Dambudziko rekudzikira kwe viscosity panguva yekuchengetwa kwependi idambudziko rinowanzoitika, kunyanya mushure mekuchengetwa kwenguva refu, viscosity yependi inodzikira zvakanyanya, zvichikanganisa mashandiro ekuvaka uye kunaka kwechigadzirwa. Kudzikira kwe viscosity kwakabatana nezvinhu zvakawanda, zvakaita sekupisa, hunyoro, solvent volatilization, polymer degradation, nezvimwewo, asi kusangana ne thickener cellulose ether kwakanyanya kukosha.
1. Basa guru re cellulose ether
Cellulose ether chinhu chinowanzo shandiswa zvakanyanya mukupenda kwemvura. Mabasa avo makuru anosanganisira:
Kukora: Cellulose ether inogona kugadzira network yakazvimba ine mativi matatu nekunwa mvura, nokudaro ichiwedzera kusimba kwesystem uye kuvandudza thixotropy uye mashandiro ependi.
Kugadzikana kwesimbi: Cellulose ether inogona kudzivirira kusvibiswa kwezvidimbu zvakasimba zvakaita sepigments uye fillers mupendi uye kuchengetedza kufanana kwependi.
Hunhu hwekugadzira firimu: Cellulose ether inogonawo kukanganisa hunhu hwekugadzira firimu hwependi, zvichiita kuti chifukidziro chive chakasimba uye chakasimba.
Kune mhando dzakawanda dze cellulose ethers, dzinosanganisira methyl cellulose (MC), hydroxyethyl cellulose (HEC), hydroxypropyl methyl cellulose (HPMC), nezvimwewo. Zvinhu izvi zvine kunyungudika kwakasiyana, kugona kukora uye kuramba kuchengetedza zvinhu muzvipfeko.
2. Zvikonzero zvikuru zvekudzikira kwe viscosity
Munguva yekuchengetera machira, kudzikira kwe viscosity kunonyanya kukonzerwa nezvikonzero zvinotevera:
(1) Kuora kwe ether dze cellulose
Kukora kwemasero emu cellulose muzvipfeko zvinoenderana nehukuru hwehuremu hwawo hwemamorekuru uye kusimba kwechimiro chawo chemorekuru. Munguva yekuchengetwa, zvinhu zvakaita sekupisa, acidity uye alkalinity, uye tupukanana tunogona kukonzera kuora kwemasero emu cellulose. Semuenzaniso, panguva yekuchengetwa kwenguva refu, zvikamu zveacidic kana alkaline muzvipfeko zvinogona hydrolyze cheni yemasero emu cellulose ether, kuderedza huremu hwayo hwemamorekuru, uye nokudaro zvichideredza simba rayo rekukora, zvichikonzera kudzikira kwe viscosity.
(2) Kushanduka kwemvura inonyunguduka uye kufamba kwehunyoro
Kushanduka kwemvura inonyunguduka kana kufamba kwemvura mujira kunogona kukanganisa mamiriro ekunyunguduka kwe cellulose ether. Panguva yekuchengetwa, chikamu chemvura chinogona kupwanyika kana kutamira pamusoro pejira, zvichiita kuti kupararira kwemvura mujira kusaenzane, nokudaro zvichikanganisa kuzvimba kwe cellulose ether uye zvichikonzera kudzikira kwe viscosity munzvimbo dzemuno.
(3) Kurwiswa kwehutachiona
Kukura kwehutachiona kunogona kuitika mujira racho kana rikasachengetwa zvakanaka kana kuti mishonga inochengetedza isingashande. Zvirwere zvinogona kuora cellulose ethers nezvimwe zvinosimbisa organic, zvichideredza simba razvo rekukora uye zvichiita kuti viscosity yejira iderere. Zvirwere zvinobva mumvura, kunyanya, inzvimbo yakanaka yekukura kwehutachiona nekuti zvine mvura yakawanda.
(4) Kuchembera zvakanyanya pakupisa
Kana zvinhu zvanyanya kuchengetwa panguva yekuchengetera tembiricha yepamusoro, chimiro chemuviri kana chemakemikari che cellulose ether molecular chain chinogona kuchinja. Semuenzaniso, cellulose ethers dzinowanzo kurumwa ne oxidation kana pyrolysis patembiricha yakakwira, zvichikonzera kushomeka kwemhedzisiro yekukora. Tembiricha yakakwira inokurumidzawo solvent volatilization uye evaporation yemvura, zvichikanganisa kugadzikana kwe viscosity.
