Environment-friendly soil stabilizer

Abstract

The invention relates to an environment-friendly soil stabilizer which comprises the following components in parts by weight: 10-40 parts of modified polylactic acid, 30-60 parts of wheat straw liquid, 5-20 parts of colloid, 30-60 parts of linseed oil, 15-20 parts of sodium alginate, 10-12 parts of rosin, 25-50 parts of filler and 1-2 parts of sucrose. By adopting the technical scheme, natural components in the wheat straw liquid are combined with a film formed by polylactic acid, so that the crack resistance and durability of soil can be enhanced, the moisture retention capacity of the soil can be improved, and the environmental protection property of the soil stabilizer can be improved by mixed use; the colloid improves the stability and moisture retention capacity of soil, the linseed oil improves the overall structural stability and cohesiveness of the soil and reduces soil cracking, the sodium alginate improves the cohesiveness and overall stability of the soil, the sodium alginate can help to reduce the cracking of the soil and reduce the influence of soil exposure cracking, and the rosin improves the hardness and the adhesiveness, so that the anti-cracking performance of the soil is improved. The cane sugar serving as a component of the soil stabilizer can enhance the cohesiveness and stability of the soil, promote the microbial activity and improve the soil structure at the same time.

Description

Technical Field

[0001] This invention relates to the field of soil stabilizer technology, and more specifically to an environmentally friendly soil stabilizer. Background Technology

[0002] Hardeners play a vital role in modern engineering and construction, particularly in enhancing the strength and durability of materials. However, existing hardeners still have some significant environmental drawbacks, especially regarding their impact on water transport (moisture penetration and transport).

[0003] First, many traditional curing agents are made from petrochemical products, meaning they consume large amounts of fossil fuels and release greenhouse gases such as carbon dioxide during production. These emissions burden the environment and exacerbate global warming. Furthermore, chemically synthesized curing agents often contain volatile organic compounds (VOCs), which escape into the air during application and curing, posing a threat to the environment and human health.

[0004] In terms of water transport, many curing agents alter the pore structure of materials, thus affecting water permeability and transport. This alteration can lead to poor drainage, triggering a range of environmental problems. For example, curing agents make the surface of materials like concrete less permeable, potentially preventing rainwater from effectively infiltrating the ground and exacerbating surface runoff issues in urban areas. This not only increases the burden on urban drainage systems but can also lead to soil erosion and water loss.

[0005] In conclusion, while curing agents are indispensable in modern construction, their environmental drawbacks, particularly regarding hydrophobicity, cannot be ignored. Future development should focus on exploring and applying more sustainable materials and technologies to reduce negative environmental impacts and promote greener building and engineering practices. Summary of the Invention

[0006] In summary, to overcome the shortcomings of the prior art, the present invention provides an environmentally friendly soil stabilizer.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an environmentally friendly soil stabilizer, comprising the following components in parts by weight: 10-40 parts modified polylactic acid, 30-60 parts wheat straw liquid, 5-20 parts colloid, 30-60 parts linseed oil, 15-20 parts sodium alginate, 10-12 parts rosin, 25-50 parts filler, and 1-2 parts sucrose.

[0008] By adopting the above technical solution, modified polylactic acid (PLA) is prepared through bio-based blending modification, exhibiting good biodegradability and water permeability. When mixed with wheat straw liquid, the PLA forms a film that provides physical protection and stability, while the wheat straw liquid, through its natural components, further enhances the soil's cohesion and water retention. The combination of the natural components in the wheat straw liquid and the PLA film enhances the soil's crack resistance and durability, while also improving its moisture retention capacity. Both are environmentally friendly materials; PLA is a biodegradable plastic, and wheat straw liquid is a natural plant extract. Their combined use improves the environmental friendliness of soil stabilizers and reduces negative environmental impacts. Colloidal substances can improve soil stability and moisture retention, and enhance soil strength in the later stages. Linseed oil can react with soil particles to form a durable solidification layer, thereby improving the overall structural stability and cohesion of the soil. After drying in the soil, it forms a flexible film that can effectively reduce surface cracking. Sodium alginate can form a gel-like structure with soil particles, thereby improving soil cohesion and overall stability. Sodium alginate can help reduce soil cracking and mitigate the effects of sun exposure on soil cracking. Rosin enhances soil hardness and cohesion. Sucrose can strengthen soil cohesion and stability, while also promoting microbial activity and improving soil structure.

