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Large rubber particle natural latex and preparation method thereof, carbon black filled natural rubber and preparation method and application thereof

A technology of natural rubber latex and rubber particles, which is applied in the fields of large rubber latex and its preparation, carbon black filled natural rubber and its preparation, and can solve the problems of internal temperature rise, service life of rubber products, and carbon black filled natural rubber. Obvious issues

Active Publication Date: 2022-03-22
AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When natural rubber is used in dynamic conditions, the internal temperature will rise, resulting in a decrease in the service life of rubber products
At present, the industry mainly reduces the content of free protein in natural rubber through microbial or protease digestion to reduce the dynamic heat generation of natural rubber. However, this method can only significantly reduce the dynamic heat generation of non-filled natural rubber. The role of natural rubber is not obvious

Method used

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  • Large rubber particle natural latex and preparation method thereof, carbon black filled natural rubber and preparation method and application thereof

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preparation example Construction

[0022] The invention provides a kind of preparation method of large rubber particle natural latex, comprises the following steps:

[0023] The natural latex dilution is centrifuged, and the upper latex layer obtained is natural latex with large rubber particles; the centrifugal separation factor during the centrifugation is ≥8340.

[0024] In the present invention, the natural latex dilution is obtained by diluting collected fresh natural latex with a solvent.

[0025] The present invention has no special requirements on the source of the fresh natural rubber latex.

[0026] In the present invention, the natural latex diluent preferably includes natural rubber and a solvent, and the mass percentage of the natural latex diluent is preferably 20-30%.

[0027] In the present invention, the solvent is preferably water.

[0028] In the present invention, the mass percentage of the natural latex diluent is preferably 20 to 30%, and in a specific embodiment of the present invention...

Embodiment 1

[0075] Get freshly collected natural latex 5kg, add water to dilute, add 25% ammoniacal liquor 0.04kg, obtain natural latex dilution, natural rubber content is 20%, adopt high-speed refrigerated centrifuge centrifugal, natural latex dilution temperature is 4 ℃ during centrifugal, The separation factor is set to 8340, the centrifugation time is 30min, and the upper layer of latex layer and the lower layer of latex layer are obtained by centrifugation, and the latex layer is taken to obtain the natural latex of large rubber particles;

[0076] The large rubber particle natural rubber latex is diluted with water to 30% of the natural rubber percentage. Take 3kg of natural rubber latex, add 1kg of 2wt% formic acid to coagulate it, and after aging for 16 hours, the curd is creped three times, and the granules are torn off, and the granules are dried at 110°C to obtain natural rubber raw rubber. Using the carbon black standard test formula, referring to the mixing and vulcanization ...

Embodiment 2

[0079] Get freshly collected natural latex 5kg, add water to dilute, add 25% ammoniacal liquor 0.04kg, obtain natural latex dilution, natural rubber content is 25%, adopt high-speed refrigerated centrifuge centrifugal, natural latex dilution temperature is 4 ℃ during centrifugal, The separation factor is set to 10600, the centrifugation time is 40min, and the upper latex layer and the lower latex layer are obtained by centrifugation, and the latex layer is taken to obtain the natural latex of large rubber particles;

[0080] The large rubber particle natural rubber latex is diluted with water to 30% of the natural rubber percentage. Take 3kg of natural rubber latex, add 600g of Lactobacillus bacteria liquid to coagulate, and after the curd is matured for 16 hours, it is creped three times, and the particles are torn off, and the rubber particles are dried at 110°C to obtain natural rubber raw rubber. Using the carbon black standard test formula, referring to the mixing and vul...

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Abstract

The invention relates to the technical field of carbon black filled natural rubber, in particular to a preparation method of large rubber particle natural latex, carbon black filled natural rubber and a preparation method and application thereof. The preparation method of the large rubber particle natural latex provided by the invention comprises the following steps: centrifuging a natural latex diluent to obtain upper latex which is the large rubber particle natural latex; and the centrifugal separation factor during centrifugation is greater than or equal to 8340. The preparation method provided by the invention can effectively realize separation of small rubber particles in natural latex, and the volume percentage content of the small rubber particles in the obtained large rubber particle natural latex is less than or equal to 5%. The large rubber particle natural latex is used as a raw material to prepare the carbon black filled natural rubber, and the dynamic heat generation of the obtained carbon black filled natural rubber is obviously reduced.

Description

technical field [0001] The invention relates to the technical field of carbon black-filled natural rubber, in particular to a large rubber particle natural latex and a preparation method thereof, a carbon black-filled natural rubber, a preparation method and application thereof. Background technique [0002] Natural rubber has excellent comprehensive mechanical properties and is widely used in rubber products such as automobile tires, aircraft tires, and high-speed train vibration dampers. The particle size of rubber particles in natural rubber latex has the characteristics of wide distribution, and the particle size range is 20-2000nm. Usually, the particle size of the rubber particles measured by a dynamic light scattering nanometer shows an obvious bimodal distribution. Based on the bimodal distribution property of the rubber particle size, the rubber particles belonging to the small particle size peak are defined as small rubber particles, and the rubber particles belon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08C1/10C08C1/15C08L7/00C08K3/04
CPCC08C1/10C08C1/15C08K3/04C08L7/00Y02T10/86
Inventor 廖禄生何思敏张福全许逵钟杰平彭文凤
Owner AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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