Yintoni i-Redispersible Emulsion Powder?

I-redispersible emulsion powder (RDP), eyaziwa ngokuba yi-polymer powder, i-powder powder, i-powdered powder ye-emulsion polymer yamanzi. Ngokuqhelekileyo iveliswa ngokutshiza ngokumisa umxube we-polymer dispersion, ngokuqhelekileyo isekelwe kwi-vinyl acetate-ethylene (VAE) okanye i-vinyl acetate-versatile (VAC / VeoVa) copolymers, kunye nezongezelelo ezahlukeneyo ezifana ne-colloids yokukhusela, i-surfactants, kunye ne-plasticizers.

Nantsi indlela eveliswa ngayo kwakhona i-emulsion powder kunye neempawu zayo eziphambili:

Inkqubo yeMveliso:

1. I-Emulsion yePolymer: I-emulsion ye-polymer ilungiselelwe nge-polymerizing monomers ezifana ne-vinyl acetate, i-ethylene, kunye nezinye ii-comonomers phambi kwamanzi kunye ne-emulsifiers. Le nkqubo iphumela ekwakhekeni kwamasuntswana epolymer amancinci asasazwe emanzini.
2. Ukongezwa kwezongezelelo: Izongezo ezifana ne-colloids ekhuselayo, i-surfactants, kunye ne-plasticizers inokongezwa kwi-emulsion ukuguqula iipropati kunye nokusebenza kwayo.
3. Ukutshiza Ukomisa: I-emulsion ye-polymer ifakwe kwi-spray dryer, apho i-atomized ibe ngamathontsi amahle kwaye yomiswe ngokusebenzisa umoya oshushu. Njengoko amanzi ephuphuma, amaqhekeza aqinile efom yepolymer, okubangelwa umgubo okhululekileyo.
4. Ukuqokelelwa kunye nokupakishwa: Umgubo omisiweyo uqokelelwa ukusuka ezantsi kwesomisi sokutshiza, uhluzwe ukususa naziphi na iincinci ezigqithisiweyo, kwaye emva koko upakishwe ukugcina kunye nokuthutha.

Iimpawu eziphambili:

1. Ubungakanani beNgxelo: I-emulsion powder edispersible ngokuqhelekileyo iqulethwe ngamasuntswana angama-spherical ane-diameters ukusuka kwii-micrometers ezimbalwa ukuya kwishumi le-micrometers, kuxhomekeke kwinkqubo yokuvelisa kunye nokuqulunqwa.
2. I-Water Redispersibility: Enye yezona mpawu zibalulekileyo ze-RDP kukukwazi ukusabalalisa kwakhona emanzini ukwenza i-emulsion ezinzileyo xa ixutywe namanzi. Oku kuvumela ukuba kube lula ukufakwa kwimiqulu esekwe emanzini njengodaka, i-adhesives, kunye neengubo.
3. Umxholo wePolymer: I-RDP ngokubanzi iqulethe umxholo ophezulu we-polymer solids, ngokuqhelekileyo ukusuka kwi-50% ukuya kwi-80% ngobunzima, kuxhomekeke kuhlobo oluthile lwepolymer kunye nokuqulunqwa.
4. Ukubunjwa kweMichiza: Ukwakhiwa kweekhemikhali ze-RDP kuyahluka ngokuxhomekeka kuhlobo lwepolymer esetyenzisiweyo kunye naziphi na izongezo ezongezelelweyo ezifakwe ngexesha lokuvelisa. Iipolymers eziqhelekileyo ezisetyenziswa kwi-RDP ziquka i-vinyl acetate-ethylene (VAE) copolymers kunye ne-vinyl acetate-versatile (VAC / VeoVa) copolymers.
5. IiPropati zokuSebenza: I-RDP inika uluhlu lweepropati ezinqwenelekayo kuqulunqo, kubandakanywa ukunamathela okuphuculweyo, ukuguquguquka, ukuxhathisa kwamanzi, kunye nokuqina. Iphucula ukusebenza, amandla oomatshini, kunye nokusebenza kwezixhobo ezahlukeneyo zokwakha ezinje ngodaka, izinto zokuncamathelisa iithayile, unikezelo, kunye nekhompawundi zokuzilinganisa.

Isishwankathelo, i-emulsion powder ehlaziywayo (i-RDP) ifom ye-powdered eguquguqukayo yeepolymers ze-emulsion zamanzi ezisetyenziselwa njengezongezo kwizakhiwo ezahlukeneyo kunye nezicelo zoshishino. Ikhono layo lokuphinda lihlakazeke emanzini, umxholo ophezulu wepolymer, kunye neempawu zokusebenza ezinqwenelekayo zenza ukuba ibe yinto ebalulekileyo ekuqulunqweni kwezinto zokwakha ezikumgangatho ophezulu kunye nezizinzileyo.