Lekwasị anya na cellulose ethers

Kedu ka HPMC si abawanye viscosity nke nrapado?

Iji ghọta otú Hydroxypropyl Methylcellulose (HPMC) si eme ka viscosity nke adhesives dịkwuo elu, anyị kwesịrị ịbanye n'ime usoro ihe omimi ya, mmekọrịta dị n'ime usoro nrapado, na mmetụta ọ na-enwe na nrapado.

Okwu mmalite nke HPMC:

HPMC bụ ihe mwepụta nke cellulose, polymer na-emekarị n'ime osisi. A na-eji ya eme ihe n'ọtụtụ ụlọ ọrụ dị iche iche, gụnyere ọgwụ, ihe owuwu, na adhesives, n'ihi njirimara ya pụrụ iche. Na adhesives, HPMC na-arụ ọtụtụ ọrụ, gụnyere ịgbakọ, njigide mmiri, na imeziwanye nrapado.

Ọdịdị Molecular:

Ọdịdị molekụla nke HPMC nwere ọkpụkpụ azụ cellulose yana otu methyl na hydroxypropyl jikọtara ya. Agbụ akụkụ ndị a na-enye aka na solubility ya na mmekọrịta ya na ụmụ irighiri ihe ndị ọzọ na nhazi nrapado. Ogo nke nnọchi (DS) nke ụdọ akụkụ ndị a na-emetụta akụrụngwa HPMC, gụnyere solubility, viscosity, na ike nhazi gel.

Mechanism na-eme ka ọ dị arọ:

HPMC na-eme ka adhesives na-ebuwanye ibu site n'ikike ya ịmepụta njikọ hydrogen na imekọ ihe na ụmụ irighiri mmiri. Mgbe HPMC na-agbasasị na mmiri ma ọ bụ ihe mgbaze, hydroxypropyl na hydroxyl dị iche iche na agbụ ya na-etolite njikọ hydrogen na ụmụ irighiri mmiri, na-emepụta netwọk nwere akụkụ atọ. Netwọk a na-ejide ụmụ irighiri ihe mgbaze, na-abawanye viscosity nke ngwọta.

Mmekọrịta polymer-solvent:

N'ụdị nrapado, HPMC na-ejikọta ma ihe mgbaze na ihe nrapado ndị ọzọ. Ọdịdị hydrophilic nke HPMC na-enye ya ohere ịmịnye ma na-ejigide mmiri site na nhazi ahụ, na-egbochi nrapado site na ihicha ngwa ngwa. Ike njide mmiri a na-enyere aka ịnọgide na-arụ ọrụ nke nrapado na oge oghere.

Mmekọrịta ya na ngwa nrapado ndị ọzọ:

HPMC na-emekọrịta ihe na ihe nrapado ndị ọzọ, dị ka polymers, fillers, na tackifiers. Ọ nwere ike ịmepụta njikọ anụ ahụ ma ọ bụ njikọ hydrogen na ihe ndị a, na-eduga n'ịbawanye viscosity na mma rheological Njirimara. Na mgbakwunye, HPMC nwere ike rụọ ọrụ dị ka ihe nkedo, na-eme ka njikọ nke nrapado dịkwuo elu.

Mmetụta na Njirimara Nrapado:

Mgbakwunye nke HPMC na-emetụta ihe dị iche iche nke nrapado, gụnyere viscosity, ike shiee, tackiness, na ịtọ oge. Site n'ịbawanye viscosity, HPMC na-eme ka nguzogide sag nke ngwa kwụ ọtọ, na-egbochi ntinye nrapado n'oge mgbakọ, ma na-akwalite mkpuchi na ihe ndị nwere porous. Ọzọkwa, HPMC na-enye aka na ike njikọta nke nrapado, na-eduga n'ịrụ ọrụ nkekọ ka mma.

Atụmatụ nhazi:

Mgbe ị na-emepụta adhesives na HPMC, a ga-atụle ọtụtụ ihe, gụnyere oke viscosity achọrọ, usoro ngwa, ndakọrịta mkpụrụ, na ọnọdụ gburugburu ebe obibi. Nhọrọ nke ọkwa HPMC, DS, na itinye uche kwesịrị ka emeziwanye ya iji nweta arụmọrụ nrapado achọrọ ka ọ na-ahụ na ndakọrịta na ngwa nhazi ndị ọzọ.

Hydroxypropyl Methylcellulose (HPMC) bụ ihe mgbakwunye dị iche iche na-arụ ọrụ dị mkpa n'ịbawanye viscosity nke adhesives. Site na usoro ihe omuma ya, mmekorita ya na ihe mgbaze na ihe ndi ozo, na-enwe mmetụta na ihe nrapado, HPMC na-enye aka n'ozuzu oru na ngwa nke adhesives na ulo oru di iche iche.

Itinye HPMC n'ime usoro nrapado chọrọ nleba anya nke ọma maka njirimara ya na mmekọrịta ya iji nweta njirimara reological na nrapado chọrọ. Dị ka isi ihe na-eme ka ihe na-emekọ ihe na rheology modifier, HPMC na-akwalite arụmọrụ nrapado, na-eme ka njikọ na ngwa kachasị mma gafee ụdị na ọnọdụ dị iche iche.


Oge nzipu: Mee-08-2024
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