Corrosion resistance and flame retardancy of particleboard and fiberboard

Corrosion resistance and flame retardancy of particleboard and fiberboard

1 Corrosion Resistance

The ability of particleboard and fiberboard to resist the erosion of insects and fungi is called corrosion resistance. It is expressed as a percentage of mass loss.

The corrosion resistance of particleboard and fiberboard depends on the types of adhesives, wood and destroyers. The board made of protein adhesives has the worst corrosion resistance; the board made of urea-formaldehyde resin contains a certain amount of free formaldehyde, which is stronger than wood; the board made of phenolic resin particleboard and fiberboard contains a small amount of free phenol, which is more toxic, so the board has a higher corrosion resistance. Some species, such as Larch and cypress, have strong rot resistance, while others, such as white pine and birch, have poor rot resistance. Therefore, different species are used to make particleboard and fiberboard, and the rot resistance of board is also different. In order to improve the anti-corrosion performance of particleboard and fiberboard, preservatives can be added in the production process. According to the experiment, the quality loss rate of particleboard without preservative is 31% – 48%, while that of board with preservative is only 1%.

2 Flame Retardant

As a high-rise building, hospital, nursing home, nursery and bus, ship particleboard and fiberboard, it should have good flame retardant performance.

Flame retardancy of particleboard and fiberboard refers to its fire resistance. The flame retardancy of the sheet can be evaluated by testing the percentage of mass loss of the sheet. The calculation formula is as follows:

Formula G – percentage of mass loss of refractory specimens (%);

M0 – the quality of the specimen before the experiment (g);

M1 – Quality (g) of specimens after refractory test.

The flame retardancy of materials, also known as flame retardancy, is divided into three grades: flammable, non-flammable and non-flammable materials. Wood materials belong to flammable materials. Because particleboard and fiberboard contain adhesives, their flame retardancy is higher than wood, but they are still flammable materials. The flame retardant property of the board can be greatly improved by adding fire retardant or treating the board surface with fire retardant in the process of making the board. For example, the medium density fiberboard produced by using ZR-01 resin as carrier WFR flame retardant not only meets the national technical requirements for flame retardant properties of building materials, but also has little impact on the physical and mechanical properties of products after adding flame retardant (see Table 1-12). The oxygen index of the flame retardant property of the MDF is more than 45%. The carbonization length of the MDF is 12 cm after the flame is ignited vertically for 15 minutes at 1000 C. The flame retardant time is less than 2 seconds and the smoke grade is one grade.

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