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Powder coatings or adhesives employing silanes or silane treated fillers

A technology of powder coatings and adhesives, applied in powder coatings, adhesives, coatings, etc., can solve problems such as easy flow, formation of tough films, and difficult low molecular weight components

Inactive Publication Date: 2000-08-16
康普顿公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The disadvantage of thermosetting powder coating systems is that it is difficult to form a tough film from low molecular weight components, so it tends to flow under shear conditions

Method used

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  • Powder coatings or adhesives employing silanes or silane treated fillers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] Silane carbamate compounds are prepared by the reaction of isocyanatopropyltrimethoxysilane with the polyol compounds listed in Table I. The reaction was carried out under the condition of a total weight of about 30 grams, using a molar ratio of 2:1.05 isocyanatopropyltriethoxysilane: diol and 300-500 ppm of dibutyl tin dilaurate (DBTDL) catalyst. A 100 ml round-bottomed 3-necked flask is equipped with a magnetic stir bar and a thermometer on one side. The equipment includes a heating sleeve with a calorimeter. Use TEFLON in joints  Lubricant. The ingredients were transferred into the flask, including a catalyst addition amount of 300-500 ppm DBTDL. Under nitrogen, slowly heat the flask until exotherm occurs. Keep the maximum temperature at about 100°C to reduce the color of the final product. Using IR, according to the disappearance of NCO to control the reaction to complete. Record the appearance and viscosity of the product. If the product is solid, the melting point is...

Embodiment 2

[0085] Preparation of bis[3-(triethoxysilyl)propyl]-1,4-cyclohexane dimethyl dicarbamate

[0086] Under the protection of nitrogen, 199.4 grams of molten cyclohexane dimethanol (purchased from Aldrich) and 685.6 grams of SILQUEST were added to a 2-liter three-necked flask equipped with a magnetic stirrer, thermometer, reflux condenser, and addition funnel.  A-1310 (3-isocyanatopropyltriethoxysilane, purchased from Witco Corp.) and 0.44 grams of DBTDL. With good mixing and a little heating, the contents of the flask exothermed up to 146°C. The temperature of the reaction mixture was maintained at 90-110C for 3 hours. As the reaction progresses, the infrared spectrum of the reaction mixture is measured at intervals. When the isocyanate is at 2272cm -1 When the absorption peak at the position almost disappears, the reaction is considered to be over. Once cooled, a white solid is obtained. The melting point of this material was measured by DSC (Differential Scanning Calorimetry) and ...

Embodiment 3

[0088] Preparation of bis[3-(trimethoxysilyl)propyl]-1,4-cyclohexane dimethyl dicarbamate

[0089] SILQUEST to be purchased Y-5187 (3-isocyanatopropyltrimethoxysilane, purchased from WitcoCorp.) was distilled and analyzed by GC to obtain a purity of 98.5%. Under the protection of nitrogen, 21.9 g of molten cyclohexanedimethanol and 0.0101 g (10 ml) of DBTDL were added to a 100 ml three-necked flask equipped with a magnetic stirrer, thermometer, reflux condenser, and addition funnel. The contents are heated to 50°C. Under good stirring, add distilled Y-5187 (3-isocyanatopropyltrimethoxysilane) dropwise. As soon as the addition was started, an exotherm occurred and the temperature of the reaction mixture rose to 100°C. Remove the heat source and continue to add Y-5187 at a rate such that the internal temperature is lower than 100°C. After the addition was complete, the reaction mixture was kept at 85°C for 1 hour. Infrared analysis showed that there was no isocyanate. After cooling...

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Abstract

A powder coating or adhesive formulation having therein a filler or pigment treated with at least silanes of formula II and hydrolyzates or condensates of said silanes, where R 1 is a hydrocarbon, acyl, alkylsilyl or alkoxysilyl group; R 2 is a monovalent hydrocarbon group; R3 is alkylene, optionally interrupted with one or more ether oxygen atoms; a 0 or 1; X is an m-valent organic group; one of A and B is NH and the other is 0, and m is 1-20.

Description

Field of invention [0001] The present invention belongs to powder coating and adhesive formulations using organosilane compounds or their hydrolysates or condensates as crosslinking agents and / or adhesion promoters. Background of the invention [0002] Powder coatings are environmentally friendly systems, which makes them an ideal alternative to traditional solvent-based coating systems. Overall, its operation and material costs can compete favorably with solvent and water-based systems in the market. [0003] Although powder coatings only occupy a part of the market share compared with solvent-based systems, this technology has quite a few advantages. The most worth mentioning is that since powder coatings have no solvents, there is no volatile organic compound (VOC) issue to consider. In addition, since less waste is generated, powder coating technology has less impact on the environment. [0004] The production of powder coating involves several steps, the most important of wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K9/06C08G18/28C08G18/32C08G18/71C08G18/80C08K5/54C08L63/00C09D5/03C09D183/04C09J183/04
CPCC08G18/3225C08G18/3206Y10S524/904C08G18/289C08G2150/20C08K5/54C08G18/718C08G18/71
Inventor L·E·卡茨H·E·佩蒂S·C·H·苏B·A·沃尔德曼B·C·巴伯拉
Owner 康普顿公司
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