The raw materials for the production of wood-plastic products mainly fall into the following two categories:
First, wood fiber materials
1. Wood flour
Wood flour is one of the most common wood fiber materials. It can be made from sawdust and wood chips produced in the process of wood processing. Wood powder of different tree species will vary in color, texture and performance, and can be selected according to product needs.
The particle size of wood powder has a certain effect on the performance of wood plastic products. Generally speaking, the finer wood powder can make the surface of the product smoother, but it may reduce the strength of the product; Coarser wood flour can increase the strength of the product, but the surface may be relatively rough.
2. Plant fiber
In addition to wood flour, other plant fibers can also be used as raw materials, such as rice husks, straw, bamboo powder, etc. These plant fibers come from a wide range of sources, the price is relatively low, and they also have good environmental performance.
Different plant fibers also differ in their properties. For example, bamboo powder has high strength and hardness, while straw is relatively soft. When selecting plant fiber, it is necessary to consider its compatibility with plastics and its impact on the performance of the product.
Second, plastic materials
1. Polyethylene (PE)
Polyethylene is one of the commonly used plastic materials in wood plastic products. It has good corrosion resistance, low temperature resistance and processing performance. According to the different density, polyethylene can be divided into high density polyethylene (HDPE), low density polyethylene (LDPE) and linear low density polyethylene (LLDPE).
HDPE has high strength and hardness, which is suitable for the production of wood-plastic products with high strength requirements; LDPE and LLDPE have better flexibility and impact resistance, and are suitable for the production of products requiring a certain degree of elasticity.
2. Polypropylene (PP)
Polypropylene is also a commonly used plastic material. It has high heat resistance, chemical resistance and strength. Compared with polyethylene, polypropylene is harder and more rigid, but slightly less flexible.
Polypropylene can be improved by adding different additives, such as tougheners, flame retardants, etc., to meet the needs of different applications.
3. Polyvinyl chloride (PVC)
Polyvinyl chloride has good corrosion resistance, flame retardant and processing properties. In wood-plastic products, PVC is mainly used in the production of outdoor building materials, such as wood-plastic flooring, wallboard and so on.
Due to the chlorine contained in PVC, it may have a certain impact on the environment during production and use. Therefore, when choosing PVC as a raw material, it is necessary to consider its environmental performance.
In addition, in order to improve the performance of wood-plastic products, some additives can also be added, such as lubricants, stabilizers, antioxidants, pigments and so on. These auxiliaries can improve the processing performance, stability and appearance quality of the product.
