1. Cellulose ether
Cellulose ether izita rezita rezvakatevedzana zvezvigadzirwa zvinogadzirwa nekuita kwealkali cellulose uye etherifying agent pasi pemamwe mamiriro. Alkali cellulose inotsiviwa nema etherifying agents akasiyana kuti awane akasiyana cellulose ether. Zvinoenderana neiyo ionization yezvinhu zvinotsiva, cellulose ethers inogona kukamurwa kuita ionic mhando (senge carboxymethyl cellulose) uye isiri-ionic mhando (yakadai semethyl cellulose). Zvinoenderana nemhando dzezvinotsiva, cellulose ethers inogona kukamurwa kuita monoethers (senge methyl cellulose) uye yakasanganiswa ethers (senge hydroxypropyl methyl cellulose). Zvinoenderana nekunyungudika kwakasiyana, inogona kukamurwa kuita solubility yemvura (senge hydroxyethyl cellulose) uye organic solvent solubility (senge ethyl cellulose). Dry yakasanganiswa dhaka inonyanya kunyungudika selulosi yemvura, uye mvura soluble cellulose inogona kukamurwa kuita yekukurumidza mhando uye kunonoka kunyungudika mhando mushure mekurapwa kwepamusoro.
Maitiro ekuita kwe cellulose ether mudhaka ndeaya anotevera:
(1) Mushure mekunge cellulose ether mudhaka yanyungudutswa mumvura, kugovera kunoshanda uye kwakafanana kwesementitious zvinhu muhurongwa kunovimbiswa nekuda kwekuita kwepamusoro. Sechidziviriro colloid, cellulose ether "inoputira" zvimedu zvakasimba uye inogadzira firimu remafuta ekuzora pamusoro payo yekunze, iyo inoita kuti dhaka rigadzikane, uye rinovandudza kuyerera kwedhaka mukusanganiswa uye kutsetseka kwe kuvaka.
(2) Nekuda kwemaitiro emamorekuru emushonga we cellulose ether, mvura iri mudhaka haisi nyore kurasikirwa, uye zvishoma nezvishoma inoburitswa munguva yakareba, ichipa dhaka kuchengetedza zvakanaka kwemvura uye kushanda.
1.1.1 Methylcellulose (MC)
Iyo donje yakanatswa inobatwa nealkali, uye cellulose ether inogadzirwa kuburikidza neyakatevedzana maitiro nemethyl chloride se etherifying agent. Kazhinji, dhigirii rekutsiva i1.6 ~ 2.0, uye kunyungudika kunosiyana nedanho rekutsiva. Iyo ndeye isiri-ionic cellulose ether.
(1) Methylcellulose inonyungudika mumvura inotonhora, asi yakaoma kunyungudika mumvura inopisa, uye mhinduro yayo ine aqueous yakagadzikana muhuwandu hwepH = 3 ~ 12. Iine kuenderana kwakanaka ne starch, guar gum uye akawanda ma surfactants. Kana tembiricha inosvika tembiricha yegel, gel phenomenon ichaitika.
(2) Kuchengetwa kwemvura kwemethyl cellulose kunoenderana nehuwandu hwayo hwekuwedzera, viscosity, particle fineness uye dissolution rate. Kazhinji, mwero wekuchengetedza mvura wakakwira nehuwandu hukuru hwekuwedzera, hunyoro hudiki uye viscosity hombe. Mari yekuwedzera ine simba guru pamusoro pehuwandu hwekuchengetedza mvura, uye viscosity haina kuenzana zvakananga nehuwandu hwekuchengetedza mvura. Mwero wekunyunguduka unonyanya kuenderana nedhigirii rekugadzirisa uye chidimbu chidiki che cellulose particles. Pakati pema cellulose ethers ari pamusoro, methyl cellulose uye hydroxypropyl methyl cellulose vane kuchengetwa kwemvura kwakanyanya.
(3) Shanduko yekushisa ichakanganisa zvakanyanya mwero wekuchengetedza mvura yemethyl cellulose. Kazhinji, kukwirisa tembiricha, kunowedzera kuchengetedzeka kwemvura. Kana tembiricha yedhaka ikapfuura 40 ℃, iyo mvura yekuchengetedza midziyo yemethyl cellulose ichave yakanyanya kuipa, izvo zvinokanganisa zvakanyanya kushanda kwedhaka.
