However, it is now so popular that it has become common name for all chloroprene rubber sheets. Properties with values for just one material 3, in this case are not shown. Rubber material selection guide cr or neoprene polychloroprene. Vulcanized composites of chloroprene rubber cr with cellulose ii cel ii as a filler were investigated.
Vulcanization is explaind more deeply on the vert modules rubber chemistry and raw materials and compounds in rubber industry. A comparison of the properties of 8 kinds of rubber are shown in the follow table. Cr rubber is a thermoset elastomer or rubber material. The only commercial use identified for chloroprene is as a monomer in the production of the elastomer polychloroprene neoprene, a synthetic rubber used in the production of automotive and mechanical rubber goods, adhesives, caulks, flameresistant cushioning, construction materials, fabric coatings, fiber binding, and footwear. Usually the blending of epdm rubber with other rubber have given the com pounds with good physical properties 112. Chloroprene rubber cr possesses the following properties. It exhibits good uv and ozone stability and has good chemical resistance to oil, fuel, and many other chemicals.
In such a way qspr can help in a faster and more parsimonious design of new chloroprene rubber curative molecules. Chloroprene rubber an overview sciencedirect topics. Neoprene is sold either as solid rubber or in latex form and is used in a wide variety of applications, such as laptop sleeves, orthopaedic braces wrist, knee, etc. Regression mathematical models were calibrated on two rheological properties scorch time and optimum cure time and three mechanical properties modulus 100%, hardness, and elongation at break. Neoprene also polychloroprene or pc rubber is a family of synthetic rubbers that are produced by polymerization of chloroprene. This colorless liquid is the monomer in the production of the polymer polychloroprene, a type of synthetic rubber. Paper open access tensile and oil resistance properties of. Chloroprene rubber cr is representative of rubber type 64. Polychloroprene different types of chloroprene rubber cr. Chloroprene rubber cr is a synthetic rubber that is also known by the trade name neoprene. Jul 02, 2003 polychloroprene or chloroprene rubber comes in a number of different grades such as general purpose, precrosslinked, sulfur modified and slow crystallizing. This paper discusses the curing and properties of chloroprene and butadiene rubber crbr blends crosslinked with copperi oxide cu2o or copperii oxide cuo.
Polymers are long molecular chains and are derived from the greek poly many and meros parts. Recent data from two chloroprene polymerization plants in the united states with. The graph bars on the material properties cards below compare cr rubber to other rubber materials top and the entire database bottom. Polychloroprene cr, also known as neoprene or chlor caoutchouc, is the fourth largest volume diene elastomer. Pdf curing and properties of chloroprene and butadiene rubber. It has better chemical, oil, ozone and heat resistance than natural rubber but a rather lower level of physical properties. Although the term rubber is used rather loosely, it usually refers to the compounded and vulcanized.
Cure characteristics, mechanical and swelling properties. This report presents design cases for the manufacture of chloroprene, a monomer used to produce the elastomer polychloroprene. However, technically all neoprene rubber sheets are chloroprene rubber sheets, but the vice versa is not true. The latest major step in the history of chloroprene rubber took place when the baypren rubber activities were transferred to lanxess. Chloroprene is the common name for 2chlorobuta1,3diene iupac name with the chemical formula ch 2 ccl. Mechanical and dynamical mechanical properties of chloroprene. Chloroprene sheeting is used to produce insulating joints and coatings for protecting environments it has superior mechanical and excellent abrasion properties also without reinforcing.
