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イソプレン

イソプレン 化学構造式
78-79-5
  • CAS番号.78-79-5
  • 化学名:イソプレン
  • 别名:イソプレン;2-メチルブタン-1,3-ジエン;3-メチル-1,3-ブタジエン;2-メチル-1,3-ブタジエン;2-メチルー1,3-ブタジエン;2メチル1,3ブタジエン;イソブレン,2-メチル-1,3-ブタジエン
  • 英語化学名:Isoprene
  • 英語别名:nsc9237;ISOPRENE;lsoprene;FEMA 3900;Vita-crop;decyclo-C5;Isopentadiene;BUFFER PH7.20;Isoprene ACETATE BUFFER
  • CBNumber:CB8854379
  • Molecular Formula:C5H8
  • Formula Weight:68.12
  • MOL File:78-79-5.mol
イソプレン 物理性質
  • 融点  :323-329 °C(lit.)
  • 沸点  :34 °C(lit.)
  • 比重(密度)  :0.681 g/mL at 25 °C(lit.)
  • 蒸気密度 :2.35 (vs air)
  • 蒸気圧 :8.82 psi ( 20 °C)
  • 屈折率  :n20/D 1.422(lit.)
  • 闪点  :−65 °F
  • 貯蔵温度  :Store at <= 20°C.
  • 溶解性 :0.7g/l
  • 外見  :solid
  • 酸解離定数(Pka) :>14 (Schwarzenbach et al., 1993)
  • 色 :Clear colorless to very pale yellow
  • 臭い (Odor) :petroleum-like odor
  • 臭気閾値(Odor Threshold) :0.048ppm
  • 爆発限界(explosive limit) :1-9.7%(V)
  • 水溶解度  :0.07 g/100 mL
  • 凝固点  :-145.96℃
  • 極大吸収波長 (λmax) :231nm(neat)(lit.)
  • Merck  :14,5201
  • BRN  :969158
  • Henry's Law Constant :(x 10-2 atm?m3/mol): 3.45 at 18 °C (dynamic stripping cell-MS, Karl et al., 2003)
  • 安定性: :Stability Extremely flammable. Readily forms explosive mixtures with air. Note low flash point, low boiling point, high vapour pressure. Unstable - prone to spontaneous polymerization. May contain a polymerization inhibitor. Incompatible with strong oxidizing agents.
  • CAS データベース :78-79-5(CAS DataBase Reference)
  • NISTの化学物質情報 :1,3-Butadiene, 2-methyl-(78-79-5)
  • IARC :2B (Vol. 60, 71) 1999
  • EPAの化学物質情報 :Isoprene (78-79-5)
安全性情報
  • 主な危険性  :F+,T,N
  • Rフレーズ  :45-12-52/53-68-51/53
  • Sフレーズ  :53-45-61-36/37-16
  • RIDADR  :UN 1218 3/PG 1
  • WGK Germany  :1
  • RTECS 番号 :NT4037000
  • 自然発火温度 :428 °F
  • TSCA  :Yes
  • HSコード  :2901 24 00
  • 国連危険物分類  :3
  • 容器等級  :I
  • 有毒物質データの :78-79-5(Hazardous Substances Data)
  • 毒性 :LD50 for mice: 144 mg isoprene vapors/l air (Gostinskii)
危険有害性情報のコード(GHS)
  • 絵表示(GHS)
  • 注意喚起語Danger
  • 危険有害性情報
  • H224:極めて引火性の高い液体および蒸気
  • H341:遺伝性疾患のおそれの疑い
  • H350:発がんのおそれ
  • H411:長期的影響により水生生物に毒性
  • H412:長期的影響により水生生物に有害
  • 注意書き
  • P201:使用前に取扱説明書を入手すること。
  • P210:熱/火花/裸火/高温のもののような着火源から遠ざ けること。-禁煙。
  • P280:保護手袋/保護衣/保護眼鏡/保護面を着用するこ と。
  • P303+P361+P353:皮膚(または髪)に付着した場合:直ちに汚染された衣 類をすべて脱ぐこと/取り除くこと。皮膚を流水/シャワー で洗うこと。
  • P308+P313:暴露または暴露の懸念がある場合:医師の診断/手当てを 受けること。
  • P370+P378:火災の場合:消火に...を使用すること。
  • P403+P235:換気の良い場所で保管すること。涼しいところに 置くこと。
  • P405:施錠して保管すること。
イソプレン 価格 もっと(17)
  • メーカー: 富士フイルム和光純薬株式会社(wako)
  • 製品番号: W01W0109-0116
  • 製品説明 : イソプレン
  • 純度: Isoprene95.0+% (Capillary GC)
  • 包装: 25mL
  • 価格: ¥2450
  • 更新時間: 2021/03/23
  • 購入: 購入
