nkhani

Popeza kukhuthala kwa utomoni wopangidwa ndi madzi kumakhala kochepa kwambiri, sikungathe kukwaniritsa zofunikira zosungirako ndi kumanga ntchito yopangira zokutira, choncho m'pofunika kugwiritsa ntchito thickener yoyenera kusintha makulidwe a zokutira zokhala ndi madzi kuti zikhale zoyenera.

Pali mitundu yambiri ya thickeners.Posankha zokhuthala, kuwonjezera pa kukhuthala kwawo komanso kuwongolera ma rheology, zinthu zina ziyenera kuganiziridwa kuti zokutirazo zikhale ndi ntchito yabwino yomanga, mawonekedwe owoneka bwino opaka filimu komanso moyo wautali wautumiki.

Kusankhidwa kwa mtundu wa thickener makamaka kumatengera kufunikira komanso momwe zinthu zilili pakupanga.

Posankha ndi kugwiritsa ntchito thickeners, izi ndi zofunika.

1. Kulemera kwa molekyulu ya HEC kumakhala ndi kutsekeka kwakukulu poyerekeza ndi kulemera kochepa kwa maselo ndipo kumawonetsa kuwonjezereka kwakukulu pakusungirako.Ndipo pamene kumeta ubweya wa ubweya ukuwonjezeka, malo okhotakhota amawonongeka, kuchuluka kwa kumeta ubweya wa ubweya, kumachepetsanso mphamvu ya molekyulu pa viscosity.Izi thickening limagwirira alibe chochita ndi m'munsi zakuthupi, inki ndi zina ntchito, ayenera kusankha bwino maselo kulemera kwa mapadi ndi kusintha ndende ya thickener akhoza kupeza mamasukidwe akayendedwe bwino, motero ambiri.

2.HEUR thickener ndi viscous aqueous solution ndi diol kapena diol ether monga co-solvent, ndi zolimba za 20% ~ 40%.Udindo wa co-solvent ndi kuletsa adhesion, apo ayi thickeners amenewa ali mu gel osakaniza boma pa ndende yomweyo.Pa nthawi yomweyo, pamaso pa zosungunulira angapewe mankhwala kuzizira, koma ayenera analimbikitsa m'nyengo yozizira pamaso ntchito.

3. Mankhwala otsika kwambiri, otsika kwambiri a viscosity ndi osavuta kutaya ndipo amatha kunyamulidwa ndikusungidwa zambiri.Chifukwa chake, ma thickeners ena a HEUR amakhala ndi zolimba zosiyanasiyana zomwe zimaperekedwa.Zomwe zimakhala zosungunulira zazitsulo zotsika kwambiri za viscosity thickeners ndi zapamwamba, ndipo kukhuthala kwapakati pa kumeta ubweya wa utoto kudzakhala kochepa pang'ono pamene kugwiritsidwa ntchito, komwe kungathe kuthetsedwa mwa kuchepetsa kusungunula kophatikizana komwe kumawonjezeredwa kwinakwake popanga.

4. Pansi pa kusakaniza koyenera, kutsika kwa viscosity HEUR ikhoza kuwonjezeredwa mwachindunji ku utoto wa latex.Mukamagwiritsa ntchito zinthu za viscosity yayikulu, chokhuthalacho chiyenera kuchepetsedwa ndi madzi osakaniza ndi zosungunulira zisanayambe kuwonjezeredwa.Ngati muwonjezera madzi kuti muchepetse thickener mwachindunji, zidzachepetsa kuchuluka kwa zosungunulira zapachiyambi mu mankhwala, zomwe zidzawonjezera kumamatira ndikupangitsa kuti mamasukidwe akayendedwe akwere.

5. Kuonjezera chokhuthala mu thanki yosanganikirana kuyenera kukhala kokhazikika komanso kochedwa, ndipo kuyikidwa pambali pa thanki ya khoma.Liwiro lowonjezera lisakhale lachangu kwambiri kotero kuti chokhuthalacho chimakhala pamwamba pa madziwo, koma chikokedwe mumadzimadzi ndikuzunguliridwa pansi mozungulira tsinde logwedeza, apo ayi chokhuthalacho sichingasakanizidwe bwino kapena chokhuthala chidzakhala chokhuthala kwambiri. kapena flocculated chifukwa cha kuchuluka kwa m'deralo.

6. HEUR thickener amawonjezeredwa ku tanki yosakaniza utoto pambuyo pa zigawo zina zamadzimadzi komanso pamaso pa emulsion, kuti atsimikizire kuti gloss pazipita.

7. HASE thickeners amawonjezedwa mwachindunji ku utoto mu mawonekedwe a emulsion popanga utoto wa emulsion popanda kuchepetsedwa kusanachitike kapena kusalowerera ndale.Ikhoza kuwonjezeredwa ngati gawo lotsiriza mu gawo losakanikirana, mu gawo la kubalalitsidwa kwa pigment, kapena ngati gawo loyamba la kusanganikirana.

8. Popeza HASE ndi emulsion yapamwamba ya asidi, atatha kuwonjezera, ngati pali alkali mu utoto wa emulsion, idzapikisana ndi alkali iyi.Choncho, m'pofunika kuwonjezera HASE thickener emulsion pang'onopang'ono ndi pang'onopang'ono, ndi kusonkhezera bwino, apo ayi, izo zidzapanga pigment kubalalitsidwa dongosolo kapena emulsion binder m'deralo Kusakhazikika, ndipo chotsirizira ndi okhazikika ndi neutralized padziko gulu.

9. Alkali ikhoza kuwonjezeredwa isanayambe kapena itatha kuwonjezeredwa.Ubwino kuwonjezera pamaso ndi kuonetsetsa kuti m'deralo Kusakhazikika kwa pigment kubalalitsidwa kapena emulsion binder adzakhala chifukwa cha thickener tagwira alkali kuchokera pamwamba pigment kapena binder.Ubwino wowonjezera zamchere pambuyo pake ndikuti tinthu tating'onoting'ono timabalalika bwino tisanatupike kapena kusungunuka ndi alkali, kuteteza kufalikira kwa m'deralo kapena kuphatikizika, kutengera kapangidwe kake, zida ndi njira zopangira.Njira yabwino kwambiri ndiyo kusungunula chokhuthala cha HASE ndi madzi kaye ndikuchichepetsa ndi alkali pasadakhale.

10. HASE thickener imayamba kutupa pa pH pafupifupi 6, ndipo kukhuthala bwino kumayamba kusewera pa pH ya 7 mpaka 8. Kusintha pH ya utoto wa latex kufika pamwamba pa 8 kungapangitse pH ya utoto wa latex kuti isatsike pansi pa 8. , motero kuonetsetsa kukhazikika kwa viscosity.