Method for preparing hyperbranched polyester modified organic silicon resin
A technology of polyester modification and silicone, which is applied in the direction of coating, etc., can solve the problems of unsatisfactory heat resistance, acid resistance and salt spray resistance, etc., and achieve excellent salt spray resistance, water and solvent resistance, and high The effect of heat resistance
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[0039] Example 1:
[0040] 1) Hydroxy-terminated hyperbranched polyester
[0041] a) Composition:
[0042] Triol: Trimethylolethane 96g (0.8mol); 1,3,5-benzenetriol 25.2g (0.2mol);
[0043] Dibasic acid: terephthalic acid 132.8g (0.8mol); succinic acid 23.6g (0.2mol);
[0044] b) Synthesis steps:
[0045] Add the triol and dibasic acid to a reactor equipped with heating, condensation and nitrogen protection. Under the protection of nitrogen, the temperature is increased to 110°C for 2h; at a heating rate of 20°C per hour to 240°C, the temperature is kept at 1.33kPa for 4h ; Finally, cool to room temperature to obtain 235 g of hydroxyl-terminated hyperbranched polyester.
[0046] c) Performance of hydroxyl-terminated hyperbranched polyester
[0047] The weight average molecular weight of the hydroxyl-terminated hyperbranched polyester was detected by gel permeation chromatography and the result was 3998.
[0048] The hydroxyl value was tested according to the method described in GB / T7193.2-...
Example Embodiment
[0074] Example 2:
[0075] 1) Hydroxy-terminated hyperbranched polyester
[0076] a) Composition:
[0077] Triols: 168g (1.4mol) of trimethylolethane; 37.8g (0.3mol) of 1,2,4-benzenetriol; 37.8g (0.3mol) of 1,3,5-benzenetriol;
[0078] Dibasic acid: isophthalic acid 66.4g (0.4mol); terephthalic acid 66.4g (0.4mol); adipic acid 29.2g (0.2mol);
[0079] b) Synthesis steps:
[0080] Add the triol and dibasic acid to a reactor equipped with heating, condensation and nitrogen protection. Under the protection of nitrogen, the temperature is raised to 110°C for 2h; at a heating rate of 20°C per hour to 240°C, the temperature is kept at 0.66kPa for 2h ; Finally, cool to room temperature to obtain 364 g of hydroxyl-terminated hyperbranched polyester.
[0081] c) Performance of hydroxyl-terminated hyperbranched polyester
[0082] The weight average molecular weight of the hydroxyl-terminated hyperbranched polyester was detected by gel permeation chromatography and the result was 1990.
[0083] The h...
Example Embodiment
[0104] Example 3:
[0105] 1) Hydroxy-terminated hyperbranched polyester
[0106] a) Composition:
[0107] Triol: 192g (1.6mol) of trimethylolethane;
[0108] Dibasic acid: 157.7g (0.95mol) of isophthalic acid; 7.3g (0.05mol) of adipic acid;
[0109] b) Synthesis steps:
[0110] Put the triol and dibasic acid into a reactor equipped with heating, condensation and nitrogen protection. Under the protection of nitrogen, the temperature is increased to 110℃, and the temperature is kept for 2h; the heating rate is 20℃ per hour to 240℃, and the temperature is 2.5kPa. h; Finally, it is cooled to room temperature to obtain 310 g of hydroxyl-terminated hyperbranched polyester.
[0111] c) Performance of hydroxyl-terminated hyperbranched polyester
[0112] The weight average molecular weight of the hydroxyl-terminated hyperbranched polyester was detected by gel permeation chromatography, and the result was 2611.
[0113] The hydroxyl value was tested according to the method described in GB / T7193.2-1...
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