Epoxy resin concrete for rainwater well and preparation process thereof

Abstract

The present invention relates to the technical field of concrete, and in particular to epoxy resin concrete for rainwater wells and a preparation process thereof. The present invention mixes cement, silica fume, fine aggregate, coarse aggregate, water reducer, fly ash, modified epoxy resin, curing agent, diluent and water to obtain epoxy concrete slurry, and curing to obtain epoxy resin concrete for rainwater wells with good mechanical properties and anti-aging properties; wherein, the preparation process of the modified epoxy resin is as follows: (1) eugenol and epichlorohydrin are used as raw materials to prepare eugenol glycidyl ether; (2) eugenol glycidyl ether is reacted with 1,1,3,3-tetramethyldisiloxane, and then grafted with 4-isopropylaminodiphenylamine to obtain silicon-containing diol; (3) silicon-containing diol and polyethylene glycol are mixed and reacted with isophorone diisocyanate to obtain silicon-containing polyurethane prepolymer; (4) silicon-containing polyurethane prepolymer is mixed with epoxy resin to obtain modified epoxy resin.

Description

Technical Field

[0001] The invention relates to the technical field of concrete, in particular to epoxy resin concrete for rainwater wells and a preparation process thereof. Background Art

[0002] A rainwater well is a drainage system that is usually installed on both sides of the road. It has holes on its sides that are connected to the drainage pipes, and seepage pipes extending downward at the bottom, which can replenish rainwater into the ground and drain excess rainwater through the drainage pipes.

[0003] At present, in urban construction, the materials commonly used for rainwater well shells are usually cast iron or concrete. Since the production of cast iron materials requires a large amount of cast iron, the cost is relatively high, and since cast iron materials are easily rusted after being continuously washed by rainwater, the materials are corroded and damaged. Not only is the cost high, but it may also bring safety hazards to vehicles and passers-by on rainy days and at night; and concrete materials also have the disadvantages of low flexural strength, poor toughness, easy breakage, and short life. Although the existing technology modifies the concrete material by adding epoxy resin to improve the strength of the matrix, the epoxy resin itself also has the problem of poor toughness, and long-term environmental factors such as humidity, heat, and light will also accelerate the aging of the epoxy resin material, resulting in its performance degradation. Summary of the invention

[0004] The object of the present invention is to provide an epoxy resin concrete for rainwater wells and a preparation process thereof, so as to solve the problems raised in the above-mentioned background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: an epoxy resin concrete for rainwater wells and a preparation process thereof, comprising the following steps:

[0006] Step 1:

[0007] Add eugenol to epichlorohydrin, use benzyltriethylammonium chloride as a catalyst, heat to 100-105°C under a nitrogen environment, stir for 3-5 hours, cool to 50-60°C, add a sodium hydroxide solution with a mass concentration of 30-40% at a constant pressure, control the addition time to be 30-60 minutes, react for 5-6 hours after the addition, filter the product, wash the filtrate with deionized water, remove excess epichlorohydrin by vacuum rotary evaporation, cool and recrystallize the remaining material with methanol-free, and vacuum dry to obtain eugenol glycidyl ether;

[0008] Step 2:

[0009] Dissolve chloroplatinic acid in isopropanol and place it in a dark environment for 24 to 30 hours to obtain a chloroplatinic acid-isopropanol solution with a concentration of 0.02 to 0.03 g / mL; disperse eugenol glycidyl ether in anhydrous toluene, heat it to 60 to 70°C in a nitrogen environment, add 1,1,3,3-tetramethyldisiloxane, use chloroplatinic acid-isopropanol solution as a catalyst, keep the temperature for reaction for 48 to 56 hours, add 4-isopropylaminodiphenylamine, use salicylic acid as a catalyst, and react at 85 to 100°C for 8 to 10 hours; remove impurities by pressure distillation to obtain a silicon-containing diol;

[0010] Step 3:

