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Biodegradable polyester composition film with high heat sealing strength and preparation method of film

A technology of biodegradable polyester and composition, which is applied in the manufacture of rigid/semi-rigid containers, container manufacturing machinery, box making operations, etc., can solve the problem of not having a biodegradable polyester film with high heat-sealing strength, and achieve Excellent heat-sealing strength, simple and easy preparation process, and the effect of improving heat-sealing strength

Active Publication Date: 2013-02-13
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, in practical applications, if the biodegradable film is used as a load-bearing film such as a shopping bag, the heat-sealing strength becomes an indicator that must be considered. However, there is no biodegradable polyester with high heat-sealing strength in the prior art. film

Method used

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  • Biodegradable polyester composition film with high heat sealing strength and preparation method of film
  • Biodegradable polyester composition film with high heat sealing strength and preparation method of film
  • Biodegradable polyester composition film with high heat sealing strength and preparation method of film

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preparation example Construction

[0090] The preparation method of substance A is prior art.

[0091] Flexible polymer material A, as a component in the composition, can make the film have better flexibility and ductility, preferably polybutylene succinate, polybutylene succinate-co-adipic acid Butanediol esters, polybutylene terephthalate-co-butylene adipate or polyεcaprolactone, especially preferably polybutylene succinate or polybutylene terephthalate- co-butylene adipate.

[0092] The film in the present invention is made up of different types of biodegradable polymers, so it is necessary to increase the compatibility between different types of polymers by adding a compatibilizer; material B is formed by copolymerization of polymers with different structures, It has the molecular structure of two or more homopolymers to act as a compatibilizer, and when substance B is added to the blend, the compatibility of each component in the blend is significantly improved; preferably, The content of the polylactic ...

Embodiment 1

[0137] With 50wt% polybutylene succinate A, 10wt% polylactic acid and polybutylene succinate block copolymer B2, the number average molecular weight is 1 × 10 5 , 30wt% linear polylactic acid, the number average molecular weight is 1×10 5 , 5wt% ethylene-acrylate-maleic anhydride or glycidyl methacrylate terpolymer D, 5wt% hydrogenated rosin pentaerythritol ester E several materials are premixed in a mixer, and then granulated in a twin-screw extruder , the temperature of the extruder is: 140°C, 160°C, 170°C, 170°C, 165°C, and then the blend particles are blown into a film by a film blowing machine, and the thickness of the film is adjusted to about 0.02mm, wound up, and finally in Heat sealing is carried out in the slitting machine, and the tensile strength, heat sealing strength and elongation at break of the product are tested. The test results are shown in Attached Table 1.

Embodiment 2

[0139] With 50wt% polybutylene terephthalate-co-butylene adipate A, 10wt% polylactic acid and polybutylene terephthalate-co-butylene adipate B2, several The average molecular weight is 1.5×10 5 , 20wt% linear polylactic acid, the number average molecular weight is 1×10 5 , 10wt% five-arm branched polylactic acid with a molecular weight of 5×10 4 , 5wt% ethylene-n-butyl acrylate-glycidyl methacrylate copolymer terpolymer D, 5wt% C5 petroleum resin E premixed several materials in a mixer, and then granulated in a twin-screw extruder , the temperature of the extruder is: 145°C, 165°C, 175°C, 175°C, 170°C, and then the blend particles are blown into a film by a film blowing machine, and the thickness of the film is adjusted to about 0.02mm, wound, and finally in Heat sealing is carried out in the slitting machine, and the tensile strength, heat sealing strength and elongation at break of the product are tested. The test results are shown in Attached Table 1.

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Abstract

The invention discloses a biodegradable polyester composition film with high heat sealing strength and a preparation method of the composition film, solving the problem that a biodegradable film with high heat sealing strength does not exist in the prior art. The film consists of the following components in percentage by weight: 1 to 80 weight percent of flexible biodegradable macromolecular material, 1 to 30 weight percent of compatibilization copolymer, 1 to 80 weight percent of one or two of linear polylactic acid and dobby branched polylactic acid, 0.1 to 15 weight percent of small molecular compound or macromolecular compound containing functional groups reacting with terminal hydroxyl or terminal carboxyl, and 0.1 to 15 weight percent of thickening agent. The composition film can be completely biodegradable, the tensile strength is at least 20MPa, the elongation at break is at least 200 percent, and the heat sealed position is not broken when the film is elongated at break.

Description

technical field [0001] The invention relates to a biodegradable polyester composition film with high heat-sealing strength and a preparation method thereof, belonging to the field of biodegradable polymer materials. Background technique [0002] Since plastic products entered people's lives on a large scale in the 1960s, the disposal of waste plastic products has always been a thorny issue. The service life of plastic products is relatively short, ranging from a few years to more than ten years, while the degradation of plastics is a long process, usually lasting hundreds of years. The disposal of waste plastics is mainly based on incineration and landfill. The incineration of plastics will produce a large amount of poisonous gas, and the method of landfill will make the land that is not abundant even more tense. Plastic film is generally a disposable product. If waste plastic film cannot be properly disposed of, it will cause serious ecological disasters and visual polluti...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08L67/04C08L23/08C08L93/00C08L57/02C08L45/00C08L3/06B31B1/64B31B50/64
Inventor 刘焱龙冯立栋项盛孙彬边新超陈学思
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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