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Blocked polyisocyanates

A polyisocyanate and group technology, which is used in the field of blocked polyisocyanates and self-crosslinking one-component baking paint systems, can solve the problems of destroying product color, increasing equipment cost and time, and product damage.

Inactive Publication Date: 2009-09-09
COVESTRO DEUTSCHLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of these polyisocyanates is that 3,5-dimethylpyrazole is solid at room temperature and thus difficult to meter
In order to meter in liquid form, it must be dissolved in the lacquer solvent at elevated temperature, or melted, but this means an additional work step
EP-A 00713871 actually discloses a process for the preparation of polyisocyanates blocked with 3,5-dimethylpyrazole, wherein the 3,5-dimethylpyrazole is prepared in a lacquer solvent and the reaction solution is immediately used for blocking end-capping without separation from the solid, but this results in increased equipment cost and / or time, and the method must use a carcinogen trap to prepare the end-capping agent
Moreover, it cannot be ignored that the by-products of the preparation of 3,5-dimethylpyrazole can enter the product and cause damage to it, for example by destroying its color

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0029] The preparation of the capping agents is preferably carried out in suitable, especially polar solvents. The desired product can optionally be 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 to use the resulting reaction mixture directly for the preparation of blocked polyisocyanates.

[0030] The capping agent of general formula (III) prepared by a method other than the above-mentioned route is also usable, for example, the capping agent prepared by transesterification of ethyl ester of general formula (III) to methyl ester.

[0031] The blocking agents of the general formula (III) can of course be used in any desired mixtures with one another.

[0032]Triisocyanatononane and all known aliphatic, cycloaliphatic and aromatic diisocyanates and based on them, an isocyanate content of 0.5% to 60% by weight, preferabl...

Embodiment 1

[0091] (Preparation of solvent-containing polyisocyanate crosslinking agent of the present invention)

[0092] 159.3 g (1 equivalent) of blocking agent B1 were added dropwise within 10 minutes to 192.7 g (1 equivalent) of polyisocyanate A1 dissolved in 88.0 g of butyl acetate. During this process, the temperature rose to about 40°C. After stirring at this temperature for 4 hours, free NCO groups were no longer detected by IR spectroscopy. 440.0 g of a clear product were obtained having the following performance parameters:

[0093] Solid content: 80%

[0094] BNCO content: 9.54%

[0095] Viscosity / 23℃: 3500mPas

Embodiment 2

[0103] (Preparation of solvent-containing polyisocyanate crosslinking agent of the present invention)

[0104] 159.3 g (1 equivalent) of blocking agent B1 were added dropwise within 10 minutes to 356 g (1 equivalent) of polyisocyanate A2 dissolved in 69.0 g of butyl acetate. The temperature was raised to about 60°C. After 6 hours of stirring at this temperature, free NCO groups were no longer detected by IR spectroscopy. 584.3 g of a clear product were obtained having the following performance parameters:

[0105] Solid content: 70%

[0106] BNCO content: 7.19%

[0107] Viscosity / 23℃: 10000mPas

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Abstract

Blocked polyisocyanates and one-component stoving systems containing these blocked polyisocyanates, and the preparation thereof and their use for the preparation of lacquers, paints, adhesives and elastomers.

Description

[0001] The patent application for the present invention is an application for an invention patent with the international application number PCT / EP2004 / 006475, the international application date is June 16, 2004, the application number entering the Chinese national phase is 200480017914.3, and the invention name is "blocked polyisocyanate". Divisional application. technical field [0002] The present invention relates to a novel blocked polyisocyanate and self-crosslinking one-component baking varnish system, and their application in the preparation of spray paint, paint, adhesive and elastomer. Background technique [0003] The use of blocking agents for the temporary protection of isocyanate groups has been known for a long time. Among them, blocked polyisocyanate is used to prepare a thermosetting one-component polyurethane baking varnish system (1C PU baking varnish system) that can be stored stably at room temperature. Blocked polyisocyanates are mixed, for example, wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/80C08G18/42C08G18/64C08G18/62C09D175/04C08G18/79
CPCC09D175/04C08G18/6216C08G18/807C08G18/792C08G18/80C08G18/79C08G18/62B05D3/02C08G18/706C08G18/808C08G18/10C08G18/0866
Inventor J·马赞克R·哈尔帕普M·梅希蒂尔T·克里穆马谢C·蒂埃布
Owner COVESTRO DEUTSCHLAND AG
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