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Preparation method of precipitated silicon dioxide for high-resilience transparent silicon rubber

A technology of precipitated silica and resilience, applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve the problem of poor resilience and transparency of silicone rubber, high production cost of fumed silica, and structural control In order to achieve the effects of good resilience, simple and environmentally friendly preparation process, and low production cost

Inactive Publication Date: 2021-08-06
GUANGZHOU FEIXUE MATERIAL TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This rubber has better resilience, mechanical strength and stability, but the production cost of fumed silica used in its formula is relatively high, and the production process is poor in environmental protection, which is not conducive to large-scale industrial production
[0005] The patent publication No. CN162144A discloses a silicone rubber composition, the formulation of which includes polyorganosiloxane or organosilane or a mixture thereof, precipitated silica, curing agent and other components. Good storage stability due to less temporal plastic degradation, good workability due to less adhesion to rolls, and improved resilience after curing, but poor transparency
[0006] In summary, in the prior art, the addition of precipitated silica to silicone rubber leads to poor resilience and transparency of silicone rubber, long time for raw rubber to powder, large addition of structural control agents, and high production costs. advanced technical issues

Method used

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  • Preparation method of precipitated silicon dioxide for high-resilience transparent silicon rubber
  • Preparation method of precipitated silicon dioxide for high-resilience transparent silicon rubber
  • Preparation method of precipitated silicon dioxide for high-resilience transparent silicon rubber

Examples

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Embodiment 1

[0032] Example 1, a preparation method of precipitated silica for high resilience silicone rubber

[0033] A preparation method of precipitated silica for high resilience silicone rubber, comprising the following steps:

[0034] S1. After liquefying solid sodium silicate with a modulus of 1.5 at high temperature, add water to form a sodium silicate solution with a concentration of 2.0mol / L;

[0035] S2, configuration concentration is the sulfuric acid solution of 2.0mol / L;

[0036] S3, add 8m to the reactor 3 into tap water, then add 5m 3 The sodium silicate solution prepared in step S1 is heated to 80°C, the stirring device is turned on and the stirring frequency is set to 25Hz, and the sulfuric acid solution prepared in step S2 is added dropwise while stirring, and the dropping speed of the sulfuric acid solution is 3m 3 / h, the control reaction terminal pH value is 8.0;

[0037] S4, continue to drip the sodium silicate solution that step S1 makes and the sulfuric acid s...

Embodiment 2

[0039] Example 2, a preparation method of precipitated silica for high resilience silicone rubber

[0040] A preparation method of precipitated silica for high resilience silicone rubber, comprising the following steps:

[0041] S1. After liquefying solid sodium silicate with a modulus of 3.5 at high temperature, add water to form a sodium silicate solution with a concentration of 3.0mol / L;

[0042] S2, configuration concentration is the sulfuric acid solution of 4.8mol / L;

[0043] S3, add 12m to the reactor 3 into tap water, then add 7.5m 3 The sodium silicate solution prepared in step S1 is heated to 95°C, the stirring device is turned on and the stirring frequency is set to 30Hz, and the sulfuric acid solution prepared in step S2 is added dropwise while stirring, and the dropping speed of the sulfuric acid solution is 8m 3 / h, the control reaction terminal pH value is 10.5;

[0044] S4, continue to drip the sodium silicate solution that step S1 makes and the sulfuric ac...

Embodiment 3

[0046] Example 3, a preparation method of precipitated silica for high resilience silicone rubber

[0047] A preparation method of precipitated silica for high resilience silicone rubber, comprising the following steps:

[0048] S1. After liquefying solid sodium silicate with a modulus of 2.5 at high temperature, add water to form a sodium silicate solution with a concentration of 2.5mol / L;

[0049] S2, configuration concentration is the sulfuric acid solution of 3.2mol / L;

[0050] S3, add 10m to the reactor 3 into tap water, then add 6.1m 3 The sodium silicate solution prepared in step S1 is heated to 87°C, the stirring device is turned on and the stirring frequency is set to 28Hz, and the sulfuric acid solution prepared in step S2 is added dropwise while stirring, and the dropping speed of the sulfuric acid solution is 6m 3 / h, the control reaction terminal pH value is 9.2;

[0051] S4, continue to drip the sodium silicate solution that step S1 makes and the sulfuric aci...

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Abstract

The invention belongs to the technical field of silicon dioxide, and particularly relates to a preparation method of precipitated silicon dioxide for high-resilience transparent silicon rubber. The precipitated silicon dioxide for the high-resilience silicon rubber, provided by the invention, is prepared by a two-step method by taking water as a reaction base solution, taking a sodium silicate solution and a sulfuric acid solution with modulus of 1.5-3.5 as reaction raw materials and taking an organosilicon compound with mass fraction of 0.01-0.1% as an auxiliary agent. The specific surface area of the precipitated silicon dioxide for the high-resilience silicon rubber is 150-210 m < 2 > / g, the oil absorption value is 150-210 mL / 100 g, the precipitated silicon dioxide is applied to the silicon rubber, the resilience of the silicon rubber is 60-75%, and the silicon rubber is transparent and free of impurities. In addition, the preparation process of the precipitated silicon dioxide for the high-resilience silicon rubber is simple and environment-friendly, the production cost is relatively low, and industrial production is easy to realize.

Description

technical field [0001] The invention belongs to the technical field of silicon dioxide, and in particular relates to a preparation method of precipitated silicon dioxide for high-resilience transparent silicone rubber. Background technique [0002] Precipitated silica is mainly prepared by co-precipitation method, which belongs to amorphous mesoporous material, and the raw material is generally water glass (Na 2 SiO 3 ) and sulfuric acid (H 2 SO 4 ), the by-product is sodium sulfate (Na 2 SO 4 ), recyclable, simple production process, environmental protection, and low cost. Compared with fumed silica, the cost of precipitated silica is lower, and the production process is more environmentally friendly. [0003] Precipitated silica is an amorphous porous structure with abundant hydroxyl groups on the surface and adjustable specific surface area. Adding silica to silicone rubber, because silica forms a three-dimensional network structure in the system, and silica can fo...

Claims

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Application Information

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IPC IPC(8): C01B33/193C08K7/26C08L83/04
CPCC01B33/193C01P2004/61C01P2006/12C08K7/26C08K2201/005C08L83/04
Inventor 梁少彬谭昊存张云龙陈盈欣
Owner GUANGZHOU FEIXUE MATERIAL TECH
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