I-HEC kushishino lwezogquma

I-Hydroxyethyl cellulose (HEC)sisixhobo sepolymer esibalulekileyo esingenakunyibilika emanzini esingeyiyo ionic, esilungiswa ngokunyanga i-cellulose yendalo nge-alkali kwaye siphendula nge-ethylene oxide. Njenge-arhente esebenza ngemisebenzi emininzi, eqinisayo, eqinayo kwaye eyenza ifilimu, i-HEC isetyenziswa kakhulu kushishino lwe-coating. Iipropati zayo ezintle ze-rheological, ukuhambelana kakuhle kwezinto eziphilayo kunye neepropati zeekhemikhali ezizinzileyo zenza ukuba ibe yinxalenye ebalulekileyo ebalulekileyo kwi-coating formulations zanamhlanje.

1. Iimpawu ezisisiseko ze-HEC

I-HEC inokunyibilika kakuhle kwamanzi kwaye inokunyibilika ngokukhawuleza emanzini abandayo okanye ashushu ukuze yenze isisombululo se-colloidal esicacileyo nesizinzileyo. I-viscosity yesisombululo sayo ichaphazeleka kakhulu zizinto ezifana noxinzelelo lwesisombululo, ubushushu, kunye nesantya sokucheba, kwaye ibonisa ukuziphatha okuqhelekileyo kokuhamba kwe-pseudoplastic (oko kukuthi, iimpawu zokunciphisa ukucheba). Ukongeza, i-HEC inozinzo oluhle kuluhlu olubanzi lwe-pH (2–12), inyamezela ngamandla ii-electrolytes, kwaye ayonakaliswa lula ziintsholongwane (izigcini zihlala zongezwa ukuphucula uzinzo lokugcina).

Iingenelo eziphambili zokusebenza kwe-HEC ziquka:

Isiphumo sokutyeba: Yonyusa ubungqindilili benkqubo yokugquma kwaye iphucule ukusebenza kolwakhiwo lwengubo.

Ulawulo lwe-Rheological: phucula iipropati zokuwa kunye nokulinganisa kwengubo.

Ukugcinwa kwamanzi: kuthintela amanzi ukuba angatshi ngokukhawuleza ngexesha lokwakhiwa kwaye kuphucule umgangatho wefilimu.

Uzinzo: gcina uzinzo lwefomyula phantsi kweemeko ezahlukeneyo zokusingqongileyo.

Ukusasazeka: kunceda iipigment kunye nezizalisi ukuba zisasazeke ngokulinganayo kwaye zithintele ukuna kwemvula kunye nokuqubha.

2. Ukusetyenziswa kwe-hydroxyethyl cellulose kushishino lokufaka i-coating

Kwishishini lokugquma, ingakumbi kwicandelo lokugquma okusekelwe emanzini, i-HEC isetyenziswa kakhulu, ikakhulu kwezi nkalo zilandelayo:

(1) Njengesithambisi-mafutha

I-HEC inokunyusa ngempumelelo i-viscosity iyonke yenkqubo yokugquma esekwe emanzini kwaye inike i-thixotropy elungileyo yokugquma. Ubungakanani obufanelekileyo be-HEC bunokuthintela i-coating ukuba ingawi ngexesha lokuxukuxa, ukugquma nge-roller okanye ukutshiza, kwaye buncede ukuphucula ukugcwala kunye nokufana kwefilimu yokugquma. Ukongeza, iipropati zokunciphisa i-shear ze-HEC zonyusa ukugeleza kwe-coating xa kusetyenziswa amandla angaphandle (njengokuxukuxa, ukutshiza), kwaye i-viscosity iyabuyiselwa xa imile ukuthintela ukugoba.

(2) Uhlengahlengiso lweempawu ze-Rheological

I-Rheology yenye yezona zinto zibalulekileyo ezibonisa ukusebenza kakuhle kwe-coating esekelwe emanzini. I-HEC ilungisa uxinzelelo lwe-yield kunye ne-flow curve ye-coating ukuze ifumane ukuhamba kakuhle kunye neempawu zokusasazeka phantsi kweendlela ezahlukeneyo zokwakha. Ingakumbi kwi-content-solid and high-viscosity formulations, i-HEC inokubonelela ngemvakalelo yokwakhiwa kunye nokulinganisa okuhle, iphucule ukusebenza kakuhle kwe-coating kunye nomgangatho we-coating.

