Hydroxypropyl methylcellulose (HPMC) ipolymer inonyungudika mumvura isinganyungudike inowanikwa nekushandiswa kwemakemikari e cellulose yechisikigo. Inoshandiswa zvakanyanya muindasitiri yezvekudya, mishonga, zvizoro uye kuvaka, kunyanya seglue, thickener, emulsifier uye suspending agent mukugadzira mishonga. Mukushandiswa, hunhu hwe viscosity ye HPMC aqueous solution hwakakosha pakushanda kwayo muminda yakasiyana.
1. Maumbirwo uye hunhu hwehydroxypropyl methylcellulose
Maumbirwo emamorekuru eHPMC ane mapoka maviri anotsiva, hydroxypropyl (-CH2).₂CHOHCH₃) uye methyl (-OCH₃), izvo zvinoita kuti ive nekunyungudika kwakanaka kwemvura uye kugona kwayo kugadzirisa. HPMC molecular chain ine chimiro chakasimba, asi inogonawo kugadzira chimiro che network chine mativi matatu mumushonga wemvura, zvichikonzera kuwedzera kwe viscosity. Huremu hwayo hwemamorekuru, rudzi rwechinhu chinotsiva uye chiyero chekutsiva (kureva, chiyero chehydroxypropyl uye methyl substitution yeyuniti yega yega) zvine pesvedzero yakakosha pakusimba kwemhinduro.
2. Hunhu hwekusviba kwemvura
Hunhu hwe HPMC aqueous solution hunoenderana zvakanyanya nezvinhu zvakaita sehuwandu, huremu hwemamorekuru, tembiricha uye pH kukosha kwe solvent. Kazhinji, huwandu hwe HPMC aqueous solution hunowedzera nekuwedzera kwehuwandu hwayo. Huwandu hwayo hunoratidza maitiro asiri eNewtonian rheological, kureva kuti, sezvo shear rate ichiwedzera, huwandu hwe solution hunoderera zvishoma nezvishoma, zvichiratidza shear thinning.
(1) Mhedzisiro yekuisa pfungwa pachinhu chimwe chete
Pane hukama hwakati pakati pekusimba kweHPMC aqueous solution nekusimba kwayo. Sezvo kuwanda kweHPMC kuchiwedzera, kudyidzana kwemamorekuru mu aqueous solution kunowedzerwa, uye kusangana uye kubatana kwemamorekuru kunowedzera, zvichikonzera kuwedzera kwekusimba kwesolution. Pakusimba kwakaderera, kusimba kweHPMC aqueous solution kunowedzera zvakananga nekuwedzera kwekusimba, asi pakuwanda kwakakwirira, kukura kwekusimba kwesolution kunowanzova kwakati sandara uye kunosvika pakukosha kwakasimba.
(2) Mhedzisiro yehuremu hwemamorekuru
Huremu hwemamorekuru hweHPMC hunokanganisa zvakananga viscosity yemvura yayo. HPMC ine huremu hwakawanda hwemamorekuru ine macheni marefu emorekuru uye inogona kuumba chimiro chenetwork chakaomarara chetatu-dimensional mumushonga wemvura, zvichikonzera viscosity yakakwira. Kusiyana neizvi, HPMC ine huremu hwakaderera hwemamorekuru ine chimiro chenetwork chakasununguka uye viscosity yakaderera nekuda kwemacheni mapfupi emorekuru. Saka, paunenge uchiisa, zvakakosha kusarudza HPMC ine huremu hwakakodzera hwemamorekuru kuti uwane viscosity effect yakanaka.
(3) Mhedzisiro yekupisa
Kupisa chinhu chakakosha chinokanganisa kusimba kwemvura yeHPMC. Sezvo tembiricha ichiwedzera, kufamba kwemamorekuru emvura kunowedzera uye kusimba kwemvura kunowanzo derera. Izvi zvinodaro nekuti kana tembiricha yakwira, rusununguko rweHPMC molecular chain runowedzera uye kudyidzana pakati pemamorekuru kunoderera, nokudaro kunoderedza kusimba kwemvura. Zvisinei, mhinduro yeHPMC kubva kumabatch akasiyana kana mabrands kune tembiricha inogonawo kusiyana, saka mamiriro etembiricha anofanirwa kugadziriswa zvichienderana nezvinodiwa zvekushandisa.
