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Room temperature curable composite coating based on modified 107 silicone rubber and preparation method thereof

A composite coating and silicone rubber technology, applied in the coating and other directions, can solve the problems of pulverization and damage of the paint film, poor weather resistance and aging resistance of the chain segment, and good flexibility of the molecular chain. The effect of good temperature and weather resistance and low film surface tension

Active Publication Date: 2016-04-13
SHENZHEN JINLIAN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional coating resins are mainly acrylic resins, epoxy resins, and polyurethane resins. The weather resistance and aging resistance of the chain segments are poor. When used outdoors or in high-temperature environments for a long time, molecular chains are prone to breakage and the paint film is pulverized. destroy
The 107 silicone rubber has better heat resistance and weather resistance because the bond energy of Si-O bond is higher than that of C-C bond and C-O bond. However, due to the bond length and bond angle of Si-O-Si bond, the molecular chain Good flexibility, 107 silicone rubber has poor film-forming mechanical properties, poor hardness, high film-forming temperature, and difficult curing
This is also one of the defects that further limits commercial applications

Method used

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  • Room temperature curable composite coating based on modified 107 silicone rubber and preparation method thereof
  • Room temperature curable composite coating based on modified 107 silicone rubber and preparation method thereof
  • Room temperature curable composite coating based on modified 107 silicone rubber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1. Raw materials and mass percentage content are:

[0021]

[0022] 2. Preparation method

[0023] (1) Dissolve and disperse 107 silicone rubber in xylene solvent, stir for 5 minutes to dissolve and disperse evenly, then add 20% of the total content of γ-methacryloxypropyltrimethoxysilane and dibutyltin dilaurate dropwise wt, the reaction system was heated while stirring at a temperature of 50° C., and reacted for 2 hours.

[0024] (2) Stir and disperse azobisisobutyronitrile in the mixed monomer of methyl methacrylate / styrene, and gradually add dropwise to the reaction product of step (1) after stirring evenly. During the dropwise addition, the system was kept stirring and the reaction temperature was controlled at 75°C, and the dropwise time was controlled at 10 minutes. After the dropwise addition was completed, the temperature of the reaction system was controlled at 80°C, heated while stirring, and the reaction time was 8 hours. .

[0025] (3) At room tempera...

Embodiment 2

[0027] 1. Raw materials and mass percentage content are:

[0028]

[0029]

[0030] 2. Preparation method

[0031] (1) Dissolve and disperse 107 silicone rubber in xylene solvent, stir for 10 minutes to dissolve and disperse evenly, then add 20% of the total content of γ-methacryloxypropyltrimethoxysilane and dibutyltin dilaurate dropwise wt, the reaction system was heated while stirring at a temperature of 70° C., and reacted for 4 hours.

[0032] (2) Stir and disperse azobisisobutyronitrile in the mixed monomer of methyl methacrylate / styrene, and gradually add dropwise to the reaction product of step (1) after stirring evenly. During the dropwise addition, the system is kept in a stirring state and the reaction temperature is controlled at 60°C, and the dropwise time is controlled at 60 minutes. After the dropwise addition is completed, the temperature of the reaction system is controlled at 100°C, heated while stirring, and the reaction time is 12 hours. .

[0033]...

Embodiment 3

[0035] 1. Raw materials and mass percentage content are:

[0036]

[0037] 2. Preparation method

[0038] (1) Dissolve and disperse 107 silicone rubber in xylene solvent, stir for 7 minutes to dissolve and disperse evenly, then add 20% of the total content of γ-methacryloxypropyltrimethoxysilane and dibutyltin dilaurate dropwise wt, the reaction system was heated while stirring at a temperature of 60° C., and reacted for 3 hours.

[0039] (2) Stir and disperse azobisisobutyronitrile in the mixed monomer of methyl methacrylate / styrene, and gradually add dropwise to the reaction product of step (1) after stirring evenly. During the dropwise addition, the system was kept stirring and the reaction temperature was controlled at 70°C, and the dropwise time was controlled at 30 minutes. After the dropwise addition was completed, the temperature of the reaction system was controlled at 90°C, heated while stirring, and the reaction time was 9 hours. .

[0040] (3) At room tempera...

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Abstract

The invention discloses a normal temperature-curable composite coating based on modified 107 silicone rubber and a preparation method thereof. The coating comprises the following raw materials by weight: 35-50% of 107 silicone rubber, 15-20% of xylene, 2-10% of gama-methacryloxy propyl trimethoxyl silane, 5-25% of tetraethoxysilane, 5-10% of styrene, 5-10% of methyl methacrylate, 1-5% of fumed silica, 0.4-5% of azobisisobutyronitrile, and 0.05-0.1% of dibutyltin dilaurate. The preparation method comprises the following steps: firstly performing graft polymerization of acrylic resin with chain segments of 107 silicone rubber, then adding fumed silica and tetraethoxysilane into the system, and curing the composite coating to form a film under the action of a catalyst of dibutyltin dilaurate. The composite coating of the invention can be cured to form a film at normal temperature, and is suitable for protection and decoration of different metal substrates.

Description

technical field [0001] The invention belongs to the technical field of coatings, relates to a special high-performance coating, and more specifically relates to a composite coating based on modified 107 silicone rubber that can be cured at room temperature and a preparation method thereof. Background technique [0002] According to a large number of research statistics, 30% of the steel produced every year in the world still suffers from corrosion, and 10% of the steel will become scrap iron. For example, metal corrosion amounts to hundreds of millions of pounds every year in the UK, accounts for about 4.2% of the gross national product in the United States, and accounts for about 4% of the gross national product in my country, exceeding the sum of losses caused by fire, wind and earthquake. With the continuous development of steel, metallurgy, and machinery manufacturing, the issues of rust prevention and consumption reduction have always been the focus of attention and res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D151/08C09D7/12C08F290/06C08F212/08C08F220/14
Inventor 李为立黄东汤继俊
Owner SHENZHEN JINLIAN TECH
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