Hydroxypropylmethylcellulose

Incamake: byitwa HPMC, cyera cyangwa kitari cyera fibrous cyangwa ifu ya granular. Hariho ubwoko bwinshi bwa selile kandi burakoreshwa cyane, ariko duhura cyane nabakiriya mu nganda zubaka ifu yumye. Cellulose ikunze kugaragara yerekeza kuri hypromellose.

Igikorwa cyo kubyaza umusaruro: Ibikoresho nyamukuru bya HPMC: ipamba itunganijwe, methyl chloride, okiside ya propylene, ibindi bikoresho fatizo birimo flake alkali, aside, toluene, isopropanol, nibindi. Shira fibre ya alkali mumasafuriya ya etherification, ongeramo okiside ya propylene na methyl chloride, hanyuma etherify kuri 50-80 ° C mumasaha 5, hamwe numuvuduko mwinshi wa 1.8 MPa. Noneho shyiramo urugero rukwiye rwa acide hydrochloric na aside oxyde mumazi ashyushye kuri 90 ° C kugirango woze ibikoresho kugirango wagure amajwi. Umwuma hamwe na centrifuge. Karaba kugeza utabogamye, kandi mugihe ubuhehere buri mubikoresho buri munsi ya 60%, byumisha hamwe numwuka ushushe kuri 130 ° C kugeza munsi ya 5%. Imikorere: kubika amazi, kubyimba, thixotropic anti-sag, gukora-umwuka, gukora neza.

Kubika amazi: Kubika amazi numutungo wingenzi wa selile ya ether! Mubikorwa bya putty gypsum mortar nibindi bikoresho, selile ya ether ikoreshwa ni ngombwa. Kugumana amazi menshi birashobora gukora neza ivu rya sima na calcium gypsumu (uko bigenda neza, niko imbaraga). Mubihe bimwe, uko ubukonje bwa ether ya selile yiyongera, niko gufata amazi neza (ikinyuranyo kiri hejuru ya 100.000 viscosity kiragabanuka); hejuru ya dosiye, niko gufata amazi neza, mubisanzwe umubare muto wa selulose ether irashobora kuzamura cyane imikorere ya minisiteri. Igipimo cyo gufata amazi, iyo ibirimo bigeze kurwego runaka, inzira yo kongera igipimo cyo gufata amazi iba gahoro; igipimo cyo gufata amazi ya selile ya selile ubusanzwe kigabanuka mugihe ubushyuhe bwibidukikije bwiyongereye, ariko ethers zimwe na zimwe za selile nyinshi na selile zifite imikorere myiza mugihe cy'ubushyuhe bwinshi. Kubika amazi. Gutandukana hagati ya molekile zamazi na selile ya ether ya molekuline ituma molekile zamazi zinjira imbere muminyururu ya selulose ether macromolecular kandi zigahabwa imbaraga zikomeye zihuza, bityo zigakora amazi yubusa, amazi yiziritse, no kunoza amazi yo gufata neza sima.

Umubyimba, thixotropic na anti-sag: itanga ububobere buhebuje kuri minisiteri itose! Irashobora kongera cyane gufatana hagati ya minisiteri itose hamwe nigitereko fatizo, no kunoza imikorere yo kurwanya kugabanuka. Ingaruka yibyibushye ya selile ya selile nayo yongerera imbaraga zo gukwirakwiza no kuryamana kw'ibikoresho bishya bivanze, birinda gusibanganya ibintu, gutandukanya no kuva amaraso. Ingaruka yibyibushye bya selile ya selile kubikoresho bishingiye kuri sima biva mubwiza bwibisubizo bya selile. Mubihe bimwe, niko hejuru ya viscosity ya selulose ether, niko arushaho kuba mwiza wibikoresho byahinduwe na sima, ariko niba ibishishwa ari binini cyane, bizagira ingaruka kumikorere no mumikorere yibikoresho (nka trowel ifatanye na scraper). akazi). Kwiyubaka-minisiteri no kwikuramo beto isaba amazi menshi bisaba ubukonje buke bwa selile ether. Byongeye kandi, umubyibuho ukabije wa selulose ether bizongera amazi yibikoresho bishingiye kuri sima kandi byongere umusaruro wa minisiteri. Umuvuduko mwinshi wa selulose ether amazi yo mumazi afite thixotropy nyinshi, nayo nikintu gikomeye kiranga selile. Amazi yo mumazi ya selile afite ubusanzwe afite pseudoplastique, itari thixotropique itemba munsi yubushyuhe bwa gel, ariko imitekerereze ya Newtonian ku gipimo gito. Pseudoplastique yiyongera hamwe no kongera uburemere bwa molekuline cyangwa kwibumbira hamwe kwa selile. Gele yubaka ikorwa mugihe ubushyuhe bwiyongereye, kandi umuvuduko mwinshi wa thixotropique. Ether ya selile ifite imbaraga nyinshi hamwe nubukonje buke bwerekana thixotropy ndetse no munsi yubushyuhe bwa gel. Uyu mutungo ufite inyungu nyinshi mukubaka inyubako ya minisiteri kugirango uhindure urwego na sag. Aha twakwibutsa ko uko ubukana bwa ether ya selulose bugenda bwiyongera, niko gufata amazi neza, ariko uko ubukonje bugenda bwiyongera, niko uburemere bwa molekuline bugereranije na selile ya selile, hamwe no kugabanuka gukwiranye kwayo, ibyo bikaba bigira ingaruka mbi kumyuka ya minisiteri no gukora.

