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With China Plastic Machinery
With China Plastic Machinery
Chlorinated polyethylene is a saturated polymer material with a white powder appearance, non-toxic and odorless, excellent weather resistance, ozone resistance, chemical resistance and aging resistance, good oil resistance, flame retardancy and coloring properties. It has good toughness (still flexible at -30буC), good compatibility with other polymer materials, and a high decomposition temperature.
Chlorinated polyethylene (CPE) is a saturated polymer material with a white powder appearance, non-toxic and odorless, excellent weather resistance, ozone resistance, chemical resistance and aging resistance, decomposition to produce HCL, HCL can catalyze the dechlorination reaction of CPE.
Chlorinated polyethylene is a polymer material made from high-density polyethylene (HDPE) by chlorination substitution reaction. According to different structures and uses, chlorinated polyethylene can be divided into two categories: resin-type chlorinated polyethylene (CPE) and elastomer-type chlorinated polyethylene (CM). In addition to being used alone, thermoplastic resins can also be blended with polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP), polystyrene (PS), ABS and other resins, and even polyurethane (PU). In the rubber industry, CPE can be used as a high-performance, high-quality special rubber, and can also be blended with other rubbers such as ethylene propylene rubber (EPR), butyl rubber (IIR), nitrile rubber (NBR), chlorosulfonated polyethylene (CSM), etc.
In the 1960s, the German Hoechst Company first successfully developed and achieved industrial production. China began to develop chlorinated polyethylene in the late 1970s. The first successful development was by the Anhui Provincial Chemical Research Institute, which successfully developed the "water phase suspension synthesis CPE technology", and successively built production units of 500 to 1000 t/a in Wuhu, Anhui, Taicang, Jiangsu, and Weifang, Shandong.
CPE has average oil resistance, among which it has excellent resistance to ASTM No. 1 oil and ASTM No. 2 oil, which is comparable to NBR; it has excellent resistance to ASTM No. 3 oil, which is better than CR and comparable to CSM.
CPE contains chlorine, has excellent flame retardant properties, and has anti-drip characteristics. It can be matched with antimony flame retardants, chlorinated paraffin, and Al(OH)3 in appropriate proportions to obtain flame retardant materials with excellent flame retardant properties and low cost.
CPE is non-toxic, does not contain heavy metals and PAHS, and fully meets environmental protection requirements.
CPE has high filling performance and can be made into products that meet various performance requirements. CPE has good processing performance, and a variety of grades are available with Mooney viscosity (ML121 1+4) between 50-100.
In the late 1990s, China's demand for high-performance flame-retardant rubber was growing, especially the development of the wire and cable industry and the automotive parts manufacturing industry, which led to the consumer demand for rubber-type CPE. Rubber-type CPE is a special synthetic rubber with excellent comprehensive performance, heat oxygen ozone aging resistance and good flame retardancy.
Chlorinated polyethylene resin is a new type of synthetic material with a series of excellent properties. It is an excellent impact modifier for PVC plastics and a synthetic rubber with good comprehensive performance. It has a very wide range of applications and has been widely used in cables, wires, hoses, tapes, rubber and plastic products, sealing materials, flame-retardant conveyor belts, waterproof coils, films and various special-shaped products. CPE can also be blended with polypropylene, high and low pressure polyethylene, ABS, etc. to improve the flame retardancy, aging resistance and printing properties of these plastics. CPE can be regarded as a random copolymer of ethylene, polyethylene and 1.2-dichloroethylene. Its molecular chain is saturated and polar chlorine atoms are randomly distributed. Because of its excellent physical and chemical properties, it is widely used in machinery, electricity, chemical industry, building materials and mining industries. CPE is better than most rubbers in heat resistance, ozone resistance, weather resistance and aging resistance, better than nitrile rubber (NBR) and chloroprene rubber (CR), and better than chlorosulfonated vinyl chloride (CSM); it is resistant to corrosion such as acid, alkali and salt, non-toxic, flame retardant and non-explosive.
It is mainly used in: wires and cables (cables for coal mines, wires specified in standards such as UL and VDE), hydraulic hoses, automotive hoses, tapes, rubber sheets, PVC profile pipe modification, magnetic materials, ABS modification, etc.
Keep the storage container sealed, put it in a tight storage container, and store it in a cool and dry place.
1) Reinforcement and Filling System
CPE is a non-self-reinforcing rubber and requires a reinforcement system to achieve good strength. Its reinforcement and filling system is similar to that of general rubber. The reinforcing agent is mainly carbon black and white carbon black. White carbon black can improve the tear resistance of CPE and can form a meta-white system to improve the adhesion between CPE and the skeleton. CPE has high filling properties. The filling system mainly includes calcium carbonate, talcum powder, clay, etc.
