CN115044255A - Liquid mulching film and preparation method thereof - Google Patents
Liquid mulching film and preparation method thereof Download PDFInfo
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- CN115044255A CN115044255A CN202210561212.1A CN202210561212A CN115044255A CN 115044255 A CN115044255 A CN 115044255A CN 202210561212 A CN202210561212 A CN 202210561212A CN 115044255 A CN115044255 A CN 115044255A
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- 239000007788 liquid Substances 0.000 title claims abstract description 50
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims abstract description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000011159 matrix material Substances 0.000 claims abstract description 20
- 239000002994 raw material Substances 0.000 claims abstract description 16
- 229920002472 Starch Polymers 0.000 claims abstract description 13
- 235000019698 starch Nutrition 0.000 claims abstract description 13
- 239000008107 starch Substances 0.000 claims abstract description 13
- 239000000853 adhesive Substances 0.000 claims abstract description 7
- 230000001070 adhesive effect Effects 0.000 claims abstract description 7
- 239000006184 cosolvent Substances 0.000 claims abstract description 7
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 7
- 239000004094 surface-active agent Substances 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims description 44
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 31
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 24
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical group [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 22
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 22
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 22
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 13
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 13
- 235000011187 glycerol Nutrition 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 12
- 229920002401 polyacrylamide Polymers 0.000 claims description 12
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical group O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 239000002002 slurry Substances 0.000 claims description 11
- 235000010482 polyoxyethylene sorbitan monooleate Nutrition 0.000 claims description 9
- 229920000053 polysorbate 80 Polymers 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 8
- 238000005303 weighing Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 235000011837 pasties Nutrition 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 4
- 239000002689 soil Substances 0.000 abstract description 19
- 238000004321 preservation Methods 0.000 abstract description 13
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 9
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 9
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 7
- 229920002678 cellulose Polymers 0.000 description 6
- 239000001913 cellulose Substances 0.000 description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 125000002057 carboxymethyl group Chemical group [H]OC(=O)C([H])([H])[*] 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 239000000017 hydrogel Substances 0.000 description 3
- 238000012271 agricultural production Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 238000005411 Van der Waals force Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 229920005551 calcium lignosulfonate Polymers 0.000 description 1
- RYAGRZNBULDMBW-UHFFFAOYSA-L calcium;3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfonatopropyl)phenoxy]propane-1-sulfonate Chemical compound [Ca+2].COC1=CC=CC(CC(CS([O-])(=O)=O)OC=2C(=CC(CCCS([O-])(=O)=O)=CC=2)OC)=C1O RYAGRZNBULDMBW-UHFFFAOYSA-L 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000012295 chemical reaction liquid Substances 0.000 description 1
- FOCAUTSVDIKZOP-UHFFFAOYSA-N chloroacetic acid Chemical compound OC(=O)CCl FOCAUTSVDIKZOP-UHFFFAOYSA-N 0.000 description 1
- 229940106681 chloroacetic acid Drugs 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 238000009313 farming Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920006254 polymer film Polymers 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D101/00—Coating compositions based on cellulose, modified cellulose, or cellulose derivatives
- C09D101/08—Cellulose derivatives
- C09D101/26—Cellulose ethers
- C09D101/28—Alkyl ethers
- C09D101/286—Alkyl ethers substituted with acid radicals
-
- 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
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/52—Mulches
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/06—Biodegradable
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2101/00—Agricultural use
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Environmental Sciences (AREA)
- Inorganic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- General Health & Medical Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Biological Depolymerization Polymers (AREA)
- Protection Of Plants (AREA)
Abstract
The invention discloses a liquid mulching film, which comprises the following raw materials: 7-15 parts of matrix, 17.5-37.5 parts of cosolvent, 0.125-0.655 part of film-forming assistant, 0.081-0.099 part of adhesive, 0.021-0.051 part of cross-linking agent, 0.0071-0.0091 part of soluble starch, 0.0070-0.0099 parts of surfactant, 0.030-0.039 part of glycerol and the balance of water. By adopting the liquid mulching film and the preparation method thereof, the prepared mulching film has short film forming time, long film maintaining time, better heat preservation and soil moisture preservation functions and biodegradability, simple preparation method, low price of raw materials, no harm to human body and no pollution to environment, and really realizes an environment-friendly product.
