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A kind of alkoxy-terminated dealcoholized silicone sealant and preparation method thereof

An alkoxy-terminated, silicone technology, used in the field of sealants, can solve problems such as intolerance to storage, and achieve the effects of high end-capping efficiency, mild reaction conditions, and improved storage stability

Active Publication Date: 2015-08-19
西卡(江苏)工业材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main technical problem to be solved by the present invention is to provide an alkoxy-terminated dealcoholized silicone sealant and its preparation method, which can solve the shortcoming of the existing dealcoholized one-component sealant that is not resistant to storage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In parts by weight, 1000g of α,ω-dihydroxy polydimethylsiloxane with a molecular weight of 80,000 was added to a reaction kettle with a heating and stirring device, and 30g of calcium acetylacetonate catalyst and 100g of formazan were added successively under stirring. base trimethoxysilane, stirred and reacted at 80°C for 4h to obtain alkoxy-terminated α,ω-dihydroxypolydimethylsiloxane; then the above-mentioned α,ω-dihydroxypolydimethylsiloxane Carry out vacuum distillation to remove unreacted low boilers, so that the content of low volatile components is less than 0.5%; the purified alkoxy-terminated α, ω-dihydroxy polydimethylsiloxane Put alkanes into the reaction kettle, add 500g of white carbon black and calcium carbonate mixture at the same time, stir and dehydrate in vacuum at 100°C for 2h, then add 50g of vinyltrimethoxysilane, stir in vacuum for 45min, then add 150g of titanate coupling agent and 50 g of a tackifier, stirred in vacuum for 60 minutes, and sealed...

Embodiment 2

[0026] In parts by weight, 1000g of α,ω-dihydroxy polydimethylsiloxane with a molecular weight of 80,000 was added to a reaction kettle with a heating and stirring device, and 50g of platinum acetylacetonate catalyst and 200g of ethylene were added sequentially under stirring. base triethoxysilane, stirred and reacted at 100°C for 1 h to obtain alkoxy-terminated α, ω-dihydroxy polydimethylsiloxane; then the above-mentioned α, ω-dihydroxy polydimethylsiloxane Methylsiloxane is distilled under reduced pressure to remove unreacted low boilers, so that the content of low volatile components is less than 0.5%; the purified alkoxy-terminated α, ω-dihydroxy polydimethylsiloxane Add oxane into the reaction kettle, add 800g of white carbon black and calcium carbonate mixture at the same time, stir and dehydrate in vacuum at 120°C for 1h, then add 100g of methyltrimethoxysilane, stir in vacuum for 30min, add 200g of titanate coupling agent and 80 g of tackifier, stirred in vacuum for 60...

Embodiment 3

[0029] In parts by weight, 1000g of α,ω-dihydroxy polydimethylsiloxane with a molecular weight of 80,000 was added to a reaction kettle with a heating and stirring device, and 50g of zinc acetylacetonate catalyst and 200g of ethylene were added sequentially under stirring. Triethoxysilane, stirred and reacted at 100°C for 2h to obtain alkoxy-terminated α,ω-dihydroxypolydimethylsiloxane; then the above-mentioned α,ω-dihydroxypolydimethylsiloxane Methylsiloxane is distilled under reduced pressure to remove unreacted low boilers, so that the content of low volatile components is less than 0.5%; the purified alkoxy-terminated α, ω-dihydroxy polydimethylsiloxane Add oxane into the reaction kettle, add 600g of white carbon black and calcium carbonate mixture at the same time, stir and dehydrate in vacuum at 120°C for 1.5h, then add 100g of methyltrimethoxysilane, stir in vacuum for 30min, then add 150g of titanate bismuth The joint agent and 80 g of the tackifier were stirred in vac...

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Abstract

The invention discloses an alkoxyl end-capped dealcoholized silicone sealant and a preparation method thereof. The alkoxyl end-capped dealcoholized silicone sealant comprises the following components in parts by weight: 100 parts of alpha, omega-dihydroxyl polydimethylsiloxane, 10-20 parts of an end-capped polymer, 3-5 parts of an end capping catalyst, 15-20 parts of a titanate coupling agent, 50-80 parts of a reinforcing agent, 5-10 parts of a crosslinking agent and 5-8 parts of a tackifier. The alkoxyl end-capped dealcoholized silicone sealant is prepared through the steps of end capping treatment, purification treatment and mixing. The method has the advantages that alkoxyl end capping is performed on a reaction polymer, so that the storage stability of the sealant is enhanced, and the storage time is over 12 months; the conditions of an end capping reaction are mild, the end capping efficiency is high, and continuous production is available; the generated alkoxyl end-capped dealcoholized silicone sealant has excellent mechanical properties, and can meet the requirements of electronic-grade products.

Description

technical field [0001] The invention relates to the technical field of sealants, in particular to an alkoxy-terminated dealcoholized silicone sealant and a preparation method thereof. Background technique [0002] Silicone sealant has deacidification type, dealcoholization type and deketoxime type, among which dealcoholization type sealant has neutral properties, clean, non-toxic, non-corrosive, low cost and price, and adheres to glass and metal and other materials. Good connection performance and other advantages. In recent years, with the rapid development of the electrical and electronic industry, dealcoholized silicone one-component sealant (RTV-1) has been favored by industry applications and researchers because of its above-mentioned performance advantages. However, most of the dealcoholized silicone one-component sealants currently on the market use hydroxyl-terminated silicone as raw materials for preparation, such as 107 silicone oil, α,ω-dihydroxy polydimethylsilo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J183/06C09J11/04C09J11/06C09K3/10C08G77/38
Inventor 陈春浩
Owner 西卡(江苏)工业材料有限公司
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