Yakakosha sei viscosity yemethyl cellulose ether yegypsum mortar?

Yakakosha sei viscosity yemethyl cellulose ether yegypsum mortar?

Mhinduro: Viscosity inokosha parameter yekushanda kwemethyl cellulose ether.

Kazhinji kutaura, iyo yakakwirira viscosity, zviri nani kuchengetedza mvura kwegypsum mortar. Nekudaro, iyo yakakwira viscosity, iyo yakakwira molecular huremu hwemethyl cellulose ether, uye 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 iyo dhaka rakanyorova richava. Panguva yekuvaka, inoratidzirwa sekunamatira kune scraper uye yakakwirira kunamatira kune substrate. Asi hazvibatsiri kuwedzera simba rekuumbwa kwevhu rakanyorova pacharo. Mukuwedzera, panguva yekuvaka, iyo anti-sag kuita kwevhu rakanyorova haisi pachena. Pane zvinopesana, imwe yepakati uye yakaderera viscosity asi yakagadziridzwa methyl cellulose ethers ine yakanakisa mashandiro mukuvandudza kusimba kwechimiro chedhaka rakanyorova.

Ko kunaka kwe cellulose ether kudhaka kwakakosha zvakadii?

Mhinduro: Iyo yakanaka zvakare yakakosha kuita index yemethyl cellulose ether. Iyo MC inoshandiswa kudhaka yakaoma yehupfu inodiwa kuti ive hupfu ine yakaderera mvura zvirimo, uye kutsetseka kunodawo 20% kusvika 60% yehukuru hwepakati kuve isingasviki 63m. Iko kunaka kunokanganisa kunyungudika kwemethyl cellulose ether. Coarse MC inowanzoita granular, iyo iri nyore kuparadzira uye kunyunguduka mumvura pasina agglomeration, asi chiyero chekunyungudika chinononoka, saka haina kukodzera kushandiswa mumatope akaoma. Zvimwe zvigadzirwa zvemumba zvinotenderera, hazvisi nyore kuparadzira uye kunyungudika mumvura, uye zviri nyore kuunganidza. 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 MC haisi kungoparadza chete, asiwo inoderedza simba remunharaunda yedhaka. Kana dhaka rakaoma rakadaro rinoshandiswa munzvimbo yakakura, kukurumidza kuporesa kwedhaka remunharaunda kuchaderedzwa zvakanyanya, uye kuputika kuchaonekwa nekuda kwekuporesa nguva dzakasiyana. Kune iyo yakapfapfaidzwa dhaka ine mechanical kuvaka, chinodiwa chefineness chakakwira nekuda kwenguva pfupi yekusanganisa.

Iko kunaka kweMC 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.

Ndeipi nzira yekusarudza cellulose?

Mhinduro: Nhamba ye cellulose ether inoshandiswa mumashandisirwo akasiyana-siyana inonyanya kuenderana nekudiwa kwekuchengetedza mvura. Inokodzera marudzi ese edhaka. Zvikamu zvinonyudza zvakanyanya zvinoda huwandu hweselulosi ether. Madhiri ane yunifomu saizi yekugovera uye nekudaro nzvimbo yakakura yepasi inodawo huwandu hwepamusoro hwe cellulose ether.

Iyo yakagadziridzwa yakatarwa inogona kusarudzwa kune anti-sagging zvinodiwa. Kana kugadziriswa kusina kukwana, starch ethers, kazhinji hydroxypropyl starch ethers, inogona kuwedzerwa kudzivirira sags.

Huwandu hwese uye saizi yezvikamu zvemafiritsi mukugadzirwa kunofanirwa kusarudzwa kuti ipe kutsetseka uye kuenderana kwakanaka.

Kusanganisa gypsum, filler, type uye huwandu hweselulosi ether uye mashandisiro estarch ether inofanirwa kusanganiswa nenzira dzinotevera:

Kana iyo yakaoma-yakavhenganiswa dhaka inowedzerwa kune imwe mvura yemvura, iyo yakawedzerwa inobva pahuwandu hwemvura, uye mvura yose yakanyoroveswa pasina kukonzera poda yakaoma nemvura yakarurama-ku-paste ratio. Kana izvo zvakasiyana-siyana zvakasanganiswa muchikamu chakakodzera, saka tinogona kuwana dhaka rakatsetseka rine midziyo yakakodzera yekushandisa mushure mekusanganisa.

Ndedzipi shanduko dzekuvaka gypsum nemumiriri wekuchengetedza mvura?

Mhinduro: Zvivako zvemadziro ekuvaka kazhinji zvimiro zveporous, uye ese ane simba rekunyudza mvura. Nekudaro, iyo gypsum yekuvakisa inoshandiswa pakuvaka madziro inogadzirwa nekuwedzera mvura kumadziro, uye mvura inonyudzwa nyore nemadziro, zvichikonzera kushaikwa kwemvura inodiwa ye hydration yegypsum, zvichikonzera kunetsa mukuvaka plaster uye kuderedzwa. chisungo simba, zvichikonzera makatsemuka, Quality matambudziko akadai hollowing uye peeling. Kuvandudza kuchengetwa kwemvura kwezvinhu zvekuvaka zvegypsum zvinogona kuvandudza kunaka kwekuvaka uye simba rekubatanidza nemadziro. Naizvozvo, mumiriri wekuchengetedza mvura yave imwe yeakakosha musanganiswa wegypsum zvekuvaka zvinhu.

Iyo inowanzoshandiswa kuchengetedza mvura munyika yangu ndeye carboxymethyl cellulose uye methyl cellulose. Aya maviri ekuchengetedza mvura maajenti eether anobva ku cellulose. Vese vane basa repamusoro, uye kune hydrophilic uye hydrophobic mapoka mumamorekuru avo, ane emulsification, inodzivirira colloid uye kugadzikana kwechikamu. Nekuda kweiyo viscosity yakakwira yeaqueous solution, kana ichinge yawedzerwa mudhaka kuti ichengetedze huwandu hwemvura, inogona kudzivirira kunyudza kwakanyanya kwemvura ne substrate (sezvidhinha, kongiri, nezvimwewo) uye kuderedza chiyero chekubuda kwemvura. yemvura, nokudaro ichiita basa rekuchengetedza mvura. Methyl cellulose musanganiswa wakanakira gypsum unobatanidza kuchengetwa kwemvura, kukora, kusimbisa uye kukora, asi mutengo wakanyanya kukwirira. Kazhinji, mumiriri mumwe chete wekuchengetedza mvura haakwanise kuwana iyo yakanaka-yekuchengetedza mvura, uye kusanganiswa kweakasiyana-ekuchengetedza mvura maajenti haagoni kungovandudza mashandisiro ekushandisa, asi zvakare kuderedza mutengo wegypsum-based materials.

Kuchengetwa kwemvura kunobata sei zvimiro zvegypsum composite cementitious zvinhu?

Mhinduro: Nhamba yekuchengetedza mvura inowedzera pamwe nekuwedzerwa kwemethyl cellulose ether muhuwandu hwe 0.05% kusvika 0.4%. Apo huwandu hwekuwedzera hunowedzera kuwedzera, maitiro ekuwedzera kwekuchengetedza mvura akadzikira.