CN107987847B - Environment-friendly garden organic covering composition - Google Patents
Environment-friendly garden organic covering composition Download PDFInfo
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- CN107987847B CN107987847B CN201711274593.0A CN201711274593A CN107987847B CN 107987847 B CN107987847 B CN 107987847B CN 201711274593 A CN201711274593 A CN 201711274593A CN 107987847 B CN107987847 B CN 107987847B
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Abstract
The invention provides an environment-friendly garden organic covering composition, which comprises the following components in parts by weight: 30-50 parts of garden waste, 1-15 parts of honeycomb activated carbon, 5-20 parts of zeolite particles, 2-10 parts of binder, 3-15 parts of modified chitosan, 10-30 parts of matrix material and 10-30 parts of water; the modified chitosan is chitosan grafted biquaternary ammonium salt containing imidazole heterocycle, and the preparation raw materials of the matrix material comprise PLGA, ferroferric oxide, polyvinyl alcohol, agarose, cellulase and farnesol; the raw materials for preparing the adhesive comprise ethylene-vinyl acetate copolymer, polyvinyl alcohol, nonionic surfactant, anionic surfactant, antiseptic bactericide and water.
Description
Technical Field
The invention relates to the technical field of garden planting, in particular to an environment-friendly garden organic covering composition.
Background
In recent decades, the interference and influence of human activities on the natural environment cause climate abnormity, water and soil loss and water resource shortage in the world, which are long-term troubles for human living environment. In the last decade, the condition of the south waterlogging and the north drought of China is aggravated, and the frequent occurrence of disastrous climate is related to the deterioration of the natural environment. Meanwhile, the country is gradually powerful, the urbanization degree is higher and higher, people have higher requirements on the living environment, but large-area shrubs and lawns in urban gardens consume serious water, so that 'water-saving gardens' are imperative.
The ground surface coverings used in urban landscaping are mainly divided into two types, one is an inorganic covering, and the other is called an organic covering. The inorganic covering is mainly ceramsite, plastic sheet, gravel, cobblestone, non-woven fabric and the like, the material cost is low, and the inorganic covering is not easy to rot, so that the ventilation of soil is deteriorated after the inorganic covering is frequently used, and the growth of trees is influenced. The variety of organic ground cover is very large and any part of the plant can be used for the production of cover, such as bark, branches, pine needles, leaves, roots, etc., but with a little treatment. The organic covering is an ideal soil protection layer, covers the surface layer of the soil and can adjust the temperature of the soil. Both can shelter from the burning sun and insolate, avoid soil temperature to continuously rise, can form the heat preservation again when weather is cold, preserve soil heat, reduce the injury of extreme soil temperature to the root system. The organic covering also has the capacity of maintaining soil humidity, can effectively maintain soil moisture, reduces the amplitude of soil humidity change, and plays a role in saving water and retaining water.
Organic mulch (plant mulch) is used for treating bare ground, improving landscape effect and improving soil fertility, and is popular in Europe and America for many years, but because the organic mulch is a product obtained by crushing waste wood, the organic mulch causes the waste wood to fly due to strong wind in some areas, and the like.
Therefore, the invention provides an environment-friendly garden organic covering composition, which can effectively maintain soil moisture, regulate temperature, improve soil physicochemical property, strengthen soil microbial activity, regulate soil water, fertilizer, gas and heat conditions, improve soil fertility, overcome organic covering dust or secondary dust emission and achieve the effect of beautifying the environment.
Disclosure of Invention
In order to solve the above problems, the first aspect of the present invention provides an environment-friendly garden organic covering composition, comprising, by weight:
the modified chitosan is chitosan grafted biquaternary ammonium salt containing imidazole heterocycle, and the preparation raw materials of the matrix material comprise PLGA, ferroferric oxide, polyvinyl alcohol, agarose, cellulase and farnesol; the raw materials for preparing the adhesive comprise ethylene-vinyl acetate copolymer, polyvinyl alcohol, nonionic surfactant, anionic surfactant, antiseptic bactericide and water.
In one embodiment, the composition comprises, by weight:
in one embodiment, the raw materials for preparing the biquaternary ammonium salt containing the imidazole heterocycle comprise 1-hydroxyethyl-2-methyl-5-nitroimidazole, epichlorohydrin and dodecyl dimethyl tertiary amine.
In one embodiment, the weight ratio of the 1-hydroxyethyl-2-methyl-5-nitroimidazole to the epichlorohydrin and the dodecyl dimethyl tertiary amine in the biquaternary ammonium salt containing an imidazole heterocycle is 1: (1.2-2): (1.5-2.5).
In one embodiment, the modified chitosan has a weight average molecular weight of 1000-.
In one embodiment, the raw materials for preparing the adhesive comprise, by weight, 30-35 parts of ethylene-vinyl acetate copolymer, 0.5-2 parts of polyvinyl alcohol, 0.5-1 part of nonionic surfactant, 0.2-0.5 part of anionic surfactant, 0.1-0.5 part of antiseptic bactericide and 50-60 parts of water.
In one embodiment, the nonionic surfactant comprises one or more of OP series surfactants, NP series surfactants, Tween series surfactants.
In one embodiment, the anionic surfactant comprises one or more of sodium dodecylbenzene sulfate, sodium dodecylbenzene sulfonate, sodium hexadecylbenzene sulfate, and lauric acid sulfate.
In one embodiment, the garden waste comprises one or more of leaves, bark, wood chips, pine needles, walnut shells.
The invention also provides a preparation method of the environment-friendly garden organic covering composition, which comprises the following steps:
(1) collecting garden waste, drying the garden waste in the sun to form dry materials, and crushing the dry materials to form granular materials;
(2) and (2) adding the granular material, the honeycomb activated carbon, the zeolite particles, the binder, the modified chitosan and the matrix material in the step (1) into a stirring device according to the parts by weight, and stirring for 3-5 hours to obtain the environment-friendly garden organic covering composition.
