Low-friction modified polypropylene/glass fiber reinforced plastic composite electrical tube and manufacturing method thereof

Abstract

The invention discloses a low-friction modified polypropylene / glass fiber reinforced plastic composite electrical tube. A manufacturing method of the low-friction modified polypropylene / glass fiber reinforced plastic composite electrical tube comprises the following steps of performing melt extrusion and granulation on silicones of which the weight-average molecular weight is 800,000 to 1200,000 and modified polypropylene to obtain modified master batch; mixing the modified master batch and the modified polypropylene under the condition that the silicones in an inner layer of the electrical tube are 2-5wt%; drying the mixture and the modified polypropylene and performing melt compound extrusion on the mixture and the modified polypropylene to obtain a double-layered tube; and compounding a composite glass fiber reinforcement layer on the outer wall of the double-layered tube so as to obtain the composite electrical tube which sequentially comprises a modified polypropylene low-friction layer 1 containing the silicones, a modified polypropylene layer 2 and a glass fiber reinforcement layer 3 from inside to outside. The frictional coefficient of the inner layer of the composite electrical tube is 0.08-0.23. The composite electrical tube has advantages of a glass fiber reinforcement plastic cable conduit and a modified polypropylene plastic cable conduit; by the silicones in the inner layer of the composite electrical tube, the surface friction coefficient of the inner wall of the composite electrical tube is greatly reduced; and the composite electrical tube is a product with excellent overall performance in the field of plastic composite conduits for power cables.

Description

technical field [0001] The invention belongs to the technical field of composite conduit for electric cables and its preparation, and in particular relates to a low-friction modified polypropylene / glass reinforced plastic composite electric conduit for electric cables and a preparation method thereof. Background technique [0002] In the current urban construction process, more and more power cables are used in the distribution network. In order to protect the outdoor underground power cable lines from the mechanical damage, chemical action and rotten plants caused by the laying environment, in order to reduce cable faults And to prolong the service life, it is necessary to lay the cables in the cable row (guide) tubes, that is, to insert the power cables in the pre-laid power tubes. According to DL / T802 "Technical Conditions for Conduits for Power Cables", the existing power pipes (also known as conduits) for power cables can be divided into: glass fiber reinforced plastic ...

AI Technical Summary

Problems solved by technology

However, during the construction process, due to the large frictional resistance of the inner pipe wall, the inner surface of the pipe cannot withstand the friction of the traction steel cable or the outer sheath layer of the cable, and the glass fiber will hang out from the inner wall, forming a continuous winding on the cable. Fibrous filaments will eventually cause the cable to be stuck, making it impossible to carry out cable construction

[0004] The modified polypropylene plastic cable conduit has good corrosion resistance, good pipe rigidity and toughness, excellent heat resistance, light weight, and low material cost, but due to its large linear expansion coefficient of polypropylene (0.06-0.1mm / m.K), when the joints are socket-type connections, if the installed pipeline system is long and in an environment with large temperature differences, the pipelines are easily deformed, resulting in cracks at the joints, which cannot protect the power cables. The use of hot-melt connection will not only cause the problem of increased construction difficulty, but also at the hot-melt connection, due to the internal and external overflow of materials, on the one hand, the internal cross-sectional area will be reduced, the internal resistance will increase, and the The difficulty of threading the cable, on the other hand, will cause the inner wall to be uneven, scratch the outer sheath of the power cable, and cause the circuit to leak or short circuit

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