Biodegradable heat shrink film and processing technology thereof

Abstract

The invention discloses a biodegradable heat shrink film and a processing technology thereof, and relates to the technical field of heat shrink films. The biodegradable heat shrink film is prepared from the following raw materials by weight: 100 parts of modified polylactic acid, 0.5-5 parts of an anti-static agent, 0.5-5 parts of a lubricant, 0.5-5 parts of an antioxidant, and 0.5-5 parts of a light stabilizer. The polylactic acid is used as a processing raw material of the heat shrink film, and the green and environment-friendly heat shrink film is prepared by using the excellent biodegradability of the polylactic acid, so that the problem of environmental pollution caused by discarding of a conventional heat shrink film is relieved.

Description

Technical field:

[0001] The invention relates to the technical field of heat-shrinkable films, in particular to a biodegradable heat-shrinkable film and a processing technology thereof. Background technique:

[0002] Heat shrinkable film is used for sales and transportation of various products, and its main function is to stabilize, cover and protect products. The heat shrinkable film has good puncture resistance and shrinkage stress, and the film cannot produce holes during the shrinking process. As a packaging material, heat shrinkable film has the characteristics of good transparency, strong protection, and good cleaning performance, and is suitable for the packaging of electronic components.

[0003] Heat shrinkable films are mostly made of traditional plastics, such as polyethylene (PE), polypropylene (PP), polyester (PET), polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), etc. These plastics do not have Biodegradable, and it is easy to cause irreversible dama...

Examples

Embodiment 1

[0028] 1. Preparation of modified polylactic acid:

[0029] Mix 85 parts of polylactic acid, 15 parts of allyl (diisopropylamino) dimethylsilane and 1 part of azobisisobutyronitrile evenly, then transfer to a twin-screw extruder for reaction, and the screw speed is 150rpm , the reaction temperature is 180°C, and the product is cooled, pelletized and dried to obtain modified polylactic acid.

[0030] 2. Processing of heat shrinkable film:

[0031] (1) Mix 100 parts of modified polylactic acid, 1 part of fatty alcohol polyoxyethylene ether AEO-9, 2 parts of zinc stearate, 1 part of antioxidant 1010, and 0.5 part of light stabilizer 622, and dry to contain The amount of water is less than 100ppm.

[0032] (2) Transfer the mixed material obtained in step (1) to a twin-screw extruder, melt extrude, and the melt extrusion temperature is 180°C, the die is cast, the cast sheet is wound, biaxially stretched, and the biaxially stretched temperature is 100°C, cooling and setting, and ...

Embodiment 2

[0034] 1. Preparation of modified polylactic acid:

[0035] 90 parts of polylactic acid, 10 parts of allyl (diisopropylamino) dimethyl silane and 1 part of benzoyl peroxide are mixed homogeneously, then transferred to a twin-screw extruder for reaction, the screw speed is 100rpm, The reaction temperature is 170°C, and the product is cooled, pelletized and dried to obtain modified polylactic acid.

[0036] 2. Processing of heat shrinkable film:

[0037] (1) Mix 100 parts of modified polylactic acid, 1 part of fatty alcohol polyoxyethylene ether AEO-9, 1 part of ethylene bisstearamide, 1 part of antioxidant 1076, 0.5 part of light stabilizer 944, and dry To the water content below 100ppm.

[0038] (2) Transfer the mixed material obtained in step (1) to a twin-screw extruder, melt extrude, and the melt extrusion temperature is 190°C, the die is cast, the cast sheet is wound, biaxially stretched, and the biaxially stretched temperature is 110°C, cooling and setting, and winding...

Embodiment 3

[0040] 1. Preparation of modified polylactic acid:

[0041] 95 parts of polylactic acid, 5 parts of allyl (diisopropylamino) dimethylsilane and 0.5 part of azobisisoheptanonitrile are mixed uniformly, and then transferred to a twin-screw extruder for reaction, and the screw speed is 150rpm , the reaction temperature is 190°C, and the product is cooled, pelletized, and dried to obtain modified polylactic acid.

[0042] 2. Processing of heat shrinkable film:

[0043] (1) Mix 100 parts of modified polylactic acid, 1 part of fatty alcohol polyoxyethylene ether AEO-9, 2 parts of calcium stearate, 0.5 part of antioxidant 1010, and 0.5 part of light stabilizer 944, and dry to contain The amount of water is less than 100ppm.

