Method for producing a component and the use of said component

Translation of description of equivalent WO 0144356 A2

description

A method for producing a component, and use of the component

The invention relates to a method for producing a component made of a glass / plastic mixture. Furthermore, the invention relates to the use of the component manufactured by the method.

Used in electrical and electronic components are increasingly made of plastic materials, especially on the basis of thermoplastics. To improve the mechanical and thermal properties of the plastic mateπal a filler is added. In particular, as

Filler used glass. In order to improve the mechanical stability of Kunststoffmateπals, m the glass form of glass fibers enclosed with (glass fiber reinforced plastics) is. The glass fibers are embedded m the plastic. Increasingly Lotbadbestandigkeit is required for the components. Only in this way the components for surface mounting (SMT) are suitable. Therefore come as a thermoplastic, preferably high-temperature thermoplastics used.

A gangiges method of producing the components is the

Injection molding production. The spritzgießtechmsche production of the components causes the glass fibers are partially printed on the surface or even protrude from her. These protruding from the surface of glass fibers can the mechanical operation of the component to demolish or

Exposing more surface-near fiberglass drove. This results in a considerable wear of the components. In the event that the components are m electromechanical switches, such. As relays, used, this leads to a further disadvantage. Due to the abraded from the surface of the component glass fiber particles are the electrical contacts the relay dirty, which leads in extreme cases, failure of the relay.

The flussigkristallmen polymers preferably used as a high temperature thermoplastic (LCP) with 30 wt .-% glass fibers have a further disadvantage. Because of their typical LCP layer structure that forms in particular injection-molded parts produced with LCP components have poor tribological properties. When using fertil of these components are the aforementioned disadvantages are avoided in that an external lubricant is used. An external lubricant has the disadvantage that it is consumed with time, and that it can in turn lead to the pollution of electrical contacts.

Object of the present invention, therefore, is / plastic to provide a method for producing a component from a glass composition which has little abrasion.

This object is achieved by a method erfmdungsgemaß Claim 1. Advantageous embodiments of the invention and uses of the component according to the invention are disclosed in the further claims.

The invention provides a method of for manufacturing a

Component made of a glass / plastic mixture, it is assumed in the from of a mixture of a thermoplastic with a processing tungsstemperatur Tl and first glass particles with abgesattigten bonds at the surface. But another property of the first glass particles is that they have a glass temperature T2 <T1. The part is molded at a temperature T3> T1, whereby the first glass particles melt. From the molten first glass particles second glass particles are formed with saturable bonds at the surface. The saturable binding to the surface of the second glass particles are saturated by Anbmdung to the thermoplastic. By the inventive method for producing a component made of a glass / plastic mixture with glass particles, which have, for example, by storage in air abgesattigte bonds at the surface and the m by the low glass transition temperature new particles are reacted with saturable binding to the surface, is a very good Anbmdung the glass particles reached to the plastic matrix. This exposed glass particles or Glaspartikel- end at the surface of the component can be avoided, whereby they produce only a very small abrasion under mechanical friction. This reduced abrasion also has the advantage that no special measures to keep the air clean to be taken, for example, for filtering out fibers or fiber particles. Furthermore, there are cost savings in machinery and tools, as compared to the known glass fiber reinforced materials, the wear is drastically reduced.

The molten glass is different from the solidified glass also by the nature of their surface. While absattigen the active polar end groups of a solidified glass eg with hydroxy groups of the ambient air is always present water and thus lose their activity, are in the molten glass before the free and active end groups of, on contact with as metal or plastic, with contact metal and / or plastic surface m interaction and thereby bring about a good wetting and / or Anbmdung to this.

Is preferably used in the method for producing a component, a glass / plastic mixture, which contains: - glass as the glass particles of a low melting sulfophosphate the following composition, given m mol%:

4 to 10% Lι₂0, 4-10% Na₂0, 4-8% K₂0, 1-2% CaO, 35 to 37% of ZnO, 0 to 3% La₂0 <, 19 to 22% P₂0₅ and 19 to 22% S0₃Wherein the components together give 100%, and - as the plastic a high-performance thermoplastic.

