Hydroxyethylcellulose (HEC) isiri-ionic mvura-inonyungudika polima inoshandiswa zvakanyanya mumachira, zvizorwa, zvekuvakisa, mishonga uye mamwe maindasitiri. Basa rayo guru rakaita seyakakora, inomisa mumiriri, firimu-inogadzira agent uye stabilizer, iyo inogona kuvandudza zvakanyanya rheological maitiro echigadzirwa. HEC ine yakanaka solubility, thickening, film-forming uye kuenderana, saka inofarirwa muminda yakawanda. Zvisinei, maererano nekugadzikana kweHEC uye kushanda kwayo munzvimbo dzakasiyana-siyana dzepH, chinhu chinokosha chinofanira kutariswa mukushanda kwekushanda.
Panyaya yepH senitivity, hydroxyethylcellulose, senge isiri-ionic polymer, ine hunhu husina hanya nepH shanduko. Izvi zvakasiyana nemamwe ma ionic thickeners (akadai secarboxymethylcellulose kana mamwe ma acrylic polymers), ane mapoka eionic muzvikamu zvawo zvemolecular uye anowanzo paradzana kana ionization munzvimbo dzine acidic kana alkaline. , nokudaro inokanganisa kukora uye rheological properties yemhinduro. Nekuti HEC haina muripo, kukora kwayo mhedzisiro uye solubility zvivakwa zvinoramba zvakagadzikana pamusoro pehupamhi pH renji (kazhinji pH 3 kusvika pH 11). Iyi ficha inoita kuti HEC ienderane kune akasiyana masisitimu ekugadzira uye inogona kuita yakanaka thickening mhedzisiro pasi pe acidic, neutral kana kusimba alkaline mamiriro.
Kunyangwe HEC ine kugadzikana kwakanaka pasi pemamiriro mazhinji epH, kuita kwayo kunogona kukanganiswa munzvimbo dzakanyanyisa pH, dzakadai seyakanyanya acidic kana alkaline nharaunda. Semuenzaniso, pasi pemamiriro ezvinhu ane acidic zvakanyanya (pH <3), kunyungudika kweHEC kunogona kuderedzwa uye mhedzisiro yekukora inogona kunge isingave yakakosha seyakarerekera kana zvishoma acidic nharaunda. Izvi zvinodaro nekuti yakawandisa hydrogen ion concentration ichakanganisa kuumbwa kweHEC molecular chain, ichideredza kugona kwayo kupararira nekuzvimba mumvura. Saizvozvowo, pasi pemamiriro e-alkaline (pH> 11), HEC inogona kuderedzwa zvishoma kana kugadziriswa kwemakemikari, zvichiita kuti iwedzere.
Mukuwedzera kune solubility uye thickening migumisiro, pH inogonawo kukanganisa kuenderana kweHEC nezvimwe zvikamu zvekugadzira. Pasi penzvimbo dzakasiyana dzepH, zvimwe zvinoshandiswa zvinogona kuita ionize kana kuparadzanisa, nekudaro vachichinja kudyidzana kwavo neHEC. Semuenzaniso, pasi pemamiriro e acidic, mamwe maion simbi kana cationic inoshanda zvimisikidzo zvinogona kuumba macomplexes neHEC, zvichiita kuti kukora kwaro kuite simba kana kunaya. Nokudaro, mukugadzirisa kwekugadzirisa, kuwirirana pakati peHEC nezvimwe zvinoshandiswa pasi pemamiriro akasiyana epH zvinoda kutariswa kuti zvive nechokwadi chekugadzikana uye kushanda kwehurongwa hwose.
Kunyange zvazvo HEC pachayo isinganyanyi kutarisana nepH kuchinja, kupera kwayo uye kupera kwekugadzirisa kunogona kuchinjwa nepH. HEC inowanzonyungudika nekukurumidza pasi pekusarerekera kana zvishoma acidic mamiriro, nepo pasi peyakanyanya acidic kana alkaline mamiriro ekunyungudika kunogona kunonoka. Nokudaro, pakugadzirira zvigadziriswa, zvinowanzokurudzirwa kutanga kuwedzera HEC kune imwe nzvimbo isina kwayakarerekera kana iri pedyo-neutral aqueous solution kuti ive nechokwadi chokuti inonyungudika nekukurumidza uye zvakaenzana.
Hydroxyethylcellulose (HEC), senge isiri-ionic polymer, haina hanya nepH uye inogona kuchengetedza yakagadzikana gobvu mhedzisiro uye solubility zvivakwa pamusoro pehupamhi pH renji. Kuita kwayo kwakagadzikana muhuwandu hwepH 3 kusvika pH 11, asi munzvimbo dzakanyanyisa asidhi uye alkali, kukora kwayo uye kunyungudika kunogona kukanganisa. Nokudaro, paunoshandisa HEC, kunyange zvazvo kazhinji pasina chikonzero chekubhadhara zvakanyanya pH kuchinja, pasi pemamiriro ezvinhu akaoma, kuedza kwakakodzera uye kugadzirisa kuchiri kudiwa kuti kuve nechokwadi chekugadzikana uye kushanda kwehurongwa.
Nguva yekutumira: Oct-22-2024