The following is glass fiber, it is formed by glass ball or waste glass as raw materials after high temperature melting and drawing.
Glass fiber, although the intensity is high, but the fibers is loose, can only sustain tension, unable to bear bending, shear and compressive stress. If they are bonded together with synthetic resin, can be made into various fixed shaped hard products that withstand tensile stresses and withstand bending, compression and shear stresses.
Because its strength is equivalent to steel, it also contains glass components, with the color, shape, corrosion resistance, electrical insulation, heat insulation and other properties of glass, it has formed an easy-to-understand name "FRP", also known as GFRP, ie fiber reinforced plastic.
We can see FRP in many places, such as the chair of the Chinese school cafeteria:
Amusement park cartoon characters :
Anti-collision railings on high speed:
FRP is used in a wide range of places, such as many urban sculptures, arts and crafts, fast dining tables and chairs, motorcycle parts, fiberglass flower pots, hard hats, advanced amusement equipment, household appliances, etc.
FRP is also widely used in vehicles such as small motor boats, lifeboats, yachts, and automobile manufacturing.
It is used as a fuel tank and pipe on jet aircraft to reduce the weight of the aircraft. The astronauts who boarded the moon, the miniature oxygen cylinders carried on them, were also made of fiberglass.
FRP is easy to process, stainless steel is not bad, no need for paint. Sino FRP products still use the oldest composite material molding method - hand lay-up.
The process of the hand lay-up process is: firstly apply a release agent on the surface of the mold which has been cleaned or surface-treated, and after sufficient drying, a curing agent (initiator), an accelerator, a pigment paste and the like are added. Stir the gel coat or resin mixture evenly, apply it on the molding surface of the mold, and then lay a reinforcing material such as cut glass cloth (felt) on it, and pay attention to soaking the resin and removing air bubbles. The above layering operation is repeated until the design thickness is reached, and then the curing is released.
Others include pultruded and molded:
Thermosetting molding is a method in which a certain amount of molding material is added to a preheated mold to form a plastic product by heat and pressure curing. The basic process is: putting a certain amount of the mold material which has been pretreated in a preheated mold, and applying a higher pressure to fill the mold cavity with the mold material. The molding material is gradually solidified under a certain pressure and temperature, and then the product is taken out from the mold, and then necessary auxiliary processing is performed to obtain the product.
The pultrusion process is continuous drawing of the traction device, so that the reinforcing material such as the roving glass fiber roving and the felt material on the creel is impregnated by the glue liquid, passes through the heating mold with a fixed cross-sectional shape, and is solidified in the mold, and An automated production process that achieves continuous extrusion.
