2.4PS pipe

日期:2020/1/20 9:41:10 / 阅读: / 来源:本站

2.4PS pipe
2.4.1 Rubber-plastic low-pressure water pipe
The use of low-pressure water pipes in China's agriculture and construction industry is very common. Fruit tree plantations in the north and northwest
Here, in large-scale vegetable plantations in the south, water pipes are seen and the amount is very large. On urban construction sites,
Can be seen everywhere.
The common low-pressure water pipes on the market in China are as follows.
① Canvas water pipe produced by webbing process;
② Hard plastic water pipe produced by weaving with thermosetting plastic or paste resin dipping process;
③ Use polyvinyl chloride to extrude the inner tube, wind the fiber reinforced layer, and compound extrude the outer fiber reinforced water delivery pipe;
④ Use polyethylene to directly extrude single-layer transparent or translucent all-plastic water pipes.
The low-pressure water pipes of the above several materials have some deficiencies in use, such as the high price of ribbon canvas water pipes;
Pipes made of thermosetting plastic are sold at low prices, but waste pipes cannot be recycled, causing environmental pollution; PVC / winding fiber reinforced plastic
Extruded water pipes, although waste products can be directly recycled, but the qualified rate of the finished product is low, and it is easy to be affected by the bonding strength between the inner and outer layers in use.
Low and "separated", low service life; single-layer water delivery pipe made of polyethylene directly extruded, the pipe body is thin and easily broken, which is a one-time use
Water pipe. In addition, these low-pressure water pipes have a tendency to be hard, brittle, and low in elasticity under low temperature working conditions.
point. This example introduces a new type of low-pressure water pipe, which has low cost, good weather resistance, waste products can be directly recycled, light pipe body, no
Environmental pollution, high peel strength, can be used repeatedly.
1. Material selection and formula design
Formulated from main raw materials, modified materials, fillers, antioxidants, lubricants, colorants, light stabilizers, reinforcing materials
(1) Selection of main raw materials. SBS is a polystyrene (S)-polybutadiene (B)-polystyrene (S) block copolymer
At room temperature, it has the high elasticity of rubber and the plasticity of thermoplastics. It can be processed by thermoplastics processing methods.
Forming processing, which has the basic characteristics of rubber and plastic, is commonly called thermoplastic elastomer. The performance characteristics of SBS are: ① None
Must be vulcanized and cross-linked, easy to process, short processing cycle, low energy consumption, high efficiency, waste products and scraps can be processed repeatedly.
Recycling; ② Good physical and mechanical properties, high strength, good elasticity at low temperature, and friction resistance; ③ Small density, light weight, easy coloring,
Comfortable texture; ④ Good compatibility, can be blended with a variety of rubber and plastic materials, can improve the cold resistance, tensile properties of the product, resistance to shock
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