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联系我们公司主营业务为高硬脆材料切割设备、切割耗材的研发、生产、销售及其配套服务。基于自主核心技术，公司主要面向光伏行业生产厂商提供硅棒至硅片“截断、开方、磨抛、切片”环节的系统解决方案。光伏行业全球前十名硅片制造企业均为公司客户。 -
联系我们公司主营业务为高硬脆材料切割设备、切割耗材的研发、生产、销售及其配套服务。基于自主核心技术，公司主要面向光伏行业生产厂商提供硅棒至硅片“截断、开方、磨抛、切片”环节的系统解决方案。光伏行业全球前十名硅片制造企业均为公司客户。
Blog
20
2023
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06
Introduction of special rubber materials-ethylene-propylene rubber series
Ethylene-propylene rubber [Ethylene Propylene Diene Monomer,EP(D)M; It was once called EPR in China] is a copolymer rubber molecular chain synthesized from ethylene and propylene based monomers. It is divided into binary ethylene-propylene rubber and EPDM rubber according to the composition of monomer units.
A brief introduction:
Ethylene-propylene rubber [Ethylene Propylene Diene Monomer,EP(D)M; It was once called EPR in China] is a copolymer rubber molecular chain synthesized from ethylene and propylene based monomers. It is divided into binary ethylene-propylene rubber and EPDM rubber according to the composition of monomer units. EPDM is a copolymer of ethylene and propylene, expressed as EPM; EPDM is a copolymer of ethylene, propylene and a small amount of non-conjugated diene third monomer, expressed as EPDM, and the two are collectively referred to as ethylene propylene rubber EP(D)M.
The vast majority of EPDM on the market has only two third monomers: ethylidene norbornene (ENB) and dicyclopentadiene (DCPD). ENB-EPDM sulfur sulfur speed, high production efficiency, DCPD-EPDM although the speed of sulfur sulfur is relatively slow, but the speed of peroxide vulcanization is relatively fast.
The biggest difference between ethylene-propylene rubber and other general-purpose rubber is the low degree of unsaturation of the molecular chain. Taking EPDM and NR as an example, the NR molecular chain contains about 250 double bonds per 1000 carbon atoms; while the EPDM molecular chain contains only about 10 double bonds per 1000 carbon atoms. On the one hand, the chemical stability of EPDM is much better than that of NR. This is because in the vulcanization process, there will be many double bonds in the NR molecular chain that are not used by sulfur crosslinking, which is vulnerable to the action of external factors and leads to the fracture and destruction of chemical bonds, which is also the main reason for the poor ozone resistance and weather resistance of NR. On the other hand, the vulcanization of EPDM is more difficult and slower than that of NR, and the amount of accelerator required for EPDM vulcanization is more than that of NR.
Ethylene propylene rubber because the main chain is composed of chemically stable saturated hydrocarbons, only in the side chain containing unsaturated double bonds, so its ozone resistance, heat resistance, aging resistance is excellent, has good chemical resistance, electrical insulation properties, impact elasticity, low temperature performance, low density and high filling and hot water resistance and water vapor resistance, etc, can be widely used in automotive parts, building waterproof materials, wire and cable sheath, heat-resistant hose, tape, automotive seals and other products. As the ethylene-propylene diene rubber is located on the side chain, it can not only use sulfur and sulfur, but also maintain the various characteristics of binary ethylene-propylene rubber, thus becoming the main variety of ethylene-propylene rubber and widely used, accounting for about 90% of the brand of ethylene-propylene rubber. However, due to the fact that the molecular chain of binary ethylene-propylene rubber does not contain double bonds, it cannot be vulcanized with sulfur. It can only be vulcanized with compounds such as peroxides that can produce free radical crosslinking, or radiation vulcanization is used, thus limiting its application, accounting for only about 10% of the total number of ethylene-propylene rubber brands.
Why carbon black and coke are not adsorptive
Carbon black and coke are carbon materials, but their adsorption properties are very different. Carbon black has strong adsorption and can be used to prepare various adsorbents, while coke has almost no adsorption. Why is this?
2023-06-14
The "ground refinery" has faded from the spotlight, and how to recycle waste tires with low consumption and harmlessness has attracted much attention. On the other hand, the state recently added waste tires, waste rubber products production of recycled oil, cracking carbon black tax rebate, but also further stimulate the enthusiasm of industrial capital entry.
2023-06-14
Application and Development Trend of Thermal Conductive Absorbing Materials
With the development of electronic technology, the new generation of electronic components from consumer electronics such as mobile phones and tablet computers to RFFE/antenna modules for 5G communication, MIMO, wifi6, radar and optical modules for optical communication have higher data transmission rate, higher power density and higher transmission frequency band, and require electronic equipment to have more functional modules while maintaining the existing volume or even reducing the volume, the electronic equipment will generate a large amount of waste heat when working.
2023-06-20
Introduction of special rubber materials-chlorosulfonated polyethylene rubber (CSM)
Chlorosulfonated polyethylene (alias: Haibolong Haibolong hypalon) is a kind of special rubber made by chlorination and chlorosulfonation of polyethylene. After chlorination and sulfonation of polyethylene, the regularity of its structure is destroyed, and it becomes soft and elastic chlorosulfonated polyethylene rubber at room temperature.
2023-06-20
Ultra-high thermal conductivity, ultra-flexible thermal conductive gasket
Ultra-high thermal conductivity, ultra-flexible thermal gasket is a thermal conductivity greater than 12 W/m · K, and both excellent flexibility series products, as shown in Table 1. This series of products is to solve the problem of heat dissipation between high heat flux and highly integrated electronic equipment heating devices and heat sinks.
2023-06-20
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