无表面活性剂疏水添加剂在增强防水性能方面的进展.pdf

1、ENHANCEDHYDROPHOBICITYSURFACTANT FREEMICROEMULSIONS1Cody LindemulderSales,Business Development andTechnical Support ManagerCHT USA805 Wolfe AvenueCassopolis,MI.49031Mobile:+1(269)666-4377cody.lindemulderCHT.com About Me Emulsion Basics Understanding SurfactantsBasicsTypesHLB SystemUsage Levels Intro

2、 to Amine Modified PDMS Amino Siloxane Microemulsions Application Testing Data Review2COMPANY CONFIDENTIALCODY LINDEMULDERsurfactantmoleculeH2OOil-in-Water Emulsion(O/W)Emulsion:A dispersion of one immiscible liquid in another,usually stabilized by a surface active agent.Surfactant:A substance which

3、 tends to reduce the surface tension of a liquid in which it is dissolved.oilEmulsion BasicsMicroemulsions:1m100 nm =0.1 m0.010.1110100Particle Size(nanometers;nm)10010001010,000100,000Particle Size(micrometers,m)Coarse Emulsion:0.3m to 1 mEmulsion Classification by Particle SizeEMULSIONS:HYDROPHILI

4、C CHARACTER6Surfactants are amphipathic compounds.Meaning they have and affinity for both water and oil.Surfactant molecules have polar“head”groups and nonpolar“tails”chains.Surfactants accumulate at interfaces(air/water and oil/water interface)There are three main types of surfactants:Nonionic,Cati

5、onic,and AnionicSurfactant BasicsInterfaceWaterOil or Airanionicnonioniccationic+-ClNCH3CH3CH3OSOOO-+Na(OCH2CH2)n-OHpolymericH-(OCH2CH2)m-(OCH2CH)n-(OCH2CH2)m-OHCH3C12C16C12amphotericNHOHC2H5OTypes of SurfactantHLB=“Hydrophile-Lipophile Balance”Used for identifying emulsifiers for mechanical emulsio

6、ns Numerical scale to describe extent of hydrophilicity oleic acid 1.0 potassium oleate=20.0 Most nonionic surfactants fall between 1-20 Every oil has a“required HLB”Surfactants The HLB SystemWater Solubility and HLB RelationshipHLB:0 3No dispersibility in waterHLB:3 6Poor dispersibilityHLB:6 8Some