Preparation method of polyurethane curing agent

A technology of polyurethane curing agent and polyester polyol, which is applied in the field of preparation of polyurethane curing agent, can solve the problems of solubility, environmental defects, high price of TMP, low reactivity, etc., and achieve enhanced solubility and miscibility, molecular weight The effect of enlargement and excellent performance

Inactive Publication Date: 2007-03-07
HANGZHOU PAINT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current two-component polyurethane has the largest variety, the largest output, and the widest application among polyurethane coatings. The most widely used supporting curing agent is the TDI-TMP (diisocyanate-trimethylolpropane) adduct series, but There are many defects in its solubility and environmental protection, and the price of TMP is relatively high
Although the pentaerythritol-TDI system is cheap, it also has problems such as low reactivity and poor solubility. Therefore, it is urgent to develop a polyurethane curing agent with low cost, good solubility and environmental protection.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The preparation of embodiment 1 polyurethane curing agent

[0020] Put 26Kg hexadecanoic acid, 6Kg benzoic acid, 17Kg phthalic anhydride, 26Kg pentaerythritol, 0.1Kg additives, 24.9Kg solvent into the reaction vessel, pass in nitrogen gas to raise the temperature and stir, slowly raise the temperature to 160°C and keep it for 2 hours, then slowly raise the temperature to 170°C and keep it 2 hours, then raise the temperature to 180°C and keep it for 2 hours, then raise the temperature to 190°C and keep it for 2 hours, and finally raise the temperature slowly to 200°C and keep it until the acid value is qualified to get the fatty acid modified polyester polyol.

[0021] Put 32Kg of fatty acid modified polyester polyol, 41Kg of solvent, and 1Kg of additives into the reaction vessel and raise the temperature to 40°C, add 25Kg of toluene diisocyanate dropwise, and control the reaction temperature at 50-60°C. Insulate at 70°C for three hours, and at 80°C for two hours. When ...

Embodiment 2

[0022] Embodiment 2 performance comparison test

[0023] According to methods known in the art, the prior art polyurethane curing agent is prepared from diisocyanate and trimethylolpropane.

[0024] The test method described in the following table 1 compares the performance of two kinds of curing agent and the batching (curing agent: main agent=1: 2 (weight ratio)) of polyurethane coating main agent, and the results are shown in the table below:

[0025] Detection Indicator

[0026] It can be seen from Table 1 that the comprehensive properties of the polyurethane curing agent of the present invention are equivalent to those of the prior art, but the curing agent of the present invention is excellent in gloss, flexibility, compatibility and other aspects.

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PUM

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Abstract

The invention discloses a preparing method of polyurethane hardener, which comprises the following steps: (1) adopting C16-18 saturated fatty acid as modifier; making benzene carbonic acid as molecular weight controller; dissolving benzoic anhydride, pentaerythrite and adjuvant in the solvent under 150-200 deg.c to proceed catalyzing reaction; preparing modified polyester polyatomic alcohol of fatty acid; (2) catalyzing modified polyester polyatomic alcohol of fatty acid, toluene diisocyanate and adjuvant in the solvent under 50-90 deg.c to obtain the product.

Description

(1) Technical field [0001] The invention relates to a preparation method of a polyurethane curing agent. (2) Background technology [0002] Due to its chemical resistance, wear resistance, good decoration, strong adhesion and other excellent properties, polyamic acid coatings are widely used in the coating of infrastructure, chemical anticorrosion, vehicles, electrical appliances and other products. The current two-component polyurethane has the largest variety, the largest output, and the widest application among polyurethane coatings. The most widely used supporting curing agent is the TDI-TMP (diisocyanate-trimethylolpropane) adduct series, but There are many defects in its solubility and environmental protection, and the price of TMP is relatively high. Although the pentaerythritol-TDI system is cheap, it also has problems such as low reactivity and poor solubility. Therefore, it is urgent to develop a polyurethane curing agent with low cost, good solubility and environ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/04C08G18/42
Inventor 姜方群杨吉陈剑铭徐今能
Owner HANGZHOU PAINT
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