Extruded expanded polypropylene beads and preparation method thereof

A technology for extruding foam and polypropylene, applied in the field of polymer foam material production, can solve the problems of inapplicability, complex production process, difficult to achieve, etc., and achieve the effects of high mechanical strength, thermal deformation temperature, and high production efficiency

Inactive Publication Date: 2011-12-28
CGN JUNER NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of using organic peroxide to treat the surface of foam beads will leave peroxide and its decomposition products in the foamed products, so it cannot be applied to areas with hygiene requirements in contact with food; and peroxide and its decomposition products It has an impact on the service life of the product; in addition, the production process is relatively complicated, and it is difficult to achieve in the process of extrusion foaming

Method used

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  • Extruded expanded polypropylene beads and preparation method thereof
  • Extruded expanded polypropylene beads and preparation method thereof
  • Extruded expanded polypropylene beads and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] With 4 kilograms of beta nucleating agent masterbatch, 96.4 kilograms of high melt strength polypropylene (RS1684, Basell Company), 0.1 kilogram of antioxidant 168, 0.2 kilogram of antioxidant 1010, put into extruder after mixing uniformly and extrude For foaming, materials can be continuously added according to the above raw material ratio for continuous production. The extrusion speed of materials is controlled at 40 kg per hour, the injection speed of supercritical carbon dioxide is controlled at 3 kg per hour, and the head pressure is 18 MPa. The head temperature is 160°C, and the water temperature of the underwater pelletizer is controlled at 60°C to obtain expanded polypropylene beads with an expansion ratio of 30 times. The DSC curve of the expanded polypropylene beads is shown in figure 1 .

[0045] The obtained foamed polypropylene beads are put into a thermoforming machine for molding, the steam pressure is 0.4 MPa (welding temperature is 144° C.), the surfac...

Embodiment 2

[0047] With 6 kilograms of β-nucleating agent masterbatch, 94.6 kilograms of high melt strength polypropylene (RS1684, Basell Company), 0.1 kilogram of antioxidant 168, 0.2 kilogram of antioxidant 1010, 0.5 kilogram of paraffin, put into extrusion after mixing uniformly Extrusion and foaming in the machine can continuously add materials according to the ratio of the above raw materials for continuous production. The extrusion speed of the materials is controlled at 40 kg per hour, and the injection speed of supercritical carbon dioxide is controlled at 2.8 kg per hour. The pressure is 15MPa, the head temperature is 170°C, and the water temperature of the underwater pelletizer is controlled at 40°C to obtain expanded polypropylene beads with an expansion ratio of 27 times. The DSC curve of the expanded polypropylene beads is shown in image 3 .

[0048] The obtained foamed polypropylene beads are put into a thermoforming machine for molding, the steam pressure is 0.45 MPa (wel...

Embodiment 3

[0050] 4 kg of β-nucleating agent masterbatch, 96.4 kg of high melt strength polypropylene (RS1684, Basell), 0.1 kg of antioxidant 168, 0.2 kg of antioxidant 1010, and 1 kg of black masterbatch were mixed evenly and put into the extruder Extrude and foam in the extruder, the materials can be continuously added according to the ratio of the above raw materials for continuous production, the extrusion speed of the materials is controlled at 40 kg per hour, and the injection speed of supercritical carbon dioxide is controlled at 2.8 kg per hour. The head pressure is 16MPa, the head temperature is 160°C, and the water temperature of the underwater pelletizer is controlled at 60°C to obtain black expanded polypropylene beads with an expansion ratio of 29 times.

[0051] Put the obtained black foamed polypropylene beads into a thermoforming machine for molding, the steam pressure is 0.41MPa (welding temperature: 145°C), the surface of the obtained product is smooth, and the foamed be...

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Abstract

The invention discloses extrusion expanded polypropylene beads, which comprise 100 weight parts of polypropylene, 0.02 to 0.6 weight part of beta nucleating agent, 0 to 0.6 weight part of antioxygen, 0 to 2 weight parts of lubricating agent, 0 to 3 weight parts of foaming nucleating agent and 0 to 2 weight parts of colorizing agent. The invention also discloses the preparation method of the extrusion expanded polypropylene beads. The method is simple in operation, can be used for continuous production and is suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of production of polymer foaming materials, in particular to an extruded foamed polypropylene bead with relatively low thermoforming temperature and a preparation method thereof. Background technique [0002] Foam plastic has the advantages of light weight, heat insulation, sound insulation, cushioning, high specific strength, and low price, so it is widely used in the fields of packaging, industry, agriculture, transportation, military industry, aerospace industry, and daily necessities. Commonly used foams include expanded polystyrene (PS), expanded polyethylene (PE), expanded polypropylene (PP) and expanded polyurethane (PU). [0003] Compared with traditional foamed PS and foamed PE, foamed PP has many unique advantages: (1) Excellent heat resistance, foamed PS is usually used at 80°C, foamed PE can only withstand 70-80°C , while the foamed PP can withstand 120°C and can be used for a long time in a hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08K5/20C08J9/12C08J3/22
Inventor 卢军黄志杰祖勇
Owner CGN JUNER NEW MATERIALS
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