Selulose ya methyl hydroxyethyl itegurwa ite?

Amavu n'amavuko n'incamake

Cellulose ether ni igikoresho cya polymer cyiza gikoreshwa cyane gikozwe muri cellulose karemano ya polymer binyuze mu kuvura imiti. Nyuma yo gukora nitrati ya cellulose na acetate ya cellulose mu kinyejana cya 19, abahanga mu bya shimi bakoze urukurikirane rw'ibikomoka kuri cellulose bya ether nyinshi za cellulose, kandi amashami mashya y'ikoreshwa yagiye avumburwa buri gihe, akoreshwa mu nzego nyinshi z'inganda. Ibicuruzwa bya ether ya cellulose nka sodiumselulose ya karboksimetili (CMC), selulose ya ethyl (EC), selulose ya hydroxyethyl (HEC), selulose ya hydroxypropyl (HPC), selulose ya methyl hydroxyethyl (MHEC)naselulose ya methyl hydroxypropyl (MHPC)n'izindi eteri za selulosi zizwi nka "monosodium glutamate y'inganda" kandi zakoreshejwe cyane mu gucukura amavuta, kubaka, gusiga irangi, ibiryo, imiti n'imiti ya buri munsi.

Hydroxyethyl methyl cellulose (MHPC) ni ifu yera idahumura, idasembuye, idahumanya ishobora gushonga mu mazi akonje kugira ngo ikore umuti ubonerana. Ifite imiterere yo gukomera, gufatanya, gukwirakwiza, gukurura, gukora filime, guhagarika, gukurura, gukoresha gel, gukora ku buso, kubungabunga ubushuhe no kurinda colloid. Bitewe n'imikorere y'umuti w'amazi ku buso, ishobora gukoreshwa nk'umuti urinda colloid, emulsifier na dispersant. Umuti w'amazi wa Hydroxyethyl methylcellulose ufite ubushobozi bwo kuvura amazi neza kandi ni umuti mwiza wo kubika amazi. Kubera ko hydroxyethyl methylcellulose irimo amatsinda ya hydroxyethyl, ifite ubushobozi bwiza bwo kurwanya ubwivumbure, igumana ubukana bwiza kandi irwanya ubwivumbure mu gihe kirekire.

Hydroxyethyl methylcellulose (HEMC) itegurwa hifashishijwe uburyo bwa ethylene oxide substituents (MS 0.3 ~ 0.4) muri methylcellulose (MC), kandi umunyu wayo urwanya neza kurusha polimeri zitarahinduka. Ubushyuhe bwa methylcellulose nabwo buri hejuru y’ubwa MC.

Imiterere

Ikiranga

Ibintu by'ingenzi biranga hydroxyethyl methylcellulose (HEMC) ni ibi bikurikira:

1. Gushonga: Bishobora gushonga mu mazi no mu bintu bimwe na bimwe by’umwimerere. HEMC ishobora gushonga mu mazi akonje. Ingano yayo nini igenwa gusa n’ubushyuhe. Gushonga biratandukana bitewe n’ubushyuhe. Uko ubushyuhe bugabanuka, niko gushonga birushaho kuba byinshi.

2. Ubudahangarwa bw'umunyu: Ibicuruzwa bya HEMC ni eteri za cellulose zitari ionic kandi si polyelectrolytes, bityo bikaba bihamye mu bisubizo by'amazi iyo hari umunyu w'icyuma cyangwa electrolytes organic, ariko kongeramo electrolytes nyinshi bishobora gutera gellation no kugwa.

3. Imikorere y'ubuso: Bitewe n'imikorere y'ubuso bw'umuti w'amazi, ushobora gukoreshwa nk'ikintu kirinda kolloidal, emulsifier na dispersant.

4. Jeli y'ubushyuhe: Iyo umuti w'amazi w'ibicuruzwa bya HEMC ushyushye ku bushyuhe runaka, uba utagaragara, jeli, kandi urimo guhumeka, ariko iyo ukonjeshejwe buri gihe, ugaruka ku buryo bwawo bwa mbere, kandi ubushyuhe iyi jeli n'imvura bibaho ahanini bitewe n'amavuta, ibikoresho byo gufunga, colloids zo kurinda, emulsifiers nibindi.

5. Kudakora neza kw'imisemburo n'impumuro nke: HEMC ikoreshwa cyane mu biribwa no mu buvuzi kuko itazahindukamo imisemburo kandi ifite impumuro nke n'impumuro nke.

6. Kurwanya ifu y'umukungugu: HEMC ifite ubudahangarwa bwiza bw'ifu y'umukungugu kandi ikagira ubukana bwiza mu gihe kibitswe igihe kirekire.

7. Guhagarara neza kwa PH: Uburemere bw'amazi y'ibicuruzwa bya HEMC ntibugira ingaruka cyane kuri aside cyangwa alkali, kandi agaciro ka pH kari hagati ya 3.0 na 11.0.

Porogaramu

Hydroxyethyl methylcellulose ishobora gukoreshwa nk'ikintu kirinda kolloidal, emulsifier na dispersant bitewe n'imikorere yayo mu gisubizo cy'amazi. Ingero z'ikoreshwa ryayo ni izi zikurikira:

1. Ingaruka za hydroxyethyl methylcellulose ku mikorere ya sima. Hydroxyethyl methylcellulose ni ifu yera idahumura, idasembuye, kandi idahumanya ishobora gushonga mu mazi akonje kugira ngo ikore umuti ubonerana. Ifite imiterere yo gukomera, gufatanya, gukwirakwiza, gukurura, gukora filime, guhagarika, gukurura, gukora gel, kubungabunga ubushuhe no kurinda colloid. Kubera ko umuti w'amazi ufite imikorere ikora ku buso, ushobora gukoreshwa nk'umuti urinda colloid, emulsifier na dispersant. Umuti w'amazi wa Hydroxyethyl methylcellulose ufite ubushobozi bwo gufata amazi neza kandi ni umuti mwiza wo kubika amazi.

