{"id":1015,"date":"2024-02-04T14:00:38","date_gmt":"2024-02-04T06:00:38","guid":{"rendered":"https:\/\/joyforce-tech.com\/?p=1015"},"modified":"2024-08-25T13:43:06","modified_gmt":"2024-08-25T05:43:06","slug":"modified-with-polyvinyl-alcohol","status":"publish","type":"post","link":"https:\/\/joyforce-tech.com\/fi\/modified-with-polyvinyl-alcohol.html","title":{"rendered":"Muokattu polyvinyylialkoholilla"},"content":{"rendered":"

Polyvinyylialkoholi (PVA) on v\u00e4rit\u00f6n, myrkyt\u00f6n, sy\u00f6vytt\u00e4m\u00e4t\u00f6n, biohajoava, vesiliukoinen orgaaninen polymeeri. T\u00e4ll\u00e4 hetkell\u00e4 PVA:ta k\u00e4ytet\u00e4\u00e4n laajalti vinyylin raaka-aineen lis\u00e4ksi tekstiilien liimauksessa, pinnoitteissa, liimoissa, emulgointiaineissa, kalvoissa ja muilla teollisuuden aloilla. PVA-molekyyli sis\u00e4lt\u00e4\u00e4 kuitenkin suuren m\u00e4\u00e4r\u00e4n hydroksyyliryhmi\u00e4, mik\u00e4 johtaa PVA:n huonoon vedenkest\u00e4vyyteen ja vakauteen, mik\u00e4 vaikuttaa sen soveltamiseen. Kemiallisen kuituteollisuuden sovelluksissa PVA:lla on haittoja, kuten nahan irtoaminen, vaahtoaminen ja riitt\u00e4m\u00e4t\u00f6n tarttuvuus kuituihin. Siksi sen vedenkest\u00e4vyyden parantamiseksi k\u00e4ytet\u00e4\u00e4n yleens\u00e4 kemiallisia modifikaatiomenetelmi\u00e4. PVA:n modifioinnissa k\u00e4ytet\u00e4\u00e4n p\u00e4\u00e4asiassa vinyyliasetaatin kaksoissidosten, esteriryhmien ja hydroksyyliryhmien kemiallista reaktiivisuutta alkoholisoinnin j\u00e4lkeen sivuketjuryhmien tai -rakenteiden muuttamiseksi ja muiden monomeerien k\u00e4ytt\u00f6\u00f6n ottamiseksi PVA-pohjaisiksi kopolymeereiksi; Muut funktionaaliset ryhm\u00e4t, jotka muuttavat PVA-makromolekyylien kemiallista rakennetta.<\/p>\n

\"\"<\/p>","protected":false},"excerpt":{"rendered":"

Polyvinyl alcohol (PVA) is a colorless, non-toxic, non-corrosive, biodegradable water-soluble organic polymer. At present, in addition to being the raw material of vinylon, PVA is widely used in textile sizing, coatings, adhesives, emulsifiers, films and other industrial fields. However, the PVA molecule contains a large number of hydroxyl groups, resulting in poor water resistance and […]<\/p>","protected":false},"author":2,"featured_media":1008,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[43],"tags":[],"class_list":["post-1015","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bolg"],"acf":[],"yoast_head":"\nModified with polyvinyl alcohol - 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\/fi\/modified-with-polyvinyl-alcohol.html\/\" \/>\n<meta property=\"og:locale\" content=\"fi_FI\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Modified with polyvinyl alcohol - Joyforce PVA Film and Bag\" \/>\n<meta property=\"og:description\" content=\"Polyvinyl alcohol (PVA) is a colorless, non-toxic, non-corrosive, biodegradable water-soluble organic polymer. 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