Reactive mixture for coating molded objects by means of reaction injection molding and coated molded object

A reaction injection molding, reactive technology, applied in the direction of nanotechnology, coating, transportation and packaging for materials and surface science, which can solve the problems of short cycle time, inaccessibility, high climate stability and low energy consumption, high hardness effect

Inactive Publication Date: 2010-03-24
EVONIK ROEHM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Premature polymerization of reactive mixtures in injection molding equipment is another problem with the injection molding process described in the publications JP 11300776 and JP 2005074896, making short cycle times hardly achievable by this process in mass production

Method used

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  • Reactive mixture for coating molded objects by means of reaction injection molding and coated molded object
  • Reactive mixture for coating molded objects by means of reaction injection molding and coated molded object

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0109] Comparative Example 1 was essentially repeated, except here that the curing by UV radiation was carried out after thermal curing of the coated injection molded part. The coating remains crack-free. The scratch resistance of the coatings was studied in small-scale experiments using steel wool, where the coatings thus obtained achieved a scratch resistance of 3 (good scratch resistance).

Embodiment 2

[0114] Comparative Example 2 was essentially repeated, except here that the curing by UV radiation was carried out after thermal curing of the coated injection molded part. The coating remains crack-free. The scratch resistance of the coatings was investigated in pilot tests using steel wool, the coatings thus obtained achieving a scratch resistance of 3 (good scratch resistance).

Embodiment 3

[0116] Example 1 was essentially repeated, but here a compound containing 97.75% by weight trimethylolpropane triacrylate, 0.25% by weight bis(4-tert-butylcyclohexyl) peroxydicarbonate (thermal initiator) and 2% by weight 1 - Benzoylcyclohexanol ( 184) reactive mixture.

[0117] The thermal curing reaction started after about 15 seconds. After UV curing, a crack-free coating was obtained, which had a thickness of approximately 20 μm (average of four individual measurements).

[0118] The scratch resistance of the coatings was investigated in pilot tests using steel wool, the coatings thus obtained achieving a scratch resistance of 1 (very good scratch resistance).

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Abstract

The present invention relates to a reactive mixture for coating molded objects by means of reaction injection molding comprising at least 40% by weight of 5 (meth) acrylates with at least two double bonds, wherein the reactive mixture comprises at least one photoinitiator and at least one thermal initiator. Furthermore, the present invention describes a coated molded object comprising a molded object which is obtainable by injection molding and which includes at least one polymer selected from the group comprising poly(methyl methacrylate), poly(methacryl methylimide), styrene-acrylonitrile copolymer, styrene-maleic acid copolymer, and poly(methyl methacrylate) copolymer, and a coating, which is obtainable by the polymerization of (meth) acrylates with at least two double bonds, wherein the coating has an adhesive strength rating of not more than 1 according to the cross-cut test and a decrease in gloss at 20 DEG C according to a scratch-resistance test according to ASTM 1044 (12/05) (load of 500 g, number of cycles = 100) of not more than 10%.

Description

technical field [0001] The invention relates to reactive mixtures for coating shaped bodies by reaction injection molding. In addition, the invention describes coated shaped bodies. Background technique [0002] Thermoplastic molding compounds based, for example, on polymethylmethacrylate (PMMA) can be used for a wide variety of applications. For this purpose, the material is extruded or injection molded to produce shaped parts. [0003] Molded parts are today frequently used for the production of components that are subject to high stress, such as movable parts (interior and Colored additional parts (eg in the automotive industry: exterior mirrors, pillar claddings, mirror triangles) or opaquely colored consumer goods. Due to the high stresses, the surfaces of the moldings used in this way are prone to scratches, which are often visually unacceptable. Molded bodies produced by injection molding are particularly scratch-sensitive in this respect. Furthermore, from an ec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D4/00B29C45/16C08J3/24
CPCB29C45/0001B29C45/1679C09D4/00Y10T428/263Y10T428/264Y10T428/31928Y10T428/31913Y10T428/31924Y10T428/31721C08J3/24B82B3/00B82Y30/00C08F4/32C08F2/46
Inventor K·舒尔特斯T·戈尔达克K·科拉勒夫斯基W·霍斯G·斯尤姆E·格罗斯E·费尔格
Owner EVONIK ROEHM GMBH
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