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Microporous polylactic acid oriented thin film

An oriented film, polylactic acid technology, applied in the field of polymer materials, can solve the problems of poor tensile mechanical properties, deepening color, poor stability of polylactic acid, etc., and achieve the effect of enhancing mechanical properties and improving product color.

Inactive Publication Date: 2016-11-23
TORAY ADVANCED MATERIALS RES LAB CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The pore diameters of the microporous films prepared by the above-mentioned technologies are different, but it is difficult to prepare microporous polylactic acid films with nanometer and submicron levels and uniform pore diameters.
[0008] In addition, polylactic acid is a polymer with poor stability
On the one hand, polylactic acid melt will undergo chemical reactions such as thermal degradation and hydrolysis, which will deteriorate the tensile mechanical properties and deepen the color.

Method used

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  • Microporous polylactic acid oriented thin film
  • Microporous polylactic acid oriented thin film
  • Microporous polylactic acid oriented thin film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5

[0094] The raw materials are extruded and granulated with a twin-screw extruder according to a certain proportion, and the extrusion temperature is 170°C. It can be extruded stably, there is no melted polylactic acid, and the extrusion granulation is colorless and transparent.

[0095] Next, an unoriented film with a thickness of 120 μm was prepared by blow molding through a single-screw extruder. The blow molding temperature is 180°C. Further, in water vapor at 90° C., the unoriented film was simultaneously biaxially stretched 3.3×3.3 times at a stretching rate of 220% / s to obtain an oriented film. The film is colorless and transparent. Table 1 lists the film composition. At 25°C, the properties of each film were measured and listed in Table 1.

Embodiment 6～9

[0099] Embodiment 6~9, comparative example 6~7

[0100] The raw materials are extruded and granulated with a twin-screw extruder according to a certain proportion, and the extrusion temperature is 170°C. Next, cast through a single-screw extruder at a casting temperature of 170° C. to prepare an unoriented film with a thickness of 110 μm. Furthermore, in water at 85° C., the unoriented film was stretched according to the stretching method listed in Table 3 to obtain an oriented film. Table 3 lists the film composition. At 25°C, the properties of each film were measured and listed in Table 3.

Embodiment 10～12

[0102] The raw materials are extruded and granulated with a twin-screw extruder according to a certain proportion, and the extrusion temperature is 170°C. Next, cast through a single-screw extruder at a casting temperature of 170° C. to prepare an unoriented film with a thickness of 130 μm. Furthermore, soak in water at 90°C for 15 minutes. Then, in the air at 95° C., the unoriented film was stretched according to the stretching method listed in Table 4 to obtain an oriented film. Table 4 lists the film composition. At 25°C, the properties of each film were measured and listed in Table 4.

[0103] Table 1

[0104]

[0105] Table 2

[0106]

[0107] table 3

[0108]

[0109] Remarks: successive bidirectional stretching in MD direction first, then TD direction stretching

[0110] Table 4

[0111]

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Abstract

The invention provides a microporous polylactic acid oriented thin film. The method comprises steps as follows: at least one melting peak with a peak temperature of 110-200 DEG C is present when the temperature is increased from 0 DEG C to 215 DEG C at a speed of 10 DEG C / min by a differential scanning calorimeter, and melting enthalpy of the melting peak meets the condition that delta Hm is larger than or equal to 0.04 J / g and smaller than or equal to 20 J / g; the temperature is kept at 215 DEG C for 3 min and then is decreased to 0 DEG C at a speed of 10 DEG C / min, the temperature is kept at 0 DEG C for 3 min, and then, when the temperature is increased at the speed of 10 DEG C / min, the melting peak with the peak temperature of 110-200 DEG C and the melting enthalpy larger than 0.04 J / g is absent. The microporous polylactic acid oriented thin film has the advantage that a processing method is simple and fast, and the thin film is biodegradable and can be applied to the fields of hygiene care, medical treatment, construction, water treatment, agriculture, electronic products, packaging, decoration and the like.

Description

technical field [0001] The invention belongs to the field of polymer materials and relates to a polylactic acid film with a microporous structure. Background technique [0002] As moisture-permeable and waterproof films, battery separators, separation membranes, tissue engineering materials, energy storage materials, etc., microporous films are widely used in various fields such as health care, medical treatment, construction, water treatment, and electronic products. The preparation methods of microporous films mainly include foaming, particle filling-stretching, solvent etching, phase separation, self-assembly, etc. The microporous films prepared by various methods have their own characteristics in structure. [0003] Polylactic acid is a kind of biodegradable polyester. Microporous films containing this polymer have been mentioned and can be applied in the fields of health care and medical treatment. [0004] CN 201310185870.6 adopts the method of particle filling-stretc...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L71/02
Inventor 桂宗彦阮晓白长田俊一
Owner TORAY ADVANCED MATERIALS RES LAB CHINA
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