Polyvinyl doro PVA

Polyvinyl doro (PVA) ndeyekugadzira polymer inotorwa kubva kuvinyl acetate kuburikidza nepolymerization uye inotevera hydrolysis. Iyo polymer inonyungudika nemvura ine huwandu hwakawanda hwekushandisa nekuda kweiyo yakasarudzika zvivakwa. Ngationgororei zvimwe zvakakosha zve polyvinyl doro:

1. Chemical Structure: Polyvinyl doro inoratidzwa neinodzokorora unit yevinyl alcohol monomers. Iyo vinyl doro mayuniti akabatanidzwa pamwe chete nekabhoni-kabhoni imwe mabhondi, achigadzira mutsara wepolymer cheni. Nekudaro, yakachena vinyl doro haina kugadzikana, saka polyvinyl doro rinowanzo kugadzirwa ne hydrolysis ye polyvinyl acetate, uko mamwe emapoka eacetate anotsiviwa nemapoka ehydroxyl.

2. Properties:

• Kunyungudika kweMvura: Chimwe chezvinhu zvakakosha zvePVA ndeyekunyungudika kwayo kwemvura. Inonyungudika nyore nyore mumvura kuti igadzire mhinduro dzakajeka, dzakajeka, zvichiita kuti ive yakakodzera kune zvakasiyana-siyana zvinoshandiswa apo mvura-based formulations inodiwa.
• Firimu-Kugadzira Kugona: PVA inogona kuumba akajeka, anochinjika mafirimu kana akakandwa kubva kune ayo aqueous mhinduro. Aya mafirimu ane simba rakanaka remagetsi, zvipingamupinyi, uye kunamatira kune substrates, zvichiita kuti zvive zvakakosha mumashandisirwo akaita semajasi, zvinonamira, uye zvekurongedza.
• Biocompatibility: PVA inowanzoonekwa seinopindirana uye isina muchetura, ichiita kuti ive yakakodzera kushandiswa mune dzakasiyana siyana dzekurapa nemishonga, senge masisitimu ekuendesa zvinodhaka, machira ekupfeka, uye machira einjiniya.
• Kemikari Kugadzikana: PVA inoratidza kugadzikana kwakanaka kwemakemikari, kuramba kuderedzwa nemaasidhi, mabhesi, uye organic solvents pasi pemamiriro akajairika. Nekudaro, inogona kuita hydrolysis pasi pe acidic kana alkaline mamiriro, zvichitungamira mukurasikirwa kwezvivakwa.

3. Zvishandiso: Polyvinyl doro rine huwandu hwakasiyana hwekushandisa mumaindasitiri akasiyana siyana:

• Adhesives: PVA-based adhesives anoshandiswa zvakanyanya mukugadzira matanda, mapepa ekurongedza, uye zvigadzirwa zvevatengi nekuda kwekunamira kwavo kwakanaka, kuramba mvura, uye nyore kushandisa.
• Machira: PVA fibers anoshandiswa mumachira maapplication kupa simba, abrasion kuramba, uye dimensional kugadzikana kune machira.
• Packaging: Mafirimu ePVA-based anoshandiswa semidziyo yekurongedza chikafu, mishonga, uye zvimwe zvigadzirwa nekuda kwezvivharidzo zvavo uye biodegradability.
• Pepa Coatings: PVA-based coatings inoiswa pabepa uye pepa bhodhi kuti inatsiridze kutsvedzerera kwepamusoro, kudhinda, uye kusamira kwehunyoro.
• Kuvaka: PVA-yakavakirwa maumbirwo anoshandiswa mukuvaka zvinhu senge simende admixtures, plaster additives, uye dhaka modhifita kuwedzera kushanda, kunamatira, uye kusimba.

4. Mafungiro Ezvakatipoteredza: Kunyange zvazvo doro repolyvinyl richigoneka pasi pemamwe mamiriro ezvinhu, kushandiswa kwaro kwakapararira nekuraswa kunogona kunge kuine zvarinoreva zvakatipoteredza. Biodegradation yePVA inowanzoitika kuburikidza nehutachiona hwekuita munzvimbo dzeaerobic, senge zvivakwa zvecompost kana zvidyarwa zvekuchenesa mvura. Nekudaro, munzvimbo dzeanaerobic, senge marara, PVA inogona kuramba kwenguva yakareba. Nhamburiko dzekugadzira biodegradable kana kuvandudzwa dzimwe nzira dzechinyakare PVA maumbirwo arikuenderera mberi kudzikamisa izvi zvinonetsa kwezvakatipoteredza.

Muchidimbu, polyvinyl doro (PVA) imhando yepolymer ine huwandu hwakasiyana hwekushandisa nekuda kwekunyungudika kwayo kwemvura, kugona kugadzira firimu, biocompatibility, uye kugadzikana kwemakemikari. Kushandiswa kwaro kunobata maindasitiri akadai seanonamira, machira, kurongedza, mapepa ekuputira, uye zvekuvakisa. Nepo PVA ichipa akawanda mabhenefiti, kufunga kwezvakatipoteredza uye kuedza kukudziridza dzimwe nzira dzakasimba zvinhu zvakakosha mukuenderera kwayo kushandiswa nekusimudzira.