Hydroxyethyl cellulose (HEC) inonyungudika nemvura isiri-ionic cellulose ether. Inoshandiswa zvakanyanya mumvura-based coatings nekuda kwekunaka kwayo kukora, emulsifying, film-forming uye suspending properties. Seyakakora uye inodzikamisa mumajasi, HEC inogona kuvandudza zvakanyanya rheological zvivakwa uye kupenda kwekupfeka.
1. Mabasa makuru ehydroxyethyl cellulose
Mumvura-based coatings, iwo makuru mabasa eHEC anoratidzwa mune zvinotevera zvinhu:
Kukora mhedzisiro: HEC ine yakasimba thickening kugona, iyo inogona zvinobudirira kuvandudza viscosity uye kumiswa kugona kwemvura-based coatings uye kudzivirira pigment uye mafirita ari mujasi kuti asagadzika.
Kuvandudza rheology: HEC inogona kugadzirisa fluidity mumvura-based coatings kuitira kuti iratidze viscosity yakaderera pasi peshear yakakwirira, zvichiita kuti zvive nyore kupararira paunenge uchipenda, uchiratidzira viscosity yakakwirira pasi pemamiriro ekugadzirisa, nokudaro kuderedza kuyerera kwepende. hanging phenomenon.
Kuwedzeredzwa kugadzikana: HEC ine yakanaka yechando-thaw kuramba uye kugadzikana kwekuchengetedza, iyo inogona kuwedzera hupenyu hwesherufu hwemachira uye inovimbisa kugadzikana munzvimbo dzakasiyana.
Kuvandudza maitiro ekugadzira firimu: HEC inoumba firimu rinoshanduka mushure mokunge pende yaoma, ichiwedzera kunamatira uye kupfeka kupikisa kwefirimu yepende nekuvandudza kushanda kwekudzivirira kwepende.
2. Mashandisiro eHEC
Paunenge uchishandisa HEC mumvura-based coatings, nzira dzekuparadzira uye kuparara uye nzira dzekuwedzera dzakananga dzinowanzoshandiswa. Aya anotevera matanho ekushandisa uye matekiniki:
() 1. Pretreatment kuputsa HEC
HEC ihupfu iyo yakaoma kunyungudika zvakananga uye nyore inoumba clumps mumvura. Naizvozvo, usati wawedzera HEC, inokurudzirwa kufanoiparadzira. Matanho akajairika ndeaya anotevera:
Kurudzira uye uparadzire: Zvishoma nezvishoma wedzera HEC kumvura pasi pekukurumidza-kumhanyisa kumhanyisa kudzivirira kuumbwa kwe clumps. Huwandu hweHEC hwakawedzerwa hunofanirwa kugadziridzwa zvinoenderana nezvinodiwa viscosity yejasi, kazhinji inoverengera 0.3% -1% yeiyo yakazara formula.
Kudzivirira keke: Paunenge uchiwedzera HEC, zvishoma zvekudzivirira-caking agents, zvakadai se ethanol, propylene glycol, nezvimwewo, zvinogona kuwedzerwa kumvura kuitira kuti HEC powder iparadzwe zvakaenzana uye kuderedza mukana wekugadzira.
(2). Dispersion uye dissolution nzira
Iyo nzira yekuparadzira uye yekunyungudika ndeyekunyungudutsa HEC zvakasiyana muine viscous fluid panguva yekugadzirira kwepende, wozoiwedzera papende. Matanho chaiwo ndeaya anotevera:
Dissolution process: HEC yakaoma kunyungudika pane yakajairika kana yakaderera tembiricha, saka mvura inogona kupisa zvakakodzera kuti isvike kutonhora kwe30-40 ° C kukurumidza kupera kweHEC.
Nguva yekufambisa: HEC inonyungudika zvishoma nezvishoma uye kazhinji inoda kusveta kwemaawa 0.5-2 kusvikira yanyungudutswa zvachose muine yakajeka kana translucent viscous fluid.
Gadzirisa pH kukosha: Mushure mokunge HEC yanyungudutswa, pH kukosha kwekugadzirisa kunogona kugadziriswa maererano nezvinodiwa, kazhinji pakati pe7-9, kuvandudza kugadzikana kwekuputira.
