CN102337138A - Biodegradable liquid mulch film produced from papermaking waste liquid, and production method thereof - Google Patents
Biodegradable liquid mulch film produced from papermaking waste liquid, and production method thereof Download PDFInfo
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Abstract
The invention relates to a biodegradable liquid mulch film produced from papermaking waste liquid, and a production method thereof. The film is produced from papermaking waste liquid discharged from paper making industries, starch, polyvinyl alcohol, acrylic acid or methacrylic acid or acrylamide, amyl acrylate or octyl acrylate, formaldehyde or glutaral or glyoxal, and the like. According to the method, lignin is grafted with acryl; starch is grafted with acryl; lignin, starch and polyethylene glycol hydroxyl are processed through a series chemical reactions of condensation, cross-linking, and copolymerization, such that an aqueous polymer with lignin as a basic material is synthesized. Therefore, the biodegradable liquid mulch film is obtained. According to the invention, industrial papermaking waste liquid is adopted as a main material, such that the pollution caused by papermaking waste liquid is reduced, environment is protected, cost is saved, irrigation water is saved, and crop yield is improved. With the wide popularization of the biodegradable liquid mulch film, a positive effect is provided for increasing the crop yield in our nation.
Description
Affiliated field
The invention belongs to new agricultural technology, relate to environment protection, trade refuse utilization, especially relate to biological degradation liquid film and method of manufacture thereof that a kind of papermaking wastewater is produced.
Technical background
Along with the continuous development of agricultural modernization, the rural area uses mulch film to become the important means of guaranteeing the agricultural year stable yields.But along with the prolongation of the plastic film mulching cultivation time limit, the residual mulch film recovery is low, and residual-film amount progressively increases in the soil, and very easily causing mulch film to pollute is white pollution.At first, residual ground film destroy soil physical and chemical property, cause the crop root difficulty of growing.All soil with residual film stops root system to be ganged up, normal moisture and the nutrient of absorbing of influence; When applying fertilizer between the crop strain, there have the residual film of bulk to isolate to be then separated fertile, influences fertilizer efficiency, causes output to descend.Measure according to Xinjiang environment department of formation: seed is broadcast to be had in the soil of residual film, and mashed kind of a rate reaches 6.92%, mashed bud rate 5.17%; Cotton seedling lateral root reduces 4.8～7.6 than normal; The cotton seedling of 2～3 leaf periods is dead 1.19%, and the cotton seedling of cotyledon period is dead 3.08%, postpones squaring period 3～5 days.Plant height reduces 6.7cm～12.9cm.In addition, have survey data to show: residual film reaches level of signification to the difference of corn yield influence, and per hectare has the soil of 187.5 kilograms of residual films, produces 9420 kilograms of corns, than 909 kilograms of the contrast field underproduction corns of no residual film, underproduction rate 8.8%.Secondly, after the residual film of pastoral area outcrop is eaten by ox, sheep mistake, intercept esophagus influence digestion, death incident constantly takes place.In addition because a large amount of residual films exist, plough, residual film is wrapped on the agricultural machinery and implement or stops up seed sower through regular meeting during farming operation such as whole ground, sowing, thereby influence the quality that farming is operated and sowed.Residual film is blown to the family behind the house, field, treetop, influence rural environment, causes " visual pollution ".The peasant burns residual film in the ground through regular meeting, and the plastics burning can produce multiple deleterious gases such as hydrogenchloride (HCl), dioxin, causes topsoil.Therefore, developing degradable, free of contamination mulch film novel material is the desirable approach that the residual film of radical cure pollutes.
At present, the domestic rarely seen report of succeeding in developing of Wholly-degradable plastic film, but can be a lot of at the plastics report of realizing degraded in varying degrees.Their ubiquity production costs are high, the product degraded not exclusively or mechanical property and water tolerance relatively poor, price exceeds the acceptable limit of peasant.For example, 18000 yuan per ton of the degradable mulch that produce Tianjin, and 11000 yuan per ton of common polythene mulch film, both prices differ too much, promote difficulty, therefore, fail to realize the big area popularization always.
