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Polyether modified organosilicon polymer and preparation method and application thereof

A polyether modification, silicone technology, applied in the direction of polyether adhesives, adhesive types, adhesives, etc., can solve the problems of high chloride ion content, poor temperature resistance, and many by-products, and achieve high yields , Improve heat resistance and tensile properties, the effect of mild conditions

Active Publication Date: 2022-01-11
江西晨光新材料股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commonly used chain extender is dichloromethane. After using alkali metal alkoxide or sodium / potassium hydroxide to form -O-M, and then remove MCl with dichloromethane to achieve the chain extension effect. This method is due to the introduction of alkaline substances to obtain silane The color of the modified polyether is relatively dark, and MCl is difficult to completely remove in the polyether chain system, resulting in a high content of chloride ions in the silane-modified polyether, resulting in deviations in the quality of the polyether
The chain extenders in other studies are small molecule alcohols containing divalent or polyhydric hydroxyl groups, amino-containing, imino compounds, or ether alcohols. These chain extenders are all small molecule compounds, which are easy to remove from the system, but the chain extenders When there are many by-products, and the chain itself is short and the temperature resistance is poor, it only has the effect of chain extension but cannot improve the heat resistance of polyether

Method used

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  • Polyether modified organosilicon polymer and preparation method and application thereof

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Embodiment 1

[0026] The embodiment of the present invention provides the preparation and application of a polyether modified silicone polymer, comprising the following steps:

[0027] 1) A-PPG-[Si(CH 3 ) 2 Synthesis of O]-PPG-A

[0028] Under the protection of nitrogen, 10g hydrogen-containing double-capped head and the first Pt catalyst (the consumption of the first Pt catalyst makes the Pt consumption in the reaction system be step 1) 20ppm of the total amount of reaction raw materials) and auxiliary agent A boron trifluoride diethyl ether (The molar ratio of boron trifluoride diethyl ether to the molar ratio of Pt in the first Pt catalyst is 1.5:1) Activated at 20°C for 1.5h, added dropwise 73.5g of double-end allyl-terminated polypropylene glycol, and added it to Heat the reaction at about 70°C for 3 hours, cool down, remove excess hydrogen-containing double-heads and other impurities, and obtain A-PPG-[Si(CH 3 ) 2 O]-PPG-A, the test iodine value is 47.3.

[0029] Wherein, the fir...

Embodiment 2

[0033] The method provided in this example is the same as that in Example 1, the only difference is that the double-terminal hydrogen-containing silane compound in the present invention is terminal hydrogen-containing silicone oil with a hydrogen content of 0.17-0.19%.

Embodiment 3

[0035] The method provided in this example is the same as that in Example 1, the only difference being that the double-terminal hydrogen-containing silane compound in the present invention is a terminal hydrogen-containing silicone oil with a hydrogen content of 0.11-0.13%.

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Abstract

The invention provides a polyether modified organosilicon polymer and a preparation method and application thereof. The preparation method of the polyether modified organosilicon polymer comprises the following steps of: S1, carrying out hydrosilylation chain extension reaction on double-end allyl terminated polypropylene glycol and a double-end hydrogen-containing silane compound under the action of a first Pt catalyst to obtain macromolecular double-end allyl terminated polypropylene glycol ether; and S2, carrying out hydrosilylation reaction on the macromolecular double-end allyl terminated polypropylene glycol ether obtained in the step S1 and trimethoxy hydrogen-containing silane under the action of a second Pt catalyst to obtain the polyether modified organosilicon polymer. The polyether modified organosilicon polymer provided by the invention is prepared by adopting two-step hydrosilylation reaction in a specific sequence, and is mild in condition, high in yield, free of byproducts, economical and environment-friendly.

Description

technical field [0001] The invention relates to the technical field of sealant synthesis, more specifically, to a polyether-modified organosilicon polymer and its preparation method and application. Background technique [0002] Silane-modified polyether sealants are prepared from polyether polyols. At present, the molecular weight of polyether polyols in the domestic market is 400-4000. Only a few companies such as Asahi Glass in Japan can directly prepare polyethers with molecular weights above 18,000. High molecular weight polyethers usually need to use low molecular weight polyether polyols to extend the chain to meet the requirements of polyether adhesives on the molecular weight and strength of the base adhesive during application. The commonly used chain extender is dichloromethane. After using alkali metal alkoxide or sodium / potassium hydroxide to form -O-M, and then remove MCl with dichloromethane to achieve the chain extension effect. This method is due to the intr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/46C08G65/336C09J183/12C09J171/02
CPCC08G77/46C08G65/336C09J183/12C09J171/02
Inventor 梁秋鸿丁冰杨静周俊杨超蔡浩
Owner 江西晨光新材料股份有限公司
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