Imiterere ya hydroxypropyl methylcellulose

Hydroxypropyl methylcellulose ni ubwoko bwa ether ivanze na cellulose itari ionic. Bitandukanye na ether ivanze na methyl carboxymethyl cellulose ya ionic, ntabwo ihura n'ibyuma bikomeye. Bitewe n'ibipimo bitandukanye by'ingano ya methoxyl n'ingano ya hydroxypropyl muri hydroxypropyl methylcellulose n'ubucucike butandukanye, hari ubwoko bwinshi bufite imiterere itandukanye, urugero, ingano nyinshi ya methoxyl n'ingano nke ya hydroxypropyl. Imikorere yayo iri hafi y'iya methyl cellulose, mu gihe ingano nke ya methoxyl n'ingano nyinshi ya hydroxypropyl iri hafi y'iya hydroxypropyl methyl cellulose. Ariko, muri buri bwoko, nubwo hari ingano ntoya ya hydroxypropyl cyangwa ingano nto ya methoxyl, hari itandukaniro rikomeye mu gushonga mu binyabutabire cyangwa ubushyuhe bwa flocculation mu bisubizo by'amazi.

(1) Imiterere y'ingufu za hydroxypropyl methylcellulose
①Ubushonge bwa hydroxypropyl methylcellulose mu mazi Hydroxypropyl methylcellulose mu by’ukuri ni ubwoko bwa methylcellulose yahinduwe na propylene oxide (methoxypropylene), bityo iracyafite imiterere imwe na methyl cellulose Cellulose ifite imiterere isa n’iy’amazi akonje n’iy’amazi ashyushye. Ariko, bitewe n’itsinda rya hydroxypropyl ryahinduwe, ubushyuhe bwayo bwo gukaraba mu mazi ashyushye buri hejuru cyane ugereranije n’ubwa methyl cellulose. Urugero, ubushyuhe bwa hydroxypropyl methylcellulose amazi afite 2% methoxy content substitution degree DS=0.73 n’ubushonge bwa hydroxypropyl MS=0.46 ni 500 mpa·s kuri 20°C, kandi ubushyuhe bwayo bwa gel bushobora kugera hafi kuri 100°C, mu gihe methyl cellulose ku bushyuhe bumwe ari hafi 55°C gusa. Ku bijyanye no gukaraba kwayo mu mazi, nayo yararushijeho kuba nziza cyane. Urugero, hydroxypropyl methylcellulose yavunitse (ifite ishusho y'urusenda 0.2 ~ 0.5mm kuri 20°C ifite ubushyuhe bwa 4% bw'amazi ya 2pa•s irashobora kugurwa kuri ubushyuhe bw'icyumba, byoroshye gushonga mu mazi nta gukonjesha.

②Gushonga kwa hydroxypropyl methylcellulose mu bintu biyungurura ibinyabuzima Uburyo bwo gushonga kwa hydroxypropyl methylcellulose mu bintu biyungurura ibinyabuzima nabwo ni bwiza kuruta ubwa methylcellulose. Ku bicuruzwa biri hejuru ya 2.1, hydroxypropyl methylcellulose ifite viscosity nyinshi irimo hydroxypropyl MS = 1.5 ~ 1.8 na methoxy DS = 0.2 ~ 1.0, hamwe n'urwego rwose rwo gusimbuza ruri hejuru ya 1.8, irashonga mu bisubizo bya methanoli na ethanoli. Irashonga mu buryo buciriritse, kandi irashonga mu mazi. Irashonga kandi mu bisubizo bya hydrocarboni bya chlorine nka methylene chloroform na chloroform, hamwe n'ibisubizo by'umwimerere nka acetone, isopropanol na diacetone alcohol. Uburyo bwo gushonga kwayo mu bintu biyungurura ibinyabuzima buruta uburyo bwo gushonga mu mazi.

(2) Ibintu bigira ingaruka ku bushyuhe bwa hydroxypropyl methylcellulose Uburyo busanzwe bwo kumenya ubushyuhe bwa hydroxypropyl methylcellulose ni bumwe n’ubundi bwoko bwa ether za cellulose, kandi bupimirwa kuri 20°C hakoreshejwe umuti w’amazi wa 2% nk’uko bisanzwe. Ubushyuhe bw’umusaruro umwe bwiyongera uko ubushyuhe bwiyongera. Ku bicuruzwa bifite uburemere butandukanye bwa molekile ku bushyuhe bumwe, umusaruro ufite uburemere bunini bwa molekile uba ufite ubushyuhe bwinshi. Isano yawo n’ubushyuhe isa n’iya methyl cellulose. Iyo ubushyuhe buzamutse, ubushyuhe butangira kugabanuka, ariko iyo bugeze ku bushyuhe runaka, ubushyuhe buhita bwiyongera kandi hakavuka ubushyuhe. Ubushyuhe bwa gel bw’ibicuruzwa bifite ubushyuhe buke buri hejuru. Agace ka gel ntabwo gafitanye isano gusa n’ubushyuhe bwa ether, ahubwo kandi gafitanye isano n’ikigereranyo cy’imiterere ya methoxyl group n’itsinda rya hydroxypropyl muri ether n’ingano y’igipimo cyose cyo gusimbuza. Tugomba kumenya ko hydroxypropyl methylcellulose nayo ari pseudoplastic, kandi umuti wayo uhoraho ku bushyuhe bw’icyumba nta kwangirika kwa viscosity uretse ko hashobora kwangirika kwa enzyme.

