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Fully biodegradable multifunctional mulch film and preparation method thereof
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A biodegradable and multifunctional technology, applied in the field of multifunctional plastic film, can solve the problems of no slow release function, increased cost, poor compatibility, etc.
Active Publication Date: 2015-09-23
ANHUI XUELANG BIOTECHNOLOGY CO LTD
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Problems solved by technology
However, the multifunctional plastic film obtained by this method uses a photodegradant to decompose the plastic film into fragments and cannot continue to decompose after entering the soil, which will pollute the soil
Secondly, since micro-fertilizers are inorganic salts and have poor compatibility with polyethylene, it is necessary to use polyvinyl alcohol aqueous solution as an adhesive to coat additives such as herbicides and micro-fertilizers on the film, which requires additional drying processes, complicated operations, and high costs. Increase
In addition, due to the water solubility of polyvinyl alcohol, the additive will be transferred to the soil at one time and does not have a slow-release function
Method used
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Embodiment 1
[0054] Example 1: Preparation of co-plasticizer glyceryl malate (DGMA)
[0055] Put 3.0kg of malic acid and 4.0kg of glycerin in a 10L reactor equipped with a water separator, and pass N 2 Stir and react at 130-140°C for 15 hours, separate out the produced water, stop the reaction when the acid value is less than 3%, and obtain a colorless and transparent viscous liquid DGMA.
Embodiment 2
[0056] Example 2: Preparation of compatibilizer polyglyceryl sebacate (PGS)
[0057] 4.12kg sebacic acid, 1.84kg glycerin are placed in the 10L reactor that water separator is equipped with, logical N 2 Stir and react at 140-160° C. for 24 hours, and react under vacuum for 8 hours to obtain a PGS resin with a number average molecular weight of 10,200, a weight average molecular weight of 44,000, and a dispersion degree of 4.31.
Embodiment 3
[0059] Corn starch 7.0kg, urea 4.0kg, DGMA 0.5kg prepared in Example 1, glycerin 0.5kg, PGS 1.0kg prepared in Example 2, potassium dihydrogen phosphate (100 mesh) 1.0kg, oleic acid amide 0.1kg, PBAT6 .0kg, PBS6.0kg mixed evenly, blended and extruded in ZSK-58 twin-screw extruder (L / D=48), the temperature of each zone is 100°C / 140°C / 165°C / 180°C / 165°C / 150°C, Remove water by vacuum, extrude, cool with water, dry, and pelletize to obtain starch-based resin containing nitrogen, phosphorus and potassium nutrients. The obtained particles are processed into a film with a film blowing equipment with a 65mm die opening, and the film blowing machine L / D=30. The temperature in each zone is 90°C / 120°C / 135°C / 150°C / 150°C, the obtained film thickness is 0.010mm, the starch phase is evenly distributed, the processability and film-forming performance are good, the tensile strength is 18MPa, and the elongation is 370%. Each kilogram of film contains: nitrogen (calculated as urea) 15.5%; phospho...
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PUM
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Abstract
The present invention provides fully biodegradable and multi-functional plastic mulch. The plastic mulch comprises, by weight percent: natural biopolymers of starch or derivatives thereof, biodegradable synthetic polymers, an interfacial reinforcer, a compound plasticizer with urea as a main ingredient, a nitrogen phosphorus and potassium compound fertilizer, pesticides, herbicides and trace fertilizers. The plastic mulch of the present invention not only has heat and moisture preservation functions, and is fully biodegradable after use, eliminating the contamination to soil causes by residual plastic mulch debris; and functional additives of fertilizers and nutrients, pesticides, herbicides etc. in the plastic mulch are sustainedly released as the plastic munch degrading, so the plastic mulch has long lasting effects of weed controlling, pest killing, and sustainedly released fertilizing, significantly reducing the use amount of fertilizers and pesticides, decreasing costs, and protecting the ecological environment. The invention also provides a method for preparing the multi-functional plastic mulch.
Description
technical field [0001] The invention relates to a plastic film, in particular to a degradable multifunctional plastic film and a preparation method thereof. Background technique [0002] Because mulch can increase soil temperature, maintain soil moisture, maintain soil structure, prevent pests from invading crops and diseases caused by certain microorganisms, and promote plant growth, it has been widely used in grain, cotton, oil, vegetables, melons, tobacco, More than 40 kinds of crops such as sugar, medicine, hemp, tea, and forests have generally increased the yield of crops by 10% to 50%, which has brought about changes in agricultural production methods and has been called the "White Revolution." [0003] However, due to the good stability of plastics, especially the use of a large amount of ultra-thin mulch, it is difficult to degrade after the film is broken into the soil for hundreds of years. A large amount of accumulation seriously affects the development of plant r...
Claims
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Application Information
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