The above-described and other features, aspects, and advantages of the present application will become more apparent with reference to the following detailed description.
Detailed Description
The disclosure may be understood more readily by reference to the following detailed description of preferred embodiments of the invention and the examples included therein. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification, including definitions, will control.
The term "prepared from …" as used herein is synonymous with "comprising". The terms "comprises," "comprising," "includes," "including," "has," "having," "contains," "containing," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.
The conjunction "consisting of …" excludes any unspecified elements, steps or components. If used in a claim, the phrase is intended to claim as closed, meaning that it does not contain materials other than those described, except for the conventional impurities associated therewith. When the phrase "consisting of …" appears in a clause of the subject matter of the claims rather than immediately after the subject matter, it defines only the elements described in the clause; other elements are not excluded from the claims as a whole.
When an amount, concentration, or other value or parameter is expressed as a range, preferred range, or as a range of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted to include the ranges "1 to 4", "1 to 3", "1 to 2 and 4 to 5", "1 to 3 and 5", and the like. When a range of values is described herein, unless otherwise stated, the range is intended to include the endpoints thereof and all integers and fractions within the range.
The singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. "optional" or "any" means that the subsequently described event or events may or may not occur, and that the description includes instances where the event occurs and instances where it does not.
Approximating language, as used herein throughout the specification and claims, is intended to modify a quantity, such that the invention is not limited to the specific quantity, but includes portions that are literally received for modification without substantial change in the basic function to which the invention is related. Accordingly, the use of "about" to modify a numerical value means that the invention is not limited to the precise value. In some instances, the approximating language may correspond to the precision of an instrument for measuring the value. In the present description and claims, range limitations may be combined and/or interchanged, including all sub-ranges contained therein if not otherwise stated.
In addition, the indefinite articles "a" and "an" preceding an element or component of the invention are not intended to limit the number requirement (i.e., the number of occurrences) of the element or component. Thus, "a" or "an" should be read to include one or at least one, and the singular form of an element or component also includes the plural unless the stated number clearly indicates that the singular form is intended.
"Polymer" means a polymeric compound prepared by polymerizing monomers of the same or different types. The generic term "polymer" embraces the terms "homopolymer", "copolymer", "terpolymer" and "interpolymer".
"interpolymer" means a polymer prepared by polymerizing at least two different monomers. The generic term "interpolymer" includes the term "copolymer" (which is generally used to refer to polymers prepared from two different monomers) and the term "terpolymer" (which is generally used to refer to polymers prepared from three different monomers). It also includes polymers made by polymerizing more monomers. "blend" means a polymer formed by two or more polymers being mixed together by physical or chemical means.
The invention provides an environment-friendly garden organic covering composition, which comprises the following components in parts by weight:
the modified chitosan is chitosan grafted biquaternary ammonium salt containing imidazole heterocycle, and the preparation raw materials of the matrix material comprise PLGA, ferroferric oxide, polyvinyl alcohol, agarose, cellulase and farnesol; the raw materials for preparing the adhesive comprise ethylene-vinyl acetate copolymer, polyvinyl alcohol, nonionic surfactant, anionic surfactant, antiseptic bactericide and water.
In one embodiment, the eco-friendly garden organic covering composition comprises, in parts by weight:
preferably, the environment-friendly garden organic covering composition comprises, by weight:
the preparation method of the matrix material comprises the following steps:
(1) preparing PLGA/ferroferric oxide mixed solution: adding PLGA and tetrahydrofuran into a reactor, stirring, adding ferroferric oxide after complete dissolution, and stirring for 0.5 h; the weight ratio of the PLGA to the tetrahydrofuran to the ferroferric oxide is 1: 5: 0.3;
(2) dropwise adding the PLGA/ferroferric oxide mixed solution obtained in the step (1) into a PVA/tetrahydrofuran mixed solution, stirring for 1h after dropwise adding, and removing tetrahydrofuran at 50 ℃ under reduced pressure to obtain PLGA nano microspheres loaded with ferroferric oxide; the weight ratio of the PVA to the ferroferric oxide is 1: 0.12; the weight ratio of the PVA to the tetrahydrofuran in the PVA/tetrahydrofuran mixed solution is 1: 3;
(3) adding the PLGA nano microspheres loaded with ferroferric oxide obtained in the step (2), agarose, deionized water and farnesol into a reactor, stirring for 0.5h, heating to 80 ℃, stirring for 2h, standing, cooling to 30 ℃, adding cellulase, and stirring for 3h to obtain a cellulase mixed solution to be immobilized; the weight ratio of the ferroferric oxide loaded PLGA nano microspheres to the agarose, the deionized water, the farnesol and the cellulase is 1: 0.024: 20: 0.002: 0.05;
(4) adding a calcium chloride aqueous solution into a reactor, stirring, slowly dropwise adding the mixed solution of the cellulase to be immobilized in the step (3), stirring at room temperature for 8 hours after dropwise adding, soaking for 20 hours, filtering and taking out spherical particles, and washing with deionized water to obtain the matrix material, wherein the concentration of the calcium chloride aqueous solution is 0.02g/ml, and the weight ratio of the calcium chloride aqueous solution to the mixed solution of the cellulase to be immobilized is 0.5: 1.
the PVA in the invention is polyvinyl alcohol; the PLGA is polylactic acid-glycolic acid copolymer.
The cellulase has limitations such as poor stability and difficult storage, the stability and catalytic activity of the cellulase are improved by fixing the cellulase through the matrix material, and the catalytic activity of the cellulase is further improved by adding farnesol. In addition, sufficient nutrients are provided for microorganisms in the decomposition process, the activity of soil microorganisms is stimulated, and the decomposition and release of nutrients such as organic substances in the raw materials can be accelerated.
In one embodiment, the raw materials for preparing the biquaternary ammonium salt containing the imidazole heterocycle comprise 1-hydroxyethyl-2-methyl-5-nitroimidazole (CAS:443-48-1), epichlorohydrin and dodecyl dimethyl tertiary amine.
