Iipowder zepolymer eziphinda zichithwe (ii-RDP) zidlala indima ebalulekileyo kumashishini ahlukeneyo, kuquka ulwakhiwo, izinto zokuncamathelisa, kunye neengubo. Ezi powder zisetyenziswa kakhulu ekuphuculeni iimpawu zezinto eziqinisa isamente, ukuphucula ukunamathela, ukuguquguquka, kunye nokuqina. Ukuqonda inkqubo yokuvelisa ii-RDP kubalulekile kubavelisi ukuqinisekisa iimveliso ezisemgangathweni ophezulu.
Iimpahla ezingekasilwa :
Ukuveliswa kweempuphu zepolymer eziphinda zichithwe kuqala ngokukhetha ngononophelo izinto eziluhlaza ezichaphazela iimpawu zemveliso yokugqibela. Izinto eziphambili ziquka ii-resin zepolymer, ii-colloids ezikhuselayo, ii-plasticizers, kunye nezinye izongezo ezahlukeneyo.
IiPolymer Resins: I-Ethylene-vinyl acetate (EVA), i-vinyl acetate-ethylene (VAE), kunye nee-acrylic polymers zisetyenziswa kakhulu njengee-polymer resins eziphambili. Ezi resins zibonelela ngokunamathela, ukuguquguquka, kunye nokumelana namanzi kwi-RDPs.
IiColloids eziKhuselayo: IiColloids ezikhuselayo eziphila emanzini ezifana ne-polyvinyl alcohol (PVA) okanye ii-cellulose ethers zongezwa ukuze ziqinise amasuntswana e-polymer ngexesha lokomiswa nokugcinwa, nto leyo ethintela ukuhlangana.
Iiplastiki: Iiplastiki ziphucula ukuguquguquka nokusebenza kakuhle kwee-RDP. Iiplastiki eziqhelekileyo ziquka ii-glycol ethers okanye ii-polyethylene glycols.
Izongezo: Izongezo ezahlukeneyo ezifana nezisasazi, izithambisi, kunye nee-arhente zokudibanisa zinokufakelwa ukuphucula iipropati ezithile ezifana nokusasazeka, i-rheology, okanye amandla oomatshini.
Iindlela Zokucubungula:
Ukuveliswa kweempuphu zepolymer eziphinda zichithwe kubandakanya amanyathelo aliqela okucubungula anzima, kuquka ukwenziwa kwe-emulsion polymerization, ukomisa nge-spray, kunye neenkqubo zasemva konyango.
Ukwenziwa kwe-Emulsion Polymerization:
Inkqubo iqala nge-emulsion polymerization, apho ii-monomers, amanzi, ii-emulsifiers, kunye nee-initiators zixutywa kwi-reactor phantsi kweemeko ezilawulwayo zobushushu kunye noxinzelelo. Ii-monomers polymerize zenze amasuntswana e-latex asasazeke emanzini. Ukukhethwa kwee-monomers kunye neemeko zokusabela kumisela ukwakheka kwe-polymer kunye neempawu.
Ukuzinza kunye nokujiya:
Emva kokuba i-polymerize, i-latex iyazinzisa ngokongeza ii-colloids ezikhuselayo kunye neziqinisi. Eli nyathelo lithintela ukujiya kwamasuntswana kwaye liqinisekisa uzinzo lokusasazwa kwe-latex. Ii-agents zokujiya zinokungeniswa ukuze zibangele ukujiya okulawulwayo kwamasuntswana e-latex, zenze i-coagulum ezinzileyo.
Ukomisa ngeSpray:
Ukusasazwa kwelatex okuzinzileyo emva koko kufakwa kwisixhobo sokufutha. Kwigumbi lokomisa isifutho, ukusasazwa kwenziwa amaconsi amancinci kusetyenziswa imilomo yoxinzelelo oluphezulu. Umoya oshushu ungeniswa ngaxeshanye ukuze ukhuphe umxholo wamanzi, ushiye amasuntswana epolymer aqinileyo. Iimeko zokomisa, kubandakanya ubushushu bomoya wokungena, ixesha lokuhlala, kunye nesantya sokuhamba komoya, zichaphazela imo yeesuntswana kunye neempawu zomgubo.
