CN106967234B - Paddy field all-degradable liquid film and preparation method thereof - Google Patents
Paddy field all-degradable liquid film and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L3/00—Compositions of starch, amylose or amylopectin or of their derivatives or degradation products
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- 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
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D1/00—Fertilisers containing potassium
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/80—Soil conditioners
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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
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- 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
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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
- C08J2303/00—Characterised by the use of starch, amylose or amylopectin or of their derivatives or degradation products
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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
- C08J2401/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
- C08J2401/02—Cellulose; Modified cellulose
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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
- C08J2433/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
- C08J2433/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters
- C08J2433/06—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters of esters containing only carbon, hydrogen, and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C08J2433/08—Homopolymers or copolymers of acrylic acid esters
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/16—Applications used for films
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Materials Engineering (AREA)
- Soil Sciences (AREA)
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- Polymers & Plastics (AREA)
- Pest Control & Pesticides (AREA)
- General Life Sciences & Earth Sciences (AREA)
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Abstract
The present invention provides a kind of paddy field all-degradable liquid films, belong to agricultural production application field.Constituent includes: potassium silicate, polyethyl acrylate, modified starch, glycerine, hops, fibre bundle, choline chloride and Aqua Folium Camelliae sinensis.Liquid film of the invention can improve ground temperature, good water-retaining property, potassium silicate is decomposed into the siliceous fertilizer and potash fertilizer that rice absorbing utilizes, thoroughly solves mulch to Soil Environmental Pollution, eliminate labour cost caused by cleaning mulch, plant nutrient is added again simultaneously, plays the role of strong bar, anti-fall, disease-resistant, volume increase.Manufacture craft is simple, and stability is good, and with strong points, convenient transportation is at low cost, saves a large amount of man power and materials, easy to operate, easy to spread, can promote eary maturity of rice 7-10 days, and positive impetus will be played to the yield of rice.
Description
Technical field
The invention belongs to agricultural production application fields, and in particular to a kind of paddy field all-degradable liquid film and its preparation side
Method.
Background technique
China is to account for the minimum country of water per capita in the world, and control water resource is abused and will be using water resource rationally
Following developing direction.Covering with ground sheeting can be with the use of effectively save water, and existing mulch is mostly based on plastic film, although right
Water has certain saving effect, but the recycling of mulch is a time-consuming and laborious job, and plastic film after the recovery is almost
It is non-degradable, it is easy to cause environmental pollution.
It is existing, using agricultural crop straw as primary raw material, in conjunction with the macromolecular liquid of the formation such as lignin, collagen
Film has that the film formation time phase is short although the problem of can solve white pollution, to the later period drought resisting effect of plant
It is very poor, and there is no toughness after at mulch, it is directed at earth's surface and is easy cracking.
Summary of the invention
The present invention provides a kind of dedicated all-degradable liquid film of paddy field for deficiency existing for current liquid film.
The present invention provides a kind of paddy field all-degradable liquid films, comprise the following components in parts by weight: potassium silicate 20~
45 parts, 1~6 part of polyethyl acrylate, 5~20 parts of glycerine, 10~20 parts of modified starch, 5~10 parts of Aqua Folium Camelliae sinensis, cellulose 1
~5 parts, 3~9 parts of choline chloride.
Preferably, it comprises the following components in parts by weight: 2~4 parts of cellulose, 4~8 parts of choline chloride.
Preferably, the Aqua Folium Camelliae sinensis is green tea water.
Preferably, the green tea is when annual output newly picked and processed tea leaves.
The present invention provides a kind of preparation methods of paddy field all-degradable liquid film, comprising the following steps:
(a) cellulose is mixed with choline chloride, obtains liquid phase mixture；
(b) polyethyl acrylate is mixed with modified starch, obtains polymer material；
(c) liquid phase mixture is mixed with the polymer material, obtains mixed material；
(d) mixed material that the step (c) obtains is mixed with including potassium silicate with the mixed solution of glycerine, is obtained
Feed liquid before forming a film；
(e) filtering, sedimentation, obtained liquid phase portion after mixing feed liquid before film forming that the step (d) obtains with Aqua Folium Camelliae sinensis
It is divided into paddy field all-degradable liquid film；
Without time sequencing between the step (a) and step (b).