Description
Technical Field
The invention relates to the technical field of mulching films for agriculture, in particular to a liquid mulching film and a preparation method thereof.
Background
The mulching film is one of important material data in agricultural production, has the functions of increasing temperature, preserving soil moisture, inhibiting weeds and the like, greatly improves the crop yield in China, and drives the change of agricultural production modes in China and the rapid development of agricultural productivity. Data from the national statistical bureau show that in 2018, the usage amount of agricultural films in China reaches 246.5 million tons, wherein the usage amount of the mulching films is 140.4 million tons, the coverage area is 2.66 hundred million acres, and the coverage areas of the agricultural films exceed 1000 million acres in 9 provinces such as Xinjiang, Shandong, inner Mongolia, Gansu, Yunnan, Henan, Sichuan, Hebei, Hunan and the like, so that the mulching films are widely applied to the whole country. However, the common plastic mulching film takes high molecular compounds such as polyethylene and the like as raw materials, and is difficult to degrade under natural conditions. With the increasing of the input amount and the service life of the mulching films and the lack of effective treatment measures, the number of waste mulching films in farmland soil increases year by year, and the pollution is continuously aggravated. A large amount of mulching film remains in the soil, destroys the soil structure, causes deterioration of the cultivated land quality, crop reduction and obstruction of the farming operation, and presents a gradually aggravated situation.
The liquid mulching film covering technology has been in the history of decades in China, and the degradability and the versatility of the liquid mulching film covering technology make the liquid mulching film covering technology increasingly receive attention of people, but the existing liquid mulching film products in the market still have many defects. 1. The liquid mulching film has poor film forming effect and insufficient heat preservation and water retention capacity on soil. 2. The liquid mulching film can not be fully dissolved, the formed undissolved small particles easily block the spray head, and the spray head is difficult to clean, so that time and labor are wasted, and the practical application is difficult to realize. 3. Poor freezing resistance, low-temperature changeability failure and incapability of use, and seriously limits the production, storage and transportation of products. 4. The liquid mulching film contains strong acid or strong base, so that the pH value of soil is easy to change after the liquid mulching film is applied, the liquid mulching film is not beneficial to the growth of crops, and secondary pollution is easy to cause. 5. The preparation method of part of liquid mulching films is complicated, time-consuming and labor-consuming, complex in formula and high in cost, and is not beneficial to practical production and application.
Disclosure of Invention
The invention aims to provide a liquid mulching film and a preparation method thereof, the prepared mulching film has short film forming time, long film maintaining time, better heat preservation and soil moisture preservation functions and biodegradability, simple preparation method, low price of raw materials, no harm to human bodies and no pollution to the environment, and really achieves an environment-friendly product.
In order to achieve the aim, the invention provides a liquid mulching film, which comprises the following raw materials: 7-15 parts of matrix, 17.5-37.5 parts of cosolvent, 0.125-0.655 part of film-forming assistant, 0.081-0.099 part of adhesive, 0.021-0.051 part of cross-linking agent, 0.0071-0.0091 part of soluble starch, 0.0070-0.0099 parts of surfactant, 0.030-0.039 part of glycerol and the balance of water.
Preferably, the matrix is sodium carboxymethyl cellulose.
Preferably, the cosolvent is 95% ethanol.
Preferably, the film forming aid is polyvinyl alcohol.
Preferably, the adhesive is silica sol with the grain diameter less than or equal to 30 nm.
Preferably, the cross-linking agent is polyacrylamide.
Preferably, the surfactant is tween-80.
Preferably, the liquid mulching film comprises the following raw materials: by weight, 10.5 parts of sodium carboxymethylcellulose, 26.25 parts of ethanol, 0.125 part of polyvinyl alcohol, 0.096 part of silica sol, 0.025 part of polyacrylamide, 0.0083 part of soluble starch, 0.0084 part of tween-80, 0.032 part of glycerol and the balance of water.
