Water-retaining soil stabilizer, and preparation method and use thereof

Abstract

A water-retaining soil stabilizer comprising an epoxy resin e.g. bisphenol A; an ambient temperature stabilizer e.g an aliphatic amine; an ambient temperature foamer; a water-absorbent polymer and a surfactant. Also shown is a method and use thereof wherein an ambient temperature foamer is combined with a water-absorbent polymer, and an epoxy resin is foamed at ambient temperature due to exothermic characteristics thereof during stabilization; after combined soil is stabilized and molded, the water-absorbent polymer absorbs water and expands through sufficient watering and infiltration to fully fill inside air bubbles of the epoxy resin, thereby realizing the water-retaining function. The soil stabilizer uses the epoxy resin as a bonding skeleton to endow the combined soil an excellent mechanical strength, such that the combined soil using the soil stabilizer exhibits both water-retaining function and mechanical strength.

Description

TECHNICAL FIELD

[0001] The present disclosure belongs to the technical field of stabilizing admixtures, and specifically relates to a water-retaining soil stabilizer, and a preparation method and use thereof. BACKGROUND

[0002] Soil, as an extremely cost-effective engineering material, can absorb water and expand in humid environments, while the evaporation of water in dry environments can cause the colloidal particles to shrink. This repeated volume change has caused problems such as low strength and unstable performance of the soil. In order to solve the above problems, many scientists have conducted in-depth research on soil stabilization technology. In recent years, soil improvement technology has made great progress, and the materials used to improve soil have also been upgraded from traditional materials such as lime, cement, and fly ash to new materials for soil stabilization -soil stabilizers.

[0003] Soil stabilizer is a new chemical material that is generally used together with inorganic admixtures such as cement and lime, and can increase soil strength and improve soil compaction by changing soil composition and soil engineering properties. According to different technical requirements, many types of soil stabilizers have been derived, such as widely applied and hugely consumed traditional soil sabilizers of cement-based stabilizers, lime-based stabilizers, and magnesium-based stabilizers, and novel soil stabilizers with an excellent performance including water glass-based stabilizers, phosphate-based stabilizers, and alkali-activated stabilizers. Existing soil stabilizers are mainly used in traditional fields such as road construction, and research thereon is mainly focused on improving water resistance. However, for potential new application fields of soil stabilizers such as desert control and landscaping, relevant research information on the novel soil stabilizers with a water-retaining function has not been reported. SUMMARY

[0004] In view of the above, an object of the present disclosure is to provide a water-retaining soil stabilizer, and a preparation method and use thereof. In the present disclosure, the water-retaining soil stabilizer has both water-retaining function and excellent mechanical strength.

[0005] To achieve the above object, the present disclosure provides the following technical solutions:

[0006] The present disclosure provides a water-retaining soil stabilizer, including the following components in parts by mass:

[0007] 20 parts to 50 parts of an epoxy resin, 10 parts to 30 parts of an ambient temperature stabilizer, 5 parts to 15 parts of an ambient temperature foamer, 10 parts to 25 parts of a water-absorbent polymer, and 3 parts to 8 parts of a surfactant.

[0008] In some embodiments, the epoxy resin includes at least one selected from the group consisting of a bisphenol A epoxy resin and a bisphenol F epoxy resin.

[0009] In some embodiments, the ambient temperature stabilizer is at least one selected from the group consisting of an aliphatic amine and a polyether amine.

[0010] In some embodiments, the ambient temperature foamer is at least one selected from the group consisting of a physical ambient temperature foamer and a chemical ambient temperature foamer.

[0011] In some embodiments, the water-absorbent polymer includes at least one selected from the group consisting of polyacrylic acid (PAA), polyvinylpyrrolidone (PVP), hydroxymethyl cellulose (HMC), carboxyethyl cellulose (CEC), gelatinized starch, and sodium carboxymethyl starch (CMS-Na).

[0012] In some embodiments, the surfactant includes at least one selected from the group consisting of Tween-20, OP-10, Tween-60, Tween-80, Span-20, Span-80, Span-60, tetraethylene glycol monolaurate, polyoxyethylated castor oil, and polyoxyethylene stearate.

[0013] The present disclosure further provides a method for preparing the water-retaining soil stabilizer as described above, including the following steps:

[0014] mixing the epoxy resin, the ambient temperature stabilizer, the ambient temperature foamer, the water-absorbent polymer, and the surfactant to obtain the water-retaining soil stabilizer.

[0015] The present disclosure further provides use of the water-retaining soil stabilizer as described above or the water-retaining soil stabilizer prepared by the method as described above in soil stabilization.