For overcoming the above problems, Patent Office discloses several technology, as: application number is CN01130553.3, relates to the liquid-state rare-earth ground film technology; Its component comprises the macromolecule water uptake water-retaining resin, plant-growth regulator, seed manure and trace element; Biological pesticide, membrane-forming agent, tensio-active agent and solubility promoter.But application number CN02108889.6 tells about the preparation spray of polyvinyl alochol modifier-liquid ecological mulchine film shines ability form mulching natural degradation, non-secondary pollution behind the face of land; Be applicable to and administer the desert; Improve the soil preserve moisture and fertility with soil; Vegetation afforestation, increase crop yield etc. has good result.The invention of application number CN200610017265.8 is a kind of multifunction degradable liquid ground film and preparation method thereof.This invention utilizes the degradability of Z 150PH and starch, the water-retentivity of XPA, and synthetic a kind of starch-based polymer behind the products therefrom dilute with water, can spray film forming.Their technology has solved a part of problem, but exists serious deficiency, and mainly show as: (1) use properties still is inferior to the conventional plastic mulch film; The use properties of liquid ground film remains further to be improved as doing wet tenacity, tensile strength, elongation at break, the intensity of the back liquid ground film that particularly rains problem such as decline to a great extent.(2) liquid ground film material usage problem is not resolved, and the very few film-formation result of consumption is poor, even does not have the water-retaining effect effect; Consumption is too big, and be prone to form gelatinoid and stop up shower nozzle, and the cost raising, cause waste.(3) water-absorbent is poor, does not have water storage property, and it is bigger that difficulty is promoted in the dry.(4) film forming is short period, and is relatively poor to the later stage drought resisting effect of plant, and, there is not toughness after the film forming, cause face of land easy of crack.
China is the big country of paper industry; To from plant, isolate about 1.4 hundred million tons of Mierocrystalline celluloses every year, obtain the xylogen sub product about 5,000 ten thousand tons simultaneously, but up to now; Surpass 50% xylogen still directly enter rivers with " waste liquid " or concentrate after burn, seldom be utilized effectively.The pollution that the sewage of papermaking is serious arable land, river and underground water, cause very big harm for people's living environment, the heavy burden that has been processed into enterprise of papermaking wastewater is arranged phenomenon steathily and is happened occasionally for practicing thrift cost.Papermaking wastewater utilized again help environmental protection, energy-saving and emission-reduction, turn waste into wealth is the direction that enterprise makes great efforts to seek always, is that country actively supports the project given special assistance to.
Summary of the invention
In order to solve the problem that existing mulch film exists, the objective of the invention is: the biological degradation liquid film and the method for manufacture thereof that provide a kind of papermaking wastewater to produce; Utilize papermaking wastewater to produce biological degradation liquid film, both save energy reduced cost, and helped environmental protection again.With paper industry waste liquid papermaking wastewater (the essential substance xylogen also has polysaccharide, natural phenolic etc.), starch, Z 150PH, acrylic or methacrylic acid or acrylic amide, vinylformic acid pentyl ester or Octyl acrylate and formaldehyde or LUTARALDEHYDE or oxalic dialdehyde etc. is raw material; Through to the grafting of xylogen propenyl, the grafting of starch acrylamide base; Series of chemical such as xylogen, starch, polyoxyethylene glycol hydroxyl and aldehyde radical condensation, crosslinked, copolymerization; Synthetic a kind of xylogen is the water-soluble polymers of primary standard, is biological degradation liquid film.
Technical scheme of the present invention in order to achieve the above object is: biological degradation liquid film and method of manufacture thereof that a kind of papermaking wastewater is produced;
Its raw material comprises:
Principal reaction base-material: papermaking wastewater;
Other react base-material: starch, Z 150PH;
Graft modification agent: vinylformic acid or methylacrylic acid and vinylformic acid pentyl ester or Octyl acrylate or acrylic amide;
Initiator: ammonium persulphate or Potassium Persulphate and sodium sulfite anhy 96;
Linking agent: LUTARALDEHYDE or oxalic dialdehyde, or formaldehyde;
Neutralizing agent: sodium hydroxide or Pottasium Hydroxide or ammoniacal liquor;
Water: softening water.
