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Preparation method of low-oil-absorption nano silicon dioxide for high-elasticity silicone rubber

A nano-silica, silicone rubber technology, applied in the direction of silica, aluminum hydroxide preparation, silicon oxide, etc., can solve the problem of low rebound rate

Active Publication Date: 2020-10-23
FUJIAN YUANXIANG CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High-resilience and low-compression deformation products are mainly used in sealing products in a wide range of applications. The high-temperature vulcanized silicone rubber in the prior art cannot meet the special requirements of some products on the market due to its low rebound rate, such as shaft seal rings, Gaskets, sealing rings / pads / strips, miscellaneous joints and automotive connections and sealing components, etc., so it is necessary to further improve the elastic properties of silicone rubber

Method used

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  • Preparation method of low-oil-absorption nano silicon dioxide for high-elasticity silicone rubber
  • Preparation method of low-oil-absorption nano silicon dioxide for high-elasticity silicone rubber

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preparation example Construction

[0014] The invention provides a method for preparing nano-silica for high-elasticity silicone rubber, comprising the following steps:

[0015] After the bottom water is warmed up, add 1-5wt% solid sodium sulfate in the bottom water and stir to dissolve, then add water glass solution accounting for 30-50% of the bottom water volume and stir evenly to obtain a reaction solution, respectively control the flow rate to 3-6m 3 / h and 10-15m 3 / h add dilute sulfuric acid and water glass solution, the continuous addition time is 100-135min, then add acidic aluminum sulfate solution to adjust the pH value of the reaction solution to 3-5 to obtain a reaction slurry;

[0016] Wherein the concentration of aluminum sulfate in the acidic aluminum sulfate solution is 14.3-38.0wt%, the SiO of the water glass solution 2 The content of is 15-25wt%;

[0017] The reaction slurry is washed with water, then dried and pulverized to obtain nano silicon dioxide for high elastic silicone rubber.

[...

Embodiment 1

[0031] at 10m 3 Add 2m to the enamel reactor 3 water, add 2m 3 30wt% dilute sulfuric acid, start stirring and then add 572kg solid aluminum sulfate, stir for 30min to prepare acidic aluminum sulfate solution. Select high-quality food-grade solid water glass with a modulus of 3.3, put it into a static autoclave, add treated water, introduce steam through a precision filter, pressurize to 0.6MPa, keep the pressure for 2 hours, add water, and prepare SiO 2 Content is the water glass solution of 22wt%, store for future use.

[0032] at 60m 3 First add 10m 3 The bottom water is heated to 90°C by steaming, adding 500kg of solid sodium sulfate and stirring to dissolve, then adding 3m 3 The water glass solution is stirred evenly to obtain the reaction solution, and the reaction starts, and the flow rate is controlled at 5m 3 / h and 15m 3 Add 18wt% dilute sulfuric acid and the water glass solution per h, the continuous addition time is 120min, the pH value of the control reactio...

Embodiment 2

[0034] at 10m 3 Add 2m to the enamel reactor 3 water, add 1m 3 30wt% dilute sulfuric acid, start stirring and then add 600kg solid aluminum sulfate, stir for 30min to prepare acidic aluminum sulfate solution. Select high-quality food-grade solid water glass with a modulus of 3.5, put it into a static autoclave, add treated water, introduce steam through a precision filter, pressurize to 0.8MPa, keep the pressure for 3 hours, add water, and prepare SiO 2 Content is the water glass solution of 25wt%, store for future use.

[0035] at 60m 3 First add 10m 3 The bottom water is heated to 92°C by steaming, adding 300kg of solid sodium sulfate and stirring to dissolve, then adding 4m3 The water glass solution is stirred evenly to obtain the reaction solution, and the reaction starts, respectively controlling the flow rate of 4m 3 / h and 12m 3 / h adds 22wt% dilute sulfuric acid and the water glass solution, the continuous addition time is 115min, the pH value of the control reac...

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Abstract

The invention relates to the technical field of silicone rubber materials, and particularly relates to a preparation method of low-oil-absorption nano silicon dioxide for high-elastic-property siliconrubber. The method comprises the following steps: heating the bottom water, adding solid sodium sulfate accounting for 1-5wt% of the bottom water, stirring and dissolving; then adding a water glass solution accounting for 30-50% of the volume of the bottom water to obtain a reaction solution, respectively controlling the flow to be 3-6m < 3 > / h and 10-15m < 3 > / h, adding dilute sulfuric acid andthe water glass solution, continuously adding for 100-135 minutes, and then adding an acidic aluminum sulfate solution to adjust the pH value of the reaction solution to be 3-5 to obtain reaction slurry; and adding water into the reaction slurry, washing, drying and crushing. The preparation method comprises the following steps: mixing a water glass solution, sulfuric acid and aluminum sulfate according to a certain ratio, and generating nano aluminum hydroxide gel under a heating condition to be compounded with the silicon dioxide to form a larger secondary structure polymer so that the dispersity of the silicon dioxide in the silicon rubber is improved, the hysteresis quality of a silicon dioxide structure is reduced, and the elasticity of a silicon rubber product is effectively improved.

Description

[0001] This case is a divisional application based on the invention patent with the application date of 2018-05-28, the application number 201810519935.9, and the title of "a method for preparing nano-silica for high elastic silicone rubber". technical field [0002] The invention relates to the technical field of silicone rubber materials, in particular to a method for preparing low oil-absorbing nano-silica for high elastic energy silicone rubber. Background technique [0003] High elasticity is the most valuable characteristic of silicone rubber. The high elasticity of silicone rubber comes from the movement of silicone rubber molecular segments and is formed through conformational changes. Since the interaction between silicone rubber molecules will hinder the movement of molecular segments, part of the force acting on silicone rubber molecules is used to overcome the viscous resistance between molecules, and the other part deforms the molecular chains, which constitute t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/34C01B33/12B82Y40/00B82Y30/00C08K3/22C08K3/36C08L83/04
CPCB82Y40/00C01B33/12C01F7/34C08K3/22C08K3/36C01P2006/12C01P2006/19C01P2004/82C08K2201/011C08K2003/2227B82Y30/00C08L83/04
Inventor 王承辉汤晓剑杨军马秀娟
Owner FUJIAN YUANXIANG CHEM
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