2) Plasticizer System
Ester plasticizers and aromatic hydrocarbon plasticizers are the most commonly used plasticizers for CPE, such as dioctyl terephthalate (DOTP), dioctyl adipate (DOA), trioctyl trimellitate, aromatic oil, etc. Their solubility parameters are close to CM and their compatibility is good. Dioctyl phthalate (DOP) has been discontinued due to environmental issues. DOA and DOS can be used in rubber to give the rubber excellent cold resistance. DOS is very suitable for situations where both heat resistance and low temperature resistance are required.
3) Stable protection system
CPE will release hydrogen chloride when heated or vulcanized (non-peroxide vulcanization system), so a stabilizer with acid absorption effect should be used in the formula, such as calcium stearate, barium stearate, tribasic lead sulfate or magnesium oxide.
4) CPE vulcanization system
CPE is a saturated rubber, and the general ordinary sulfur vulcanization system cannot effectively vulcanize it.
The vulcanization system is divided into four major vulcanization systems.
1. Thiourea system, 2. Peroxide system, 3. Thiadiazole system, 4. Triazole dimercaptoamine salt system.
1. The earliest application of CPE vulcanization system is thiourea system, among which Na-22 is the most effective. However, Na-22 has a slow vulcanization speed, poor aging performance, and high compression permanent deformation. Moreover, Na-22 is a serious carcinogen and produces an unpleasant odor during vulcanization. Its use has been restricted abroad.
2. At present, the most mature application of CM vulcanization system is peroxide vulcanization system, which has a fast vulcanization speed, good product physical properties, and small compression permanent deformation. Peroxide system can be used in the production of tapes, and the products have good physical properties, heat resistance and oil resistance. When this system is combined, adding auxiliary crosslinking agents such as TAIC, TAC, TMPTM, and HVA-2 can significantly improve its physical and mechanical properties and heat resistance. Since peroxide is a free radical reaction to produce crosslinking, some acidic fillers will affect the generation of free radicals, so this type of filler should not be used. However, peroxide is not suitable for moldless vulcanization under low pressure, and has high process requirements, making it difficult to apply in most rubber product processes.
3. EataMixTCHC is a compounded CPE special vulcanizing agent, which is non-toxic. TCHC can use cheap aromatic oil as a plasticizer, and the vulcanized rubber has excellent performance. The activity of MgO has little effect on the physical properties and aging properties of TCHC system vulcanized rubber. Ultrafine Mg(OH)2 as an acid absorber is equivalent to high-activity magnesium oxide with an iodine absorption value of 150, which can replace the expensive imported high-activity magnesium oxide, greatly reducing the manufacturing cost.
The application cost is much lower than that of foreign thiadiazole systems, and it can be applied to various vulcanization processes, including low temperature, mold-free, pressure-free and low-pressure vulcanization. This system has a faster vulcanization speed, excellent physical properties of the vulcanized rubber, low compression permanent deformation, good resistance to thermal oxygen, ozone aging, and oil resistance. It is also an effective co-crosslinking system for CPE and diene rubber, and has been successfully used in the hose industry. The vulcanization speed of TCHC is slower than that of peroxide, but it can be vulcanized at a lower temperature, pressure-free and mold-free conditions, and the vulcanized rubber has excellent performance.
The thiadiazole system is mainly composed of a crosslinker and an accelerator. The main crosslinkers are ECHO.A, ECHO., TDD, PT75, and TDDS. The main accelerators are Vanax 808, EataAccelDH, NC, Accel 903, and BF. It is a class of additives with great development prospects.
Fourth, triazole dimercaptoamine salt system.
The triazole dimercaptoamine salt vulcanizer is a single substance that integrates the effective groups of the thiadiazole vulcanizer and the accelerator (n-butyraldehyde and aniline condensate), which overcomes the irregular distribution of bonds after the crosslinking of thiadiazole and the accelerator to the rubber, making the rubber crosslinked body a stable structure. Compared with the thiadiazole system, the salt also changes the pH value of the system due to the introduction of special groups, from strong acid to neutral, changing the adverse effects of acidic fillers on the system, making the rubber more chemically active when crosslinked. Therefore, the CPE rubber crosslinked by this system has a qualitative improvement in physical or chemical properties. It can use aromatic oil, magnesium oxide and magnesium hydroxide as raw materials, and is suitable for low-temperature, pressureless and low-pressure vulcanization process conditions. It has a fast vulcanization speed, which is faster than thiadiazole, and requires a small amount of addition (2 parts). It has a favorable unit price, does not decompose within the vulcanization temperature, does not produce odor, and is environmentally friendly and non-toxic.
Representative products are: vulcanizing agent FSH, crosslinking agent TEHC.
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