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Polyester polyol

A technology of polyester polyol and diol, applied in the field of polyester polyol, can solve the problems of poor mutual solubility of polyester, polyether and foaming agent, easy shrinkage of foam, low functionality, etc., so as to improve mutual solubility and synthesize Cost reduction, no secondary pollution effect

Inactive Publication Date: 2008-09-17
张鹏飞
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the rigid foam composite prepared by using this kind of polyester instead of polyether, the mutual solubility of polyester, polyether and foaming agent is poor, and its functionality is low, and the foam is easy to shrink

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1, add 250 grams of trimethylol propane raffinate, 250 grams of neopentyl glycol raffinate, and 21 grams of mixed dibasic acid in 1 liter of reactor equipped with stirrer, condenser, thermocouple and vacuum system , phthalic anhydride 25 grams.

[0025] Then within about 2 hours, the reaction mixture was heated to 140°C, and continued to heat up to 220°C under nitrogen protection, and kept at a constant temperature for 3-4 hours. Turn on the vacuum pump to gradually reduce its pressure from normal pressure to a 600 mm pump column. When the acid value is ≤2mg koH / g and the hydroxyl value is 450-600mg koH / g, it can be discharged.

[0026] Feeding total amount 546 grams, product 497 grams, yield 91%.

[0027] Product Quality: Hydroxyl Value: 574 mg koH / g

[0028] Acid value: 0.87mg koH / g Appearance: brownish red mucus

Embodiment 2

[0029] Example 2, the same method as in Example 1: add 250 grams of trimethylolpropane raffinate, 125 grams of diethylene glycol, 1 to 25 grams of phthalic anhydride, 500 grams of the total amount of feed, 471 grams of product, and a yield of 94.2%.

[0030] Product Quality: Hydroxyl Value: 543mg koH / g

[0031] Acid value: 1.44mg koH / g Appearance: Brown-yellow mucus

[0032] The foaming test was good.

Embodiment 3

[0033] Example 3, the same method as in Example 1: add 400 grams of trimethylolpropane raffinate, 40 grams of phthalic anhydride, 26 grams of mixed dicarboxylic acid, 466 grams of the total amount of feed, 430 grams of product, and a yield of 92.3%.

[0034] Product Quality: Hydroxyl Value: 562 mg koH / g

[0035] Acid value: 1.31mg koH / g Appearance: light yellow mucus

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Abstract

The invention discloses polyester polyol, which is characterized in that the residual liquid that is generated from the production of oxalic acid, trimethylol propane and neopentyl glycol is selected as the raw material, thus recycling the waste liquid, reducing the environmental pollution and reducing the production cost of the polyester polyol by 15 to 25 percent. The prepared polyester polyol is used in polyurethane hard foam plastics.

Description

technical field [0001] This invention relates to polyester polyols for preparing foams. Background technique [0002] The polyester polyols commonly used in polyurethane synthetic materials are aliphatic polyester polyols. With the improvement of product requirements and the abundance of raw material sources, aromatic polyester polyols are increasingly used in the preparation of polyurethane foams, adhesives and elastomers, and polyester diols with low hydroxyl values ​​may have a slight Branched polyester diols are used to synthesize polyester polyurethane soft foam; high hydroxyl value, low molecular weight aromatic polyester polyols are used to synthesize polyurethane rigid foam. In addition to the properties of polyether-type rigid polyurethane foam, rigid polyurethane foam containing polyester also has the characteristics of good toughness, excellent flame retardancy, and low price. In the early 1980s, polyester polyols made from polyester waste residue, phthalic anhy...

Claims

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Application Information

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IPC IPC(8): C08G63/183C08G18/42C08G101/00
Inventor 张鹏飞
Owner 张鹏飞
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