Focus on Cellulose ethers

Seretse se seng se lokisitsoe ke eng?

Seretse se kopantsoeng se itokiselitseng se arotsoe ka seretse se motsoako o metsi le seretse se omileng se omileng ho latela mokhoa oa tlhahiso.Motsoako o motsoako o metsi o kopantsoeng le metsi o bitsoa seretse se kopantsoeng le metsi, 'me motsoako o tiileng o entsoeng ka thepa e omeletseng o bitsoa seretse se omileng.Ho na le lisebelisoa tse ngata tse tala tse amehang ka seretse se seng se lokisitsoe.Ntle le lisebelisoa tsa samente, li-aggregates le metsoako ea liminerale, metsoako e hloka ho kenyelletsoa ho ntlafatsa polasetiki ea eona, ho boloka metsi le ho tsitsisa.Ho na le mefuta e mengata ea li-admixtures bakeng sa seretse se kopantsoeng se lokiselitsoeng, se ka aroloa ka selulose ether, starch ether, redispersible latex powder, bentonite, joalo-joalo ho tsoa ho lik'hemik'hale;e ka aroloa ka moea-entraining agent, stabilizer, anti-cracking fiber, Retarder, accelerator, water reducer, dispersant, joalo-joalo.

 

1 Metsoako e tloaelehileng bakeng sa seretse se seng se kopantsoe

 

1.1 Moemeli oa ho koetlisa moea

 

Moemeli oa ho kenya moea ke moemeli ea sebetsang, 'me mefuta e tloaelehileng e kenyelletsa li-resin tsa rosin, alkyl le alkyl e nkhang hamonate ea hydrocarbon sulfonic acid, joalo-joalo Ho na le lihlopha tsa hydrophilic le lihlopha tsa hydrophobic ka molek'hule ea moemeli oa moea.Ha seretse se kenang moeeng se kenngoa seretseng, sehlopha sa hydrophilic sa molek'hule ea moea e kenang moeeng se khabisoa ka likaroloana tsa samente, ha sehlopha sa hydrophobic se kopantsoe le li-bubble tse nyenyane tsa moea.'Me e ajoa ka ho lekana ka seretse, e le ho liehisa ts'ebetso ea pele ea hydration ea samente, ho ntlafatsa ts'ebetso ea ho boloka metsi ka seretse, ho fokotsa sekhahla sa tahlehelo ea botsitso,' me ka nako e ts'oanang, li-bubble tse nyane tsa moea li ka bapala karolo ea ho tlotsa, ho ntlafatsa ho pompa le ho fafatsa ha seretse.

 

Moemeli oa ho kenya moea o kenya palo e kholo ea li-bubble tse nyenyane ka har'a seretse, e leng ho ntlafatsang ho sebetsa ha seretse, ho fokotsa ho hanyetsa nakong ea ho pompa le ho fafatsa, le ho fokotsa ts'ebetso ea ho koala;ho eketsoa ha moemeli oa ho kenya moea ho fokotsa matla a tlamahano ea seretse Ts'ebetso, ha palo ea seretse e ntse e eketseha, tahlehelo ea ts'ebetso ea matla a bond e eketseha;Moemeli oa ho kenya moea o ntlafatsa matšoao a ts'ebetso joalo ka ho tsitsa ha seretse, sekhahla sa tahlehelo ea 2h le sekhahla sa ho boloka metsi, 'me se ntlafatsa ts'ebetso ea ho fafatsa le ho pompa mochini oa seretse sa ho fafatsa, Ka lehlakoreng le leng, e baka tahlehelo ea matla a khatello ea seretse le tlamo. matla.

 

Lipatlisiso li bontša hore ntle le ho nahana ka phello ea cellulose ether, ho eketseha ha li-air-entraining agent ho ka fokotsa ka mokhoa o atlehileng boima ba metsi a seretse se seng se lokiselitsoe, moea le ho tsitsa ha seretse ho tla eketseha haholo, 'me tekanyo ea ho boloka metsi le ho feta. matla a khatello a tla fokotseha;Patlisiso mabapi le liphetoho tsa index ea ts'ebetso ea seretse se kopantsoeng le cellulose ether le moea-entraining agent e fumane hore ka mor'a ho kopanya moemeli oa moea le cellulose ether, ho ikamahanya le maemo ho lokela ho nahanoa.Cellulose ether e ka 'na ea etsa hore lisebelisoa tse ling tse kenyang moea li hlōlehe, kahoo ho etsa hore sekhahla sa ho boloka metsi a seretse se fokotsehe.

 

Motsoako o le mong oa moea o kenang moeeng, moemeli oa ho fokotsa ho fokotseha le motsoako oa bobeli o na le tšusumetso e itseng ho thepa ea seretse.Ho eketsoa ha seretse se kenang moeeng ho ka eketsa sekhahla sa shrinkage ea seretse, 'me ho eketsoa ha seretse se fokotsang shrinkage ho ka fokotsa haholo sekhahla sa shrinkage ea seretse.Ka bobeli li ka liehisa ho phatloha ha selikalikoe sa seretse.Ha tse peli li tsoakoa, sekhahla sa ho honyela ha seretse ha se fetohe haholo, 'me ho hanyetsa ha crack hoa matlafala.

