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Process for preparing nano silicon dioxide-acrylate composite emulsion

A technology of nano-silica and acrylate, which is applied in the field of preparation of nano-silica-acrylate composite emulsion, which can solve the problems of optical performance degradation, difficult to work, easy to scratch, etc.

Inactive Publication Date: 2005-08-17
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When it is modified with inorganic materials, it is often difficult to work because of the phase separation of inorganic materials
Sol-gel technology is a better way to improve some properties of polyacrylate with inorganic nanophase. The typical modified material is polymethyl methacrylate, which has high transparency and is an excellent organic optical material. It has the advantages of low density, low price, and easy processing and molding, but because its surface is easy to scratch, it leads to a decrease in optical performance, which limits its use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A preparation method of nano silicon dioxide-acrylate composite emulsion, comprising the following steps:

[0026] Step 1: Mix 10-100 parts by mass of small molecule alcohol, 100-800 parts by mass of silane coupling agent, 10-100 parts by mass of deionized water and 1-10 parts by mass of acidic solution, and Stir for 2 to 16 hours at a speed of 800 rpm to obtain a hydrolyzate of the silane coupling agent;

[0027] In this embodiment, small molecule alcohols refer to alcohols with less than 5 carbon atoms, such as: methanol, ethanol, propanol, butanol, and the mass parts can be 20 parts by mass, 32 parts by mass, and 45 parts by mass , 52 parts by mass, 70 parts by mass, 81 parts by mass, 90 parts by mass, the silane coupling agent can be methacryloylpropyl trimethoxysilane, vinyl triethoxysilane, isocyanatopropyl trimethyl One of silanes such as base silane, aminopropyl triethoxy silane, vinyl trimethoxy silane, vinyl tri (2-methoxyethoxy) silane, its mass fraction can...

Embodiment 2

[0035] (1) Preparation of modified nano silica:

[0036] Add 20g of methanol, 15g of methacryloylpropyltrimethoxysilane and 20g of water into the Erlenmeyer flask of a magnetic stirrer, and add 3g of hydrochloric acid with a pH value of 1 at a speed of 300 rpm for 13 hours to prepare Methacryloylpropyltrihydroxysilane. 15g of nano-silica was added to 150g of toluene solution, and under nitrogen protection, 3g of methacryloylpropyl trihydroxysilane was added. Electromagnetic stirring, rotating speed 300 rpm, time 10 hours. The modified silica was obtained by centrifugation, rinsed with ethanol, and then vacuum-dried at 63°C.

[0037] (2) Preparation of nano-silica-acrylate composite emulsion:

[0038] Add 25g of modified silicon dioxide to the four-necked bottle, then add 3g of polyoxyethylene nonylphenol ether and 3g of succinic acid modified polyoxyethylene alkylphenol ether, add 100g of water at the same time, add 3g of hexadecane, and ultrasonically Emulsification, ultr...

Embodiment 3

[0048] (1) Preparation of modified nano silica:

[0049] Add 32g methanol, 35g methacryl propyltrimethoxysilane and 46g water in the Erlenmeyer flask of magnetic stirrer, and add 4.2g of sulfuric acid with a pH value equal to 1.5, the rotating speed is 460 rpm, and the time is 10 hours, thereby Preparation of vinyltriethoxysilane. Add 30g of nano-silica to 260g of toluene solution, under nitrogen protection, add an excess of 4.5g of vinyl trihydroxysilane, stir electromagnetically at a speed of 460 rpm for 7.5 hours, and obtain modified silica by centrifugation , and rinsed with propanol to remove excess hydrolyzate, and then dried under vacuum at 72 °C.

[0050] (2) Preparation of nano-silica-acrylate composite emulsion:

[0051] Add 38g of modified silicon dioxide to the four-necked bottle, then add 4.5g of sodium lauryl sulfate, add 4.5g of cetyl alcohol, add 250g of water, ultrasonic emulsification, ultrasonic frequency is 200kHz ~ 300kHz, output power 500W, time 27 Min...

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Abstract

The preparation process of nanometer composite silica-acrylate emulsion includes the following steps: mixing small molecular alcohol, silane as coupling agent, deionized water and acid solution through stirring; adding the hydrolyzed product of nanometer silica and silane as coupling agent into benzene derivative solvent under the protection of inert gas via stirring; centrifugal separation, flushing with alcohol or acetone and vacuum drying to obtain modified nanometer silica; dispersing acrylate monomer into fine emulsion; mixing the modified silica, anionic or non-ionic emulsifier, stabilizer and water, emulsifying and adding soluble persulfate or liposoluble peroxide; and adding the fine emulsion into the mixed solution to obtain the nanometer composite silica-acrylate emulsion. The present invention has less environmental pollution and is suitable for industrial application.

Description

technical field [0001] The invention relates to the preparation of nano silicon dioxide-acrylate, in particular to a preparation method of nano silicon dioxide-acrylate composite emulsion. technical background [0002] Recently, a lot of research on organic-inorganic composite materials has been carried out. Polyacrylates are a class of polymeric materials with a wide range of uses, often with low hardness and poor mechanical properties. When it is modified with inorganic materials, it is often difficult to work because of the phase separation of inorganic materials. Sol-gel technology is a better way to improve some properties of polyacrylate with inorganic nanophase. The typical modified material is polymethyl methacrylate, which has high transparency and is an excellent organic optical material. It has the advantages of low density, low price, and easy processing and molding, but its use is limited because its surface is easy to scratch, resul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/22C08F2/44C08F20/10C08K3/36C08L33/04
Inventor 储富祥庞久寅王春鹏林明涛
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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