Device for solidifying and preparing microcapsules through temperature control

Technical field of a device for preparing microcapsules through temperature control curing

[0001] The present invention belongs to the field of food machinery, and relates to a device for preparing microcapsules through temperature-controlled solidification.

technical background

[0002] A microcapsule is a miniature container or package with a polymer wall shell, and the core material is loaded inside. Microcapsule technology has so far made good progress in different fields including medicine, pesticide science, perfumery, paint science, food science, and cosmetic preparation. The core material can well preserve its characteristics after microencapsulation, such as its color, shape, heat resistance, solubility, volume, quality, etc. will be preserved. Microencapsulation technology is also widely used in foods. It can be used for sweeteners, sour agents, flavors and fragrances, preservatives, sweeteners, leavening agents, antioxidants, powdered oils, micro-encapsulated microorganisms, etc.; some unstable Ingredients can use this technology to increase their stability.

[0003] The methods for preparing microcapsules are usually divided into chemical methods and physical methods. Chemical methods generally include interfacial polymerization method, orifice coagulation bath method, emulsion polymerization method, in-situ polymerization method, etc.; physical methods include spray method, air suspension method, pot method, inclusion compounding method, etc.; physical chemical method includes complex aggregation Method, oil phase separation method, single coagulation method, dry bath method (multiphase emulsification method), melting dispersion condensation method, etc. Regarding the melting dispersion condensation method, also known as the spray cooling method, this method is developed from the spray drying method. Its operation process is similar to that of the spray drying method, except that the method is to rapidly cool and solidify the heated and melted wall material. Typical wall materials for this method include hydrogenated vegetable oils, fatty acid esters, fatty alcohols, mono- and diglycerides and the like. For example, Duan Chengjin and others use the melting, dispersion and condensation method to prepare high-cold water resin microcapsules, by heating and melting paraffin, and then adding a certain amount of superabsorbent resin powder, and then mixing with a mixer at high speed to homogenize and emulsify, and then spray and disperse. After cooling, a microcapsule product is obtained. Jing Legang et al. used the spray cooling method to prepare multivitamin microcapsules. The vitamin Bi, vitamin B6, and nicotinamide were dissolved in water and mixed to form a core material solution. After polyglycerol monostearate was dissolved in water, the temperature was heated at 57°C. It is heated and stirred in a water bath to make it evenly dispersed to form a wall material solution, then the wall material solution and the core material solution are mixed and emulsified, after spray cooling and centrifugal separation, a multivitamin microcapsule is obtained. However, due to the low melting point of the wall material used in this method, the microcapsules are easy to use and store during use and storage. The wall breaks when exposed to heat, so it is very necessary to coat the microcapsules prepared by the melt dispersion condensation method twice.

[0004] However, there is currently no technology for secondary coating of microcapsules prepared by melting, dispersion and condensation, with solid fat as the wall material. Generally, there are two main secondary coating techniques: one is to spray monolayer microcapsules into the coating solution, then stand and separate. However, this method is difficult to obtain dry powder, and it is easy to cause wall breakage during the separation and drying process. The second is to use fluidized bed technology, but this technology usually has a higher temperature, and it is also easy to cause fat wall breakage.

[0005] In the present invention, the double-layer embedding is placed in the same coating reaction chamber, by controlling the temperature of the fat, the fat is first liquefied and then solidified, and then the second layer of coating is controlled by controlling the atomization pressure and the solubility of the coating liquid. The thickness of the outer shell of the coat is used to obtain double-layer microcapsules. The invention has simple preparation process, simple experimental equipment, mild reaction conditions, and easy control. The defects of the melt-dispersion-condensation method for preparing microcapsules are better solved, and the double-layer shell can be effectively prepared. Microcapsules.

Summary of the invention

[0006] The object of the present invention is to provide a device for preparing microcapsules through temperature-controlled curing. The device can be used to prepare microcapsules, especially when materials that are easily changed by temperature are used as wall materials.

[0007] The present invention is achieved through the following technical solutions.

