Home > Knowledge > Content

Production process of glass steel septic tank

Jun 06, 2020

Glass fiber reinforced plastic septic tanks are mainly used in industrial enterprises for production and urban residents' lives, residential area construction wastewater purification treatment equipment. It is a high-efficiency, energy-saving, light-weight and affordable domestic sewage treatment equipment.It has successfully replaced traditional brickwork and reinforced concrete septic tanks.The price of glass fiber reinforced plastic septic tanks is economical, using the gravity of water, without any external force and operating costs. It saves energy and is easy to manage. It has good social, environmental and economic benefits. What is the production process of glass fiber reinforced plastic septic tank?

FRP septic tank is a treatment equipment that uses sedimentation excreta and biological anaerobic fermentation technology to remove the floating organic matter in domestic sewage. The shape of the glass fiber reinforced plastic septic tank is generally a horizontal cylindrical shape, and the heads at both ends are generally designed with wheel-shaped concave and convex surfaces with good mechanical properties.The glass fiber reinforced plastic septic tank has a partition inside, and the holes on the partition are misaligned up and down. It is not easy to form a short stream, which greatly improves the reflection efficiency. The main raw materials of glass fiber reinforced plastic septic tank are organic resin, glass fiber, talc powder filler,

Its production process is as follows: the glass fiber reinforced plastic product cylinder structure is divided into four layers: anti-corrosion layer, anti-seepage layer, strength layer and outer surface layer:

1. Anti-corrosion layer

The base of the anticorrosive layer should be bisphenol A unsaturated polyester resin, vinyl ester resin and other resins with excellent corrosion resistance, and the reinforcing material is glass fiber roving.

2. Impervious layer

The purpose of adding suitable star filler in the resin of the lining is to enhance the stability of the lining, because the addition of the filler can reduce the flow rate of water, thereby reducing the permeability, and can reduce the coefficient of thermal expansion, thereby improving the thermal stability of the lining.

3. Strength layer

The strength layer is composed of two parts: the plane thickness and the reinforcing ribs. The plane thickness is made of special resin as the matrix, glass fiber untwisted roving cloth is the reinforcing material, and the resin content is 45%~50%. The thickness of this layer is determined by the product diameter design calculation. Reinforcement ribs are placed inside the barrel from the aspect of aesthetics and strength. The reinforcement ring is made of FRIM and direct FRP materials. Both materials must be closely bonded to the barrel and the tank to maximize the effect.

4. The outer layer

The special resin matrix with excellent weather resistance, glass fiber surface felt or glass fiber roving cloth (thickness less than 0.16mm) is used as the reinforcing material, the resin content is more than 55%, the thickness of the layer is 0.2 ~ 0.5mm.

Technical requirements for the processing technology of glass fiber reinforced plastic septic tank:

1. Rubber compound configuration

Containers equipped with glass fiber reinforced plastics should be kept clean, dry and free of oil stains. When configuring the rubber compound, the material should be accurately weighed. Each time the configuration star is determined according to the needs of the site, it is ready to use. Weigh a certain star of resin in the container. When the temperature is low and the viscosity is large, indirect heating can be adopted, but it must not exceed 40°C, and then the diluent is added to stir evenly. After the temperature drops to normal temperature, add the curing agent and fully Stir, and finally mix in powder, and then mix evenly. The prepared compound is generally used within 30 minutes from the time of adding the curing agent.

2. Barrel processing

(1) Thinly and evenly coat the prepared primer on the surface of the treated base layer, and naturally cure for not less than 12h. Fill the surface of the concave and uneven areas with putty to scrape or polish it.

(2) Before interlining, cutting and trimming should be done according to the shape and size of the structure. The flat surface can be formed by the whole glass cloth--continuous molding. Complex parts such as heads, water tanks, wellheads, manhole covers, special rings, etc. should be set out and numbered first, and then cut. The cut glass cloth should not be folded, and should be tiled or formed. Volume storage. The order of the lining of the glass cloth can be determined according to the structure and shape of the equipment. Generally, it is first raised to the bottom, then to the bottom, first to the bottom, then to the wall, then to the bottom, then inside and then outside. When interlining, first coat a layer of glue on the base layer, and then stick a layer of glass cloth on the glass with a rubber roller dipped in the glue, so that the glass cloth is saturated with the glue and adheres to the substrate, and then use the bubble The stick drove out the bubbles between the layers.

The interlining cloth generally adopts the fish scale overlapping method, that is, after the first cloth is laid, the second cloth is laid on the first cloth with a half width, and the other half is laid on the base layer. Such continuous lining forms two layers of cloth lining. When pasting the third, fourth, and fifth layers, the overlap width of each cloth with the previous cloth is 9/10, 4/5, 7/10. The number of layers to be laid one time depends on the number of layers specified in the product diameter design. If there are defects such as burrs, air bubbles and glue sag, they should be polished and removed for repair. The overlap width of the glass cloth such as the head, water distribution box, wellhead, manhole cover and special ring shall not be less than 50mm. The overlapping seams of the upper and lower layers shall not overlap each other, and the distance between the seams shall not be less than 50mm. For the manholes, add 3~5 layers of glass cloth. The glass cloth should be cut tightly at the corners of the wellhead and manhole cover.

(3) Reinforcement installation

Reinforcement ribs should be made according to the actual lofting. Use an angle grinder (cloth grinding wheel) to roughen the pavement, put the reinforcing ribs at the specified position and press it, fix it with putty, and put putty into a rounded shape at the corner.

(4) The barrel is connected to the head

Because the glued layer has the advantages of good sealing, smooth and beautiful production surface, high mechanical connection strength and reliability, and large anti-stripping ability, it has adopted a compound connection form of glued and mechanical.