Manufacturing process of large-aperture variable-turn-angle PVC (polyvinyl chloride) pipe

A PVC pipe material and preparation technology, applied to tubular objects, other household appliances, household appliances, etc., can solve the problems of high hardness, poor flexibility, and increased cost of PVC pipes, and achieve simple processing and manufacturing processes, convenient use, and increased production cost effect

Inactive Publication Date: 2014-04-02
山东华信塑胶股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with other polyolefin pipes, PVC pipes have the advantages of high strength, good flame retardancy, high ring stiffness, excellent weather resistance, and low price, and are widely used. However, PVC pipes have high hardness and poor flexibility, and cannot be used like PE It is bent in such a way that the PVC pipes prepared by the existing technology are all straight pipes, so that pipe fittings must be used to connect the corners during the construction process, especially large-diameter pipes, which not only increases the cost, but also becomes a problem that affects the quality of the project. key factor

Method used

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  • Manufacturing process of large-aperture variable-turn-angle PVC (polyvinyl chloride) pipe
  • Manufacturing process of large-aperture variable-turn-angle PVC (polyvinyl chloride) pipe
  • Manufacturing process of large-aperture variable-turn-angle PVC (polyvinyl chloride) pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] A process for preparing variable-angle PVC pipes with a caliber of 630mm, the process steps are as follows:

[0051] (1) Mixing: 100kg SG-4 PVC resin powder, 0.4kg calcium zinc stabilizer, 2kg rubber toughening agent, 2kg inorganic rigid particle calcium carbonate, 0.5kgACR-201 processing aid, 0.6kg polyethylene wax (PE wax), 0.5kg of stearic acid, 0.05kg of hindered phenolic antioxidant BHT, 0.03kg of rutile titanium dioxide and 1kg of precipitated barium sulfate were put into a high-speed mixer for hot mixing, and the mixture was heated to 90°C After reaching the temperature, it is cold-mixed by a high-speed mixer, and the mixed material is cold-mixed to 25°C, and then put into a drying silo to obtain a mixed material;

[0052] (2) Extrusion: Put the mixed material obtained in step (1) into a conical twin-screw extruder to extrude the pipe. Head temperature: 170°C; host speed: 10 rpm, feeding speed: 10 rpm;

[0053] (3) Cooling and shaping: The pipe extruded in step...

Embodiment 2

[0062] A process for preparing variable-angle PVC pipes with a diameter of 800mm, the process steps are as follows:

[0063] (1) Mixing: 100kg SG-5 PVC resin powder, 4kg lead salt stabilizer, 6kg thermoplastic elastomer toughener, 8kg organic rigid particle acrylonitrile-styrene copolymer (AS), 3kgACR-401 processing aid Agent, 1.5kg paraffin wax, 1kg calcium stearate, 101 parts of 0.5kg hindered phenolic antioxidant, 3kg anatase titanium dioxide and 5kg calcium carbonate were put into a high-speed mixer and heated to 120 °C, after reaching the temperature, it is cold-mixed by a high-speed mixer, and the mixed material is cold-mixed to 45 °C, and then put into the drying silo to obtain the mixed material;

[0064] (2) Extrusion: Put the mixed material obtained in step (1) into a conical twin-screw extruder to extrude the pipe. Head temperature: 220°C; host speed: 90 rpm, feeding speed: 90 rpm;

[0065] (3) Cooling and shaping: The pipe extruded in step (2) is shaped according...

Embodiment 3

[0074] A process for preparing variable-angle PVC pipes with a caliber of 700mm, the process steps are as described in Example 1, the difference is: step (1) mixing: take 100kg SG-5 type PVC resin powder, 2kg organotin stabilizer , 3kg thermoplastic elastomer toughener, 5kg organic rigid particle acrylonitrile-styrene copolymer (AS), 1kgACR-401 processing aid, 1kg microcrystalline wax, 1kg calcium stearate, 0.5kg hindered phenolic anti Oxygen agent 1010, 1kg anatase titanium dioxide and 2kg calcium carbonate were put into a high-speed mixer for hot mixing, and the mixture was hot-mixed to 90°C. Put it into the drying silo after 45°C to get the mixed material;

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Abstract

The invention relates to a manufacturing process of a large-aperture variable-turn-angle PVC (polyvinyl chloride) pipe. The manufacturing process comprises the following five steps: mixing, extruding, performing cooling and forming, performing fixed-length cutting, flaring and packaging for sale. According to the manufacturing process, an improved flaring mould is adopted, so that a pipe opening of the large-aperture PVC pipe can be bent at a small angle, the problem that an existing PVC straight pipe makes a turn through a connecting piece is solved, and a processing process of the flaring step is correspondingly changed; a process step of horizontally rotating the flaring mould is added on the basis of an existing flaring machine, so that the large-aperture PVC pipe can be bent; the flaring mould in the process is convenient to use, the effect is remarkable, the manufacturing process is simple, and good economic benefit can be created.

Description

technical field [0001] The invention relates to a large-diameter variable-angle PVC pipe preparation process, which belongs to the technical field of polyvinyl chloride (PVC) pipes. Background technique [0002] In the water supply system, plastic pipes have the characteristics of non-corrosion, good hygienic performance, and easy installation. They have been vigorously promoted in our country, and it is the general trend to replace traditional galvanized iron pipes. Plastic water supply pipes mainly include polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP) and so on. Compared with other polyolefin pipes, PVC pipes have the advantages of high strength, good flame retardancy, high ring stiffness, excellent weather resistance, and low price, and are widely used. However, PVC pipes have high hardness and poor flexibility, and cannot be used like PE It is bent in such a way that the PVC pipes prepared by the existing technology are all straight pipes, so that pipe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29D23/00B29C57/04
Inventor 汤毅张磊赵际伟刘绪玲
Owner 山东华信塑胶股份有限公司
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