Its raw material specification is following:
Its proportioning umber is following:
The principal reaction base-material is 8～12% (folding solids content 100% butt meters), and the principal reaction base-material is meant waste papermaking straw pulp liquor and reed pulp papermaking wastewater mixed solution, or wherein a kind of;
Other reaction base-materials are 6～10%, and other reaction base-materials are meant the mixture of starch, Z 150PH, or wherein a kind of;
The graft modification agent is 4～8%, and the graft modification agent is vinylformic acid, methylacrylic acid and n-Amyl acetate, Octyl acrylate, acrylic amide mixture, or wherein a kind of, or several kinds mixture;
Initiator is 0.02～0.5%, and initiator is the wherein a kind of of sodium sulfite anhy 96 and ammonium persulphate, Potassium Persulphate;
Linking agent is 0.2～1.5%, linking agent be LUTARALDEHYDE, oxalic dialdehyde, wherein a kind of of formaldehyde;
Neutralizing agent is 3～6% (folding solids content 100% butt meters), and neutralizing agent is the wherein a kind of of sodium hydroxide, Pottasium Hydroxide, ammoniacal liquor;
Water supplies 100%, and supplying institute's water is softening water.
Its method of manufacture of biological degradation liquid film that a kind of papermaking wastewater of the present invention is produced is following: at first in principal reaction base-material and other reactive group material mixtures, add graft modification agent, initiator, carry out graft modification, the material after the graft modification; Add linking agent again in the material after graft modification and carry out condensation, crosslinked, copolyreaction; Add neutralizing agent at last and carry out neutralization reaction, can make a kind of have a large amount of carboxyls, hydroxyl, carboxamido-group etc. a large amount of hydrophilic radical, that submissive group is long-chain ester based, mutually netted wear knit 3 D cross-linked, suitably the macromolecule filming material of molecular weight is the biodegradable liquid ground film of agent structure.
Concrete method of manufacture of the present invention, reactions step and technology are following:
(1) gets the principal reaction base-material (papermaking wastewater) that the quality proportioning is 8～12% (folding solids content 100% butt meters); Put into reaction kettle; Under stirring condition, adding the quality proportioning is 6～10% other reaction base-materials (referring to the mixture of starch, Z 150PH or wherein a kind of), adds an amount of softening water; Be heated to 60～90 ℃, stir insulation 30 minutes;
(2) continuation stirring and adding quality proportioning are 4～8% graft modification agent (vinylformic acid, methylacrylic acid and n-Amyl acetate, Octyl acrylate, acrylic amide mixture; Or it is wherein a kind of); The quality proportioning is 0.02～0.5% initiator (sodium sulfite anhy 96, ammonium persulphate, a Potassium Persulphate etc. any one), stirring reaction 4 hours; Add the quality proportioning then and be 0.2～1.5% linking agent (LUTARALDEHYDE, oxalic dialdehyde, formaldehyde etc. any one), stirring reaction 30 minutes is cooled to room temperature;
(3) continue to stir and add the neutralizing agent that the quality proportioning is 3～6% (folding solids content 100% butt meters) (sodium hydroxide, Pottasium Hydroxide, ammoniacal liquor etc. any one) neutralization.
Method of use:
In the biological degradation liquid film of 1 mass parts, the water that adds the 40-80 mass parts dilutes, then; Through spray method, be sprayed on the field after the seeding crops, after the sprinkling; Film formation time keeps being not less than 24 hours, during guarantee no heavy rain and irrigation, can not trample.
Beneficial effect of the present invention
(1) is main raw material to measure big trade effluent papermaking wastewater, turns waste into wealth, reduced the pollution of papermaking wastewater, reduced cost again, improved agriculture production environment simultaneously, quickened to eliminate white pollution, help big area and promote.
