Adhesive for quickly curing tea seed cake liquid mulching film into film

Abstract

The invention relates to an adhesive for quickly curing a tea seed cake liquid mulching film into a film, which is characterized by comprising the following components in percentage by weight: 30-50% of tea seed cake extract; 5 to 15 percent of beet polysaccharide; 0.3 to 0.8 percent of nano SiO2; 0.05 to 0.2 percent of zinc humate; the adhesive comprises the following components in percentage by weight: 20-30% of beet polysaccharide, 10-20% of tea polyphenol, 10-20% of nano SiO2, 10-20% of nano SiO2 and 45-65% of water, the molar ratio of beet polysaccharide to tea polyphenol is 1: (1.5-2.2) so as to promote dynamic ester bond crosslinking, the nano SiO2 is modified by polyethylene glycol (PEG-4000), the zeta potential ranges from-25 mV to-35 mV, the nano SiO2 is used for regulating and controlling the surface tension gradient of a liquid film, and the adhesive can keep the dynamic crosslinking capacity for 72-80 hours when the pH value of soil ranges from 5.5 to 7.8. According to the adhesive for rapidly curing and forming the tea seed cake liquid mulching film, rapid curing for 35 + / -5 minutes is achieved through the catalysis of the zinc humate and the synergistic effect of the nano SiO2, compared with a traditional starch-based mulching film, the efficiency is improved, the farming operation interval is greatly shortened, a gradient pore structure is formed through induction of the nano SiO2, the surface layer is 5 microns / the bottom layer is 20 microns, wind erosion prevention and air permeability are both considered, the self-organization film forming thickness is 1.2 + / -0.3 mm, and the film forming efficiency is greatly improved. The coefficient of variation is less than 8%, and the film-forming property is excellent.

Description

Technical Field

[0001] The invention relates to the technical field of liquid ground film adhesives, in particular to an adhesive for rapidly solidifying tea dregs liquid ground film into a film. Background Art

[0002] Biodegradable liquid mulch film is made from crop straw and is a polymer material formed by special processing of natural polymer substances such as lignin, collagen, surfactants, and soil water-retaining agents. When used, herbicides can be mixed into it, and 20 to 30 times the amount of water can be added. It can be sprayed directly on the surface of the farmland. It can immediately form an insulating film that is integrated with the surface of the soil and is 100% degraded in about 90 days. This layer of biodegradable film can maintain soil moisture and protect field soil moisture conditions. It can also increase the temperature of the 5 to 15 cm soil layer by 1 to 6 degrees.

[0003] For example, Chinese Patent 202311438914.1 proposes a liquid mulch film additive with a high garlic residue content and its application in liquid mulch. This garlic residue-based liquid mulch film additive reduces the viscosity of liquid mulch film emulsions with a high garlic residue content, facilitating their spraying and increasing their spraying distance. Liquid mulch films with a high garlic residue content prepared using this liquid mulch film additive can significantly increase the temperature and moisture content of the soil they cover, effectively reducing the infestation of Plutella xylostella on Chinese cabbage.

[0004] Existing liquid mulch films generally have problems such as low film strength and poor degradation controllability. Traditional polyethylene mulch films lead to white pollution. Although 202210697920.8 proposed a cellulose-reinforced starch-based biodegradable mulch film and its preparation method, its moisture permeability porosity is less than 60%, and the curing time exceeds 4 hours. Tea dregs are a waste product from tea oil processing. The tea polyphenols and lignin in their extracts have excellent film-forming properties, but the existing technology has failed to solve the problem of their directional binding with soil particles. Therefore, an adhesive for rapid curing of tea dregs liquid mulch film is proposed to solve the above problems. Summary of the Invention

[0005] In response to the shortcomings of the existing technology, the present invention provides an adhesive for the rapid solidification of tea ash liquid mulch into a film, which has the advantages of enhanced film-forming performance, improved liquid mulch and enhanced degradation effects, and solves the common problems of existing liquid mulch such as low film strength and poor degradation controllability. Traditional polyethylene mulch leads to white pollution. Although 202210697920.8 proposes a cellulose-reinforced starch-based biodegradable mulch and a preparation method thereof, its moisture permeability porosity is less than 60%, and the curing time exceeds 4 hours. Tea ash is a waste product from tea oil processing, and the tea polyphenols and lignin in its extract have excellent film-forming properties, but the existing technology has failed to solve the problem of its directional binding with soil particles.

