Double-component polyurethane sealant for construction
A two-component polyurethane and sealing paste technology, which is applied in the direction of adhesive additives, non-polymer adhesive additives, polymer adhesive additives, etc., can solve problems such as poor alkali and water resistance, and achieve good adhesion , small shrinkage, excellent aging resistance
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Embodiment 1
[0018] Two-component polyurethane building sealant is made from two components A and B, each component is made from the following raw materials by weight:
[0019]
[0020]
[0021] Component A and component B are mixed evenly in a proportion of 1:1.1, and the construction can be done.
[0022] The relative molecular mass of the polyoxyethylene ether is 3700; the relative molecular mass of the polyalkyl ether triol is 4500.
[0023] The preparation method of component B is as follows: adding polyoxyethylene ether, polyalkyl ether trivalent alcohol, dibutyl phthalate, dioctyl phthalate and polyglyceryl ester according to the above ratio in the reaction kettle, heating up and stirring , then add polytetrafluoroethylene, carbon black and sodium silicate in turn, heat up to 90 ℃, turn on the vacuum pump for dehydration, maintain the vacuum above 520mm mercury column, stir and dehydrate for more than 1 hour, cool down to 80 ℃, then add aluminum sulfate and chloride Iron, con...
Embodiment 2
[0025] Two-component polyurethane building sealant is made from two components A and B, each component is made from the following raw materials by weight:
[0026]
[0027] Component A and component B are mixed evenly in a proportion of 1:1.2, and the construction can be done.
[0028] The relative molecular mass of the polyoxyethylene ether is 4100; the relative molecular mass of the polyalkyl ether triol is 5300.
[0029] The preparation method of component A is as follows: add each component in the reaction kettle according to the above proportions and stir, heat up to 90°C for reaction for 2 hours to synthesize, and then cool down to below 45°C for discharging and packaging.
[0030] The preparation method of component B is as follows: adding polyoxyethylene ether, polyalkyl ether trivalent alcohol, dibutyl phthalate, dioctyl phthalate and polyglyceryl ester according to the above ratio in the reaction kettle, heating up and stirring , then add polytetrafluoroethylene,...
Embodiment 3
[0032] Two-component polyurethane building sealant is made from two components A and B, each component is made from the following raw materials by weight:
[0033]
[0034] Component A and component B are mixed evenly in a proportion of 1:1.4, and the construction can be done.
[0035] The relative molecular mass of the polyoxyethylene ether is 4500; the relative molecular mass of the polyalkyl ether triol is 4900.
[0036] The preparation method of component B is as follows: adding polyoxyethylene ether, polyalkyl ether trivalent alcohol, dibutyl phthalate, dioctyl phthalate and polyglyceryl ester according to the above ratio in the reaction kettle, heating up and stirring , then add polytetrafluoroethylene, carbon black and sodium silicate in turn, heat up to 90 ℃, turn on the vacuum pump for dehydration, maintain the vacuum above 520mm mercury column, stir and dehydrate for more than 1 hour, cool down to 80 ℃, then add aluminum sulfate and chloride Iron, continue to sti...
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