Emva koNyango:
Emva kokomiswa ngesitshizi, umgubo wepolymer ophumayo udlula kwiinkqubo zasemva konyango ukuphucula ukusebenza kwawo kunye nozinzo lokugcina. Ezi nkqubo zinokubandakanya ukuguqulwa komphezulu, i-granulation, kunye nokupakishwa.
a. Ukuguqulwa koMphezulu: Iiarhente ezisebenzayo kumphezulu okanye iiarhente zokudibanisa zingasetyenziswa ukutshintsha iipropati zomphezulu wee-polymer particles, ukuphucula ukusasazeka kwazo kunye nokuhambelana kwazo nezinye izinto.
b. Ukwahlulwahlulwa: Ukuze kuphuculwe ukuphathwa nokusasazeka, umgubo wepolymer ungadlula kwi-granulation ukuvelisa ubungakanani obufanayo beesuntswana kunye nokunciphisa ukwakheka kothuli.
c. Ukupakisha: Ii-RDP zokugqibela zipakishwa kwizikhongozeli ezingangenisi manzi ukuthintela ukufunxwa komswakama nokugcina uzinzo lwazo ngexesha lokugcina nokuthutha.
Amanyathelo oLawulo loMgangatho:
Ulawulo lomgangatho lubalulekile kuyo yonke inkqubo yemveliso ukuqinisekisa ukuhambelana nokuthembeka kwiimpawu zeempuphu zepolymer ezinokuphinda zichithwe. Iiparameter ezininzi eziphambili zijongwa kwaye zilawulwa kwizigaba ezahlukeneyo:
Umgangatho weMpahla ekrwada: Ukuhlolwa nokuvavanywa ngokupheleleyo kwezixhobo ezikrwada, kuquka iipolymers, ii-colloids, kunye nezongezo, kwenziwa ukuqinisekisa umgangatho wazo, ubunyulu, kunye nokuhambelana kwazo nesicelo esicetywayo.
Ukubeka iliso kwiinkqubo: Iiparameter ezibalulekileyo zenkqubo ezifana nobushushu bokusabela, uxinzelelo, amazinga okutya kwe-monomer, kunye neemeko zokomisa zihlala zijongwa kwaye zilungiswa ukuze kugcinwe umgangatho wemveliso kunye nokuhambelana.
Ukuchazwa kweeNgxenye: Ukusasazwa kobungakanani beeNgxenye, imo, kunye neempawu zomphezulu weempuphu zepolymer zihlalutywa kusetyenziswa iindlela ezifana ne-laser diffraction, i-electron microscopy, kunye nohlalutyo lommandla womphezulu.
Uvavanyo Lokusebenza: Iipowder zepolymer eziphinda zichithwe zivavanywa kakhulu ukusebenza kwazo ukuze kuvavanywe amandla azo okuncamathelisa, ukwakheka kwefilimu, ukumelana namanzi, kunye neempawu zoomatshini ngokwemigangatho yoshishino kunye neemfuno zabathengi.
Uvavanyo Lozinzo: Uvavanyo lokwaluphala olukhawulezileyo kunye nezifundo zozinzo zenziwa ukuvavanya uzinzo lwexesha elide lwe-RDP phantsi kweemeko ezahlukeneyo zokugcina, kubandakanya ukutshintsha kobushushu kunye nomswakama.
Ukuveliswa kweempuphu zepolymer eziphinda zichithwe kubandakanya uthotho lwamanyathelo anzima, ukusuka kwi-emulsion polymerization ukuya kwiinkqubo zokomisa nge-spray kunye neenkqubo zasemva konyango. Ngokulawula ngononophelo izinto eziluhlaza, iiparameter zokucubungula, kunye namanyathelo okulawula umgangatho, abavelisi banokuqinisekisa umgangatho ohambelanayo kunye nokusebenza kwe-RDPs kwizicelo ezahlukeneyo kumashishini okwakha, okuncamathiselayo, kunye nokugquma. Ukuqonda ubunzima benkqubo yemveliso kubalulekile ekwenzeni ngcono iimpawu zemveliso kunye nokuhlangabezana neemfuno eziguqukayo zabathengi kwimarike.
Ixesha leposi: Matshi-12-2024