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Method for synthesis of low-unsaturation degree, high-molecular weight and high-activity polyether polyol

A high-activity polyether and high molecular weight technology, applied in the chemical field, can solve problems such as narrow molecular weight distribution, high average functionality, and increased side reactions, and achieve the effects of regular molecular weight distribution, short demoulding time, and improved resilience

Inactive Publication Date: 2014-04-09
SHANDONG BLUSR DONGDA CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the catalysis of alkali metal hydroxide, as the molar mass of the polymer increases, the unfavorable side reactions increase significantly, and the terminal group of the polyether loses its reactivity after forming an unsaturated double bond, and the growth is terminated, which affects the average molecular weight of the polyether. The high unsaturation value affects the performance of polyether polyols; the use of double metal cyanide complex catalysts can effectively inhibit the occurrence of chain transfer side reactions, and almost no isomerization of propylene oxide to allyl alcohol occurs, so The prepared polyether polyol has the characteristics of low unsaturation, high average functionality and narrow molecular weight distribution, but it cannot meet the market requirements in terms of activity for foam products

Method used

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  • Method for synthesis of low-unsaturation degree, high-molecular weight and high-activity polyether polyol
  • Method for synthesis of low-unsaturation degree, high-molecular weight and high-activity polyether polyol

Examples

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Effect test

Embodiment 1

[0026] Preparation of low unsaturation, high molecular weight, high activity polyether polyol, the steps are as follows:

[0027] Step 1: In a 5L stainless steel reaction kettle, at a temperature of 65±5°C, add 400g of glycerin and 1,1,1-trimethylolpropane each, then add 8g of KOH, carry out nitrogen replacement, and measure the oxygen content in the kettle When it is less than 100ppm, pressurize nitrogen, feed propylene oxide 2200g, heat up the reaction, and react under internal pressure for 2 hours, control the temperature at 115±2°C, and the pressure at 0.05-0.1MPa. After the reaction is completed, cool down to 80°C for finishing treatment. Product A is obtained and is ready for use.

[0028] Step 2: In a 5L stainless steel reaction kettle, at a temperature of 80°C, add 250g of product A, then add 8gKOH, and carry out nitrogen replacement. After the oxygen content in the kettle is less than 100ppm, pressurize with nitrogen, and feed 2200g of propylene oxide , the temperatu...

Embodiment 2

[0031] Preparation of low unsaturation, high molecular weight, high activity polyether polyol, the steps are as follows:

[0032] Step 1: In a 5L stainless steel reaction kettle, at a temperature of 65±5°C, add 400g of glycerin and 1,1,1-trimethylolpropane each, then add 8g of KOH, carry out nitrogen replacement, and measure the oxygen content in the kettle When it is less than 100ppm, pressurize nitrogen, feed propylene oxide 2200g, heat up the reaction, and react under internal pressure for 2 hours, control the temperature at 115±2°C, and the pressure at 0.05-0.1MPa. After the reaction is completed, cool down to 70°C for finishing treatment. Product A is obtained and is ready for use.

[0033] The second step: In a 5L stainless steel reaction kettle, at a temperature of 80°C, add 250g of product A, then add 0.2g of double metal cyanide complex, add acid to adjust to acidity, dehydrate for 30 minutes, and then add 250g of product A at a pressure of -0.07- 0.1MPa, feed propyl...

Embodiment 3

[0036] Preparation of low unsaturation, high molecular weight, high activity polyether polyol, the steps are as follows:

[0037] Step 1: In a 5L stainless steel reaction kettle, at a temperature of 65±5°C, add 400g of glycerin and 1,1,1-trimethylolpropane each, then add 8g of KOH, carry out nitrogen replacement, and measure the oxygen content in the kettle When it is less than 100ppm, pressurize nitrogen, feed propylene oxide 2200g, heat up the reaction, and react under internal pressure for 2 hours, control the temperature at 115±2°C, and the pressure at 0.05-0.1MPa. After the reaction is completed, cool down to 80°C for finishing treatment. Product A is obtained and is ready for use.

[0038] Step 2: In a 5L stainless steel reaction kettle, at a temperature of 80°C, add A250g product, then add 8gKOH, and carry out nitrogen replacement. After the oxygen content in the kettle is less than 100ppm, pressurize nitrogen, and feed 2200g propylene oxide. Raise the temperature to r...

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Abstract

The invention relates to a method for synthesis of low-unsaturation degree, high-molecular weight and high-activity polyether polyol and belongs to the field of chemical engineering. An initiator and an epoxy compound undergo a polymerization reaction in the presence of a catalyst to produce the low-unsaturation degree, high-molecular weight and high-activity polyether polyol. In the polymerization reaction process, the epoxy compound and the catalyst are added into the reaction system by three steps and through the polymerization reaction, the low-unsaturation degree, high-molecular weight and high-activity polyether polyol is obtained. The low-unsaturation degree, high-molecular weight and high-activity polyether polyol has regular molecular weight distribution, low viscosity, a low unsaturation value and high activity. Compared with the universal soft-foam polyether polyol in the market, the low-unsaturation degree, high-molecular weight and high-activity polyether polyol can effectively improve foam resilience. The low-unsaturation degree, high-molecular weight and high-activity polyether polyol can be used for preparation of various molding foam and has the characteristics of high activity and short demolding time.

Description

technical field [0001] The invention belongs to the field of chemistry, and in particular relates to a method for synthesizing polyether polyols with low unsaturation, high molecular weight and high activity. Background technique [0002] In recent years, with the rapid development of the polyurethane industry, major domestic and foreign production enterprises and scientific research institutions have carried out a lot of research and development work on the quality and performance of polyether polyol products. In order to achieve the desired level, we need to develop a polyether polyol with low unsaturation, higher molecular weight (more than 8000 molecular weight), and higher activity. Low unsaturation, high molecular weight, and high activity polyether polyols can reduce the amount of isocyanate used in the manufacture of polyurethane foam and elastomer products, thereby saving costs and improving the elasticity and comfort of the foam. Products are widely used It can be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/28C08G18/48
Inventor 董立红刘小会秦好辉孙苗肖春红
Owner SHANDONG BLUSR DONGDA CHEM
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