Hydroxypropylmethylcellulose

Overview: inonzi HPMC, chena kana kure-chena fibrous kana granular poda. Kune akawanda marudzi e cellulose uye anoshandiswa zvakanyanya, asi isu tinonyanya kusangana nevatengi muindasitiri yakaoma yehupfu yekuvaka. Iyo inonyanya kuzivikanwa cellulose inoreva hypromellose.

Magadzirirwo ekugadzira: Iyo huru yemidziyo yeHPMC: yakanatswa donje, methyl chloride, propylene oxide, zvimwe zvigadzirwa zvinosanganisira flake alkali, asidhi, toluene, isopropanol, nezvimwewo. Bata yakanatswa donje cellulose nealkali solution pa35-40 ℃ kwehafu yehafu. awa, dzvanya, pwanya cellulose, uye zera chairo pa35 ℃, kuti avhareji dhigirii yekupolymerization yeakawanikwa. alkali fiber iri mukati mechikamu chinodiwa. Isa ma alkali fibers mu kettle ye etherification, wedzera propylene oxide uye methyl chloride pamwe chete, uye etherify pa 50-80 °C kwemaawa mashanu, nekunyanya kudzvinyirira kunosvika 1.8 MPa. Wobva wawedzera huwandu hwakakodzera hwehydrochloric acid uye oxalic acid kumvura inopisa pa90 ° C kushambidza zvinhu kuti uwedzere huwandu. Dehydrate ne centrifuge. Shamba kusvika kwausingarereki, uye kana hunyoro huri muzvinhu huri pasi pe60%, huomesa nemhepo inopisa inoyerera pa130 ° C kusvika pasi pe5%. Basa: kuchengetedza mvura, kukora, thixotropic anti-sag, air-entraining workability, kudzoreredza kuseta.

Kuchengetwa kwemvura: Kuchengeta mvura ndiyo inonyanya kukosha pfuma ye cellulose ether! Mukugadzira putty gypsum mortar uye zvimwe zvinhu, cellulose ether application yakakosha. Kuchengetedzwa kwemvura kwakakwirira kunogona kuita zvizere simende dota uye calcium gypsum (kunyanya kuita, kunowedzera simba). Pasi pemamiriro akafanana, iyo yakakwira viscosity ye cellulose ether, zviri nani kuchengetedza mvura (geji riri pamusoro pe100,000 viscosity rakamanikana); iyo yakakwira dosage, zviri nani kuchengetedza mvura, kazhinji kadiki keselulosi ether inogona kuvandudza zvakanyanya kuita kwedhaka. Mwero wekuchengetedza mvura, kana zvinyorwa zvinosvika pane imwe nhanho, maitiro ekuwedzera ekuchengetedza mvura anononoka; mwero wekuchengetedza mvura we cellulose ether kazhinji unodzikira kana ambient tembiricha yawedzera, asi mamwe ma-high-gel cellulose ethers anoitawo zvirinani pasi pemamiriro ekupisa. Kuchengetedza mvura. Kupindirana pakati pemamorekuru emvura uye cellulose ether molecular cheni inoita kuti mamorekuru emvura apinde mukati me cellulose ether macromolecular cheni uye agamuchire simba rakasimba rekusunga, nekudaro kugadzira mvura yemahara, kupinza mvura, uye kuvandudza kuchengetwa kwemvura esimende slurry.

Kukora, thixotropic uye anti-sag: inopa yakanakisa viscosity kudhaka rakanyorova! Inogona kuwedzera zvakanyanya kunamatira pakati pevhu rakanyorova uye base layer, uye kugadzirisa iyo anti-sagging kuita kwedhaka. Iko kukora mhedzisiro ye cellulose ethers inowedzerawo kupararira kuramba uye homogeneity yezvichangobva kusanganiswa zvinhu, kudzivirira zvinhu delamination, kupatsanura uye kubuda ropa. Iko kukora kwekuita kwe cellulose ethers pane simende-based zvinhu kunobva kune viscosity ye cellulose ether mhinduro. Pasi pemamiriro mamwe chetewo, kukwirisa viscosity yecellulose ether, kunowedzera kutaridzika kwechinhu chakagadziridzwa simende, asi kana viscosity yakakurisa, inokanganisa kuyerera uye kushanda kwechinhu (sekunamira trowel nebatch. scraper). zvakaoma). Kuzvigadzika dhaka uye kuzvigadzirisa kongiri izvo zvinoda kunyungudika kwemvura zvinoda kushomeka kweselulosi ether. Uye zvakare, iyo thickening mhedzisiro ye cellulose ether inowedzera kudiwa kwemvura yesimende-yakavakirwa zvinhu uye kuwedzera goho redhaka. High viscosity cellulose ether aqueous solution ine high thixotropy, inovawo hunhu hukuru hwe cellulose ether. Aqueous mhinduro dze cellulose kazhinji dzine pseudoplastic, isiri-thixotropic inoyerera zvivakwa pazasi petembiricha yavo yegel, asi Newtonian inoyerera zvivakwa pazasi shear mitengo. Pseudoplasticity inowedzera nekuwedzera kwema molecular huremu kana kuungana kwe cellulose ether. Magetsi emagetsi anoumbwa kana kutonhora kuchiwedzerwa, uye yakakwirira thixotropic kuyerera kunoitika. Cellulose ethers ine high concentrations uye low viscosity inoratidza thixotropy kunyange pasi pekushisa kwegel. Ichi chivakwa chinobatsira zvikuru pakuvaka dhaka rekuvaka kuti rigadzirise mwero wayo uye sag. Zvinofanira kucherechedzwa pano kuti kukwirisa viscosity ye cellulose ether, zviri nani kuchengetwa kwemvura, asi iyo yakakwira viscosity, inokwira yakaenzana molecular uremu hwe cellulose ether, uye kuderera kunoenderana mukunyungudika kwayo, iyo ine negative. kukanganisa pakugadzirisa kwedhaka uye kushanda.