(3). Nzira yekuwedzera yakananga
Iyo yakananga yekuwedzera nzira ndeyekuwedzera HEC yakananga mukati meiyo coating system panguva yekugadzira yekugadzira, iyo inokodzera machira ane akakosha maitiro zvinodiwa. Ndokumbira utarise kune zvinotevera pfungwa paunenge uchishanda:
Omesa kutanga wozonyorova: WedzeraHECkune chikamu chakaoma chependi yakagadzirwa nemvura kutanga, sanganisa pamwe chete nedzimwe poda, uye wobva wawedzera mvura uye zvikamu zvemvura kuti usasangana.
Kudzora kweshear: Paunenge uchiwedzera HEC kumucheka, zvakakosha kushandisa michina yekugadzira-shear yakasanganiswa, yakadai se-high-speed disperser, kuitira kuti HEC inogona kuparadzirwa zvakafanana munguva pfupi uye kusvika kune viscosity inoda.
3. Kudzora kweHEC dosage
Mumvura yakadzika-yakadzika, chiyero cheHEC chinofanira kudzorwa maererano nezvinodiwa chaizvo zvekupfeka. Yakawandisa HEC ichaita kuti iyo coating viscosity iwedzere uye inokanganisa kushanda; yakawandisa HEC inogona kusawana iyo inotarisirwa kukora maitiro. Mumamiriro ezvinhu akajairwa, kuyerwa kweHEC kunodzorwa pa 0.3% -1% yeiyo yakazara formula, uye iyo chaiyo chikamu chinogona kugadziriswa kuburikidza nekuedza.
4. Kuchengetedza kweHEC mumvura-based coatings
Dzivisa agglomeration: HEC inowanzoita agglomerate mumvura, saka kana uchiiwedzera, wedzera zvishoma nezvishoma sezvinobvira, iparadzire zvakaenzana, uye dzivirira kusanganiswa kwemhepo zvakanyanya sezvinobvira.
Dissolution tembiricha: HEC inonyungudika nekukurumidza pakupisa kwepamusoro, asi tembiricha haifanire kudarika 50 ° C, zvikasadaro viscosity yayo inogona kukanganiswa.
Mamiriro ezvinhu anokurudzira: Kuenderera mberi kunokurudzira kunodiwa panguva yekuparara kweHEC, uye midziyo ine zvivharo inofanira kushandiswa zvakanyanya sezvinobvira kudzivirira kusvibiswa kubva kunze kwekusvibiswa uye kubuda kwemvura.
Kugadziriswa kwepH kukosha: The viscosity yeHEC ichawedzera pasi pemamiriro e-alkaline, saka pH kukosha kwechigadziro kunoda kugadziriswa zvakakodzera kudzivirira kushanda kwekuputira kubva pakuderera nekuda kwepH yakawandisa.
Muedzo wekuenderana: Paunenge uchigadzira mafomula matsva, kushandiswa kweHEC kunofanirwa kuongororwa kuenderana nemamwe makobvu, emulsifiers, nezvimwe kuti ive nechokwadi chekuti hapana maitiro akashata achaitika.
5. Mienzaniso yekushandisa yeHEC mumvura-based coatings
HEC inogona kushandiswa seyakakora mune ese ari maviri-akavakirwa mukati memadziro machira uye mvura-yakavakirwa kunze kwemadziro emadziro. Semuyenzaniso:
Mvura-yakavakirwa mukati memadziro pendi: HEC inoshandiswa kuvandudza chiyero chependi, ichiita kuti chishandiso chive chakapfava uye chakatonyanya, uye kuderedza mabrashi mamaki.
Mvura-yakavakirwa kunze kwemadziro emadziro: HEC inogona kukwidziridza sag kuramba uye kupikisa kwemamiriro ekunze kwejasi uye kudzivirira kukuvadzwa kweiyo bhaisikopo rinokonzerwa nekukukurwa kwemvura.
Kushandiswa kweHEC mumvura-based coatings haigoni kungovandudza kushanda kwekuvaka kwekuputira, asiwo kunatsiridza unhu hunooneka uye kusimba kwefirimu yekuputira. Mumashandisirwo anoshanda, maererano nezvinodiwa chaizvo zvekuputira, nzira yekunyungudika uye huwandu hwekuwedzera hweHEC inosarudzwa zvine musoro, uye inosanganiswa nekugadzirira kwezvimwe zvinhu zvakasvibirira, mhedzisiro yekuputira yepamusoro inogona kuwanikwa.
Nguva yekutumira: Nov-10-2024