Hydroxypropylmethylcellulose (HPMC) waa soosaar cellulose ah oo si ballaaran looga isticmaalo warshado kala duwan.Isticmaalka ugu muhiimsan ee HPMC waa sida dhumucyada, xasiliyayaasha iyo emulsifiers ee cuntada, dawooyinka iyo warshadaha qurxinta.HPMC waxa kale oo loo isticmaalaa qaybta dhismaha sida wax lagu daro sibidhka, sida dahaarka kiniiniyada iyo kaabsalka, iyo sida xalka indhaha.Qalabka ugu muhiimsan ee ceyriinka HPMC waa cellulose iyo reagents kiimikaad.
Cellulose:
Cellulose waa sheyga ugu muhiimsan ee wax soo saarka HPMC.Cellulose waa polymer dabiici ah oo laga helo gidaarada unugyada dhirta waana polymerka ugu badan ee dabiiciga ah ee Dhulka.Sifooyinka kiimikaad ee cellulose waxay la mid yihiin HPMC, taas oo ka dhigaysa alaabta ceeriin ee ugu habboon soo saarista HPMC.Cellulose waxaa laga soo qaatay ilo kala duwan, oo ay ku jiraan alwaax, suuf, iyo dhir kala duwan.
Ilaha ugu badan ee cellulose ee loo isticmaalo soosaarka HPMC waa saxarka alwaax.Saxarka alwaaxa waxaa laga soo qaatay alwaax jilicsan sida spruce, geed iyo fir.Saxarka alwaax waxaa lagu daaweeyaa kiimiko si loo burburiyo lignin iyo hemicellulose, taasoo ka tagaysa cellulose saafi ah.cellulose-ka saafiga ah ayaa markaa la nadiifiyaa oo la dhaqaa si looga saaro wixii wasakh ah.
Cellulose loo isticmaalo soo saarista HPMC waa in ay ahaataa mid tayadeedu sareyso waana in la raaco tilaabooyin lagu xakameynayo tayada adag si loo hubiyo nadiifnimada cellulose.Nadiifinta cellulose waa muhiim sababtoo ah wasakhdu waxay saameyn kartaa sifooyinka alaabta ugu dambeysa.
Kiimikada reageyaasha:
Soo saarista HPMC waxay u baahan tahay isticmaalka reagents kiimikaad oo kala duwan.Kiimikada loo isticmaalo soo saarista HPMC waxaa ka mid ah propylene oxide, methyl chloride, sodium hydroxide, hydrochloric acid, iwm.
Propylene oxide waxaa loo isticmaalaa in lagu soo saaro hydroxypropyl cellulose (HPC), kaas oo markaas lagu falceliyo methyl chloride si loo soo saaro HPMC.HPC waxay la falgashaa methyl chloride si ay ugu bedesho qaar ka mid ah kooxaha hydroxyl ee silsiladda cellulose-ka methoxy iyo kooxaha hydroxypropyl, si ay u abuurto HPMC.
Sodium hydroxide waxaa loo isticmaalaa soo saarista HPMC si loo kordhiyo qiimaha pH ee xalka falcelinta si uu u caawiyo milanka cellulose.
Inta lagu jiro habka wax soo saarka HPMC, hydrochloric acid waxaa loo isticmaalaa in lagu hagaajiyo qiimaha pH ee xalka falcelinta.
Kiimikada loo isticmaalo soo saarista HPMC waa inay ahaadaan nadiif sare, xaaladaha falcelinta waa in si taxadar leh loo xakameeyaa si loo hubiyo tayada badeecada ugu dambeysa.
Gabagabadii:
Qalabka ugu muhiimsan ee ceyriinka HPMC waa cellulose iyo reagents kiimikaad.Cellulose, oo laga soo qaatay ilo kala duwan oo ay ku jiraan alwaax, suuf, iyo dhir kala duwan, waa alaabta ceeriin ee aasaasiga ah ee wax soo saarka HPMC.Kiimikada loo isticmaalo soosaarka HPMC waxaa ka mid ah propylene oxide, methyl chloride, sodium hydroxide iyo hydrochloric acid.Wax soo saarka HPMC wuxuu u baahan yahay tallaabooyin adag oo lagu xakameynayo tayada si loo hubiyo nadiifnimada alaabta ceeriin iyo tayada alaabta ugu dambeysa.HPMC waxaa si weyn looga isticmaalaa warshado kala duwan waxayna leedahay codsiyo kala duwan iyadoo ay ugu wacan tahay sifooyinkeeda gaarka ah.
Waqtiga boostada: Sebtembar-06-2023