Wear-resistant non-stick ceramic coating material as well as preparation method and application thereof and die-cutting tool

A wear-resistant non-stick ceramic coating material and its preparation method, use and die-cutting tool technical field

The invention belongs to the field of special coating materials, particularly a kind of wear-resistant, non-stick ceramic coating formed by chemical method coating, the method for preparing the ceramic coating and the coating coated by this coating The high-precision die-cutting tool also relates to the use of the high-precision die-cutting tool in the fields of optics, electronics and other precision die-cutting fields, and particularly relates to the soft and high-viscosity OCA optical glue die-cutting.

Background technique

The primary product of the current electronic display film material is mainly a coiled material, all need to be die-cut according to the shape designed by the terminal customer before being applied to the terminal module, so that the shape of the film material and the shape of the terminal module are made. match. Die-cutting is a very important link, and the quality of die-cutting directly affects the quality and yield of the final product. Electronic display film materials usually consist of a three-layer structure: bottom protective film, functional film or adhesive film, and face protective film. When die-cutting, the die-cutting knife is required to cut through the face protective film and the functional film or adhesive film, but not. Destroying the bottom protective film, this die-cutting technique is called "precision die-cutting". In the process of precise film cutting, the functional layer of electronic display film materials is adhesive film, especially the adhesive film is soft and very sticky (such as die-cutting OCA optical adhesive for display bonding, common such as 3M 2804, 3M 2806, 3M 3004 and other models with better filling performance), the knife sticking phenomenon often occurs during the die-cutting process. On the one hand, the die-cutting production process will gradually accumulate residual glue on the blade. The edge of the die-cutting product will be brought up, and the waste cannot be discharged; on the other hand, the material of the die-cutting film will be deformed and its size will change and become waste.

[0003] Therefore, improving the adhesion performance of die-cutting tools has always been the pursuit of unremitting efforts in the industry. Improving the adhesion of materials is often achieved through functional coating treatments, with fluoropolymer coatings being the most common method. Fluoropolymers have been widely used in non-stick products for their high temperature resistance, super weather resistance, corrosion resistance, superior self-cleaning performance, chemical inertness and extremely low surface energy, such as non-stick pans, high temperature resistance on aluminum or steel. Among the current fluoropolymers, polytetrafluoroethylene (PTFE) is most commonly used as the main component of the coating agent. US 2008061068A1 discloses a cooking utensil with a metal carrier coated with Teflon. The coating contains fluorocarbon resin and inorganic compounds, so that the cooking utensil has good non-stick properties. US7635522B2 discloses a sol-gel coating composition containing fluoropolymer particles. The fluoropolymer particles are uniformly distributed in the coating, so that the coated product has good anti-sticking properties. CN105563557A uses a spraying process to treat the surface of the tool with fluoropolymer, and utilizes the low surface energy characteristic of the fluoropolymer to reduce the adhesion performance. Although PTFE has good long-term non-stick properties, PTFE-containing non-stick coatings have insufficient scratch resistance, and the coated knives are not sharp enough, have low wear resistance, and have a short service life.

[0004] Against this background, numerous attempts have been made in the past to produce high performance nonstick coatings using PTFE-free materials and processes. DE19714949A1 describes an abrasion-resistant vitreous coating composition which is produced by the silane RSi(OR')₃, Nanoscale SiO₂Hydrolysis and condensation of particles, alkali metal and alkaline earth metal hydroxides followed by dense films at temperatures greater than 400°C. EP1835002A2 discloses a two-layer non-stick coating in which the first so-called base layer consists of a matrix of the condensation product of silica sol and an organoalkoxysilane, on which the top layer of the matrix consists of applying a silica sol and an organoalkoxysilane. Condensation product of a mixture of oxysilanes and fluoroalkoxysilanes. The coatings in the examples described all have insufficient non-stick effect and cannot be applied to high-precision die-cutting of tools.

Therefore, the development of novel high hardness, high wear-resistant low surface energy ceramic coating materials to overcome the existing coating defects

significant.

SUMMARY OF THE INVENTION

An object of the present invention is to provide a coating material with high hardness (wear resistance) and good non-stick properties, and thus the coating material is coated on the surface of high-precision cutting tools, and the coating has improved non-stick properties of cutting tools. The non-stick coating is more wear-resistant, the coating will not peel or peel off, the blade profile of the tool maintains the original precision, and the tool is easy to clean; another object of the present invention is to provide this kind of excellent A tool with high die-cutting capability can be used for die-cutting of soft and sticky film materials.