A preparation method of a liquid mulching film comprises the following steps:
s1, weighing sodium carboxymethylcellulose, placing the sodium carboxymethylcellulose in a drying container, adding ethanol, stirring for 10min to enable the sodium carboxymethylcellulose to be flocculent and serve as matrix slurry, adding 50% of water into a reaction kettle with a stirring paddle, heating in a water bath and continuously stirring at the stirring speed of 200r/min, adding a small amount of matrix slurry for multiple times in the stirring process, and stirring until the matrix slurry is pasty for at least 0.5 h;
s2, adding the rest 50% of water into the reaction kettle, adding polyvinyl alcohol and silica sol after the temperature in the reaction solution rises to 40 ℃, heating to 60 ℃, stirring for 2 hours, and naturally cooling to below 40 ℃;
and S3, adding polyacrylamide, soluble starch, tween-80 and glycerol into the mixed system, heating to 80 ℃, rapidly stirring for 5min at the stirring speed of 600r/min, adjusting the stirring speed to 100r/min, stirring for 25min, naturally cooling to 40 ℃, and discharging to a sealed tank to obtain the degradable liquid mulching film.
The liquid mulching film provided by the invention adopts sodium carboxymethyl cellulose (CMC) as a main matrix, the sodium carboxymethyl cellulose is a carboxymethylated derivative of cellulose, is also called cellulose gum, has the characteristics of high transparency, strong hydrophilicity, good solution stability and the like, and has a certain water retention property. The liquid mulching film prepared by the invention has short film forming time, long film maintaining time, better heat preservation and soil moisture preservation functions and biodegradability. The liquid mulching film provided by the invention is simple in preparation method, low in raw material price, harmless to human bodies and free of pollution to the environment, and really achieves an environment-friendly product.
The liquid mulching film provided by the invention adopts sodium carboxymethyl cellulose (CMC) as a main matrix, wherein the CMC is carboxymethyl derivative of cellulose, also called cellulose gum, and is an anionic high molecular compound prepared by reacting natural cellulose with sodium hydroxide and chloroacetic acid. The structural formula of the cellulose D-anhydroglucose hydrogel is similar to that of natural fibers, hydrogen atoms on hydroxyl (-OH) on a cellulose D-anhydroglucose link are replaced by carboxymethyl (-CH2COONa), CMC is very easy to combine with water due to the existence of a hydrophilic group carboxymethyl, and high molecular polymers are mutually staggered to form a network structure under the action of hydrogen bonds and van der Waals force, so that the cellulose D-anhydroglucose hydrogel can be combined with a large amount of water to form hydrogel. After the CMC is prepared into the liquid mulching film and sprayed into soil, the water can be fixed in the self-formed polymer film by combining with the water in the soil, so that the water is prevented from evaporating and losing water, and the water can be released into the soil again along with the degradation of the CMC by microorganisms. The liquid mulching film prepared by the invention has short film forming time, long film maintaining time, better heat preservation and soil moisture preservation functions and biodegradability. The preparation method is simple, the raw materials are low in price, and the product is harmless to human bodies and free of pollution to the environment, and really achieves an environment-friendly product. The structural formula of sodium carboxymethylcellulose (CMC) is as follows:
therefore, by adopting the liquid mulching film and the preparation method thereof, the prepared mulching film has short film forming time, long film maintaining time, better heat preservation and soil moisture preservation functions and biodegradability, simple preparation method, low price of raw materials, no harm to human bodies and no pollution to the environment, and really achieves an environment-friendly product.
The technical solution of the present invention is further described in detail by the following examples.
Detailed Description
The invention provides a liquid mulching film, which comprises the following raw materials: 7-15 parts of matrix, 17.5-37.5 parts of cosolvent, 0.125-0.655 part of film-forming assistant, 0.081-0.099 part of adhesive, 0.021-0.051 part of cross-linking agent, 0.0071-0.0091 part of soluble starch, 0.0070-0.0099 parts of surfactant, 0.030-0.039 part of glycerol and the balance of water.
The matrix is sodium carboxymethyl cellulose. The cosolvent is 95% ethanol. The film-forming assistant is polyvinyl alcohol. The adhesive is silica sol with the grain diameter less than or equal to 30 nm. The cross-linking agent is polyacrylamide. The surfactant is Tween-80.