(3) Indima yozinziso kunye neyomsasazi

Kwindlela yokwenziwa kwengubo, ukusasazeka okuzinzileyo kweepigment kunye nezizalisi kubalulekile ekuzinzeni kokugcinwa kunye nomgangatho wengubo. I-HEC inokwenza umaleko okhuselayo kumphezulu wee-particles ukuthintela ukuhlanganiswa kunye nokutsalwa kwee-pigment. Kwangaxeshanye, ngokunyusa i-viscosity yenkqubo, inciphisa ngakumbi izinga lokutsalwa kwee-particles, ngaloo ndlela iphucula uzinzo lokugcina kunye nokufana kombala wengubo.

(4) Ukuphucula ukugcinwa kwamanzi kunye neempawu zokwenza ifilimu

I-HEC inomthamo obalaseleyo wokugcina amanzi. Ingathintela ukufuma kwamanzi ngokukhawuleza ngexesha lenkqubo yokwakha, nto leyo eluncedo ekusasazekeni kweepigment, ukuqhubeka kokwenza ifilimu kunye nokuphucula ukusebenza kokugqibela kokufaka. Ingakumbi xa isetyenziswa kubushushu obuphezulu, izinto ezomileyo okanye ezinemingxuma, i-HEC inokuphucula kakhulu inkangeleko kunye nokugudama kokufaka.

3. Izinto eziphambili ezichaphazela ukusebenza kwe-HEC

Kwizicelo ezithile, ukusebenza kwe-HEC kuchatshazelwa zezi zinto zilandelayo:

Inqanaba lokutshintshwa (DS) kunye nokutshintshwa kwe-molar (MS): I-DS imele inani lamaqela e-hydroxyl atshintshiweyo kwiyunithi nganye yeglucose, kwaye i-MS imele inani eliqhelekileyo lamaqela e-hydroxyethyl angeniswa kwiyunithi nganye yeglucose. Ngokubanzi, ixabiso le-DS liphezulu, kokukhona ukunyibilika kwe-HEC kuphezulu; okukhona ixabiso le-MS liphezulu, kokukhona ukumelana netyuwa kunye nokumelana nobushushu kuphucuka.

Ubunzima beemolekyuli: Okukhona ubunzima beemolekyuli buphezulu, kokukhona isiphumo sokutyeba se-HEC siqina, kodwa ixesha lokunyibilika nalo lihlala ixesha elide. Iimeko ezahlukeneyo zokusetyenziswa (ezifana neengubo zodonga, iingubo zemizi-mveliso) zineemfuno ezahlukeneyo zobunzima beemolekyuli.

Unyango lomphezulu: Ukuze kuphuculwe ukusasazeka kwe-HEC emanzini abandayo ngoko nangoko, ezinye iimveliso ze-HEC zinyangwa kumphezulu ukuze zinyibilike ngokukhawuleza emanzini abandayo kwaye kuncitshiswe ukuhlangana okwenzeka ngexesha lokunyibilika.

4. Imizekelo yesicelo

Kwizinto zokugquma izakhiwo ezifana nepeyinti yelatex yodonga lwangaphakathi kunye nepeyinti yokutshintsha udonga lwangaphandle, i-HEC isetyenziswa njengearhente ephambili yokulawula ukuqina kunye ne-rheology, engaphuculi nje kuphela ukuguda kolwakhiwo, kodwa ikwaphucula nefuthe lokungagugi kunye nokuhombisa kwento yokugquma. Kwimida yempahla yoshishino, izinto zokugquma zomthi, ii-inki zokuprinta, njl.njl., i-HEC ikwasetyenziswa kakhulu ngenxa yokuzinza kwayo okuhle kunye nokuhambelana kwayo.

I-Hydroxyethyl cellulose ibe yinto encedisayo neyimfuneko kuyilo lwemilo yokufakelwa kwezinto ezisekelwe emanzini ngenxa yeempawu zayo ezibalaseleyo ezibanzi ezifana nokuqina, ulawulo lwe-rheology, ukugcinwa kwamanzi kunye nozinzo lokusasazeka. Ngenxa yemithetho yokusingqongileyo engqongqo ngakumbi kunye nesidingo esikhulayo sezinto ezisekelwe emanzini, amathuba okusetyenziswa kweI-HEC kushishino lwezogqumakuya kuba banzi. Kwixesha elizayo, uphuhliso lweemveliso ze-HEC ezinokunyibilika ngcono, ukumelana nemozulu engcono kunye nokusebenza okunamandla kuya kuba yenye yeendlela ezibalulekileyo zokuvelisa ubuchwepheshe kwishishini leengubo.