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Preparation method of silica and polyacrylate composite emulsion

A technology of polyacrylate and composite emulsion, which is applied in the field of polyurethane industry, can solve the problems of difficult dispersion, high cost, and easy flocculation, and achieve the effects of improving thermal stability, convenient processing, and simple operation

Inactive Publication Date: 2017-03-15
SHAANXI HI-TECH IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to disperse nano-silica and acrylate emulsion when it is directly mixed, and it is easy to flocculate or even precipitate. The commonly used improvement method is to use silane coupling agent to pretreat nano-silica, but the cost is high, and nano-silica The problem of silicon agglomeration persists

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The preparation method of silica, polyacrylate composite emulsion of the present invention comprises the following steps:

[0016] The first step, the preparation of silica sol

[0017] Add 100mL of methyl orthosilicate to the three-necked flask, mix the 1:1 ammonium hydroxide solution with water under room temperature stirring, slowly drop into the flask over 3 hours, and continue stirring for 3 hours to obtain a solid content of 30%. Methanol silica sol, and then exchange methanol with distilled water to obtain silica sol with a solid content of 25-30wt%;

[0018] The second step is to prepare silica and polyacrylate composite emulsion by semi-continuous in-situ emulsion polymerization

[0019] Sodium dodecylbenzenesulfonate, alkylphenol polydecoxyethylene ether, silica sol, 200mL deionized water, 8 g methyl methacrylate and 8 g N-butyl acrylate were respectively added to the In a 500mL four-neck flask with a reflux condenser, stir at room temperature for 1h, raise ...

Embodiment 2

[0021] The preparation method of silica, polyacrylate composite emulsion of the present invention comprises the following steps:

[0022] The first step, the preparation of silica sol

[0023] Add 100mL of methyl orthosilicate to the three-necked flask, mix the 1:1 ammonium hydroxide solution with water under room temperature stirring, slowly drop into the flask over 3 hours, and continue stirring for 3 hours to obtain a solid content of 30%. Methanol silica sol, and then exchange methanol with distilled water to obtain silica sol with a solid content of 25-30wt%;

[0024] The second step is to prepare silica and polyacrylate composite emulsion by semi-continuous in-situ emulsion polymerization

[0025] Sodium dodecylbenzenesulfonate, alkylphenol polydecoxyethylene ether, silica sol, 200mL deionized water, 8 g methyl methacrylate and 8 g N-butyl acrylate were respectively added to the In a 500mL four-neck flask with a reflux condenser, stir at room temperature for 1h, raise ...

Embodiment 3

[0028] The preparation method of silica, polyacrylate composite emulsion of the present invention comprises the following steps:

[0029] The first step, the preparation of silica sol

[0030] Add 100mL of methyl orthosilicate to the three-necked flask, mix the 1:1 ammonium hydroxide solution with water under room temperature stirring, slowly drop into the flask over 3 hours, and continue stirring for 3 hours to obtain a solid content of 30%. Methanol silica sol, and then exchange methanol with distilled water to obtain silica sol with a solid content of 25-30wt%;

[0031] The second step is to prepare silica and polyacrylate composite emulsion by semi-continuous in-situ emulsion polymerization

[0032] Sodium dodecylbenzenesulfonate, alkylphenol polydecoxyethylene ether, silica sol, 200mL deionized water, 8 g methyl methacrylate and 8 g N-butyl acrylate were respectively added to the In a 500mL four-neck flask with a reflux condenser, stir at room temperature for 1h, raise ...

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Abstract

The invention relates to the industrial field of polyurethane, and particularly relates to a preparation method of silica and polyacrylate composite emulsion. The preparation method comprises the following steps: preparation of silica sol: adding 100 mL of tetramethyl orthosilicate into a three-mouth flask, stirring at room temperature and mixing ammonium hydroxide solution (1:1) with water, slowly dropwise adding into the flask within 3h, continuously stirring for 3h to obtain methanol silica sol with solid content of 30%, and exchanging out methanol through distilled water to obtain silica sol with solid content of 25-30wt%; preparation of silica and polyacrylate composite emulsion through using a semicontinuous in-situ emulsion polymerization method: respectively adding sodium dodecyl benzene sulfonate, alkylphenol polydecoxyethylene ether, silica sol, 200mL of deionized water, 8g of methyl methacrylate and 8g of N-butyl acrylate into a mechanical agitator. The preparation method is simple to operate, and convenient to process, and while the tensile strength and breakage elongation of a composite emulsion membrane are increased, the water absorption is reduced, and the thermal stability performance of the composite emulsion membrane can be enhanced.

Description

technical field [0001] The invention relates to the field of polyurethane industry, in particular to a preparation method of silicon dioxide and polyacrylate composite emulsion. Background technique [0002] Polyacrylate emulsion materials have many excellent properties, such as low price, strong plasticity, almost no volatile gas (VOC) and excellent weather resistance, etc., but their hydrophobic properties are not good, water resistance is weak, mechanical properties are general, Disadvantages such as poor heat resistance limit its wider application. Therefore, improving the hydrophobic properties, mechanical properties and thermal properties of polyacrylate materials has become a research hotspot in this field. [0003] Combining polyacrylate emulsion with nano-inorganic particles, using the special properties of nano-inorganic particles can improve the mechanical and thermal properties of polyacrylate emulsion after film formation. Among them, adding nano-silica to poly...

Claims

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Application Information

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IPC IPC(8): C09D133/12C09D133/08C09D7/12C08F220/14C08F220/18
CPCC08F220/14C08F220/18C08F220/1804C08L2201/08C09D7/61C09D133/08C09D133/12C08L71/02C08K3/36
Inventor 王耀斌
Owner SHAANXI HI-TECH IND CO LTD
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