Mukushandiswa kwehydroxypropyl methyl cellulose HPMC, tinowanzoona kuti yakakamurwa kuita mhando mbiri: inonyungudika nekukurumidza uye inonyungudika zvishoma nezvishoma. Ngatinzwisisei musiyano uripo pakati pekunyungudika nekukurumidza uye inonyungudika zvishoma nezvishoma kwehydroxypropyl methyl cellulose.
HPMC Instant inoreva kushandiswa kwemushonga unobatanidza pamusoro pemvura mukugadzirwa kwayo, kuitira kuti HPMC ikwanise kupararira nekukurumidza mumvura inotonhora, asi kwete mhinduro chaiyo, kuburikidza nekusanganisa zvakafanana, viscosity inokwira zvishoma nezvishoma, kureva kuti, kunyungudika;
HPMC inonyunguduka zvishoma nezvishoma inogonawo kunzi zvigadzirwa zvinopisa zvakanyunguduka. Kana mvura inotonhora ikasangana nayo, inogona kuparadzirwa nekukurumidza mumvura inopisa. Nekukurunga zvakaenzana, tembiricha yemushonga inodzikira kusvika patembiricha yakati. (Tembiricha yegel yedu inenge 60°C), viscosity ichaonekwa zvishoma nezvishoma kusvika gel yaonekwa yakajeka uye inonamira.
Heino musiyano uripo pakati pemhinduro iri nyore uye mhinduro inononoka. Kana uine mibvunzo nezveruzivo urwu, unogona zvakare kutibvunza.
Hydroxypropyl methyl celluloseHPMCkunonotsa kunyoroveswa kwemvura nesimende
Kuwedzera hydroxypropyl methyl cellulose kusimende kunoderedza kunyorova kwayo. Saka chii chaunoziva nezvekuti inoshanda sei? Ngatitarisei hydroxypropyl methyl cellulose kuti inonoke kunyorova kwesimende. Pfungwa huru.
1. Fungidziro yeIon movement disorder
Takafungidzira kuti hydroxypropyl methyl cellulose yaizowedzera viscosity ye pores solutions, inokanganisa kumhanya kwe ionic movement, uye inononotsa hydration ye cement. Zvisinei, viscosity yakaderera ye cellulose ethers mu test iyi yaive nekugona kwakasimba kwekunonotsa hydration ye cement. Saka, fungidziro iyi haina basa. Pourchez et al. vanopokanawo nefungidziro iyi. Kutaura zvazviri, nguva yekufamba kwemaion kana kufamba ipfupi kwazvo, zviri pachena kuti haina kusiyana nekunonoka kwe cement hydration.
2. Kuparadzwa kwealkaline
MaPolysaccharides anoora nyore nyore pasi pemamiriro ealkaline kuti agadzire hydroxyl carboxylic acids inononotsa hydration yesimende. Nokudaro, kunonoka kwe hydroxypropyl methyl cellulose kungave kuri nekuda kwekuora kwayo mualkaline cement slurries kuti igadzire hydroxycarboxylic acids. Zvisinei, Pourchez et al. vakaona kuti cellulose ethers dzaive dzakagadzikana pasi pemamiriro ealkaline, dzakaora zvishoma chete, uye zvigadzirwa zvekuora hazvina zvazvakabatsira pakunonoka kwe hydration yesimende.
3, kunyungudika
Kunyungudika kunogona kuitwa ne hydroxypropyl methyl cellulose block cement hydration, chikonzero chaicho ndechekuti zvakawanda zvinowedzerwa zve organic zvichanyungudika pazvikamu zvesimende nezvigadzirwa zve hydration, kudzivirira kunyungudika kwezvikamu zvesimende uye crystallization yezvigadzirwa zve hydration, kuitira kuti kunonotse kunyungudika uye condensation yesimende. Pourchez nevamwe vakaona kuti cellulose ethers dzinonyungudika nyore nyore pamusoro pezvigadzirwa zve hydration zvakaita se calcium hydroxide, CSH gel uye calcium aluminate hydrate, asi hazvinyungudike nyore nyore ne ettringite uye unhydrated phases. Uyezve, kana iri cellulose ether, HEC inogona kunyungudika zvakanyanya kupfuura iyo ye MC yakazvimba. Kuderera kwehuwandu hwe hydroxyethyl mu HEC kana hydroxypropyl muHPMC, kana simba rekunyudza richikwira: nezvezvigadzirwa zvekunyudza, simba rekunyudza recalcium hydroxide rakasimba kupfuura reCSH. Ongororo yakawedzerwa inoratidzawo kuti simba rekunyudza rezvigadzirwa zvekunyudza uye cellulose ether rine chekuita nekunonoka kwekunyudza kwesimende: kana simba rekunyudza richikwira, kunonoka kuri pachena, asi kunyudza kwecellulose ether kweetringite hakuna kusimba, asi kuumbwa kwayo, asi izvi zvinononoka zvakanyanya. cellulose ether yetricalcium silicate uye zvigadzirwa zvayo zvekunyudza zvine adsorption yakasimba, zviri pachena kuti inononoka kunyudza kwechikamu chesilicate, huwandu hwekunyudza hweetringite hwakaderera kwazvo, asi kunonoka kuumbwa kweetringite kuri pachena, nekuda kwekunonoka kuumbwa kweetringite kunokanganiswa neCa2 + balance mu solution, kuwedzera kwecellulose ether. Kunyudza kwelate silicate kwakaramba kuripo.
Idzi ipfungwa dzehydroxypropyl methyl cellulose delay cement hydration. Tinovimba kuti ruzivo urwu ruchaita kuti munhu wese anzwisise mashandiro anoita chigadzirwa ichi uye achishandise zviri nani.
Nguva yekutumira: Kubvumbi-26-2024