Epoxidized natural rubber coated modified white carbon black and preparation method thereof and rubber material

A technology of natural rubber and rubber materials, applied in the field of surface modification of silica, can solve the problems of low tensile stress, low reactivity, large permanent deformation, etc., and achieves improved tensile strength, simple preparation method, and permanent deformation rate reduced effect

Active Publication Date: 2016-02-17
AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the study also found that due to the low reactivity of epoxy groups and silanol groups, hydrogen bonding is mainly formed between epoxidized natural rubber and silica, and it is

Method used

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  • Epoxidized natural rubber coated modified white carbon black and preparation method thereof and rubber material
  • Epoxidized natural rubber coated modified white carbon black and preparation method thereof and rubber material
  • Epoxidized natural rubber coated modified white carbon black and preparation method thereof and rubber material

Examples

Experimental program
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Example Embodiment

[0022] The invention provides a preparation method of epoxidized natural rubber coated modified silica, which comprises the following steps:

[0023] (1) Provide a dispersion of white carbon black, and mix the dispersion with epoxidized natural rubber to obtain a mixture;

[0024] (2) Perform shearing treatment on the mixed material obtained in the step (1) to obtain a mixed slurry;

[0025] (3) Perform solid-liquid separation of the mixed slurry in step (2) to obtain a silica precursor coated with epoxidized natural rubber;

[0026] (4) The white carbon black precursor obtained in step (3) is heat-treated to obtain an epoxidized natural rubber coated modified white carbon black.

[0027] The present invention first provides a dispersion of white carbon black. The present invention does not have special restrictions on the operation of preparing the dispersion liquid, and the technical solution for preparing dispersion liquid well known to those skilled in the art may be adopted. In t...

Example Embodiment

[0041] Example 1:

[0042] Disperse 100g of white carbon black powder in 400g of water. After ultrasonically crushing and dispersing uniformly, add 50g of epoxidized natural rubber emulsion with a dry rubber content of 20wt% and an epoxidation degree of 40%. Mix in a machine and process for 0.5h at 10000rpm; the obtained mixed slurry is separated by sedimentation in a centrifuge with a speed of 8000rpm, dried at 70℃ for 12h, crushed by a crusher, and treated at 180℃ under vacuum for 2h, Obtain epoxidized natural rubber coated modified silica; perform moisture absorption treatment at an air humidity of 80%, so that the moisture content of the silica reaches 6%; mix with natural rubber and vulcanize according to the formula listed in Table 1 rubber.

[0043] The epoxidized natural rubber coated modified silica obtained in this example was subjected to X-ray photoelectron spectroscopy characterization test, and the result is shown in FIG. 2. It can be seen from Figure 2 that after t...

Example Embodiment

[0044] Example 2:

[0045] Directly take 500g of white carbon black slurry with a dry matter content of 20wt%, and after high-speed shearing, add 5g of N-(β-aminoethyl-γ-aminopropyl)methyldimethoxysilane under mechanical stirring to react After 1h, add 60g of epoxidized natural rubber emulsion with dry rubber content of 25wt% and epoxidation degree of 25%, and treat it for 2 times under 200Mpa working pressure in a high-pressure homogeneous dispersing machine; spray the obtained mixed slurry Drying, the inlet temperature of the spray drying device is 200°C, and the outlet temperature is 100°C; the obtained silica precursor is treated at 150°C for 5 hours under the protection of nitrogen to obtain epoxidized natural rubber coated modified silica; Hygroscopic treatment is carried out at an air humidity of 80% to make the water content of the white carbon black reach 6%; according to the formula listed in Table 1, it is mixed with natural rubber and vulcanized to obtain rubber.

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Abstract

The invention provides epoxidized natural rubber coated modified white carbon black and a preparation method. Compared with a rubber material filled with white carbon black, the rubber material filled with the epoxidized natural rubber coated modified white carbon black can be improved in 300% stretching strength by 80%, the abrasion loss can be reduced by 36%, and the permanent deformation rate can be reduced by 58%. Dispersing liquid of the white carbon black and epoxidized natural rubber are mixed and undergo shearing treatment, solid-liquid separation and high-temperature treatment, so that epoxy groups and silicone hydroxyl undergo chemical bonding, and the epoxidized natural rubber coated modified white carbon black is obtained. The preparation method is simple, convenient and practical and has easiness in industrialization and can be combined with an existing white carbon black production process.

Description

technical field [0001] The invention relates to the technical field of surface modification of white carbon black, in particular to an epoxidized natural rubber-coated modified white carbon black, a preparation method thereof, and rubber prepared therefrom. Background technique [0002] Silica is an excellent rubber reinforcing agent. Currently, more than 70% of the world's silica is used in the rubber industry. Compared with carbon black, silica can improve the tear resistance and adhesion properties of rubber, reduce the rolling resistance of tire tread compounds and improve wet traction. However, silica has a large specific surface area and tends to secondary aggregation. In addition, the surface contains a large number of hydroxyl groups, which are prone to strong hydrogen bond associations, resulting in the aggregation of silica aggregates into larger aggregates. It is difficult to disperse evenly in the medium, which makes the processing performance and use performanc...

Claims

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Application Information

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IPC IPC(8): C08K9/10C08K3/36
CPCC08K3/36C08K9/10
Inventor 廖禄生李一民钟杰平张福全王兵兵汪月琼胡彦师许逵彭政
Owner AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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