polyvinyl acetate
polyvinyl acetate
| Noun | 1. | polyvinyl acetate - a vinyl polymer used especially in paints or adhesives |
| 单词 | polyvinyl acetate | |||
| 释义 | polyvinyl acetatepolyvinyl acetate
Polyvinyl Acetatepolyvinyl acetate[¦päl·i′vīn·əl ′as·ə‚tāt]Polyvinyl Acetatea polymer of vinyl acetate, [—CH2—CH(OCOCH3)—]n. Polyvinyl acetate is a hard, colorless, and nontoxic substance with a molecular weight of 10,000–1,500,000, depending on preparation conditions. It is soluble in many organic solvents but not in gasoline, mineral oils, or water. Polyvinyl acetate softens at low temperatures (26°-28° C) and exhibits cold flow and high adhesion to various materials. Polyvinyl acetate is produced by the free-radical polymerization of a monomer in a solution, emulsion, or suspension. It is produced in the form of granules (beads), aqueous dispersions, or varnish solutions. Polyvinyl acetate is an intermediate product in the synthesis of polyvinyl alcohol and polyvinyl acetals. It is used in the manufacture of interior and exterior emulsion paint finishes and adhesives for wood, paper, leather, and fabrics. It is added to concrete to improve its quality and is used in the production of seamless floors and chewing gum. In the USSR, polyvinyl acetate products are known by various trade names. Alcohol solutions include brands S-4, 8,12,18, and 26 (the numbers indicate the mean viscosity in centipoises). Beads include nos. 15, 25, 50, 75, and 100, and aqueous dispersions are known as NV, SV, and VV. Outside the USSR, aqueous dispersions are primarily produced; trade names include Gelva and Vinylite (USA), Evaflex (Japan), Rhodopas (France), and Alkathene (Great Britain). World production of polyvinyl acetate in 1973 was about 1 million tons. REFERENCESSee references under .E. N. ROSTOVSKII polyvinyl acetate, PVASee PVAC polyvinyl acetate
Synonyms for polyvinyl acetate
|
|||
| 随便看 |
|
英语词典包含2567994条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。