In one embodiment, the weight ratio of the 1-hydroxyethyl-2-methyl-5-nitroimidazole to the epichlorohydrin and the dodecyl dimethyl tertiary amine in the biquaternary ammonium salt containing an imidazole heterocycle is 1: (1.2-2): (1.5-2.5); preferably, the weight ratio of the 1-hydroxyethyl-2-methyl-5-nitroimidazole to the epichlorohydrin and the dodecyl dimethyl tertiary amine in the biquaternary ammonium salt containing the imidazole heterocycle is 1: 1.4: 1.8.
in one embodiment, the modified chitosan has a weight average molecular weight of 1000-; preferably, the weight average molecular weight of the modified chitosan is 2000-3000.
The weight average molecular weight is a value in terms of polystyrene measured by gel permeation chromatography (hereinafter, abbreviated as "GPC"). The measurement conditions of GPC are measured by conditions conventional in the art, and can be measured, for example, in the following manner.
Column: the following columns were connected in series and used.
"TSKgelG 5000" (7.8 mmI.D.. times.30 cm). times.1 roots
"TSKgelG 4000" (7.8 mmI.D.. times.30 cm). times.1 roots
"TSKgelG 3000" (7.8 mmI.D.. times.30 cm). times.1 roots
"TSKgelG 2000" (7.8 mmI.D.. times.30 cm). times.1 roots
A detector: RI (differential refractometer); column temperature: 40 ℃; eluent: tetrahydrofuran; flow rate: 1.0 mL/min; injection amount: 100. mu.L (sample concentration 4mg/mL tetrahydrofuran solution); standard sample: the following monodisperse polystyrene was used to prepare a calibration curve.
The preparation method of the modified chitosan comprises the following steps:
(1) bis-quaternary ammonium salts containing imidazole heterocycle: adding epoxy chloropropane into a reactor, heating to 75 ℃, slowly dropwise adding dodecyl dimethyl tertiary amine, stirring for 0.5h after dropwise adding, cooling to 55 ℃, adding acetonitrile, then adding 1-hydroxyethyl-2-methyl-5-nitroimidazole for 3 times, reacting for 8h while keeping the temperature, cooling to room temperature, concentrating under reduced pressure to obtain a crude product containing imidazole heterocyclic diquaternary ammonium salt, adding acetone, stirring for 0.5h, and concentrating under reduced pressure to obtain the imidazole heterocyclic diquaternary ammonium salt; in the biquaternary ammonium salt containing the imidazole heterocycle, the weight ratio of the 1-hydroxyethyl-2-methyl-5-nitroimidazole to the epichlorohydrin to the dodecyl dimethyl tertiary amine is 1: 1.4: 1.8; the weight ratio of the epichlorohydrin to the acetonitrile to the acetone is 1: 6: 4;
(2) modified chitosan: adding chitosan and 2% acetic acid solution in mass fraction into a reactor, and stirring for 1 hour until the weight ratio of the chitosan to the 2% acetic acid solution is 1: 20, slowly dropwise adding a sodium hydroxide solution with the mass fraction of 10%, adjusting the pH value to 9, continuously stirring for 2h, filtering to obtain alkalized chitosan, adding isopropanol, heating to 60 ℃, carrying out heat preservation reaction for 4h, slowly dropwise adding a biquaternary ammonium salt/water solution, after dropwise adding, heating to 80 ℃, carrying out heat preservation reaction for 10h, cooling to room temperature, adding acetone, filtering, leaching with acetone for 3 times, and drying under reduced pressure at 60 ℃ for 10h to obtain modified chitosan; the weight ratio of the biquaternary ammonium salt to the water in the biquaternary ammonium salt/water solution is 1: 4, the weight ratio of the alkalized chitosan to the isopropanol is 1: 10, the weight ratio of the chitosan to the biquaternary ammonium salt is 1: 0.11.
the chitosan quaternary ammonium salt has good physical and chemical properties, biocompatibility, biodegradability and the like, and the introduction of a quaternary ammonium salt group with large steric hindrance and strong hydration capability relieves the defects of high crystallinity, large brittleness and the like of chitosan, improves the ionic property and greatly increases the electropositivity and the cationic strength of the chitosan quaternary ammonium salt; the chitosan oligosaccharide is a kind of plant immune substances, and has the effects of resisting diseases and low temperature, increasing yield, improving quality and the like of plants.
The quaternary ammonium ions can generate flocculation with negatively charged bacteria, disturb normal life activities of the bacteria and obstruct the replication and reproduction of bacterial DNA, thereby achieving the bacteriostatic and bactericidal effects.
According to the invention, the biquaternary ammonium salt containing imidazole heterocycle is grafted by chitosan, so that the water solubility and the permeability of the 1-ethoxyl-2-methyl-5-nitroimidazole structure can be improved on the basis of not changing the structure, and the slow release performance of the biquaternary ammonium salt is improved after a nitrogen-containing heterocyclic group is introduced, so that the water solubility, the surface activity and the sterilization characteristic of the 1-ethoxyl-2-methyl-5-nitroimidazole can be changed, the stress resistance of garden crops is further improved, the physiological activity of the garden crops is enhanced, and the growth and development of the garden crops are stimulated.
In one embodiment, the raw materials for preparing the adhesive comprise, by weight, 30-35 parts of ethylene-vinyl acetate copolymer, 0.5-2 parts of polyvinyl alcohol, 0.5-1 part of nonionic surfactant, 0.2-0.5 part of anionic surfactant, 0.1-0.5 part of antiseptic bactericide and 50-60 parts of water; preferably, the raw materials for preparing the adhesive comprise 31 parts of ethylene-vinyl acetate copolymer, 0.8 part of polyvinyl alcohol, 0.5 part of nonionic surfactant, 0.3 part of anionic surfactant, 0.2 part of antiseptic bactericide and 50 parts of water; the antiseptic bactericide is 4, 5-dichloro-2-n-octyl-3-isothiazolinone (CAS: 64359-81-5).
