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Modified nano-silica sol containing rich hydrophilic groups and preparation method of modified nano-silica sol

A technology of nano-silica and hydrophilic groups, which is applied in the direction of coating, etc., can solve the problems of powder characteristics that are easy to bring in impurities, low production efficiency, wide particle size distribution, etc., and achieve simple and controllable preparation methods, reduce Effect of cost, good hydrophilicity and oleophobicity

Active Publication Date: 2016-07-27
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is simple but easy to bring in impurities. The characteristics of the powder are difficult to control, the preparation efficiency is low and the particle size distribution is wide

Method used

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  • Modified nano-silica sol containing rich hydrophilic groups and preparation method of modified nano-silica sol
  • Modified nano-silica sol containing rich hydrophilic groups and preparation method of modified nano-silica sol
  • Modified nano-silica sol containing rich hydrophilic groups and preparation method of modified nano-silica sol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A modified nano-silica sol rich in hydrophilic groups, comprising the following raw materials:

[0025]

[0026] Its specific preparation steps of the nano-silica sol modified by rich hydrophilic groups are:

[0027] (1), weigh each raw material in proportion, then in a 250ml there-necked flask with a thermometer and a stirrer, add 18g of nano silicon dioxide and 78.8g of absolute ethanol, stir at 40°C for 10 minutes, then Add 0.2g of vinyltriethoxysiloxane and stir again for 30 minutes;

[0028] (2), then add 0.5g maleic anhydride, 1g acrylic acid, 0.5g methacrylic acid, 0.5g hydroxyethyl acrylate to the there-necked flask, stir thoroughly for 10 minutes, add 0.1g dibenzoyl peroxide, heat up to boiling;

[0029] (3) Boiling and reacting for 3 hours, keeping warm for 30 minutes, then adding polyvinyl alcohol and sorbitol, and stirring until completely dissolved. That is, the hydrophilic group-rich modified nano-silica alcohol sol is prepared.

Embodiment 2

[0031] A modified nano-silica sol rich in hydrophilic groups, comprising the following raw materials:

[0032]

[0033]

[0034] The preparation method is the same as the steps in Example 1.

Embodiment 3

[0036] A modified nano-silica sol rich in hydrophilic groups, comprising the following raw materials:

[0037]

[0038] The preparation method is the same as the steps in Example 1.

[0039] In order to test the strength of its hydrophilicity, the superhydrophilic coating was prepared with the nano-silica sol modified by the rich hydrophilic group and other raw materials. In the comparative example, only the nano-silica sol modified by the rich hydrophilic group The silica sol raw material is replaced by conventional nano-silica sol, the addition amount remains unchanged, the composition and content of the remaining raw materials remain unchanged, the preparation method is the same, and then the water contact angle of the prepared coating is inspected, and the detection method is the same.

[0040] At room temperature, first add 20 g of nano-silica sol modified by rich hydrophilic groups, 0.5 g of polyvinyl alcohol solution, 1 g of sorbitan solution, 0.5 g of polyethylene g...

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Abstract

The invention belongs to the technical field of sol preparation and particularly relates to modified nano-silica sol containing rich hydrophilic groups and a preparation method of the modified nano-silica sol. The sol is prepared from raw materials in percentage by mass as follows: 18%-25% of nano silica, 0.5%-1% of maleic anhydride, 1%-2% of acrylic acid, 0.5%-1% of methacrylic acid, 0.5%-1% of hydroxyethyl acrylate, 0.2%-0.5% of triethoxyvinylsilane, 0.1%-0.3% of polyvinyl alcohol, 0.3%-0.6% of sorbitol, 0.1% of benzoyl peroxide and the balance of absolute ethyl alcohol, and the sum of the total mass in percentage is 100%. A large quantity of hydroxyl and carboxyl are enriched on the surfaces of nano-silica particles, so that modified nano-silica sol has better hydrophilia and lipophobicity; the preparation method is simple and controllable, the prepared modified nano-silica sol containing the rich hydrophilic groups can be applied to preparation of coating materials with special performance, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of sol preparation, in particular to a hydrophilic group-rich modified nano-silica sol and a preparation method thereof. Background technique [0002] Nano silica is an inorganic chemical material, commonly known as white carbon black. Because it is ultra-fine and nanoscale, with a size range of 1-100nm, it has many unique properties, such as optical properties against ultraviolet rays, and can improve the anti-aging, strength and chemical resistance of other materials. Very versatile. Nanoscale silicon dioxide is an amorphous white powder, non-toxic, tasteless, and non-polluting. Its microstructure is spherical, and it is a quasi-granular structure of floc and net, and it is insoluble in water. [0003] nano-SiO 2 The preparation method is divided into two kinds of physical method and chemical method. [0004] (1) Physical method [0005] The physical method generally refers to the mechanical pulveriza...

Claims

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Application Information

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IPC IPC(8): C08F292/00C08F230/08C08F222/06C08F220/06C08F220/28C09D151/10C09D7/12
CPCC09D7/63C09D151/10C08F292/00C08L2205/035C08L29/04C08L71/00C08K5/053C08F230/08C08F220/281
Inventor 张发兴卫晓利孙亚丽
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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