天然橡胶

天然橡胶（CAS 9006-04-6）：分子式 C5H8、分子量 68.12。

产品概览

应用领域

登记用途：Uses: Used as a monomer to manufacture polyisoprene and butyl rubber、[HSDB]、Almost all isoprene produced is used for the preparation of polymers or copolymers. cis-Polyisoprene is the largest application with SIS block polymers a secondary application、and butyl rubber is a significant third application.、Smaller amounts are used as an intermediate into specialty chemicals、including vitamins、pharmaceuticals、flavorings、and perfumes、and epoxy hardeners.、Most of the isoprene that is produced is utilized for the synthesis of poly(cis-1、4-isoprene) (isoprene rubber、IR)、a material (particularly the titanium type) that closely resembles natural rubber in both structure and properties. This IR is largely used for the production of vehicle tires. ... The second largest market for isoprene is the manufacture of styrene - isoprene - styrene (SIS) block copolymers ... These products are especially useful as thermoplastic rubbers and as pressure-sensitive or thermosetting adhesives. ... Smaller amounts of isoprene are used in the production of butyl rubber (isobutene - isoprene rubber、IIR)、a copolymerizate with isobutene.、Manufacture of "synthetic" natural rubber、butyl rubber. Copolymer in the production of synthetic elastomers.、For more Uses (Complete) data for Isoprene (6 total)、please visit the HSDB record page.、Some of the many uses in which rubbers are employed include pneumatic tires and inner tubes、tubing and hose、rubber footware、inflatable and sectional seals、elastic thread and tape、rubber、metal bonded products、inflatable life-rafts and dinghies、chemically resistant tank linings、conveyor belting、foam cushioning for upholstery and bedding、floor coverings、proofed material for clothing、adhesives and solutions、washers、gaskets、diaphrams、floating bulk liquid containers and hose、tennis、squash and golf balls.、In the raw state、rubber has limited application other than being dissolved in solvent for use as adhesives and solutions.、Commercially successful、in production of、elastomeric fibers.、Cements、adhesives、electrical insulating tapes and cable wrapping.、Crude (unvulcanized)、For more Uses (Complete) data for NATURAL RUBBER (7 total)、Industry Uses: Monomers、Processing aids not otherwise specified、Lubricating agent、Other、Intermediate、Not Known or Reasonably Ascertainable、Consumer Uses: Intermediate、Monomers、Household Products: Cosmetics product ingredient: Isoprene、Reason for Listing:、- Classified by the European Union as a carcinogen Categories 1B in Annex VI to Regulation (EC) 1272、2008、- Known to cause cancer and listed under Health and Safety Code section 25249.8 of the California Safe Drinking Water and Toxic Enforcement Act of 1986 (Prop 65)、- Group 2B carcinogens identified by the International Agency for Research on Cancer、- Identified as “known to be” or “reasonably anticipated to be” a human carcinogen in the 13th Report on Carcinogens、United States Department of Health and Human Services、Public Health Service、National Toxicology Program、Potential Health Impacts: Carcinogenicity、Product count: 1、Information on 7 consumer products that contain Rubber、natural in the following categories is provided:、• Auto Products、• Pesticides、• Pet Care、Methods of Manufacturing: The principal route for production of isoprene monomer outside of Russia is recovery from ethylene by-product streams. This route is most viable where ethylene is produced from naphtha or gas oil and where several ethylene plants are located in relatively close proximity to the isoprene plant. Although the yield of isoprene per mass of ethylene is quite low、there is enough ethylene produced to provide a large portion of demand. Because of the presence of n-pentane in these streams which azeotropes with isoprene、extractive distillation must be used to recover pure isoprene. Acetonitrile is the most common solvent、but dimethylformamide is also used commercially.、The synthesis of isoprene from propylene is a three-step process. The propylene is dimerized to 2-methyl-1-pentene、which is then isomerized to 2-methyl-2-pentene in the vapor phase over silica alumina catalyst. The last step is the pyrolysis of 2-methyl-2-pentene in a cracking furnace in the presence of、(NH4)2-S、. Isoprene is recovered from the resulting mixture by conventional distillation.、The starting material here is a fraction which is cut from catalytic cracking of petroleum. Two of the tertiary amylene isomers、2-methyl-1-butene and 2-methyl-2-butene、are recovered in high purity by formation of methyl tertiary butyl ether and cracking of this to produce primarily 2-methyl-2-butene. The amylenes are mixed with steam and dehydrogenated over a catalyst. The crude isoprene can be purified by conventional or extractive distillation.、Isobutylene is condensed with formaldehyde at 95 °C to give the principal product 4、4-dimethyl-m-dioxane. In the second step、the dioxane is decomposed in the presence of an acid catalyst to isoprene、formaldehyde、and water.、For more Methods of Manufacturing (Complete) data for Isoprene (9 total)、Derivation: From latex obtained from Hevea trees、coagulated with acetic or formic acid. Also made synthetically.、Most rubber is sold raw or uncured in dry solid or liquid latex state. The basic steps in the manufacture of some types of dry synthetic rubber are polymerization、coagulation、washing、and drying. With a latex、the basic steps are polymerization、stabilization and usually、concentration. Latex can be defined as a stable aqueous dispersion containing discrete polymer particles about 0.05 to 5 um in diameter.、Impurities: Impurities in isoprene specified for the preparation of high cis-polyisoprene include: isoprene dimer、0.1 wt% (max)、alpha olefins、1 wt% (max)、beta olefins、2.8 wt% (max)、acetylenes、50。

技术档案

这个产品是什么

天然橡胶 是一种化工化合物，登记 CAS 号为 9006-04-6，分子式 C5H8（分子量 68.12）。

识别信息

登记 CAS 号：9006-04-6

其分子式 C5H8 由 5 个碳、8 个氢 组成。

别名/同义词：天然橡胶 · NATURAL RUBBER · Rubber

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PubChem 公开数据

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