Preparation method of aging resistant modified natural rubber

A natural rubber, aging-resistant technology, applied in the field of preparation of aging-resistant modified natural rubber, can solve the problems of weak interaction, high production cost, small output, etc., to improve interface adhesion, improve mechanical properties, increase The effect of thermal stability

Inactive Publication Date: 2017-09-22
ANHUI JINHUA ZINC OXIDE CO LTD
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  • Abstract
  • Description
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Problems solved by technology

[0002] Silica is widely used in the rubber industry due to its small particle size, large specific surface, high hardness, good heat resistance and excellent reinforcing properties. According to different methods, silica can be divided into two types: gas phase method and precipitation method. Large class of silica, fumed silica is usually nano-scale silica, which is prepared by dry method, the preparation process is complicated, the output is not large, easy to agglomerate, and the price is high. In order to improve the dispersion performance of nano-silica in polymers , often modified according to the surface characteristics of the filler, such as using a siloxane coupling agent to modify it in situ, which can improve the dispersion of nano-silica in the polymer matrix. It helps to enhance the mechanical properties of composite materials. Although gas-phase nano-stall and your addition can improve some properties of the polymer, due to the high production cost of gas-phase silica, large-scale applications are limited. Precipitated silica, namely Hydrated precipitated silica, usually micro-nano scale, simple production process, low price, mainly used as reinforcing filler in rubber shoe materials and some tire products, in the prior art, fatty alcohol, amine, fatty acid and siloxane are used As a modifier to modify precipitated silica, but when the modified silica is used as a filler, it will affect the mechanical properties of the composite, the vulcanization characteristics and processing performance of the filled rubber are not good, and the physical properties of the vulcanized rubber This is due to the weak polymer-filler interaction and strong filler interaction. With the gradual improvement of materials, higher requirements are placed on the aging resistance of rubber properties. Therefore, it is necessary to This further study

Method used

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Examples

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Effect test

Embodiment 1

[0014] A preparation method of anti-aging modified natural rubber, comprising the following steps:

[0015] (1) Silica modification: Dry the silica at 220°C for 6 hours, then mix it with abietic acid type resin acid equivalent to 5% of its weight, and 15% chlorohydrin rubber at a temperature of 150°C. masticate for 23 minutes under the condition of ℃, extract continuously with tetrahydrofuran for 24 hours after discharge, and dry at 130 ℃ after the solvent evaporates to obtain modified white carbon black;

[0016] (2) Preparation of masterbatch: mix natural rubber, modified white carbon black, and multi-walled carbon nanotubes at a weight ratio of 10:1.5:0.6, mix the rubber materials in a double-roller mill, and mix to produce sheets. Put the obtained mixed rubber on an extruder to granulate.

[0017] Among them, the white carbon black is prepared and provided by our company. The specific surface area of ​​the white carbon black is 170-180㎡ / g, which can effectively control th...

Embodiment 2

[0023] A preparation method of anti-aging modified natural rubber, comprising the following steps:

[0024] (1) Silica modification: Dry the silica at 200°C for 8 hours, then mix it with abietic acid type resin acid equivalent to 4% of its weight and 18% chlorohydrin rubber at a temperature of 140°C. masticate for 25 minutes under the condition of ℃, continuously extract with tetrahydrofuran for 24 hours after discharge, and dry at 120 ℃ after the solvent evaporates to obtain modified white carbon black;

[0025] (2) Preparation of masterbatch: mix natural rubber, modified white carbon black, and multi-walled carbon nanotubes at a weight ratio of 10:1.6:0.6, mix the rubber materials in a double-roller mill, and mix to produce sheets. Put the obtained mixed rubber on an extruder to granulate.

[0026] The rest of the content is the same as in Example 1.

Embodiment 3

[0028] A preparation method of anti-aging modified natural rubber, comprising the following steps:

[0029] (1) Silica modification: Dry the silica at 240°C for 4 hours, then mix it with abietic acid type resin acid equivalent to 7% of its weight, and 12% chlorohydrin rubber at a temperature of 160°C. masticate for 20 minutes under the condition of ℃, extract continuously with tetrahydrofuran for 24 hours after discharge, and dry at 150 ℃ after the solvent evaporates to obtain modified white carbon black;

[0030] (2) Preparation of masterbatch: mix natural rubber, modified white carbon black, and multi-walled carbon nanotubes at a weight ratio of 10:1.3:0.7, mix the rubber materials in a double-roll mill, and knead to produce sheets. Put the obtained mixed rubber on an extruder to granulate.

[0031] The rest of the content is the same as in Example 1.

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Abstract

The invention belongs to the technical field of white carbon black modified natural rubber, and more specifically relates to a preparation method of an aging resistant modified natural rubber. The preparation method comprises steps of white carbon black modification and rubber master batch preparation. Compared with the prior art, the preparation method possesses following advantages: pre-drying process of white carbon black is capable of influencing water content and properties of white carbon black, and then influencing reaction degree of molecular chains with groups in modification process, and influencing product heat stability; modification of white carbon black is capable of increasing interface adhesive force, and increasing the dispersibility of white carbon black, chemical bonds are formed via chemical reaction of a part of hydroxy groups on the surface of white carbon black, and crosslinking and winding of long chain groups with natural rubber are capable of improving the heat stability of modified natural rubber; modified white carbon black is capable of inhibiting sliding of natural rubber chain segments in a finished compound product, reducing cross section deformation, and improving mechanical properties of the compound.

Description

technical field [0001] The invention belongs to the technical field of white carbon black modified natural rubber, and in particular relates to a preparation method of aging-resistant modified natural rubber. Background technique [0002] Silica is widely used in the rubber industry due to its small particle size, large specific surface, high hardness, good heat resistance and excellent reinforcing properties. According to different methods, silica can be divided into two types: gas phase method and precipitation method. Large class of silica, fumed silica is usually nano-scale silica, which is prepared by dry method, the preparation process is complicated, the output is not large, easy to agglomerate, and the price is high. In order to improve the dispersion performance of nano-silica in polymers , often modified according to the surface characteristics of the filler, such as using a siloxane coupling agent to modify it in situ, which can improve the dispersion of nano-sili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L7/00C08K13/06C08K7/00C08K9/04C08K3/36C08K7/24
CPCC08K13/06C08K3/36C08K7/24C08K9/04C08K9/08C08K2201/006C08K2201/011C08L7/00C08K7/00
Inventor 张训龙
Owner ANHUI JINHUA ZINC OXIDE CO LTD
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