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Method for detecting film forming stability of polypropylene in bidirectional stretching by using thermal analysis method

A polypropylene, thermal analysis technology, applied in the preparation of test samples, thermal development of materials, etc., can solve problems such as affecting economic benefits, surface unevenness, film rupture, etc.

Inactive Publication Date: 2011-08-17
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the quality of the polypropylene material does not meet the specified requirements, there will be problems such as film rupture and uneven surface during production, which will affect economic benefits
[0003] Currently, the methods for characterizing the film-forming stability of polypropylene resins in the production of biaxially oriented films are very limited and have many disadvantages
The method generally adopted is only the test of xylene room temperature soluble matter, but this method is relatively rough and can only be used as a simple criterion and is not accurate; another method is to carry out trial production of polypropylene resin on a large production device, However, the cost of this method is extremely high, and a large amount of resin is required, so it is difficult to provide information for rapid characterization of resin film formation for practical applications and industrial production

Method used

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  • Method for detecting film forming stability of polypropylene in bidirectional stretching by using thermal analysis method
  • Method for detecting film forming stability of polypropylene in bidirectional stretching by using thermal analysis method
  • Method for detecting film forming stability of polypropylene in bidirectional stretching by using thermal analysis method

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Experimental program
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Effect test

Embodiment 1

[0035] Testing the film-forming stability of polypropylene in biaxial stretching by thermal analysis involves the following steps:

[0036] ①Experimental samples: five isotactic polypropylenes with different molecular structures and film-forming stability, numbered PP-1, PP-2, PP-3, PP-4, PP-5. Five polypropylene resins were tested on a large-scale film-drawing machine. The results showed that from PP-1 to PP-5, the film breaking rate of the resins gradually decreased, and the film-forming stability became better and better.

[0037] ②Use a compression molding machine to press the sample into a thin plate with uniform thickness to prepare a special test sample for thermal analysis.

[0038] ③Stay the sample at 180°C for 2 minutes, then lower the temperature to 25°C at a cooling rate of 7°C / min, stay for 1 minute, heat the sample to 180°C at a heating rate of 7°C / min, record the cooling crystallization curve and temperature rise melting curve, see Figure 1.a and Figure 1.b ...

Embodiment 2

[0057] Testing the film-forming stability of polypropylene in biaxial stretching by thermal analysis involves the following steps:

[0058] ①Experimental samples: five isotactic polypropylenes with different molecular structures and film-forming stability, numbered PP-1, PP-2, PP-3, PP-4, PP-5. Five polypropylene resins were tested on a large-scale film-drawing machine. The results showed that from PP-1 to PP-5, the film breaking rate of the resins gradually decreased, and the film-forming stability became better and better.

[0059] ②Use a compression molding machine to press the sample into a thin plate with uniform thickness to prepare a special test sample for thermal analysis.

[0060] ③Stay the sample at 210°C for 7 minutes, then lower the temperature to 50°C at a cooling rate of 12°C / min, stay for 5 minutes, heat the sample to 210°C at a heating rate of 12°C / min, record the cooling crystallization curve and temperature rise melting curve;

[0061] The crystallization ...

Embodiment 3

[0079] Testing the film-forming stability of polypropylene in biaxial stretching by thermal analysis involves the following steps:

[0080] ①Experimental samples: five isotactic polypropylenes with different molecular structures and film-forming stability, numbered PP-1, PP-2, PP-3, PP-4, PP-5. Five polypropylene resins were tested on a large-scale film-drawing machine. The results showed that from PP-1 to PP-5, the film breaking rate of the resins gradually decreased, and the film-forming stability became better and better.

[0081] ②Use a compression molding machine to press the sample into a thin plate with uniform thickness to prepare a special test sample for thermal analysis.

[0082]③Stay the sample at 210°C for 5 minutes, then lower the temperature to 40°C at a cooling rate of 9°C / min, stay for 3 minutes, heat the sample to 200°C at a heating rate of 9°C / min, record the cooling crystallization curve and temperature rise melting curve;

[0083] The crystallization tem...

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Abstract

The invention discloses a method for detecting film forming stability of polypropylene in bidirectional stretching by using a thermal analysis method. The method is characterized by comprising the following steps of: preparing polypropylene resin into a thermal analysis test standard sample; performing heating and cooling scanning on the polypropylene by using a differential scanning calorimeter (DSC), and detecting crystallization and melting behavior parameters of the polypropylene material; then designing a thermal treatment program of the polypropylene material according to the crystallization and melting behavior parameters of the material; and performing multi-step thermal treatment on the material, and analyzing the film forming stability when the polypropylene resin is processed by analyzing the results obtained by thermal grading treatment and using calculation of thickness and molecular structure parameters of a polypropylene wafer. The method timely provides film forming stability information of the polypropylene for production and application, and is simple, convenient, quick, efficient and strong in accuracy.

Description

technical field [0001] The present invention relates to the detection of film-forming stability of polypropylene in biaxial stretching by means of thermal analysis, specifically using a differential calorimetry scanner (DSC) to detect biaxially stretched polypropylene resin through step-by-step heat treatment. The invention relates to a method for film-forming stability in a production process, belonging to the field of characterization of polymer materials. Background technique [0002] In recent years, the application of biaxially oriented polypropylene film in the field of packaging has grown rapidly. With the development of production technology, the stretching rate of film is required to be faster and faster in the production process, which requires the film-forming stability of polypropylene resin to be better and better. If the quality of the polypropylene material does not meet the specified requirements, problems such as film rupture and uneven surface will occur d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/20G01N1/44
Inventor 向明亢健杨峰曹亚蔡燎原蓝方
Owner SICHUAN UNIV