[0006] To achieve the above object, the present invention provides the following technical solution: an adhesive for rapidly solidifying tea dregs liquid mulch film, comprising the following components in percentage:

[0007] Tea kud extract: 30-50%;

[0008] Beet polysaccharides: 5-15%

[0009] Nano-SiO2: 0.3-0.8%:

[0010] Zinc humate: 0.05-0.2%;

[0011] Water: 45-65%.

[0012] A composite system of tea dregs extract (tea polyphenols + lignin) and beet polysaccharide is used, and nano-SiO2 is introduced to regulate the film-forming structure.

[0013] Tea dregs extract: extracted with ethanol / water (7:3) to ensure a high content of active ingredients (tea polyphenols ≥ 28%, lignin ≥ 15%), giving the adhesive antioxidant properties and film-forming stability.

[0014] Beet polysaccharide: As a natural cross-linking agent, its β-1,4 glycosidic bond can form a dynamic ester bond with the phenolic hydroxyl groups of tea polyphenols, enhancing the pH responsiveness of the adhesive (stable within the range of 5.5-7.8).

[0015] Nano-SiO2 (20-40nm): Promotes uniform film formation (1.2±0.3mm) and enhances mechanical strength by regulating the Marangoni effect during liquid film evaporation.

[0016] Zinc humate: acts as a catalytic cross-linking agent to accelerate the esterification reaction between beet polysaccharides and tea polyphenols, shortening the curing time to ≤40 minutes

[0017] Furthermore, the molar ratio of the beet polysaccharide to tea polyphenols is 1:(1.5-2.2) to promote dynamic ester bond cross-linking.

[0018] This ratio ensures that:

[0019] Dynamic cross-linking stability: Under soil pH fluctuations (5.5-7.8), the ester bond can reversibly break and reorganize, maintaining cross-linking activity for 72 hours.

[0020] Film toughness: If there is too much beet polysaccharide (>1:1.5), the cross-linking is too dense, resulting in increased film brittleness; if there is too little (<1:2.2), the cross-linking is insufficient and the film strength decreases.

[0021] Furthermore, the nano-SiO2 is modified with polyethylene glycol (PEG-4000) and has a zeta potential of -25 to -35 mV, which is used to regulate the surface tension gradient of the liquid film.

[0022] PEG-4000 modification: Improve the dispersion of nano-SiO2 in the adhesive and avoid agglomeration.

[0023] Zeta potential (-25 to -35 mV): Ensures that the nanoparticles are stably suspended in the liquid phase to prevent sedimentation.

[0024] Surface tension regulation: Nano-SiO2 forms a micro-area surface tension gradient when the liquid film evaporates, guiding the liquid film to self-organize and form a uniform and dense soil shell structure.

[0025] Furthermore, the adhesive can maintain dynamic cross-linking ability for 72-80 hours in the soil pH range of 5.5-7.8, and the curing time is 30-40 minutes.

[0026] pH 5.5-7.8 Adaptability: The carboxyl groups (-COOH) of sugar beet polysaccharides are protonated under acidic conditions (pH < 5.5), reducing their cross-linking ability. Under alkaline conditions (pH > 7.8), the ester bonds are easily hydrolyzed. This adhesive ensures stable cross-linking within the common soil pH range through optimized formulations.

[0027] Curing time 30-40 minutes: Humic acid zinc catalysis + nano-SiO2 promotes water evaporation, allowing the liquid film to quickly form a stable structure, greatly improving efficiency compared to traditional starch-based films (curing > 4 hours).

[0028] Furthermore, the tea dregs extract is extracted 3-4 times with ethanol / water (7:3, v / v) at 50-60° C. and concentrated to a solid content of 45-50%.

[0029] Ethanol / water (7:3) extraction: This ratio can maximize the extraction of tea polyphenols and lignin while reducing impurities such as oil.

[0030] Extract at 50-60℃ low temperature: avoid high temperature destroying the activity of tea polyphenols.

[0031] 3-4 extractions + concentration to 45% solid content: Ensure the extract concentration is appropriate to avoid the subsequent adhesive being too thick or too thin.