3. Nzira dzekuvandudza kugadzikana kwekuchengetera machira
Kuti kuderedza kusviba kwe viscosity panguva yekuchengetera uye kuwedzera hupenyu hwekuchengetera kwejira, matanho anotevera anogona kutorwa:
(1) Kusarudza ether ye cellulose yakakodzera
Mhando dzakasiyana dze cellulose ethers dzine mashandiro akasiyana maererano nekugadzikana kwekuchengetedza. Cellulose ethers dzine huremu hwakawanda hwemamorekuru dzinowanzova nemigumisiro iri nani yekukora, asi kugadzikana kwadzo kwekuchengetedza kwakaderera, nepo cellulose ethers dzine huremu hwakaderera hwemamorekuru dzinogona kuva nekushanda kuri nani kwekuchengetedza. Saka, pakugadzira fomura, cellulose ethers dzine kugadzikana kwakanaka kwekuchengetedza dzinofanira kusarudzwa, kana kuti cellulose ethers dzinofanira kusanganiswa nedzimwe thickeners kuti dzivandudze kugadzikana kwadzo kwekuchengetedza.
(2) Kudzora pH yependi
Kuwanda kweacidity uye alkalinity ye coating system zvine simba guru pakugadzikana kwe cellulose ethers. Mukugadzira formulation, pH value ye coating inofanira kudzorwa kudzivirira acidity yakawandisa kana alkaline kuderedza kuparara kwe cellulose ethers. Panguva imwe chete, kuwedzera pH adjuster kana buffer yakakodzera kunogona kubatsira kudzikamisa pH ye system.
(3) Wedzera kushandiswa kwemishonga yekuchengetedza
Kuti pasave nekukukurwa kwehutachiona, huwandu hwakakodzera hwezvinhu zvinochengetedza hunofanira kuwedzerwa pajira racho. Zvinochengetedza zvinogona kudzivirira kukura kwezvipembenene, nokudaro zvichidzivirira zvinhu zvipenyu zvakaita se cellulose ether kuti zvisaora uye kuchengetedza kugadzikana kwejira racho. Zvinochengetedza zvakakodzera zvinofanirwa kusarudzwa zvichienderana nekugadzirwa kwejira uye nzvimbo yekuchengetera, uye kushanda kwazvo kunofanira kuongororwa nguva nenguva.
(4) Kudzora nzvimbo yekuchengetera zvinhu
Kupisa kwekuchengetedza uye hunyoro hwejira rine simba rakananga pakugadzikana kwe viscosity. Gwaro iri rinofanira kuchengetwa munzvimbo yakaoma uye inotonhorera, kudzivirira kupisa kwakanyanya uye hunyoro hwakawanda kuderedza solvent volatilization uye kuora kwe cellulose ether. Pamusoro pezvo, kurongedza kwakavharwa zvakanaka kunogona kuderedza kufamba uye kubuda kwemvura uye kunonotsa kudzikira kwe viscosity.
4. Zvimwe zvinhu zvinokanganisa viscosity
Pamusoro pe cellulose ethers, zvimwe zvikamu zviri mu coating system zvinogonawo kukanganisa kuchinja kwe viscosity. Semuenzaniso, mhando uye huwandu hwe pigments, volatilization rate ye solvents, uye compatibility yezvimwe zvinogocha kana dispersants zvinogona kukanganisa viscosity stability ye coating. Saka, dhizaini yese ye coating formula uye kudyidzana pakati pezvikamu zvakare zvinhu zvakakosha zvinofanirwa kutariswa.
Kudzikira kwe viscosity panguva yekuchengetwa kwependi kunoenderana zvakanyanya nezvinhu zvakaita sekuora kwe cellulose ethers, solvent volatilization, uye kufamba kwemvura. Kuti pave nekugadzikana kwekuchengetwa kwependi, mhando dzakakodzera dze cellulose ether dzinofanira kusarudzwa, pH yependi inofanira kudzorwa, matanho ekudzivirira ngura anofanira kusimbiswa, uye nzvimbo yekuchengetera inofanira kugadziriswa. Kuburikidza nekugadzira formula inonzwisisika uye manejimendi yakanaka yekuchengetedza, dambudziko rekuderera kwe viscosity panguva yekuchengetwa kwependi rinogona kuderedzwa zvinobudirira, uye mashandiro echigadzirwa uye kukwikwidzana kwemusika zvinogona kuvandudzwa.
Nguva yekutumira: Gunyana-27-2024