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Synthesis method of polyether polyol for water swelled polyurethane waterproof elastomer

A polyether polyol and polyurethane waterproof technology is applied in the field of polyether polyol to achieve the effects of good water absorption, good structural mechanical and structural properties, and improved market competitiveness.

Inactive Publication Date: 2019-11-12
荆晓东
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Most of the water-swellable polyurethane elastomers currently on the market use general-purpose polyether polyols, and it is difficult to prepare products with good water-swellability and mechanical properties; While improving the performance, it is more important to reduce the cost of product raw materials

Method used

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  • Synthesis method of polyether polyol for water swelled polyurethane waterproof elastomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Put 40g of ethylene glycol, 35g of palm oil, and 0.61g of KOH into a 5L reactor at room temperature, replace with nitrogen three times, heat up to 90°C, add 230g of ethylene oxide to the reactor, and heat up to 110°C, react under 0.15MPa pressure, stirring speed is 260r / min, polymerize for 5h, then remove monomer under vacuum condition for 1h, cool down to 80°C, add phosphoric acid for neutralization, then add magnesium silicate for adsorption, Finally, vacuum dehydration at 110° C. for 2 hours, and filtration to obtain the intermediate polyether polyol DX-1; its hydroxyl value was tested to be 260 mgKOH / g.

[0028] (2) Put 100g of intermediate polyether polyol DX-1, 300g of sucrose, and 20.8g of KOH into a 20L reactor, replace with nitrogen three times, heat up to 60°C, and pre-drop into the reactor at a stirring speed of 220r / min Propylene oxide, after the pre-dropping is successful, add the remaining propylene oxide. The total amount of propylene oxide added is 1...

Embodiment 2

[0030] (1) Put 40g of propylene glycol, 25g of linseed oil, and 0.45g of KOH into a 5L reaction kettle at room temperature, replace with nitrogen three times, heat up to 95°C, add 115g of ethylene oxide into the reaction kettle, and raise the temperature to 120°C after adding , react under the pressure of 0.25MPa, the stirring speed is 280r / min, continue to mature for 6 hours after the polymerization reaction, then remove the monomer under vacuum for 1 hour, cool down to 80°C, add phosphoric acid for neutralization, and then add magnesium silicate Carry out adsorption, and finally vacuum dehydrate at 110°C for 2 hours, and filter to obtain the intermediate polyether polyol DX-2; its hydroxyl value is 350 mgKOH / g.

[0031] (2) Put 100g of intermediate polyether polyol DX-2, 300g of sorbitol, and 30.7g of KOH into a 20L reactor, replace with nitrogen three times, raise the temperature to 70°C, and preheat the Drop propylene oxide, and add the remaining propylene oxide after the ...

Embodiment 3

[0033] (1) Put 40g of ethylene glycol, 10g of castor oil, and 1.17g of sodium bicarbonate into a 5L reactor at room temperature, replace with nitrogen three times, raise the temperature to 100°C, add 340g of ethylene oxide into the reactor, and finish adding Then heat up to 130°C, react under the pressure of 0.15MPa, the stirring speed is 300r / min, continue aging for 4 hours after the polymerization reaction is completed, then remove the monomer under vacuum condition for 1h, cool down to 80°C, add phosphoric acid for neutralization, Magnesium silicate was then added for adsorption, and finally dehydrated in vacuum at 110°C for 2 hours, filtered to obtain the intermediate polyether polyol DX-3; its hydroxyl value was tested to be 190 mgKOH / g.

[0034] (2) Put 100g of intermediate polyether polyol DX-3, 500g of sucrose, and 36.9g of sodium bicarbonate into a 20L reaction kettle, replace with nitrogen for 3 times, heat up to 80°C, and pour into the reaction kettle at a stirring s...

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Abstract

The invention relates to the technical field of polyether polyol and in particular to a synthesis method of polyether polyol for a water swelled polyurethane waterproof elastomer. The synthesis methodfor the polyether polyol of the water swelled polyurethane waterproof elastomer comprises the following steps: firstly, performing a polymerization reaction on a small molecule dihydric alcohol and plant oil with ethylene oxide under the action of an alkali catalyst so as to obtain an intermediate polyether polyol; and further performing a polymerization reaction on the intermediate polyether polyol and a high-functionality initiator with ethylene oxide under the action of an alkali catalyst, so as to obtain the polyether polyol for the water swelled polyurethane waterproof elastomer. By adopting the synthesis method for the polyether polyol of the water swelled polyurethane waterproof elastomer, the obtained polyether polyol is low in cost, is good in water absorption performance and good in mechanical property maintenance after water absorption when being applied to the water swelled polyurethane waterproof elastomer, and is capable of effectively preventing and stopping water and has a function of supporting underground structures when being applied to underground structures.

Description

technical field [0001] The invention relates to the technical field of polyether polyols, in particular to a method for synthesizing polyether polyols for water-absorbing swelling polyurethane waterproof elastomers. Background technique [0002] Water-absorbing swellable polyurethane elastomer is a new type of functional polymer material with dual functions of elastic sealing and water-absorbing swelling and waterproofing. While maintaining the high elasticity of rubber, it also has the performance of rapid water absorption. Materials, fillers, sealing materials, waterproof materials for above-ground buildings and underground pipelines, etc. [0003] Water-absorbing swellable polyurethane elastomer is made of hydrophilic polyether polyol soft segment and diisocyanate, chain extender, etc. unit, after absorbing water, the structure shows that the polyether molecular chain changes from a highly entangled state to a chain stretched state. The soft segment and the hard segment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/28C08G18/48C08G18/67
CPCC08G18/6795C08G65/2606C08G65/2609C08G65/2615C08G65/2696
Inventor 荆晓东
Owner 荆晓东
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