Free radical quenching-type macromolecule light stabilizer for rubber and plastics
A light stabilizer and free radical technology, applied in the field of plastic additives, can solve the problems of low molecular weight of hindered amines, easy migration, degradation of rubber and plastic aging resistance, etc., to achieve difficult migration, excellent light stability, and increased high temperature resistance Effect
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Embodiment 1
[0023] The preparation steps of the hyperbranched polyester resin A of a kind of terminal amino group are as follows:
[0024] (1) Weigh trimethylolpropane, 2,4 dihydroxybutyric acid, and xylene into the reactor with the ratio of 1:3:0.2, heat to 125°C, and then heat up to 10°C / h 200°C, heat preservation reaction at 200°C under reflux conditions until the acid value is less than 5mg / KOH·g;
[0025] (2) Weigh 2 times the molar amount of the hydroxyl-substituted carboxylic acid in the previous step and add it to the above-mentioned reactor. Under reflux conditions, keep warm at 200°C until the acid value is less than 5 mg / KOH g. During the reaction, remove water through the water separator ;
[0026] (3) repeat (2) step reaction 3 times;
[0027] (4) Add the gamma-amino-n-butyric acid of the amount of substances such as dihydroxyl-substituted carboxylic acid in the previous step to the reactor, and react at 200° C. for 5 hours to obtain the hyperbranched polyester resin soluti...
Embodiment 2
[0029] The preparation steps of the hyperbranched polyester resin B of a kind of terminal amino group are as follows:
[0030] (1) Weigh trimethylolethane, 2,3-dimethylol butyric acid, and toluene with a ratio of 1:3.2:0.5 into the reactor, heat to 135°C, and then hHeat up to 200°C, and keep warm at 200°C under reflux until the acid value is less than 5mg / KOH·g;
[0031] (2) Weigh 2 times the molar amount of the hydroxyl-substituted carboxylic acid in the previous step and add it to the above-mentioned reactor. Under reflux conditions, keep warm at 200°C until the acid value is less than 5 mg / KOH g. During the reaction, remove water through the water separator ;
[0032] (3) repeat (2) step reaction 6 times;
[0033] (4) Add the beta-alanine of the amount of substances such as dihydroxyl substituted carboxylic acid in the previous step to the reactor, and react at 200° C. for 10 h to obtain the hyperbranched polyester resin solution B of the terminal amino group.
Embodiment 3
[0035] The preparation steps of the hyperbranched polyester resin C of a kind of terminal amino group are as follows:
[0036] (1) Weigh trimethylolethane, 2,2-dimethylolpropionic acid and petroleum ether with a ratio of 1:3.1:0.3 into the reactor, heat to 130°C, and then Raise the temperature to 200°C per hour, and keep it warm at 200°C under reflux until the acid value is less than 5mg / KOH·g;
[0037] (2) Weigh 2 times the molar amount of the hydroxyl-substituted carboxylic acid in the previous step and add it to the above-mentioned reactor. Under reflux conditions, keep warm at 200°C until the acid value is less than 5 mg / KOH g. During the reaction, remove water through the water separator ;
[0038] (3) repeat (2) step reaction 4 times;
[0039] (4) Add p-aminobenzoic acid in the amount of substances such as dihydroxyl substituted carboxylic acid in the repeating steps of the previous step to the reactor, and react at 200° C. for 6 hours to obtain a hyperbranched polyest...
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