[0011] The silicon-containing diol and polyethylene glycol are mixed to obtain a mixed diol, and after dehydration at 100-120° C., isophorone diisocyanate is added to the mixed diol, and dibutyltin dilaurate is used as a catalyst to react at 70-80° C. for 2-3 hours to obtain a silicon-containing polyurethane prepolymer;

[0012] Step 4:

[0013] S1: mixing and stirring the silicon-containing polyurethane prepolymer and bisphenol A epoxy resin for 1 to 2 hours to obtain a modified epoxy resin;

[0014] S2: mixing cement, silica fume, fine aggregate, coarse aggregate, water reducing agent, fly ash, modified epoxy resin, curing agent, diluent and water, and stirring to obtain epoxy resin concrete slurry;

[0015] S3: After pouring the epoxy resin concrete slurry, vibration pressure molding is carried out under a vacuum degree of 0.3~0.5MPa, the pressure is 140~150KN, the time is 75~100s, the vibration force is 120~130KN, and the vibration frequency is 150~180 times / second; after sealing for 24h, demoulding is carried out, and curing is carried out for 28 days in an environment of 25~30℃ and relative humidity greater than 95% to obtain epoxy resin concrete for rainwater wells.

[0016] Furthermore, in step 1, the molar ratio of eugenol, epichlorohydrin and sodium hydroxide is 1:(3-4.5):(2-3).

[0017] Furthermore, in step 2, the molar ratio of eugenol glycidyl ether, 1,1,3,3-tetramethyldisiloxane, and 4-isopropylaminodiphenylamine is 2:1:2.

[0018] Furthermore, in step 3, the silicon-containing diol and polyethylene glycol are mixed in a mass ratio of 1:(3-5) to obtain a mixed diol.

[0019] Furthermore, in step 3, isophorone diisocyanate is added to the mixed diol at a molar ratio of hydroxyl group to isocyanate group of 1:(1.5-1.8).

[0020] Furthermore, in S1, the contents of the components in the modified epoxy resin are, by weight percentage, 12-20% of the silicon-containing polyurethane prepolymer and 80-88% of the bisphenol A epoxy resin.

[0021] Furthermore, in S2, the content of each component in the epoxy resin concrete slurry, by weight, is 100 parts of cement, 5-20 parts of silica fume, 120-140 parts of fine aggregate, 150-160 parts of coarse aggregate, 3-5 parts of water reducer, 20-35 parts of fly ash, 8-12 parts of modified epoxy resin, 2-3 parts of curing agent, 1-2 parts of diluent, and 20-25 parts of water.

[0022] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the present invention provides an epoxy resin concrete for rainwater wells and a preparation process thereof, wherein epoxy resin is mixed with cement, silica fume, fine aggregate, coarse aggregate, water reducer, fly ash, curing agent, diluent and water, stirred to obtain epoxy resin concrete slurry, and cured to obtain epoxy resin concrete for rainwater wells. In order to improve the reinforcing effect of epoxy resin in concrete, the present invention prepares a silicon-containing diol, mixes the silicon-containing diol with polyethylene glycol, and then adds diisocyanate to obtain a silicon-containing polyurethane prepolymer; the silicon-containing polyurethane prepolymer is mixed with epoxy resin, which, on the one hand, strengthens the shortcoming of poor toughness of epoxy resin, and on the other hand, chemical crosslinking is generated between the two, thereby increasing the crosslinking density of the resin and improving the compatibility of the two.

[0023] The preparation method of silicon-containing diol is as follows: eugenol and epichlorohydrin are used as raw materials to prepare eugenol glycidyl ether; the double bond of eugenol glycidyl ether is reacted with 1,1,3,3-tetramethyldisiloxane at a molar ratio of 2:1, eugenol glycidyl ether is grafted on two silicon-hydrogen bonds of 1,1,3,3-tetramethyldisiloxane, and 4-isopropylaminodiphenylamine is used as a nucleophilic reagent to attack the epoxy group under acidic conditions to generate a ring-opening reaction, thereby generating amino alcohol and introducing 4-isopropylaminodiphenylamine with anti-aging properties into the molecular chain segment. The flexibility of Si-O-Si bond in silicon-containing diol is better than CC bond, which can improve the toughness of polyurethane prepolymer, and then improve the toughening effect on epoxy resin and enhance the impact strength of epoxy resin; Si-O-Si bond has higher bond energy, so it has better heat resistance. In addition, organic silicon has outstanding hydrophobicity and can improve water resistance; silicon-containing diol has the properties of organic silicon and antioxidant at the same time, so that the two have a synergistic effect on improving the material's resistance to moisture and heat aging. With the improvement of mechanical properties and aging resistance of epoxy resin, its modification effect on concrete materials is better.