[0008] The device of the present invention for preparing microcapsules through temperature control solidification includes a core material liquid inlet (1), a wall material liquid inlet (2), a vibration system (3), and a peristaltic pump 1 (4). ), heater (5), concentric heating nozzle (6), electrode (7), coating reaction chamber (8), air inlet (9), coating liquid inlet (10), peristaltic pump R (11) ), atomizing nozzle (12), temperature control system (13), air compressor (14), screen (15), valve switch (16).

[0009] The core material inlet (1) is located on the left side above the coating reaction chamber (8), the core material inlet (1) is connected to the left side of the vibration system (3), and the wall material inlet is connected to the peristaltic On the right side of pump I (4), there is a heater (5) under the wall solution, and the peristaltic pump I (4) is connected to the vibration system (3) on the right side. The vibration system (3) is located at the top of the coating reaction chamber (8) , The concentric heating nozzle (6) is connected below the vibration system (3), the electrode (7) is located below the concentric heating nozzle (6), the screen (15) is located at the bottom of the coating reaction chamber (8), and three atomizing nozzles ( 12) Located below the electrode (7), distributed in a triangle on a section, the coating liquid inlet (10) is connected to the right side of the peristaltic pump R (11), and the left side of the peristaltic pump R (11) is connected to three mists The lower end of the atomizing nozzle (12) and the upper end of the atomizing nozzle (12) are connected to the temperature control system (13). The air inlet (9) is located at the bottom of the coating reaction chamber (8). One end is connected to the screen (15) and the other end is connected The temperature control system (13) is connected to the air compressor (14) on the right side of the temperature control system (13), and the valve (16) is located at the bottom of the coating reaction chamber above the screen (15). The inlet pressure of the air inlet (9) and the atomizing nozzle (12) is provided by an air compressor (14).

[0010] The wall material solution transmits the fat heated to a certain temperature by the heater (5) to the vibration system (3) through the peristaltic pump 1 (4), and enters the vibration system (3) at the same time as the core material liquid. The vibration system (3) ) Through intermittent extrusion, the core material and the wall material are respectively passed through the inner diameter and outer diameter of the concentric heating nozzle (6) to form micro droplets. These micro-droplets flow through the electric field between the electrodes (7), causing the surface to be charged, and the electrostatic repulsive force disperses them. During the dripping process, they enter through the air inlet (9) under the coating reaction chamber (8). The cold air cools and solidifies the micro-droplets into microspheres. The microspheres are blown up to form a fluidized state by adjusting the air intake speed. The coating liquid inlet (10) is used to transport the coating liquid through the peristaltic pump R (11) To the three atomizing nozzles (12) below the electrode in the coating reaction chamber (8), the positions of the three atomizing nozzles (12) form a triangular distribution. The coating liquid is atomized and meets the fluidized microspheres. Thereby forming a secondary coating. The prepared double-layer microcapsules finally fall on the screen (15), the valve switch (16) is turned on, and the prepared double-layer microcapsules are taken out.

[0011] The technical effect of the present invention is: by controlling the temperature of the fat in different states at different temperatures, the fat is first liquefied and then solidified to prepare a single-layer microcapsule, and then the second layer is controlled by controlling the atomization pressure and the solubility of the coating liquid The thickness of the outer shell of the coating yields double-layer microcapsules. The invention has simple preparation process, simple experimental equipment, mild reaction conditions, and easy control. It can better solve the defects of preparing microcapsules by melting, dispersion and condensation, and can effectively prepare double-layer microcapsules. Shell microcapsules.

Description of the drawings

[0012] Figure 1 is a schematic diagram of the structure of the present invention. Among them, 1 is the core material inlet, 2 is the wall material inlet, 3 is the vibration system, 4 is the peristaltic pump 1, 5 is the heater, 6 is the concentric heating nozzle, 7 is the electrode, and 8 is the coating reaction chamber. 9 is the air inlet, 10 is the coating liquid inlet, 11 is the peristaltic pump Π, 12 is the atomizing nozzle, 13 is the temperature control system, 14 is the air compressor, 15 is the screen, and 16 is the valve switch.