For solving the technical problems existing in the prior art, an embodiment of the present invention adopts the following technical solutions:

[0008] First of all, the present invention provides a wear-resistant non-stick ceramic coating material with high hardness and good non-stick properties. The coating material is composed of two continuous layers of different compositions, wherein:

(1) first layer, also referred to as inner layer, bottom layer, the material composition of first layer is mainly nano-silica; Preferably, the content of nano-silica is 95wt%~100wt%; (2) ) second layer, also referred to as outer layer, upper layer, the material composition of second layer is mainly hydrophobic silica; Preferably, the content of hydrophobic silica is 95wt%~100wt%.

One of the embodiments of the present invention is that the wear-resistant non-stick ceramic coating material consists of two continuous layers, wherein the first layer of coating is 100wt% nano-silica, and the second layer of coating contains 95wt% ~100wt% hydrophobic silica.

[0011] The first layer of the coating material is applied to the base material and tightly combined with the base material, the base material includes but not limited to cutting tools, the cutting tools include but are not limited to die-cutting knives, and the die-cutting knives can at least be made of steel or alloy; A second layer of coating material is applied over the first layer to form a tight bond with the first layer.

The thickness of the first layer is 10-60nm, and the thickness is too low to affect the bonding firmness with the second layer, thereby causing the wear resistance of the tool to be low, and the thickness is too large to affect the precision of die cutting, so the first The thickness of the layer is preferably 15-40nm, more preferably the thickness of the first layer is 20-30nm, according to one embodiment of the present invention, the thickness of the first layer is 10nm; according to another embodiment of the present invention, the first layer The thickness of the layer is 20 nm.

The thickness of the second layer is 20-100nm, and the thickness is too low and can affect non-stick performance, and the thickness is too large and can affect the precision of die cutting, so the preferred thickness of the second layer is 30-80nm, more preferably the thickness of the second layer is 30-80nm. The thickness is 40-60 nm, and according to an embodiment of the present invention, the thickness of the second layer is 45 nm.

[0014] The method of applying a silicon dioxide coating on a substrate includes, but is not limited to, vacuum evaporation, magnetron sputtering, plasma chemical deposition (PECVD), sol-gel method, and the like.

Vacuum evaporation: take silicon dioxide as raw material, place it in the evaporation container of vapor deposition machine, heat silicon dioxide raw material by electron gun, make silicon dioxide molecules escape, form vapor flow, be incident on base material Such as the surface of the tool, condensation forms a solid film.

Magnetron sputtering: take high-purity silicon (purity W99.999%) as target material, high-purity nitrogen gas as sputtering gas, and high-purity oxygen as reactive gas to carry out compound sputtering, work during control sputtering pressure, sputtering power and sputtering time to obtain the thickness of the final coating.

Adopt plasma chemical deposition method with silicon tetrahydride and nitrous oxide as deposition source, react under plasma action and be deposited to target object (substrate) surface, the chemical reaction of preparing silicon dioxide film is as follows:

SiH₄+2N₂O = SiO₂+2N₂+2H₂；

[0019] Due to the addition of the required deposit SiO in the reactants₂In addition to being solid, the rest are gaseous. The advantage of the obtained deposit is that it has less particles and better post-film uniformity and repeatability. It is the most commonly used type of dioxide in microelectronics technology.

Silicon deposition source, widely used in the semiconductor industry.

Sol-gel method as can adopt ethyl orthosilicate, dehydrated alcohol as raw material, catalyze with hydrochloric acid, form SiO by hydrolysis, polycondensation process₂The gel is then dried and sintered.

[0021] The second layer of coating material (hydrophobic silica) is applied on the surface of the substrate to form a ceramic polymer network on the surface of the first layer by hydrolysis and condensation of organosilanes with organoalkoxysilanes . The organoalkoxysilane is preferably a hydroxyl-terminated polydialkyl(aryl) siloxane, and the hydroxyl-terminated polydialkyl(aryl) siloxane includes hydroxyl-terminated polydialkylsiloxane and hydroxyl-terminated polydiaryl siloxane Siloxane. Because the hydroxyl-terminated polydialkyl(aryl)siloxane has alkyl or aryl groups, the ceramic polymer network has high hydrophobicity. The terminal hydroxyl groups of the hydroxyl-terminated polydialkyl(aryl)siloxane can be incorporated into the polymer network through condensation to stabilize the ceramic polymer network structure. The hydrophobic second layer is bonded to the surface of the first layer and acts as a non-stick. Therefore, the second layer of coating material applied on the substrate should include at least the following raw materials: organosilane, organoalkoxysilane, catalyst, solvent.

