Polyvinyl barasa (PVA) foda shine polymer roba mai narkewa wanda ke da nau'ikan aikace-aikace a masana'antu daban-daban.Yana da linzamin kwamfuta, kayan polymeric da aka yi daga hydrolysis na polyvinyl acetate (PVAc).Matsayin hydrolysis (DH) na PVA yana ƙayyade solubility a cikin ruwa, tare da ƙimar DH mafi girma yana nuna mafi girma solubility.PVA foda yana samuwa a cikin nau'o'i daban-daban, dangane da ƙimar DH da nauyin kwayoyin.

Properties na PVA foda PVA foda yana da dama na musamman kaddarorin da ya sa ya zama sananne zabi a yawancin aikace-aikace.Wasu daga cikin waɗannan kaddarorin sun haɗa da:

1. Ruwa mai narkewa: PVA foda yana da matukar ruwa mai narkewa, yana sauƙaƙa narkewa cikin ruwa don samar da bayani mai haske.
2. Yin fim: PVA foda zai iya samar da fim mai tsabta, mai sauƙi, da karfi lokacin da aka narkar da shi cikin ruwa sannan kuma ya bushe.
3. Adhesion: PVA foda na iya manne wa nau'i-nau'i daban-daban, yana sa ya zama sanannen zabi a cikin adhesives.
4. Biodegradability: PVA foda ne biodegradable, ma'ana cewa za a iya rushe ta hanyar halitta matakai.

Aikace-aikace na PVA foda

1. Adhesives: Ana amfani da foda na PVA a matsayin abu na farko a cikin adhesives.Ana amfani da shi wajen samar da mannen itace, manne takarda, da mannen yadi.Manne PVA ya dace don haɗa saman fage, kamar takarda, kwali, da itace.
2. Marufi: Ana amfani da foda na PVA a cikin samar da kayan aiki kamar fina-finai da sutura.Fim ɗin da aka kafa daga PVA foda yana da ƙarfin ƙarfi mai ƙarfi, kyawawan kaddarorin shinge na iskar gas, da ingantaccen haske na gani.
3. Masana'antar Yadi: Ana amfani da foda na PVA a cikin masana'antar masana'anta don samar da ma'auni mai ƙima don yarn da yadudduka.Ana amfani da shi don ƙara ƙarfi da ƙima na yarn ko masana'anta, yana sauƙaƙa saƙa da rikewa.
4. Masana'antar takarda: Ana amfani da foda na PVA a cikin masana'antar takarda a matsayin ƙari na ƙarshen rigar.Ana amfani da shi don inganta ƙarfin, juriya na ruwa, da kuma buga takarda.
5. Masana'antar gine-gine: Ana amfani da foda na PVA a cikin masana'antar gine-gine a matsayin mai ɗaure don siminti da sauran kayan gini.Hakanan ana amfani dashi azaman sutura don shimfidar siminti don inganta juriyar ruwan su.
6. Abubuwan kulawa na sirri: Ana amfani da foda PVA a cikin samfuran kulawa na sirri kamar gashin gashi, shamfu, da gels.Ana amfani da shi azaman fim-tsohon fim da mai kauri don inganta rubutu da aikin waɗannan samfuran.
7. Masana'antar likitanci: Ana amfani da foda PVA a cikin masana'antar likita don samar da hydrogels, suturar rauni, da tsarin isar da magunguna.Kwayoyin halitta da ruwa-ruwa na PVA sun sa ya zama kayan aiki mai mahimmanci don waɗannan aikace-aikacen.

Nau'in PVA foda PVA foda yana samuwa a cikin nau'i daban-daban, dangane da ƙimar DH da nauyin kwayoyin.Darajar DH na PVA foda ya fito daga 87% zuwa 99%.Mafi girman darajar DH, mafi yawan ruwa mai narkewa da PVA foda shine.Nauyin kwayoyin halitta na PVA foda ya fito daga dubban dubban zuwa miliyoyin da yawa.

1. Cikakken foda PVA foda: Wannan nau'in PVA foda yana da ƙimar DH na 99% ko mafi girma.Yana da matukar narkewar ruwa kuma yana da kyawawan abubuwan ƙirƙirar fim.Ana yawan amfani da shi a aikace-aikace kamar adhesives, marufi, da yadi.
2. Partially hydrolyzed PVA foda: Wannan nau'in PVA foda yana da ƙimar DH wanda ke fitowa daga 87% zuwa 98%.Yana da ƙasa da ruwa mai narkewa fiye da cikakken foda PVA foda kuma yana da ƙananan kayan aikin fim.Ana yawan amfani da shi a aikace-aikace kamar takarda da gini.