Hydroxypropyl methylcellulose (HPMC)ni eteri ivanze na cellulose idashonga mu mazi kandi idafite ionic. Igaragara neza ni ifu y'umweru cyangwa umuhondo muto cyangwa ibintu bifite granular, nta buryohe, nta mpumuro, ntabwo ari uburozi, irahinduka mu buryo bwa shimi, kandi ishonga mu mazi kugira ngo ikore umuti woroshye, ubonerana kandi urimo uburyaryate. Imwe mu miterere y'ingenzi ya hydroxypropyl methylcellulose ikoreshwa ni uko yongera ubukana bw'amazi. Ingaruka zo gukomera biterwa n'urugero rwa polymerization (DP) y'umusaruro, ingano ya cellulose ether mu gisubizo cy'amazi, igipimo cyo gukata, n'ubushyuhe bw'umuti. N'ibindi bintu.
01
Ubwoko bw'amazi y'umuti w'amazi wa HPMC
Muri rusange, umuvuduko w'amazi mu gutembera kw'amazi ushobora kugaragazwa nk'aho ari urwego rw'umuvuduko w'amazi gusa ƒ (γ), igihe cyose bitajyanye n'igihe. Bitewe n'imiterere ya ƒ (γ), amazi ashobora kugabanywamo ubwoko butandukanye, ari bwo: amazi ya Newtonian, amazi yagutse, amazi ya pseudoplastic na pulasitiki ya Bingham.
Eteri za selulosi zigabanyijemo ibice bibiri: kimwe ni eteri ya selulosi itari ioni n'ikindi ni eteri ya selulosi ioni. Ku bijyanye n'uburyo ubwo bwoko bubiri bwa eteri za selulosi bumeze. SC Naik n'abandi bakoze ubushakashatsi burambuye kandi bunoze ku bijyanye n'ibisubizo bya hydroxyethyl cellulose na sodium carboxymethyl cellulose. Ibisubizo byagaragaje ko ibisubizo bya eteri bya selulosi bitari ioni n'ibisubizo bya eteri bya selulosi ioni byari pseudoplastic. Inzira, ni ukuvuga inzira zitari Newtonian, zerekeza ku binyabutabire bya Newtonian gusa ku gipimo gito cyane. Pseudoplasticity y'igisubizo cya hydroxypropyl methylcellulose igira uruhare runini mu ikoreshwa. Urugero, iyo ikoreshejwe mu gupfuka, bitewe n'imiterere y'ibisubizo by'amazi, viscosity y'igisubizo igabanuka uko umuvuduko wo gupfuka, bituma ibice bya pigment bitatana neza, kandi byongera ubushuhe bw'igisubizo. Ingaruka ni nini cyane; mu gihe iruhutse, viscosity y'igisubizo iba nini, ibyo bikabuza ko ibice bya pigment byinjira mu gupfuka.
02
Uburyo bwo gupima ubukana bwa HPMC
Igipimo cy'ingenzi cyo gupima ingaruka zo gukomera kwa hydroxypropyl methylcellulose ni ubukana bugaragara bw'umuti w'amazi. Uburyo bwo gupima ubukana bugaragara burimo uburyo bwa viscosity ya capillary, uburyo bwa viscosity bwo kuzunguruka n'uburyo bwa viscosity ya falling ball.
aho: ni ubucucike bugaragara, mPa s; K ni viscometer ihoraho; d ni ubucucike bw'icyitegererezo cy'umuti kuri 20/20°C; t ni igihe umuti unyura mu gice cyo hejuru cya viscometer ukagera ku kimenyetso cyo hasi, s; Igihe amavuta asanzwe anyura muri viscometer gipimwa.
Ariko, uburyo bwo gupima hakoreshejwe viscometer ya capillary buragoye cyane. Ubukana bwa benshieteri za seluloseBiragoye gusesengura hakoreshejwe viscometer ya capillary kuko ibi bisubizo birimo ingano nto y'ibintu bidashonga bigaragazwa gusa iyo viscometer ya capillary ifunze. Kubwibyo, abakora benshi bakoresha viscometer zizunguruka kugira ngo bagenzure ubuziranenge bwa hydroxypropyl methylcellulose. Viscometer za Brookfield zikunze gukoreshwa mu bihugu by'amahanga, naho viscometer za NDJ zikoreshwa mu Bushinwa.
03
Ibintu bigira ingaruka ku bucucike bwa HPMC
3.1 Isano n'urwego rw'iteranya
Iyo ibindi bipimo bidahindutse, ubukana bw'umuti wa hydroxypropyl methylcellulose bungana n'urugero rwa polymerization (DP) cyangwa uburemere bwa molekile cyangwa uburebure bw'uruhererekane rwa molekile, kandi bwiyongera uko urugero rwa polymerization rwiyongera. Iyi ngaruka igaragara cyane mu gihe cy'urugero ruto rwa polymerization kuruta mu gihe cy'urwego rwo hejuru rwa polymerization.
