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Method for covering mulching film by extruding and casting PVA sol

A technology of extrusion casting and covering film, which is applied in the direction of botany equipment and methods, plant protection, application, etc., can solve the problems of inability to use, loss of strength, etc., improve moisture content, increase viscosity and water storage rate, and facilitate the realization of Effect

Pending Publication Date: 2021-11-02
北京惠林苑生物科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, common biodegradable mulches are mainly composed of materials such as PBAT and PLA. Due to their biodegradability, the mulch films of this material have high requirements for storage conditions. Otherwise, during long-term storage and transportation, they will biodegrade and lose their strength. cause unusable

Method used

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  • Method for covering mulching film by extruding and casting PVA sol
  • Method for covering mulching film by extruding and casting PVA sol
  • Method for covering mulching film by extruding and casting PVA sol

Examples

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preparation example Construction

[0033] The preparation method of the modified starch slurry comprises the following steps: (1) Paste making: adding the starch into a sodium hydroxide solution with a pH of 8-9, mixing and stirring to form a starch slurry, and heating at 80-90° C. to form a paste-like starch Serum, the mass concentration of starch in the starch slurry is 80% to 90%; (2) Modification reaction: by weight ratio, in 100 parts of pasty starch slurry, add 20 parts of diisocyanate, 20-40 parts of acrylic acid hydroxyl Ethyl ester and 0.1-1 part of stannous octoate, then react at 75°C to 105°C for 1-5h to obtain modified starch slurry.

[0034] The starch is one or a combination of corn starch, thermoplastic starch, wood flour and potato starch.

Embodiment 1

[0037]A method for extruding and casting PVA sol to cover plastic film, comprising the steps of: (1) preparing modified starch slurry: first, adding cornstarch to a sodium hydroxide solution with a pH of 8, mixing and stirring to form a starch slurry, and heating at 80°C to form a starch slurry. Pasty starch slurry, the mass concentration of starch in the starch slurry is 80%; then, in the above-mentioned 100 parts of pasty starch slurry, add 20 parts of diisocyanate, 20 parts of hydroxyethyl acrylate and 0.1 part of octanoic acid in sequence stannous, then react at 75°C for 1h to obtain a modified starch slurry;

[0038] (2) Prepare PVA sol by the following mass parts:

[0039]

[0040] (3) Extrude and cast PVA sol to form a film with an extrusion cast film laminating machine, and directly lay the film on the surface of the field. The specific steps are: first, add the PVA sol to the storage tank 114, and start the diesel generator 111 , energize the heating jacket of the...

Embodiment 2

[0043] A method for extruding and casting PVA sol to cover plastic film, comprising the steps of: (1) preparing modified starch slurry: first, adding potato starch into a sodium hydroxide solution with a pH of 9, mixing and stirring to form a starch slurry, and heating at 90°C to form a starch slurry. Pasty starch slurry, the mass concentration of starch in the starch slurry is 90%; then, in the above-mentioned 100 parts of pasty starch slurry, add 20 parts of diisocyanate, 40 parts of hydroxyethyl acrylate and 1 part of octanoic acid in sequence stannous, then react at 105°C for 5h to obtain modified starch slurry;

[0044] (2) Prepare PVA sol by the following mass parts:

[0045]

[0046] (3) Extrude and cast PVA sol to form a film with an extrusion cast film laminating machine, and directly lay the film on the surface of the field. The specific steps are: first, add the PVA sol to the storage tank 114, and start the diesel generator 111 , energize the heating jacket of ...

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Abstract

The invention provides a method for covering a mulching film by extruding and casting PVA sol. The method comprises the following steps: preparing PVA sol; and extruding and casting the PVA sol to form a film by using an extrusion casting film laminating machine, and directly paving the film on the surface of a field. The extrusion casting film laminating machine is provided with forward power by a tractor; the extrusion casting film laminating machine comprises an extrusion casting unit and a flat car, the extrusion casting unit is fixed on the flat car, and the extrusion casting unit comprises a diesel generator, a motor, a pump, a storage tank and a casting die head; the diesel generator supplies power to the motor and a heating sleeve on the storage tank; the motor is connected with the pump through a reducer, an inlet of the pump is connected with an outlet of the storage tank through a pipeline, and an outlet of the pump is connected with a feeding port of the casting die head through a pipeline. The method is easy to operate, the storage problem of the biodegradable mulching film is avoided, processing and forming are easy, the mulching film is attached to the ground by fully utilizing the flexibility and viscidity of the mulching film extruded at high temperature, the mulching film is firmer and cannot be broken by wind or peeled, and the use characteristic is excellent.

Description

technical field [0001] The invention relates to the field of agricultural mulch films, in particular to a method for extruding and casting PVA sol to cover mulch films. Background technique [0002] Biodegradable agricultural film is an important agricultural production material after seeds, fertilizers, and pesticides. Its application has brought an environmental protection revolution to agricultural production, and has made important contributions to agricultural efficiency, farmers' income, and environmental protection. Commonly used biodegradable films are polylactic acid films and PBAT-PLA mulch films. At present, the coverage area of ​​biodegradable plastic film has increased every year on average, and the introduction of the current environmental protection policy has led to an increase in the coverage area of ​​biodegradable plastic film and the actual annual consumption. With the rapid development of agricultural science and technology, the demand for plastic film ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L29/04C08L3/04B29D7/01A01G13/02
CPCC08J5/18B29D7/01A01G13/0275C08J2329/04C08J2403/04Y02A40/28
Inventor 苑会林郝钦邹本飞
Owner 北京惠林苑生物科技有限公司
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