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Hyperbranched silane modified polyurethane composite polysiloxane antifouling paint and preparation method thereof

A technology of hyperbranched silane and polysiloxane, used in polyurea/polyurethane coatings, antifouling/underwater coatings, anti-corrosion coatings, etc. effect and other problems, to achieve the effect of overcoming poor adhesion, high adhesion and excellent bonding strength

Active Publication Date: 2020-05-12
QUZHOU RES INST OF ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low adhesion between the low surface energy antifouling coating and its contact interface, the low surface energy antifouling coating and its coated substrate often cannot achieve good coating and application effects.
In order to solve the shortcomings of poor adhesion between low surface energy antifouling coatings and substrates, it is necessary to optimize the formulation of polysiloxane low surface energy antifouling coatings and introduce a hyperbranched silane-modified polyurethane to enhance low surface energy antifouling coatings. The bonding strength between the fouling coating and the substrate makes the epoxy primer and the low surface energy antifouling paint form a good supporting system to achieve long-term and stable antifouling effect

Method used

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  • Hyperbranched silane modified polyurethane composite polysiloxane antifouling paint and preparation method thereof
  • Hyperbranched silane modified polyurethane composite polysiloxane antifouling paint and preparation method thereof
  • Hyperbranched silane modified polyurethane composite polysiloxane antifouling paint and preparation method thereof

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preparation example Construction

[0058] 1. Preparation of hyperbranched silane modified polyurethane

[0059] Use hydroxyl-terminated polysiloxane with a weight-average molecular weight of 500 or 1000 and polytetrahydrofuran ether diol with a weight-average molecular weight of 500 or 1000 as the polyurethane soft segment, and take hydroxyl-terminated polysiloxane at a molar ratio of 2:1 to 1:2. Alkanes and polytetrahydrofuran ether glycol, mixed uniformly; then blended with polyurethane hard segment, polyurethane hard segment is one or both of isophorone diisocyanate or diphenylmethane diisocyanate, control the group NCO of isocyanate The molar ratio of the hydroxyl group OH in the hydroxyl-containing polyurethane soft segment is 1.8-2.5:1; then add an organic tin or organic bismuth catalyst, the weight of the catalyst is 0.2% of the total weight of the polyurethane soft segment and polyurethane hard segment, at 85 ℃ for 5 hours; add trimethylolpropane chain extender, and control the amount of chain extender ...

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Abstract

The invention relates to a marine antifouling coating technology, and aims to provide a hyperbranched silane modified polyurethane composite polysiloxane antifouling coating and a preparation method thereof. The coating is a three-liquid type product, wherein the main paint is formed by mixing organopolysiloxane containing at least two condensation reactive groups, filler and a xylene solvent; thecross-linking curing agent is formed by mixing hyperbranched silane modified polyurethane, organosilane (which can be subjected to condensation reaction with condensation reactive groups of main paint resin), partial hydrolysate of the organosilane, and a xylene solvent; wherein the curing accelerator is formed by mixing a silane coupling agent, an organic tin catalyst and a xylene solvent. According to the present invention, the adhesion of the polysiloxane low surface energy antifouling finishing coat coating to the epoxy primer can be enhanced, and the low surface energy antifouling finishing coat has advantages of excellent fresh water resistance, salt and alkali corrosion resistance, long-term stable existence at the room temperature, environmental protection requirement meeting, andlow application cost; good rheological performance and film forming performance are achieved, and then good construction performance is achieved; the synthesis method is relatively simple and convenient for industrial production.

Description

technical field [0001] The invention relates to a marine antifouling coating technology, in particular to a hyperbranched silane-modified polyurethane composite polysiloxane antifouling coating directly used on the surface of an epoxy resin anticorrosion coating film and a preparation method thereof. No link coat or tie coat is used in the foul release coating. The combined coating system comprises a curable or crosslinkable polysiloxane low surface energy antifouling topcoat and a silane-terminated polyurethane, and relates to the described method for reinforcing polysiloxane low surface energy coatings with epoxy A method for preparing hyperbranched silane-modified polyurethane with anticorrosion primer adhesive properties, and the hyperbranched silane-modified polyurethane composite polysiloxane antifouling coating and a preparation method thereof. Background technique [0002] my country's land coastline is more than 18,000 kilometers long, and the ocean environment is ...

Claims

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Application Information

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IPC IPC(8): C09D183/04C09D175/04C09D5/16C09D5/08C09D7/61C08G18/66C08G18/61C08G18/48C08G18/32
CPCC08G18/3206C08G18/4854C08G18/61C08G18/6677C08K2003/2241C09D5/08C09D5/1637C09D5/1675C09D183/04C08L75/08C08K3/36C08K3/22C08K5/54
Inventor 张庆华郭鸿宇詹晓力陈丰秋程党国
Owner QUZHOU RES INST OF ZHEJIANG UNIV
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