(2) participate in polymerization again after having the grafting agent modification of absorbent function, water retention property is improved greatly, and have stronger absorbent function and water storage function, therefore can practice thrift irrigation water.
(3) increased water-fast erosion, film forming is soft, and is flexible, and the face of land is not easy cracking, has improved the later stage drought resisting effect of plant.
When (4) crop emerges, can emerge naturally, without artificial seedling setting, saving of work and time; Can improve 1～6 ℃ of ground temperature.
(5) after for some time, plough under in the soil, stronger adhesive capacity is arranged, can grogs be coupled to the ideal coacervate, improve the boundary of capillarity of soil particle, improve soil permeability, become soil improvement agent; Can and carry secretly with generation complexings such as fertilizer, agricultural chemicals, plant growth hormones, plant probioticss.And the effect with slowly-releasing, increase effect, can improve crop yield 5%～56.7%.
Embodiment:
Embodiment 1
It is following that the quality of present embodiment is joined umber:
The principal reaction base-material is 8% (folding solids content 100% butt meter), and the principal reaction base-material is meant waste papermaking straw pulp liquor, and what waste papermaking straw pulp liquor was used is wheat straw grass papermaking wastewater, solids content 12%;
Other reaction base-materials are 8%, and other reaction base-materials are meant the mixture of 4% starch, 4% Z 150PH;
The graft modification agent is 6%, and the graft modification agent is 4% vinylformic acid, 1% Octyl acrylate, 1% acrylic amide mixture;
Initiator is 0.1%, and initiator is sodium sulfite anhy 96 and Potassium Persulphate, and the ratio of sodium sulfite anhy 96 and Potassium Persulphate is 1: 1;
Linking agent is 0.25%, and linking agent is a LUTARALDEHYDE;
Neutralizing agent is 3% (folding solids content 100% butt meter), and neutralizing agent is a sodium hydroxide;
Water supplies 100%, and supplying institute's water is softening water.
All raw material quality proportioning sums are 100%
The reactions step and the concrete operations of present embodiment are following:
(1) (the principal reaction base-material is meant waste papermaking straw pulp liquor to get quality proportioning the be 8% principal reaction base-material of (folding solids content 100% butt meter); What black liquid of straw pulp paper-making was used is wheat straw grass papermaking wastewater, solids content 12%), under stirring condition; Adding the quality proportioning is 8% other reaction base-materials (other reaction base-materials are meant the mixture of 4% starch, 4% Z 150PH); Add and remove softening water in right amount, be heated to 80 ℃, stir insulation 30 minutes;
(2) under stirring condition; (initiator is sodium sulfite anhy 96 and Potassium Persulphate to add the quality proportioning and be 6% graft modification agent (the graft modification agent is 4% vinylformic acid, 1% Octyl acrylate, 1% acrylic amide mixture) quality proportioning and be 0.1% initiator; The ratio of sodium sulfite anhy 96 and Potassium Persulphate is 1: 1), stirring reaction 4 hours; Add the quality proportioning then and be 0.25% linking agent (linking agent is a LUTARALDEHYDE), stirring reaction 30 minutes is cooled to room temperature;
(3) under stirring, refrigerative condition, adding the quality proportioning is the neutralizing agent (neutralizing agent is a sodium hydroxide) of 3% (folding solids content 100% butt meter), after the neutralization, promptly makes biological degradation liquid film of the present invention.
Embodiment 2
The quality proportioning umber of present embodiment is following:
The principal reaction base-material is 10% (folding solids content 100% butt meter), and the principal reaction base-material is meant the reed pulp papermaking wastewater, and what the reed pulp papermaking wastewater was used is the reed papermaking wastewater, solids content 12%;
Other reaction base-materials are 6%, and other reaction base-materials are meant the mixture of 2% starch, 4% Z 150PH;
The graft modification agent is 8%, and the graft modification agent is the mixture of 6% vinylformic acid, 2% Octyl acrylate;
Initiator is 0.05%, and initiator is sodium sulfite anhy 96 and Potassium Persulphate, and the ratio of sodium sulfite anhy 96 and Potassium Persulphate is 1: 1;
Linking agent is 0.5%, and linking agent is a formaldehyde;
Neutralizing agent is 5% (folding solids content 100% butt meter), and neutralizing agent is a Pottasium Hydroxide;
Water supplies 100%, and water is softening water.
