| 配方類型： |
ADHESIVES |
| 配方說明： |
Emulsion-Type Adhesive ( |
| 配方組成： |
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 < |
| 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 |
|
