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Method for synthesizing high-activity high molecular weight polyether polyol

A polyether polyol, high molecular weight technology, applied in the chemical industry, can solve the problems of widening molecular weight distribution, turbid appearance of polyether, and inapplicability, and achieve the effects of increased application range, high reactivity, and regular distribution

Inactive Publication Date: 2012-03-28
SHANDONG BLUSR DONGDA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the preparation of high activity high molecular weight polyether polyol, along with the increase of polyether polyol molecular weight, the improvement of activity is not easy, and prior art generally is to improve the ratio of the ethylene oxide in polyether, but with ring As the ratio of oxyethane increases, the appearance of polyether begins to be cloudy, which is not suitable for transparent polyurethane products, and the molecular weight distribution widens, resulting in a decline in the overall performance of foams and products. The development of widely applicable high-activity high-molecular-weight polyether polyols Alcohol has become a difficult problem for the industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The process steps for preparing highly active high molecular weight polyether polyols are as follows:

[0019] 1. In a 3L stainless steel reaction kettle, at a temperature of 60-70°C and a pressure of 0.02-0.06MPa, 21.6g of glycerin was fed, and 2.4g of KOH was vacuum pumped in for nitrogen replacement. After the oxygen content in the kettle was measured to be less than 100ppm, Heating and dehydration under reduced pressure, H 2 O% ≤ 0.1, pressurized with nitrogen, feed propylene oxide 96g, heat up to 100-102°C, pressure not higher than 0.4MPa, internal pressure reaction for 2 hours, control temperature 100-102°C, pressure 0.05-0.1MPa, cool down to 90°C, sampled for testing, and refined to obtain product L to be processed for later use.

[0020] 2. When the pressure is lower than -0.093MPa, add 300g of propylene oxide to the product L, the pressure is not higher than 0.44MPa, the temperature is 115°C, the internal pressure is reacted for 4 hours, vacuum degassing, nitr...

Embodiment 2

[0026] The process steps for preparing highly active high molecular weight polyether polyols are as follows:

[0027] 1. In a 3L stainless steel reaction kettle, at a temperature of 60-70°C and a pressure of 0.02-0.06MPa, feed 20g of glycerin, vacuum pump 2.4g of KOH, and perform nitrogen replacement. After measuring the oxygen content in the kettle is less than 100ppm, raise the temperature Dehydration under reduced pressure, H 2 O% ≤ 0.1, pressurized with nitrogen, feed propylene oxide 96g, heat up to 100-102°C, pressure not higher than 0.4MPa, internal pressure reaction for 2 hours, control temperature 100-102°C, pressure 0.05-0.1MPa, cool down to 90°C, sampled for testing, and refined to obtain product L to be processed for later use.

[0028] 2. When the pressure is lower than -0.093MPa, add 300g of propylene oxide to the product L, the pressure is not higher than 0.44MPa, the temperature is 115°C, the internal pressure is reacted for 4 hours, vacuum degassing, nitrogen ...

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Abstract

The invention relates to a method for synthesizing high-activity high molecular weight polyether polyol, belong to the field of chemical industry. The invention solves the technical problem of providing a method for synthesizing high-activity high molecular weight polyether polyol with uniform and transparent appearance. The invention has the technical scheme that the method for synthesizing high-activity high molecular weight polyether polyol comprises the following steps of: adopting a polyol compound as an initiating agent, adding a catalyst and an epoxy compound into a reaction system by steps for multiple times at the pressure of 0.1-0.5 MPa and the temperature of 60-140 DEG C, and carrying out polymerization in a high-speed stirring device. The polyether polyol prepared by using the method provided by the invention has high molecular weight, regular distribution and relatively low viscosity. Compared with general soft-foam high elastic polyether polyol on the market, the polyether polyol has higher molecular weight, higher reaction activity and more regular molecular weight distribution.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a method for synthesizing polyether polyol with high activity and high molecular weight. 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 improvement of the quality and performance of polyether polyol products and the reduction of production costs. In order to further improve the performance of polyurethane materials and reach people's expected level, we need to develop a higher molecular weight (molecular weight greater than 6000), higher activity polyether polyol. When high activity and high molecular weight polyether polyols are used in the manufacture of polyurethane foam and elastomer products, the amount of isocyanate is reduced, thereby saving costs and improv...

Claims

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Application Information

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IPC IPC(8): C08G65/28C08G65/30C08G18/48
Inventor 徐韦
Owner SHANDONG BLUSR DONGDA CHEM
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