(4) Methylcellulose ine simba riri pachena pakushanda uye kunamatira kwedhaka. “Kunamira” pano kunoreva simba rinonamira rinonzwikwa pakati pematurusi ekupenda evashandi nechikamu chepamadziro, ndiko kuti, kugerwa kwedhaka. Iyo yekunamatira yakakura, iyo shear resistance yedhaka yakakura, uye simba rinodiwa nevashandi mukushandiswa kwekushandisa kwakakurawo, saka kuvakwa kwedhaka kwakashata. Mune cellulose ether zvigadzirwa, kunamatira kwemethyl cellulose kuri padanho repakati.
1.1.2 Hydroxypropyl methyl cellulose (HPMC)
Hydroxypropyl methyl cellulose (HPMC) imhando ye cellulose ine goho uye dosi iri kuwedzera nekukurumidza mumakore achangopfuura. Iyo isiri-ionic cellulose yakasanganiswa ether yakagadzirwa kubva kudonje rakanatswa mushure mekurapa alkalization, uchishandisa epoxy propane uye methyl chloride se etherifying agent kuburikidza neakatevedzana maitiro. Dhigirii rekutsiva kazhinji 1.2 ~ 2.0. Zvimiro zvayo zvakasiyana zvichienderana nehuwandu hwemethoxy content uye hydroxypropyl content.
(1) Hydroxypropyl methyl cellulose inonyungudika nyore nyore mumvura inotonhora, asi yakaoma kunyungudika mumvura inopisa. Nekudaro, tembiricha yayo yegel mumvura inopisa yakakwira zvakanyanya kupfuura yemethyl cellulose. Kuenzaniswa nemethyl cellulose, iyo solubility mumvura inotonhora zvakare inovandudzwa zvakanyanya.
(2) Iyo viscosity yehydroxypropyl methyl cellulose ine hukama nehuremu hwayo hwemamorekuru, uye iyo yakakwira huremu hwemamorekuru, iyo inokwirisa viscosity. Iyo tembiricha ichakanganisawo viscosity yayo, uye viscosity inoderera kana tembiricha yakwira. Nekudaro, mhedzisiro yeyakakwira viscosity uye tembiricha yakaderera pane iyo yemethyl cellulose. Mhinduro yacho yakagadzikana pakupisa kwekamuri.
(3) Kuchengetwa kwemvura kweHPMC kunoenderana nehuwandu hwayo hwekuwedzera uye viscosity, uye mwero wayo wekuchengetedza mvura wakakwira kupfuura wemethyl cellulose pachiyero chimwe chekuwedzera.
(4) Hydroxypropyl methylcellulose yakagadzikana kune acids uye mabhesi, uye mhinduro yayo ine aqueous yakagadzikana muhuwandu hwepH = 2 ~ 12. Caustic soda uye mvura yeraimu haina mhedzisiro pakuita kwayo, asi alkali inogona kukurumidza kunyungudika kwayo uye kugadzirisa pini yeviscosity. Hydroxypropyl methylcellulose yakagadzikana kune yakajairwa munyu, asi kana kusanganiswa kwemunyu munyu kwakakwira, viscosity yehydroxypropyl methylcellulose mhinduro inowedzera kuwedzera.
(5) Hydroxypropyl methyl cellulose inogona kusanganiswa nemvura-soluble macromolecular compounds kuti iite yunifomu mhinduro ine viscosity yakakwirira. Zvakadai se polyvinyl doro, starch ether, muriwo gum, nezvimwe.
(6) Hydroxypropyl methyl cellulose ine nani enzyme kuramba pane methyl cellulose, uye mukana wekukanganisa enzymatic yemushonga wayo wakaderera pane wemethyl cellulose.
(7) Kunamatira kwehydroxypropyl methyl cellulose kukuvaka kwedhaka kwakakwira kupfuura iyo yemethyl cellulose.
1.1.3 Hydroxyethyl cellulose (HEC)
Iyo donje yakanatswa inogadzirwa nekuita ne ethylene oxide se etherifying agent pamberi peacetone mushure mekurapa alkali. Dhigirii rekutsiva kazhinji 1.5 ~ 2.0. Iyo ine yakasimba hydrophilicity uye iri nyore kutora unyoro.
(1) Hydroxyethyl cellulose inonyungudika mumvura inotonhora, asi yakaoma kunyungudika mumvura inopisa. Mhinduro yacho yakagadzikana pakupisa kwepamusoro uye haina gel pfuma. Inogona kushandiswa kwenguva yakareba pasi pepakati nepamusoro tembiricha yedhaka, asi kuchengetwa kwayo kwemvura kwakaderera pane iyo yemethyl cellulose.
