• NEBANNER

ʻO ka hōʻuluʻulu o nā loina o ka koho monomer i ka synthesis o nā resins acrylic

No ka maʻalahi o ka hoʻohana ʻana, hoʻokaʻawale ʻia nā monomer polymeric i ʻekolu mau ʻāpana: nā monomers paʻakikī, nā monomers palupalu a me nā monomers hana.ʻO Methyl methacrylate (MMA), styrene (ST), a me ka acrylic eye (AN) nā monomers paʻakikī i hoʻohana pinepine ʻia, ʻoiai ʻo ethyl acrylate (EA), butyl acrylate (BA), a me isoctyl acrylate (2-EHA) ka mea maʻamau. hoʻohana ʻia nā monomers palupalu.

ʻOi aku ka maikaʻi o ka pale ʻana i ka waiʻona a me ke kūpaʻa wai i ka waika acrylic kaulahao lōʻihi a me nā esters methacrylic (e like me ka lauryl a me ka octadecyl esters).

ʻO nā monomer hana nā acrylates a me nā methacrylates i loaʻa nā pūʻulu hydroxyl, a ʻo nā monomers i loaʻa nā pūʻulu carboxyl he ʻakika acrylic a me ka waikawa methacrylic.Hiki i ka hoʻokomo ʻana o nā pūʻulu hydroxyl ke hāʻawi i nā pūʻulu hana no nā resins i hoʻokumu ʻia me ka polyurethane curing agents a me nā resins amino no ka hoʻopili ʻana.ʻO nā monomers hana ʻē aʻe: acrylamide (AAM), hydroxymethylacrylamide (NMA), diacetone acrylamide (DAAM) a me ka ethyl acetoacetate methacrylate (AAEM), glycidyl methacrylate (GMA), dimethylaminoethyl methacrylate (DMAEMA), vinyl siloxanes (e like me vinylnetrimethoxylsilane vinyl (2-methoxyethoxy) silane, vinyl triisopropoxy silane, γ-methyl propionyloxypropyl trimethoxysilane, γ-methyl propionnyloxypropyl tri(β-trimethoxyethoxy silane) monomer, a pēlā aku. , ʻaʻole nui loa, inā ʻaʻole ia e hoʻopilikia i ka mālama paʻa o ka resin a i ʻole ka pena. i ka hoʻomaikaʻi ʻana i ke kūpaʻa wai o nā emulsions, weathering a me nā waiwai ʻē aʻe, akā ʻoi aku ka kiʻekiʻe o kona kumukūʻai.pono e hoʻohana i ka methacrylate (AAEM) me ka pau ʻana o ka polymerization me hexanediyl dihydrazide, hexanediamine pūhui, hiki ke hoʻoheheʻe ʻia ka wai i loko o ke alahaka kaulahao macromolecular ma waena o ka hoʻokumu ʻana i ke kiʻi ʻoniʻoni keʻa.

ʻO Carboxyl monomer i loaʻa ka waikawa acrylic a me ka methacrylic acid, hiki i ka hoʻokomo ʻana o nā hui carboxyl ke hoʻomaikaʻi i ka resin i ke kala, ka hoʻopiha piha ʻana a me ka hoʻopili ʻana i ka substrate, a me ka hui epoxy ka reactivity, ʻo ka hoʻōla ʻana o nā resins amino he hana catalytic.ʻO ka maʻiʻo carboxyl o ka resin ka mea hoʻohana maʻamau i ka waiwai waika (AV), ʻo ia ka helu o nā milligrams o KOH pono e hoʻokaʻawale i ka resin 1g, ʻāpana mgKOH/g ( resin paʻa), ka mana AV ma kahi o 10mgKOH/g (paʻa. resin), ʻōnaehana polyurethane, AV haʻahaʻa iki, hiki ke ʻoi aku ka nui o ka resin amino me AV, e hoʻoikaika i ka hoʻopili kea.

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I ka synthesizing hydroxy acrylic resin, ʻo ke ʻano a me ka nui o ka hydroxyl monomer he mana koʻikoʻi i ka hana resin.Hoʻohana mau ʻia ka ʻāpana hydroxy acrylic acid o ka ʻōnaehana polyurethane ʻelua ʻāpana ma ke ʻano he hydroxyl monomer: hydroxyethyl acrylate (HEA) a i ʻole hydroxyethyl methacrylate (HEMA);hoʻohana mau ʻia ka mea hydroxy acrylic acid o ka amino baking paint ma ke ʻano he lua hydroxyl monomer: acrylic acid-β-hydroxypropyl ester (HPA) a i ʻole methacrylic acid-β-hydroxypropyl ester (HPMA).ʻOi aku ka kiʻekiʻe o ka hana o ka monomer, a ʻo ka hydroxypropyl resin synthesized e ia i hoʻohana ʻia e like me ka mea hydroxyl o ka lacquer baking amino, e pili ana i ka mālama ʻana o ka lacquer, hiki ke
koho i ka lua hydroxypropyl monomer.I nā makahiki i hala iho nei, aia kekahi mau hydroxyl monomers hou, e like me ka waikawa acrylic a i ʻole hydroxybutyl methacrylate, hydroxyethyl methacrylate a me ka hoʻohui ε-caprolactone (1:1 a i ʻole 1:2 mol ratio, Dow Chem Company).ʻO nā resins synthesized e ka hoʻohui ʻana o ka hydroxyethyl methacrylate a me ka ε-caprolactone he haʻahaʻa haʻahaʻa haʻahaʻa, a hiki ke loaʻa kahi kaulike maikaʻi o ka paʻakikī a me ka maʻalahi.Eia kekahi, ʻo ka hoʻokomo ʻana i nā pūʻulu hydroxyl ma ka hope o ke kaulahao macromolecular e nā mea hoʻoili kaulahao hydroxyl-type chain transfer agents (e like me mercaptoethanol, mercaptopropanol, a me 2-hydroxyethyl mercaptopropionate) e hoʻomaikaʻi i ka hāʻawi ʻana i nā pūʻulu hydroxyl, hoʻonui i ka paʻakikī, a hōʻemi i ka molekala. ka mahele kaumaha, e hoemi ana i ka viscosity o ka pūnaewele.

