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Platinum catalyst used in liquid silicone rubber catalysis, and preparation method and application thereof

A technology of liquid silicone rubber and platinum catalyst, which is applied in the fields of chemical instruments and methods, organic chemistry, and compounds containing elements of group 8/9/10/18 of the periodic table, etc. Problems such as poor stability of the catalytic system to achieve good storage stability

Inactive Publication Date: 2014-11-19
浙江恒业成有机硅有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of poor stability and difficult control of the reaction activity of the existing catalytic system, the present invention provides a platinum hydrosilylation catalyst with controllable catalytic activity. Sufficient operation time can ensure fast curing and good mechanical strength in the later stage

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0025] Example 1: Using isopropanol as the reaction solvent, after feeding and mixing uniformly according to the molar ratio of chloroplatinic acid and tetramethyldivinyldisiloxane of 1:2, add sodium bicarbonate and react at 80°C for 3h; temperature After lowering to 40°C, feed 3,5-dimethyl-1-ethyn-3 alcohol at a molar ratio of 1:2 between chloroplatinic acid and 3,5-dimethyl-1-ethyn-3 alcohol, and react for 3 hours. Filter off the solid matter, slowly increase the temperature and reduce pressure to remove the low boiling matter, add polysiloxane with a molecular weight of 5000, and mix evenly to prepare the platinum complex 1.

Embodiment 2

[0026] Example 2: Using isopropanol as the reaction solvent, after feeding and mixing uniformly according to the molar ratio of chloroplatinic acid and tetramethyldivinyldisiloxane of 1:3, add sodium bicarbonate and react at 80°C for 3h; temperature After lowering to 40°C, feed ethynyl cyclohexanol according to the molar ratio of chloroplatinic acid to ethynyl cyclohexanol 1:1, and react for 3 hours. Filter off the solid matter, slowly increase the temperature and reduce pressure to remove the low boiling matter, add polysiloxane with a molecular weight of 5000, and mix evenly to prepare the platinum complex 2.

Embodiment 3

[0027] Example 3: Using 1,3-propanediol as the reaction solvent, mix chloroplatinic acid and tetramethyltetravinylcyclotetrasiloxane evenly at a molar ratio of 1:2, add sodium bicarbonate, and react at 100°C 2h; after the temperature is lowered to 40°C, feed 3,5-dimethyl-1-ethyn-3 alcohol at a molar ratio of 1:2 between chloroplatinic acid and 3,5-dimethyl-1-ethyn-3 alcohol, and react for 3 hours . Filter off the solid matter, slowly increase the temperature and reduce pressure to remove the low boiling matter, add polysiloxane with a molecular weight of 5000, and mix evenly to prepare the platinum complex 3.

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PUM

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Abstract

The invention relates to a controllable-activity platinum catalyst used in liquid silicone rubber catalysis, and a preparation method and an application thereof. The catalyst has the general structural formula of Pt(VX)n(AY)4-n, wherein VX is one or a complex of various siloxane compounds with vinyl; AY is one or a complex of various organic compounds with alkynyl; and n is 1-3. The platinum catalyst used in liquid silicone rubber catalysis is used in the field of liquid silicone rubber. The activity of the catalyst is controllable, such that a rubber material has enough operation time during mixing and application. Also, at a late stage, silicone rubber vulcanization molding can be catalysed fast. The catalyst has good storage stability in liquid silicone rubber. The catalytic activity can maintain unchanged for a long time.

Description

technical field [0001] The invention belongs to the field of organosilicon materials, and in particular relates to a platinum catalyst for liquid silicone rubber with controllable catalytic activity, a preparation method and application thereof. Background technique [0002] If the hydrosilylation reaction is to be carried out rapidly, as long as the catalyst activity is high, the reaction can be carried out rapidly, but if the catalyst activity is too high, the operation time will be too short, resulting in very inconvenient production, especially for liquid rubber. However, if the activity of the catalyst is very low, it is also unfavorable to the reaction, and the rubber material is scorched before the addition reaction, so the processing is difficult, and even if it can be processed, the performance is not stable. Therefore, there are certain requirements for the activity of the catalyst. Generally, the catalyst is required to hardly react before reaching the vulcanizati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08K5/5415C09D183/04C09D7/12C07F15/00
Inventor 赵海洋孟繁茹吴忆南
Owner 浙江恒业成有机硅有限公司
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