Balanced vulcanization system for resisting high-temperature vulcanization reversion of natural rubber

A vulcanization system and vulcanization reversion technology, applied in the field of new balanced vulcanization system, can solve the problems of vulcanization speed influence, vulcanized rubber performance, easy reversion, etc., to achieve the effect of realizing production efficiency and shortening vulcanization time

Inactive Publication Date: 2019-05-24
T RUBBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current solution is to add a small amount of anti-reversion agent, but it will affect the vulcanization speed, it is easy to be under-sulfured, and at the same time affect the performance of the vulcanized rubber. reversion
The typical vulcanization characteristic curve of natural rubber is shown in the attached manual figure 1 As shown, with the traditional vulcanization system, high temperature vulcanization is easy to revert, and the addition of anti-reversion agent causes slow vulcanization, while the new balanced vulcanization system is ideally flat

Method used

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  • Balanced vulcanization system for resisting high-temperature vulcanization reversion of natural rubber
  • Balanced vulcanization system for resisting high-temperature vulcanization reversion of natural rubber
  • Balanced vulcanization system for resisting high-temperature vulcanization reversion of natural rubber

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Experimental program
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Effect test

Embodiment 1

[0021] A balanced vulcanization system formulation for natural rubber resistant to high-temperature vulcanization reversion, consisting of the following raw materials in parts by mass:

[0022]

[0023] The equilibrium vulcanization system is composed of N, N-dithiodicaprolactam, sulfur, and benzothiazole disulfide, with a mass ratio of 1:0.5:1.

[0024] Thin-pass plasticizing of natural rubber on the open mill, control the temperature of the rollers below 30°C, cool and park for 12-24 hours after feeding; wrap the plasticized natural rubber on the rollers of the open mill according to the formula, press Add various additives sequentially in the order of feeding, fully mix evenly and then release the sheet. During the mixing process, control the roller temperature below 50°C; test the vulcanization characteristic curve after cooling and parking for 12 hours, and vulcanize the standard test sample on a flat vulcanizing machine according to the vulcanization conditions (artic...

Embodiment 2

[0034] A balanced vulcanization system formulation for natural rubber resistant to high-temperature vulcanization reversion, consisting of the following raw materials in parts by mass:

[0035]

[0036] The equilibrium vulcanization system is composed of N, N-dithiodicaprolactam, sulfur, and benzothiazole disulfide, with a mass ratio of 1:1:1.5.

[0037] Put the natural rubber on the open mill for thin pass plasticizing, control the temperature of the rollers below 40°C, cool and park for 12-24 hours after feeding; wrap the plasticized natural rubber on the rollers of the open mill according to the formula, press Add various additives sequentially in the order of feeding, fully mix evenly, and then release the sheet. During the mixing process, control the roller temperature below 60°C; test the vulcanization characteristic curve after cooling and parking for 12 hours, and vulcanize the standard test sample on a flat vulcanizer according to the vulcanization conditions. (art...

Embodiment 3

[0047] A balanced vulcanization system formulation for natural rubber resistant to high-temperature vulcanization reversion, consisting of the following raw materials in parts by mass:

[0048]

[0049] The equilibrium vulcanization system is composed of N,N-dithiodicaprolactam, sulfur, and benzothiazole disulfide, with a mass ratio of 1:1:2.

[0050] Put the natural rubber on the open mill for thin pass plasticizing, control the temperature of the rollers below 40°C, cool and park for 12 to 24 hours after unloading; wrap the plasticized natural rubber on the rollers of the open mill according to the formula, and press Add various additives sequentially in the order of feeding, fully knead and then release the sheet. During the kneading process, control the roller temperature below 60°C; test the vulcanization characteristic curve after cooling and parking for 12 hours, and vulcanize the standard test sample on a flat vulcanizer according to the vulcanization conditions (ar...

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Abstract

The invention provides a balanced vulcanization system for resisting high-temperature vulcanization reversion of natural rubber, in particular to a vulcanization system of natural rubber which adoptsN,N-dithiodicaprolactam as a main body and is composed of a vulcanization activator, a vulcanization accelerator, sulfur and the like in order to prevent the phenomenon of vulcanization reversion fromhappening to the natural rubber under a high-temperature vulcanization condition. The vulcanization curve has a long flattening period, and the vulcanization strength of R97 is 10 times higher than that of Tc90. Meanwhile, the vulcanized rubber has high physical and mechanical properties, wherein the tensile strength reaches more than 22 MPa, the elongation at break reaches more than 500%, and the stability of the physical and mechanical properties of the vulcanized rubber can be kept. Under the condition of 1-10-time vulcanization of Tc90, and the change rate of the tensile strength and elongation at break of the vulcanized rubber is smaller than 3%. The natural rubber matched with the novel balanced vulcanization system has stable product performance and uniform quality after being vulcanized, correspondingly the vulcanization time can be shortened by raising the vulcanization temperature, and the production efficiency is thus improved.

Description

technical field [0001] The invention relates to a novel balanced vulcanization system for natural rubber resistant to high-temperature vulcanization reversion. Background technique [0002] Natural rubber has a series of excellent comprehensive properties such as good elasticity, high strength, and excellent processing performance, and is the most widely used general-purpose rubber. Due to the olefinic macromolecular structure of natural rubber and the chemical composition of plant base, during its high-temperature vulcanization process, vulcanization reversion is prone to occur, that is, thermal degradation of the cross-linked bonds of vulcanized rubber, thermal oxygen aging and other factors. main chain modification. On the natural rubber vulcanization characteristic curve, the performance is flat and the vulcanization period is very short. After the torque reaches the peak value (positive vulcanization), it gradually begins to decline and enters the over-vulcanization pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L7/00C08L57/02C08K13/02C08K5/378C08K3/06C08K5/47C08K3/22
Inventor 刘大晨果翔李乐郑伟王素菊张学顺冯海凤宋文涛
Owner T RUBBER
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