[0016] The present disclosure further provides a method for soil stabilization, including: mixing soil, a water-retaining soil stabilizer, and a gel material to obtain a mixture, and compacting the mixture; where

[0017] the water-retaining soil stabilizer is the water-retaining soil stabilizer described above or the water-retaining soil stabilizer prepared by the method described above.

[0018] In some embodiments, a volume ratio of the water-retaining soil stabilizer to the soil is in a range of (300-500): 1000.

[0019] The present disclosure provides a water-retaining soil stabilizer, including the following components in parts by mass: 20 parts to 50 parts of an epoxy resin, 10 parts to 30 parts of an ambient temperature stabilizer, 5 parts to 15 parts of an ambient temperature foamer, 10 parts to 25 parts of a water-absorbent polymer, and 3 parts to 8 parts of a surfactant.

[0020] In the present disclosure, an ambient temperature foamer is combined with a water-absorbent polymer, and an epoxy resin is foamed at ambient temperature due to the exothermic characteristics thereof during stabilization; after combined soil is stabilized and molded, the water-absorbent polymer absorbs water and expands through sufficient watering and infiltration to fully fill the inside air bubbles of the epoxy resin, thereby realizing the water-retaining function. Meanwhile, the soil stabilizer uses the epoxy resin as a bonding skeleton to endow the combined soil of the epoxy resin stabilizing system an excellent mechanical strength, such that the combined soil using the soil stabilizer exhibits both water-retaining function and mechanical strength. The water-retaining soil stabilizer has the functions of water absorption and slow release, which can significantly slow down the evaporation of water in the soil and provide a stable long-term moisture guarantee for green vegetation transplantation and desert control and the like. Therefore, this soil stabilizer can be widely used in desert control and landscaping water retention and other fields. The combined soil using this soil stabilizer can provide sufficient water to the roots of vegetation for a long time in areas with drought and / or high heat, ensuring their survival. Therefore, the water-retaining soil stabilizer is an excellent new specialized soil stabilizer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The present disclosure provides a water-retaining soil stabilizer, including or consisting of the following components in parts by mass:

[0022] 20 parts to 50 parts of an epoxy resin, 10 parts to 30 parts of an ambient temperature stabilizer, 5 parts to 15 parts of an ambient temperature foamer, 10 parts to 25 parts of a water-absorbent polymer, and 3 parts to 8 parts of a surfactant.

[0023] In the present disclosure, unless otherwise specified, there is no special requirements for sources of the used raw materials, and commercially-available products well known to those skilled in the art may be used.

[0024] In the present disclosure, the water-retaining soil stabilizer includes, in parts by mass, 20 parts to 50 parts, preferably 25 parts to 35 parts of the epoxy resin. In some embodiments, the epoxy resin includes at least one selected from the group consisting of a bisphenol A epoxy resin and a bisphenol F epoxy resin, preferably is the bisphenol A epoxy resin or the bisphenol F epoxy resin. When the epoxy resin includes more than one type of epoxy resin, there is no special limitation on a ratio of different types of the epoxy resin, and any ratio can be used.

[0025] In the present disclosure, based on 20-50 parts by mass of the epoxy resin, the water-retaining soil stabilizer includes 10 parts to 30 parts, preferably 15 parts to 20 parts of the ambient temperature stabilizer. In some embodiments of the present disclosure, the ambient temperature stabilizer is at least one selected from the group consisting of an aliphatic amine and a polyether amine, preferably is the aliphatic amine or the polyether amine. When the ambient temperature stabilizer includes more than one type of the ambient temperature stabilizer, there is no special limitation on a ratio of different types of the ambient temperature stabilizer, and any ratio can be used.

[0026] In the present disclosure, based on 20-50 parts by mass of the epoxy resin, the water-retaining soil stabilizer includes 5 parts to 15 parts, preferably 8 parts to 10 parts of the ambient temperature foamer. In some embodiments of the present disclosure, the ambient temperature foamer is at least one selected from the group consisting of a physical ambient temperature foamer and a chemical ambient temperature foamer, preferably is the physical ambient temperature foamer; in some embodiments, the physical ambient temperature foamer is at least one selected from the group consisting of an organic solvent with a boiling point not higher than 70 °C and a fluorine-containing alkane, preferably is an organic solvent with a boiling point of 40 °C to 70 °C; in some embodiments, the fluorine-containing alkane includes at least one selected from the group consisting of trichlorofluoromethane, trichlorotrifluoroethane, and dichlorodifluoromethane, preferably is trichlorofluoromethane; in some embodiments, the chemical ambient temperature foamer includes at least one selected from the group consisting of ammonium bicarbonate, an aluminum powder, and a zinc powder, preferably is ammonium bicarbonate or zinc powder. When the ambient temperature foamer includes more than one type of the ambient temperature foamer, there is no special limitation on a ratio of different types of the ambient temperature foamer, and any ratio may be used.

