Dispersants yog cov additives saum npoo siv los ua kom cov khoom ruaj khov hauv cov xov xwm xws li cov nplaum, xim, cov yas thiab cov yas sib xyaw.

Yav dhau los, coatings yeej tsis xav tau dispersants. Cov txheej txheem xws li alkyd thiab nitro xim tsis xav tau cov khoom tawg. Dispersants tsis tshwm sim kom txog thaum acrylic resin xim thiab polyester resin xim. Qhov no kuj tseem cuam tshuam nrog kev txhim kho cov xim pigments, vim tias daim ntawv thov ntawm high-end pigments tsis tuaj yeem sib cais los ntawm kev pab ntawm dispersants.
Dispersants yog cov additives saum npoo siv los ua kom cov khoom ruaj khov hauv cov xov xwm xws li cov nplaum, xim, cov yas thiab cov yas sib xyaw. Ib qho kawg ntawm nws yog ib qho kev daws teeb meem uas tuaj yeem yaj nyob rau hauv ntau yam kev tawm suab, thiab lwm qhov kawg yog cov pigment anchoring pawg uas tuaj yeem adsorbed rau ntawm ntau yam xim thiab siv los hloov mus rau hauv cov khoom / kua sib txuas (pigment / resin tov).

Cov tshuaj resin yuav tsum nkag mus rau qhov chaw nruab nrab ntawm cov xim agglomerate. Tag nrho cov pigments muaj xws li pigment agglomerates, uas yog "sau" ntawm cov xim pigment, nrog huab cua thiab noo noo nyob rau hauv qhov chaw sab hauv nruab nrab ntawm tus neeg pigment hais. Cov khoom yog nyob rau hauv kev sib cuag nrog ib leeg ntawm cov npoo thiab cov ces kaum, thiab kev sib cuam tshuam ntawm cov khoom me me, yog li cov quab yuam no tuaj yeem kov yeej los ntawm cov cuab yeej dispersion zoo tib yam. Ntawm qhov tod tes, cov aggregates yog ntau compact, thiab muaj kev sib cuag ntawm lub ntsej muag ntawm tus neeg pigment hais, yog li nws yog qhov nyuaj dua rau disperse lawv mus rau hauv thawj particles. Thaum lub sij hawm cov xim dispersion sib tsoo cov txheej txheem, cov xim agglomerate maj mam ua me; Qhov xwm txheej zoo tshaj plaws yog kom tau txais cov khoom tseem ceeb.

Cov txheej txheem pigment sib tsoo tuaj yeem muab faib ua peb kauj ruam hauv qab no: thawj kauj ruam yog ntub dej. Nyob rau hauv stirring, tag nrho cov huab cua thiab noo noo nyob rau saum npoo ntawm cov xim raug tshem tawm thiab hloov los ntawm resin tov. Lub dispersant txhim kho lub wettability ntawm cov xim, tig cov khoom / roj interface rau hauv cov khoom / kua interface thiab txhim kho kev sib tsoo efficiency; cov kauj ruam thib ob yog qhov tseeb pigment dispersion sib tsoo txheej txheem. Los ntawm cov khoom siv hluav taws xob cuam tshuam thiab lub zog shear, cov xim agglomerates tawg thiab cov particle loj yog txo mus rau thawj cov khoom. Thaum cov xim qhib los ntawm cov neeg kho tshuab quab yuam, cov dispersant yuav sai sai adsorb thiab qhwv cov khoom me me me me; nyob rau hauv lub thib peb kauj ruam kawg, cov xim dispersion yuav tsum ruaj khov txaus los tiv thaiv kev tsim ntawm uncontrolled flocculation.

Kev siv cov dispersant tsim nyog tuaj yeem khaws cov xim xim ntawm qhov sib nrug ntawm ib leeg yam tsis muaj kev sib cuag. Hauv ntau daim ntawv thov, lub xeev ruaj khov deflocculated yog xav tau. Hauv qee qhov kev siv, cov xim dispersion tuaj yeem nyob ruaj khov raws li kev tswj hwm coflocculation. Wetting aids tuaj yeem txo qhov sib txawv ntawm qhov sib txawv ntawm cov xim thiab cov tshuaj resin, ua kom cov dej ntub dej ntawm cov xim agglomerates los ntawm cov resin; dispersing pab txhim khu kev ruaj ntseg ntawm cov xim dispersion. Yog li ntawd, tib yam khoom feem ntau muaj kev ua haujlwm ntawm ob qho tib si ntub dej thiab dispersing pab.

Pigment dispersion yog txheej txheem los ntawm aggregate mus rau lub xeev dispersed. Raws li qhov loj me me zuj zus thiab thaj chaw saum npoo nce, lub zog saum npoo ntawm lub cev kuj nce ntxiv.
Txij li thaum lub zog saum npoo ntawm lub cev yog ib qho kev txo qis ntawm tus kheej, qhov pom tseeb ntawm qhov nce hauv cheeb tsam, qhov ntau lub zog yuav tsum tau siv los ntawm sab nraud thaum lub sij hawm sib tsoo, thiab qhov muaj zog stabilizing nyhuv ntawm cov dispersant yuav tsum tau ua kom lub dispersion stability ntawm lub system. Feem ntau, inorganic pigments muaj qhov loj me me, qis dua qhov chaw ntawm qhov chaw, thiab cov polarity siab dua, yog li lawv yooj yim rau kev tawg thiab ruaj khov; Txawm hais tias muaj ntau yam organic pigments thiab carbon dub muaj qhov me me me me, qhov loj dua qhov chaw ntawm qhov chaw, thiab cov polarity qis dua, yog li nws nyuaj rau kev tawg thiab ruaj khov.

Yog li ntawd, dispersants feem ntau muab peb yam ntawm kev ua tau zoo: (1) txhim kho pigment wetting thiab txhim kho kev sib tsoo efficiency; (2) txo viscosity thiab txhim kho kev sib raug zoo nrog cov khoom siv hauv paus, txhim kho gloss, puv thiab sib txawv ntawm cov duab, thiab txhim kho kev ruaj ntseg cia; (3) ua kom cov xim tinting zog thiab cov xim xim thiab txhim kho xim tinting stability.

Nanjing Reborn New Materials muabwetting dispersant tus neeg sawv cev rau cov xim thiab coatings, suav nrog qee qhov uas phim Disperbyk.

In lwm tsab xov xwm, peb yuav tshawb nrhiav hom dispersants nyob rau hauv ntau lub sij hawm nrog rau kev loj hlob keeb kwm ntawm dispersants.