Compound foaming manufacturing method for polypropylene foaming material

A manufacturing method and composite foaming technology, which is applied in the field of composite foaming manufacturing of polypropylene foam materials, can solve technical difficulties and other problems, and achieve the effects of good flame retardant and heat insulation properties and good tensile strength

Inactive Publication Date: 2012-10-03
CHONGQING HONGDAI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it requires a dedicated blowing agent metering, pressurization and injection system, which is very technically difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Mixing: 90 parts of high-melt strength polypropylene, 25 parts of silicon carbonate, 15 parts of calcium carbonate, 15 parts of sodium bicarbonate, and 5 parts of PP color masterbatch are mixed according to the weight ratio, and the model is SLD-1. In the machine, mix for 30 minutes and mix well.

[0022] (2) Mixing: Put the mixed solid material into the hopper of the SHJ-92C extruder, heat the extruder to 200°C, and then start the screw rotation of the extruder to make the high melt strength polypropylene and other materials Mixing while plasticizing for 100 minutes, chemical foaming is carried out; in the middle section of the extruder barrel, after the melt has been melted and plasticized uniformly, an inert gas foaming agent carbon dioxide is injected under the condition of 12MPa, and the injection amount of the inert gas is passed through a metering pump Measured at 5% of the melt weight, kept for 45 minutes, and then lowered to normal pressure for physical foa...

Embodiment 2

[0025] (1) Mixing: 90 parts of high-melt strength polypropylene, 25 parts of silicon carbonate, 10 parts of calcium carbonate, 20 parts of sodium bicarbonate, and 5 parts of PP color masterbatch are mixed according to the weight ratio, and the model is SLD-1. In the machine, mix for 30 minutes and mix well.

[0026] (2) Mixing: Put the mixed solid material into the hopper of the SHJ-92C extruder, heat the extruder to 200°C, and then start the screw rotation of the extruder to make the high melt strength polypropylene and other materials Mixing for 100 minutes while plasticizing, chemical foaming; in the middle section of the extruder barrel, after the melt has been melted and plasticized uniformly, an inert gas foaming agent nitrogen is injected under the condition of 12MPa, and the injection amount of the inert gas is passed through a metering pump Measured at 5% of the melt weight, kept for 45 minutes, and then lowered to normal pressure for physical foaming;

[0027] (3) R...

Embodiment 3

[0029] (1) Mixing: 85 parts of high-melt strength polypropylene, 20 parts of silicon carbonate, 10 parts of calcium carbonate, 20 parts of sodium bicarbonate, and 5 parts of PP color masterbatch are mixed according to the weight ratio, and the model is SLD-1. In the machine, mix for 30 minutes and mix well.

[0030] (2) Mixing: Put the mixed solid material into the hopper of the SHJ-92C extruder, heat the extruder to 200°C, and then start the screw rotation of the extruder to make the high melt strength polypropylene and other materials Mixing for 100 minutes while plasticizing, chemical foaming; in the middle section of the extruder barrel, after the melt has been melted and plasticized uniformly, inject the inert gas foaming agent butane under the condition of 12MPa, and the injection amount of the inert gas is measured The pump metering is 5% of the melt weight, keep it for 45min, and then reduce to normal pressure for physical foaming;

[0031] (3) Roll pressing: Extrude ...

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PUM

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Abstract

The invention provides a compound foaming manufacturing method for a polypropylene foaming material and relates to a plastic foaming technology. The compound foaming manufacturing method comprises the following steps: uniformly mixing the following raw materials by weight part: 85-95 parts of polypropylene with high melt strength, 25-35 parts of silicon carbonate, 10-20 parts of calcium carbonate, 10-20 parts of sodium bicarbonate and 1-5 parts of PP (Polypropylene) master batch, and then putting into a hopper of a plastic extruding machine; increasing the temperature to 100-280 DEG C; plasticizing while mixing for 90-150min and chemically foaming; after uniformly melting and plasticizing the melt in the middle section of a barrel of the plastic extruding machine, injecting an inert gas foaming agent under a 8-15MPa condition, wherein the injection volume of the inert gas is 1-5% of the weight of the melt; keeping for 30-60min, reducing the pressure to the normal pressure, and physically foaming; and lastly, extruding the plasticized melt out of a T-shaped head opening mould, and rolling, thereby obtaining a compound foamed polypropylene sheet. The foaming power of the compound foamed polypropylene sheet can reach 5-15 times. The compound foamed polypropylene sheet has excellent anti-flaming heat-insulating property and excellent mechanical properties, such as tensile strength, and flexural strength.

Description

technical field [0001] The invention relates to plastic foaming technology, in particular to a composite foaming manufacturing method of polypropylene foaming material. Background technique [0002] Foam plastic has the advantages of light weight, heat insulation, sound insulation, cushioning, and high specific strength. Therefore, it is widely used in the fields of packaging, industry, agriculture, transportation, military industry, aerospace industry and daily necessities. Since the 1990s, the development of foamed plastics in China has been very rapid. The main varieties are polyurethane (PU) soft and rigid foamed plastics, polystyrene (Ps) and polyolefin foamed materials. However, PU will produce harmful isocyanate residues in the foaming process and cannot be recycled; while the waste of foamed PS products does not rot and is difficult to recycle, causing "white pollution". In 1991, the European Community formulated a mandatory "Packaging rules" include foaming Ps in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/12C08J9/08C08L23/10C08K3/26B29C44/60
Inventor 赖彪夏浩籍
Owner CHONGQING HONGDAI TECH
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