Iipolymer powders eziphinda zihlakazwe (RDPs) zidlala indima ebalulekileyo kumashishini ahlukeneyo, kubandakanya ulwakhiwo, izinto zokuncamathelisa, kunye neengubo. Ezi powders zisetyenziswa ngokubanzi ekuphuculeni iipropathi zezinto zesamente, ukuqinisa ukunamathela, ukuguquguquka, kunye nokuqina. Ukuqonda inkqubo yokuveliswa kwee-RDP kubalulekile kubavelisi ukuqinisekisa iimveliso ezikumgangatho ophezulu.
Iimpahla ezingekasilwa :
Imveliso yepolymer powders enokuphinda ihlakazwe iqala ngokukhetha ngononophelo imathiriyeli ekrwada enefuthe kwiipropati zemveliso yokugqibela. Amacandelo aphambili abandakanya i-polymer resins, i-colloids ekhuselayo, iiplasticizers, kunye nezongezo ezahlukeneyo.
I-Polymer Resins: I-Ethylene-vinyl acetate (EVA), i-vinyl acetate-ethylene (VAE), kunye neepolymers ze-acrylic zisetyenziswa ngokuqhelekileyo njengezona zinto ziphambili ze-polymer. Ezi resin zibonelela ngokubambelela, ukuguquguquka, kunye nokumelana namanzi kwii-RDPs.
I-Colloids ekhuselayo: I-hydrophilic colloids ekhuselayo efana ne-polyvinyl alcohol (PVA) okanye i-cellulose ethers yongezwa ukuzinzisa amaqhekeza e-polymer ngexesha lokumisa nokugcinwa, ukukhusela ukuhlanganiswa.
IiPlastiki: Iiplastiki ziphucula ukuguquguquka kunye nokusebenza kwee-RDPs. Iiplastiki eziqhelekileyo ziquka i-glycol ethers okanye i-polyethylene glycols.
Izongezo: Izongezo ezahlukeneyo ezinje nge-dispersants, thickeners, kunye ne-cross-linking agents zinokudityaniswa ukuphucula iipropathi ezithile ezinje nge-dispersibility, rheology, okanye amandla omatshini.
IiNdlela zokuSebenza :
Ukuveliswa kweepolymer powders ezinokuphinda zihlakazwe kubandakanya amanyathelo amaninzi okucubungula, kubandakanywa i-emulsion polymerization, ukomisa ukutshiza, kunye neenkqubo emva kokunyanga.
I-Emulsion Polymerization:
Inkqubo iqala nge-emulsion polymerization, apho i-monomers, amanzi, i-emulsifiers, kunye ne-initiators zixutywe kwi-reactor phantsi kweemeko ezilawulwayo zokushisa kunye noxinzelelo. Iimonomers zipolymerize zenze amasuntswana elatex asasazwe emanzini. Ukukhethwa kweemonomers kunye neemeko zokusabela kugqiba ukubunjwa kwepolymer kunye neempawu.
Uzinziso kunye nokuManyanzeliswa:
Emva kwe-polymerization, i-latex ifumana ukuzinza ngokudibanisa i-colloids ekhuselayo kunye ne-stabilizers. Eli nyathelo lithintela i-particle coagulation kwaye iqinisekisa ukuzinza kwe-latex dispersion. I-coagulation agents zingangeniswa ukuze zenze i-coagulation elawulwayo yeengqungquthela ze-latex, zenze i-coagulum ezinzileyo.
Ukutshiza ukomisa:
I-latex dispersion ezinzileyo iye yotyiswa kwisitshizi sokutshiza. Kwigumbi lokumisa i-spray, i-dispersion i-atomized ibe ngamaconsi amancinci kusetyenziswa imibhobho yoxinzelelo oluphezulu. Umoya oshushu ungeniswa ngaxeshanye ukuze ukhuphe amanzi abe ngumphunga, ushiye ngasemva amasuntswana epolymer aqinileyo. Iimeko zokomisa, kubandakanywa ukushisa komoya wokungena, ixesha lokuhlala, kunye nesantya sokuhamba komoya, kuchaphazela i-particle morphology kunye nezakhiwo ze powder.
