Injection molding grade physical foamed polypropylene material and preparation method thereof

A polypropylene material, physical foaming technology, applied in the field of polymer processing, can solve the problems of complex addition of components, long-term surface treatment, inability to perform injection molding, etc., to achieve the effect of reducing density, improving low temperature performance, and avoiding cracking

Active Publication Date: 2014-07-09
HEFEI GENIUS NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Chinese patent (CN 101352923A) discloses a preparation method for extruding physically foamed polypropylene beads, which is to set an injection port in the middle of the barrel of the screw extruder, and install a sleeve-type die and die surface pelletizer on the machine head. machine, adding polypropylene foaming material and its additives into the screw extruder, and then injecting alkane foaming agent into the barrel from the injection port, wherein the weight ratio of polypropylene foaming material to alkane is 10-25%, so that the cut The granulated material foams when it enters the atmosphere; this patent adds a certain amount of small molecule alkane foaming agent during the extrusion process, but this molding method is extrusion molding, and th

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] 1) Add 55 parts of polypropylene, 30 parts of high melt strength polyethylene (HMS-PE), 15 parts of maleic anhydride grafted ethylene-octene copolymer as a compatibilizer, and 0.5 parts of polyethylene wax as a dispersant into the high-mixer Mix at 80°C for 8 minutes;

[0051] 2) Put the mixed material into the twin-screw extruder with the temperature of each zone at 180-210°C to extrude and granulate;

[0052] 3) Put the particles into a special foaming injection molding machine, and pass into supercritical nitrogen foaming injection molding accounting for 50% by weight. The temperature of each section of the injection molding machine is 180-210°C, and the injection molding pressure of each section is 25MPa- 65MPa, and the holding pressure of each section is 15MPa-40MPa.

[0053]

Embodiment 2

[0055] 1) 93 parts of polypropylene, 5 parts of high melt strength polyethylene (HMS-PE), 2 parts of compatibilizer maleic anhydride grafted ethylene-octene copolymer, 1 part of antioxidant 1010, auxiliary antioxidant Add 1 part of agent 168, 1 part of light stabilizer UV531, and 1 part of dispersant polyethylene wax into a high-mixer at 90 ° C for 3 minutes;

[0056] 2) Put the mixed material into the twin-screw extruder with the temperature of each zone at 180-210°C to extrude and granulate;

[0057] 3) Add the particles into a special foaming injection molding machine, and feed supercritical nitrogen gas foaming injection molding with a weight percentage of 35%. The temperature of each section of the injection molding machine is 180-210°C, and the injection molding pressure of each section is 25MPa-65MPa , The holding pressure of each section is 15MPa-40MPa.

[0058]

Embodiment 3

[0060] 1) 70 parts of polypropylene, 20 parts of high melt strength polyethylene (HMS-PE), 10 parts of compatibilizer maleic anhydride grafted ethylene-octene copolymer, 0.5 parts of antioxidant 1010, auxiliary antioxidant Add 0.5 parts of agent 168, 0.7 parts of light stabilizer 2-hydroxy-4-n-octyloxybenzophenone, and 0.8 parts of dispersant polyethylene wax into a high-mixer at 85 ° C for 5 minutes;

[0061] 2) Put the mixed material into the twin-screw extruder with the temperature of each zone at 180-210°C to extrude and granulate;

[0062] 3) Put the particles into a special foaming injection molding machine, and feed supercritical nitrogen with a weight percentage of 45% for foaming injection molding. The temperature of each section of the injection molding machine is 180-210°C, and the injection molding pressure of each section is 25MPa-65MPa , The holding pressure of each section is 15MPa-40MPa.

[0063]

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PUM

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Abstract

The invention provides an injection molding grade physical foamed polypropylene material and a preparation thereof. The polypropylene material is prepared by mixing, extruding, foaming and injection-molding 55-93 parts of polypropylene, 5-30 parts of high melt strength polyethylene, 2-15 parts of a compatilizer, 0-1 part of a main antioxidant, 0-1 part of an auxiliary antioxidant, 0-1 part of a light stabilizer and 0.5-1 part of a dispersing agent. By modifying the polypropylene through a certain amount of the high melt strength polyethylene, the polypropylene material disclosed by the invention improves low temperature performance and mobility; moreover, the material is foamed through supercritical nitrogen, so as to protect the melt from being broken and reduce density of a final finished product; requirements of reducing weight and guaranteeing rigidity and beautiful appearance are met.

Description

[0001] technical field [0002] The invention belongs to the technical field of polymer processing, and in particular relates to an injection molding grade physically foamed polypropylene material and a preparation method thereof. [0003] Background technique [0004] Polypropylene (PP) is a crystalline polymer with regular structure, usually white pellets or powder, odorless, non-toxic, light-weight thermoplastic resin; it has easy processing, impact strength, flexibility and electrical insulation It has the advantages of good chemical resistance and good chemical resistance, and has a wide range of applications in the automotive industry, household appliances, electronics, packaging, building materials and furniture. However, PP also has some shortcomings, such as poor cold resistance, low temperature brittleness, large shrinkage, poor creep resistance, poor dimensional stability of products and easy warping deformation, etc. Therefore, polypropylene needs to be modified...

Claims

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Application Information

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IPC IPC(8): C08L23/12C08L23/06C08L51/06C08K5/13C08K5/524C08K5/526C08K5/372C08K5/37C08J9/12B29C45/77B29C45/78B29B9/06
CPCB29B9/06B29C45/77B29C45/78B29C2945/76498B29C2945/76531B29C2948/92704C08J9/122C08J2203/06C08J2323/12C08J2423/06C08L23/12C08L2201/08C08L2203/14C08L2205/025C08L2205/035C08L23/06C08L51/06
Inventor 杨桂生梁娜
Owner HEFEI GENIUS NEW MATERIALS
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