Redispersible Polymer Powder (RDP)chinhu chehupfu chinogadzirwa nekuomesa emulsion yepolymer, iyo inowanzoshandiswa muzvinhu zvakadai sekuvaka, machira, zvinonamira, uye zvinonamira mataira. Basa rayo guru nderekuparadzira zvakare mu emulsion nekuwedzera mvura, ichipa kunaka kunamatira, elasticity, kusamira kwemvura, kuramba kwekuputika, uye kuramba kwemamiriro ekunze.
Kuumbwa kweRedispersible Polymer Powder (RDP) inogona kuongororwa kubva kune akawanda maficha, kunyanya kusanganisira zvinotevera zvikamu:
1. Polymer resin
Iyo yakakosha chikamu cheRedispersible Polymer Powder ipolymer resin, inowanzova polymer inowanikwa neemulsion polymerization. Yakajairika polymer resins inosanganisira:
Polyvinyl doro (PVA): ine yakanaka adhesion uye firimu-inogadzira zvivakwa uye inoshandiswa zvakanyanya mukuvaka zvinhu.
Polyacrylates (senge polyacrylates, polyurethanes, nezvimwewo): ane elasticity yakanakisa, kusimba kwekubatanidza, uye kuramba mvura.
Polystyrene (PS) kana ethylene-vinyl acetate copolymer (EVA): inowanzoshandiswa kuvandudza mafirimu ekugadzira zvinhu, kuwedzera kudzivirira kwemvura, uye kusagadzikana kwemamiriro ekunze.
Polymethyl methacrylate (PMMA): Iyi polymer ine yakanaka anti-kuchembera uye pachena.
Aya mapolymer resins anoumba emulsions kuburikidza nepolymerization reactions, uye ipapo mvura iri mu emulsion inobviswa nekupfapfaidza kuomesa kana kuomesa nechando, uye pakupedzisira Redispersible Polymer Powder (RDP) muhupfu fomu inowanikwa.
2. Surfactants
Kuti uchengetedze kugadzikana pakati pemapolymer particles uye kudzivirira agglomeration muhupfu, huwandu hwakakodzera hwemasurfactants huchawedzerwa panguva yekugadzira. Basa rema surfactants nderokudzikisa kusawirirana kwepasi pakati pezvimedu uye kubatsira zvidimbu zvipararire mumvura. Common surfactants anosanganisira:
Non-ionic surfactants (zvakadai semapolyethylene, polyethylene glycols, nezvimwewo).
Anionic surfactants (senge fatty acid salts, alkyl sulfonates, nezvimwewo).
Aya ma surfactants anogona kuwedzera dispersibility yeRedispersible Polymer Powder (RDP)s, zvichibvumira iyo latex poda kuti igadzire zvakare emulsion mushure mekuwedzera mvura.
3. Fillers uye thickeners
Kuti ugadzirise mashandiro elatex poda uye kuderedza mutengo, mamwe mafirita uye makobvu anogona zvakare kuwedzerwa panguva yekugadzira. Kune akawanda marudzi emafiller, uye akajairika anosanganisira:
Calcium carbonate: inowanzoshandiswa inorganic filler inogona kuwedzera kunamatira uye kugadzirisa mutengo-kushanda.
Talc: inogona kuwedzera fluidity uye kupaza kuramba kwezvinhu.
Silicate zvicherwa: senge bentonite, yakawedzera graphite, nezvimwewo, inogona kuwedzera kuputika kupikisa uye kushorwa kwemvura kwezvinhu.
Thickeners anowanzo shandiswa kugadzirisa viscosity yechigadzirwa kuti ichinje kune akasiyana ekuvaka mamiriro. Zvakajairwa thickeners zvinosanganisira hydroxypropyl methylcellulose (HPMC) uye polyvinyl doro (PVA).
4. Anti-caking agent
Muzvigadzirwa zvehupfu, kuitira kudzivirira kuungana panguva yekuchengetedza uye yekufambisa, anti-caking agents anogonawo kuwedzerwa panguva yekugadzira. Anti-caking agents kunyanya zvimwe zvakanaka inorganic zvinhu, akadai aruminiyamu silicate, nesilicon dioxide, etc. Izvi zvinhu zvinogona kuumba inodzivirira firimu pamusoro pemvura latex upfu particles kudzivirira zvimedu kubva agglomerating pamwechete.
5. Zvimwe zvinowedzera
Redispersible Polymer Powder (RDP) inogonawo kunge iine zvimwe zvakakosha zvekuwedzera zvekuvandudza chaiyo zvivakwa:
UV-inodzivirira mumiriri: inovandudza kupikisa kwemamiriro ekunze uye anti-kuchembera kugona kwezvinhu.
Antibacterial agent: inoderedza kukura kwe microorganisms, kunyanya kana inoshandiswa munzvimbo ine hunyoro.
Plasticizer: inovandudza kushanduka uye kutsemuka kuramba kwelatex poda.
Antifreeze: Dzivirira zvinhu kubva kuchando munzvimbo dzakaderera tembiricha, zvichikanganisa kuvaka uye kushandisa mhedzisiro.
6. Hunyoro
Kunyangwe Redispersible Polymer Powder (RDP) iri muchimiro chehupfu hwakaoma, inodawo humwe huwandu hwekudzora hunyoro panguva yekugadzira, uye hunyoro hunowanzo kudzorwa pasi pe1%. Hunyoro hwakakodzera hunobatsira kuchengetedza fluidity uye kugadzikana kwenguva refu kwehupfu.
Basa uye kuita kweRedispersible Polymer Powder (RDP)
Basa rakakosha reRedispersible Polymer Powder (RDP) nderekuti inogona kuparadzirwa zvakare kugadzira emulsion mushure mekuwedzera mvura, uye ine anotevera akakosha maitiro ekuita:
Yakanakisa adhesion: Kuvandudza kugona kwekubatanidza kwejasi uye zvinonamira, uye kunatsiridza kusimba kwekubatanidza pakati pezvivakwa zvekuvaka.
Elasticity uye kuchinjika: Kuvandudza elasticity yejasi, wedzera kutsemuka kwayo kuramba uye kukanganisa kupikisa.
Kupokana kwemvura: Wedzera kudzivirira kwemvura kwechinhu, chakakodzera kushandiswa munzvimbo dzekunze kana dzine hunyoro.
Kuramba kwemamiriro ekunze: Kuvandudza iyo UV kuramba, anti-kuchembera uye zvimwe zvivakwa, uye kuwedzera hupenyu hwayo hwesevhisi.
Crack resistance: Iine yakanaka crack resistance uye inokodzera anti-kuparuka zvinodiwa mumapurojekiti ekuvaka.
RDPinogadzirwa nekushandura emulsion polymer kuita hupfu kuburikidza nemaitiro akaomarara. Iyo ine zvakawanda zvakanaka zvivakwa uye inoshandiswa zvakanyanya mukuvaka, machira, anonamira uye mamwe minda. Kusarudzwa uye chikamu chezvigadzirwa zvayo zvinokanganisa zvakananga kushanda kwayo kwekupedzisira.
Nguva yekutumira: Mar-11-2025