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With the rapid development of science and technology and the continuous improvement of people’s living standards, higher requirements have been placed on WPC, which not only requires materials to have good decorative effects, but also requires materials to be cost-effective. In order to meet these needs of consumers, WPC It will develop in the direction of high functionality and intelligence. Plastic wood itself does not have the characteristics of high functionality and intelligence, but an appropriate amount of functional pigments can be added to the material matrix to make plastic wood composite have certain special functions, such as anti-fouling, anti-mildew, fire prevention, temperature display and luminescence, etc. special function.
Through the analysis of the source of materials, process parameters and use environmental conditions of plastic wood composite, it is found that plastic wood composite, as a new type of composite material, has a variety of materials, difficult control of process parameters, and harsh use environment, resulting in a single product color, which not only affects consumers’ choices space, and to a certain extent limits the development of the plastic wood industry. In order to improve the above shortcomings, it is improved by adding pigments to the plastic wood composite matrix or coating the surface of the material with colored plastics. Adding pigments to the plastic wood composite matrix is simple, easy to operate, and low in production cost, so this method is widely used. At present, in the production of plastic wood composite, the pigments used include organic pigments, inorganic pigments and functional pigments. At the same time, a small amount of light stabilizers and antioxidants are added to improve the weather resistance of the material.
At present, there are relatively few studies on the application of functional pigments to plastic wood composite, which has a great development prospect. Scientists and technicians added the color-changing capsules to the bamboo powder/plastic composite material, and successfully prepared the reversible thermochromic plastic wood composite. At the same time, the mechanical properties, physical properties, rheological properties, temperature and light response and thermal properties of the material were studied. However, functional pigments are relatively expensive compared to organic and inorganic pigments, and they are more sensitive to environmental changes, which limits their application in plastic wood composite to a certain extent. In order to realize the functionalization and intelligentization of plastic wood composite, it is necessary to strengthen the research and development of non-toxic or low-toxic, environmentally friendly functional pigments, while ensuring the functionality of the materials, minimize the production cost of functional pigments.
Studies have found that by adding functional pigments to the plastic wood composite matrix, not only will not cause significant damage to the strength of the plastic wood composite, but also has a good decorative effect, environmental protection and low or non-toxic to humans, allowing the material to have certain special functions , which enhances the added value of materials and promotes the development of the plastic wood industry towards functionalization and intelligence.