[0027] In the present disclosure, the ambient temperature foamer mainly foams by producing gases such as carbon dioxide, ammonia, and hydrogen through thermal decomposition or displacement reaction.

[0028] In the present disclosure, based on 20-50 parts by mass of the epoxy resin, the water-retaining soil stabilizer includes 10 parts to 25 parts, preferably 15 parts to 20 parts of the water-absorbent polymer. In some embodiments, the water-absorbent polymer includes at least one selected from the group consisting of PAA, PVP, HMC, CEC, gelatinized starch, and CMS-Na, preferably is PAA, PVP, or HMC. When the water-absorbent polymer includes more than one type of the water-absorbent polymer, there is no special limitation on a ratio of different types of the water-absorbent polymer, and any ratio may be used.

[0029] In the present disclosure, based on 20-50 parts by mass of the epoxy resin, the water-retaining soil stabilizer includes 3 parts to 8 parts, preferably 4 parts to 6 parts of the surfactant. In some embodiments, the surfactant includes at least one selected from the group consisting of Tween-20 (polyoxyethylene sorbitan monolaurate), OP-10 (octylphenol polyoxyethylene ether-10), Tween-60 (polyoxyethylene sorbitan stearate), Tween-80 (polyoxyethylene sorbitan monooleate), Span-20 (sorbitan monolaurate), Span-80 (sorbitan oleate), Span-60 (sorbitan monostearate), tetraethylene glycol monolaurate, polyoxyethylated castor oil, and polyoxyethylene stearate, preferably is the ploysorbate-20, tetraethylene glycol monolaurate, or poly oxy ethylated castor oil. When the surfactant includes more than one type of the surfactant, there is no special limitation on a ratio of different types of the surfactant, and any ratio may be used.

[0030] In the present disclosure, the surfactant is mainly to reduce surface tension, and improve the compatibility of ambient temperature foamer, water-absorbent polymer, and epoxy resin, which plays an important role in promoting the structure and stability of foaming.

[0031] In the present disclosure, an ambient temperature foamer is combined with a water-absorbent polymer, and an epoxy resin is foamed at ambient temperature due to exothermic characteristics thereof during stabilization; after combined soil is stabilized and molded, the water-absorbent polymer absorbs water and expands through sufficient watering and infiltration to fully fill inside air bubbles of the epoxy resin, thereby realizing a water-retaining function. Meanwhile, the soil stabilizer uses the epoxy resin as a bonding skeleton to endow the combined soil of the epoxy resin stabilization an excellent mechanical strength, such that the combined soil using the soil stabilizer exhibits both water-retaining function and mechanical strength.

[0032] The present disclosure further provides a method for preparing the water-retaining soil stabilizer of the above technical solutions, including or consisting of the following steps:

[0033] mixing the epoxy resin, the ambient temperature stabilizer, the ambient temperature foamer, the water-absorbent polymer, and the surfactant to obtain the water-retaining soil stabilizer.

[0034] In some embodiments of the present disclosure, mixing the epoxy resin, ambient temperature stabilizer, ambient temperature foamer, water-absorbent polymer, and surfactant is conducted by:

[0035] subjecting the epoxy resin, the water-absorbent polymer, and the surfactant to first mixing to obtain a component A;

[0036] subjecting the ambient temperature stabilizer and the ambient temperature foamer to second mixing to obtain a component B; and

[0037] subjecting the component A and component B to third mixing.

[0038] In some embodiments of the present disclosure, the first mixing is conducted by first dispersion mixing; in some embodiments, the first dispersion mixing is conducted at a rotate speed of 800 r / min to 1,200 r / min, preferably 900 r / min to 1,000 r / min; and in some embodiments, the first mixing is conducted for 10 min to 20 min, preferably 12 min to 15 min.

[0039] In some embodiments of the present disclosure, the second mixing is conducted by second dispersion mixing; in some embodiments, the second dispersion mixing is conducted at a rotate speed of 800 r / min to 1,200 r / min, preferably 900 r / min to 1,000 r / min; and in some embodiments, the second mixing is conducted for 10 min to 20 min, preferably 12 min to 15 min.

