Iselulosi etheryimbumba yepolymer enesakhiwo se-ether esenziwe ngeselulosi. Iringi nganye ye-glucosyl kwi-cellulose macromolecule iqulethe amaqela amathathu e-hydroxyl, iqela eliphambili le-hydroxyl kwi-athom ye-carbon yesithandathu, iqela le-hydroxyl yesibini kwi-athom ye-carbon yesibini neyesithathu, kunye ne-hydrogen kwiqela le-hydroxyl lithatyathelwa indawo liqela le-hydrocarbon ukuvelisa izinto eziphuma kwi-cellulose ether. Yimveliso apho i-hydrogen yeqela le-hydroxyl kwi-polymer cellulose ithathelwe indawo liqela le-hydrocarbon. I-Cellulose yi-polyhydroxy polymer ikhompawundi enganyibilikiyo okanye inyibilike. Emva kwe-etherification, i-cellulose iyanyibilika emanzini, i-dilute isisombululo se-alkali kunye ne-organic solvent, kwaye ine-thermoplasticity.
I-Cellulose yi-polyhydroxy polymer ikhompawundi enganyibilikiyo okanye inyibilike. Emva kwe-etherification, i-cellulose iyanyibilika emanzini, i-dilute isisombululo se-alkali kunye ne-organic solvent, kwaye ine-thermoplasticity.
1.Indalo:
I-solubility ye-cellulose emva kwe-etherification itshintsha kakhulu. Inokunyibilika emanzini, i-asidi ye-dilute, i-alkali edibeneyo okanye i-solvent ye-organic. Ukunyibilika ikakhulu kuxhomekeke kwizinto ezintathu: (1) Iimpawu zamaqela aqaliswe kwinkqubo ye-etherification, yaziswa Iqela elikhulu, i-solubility ephantsi, kwaye inamandla i-polarity yeqela elaziswayo, i-ether ye-cellulose kulula ukunyibilika emanzini; (2) Iqondo lokutshintshwa kunye nokusasazwa kwamaqela etherified kwi-macromolecule. Uninzi lwe-cellulose ethers lunokunyibilika kuphela emanzini phantsi kweqondo elithile lokutshintshwa, kwaye iqondo lokutshintshwa liphakathi kwe-0 kunye ne-3; (3) Iqondo lepolymerization ye-cellulose ether, iqondo eliphezulu le-polymerization, i-soluble encinci; Iqondo eliphantsi lokutshintshwa elinokuthi linyibilike emanzini, uluhlu olubanzi. Kukho iintlobo ezininzi ze-cellulose ethers ezinomsebenzi obalaseleyo, kwaye zisetyenziswa ngokubanzi kulwakhiwo, isamente, i-petroleum, ukutya, i-textile, i-detergent, ipeyinti, amayeza, ukwenza iphepha kunye nezixhobo ze-elektroniki kunye namanye amashishini.
2. Phuhlisa:
I-China lelona lizwe livelisa i-cellulose ether enkulu kwihlabathi, kunye nesantya sokukhula sonyaka esingaphezulu kwama-20%. Ngokwezibalo zokuqala, kukho malunga nama-50 amashishini okuvelisa i-cellulose ether e-China, umthamo owenziweyo wemveliso ye-cellulose ether industry idlule iitoni ezingama-400,000, kwaye kukho amashishini angama-20 aneetoni ezingaphezu kwe-10,000, ezisasazwa ikakhulu eShandong, eHebei, eChongqing naseJiangsu. , Zhejiang, Shanghai kunye nezinye iindawo.