  • メーカー: 富士フイルム和光純薬株式会社(wako)
  • 製品番号: W01CHDASB-00009473
  • 製品説明 : イソプレン
  • 純度: Isoprene
  • 包装: 1mL
  • 価格: ¥3400
  • 更新時間: 2018/12/26
  • 購入: 購入
  • メーカー: 東京化成工業
  • 製品番号: I0160
  • 製品説明 : イソプレン
  • 純度: Isoprene (stabilized with TBC) >99.0%(GC)
  • 包装: 25mL
  • 価格: ¥2000
  • 更新時間: 2021/03/23
  • 購入: 購入
  • メーカー: 東京化成工業
  • 製品番号: I0160
  • 製品説明 : イソプレン
  • 純度: Isoprene (stabilized with TBC) >99.0%(GC)
  • 包装: 500mL
  • 価格: ¥4500
  • 更新時間: 2021/03/23
  • 購入: 購入
  • メーカー: 関東化学株式会社(KANTO)
  • 製品番号: 20079-31
  • 製品説明 : イソプレン
  • 純度: Isoprene>98.0%(GC)
  • 包装: 25mL
  • 価格: ¥2000
  • 更新時間: 2021/03/23
  • 購入: 購入

Isoprene 化学特性,用途語,生産方法

  • 外観 無色~わずかにうすい黄色, 澄明の液体
  • 溶解性 水に微溶 (440mg/L), アルコール, エーテルに易溶。エタノール及びアセトンに極めて溶けやすく、水にほとんど溶けない。
  • 解説

    C5H8(68.12).CH2=CH(CH3)C=CH2.2-メチル-1,3-ブタジエン(2-methyl-1,3-butadiene)ともいう.脂肪族不飽和炭化水素(ジエン)の一つ.分枝メチル基と共役二重結合とをもっている.天然ゴムの構成単位であり,石油系炭化水素の分解ガス中にも含まれる.製法は,天然ゴム,テレビン油などを熱分解して得られる.工業的には,石油系炭化水素の熱分解により,エテンを製造する際に副生する C5 留分から,抽出蒸留により分離する方法,イソペンテンを脱水素する方法,イソブテンとホルムアルデヒドを脱水縮合する方法などがある.構造はブタジエンの内部炭素に結合している水素の一つをメチル基で置換した構造をもつ.無色のやや刺激臭のある揮発性の液体.融点-145.95 ℃,沸点34.07 ℃.d2540.67587.n25D1.41852.各種有機溶剤に可溶,水に不溶.共役ジエンとしてブタジエンと同様の化学反応性を示し,石油化学工業における重要な炭化水素中間体の一つ.おもな用途はイソプレンゴム(cis-1,4-ポリイソプレン),ブチルゴムなどの合成ゴム原料,およびファインケミカル用合成原料である.[CAS 78-79-5]

    森北出版「化学辞典(第2版)

  • 用途 イソプレンゴム、ブチルゴム等のゴム類合成のための中間原料
  • 使用上の注意 アルゴン封入
  • 説明 Isoprene is a naturally occurring clear colorless volatile liquid (at room temperature) with a faint odor. Isoprene is an important building block for lipids, steroids, terpenoids, and a wide variety of natural products, including natural rubber. Isoprene is found in abundance in nature and is produced and emitted to the environment by plants and trees; it is also emitted from food crops since isoprene serves as the basic structural unit of numerous substances such as terpenes and vitamins A and K. Hence, isoprene is found in ambient air at low concentrations (e.g., the reported concentration of isoprene in the ambient air of the United States ranges between 1 and 21 ppb and is generally less than 10 ppb). Because the biosynthesis of isoprene is associated with photosynthesis, emission of isoprene from plants and trees is negligible at night. Emission of isoprene from plants and trees is also seasonal with the highest emission occurring in the summer and the lowest emission occurring in the winter. Once emitted to the atmosphere, isoprene is converted by free radicals (e.g., nitric oxide, hydroxyl radicals, ozone) to various species (e.g., aldehydes, hydroperoxides, organic nitrates, epoxides) that mix with water droplets and help create aerosols and haze.
