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Wood plastic co-extrusion flooring is the most important type of co-extrusion wood plastic materials, accounting for more than 90%. Specially researched and developed co-extruded plastic wood materials designed for outdoor use. Initially, they were upgraded from ordinary wood plastic materials. Later, as the technology became more adept and advanced, more types of subdivided products evolved.
For co-extruded wood plastic materials, as a major development highlight of wood plastic co-extrusion flooring, it is a better solution to the color problem. The original ordinary wood plastic materials generally have problems such as obvious fading and relatively simple and simple color.
Why is the color of the original ordinary wood plastic material more monotonous and plain? Of course, it is not to say that it cannot be made colorful or bright and moving. It can also be achieved through the choice of pigments. However, due to the natural microstructure of ordinary wood plastic materials, the bright and moving colors are even more faded.
From the chemical point of view, pigments can be divided into two categories: inorganic pigments and organic pigments. These two categories have two very obvious characteristics when used in ordinary wood plastic materials and co-extruded wood plastic materials. In the case of inorganic pigments, the color is simple and monotonous, but it has good weather resistance and strong UV resistance. In the case of inorganic pigments, the colors are bright and moving, but the weather resistance is slightly poor, especially the ordinary wood plastic materials, which have poor UV resistance and serious color fading.
Since ordinary wood plastic materials are homogeneous composite materials, the surface layer is the same as the core layer material. The pigment is evenly dispersed in the material, and also evenly dispersed on the surface of the material, so the sun's ultraviolet rays can directly reach the surface and affect the working performance of the pigment. As an inorganic pigment, its structure is non-extremely small molecules, and ultraviolet radiation will basically not cause any damage to its molecular structure, so it is difficult to have much effect on its apparent color. Therefore, most of the colors of inorganic pigments for ordinary wood plastic materials Relatively stable, good weather resistance, of course, less fading performance. This is normal. This is a phenomenon manifested by the loss of pigment molecules on the surface of the material. When the material and the surrounding environment become balanced, the color can remain stable for a long time. This process is roughly there are three months.
Organic pigments are different. Its molecular structure is easily damaged by ultraviolet radiation and decomposes. The surface color change is manifested. And because wood powder accounts for a relatively large proportion of ordinary wood plastic materials, wood powder cannot affect organic pigment molecules. Effective anti-ultraviolet protection, so when ordinary wood plastic materials use organic pigments, the color fading is serious. Nowadays, organic pigments are rarely seen in the market to produce ordinary wood plastic materials.
Unlike wood plastic co-extrusion materials, wood plastic co-extrusion flooring, as a high-end outdoor floor, must focus on this issue. Wood plastic co-extrusion materials are divided into a double-layer structure, a core layer and a co-extrusion layer. The co-extrusion layer generally adopts plastic modification methods to obtain the co-extrusion layer formula composition according to the target performance requirements. At the beginning, when the formulation technology and production technology of wood plastic co-extrusion materials were relatively weak, in order to consider long-term use, most manufacturers still start from the most durable inorganic pigments for color matching of wood plastic co-extrusion materials. Nowadays, most of the wood plastic co-extruded floors on the market have their colors adjusted with inorganic pigments.
However, with the large-scale promotion and application of wood plastic co-extrusion materials in the past two years, the production technology and product formulation technology have become more and more adept. The gradual use of plastic modification technology and the bold introduction of organic pigments are inevitable for market development. Organic pigments can enrich the color gamut of products that can be produced and debugged, and can make the target effect more adjustable and expandable. This is a very personalized performance. Of course, the premise is that the improvement of production technology and product formulation technology has been enough to offset the damage of organic pigment molecules on the surface of direct ultraviolet rays.
Through the above-mentioned the consideration of the selection of the pigment part in the production formula of the co-extruded wood plastic material corresponding to the wood plastic co-extrusion floor, I believe that the pigments produced in the wood plastic industry will be bright and beautiful in the future, will not fade, and can resist ultraviolet rays.