3. Kufuneka:
Ngo-2011, amandla emveliso yeCMC yaseTshayina ayemalunga neetoni ezingama-300,000. Ngokukhula kwemfuno ekumgangatho ophezulu we-cellulose ethers kumashishini afana namayeza, ukutya, kunye neekhemikhali zemihla ngemihla, imfuno yasekhaya yezinye iimveliso ze-cellulose ether ngaphandle kwe-CMC iyanda. , amandla okuvelisa i-MC / HPMC malunga neetoni ze-120,000, kwaye i-HEC imalunga neetoni ezingama-20,000. I-PAC isekwinqanaba lokukhuthazwa kunye nesicelo e-China. Ngophuhliso lwamasimi amakhulu e-oyile engaselunxwemeni kunye nophuhliso lwezixhobo zokwakha, ukutya, imichiza kunye namanye amashishini, isixa kunye nentsimi yePAC iyanda kwaye yanda unyaka nonyaka, kunye nomthamo wemveliso yeetoni ezingaphezu kwe-10,000.
4. Ukuhlelwa:
Ngokutsho kokuhlelwa kweekhemikhali ze-substituents, zinokwahlulwa zibe yi-anionic, i-cationic kunye ne-nonionic ethers. Ngokuxhomekeke kwi-etherification agent esetyenzisiweyo, kukho i-methyl cellulose, i-hydroxyethyl methyl cellulose, i-carboxymethyl cellulose, i-ethyl cellulose, i-benzyl cellulose, i-hydroxyethyl cellulose, i-hydroxypropyl methyl cellulose cellulose, i-cyanoethyl cellulose, i-benzyl cyanoethyl carulose cellulose i-cellulose, njl. I-Methyl cellulose kunye ne-ethyl cellulose zisebenza ngakumbi.
Methylcellulose:
Emva kokuba umqhaphu osulungekisiweyo uphathwe ngealkali, i-cellulose ether iveliswa ngothotho lweempendulo ngemethane chloride njenge-etherification agent. Ngokubanzi, iqondo lokutshintsha liyi-1.6 ~ 2.0, kwaye ukunyibilika kwahluka ngokwamanqanaba okutshintsha. yeye-non-ionic cellulose ether.
(1) I-Methylcellulose iyanyibilika emanzini abandayo, kwaye kuya kuba nzima ukuyinyibilika emanzini ashushu. Isisombululo saso samanzi sizinzile kakhulu kuluhlu lwe-pH = 3 ~ 12. Inokuhambelana kakuhle nestatshi, i-guar gum, njl. kunye nee-surfactants ezininzi. Xa iqondo lokushisa lifikelela kwiqondo lokushisa, i-gelation iyenzeka.
(2) Ukugcinwa kwamanzi kwe-methyl cellulose kuxhomekeke kwisixa sayo sokongeza, i-viscosity, ubungakanani bamasuntswana kunye nesantya sokuchithwa. Ngokuqhelekileyo, ukuba isixa esongezelelweyo sikhulu, i-fineness incinci, kwaye i-viscosity inkulu, izinga lokugcinwa kwamanzi liphezulu. Phakathi kwabo, inani lokongezelela linempembelelo enkulu kwizinga lokugcinwa kwamanzi, kwaye inqanaba le-viscosity alilingani ngokuthe ngqo kwinqanaba lokugcinwa kwamanzi. Izinga lokuchithwa ikakhulu lixhomekeke kwiqondo lokuguqulwa komphezulu wamasuntswana e-cellulose kunye ne-particle fineness. Phakathi kwezi ether ze-cellulose ezingentla, i-methyl cellulose kunye ne-hydroxypropyl methyl cellulose zinezinga eliphezulu lokugcina amanzi.
(3) Ukutshintsha kobushushu kunokuchaphazela ngokunzulu ukugcinwa kwamanzi kwi-methyl cellulose. Ngokuqhelekileyo, okukhona ubushushu buphezulu, kokukhona ukugcinwa kwamanzi kubi. Ukuba ubushushu bomdaka budlula i-40 ° C, ukugcinwa kwamanzi kwe-methyl cellulose kuya kuncitshiswa kakhulu, kuchaphazela kakhulu ukwakhiwa kodaka.
