Modified unsaturated polyester resin and preparation method and application thereof
A polyester resin, unsaturated technology, applied in the field of modified unsaturated polyester resin and its preparation, can solve the problems of short storage period, poor mechanical properties, large shrinkage, etc., achieve low VOC emissions, good hardness, durability Excellent effect on acidity and alkalinity
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[0086] A kind of preparation method of unsaturated polyester resin, comprises the steps:
[0087] The unsaturated polybasic acid and the diol are mixed and reacted to obtain a half-esterified product; then the dicyclopentadiene, a polymerization inhibitor, an air-drying agent B and an organic solvent are added to the system to obtain Full esterification products;
[0088] Then add the reactive anionic emulsifier and water to the system in sequence.
[0089] In one of the embodiments, the preparation method of the unsaturated polyester resin comprises the following steps:
[0090] Mix the dihydric alcohol and the unsaturated polybasic acid and react at 160-165°C to obtain a mixture A;
[0091] Raise the temperature to 185-190°C for reaction, when the acid value of the system is 100mgKOH / g-120mgKOH / g, add the dicyclopentadiene to the mixture A and react to obtain the mixture B;
[0092] Add part of the polymerization inhibitor, the air-drying agent B and an organic solvent to...
Embodiment 1
[0130] This example provides a modified unsaturated polyester resin and its preparation method and application
[0131] (1) Modified unsaturated polyester resin is prepared from the raw materials of following parts by weight:
[0132]
[0133] (2) Preparation of modified unsaturated polyester resin 1
[0134] First check that the reaction kettle and the dilution kettle should be clean and free of impurities, and the water separator should be emptied, the bottom of the empty kettle should be opened, and N 2 , the time is 15 minutes, the flow rate is 3m 3 , Kettle: 4m 3 / h; start stirring and put in glycol, propylene glycol, fumaric acid, tetrahydrophthalic anhydride in sequence; quickly heat up to 165°C and control 102°C ≤ distillation temperature ≤ 115°C, keep warm for 1 hour, take 30 minutes to rise to 190°C, and start Measure the acid value, when 100≤AV≤120mgKOH / g, the temperature is lowered to 185°C, and the distillation temperature is controlled to be ≤80°C and open ...
Embodiment 2
[0144] This example provides a modified unsaturated polyester resin and its preparation method and application
[0145](1) Modified unsaturated polyester resin is prepared from the raw materials of following parts by weight:
[0146]
[0147] (2) Preparation of modified unsaturated polyester resin 2
[0148] The preparation method was the same as in Example 1 to obtain the unsaturated polyester tree, 2, and the resin performance results are shown in Table 1.
[0149] (3) Prepare water-based unsaturated primer 2
[0150] Put 90 parts of the above-mentioned modified unsaturated polyester resin 2 into a high-speed mixer, add 0.2 parts of defoamer, 0.2 parts of leveling agent, and 0.3 parts of dispersant at a time under the stirring state of 500r / min, and stir for 5 minutes. Add 4 parts of zinc stearate while stirring, and change to high-speed stirring; after stirring for 15 minutes, filter with a 120-mesh filter, and the obtained filtrate is the main agent 2 of the water-bas...
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