[0024] During the experiment, the researchers also found that with the increase in the amount of silicon-containing polyurethane prepolymer, the mechanical properties of the modified epoxy resin showed a trend of first strengthening and then decreasing. When the silicon-containing polyurethane prepolymer is excessive, it will phase separate from the epoxy resin on a macro scale, affecting the modification effect. Therefore, by weight percentage, the amount of silicon-containing polyurethane prepolymer is controlled to be 12-20% of the total amount of modified epoxy resin, the modification effect is the best, and the prepared epoxy resin concrete has the best performance. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Materials and sources used in the present invention: silica fume comes from Sichuan Awende New Materials Co., Ltd., model 960U; cement is ordinary Portland cement, strength P.O52.5, from Jinan Mingzhou Chemical Co., Ltd.; epoxy resin is epoxy resin E44, from Hebei Linyuan Fine Chemical Co., Ltd.; coarse aggregate is crushed stone, particle size 15-20 mm, crushing value 10.5%, apparent density 2715 kg / m 3 , from Shijiazhuang Xubang Mineral Products Processing Co., Ltd.; fine aggregate is machine-made sand with a silica content of >98.5% and a particle size of 1~3mm, from Shijiazhuang Xubang Mineral Products Processing Co., Ltd.; fly ash comes from Hebei Kexu Building Materials Co., Ltd.; purity is 98% and specific surface area is 416m 2 / kg, the water reducer is polycarboxylic acid water reducer, which comes from Nanjing Hongqian Environmental Protection Engineering Co., Ltd., with a water reduction rate of 25% and a fineness of 3%; the curing agent comes from Changzhou Yourui Polymer Materials Co., Ltd., model UR-6290; the diluent comes from Anhui Xinyuan Technology Co., Ltd., model XY686; and the polyethylene glycol comes from Hai'an Guoli Chemical Co., Ltd., model PEG-2000.

[0027] Embodiment 1: An epoxy resin concrete for a rainwater well and a preparation process thereof, comprising the following steps:

[0028] Step 1:

[0029] Eugenol was added to epichlorohydrin, benzyltriethylammonium chloride was used as a catalyst, the temperature was raised to 100°C under a nitrogen environment, stirred for 3 hours, then cooled to 50°C, a sodium hydroxide solution with a mass concentration of 30% was added at a constant pressure, the addition time was controlled to be 30 minutes, and the reaction was carried out for 5 hours after the addition was completed, the product was filtered, the filtrate was washed with deionized water, the excess epichlorohydrin was removed by vacuum rotary evaporation, the remaining material was cooled and recrystallized by methanol-free, and vacuum dried to obtain eugenol glycidyl ether; wherein the molar ratio of eugenol, epichlorohydrin and sodium hydroxide was 1:3:2;

[0030] Step 2:

[0031] Dissolve chloroplatinic acid in isopropanol and place it in a dark environment for 24 hours to obtain a chloroplatinic acid-isopropanol solution with a concentration of 0.02 g / mL; disperse eugenol glycidyl ether in anhydrous toluene, heat it to 60°C in a nitrogen environment, add 1,1,3,3-tetramethyldisiloxane, use chloroplatinic acid-isopropanol solution as a catalyst, keep the temperature for reaction for 48 hours, add 4-isopropylaminodiphenylamine, use salicylic acid as a catalyst, and react at 85°C for 8 hours; remove impurities by pressure distillation to obtain a silicon-containing diol; wherein the molar ratio of eugenol glycidyl ether, 1,1,3,3-tetramethyldisiloxane, and 4-isopropylaminodiphenylamine is 2:1:2;

