CN112442263A - Preparation method of biodegradable mulching film for rice - Google Patents
Preparation method of biodegradable mulching film for rice Download PDFInfo
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- CN112442263A CN112442263A CN202011237626.6A CN202011237626A CN112442263A CN 112442263 A CN112442263 A CN 112442263A CN 202011237626 A CN202011237626 A CN 202011237626A CN 112442263 A CN112442263 A CN 112442263A
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- rice
- pvc
- mulching film
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G13/00—Protecting plants
- A01G13/02—Protective coverings for plants; Coverings for the ground; Devices for laying-out or removing coverings
- A01G13/0256—Ground coverings
- A01G13/0268—Mats or sheets, e.g. nets or fabrics
- A01G13/0275—Films
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/04—Polyesters derived from hydroxy carboxylic acids, e.g. lactones
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/49—Phosphorus-containing compounds
- C08K5/51—Phosphorus bound to oxygen
- C08K5/52—Phosphorus bound to oxygen only
- C08K5/524—Esters of phosphorous acids, e.g. of H3PO3
- C08K5/526—Esters of phosphorous acids, e.g. of H3PO3 with hydroxyaryl compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/56—Organo-metallic compounds, i.e. organic compounds containing a metal-to-carbon bond
- C08K5/57—Organo-tin compounds
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/28—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture specially adapted for farming
Abstract
The invention discloses a preparation method of a biodegradable mulching film for rice, which comprises 60-80 parts of polylactic acid, 15-35 parts of a degradable master batch, 2-8 parts of a PVC smoothing agent, 1.5-6 parts of a PET hydrolysis resistant agent, 0.3-3 parts of a PVC heat stabilizer, 0.5-2 parts of a light stabilizer and 0.01-1.5 parts of an antioxidant TNP. The modified material is obtained by mixing and stirring polylactic acid and the degradation master batch and adding PVC smoothing agent, PET anti-hydrolysis agent, PVC heat stabilizer, light stabilizer and antioxidant TNP in turn. The raw materials used in the invention are all biodegradable substances, so that the environment is not polluted; the compatibility among the raw materials is good; the film has low cost and the product has low price, and all materials are not starch substances.
Description
Technical Field
The invention relates to the technical field of degradable materials, in particular to a method for manufacturing a biodegradable mulching film for rice.
Background
The agricultural mulching film has the functions of improving the ground temperature, preserving water and soil, preventing insects and inhibiting the growth of weeds, thereby increasing the yield and income of crops. However, rice is generally not planted in mulching film, and the rice planting area is affected by geographical and climatic factors. The rice planting area of our country is large, and the mulching film is popularized and used in rice planting, so that the grain yield can be effectively increased, the economic income of local farmers can be increased, and the problem of grain crisis can be solved.
However, the mulching film is widely used but is not reasonably recycled, and the residual mulching film in the farmland causes white pollution. Currently, a mulching film is generally made of polyethylene or polyvinyl chloride materials, and the mulching film remained in soil is difficult to degrade, so that soil hardening and fertility reduction are caused, water absorption and nutrient supply of the soil are hindered, crop growth is greatly influenced, the quality of agricultural products is reduced, and economic loss is caused.
Due to excellent degradability, the biodegradable film solves the problems of white pollution caused by residual mulching film and reduction of soil quality, and is an effective way for providing sustainable development of agriculture. However, the growth cycle of the rice growing in the northeast is long, the day and night temperature difference of the rice growing in the northeast is large, the environment is severe, the growth requirement of the rice in the northeast cannot be met by the common biodegradable mulching film, the rice begins to be damaged without being harvested, and the later growth of the rice is hindered. Therefore, there is a need for improvement of the prior art to solve the above technical problems.
Disclosure of Invention
The invention aims to provide a method for manufacturing a biodegradable mulching film for rice, which mainly meets the requirement of rice planting and growth in northeast regions, resists ultraviolet rays and temperature difference impact, prolongs the use time of the mulching film, ensures that the degradation starting time of the mulching film is close to the rice harvesting time, and facilitates the degradation of the mulching film and soil plowing.
In order to achieve the purpose, the invention provides the following technical scheme: the biodegradable mulching film for rice comprises polylactic acid, a degradation master batch, a PVC (polyvinyl chloride) smoothing agent, a PET (polyethylene terephthalate) hydrolysis-resistant agent, a PVC heat stabilizer, a light stabilizer and an antioxidant TNP.
Further, 60-80 parts of polylactic acid, 15-35 parts of degradable master batch, 2-8 parts of PVC smoothing agent, 1.5-6 parts of PET anti-hydrolysis agent, 0.3-3 parts of PVC heat stabilizer, 0.5-2 parts of light stabilizer and 0.01-1.5 parts of antioxidant TNP.
