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Polystyrene continuous multilayer coextruded foam insulation composite pipe and manufacturing method thereof

A technology of polystyrene and multi-layer co-extrusion, which is applied in the direction of heat preservation, protection of pipes through heat insulation, coating, etc., can solve the problems of ozone layer destruction, foaming materials cannot be recycled, and high cost, so as to reduce greenhouse gas emissions, Realize the effect of low-carbon circular economy and stable product performance

Inactive Publication Date: 2018-07-24
淄博洁林塑料制管有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the insulation of heating pipes is mainly made of polyurethane materials. Since the foaming agents used in polyurethane foaming are mainly chlorofluorocarbons, which have a destructive effect on the ozone layer, countries around the world are currently restricting their use.
During the foaming process of polyurethane materials, there will be isocyanate residues that are harmful to the human body, and the foamed materials cannot be recycled, causing environmental pollution
At the same time, the cost of polyurethane material is relatively high, and the foaming efficiency is low, resulting in high cost of pipe insulation
[0003] At present, polystyrene foaming requires the use of butane or similar low-molecular-weight alkane foaming agents, which have high requirements for foaming equipment, production, transportation, and storage environments, and current polystyrene foaming is mainly used for sheet production , not widely used in the field of pipeline insulation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1) Prepare materials by weight: 90 parts of polystyrene or high-impact polystyrene, 10 parts of low-density polyethylene, 5 parts of nucleating agent, 2.5 parts of antioxidant, CO 2 6.2 parts, ethanol: 2.5 parts, water 2.5 parts; polystyrene or high-impact polystyrene and low-density polyethylene blends, nucleating agents, and antioxidants are mixed evenly with a high-speed mixer according to the proportion;

[0031] 2) Put the mixed raw materials into the twin-screw extruder for plasticization and melting, and then inject supercritical CO 2 The foaming agent composed of , ethanol, and water is extruded through the pipe forming die and core die, and the pressure of the melt drops rapidly after exiting the die, so that the CO 2 The gas forms cells around the nucleating agent, forming CO 2 Foamed blended polystyrene insulation;

[0032] 3) Prepare materials by weight: 70 parts of polyethylene resin, 30 parts of ethylene-vinyl acetate copolymer, using a co-extrusion mach...

Embodiment 2

[0035]1) Prepare materials by weight: 85 parts of polystyrene or high-impact polystyrene, 12 parts of low-density polyethylene, 4 parts of nucleating agent, 3 parts of antioxidant, CO 2 5.5 parts, ethanol: 3 parts, water 2 parts; mix polystyrene or high-impact polystyrene and low-density polyethylene blends, nucleating agents, and antioxidants in a high-speed mixer according to the proportion;

[0036] 2) Put the mixed raw materials into the twin-screw extruder for plasticization and melting, and then inject supercritical CO 2 The foaming agent composed of , ethanol, and water is extruded through the pipe forming die and core die, and the pressure of the melt drops rapidly after exiting the die, so that the CO 2 The gas forms cells around the nucleating agent, forming CO 2 Foamed blended polystyrene insulation;

[0037] 3) Prepare materials by weight: 60 parts of polyethylene resin, 40 parts of ethylene-vinyl acetate copolymer, using a co-extrusion machine in CO 2 The outer...

Embodiment 3

[0040] 1) Prepare materials by weight: 95 parts of polystyrene or high-impact polystyrene, 8 parts of low-density polyethylene, 6 parts of nucleating agent, 2 parts of antioxidant, CO 2 7.5 parts, ethanol: 2 parts, water 3 parts; polystyrene or high-impact polystyrene and low-density polyethylene blends, nucleating agents, and antioxidants are mixed evenly with a high-speed mixer according to the proportion;

[0041] 2) Put the mixed raw materials into the twin-screw extruder for plasticization and melting, and then inject supercritical CO 2 The foaming agent composed of , ethanol, and water is extruded through the pipe forming die and core die, and the pressure of the melt drops rapidly after exiting the die, so that the CO 2 The gas forms cells around the nucleating agent, forming CO 2 Foamed blended polystyrene insulation;

[0042] 3) Prepare materials by weight: 80 parts of polyethylene resin, 20 parts of ethylene-vinyl acetate copolymer, using a co-extrusion machine in ...

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Abstract

The invention discloses a polystyrene continuous multilayer coextruded foam insulation composite pipe and manufacturing method thereof, and belongs to the technical field of heating pipelines in buildings and communities. The polystyrene continuous multilayer coextruded foam insulation composite pipe is characterized by comprising an inner CO2 foam blended polystyrene insulation layer and an outerpolyethylene-vinyl acetate copolymer protection layer, which are co-extruded. The manufacturing method comprises the following steps of: uniformly mixing polystyrene or high-impact polystyrene with alow-density polyethylene blend, a nucleating agent and an antioxidant according to matching by adoption of a high-speed mixer; adding the mixed raw materials into a double-screw extruder to carry outplasticization and fusion; injecting a foaming agent which is in a super-critical state and is formed by CO2, ethyl alcohol and water; and coextruding the polyethylene-vinyl acetate copolymer protection layer by utilizing a coextrusion machine so as to obtain the polystyrene continuous multilayer coextruded foam insulation composite pipe. The polystyrene continuous multilayer coextruded foam insulation composite pipe is high in production efficiency and stable in product performance.

Description

technical field [0001] The invention discloses a polystyrene continuous multi-layer co-extrusion foaming thermal insulation composite pipe and a manufacturing method thereof, which belong to the technical field of heating pipes in buildings and communities. Background technique [0002] At present, the insulation of heating pipes is mainly made of polyurethane materials. Since the foaming agents used in polyurethane foaming are mainly chlorofluorocarbons, which have a destructive effect on the ozone layer, their use is currently restricted by countries all over the world. During the foaming process of polyurethane materials, there will be isocyanate residues harmful to the human body, and the foamed materials cannot be recycled, causing environmental pollution. At the same time, the cost of polyurethane material is high, and the foaming efficiency is low, resulting in high cost of pipe insulation. [0003] At present, polystyrene foaming requires the use of butane or simila...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L9/12F16L59/14C08L23/06C08L23/08C08L25/06C08L51/04C08J9/12B29C47/00B29C47/02B29C47/06B29C44/24
CPCB29C44/24B29C48/0012B29C48/09B29C48/151B29C48/18C08J9/0061C08J9/122C08J2203/06C08J2203/08C08J2325/06C08J2351/04C08J2423/06C08L23/06F16L9/12F16L59/14C08L23/0853
Inventor 刘利强贾生廷韩波王洪波
Owner 淄博洁林塑料制管有限公司