Txheej txheej txheej txheem

Txheej txheej txheej txheem tuaj yeem muab faib ua yaj coalescence los ua cov txheej txheem txheej txheej peb theem.

Nyob rau ntawm qhov muab kub, kev tswj molten coalescence tus nqi yog qhov tseem ceeb tshaj plaws yog lub melting point ntawm resin, viscosity ntawm lub xeev molten ntawm cov hmoov hais thiab qhov loj ntawm cov hmoov hais. Txhawm rau kom qhov zoo tshaj plaws coalescence ntawm molten yuav tsum tau sai li sai tau, thiaj li yuav muaj sij hawm ntev los ua kom tiav cov theem theem ntws los. Kev siv cov tshuaj tua kab ua kom luv luv muaj nyob rau hauv ntws thiab theem ntawm lub sijhawm xav tau, thiab yog li txheej txheej zaj duab xis tsim los ntawm cov hmoov nplej uas muaj zog heev feem ntau nthuav tawm cov txiv kab ntxwv tev.

Cov yam tseem ceeb uas cuam tshuam rau cov txheej txheej ntws thiab qib yog yaj viscosity ntawm cov resin, qhov nro ntawm qhov system thiab zaj duab xis thickness. Nyob rau hauv lem, lub yaj viscosity, tshwj xeeb tshaj yog nyob ntawm qhov kub thiab txias, qhov curing npaum li cas thiab cov cua kub npaum li cas.

Cov ntau yam uas tau hais los saum toj no, ua ke nrog cov particle loj tis thiab cov yeeb yaj kiab thickness, feem ntau yog txiav txim siab los ntawm cov khoom siv zaj duab xis uas yuav tsum tau pleev xim rau cov khoom siv thiab cov hmoov siv los txiav txim siab. Hmoov txheej ntws thiab theem ntawm lub zog los ntawm qhov nro ntawm qhov system, lub hauv ntej no kuj tau hais. Lub zog nrog siv rau kev nyiam ntawm cov molecules hauv cov yeeb yaj kiab txheej ntawm qhov tsis sib xws, qhov tshwm sim, xws li yaj viscosity siab dua, qhov ntau dua qhov kev tawm tsam tawm tsam thiab theem. Yog li, nto muaj qhov nro, thiab molecular loj ntawm qhov sib txawv ntawm lub gravitational txiav txim siab txog qhov ntawm txheej zaj yeeb yaj kiab leveling.

Rau ib txheej nrog zoo flowability, nws yog ib qhov tseeb hais tias lub nto nro ntawm lub system yuav tsum siab npaum li sai tau, thiab cov yaj viscosity yog tsawg li tsawg tau. Cov no tuaj yeem ua tiav los ntawm kev ntxiv cov additives rau qhov nro ntawm qhov system tuaj yeem txhim kho thiab siv qhov qis melting point ntawm cov resin ntawm qhov hnyav molecular.

Txheej-forming txheej txheem

Cov txheej txheem tuaj yeem npaj tau raws li cov xwm txheej saum toj no uas muaj cov khoom ntws zoo heev, tab sis vim nws qhov siab ntawm qhov nro ua rau lub shrinkage, vim qhov qis qis viscosity yuav tsim sagging, thiab cov ces kaum tsis zoo coatability. Nyob rau hauv kev ua hauj lwm, qhov nro thiab yaj viscosity ntawm lub system yog tswj nyob rau hauv ib tug tshwj xeeb ntau yam, yog li tsim nyog txheej txheej yuav tau txais.

Qhov cuam tshuam ntawm qhov nro thiab yaj viscosity ntawm qhov ntws ntawm txheej zaj duab xis yog pom nyob rau hauv daim duab 2. Raws li tuaj yeem pom hauv daim duab, qhov nro ntawm qhov qis dhau los yog siab dhau ntawm cov viscosity yaj yuav tiv thaiv cov txheej ntws, ua rau txheej zaj duab xis tsis zoo flowability, thiab nto nro siab dhau lawm txheej txheem txheej txheem yuav tshwm craters. Lub cev khaws cia ruaj khov ntawm cov yaj viscosity tsawg dhau yuav ua rau cov hmoov deteriorates Poor coatability ntawm lub ces kaum kev tsim kho, thiab kev tsim kho nyob rau hauv lub facade sagging.