[0032] Step 3:

[0033] A silicon-containing diol and polyethylene glycol were mixed in a mass ratio of 1:3 to obtain a mixed diol, and after dehydration at 100° C., isophorone diisocyanate was added to the mixed diol in a molar ratio of hydroxyl group to isocyanate group of 1:1.5, and dibutyltin dilaurate was used as a catalyst to react at 70° C. for 2 hours to obtain a silicon-containing polyurethane prepolymer;

[0034] Step 4:

[0035] S1: According to weight percentage, 20% of silicon-containing polyurethane prepolymer and 80% of bisphenol A epoxy resin were mixed and stirred for 1 hour to obtain a modified epoxy resin;

[0036] S2: 100 kg of cement, 18 kg of silica fume, 120 kg of fine aggregate, 160 kg of coarse aggregate, 5 kg of water reducer, 30 kg of fly ash, 8 kg of modified epoxy resin, 3 kg of curing agent, 2 kg of diluent, and 23 kg of water were mixed and stirred to obtain epoxy resin concrete slurry;

[0037] S3: After pouring the epoxy resin concrete slurry, vibration pressure molding is carried out under a vacuum degree of 0.3MPa, the pressure is 150KN, the time is 100s, the vibration force is 120KN, and the vibration frequency is 150 times / second; after sealing for 24h, demoulding is carried out, and curing is carried out for 28 days at 25°C and relative humidity greater than 95% to obtain epoxy resin concrete for rainwater wells.

[0038] Embodiment 2: An epoxy resin concrete for a rainwater well and a preparation process thereof, comprising the following steps:

[0039] Step 1:

[0040] Eugenol was added to epichlorohydrin, benzyltriethylammonium chloride was used as a catalyst, the temperature was raised to 103°C under a nitrogen environment, stirred for 4 hours, then cooled to 55°C, a sodium hydroxide solution with a mass concentration of 30% was added at a constant pressure, the addition time was controlled to be 45 minutes, and the reaction was performed for 5.5 hours after the addition was completed. The product was filtered, and the filtrate was washed with deionized water. After removing the excess epichlorohydrin by vacuum rotary evaporation, the remaining material was cooled and recrystallized by using methanol-free, and vacuum dried to obtain eugenol glycidyl ether; wherein the molar ratio of eugenol, epichlorohydrin and sodium hydroxide was 1:3:2;

[0041] Step 2:

[0042] Dissolve chloroplatinic acid in isopropanol and place it in a dark environment for 28 hours to obtain a chloroplatinic acid-isopropanol solution with a concentration of 0.02 g / mL; disperse eugenol glycidyl ether in anhydrous toluene, heat it to 65°C in a nitrogen environment, add 1,1,3,3-tetramethyldisiloxane, use chloroplatinic acid-isopropanol solution as a catalyst, keep the temperature for reaction for 52 hours, add 4-isopropylaminodiphenylamine, use salicylic acid as a catalyst, and react at 95°C for 9.5 hours; remove impurities by pressure distillation to obtain a silicon-containing diol; wherein the molar ratio of eugenol glycidyl ether, 1,1,3,3-tetramethyldisiloxane, and 4-isopropylaminodiphenylamine is 2:1:2;

[0043] Step 3:

[0044] A silicon-containing diol and polyethylene glycol were mixed in a mass ratio of 1:3 to obtain a mixed diol, and after dehydration at 115° C., isophorone diisocyanate was added to the mixed diol in a molar ratio of hydroxyl group to isocyanate group of 1:1.5, and dibutyltin dilaurate was used as a catalyst, and the mixture was reacted at 75° C. for 2.5 hours to obtain a silicon-containing polyurethane prepolymer;

[0045] Step 4:

