Solvent-free ultraviolet light dual-curing hot melting pressure-sensitive adhesive
A hot-melt pressure-sensitive adhesive, dual-curing technology, used in pressure-sensitive films/sheets, monocarboxylate copolymer adhesives, adhesives, etc. Coating practicality and other issues
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Embodiment 1
[0028] Preparation of free-radically UV-curable (meth)acrylate copolymers:
[0029] Weigh 350 g of ethyl acetate, 200 g of propylene isooctyl, 150 g of methyl acrylate, 0.5 g of VAZO 64, and 3 g of 4-methacryloxybenzophenone into a 2-liter four-neck glass flask . The glass reaction flask was equipped with a stirrer, water-cooled condenser and nitrogen inlet and a temperature probe mounted in the flask. Heat slowly until the caprolactone temperature in the flask reaches 80°C. The temperature was maintained at 80 °C under continuous stirring and nitrogen protection. A monomer containing 350 g of ethyl acetate, 200 g of propylene isooctyl, 150 g of methyl acrylate, 0.9 g of VAZO64, and 3 g of 4-methacryloxybenzophenone was then slowly dropped over 2 hours. mixture. The temperature in the flask was kept constant at 80°C during the dropwise addition. After the monomer addition was completed, the polymerization reaction was continued at 80° C. for 8 hours. Then the temperature...
Embodiment 2
[0031] Preparation of cationic UV-curable (meth)acrylate copolymers:
[0032]Weigh 350 g of ethyl acetate, 200 g of propylene isooctyl, 150 g of methyl acrylate, 0.5 g of VAZO 64, and 3 g of Cyclomer M100, and add them into a 2-liter four-neck glass flask. The glass reaction flask was equipped with a stirrer, water-cooled condenser and nitrogen inlet and a temperature probe mounted in the flask. Heat slowly until the caprolactone temperature in the flask reaches 80°C. The temperature was maintained at 80 °C under continuous stirring and nitrogen protection. A monomer mixture containing 350 g of ethyl acetate, 200 g of propylene isooctyl, 150 g of methyl acrylate, 0.9 g of VAZO64, and 3 g of Cyclomer M100 was then slowly dropped over 2 hours. The temperature in the flask was kept constant at 80°C during the dropwise addition. After the monomer addition was completed, the polymerization reaction was continued at 80° C. for 8 hours. Then add 1.5 grams of cationic photoinitiat...
Embodiment 3
[0034] Preparation of solvent-free UV dual-cure hot-melt pressure-sensitive adhesive:
[0035] 200 grams of radical UV-curable (meth)acrylate copolymer and 200 grams of cationic UV-curable (meth)acrylate copolymer were added to a 1 liter four-neck glass flask. The glass reaction flask was equipped with a stirrer, water-cooled condenser, nitrogen inlet, and a temperature probe mounted in the flask. After stirring for 1 hour at 130 degrees under the protection of nitrogen, a solvent-free hot-melt pressure-sensitive adhesive that can be dual-cured by ultraviolet light is prepared. The hot-melt pressure-sensitive adhesive product contains no more than 0.5% volatile matter, and the viscosity of the hot-melt adhesive at 130 degrees is 45,000 cps.
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