[0032] Furthermore, the beet polysaccharide was dissolved with the assistance of ultrasound (40 kHz, 300 W, 30 min) to improve its cross-linking activity.

[0033] Ultrasonic wave (40kHz, 300W, 30min): destroys hydrogen bonds between polysaccharide molecules, increases dissolution rate, exposes more β-1,4 glycosidic bonds, enhances cross-linking efficiency with tea polyphenols, and avoids molecular chain degradation caused by traditional heating dissolution.

[0034] A method for preparing an adhesive comprises the following steps:

[0035] (1) Tea kud powder was extracted with subcritical water (120-150°C, 2-3 MPa) to obtain tea polyphenol-lignin complex;

[0036] (2) After beet polysaccharide is dissolved, it is mixed with tea kud extract in a certain proportion, nano-SiO2 and zinc humate are added, and homogenization is performed;

[0037] (3) Adjust the pH to 6.0-7.5 to obtain a stable and uniform adhesive system.

[0038] Furthermore, the addition amount of the nano-SiO2 is 0.3-0.8% of the total system mass to optimize the continuity and mechanical properties of the soil shell.

[0039] 0.3-0.8% addition amount:

[0040] <0.3%: Insufficient surface tension control and uneven film formation.

[0041] >0.8%:The viscosity is too high, spraying is difficult, and the cost increases.

[0042] Optimal 0.5%: At this point, the soil crust's wind erosion resistance reaches its peak (12.3kPa), and the moisture permeability porosity remains above 85%.

[0043] A method of applying adhesive using a backpack sprayer at 2-3 L / m 2 Evenly spray the amount on the soil surface, and form a protective layer with a gradient pore structure after film formation;

[0044] The adhesive is suitable for soil moisture conservation in arid and semi-arid areas, and can increase soil moisture content by 23.7% and crop emergence rate by 15.2%.

[0045] Compared with the existing technology, the technical solution of this application has the following beneficial effects:

[0046] 1. The adhesive for the tea dregs liquid mulch film quickly solidifies into a film. Through the catalysis of zinc humate and the synergistic effect of nano-SiO2, it can achieve rapid solidification in 35±5 minutes. Compared with traditional starch-based mulch, the efficiency is improved and the interval between agricultural operations is greatly shortened. Nano-SiO2 induces the formation of a gradient pore structure with a surface layer of 5μm and a bottom layer of 20μm, which takes into account both wind erosion protection and air permeability. The self-organized film thickness is 1.2±0.3mm, the coefficient of variation is less than 8%, and it has excellent film-forming performance.

[0047] 2. The tea dregs liquid mulch film quickly solidifies into a film-forming adhesive with outstanding mechanical properties. The dynamic cross-linking system enables the tensile strength to reach 3.0-3.5MPa, and the elongation at break remains at 42±3%, which is better than that of pure polysaccharide film. The wind erosion resistance is 12.3kPa, meeting the protection requirements of level 8 wind (20m / s). Reversible cross-linking within 72 hours makes the crack self-repair rate >90%, and the strength retention rate is 82% after 25 cycles of dry-wet.

[0048] 3. The tea dregs liquid mulch film quickly solidifies into a film-forming adhesive with excellent ecological adaptability. The viscosity fluctuation in the pH range of 5.5-7.8 is less than 10%. The cross-linking is delayed by 50 minutes at pH 5.5 in acidic soil and accelerated by 25 minutes at pH 7.8 in alkaline soil. The natural degradation rate of 82.3% in 180 days meets the requirements of ASTM D5988. The degradation products promote the increase of soil organic matter by 0.8-1.2 percentage points. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 This is a flow chart of the method for preparing an adhesive for rapidly solidifying tea dregs liquid mulch film of the present invention;

[0050] Figure 2 This is a diagram showing the degradation process of the adhesive preparation method for the rapid solidification of tea dregs liquid mulch film according to the present invention. DETAILED DESCRIPTION

[0051] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0052] Example 1

[0053] See also Figure 1 In this embodiment, a tea dregs liquid mulch film adhesive for rapid solidification is composed of the following percentage components:

[0054] Tea kud extract: 30%;

[0055] Beet polysaccharides: 5%

[0056] Nano-SiO2: 0.3%:

[0057] Zinc humate: 0.05%;

[0058] Water: 64.6%.

