Isticmaalkacellulose hydroxypropyl methyl HPMC, badanaa waxaan ogaanaa in asal ahaan loo qaybiyay laba nooc: kala diris degdeg ah iyo mid gaabis ah. Aan fahamno farqiga u dhexeeya kala diris degdeg ah iyo kala diris gaabis ah oo ah hydroxypropyl methyl cellulose.
HPMC degdeg ah waxay tilmaamaysaa isticmaalka wakiilka isku xidhka ah ee daaweynta dusha sare ee habka wax soo saarka, si HPMC si dhakhso ah loogu kala firdhiyo biyo qabow, laakiin aan ahayn xal dhab ah, iyada oo loo marayo walaaqid isku mid ah, dheellitirka ayaa si tartiib tartiib ah u kordha, taas oo ah, kala dirida;
HPMC-ga oo si tartiib ah u milma waxaa sidoo kale loogu yeeri karaa alaabada dhalaalisa kulul. Marka biyo qabow la kulmo, si dhakhso ah ayaa loogu kala firdhin karaa biyo kulul. Marka si siman loo walaaqo, heerkulka xalka wuxuu hoos ugu dhici doonaa heerkul gaar ah. (Heerkulka jelkeenu waa qiyaastii 60°C), dheellitirku si tartiib ah ayuu u muuqan doonaa ilaa uu samaysmo jel hufan oo dhegdheg leh.
Waa kan kala duwanaanshaha u dhexeeya xalka degdegga ah iyo xalka gaabiska ah. Haddii aad wax su'aalo ah ka qabtid aqoontan, waad nala soo xiriiri kartaa.
Cellulose Hydroxypropyl methylHPMCwaxay dib u dhigtaa fuuq-baxa sibidhka
Ku darista hydroxypropyl methyl cellulose sibidhka waxay hoos u dhigtaa fuuq-baxa. Haddaba maxaad ka taqaanaa sida uu u shaqeeyo? Aan eegno hydroxypropyl methyl cellulose si loo daahiyo fuuq-baxa sibidhka. Mabda'a.
1. Mala-awaalka khalkhalka dhaqdhaqaaqa Ion
Waxaan qiyaasnay in hydroxypropyl methyl cellulose ay kordhin doonto viscosity-ga xalalka daloolada, ay carqaladeyn doonto heerka dhaqdhaqaaqa ionic, iyo inay dib u dhigto fuuq-celinta sibidhka. Si kastaba ha ahaatee, ethers-ka cellulose ee viscosity-ga hooseeya ee tijaabadan waxay lahaayeen awood xooggan oo ay dib ugu dhigaan fuuq-celinta sibidhka. Sidaa darteed, mala-awaalkani waa mid aan sax ahayn. Pourchez et al. sidoo kale waxay shaki ka qabaan mala-awaalkan. Xaqiiqdii, waqtiga socdaalka ion-ka ama socdaalka waa mid aad u gaaban, sida muuqata ma aha mid ka duwan dib u dhaca fuuq-celinta sibidhka.
2. Qalalaasaha alkaline
Polysaccharides si fudud ayay u burburaan marka ay ku jiraan xaaladaha alkaline si ay u soo saaraan asiidhyada hydroxyl carboxylic kuwaas oo dib u dhiga fuuq-celinta sibidhka. Sidaa darteed, fuuq-celinta dib-u-dhaca ee hydroxypropyl methyl cellulose waxay sabab u noqon kartaa burburka ku yimaada slurries sibidhka alkaline si ay u sameeyaan asiidhyada hydroxycarboxylic. Si kastaba ha ahaatee, Pourchez et al. waxay ogaadeen in ethers-ka cellulose ay aad u deggan yihiin xaaladaha alkaline, ay wax yar uun burbureen, alaabada burburkana saameyn yar ayay ku yeesheen dib u dhaca fuuq-celinta sibidhka.
3, nuugista
Adkeysiga waxaa noqon kara hydroxypropyl methyl cellulose block cement fuuq-celinta sababta dhabta ah ayaa ah in waxyaabo badan oo organic ah lagu nuugi doono walxaha sibidhka iyo alaabta fuuq-celinta, ka hortagga kala dirista walxaha sibidhka iyo crystallization-ka alaabada fuuq-celinta, si loo dib u dhigo fuuq-celinta iyo isku-buufinta sibidhka. Pourchez et al. waxay ogaadeen in ethers cellulose si fudud loogu nuugo dusha sare ee alaabta fuuq-celinta sida kalsiyum hydroxide, jel CSH iyo calcium aluminate hydrate, laakiin si fudud looguma nuugin marxaladaha ettringite iyo kuwa aan fuuq-baxa lahayn. Intaa waxaa dheer, marka la eego cellulose ether, awoodda nuugista ee HEC way ka xoog badan tahay tan bararka MC. Inta ay le'eg tahay heerka hydroxyethyl ee HEC ama hydroxypropyl eeHPMC, awoodda nuugista oo xoog badan: marka laga hadlayo alaabada nuugista, awoodda nuugista ee kalsiyum hydroxide ayaa ka xoog badan tan CSH. Falanqayn dheeraad ah ayaa sidoo kale muujinaysa in awoodda nuugista ee alaabada fuuq-celinta iyo cellulose ether ay la xiriirto dib u dhaca fuuq-celinta sibidhka: nuugista oo xoog badan, dib u dhaca ayaa sii cad, laakiin nuugista ettringite ee cellulose ether waa daciif, laakiin sameysmaheeda, laakiin tani si weyn ayay u dib u dhacday. cellulose ether ee tricalcium silicate iyo alaabteeda fuuq-celinta waxay leedahay nuugid xooggan, si cad ayay u dib u dhigaysaa habka fuuq-celinta ee marxaladda silicate, xaddiga nuugista ee ettringite aad ayuu u hooseeyaa, laakiin sameynta ettringite ee dib u dhacday waa mid cad, sababtoo ah dib u dhaca sameynta ettringite waxaa saameeya dheelitirka Ca2+ ee xalka, waa kordhinta ether cellulose. Fuuq-celinta silicate ee dambe ayaa sii socotay.
Kuwani waa mabda'a fuuq-celinta cement-ka ee hydroxypropyl methyl cellulose. Waxaan rajeyneynaa in aqoontani ay u sahlayso qof walba inuu fahmo sida badeecadu u shaqeyso oo uu si fiican u isticmaalo.
Waqtiga boostada: Abriil-26-2024