[0009] The present invention further comprises: the modified polylactic acid is produced by polymerizing agricultural waste pretreated by hydrolysis, followed by lactic acid fermentation and purification, and then adding lignocellulose and using a twin-screw extruder for blending modification.

[0010] By adopting the above technical solutions, these steps can convert agricultural waste into modified polylactic acid, which not only reduces waste and lowers costs, but also contributes to environmental protection and resource recycling. Lignocellulose enhances the mechanical properties and permeability of modified polylactic acid, and melt blending allows PLA to be uniformly mixed with lignocellulose, thereby optimizing permeability and adhesion.

[0011] The present invention further includes the following: the agricultural waste includes wheat stalks, barley stalks, sorghum stalks, corn stalks, grass, and leaves; the hydrolysis pretreatment temperature is 38-60℃; the lactic acid fermentation uses Lactobacillus; and the fermentation temperature is 53-55℃.

[0012] By adopting the above-mentioned technical solutions, agricultural waste can be utilized due to its environmentally friendly and sustainable characteristics.

[0013] The present invention further specifies that the blending ratio of the lignocellulose and polylactic acid polymer is 1:2.

[0014] By adopting the above technical solution, the amount of lignocellulose added will affect the mechanical properties of PLA. A ratio of 1:2 is the optimal ratio, and the resulting modified polylactic acid has the best strength, water permeability and adhesiveness.

[0015] The present invention further includes the addition of modified polypropylene during the blending of the lignocellulose and polylactic acid polymer.

[0016] By adopting the above technical solutions, the compatibility between PLA and lignocellulose is improved, delamination is prevented, or interfacial adhesion is enhanced.

[0017] The present invention further specifies that the adhesive is any one of xanthan gum, gum arabic, or gelatin.

[0018] By adopting the above technical solutions, different adhesives will be used in combination depending on the purpose of the soil stabilizer. Xanthan gum is used in road construction to improve the strength, stability, and durability of the soil because it provides strong and long-lasting protection against traffic loads and environmental changes. Gum arabic is used to prevent soil erosion. The main advantages of gum arabic are its natural source, good adhesion, and biodegradability, making it suitable for applications requiring environmentally friendly and low-toxicity conditions. In agriculture or horticulture, soil stabilizers are used to improve soil structure, enhance soil moisture retention, and improve fertilizer utilization efficiency. The use of gelatin is plant-friendly and has minimal impact on soil and plant growth.

[0019] The present invention further comprises: the filler comprising 10%-30% starch, 10%-30% bentonite, 10%-30% diatomaceous earth and 30%-60% fly ash.

[0020] By adopting the above technical solutions, starch forms a binding force in the soil, which can improve the soil's cohesion and stability; bentonite improves the soil's structure and water retention capacity, enhances soil plasticity, and reduces soil settlement and cracking; diatomaceous earth increases soil permeability and improves soil structure, which helps to improve soil drainage and aeration; and fly ash improves soil strength and stability, effectively increasing soil compressive strength and bearing capacity. Depending on the application of the soil stabilizer, different component ratios will be used. In road construction, the filler is a mixture of 10% starch, 20% bentonite, 10% diatomaceous earth, and 60% fly ash; for preventing soil erosion, the filler is a mixture of 15% starch, 30% bentonite, 15% diatomaceous earth, and 40% fly ash; and for soil improvement in agriculture, the filler is a mixture of 30% starch, 10% bentonite, 30% diatomaceous earth, and 30% fly ash. Detailed Implementation

[0021] The specific embodiments of the present invention will be described in further detail below with reference to the examples. These examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0022] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

[0023] Example 1 - Road Construction

[0024] 1) The formula for the environmentally friendly soil stabilizer is as follows: 20 parts modified polylactic acid, 35 parts wheat straw liquid, 8 parts gel, 60 parts linseed oil, 18 parts sodium alginate, 11 parts rosin, 45 parts filler, and 2 parts sucrose.

