CN101280073B - Agricultural liquid ground cover film, preparation and use method thereof - Google Patents

Abstract

The invention relates to an agricultural liquid ground covering membrane, which is composed of the following components: 20-25wt% of lignin sulfonate, 5-10wt% of modified starch, 2-3wt% of chitin; 3-5wt% of gelatin; 1-2wt% of surfactant; 0.05-0.3 of cross-linker, and 55-65wt% of water, wherein, sodium dodecylbenzenesulfonate is the surfactant optimum; N,N-methylenebisacrylamide is the cross-linker optimum.

Description

Agricultural liquid ground cover film and preparation thereof and using method

Technical field

The invention belongs to the agrochemicals technical field, relate in particular to a kind of agricultural liquid ground cover film and preparation and using method of fully biodegradable.

Background technology

What use was more in the current farmland is plastic film, using plastic film can satisfy farm crop insulation, soil moisture conservation, keep the needs of fertility, increasing both production and income, this has brought certain benefit for production and the high yield of crop, but the side effect that a large amount of use produced of plastic film in agriculture production is also quite huge, has caused the great attention of national correlation department and the public's extensive concern.Plastic film is to be made by polyethylene or polystyrene etc., has non-degradable, is difficult to reclaim and recycling, so that environmental health is constituted harm, produces a large amount of secondary pollutions.The mulch film fragment that remains in the soil causes Soil structure to worsen after accumulation for many years, and crop root stretches and is restricted, and soil salt content rolls up, and crop is serious from malicious phenomenon, directly has influence on crop yield and quality.In addition, when using plastic film, also need artificial rupture of membrane, time-consuming, thus bring the high shortcoming of use cost.Therefore, development and production can not cause the plastic film substitute of ecological environmental pollution imperative, are the developing direction of the future of agriculture yet.

To this, there are many Chinese patents to carry out big quantity research for the correlation technique that substitutes above-mentioned plastic film, be 98100450.4 for example at application number, 02108889.6,02121393.3,200610017265.8,200610017627.3,200610017628.8,200710056353.3 Deng the Chinese patent application file in various liquid plastics mulch films are all disclosed, but these plastic films overwhelming majority part contains polyolefine or polyvinyl alcohol, and polyolefine or polyvinyl alcohol also are the petroleum derivation product, be difficult for decomposing, life-time service can damage to soil, cause soil compaction and toxigenicity, so be difficult to promote the use of.Though at application number is that disclosed liquid ground film does not contain polyolefine or polyvinyl alcohol in 02121393.3 and 200710066872.8 the Chinese patent application file, be that disclosed liquid ground film is through mixing by xylogen, chitosan, collagen protein, tensio-active agent and whipping agent in 02121393.3 the patent application document for example at application number, this mulch film can be avoided the disadvantage of plastic film, but this mulch film manufacturing cost is higher, also be difficult to promote the use of, and its effectiveness that is incubated, preserves soil moisture is relatively poor.

The inventor has carried out deep research to this, but outcome research goes out a kind of fully bio-degradable, and manufacturing cost is relatively low, the insulation soil moisture conservation is renderd a service good liquid plastics ground cover film, thereby finished the present invention.

Summary of the invention

But purpose of the present invention just provides a kind of fully bio-degradable, and manufacturing cost is relatively low, and good agricultural liquid plastics ground cover film is renderd a service in the insulation soil moisture conservation, and the method for manufacture and use thereof of this agricultural liquid plastics ground cover film is provided simultaneously.

More particularly, agricultural liquid ground cover film of the present invention is made up of following component: (each component concentration calculates with weight percentage)

Sodium lignosulfonate: 20-25%;

Modified starch: 5-10%;

Chitin: 2-3%;

Gelatin: 3-5%;

Tensio-active agent: 1-2%;

Linking agent: 0.05-0.3%; With

Water: 55-65%.

Wherein, tensio-active agent is preferably Sodium dodecylbenzene sulfonate, and linking agent is preferably N,N methylene bis acrylamide.

On the other hand, the present invention further provides the novel preparation method of aforesaid liquid ground cover film.

