Iyo yakakwirira viscosity yehydroxypropyl methylcellulose, zviri nani kuchengetedza mvura kuita.Viscosity yakakosha parameter yeHPMC performance.Parizvino, vagadziri veHPMC vakasiyana vanoshandisa nzira dzakasiyana uye zviridzwa kuyera viscosity yeHPMC.Nzira huru ndidzo HaakeRotovisko, Hoppler, Ubbelohde uye Brookfield.
Pachigadzirwa chimwe chete, mhedzisiro yeviscosity yakayerwa nenzira dzakasiyana zvakasiyana kwazvo, uye mamwe anotopetwa kaviri misiyano.Naizvozvo, kana uchienzanisa viscosity, inofanirwa kuitwa pakati pedzimwe nzira dzekuyedza, kusanganisira tembiricha, rotor, nezvimwe.
Nezve saizi yechidimbu, kutsetseka kwechikamu, kunova nani kuchengetedza kwemvura.Mushure mekunge zvimedu zvakakura zve cellulose ether zvasangana nemvura, nzvimbo yacho inonyungudika pakarepo uye inoita gel yekuputira zvinhu kudzivirira mamorekuru emvura kuti arambe achipinda.Dzimwe nguva haigone kuparadzirwa zvakafanana uye kunyungudutswa kunyangwe mushure menguva refu yekubvongodza, ichigadzira cloudy flocculent solution kana agglomeration.Inobata zvakanyanya kuchengetwa kwemvura ye cellulose ether, uye solubility chimwe chezvinhu zvekusarudza cellulose ether.
Fineness zvakare yakakosha kuita index yemethyl cellulose ether.Iyo MC inoshandiswa kune yakaoma poda dhaka inodiwa kuti ive hupfu, ine yakaderera mvura yemukati, uye iyo fineness inodawo 20% -60% yehukuru hwechikamu kuti ive isingasviki 63um.Iko kunaka kunokanganisa kunyungudika kwehydroxypropyl methylcellulose ether.Coarse MC inowanzoita granular, uye iri nyore kunyunguduka mumvura isina agglomeration, asi chiyero chekunyungudika chinononoka, saka haina kukodzera kushandiswa muvhu rakaoma dhaka.
Mune yakaoma poda dhaka, MC inoparadzirwa pakati pezvinhu zvekusimbisa senge aggregate, yakanaka yekuzadza uye simende, uye chete yakanaka yakakwana poda inogona kudzivirira methyl cellulose ether agglomeration kana ichisanganiswa nemvura.Kana MC yawedzerwa nemvura kuti iparadze ma agglomerates, zvinonetsa kuparadzira nekunyungudutsa.Coarse fineness yeMC haisi kungoparadza chete, asiwo inoderedza simba renzvimbo yedhaka.Kana dhaka rakaoma rakadaro rinoshandiswa munzvimbo yakakura, kukurumidza kukurumidza kwepoda yakaoma yepoda ichaderedzwa zvakanyanya, uye kuputika kuchaonekwa nekuda kwekusiyana kwekuporesa nguva.Kune iyo yakapfapfaidzwa dhaka ine mechanical kuvaka, chinodiwa chefineness chakakwira nekuda kwenguva pfupi yekusanganisa.
Kazhinji kutaura, iyo yakakwirira viscosity, zviri nani kuchengetedza mvura.Nekudaro, iyo yakakwira viscosity uye nekukwirira kwema molecular huremu hweMC, kuderera kunoenderana mukunyungudika kwayo kuchava nemhedzisiro yakaipa pakusimba uye kuita kwekuvaka kwedhaka.Iyo yakakwirira viscosity, iyo inonyanya kuoneka iyo thickening maitiro padhaka, asi haina kuenzana zvakananga.Iyo yakakwirira iyo viscosity, iyo yakanyanya viscous dhaka rakanyorova richava, ndiko kuti, panguva yekuvaka, inoratidzirwa sekunamatira kune scraper uye yakakwirira kunamatira kune substrate.Asi hazvibatsiri kuwedzera simba rekuumbwa kwevhu rakanyorova pacharo.Panguva yekuvaka, iyo anti-sag performance haisi pachena.Pane zvinopesana, imwe yepakati uye yakaderera viscosity asi yakagadziridzwa methyl cellulose ethers ine yakanakisa mashandiro mukuvandudza kusimba kwechimiro chedhaka rakanyorova.
Iyo yakawanda yakawanda ye cellulose ether yakawedzerwa kune dhaka, zviri nani kuchengetedza kwemvura kushanda, uye yakakwirira viscosity, zviri nani kuchengetedza mvura kushanda.
Iko kunaka kweHPMC zvakare kune imwe mhedzisiro pakuchengetedza kwayo mvura.Kazhinji, kune methyl cellulose ethers ine viscosity yakafanana asi kunaka kwakasiyana, pasi pemwero wekuwedzera mumwe chete, kukwenenzvera ndiko kunoita kuti mvura ichengetedze.
Kuchengetwa kwemvura kweHPMC kunoenderanawo nekupisa kunoshandiswa, uye kuchengetwa kwemvura kwemethyl cellulose ether kunodzikira nekuwedzera kwekushisa.Nekudaro, mumashandisirwo chaiwo emidziyo, yakaoma poda dhaka inowanzoiswa kune inopisa substrates patembiricha yakakwira (inodarika 40 madhigirii) munzvimbo dzakawanda, sekunze kwemadziro putty plastering pasi pezuva muzhizha, izvo zvinowanzo mhanyisa Kuporeswa kwesimende uye kuoma kwe. poda yakaoma dhaka.
Kudzikira kwechiyero chekuchengetedza mvura kunotungamira kumanzwiro ari pachena ekuti zvese kushanda uye kutsemuka kuramba zvinokanganiswa, uye zvinonyanya kukosha kudzikisa pesvedzero yemamiriro ekushisa pasi peichi mamiriro.Kunyange zvazvo methyl hydroxyethyl cellulose ether additives pari zvino inofungidzirwa kuti iri mberi kwekuvandudzwa kwetekinoroji, kuvimba kwavo nekupisa kucharamba kuchikonzera kupera simba kwekuita kwevhu rakaoma dhaka.
Wedzera huwandu hwemethyl hydroxyethyl cellulose, kushanda uye kutsemuka kuramba kuchiri kusakwanisa kuzadzisa zvinodiwa zvekushandisa.Kuburikidza nekumwe kurapwa kwakakosha paMC, sekuwedzera dhigirii reetherification, nezvimwewo, iyo yekuchengeta mvura inogona kuchengetedzwa patembiricha yepamusoro, kuitira kuti igone kupa kuita zvirinani pasi pemamiriro akaomarara.
Nguva yekutumira: Kubvumbi-10-2023