Preferably, cellulose mixes under stirring conditions with choline chloride in the step (a), the temperature of the stirring
It is 85~90 DEG C, the rate of stirring is 50~100 revs/min.
Preferably, polyethyl acrylate mixes under stirring conditions with modified starch in the step (b), the stirring
Temperature be 60~70 DEG C, the rate of stirring is 100~150 revs/min.
Preferably, the aperture of filtering sieve is 300~500 mesh in the step (e).
Beneficial effect
Compared with prior art, paddy field all-degradable liquid film beneficial effect provided by the invention is:
Liquid film provided by the invention is dark brown since (1) is covered in earth's surface, and amount of solar heat can be absorbed, tool
There is the function of heating temperature raising；(2) coating of liquid-state mulch film is the soil 1-3 centimeters of soil surface layer to connecting, and is formed
The gelatinous layer of one layer of semi-enclosed " native film " form, existing permeability, and have certain sealing process, it is suppressed that partial moisture
Evaporation, thus the water conservation of mulch, insulating power can be improved；Test effect shows that compared to room temperature, 5cm can improve 3~5 under film
DEG C, 10cm can improve 4~8 DEG C under film；In the present invention, it is decomposed into humic acid after the modified starch corruption, potassium silicate decomposes
It for the absorbable siliceous fertilizer of crop and potash fertilizer, thoroughly solves pollution problem of the mulch to soil and environment, while increasing fertilizer again
Material plays the role of strong bar, anti-fall, disease-resistant, volume increase；
Liquid film provided by the invention is when in use, i.e. sprayable after being watered, easy to use, and saving of work and time is easy to operate,
It is easy to spread；And using after the liquid film, when emergence, which does not have to artificial seedling setting, to emerge naturally, save a large amount of manpower object
Power；
Liquid film production method simple process provided by the invention, stability are good；With strong points, convenient transportation is at low cost.
Specific embodiment
The present invention provides a kind of paddy field all-degradable liquid films, comprise the following components in parts by weight: potassium silicate 20~
45 parts, 1~6 part of polyethyl acrylate, 5~20 parts of glycerine, 10~20 parts of modified starch, 5~10 parts of Aqua Folium Camelliae sinensis, cellulose 1
~5 parts, 3~9 parts of choline chloride.
Liquid ground film provided by the invention preferably includes the component of following parts by weight: 2~4 parts of cellulose, choline chloride 4~
8 parts.In an embodiment of the present invention, potassium silicate, polyethyl acrylate, glycerine, modified starch, cellulose, choline chloride choosing
Select commercial product.
In the present invention, potassium silicate and cellulose are as film forming agent；Polyethyl acrylate is as emulsion agent；Glycerine is as cream
Agent；Modified starch can repair strand as renovation agent, increase high molecular polymerizable molecular amount, the thickness for making mulch form a film
Degree increases；For choline chloride as Spike development promotor, which has the ability that can promote electronic signal or a plant
Object photosynthesis promoter has obvious effects on to yield is increased, and wheat, rice spray in boot stage can promote spikelet differentiation,
More knot fringe grains, the pustulation period, which sprays, can accelerate filling speed, and fringe grain is full, and mass of 1000 kernel increases by 2~5 grams；Aqua Folium Camelliae sinensis is as soda acid tune
Save agent.
In the present invention, it is decomposed into humic acid after modified starch corruption, mineral grogs can be bonded to 0.25-10mm diameter
Small agglomerate has the characteristics that soaked not scattered water stability.This is the key point of liquid film heat preservation soil moisture conservation.Specific mechanism is: (1)
Under soil aggregate structure, energy chesson dredges air, improves ground temperature.(2) be conducive to the activity of edaphon, promote
The decomposition of organic substance increases soil nutrient deliverability, improves nutritional condition.(3) soil moisture is adjusted, water in soil is increased
Stability crumb structure quantity.Crumb structure is the small group that humus in soil is bonded to mineral grogs 0.25-10mm diameter
Block has the characteristics that soaked not scattered water stability, thus can achieve the effect that soil moisture conservation is taked precautions against drought.
