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Preparation method of polyacrylate/nano silicon dioxide composite emulsion coating material

A technology of nano-silica and polyacrylate, which is applied in the direction of coating, etc., can solve problems such as difficulties, large specific surface area, and high surface energy, and achieve the effects of improving heat resistance, easy access to raw materials, and avoiding agglomeration

Inactive Publication Date: 2016-01-27
GUILIN HEXIN WATERPROOF DECORATION MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the large specific surface area and high surface energy of nano-silica particles, the compatibility with acrylate polymers is poor, and agglomeration easily occurs, which brings great difficulties to its practical application; Dispersion in acrylate polymers has become a key problem that needs to be solved urgently in the preparation of polyacrylate / nano-silica composite emulsions

Method used

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  • Preparation method of polyacrylate/nano silicon dioxide composite emulsion coating material
  • Preparation method of polyacrylate/nano silicon dioxide composite emulsion coating material

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Preparation of modified nano silicon dioxide: add 42.0g orthosilicate ethyl ester and 66.0g dehydrated ethanol in the reactor, heat to 45 ℃, then add the mixture of 0.7g ammoniacal liquor, 8.0g ethanol and 14.0g distilled water, Continue to react at 45°C for 4h to obtain nano-silica alcohol sol, then continue to add 2O.Og silane coupling agent (KH-570), and continue to react at a constant temperature for 4h at 45°C to obtain surface-grafted KH-570 nano Silica sol.

[0021] Preparation of polyacrylate / nano-silica composite emulsion: add 35g of deionized water, 0.6g of sodium dodecylbenzenesulfonate, and 0.3g of nonylphenol polyoxyethylene ether into the reactor, stir for 30min, and then Add 4g of acrylic acid, 40g of butyl acrylate, 16g of methyl methacrylate, and 15g of modified nano-silica sol, and pre-emulsify for 30 minutes to obtain a pre-emulsion. Into the reactor, sequentially add 50g of deionized water, 1.4g of sodium dodecylbenzenesulfonate, 0.7g of nonylphenol...

Embodiment 2

[0024] Preparation of modified nano silicon dioxide: add 31.2g orthosilicate ethyl ester and 48.3g absolute ethanol in the reactor, be heated to 48 ℃, then add the mixture of 0.4g ammoniacal liquor, 6.0g ethanol and 12.0g distilled water, Continue to react at 48°C for 4h to obtain nano-silica alcohol sol, then continue to add 15.0g of silane coupling agent (KH-570), and continue to react at a constant temperature for 4h at 48°C to obtain surface-grafted KH-570 nano Silica sol.

[0025] Preparation of polyacrylate / nano-silica composite emulsion: add 40g of deionized water, 0.8g of sodium dodecylbenzenesulfonate, and 0.4g of nonylphenol polyoxyethylene ether into the reactor, stir for 45min, and then Add 5g of acrylic acid, 30g of butyl acrylate, 25g of methyl methacrylate, and 16.8g of modified nano-silica sol, and pre-emulsify for 45 minutes to obtain a pre-emulsion. Into the reactor, sequentially add 45g of deionized water, 1.8g of sodium dodecylbenzenesulfonate, 0.9g of non...

Embodiment 3

[0028] Preparation of modified nano silicon dioxide: add 37.5g orthosilicate ethyl ester and 58g dehydrated ethanol in the reactor, heat to 50 ℃, then add the mixture of 0.6g ammoniacal liquor, 7.0g ethanol and 16.0g distilled water, then Continue to react at 50°C for 4h to obtain nano-silica alcohol sol, then continue to add 18.0g of silane coupling agent (KH-570), and continue to react at a constant temperature for 4h at 50°C to obtain nanometer silica with surface grafted KH-570. Silica sol.

[0029] Preparation of polyacrylate / nano-silica composite emulsion: add 45g of deionized water, 0.4g of sodium dodecylbenzenesulfonate, and 0.2g of nonylphenol polyoxyethylene ether into the reactor, stir for 40min, and then Add 3g of acrylic acid, 25g of butyl acrylate, 22g of methyl methacrylate, and 10g of modified nano-silica sol, and pre-emulsify for 40 minutes to obtain a pre-emulsion. Into the reactor, sequentially add 40g of deionized water, 1.2g of sodium dodecylbenzenesulfon...

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Abstract

The invention discloses a preparation method of a polyacrylate / nano silicon dioxide composite emulsion coating material. The preparation method comprises the following steps: adding tetraethoxysilane, anhydrous ethanol, ammonium hydroxide and silane coupling agent into deionized water, mixing and heating to obtain modified nano silicon dioxide sol; then adding an emulsifier, an acrylate monomer and an initiator, and preparing a composite emulsion by virtue of an in-situ hydrolysis method; and uniformly mixing the composite emulsion with a dispersing agent, a filler, deionized water, a tackifier and a defoaming agent to prepare the polyacrylate / nano silicon dioxide composite emulsion coating material. The method is simple in process, raw materials are likely to get, the clustering problem of nano silicon dioxide is avoided, and the heat resistance, washing resistance, water and contamination resistance and cohesive force to a basic material of the coating material can be improved.

Description

technical field [0001] The invention belongs to the field of architectural coatings, in particular to a preparation method of a polyacrylate / nano silicon dioxide composite emulsion coating. Background technique [0002] Polyacrylate emulsion not only has the advantages of environmental protection, low cost, and good film-forming performance, but also has excellent weather resistance, flexibility, and adhesion of the coating film, but its heat resistance and hardness are poor. Inorganic nano silica has small size effect, surface interface effect, quantum size effect and macroscopic quantum tunneling effect. Combining it organically with polyacrylate emulsion to prepare organic-inorganic nanocomposite emulsion can significantly improve the hardness of latex film, Heat resistance, impact strength and other properties, thus further expanding its scope of use. However, due to the large specific surface area and high surface energy of nano-silica particles, the compatibility with...

Claims

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Application Information

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IPC IPC(8): C09D133/10C09D7/12
Inventor 黄志强王继发刘泓铭
Owner GUILIN HEXIN WATERPROOF DECORATION MATERIAL
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