Rice-husk-based carbon/silicon composite used as rubber filler and preparation method thereof

A rice husk-based carbon and rubber filler technology, which is applied in the fields of rubber fillers and carbon/silicon composite rubber fillers, can solve the problems of low carbon content and large performance fluctuations, and achieve low resource consumption, low cost, and excellent preparation process simple effect

Inactive Publication Date: 2011-10-12
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the rice husk ash used in these studies is obtained under aerobic combustion conditions, and its carbon content

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] After removing impurities, 100g of rice husk is pretreated in a muffle furnace at 220°C for 1 hour to pre-carbonize the rice husk; then the pre-carbonized rice husk is crushed and placed in a vacuum sintering furnace with a vacuum degree of 0.1-1Pa, and the heating rate is controlled 10°C / min, sintering temperature 500°C, holding time 20min after reaching the sintering temperature, after cooling to room temperature, transfer the product to the reactor, add 10% sodium hydroxide solution, the solid-liquid ratio is 1 / 20, heat to 90 Reflux at ℃ for 1 hour, filter and wash until neutral, and dry the solid to obtain a carbon content of 90% and a specific surface area of ​​120 m 2 / g, DBP absorption value is 2.8cm 3 / g of rice husk-based carbon / silicon composites with low silicon content.

Embodiment 2

[0024] After removing impurities, 100g of rice husk is pretreated in a muffle furnace at 220°C for 1 hour to pre-carbonize the rice husk; then the pre-carbonized rice husk is crushed and placed in a vacuum sintering furnace with a vacuum degree of 0.1-1Pa, and the heating rate is controlled 10°C / min, sintering temperature 600°C, holding time 20min after reaching the sintering temperature, after cooling to room temperature, transfer the product to the reaction kettle, add 10% sodium hydroxide solution, the solid-liquid ratio is 1 / 30, heat to 90 Reflux at ℃ for 1 hour, filter and wash until neutral, and dry the solid to obtain a carbon content of 95% and a specific surface area of ​​137 m 2 / g, DBP absorption value is 2.7cm 3 / g of rice husk-based carbon / silicon composites with low silicon content.

Embodiment 3

[0026] After removing impurities, 100g of rice husk is pretreated in a muffle furnace at 220°C for 1 hour to pre-carbonize the rice husk; then the pre-carbonized rice husk is crushed and placed in a vacuum sintering furnace with a vacuum degree of 0.1-1Pa, and the heating rate is controlled 10°C / min, sintering temperature 500°C, holding time 20min after reaching the sintering temperature, after cooling to room temperature, transfer the product to the reactor, add 10% sodium hydroxide solution, the solid-liquid ratio is 1 / 30, heat to 90 Reflux at ℃ for 2 hours, filter and wash until neutral, and dry the solid to obtain a carbon content of 98% and a specific surface area of ​​160 m 2 / g, DBP absorption value is 2.5cm 3 / g of rice husk-based carbon / silicon composites with low silicon content.

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Abstract

The invention discloses a rice-husk-based carbon/silicon composite used as a rubber filler and a preparation method thereof, and belongs to the technical field of the preparation of carbon/silicon fillers. The method comprises the following steps of: pre-carbonizing a raw material, namely rice husks in a muffle furnace at low temperature so as to remove the moisture and volatile substances from the rice husks, carbonizing in a vacuum sintering furnace, and controlling sintering conditions to obtain a rice-husk-based carbon/silicon composite with high silicon content, wherein the carbon accounts for 65 to 75 percent of the total weight of the carbon/silicon composite, the nitrogen adsorption Brunauer-Emmett-Teller (BET) specific surface area is 12 to 75m<2>/g, and the dibutyl phthalate (DBP) absorption number is 1.7 to 3.8cm<3>/g; and treating the rice-husk-based carbon/silicon composite with high silicon content by using solution of sodium hydroxide or potassium hydroxide, and dissolving out most of silicon dioxide to obtain the rice-husk-based carbon/silicon composite with low silicon content, wherein the carbon accounts for 85 to 98 percent of the total weight of the rice-husk-based carbon/silicon composite, the specific surface area is 120 to 196 m<2>/g, and the DBP absorption number is 2.1 to 3.0cm<3>/g. The rice-husk-based carbon/silicon composite serving as a reinforcingagent and a filler is widely applicable to various models of rubber varieties; moreover, the rice-husk-based carbon/silicon composite is an excellent dual phase filler.

Description

technical field [0001] The invention relates to a rubber filler, in particular to a carbon / silicon composite rubber filler prepared from rice husks, and belongs to the technical field of carbon / silicon filler preparation. Background technique [0002] Filler is one of the main raw materials in the rubber industry, which can endow rubber with many excellent properties. Carbon black is one of the most widely used rubber additives, which mainly plays the role of reinforcement and filling. The main factors affecting the reinforcing and filling effect of carbon black are the specific surface area and the degree of structure. The specific surface area is usually determined by the nitrogen adsorption BET method or the macromolecular surfactant adsorption method, while the oil absorption value method is widely used in the industry to characterize carbon black by the absorption value of dibutyl phthalate (DBP). Generally, the higher the DBP value, the higher the structure of carbon...

Claims

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Application Information

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IPC IPC(8): C08L21/00C08K3/00C08K3/04C08K3/36
Inventor 李晓瑄王园园陈正行陆凤凤王楷媛
Owner JIANGNAN UNIV
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