[0046] S1: According to weight percentage, 20% of silicon-containing polyurethane prepolymer and 80% of bisphenol A epoxy resin were mixed and stirred for 1.5 hours to obtain a modified epoxy resin;

[0047] S2: 100 kg of cement, 18 kg of silica fume, 120 kg of fine aggregate, 160 kg of coarse aggregate, 5 kg of water reducer, 30 kg of fly ash, 10 kg of modified epoxy resin, 3 kg of curing agent, 2 kg of diluent, and 23 kg of water were mixed and stirred to obtain epoxy resin concrete slurry;

[0048] S3: After pouring the epoxy resin concrete slurry, vibration pressure molding is carried out under a vacuum degree of 0.4MPa, the pressure is 145KN, the time is 90s, the vibration force is 125KN, and the vibration frequency is 160 times / second; after sealing for 24h, demoulding is carried out, and curing is carried out for 28 days at 25°C and relative humidity greater than 95% to obtain epoxy resin concrete for rainwater wells.

[0049] Embodiment 3: An epoxy resin concrete for a rainwater well and a preparation process thereof, comprising the following steps:

[0050] Step 1:

[0051] Eugenol was added to epichlorohydrin, benzyltriethylammonium chloride was used as a catalyst, the temperature was raised to 105°C under a nitrogen environment, stirred for 5 hours, then cooled to 60°C, a sodium hydroxide solution with a mass concentration of 30% was added at a constant pressure, the addition time was controlled to be 60 minutes, and the reaction was carried out for 6 hours after the addition was completed, the product was filtered, the filtrate was washed with deionized water, the excess epichlorohydrin was removed by vacuum rotary evaporation, the remaining material was cooled and recrystallized by methanol-free, and vacuum dried to obtain eugenol glycidyl ether; wherein the molar ratio of eugenol, epichlorohydrin and sodium hydroxide was 1:3:2;

[0052] Step 2:

[0053] Dissolve chloroplatinic acid in isopropanol and place it in a dark environment for 30 hours to obtain a chloroplatinic acid-isopropanol solution with a concentration of 0.02 g / mL; disperse eugenol glycidyl ether in anhydrous toluene, heat it to 70°C in a nitrogen environment, add 1,1,3,3-tetramethyldisiloxane, use chloroplatinic acid-isopropanol solution as a catalyst, keep the temperature for reaction for 56 hours, add 4-isopropylaminodiphenylamine, use salicylic acid as a catalyst, and react at 100°C for 10 hours; remove impurities by pressure distillation to obtain a silicon-containing diol; wherein the molar ratio of eugenol glycidyl ether, 1,1,3,3-tetramethyldisiloxane, and 4-isopropylaminodiphenylamine is 2:1:2;

[0054] Step 3:

[0055] A silicon-containing diol and polyethylene glycol are mixed in a mass ratio of 1:3 to obtain a mixed diol, and after dehydration at 120° C., isophorone diisocyanate is added to the mixed diol in a molar ratio of hydroxyl group to isocyanate group of 1:1.5, and dibutyltin dilaurate is used as a catalyst, and the mixture is reacted at 80° C. for 3 hours to obtain a silicon-containing polyurethane prepolymer;

[0056] Step 4:

[0057] S1: According to weight percentage, 20% of silicon-containing polyurethane prepolymer and 80% of bisphenol A epoxy resin are mixed and stirred for 1 to 2 hours to obtain a modified epoxy resin;

[0058] S2: 100 kg of cement, 18 kg of silica fume, 120 kg of fine aggregate, 160 kg of coarse aggregate, 5 kg of water reducer, 30 kg of fly ash, 12 kg of modified epoxy resin, 3 kg of curing agent, 2 kg of diluent, and 23 kg of water were mixed and stirred to obtain epoxy resin concrete slurry;

[0059] S3: After pouring the epoxy resin concrete slurry, vibration pressure molding is carried out under a vacuum degree of 0.5MPa, the pressure is 150KN, the time is 100s, the vibration force is 130KN, and the vibration frequency is 180 times / second; after sealing for 24h, demoulding is carried out, and curing is carried out for 28 days at 25°C and relative humidity greater than 95% to obtain epoxy resin concrete for rainwater wells.