3.2 Isano iri hagati y'ubukana n'ubwinshi
Uburemere bwa hydroxypropyl methylcellulose buriyongera uko ubwinshi bw'ibicuruzwa byiyongera mu gisubizo cy'amazi. Ndetse n'impinduka ntoya y'uburemere itera impinduka nini mu buremere. Uburemere bwa hydroxypropyl methylcellulose Ingaruka z'impinduka z'uburemere bw'ibisubizo ku buremere bw'ibisubizo zirushaho kugaragara.
3.3 Isano iri hagati y'ubukana n'igipimo cyo gukata
Umuti wo mu mazi wa Hydroxypropyl methylcellulose ufite ubushobozi bwo kugabanya ubushyuhe. Hydroxypropyl methylcellulose ifite ubushyuhe butandukanye itegurwa mu gipimo cy’amazi cya 2%, kandi ubushyuhe bwayo ku gipimo gitandukanye cyo gukata bupimirwa uko bikurikirana. Ibisubizo ni ibi bikurikira Nkuko bigaragara ku ishusho. Ku gipimo gito cyo gukata, ubushyuhe bwa hydroxypropyl methylcellulose ntibwahindutse cyane. Uko igipimo cyo gukata cyazamutse, ubushyuhe bwa hydroxypropyl methylcellulose ifite ubushyuhe bwinshi bwazamutse cyane, mu gihe umuti ufite ubushyuhe buke utagabanutse cyane.
3.4 Isano iri hagati y'ubushyuhe n'ubukonje
Ubushyuhe bw'umuti wa hydroxypropyl methylcellulose bugira ingaruka zikomeye ku bushyuhe. Uko ubushyuhe bwiyongera, ubushyuhe bw'umuti bugabanuka. Nk'uko bigaragara ku ishusho, utegurwa mu gisubizo cy'amazi gifite igipimo cya 2%, kandi impinduka z'ubushyuhe hamwe n'ubwiyongere bw'ubushyuhe zirapimwa.
3.5 Ibindi bintu bigira ingaruka ku buzima
Ubushyuhe bw'umuti wo mu mazi wa hydroxypropyl methylcellulose nabwo bugira ingaruka ku bintu biyongera mu muti, agaciro ka pH k'umuti, no kwangirika kwa mikorobe. Ubusanzwe, kugira ngo haboneke imikorere myiza ya viscosity cyangwa kugabanya ikiguzi cyo gukoresha, ni ngombwa kongeramo ibintu bihindura rheology, nk'ibumba, ibumba ryahinduwe, ifu ya polymer, starch ether na aliphatic copolymer, ku muti wo mu mazi wa hydroxypropyl methylcellulose., kandi electrolytes nka chloride, bromide, phosphate, nitrate, n'ibindi nabyo bishobora kongerwa ku muti wo mu mazi. Izi nyongera ntizigira ingaruka gusa ku miterere ya viscosity y'umuti wo mu mazi, ahubwo zizagira ingaruka no ku yindi miterere ya hydroxypropyl methylcellulose nko kubika amazi., ubudahangarwa bwo kugabanuka, nibindi.
Ubushyuhe bw'amazi ya hydroxypropyl methylcellulose ntibugira ingaruka ku aside na alkali, kandi muri rusange buhora buri hagati ya 3 na 11. Bushobora kwihanganira aside nkeya runaka, nka aside formike, aside asetiki, aside fosforike, aside boric, aside citric, nibindi. Ariko, aside yikubise izagabanya ubushyuhe. Ariko soda caustic, potassium hydroxide, amazi y'indimu, nibindi bigira ingaruka nke kuri byo. Ugereranyije n'izindi ether za cellulose,hydroxypropyl methylcelluloseUmuti w’amazi ufite ubushobozi bwo kurwanya mikorobe, impamvu nyamukuru ni uko hydroxypropyl methylcellulose ifite amatsinda adafite ubushobozi bwo gusimbuza ibintu hamwe n’imbogamizi ku matsinda. Ariko, kubera ko uburyo bwo gusimbuza ibintu akenshi budasa, igice cya anhydroglucose kidasimbuwe cyoroshye kwangirika na mikorobe, bigatuma molekile za cellulose ether zisenyuka ndetse n’uruhererekane rw’imitsi. Umusaruro ni uko ubukana bugaragara bw’umuti w’amazi bugabanuka. Niba bibaye ngombwa kubika umuti w’amazi wa hydroxypropyl methylcellulose igihe kirekire, ni byiza kongeramo ingano y’umuti urwanya mikorobe kugira ngo ubukana budahinduka cyane. Mu gihe uhitamo imiti irwanya mikorobe, imiti irinda imitsi cyangwa imiti irwanya imitsi, ugomba kwita ku mutekano, kandi ugahitamo ibintu bidafite uburozi ku mubiri w’umuntu, bifite imiterere ihamye kandi bidafite impumuro mbi, nka DOW Chem's AMICAL fungicides, imiti irinda imitsi ya CANGUARD64, imiti irinda imitsi ya FUELSAVER n’ibindi bicuruzwa, bishobora kugira uruhare rungana nabyo.
Igihe cyo kohereza: 28 Mata 2024