The preparation method of the adhesive comprises the following steps:
adding polyvinyl alcohol and water into a reactor according to the parts by weight, stirring and heating to 50 ℃, adding a nonionic surfactant, an ionic surfactant and an ethylene-vinyl acetate copolymer, stirring for 3 hours, cooling to room temperature, adding an anticorrosive bactericide, and stirring for 1 hour to obtain the binder.
In one embodiment, the nonionic surfactant comprises one or more of OP series surfactants, NP series surfactants, Tween series surfactants; preferably, the nonionic surfactant is OP series surfactant, preferably OP-10 in the OP series surfactant, and the surfactant is purchased from OP-10 of the auspicious chemical company in Guangzhou city.
In one embodiment, the anionic surfactant comprises one or more of sodium dodecylbenzene sulfate, sodium dodecylbenzene sulfonate, sodium hexadecylbenzene sulfate, lauric acid sulfate; preferably, the anionic surfactant is sodium dodecylbenzenesulfonate.
In one embodiment, the garden waste comprises one or more of leaves, bark, wood chips, pine needles, walnut shells.
The invention also provides a preparation method of the environment-friendly garden organic covering composition, which comprises the following steps:
(1) collecting garden waste, drying the garden waste in the sun to form dry materials, and crushing the dry materials to form granular materials;
(2) and (2) adding the granular material, the honeycomb activated carbon, the zeolite particles, the binder, the modified chitosan and the matrix material in the step (1) into a stirring device according to the parts by weight, and stirring for 3-5 hours to obtain the environment-friendly garden organic covering composition.
The zeolite and the honeycomb activated carbon are porous materials and have cells on the molecular level, so that the soil can be improved, the soil granular structure can be increased, the water holding capacity and the air permeability of the soil can be improved, the activity of beneficial microorganisms in the soil can be promoted, and the salt content in saline-alkali soil can be reduced; can improve fertilizer efficiency, crop yield, crop quality, stress resistance of garden crops, physiological activity of garden crops, and growth and development of garden crops.
According to the invention, through the synergistic effect of the modified chitosan, the matrix material, the honeycomb activated carbon, the zeolite particles, the binder and the garden waste, the environment-friendly garden organic covering composition effectively keeps soil moisture, adjusts the temperature, improves the physical and chemical properties of soil, strengthens the microbial activity of the soil, adjusts the water, fertilizer, gas and heat conditions of the soil, improves the soil fertility, and overcomes the dust or secondary dust of an organic covering so as to achieve the effect of beautifying the environment.
The covering application of the environment-friendly garden organic covering composition comprises the following steps: the environment-friendly garden organic covering composition is uniformly paved around the base of the trunk, a distance of 6cm is reserved between the edge of the organic covering and the base of the trunk, and the covering thickness is 3-6 cm.
The present invention will be specifically described below by way of examples. It should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and that the insubstantial modifications and adaptations of the present invention by those skilled in the art based on the above disclosure are still within the scope of the present invention.
In addition, the raw materials used are commercially available from national chemical reagents, unless otherwise specified.
Example 1
The environment-friendly garden organic covering composition comprises the following components in parts by weight:
the modified chitosan is chitosan-grafted biquaternary ammonium salt containing imidazole heterocycle, the raw materials for preparing the biquaternary ammonium salt containing imidazole heterocycle comprise 1-hydroxyethyl-2-methyl-5-nitroimidazole, epoxy chloropropane and dodecyl dimethyl tertiary amine, and the weight ratio of the 1-hydroxyethyl-2-methyl-5-nitroimidazole to the epoxy chloropropane and the dodecyl dimethyl tertiary amine in the biquaternary ammonium salt containing imidazole heterocycle is 1: 1.4: 1.8; the matrix material is prepared from PLGA, ferroferric oxide, polyvinyl alcohol, agarose, cellulase and farnesol; the raw materials for preparing the adhesive comprise, by weight, 31 parts of ethylene-vinyl acetate copolymer, 0.8 part of polyvinyl alcohol, 0.5 part of nonionic surfactant, 0.3 part of anionic surfactant, 0.2 part of antiseptic bactericide and 50 parts of water; the antiseptic bactericide is 4, 5-dichloro-2-n-octyl-3-isothiazolinone; the non-ionic surfactant is OP-10, the anionic surfactant is sodium dodecyl benzene sulfonate, and the garden waste comprises leaves, barks, sawdust, pine needles and walnut shells;
the preparation method of the environment-friendly garden organic covering composition comprises the following steps:
(1) collecting garden waste, drying the garden waste in the sun to form dry materials, and crushing the dry materials to form granular materials;
(2) and (2) adding the granular material, the honeycomb activated carbon, the zeolite particles, the binder, the modified chitosan and the matrix material in the step (1) into a stirring device according to the parts by weight, and stirring for 4 hours to obtain the environment-friendly garden organic covering composition.