Emva koNyango:
Ukulandela ukomisa ukutshiza, i-polymer powder ephumayo idlula kwiinkqubo zonyango emva kokuphucula ukusebenza kwayo kunye nokuzinza kokugcinwa. Ezi nkqubo zinokubandakanya ukulungiswa komphezulu, igranulation, kunye nokupakishwa.
a. Ukuguqulwa koMphezulu: I-agent esebenzayo kwi-surface-active okanye i-cross-linking agents ingasetyenziselwa ukuguqula iimpawu ze-polymer particles, ukuphucula ukuchithwa kwazo kunye nokuhambelana nezinye izinto.
b. I-Granulation: Ukuphucula ukuphatha kunye ne-dispersibility, i-polymer powder inokungena kwi-granulation ukuvelisa ubukhulu obufanayo kunye nokunciphisa ukubunjwa kothuli.
c. Ukupakishwa: Ii-RDPs zokugqibela zipakishwe kwizikhongozeli ezinganyangekiyo ukufuma ukuthintela ukufunxwa komswakama kunye nokugcina uzinzo ngexesha lokugcinwa nokuthuthwa.
Imilinganiselo yoLawulo loMgangatho:
Ukulawulwa komgangatho kubalulekile kuyo yonke inkqubo yokuvelisa ukuqinisekisa ukuhambelana kunye nokuthembeka kwiipropati ze-polymer powders eziphinda ziphindwe. Iiparamitha ezininzi eziphambili zibekwe esweni kwaye zilawulwe kumanqanaba ahlukeneyo:
Umgangatho weMpahla ekrwada: Ukuhlolwa ngokucokisekileyo kunye novavanyo lwemathiriyeli ekrwada, kubandakanywa iipolymers, iicolloids, kunye nezongezo, zenziwa ukuze kuqinisekiswe umgangatho wazo, ubunyulu, kunye nokuhambelana nesicelo esicetywayo.
Ukujongwa kweNkqubo: Iiparamitha zenkqubo ebalulekileyo ezifana nobushushu bokuphendula, uxinzelelo, amazinga okutya kwe-monomer, kunye neemeko zokomisa zihlala zibekwe esweni kwaye zihlengahlengiswa ukuze kugcinwe umgangatho wemveliso kunye nokuhambelana.
Ubume beNcam yeNcam: Ukuhanjiswa kobungakanani besuntswana, i-morphology, kunye neepropathi zomphezulu wepolymer powders zihlalutywa kusetyenziswa ubuchule obufana ne-laser diffraction, i-electron microscopy, kunye nohlalutyo lwendawo yomphezulu.
Uvavanyo lokuSebenza: Iipolymer powders ezinokuphinda zisasazwe kwakhona zivavanywa ngokusebenza ngokubanzi ukuvavanya amandla azo okuncamathelayo, ukwakheka kwefilimu, ukuxhathisa kwamanzi, kunye neempawu zoomatshini ngokwemigangatho yoshishino kunye neemfuno zabathengi.
Uvavanyo lokuzinza: Iimvavanyo ezikhawulezayo zokuguga kunye nezifundo zokuzinza ziqhutyelwa ukuvavanya ukuzinza kwexesha elide le-RDP phantsi kweemeko ezahlukeneyo zokugcina, kubandakanywa ukuhluka kweqondo lokushisa kunye nomswakama.
Ukuveliswa kweepolymer powders eziphindwe kabini kubandakanya uchungechunge olunzima lwamanyathelo, ukusuka kwi-emulsion polymerization ukuya kwi-spray drying kunye neenkqubo zokunyanga. Ngokulawula ngononophelo imathiriyeli ekrwada, iiparamitha zokucubungula, kunye namanyathelo okulawula umgangatho, abavelisi banokuqinisekisa umgangatho ongaguqukiyo kunye nokusebenza kwee-RDPs kwiinkqubo ezahlukeneyo zokwakha, izinto zokuncamathelisa, kunye namashishini okwambathisa. Ukuqonda ukuntsonkotha kwenkqubo yemveliso kubalulekile ekuphuculeni iimpawu zemveliso kunye nokuhlangabezana neemfuno eziguqukayo zabathengi kwimarike.
Ixesha lokuposa: Mar-12-2024