(4) Mhedzisiro ye pH kukosha
HPMC pachayo imusanganiswa usiri weionic, uye viscosity yemvura yayo inononoka kuchinja kwepH. Kunyangwe HPMC ichiratidza hunhu hwakagadzikana hwe viscosity munzvimbo dzine acid kana neutral, kunyungudika uye viscosity yeHPMC zvinokanganiswa munzvimbo dzine acid yakawanda kana alkaline. Semuenzaniso, pasi pemamiriro e acid yakasimba kana alkaline yakasimba, mamorekuru eHPMC anogona kuora zvishoma, nokudaro zvichideredza viscosity yemvura yayo.
3. Kuongororwa kweRheological kwehunhu hwe viscosity hwe HPMC yemvura mhinduro
Maitiro e rheological e HPMC aqueous solution anowanzo ratidza hunhu hwemvura isiri yeNewtonian, zvinoreva kuti viscosity yayo haina chekuita nezvinhu zvakaita sekuwanda kwe solution uye huremu hwemamorekuru chete, asiwo ne shear rate. Kazhinji, pa shear rate yakaderera, HPMC aqueous solution inoratidza viscosity yakakwira, nepo shear rate ichiwedzera, viscosity inoderera. Hunhu uhwu hunonzi "shear thinning" kana "shear thinning" uye hwakakosha zvikuru mumabasa mazhinji anoshanda. Semuenzaniso, muminda ye coating, mishonga yekugadzira, kugadzira chikafu, nezvimwewo, shear thinning hunhu hwe HPMC hunogona kuona kuti viscosity yakakwira inochengetwa panguva ye low-speed applications, uye inogona kuyerera zviri nyore pasi pe high-speed shear conditions.
4. Zvimwe zvinhu zvinokanganisa viscosity ye HPMC yemvura mhinduro
(1) Mhedzisiro yemunyu
Kuwedzerwa kwemunyu (senge sodium chloride) kunogona kuwedzera viscosity ye HPMC aqueous solution. Izvi zvinodaro nekuti munyu unogona kuwedzera kudyidzana pakati pemamorekuru nekushandura simba re ionic remushonga, kuitira kuti mamorekuru eHPMC aumbe network structure diki, nokudaro zvichiwedzera viscosity. Zvisinei, mhedzisiro yerudzi rwemunyu uye huwandu hwayo pa viscosity inofanirawo kugadziriswa zvichienderana nemamiriro ezvinhu chaiwo.
(2) Mhedzisiro yezvimwe zvinowedzerwa
Kuwedzera zvimwe zvinowedzerwa (zvakaita sema surfactants, ma polymers, nezvimwewo) mumushonga wemvura weHPMC kunokanganisawo viscosity. Semuenzaniso, ma surfactants anogona kuderedza viscosity yeHPMC, kunyanya kana huwandu hwe surfactant hwakakwira. Pamusoro pezvo, mamwe ma polymers kana zvidimbu zvinogonawo kusangana neHPMC uye kuchinja hunhu hwe rheological hwemushonga wayo.
Hunhu hwe viscosityhydroxypropyl methylcellulose Mhinduro yemvura inokanganiswa nezvinhu zvakawanda, zvinosanganisira kuwanda kwayo, huremu hwemamorekuru, tembiricha, pH kukosha, nezvimwewo. Mhinduro yemvura yeHPMC inowanzo ratidza hunhu hwerheological husiri hweNewtonian, ine hunhu hwakanaka hwekukora uye kutetepa, uye inoshandiswa zvakanyanya muminda yakasiyana-siyana yemaindasitiri nemishonga. Kunzwisisa uye kugona hunhu uhwu hwe viscosity kuchabatsira kugadzirisa kushandiswa kweHPMC mumashandisirwo akasiyana. Mumashandisirwo anoshanda, mhando yakakodzera yeHPMC nemamiriro ekushanda anofanirwa kusarudzwa zvichienderana nezvinodiwa kuti uwane hunhu hwakanaka hwe viscosity uye rheological.
Nguva yekutumira: Kurume-01-2025