Improved biodegradable shopping bag and preparation method thereof

Abstract

The invention relates to an improved biodegradable shopping bag which comprises polylactic acid serving as a main component, one or more of PBAT (poly-butyleneadipate-co-terephthalate) or PBS (poly-butylene succinate) or polyhydroxyalkanoate serving as another main component, and a modified inorganic filler serving as a secondary component. The shopping bag prepared by the method provided by the invention eliminates white pollution and improves urban ecological environment.

Description

technical field [0001] The invention relates to an improved biodegradable shopping bag and a preparation method thereof. Background technique [0002] Shopping bags provide great convenience to people in daily life, and are essential items for people to go shopping. The shopping bags currently available on the market mainly include: plastic shopping bags, non-woven shopping bags, paper shopping bags, cotton and linen shopping bags, etc. Plastic shopping bags include ordinary plastic shopping bags, starch-based plastic shopping bags and degradable plastic shopping bags. Among them, ordinary plastic shopping bags are difficult to degrade. Starch-based plastic shopping bags rely on food, so the prospects are not good. The country has been widely promoted, but its high cost makes it difficult to promote it on a large scale in the country in a short period of time. Non-woven shopping bags are non-woven fabrics made of plastics such as polypropylene or polyethylene terephthalate...

AI Technical Summary

Problems solved by technology

The currently developed aromatic polyesters such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), etc. Strong water resistance, resistant to bacterial erosion, etc., cannot be biodegraded under natural conditions

Aliphatic polyesters such as poly 3-hydroxyalkanoate (PHA), polybutylene succinate (PBS), etc., such aliphatic polyesters are known for their good biocompatibility, biodegradability, etc. Its characteristics are attracting more and more attention, and it is applied in the fields of biomedical materials and injection molding products, but there are also some shortcomings in the process of practical application: such as relatively expensive price, too fast biodegradation rate, poor thermal stability, relatively poor mechanical properties, Easy hydrolysis, easy aging, high impurity content and other shortcomings, which limit the application of this type of polyester material in some fields

[0008] 1. The manufactured masterbatch cannot be restructured with polyethylene resin, but only physically mixed and filled. It is a form of encapsulation and cannot form a network bridging structure with a 'knot' effect, resulting in uneven degradation of the degraded shopping bag. , Incomplete, forming residual fragments or powder, causing secondary pollution to the land;

[0009] 2. Due to the low crystallinity, low branching degree, and large and uneven particle size of the produced masterbatch, the blown shopping bags are thicker, more consumables, and higher cost, which is not convenient for large-scale production and processing

It adopts the preparation method of adding fillers and silane modifiers simultaneously, but we have found through experiments that this method has a certain effect on the improvement of mechanical properties, but there is still room for improvement

It has also been reported that two kinds of silane modifiers are used to improve the filler, but this improvement in the performance of the final product is also limited

Images