The reactions step and the concrete operations of present embodiment are following:
(1) (the principal reaction base-material is meant the reed pulp papermaking wastewater to get quality proportioning the be 10% principal reaction base-material of (folding solids content 100% butt meter); What the reed pulp papermaking wastewater was used is the reed papermaking wastewater, solids content 12%), under stirring condition; Adding the quality proportioning is 6% other reaction base-materials (other reaction base-materials are meant the mixture of 2% starch, 4% Z 150PH); Add and remove softening water in right amount, be heated to 85 ℃, stir insulation 30 minutes;
(2) under stirring condition; (initiator is sodium sulfite anhy 96 and Potassium Persulphate to add the quality proportioning and be 8% graft modification agent (the graft modification agent is the mixture of 6% vinylformic acid, 2% Octyl acrylate) quality proportioning and be 0.05% initiator; The ratio of sodium sulfite anhy 96 and Potassium Persulphate is 1: 1), stirring reaction 4 hours; Add the quality proportioning then and be 0.5% linking agent (linking agent is a LUTARALDEHYDE), stirring reaction 30 minutes is cooled to room temperature;
(3) under stirring, refrigerative condition, adding the quality proportioning is the neutralizing agent (neutralizing agent is a Pottasium Hydroxide) of 5% (folding solids content 100% butt meter), after the neutralization, promptly makes biodegradable liquid ground film of the present invention.
The land for growing field crops performance test of liquid ground film
1, the land for growing field crops of liquid ground film of the present invention heats effect
Table 1 liquid ground film is to the influence of ground temperature constantly of face of land 5cm place
| Time | 8:00 | 10:00 | 12:00 | 14:00 | 16:00 | 18:00 | 20:00 | 22:00 | 0:00 | On average |
| PK(℃) | 5.6 | 8.7 | 11.4 | 15.6 | 16.6 | 14.5 | 9.5 | 6.7 | 5.8 | 10.48 |
| Liquid ground film (℃) | 5.5 | 9.3 | 14.3 | 19.8 | 21.1 | 19.9 | 14.8 | 12.2 | 8.7 | 13.95 |
Can be known that by table 1 face of land 5cm ground temperature temperature constantly demonstrates such rule: the land for growing field crops heat-up rate of jetting liquid mulch film is fast, the height that temperature rises; Radix is big during cooling; Help ground temperature and remain on high-end trim, cooling rate is slower partially than blank, and whole ground temperature is apparently higher than blank land for growing field crops.The mean ground temperature of test constantly of liquid ground film is higher 3.47 ℃ than blank.
2, the land for growing field crops of liquid ground film of the present invention soil moisture conservation effect
According to mensuration result on March 20th, 2009 to April 25,0～5cm topsoil water cut, liquid ground film is handled average out to 22.7%, and contrast average out to 20.1%, the processing comparison is shone and is exceeded 2.6 percentage points, and water cut improves 12.9%.This shows that liquid ground film has good effect to the water cut that keeps earth on the land for growing field crops.
3, liquid ground film of the present invention rainproof scouring effect
According to the record in experimental plot, rained heavily 3 times during August 2 to September 19 in 2009, total rainfall amount is about about 200mm.Measured the result from August 3 and see, the face of land net flow of using liquid ground film of the present invention to cover processing is lost the heavy 0.110kg of dry ground, and contrast is 1.375kg, and the rainproof scouring effect of this liquid ground film is fairly obvious.
