A corn straw fiber-based nonwoven composite material, its preparation method and application

Abstract

The present invention relates to a corn straw fiber-based nonwoven composite material, its preparation method and application, belonging to the technical field of nonwoven composite materials. The preparation method of the present invention includes the following steps: S1, pretreat the corn straw through alkali treatment and wet-laying process to obtain a corn straw fiber web; S2, attach degradable films on both sides of the corn straw fiber web obtained in S1, and obtain the corn straw fiber-based nonwoven composite material through hot rolling. The corn straw fiber-based nonwoven composite material of the present invention has good mechanical properties, air permeability and biodegradability. When it is applied to a gardening flowerpot, after the flowerpot is biodegradated, it is converted into water and carbon dioxide, and the corn straw can be used as fertilizer to promote the growth of plants, providing an effective way for the recycling of waste crop straws.

Description

Technical Field

[0001] The present invention belongs to the technical field of non-woven composite materials, and particularly relates to a corn straw fiber-based non-woven composite material, a preparation method thereof, and an application thereof. Background Art

[0002] China is rich in straw resources. The straw output has been stable at 800 million tons per year in the past decade. Among them, about 350 million tons of corn straw are produced annually in agricultural production, accounting for 40% of the total crop straw, which is an important renewable resource. Currently, the utilization of corn straw globally is relatively rough, and the added value of products is low. In developed countries such as Europe and the United States and China, the main methods for recycling and treating corn straw are to use the roots of corn straw for fertilization and returning to the field, and the parts above the roots are used for making feed or directly burned. However, the research and application of corn straw waste in material utilization are relatively few, and the comprehensive utilization rate is low. If agricultural residues are not reasonably utilized, it will not only cause waste of resources but also pollute the environment.

[0003] Using corn straw as raw material, fibers are obtained from corn straw husks, and non-woven materials are prepared by the process of wet laying and chemical bonding reinforcement. The non-woven fabrics prepared have good breaking strength, tearing ability, and degradability. In addition, agricultural mulch films can be prepared from corn straw fibers. After starch and glycerol are gelatinized, they are used as adhesives, and agricultural mulch films are prepared through chemical bonding reinforcement process, which have good strength and air permeability, and can improve the soil after degradation. Corn straw nanocellulose is obtained by steam explosion method, and corn straw nanocellulose-starch films are prepared by co-blending casting method, effectively improving the tensile strength, moisture permeability coefficient, and oxygen permeability coefficient of starch films. In addition, corn straw is treated by potassium hydroxide-sodium chlorite method to extract corn straw cellulose, and the prepared cellulose film has obvious better tea preservation effect than tea bag bags. However, the above processes for preparing corn straw composite materials are all relatively complex, and the types of added substances are relatively many, and the applications are also mostly limited to agricultural mulch films, packaging materials, etc.

[0004] Currently, with the continuous increase in the demand for horticultural products, the use of plastics has increased significantly. Plastic pots are light in weight, low in cost, not easily broken, and easy to transport. However, plastics are not biodegradable, and the large amount of use has posed a serious threat to the environment. In addition, plastic flower pots have poor air permeability and may damage the young roots of plants during transplantation. The negative impacts of the use of plastic pots on plants and the environment have led research scholars to continuously explore new environmentally friendly and sustainable materials for horticultural applications. Summary of the Invention

[0005] To solve the above technical problems, the present invention provides a corn straw fiber-based non-woven composite material, a preparation method thereof, and an application thereof.

[0006] The first object of the present invention is to provide a method for preparing a corn straw fiber-based nonwoven composite material, comprising the following steps,

[0007] S1. Pretreat the corn straw through an alkali treatment and a wet-laying process to obtain a corn straw fiber web;

[0008] S2. Bond biodegradable films on both sides of the corn straw fiber web obtained in S1, and obtain the corn straw fiber-based nonwoven composite material through hot rolling.

[0009] In an embodiment of the present invention, the extraction of corn straw fibers comprises the following steps: Boil and heat the corn straw solution. After the corn straw becomes soft, cut its length to 1±0.2 cm to obtain the pretreated corn straw; The boiling and heating are divided into two stages. The first stage is heating at 95°C - 100°C for 20 min - 25 min; The second stage is heating at 80°C - 85°C for 90 min - 100 min.

