WEIFANG FENGHUANG NEW MATERIAL CHEMICAL CO.,LTD
(Chlorosulfonated polyethylene) CSM is a synthetic rubber based on polyethylene. This rubber is a material with Neoprene Polychloroprene plus other qualities. The CSM rubber is suitable for continuous use up to about 130 degree celcius. Chlorosulfonated polyethylene (CSM) is known for its excellent resistance to atmospheric conditions and good resistance to chemicals. Chlorosulfonated polyethylene is used in a variety of industrial and automotive applications that require high performance and have to withstand extreme weather conditions. Some poducts where chlorosulfonated polyethylene rubber is used include rubber linings, hoses, valve seals and gaskets etc.
Application:
CSM is used in a number of applications. Variety of products are made using CSM. Some of the popular uses and applications of Hypalon or chlorosulfonated polyethylene (CSM) are as follows:· Construction industry uses CSM for roofing membranes, liners and covers for portable water reservoirs etc.
· Automotive industry uses chlorosulfonated polyethylene for making hoses, tubing and belts etc. Automotive components like high-temperature timing belts and power steering are made of CSM.
· Wire and cable industry uses CSM for making molded goods, coatings and adhesives. It is widely used for jacketing and insulation for wire and cable
· For manufacturing of such industrial products as hose, rolls, seals, gaskets, diaphragms and lining for chemical processing equipment also, chlorosulfonated polyethylene is a preferred choice.
· Some other products where CSM is used widely include rubber coating shoe soles, flexible tubes, flexible magnetic binders, and a host of protective and decorative coatings
Cas No.:68037-39-8
Appearance:White or yellow elastomer
Features:Tasteless, Odorless, Non-toxic.
Qty:15MT/20GP, 26MT/40HQ with pallets
Weight:25kg, 500kg
Packaging:PP or Kraft paper bags
Customization:Available
| Project |
Unit |
HT-403 |
HT-503 |
HT-603 |
HT-703 |
HT-803 |
HT-903 |
HT-604 |
HT-48 |
| Chlorine content |
% |
35+2 |
35+2 |
35+2 |
35+2 |
35+2 |
35+2 |
43+2 |
43+2 |
| Sulfur content |
% |
1.0~1.5 |
1.0~1.5 |
1.0~1.5 |
1.0~1.5 |
1.0~1.5 |
1.0~1.5 |
1.0~1.5 |
1.0~1.5 |
| Volatile matter |
%≤ |
0.5 |
0.5 |
0.5 |
0.5 |
0.5 |
0.5 |
0.5 |
0.5 |
| Tensile strength |
MPaz≥ |
25 |
25 |
25 |
25 |
25 |
25 |
25 |
25 |
| Elongation at break |
%≥ |
450 |
450 |
450 |
450 |
450 |
450 |
450 |
450 |
| Mooney viscosity |
ML(1+4) 1009C |
40~50 |
50-60 |
60~70 |
70~80 |
85~95 |
95~110 |
50~70 |
70~90 |
Physical And Chemical Properties
It is a kind of saturated elastomer with polyethylene as the main chain, the average molecular weight is 30,000~120,000, of which CSM2910 is 30,000, CSM4010 is 40,000, CSM3304 is 120,000, C,SM2305 is 100,000. chlorosulphonated polyethylene is a white or milky white flake or granule solid, relative density 1.07~1.28, Mooney viscosity 30~90, brittleness temperature 1.56~1.40ºC. The relative density is 1.07~1.28, the Menni viscosity is 30~90, the brittleness temperature is 1.56~1.40°C. The chemical structure of CSM is fully saturated, it has excellent ozone resistance, weather resistance, heat resistance, flame retardant, water resistance, chemical resistance, oil resistance, abrasion resistance, etc. The solubility parameter of CSM is δ=8.9, it is soluble in hand aromatic hydrocarbons and halogenated hydrocarbons, it only soluble in ketone, ester, and ether but not in solubility, it is insoluble in aliphatic hydrocarbons and alcohols, and the solubility parameter of CSM is δ=8.9. It is insoluble in aliphatic hydrocarbons and alcohols.
It has the common properties of raw rubber, and at the same time, it has its own unique properties, such as excellent ozone resistance, atmospheric aging resistance, chemical corrosion resistance, etc., good physical and mechanical properties, aging resistance, heat resistance and low temperature resistance, oil resistance, flame resistance, abrasion resistance, and electrical insulation resistance.
Performances
Chlorosulfonated polyethylene is a special chlorine-containing elastomer material with a highly saturated chemical structure produced by chlorination and chlorosulfonation of the main raw material of polyethylene, which is a high-performance quality of special rubber varieties. Its appearance is white or milky-white elastic material with thermoplasticity. As the molecular structure contains chlorosulfonyl active groups, it shows high activity, especially resistance to chemical media corrosion, ozone oxidation and oil erosion, flame retardant properties, but also weathering, heat, ion radiation, low temperature, abrasion resistance and electrical insulation and excellent mechanical properties. CSM was developed for military engineering purposes in the early days, but due to its large permanent deformation, it also limits the scope of its use.
