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Cold resistant rubber

A technology of cold-resistant rubber and main rubber, which is applied in the field of rubber and can solve problems such as brittleness, hardening, and decreased elongation at break.

Inactive Publication Date: 2008-12-31
南京固柏橡塑制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Usually, the rubber (sheet) used in some low temperature environments is prone to premature hardening and embrittlement and loses the unique elasticity of rubber and loses its use value.
At present, some rubber sheets become hard and brittle at 20°C to -30°C, lose their inherent elasticity, their tear strength drops by 30% (up to 2.1MPa), and their elongation at break drops by 50% (up to 130%) ), the hardness rises to more than 80 Shore

Method used

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Examples

Experimental program
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Effect test

Embodiment 101-110

[0018] When 100kg of natural rubber is used as the main material to prepare the cold-resistant rubber sheet of the present invention, the material is firstly pretreated, and then the natural rubber is subjected to low-temperature thin-pass segmental mastication in an open mill, and the roller temperature is controlled between 40-60°C. During the first stage of mastication, it needs to be parked for 4-8 hours, then the second stage of plastication is carried out, and then it is parked for 8-24 hours for use. When mixing, first add reinforcing agent, filler, plasticizer softener, accelerator, active agent, anti-aging agent of different weights in Table 1, and finally add vulcanizing agent. A while to spare. When rolling out the sheet, the parked mixed rubber is first heat-smelted, thinned several times, and then the thickness is adjusted on the calender according to the product requirements, and the sheet is evenly released, so that it is preformed and vulcanized by pressure and...

Embodiment 201-210

[0020] Referring to Table 2, when using 100kg nitrile rubber as the main material to prepare the cold-resistant rubber sheet of the present invention, at first the selected material is pretreated. Then the nitrile rubber is subjected to three-stage thin-pass mastication with a small roller distance and a low roller temperature (40-50°C). The mastication time of each stage is about 20 minutes, and it is fully parked and cooled in the middle. The performance of the mixing process of nitrile rubber is poor, the mixing time is long, and the heat generation is large, which is easy to cause scorch. The specific operation method and the order of adding materials (compounding agents with different weights in Table 2) are generally as follows. The roll temperature is kept at 40-45°C, and the roll distance is preferably 3-4mm. Add anti-aging agent, filler, etc. after the rubber material starts to soften, it is best to add reinforcing agent and liquid plasticizing softener alternately in...

Embodiment 301-310

[0023] See Table 3. When using different weights of natural rubber and butadiene rubber together as the main material to prepare the cold-resistant rubber sheet, the selected materials are firstly pretreated, and then the natural rubber and butadiene rubber are masticated respectively. The method described in implementation case 1 carries out one section of plasticizing and stands for use. Butadiene rubber has a low molecular weight and lacks mastication effect, but proper mastication can make the rubber texture uniform and improve the physical and mechanical properties of the vulcanized rubber. Therefore, after the butadiene rubber is masticated at low temperature for a short time, the natural rubber that has been masticated for a period of time can be added for mixing and thinning. After the blended and masticated natural rubber and butadiene rubber are parked (about 10 hours), add different weights of compounding agents in Table 3 and mix them. The order of addition is gene...

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Abstract

The invention aims at providing a low-temperature resistant rubber which can be used for a long time in low temperature and has almost the same tensile strength and elongation at break and the same hardness at low temperature as at normal temperature. The low-temperature resistant rubber contains main body rubber, strengthening agent, plasticization softener and curing ingredient, and the weight ratio of main body rubber : strengthening agent : plastifying softener : curing ingredient is 100:10-350:5-75:0.5-3; the main body rubber is natural gum, styrene-butadiene-rubber, cis-butadiene rubber, butyl rubber, ethylene propylene diene rubber, butadiene nitrile rubber or the combination of natural gum and cis-butadiene rubber; the strengthening agent is black carbon or white carbon; the plastifying softener is machine oil, transformer oil, dibutyl sebacate, dibutyl phthalate or silicon oil; the curing ingredient is 2,5-dimethyl curing ingredient or sulphur.

Description

technical field [0001] The invention relates to a rubber, especially a rubber with excellent cold resistance. Background technique [0002] Generally, the rubber (plate) used in some low temperature environments is prone to premature hardening and embrittlement, and loses the unique elasticity of rubber and loses its use value. At present, some rubber sheets become hard and brittle at 20°C to -30°C, lose their inherent elasticity, their tear strength drops by 30% (up to 2.1MPa), and their elongation at break drops by 50% (up to 130%) ), the hardness rises to more than 80 Shore. Contents of the invention [0003] The object of the present invention is to provide a kind of cold-resistant rubber which can be used for a long time under low temperature conditions, and whose tear strength, elongation at break, and hardness are basically unchanged from those at normal temperature. [0004] The cold-resistant rubber includes a main body rubber, and is characterized in that it al...

Claims

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Application Information

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IPC IPC(8): C08L7/00C08L9/06C08L9/00C08L23/22C08L23/16C08L9/02C08L83/04C08K13/02
Inventor 张收才江文根陈玉斌
Owner 南京固柏橡塑制品有限公司
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