The preparation method of liquid ground cover film of the present invention is as follows:

At first, take by weighing starting material, chitin and the gelatin that accounts for gross weight 2-3% and 3-5% respectively is mixed with mixed solution by above-mentioned weight proportion; The sodium lignosulfonate that accounts for gross weight 20-25% is dispersed in the water, fully stir evenly, add again account for gross weight 5-10% modified starch in the lignosulfonic acid sodium solution, under 50-100 ℃ of condition, gelatinization 30-45 minute, become transparent heavy-gravity starch paste, add the chitin and the mixed solution of gelatin prepare in advance then, last adding again accounts for the tensio-active agent of gross weight 1-2%, and adjust pH is 2-4, add the linking agent that accounts for gross weight 0.05-0.3%, at 50 ℃ of down logical N ₂Stir polymerization 2 hours, can obtain agricultural degradable liquid ground cover film of the present invention.

Wherein, gelatinization point is preferably 60-90 ℃.

Wherein, tensio-active agent is preferably Sodium dodecylbenzene sulfonate, and linking agent is preferably N,N methylene bis acrylamide.

In addition, the present invention also further provides the using method of aforesaid liquid ground cover film, and this method comprises 3 times of gained liquid ground cover film thin ups, directly is sprayed on the soil surface filming with common sprayer.

Liquid ground cover film of the present invention has following advantage:

1) raw materials for production of the present invention are easy to get and easily purchase, and are biodegradable raw material, can be degraded to the humic acids organic fertilizer basically after 2 months, effective activating soil, improve soil physical property, avoid secondary pollution, thereby lay the foundation for crop yield increases income;

2) square science is careful and precise careful, and product performance are stable;

3) usefulness method is easy, gets final product with conventional atomizers spray.After spraying, crop can be broken through the soil voluntarily, need not artificial seedling setting, thereby reduces labor intensity, and reduces production costs.

4) insulation, water conservation, soil moisture conservation effective can improve crop yield 30-50% after the use.

Embodiment

Embodiment 1: 6 gram chitins, 10 gram gelatin are joined in the 50 gram water be mixed with mixed solution; 40 gram sodium lignosulfonates are dispersed in the 70 gram water, fully stir evenly, add 20 gram modified starches again in solution, under 90 ℃ of conditions, gelatinization 45 minutes becomes transparent heavy-gravity starch paste, adds the chitin prepare in advance and the mixed solution of gelatin then, at last, 4 gram Sodium dodecylbenzene sulfonatees are added in the blended aqueous solution.Adjust pH is 4, adds 0.1 gram N,N methylene bis acrylamide, at 50 ℃ of down logical N ₂Stir polymerization 2 hours, obtain a kind of agricultural degradable liquid mulch film.

Embodiment 2: 4 gram chitins, 6 gram gelatin are joined in the 40 gram water be mixed with mixed solution; 50 gram sodium lignosulfonates are dispersed in the 88 gram water, fully stir evenly, add 10 gram modified starches again in solution, under 78 ℃ of conditions, gelatinization 40 minutes becomes transparent heavy-gravity starch paste, adds the chitin prepare in advance and the mixed solution of gelatin then, at last, 2 gram Sodium dodecylbenzene sulfonatees are added in the blended aqueous solution.Adjust pH is 2, adds 0.2 gram N,N methylene bis acrylamide, at 45 ℃ of down logical N ₂Stir polymerization 1.5 hours, obtain a kind of agricultural degradable liquid mulch film.

Embodiment 3: 6 gram chitins, 8 gram gelatin are joined in the 45 gram water be mixed with mixed solution; 50 gram sodium lignosulfonates are dispersed in the 73 gram water, fully stir evenly, add 15 gram modified starches again in solution, under 80 ℃ of conditions, gelatinization 40 minutes becomes transparent heavy-gravity starch paste, adds the chitin prepare in advance and the mixed solution of gelatin then, at last, 3 gram Sodium dodecylbenzene sulfonatees are added in the blended aqueous solution.Adjust pH is 3, adds 0.4 gram N,N methylene bis acrylamide, at 40 ℃ of down logical N ₂Stir polymerization 1 hour, obtain a kind of agricultural degradable liquid mulch film.

Embodiment 4: 5 gram chitins, 7 gram gelatin are joined in the 50 gram water be mixed with mixed solution; 45 gram sodium lignosulfonates are dispersed in the 79 gram water, fully stir evenly, add 10 gram modified starches again in solution, under 85 ℃ of conditions, gelatinization 45 minutes becomes transparent heavy-gravity starch paste, adds the chitin prepare in advance and the mixed solution of gelatin then, at last, 4 gram Sodium dodecylbenzene sulfonatees are added in the blended aqueous solution.Adjust pH is 3, adds 0.2 gram N,N methylene bis acrylamide, at 50 ℃ of down logical N ₂Stir polymerization 2 hours, obtain a kind of agricultural degradable liquid mulch film.

