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Blocked polyisocyanates

A polyisocyanate, general formula technology, used in polyurea/polyurethane coatings, coatings, pretreated surfaces, etc., can solve the problem that the paint body cannot obtain paint properties

Inactive Publication Date: 2008-05-14
COVESTRO DEUTSCHLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, some paint systems do not give the desired paint properties at these bake temperatures

Method used

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  • Blocked polyisocyanates
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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0031] The preparation of the capping agent can be carried out in a suitable solvent, especially a polar solvent. The expected product is optionally separated from the solvent and / or by-products by distillation or extraction, and then reacted with the polyisocyanate. However, it is also possible to carry out the reaction in a suitable lacquer solvent, and use the resulting reaction mixture directly to prepare the blocked polyisocyanate.

[0032] The end-capping agent of general formula (III) prepared by a method different from the above-mentioned route can of course also be used, for example, the end-capping agent prepared by ester exchange reaction of ethyl ester of general formula (III) to form methyl ester.

[0033] The end-capping agent of the general formula (III) can of course be mixed with each other arbitrarily as required and used in the form of a mixture. It is also possible to use any desired mixture of the blocking agent of the present invention and other blocking agen...

Embodiment 1

[0074] Example 1: End-capping agent B1

[0075] 86.09 g of methyl acrylate was added to 73.14 g of tert-butylamine dissolved in 160.0 g of methanol under stirring at room temperature to form a clear solution, and the solution was stirred at room temperature for 16 hours. The solvent was removed by distillation, and 158.1 g of the general formula was obtained

[0076]

[0077] The product is pure enough to be used in the subsequent reaction to generate blocked polyisocyanates.

Embodiment 2

[0078] Example 2: Blocking agent B2

[0079] 100.1 g of methyl methacrylate was added to 95.09 g of tert-butylamine dissolved in 175.0 g of ethanol under stirring at room temperature to form a clear solution, and the solution was stirred at 70° C. for 72 hours. The volatile components are removed by distillation, and the product phase is filtered to obtain 165.7 g as the filtrate. The general formula is

[0080]

[0081] The product is pure enough to be used in the subsequent reaction to generate blocked polyisocyanates.

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Abstract

The present invention provides a blocked polyisocyanates and one-component stoving systems containing these, and the preparation thereof and their use for the preparation of lacquers, paints, adhesives and elastomers.

Description

Technical field [0001] The invention relates to a new type of blocked polyisocyanate and self-crosslinking one-component baking paint system, and their application in the preparation of spray paint, paint, adhesive and elastomer. Background technique [0002] The use of blocking agents to temporarily protect isocyanate groups has been known for a long time. Among them, a blocked polyisocyanate is used to prepare a 1C PU baking paint system that can be stored stably at room temperature. The blocked polyisocyanate is, for example, mixed with polyesters, polyacrylates, other polymers containing hydroxyl groups, and components of spray paints and paints such as pigments, co-solvents or additives. A self-crosslinking one-component baking paint system containing a polymer with both blocked isocyanate groups and hydroxyl groups in one molecule as a binder is another form of baking paint that can be stored stably at room temperature . [0003] A review on the application of blocked polyi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/80C08G18/79C08G18/08C09D175/06C08G18/10C08G18/12C08G18/32C08G18/34C08G18/66
CPCC08G18/0823C08G18/6659C08G18/3206C08G18/348C08G18/10C09D175/06C08G18/792C08G18/12Y10T428/31601Y10T428/31598Y10T428/31551Y10T428/31605Y10T428/31591C08G18/8048C08G18/2865C08G18/80C08G18/08C08G18/791B05D3/02
Inventor J·马赞克C·蒂埃布J·迈克斯纳O·弗莱克H·穆勒
Owner COVESTRO DEUTSCHLAND AG
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