使用非离子反应性表面活性剂提高纯丙烯酸乳液的耐水性.pdf

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1、Improving Water Resistance of Pure Acrylic Emulsions with Nonionic Reactive SurfactantsIntroductionCaseWrap up123COATINGS SUSTAINABILITYI.Reduce environmental impacts.II.Efficient use of resourcesIII.Increased durability of materialsWaterborne CoatingsEFFECT OF WATER-SOLUBLE SPECIES ON PERFORMANCE O

2、F WATERBORNE PAINTWater resistance DurabilityStabilityShelf-lifeWHY DOES IT HAPPEN?Emulsion PolymerSTAGE ISTAGE IISTAGE IIIFragile FilmContinuous and Transparent FilmCoalesced FilmTMFFTTTgWHY DOES IT HAPPEN?HOW TO IMPROVEWATERRESISTANCE?Case 2WATERDIFFUSIONWATERDIFFUSIONWater ResistanceWashedFree-Su

3、rfactantFree-SurfactantVanderhoff et.Al.,J.Pol.Sci.1973,41,155-174.SurfactantmigrationWaterresistance Conventional surfactantsReactive surfactantsOOCH3HnOOCH2HnSTRATEGYALL-ACRYLIC LATEXADVANTAGES Tg Mechanical Properties UV-resistance Hydrolytic resistance Oil resistanceMMATg 105CBATg -54C Interior

4、Exterior paintsALL-ACRYLIC LATEXDISADVANTAGEAll-AcrylicStyreneAcrylic99 wt.%LiquidHLB of 15Compatible with all latexesAirWaterBehave as conventional surfactantsREACT N1MONOMERSSC 10 wt%40-50 nm1 STEP:Generation of seeds Asua et.Al.,Langmuir 2003,19,3212-3221.MONOMERSSC 45-50 wt%100 nm1018seeds/L2 ST

5、EP:Growth of seedsCH2AOOHmnOOSCH3OOOnNa+OOSCH3OOOnNa+TWO STEP PROCESSEmulsion Polymerization SEEDED SEMI-BATCH PROCESS*Sodium salt of lauryl ether sulfateStarting FormulationsSeedsComponentsw/wEmulsion Polymer seed(Previously prepared)Methyl Methacrylate(MMA)0.75Butyl acrylate(BA)0.72Methacrylic aci

6、d0.03Anionic surfactant*0.38Ammonium persulfate0.004Pre-emulsionMethyl Methacrylate(MMA)23Butyl acrylate(BA)22Methacrylic acid1Anionic surfactant*TBDREACT N1TBDThermal InitiatorAmmonium persulfate0.15Ox-redoxInitiatorOxidizing Agent0.02Reducing Agent0.02EFFECT OF SURFACTANT COMPOSITION ON COAGULUM F