Kedu ihe sitere na Hydroxypropyl Methylcellulose

Hydroxypropyl methylcellulose (HPMC) bụ polymer semisynthetic nke a na-eji n'ọtụtụ ụlọ ọrụ, gụnyere ihe owuwu, nri, ọgwụ, na ngwaahịa nlekọta onwe onye. A na-eji ya kpọrọ ihe maka ike ya iji melite rheological Njirimara nke formulations, nakwa dị ka ya ndakọrịta na ndị ọzọ Efrata na ya ala toxicity. Iji ghọta ka esi eme HPMC, ọ dị mkpa ibu ụzọ ghọta nhazi na njirimara nke cellulose.

Cellulose bụ ogologo yinye glucose ụmụ irighiri ihe dị na mgbidi cell nke osisi. A na-ejikọta mkpụrụ ndụ glucose ọnụ site na njikọ beta-1,4-glycosidic, na-eme agbụ ahịrị. A na-ejikọta ụdọ ndị ahụ site na njikọ hydrogen na ndị agha Van der Waals iji guzobe ihe owuwu siri ike. Cellulose bụ ihe ndị na-emepụta ihe na-emepụta ihe n'ụwa, a na-ejikwa ya n'ọtụtụ ngwa ngwa, gụnyere akwụkwọ, textiles, na ihe ụlọ.

Ọ bụ ezie na cellulose nwere ọtụtụ ihe bara uru, ọ na-esikarị ike ma na-esighi ike iji mee ihe n'ọtụtụ nhazi. Iji merie adịghị ike ndị a, ndị ọkà mmụta sayensị emepụtala ọtụtụ ihe mmepụta cellulose gbanwetụrụ, gụnyere HPMC. A na-eme HPMC site n'ịgbanwe cellulose eke site na usoro mmeghachi omume kemịkal.

Nzọụkwụ mbụ n'ime HPMC bụ inweta ihe mmalite cellulose. Enwere ike ime nke a site n'iwepụta cellulose site na isi ihe ọkụkụ dị ka pulp osisi, owu, ma ọ bụ achara. A na-ejikwa ihe ngwọta alkaline na-agwọ cellulose ahụ, dị ka sodium hydroxide ma ọ bụ potassium hydroxide, iji wepụ ihe ndị na-adịghị ọcha ma na-agbajikwa eriri cellulose n'ime ihe ndị dị nta. A maara usoro a dị ka mercerization, ọ na-eme ka cellulose na-emeghachi omume ma dị mfe ịgbanwe.

Mgbe mercerization gasịrị, cellulose na-emeghachi omume na ngwakọta nke propylene oxide na methyl chloride iji webata hydroxypropyl na methyl otu n'ime ọkpụkpụ azụ cellulose. A na-agbakwunye ìgwè hydroxypropyl iji meziwanye ihe ndị na-edozi ahụ na mmiri na-ejide mmiri nke cellulose, ebe a na-agbakwụnye ìgwè methyl iji mee ka nkwụsi ike dịkwuo elu ma belata mmeghachi omume nke cellulose. A na-eme mmeghachi omume ahụ n'ihu ihe na-akpali akpali, dị ka sodium hydroxide ma ọ bụ potassium hydroxide, yana n'okpuru ọnọdụ a na-achịkwa nke okpomọkụ, nrụgide, na oge mmeghachi omume.

Ogo nke nnọchi (DS) nke HPMC na-ezo aka ọnụ ọgụgụ nke hydroxypropyl na methyl otu nke ewebata n'ime ọkpụkpụ azụ cellulose. DS nwere ike ịdịgasị iche dabere na ihe achọrọ nke HPMC yana ngwa a kapịrị ọnụ a na-eji ya. Na mkpokọta, ụkpụrụ DS dị elu na-ebute HPMC nwere viscosity dị ala yana ọnụego mgbasa ngwa ngwa, ebe ụkpụrụ DS dị ala na-ebute HPMC nwere viscosity dị elu yana ọnụego mgbasa nwayọ nwayọ.

Mgbe mmeghachi omume ahụ mechara, ngwaahịa a na-esi na ya pụta dị ọcha ma kpoo ya iji mepụta ntụ ntụ HPMC. Usoro nchacha ahụ gụnyere iwepụ kemịkalụ ọ bụla na-emeghị eme, ihe mgbaze, na adịghị ọcha ndị ọzọ na HPMC. A na-emekarị nke a site na nchikota nke ịsa, nzacha, na ihicha usoro.

Ngwaahịa ikpeazụ bụ ọcha na-acha ọcha ntụ ntụ na-enweghị isi na enweghị ụtọ. HPMC bụ soluble na mmiri na ọtụtụ organic solvents, na ọ nwere ike na-etolite gels, ihe nkiri, na ndị ọzọ na-arụ ọrụ dabere na ọnọdụ nke ojiji. Ọ bụ polymer na-abụghị ionic, nke pụtara na ọ naghị ebu ọkụ eletrik ọ bụla, a na-ewerekwa ya dị ka ihe na-adịghị egbu egbu ma dị mma maka iji ya mee ihe n'ọtụtụ ngwa.

A na-eji HPMC n'ụdị ụdị dị iche iche, gụnyere agba, nrapado, mkpuchi, ọgwụ, na ngwaahịa nri. N'ime ngwa ihe owuwu, a na-ejikarị HPMC eme ihe dị ka ihe nkpuchi, ihe nkedo, na onye na-eme ihe nkiri na ngwaahịa cimentious na gypsum, dị ka ngwa agha, grouts, na ogige nkwonkwo.