Cellulose bụ polymer eke kachasị ukwuu na okike. Ọ bụ ngwakọta polymer linear jikọtara ya na D-glucose site na β-(1-4) glycosidic bonds. Ogo nke polymerization nke cellulose nwere ike iru 18,000, na molekụla arọ nwere ike iru ọtụtụ nde.
Enwere ike ịmepụta cellulose site na osisi pulp ma ọ bụ owu, nke n'onwe ya na-adịghị soluble na mmiri, ma ọ na-ewusi ya ike na alkali, etherified na methylene chloride na propylene oxide, na-asa na mmiri, na nke a mịrị amị iji nweta mmiri-soluble methyl cellulose (MC) na. hydroxypropyl methylcellulose (HPMC), ya bụ, methoxy na hydroxypropoxy na-eji dochie hydroxyl otu na C2, C3 na C6 ọnọdụ nke glucose na-etolite nonionic cellulose ethers.
Methyl cellulose bụ ntụ ntụ na-enweghị isi, na-acha ọcha na-acha ọcha na-acha ọcha n'ọdịdị, pH nke ngwọta dị n'etiti 5-8.
Ọdịnaya metoxyl nke methylcellulose a na-eji dị ka mgbakwunye nri na-abụkarị n'etiti 25% na 33%, ogo ngbanwe kwekọrọ na ya bụ 17-2.2, ogo usoro nnọchi anya dị n'etiti 0-3.
Dị ka ihe mgbakwunye nri, ọdịnaya metxyl nke hydroxypropyl methylcellulose na-adịkarị n'etiti 19% na 30%, na ọdịnaya hydroxypropoxyl na-adịkarị n'etiti 3% na 12%.
Njirimara nhazi
gel na-agbanwe agbanwe
Methylcellulose/Hydroxypropylmethylcellulose nwere mmetụta gelling na-agbanwe agbanwe.
Methyl cellulose/hydroxypropyl methyl cellulose ga-agbaze na mmiri oyi ma ọ bụ mmiri okpomọkụ nkịtị. Mgbe ngwọta mmiri na-ekpo ọkụ, viscosity ga-anọgide na-ebelata, na gelation ga-eme mgbe ọ ruru ụfọdụ okpomọkụ. N'oge a, methyl cellulose/hydroxypropyl methyl cellulose Ngwọta transperent nke propyl methylcellulose malitere ghọọ opaque milky white, na viscosity pụtara ìhè mụbara ngwa ngwa.
A na-akpọ ọnọdụ okpomọkụ a okpomọkụ mmalite gel thermal. Ka gel na-ajụ oyi, viscosity pụtara ìhè na-ada ngwa ngwa. N'ikpeazụ, eriri viscosity mgbe ọ dị jụụ na-adaba na mgbanaka viscosity nke mbụ na-ekpo ọkụ, gel na-atụgharị na ngwọta, ngwọta ahụ na-aghọ gel mgbe ọ na-ekpo ọkụ, na usoro nke ịtụgharị azụ n'ime ihe ngwọta mgbe jụrụ oyi na-atụgharị ma na-emegharị ya.
Hydroxypropyl methylcellulose nwere ogo mmalite mmalite nke thermal ka methylcellulose na ike gel dị ala.
Parụmọrụ
1. Ihe na-emepụta ihe nkiri
Ihe nkiri nke methylcellulose/hydroxypropylmethylcellulose mebere ma ọ bụ ihe nkiri nwere ha abụọ nwere ike igbochi ịkwaga mmanụ na mfu mmiri nke ọma, si otú a na-ahụ nkwụsi ike nke nhazi nri.
2. Emulsifying Njirimara
Methylcellulose/Hydroxypropylmethylcellulose nwere ike ibelata esemokwu elu ma belata mkpokọta abụba maka nkwụsi ike emulsion ka mma.
3. Njikwa ọnwụ mmiri
Methylcellulose/Hydroxypropylmethylcellulose nwere ike ịchịkwa mbugharị mmiri nke nri site na oyi na-atụ na okpomọkụ nkịtị, ma nwee ike ibelata mmebi, kristal ice na mgbanwe udidi nke nri sitere na refrigeration.
4. Nrapado arụmọrụ
A na-eji Methylcellulose/Hydroxypropylmethylcellulose mee ihe n'ụzọ dị irè iji zụlite ike njikọ kacha mma ma na-ejigide mmiri na njikwa ntọhapụ ụtọ.
5. Ọrụ hydration na-egbu oge
Ojiji nke methylcellulose/hydroxypropylmethylcellulose nwere ike ibelata viscosity nke nri n'oge nhazi okpomọkụ, si otú ahụ na-eme ka nrụpụta nrụpụta dị elu nke ukwuu. Na-ebelata ikpo ọkụ na akụrụngwa, na-eme ka oge usoro usoro na-eme ngwa ngwa, na-eme ka ọkụ ọkụ dịkwuo mma, na-ebelata nhazi nkwụnye ego.
6. Ịrụ ọrụ siri ike
Enwere ike iji Methylcellulose/Hydroxypropylmethylcellulose jikọtara ya na starch iji mepụta mmetụta synergistic, nke nwere ike ịbawanye viscosity nke ukwuu ọbụlagodi na ọkwa mgbakwunye dị ala.
7. Ngwọta ahụ kwụsiri ike n'okpuru ọnọdụ acidic na mmanya
Ihe ngwọta Methylcellulose/Hydroxypropylmethylcellulose kwụsiri ike ruo pH 3 ma nwee nkwụsi ike dị mma na ngwọta nwere mmanya.
Ngwa nke methyl cellulose na nri
Methyl cellulose bụ ụdị ether cellulose na-abụghị ionic nke a na-etolite site na iji cellulose eke dị ka akụrụngwa ma dochie otu hydroxyl na nkeji glucose anhydrous na cellulose na otu methoxy. Ọ nwere njigide mmiri, ịgbara mmiri, emulsification, nhazi ihe nkiri, nhazi nke oke pH na ọrụ elu na ọrụ ndị ọzọ.
Ihe kachasị emetụ n'ahụ ya bụ gelation thermally reversible, ya bụ, ngwọta mmiri ya na-etolite gel mgbe ọ dị ọkụ, na-atụgharị na ngwọta mgbe ọ dị jụụ. A na-eji ya eme ihe n'ọtụtụ ebe n'ime nri esiri esi, nri e ghere eghe, desserts, sauces, ofe, ihe ọṅụṅụ na ihe ndị dị mkpa. na swiiti.
Nnukwu gel dị na methyl cellulose nwere ike gel karịa okpukpu atọ nke methyl cellulose thermal gels, ma nwee ihe nrapado siri ike, njide mmiri na njide ọdịdị.
Ọ na-enye ohere ka nri ndị emegharịgharịrị na-ejigide udidi siri ike ha chọrọ na mmetụta ọnụ ha na-atọ ụtọ ma n'oge ma ruo ogologo oge ka ha nweghachiri. Ngwa a na-ahụkarị bụ nri jụrụ oyi ngwa ngwa, ngwaahịa anaghị eri anụ, anụ arụgharịrị arụgharịrị, azụ na ngwaahịa mmiri na sausaji nwere obere abụba.
Oge nzipu: Dec-12-2022