CN109181214A - A kind of getting fat is retained the preparation method of degradable liquid-state mulch film - Google Patents
A kind of getting fat is retained the preparation method of degradable liquid-state mulch film Download PDFInfo
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- C08J5/18—Manufacture of films or sheets
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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
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- C08J2361/00—Characterised by the use of condensation polymers of aldehydes or ketones; Derivatives of such polymers
- C08J2361/20—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C08J2361/22—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with acyclic or carbocyclic compounds
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Abstract
The invention belongs to produce agricultural film preparation technical field, and in particular to a kind of getting fat is retained the preparation method of degradable liquid-state mulch film.The present invention is by natural coconut shell flour, straw ash and water are mixed with beating to obtain slurries, with slurries, urea, glucose, peat etc. is fermentation raw material, heat-preservation fermentation obtains fermentation liquid, shrimp shell glue is obtained by raw material of shrimp shell meal, finally by getting fat pre-polymerization ureaformaldehyde glue, mulch is retained glue, oxidized starch Hybrid Heating obtains suspended dispersed liquid, it collects lower layer's glue and obtains liquid-state mulch film, the mulch water conservation glue is chitosan-polyvinyl alcohol-sodium alginate composite membrane liquid, secondary pollution will not be generated to soil, nutrient slow release in compound fertilizer, reach getting fat function of fertilizer retention, mulch of the invention is retained glue, improve stability of the liquid-state mulch film in slowly drained soil, getting fat pre-polymerization ureaformaldehyde glue is by being cross-linked to form the water suction liquid-state mulch film substrate of high viscosity with oxidized starch, it has broad application prospects.
Description
Technical field
The invention belongs to produce agricultural film preparation technical field, and in particular to a kind of degradable liquid-state mulch film of getting fat water conservation
Preparation method.
Background technique
Plastic film mulching cultivation is the important means in agricultural production, can satisfy crops using covering with ground sheeting and heats, protects
Moisture in the soil, the needs for keeping fertility, the getting up early for being mainly used for the north, arid, cold district crop cover and check winds and fix drifting sand, have and promote
Into crop yield, improving quality, the ahead of time functions such as maturation.
Agricultural has plastic film and liquid-state mulch film using mulch at present.Plastic film is on the high side, takes when applying operating cost
Power, plastic film mulching is sometimes serious because of plant growth initial soil moisture and nutrient depletion, and precipitation is not easy to penetrate into soil
In earth, the later period will appear serious dehydration, de- fertile phenomenon, lead to the underproduction.Have an impact in addition, farmland incomplete film is removed to ecological environment
Outside, it also will affect soil physical and chemical property, plant root growth hindered, so that influencing development of plants causes the underproduction.
Liquid-state mulch film is also known as liquid film on soil surface, is that a kind of cream is sprayed in soil surface and formed using suppressing
One layer of gel-like film, belongs to soil conditioner class, is a kind of high molecular film forming matter, can promote Zinc fractions granule, improvement
Soil texture, fixed surface soil, protection topsoil, the general name for inhibiting moisture evaporation, the high-molecular compound for preventing water loss, are states
A kind of inside and outside high-new soil protection technology newly emerged.It, will not after since the mulch itself has biodegradable performance
Remain in soil, more will not relate to mulch recycling problem, desert, farmland, sloping upland, deflation basin, Bu Huiyin can be used in
Play secondary pollution.
Currently, the film forming and caking property that existing liquid-state mulch film product has are lower, film strength is lower, sprays in earth's surface
After have phenomena such as cracking, ventilated, water conservation, heat preservation and fertilizer conservation effect are poor.Some passes through rain drop erosion, and Premature disintegration takes off
Film does not have due effect.Some products contain anion or nonionic surfactant, and film-formation result is poor, it is also possible to make
At soil pollution.
Therefore it provides a kind of film-formation result in earth's surface is good, soil texture can be improved, water conservation, heat insulation effect are outstanding, hold
It is degradable, and have and increase the problem of liquid-state mulch film of soil fertility is urgent need to resolve of the present invention.
