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A kind of biodegradable agricultural mulch film and preparation method thereof

An agricultural mulch film and biodegradable technology, applied in the field of film materials, can solve problems such as low mechanical strength, poor moisturizing performance, and development obstacles, and achieve the effect of improving mechanical strength and moisturizing performance

Active Publication Date: 2018-06-29
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing biodegradable mulch materials have the problems of low mechanical strength and poor moisture retention performance, which hinders their development in the field of agricultural mulch films.

Method used

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  • A kind of biodegradable agricultural mulch film and preparation method thereof
  • A kind of biodegradable agricultural mulch film and preparation method thereof
  • A kind of biodegradable agricultural mulch film and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0063] The invention provides a method for preparing a biodegradable agricultural mulch film, comprising the following steps:

[0064] The raw materials are sequentially melt blended, granulated and blow molded to obtain a biodegradable agricultural mulch film;

[0065] The raw materials include 20-80 parts by weight of ultra-high molecular weight polypropylene carbonate, 15-75 parts by weight of high-molecular-weight polyester, 0.2-1.5 parts by weight of chain extender and 2-25 parts by weight of nano-fillers with lamellar structure;

[0066] The number-average molecular weight of described ultra-high molecular weight polypropylene carbonate ≥ 300kDa; Described high molecular weight polyester comprises poly(butylene adipate-butylene terephthalate) and / or carbon dioxide-based poly( Carbonate-ether) type polyurethane; the number average molecular weight of the high molecular weight polyester is 80-150kDa.

[0067] In the preparation method provided by the invention, the raw ma...

Embodiment 1

[0076] Preparation of Carbon Dioxide Based Poly(carbonate-ether) Polyurethane

[0077] Add 32kg of propylene oxide, 50g of Co-Zn double metal cyanide as a catalyst, and 0.9L of dry polypropylene glycol with a molar mass of 350g / mol to the dry polymerization reactor under the protection of nitrogen, stir for 1h, pressurize the carbon dioxide to 5MPa, and raise the temperature to 75°C, react for 6 hours, precipitate the reaction product, and obtain carbon dioxide-based poly(carbonate-ether) glycol after separation.

[0078] Using gel permeation chromatography (GPC) analysis, polymer molecular weight 2200Da, using hydrogen nuclear magnetic resonance spectrum analysis (H 1 -NMR) copolymer ether segment content 25%.

[0079] Add 70mol of terephthalic acid, 30mol of adipic acid, 100mol of butanediol and 9g of tetrabutyl titanate into a 50L polymerization reactor, under nitrogen protection, and react at 235°C. When the water output reaches the theoretical water output, the temperatu...

Embodiment 2

[0082] Preparation of agricultural mulch

[0083] 20 parts by weight of PPC (number average molecular weight 320kDa, weight average molecular weight 950kDa), 70 parts by weight of PBAT (number average molecular weight 85kDa, weight average molecular weight 162kDa), 0.2 parts by weight of free radical scavenger UV-622, 0.3 parts by weight of ultraviolet absorber UV-571, 0.5 parts by weight of BASF epoxy chain extender ADR-4370, 0.3 parts by weight of erucamide and 8.7 parts by weight of nano-montmorillonite (diameter-thickness ratio: 130, thickness: 30nm) are mixed in a mixer Uniform, granulate with twin-screw extruder at 120°C-180°C, after cooling and drying, use conventional single-screw film blowing equipment to blow a film with a thickness of 0.006mm at 100°C-150°C.

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Abstract

The invention belongs to the field of film materials, and in particular relates to a biodegradable agricultural mulch film and a preparation method thereof. The biodegradable agricultural mulching film provided by the present invention is made of raw materials comprising the following components in parts by weight: 20-80 parts of ultra-high molecular weight polypropylene carbonate; 15-75 parts of high-molecular weight polyester; 0.2-1.5 parts of chain extender; 2 to 25 parts of sheet-structure nanofillers; the number-average molecular weight of the ultra-high molecular weight polypropylene carbonate is more than or equal to 300kDa; the high molecular weight polyester includes poly(butylene adipate-butylene terephthalate) alcohol ester) and / or carbon dioxide-based poly(carbonate-ether) polyurethane; the number average molecular weight of the high molecular weight polyester is 80kDa~200kDa. The invention uses ultra-high molecular weight polypropylene carbonate, high molecular weight polyester, chain extender and lamellar structure nano filler as raw materials, and improves the mechanical strength and moisture retention performance of the film through the synergistic effect of the raw materials.

Description

technical field [0001] The invention belongs to the field of film materials, and in particular relates to a biodegradable agricultural mulch film and a preparation method thereof. Background technique [0002] Agricultural mulch film can not only increase soil temperature, maintain soil moisture, maintain soil structure, but also play a role in insect control and weeding, and increase crop yield. It is an indispensable key material for modern agriculture. It was once considered a white revolution in agriculture. Since 1978, the application of mulch film in my country has made great progress. In 2013, the national agricultural mulch film coverage area reached 380 million mu, and the consumption was as high as 1.3 million tons, which has made great contributions to solving my country's food self-sufficiency and vegetable supply. It is predicted that in the next 10 years, the amount of mulch film in my country will increase by about 10%, and the future coverage area is expected...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/02C08L69/00C08L75/08C08K13/02C08K3/34C08K5/20C08K5/09A01G13/02
CPCA01G13/0275C08J5/18C08J2367/02C08J2369/00C08J2375/08C08J2469/00C08J2475/08C08K2201/011C08L67/02C08L69/00C08L75/08C08L2201/06C08L2203/16C08L2205/03C08K13/02C08K3/346C08K5/20C08K3/34C08K5/09Y02A40/28
Inventor 周庆海高凤翔王献红王佛松
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI