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Preparation method of silica gel flatting agent used for paint

A technology of matting agent and silica gel, applied in the direction of coating, etc., can solve the problems of small pore volume, dispersed pore size distribution, and low transparency of silica gel matting agent, and achieve the effect of high transparency, concentrated pore size distribution, and reasonable system

Inactive Publication Date: 2019-07-02
青岛硕远硅胶科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the problems of small pore volume, too dispersed pore size distribution and low transparency of silica gel matting agents in the prior art, the invention provides a preparation method of silica gel matting agents for paints

Method used

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  • Preparation method of silica gel flatting agent used for paint
  • Preparation method of silica gel flatting agent used for paint

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A kind of preparation method of silica gel matting agent for paint, the preparation step of described silica gel matting agent for paint comprises:

[0023] Step 1, the generation of gel: the Na 2 SiO 3 The sodium silicate olefin solution with a content of 6% and the olefin sulfuric acid solution with a mass concentration of 20% are respectively hit at the reaction nozzle of the reactor under a pressure of 2KPa, so that it is synthesized into a silica sol at a high speed, wherein Na 2 SiO 3 with H 2 SO 4 The molar ratio is 1:1, and the temperature of the reaction system is 40°C;

[0024] Step 2, shrinkage molding of spherical silica sol: the silica sol generated through step 1 is dispersed into the oil bath of the forming column from the umbrella-shaped distribution plate. The temperature of the oil bath is 100 ° C, and it shrinks into a spherical shape by virtue of its own surface tension , Silica sol is extremely unstable under the condition of acidic pH=6.8 and ...

Embodiment 2

[0030] A kind of preparation method of silica gel matting agent for paint, the preparation step of described silica gel matting agent for paint comprises:

[0031] Step 1, the generation of gel: the Na 2 SiO 3 The sodium silicate olefin solution with a content of 6% and the olefin sulfuric acid solution with a mass concentration of 20% are respectively injected into the reaction nozzle of the reactor under a pressure of 1.8KPa to make it synthesize silica sol at a high speed, wherein Na 2 SiO 3 with H 2 SO 4 The molar ratio is 1:1, and the temperature of the reaction system is 35°C;

[0032] Step 2, shrinkage molding of spherical silica sol: the silica sol generated in step 1 is dispersed into the oil bath of the forming column from the umbrella-shaped distribution plate. The sol is extremely unstable under the condition of acidic pH=6.6 and heat, so it quickly coagulates into silica gel within 5s;

[0033] Step 3, acid soaking and washing: in a fume hood with a temperat...

Embodiment 3

[0038] A kind of preparation method of silica gel matting agent for paint, the preparation step of described silica gel matting agent for paint comprises:

[0039] Step 1, the generation of gel: the Na 2 SiO 3 The sodium silicate olefin solution with a content of 6% and the olefin sulfuric acid solution with a mass concentration of 20% are respectively hit at the reaction nozzle of the reactor under a pressure of 2.5KPa to make it synthesize silica sol at a high speed, wherein Na 2 SiO 3 with H 2 SO 4 The molar ratio is 1:1, and the system temperature is 50°C;

[0040]Step 2, shrinkage molding of spherical silica sol: the silica sol generated in step 1 is dispersed into the oil bath of the forming column from the umbrella-shaped distribution plate. The sol is extremely unstable under the condition of acidic pH=7.0 and heat, so it quickly coagulates into silica gel within 7s;

[0041] Step 3, acid soaking and washing: in a fume hood with a temperature of 35°C, soak the si...

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Abstract

The invention discloses a preparation method of a silica gel flatting agent used for paint. The preparation method comprises following steps: 1, a gel is prepared; 2, spherical silica sol shrinkage moulding is carried out; 3, acid immersing and water washing are carried out; 4, ammonia immersing and drying are carried out; 5, high temperature activation is carried out; and 6, grinding sieving arecarried out. The silica gel micro powder flatting agent is white or milk white powder, is nontoxic, is odourless, contains no volatile substance, is large in pore volume, is narrow in pore diameter distribution range, is high in transparency; the average particle size ranges from 6 to 10 <mu>m; the pore volume is 1.95mL / g; the refractive index is 1.4 to 1.5; the oil suction value is 300g / 100g; thesilica gel flatting agent can be widely used in finishing paint, woodenware paint, furniture paint, and solvent type color paint, and possesses controlled rheological performance, bright light shielding performance, sagging resistance, settlement resistance, and improved corrosion resistance.

Description

technical field [0001] The invention relates to the field of silica gel matting agents, in particular to a preparation method of silica gel matting agents for paints. Background technique [0002] Matting agent is a commonly used additive in paints and coatings. It can make the paint film form a fine and rough surface, which can be diffusely reflected by light to achieve a matte or even matte effect, and the matting surface can also cover some surface defects of the utensils, so that the appearance is uniform . [0003] The chemical molecule of silica gel is mSiO 2 ·nH 2 O, does not react with any substance except strong alkali and hydrofluoric acid, insoluble in water and any solvent, non-toxic and tasteless, stable in chemical properties, according to its pore size, it can be divided into macroporous silica gel, coarse porous silica gel, B-type silica gel and fine-pore silica gel. Adding silica gel matting agent to the coating can improve the mechanical strength of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D7/42
CPCC09D7/42
Inventor 刘增强
Owner 青岛硕远硅胶科技有限公司
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