Polyethylene foaming material preparation method and polyethylene foaming material prepared by preparation method

A technology for polyethylene foaming and low-density polyethylene, which is applied in the petrochemical field, can solve the problems such as the inability to effectively control the foaming stability of polyethylene resin, the inability to prepare uniform cells, the cumbersome preparation method, and the like, and the preparation method is simple and easy. Effects of handling, cell uniformity, thickness dimensional stability

Inactive Publication Date: 2020-01-07
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The main purpose of the present invention is to provide a preparation method of polyethylene foam material and the polyethylene foam material prepared therefrom, so as to solve the problem that the preparation method of polyethylene foam material in the prior art is cumbersome, difficult to operate and ineffective. The problem of controlling the foaming stability of polyethylene resin and the inability to prepare polyethylene foaming materials with uniform cells, high expansion ratio, thicker thickness and excellent dimensional stability

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  • Polyethylene foaming material preparation method and polyethylene foaming material prepared by preparation method
  • Polyethylene foaming material preparation method and polyethylene foaming material prepared by preparation method

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preparation example Construction

[0023] As described in the background technology section, the existing preparation methods of polyethylene foam materials are cumbersome and difficult to operate, cannot effectively control the foam stability of polyethylene resin, and cannot prepare foams with uniform cells, high expansion ratio, and thicker thickness. And the problem of polyethylene foam material with excellent dimensional stability. In order to solve the above problems, the present invention provides a method for preparing a polyethylene foam material, the preparation method comprising the following steps: (a) mixing the matrix resin with a processing aid to form a mixture; (b) extruding the mixture Forming the parison; (c) preheating the parison at a temperature of 110°C to 150°C for 10 to 30 minutes, and heating the preheated parison at a temperature of 190°C to 230°C and a pressure of 0.05MPa to 0.2MPa Carry out crosslinking and foaming, and cool and shape the parison after crosslinking and foaming at a ...

Embodiment 1

[0040] Mix low-density polyethylene (LDPE) and processing aids uniformly through a high-speed mixer, then melt and extrude granules through a twin-screw extruder, control the extrusion temperature at 135°C, and then pass the granulated pellets through the extruder A secondary extrusion into a sheet was performed at an extrusion temperature of 135°C. Place the sheet in a foaming device (industrial tubular foaming furnace provided by Shanghai Shengzhong Furnace Industry Co., Ltd.) for preheating at a temperature of 150°C, and then enter the crosslinking and foaming section at a temperature of 220°C , the pressure is 0.2MPa, and the foaming time is 7min. Finally, the foamed sheet is obtained by cooling and shaping at 60°C and normal pressure. See Table 1 for the formula based on 100 parts by weight of the matrix resin, and see Table 2 for the sample performance test results and test standards.

Embodiment 2

[0042] Mix low-density polyethylene (LDPE) and processing aids uniformly through a high-speed mixer, then melt and extrude granules through a twin-screw extruder, control the extrusion temperature at 135°C, and then pass the granulated pellets through the extruder A secondary extrusion into a sheet was performed at an extrusion temperature of 135°C. Place the sheet in a foaming device (industrial tubular foaming furnace provided by Shanghai Shengzhong Furnace Industry Co., Ltd.) for preheating at a temperature of 110°C, and then enter the crosslinking and foaming section at a temperature of 230°C , the pressure is 0.05MPa, and the foaming time is 7min. Finally, the foamed sheet is obtained by cooling and shaping at 70°C and normal pressure. See Table 1 for the formula based on 100 parts by weight of the matrix resin, and see Table 2 for the sample performance test results and test standards.

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Abstract

The invention provides a polyethylene foaming material preparation method and a polyethylene foaming material prepared by the preparation method. The preparation method comprises: (a) mixing a matrixresin and a processing aid to form a mixture; (b) extruding the mixture to form a molding billet; and (c) preheating the molding billet at a temperature of 110-150 DEG C for 10-30 min, carrying out cross-linking and foaming on the preheated molding billet at a temperature of 190-230 DEG C under a pressure of 0.05-0.2 MPa, and carrying out cooling shaping on the cross-linked and foamed molding billet at a temperature of 60-80 DEG C under a normal pressure to obtain the polyethylene foaming material, wherein the matrix resin comprises low-density polyethylene, and the processing aid comprises across-linking agent, a foaming agent, a nucleating agent and a surfactant. According to the invention, the preparation method is simple, convenient and easy to operate, the foaming stability of the polyethylene resin can be well controlled, and the polyethylene foaming material prepared by the method is high in foaming ratio, uniform in foam holes, high in size stability, and is suitable for preparing foaming products with high quality.

Description

technical field [0001] The invention relates to the field of petrochemistry, in particular to a preparation method of polyethylene foam material and the polyethylene foam material prepared therefrom. Background technique [0002] Foamed plastics are plastics that contain countless micropores in the whole, so foamed plastics are two-phase systems in which plastics form a continuous phase and gas is used as a dispersed phase. Due to the existence of the gas phase, foamed plastics have the advantages of low density, heat insulation, sound absorption, shock resistance, etc., and are widely used in various fields such as automobiles, navigation, construction, heat insulation, packaging, and civil use. , good performance, wide application and other characteristics, so the market prospect is good. [0003] The chemically cross-linked polyethylene foam material is a closed-cell type. Due to its low crystallinity and low apparent density, it is generally a semi-rigid foam material, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08L23/08C08L23/16C08K5/14C08J3/24C08J9/10
CPCC08J3/24C08J3/246C08J9/0023C08J9/0061C08J9/103C08J2203/04C08J2323/06C08J2423/08C08J2423/16C08K5/14
Inventor 李晓东王硕陈光岩李连鹏
Owner PETROCHINA CO LTD
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