Anti-fouling paint
A paint and antifouling technology, applied in the direction of biocide-containing paints, antifouling/underwater coatings, coatings, etc., can solve the problems of low paint film strength, environmental pollution, introduction, etc.
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Embodiment 1
[0037] Lactic acid polymer A1 was synthesized as follows:
[0038] Into a 1 L separable flask equipped with a thermostat, stirring paddle, nitrogen inlet, Dean-Stark trap, and reflux condenser were charged 22.6 g of trimethylolpropane, 727.4 g of L-lactic acid ( Purac Ltd.), 50 g of toluene and 0.15 g of p-toluenesulfonic acid. In addition, toluene was added to the upper limit of the Dean-Stark trap. Under nitrogen flow, the temperature in the system was raised to 140° C. and maintained for 1 hour. The temperature in the system was further raised to 175°C, and the condensation reaction was continued for 5 hours. After confirming that the acid value of the resin had become not more than 4 mgKOH / g (non-volatile resin), cooling was started. After cooling, butyl acetate was added to adjust the non-volatile content to 80%.
[0039] The obtained lactic acid polymer A1 had an average degree of polymerization of lactic acid of 16 and a hydroxyl value of 46.9 mgKOH / g.
Embodiment 2
[0041] Lactic acid polymer A2 was synthesized as follows:
[0042] Into the same reactor as in Synthesis Example 1, 64.7 g of pentaerythritol, 685.3 g of L-lactic acid (manufactured by Purac Ltd.), 60 g of toluene and 0.15 g of p-toluenesulfonic acid were charged. In addition, toluene was added to the upper limit of the Dean-Stark trap. Under nitrogen flow, the temperature in the system was raised to 140° C. and maintained for 1 hour. The temperature in the system was further raised to 175°C, and the condensation reaction was continued for 5 hours. After confirming that the acid value of the resin had become not more than 4 mgKOH / g (non-volatile resin), cooling was started. After cooling, butyl acetate was added to adjust the non-volatile content to 80%.
[0043] The obtained lactic acid polymer A2 had an average degree of polymerization of lactic acid of 4 and a hydroxyl value of 174.2 mgKOH / g. .
Embodiment 3
[0045] Lactic acid polymer A3 was synthesized as follows:
[0046] Into the same reactor as in Synthesis Example 1, 65.9 g of sorbitol, 684.1 g of L-lactic acid (manufactured by Purac Ltd.), 50 g of toluene and 0.15 g of p-toluenesulfonic acid were charged. In addition, toluene was added to the upper limit of the Dean-Stark trap. Under nitrogen flow, the temperature in the system was raised to 140° C. and maintained for 1 hour. The temperature in the system was further raised to 175°C, and the condensation reaction was continued for 5 hours. After confirming that the acid value of the resin had become not more than 4 mgKOH / g (non-volatile resin), cooling was started. After cooling, butyl acetate was added to adjust the non-volatile content to 80%.
[0047] The obtained lactic acid polymer A3 had an average degree of polymerization of lactic acid of 10 and a hydroxyl value of 198.7 mgKOH / g.
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