A kind of self-polishing type low surface energy polyurethane and its preparation method and application

A low surface energy, polyurethane technology, applied in polyurea/polyurethane coatings, biocide-containing paints, coatings, etc., can solve the problems of slow self-polishing speed, dirt adhesion, growth speed, dirt adhesion, etc., to achieve suitable for large-scale Production, good anti-fouling, effect in mild conditions

Active Publication Date: 2020-10-09
HAINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, due to the self-polishing speed of the polyurethane materials disclosed in the prior art is slower than the adhesion and growth speed of dirt, dirt will still adhere to the surface of objects only relying on the degradation performance of the coating.

Method used

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  • A kind of self-polishing type low surface energy polyurethane and its preparation method and application
  • A kind of self-polishing type low surface energy polyurethane and its preparation method and application
  • A kind of self-polishing type low surface energy polyurethane and its preparation method and application

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preparation example Construction

[0055] The present invention also provides a method for preparing the self-polishing low surface energy polyurethane described in the above technical solution, comprising the following steps:

[0056] a) mixing the cyclic monomer, the polyol and the catalyst, and performing the first reaction to obtain the first reaction product;

[0057] b) mixing fluorine-containing vinyl monomers, solvents, catalysts and polyols, and performing a second reaction to obtain a second reaction product;

[0058] c) mixing the first reaction product obtained in step a), the second reaction product obtained in step b) and the catalyst, and performing a third reaction to obtain a third reaction product;

[0059] d) washing and dewatering the third reaction product obtained in step c) successively, then mixing with diisocyanate, and performing the fourth reaction to obtain self-polishing low surface energy polyurethane;

[0060] The steps a) and b) are not limited in sequence.

[0061] In the pres...

Embodiment 1

[0092] (1) Add 2 g of lactide, 0.86 mL of dehydrated ethylene glycol and 0.025 mL of stannous octoate into a three-necked flask with a stirrer and a thermometer, and react at 145° C. for 3 h under nitrogen protection to obtain the first reaction product.

[0093] (2) Add 5.55g of dodecafluoroheptyl methacrylate to another three-necked flask with a stirrer, add 20mL of tetrahydrofuran, then add 5.55g of m-chloroperoxybenzoic acid, stir and react at room temperature for 8h, and then Add 0.86 mL of dehydrated ethylene glycol and 0.036 g of boron trifluoride ether solution, stir and react at room temperature for 24 hours to obtain the second reaction product.

[0094] (3) Add the first reaction product obtained in step (1), 0.0064 g of concentrated sulfuric acid, to the second reaction product obtained in step (2), and react at 140° C. for 20 min to obtain a third reaction product.

[0095] (4) Wash the third reaction product obtained in step (3) with water, dry it in vacuum to re...

Embodiment 2

[0099] (1) Add 2.5g of lactide, 1.08mL of dehydrated polyethylene glycol and 0.03mL of stannous octoate into a three-necked flask with a stirrer and a thermometer, and react at 120°C for 4 hours under nitrogen protection to obtain the first reaction product.

[0100] (2) Add 6.94g of dodecafluoroheptyl methacrylate to another three-necked flask with a stirrer, add 20mL of xylene, then add 6.94g of m-chloroperoxybenzoic acid, and stir the reaction at room temperature for 8h, Then, 1.08 mL of dehydrated polyethylene glycol and 0.045 g of boron trifluoride ether solution were added, and the mixture was stirred and reacted at room temperature for 12 hours to obtain the second reaction product.

[0101] (3) Add the first reaction product obtained in step (1), 0.008 g of concentrated sulfuric acid, to the second reaction product obtained in step (2), and react at 120° C. for 10 min to obtain a third reaction product.

[0102] (4) Wash the third reaction product obtained in step (3)...

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Abstract

The invention provides self-polishing low surface energy polyurethane which comprises the following raw materials: 5-10wt% of cyclic monomer, 5-10wt% of polyhydric alcohol, 20-26wt% of fluorovinyl monomer, 20-26wt% of diisocyanate, 20-28wt% of catalyst and the balance of solvent. Compared with the prior art, self-polishing low surface energy polyurethane is prepared from the raw materials of specific contents; a main chain of polyurethane contains a polyester chain segment; and a side chain contains fluorine; polyurethane has good antifouling and self-cleaning performance; at the same time, the side chain contains fluorine, so that marine organism absorption can be inhibited; the polyester chain segment of the main chain can be broken by the action of seawater; an antifouling agent can beeffectively regulated to be released at a constant rate; retention of active substances on the surface of a ship coating is ensured; an antifouling requirement of low speed ships, underwater ships andoffshore production platform facilities are met; and therefore, polyurethane can be applied to ocean fouling prevention and has wide development prospects in the field of environment-friendly ocean antifouling paint.

Description

technical field [0001] The invention relates to the technical field of antifouling materials, and more specifically relates to a self-polishing low surface energy polyurethane and its preparation method and application. Background technique [0002] Marine biofouling refers to the adhesion and growth of marine organisms on artificial surfaces such as hulls, aquaculture cages, and pipelines, causing huge harm to marine transportation and the exploration, development, and utilization of marine resources. For example, marine biofouling will increase the surface roughness and navigation resistance of the ship's hull, thereby increasing fuel consumption and carbon dioxide emissions, and aggravating the global warming effect; marine biofouling changes the surface state of the ship's hull and other marine facilities, thereby accelerating its Corrosion speed; marine biofouling reduces the speed of ships and weakens the combat effectiveness of the navy; marine biofouling also blocks ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/34C08G18/73C08G18/76C09D175/06C09D5/16
CPCC08G18/348C08G18/73C08G18/7671C09D5/1637C09D5/1662C09D175/06
Inventor 汪国庆徐悦孔维悦王爱民
Owner HAINAN UNIVERSITY
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