The preparation method of the modified chitosan comprises the following steps:
(1) bis-quaternary ammonium salts containing imidazole heterocycle: adding epoxy chloropropane into a reactor, heating to 75 ℃, slowly dropwise adding dodecyl dimethyl tertiary amine, stirring for 0.5h after dropwise adding, cooling to 55 ℃, adding acetonitrile, then adding 1-hydroxyethyl-2-methyl-5-nitroimidazole for 3 times, reacting for 8h while keeping the temperature, cooling to room temperature, concentrating under reduced pressure to obtain a crude product containing imidazole heterocyclic diquaternary ammonium salt, adding acetone, stirring for 0.5h, and concentrating under reduced pressure to obtain the imidazole heterocyclic diquaternary ammonium salt; in the biquaternary ammonium salt containing the imidazole heterocycle, the weight ratio of the 1-hydroxyethyl-2-methyl-5-nitroimidazole to the epichlorohydrin to the dodecyl dimethyl tertiary amine is 1: 1.4: 1.8; the weight ratio of the epichlorohydrin to the acetonitrile to the acetone is 1: 6: 4;
(2) modified chitosan: adding chitosan and 2% acetic acid solution in mass fraction into a reactor, and stirring for 1 hour until the weight ratio of the chitosan to the 2% acetic acid solution is 1: 20, slowly dropwise adding a sodium hydroxide solution with the mass fraction of 10%, adjusting the pH value to 9, continuously stirring for 2h, filtering to obtain alkalized chitosan, adding isopropanol, heating to 60 ℃, carrying out heat preservation reaction for 4h, slowly dropwise adding a biquaternary ammonium salt/water solution, after dropwise adding, heating to 80 ℃, carrying out heat preservation reaction for 10h, cooling to room temperature, adding acetone, filtering, leaching with acetone for 3 times, and drying under reduced pressure at 60 ℃ for 10h to obtain modified chitosan; the weight ratio of the biquaternary ammonium salt to the water in the biquaternary ammonium salt/water solution is 1: 4, the weight ratio of the alkalized chitosan to the isopropanol is 1: 10, the weight ratio of the chitosan to the biquaternary ammonium salt is 1: 0.11.
the preparation method of the matrix material comprises the following steps:
(1) preparing PLGA/ferroferric oxide mixed solution: adding PLGA and tetrahydrofuran into a reactor, stirring, adding ferroferric oxide after complete dissolution, and stirring for 0.5 h; the weight ratio of the PLGA to the tetrahydrofuran to the ferroferric oxide is 1: 5: 0.3;
(2) dropwise adding the PLGA/ferroferric oxide mixed solution obtained in the step (1) into a PVA/tetrahydrofuran mixed solution, stirring for 1h after dropwise adding, and removing tetrahydrofuran at 50 ℃ under reduced pressure to obtain PLGA nano microspheres loaded with ferroferric oxide; the weight ratio of the PVA to the ferroferric oxide is 1: 0.12; the weight ratio of the PVA to the tetrahydrofuran in the PVA/tetrahydrofuran mixed solution is 1: 3;
(3) adding the PLGA nano microspheres loaded with ferroferric oxide obtained in the step (2), agarose, deionized water and farnesol into a reactor, stirring for 0.5h, heating to 80 ℃, stirring for 2h, standing, cooling to 30 ℃, adding cellulase, and stirring for 3h to obtain a cellulase mixed solution to be immobilized; the weight ratio of the ferroferric oxide loaded PLGA nano microspheres to the agarose, the deionized water, the farnesol and the cellulase is 1: 0.024: 20: 0.002: 0.05;
(4) adding a calcium chloride aqueous solution into a reactor, stirring, slowly dropwise adding the mixed solution of the cellulase to be immobilized in the step (3), stirring at room temperature for 8 hours after dropwise adding, soaking for 20 hours, filtering and taking out spherical particles, and washing with deionized water to obtain the matrix material, wherein the concentration of the calcium chloride aqueous solution is 0.02g/ml, and the weight ratio of the calcium chloride aqueous solution to the mixed solution of the cellulase to be immobilized is 0.5: 1.
the preparation method of the adhesive comprises the following steps:
adding polyvinyl alcohol and water into a reactor according to the parts by weight, stirring and heating to 50 ℃, adding a nonionic surfactant, an ionic surfactant and an ethylene-vinyl acetate copolymer, stirring for 3 hours, cooling to room temperature, adding an anticorrosive bactericide, and stirring for 1 hour to obtain the binder.
Example 2
The environment-friendly garden organic covering composition comprises the following components in parts by weight:
the modified chitosan is chitosan-grafted biquaternary ammonium salt containing imidazole heterocycle, the raw materials for preparing the biquaternary ammonium salt containing imidazole heterocycle comprise 1-hydroxyethyl-2-methyl-5-nitroimidazole, epoxy chloropropane and dodecyl dimethyl tertiary amine, and the weight ratio of the 1-hydroxyethyl-2-methyl-5-nitroimidazole to the epoxy chloropropane and the dodecyl dimethyl tertiary amine in the biquaternary ammonium salt containing imidazole heterocycle is 1: 1.4: 1.8; the matrix material is prepared from PLGA, ferroferric oxide, polyvinyl alcohol, agarose, cellulase and farnesol; the raw materials for preparing the adhesive comprise, by weight, 31 parts of ethylene-vinyl acetate copolymer, 0.8 part of polyvinyl alcohol, 0.5 part of nonionic surfactant, 0.3 part of anionic surfactant, 0.2 part of antiseptic bactericide and 50 parts of water; the antiseptic bactericide is 4, 5-dichloro-2-n-octyl-3-isothiazolinone; the non-ionic surfactant is OP-10, the anionic surfactant is sodium dodecyl benzene sulfonate, and the garden waste comprises leaves, barks, sawdust, pine needles and walnut shells;
the preparation method of the environment-friendly garden organic covering composition, the preparation method of the modified chitosan, the preparation method of the matrix material and the preparation method of the binder are the same as those of example 1.
Example 3
The environment-friendly garden organic covering composition comprises the following components in parts by weight:
the modified chitosan is chitosan-grafted biquaternary ammonium salt containing imidazole heterocycle, the raw materials for preparing the biquaternary ammonium salt containing imidazole heterocycle comprise 1-hydroxyethyl-2-methyl-5-nitroimidazole, epoxy chloropropane and dodecyl dimethyl tertiary amine, and the weight ratio of the 1-hydroxyethyl-2-methyl-5-nitroimidazole to the epoxy chloropropane and the dodecyl dimethyl tertiary amine in the biquaternary ammonium salt containing imidazole heterocycle is 1: 1.4: 1.8; the matrix material is prepared from PLGA, ferroferric oxide, polyvinyl alcohol, agarose, cellulase and farnesol; the raw materials for preparing the adhesive comprise, by weight, 31 parts of ethylene-vinyl acetate copolymer, 0.8 part of polyvinyl alcohol, 0.5 part of nonionic surfactant, 0.3 part of anionic surfactant, 0.2 part of antiseptic bactericide and 50 parts of water; the antiseptic bactericide is 4, 5-dichloro-2-n-octyl-3-isothiazolinone; the non-ionic surfactant is OP-10, the anionic surfactant is sodium dodecyl benzene sulfonate, and the garden waste comprises leaves, barks, sawdust, pine needles and walnut shells;
the preparation method of the environment-friendly garden organic covering composition, the preparation method of the modified chitosan, the preparation method of the matrix material and the preparation method of the binder are the same as those of example 1.