Preferably, the second layer of hydrophobic silica is obtained by the sol-gel method, and the organosilane and organoalkoxysilane participating in the sol-gel reaction can be called as precursor, and the sol-gel The process of preparing hydrophobic silica by the method is the process of obtaining hydrophobic silica by the hydrolysis and polycondensation of the precursor. More specifically, the precursor comprises two parts: a gelation reaction host organosilane (using the structural formula R1SiX₃expression) and reactive hydrophobic polymeric organoalkoxysilanes (using the structural formula HO-[Si (R²) 2] nOH expression). In the precursor, the content of the main body of the gelation reaction R1SiX is 9099wt%, the reactive hydrophobic polymer HO-[Si(R)²) 2] _nThe content of OH is 1-10 wt %. During the hydrolysis and polycondensation of the precursor, catalysts and solvents are also required.

Wherein, gelation reaction main body R1SiX₃The group X is a hydrolyzable group or a hydroxyl group, and the group R¹is an alkyl, aryl or fluoroalkyl group having 1-6 carbon atoms; the hydrolyzable group is an alkoxy group.

Preferably, described gelation reaction main body RISiX₃It can be an organosilane, such as one or more combinations of methyltrimethyloxysilane, methyltriethoxysilane, phenyltrimethoxysilane, and perfluorooctyltriethoxysilane, In addition, in the gelation reaction host RlSiX₃One or more compositions of tetramethoxysilane, tetraethoxysilane and the like can also be added to the tetramethoxysilane in an amount of not more than 5wt%.

Preferably, reactive hydrophobic polymer HO-[Si(R²)₂]_n-OH group R²It is one of alkyl groups or aryl groups such as methyl, ethyl, propyl, butyl, phenyl, etc., wherein n represents a number between 2 and 300, such as n is 10, 20, 50, 100, 150, 200, 250, 280, 300 and other numbers.

Described reactive hydrophobic polymer HO-[Si (R²) ₂]_n-OH is preferably one or a combination of polydimethiconol (PDMS), polydiethylsiliconol, and polydiphenylsiliconol.

The hydrolysis reaction general formula of gelation reaction main body R1% is:

R¹-Si (OR³) ₃+3H₂0TR^Si (OH) 3+3R3OH;

[0029] The hydroxyl group formed by hydrolysis reacts with itself, free silica particles or the surface of the inner silica in a condensation reaction to form a very strong Si-O-Si bond. group R¹No hydrolysis. R³It is one of the groups such as methyl, ethyl, propyl, butyl, and phenyl. The product of the hydrolysis reaction and the reactive hydrophobic polymer HO-[Si(R²)₂1_n The general formula of the condensation reaction of OH is:

-Si-OH+HO-Si~T~Si-O-Si~+H₂O;

~Si-OR³+HO-Si^^->~Si-O-Si~+R³OH;

Catalyst is acid catalyst, and described acid catalyst is carboxylic acid or inorganic acid, and carboxylic acid refers to the carboxylic acid with 1 to 4 carbon atoms, such as acid catalyst is acetic acid (being acetic acid), formic acid, propionic acid, One of the oxalic acids such as oxalic acid or

several compositions; or the acidic catalyst is one or several compositions of inorganic acids such as hydrochloric acid, nitric acid, phosphoric acid, and sulfuric acid. Carboxylic or mineral acids often act as catalysts in hydrolysis and condensation reactions and prevent too slow crosslinking.

Solvent is organic solvent, or the mixed solvent that organic solvent and water form. The organic solvent is a lower alcohol, especially an alcohol with 1 to 6 carbon atoms, including conventional alcohols such as ethanol, n-propanol, isopropanol, n-butanol, n-amyl alcohol, and these lower alcohols have certain properties. Ester-soluble, but also some water-soluble.

