Mu utoto weniweni wamwala, kodi hydroxypropyl methylcellulose angagwiritsidwe ntchito m'malo mwa hydroxyethyl cellulose?

Mavitamini onse amachokera ku zamkati za thonje lachilengedwe kapena zamkati zamatabwa, zomwe zimapangidwa kudzera mu etherification. Mitundu yosiyanasiyana ya cellulose imagwiritsa ntchito ma etherifying osiyanasiyana. Etherifying agent yomwe imagwiritsidwa ntchito mu hydroxyethyl cellulose (HEC) ndi ethylene oxide, ndipo etherifying agent yomwe imagwiritsidwa ntchito mu hydroxypropyl methylcellulose (HPMC) ndi mitundu ina ya etherifying agents. (Chloromethane ndi propylene oxide).

Mu utoto weniweni wa szone ndi utoto wa latex, hydroxyethyl cellulose itha kugwiritsidwa ntchito ngati thickener.

Utoto weniweni wamwala ndi wosavuta kugwa chifukwa cha kuchuluka kwake kophatikizana komanso kutsimikizika kwakukulu. M'pofunika kuwonjezera thickener kuonjezera mamasukidwe akayendedwe ake kukakumana mamasukidwe akayendedwe chofunika kupopera mbewu mankhwalawa pomanga, kusintha kusunga kwake bata, ndi kukwaniritsa mphamvu inayake.

Ngati mukufuna utoto weniweni wamwala kuti mukwaniritse mphamvu zabwino, kukana madzi abwino ndi kukana kwa nyengo, kusankha kwa zipangizo ndi mapangidwe a ndondomekoyi ndizofunikira kwambiri.

Muzochitika zachilendo, kuchuluka kwa emulsion komwe kumagwiritsidwa ntchito mu utoto weniweni wamtengo wapatali kudzakhala kwakukulu.

Mwachitsanzo, mu toni ya utoto weniweni wamwala, pakhoza kukhala 300kg ya emulsion yoyera ya acrylic ndi 650kg yamchenga wamwala wachilengedwe. Pamene olimba zili emulsion ndi 50%, voliyumu 300kg wa emulsion pambuyo kuyanika pafupifupi 150 malita, ndi buku la 650kg mchenga pafupifupi 228 malita. Izi zikutanthauza kuti, PVC (pigment volume concentration) ya utoto weniweni wamwala ndi 60% panthawiyi, chifukwa mchenga wachikuda ndi waukulu komanso wosasinthasintha, ndipo pansi pa chikhalidwe cha kugawa kwa tinthu tating'onoting'ono, zouma zouma. utoto weniweni wamwala ukhoza kukhala mu CPVC (critical mass concentration). Pigment volume concentration) pafupifupi. Ponena za thickener, ngati mumasankha mapadi ndi viscosity yoyenera, utoto weniweni wamwala ukhoza kupanga filimu ya utoto yokwanira komanso wandiweyani kuti ikwaniritse zofunikira zazikulu zitatu za utoto weniweni wa miyala. Ngati zili mwala weniweni utoto emulsion ndi otsika, tikulimbikitsidwa kugwiritsa ntchito mapadi ndi kukhuthala apamwamba monga thickener (monga 100,000 mamasukidwe akayendedwe kukhuthala), makamaka mtengo wa mapadi ukuwonjezeka, amene akhoza kuchepetsa kuchuluka kwa mapadi ntchito ndi kupanga mwala weniweni Ntchito ya utoto ndi yabwino.

Ena opanga utoto weniweni wamtengo wapatali amagwiritsa ntchito hydroxypropyl methylcellulose m'malo mwa hydroxyethyl cellulose pamtengo ndi zina.

Poyerekeza ndi mitundu iwiri ya cellulose, hydroxyethyl cellulose imakhala ndi madzi osungira bwino, sataya kusungirako madzi chifukwa cha gelatin pa kutentha kwakukulu, ndipo imakhala ndi kukana kwa mildew. Poganizira magwiridwe antchito, tikulimbikitsidwa kugwiritsa ntchito hydroxyethyl cellulose yokhala ndi viscosity ya 100,000 ngati chokhuthala cha utoto weniweni wamwala.