[0010] In an embodiment of the present invention, in S1, the alkali treatment is to add an alkali solution to the pretreated corn straw, heat it in a water bath, and after cooling, filtering, and washing with water until the pH is 6.5 - 7.5.

[0011] In an embodiment of the present invention, the alkali solution is selected from one or more of NaOH solution, KOH solution, Ca(OH)₂ solution, and Ba(OH)₂ solution; The mass concentration of the alkali solution is 10% - 19%.

[0012] In an embodiment of the present invention, the temperature of the water bath heating is 80°C - 100°C, and the time is 40 min - 60 min.

[0013] In an embodiment of the present invention, in S1, the wet-laying process is as follows: Pour the alkali-treated corn straw fiber suspension slurry into a square paper former, blow and stir, perform rapid dehydration and vacuum dehydration. Under the action of negative pressure suction, the fibers are deposited on the forming curtain to form a corn straw fiber web. Take out the corn straw fiber web, compact it with a felt roller, transfer it to a tray, and place it in an oven at 60°C - 100°C for drying for 3 h - 6 h.

[0014] In an embodiment of the present invention, in S1, the mass concentration of the suspended corn straw fibers is 1% - 3%. The concentration affects the uniformity of the corn straw fiber web, and thus affects the use performance of the corn straw fiber-based nonwoven composite material. In this concentration range, the fibers have good dispersibility and are evenly distributed after being on the net, ensuring the forming structure.

[0015] In one embodiment of the present invention, in S2, the temperature of the hot rolling is 140°C - 160°C, the pressure is 5 MPa - 7 MPa, and the time is 3 min - 5 min.

[0016] In one embodiment of the present invention, in S2, the degradable film is selected from one or more of chitin-based films, polylactic acid (PLA) films, and aliphatic and aromatic copolymer films.

[0017] Furthermore, the aliphatic and aromatic copolymer film is selected from polybutylene adipate terephthalate (PBAT) films.

[0018] The second object of the present invention is to provide a corn straw fiber-based nonwoven composite material prepared by the method described above.

[0019] The third object of the present invention is to provide an application of the corn straw fiber-based nonwoven composite material in flowerpots.

[0020] The technical solution of the present invention has the following advantages compared with the prior art:

[0021] (1) The corn straw fiber-based nonwoven composite material of the present invention is prepared from the agricultural waste resource of corn straw. This composite material has multiple excellent properties and wide applications. It turns waste corn straw into a valuable resource, achieving the sustainable development of resources and the environment.

[0022] (2) The corn straw fiber-based nonwoven composite material of the present invention does not require the addition of other fillers during the preparation process. It only contains natural corn straw fibers, with pure raw materials and environmental friendliness, and can significantly reduce costs.

[0023] (3) The present invention uses a nonwoven wet-laying process and a hot rolling process with a degradable film to prepare the corn straw fiber-based nonwoven composite material. There is no need to grind the straw material, etc. The process flow is simple, and the raw materials can maintain the fiber state.

[0024] (4) The raw material of the corn straw fiber-based nonwoven composite material of the present invention is natural cellulose fiber, which can be completely degraded and will not cause pressure on the environment.

[0025] (5) The corn straw fiber-based nonwoven composite material described in the present invention has obvious advantages and development potential in improving plant health when used in degradable gardening flowerpots. The young roots of plants have limited air permeability, water absorption, and nutrient absorption rate in traditional non-degradable plastic flowerpots, and the transplantation process of plastic flowerpots may damage the young roots, forming infection sites for soil-borne pathogens. The corn straw fiber-based nonwoven composite material described in the present invention used in degradable gardening flowerpots has a certain water absorption rate, water retention rate, and air permeability. As the plants are planted in the soil, after biodegradation, it is converted into water and carbon dioxide, releasing nutrients, which can increase the organic carbon content of the soil and promote the growth of plants. Description of the Drawings

[0026] In order to make the content of the present invention more clearly understood, the following further describes the present invention in detail according to the specific embodiments of the present invention in combination with the drawings, where:

[0027] Figure 1 It is the macroscopic morphology diagram of the corn straw fiber-based nonwoven composite material of Test Example 1 of the present invention;

[0028] Figure 2 It is the SEM morphology diagram of the cross-section of the corn straw fiber-based nonwoven composite material after tensile fracture of Test Example 4 of the present invention at different magnifications;

