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Preparation method of high-performance and low-temperature vulcanized natural rubber

A technology of natural rubber and low-temperature vulcanization, applied in the field of high-performance, low-temperature vulcanized natural rubber, can solve the problems of cross-linking bond breakage, decrease in physical and mechanical properties of vulcanizate, vulcanization reversion, etc., and achieve the effect of excellent performance

Inactive Publication Date: 2012-06-13
HAINAN UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Rubber is a high-molecular polymer. If the vulcanization temperature is too high, the molecular chain of the rubber will undergo a cracking reaction, resulting in the breakage of the cross-linking bond, that is, the phenomenon of "vulcanization reversion", which will reduce the physical and mechanical properties of the vulcanized rubber.

Method used

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  • Preparation method of high-performance and low-temperature vulcanized natural rubber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] a. Mix 200g of corn or tapioca starch with 2000ml of water, stir to form a starch emulsion, add 100ml of sodium hydroxide solution with a mass concentration of 15%, stir for 15min, then add 20ml of carbon disulfide, stir at a constant temperature of 30°C for 1h, and dry with hot air dry, to prepare starch xanthate;

[0022] b. Add the starch xanthate prepared in "a" to natural rubber by 5 parts by weight, knead on a double-roller mill, and add various additives, in order: 6.0 parts of zinc oxide, hard 0.5 part of fatty acid, 0.5 part of accelerator M, and 3.5 parts of sulfur to obtain the rubber compound;

[0023] c. Vulcanize the mixed rubber prepared in "b" at 60°C, 80°C and 100°C respectively according to the normal curing time to obtain vulcanized natural rubber. The physical and mechanical properties were tested according to national standards, and the obtained properties are shown in Table 2.

Embodiment 2

[0025] Except that starch xanthate is 15 parts, other is identical with embodiment 1.

Embodiment 3

[0027] Except that starch xanthate is 25 parts, other is identical with embodiment 1.

[0028] Table 1 is the main formula of natural rubber of embodiment 1, example 2 and example 3.

[0029] Table 2 is the physical and mechanical properties of the vulcanized natural rubber of Example 1, Example 2 and Example 3.

[0030]

[0031] Table 1 implementation scheme and comparative scheme formula (parts)

[0032] raw material Example 1 Example 2 Example 3 comparative example natural rubber 100.00 100.00 100.00 100.00 Zinc oxide 6.00 6.00 6.00 6.00 stearic acid 0.50 0.50 0.50 0.50 Accelerator M 0.50 0.50 0.50 0.50 sulfur 3.50 3.50 3.50 3.50 starch xanthate 5.00 15.00 25.00 —

[0033] Table 2 Physical and mechanical properties of vulcanized natural rubber

[0034]

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Abstract

The invention discloses a preparation method of high-performance and low-temperature vulcanized natural rubber, relates to a preparation method of a vulcanized natural rubber. In the formula of natural rubber, starch xanthate is added, and other auxiliaries, namely stearic acid, zinc oxide, a promoter M and sulfur are unchanged. Natural rubber is vulcanized at a lower temperature by virtue of an ordinary rubber processing technology and equipment in the presence of starch xanthate serving as a natural rubber modification auxiliary to prepare the high-performance vulcanized natural rubber.

Description

technical field [0001] The invention relates to a method for preparing natural rubber, in particular to a method for preparing high-performance, low-temperature vulcanized natural rubber. Background technique [0002] Natural rubber is a natural polymer material with high elasticity. However, in most cases, raw rubber is sticky at high temperature and hard and brittle at low temperature, neither of which exhibits high elasticity, so that rubber has not been widely used for a long time after its discovery. Vulcanization refers to the chemical change process in which the linear macromolecular chains of rubber form a three-dimensional network structure through chemical crosslinking, thereby improving the performance of rubber. The vulcanization process of rubber is a complex chemical reaction process involving multiple components, which is affected by vulcanization temperature, time and pressure. The vulcanization temperature determines the quality of rubber products. The vul...

Claims

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Application Information

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IPC IPC(8): C08L7/00C08L3/06C08J3/24C08K13/02C08K5/09C08K3/22C08K3/06C08B31/02
Inventor 汪志芬李思东罗文杰方林符新林华
Owner HAINAN UNIVERSITY
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