Adhesives used in making particleboard can generally be divided into two categories: 1. Protein glue: It can also be divided into animal protein glue, such as blood glue, casein glue, etc., and plant protein glue, such as soybean glue, etc. However, this type of glue has poor water resistance, insect resistance, and corrosion resistance. Among this type of glue, blood glue has better quality, and its bonding strength and water resistance are better than other protein glues. However, blood glue is darker in color, which affects the appearance of the product. It has an odor and is easily corroded by fungi. Therefore, protein glues are not commonly used at present. The advantages of this type of glue are low raw material prices, simple glue-making equipment, and easy preparation and use. 2. Synthetic resin glue: There are two types of urea-formaldehyde resin glue and phenolic resin glue currently used, but urea-formaldehyde resin glue is the main one. Their bonding strength and waterproof performance are better than protein glue, and the particleboard produced is of good quality and high strength. Phenolic resin glue has the advantages of high bonding strength, good water resistance, heat resistance, high chemical stability, and is not corroded by bacteria and insects. The disadvantage is that it is darker in color and more expensive. This type of glue is typically used to make particleboard for outdoor use. Although the bonding strength and water resistance of urea-formaldehyde resin glue are not as good as phenolic resin glue, it is better than protein glue. It also has the advantages of higher bonding strength, moisture resistance, water resistance, and corrosion resistance. It is also light-resistant, lightweight, and The particleboard produced has the characteristics of light color and can maintain the original color of the wood, making the board surface beautiful in color. It is a good adhesive for making indoor materials. The so-called glue amount (that is, the amount of glue applied) refers to the percentage of the solid weight of the glue and the weight of the absolutely dry shavings. The amount of glue applied is related to the nature of the glue, the purpose of the particleboard, the tree species of the shavings and production loss factors. Particleboards with high grade, heavy bulk and good physical and mechanical properties require a larger amount of glue than particleboards with lower grade, small bulk density and poor physical and mechanical properties. Different tree species are used, and the amount of glue used is also different. The amount of glue used in broadleaf wood is 10% higher than that of coniferous wood. The generally used resin glue dosage is: 8-12% for single-layer boards, 6-8% for the core layer of three-layer structural boards, 10-12% for the surface layer, and the average glue dosage for gradient structural boards is 8-10 %.