Method for producing high-purity micro-silica plastics anti-block agent

A technology of micropowder silica gel and production method, which is applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve the problems of large particle size of anti-blocking agent, complicated process of anti-blocking agent, unsuitability for high-grade plastic film production and use, etc. Achieve the effect of small particle size, reduce the number of fish eyes, and reduce product cost

Inactive Publication Date: 2009-05-06
山西天一纳米科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The anti-blocking agent manufactured by this method has a complicated process and large particle size, which is not suitable for the production and use of high-grade plastic films.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 5PPM iron content, 10% concentration of water glass 5M 3 , into the reactor. Slowly add dilute sulfuric acid with a concentration of 25%-35% into the reactor at a speed of 3 cubic meters per hour under stirring conditions, and continuously test the pH value of the reactant in the reactor during the addition of sulfuric acid until the pH value of the reactant in the reactor = 1, stop adding sulfuric acid. Stirring was continued for about one hour, and the pH value in the kettle was kept to be monitored and maintained at =1. At this time, the reactant in the kettle is sodium sulfate Na 2 SO 4 Aqueous solution and silicic acid H 4 SiO 4 . The silicic acid in it is colloidal. Wash the above-mentioned reactant with pure water with a conductivity of 25 μs / cm to remove the sodium sulfate therein, and it is qualified if the conductivity is less than 40 μs / cm. After washing, the mixture of silicic acid colloid and water is obtained, and most of the water is removed by ce...

Embodiment 2

[0031] Iron content 5PPM, 10% water glass 10M 3 , into the reactor. Slowly add dilute sulfuric acid with a concentration of 25-35% into the reactor at a rate of 3 cubic meters per hour under stirring conditions, and continuously test the pH value of the reactant in the reactor until the pH value of the reactant in the reactor is 1 When, stop adding sulfuric acid. Stirring was continued for about one hour, and the pH value in the kettle was kept to be monitored and maintained at =1. At this time, the reactant in the kettle is sodium sulfate Na 2 SO 4 Aqueous solution and silicic acid H 4 SiO 4 . The silicic acid in it is colloidal. Wash the above-mentioned reactant with pure water with a conductivity of 30 μs / cm to remove the sodium sulfate therein, and it is qualified if the conductivity reaches 35 μs / cm. After washing, the mixture of silicic acid colloid and water is obtained, and most of the water is removed by centrifugation, so that the silicic acid content reaches...

Embodiment 3

[0033] Iron content 5PPM, water glass 8M with a concentration of 10% 3 , into the reactor. Slowly add dilute sulfuric acid with a concentration of 25-35% into the reactor at a rate of 3 cubic meters per hour under stirring conditions, and continuously test the pH value of the reactant in the reactor until the pH value of the reactant in the reactor is 1 When, stop adding sulfuric acid. Stirring was continued for about one hour, and the pH value in the kettle was kept to be monitored and maintained at =1. At this time, the reactant in the kettle is sodium sulfate Na 2 SO 4 Aqueous solution and silicic acid H 4 SiO 4. The silicic acid in it is colloidal. Wash the above-mentioned reactant with pure water with a conductivity of 40 μs / cm to remove sodium sulfate therein, and it is qualified if the conductivity reaches 35 μs / cm. After washing, the mixture of silicic acid colloid and water is obtained, and most of the water is removed by centrifugation, so that the silicic ac...

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PUM

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Abstract

The invention provides a production method of a high-purity micro-powder silica plastic anti-block agent; high-purity water glass reacts with sulfuric acid to gain sodium sulfate and silicic acid; the sodium sulfate is washed by water to gain silicious colloid which is centrifugally dehydrated, and dried by micro-wave to gain pure SiO2 powder which is crushed by an airflow crusher to gain the high-purity micro-powder silica plastic anti-block agent. The production method of the high-purity micro-powder silica plastic anti-block agent has simple process, high purity and small particle size of the gained products, is suitable for the production and use of top-class plastic films, can obviously improve the top-grade product rate, reduces the cost of the product, improves the tensile yielding strength of the film to 13.5-14.5MPa generally, improves the tensile breaking elongation rate of the film to about 1400 percent, and obviously reduces the fish eye number of the film.

Description

technical field [0001] The invention relates to a production method of amorphous silicon dioxide, in particular to a production method of micropowder silica gel widely used in openings of plastic films. Background technique [0002] In the production of plastic film, it is usually necessary to add a certain amount of anti-blocking agent to prevent serious adhesion during or after the film production process, such as winding, slitting, packaging, etc., or even unusable. The development of modern plastics industry is characterized by automation, high speed and high quality. During high-speed processing, static electricity is generated due to friction, which will cause serious adhesion between the films, and as the transparency and processing temperature of the film increase, it is more likely to form clumping and adhesion, which directly affects the quality of plastic processing. Traditionally, amine slip agents are used to solve the sticking problem in the production process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/021C08K3/36
Inventor 张原僖周日升庚廷瑞赵建卿梁建强王洁
Owner 山西天一纳米科技股份有限公司
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