CN-224219049-U - PBAT degradable agricultural mulching film with fertilizer controlled release function

Abstract

The utility model relates to the field of agricultural mulching films, and mainly provides a PBAT degradable agricultural mulching film with a fertilizer controlled release function, aiming at the problems of serious pollution and low fertilizer utilization rate of the traditional agricultural mulching film at present. The mulching film comprises a PBAT supporting layer and is characterized by further comprising a fertilizer controlled release layer which is laminated on the PBAT supporting layer, wherein the fertilizer controlled release layer comprises a structure body formed by compounding cellulose nanofibers and urea particles, the cellulose nanofibers form a continuous three-dimensional network in the fertilizer controlled release layer, the urea particles are dispersed in the three-dimensional network, the diameter distribution range of the cellulose nanofibers is 10-60 nm, and the length-diameter ratio distribution range is 10-200. The controlled release layer with the specific composite layer structure can gradually release urea into soil in the degradation process, so that the aim of slow controlled release of the fertilizer is fulfilled, and meanwhile, various functions such as heat preservation, moisture preservation and the like are effectively provided for crops.

Inventors

• YU SHUHONG
• LI DEHAN
• HAN ZIMENG
• GUAN QINGFANG

Assignees

• 中国科学技术大学

Dates

Publication Date

20260512

Application Date

20241125

Claims (4)

1. 1. The PBAT degradable agricultural mulching film with the fertilizer controlled release function comprises a PBAT supporting layer (1), wherein the PBAT is poly (adipic acid)/butylene terephthalate, and is characterized by further comprising a fertilizer controlled release layer (2) which is laminated on the PBAT supporting layer (1), wherein the fertilizer controlled release layer (2) is provided with a continuous cellulose nanofiber three-dimensional network and urea particles uniformly dispersed in the three-dimensional network, the diameter distribution range of the cellulose nanofibers is 10-60 nm, the length-diameter ratio distribution range is 10-200, the particle size of the urea particles is 0.85-2.80 mm, and the thickness of the fertilizer controlled release layer (2) is 5-10 mu m.
2. 2. The PBAT degradable agricultural mulch film with fertilizer release control function as claimed in claim 1, wherein the thickness of the PBAT supporting layer (1) is 10-20 μm.
3. 3. The PBAT degradable agricultural mulch film with fertilizer controlled release function as claimed in claim 1, wherein no adhesive layer exists between the PBAT supporting layer (1) and the fertilizer controlled release layer (2).
4. 4. The PBAT degradable agricultural mulch film with fertilizer controlled release function as claimed in claim 1, wherein the fertilizer controlled release layer (2) completely covers the PBAT supporting layer (1).

Description

PBAT degradable agricultural mulching film with fertilizer controlled release function Technical Field The utility model relates to the field of agricultural mulching films, in particular to a PBAT degradable agricultural mulching film with a fertilizer controlled release function. Background Polybutylene adipate/terephthalate (PBAT), which is a thermoplastic biodegradable plastic, is a copolymer of butylene adipate and butylene terephthalate. The material has excellent biodegradability, and can be decomposed into water, carbon dioxide and organic matters by microorganisms in natural environment, so that the pollution to the environment is reduced. PBAT and its derived composites are commonly used in the manufacture of biodegradable plastic articles such as packaging materials, agricultural films, household goods, medical devices, and the like. In addition, the PBAT has good plasticity and processability, so that the PBAT can adapt to the production requirements of mulching films of various specifications, and can effectively provide heat preservation, moisture preservation, weed growth prevention and other functions for crops. Compared with the traditional agricultural mulching film, the PBAT agricultural mulching film can be naturally degraded into carbon dioxide and water within a certain period of time after being used, can not cause persistent pollution to soil, is beneficial to maintaining ecological balance and long-term fertility of the soil, reduces pollution to the environment, and realizes good balance of agricultural production and environmental protection. Currently, in crop management, fertilization methods cover a variety of strategies such as surface broadcast application, combined irrigation application, and deep burial. However, for traditional quick-acting chemical fertilizers, the release pattern and speed of the fertilizer in the soil are not easy to realize fine regulation. Because of its rapid dissolution characteristics, such fertilizers tend to run off with moisture migration when subjected to rain wash or applied through irrigation systems, resulting in serious nutrient loss problems. This not only results in a great waste of agricultural production resources, but also may cause a risk of pollution of groundwater and the soil environment. In addition, the traditional fertilization mode tends to throw in quick-acting fertilizers with larger dosages at one time, and the method cannot accurately adapt to the dynamic change of nutrient requirements of crops in different growth stages. Excessive nutrient supply may occur in the early stage, but with the promotion of crop growth and development, the problem of insufficient nutrient supply is faced in the later stage, so that the effective utilization rate of fertilizer nutrients is reduced, and the continuous optimization of crop yield and quality is not facilitated. Therefore, the improvement of fertilization technology and strategy ensures timely release of nutrients as required, and becomes an urgent requirement for efficient and environment-friendly production of modern agriculture. The PBAT mulch can be combined with the fertilizer controlled release layer through structural design, so that the novel PBAT-based degradable mulch material with the controlled release function is manufactured. The controlled release layer of the controlled release mulch can effectively regulate and control the release rate of the fertilizer, thereby improving the use efficiency of the fertilizer and reducing the potential pollution to the ecological environment. Therefore, the realization of uniform and continuous controlled release of the fertilizer in the degradation process of the PBAT mulching film is a problem to be solved in the field while the mechanical strength, the degradation performance and the visible light transmittance of the PBAT agricultural mulching film are not affected. Disclosure of utility model The utility model mainly aims at the problems of serious pollution and low fertilizer utilization rate of the traditional agricultural mulching film at present, and provides the PBAT degradable agricultural mulching film with the fertilizer controlled release function, which not only can keep the visible light transmittance and the mechanical property of the mulching film, but also has an excellent fertilizer controlled release function so as to realize slow release of the fertilizer, gradually release nutrients according to the growth requirement of crops, and help to avoid excessive application of the fertilizer. In order to solve the technical problems, the utility model adopts the solution that the PBAT degradable agricultural mulching film with the fertilizer controlled release function is provided, the mulching film comprises a PBAT supporting layer (1), and is characterized by further comprising a fertilizer controlled release layer (2) which is laminated on the PBAT supporting layer (1), wherein the fertilizer controlled release lay