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Preparation method and application of durable hydrophilic polypropylene foamed particles

A technology of foamed particles and polypropylene, applied in chemical instruments and methods, granular microbial carrier treatment, biological water/sewage treatment, etc., can solve the problems of difficult development of polypropylene foam, and achieve industrial scale production and application , The production process is simple and the effect is easy to control

Pending Publication Date: 2021-10-29
常州福隆科技新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the research and development of polypropylene foam has become a hot spot in recent years. Although polypropylene foam products have good performance and application prospects, the development of polypropylene foam is very difficult, and there are few related and industrialized cores in China. technology, and some developed countries are vigorously developing it as a green material to replace expanded polystyrene

Method used

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  • Preparation method and application of durable hydrophilic polypropylene foamed particles
  • Preparation method and application of durable hydrophilic polypropylene foamed particles
  • Preparation method and application of durable hydrophilic polypropylene foamed particles

Examples

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preparation example Construction

[0043] The invention provides a kind of preparation method of polypropylene expanded particle, comprises the following steps:

[0044] 1) After mixing polypropylene, high-density polyethylene-octene copolymerized elastomer, hydrophilic auxiliary agent and antioxidant, a compound is obtained;

[0045] 2) Blending and extruding the mixture obtained in the above steps with the supercritical fluid, and cutting into pellets to obtain expanded polypropylene particles.

[0046] The invention firstly mixes the polypropylene, the high-density polyethylene-octene copolymerized elastomer, the hydrophilic auxiliary agent and the antioxidant to obtain the mixture.

[0047] In the present invention, the added amount of the polypropylene is preferably 50-80 parts by weight, more preferably 55-75 parts by weight, more preferably 60-70 parts by weight.

[0048] In the present invention, the melt index of the polypropylene is preferably 0.5-10 g / 10 min, more preferably 2.5-8 g / 10 min, more prefe...

Embodiment 1

[0096] Dry polypropylene RS1684 and antioxidant in a vacuum oven at 60-80 degrees Celsius for 3-6 hours, and then mix polypropylene and high-density polyethylene-octene copolymer elastomer in a mixer for 10- 15 minutes.

[0097] Extrude and foam the mixed material through a twin-screw extruder, add 3% hydrophilic additive and 1% antioxidant, control the overall temperature of the screw at 190°C-220°C, and the temperature of the extrusion die is 220°C-240°C, add a small amount of carbon dioxide foaming agent through a booster pump, the dosage is 0.001L / min-0.002L / min, and the die pressure is 2-4MPa, and the foam strip can be produced.

[0098] The foam strips are cut at a constant speed by a granulator to produce hexagonal porous foam particles with a diameter of 1.0-2.5 cm. The diameter of the macropore is 450-530μm, and the expansion ratio is 3 times.

[0099] The polypropylene foamed particles prepared in Example 1 of the present invention were characterized.

[0100] see...

Embodiment 2

[0103] Dry the polypropylene RS1684 and the antioxidant in a vacuum oven at 60-80 degrees Celsius for 3-6 hours, and then mix the polypropylene and high-density polyethylene-octene copolymer elastomer in a mixer in a ratio of 60:40 for 10- 15 minutes.

[0104] Through a twin-screw extruder, the mixed material is extruded and foamed, and 4% of hydrophilic additives and 1.5% of antioxidant are added. The overall temperature of the screw is controlled at 190°C-220°C, and the extrusion die temperature is 220°C-240°C, add a small amount of carbon dioxide foaming agent through a booster pump, the dosage is 0.001L / min-0.002L / min, and the die pressure is 2-4MPa, and the foam strip can be produced.

[0105] Cut the foam strips at a constant speed by a granulator to produce hexagonal porous foam particles with a diameter of 1.0-2.5 cm, the diameter of the macropores is 300-500 μm, and the expansion ratio is 2 times.

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Abstract

The invention provides a preparation method of polypropylene foamed particles, which comprises the following steps: firstly, mixing polypropylene, a high-density polyethylene-octylene copolymer elastomer, a hydrophilic auxiliary agent and an antioxidant to obtain a mixture; and blending and extruding the mixture obtained in the previous step and a supercritical fluid, and granulating to obtain the polypropylene foamed particles. According to the preparation process, polypropylene can be modified and foamed under the condition that the addition amount is small, the polypropylene is endowed with special properties such as hydrophilicity, durability and porous foaming properties, so that the toughness and hydrophilicity of the co-polypropylene material are remarkably improved, and the polypropylene material can be mainly applied to carriers for decomposing bacteria in sewage treatment. Meanwhile, the preparation method provided by the invention is simple in production process, easy to control and clean and environment-friendly in the whole process, the product can be completely recycled, and industrial large-scale production and application are favorably realized.

Description

technical field [0001] The invention belongs to the technical field of polypropylene foaming materials, and relates to a preparation method and application of polypropylene foaming particles, in particular to a preparation method of durable hydrophilic polypropylene foaming particles, and in terms of carrier materials for sewage treatment Applications. Background technique [0002] Foam plastic has the advantages of light weight, heat insulation, cushioning, insulation, anti-corrosion, and low price, so it is widely used in daily necessities, packaging, industry, agriculture, transportation, military industry, and aerospace industry. Since the 1990s in my country, foam The development of plastics is very rapid, and the main varieties are polyurethane (PU) soft and rigid foams, polystyrene (PS) foams and polyethylene (PE) foams. However, there are isocyanate residues harmful to the human body during the foaming process of polyurethane foam, and the foamed material cannot be r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/16C08J9/12C08L23/12C08L23/08C08K3/34C08K5/134C02F3/00
CPCC08J9/16C08J9/122C08J9/0061C08J9/0066C08J9/0023C08J9/0095C02F3/00C08J2203/06C08J2203/08C08J2323/12C08J2423/08C02F2003/001
Inventor 周光远聂赫然李巍
Owner 常州福隆科技新材料有限公司
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