[0029] Figure 3 It is the weight change of the corn straw fiber-based nonwoven composite material within 25 days of Test Example 6 of the present invention;

[0030] Figure 4 It is the SEM morphology diagram of the corn straw fiber-based nonwoven composite material within 25 days of Test Example 6 of the present invention; where (a) is the original state, (b) is after 5 days of soil burial test, (c) is after 10 days of soil burial test, (d) is after 15 days of soil burial test, (e) is after 20 days of soil burial test, (f) is after 5 days of rooftop placement, (g) is after 10 days of rooftop placement, (h) is after 15 days of rooftop placement, (i) is after 20 days of rooftop placement;

[0031] Figure 5 It is the appearance diagram of the flowerpot of Test Example 7 of the present invention;

[0032] Figure 6 It is the physical diagram of the soil-cultivated Chlorophytum seedlings of Test Example 7 of the present invention; where a-b is the 1st day of cultivation, c-d is the 25th day of cultivation;

[0033] Figure 7 It is the root diagram of the soil-cultivated Chlorophytum seedlings of Test Example 7 of the present invention; where a-c is before soil cultivation, d-f is after 25 days of soil cultivation; the left column is the root comparison of Pot No. 1, the middle column is the root comparison of Pot No. 2, and the right column is the root comparison of Pot No. 3. Detailed Embodiments

[0034] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and be able to implement it, but the exemplified embodiments are not intended to limit the present invention.

[0035] In the present invention, unless otherwise specified, the PBAT / chitin degradable film is purchased from Wuxi Xingyang Plastic Packaging Factory, with a width of 50 cm and a weight of 6 kg per roll.

[0036] Example 1

[0037] The corn straw fiber-based nonwoven composite material of the present invention and its preparation method specifically include the following steps:

[0038] S1. Pretreatment and alkali treatment of corn straw fibers: Weigh 240 g of corn straw with a precision balance, take 2.4 L of deionized water, submerge the straw with the water surface, heat it in a water bath at 100 °C for 20 min, then adjust the temperature to 80 °C and heat for 100 min, stirring while heating to fully soak and heat the corn straw. After the straw becomes soft, cut its length to 1 ± 0.2 cm. Then take out the beaker, filter out the water, pour in a NaOH solution with a mass concentration of 19%, and heat it in a water bath at 90 °C for 50 min. After the water bath heating is completed, let it stand and cool, filter and wash with a single-layer cotton gauze until the pH of the washing water is neutral, and store the corn straw fibers in a refrigerator at 4 °C.

[0039] S2. Preparation of corn straw fiber web: Take 240 g of alkali-treated corn straw fibers, pour them into water, start a standard fiber disintegrator, with a rotation speed of 1200 r / min and a time of 6 min, to make a suspension with a mass concentration of 1.68% in which the fibers are evenly dispersed. Pour it into a square sheet former, blow and stir, quickly dehydrate and vacuum dehydrate. Under the action of negative pressure suction, the fibers are deposited on a forming curtain with a specification of 32 cm × 32 cm to form a corn straw fiber web. Then take out the corn straw fiber web, compact it with a felt roller, transfer it to a tray, and dry it in an oven at 80 °C for 5 h.

[0040] S3. Preparation of corn straw fiber-based nonwoven composite material: Adjust the temperature of the manual hot rolling forming machine to 150 °C, the pressure to 5 MPa, and the time to 3 min. Bond the two sides of the above-mentioned obtained corn straw fiber web to the PBAT / chitin degradable film, and put it into a pressing plate to obtain a three-layer-structured corn straw fiber-based nonwoven composite material.

[0041] Test Example 1 Morphology Observation

[0042] Fix the specimen on the sample stage with conductive adhesive. After spraying gold in a vacuum gold plating device, use a scanning electron microscope to observe the morphology of the corn straw fiber-based non-woven composite material prepared in Example 1. The results are as Figure 1 shown. It can be seen from Figure 1 that the composite of the PBAT / chitin biodegradable film and the corn straw fiber web is not completely uniformly smooth, and there are a few pores between the PBAT / chitin biodegradable film and the corn straw fiber web, making the material have a certain air permeability.

