Extrusion molding process for pore-free PVC pipe

A PVC pipe, extrusion molding technology, applied in the direction of electrical components, tubular objects, plastic/resin/wax insulators, etc., to achieve the effect of convenient construction, excellent chemical stability, and easy maintenance

Inactive Publication Date: 2017-12-22
安徽博泰塑业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to ...

Method used

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  • Extrusion molding process for pore-free PVC pipe
  • Extrusion molding process for pore-free PVC pipe
  • Extrusion molding process for pore-free PVC pipe

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Example 1: Non-porous PVC pipe extrusion molding process, the pipe formulation includes PVC resin, impact modifier, stabilizer, processing modifier, filler, colorant and external lubricant, specifically prepared by the following steps : Various materials-weighing-kneading-extrusion granulation-extrusion molding-cooling molding-cutting-inspection-finished products;

[0041] 1) Mixing process

[0042] When mixing at high speed, the additive penetrates into the voids of the PVC resin, so that the additive is evenly dispersed in the resin. Considering that the temperature above 1000°C is conducive to the evaporation of water vapor in the material, the temperature of the heat mixer is set at 100-1200°C ;In order to allow the additives to fully contact with PVC particles and reduce the adsorption of fillers on the additives, the heat mixer should be started immediately after adding PVC resin, and then fed in the following order: stabilizer, various processing aids, color mat...

Embodiment 2

[0072] Example 2: Non-porous PVC pipe extrusion molding process, the pipe formulation includes PVC resin, impact modifier, stabilizer, processing modifier, filler, colorant and external lubricant, specifically prepared by the following steps : Various materials-weighing-kneading-extrusion granulation-extrusion molding-cooling molding-cutting-inspection-finished products;

[0073] 1) Mixing process

[0074] When mixing at high speed, the additive penetrates into the voids of the PVC resin, so that the additive is evenly dispersed in the resin. Considering that the temperature above 1000°C is conducive to the evaporation of water vapor in the material, the temperature of the heat mixer is set at 100-1200°C ;In order to allow the additives to fully contact with PVC particles and reduce the adsorption of fillers on the additives, the heat mixer should be started immediately after adding PVC resin, and then fed in the following order: stabilizer, various processing aids, color mat...

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Abstract

An extrusion molding process for a pore-free PVC pipe is characterized in that according to a pipe formula, a PVC resin and epoxy resin copolymer, an impact modifier, a stabilizer, a processing modifier, a filling agent, a pigment and an outer lubricant are adopted, and the extrusion molding process specifically comprises the following steps of preparing of various materials, weighing, kneading, extrusion pelleting, extrusion molding, cooling molding, cutting, checking and obtaining of a finished product. The plastic pipe has remarkable beneficial effects that the relative density is small and is 1/4-1/7 that of metal; the electric insulation property and the chemical stability are excellent; installation and construction are convenient, and maintaining is easy; the unit energy consumption is low, in the process of extrusion, conditions are provided for molding through constant changing for the temperature, expanding with heat and contracting with cold are carried out several times, and the materials can be combined more tightly through contracting and expanding; and cooling is carried out through cooling liquid, paraffin in the cooling liquid can rapidly fill up pores, and after molding, a pore-free state is achieved.

Description

Technical field: [0001] The invention relates to the field of pipeline preparation, in particular to a non-porous PVC pipe extrusion molding process. Background technique: [0002] PVC is a white powder with an amorphous structure, the degree of branching is small, the relative density is about 1.4, the glass transition temperature is 77-90°C, it begins to decompose at about 170°C, and it has poor stability to light and heat. When exposed to sunlight, it will decompose to produce hydrogen chloride, and further autocatalyze the decomposition, causing discoloration and rapid decline in physical and mechanical properties. In practical applications, stabilizers must be added to improve the stability to heat and light. [0003] The molecular weight of industrially produced PVC is generally in the range of 50,000 to 110,000, with a large polydispersity, and the molecular weight increases with the decrease of the polymerization temperature; there is no fixed melting point, it start...

Claims

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Application Information

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IPC IPC(8): B29C47/92B29C47/60B29C47/90C08B31/06C08L27/06H01B3/44C08K3/22C08K3/30B29L23/00B29C48/90B29C48/92
CPCB29L2023/22B29C48/505B29C48/901B29C48/92B29C2948/92704C08B31/066C08K2003/2206C08K2003/3045C08L27/06C08L2203/18C08L2205/02C08L2205/035H01B3/443C08L3/06C08L91/06C08L91/00C08L63/00C08L61/06C08K13/02C08K3/22C08K5/098C08K5/053C08K5/57C08K3/30
Inventor 张燕叶芝南崔亮郭兵张友亮张跃李明许光辉朱学超柏成锐
Owner 安徽博泰塑业科技有限公司
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