Method for preparation of antifouling paint from synthetic hydroxyl terminated polyester copolymer

Abstract

The invention relates to a method for preparation of an antifouling paint from a synthetic hydroxyl terminated polyester copolymer. The method mainly takes lactic acid and lactone as the comonomer, adopts polyol as the initiator, employs p-toluenesulfonic acid and stannous octoate as the catalyst, and performs melt polymerization to synthesize the hydroxyl terminated polyester copolymer, can realize self-polishing through self-degradation of resin and current scouring under a flowing seawater environment, and under a motionless seawater environment, by accelerating resin degradation through self-catalysis of degraded lactic acid molecules to resin, resin can still achieve good degradation performance under a motionless seawater environment. The antifouling paint prepared from the hydroxyl terminated polyester copolymer as the matrix adopts isocyanate as the curing agent to conduct curing, the cured antifouling paint has controllable degradation performance and mechanical elasticity, can satisfy a high polishing rate under a low navigation speed or motionless state of ship, also can reduce the antifouling agent dosage, and is green and environment-friendly, thus having good potential application value.

Description

technical field [0001] The invention belongs to the technical field of chemical materials, in particular to a method for preparing an antifouling coating by synthesizing a hydroxyl-terminated polyester copolymer. Background technique [0002] The most economical, effective and common way to solve the problem of fouling organisms is to apply antifouling coatings on the surface of marine facilities. Biodegradable polymers are of great value in antifouling coatings, but there are not many reports on this aspect. [0003] Chinese patent 201110274117.5 discloses a method for synthesizing a resin for biodegradable antifouling coatings. The resin is polymerized from lactic acid oligomers, polyols, and polyisocyanates under catalyst conditions, and provides a biodegradable resin based on the resin. A degradable environmentally friendly antifouling paint composition, but the antifouling paint does not have a longer-term shallow sea hanging board effect, and the degradation rate of th...

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Problems solved by technology

[0003] Chinese patent 201110274117.5 discloses a method for synthesizing a resin for biodegradable antifouling coatings. The resin is polymerized from lactic acid oligomers, polyols, and polyisocyanates under catalyst conditions, and provides a biodegradable resin based on the resin. Degradable environmentally friendly antifouling coating composition, but the antifouling coating does not have a longer-term shallow sea hanging board effect, and the degradation rate of the resin is not disclosed

[0004] Chinese patent 201110452361.6 discloses a comb-type acrylic resin with a side chain grafted polyester resin. The resin has a hydroxyl acrylic resin as the main chain, aliphatic polyester as the side chain, and polyester as a lactone. It is a homogeneous lactide Polymers or copolymers are copolymerized with lactone and lactide as monomers to form polyester. Since there is no small molecule water generated, there are fewer side reactions and the resin is easier to synthesize. However, the price of monomers such as lactide and glycolide is relatively high. High, the cost of synthetic resin is high, not suitable for large-scale application

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