However, chloroprene tends to harden over time and degrades in the presence of some fairly common chemicals such as hydrochloric acid, acetone, xylene, acetic acid, and hydrogen peroxide. For comparison purposes, carbon black cbcr composites were also studied. A modified vulcanization accelerator obtained by having an inorganic powder impregnated with, or adsorb, a thioglycolic acid ester constitutes a preferred. More excellent low temperature properties of wrt with improved. Schaefer introduction rubber is a unique material that is both elastic and viscous. It can be considered as a good generalpurpose rubber with an excellent balance of physical and chemical properties. Taking advantage of these excellent properties, chloroprene rubber is now used for a wide range of applications. Home main products cr sheet chloroprene rubber synthetic rubber cr sheet chloroprene rubber. Its mechanical properties are generally inferior to those of natural rubber but it has superior chemical resistance. During the process or after it the rubber is vulcanized crosslinked, due to which rubber elasticity and dimensional stability appear.
Oesbr is oil extended styrenebutadiene rubber, lsbr means styrenebutadiene rubber produced by. Pdf this paper discusses the curing and properties of chloroprene and butadiene rubber crbr blends crosslinked with copperi oxide. The present study investigated the effects of two types of natural rubber and different blend ratios on the cure, tensile properties and morphology of natural. Taking advantage of these excellent properties, chloroprene rubber is now used for a. Neoprene also polychloroprene is a family of synthetic rubbers that are produced by polymerization of chloroprene. C typical applications properties m40 medium 48 5 general purpose, cables, belts, hoses, other industrial goods m41 medium 48 5 general purpose, version of m40 with less roll sticking and mold contamination. Among the vulcanized elastomers, the chloroprene rubber dupont neoprene generic name possesses a good performance, being one of. Chloroprene rubber cr chloroprene rubber cr matmatch. Characteristic properties of silicone rubber compounds. Chloroprene rubber cr chloroprene was the first synthetic rubber developed commercially and exhibits generally good ozone, aging and chemical resistance. The effect of blend ratio on properties of chloroprene rubbernatural rubber cr nr blends was investigated. Crude natural rubber is found in the juices of many plants shrubs, vines, and trees, the principal of which is the hevea brasiliensis tree, native to brazil. Polychloroprene or chloroprene rubber comes in a number of different grades such as general purpose, precrosslinked, sulfur modified and slow crystallizing.
Numerous component uses in the transportation field. Examples of the uniaxial compressive response are summarized in figures 11. Chloroprene is a colorless volatile liquid, almost exclusively used as a monomer for the production of the polymer polychloroprene, a type of synthetic rubber. Chloroprene chemical production and investment cost. When used in liners, seals and gaskets, neoprene brings plenty of chemical and physical properties to the table. Neoprene is sold either as solid rubber or in latex form and is used in a wide variety of applications, such as. One of the earliest of the synthetic materials to be developed as an oilresistant substitute for natural rubber, neoprene is a homopolymer of chloroprene chlorobutadiene. In a russian chloroprene latex manufacturing facility, chloroprene concentrations varied from 1 to 8 mgm3 volkova et al.
Showa denko has been manufacturing polychloroprene in both solid and liquid dispersions for over 50 years with consistent, high quality. The global chloroprene rubber market is expected to witness tremendous growth owing to its increasing demand from rubber industry, raw material for adhesives and for various latex applications. Like natural rubber and other polymers with pronounced. Chloroprene rubber sheets are manufactured by utilizing polychloroprene or chlorobutadiene synthetic rubber.
Increasing mooney viscositymolecular weight increases strength but also compound viscosity. Disclosed is a vulcanization accelerator for chloroprene rubber which has a thioglycolic acid ester as its main component and which gives chloroprene products improved in physical properties, particularly tear strength. Preferred sealing material for refrigeration industry. Chloroprene rubber adhesive cr chloroprene rubber adhesive is a solution type adhesive among widelyused rubber adhesives. Evaluation of physical and electrical properties of chloroprene. Pdf among the vulcanized elastomers, the chloroprene rubber dupont neoprene generic name possesses a good performance, being one of the most.