Furthermore, the degradable master batch is a full-biodegradable material extracted by taking marine shells, oysters and pearl shells as base materials.
Further, the PVC heat stabilizer is an organic tin stabilizer, and the light stabilizer is an ultraviolet absorbent.
Further, the first step: placing polylactic acid and the degradable master batch in a drying oven and drying at 50-75 ℃ until the moisture content is lower than 400 ppm; step two: putting the dried polylactic acid and the degraded master batch into a stirrer for low-speed stirring; sequentially adding a PVC (polyvinyl chloride) smoothing agent, a PET (polyethylene terephthalate) anti-hydrolysis agent, a PVC heat stabilizer, a light stabilizer and an antioxidant TNP (trinitrotoluene) while stirring, and feeding the uniformly mixed materials into a feed inlet of an extruder; step three: cooling the material extruded in the step two, then putting the material into a grinder for grinding, and drying the ground material in a drying oven at 50-75 ℃ until the water content is lower than 300ppm to obtain a modified material; step four: adding the dried modified material into a feeding hole of a blow molding machine, heating the modified material to a molten state at a head of the blow molding machine, filtering and removing impurities by the head, extruding the degraded mulching film from an outlet of an extruder, and winding the degraded mulching film by a winding machine for later use.
Further, the rotating speed of the stirrer in the second step is 0.5-4 r/s.
Further, the operation time of the pulverizer in the third step is 10-30 minutes.
Further, the temperature of the blow molding machine in the fourth step is 160-230 ℃.
The invention has the beneficial effects that: the PET hydrolysis resistant agent, the PVC heat stabilizer, the light stabilizer and the antioxidant TNP are effectively mixed, so that the effective time of the mulching film can be controlled; by adding the PVC smoothing agent, the friction between the mulching film and water is reduced, the mulching film is convenient to coat, dew or water drop adhesion can be effectively reduced, and the mulching film is prevented from being damaged due to focusing caused by sunlight irradiation; the mulching film is suitable for the environment with large day-night temperature difference in northeast, the film changing and supplementing frequency is reduced, and the grain yield is improved; aiming at the rice planting in northeast regions, the mulching film can meet the requirement of the growth cycle of rice, and meanwhile, the mulching film starts to decompose when the rice is about to mature, and no mulching film is left in soil when soil is ploughed, so that the next ploughing is convenient to carry out; because the mulching film is suitable for water environment, and the added anti-hydrolysis agent plays a role in water blocking due to pores, the mulching film not only has the effects of heat preservation and moisture preservation, but also can prolong the service life of the mulching film. Other benefits of this patent are further illustrated in the following examples.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A preparation method of a biodegradable mulching film for rice comprises the following components in parts by weight: 60 parts of polylactic acid, 15 parts of degraded master batch, 2 parts of PVC smoothing agent, 1.5 parts of PET anti-hydrolysis agent, 0.3 part of PVC heat stabilizer, 0.5 part of light stabilizer and 0.01 part of antioxidant TNP. The method comprises the following steps: placing polylactic acid and the degradable master batch in a drying oven and drying at 50-75 ℃ until the moisture content is lower than 400 ppm; step two: putting the dried polylactic acid and the degraded master batch into a stirrer for low-speed stirring; sequentially adding a PVC (polyvinyl chloride) smoothing agent, a PET (polyethylene terephthalate) anti-hydrolysis agent, a PVC heat stabilizer, a light stabilizer and an antioxidant TNP (trinitrotoluene) while stirring, and feeding the uniformly mixed materials into a feed inlet of an extruder; step three: cooling the material extruded in the step two, then putting the material into a grinder for grinding, and drying the ground material in a drying oven at 50-75 ℃ until the water content is lower than 300ppm to obtain a modified material; step four: adding the dried modified material into a feeding hole of a blow molding machine, heating the modified material to a molten state at a head of the blow molding machine, filtering and removing impurities by the head, extruding the degraded mulching film from an outlet of an extruder, and winding the degraded mulching film by a winding machine for later use.
Example 2
A preparation method of a biodegradable mulching film for rice comprises the following components in parts by weight: 75 parts of polylactic acid, 20 parts of degraded master batch, 6 parts of PVC smoothing agent, 4 parts of PET anti-hydrolysis agent, 1.5 parts of PVC heat stabilizer, 1 part of light stabilizer and 0.5 part of antioxidant TNP. The method comprises the following steps: placing polylactic acid and the degradable master batch in a drying oven and drying at 50-75 ℃ until the moisture content is lower than 400 ppm; step two: putting the dried polylactic acid and the degraded master batch into a stirrer for low-speed stirring; sequentially adding a PVC (polyvinyl chloride) smoothing agent, a PET (polyethylene terephthalate) anti-hydrolysis agent, a PVC heat stabilizer, a light stabilizer and an antioxidant TNP (trinitrotoluene) while stirring, and feeding the uniformly mixed materials into a feed inlet of an extruder; step three: cooling the material extruded in the step two, then putting the material into a grinder for grinding, and drying the ground material in a drying oven at 50-75 ℃ until the water content is lower than 300ppm to obtain a modified material; step four: adding the dried modified material into a feeding hole of a blow molding machine, heating the modified material to a molten state at a head of the blow molding machine, filtering and removing impurities by the head, extruding the degraded mulching film from an outlet of an extruder, and winding the degraded mulching film by a winding machine for later use.