[0040] In some embodiments of the present disclosure, the third mixing is conducted by third dispersion mixing; in some embodiments, the third dispersion mixing is conducted at a rotate speed of 300 r / min to 500 r / min, preferably 350 r / min to 400 r / min; and in some embodiments, the third mixing is conducted for 10 min to 20 min, preferably 12 min to 15 min.

[0041] In the present disclosure, each component is mixed uniformly through dispersion.

[0042] The present disclosure further provides use of the water-retaining soil stabilizer of the above technical solutions or the water-retaining soil stabilizer prepared by the method of the above technical solutions in soil stabilization.

[0043] In some embodiments of the present disclosure, the use includes or consists of at least one selected from the group consisting of desert control and landscaping water retention, and preferably the desert control.

[0044] The present disclosure further provides a method for soil stabilization, including or consisting of mixing soil, a water-retaining soil stabilizer, and a gel material to obtain a mixture, and compacting the mixture; where

[0045] the water-retaining soil stabilizer is the water-retaining soil stabilizer of the above technical solutions or the water-retaining soil stabilizer prepared by the method of the above technical solutions.

[0046] In some embodiments of the present disclosure, the gel material includes at least one selected from the group consisting of cement and quicklime, preferably includes the cement and quicklime; in some embodiments, the cement is PO425 cement. There is no special limitation on a proportion of the cement and quicklime, any proportion may be used.

[0047] In some embodiments of the present disclosure, a volume ratio of the water-retaining soil stabilizer to the soil is in a range of (300-500): 1000, preferably (350-400): 1000; and a ratio of the soil to the gel material is in a range of 1 m3: 60 kg.

[0048] In the present disclosure, there is no special limitation on the compaction, and a compaction process well known in the art may be used.

[0049] This water-retaining soil stabilizer has the functions of water absorption and slow release, which can significantly slow down the evaporation of water in the soil and provide a stable long-term moisture guarantee for green vegetation transplantation and desert control and the like. Therefore, this soil stabilizer can be widely used in fields such as desert control and landscaping water conservation. The combined soil using this soil stabilizer can provide sufficient water to the roots of vegetation for a long time in areas with drought and / or high heat, ensuring their survival. Therefore, the water-retaining soil stabilizer is an excellent new specialized soil stabilizer.

[0050] The technical solutions of the present disclosure will be described below clearly and completely with reference to the examples in the present disclosure, but they shall not be construed as limiting the scope of the present disclosure.

[0051] Example 1

[0052] A water-retaining soil stabilizer consisted of the following components in parts by mass:

[0053] 40 parts of a bisphenol A epoxy resin, 20 parts of an aliphatic amine, 10 parts of tri chlorofluoromethane, 25 parts of PAA, and 5 parts of ploysorbate-20.

[0054] The water-retaining soil stabilizer was prepared by a method as follows:

[0055] the bisphenol A epoxy resin, PAA, and ploysorbate-20 were placed in a first dispersion machine and dispersed at 1,000 r / min for 15 min to obtain a component A;

[0056] the aliphatic amine and tri chlorofluoromethane were placed in a second dispersion machine and dispersed at 1,000 r / min for 15 min to obtain a component B; and

[0057] the component A and component B were placed in a third dispersion machine and dispersed at 400 r / min for 15 min to obtain the water-retaining soil stabilizer.

[0058] Example 2

[0059] A water-retaining soil stabilizer consisted of the following components in parts by mass:

[0060] 30 parts of a bisphenol F epoxy resin, 20 parts of a polyether amine, 15 parts of a zinc powder, 25 parts of PVP, and 3 parts of polyoxyethylated castor oil.

[0061] The water-retaining soil stabilizer was prepared by a method as follows:

[0062] the bisphenol F epoxy resin, PVP, and polyoxy ethylated castor oil were placed in a first dispersion machine and dispersed at 900 r / min for 20 min to obtain a component A;

[0063] the polyether amine and zinc powder were placed in a second dispersion machine and dispersed at 900 r / min for 20 min to obtain a component B; and

[0064] the component A and component B were placed in a third dispersion and dispersed at 350 r / min for 20 min to obtain the water-retaining soil stabilizer.

[0065] Examples

[0066] A water-retaining soil stabilizer consisted of the following components in parts by mass:

[0067] 40 parts of a bisphenol A epoxy resin, 10 parts of an aliphatic amine, 10 parts of a polyether amine, 12 parts of ammonium bicarbonate, 20 parts of HMC, and 8 parts of tetraethylene glycol monolaurate.