No ka hoʻomaikaʻi ʻana i ke kūpaʻa ethanol e hoʻokomo i ka styrene, acrylate a me ka methacrylic acid advanced alkyl esters e hōʻemi i ka ʻike o ka hui ester.Hiki ke noʻonoʻo ʻia nā mea ʻelua e kaulike i ka weatherability a me ka ethanol resistance.ʻO ka methacrylic acid advanced alkyl esters he lauryl methacrylate, octadecyl methacrylate, etc., hilinaʻi nui kēia mau monomers i nā mea lawe mai.

ʻO nā resins C no ka uhi ʻana he mau copolymers, a pono e noʻonoʻo ʻia kā lākou hana copolymerization i ke koho ʻana i nā monomers.Ma muli o ke ʻano monomer ʻokoʻa, ʻokoʻa ka hana copolymerization, ʻokoʻa ka haku mele ʻana me ka hui ʻana o ka monomer, no ka binary, terpolymerization, hiki ke hoʻopili ʻia lākou ma o ka hoʻohālikelike ʻana i ka copolymer.No nā copolymers ʻokoʻa, ʻaʻohe hoʻohālikelike hoʻohālikelike maikaʻi i loaʻa, ma o nā haʻawina hoʻokolohua wale nō, ka loiloi kikoʻī o nā pilikia kikoʻī.Ma ka hoʻomaʻamaʻa ʻana, hoʻohana ʻia ke ʻano hānai ʻai monomer "pōloli" (ʻo ia hoʻi, ka helu hānai monomer < copolymerization rate) hoʻohana maʻamau e hoʻomalu i ka haku ʻana i ka copolymer.I mea e hana ai i ka copolymerization smoothly, copolymerization me ka hui o ka monomer polymerization rate pono ole e okoa loa, e like me styrene me vinyl acetate, vinyl chloride, propylene maka paʻakikī e copolymerize.Pono e copolymerized me ka ʻokoʻa nui i ka monomer hana, hiki iā ʻoe ke hoʻohui i kahi monomer no ka hoʻololi ʻana, ʻo ia hoʻi, e hoʻohui i kahi monomer, a ʻo ka monomer me nā mea ʻē aʻe monomer polymerization rate he pili kokoke i ka copolymerization o ka maikaʻi, styrene a me acrylate paʻakikī e copolymerize, hoʻohui i ka monomer acrylate hiki ke hoʻomaikaʻi i kā lākou copolymerization.

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Unuhi ʻia me www.DeepL.com/Translator (mana manuahi)
Inā ʻaʻohe waiwai o ka helu polymerization, hiki ke hoʻohana ʻia ka Q a me ka waiwai o ka monomer e helu i ka helu polymerization, a i ʻole e hoʻohana pololei iā Q a me e no ka loiloi wale ʻana i ka hana copolymerization, ʻaʻole hiki ke ʻokoʻa loa ka waiwai copolymerization monomer Q. a i ʻole, paʻakikī ke hoʻopaʻa ʻana i ka copolymerize;ke ʻokoʻa ka waiwai e, maʻalahi ka hoʻololi ʻana i ka copolymerization, ʻo kekahi paʻakikī ke kope i ka monomer ma ka hoʻohui ʻana i ka waiwai Q waena o ka monomer, hiki ke hoʻomaikaʻi i ka hana copolymerization.

Pono e hoʻolohe pono ke koho ʻana i ka monomer i ka nui o ka mea ʻawaʻawa monomer, ʻoi aku ka nui o ka ʻona o ka acrylate ma mua o ka ʻona o ka methacrylate e pili ana, e like me ka methyl acrylate toxicity ʻoi aku ka nui ma mua o ka toxicity o ka methyl methacrylate, me ka hoʻohui ʻana i ka toxicity o ka ethyl acrylate. ʻoi aku ka nui.

Unuhi ʻia me www.DeepL.com/Translator (mana manuahi)

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Ka manawa hoʻouna: ʻAukake-22-2021