Factors that affect the debling of water-based wood coatings

Zeng Thickener
In the production of water-high viscosity matte varnishes, the choice of thickeners is very important, which is the key to the de-foaming of the product during storage or construction. At present, there are two main types of thickeners commonly used: the connective type and the alkali-soluble type. The former can provide better leveling and shear viscosity, while the latter can improve better storage stability and anti-flow

. In production, the former is conducive to de-foaming and de-foaming, while the latter is easier to stabilize. However, because the former has better mobility, so that its anti-pollution capacity in the construction is greatly reduced, therefore, in order to maintain the stability of the storage of paint, construction has a better anti-flow hanging and anti-pollution capacity, water-based matte varnish even at a higher viscosity sometimes have to be used with a certain alkali-soluble thickener. There are many kinds of thickeners in both types, how to match, depending on the results of the experiment after the resin is selected.
anti-light powder, wetting dispersant
in the water-like matte varnish sprayed with medium pressure mixing, the general choice of matte powder as a light-relief agent, rather than the use of anti-light wax paste. This is mainly due to the medium pressure mixing spray on the plate feel requirements are not very high, at the same time, but also take into account deblistering, price, system thickening and other reasons. The price of using anti-light wax slurry (powder) is relatively high, and foam is easy to foam when dispersed and difficult to eliminate.
in high-viscosity varnishes, the anti-sinking of the anti-light powder is almost non-considered, but the effect on de-foaming becomes very important. Generally speaking, the surface is hydration treatment than unprocessed easy deblistering, small oil absorption than oil absorption is larger than easy deblistering. Experiments show that the selection of different wetting dispersants has a great impact on the de-foaming of the system, the dispersant on the surface of the anti-light powder wetting the better, the more conducive to the system de-foaming.
and control of the production process
in the production of coatings, the design and control of the process is also very important. In the production of water-based coatings, in order to mix resins and other components evenly and minimize real estate bubbles, it is necessary to develop a suitable production process and strictly control it. For example: in the production of matte varnish, generally in the resin after the addition of additives and anti-light powder high-speed dispersion to the required fineness, in this process, will produce a large number of bubbles, in the low viscosity, generally these bubbles will be removed after 24h, but when the viscosity is high, the system is strong, these foams are difficult to remove for a long time. At this time, the light powder is made into pulp and added, it can effectively reduce the production of foam. On the other hand, when adding destication agents or other non-dispersive additives, it is best to dilute them and slowly add them in the dispersion state, in order to minimize the speed required for dispersion and reduce the time of dispersion uniform;
Water-based wood coating high viscosity construction can improve the thickness of one-time construction to improve production efficiency, but also reduce the possibility of hanging and foaming during construction, but it increases the difficulty of de-foaming during construction, greatly affecting the board effect after construction has become a major obstacle to the expansion of water-based wood coating to other applications. In the study of de-foaming of water-based high-viscosity varnishes, the choice of resin and thickener is the most important second is the selection of desiccant, anti-light powder and other additives, and finally the optimization of the production process and the adjustment of viscosity. A good product not only must have a good materialization performance, but also have a good construction performance, only the two well combined, in order to show excellent coating effect, to meet consumer requirements, water-based wood coating development will be more rapid.
。