Production Method
There are two methods for the production of chlorosulfonated polyethylene, solvent method and gas-solid method. Traditional solvent method: It is a liquid phase manufacturing process using chlorine gas, sulfur dioxide, etc. as chlorosulfonylating agent, and its main disadvantage is the low utilization rate of sulfur dioxide (20-30%), and the chlorine content of the product is only 25-45%. Containing 0.8-1.7% sulfur, the fatal drawback is the need to use carbon tetrachloride as a solvent. In addition, the liquid-phase process has a cumbersome post-treatment process (removal of acid gases, CSM coalescence and separation operations, etc.). Gas-phase process: the synthesis process was reported as early as in the 1980s, but the earliest industrialized device was put into use only in 2009, this process is developed by the domestic company's own organization, and the same year, the product trial was successful, in May 2010, gas-solid chlorosulphonated polyethylene production process passed the appraisal of scientific and technological achievements organized by the China Petroleum and Chemical Industry Federation. The biggest breakthrough of gas-solid production process is that it does not use organic solvents at all, and the materials are directly contacted by the reaction gas, which shortens the process flow and makes the process green and environmentally friendly.
Applied Technology
Sulfide system
It has been argued that the statement "MgO, ZnO are CSM vulcanization systems" is not reasonable. Most of the information on CSM and chlorinated polymer compounding and vulcanization comes from Japan, such as the section on chlorinated polyethylene and chlorosulfonated polyethylene in the Rubber Industry Handbook, Division I. The information on CSM and chlorinated polymer compounding and vulcanization comes from Japan. And part of the academic literature on such, or copied (I can not say reference, because this has not been given to their own experiments and thinking) some of the original information.
In CR and CIIR, metal oxides can be used for cross-linking because of the presence of highly reactive allyl chloride. In chlorinated polymers such as CSM and CM, there is no such active chlorine as the active point for vulcanization, so it cannot be vulcanized so easily. Fortunately, in CSM, sulfonation is carried out, and a more reactive "sulfonyl chloride" group appears, which can be vulcanized much more easily than in CM. The commonly used TRA in CSM formulation is the most effective vulcanizing agent (not vulcanization accelerator) for CSM, and it can also vulcanize CSM when there is no oxide such as magnesium oxide, etc. The addition of magnesium oxide only serves as an acid absorber, and at the same time, it can make the performance improved.
However, there is a strange point that the addition of zinc oxide (ZnO), on the contrary, affects the efficiency of vulcanization. It shows that zinc oxide not only accelerates the removal of hydrogen chloride (HCl), but also causes instability of the rubber. In the polymer without the higher activity of chlorine, ZnO can only accelerate the speed of HCL removal when heated, (information: the cause of HCL removal is not ZnO itself, but Zn and Cl reaction of ZnCl2, the place of the mechanism of organic chemistry <Halogenated hydrocarbons> chapter, the part of the Lewis acid on the halogenated hydrocarbons). Pentaerythritol alone does not crosslink CSM, and only in the presence of a vulcanizing agent such as TRA can the rate of vulcanization be greatly increased, greatly facilitating the rate of vulcanization, but the scorching properties of some of the
Reinforcement filling system
The difference between CSM rubber and other rubbers is that even without the addition of reinforcing fillers, its vulcanized rubber has a high static vulcanization strength. This is due to the unique properties of the CSM vulcanization structure. The side groups generated during vulcanization are polarized with crosslinking bonds to form particles that function as both vulcanization networks and physical crosslinking points.
Nevertheless, fillers still produce the effect of improving the process properties of the rubber, increasing the heat and abrasion resistance of the vulcanized rubber, and reducing costs. Commonly used reinforcing fillers are carbon black, calcium carbonate, kaolin, diatomaceous earth, silica, talc, etc. Fillers play a role in the extent determined by their particle size, the finer the particles, the better the performance of the resulting vulcanized rubber. Among the inorganic fillers, silica guarantees the highest heat resistance. Diatomaceous earth improves the tear strength of the vulcanized rubber and increases its rigidity and hardness.
To improve the weather resistance of vulcanized rubber, kaolin is preferred and has the following characteristics: good dielectric properties, and does not decrease after moisture absorption, excellent dynamic properties. In light-colored products, it can be effectively filled with barium sulfate and zinc barium white, and titanium dioxide can improve the vividness of the color of vulcanized rubber and weather resistance.
CSM vulcanized rubber containing filler has high chemical stability. Hot cracking carbon black, barite, etc. can make the vulcanized rubber obtain the best hydrochloric acid resistance. For sulfuric acid resistance, the fillers that give the best results are pyrolytic carbon black, kaolin, barite, diatomaceous earth and others. For nitric acid resistance, it is thermal cracking carbon black.
Plasticizing system
Plasticizers are used in CSM rubbers to improve the process properties of the compound, the low-temperature properties of the vulcanized rubber, as well as to improve its elasticity and reduce its hardness. Petroleum-based oils, ointments and ester plasticizers are most commonly used in CSM rubbers. The amount used can be slightly higher than in other rubbers. In vulcanized rubbers that come into contact with chemicals, the amount of plasticizer should be reduced to a minimum.
For rubber to be used at low temperatures, it is best to use ester plasticizers. Such as DOP, DOA, DOS, etc. Chlorinated paraffin is used as a flame retardant in other rubbers, in CSM in addition to flame retardant, it can also improve the tensile strength and improve the retention of elongation after heat aging, and the low-temperature performance is also better. Chlorination degree of about 40% is good, more than 50% chlorinated, flame resistance is improved but low temperature performance deterioration.
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