[0060] Comparative Example 1: The epoxy resin is not modified by using the silicon-containing polyurethane prepolymer, and the other parameters are the same as those in Example 1.

[0061] S1: 100 kg cement, 18 kg silica fume, 120 kg fine aggregate, 160 kg coarse aggregate, 5 kg water reducer, 30 kg fly ash, 8 kg epoxy resin, 3 kg curing agent, 2 kg diluent, and 23 kg water were mixed and stirred to obtain epoxy resin concrete slurry;

[0062] S2: After pouring the epoxy resin concrete slurry, vibration pressure molding is carried out under a vacuum degree of 0.3MPa, the pressure is 150KN, the time is 100s, the vibration force is 120KN, and the vibration frequency is 150 times / second; after sealing for 24h, demoulding is carried out, and curing is carried out for 28 days at 25°C and relative humidity greater than 95% to obtain epoxy resin concrete for rainwater wells.

[0063] Comparative Example 2: The polyurethane prepolymer was prepared without adding silicon-containing diol, and the other parameters were the same as those in Example 2.

[0064] Step 1:

[0065] After dehydrating polyethylene glycol at 115° C., isophorone diisocyanate was added to the polyethylene glycol at a molar ratio of hydroxyl group to isocyanate group of 1:1.5, and dibutyltin dilaurate was used as a catalyst. The reaction was carried out at 75° C. for 2.5 hours to obtain a polyurethane prepolymer;

[0066] Step 2:

[0067] S1: According to weight percentage, 20% polyurethane prepolymer and 80% bisphenol A epoxy resin were mixed and stirred for 1.5 hours to obtain a modified epoxy resin;

[0068] S2: 100 kg of cement, 18 kg of silica fume, 120 kg of fine aggregate, 160 kg of coarse aggregate, 5 kg of water reducer, 30 kg of fly ash, 10 kg of modified epoxy resin, 3 kg of curing agent, 2 kg of diluent, and 23 kg of water were mixed and stirred to obtain epoxy resin concrete slurry;

[0069] S3: After pouring the epoxy resin concrete slurry, vibration pressure molding is carried out under a vacuum degree of 0.4MPa, the pressure is 145KN, the time is 90s, the vibration force is 125KN, and the vibration frequency is 160 times / second; after sealing for 24h, demoulding is carried out, and curing is carried out for 28 days at 25°C and relative humidity greater than 95% to obtain epoxy resin concrete for rainwater wells.

[0070] Comparative Example 3: The amount of the silicon-containing polyurethane prepolymer was increased, and the other parameters were the same as those in Example 3.

[0071] Step 1:

[0072] Eugenol was added to epichlorohydrin, benzyltriethylammonium chloride was used as a catalyst, the temperature was raised to 105°C under a nitrogen environment, stirred for 5 hours, then cooled to 60°C, a sodium hydroxide solution with a mass concentration of 30% was added at a constant pressure, the addition time was controlled to be 60 minutes, and the reaction was carried out for 6 hours after the addition was completed, the product was filtered, the filtrate was washed with deionized water, the excess epichlorohydrin was removed by vacuum rotary evaporation, the remaining material was cooled and recrystallized by methanol-free, and vacuum dried to obtain eugenol glycidyl ether; wherein the molar ratio of eugenol, epichlorohydrin and sodium hydroxide was 1:3:2;

[0073] Step 2:

[0074] Dissolve chloroplatinic acid in isopropanol and place it in a dark environment for 30 hours to obtain a chloroplatinic acid-isopropanol solution with a concentration of 0.02 g / mL; disperse eugenol glycidyl ether in anhydrous toluene, heat it to 70°C in a nitrogen environment, add 1,1,3,3-tetramethyldisiloxane, use chloroplatinic acid-isopropanol solution as a catalyst, keep the temperature for reaction for 56 hours, add 4-isopropylaminodiphenylamine, use salicylic acid as a catalyst, and react at 100°C for 10 hours; remove impurities by pressure distillation to obtain a silicon-containing diol; wherein the molar ratio of eugenol glycidyl ether, 1,1,3,3-tetramethyldisiloxane, and 4-isopropylaminodiphenylamine is 2:1:2;

