Hydroxypropylmethylcellulose

Isishwankathelo: kubhekiselwa kuyo njenge-HPMC, i-fibrous emhlophe okanye emhlophe okanye i-granular powder. Kukho iintlobo ezininzi zeselulosi kwaye zisetyenziswa ngokubanzi, kodwa ikakhulu sinxibelelana nabathengi kwishishini lezinto zokwakha umgubo owomileyo. Eyona cellulose ixhaphakileyo ibhekisa kwihypromellose.

Inkqubo yokuvelisa: Izinto eziphambili ze-HPMC: i-cotton ecocekileyo, i-methyl chloride, i-propylene oxide, ezinye izinto ezisetyenziswayo ziquka i-alkali ye-flake, i-asidi, i-toluene, i-isopropanol, njl. iyure, cinezela, ucofe i-cellulose, kwaye uguge ngokufanelekileyo kwi-35 ℃, ukuze umndilili we-polymerization ofunyenweyo. ifayibha yealkali ingaphakathi koluhlu olufunekayo. Beka iifayili ze-alkali kwi-kettle ye-etherification, yongeza i-propylene oxide kunye ne-methyl chloride ngokuphindaphindiweyo, kwaye i-etherify kwi-50-80 ° C kwiiyure ze-5, kunye noxinzelelo oluphezulu malunga ne-1.8 MPa. Emva koko yongeza inani elifanelekileyo le-hydrochloric acid kunye ne-oxalic acid kumanzi ashushu kwi-90 ° C ukuhlamba izinto zokwandisa umthamo. Dehydrate nge centrifuge. Hlamba ude ungathathi hlangothi, kwaye xa ubumanzi kwizinto eziphathekayo bungaphantsi kwama-60%, zomise ngokuhamba komoya oshushu kwi-130 ° C ukuya ngaphantsi kwe-5%. Umsebenzi: ukugcinwa kwamanzi, ukutyeba, i-thixotropic anti-sag, ukusetyenzwa kwe-air-entraining, ukubuyiswa kokusetha.

Ukugcinwa kwamanzi: Ukugcinwa kwamanzi yeyona nto ibalulekileyo ye-cellulose ether! Kwimveliso ye-putty gypsum mortar kunye nezinye izinto, ukusetyenziswa kwe-cellulose ether kubalulekile. Ukugcinwa kwamanzi aphezulu kunokusabela ngokupheleleyo uthuthu lwesamente kunye ne-calcium gypsum (okukhona ukusabela ngokupheleleyo, amandla amakhulu). Ngaphantsi kweemeko ezifanayo, ukuphakama kwe-viscosity ye-cellulose ether, ngcono ukugcinwa kwamanzi (i-gap engaphezulu kwe-100,000 viscosity iyancipha); okukhona idosi iphezulu, kokukhona ugcino lwamanzi lungcono, ngokwesiqhelo isixa esincinci se-ether yeselulosi inokuphucula kakhulu ukusebenza kodaka. Izinga lokugcinwa kwamanzi, xa umxholo ufikelela kwinqanaba elithile, umkhwa wokunyusa izinga lokugcinwa kwamanzi liba lincinci; izinga lokugcinwa kwamanzi kwi-ether ye-cellulose ngokuqhelekileyo liyehla xa ubushushu be-ambient bunyuka, kodwa ezinye ii-ether ze-cellulose eziphezulu ze-gel nazo zisebenza ngcono phantsi kweemeko eziphezulu zokushisa. Ukugcinwa kwamanzi. Ukudibanisa phakathi kweeamolekyu zamanzi kunye ne-cellulose ether ye-molecular chain zenza ukuba iimolekyuli zamanzi zingene ngaphakathi kwe-cellulose ether macromolecular chain kwaye zithole amandla aqinile okubopha, ngaloo ndlela zenza amanzi akhululekile, afaka amanzi, kunye nokuphucula ukugcinwa kwamanzi kwi-slurry ye-samente.

