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Full-degradable shopping bag film and preparation method thereof

A shopping bag film, fully degradable technology, applied in the field of composite materials, can solve the problems such as the potential value of hemicellulose has not been paid attention to, the calorific value of hemicellulose is low, and the plastic film is degraded and destroyed, and the product is green, environmentally friendly and efficient. , the effect of reducing usage

Inactive Publication Date: 2021-08-13
SHANGHAI CHANGFA NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the potential value of hemicellulose has not been paid attention to by people. For example, in chemical pulp, cellulose from agricultural and forestry biomass raw materials is mainly used, and hemicellulose, which accounts for about 20% to 38% of its content, will It is dissolved in the waste liquid during cooking; even if the waste liquid is burned to obtain energy, the calorific value of hemicellulose is very low, which still causes a great waste of resources; starch has a wide range of sources, low price, safe and non-toxic Harmful advantages, and it is a renewable resource, with the help of amylase in the soil, the plastic film can be degraded and destroyed

Method used

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  • Full-degradable shopping bag film and preparation method thereof
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  • Full-degradable shopping bag film and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0054] A fully degradable shopping bag film and a preparation method thereof, calculated in parts by mass, its composition and content are as follows:

[0055]

[0056] Above-mentioned formula reacts according to the following steps:

[0057] 1. Put the PBAT, hemicellulose, cornstarch, glycerin, maleic anhydride grafting material PBAT, and stearic acid in the above-mentioned raw materials together in a high-speed blender at a speed of 100 rpm, and mix for 60 minutes to obtain an initial mixture;

[0058] 2. Put the above primary mixture in a twin-screw extruder to extrude and granulate. The temperature in the first zone to the sixth zone is 120°C, 135°C, 145°C, 165°C, 175°C, 175°C, and the head temperature is 175°C. The screw speed is 180rpm, and the masterbatch is obtained by melt extrusion;

[0059] 3. Put the above-mentioned masterbatch into a film blowing machine, and blow it into a bag at a temperature of 180°C to prepare a degradable shopping bag.

Embodiment 2

[0061] A fully degradable shopping bag film and a preparation method thereof, calculated in parts by mass, its composition and content are as follows:

[0062]

[0063]

[0064] Above-mentioned formula reacts according to the following steps:

[0065] 1. The above-mentioned PBAT, PLA, hemicellulose, cornstarch, maleic anhydride grafted PBAT, epoxy soybean oil, DCP, stearic acid are placed in a high-speed blender together, and mixed for 70min at a rotating speed of 150rpm to obtain Primer.

[0066] 2. Put the above-mentioned primary mixture in a twin-screw extruder to extrude and granulate. The temperature in the first zone to the sixth zone is 130°C, 145°C, 160°C, 180°C, 185°C, 180°C, and the head temperature is 180°C. The screw speed is 180rpm, and the masterbatch is obtained by melt extrusion.

[0067] 3. Put the masterbatch above into a film blowing machine, and blow it into bags at 180°C to prepare a degradable shopping bag film.

Embodiment 3

[0069] A fully degradable shopping bag film and a preparation method thereof, calculated in parts by mass, its composition and content are as follows:

[0070]

[0071] Above-mentioned formula reacts according to the following steps:

[0072] 1. Put the above-mentioned PBAT, hemicellulose, wheat starch, maleic anhydride grafted PBAT, glycerin, and calcium stearate together in a high-speed blender at a speed of 220 rpm, and mix for 40 minutes to obtain an initial mixture.

[0073] 2. Put the above-mentioned primary mixture in a twin-screw extruder to extrude and granulate. The temperature in the first zone to the sixth zone is 110°C, 135°C, 150°C, 160°C, 160°C, 165°C, and the head temperature is 165°C. The screw speed is 160rpm, and the masterbatch is obtained by melt extrusion.

[0074] 3. Put the masterbatch above into a film blowing machine, and blow it into bags at 165°C to prepare a degradable shopping bag film.

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Abstract

The invention discloses a full-degradable shopping bag film and a preparation method thereof. The full-degradable shopping bag film comprises the following components in parts by weight: 45-90 parts of biodegradable resin, 5-30 parts of hemicellulose, 5-25 parts of starch, 1-8 parts of a plasticizer, 1-8 parts of a compatilizer, 0.5-3 parts of a cross-linking agent and 1-5 parts of a dispersing agent. The preparation method comprises the following steps: uniformly mixing the biodegradable resin, the hemicellulose, the starch, the plasticizer, the compatilizer, the cross-linking agent and the dispersing agent, carrying out melt extrusion through a twin-screw extruder to obtain bio-based fully-degradable particles, and carrying out blow molding to prepare the bag. According to the full-degradable shopping bag film disclosed by the invention, the hemicellulose and the biodegradable resin are subjected to blending modification, so that the prepared full-degradable shopping bag film has good mechanical properties, can meet the use requirements, also greatly reduces the raw material cost, is green, environment-friendly and degradable, conforms to the sustainable development view, and is easier to popularize.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a fully degradable shopping bag film and a preparation method thereof. Background technique [0002] The plastic shopping bags currently on the market are basically made of petroleum-based polyolefins, which are very difficult to degrade. Most of the secondary uses of shopping bags are garbage bags. The plastic shopping bags filled with garbage are partially incinerated, and the rest are transported to landfills, which is easy to cause damage to the ecological environment. Constantly rising, resulting in rising costs. Therefore urgently need to find a kind of film bag product that can replace petroleum base, and alleviate the pressure of resources. [0003] Hemicellulose is the most abundant polysaccharide except cellulose, which accounts for one-third of the renewable biological resources on the earth. It is a renewable and easily degradable raw material with great potential...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/02C08L67/04C08L3/02C08L5/14C08J5/18
CPCC08J5/18C08J2367/02C08J2405/14C08J2403/02C08J2467/04
Inventor 施晓旦甄晓宇金霞朝
Owner SHANGHAI CHANGFA NEW MATERIAL CO LTD