Foaming method of polypropylene foamed microparticles

A technology of polypropylene and microparticles, which is applied in the field of polypropylene foam materials, can solve problems such as poor mechanical properties, low production process efficiency, and low expansion ratio of polypropylene foam particles, and achieve excellent compression resistance and energy absorption performance, mechanical properties Excellent performance and the effect of avoiding pollution of volatile organic compounds

Inactive Publication Date: 2019-06-28
济南泰德包装科技有限公司
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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 a foaming method of polypropylene foamed particles, to solve the problem of low efficiency of the preparation process of existing polypropylene foamed particles, low expansion ratio of the prepared polypropylene foamed particles, and poor mechanical properties Defects

Method used

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  • Foaming method of polypropylene foamed microparticles

Examples

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Comparison scheme
Effect test

Embodiment 1

[0037] The foaming method of the polypropylene expanded particle of the present embodiment comprises the following steps:

[0038] (1) Mix the polypropylene raw material granules and the first additive evenly, heat it with electricity to make it melt from solid to liquid in the extruder, extrude through the small hole in the mold after melting, and compress to a cross-sectional diameter of about 0.7mm The compressed filaments become solid filaments after being cooled by the water tank. The filaments are cut into granules, and the granules are screened by a vibrating screen to obtain evenly sized polypropylene particles for foaming. This process Generally, it is controlled at about 240°C; the melt index of polypropylene raw material particles is 3.37g / 10min, the first additive is talcum powder, and the weight of talc powder is 3% of the weight of polypropylene raw material particles.

[0039] (2) Add polypropylene particles, the second auxiliary agent, and water into the autocl...

Embodiment 2

[0047] The foaming method of the polypropylene expanded particle of the present embodiment comprises the following steps:

[0048] (1) Mix the polypropylene raw material particles and the first additive evenly, heat it with electricity to make it melt from solid to liquid in the extruder, extrude through the small hole in the mold after melting, and compress to a cross-sectional diameter of about 0.8mm The compressed filaments become solid filaments after being cooled by the water tank. The filaments are cut into granules, and the granules are screened by a vibrating screen to obtain evenly sized polypropylene particles for foaming. This process It is generally controlled at about 240°C; the melt index of polypropylene raw material particles is 3.6g / 10min, the first additive is talcum powder, and the weight of talc powder is 5% of the weight of polypropylene raw material particles.

[0049] (2) Add polypropylene particles, the second auxiliary agent, and water into the autocla...

Embodiment 3

[0057] The foaming method of the polypropylene expanded particle of the present embodiment comprises the following steps:

[0058] (1) Mix the polypropylene raw material granules and the first additive evenly, heat it with electricity to make it melt from solid to liquid in the extruder, extrude through the small hole in the mold after melting, and compress into a cross-sectional diameter of about 1mm Filamentous, the compressed filaments become solid filaments after being cooled in a water tank, the filaments are cut into granules, and the granules are screened out by a vibrating screen to obtain evenly sized polypropylene particles for foaming. This process is generally The temperature is controlled at about 240°C; the melt index of the polypropylene raw material granules is 3.8g / 10min, the first additive is talcum powder, and the weight of the talc powder is 8% of the weight of the polypropylene raw material granules.

[0059] (2) Add polypropylene particles, the second aux...

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Abstract

The invention discloses a foaming method of polypropylene foamed microparticles. The foaming method comprises the following steps: uniformly mixing polypropylene raw material particles with a first auxiliary agent, and extruding and granulating the mixture to obtain the polypropylene microparticles for foaming; adding the microparticles, a second auxiliary agent and water into a high pressure kettle to be stirred, heating the kettle by steam, injecting high pressure carbon dioxide into the polypropylene microparticles which are softened but not melted; keeping the temperature and the pressurefor a certain time to make sure that high pressure carbon dioxide fully impregnates the polypropylene microparticles, wherein the polypropylene microparticles are foamed; and after foaming, relievingthe pressure quickly to discharge to obtain the polypropylene foamed microparticles. The foaming method of the polypropylene foamed microparticles achieves continuous production and operation, and ishigh in efficiency, simple in process and suitable for industrial popularization and application. The foaming rate of the polypropylene foamed microparticles prepared by the invention is adjustable, the pores are uniform and fine, and the polypropylene foamed microparticles are excellent in mechanical property and has good compressive strength, tensile strength and buffer performance.

Description

technical field [0001] The invention relates to the technical field of polypropylene foam materials, in particular to a method for foaming polypropylene foam particles. Background technique [0002] Foam plastic has the advantages of light weight, heat insulation, sound insulation, cushioning, high specific strength, and low price. Therefore, it is widely used in packaging, industry, agriculture, construction, transportation, military industry, aerospace industry and daily necessities. . There are harmful residues in the foaming process of polyurethane foam. At the same time, foamed polyurethane cannot be recycled repeatedly; because foamed polystyrene will cause serious pollution to the environment, foaming has been banned worldwide The production and use of polystyrene, and polypropylene foam material has extremely rich sources of raw materials and good thermal stability (the highest use temperature can reach 120 ° C, while the highest use temperature of expanded polystyr...

Claims

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Application Information

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IPC IPC(8): C08J9/12C08L23/12C08L33/04C08K3/34C08K3/32
Inventor 陈建文
Owner 济南泰德包装科技有限公司
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