Branched-structure polyurethane-silicious polyacrylate hot melt adhesive and preparation method thereof
A technology of polyacrylate and branched structure, which is applied in the field of polyurethane-polyacrylate interpenetrating network hot-melt adhesives, which can solve the problems of high melting temperature, low strength, and poor weather resistance of hot-melt adhesives, and achieve low moisture sensitivity , good storage stability and low melting temperature
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Embodiment 1
[0032] 1. Preparation of branched structure polyurethane-silicon-containing polyacrylate resin:
[0033] Add 17.2g of dimethylolbutyric acid and 120g of polycarbonate diol (Mn=3000) into a reactor equipped with a stirring and temperature control device, heat up to 50°C for melting and mixing, add 65g of dicyclohexylmethane diisocyanate, At the same time, 100g of n-butyl acrylate was added, and the temperature was controlled to 88°C for 95 minutes to obtain a polyurethane prepolymer with hydrophilic groups; 4g of trimethylolpropane and 5g of methyl ethyl ketone oxime were added, and the temperature was controlled to 85°C to continue the reaction for 150 minutes to obtain branched Chemical structure end-capped polyurethane prepolymer; add 11g triethylamine, add 500g deionized water to emulsify for 40min under high-speed stirring, then add 0.3g ammonium persulfate initiator, heat up to 80°C and react for 70min; dropwise add 10g vinyl three Ethoxysilane and 35g methyl methacrylate...
Embodiment 2
[0042] 1. Preparation of branched structure polyurethane-silicon-containing polyacrylate resin:
[0043] Add 18.2g of dimethylolbutyric acid and 130g of polytetrahydrofuran diol (Mn=2900) into a reaction kettle equipped with a stirring and temperature control device, heat up to 50°C for melting and mixing, add 70g of dicyclohexylmethane diisocyanate, and simultaneously Add 80g of n-butyl acrylate, control the temperature to 85°C and react for 120min to obtain a polyurethane prepolymer with hydrophilic groups; add 4.5g of trimethylolpropane and 5.6g of methyl ethyl ketone oxime, control the temperature to 85°C and continue to react for 120min to obtain Polyurethane prepolymer end-capped with branched structure; add 12g of triethylamine, add 500g of deionized water to emulsify for 50min under high-speed stirring, then add 0.4g of ammonium persulfate initiator, raise the temperature to 82°C for 70min; add 10g of vinyl Triethoxysilane and 50 g of methyl acrylate continued to react...
Embodiment 3
[0052] 1. Preparation of branched structure polyurethane-silicon-containing polyacrylate resin:
[0053]Add 18g of dimethylolpropionic acid and 130g of polytetrahydrofuran diol (Mn=2900) into a reaction kettle equipped with a stirring and temperature control device, heat up to 45°C for melting and mixing, add 90g of isophorone diisocyanate, and simultaneously add 95g of ethyl acrylate, temperature controlled to 88°C and reacted for 100min to obtain a polyurethane prepolymer with hydrophilic groups; add 7.5g of trimethylolpropane and 4.8g of methyl ethyl ketone oxime, temperature controlled to 75°C and continue to react for 170min to obtain branched Structure-terminated polyurethane prepolymer; add 11g of triethylamine, add 750g of deionized water to emulsify for 55min under high-speed stirring, then add 1.5g of ammonium persulfate initiator, raise the temperature to 77°C for 80min; add dropwise 12g of vinyl trimethoxy base silane and 50g methyl methacrylate, continue to react ...
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Abstract
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