Rubber composite material of waste cotton material-based nano-microcrystalline cellulose and preparation method of rubber composite material

A nano-crystal and composite material technology, applied in the rubber field, can solve the problems of high energy consumption for mixing, long processing time, single color tone, etc., and achieves the effects of low cost, reduced reaction time, and simplified reaction steps.

Inactive Publication Date: 2015-04-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, carbon black has some disadvantages, such as heavy pollution in the production and processing of carbon black, long processing time, high energy consumption for mixing, dependence on petroleum resources and single color tone of rubber products reinforced by carbon black

Method used

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  • Rubber composite material of waste cotton material-based nano-microcrystalline cellulose and preparation method of rubber composite material
  • Rubber composite material of waste cotton material-based nano-microcrystalline cellulose and preparation method of rubber composite material
  • Rubber composite material of waste cotton material-based nano-microcrystalline cellulose and preparation method of rubber composite material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Waste cotton as a raw material was hydrolyzed by sulfuric acid with a mass fraction of 25% at 60°C for 180 minutes. The ratio of sulfuric acid to waste cotton is 16 (ml): 1 (g). After the reaction, centrifuge twice, neutralize, then centrifuge once, and ultrasonic for 10 minutes to obtain nanocrystalline cellulose with a diameter of 200-800nm. The length is 1 μm. Such as figure 1 and figure 2 shown.

Embodiment 2

[0057] Waste cotton as a raw material was hydrolyzed by sulfuric acid with a mass fraction of 55% at 65° C. for 40 minutes. The ratio of sulfuric acid to waste cotton is 7 (ml): 1 (g). After the reaction, centrifuge twice, neutralize, centrifuge once more, and ultrasonicate for 10 minutes to obtain nanocrystalline cellulose with a diameter of 1-50nm. The particle length is 150nm, and the structure is a rod-shaped crystal product. Such as image 3 and Figure 4 shown.

[0058] The function of the sulfuric acid solution used in the present invention is to acidolyze the non-crystalline region (amorphous region) of the cellulose in the waste cotton, leaving the crystalline region, thereby preparing cotton nanocrystalline cellulose (CNC). This is because the structure of the non-crystalline region is loose, the bonding between molecules is not strong, the degree of order is not high, and it is easily affected by the acid hydrolysis of sulfuric acid molecules, while the structure...

Embodiment 3

[0060] The waste cotton is preliminarily screened and separated to remove impurities, and then crushed into short cotton. The crushed short cotton is added to a sulfuric acid solution with a mass fraction of 30% and stirred for 60 minutes. The reaction temperature is 80°C. The ratio of sulfuric acid to waste cotton is 15ml: 1g; after the reaction, centrifuge twice, adjust the pH to 6-7, centrifuge twice, and finally ultrasonicate for 20 minutes to obtain waste cotton nano-microcrystalline cellulose; the obtained product has a diameter of 1-100nm and a length of 10- 200nm, the structure is a rod-shaped crystal product.

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Abstract

The invention discloses a rubber composite material of waste cotton material-based nano-microcrystalline cellulose and a preparation method of the rubber composite material. The method comprises the following steps: stirring natural rubber latex, adding cotton nano-microcrystalline cellulose to the natural rubber latex, stirring and mixing, so as to obtain a cotton nano-microcrystalline cellulose / natural rubber mixture; laying, carrying out demulsification coprecipitation, washing participation, and drying until the weight is constant, so as to obtain a solid cotton nano-microcrystalline cellulose / natural rubber mixture; and mixing with white carbon black, so as to obtain the required product. The nano-microcrystalline cellulose disclosed by the invention can be used as a novel reinforcing material for rubber, and has the characteristics of renewability, small density, high strength, biodegradability, biocompatibility, liquid crystalline property and the like; the preparation method is simple and convenient; the raw materials are cheap and available; the reinforcing effect of the cotton nano-microcrystalline cellulose on the rubber is superior to that of the white carbon black; the mechanical property of the rubber is well improved; and the nano-microcrystalline cellulose / white carbon black / rubber composite material can be applied to manufacturing of various vulcanized rubber products.

Description

technical field [0001] The invention belongs to the field of rubber, and in particular relates to a rubber composite material based on waste cotton material and a nano-microcrystalline cellulose and a preparation method thereof. Background technique [0002] Rubber is a material with high elasticity and low strength. Before reinforcing fillers are added, the strength of rubber is poor and cannot meet the requirements of production and life. Therefore, it needs to be reinforced. At present, the commonly used reinforcing fillers in the rubber industry are mainly carbon black and silica. Silica has obvious advantages in improving the heat generation, tear strength and rolling resistance of rubber composites. But white carbon black is a non-renewable resource of fossil products, and its price is high, especially fumed white carbon black, its low density makes processing pollution serious, processing time is long, and energy consumption is high. [0003] Carbon black is a common...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L7/02C08L1/02C08K13/02C08K3/36C08K5/09C08K3/22C08K3/06
CPCC08L7/02C08K3/22C08K3/36C08K5/09C08K5/47C08K13/02C08K2003/2296C08L2205/16C08L1/02
Inventor 古菊黄飞
Owner SOUTH CHINA UNIV OF TECH
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