Preparation method of high-oil-absorption high-reinforcement silicon dioxide for rubber products

A technology for rubber products and silica, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve problems such as the urgent need to improve the reinforcing ability of silica

Inactive Publication Date: 2017-08-08
FUJIAN SANMING JUFENG CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in terms of rubber reinforcement effect alone, the reinforcement ability of silica needs to be improved urgently.

Method used

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Embodiment Construction

[0020] In order to make the purpose, technical solution and advantages of the present invention clearer, the implementation manners of the present invention will be further described in detail below.

[0021] The invention provides a method for preparing high oil-absorbing and high-reinforcement silica for rubber products, which comprises the following steps:

[0022] S1. Precisely prepare the concentration of water glass in the preparation tank to 0.995~1.005 mol / l, and control the temperature at 25~50°C;

[0023] S2. Transfer 30m3 of process hot water from the warm water tank, add 3.5m3 of water glass from the refining tank into the reaction kettle, raise the temperature to 60°C, and adjust the concentration of the bottom liquid to 0.100~0.105 mol / l;

[0024] S3, one-step acidification: add sulfuric acid and dilution water to the reaction kettle while stirring, the acid flow rate is 0.50 m3 / h, the dilution water flow rate is 3.5 m3 / h, control the pH between 6.5~7.0, stop sti...

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PUM

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Abstract

The invention discloses a preparation method of high-oil-absorption high-reinforcement silicon dioxide for rubber products. The preparation method comprises the steps: firstly, accurately preparing water glass in a preparing tank; then, transferring processing hot water into a reactor from a warm water tank, transferring water glass into the reactor from a refining tank, heating the temperature to 60 DEG C; adding sulfuric acid and dilute water into the reactor while carrying out stirring, controlling pH to 6.5 to 7.0, then, stopping stirring, and carrying out aging for 30 minutes; starting to carry out stirring, meanwhile, heating the temperature to 85 DEG C, and starting to carry out flow merging; firstly, adding flow-merged water glass until the pH value is 9 to 10, then, adding sulfuric acid, and controlling the pH value to 9.5 to 10.5; carrying out stirring uninterruptedly after flow merging ends, adding the sulfuric acid and the dilute water for post-acidification, and controlling the pH value to 4.8 to 5.3 at an end; carrying out aging and stirring for 20 minutes, and ending the reaction. The silicon dioxide prepared by the preparation method has the characteristics of high specific surface area and high oil absorption and is low in loss on ignition and high in pH value, so that the vulcanization time of the rubber products is shortened by 50% or more, and the processing efficiency is greatly increased.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a preparation method of high oil-absorbing and high-reinforcing silicon dioxide for rubber products. Background technique [0002] Precipitated silica is commonly known as white carbon black, also known as hydrated silicic acid and light silica. Its chemical expression is generally written as mSiO2 nH2O, and its appearance is white highly dispersed amorphous powder and microbeads. Precipitated silica is widely used in rubber products, tires, feed additives, food additives, paint matting agents, papermaking, silicone rubber, toothpaste abrasives, inks and many other industries. [0003] Silica is used as an excellent reinforcing agent and filler in rubber applications, which can greatly improve the physical properties of the rubber compound and reduce the hysteresis of the rubber compound. In the tire industry, silica can reduce tire rolling resistance without losing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/143C08K3/36C08L21/00
CPCC01B33/143C01P2006/12C08K3/36C08L21/00
Inventor 万火平
Owner FUJIAN SANMING JUFENG CHEM
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