1. Ibisobanuro n'imikorere yo kubyimba
Inyongeramusaruro zishobora kongera cyane ubwiza bwamabara ashingiye kumazi yitwa umubyimba.
Inkoko zigira uruhare runini mu gukora, kubika no kubaka impuzu.
Igikorwa nyamukuru cyo kubyimba ni ukongera ubwiza bwikibiriti kugirango uhuze ibisabwa mubyiciro bitandukanye byo gukoresha. Ariko, ibishishwa bisabwa no gutwikira mubyiciro bitandukanye biratandukanye. Urugero:
Mugihe cyo kubika, hifujwe kugira ubukonje bwinshi kugirango wirinde pigment gutura;
Mugihe cyubwubatsi, hifujwe kugira ubukonje buciriritse kugirango harebwe ko irangi rifite uburiganya bwiza nta irangi ryinshi;
Nyuma yubwubatsi, hifujwe ko ibishishwa bishobora gusubira vuba mubwiza bwinshi nyuma yigihe gito (inzira yo kuringaniza) kugirango birinde kugabanuka.
Amazi yimyenda yo mumazi ntabwo ari Newtonian.
Iyo ubwiza bwirangi bugabanutse hamwe no kwiyongera kwingufu zogosha, byitwa pseudoplastique, kandi amarangi menshi ni amazi ya pseudoplastique.
Iyo imyitwarire yimyitwarire ya pseudoplastique ifitanye isano namateka yayo, ni ukuvuga, biterwa nigihe, byitwa thixotropic fluid.
Iyo dukora impuzu, akenshi turagerageza kubishaka gukora coixotropic, nko kongeramo inyongeramusaruro.
Iyo thixotropy yikingirizo ikwiye, irashobora gukemura ivuguruzanya ryibyiciro bitandukanye byo gutwikira, kandi igahuza ibyifuzo bya tekiniki yubukorikori butandukanye bwikibiriti mububiko, kuringaniza ubwubatsi, no kumisha.
Ibibyimba bimwe bishobora guha irangi hamwe na thixotropy ndende, kuburyo ifite ubukonje bwinshi kuruhuka cyangwa ku gipimo gito (nko kubika cyangwa gutwara), kugirango birinde pigment iri mu irangi gutura. Kandi munsi yikigereranyo kinini (nkibikorwa byo gutwikira), ifite ubukonje buke, kuburyo igifuniko gifite umuvuduko uhagije no kuringaniza.
Thixotropy igereranwa na thixotropic index TI kandi igapimwa na viscometer ya Brookfield.
TI = ibishishwa (bipimye kuri 6r / min) / ubukonje (bupimwe kuri 60r / min)
2. Ubwoko bwibibyibushye n'ingaruka zabyo muburyo bwo gutwikira
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Ubwoko bwa organic organique burimo bentonite, attapulgite, silikini ya aluminium magnesium, silike ya lithium magnesium, nibindi, ubwoko kama nka methyl selulose, hydroxyethyl selulose, polyacrylate, polymethacrylate, acide acrylic cyangwa methyl Acrylic homopolymer cyangwa copolymer na polyurethane nibindi.
Duhereye ku ngaruka zigira ku miterere ya rheologiya yimyenda, umubyimba ugabanijwemo thixotropic thickensers hamwe na hamwe. Kubijyanye nibikorwa bisabwa, ingano yo kubyimba igomba kuba mike kandi ingaruka zo kubyimba ni nziza; ntabwo byoroshye kurandurwa na enzymes; mugihe ubushyuhe cyangwa pH agaciro ka sisitemu ihindutse, ubwiza bwikibiriti ntibuzagabanuka cyane, kandi pigment nuwuzuza ntibizunguruka. ; Ububiko bwiza; gufata neza amazi, nta kintu gifatika kigaragara kandi nta ngaruka mbi ku mikorere ya firime.
EllCellulose
Umubyimba wa selile ukoreshwa mu gutwikira ni methylcellulose, hydroxyethylcellulose na hydroxypropylmethylcellulose, naho bibiri bya nyuma bikoreshwa cyane.
Hydroxyethyl selulose nigicuruzwa cyabonetse mugusimbuza hydroxyl kumatsinda ya glucose ya selile ya selile naturel hamwe na hydroxyethyl. Ibisobanuro hamwe nicyitegererezo cyibicuruzwa bitandukanijwe cyane cyane ukurikije urwego rwo gusimbuza no kwiyegeranya.
