Hydroxypropyl methyl selulose HPMC, izwi kandi nka hydroxypromellose, ni ifu yera ya selulose ya ether ifu cyangwa granule ifite amazi akonje hamwe nubushyuhe bwamazi ashyushye asa na methyl selile.Itsinda rya Hydroxypropyl hamwe na methyl ni ether ihuza hamwe na glucose ya anhydrous glucose ya selile ihujwe, ni ubwoko bwa selile idafite ionic ivanze na ether.Nibice bya sintetike, idakora, viscoelastic polymer ikunze gukoreshwa nkamavuta yo kuvura amaso, cyangwa nkibintu byoroshye cyangwa byoroshye mumiti yo munwa.
1. Uburyo bwo kubyaza umusaruro
Ubukorikori bukora hamwe na αcellulose irimo 97%, ubwiza bwimbere bwa 720mL / g hamwe nuburebure bwa fibre burebure bwa 2,6mm byashizwe mumuti wa 49% NaOH kuri 40 ℃ kumasegonda 50.Noneho ifu yakuweho kugirango ikureho 49% ya NaOH igisubizo kugirango ubone alkali selile.Ikigereranyo cyibiro bya (49% NaOH yumuti wamazi) na (ibice bikomeye bya pulp) murwego rwo gutera akabariro byari 200. Ikigereranyo cyibiro bya NaOH muri selile ya alkali na selile ikomeye ni 1.49.Alkali selulose yabonetse (20kg) ishyirwa mumashanyarazi yumuvuduko ukabije hamwe nuguhagarika umutima, hanyuma ugahumeka hanyuma ugasukurwa na azote kugirango ukureho ogisijeni ihagije kuri reaction.Hanyuma, ubushyuhe muri reaction bwagenzuwe kuri 60 ℃ mugihe gukurura imbere byakozwe.
Hanyuma hiyongereyeho 2,4 kg dME hanyuma ubushyuhe muri reaktor bugenzurwa kugeza 60 ℃.Nyuma yo kongeramo dimethyl ether, hiyongereyeho methylene chloride kugirango igabanye umubyimba wa methylene chloride na NaOH muri selile ya alkaline 1.3, oxyde ya propylene yongewemo kugirango igipimo cy’uburemere bwa oxyde ya propylene gikomere kuri pulp 1.97, n'ubushyuhe muri reaktor. yagenzuwe kuva 60 ℃ kugeza 80 ℃.Nyuma yo kongeramo chloromethane na okiside ya propylene, ubushyuhe muri reaktor bwagenzuwe kuva 80 ℃ kugeza 90 ℃.Mubyongeyeho, reaction yamaze iminota 20 kuri 90 ℃.
Gazi ihita ikurwa mumashanyarazi hanyuma hydroxypropyl methyl selulose ikavanwa mumashanyarazi.Ubushyuhe bwa hydroxypropyl methyl selulose yari 62 ℃.Gupima ubunini bwa 50% mubunini bwa cumulative yuburemere bushingiye ku kugabana ingano ukurikije igipimo cya hydroxypropyl methyl selulose ya peteroli ikoresheje gufungura ibice bitanu, buri kimwe gifite ubunini butandukanye bwo gufungura.
Nkigisubizo, impuzandengo yikigereranyo cyibice bito byari 6.2mm.Hydroxypropyl methyl selulose yabonetse yinjijwe mumashanyarazi ikomeza ya biaxial (KRC knader S1, L / D = 10.2, ingano y'imbere 0,12 L, umuvuduko wo kuzunguruka 150rpm) ku muvuduko wa 10kg / hr, kandi habonetse hydroxypropyl methyl selulose.Nkibisubizo byibipimo bisa ukoresheje ecran 5 nubunini butandukanye bwo gufungura, impuzandengo yikigereranyo yari 1.4mm.Ongeramo 80 water amazi ashyushye kuri hydroxypropyl methyl selulose yangiritse muri tank hamwe no kugenzura ubushyuhe bwikoti.ingano yuburemere bwibipimo bya hydroxypropyl methyl selulose yangirika kugeza ku mubare wuzuye wa 0.1 ni 0.1, kandi haboneka ibishishwa.Igishishwa cyashushe ku bushyuhe buhoraho bwa 80 ℃ mu minota 60.
Noneho, slurry itangwa kumuvuduko wo kuzunguruka wa 0.5 RPM hamwe nubushyuhe bwo kuzunguruka mbere yo gushungura (ibicuruzwa BHS Sonthofen).Ubushyuhe bwa grout ni 93 ℃.Koresha pompe kugirango utange ibicucu, umuvuduko wo gusohora pompe ni 0.2mpa.Ingano yo gufungura ya rotorisiyo yumuvuduko ni 80μm, naho akayunguruzo ni 0.12m2.Amashanyarazi yatanzwe kumuzunguruko wumuyunguruzo uyungurura unyuze muyungurura hanyuma uhindurwe mugace kayunguruzo.Agatsima kayunguruzo kavamo gahabwa 0.3mpa hamwe na 95 water amazi ashyushye hamwe nuburemere bwa 10.0 hamwe nikintu gikomeye cya HYDROXYpropyl methyl selulose yogejwe, hanyuma ikayungurura ikayungurura.
Amazi ashyushye atangwa binyuze muri pompe kumuvuduko wa 0.2mpa.Amazi ashyushye amaze gutangwa, 0.3mpa itangwa.Noneho, nyuma yo gukaraba ibicuruzwa bivanwa hejuru yayunguruzo na scraper hanyuma bigasohoka mumashini imesa.Intambwe zo gutanga ibicuruzwa kugeza gusohora ibicuruzwa byogejwe bikorwa ubudahwema.Nkuko bipimye ukoresheje ubushyuhe - yumisha hygrometero, amazi yibicuruzwa byogejwe bityo yasohotse ni 52.8%.Ibicuruzwa byogejwe bisohoka muyungurura umuvuduko ukabije byumye byumye byumuyaga kuri 80 and, hanyuma bijanjagurwa mu ruganda rwa Victory kugirango ubone hydroxypropyl methyl selulose.
2.Agusaba
Ibicuruzwa bya HPMC bikoreshwa nkibyimbye, bikwirakwiza, binder, emulifier na stabilisateur mu nganda z’imyenda.Ikoreshwa cyane muri resinike yubukorikori, peteroli-chimique, ceramic, impapuro, uruhu, ubuvuzi, ibiryo, amavuta yo kwisiga nizindi nganda.
Igihe cyo kohereza: Werurwe-23-2022