Summary of the invention
Present invention mainly solves the technical issues of, the film forming that has for current liquid-state mulch film product and caking property compared with
Low, film strength is lower, and spray has phenomena such as cracking, ventilated after earth's surface, and water conservation and fertilizer conservation effect are poor, by rainwater
After washing away, the defect of Premature disintegration, demoulding provides the preparation method that a kind of getting fat is retained degradable liquid-state mulch film.
In order to solve the above-mentioned technical problem, the technical scheme adopted by the invention is that:
A kind of getting fat is retained the preparation method of degradable liquid-state mulch film, it is characterised in that specific preparation step are as follows:
(1) soybean stalk is lighted to obtain straw ash, then natural coconut shell flour, straw ash, water is mixed, be placed in refiner and be beaten
Slurries are obtained, is added and sends out after 2.0~2.5L slurries, 400~500mL biogas slurry, 20~25g peat, 60~70g potassium nitrate are mixed
In fermentation tank, sealed fermenter, in the greenhouse, heat-preservation fermentation are taken out fermentation liquid and are put into water-bath, addition 100~120g urea,
200~300mL formalin, heat temperature raising, constant temperature stirs 3~4h and obtains getting fat pre-polymerization ureaformaldehyde glue, spare；
(2) it takes 40~50g sea shrimp shrimp shell meal to be scattered in 100~120mL acetum, it is poly- that 2~3mL is added into acetum
Sorb ester -80, heat temperature raising, with magnetic stirring apparatus with the revolving speed stirring and dissolving of 400~500r/min, then it is equal with high speed disperser
Matter dispersion, is dialysed with membrane filtration, obtains shrimp shell glue；
(3) it takes 20~30g sodium alginate to be dissolved in 120~150mL distilled water, 20~30mL glycerol is added into distilled water, stirs
It mixes to sodium alginate after being completely dissolved, obtains mixed liquor, mixed liquor is placed in degassing process in vacuum air pump, obtains alginic acid
Sodium viscose glue；
(4) sodium alginate viscose glue is mixed with shrimp shell glue, obtained mixing film liquid is placed in a beaker, then beaker is put into water
40~50g polyvinyl alcohol is added into beaker for heat temperature raising in bath, starts magnetic stirring apparatus, with turning for 500~600r/min
Speed is dispersed with stirring to obtain mulch water conservation glue；
(5) according to parts by weight, 40~50 parts of spare getting fat pre-polymerization ureaformaldehyde glues, 20~30 parts of mulches are retained glue, 18
~20 parts of oxidized starch are placed in water-bath, heat temperature raising, and constant temperature stirs 30~45min and obtains suspended dispersed liquid, are then poured into
Lower layer's jelly is collected in centrifugal treating in supercentrifuge, sedimentation, and discharging obtains getting fat and is retained degradable liquid-state mulch film.
Natural coconut shell flour described in step (1), straw ash, water mixing mass ratio are 2 ︰, 1 ︰ 3, and biogas slurry solid masses content is
20%, greenhouse temperature is 40~45 DEG C, and the heat-preservation fermentation time is 8~10 days, and the mass fraction of formalin is 37%, and water-bath adds
Temperature is 70~75 DEG C after heat heating.
The mass fraction of acetum described in step (2) is 5%, and temperature is 70~80 DEG C after heat temperature raising, high speed dispersion
Machine homogenous disperse revolving speed is 5000~6000r/min, and filter sizes are 120~150nm.
The degassing process time is 5~10min in vacuum air pump described in step (3), controls vacuum in vacuum air pump
Degree is 80~90Pa.
Sodium alginate viscose glue described in step (4) and shrimp shell glue mixed volume ratio are 1 ︰ 2, heat and rise in water-bath
Temperature is 80~90 DEG C after temperature.
After water-bath heat temperature raising described in step (5) temperature be 45~50 DEG C, supercentrifuge rotating speed be 2000~
3000r/min, centrifugal treating time are 18~20min.
