Hydroxypropyl methyl cellulose HPMC, izwi kandi nka hydroxypromellose, ni ifu ya eteri ya selulosi y'umweru cyangwa umweru ifite ubushobozi bwo gushonga mu mazi akonje no kudashonga mu mazi ashyushye nk'uko bimeze kuri selulosi ya methyl. Itsinda rya Hydroxypropyl n'itsinda rya methyl ni eteri ifatanya na filime ya glucose ya anhydrous ya selulosi, ni ubwoko bwa eteri ivanze ya selulosi itari ionic. Ni polymeri ya viscoelastic ikoreshwa nk'amavuta mu buvuzi bw'amaso, cyangwa nk'umusemburo cyangwa umusemburo mu miti inywa.
1. Uburyo bwo gukora
Ifu y’umusemburo ifite αcellulose 97%, ubushyuhe bw’imbere bwa 720mL /g n’uburebure bw’imyobo ya 2.6mm yashyizwe mu gisubizo cya 49% cya NaOH kuri 40°C mu gihe cy’amasegonda 50. Hanyuma ifu y’umusemburo yakuwemo kugira ngo ikuremo igisubizo cya 49% cya NaOH kugira ngo haboneke selulose ya alkali. Igipimo cy’uburemere bwa (49% NaOH aqueous solution) kuri (igice gikomeye cya pulp) mu ntambwe yo guteranya cyari 200. Igipimo cy’uburemere bwa NaOH muri selulose ya alkali ku kintu gikomeye muri pulp ni 1.49. Selulose ya alkali yabonetse (20kg) ishyirwa mu cyuma gishyushya umwuka gifite imbaraga zo guhumeka imbere, hanyuma ivamo umwuka hanyuma isukurwa na azote kugira ngo ikure ogisijeni mu cyuma gishyushya imbere. Hanyuma, ubushyuhe muri rupture bwagenzuwe kuri 60°C mu gihe hakorwaga gukurura imbere.
Hanyuma hongeweho 2.4kg dME maze ubushyuhe muri reactor bugenzurwa kugeza kuri dogere 60°C. Nyuma yo kongeramo dimethyl ether, methylene chloride yongeweho kugira ngo hakorwe molar ratio ya methylene chloride na NaOH muri alkaline cellulose 1.3, propylene oxide yongeweho kugira ngo hakorwe uburemere bwa propylene oxide n'ibikomeye muri pulp 1.97, naho ubushyuhe muri reactor bugenzurwa kuva kuri dogere 60°C kugeza kuri dogere 80°C. Nyuma yo kongeramo chloromethane na propylene oxide, ubushyuhe muri reactor bwagenzuwe kuva kuri dogere 80°C kugeza kuri dogere 90°C. Byongeye kandi, reaction yamaze iminota 20 kuri dogere 90°C.
Hanyuma umwuka uva muri reactor hanyuma cellulose ya hydroxypropyl methyl ikurwa muri reactor. Ubushyuhe bwa cellulose ya hydroxypropyl methyl idafite ubushyuhe bwari 62°C. Pima ingano ya 50% y’uduce mu ngano y’uduce dushingiye ku buremere bw’uduce dushingiye ku gipimo cya cellulose ya hydroxypropyl methyl idafite ubushyuhe unyuze mu myobo y’uduce dutanu, buri kimwe gifite ingano itandukanye y’imyobo.
Kubera iyo mpamvu, ingano mpuzandengo y'uduce duto tw'uduce duto yari 6.2mm. Cellulose ya hydroxypropyl methyl cellulose yabonetse yashyizwe mu cyuma gikomeza gukanika (KRC kneader S1, L/D = 10.2, ingano y'imbere 0.12 L, umuvuduko wo kuzenguruka 150rpm) ku muvuduko wa 10kg/isaha, maze haboneka selulose ya hydroxypropyl methyl cellulose yangiritse. Kubera ibipimo bisa hakoreshejwe ibyuma 5 bifite ingano zitandukanye zo gufungura, ingano mpuzandengo y'uduce yari 1.4mm. Hongewemo amazi ashyushye ya 80℃ kuri selulose ya hydroxypropyl methyl cellulose yangiritse mu mvange hamwe n'ubushyuhe bw'ikoti. Ingano y'uburemere bwa selulose ya hydroxypropyl methyl yangiritse ku gipimo cyose cya selulose ni 0.1, hanyuma selulose iraboneka. Selulose yavunguwe ku bushyuhe budahinduka bwa 80℃ mu gihe cy'iminota 60.
Hanyuma, urusenda rutangwa ku muvuduko uzenguruka wa 0.5 RPM na filter izunguruka ishyushye cyane (BIDUFITE BHS Sonthofen). Ubushyuhe bwa grout ni 93°C. Koresha pompe kugira ngo utange urusenda, umuvuduko wo gusohora pompe ni 0.2MPa. Ingano y'ifungura ry'urusenda ruzunguruka ni 80μm, naho agace k'urusenda ni 0.12m2. Urusenda rutangwa kuri filter izunguruka runyuzwa muri filter hanyuma ruhinduka filter keke. Urusenda ruvuyemo rutangwa n'umwuka wa 0.3MPa n'amazi ashyushye ya 95°C hamwe n'uburemere bwa 10.0 ku gice gikomeye cya HYDROXYpropyl methyl cellulose yogejwe, hanyuma inyuzwa muri filter.
Amazi ashyushye atangwa binyuze mu ipompe ku gitutu cya 0.2mpa. Nyuma yo gutanga amazi ashyushye, hatangwa umwuka wa 0.3mpa. Hanyuma, nyuma yo gukaraba ibintu bikurwa ku mashini iyungurura hakoreshejwe icyuma gikaraba hanyuma bigasohoka mu mashini imesa. Intambwe kuva ku gutanga ubushyuhe kugeza ku gusohora ibintu bisukuye bikorwa buri gihe. Nk’uko bipimwe hakoreshejwe hygrometer ishyushya, amazi y’ibicuruzwa bisukuye yari 52.8%. Ibicuruzwa bisukuye biva mu mashini yumisha umwuka ku bushyuhe bwa 80°C, hanyuma bigasyirwa mu ruganda rwa Victory kugira ngo haboneke hydroxypropyl methyl cellulose.
2. Gukoresha
HPMCIyi mashini ikoreshwa mu gukurura, gukwirakwiza, gufunga, gusya no gushimangira mu nganda z'imyenda. Ikoreshwa kandi cyane mu nganda zikora ubutare, peteroli, iseramike, impapuro, uruhu, imiti, ibiribwa, amavuta yo kwisiga n'izindi nganda.
Igihe cyo kohereza: 26 Mata 2024