StructuralcharacteristicsandapplicationofchlorinatedpolyethyleneCPE

Recently, cpe is used, so summarize the relevant knowledge of cpe according to the introduction of the literature, as follows:

1. Chlorinated polyethylene, full English name chlorinated polyethylene, abbreviated cpe. Chlorinated polyethylene cpe is a material obtained by replacing a hydrogen atom part of a high density polyethylene hdpe with a chlorine atom. cpe is white powder, non-toxic and tasteless.

2. Chlorinated polyethylene made with low-pressure polyethylene hdpe has better resistance to high temperature heat aging than chlorinated polyethylene made with high-pressure polyethylene. Generally, polyethylene with a density of 0.93 to 0.96 g / cm3, an average molecular weight of 50,000 to 250,000, and a melt index between 0.01 to 2.0 g / 10min is used to make chlorinated polyethylene. The degree of chlorination of chlorinated polyethylene greatly affects its performance. When the chlorine content is less than 15%, it is plastic; when the chlorine content is 16-24%, it is a thermoplastic elastomer; when the chlorine content is 25-48%, it is a rubber-like elastomer; when the chlorine content is 49-58%, it is leather-like. Semi-elastic hard polymer; brittle resin with chlorine content up to 73%. When about 27% of chlorine is introduced into high-pressure polyethylene, the crystals completely disappear, and when about 30% of chlorine is introduced into low-pressure polyethylene with high crystallinity, the crystals will completely disappear. As a rubber elastomer, the content of chlorine is preferably in the range of 30 to 40%. At present, the chlorine content of commercial chlorinated polyethylene rubber is mostly in the range of 25 to 45%. Generally, when the chlorine content is increased, the oil resistance, breathability and flame retardancy are improved; when the chlorine content is decreased, the cold resistance, resilience and compression bending resistance are better.

2, characteristics of chlorinated polyethylene cpe

1) cpe is a kind of saturated rubber, which has excellent heat-resistant oxygen aging, ozone aging, acid and alkali resistance, chemical properties.

2) cpe has excellent oil resistance, among which astm 1 and ast 2 oils have excellent performance, which is equivalent to nbr; astm 3 oil has excellent performance, is superior to cr, and is equivalent to csm.

3) cpe contains chlorine element, has excellent flame retardancy, and has anti-flammability properties. It can be combined with antimony-based flame retardant, chlorinated paraffin, and al (oh) 3 in an appropriate ratio to obtain a flame retardant material with excellent flame retardancy and low cost.

4) cpe is non-toxic, does not contain heavy metals and pahs, it fully meets environmental protection requirements.

5) cpe has high filling performance and can be made into products that meet various performance requirements. CPE has good processing performance. Mooney viscosity (ml121 1 + 4) is available in various grades between 50-100.

3. Chlorinated polyethylene can be divided into resin-type chlorinated polyethylene (cpe) and elastomer-type chlorinated polyethylene (cm). In addition to being used alone, it can also be blended with resins such as polyvinyl chloride (pvc), polyethylene (pe), polypropylene (pp), polystyrene (ps), abs, and even polyurethane (pu). In the rubber industry, cpe can be used as a high-performance, high-quality special rubber, and can also be used with ethylene-propylene rubber (epr), butyl rubber (iir), nitrile rubber (nbr), chlorosulfonated polyethylene (csm), etc. Other rubber blends. Mainly used in: wires and cables (cables for coal mines, wires specified in ul and vde standards), hydraulic hoses, automotive hoses, tapes, rubber sheets, pvc profile pipe modification, magnetic materials, abs modification, etc.

4. CPE enhancers are mainly carbon black and white carbon black; filling systems are mainly calcium carbonate, clay and talc; etc .; plasticizers are mainly doa and dos; stabilizers commonly used during cpe curing are mainly sodium stearate , Magnesium oxide, barium stearate, and tribasic lead sulfate, etc., mainly absorb hydrogen chloride produced during sulfurization.

5, cpe is a saturated rubber, the general ordinary sulfur vulcanization system can not effectively vulcanize it. The vulcanization system is divided into four major vulcanization systems: thiourea system, peroxy system, thiadiazole system, and triazole dimercaptoamine salt system.