A "niedngschmelzenden * sulfophosphate a glass is understood with low glass transition temperature T2, in particular a glass with T2 <300 ° C. Below the glass temperature is to be understood dielenige temperature at which the glass softens and thereby flowable. A "high-performance thermoplastic is a high-performance plastic (" high-performance polymer *), in the present case a hochtemperaturbestandiger plastic ( "heat-resistant polymer *," high-temperature re- sistant polymer^Λλ ). The processing temperature of the plastic Tl amounts to at least 300 ° C, because the only way the Lotbadbestan- speed of components produced from them can be ensured. The glass transition temperature T2 is below the processing temperature Tl, whereby the glass in the flowable state. Thereby, the glass / plastic mixture has very good flow properties for the production of thin-walled components or components with complicated geometry.

The glass / plastic mixtures according to the invention have good mechanical and thermal properties and good processing properties, particularly a good speed Fließfahig-, even with high filler content, ie a high glass content. They are also distinguished by an outstanding chemical bestandigkeit made, in particular to water, acids and bases, and although surprisingly without the addition of stabilizers. The glass / plastic mixtures also possess excellent abrasion resistance, and a material is recyclmg problems, since no shortening of the glass component is performed, as is the case with glass fiber reinforced blends.

The glass / plastic blends according to the invention preferably have a glass with a glass transition temperature of 250 ° C <T2 <280 ° C. Preferably the mixtures takes a sulfonic fophosphatglas following composition using 4.9% Lι₂0, 9.4% Na₂0, 7.1% K₂0, 1, 6% CaO, 36.6% ZnO, 20.0% P₂0₅ and 20.4% S0₃, This glass has a glass transition temperature T2 of 268 ° C.

As a high-performance thermoplastic is a polyether ether ketone advantageous (PEEK), polyetherimide (PEI), a polyphenylene sulfide (PPS), a teilaro atisches polyamide such as polyphthalamide a id (PPA), or a flussigkπstallmes polymer (LCP). For these polymers, the glass transition temperature of the glass component of the processing temperature of the thermoplastic material is adjusted. Further high-performance thermoplastics are polyaryl (PAEK) in general, for example, poly ether ketone (PEK), and polysulfone (PSU), especially polyether sulfone (PES) and polyphenylene (PPSU). In particular, the use of polyphenylene ether ether ketone and poly has the advantage that this results in components which have very good tribological properties. This can be switched to dispense an additional external lubrication.

The proportion of the glass component, ie, the sulfophosphate, at the glass / plastic mixture is preferably from 15 to 60 wt .-%. For certain applications, the glass content can be up to 80 percent by .-%. The mixtures may also contain conventional additives such as color pigments and stabilizers. wendungsmoglichkeiten arrival consist for example in sensors, actuators, connectors, electro-optic components and relays.

The components produced using the inventive shaped methods may be used particularly advantageously m arrangements in which they cooperate with other components under application of mechanical friction. In particular, it is contemplated to use the components produced by the inventive shaped elektromechamschen method in switches. There comes m particularly the low-abrasion behavior for Wear, because contamination of the electric contacts can be largely avoided. The reduced friction, energy consumption is reduced during operation of the component and extends the life of the component.

The invention with reference to an exemplary embodiment and the accompanying figure is explained in more detail.

The figure shows an upside to the inventive shaped method produced component to a second component in schematic cross section.

The figure shows a product manufactured with the method inventive shaped first component 1, which is arranged on a second component second In the first component 1, a force F, which prints it against the second component. 2 Further, the first component 1 moves transversely of the second component 2, as indicated by the double arrow. Despite the friction that arises between the first component 1 and the second member 2 hardly generates the first component 1 abrasion. The first component 1 can for example be made by injection molding. The preparation in an injection molding process has the advantage that a large number of components almost any shape m stucco large number can be produced simultaneously.

The invention is not limited to the embodiment shown as an example, but is defined by claim 1. m its most general form.