[0059] Specifically, the molar ratio of beet polysaccharide to tea polyphenols is 1:1.5 to promote dynamic ester bond crosslinking. Nano-SiO2 is modified with polyethylene glycol (PEG-4000) and has a zeta potential of -25mV to regulate the surface tension gradient of the liquid film. The adhesive can maintain dynamic crosslinking ability for 72 hours within the soil pH range of 5.5 and has a curing time of 30 minutes. The tea kud extract is extracted three times with ethanol / water (7:3, v / v) at 50°C and concentrated to a solid content of 45%. Beet polysaccharide is dissolved by ultrasound at 40kHz, 300W, and 30min to improve its crosslinking activity.

[0060] In this embodiment, the method for preparing the adhesive by using the above components includes the following steps:

[0061] (1) Tea kud powder was extracted with subcritical water (120°C, 2 MPa) to obtain tea polyphenol-lignin complex;

[0062] (2) After beet polysaccharide is dissolved, it is mixed with tea kud extract in a certain proportion, nano-SiO2 and zinc humate are added, and homogenization is performed;

[0063] (3) Adjust the pH to 6.0 to obtain a stable and uniform adhesive system.

[0064] Specifically, the addition amount of nano-SiO2 is 0.3% of the total system mass to optimize the continuity and mechanical properties of the soil shell.

[0065] Performance test results:

[0066] Curing time: 36 minutes.

[0067] Tensile strength: 3.25MPa.

[0068] Moisture permeability: 86.3%.

[0069] Field water retention rate: 24.1%.

[0070] In this embodiment, through the synergistic effect of humic acid zinc catalysis and nano-SiO2, rapid solidification is achieved in 35 minutes, which is more efficient than traditional starch-based membranes and greatly shortens the intervals between agricultural operations. Nano-SiO2 induces the formation of a gradient pore structure with a surface layer of 5μm and a bottom layer of 20μm, taking into account both wind erosion protection and air permeability. The self-organized membrane thickness is 1.2mm, the coefficient of variation is <8%, and it has excellent film-forming properties.

[0071] Example 2

[0072] In this embodiment, a tea dregs liquid mulch film adhesive for rapid solidification is composed of the following components in percentage:

[0073] Tea kud extract: 44%;

[0074] Beet polysaccharides: 10%

[0075] Nano-SiO2: 0.8%:

[0076] Zinc humate: 0.2%;

[0077] Water: 45.

[0078] Specifically, the molar ratio of beet polysaccharide to tea polyphenols is 1:2.2 to promote dynamic ester bond crosslinking. Nano-SiO2 is modified with polyethylene glycol (PEG-4000) and has a zeta potential of -35mV to regulate the surface tension gradient of the liquid film. The adhesive can maintain dynamic crosslinking ability for 80 hours within the soil pH range of 7.8 and has a curing time of 40 minutes. The tea kud extract is extracted four times with ethanol / water (7:3, v / v) at 60°C and concentrated to a solid content of 50%. Beet polysaccharide is dissolved by ultrasound at 40kHz, 300W, and 30min to improve its crosslinking activity.

[0079] In this embodiment, the method for preparing the adhesive by using the above components includes the following steps:

[0080] (1) Tea kud powder was extracted with subcritical water (150°C, 3 MPa) to obtain tea polyphenol-lignin complex;

[0081] (2) After beet polysaccharide is dissolved, it is mixed with tea kud extract in a certain proportion, nano-SiO2 and zinc humate are added, and homogenization is performed;

[0082] (3) Adjust the pH to 7.5 to obtain a stable and uniform adhesive system.

[0083] Specifically, the addition amount of nano-SiO2 is 0.8% of the total system mass to optimize the continuity and mechanical properties of the soil shell.

[0084] Applicable scenarios:

[0085] Suitable for areas with heavy rainfall (>800mm / year) and light soil that requires rapid water permeability.

[0086] In this embodiment, it has outstanding mechanical properties. The dynamic cross-linking system makes the tensile strength reach 3.0-3.5MPa, and the elongation at break is maintained at 42±3%, which is better than the pure polysaccharide film. The wind erosion resistance is 12.3kPa, which meets the protection requirements of level 8 wind (20m / s). The reversible cross-linking within 72 hours makes the crack self-repair rate >90%, and the strength retention rate is 82% after 25 cycles of dry and wet.

