| 配方类型： |
ADHESIVES |
| 配方说明： |
Emulsion-Type Adhesive ( |
| 配方组成： |
In the adhesive field, as in the case of many other industries, the
latex or emulsion adhesive that can be thinned with water is rapidly
gaining wide-spread recognition. The majority of these compounds are
based on high molecular weight resins that have been polymerized in a
water medium. Here, too, "Neville" Resins can be used to great
advantage. Their inherent tackiness improves the initial adhesion and
also aids in prolonging the tack life of the adhesive film. Their trial
is strongly recommended to those who are actively engaged in or planning
on producting latex adhesives.
It is necessary that the highly hydrophobic "Neville" resins be
emulsified or made water miscible so that they need only be stirred
into the latex adhesive. The following emulsification information is
given to this end.
If a hydrocarbon solvent, such as toluene, mineral spirits, etc., can be
tolerated in the adhesive formulation, then the emulsification of the
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| 配制方法： |
Initially, the resin is dissolved in the solvent. The oleic acid and triethanolamine are then added to the resin solution and mixed until uniform using an "Eppenbach Homomixer," "Cowles Dissolver," or some other high-speed mixer. The water is then added in small portions under high speed mixing. Initially, a water-in-oil emulsion is formed with a noticeable increase in viscosity. However, with the continued addition of water, the emulsion will reach a maximum in viscosity and invert to an oil-in-water type with some decrease in viscosity. After inversion, the remainder of the water can be added more rapidly. This emulsion is water dispersible and can be further reduced with water to any desired solids concentration.
In general, the majority of "neville" resins can be emulsified in this fashion. Of course, the "neville" resin being emulsified should be completely soluble in the organic solvent used in the formulation.
Another method of emulsifying a high melting "neville" resin (in solution) is shown |
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