Example 3
A preparation method of a biodegradable mulching film for rice comprises the following components in parts by weight: 80 parts of polylactic acid, 35 parts of degraded master batch, 8 parts of PVC smoothing agent, 6 parts of PET anti-hydrolysis agent, 3 parts of PVC heat stabilizer, 2 parts of light stabilizer and 1.5 parts of antioxidant TNP. The method comprises the following steps: placing polylactic acid and the degradable master batch in a drying oven and drying at 50-75 ℃ until the moisture content is lower than 400 ppm; step two: putting the dried polylactic acid and the degraded master batch into a stirrer for low-speed stirring; sequentially adding a PVC (polyvinyl chloride) smoothing agent, a PET (polyethylene terephthalate) anti-hydrolysis agent, a PVC heat stabilizer, a light stabilizer and an antioxidant TNP (trinitrotoluene) while stirring, and feeding the uniformly mixed materials into a feed inlet of an extruder; step three: cooling the material extruded in the step two, then putting the material into a grinder for grinding, and drying the ground material in a drying oven at 50-75 ℃ until the water content is lower than 300ppm to obtain a modified material; step four: adding the dried modified material into a feeding hole of a blow molding machine, heating the modified material to a molten state at a head of the blow molding machine, filtering and removing impurities by the head, extruding the degraded mulching film from an outlet of an extruder, and winding the degraded mulching film by a winding machine for later use.
| Examples | 1 | 2 | 3 |
| Degradation period (moon) | 3.5 | 6 | 7.5 |
| Suitable area | Coastal region of southeast | Middle region | Northeast region |
According to the three embodiments, the mulching film can be suitable and popularized for rice planting in different areas, the using time of the mulching film can be adjusted according to local conditions, the component proportion of the mulching film can be adjusted, the requirement of the rice growth cycle in different areas can be met, the mulching film breakage time is not less than 105 days, the mulching film is less damaged midway, the strong wind resistance and the temperature difference resistance are good, and the yield per mu of rice is improved. After the rice is harvested, residual mulching films do not need to be recycled, soil turning is not affected, and manpower and material resources are saved.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, the present invention is described in detail with reference to the preferred embodiments, and it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (8)
1. A biodegradable plastic film for rice is characterized in that: the biodegradable mulching film for rice comprises polylactic acid, a degradation master batch, a PVC (polyvinyl chloride) smoothing agent, a PET (polyethylene terephthalate) hydrolysis-resistant agent, a PVC heat stabilizer, a light stabilizer and an antioxidant TNP.
2. The biodegradable plastic film for rice as claimed in claim 1, wherein: 60-80 parts of polylactic acid, 15-35 parts of degradable master batch, 2-8 parts of PVC smoothing agent, 1.5-6 parts of PET anti-hydrolysis agent, 0.3-3 parts of PVC heat stabilizer, 0.5-2 parts of light stabilizer and 0.01-1.5 parts of antioxidant TNP.
3. The biodegradable plastic film for rice as claimed in claim 2, wherein: the degradable master batch is a full-biodegradable material extracted by taking marine shells, oysters and pearl shells as base materials.
4. The biodegradable plastic film for rice as claimed in claim 3, wherein: the PVC heat stabilizer is an organic tin stabilizer, and the light stabilizer is an ultraviolet absorbent.
5. A method for preparing the biodegradable mulching film for rice as claimed in any one of claim 4, wherein:
the method comprises the following steps: placing polylactic acid and the degradable master batch in a drying oven and drying at 50-75 ℃ until the moisture content is lower than 400 ppm;
step two: putting the dried polylactic acid and the degraded master batch into a stirrer for low-speed stirring; sequentially adding a PVC (polyvinyl chloride) smoothing agent, a PET (polyethylene terephthalate) anti-hydrolysis agent, a PVC heat stabilizer, a light stabilizer and an antioxidant TNP (trinitrotoluene) while stirring, and feeding the uniformly mixed materials into a feed inlet of an extruder;
step three: cooling the material extruded in the step two, then putting the material into a grinder for grinding, and drying the ground material in a drying oven at 50-75 ℃ until the water content is lower than 300ppm to obtain a modified material;
step four: adding the dried modified material into a feeding hole of a blow molding machine, heating the modified material to a molten state at a head of the blow molding machine, filtering and removing impurities by the head, extruding the degraded mulching film from an outlet of an extruder, and winding the degraded mulching film by a winding machine for later use.
