Polysiloxane modified polyurethane for drillable sand screen and preparation method and application thereof
A technology of polysiloxane and sand filter tubes, which is applied in polyurea/polyurethane adhesives, chemical instruments and methods, earthwork drilling and production, etc., can solve the problems that are difficult to meet the requirements of thermal recovery well operations in horizontal wells, and achieve good results. The effect of elasticity and strength, easy to break, and simple synthesis process
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Embodiment 1
[0029] Co-hydrolyze 104g ethyl orthosilicate, 356g methyltriethoxysilane and 360g vinyltriethoxysilane, then stand to separate layers, take the upper organic phase, dry, remove small molecules, and obtain ethylene-containing base and hydroxyl siloxanes. Dissolve 20 g of butanediol and 6 g of dibutyltin dilaurate in N, N dimethylformamide, add to the prepared siloxane containing vinyl and hydroxyl groups, mix well, then add dropwise from 2 , 20 g of 4-toluene diisocyanate and 14 g of 2,6-toluene diisocyanate are mixed to obtain a mixed monomer, and react at 60° C. for 8 hours, and then, the solvent is distilled off to obtain polysiloxane-modified polyurethane.
[0030] Performance measurement:
[0031] Add 8g of 2.5-dimethyl-2.5-di-tert-butylperoxyhexane to the prepared polysiloxane-modified polyurethane, mix well, pour it into a mold, and vulcanize it in an oven at 80°C for 48 hours. Obtain one-stage vulcanized polysiloxane-modified polyurethane; place the obtained one-stage...
Embodiment 2
[0035] Co-hydrolyze 104g ethyl orthosilicate, 356g methyltriethoxysilane and 360g vinyltriethoxysilane, then stand to separate layers, take the upper organic phase, dry, remove small molecules, and obtain ethylene-containing base and hydroxyl siloxanes. 30g of ethylene glycol and 8g of dibutyltin dilaurate are dissolved in N,N dimethylformamide, added to the prepared siloxane containing vinyl and hydroxyl groups, mixed evenly, and then added dropwise by 2 The mixed monomer obtained by mixing 50g of 4-toluene diisocyanate and 22g of 4,4'-diphenylmethane diisocyanate was reacted at 60°C for 10 hours, and then the solvent was distilled off to obtain the modified polysiloxane permanent polyurethane.
[0036] Performance measurement:
[0037] Add 10g of cumene peroxide to the prepared polysiloxane-modified polyurethane, stir evenly, pour into molding, place in an oven at 80°C, and vulcanize for 24 hours in one stage to obtain a one-stage vulcanized polysiloxane with good elastici...
Embodiment 3
[0041] Co-hydrolyze 104g ethyl orthosilicate, 356g methyltriethoxysilane and 360g vinyltriethoxysilane, then stand to separate layers, take the upper organic phase, dry, remove small molecules, and obtain ethylene-containing base and hydroxyl siloxanes. Butanediol 20g, 12g dibutyltin dilaurate are dissolved in N, N dimethylformamide, join in the siloxane that contains vinyl and hydroxyl that makes, mix well, then add dropwise by 2 12g of 4-toluene diisocyanate, 16g of 2,6-toluene diisocyanate and 8g of 4,4'-diphenylmethane diisocyanate were mixed to obtain a mixed monomer, and the reaction was carried out at 60°C for 8 hours, and then the solvent was evaporated out to obtain polysiloxane-modified polyurethane.
[0042] Performance measurement:
[0043] Add 4g of di-tert-butyl peroxide to the prepared polysiloxane-modified polyurethane, stir evenly, pour into molding, place in an oven at 80°C, and vulcanize for 24 hours in one stage to obtain a one-stage vulcanized polysiloxane...
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