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Polyether with controllable silicon content and preparation method and application thereof

A silicon content, polyether technology, applied in polyether adhesives, adhesive types, adhesives, etc., can solve problems such as insufficient sealing performance, and achieve the effect of excellent bonding performance

Active Publication Date: 2019-02-01
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The performance of the sealant obtained through this formula has been improved, but the problem of insufficient sealing performance still exists

Method used

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  • Polyether with controllable silicon content and preparation method and application thereof
  • Polyether with controllable silicon content and preparation method and application thereof
  • Polyether with controllable silicon content and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0069] The design structure of this embodiment (1) has a molecular weight of 5000, wherein PO units (78.9mol) account for 92.1% of the total monomer mass, and 1,2-epoxy-5-hexene (4mol) is used as a special monomer, accounting for the total monomer mass. 7.90% of the body weight, the theoretical hydroxyl value is 11.2 mgKOH / g, and the theoretical unsaturation is 0.8 mmol / g; the theoretical end-capping rate is 100% with methoxyl capping; the theoretical unsaturation of hydrosilylation is 0 mmol / g g. As the silane, dimethoxymethylhydrogensilane is used.

[0070] Add 3.2g of methanol to a 1L kettle as a starter, add 0.5g (0.1%) of catalyst sodium methoxide, replace with nitrogen, reduce the pressure to -0.1MPa, raise the temperature to 100°C to remove the water generated by the reaction for 1.5h; raise the temperature To 110°C, the mass of propylene oxide monomer required is calculated to be 457.5g, and the mass of 1,2-epoxy-5-hexene functional monomer required is 39.26g. After m...

Embodiment 2

[0075] The design structure of this embodiment (1) has a molecular weight of 8000, wherein PO units (123.33mol) account for 90.12% of the total monomer mass, and 1,2-epoxy-5-hexene (8mol) is used as a special monomer, accounting for the total monomer mass. 9.89% of the body weight, the theoretical hydroxyl value is 14.03 mgKOH / g, and the theoretical unsaturation is 1 mmol / g. The theoretical hydroxyl value is 0 mgKOH / g for methoxy end-capping, and the theoretical degree of unsaturation by hydrosilylation is 0 mmol / g. As the silane, dimethoxymethylhydrogensilane is used.

[0076] Add 6.2g of ethylene glycol into a 1L kettle as a starting agent, add 0.8g (0.1%) of catalyst sodium methoxide, replace with nitrogen, reduce the pressure to -0.1MPa, and raise the temperature to 100°C to remove the water generated by the reaction for 1.5h; High temperature to 110°C, calculate the required mass of propylene oxide monomer to be 715.2g, the required mass of 1,2-epoxy-5-hexene functional ...

Embodiment 3

[0081] The design structure of this embodiment (1) has a molecular weight of 10000, wherein PO units (78.9mol) account for 90.77% of the total monomer mass, and allyl glycidyl ether (8mol) is used as a special monomer, accounting for 9.23% of the total monomer mass. The theoretical hydroxyl value is 11.22 mgKOH / g, and the theoretical unsaturation is 0.8 mmol / g. The theoretical hydroxyl value is 0 mgKOH / g for methoxy end-capping, and the theoretical degree of unsaturation by hydrosilylation is 0 mmol / g. As the silane, trimethoxyhydrosilane was used.

[0082] Add 10.4 g of neopentyl glycol into a 1 L kettle as an initiator, add 1 g (0.1%) of catalyst sodium methoxide, replace with nitrogen, reduce the pressure to -0.1 MPa, and raise the temperature to 100° C. to remove the water generated by the reaction for 1.5 h; High temperature to 110°C, calculate the required mass of propylene oxide monomer to be 898.26g, the required mass of allyl glycidyl ether functional monomer to be 9...

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Abstract

The invention discloses modified polyether with controllable silicon content and a preparation method thereof and an application thereof of polyether as a sealant. According to the invention, monohydric alcohol or dihydric alcohol are used as a starting agent, an unsaturated bond-containing epoxy structural monomer and conventional polyether synthesis monomer are used, a compound having one or more double bonds is firstly synthesized, and after a methoxy group is used for terminating, a hydrosilylation is carried out to obtain the silicon-modified polyether with the controlled silicon content.The method adopts the conventional hydrosilylation and a stepwise polymerization reaction, and the provided synthesis steps are simple and easy to realize, and the method has high yield; the composition of the traditional sealant is changed from the source, and the obtained product has excellent characteristics of bonding properties, weather resistance, durability and mechanical properties (hightear strength, breaking strength and modulus, moderate elongation at break and hardness), and can achieve different use ranges by controlling the structure of the polyether.

Description

technical field [0001] The invention relates to a silicon-modified polyether with thyristor content and its preparation method and application Background technique [0002] The traditional polyurethane sealant contains free isocyanate, which does not conform to the environmental protection concept of our country, and it is easy to form bubbles when curing, so its application in many fields is limited; and the silicone sealant is low in tear strength, poor in paintability, easy to Pollution building materials, its application is also subject to certain restrictions. The silane-modified polyether sealant that emerged at the historic moment overcomes the shortcomings of the two and has both advantages, which is the main development direction of the sealant at present. [0003] Most of the silane-modified polyether sealants currently on the market are made of alkoxy-terminated polyether as raw materials, adding a certain proportion of reinforcing fillers, plasticizers, water re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/336C08G65/28C09J171/02
CPCC08G65/2609C08G65/336C09J171/02
Inventor 殷玲鞠昌迅秦承群王明永叶天刘洋李付国石正阳黎源华卫琦
Owner WANHUA CHEM GRP CO LTD
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