Synthesis method of polyether polyalcohol with low unsaturation degree and high molecular weight

A polyether polyol, high molecular weight technology, applied in chemical instruments and methods, polyurea/polyurethane adhesives, adhesive types, etc., can solve the problems of low molecular weight, prolonged processing time, economic losses, etc. Effects of high molecular weight, good properties, high tensile tear strength and elongation at break

Inactive Publication Date: 2010-12-22
SHANDONG BLUSR DONGDA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 2. When using conventional difunctional polyols as starters to prepare polyether polyols with low unsaturation and high relative molecular weight, due to their low molecular weight, the initiation reaction of double metal cyanide complexes is slow. In addition The molecular weight and boiling point are relatively low. In the dehydration process in the preparation process of polyether polyol, it will be released together with water, which will affect the designed amount of reactants.
The end of the polyether polyol prepared by homopolymerization of propylene oxide is usually a secondary hydroxyl group, which limits the application of polyurethane in bulk high resilience and molded foams, and in polyurethane elastomers and prepolymer foams application, secondary hydroxyl groups will prolong the processing time, resulting in economic loss

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In a 3L stainless steel reaction kettle, at room temperature, add 48.912g of tripropylene glycol, start stirring, carry out nitrogen replacement, and vacuumize. After the oxygen content in the kettle is less than 100ppm, vacuumize to -0.098Mpa, and pump in potassium hydroxide 1. Heating up to 50°C, dehydrating under reduced pressure for 2 hours, adding propylene oxide, reacting for 3 hours, after refining treatment, set aside, replacing with nitrogen, vacuuming, adding 0.1019g of zinc-cobalt double metal cyanide complex catalyst, ring Propylene oxide / ethylene oxide feed, react for 4 hours, cool down, and set aside. Potassium hydroxide 2 was sucked in by vacuum, and the cumulative feed amount of potassium hydroxide 1 and 2 was 0.8646g. After nitrogen replacement and dehydration under reduced pressure, ethylene oxide was fed, and the total feed amount of propylene oxide was 1714g. The feed amount is 286g, the pressure is controlled at 0-0.5Mpa, the temperature is 50-60°C,...

Embodiment 2

[0026] In a 3L stainless steel reaction kettle, at room temperature, add 48.741g of dipropylene glycol, start stirring, carry out nitrogen replacement, and vacuumize. After measuring the oxygen content in the kettle is less than 100ppm, vacuumize to -0.098MPa, and pump in potassium hydroxide 1. Heating up to 100°C, dehydrating under reduced pressure for 2 hours, adding propylene oxide, reacting for 3 hours, after refining treatment, for later use, replacing with nitrogen, vacuuming, adding 0.1001g of zinc-cobalt double metal cyanide complex catalyst, ring Feed oxypropane, react for 4 hours, cool down, and set aside. Potassium hydroxide 2 is pumped in by vacuum, the cumulative feed amount of potassium hydroxide 1 and 2 is 0.6009g, and the cumulative feed amount of propylene oxide is 2000g. After nitrogen replacement and dehydration under reduced pressure, the pressure is controlled at 0-0.5Mpa and the temperature is 110- Reaction at 120°C for 0.5 hours, cooling down to remove m...

Embodiment 3

[0028] In a 3L stainless steel reaction kettle, at room temperature, add 48.012g of propylene glycol, start stirring, carry out nitrogen replacement, and vacuumize. After measuring the oxygen content in the kettle is less than 100ppm, vacuumize to -0.098MPa, and pump potassium hydroxide 1 , heated up to 150°C, dehydrated under reduced pressure for 2 hours, added propylene oxide, reacted for 3 hours, refined, set aside, replaced with nitrogen, vacuumed, added 0.9003g of zinc-cobalt double metal cyanide complex catalyst, epoxy Propane / ethylene oxide is fed, reacted for 4 hours, cooled, and set aside. Potassium hydroxide 2 was sucked in by vacuum, and the cumulative feed amount of potassium hydroxide 1 and 2 was 9.0027g. After nitrogen replacement and dehydration under reduced pressure, ethylene oxide was fed, and the total feed amount of propylene oxide was 1600g. The amount of material is 400g, the pressure is controlled at 0-0.5Mpa, the temperature is 140-150°C and the reactio...

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PUM

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Abstract

The invention relates to a synthesis method of polyether polyalcohol with low unsaturation degree and high molecular weight, which is characterized in that the polyether polyalcohol is synthesized by adopting the following steps of: carrying out catalytic reaction of a polyalcohol compound used as an initiating agent under the catalysis of two different catalysts of alkali metal hydroxide catalyst and bimetal cyanogen compound catalyst under the pressure of 0-0.5MPa and at the temperature of 50-150 DEG C, and carrying out polymerization with an epoxy compound. The prepared product has high molecular weight, narrow distribution, and quite high tensile tear strength and elongation at break under the lower hardness; in the production process, bifunctional polyalcohol can not be removed together with water, thereby not influencing the design flow; the prepared polyether polyalcohol can be used for producing foams with high rebound and good processability and does not reduce other physical properties of the foams; and the polyether polyalcohol can be applied to polyurethane products of sealant, paving materials, waterproof materials, and the like and has favorable property especially on the aspects of shock absorption and waterproofing of rapid transit railways.

Description

technical field [0001] The invention relates to a method for synthesizing polyether polyols with low unsaturation and high molecular weight, which belongs to the field of chemical industry. Background technique [0002] Polyether polyol is an important raw material for the synthesis of polyurethane. With the rapid development of the polyurethane industry, in recent years, major domestic and foreign production companies and related scientific research institutions have focused on improving the quality and performance of polyether polyol products and reducing production costs. A lot of research and development work, the most representative breakthrough is the research and development of polyether polyols with low unsaturation and high molecular weight. [0003] In order to adapt to the development trend of cold molding plasticization, low density and multi-functionalization of polyurethane products, various special polyol products have emerged, among which polyether polyols wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/28C08G18/48C09J175/08C09K3/10
Inventor 徐韦郭辉刘小会姜永获李帅
Owner SHANDONG BLUSR DONGDA CHEM
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