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Injection molding technique of microporous foamed PP (polypropylene) plastic product

An injection molding process and a technology for plastic products, applied in the field of plastic processing, can solve the problems of difficult control of foaming efficiency and cell diameter, increase equipment investment, etc., and achieve the effects of easy control of process parameters, smooth surface, and production cost saving

Inactive Publication Date: 2013-06-05
HEFEI HUIBANG POLYMER MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, microcellular foaming injection molding at home and abroad is mainly based on the physical foaming of the injection molding machine with an external air source, that is, injecting compressed gas or supercritical liquid into the barrel of the injection molding machine outside the injection molding machine and then mixing it with molten plastic and then injecting it into the cavity. This foaming injection molding process needs to increase equipment investment, and the foaming efficiency and cell diameter are difficult to control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] An injection molding process for microporous foamed PP plastic products includes the following steps:

[0019] PP composite material preparation: the weight percentage of each component is: HMSPP 15%, copolymer PP 80%, POE 4.5%, sodium benzoate 0.5%.

[0020] Preparation of PP foaming masterbatch: the weight percentage of each component is AC foaming agent (domestic, model AI) 6%, foaming aid (ZnO / ZnSt combined system) 10%; HDPE 80%, modifier 4% .

[0021] The PP composite material and the PP foaming masterbatch are mixed evenly at a ratio of 40:1 and then added to the screw injection molding machine. The process parameters of the injection molding machine are controlled as follows:

[0022]

Shot Five

Shot four

Shot Three

Shot II

Shot one

Speed ​​(%)

40

50

70

65

95

Pressure (MPa)

0

0

0

53

125

Temperature(℃)

195

205

220

210

230

[0023] The molten and foamed composite material is then injected into a mold through a nozzle, which is a self-locking spring nozzle, ...

Embodiment 2

[0027] An injection molding process for microporous foamed PP plastic products includes the following steps:

[0028] PP composite material preparation: The weight percentage of each component in the PP composite material is: HMSPP 10%, copolymer PP 85%, POE 4%, and sodium benzoate 1%.

[0029] The PP foaming masterbatch is prepared, and the weight percentage of each component in the PP foaming masterbatch is 3% of AC foaming agent, 5% of foaming assistant, 90% of HDPE, and 2% of modifier.

[0030] The PP composite material and the PP foaming masterbatch were added to the screw injection molding machine at a weight ratio of 50:1.5. The process parameters of the injection molding machine were controlled as in Example 1.

[0031] Glue injection: the above-mentioned melted and foamed composite material is injected into a mold through a nozzle, the nozzle is a self-locking spring nozzle, and the temperature of the mold is controlled at 95°C.

[0032] After cooling and opening the mold, a mi...

Embodiment 3

[0035] An injection molding process for microporous foamed PP plastic products includes the following steps:

[0036] PP composite material preparation: The weight percentage of each component in the PP composite material is: HMSPP 10%, copolymer PP 80%, POE 9%, and sodium benzoate 1%.

[0037] The PP foaming masterbatch is prepared, and the weight percentage of each component in the PP foaming masterbatch is 3% of AC foaming agent, 9% of foaming assistant, 85% of HDPE, and 3% of modifier.

[0038] The PP composite material and the PP foaming masterbatch were added to the screw injection molding machine at a weight ratio of 40:1, and the process parameters of the injection molding machine were controlled as in Example 1.

[0039] Glue injection: the above-mentioned melted and foamed composite material is injected into a mold through a nozzle, the nozzle is a self-locking spring nozzle, and the temperature of the mold is controlled at 95°C.

[0040] After cooling and opening the mold, a ...

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Abstract

The invention discloses an injection molding technique of a microporous foamed PP (polypropylene) plastic product, which comprises the following steps: preparing a PP composite material, preparing a PP foaming master batch, feeding, melting, foaming, injecting, cooling and opening the mold. By controlling the formula, injection-molding pressure and temperature, mold temperature and other key parameters in the microporous injection molding process, the invention can lower the density of the molded PP plastic product by up to 15%, and achieves the effects of light weight and production cost saving. The microporous foamed PP has uniform pore size; and the molded PP plastic product has favorable tensile strength, bending strength and impact strength.

Description

Technical field [0001] The invention belongs to the technical field of plastic processing, and specifically relates to an injection molding process of a microporous foamed PP plastic product. Background technique [0002] Microcellular foam refers to the cell diameter of 0.11-10 microns, and the density is 10 9 ~10 15 Pcs / cm 3 Among a new type of foam. Microcellular foam has better mechanical properties than ordinary foam. Because the size of the micropores is smaller than the original defects or micro cracks in the plastic, the presence of micropores will not reduce the strength of the plastic, on the contrary, it can make the original cracks The tip is passivated to improve the mechanical properties of the plastic foam. The cell size of the microcellular foam is extremely small, and it can be made into thin-walled products, and its weight is greatly reduced. Microcellular foamed plastics have unique microporous morphology and excellent mechanical properties. Therefore, they h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/14C08L23/12C08L23/08C08L23/06C08K5/098C08J9/10C08J3/22B29C45/76
Inventor 王杰中
Owner HEFEI HUIBANG POLYMER MATERIAL CO LTD
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