Wood-plastic composite materials have been closely related to people's lives and are loved by everyone. In recent years, people's demand for PVC plastic-wood composite materials has increased year by year. Compared with other wood-plastic composite materials, it has been widely used in interior decoration and furniture fields because of its better appearance and better flame retardancy. However, because PVC plastic wood composite materials are accompanied by a large amount of toxic smoke when burning, it is more likely to cause casualties in the event of a fire. Therefore, it is particularly important to improve the flame retardant and smoke suppression properties of PVC wood-plastic composite materials. The preparation of high-efficiency flame-retardant and smoke-suppressing PVC-based wood-plastic composite materials has become an inevitable requirement for development.
At present, domestic and foreign patents and technologies are difficult to meet the needs of mid-to-high-end wood-plastic furniture materials for appearance, strength, flame retardancy and cost. Therefore, it is particularly important to develop a low-cost, high-strength flame-retardant wood-plastic composite material, which has good market prospects and social benefits, and increases the added value of the application of wood-plastic composite materials.
The new high-efficiency flame-retardant and smoke-suppressing PVC-based wood-plastic composite material is made of the following components by mass:100 parts of SG‑8 type PVC resin, 40 parts of rubber wood powder, 3 parts of acrylic-butadiene-styrene copolymer impact modifier, 0.2 parts of aluminate coupling agent, 0.5 parts of stearic acid lubricant , 5 parts of zinc stearate heat stabilizer, 2 parts of chlorinated polyethylene, and 5 parts of zinc borate smoke suppressant; the preparation method is carried out according to the following steps:
(1) Weigh the above raw materials in parts by mass;
(2) Put the above raw materials into a high-speed mixer and perform high-speed premixing for 6 minutes at a speed of 1400 rpm to obtain a dry mix;
(3) Put the dry mixture into a torque rheometer and mix at 175°C for 8 minutes to obtain a mixture;
(4) The mixed material is hot-pressed using a flat vulcanizer, and then cut with a universal cutting machine. Compared with existing technologies, the material produced has the advantages of low cost, low smoke, low toxicity, high mechanical properties, and high flame retardancy.
At present, flame retardants and flame retardant treatment processes suitable for wood-plastic composite materials have attracted widespread attention from many scientific researchers and enterprises, and some research results have been achieved. However, some research is still in the experimental stage and has not yet been industrialized. However, New high-efficiency PVC wood plastic materials will develop rapidly.