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Polyvinyl Formal: Polyvinyl Acetate Acetalised with Formalin, Shawinigan 1933
Polyvinyl acetate dissolved in glacial acetic acid, with formalin and a little sulfuric acid, kept stirred 24 hours at 70 °C, loses its acetate groups and takes up formaldehyde: polyvinyl formal, a hard, tough, pale resin. Shawinigan's patent (1933) gives the recipe; it is the resin of 'Formvar' magnet-wire enamel.
The picture: our diagram of the reaction.
Juu
24 hours, then drying
Maudhui hatari
Blueprint hii ina taratibu za hatari. Ingia na uwashe maudhui ya hatari katika mipangilio ya akaunti yako ili kuona maagizo ya hatua kwa hatua.
IngiaMchoro huu unatengeneza
Blueprint zinazohusiana
Blueprint hizi zinashiriki maarifa — mbinu, vifaa au kanuni
CC0 Umma Wote
Mchoro huu umetolewa chini ya CC0. Uko huru kunakili, kubadilisha, kusambaza, na kutumia kazi hii kwa madhumuni yoyote, bila kuomba ruhusa.
Saidia Mtengenezaji kwa kununua bidhaa kupitia Mchoro wao ambapo wanapata Kamisheni ya Mtengenezaji iliyowekwa na Wachuuzi, au unda marudio mapya ya Mchoro huu na uiunganishe kama kiungo katika Mchoro wako kuchangia mapato.