Emulsifiers, emollients and solubilizers for personal care. These products are designed to deliver high performance to clear and pigmented coatings on a variety of substrates like wood, concrete, plastic, and metal. Basic emulsion chemistry aema asphalt emulsion technologies workshop november 14, 2011 andrew bickford asphalt innovations meadwestvaco. Required hlb determination of some pharmaceutical oils in submicron emulsions article pdf available in journal of dispersion science and technology 336. In this test the emulsion is diluted either with oil or water. C value mg amine fatty acid peroxide matter % system wax comp kohg wt % wt %onent 20 c chemrez 25 styrene acrylic resin 25 8. Hlb critico wo owacid, stearic 6 15alcohol, cetyl 15alcohol, stearyl 14lanolin, anhydrous 8 10oil, cottonseed 5 10oil, mineral 5 12petrolatum 5 12wax, beeswax 4 12 9. Emulsions notes free download as powerpoint presentation.
The higher the hlb the greater its emulsifying ability. Scribd is the worlds largest social reading and publishing site. The asphalt institute ai and the asphalt emulsion manufacturers association aema are pleased to offer the 4th edition of ms19, the basic asphalt emulsion manual. The pit should be at least 20 c higher than the storage temperature. Hlb the easiest way to create an emulsion by kelly dobos as a cosmetic chemist you will undoubtedly be asked to make products that require you to combine materials that arent easily compatible.
Balance hidrofilicolipofilico hlb del colesterol y sus. If the emulsion is ow type and it is diluted with water, it will remain stable as water is the dispersion medium but if it is diluted with oil, the emulsion will break as oil and water are not miscible with each other. Following is a list of hlb values for these products. The hlb system formulating an emulsion emulsions are one of the most common forms of cosmetic products an emulsion is a dispersion of two or more immiscible materials where one phase internal is dispersed in the continuous external phase. The hlb scale devised by griffin in 1949 is a scale from 0 20 20 being hydrophilic used to characterise the nature of surfactants and balance their proportions in order to stabilise disperse systems.
Emulsion type is often related to the preferential solubility of the emulsifying agent in one of the phases bancroft rule. C to ease startup do when a pump is to be out of service for even a short period of time, fill it with fuel oil to ensure a trouble free startup. Revised february 3, 1969 the properties of emulsions containing 3 wt% of polyoxyethylene nonylphenyl ether per system. Hlb values of akzo nobel fatty amines and derivatives accuracy. W is the free energy of the interface and corresponds to the reversible work brought permanently into the system during the emulsification process. Las emulsiones ow y wo son las mas simples, casi sistemas ideales. The change in free energy in going from state i to state ii is made from two contributions. The diverse products in our portfolio allow the coatings. Measures the degree to which the emulsifier is hydrophilic or lipophilic. Wax base nonvolatile emulsifier ph value acid free free hydrogen rie matter % system 20. Cosmetic emulsions emulsions are one of the most common forms of cosmetic products. Sherman1 unilever research laboratory colworthwelwyn, welwyn, hertfordshire, england received october 11, 1971. Do use a mild heating method to apply heat to the pump packing or casing to free a seized pump.
The relation of hlb numbers to the solubility of the emulsifying agent in the oil or water phases is. Pdf required hlb determination of some pharmaceutical. Recently, however, emulsion type has been interpreted quantitatively, though purely empirically, according to the hydrophiliclipophilic balance hlb classification. The force causing each material to resist breaking up into smaller particles is called interfacial tension. Fortunately, there is a system that can help you get started. The hydrophiliclipophilic balance of a surfactant is a measure of the degree to which it is hydrophilic or lipophilic, determined by calculating values for the different regions of the molecule, as described by griffin in 1949 and 1954. Understanding emulsions and emulsifiers brief overview. Factors affecting emulsion stability, and the hlb concept. The stability of ow type emulsions as functions of temperature and the hlb of emulsifiers. At this temperature the emulsion will exhibit a phase inversion. The stability of ow type emulsions as functions of. The conclusion is straightforward that ultimate stability against. Effective factors on the stability of oilinwater emulsion.
As a result, it will be an important parameter in determining the chemical and physical stability of oilinwater emulsion. There is a temperature pit at which the hydrophilic and lipophilic characteristics of the emulsifier are equal relative to the required hlb of the oil phase. The hlb hydrophiliclipophilic balance of an emulsifier is also very important to help determine how effective it will be for each formulation. Hlb hydrophilelipophile balance values close to that required of the oil phase aulton, 1995. The hlb system importance of lowest interfacial tension when two immiscible materials are placed in contact, an interface results. The emulsification by pitmethod kozo shinoda and hiroshi saito department of chemistry, yokohama national university, ookamachi, minamiku, yokohama, japan received december 2, 1968.
Beeswax this weak emulsifier can be naturally harvested from bees. To disperse two immiscible liquids, one needs a third component, namely, the emulsi. In chapter 3, the effect of surfactant content, water content, hlb value, alcohol content. Emulsifiers with hlb values hlb values sorted by hlb from lowest to highest. Solubilizers peg free emulsifiers product inci hlb aspect at 25c kotilenl1 polysorbate 20 16.
An addition of an emulsifier s lowers the interfacial tension making two materials miscible. Determination of the required hlb values of some essential oils. In the culinary arts, an emulsion is a mixture of two liquids that would ordinarily not mix together, like oil and vinegar. Increasing the packaging degree at the interface also decreases the surface energy. Emulsion article about emulsion by the free dictionary. Theviscosity ofthe emulsion decreaseswith the hlb number and increases with oil content in the mixture.
The akzo nobel fatty amine products have surfactant properties that can offer emulsifing properties. The hydrophileliphophile balance hlb of cholesterol and its applications in emulsions of the oil in water type. Revised february 3, 1969 the properties of emulsions containing 3 wt% of polyoxyethylene nonylphenyl ether. Hlb balance hlb stands for hydrophilic lipophilic balance. Basf offers a wide range of joncryl acrylic polymer emulsions for 1component 1k and 2component 2k coatings systems. Factors affecting emulsion stability, and the hlb concept j. Pdf balance hidrofilicolipofilico hlb del colesterol y sus. This makes an emulsion very prone to coalescence processes which lead to a decrease in. Emulsion properties of mixed tween20span20 in nonaqueoussystem. Emulsion properties of mixed tween20span20in nonaqueoussystem significantly after storage for one week. An example of a temporary emulsion is a simple vinaigrette while mayonnaise is a permanent emulsion. New edition of ms19 basic asphalt emulsion manual now. This is the industrys key publication for explaining the characteristics of asphalt emulsions and their uses. Curso surfactantes y emulsiones usaca emulsion tensioactivo.1517 73 180 669 962 1127 1333 1416 70 501 720 1550 442 921 185 1002 322 834 870 27 324 1072 313 231 498 1222 262 38 372 222 1148 489 1379 1111 732 225 387 1211 15