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Improved microporous polymer film and preparation method thereof

A microporous polymer, an improved technology, applied in the field of applied chemical industry, can solve the problems of unreported thermal stability of β crystal, unreported thermal stability, difficult metal drum peeling, etc., to achieve good film forming stability and Pore-forming performance, improved porosity, and excellent productivity

Inactive Publication Date: 2012-07-25
CHENGDU WISEDONE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the line speed when making a microporous film is determined by the crystal solidification state of molten polypropylene in the casting process, and it is difficult to further improve productivity
In addition, high-speed casting for high-speed film formation also has the problem of sticking in the uncured state, making it difficult to peel off from the metal drum.
[0016] However, in the existing patents (such as CN1062357, CN1296195C, CN101880419, CN101245150) for preparing microporous polypropylene films by the β crystal method, almost all the researches are based on certain β The polypropylene base film with low crystal content starts, but there is no report on the formation of β crystals in the base film, especially the thermal stability
For the only patent CN101070407 that reports the formation of β crystals in the base film, there is no report on the thermal stability of the β crystals

Method used

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  • Improved microporous polymer film and preparation method thereof
  • Improved microporous polymer film and preparation method thereof
  • Improved microporous polymer film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] According to the extrusion method, the molten polymer mixture (the specific composition is described in detail below) at 210 o After extrusion at the extrusion temperature of C, at a melt stretching rate of 50 m / min, the stretching is carried out by a pull-out roller to 50 times respectively, and solidified to obtain a polypropylene base film. at 120 o C crystallization, the crystallization time is 0.1min, and the recorded polypropylene base film β crystal content K is 0.89, and on the DSC melting curve of the obtained polypropylene base film, the melting initiation temperature of the β crystal melting peak (T onset ) for 147 o C, the termination melting temperature (T endset ) for 156 o c. Next the two polypropylene base films were stretch oriented in machine and transverse directions and finally set.

[0032] The polypropylene film has the following composition:

[0033] 84.95wt% high isotactic polypropylene homopolymer (PP), its 13 The C-NMR isotacticity...

Embodiment 2

[0046] According to the extrusion method, the molten polymer mixture (the specific composition is described in detail below) at 210 o After extrusion at the extrusion temperature of C, at a melt stretching rate of 2m / min, the stretching is drawn to 2 times through the take-off roller, and solidified to obtain a polypropylene base film. at 120 o C crystallization, crystallization time 3min. The beta crystal content K of the polypropylene base film was measured to be 0.94. On the DSC melting curve of the prepared polypropylene-based film, the melting onset temperature of the β crystal melting peak (T onset ) for 147 o C, the termination melting temperature (T endset ) for 158 o c. Next, the polypropylene base film was stretch-oriented in the longitudinal and transverse directions, and finally set.

[0047] The polypropylene film has the following composition:

[0048] 84.95wt% high isotactic polypropylene homopolymer (PP), its 13 The C-NMR isotacticity is 98% and ...

Embodiment 3

[0061] According to the extrusion method, the molten polymer mixture (the specific composition is described in detail below) at 210 o After extrusion at the extrusion temperature of C, at a melt stretching rate of 2m / min, the stretching is drawn to 2 times through the take-off roller, and solidified to obtain a polypropylene base film. at 130 o C crystallization, crystallization time 5min. The beta crystal content K of the polypropylene base film was measured to be 0.91. On the DSC melting curve of the prepared polypropylene-based film, the melting onset temperature of the β crystal melting peak (T onset ) for 145 o C, the termination melting temperature (T endset ) for 156 o c. Next, the polypropylene base film was stretch-oriented in the longitudinal and transverse directions, and finally set.

[0062] The polypropylene film has the following composition:

[0063] 84.95wt% high isotactic polypropylene homopolymer (PP), its 13 The C-NMR isotacticity is 98% and ...

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Abstract

The invention relates to an improved microporous polymer film and a preparation method thereof, and belongs to the field of chemistry. The improved microporous polymer film comprises the following compositions by weight percentage: 55% to 99.79% of polypropylene homopolymer, 0.01% to 5% of beta crystal nucleating agent, 0.1% to 20% of polymeric additive and 0.1% to 20% of inorganic modifier. The improved microporous polymer film is prepared by stretching a melt about 2 to 60 times at a speed of 1 m to 100 m / min in casting, calendering, extruding or film blowing process. Compared with the prior art, more beta crystals can be obtained within shorter time, the formed beta crystals have higher thermal stability, and have better film-forming stability and pore-forming properties, and the prepared microporous film has the characteristics of easiness in processing, higher permeability, excellent productivity, and strong mechanical properties and dimensional stability, and the porosity is further improved, and thereby the permeability of various media can be obviously improved.

Description

technical field [0001] The invention relates to an improved microporous polymer film and a preparation method thereof, belonging to the field of applied chemical industry. Background technique [0002] Microporous films have the characteristics of permeability and low specific gravity, so they are mainly used for base films such as gas separation membranes and reverse osmosis membranes; medical functional materials such as sterile packaging and sterile tents; batteries, electrolytic capacitors, etc. Diaphragms; various separation membranes (filters); representative items such as diapers and sanitary products; moisture-permeable and waterproof materials for clothing and medical care; materials for heat-sensitive receiver paper, ink receiver materials, etc., are widely used. [0003] Polyolefin has the advantages of low cost and stable physical and chemical properties. Since its industrialization in the last century, it has quickly become the most widely used thermoplastic pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L23/06C08L33/20C08L25/12C08L27/18C08L25/06C08L67/02C08K5/098C08K3/36C08K3/22C08K5/20C08K3/26C08K3/30
Inventor 惠志峰
Owner CHENGDU WISEDONE TECH
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