Long-lasting waterproof treatment of the carton surface

The so-called permanent water repellent treatment is a treatment method according to JIS Z 1537-1989: "Almost impermeable to water even when exposed to water for a long time."

In China, for a long time, the waterproof treatment of cartons is based on this approach. The carton is hand-painted with a waterproofing agent that is bright, strong, and has good water resistance and does not collapse after brushing. This type of water repellent is often solvent-based (or oily). It has a large physical damage to the operator and causes pollution to the environment. It is also unfavorable for the recycling of cartons and has rarely been used in recent years. Replaced by water-based or emulsion-type waterproof coatings.

Aqueous emulsion waterproof coating can reach the requirement of being in contact with water for a long time and it is almost impervious to water. However, when the paint is applied by hand, if the paint contains a lot of water and the natural drying time is long, it will easily cause collapse or separation of the paper and the corrugated medium. . To solve these problems, the first coating has a high non-volatile content, and the second one can be suitably added with a non-toxic water-soluble volatile solvent to accelerate the evaporation speed of the water. The third is to change the way of manual brushing and use the method of machine coating and drying for production.

Corrugated board drying molding temperature is generally around 150 °C, and some up to 180 °C, general thermoplastic polymer coating is already sticky at this temperature, coated with this coating of paper is often sticky when passing on a hot plate , pull the paper and even pull the surface.

A corrugated cardboard waterproof coating can overcome this shortcoming. This coating is a combination of a polymer emulsion and a wax emulsion. The polymer emulsion has good film forming property and water resistance, and the particle size of the emulsion is finer than that of the wax emulsion. After coating, the permeability to paper is stronger than that of the wax emulsion because of its poor compatibility with the wax. After the film is formed, the wax is precipitated from the polymer film, and most of the wax particles that are blocked by the paper fiber float on the surface fiber of the paper.

When the corrugated paperboard is shaped into a heating plate, the phenomenon of stickiness on the paper surface is reduced due to the effect of the wax, and the paper surface will not be napped. At the same time, the polymer film will not be scratched under the protection of the wax, so that Cardboard can have a long-lasting waterproof effect. This coating also solves the problem of low efficiency of hand painting. At the same time, due to the presence of wax, it also acts as a matting agent, keeping the cardboard in its true colors. This type of paint is a water emulsion type, and the use of water-based inks for printing does not cause ink sticking. Finally, it must be pointed out that the main resin in this polymer emulsion is easily hydrolyzed by alkali, which is also convenient for paper recycling.

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