Hydroxyl terminated polyester resin for powder paint, preparation method and prepared powder paint
A hydroxyl-terminated polyester and powder coating technology, applied in the polymer field, can solve the problems of poor mechanical properties, poor dispersion of titanium dioxide, and high dosage, and achieve the effects of reducing the amount of addition, superior mechanical properties, and reducing costs.
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[0029] The titanium dioxide is rutile titanium dioxide or anatase titanium dioxide. The method for preparing the hydroxyl-terminated polyester resin for powder coating as described above includes the following steps:
[0030] (1) Add the proportioned amount of the polyol and branching agent into the reactor, heat to increase the temperature, and then add the proportioned amount of the aromatic polybasic acid, fatty polybasic acid, inorganic pigment and catalyst in sequence, and continue to heat up with nitrogen. At 250°C, react for a total of 5-12 hours until 95% of the esterified water is discharged, and the acid value reaches 8-20mgKOH / g;
[0031] (2) Add the acid hydrolyzing agent in the proportion of polyester to the reaction kettle, react for 1-7 hours, until the acid value reaches 27-70mgKOH / g, vacuum polycondensation, the polycondensation time is 0.5-2 hours to make the viscosity After reaching 2500-6500 mPa·s, the end-capping reaction is performed for 0.5-3 hours to obtain...
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[0032] Example 1
[0033] The hydroxyl-terminated polyester resin includes the following components, each component in weight percentage: neopentyl glycol 10%, isophthalic acid 60%, adipic acid 1%, trimethylolpropane 1.5%, 1.4- Cyclohexane dicarboxylic acid 27.2%, monobutyl tin oxide 0.1%, titanium dioxide 0.2%.
[0034] The hydroxyl-terminated polyester resin prepared in accordance with the above steps and components is used to prepare powder coatings. The powder coatings are white and suitable for indoor use. The composition of the powder coatings includes: the acid value of about 70mgKOH / g 30kg of hydroxyl terminated polyester resin; 30kg of epoxy resin with 0.12mol / 100g of epoxy resin; 1kg of leveling agent, 1kg of brightener, 0.5kg of benzoin; 20kg of barium sulfate, the barium sulfate is preferably precipitated barium or ultrafine barium ; Titanium dioxide 12.5kg, the titanium dioxide is preferably rutile titanium dioxide; Ultramarine blue 0.08kg.
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[0035] Example 2
[0036] The hydroxyl-terminated polyester resin includes the following components, each component in weight percentage: neopentyl glycol 22%, isophthalic acid 50%, adipic acid 4%, trimethylolpropane 1%, 1.4- Cyclohexane dicarboxylic acid 22.5%, monobutyl tin oxide 0.1%, titanium dioxide 0.4%.
[0037] The hydroxyl-terminated polyester resin prepared according to the above steps is used to prepare powder coatings, the powder coating is white, suitable for outdoor use, and its composition includes: 30 kg of the hydroxyl-terminated polyester resin with an acid value of about 32 mgKOH / g; TGIC curing agent 4.2kg; leveling agent 1kg, brightener 1kg, benzoin 0.5kg; barium sulfate 20kg, the barium sulfate is preferably precipitated barium or ultrafine barium; titanium dioxide 12.5kg, the titanium dioxide is preferably rutile titanium White powder; ultramarine 0.08kg.
[0038] The formulas of the hydroxyl-terminated polyester resin and commonly used polyester resin prepare...
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