6. The method for manufacturing the biodegradable plastic film for rice as claimed in claim 5, wherein: and in the second step, the rotating speed of the stirrer is 0.5-4 r/s.
7. The method for manufacturing the biodegradable plastic film for rice as claimed in claim 6, wherein: the operation time of the pulverizer in the third step is 10-30 minutes.
8. The method for manufacturing the biodegradable plastic film for rice as claimed in claim 7, wherein: the temperature of the blow molding machine in the fourth step is 160-230 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011237626.6A CN112442263A (en) | 2020-11-09 | 2020-11-09 | Preparation method of biodegradable mulching film for rice |
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| CN202011237626.6A CN112442263A (en) | 2020-11-09 | 2020-11-09 | Preparation method of biodegradable mulching film for rice |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116239874A (en) * | 2023-02-24 | 2023-06-09 | 大禾科技发展(南京)有限公司 | Special hydrophobic biodegradable agricultural mulching film for rice as well as preparation method and application thereof |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19951021A1 (en) * | 1998-12-15 | 2000-06-21 | Wolff Walsrode Ag | Biodegradable, thermoplastic moldings with improved hydrolysis stability and stress crack resistance |
| CN102070880A (en) * | 2010-12-24 | 2011-05-25 | 金发科技股份有限公司 | Biodegradable resin composition and product thereof |
| CN103030939A (en) * | 2011-09-29 | 2013-04-10 | 上海林静医疗器械有限公司 | Disposable medical apparatus and instrument prepared by degradable substrate and method |
| CN103665784A (en) * | 2013-11-27 | 2014-03-26 | 山东农业大学 | Novel controllable biodegradable agricultural mulching film |
| JP2015174926A (en) * | 2014-03-17 | 2015-10-05 | ユニチカ株式会社 | polylactic acid-based resin sheet |
| CN105623214A (en) * | 2016-01-13 | 2016-06-01 | 广州市海珥玛植物油脂有限公司 | Plasticized biodegradable polyester film and preparation method thereof |
| CN106633704A (en) * | 2017-01-06 | 2017-05-10 | 白山市喜丰塑业有限公司 | Full-biodegradation mulch film for rice planting and production method thereof |
| CN110330773A (en) * | 2019-07-19 | 2019-10-15 | 深圳利琒环保材料有限公司 | A kind of controllable full-biodegradable mulch and preparation method thereof |
| CN110591316A (en) * | 2019-09-26 | 2019-12-20 | 深圳市氩氪新材料技术研究服务有限公司 | Shell powder modified polylactic acid composite material and preparation method and application thereof |
-
2020
- 2020-11-09 CN CN202011237626.6A patent/CN112442263A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19951021A1 (en) * | 1998-12-15 | 2000-06-21 | Wolff Walsrode Ag | Biodegradable, thermoplastic moldings with improved hydrolysis stability and stress crack resistance |
| CN102070880A (en) * | 2010-12-24 | 2011-05-25 | 金发科技股份有限公司 | Biodegradable resin composition and product thereof |
| CN103030939A (en) * | 2011-09-29 | 2013-04-10 | 上海林静医疗器械有限公司 | Disposable medical apparatus and instrument prepared by degradable substrate and method |
| CN103665784A (en) * | 2013-11-27 | 2014-03-26 | 山东农业大学 | Novel controllable biodegradable agricultural mulching film |
| JP2015174926A (en) * | 2014-03-17 | 2015-10-05 | ユニチカ株式会社 | polylactic acid-based resin sheet |
| CN105623214A (en) * | 2016-01-13 | 2016-06-01 | 广州市海珥玛植物油脂有限公司 | Plasticized biodegradable polyester film and preparation method thereof |
| CN106633704A (en) * | 2017-01-06 | 2017-05-10 | 白山市喜丰塑业有限公司 | Full-biodegradation mulch film for rice planting and production method thereof |
| CN110330773A (en) * | 2019-07-19 | 2019-10-15 | 深圳利琒环保材料有限公司 | A kind of controllable full-biodegradable mulch and preparation method thereof |
| CN110591316A (en) * | 2019-09-26 | 2019-12-20 | 深圳市氩氪新材料技术研究服务有限公司 | Shell powder modified polylactic acid composite material and preparation method and application thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116239874A (en) * | 2023-02-24 | 2023-06-09 | 大禾科技发展(南京)有限公司 | Special hydrophobic biodegradable agricultural mulching film for rice as well as preparation method and application thereof |
| CN116239874B (en) * | 2023-02-24 | 2024-01-23 | 大禾科技发展(南京)有限公司 | Special hydrophobic biodegradable agricultural mulching film for rice as well as preparation method and application thereof |
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Application publication date: 20210305 |