Iyini I-Emulsion Powder Ephinda Ihlakazeka?

I-redispersible emulsion powder (RDP), eyaziwa nangokuthi i-redispersible polymer powder, iwuhlobo oluyimpuphu lwe-emulsion polymer esekelwe emanzini. Ivamise ukukhiqizwa ngokufafaza okomisa ingxube ye-polymer dispersion, ngokuvamile esekelwe ku-vinyl acetate-ethylene (VAE) noma ama-copolymers e-vinyl acetate-versatile (VAC/VeoVa), anezithasiselo ezihlukahlukene njengama-colloid okuvikela, ama-surfactants, nama-plasticizers.

Nansi indlela i-emulsion powder ehlakazeka ngayo ekhiqizwa ngayo kanye nezici zayo ezibalulekile:

Inqubo Yokukhiqiza:

1. I-Polymer Emulsion: I-emulsion ye-polymer ilungiswa ngama-monomers e-polymerizing njenge-vinyl acetate, i-ethylene, namanye ama-comonomers phambi kwamanzi nama-emulsifiers. Le nqubo iholela ekwakhekeni kwezinhlayiya ze-polymer ezincane ezihlakazekile emanzini.
2. Ukwengezwa Kwezithako: Izithasiselo ezifana nama-colloid avikelayo, ama-surfactants, nama-plasticizers angase afakwe ku-emulsion ukuze kulungiswe izakhiwo nokusebenza kwawo.
3. I-spray Drying: I-emulsion ye-polymer ibe isifakwa endaweni yokomisa isifutho, lapho ifakwa khona amaconsi amahle bese yomiswa kusetshenziswa umoya oshisayo. Njengoba amanzi ehwamuka, izinhlayiya eziqinile ze-polymer zakha, okuholela ekubeni impushana egeleza mahhala.
4. Ukuqoqwa Nokupakishwa: Impushana eyomile iqoqwa ngaphansi kwesomisi sesifutho, isefe ukuze kukhishwe noma yiziphi izinhlayiya ezinkulu, bese ipakishwa ukuze igcinwe futhi ihanjiswe.

Izimpawu Ezisemqoka:

1. Usayizi Wezinhlayiya: Impushana ye-emulsion ehlakazeka kabusha ngokuvamile iqukethe izinhlayiya eziyindilinga ezinobubanzi obusuka kuma-micrometer ambalwa kuya kumashumi ama-micrometer, kuye ngenqubo ethile yokukhiqiza nokubunjwa.
2. Ukuhlakazeka kabusha Kwamanzi: Esinye sezici ezibaluleke kakhulu ze-RDP amandla ayo okuphinde ahlakazeke emanzini ukuze kwakhe i-emulsion ezinzile lapho ixutshwe namanzi. Lokhu kuvumela ukufakwa kalula ekwakhiweni okusekelwe emanzini okufana nodaka, okokunamathiswa, nama-coatings.
3. Okuqukethwe kwe-Polymer: I-RDP ngokuvamile iqukethe okuqukethwe okuphezulu kwe-polymer solids, ngokuvamile esukela ku-50% kuya ku-80% ngesisindo, kuye ngohlobo oluthile lwe-polymer nokwakheka.
4. Ukubunjwa Kwamakhemikhali: Ukwakheka kwamakhemikhali e-RDP kuyehluka kuye ngohlobo lwe-polymer esetshenzisiwe kanye nanoma yiziphi izithasiselo ezengeziwe ezifakwe phakathi nenqubo yokukhiqiza. Ama-polymers ajwayelekile asetshenziswa ku-RDP afaka i-vinyl acetate-ethylene (VAE) copolymers nama-vinyl acetate-versatile (VAC/VeoVa) copolymers.
5. Izakhiwo Zokusebenza: I-RDP inikezela ngezinto eziningi ezifiselekayo ekwakhiweni, okuhlanganisa ukunamathela okuthuthukisiwe, ukuguquguquka, ukumelana namanzi, nokuqina. Ithuthukisa ukusebenza, amandla emishini, kanye nokusebenza kwezinto zokwakha ezahlukahlukene ezinjengodaka, izinto zokunamathisela zamathayela, ama-renders, nezinhlanganisela zokuzilinganisa.

Ngamafuphi, i-emulsion powder ephindwe kabusha (i-RDP) iwuhlobo oluhlukahlukene lwempuphu yama-polymers emulsion asekelwe emanzini asetshenziswa njengezithasiselo ekwakhiweni okuhlukahlukene kanye nezicelo zezimboni. Ikhono layo lokuphinde lihlakazeke emanzini, okuqukethwe kwe-polymer ephezulu, kanye nezakhiwo zokusebenza ezifiselekayo kuyenza ibe yingxenye ebalulekile ekwakhiweni kwezinto zokwakha ezisezingeni eliphezulu nezihlala isikhathi eside.