(4)I-Methyl celluloseinefuthe elibonakalayo ekusebenzeni kunye nokuhambelana kodaka. “Ukuncamatheliswa” apha kubhekiselele kumandla okudibanisa okuvakala phakathi kwesixhobo sofakelo somsebenzi kunye nenxalenye yodonga, oko kukuthi, ukuxhathisa kokucheba kodaka. I-adhesiveness iphezulu, ukuxhathisa i-shear yodaka kukhulu, kwaye amandla afunwa ngabasebenzi kwinkqubo yokusetyenziswa nawo mkhulu, kwaye ukusebenza kokwakhiwa kodaka kubi. Ukubambisana kwe-methyl cellulose kwinqanaba eliphakathi kwiimveliso ze-cellulose ether.
Hydroxypropylmethylcellulose:
IHydroxypropyl methylcellulose luhlobo lweselulosi oluphuma kunye nokusetyenziswa kwayo kunyuka ngokukhawuleza. I-ether engeyiyo ionic cellulose exutywe ne-ether eyenziwe kwi-cotton ecocekileyo emva kwe-alkalization, isebenzisa i-propylene oxide kunye ne-methyl chloride njenge-etherification agent, ngokusebenzisa uluhlu lweempendulo. Iqondo lokutshintshwa ngokubanzi yi-1.2 ~ 2.0. Iimpawu zayo ziyahluka ngokuxhomekeka kumlinganiselo we-methoxyl umxholo we-hydroxypropyl.
(1) IHydroxypropyl methylcellulose inyibilika ngokulula emanzini abandayo, kwaye iya kudibana nobunzima ekunyibilikeni kumanzi ashushu. Kodwa ubushushu bayo be-gelation emanzini ashushu buphezulu kakhulu kune-methyl cellulose. Ukunyibilika kumanzi abandayo kuphuculwe kakhulu xa kuthelekiswa ne-methyl cellulose.
(2) I-viscosity ye-hydroxypropyl methylcellulose ihambelana nobunzima bayo be-molecular, kwaye ubukhulu be-molecular weight, buphezulu be-viscosity. Ubushushu buchaphazela i-viscosity yayo, njengoko izinga lokushisa linyuka, i-viscosity iyancipha. Nangona kunjalo, impembelelo ye-viscosity yayo ephezulu kunye nobushushu buphantsi kune-methyl cellulose. Isisombululo sayo sizinzile xa sigcinwe kwiqondo lokushisa.
(3) Ukugcinwa kwamanzi kwe-hydroxypropyl methylcellulose kuxhomekeke kwisixa sokongeza, i-viscosity, njl.
(4)IHydroxypropyl methylcelluloseizinzile kwi-asidi kunye ne-alkali, kwaye isisombululo sayo samanzi sizinzile kakhulu kuluhlu lwe-pH = 2 ~ 12. I-Caustic soda kunye namanzi ekalika anempembelelo encinci ekusebenzeni kwayo, kodwa i-alkali inokukhawulezisa ukuchithwa kwayo kwaye yandise i-viscosity yayo. I-Hydroxypropyl methylcellulose izinzile kwiityuwa eziqhelekileyo, kodwa xa ukuxinwa kwesisombululo setyuwa kuphezulu, i-viscosity ye-hydroxypropyl methylcellulose isisombululo ivame ukunyuka.
(5) I-Hydroxypropyl methylcellulose inokuxutywa kunye ne-polymer compounds e-soluble yamanzi ukuze yenze isisombululo esifanayo kunye ne-viscosity ephezulu. Okufana ne-polyvinyl alcohol, i-starch ether, i-gum yemifuno, njl.
(6) I-Hydroxypropyl methylcellulose inokumelana ne-enzyme engcono kune-methylcellulose, kwaye isisombululo sayo asikwazi ukuthotywa yi-enzymes kune-methylcellulose.
