Mu utoto weniweni wa miyala, kodi hydroxypropyl methylcellulose ingagwiritsidwe ntchito m'malo mwa hydroxyethyl cellulose?

Mavitamini onse amachokera ku thonje lachilengedwe kapena phala lamatabwa, lomwe limapangidwa kudzera mu etherification. Ma cellulose osiyanasiyana amagwiritsa ntchito zinthu zosiyanasiyana zotenthetsera. Chothandizira kutentha chomwe chimagwiritsidwa ntchito mu hydroxyethyl cellulose (HEC) ndi ethylene oxide, ndipo chothandizira kutentha chomwe chimagwiritsidwa ntchito mu hydroxypropyl methylcellulose (HPMC) ndi mitundu ina ya zinthu zotenthetsera. (chloromethane ndi propylene oxide).

Mu utoto weniweni wa szone ndi utoto wa latex, hydroxyethyl cellulose ingagwiritsidwe ntchito ngati chokhuthala.

Utoto weniweni wa miyala ndi wosavuta kuupanga chifukwa cha kuchuluka kwake kwakukulu komanso kudziwika kwake kwakukulu. Ndikofunikira kuwonjezera chokhuthala kuti chiwonjezere kukhuthala kwake kuti chikwaniritse kukhuthala komwe kumafunika popopera panthawi yomanga, kukulitsa kukhazikika kwake, komanso kukhala ndi mphamvu inayake.

Ngati mukufuna kuti utoto weniweni wa miyala ukhale wolimba, wotetezeka ku madzi komanso wotetezeka ku nyengo, kusankha zipangizo zopangira ndi kapangidwe kake ndikofunikira kwambiri.

Muzochitika zachizolowezi, kuchuluka kwa emulsion komwe kumagwiritsidwa ntchito mu utoto weniweni wa miyala kudzakhala kwakukulu.

Mwachitsanzo, mu utoto weniweni wa miyala, pakhoza kukhala 300kg ya emulsion yoyera ya acrylic ndi 650kg ya mchenga wachilengedwe wamitundu yosiyanasiyana. Pamene kuchuluka kwa emulsion kuli 50%, kuchuluka kwa 300kg ya emulsion pambuyo pouma ndi pafupifupi malita 150, ndipo kuchuluka kwa 650kg ya mchenga ndi pafupifupi malita 228. Izi zikutanthauza kuti, PVC (pigment volume concentration) ya utoto weniweni wa miyala ndi 60% panthawiyi, chifukwa tinthu ta mchenga wamitundu yosiyanasiyana ndi tambiri komanso tosakhazikika, ndipo malinga ndi kufalikira kwa tinthu tating'onoting'ono, utoto weniweni wa miyala wouma ukhoza kukhala mu CPVC (critical mass concentration). Pigment volume concentration) pafupifupi. Ponena za thickener, ngati musankha cellulose yokhala ndi viscosity yoyenera, utoto weniweni wa miyala ukhoza kupanga filimu yodzaza komanso yokhuthala kuti ikwaniritse zofunikira zitatu zazikulu za utoto weniweni wa miyala. Ngati kuchuluka kwa utoto weniweni wa miyala kuli kochepa, tikulimbikitsidwa kugwiritsa ntchito cellulose yokhala ndi kukhuthala kwakukulu ngati chokhuthala (monga kukhuthala 100,000), makamaka mtengo wa cellulose ukakwera, zomwe zingachepetse kuchuluka kwa cellulose yomwe imagwiritsidwa ntchito ndikupanga mwala weniweni. Kuchita bwino kwa utoto kumakhala bwino.

Opanga utoto weniweni wa miyala otsika mtengo amagwiritsa ntchito hydroxypropyl methylcellulose m'malo mwa hydroxyethyl cellulose pamtengo wake ndi zinthu zina.

Poyerekeza ndi mitundu iwiri ya cellulose, hydroxyethyl cellulose imakhala ndi madzi abwino, sidzataya madzi chifukwa cha gelatin kutentha kwambiri, ndipo imakhala ndi kukana kwa mildew. Pofuna kuganizira za magwiridwe antchito, tikulimbikitsidwa kugwiritsa ntchito hydroxyethyl cellulose yokhala ndi kukhuthala kwa 100,000 ngati chokhuthala cha utoto weniweni wa miyala.