Ukuqina, i-thixotropic kunye ne-anti-sag: inika i-viscosity egqwesileyo kudaka olumanzi! Inokunyusa kakhulu ukunamathela phakathi kodaka olumanzi kunye nomgangatho wesiseko, kunye nokuphucula ukusebenza kwe-anti-sagging yodaka. Isiphumo esityebileyo se-cellulose ethers sikwanyusa ukumelana nokusasazeka kunye ne-homogeneity yezinto ezixubeneyo ezisanda kuxutywa, ukuthintela i-delamination yezinto, ulwahlulo kunye nokopha. Umphumo wokuqina we-cellulose ethers kwizinto ezisekelwe kwisamente zivela kwi-viscosity ye-cellulose ether solutions. Phantsi kweemeko ezifanayo, okukhona i-viscosity ye-cellulose ether iphezulu, ngcono i-viscosity yezinto eziguquliweyo zesamente, kodwa ukuba i-viscosity inkulu kakhulu, iya kuchaphazela umbane kunye nokusebenza kwezinto (ezifana ne-trowel encangathi kunye nebhetshi. iscraper). nzima). I-self-leveling mortar kunye ne-self-compacting concrete efuna i-fluidity ephezulu ifuna i-viscosity ephantsi ye-cellulose ether. Ukongezelela, umphumo wokuqina we-cellulose ether uya kwandisa imfuno yamanzi yezinto ezisekelwe kwi-samente kunye nokwandisa isivuno sodaka. I-viscosity ephezulu ye-cellulose ether isisombululo samanzi sine-thixotropy ephezulu, ekwaluphawu oluphambili lwe-cellulose ether. Izisombululo ezimanzi ze-cellulose ngokubanzi zineempawu ze-pseudoplastic, ezingekho-thixotropic ezingaphantsi kobushushu bejeli, kodwa iipropathi ezihamba ngeNewtonian kumazinga aphantsi okucheba. I-pseudoplasticity iyanda ngokunyuka kobunzima bemolekyuli okanye ukuxinana kwe-cellulose ether. Iigels zesakhiwo zenziwe xa izinga lokushisa linyuka, kwaye ukuhamba okuphezulu kwe-thixotropic kwenzeka. I-cellulose ethers enezinga eliphezulu kunye ne-viscosity ephantsi ibonisa i-thixotropy nangaphantsi kobushushu be-gel. Le propathi iluncedo olukhulu kulwakhiwo lodaka lwesakhiwo ukulungisa umgangatho kunye nesag. Kufuneka kuqatshelwe apha ukuba iphezulu i-viscosity ye-ether cellulose, ngcono ukugcinwa kwamanzi, kodwa ukuphakama kwe-viscosity, ukuphakama kwe-molecular weight ye-cellulose ether, kunye nokuncipha okuhambelanayo kwi-solubility yayo, ene-negative. impembelelo kugxininiso lodaka kunye nokusebenza.

Unobangela: I-ether ye-Cellulose inefuthe elicacileyo lokungenisa umoya kwizinto ezintsha ezisekwe kwisamente. I-ether ye-cellulose ineqela le-hydrophilic (iqela le-hydroxyl, iqela le-ether) kunye neqela le-hydrophobic (iqela le-methyl, i-glucose ring), i-surfactant, inomsebenzi we-surface, kwaye ngoko inomphumela wokungenisa umoya. Impembelelo ye-air-entraining ye-cellulose ether iya kuvelisa "ibhola", enokuphucula ukusebenza kwezinto ezixutywe ngokutsha, ezifana nokwandisa iplastiki kunye nokuguquguquka kodaka ngexesha lokusebenza, okunenzuzo kwi-paving of the mortar. ; kuya kwandisa imveliso yodaka. , ukunciphisa iindleko zokwenziwa kodaka; kodwa iya kwandisa i-porosity yezinto eziqiniweyo kwaye inciphise iimpawu zayo zomatshini ezifana namandla kunye ne-elastic modulus. Njenge-surfactant, i-cellulose ether nayo inomanzi okanye i-lubricating effect kwi-particle ye-cement, ethi kunye ne-air-entraining effect yandisa umbane wezinto ezisekelwe kwi-samente, kodwa umphumo wayo wokuqina uya kunciphisa umbane. Isiphumo sokuhamba siyindibaniselwano yeplastiki kunye nemiphumo yokuqina. Xa umxholo we-cellulose ether uphantsi kakhulu, ubonakaliswa ngokukodwa njengeplastiki okanye umphumo wokunciphisa amanzi; xa umxholo uphezulu, umphumo wokuqina we-cellulose ether ukhula ngokukhawuleza, kwaye umphumo wayo wokungenisa umoya uvame ukuhluthwa, ngoko ukusebenza kwanda. Isiphumo sokujiya okanye ukunyuka kwemfuno yamanzi.

