Jan. 04, 2019
As a green environmental protection material, the development and application of wood plastic composite materials has become a research hotspot in recent years, and PVC wood plastic composite materials, especially co-extruded products, completely overcome the shortcomings of logs, make up for the shortage of logs, and retain logs. Unique wood feel. In particular, it has waterproof and fireproof functions, and can also be used for decoration in indoor high temperature areas such as kitchens and bathrooms. At the same time, pvc plastic wood composite materials can produce imitation wood products of different grades, different specifications and different colors according to different wood species and colors. The domestic and international pvc plastic wood composite materials develop faster in the field of architectural decoration.
Although PVC wood plastic composites have many advantages, they are used as structural materials such as outdoor façades and stencils, which have the disadvantages of being easily deformed by heat and having low mechanical strength, which limits the application range to a certain extent. Therefore, the further preparation of PVC-based wood plastic composites with high strength, high modulus and high heat-resistant deformation temperature has become a research hotspot and a difficult point. The industry has conducted many researches and practices on this difficulty.
For example, chlorinated polyvinyl chloride (CPVC) is a product of further chlorination of PVC, which has better heat resistance and mechanical properties than PVC, and can be used as a blending modifier for PVC. The appropriate amount of inorganic mineral fillers, such as calcium carbonate, attapulgite, muscovite, etc., can further improve the strength, modulus and heat resistance of the composite. Some studies have proved that PVC plastic wood composites are modified with CPVC resin to obtain the optimized ratio of PVC/CPVC. On the basis of this, two kinds of inorganic rigid particles, muscovite and attapulgite, were used to modify PVC/CPVC wood-based composite materials. Based on the test results of heat resistance and mechanical properties, combined with on-the-shelf morphology analysis, two kinds of particles were applied to PVC/CPVC. The modification effect of the wood-plastic composite material is good.
First, CPVC significantly improved the heat deformation resistance and mechanical properties of PVC plastic wood composites. When the ratio of PVC/CPVC is 50/50, the heat distortion temperature reaches 80oC or more, and the tensile strength and bending strength of the composite material are remarkably improved.
Second, after adding inorganic rigid particles, the heat resistance and mechanical properties of the PVC/CPVC wood-based composite material are further improved. When the amount of muscovite and attapulgite is 3 parts, the heat distortion temperature is increased by 14.3 °C and 19.7 °C, respectively. At the same time, the mechanical properties of the composite are better. Compared with muscovite, attapulgite has a more significant effect on the heat resistance and mechanical properties of the composite. Co-extruded PVC plastic wood products are a major feature of the Chinese market, enriching and expanding the wood-plastic composite materials and their application fields, and the market potential and scale are much larger than polyolefin plastic wood products. Foamed and co-extruded PVC plastic wood products (flame retardant, lightweight, high-strength, beautiful) deserve attention, indoor green home improvement PVC plastic wood products suddenly emerged, leading the trend; open indoor and outdoor plastic wood product line and realize wood plastic integrated housing Provide technical and product support.
