Chlorinated polyvinyl chloride double-wall corrugated pipe formulation and its production process

Abstract

Disclosed are dispensation of perchlorinated polyvinyl chloride wave-shaped pipe and its productive technique, especially that for high volume cable and its productive technique. The dispensation (mass ratio) is: perchlorinated polyvinyl chloride resin(50-80), polyvinyl chloride resin (20-50), compound lead salt stabalizer (4.5-7.5), stearic acid (0.6-0.8), polyethylene(0.3), paraffin(0.3), calcium carbonate (4-10) and anti-impact ACR (6-8). Its productive technique is: mix the mixture for 10-13min, till the temperature reaches 120-135deg.c, cool it to be 45-55deg.c and feed the material, finally press and plasticize to form the product in 170-185deg.c. The invention produces the wave-shaped pipe whose hot deformative temperature is not lower than 93deg.c, with sentific dispensation and reasonable productive technique, which can solve the protective jacket problem existing in high volume cable underground.

Description

technical field [0001] The present invention relates to a double-wall corrugated pipe used for conveying solid and liquid materials or for sheathing various underground pre-embedded lines, especially a kind of pre-embedded underground line for sheathing prone to heat, such as sheathing underground high-voltage Formula and production process of heat-resistant double-wall corrugated pipe for power cables. Background technique [0002] Existing rigid polyvinyl chloride double-wall corrugated pipes for conveying solid and liquid materials or for sheathing underground embedded wires are widely used because of their light texture, high rigidity and strength, and moisture-proof and corrosion-resistant characteristics. It is used to sheath the underground pre-embedded wires at various normal temperatures to bear the weight of the soil layer above the pre-embedded wires, pedestrians, vehicles, etc., as well as the impact from the ground, but it is poor in heat resistance and thermall...

AI Technical Summary

Problems solved by technology

A chlorinated polyvinyl chloride resin (i.e. CPVC resin) with good heat resistance and a molecular structure similar to hard polyvinyl chloride resin (i.e. PVC resin) has attracted people's attention, but when using CPVC resin as a material for trial production, Due to the following problems, it is difficult to make double-wall corrugated pipes. The reasons are: 1) CPVC resin is easy to absorb moisture and has very poor processing performance. During processing, the processing temperature needs to be increased due to the high melt viscosity and poor fluidity, but due to The processing temperature is very close to the decomposition temperature of the material, which is easy to cause the material to decompose, and the gas generated by the decomposition will catalyze the decomposition of the material, triggering a chain reaction of further decomposition of the chlorinated polyvinyl chloride resin raw material; 2) Pre-processing of the material The plasticity is poor, so it is easy to coke the material in the narrow and long flow channel of the double-wall bellows mold

The result will be the suspension of the production process

Images