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Method for preparing high-strength anti-retraction microporous expandable polyethylene (EPE) beads

A technology of microporous polyethylene and high-density polyethylene, applied in the field of polymer modification processing, can solve the problems of flammability and explosion, large material loss, poor resilience and so on

Inactive Publication Date: 2019-12-24
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current low-density polyethylene foam materials still have disadvantages such as low strength, poor resilience, and uneven cells. Currently, the polyethylene foam beads (pearl cotton) that exist on the market mostly use organic foaming agents, which are easy to produce. Flammable and explosive, low production efficiency, high energy consumption, poor plasticity for special-shaped products, prone to cell collapse during the preparation process, resulting in complex preparation process, high scrap rate and large material loss in the production process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1), linear low-density polyethylene LDPE, 225g; high-density polyethylene HDPE75 g; α crystal nucleating agent light calcium carbonate 0.8g, α crystal nucleating agent NA-11 0.1g, α crystal nucleating agent sorbitol (3904) 0.2g, auxiliary agent 8g. Fully compounded by a high-mixer, extruded by a twin-screw and pelletized by water-cooled strands, to obtain small modified polyethylene particles with a length of 1.2mm and a diameter of 1mm; (2), put polyethylene particles, dispersant, and water into the autoclave In the process, the physical foaming agent was injected into the autoclave under stirring conditions, and the temperature of the autoclave was raised to 110°C and the pressure was raised to 2.0MPa. After reaching the set temperature and pressure, keep it for 20min to make the The foaming agent penetrates into the polyethylene particles;

[0019] (3) The pressure release of the autoclave is controlled, and the polyethylene particle-high-pressure water dispersion ...

Embodiment 2

[0022] (1), LDPE, linear low density polyethylene, 195g; 105g of atactic polypropylene with a melting point of 132°C; α crystallization nucleating agent calcium micaate 0.5g, α crystallization nucleating agent NA-10 0.1g, α crystallization nucleating agent Sorbitol (3988) 0.2g, auxiliary agent 10g. Fully compounded by a high-speed mixer, and pelletized by twin-screw extrusion and water-cooled strands to obtain small modified polyethylene particles with a length of 1.8mm and a diameter of 1.5mm;

[0023] (2), put polyethylene particles, dispersant, and water into the autoclave, inject the physical foaming agent into the autoclave under stirring conditions, and raise the temperature of the autoclave to 107°C and the pressure to 2.8MPa, after reaching the set temperature and pressure, keep it for 25min to make the foaming agent penetrate into the polyethylene particles;

[0024] (3) The pressure release of the autoclave is controlled, and the polyethylene particle-high-pressure ...

Embodiment 3

[0028] (1), linear low-density polyethylene LDPE, 240g; 60g of atactic polypropylene with a melting point of 145°C; 0.2g of α crystallization nucleating agent sodium benzoate, 0.1g of α crystallization nucleating agent NA-21, and α crystallization nucleating agent Sorbus Alcohol (3988) 0.2g, auxiliary agent 10g. Fully compounded by a high-speed mixer, and pelletized by twin-screw extrusion and water-cooled strands to obtain small modified polyethylene particles with a length of 1.8mm and a diameter of 1.5mm;

[0029] (2), put polyethylene particles, dispersant, and water into the autoclave, inject the physical foaming agent into the autoclave under stirring conditions, and at the same time raise the temperature of the autoclave to 112 ° C, and the pressure to 3.0MPa, after reaching the set temperature and pressure, keep it for 25min to make the foaming agent penetrate into the polyethylene particles;

[0030] (3) The pressure release of the autoclave is controlled, and the poly...

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Abstract

According to the invention, a conventional nucleating agent suitable for regulating and controlling the crystallization behavior of polypropylene is applied to control the crystallization behavior ofpolyethylene, and the invention discloses a method for controlling assembling and preparing microporous expandable polyethylene beads by using different crystallization behaviors. 20-95 parts of linear low-density polyethylene adopted as matrix resin; 10-45 parts of high-density polyethylene or atactic polypropylene (the melting point is 130-150 DEG C); 0.05-5 parts of alpha-crystal nucleating agents comprising an inorganic nucleating agent with an alpha-crystal nucleating function, aromatic carboxylate, sorbitol and the like; and 1-15 parts of an auxiliary agent are utilized in the method. Extruding and granulating steps are performed by adopting a double-screw extruder. During production, an intermittent method is adopted; different crystallization nucleating agents are used for coordinating layer-by-layer assembling crystallization, rigidity increasing changes generated by the polypropylene alpha crystallization nucleating agents are flexibly combined with the crystallization speed,the size of crystal particles and the growth and solidification process of foam holes of a foam material, and the microporous expandable polyethylene beads good in performance and resistant to retraction are prepared.

Description

technical field [0001] A method for high-strength shrinkage-resistant microporous polyethylene foam beads (EPE) The invention relates to polyethylene foam beads and belongs to the field of polymer modification processing. The present invention adopts intermittent or continuous physical foaming method, utilizes different crystallization nucleating agents to coordinate layer-by-layer assembly crystallization, and combines the rigidity change produced by the polypropylene α crystallization nucleating agent, the speed of crystallization, the size of crystallization particles and the foaming The growth and curing process of the material cells is flexibly combined, and the cell structure of the produced polyethylene expanded beads (EPE) is evenly distributed, and the cell size of the prepared materials is between 20 and 50 μm. Cellular polyethylene foam beads. Background technique [0002] Low-density polyethylene foam has excellent physical, chemical and mechanical properties. ...

Claims

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Application Information

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IPC IPC(8): C08J9/18C08L23/08C08L23/06C08L23/12
CPCC08J9/0061C08J9/122C08J9/18C08J2203/06C08J2203/08C08J2323/08C08J2323/12C08J2423/06
Inventor 宫瑞英孙德春李朝旭韩冲杜庆霞孙并臻
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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