[0025] 2) Preparation process of environmentally friendly soil stabilizer:

[0026] 1. Preparation of modified polylactic acid

[0027] S1. Collection and Pretreatment: Collect agricultural waste (such as wheat stalks, barley stalks, sorghum stalks, corn stalks, grass, leaves, etc.), and wash and crush it to increase the surface area.

[0028] S2. Hydrolysis pretreatment: At a temperature of 38-45℃, acidic or enzymatic hydrolysis is used to decompose cellulose and hemicellulose in agricultural waste into fermentable sugars.

[0029] S3. The sugars obtained from the hydrolysis in S2 are fermented with lactic acid bacteria at a fermentation temperature of 53-55℃ to convert them into lactic acid.

[0030] S4. The lactic acid after fermentation needs to be concentrated and purified to remove impurities in order to obtain high-purity lactic acid.

[0031] S5. The purified lactic acid is subjected to a polymerization reaction. Cyclic polylactic acid (lactide) is usually used as the raw material, and polylactic acid polymer is generated through a condensation reaction.

[0032] S6. Mix the dried lignocellulose and polylactic acid polymer at a ratio of 1:2, then add the modified polypropylene and mix evenly using a stirrer at a speed of 500 r / min.

[0033] S7 feeds the mixed materials into a twin-screw extruder for melt blending at a temperature of 180°C. During the extrusion process, the material resides in the screw for 2 minutes, and the pressure inside the extruder is 20 MPa.

[0034] S8. Granulate the cooled modified polylactic acid.

[0035] 2. Preparation of curing agent mixture

[0036] Add wheat straw liquid, sodium alginate, and modified polylactic acid sequentially to a dispersion tank and disperse at 500 rpm. While stirring, add sucrose and xanthan gum and disperse at 800 rpm for 20 minutes until homogeneous. Add rosin at 500 rpm and disperse at 800 rpm for 15 minutes until homogeneous. Add linseed oil at 600 rpm and disperse at 1000 rpm for 5 minutes until homogeneous. Add filler and an appropriate amount of water (the filler is a mixture of 10% starch, 20% bentonite, 10% diatomaceous earth, and 60% fly ash) at 800 rpm and disperse at 1000 rpm for 15 minutes until homogeneous.

[0037] A sample was prepared by adding the curing agent mixture at a dosage of 15% to the asphalt. The various properties of the sample were tested and compared with the properties of the sample after curing with ordinary curing agent at a dosage of 15%.

[0038] (1) Compressive strength

[0039] curing agent 7 days (MP) 15 days (MP) 30 days (MP) Example 1 6.2 7.7 8.9 ordinary curing agent 6.0 5.7 3.2

[0040] (2) Bending tensile strength

[0041] curing agent Flexural tensile strength (MPa) Example 1 0.7 ordinary curing agent 0.3

[0042] (3) Water stability test

[0043]

[0044] (4) Permeability coefficient

[0045]

[0046] Example 2 – Preventing Soil Erosion

[0047] 1) The formula for the environmentally friendly soil stabilizer is: 40 parts modified polylactic acid, 60 parts wheat straw liquid, 12 parts gel, 35 parts linseed oil, 15 parts sodium alginate, 10 parts rosin, 35 parts filler, and 2 parts sucrose.