(2) Hydroxyethyl cellulose yakagadzikana kune yakajairika acids uye mabhesi. Alkali inogona kukurumidza kuparara kwayo uye zvishoma kuvandudza viscosity yayo. Kupararira kwayo mumvura kwakashata zvishoma kupfuura iyo yemethyl cellulose uye hydroxypropyl methyl cellulose.
(3) Hydroxyethyl cellulose ine mashandiro akanaka muanti sagging yedhaka, asi ine nguva refu yekudzosa simende.
(4) Kuita kwehydroxyethyl cellulose inogadzirwa nemamwe mabhizinesi epamba yakaderera zvakanyanya pane iyo yemethyl cellulose nekuda kwehuwandu hwemvura uye madota.
1.1.4 Carboxymethyl cellulose
Iyo ionic cellulose ether inogadzirwa kubva kune yakasikwa fibers (donje, nezvimwewo) mushure mekurapwa kwealkali, uchishandisa sodium monochloroacetate se etherifying agent, uye kuburikidza nekutevedzana kwemaitiro. Dhigirii rayo rekutsiva rinowanzo 0.4 ~ 1.4, uye kuita kwayo kunokanganiswa zvakanyanya nedhigirii rekutsiva.
(1) Carboxymethyl cellulose yakanyanya hygroscopic, uye ichange iine mvura yakawanda kana yachengetwa pasi pemamiriro ezvinhu.
(2) Iyo carboxymethyl cellulose aqueous solution haizobudisi gel, uye viscosity inoderera nekuwedzera kwekushisa. Kana tembiricha yadarika 50 ℃, viscosity haidzokerike.
(3) Kugadzikana kwayo kunokanganisa zvakanyanya pH. Kazhinji, inogona kushandiswa mune gypsum based mortar, asi kwete musimende yakavakirwa dhaka. Mupamusoro alkalinity, viscosity icharasika.
(4) Kuchengetwa kwayo kwemvura kwakadzikira zvakanyanya kupfuura kwemethyl cellulose. Iyo ine retarding mhedzisiro pane gypsum based mortar uye inoderedza simba rayo. Nekudaro, mutengo wecarboxymethyl cellulose wakadzikira zvakanyanya pane wemethyl cellulose.
2. Redispersible polymer hupfu
Redispersible rubber poda inogadzirwa neakakosha polymer lotion kuburikidza nekupfapfaidza kuomesa. Munguva yekugadziriswa, inodzivirira colloid uye anti kuomesera mumiririri inova yakakosha yekuwedzera. Iyo yakaomeswa rabha hupfu ndeye 80 ~ 100mm spherical zvidimbu zvakaungana pamwechete. Zvimedu izvi zvinogona kunyungudika mumvura uye zvinogadzira kupararira kwakagadzikana kwakakura zvishoma pane yekutanga lotion particles. Kupararira uku kuchaita firimu mushure mekupera mvura uye kuoma. Iyi firimu haidzokerike seyakagadzirwa firimu reyakajairwa lotion, uye haizopararire mukupararira kana wasangana nemvura.
Redispersible rubber poda inogona kukamurwa kuita styrene butadiene copolymer, tertiary ethylene carbonate copolymer, ethylene acetic acid copolymer, nezvimwewo, uye pahwaro uhwu, organic silicon uye vinyl laurate inogona kubatanidzwa kuvandudza kushanda. Matanho ekugadzirisa akasiyana anoita kuti redispersible rubber poda ive nemhando dzakasiyana senge mvura inodzivirira, alkali kuramba, kuramba mamiriro ekunze uye kuchinjika. Iine vinyl laurate uye organic silicon, iyo inogona kuita kuti hupfu hwerabha ive yakanaka hydrophobicity. Yakanyanya branched ethylene tertiary carbonate ine yakaderera Tg kukosha uye yakanaka kuchinjika. Kuiswa kwehupfu uhu mudhaka kune mhedzisiro yekudzoreredza panguva yekugadzika simende, asi kudzoreredza mhedzisiro idiki pane yekushandiswa kwakananga kwelotion yakafanana. Kusiyana neizvi, kudzoreredza mhedzisiro ye styrene butadiene yakakura kupfuura ye ethylene vinyl acetate. Kana iyo dosi yakanyanya kudiki, kuvandudzwa kwekuita kwedhaka hakusi pachena.
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Nguva yekutumira: Oct-24-2022