Example 4
The environment-friendly garden organic covering composition comprises the following components in parts by weight:
the modified chitosan is chitosan-grafted biquaternary ammonium salt containing imidazole heterocycle, the raw materials for preparing the biquaternary ammonium salt containing imidazole heterocycle comprise 1-hydroxyethyl-2-methyl-5-nitroimidazole, epoxy chloropropane and dodecyl dimethyl tertiary amine, and the weight ratio of the 1-hydroxyethyl-2-methyl-5-nitroimidazole to the epoxy chloropropane and the dodecyl dimethyl tertiary amine in the biquaternary ammonium salt containing imidazole heterocycle is 1: 1.2: 1.5; the matrix material is prepared from PLGA, ferroferric oxide, polyvinyl alcohol, agarose, cellulase and farnesol; the raw materials for preparing the adhesive comprise, by weight, 31 parts of ethylene-vinyl acetate copolymer, 0.8 part of polyvinyl alcohol, 0.5 part of nonionic surfactant, 0.3 part of anionic surfactant, 0.2 part of antiseptic bactericide and 50 parts of water; the antiseptic bactericide is 4, 5-dichloro-2-n-octyl-3-isothiazolinone; the non-ionic surfactant is OP-10, the anionic surfactant is sodium dodecyl benzene sulfonate, and the garden waste comprises leaves, barks, sawdust, pine needles and walnut shells;
the preparation method of the environment-friendly garden organic covering composition, the preparation method of the modified chitosan, the preparation method of the matrix material and the preparation method of the binder are the same as those of example 1.
Example 5
The environment-friendly garden organic covering composition comprises the following components in parts by weight:
the modified chitosan is chitosan-grafted biquaternary ammonium salt containing imidazole heterocycle, the raw materials for preparing the biquaternary ammonium salt containing imidazole heterocycle comprise 1-hydroxyethyl-2-methyl-5-nitroimidazole, epoxy chloropropane and dodecyl dimethyl tertiary amine, and the weight ratio of the 1-hydroxyethyl-2-methyl-5-nitroimidazole to the epoxy chloropropane and the dodecyl dimethyl tertiary amine in the biquaternary ammonium salt containing imidazole heterocycle is 1: 2: 2; the matrix material is prepared from PLGA, ferroferric oxide, polyvinyl alcohol, agarose, cellulase and farnesol; the raw materials for preparing the adhesive comprise, by weight, 31 parts of ethylene-vinyl acetate copolymer, 0.8 part of polyvinyl alcohol, 0.5 part of nonionic surfactant, 0.3 part of anionic surfactant, 0.2 part of antiseptic bactericide and 50 parts of water; the antiseptic bactericide is 4, 5-dichloro-2-n-octyl-3-isothiazolinone; the non-ionic surfactant is OP-10, the anionic surfactant is sodium dodecyl benzene sulfonate, and the garden waste comprises leaves, barks, sawdust, pine needles and walnut shells;
the preparation method of the environment-friendly garden organic covering composition, the preparation method of the modified chitosan, the preparation method of the matrix material and the preparation method of the binder are the same as those of example 1.
Comparative example 1
The environment-friendly garden organic covering composition comprises the following components in parts by weight:
wherein the matrix material is prepared from PLGA, ferroferric oxide, polyvinyl alcohol, agarose, cellulase and farnesol; the raw materials for preparing the adhesive comprise, by weight, 31 parts of ethylene-vinyl acetate copolymer, 0.8 part of polyvinyl alcohol, 0.5 part of nonionic surfactant, 0.3 part of anionic surfactant, 0.2 part of antiseptic bactericide and 50 parts of water; the antiseptic bactericide is 4, 5-dichloro-2-n-octyl-3-isothiazolinone; the non-ionic surfactant is OP-10, the anionic surfactant is sodium dodecyl benzene sulfonate, and the garden waste comprises leaves, barks, sawdust, pine needles and walnut shells;
the preparation method of the environment-friendly garden organic covering composition, the preparation method of the matrix material and the preparation method of the binder are the same as those of example 1, except that chitosan is used instead of modified chitosan.
Comparative example 2
The environment-friendly garden organic covering composition comprises the following components in parts by weight:
the modified chitosan is chitosan-grafted biquaternary ammonium salt containing imidazole heterocycle, the raw materials for preparing the biquaternary ammonium salt containing imidazole heterocycle comprise 1-hydroxyethyl-2-methyl-5-nitroimidazole, epoxy chloropropane and dodecyl dimethyl tertiary amine, and the weight ratio of the 1-hydroxyethyl-2-methyl-5-nitroimidazole to the epoxy chloropropane and the dodecyl dimethyl tertiary amine in the biquaternary ammonium salt containing imidazole heterocycle is 1: 1.4: 1.8; the raw materials for preparing the adhesive comprise, by weight, 31 parts of ethylene-vinyl acetate copolymer, 0.8 part of polyvinyl alcohol, 0.5 part of nonionic surfactant, 0.3 part of anionic surfactant, 0.2 part of antiseptic bactericide and 50 parts of water; the antiseptic bactericide is 4, 5-dichloro-2-n-octyl-3-isothiazolinone; the non-ionic surfactant is OP-10, the anionic surfactant is sodium dodecyl benzene sulfonate, and the garden waste comprises leaves, barks, sawdust, pine needles and walnut shells;
the preparation method of the environment-friendly garden organic covering composition, the preparation method of the modified chitosan and the preparation method of the adhesive are the same as those of the embodiment 1, and the difference is that no matrix material exists.