The second layer is a non-stick layer, and as required, the second layer of hydrophobic silica non-stick layer can also contain 0-5wt% nano-filler, preferably the second layer of hydrophobic silica non-stick layer contains 0.1 wt% - 3wt% of nanofillers. The nano-filler is selected from one or more compositions of nano-fillers such as silicon carbide, aluminum oxide, boron carbide, etc. The particle size of the nano-filler is not greater than 15 nm, preferably, the particle size of the nano-filler is 2-10 nm, Too large a particle size of the nanofiller will cause uneven thickness of the coating, affecting the sharpness of the tool and the die-cutting performance. Preferably, the nano-filler is made into a sol, that is, a nano-wear-resistant sol, and then dispersed into the hydrophobic precursor system to enhance the wear-resistant performance of the second-layer coating material.

[0035] The above-mentioned wear-resistant non-stick ceramic coating material can be used as a die-cutting tool surface coating. The present invention also provides a specific preparation method for coating the above-mentioned cutting tool with wear-resistant and non-stick ceramic coating material on the surface, comprising the following steps:

(1) inner layer coating: adopt the combination of one or more in the cleaning methods such as ultrasonic washing, ethanol cleaning, acetone cleaning, after washing off all possible inorganic dirt and organic dirt on the tool surface, put A layer of silicon dioxide inner layer with a thickness of 10-60nm is coated in the coating machine to obtain a pre-processed tool and placed in a clean environment for storage for later use; the coating thickness of the silicon dioxide inner layer can be set by the built-in parameters of the coating machine , the thickness of the silicon dioxide inner layer is preferably 15-40nm;

(2) preparation reaction solution: 1 part of gelation reaction main body organosilane, 0.0001-0.1 part of acid catalyst, 0.01-0.1 part of reactive hydrophobic polymer, 1-10 part of solvent n-butanol, 0.25-3 part of water , 0-0.05 part of nano wear-resistant sol is poured into the beaker and stirred evenly; the "part" refers to the mass part;

(3) Growth outer layer: the cutting tool processed by step (1) is immersed in the reaction solution in step (2), and (preferably room temperature) is kept for 1-6h between 20-30 °C; after the siloxane in the reaction solution is hydrolyzed Polycondensation is performed on the surface of the tool to form a film; preferably, the tool is immersed in the reaction solution and kept at room temperature for 3-6h;

(4) Take out the cutter after step (3) finishes, be placed in the oven of 40-90 °C and dry, then put into the muffle furnace of 350-450 °C and sinter for 15-25min, take out after sintering, and obtain the finished cutter. The sintering process can be done under the protection of inert gas.

The present invention is to carry out silicon dioxide coating pretreatment by adopting physical or chemical deposition technology to the tool surface, so that a layer of tight silicon dioxide bottom layer is formed on the surface, and then the surface of the silicon dioxide inner layer is formed by the method of chemical deposition. An outer layer is grown, which has good hydrophobicity and high wear resistance. The inner silica layer mainly acts as a "nanocrystal nucleus", inducing the outer hydrophobic silica layer to grow densely on the inner silica surface by the sol-gel method, and the outer layer is mainly composed of alkyl groups. Or silica with hydrophobic functional groups such as aryl groups, and nanofillers.

[0041] The tool with the wear-resistant non-stick ceramic coating material on the surface can be used as a high-precision die-cutting tool in the fields of precision die-cutting such as optics and electronics, and is especially suitable for the die-cutting field of soft and high-viscosity OCA optical adhesives.

Compared with prior art, the present invention does not rely on traditional tetrafluoro coating, just can make the coating on the surface of the substrate obtain better anti-sticking effect, higher coating hardness, coating and substrate The bonding fastness is large, the degree of wear resistance is good, and the coating construction treatment is relatively simple, the coating is thin, and the addition of the coating does not affect the original die-cutting accuracy of the substrate (such as the tool). There is no residual glue, glue pulling and other phenomena, which can greatly improve the die-cutting yield.

Description of drawings

Fig. 1 is the schematic diagram of die-cutting tool structure, and Fig. 2 is the sectional schematic diagram of coating cutting edge; In the figure, each serial number represents: 1, shaft body; 2, blade body; 3, cutting edge; 4, hydrophobic silicon dioxide layer; 5. Nano silica layer; 6. Cutting edge section.

