Rau kev yooj yim ntawm daim ntawv thov, polymeric monomers feem ntau muab faib ua peb pawg tseem ceeb: nyuaj monomers, mos monomers thiab functional monomers.Methyl methacrylate (MMA), styrene (ST), thiab acrylic qhov muag (AN) yog cov feem ntau siv nyuaj monomers, thaum ethyl acrylate (EA), butyl acrylate (BA), thiab isooctyl acrylate (2-EHA) yog cov feem ntau. siv cov mos mos monomers.
Cov saw ntev acrylic acid thiab methacrylic esters (xws li lauryl thiab octadecyl esters) muaj cawv zoo dua thiab dej tsis kam.
Functional monomers yog acrylates thiab methacrylates uas muaj pawg hydroxyl, thiab cov monomers uas muaj carboxyl pawg yog acrylic acid thiab methacrylic acid.Kev taw qhia ntawm cov pab pawg hydroxyl tuaj yeem muab cov pab pawg ua haujlwm rau cov kuab tshuaj raws li cov khoom siv nrog polyurethane curing agents thiab amino resins rau kev sib txuas.Lwm yam kev ua haujlwm yog: Acrylamide (Aam), Hydroxymethylas (a iethoxysilane vinyl tri (2-methoxyethoxy) silane, vinyl triisopropoxy silane, γ-methyl propionyloxypropyl trimethoxysilane, γ-methyl propionyloxypropyl tri (β-trimethoxyethoxy silane) monomer, thiab lwm yam. Tus nqi ntawm kev ua haujlwm monomer feem ntau tswj ntawm 1% ~ 6% (mass ratio) Vinyl triisopropoxysilane monomer vim yog isopropyl site-blocking nyhuv, Si-O daim ntawv cog lus hydrolysis qeeb, tus nqi yuav nce mus rau 10% nyob rau hauv emulsion polymerization, uas yog conducive. los txhim kho cov dej tsis kam ntawm emulsions, huab cua thiab lwm yam khoom, tab sis nws cov nqi yog siab dua emulsion polymerization monomer, diacetone acrylamide (DAAM), ethyl acetoacetate methacrylate (AAEM) yuav tsum tau siv nrog qhov kawg ntawm polymerization ntxiv rau hexanediyl dihydrazide, hexanediamine compound. , dej evaporation tuaj yeem nyob rau hauv macromolecular saw txuas ntawm kev tsim cov yeeb yaj kiab sib txuas.
Carboxyl monomer uas muaj acrylic acid thiab methacrylic acid, kev taw qhia ntawm carboxyl pawg tuaj yeem txhim kho cov resin rau xim, muab tub lim wettability thiab adhesion rau cov substrate, thiab nrog cov epoxy pawg muaj cov reactivity, kho cov amino resins muaj catalytic.Cov ntsiab lus carboxyl ntawm cov resin feem ntau yog siv cov kua qaub (AV), uas yog, tus naj npawb ntawm milligrams ntawm KOH yuav tsum tau ua kom tsis muaj zog 1g resin, chav tsev mgKOH / g (khoom resin), AV tswj ntawm txog 10mgKOH / g (khoom khov. resin), polyurethane system, AV qis me ntsis, amino resin nrog AV tuaj yeem loj dua, los txhawb kev sib txuas.
Thaum synthesizing hydroxy acrylic resin, hom thiab tus nqi ntawm hydroxyl monomer muaj ib qho tseem ceeb ntawm kev ua haujlwm ntawm resin.Cov hydroxy acrylic acid tivthaiv ntawm ob lub ntsiab lus polyurethane feem ntau yog siv los ua thawj hydroxyl monomer: hydroxyethyl acrylate (HEA) lossis hydroxyethyl methacrylate (HEMA);cov hydroxy acrylic acid tivthaiv ntawm amino ci xim yog feem ntau siv raws li ib tug thib ob hydroxyl monomer: acrylic acid-β-hydroxypropyl ester (HPA) los yog methacrylic acid-β-hydroxypropyl ester (HPMA).Cov kev ua ntawm cov monomer yog siab dua, thiab hydroxypropyl resin synthesized los ntawm nws yog siv los ua hydroxyl tivthaiv ntawm cov amino ci lacquer, uas cuam tshuam rau kev khaws cia ntawm lacquer, tuaj yeem ua rau lub cev muaj zog.
