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High-strength polypropylene material and preparation method thereof

A polypropylene material and polypropylene technology, applied in the field of polymer material processing, can solve the problems of difficulty in meeting the performance requirements such as transparency and safety of polypropylene materials, and achieve good industrial application prospects, high production efficiency, and significant enhancement effect. Effect

Active Publication Date: 2016-03-09
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of the second component is difficult to meet the performance requirements of polypropylene materials such as transparency and safety in food packaging and biomedical fields.

Method used

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  • High-strength polypropylene material and preparation method thereof
  • High-strength polypropylene material and preparation method thereof
  • High-strength polypropylene material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Polypropylene (1005, Formosa Plastics, Taiwan) was selected as the experimental material, and its melt index was 0.5g / 10min (210°C, 2.16Kg). Vacuum dry in an oven at 80°C for 12h.

[0037] (2) Put the dried pellets into a multi-stage stretching device consisting of an extruder (1), a confluence (2), a force assembly unit (3), and a cooling roller (4) (see figure 1 ) in the extruder. After the continuous division-deformation-stacking action of the force assembly unit, it flows out from the discharge port and is cooled by a traction cooling roller to obtain a polypropylene material with a thickness of about 1.5mm. Then the samples were annealed in a vacuum environment at 145°C for 12h.

[0038] In this embodiment, the force assembly unit adopts three 1 divided into 2 force assembly units.

[0039] like figure 1 As shown in , the discharge port of the extruder in the multi-stage stretching device is connected with the feed port of the confluence, the discharge port...

Embodiment 2

[0042] (1) Polypropylene (1005, Formosa Plastics, Taiwan) was selected as the experimental material, and its melt index was 0.5g / 10min (210°C, 2.16Kg). Vacuum dry in an oven at 80°C for 12h.

[0043] (2) Put the dried pellets into a multi-stage stretching device consisting of an extruder (1), a confluence (2), a force assembly unit (3), and a cooling roller (4) (see figure 1 ) in the extruder. After the continuous division-deformation-stacking action of the force assembly unit, it flows out from the discharge port and is cooled by a traction cooling roller to obtain a polypropylene material with a thickness of about 1.5mm. Then the samples were annealed in a vacuum environment at 145°C for 12h. Among them, the temperatures of the feeding port, conveying section, melting section, and homogenizing section of the single-screw extruder (1) are respectively 155°C, 205°C, 215°C, and 215°C; °C, 210 °C.

[0044] In this embodiment, the force assembly unit adopts seven force assemb...

Embodiment 3

[0047] (1) Polypropylene (1005, Formosa Plastics, Taiwan) was selected as the experimental material, and its melt index was 0.5g / 10min (210°C, 2.16Kg). Vacuum dry in an oven at 80°C for 12h.

[0048] (2) Put the dried pellets into a multi-stage stretching device consisting of an extruder (1), a confluence (2), a force assembly unit (3), and a cooling roller (4) (see figure 1 ) in the extruder. After the continuous division-deformation-stacking action of the force assembly unit, it flows out from the discharge port and is cooled by a traction cooling roller to obtain a polypropylene material with a thickness of about 1.5mm. Then the samples were annealed in a vacuum environment at 145°C for 12h. Among them, the temperatures of the feeding port, conveying section, melting section, and homogenizing section of the single-screw extruder (1) are respectively 155°C, 205°C, 215°C, and 215°C; °C, 210 °C.

[0049] In this embodiment, the force assembly unit adopts 7 1 divided into 8...

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Abstract

The invention discloses a preparation method of a high-strength polypropylene material. The preparation method is characterized in that in the machining process, the crystal habit of polypropylene is regulated and controlled, and therefore the mechanical performance of polypropylene is improved. In the machining process, a certain shear and two-way stretch force field is applied to polypropylene melt by regulating the number and type of force assembling units, under the action of the force field, the crystal habit of polypropylene is developed into shish-kebab structures orientated in different directions, the stretch strength of the polypropylene material can be remarkably improved, and the difference of the mechanical strength, in the extrusion direction, of the polypropylene product and the mechanical strength in the direction perpendicular to the extrusion direction, of the polypropylene product is weakened. The force assembling units are added to existing traditional extrusion equipment, operation is easy, continuous production can be achieved, control is convenient, quality is stable, production efficiency is high, and good industrial and market prospects are achieved; and the method can be widely applied to preparing high-strength polypropylene plate, sheet and film materials.

Description

technical field [0001] The invention relates to a method for preparing a high-strength polypropylene material, and belongs to the technical field of polymer material processing. Background technique [0002] Polypropylene is non-toxic, odorless and tasteless, and has a low relative density, only 0.90~0.91g / m 3 , is one of the lightest varieties of all plastics. The chemical stability of polypropylene is very good, and polypropylene is also particularly stable to water, with a water absorption rate of only 0.01% in water. Good formability. Because of the excellent comprehensive properties of polypropylene, it is widely used in large and small areas of daily life such as automobiles, construction, home furnishing, home appliances, and packaging printing industry. In the field of general plastic applications, its production capacity and consumption are second only to polyethylene. second. From 2010 to now, in just five years, my country's polypropylene production capacity h...

Claims

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Application Information

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IPC IPC(8): B29C47/00B29C47/08
CPCB29C48/00B29C48/267B29K2023/12
Inventor 吴宏王萃林郭少云夏立超王建峰
Owner SICHUAN UNIV
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