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Method for preparing pretreated white carbon black/natural rubber composite material

A technology of natural rubber and composite materials, which is applied in the preparation of high-performance and high-dispersion silica/natural rubber nanocomposite materials and the preparation of natural rubber liquid slurry, and can solve the problems of early curing of natural latex

Active Publication Date: 2014-03-12
BEIJING UNIV OF CHEM TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a kind of preparation method of the natural rubber liquid slurry that adds white carbon black and solve the problem that natural latex is easy to solidify early in the experimental process

Method used

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  • Method for preparing pretreated white carbon black/natural rubber composite material

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preparation example Construction

[0018] 1. Preparation of silica-water suspension

[0019] White carbon black water slurry is prepared by mixing white carbon black and water according to the mass percentage of 5:95-20:80 under the action of ordinary stirring.

[0020] 2. Surface treatment of silica

[0021] Put the silica-water suspension in a water bath at 70-80°C, gradually add one of KH550, KH570 or KH590 to the suspension, and the amount of silane coupling agent is 5% of the mass of silica ~10%. The functional groups loaded on the surface of the treated silica are beneficial to enhance the interfacial interaction between the silica and the rubber matrix, thereby improving the mechanical properties of the composite.

[0022] 3. Adjust the pH value of the silica-water suspension

[0023] Because the pH value is a main indicator of the stability of natural rubber latex, it is necessary to add ammonia water to the suspension of silica to increase its pH to above 9.

[0024] 4. Improve the stability of nat...

Embodiment 1

[0030] Stir and mix the white carbon black and water at a mass ratio of 1:9 to obtain a stable white carbon black-water suspension, and the dispersion state of the white carbon black in water is good. Take 700g of silica-water suspension, KH5507g (that is, equivalent to 10% of the mass of silica), and organically modify the silica-water suspension by adding KH550 dropwise in a water bath environment at 80°C. Sex time is 3h. After the silica-water suspension is cooled, ammonia water is added to the suspension to make the pH of the suspension reach 9. Getting solid content is 60% concentrated natural latex 167g, and this latex is diluted with water to solid content and is 20%. And add 0.35 g of sodium lauryl sulfonate to the diluted natural rubber latex. Then this suspension is added to the diluted natural latex, fully stirred to make it evenly mixed, and the natural rubber liquid slurry with a silica content of 70phr is obtained, and then the prepared concentration of 2% CaCl...

Embodiment 2

[0032] Stir and mix the white carbon black and water at a mass ratio of 1:9 to obtain a stable white carbon black-water suspension, and the dispersion state of the white carbon black in water is good. Take 700g of silica-water suspension, 3.5g of KH570 (that is, equivalent to 5% of the mass of silica), and organically modify the silica-water suspension by adding KH570 dropwise in a water bath environment at 80°C. The water bath modification time is 3h. Aqueous ammonia was added to the suspension to bring the pH of the suspension to 9. Getting solid content is 60% concentrated natural latex 167g, and this latex is diluted with water to solid content and is 20%. Then this suspension is added in the diluted natural rubber latex, fully stirred to make it evenly mixed, the obtained white carbon black content is the natural rubber liquid slurry of 70phr, then adding the prepared concentration to this mixed slurry is 2%CaCl 2 The flocculant is flocculated to obtain a silica / natural...

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Abstract

The invention relates to a method for preparing a pretreated white carbon black / natural rubber composite material, relates to the technical field of property improvement on natural rubber composite materials, and is used for solving the problem that natural latex is easy to be cured at an early stage in an experiment process. Firstly, the white carbon black is treated by using a coupling agent to organize the surface of the white carbon black, so that the mutual action between the white carbon black and the rubber is improved; secondly, a white carbon black / rubber nano composite material is obtained through flocculation, washing and drying processes. The method comprises the following steps: firstly, normally stirring and premixing the white carbon black with water, subsequently dropping the coupling agent to modify, further mixing with the natural latex, and finally flocculating, washing and drying so as to obtain the white carbon black / rubber nano composite material. As the white carbon black is uniformly dispersed in natural rubber liquid slurry added with the white carbon black, the white carbon black / rubber nano composite material can be directly used for machining and preparing rubber products such as vulcanized natural rubber which is modified by the white carbon black.

Description

Technical field: [0001] The invention provides a method for preparing a high-performance and high-dispersion white carbon black / natural rubber nanocomposite material; the invention relates to the technical field of performance improvement of natural rubber composite materials, in particular to a natural rubber added with white carbon black Method for preparing liquid slurry and products thereof. Background technique: [0002] Silica, as the best white enhancer, was originally widely used in white and colored rubber products. During the two oil crises in the 1970s, due to the sharp increase in the price of carbon black made from petroleum, people began to study silica Whether it can replace carbon black in tires. In recent years, with the emergence and promotion of "green tires", more and more people pay attention to silica reinforced rubber, and the amount of silica has an obvious growth trend. Reasons for this include better fuel economy and longer tread life for silica-f...

Claims

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Application Information

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IPC IPC(8): C08L7/00C08K9/06C08K3/36C08C1/16
Inventor 张立群韩冬礼吴友平奚梅梅王益庆吴晓辉刘力
Owner BEIJING UNIV OF CHEM TECH
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