The beneficial effects of the present invention are:
(1) present invention be mixed with beating natural coconut shell flour, straw ash and water to obtain slurries, with slurries, urea, glucose, peat,
Potassium nitrate, biogas slurry etc. are fermentation raw material, are fermented by sealing thermal insulation, obtain fermentation liquid, fermentation material, urea, formaldehyde are heated permanent
Getting fat pre-polymerization ureaformaldehyde glue is prepared in temperature reaction, disperses sea shrimp shrimp shell meal in acetum, adds Tween-80,
Disperse to obtain shrimp shell glue through high speed homogenization after heating stirring, sodium alginate is dissolved in distilled water, glycerol is added, by vacuum
Degassing process obtains sodium alginate viscose glue, and sodium alginate viscose glue is mixed with shrimp shell glue, polyvinyl alcohol is added after heating, stirring
Dispersion obtains mulch water conservation glue, finally obtains getting fat pre-polymerization ureaformaldehyde glue, mulch water conservation glue, oxidized starch Hybrid Heating
Suspended dispersed liquid, sedimentation collects lower layer's glue and obtains the degradable liquid-state mulch film of getting fat water conservation, getting fat water conservation of the invention after centrifugation
Degradable liquid-state mulch film is crosslinked by getting fat pre-polymerization ureaformaldehyde glue and oxidized starch, then with mulch water conservation glue coating preparation and
At the mulch water conservation glue is chitosan-polyvinyl alcohol-sodium alginate composite membrane liquid, is contained on chitosan main chain easy
The ester bond of hydrolysis, in the soil hygroscopic hydrolysis, the water of the small molecule of absorption are moved to the ground film surface of mulch water conservation glue, lead to
The mode for crossing diffusion enters around hydrophilic radical or ester bond, and under acid or alkalinity soil environment, ester bond can all occur certainly
By hydrolytic cleavage, molecular weight is slowly reduced, when molecular weight reduce to a certain extent, start to dissolve, become soluble catabolite,
The fusing point of polyvinyl alcohol can also reduce when moisture absorption amount is larger, be slowly dissolved polyvinyl alcohol, the surface-coating energy of compound fertilizer
Enough preferable degradations will not generate secondary pollution to soil, and the water penetration of polyvinyl alcohol and chitosan is strong, but inorganic to charging
Salt fertilizer by there is certain repulsive interaction, make nutrient slow release in compound fertilizer, reach getting fat function of fertilizer retention；
(2) it is natural former that natural coconut shell flour, peat, straw ash etc. are used in the present invention during preparation getting fat pre-polymerization ureaformaldehyde glue
Expect, ash content, lignin, cellulose, pentosan are contained in natural coconut shell flour, and principal component is potassium hydroxide in ash content, is made by fermentation
Carbohydrate, cellulose degradation are nutritious fertilizer, when preparing pre-polymerization ureaformaldehyde glue, keep urea excessive, humic acid in potassium nitrate and peat
Nitro humus acid is generated under the conditions of alkaline fermentation, since humic acid especially nitro humus acid being added in urea, urea can be made
It decomposes slowly, fertilizer efficiency is lasting, and loss reduces, to make the fertilizer conservation effect promoting of liquid-state mulch film of the invention, mulch of the invention
Water conservation glue is chitosan-polyvinyl alcohol-sodium alginate composite membrane liquid, and sodium alginate member accumulates to form cross-linked network structure,
To form hydrogel, stability of the liquid-state mulch film in slowly drained soil is promoted, mulch is retained the-NH in glue on chitosan3+
Electrostatic easily occurs with-the COO- on sodium alginate to react, it can be immediately in chemical fertilizer granule Surface Creation microsolubility high polymer, this height
Polymers be by ionization property group hydrophilic macromolecule chain mutually it is lightly crosslinked made of polymer, network-like structure can
To adsorb nutrient ion, and absorption of the soil to nutrient element can be improved by the crumb structure in stable soil, discharge
Held nutrient is used for crop out, and getting fat pre-polymerization ureaformaldehyde glue is by being cross-linked to form with oxidized starch the water suction liquid of high viscosity
Film base material, it is easy film-forming in soil surface, forms high-intensitive mulch, and drink up the rain consolidated soil, and is easy drop
Solution, has broad application prospects.
