3. Application of pultruded FRP products
In addition to the corrosion resistance, aging resistance, and insulation properties of traditional FRP materials, pultruded FRP products also have the characteristics of stable product size, good appearance quality, and high production efficiency. Because of these excellent properties and characteristics, it has been applied in more and more fields, and has a very broad market at home and abroad.
The application examples of pultruded FRP are as follows:
Electrical: cable brackets, ladder frames, brackets, insulation ladders, insulation rods for transformers, etc., motor slot wedges, lighting accessories, lampposts, antenna masts, suspenders for live maintenance overhead lines, power radio towers, fiber optic cable cores material etc.
Construction civil and building materials: greenhouses, fences, window frames, greenhouse frames, roof decoration materials, bridge components, gas station sunshade and rainproof ceilings, stair handrails, tunnel ventilation windows, house partition wall panels, sidewalk bridges, concrete formwork , scaffolding, sound insulation wall, avalanche prevention shed, etc.
Land transportation vehicles: refrigerated truck components, truck structural parts, bus side wall panels, trailer floors, bus exhaust pipes, luggage racks, direction signs, seats, etc.
Corrosion-resistant equipment: chemical equipment, water treatment equipment, brewing equipment, sewage treatment plant cover plate, corrosion-resistant storage tank protection frame, scrubber assembly components, aquarium inspection corridor, cooling tower bracket, sucker rod, offshore oil production equipment tires, etc.
Sports and entertainment: bows and arrows, fishing rods, tent poles, operating rods for sailboats, surfboard components, sailboat tension components, snowboards, combined swimming pool side panels, snow boats, balance sticks, golf clubs, etc.
Marine-related products: tanks and pipes for ships (including fuel tanks for minesweepers, coastal lampposts, marine keels, railings, handrails, stairs), floating docks, grilles for ships, etc.
Aircraft interior decoration materials: structural materials, shelves, etc.
Agricultural supplies: livestock pens, fencing fences for poultry houses, greenhouse frames for planting, support members, frost-proof net pillars, rattan fences, water tanks for irrigation, etc.
Others: flag poles, bed components, tool handles, etc.
It can be seen from the above that pultruded FRP products have a wide range of applications, and have a large proportion of applications in the fields of electrical, land transportation, corrosion resistance, construction, civil engineering and building materials. The relevant parts are further elaborated below.
3.1 Electrical related fields
No matter now or in the past, electrical related products have always been one of the important application fields of pultruded FRP. For materials such as steel cable brackets for the Channel Tunnel between France and France, aluminum hydroxide filler is used as the bracket material to modify acrylic resin, which has achieved high flame retardancy and low smoke emission. The pultrusion material is used to make the mobile phone line bracket. Since it is 80% lighter than the steel bracket, it does not need special reinforcement when installed on the roof and tower top, and the project can be used safely.
3.2 Construction, civil engineering and building materials
Due to the further improvement of the mechanical properties and durability of pultruded FRP and the combined connection technology, the credibility has been enhanced, and now it has entered the structural materials from the interior and exterior decoration materials and civil materials that were applicable in the past. For example, large-scale pultruded I-shaped FRP products are used to make beams for the construction of 19-meter-high stair towers, which can withstand strong winds and are designed for wind loads of more than 650kg/cm2. The trial of pultruded FRP used as a bridge structure material is expanding, and the sidewalk bridge has been put into practical use. There are also examples of building road bridges. Such as bridge span 6m, bridge width 3m, 11 tons of trucks can pass. Japan adopts pultruded FRP to make concrete formwork to replace part of plywood, which is of great significance to save natural wood. This kind of FRP formwork is 1/3 lighter than steel formwork, and it is labor-saving and convenient to carry, install and disassemble; it has good peelability from concrete, beautiful processing surface and no rust, corrosion resistance, suitable for construction in coastal areas and other places, and can be used with other Material insert molding. Acoustic clapboard for expressway is a new field of pultrusion FRP products. Due to the good strength, good weather resistance and good radio wave permeability of this kind of sound insulation board, it can compete with PVC sound insulation board. Japan developed the avalanche prevention grid to replace the previous steel plate, which solves the shortcomings of the steel plate, such as easy to rust, difficult to move, difficult to construct, and high maintenance costs, and the weight can be reduced by 1/2.
The reason why pultruded FRP products can be used in the construction industry is because this material itself has good comprehensive properties such as high strength, light weight, corrosion resistance, low water absorption, flame retardancy, heat preservation, sound insulation, and long-term light without deformation. It is suitable for wood, steel, plastic, aluminum alloy and other materials, so FRP doors and windows will become the ideal new building doors and windows in my country, with huge market potential at home and abroad.
3.3 Corrosion resistance field
The field of corrosion resistance has always been an important application field of the entire FRP profile. The characteristics of pultruded FRP can be used as structural materials, such as the central beam and chassis of cooling towers, and the large-scale hollow pultruded FRP profiles with a cross-section of 120×25cm have a bright future. In addition, pultruded FRP can be used to make the cover plate of the sewage treatment plant, which has more and more uses, and is more suitable than hand-laid FRP and RTM FRP materials. Pultruded FRP profiles can be used as tires for offshore oil production equipment, replacing steel, to achieve the characteristics of light weight, corrosion resistance, no welding, and reduced maintenance costs.
3.4 Other fields
The prospect of pultruded fiberglass pillars, stalks, rods and other materials for agriculture and fishery is promising. Japan adopts pultruded FRP water gates with glass fiber and carbon fiber as reinforcement materials to replace steel gates. The weight is reduced from 300kg to 70kg, which is easy to open. Does not rust. Japan has also developed a pultruded FRP irrigation water tank with glass fiber and carbon fiber as reinforcement materials, replacing reinforced concrete or steel water tanks. The water tank is 1.7m wide and 800mm deep, and each section is 12m long. It is made of 60mm square profiles. It is not only resistant to acidic soil corrosion, but also can reduce the cost of the project, killing two birds with one stone.
4. Market development prospect of pultrusion FRP technology
It has become a consensus that pultruded FRP has high production efficiency, excellent product performance and stable quality. As long as there is a breakthrough in pultrusion technology and high-quality FRP pultrusion products can be produced, the market can quickly accept it.
The development of the domestic FRP raw material industry has created a good material foundation for FRP pultrusion technology and market development. At present, except for a few reinforcing materials, the main raw materials required for pultrusion production can be provided domestically.
At present, my country's large-scale pultrusion enterprises have learned from foreign successful experience, and after in-depth research on the pultrusion molding process, they have developed hydraulic and belt-covered pultrusion production lines with their own characteristics and stable performance, and basically realized the pultrusion process. The localization of raw materials has developed general products such as grilles, guardrails, trench covers, electrician ladders, sucker rods, doors and windows; at the same time, it has also used its own technical advantages to develop a mobile communication base station A series of high-tech and difficult pultruded FRP profiles have become suppliers of internationally renowned companies. They have grown into a high-tech enterprise specializing in the research and development of FRP pultrusion technology, as well as the design, manufacture and sales of FRP pultrusion equipment and molds. Technological innovation and product update bring vitality to enterprises and continuously form new sources of profit. This is the mainstream of my country's FRP pultrusion technology and market development.
In short, the overall situation of my country's FRP pultrusion technology and market development is good. Looking forward to the future, the future is bright, let us work together to build the future of China's pultruded FRP industry