{"id":567,"date":"2024-02-04T11:58:34","date_gmt":"2024-02-04T03:58:34","guid":{"rendered":"https:\/\/joyforce-tech.com\/?p=567"},"modified":"2024-08-25T13:44:07","modified_gmt":"2024-08-25T05:44:07","slug":"the-use-of-polyvinyl-alcohol-and-its-gelation-process","status":"publish","type":"post","link":"https:\/\/joyforce-tech.com\/et\/the-use-of-polyvinyl-alcohol-and-its-gelation-process.html","title":{"rendered":"Pol\u00fcvin\u00fc\u00fclalkoholi kasutamine ja selle geelistumine"},"content":{"rendered":"<p>Pol\u00fc(vin\u00fc\u00fclalkohol) on mingi vees lahustuv pol\u00fcmeer, mis saadakse monomeeri pol\u00fcmerisatsiooni asemel pol\u00fcvin\u00fc\u00fclatsetaadi h\u00fcdrol\u00fc\u00fcsi teel. See lahustub gl\u00fctseriinis 120-150 \u2103 juures, kuid muutub toatemperatuuril tarretiseks. Pol\u00fcvin\u00fc\u00fclalkoholi lahustamise etapis tuleb materjal lisada toatemperatuuril olevasse vette segades ja seej\u00e4rel kuumutada, et kiirendada lahustumist.<\/p>\n<p>PVA 17-88 vesilahuse viskoossus suureneb aja jooksul toatemperatuuril. Kui kontsentratsioon on 8%, on viskoossus siiski t\u00e4iesti stabiilne. Pol\u00fcvin\u00fc\u00fclalkoholi 17-92 nimetatakse PVA17 92-ks. PvA17 99 lahus on PVA17-88 suhtes tundlikum kui PVA17-88. Booraks 0,1% lahuse kvaliteedist \u017eeleerub 5%PVA17 99 lahus ja sama kontsentratsiooniga PVA17-88 vesilahuse p\u00f5hjustatud booraksi kogus on 1%. Pol\u00fcvin\u00fc\u00fclalkoholi 1799b kasutatakse peamiselt k\u00f5rge viskoossusega pol\u00fcvin\u00fc\u00fclbut\u00fcraali valmistamiseks. Seda kasutatakse laialdaselt dispergendi liimimisvahendina.<\/p>\n<p>Lisaks sellele on pol\u00fcvin\u00fc\u00fclalkoholile iseloomulikud mitmesugused sekundaarsete h\u00fcdroks\u00fc\u00fcl\u00fchendite reaktsioonid, n\u00e4iteks esterdamine. Seda saab lagundada tugevas happes, pehmendada v\u00f5i lahustada n\u00f5rga happe ja alusega. K\u00f5rge kontsentratsiooniga PVA ei sobi kokku anorgaaniliste sooladega, eriti sulfaatide ja fosfaatidega. Fosfaat v\u00f5ib sadestuda 5% (w\/v) PVA. Booraks v\u00f5ib moodustada pol\u00fcvin\u00fc\u00fclalkoholi lahusega geeli.<\/p>\n<p>Pol\u00fcvin\u00fc\u00fclalkohol on hea liim, mis v\u00f5ib asendada enamikku t\u00f6\u00f6stuslikest liimidest. Kuidas keeta pol\u00fcvin\u00fc\u00fclalkoholi liimi? K\u00f5igepealt valmistage ette mitu pol\u00fcvin\u00fc\u00fclalkoholi, 1000 ml keeduklaas, klaasplaat, elektripliit ja roostevabast terasest bassein (l\u00e4bim\u00f5\u00f5t 30-40 cm). Kui valmis, v\u00f5tke keeduklaasi 50-80 grammi pol\u00fcvin\u00fc\u00fclalkoholi. Lisage keeduklaasi 900-1000 ml normaaltemperatuurilist vett ja segage klaasist vardaga. Vesi ei tohiks olla liiga t\u00e4is. Parem on, kui see on keeduklaasi suust 2-3 cm kaugusel. Kui see on liiga t\u00e4is, voolab soojus \u00fcle. Pange keeduklaas roostevabast terasest basseini, lisage roostevabast terasest basseini normaaltemperatuuriline vesi ja uputage see 2\/3 keeduklaasi k\u00f5rgusest. Pange roostevaba terasbassein elektriahju kuumutamiseks ja segage kuumutamise ajal. P\u00e4rast seda, kui tahke pol\u00fcvin\u00fc\u00fclalkohol on t\u00e4ielikult lahustunud, v\u00f5tke keeduklaas v\u00e4lja (olge ettevaatlik, et see ei k\u00f5rvetaks) ja jahutage see toatemperatuurini ooteseisundiks. Olge ettevaatlik elektrilekke suhtes ja v\u00e4ltige elektril\u00f6\u00f6ki. Ettevaatust: Kuum. Kuumutamise ajal segage t\u00e4ielikult, et v\u00e4ltida vistrikute tekkimist.<\/p>","protected":false},"excerpt":{"rendered":"<p>Poly (vinyl alcohol) is a kind of water-soluble polymer obtained by hydrolysis of polyvinyl acetate instead of monomer polymerization. It is soluble in glycerin at 120-150 \u2103, but becomes jelly at room temperature. In the dissolving step of polyvinyl alcohol, the material should be added into room temperature water under stirring, and then heated to [&hellip;]<\/p>","protected":false},"author":2,"featured_media":568,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[43],"tags":[],"class_list":["post-567","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bolg"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.9.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>The use of polyvinyl alcohol and its gelation process - Joyforce PVA Film and Bag<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/joyforce-tech.com\/et\/the-use-of-polyvinyl-alcohol-and-its-gelation-process.html\/\" \/>\n<meta property=\"og:locale\" content=\"et_EE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The use of polyvinyl alcohol and its gelation process - Joyforce PVA Film and Bag\" \/>\n<meta property=\"og:description\" content=\"Poly (vinyl alcohol) is a kind of water-soluble polymer obtained by hydrolysis of polyvinyl acetate instead of monomer polymerization. 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