Ukumisela ukubuyiswa: I-ether ye-Cellulose inokulibazisa inkqubo ye-hydration ye-samente. I-cellulose ethers inika udaka ngeempawu ezahlukeneyo eziluncedo, kwaye ikwanciphisa ukukhutshwa kobushushu besamente kwangoko kunye nokulibaziseka kwenkqubo ye-hydration kinetic yesamente. Oku akulunganga ukusetyenziswa kodaka kwiindawo ezibandayo. Oku kuncipha kubangelwa ukubhengezwa kweemolekyuli ze-cellulose ether kwiimveliso ze-hydration ezifana ne-CSH kunye ne-ca (OH) i-2. Ngenxa yokunyuka kwe-viscosity yesisombululo se-pore, i-ether ye-cellulose iyanciphisa ukuhamba kwe-ion kwisisombululo, ngaloo ndlela ilibazise inkqubo ye-hydration. Ukuphakama koxinzelelo lwe-cellulose ether kwi-mineral gel material, isiphumo esicacileyo sokulibaziseka kwe-hydration. I-cellulose ethers ayipheleli nje ekubekeni umva, kodwa kwakhona ibuyisela inkqubo yokuqina kwenkqubo yodaka lwesamente. Umphumo wokunciphisa i-cellulose ether ayixhomekanga kuphela ekugxininiseni kwayo kwinkqubo ye-gel mineral, kodwa nakwisakhiwo samachiza. Ukuphakama kweqondo le-methylation ye-HEMC, ingcono isiphumo sokubuyiswa kwe-cellulose ether. Isiphumo sokulibazisa sinamandla. Nangona kunjalo, i-viscosity ye-cellulose ether inempembelelo encinci kwi-hydration kinetics yesamente. Ngokunyuka komxholo we-cellulose ether, ixesha lokumisela udaka landa kakhulu. Kukho ukulungelelaniswa okuhle okungahambi kakuhle phakathi kwexesha lokuqala lokumisela lodaka kunye nomxholo we-cellulose ether, kwaye ixesha lokugqibela lokumisela linomgca wolungelelwaniso olufanelekileyo kunye nomxholo we-cellulose ether. Sinokulawula ixesha lokusebenza lodaka ngokutshintsha umxholo we-cellulose ether. Kwimveliso, idlala indima yokugcina amanzi, ukuqina, ukulibazisa amandla e-cement hydration, kunye nokuphucula ukusebenza kokwakhiwa. Umthamo olungileyo wokugcinwa kwamanzi wenza i-samente ye-gypsum ash calcium isabele ngokupheleleyo, inyusa kakhulu i-viscosity emanzi, iphucula amandla ebhondi yodaka, kwaye kwangaxeshanye inokuphucula ngokufanelekileyo amandla okuqina kunye namandla okucheba, iphucula kakhulu isiphumo sokwakha kunye nokusebenza kakuhle. Ixesha elinokulungiswa. Ukuphucula ukutshiza okanye ukumpompa kodaka, kunye namandla okwakhiwa. Kweyona nkqubo yesicelo, kuyimfuneko ukumisela uhlobo, i-viscosity, kunye nesixa seselulosi ngokweemveliso ezahlukeneyo, imikhwa yokwakha, kunye nokusingqongileyo.