Use in the land for growing field crops of liquid ground film of the present invention
1, the effect on watermelon
Three official Miao Wu villages, Zhongmou County, Zhengzhou, liquid ground film of the present invention Henan are following in the application in watermelon land for growing field crops: on April 23rd, 2009; Behind the growth of watermelon, the soil temperature of covering liquid ground film of the present invention, psychromatic ratio not soil temperature, the humidity of covering with plastic film want high, and wherein April, ground temperature was high 1.82 ℃; May is high 2.45 ℃; June is high 2.58 ℃, and July is high 3.06 ℃, and soil moisture content is high by 10.33%.This explanation, the soil moisture high humidity that covers with this liquid ground film is big, is fit to growing of watermelon seedling.The growth of watermelon seedling is very fast, not excessive growth in early stage, and female flower is early concentrated, not early ageing of later stage, growth is sane, stretches 8 days climing morning, and beginning flower early 5 days was contained flower early 6 days.The unit surface (100m2) that wherein covers this liquid ground film goes up The yield of watermelon 699.0kg than the output 618.0kg raising the output 81.0kg that covers the water white transparency mulch film, and The yield of watermelon is apparently higher than the contrast plot.
2, the effect on soybean
The test in land for growing field crops, San He village, four trees township, Baicheng City Daan City is following in Jilin:
Average yield per mu 191.35kg compared according to the every mu of raising the output in field 42.1kg 22.5 mu of ground uses in 2008;
Average yield per mu 201.4kg compared according to the every mu of raising the output in field 42.3kg 48.5 mu of ground uses in 2009.
The use of liquid-state mulch film can effectively reduce soybean disease, worm harm, and (20.22g increases to 23,73g), improves soybean quality, strengthens the competitive power in market to increase 100-grain weight.
Biological degradation liquid film of the present invention is a main raw material with the papermaking wastewater, has reduced the pollution of papermaking wastewater, has reduced product cost again; Improve agriculture production environment, eliminated white pollution; Use in the field played well preserve moisture, insulation effect, can practice thrift irrigation water, improve crop yield; Its big area is promoted, and will play active effect to the increases in grain production of China.
Claims (6)
1. the papermaking wastewater biological degradation liquid film and the method for manufacture thereof of producing, its composition of raw materials is following:
Principal reaction base-material: papermaking wastewater;
Other react base-material: starch, Z 150PH;
Graft modification agent: vinylformic acid or methylacrylic acid and vinylformic acid pentyl ester or Octyl acrylate or acrylic amide;
Initiator: ammonium persulphate or Potassium Persulphate and sodium sulfite anhy 96;
Linking agent: LUTARALDEHYDE or oxalic dialdehyde, or formaldehyde;
Neutralizing agent: sodium hydroxide or Pottasium Hydroxide or ammoniacal liquor;
Water: softening water.
2. its raw material specification of biological degradation liquid film that a kind of papermaking wastewater as claimed in claim 1 is produced is following:
3. its proportioning umber of biological degradation liquid film that a kind of papermaking wastewater as claimed in claim 1 is produced is following: the principal reaction base-material is 8～12% (folding solids content 100% butt meters); The principal reaction base-material is meant waste papermaking straw pulp liquor and reed pulp papermaking wastewater mixed solution, or wherein a kind of;
Other reaction base-materials are 6～10%, and other reaction base-materials are meant the mixture of starch, Z 150PH, or wherein a kind of; The graft modification agent is 4～8%, and the graft modification agent is vinylformic acid, methylacrylic acid and n-Amyl acetate, Octyl acrylate, acrylic amide mixture, or wherein a kind of, or several kinds mixture;
Initiator is 0.02～0.5%, and initiator is the wherein a kind of of sodium sulfite anhy 96 and ammonium persulphate, Potassium Persulphate;
Linking agent is 0.2～1.5%, linking agent be LUTARALDEHYDE, oxalic dialdehyde, wherein a kind of of formaldehyde;
Neutralizing agent is 3～6% (folding solids content 100% butt meters), and neutralizing agent is the wherein a kind of of sodium hydroxide, Pottasium Hydroxide, ammoniacal liquor;
Water supplies 100%, and supplying institute's water is softening water.
