Polymer modified material as well as preparation method and application thereof

Abstract

The invention relates to a polymer modified material, a preparation method and application thereof, the polymer modified material comprises the following raw materials: loess particles, epoxy resin and a curing agent, the mass ratio of the epoxy resin to the curing agent is (10-11): (4-5); the mass ratio of the loess particles to the sum of the epoxy resin and the curing agent is (97-98): (2-3); the preparation method comprises the following steps: sieving loess with a 12-16-mesh sieve to obtain loess particles with the particle size of less than 2mm; the preparation method comprises the following steps: uniformly mixing epoxy resin and a curing agent according to a mass ratio of (10-11): (4-5) to obtain a mixture A; adding the mixture A into the loess particles until the mixture A is uniformly distributed in the loess particles, and naturally air-drying the obtained mixture B at normal temperature for 2-7 days to completely cure the epoxy resin on the surfaces of the loess particles, thereby finally obtaining the polymer modified material. According to the invention, a layer of polymer film is attached to the surface of loess particles to protect the particles from collapsing when encountering water, and meanwhile, the modified material has better pollutant adsorption capacity.

Description

Technical Field

[0001] The invention belongs to the technical field of polymer modified materials, and specifically relates to a polymer modified material, a preparation method and application thereof. Background Art

[0002] The acceleration of urbanization has increased the speed and flow of rainwater runoff, and carried various pollutants into receiving water bodies, thus deteriorating water quality. Urban rainwater management facilities have the functions of reducing runoff peaks and improving water quality. These functions are mainly affected by fillers. The main components of traditional fillers are usually sand, clay and organic matter, and the removal effect of dissolved pollutants (nitrogen and phosphorus) is not stable. At the same time, the mining of sand and gravel will not only damage the safety of the river and the ecological environment, but also because sand and gravel is a heavy resource, long-distance transportation will result in relatively high transportation costs. Therefore, it is necessary to find an alternative filler.

[0003] Loess is found in northwest China, Central Asia, the Middle East, Russia, and North America. It is a cheap, easily available, and environmentally friendly raw material. As a silicate mineral, it is mainly composed of fine sand and clay minerals, and the clay part of it gives loess the functional properties of adsorption. If loess can be used to build rainwater management facilities in the loess region, it can greatly save construction costs and achieve energy conservation and emission reduction. However, its porous structure and unique water sensitivity cause it to collapse and deform when it encounters water, and its permeability cannot meet the requirements of fillers, so it cannot be used directly as fillers. In order to make the permeability of loess meet the requirements, it needs to be modified in advance.

[0004] As an environmentally friendly polymer, waterborne epoxy resin is a liquid phase system material with water as the dispersion medium and epoxy resin as the dispersed phase. In recent years, it has been widely used in industries such as aerospace, building materials and electronic communications. As a new type of environmentally friendly modifier, waterborne epoxy resin has many excellent properties. On the one hand, it can generate a continuously cross-linked polymer network after reacting with a curing agent, thereby providing many useful engineering properties such as thermal stability, bonding strength and waterproof properties. Using waterborne epoxy resin to modify asphalt can change it from a hydrophilic state to a hydrophobic state, which has hydrophobicity and anti-icing properties. On the other hand, epoxy resin can also be used as a functional adsorbent for adsorbing azo dyes and metal cations (Cu(II), Cd(II) and Pb(II)) in aqueous solution.

[0005] The patent application with the publication number CN114074986A discloses a bioretention pond filler, which is composed of farmland soil, sawdust, volcanic rock, biochar and sandy loam. The volume ratio of farmland soil, sawdust, volcanic rock, biochar and sandy loam is (25-40): (0-15): (0-10): (0-20): (0-15), the amount of yellow sand, biochar and sandy loam is not zero, and the filler height is 400-800mm. The use of this filler ratio can intercept insoluble phosphorus in rainwater, promote the growth of hydrolytic bacteria, accelerate the hydrolysis reaction process of insoluble phosphorus, adsorb soluble phosphorus, and achieve rapid and thorough removal of phosphorus through the interception-hydrolysis-adsorption process; however, most of the materials required for the filler need to be purchased and transported, which is not convenient enough, and the bioretention pond filler is not adapted to local conditions. Secondly, the proportion of volcanic rock and biochar in the filler is relatively large, which greatly increases the construction cost of the bioretention pond. Summary of the invention

