A kind of preparation method of air-drying unsaturated polyester resin
A polyester resin and unsaturated technology, which is applied in the field of preparation of unsaturated polyester resin, can solve the problems that the surface of the product cannot be completely dried and the surface of the product is sticky, etc., and achieve improved transparency and toughness, good mechanical properties, and improved use. operational effect
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[0024] A preparation method of air-drying unsaturated polyester resin, including the following steps:
[0025] 1) Prepare polyhydric alcohol, polybasic acid and catalyst. The molar ratio of polyhydric alcohol and polybasic acid is 2-4:1, in which polybasic acid is saturated polybasic acid; saturated polybasic acid is phthalic anhydride, isophthalic acid, and p-benzene One or more mixtures of dicarboxylic acid, adipic acid, tetrahydrophthalic anhydride, and intramethylenetetrahydrophthalic anhydride;
[0026] 2) Add the polyol, polyacid and catalyst prepared in step 1) to the reactor for esterification reaction, control the reaction temperature at 165-220℃, and react for 1-5 hours until the acid value of the reactant is less than 15mgKOH / g and stop the reaction , When the product is cooled to 150-160°C, proceed to the next step of reaction operation; the catalyst is one or more mixtures of monobutyltin oxide, dibutyltin oxide, stannous octoate or lanthanum methanesulfonate, The amo...
Embodiment 1
[0030] Put 103g of dipropylene glycol, 192.5g of neopentyl glycol, 123g of polyethylene glycol-200 and 115g of tetrahydrophthalic anhydride into the reactor, add 0.5g of stannous octoate, heat up the reactor after it is sealed, and wait for the reaction After the material is gradually melted, turn on the stirring device and turn it, and control the stirring rate at 160~200rpm. During the heating process, the temperature of the distillation head of the fractionation column is controlled to not exceed 100°C, the reactants are gradually heated to 205°C to 220°C, and the reaction is kept in this temperature range for 5 hours, and the acid value is 8mgKOH / g. Stop heating.
[0031] When the above reactants are cooled to 150°C to 160°C, 266 g of fumaric acid and 0.3 g of hydroquinone are added to the reactor. The reactor is sealed, the stirring device is turned on, the stirring speed is 160~200rpm, and the reactor is heated at the same time. During the heating process, control the dis...
Embodiment 2
[0035] Put 87g of dipropylene glycol, 202g of neopentyl glycol, 65g of polyethylene glycol-200 and 157g of tetrahydrophthalic anhydride into the reactor, add 0.7g of stannous octoate, heat up the reactor after it is closed, and wait for the reactants After gradually melting, turn on the stirring device and turn it, and control the stirring speed at 160~200rpm. During the heating process, control the distillation head temperature of the fractionation column to not exceed 100°C, gradually increase the temperature of the reactants to 205°C~220°C, and keep the reaction in this temperature range for 4h, and the measured acid value is 11mgKOH / g. Stop heating.
[0036] When the above-mentioned reactant is cooled to 150°C to 160°C, 255 g of fumaric acid, 34 g of diethylene glycol and 0.3 g of hydroquinone are added to the reactor. The reactor is sealed, the stirring device is turned on, the stirring speed is 160~200rpm, and the reactor is heated at the same time. During the heating pro...
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