2. Hategurwa irangi ryoroshye cyane, rikorwa mu bikoresho fatizo bikurikira mu bice bitandukanye hakurikijwe uburemere: 150-200 g by'amazi yakuwemo ioni; 60-70 g by'umusemburo wa acrylic; 550-650 g by'umunyu wa kalisiyumu mwinshi; 70-90 g by'ifu ya talcum; Umuti w'amazi wa base cellulose 30-40g; umuti w'amazi wa lignocellulose 10-20g; ubufasha bwo gukora filime 4-6g; imiti yica udukoko n'imiti yica udukoko 1.5-2.5g; dispersant 1.8-2.2g; umuti wo kogosha 1.8-2.2g; 3.5-4.5g; Ethylene glycol 9-11g; Umuti w'amazi wa hydroxyethyl methylcellulose ukorwa mu gushonga 2-4% bya hydroxyethyl methylcellulose mu mazi; Umuti w'amazi wa lignocellulose ukorwa mu gushonga 1-3% bya Lignocellulose ukorwa mu gushonga mu mazi.

Imyiteguro

Uburyo bwo gutegura hydroxyethyl methyl cellulose, uburyo ni uko ipamba itunganyijwe ikoreshwa nk'ibikoresho fatizo, naho ethylene oxide igakoreshwa nk'ikintu gitanga etherification mu gutegura hydroxyethyl methyl cellulose. Ibice by'uburemere bw'ibikoresho fatizo byo gutegura hydroxyethyl methylcellulose ni ibi bikurikira: Ibice 700-800 bya toluene na isopropanol nk'umusemburo, Ibice 30-40 by'amazi, Ibice 70-80 bya sodium hydroxide, Ibice 80-85 by'ipamba itunganyijwe, impeta ibice 20-28 bya oxy ethane, Ibice 80-90 bya methyl chloride, Ibice 16-19 bya aside glacial acetic; intambwe zihariye ni izi:

Intambwe ya mbere, mu gikoresho cyo gukaraba, ongeramo uruvange rwa toluene na isopropanol, amazi, na sodiyumu hidroksidi, ushyushye kugeza kuri 60-80 ° C, ubibike mu gihe cy'iminota 20-40;

Intambwe ya kabiri, gukonjesha ibikoresho byavuzwe haruguru kugeza kuri 30-50°C, ongeramo ipamba itunganyijwe, usukemo toluene na isopropanol, uvange na vacuum kugeza kuri 0.006Mpa, wuzuze azote inshuro 3, hanyuma nyuma yo gusimbuza Alkaline, imiterere ya alkalize ni iyi: igihe cyo gukonjesha ni amasaha 2, naho ubushyuhe bwa alkalize ni 30°C kugeza 50°C;

Intambwe ya gatatu, etherification: nyuma yo kurangiza alkalize, reactor ijyanwa kuri 0.05-0.07MPa, hanyuma ethylene oxyde na methyl chloride byongerwaho mu minota 30-50; icyiciro cya mbere cya etherification: 40-60°C, amasaha 1.0-2.0, igitutu kigenzurwa hagati ya 0.15 na 0.3Mpa; icyiciro cya kabiri cya etherification: 60～90℃, amasaha 2.0～2.5, igitutu kigenzurwa hagati ya 0.4 na 0.8Mpa;

Intambwe ya kane, gutandukanya: ongeramo aside asetiki yapimwe mbere y’igihe mu gikoresho cyo kunyweramo amazi, kanda mu bikoresho bya etherized kugira ngo bivange amazi, shyira ubushyuhe kuri 75-80°C kugira ngo imvura ivure, ubushyuhe buzamuka bugere kuri 102°C, kandi pH igaragara ko ari 6. Saa munani, gutandukanya amazi biba birangiye; ikigega cyo kunyweramo amazi cyuzuye amazi ya robine yavuwe n’igikoresho gisubiza inyuma amazi ya osmosis kuri 90°C kugeza 100°C;

Intambwe ya gatanu, gukaraba hakoreshejwe centrifuge: ibikoresho biri mu ntambwe ya kane binyuzwa muri centrifuge ikoresheje screw screw itambitse, hanyuma ibikoresho byatandukanyijwe bishyirwa mu gikoresho cyo gukaraba cyuzuyemo amazi ashyushye mbere yo koza ibikoresho;

Intambwe ya gatandatu, ni ukumisha hakoreshejwe centrifuge: ibikoresho byogejwe bijyanwa mu cyuma cyumisha hakoreshejwe screw centrifuge itambitse, hanyuma ibikoresho bikamishwa kuri 150-170°C, hanyuma ibikoresho byumye bigasenywa bigapfunyikwa.

Ugereranije n'ikoranabuhanga risanzweho ryo gukora ether ya cellulose, ubu buvumbuzi bukoresha ethylene oxide nk'ikintu gifasha mu gutegura hydroxyethyl methyl cellulose, ifite ubushobozi bwo kurwanya mildew kubera ko irimo amatsinda ya hydroxyethyl. Ifite ubushobozi bwo kudahinduka no kurwanya mildew mu gihe kibitswe igihe kirekire. Ishobora gukoreshwa aho gukoresha izindi ether za cellulose.