Chikonzero: Cellulose ether ine mhepo-inopinza mhedzisiro pane nyowani simende-yakavakirwa zvinhu. Cellulose ether ine zvose hydrophilic boka (hydroxyl boka, ether boka) uye hydrophobic boka (methyl boka, glucose ring), inoputika, ine basa repamusoro, uye naizvozvo ine mhepo-inopinza mhepo. Mhepo-entraining mhedzisiro ye cellulose ether inoburitsa "bhora" mhedzisiro, iyo inogona kuvandudza kushanda kweiyo ichangobva kusanganiswa zvinhu, sekuwedzera mapurasitiki uye kutsetseka kwedhaka panguva yekushanda, iyo inobatsira pakugadzira dhaka. ; zvichawedzerawo kubuda kwedhaka. , kuderedza mari yekugadzira dhaka; asi ichawedzera porosity yezvinhu zvakaomeswa uye kuderedza ma mechanical ayo akadai sesimba uye elastic modulus. Sezvinoita surfactant, cellulose ether inewo yekunyorova kana mafuta ekuzora pazvimedu zvesimende, izvo pamwe chete nemhepo-inopinza mhedzisiro inowedzera fluidity yesimende-yakavakirwa zvinhu, asi kukora kwayo kunoderedza fluidity. Mhedzisiro yekuyerera isanganiswa yeplasticizing uye thickening mhedzisiro. Kana zvinyorwa zve cellulose ether zvakanyanya kuderera, zvinonyanya kuratidzwa sepurasitiki kana kuderedza mvura; kana zviri mukati zvakakwirira, iyo thickening mhedzisiro ye cellulose ether inowedzera nekukurumidza, uye iyo mhepo-entraining mhedzisiro inoita kunge yakazara, saka kuita kunowedzera. Kukora mhedzisiro kana kuwedzera kudiwa kwemvura.

Kuisa kunonoka: Cellulose ether inogona kunonoka hydration process ye simenti. Cellulose ethers inopa dhaka nezvinhu zvakasiyana-siyana zvinobatsira, uye zvakare kuderedza yekutanga hydration kupisa kusunungurwa kwe simenti uye kunonoka hydration kinetic process ye simenti. Izvi hazvina kunaka pakushandiswa kwedhaka munzvimbo dzinotonhora. Uku kunonoka kunokonzerwa nekushambadza kwe cellulose ether mamorekuru pane hydration zvigadzirwa seCSH uye ca(OH)2. Nekuda kwekuwedzera kweiyo viscosity yemushonga wepore, iyo cellulose ether inoderedza kufamba kweiyoni mumhinduro, nekudaro kunonotsa iyo hydration process. Iyo yakanyanya kukwirisa iyo cellulose ether mumineral gel zvinhu, zvakanyanya kutaurwa mhedzisiro yekunonoka kwe hydration. Cellulose ethers haingoregi kumisa, asi zvakare kudzoreredza kuomarara kwesimende mortar system. Iko kunonoka kweiyo cellulose ether kunoenderana kwete chete nekuisa kwayo mumineral gel system, asiwo pane chimiro chemakemikari. Iyo yakakwirira dhigirii yemethylation yeHEMC, zviri nani kudzoreredza mhedzisiro ye cellulose ether. The retardation effect yakasimba. Nekudaro, iyo viscosity ye cellulose ether haina mhedzisiro pa hydration kinetics ye simenti. Nekuwedzera kwe cellulose ether content, nguva yekuisa dhaka inowedzera zvakanyanya. Pane kuwirirana kwakanaka kusingaenzaniswi pakati pekutanga kugadzika nguva yedhaka uye zviri mukati me cellulose ether, uye nguva yekupedzisira yekumisikidza ine yakanaka mutsara kuwirirana nemukati we cellulose ether. Tinogona kudzora nguva yekushanda yedhaka nekushandura zvinyorwa zve cellulose ether. Muchigadzirwa, inobata basa rekuchengetedza mvura, kukora, kunonoka simende hydration simba, uye kuvandudza mashandiro ekuvaka. Yakanaka kuchengetedza mvura inoita kuti simende gypsum ash calcium iite zvakanyanya, inowedzera zvakanyanya kunyorova viscosity, inovandudza chisungo chesimba redhaka, uye panguva imwechete inogona kunyatso kuvandudza simba rekusimba uye kugera simba, kuvandudza zvakanyanya mhedzisiro yekuvaka uye kushanda zvakanaka. Nguva inogadziriswa. Inovandudza kupfapfaidza kana kupomba kwedhaka, pamwe nekusimba kwechimiro. Muchiitiko chaicho chekushandisa, zvinodikanwa kuti uone rudzi, viscosity, uye huwandu hweselulosi zvinoenderana neyakasiyana zvigadzirwa, maitiro ekuvaka, uye nharaunda.