[0006] In order to overcome the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide a polymer modified material, a preparation method and its application, by forming a layer of polymer film generated by the reaction of bisphenol A diglycidyl ether type epoxy resin and 4'4-sulfonyl dianiline on the surface of loess particles, so that the particles are protected from rainwater and no longer sink. The preparation method is simple in process, and the raw materials are environmentally friendly and inexpensive; the polymer modified material has high water stability and strong pollutant adsorption capacity, and is suitable for the growth and reproduction of various microorganisms; using the polymer modified material as filler for rainwater management facilities can effectively remove pollutants in runoff and prevent runoff discharge from causing deterioration of the urban water environment.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] A polymer modified material, the raw materials of which include loess particles, epoxy resin and curing agent, the mass ratio of the epoxy resin to the curing agent is (10-11): (4-5); the mass ratio of the loess particles to the sum of the epoxy resin and the curing agent is (97-98): (2-3).

[0009] The epoxy resin is bisphenol A diglycidyl ether type epoxy resin, and the curing agent is 4'4-sulfonyl dianiline.

[0010] The particle size of the loess is less than 2 mm.

[0011] A method for preparing a polymer modified material comprises the following steps:

[0012] Step 1: Pass the loess through a 12-16 mesh sieve to obtain loess particles with a particle size of less than 2 mm;

[0013] Step 2: Evenly mix the epoxy resin and the curing agent to obtain a mixture A, wherein the mass ratio of epoxy resin: curing agent is (10-11): (4-5); add the mixture A to the loess particles obtained in step 1 by using a stirrer until the mixture A is evenly distributed in the loess particles to obtain a mixture B, wherein the mass ratio of loess particles: mixture A is (97-98): (2-3);

[0014] Step 3: The mixture B obtained in step 2 is naturally air-dried at room temperature for 2-7 days to completely solidify the epoxy resin on the surface of the loess particles, and finally a polymer modified material is obtained.

[0015] The epoxy resin is bisphenol A diglycidyl ether type epoxy resin, and the curing agent is 4'4-sulfonyl dianiline.

[0016] An application of a polymer modified material, using the polymer modified material prepared as above as filler for rainwater management facilities for runoff control.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention protects the loess particles from being submerged in water by attaching a polymer film formed by the reaction of bisphenol A diglycidyl ether epoxy resin and 4'4-sulfonyl dianiline on the surface of the loess particles, while at the same time enabling the modified material to have a better pollutant adsorption capacity; the present invention solves the problem that plain loess cannot be directly used as a filler due to its poor water permeability.

[0019] 2. The materials used in the present invention have a wide range of applications, are environmentally friendly, have simple processing techniques, and are low in price. The use of loess to prepare in-situ fillers not only enables the construction of rainwater management facilities to use local materials, but also has good rainwater runoff treatment capabilities.

[0020] 3. The present invention uses epoxy resin as a polymer modifier, and the epoxy resin is a bisphenol A diglycidyl ether epoxy resin, which can not only be completely and evenly attached to the surface of loess particles during the preparation process, but also has no toxicity to the environment, and is an environmentally friendly material. The process of modifying loess with epoxy resin is simple and has strong promotional potential.

[0021] 4. After a large number of experiments, the ratio of loess particles, epoxy resin and curing agent in the present invention is selected as bisphenol A diglycidyl ether epoxy resin and 4'4-sulfonyl dianiline in a mass ratio of (10-11): (4-5) to obtain mixture A; the mass ratio of loess particles and mixture A is (97-98): (2-3) to obtain mixture B; the mixture B is naturally air-dried at room temperature for 2-7 days to completely cure the epoxy resin on the surface of the loess particles, and finally a polymer modified material is obtained; the results show that the permeability of the polymer modified loess material prepared by the present invention meets the parameter requirements of rainwater treatment facilities. At the same time, it can also effectively remove pollutants such as nitrogen and phosphorus in runoff.

