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A kind of underwater self-healing organosilicon antifouling coating and preparation method thereof

An antifouling coating and silicone technology, applied in antifouling/underwater coatings, coatings, paints containing biocide, etc., can solve the problems of low substrate adhesion and poor mechanical properties, and achieve improved adhesion, Strong practicability, simple and efficient preparation process

Active Publication Date: 2022-03-29
INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the shortcomings of poor mechanical properties and low adhesion to the substrate of the current silicone low surface energy antifouling coatings, the present invention provides an underwater self-healing silicone antifouling coating based on dynamic disulfide bonds, multiple hydrogen bonds and metal coordination bonds. Dirty coating and method for preparing same

Method used

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  • A kind of underwater self-healing organosilicon antifouling coating and preparation method thereof
  • A kind of underwater self-healing organosilicon antifouling coating and preparation method thereof
  • A kind of underwater self-healing organosilicon antifouling coating and preparation method thereof

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preparation example Construction

[0043] A preparation method of underwater self-repairing organic silicon antifouling coating is carried out according to the following steps:

[0044] Step 1: first dissolve a certain amount of dopamine hydrochloride in a large amount of absolute ethanol (making the concentration of dopamine hydrochloride 0.05mol / L) under a nitrogen atmosphere, then add a certain amount of triethylamine to neutralize the hydrochloric acid at room temperature Hydrochloride in dopamine. Add a certain amount of condensing agent 2-ethoxy-1-ethoxycarbonyl-1,2-dihydroquinoline and α-lipoic acid or / and its derivatives to condense with dopamine at room temperature for 24 hours after reacting for 1 hour , so as to obtain catechol functionalized lipoic acid derivatives;

[0045] Step 2: reacting excess amino-terminated polysiloxane with diisocyanate in a mixed solution of isopropanol and tetrahydrofuran for 3 hours to generate amino-terminated polysiloxane containing urea bonds. Then add a certain amo...

Embodiment 1

[0048] (1) Add 1.5 g of triethylamine dropwise to a three-necked flask containing 2.8 g of dopamine hydrochloride and 300 mL of absolute ethanol under a nitrogen atmosphere, and react at room temperature for 1 h. Then add 3.1g of α-lipoic acid and 3.7g of 2-ethoxy-1-ethoxycarbonyl-1,2-dihydroquinoline, and react at room temperature for 24h, and finally obtain phthalate as a yellow oily liquid Phenol-functionalized lipoic acid.

[0049] (2) Dissolve 3g of 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane in a mixed solvent of 13.5g of isopropanol and 13.5g of tetrahydrofuran under constant pressure The dropping funnel was added dropwise to a three-necked flask containing 2.2 g of isophorone diisocyanate dissolved in a mixed solvent of 10 g of isopropanol and 10 g of tetrahydrofuran. After the addition was completed, it was reacted at room temperature for 3 hours, and then 4.9 g of α-lipoic acid was added. React at 45°C for 6 hours to obtain diisocyanate-modified siloxane li...

Embodiment 2～11 and comparative example 1

[0053] Except for changing the types and amounts of monomers / prepolymers, crosslinking agents, metal salts and antifouling agents, the rest of the steps and conditions were the same as in Example 1 to obtain different antifouling coatings, see Table 1 for details. The amino double head in the table refers to 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane, and the amino-terminated silicone oil (3000Mw, 10000Mw and 20000Mw) refers to different Molecular weight amoterminated polysiloxane.

[0054] Table 1

[0055]

[0056] In order to evaluate the static antifouling effect of the present invention, the method of actual sea hanging board test has been adopted, with reference to GB / T5370-2007 (antifouling paint model shallow sea immersion test method) the antifouling coating system prepared in the embodiment is immersed Qingdao coastal water, investigated its antifouling performance (see image 3 ), scored according to the adhesion area of ​​fouling organisms on the surf...

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Abstract

The invention belongs to the field of marine antifouling, in particular to an underwater self-repairing organic silicon antifouling coating based on dynamic disulfide bonds, multiple hydrogen bonds and metal coordination bonds and a preparation method thereof. The silicone antifouling coating is obtained by reacting catechol-functionalized lipoic acid derivatives and diisocyanate-modified polysiloxane lipoic acid derivatives containing urea bonds and amide bonds, crosslinking agents, metal salts and antifouling agents . The antifouling coating of the present invention simultaneously contains a dynamic physical crosslinking network of dynamic disulfide bonds, multiple hydrogen bonds, and metal coordination bonds, and has excellent air and underwater self-repairing properties. Furthermore, the introduced catechol moiety significantly improved the adhesion of the coating. The antifouling coating has no pollution to the environment and ecology, is green and environmentally friendly, and has broad application prospects in the field of marine antifouling.

Description

technical field [0001] The invention belongs to the field of marine antifouling, in particular to an underwater self-repairing organic silicon antifouling coating based on dynamic disulfide bonds, multiple hydrogen bonds and metal coordination bonds and a preparation method thereof. Background technique [0002] The ocean is the harshest and most complex environment, and biofouling is particularly serious. The attachment of marine fouling organisms to the surface of marine facilities will cause a series of problems such as harm to the operation of equipment. Therefore, biofouling protection and control technologies, especially green and environmentally friendly new antifouling materials, have more and more important application research needs. [0003] At present, common antifouling measures for biofouling of marine facilities mainly include regular physical removal method, biological cycle avoidance method, electrolytic antifouling method, direct poisoning method (chemical ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D4/06C09D5/16C08G77/392
CPCC09D4/06C09D5/1675C09D5/1625C09D5/1656C08G77/392
Inventor 段继周孙佳文刘超侯保荣
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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