Glass fiber reinforced plastic is a composite material with various varieties, different properties and wide application. It is a functional new material made from a composite process of synthetic resin and glass fiber.
Features of glass fiber reinforced plastic:
(1) Good corrosion resistance: FRP is a good corrosion-resistant material. It has good resistance to the atmosphere; water and general concentration of acid and alkali; salt and various oils and solvents. It has been widely used in chemical anti-corrosion. Every aspect of it. Is replacing carbon steel; stainless steel; wood; non-ferrous metals and other materials.
(2) Light weight and high strength: The relative density of FRP is between 1.5 and 2.0, only 1/4~1/5 of carbon steel, but the tensile strength is close to or even exceeds that of carbon steel, and the strength can be compared with high-grade alloy steel. It is widely used in aerospace; high pressure vessels and other products that need to reduce their own weight.
(3) Good electrical properties: FRP is an excellent insulating material for the manufacture of insulators, which can still be maintained at high frequencies.
(4) Good thermal performance: FRP conductivity is low, and it is 1.25~1.67KJ at room temperature. Only 1/100~1/1000 of metal is an excellent thermal insulation material. It is an ideal thermal protection and ablation resistant material in the case of ultra-high heat in an instant.
(5) Excellent process performance: the molding process can be selected according to the shape of the product and the process can be molded at one time.
(6) Good designability: The material can be fully selected according to the requirements to meet the performance and structure requirements of the product.
(7) Low modulus of elasticity: The modulus of elasticity of FRP is twice as large as that of wood but 10 times smaller than that of steel. Therefore, in the product structure, rigidity is often insufficient and deformation is easy. The solution can be made into a thin shell structure; the sandwich structure can also be compensated by high modulus fibers or ribs.
(8) Poor long-term temperature resistance: Generally, FRP cannot be used for a long time at high temperature, and the FRP of general-purpose polyester resin will decrease significantly at 50 degrees or more.
(9) Aging phenomenon: It is easy to cause performance degradation under the action of ultraviolet light, sand, rain, snow, chemical medium and mechanical stress.
(10) Low interlaminar shear strength: Interlaminar shear strength is borne by resin and is therefore low. The adhesion between the layers can be improved by selecting a process, using a coupling agent, etc., and avoiding shearing between layers during product design.
Glass fiber reinforced plastic advantages:
The heat-resistant temperature of glass fiber reinforced plastic is much higher than that without glass fiber, especially nylon plastic.
Glass fiber reinforced plastics have low shrinkage and high rigidity.
Glass fiber reinforced plastics do not stress crack, and the impact resistance of glass reinforced plastics is much improved.
Glass fiber reinforced plastics have high strength, such as tensile strength, compressive strength and bending strength.
Glass fiber reinforced plastics, due to the addition of other additives, make the glass fiber reinforced plastics have a much lower combustion performance, and most of the materials cannot be ignited, which is a flame retardant material.
Disadvantages of glass fiber reinforced plastic:
Glass fiber reinforced plastics are made opaque due to the addition of glass fiber, and are transparent before adding glass fiber.
Plastic glass fiber reinforced plastics have lower toughness and more brittleness than plastics without glass fiber added;
Plastic glass fiber reinforced plastics Due to the addition of glass fiber, the melt viscosity of all materials increases, the fluidity deteriorates, and the injection pressure is much higher than that without glass fiber. For normal injection molding, the injection temperature of all reinforced plastics is higher than that of the plastic. The glass fiber was previously increased by 10 ° C to 30 ° C.
Due to the addition of glass fiber and auxiliaries, the hygroscopic property of glass fiber reinforced plastics is greatly enhanced. The original pure plastics will not absorb water, so they must be dried during injection molding.
Glass fiber reinforced plastic In the injection molding process, the glass fiber can enter the surface of the plastic product, making the surface of the product rough and spotted. In order to achieve a higher surface quality, it is preferable to use a mold temperature machine to heat the mold during injection molding, so that the plastic polymer enters the surface of the product, but the appearance quality of the pure plastic cannot be achieved.
After the glass fiber is reinforced, the glass fiber is a material with high hardness. The high-volatility of the auxiliary agent is a highly corrosive gas, which is very wear and corrosion to the screw and the injection mold of the injection molding machine. Therefore, the production of such materials is used. When working with molds and injection molding machines, pay attention to the surface anti-corrosion treatment and surface hardness treatment of the equipment.
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Commercial lighting is a term used to describe lighting that is used in commercial spaces, including auto dealerships, distribution centers, churches, factories, offices, and warehouses. Unlike residential lighting, commercial lighting is made to withstand more abuse and has a longer lifespan.
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