Para-aramid fiber is a new type of high-tech synthetic fiber, which has excellent properties such as ultra-high strength, high modulus, high temperature resistance, acid and alkali resistance, and light weight. Or 2 to 3 times that of glass fiber, the toughness is twice that of steel wire, and the weight is only about 1/5 of steel wire. At a temperature of 560 ° C, it will not decompose or melt. Aramid fiber cloth composite material has high tensile strength, small specific gravity, good corrosion resistance, good elongation, good insulation performance, strong toughness, high shear strength and extrusion strength, strong shock resistance, and excellent intrinsic flame retardancy. Performance, can be used to repair and reinforce bridges, columns, subways, chimneys, water towers, tunnels, electrified railways, seaports and wharves, especially suitable for reinforcement and repair of concrete structures.
Aramid unidirectional fabric products can be used in composite applications with concrete structures, and the scope is relatively wide. For example, it is applied to beams, mainly bridges and civil buildings or industrial plants. The reinforcement methods include bending resistance and shear resistance. When performing bending resistance, the fiber direction of the aramid cloth is consistent with the axial direction of the beam. The tension side to increase the load-carrying capacity of the beam. According to relevant tests, as long as the beam is not a super-reinforced beam, a layer of 280 grams of aramid cloth can increase the bearing capacity by about 30%, and two layers can increase the bearing capacity by about 40%. The direction is perpendicular to the axis of the beam.
Aramid cloth is also ideal for reinforcing posts. First of all, because the elastic modulus of aramid fiber is 118Gpa, compared with the elastic modulus of carbon fiber 230Gpa, aramid fiber has better ductility; secondly, only about 10mm is needed for edge grinding, and generally no grinding is required, while carbon fiber needs about 30mm. In contrast, using aramid cloth can save a lot of man-hours. Finally, since aramid cloth is a kind of soft cloth, it has better followability, especially for caps with irregular shapes, it is more suitable to use aramid cloth for reinforcement.
In terms of reinforcement applications of masonry and panels, the requirements for the reinforcement headroom of the panels are generally relatively high, and the appearance will not be affected after reinforcement, so it is more convenient to use thin and soft aramid composite materials for reinforcement. In the reinforcement of chimneys and water towers, due to the high-altitude development of structures such as chimneys and water towers, it is difficult to reinforce and maintain them. Traditional methods are basically difficult to solve such problems, and aramid fibers are light, high-strength, corrosion-resistant and durable. Good, it will be a better choice for strengthening chimneys and water towers.
In the reinforcement of subway tunnels, aramid fabrics also have certain advantages. Since subways and tunnels are structures that work underground, their force is different from that of the ground structure, and there are earth pressures on the roof and sides of the cave. It also has the requirement of headroom, so when repairing cracks, the possibility of using traditional reinforcement methods is very small. Reinforcement and maintenance with aramid cloth can meet its various requirements. The cracks in the vault or side wall of the subway or tunnel are generally multi-directional and irregular, which requires its repair materials to have good shear resistance, and aramid is also a non-conductive FRP material. Therefore, The advantages of aramid cloth in the reinforcement application of tunnel subway engineering are quite prominent.
From the perspective of materials, the technical difficulties mainly focus on the performance of raw silk and weaving level. Taihe New Materials strictly controls the quality of raw silk and weaving fabrics. Taipulong aramid unidirectional fabric has been tested and certified by the national authority. All have reached the high-strength Class I standard stipulated in the national standard.
With the rising price of carbon fiber in recent years, the cost performance of aramid fiber has reached the market acceptance range. The price of low-grade aramid fiber is in the same range as that of low-grade carbon fiber, and from the analysis of the current market situation, the supply stability of aramid fiber is higher than that of carbon fiber, while the price of high-grade aramid fiber is much lower than that of high-grade carbon fiber price. In the long run, the cost-effective advantage of aramid fiber is still obvious.
However, the market has become accustomed to using carbon fiber for building reinforcement, and has limited awareness of aramid fiber. Faced with this situation, we need to increase the market's recognition of aramid fiber and increase its popularity.
The company's main product, Minshida Aramid Paper, is a special new paper-based material made of pure aramid fiber, which has excellent mechanical strength, high temperature resistance, flame retardancy, chemical corrosion resistance and good electrical insulation. It is an indispensable high-performance material in a wide range of applications such as aerospace, rail transit, new energy vehicles, and electrical insulation. According to the application, our main products can be divided into two categories: electrical insulation paper and honeycomb core paper.
The honeycomb structure material made of aramid paper has excellent characteristics such as light weight, high strength, high modulus, flame retardancy, high temperature resistance, and low dielectric loss, and has become the preferred core material for honeycomb composite materials in the aerospace field.
What are the specific applications of aramid paper honeycomb in urban and rural construction, rail transit, transportation and water conservancy, etc.?
Aramid paper is a high-performance insulating material, which can be used in the insulation system of high-end and complex working conditions. In urban and rural construction, it can be used in the insulation materials of electronics, motors, UHV, power transformers, and distribution transformers; in rail transportation, it can be used in high-speed rail , traction transformers for freight locomotives, traction motors, magnetic levitation linear motor insulation materials, high-speed rail interior parts and weight-reducing materials, etc.; in aerospace, it can be used in commercial aircraft interior parts, secondary load-bearing parts, etc., aramid paper as large The use of aircraft interior and structural parts will reach a very objective amount every year; in terms of transportation and water conservancy, it can be used in large-scale hydraulic generators, traditional automobile inspiration motors, new energy vehicle drive motors, etc.
Aramid paper honeycomb has good performance in noise reduction and heat insulation. In the future, as a new material for green buildings and energy-saving buildings, it can also have more application space in the construction field.