Preparation method of environmentally friendly degradable agricultural film

An agricultural film and environmental protection technology is applied in the field of preparation of environmentally friendly and degradable agricultural films, which can solve the problems of poor film degradation efficiency, affect crop growth efficiency, and different degradation degrees, and achieve improved mechanical properties and degradation performance. High freeze-thaw stability, the effect of improving light transmission performance

Inactive Publication Date: 2019-08-06
HEBEI JIASHICHENG ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The degradation efficiency of the film given in the existing literature is not very good, and the light transmittance is poor, which affects the growth efficiency of crops, so it needs to be further improved to increase its application rate
[0004] Chinese patent document (notification number: CN107254130B) discloses a degradable agricultural film, which involves the field of agricultural film technology, including the following process: (1) nano-Al3+/TiO2 modified polyvinyl alcohol, esterified starch, plasticizer and After the water is mixed and stirred evenly, the mixed material is obtained; (2) the mixed material is added to a twin-screw extruder and extruded into a uniform transparent sol; (3) the sol is cast on a drum casting machine to form a film; (4) After drying, cooling, trimming and winding, the degradable agricultural film can be obtained. The film

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The preparation method of a kind of environment-friendly degradable agricultural film of this embodiment comprises the following steps:

[0026] Step 1, weighing the following raw materials by weight: 50 parts of film grade polyethylene, 20 parts of chitosan modified distarch phosphate, 3 parts of rare earth modified liquid, 2 parts of activated cellulose whiskers, 10 parts of polyvinyl alcohol, 2 parts of degradation aids;

[0027] Step 2, adding film-grade polyethylene, chitosan-modified distarch phosphate, rare earth modified liquid, activated cellulose whiskers, polyvinyl alcohol, and degradation aids to the agitator in order to stir in step 1, Then carry out melting treatment at 110°C for 10 minutes to obtain the pretreated material;

[0028] Step 3: Add the pretreated material in step 2 to a twin-screw extruder for extrusion treatment, the extrusion temperature is 155°C, and then send it to a film blowing machine to make a film, and then place it at 10°C for air ...

Embodiment 2

[0037] The preparation method of a kind of environment-friendly degradable agricultural film of this embodiment comprises the following steps:

[0038] Step 1, weighing the following raw materials by weight: 70 parts of film grade polyethylene, 30 parts of chitosan modified distarch phosphate, 6 parts of rare earth modified liquid, 5 parts of activated cellulose whiskers, 20 parts of polyvinyl alcohol, 6 parts of degradation aids;

[0039] Step 2, adding film-grade polyethylene, chitosan-modified distarch phosphate, rare earth modified liquid, activated cellulose whiskers, polyvinyl alcohol, and degradation aids to the agitator in order to stir in step 1, Then carry out melting treatment at 120°C for 20 minutes to obtain the pretreated material;

[0040] Step 3: Add the pretreated material in step 2 to a twin-screw extruder for extrusion treatment, the extrusion temperature is 165°C, and then send it to a film blowing machine to make a film, and then place it at 20°C for air ...

Embodiment 3

[0049] The preparation method of a kind of environment-friendly degradable agricultural film of this embodiment comprises the following steps:

[0050] Step 1, weighing the following raw materials by weight: 60 parts of film grade polyethylene, 25 parts of chitosan modified distarch phosphate, 4.5 parts of rare earth modified liquid, 3.5 parts of activated cellulose whiskers, 15 parts of polyvinyl alcohol, 4 parts of degradation aids;

[0051] Step 2, adding film-grade polyethylene, chitosan-modified distarch phosphate, rare earth modified liquid, activated cellulose whiskers, polyvinyl alcohol, and degradation aids to the agitator in order to stir in step 1, Then carry out melting treatment at 115°C for 15 minutes to obtain the pretreated material;

[0052] Step 3: Add the pretreated material in step 2 to a twin-screw extruder for extrusion treatment, the extrusion temperature is 160°C, and then send it to a film blowing machine to make a film, and then place it at 15°C for ...

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Abstract

A preparation method of environmentally friendly degradable agricultural film is disclosed. The method includes 1) weighing raw materials including, by weight, 50-70 parts of film-grade polyethylene,20-30 parts of chitosan modified distarch phosphate, 3-6 parts of a rare earth modification liquid, 2-5 parts of activated cellulose whiskers, 10-20 parts of polyvinyl alcohol, and 2-6 parts of a degradation aid. The film-grade polyethylene as the base material and the distarch phosphate as an auxiliary material are adopted to improve degradability of the film; the distarch phosphate is modified starch, has high stability to influences caused by acid, base and shearing force, has high freezing stability and thawing stability, and after modification with chitosan, can improve degradability of the film when applied to the film. In addition, added polybutylene succinate is subjected to strip drawing after molding.

Description

technical field [0001] The invention relates to the technical field of agricultural films, in particular to a preparation method of an environmentally friendly and degradable agricultural film. Background technique [0002] Agricultural film is a general term for plastic films used in agricultural production. It plays a very important role in moisturizing and heat preservation during the sowing period. Weeding film is a new type of agricultural plastic film. made of medicine. Weeding mulch can be divided into the following two types. That is, mulch films containing herbicides and mulch films containing sunscreening agents, and mulch films containing sunscreening agents: based on high-pressure polyethylene resin and linear low-density polyethylene resin, black masterbatch and antioxidants are added, and ultraviolet The black film produced by the light absorber through a film blowing machine is widely used in high-efficiency agriculture because it does not contain herbicides...

Claims

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Application Information

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IPC IPC(8): C08L23/08C08L3/06C08L5/08C08L67/02C08L1/04C08L29/04C08L91/00C08K5/098C08J5/18
CPCC08J5/18C08J2323/08C08J2401/04C08J2403/06C08J2405/08C08J2429/04C08J2467/02C08J2491/00C08K5/098
Inventor 程殿武杨明美朱德伟朱德荣
Owner HEBEI JIASHICHENG ENERGY TECH CO LTD
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