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Multi-layer co-extrusion based biodegradable mulch film and preparation method thereof

A biodegradable, multi-layer co-extrusion technology, applied in botany equipment and methods, chemical instruments and methods, lamination, etc. The high cost of mulching film preparation can achieve the effect of improving utilization rate and utilization efficiency, reducing groundwater pollution and increasing interface compatibility

Active Publication Date: 2017-03-22
GUANGDONG PROVINCIAL BIOENGINEERING INST (GUANGZHOU SUGARCANE IND RES INST)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the preparation process of this type of herbicidal mulch film, the amount of herbicide and other functional auxiliaries is large, and the cost of mulch film preparation is high, and some herbicides on the upper surface of the mulch film cannot exert their efficacy during the use of the mulch film, resulting in the loss of herbicides. Lost and wasted, causing pollution to the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Preparation of biodegradable herbicide masterbatch:

[0054] Mix atrazine with sorbitan laurate for 3 to 5 minutes, and ultrasonically activate it at 100 to 500 W for 3 to 25 minutes; then mix it with PBAT and glyceryl monostearate, and stir and mix at 600 to 1200 rpm for 1 ~5min, the mixing temperature does not exceed 60°C, extruding and granulating at 110~150°C to obtain the herbicide masterbatch.

[0055] Wherein, the mass percentages of each reactant are: PBAT 75%; atrazine 20%; sorbitan laurate 2.5%; glyceryl monostearate 2.5%.

[0056] Preparation of biodegradable weeding mulch film:

[0057] The weeding mulch film has a two-layer structure, the upper surface layer consists of 10wt% PLA, 89.7wt% PBAT and 0.1wt% antioxidant, 0.1wt% ultraviolet absorber, 0.1wt% light stabilizer, and the lower surface layer The components are 10wt% PLA, 60wt% PBAT and 30wt% herbicide masterbatch. The melt index of PLA used is 3-5g / 10min; the melt index of PBAT used is 3-5g / 10min. ...

Embodiment 2

[0060] Preparation of biodegradable herbicide masterbatch:

[0061] Mix atrazine with polyoxyethylene lauryl ether for 3 to 5 minutes, ultrasonically activate at 100 to 500 W for 3 to 25 minutes; then mix with PBAT and propylene glycol fatty acid ester, stir and mix at 600 to 1200 rpm for 1 to 5 minutes, and mix The temperature does not exceed 60°C, extruded and granulated at 110-150°C to obtain herbicide masterbatch.

[0062] Wherein, the mass percent of each reactant is: PBAT 75%; atrazine 10%; polyoxyethylene lauryl ether 5%; propylene glycol fatty acid ester 10%.

[0063] Preparation of biodegradable weeding mulch film:

[0064] The weeding mulch film has a three-layer structure, the upper surface layer consists of 15wt% PLA, 82wt% PBAT and 1wt% antioxidant, 1wt% ultraviolet absorber, 1wt% light stabilizer, the middle layer is PBAT, and the lower surface The layer components are 15wt% PLA, 75wt% PBAT and 10wt% herbicide masterbatch. The melt index of PLA used is 3-5g / 10...

Embodiment 3

[0067] Preparation of biodegradable herbicide masterbatch:

[0068] Mix atrazine with polyoxyethylene (4EO) sorbitan monostearate for 3 to 5 minutes, and ultrasonically activate it for 3 to 25 minutes at a power of 100 to 500 W; then mix it with PBAT and propylene glycol monostearate, and Stirring and mixing at 600-1200 rpm for 1-5 minutes, the mixing temperature does not exceed 60°C, extruding and granulating at 110-150°C to obtain the herbicide masterbatch.

[0069] Wherein, the mass percent of each reactant is: PBAT 30%; atrazine 60%; polyoxyethylene (4EO) sorbitan monostearate 5%; propylene glycol monostearate 5%.

[0070] Preparation of biodegradable weeding mulch film:

[0071] The herbicide mulch film has a two-layer structure, the upper surface layer is composed of 99.9wt% PBAT and 0.1wt% ultraviolet light absorber, and the lower surface layer is composed of 20wt% PLA, 77wt% PBAT and 3wt% herbicide mother grain. The melt index of PLA used is 3-5g / 10min; the melt ind...

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Abstract

The invention belongs to the technical field of agricultural films and discloses a multi-layer co-extrusion based biodegradable mulch film and a preparation method thereof. The mulch film adopts a two-layer or three-layer structure, wherein an upper surface layer contains 99wt%-99.9wt% of biodegradable resin A and 0.1wt%-1wt% of auxiliaries; a middle layer is the biodegradable resin A; a lower surface layer contains 70wt%-97wt% of the biodegradable resin A and 3wt%-30wt% of biodegradable herbicide master batches; preparation of the master batches comprises steps as follows: 10wt%-60wt% of herbicide is mixed with 0.5wt%-7wt% of a surfactant A with a hydrophilic-lipophilic balance value being 7-10, and an obtained mixture is subjected to ultrasonic activation; an obtained product is mixed with 25wt%-75wt% of biodegradable resin B and 1wt%-10wt% of a surfactant B with a hydrophilic-lipophilic balance value being 3-6 at a high speed, an obtained mixture is subjected to extrusion pelletization, and the herbicide master batches are obtained. A mass ratio of the surfactant A to the surfactant B is 1:1-1:2.

Description

technical field [0001] The invention belongs to the technical field of agricultural films, in particular to a multi-layer co-extruded biodegradable film and a preparation method thereof. Background technique [0002] Weed-killing mulch is a functional mulch product with weed-killing effect prepared by adding herbicides to plastic films. During the use of the mulch film, the herbicide diffuses to the surface of the mulch film to form a herbicidal molecular layer, which dissolves and drips to the ground together with the water droplets attached to the surface of the mulch film, and is absorbed by the soil to form a herbicide treatment layer with a certain concentration, which finally achieves the purpose of inhibiting the growth of weeds, And the purpose of causing weed death. Biodegradable weed-killing mulch film is prepared by mixing herbicide or herbicide masterbatch with fully biodegradable polymer resin with fully biodegradable polymer resin as the carrier. It has the fu...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08L67/04C08K9/04C08K5/3492C08K5/103C08J3/22A01G13/02B32B27/06B32B27/36B32B27/18B32B37/15
CPCA01G13/0275B32B27/08B32B27/18B32B27/36B32B37/153B32B2307/552B32B2307/71B32B2307/7163B32B2410/00C08J3/226C08J2367/02C08J2467/02C08L67/02C08L2201/06C08L2201/08C08L2203/16C08L2205/02C08L67/04C08K9/04C08K5/3492C08K5/103
Inventor 陈骏佳谢东陈明周杨友军潘东英张会平高旭华陈东城黄瑶珠
Owner GUANGDONG PROVINCIAL BIOENGINEERING INST (GUANGZHOU SUGARCANE IND RES INST)
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