Polychloroethylene plastisol and preparation method thereof
A polyvinyl chloride and plastisol technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of long plasticizing time, high plasticizing temperature, easy yellowing after curing, etc., and achieve the effect of improving easy yellowing
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Embodiment 1
[0017] 1-1. On a 250mL four-necked flask, equipped with stirring, thermometer, and condenser. Put in 30g of polyester diol and 2g of trimethylolpropane, dehydrate for 1h at a vacuum of 0.002Mpa and a temperature of 110±5°C, cool to 60°C, add 16.6g of IPDI and 0.04g of dibutyltin dilaurate ; The temperature was raised to 80° C., and the reaction time was 4 hours to obtain an isocyanate-terminated prepolymer; then 12 g of diethyl malonate was added, and the reaction was continued at 80° C. for 4 hours to obtain a blocked polyurethane.
[0018] 1-2. Mix 6 g of the end-blocked polyurethane prepared above, 290 g of dioctyl phthalate, and 5 g of dimer acid type low-molecular-weight polyamide evenly. Then add 300g of dry bentonite and 1.5g of Ca / Zn stabilizer, finally add 120g of hard calcium carbonate and 100g of polyvinyl chloride paste resin, disperse evenly in a high-speed disperser, and degas under vacuum to obtain plastisol.
[0019] The viscosity of the polyvinyl chloride pl...
example example 2
[0021] 2-1. On a 250mL four-neck flask, equipped with stirring, thermometer and condenser. Put in 30g of polyester diol and 4g of trimethylolpropane, dehydrate for 1h at a vacuum of 0.002Mpa and a temperature of 110±5°C, cool to 60°C, add 20.1g of HDI and 0.04g of dibutyltin dilaurate ; The temperature was raised to 80° C., and the reaction time was 5 hours to obtain an isocyanate-terminated prepolymer; then 19.1 g of diethyl malonate was added, and the reaction was continued at 80° C. for 4 hours to obtain a blocked polyurethane.
[0022] 2-2. Mix 8 g of the above-prepared end-blocked polyurethane, 270 g of dioctyl phthalate, and 5 g of dimer acid type low-molecular-weight polyamide evenly. Then add 400g of dry bentonite and 1.5g of Ca / Zn stabilizer, and finally add 100g of polyvinyl chloride paste resin to disperse evenly in a high-speed disperser, and degas under vacuum to obtain a plastisol.
[0023] The polyvinyl chloride plastisol prepared above has little change in vis...
Embodiment 3
[0025] 3-1. On a 250mL four-neck flask, equipped with stirring, thermometer, and condenser. Put in 30g of polyester diol and 3g of glycerin, dehydrate for 1h at a vacuum of 0.002Mpa and a temperature of 110±5°C, cool to 60°C, add 23.3g of HDI biuret (-NCO content is 23%) and 0.04 g of dibutyltin dilaurate; the temperature was raised to 80°C, and the reaction time was 4h to obtain an isocyanate-terminated prepolymer; then 12.9g of diisopropylamine was added, and the reaction was continued at 80°C for 4h to obtain a blocked polyurethane.
[0026] 3-2. Mix 6 g of the above-prepared end-blocked polyurethane, 260 g of dioctyl phthalate, and 6 g of dimer acid type low-molecular-weight polyamide evenly. Then add 300g of dry bentonite and 1.5g of Ba / Zn stabilizer, finally add 140g of active calcium carbonate and 100g of polyvinyl chloride paste resin, disperse evenly in a high-speed disperser, and defoam under vacuum to obtain a plastic Sol.
[0027] The polyvinyl chloride plastisol...
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