What is Foam?
Foam is a coarse dispersion of a gas in a liquid, where the volume fraction of gas is greater than that of the liquid. The bubbles will migrate to the surface, as their density is less than that of the liquid. As the bubbles coalesce and collect at the air/surface interface, the bubble walls thin and break.
In industrial processes, foams pose serious problems. They cause defects on surface coatings. They prevent the efficient filling of containers. Some of the sources of foam formation include:
- Inclusion of air through agitation during production, filling, mixing of two-pack systems (often high-viscosity (epoxies, adhesives);
- Air inclusion on the pigment surface, resulting in poor wetting of pigments;
- Application: roller, spraying, brushing;
- Filtration through a sieve or anything with air on the surface;
- Generation/liberation of gases during chemical curing processes; e.g. polyisocyanates;
- Introduction of air through substrate wetting (wood coatings, other highly porous substrates).
In the papermaking process, fibers, fillers and some additives are not water-insoluble, so they are easy to accumulate in an aqueous solution. Moreover between the different materials as far as possible from the incompatibility away, so it is difficult to get uniform performance and ideal strengthen paper. In order to solve the long fiber in the process of this problem, the use of
- to improve the retention rate of fillers, pigments and so on. To reduce the loss of raw materials and environmental pollution.
- to improve the strength of the paper (including dry and wet strength).
- to improve the tear resistance and porosity to improve visual and printing performance.
Epoxy propanol (EP), also known as glycidol, is an organic compound used in the manufacture of a range of products, such as detergents, industrial paints and coatings, and healthcare products. It is primarily manufactured in Japan and, to a much lesser degree, in the United States. Traditionally, EP is produced by one of two methods: epoxidation of allyl alcohol with hydrogen peroxide, or the reaction of