ポリビニルホルマール 化学特性,用途語,生産方法
解説
ポリ(ビニルアルコール)水溶液に酸触媒下，ホルマリンを反応させてホルマール化した樹脂．電気絶縁性，機械的特性，接着性などにすぐれ，エナメル電線用ワニス，接着剤，塗料などに使用される．森北出版「化学辞典（第2版）
使用
It is used in the anomalous sorption and pervaporation of aqueous organic mixtures by poly(vinyl acetal) membranes. Poly(vinyl formal) is mainly used in three general applications wire coatings, surface coatings and adhesives. The first and extensive application of poly(vinyl formal) is in the manufacture of a tough, adhesive and heat resistant wire enamel.
製造方法
Poly(vinyl formal) was developed by General Electric as a wire coating and the early process involved direct reaction of a mixture of poly(vinyl acetate), glacial acetic acid, formalin and concentrated sulfuric acid at 70°C. After the desired degree of polymerization is obtained, ammonium hydroxide is added to bring the pH to about 9-10. The reaction mixture is poured into water to precipitate the poly(vinyl formal). Poly(vinyl formais) have also been used as fibers.
ポリビニルホルマール 上流と下流の製品情報
原材料
準備製品