    Isoprene is produced endogenously in experimental animals and humans. The rate of endogenous production of isoprene in rats and mice is approximately 1.9 and 0.4 mmol kg-1 h-1, respectively, while in humans it is approximately 0.15 mmol kg-1 h-1 (approximately 2–4 μmol kg-1 per day). The precursor to endogenous isoprene production in humans is believed to be mevalonic acid, a precursor of cholesterol synthesis. Isoprene is the major hydrocarbon found in human breath, accounting for up to 70% of exhaled hydrocarbons. The mean concentration of isoprene reported in human breath is 118 ppb (range 0–474 ppb). The concentration of isoprene in human blood is between 1 and 4.8 μg l-1. The rate of production of isoprene is higher in males than females and in adults than in children.
    Anthropogenic sources of isoprene include production of ethylene by cracking naphtha, wood pulping, combustion of wood and other biomass, tobacco smoke (smoking one cigarette can increase the concentration of isoprene in exhaled air by 70%), gasoline, and automobile exhaust.
  • 化学的特性 Isoprene (2-methyl-l,3-butadiene) is a colorless, volatile, flammable liquid with specific gravity 0.6758. It is highly reactive, usually occurs as its dimer, and unless inhibited undergoes explosive polymerization. Isoprene naturally occurs in the environment as emissions from vegetation. It may be released to the environment as emissions during wood pulping, biomass combustion, and rubber abrasion; through tobacco smoke, gasoline, turbine, and automobile exhaust. In tobacco smoke, isoprene has been determined to be the precursor of a number of polycyclic aromatics, as demonstrated by thermal condensations in the range of 450–700℃.
  • 物理的性質 Colorless, volatile, extremely flammable liquid with an petroleum-like odor. An odor threshold concentration of 48 ppbV was reported by Nagata and Takeuchi (1990).
  • 使用 The primary use of isoprene is the manufacture of polyisoprene, or ‘synthetic’ natural rubber, which is subsequently used to make tires. Other major uses of isoprene include the production of styrenic thermoplastic elastomer block copolymers (styrene–isoprene–styrene) and butyl rubber (isobutene– isoprene copolymer). Isoprene is also used to manufacture other chemicals, intermediates, and derivatives, which are subsequently used to manufacture vitamins, pharmaceuticals, flavorings and fragrances, and epoxy hardeners.
  • 使用 The majority of isoprene produced commercially is used to make synthetic rubber (cis-polyisoprene), most of which is used to produce vehicle tires. The second- and third-largest uses are in the production of styrene-isoprene-styrene block polymers and butyl rubber (isobutene-isoprene copolymer) (IARC 1994).
  • 使用 Isoprene occurs in nature and it is produced by many plants. Its polymers are the main component of natural rubber. The most important application of isoprene is to manufacture polymers and copolymers. Polyisoprene, a synthetic rubber made from isoprene, is used in a wide variety of rubber applications including medical equipment, baby bottle teats/nipples, toys, shoe soles, tires, elastic films, threads for golf balls or textiles, adhesives, paints, and coatings. Copolymer butyl rubber, made from isobutene with a small amount of isoprene, has excellent impermeability to gases and is used in inner tubes. Another copolymer styrene-isoprene rubber is used in pressure sensitive adhesives. Isoprene is also used as a chemical intermediate.
  • 定義 ChEBI: A hemiterpene with the formula CH22C(CH3)CH2CH2; the monomer of natural rubber and a common structure motif to the isoprenoids, a large class of other naturally occurr ng compounds.
  • 調製方法 Rubber results from the polymerization of isoprene to form polyisoprene. The resultingstructure dictates the properties of the rubber. Natural rubber has a cis 1,4 structure.This means that the carbon atoms that form the chainattach to the same side ofthe chain at the 1 and 4 positions. The cisstructure gives rubber its elasticity. Polyisoprene alsoexists in a trans 1,3 configuration. In the trans configuration, the addition takes place onopposite sides of the carbon chain.
    Natural rubber occurs in a colloidal milky suspension called latex, which is obtained fromnumerous plants. The most important of these is the para rubber tree, Hevea brasiliensis. Naturalrubber is harvested by cutting a v-shape incision into a plant and allowing latex to drain intoa container containing a preservative. About 50mL of latex is obtained on a daily basis. Latexis transported to collection stations where it is processed for shipment. Processing can includepreservation, coagulation, and concentrating before being sent to rubber factories.
  • 一般的な説明 A clear colorless liquid with a petroleum-like odor. Density 5.7 lb / gal. Flash point -65°F. Boiling point 93°F. May polymerize exothermically if heated or contaminated. If polymerization takes place inside a closed container, the container may rupture violently. Less dense than water and insoluble in water. Vapors heavier than air.
  • 空気と水の反応 Highly flammable. Insoluble in water.
