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A kind of preparation method of modified styrene-butadiene rubber with wide damping temperature range

A styrene-butadiene rubber and damping technology, which is applied in the field of preparation of modified styrene-butadiene rubber, can solve the problems of low service temperature, low glass transition temperature, and narrow temperature range, and achieve good damping performance, good mechanical properties, and easy industrialization Effect

Active Publication Date: 2017-10-27
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] It is well known in the field that high damping materials in a wide temperature range require at least the range of 60-80 °C, and their damping factor tanδ>0.3, but the disadvantage of rubber elastomer damping materials lies in the temperature range of the glass transition zone of a single rubber variety Generally narrow, only 20-40 ° C, and they are concentrated at lower temperatures, (especially styrene-butadiene rubber compared with butyl rubber, nitrile rubber, polyurethane, due to fewer side groups on the molecular chain, side group polarity Weak, its glass transition temperature is lower) so the temperature range of the damping function area is narrow and the operating temperature is low, the damping performance above room temperature is not good, it is difficult to meet the use requirements of submarine anechoic tiles in different sea areas and different temperatures

Method used

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  • A kind of preparation method of modified styrene-butadiene rubber with wide damping temperature range
  • A kind of preparation method of modified styrene-butadiene rubber with wide damping temperature range

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] First, add deionized water into the reaction kettle, stir evenly, start stirring and heat up to 50°C, then add 1g of potassium persulfate, 290g of styrene, 10g of 2-vinylpyridine, add 700g of butadiene after vacuuming, and the whole polymerization The process controls the polymerization temperature at 50°C±2°C. When the conversion rate reaches 100%, the polymerization is terminated, and the material is discharged at room temperature to obtain the product. The appearance of the product is milky white and translucent, and its solid content is about 40% (mass percentage content, the same below).

[0017] Pour 250 g of the above-mentioned modified styrene-butadiene latex into 0.5% (mass percentage content, the same below) hydrochloric acid solution at room temperature for flocculation. Rinse the flocculated product and then dry it. Carry out kneading processing, the reinforcing agent used is 0.1g sodium-based bentonite (produced by Liufangfang, Siping, Jilin), and the plas...

Embodiment 2

[0023] First, add deionized water into the reaction kettle, stir evenly, start stirring and heat up to 55°C, then add 2g of potassium persulfate, 260g of styrene, 20g of 2-vinylpyridine, add 720g of butadiene after vacuuming, and the whole polymerization The process controls the polymerization temperature at 55°C±2°C. When the conversion rate reaches 90%, the polymerization is terminated, and the material is discharged at room temperature to obtain the product. The appearance of the product is milky white and translucent, and its solid content is about 36%.

[0024] 278 g of the above-mentioned modified styrene-butadiene latex was poured into 1% sulfuric acid solution at room temperature for flocculation. Rinse the flocculated product and then dry it. Carry out kneading process, used reinforcing agent is 10g sodium-based bentonite (Jilin Siping Liu house production), and plasticizer is 1g naphthenic oil. Performance testing was carried out after vulcanization, and the proper...

Embodiment 3

[0026] First, add deionized water into the reaction kettle, stir evenly, start stirring and raise the temperature to 60°C, then add 5g of ammonium persulfate, 240g of styrene, 20g of 2-vinylpyridine, add 740g of butadiene after vacuuming, and the whole polymerization The process controls the polymerization temperature at 60°C±2°C. When the conversion rate reaches 85%, the polymerization is terminated, and the material is discharged at room temperature to obtain the product. The appearance of the product is milky white and translucent, and its solid content is about 34%.

[0027] 294 g of the above-mentioned modified styrene-butadiene latex was poured into 1.5% acetic acid solution at room temperature for flocculation. Rinse the flocculated product and then dry it. Carry out mixing processing, used reinforcing agent is 20g white carbon black, and plasticizer is 2g epoxy soybean oil. Performance testing was carried out after vulcanization, and the properties of the rubber mate...

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Abstract

The invention relates to a preparation method of modified styrene butadiene rubber with a wide damping temperature range and belongs to the field of rubber products. 2-vinylpyridine is adopted as a third monomer modifier, and modified emulsion polymerized styrene butadiene rubber synthesized in a free radial emulsion polymerization manner is adopted. Due to introduction of third monomers, polar side groups are added to macromolecular chains of rubber, electropositivity is realized through adsorption of positive ions in a flocculant by the side groups, so that movement of macromolecules is affected, glass transition peaks are widened, and the effective damping temperature range of rubber is widened. The material has better damping performance, has the effective damping temperature range (tan delta>0.3) being70 DEG C or higher, has good mechanical performance, is simple to operate and lower in cost and facilitates industrialization. The prepared damping styrene butadiene rubber is applicable to anechoic tiles of submarines.

Description

technical field [0001] The invention relates to a preparation method of modified styrene-butadiene rubber with a wide damping temperature range, belonging to the technical field of rubber products. Background technique [0002] The acoustic feature control technology of submarines is a comprehensive application technology. The acoustic stealth coating has the functions of damping, sound insulation and noise reduction. The anechoic tile uses the cavity to convert the sound into heat and is consumed. It is a relatively mature anti-sonar detection coating, but at the same time, its construction method, thickness, weight and other defects greatly limit its application range. The high-performance anechoic tile not only has excellent sound absorption performance, but also has excellent sound insulation performance and vibration suppression performance. Among the world’s submarine technology powerhouses, American submarines use polyurethane / glass fiber composite materials and buty...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L15/00C08L91/00C08L91/06C08K3/34C08K3/36C08K3/04C08F236/06C08F212/08C08F226/06C08F2/22
CPCC08F236/06C08L15/00C08L91/00C08K3/346C08K3/36C08L91/06C08K3/04C08F212/08C08F226/06C08F2/22
Inventor 王益庆薛辰沈家锋吴晓辉楼鹏飞张立群
Owner BEIJING UNIV OF CHEM TECH