Zita rekuti HPMC muchiChinese nderekuti hydroxypropyl methylcellulose. Haina ionic uye inowanzoshandiswa semushonga unochengetedza mvura mudhaka rakasanganiswa rakaoma. Ndiyo inonyanya kushandiswa kuchengetedza mvura mudhaka.
Maitiro ekugadzira HPMC inonyanya kugadzirwa ne polysaccharide-based ether inogadzirwa ne alkalization uye etherification ye cotton fiber (yemumba). Haina chaji pachayo, haishande nema ions ane chaji ari mu gelling material, uye ine mashandiro akagadzikana. Mutengo wayo wakadererawo pane mamwe marudzi e cellulose ethers, saka inoshandiswa zvakanyanya mu dry-mixed mortar.
Basa rehydroxypropyl methylcellulose: Inogona kukora dhaka richangobva kusanganiswa kuti rive nekunyorova kwakati uye kudzivirira kupatsanurwa. (Kukora) Kuchengetwa kwemvura ndicho chinhu chakakoshawo, chinobatsira kuchengetedza huwandu hwemvura yakasununguka mudhaka, kuitira kuti mushure mekunge dhaka ragadzirwa, zvinhu zvinosimbisa simende zvine nguva yakawanda yekuwedzera mvura. (Kuchengetwa kwemvura) Ine hunhu hwekupinda mumhepo, izvo zvinogona kuunza mabubble emhepo akafanana uye akanaka kuti ivandudze kuvaka dhaka.
Kana viscosity yehydroxypropyl methylcellulose ether yakakwira, zvinoita kuti kuchengetedza mvura kurambe kuri nani. Viscosity ndiyo chinhu chakakosha pakushanda kweHPMC. Parizvino, vagadziri vakasiyana veHPMC vanoshandisa nzira dzakasiyana uye zvishandiso kuyera viscosity yeHPMC. Nzira huru ndiHaakeRotovisko, Hoppler, Ubbelohde naBrookfield.
Pachigadzirwa chimwe chete, mhedzisiro ye viscosity inoyerwa nenzira dzakasiyana dzakasiyana kwazvo, uye dzimwe dzine musiyano wakapetwa kaviri. Saka, kana tichienzanisa viscosity, inofanira kuitwa pakati penzira dzakafanana dzekuedza, kusanganisira tembiricha, rotor, nezvimwewo. Nezvehukuru hwe particles, particle yakatetepa, kuchengetedza mvura kuri nani. Mushure mekunge particles hombe dze cellulose ether dzasangana nemvura, pamusoro payo panobva panyunguduka uye panogadzira gel yekuputira zvinhu kudzivirira mamorekuru emvura kuti asarambe achipinda. Dzimwe nguva haigone kupararira zvakaenzana uye kunyunguduka kunyangwe mushure mekukurunga kwenguva refu, zvichigadzira mhinduro ine makore kana agglomeration. Inokanganisa zvakanyanya kuchengetedza mvura kwe cellulose ether, uye kunyunguduka ndechimwe chezvinhu zvekusarudza cellulose ether.
Kupfava zvakare chiratidzo chakakosha chekushanda kwemethyl cellulose ether. Iyo MC inoshandiswa pakugadzira dry powder mortar inofanirwa kunge iri upfu, ine mvura shoma, uye kupfava kwayo kunodawo 20% ~ 60% yehukuru hwe particles kuti ive pasi pe63um. Kupfava uku kunokanganisa kunyungudika kwehydroxypropyl methylcellulose ether. MC yakawanda inowanzova granular, uye iri nyore kunyungudika mumvura isina agglomeration, asi mwero wekunyungudika unononoka, saka haina kukodzera kushandiswa mudry powder mortar.
Mumortar yeupfu hwakaoma, MC inoparadzirwa pakati pezvinhu zvekusimbisa zvakaita seaggregate, filler fine nesimende, uye upfu hwakatsetseka chete ndihwo hunogona kudzivirira methyl cellulose ether agglomeration kana ichisanganiswa nemvura. Kana MC ikaiswa nemvura kuti inyungudise ma agglomerates, zvakaoma zvikuru kupararira nekunyungudika. Kupfava kweMC hakungoparadzi chete, asiwo kunoderedza simba remortar. Kana dry powder yakadaro ikashandiswa munzvimbo yakakura, kumhanya kwemortar yeupfu hwakaoma yemunharaunda kuchaderedzwa zvakanyanya, uye kuputika kuchaonekwa nekuda kwenguva dzakasiyana dzekupisa. Kune mortar yakapfapfaidzwa nekugadzirwa kwemuchina, chinodiwa chekupfava chakakwira nekuda kwenguva pfupi yekusanganisa. Kazhinji, viscosity yakakwira, zvinoita kuti mvura irambe ichichengetwa zvakanaka. Zvisinei, viscosity yakakwira uye huremu hwemamorekuru hweMC hwakakwira, kudzikira kwakafanana kwekunyungudika kwayo kuchava nemhedzisiro yakaipa pasimba uye mashandiro ekuvaka mortar.