[0043] Test Example 2 Thickness Measurement

[0044] Based on Example 1, use a digital display outside micrometer to measure the thickness of the corn straw fiber web and the corn straw fiber-based non-woven composite material. Adjust the measuring rod to the initial position, zero the value, rotate the differential cylinder, place the material between the measuring surfaces, adjust the measuring rod to the appropriate position, and take the reading. Measure different positions of the same specimen and take the average value. The average value of the thickness of the corn straw fiber-based non-woven composite material measured by the digital display outside micrometer is (0.959 ± 0.004) mm, the original thickness of the corn straw fiber web is (2.500 ± 0.020) mm, and the thickness of the material decreases after hot rolling reinforcement with the film, strengthening the bonding between fibers.

[0045] Test Example 3 Determination of the Mass Ratio of the PBAT / Chitin Biodegradable Film

[0046] Prepare corn straw fiber-based non-woven composite materials and PBAT / chitin biodegradable films with a specification of 5 cm × 5 cm. Use a precision balance to weigh the masses of the corn straw fiber-based non-woven composite materials and the PBAT / chitin biodegradable films respectively, and calculate the mass ratio of two PBAT / chitin biodegradable films to one corn straw fiber-based non-woven composite material, which is the mass ratio of the PBAT / chitin biodegradable film relative to the corn straw fiber-based non-woven composite material. Measure three groups of data and take the average value. By measuring the masses of the PBAT / chitin biodegradable film and the corn straw fiber-based non-woven composite material, it is calculated that the mass ratio of the PBAT / chitin biodegradable film relative to the corn straw fiber-based non-woven composite material is (5.00 ± 0.06)%, indicating that the proportion of the PBAT / chitin biodegradable film in the corn straw fiber-based non-woven composite material is very small and can be almost ignored.

[0047] Test Example 4 Mechanical Property Test

[0048] The mechanical properties of the corn straw fiber-based nonwoven composite prepared in Example 1 were tested. The tensile strength of the composite was tested according to GB / T 24218.3-2010. The specifications of the tensile specimens were approximately 250 mm × 50 mm (length × width), and three specimens were taken in both the longitudinal and transverse directions. A universal material testing machine was used for testing. The clamping distance of the tensile tester was 200 mm ± 1 mm, and the specimens were clamped at the center position of the clamp. All specimens were stretched at a constant elongation rate of 100 mm / min under a pre-tension of 10 N until fracture. Each of the longitudinal and transverse directions was tested 3 times, and the average values of the breaking strength and elongation at break were taken. The breaking strength of the composite was calculated by the following formula:

[0049]

[0050] where: F is the breaking strength (N), and A is the cross-sectional area at break (mm 2 )

[0051] Table 1 shows the test results of the mechanical properties of the corn straw fiber-based nonwoven composite:

[0052] Table 1 Mechanical property data of the corn straw fiber-based nonwoven composite

[0053]

[0054] As can be seen from Table 1, the corn straw fiber-based nonwoven composite has good mechanical properties. The average breaking strength in the longitudinal direction is (187.23 ± 16.23) N, the average breaking strength in the transverse direction is (147.43 ± 10.56) N, and the strength ratio of the longitudinal to transverse directions is 1.27. The average elongation at break in the longitudinal and transverse directions is (0.50 ± 0.08)% and (0.48 ± 0.07)% respectively. The variation range of the longitudinal and transverse breaking strengths of the composite is 6.15 MPa - 7.81 MPa, which is higher than the flowerpot strengths of Sphagnum moss (≈1.2 MPa), cow dung (≈2 MPa), and wood fiber (≈1 MPa) reported by Zhang et al. (Zhang X, et al. Properties of selected biodegradable seedling plug-trays. Scientia Horticulturae, 2019. 249: p.177 - 184.).

[0055] After the tensile fracture test of the corn straw fiber-based nonwoven composite specimens, the SEM micrographs of the fracture surfaces can explain the structural integrity of the composite, as Figure 2 shown. As can be seen from Figure 2 , there are a large number of finer fibers in the corn straw fiber-based nonwoven composite, which increases the effective bonding area between the fibers and between the fibers and the film.

[0056] Test Example 5 Air Permeability Test

[0057] Using a YG461E-Ⅲ full-automatic air permeability tester, the test was carried out in accordance with the standard of GB / T 24218.15-2018. The test pressure difference was 100 Pa, and the test area was 20 cm 3 . The air permeability tests were respectively carried out on the corn straw fiber web and the corn straw fiber-based nonwoven composite material of Example 1. Each sample was tested 5 times, and the average value was calculated.