[0087] Example 3

[0088] In this embodiment, a tea dregs liquid mulch film adhesive for rapid solidification is composed of the following components in percentage:

[0089] Tea kud extract: 45;

[0090] Beet polysaccharides: 8%

[0091] Nano-SiO2: 0.5%:

[0092] Zinc humate: 0.1%;

[0093] Water: 46.4%.

[0094] Specifically, the molar ratio of beet polysaccharide to tea polyphenols is 1:2.0 to promote dynamic ester bond crosslinking. Nano-SiO2 is modified with polyethylene glycol (PEG-4000) and has a zeta potential of -30 mV to regulate the surface tension gradient of the liquid film. The adhesive can maintain dynamic crosslinking ability for 78 hours within the soil pH range of 6.2 and has a curing time of 35 minutes. The tea kud extract is extracted three times with ethanol / water (7:3, v / v) at 55°C and concentrated to a solid content of 48%. Beet polysaccharide is dissolved by ultrasound at 40 kHz, 300 W, and 30 minutes to improve its crosslinking activity.

[0095] In this embodiment, the method for preparing the adhesive by using the above components includes the following steps:

[0096] (1) Tea kud powder was extracted with subcritical water (140°C, 2 MPa) to obtain tea polyphenol-lignin complex;

[0097] (2) After beet polysaccharide is dissolved, it is mixed with tea kud extract in a certain proportion, nano-SiO2 and zinc humate are added, and homogenization is performed;

[0098] (3) Adjust the pH to 6.8 to obtain a stable and uniform adhesive system.

[0099] Specifically, the addition amount of nano-SiO2 is 0.6% of the total system mass to optimize the continuity and mechanical properties of the soil shell.

[0100] In this embodiment, it has excellent adaptability to the ecological environment, with viscosity fluctuations of less than 10% in the pH range of 5.5-7.8, cross-linking is delayed by 50 minutes and solidified at pH 5.5 in acidic soil, and accelerated by 25 minutes and solidified at pH 7.8 in alkaline soil. The natural degradation rate of 82.3% after 180 days meets the requirements of ASTM D5988, and the degradation products promote the increase of soil organic matter by 0.8-1.2 percentage points.

[0101] Example 4: Nano-SiO2 Optimization Experiment

[0102] Variable control: other components are fixed and only the nano-SiO2 content is changed by 0.1%-1.0%.

[0103] Key findings:

[0104] <![CDATA[SiO2 content]]> Film uniformity Moisture permeability Compressive strength 0.3％ ±0.4mm 88％ 2.8MPa 0.5％ ±0.2mm 86％ 3.3MPa 0.8％ ±0.1mm 83％ 3.6MPa

[0105] in conclusion:

[0106] 0.5-0.6% is the best price-performance range.

[0107] Example 5: Field comprehensive performance evaluation

[0108] Experimental Design:

[0109] Location: Corn-growing area of ​​Shandong, semi-arid.

[0110] Control: ordinary PE mulch film.

[0111] Parameters: spraying volume 2.5L per mu, film thickness 1.3mm.

[0112] 120 days of observation data:

[0113] index The present invention PE mulch Soil moisture content 18.7％ 15.2％ Ground temperature stability ±3.2℃ ±6.8℃ Microbial population <![CDATA[2.1×10 8 CFU / g]]> <![CDATA[0.8×10 8 CFU / g]]> Degradation degree 76％ 0％

[0114] Economic benefits:

[0115] The labor recovery cost is saved by 80 yuan per mu and the corn yield is increased by 65kg.

[0116] Example 6: Special study on degradation characteristics

[0117] Test method: Compost degradation test was conducted according to ISO17556, and FTIR was used to track the changes in molecular structure.

[0118] Please refer to Figure 2 , degradation process:

[0119] 0-15 days: sugar beet polysaccharide chain breakage (1650cm -1 peak weakening);

[0120] 15-30 days: Ester bond hydrolysis (1700cm -1 (hydrogen bond) strong peak);

[0121] 30-90 days: Oxidation of lignin aromatic rings (1720cm -1 New Peak);

[0122] 90-180 days: SiO2 skeleton exposure (1100cm -1 peak enhancement).

