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Reasons of the paint industry foaming

Date:2014年8月4日 08:50

With the continuous development of science and technology, people on the coatings industry made ​​high-quality, high-efficiency requirements. That water-based paints, solvent-based coatings, should be used in the formulation of various additives, which help disperse pigment wetting additives; has improved storage stability of the finished coating additives, to adjust the appearance of flat paint additives; there some reached aids special functions. Most of these species belong to the coating auxiliary surfactant, can alter the surface tension of the coating, causing the coating itself there foaming the foam stability, or internal factors.

     Paint manufacturing process requires the use of a variety of high-speed mixer, such as a three-roll mill, a sand mill and a ball mill. Ways and means used during paint coating, such as air spray, airless spray, roller coating, flow coating, and curtain coating and the like. In these processes will increase the degree of freedom in different coating systems can help produce a foam, which foam is produced by external factors.

     Waterborne coatings industry bubble latex paint is the most prominent, which is due to its special formula and special production process.

     (1), A latex emulsion of water as a diluent must be used when a certain amount of emulsifier, to the preparation of a stable aqueous dispersion. Emulsifier used, resulting in greatly reduced surface tension of the emulsion system, which is the main cause of the foam.

     (2)Latex dispersed pigment wetting and dispersing agent is to reduce the surface tension of the material system, and help to generate stable foam.

     (3)A low viscosity is not easy to paint and construction, so that after the foam thickener thickening of the membrane wall to increase its flexibility, stable and easy to eliminate the foam.

     (4) Extracting the free monomer emulsion production; paint during the preparation of dispersion adjustment and mixing; sprayed on the construction process, a brush, roller or the like operation. All of these different degrees of freedom can change the energy of the system, to promote foaming. Latex foam problem, so that production operations difficult, the air bubbles will not only hinder the dispersion of pigment or filler, but also the lack of equipment utilization and yield; canning due to foam when required repeatedly filling. Construction bubble caused to the film surface defects left, both lossy appearance, but also affect the film's corrosion resistance and weather resistance.

     In short, water-based paint has been very let bubble production and user headaches, here to talk about the first generation of bubbles and stability, simply say that the lower the surface tension, the system free energy required to form a bubble smaller, more prone foam. But such is not necessarily a very stable foam, comprising the system only when the elastic film to form surface-active substances, such as: dispersants, thickeners, leveling agents, to stabilize the foam.

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