A preparation method for an environmentally-friendly anti-yellowing curing agent with a good adhesive force
An environmentally friendly curing agent, anti-yellowing technology, applied in adhesive additives, non-polymer adhesive additives, coatings, etc., can solve the problems of low surface tension, high production cost, long production cycle, etc. Excellent adhesion, no need for equipment investment, good effect of yellowing and weathering resistance
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Embodiment 1
[0020] Add 90g of toluene diisocyanate into a four-necked flask with a condenser and nitrogen protection, add 250g of ethyl acetate, start stirring, add 15g of diethylene glycol, keep it at 50-55°C for 1 hour, add 100g of HDI, 30gTMP, add 10g trimethylsilanol, react at 75°C for 2h, add 0.5g trimerization catalyst after reaction, trimerize at 60°C, detect NCO content every 1h, when the total NCO content drops to 8.5%, Cool down and add 0.5g benzoyl chloride polymerization inhibitor to terminate the reaction, cool down and discharge.
Embodiment 2
[0022] Add 90g of toluene diisocyanate into a four-neck flask with a condenser and nitrogen protection, add 270g of ethyl acetate, start stirring, add 14g of butanediol, keep it at 50-55°C for 1 hour, add 120g of HDI, 33gTMP, add 8g trimethylsilanol, react at 75°C for 2h, add 0.5g trimerization catalyst after reaction, trimerize at 60°C, detect NCO content every 1h, when the total NCO content drops to 8.5%, Cool down and add 0.5g phosphoric acid polymerization inhibitor to terminate the reaction, cool down and discharge.
Embodiment 3
[0024] Add 95g of toluene diisocyanate into a four-necked flask with a condenser and nitrogen protection, add 310g of ethyl acetate, start stirring, add 23g of TMP, keep it at 50-55°C for 1 hour, add 140g of HDI and 40g of TMP after keeping it warm, add 11g trimethylsilanol, react at 75°C for 2h, add 0.5g trimerization catalyst after the reaction, trimerize at 60°C, check the NCO content every 1h, when the total NCO content drops to 8.5%, cool down and add 0.5 g phosphoric acid polymerization inhibitor to terminate the reaction, cooling and discharging.
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