[0123] Ecological security:

[0124] The degradation liquid had no inhibitory effect on the germination rate of wheat, with a relative germination rate of 98.3%.

[0125] In summary, the tea dregs liquid mulch film's rapid curing adhesive, through the synergistic effect of zinc humate catalysis and nano-SiO2, achieves a rapid curing time of 35±5 minutes. This improves efficiency compared to traditional starch-based mulches and significantly shortens agricultural operation intervals. Nano-SiO2 induces a gradient pore structure with a surface layer of 5μm and a bottom layer of 20μm, balancing wind erosion protection with breathability. The self-organized film thickness is 1.2±0.3mm, with a coefficient of variation of <8%, demonstrating excellent film-forming properties. It possesses outstanding mechanical properties. The dynamic crosslinking system achieves a tensile strength of 3.0-3.5MPa and maintains an elongation at break of 42±3%, surpassing pure polysaccharide films. Its wind erosion resistance is 12.3kPa, meeting the protection requirements for level 8 winds (20m / s). Reversible crosslinking within 72 hours results in a crack self-repair rate of >90%, and the strength retention rate after 25 dry-wet cycles is 82%. It has excellent adaptability to the ecological environment, with viscosity fluctuations of less than 10% in the pH range of 5.5-7.8. Cross-linking is delayed by 50 minutes and solidified at pH 5.5 in acidic soil, and accelerated by 25 minutes and solidified at pH 7.8 in alkaline soil. The natural degradation rate after 180 days is 82.3%, which meets the requirements of ASTM D5988. The degradation products promote the increase of soil organic matter by 0.8-1.2 percentage points.

[0126] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0127] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A tea dregs liquid mulch film fast solidification adhesive, characterized in that: It is composed of the following percentage components: Tea kud extract: 30-50%; Beet polysaccharides: 5-15% Nano-SiO2: 0.3-0.8%: Zinc humate: 0.05-0.2%; Water: 45-65%.

2. The adhesive for rapid solidification of tea dregs liquid mulch film according to claim 1, characterized in that: The molar ratio of the beet polysaccharide to the tea polyphenols is 1:(1.5-2.2) to promote dynamic ester bond cross-linking.

3. The adhesive for rapid solidification of tea dregs liquid mulch film according to claim 1, characterized in that: The nano-SiO2 is modified with polyethylene glycol (PEG-4000) and has a zeta potential of -25 to -35 mV, which is used to regulate the surface tension gradient of the liquid film.

4. The adhesive for rapid solidification of tea dregs liquid mulch film according to claim 1, characterized in that: The adhesive can maintain dynamic cross-linking capability for 72-80 hours within the soil pH range of 5.5-7.8, and the curing time is 30-40 minutes.

5. The adhesive for rapid solidification of tea dregs liquid mulch film according to claim 1, characterized in that: The tea kud extract is extracted 3-4 times with ethanol / water (7:3, v / v) at 50-60° C. and concentrated to a solid content of 45-50%.

6. The adhesive for rapid solidification of tea dregs liquid mulch film according to claim 1, characterized in that: The beet polysaccharide was dissolved with the aid of ultrasound (40 kHz, 300 W, 30 min) to enhance its cross-linking activity.

7. A method for preparing the adhesive according to any one of claims 1 to 6, characterized in that: The following steps are involved: (1) Tea kud powder was extracted with subcritical water (120-150°C, 2-3 MPa) to obtain tea polyphenol-lignin complex; (2) After beet polysaccharide is dissolved, it is mixed with tea kud extract in a certain proportion, nano-SiO2 and zinc humate are added, and homogenization is performed; (3) Adjust the pH to 6.0-7.5 to obtain a stable and uniform adhesive system.

8. The adhesive for rapid solidification of tea dregs liquid mulch film according to claim 1, characterized in that: The amount of the nano-SiO2 added is 0.3-0.8% of the total system mass to optimize the continuity and mechanical properties of the soil shell.

9. A method for applying the adhesive according to any one of claims 1 to 7, characterized in that: Use a backpack sprayer at 2-3L / m 2 Evenly spray the amount on the soil surface, and form a protective layer with a gradient pore structure after film formation; The adhesive is suitable for soil moisture conservation in arid and semi-arid areas, and can increase soil moisture content by 23.7% and crop emergence rate by 15.2%.

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