(3) Uburyo umunyu wihanganira hydroxypropyl methylcellulose Kubera ko hydroxypropyl methylcellulose ari ether itari ioni, ntabwo ihinduka iyoni mu mazi, bitandukanye n'izindi ether za ionic cellulose, Urugero, carboxymethyl cellulose ikorana na iyoni z'icyuma gikomeye kandi igasohoka mu gisubizo. Umunyu rusange nka chloride, bromide, fosfeti, nitrate, n'ibindi ntabwo bizahinduka iyo byongewe mu gisubizo cyayo cy'amazi. Ariko, kongeramo umunyu bigira ingaruka ku bushyuhe bwa flocculation bw'igisubizo cyayo cy'amazi. Iyo igipimo cy'umunyu cyiyongera, ubushyuhe bwa gel buragabanuka. Iyo igipimo cy'umunyu kiri munsi y'aho flocculation igeze, ubushyuhe bw'igisubizo bukunda kwiyongera. Kubwibyo, ingano runaka y'umunyu irashyirwa. , mu ikoreshwa, ishobora kugera ku bukungu. Kubwibyo, mu ikoreshwa rimwe na rimwe, ni byiza gukoresha uruvange rwa ether ya cellulose n'umunyu kuruta igipimo kinini cya ether kugira ngo ugere ku bunini.

(4) Aside ya Hydroxypropyl methylcellulose n'ubudahangarwa bwa alkali. Hydroxypropyl methylcellulose muri rusange irahamye kuri aside na alkali, kandi ntabwo ihinduka mu rugero rwa pH 2 ~ 12. Ishobora kwihanganira ingano runaka ya aside zoroheje, nka aside formic, aside acetic, aside citric, aside succinic, aside fosforic, aside boric, nibindi. Ariko aside yibumbiyemo ifite ingaruka zo kugabanya ubukana. Alkali nka caustic soda, caustic potash n'amazi y'indimu nta ngaruka bigira kuri yo, ariko zishobora kongera ubukana bw'umuti, hanyuma zikawugabanya buhoro buhoro.

(5) Uburyo hydroxypropyl methylcellulose Isosi ya hydroxypropyl methylcellulose ishobora kuvangwa n'ibinyabutabire bya polymer bishongera mu mazi kugira ngo habeho igisubizo kimwe kandi kibonerana gifite ubukana bwinshi. Ibinyabutabire bya polymer birimo polyethylene glycol, polyvinyl acetate, polysilicone, polymethylvinylsiloxane, hydroxyethyl cellulose, na methyl cellulose. Ibinyabutabire bifite molekile nyinshi nka gum arabic, locustbean gum, karaya gum, nibindi nabyo bihuye neza n'uburyo ikoreshwa. Hydroxypropyl methylcellulose ishobora kandi kuvangwa na mannitol ester cyangwa sorbitol ester ya aside stearic cyangwa aside palmitic, kandi ishobora kandi kuvangwa na glycerin, sorbitol na mannitol, kandi ibi binyabutabire bishobora gukoreshwa nka hydroxypropyl methylcellulose Plasticizer kuri cellulose.

(6) Eteri za selulosi zishonga mu mazi zidashobora gushonga za hydroxypropyl methylcellulose zishobora gukora cross-linking yo hejuru na aldehydes, bityo izi eteri zishonga mu mazi zigashyirwa mu gisubizo kandi ntizishonge mu mazi. Aldehydes zituma hydroxypropyl methylcellulose idashonga zirimo formaldehyde, glyoxal, succinic aldehyde, adipaldehyde, nibindi. Mu gihe ukoresha formaldehyde, ugomba kwita cyane ku gaciro ka pH k'igisubizo, muri byo glyoxal ikora vuba, bityo glyoxal ikoreshwa cyane nk'igikoresho cyo guhuza mu nganda. Ingano y'ubu bwoko bw'igikoresho cyo guhuza mu gisubizo ni 0.2% ~ 10% by'uburemere bwa ether, byaba byiza 7% ~ 10%, urugero, 3.3% ~ 6% bya glyoxal ni byo bikwiriye cyane. Muri rusange, ubushyuhe bwo kuvura ni 0 ~ 30℃, kandi igihe ni iminota 1 ~ 120. Uburyo bwo guhuza bugomba gukorwa mu gihe hari aside. Muri rusange, umuti ubanza kongerwamo aside ikomeye idakora cyangwa aside karubokisilike y’umwimerere kugira ngo pH y’umuti ihindurwe kuri 2 ~ 6, byaba byiza hagati ya 4 ~ 6, hanyuma wongeremo aldehydes kugira ngo habeho reaction cross-linking. Aside ikoreshwa ifite aside hydrochloric, aside sulfuric, aside phosphoric, aside formic, aside asetic, aside hydroxyacetic, aside succinic cyangwa aside citric nibindi, aho hamwe na aside formic cyangwa aside asetic ari byiza, kandi aside formic ni nziza cyane. Aside na aldehyde bishobora kandi kongerwamo icyarimwe kugira ngo umuti ugere kuri reaction cross-linking mu rugero rwa pH rwifuzwa. Iyi reaction ikunze gukoreshwa mu gikorwa cya nyuma cyo gutunganya mu gutegura ether za cellulose. Iyo ether ya cellulose idashongeshejwe, biroroshye kuyikoresha