In the present invention, the Aqua Folium Camelliae sinensis is preferably green tea water；The green tea is preferably when annual output newly picked and processed tea leaves；The tea
The pH value of Ye Shui is preferably 8.5.
In the present invention, the preparation method of the Aqua Folium Camelliae sinensis preferably includes: tealeaves being boiled in boiled water and is boiled.In the present invention
In, the mass ratio of the tealeaves and boiled water is preferably 1:200~500, more preferably 1:300；It is described to boil time for boiling and be preferably
10~20min, more preferably 15min.After the completion of the Aqua Folium Camelliae sinensis boiling is boiled, it is preferred that tealeaves is filtered out, and is cooled to room temperature, it is standby
With.
In the present invention, the liquid film is sticking oil-based liquid, and pH value is 6~8.
The present invention provides a kind of preparation methods of paddy field all-degradable liquid film, comprising the following steps:
(a) cellulose is mixed with choline chloride, obtains liquid phase mixture；
(b) polyethyl acrylate is mixed with modified starch, obtains polymer material；
(c) liquid phase mixture is mixed with the polymer material, obtains mixed material；
(d) mixed material that the step (c) obtains is mixed with including potassium silicate with the mixed solution of glycerine, is obtained
Feed liquid before forming a film；
(e) filtering, sedimentation, obtained liquid phase portion after mixing feed liquid before film forming that the step (d) obtains with Aqua Folium Camelliae sinensis
It is divided into paddy field all-degradable liquid film；
Without time sequencing between the step (a) and step (b).
The present invention preferably mixes cellulose with choline chloride under stirring conditions, obtains liquid phase mixture.In this hair
In bright, the temperature of the stirring is preferably 85~90 DEG C, more preferably 86~89 DEG C, most preferably 88.9 DEG C；The stirring
Rate is preferably 50~100 revs/min, more preferably 60~80 revs/min, most preferably 70 revs/min；The stirring when
Between preferably 40~45min, more preferably 41~44min, most preferably 42min.
The present invention preferably mixes polyethyl acrylate with modified starch under stirring conditions, obtains polymer material.?
In the present invention, the temperature of the stirring is preferably 60~70 DEG C, more preferably 62~67 DEG C, most preferably 66.1 DEG C；It is described to stir
The rate mixed is preferably 100~150 revs/min, more preferably 105~120 revs/min, most preferably 110 revs/min；It is described
The time of stirring is preferably 40~45min, more preferably 41~43min, most preferably 41.5min.
The present invention preferably mixes obtained liquid phase mixture and polymer material under stirring conditions, obtains mixture
Material.In the present invention, the liquid phase mixture is mixed with polymer material again after being preferably dropped to room temperature；The polymer material preferably drops
It is mixed again with liquid phase mixture after to room temperature.In the present invention, the speed of the stirring is preferably 50~150 revs/min, more
Preferably 80~120 revs/min, most preferably 100 revs/min；The time of the stirring is preferably 1~10min, more
Preferably 4~6min, most preferably 5min.
After obtaining mixed material, the present invention mixes the mixed material with the mixed solution for including potassium silicate and glycerine
It closes, obtains the preceding feed liquid that forms a film.In the present invention, the mixed solution of the potassium silicate and glycerine preferably stirs at 75~80 DEG C
Preparation；The rate of the stirring is preferably 40~50 revs/min, more preferably 44~48 revs/min, most preferably 45 revs/min
Clock；The time of the stirring is preferably 15~30min, more preferably 18~24min, most preferably 20min.
In the present invention, feed liquid preferably mixes under agitation before forming a film, and the rate of the stirring is preferably 100~
140 revs/min, more preferably 115~125 revs/min, most preferably 119 revs/min；The time of the stirring is preferred
It is 20~50min, more preferably 25~40min, most preferably 30min.