 

1.2 phofo ea latex e ka qhaloang hape

 

Redispersible latex powder ke karolo ea bohlokoa ea seretse sa kajeno sa phofo se omeletseng.Ke polymer e qhibilihang ka metsing e hlahisoang ke emulsion ea polymer e phahameng ea molek'hule ka mocheso o phahameng le khatello e phahameng, ho omisa ka spray, phekolo ea holim'a metsi le mekhoa e meng.Emulsion e entsoeng ka phofo ea latex e nchafalitsoeng ka seretse sa samente e etsa sebopeho sa filimi ea polymer ka har'a seretse, se ka ntlafatsang bokhoni ba seretse sa samente ho hanela tšenyo.

 

Redispersible latex phofo e ka ntlafatsa elasticity le ho tiea ha thepa, ea ntlafatsa ts'ebetso ea phallo ea seretse se sa tsoa tsoakoa, 'me ea ba le phello e itseng ea ho fokotsa metsi.Sehlopha sa hae se ile sa lekola phello ea pheko ea sistimi ho tiisetso ea bond ea seretse.

 

Liphetho tsa lipatlisiso li bontša hore ha palo ea phofo ea rabara e fetotsoeng e le pakeng tsa 1.0% le 1.5%, thepa ea mefuta e fapaneng ea phofo ea rabara e leka-lekaneng.Ka mor'a hore phofo ea latex e khone ho kenngoa ka samente, tekanyo ea pele ea hydration ea samente e fokotseha, filimi ea polymer e koahela likaroloana tsa samente, samente e na le metsi ka ho feletseng, 'me thepa e sa tšoaneng e ntlafatsoa.Ho kopanya phofo ea morao-rao ea latex ka seretse sa samente ho ka fokotsa metsi, 'me phofo ea latex le samente li ka theha sebopeho sa marang-rang ho matlafatsa matla a seretse, ho fokotsa likheo tsa seretse, le ho ntlafatsa ts'ebetso ea seretse.

 

Phuputsong, karo-karolelano e tsitsitseng ea lime-lehlabathe e ne e le 1: 2.5, ho lumellana ho ne ho le (70 ± 5) mm, 'me palo ea phofo ea rabara e khethiloe e le 0-3% ea boima ba lehlabathe la lime.Liphetoho tsa thepa ea microscopic ea seretse se fetotsoeng matsatsing a 28 li ile tsa hlahlojoa ke SEM, 'me liphetho li bontšitse hore Theko e phahameng ea lihlahisoa tsa latex phofo e qhalakantsoeng, filimi ea polymer e tsoelang pele e thehoa holim'a sehlahisoa sa mortar hydration, le molemo tshebetso ya seretse.

 

Liphuputso li bontšitse hore ka mor'a hore e kopane le seretse sa samente, likaroloana tsa polymer le samente li tla kopana ho theha lera le nang le marang-rang, 'me mohaho o feletseng oa marang-rang o tla thehoa nakong ea ts'ebetso ea hydration, kahoo e ntlafatsa haholo matla a ho kopanya le ho haha. ea seretse se sireletsang mocheso.tshebetso.

 

1.3 Phofo e teteaneng

 

Mosebetsi oa phofo e teteaneng ke ho ntlafatsa ts'ebetso e pharaletseng ea seretse.Ke sesebelisoa sa phofo se sa keneng moeeng se lokiselitsoeng ho tsoa mefuteng e fapaneng ea lintho tse sa pheleng, li-polymers tsa organic, li-surfactants le lisebelisoa tse ling tse ikhethang.Phofo e teteaneng e kenyelletsa phofo ea morao-rao ea morao-rao, bentonite, phofo ea inorganic mineral, e bolokang metsi, joalo-joalo, e nang le phello e itseng ea adsorption ho limolek'hule tsa metsi, eseng feela e ka eketsang botsitso le ho boloka metsi a seretse, empa hape e na le tumellano e ntle le samente tse fapa-fapaneng.Ho lumellana ho ka ntlafatsa haholo ts'ebetso ea seretse.Cao Chun et al] o ile a ithuta phello ea phofo e teteaneng ea HJ-C2 ts'ebetsong ea seretse se tloaelehileng se omileng, 'me liphello li bontšitse hore phofo e teteaneng e ne e e-na le phello e fokolang ho tsitsipano le 28d matla a khatello ea seretse se tloaelehileng se omileng. e bile le phello e fokolang ho delamination ea seretse Ho na le phello e ntle ea ntlafatso.O ithutile tšusumetso ea phofo e teteaneng le likarolo tse fapaneng ho li-index tsa 'mele le tsa mochini le ho tšoarella ha seretse se secha tlas'a litekanyetso tse fapaneng.Liphetho tsa lipatlisiso li bontša hore ho sebetsa ha seretse se secha ho ntlafalitsoe haholo ka lebaka la ho eketsoa ha phofo e teteaneng.Ho kenngoa ha phofo ea latex e redispersible ho ntlafatsa matla a ho feto-fetoha ha seretse, ho fokotsa matla a khatello ea seretse, 'me ho kenngoa ha cellulose ether le lisebelisoa tsa liminerale tsa inorganic ho etsa hore matla a khatello le a feto-fetohang a seretse a fokotsehe;Likarolo li na le tšusumetso ho tšoarella ha seretse se omileng sa motsoako, se eketsang ho fokotseha ha seretse.Wang Jun et al.o ithutile tšusumetso ea bentonite le cellulose ether ho litsupa tse fapaneng tsa ts'ebetso ea seretse se kopantsoeng hantle.Tlas'a boemo ba ho netefatsa ts'ebetso e ntle ea seretse, ho ile ha etsoa qeto ea hore tekanyo e nepahetseng ea bentonite e ka bang 10kg / m3, 'me karolelano ea cellulose ether e batla e phahame.Tekanyetso e nepahetseng ke 0.05% ea kakaretso ea lisebelisoa tsa samente.Ka karo-karolelano ena, phofo e teteaneng e kopantsoeng le tse peli e na le phello e ntle mosebetsing o pharaletseng oa seretse.