Amazi afite ubushyuhe bwa 20~25°C yo koza no gusukura. Iyo icyo gicuruzwa kiri gukoreshwa, ibintu birimo alkali bishobora kongerwa mu gisubizo cy'icyo gicuruzwa kugira ngo pH y'icyo gisubizo ihinduke alkali, kandi icyo gisubizo kizashonga vuba. Ubu buryo bukoreshwa no mu gutunganya firime nyuma y'uko umuti wa eteri ya cellulose ukozwemo firime kugira ngo ube firime idashonga.

(7) Ubudahangarwa bwa enzyme ya hydroxypropyl methylcellulose Mu by’ukuri, ibintu bikomoka kuri cellulose, nk’itsinda rifatanye neza kuri buri tsinda rya anhydroglucose, ntibishobora kwangirika, ariko mu by’ukuri, iyo agaciro k’umusaruro karangiye karenze 1, kazangirika na enzymes, bivuze ko urwego rwo gusimbuza buri tsinda ku ruhererekane rwa cellulose rudahagije, kandi mikorobe zishobora kwangirika ku itsinda rya anhydroglucose ritasimbuwe. Isukari irakorwa kandi ikayinjizwa nk’intungamubiri za mikorobe. Kubwibyo, niba urwego rwo gusimbuza cellulose ether rwiyongera, ubudahangarwa bwo kwangirika kwa enzyme ya cellulose ether nabwo buziyongera. Nk’uko raporo zibigaragaza, mu gihe cy’igenzura, ingaruka za hydrolysis z’imisemburo, ubukana busigaye bwa hydroxypropyl methylcellulose (DS = 1.9) ni 13.2%, methylcellulose (DS = 1.83) ni 7.3%, methylcellulose (DS = 1.66) ni 3.8%, na hydroxyethyl cellulose ni 1.7%. Bigaragara ko hydroxypropyl methylcellulose ifite ubushobozi bukomeye bwo kurwanya enzymes. Kubwibyo, hydroxypropyl methylcellulose ifite ubushobozi bwo kurwanya enzymes. Kubwibyo, hydroxypropyl methylcellulose ifite ubudahangarwa bwiza bwa enzymes, hamwe n’ubushobozi bwayo bwiza bwo gukwirakwira, gukomera no gukora filime, ikoreshwa mu gupfuka amazi, nibindi, kandi muri rusange ntabwo ikeneye kongeramo ibintu bibungabunga. Ariko, kugira ngo umuti ubikwe igihe kirekire cyangwa bishobora kwanduzwa n’inyuma, ibintu bibungabunga bishobora kongerwaho nk'uburyo bwo kwirinda, kandi amahitamo ashobora kugenwa hakurikijwe ibisabwa bya nyuma by’umuti. Phenylmercuric acetate na manganese fluorosilicate ni ibintu bibungabunga neza, ariko byose bifite uburozi, bigomba kwitabwaho ku mikorere. Muri rusange, 1-5mg ya acetate ya phenylmercury ishobora kongerwamo umuti kuri litiro imwe y'igipimo.

(8) Imikorere ya filime ya hydroxypropyl methylcellulose Hydroxypropyl methylcellulose ifite ubushobozi bwiza bwo gukora filime. Umuti wayo w'amazi cyangwa umuti wa organic solvent upfukwa ku isahani y'ikirahure, kandi uba udafite ibara nyuma yo kuma. Fime ifite ibara, ibonerana kandi ikomeye. Ifite ubushobozi bwo kwihanganira ubushuhe kandi ikomeza gukomera ku bushyuhe bwinshi. Iyo hongewemo plasticizer ya hygroscopic, uburebure bwayo n'ubushobozi bwayo bworoshye bishobora kwiyongera. Mu bijyanye no kunoza ubworoherane, plasticizer nka glycerin na sorbitol ni byo bikwiriye cyane. Muri rusange, ingano y'umuti ni 2% ~ 3%, kandi ingano ya plasticizer ni 10% ~ 20% ya ether ya cellulose. Iyo plasticizer iri hejuru cyane, colloidal dehydration igabanuka iyo hari ubushuhe bwinshi. Ingufu zo gukurura za filime iyo hongeweho plasticizer ni nini cyane kuruta iyo hatarimo plasticizer, kandi ziyongera uko ingano yiyongereye. Ku bijyanye na hygroscopicity ya filime, nayo iriyongera uko ingano ya plasticizer yiyongera.