[0075] Step 3:

[0076] A silicon-containing diol and polyethylene glycol are mixed in a mass ratio of 1:3 to obtain a mixed diol, and after dehydration at 120° C., isophorone diisocyanate is added to the mixed diol in a molar ratio of hydroxyl group to isocyanate group of 1:1.5, and dibutyltin dilaurate is used as a catalyst, and the mixture is reacted at 80° C. for 3 hours to obtain a silicon-containing polyurethane prepolymer;

[0077] Step 4:

[0078] S1: According to weight percentage, 30% of silicon-containing polyurethane prepolymer and 70% of bisphenol A epoxy resin are mixed and stirred for 1 to 2 hours to obtain a modified epoxy resin;

[0079] S2: 100 kg of cement, 18 kg of silica fume, 120 kg of fine aggregate, 160 kg of coarse aggregate, 5 kg of water reducer, 30 kg of fly ash, 12 kg of modified epoxy resin, 3 kg of curing agent, 2 kg of diluent, and 23 kg of water were mixed and stirred to obtain epoxy resin concrete slurry;

[0080] S3: After pouring the epoxy resin concrete slurry, vibration pressure molding is carried out under a vacuum degree of 0.5MPa, the pressure is 150KN, the time is 100s, the vibration force is 130KN, and the vibration frequency is 180 times / second; after sealing for 24h, demoulding is carried out, and curing is carried out for 28 days at 25°C and relative humidity greater than 95% to obtain epoxy resin concrete for rainwater wells.

[0081] Experiment: Samples of 150 mm × 150 mm × 150 mm were prepared according to the methods in Examples 1 to 3 and Comparative Examples 1 to 3, and the compressive strength and flexural strength of the samples were tested; the samples were intermittently aged, and 8 ultraviolet lamps with a rated power of 12 W were set in a constant temperature and humidity test box with a relative humidity of 85% and a temperature of 55°C. The samples were placed in the test box for aging for 12 hours, and then the relative humidity in the sample box was adjusted to 60%, the temperature was 25°C, and the ultraviolet lamp was turned off for 12 hours. Every 24 hours was a cycle, and the compressive strength and flexural strength of the samples were tested after 30 cycles; the test method for compressive strength and flexural strength refers to GB / T 50081-2019 "Standard for Test Methods for Physical and Mechanical Properties of Concrete".

[0082]

[0083] Conclusion: The data of Examples 1 to 3 and Comparative Examples 1 to 3 show that the epoxy resin concrete for rainwater wells prepared by the present invention has good mechanical properties and exhibits excellent anti-aging effects after cyclic aging experiments. The data of Example 1 and Comparative Example 1 show that after adding the silicon-containing polyurethane prepolymer, the compressive strength and flexural strength of the material are improved, and it exhibits more excellent aging resistance. The data of Example 2 and Comparative Example 2 show that the addition of silicon-containing diols effectively improves the toughness and anti-aging properties of the material. The data of Example 3 and Comparative Example 3 show that the addition of too much polyurethane prepolymer will affect the modification effect of epoxy resin on concrete.

