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Preparation method of high-thermal-insulation/soil-moisture-preservation degradable agricultural mulching film material

A technology of agricultural mulch film and high heat preservation, which is applied in the field of preparation of degradable agricultural mulch film materials with high heat preservation and moisture retention, can solve the problems of slow promotion progress, low glass transition temperature, and poor film-forming properties, and achieve stable film blowing process, blown film The effect of controllable specifications and good mechanical properties

Active Publication Date: 2016-08-17
BEIJING CO FOUND HIGH TECH INCUBATOR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

China is also looking for degradable agricultural mulch film materials with high thermal insulation and moisture retention that can replace traditional mulch films. However, biodegradable materials mainly based on PLA have high strength and brittleness, and poor film-forming properties; although PPC has good biodegradability and processability , but the mechanical strength is not high, and the glass transition temperature is low, both of which have defects in the field of agricultural mulch
PBAT has good film-forming performance and certain heat resistance, which meets the requirements of agricultural mulch film. However, due to its high cost and narrow application range, the promotion progress is slow.

Method used

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  • Preparation method of high-thermal-insulation/soil-moisture-preservation degradable agricultural mulching film material
  • Preparation method of high-thermal-insulation/soil-moisture-preservation degradable agricultural mulching film material
  • Preparation method of high-thermal-insulation/soil-moisture-preservation degradable agricultural mulching film material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] First, weigh the raw materials for the anti-degradation masterbatch extrusion experiment. The mass percentage of each substance in the total mass of the anti-degradation masterbatch is: 75% of PBAT, 10% of antioxidant 126, 5% of light stabilizer zinc oxide, 10% Anti-hydrolysis agent carbodiimide; set screw temperature to 160°C, 165°C, 170°C, 175°C, 175°C, 180°C, 185°C, 185°C, 175°C, 170°C, head temperature to 175°C , The feeding rate is 5kg / h. The anti-degradation masterbatch was obtained by extrusion, dried at 85°C for 6 hours, and set aside.

[0023] Secondly, the mass percentage of raw materials used in the preparation process of PPC / PLA modified degradable plastic PBAT is:

[0024]

[0025]

[0026] Again, weigh PBAT, PPC, PLA, and anti-degradation masterbatch according to the above mass percentage, and dry at 85°C for 5-12 hours according to the material characteristics. After cooling to room temperature, perform mechanical mixing with a high-mixing mixer, a...

Embodiment 2

[0029] First, weigh the raw materials for the anti-degradation masterbatch extrusion experiment. The mass percentage of each substance in the total mass of the anti-degradation masterbatch is: 75% of PBAT, 10% of antioxidant 126, 5% of light stabilizer zinc oxide, 10% Anti-hydrolysis agent carbodiimide; set screw temperature to 160°C, 165°C, 170°C, 175°C, 175°C, 180°C, 185°C, 185°C, 175°C, 170°C, head temperature to 175°C , The feeding rate is 10kg / h. The anti-degradation masterbatch was obtained by extrusion, dried at 85°C for 6 hours, and set aside.

[0030] Secondly, the mass percentage of raw materials used in the preparation process of PPC / PLA modified degradable plastic PBAT is:

[0031]

[0032] Again, weigh PBAT, PPC, PLA, and anti-degradation masterbatch according to the above mass percentage, and dry at 85°C for 5-12 hours according to the material characteristics. After cooling to room temperature, perform mechanical mixing with a high-mixing mixer, and set asid...

Embodiment 3

[0035]First, weigh the raw materials for the anti-degradation masterbatch extrusion experiment. The mass percentage of each substance in the total mass of the anti-degradation masterbatch is: 75% of PBAT, 7% of antioxidant 126, 3% of light stabilizer titanium dioxide, 15% of Anti-hydrolysis agent phenyl glycidyl ether; set screw temperature to 160°C, 165°C, 170°C, 175°C, 175°C, 180°C, 185°C, 185°C, 175°C, 170°C, head temperature to 175°C , The feeding rate is 15kg / h. The anti-degradation masterbatch was obtained by extrusion, dried at 85°C for 6 hours, and set aside.

[0036] Secondly, the mass percentage of raw materials used in the preparation process of PPC / PLA modified degradable plastic PBAT is:

[0037]

[0038] Again, weigh PBAT, PPC, PLA, and anti-degradation masterbatch according to the above mass percentage, and dry at 85°C for 5-12 hours according to the material characteristics. After cooling to room temperature, perform mechanical mixing with a high-mixing mix...

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Abstract

The invention relates to a preparation method of a high-thermal-insulation / soil-moisture-preservation degradable agricultural mulching film material. The agricultural mulching film is prepared from PBAT (poly(butyleneadipate-co-terephthalate)), PPC (polypropylene carbonate), PLA (polylactic acid), an anti-degradation master batch, an opening agent, a compatilizer, a chain extender and a starch surface treating agent. The preparation method comprises the following steps: proportionally weighing all the raw materials, carrying out drying pretreatment on the PBAT, PPC, PLA and anti-degradation master batch, carrying out batch mixing, sending the mixture into a double screw extruder through different agravic weighers, melting by heating, carrying out extrusion, drawing, cooling, granulation and drying to obtain granules, and sealing and storing in an aluminum-plastic packaging bag. The film blowing experiment proves that the degradable plastic can completely satisfy the mulching film demands. The minimum thickness of the film can reach 6 mu m. The preparation method has the advantages of stable film blowing technique and controllable size of the blown film. The mulching film material has the characteristics of favorable mechanical properties, high thermal insulation property, high soil moisture preservation property, high light transmittance, lower price and the like, can be completely degraded into water and carbon dioxide after being buried underground after use, and thus, satisfies the environmental requirements.

Description

technical field [0001] The invention relates to the technical field of agricultural mulching materials, in particular to a preparation method of a degradable agricultural mulching material with high thermal insulation and moisture retention. Background technique [0002] Agricultural mulch film has strong air tightness. After mulching, it can significantly reduce the evaporation of soil water, stabilize the soil humidity, and keep it moist for a long time. After mulching, it can increase soil temperature, maintain soil moisture, maintain soil structure, prevent pests from invading crops and diseases caused by certain microorganisms, and can also reduce nutrient leaching, loss, volatilization, improve nutrient utilization, etc., and promote plant growth . The food and vegetables for more than one billion people in China are completely self-sufficient, and they can also be exported. Mulch film is indispensable. At present, more than 40 kinds of crops are covered by mulch fil...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08L69/00C08L67/04C08K13/02C08K3/22C08K5/29C08K5/20C08K5/1515C08K3/04C08K3/36B29C47/92B29C48/92
CPCB29C48/92B29C2948/9258B29C2948/92704C08J5/18C08J2367/02C08J2467/04C08J2469/00C08K2201/014C08L67/02C08L2201/06C08L2203/16C08L2205/025C08L2205/035C08L69/00C08L67/04C08K13/02C08K2003/2296C08K5/29C08K5/20C08K2003/2241C08K5/1515C08K3/04C08K3/36
Inventor 尹继磊钱志国陈宇钱毅朱郎晖陈健孙洁郭雪山刘威竺朝山金燕东王利新王海强宋佳杜强
Owner BEIJING CO FOUND HIGH TECH INCUBATOR
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