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A biodegradable poly(4-hydroxybutyrate) agricultural mulch film and its preparation method

A technology of hydroxybutyrate and agricultural mulching film, which is applied in botany equipment and methods, application, plant protection, etc., can solve the problems of complex biological fermentation process, difficult product purification, poor stability, etc., and achieve cost reduction and degradation cycle , the strength and toughness are close, and the effect of large inflation ratio

Active Publication Date: 2022-02-22
QINGDAO UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Tepha Company of the United States took the lead in realizing the large-scale production of P4HB through the biological fermentation method, but the biological fermentation method has the disadvantages of complicated process, high cost, difficult purification of the obtained product, and poor stability.

Method used

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  • A biodegradable poly(4-hydroxybutyrate) agricultural mulch film and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A biodegradable P4HB agricultural mulch film is made of the following raw materials in parts by weight:

[0037] 80 parts of P4HB (molecular weight 100,000, melt index 5.7), 10 parts of light calcium carbonate, 1 part of TMC200, 2 parts of nano-titanium dioxide, 1 part of antioxidant 1076, 2 parts of ADR-4468, 3 parts of PEG-4000, titanic acid 1 part of ester coupling agent.

[0038] The preparation method of above-mentioned biodegradable P4HB agricultural mulch film, comprises the following steps:

[0039] Step 1. Weigh a small amount of P4HB, light calcium carbonate, PEG-4000, titanate coupling agent, and antioxidant 1076 according to the formula and put them into a high-speed mixer, stir and blend evenly, and the obtained blend is extruded by a twin-screw Exit the machine to prepare filler masterbatch. The processing temperature of the twin-screw extruder is 80°C, 100°C, 100°C, 120°C, 120°C, 120°C, 100°C, the screw speed is 150rpm, the screw combination is high she...

Embodiment 2

[0043] A biodegradable P4HB agricultural mulch film is made of the following raw materials in parts by weight:

[0044] P4HB (molecular weight 120,000, melt index 4.3) 75 parts, chitosan 15 parts, talc powder 3 parts, nano titanium dioxide 2 parts, antioxidant 1076 1 part, ADR-4468 2 parts, silane coupling agent KH550 1 part, 1 part of antibacterial masterbatch.

[0045] The preparation method of above-mentioned biodegradable P4HB agricultural mulch film, comprises the following steps:

[0046] Step 1. Weigh a small amount of P4HB, chitosan, KH550, and antioxidant 1076 according to the formula and put them into a high-speed mixer, stir and blend evenly, and prepare the filled masterbatch from the obtained blend through a twin-screw extruder. The processing temperature of the twin-screw extruder is 80°C, 100°C, 100°C, 120°C, 120°C, 120°C, 100°C, the screw speed is 200rpm, the screw combination is high shear, and the cooling water temperature is 7°C.

[0047] Step 2. Weigh P4H...

Embodiment 3

[0050] A biodegradable P4HB agricultural mulch film is made of the following raw materials in parts by weight:

[0051] 80 parts of P4HB (molecular weight 150,000, melt index 3.5), 10 parts of cellulose, 1 part of ethylene bisstearamide, 2 parts of zinc oxide, 1 part of antioxidant 1076, 2 parts of ADR-4468, 1 part of maleic anhydride , 3 parts of weeding masterbatch.

[0052] The preparation method of above-mentioned biodegradable P4HB agricultural mulch film, comprises the following steps:

[0053] Step 1. Weigh a small amount of P4HB, cellulose, maleic anhydride, and antioxidant 1076 according to the formula and put them into a high-speed mixer, stir and blend evenly, and prepare the filled masterbatch from the obtained blend through a twin-screw extruder. The processing temperature of the twin-screw extruder is 80°C, 100°C, 100°C, 120°C, 120°C, 120°C, 100°C, the screw speed is 150rpm, the screw combination is high shear, and the cooling water temperature is 7°C.

[0054]...

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Abstract

The invention belongs to the technical field of preparation of degradable agricultural mulch, and provides a method for preparing high-strength, functional and biodegradable agricultural mulch with low energy consumption and low cost. It solves the technical problems of poor film-forming property, uncontrollable degradation cycle, poor film performance and high cost in the preparation of agricultural mulch film from existing biodegradable materials. The raw materials used in the present invention are: 70-90 parts of poly(4-hydroxybutyrate) (P4HB), 0-15 parts of filler, 0.3-3 parts of nucleating agent, 0.5-3 parts of light stabilizer, antioxidant 0.5-2 parts, chain extender 0.5-8 parts, compatibilizer 1-5 parts, functional masterbatch 0-10 parts. At the same time, P4HB blown mulch film is prepared by adopting appropriate process temperature and shear conditions. The P4HB agricultural mulch film has the advantages of adjustable degradation cycle, easy processing, and low cost, and can truly replace polyolefin materials for agricultural mulch film.

Description

technical field [0001] The invention relates to the technical field of agricultural mulching films, in particular to a preparation method of biodegradable poly(4-hydroxybutyrate) agricultural mulching films. Background technique [0002] As a large agricultural country, plastic film mulching cultivation technology plays a huge role in the field of agricultural production in my country. Film mulching can not only effectively increase the ground temperature and reduce water evaporation, but also prevent soil compaction and increase crop yields, especially in areas with drought and harsh climate conditions. plays a key role. According to statistics, in 2015, the output of plastic film in my country has reached more than 2 million tons, covering an area of ​​over 400 million mu, and the usage is still increasing. For a long time, my country's agricultural mulch film is mainly ordinary polyethylene (PE) plastic film, which is difficult to recycle and cannot be degraded in the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L1/02C08L97/00C08L5/08C08L3/02C08K13/02C08K3/26C08K3/22C08K5/20C08K5/25C08J5/18A01G13/02
CPCC08J5/18A01G13/0275C08J2367/04C08J2401/02C08J2497/00C08J2405/08C08J2403/02C08K13/02C08K5/20C08K5/25C08J2300/16C08K2201/011C08K2003/2241C08K2003/2296Y02A40/28
Inventor 李志波阚泽沈勇
Owner QINGDAO UNIV OF SCI & TECH
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