A:
MC bụ methyl cellulose: a nụchara anụcha owu mgbe ọgwụgwọ alkali, methane chloride dị ka etherifying gị n'ụlọnga, site a usoro nke mmeghachi omume ime cellulose ether. N'ozuzu, ogo nke nnọchi bụ 1.6 ~ 2.0, na solubility dịgasị iche na ogo nke nnọchi. Ọ bụ nke nonionic cellulose ether.
(1) Njide mmiri nke methyl cellulose na-adabere na ego mgbakwunye ya, viscosity, urughuru mma na mgbasa ozi. N'ozuzu tinye nnukwu ego, obere mma, viscosity, ọnụ ọgụgụ njide mmiri dị elu. Ọnụ ọgụgụ nke ihe mgbakwunye nwere mmetụta dị ukwuu na njide mmiri, na viscosity adịghị adabere na njide mmiri. The mgbasa ọnụego tumadi na-adabere n'elu mgbanwe ogo na urughuru fineness nke cellulose ahụ. N'ime ọtụtụ cellulose ethers dị n'elu, methyl cellulose na HPMC hydroxypropyl methyl cellulose ọnụ ọgụgụ njide mmiri dị elu.
(2) Methyl cellulose bụ soluble na mmiri oyi, nke siri ike igbari na mmiri ọkụ. Ya aqueous ngwọta bụ nnọọ ike n'ime pH = 3 ~ 12. Ọ nwere ezigbo ndakọrịta na starch, guanidine chịngọm na ọtụtụ surfactants. Gelation na-eme mgbe okpomọkụ ruru ogo gelation.
(3) Mgbanwe nke okpomọkụ ga-emetụta oke njide mmiri nke methyl cellulose. N'ozuzu, ka okpomọkụ dị elu, na-akawanye njọ njigide mmiri. Ọ bụrụ na okpomọkụ nke ngwa agha gafere 40 ℃, mmiri na-ejide methyl cellulose ga-akawanye njọ, nke na-emetụta constructability nke ngwa agha.
(4) Methyl cellulose nwere mmetụta doro anya na constructability na adhesion nke ngwa agha. "Adhesion" ebe a na-ezo aka na adhesion nke onye ọrụ chere n'etiti ngwá ọrụ na mgbidi mgbidi, ya bụ nkwụsị nke ngwa agha. Adhesion buru ibu, nkwụsị nke mgbochi nke ngwa agha buru ibu, ike nke ndị ọrụ chọrọ na usoro iji mee ihe dịkwa ukwuu, na-ewu ngwa agha adịghị mma. Na ngwaahịa ether cellulose, adhesion nke methyl cellulose dị n'ogo dị oke ala.
HPMC bụ hydroxypropyl methyl cellulose: ọ na-mere nke nụchara anụcha owu mgbe alkali ọgwụgwọ, na propylene oxide na chloromethane dị ka etherifying gị n'ụlọnga, site a usoro nke mmeghachi omume na mere nke na-abụghị ionic cellulose agwakọta ether. Ogo nke nnọchi bụ n'ozuzu 1.2 ~ 2.0. Njirimara ya na-adịgasị iche na oke nke methoxy na hydroxypropyl ọdịnaya.
(1) HPMC hydroxypropyl methyl cellulose dị mfe soluble na mmiri oyi, nke siri ike igbari na mmiri ọkụ. Otú ọ dị, o doro anya na okpomọkụ gelation ya na mmiri ọkụ dị elu karịa nke methyl cellulose. Solubility nke methyl cellulose na mmiri oyi ka emekwara nke ọma.
(2) The viscosity nke HPMC hydroxypropyl methyl cellulose metụtara ya molekụla arọ, na elu nke molekụla arọ, na elu viscosity. Okpomọkụ na-emetụtakwa viscosity. Viscosity na-ebelata ka okpomọkụ na-abawanye. Ma mmetụta ya viscosity elu okpomọkụ dị ala karịa nke methyl cellulose. Ngwọta ahụ kwụsiri ike mgbe echekwara ya na ụlọ okpomọkụ.
(3) HPMC hydroxypropyl methyl cellulose kwụsiri ike na acid na isi, yana ngwọta mmiri ya kwụsiri ike na pH = 2 ~ 12. Caustic soda na mmiri lime enweghị mmetụta dị nta na akụrụngwa ya, mana alkali nwere ike mee ka ọnụego mgbasa ya dịkwuo elu ma melite viscosity. HPMC hydroxypropyl methyl cellulose kwụsiri ike na nnu n'ozuzu, ma mgbe ntinye nke ngwọta nnu dị elu, viscosity nke HPMC hydroxypropyl methyl cellulose ngwọta na-abawanye.
(4) Njide mmiri nke HPMC hydroxypropyl methyl cellulose na-adabere na usoro ọgwụgwọ ya na viscosity ya, na ọnụ ọgụgụ njide mmiri nke HPMC hydroxypropyl methyl cellulose dị elu karịa nke methyl cellulose n'otu usoro ọgwụgwọ.
(5) HPMC hydroxypropyl methyl cellulose nwere ike ịgwakọta ya na mmiri-soluble polymer ogige ịghọ edo, elu viscosity ngwọta. Dị ka mmanya polyvinyl, starch ether, akwukwo nri gluu na na.
(6) Adhesion nke HPMC hydroxypropyl methyl cellulose na ngwa agha owuwu dị elu karịa nke methyl cellulose.
(7) HPMC hydroxypropyl methyl cellulose nwere mma enzyme eguzogide karịa methyl cellulose, na ya ngwọta enzyme mbibi ekwe omume bụ ala karịa nke methyl cellulose.
Oge nzipu: Mee-26-2022