Polyvinyl Doro (PVA) firimu rinoshandiswa zvakanyanya mumaindasitiri akasiyana nekuda kwayobiodegradability, kunyungudika kwemvura, uye zvakanakisa zvekugadzira firimu. Nekudaro, kuwana yemhando yepamusoroPVA firimu coatinginoda kunyatsosarudzwa kwezvakagadzirwa. Kunzwisisa izvi zvakakosha zvinongedzo kwakakosha mukuvandudza kuita kwemafirimu, kusimba, uye kushanda.
1. Polyvinyl Doro (PVA) - The Core Component
Pamwoyo wePVA firimu yekuputira manyepopolyvinyl doro, yekugadzira polymer inopa yakanakisa kunamatira, kuchinjika, uye zvipingamupinyi zvivakwa. Iyo molecular uremu uye dhigirii re hydrolysis yePVA inobata zvakananga iyoSimba remufirimu, kunyungudika, uye kusamira kwemakemikari. Kusarudza iyo PVA giredhi chaiyo inova nechokwadi chekushanda kwakakwana mumashandisirwo akadai sekurongedza, zvekurima, uye mishonga.
2. Plasticizers - Kuwedzera Flexibility uye Simba
Plasticizers inowedzerwa kunekuvandudza kushanduka uye mechanical propertiesyePVA mafirimu. Pasina plasticizers, iyo firimu inogona kuita brittle uye inowanzoita kuputika. Mapurasitiki akajairika anoshandiswa mukatiPVA firimu coatingzvinosanganisira:
•Glycerol- Plasticizer inoshandiswa zvakanyanya iyo inowedzera kushanduka uye kuchengetedza hunyoro.
•Polyethylene Glycol (PEG)- Inovandudza elasticity yefirimu uye inodzivirira shrinkage.
•Sorbitol-Inonatsiridza kusimba uku uchichengeta yakakwira mwero wekujeka.
Kusarudza plasticizer yakakodzera kunobatsira kuenzanisasimba, pachena, uye kusandukakune zvakasiyana siyana zvinodiwa mumaindasitiri.
3. Crosslinking Agents - Kuvandudza Durability uye Water Resistance
Mafirimu ePVA anowanzoda ma-crosslinking agents kutikuwedzera makemikari kuramba, mwando kugadzikana, uye mechanical simba. Aya maajenti anoshanda nekugadzira zvisungo zvemakemikari pakati pe polymer cheni, zvichiita kuti firimu riwedzereyakasimba uye yakasimba. Common crosslinking agents anosanganisira:
•Borates (Borax)- Inovandudza kusimba kwemafirimu uye kunamatira zvivakwa.
•Glutaraldehyde-Inonatsiridza kusamira kwemvura uchichengetedza kuchinjika.
•Dicarboxylic Acids- Inosimbisa chimiro chemufirimu pasina kukanganisa biodegradability.
Iko kusanganiswa kwakakodzera kwe crosslinking agents kunovimbisa afirimu rePVA rinogara kwenguva refu uye rinoshanda.
4. Fillers - Kuvandudza Mechanical uye Optical Properties
Kugadzirisa magadzirirwo, chitarisiko, uye mashandiro ePVA film coatings,fillerszvinowanzowedzerwa. Zvinhu izvi zvinogona kuvandudzafirimu opacity, simba, uye mutengo-kubudirira. Mamwe mafiller anonyanya kushandiswa anosanganisira:
•Titanium Dioxide (TiO₂)- Inopa kuchena uye UV kuramba.
•Sirika (SiO₂)-Inowedzera simba remufirimu uye inoderedza kukwesha kwepamusoro.
•Calcium Carbonate (CaCO₃)- Inodzikisa mutengo wekugadzira uchichengetedza kuvimbika kwemufirimu.
Kushandisa mafirita akakodzera kunobatsira kugadzirisa maPVA mafirimu emaapplication chaiwo, senge biodegradable packaging, mafirimu ekurima, kana mabhegi anonyungudika nemvura.
5. Surfactants - Kugadzirisa Coating Uniformity
Kune imwe uyeyakapfava PVA film coating, ma surfactants anokosha. Mishonga iyikuderedza kushushikana kwepamusoro, zvichibvumira kuvhara kupararira zvakaenzana kumativi ose. Key surfactants anoshandiswa mukugadzira firimu rePVA anosanganisira:
•Non-ionic surfactants-Kuvandudza kunyorova kwefirimu uye kupararira.
•Anionic surfactants- Wedzera kugadzikana uye adhesion zvivakwa.
•Silicone-based surfactants- Deredza kukanganisa kwepamusoro uye kuvandudza kufanana kwemafirimu.
Kusarudzwa kwakakodzera kwesurfactant kunovimbisainopindirana firimu ukobvu uye kutsetseka, iyo yakakosha kune zvikumbiro zvinoda chaiyo barriers zvivakwa.
6. Zvinowedzera - Kuwedzera Kuita uye Kushanda
Kuwedzeramashandiro ekuwedzera ekuwedzerainogona kuiswa mukatiPVA film coatingskusangana nezvinodiwa zvemaindasitiri. Zvimwe zvakajairika zvinowedzera zvinosanganisira:
•UV Stabilizers- Dzivirira kubva pakusvibiswa kubva pakuvhenekwa nezuva.
•Anti-blocking Agents- Dzivirira zvidimbu zvemafirimu kubva pakunamatira pamwe panguva yekuchengetedza.
•Antimicrobial Agents- Wedzera hupenyu hwesherufu yechigadzirwa nekudzivisa kukura kwebhakitiriya.
Nekunyatsosarudza izvo zvinowedzera, vagadziri vanogonagadzirisa mafirimu ePVAkuwedzera kushandiswa kwavo mumaindasitiri akasiyana.
Mhedziso
Hunhu uye kuita kwePVA firimu coatingzvinoenderana ne akunyatsogadzirwa kwezvinhu zvakasvibiswa. Nekusarudza musanganiswa wakakodzera wePVA, plasticizers, crosslinking agents, fillers, surfactants, uye additives, vagadziri vanogona kugadzira mafirimu nekusimba kwepamusoro, kuchinjika, uye kushanda.
Kutsvaga emhando yepamusoro PVA firimu mhinduro?ContactJWELLnhasikuti uongorore zvinhu zvepamberi uye zvigadziriso zvekubatisa zvigadziriso zvinoenderana nezvido zvako!
Nguva yekutumira: Kubvumbi-02-2025