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Polypropylene composition, polypropylene resin pellets, polypropylene foamed beads, preparation method thereof, and polypropylene foamed beads molded body

A technology of polypropylene composition and foamed beads, which is applied in the field of expanded polypropylene, can solve the problems of uneven foamed beads cells, not resistant to heat and oxygen aging, and low compressive strength, and achieve complete appearance, Good heat and oxygen aging resistance, high compressive strength effect

Active Publication Date: 2021-11-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide polypropylene composition, polypropylene resin granules, polypropylene foam beads, etc. Beads and preparation method thereof and polypropylene foamed bead molded body

Method used

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  • Polypropylene composition, polypropylene resin pellets, polypropylene foamed beads, preparation method thereof, and polypropylene foamed beads molded body
  • Polypropylene composition, polypropylene resin pellets, polypropylene foamed beads, preparation method thereof, and polypropylene foamed beads molded body
  • Polypropylene composition, polypropylene resin pellets, polypropylene foamed beads, preparation method thereof, and polypropylene foamed beads molded body

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specific Embodiment approach

[0051] According to a specific embodiment of the method for preparing polypropylene foam beads according to the present invention, the granulation process includes:

[0052] (a) adding the above-mentioned polypropylene composition and optional other additives into a high-speed mixer according to a certain proportion, and mixing uniformly;

[0053] (b) Extrude the above-mentioned mixture through a twin-screw extruder, and after hot cutting, introduce it into water below 75°C, preferably below 70°C, more preferably 55-65°C, for micro-particle cutting, so that the length / diameter ratio of each particle is 0.5-2.0, preferably 0.8-1.3, more preferably 0.9-1.1, and the average weight is 0.1-20 mg, preferably 0.2-10 mg, more preferably 1-3 mg. The length / diameter ratios stated here are average values ​​of 200 arbitrarily selected particles of the polypropylene composition.

[0054] According to the method for preparing polypropylene foam beads described in the present invention, the...

Embodiment 1-5

[0089] (1) Under nitrogen protection, pass 8kg of mixed C4A into a 200L reactor containing 10kg of maleic anhydride, 3kg of azobisisobutyronitrile and 100L of isoamyl acetate in a reaction kettle , the copolymerization reaction pressure is 0.7MPa, the copolymerization reaction temperature is 75°C, and the copolymerization reaction time is 5h;

[0090] Pass the copolymerization reaction product into the flash separator for gas-liquid separation at 25°C and 0MPa. The obtained liquid-solid mixture continues to be separated in the centrifuge at 4000rpm and centrifuged for 20min to obtain a solid product. Wash with hexane, filter the obtained filter cake through a sand core funnel and dry it in vacuum at 90° C. for 8 hours to obtain mixed olefin-maleic anhydride copolymer microsphere powder 101 . The microsphere powder was tested, wherein the content of the maleic anhydride structural unit was 27 mol %; the average diameter of the particles was 0.4 μm.

[0091] (2) Get mixed olefi...

Embodiment 6-9

[0093] (1) Under the protection of nitrogen, the mixed carbon four B of 6kg is passed into the reactor of 200L that fills the organic reaction solution of 12kg maleic anhydride, 3kg dibenzoyl peroxide and 100L isoamyl acetate to carry out copolymerization reaction , the copolymerization reaction pressure is 1.1MPa, the copolymerization reaction temperature is 80°C, and the copolymerization reaction time is 7h;

[0094] Pass the copolymerization reaction product into the flash separator to carry out gas-liquid separation at 30°C and 0MPa conditions, and the obtained liquid-solid mixture continues to carry out liquid-solid separation in the centrifuge at 4000rpm and centrifugation for 20min to obtain a solid product, which is then used After washing with hexane, the filter cake was vacuum-dried at 90° C. for 8 hours to obtain mixed olefin-maleic anhydride copolymer microsphere powder 102 through suction filtration through a sand core funnel. The microsphere powder was tested, wh...

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Abstract

The invention relates to the technical field of polymer materials, in particular to a polypropylene composition, a polypropylene resin pellet, a polypropylene foamed bead, a preparation method thereof and a molded body of the polypropylene foamed bead. A polypropylene composition, said composition contains 100 parts of polypropylene, 0.1-0.3 part of antioxidant, 0.25-10 parts of mixed olefin-maleic anhydride copolymerized microspheres; wherein, mixed olefin-maleic anhydride copolymerized microspheres The particle size is 0.4‑3.9μm. The polypropylene foamed beads prepared from the composition comprising mixed olefin-maleic anhydride copolymerized microspheres of the present invention have a denser and more uniform cell structure, a uniform pore size, a complete shape without rupture, and a lower density , Higher compressive strength and better thermal oxygen aging resistance. In addition, the foamed beads have a non-crosslinked structure, so they can be recycled without causing secondary pollution, and meet the requirements of circular economy.

Description

technical field [0001] The invention relates to the field of expanded polypropylene, in particular to a polypropylene composition, polypropylene resin pellets, polypropylene expanded beads, a preparation method thereof, and a polypropylene expanded bead molded body. Background technique [0002] The preparation of polypropylene foam beads by reactor batch method is a mature industrial preparation method. In order to improve the mechanical properties of foamed beads and increase the cell density and uniformity, the polypropylene kettle foaming process generally uses a physical foaming agent, which is characterized in that no chemical reaction occurs during the foaming process, and it is closely related to chemical foaming agents. Compared with the gas foaming generated by its own decomposition, the expansion ratio of the physical foaming agent is larger and easier to control, and there is no decomposition residue in the product. Commonly used physical blowing agents are chlo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/14C08L35/00C08K5/134C08K5/526C08K5/103C08J9/00
CPCC08J9/0061C08J2323/14C08J2435/00C08K5/103C08K5/1345C08K5/526C08L23/14C08L35/00
Inventor 郭鹏吕明福解娜徐耀辉张师军邵静波张琦
Owner CHINA PETROLEUM & CHEM CORP
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