(7) I-adhesion ye-hydroxypropyl methylcellulose kwisakhiwo sodaka iphezulu kune-methylcellulose.
Iselulosi yeHydroxyethyl:
Yenziwe kwikotoni ecocekileyo ephathwa nge-alkali, kwaye iphendule nge-ethylene oxide njenge-etherification agent phambi kwe-isopropanol. Iqondo layo lokutshintshwa ngokubanzi yi-1.5 ~ 2.0. Ine-hydrophilicity eyomeleleyo kwaye kulula ukufunxa ukufuma.
(1) I-Hydroxyethyl cellulose iyanyibilika emanzini abandayo, kodwa kunzima ukuyinyibilika emanzini ashushu. Isisombululo saso sizinzile kwiqondo lokushisa eliphezulu ngaphandle kwe-gelling. Ingasetyenziselwa ixesha elide phantsi kobushushu obuphezulu kwidaka, kodwa ukugcinwa kwamanzi kwayo kuphantsi kune-methyl cellulose.
(2) I-Hydroxyethyl cellulose izinzile kwi-asidi jikelele kunye ne-alkali, kwaye i-alkali inokukhawulezisa ukuchithwa kwayo kwaye yandise i-viscosity yayo. I-dispersibility yayo emanzini imbi kancinane kune-methyl cellulose kunye ne-hydroxypropyl methyl cellulose.
(3) I-Hydroxyethyl cellulose inokusebenza kakuhle kwe-anti-sag yodaka, kodwa inexesha elide lokubuyiswa kwesamente.
(4) Ukusebenza kwe-hydroxyethyl cellulose eveliswa ngamanye amashishini asekhaya ngokucacileyo isezantsi kune-methyl cellulose ngenxa yobuninzi bamanzi kunye nomxholo ophezulu wothuthu.
(5) Ukungunda kwesisombululo esimanzi se-hydroxyethyl cellulose sinobuzaza. Kwiqondo lokushisa malunga ne-40 ° C, i-mildew ingenzeka phakathi kweentsuku ezi-3 ukuya kwezi-5, eziya kuchaphazela ukusebenza kwayo.
Carboxymethyl cellulose:
I-Lonic cellulose ether yenziwe kwimicu yendalo (ikotoni, njl.njl.) emva konyango lwe-alkali, kusetyenziswa i-sodium monochloroacetate njenge-etherification agent, kwaye iphantsi koluhlu lwezonyango zokusabela. Iqondo lokutshintshwa ngokubanzi yi-0.4 ~ 1.4, kwaye ukusebenza kwayo kuchatshazelwa kakhulu ngumgangatho wokutshintshwa.
(1) I-Carboxymethyl cellulose i-hygroscopic ngakumbi, kwaye iya kuba namanzi amaninzi xa igcinwe phantsi kweemeko eziqhelekileyo.
(2) I-Carboxymethyl cellulose isisombululo samanzi asivelisi i-gel, kwaye i-viscosity iyancipha ngokunyuka kweqondo lokushisa. Xa iqondo lokushisa lidlula i-50 ° C, i-viscosity ayinakuguqulwa.
(3) Ukuzinza kwayo kuchaphazeleka kakhulu yi-pH. Ngokuqhelekileyo, inokusetyenziswa kwi-gypsum-based mortar, kodwa kungekhona kwi-samente-based mortar. Xa i-alkaline iphezulu, iya kulahlekelwa yi-viscosity.
(4) Ukugcinwa kwawo kwamanzi kuphantsi kakhulu kune-methyl cellulose. Unempembelelo ephazamisayo kwi-gypsum-based mortar kwaye inciphisa amandla ayo. Nangona kunjalo, ixabiso le-carboxymethyl cellulose liphantsi kakhulu kunelo le-methyl cellulose.