Specific embodiment
Soybean stalk is lighted to obtain straw ash, then by natural coconut shell flour, straw ash, water is in mass ratio that 2 ︰, 1 ︰ 3 is mixed,
It is placed in 1~2h of mashing in refiner and obtains slurries, by 2.0~2.5L slurries, the natural pond that 400~500mL solid masses content is 20%
It is added in fermentor after liquid, 20~25g peat, the mixing of 60~70g potassium nitrate, sealed fermenter, is 40~45 DEG C in temperature
In greenhouse, heat-preservation fermentation 8~10 days, takes out fermentation liquid and be put into water-bath, 100~120g urea, 200~300mL matter is added
The formalin that score is 37% is measured, is heated to 70~75 DEG C, constant temperature stirs 3~4h and obtains getting fat pre-polymerization ureaformaldehyde glue, standby
With；It takes 40~50g sea shrimp shrimp shell meal to be scattered in the acetum that 100~120mL mass fraction is 5%, adds into acetum
Enter 2~3mL Tween-80, be heated to 70~80 DEG C, is stirred with magnetic stirring apparatus with the revolving speed of 400~500r/min
Dissolution, then be 120~150nm with aperture with high speed disperser with revolving speed 4~5min of homogenous disperse of 5000~6000r/min
Membrane filtration dialysis, obtain shrimp shell glue；20~30g sodium alginate is taken to be dissolved in 120~150mL distilled water, to distilled water
Middle addition 20~30mL glycerol obtains mixed liquor, mixed liquor is placed in vacuum air pump after stirring is completely dissolved to sodium alginate
Middle 5~10min of degassing process, controlling vacuum degree in vacuum air pump is 80~90Pa, obtains sodium alginate viscose glue；By alginic acid
Sodium viscose glue is that 1 ︰ 2 is mixed with shrimp shell glue by volume, obtained mixing film liquid is placed in a beaker, then beaker is put into water-bath
80~90 DEG C are heated in pot, 40~50g polyvinyl alcohol is added into beaker, starts magnetic stirring apparatus, with 500~
The revolving speed of 600r/min is dispersed with stirring to obtain mulch water conservation glue；According to parts by weight, by 40~50 parts of spare getting fat pre-polymerizations
Ureaformaldehyde glue, 20~30 parts of mulch water conservation glues, 18~20 parts of oxidized starch are placed in water-bath, are heated to 45~50
DEG C, constant temperature stirs 30~45min and obtains suspended dispersed liquid, is then poured into supercentrifuge and is turned with 2000~3000r/min
Fast 18~20min of centrifugal treating settles 12~15h, collects lower layer's jelly, and discharging obtains getting fat with being retained degradable liquid
Film.
