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Method for making double-axial hard polyvinyl chloride tubular material

A rigid polyvinyl chloride, biaxially oriented technology is applied in the field of manufacturing biaxially oriented rigid polyvinyl chloride pipes to achieve the effects of accurate size, good quality and high drawing efficiency

Inactive Publication Date: 2003-08-27
SICHUAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of this invention is to provide a kind of manufacturing method of biaxially oriented rigid polyvinyl chloride pipe in view of the deficiencies in the prior art, which is characterized in that it adopts mandrel rotary head and conical mandrel expansion, effectively preventing stagnation Material phenomenon and serious pollution of the inner wall of the pipe

Method used

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  • Method for making double-axial hard polyvinyl chloride tubular material
  • Method for making double-axial hard polyvinyl chloride tubular material
  • Method for making double-axial hard polyvinyl chloride tubular material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 100 kg of polyvinyl chloride, 3 kg of tribasic lead sulfate, 1.6 kg of acrylate, 0.8 kg of paraffin, 6 kg of light calcium carbonate and 0.3 kg of pigment, and put them into a high-speed mixer, and mix at a temperature of 110 ° C for 25 minutes, discharge, input into the cold mixer, cool to below 40℃ while mixing, discharge, sieve, remove agglomerates and sticky melts, and obtain rigid PVC powder. The above-mentioned mixture of rigid polyvinyl chloride is added to the gradient single-screw extruder for continuous molding, and the molding temperature is: the barrel temperature of the feeding section is 120 ° C, the temperature of the barrel of the melting section is 175 ° C, and the temperature of the barrel of the metering section is 165 ° C. Then, the tube blank is extruded through the die and subjected to the action of the traction device to achieve axial stretching orientation, and then enters the setting auxiliary machine, and then is heated by the heating box. ...

Embodiment 2

[0030] 100 kg of polyvinyl chloride, 3 kg of dibasic lead stearate, 1.5 kg of chlorinated polyethylene, 0.8 kg of polyethylene wax, 8 kg of heavy calcium carbonate and 0.3 kg of pigment were added into a high-speed mixer, and the mixture was heated to a temperature of 120°C, kneading for 25 minutes, discharging, inputting into a cold mixer, cooling to a temperature below 40°C while mixing, discharging, sieving, removing agglomerates and sticky melts to obtain rigid polyvinyl chloride powder. Then the mixture of the above-mentioned rigid polyvinyl chloride is added to the parallel and counter-rotating twin-screw extruder for continuous molding. ℃, then the tube blank is extruded through the die and subjected to the action of the traction device to realize the axial stretching orientation, and then enters the setting auxiliary machine, and then is heated by the infrared rays of the heating box. Radial expansion, and then through conventional treatments such as pressing rollers, ...

Embodiment 3

[0032] 100 kg of polyvinyl chloride, 0.5 kg of lead stearate, 2.5 kg of acrylic acid-butadiene-styrene copolymer, 3 kg of organic tin, 8 kg of talc and 0.3 kg of pigment were added into a high-speed mixer, and the mixture was heated to 100 ~120℃, knead for 30 minutes, discharge, input into cold mixer, cool to below 40℃ while mixing, discharge, sieve, remove agglomerates and sticky melts to obtain rigid polyvinyl chloride powder. Then, the mixture of the above-mentioned rigid polyvinyl chloride is added to the conical counter-rotating twin-screw extruder for continuous molding. 175℃, then the tube blank is extruded through the die and subjected to the action of the traction device to achieve axial stretching orientation, and then enters the setting auxiliary machine, and then is heated by the infrared rays of the heating box. The radial expansion is realized, and then the biaxially oriented rigid PVC pipe products are obtained by conventional treatments such as pressing roller ...

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Abstract

The production method of biaxial oriented hard polyvinyl chloride pipe material includes: using 100 portions of polyvinyl chloride, 2-6 portions of stabilizing agent, 1-12 portions of toughening agent, 0.1-1.5 portions of lubricating agent, 5-15 portions of filling material and proper quantity of colouring matter and adding them into a high-speed mixing machine, mixing them at 100-120 deg.C for 20-40 min., discharging, sieving, removing block and viscous melt material to obtain hard polyvinyl chloride premixed powder material, adding said mixture material into extrude single screw or extruder twin screw to make continuous forming at 100-180 deg.C, then making the obtained material undergo the processes of extruding pipe blank, stretching orientation, heating to 100-120 deg.C to implement radial expansion, forming, cooling, drawing and cutting.

Description

1. Technical field [0001] The invention relates to a method for manufacturing a biaxially oriented rigid polyvinyl chloride pipe, which belongs to the field of polymer forming and processing. 2. Background technology [0002] U.S. Patent U.S.6296804 discloses a method for manufacturing biaxially oriented plastic pipes by means of traction and transverse gas expansion. This patent is that after the pipe is extruded from a die by an extruder, it undergoes shaping cooling, traction and conveying, and heating the outer wall of the pipe. The inner wall is filled with hot compressed air or hot pressure oil, and the inner wall is closed under pressure and lateral expansion; in the secondary high-speed traction, longitudinal stretching is obtained, and then shaped and cooled to form longitudinal and transverse biaxially stretched plastic pipe fittings . The disadvantage of this patented technology is that the plastic heating speed is slow and the production efficiency is low; secon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C48/355B29C55/26
Inventor 刘廷华黄锐陈力辉陈鹊杨明华
Owner SICHUAN UNIV
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