Redispersible Polima Powder (RDP)ndi chinthu chaufa chopangidwa ndi kuyanika emulsion ya polima, yomwe imagwiritsidwa ntchito kwambiri pazinthu monga zomangamanga, zokutira, zomatira, ndi zomatira matailosi. Ntchito yake yayikulu ndikubalalitsanso mu emulsion powonjezera madzi, kupereka kumamatira kwabwino, kukhazikika, kukana madzi, kukana ming'alu, komanso kukana nyengo.
Kapangidwe ka Redispersible Polymer Powder (RDP) chitha kuwunikidwa kuchokera kuzinthu zingapo, makamaka kuphatikiza izi:
1. Utomoni wa polima
Chigawo chapakati cha Redispersible Polima Powder ndi polima utomoni, amene nthawi zambiri ndi polima wopezedwa ndi emulsion polima. Mitundu yodziwika bwino ya polymer resins ndi:
Mowa wa Polyvinyl (PVA): uli ndi zomatira bwino komanso zopanga mafilimu ndipo zimagwiritsidwa ntchito kwambiri pomanga.
Polyacrylates (monga polyacrylates, polyurethanes, ndi zina zotero): ali ndi kusungunuka kwakukulu, mphamvu zomangirira, ndi kukana madzi.
Polystyrene (PS) kapena ethylene-vinyl acetate copolymer (EVA): yomwe imagwiritsidwa ntchito kwambiri kupititsa patsogolo mapangidwe opanga mafilimu, kuwonjezera kukana madzi, komanso kukana nyengo.
Polymethyl methacrylate (PMMA): Polima iyi ili ndi anti-kukalamba komanso kuwonekera.
Izi polima resins kupanga emulsions kudzera polymerization zimachitikira, ndiyeno madzi emulsion amachotsedwa ndi kupopera kuyanika kapena amaundana kuyanika, ndipo potsiriza Redispersible Polima Powder (RDP) mu mawonekedwe ufa analandira.
2. Zowoneka
Pofuna kukhala bata pakati polima particles ndi kupewa agglomeration mu ufa, yoyenerera kuchuluka kwa surfactants zidzawonjezedwa pa kupanga ndondomeko. Ntchito ya ma surfactants ndi kuchepetsa kusamvana kwapakati pakati pa tinthu tating'onoting'ono ndikuthandizira kuti tinthu tibalalika m'madzi. Ma surfactants wamba ndi awa:
Ma surfactants a non-ionic (monga ma polyethylene glycols, polyethylene glycols, etc.).
Anionic surfactants (monga mafuta acid salt, alkyl sulfonates, etc.).
Ma surfactants awa amatha kupititsa patsogolo kufalikira kwa Redispersible Polymer Powder (RDP)s, kulola ufa wa latex kupanganso emulsion pambuyo powonjezera madzi.
3. Fillers ndi thickeners
Kuti muthe kusintha magwiridwe antchito a ufa wa latex ndikuchepetsa mtengo, ma fillers ena ndi thickeners amathanso kuwonjezeredwa panthawi yopanga. Pali mitundu yambiri ya fillers, ndipo yodziwika bwino ndi:
Calcium carbonate: chodzaza chomwe chimagwiritsidwa ntchito kwambiri chomwe chimatha kuwonjezera kumamatira ndikupangitsa kuti ikhale yotsika mtengo.
Talc: imatha kuonjezera madzimadzi komanso kukana kwa zinthuzo.
Silicate mchere: monga bentonite, kukodzedwa graphite, etc., akhoza kumapangitsanso mng'alu kukana ndi kukana madzi zinthu.
Ma thickeners nthawi zambiri amagwiritsidwa ntchito kusintha kukhuthala kwa chinthucho kuti agwirizane ndi mikhalidwe yosiyanasiyana yomanga. Zokhuthala wamba zimaphatikizapo hydroxypropyl methylcellulose (HPMC) ndi polyvinyl alcohol (PVA).
4. Anti-caking wothandizira
Muzinthu zopangidwa ndi ufa, pofuna kupewa kuphatikizika panthawi yosungira ndi kuyendetsa, anti-caking agents akhoza kuwonjezeredwa panthawi yopanga. Anti-caking wothandizira makamaka ena zabwino inorganic zinthu, monga zotayidwa silicate, pakachitsulo woipa, etc. Zinthu zimenezi akhoza kupanga zoteteza filimu padziko lalabala ufa particles kuteteza particles kuchokera agglomerating pamodzi.
5. Zina zowonjezera
Redispersible Polymer Powder (RDP) itha kukhalanso ndi zowonjezera zina zapadera kuti ziwongolere zinthu zina:
UV-resistant wothandizira: amathandizira kukana kwanyengo komanso kuthekera koletsa kukalamba kwazinthu.
Antibacterial wothandizira: amachepetsa kukula kwa tizilombo tating'onoting'ono, makamaka tikamagwiritsidwa ntchito m'malo achinyezi.
Plasticizer: imathandizira kusinthasintha komanso kukana kwa latex ufa.
Antifreeze: Pewani zinthu kuti zisazizire m'malo otentha kwambiri, zomwe zimakhudza mapangidwe ndi ntchito.
6. Chinyezi
Ngakhale Redispersible Polymer Powder (RDP) ili mu mawonekedwe a ufa wouma, imafunanso kuchuluka kwa chinyezi panthawi yopanga, ndipo chinyezi chimakhala pansi pa 1%. Chinyezi choyenera chimathandizira kukhalabe ndi madzi komanso kukhazikika kwa nthawi yayitali kwa ufa.
Udindo ndi magwiridwe antchito a Redispersible Polymer Powder (RDP)
Udindo waukulu wa Redispersible Polymer Powder (RDP) ndikuti ukhoza kubalalitsidwanso kuti upangitse emulsion pambuyo powonjezera madzi, ndipo uli ndi machitidwe ofunikira awa:
Kumamatira kwabwino kwambiri: Kupititsa patsogolo luso lomangirira la zokutira ndi zomatira, ndikuwonjezera mphamvu zomangira pakati pa zida zomangira.
Elasticity ndi kusinthasintha: Sinthani kusinthasintha kwa zokutira, onjezerani kukana kwake kwa ming'alu ndi kukana kwake.
Kukaniza madzi: Limbikitsani kukana kwamadzi pazinthu, zoyenera kugwiritsidwa ntchito kunja kapena m'malo achinyezi.
Kukana kwanyengo: Sinthani kukana kwa UV, anti-kukalamba ndi zinthu zina, ndikukulitsa moyo wake wautumiki.
Kulimbana ndi ming'alu: Ili ndi mphamvu yabwino yolimbana ndi ming'alu ndipo ndiyoyenera kutsutsa zotsutsana ndi ntchito yomanga.
RDPamapangidwa ndi akatembenuka emulsion polima kukhala ufa kudzera mwa njira zamakono. Ili ndi zinthu zambiri zabwino kwambiri ndipo imagwiritsidwa ntchito kwambiri pomanga, zokutira, zomatira ndi zina. Kusankhidwa ndi kuchuluka kwa zosakaniza zake zimakhudza mwachindunji ntchito yake yomaliza.
Nthawi yotumiza: Mar-11-2025