PLA-PBSA blown film and preparation method thereof

Abstract

The invention provides a polylactic acid (PLA) / poly(butylene succinate-butylene adipate) (PBSA) blown film and a preparation method thereof. The blown film comprises a mixture of PLA, PBSA, plasticizer diethylene glycol monobutyl ether adipate, a lubricant, a plastic lubricant and an antioxidant. The PLA, the PBSA, the lubricant, the plastic lubricant and the antioxidant are first mechanically mixed into a premix, the premix is added through a feeding port of a twin-screw extruder, meanwhile the plasticizer diethylene glycol monobutyl ether adipate is metered and added in through a liquid feeding port of the twin-screw extruder, modified polylactic acid blown film special resin is prepared by melt-extruding, water-cooling, pelletizing and drying, the modified polylactic acid blown film special resin is blown by a film blowing machine to form a transparent tear-resistant biodegradable film. The PBSA, the plasticizers, the lubricant, the plastic lubricant and the antioxidant can effectively increase the tensile elongation at break and tear strength of polylactic acid films, maintains the transparency of the polylactic acid, and solves the brittleness defects of the polylactic acid films. The polylactic acid (PLA) / poly(butylene succinate-butylene adipate) (PBSA) blown film has good mechanical properties and excellent transparency, and can replace PE, PP, PVC and the like for preparation of films and sheets.

Description

technical field

[0001] The invention belongs to the field of polymer materials, and relates to a PLA biodegradable film and a preparation method thereof. Background technique

[0002] Unlike traditional petroleum-based plastics, PLA is polymerized from lactic acid fermented from plant starch. This is a renewable resource and has biodegradable properties, which is of great significance to protecting the environment. In the increasingly tense situation of petroleum energy, the development and research of PLA resin is particularly important. The properties of PLA itself are similar to the general-purpose plastic polypropylene, such as high modulus, high tensile strength and good processability. However, the brittleness of PLA is serious, and the impact strength is less than 5 KJ / m 2 , seriously restricting its wide application.

[0003] PLA also has good processing performance and transparency, and can be applied to traditional extrusion, injection molding, blow molding and ...

Examples

Embodiment 1

[0027] Embodiment 1: the present invention provides a kind of PLA biodegradable film, and the composition of its formula and the proportioning of mass parts are:

[0028] PLA 80 copies;

[0029] 10 copies of PBSA;

[0030] 9 parts of plasticizer diethylene glycol monobutyl adipate;

[0031] 0.4 part of lubricant ethylene bis stearic acid amide;

[0032] Opening agent erucamide 0.4 parts;

[0033] Antioxidant 168 and 1010 blend 0.2 part by mass ratio 1:1.

[0034] Weigh PLA, PBSA, ethylene bisstearamide, erucamide, 168 and 1010 according to the above formula, mechanically blend each component for 5 minutes, add the mixed raw materials into a twin-screw extruder, and extrude Add the above-mentioned diethylene glycol monobutyl ether adipate quantitatively with a peristaltic pump to the side line of the extruder during the extrusion process. The conditions for extrusion and granulation are: the set temperature of the twin-screw extruder is: Zone 1: 140 o C, District 2: 165 o...

Embodiment 2

[0035] Embodiment 2: each component is taken by following formula and quality:

[0036] 70 copies of PLA;

[0037] 20 copies of PBSA;

[0038] 9 parts of plasticizer diethylene glycol monobutyl adipate;

[0039] 0.4 part of lubricant ethylene bis stearic acid amide;

[0040] Opening agent erucamide 0.5 parts;

[0041] Antioxidant 168 and 1010 blend 0.1 part by mass ratio 1:1.

[0042] This step of extrusion granulation and film blowing process is the same as that of Example 1, the thickness of the film is controlled at 0.04mm, and the mechanical properties and light transmittance of the film are tested. The test results are listed in Table 1.

Embodiment 3

[0043] Embodiment 3: each component is taken by following formula and quality:

[0044] 60 copies of PLA;

[0045] 30 copies of PBSA;

[0046] 9 parts of plasticizer diethylene glycol monobutyl adipate;

[0047] 0.4 part of lubricant ethylene bis stearic acid amide;

[0048] Opening agent erucamide 0.5 part;

[0049] Antioxidant 168 and 1010 blend 0.1 part by mass ratio 1:1.

[0050] This step of extrusion granulation and film blowing process is the same as that of Example 1, the thickness of the film is controlled at 0.04mm, and the mechanical properties and light transmittance of the film are tested. The test results are listed in Table 1.

technical field

[0001] The invention belongs to the field of polymer materials, and relates to a PLA biodegradable film and a preparation method thereof. Background technique

[0002] Unlike traditional petroleum-based plastics, PLA is polymerized from lactic acid fermented from plant starch. This is a renewable resource and has biodegradable properties, which is of great significance to protecting the environment. In the increasingly tense situation of petroleum energy, the development and research of PLA resin is particularly important. The properties of PLA itself are similar to the general-purpose plastic polypropylene, such as high modulus, high tensile strength and good processability. However, the brittleness of PLA is serious, and the impact strength is less than 5 KJ / m 2 , seriously restricting its wide application.

[0003] PLA also has good processing performance and transparency, and can be applied to traditional extrusion, injection molding, blow molding and ...

Examples

Embodiment 1

[0027] Embodiment 1: the present invention provides a kind of PLA biodegradable film, and the composition of its formula and the proportioning of mass parts are:

[0028] PLA 80 copies;

[0029] 10 copies of PBSA;

[0030] 9 parts of plasticizer diethylene glycol monobutyl adipate;

[0031] 0.4 part of lubricant ethylene bis stearic acid amide;

[0032] Opening agent erucamide 0.4 parts;

[0033] Antioxidant 168 and 1010 blend 0.2 part by mass ratio 1:1.

[0034] Weigh PLA, PBSA, ethylene bisstearamide, erucamide, 168 and 1010 according to the above formula, mechanically blend each component for 5 minutes, add the mixed raw materials into a twin-screw extruder, and extrude Add the above-mentioned diethylene glycol monobutyl ether adipate quantitatively with a peristaltic pump to the side line of the extruder during the extrusion process. The conditions for extrusion and granulation are: the set temperature of the twin-screw extruder is: Zone 1: 140 o C, District 2: 165 o...

Embodiment 2

[0035] Embodiment 2: each component is taken by following formula and quality:

[0036] 70 copies of PLA;

[0037] 20 copies of PBSA;

[0038] 9 parts of plasticizer diethylene glycol monobutyl adipate;

[0039] 0.4 part of lubricant ethylene bis stearic acid amide;

[0040] Opening agent erucamide 0.5 parts;

[0041] Antioxidant 168 and 1010 blend 0.1 part by mass ratio 1:1.

[0042] This step of extrusion granulation and film blowing process is the same as that of Example 1, the thickness of the film is controlled at 0.04mm, and the mechanical properties and light transmittance of the film are tested. The test results are listed in Table 1.

Embodiment 3

[0043] Embodiment 3: each component is taken by following formula and quality:

[0044] 60 copies of PLA;

[0045] 30 copies of PBSA;

[0046] 9 parts of plasticizer diethylene glycol monobutyl adipate;

[0047] 0.4 part of lubricant ethylene bis stearic acid amide;

[0048] Opening agent erucamide 0.5 part;

[0049] Antioxidant 168 and 1010 blend 0.1 part by mass ratio 1:1.

[0050] This step of extrusion granulation and film blowing process is the same as that of Example 1, the thickness of the film is controlled at 0.04mm, and the mechanical properties and light transmittance of the film are tested. The test results are listed in Table 1.

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