Highly cross-linked polyurea elastomer and preparation method thereof
A polyurea elastomer, highly cross-linked technology, used in polyurea/polyurethane coatings, coatings, anti-corrosion coatings, etc. The effect of high heat resistance, water resistance and corrosion resistance
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Embodiment 1
[0022] 1000g of hydroxyl-terminated polybutadiene (molecular weight: 500-600) and 750g of MDI are heated under the condition of pure nitrogen, using organotin catalyst, heated at 60-70°C, and stirred for 3-4 hours to obtain the isocyanate-terminated prepolymer containing double bonds. material, the isocyanate content is about 2.7%, as the A component.
[0023] Stir 800g of amino-terminated polyether D2000, 240g of amino-terminated polyether D5000, 8g of dimethylthiotoluenediamine, 17g of benzoyl peroxide, and 15g of N,N-dimethylaniline. Then add 150g of dehydrated zinc oxide and 10g of tetrafluoroethylene powder, stir and mix evenly, as component B.
[0024] Components A and B use special spray guns for polyurea, and the spraying pressure is 0.7-0.8MPa. After spraying and molding, continue to cure at room temperature for 24-36 hours or heat at 70-80°C for 2-3 hours to obtain highly cross-linked polyurea elastomers .
Embodiment 2
[0026] 1000g of hydroxyl-terminated polybutadiene (molecular weight is about 40000, hydroxyl value 0.48mmol / g) and 60g of IPDI are heated at 70-80°C with organic tin catalyst under the protection of pure nitrogen, and stirred for 5-6 hours to obtain isocyanate-terminated A prepolymer containing double bonds with an isocyanate content of about 6.2% as the A component.
[0027] Mix 600g polyaspartate (amine value 190-210mgKOH / g), 120g amino-terminated polyether D5000, 8g benzoyl peroxide, 6g N,N-dimethylaniline, 6g cyclohexanone peroxide, 5g Cobalt naphthenate, stir well. Then add 150g of dehydrated zinc oxide and 10g of tetrafluoroethylene powder, stir and mix evenly, as component B.
[0028] Components A and B use special spray guns for polyurea, and the spraying pressure is 0.7-0.8 MPa. After spraying into sheets, continue to cure at room temperature for 24-36 hours or heat at 70-80°C for 2-3 hours to obtain highly cross-linked polyurea elastomer.
[0029] It is also possi...
Embodiment 3
[0031] 1000g of hydroxyl-terminated polybutadiene acrylonitrile (molecular weight 800-1000) and 300g of TDI were heated at 70-80°C with organic tin catalyst under pure nitrogen protection conditions, and stirred for 3-4 hours to obtain isocyanate-terminated double bond-containing Prepolymer, with an isocyanate content of approximately 3.9%, as the A component.
[0032] 800g amino-terminated polyether D2000, 240g amino-terminated polyether D5000, 8g dimethylthiotoluenediamine, 6g benzoyl peroxide, 5g N,N-dimethylaniline, 5g cyclohexanone peroxide, 4g cyclohexanone Cobalt alkanoate, stir well. Then add 150g of dehydrated zinc oxide and 10g of tetrafluoroethylene powder, stir and mix evenly, as component B.
[0033] Components A and B use special spray guns for polyurea, and the spraying pressure is 0.7-0.8MPa. After spraying and molding, continue to cure at room temperature for 24-36 hours or heat at 70-80°C for 2-3 hours to obtain highly cross-linked polyurea elastomers .
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