Cr has a good balance of properties, including good chemical. Also some other letter can create a part of abbreviation, and these closer characterize appropriate rubber, e. One of the first successful synthetic elastomers, neoprene was first prepared in 1931 by arnold collins, a chemist in wallace hume carothers research group at dupont, while he was investigating by. After the latex is processed, natural rubber becomes an elastomer with excellent mechanical properties. Features chloroprene provides exceptional resistance towards alcohol and oil provides tactile and sensitivity of latex gloves without risk of type i skin allergy provides exceptional strength and protection strong. Chloroprene rubber are homopolymers of chloroprene trans 14 configuration that has basic properties such as excellent in fuel resistance and heat aging resistance 16. The data show that properties of chloroprene are superior to those of the other rubbers in general. Maastricht dormagen arlanxeo, one of the worlds leading suppliers of synthetic elastomers, is expanding its global chloroprene rubber cr production at the site in dormagen, germany. It is a detailed product information page of the cr sheet chloroprene rubber. Chloroprene rubber demonstrates a good balance of features, including such as resistance to ozone, oil and heat. Cr is used in different technical areas, mainly in the rubber industry ca. In addition to the mechanical properties, attention. Chloroprene elastomers are rigid, usually soft, but always elastically deformable under load.
In addition, chloroprene rubber is also used in molded goods, cables, conveyor belts and transmission belts which is anticipated to increase market share significantly over the. Pdf curing and properties of chloroprene and butadiene. Showa denko has been manufacturing polychloroprene in both solid and liquid dispersions for over 50 years with consistent, high quality performance and customer satisfaction. Neoprene is a registered trademark for chloroprene rubber produced by dupont company. It is made up of neoprene, magnesium oxide, antiaging agent, antioxidant and filler etc. Functional elastomer providing a good balance of important properties for a wide variety of applications. The production capacity there will be increased to as much as 70,000 tons per year overall that will be. It is a good generalpurpose rubber, but it is limited to special properties applications because of its high cost. It has the lowest heat capacity and a moderately low tensile strength among rubber materials. Cel ii, obtained by the coagulation of cellulose xanthate, was incorporated in the rubber by the traditional method. For each property being compared, the top bar is nbr rubber and the bottom bar is cr rubber. Showa denko chloroprene types selection guide version 18. Polychloroprene chloroprene rubber, cr polychloroprene is the polymer name for the synthetic rubber known as neoprene a proprietary trade name of dupont that has become generic.
Polychloroprene is better known as neoprene, the trade name given by. Bridge bearing pads, antivibration mounts, air suspension, belts, adhesives for. It has good mechanical properties over a wide temperature range. Neoprene rubber can withstand weathering and resists flex cracking. The rubber material was tested at four different strain rates in uniaxial. On the other side chloroprene rubber cr is one of the earliest synthetic rubbers.
Rubber parts can therefore function as shock and vibration isolators andor as dampers. The effect of blend ratio on properties of chloroprene rubbernatural rubber crnr blends was investigated. Polychloroprene is prepared by emulsion polymerization of chloroprene, or 2chlorobutadiene, which is obtained by the chlorination of butadiene or isoprene. A neoprene rubber sheet can be used in applications, such as creating neoprene seals or a neoprene liner. Ep0041742a1 vulcanization accelerator for chloroprene. Acrylonitrile nitrile butadiene rubber nbr, bunan chloroprene rubber cr, neoprene. The vulcanized products of polychloroprene have favourable physical properties and excellent resistance to weathering and ozone. Chloroprene is the common name for the organic compound 2chlorobutanol1, 3diene. Rubber refers to elastomeric compounds that consist of various monomer units forming polymers that are heat cured vulcanized. In 1975, bayer began chloroprene rubber production using a modern system based on its own raw materials when a largescale plant was built at the dormagen site to manufacture chloroprene monomer.
Arlanxeo to expand production capacities for chloroprene. Neoprene exhibits good chemical stability and maintains flexibility over a wide temperature range. Chloroprene rubber market size, share, trends industry. Cr is also known for its excellent abrasion resistance and toughness. Cure characteristics, mechanical and swelling properties of.