[0022] In summary, by modifying loess particles with polymers, the construction of rainwater management facilities can be adapted to local conditions. A polymer modification method suitable for loess improvement has been found, which gives it good rainwater control capabilities. At the same time, when polymer modified materials are used as fillers, they allow a variety of microorganisms to grow and reproduce on their surfaces. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with examples. The described examples and their results are only used for the present invention, and should not and will not limit the present invention described in the claims.

[0024] A polymer modified material, the raw materials of which include loess particles, epoxy resin and curing agent, the mass ratio of the epoxy resin to the curing agent is (10-11): (4-5); the mass ratio of the loess particles to the sum of the epoxy resin and the curing agent is (97-98): (2-3).

[0025] The epoxy resin is bisphenol A diglycidyl ether type epoxy resin, and the curing agent is 4'4-sulfonyl dianiline.

[0026] The particle size of the loess is less than 2 mm.

[0027] A method for preparing a polymer modified material comprises the following steps:

[0028] Step 1: Pass the loess through a 12-16 mesh sieve to obtain loess particles with a particle size of less than 2 mm;

[0029] Step 2: Evenly mix bisphenol A diglycidyl ether epoxy resin and 4'4-sulfonyl dianiline to obtain a mixture A, wherein the mass ratio of bisphenol A diglycidyl ether epoxy resin: 4'4-sulfonyl dianiline is (10-11): (4-5); Add the mixture A to the loess particles obtained in step 1 by using a stirrer and stir continuously for 10-15 minutes until the mixture A is evenly distributed in the loess particles to obtain a mixture B, wherein the mass ratio of loess particles: mixture A is (97-98): (2-3);

[0030] Step 3: The mixture B obtained in step 2 is naturally air-dried at room temperature for 2-7 days to completely cure the epoxy resin on the surface of the loess particles, and finally a polymer modified material is obtained.

[0031] An application of a polymer modified material, using the polymer modified material prepared as above as filler for rainwater management facilities for runoff control.

[0032] Example 1

[0033] Loess: Sampling from Bailuyuan, Xi'an.

[0034] Epoxy resin: bisphenol A diglycidyl ether type epoxy resin.

[0035] Curing agent: 4'4-sulfonyl dianiline.

[0036] A polymer modified material, whose raw materials include loess particles, epoxy resin and curing agent, the mass ratio of the epoxy resin to the curing agent is 10:5; the mass ratio of the loess particles to the sum of the epoxy resin and the curing agent is 98:2.

[0037] The epoxy resin is bisphenol A diglycidyl ether type epoxy resin, and the curing agent is 4'4-sulfonyl dianiline.

[0038] The particle size of the loess is less than 2 mm.

[0039] A method for preparing a polymer modified material comprises the following steps:

[0040] Step 1: Pass the loess through a 12-mesh sieve to obtain loess particles with a particle size of less than 2 mm;

[0041] Step 2: Evenly mix bisphenol A diglycidyl ether epoxy resin and 4'4-sulfonyl dianiline to obtain a mixture A, wherein the mass ratio of bisphenol A diglycidyl ether epoxy resin to 4'4-sulfonyl dianiline is 10:5; add the mixture A to the loess particles obtained in step 1 by using a stirrer and stir continuously for 10 minutes until the mixture A is evenly distributed in the loess particles to obtain a mixture B, wherein the mass ratio of loess particles to mixture A is 98:2;

[0042] Step 3: The mixture B obtained in step 2 is naturally air-dried at room temperature for 2 days to completely cure the epoxy resin on the surface of the loess particles, and finally a polymer modified material is obtained.

[0043] Example 2

[0044] Loess: Sampling from Bailuyuan, Xi'an.

[0045] Epoxy resin: bisphenol A diglycidyl ether type epoxy resin.

[0046] Curing agent: 4'4-sulfonyl dianiline.

[0047] A polymer modified material, whose raw materials include loess particles, epoxy resin and curing agent, the mass ratio of the epoxy resin to the curing agent is 11:4; the mass ratio of the loess particles to the sum of the epoxy resin and the curing agent is 98:2.

