Mukushandiswa kwehydroxypropyl methyl cellulose HPMC, tinowanzoona kuti yakakamurwa kuva marudzi maviri: kukurumidza uye kunonoka kupera. Ngatinzwisise mutsauko uripo pakati pekukurumidza kupera uye kunonoka kupera kwehydroxypropyl methyl cellulose.
Instant HPMC inoreva kushandiswa kwe-cross-linking agent yekurapa kwepamusoro mukugadzirwa kwekugadzira, kuitira kuti HPMC inogona kukurumidza kuparadzirwa mumvura inotonhora, asi kwete mhinduro chaiyo, kuburikidza neyunifomu inomutsa, viscosity inosimuka zvishoma nezvishoma, kureva, kupera;
Inononoka soluble HPMC inogona zvakare kunzi inopisa melt zvigadzirwa. Apo mvura inotonhora inosangana, inogona kukurumidza kuparadzirwa mumvura inopisa. Nekukurudzira zvakaenzana, kutonhora kwekugadzirisa kuchadonha kune imwe tembiricha. (Tembiricha yegel yedu inenge 60 ° C), iyo viscosity ichaonekwa zvishoma nezvishoma kusvikira gel rakajeka uye rinonamatira raumbwa.
Heino mutsauko pakati pekukurumidza mhinduro uye inononoka mhinduro. Kana uine chero mibvunzo pamusoro peruzivo urwu, unogonawo kutibvunza.
Hydroxypropyl methyl celluloseHPMCkunonotsa simende hydration
Kuwedzera hydroxypropyl methyl cellulose kune simenti kunonotsa hydration yayo. Saka iwe unozivei nezve mashandiro ayo? Ngatitarisei hydroxypropyl methyl cellulose kunonoka simende hydration. Principle.
1. Ion movement disorder hypothesis
Isu takafungidzira kuti hydroxypropyl methyl cellulose yaizowedzera viscosity yepore mhinduro, kutadzisa chiyero chekufamba kweionic, uye kunonoka hydration ye simende. Nekudaro, iyo yakaderera viscosity cellulose ethers muyedzo iyi yaive nekwakasimba yekunonoka simende hydration. Naizvozvo, fungidziro iyi haina maturo. Pourchez et al. zvakare kupokana iyi hypothesis. Muchokwadi, nguva yekufamba kweion kana kutama ipfupi kwazvo, sezviri pachena haina kupesana nekunonoka kwesamende hydration.
2. Alkaline degradation
Polysaccharides inodzikira nyore pasi pemamiriro ealkaline kugadzira hydroxyl carboxylic acids inononoka simende hydration. Naizvozvo, kunonoka hydration yehydroxypropyl methyl cellulose inogona kunge iri nekuda kwekuparara kwayo mune alkaline simende slurries kuumba hydroxycarboxylic acids. Zvisinei, Pourchez et al. yakawana kuti cellulose ethers yakanyatsogadzikana pasi pemamiriro e-alkaline, yakaderedzwa zvishoma chete, uye zvigadzirwa zvekuora zvakange zvisingaite pakunonoka kwesamende hydration.
3, adsorption
Adsorption inogona kunge iri hydroxypropyl methyl cellulose block simende hydration chikonzero chaicho ndechekuti akawanda ekuwedzera organic anozoshambadzirwa pane simende zvimedu uye zvigadzirwa zve hydration, kudzivirira kunyungudika kwemasimende uye crystallization yezvigadzirwa zve hydration, kuitira kuti kunonoke hydration uye condensation yesimende. Pourchez et al. akawana kuti cellulose ethers adsorbed zviri nyore pamusoro pezvigadzirwa zve hydration zvakadai se calcium hydroxide, CSH gel uye calcium aluminate hydrate, asi kwete nyore nyore adsorbed ne ettringite uye unhydrated phases. Uyezve, munyaya ye cellulose ether, iyo adsorption capacity yeHEC yakasimba kudarika iyo yekuzvimba MC. Iyo yakaderera iyo yemukati yehydroxyethyl muHEC kana hydroxypropyl mukatiHPMC, iyo yakasimba iyo adsorption capacity: kana iri hydration zvigadzirwa, adsorption simba re calcium hydroxide rakasimba kupfuura iro reCSH. Kuwedzera kuongorora kunoratidzawo kuti adsorption kukwanisa kwe hydration zvigadzirwa uye cellulose ether yakabatana nekunonoka kwe simenti hydration: iyo yakasimba adsorption, iyo inonyanya kuoneka kunonoka, asi ettringite adsorption ye cellulose ether haina simba, asi kuumbwa kwayo, asi izvi zvakanyanya kunonoka. cellulose ether ye tricalcium silicate uye zvigadzirwa zvayo zve hydration zvine adsorption yakasimba, zviri pachena kuti inononoka hydration process ye silicate phase, iyo adsorption yakawanda ye ettringite yakaderera zvikuru, asi kunonoka kuumbwa kwe ettringite kuri pachena, nokuti kunonoka kuumbwa kwe ettringite kunokonzerwa neCa 2 + kuenzanisa mukugadzirisa, iyo inowedzera ether cellulose. Late silicate hydration yakaenderera mberi.
Aya ndiwo hydroxypropyl methyl cellulose kunonoka simende hydration musimboti. Tinovimba kuti ruzivo urwu ruchaita kuti munhu wese anzwisise kuti chigadzirwa chinoshanda sei uye nekuchishandisa zviri nani.
Nguva yekutumira: Kubvumbi-26-2024