Before being formed a film after feed liquid, the present invention filters after mixing feed liquid before the film forming with Aqua Folium Camelliae sinensis.In the present invention,
The aperture of the filtering sieve is preferably 300~500 mesh, more preferably 400 mesh；
After the filtering, the present invention settles obtained filtrate, and obtained liquid phase part is paddy field all-degradable liquid film.
In the present invention, the sedimentation is preferably standing sedimentation；The time of the sedimentation is preferably 10~15h, more preferably 12h；
Below in conjunction with the embodiment in the present invention, the technical solution in the present invention is clearly and completely described.It is aobvious
So, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on the reality in the present invention
Example is applied, every other embodiment obtained by those of ordinary skill in the art without making creative efforts all belongs to
In the scope of protection of the invention.
Embodiment 1
Claim 1 part of cellulose, 3 parts of choline chloride, 1 part of polyethyl acrylate, 10 parts of modified starch, potassium silicate 20 by weight
Part, 5 parts of glycerine distinguish cellulose and choline chloride, glycerine and potassium silicate and polyethyl acrylate and modified starch
Mixing obtains liquid phase mixture, mixed solution and polymer material respectively after stirring；Add after liquid phase mixture is mixed with polymer material
It is added in mixed solution, then adds 5 parts of Aqua Folium Camelliae sinensis for boiling 10min by tealeaves and water quality ratio 1:200 boiling, after being sufficiently mixed, mistake
400 meshes obtain paddy field all-degradable liquid mulch film after settling 12h.
Embodiment 2
Claim 5 parts of cellulose, 9 parts of choline chloride, 6 parts of polyethyl acrylate, 20 parts of modified starch, potassium silicate 45 by weight
Part, 20 parts of glycerine, cellulose and choline chloride, glycerine and potassium silicate and polyethyl acrylate and modified starch are mixed respectively
It closes, obtains liquid phase mixture, mixed solution and polymer material after stirring respectively；It is added after liquid phase mixture is mixed with polymer material
Into mixed solution, then add 10 parts of Aqua Folium Camelliae sinensis that 15min is boiled by tealeaves and water quality ratio 1:300 boiling, after being sufficiently mixed, mistake
400 meshes obtain paddy field all-degradable liquid mulch film after settling 12h.
Embodiment 3
Claim 3 parts of cellulose, 5 parts of choline chloride, 3 parts of polyethyl acrylate, 15 parts of modified starch, potassium silicate 40 by weight
Part, 10 parts of glycerine, cellulose and choline chloride, glycerine and potassium silicate and polyethyl acrylate and modified starch are mixed respectively
It closes, obtains liquid phase mixture, mixed solution and polymer material after stirring respectively；It is added after liquid phase mixture is mixed with polymer material
Into mixed solution, then 6 parts of Aqua Folium Camelliae sinensis for boiling 18min by tealeaves and water quality ratio 1:400 boiling are added, after being sufficiently mixed, crosses 400
Mesh obtains paddy field all-degradable liquid mulch film after settling 12h.
Embodiment 4
Claim 2 parts of cellulose, 6 parts of choline chloride, 4 parts of polyethyl acrylate, 15 parts of modified starch, potassium silicate 30 by weight
Part, 10 parts of glycerine, cellulose and choline chloride, glycerine and potassium silicate and polyethyl acrylate and modified starch are mixed respectively
It closes, obtains liquid phase mixture, mixed solution and polymer material after stirring respectively；It is added after liquid phase mixture is mixed with polymer material
Into mixed solution, then 8 parts of Aqua Folium Camelliae sinensis for boiling 20min by tealeaves and water quality ratio 1:500 boiling are added, after being sufficiently mixed, crosses 400
Mesh obtains paddy field all-degradable liquid mulch film after settling 12h.