 

1.4 Cellulose Ether

 

Cellulose ether e simolohile tlhalosong ea marako a lisele tsa semela ke sehoai sa Lefora Anselme Payon lilemong tsa bo-1830.E entsoe ka ho arabela selulose ho tloha lehong le k'hothone ka soda ea caustic, ebe e eketsa etherification agent bakeng sa karabelo ea lik'hemik'hale.Hobane cellulose ether e na le ho boloka metsi hantle le liphello tse teteaneng, ho eketsa ether e nyenyane ea cellulose ho samente ho ka ntlafatsa ts'ebetso ea ts'ebetso ea seretse se sa tsoa tsoakoa.Lisebelisoa tse thehiloeng ho samente, mefuta e sebelisoang hangata ea cellulose ether e kenyelletsa methyl cellulose ether (MC), hydroxyethyl cellulose ether (HEC), hydroxyethyl methyl cellulose ether (HEMC), hydroxypropyl methylcellulose Hydroxypropyl methyl cellulose ether le hydroxyethyl methyl cellulose ether. e sebedisoang hangata.

 

Hydroxypropyl methyl cellulose ether (HPMC) e na le tšusumetso e kholo ho metsi, ho boloka metsi le matla a tlamahano a seretse sa ho ikemela.Liphello li bontša hore cellulose ether e ka ntlafatsa haholo ho bolokoa ha metsi a seretse, ea fokotsa ho tsitsisa ha seretse, 'me ea bapala phello e ntle ea ho lieha;ha palo ea hydroxypropyl methylcellulose ether e pakeng tsa 0.02% le 0.04%, , matla a seretse a fokotsehile haholo.Cellulose ether e na le phello e matlafatsang moea 'me e ntlafatsa ts'ebetso ea seretse.Ho boloka metsi a eona ho fokotsa stratification ea seretse le ho lelefatsa nako ea ho sebetsa ea seretse.Ke motsoako o ka ntlafatsang ts'ebetso ea seretse ka katleho;lipatlisiso Nakong ea ts'ebetso, ho ile ha boela ha fumanoa hore litaba tsa cellulose ether ha lia lokela ho ba tse phahameng haholo.Haeba e phahame haholo, moea oa seretse o tla eketseha haholo, o fella ka ho fokotseha ha sekhahla, ho lahleheloa ke matla le tšusumetso ho boleng ba seretse.Liphuputso li bontšitse hore ho eketsoa ha cellulose ether ho ntlafatsa haholo ho boloka metsi a seretse, 'me ka nako e ts'oanang ho na le phello e kholo ea ho fokotsa metsi holim'a seretse.Cellulose ether e ka boela ea fokotsa boima ba motsoako oa seretse, ea lelefatsa nako ea ho beha, 'me ea ntlafatsa matla a flexural le a hatellang.fokotsa.Cellulose ether le starch ether ke metsoako e 'meli e sebelisoang hangata bakeng sa seretse sa kaho.

 

Leha ho le joalo, ka lebaka la mefuta e mengata e fapaneng ea li-cellulose ethers, litekanyetso tsa limolek'hule li boetse li fapane, tse hlahisang phapang e kholo mosebetsing oa seretse sa samente se fetotsoeng.Matla a seretse sa samente se fetotsoeng ka cellulose ether e nang le viscosity e phahameng a tlase.Ha litaba tsa cellulose ether li eketseha, matla a khatello ea slurry ea samente e bontša mokhoa oa ho fokotseha le ho qetella o tsitsitse, ha matla a flexural a bontša mokhoa o ntseng o eketseha, o fokotsehang, o tsitsitseng le o tsitsitseng.Ts'ebetso ea phetoho e eketseha hanyane.


Nako ea poso: Feb-02-2023
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