Ubwoko bwa hydroxyethyl selulose nabwo bugabanijwe muburyo busanzwe bwo gusenyuka, ubwoko bwihuta bwihuse nubwoko butajegajega. Kubijyanye nuburyo bwo gukoresha, hydroxyethyl selulose irashobora kongerwaho mubyiciro bitandukanye mugikorwa cyo gutwikira. Ubwoko bukwirakwiza vuba burashobora kongerwaho muburyo bwa poro yumye. Nyamara, pH agaciro ka sisitemu mbere yo kongeramo igomba kuba munsi ya 7, cyane cyane ko hydroxyethyl selulose ishonga buhoro buhoro ku giciro gito cya pH, kandi hari igihe gihagije kugirango amazi yinjire imbere mubice, hanyuma agaciro ka pH kongerewe kugirango gacike vuba. Intambwe zihuye nazo zirashobora gukoreshwa mugutegura icyerekezo runaka cyibisubizo bya kole hanyuma ukabyongera kuri sisitemu yo gutwikira.
Hydroxypropyl methylcelluloseni ibicuruzwa byabonetse mugusimbuza hydroxyl groupe ya glucose ya selile ya selile naturel hamwe nitsinda rya methoxy, mugihe ikindi gice gisimburwa nitsinda rya hydroxypropyl. Ingaruka zayo zibyimbye ahanini ni kimwe na hydroxyethyl selulose. Kandi irwanya kwangirika kwimisemburo, ariko gukomera kwamazi ntabwo ari byiza nkibya hydroxyethyl selulose, kandi bifite ingaruka mbi za gell iyo zishyushye. Kuri hydroxypropyl methylcellulose itunganijwe hejuru, irashobora kongerwaho mumazi mugihe ikoreshejwe. Nyuma yo gukurura no gutatanya, ongeramo ibintu bya alkaline nkamazi ya amoniya kugirango uhindure agaciro ka pH kuri 8-9, hanyuma ubireke kugeza bishonge burundu. Kuri hydroxypropyl methylcellulose itavuwe hejuru, irashobora gushiramo no kubyimba amazi ashyushye hejuru ya 85 ° C mbere yo kuyakoresha, hanyuma igakonjeshwa nubushyuhe bwicyumba, hanyuma ikayungurura amazi akonje cyangwa amazi ya barafu kugirango ayashonga burundu.
ThickIbibyimbye
Ubu bwoko bwo kubyibuha ni bimwe mubicuruzwa byibumba bikora, nka bentonite, magnesium aluminium silicike ibumba, nibindi. Irangwa nuko usibye kubyibuha, binagira ingaruka nziza yo guhagarika, bishobora kwirinda kurohama, kandi ntibizagira ingaruka kumurwango wamazi. Iyo igifuniko kimaze gukama hanyuma kigakorwa muri firime, ikora nkuwuzuza muri firime ya coating, nibindi. Ikintu kitameze neza nuko bizagira ingaruka zikomeye kurwego rwo gutwikira.
Eter Sintetike ya polymer
Imyunyungugu ya polymer yubukorikori ikoreshwa cyane muri acrylic na polyurethane (Associative thickeners). Ibibyimba bya Acrylic ni polymers ya acrylic irimo amatsinda ya carboxyl. Mu mazi afite pH ifite agaciro ka 8-10, itsinda rya carboxyl riratandukana rikabyimba; iyo agaciro ka pH karenze 10, gashonga mumazi kandi kakabura ingaruka zo kubyimba, bityo ingaruka zo kubyimba zumva cyane agaciro ka pH.
Uburyo bwo kubyimba bwa acrylate kubyimbye ni uko ibice byayo bishobora kwamamazwa hejuru yubutaka bwa latex mu irangi, hanyuma bigakora igipfundikizo nyuma yo kubyimba kwa alkali, ibyo bikaba byongera ubwinshi bwibice bya latex, bikabuza kugenda kwa Browniya, kandi bikongera ububobere bwa sisitemu yo gusiga amarangi. ; Icya kabiri, kubyimba kubyimbye byongera ubwiza bwicyiciro cyamazi.
(2) Ingaruka zo kubyibuha kumiterere
Ingaruka yubwoko bwibyimbye kumiterere ya rheologiya ya coating nuburyo bukurikira:
Iyo ubwinshi bwibyimbye bwiyongereye, ubwiza buhagaze bwirangi bwiyongera cyane, kandi ihinduka ryimyororokere irahuza cyane cyane iyo ikozwe nimbaraga zo hanze.
Hamwe ningaruka zo kubyimba, ubwiza bwirangi bugabanuka vuba iyo bukozwe ningufu zogosha, byerekana pseudoplastique.
Ukoresheje hydrophobique yahinduwe ya selile ya selile (nka EBS451FQ), ku gipimo cyogosha cyane, ibishishwa biracyari hejuru mugihe umubare ari munini.
Ukoresheje umubyimba wa polyurethane ufatika (nka WT105A), ku gipimo cyogosha cyane, ubukonje buracyari hejuru mugihe umubare ari munini.
Ukoresheje umubyimba wa acrylic (nka ASE60), nubwo ubwiza bwa static buzamuka vuba iyo ubwinshi ari bwinshi, ibishishwa bigabanuka vuba kurwego rwo hejuru.
