A kind of polyurea paint formula and the polyurea paint prepared by it
A coating and polyurea technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of high price, pigment wetting and lack of decoration, and achieve high cross-linking density, excellent adhesion, and good impact resistance The effect of toughness
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Embodiment 1
[0032] 1) Preparation of component A
[0033] The first step is to prepare a prepolymer according to the molar ratio of functional groups -NCO / -OH=2:1: add 1.2mol H12MDI to a 4-necked bottle, stir and blow nitrogen and heat up to 45°C, add 0.6mol in batches with a water content lower than 0.05% 2,4-diethyl-1,5-pentanediol, after reacting for 4 hours between 45°C and 65°C, continuously measure the NCO content, stop the reaction and cool down when the change in NCO mass percentage is ≤0.05%, and use The DBE with a water content of less than 0.05% adjusts the viscosity and makes the solid content 75%. The obtained prepolymer is a colorless transparent liquid with a viscosity of 980mPa·s / 45°C and NCO=9.15%, sealed for use.
[0034] The second step is to prepare component A according to the molar ratio of functional groups -NH- / -NCO=2:1: add 1.2mol DesmophenNH1420 to a 4-neck bottle, stir nitrogen and raise the temperature to 45°C, add 0.6mol of the first step synthesized in batche...
Embodiment 2
[0044] 1) Preparation of component A
[0045] The first step is to prepare a prepolymer according to the molar ratio of functional groups -NCO / -OH=2:1: add 1.2mol IPDI to a 4-necked bottle, stir and blow nitrogen and heat up to 45°C, add 0.6mol in batches with a water content lower than 0.05% 2-ethyl-1,3-hexanediol, after reacting for 4 hours between 45°C and 65°C, continuously measure the NCO group content, stop the reaction when the change of NCO mass percentage is ≤0.05%, and use The DBE below 0.05% adjusts the viscosity and makes the solid content 75%. The obtained prepolymer is a colorless transparent liquid with a viscosity of 1030mPa·s / 45°C and NCO=10.50%, sealed for use.
[0046] The second step is to prepare component A according to the molar ratio of functional groups -NH- / -NCO=2:1: add 1.2mol DesmophenNH1520 to a 4-neck bottle, stir and blow nitrogen and raise the temperature to 45°C, add 0.6mol of the first step synthesized in batches The viscosity of the prepolym...
Embodiment 3
[0056] 1) Preparation of component A
[0057] The first step is to prepare a prepolymer according to the molar ratio of functional groups -NCO / -OH=2:1: add 1.2mol IPDI to a 4-necked bottle, stir and blow nitrogen and heat up to 45°C, add 0.6mol in batches with a water content lower than 0.05% 1,4-butanediol, after reacting for 4 hours between 45°C and 65°C, continuously measure the NCO group content. When the change of NCO mass percentage is ≤0.05%, the reaction is stopped and the temperature is lowered, and the water content is lower than 0.05%. Adjust the viscosity with DBE and make the solid content to 75%. The obtained prepolymer is a colorless transparent liquid with a viscosity of 1180mPa·s / 45°C and NCO=11.68%. It is sealed for use.
[0058] The second step is to prepare component A according to the molar ratio of functional groups -NH- / -NCO=2:1: add 1.2mol DesmophenNH1520 and an appropriate amount of DBE with a water content of less than 0.05% in a 4-necked bottle, stir...
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