Polyurethane sealant with weather resistance and preparation method of polyurethane sealant
A polyurethane sealant and weather resistance technology, applied in the field of sealant, can solve the problems of poor use effect, photooxidative aging, high stress, etc., and achieve the effect of slow mechanical property decay, excellent yellowing resistance, and good elasticity
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Example Embodiment
Specific Example 1
[0036] (1) First make isocyanate resin A
[0037] Dehydrate 85% by weight of polyether polyol under vacuum at 130°C for 3 hours and cool to 85°C with 15% diphenylmethane diisocyanate at 85°C for 5 hours to produce 1.8~2.4% NCO The isocyanate resin A;
[0038] (2) Making isocyanate resin B
[0039] The isocyanate resin B is produced by 88% by weight polyether polyol dehydrated under a vacuum of 130 degrees for 3 hours and cooled to 85 degrees with 12% isophorone diisocyanate reacted at 85 degrees for 4 hours. Isocyanate resin B containing 1.8~2.2% NCO;
[0040] (3) 25% isocyanate resin A, 10% isocyanate resin B, 10% anti-migration plasticizer, 4.5% epoxy soybean oil, 6% high-pressure polyethylene, 10% PVC are weighed according to the following ratio Resin paste and 25% nanometer calcium carbonate flow into the twin-screw disperser at a uniform speed for homogeneous dispersion. The dispersed materials enter the cooling system to reduce the materials to below 35 deg...
Example Embodiment
Specific Example 2
[0041] The difference from Embodiment 1 is that the ratio of the composition used in step 3 is different.
[0042] Step 3 of this specific embodiment is as follows:
[0043] (3) 20% isocyanate resin A, 12% isocyanate resin B, 11% anti-migration plasticizer, 4% epoxy soybean oil, 5% high pressure polyethylene, 11% PVC are weighed according to the following ratio The resin paste and 30% nano calcium carbonate flow into the twin-screw disperser at a uniform speed for homogeneous dispersion. The dispersed materials enter the cooling system to reduce the materials to below 35 degrees. After entering the static mixer, a certain amount of 0.4% Oxygen 1010, 0.4% antioxidant TNP, 0.9% ultraviolet absorber, 2% zinc oxide, 2% carbon black, 0.8% UV-R (2-(2′-Xiang group-5′-methylphenyl ) Benzotriazole), 0.5% organotin catalyst is added to the cooled material and fully dispersed to obtain weather-resistant polyurethane sealant.
Example Embodiment
Specific Example 3
[0044] The difference from specific example 1 is that the proportion of the composition used in step 3 is different.
[0045] Step 3 of this specific embodiment is as follows:
[0046] (3) 30% isocyanate resin A, 9% isocyanate resin B, 8% anti-migration plasticizer, 5% epoxy soybean oil, 7% high pressure polyethylene, 9% PVC are weighed according to the following ratio The resin paste and 20% nano calcium carbonate flow into the twin-screw disperser at a uniform speed for homogeneous dispersion. The dispersed materials enter the cooling system to reduce the materials to below 35 degrees. After entering the static mixer, a certain amount of 0.5% resistance Oxygen 1010, 0.5% antioxidant TNP, 1.2% ultraviolet absorber, 4% zinc oxide, 4% carbon black, 1.2% UV-R(2-(2′-Xiang group-5′-methylphenyl ) Benzotriazole), 0.6% organotin catalyst is added to the cooled material and fully dispersed to obtain weather-resistant polyurethane sealant.
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