[0048] 2) Preparation process of environmentally friendly soil stabilizer:

[0049] 1. Preparation of modified polylactic acid

[0050] S1. Collection and Pretreatment: Collect agricultural waste (such as wheat stalks, barley stalks, sorghum stalks, corn stalks, grass, leaves, etc.), and wash and crush it to increase the surface area.

[0051] S2. Hydrolysis pretreatment: At a temperature of 45-52℃, acidic or enzymatic hydrolysis is used to decompose cellulose and hemicellulose in agricultural waste into fermentable sugars.

[0052] S3. The sugars obtained from the hydrolysis in S2 are fermented with lactic acid bacteria at a fermentation temperature of 53-55℃ to convert them into lactic acid.

[0053] S4. The lactic acid after fermentation needs to be concentrated and purified to remove impurities in order to obtain high-purity lactic acid.

[0054] S5. The purified lactic acid is subjected to a polymerization reaction. Cyclic polylactic acid (lactide) is usually used as the raw material, and polylactic acid polymer is generated through a condensation reaction.

[0055] S6. Mix the dried lignocellulose and polylactic acid polymer at a ratio of 1:2, then add the modified polypropylene and mix evenly using a stirrer at a speed of 500 r / min.

[0056] S7 feeds the mixed materials into a twin-screw extruder for melt blending at a temperature of 200°C. During the extrusion process, the material resides in the screw for 3 minutes, and the pressure inside the extruder is 15 MPa.

[0057] S8. Granulate the cooled modified polylactic acid.

[0058] 2. Preparation of curing agent mixture

[0059] Add wheat straw liquid, sodium alginate, and modified polylactic acid sequentially to a dispersion tank and disperse at 600 rpm. While stirring, add sucrose and gum arabic and disperse at 800 rpm for 20 minutes until homogeneous. Add rosin at 600 rpm and disperse at 800 rpm for 15 minutes until homogeneous. Add linseed oil at 800 rpm and disperse at 1000 rpm for 5 minutes until homogeneous. Add filler and an appropriate amount of water (the filler is a mixture of 15% starch, 30% bentonite, 15% diatomaceous earth, and 40% fly ash) at 800 rpm and disperse at 1100 rpm for 15 minutes until homogeneous.

[0060] A sample was prepared by adding the curing agent mixture at a dosage of 15% to sand. The various properties of the sample were tested and compared with the properties of the sample after curing with ordinary curing agent at a dosage of 15%.

[0061] (1) Compressive strength

[0062] curing agent 7 days (MP) 15 days (MP) 30 days (MP) Example 1 5.3 6.6 7.8 ordinary curing agent 2.1 1.5 1.0

[0063] (2) Bending tensile strength

[0064] curing agent Flexural tensile strength (MPa) Example 1 0.5 ordinary curing agent 0.13

[0065] (3) Water stability test

[0066]

[0067]

[0068] (4) Permeability coefficient

[0069]

[0070] Example 3 – Soil Improvement in Agriculture

[0071] 1) The formula for the environmentally friendly soil stabilizer is: 30 parts modified polylactic acid, 50 parts wheat straw liquid, 20 parts gel, 50 parts linseed oil, 20 parts sodium alginate, 12 parts rosin, 30 parts filler, and 1 part sucrose.

[0072] 2) Preparation process of environmentally friendly soil stabilizer:

[0073] 1. Preparation of modified polylactic acid

[0074] S1. Collection and Pretreatment: Collect agricultural waste (such as wheat stalks, barley stalks, sorghum stalks, corn stalks, grass, leaves, etc.), and wash and crush it to increase the surface area.

[0075] S2. Hydrolysis pretreatment: At a temperature of 53-60℃, acidic or enzymatic hydrolysis is used to decompose cellulose and hemicellulose in agricultural waste into fermentable sugars.

[0076] S3. The sugars obtained from the hydrolysis in S2 are fermented with lactic acid bacteria at a fermentation temperature of 53-55℃ to convert them into lactic acid.