[0048] A method for preparing a polymer modified material comprises the following steps:

[0049] Step 1: Pass the loess through a 12-mesh sieve to obtain loess particles with a particle size of less than 2 mm;

[0050] Step 2: Evenly mix bisphenol A diglycidyl ether epoxy resin and 4'4-sulfonyl dianiline to obtain a mixture A, wherein the mass ratio of bisphenol A diglycidyl ether epoxy resin to 4'4-sulfonyl dianiline is 11:4; add the mixture A to the loess particles obtained in step 1 by using a stirrer and stir continuously for 10 minutes until the mixture A is evenly distributed in the loess particles to obtain a mixture B, wherein the mass ratio of loess particles to mixture A is 98:2;

[0051] Step 3: The mixture B obtained in step 2 is naturally air-dried at room temperature for 7 days to completely cure the epoxy resin on the surface of the loess particles, and finally a polymer modified material is obtained.

[0052] Example 3

[0053] Loess: Sampling from Bailuyuan, Xi'an.

[0054] Epoxy resin: bisphenol A diglycidyl ether type epoxy resin.

[0055] Curing agent: 4'4-sulfonyl dianiline.

[0056] A polymer modified material, whose raw materials include loess particles, epoxy resin and curing agent, the mass ratio of the epoxy resin to the curing agent is 11:4; the mass ratio of the loess particles to the sum of the epoxy resin and the curing agent is 97.5:2.5.

[0057] A method for preparing a polymer modified material comprises the following steps:

[0058] Step 1: Pass the loess through a 16-mesh sieve to obtain loess particles with a particle size of less than 2 mm;

[0059] Step 2: Evenly mix bisphenol A diglycidyl ether epoxy resin and 4'4-sulfonyl dianiline to obtain a mixture A, wherein the mass ratio of bisphenol A diglycidyl ether epoxy resin to 4'4-sulfonyl dianiline is 11:4; add the mixture A to the loess particles obtained in step 1 by using a stirrer and stir continuously for 10 minutes until the mixture A is evenly distributed in the loess particles to obtain a mixture B, wherein the mass ratio of loess particles to mixture A is 97.5:2.5;

[0060] Step 3: The mixture B obtained in step 2 is naturally air-dried at room temperature for 2 days to completely cure the epoxy resin on the surface of the loess particles, and finally a polymer modified material is obtained.

[0061] Example 4

[0062] Loess: Sampling from Bailuyuan, Xi'an.

[0063] Epoxy resin: bisphenol A diglycidyl ether type epoxy resin.

[0064] Curing agent: 4'4-sulfonyl dianiline.

[0065] A polymer modified material, whose raw materials include loess particles, epoxy resin and curing agent, the mass ratio of the epoxy resin to the curing agent is 10.5:4.5; the mass ratio of the loess particles to the sum of the epoxy resin and the curing agent is 97:3.

[0066] A method for preparing a polymer modified material comprises the following steps:

[0067] Step 1: Pass the loess through a 14-mesh sieve to obtain loess particles with a particle size of less than 2 mm;

[0068] Step 2: Evenly mix bisphenol A diglycidyl ether epoxy resin and 4'4-sulfonyl dianiline to obtain a mixture A, wherein the mass ratio of bisphenol A diglycidyl ether epoxy resin to 4'4-sulfonyl dianiline is 10.5:4.5; add the mixture A to the loess particles obtained in step 1 by using a stirrer and stir continuously for 10 minutes until the mixture A is evenly distributed in the loess particles to obtain a mixture B, wherein the mass ratio of loess particles to mixture A is 97:3;

[0069] Step 3: The mixture B obtained in step 2 is naturally air-dried at room temperature for 7 days to completely cure the epoxy resin on the surface of the loess particles, and finally a polymer modified material is obtained.

[0070] The permeation experiment was carried out using the polymer modified material obtained in step 3 of Example 1-4.

[0071] (1) Penetration test plan

[0072] Stormwater management facilities are designed to reduce stormwater runoff by draining water quickly. In order to ensure that the modified material can meet its hydrophobic properties as a filler, its permeability coefficient should be within a certain range of values. The permeability coefficient is determined using a constant head permeability test.