Iselulosi Alkyl Ether:
Abameleyo yi-methyl cellulose kunye ne-ethyl cellulose. Kwimveliso yemizi-mveliso, i-methyl chloride okanye i-ethyl chloride isetyenziswa ngokubanzi njengearhente ye-etherification, kwaye impendulo imi ngolu hlobo lulandelayo:
Kwifomula, i-R imele i-CH3 okanye i-C2H5. Ugxininiso lwe-alkali aluchaphazeli kuphela iqondo le-etherification, kodwa lichaphazela ukusetyenziswa kwe-alkyl halides. Ukuncipha koxinzelelo lwealkali, kokukhona kunamandla ihydrolysis yealkyl halide. Ukuze kuncitshiswe ukusetyenziswa kwe-etherifying agent, i-alkali concentration kufuneka inyuswe. Nangona kunjalo, xa ugxininiso lwe-alkali luphezulu kakhulu, umphumo wokudumba kweselulosi uyancitshiswa, nto leyo engabangeli ukusabela kwe-etherification, kwaye iqondo le-etherification liyancitshiswa. Ngenxa yale njongo, i-lye egxininisiweyo okanye i-lye eqinile inokongezwa ngexesha lokuphendula. I-reactor kufuneka ibe nesixhobo esilungileyo sokushukumisa nokukrazula ukuze ialkali isasazwe ngokulinganayo. I-Methyl cellulose isetyenziswa ngokubanzi njenge-thickener, i-adhesive kunye ne-colloid yokukhusela njl. amandla okuqala, njl. Iimveliso ze-cellulose ze-Ethyl zinamandla amakhulu omatshini, ukuguquguquka, ukuxhathisa ukushisa kunye nokumelana nokubanda. I-cellulose ye-ethyl ephantsi endaweni ephantsi iyanyibilika emanzini kwaye idibanise izisombululo ze-alkaline, kunye neemveliso ezifakwe endaweni ephezulu zinyibilika kwiintlobo ezininzi ze-organic solvents. Inokuhambelana kakuhle kunye neerasi ezahlukeneyo kunye neeplastiki. Ingasetyenziselwa ukwenza iiplastiki, iifilimu, ivanishi, i-adhesives, i-latex kunye nezixhobo zokugquma iziyobisi, njl. Ukuqaliswa kwamaqela e-hydroxyalkyl kwi-cellulose alkyl ethers kunokuphucula ukunyibilika kwayo, ukunciphisa uvakalelo lwayo kwi-salting ngaphandle, ukwandisa ubushushu be-gelation kunye nokuphucula iipropati ezishushu zokunyibilika, njl njl. amaqela e-hydroxyalkyl.
I-Cellulose Hydroxyalkyl Ether:
Abo bamele i-hydroxyethyl cellulose kunye ne-hydroxypropyl cellulose. Ii-etherifying agents zi-epoxides ezifana ne-ethylene oxide kunye ne-propylene oxide. Sebenzisa i-asidi okanye isiseko njenge-catalyst. Imveliso yemizi-mveliso kukusabela i-alkali cellulose kunye ne-etherification agent:i-hydroxyethyl cellulosengexabiso eliphezulu endaweni iyanyibilika kumanzi abandayo kunye namanzi ashushu. Iselulosi yeHydroxypropyl enexabiso eliphezulu lokutshintsha inyibilika kuphela kumanzi abandayo kodwa hayi emanzini ashushu. Iselulosi yeHydroxyethyl inokusetyenziswa njengento ejiyileyo yokugquma i-latex, ukuprintwa kwelaphu kunye neepasti zokudaya, izinto zokulinganisa iphepha, izinto zokuncamathelisa kunye nee-colloids ezikhuselayo. Ukusetyenziswa kwe-cellulose ye-hydroxypropyl kufana ne-hydroxyethyl cellulose. I-Hydroxypropyl cellulose enexabiso eliphantsi lokutshintshwa ingasetyenziswa njenge-excipient yamayeza, enokuthi ibe neempawu zokubopha kunye nokuqhawula.