Impamvu: Cellulose ether ifite ingaruka zigaragara zo guhumeka kubintu bishya bishingiye kuri sima. Ether ya selile ifite itsinda rya hydrophilique (hydroxyl group, ether group) hamwe na hydrophobique groupe (methyl group, glucose ring), ni surfactant, ifite ibikorwa byubutaka, bityo ikagira ingaruka zo guhumeka. Ingaruka yinjira mu kirere ya selile ya selile izatanga umusaruro "umupira", ushobora kunoza imikorere yimikorere yibintu bishya bivanze, nko kongera plastike no koroha kwa minisiteri mugihe ikora, ifasha mugutunganya minisiteri; bizongera kandi umusaruro wa minisiteri. , kugabanya ikiguzi cy'umusaruro wa minisiteri; ariko bizongera ubukana bwibintu byakomye kandi bigabanye imiterere yubukorikori nkimbaraga na moderi ya elastique. Nka surfactant, selulose ether nayo igira ingaruka zo guhanagura cyangwa gusiga amavuta kumasima ya sima, hamwe ningaruka zayo zo guhumeka byongera umuvuduko wibikoresho bishingiye kuri sima, ariko ingaruka zabyo zizagabanya umuvuduko. Ingaruka yo gutembera ni ihuriro rya plastike ningaruka zo kubyimba. Iyo ibikubiye muri selile ya selile ari bike cyane, bigaragarira cyane nka plastike cyangwa kugabanya amazi; iyo ibirimo ari byinshi, ingaruka zo kwiyongera kwa selile ya selile yiyongera vuba, kandi ingaruka zayo zo guhumeka zikunda kuba zuzuye, bityo imikorere ikiyongera. Ingaruka yibyibushye cyangwa kongera amazi.

Gushiraho kudindiza: Cellulose ether irashobora gutinza inzira ya hydrata ya sima. Ethers ya selile iha minisiteri ibintu bitandukanye byingirakamaro, kandi ikanagabanya ubushyuhe bwa hydrata hakiri kare ya sima kandi bigatinda inzira ya hydration kinetic ya sima. Ibi ntabwo ari byiza gukoresha minisiteri mukarere gakonje. Uku kudindira guterwa na adsorption ya selile ya selile ya selile kubicuruzwa bitanga amazi nka CSH na ca (OH) 2. Bitewe no kwiyongera kwijimye ryumuti wa pore, ether ya selile igabanya umuvuduko wa ion mugisubizo, bityo bikadindiza inzira ya hydration. Iyo hejuru ya selulose ether yibikoresho bya minerval gel, niko bigaragara ingaruka zo gutinda kwa hydration. Ether ya selulose ntabwo isubiza inyuma gusa, ahubwo inadindiza inzira yo gukomera ya sisitemu ya minisiteri. Ingaruka zo kudindiza selile ya selile ntabwo ziterwa gusa nubunini bwayo muri sisitemu ya minerval gel, ahubwo biterwa nuburyo bwimiti. Urwego rwo hejuru rwa methylation ya HEMC, nibyiza ingaruka zo kudindiza selile. Ingaruka yo kudindira irakomeye. Nyamara, ubwiza bwa selulose ether nta ngaruka nini bugira kuri hydration kinetics ya sima. Hamwe no kwiyongera kwa selile ya ether, igihe cyo gushiraho minisiteri cyiyongera cyane. Hariho isano ryiza ridafite umurongo hagati yigihe cyambere cyo gushiraho minisiteri nibiri muri selile ya ether, kandi igihe cyanyuma cyo gushiraho gifite umurongo mwiza uhuza nibiri muri selile. Turashobora kugenzura igihe cyo gukora cya minisiteri duhindura ibiri muri selile. Mu bicuruzwa, igira uruhare mu gufata amazi, kubyimba, gutinda ingufu za sima, no kunoza imikorere yubwubatsi. Ubushobozi bwiza bwo gufata amazi butuma sima gypsum ivu ya calcium ikora cyane, ikongerera cyane ububobere butose, ikongerera imbaraga za minisiteri, kandi mugihe kimwe irashobora kuzamura neza imbaraga zingutu nimbaraga zogosha, bikazamura cyane mubikorwa byubwubatsi no gukora neza. Igihe cyagenwe. Itezimbere spray cyangwa pumpability ya minisiteri, kimwe nimbaraga zubaka. Mubikorwa nyabyo byo gusaba, birakenewe kumenya ubwoko, ubwiza, nubunini bwa selile ukurikije ibicuruzwa bitandukanye, ingeso zubwubatsi, nibidukikije.