[0073] (2) Penetration test results and analysis

[0074] The permeability coefficient of unmodified loess is less than 0.1 cm / h. The addition of epoxy resin in the present invention has a great influence on the permeability coefficient of modified loess. This is because the epoxy resin can wrap the loess particles to form a continuously cross-linked polymer network, so that a hydrophobic film is formed on the surface of the loess. From the test results, the permeability coefficients of all modified materials meet the requirements (143.39-150.94 mm / h).

[0075] The composition of the polymer modified material obtained in step 3 of Example 1-4 was analyzed.

[0076] (1) Component test plan

[0077] The modified materials were characterized by X-ray diffractometer (XRD) (D8 Advance, Bruker, Germany) to evaluate the changes in their crystal structure and chemical composition. The functional groups of the modified materials were analyzed by Fourier transform infrared spectrometer (FITR) (Tensor-27, Germany) in the spectral range of 400-4000 cm-1.

[0078] (2) Component test results and analysis

[0079] Compared with plain loess, no change in mineral composition was observed in the polymer modified material prepared by the present invention. Moreover, the peak intensity and position of the modified loess remain basically unchanged, which indicates that no new substances are generated in the modified loess. This shows that the hydrophobic modification of loess is only carried out on the surface of the loess and will not affect the crystal composition of the loess. Fourier infrared spectroscopy can observe some obvious differences after modification. The bands at 1184 and 1248 cm-1 that are unique to the modified loess are CN formed by the reaction of the epoxy ring with the secondary amine. -OH has a strong and wide asymmetric stretching vibration absorption peak in the range of 3000 to 3750 cm-1, which may be -OH formed by the reaction of the epoxy ring with the secondary amine. At the same time, there are stretching vibration absorption peaks at 875, 1441, 1637 and corresponding to COC, CH and C=C respectively. Compared with the in-situ loess, the peak intensities of these peaks in the modified loess are significantly improved. The enhancement of these groups all comes from the corresponding groups in the epoxy resin, which indicates that the surface of the loess particles is coated with epoxy resin.

[0080] The pollutant adsorption test was carried out using the polymer modified material obtained in step 3 of Example 1-4.

[0081] (1) Pollutant adsorption test plan

[0082] In 50mL 8mg / L NH4 + -N solution (8mg / L PO4 3- -P solution) was added with 2g of modified material, shaken at 150r / min at 25℃, and samples were taken at different time intervals to determine NH4 + -N(PO4 3- -P) concentration.

[0083] (2) Pollutant adsorption test results and analysis

[0084] NH4 + -N and PO4 3- The adsorption of -P on polymer modified materials may be mainly controlled by chemical reactions, such as NH4 + -N and PO4 3- The complexation between -P and the oxygen-containing functional group hydroxyl (-OH) on the surface. The polymer modified material prepared by the present invention adsorbs at a faster adsorption rate in the first 4 hours. During this period, most of the active sites are occupied, and the maximum adsorption capacity is slowly reached after 4 hours. In addition, the NH4 + -N equilibrium adsorption capacity is 0.16939 mg / g, PO4 3- The equilibrium adsorption capacity of -P is even as high as 0.41282 mg / g, which is because the abundant hydroxyl groups in the polymer modified material can improve the adsorption of phosphate.

[0085] The polymer modified material obtained in step 3 of Example 1-4 was used to carry out a simulated runoff purification test.

[0086] (1) Simulated runoff purification test plan

[0087] The modified materials were used to build rainwater management facilities, with and without flooding areas. The experiment set up rainfall events with low, medium and high rainfall intensities and dry periods of 2 days, 4 days and 8 days. + -N、NO3 - -N, TP and COD concentrations were 8 mg / L, 8 mg / L, 2 mg / L and 100 mg / L respectively. All effluents from the stormwater management facilities were collected for each rainfall and the content of each pollutant was determined.