[0068] The water-retaining soil stabilizer was prepared by a method as follows:

[0069] the bisphenol A epoxy resin, HMC, and tetraethylene glycol monolaurate were placed in a first dispersion machine and dispersed at 1,200 r / min for 12 min to obtain a component A;

[0070] the aliphatic amine, polyether amine, and ammonium bicarbonate were placed in a second dispersion machine and dispersed at 1,200 r / min for 12 min to obtain a component B; and

[0071] the component A and component B were placed in a third dispersion machine and dispersed at 500 r / min for 12 min to obtain the water-retaining soil stabilizer.

[0072] Comparative Example 1

[0073] A soil stabilizer consisted of the following components in parts by mass:

[0074] 45 parts of a bisphenol A epoxy resin, 20 parts of an aliphatic amine, 15 parts of tri chlorofluoromethane, and 20 parts of CMS-Na.

[0075] The water-retaining soil stabilizer was prepared by a method as follows:

[0076] the bisphenol A epoxy resin and CMS-Na were placed in a first dispersion machine and dispersed at 300 r / min for 5 min to obtain a component A;

[0077] the aliphatic amine and trichlorofluoromethane were placed in a second dispersion machine and dispersed at 300 r / min for 5 min to obtain a component B; and

[0078] the component A and component B were placed in a third dispersion machine and dispersed at 200 r / min for 5 min to obtain the soil stabilizer.

[0079] Use Example 1

[0080] 1 m3 of soil, 400 mL of the water-retaining soil stabilizer prepared in Example 1, 30 kg of quicklime, and 30 kg of PO425 cement were mixed and compacted to obtain a stabilized product.

[0081] Performance testing

[0082] The stabilized product obtained in Use Example 1 had a 7-day unconfined compressive strength of 1.5 MPa.

[0083] Although the above examples have described the present disclosure in detail, they are only a part of, not all of, the examples of the present disclosure. Other examples may also be obtained by the skilled based on the examples without creative efforts, and all of these examples shall fall within the scope of the present disclosure.

Claims

1. A water-retaining soil stabilizer, comprising the following components in parts by mass:20 parts to 50 parts of an epoxy resin, 10 parts to 30 parts of an ambient temperature stabilizer, 5 parts to 15 parts of an ambient temperature foamer, 10 parts to 25 parts of a water-absorbent polymer, and 3 parts to 8 parts of a surfactant.

2. The water-retaining soil stabilizer of claim 1, wherein the epoxy resin comprises at least one selected from the group consisting of a bisphenol A epoxy resin and a bisphenol F epoxy resin.

3. The water-retaining soil stabilizer of claim 1, wherein the ambient temperature stabilizer is at least one selected from the group consisting of an aliphatic amine and a polyether amine.

4. The water-retaining soil stabilizer of claim 1, wherein the ambient temperature foamer is at least one selected from the group consisting of a physical ambient temperature foamer and a chemical ambient temperature foamer.

5. The water-retaining soil stabilizer of claim 1, wherein the water-absorbent polymer comprises at least one selected from the group consisting of polyacrylic acid, polyvinylpyrrolidone, hydroxymethyl cellulose, carboxyethyl cellulose, gelatinized starch, and sodium carboxymethyl starch.

6. The water-retaining soil stabilizer of claim 1, wherein the surfactant comprises at least one selected from the group consisting of polyoxyethylene sorbitan monolaurate, octylphenol polyoxyethylene ether-10, polyoxyethylene sorbitan stearate, polyoxyethylene sorbitan monooleate, sorbitan monolaurate, sorbitan oleate, sorbitan monostearate, tetraethylene glycol monolaurate, polyoxyethylated castor oil, and polyoxyethylene stearate.

7. A method for preparing the water-retaining soil stabilizer of any one of claims 1 to 6, comprising the following steps:mixing the epoxy resin, the ambient temperature stabilizer, the ambient temperature foamer, the water-absorbent polymer, and the surfactant to obtain the water-retaining soil stabilizer.

8. Use of the water-retaining soil stabilizer of any one of claims 1 to 6 or a water-retaining soil stabilizer prepared by the method of claim 7 in soil stabilization.

9. A method for soil stabilization, comprising:mixing soil, a water-retaining soil stabilizer, and a gel material to obtain a mixture, and compacting the mixture;wherein the water-retaining soil stabilizer is the water-retaining soil stabilizer of any one of claims 1 to 6 or the water-retaining soil stabilizer prepared by the method of claim 7.

10. The method of claim 9, wherein a volume ratio of the water-retaining soil stabilizer to the soil is in a range of (300-500): 1000.11