Polyester biodegradation agricultural mulching film as well as preparation and application of polyester biodegradation agricultural mulching film

Abstract

The invention discloses a polyester biodegradation agricultural mulching film, which is prepared from A-J ingredients. Meanwhile, the invention discloses a preparation method and an application of the polyester biodegradation agricultural mulching film. The polyester biodegradation agricultural mulching film provided by the invention belongs to the polyester biodegradation agricultural mulching film which is prepared by a preparation method of aromatic dibasic acid introduction and dibasic alcohol copolyester chain extension modification and is used in Sinkiang regions. The polyester biodegradation agricultural mulching film has the advantages that the degradation period is controllable, the performance is excellent, the molecular weight is high, the branching degree is high, the crystallinity degree is high, few impurities are contained, and nontoxicity and biodegradability are realized.

Description

technical field [0001] The invention relates to a polymer, in particular to a polyester biodegradable agricultural mulch film and its preparation and application. Background technique [0002] Xinjiang is located in the hinterland of Eurasia, 34°-49° north latitude, 72°-96° east longitude, accounting for one-sixth of the country's total area. The introduction of plastic film mulching cultivation technology has greatly promoted the sustainable high-yield and stable development of agricultural production in Xinjiang, bringing significant economic benefits. In recent years, due to the shortage of labor resources in Xinjiang and the large-scale promotion and application of cotton pickers, it has become more difficult to recycle the residual film in the field. Due to the use of plastic film year after year, it accumulates in the plowing layer with the plowing of the soil every year. , destroy the soil structure, affect the soil air permeability and the growth and development of ...

AI Technical Summary

Problems solved by technology

Currently developed aromatic polyesters such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT) and other such polyesters 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

[0009] 1. The rate of degradation cycle cannot be adjusted, which leads to the degradation of biodegradable mulch film ahead of time or later, and loses the effect of mulch film on crop heat preservation, moisture conservation, and weed control;

[0010] 2. 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 degradable film. , Incomplete, forming residual fragments or powder, causing secondary pollution to the land;

[0011] 3. The problem of balance between water resistance and hydrophilicity cannot be solved. The finished mulch film cannot cling to the ground surface. Due to the strong wind in Xinjiang, it is easy to be broken or blown away, and its function as a mulch film is poor;

[0012] 4. Due to the low crystallinity, low branching degree, and large and uneven particle size of the produced masterbatch, the blown film is thicker, more consumables, and higher cost. It is not convenient for large-scale production and processing, and is not suitable for machinery in Xinjiang. layout

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