Embodiment 5
The paddy field all-degradable liquid film that Examples 1 to 4 obtains is used in paddy field as experimental group (SM),
And be arranged and do not spray liquid film, remaining operates identical blank control group (CK), application method are as follows: removes in combination with closing
Careless agent is administered simultaneously, and applies 1 kilogram of stoste per acre, when soil moisture is 50%, 30 times of dilution is watered, when soil moisture is
When 30%, 50 times of applications of dilution are watered, spraying time is morning or dusk.Temperature comparisons are as shown in table 1 under soil:
Temperature change table under 1. film of table (unit: DEG C)
It is measured through TDR time-domain reflectomer, liquid ground film experimental group and control group water holding capacity measure volumetric water content of soil
The results are shown in Table 2:
2. retention capacity of soil of table compares (unit: %)
To sum up, paddy field all-degradable liquid film has the good effect heat, be retained, preserving soil moisture, keeping a full stand of seedings, and can be rice
Growth provides special nutrition, and has potent group to pacify ability, and grogs can be coupled to ideal aggregate, improves soil particle
Capillarity, improve the permeability of soil, become soil conditioner.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (8)
1. a kind of paddy field all-degradable liquid film, which is characterized in that comprise the following components in parts by weight: potassium silicate 20~45
Part, 1~6 part of polyethyl acrylate, 5~20 parts of glycerine, 10~20 parts of modified starch, 5~10 parts of Aqua Folium Camelliae sinensis, cellulose 1~5
Part, 3~9 parts of choline chloride.
2. liquid film according to claim 1, which is characterized in that the chlorination gallbladder including 2~4 parts of celluloses and 4~8 parts
Alkali.
3. liquid film according to claim 1 or 2, which is characterized in that the Aqua Folium Camelliae sinensis is green tea water.
4. liquid film according to claim 3, which is characterized in that the green tea is when annual output newly picked and processed tea leaves.
5. the preparation method of any one paddy field all-degradable liquid film according to claim 1~4, which is characterized in that including
Following steps:
(a) cellulose is mixed with the choline chloride, obtains liquid phase mixture；
(b) polyethyl acrylate is mixed with the modified starch, obtains polymer material；
(c) liquid phase mixture is mixed with the polymer material, obtains mixed material；
(d) mixed material that the step (c) obtains is mixed with including the potassium silicate with the mixed solution of the glycerine,
Obtain the preceding feed liquid that forms a film；
(e) filtering, sedimentation, obtained liquid phase portion after mixing feed liquid before film forming that the step (d) obtains with the Aqua Folium Camelliae sinensis
It is divided into paddy field all-degradable liquid film；
Without time sequencing between the step (a) and step (b).
6. preparation method according to claim 5, which is characterized in that cellulose and choline chloride exist in the step (a)
It is mixed under conditions of stirring, the temperature of the stirring is 85~90 DEG C, and the rate of stirring is 50~100 revs/min.
7. preparation method according to claim 5, which is characterized in that polyethyl acrylate and modification in the step (b)
Starch mixes under stirring conditions, and the temperature of the stirring is 60~70 DEG C, and the rate of stirring is 100~150 revs/min.
8. preparation method according to claim 5, which is characterized in that the aperture of filtering sieve is 300 in the step (e)
~500 mesh.
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| CN101323706A (en) * | 2008-07-25 | 2008-12-17 | 王芝代 | Biodegradable liquid agricultural film |
| CN102517032B (en) * | 2011-12-08 | 2015-02-11 | 董广林 | Fully-degradable liquid medical membrane for paddy field |
| CN103819923A (en) * | 2012-11-19 | 2014-05-28 | 罗世伟 | Humic-acid silicic-acid biodegradable agricultural mulching film |
| CN104803785A (en) * | 2015-04-24 | 2015-07-29 | 合肥康龄养生科技有限公司 | Corn used liquid fertilizer mulching film for preventing soil hardening and preparation method thereof |
| CN106117627A (en) * | 2016-07-28 | 2016-11-16 | 马鞍山市五谷禽业专业合作社 | A kind of shading degradable agricultural film |
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