[0077] S4. The lactic acid after fermentation needs to be concentrated and purified to remove impurities in order to obtain high-purity lactic acid.

[0078] S5. The purified lactic acid is subjected to a polymerization reaction. Cyclic polylactic acid (lactide) is usually used as the raw material, and polylactic acid polymer is generated through a condensation reaction.

[0079] S6. Mix the dried lignocellulose and polylactic acid polymer at a ratio of 1:2, then add the modified polypropylene and mix evenly using a stirrer at a speed of 500 r / min.

[0080] S7 feeds the mixed materials into a twin-screw extruder for melt blending at a temperature of 220°C. During the extrusion process, the material resides in the screw for 5 minutes, and the pressure inside the extruder is 5 MPa.

[0081] S8. Granulate the cooled modified polylactic acid.

[0082] 2. Preparation of curing agent mixture

[0083] Add wheat straw liquid, sodium alginate, and modified polylactic acid sequentially to a dispersion tank and disperse at 700 rpm. While stirring, add sucrose and gelatin, and disperse at 900 rpm for 20 minutes until homogeneous. Add rosin at 600 rpm and disperse at 900 rpm for 15 minutes until homogeneous. Add linseed oil at 600 rpm and disperse at 1000 rpm for 5 minutes until homogeneous. Add filler and an appropriate amount of water (the filler is a mixture of 30% starch, 10% bentonite, 30% diatomaceous earth, and 30% fly ash) at 900 rpm and disperse at 1200 rpm for 15 minutes until homogeneous.

[0084] A sample was prepared by adding the curing agent mixture at a dosage of 15% to the soil. The various properties of the sample were tested and compared with the properties of the sample after curing with ordinary curing agent at a dosage of 15%.

[0085] (1) Compressive strength

[0086] curing agent 7 days (MP) 15 days (MP) 30 days (MP) Example 1 3.3 5.2 6.7 ordinary curing agent 1.0 0.7 0.2

[0087] (2) Bending tensile strength

[0088] curing agent Flexural tensile strength (MPa) Example 1 0.8 ordinary curing agent 0.11

[0089] (3) Water stability test

[0090]

[0091] (4) Permeability coefficient

[0092]

[0093] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications assumed above should also be considered within the scope of protection of the present invention.

Claims

1. An environmentally friendly soil stabilizer, characterized in that, It comprises the following components in parts by weight: 10-40 parts of modified polylactic acid, 30-60 parts of wheat straw liquid, 5-20 parts of gum, 30-60 parts of linseed oil, 15-20 parts of sodium alginate, 10-12 parts of rosin, 25-50 parts of filler, and 1-2 parts of sucrose.

2. The environment-friendly soil stabilizer according to claim 1, characterized in that: The modified polylactic acid is produced by polymerization after lactic acid fermentation and purification of hydrolysis pretreated agricultural waste, and then wood cellulose is added for blending modification by using a double screw extruder.

3. The environment-friendly soil stabilizer according to claim 2, characterized in that: The agricultural waste includes wheat chaff, barley chaff, sorghum chaff, corn chaff, grass and tree leaves, the hydrolysis pretreatment temperature is 38-60℃, the lactic acid fermentation uses lactobacillus, and the fermentation temperature is 53-55℃.

4. The environment-friendly soil stabilizer according to claim 2, characterized in that: The blending ratio of the wood cellulose and the polylactic acid polymer is 1:

2.

5. The environment-friendly soil stabilizer according to claim 2, characterized in that: Modified polypropylene is added during the blending of the wood cellulose and the polylactic acid polymer.

6. The environment-friendly soil stabilizer according to claim 1, characterized in that: The gum is any one of xanthan gum, gum arabic or gelatin.

7. The environment-friendly soil stabilizer according to claim 1, characterized in that: The filler includes 10%-30% of starch, 10%-30% of bentonite, 10%-30% of diatomite and 30%-60% of fly ash.

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