Putty powder e sebelisoa haholo-holo bakeng sa ho lekanya le ho lokisa marako nakong ea kaho. Leha ho le joalo, phofo ea setso ea putty e atisa ho qhibiliha le ho nolofala ha e pepesehetse metsi, e ama boleng ba kaho le bophelo ba tšebeletso ea mohaho. Hydroxypropyl methylcellulose (HPMC), e le tlatsetso ea bohlokoa, e ka ntlafatsa haholo ho hanyetsa metsi a putty powder.
1. Lintho tsa lik'hemik'hale le mesebetsi ea motheo ea HPMC
Hydroxypropyl methylcellulose (HPMC) ke ether e seng ionic cellulose e nang le mesebetsi e fapaneng e kang ho teteana, ho etsa filimi, ho tsitsisa le ho kolobisa. E sebelisoa haholo ka thepa ea mohaho, meriana, lijo le masimo a mang. Sebopeho sa limolek'hule sa HPMC se na le lihlopha tsa hydrophilic hydroxyl (-OH) le lihlopha tsa hydrophobic hydrocarbon (-CH3, -CH2-), e fanang ka ho qhibiliha ha metsi hantle le botsitso. Thepa ena e thusa HPMC ho theha litharollo tse tsitsitseng tsa colloidal ka metsing le ho hlahisa sebopeho sa marang-rang se teteaneng nakong ea ts'ebetso ea ho folisa, ka hona ho ntlafatsa thepa ea 'mele ea thepa.
2. Mokhoa oa ho ntlafatsa ho hanyetsa metsi
2.1. Phello e teteaneng
HPMC e ka eketsa haholo viscosity ea putty powder slurry, e lumellang slurry ho theha mokhoa o tsitsitseng oa ho emisa ka metsing. Ka lehlakoreng le leng, phello ena e teteaneng e ntlafatsa ts'ebetso ea kaho ea slurry mme e fokotsa ts'ebetso ea delamination le mali; ka lehlakoreng le leng, ka ho etsa slurry ea viscous, HPMC e fokotsa sekhahla sa ho kenella ha limolek'hule tsa metsi, kahoo e ntlafatsa katleho ea putty powder. Ho hanyetsa metsi ka mor'a ho phekola.
2.2. Lintho tsa ho etsa lifilimi
Nakong ea ho folisa phofo ea putty, HPMC e tla theha filimi e teteaneng pakeng tsa samente, metsi le lisebelisoa tse ling. Lera lena le na le sekhahla se tlase sa phetisetso ea mouoane oa metsi mme se ka thibela ka nepo ho kenella ha mongobo. Filimi e entsoeng ke HPMC e ka boela ea ntlafatsa matla a mochine le ho roala ho hanyetsa ha thepa, ho ntlafatsa ho thibela metsi ha putty powder.
2.3. Ntlafatsa khanyetso ea crack
Ka ho ntlafatsa modulus ea elastic le thepa ea shrinkage ea putty powder, HPMC e ka fokotsa ka katleho kotsi ea ho phatloha ho bakoang ke ho fokotseha ho omileng le ho fetoha ha mocheso. Ho fokotsa ho hlaha ha mapetsong ho tla boela ho thuse ho ntlafatsa ho hanyetsa metsi a putty powder, hobane mapetsong a tla fetoha litsela tse ka sehloohong tsa ho kenella ha metsi.
2.4. Taolo ea hydration reaction
HPMC e ka liehisa tekanyo ea hydration reaction ea samente, e lumella phofo ea putty hore e be le nako e telele ea ho ipholisa le ho tiisa nakong ea ho thatafala. Karabelo e liehang ea hydration e thusa ho theha microstructure e teteaneng, ka hona ho fokotsa porosity ea phofo ea putty le ho ntlafatsa ts'ebetso e sa keneleng metsi ea thepa.
3. Tšebeliso ea ts'ebeliso ea HPMC ka putty powder
3.1. Ntlafatsa tshebetso ya kaho
HPMC e ntlafatsa thepa ea rheological ea putty slurry, e nolofaletsa basebetsi ba kaho ho etsa ts'ebetso ea ho hohola le ho thella. Ka lebaka la thepa ea eona e babatsehang ea ho tiisa le ho boloka metsi, putty powder e ka boloka boemo bo loketseng ba mongobo ha e sebelisoa, ho fokotsa ho hlaha ha mapetsong a omileng le ho ntlafatsa boleng ba mohaho.
3.2. Ntlafatsa thepa ea mochini ea lihlahisoa tse felileng
Putty phofo e kentsoeng ka HPMC e na le matla a phahameng a mochine le ho khomarela ka mor'a ho folisa, ho fokotsa monyetla oa ho phunyeha le ho ebola. Sena se ntlafatsa haholo botle ka kakaretso le ho tšoarella ha mohaho.
3.3. Ntlafatsa ho hanyetsa metsi a ho roala ho qetela
Liteko li bontša hore matla a putty powder a ekelitsoeng ka HPMC a fokotseha hanyenyane ka mor'a ho kolobisoa ka metsing, 'me a bontša ho hanyetsa ha hydrolysis le botsitso. Sena se etsa hore putty powder e sebelise HPMC e loketseng haholoanyane litlhoko tsa kaho libakeng tse mongobo.
4. Litlhokomelo tsa ts'ebeliso
Leha HPMC e na le phello e kholo ho ntlafatseng ho hanyetsa metsi ha putty powder, lintlha tse latelang li lokela ho hlokomeloa lits'ebetsong tse sebetsang:
4.1. Khetha litekanyetso ka nepo
Tekanyo ea HPMC e hloka ho lokisoa ka mokhoa o utloahalang ho latela litlhoko tsa foromo le kaho ea phofo ea putty. Tšebeliso e feteletseng e ka 'na ea etsa hore slurry e be viscous haholo, e amang mesebetsi ea kaho; tšebeliso e sa lekaneng e ka 'na ea se ke ea hlahisa liphello tsa eona tse teteaneng le ho etsa filimi.
4.2. Synergy le li-additives tse ling
Hangata HPMC e sebelisoa hammoho le li-cellulose ethers tse ling, phofo ea latex, li-plasticizers le li-additives tse ling ho finyella liphello tse molemo ka ho fetisisa. Khetho e loketseng le ho bapisa li-additives tsena ho ka ntlafatsa ts'ebetso e akaretsang ea putty powder.
4.3. Laola mocheso oa tikoloho le mongobo
Thepa ea ho boloka metsi ea HPMC e ka ameha ha e sebelisoa mocheso o phahameng kapa tikolohong ea mongobo o tlase. Kaho e lokela ho etsoa tlas'a maemo a loketseng a mocheso le mongobo ka hohle kamoo ho ka khonehang, 'me tlhokomelo e lokela ho lefshoa ho boloka mongobo oa slurry.
HPMC e ntlafatsa ka katleho ho hanyetsa metsi ha putty powder ka mekhoa e mengata e kang ho teteaneng, ho thehoa ha filimi, ho ntlafatsa ho hanyetsa ha crack le ho laola karabelo ea hydration, e leng ho lumellang hore e bontše botsitso bo babatsehang le ho tšoarella libakeng tse mongobo. Sena ha se ntlafatse feela boleng le katleho ea mohaho oa mohaho, empa hape se eketsa bophelo ba tšebeletso ea mohaho. Lits'ebetsong tse sebetsang, khetho e utloahalang le tšebeliso ea HPMC le li-additives tse ling li ka ntlafatsa ts'ebetso ea putty powder le ho finyella liphello tsa boleng bo phahameng ba kaho.
Nako ea poso: Jun-26-2024