High-elasticity polyurethane modified epoxy-silicone ablation resistance paint
A technology for modification of epoxy silicone and polyurethane, applied in polyurea/polyurethane coatings, coatings, etc. Process and other issues, to meet the needs of ablation, excellent thermal stability, and reduce production costs
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[0035] Example 1.
[0036] Add 240g of phenyltriethoxysilane and 544g of diphenyldiethoxysilane to the three-necked reaction flask, start stirring, and evenly drop 21g of water into the reaction flask with a dropping funnel, control the reaction temperature to 38°C for about 1h The addition is completed. Incubate for 0.5h. Heat up to 80°C. After the ethanol generated by the reaction reaches 88g, the temperature is raised to 133°C for 1.5h. After 1.5h, the amount of ethanol collected is 108g, and the temperature is lowered to 60°C to obtain an ethoxy group content of 30.3% and a refractive index D20: 1.512 of the silicone intermediate. 697g of organosilicon intermediate, 1162g of cyclohexanone, 581g of xylene, and 1046g of E-20 epoxy resin were put into a three-necked reaction flask in turn, and the temperature was slowly increased. After 6 hours of heat preservation, samples were taken to measure the gelation time of the resin. When the gelation time was 2min at 250°C, the t...
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[0045] Example 2
[0046] Add 240g of phenyltriethoxysilane and 440g of phenylmethyldiethoxysilane to the three-necked reaction flask, start stirring, and evenly drop 31g of water into the reaction flask with a dropping funnel, and control the reaction temperature to 38°C, about 1h dropwise addition was completed. Incubate for 0.5h. Heat up to 80°C. After the ethanol generated by the reaction reaches 130g, the temperature is raised to 133°C for 1.5h. After 2h, the amount of ethanol collected is 158g, and the temperature is lowered to 60°C to obtain an ethoxy group content of 30.3% and a refractive index D20: 1.512 of silicone intermediates. 553g of organosilicon intermediate, 939g of cyclohexanone, 444g of xylene, and 830g of E-20 epoxy resin were put into a three-necked reaction flask successively, and the temperature was slowly increased. After holding for 5.5 hours, take samples to measure the gelation time of the resin. When the gelation time is 2 minutes at 250°C, the t...
Example Embodiment
[0055] Example 3.
[0056] Add 240g of phenyltriethoxysilane and 297g of dimethyldiethoxysilane to the three-necked reaction flask, start stirring, and evenly drop 40.8g of water into the reaction flask with a dropping funnel, control the reaction temperature to 37°C for about 1h The addition is completed. Incubate for 0.5h. Heat up to 80°C. After the ethanol generated by the reaction reaches 170g, it takes 1.5h to raise the temperature to 133°C. After 2h, the amount of ethanol collected is 206g, and the temperature is lowered to 60°C to obtain an ethoxy group content of 30.1% and a refraction D20 of 1.511. of silicone intermediates. 372g of organosilicon intermediate, 613g of cyclohexanone, 307g of xylene, and 552g of E-20 epoxy resin were put into a three-necked reaction flask in turn, and the temperature was slowly increased. After holding for 6 hours, take samples to measure the gelation time of the resin. When the gelation time is 1.5min at 250°C, the temperature is low...
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