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A method of foaming polypropylene plastics from low-temperature heat-expandable microspheres

A technology for foaming polypropylene and expanding microspheres is applied in the field of low temperature thermally expanding microsphere foaming polypropylene plastics, which can solve the problems of bubble merger, gas escape, bubble wall rupture, etc., so as to reduce the bubble wall rupture, improve production efficiency, low cost effect

Inactive Publication Date: 2019-05-10
南京欣阳新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The invention discloses a method for foaming polypropylene plastics from low-temperature heat-expandable microspheres, which can solve the occurrence probability of phenomena such as cell wall rupture, gas escape, cell collapse, and bubble merging during high-temperature molten state foaming.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A method for foaming polypropylene plastics by low-temperature thermal expansion microspheres, the specific process of preparing foamed polypropylene is as follows:

[0033]With 0.8kg of bis(2-ethylhexyl) phthalate as plasticizer, 1.5kg of coal tar pitch as liquid softener, and 2kg of low-temperature thermally expandable microspheres with an initial foaming temperature not exceeding 120°C (polyethylene Methyl methacrylate as the shell and sodium bicarbonate as the core), added to 10kg of polypropylene powder with a particle size of 20-40μm, added to a high-shear emulsifier, adjusted the rotor speed to 2500r / min, and turned on the drive The motor makes the material evenly mixed to make a viscous system. At the same time, under the action of strong shearing and stirring, air is involved in the system to form a preliminary foam; the resulting preliminary foam is placed in a mold, heated by high-temperature saturated steam at 130°C, and the steam is controlled. The pressur...

Embodiment 2

[0036] A method for foaming polypropylene plastics by low-temperature thermal expansion microspheres, the specific process of preparing foamed polypropylene is as follows:

[0037] Use 1kg of dioctyl phthalate as plasticizer, 1kg of pine tar as liquid softener, and 2.5kg of low-temperature thermally expandable microspheres with initial foaming temperature not exceeding 120°C (polymethyl methacrylate as shell, sodium bicarbonate as the core), add to 10kg polypropylene powder with a particle size of 20~40μm, add it to a high-shear emulsifier, adjust the rotor speed to 2200r / min, turn on the drive motor, and mix the materials evenly , made into a viscous system. At the same time, under the action of strong shearing and stirring, air is involved in the system to form a preliminary foam; the resulting preliminary foam is placed in a mold, heated by high-temperature saturated steam at 140°C, and the steam is controlled. The pressure is 0.3MPa, the expansion microsphere inside is he...

Embodiment 3

[0040] A method for foaming polypropylene plastics by low-temperature thermal expansion microspheres, the specific process of preparing foamed polypropylene is as follows:

[0041] Use 0.9kg of bis(2-ethylhexyl) phthalate as plasticizer, 1.2kg of coal tar as liquid softener, and 2.2kg of low-temperature thermally expandable microspheres with an initial foaming temperature not exceeding 120°C (with Polymethyl methacrylate as the shell and sodium bicarbonate as the core), add it to 10Xkg polypropylene powder with a particle size of 20-40 μm, add it to a high-shear emulsifier, adjust the rotor speed to 2000r / min, and turn on Drive the motor to make the materials mix evenly and make a viscous system. At the same time, under the action of strong shearing and stirring, air is involved in the system to form a preliminary foam; the resulting preliminary foam is placed in a mold, heated by high-temperature saturated steam at 150°C, and the steam is controlled. The pressure is 0.27MPa,...

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Abstract

The invention belongs to the technical field of preparation of polypropylene foam, and provides a method for foaming polypropylene plastic through low-temperature thermal expansion microspheres. The method comprises the steps that a plasticizer and a liquid state softening agent are used for lowering the softening point of polypropylene, so that the polypropylene and the low temperature thermal expansion microspheres are mixed, high-speed shearing is conducted on the polypropylene and the low temperature thermal expansion microspheres, air is introduced, and initial foam bodies are formed; andthen the thermal expansion microspheres are expanded by heating through saturated steam at a low temperature to produce foaming gas, and the polypropylene foam is prepared. According to the method for foaming the polypropylene plastic through the low-temperature thermal expansion microspheres, compared with the traditional method, cracking of foam walls, gas escaping, foam hole collapse and bubble merging in the foaming process of the polypropylene are reduced, and steam heating energy consumption is small, the recyclable effect is achieved, and environmental protection benefits are good.

Description

technical field [0001] The invention belongs to the technical field of polypropylene foam preparation and provides a method for foaming polypropylene plastics from low-temperature heat-expandable microspheres. Background technique [0002] Polypropylene (PP, the abbreviation of the initial letter of Poly Propylene in English) is a synthetic resin mass-produced in the 1950s. It is a homopolymer of propylene or propylene α-olefin (ethylene, butene-1, hexylene ene-1) copolymer, its molecule has a linear structure, and its density is 0.89-0.91g / cm3, which is lower than that of low-density polyethylene. Because PP has high relative hardness, small specific gravity, high tensile strength, good transparency, good stress crack resistance and chemical resistance, high heat deflection temperature, and excellent injection molding performance, it can be stretched and oriented at will, It can be blended and modified with other materials, so the application range of PP continues to expan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C44/34B29C44/04B29C44/60B29C35/04
CPCB29C44/04B29C44/3426B29C44/60
Inventor 陈庆昝航
Owner 南京欣阳新能源科技有限公司
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