Detailed ways

[0013] The present invention will be further illustrated by the description of the drawings and the following embodiments.

[0014] Example 1.

[0015] The device for preparing microcapsules through temperature-controlled solidification described in this embodiment includes a core material liquid inlet 1, a wall material liquid inlet 2, a vibration system 3, a peristaltic pump 14, a heater 5, and concentric heating Nozzle 6, electrode 7, coating reaction chamber 8, air inlet 9, coating liquid inlet 10, peristaltic pump R11, atomizing nozzle 12, temperature control system 13, air compressor 14, screen 15, valve switch 16.

[0016] The core material inlet 1 is located on the left side above the coating reaction chamber 8, the core material inlet 1 is connected to the left side of the vibration system 3, the wall material inlet is connected to the right side of the peristaltic pump 14, and the wall material solution A heater 5 is installed below, the right side of the peristaltic pump 14 is connected to the vibration system 3, which is located at the top of the coating reaction chamber 8, and the concentric heating nozzle 6 is connected below the vibration system 3, and the electrode 7 is located below the concentric heating nozzle 6. The net 15 is located at the bottom of the coating reaction chamber 8, and the three atomizing nozzles 12 are located below the electrode 7 and are distributed in a triangle on a cross section. The coating liquid inlet 10 is connected to the right side of the peristaltic pump Π 11 and the left side of the peristaltic pump Π 11 Three atomizing nozzles 12 are connected to the lower end of the side, the upper end of the atomizing nozzle 12 is connected to the temperature control system 13, the air inlet 9 is located at the bottom of the coating reaction chamber 8, one end is connected to the screen 15, and the end is connected to the temperature control system 13. The air compressor 14 is connected to the right side of the temperature control system 13, and the valve 16 is located at the bottom of the coating reaction chamber 8, above the screen 15. The inlet pressure of the air inlet 9 and the atomizing nozzle 12 is provided by the air compressor 14.

[0017] The wall material solution transmits the fat heated to a certain temperature by the heater 5 to the vibration system 3 through the peristaltic pump 14, and enters the vibration system 3 at the same time as the core material liquid. The vibration system 3 makes the core material and the The wall materials respectively pass through the inner diameter and outer diameter of the concentric heating nozzle 6 to form micro droplets. These micro-droplets flow through the electric field between the electrodes 7, causing their surface to be charged, and the electrostatic repulsion makes them dispersed. In the process of dropping, the cold air entering through the air inlet 9 under the coating reaction chamber 8 removes the micro-liquid The drops are cooled and solidified into microspheres, and the microspheres are blown up by adjusting the air inlet speed to form a fluidized state.The coating liquid inlet 10 is transported to the coating reaction chamber 8 under the electrode through the peristaltic pump R11. There are three atomizing nozzles 12, and the positions of the three atomizing nozzles 12 form a triangular distribution. The coating liquid is atomized and meets the fluidized microspheres to form a secondary coating. The prepared double-layer microcapsules finally fall on the screen 15, the valve switch 16 is turned on, and the prepared double-layer microcapsules are taken out.

[0018] Example 2.

[0019] Take 0.5% of 100ml curcumin solution from the liquid inlet 1, take 200g of fat heated by a heater into a liquid state, and transport the fat to the vibrating system via a peristaltic pump, and indirectly squeeze through the vibrating system, Uni-core single-wall micro-condensed beads are generated through concentric nozzles, which are dispersed into the coating reaction chamber after passing through the electrode. The cold air entering through the air inlet below the coating reaction chamber will micro-coagulate the curcumin-coated fat wall The gel is solidified, and then the microgel is blown up to fluidize it. The coating liquid syrup is simultaneously transported to three atomizing nozzles by a peristaltic pump. The atomized coating liquid meets the solidified microgel, thereby forming The secondary coating produces double-layer microcapsules, which are cured after being blown by cold air. After the production is over, the valve is opened and collected, and the syrup-fat double-wall curcumin microcapsules with an average particle size of 230 wn, a smooth surface and a round shape are obtained.