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Modification method of lowering amount of hydroxyl groups on surface of white carbon black for silicone rubber

A technology of silica and hydroxyl number, which is applied in the field of modification to reduce the surface hydroxyl number of silica for silicone rubber. It can solve the problems of affecting the interaction of silicone rubber, large specific surface area, and poor dispersion, so as to reduce the number of hydroxyl groups. Number and specific surface area, strengthen the interaction, improve the effect of tear strength and hardness

Inactive Publication Date: 2018-12-21
ANHUI JINHUA ZINC OXIDE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Silica is widely used in the rubber industry because of its special physical and chemical properties. According to different preparation methods, silica can be divided into gas phase silica and liquid phase silica. Although the two types of silica The complexity of the structure is different, but the surface contains a considerable number of hydroxyl groups. These surface hydroxyl groups are hydrophilic, which makes the silica easy to agglomerate and deteriorates the dispersion in silicone rubber. Surface modification is often used to reduce the hydroxyl groups on the surface of silica. , to improve its hydrophobicity. At the same time, these surface hydroxyl groups also play an active role in the reinforcement of silica to silicone rubber. Because silica particles are small and have a large specific surface area, a large number of interfaces are formed in silicone rubber. The surface hydroxyl groups of silica and the molecular chains of silicone rubber form hydrogen bonds, which enhance the interfacial bonding force between silica and silicone rubber. Therefore, reducing the surface hydroxyl groups of silica can improve the hydrophobicity of silica and make it Evenly dispersed, but it will also affect the interaction with silicone rubber, therefore, further research on how to modify silica is needed

Method used

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  • Modification method of lowering amount of hydroxyl groups on surface of white carbon black for silicone rubber
  • Modification method of lowering amount of hydroxyl groups on surface of white carbon black for silicone rubber

Examples

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Embodiment 1

[0017] A modification method for reducing the number of hydroxyl groups on the surface of white carbon black for silicone rubber, comprising the following steps:

[0018] (1) Immerse white carbon black in a hydrochloric acid solution with a mass concentration of 2.5%, take it out after soaking for 2.5 hours, and mix it with 4% of its weight of phenolic compounds, 2.2% of sodium hexametaphosphate, and 0.4% of bisperoxide 2,4-Dichlorobenzoyl was stirred for 1.5 hours at a temperature of 70° C., filtered with suction after completion, washed until neutral, and dried with hot air to obtain a dried material;

[0019] (2) Mix the dried material with onion essential oil equivalent to 4% of its weight, 15% absolute ethanol, 2% glacial acetic acid, and 1% nitrogen-containing organic base, seal it in a ball mill jar, and ball mill it for 4 hours to obtain a ball mill material;

[0020] (3) Put the ball abrasive into a muffle furnace, raise the temperature to 550° C., and keep it warm f...

Embodiment 2

[0028] A modification method for reducing the number of hydroxyl groups on the surface of white carbon black for silicone rubber, comprising the following steps:

[0029] (1) Immerse white carbon black in a hydrochloric acid solution with a mass concentration of 2%, take it out after soaking for 3 hours, and mix it with 4.5% of its weight of phenolic compounds, 2.6% of sodium hexametaphosphate, and 0.3% of bisperoxide 2, 4-dichlorobenzoyl, stirred at 75°C for 1 hour, suction filtered after completion, washed until neutral, and dried with hot air to obtain a dried material;

[0030] (2) Mix the dry material with onion essential oil equivalent to 6% of its weight, 12% absolute ethanol, 3% glacial acetic acid, and 1.2% nitrogen-containing organic base, seal it in a ball mill jar, and ball mill it for 5 hours to obtain a ball mill material;

[0031] (3) Put the ball abrasive into a muffle furnace, raise the temperature to 500° C., and keep it warm for 40 minutes to obtain white c...

Embodiment 3

[0039] A modification method for reducing the number of hydroxyl groups on the surface of white carbon black for silicone rubber, comprising the following steps:

[0040] (1) Immerse white carbon black in a hydrochloric acid solution with a mass concentration of 3%, take it out after soaking for 2 hours, and mix it with 3.5% of its weight of phenolic compounds, 1.8% of sodium hexametaphosphate, and 0.5% of bisperoxide 2,4-dichlorobenzoyl, stirred at 65°C for 2 hours, suction filtered after completion, washed until neutral, and dried with hot air to obtain a dried material;

[0041] (2) Mix the dry material with onion essential oil equivalent to 2% of its weight, 18% absolute ethanol, 1% glacial acetic acid, and 0.8% nitrogen-containing organic base, seal it in a ball mill jar, and ball mill it for 3 hours to obtain a ball mill material;

[0042] (3) Put the ball abrasive into a muffle furnace, raise the temperature to 600°C, and keep it warm for 30 minutes to obtain white car...

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Abstract

The invention belongs to the technical field of white carbon black modification and particularly relates to a modification method of lowering the amount of hydroxyl groups on the surface of white carbon black for silicone rubber. The modification method comprises the following steps of preparing a dried material, mixing the dried material with onion essential oil, absolute ethyl alcohol, glacial acetic acid and nitrogen-contained organic alkali, performing sealing in a ball milling tank, and performing ball milling for 3-5h to obtain a ball milling material; and putting the ball milling material in a muffle furnace, rising the temperature to 500-600 DEG C, and performing thermal insulation for 30-40min to obtain modified white carbon black for the silicone rubber. Compared with the prior art, the modification method has the advantages that the preparation steps of the modified white carbon black are strictly controlled, the modification uniformity of the white carbon black can be improved, and the amount of the hydroxyl groups on the surface of the white carbon black and the specific surface area are lowered; through synergistic modification of the raw materials including the onionessential oil, the white carbon black can be effectively combined with the silicone rubber, and the vulcanization rate is increased; the white carbon black generates cross-linking reaction with the silicone rubber, so that the mutual action of the white carbon black with the silicone rubber is strengthened, and the tearing strength and hardness of the silicone rubber can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of white carbon black modification, and in particular relates to a modification method for reducing the number of hydroxyl groups on the surface of white carbon black for silicone rubber. Background technique [0002] Silica is widely used in the rubber industry because of its special physical and chemical properties. According to different preparation methods, silica can be divided into gas phase silica and liquid phase silica. Although the two types of silica The complexity of the structure is different, but the surface contains a considerable number of hydroxyl groups. These surface hydroxyl groups are hydrophilic, which makes the silica easy to agglomerate and deteriorates the dispersion in silicone rubber. Surface modification is often used to reduce the hydroxyl groups on the surface of silica. , to improve its hydrophobicity. At the same time, these surface hydroxyl groups also play an active role in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08K9/00C08K9/02C08K9/04C08K3/36
CPCC08K3/36C08K9/00C08K9/02C08K9/04C08L83/04
Inventor 张训龙
Owner ANHUI JINHUA ZINC OXIDE CO LTD
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