Comparative example 3
The environment-friendly garden organic covering composition comprises the following components in parts by weight:
wherein the matrix material is prepared from PLGA, ferroferric oxide, polyvinyl alcohol, agarose, cellulase and farnesol; the raw materials for preparing the adhesive comprise, by weight, 31 parts of ethylene-vinyl acetate copolymer, 0.8 part of polyvinyl alcohol, 0.5 part of nonionic surfactant, 0.3 part of anionic surfactant, 0.2 part of antiseptic bactericide and 50 parts of water; the antiseptic bactericide is 4, 5-dichloro-2-n-octyl-3-isothiazolinone; the non-ionic surfactant is OP-10, the anionic surfactant is sodium dodecyl benzene sulfonate, and the garden waste comprises leaves, barks, sawdust, pine needles and walnut shells;
the preparation method of the environment-friendly garden organic covering composition, the preparation method of the matrix material and the preparation method of the binder are the same as those of example 1, except that no modified chitosan is used.
Comparative example 4
The environment-friendly garden organic covering composition comprises the following components in parts by weight:
the modified chitosan is chitosan-grafted biquaternary ammonium salt containing imidazole heterocycle, the raw materials for preparing the biquaternary ammonium salt containing imidazole heterocycle comprise 1-hydroxyethyl-2-methyl-5-nitroimidazole, epoxy chloropropane and dodecyl dimethyl tertiary amine, and the weight ratio of the 1-hydroxyethyl-2-methyl-5-nitroimidazole to the epoxy chloropropane and the dodecyl dimethyl tertiary amine in the biquaternary ammonium salt containing imidazole heterocycle is 1: 1.4: 1.8; the raw materials for preparing the adhesive comprise, by weight, 31 parts of ethylene-vinyl acetate copolymer, 0.8 part of polyvinyl alcohol, 0.5 part of nonionic surfactant, 0.3 part of anionic surfactant, 0.2 part of antiseptic bactericide and 50 parts of water; the antiseptic bactericide is 4, 5-dichloro-2-n-octyl-3-isothiazolinone; the non-ionic surfactant is OP-10, the anionic surfactant is sodium dodecyl benzene sulfonate, and the garden waste comprises leaves, barks, sawdust, pine needles and walnut shells;
the preparation method of the environment-friendly garden organic covering composition, the preparation method of the modified chitosan and the preparation method of the binder are the same as those in example 1, except that no matrix material is used, and the modified zeolite particles are zeolite particles loaded with cellulase.
The preparation method of the modified zeolite particles comprises the following steps:
(1) adding zeolite particles, agarose, deionized water and farnesol into a reactor, stirring for 0.5h, heating to 80 ℃, stirring for 2h, standing, cooling to 30 ℃, adding cellulase, and stirring for 3h to obtain a cellulase mixed solution to be immobilized; the weight ratio of the zeolite particles to the agarose, the deionized water, the farnesol and the cellulase is 1: 0.024: 20: 0.002: 0.05;
(2) adding a calcium chloride aqueous solution into a reactor, stirring, slowly dropwise adding the mixed solution of the cellulase to be immobilized in the step (1), stirring at room temperature for 8 hours after dropwise adding, soaking for 20 hours, filtering spherical particles, taking out, and washing with deionized water to obtain the modified zeolite, wherein the concentration of the calcium chloride aqueous solution is 0.02g/ml, and the weight ratio of the calcium chloride aqueous solution to the mixed solution of the cellulase to be immobilized is 0.5: 1.
comparative example 5
The environment-friendly garden organic covering composition comprises the following components in parts by weight:
wherein, the raw materials for preparing the adhesive comprise 31 parts of ethylene-vinyl acetate copolymer, 0.8 part of polyvinyl alcohol, 0.5 part of nonionic surfactant, 0.3 part of anionic surfactant, 0.2 part of antiseptic bactericide and 50 parts of water by weight; the antiseptic bactericide is 4, 5-dichloro-2-n-octyl-3-isothiazolinone; the non-ionic surfactant is OP-10, the anionic surfactant is sodium dodecyl benzene sulfonate, and the garden waste comprises leaves, barks, sawdust, pine needles and walnut shells;
the preparation method of the environment-friendly garden organic covering composition and the preparation method of the binder are the same as those in example 1, and the differences are that the modified zeolite particles are substituted for the zeolite particles, the chitosan is substituted for the modified chitosan, and no matrix material is used.
The preparation method of the modified zeolite particles comprises the following steps:
(1) adding zeolite particles, agarose, deionized water and farnesol into a reactor, stirring for 0.5h, heating to 80 ℃, stirring for 2h, standing, cooling to 30 ℃, adding cellulase, and stirring for 3h to obtain a cellulase mixed solution to be immobilized; the weight ratio of the zeolite particles to the agarose, the deionized water, the farnesol and the cellulase is 1: 0.024: 20: 0.002: 0.05;
(2) adding a calcium chloride aqueous solution into a reactor, stirring, slowly dropwise adding the mixed solution of the cellulase to be immobilized in the step (1), stirring at room temperature for 8 hours after dropwise adding, soaking for 20 hours, filtering spherical particles, taking out, and washing with deionized water to obtain the modified zeolite, wherein the concentration of the calcium chloride aqueous solution is 0.02g/ml, and the weight ratio of the calcium chloride aqueous solution to the mixed solution of the cellulase to be immobilized is 0.5: 1.
and (3) performance testing:
the test method comprises the following steps: pot test method; the height of the white plastic barrel with uniform specification is 50cm, the inner diameter is 48cm, the outer diameter is 50cm, and the bottom diameter is 32 cm; the test time is three months, and the weed inhibition index, the soil organic matter and nutrient index and the soil moisture content index are obtained after the test of three months.
