Preparation method for preparing high-strength polypropylene foamed beads (EPP) with low irradiation intensity

A technology of expanded beads and polypropylene, which is applied in the field of expanded polypropylene particles and its preparation, and can solve problems such as no large-scale application

Inactive Publication Date: 2019-11-22
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

Although EPP materials have huge potential market applications, from the product application market and literature research, the raw materials for real industrial appli

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) 300g of copolymerized polypropylene, 4g of octadecyl glycidyl methacrylate, and 0.6g of stabilizer 1010 were mixed uniformly by a high-speed mixer and then added to a parallel twin-screw extruder for compounding and granulation. After drying After irradiating with 3.5KGry high-energy electron rays, add 4g of functional additives and blend them with a high-speed mixer, then add twin-screws to re-extrude water-cooled strands and pelletize to obtain small modified polypropylene particles with a length of 1.5mm and a diameter of 1.2mm ;

[0022] (2) Put polypropylene 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 130°C and the pressure to 3MPa, after reaching the set temperature and pressure, keep it for 30min to make the foaming agent penetrate into the polypropylene particles;

[0023] (3) The pressure release of the autoclave is control...

Embodiment 2

[0026] (1), 300g of copolymerized polypropylene, 7g of glycidyl methacrylate, stabilizer 1010 0.6g, 168 0.3g are mixed uniformly by a high mixer, then added to a parallel twin-screw extruder for compounding and granulation, after drying, After irradiating 6.0KGry high-energy electron rays, add 2g of chain extender bisphenol A, 4g of functional additives after blending in a high-speed mixer, add twin-screws to re-extrude water-cooled strands and pelletize them to obtain 1.5mm in length and 1.2 in diameter Modified polypropylene small particles;

[0027] (2) Put polypropylene 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 126°C and the pressure to 2.5MPa, after reaching the set temperature and pressure, keep it for 30 minutes to make the foaming agent penetrate into the polypropylene particles;

[0028] (3) The pressure release of the autoclave is ...

Embodiment 3

[0030](1) Mix 300g of polypropylene copolymer, 2g of octadecyl glycidyl methacrylate, and 0.6g of stabilizer 1010 into a parallel twin-screw extruder for compounding and granulation, after drying After being irradiated by 7.5KGry high-energy electron rays, 1.5g of ethylenediamine and 4g of functional additives were blended by a high-speed mixer, and then added into twin-screws to re-extrude water-cooled strands and pelletize them to obtain 1.5mm in length and 1.2 in diameter. Modified polypropylene small particles;

[0031] (2) Put polypropylene 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 130°C and the pressure to 3MPa, after reaching the set temperature and pressure, keep it for 30min to make the foaming agent penetrate into the polypropylene particles;

[0032] (3) The pressure release of the autoclave is controlled, and the polypropylene pa...

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Abstract

The invention relates to a preparation method for preparing high-strength polypropylene foamed beads (EPP) with low irradiation intensity. The method comprises the following steps: 1, blending and granulating co-polypropylene with the melting point lower than 150 DEG C, glycidyl methacrylate (ether) and a stabilizer in a parallel twin-screw extruder; irradiating by high-energy electron rays; thenadding carboxyl-, or hydroxyl-, or amino-terminated long-chain structure substance, or carboxyl, or hydroxyl, or amino substance with two or more functional groups at the tail end as a chain extenderand other functional additives; extruding again by using double screws, carrying out water-cooling bracing granulation, drying, and foaming by using a physical foaming agent intermittent kettle methodto obtain the high-melt-strength polypropylene foamed beads (EPP). The processing process is green and pollution-free, and the structure of the materials are controllable; the random polypropylene foam material prepared by the method is low in VOC (volatile organic compound) content, pressure-resistant, buffering and heat-insulating, has excellent high strength, high resilience, shock absorption,energy absorption, heat resistance and oil resistance, is easy to mold and form, and can be widely applied to the fields of military industry, automobiles, buildings, children toys, food packaging materials, household appliances and the like.

Description

technical field [0001] The invention relates to the technical field of polymer foam materials, and more specifically, the invention relates to a polypropylene foam particle and a preparation method thereof. Background technique [0002] EPP has a special cell structure (good cushioning), excellent shock resistance and energy absorption, light specific gravity (17-100kg / m3), high recovery rate after deformation, chemical resistance, and wide service temperature (-40 ° C ~ 110 ° C ), wide range of foaming ratio (5-60 times), oil resistance and heat insulation, etc. At the same time, the odor level of EPP can be controlled within 2.5, no organic volatiles, no benzene, aldehydes, ketones and other harmful substances , which can meet the strict requirements of automotive OEMs on the smell of automotive interiors. Because of these advantages at the same time, EPP is widely used in automobiles, such as car bumpers, seat systems, trunk tool boxes, car sun visors, buffer protection ...

Claims

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Application Information

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IPC IPC(8): C08J9/16C08J9/228C08J9/12C08L51/06
CPCC08J9/122C08J9/16C08J9/228C08J2351/06
Inventor 宫瑞英陈静鹤韩冲李朝旭孙并臻鞠学刚
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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