[0084] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A preparation process of epoxy resin concrete for rainwater wells, characterized in that: The following steps are involved: S1: Mix cement, silica fume, fine aggregate, coarse aggregate, water reducing agent, fly ash, modified epoxy resin, curing agent, diluent and water, and stir to obtain epoxy resin concrete slurry; S2: After pouring the epoxy resin concrete slurry, vibrating and pressurizing the slurry; sealing the slurry for 24 hours, demolding the slurry, and curing the slurry for 28 days to obtain epoxy resin concrete for rainwater wells; The preparation process of the modified epoxy resin comprises the following steps: Step 1: Add eugenol to epichlorohydrin, use benzyltriethylammonium chloride as a catalyst, heat to 100-105°C under a nitrogen environment, stir for 3-5 hours, cool to 50-60°C, add a sodium hydroxide solution with a mass concentration of 30-40% at a constant pressure, control the addition time to be 30-60 minutes, react for 5-6 hours after the addition, filter the product, wash the filtrate with deionized water, remove excess epichlorohydrin by vacuum rotary evaporation, cool and recrystallize the remaining material with methanol-free, and vacuum dry to obtain eugenol glycidyl ether; Step 2: Dissolve chloroplatinic acid in isopropanol and place it in a dark environment for 24 to 30 hours to obtain a chloroplatinic acid-isopropanol solution with a concentration of 0.02 to 0.03 g / mL; disperse eugenol glycidyl ether in anhydrous toluene, heat it to 60 to 70°C in a nitrogen environment, add 1,1,3,3-tetramethyldisiloxane, use chloroplatinic acid-isopropanol solution as a catalyst, keep the temperature for reaction for 48 to 56 hours, add 4-isopropylaminodiphenylamine, use salicylic acid as a catalyst, and react at 85 to 100°C for 8 to 10 hours; remove impurities by pressure distillation to obtain a silicon-containing diol; Step 3: The silicon-containing diol and polyethylene glycol are mixed to obtain a mixed diol, and after dehydration at 100-120° C., isophorone diisocyanate is added to the mixed diol, and dibutyltin dilaurate is used as a catalyst to react at 70-80° C. for 2-3 hours to obtain a silicon-containing polyurethane prepolymer; Step 4: The silicon-containing polyurethane prepolymer and bisphenol A epoxy resin are mixed and stirred for 1 to 2 hours to obtain a modified epoxy resin.

2. The preparation process of epoxy resin concrete for rainwater well according to claim 1, characterized in that: In S1, the amount of each component in the epoxy resin concrete slurry, by weight, is 100 parts of cement, 5-20 parts of silica fume, 120-140 parts of fine aggregate, 150-160 parts of coarse aggregate, 3-5 parts of water reducer, 20-35 parts of fly ash, 8-12 parts of modified epoxy resin, 2-3 parts of curing agent, 1-2 parts of diluent, and 20-25 parts of water.

3. The preparation process of epoxy resin concrete for rainwater well according to claim 1, characterized in that: In step 1, the molar ratio of eugenol, epichlorohydrin and sodium hydroxide is 1:(3-4.5):(2-3).

4. The preparation process of epoxy resin concrete for rainwater well according to claim 1, characterized in that: In step 2, the molar ratio of eugenol glycidyl ether, 1,1,3,3-tetramethyldisiloxane and 4-isopropylaminodiphenylamine is 2:1:

2.

5. The preparation process of epoxy resin concrete for rainwater well according to claim 1, characterized in that: In step 3, the silicon-containing diol and the polyethylene glycol are mixed in a mass ratio of 1:(3-5) to obtain a mixed diol; and isophorone diisocyanate is added to the mixed diol in a molar ratio of hydroxyl group to isocyanate group of 1:(1.5-1.8).

6. The preparation process of epoxy resin concrete for rainwater well according to claim 1, characterized in that: In step 4, the contents of the components in the modified epoxy resin are, by weight percentage, 12-20% of the silicon-containing polyurethane prepolymer and 80-88% of the bisphenol A epoxy resin.

7. The preparation process of epoxy resin concrete for rainwater well according to claim 1, characterized in that: The vibration pressure molding method is: under a vacuum degree of 0.3~0.5MPa, the pressure is 140~150KN, the time is 75~100s, the vibration force is 120~130KN, and the vibration frequency is 150~180 times / second.

8. The preparation process of epoxy resin concrete for rainwater well according to claim 1, characterized in that: The curing temperature is 25~30℃ and the relative humidity is greater than 95%.

9. The epoxy resin concrete for rainwater wells prepared by the preparation process according to any one of claims 1 to 8.

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