Biodegradable pressure-sensitive adhesive and preparation method thereof
A technology for pressure-sensitive adhesives and biodegradation, applied in the direction of adhesives, pressure-sensitive films/sheets, grafted polymer adhesives, etc., can solve problems such as poor economy, achieve low cost, simple and easy preparation method, The effect of excellent adhesive performance
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[0031] The invention provides a preparation method of a biodegradable pressure-sensitive adhesive, which includes:
[0032] A) Under the action of a catalyst, react material a with material b to obtain a polyester copolymer containing unsaturated double bonds;
[0033] Material a is selected from aliphatic alkyd and / or aliphatic lactone;
[0034] Material b is selected from unsaturated dicarboxylic acid or unsaturated dibasic acid anhydride;
[0035] B) Under the action of an initiator, the polyester copolymer containing unsaturated double bonds and the vinyl monomer are subjected to free radical polymerization to obtain a biodegradable pressure-sensitive adhesive.
[0036] In the present invention, the catalyst preferably includes one or more of acetate, tin compound, titanium compound and antimony compound. The acetate salt preferably includes one or more of zinc acetate, magnesium acetate, manganese acetate, cobalt acetate and calcium acetate. The tin compound preferably includes o...
Example Embodiment
[0062] Example 1
[0063] Under the protection of nitrogen, 160g (1.65mol) of lactic acid with a mass concentration of 93%, 13g (0.1mol) of itaconic acid and 0.1g of stannous octoate were added to the reactor, and the oil bath was heated to 130°C for 2h, and then heated React at 160°C for 2h, and then heat to 180°C for 2h. The water produced during the reaction is continuously distilled off, and then the temperature is lowered to room temperature to obtain lactic acid oligomers containing unsaturated bonds. Afterwards, under the protection of nitrogen, 5.2g (0.05mol) styrene, 6.4g (0.05mol) butyl acrylate, 0.8g (0.0056mol) glycidyl methacrylate and 0.3g (0.0018mol) AIBN were added to the reactor In the oil bath, the temperature was raised to 65°C for radical polymerization, and the reaction time was 20h. After the reaction, the biodegradable adhesive is obtained.
Example Embodiment
[0064] Example 2
[0065] Under the protection of nitrogen, 160g (1.65mol) of lactic acid with a mass concentration of 93%, 12g (0.1mol) of maleic acid and 0.1g of stannous octoate were added to the reactor, and the oil bath was heated to 130°C for 2h, and then heated Reaction at 180°C for 4h. The water produced during the reaction is continuously distilled off, and then the temperature is lowered to room temperature to obtain lactic acid oligomers containing unsaturated bonds. Afterwards, under the protection of nitrogen, 6g (0.058mol) styrene, 12g (0.065mol) isooctyl acrylate, 0.8g (0.0056mol) glycidyl methacrylate and 0.3g (0.0018mol) AIBN were added to the reactor , The oil bath was heated to 65°C for radical polymerization, and the reaction time was 20h. After the reaction, the biodegradable adhesive is obtained.
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