Detailed ways

[0044] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

The die-cutting tool structure is shown in Figure 1, and the cutting edge of the tool is shown in Figure 2. When coating, the blade body and the cutting edge can be coated simultaneously or only the cutting edge of the tool can be coated. The shaft body 1 is the rotating shaft of the blade body 2, the blade body 2 is cylindrical, there are two annular cutting edges 3 on the blade body 2, the cutting edge section 6 is a triangle, and the two cutting edges are arranged on the blade body 2, between the two cutting edges. For the die-cutting width, the surface of the blade has a nano-silica layer 5 and a hydrophobic silica layer 4 . The blade turns to die-cut the material beneath it.

Embodiment 1

Adopt ultrasonic washing, ethanol cleaning and acetone cleaning successively, clean all possible inorganic dirt and organic dirt that exist on the tool surface, then put into the silicon dioxide inner layer of coating thickness 10nm in coating machine, obtain the pretreatment tool , placed in an environment with a cleanliness level of 100 and stored for later use.

With methyltrimethoxysilane 100g, acetic acid 0.05g, hydroxyl-terminated PDMS aqueous solution (concentration 63wt%, PDMS molecular weight is 2000) 10g, n-butanol 300g and water 100g were stirred in a 1000mL beaker to obtain a mixed solution . Immerse the pretreatment tool in the mixed solution to coat the outer layer, take out the tool after keeping it at room temperature for 2 hours, dry it in an oven at 80°C for 20min, and then place it in a muffle furnace at 400°C under nitrogen protection atmosphere for thermal sintering 20min, cool down, take out the tool and test the coating thickness, and then assemble the round-knife tool on the round-knife die-cutting machine for comprehensive performance evaluation.

Embodiment 2

Adopt ultrasonic washing, ethanol cleaning and acetone cleaning successively, clean out all possible inorganic dirt and organic dirt on tool surface, then put into the silicon dioxide inner layer of vapor deposition thickness 10nm in vapor deposition machine, obtain pre- Dispose of knives and place them in a 100-class cleanliness environment for later use.

100g of methyltrimethoxysilane, 0.05g of acetic acid, hydroxyl-terminated PDMS aqueous solution (concentration 63wt%, PDMS molecular weight is 2000) 10g, n-butanol 300g and water 100g were stirred in a 1000mL beaker to obtain a mixed solution . Immerse the pretreatment tool in the mixed solution to coat the outer layer, take out the tool after keeping it at room temperature for 4 hours, dry it in an oven at 80°C for 20min, and then place it in a muffle furnace at 400°C under nitrogen protection atmosphere for thermal sintering 20min, cool down, take out the tool and test the coating thickness, and then assemble the round-knife tool on the round-knife die-cutting machine for comprehensive performance evaluation.

Embodiment 3

Adopt ultrasonic washing, ethanol cleaning and acetone cleaning successively, clean out all possible inorganic dirt and organic dirt on cutter surface, then put into the silicon dioxide inner layer of coating thickness 10nm in coating machine, obtain pretreatment cutter , placed in an environment with a cleanliness level of 100 and stored for later use.

100g of methyltrimethoxysilane, 0.05g of acetic acid, hydroxyl-terminated PDMS aqueous solution (concentration 63wt%, PDMS molecular weight is 2000) 10g, n-butanol 300g and water 100g were stirred in a 1000mL beaker to obtain a mixed solution . All the pretreatment tools were immersed in the mixed solution to coat the outer layer, kept at room temperature for 6 hours and then taken out, dried in an oven at 80°C for 20min, and then placed in a muffle furnace at 400°C under nitrogen protection atmosphere for thermal sintering 20min, cool down, take out the tool and test the coating thickness, and then assemble the round-knife tool on the round-knife die-cutting machine for comprehensive performance evaluation.

Embodiment 4

Adopt ultrasonic washing, ethanol cleaning and acetone cleaning successively, clean off all possible inorganic dirt and organic dirt on cutter surface, then put into the silicon dioxide inner layer of coating thickness 20nm in coating machine, obtain pretreatment cutter , placed in an environment with a cleanliness level of 100 and stored for later use.

100g of methyltrimethoxysilane, 0.05g of acetic acid, hydroxy-terminated PDMS aqueous solution (concentration 63wt%, PDMS molecular weight is 2000) 10g, n-butanol 300g and water 100g were stirred in a 1000mL beaker to obtain a mixed solution . Immerse the pretreatment tool in the mixed solution to coat the outer layer, take out the tool after keeping it at room temperature for 4 hours, dry it in an oven at 80°C for 20min, and then place it in a muffle furnace at 400°C under nitrogen protection atmosphere for thermal sintering 20min, cool down, take out the tool and test the coating thickness, and then assemble the round-knife tool on the round-knife die-cutting machine for comprehensive performance evaluation.

