Single-component polyurethane adhesive and preparation method thereof
A polyurethane adhesive, one-component technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of yellowing resistance, no toughness, poor UV resistance, etc., and prolong the service life. , to meet the water resistance, improve the effect of bond strength
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[0030] Example 1
[0031] S1. Put 13 parts of hydroxy silicone oil, 15 parts of polycarbonate diol and 35 parts of trifunctional polyether polyol into the reaction stick, stir and heat up to 105°C, keep it warm and vacuum for 55 minutes, and then reduce the temperature to 57 after the moisture is less than 0.025% ℃, then add 7 parts of chain extender and stir evenly;
[0032] S2. After stirring uniformly, add 0.0225 parts of catalyst. The above catalyst is added in 3 times with an interval of 4 minutes each time. At the same time, the reaction temperature is controlled and the temperature is controlled at 55°C;
[0033] S3. Slowly add 45 parts of HDI monomer dropwise to the reaction kettle, control the temperature at 65℃ and react for 45 minutes, then increase the temperature to 75℃ and react for 45 minutes, and finally increase the temperature to between 85℃ After reacting for 45 minutes, after all the HDI monomer is added dropwise, control the temperature at 83°C and keep it warm ...
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[0036] Example 2
[0037] S1. Put 10 parts of hydroxy silicone oil, 10 parts of polycarbonate diol and 30 parts of trifunctional polyether polyol into the reaction stick, stir and raise the temperature to 100°C, keep it warm and vacuum for 50 minutes, and then lower the temperature to 55 after the moisture is less than 0.02% ℃, then add 5 parts of chain extender and stir evenly;
[0038] S2. After stirring evenly, add 0.015 parts of catalyst. The above catalyst is added in 3 times with an interval of 3 minutes each time. At the same time, the reaction temperature is controlled and the temperature is controlled at 50°C;
[0039] S3. Slowly add 40 parts of HDI monomer dropwise to the reaction kettle, and control the temperature at 60°C for 45 minutes. After all the HDI monomer is added dropwise, the temperature is raised to 70°C for 45 minutes. Finally, the temperature is raised to 80°C and reacted for 45 minutes, the temperature is controlled between 80°C, and the temperature is kept...
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[0042] Example 3
[0043] S1. Put 15 parts of hydroxy silicone oil, 20 parts of polycarbonate diol and 40 parts of trifunctional polyether polyol into the reaction stick, stir and heat up to 110°C, keep it warm and vacuum for 60 minutes, and then cool down to 60 minutes after the moisture is less than 0.03% ℃, then add 10 parts of chain extender and stir evenly;
[0044] S2. After stirring evenly, add 0.03 parts of the catalyst. The above catalyst is added in 3 times with an interval of 5 minutes each time. At the same time, the reaction temperature is controlled and the temperature is controlled at 60°C;
[0045] S3. Add 50 parts of HDI monomer slowly and dropwise into the reaction kettle, control the temperature at 70℃ for 45 minutes, then increase the temperature to 80℃ for 45 minutes, and finally increase the temperature to between 90℃ After reacting for 45 minutes, after all the HDI monomers are added dropwise, the temperature is controlled between 83-85°C and kept for three ho...
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