High-end product design of plastic wood materials for outdoor architecture and landscape
Friday, June 2, 2023The comprehensive performance of wood-plastic materials is excellent, and there are more and more varieties and quantities of plastic-wood used in outdoor buildings and landscapes. With the continuous progress of manufacturing technology and process, the appearance quality of products has been greatly improved. However, there are many plastic wood companies, even many big brand companies, due to the lack of targeted research, there are inherent defects in material design. These defects are often exposed gradually after two or three years of construction, and it is too late to solve the problems at this time. Material Design flaws are often difficult to spot when tracking down issues.
Deformation of WPC material
After being used for a period of time for outdoor plastic-wood buildings and landscapes, some long-scale plastic-wood will gradually bend and sag, which is a common defect in outdoor plastic-wood buildings and landscapes. The research and analysis of the deformation factor of the plastic wood material from the beautiful straight shape when it is built to the gradual bending and deformation after several cold and heat is as follows:
Temperature stress and creep
As the temperature rises in summer, plastic wood materials generate thermal expansion. The thermal expansion of the longer plastic wood is larger, because the two ends are fixed, the temperature stress is also large (the stress is proportional to the expansion deformation), when the expansion reaches a certain value, the plastic wood becomes unstable and bends and deforms, and the bending increases with the thermal expansion degree (bending deformation) increases. After the plastic wood is bent, the temperature stress is released; the neutral plane stress is zero, because of bending, the concave surface produces compressive stress, and the convex surface produces tensile stress. Due to the long-term effect of tensile and compressive stress, the convex and concave surfaces produce tensile and compressive creep respectively, which makes the curvature larger, and cannot fully shrink and recover when the temperature drops. In this case, after several temperature cycles, periodic creep superimposition is continuously produced; as the creep increases and the binding force of the polymer chain gradually reaches equilibrium, the creep increment gradually decreases to zero, reaching the creep limit. If the installation is in the high temperature season, the temperature difference with the highest temperature is small, and there is basically no bending deformation due to thermal expansion. However, in the low temperature season, the toughness and strength of plastic wood decrease with temperature; because both ends are fixed, the temperature stress generated by plastic wood shrinkage due to cooling reaches the maximum value, which often leads to damage at the fixed place.
Water swelling creep
During the rainy season, WPC absorbs water and swells, and the WPC material produces a small amount of creep elongation, which cannot be recovered; and with the alternating cycle of dryness and wetness, creep elongation occurs periodically and superimposes. As the wood inside the plastic wood reaches the possible water expansion limit and the binding force of the polymer material, the increment of water expansion creep elongation gradually decreases to zero, reaching the creep limit.
The creep of WPC material is the superposition of temperature stress creep
The comprehensive result of water-absorbing expansion and creep is relatively long. When the two ends of plastic-wood are fixed and restrained, with the superposition of various creeps of plastic-wood materials, the beautiful straight-line material will gradually show obvious bending when it is built; After the alternation, the dimensions are basically stable, and the curvature does not increase any more.
WPC high-end product design for outdoor buildings and landscapes
In terms of design ideas, the wood-plastic profile is upgraded from a homogeneous composite material to a double-layer functional composite material. Through the improvement of technology, technology, equipment and appropriate cost increase, a double-layer distinction solution is proposed, which is beneficial to overcome technical difficulties, and thus obtained High-grade plastic wood profiles with high quality, high appearance, high performance and long life.
In recent years, with the development of technology, high-end plastic-wood co-extruded plastic wood has emerged. It uses the most advanced extrusion molding technology in the industry to evenly and firmly cover the co-extruded layer. Using this new technology to produce co-extruded plastic wood, in addition to retaining the advantages of traditional mold-proof, insect-proof and other physical properties, it also has stronger wear-resistant, scratch-resistant, stain-resistant and weather-resistant properties, and is more beautiful and durable. It is suitable for high-end outdoor garden landscape projects, building templates, villas, courtyard floors and other fields.
The high-end plastic-wood co-extrusion railings have better outdoor performance, and there is no need to consider daily cleaning and maintenance after installation, which increases the long-term beauty and experience. In the harsh outdoor environment, the general wrought iron fence will have the problem of rust and corrosion in a short period of time, and the anti-corrosion wood railing will also have the problem of moth-eaten and rot. If it is not maintained for a long time, the skin will fall off and the interior will break The problem has seriously affected the overall aesthetics of the railing.
The design style of the garden landscape is closely related to the style of the building and the use of materials. Adhere to the functionality of the use. On the premise of a beautiful environment, arrange facilities and places that meet various functional requirements, and provide a beautiful space for rest and communication. High-end co-extruded plastic wood can create a romantic architectural atmosphere according to individual needs regardless of color, pattern and texture. The main principle of improving the durability of plastic wood is related to the type of wood material in the material preparation process, the type of polymer added, and the blending ratio of wood and plastic. For high-end co-extruded WPC, structural durability and aesthetic durability are equally important.
In construction engineering, plastic wood is mainly used in building formwork for pouring concrete. It has many advantages and is an environmentally friendly building formwork material. The rigidity, toughness, density and structural optimization of building formwork prepared from plastic wood can be well solved by continuously improving processing technology and preparation technology, exploring new modification methods and structural design methods. In the form of vigorously promoting the economical use of wood in the country, high-end plastic wood will be more and more used in the field of construction engineering.
The production process of co-extrusion materials with wood grain effect in plastic-wood co-extrusion is a two-step production process. That is to say, the raw materials are blended and modified by adding various modified additives, colorants and functional additives to form a base color material, and then uniformly mixed a certain proportion of various color masterbatches. It must have the following functions: higher co-extrusion adhesion; better processing latitude; more prominent weather resistance; better surface scratch resistance; logs feel better than traditional co-extrusion materials. Wood-grain effect wood-plastic coated co-extrusion material, using acrylic primary rubber powder and acrylonitrile-styrene prepolymer with excellent weather resistance, adding modification additives, high weather resistance colorants and functional additives that can meet customer requirements Blending modification is processed into a base color material, and then a certain proportion of various color masterbatches are evenly mixed. The addition of special color masterbatch makes the product have clear, wood grain effect, realistic wood feeling, wide processability and excellent scratch resistance. For special requirements, such as transparent, wear-resistant, matte, thermal conductivity, electrical conductivity, low surface energy and other products can also be customized to meet the needs of high-end customers.