4. the biological degradation liquid film produced of a papermaking wastewater; Its method of manufacture is: at first in principal reaction base-material and other reactive group material mixtures, add graft modification agent, initiator, carry out graft modification, the material after the graft modification; Add linking agent again in the material after graft modification and carry out condensation, crosslinked, copolyreaction; Add neutralizing agent at last and carry out neutralization reaction, can make a kind of have a large amount of carboxyls, hydroxyl, carboxamido-group etc. a large amount of hydrophilic radical, that submissive group is long-chain ester based, mutually netted wear knit 3 D cross-linked, suitably the macromolecule filming material of molecular weight is the biodegradable liquid ground film of agent structure.
5. the biological degradation liquid film that a kind of papermaking wastewater as claimed in claim 4 is produced; The concrete reactions step of its method of manufacture is following:
(1) gets the principal reaction base-material (papermaking wastewater) that the quality proportioning is 8～12% (folding solids content 100% butt meters); Put into reaction kettle; Under stirring condition, adding the quality proportioning is 6～10% other reaction base-materials (referring to the mixture of starch, Z 150PH or wherein a kind of), adds an amount of softening water; Be heated to 60～90 ℃, stir insulation 30 minutes;
(2) continuation stirring and adding quality proportioning are 4～8% graft modification agent (vinylformic acid, methylacrylic acid and n-Amyl acetate, Octyl acrylate, acrylic amide mixture; Or it is wherein a kind of); The quality proportioning is 0.02～0.5% initiator (sodium sulfite anhy 96, ammonium persulphate, a Potassium Persulphate etc. any one), stirring reaction 4 hours; Add the quality proportioning then and be 0.2～1.5% linking agent (LUTARALDEHYDE, oxalic dialdehyde, formaldehyde etc. any one), stirring reaction 30 minutes is cooled to room temperature;
(3) continue to stir and add the neutralizing agent that the quality proportioning is 3～6% (folding solids content 100% butt meters) (sodium hydroxide, Pottasium Hydroxide, ammoniacal liquor etc. any one) neutralization.
6. its method of use of biological degradation liquid film like claim 1 or 4 described a kind of papermaking wastewater productions is: in the biological degradation liquid film of 1 mass parts, the water that adds the 40-80 mass parts dilutes, then; Pass through spray method; Be sprayed on the field after the seeding crops, after the sprinkling, film formation time keeps being not less than 24 hours; Guarantee no heavy rain and irrigation during this time, can not trample.
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| CN2011101401392A CN102337138A (en) | 2011-05-27 | 2011-05-27 | Biodegradable liquid mulch film produced from papermaking waste liquid, and production method thereof |
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| CN2011101401392A CN102337138A (en) | 2011-05-27 | 2011-05-27 | Biodegradable liquid mulch film produced from papermaking waste liquid, and production method thereof |
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| CN113801348A (en) * | 2021-09-29 | 2021-12-17 | 华南理工大学 | Liquid mulching film and preparation method thereof |
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| WO2018182543A3 (en) * | 2017-03-29 | 2019-03-21 | Scg Packaging Public Company Limited | Soil covering material having structural layers |
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| CN109180971B (en) * | 2018-07-17 | 2020-12-15 | 江西威骏科技股份有限公司 | Water-retaining environment-friendly lignin-starch-kenaf composite mulching film and preparation method thereof |
| CN109197283A (en) * | 2018-09-08 | 2019-01-15 | 佛山市森昂生物科技有限公司 | A kind of preparation method of degradable water conservation mulch |
| CN113801348A (en) * | 2021-09-29 | 2021-12-17 | 华南理工大学 | Liquid mulching film and preparation method thereof |
| CN115368520A (en) * | 2022-08-09 | 2022-11-22 | 南京林业大学 | Sprayable liquid mulching film with weeding function and preparation method thereof |
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