けい素ジオキシド 化学特性,用途語,生産方法
外観
青色〜青紫色, 粒状
定義
本品は、含水ケイ酸であり、次の化学式で表される。
xは製法により異なり、０を含む
溶解性
水に不溶。ふっ化水素酸に可溶。熱水酸化ナトリウム溶液に溶け、水にほとんど溶けない。
解説
シリカ,SiO2(60.08)．二酸化ケイ素，無水ケイ酸ともいう．しばしば無定形二酸化ケイ素の意味に用いられる．
用途
塗料、ラッカー印刷インキ合成樹脂等の添加剤
用途
高純度金属酸化物。
用途
けい素標準液調製原料。有機合成(和光試薬時報Vol.63 No.2,p.26(1995))。
用途
環境ホルモン類の分析の前処理用。
用途
塗料?ラッカー?インキ?合成樹脂?繊維?断熱材?天然ゴム?合成ゴム?シリコーンゴム?医薬?化粧品?グリース?窯業製品?農薬乳化剤配合原料、油脂類の脱色,触媒?触媒担体、不飽和ポリエステルの増粘剤?ろ過助剤、充てん剤、消泡剤、精密鋳造のバインダー、クラフト紙のすべり止め、一般脱湿乾燥用、炭酸ガスの吸着除去、IC封止剤用フィラー、高純度ガラス染料、殺虫剤(登録)、植物成長調整剤(失効農薬) (化学工業日報社)
用途
ダイオキシン類の分析において、試料精製(単層及び多層にて)使用する。各種試料の分析の際に夾雑物の除去などの前処理操作に使用される吸着剤です。
化粧品の成分用途
不透明化剤、非活性剤系分散剤、抗ケーキング剤、口腔ケア剤、皮膚コンディショニング剤、親水性増粘剤、吸着剤、研磨.スクラブ剤、増量剤
効能
懸濁剤, 希釈剤, 肥厚剤
主な用途／役割
エポキシ樹脂系接着剤に使用される。
使用上の注意
純度は金属ベースで差数法によって算出したもので、重量又は容量分析等の化学的方法によるものではありません。使用目的により、正確な含量が必要な場合は、それらの方法によって測定する必要があります。
化学的特性
white crystals or powder
物理的性質
Colorless amorphous (i.e., fused
silica) or crystalline (i.e., quartz)
material having a low thermal
expansion coefficient and
excellent optical transmittance
in far UV. Silica is insoluble in
strong mineral acids and alkalis
except HF, concentrated H
3PO
4, NH
4 HF
2 , concentrated alkali metal hydroxides. Owing to its
good corrosion resistance to
liquid metals such as Si, Ge, Sn,
Pb, Ga, In, Tl, Rb, Bi, and Cd, it
is used as crucible container for
melting these metals, while silica
is readily attacked in an inert
atmosphere by molten metals
such as Li, Na, K Mg, and Al.
Quartz crystals are piezoelectric
and pyroelectric. Maximum
service temperature 1090°C.
使用
Silicon(IV) oxide, amorphous is used as carriers, processing aids, anti-caking and free-flow agents in animal feed. Defoamer applications such as paint, food, paper, textile and other industrial applications. Synthetic silicon dioxides are used as a rheology control agent in plastics. It is also used to manufacture adhesives, sealants and silicones.
定義
ChEBI: A silicon oxide made up of linear triatomic molecules in which a silicon atom is covalently bonded to two oxygens.
一般的な説明
contains sodium stabilizing counterion
危険性
Not toxic if ingested, inhaled silica dust can
cause silicosis; carcinogen.
农业用途
Silica is silicon dioxide, one of the most abundant
materials on the earth's crust. Quartz is an example of
silica. It is used as a filler in fertilizers, and also, in the
manufacture of glass, ceramics, abrasives, rubber and
cosmetics.
安全性プロファイル
The pure unaltered form is considered a nuisance dust. Some deposits contain small amounts of crystahne quartz and are therefore fibrogenic. When diatomaceous earth is calcined (with or without fluxing agents) some sdica is converted to cristobalite and is therefore fibrogenic. Tridymite has never been detected in calcined batomaceous earth. See also other silica entries
職業ばく露
Diatomaceous earth is used as
a filtering agent and as a filler in construction materials,
pesticides, paints, and varnishes. The calcined version
(which has been heat treated) is the most dangerous and
contains crystallized silica, and should be handled as silica.
See also other entries on silica
輸送方法
This material is not singled out by DOT
in its
Performance-Oriented Packaging Standards.
純化方法
Purification of silica for high technology applications uses isopiestic vapour distillation from concentrated volatile acids and is absorbed in high purity water. The impurities remain behind. Preliminary cleaning to remove surface contaminants uses dip etching in HF or a mixture of HCl, H2O2 and deionised water [Phelan & Powell Analyst 109 1299 1984].
不和合性
Silica, amorphous is a noncombustible solid. Generally unreactive chemically. Incompatible with fluorine, oxygen difluoride, chlorine trifluoride. Soluble in molten alkalis and reacts with most metallic oxides at high temperature.
廃棄物の処理
Sanitary landfill.
けい素ジオキシド 上流と下流の製品情報
原材料
準備製品