Ndezvipi zvinokonzerwa nehukuru hwemunhuhwi pahydroxypropyl methylcellulose:
Kugadzirwa kwehydroxypropyl methylcellulose: Isa cellulose yedonje yakanatswa ne lye pa35-40°C kwehafu yeawa, dzvanya, pwanya cellulose, uye gadzira zvakanaka pa35°C, kuitira kuti avhareji yepolymerization yealkali yakawanikwa ive mukati mehuwandu hunodiwa mukati. Isa alkali fiber mukettle ye etherification, wedzera propylene oxide ne methyl chloride zvakatevedzana, uye etherify pa50-80°C kwemaawa mashanu, kumanikidzwa kukuru kunenge 1.8MPa. Wobva wawedzera huwandu hwakakodzera hwe hydrochloric acid ne oxalic acid mumvura inopisa pa90°C kuti usuke zvinhu kuti uwedzere vhoriyamu. Sungunusa mvura mu centrifuge. Geza nemvura kusvika yanyatsokwana. Kana hunyoro hwezvinhu hwadzikira pane 60%, huomese nemhepo inopisa pa130°C kusvika hunyoro hwadzikira pane 5%.
HPMC inogadzirwa nenzira yekunyungudutsa inoshandisa toluene neisopropanol sezvinhu zvinonyungudutsa. Kana kusukwa kusina kunaka, kunhuhwirira kushoma kucharamba kuripo. Parizvino, mhando yehydroxypropyl methylcellulose HPMC inosiyana zvikuru, uye mutengo unosiyana zvakanyanya, zvichiita kuti zviomere vatengi kusarudza zvakanaka. Iri ndiro dambudziko rekuwachisa, harikanganisi mashandisirwo uye hapana dambudziko, HPMC yakachena haifanirwe kunhuhwidza ammonia, starch nedoro;HPMCinogona kunhuhwirira mhando dzese dzemunhuwi, kunyangwe isina kunaka, inonzwika kunge inorema. Zvisinei, hydroxypropyl methylcellulose inogadzirwa nevagadziri vazhinji ine hwema hwakasimba uye hwema hunorwadza. Hunhu hwayo hahuna kunyatsonaka.
Hypromellose inowanikwa nekunyudza donje rakanatswa nemvura isingawanzo kuwanikwa kuti iwane alkaline cellulose, wobva wawedzera solvent, etherification agent, toluene, uye isopropanol ye etherification reaction, kudzima kusukwa, kuomesa, kupwanya, nezvimwewo kuti zvigadzirwa zvipedzwe. Zvakanaka, pachava nekunhuhwirira, saka vashandisi vanogona kuishandisa nechivimbo.
Nguva yekutumira: Kubvumbi-25-2024