Example 1
Soybean stalk is lighted to obtain straw ash, then by natural coconut shell flour, straw ash, water is in mass ratio that 2 ︰, 1 ︰ 3 is mixed, is placed in
It is beaten 1h in refiner and obtains slurries, by 2.0L slurries, the biogas slurry that 400mL solid masses content is 20%, 20g peat, 60g nitre
It is added in fermentor after sour potassium mixing, sealed fermenter, in the greenhouse that temperature is 40 DEG C, heat-preservation fermentation 8 days, takes out fermentation liquid
It is put into water-bath, 100g urea is added, the formalin that 200mL mass fraction is 37%, is heated to 70 DEG C, constant temperature stirs
It mixes 3h and obtains getting fat pre-polymerization ureaformaldehyde glue, it is spare；40g sea shrimp shrimp shell meal is taken to be scattered in the acetic acid that 100mL mass fraction is 5% molten
In liquid, 2mL Tween-80 is added into acetum, is heated to 70 DEG C, with magnetic stirring apparatus turning with 400r/min
Fast stirring and dissolving, then with high speed disperser with the revolving speed homogenous disperse 4min of 5000r/min, the filter membrane mistake for being 120nm with aperture
Filter dialysis, obtains shrimp shell glue；It takes 20g sodium alginate to be dissolved in 120mL distilled water, 20mL glycerol is added into distilled water, stirs
It mixes to sodium alginate after being completely dissolved, obtains mixed liquor, mixed liquor is placed in degassing process 5min in vacuum air pump, control is true
Vacuum degree is 80Pa in empty pump mechanism of qi, obtains sodium alginate viscose glue；It is by volume 1 ︰ 2 by sodium alginate viscose glue and shrimp shell glue
Mixing, obtained mixing film liquid is placed in a beaker, then beaker is put into water-bath and is heated to 80 DEG C, is added into beaker
Enter 40g polyvinyl alcohol, start magnetic stirring apparatus, is dispersed with stirring to obtain mulch water conservation glue with the revolving speed of 500r/min；By weight
40 parts of spare getting fat pre-polymerization ureaformaldehyde glues, 20 parts of mulch water conservation glues, 18 parts of oxidized starch are placed in water-bath by number meter
In, 45 DEG C are heated to, constant temperature stirring 30min obtains suspended dispersed liquid, is then poured into supercentrifuge with 2000r/min
Revolving speed centrifugal treating 18min, settle 12h, collect lower layer's jelly, discharging obtains getting fat and is retained degradable liquid-state mulch film.
Example 2
Soybean stalk is lighted to obtain straw ash, then by natural coconut shell flour, straw ash, water is in mass ratio that 2 ︰, 1 ︰ 3 is mixed, is placed in
It is beaten 1h in refiner and obtains slurries, by 2.3L slurries, the biogas slurry that 450mL solid masses content is 20%, 23g peat, 65g nitre
It is added in fermentor after sour potassium mixing, sealed fermenter, in the greenhouse that temperature is 43 DEG C, heat-preservation fermentation 9 days, takes out fermentation liquid
It is put into water-bath, 110g urea is added, the formalin that 250mL mass fraction is 37%, is heated to 73 DEG C, constant temperature stirs
It mixes 3h and obtains getting fat pre-polymerization ureaformaldehyde glue, it is spare；45g sea shrimp shrimp shell meal is taken to be scattered in the acetic acid that 110mL mass fraction is 5% molten
In liquid, 2mL Tween-80 is added into acetum, is heated to 75 DEG C, with magnetic stirring apparatus turning with 450r/min
Fast stirring and dissolving, then with high speed disperser with the revolving speed homogenous disperse 4min of 5500r/min, the filter membrane mistake for being 130nm with aperture
Filter dialysis, obtains shrimp shell glue；It takes 25g sodium alginate to be dissolved in 130mL distilled water, 25mL glycerol is added into distilled water, stirs
It mixes to sodium alginate after being completely dissolved, obtains mixed liquor, mixed liquor is placed in degassing process 7min in vacuum air pump, control is true
Vacuum degree is 85Pa in empty pump mechanism of qi, obtains sodium alginate viscose glue；It is by volume 1 ︰ 2 by sodium alginate viscose glue and shrimp shell glue
Mixing, obtained mixing film liquid is placed in a beaker, then beaker is put into water-bath and is heated to 85 DEG C, is added into beaker
Enter 45g polyvinyl alcohol, start magnetic stirring apparatus, is dispersed with stirring to obtain mulch water conservation glue with the revolving speed of 550r/min；By weight
45 parts of spare getting fat pre-polymerization ureaformaldehyde glues, 25 parts of mulch water conservation glues, 19 parts of oxidized starch are placed in water-bath by number meter
In, 47 DEG C are heated to, constant temperature stirring 37min obtains suspended dispersed liquid, is then poured into supercentrifuge with 2500r/min
Revolving speed centrifugal treating 19min, settle 13h, collect lower layer's jelly, discharging obtains getting fat and is retained degradable liquid-state mulch film.
