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Preparation method of high transparent precipitated silica for plastic anti-block agent

A technology of precipitated silica and anti-blocking agent, which is applied in the treatment of dyed polymer organic compounds, fibrous fillers, dyed organic silicon compounds, etc. It can solve the problem of poor surface properties, poor compatibility, and difficulty in dispersing plastic films. problem, to achieve the effect of improved transparency, increased compatibility, and excellent comprehensive indicators

Inactive Publication Date: 2012-12-19
FUJIAN SANMING TONGSHENG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since there are a large number of hydroxyl groups on the surface of precipitated silica, it is a hydrophilic substance that has poor compatibility with polyethylene and is difficult to disperse, thus deteriorating the surface properties of plastic films.
However, with the gradual increase in the quality requirements for polyethylene plastic films, the performance requirements for transparency, openness, fish eyes, tensile strength, and tear strength are becoming more and more stringent. There is a direct relationship between the performance of silicon dioxide, in which the purity and average particle size of silicon dioxide are the main factors affecting the transparency and opening performance of polyethylene film, and the pore characteristics of silicon dioxide affect the opening efficiency of polyethylene film

Method used

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  • Preparation method of high transparent precipitated silica for plastic anti-block agent
  • Preparation method of high transparent precipitated silica for plastic anti-block agent
  • Preparation method of high transparent precipitated silica for plastic anti-block agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) Dilute the industrial sodium silicate with a modulus of 3.0 to a concentration of silicon dioxide with a mass content of 5% industrial sodium silicate solution; at an initial temperature of 45 °C, dropwise add a 95% mass content of inorganic acid solution, inorganic The acid is selected from one or more of sulfuric acid, nitric acid, and phosphoric acid; the addition amount is 20% of the total amount of sulfuric acid used, then the temperature is raised to 80-90 ° C, and the temperature is maintained for 1-1.5 hours, and the remaining sulfuric acid is added dropwise at this temperature, Keep the final adjusted pH value of 3-4;

[0022] 2) washing, the washing method is selected from one or more of water washing and alcohol washing, and washing with water until the mass content of sodium ions is below 0.1%;

[0023] 3) Beat the washed filter cake with high-speed stirring, add a surfactant, the surfactant is selected from γ-chloropropyltrimethoxysilane, and the additio...

Embodiment 2

[0029] 1) Dilute the industrial sodium silicate with a modulus of 3.1 to a concentration of silicon dioxide with a mass content of 6% industrial sodium silicate solution; at an initial temperature of 50 °C, dropwise add an inorganic acid solution with a mass content of 95%, inorganic acid solution The acid is selected from one or more of sulfuric acid, nitric acid and phosphoric acid; the add-on is 22% of the total amount of sulfuric acid used, then the temperature is raised to 80-90 ° C, kept for 1-1.5 hours, and the remaining sulfuric acid is added dropwise at this temperature, Keep the final adjusted pH value of 3-4;

[0030] 2) washing, the washing method is selected from one or more of water washing and alcohol washing, and washing with water until the mass content of sodium ions is below 0.1%;

[0031] 3) Beat the washed filter cake with high-speed stirring, add a surfactant, the surfactant is selected from fatty alcohol polyoxyethylene ether, and the addition amount is ...

Embodiment 3

[0037] 1) Dilute the industrial sodium silicate with a modulus of 3.2 to a concentration of silicon dioxide with a mass content of 7% industrial sodium silicate solution; at an initial temperature of 55 °C, dropwise add an inorganic acid solution with a mass content of 95%. The acid is selected from one or more of sulfuric acid, nitric acid, and phosphoric acid; the addition amount is 24% of the total amount of sulfuric acid used, and then the temperature is raised to 80-90 ° C, maintained for 1-1.5 hours, and the remaining sulfuric acid is added dropwise at this temperature, Keep the final adjusted pH value of 3-4;

[0038] 2) washing, the washing method is selected from one or more of water washing and alcohol washing, and washing with water until the mass content of sodium ions is below 0.1%;

[0039] 3) Beat the washed filter cake with high-speed stirring, add a surfactant, and the surfactant is selected from fatty alcohol polyoxyethylene ether and polyoxyethylene sorbitan...

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Abstract

The invention discloses a preparation method of high transparent precipitated silica for plastic anti-block agent. The preparation method takes industrial sodium silicate as raw material to produce the precipitated silica which is excellent in composite indicators such as chemical purity, pore property, average particle size, volatile matter and the like so as to be used as the plastic anti-block agent. In the whole technical process, strict technical raw materials are not needed to be used, and the reaction time is 2-5h. A great deal of hydroxyl exists on the surface of the silica, and the grafting reaction is carried out between the silica and surface active material in the pulping process, so that the compatibility between the silica and polyvinyl is improved, and the transparency of the silica in the polyvinyl is remarkably improved.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a preparation method of high-transparency precipitated silica for plastic opening agents. Background technique [0002] With the rapid development of the national economy, the demand for synthetic materials such as plastics has grown rapidly, driving the production of polyethylene into a historical peak. Polyethylene films are widely used in food packaging, medical packaging, stationery packaging and agricultural films. . However, during the process of rolling and storing the plastic film, the layers of the film are prone to adhesion due to heat or pressure, which will affect the unwinding and unwinding speed of the subsequent processing, and it cannot be unrolled for use. The main reason for the adhesion of plastic films is that after the film is formed, there are a large number of exposed molecular chains on the surface. After the two films are closed, the macromol...

Claims

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Application Information

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IPC IPC(8): C09C1/28C09C3/12C09C3/10C09C3/08
Inventor 卢元方陈家茂余惠华赵晓彬陈欣鑫
Owner FUJIAN SANMING TONGSHENG CHEM
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