  • 反応プロフィール ISOPRENE may react vigorously with strong oxidizing agents. May react exothemically with reducing agents to release hydrogen gas. May undergo exothermic addition polymerization in the presence of various catalysts (such as acids) or initiators. Undergoes autoxidation upon exposure to the air to form explosive peroxides. Mixing isoprene in equal molar portions with any of the following substances in a closed container caused the temperature and pressure to increase: chlorosulfonic acid, nitric acid (70%), oleum, sulfuric acid (90%) [NFPA 1991].
  • 危険性 Highly flammable, dangerous fire and explosion risk. Irritant. Possible carcinogen.
  • 健康ハザード Vapor produces no effects other than slight irritation of the eyes and upper respiratory tract. Liquid may irritate eyes; like gasoline.
  • Carcinogenicity Isoprene is reasonably anticipated to be a human carcinogen based on sufficient evidence of carcinogenicity from studies in experimental animals.
  • 環境運命予測 At 25 ℃, isoprene has a high vapor pressure of 733 hPa, a low water solubility of 642 mg l-1, and a Henry’s law constant of 7781 Pam3 mol-1. Isoprene’s log Kow is 2.42 while its log Koc is 1.83. Isoprene’s vapor density relative to air is 2.4. Because of its high vapor pressure at ambient temperature, isoprene will partition largely into the atmosphere, with negligible amounts partitioning to soil and water. Due to a short half-life in air (0.5 h by reaction with nitric oxide, 1.2–4 h by reaction with hydroxyl radicals, and 19 h by reaction with ozone), wet deposition of isoprene from air is not expected to play a significant role in its atmospheric fate. Although laboratory testing demonstrates that isoprene has the potential to biodegrade, microbial metabolism is unlikely to contribute significantly to the removal of isoprene from the environment due to rapid volatilization from terrestrial and aquatic media. Isoprene has a low bioaccumulation potential and is not expected to bioaccumulate.
  • 純化方法 Reflux it with sodium then distil it from sodium or NaBH4 under nitrogen, and pass it through a column containing KOH, CaSO4 and silica gel. tert-Butylcatechol (0.02% w/w) is added, and the isoprene is stored in this way until redistilled before use. The inhibitor (tert-butylcatechol) in isoprene can be removed by several washings with dilute NaOH and water. The isoprene is then dried over CaH2, distilled under nitrogen at atmospheric pressure, and the fraction distilling at 32o is collected. Store it under nitrogen at -15o. [Beilstein 1 H 252, 1 IV 1001.]
  • Toxicity evaluation The acute effects of isoprene are related to irritation, central nervous system depression, and asphyxia at high concentrations. The mutagenic and genotoxic effects of isoprene seen in in vivo and in vitro studies, as well as the carcinogenic effects of isoprene in experimental animals (principally mice), are believed to be due to the formation of isoprene diepoxide.
イソプレン 上流と下流の製品情報
原材料
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イソプレン 生産企業
Global(192)Suppliers
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78-79-5, イソプレン キーワード:
  • 78-79-5
  • SODIUM ACETATE ACETIC ACID
  • SODIUM ACETATE ACETIC ACID BUFFER
  • SODIUM ACETATE BUFFER
  • 2-METHYL-BUTA-1,3-DIENE
  • 2-METHYL-1,3-HEXADIENE
  • 2-METHYL-1,3-BUTADIENE
  • ACETATE BUFFER
  • ACETATE BUFFER, PH 4.5
  • ACETATE BUFFER, PH 6.0
  • ACETATE BUFFER REAGENT
  • ACETATE BUFFER SOLUTION R-455
  • ACETATE BUFFER SOLUTION TYPE 'C'
  • ACETATE BUFFER TS
  • ACETIC ACID - SODIUM ACETATE
  • 3-methyl-1,3-butadiene
  • beta-Methylbivinyl
  • CH2=C(CH3)CH=CH2
  • Isopentadiene
  • isopentadiene(isoprene)
  • isoprene,inhibited
  • nsc9237
  • BUFFER ACETATE
  • BUFFER ACETATE, PH 4.00
  • BUFFER SOLUTION
  • ISOPRENE
  • FEMA 3900
  • Isoprene (99%+)
  • Vita-crop
  • 2-METHYL-1 3-BUTADIENE STABILIZED
  • ISOPRENE, STAB.
  • イソプレン
  • 2-メチルブタン-1,3-ジエン
  • 3-メチル-1,3-ブタジエン
  • 2-メチル-1,3-ブタジエン
  • 2-メチルー1,3-ブタジエン
  • 2メチル1,3ブタジエン
  • イソブレン,2-メチル-1,3-ブタジエン