A kind of natural rubber/white carbon black composite material and its preparation method and application

A technology of natural rubber and composite materials, applied in the field of rubber, which can solve the problems of long production cycle of composite materials, waste of manpower and material resources, poor aging resistance and anti-vulcanization reversion of rubber materials, etc.

Active Publication Date: 2022-04-26
万向新元科技股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the flocculants used in the flocculation treatment of traditional rubber mixing plants are mostly acid flocculants such as formic acid and acetic acid, and the rubber obtained by flocculation treatment has poor aging resistance and vulcanization reversion resistance.
Moreover, acid flocculation also has problems such as long coagulation time and the acid remaining in the rubber compound is not easy to clean, which leads to a long production cycle of composite materials and wastes manpower and material resources.

Method used

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  • A kind of natural rubber/white carbon black composite material and its preparation method and application
  • A kind of natural rubber/white carbon black composite material and its preparation method and application
  • A kind of natural rubber/white carbon black composite material and its preparation method and application

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preparation example Construction

[0030] The present invention also provides a method for preparing the natural rubber / silica composite material described in the above technical solution, comprising the following steps:

[0031] a) mixing natural rubber latex, white carbon black and a flocculant to obtain a floc gel; the flocculant used for the flocculation includes calcium chloride and organosilicon quaternary ammonium salt;

[0032] b) Dehydrating and drying the flocculated gel to obtain a natural rubber / silica composite material.

[0033] In the preparation method provided by the invention, firstly, natural latex, white carbon black and flocculant are mixed. Wherein, the flocculant includes calcium chloride and organosilicon quaternary ammonium salt, and the specific types of the organosilicon quaternary ammonium salt have been introduced above, and will not be repeated here. In the present invention, based on the dry weight of the natural rubber latex as 100 phr, the amount of the silica is preferably ≤10...

Embodiment 1

[0046] 1) Preparation of natural rubber / silica composite material

[0047] S1 prepares calcium chloride solution:

[0048] A calcium chloride aqueous solution with a concentration of 0.5wt% was prepared for subsequent use; the amount of calcium chloride used in the subsequent flocculation process was 2.7 phr based on the dry weight of the natural latex in the subsequent flocculation process as 100 phr.

[0049] Preparation of S2 natural rubber latex and silica premixed solution:

[0050] Get centrifugal concentrated natural latex, mix and dilute to natural latex solid content with white carbon black and be 18wt%, white carbon black fraction is 20phr (based on the dry weight of natural latex being 100phr), and add 0.2phr dimethyl octadecadecane Alkyl[3-(trimethoxysilyl)propyl]ammonium chloride, mechanical stirring (200rpm), ultrasonic (6000W) dispersion for 5 minutes, set aside.

[0051] S3 flocculation:

[0052] Under normal temperature and pressure, use a flow pump to cont...

Embodiment 2

[0061] 1) Preparation of natural rubber / silica composite material

[0062] S1 prepares calcium chloride solution:

[0063] A calcium chloride aqueous solution with a concentration of 0.7wt% was prepared for subsequent use; the amount of calcium chloride used in the subsequent flocculation process was 3.5 phr based on the dry weight of the natural rubber latex in the subsequent flocculation process as 100 phr.

[0064] Preparation of S2 natural rubber latex and silica premixed solution:

[0065] Get the fresh latex in the field, mix and dilute to latex solid content with white carbon black and be 22wt%, white carbon black fraction is 40phr (the dry weight of natural rubber latex is 100phr), and add the dimethyl octadecyl of 0.3phr [3-(trimethoxysilyl)propyl]ammonium chloride, mechanical stirring (200rpm), ultrasonic wave (1500W) disperse for 15 minutes, set aside.

[0066]S3 flocculation:

[0067] Under normal temperature and pressure, use a flow pump to continuously convect...

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Abstract

The invention belongs to the field of rubber, and in particular relates to a natural rubber / white carbon black composite material and a preparation method and application thereof. The composite material provided by the invention is made of a mixture containing natural rubber latex and white carbon black after flocculation, dehydration and drying; the flocculants used in the flocculation include calcium chloride and organosilicon quaternary ammonium salt. The present invention uses a compound flocculant including calcium chloride and organic silicon quaternary ammonium salt to carry out flocculation treatment on the mixture of natural latex and white carbon black, which can make the natural latex flocculate instantly, thereby greatly shortening the cycle of natural latex flocculation and coagulation, and improving production The degree of continuity; at the same time, it can avoid the obvious sedimentation of white carbon black in the process of natural latex flocculation, and ensure the physical properties of the coagulated rubber. In addition, the use of compound flocculants can also significantly improve the physical properties of the coagulated rubber compound, especially the improvement of aging resistance and vulcanization reversion resistance.

Description

technical field [0001] The invention belongs to the field of rubber, and in particular relates to a natural rubber / white carbon black composite material and a preparation method and application thereof. Background technique [0002] At present, my country is in the process of accelerating industrialization. Traditional production methods have many problems such as excessive energy consumption and increased environmental pollution. It is imminent to change the development mode and innovate the development path. For the rubber industry, the transmission mixing process needs to be improved and upgraded urgently. Wet mixing has become a new research trend in the field of rubber processing at home and abroad due to its advantages of low environmental pollution, low energy consumption and good dispersion of fillers. [0003] The wet mixing of rubber is the process of mixing fillers such as white carbon black in natural latex, flocculation, dehydration, and drying to prepare compo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L7/00C08K3/36C08C1/15
CPCC08K3/36C08L7/00C08C1/15C08L2201/08
Inventor 朱业胜朱光苗李延珍
Owner 万向新元科技股份有限公司
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