Embodiment 5

Adopt ultrasonic washing, ethanol cleaning and acetone cleaning successively, clean off all possible inorganic dirt and organic dirt on cutter surface, then put into the silicon dioxide inner layer of coating thickness 20nm in coating machine, obtain pretreatment cutter , placed in an environment with a cleanliness level of 100 and stored for later use.

100g of methyltrimethoxysilane, 0.05g of acetic acid, hydroxyl-terminated PDMS aqueous solution (concentration 63wt%, PDMS molecular weight is 2000) 10g, n-butanol 300g and water 100g were stirred in a 1000mL beaker to obtain a mixed solution . All the pretreatment tools were immersed in the mixed solution to coat the outer layer, kept at room temperature for 6 hours and then taken out, dried in an oven at 80°C for 20min, and then placed in a muffle furnace at 400°C under nitrogen protection atmosphere for thermal sintering 20min, cool down, take out the tool and test the coating thickness, and then assemble the round-knife tool on the round-knife die-cutting machine for comprehensive performance evaluation.

Embodiment 6

Adopt ultrasonic washing, ethanol cleaning and acetone cleaning successively, clean all possible inorganic dirt and organic dirt that exist on cutter surface, then put into the silicon dioxide inner layer of coating thickness 40nm in coating machine, obtain pretreatment cutter , placed in an environment with a cleanliness level of 100 and stored for later use.

Methyltrimethoxysilane 100g, acetic acid 0.05g, hydroxyl terminated polydiphenylsiloxane aqueous solution (concentration 50wt%, molecular weight is 1000) 6g, n-butanol 300g and water 100g were stirred in a 1000mL beaker uniform to obtain a mixed solution. All the pretreatment tools were immersed in the mixed solution to coat the outer layer, kept at room temperature for 6 hours and then taken out, dried in an oven at 80°C for 20min, and then placed in a muffle furnace at 400°C under nitrogen protection atmosphere for thermal sintering 20min, cool down, take out the tool and test the coating thickness, and then assemble the round-knife tool on the round-knife die-cutting machine for comprehensive performance evaluation.

Embodiment 7

Adopt ultrasonic washing, ethanol cleaning and acetone cleaning successively, clean out all possible inorganic dirt and organic dirt on cutter surface, then put into the silicon dioxide inner layer of coating thickness 20nm in coating machine, obtain pretreatment cutter , placed in a 100-level clean environment for preservation.

100g of methyltrimethoxysilane, 0.05g of acetic acid, hydroxy-terminated PDMS aqueous solution (concentration 63wt%, PDMS molecular weight is 2000) 10g, n-butanol 500g, water 150g, particle diameter 3~5nm acidic nano alumina 5g of sol (pH = 4, solid content 20%) was stirred evenly in a 1000mL beaker to obtain a mixed solution. Immerse all the pretreated tools in the mixed solution to coat the second layer. After keeping the tool at room temperature for 4 hours, take out the tool, dry it in an oven at 80°C for 20min, and then place it in a muffle furnace at 400°C under nitrogen protection atmosphere. After sintering for 20min, cooled, the tool was taken out and the coating thickness was tested, and then the round-knife tool was assembled on a round-knife die-cutting machine for comprehensive performance evaluation.

Comparative example 1

The PDMS aqueous solution (concentration 63wt% molecule of methyltrimethoxysilane 100g, acetic acid 0.05g, hydroxyl end-capped)

The amount is 2000) 10g, 300g of n-butanol and 100g of water are stirred evenly in a 1000mL beaker to obtain a mixed solution. Ultrasonic washing, ethanol washing and acetone washing are successively used to remove all possible inorganic dirt and organic dirt on the surface of the tool to obtain a pretreated tool. All the pretreatment tools were immersed in the mixed solution for plating, kept at room temperature for 6 hours, taken out, dried in an oven at 80°C for 20min, and then placed in a muffle furnace at 400°C under nitrogen protection atmosphere for thermal sintering 20min, cool down, take out the tool and conduct coating thickness test, and then assemble the round knife tool on the round knife die-cutting machine for comprehensive performance evaluation.

