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Natural rubber sponge with high compression load retention rate and preparation method thereof

A natural rubber, high-compression technology, applied in the field of natural rubber sponge and its preparation, can solve the problems of difficult to meet the use requirements of precision instruments, large compression set, low load retention rate, etc., and achieves good appearance, high compression recovery rate, Uniform and consistent effect of internal cells

Active Publication Date: 2015-11-04
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional natural rubber sponge has a large compression set (at 45°C, when the compression is 55%, the compression is greater than 50% in 48 hours), and the load retention rate is low (<70%) when the compression is large, it is difficult to meet the requirements of precision instruments in large compression strain and small compression. Requirements for the use of amplitude conditions

Method used

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  • Natural rubber sponge with high compression load retention rate and preparation method thereof
  • Natural rubber sponge with high compression load retention rate and preparation method thereof
  • Natural rubber sponge with high compression load retention rate and preparation method thereof

Examples

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Effect test

preparation example Construction

[0043] The preparation method of high load retention rate natural rubber sponge of the present invention is characterized in that comprising the following steps:

[0044] a. Mastication of natural rubber

[0045] The natural rubber with a molecular weight distribution between 30,000 and 30 million is mechanically masticated by equipment such as an open mixer, internal mixer or screw plastic mixer to break the main chain, thereby reducing the viscosity of the natural rubber and increasing its Good dispersion of fillers and compounding agents increases plasticity and improves processing performance. There are no specific restrictions on the equipment and time of mastication. For example, the number of mastication times on the open mill is generally 50-65 times, and the plasticity is preferably 70-80.

[0046] b. Mixing of natural rubber with silica powder, petrolatum, anti-aging agent and other additives

[0047] The natural rubber masticated rubber obtained after mastication,...

Embodiment 1

[0057]

[0058] At room temperature, add the grade 1 crepe rubber into the rubber refining type double-roller open mill, and carry out mastication under the condition of passing cooling water. The mastication is carried out in 4 times, and the number of times for each time is about 16 times. Thereby obtaining the natural rubber mastication rubber with a plasticity of 70-80.

[0059] In the rubber refining type double-roller open mill, add fumed silicon dioxide AS200 (trade name, manufactured by Shenyang Chemical Plant) with a BET specific surface area of ​​200m2 / g and medical vaseline to the natural rubber plastic compound, and disperse evenly , then add 2,5-dimethyl-2,5-di-tert-butylperoxyhexane to disperse evenly, then add 2,2,4-1,2-dihydroquinoline polymer (abbreviated as antioxidant RD) , and the natural rubber sponge masterbatch is obtained after uniform dispersion. After the rubber material is cooled to room temperature, add N,N'-dinitrosopentamethylenetetramine (foa...

Embodiment 2

[0063]

[0064] According to the given content of each component, the method of Example 1 was repeated, but the vulcanization and foaming temperature was 143° C., and the molding time was 8 minutes.

[0065] The natural rubber sponge was made into various samples after precision slicing, and its composition and physical and mechanical properties are shown in Table 1.

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Abstract

The invention discloses natural rubber sponge with a high compressive load retention rate. The natural rubber sponge is mainly composed of the following components by weight percent: 55%-75% of natural rubber, 5%-25% of silicon dioxide powder, 2%-10% of softener, 0.5%-3% of anti-aging agent, 2%-8% of organic foaming agent, 0.5%-2% of vulcanizing agent and 0.5%-2.5% of vulcanization accelerator. The invention also discloses a preparation method of the natural rubber sponge with the high compressive load retention rate. According to the invention, the natural rubber sponge with the high compressive load retention rate can be obtained, and the obtained natural rubber sponge has the following characteristics: excellent appearance, homogeneous and consistent internal pores, density ranging from 0.3g / cm<3> to 0.6g / cm<3>, a compression recovery rate of greater than 95%, permanent deformation of less than 20% after being compressed for 48h when the compression amount is 55% at 45 DEG C, and the compressive load retention rate of greater than 80% under large compression deformation (45%) for 3h.

Description

technical field [0001] The invention relates to a natural rubber sponge and a preparation method thereof, in particular to a natural rubber sponge with high compressive load retention ratio compounded with nano silicon dioxide powder and a preparation method thereof. Background technique [0002] Natural rubber (NR) has excellent adhesive properties, high tensile strength and crack growth resistance. It is currently the rubber material with the best comprehensive performance and the most widely used, and occupies a unique position in the rubber industry. Natural rubber sponge (referred to as sponge) is composed of a continuous solid phase of natural rubber and a gas phase of numerous microscopic pores uniformly dispersed. Due to its porous characteristics, it has a wide range of applications in heat insulation and packaging. [0003] The traditional natural rubber sponge has a large compression set (at 45°C, when the compression is 55%, the compression is greater than 50% in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L7/00C08K13/02C08K3/36C08J9/10B29B7/00
Inventor 石耀刚许治国赵秀丽王建华崔锦林陈立新周安伟曹君
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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