I-Carboxymethyl cellulose, isifinyezo sesiNgesi i-CMC, sihlala sikhona ngohlobo lwetyuwa yesodium. I-etherifying agent yi-monochloroacetic acid, kwaye impendulo ihamba ngolu hlobo lulandelayo:
I-Carboxymethyl cellulose yeyona nto isetyenziswa kakhulu i-cellulose ether enyibilikayo emanzini. Ngaphambili, yayisetyenziswa ikakhulu njengodaka lokwemba, kodwa ngoku iye yandiswa ukuba isetyenziswe njenge-additive of detergent, i-slurry yempahla, ipeyinti ye-latex, i-coating yekhadibhodi kunye nephepha, njl.
I-Polyanionic cellulose (PAC) yi-ionic cellulose ether kwaye iyimveliso ethatha indawo ephezulu ye-carboxymethyl cellulose (CMC). Ingumgubo omhlophe, omhlophe, omhlophe okanye otyheli kancinane okanye igranule, ayinayo ityhefu, ayinancasa, kulula ukuyinyibilika emanzini ukwenza isisombululo esiselubala kunye ne-viscosity ethile, inozinzo olungcono lokumelana nobushushu kunye nokumelana netyuwa, kunye neempawu ezinamandla zokulwa ne-antibacterial. Akukho kungunda kunye nokonakala. Ineempawu zokucoceka okuphezulu, iqondo eliphezulu lokutshintshwa, kunye nokuhanjiswa okufanayo kwezinto ezibambeleyo. Ingasetyenziswa njenge-binder, i-thickener, i-rheology modifier, i-reducer yokulahlekelwa kwamanzi, i-suspension stabilizer, njl. I-Polyanionic cellulose (PAC) isetyenziswa ngokubanzi kuwo onke amashishini apho i-CMC ingasetyenziswa khona, enokunciphisa kakhulu umthamo, iququzelele ukusetyenziswa, inike uzinzo olungcono kwaye ihlangabezane neemfuno eziphezulu zenkqubo.
I-Cyanoethyl cellulose yimveliso yokusabela ye-cellulose kunye ne-acrylonitrile phantsi kwe-catalysis ye-alkali.
I-cellulose ye-cyanoethyl ine-dielectric ephezulu rhoqo kunye ne-coefficient yelahleko ephantsi kwaye ingasetyenziselwa njenge-matrix ye-resin ye-phosphor kunye nezibane ze-electroluminescent. I-cyanoethyl cellulose efakwe endaweni ephantsi ingasetyenziswa njengephepha lokukhusela i-transformers.
I-ethers yotywala obunamafutha aphezulu, i-alkenyl ethers, kunye ne-ethers yotywala enevumba elimnandi ye-cellulose iye yalungiswa, kodwa ayizange isetyenziswe ekusebenzeni.
Iindlela zokulungiselela i-cellulose ether zinokwahlulwa zibe yindlela ephakathi kwamanzi, indlela ye-solvent, indlela yokuxova, indlela ye-slurry, i-gas-solid method, indlela yesigaba solwelo kunye nokudibanisa iindlela ezingentla.
5.Umgaqo wokulungiselela:
I-pulp ephezulu ye-α-cellulose ifakwe kunye nesisombululo se-alkaline ukuyidumba ukutshabalalisa iibhondi ze-hydrogen ezininzi, iququzelele ukusasazwa kwee-reagents kunye nokuvelisa i-alkali cellulose, kwaye emva koko isabela nge-etherification agent ukufumana i-ether cellulose. Ii-etherifying agents ziquka i-hydrocarbon halides (okanye i-sulfates), i-epoxides, kunye ne-α kunye ne-β i-unsaturated compounds kunye nabamkeli be-electron.
