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Kaolin/rubber nano compound material with strengthening and obstructing dual property

A technology of rubber nano-composite materials, applied in the field of kaolin/rubber nano-composite materials, to achieve the effects of energy saving, easy popularization and application, and good processing performance

Inactive Publication Date: 2009-03-11
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, conventional kaolin generally does not have both reinforcing and barrier properties

Method used

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  • Kaolin/rubber nano compound material with strengthening and obstructing dual property
  • Kaolin/rubber nano compound material with strengthening and obstructing dual property
  • Kaolin/rubber nano compound material with strengthening and obstructing dual property

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Using 3% of the total amount of vinyl trimethoxysilane coupling agent and 2% of isopropyl triisostearyl titanate coupling agent to modify the mixture of nano kaolin accounting for 95% of the total amount to prepare organic modified Sexual nano-kaolin.

[0044] 50 parts of nano-kaolin, 1500 parts of styrene-butadiene rubber, 3 parts of zinc oxide, 1 part of stearic acid, 1 part of accelerator NS, 1.75 parts of sulfur, and 1.75 parts of organically modified nano-kaolin obtained by blending, in order to make the powder in To achieve uniform dispersion in the rubber matrix, the rubber is firstly mixed in an open mill (φ160mm×320mm, Shanghai Rubber Machinery Factory). The mixing process is: raw rubber → small materials (accelerators, active agents) → silane-modified Nano-kaolin→softener→sulfur→thin pass several times and then evenly slice down. The mixing time is 12~15min. The positive vulcanization point is measured with a vulcanization meter, the vulcanization condition i...

Embodiment 2

[0054] Using 4% isopropyl trimethacryloyl titanate coupling agent to modify the nano-kaolin which accounts for 96% of the total amount to prepare titanate-modified nano-kaolin.

[0055] Blend 45 parts of the obtained titanate-modified nano kaolin, 100 parts of natural rubber, 5 parts of zinc oxide, 4 parts of stearic acid, 1 part of accelerator M, 3 parts of sulfur, and 1.5 parts of antioxidant D. The mixing process and the sequence of feeding are the same as in Example 1. After testing, the mechanical properties of natural rubber / kaolin nanocomposites are as follows:

[0056] Elongation at break, 670%;

[0057] Tensile strength, 24.7Mpa;

[0058] 300% constant stretch, 4.68Mpa;

[0059] 500% constant stretch, 12.6Mpa;

[0060] Air permeability 53.80×10 -18 m 2 / Pa.s.

[0061] Compared with Comparative Example 2, the modulus of elongation is improved, and the air permeability is reduced by 35.0%.

[0062] Figure 4 The transmission electron micrograph of the ion slice...

Embodiment 3

[0064] 3% of the total amount of stearic acid is used to modify the mixed nano-kaolin which accounts for 97% of the total amount to prepare organic carboxylic acid-modified nano-kaolin.

[0065] 60 parts of the obtained organic carboxylic acid modified nano kaolin, 100 parts of butyl rubber, 3 parts of zinc oxide, 1 part of stearic acid, 1 part of accelerator TMTD and 1.75 parts of sulfur are blended. The mixing process and the sequence of feeding are the same as in Example 1. After testing, the mechanical properties of butyl rubber / kaolin nanocomposites are as follows:

[0066] Elongation at break, 750%;

[0067] Tensile strength, 13.7Mpa;

[0068] 300% constant stretch, 1.78Mpa;

[0069] 500% constant stretch, 3.6Mpa;

[0070] Tear strength, 21kN / m;

[0071] Air permeability 1.19×10 -18 m 2 / Pa.s.

[0072] Compared with Comparative Example 3, various mechanical properties are significantly improved, and the air permeability is reduced by 82.6%.

[0073] Figure 5 T...

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Abstract

The invention relates to preparation of kaolin / rubber nano composite materials which simultaneously have strengthened property and gas barrier property by mixing nano kaolin powdery body and rubber and adding various matching accessory ingredients in the prior art of rubber production without changing manufacturing equipment. The diameter of a sheet layer of the nano kaolin is between 100 and 800 nanometers, and the thickness of the sheet layer is between 10 and 100 nanometers; the nano kaolin is kaolin with out-of-order crystallization; and the nano kaolin powdery body is processed by an organic modifier and granulated. The composite materials have good tensile strength, stretching strength, elasticity and elongation; and the air permeability of the composite materials is reduced by 30 to 80 percent compared with pure rubber.

Description

technical field [0001] The invention relates to adding nano-level kaolin into a rubber matrix to prepare a kaolin / rubber nanocomposite material. technical background [0002] Commonly used reinforcing agents for rubber are carbon black and white carbon black. So far, there is no filler in the industry that can exceed their reinforcing effect. However, there are still some problems in the application of these two reinforcing agents, for example, due to the fine particles of the two, it is difficult to disperse in rubber, and the gas barrier performance is not very ideal. Especially carbon black, its production raw material comes from oil, in today and in the future when oil is depleted day by day and oil price is skyrocketing, it has become inevitable to find alternative or partial substitute reinforcing agents. [0003] Air pressure and air tightness are the life of tires, and famous tire manufacturers in developed countries in the world are trying their best to improve the...

Claims

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Application Information

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IPC IPC(8): C08L21/00C08K3/34C08K9/04
Inventor 刘钦甫张玉德
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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