xaiv qhov thib ob hydroxypropyl monomer.Nyob rau hauv xyoo tas los no, muaj qee cov hydroxyl monomers tshiab, xws li acrylic acid lossis hydroxybutyl methacrylate, hydroxyethyl methacrylate thiab ε-caprolactone ntxiv (1: 1 lossis 1: 2 mol piv, Dow Chem Company).Cov resins synthesized los ntawm kev sib ntxiv ntawm hydroxyethyl methacrylate thiab ε-caprolactone muaj qis viscosity, thiab qhov zoo sib npaug ntawm hardness thiab saj zawg zog tuaj yeem ua tiav.Tsis tas li ntawd, kev qhia txog cov pab pawg hydroxyl thaum kawg ntawm cov saw hlau macromolecular los ntawm hydroxyl-hom saw hloov cov neeg ua haujlwm (xws li mercaptoethanol, mercaptopropanol, thiab 2-hydroxyethyl mercaptopropionate) txhim kho kev faib tawm ntawm pawg hydroxyl, nce hardness, thiab nqaim cov molecular. hnyav faib, txo cov viscosity ntawm lub cev.
Txhawm rau txhim kho ethanol tsis kam los qhia styrene, acrylate thiab methacrylic acid advanced alkyl esters los txo cov ester pawg ntsiab lus.Ob leeg tuaj yeem txiav txim siab kom sib npaug ntawm huab cua thiab ethanol tsis kam.Methacrylic acid advanced alkyl esters yog lauryl methacrylate, octadecyl methacrylate, thiab lwm yam., cov monomers no tsuas yog vam khom rau kev xa khoom.
C resins rau txheej yog feem ntau copolymers, thiab lawv cov copolymerization yuav tsum tau txiav txim siab thaum xaiv monomers.Vim muaj cov qauv monomer sib txawv, kev ua haujlwm copolymerization txawv, copolymer muaj pes tsawg leeg nrog monomer sib xyaw muaj pes tsawg leeg feem ntau sib txawv, rau binary, terpolymerization, lawv tuaj yeem cuam tshuam los ntawm kev sib npaug copolymer.Rau ntau hom copolymers, tsis muaj kev sib raug zoo sib luag muaj, tsuas yog los ntawm kev sim kev tshawb fawb, kev tshuaj xyuas tshwj xeeb ntawm cov teeb meem tshwj xeeb.Hauv kev xyaum, monomer sib tov "kev tshaib kev nqhis" kev pub mis (piv txwv li kev pub noj monomer < copolymerization tus nqi) feem ntau yog siv los tswj cov copolymer muaj pes tsawg leeg.Txhawm rau ua kom copolymerization smoothly, copolymerization nrog kev sib xyaw ntawm monomer polymerization tus nqi yuav tsum tsis txhob sib txawv heev, xws li styrene nrog vinyl acetate, vinyl chloride, propylene qhov muag nyuaj rau copolymerize.Yuav tsum tau copolymerized nrog qhov sib txawv loj hauv kev ua haujlwm monomer, koj tuaj yeem ntxiv ib qho monomer rau kev hloov pauv, uas yog, ntxiv monomer, thiab cov monomer nrog rau lwm cov monomer polymerization tus nqi yog ze rau copolymerization ntawm zoo, styrene thiab acrylate yog nyuaj rau. copolymerize, ntxiv acrylate monomer tuaj yeem txhim kho lawv cov copolymerization.
Txhais nrog www.DeepL.com/Translator (dawb version)
Yog tias tsis muaj tus nqi ntawm polymerization tus nqi, Q thiab e tus nqi ntawm monomer tuaj yeem siv los laij cov polymerization tus nqi, lossis ncaj qha siv Q thiab e los ntsuas qhov kev ua haujlwm ntawm copolymerization, qhov dav dav copolymerization monomer Q tus nqi tsis tuaj yeem txawv dhau, txwv tsis pub nws yog qhov nyuaj rau copolymerize;thaum tus nqi e sib txawv, nws yog ib qho yooj yim rau alternate copolymerization, ib co nyuaj rau copolymerize monomer los ntawm kev ntxiv intermediate Q tus nqi ntawm monomer, tuaj yeem txhim kho qhov kev ua tau zoo ntawm copolymerization.
Kev xaiv Monomer yuav tsum tau them sai sai rau qhov loj ntawm monomer toxicity, qhov dav acrylate toxicity ntau dua li cov tshuaj lom ntawm cov tshuaj methacrylate, xws li methyl acrylate toxicity ntau dua li cov tshuaj lom ntawm methyl methacrylate, ntxiv rau cov tshuaj lom ntawm ethyl acrylate. kuj loj dua.
Txhais nrog www.DeepL.com/Translator (dawb version)
Post lub sij hawm: Aug-22-2021