[0088] (2) Simulated runoff purification test results and analysis

[0089] The ammonia nitrogen effluent concentration of the facility is significantly lower, because the ammonia nitrogen equilibrium adsorption capacity of the polymer modified material prepared by the present invention is about 2 times larger than that of the traditional filler, and it can adsorb more ammonia nitrogen. The rainfall intensity and drought period have little effect on the ammonia nitrogen removal effect of the facility. The facility has better and more stable nitrate nitrogen removal efficiency in both flooded and non-flooded areas. The rainwater management facility has better treatment performance even at high rainfall intensities. Overall, the total nitrogen effluent concentration of the facility is low. The setting of the flooded area will greatly improve the denitrification efficiency of the facility. The rainwater management facility constructed with polymer modified materials can stably and efficiently remove TN even under unfavorable conditions where the rainfall intensity increases. Rainfall intensity and drought period have no significant effect on the phosphorus removal effect of the facility. The facility has an outstanding phosphorus removal effect, because the specific surface area and PO4 of the polymer modified material are 3- -P adsorption capacity is relatively large.

[0090] The polymer modified material obtained in step 3 of Example 1-4 was used to conduct a microbial sequencing test.

[0091] (1) Microbial sequencing protocol

[0092] After the simulated rainfall test, the fillers in the facility were collected and 16S rRNA sequencing was performed for the V3 and V4 regions using primers 338F and 806R, followed by OTU cluster analysis, species classification analysis, and in-depth statistical analysis of community structure. Microbial diversity indicators such as Shannon, Simpson, and Chao 1 were used to evaluate the alpha diversity in the samples, and Venn diagrams and principal coordinate analysis (PCoA) were used to evaluate the beta diversity in the samples. The FAPROTAX database was used to further predict the metabolic pathways and functions of bacteria.

[0093] (2) Microbial sequencing test results and analysis

[0094] The Chao1 value of the facility with a flooded area is higher than that of the facility without a flooded area, which means that the setting of the flooded area is conducive to the growth and reproduction of microorganisms. Secondly, the facility constructed with the polymer modified material prepared by the present invention does not significantly affect the richness and diversity of microorganisms because the flooded area is not set. At the phylum level, Proteobacteria, Actinobacteriot, Chloroflexi and Bacteroidota are dominant phyla. The bacterial flora related to nitrogen conversion in the facility mainly includes nitrifying bacteria such as Ellin6067, denitrifying bacteria such as Sphingobium, Rhizobium, Novosphingobium, Pseudomonas, Zoogloea and Massilia, and DNRA bacteria such as Arthrobacter. Denitrifying bacteria are dominant in the facility, mainly Sphingobium, Rhizobium and Novosphin gobium, accounting for 36.66% and 31.02% of the total number of microbial sequences, which is also the reason why the polymer material performs well in denitrification performance. C cycle and N cycle are the main functions of bacteria in the facility, because the main metabolic activity of the facility is the biodegradation of organic matter and nitrogen. Many functional genes related to N metabolism were observed, including nitrate reduction, nitrate respiration, nitrogen respiration, nitrite respiration, denitrification, nitrous oxide denitrification, nitrite denitrification, and nitrate denitrification.

Claims

1. A polymer modified material, characterized in that: The raw materials include loess particles, epoxy resin and curing agent, wherein the mass ratio of the epoxy resin and the curing agent is (10-11):(4-5); the mass ratio of the loess particles to the sum of the epoxy resin and the curing agent is (97-98):(2-3).

2. A polymer modified material according to claim 1, characterized in that: The epoxy resin is bisphenol A diglycidyl ether type epoxy resin, and the curing agent is 4'4-sulfonyl dianiline.

3. A polymer modified material according to claim 1, characterized in that: The particle size of the loess is less than 2 mm.

4. A method for preparing a polymer modified material, characterized in that: The following steps are involved: Step 1: Pass the loess through a 12-16 mesh sieve to obtain loess particles with a particle size of less than 2 mm; Step 2: Evenly mix the epoxy resin and the curing agent to obtain a mixture A, wherein the mass ratio of epoxy resin: curing agent is (10-11): (4-5); add the mixture A to the loess particles obtained in step 1 by using a stirrer until the mixture A is evenly distributed in the loess particles to obtain a mixture B, wherein the mass ratio of loess particles: mixture A is (97-98): (2-3); Step 3: The mixture B obtained in step 2 is naturally air-dried at room temperature for 2-7 days to completely cure the epoxy resin on the surface of the loess particles, and finally a polymer modified material is obtained.

