Malonic ester blocked HDI trimer with IPDA stabilization and formaldehyde stabilization

A polyisocyanate and formaldehyde technology, applied in the use of 1-amino-3, can solve the problems of insufficient prevention of turbidity and precipitation, and achieve the effects of less thermal yellowing, reduced thermal yellowing, and good coating performance.

Inactive Publication Date: 2005-06-15
BAYER AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has been found that in the case of certain polyisocyanates the method of DE-A 19 813 352 is not sufficient to prevent turbidity and precipitation (cf. comparative examples 2 and 3)

Method used

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  • Malonic ester blocked HDI trimer with IPDA stabilization and formaldehyde stabilization
  • Malonic ester blocked HDI trimer with IPDA stabilization and formaldehyde stabilization
  • Malonic ester blocked HDI trimer with IPDA stabilization and formaldehyde stabilization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1 (according to the present invention)

[0044] The blocked polyisocyanate crosslinker described herein has an IPDA content of 2.32 wt% and a formaldehyde content of 2.46 wt%, on a solids basis.

[0045] Element

[0046] 196.0g based on having an NCO content of 21.4wt%, at

[0047] Viscosity at 23°C is about 3000mPas

[0048] The content of 1,6-diisocyanatohexane (HDI)

[0049] Isocyanurate Coating Polyisocyanate

[0050] 152.0g (0.95mol) diethyl malonate

[0051] 3.0g 30% solution of sodium methoxide in methanol

[0052] 8.5g 3,3,5-trimethyl-5-aminomethylcyclohexylamine

[0053] (IPDA)

[0054] 9.0g (0.30mol) paraformaldehyde

[0055] 0.9g 30% solution of sodium methoxide in methanol

[0056] 40.6g N-methylpyrrolidone (NMP)

[0057] 40.6g isobutanol (IB)

[0058] 40.6g butyl glycol (BG)

[0059] 4.8g dibutyl phosphate

[0060] 496.0g

[0061] ...

Embodiment 2

[0068] Embodiment 2 (comparative example)

[0069] The crosslinker was again prepared as in Example 1 with the following changes: 8.5 g of IPDA was omitted and 16.0 g of diethyl malonate was used instead. The crosslinker became cloudy after 7 days of storage at room temperature, but remained liquid.

Embodiment 3

[0070] Embodiment 3 (comparative example)

[0071] The crosslinker was again prepared as in Example 2 with the following changes: No formaldehyde was introduced. Compared to the crosslinker of Example 1, IPDA and formaldehyde are therefore absent.

[0072] After 3 days of storage at room temperature, the crosslinker cured to a glass-like, transparent composition.

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Abstract

The present invention relates to blocked polyisocyanate crosslinkers and their use in one-component baking varnishes, in particular in solvent-containing or mainly water-based plastic coatings with a soft-touch effect.

Description

technical field [0001] The present invention relates to blocked polyisocyanate crosslinkers and their use in one-component stoving enamels, especially solvent-borne or predominantly water-based plastic coatings with a soft-touch effect. Background technique [0002] The use of CH-esters as isocyanate blocking agents is prior art; see the work reported by S. Petersen in Liebigs Ann. Chem. 562 (1949) pp. 205 et seq. An advantage of these blocking agents, such as diethyl malonate or ethyl acetoacetate, is the low bake temperature range of 80-120°C for forming the coating. Also, unlike other sealants, they do not generate harmful substances. [0003] The disadvantages of these blocking agents are firstly the increased tendency of the coating to yellow during baking and secondly the increased tendency of the blocked polyisocyanate crosslinker to crystallize. For example, polyisocyanates based on 1,6-diisocyanatohexane (HDI) and blocked with diethylmalonate cured after a few day...

Claims

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Application Information

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IPC IPC(8): C08G18/80C08G18/40C08G18/32C08G18/54C08G18/79C08G18/84C09D175/04
CPCC08G18/3234C08G18/54C08G18/792C08G18/8093C09D175/04C08G18/80
Inventor E·科尼C·科布施U·克利珀特W·屈特纳
Owner BAYER AG
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