Glass fiber reinforced plastic is a kind of reinforced plastics made of unsaturated polyester resin. The utility model has the advantages of low cost, good manufacturability and good comprehensive performance after curing, and is widely used in the fields of construction, corrosion prevention, shipbuilding, transportation, automobile industry, electrical industry, etc.. Not only can be used as decorative parts, can also be used as structural materials. Especially in the small batch production, the use of glass fiber reinforced plastic products can reduce costs, shorten production cycle, reduce tooling costs, improve the quality of parts.
The conditions of the workshop: the workshop should be well ventilated and dry, the relative humidity should be less than 80%. The temperature at 15 DEG -25 DEG, and avoid draught. Otherwise, it is easy to cause excessive amount of styrene, so that the resin is not completely cured.
Two, material storage: warehouse temperature should be less than 20 degrees C. Resin storage period shall not exceed its storage period, glass fiber should be placed in a dry place. No more than its storage period. Resin, curing agent should be stored in a cool place away from the workplace. Curing agent and accelerator should be far away. Curing agent can not contact with paper, cotton or other cellulose fabrics, otherwise easy to cause spontaneous combustion.
Three, glass steel production tools: Tools: with plastic barrels, plastic barrels, brush, scissors, gloves, file, roller and some small electric tools.
Four, process equipment (die) choice: according to the appearance of parts requires the selection of die molding or molding mold, plaster for smooth tread. Manufacture the master mould according to the drawing or template. Forming die according to production master mould. The material of the mould and the mould can be metal, wood, gypsum, epoxy resin, filler and glass fiber reinforced plastic.
Five, the choice of resin type: unsaturated polyester resin refers to the linear structure of the soluble, molecular weight is not high while the main chain with duplicate ester bond and unsaturated double bond organic polymer compound. The state of the finished product is a linear unsaturated polyester styrene solution, which can not be stored for a long time, and the cured product is a copolymer of styrene and unsaturated polyester. Due to the different molecular structure, its product performance is not the same. So there are different resin grades, according to the performance can be divided into general type, anti-corrosion, self extinguishing and heat-resistant type, etc.. Commonly used as a general type of 191DA#, 191DC#, etc., its rigidity and rigidity, can be used for glass fiber reinforced plastic products. 196# resin is a flexible resin, which can improve the brittleness of FRP products.
Six, accelerator, curing agent choice: curing agent using benzoyl peroxide two butyl paste, when used to stir evenly. Accelerator with cobalt naphthenate solution of styrene, purple liquid.
Seven, strengthening agent: glass fiber as the main reinforcing agent. Including surface felt, chopped fiber felt, carbon fiber and various fabrics. The content of the reinforcing agent will affect the performance of FRP products. Too little content of reinforcer will affect the rigidity of the product and make the brittleness too large. The content is too much, easy to cause the product to be bad, produces the stratification. Product toughness. The hand paste mainly uses the non twist fabric and the short cut felt and so on.
Surface felt: fixed length of single filament into a Book of a kind of felt, it is fast and can absorb a large number of resin absorption, cover good suitability. Can be used for paving complex surface cover glass steel products, glass fiber reinforced coating resin layer strength, make product surface smooth. 016 glass fiber cloth.
The short cut fiber felt by short fiber length, after the plane is uniformly overlapped with the adhesive fabric, are a felt a. Can absorb a large number of resin, can be used with or without twist fabric.
Plain cloth, twill: these two kinds of cloth in addition to bubble good, easy to penetrate the gel, good shop. Thickness of 0.1mm; 0.2mm; 0.3mm; 0.4mm, etc.. Cover the surface of the product, can increase product appearance.
Carbon fiber: good strength, the price is expensive, such as no special requirements, generally rarely used. According to the appearance requirements and structure, the use of different thickness of the felt and cloth. Generally, the first layer should be made of the surface felt, the second layer with the short cut felt, and then the plain cloth until the thickness of the structure. Special circumstances can be selected depending on the process.
Eight, thixotropic agent (packing): the main gas phase SiO2 (Bai Tanhei), talcum powder, etc.. When the room temperature is high, the fluidity of the glue is large, and it is easy to cause the flow. In order to change this situation, the white carbon black or talcum powder can be added. The amount is determined by the process.
Nine, coating resin and polyester paste: coating resin to change the surface of optical glass and steel products, improve the brightness, corrosion resistance, heat resistance, water resistance and weather resistance, prolong the service life of products, product surface and surface layer made of a layer of resin content, called gel coat. Special resin coating resin is surface layer. The use of curing agent, accelerator and the same amount of other resins. Product coating thickness: the thickness of the gel coat part is 0.25mm-0.4mm, namely 300 grams -400 grams per square meter.
Brushing method: gel coat resin can be divided into two sub populations, second populations should be first after curing. Do not coat resin too thin, otherwise it will not completely cured, and the gel glass fiber will look out. If it is too thick, it is easy to crack and rupture, not impact resistance. If you do not uniform, easy to cause cracks, this is because the surface curing speed, resulting in internal stress. Gel coat resin with pure resin, can be used when necessary