The preparation method of the liquid mulching film comprises the following steps:
s1, weighing sodium carboxymethylcellulose, placing the sodium carboxymethylcellulose in a drying container, adding ethanol, stirring for 10min to enable the sodium carboxymethylcellulose to be flocculent and serve as matrix slurry, adding 50% of water into a reaction kettle with a stirring paddle, heating in a water bath and continuously stirring at the stirring speed of 200r/min, adding a small amount of matrix slurry for multiple times in the stirring process, and stirring until the matrix slurry is pasty for at least 0.5 h;
s2, adding the rest 50% of water into the reaction kettle, adding polyvinyl alcohol and silica sol after the temperature in the reaction solution rises to 40 ℃, heating to 60 ℃, stirring for 2 hours, and naturally cooling to below 40 ℃;
and S3, adding polyacrylamide, soluble starch, tween-80 and glycerol into the mixed system, heating to 80 ℃, rapidly stirring for 5min at the stirring speed of 600r/min, adjusting the stirring speed to 100r/min, stirring for 25min, naturally cooling to 40 ℃, and discharging to a sealed tank to obtain the degradable liquid mulching film.
The technical solution of the present invention is further illustrated by the following examples.
Example 1
A liquid mulching film comprises the following raw materials: by weight, 10.5 parts of sodium carboxymethylcellulose, 26.2 parts of ethanol, 0.125 part of polyvinyl alcohol, 0.096 part of silica sol, 0.025 part of polyacrylamide, 0.0083 part of soluble starch, tween-800.0084 parts, 0.032 part of glycerol and 600 parts of water.
The preparation method comprises the following steps:
(1) weighing sodium carboxymethylcellulose into a drying container, adding ethanol, and stirring for 10min to obtain flocculent matrix slurry. Adding 300 parts of water into a reaction kettle with a stirring paddle, heating in a water bath and continuously stirring, wherein the stirring speed is 200r/min, adding a small amount of matrix slurry for multiple times in the stirring process, and stirring until the mixture is pasty for at least 0.5 h;
(2) adding the rest 300 parts of water into the reaction kettle, adding polyvinyl alcohol and silica sol after the temperature in the reaction liquid rises to 40 ℃, heating to 60 ℃, stirring for 2 hours, and naturally cooling to below 40 ℃;
(3) and adding polyacrylamide, soluble starch, tween-80 and glycerol into the mixed system, heating to 80 ℃, quickly stirring for 5min at the stirring speed of 600r/min, then adjusting the stirring speed to 100r/min, stirring for 25min, naturally cooling to 40 ℃, and discharging to a sealed tank to obtain the degradable liquid mulching film.
Example 2
A liquid mulching film comprises the following raw materials: by weight, 7 parts of sodium carboxymethylcellulose, 17.5 parts of ethanol, 0.125 part of polyvinyl alcohol, 0.096 part of silica sol, 0.025 part of polyacrylamide, 0.0083 part of soluble starch, 0.032 part of tween-800.0084, 0.032 part of glycerol and 600 parts of water.
The preparation method is the same as example 1.
Example 3:
a liquid mulching film comprises the following raw materials: by weight, 15 parts of sodium carboxymethylcellulose, 37.5 parts of ethanol, 0.125 part of polyvinyl alcohol, 0.096 part of silica sol, 0.025 part of polyacrylamide, 0.0083 part of soluble starch, 0.032 part of tween-800.0084, 0.032 part of glycerol and 600 parts of water.
The preparation method is the same as example 1.
The liquid mulching film produced by Liaoning company is taken as a comparative example, the main components of the liquid mulching film produced by the company are polyvinyl alcohol and calcium lignosulfonate, and the liquid mulching film prepared by the invention is subjected to performance detection, and the test method and the result are as follows:
reduced water evaporation test. Adding the same amount of fully dried, ground and uniformly mixed farmland soil into a cylindrical container with the same material and the same volume, adding water to keep the soil humidity at about 75% of the field water capacity, respectively spraying the liquid mulching films in the embodiment and the comparative example of the invention, spraying the same amount of water in a blank control, and repeating each treatment for 3 times. And (3) weighing regularly every day by adopting a regular weighing method, and calculating the accumulated evaporation capacity of soil moisture at different stages, as shown in table 1.
TABLE 1
The liquid mulching film in the embodiment 1 and the comparative example of the invention and the blank control are sprayed with the same amount of water. Soil humiture was monitored periodically using a humiture detector, 5 replicates for each treatment, as in table 2.
