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Preparation method of halogen-free flame-retardant polypropylene foam material

A flame retardant polypropylene and foam material technology, applied in the field of polypropylene material preparation, can solve the problems affecting the mechanical properties of halogen-free flame retardant polypropylene foam materials, and achieve excellent flame retardant properties and mechanical properties, intact structure, foam The effect of uniform distribution of pores

Active Publication Date: 2020-06-05
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The invention provides a preparation method of a halogen-free flame-retardant polypropylene foam material, which solves the effect of the addition of an intumescent flame retardant on the cell shape and expansion ratio of expanded polypropylene, thereby affecting the effect of the halogen-free flame-retardant polypropylene The technical problem of the mechanical properties of foam materials, the preparation of polypropylene foam materials with stable expansion ratio, intact cell structure, and excellent mechanical properties and flame retardant properties

Method used

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  • Preparation method of halogen-free flame-retardant polypropylene foam material
  • Preparation method of halogen-free flame-retardant polypropylene foam material
  • Preparation method of halogen-free flame-retardant polypropylene foam material

Examples

Experimental program
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Effect test

Embodiment 1

[0058] According to the number of parts by mass, weigh 100 parts of polypropylene, 15 parts of ammonium polyphosphate, 5 parts of pentaerythritol, 1 part of talcum powder, and 1 part of antioxidant, stir and mix at high speed in a mixer, and extrude through twin-screw at 200 ° C. Wire drawing, pelletizing in cold water to obtain particles with a particle size of 0.8-1.2 mm and a length of 1.2-1.5 mm.

[0059] Put 5kg of blend particles, 20kg of water, 100g of nanoclay, and 50g of calcium stearate into the reaction kettle, add 550g of carbon dioxide, heat to 140°C, and maintain the pressure at 2.3MPa for 30 minutes. Unload to atmospheric pressure, dry, obtain 20 times expanded polypropylene beads, its density is 0.045g / cm 3 .

[0060] figure 1 The electron microscope picture of the cross-section of the expanded polypropylene beads prepared in this example shows that the internal cells are uniform.

[0061] The foamed polypropylene beads were loaded in a 0.6MPa pressure tank ...

Embodiment 2

[0063] In parts by mass, 100 parts of polypropylene, 2 parts of zinc borate, 1 part of antioxidant, 15 parts of tricresyl phosphate, 5 parts of pentaerythritol, and 5 parts of melamine are stirred and mixed at high speed in a mixer, and added to a twin-screw extruder , under the condition of 200 ℃, through twin-screw extrusion, drawing, pelletizing in cold water, and passing through a pelletizer to obtain particles with a diameter of 0.8-1.2mm and a length of 1.2-1.5mm.

[0064] Put 5kg of blend particles, 15kg of water, 80g of montmorillonite, 40g of calcium stearate, and 0.1kg of pentane into the reaction kettle, add 400g of carbon dioxide, heat to 137°C, maintain the pressure at 2.1MPa for 30 minutes, and quickly release the pressure Valve, within 30 seconds, the material in the kettle is discharged to atmospheric pressure, and dried to obtain 15 times expanded polypropylene beads with a density of 0.06g / cm 3 .

[0065] figure 2 DSC melting curve of expanded polypropylen...

Embodiment 3

[0068] In parts by mass, 100 parts of polypropylene, 1 part of talcum powder, 1 part of antioxidant, 20 parts of melamine phosphate, and 10 parts of pentaerythritol were stirred and mixed at high speed in a mixer, and then added to a twin-screw extruder. Under the condition of ℃, it is extruded by twin-screw, drawn, pelletized by cold water, and pelletized by a pelletizer to obtain particles with a diameter of 0.8-1.2mm and a length of 1.2-1.5mm.

[0069] Put 5kg of blend particles, 25kg of water, 160g of kaolin, and 80g of sodium benzenesulfonate into the reaction kettle, add 700g of carbon dioxide, raise the temperature to 139°C, maintain the pressure at 2.5MPa for 30 minutes, pass through the rapid pressure relief valve, and within 30 seconds, the kettle The inner material is unloaded to atmospheric pressure and dried to obtain 15 times expanded polypropylene beads with a density of 0.06g / cm 3 .

[0070] The foamed polypropylene beads were pressured in a 0.5MPa pressure ta...

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Abstract

The invention discloses a preparation method of a halogen-free flame-retardant polypropylene foam material, and the method comprises the following steps: (1) weighing 100 parts by weight of polypropylene, 5-35 parts by weight of an intumescent composite flame retardant and 1-5 parts by weight of a foaming aid, uniformly mixing, and carrying out extrusion granulation to prepare expandable polypropylene particles; (2) putting the expandable polypropylene particles prepared in the step (1), water, a dispersing agent and a foaming agent into a high-pressure reaction kettle, pressurizing and heating, and pre-foaming to obtain foamed polypropylene beads; and (3) carrying out steam molding on the foamed polypropylene beads prepared in the step (2) to obtain the halogen-free flame-retardant polypropylene foam material. The preparation method provided by the invention has the advantages that the influence of the addition of the intumescent flame retardant on the foam pore form and the foaming ratio of the foamed polypropylene is solved; and the polypropylene foam material with stable foaming ratio, intact cell structure and excellent mechanical property and flame retardant property is prepared.

Description

technical field [0001] The invention relates to the field of preparation of polypropylene materials, in particular to a preparation method of a halogen-free flame-retardant polypropylene foam material. Background technique [0002] Expanded Polypropylene (EPP) molded products have good mechanical properties, sound insulation properties, environmental protection and easy degradation. In recent years, they have been widely used in the fields of automobiles, packaging, construction, sound insulation and heat insulation. It is gradually replacing foam products such as polyurethane, polystyrene, and polyethylene. [0003] Although polypropylene and its foaming materials have excellent performance and a wide range of applications, they are flammable materials because their limiting oxygen index (LOI value) is only 18, and their foaming materials, especially high-magnification foaming products (density less than 30kg / m 3 ) are more likely to be ignited, which not only limits its...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08K3/32C08K5/053C08K3/34C08K13/02C08J9/12
CPCC08J9/122C08J2323/12C08J2203/06C08K2003/323C08K5/053C08K3/346C08K13/02C08K2201/011
Inventor 蓝小琴郑文革吴飞罗海斌
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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