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A kind of synthetic method of polyether for low modulus sealant

A synthesis method and sealant technology, applied in the directions of polyether adhesives, adhesives, adhesive types, etc., can solve the problems of reducing the elastic modulus and modifying the high modulus of the sealant, so as to reduce the elastic modulus and improve the quality of the sealant. Tensile properties, the effect of increasing tensile elasticity

Active Publication Date: 2021-12-03
ZHEJIANG HUANGMA TECH +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiencies in the prior art, the purpose of the present invention is to provide a synthetic method of polyether for low modulus sealant, the polyether prepared by the present invention can well enhance the rigidity of sealant, and can reduce the Modulus of elasticity, overcomes the problem of high modulus of existing polyether silane modified sealants

Method used

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  • A kind of synthetic method of polyether for low modulus sealant
  • A kind of synthetic method of polyether for low modulus sealant
  • A kind of synthetic method of polyether for low modulus sealant

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preparation example Construction

[0021] A method for synthesizing polyether for low-modulus sealants, comprising the following steps: adding a mixture of monoalcohol polyoxypropylene ether and polyol polyoxypropylene ether and a metal complex catalyst into a reactor, vacuuming, and using N 2 Replace the air in the reaction kettle, when the vacuum degree is ≥ -0.096Mpa, heat up and dehydrate while pumping vacuum, keep warm and dehydrate for 0.5-2h when the temperature rises to 120-130°C; add propylene oxide to react, the reaction temperature is 100-180°C , The pressure in the reactor is -0.05~0.40Mpa, keep warm and continue the reaction until the pressure no longer drops; after the reaction is completed, vacuum degassing, when the vacuum degree is ≥-0.098Mpa, keep it for 10-30min, and after cooling down, the molecular weight is 4000~ 30,000 polyether for the low modulus sealant.

[0022] Concrete reaction formula is as follows:

[0023]

[0024] In the above method, the weight ratio of the monoalcohol pol...

Embodiment 1

[0028] In a 2.5L high-pressure stirred reactor, adding molecular weight is 400 propylene glycol polyoxypropylene ether 92g and molecular weight is 300 butanol polyoxypropylene ether 8g and double metal complex catalyst DMC 0.026g, vacuumize with vacuum pump, adopt N 2 Replace the air in the reactor. After three replacements, under the vacuum degree ≥ -0.096MPa, heat up and dehydrate while vacuuming. When the temperature is 120°C, keep warm and dehydrate for 1 hour. After dehydration, 1175 g of propylene oxide was added. Control the reaction temperature at 110-130°C, and the pressure in the reactor at -0.05-0.40MPa. After the addition, keep warm and continue the reaction until the pressure stops dropping. After the reaction is completed, vacuum degassing, keep the vacuum ≥-0.098MPa for 10 minutes, then cool down and discharge to obtain the polyether product for low modulus sealant.

[0029] Product indicators: The molecular weight of the gel chromatography test is 4980, and th...

Embodiment 2

[0034] In a 2.5L high-pressure stirred reactor, adding molecular weight is 800 glycerol polyoxypropylene ether 115g and molecular weight is 1200 alcohol polyoxypropylene ether 20g and multi-metal complex catalyst MMC 0.060g, vacuumize with vacuum pump, adopt N 2 Replace the air in the reactor. After three replacements, under the vacuum degree ≥ -0.096MPa, heat up and dehydrate while vacuuming. When the temperature rises to 120°C, keep warm and dehydrate for 1 hour. After the dehydration is completed, add 1230g of propylene oxide, control the reaction temperature at 120-150°C, and the pressure in the reactor at -0.05-0.40MPa. After the addition, keep warm and continue the reaction until the pressure no longer drops. After the reaction is completed, vacuum degassing, when the vacuum degree ≥ -0.098MPa is kept for 10 minutes, the temperature is lowered and the material is discharged to obtain the polyether product for low modulus sealant.

[0035] Product indicators: The molecula...

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Abstract

The invention discloses a method for synthesizing polyether for low modulus sealants, and belongs to the technical field of organic compound synthesis. The synthesis method of the present invention mainly uses the mixture of unit alcohol polyoxypropylene ether and polyol polyoxypropylene ether as an initiator, uses propylene oxide as a chain extender, and adds a metal complex catalyst for reaction, and the reaction is completed to obtain the Polyether for low modulus sealants. The polyether prepared by the invention can well enhance the rigidity of the sealant and reduce the modulus of elasticity, which overcomes the problem of high modulus of the existing polyether silane modified sealant, and has a simple synthesis process and easy production control , short production cycle and low energy consumption.

Description

technical field [0001] The invention relates to the technical field of organic compound synthesis, in particular to a method for synthesizing polyether for low modulus sealants. Background technique [0002] With the country's increasing emphasis on energy conservation and environmental protection, prefabricated buildings have the advantages of short construction period, low energy consumption, less pollution, and construction safety, making them gradually become one of the main directions of future architectural development. Specifically, compared with traditional concrete buildings, prefabricated buildings can reduce the amount of on-site waste by about 80%, reduce material consumption by nearly 60%, reduce construction personnel by about 90%, and shorten the construction period by about 70%. In the assembly process of prefabricated buildings, there are a large number of joints that need to be waterproofed and sealed, especially the joints of the exterior wall. The sealant...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G65/28C09J171/02
CPCC08G65/2609C08G65/2663C08G65/2645C08G65/2696C09J171/02C09K3/10C08L71/02C09K2200/0662
Inventor 马定连金一丰王新荣刘鹏飞徐杰
Owner ZHEJIANG HUANGMA TECH
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