Taking out soil once when covering for 3 months, and measuring organic matters, quick-acting nitrogen and quick-acting phosphorus;
1. soil water content:
WET soil moisture/salinity/thermometer was used. Monitoring the water content of the soil in each month within an observation period, wherein the observation time is 08:00-18:00, the observation is carried out once every 2 hours, the observation depth is 0-20cm, and the observation is repeated for 3 times;
2. soil nutrient
Oxidizing organic carbon in the soil by adopting a potassium dichromate-sulfuric acid solution, and calculating the content of organic matters in the soil according to the mass difference and coefficient of an oxidant before and after oxidation; measuring quick-acting nitrogen by alkali-diffusion method; measuring the soil available phosphorus by a hydrochloric acid-ammonium fluoride method; by NH4And (3) measuring the soil quick-acting potassium by using an OAC (activated carbon) leaching-flame photometry method.
From the data, the environment-friendly garden organic covering composition provided by the invention can effectively maintain soil moisture, regulate temperature, improve soil physicochemical property, strengthen soil microbial activity, regulate soil water, fertilizer, gas and heat conditions, improve soil fertility, regulate plant growth and development, enhance disease prevention and resistance of trees, resist low temperature, has stable performance and rain wash resistance, and overcomes dust or secondary dust of organic coverings to achieve the effect of beautifying the environment.
The foregoing examples are illustrative only, and serve to explain some of the features of the present disclosure. The appended claims are intended to claim as broad a scope as is contemplated, and the examples presented herein are merely illustrative of selected implementations in accordance with all possible combinations of examples. Accordingly, it is applicants' intention that the appended claims are not to be limited by the choice of examples illustrating features of the invention. And that advances in science and technology will result in possible equivalents or sub-substitutes not currently contemplated for reasons of inaccuracy in language representation, and such changes should also be construed where possible to be covered by the appended claims.
Claims (7)
1. An environment-friendly garden organic covering composition is characterized by comprising the following components in parts by weight:
wherein the modified chitosan is chitosan grafted biquaternary ammonium salt containing imidazole heterocycle; the raw materials for preparing the biquaternary ammonium salt containing the imidazole heterocycle comprise 1-hydroxyethyl-2-methyl-5-nitroimidazole, epichlorohydrin and dodecyl dimethyl tertiary amine; in the biquaternary ammonium salt containing the imidazole heterocycle, the weight ratio of the 1-hydroxyethyl-2-methyl-5-nitroimidazole to the epichlorohydrin to the dodecyl dimethyl tertiary amine is 1: 1.4: 1.8;
the matrix material is prepared from PLGA, ferroferric oxide, polyvinyl alcohol, agarose, cellulase and farnesol;
the raw materials for preparing the adhesive comprise ethylene-vinyl acetate copolymer, polyvinyl alcohol, nonionic surfactant, anionic surfactant, antiseptic bactericide and water.
2. The environment-friendly garden organic covering composition as defined in claim 1, wherein the modified chitosan has a weight average molecular weight of 1000-5000.
3. The environment-friendly garden organic covering composition as claimed in claim 1, wherein the binder is prepared from 30-35 parts by weight of ethylene-vinyl acetate copolymer, 0.5-2 parts by weight of polyvinyl alcohol, 0.5-1 part by weight of nonionic surfactant, 0.2-0.5 part by weight of anionic surfactant, 0.1-0.5 part by weight of antiseptic bactericide and 50-60 parts by weight of water.
4. The eco-friendly horticultural organic covering composition according to claim 3, wherein the non-ionic surfactant includes one or more of OP series surfactant, NP series surfactant, Tween series surfactant.
5. The eco-friendly horticultural organic covering composition according to claim 3, wherein the anionic surfactant comprises one or more of sodium dodecylbenzene sulfate, sodium dodecylbenzene sulfonate, sodium hexadecylbenzene sulfate, and lauric acid sulfate.
6. The environment-friendly garden organic covering composition according to claim 1, wherein the garden waste comprises one or more of leaves, bark, wood chips, pine needles, walnut shells.
7. The method for preparing environment-friendly garden organic covering composition according to any one of claims 1 to 6, comprising the steps of:
(1) collecting garden waste, drying the garden waste in the sun to form dry materials, and crushing the dry materials to form granular materials;
(2) and (2) adding the granular material, the honeycomb activated carbon, the zeolite particles, the binder, the modified chitosan and the matrix material in the step (1) into a stirring device according to the parts by weight, and stirring for 3-5 hours to obtain the environment-friendly garden organic covering composition.
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| CN110527518A (en) * | 2018-05-24 | 2019-12-03 | 安徽大汇园林工程有限公司 | A kind of organic covering composition in environment-friendly type gardens |
| CN108912714A (en) * | 2018-07-27 | 2018-11-30 | 河北动向科技有限公司 | A kind of solid waste forestry plant fiber ecological ground mulching materials curing agent and preparation method thereof and construction method |
| CN108841399B (en) * | 2018-08-24 | 2021-03-30 | 吉林省中辰园林股份有限公司 | Organic covering |
| CN109305858A (en) * | 2018-12-06 | 2019-02-05 | 天津市琪梦环保科技有限公司 | A kind of open ground covering |
| CN113179909A (en) * | 2021-04-26 | 2021-07-30 | 绿地集团森茂园林有限公司 | Organic covering for plant cultivation |
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| CN102388773A (en) * | 2011-07-20 | 2012-03-28 | 上海交通大学 | Organic mulch on earth surface of garden trees and application method thereof |
| CN106242626A (en) * | 2016-07-28 | 2016-12-21 | 天津海泰市政绿化有限公司 | A kind of environment-friendly type plant pit covering |
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| CN102388773A (en) * | 2011-07-20 | 2012-03-28 | 上海交通大学 | Organic mulch on earth surface of garden trees and application method thereof |
| CN106242626A (en) * | 2016-07-28 | 2016-12-21 | 天津海泰市政绿化有限公司 | A kind of environment-friendly type plant pit covering |
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