What effect does glue have on multilayer boards?

 The production of artificial boards is inseparable from adhesives, and the environmental protection level of the glue directly affects the environmental protection level of the finished board. Taking multi-layer boards as an example, what effects do different glues have on the boards?

The glue for artificial boards has a history of thousands of years in China. From the original bone glue to the later urea-formaldehyde glue, after generations of continuous research, the bonding strength of the glue has been continuously improved, but the side effects that come with it are also increasing.

Taking the board adhesives currently on the market as an example, different glues have completely different effects on the quality of artificial boards.

First, urea-formaldehyde adhesive, the cheapest and most polluting adhesive on the market, is formed through a chemical reaction between formaldehyde and urea. Initially, the ratio of formaldehyde to urea is approximately 3:7 or even lower. While low formaldehyde levels contribute less to environmental pollution, they also reduce the board's bonding strength. Therefore, some companies and businesses increase the formaldehyde content by increasing the formaldehyde ratio, which enhances bonding strength while significantly reducing the environmental rating of the artificial board.

Taking multi-layer boards as an example, after being produced using high-quality veneers and highly polluting urea-formaldehyde glue, their environmental protection level cannot reach the E1 level at all, that is, it cannot reach the current lowest level.

Not only urea-formaldehyde glue, but also phenol-formaldehyde glue and melamine glue, which are collectively known as trialdehyde glue, will reduce the environmental protection level of the board and become a source of pollution to the indoor environment.

To address this problem, protein glue has emerged on the market. Soy protein glue is made from edible-grade soy flour and water, physically blended. It contains no harmful substances like formaldehyde or benzene, and during production, it neutralizes some of the formaldehyde content in the wood itself, significantly improving the environmental performance of the finished multi-layer board. It can achieve CARB-certified NAF levels, the highest internationally. Currently, domestically produced formaldehyde-free multi-layer boards are known to be the most advanced.

As for other glues on the market such as MDI, after being used in the production of multi-layer boards, they can lead the multi-layer boards to reach E0 grade. The E0 grade standard is: formaldehyde emission is less than or equal to 0.5 mg/L. According to scientific surveys, when the indoor E0 grade is used too much, it will cause the indoor formaldehyde to exceed the standard.

Different glues have different effects on multi-layer boards or other man-made boards. Merchants and home improvement friends can inquire about the type of adhesive used when using the boards, so as to judge the environmental protection level of the boards, and also analyze whether using them in indoor home life will cause formaldehyde to exceed the standard.

Should you use highly polluting boards that harm your family’s health, or choose environmentally friendly boards to purify indoor formaldehyde?