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Organic-inorganic hybrid paint and its preparing method

A paint and inorganic technology, applied in the field of organic-inorganic hybrid paint and its preparation, can solve the problems of complex reaction conditions, high cost, difficult control, etc., and achieve the effect of simple reaction device, mild reaction conditions and high purity

Inactive Publication Date: 2006-05-31
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above-mentioned organic-inorganic hybrid coating and its preparation method have the following disadvantages: 1. The boiling point of the reactant dimethylchlorosilane is 34.7°C, and the boiling point of methyldichlorosilane is 40.4°C, while the reaction conditions in this scheme It is 50-60°C, which will inevitably require condensation or sealing devices to prevent the volatilization of chlorosilanes. The requirements for technical equipment are complicated, and the conversion rate of reactants will inevitably be affected.
2. The hydrolysis of Si-Cl will produce HCl, and the silanol of the structure shown in the figure is difficult to store, and it is easy to condense under acidic conditions, and the obtained product is actually an oligomer, so it is useful for the control of the preparation of a reaction product with a clear structure It must be difficult; in order to neutralize the acid produced in the system, alkali needs to be used, which will inevitably introduce impurities. If not treated, this will affect the aging resistance of the final paint film; a large amount of ether solvent is needed to buffer the acidity of the solution, and the cost is high , and not safe
4. The two-step reaction conditions are relatively complex and harsh, and the requirements for the reaction device are relatively high

Method used

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  • Organic-inorganic hybrid paint and its preparing method
  • Organic-inorganic hybrid paint and its preparing method
  • Organic-inorganic hybrid paint and its preparing method

Examples

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Effect test

example 1

[0017] Example 1: Put D 4 H Mix with VTMO at a molar ratio of 1:4, add chloroplatinic acid catalyst dropwise under conditions of ice-water bath, nitrogen protection and stirring, react at 40°C for 2h, and react at 60°C for 12h to obtain a light yellow, transparent oily synthetic precursor, denoted as D 4 H -VTMO (1:4); its chemical reaction formula is as follows:

[0018]

example 2

[0019] Example 2: Put D 4 H Mix it with VTMO at a molar ratio of 1:3, add chloroplatinic acid catalyst dropwise under conditions of ice-water bath, nitrogen protection and stirring, react at 40°C for 2h, and react at 60°C for 12h to obtain a light yellow, transparent oily synthetic precursor, denoted as D 4 H -VTMO (1:3); its chemical reaction formula is as follows:

[0020]

example 3

[0021] Example 3: Put D 4 H Mix with VTMO at a molar ratio of 1:2, add chloroplatinic acid catalyst dropwise under conditions of ice-water bath, nitrogen protection and stirring, react at 40°C for 2h, and react at 60°C for 12h to obtain a light yellow, transparent oily synthetic precursor, denoted as D 4 H -VTMO (1:2); its chemical reaction formula is as follows:

[0022]

[0023] 2, the preparation method of organic-inorganic hybrid paint sol of the present invention

[0024] Using isopropanol as a solvent, the precursor product D with different proportions prepared above 4 H -VTMO was mixed with TEOS at a molar ratio of 1:q, q=1-4, the pH of the system was adjusted to 4.0 with 0.1 mol / L p-toluenesulfonic acid solution, and the coating sol was prepared by stirring at room temperature for 2 hours.

[0025] 3. The preparation method of the organic-inorganic hybrid paint film of the present invention

[0026] According to GB / T 1727-92 "General preparation method of pain...

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Abstract

The invention discloses an organic-inorganic hybrid coating and a preparation method thereof. The raw material is 2,4,6,8-tetramethylcyclotetrasiloxane (D 4 H ), vinylalkoxysilane (VTMO), orthoethyl silicate (TEOS), isopropanol, 0.1mol / L p-toluenesulfonic acid solution and chloroplatinic acid solution as a catalyst. The preparation of the coating precursor only needs one-step addition reaction, no alcoholysis or hydrolysis is required, the boiling point of the reactants is above 100°C, and the maximum reaction temperature is around 60°C, the reaction conditions are mild, the reaction device is simple, the cost is low, and the purity is high . The paint is easy to construct and has excellent paint film properties, especially excellent gloss, adhesion and solvent resistance, and shows comprehensive performance similar to existing paints with similar structures.

Description

technical field [0001] The invention discloses an organic-inorganic hybrid paint and a preparation method thereof. technical background [0002] US Patent US 5677410 (application date: 1996.05.02, authorization date: 1997.10.14) discloses an organic-inorganic hybrid coating and a preparation method thereof. The method is: using tetrahydrofuran as a solvent, 2,4,6,8-tetramethyltetravinylcyclotetrasiloxane and dimethylchlorosilane (or methyldichlorosilane) are catalyzed by chloroplatinic acid The addition reaction of vinyl and silicon hydrogen occurs, followed by hydrolysis or alcoholysis to generate a sol-gel precursor with the following structure. [0003] The chemical reaction process is as follows: [0004] [0005] The above process includes two-step reactions: addition reaction, alcoholysis or hydrolysis reaction. The obtained precursor is then hydrolyzed and condensed with tetraethyl orthosilicate under acidic conditions to form a sol, which is coated on the subst...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D183/14C09D183/04
Inventor 张子勇余祥正
Owner JINAN UNIVERSITY