Embodiment 5: 5 gram chitins, 8 gram gelatin are joined in the 44 gram water be mixed with mixed solution; 45 gram sodium lignosulfonates are dispersed in the 80 gram water, fully stir evenly, add 16 gram modified starches again in solution, under 75 ℃ of conditions, gelatinization 35 minutes becomes transparent heavy-gravity starch paste, adds the chitin prepare in advance and the mixed solution of gelatin then, at last, 4 gram Sodium dodecylbenzene sulfonatees are added in the blended aqueous solution.Adjust pH is 4, adds 0.6 gram N,N methylene bis acrylamide, at 45 ℃ of down logical N ₂Stir polymerization 1.5 hours, obtain a kind of agricultural degradable liquid mulch film.

Comparative example 1 (adding an amount of polyvinyl alcohol, 200710056353.3)

Get the amidin of 200 gram 5wt%, stir gelatinization 30min down, become transparent heavy-gravity starch paste at 75 ℃.The polyvinyl alcohol water solution that adds 500 gram 10wt% then, the aqueous solution of the carboxymethyl cellulose of 250 gram 8wt%, add 2.5 gram polyoxyethylene mono-laurates, add 5 gram glycerol, regulating the pH value is 2, add 10 gram formaldehyde down 85 ℃ of temperature, reacted 2 hours, obtain a kind of biological degradation liquid film.

The comparative example 2 (02121393.3)

Lignin liquor with 90%, (wherein containing 2% linking agent formaldehyde), 3% chitosan, 6% collagen protein, each tensio-active agent, whipping agent of 0.5% are made liquid mixture.Be housed in the jar special.

Biological Examples 1

Application process: add 3 times in water, sparge in the peanut ground through spray method

Embodiment 4	85	100	40％	1945
					Embodiment 5	91	100	38％	1950
The comparative example 1	50	80	20％	2140
					The comparative example 2	75	90	15％	2200

Be not difficult to find by above contrast, liquid plastics ground cover film biological degradation rate height of the present invention, non-secondary pollution, and also crop yield is obvious, and cost is lower, has extraordinary promotional value.

Claims (6)

1. the preparation method of agricultural liquid ground cover film, it is characterized in that: the chitin that accounts for gross weight 2-3% respectively is mixed with mixed solution with the gelatin that accounts for gross weight 3-5%, the sodium lignosulfonate that accounts for gross weight 20-25% is dispersed in the water, fully stir evenly, add again and account for the modified starch of gross weight 5-10% in the lignosulfonic acid sodium solution, under 50-100 ℃ of condition, gelatinization 30-45 minute, become transparent heavy-gravity starch paste, add the chitin and the mixed solution of gelatin prepare in advance then, last adding again accounts for the tensio-active agent of gross weight 1-2%, and adjust pH is 2-4, add the linking agent that accounts for gross weight 0.05-0.3%, at 50 ℃ of down logical N ₂Stir polymerization 2 hours, can obtain described agricultural liquid ground cover film.

2. the preparation method of agricultural liquid ground cover film according to claim 1, it is characterized in that: gelatinization point is 70-90 ℃.

3. the preparation method of agricultural liquid ground cover film according to claim 1 and 2 is characterized in that tensio-active agent is a Sodium dodecylbenzene sulfonate, and linking agent is a N,N methylene bis acrylamide.

4. an agricultural liquid ground cover film is characterized in that this agricultural liquid ground cover film is grouped into by following one-tenth, and wherein each component concentration calculates with weight percentage:

Sodium lignosulfonate: 20-25%;

Modified starch: 5-10%;

Chitin: 2-3%;

Gelatin: 3-5%;

Tensio-active agent: 1-2%;

Linking agent: 0.05-0.3%; With

Water: 55-65%.

5. agricultural liquid ground cover film according to claim 4 is characterized in that tensio-active agent is a Sodium dodecylbenzene sulfonate, and linking agent is a N,N methylene bis acrylamide.

6. according to the using method of claim 4 or 5 described agricultural liquid ground cover films, it is characterized in that:, directly be sprayed on the soil surface filming with common sprayer and get final product 3 times of gained liquid ground cover film thin ups.