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Hydrolysis-resistant dimer acid type polyurethane and preparation method thereof

A dimer acid-type, hydrolysis-resistant technology, applied in the field of polyurethane, can solve the problems of no obvious reduction in petrochemical resources and a small degree of improvement in hydrolysis resistance, achieve obvious application and market prospects, improve hydrolysis resistance and Water resistance, reduce the effect of use

Inactive Publication Date: 2011-08-31
GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, the amount of dimer acid used does not exceed 30% of the weight of the mixed dibasic acid, which does not significantly reduce the use of petrochemical resources, and the degree of improvement in hydrolysis resistance is not large

Method used

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  • Hydrolysis-resistant dimer acid type polyurethane and preparation method thereof
  • Hydrolysis-resistant dimer acid type polyurethane and preparation method thereof
  • Hydrolysis-resistant dimer acid type polyurethane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The preparation polybasic acid is dimer acid, the polyester polyol of functional group mol ratio COOH / OH=1: 1.10: with 583 parts of dimer acid (high-purity dimer acid, acid value 193mgKOH / g, welfare resin factory of Guangrao County) and 105 parts of neopentyl glycol were added into the reactor, and the temperature was raised with stirring under a nitrogen atmosphere. React at 120°C for 2h, 140°C for 1h, and 175°C for 2h. Then the temperature was raised to 210°C for another 4 hours, and the acid value was measured by sampling. The acid value was equal to 13 mgKOH / g, and the nitrogen flow was stopped, and vacuum was drawn. React under vacuum for 2 hours, take a sample to measure the acid value, the acid value is 0.48mgKOH / g, the output is light brown liquid, the hydroxyl value is 42.32mgKOH / g, and polyester polyol is obtained.

[0030] Preparation of dimer acid polyurethane:

[0031] (1) Prepolymerization reaction: After dehydrating 100 parts of polyester polyol under r...

Embodiment 2

[0036] The preparation polybasic acid is dimer acid, the polyester polyol of functional group molar ratio COOH / OH=1: 1.55: with 583 parts of dimer acid (high-purity dimer acid, acid value 193mgKOH / g, Guangrao County welfare resin factory, under Same), 100 parts of neopentyl glycol and 80 parts of 1,6-hexanediol were added into the reaction kettle, stirred and heated under nitrogen atmosphere. React at 120°C for 2h, 140°C for 1h, and 175°C for 2h. Then the temperature was raised to 210°C for another 4 hours, and the acid value was measured by sampling. The acid value was equal to 12 mgKOH / g, and the nitrogen flow was stopped, and the vacuum was drawn. React under vacuum for 2 hours, take a sample to measure the acid value, the acid value is 0.57mgKOH / g, the output is light brown liquid, the hydroxyl value is 54.82mgKOH / g, and polyester polyol is obtained.

[0037] Preparation of dimer acid polyurethane:

[0038](1) Prepolymerization reaction: After dehydrating 100 parts of po...

Embodiment 3

[0043] Preparing polybasic acid is that dimer acid accounts for 89% of mixed polybasic acid weight, the polyester polyol of functional group mol ratio COOH / OH=1: 1.48: with 408 parts of dimer acid, 52 parts of adipic acid, 120 parts of neopentyl glycol and 20 parts of ethylene glycol are added in the reaction kettle, and reacted according to the method described in Example 1 to obtain an acid value of 0.62 mgKOH / g, the discharge is a light brown liquid, and the hydroxyl value is 49.43 mgKOH / g to obtain a polyester polyol .

[0044] Preparation of dimer acid polyurethane:

[0045] (1) Prepolymerization reaction: After dehydrating 100 parts of polyester polyol at 120°C for 2 hours under reduced pressure, the temperature was lowered to 80°C, and 35 parts of N,N-dimethylformamide, 35 parts of dioxane and 12 parts of 1 , 6-hexamethylene diisocyanate, reacted at 80°C for 1h to obtain a prepolymer;

[0046] (2) chain extension reaction: add 2 parts of ethylene glycol in the prepoly...

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Abstract

The invention discloses hydrolysis-resistant dimmer acid type polyurethane which comprises 100 parts of polyester polylol, 18-35 parts of diisocyanate, 2-5 parts of chain extender, 0-5 parts of castor oil and 180-360 parts of organic solvent; and the preparation method comprises the following steps: performing decompression dehydration on the polyester polylol at the temperature of 110-120 DEG C for 2-3 hours, then reducing the temperature to 60-80 DEG C, adding the organic solvent and the diisocyanate, reacting for 1-3 hours at the temperature of 60-80 DEG C, obtaining a prepolymer, then adding the chain extender, the castor oil and the organic solvent, reacting for 1-3 hours at the temperature of 60-80 DEG C, adding the diisocyanate and the organic solvent into the obtained polymer, reacting for 2-5 hours at the temperature of 60-80 DEG C, and obtaining the solvent type polyurethane containing a dimmer acid structure unit. Considering from two aspects, namely economy and benefit, the hydrolysis-resistant dimmer acid type polyurethane with low cost is synthesized, and the hydrolysis-resistant dimmer acid type polyurethane has obvious application and market prospects.

Description

technical field [0001] The invention belongs to the field of polyurethane in polymer materials, in particular to a hydrolysis-resistant dimer acid type polyurethane and a preparation method thereof. Background technique [0002] Polyurethane has good properties such as low temperature resistance, tear resistance and abrasion resistance, and is widely used in leather, coatings, adhesives and sealants and other fields. According to the structure of the soft segment, polyurethane can be divided into polyether type and polyester type polyurethane. Compared with polyether polyurethane, polyester polyurethane has better mechanical properties and dyeability. However, the main chain structure of polyurethane molecules contains a large number of polar groups, making polyurethane materials easy to absorb water. For polyester polyurethanes with ester groups in the soft segment structure, after moisture penetrates into the molecular main chain structure, it is very easy to cause hydro...

Claims

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Application Information

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IPC IPC(8): C08G18/67C08G18/66C08G18/42C08G18/10C08G63/16
Inventor 许凯刘新陈鸣才
Owner GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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