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| | 2-ブチル-2-エチル-1,3-プロパンジオール 製品概要 |
| | 2-ブチル-2-エチル-1,3-プロパンジオール 物理性質 |
| | 2-ブチル-2-エチル-1,3-プロパンジオール Usage And Synthesis |
| 外観 | 白色～わずかにうすい黄色、結晶～結晶性粉末または塊 | | 定義 | 本品は、次の化学式で表される二価アルコールである。 | | 化粧品の成分用途 | 保湿.湿潤剤 | | 化学的特性 | white crystalline powder | | 使用 | 2-Butyl-2-ethyl-1,3-propanediol was used in the synthesis of polyesters. | | 使用 | Synthesis of lubricants, emulsifying agents,
insect repellents, plastics. | | 主な応用 | 2-Butyl-2-ethyl-1,3-propanediol is an asymmetric hydrophobic diol giving the corresponding polyesters improved flexibility, lower viscosity, solubility and resistance to hydrolysis as compared with neopentyl glycol. It is used to produce polyurethane powder, coil, and can coatings and other stoving enamels. In powder polyester coatings it improves outdoor resistance and leveling due to lower melt viscosity while still retaining acceptable glass transition temperature of at least 50 ℃. 2-Butyl-2-ethyl-1,3-propanediol reduces the crystallinity of polyesters and is used as coglycol in outdoor durable solventborne polyester paints with high clarity and shelf life. BEPD is used in unsaturated polyester gel coats, resulting in very good hydrolytic stability and improved solubility of the polyester in styrene. Acrylic esters of BEPD and its alkoxylates find applications in UV-curable coatings with improved adhesion on substrates with low surface energy. BEPD is used as chain extender in elastomers with higher clarity and in other polyurethane applications. | | 調製方法 | 2-Butyl-2-ethyl-1,3-propanediol (BEPD) is produced either by the salt-free procedure based on aldol addition followed by hydrogenation or by the classical combination of hydroxymethylation catalyzed by alkali hydroxides and Cannizzaro-type disproportionation with formaldehyde. The reaction is very exothermic and rapid and can be controlled by the addition rate of the base catalyst. The raw material, 2-ethylhexanal, is produced from n-butyraldehyde by aldol condensation and selective hydrogenation steps which increases the production cost of BEPD compared to, e.g., neopentyl glycol. The world production of 2-butyl-2-ethyl-1,3-propanediol is estimated at about 10 000 t/a; the producers are Chisso, Kyowa Hakko, and Perstorp. | | 一般的な説明 | 2-Butyl-2-ethyl-1,3-propanediol undergoes bulk polycondensation with diacid monomer (terephthalic acid) to yield poly(ethylene terephthalate) copolymers. |
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