オルトけい酸テトラエチル 化學特性,用途語,生産方法
外観
無色～ほとんど無色, 澄明の液體
溶解性
水に不溶 (分解), エタノール, エーテルに易溶。エタノールに極めて溶けやすく、水にほとんど溶けない。
反応性
酸、水、酸化剤と反応する。徐々に加水分解する。
用途
帯電防止剤、ガラス原料
用途
耐候性及び耐酸性モルタルとセメント、耐火ブロック、耐熱性ペイント、耐薬品性ペイント、中間體、精密鋳造用、塗料用バインダー、サンドモールドバインダー、セラミックス原料。シリカやゾルゲルガラスの原料、球狀シリカ原料
主な用途／役割
シリコーン樹脂の觸媒として使用される。
毒性
急性毒性(経口) ラット LD50値 6270mg/kg
急性毒性(経皮) ウサギ LD50値 6300μL/kg(換算値5859mg/kg)
生態(tài)毒性
藻類の72時間ErC50 > 100 mg/L、 甲殻類 （オオミジンコ）の48時間EC50 > 75 mg/L 、魚類（メダカ）の96時間LC0 = 245 mg/L (いずれもSIDS, 2008)。
使用上の注意
水によって徐々に分解する。
化學的特性
Ethyl silicate is a flammable, colourless liquid with a mild, sweet, alcohol-like odour. Exposure to ethyl silicate can occur through inhalation, ingestion, and eye or skin contact. It is practically insoluble in water, soluble in alcohol, and slightly soluble in benzene.
使用
Tetraethyl Orthosilicate is used in the preparation of antidreflective coatings on silicate glass via silicon dioxide. Crosslinking reagent.
調製方法
Prepared from absolute alcohol and silicon tetrachloride.
一般的な説明
A clear colorless liquid with a faint odor. Flash point 125°F. Less dense than water. Vapors are heavier than air.
空気と水の反応
Flammable. Practically insoluble in water. Reacts slowly with water to form silica and ethyl alcohol [Merck].
反応プロフィール
Tetraethyl orthosilicate reacts exothermically with acids Strong oxidizing acids may cause a reaction that is sufficiently exothermic to ignite the reaction products. May generate with caustic solutions. May generate flammable hydrogen with alkali metals and hydrides.
危険性
Moderate fire risk. Strong irritant to eyes,
nose, throat.
健康ハザード
Exposures to ethyl silicate cause adverse health effects. The symptoms of poisoning include, but are not limited to, irritation of the eye, mucous membrane, respiratory tract, respiratory difficulty, tremor, fatigue, narcosis, nausea, and vomiting. Prolonged periods of skin contact may produce drying, cracking, inflammation, and dermatitis. As observed in laboratory animals, occupational workers exposed to the chemical substance may suffer from liver and kidney damage, CNS depression, and anemia. At concentrations of 3000 ppm, ethyl silicate causes extreme and intolerable irritation of the eyes and mucous membranes; at 1200 ppm, it produces tearing of the eyes; at 700 ppm, it causes mild stinging of the eyes and nose; and at 250 ppm, it produces slight irritation of the eyes and nose.
火災危険
HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames. Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapor explosion hazard indoors, outdoors or in sewers. Runoff to sewer may create fire or explosion hazard. Containers may explode when heated. Many liquids are lighter than water.
安全性プロファイル
Poison by intravenous
route. Moderately toxic by other routes. A
skin,mucous membrane, and severe eye
irritant. Narcotic in high concentrations.
Flammable liquid when exposed to heat or
flame; can react vigorously with oxidzing
materials. When heated to decomposition it
emits acrid smoke and fumes. See also
ESTERS.
職業(yè)ばく露
Ethyl silicate is used as a binder in
production of cases and molds for investment casting of
metals. The next largest application is in corrosion-resistant
coatings; primarily as a binder for zinc dust paints.
Miscellaneous uses include the protection of white-light
bulbs; the preparation of soluble silicas; catalyst preparation and regeneration; and as a crosslinker and intermediate
in the production of silicones
輸送方法
UN1292 Tetraethyl acetate, Hazard Class: 3;
Labels: 3-Flammable liquid.
純化方法
Fractionate it through an 80cm Podbielniak type column (p 11) with a heated jacket and partial take-off head. It is slowly decomposed by H2O-and is soluble in EtOH. It is flammable-it irritates the eyes and mucous membranes. [Sumrell & Ham J Am Chem Soc 78 5573 1956, Bradley et al. J Chem Soc 5020 1952, Beilstein 1 IV 1360.]
不和合性
May form explosive mixture with air.
Strong oxidizers; strong acids; water.
廃棄物の処理
Incineration in admixture
with a more flammable solvent.
予防処置
Occupational workers should avoid contact between ethyl silicate and strong oxidizers, water, mineral acids, and alkalis. Workers should use appropriate personal protective clothing and equipment that must be carefully selected, used, and maintained to be effective in preventing skin contact with ethyl silicate. The selection of the appropriate personal protective equipment (PPE) (e.g., gloves, sleeves, encapsulating suits) should be based on the extent of the worker’s potential exposure to ethyl silicate. There are no published reports on the resistance of various materials to permeation by ethyl silicate.
オルトけい酸テトラエチル 上流と下流の製品情報
原材料
準備製品