Example 3
Soybean stalk is lighted to obtain straw ash, then by natural coconut shell flour, straw ash, water is in mass ratio that 2 ︰, 1 ︰ 3 is mixed, is placed in
It is beaten 2h in refiner and obtains slurries, by 2.5L slurries, the biogas slurry that 500mL solid masses content is 20%, 25g peat, 70g nitre
It is added in fermentor after sour potassium mixing, sealed fermenter, in the greenhouse that temperature is 45 DEG C, heat-preservation fermentation 10 days, takes out fermentation
Liquid is put into water-bath, 120g urea is added, the formalin that 300mL mass fraction is 37%, is heated to 75 DEG C, constant temperature
Stirring 4h obtains getting fat pre-polymerization ureaformaldehyde glue, spare；50g sea shrimp shrimp shell meal is taken to be scattered in the acetic acid that 120mL mass fraction is 5%
In solution, 3mL Tween-80 is added into acetum, 80 DEG C are heated to, with magnetic stirring apparatus with 500r/min's
Revolving speed stirring and dissolving, then with high speed disperser with the revolving speed homogenous disperse 5min of 6000r/min, the filter membrane for being 150nm with aperture
Filtering dialysis, obtains shrimp shell glue；It takes 30g sodium alginate to be dissolved in 150mL distilled water, 30mL glycerol is added into distilled water,
After stirring is completely dissolved to sodium alginate, mixed liquor is obtained, mixed liquor is placed in degassing process 10min in vacuum air pump, controlled
Vacuum degree is 90Pa in vacuum air pump processed, obtains sodium alginate viscose glue；By volume by sodium alginate viscose glue and shrimp shell glue
For 1 ︰ 2 mixing, obtained mixing film liquid is placed in a beaker, then beaker is put into water-bath and is heated to 90 DEG C, to burning
50g polyvinyl alcohol is added in cup, starts magnetic stirring apparatus, is dispersed with stirring to obtain mulch water conservation glue with the revolving speed of 600r/min；
According to parts by weight, 50 parts of spare getting fat pre-polymerization ureaformaldehyde glues, 30 parts of mulch water conservation glues, 20 parts of oxidized starch are placed in water
In bath, be heated to 50 DEG C, constant temperature stirring 45min obtains suspended dispersed liquid, be then poured into supercentrifuge with
The revolving speed centrifugal treating 20min of 3000r/min settles 15h, collects lower layer's jelly, and discharging obtains getting fat and is retained degradable liquid
State mulch.
Comparative example
With the liquid-state mulch film of Shanghai City company production as a comparison case to getting fat produced by the present invention with being retained degradable liquid
Liquid-state mulch film in film and comparative example is detected, and testing result is as shown in table 1:
(stoste adds 5 times of weight to the liquid-state mulch film being retained in degradable liquid-state mulch film and comparative example with getting fat produced by the present invention
Water dilution) be research object, by field trial to the water conservation of mulch product, heat, adjust the functions such as growth, volume increase and test
Card and evaluation.
Water retention property test
After the completion of liquid-state mulch film is sprayed, 5~10cm soil layer soil moisture content is measured using oven drying method, every 7d is sampled with earth boring auger and examined
It surveys primary.The depths the underground 10cm soil moisture is measured using ground thermometer, every 7d is primary in set time measurement.
Degradation property test
After the completion of liquid-state mulch film is sprayed, choose respectively degradable having a size of 100cm × 100cm getting fat water conservation produced by the present invention
Liquid-state mulch film in liquid-state mulch film and comparative example observes Plastic-film disintegration situation as sample after 40 days.
1 performance measurement result of table
From the data in table 1, it can be seen that getting fat produced by the present invention is retained degradable liquid-state mulch film, there is good film-forming property, film-strength is high, drop
The features such as solution is had excellent performance, soil heat preservation water conservation, in terms of be superior to be used alone fertilizer plot, and safety
It is nontoxic, raw material sources are extensive, have important market value and social value.
