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Silicon dioxide for reinforcing rice milling rubber roller and preparation process of silicon dioxide

A silica and preparation technology, applied in the direction of silica, silica, etc., can solve problems such as unstable quality, limited international market share of rubber roller products, general wear resistance performance, etc.

Pending Publication Date: 2021-05-28
SHANDONG LINK SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the currently used domestically produced silica is made into a rubber compound, most of the hardness is low, the wear resistance is average, and the high reinforcing performance of silica is not fully reflected; although some silica has high Reinforcement and high wear resistance, but in the process of rubber processing, it is slow to eat materials, difficult to disperse, and poor processing performance, resulting in high manufacturing costs and unstable quality, which limits the international market share of rubber roller products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] at 55m 3 Add 20m of liquid sodium silicate with a modulus of 3.0 and a concentration of 20 degrees Baume in the synthesis kettle 3 , the stirring speed is 80r / min, add 200kg of solid sodium chloride, feed steam to raise the temperature to 90°C, and then start to 12.0m 3 Add 35% sulfuric acid at a speed of 10.0, stop adding acid when the pH value of the reaction solution is 10.0, then stop stirring, leave it to age for 60 minutes, start stirring again, and start stirring at 5.0m 3 Add 35% sulfuric acid at a speed of 1 / h, and stop adding acid when the pH value of the reaction solution is 5.0. Then put the thin slurry into the filter, and when the filtrate no longer flows out in a large amount, use process water to wash the filter cake. When the drainage conductivity is 5.0ms / cm, stop washing, transfer the filter cake to the pulper, and stir until After a good flow state, the solid content was detected to be 23.8%. Drying is realized in a pressure drying tower with a sp...

Embodiment 2

[0081] at 71m 3 Add 30m of liquid sodium silicate with a modulus of 3.3 and a concentration of 30 degrees Baume into the synthesis kettle 3 , the stirring speed is 110r / min, add 500kg of solid sodium chloride, feed steam to raise the temperature to 90°C, and then start to 20.0m 3 Add 55% sulfuric acid at a rate of 1 / h. When the pH value of the reaction solution is 11.0, stop adding acid, then stop stirring, and leave to stand for aging for 120 minutes. Turn on the stirring again, at 8.0m 3 Add 55% sulfuric acid at a speed of 7.0 per hour, stop adding acid when the pH value of the reaction solution is 7.0, then put the thin slurry into the filter, and when the filtrate no longer flows out in large quantities, use process water to wash the filter cake until the drainage conductivity When the rate is 8.0ms / cm, stop washing. Transfer the filter cake to the pulping machine, stir it into a good flow state, detect the solid content of 22.5%, and realize drying in the pressure dryi...

Embodiment 3

[0096] at 55m 3 Add 20m of liquid sodium silicate with a modulus of 3.0 and a concentration of 20 degrees Baume into the synthesis kettle 3 , the stirring speed is 80r / min, add 200kg of solid sodium chloride, feed steam to raise the temperature to 90°C, and then start to 12.0m 3 Add 35% sulfuric acid at a speed of 1 / h, and keep stirring until the pH value of the reaction solution is 10.0. Then at 5.0m 3 Add 35% sulfuric acid at a speed of 5.0 per hour, stop adding acid when the pH value of the reaction solution is 5.0, then put the thin slurry into the filter, and when the filtrate no longer flows out in large quantities, use process water to wash the filter cake until the drainage conductivity When the rate is 5.0ms / cm, the washing is stopped, and the filter cake is transferred to the pulper. After stirring in a good flow state, the solid content was detected to be 20.6%, and the drying was realized in a pressure drying tower with a spray pressure of 1.7MPa, an inlet hot a...

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Abstract

The invention discloses silicon dioxide for reinforcing a rice milling rubber roller and a preparation method of the silicon dioxide. The DBP absorption amount of the silicon dioxide is 2.2-2.8 ml / g; the bulk specific gravity is 0.24 to 0.30 g / ml; the 100-mesh screen underflow rate is less than or equal to 20%; the pH value (10% suspension) is 6.5-7.5; the BET specific surface area is 200-250 m<2> / g; the specific surface area of CTAB is 195-245 m<2> / g; and the ratio of the BET to the CTAB is 1.0 to 1.05. A specially designed synthesis process is adopted in the chemical reaction stage and comprises setting of the concentrations of raw materials sodium silicate and sulfuric acid and a feeding method of the two raw materials, selection of a structure control agent and the dosage thereof, and special setting of synthesis time, especially standing and aging time, so that the precipitated silicon dioxide generated by the reaction of the sodium silicate and the sulfuric acid has a relatively large BET specific surface area and a relatively large CTAB specific surface area. The high reinforcing performance and good dispersity of the silicon dioxide product are guaranteed, the silicon dioxide product has smooth processability in the rubber material processing process, the rubber roller product is endowed with proper hardness and excellent wear resistance, and the good processability of the rubber roller is guaranteed.

Description

technical field [0001] The invention relates to the technical field of silicon dioxide production, in particular to silicon dioxide for reinforcing rice milling rubber rollers and a preparation process thereof. Background technique [0002] With the cost control of rice processing enterprises, enterprises have put forward higher requirements for the reinforcement and wear resistance of rice milling rubber rollers. High reinforcement and high wear resistance of rice milling rubber rollers can increase the rice roughness rate. It can greatly improve the quality of rice products, reduce the labor intensity and production efficiency of workers in rice processing enterprises, save production costs, and greatly increase the benefits of rice processing enterprises. Silica is used as a filling and reinforcing agent, which can improve the strength and wear resistance of rice milling rubber rollers. However, after the currently used domestically produced silica is made into a rubber ...

Claims

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Application Information

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IPC IPC(8): C01B33/12C08K3/36
CPCC01B33/12C08K3/36C01P2006/10C01P2006/12C01P2006/80
Inventor 李祥凯胡金星高海明蔡新华王鹏国
Owner SHANDONG LINK SCI & TECH CO LTD
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