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Takaitacciyar ka'idodin zaɓin monomer a cikin haɗin resin acrylic

Domin sauƙi na aikace-aikace, polymeric monomers yawanci kasu uku main Categories: tukuru monomers, taushi da monomers da kuma aikin monomers.Methyl methacrylate (MMA), styrene (ST), da kuma acrylic ido (AN) su ne mafi yawan amfani da hard monomers, yayin da ethyl acrylate (EA), butyl acrylate (BA), da isooctyl acrylate (2-EHA) su ne mafi yawan amfani. amfani da taushi monomers.

Dogon sarkar acrylic acid da methacrylic esters (kamar lauryl da octadecyl esters) suna da mafi kyawun juriyar barasa da juriya na ruwa.

Monomers masu aiki sune acrylates da methacrylates dauke da kungiyoyin hydroxyl, kuma monomers dauke da kungiyoyin carboxyl sune acrylic acid da methacrylic acid.Gabatarwar ƙungiyoyin hydroxyl na iya samar da ƙungiyoyi masu aiki don resins na tushen ƙarfi tare da magungunan polyurethane da kuma resin amino don haɗin giciye.Sauran monomers masu aiki sune: acrylamide (AAM), hydroxymethylacrylamide (NMA), diacetone acrylamide (DAAM) da ethyl acetoacetate methacrylate (AAEM), glycidyl methacrylate (GMA), dimethylaminoethyl methacrylate (DMAEMA), vinyl siloxananeth astrivinsilyloxystrivinsileth astrivinsilyloxy, trivinsilyloxy, trivinsilyloxystrivinsil. (2-methoxyethoxy) silane, vinyl triisopropoxy silane, γ-methyl propionyloxypropyl trimethoxysilane, γ-methyl propionyloxypropyl tri(β-trimethoxyethoxy silane) monomer, da dai sauransu Yawan aiki monomer ne gaba ɗaya sarrafawa a 1% ~ 6% (mass rabo) , ba da yawa ba, in ba haka ba yana iya rinjayar kwanciyar hankali na resin ko fenti. Vinyl triisopropoxysilane monomer saboda isopropyl site-blocking effects, Si-O bond hydrolysis a hankali, za a iya ƙara adadin zuwa 10% a cikin emulsion polymerization, wanda yake da kyau. don inganta juriya na ruwa na emulsion, weathering da sauran kaddarorin, amma farashinsa ya fi girma.ci methacrylate (AAEM) yana buƙatar amfani da ƙarshen polymerization tare da hexanediyl dihydrazide, hexanediamine fili, evaporation na ruwa na iya zama a cikin gada sarkar macromolecular tsakanin samuwar giciye-linked fim.

Carboxyl monomer dauke da acrylic acid da methacrylic acid, gabatarwar carboxyl kungiyoyin iya inganta guduro zuwa launi, filler wettability da adhesion zuwa substrate, kuma tare da epoxy kungiyar yana da reactivity, da curing na amino resins da catalytic aiki.Abubuwan da ke cikin carboxyl na guduro yawanci ana amfani da ƙimar acid (AV), wato, adadin milligrams na KOH da ake buƙata don kawar da guduro 1g, naúrar mgKOH/g (guro mai ƙarfi), babban iko na AV a kusan 10mgKOH/g (m guduro), tsarin polyurethane, AV ɗan ƙasa kaɗan, resin amino tare da AV na iya zama babba, don haɓaka haɗin giciye.

