Zita reChinese reHPMC ndiro hydroxypropyl methylcellulose. Iyo isiri-ionic uye inowanzoshandiswa sechinhu chekuchengetedza mvura mudhaka yakaoma-yakasanganiswa. Ndiyo inonyanya kushandiswa kuchengetedza mvura mudhaka.
Maitiro ekugadzira eHPMC anonyanya kuve polysaccharide-based ether chigadzirwa chinogadzirwa nealkalization uye etherification yekotoni fiber (yemumba). Iyo haina kubhadharisa pachayo, haibatike neiyo inochajirwa mune iyo gelling zvinhu, uye ine yakagadzikana kuita. Mutengo wacho wakadererawo pane mamwe marudzi e-cellulose ethers, saka inoshandiswa zvakanyanya mumatope akaoma-akasanganiswa.
Basa rehydroxypropyl methylcellulose: Inogona kukobvuta dhaka richangobva kusanganiswa kuti ive neimwe yakanyorova viscosity uye kudzivirira kusarura. (Thickening) Kuchengetedzwa kwemvura ndiyowo hunhu hunonyanya kukosha, hunobatsira kuchengetedza huwandu hwemvura yakasununguka mudhaka, kuitira kuti mushure mekuvakwa kwedhaka, iyo simende ine nguva yakawanda yemvura. (Kuchengetwa kwemvura) Iine mhepo-inopinza zvinhu, iyo inogona kuunza yunifomu uye yakanaka mabhubhu emhepo kuvandudza kuvakwa kwedhaka.
Iyo yakakwirira viscosity yehydroxypropyl methylcellulose ether, 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 tichienzanisa viscosity, inofanirwa kuitwa pakati pedzimwe nzira dzekuyedza, kusanganisira tembiricha, rotor, nezvimwe. Nezve saizi yechidimbu, iyo yakatsetseka chidimbu, zviri nani kuchengetedza mvura. 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 kutsetseka kunodawo 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. Ndiko kuti, 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.
Kuchengetwa kwemvura kweHPMC kunoenderanawo nekushisa 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.
Panyaya iyi, methyl hydroxyethyl cellulose ether additives pari zvino inofungidzirwa kuti iri pamberi pekuvandudza tekinoroji. Kunyangwe huwandu hwemethyl hydroxyethyl cellulose huchiwedzerwa (muchirimo fomula), kushanda uye kuramba kutsemuka hakugone kuzadzisa zvinodiwa zvekushandisa. Kuburikidza nekumwe kurapwa kwakakosha paMC, sekuwedzera dhigirii reetherification, nezvimwewo, iyo yekuchengeta mvura inogona kuchengetedzwa patembiricha yepamusoro, kuitira kuti igone kupa kushanda kuri nani pasi pemamiriro akaomarara.
Chiyero cheHPMC hachifaniri kunge chakanyanya kukwirira, kana zvisina kudaro chichawedzera kudiwa kwemvura yedhaka, inonamatira kune trowel, uye nguva yekuisa ichave yakareba, iyo inokanganisa kuvakwa. Zvigadzirwa zvedhaka zvakasiyana zvinoshandisa HPMC ine viscosities yakasiyana, uye usashandise high-viscosity HPMC zvakasununguka. Naizvozvo, kunyangwe zvigadzirwa zvehydroxypropyl methylcellulose zvakanaka, zvinoomberwa kana zvikashandiswa zvakanaka. Kusarudza iyo HPMC chaiyo ibasa rekutanga revashandi vemurabhoritari. Parizvino, vatengesi vazhinji vasina kutendeseka vari kusanganisa HPMC, uye mhando yacho haina kunaka. Pakusarudza imwe cellulose, marabhoritari inofanirwa kuita basa rakanaka mukuyedza kuona kugadzikana kwechigadzirwa chedhaka, uye usakara kudhura uye kukonzera kurasikirwa kusingakoshi.
Nguva yekutumira: May-04-2023