3. Kwiyongera kwinshi
(1) uburyo bwo kubyimba
Cellulose ether hamwe na alkali-yabyimbye ya acrylic yibyibushye irashobora gusa kubyimba icyiciro cyamazi, ariko ntigire ingaruka yibyibindi bice bigize irangi rishingiye kumazi, ntanubwo bishobora gutera imikoranire igaragara hagati yibibara biri mwirangi hamwe nuduce twa emulioni, bityo rheologiya y irangi ntishobora guhinduka.
Ibibyimba bya Associative birangwa muribyo usibye kubyimba binyuze mumazi, binabyibuha binyuze mumashyirahamwe hagati yabo, hamwe nibice bitatanye, hamwe nibindi bice muri sisitemu. Iri shyirahamwe ritandukana ku gipimo cyinshi cyo kwogosha kandi ryongera gufatanya ku gipimo gito cyo kogoshesha, bituma imvugo y’imyenda ihinduka.
Uburyo bwo kubyibuha bwa Associative thickening ni uko molekile yayo ari umurongo wa hydrophilique, umurongo wa polymer hamwe nitsinda rya lipofilique kumpande zombi, ni ukuvuga ko rifite amatsinda ya hydrophilique na hydrophobique mumiterere, bityo ikaba ifite ibiranga molekile zidasanzwe. kamere. Iyo molekile yibyibushye ntishobora gusa kubyimba no kubyimba kugirango igabanye icyiciro cyamazi, ariko kandi ikora micelles mugihe ubwinshi bwumuti wacyo wamazi urenze agaciro runaka. Micelles irashobora guhuza na polymer ibice bya emulsiyo hamwe na pigment ya pigment yamamaje ikwirakwiza kugirango ibe imiterere y'urusobekerane rw'imiterere itatu, kandi irahuzwa kandi ifatanye kugirango yongere ububobere bwa sisitemu.
Icy'ingenzi kurushaho ni uko ayo mashyirahamwe ari muburyo buringaniye, kandi izo micelles zifitanye isano zirashobora guhindura imyanya yazo mugihe zatewe imbaraga ziva hanze, kuburyo igifuniko gifite imiterere iringaniye. Byongeye kandi, kubera ko molekile ifite micelles nyinshi, iyi miterere igabanya imyumvire ya molekile zamazi kwimuka bityo bikongerera ubwiza bwicyiciro cyamazi.
(2) Uruhare rwo gutwikira
Ibyinshi mubyibushye bifatanyiriza hamwe ni polyurethanes, kandi uburemere bwa molekile bugereranije buri hagati yubunini bwa 103-104, ubunini bubiri bwubunini buri munsi ya acide polyacrylic isanzwe hamwe na selile ya selile ifite uburemere bugereranije hagati ya 105-106. Bitewe nuburemere buke bwa molekuline, ingano yingirakamaro yiyongera nyuma ya hydration iba mike, bityo umurongo wacyo wijimye uraryoshye kuruta iyindi idahuza.
Bitewe n'uburemere buke bwa molekuline yibyibushye, kwifata hagati ya intermolecular mugice cyamazi ni bike, kubwibyo ingaruka zabyo mubyiciro byamazi ntabwo ari ngombwa. Mu gipimo gito cyogosha, ihinduka ryishyirahamwe hagati ya molekile ntirirenze gusenya kwishyirahamwe hagati ya molekile, sisitemu yose ikomeza imiterere ihagarikwa no gutatanya, kandi ubwiza bwegereye ubwiza bwikwirakwizwa ryamazi (amazi). Kubwibyo, kwishyira hamwe kwingirakamaro bituma amazi ashingiye kumazi yerekana ububobere buke bugaragara mugihe kiri mukarere gake.
Kwiyongera kwingirakamaro byongera ingufu zishoboka hagati ya molekile bitewe nisano iri hagati yibice mubice bitatanye. Muri ubu buryo, hakenewe imbaraga nyinshi kugirango uhagarike isano iri hagati ya molekile ku gipimo cyinshi cyo gukata, kandi imbaraga zogosha zisabwa kugirango umuntu agere kuntambwe imwe nayo nini, kuburyo sisitemu yerekana igipimo cyinshi cyogosha kurwego rwo hejuru. Kugaragara neza. Uburebure bwo hejuru-bwogosha cyane hamwe nubukonje buke bwo hasi burashobora gusa kubura kubura ibibyimbye bisanzwe mumiterere ya rheologiya irangi, ni ukuvuga ko ibibyimba byombi bishobora gukoreshwa muguhuza amazi kugirango irangi rya latex. Imikorere ihindagurika, kugirango yuzuze ibisabwa byuzuye byo gutwikira muri firime yuzuye no gutwikira firime.
Igihe cyo kohereza: Apr-28-2024