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Lokacin da ake haɗa resin hydroxy acrylic, nau'in da adadin hydroxyl monomer suna da tasiri mai mahimmanci akan aikin guduro.Ana amfani da bangaren hydroxy acrylic acid na tsarin polyurethane guda biyu a matsayin babban hydroxyl monomer: hydroxyethyl acrylate (HEA) ko hydroxyethyl methacrylate (HEMA);sinadarin hydroxy acrylic acid na amino baking fenti ana amfani dashi azaman na biyu na hydroxyl monomer: acrylic acid-β-hydroxypropyl ester (HPA) ko methacrylic acid-β-hydroxypropyl ester (HPMA).Ayyukan monomer ya fi girma, kuma resin hydroxypropyl da aka haɗa ta ana amfani da shi azaman ɓangaren hydroxyl na amino baking lacquer, wanda ke shafar ajiyar lacquer, zai iya.
zabi na biyu hydroxypropyl monomer.A cikin 'yan shekarun nan, akwai wasu sababbin hydroxyl monomers, irin su acrylic acid ko hydroxybutyl methacrylate, hydroxyethyl methacrylate da ε-caprolactone ƙari (1: 1 ko 1: 2 mol rabo, Dow Chem Company).Abubuwan resin da aka haɗa ta hanyar ƙari na hydroxyethyl methacrylate da ε-caprolactone suna da ƙananan danko, kuma ana iya samun ma'auni mai kyau na taurin da sassauci.Bugu da ƙari, ƙaddamar da ƙungiyoyin hydroxyl a ƙarshen sarkar macromolecular ta hanyar nau'in nau'in nau'in nau'in nau'in hydroxyl (irin su mercaptoethanol, mercaptopropanol, da 2-hydroxyethyl mercaptopropionate) yana inganta rarraba ƙungiyoyin hydroxyl, yana ƙaruwa da taurin, kuma yana rage yawan kwayoyin halitta. rarraba nauyi, rage danko na tsarin.

Don haɓaka juriya na ethanol don gabatar da styrene, acrylate da methacrylic acid ci-gaba alkyl esters don rage abun ciki na ƙungiyar ester.Dukansu ana iya la'akari da su don daidaita yanayin yanayi da juriya na ethanol.Methacrylic acid Advanced alkyl esters sune lauryl methacrylate, octadecyl methacrylate, da sauransu, waɗannan monomers galibi sun dogara akan shigo da kaya.

C resins don sutura sau da yawa copolymers ne, kuma dole ne a yi la'akari da ayyukan haɗin gwiwar su yayin zabar monomers.Saboda daban-daban monomer tsarin, copolymerization aiki ne daban-daban, copolymer abun da ke ciki tare da monomer abun da ke ciki yawanci daban-daban, ga binary, terpolymerization, su za a iya alaka ta hanyar copolymer abun da ke ciki equation.Don ƙarin nau'ikan copolymers, babu ingantaccen daidaiton daidaituwa da ake samu, kawai ta hanyar nazarin gwaji, takamaiman bincike na takamaiman matsaloli.A aikace, hanyar ciyar da cakuda monomer "yunwa" (watau adadin ciyarwar monomer

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Fassara da www.DeepL.com/Translator (sigar kyauta)
Idan babu darajar ƙimar polymerization, ƙimar Q da e na monomer za a iya amfani da su don ƙididdige ƙimar polymerization, ko amfani da Q da e kai tsaye don kimanta ayyukan copolymerization kawai, ƙimar monomer Q na gabaɗaya copolymerization ba zai iya bambanta sosai ba. in ba haka ba yana da wuya a yi copolymerize;lokacin da darajar e ta bambanta, yana da sauƙi a canza tsarin haɗin gwiwa, wasu masu wuyar haɗawa monomer ta ƙara matsakaicin Q darajar monomer, na iya inganta aikin copolymerization.

Zaɓin zaɓi na monomer ya kamata kuma kula da girman ƙwayar ƙwayar cuta ta monomer, ƙwayar acrylate na gabaɗaya ya fi girma fiye da guba na methacrylate mai dacewa, irin su methyl acrylate toxicity ya fi girma fiye da guba na methyl methacrylate, ban da ethyl acrylate mai guba. shi ma ya fi girma.

Fassara da www.DeepL.com/Translator (sigar kyauta)

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Lokacin aikawa: Agusta-22-2021