[0058] The average air permeability rate of the corn straw fiber web was 4.534 mm / s, while that of the corn straw fiber-based nonwoven composite material was -0.01 mm / s. It was observed under SEM that the PBAT / chitin degradable film gradually degraded with the increase of soil burial time, and the pores in the corn straw fiber web gradually increased. Therefore, the air permeability rate of the corn straw fiber-based nonwoven composite material during the degradation process was between two extreme values. As the composite material continued to degrade, the air permeability increased, which was beneficial to the growth of plants.

[0059] Test Example 6 Degradability Test

[0060] Samples with a size of 5 cm×5 cm (the corn straw fiber-based nonwoven composite material of Example 1) were placed in an 80°C vacuum oven and dried for 0.5 h, and then weighed (W1). Subsequently, these sheets were buried in a pit with a length of 10 cm, a width of 10 cm, and a depth of 8 cm.

[0061] During the entire experimental period (from April 20, 2023 to May 14, 2023), samples were taken every 5 days until all samples were taken out. After taking out, the samples were cleaned with a brush to remove the soil on the surface of the samples, and then dried in an 80°C vacuum oven for 0.5 h and weighed (W2). The weight loss percentage of the corn straw fiber-based nonwoven composite material was calculated by the following formula:[[]]

[0062]

[0063] Samples of the same specification were placed on the rooftop as a control group to explore the biodegradation performance of the corn straw fiber-based nonwoven composite material under the conditions of wind, sun and rain. The results are as Figure 3 shown.

[0064] From Figure 3It can be seen that the initial mass of both the soil-buried specimen and the rooftop specimen is 1.6750 g. After 25 days, the masses are (1.5991 ± 0.0026) g and (1.6198 ± 0.0020) g respectively, and the mass loss rates are 4.53% and 3.30% respectively. This indicates that the corn straw fiber-based nonwoven composite material has degradability. The mass loss of the composite material in both environments shows a linear relationship with time, and the mass of the corn straw fiber-based nonwoven composite material decreases with the extension of time. Compared with the placement condition on the rooftop, the degradation degree of the corn straw fiber-based nonwoven composite material is higher under the soil burial condition.

[0065] The morphology of the corn straw fiber-based nonwoven composite material before and after degradation in two environments was observed under SEM, and the results are as Figure 4 shown. From Figure 4 it can be seen that within 20 days, the PBAT / chitin degradable film gradually degrades. As time goes by, larger holes appear on the film surface, the binding tightness between the PBAT / chitin degradable film and the corn straw fiber network decreases, air bubbles appear, and the fiber aggregates are gradually exposed on the surface. The PBAT / chitin degradable film buried in the soil is more obviously damaged and has more holes, indicating that the degradation degree of this corn straw fiber-based nonwoven composite material is higher in the soil, which is consistent with the mass loss result of the corn straw fiber-based nonwoven composite material.

[0066] Test Example 7 Application Test

[0067] (1) Flowerpot molding: Cut the corn straw fiber-based nonwoven composite material into two parts, which are used as the flowerpot wall and the flowerpot bottom respectively. Immerse the material in a water bath at 40 °C for 10 s. After the material becomes soft, make it into a flowerpot shape, fix the shape, and put it into an oven at 80 °C for drying for 2 h. After drying, use the PVA solution to bond and reinforce the flowerpot wall and the bottom, and thus complete the preparation of the flowerpot as Figure 5 shown.

[0068] (2) Seedling cultivation

[0069] To reduce experimental errors and ensure the normal growth of the plants, first cultivate the Chlorophytum seedlings in water for 5 days. Use a beaker with a specification of 250 g, and submerge the roots of the Chlorophytum seedlings with 1 cm of water for hydroponics.

[0070] After the cultivation in water is completed, randomly select 3 Chlorophytum seedlings during normal growth, measure the average leaf length, and then plant them into two biodegradable flowerpots and one plastic flowerpot respectively, denoted as No. 1, No. 2, and No. 3. Each Chlorophytum seedling is cultivated with 450 g of soil. On the first day of planting, each flowerpot is watered with 100 mL of water, and then watered once every two days, with a watering amount of 70 mL each time. No fertilizers are applied to the seedlings during the growth period.