6.Umsebenzi osisiseko:
I-Admixtures idlala indima ephambili ekuphuculeni ukusebenza kwesakhiwo sodaka oluxubileyo, kunye ne-akhawunti engaphezulu kwe-40% yeendleko zempahla kwi-dry-mixed mortar. Inxalenye enkulu yomxube kwimarike yasekhaya inikezelwa ngabavelisi bangaphandle, kwaye idosi yereferensi yemveliso ikwabonelelwa ngumthengisi. Ngenxa yoko, ixabiso leemveliso zodaka oluxutyiweyo luhlala luphezulu, kwaye kunzima ukuvakalisa i-masonry eqhelekileyo kunye ne-plastering mortars kunye nenani elikhulu kunye noluhlu olubanzi. Iimveliso zentengiso ezikumgangatho ophezulu zilawulwa ziinkampani zangaphandle, kwaye abavelisi bodaka oluxubeneyo olomileyo banengeniso ephantsi kunye nokufikeleleka kwexabiso eliphantsi; ukusetyenziswa kwe-admixtures kuswele uphando olucwangcisiweyo kunye nolujoliswe kuyo, kwaye lulandela ngokungaboniyo iifomyula zangaphandle.
I-ejenti yokugcina amanzi ngumxube obalulekileyo wokuphucula ukugcinwa kwamanzi omdaka odibeneyo owomileyo, kwaye ikwayenye yezinto ezidityanisiweyo eziphambili zokumisela ixabiso lezinto ezixutywe ngodaka. Umsebenzi oyintloko we-cellulose ether kukugcina amanzi.
I-ether ye-cellulose ligama eliqhelekileyo loluhlu lweemveliso eziveliswa yi-reaction ye-alkali cellulose kunye ne-etherifying agent phantsi kweemeko ezithile. I-alkali cellulose ithathelwa indawo ngama-agent ahlukeneyo e-etherifying ukufumana ii-ethers ze-cellulose ezahlukeneyo. Ngokweempawu ze-ionization yezinto ezithatha indawo, i-cellulose ethers inokwahlulwa ibe ngamacandelo amabini: ionic (efana ne-carboxymethyl cellulose) kunye ne-nonionic (efana ne-methyl cellulose). Ngokohlobo lwe-substituent, i-cellulose ether inokohlulwa ibe yi-monoether (efana ne-methyl cellulose) kunye ne-ether exutywe (njenge-hydroxypropyl methyl cellulose). Ngokwe-solubility eyahlukeneyo, inokwahlulwa ibe yi-solubility yamanzi (efana ne-hydroxyethyl cellulose) kunye ne-organic solvent solubility (efana ne-ethyl cellulose). Udaka oluxubeneyo elomileyo luyi-cellulose enyibilikayo emanzini, kwaye i-cellulose enyibilikayo emanzini yahlulwe ibe luhlobo olukhawulezileyo kunye nohlobo lokupheliswa kokulibaziseka okunyangwayo.
Indlela yokusebenza ye-cellulose ether kumdaka ihamba ngolu hlobo lulandelayo:
(1) Emva kwei-cellulose etherUdaka lunyibilika emanzini, ukuhanjiswa okusebenzayo kunye okufanayo kwezinto ze-cementitious kwinkqubo kuqinisekiswa ngenxa yomsebenzi ongaphezulu, kunye ne-ether cellulose, njenge-colloid ekhuselayo, "isonga" amasuntswana aqinileyo kunye noqweqwe lwefilimu yokuthambisa yenziwe kumphezulu walo wangaphandle, okwenza inkqubo yodaka izinze ngakumbi, kwaye iphucula inkqubo yodaka kunye nenkqubo yodaka olugudileyo.
(2) Ngenxa yolwakhiwo lwalo lwemolekyuli, isisombululo se-cellulose ether senza ukuba ukufuma kumdaka kungabi lula ukulahleka, kwaye ngokuthe ngcembe kuyayikhulula ngexesha elide, inika udaka ngokugcinwa kakuhle kwamanzi kunye nokusebenza.
Ixesha lokuposa: Apr-28-2024