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Rubber composition with low zinc oxide content and preparation method thereof

A technology of rubber composition and zinc oxide, which is applied in the field of rubber materials, can solve the problems of non-compliance with the green and low-carbon sustainable development strategy, the environmental hazards of nano-scale zinc oxide, and the complicated production process of zinc compounds, so as to improve the activation efficiency , easy industrial production, low cost effect

Active Publication Date: 2020-05-12
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, zinc oxide is extremely toxic to aquatic organisms and is a substance harmful to the environment, especially having long-term adverse effects on the water body environment; at the same time, the industrial production process of zinc oxide is complex and energy-intensive, and requires the use of a large amount of acid and alkali non-toxic solution, which not only increases the production cost, but also does not conform to the green and low-carbon sustainable development strategy
[0004] At present, there are two main technical methods for reducing the amount of zinc oxide in rubber products: one is to use nano-scale zinc oxide to improve the activation efficiency, but the environmental hazards of nano-scale zinc oxide are greater; the other is to use zinc compounds to replace oxidation Zinc, but the production process of zinc compounds is complex and energy-intensive

Method used

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  • Rubber composition with low zinc oxide content and preparation method thereof
  • Rubber composition with low zinc oxide content and preparation method thereof
  • Rubber composition with low zinc oxide content and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-6

[0026] The preparation method of the rubber composition of embodiment 1-6 low zinc oxide

[0027] Embodiments 1-6 are respectively a preparation method of a zinc oxide-low rubber composition (styrene-butadiene rubber containing carbon nano-dots 1), which are all carried out according to the following steps:

[0028] (1) Preparation of carbon nanodots 1

[0029] According to the equimolar ratio of carboxylic acid groups to amino groups, take acrylic acid and butylenediamine, prepare an aqueous solution (the concentration of acrylic acid is 200 mg / mL), and heat it under 600 W microwave power for 5 min to obtain carbon nanodot1;

[0030] (2) Preparation of styrene-butadiene rubber containing carbon nanodots 1

[0031] According to the dosage in Table 1, styrene-butadiene rubber, carbon nano-dots 1, zinc oxide, stearic acid, rubber accelerator CZ (N-cyclohexyl-2-benzothiazole sulfenamide), rubber accelerator DM ( 2, 2'-dithiodibenzothiazole) and sulfur, and added to an internal...

Embodiment 7

[0036] The performance test of the rubber composition of embodiment 7 low zinc oxide

[0037] In this example, the properties of the products obtained in Examples 1-6 (i.e. low zinc oxide rubber composition) were comprehensively tested according to the Chinese national standard GB / T 528-2009, and their typical performance changes are shown in Table 2 below:

[0038] Table 2

[0039] .

[0040] The above test results show that, compared with the product obtained in Example 6 (comparative example), as the content of zinc oxide replaced by carbon nano-dots increases, the scorch and normal vulcanization times of the products obtained in Examples 1 to 5 are significantly shortened, and the lowest The torque ML and the maximum torque MH remained basically unchanged, indicating that the crosslinking density of the vulcanizate did not change significantly. In addition, the 100% modulus and tensile strength of the vulcanizate remained basically unchanged.

Embodiment 8-13

[0041] The preparation method of the rubber composition of embodiment 8-13 low zinc oxide

[0042] Examples 8-13 are respectively a preparation method of a zinc oxide-low rubber composition (natural rubber containing carbon nano-dots 2), which are all carried out in the following order:

[0043] (1) Preparation of carbon nanodots 2

[0044] According to the ratio of 3:1 molar ratio of carboxylic acid groups to amino groups, citric acid and ethylenediamine were prepared into an aqueous solution (the concentration of citric acid was 100 mg / mL), and under the microwave power of 750 W Heating for 3 min to obtain carbon nanodots 2;

[0045] (2) Preparation of natural rubber containing carbon nanodots 2

[0046] According to the dosage in Table 3, natural rubber, carbon nano-dots 2, zinc oxide, stearic acid, rubber accelerator DM, rubber accelerator NS (N-tert-butyl-2-benzothiazole sulfenamide) and Sulfur was added to the open mill, and blended at room temperature for 10 min to o...

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Abstract

The invention discloses a rubber composition with low zinc oxide content. Raw materials for preparing the rubber composition comprise olefin rubber, carbon nanodots, zinc oxide, stearic acid, a rubberaccelerator and sulfur. The invention further discloses a preparation method of the rubber composition with low zinc oxide content. The preparation method comprises the steps of raw material blending, rubber compound vulcanization and the like. Reduction of zinc oxide in rubber is achieved by adding the carbon nanodots, emission of zinc oxide serving as an environment harmful substance is effectively reduced, the preparation process is simple, the cost is low, industrial production is easy, and the preparation method has great development prospects in the aspect of preparation of green rubbervulcanization activators and is suitable for production and preparation of all rubber compositions.

Description

technical field [0001] The invention belongs to the technical field of rubber materials, and relates to a rubber composition and its preparation, in particular to a low-zinc oxide rubber composition and a preparation method thereof. Background technique [0002] Rubber vulcanization refers to the process in which the linear molecular chains of rubber form a three-dimensional network structure through chemical cross-linking under certain temperature and pressure. In the prior art, in order to increase the vulcanization rate and the crosslink density of the vulcanized rubber, and improve the performance of the final product, it is usually necessary to add 3-5% zinc oxide as an activator during the vulcanization process. [0003] The addition of zinc oxide will lead to the release of a large amount of zinc oxide to the surrounding environment during the use of rubber products and the subsequent waste degradation process. However, zinc oxide is extremely toxic to aquatic organi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L9/06C08L7/00C08L9/02C08L9/00C08K13/06C08K9/04C08K3/04C08K3/22
CPCC08K3/04C08K3/22C08K9/04C08K13/06C08K2003/2296C08K2201/011C08L9/00C08L9/06C08L2205/025C08L2205/03C08L7/00C08L9/02
Inventor 郭宝春李博吴思武
Owner SOUTH CHINA UNIV OF TECH
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