Hydroxypropyl methyl cellulose HPMC, nke a makwaara dị ka hydroxypromellose, bụ ntụ ntụ ether cellulose ọcha site na ọcha ruo na ọcha nke nwere mmiri oyi na-agbaze na mmiri ọkụ na-enweghị ike ịgbaze dị ka methyl cellulose. Otu Hydroxypropyl na otu methyl bụ njikọ ether na mgbanaka glucose anhydrous nke cellulose jikọtara ọnụ, bụ ụdị ether agwakọtara na-abụghị ionic. Ọ bụ polima semi-synthetic, nke na-adịghị arụ ọrụ, viscoelastic nke a na-ejikarị eme ihe dị ka mmanụ na ọgwụgwọ anya, ma ọ bụ dị ka ihe na-enye aka ma ọ bụ ihe na-enye aka na ọgwụ ọnụ.
1. Usoro mmepụta
A mikpuo mkpụrụ osisi Kraft nwere ọdịnaya αcellulose nke 97%, viscosity dị n'ime ya nke 720mL /g na nkezi ogologo eriri nke 2.6mm na mmiri NaOH nke 49% na 40℃ maka sekọnd 50. Mgbe ahụ, a na-ewepụta mkpụrụ osisi ahụ iji wepụ ihe ngwọta NaOH nke karịrị 49% iji nweta cellulose alkali. Oke ibu nke (mmiri mmiri NaOH nke 49%) na (ihe siri ike nke mkpụrụ osisi pulp) na usoro impregnation bụ 200. Oke ibu nke NaOH na alkali cellulose na ihe siri ike na mkpụrụ osisi pulp bụ 1.49. A na-etinye alkali cellulose nke e si otú a nweta (20kg) na reactor nrụgide jacked na mkpali dị n'ime, wee kpoo ya ma jiri nitrogen sachaa ya iji wepụ oxygen nke ọma na reactor ahụ. Mgbe ahụ, a na-achịkwa okpomọkụ dị na reactor na 60℃ ka a na-eme mkpali dị n'ime.
Mgbe ahụ, etinyere 2.4kg dME ma chịkwaa okpomọkụ dị na reactor ahụ ruo 60℃. Mgbe etinyere dimethyl ether, etinyere methylene chloride iji mee ka oke molar nke methylene chloride na NaOH dị na alkaline cellulose 1.3, etinyere propylene oxide iji mee ka oke ibu nke propylene oxide sie ike na pulp 1.97, a chịkwaa okpomọkụ dị na reactor ahụ site na 60℃ ruo 80℃. Mgbe etinyere chloromethane na propylene oxide, a chịkwaa okpomọkụ dị na reactor ahụ site na 80℃ ruo 90℃. Na mgbakwunye, mmeghachi omume ahụ dịruru nkeji iri abụọ na 90℃.
A na-ewepụ gas ahụ na reactor ahụ ma wepụ hydroxypropyl methyl cellulose dị nro na reactor ahụ. Okpomọkụ nke hydroxypropyl methyl cellulose dị nro bụ 62℃. Tụọ nha 50% nke ngụkọta na nkesa nha nha nke hydroxypropyl methyl cellulose dị nro dabere na oke nke hydroxypropyl methyl cellulose dị nro site na oghere nke sieve ise ahụ, nke ọ bụla nwere nha oghere dị iche.
N'ihi ya, nkezi nha nke ihe ndị dị nro bụ 6.2mm. E tinyere hydroxypropyl methyl cellulose dị nro nke enwetara n'ime ihe na-eme ka ọ dị nro (KRC kneader S1, L/D = 10.2, olu dị n'ime 0.12 L, ọsọ ntụgharị 150rpm) na ọsọ nke 10kg/hr, e wee nweta hydroxypropyl methyl cellulose dị nro nke gbawara agbawa. N'ihi nha ndị yiri ya site na iji ihuenyo ise nwere nha oghere dị iche iche, nkezi nha nke ihe ndị ahụ bụ 1.4mm. Na-agbakwunye mmiri ọkụ 80℃ na hydroxypropyl methyl cellulose dị nro nke gbawara agbawa n'ime tankị ahụ yana njikwa okpomọkụ nke jaket ahụ. oke nha nke hydroxypropyl methyl cellulose dị nro nke gbawara agbawa na mkpokọta nke ihe ndị ahụ bụ 0.1, a na-enwetakwa ihe ndị ahụ. A na-akpali slurry ahụ na okpomọkụ na-adịgide adịgide nke 80℃ maka nkeji 60.
Mgbe ahụ, a na-enye slurry ahụ ọsọ ntụgharị nke 0.5 RPM na ihe nzacha nrụgide rotary nke a na-ekpo ọkụ (ngwaahịa BHS Sonthofen). Okpomọkụ nke grout bụ 93℃. Jiri ọkpọkọ nye slurry, nrụgide mwepụta mgbapụta bụ 0.2mpa. Nha oghere nke ihe nzacha nrụgide rotary bụ 80μm, ebe nzacha ahụ bụ 0.12m2. A na-enyocha slurry enyere na nzacha nrụgide rotary site na nzacha ahụ ma gbanwee ya ka ọ bụrụ achịcha nzacha. A na-enye achịcha nzacha ahụ sitere na steam 0.3mpa na mmiri ọkụ 95℃ yana oke ibu nke 10.0 na akụkụ siri ike nke HYDROXYpropyl methyl cellulose a sachara, nke a na-emecha na nzacha.
A na-enye mmiri ọkụ site na ọkpọkọ na nrụgide mwepụ nke 0.2mpa. Mgbe e nyesịrị mmiri ọkụ, a na-enye uzuoku 0.3mpa. Mgbe e sachara, a na-ewepụ ihe ndị e ji kpụọ ihe n'elu nzacha ahụ site na iji ihe e ji akpụcha ihe ma na-ewepụ ha n'ime igwe ịsa ákwà. A na-eme usoro site n'inye ihe ruru unyi ruo na mwepụ nke ihe ndị e ji asa ákwà mgbe niile. Dịka a tụrụ ya site na iji hygrometer na-akpọ nkụ, mmiri dị n'ime ihe e ji asa ákwà ahụ a na-asacha bụ 52.8%. A na-eji igwe nkụ ikuku kpọọ ngwaahịa ndị e ji ihe nzacha nrụgide rotary mee nkụ na okpomọkụ 80℃, ma ghee ha n'ime igwe Victory iji nweta hydroxypropyl methyl cellulose.
2. Ngwa
HPMCA na-eji ngwaahịa a eme ihe dị ka ihe na-eme ka ihe sie ike, ihe na-agbasa, ihe na-ejikọta ihe, ihe na-eme ka ihe sie ike na ihe na-eme ka ọ sie ike n'ụlọ ọrụ ákwà. A na-ejikwa ya eme ihe n'ọtụtụ ebe na resin sịntetik, petrochemical, seramiiki, akwụkwọ, akpụkpọ anụ, ọgwụ, nri, ihe ịchọ mma na ụlọ ọrụ ndị ọzọ.
Oge ozi: Eprel-26-2024