Formaldehyde

化学的特性ポリオキシメチレンPOMまたはアセタール樹脂としても知られていますは熱可塑性エンジニアリングプラスチックの一種で優れた機械的強度剛性および摩耗抵抗性を持っていますその化学式は[CH2O]nでメチレン酸素の繰り返し単位から構成されていますPOMはその耐久性と寸法の安定性のため自動車部品電子機器精密機械部品など幅広い用途で使用されています

化学的特性Paraformaldehyde is a polymerized form of formaldehyde (CHO) and is a stable white crystalline powder with the odor of monomeric formaldehyde. Because pure formaldehyde is unstable at ambient conditions, paraformaldehyde is used as a readily-usable form of formaldehyde at use sites. Then,formaldehyde gas is generated during heating. Paraformaldehyde is used for different applications as a source of either gaseousformaldehyde or solution formaldehyde.

化学性质ポリオキシメチレンはその物理的および化学的特性により多くの産業で重宝されていますこの素材は低摩擦高剛性優れた耐化学性を持ち合わせておりさらには水や多くの溶剤に対しても強い耐性を示しますまた40℃から100℃の温度範囲で使用することができるため非常に広い範囲の環境での使用が可能です

解説パラホルムアルデヒド，HO(CH2O)nH．パラホルムともいう．ホルムアルデヒドの直鎖状重合物のこと．一般にホルムアルデヒド水溶液の真空濃縮でつくられる．また，水溶液中に少量の水酸化カリウムを加えることでもつくられる．ホルムアルデヒド臭をもつ白色の固体．融点120～170 ℃．アセトンに不溶，冷水に難溶であるが，微量の酸または塩基の存在下で水に可溶．殺菌，消毒剤のほか，高濃度または安定剤であるメタノールの存在しないホルムアルデヒド水溶液を調製するのに使われる．劇薬．

用途ユピタール（ポリアセタール樹脂）は、エレクトロニクス、ＯＡ、自動車、精密機械等、さまざまな分野用途の多用な要求性能に幅広くお答えするため、豊富な高機能グレードを取り揃えています。

用途酵素抗体を含む免疫組織染色の試料固定用。

用途殺虫、消毒剤、防腐剤

使用Paraformaldehyde is used as a fumigant, a disinfectant and in the manufacture of synthetic resins like melamine resin, phenol resin and polyacetal resin. It is also used in cell culture. It also serves as a fixative in electron microscopy. It is also used in the preparation of formalin fixatives for tissues or cells. To use the chemical as a fixative, it must be converted to the monomer formaldehyde by heating as formaldehyde is the active chemical in fixation.

一般的な説明Paraformaldehyde appears as a white solid with a light pungent odor. A linear polymer of formaldehyde of formula HO(CH2-O)xH where x averages about 30. Soluble in water when x is less than 12; higher polymers are not immediately soluble. Slow dissolution in water proceeds by means of hydrolysis to give fragments of lower x. Flammable, although may take some effort to ignite. Flash point 158 °F. Used in fungicides, bactericides, and in the manufacture of adhesives. A hazard to the environment. Immediate steps should be taken to limit spread to the environment.

製造方法Paraformaldehyde [30525-89-4] was first produced in 1859. This polymer, at first mistakenly called dioxymethylene and trioxymethylene, consists of a mixture of poly(oxymethylene) glycols HO-(CH2O)n-H with n=8-100. The formaldehyde content varies between 90 and 99 % depending on the degree of polymerization n (the remainder is bound or free water). It is an industrially important linear polyoxymethylene.Paraformaldehyde is prepared industrially in continuously operated plants by concentrating aqueous formaldehyde solutions under vacuum conditions. At first, colloidal, waxy gels are obtained, which later become brittle. The use of a fractionating column through which gases were passed dates from about 1925.Paraformaldehyde is currently produced in several steps which are carried out at low pressure and various temperatures. Highly reactive formaldehyde is produced under vacuum conditions starting with solutions that contain 50-100 ppm of formic acid and also 1-15 ppm of metal formates where the metals have an atomic number of 23-30 (e.g., Mn, Co, and Cu). The solutions are processed in thin-layer evaporators and spray dryers.