One. Classification characteristics
1. FRP storage tanks: hydrochloric acid storage tanks, chemical storage tanks, anti-corrosion tanks, pressure tanks, fermentation tanks, food tanks, transportation tanks, mixing tanks, etc.;
2. FRP pipes: FRP sand pipes, FRP top pipes, FRP ducts, cable protection pipes, etc.;
3. FRP water tank: magnetic square box, T-slot square box, universal square box, crossed square box, inspection square box, etc.;
4. Environmental protection chemical equipment: desulfurization tower, drying tower, washing tower, sewage treatment equipment, municipal water supply pipeline, etc.
FRP products are good corrosion-resistant materials. First, resins (phenolic plastic, epoxy resin and polyester resin) are used to condense them into one body. The material made has a tensile strength comparable to that of steel-hence the name FRP . You should understand a little bit here, because the product is very hard.
The tensile strength of FRP products is close to or even higher than that of carbon steel, and the specific strength can be compared with high-grade alloy steel. Therefore, it has excellent results in aviation, rockets, space vehicles, high-pressure vessels, and other products that need to reduce their own weight. FRP is a good corrosion-resistant material, and has good resistance to atmosphere, water and general concentrations of acids, alkalis, salts, and various oils and solvents. But its shortcomings are also obvious, that is, its long-term and high-temperature resistance is relatively poor. Generally, FRP cannot be used for a long time at high temperatures. The strength of general-purpose polyester FRP decreases significantly above 50°C. Generally, it is only used below 100°C. General-purpose epoxy FRP has a significant decrease in strength above 60°C.
Three, anti-corrosion characteristics
FRP products have become the transmission medium of many industries with their super corrosion resistance, but how does it realize its unique characteristics? The structure of fiber-wound FRP products is divided into three parts: inner lining layer, structural layer and outer protective layer. Among them, the resin content of the inner lining layer is high, generally above 70%, and the resin content of the resin-rich layer on the inner surface is as high as about 95%. By selecting the resin used in the inner lining, the FRP products can have different corrosion resistance performance when transporting liquids, so as to meet different work needs; for the occasions that require external corrosion protection, only need to carefully select the external protective layer resin. It can achieve different external anticorrosion purposes.
According to different corrosive environments, FRP products can choose different anti-corrosion resins, mainly including: isophthalic unsaturated polyester resin, vinyl resin, bisphenol A resin, epoxy resin and furan resin, etc., according to the specific conditions: For acidic environments, use bisphenol A resin, furan resin, etc.; for alkaline environments, use vinyl resin, epoxy resin or furan resin, etc.; for solvent-based environments, use furan and other resins; as acid, salt, solvent, etc. When the corrosion is not very serious, the cheaper isophthalic resin can be used. By choosing different resins for the inner lining, FRP products can be widely used in working environments such as acids, alkalis, salts, and solvents, and exhibit good corrosion resistance.
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