Popeza kukhuthala kwa utomoni wopangidwa ndi madzi ndi kochepa kwambiri, sikungakwaniritse zosowa za kusungira ndi kumanga kwa chophimbacho, kotero ndikofunikira kugwiritsa ntchito chokhuthala choyenera kuti musinthe kukhuthala kwa chophimba chopangidwa ndi madzi kukhala momwe chilili choyenera.
Pali mitundu yambiri ya zokhuthala. Posankha zokhuthala, kuwonjezera pa kukhuthala kwawo komanso kuwongolera rheology ya zomatira, zinthu zina ziyenera kuganiziridwa kuti zomatirazo zikhale ndi magwiridwe antchito abwino kwambiri omangira, mawonekedwe abwino kwambiri a filimu yomatira komanso moyo wautali kwambiri wautumiki.
Kusankha mitundu yokhuthala kumadalira makamaka kufunikira ndi momwe zinthuzo zilili.
Posankha ndi kugwiritsa ntchito zothina, izi ndizofunikira.
1. HEC yolemera kwambiri ya mamolekyulu imakhala ndi kutsekeka kwakukulu poyerekeza ndi kulemera kochepa kwa mamolekyulu ndipo imawonetsa kukhuthala kwakukulu panthawi yosungira. Ndipo pamene kuchuluka kwa kumeta kumawonjezeka, mkhalidwe wozungulira umawonongeka, kuchuluka kwa kumeta kumawonjezeka, mphamvu ya kulemera kwa mamolekyulu imachepa. Njira yometa iyi sikugwirizana ndi zinthu zoyambira, utoto ndi zowonjezera zomwe zimagwiritsidwa ntchito, zimangofunika kusankha kulemera koyenera kwa mamolekyulu a cellulose ndikusintha kuchuluka kwa kumeta kumatha kupeza kukhuthala koyenera, motero kugwiritsidwa ntchito kwambiri.
2. HEUR thickener ndi madzi okhuthala okhala ndi diol kapena diol ether ngati co-solvent, okhala ndi 20% ~ 40%. Ntchito ya co-solvent ndikuletsa kumamatira, apo ayi zokhuthala zotere zimakhala mu gel state pamlingo womwewo. Nthawi yomweyo, kupezeka kwa solvent kumatha kupewa kuti mankhwalawa asazizire, koma ayenera kutenthedwa nthawi yozizira musanagwiritse ntchito.
3. Zinthu zolimba zochepa komanso zokhuthala pang'ono n'zosavuta kutaya ndipo zimatha kunyamulidwa ndikusungidwa mochuluka. Chifukwa chake, zinthu zina zokhuthala za HEUR zimakhala ndi zinthu zolimba zosiyana zomwe zimapezeka muzinthu zomwezo. Zinthu zosungunuka pamodzi zomwe zimapezeka muzinthu zokhuthala zochepa zimakhala zambiri, ndipo kukhuthala pakati pa utoto kumakhala kotsika pang'ono zikagwiritsidwa ntchito, zomwe zitha kuchepetsedwa pochepetsa kusungunuka komwe kumawonjezeredwa kwina mu kapangidwe kake.
4. Pansi pa mikhalidwe yoyenera yosakaniza, HEUR yocheperako imatha kuwonjezeredwa mwachindunji ku utoto wa latex. Pogwiritsa ntchito zinthu zokhuthala kwambiri, chokhuthalacho chiyenera kuchepetsedwa ndi madzi osakaniza ndi chosungunuka chisanawonjezedwe. Ngati muwonjezera madzi kuti muchepetse chokhuthalacho mwachindunji, chimachepetsa kuchuluka kwa chosungunuka choyambirira mu chinthucho, zomwe zidzawonjezera kumatirira ndikupangitsa kuti kukhuthala kukwere.
5. Kuwonjezera chokhuthala ku thanki yosakanizira kuyenera kukhala kokhazikika komanso pang'onopang'ono, ndipo kuyenera kuyikidwa m'mbali mwa thanki ya pakhoma. Liwiro lowonjezera siliyenera kukhala lachangu kwambiri kotero kuti chokhuthalacho chikhale pamwamba pa madzi, koma chiyenera kukokedwa mumadzi ndikuzunguliridwa mozungulira shaft yosakaniza, apo ayi chokhuthalacho sichidzasakanizidwa bwino kapena chokhuthalacho chidzakhuthala kwambiri kapena kugwedezeka chifukwa cha kuchuluka kwa madzi m'deralo.
6. Chokhuthala cha HEUR chimawonjezedwa mu thanki yosakanizira utoto pambuyo pa zinthu zina zamadzimadzi komanso musanalowetsedwe, kuti zitsimikizire kuti kuwala kwake kuli kokwanira.
7. Zipangizo zothina za HASE zimawonjezedwa mwachindunji ku utoto mu mawonekedwe a emulsion popanga utoto wa emulsion popanda kusungunuka kale kapena kusungunuka kale. Zitha kuwonjezeredwa ngati gawo lomaliza mu gawo losakaniza, mu gawo logawanitsa utoto, kapena ngati gawo loyamba mu kusakaniza.
8. Popeza HASE ndi emulsion yokhala ndi asidi wambiri, ikawonjezeredwa, ngati pali alkali mu utoto wa emulsion, idzapikisana ndi alkali iyi. Chifukwa chake, ndikofunikira kuwonjezera emulsion yothina ya HASE pang'onopang'ono komanso mosalekeza, ndikusakaniza bwino, apo ayi, ipanga dongosolo logawanitsa utoto kapena emulsion binder kusakhazikika, ndipo yomaliza imakhazikika ndi gulu losasinthika la pamwamba.
9. Alkali ikhoza kuwonjezeredwa musanawonjezere kapena mutawonjezera chinthu chokhuthala. Ubwino wowonjezera musanawonjezere ndikuwonetsetsa kuti palibe kusakhazikika kwa malo osakanikirana kwa utoto kapena cholumikizira cha emulsion komwe kudzachitike chifukwa chokhuthala chikutenga alkali kuchokera pamwamba pa utoto kapena cholumikizira. Ubwino wowonjezera alkali pambuyo pake ndikuti tinthu tating'onoting'ono timafalikira bwino tisanatuluke kapena kusungunuka ndi alkali, zomwe zimaletsa kukhuthala kapena kusonkhana kwa malo, kutengera kapangidwe kake, zida ndi njira zopangira. Njira yotetezeka kwambiri ndikusungunula chokhuthala cha HASE ndi madzi kaye kenako ndikuchichotsa ndi alkali pasadakhale.
10. Chokhuthala cha HASE chimayamba kutupa pa pH ya pafupifupi 6, ndipo mphamvu yokoka imayamba kugwira ntchito mokwanira pa pH ya 7 mpaka 8. Kusintha pH ya utoto wa latex kukhala pamwamba pa 8 kungathandize kuti pH ya utoto wa latex isachepe pansi pa 8, motero kuonetsetsa kuti kukhuthala kwa utoto kukhazikika.
Nthawi yotumizira: Ogasiti-05-2022