[0044] (2) Transfer the mixed material obtained in step (1) to a twin-screw extruder, melt extrude, and the melt extrusion temperature is 180°C, the die is cast, the cast sheet is wound, biaxially stretched, and the biaxially stretched temperature is 100°C, c...

Technical field:

[0001] The invention relates to the technical field of heat-shrinkable films, in particular to a biodegradable heat-shrinkable film and a processing technology thereof. Background technique:

[0002] Heat shrinkable film is used for sales and transportation of various products, and its main function is to stabilize, cover and protect products. The heat shrinkable film has good puncture resistance and shrinkage stress, and the film cannot produce holes during the shrinking process. As a packaging material, heat shrinkable film has the characteristics of good transparency, strong protection, and good cleaning performance, and is suitable for the packaging of electronic components.

[0003] Heat shrinkable films are mostly made of traditional plastics, such as polyethylene (PE), polypropylene (PP), polyester (PET), polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), etc. These plastics do not have Biodegradable, and it is easy to cause irreversible dama...

Examples

Embodiment 1

[0028] 1. Preparation of modified polylactic acid:

[0029] Mix 85 parts of polylactic acid, 15 parts of allyl (diisopropylamino) dimethylsilane and 1 part of azobisisobutyronitrile evenly, then transfer to a twin-screw extruder for reaction, and the screw speed is 150rpm , the reaction temperature is 180°C, and the product is cooled, pelletized and dried to obtain modified polylactic acid.

[0030] 2. Processing of heat shrinkable film:

[0031] (1) Mix 100 parts of modified polylactic acid, 1 part of fatty alcohol polyoxyethylene ether AEO-9, 2 parts of zinc stearate, 1 part of antioxidant 1010, and 0.5 part of light stabilizer 622, and dry to contain The amount of water is less than 100ppm.

[0032] (2) Transfer the mixed material obtained in step (1) to a twin-screw extruder, melt extrude, and the melt extrusion temperature is 180°C, the die is cast, the cast sheet is wound, biaxially stretched, and the biaxially stretched temperature is 100°C, cooling and setting, and ...

Embodiment 2

[0034] 1. Preparation of modified polylactic acid:

[0035] 90 parts of polylactic acid, 10 parts of allyl (diisopropylamino) dimethyl silane and 1 part of benzoyl peroxide are mixed homogeneously, then transferred to a twin-screw extruder for reaction, the screw speed is 100rpm, The reaction temperature is 170°C, and the product is cooled, pelletized and dried to obtain modified polylactic acid.

[0036] 2. Processing of heat shrinkable film:

[0037] (1) Mix 100 parts of modified polylactic acid, 1 part of fatty alcohol polyoxyethylene ether AEO-9, 1 part of ethylene bisstearamide, 1 part of antioxidant 1076, 0.5 part of light stabilizer 944, and dry To the water content below 100ppm.

[0038] (2) Transfer the mixed material obtained in step (1) to a twin-screw extruder, melt extrude, and the melt extrusion temperature is 190°C, the die is cast, the cast sheet is wound, biaxially stretched, and the biaxially stretched temperature is 110°C, cooling and setting, and winding...

Embodiment 3

[0040] 1. Preparation of modified polylactic acid:

[0041] 95 parts of polylactic acid, 5 parts of allyl (diisopropylamino) dimethylsilane and 0.5 part of azobisisoheptanonitrile are mixed uniformly, and then transferred to a twin-screw extruder for reaction, and the screw speed is 150rpm , the reaction temperature is 190°C, and the product is cooled, pelletized, and dried to obtain modified polylactic acid.

[0042] 2. Processing of heat shrinkable film:

[0043] (1) Mix 100 parts of modified polylactic acid, 1 part of fatty alcohol polyoxyethylene ether AEO-9, 2 parts of calcium stearate, 0.5 part of antioxidant 1010, and 0.5 part of light stabilizer 944, and dry to contain The amount of water is less than 100ppm.

[0044] (2) Transfer the mixed material obtained in step (1) to a twin-screw extruder, melt extrude, and the melt extrusion temperature is 180°C, the die is cast, the cast sheet is wound, biaxially stretched, and the biaxially stretched temperature is 100°C, c...

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