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Biaxially oriented foamed polypropylene film and preparation method thereof

A technology of foamed polypropylene and biaxial stretching, which is applied in the field of biaxially stretched foamed polypropylene film and its preparation, which can solve complex process, low production efficiency, inability to adjust film width, thickness, cell structure, etc. question

Active Publication Date: 2019-09-20
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the film prepared by it is formed by casting, and the width, thickness, and cell structure of the film cannot be adjusted by adjusting the traction rate.
[0005] For example, patent CN201610315620.3 reports a biaxially stretched non-woven porous fiber membrane. By performing multiple times of hot rolling and multiple times of biaxially stretching polypropylene melt-blown or spunbonded non-woven fiber webs, the prepared polypropylene has no The spun porous fiber membrane has the advantages of controllable pore size, porosity and thickness. Although this process can control the pore structure, the process is complicated and the production efficiency is low. The fiber membrane produced has an open-pore structure.

Method used

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  • Biaxially oriented foamed polypropylene film and preparation method thereof
  • Biaxially oriented foamed polypropylene film and preparation method thereof
  • Biaxially oriented foamed polypropylene film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] The main screw speed of the extruder is 200r / min, and the feeding speed is 90g / min. 78 parts of high melt strength PP resin (melt strength 36 ~ 38cN), 10 parts of wide molecular weight distribution PP resin (molecular weight distribution of 8.4 ~ 9.2), 0.2 parts of silica, 0.5 parts of polytetrafluoroethylene, 22 parts Intumescent flame retardant, 0.3 parts of 3114 antioxidant, fully mixed in a high-speed mixer, and then added from the main feed port of the twin-screw extruder, and the supercritical fluid is 1 / 3 from the main feed port The side line feed port at the place is added in the extruder, the supercritical carbon dioxide addition is 2.5 parts, and ethanol is selected as the carrier agent, and the addition is 0.52 parts, and the internal diameter (die diameter) is 10 mm, and the die gap is 0.9 mm Extruded with a circular head to obtain a micro-foamed melt film.

[0068] The barrel temperature during extrusion is 180°C, the head temperature is 158°C, and the hea...

Embodiment 2

[0071] The rotating speed of the main screw of the extruder is 220r / min, and the feeding speed is 86g / min. 82 parts of high melt strength PP resin (melt strength 30 ~ 32cN), 9 parts of wide molecular weight distribution PP resin (molecular weight distribution of 10.1 ~ 11.4), 0.3 parts of silica, 0.1 parts of polytetrafluoroethylene, 10 parts Intumescent flame retardant, 0.6 parts of 3114 antioxidant, fully mixed in a high-speed mixer, and then added from the main feed port of the twin-screw extruder, and the supercritical fluid is 1 / 3 from the main feed port The side line feed port at the place is added in the extruder, the addition amount of supercritical carbon dioxide is 3.8 parts, and ethanol is selected as the carrier agent, and the addition amount is 0.4 parts, and the inner diameter is 10 mm, and the die gap is 0.9 mm. A microfoamed melt film was obtained.

[0072] The barrel temperature during extrusion is 180°C, the head temperature is 156°C, and the head pressure i...

Embodiment 3

[0075] The screw diameter of the extruder is 20 mm, and the aspect ratio is 48. The main screw speed of the extruder is 180r / min, and the feeding speed is 82g / min. Mix 80 parts of high melt strength PP resin (melt strength 33~35cN), 5 parts of wide molecular weight distribution PP resin (molecular weight distribution of 8.4~9.2), 0.2 parts of silica, 0.3 parts of polytetrafluoroethylene, 13.5 parts Intumescent flame retardant, 1.0 parts of 3114 and DSTP (3114: DSTP (weight ratio) is 7: 1), fully mixed in a high-speed mixer, and then added from the main feed port of the twin-screw extruder, while the super The critical fluid is fed into the extruder from the side line feed port 1 / 3 away from the main feed port. 10mm, the die gap is 0.9mm ring die extrusion, to obtain a micro-foamed melt film.

[0076] The barrel temperature during extrusion is 180°C, the head temperature is 160°C, and the head pressure is 15Mpa. Adjust the blower valve to blow enough air into the middle of t...

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Abstract

The invention discloses a biaxially oriented foamed polypropylene film, which is composed of following raw materials in parts by weight: 70 to 85 parts of PP resin with high melt strength; 0.5 to 15 parts of resin with wide molecular weight distribution; 0.1 to 2 parts of a nucleating agent; 0.1 to 0.3 part of a melt drip resisting agent; 0 to 30 parts of a flame retardant; and 0.1 to 1.0 part of an antioxidant. The invention also discloses a preparation method of the biaxially oriented foamed polypropylene film. A supercritical extrusion foaming technology is utilized to extrude a polypropylene micro-foamed melt film in an annular shape; then a dual-axis stretching mode is adopted to apply an external force during the growth process of cells; the cells can obtain controllable stretches of different degrees in different dimensions, and thus foamed membrane materials with different cell structures can be prepared.

Description

technical field [0001] The invention belongs to the field of polymer modification and processing, and in particular relates to a biaxially stretched foamed polypropylene film and a preparation method thereof. Background technique [0002] Biaxially oriented polypropylene film has the advantages of light weight, non-toxic, odorless, moisture-proof, high mechanical strength, good dimensional stability, good printing performance, and good transparency. It has the advantages of high transparency, good gloss, good barrier property, high impact strength and low temperature resistance. Its disadvantage is that it is easy to shrink the film during heat sealing (except for the heat shrinkable cigarette film using its heat shrinkability). It has excellent comprehensive performance. [0003] In the prior art, there are many patents (patent numbers CN201110077909.3, CN201272072) related to biaxial stretching to prepare polypropylene films with different properties, all of which are pr...

Claims

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Application Information

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IPC IPC(8): C08L23/12C08L27/18C08K3/36C08J9/12C08J5/18
CPCC08J5/18C08J9/0061C08J9/0066C08J9/122C08J2323/12C08J2423/12C08J2427/18
Inventor 曹堃姜自印姚臻龚昌景刘少帅
Owner ZHEJIANG UNIV
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