TABLE 2
Therefore, by adopting the liquid mulching film and the preparation method thereof, the prepared mulching film has short film forming time, long film maintaining time, better heat preservation and soil moisture preservation functions and biodegradability, simple preparation method, low price of raw materials, no harm to human bodies and no pollution to the environment, and really achieves an environment-friendly product.
Finally, it should be noted that: the above embodiments are only intended to illustrate the technical solution of the present invention and not to limit the same, and although the present invention is described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the invention without departing from the spirit and scope of the invention.
Claims (9)
1. The liquid mulching film is characterized by comprising the following raw materials: 7-15 parts of matrix, 17.5-37.5 parts of cosolvent, 0.125-0.655 part of film-forming assistant, 0.081-0.099 part of adhesive, 0.021-0.051 part of cross-linking agent, 0.0071-0.0091 part of soluble starch, 0.0070-0.0099 parts of surfactant, 0.030-0.039 part of glycerol and the balance of water.
2. The liquid mulching film according to claim 1, wherein: the matrix is sodium carboxymethyl cellulose.
3. The liquid mulching film according to claim 1, wherein: the cosolvent is 95% ethanol.
4. The liquid mulching film according to claim 1, wherein: the film-forming assistant is polyvinyl alcohol.
5. The liquid mulching film according to claim 1, wherein: the adhesive is silica sol with the grain diameter less than or equal to 30 nm.
6. The liquid mulching film according to claim 1, wherein: the cross-linking agent is polyacrylamide.
7. The liquid mulching film according to claim 1, wherein: the surfactant is tween-80.
8. The liquid mulching film according to any one of claims 1-7, comprising the following raw materials: by weight, 10.5 parts of sodium carboxymethylcellulose, 26.25 parts of ethanol, 0.125 part of polyvinyl alcohol, 0.096 part of silica sol, 0.025 part of polyacrylamide, 0.0083 part of soluble starch, 0.0084 part of tween-80, 0.032 part of glycerol and the balance of water.
9. The preparation method of the liquid mulching film is characterized by comprising the following steps:
s1, weighing sodium carboxymethylcellulose, placing the sodium carboxymethylcellulose in a drying container, adding ethanol, stirring for 10min to enable the sodium carboxymethylcellulose to be flocculent and serve as matrix slurry, adding 50% of water into a reaction kettle with a stirring paddle, heating in a water bath and continuously stirring at the stirring speed of 200r/min, adding a small amount of matrix slurry for multiple times in the stirring process, and stirring until the matrix slurry is pasty for at least 0.5 h;
s2, adding the rest 50% of water into the reaction kettle, adding polyvinyl alcohol and silica sol after the temperature in the reaction solution rises to 40 ℃, heating to 60 ℃, stirring for 2 hours, and naturally cooling to below 40 ℃;
and S3, adding polyacrylamide, soluble starch, tween-80 and glycerol into the mixed system, heating to 80 ℃, rapidly stirring for 5min at the stirring speed of 600r/min, adjusting the stirring speed to 100r/min, stirring for 25min, naturally cooling to 40 ℃, and discharging to a sealed tank to obtain the degradable liquid mulching film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116875118A (en) * | 2023-07-13 | 2023-10-13 | 中华全国供销合作总社天津再生资源研究所 | Grass-inhibiting liquid mulching film special for green house green beans and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103865216A (en) * | 2012-12-14 | 2014-06-18 | 中国科学院沈阳应用生态研究所 | Multifunctional degradable liquid mulch film and preparation method and usage method thereof |
| CN105199743A (en) * | 2014-06-17 | 2015-12-30 | 中国科学院沈阳应用生态研究所 | Water and soil conservation type degradable liquid mulching film and preparation and application thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103865216A (en) * | 2012-12-14 | 2014-06-18 | 中国科学院沈阳应用生态研究所 | Multifunctional degradable liquid mulch film and preparation method and usage method thereof |
| CN105199743A (en) * | 2014-06-17 | 2015-12-30 | 中国科学院沈阳应用生态研究所 | Water and soil conservation type degradable liquid mulching film and preparation and application thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116875118A (en) * | 2023-07-13 | 2023-10-13 | 中华全国供销合作总社天津再生资源研究所 | Grass-inhibiting liquid mulching film special for green house green beans and preparation method thereof |
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