Kana viscosity yakakwira, zvinoita kuti simbi iwedzere kukora, asi haina kuenzana zvakananga. Kana viscosity yakakwira, ndipo panonyanya kusimba simbi yakanyorova, kureva kuti, panguva yekuvaka, inoonekwa sekunamatira pachinhu chinokwenya uye ichinamatira zvakanyanya kune substrate. Asi hazvibatsiri kuwedzera simba rechimiro chesimbi yakanyorova pachayo. Kureva kuti, panguva yekuvaka, kushanda kweanti-sag hakusi pachena. Kusiyana neizvi, mamwe ma viscosity epakati nepasi asi akagadziriswa methyl cellulose ethers ane basa rakanaka mukuvandudza simba rechimiro chesimbi yakanyorova.
Kuchengetwa kwemvura kweHPMC kune chekuitawo netembiricha inoshandiswa, uye kuchengetwa kwemvura kwemethyl cellulose ether kunoderera nekuwedzera kwetembiricha. Zvisinei, mukushandiswa kwezvinhu chaizvo, dry powder mortar inowanzoiswa kune substrates dzinopisa patembiricha dzakakwirira (dzinopfuura madhigirii makumi mana) munzvimbo dzakawanda, dzakadai sekuiswa kwepurasitiki pamadziro ekunze pasi pezuva muzhizha, izvo zvinowanzo kurumidzisa Kucheneswa kwesimende uye kuoma kwe dry powder mortar. Kudzikira kwehuwandu hwekuchengetedza mvura kunotungamira kune kunzwa kuri pachena kuti kushanda uye kuramba kupwanyika zvinokanganiswa, uye zvakakosha zvikuru kuderedza simba rezvinhu zvinopisa pasi pemamiriro ezvinhu aya.
Panyaya iyi, zvinowedzerwa zve methyl hydroxyethyl cellulose ether parizvino zvinoonekwa sezviri pamberi pekuvandudzwa kwetekinoroji. Kunyangwe huwandu hwe methyl hydroxyethyl cellulose huchiwedzerwa (fomula yezhizha), kugona kushanda uye kuramba kupwanyika hazvisati zvakwanisa kuzadzisa zvinodiwa zvekushandisa. Kuburikidza nekurapwa kwakakosha paMC, senge kuwedzera mwero we etherification, nezvimwewo, mhedzisiro yekuchengetedza mvura inogona kuchengetedzwa patembiricha yakakwira, kuitira kuti igone kupa mashandiro ari nani mumamiriro ezvinhu akaoma.
Chiyero cheHPMC hachifanirwe kunge chakanyanya kukwira, zvikasadaro chinowedzera kudiwa kwemvura mumota, chinonamatira patrowel, uye nguva yekuiswa ichave yakareba zvakanyanya, izvo zvinokanganisa kugadzirwa. Zvigadzirwa zvakasiyana zvemota zvinoshandisa HPMC ine viscosity dzakasiyana, uye hazvishandise HPMC ine viscosity yakakura zvisina tsarukano. Saka, kunyangwe zvigadzirwa zvehydroxypropyl methylcellulose zvakanaka, zvinorumbidzwa kana zvikashandiswa zvakanaka. Kusarudza HPMC yakakodzera ndiro basa guru revashandi vemarabhoritari vemabhizinesi. Parizvino, vatengesi vazhinji vasina hunhu vari kuwedzera HPMC, uye mhando yacho haina kunaka. Pakusarudza cellulose yakati, marabhoritari inofanira kuita basa rakanaka mukuyedza kuona kuti chigadzirwa chemota chakasimba, uye usachiva nemakaro emutengo wakaderera uye wokonzera kurasikirwa kusingakoshi.
Nguva yekutumira: Chivabvu-04-2023