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Benzoxazine modified organic silicon resin and preparation method and application thereof

A benzoxazine and organosilicon technology, applied in the field of benzoxazine modified organosilicon resin and its preparation, can solve the problems of low mechanical strength, insufficient hydrophobic durability, high cost, and achieve excellent antifouling and durability performance Effect

Inactive Publication Date: 2020-10-30
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the problems of low mechanical strength and insufficient hydrophobic durability of organic silicon resin antifouling materials in the prior art and the high cost of fluorosilicon modification and the sacrifice of environmental protection, the first purpose of the present invention is to provide a low-cost, low-cost Surface energy, green fluorine-free, good durability benzoxazine modified silicone resin

Method used

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  • Benzoxazine modified organic silicon resin and preparation method and application thereof
  • Benzoxazine modified organic silicon resin and preparation method and application thereof
  • Benzoxazine modified organic silicon resin and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The structure of the benzoxazine functional silane is as follows:

[0048]

[0049] 3-methyldimethoxysiloxane-n-propyl-3,4-dihydro-6-methyl-2H-1,3-benzoxazine (that is, the compound of the above structural formula) was passed through the literature (Langmuir. 2011,27 (13): 8365-8370) described method is synthesized, specifically comprises the following steps: logical N in the 250mL four-necked flask with mechanical stirring, condensation tube and thermometer 2 After about 25-30 minutes, add paraformaldehyde (0.1mol) and 50mL of chloroform, then add 7g of ground calcium hydride, and stir gently. Dimethoxysilane (0.05mol), stir vigorously to raise the temperature, add p-cresol (0.05mol) when the system is heated to 85°C, reflux reaction for 3h after the addition is completed, and filter to remove the residue after the reaction is completed, and distill under reduced pressure The solvent and other volatile impurities were removed to obtain the viscous dark yellow liqui...

Embodiment 2

[0065] In the first step, the structure of the benzoxazine-functionalized silane is as follows:

[0066]

[0067] The preparation method of 3-methyldiethoxysiloxane-n-propyl-3,4-dihydro-6-dodecyl-2H-1,3-benzoxazine is the same as in Example 1, p-cresol Substitution to 4-dodecylphenol afforded the desired product (DP-mdeos). 1 HNMR (400MHz, deuterated chloroform, δ): 0.10-0.18,0.58-0.67,0.80-0.90,1.20-1.30,1.58-1.70,2.20-2.35,2.65-2.75,3.50-3.60,3.85-4.00,4.80-4.90 ,6.75-7.15.

[0068] The 4-dodecylphenol, analytically pure, was purchased from Beijing Bailingwei Technology Co., Ltd. The 3-aminopropylmethyldiethoxysilane, with a purity of ≥98%, was purchased from Hubei Debang Chemical New Material Co., Ltd.

[0069] In the second step, the structure of polydimethylsiloxane is as follows:

[0070]

[0071] x is 10.

[0072] Mix 1.0mol DP-mdeos and 0.1mol polydimethylsiloxane and dissolve in chloroform (the amount of chloroform added is 50% of DP-mdeos), add water with ...

Embodiment 3

[0082] In the first step, the benzoxazine functionalized silane has the following structure:

[0083]

[0084] The preparation method of 3-methyldiethoxysiloxane-n-propyl-3,4-dihydro-6-n-butyl-2H-1,3-benzoxazine is the same as in Example 1, replacing p-cresol As 4-n-butylphenol, the target product (BP-mdeos) was obtained. 1 HNMR (400MHz, deuterated chloroform, δ): 0.10-0.18,0.58-0.67,0.80-0.90,1.20-1.30,1.58-1.70,2.20-2.35,2.65-2.75,3.50-3.60,3.85-4.00,4.80-4.90 ,6.75-7.15.

[0085] The 4-n-butylphenol, analytically pure, was purchased from Beijing Bailingwei Technology Co., Ltd. The 3-aminopropylmethyldiethoxysilane, with a purity of ≥98%, was purchased from Hubei Debang Chemical New Material Co., Ltd.

[0086] In the second step, the polydimethylsiloxane structure is as follows:

[0087]

[0088] x is 30.

[0089]7.0mol BP-mdeos and 0.1mol polydimethylsiloxane were mixed and dissolved in ethyl acetate (the amount of ethyl acetate added was 30% of BP-mdeos), and be...

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Abstract

The invention discloses benzoxazine modified organic silicon resin. The benzoxazine modified organic silicon resin is prepared by polycondensation of benzoxazine functionalized silane and polydimethylsiloxane, the benzoxazine modified organic silicon resin has a structural formula shown in the specification, each substituent is defined in detail in the specification. The invention provides a novelbenzoxazine modified organic silicon resin which is low in cost, low in surface energy, green, fluoride-free and good in durability. Compared with traditional fluorine-silicon modification, the benzoxazine modified organic silicon resin has lower surface free energy than fluorine-containing compounds, does not contain any fluorine atoms, is low in cost and environment-friendly, has better mechanical strength, and can make up for the defect of poor mechanical properties of organic silicon.

Description

technical field [0001] The invention belongs to the technical field of silicone resins, and in particular relates to a benzoxazine-modified silicone resin and its preparation method and application. Background technique [0002] Aquatic plant and animal microorganisms such as barnacles, oysters, sea squirts, sea cabbage, and green cortex attached to the surface of marine facilities will cause serious biofouling problems to marine facilities, which not only reduces the performance of the equipment, but also significantly reduces the quality of the facilities. and the safe and efficient operation of materials. Taking ships as an example, biofouling will greatly increase the dynamic resistance of the ship's hull. A biofilm with a thickness of 100 μm will increase the frictional resistance by more than 10%, and a thickness of 1mm can increase the resistance by 80% and reduce the speed of the ship by 15%. When the biofouling on the bottom of the ship is serious, the adhesion of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/388C09D183/08C09D5/16
CPCC08G77/388C09D5/1662C09D183/08
Inventor 辛忠周长路
Owner EAST CHINA UNIV OF SCI & TECH
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