Menene polycarboxylate ether PCE foda?

(Mene ne polycarboxylate ether PCE foda?)

Abubuwan haɗin sinadarai suna cikin buƙatu mai yawa a cikin fasahar kankare don haɓaka kaddarorin su kamar karko, ruwa, saiti da kaddarorin inji. Daga cikin waɗannan abubuwan haɗaɗɗun sinadarai, ana amfani da superplasticizers galibi don haɓaka haɓakar ruwa a ƙananan ƙimar siminti (W/C). Nafila na ƙarni na farko (SP) irin su naphthalene formaldehyde condensate sulfonated (SNF) da sulfamic acid formaldehyde condensate (ASF) na iya tarwatsa barbashi siminti ta hanyar injin tarwatsewa na electrostatic. Wani sabon ƙarni na SP yana dogara ne akan polycarboxylate ether comb copolymers tare da ƙungiyoyin carboxyl da poly (ethylene oxide) (PEO). PCE copolymers na iya haifar da tsangwama na electrostatic da tsangwama, sabili da haka, suna samar da kyakkyawan aiki fiye da tsofaffin tsarawa. Nauyin kwayoyin halitta da tsayin sarkar gefen PCE ana iya keɓance shi cikin sauƙi don sa ya fi sauran nau'ikan SP.

Free radical polymerization (FRP) ana amfani da ko'ina don shirya PCE copolymers, amma yana da kasa iko a kan kwayoyin nauyi da kuma kwayoyin nauyi rarraba (ko da tare da sarkar canja wurin jamiái don sarrafa polydispersity index D = Mw / Mn dabi'u yawanci ya fi 1.5 molar taro) , samar da polymer sarƙoƙi tare da m molar taro rarraba da m bambance-bambancen karatu tare da daban-daban sinadaran. A cikin shekaru ashirin da suka gabata, fasahar polymerization mai sarrafawa da aka haɓaka ta zama wata hanya ta gabaɗaya wacce ke ba da haɗin kai na polymers kyauta tare da ƙayyadaddun ma'aunin ƙwayoyin ƙwayoyin cuta da ƙunƙuntaccen tarwatsewar molar. Canja wurin sarkar juzu'i mai jujjuyawa (RAFT) polymerization shine dabarar polymerization mai sarrafawa/rayuwa wacce ta dace da nau'ikan monomers iri-iri. Ƙananan karatu ne kawai suka yi amfani da RAFT polymerization don shirya PCE superplasticizers, mayar da hankali kan toshe copolymers watsi da yuwuwar aikace-aikace a PCE bazuwar copolymers.

Don samun cikakkiyar fahimta game da tasirin tsayin sarkar gefe da cajin kaddarorin akan halayen tallan PCE, mun yi amfani da RAFT polymerization a cikin wannan aikin don samun ingantattun copolymers tare da sarƙoƙi na gefe daban-daban da ayyuka, yana ba da damar ƙarin ƙima na tsarin tsarin sigogi na PCE. Ayyuka. Wannan shine binciken farko don bayar da rahoto game da amfani da ma'anar copolymers mai kyau (D <1.3) don kwatanta tasirin tsayin sarkar gefe da nau'in cajin PCE akan rarrabuwa na manna siminti. A cikin wannan binciken, copolymers guda biyu dauke da COO - ko SO 3 - azaman nau'ikan caji (PCE da PSE, bi da bi) an haɗa su don bincika tasirin takamaiman ƙungiyoyin da aka caje mara kyau akan adsorption da kaddarorin rheological na manna siminti. tasiri. A gefe guda, game da masu amfani da PCE, an yi amfani da tsayin sarkar gefe guda uku daban-daban na PEO don nazarin tasirin su akan ruwan siminti. Nazarin adsorption, ma'auni mai yuwuwar zeta, motsi da kaddarorin rheological kuma an bincika su a cikin wannan aikin.

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Idan kuna neman babban ingancin foda na PCE, don Allah jin daɗin tuntuɓar mu kuma ku aiko da tambaya.

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(Mene ne polycarboxylate ether PCE foda?)