Alkoxyl end-capped 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, improved storage stability, and mild reaction conditions
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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
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