Hauv cov ntsiab lus, nws yog qhov tseeb, qhov kawg ntawm qhov chaw ntawm cov hmoov txheej zaj duab xis tau txais, qhov tsis xws luag thiab qhov tsis zoo (xws li cov txiv kab ntxwv tev, cov dej ntws tsis zoo, cov craters, pinholes, thiab lwm yam) muaj kev cuam tshuam zoo sib xws, thiab tseem nyob hauv cov txheej txheem deposition koom nrog. theem hloov hauv rheological quab yuam tswj. Cov hmoov particle loj tis kuj muaj feem xyuam rau lub ntsej muag ntawm lub txheej zaj duab xis. Qhov me me, qhov loj me me ntawm qhov qis vim nws lub peev xwm thermal, yog li nws lub sij hawm melting yog luv dua li ntawm cov khoom loj, coalescents kuj sai dua, thiab zoo dua qhov saum npoo ntawm txheej zaj duab xis yog tsim. Cov hmoov loj me me yaj lub sij hawm ntau dua li qhov ntev ntawm cov khoom me me, cov txheej txheej zaj duab xis ua rau tuaj yeem tsim cov nyhuv txiv kab ntxwv. Electrostatic hmoov txoj kev tsim kho (corona tawm los yog kev sib txhuam tawm), tab sis kuj ua rau muaj qhov tshwm sim ntawm cov txiv kab ntxwv tev.

Yuav ua li cas kom txo tau los yog zam lub txiv kab ntxwv tev nyhuv los txhawb kev ntws thiab theem tuaj yeem txo lossis zam cov txiv kab ntxwv tev. Lub kaw lus siv cov viscosity qis qis, theem ncua sij hawm ntev thiab qhov siab dua ntawm cov txheej txheem kho tuaj yeem txhim kho ntws thiab qib. Qhov tseem ceeb tsis zoo los tswj qhov nro gradient yog txo cov txiv kab ntxwv tev, thaum tseem tswj qhov nro ntawm cov txheej txheej zaj duab xis saum npoo yog sib xws, thiaj li yuav tau txais qhov tsawg tshaj plaws ntawm qhov chaw.

Flow-txhim kho tus neeg saib xyuas lossis tus neeg sawv cev theem feem ntau yog siv rau hauv kev ua haujlwm tiag tiag los txhim kho cov tsos ntawm txheej, txhawm rau tshem tawm qhov tsis xws luag xws li txiv kab ntxwv tev, craters, pinholes. Qhov kev ua tau zoo ntawm tus neeg sawv cev txhawb nqa tuaj yeem txo cov yaj viscosity, yog li ua rau cov yaj sib xyaw thiab cov xim dispersion, txhawm rau txhim kho qhov ntub dej ntawm cov substrate, ntws thiab qib ntawm txheej, pab tshem tawm qhov tsis xws luag thiab ua kom yooj yim rau kev tso pa tawm.

Qhov kev hloov pauv hloov pauv ntau npaum li cas thiab cov txiaj ntsig kev sib raug zoo yuav tsum tau tshawb xyuas. Tsis txaus npaum li cas yuav ua rau shrinkage thiab txiv kab ntxwv tev, kev noj ntau dhau yuav ua rau poob ntawm gloss, haze, thiab ua rau recoat adhesion teeb meem nyob rau sab sauv. Feem ntau, cov dej hloov pauv hauv qhov premix ntxiv. Los yog ua los ntawm ib tug cob master batch (resin thiab additive piv ntawm 9/1 mus rau 8/2), los yog yog adsorbed ntawm inorganic carrier nyob rau hauv hmoov daim ntawv. Tus nqi ntawm cov additives nyob rau hauv cov hmoov xim yog 0.5 mus rau 1.5% (nyob rau hauv Binders xam tau zoo polymer), tab sis nyob rau hauv tsawg concentrations kuj yuav zoo.

Polyacrylate flow modifier resins feem ntau siv, xws li polyacrylic acid butyl ester ("Acronal 4F"), acrylic acid ethyl - ethyl hexyl acrylate copolymer thiab butyl acrylate - acrylic acid-hexyl acrylate copolymer, thiab lwm yam. wide concentration ntau. Feem ntau polyacrylate me ntsis cuam tshuam rau ntawm qhov nro, lawv tuaj yeem ua rau cov txheej txheem tsim ib qho chaw tsis tu ncua. Piv nrog rau cov saum npoo nro txo ​​cov additives (xws li silicone los yog cov zoo li), lawv tsis txo qhov nro saum npoo, thiab yog li ntawd yuav siv tau los ua kom lub leveling. Txo qhov nro ntawm cov khoom siv ntxiv xws li cov neeg ua haujlwm saum npoo av, fluorinated alkyl esters, thiab silicone. Lawv koom tus nqi yog rhiab heev. Benzoin yog ib tug degassing tus neeg sawv cev, kuj muaj cov nyhuv ntawm kev txo cov nto nro, yog dav siv los txhim kho cov nto ntawm cov zaj duab xis txheej ntawm cov hmoov txheej.

Txheej txheej txheej txheem