Comparative example 2

Adopt ultrasonic washing, ethanol cleaning and acetone cleaning successively, clean out all possible inorganic dirt and organic dirt that exist on the tool surface, then put into coating machine, and the polytetrafluoroethylene non-stick coating that plating thickness is 55nm, The processed round-knife cutters were assembled on a round-knife die-cutting machine for comprehensive performance evaluation.

To the tool detection hardness, wear resistance, non-stick performance, die-cutting performance of embodiment 1 to embodiment 7, comparative example 1 and comparative example 2, the detection method of each performance is as follows:

Coating thickness: according to JJF 1306-2011 " X-ray fluorescence coating thickness gauge calibration specification " detection method, adopt X-ray fluorescence coating thickness gauge to test and test the first layer and the total coating after the second layer is plated Thickness, where the thickness of the second layer is obtained by subtracting the thickness of the first layer from the total coating thickness.

Coating hardness: according to " GB/T 6739-1996 coating film hardness pencil determination method " method, by adjusting the pencil model of different hardness, coating is scratched.

Wear resistance: determine by the number of times of cutter die-cutting material (sheet material is selected as 3M 2806OCA), the number of times of die-cutting when sticking to the knife or the phenomenon of precision decline is lower than 10,000 and recorded as poor, and 10,000~20,000 The record was good, and more than 20,000 pieces were recorded as excellent.

Die-cutting performance: determine the accuracy of die-cutting soft sheet material (sheet material is selected as 3M 2806OCA) by tool, specifically for every die-cutting 1000 pieces of samples, there is a deformation record with a die-cutting tolerance greater than ±0.05mm It is bad, otherwise it is recorded as excellent.

Non-stick performance: determine by the sticking knife phenomenon of die-cutting soft sheet material (sheet material is selected as 3M 2806OCA), be specially every die-cut 100 pieces of samples, occur 1 sticking knife phenomenon and remember badly, do not appear sticking Knife phenomenon was recorded as excellent.

Detection result is as shown in Table 1.

Table 1 performance detection data

[0079]

<td>serial number</td><td>Inner layer silicon dioxide thickness (nm)</td><td>Outer layer composition and thickness (nm)</td><td>Coating hardness</td><td>Wear resistance</td><td>non-stick properties</td><td>Die cutting performance</td>

<td>Example 1</td><td>10</td><td>hydrophobic silica, 23</td><td>9H</td><td>good</td><td>Difference</td><td>Difference</td>

<td>Example 2</td><td>10</td><td>Hydrophobic silica, 45</td><td>9H</td><td>good</td><td>excellent</td><td>excellent</td>

<td>Example 3</td><td>10</td><td>Hydrophobic silica, 63</td><td>9H</td><td>good</td><td>excellent</td><td>excellent</td>

<td>Example 4</td><td>20</td><td>Hydrophobic silica, 46</td><td>9H</td><td>excellent</td><td>excellent</td><td>excellent</td>

<td>Example 5</td><td>20</td><td>Hydrophobic silica, 65</td><td>9H</td><td>excellent</td><td>excellent</td><td>excellent</td>

<td>Example 6</td><td>40</td><td>Hydrophobic silica, 69</td><td>9H</td><td>excellent</td><td>excellent</td><td>excellent</td>

<td>Example 7</td><td>20</td><td>Hydrophobic silica + alumina, 45</td><td>&gt;9H</td><td>excellent</td><td>excellent</td><td>worry</td>

<td>Comparative Example 1</td><td>0</td><td>Hydrophobic silica, 68</td><td>9H</td><td>Difference</td><td>excellent</td><td>excellent</td>

<td>Comparative Example 2</td><td>0</td><td>Polytetrafluoroethylene, 55</td><td>4H</td><td>Difference</td><td>excellent</td><td>Difference</td>

Comparing the examples with the comparative examples, the present invention is a tool after the inner layer is plated with silica layer, the outer layer is plated with hydrophobic silica (or the hydrophobic silica with nano-abrasion-resistant alumina) is added. , has a series of advantages of high coating hardness, excellent wear resistance, excellent non-stick performance and die-cutting performance.

Although the present invention has been described herein with reference to illustrative embodiments thereof, it should be understood that many other modifications and embodiments can be devised by those skilled in the art that will fall within the scope of this disclosure. within the scope and spirit of the principles.