Redispersible polima ufa kupanga njira

Mawu Oyamba

Redispersible polima ufa (RDP) ndi mtundu wa ufa wa polima womwe ukhoza kutulutsidwanso m'madzi kuti upange emulsion yokhazikika. Amagwiritsidwa ntchito kwambiri pantchito yomanga ngati chowonjezera kuti apititse patsogolo magwiridwe antchito a simenti. RDP imapangidwa ndi njira yotchedwa spray-drying, yomwe imaphatikizapo atomization ya yankho la polima kukhala ufa wabwino. The ufa ndiye zouma ndi milled kwa ankafuna tinthu kukula.

Njira yopangira RDP imaphatikizapo njira zingapo, kuphatikiza kusankha polima, kukonza yankho, atomization, kuyanika, ndi mphero. Ubwino wa mankhwala omaliza umadalira kwambiri ubwino wa zipangizo ndi ndondomeko zomwe zimagwiritsidwa ntchito popanga.

Kusankhidwa kwa polima

Gawo loyamba popanga RDP ndikusankha polima yoyenera. Kusankhidwa kwa polima kumatengera zomwe zimafunidwa pazomaliza, monga kukana madzi, kumamatira, komanso kusinthasintha. Ma polima omwe amagwiritsidwa ntchito kwambiri popanga RDP ndi vinyl acetate-ethylene copolymers, acrylic copolymers, ndi styrene-butadiene copolymer.

Kukonzekera Mayankho

Polima atasankhidwa, ndiye kuti amasungunuka mu zosungunulira kuti apange yankho. Zosungunulira zomwe zimagwiritsidwa ntchito kwambiri popanga RDP ndi madzi ndi zosungunulira zachilengedwe monga ethanol ndi isopropanol. Kuchuluka kwa yankho la polima nthawi zambiri kumakhala pakati pa 10-20%.

Atomization

Gawo lotsatira popanga RDP ndi atomization. Atomization ndi njira yothyola yankho la polima kukhala madontho ang'onoang'ono. Izi zimachitika makamaka pogwiritsa ntchito nozzle yothamanga kwambiri kapena atomizer yozungulira. Kenako madonthowo amaumitsa mumtsinje wa mpweya wotentha kuti apange ufa.

Kuyanika

Kenako ufawo umawumitsidwa mu mpweya wotentha kuti uchotse zosungunulirazo. Njira yowumitsa nthawi zambiri imachitika pa kutentha kwa 80-120 ° C. Nthawi yowumitsa imatengera mtundu wa polima womwe umagwiritsidwa ntchito, kuchuluka kwa yankho, komanso kukula kwa tinthu komwe timafunikira.

Kugaya

Gawo lomaliza popanga RDP ndi mphero. Kugaya ndi njira yopera ufawo kuti ukhale wabwino kwambiri. Izi zimachitika kawirikawiri pogwiritsa ntchito nyundo kapena mpira. Kukula kwa tinthu komaliza kumakhala pakati pa 5-50 microns.

Mapeto

Redispersible polima ufa ndi mtundu wa ufa wa polima womwe ukhoza kubalalitsidwanso m'madzi kuti upange emulsion yokhazikika. Amagwiritsidwa ntchito kwambiri pantchito yomanga ngati chowonjezera kuti apititse patsogolo magwiridwe antchito a simenti. Njira yopangira RDP imaphatikizapo njira zingapo, kuphatikiza kusankha polima, kukonza yankho, atomization, kuyanika, ndi mphero. Ubwino wa mankhwala omaliza umadalira kwambiri ubwino wa zipangizo ndi ndondomeko zomwe zimagwiritsidwa ntchito popanga.