Claims (6)
1. the preparation method that a kind of getting fat is retained degradable liquid-state mulch film, it is characterised in that specific preparation step are as follows:
(1) soybean stalk is lighted to obtain straw ash, then natural coconut shell flour, straw ash, water is mixed, be placed in refiner and be beaten
Slurries are obtained, is added and sends out after 2.0~2.5L slurries, 400~500mL biogas slurry, 20~25g peat, 60~70g potassium nitrate are mixed
In fermentation tank, sealed fermenter, in the greenhouse, heat-preservation fermentation are taken out fermentation liquid and are put into water-bath, addition 100~120g urea,
200~300mL formalin, heat temperature raising, constant temperature stirs 3~4h and obtains getting fat pre-polymerization ureaformaldehyde glue, spare；
(2) it takes 40~50g sea shrimp shrimp shell meal to be scattered in 100~120mL acetum, it is poly- that 2~3mL is added into acetum
Sorb ester -80, heat temperature raising, with magnetic stirring apparatus with the revolving speed stirring and dissolving of 400~500r/min, then it is equal with high speed disperser
Matter dispersion, is dialysed with membrane filtration, obtains shrimp shell glue；
(3) it takes 20~30g sodium alginate to be dissolved in 120~150mL distilled water, 20~30mL glycerol is added into distilled water, stirs
It mixes to sodium alginate after being completely dissolved, obtains mixed liquor, mixed liquor is placed in degassing process in vacuum air pump, obtains alginic acid
Sodium viscose glue；
(4) sodium alginate viscose glue is mixed with shrimp shell glue, obtained mixing film liquid is placed in a beaker, then beaker is put into water
40~50g polyvinyl alcohol is added into beaker for heat temperature raising in bath, starts magnetic stirring apparatus, with turning for 500~600r/min
Speed is dispersed with stirring to obtain mulch water conservation glue；
(5) according to parts by weight, 40~50 parts of spare getting fat pre-polymerization ureaformaldehyde glues, 20~30 parts of mulches are retained glue, 18
~20 parts of oxidized starch are placed in water-bath, heat temperature raising, and constant temperature stirs 30~45min and obtains suspended dispersed liquid, are then poured into
Lower layer's jelly is collected in centrifugal treating in supercentrifuge, sedimentation, and discharging obtains getting fat and is retained degradable liquid-state mulch film.
2. the preparation method that a kind of getting fat according to claim 1 is retained degradable liquid-state mulch film, it is characterised in that: step
(1) natural coconut shell flour, straw ash, water mixing mass ratio described in are 2 ︰, 1 ︰ 3, and biogas slurry solid masses content is 20%, greenhouse temperature
It is 40~45 DEG C, the heat-preservation fermentation time is 8~10 days, and the mass fraction of formalin is 37%, temperature after water-bath heat temperature raising
It is 70~75 DEG C.
3. the preparation method that a kind of getting fat according to claim 1 is retained degradable liquid-state mulch film, it is characterised in that: step
(2) mass fraction of the acetum described in is 5%, and temperature is 70~80 DEG C after heat temperature raising, and high speed disperser homogenous disperse turns
Speed is 5000~6000r/min, and filter sizes are 120~150nm.
4. the preparation method that a kind of getting fat according to claim 1 is retained degradable liquid-state mulch film, it is characterised in that: step
(3) the degassing process time is 5~10min in the vacuum air pump described in, and controlling vacuum degree in vacuum air pump is 80~90Pa.
5. the preparation method that a kind of getting fat according to claim 1 is retained degradable liquid-state mulch film, it is characterised in that: step
(4) sodium alginate viscose glue and shrimp shell glue mixed volume ratio described in are 1 ︰ 2, heat and rise in water-bath
Temperature is 80~90 DEG C after temperature.
6. the preparation method that a kind of getting fat according to claim 1 is retained degradable liquid-state mulch film, it is characterised in that: step
(5) temperature is 45~50 DEG C after the water-bath heat temperature raising described in, and supercentrifuge rotating speed is 2000~3000r/min, centrifugation
The processing time is 18~20min.
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