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A kind of epoxidized natural rubber coated modified white carbon black and its preparation method and rubber material

A technology of natural rubber and rubber materials, applied in the field of silica surface modification, can solve the problems of strong chemical action, low reactivity, low modulus stress, etc., achieve simple preparation method, improve dispersion and interfacial bonding strength, The effect of improving the tensile strength

Active Publication Date: 2018-08-07
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 difficult to form strong chemical interactions, resulting in silica / rubber composites There are problems such as low modulus stress, large permanent deformation and poor wear resistance

Method used

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  • A kind of epoxidized natural rubber coated modified white carbon black and its preparation method and rubber material
  • A kind of epoxidized natural rubber coated modified white carbon black and its preparation method and rubber material
  • A kind of epoxidized natural rubber coated modified white carbon black and its preparation method and rubber material

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preparation example Construction

[0022] The invention provides a kind of preparation method of epoxidized natural rubber coated modified white carbon black, comprising the following steps:

[0023] (1) provide the dispersion liquid of white carbon black, described dispersion liquid is mixed with epoxidized natural rubber, obtains mixed material;

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

[0025] (3) performing solid-liquid separation on the mixed slurry described in step (2), to obtain a white carbon black precursor coated with epoxidized natural rubber;

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

[0027] The present invention firstly provides a dispersion liquid of white carbon black. In the present invention, there is no special limitation on the operation of preparing the dispersion, and the technical solutions for preparing the dispersion well kn...

Embodiment 1

[0042] Disperse 100g of white carbon black powder in 400g of water, after ultrasonic crushing and uniform dispersion, add 50g of epoxidized natural rubber emulsion with dry rubber content of 20wt% and epoxidation degree of 40%, and disperse homogeneously under high shear Mix in the machine and process at 10000rpm for 0.5h; settle and separate the obtained mixed slurry in a centrifuge at 8000rpm, dry at 70°C for 12h, pulverize with a pulverizer, and treat at 180°C for 2h under vacuum. Obtain epoxidized natural rubber-coated modified white carbon black; carry out moisture absorption treatment under 80% air humidity, make the water content of white carbon black reach 6%; According to the formula listed in Table 1, mix with natural rubber and vulcanize to obtain rubber.

[0043] The epoxidized natural rubber-coated modified silica obtained in this example was subjected to X-ray photoelectron spectroscopy characterization test, and the results are shown in FIG. 2 . It can be seen ...

Embodiment 2

[0045] Directly take 500g dry matter content and be 20wt% white carbon black slurry, after high-speed shearing and crushing, add 5g N-(β-aminoethyl-γ-aminopropyl) methyldimethoxysilane under mechanical stirring, After reacting for 1h, add 60g of epoxidized natural rubber emulsion with dry rubber content of 25wt% and epoxidation degree of 25%, and process it twice under 200Mpa working pressure in a high-pressure homogeneous disperser; Spray 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 under nitrogen protection at 150°C for 5 hours to obtain epoxidized natural rubber-coated modified silica; Hygroscopic treatment was carried out at an air humidity of 80%, so that the moisture content of the silica reached 6%; the formula listed in Table 1 was 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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Patent Type & Authority Patents(China)
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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