Polyvinyl doro (PVA) poda imvura-inonyungudika yakagadzirwa polymer ine huwandu hwakasiyana hwekushandisa mumaindasitiri akasiyana.Iyo mutsara, polymeric zvinhu zvakagadzirwa kubva kuhydrolysis ye polyvinyl acetate (PVAc).Dhigirii reHydrolysis (DH) yePVA inotarisa kunyungudika kwayo mumvura, nehupamhi hweDH hunoratidza kunyungudika kwepamusoro.PVA powder inowanikwa mumakiredhi akasiyana-siyana, zvichienderana nehuwandu hweDH uye molecular weight.

Zvivakwa zvePVA poda PVA poda ine akati wandei akasiyana zvivakwa zvinoita kuti ive yakakurumbira sarudzo mumashandisirwo mazhinji.Zvimwe zvezvivakwa izvi zvinosanganisira:

1. Kunyungudika kwemvura: PVA powder inonyanya kunyungudika mumvura, zvichiita kuti zvive nyore kunyunguduka mumvura kuti iite mhinduro yakajeka.
2. Firimu-kuumba: PVA powder inogona kuumba firimu rakajeka, rinoshanduka, uye rakasimba kana ranyungudutswa mumvura uye raoma.
3. Adhesion: PVA powder inogona kunamatira kune zvakasiyana-siyana, zvichiita kuti ive sarudzo yakakurumbira mune zvinonamatira.
4. Biodegradability: PVA powder is biodegradable, zvinoreva kuti inogona kuputsika nemaitiro echisikigo.

Zvikumbiro zvePVA powder

1. Adhesives: PVA powder inowanzoshandiswa sechinhu chinonyanya kukosha muzvinyorwa.Inoshandiswa mukugadzirwa kwehuni glue, pepa guruu, uye machira anonamira.PVA adhesive inokodzera kubatanidza nzvimbo dzine porous, senge bepa, kadhibhodhi, uye huni.
2. Packaging: PVA poda inoshandiswa mukugadzira zvinhu zvekurongedza zvakaita semafirimu uye machira.Iyo firimu yakaumbwa kubva kuPVA poda ine yakakwira kusimba simba, yakanaka gasi inodzivirira zvivakwa, uye yakanaka yekuona kujeka.
3. Indasitiri yemachira: PVA poda inoshandiswa muindasitiri yemachira kugadzira saizi maejenti eshinda nemachira.Inoshandiswa kuwedzera kusimba uye kuoma kweshinda kana jira, zvichiita kuti zvive nyore kuruka uye kubata.
4. Indasitiri yemapepa: PVA poda inoshandiswa muindasitiri yemapepa seyakanyorova-kuguma kwekuwedzera.Inoshandiswa kuvandudza simba, kudzivirira mvura, uye kudhindwa kwepepa.
5. Indasitiri yekuvaka: PVA poda inoshandiswa muindasitiri yekuvaka sebhainda resimende nezvimwe zvekuvaka.Inoshandiswawo sechifukidziro chenzvimbo dzekongiri kuti dzivandudze kudzivirira kwavo kwemvura.
6. Zvigadzirwa zvekuchengeta wega: PVA poda inoshandiswa muzvigadzirwa zvekuchengeta munhu senge maspray ebvudzi, shampoos, uye gels.Inoshandiswa semufirimu-kare uye mukobvu kuti uvandudze magadzirirwo uye kuita kwezvigadzirwa izvi.
7. Indasitiri yezvokurapa: PVA poda inoshandiswa muindasitiri yezvokurapa kugadzira mahydrogel, maronda ekupfeka, uye masisitimu ekutumira zvinodhaka.Iyo biocompatibility uye mvura-solubility yePVA inoita kuti ive chinhu chakanakira izvi maapplication.

Mhando dzePVA powder PVA powder inowanikwa mumakirasi akasiyana-siyana, zvichienderana nehuwandu hwayo hweDH uye molecular weight.Iyo DH kukosha kwePVA powder inotangira kubva ku87% kusvika ku99%.Iyo yakakwirira iyo DH kukosha, iyo yakawanda-inonyungudika mvura iyo PVA poda iri.Iyo molecular huremu hwePVA hupfu hunotangira kubva kuzviuru zvakati kusvika kumamiriyoni akati wandei.

1. Fully hydrolyzed PVA powder: Mhando iyi yePVA powder ine DH kukosha kwe99% kana kupfuura.Iyo yakanyanya kunyungudika mumvura uye ine yakanakisa firimu-inogadzira zvinhu.Inowanzo shandiswa mumashandisirwo akadai seanonamira, kurongedza, uye machira.
2. Partially hydrolyzed PVA powder: Mhando iyi yePVA powder ine DH kukosha kubva ku87% kusvika ku98%.Iyo ishoma-inonyungudika mumvura pane yakazara hydrolyzed PVA poda uye ine yakaderera firimu-kugadzira zvimiro.Inowanzoshandiswa mumashandisirwo akadai sepepa uye kuvaka.