[0071] After 25 days, the Chlorophytum seedlings were taken out of the flower pots, the average leaf length of the plants was measured, and the roots of the seedlings were observed with the naked eye. The growth of the plants was photographed and recorded as Figure 6 shown. From Figure 6 it can be seen that after 25 days of soil cultivation, the growth of plant leaves, root growth, and flower pot degradation were observed with the naked eye. It was found that the seedlings in the degradable flower pots and the control group all grew healthily without any abnormalities. Within 25 days, the average leaf growth of Chlorophytum seedlings in flower pots No. 1, 2, and 3 was 2.5 cm, 2.3 cm, and 2.6 cm respectively, and there was no significant difference among the data.

[0072] Chlorophytum has two types of roots. One is the capillary root that can be used to absorb water, and the other is the thick radish-shaped root that is beneficial for storing water. The different root morphologies are formed in the process of plant evolution to continuously adapt to the environment for survival and growth. By observing the growth of the roots, the water retention rate of the flower pot can be judged, and the results are as Figure 7 shown. From Figure 7 it can be seen that although the young roots in all three flower pots grew normally after 25 days, there were obvious differences in the root growth of the seedlings in flower pots No. 1, 2 and No. 3. Four radish-shaped roots grew on the roots of Chlorophytum in flower pot No. 1, and six relatively thick radish-shaped roots grew on the roots of flower pot No. 2, indicating that the growth environment was suitable and the watering was regular. The main function of such roots is to store water and nutrients and is suitable for growing in the soil. Two radish-shaped roots grew in flower pot No. 3, mostly slender white fibrous roots. When the amount of water poured is sufficient and the leaves are saturated with water absorption, thick radish-shaped roots are easily formed to store excess water, and this mechanism can improve the drought tolerance of Chlorophytum. During the experiment, the same amount of water was poured into all three flower pots. From this, it can be seen that compared with plastic flower pots, the degradable flower pots have a higher water retention rate. During this period, the structures of flower pots No. 1 and 2 showed slight deformation but no cracks and remained intact within 28 days after planting Chlorophytum seedlings, showing sufficient mechanical strength.

[0073] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A preparation method of a corn straw fiber-based non-woven composite material, characterized in that, It includes the following steps: S1. Pretreat the corn straw through alkali treatment and wet-laying process to obtain a corn straw fiber web; The extraction of the pretreated corn straw includes the following steps: Boil and heat the corn straw solution. After the corn straw becomes soft, cut its length to 1 ± 0.2 cm to obtain the pretreated corn straw; The boiling and heating are divided into two stages. The first stage is heating at 95°C - 100°C for 20 min - 25 min; The second stage is heating at 80°C - 85°C for 90 min - 100 min; The alkali treatment is to add an alkali solution to the pretreated corn straw, heat it in a water bath, and after cooling, filtering, and washing with water until the pH is 6.5 - 7.5; The process of wet-laying is as follows: Pour the alkali-treated corn straw fiber suspension into a square sheet former, blow and stir, perform rapid dehydration and vacuum dehydration. Under the action of negative pressure suction, the fibers are deposited on the forming curtain to form a corn straw fiber web. Take out the corn straw fiber web, compact it with a felt roller, transfer it to a tray, and place it in an oven at 60°C - 100°C for drying for 3 h - 6 h; The mass concentration of the corn straw fiber suspension is 1% - 3%; S2. Bond biodegradable films on both sides of the corn straw fiber web obtained in S1, and obtain the corn straw fiber-based nonwoven composite material through hot rolling.

2. The preparation method of the corn straw fiber-based nonwoven composite material according to claim 1, characterized in that, The alkali solution is selected from one or more of NaOH solution, KOH solution, Ca(OH)2 solution, and Ba(OH)2 solution; The mass concentration of the alkali solution is 10% - 19%.

3. The preparation method of the corn straw fiber-based nonwoven composite material according to claim 1, characterized in that The temperature of the water bath heating is 80°C - 100°C, and the time is 40 min - 60 min.

4. The preparation method of the corn straw fiber-based nonwoven composite material according to claim 1, characterized in that, In S2, the temperature of the hot rolling is 140°C - 160°C, the pressure is 5 MPa - 7 MPa, and the time is 3 min - 5 min.

5. The corn straw fiber-based nonwoven composite material prepared by the method according to any one of claims 1 - 4.

6. The application of the corn straw fiber-based nonwoven composite material according to claim 5 in flower pots.

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