5. The method for preparing a polymer modified material according to claim 4, characterized in that: The epoxy resin is bisphenol A diglycidyl ether type epoxy resin, and the curing agent is 4'4-sulfonyl dianiline.

6. The method for preparing a polymer modified material according to claim 4, characterized in that: The following steps are involved: Step 1: Pass the loess through a 12-mesh sieve to obtain loess particles with a particle size of less than 2 mm; Step 2: Evenly mix bisphenol A diglycidyl ether epoxy resin and 4'4-sulfonyl dianiline to obtain a mixture A, wherein the mass ratio of bisphenol A diglycidyl ether epoxy resin to 4'4-sulfonyl dianiline is 10:5; add the mixture A to the loess particles obtained in step 1 by using a stirrer and stir continuously for 10 minutes until the mixture A is evenly distributed in the loess particles to obtain a mixture B, wherein the mass ratio of loess particles to mixture A is 98:2; Step 3: The mixture B obtained in step 2 is naturally air-dried at room temperature for 2 days to completely cure the epoxy resin on the surface of the loess particles, and finally a polymer modified material is obtained.

7. The method for preparing a polymer modified material according to claim 4, characterized in that: The following steps are involved: Step 1: Pass the loess through a 12-mesh sieve to obtain loess particles with a particle size of less than 2 mm; Step 2: Evenly mix bisphenol A diglycidyl ether epoxy resin and 4'4-sulfonyl dianiline to obtain a mixture A, wherein the mass ratio of bisphenol A diglycidyl ether epoxy resin to 4'4-sulfonyl dianiline is 11:4; add the mixture A to the loess particles obtained in step 1 by using a stirrer and stir continuously for 10 minutes until the mixture A is evenly distributed in the loess particles to obtain a mixture B, wherein the mass ratio of loess particles to mixture A is 98:2; Step 3: The mixture B obtained in step 2 is naturally air-dried at room temperature for 7 days to completely cure the epoxy resin on the surface of the loess particles, and finally a polymer modified material is obtained.

8. The method for preparing a polymer modified material according to claim 4, characterized in that: The following steps are involved: Step 1: Pass the loess through a 16-mesh sieve to obtain loess particles with a particle size of less than 2 mm; Step 2: Evenly mix bisphenol A diglycidyl ether epoxy resin and 4'4-sulfonyl dianiline to obtain a mixture A, wherein the mass ratio of bisphenol A diglycidyl ether epoxy resin to 4'4-sulfonyl dianiline is 11:4; add the mixture A to the loess particles obtained in step 1 by using a stirrer and stir continuously for 10 minutes until the mixture A is evenly distributed in the loess particles to obtain a mixture B, wherein the mass ratio of loess particles to mixture A is 97.5:2.5; Step 3: The mixture B obtained in step 2 is naturally air-dried at room temperature for 2 days to completely cure the epoxy resin on the surface of the loess particles, and finally a polymer modified material is obtained.

9. The method for preparing a polymer modified material according to claim 4, characterized in that: The following steps are involved: Step 1: Pass the loess through a 14-mesh sieve to obtain loess particles with a particle size of less than 2 mm; Step 2: Evenly mix bisphenol A diglycidyl ether epoxy resin and 4'4-sulfonyl dianiline to obtain a mixture A, wherein the mass ratio of bisphenol A diglycidyl ether epoxy resin to 4'4-sulfonyl dianiline is 10.5:4.5; add the mixture A to the loess particles obtained in step 1 by using a stirrer and stir continuously for 10 minutes until the mixture A is evenly distributed in the loess particles to obtain a mixture B, wherein the mass ratio of loess particles to mixture A is 97:3; Step 3: The mixture B obtained in step 2 is naturally air-dried at room temperature for 7 days to completely cure the epoxy resin on the surface of the loess particles, and finally a polymer modified material is obtained.

10. An application of a polymer modified material, using the polymer modified material described in any one of claims 1 to 3 or the polymer modified material prepared by any one of the methods of claims 4 to 9 as a filler for rainwater management facilities for runoff control.