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A kind of anti-precipitation modified silicon dioxide and its preparation method and application

A silica and anti-precipitation technology, applied in the coating and other directions, can solve the problems such as the inability to fully disperse silica, the inability to meet the application performance, and the reduction of the proportion of silica, to achieve superior anti-precipitation performance and uniform modification treatment. , The effect of pigment absorption and balance

Active Publication Date: 2021-07-13
北京航天赛德科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the natural sedimentation process of silica in the resin, as time goes by, silica gradually settles to the bottom of the storage tank, the content of silica in the surface coating decreases, and the silica that can play a role in the film-forming substance A lower proportion of silicon, either as a matting agent or as an ink absorber, will lead to changes in the final application effect
[0004] The existing silica modification treatment methods are mostly hydrophobic modification treatment. However, the silica products after hydrophobic treatment can only be suspended on the surface of the coating in the water-based coating, and cannot fully disperse the silica in all layers of the coating. , making it unusable, therefore, additional modification treatment is required for water-based coatings
At the same time, in oil-based coatings, only through hydrophobic modification to obtain non-sedimented silica additives, it is often accompanied by a significant decrease in extinction efficiency, which cannot meet the requirements of application performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A modified silicon dioxide modified by an acrylic acid copolymer can be prepared by the following method:

[0044]Add 100 kg of silica substrate into the double power mixer, the silica substrate selected is silica dry powder (i.e. white carbon black dry powder) prepared by precipitation method, keep mixed state, stir for 10min, then acrylic acid copolymer 1kg of DISPER2008 and 0.5kg of organic solvent are stirred evenly, atomized by a pressure pump, sprayed evenly into the mixer, kept stirring for 2.5h, and the mixed material is subjected to ultra-fine airflow pulverization, and the average particle size is controlled to 3.5μm to obtain modified Silica finished product 1, can be used as an oil paint additive.

[0045] Wherein, the organic solvent refers to a mixture of the following components in mass percentage: 75% xylene, 15% cyclohexanone and 10% ethylene glycol. Most of the organic solvent is volatilized during the superjet milling process, and the addition of the...

Embodiment 2

[0047] A modified silicon dioxide modified by a polycarboxylic acid copolymer can be prepared by the following method:

[0048] Add 120kg of silica base material to the double power mixer, the silica base material selected is silica dry powder prepared by macroporous silica gel method, keep the mixed state, stir for 10min, mix polycarboxylic acid copolymer DISPER104 18kg with organic 10 kg of solvent was stirred evenly and atomized by a pressure pump, then evenly sprayed into the mixer, kept stirring for 3 hours, and the mixed material was subjected to ultra-fine airflow pulverization, and the average particle size was controlled to 5.5 μm to obtain the finished product 2 of modified silica. Can be used as an oil paint additive.

[0049] Wherein, the organic solvent refers to a mixture of the following components in mass percentage: 75% xylene, 10% cyclohexanone and 15% ethylene glycol. Most of the organic solvent is volatilized during the superjet milling process, and the ad...

Embodiment 3

[0051] A modified silicon dioxide modified by an acrylic copolymer, which can be prepared by the following method:

[0052] Mix and stir 300kg of silica substrate and 700kg of water to form a slurry, stir for 2 hours, add acetic acid to adjust the pH value to 4.5, stir evenly, and keep stirring. Add 30 kg of acrylic copolymer DISPER2009, keep stirring for 2 hours, dry to control the moisture content to ≤4.5%, make the slurry into a base material, and process it into a finished product with ultra-fine airflow pulverization, with an average particle size of 6.5 μm, to obtain the finished product 3 of modified silica, Can be used as water-based paint additive.

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PUM

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Abstract

The invention discloses an anti-precipitation modified silicon dioxide, a preparation method and application thereof, and belongs to the field of paint additives. The modified silica is prepared by modifying the silica base material with a modification aid, and the average particle diameter of the modified silica is 1-10 μm; wherein, the modification aid includes Anti-precipitation modification auxiliary agent, the anti-precipitation modification auxiliary agent is selected from acrylic polymers, polyacrylate copolymers, polycarboxylic acid polymers, polyether modified organosiloxanes, aralkyl modified One or more of organosiloxanes, silicone-modified polyacrylates, high-molecular polyacrylates containing high-efficiency anchor groups, block copolymers containing pigment affinity groups, and modified ureas. The modified silicon dioxide of the present invention can satisfy the application of the storage properties of silicon dioxide in water-based paints and oil-based paints, and avoid precipitation during long-term storage from affecting the final application effect.

Description

technical field [0001] The invention relates to the field of chemical additives, especially coating additives, and in particular to a modified silica for anti-precipitation and its preparation method and application. Background technique [0002] With the development of modern coating technology, the decorative and protective effect of coatings on substrates has derived many varieties and functions. For many types of additives in coatings, some problems will occur more or less during use. As matting agents, enhancers The application effect of silica used in thickeners or ink absorbers is closely related to the state of silica during paint storage. [0003] Due to the natural sedimentation process of silica in the resin, as time goes by, silica gradually settles to the bottom of the storage tank, the content of silica in the surface coating decreases, and the silica that can play a role in the film-forming substance A lower proportion of silicon, either as a matting agent or...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D7/62
CPCC08K3/36C08K9/08
Inventor 张忆张周赫朱晓辉程彦芬操应军李宝德刘阳
Owner 北京航天赛德科技发展有限公司
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