Waterproof material for house building construction

Abstract

The invention relates to a waterproof material for house building construction, and belongs to the technical field of waterproof materials, the waterproof material for house building construction comprises the following components by weight: 30-40 parts of Portland cement, 42-50 parts of fine river sand, 2-6 parts of a microbial admixture, 1.8-2.4 parts of nutritive salt, 0.4-1.2 parts of reinforced fiber, 0.3-0.5 part of a water reducer, 0.05-0.15 part of an antifoaming agent, and 15-20 parts of water. The microbial additive comprises a bacterial liquid, zeolite and phosphate type epoxy resin. The bacterial liquid is adsorbed in pores of the zeolite, and phosphate type epoxy resin is coated on the surface of the zeolite loaded with the bacterial liquid. According to the technical scheme, the shrinkage effect of the cement-based waterproof material can be compensated by adding the microbial admixture into the waterproof material, and meanwhile, the self-repairing waterproof effect can be achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of waterproof materials, and in particular, relates to a waterproof material for building construction. Background Art

[0002] Waterproof materials are key media for waterproof and anti-seepage performance of building structures. They are widely used in large-scale construction projects, pipeline corridor projects, tunnel projects, petroleum and petrochemical projects, and environmental protection projects. As an inorganic environmentally friendly waterproof material, cement-based waterproof coatings have gradually become the main material for various types of concrete structure waterproofing projects. However, during the cement hydration process, a large number of pores are inevitably formed inside the cement-based waterproof material. In actual applications, there are disadvantages such as large shrinkage, easy cracking, and poor durability, which lead to leakage in the cement-based waterproof material, making it difficult to repair it later and the effect is not good. Therefore, it is of great significance and importance to provide a waterproof material that can achieve self-healing function. Summary of the invention

[0003] The purpose of the present invention is to provide a waterproof material for house construction, wherein the bacterial liquid is adsorbed in the pores of zeolite, and then a phosphate-type epoxy resin is coated on the surface of the zeolite to obtain a microbial admixture. Adding the microbial admixture to the waterproof material can compensate for the shrinkage effect of the cement-based waterproof material and achieve a self-repairing waterproof effect.

[0004] The technical problem to be solved by the present invention is as follows: During the cement hydration process, a large number of pores are inevitably formed inside the cement-based waterproof material. In actual applications, there are disadvantages such as large shrinkage, easy cracking, and poor durability, which leads to leakage of the cement-based waterproof material, making subsequent repair difficult and ineffective.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A waterproof material for house construction comprises the following components in parts by weight: 30-40 parts of silicate cement, 42-50 parts of fine river sand, 2-6 parts of microbial admixture, 1.8-2.4 parts of nutrient salt, 0.4-1.2 parts of reinforcing fiber, 0.3-0.5 parts of water reducing agent, 0.05-0.15 parts of defoaming agent and 15-20 parts of water.

[0007] Furthermore, the preparation method of the microbial admixture comprises the following steps:

[0008] A1. Inoculate Bacillus pasteurianus into a liquid culture medium, and culture with shaking at 27-32° C. for 24-48 hours to obtain a bacterial solution;

[0009] Furthermore, in step A1, the concentration of the bacterial solution is 10 9 -10 10 cells / mL.

[0010] Furthermore, in step A1, the liquid culture medium is: 3-6 g / L peptone, 2-5 g / L beef extract, and sodium hydroxide is used to adjust the solution pH to 8-10.

[0011] A2, placing the zeolite into the bacterial solution prepared in step A1 and vacuum impregnating for 12-18 hours, and drying to obtain the zeolite loaded with the bacterial solution;

[0012] Furthermore, in step A2, the mass ratio of the bacterial liquid to the zeolite is 1:5-9.

[0013] Furthermore, in step A2, the particle size of the zeolite is 1-4 mm.

[0014] A3, hydrogenated bisphenol A and epichlorohydrin are placed in a mixed solution of ethylene glycol and deionized water and stirred evenly, then sodium hydroxide is added, stirred at 65-75° C. for 6-8 hours, then monoethyl phosphate and an esterification catalyst are added, stirred and reacted at 80-85° C. for 12-18 hours, and after the reaction is completed, ethyl acetate is added for static extraction, the organic phase is collected, and then the ethyl acetate is removed by rotary evaporation and vacuum filtration to obtain a phosphate-type epoxy resin;

[0015] Furthermore, in step A3, the usage ratio of hydrogenated bisphenol A, epichlorohydrin, ethylene glycol, deionized water, sodium hydroxide, monoethyl phosphate and esterification catalyst is (2.1-2.5) g: (3.2-3.4) g: (60-70) mL: (82-90) mL: (0.9-1.3) g: (1-1.4) g: (0.05-0.09) g.

[0016] Furthermore, in step A3, the esterification catalyst is dicyclohexylcarbodiimide.

[0017] A4. Add phosphate epoxy resin into deionized water, stir evenly, and then spray it on the surface of zeolite loaded with bacterial solution, and dry it to obtain a microbial admixture.

[0018] Furthermore, in step A4, the usage ratio of the phosphate ester epoxy resin and deionized water is 1 g: (5-10) mL.

[0019] In the above preparation process, the bacterial solution is adsorbed in the pores of the zeolite by vacuum impregnation technology, and then the phosphate type epoxy resin is coated on the surface of the zeolite loaded with the bacterial solution to obtain a microbial admixture. The microbial admixture uses zeolite as a carrier to protect Bacillus pasteurianus, and the phosphate type epoxy resin located in the outer layer can further protect Bacillus pasteurianus to prevent the alkaline environment in the concrete matrix from affecting the survival of Bacillus pasteurianus.

[0020] The present invention grafts phosphate onto the epoxy resin molecular chain. On the one hand, the phosphate is used to improve the water solubility of the epoxy resin. When tiny cracks appear in the waterproof material, water will flow into the cracks. When the microbial admixture prepared by the present invention encounters water, its outer layer can be broken faster, and the microorganisms in the zeolite pores multiply quickly to induce mineralization and deposition, quickly fill the cracks, reduce the generation of tiny cracks, and further improve the compressive strength and waterproof performance of the waterproof material. On the other hand, the phosphate groups on the phosphate-type epoxy resin will gradually hydrolyze in a strong alkaline environment to release free phosphate ions. The phosphate ions can react with cement hydration products to form a dense and insoluble phosphate thin layer, thereby improving the waterproof ability of the waterproof material.

[0021] Furthermore, the fineness modulus of fine river sand is 1.8-2.3.

[0022] Furthermore, the reinforcing fiber is at least one of polypropylene fiber, carbon fiber and basalt fiber.

[0023] Furthermore, the average length of the reinforcing fibers is 1-8 mm.

[0024] Furthermore, the water reducing agent is a polyether polycarboxylic acid water reducing agent.

[0025] Furthermore, the defoaming agent is a silicone defoaming agent.

[0026] Furthermore, the nutrient salt is a mixture of urea and calcium nitrate; the mass ratio of urea to calcium nitrate is 1:(1.5-2).

[0027] Beneficial effects of the present invention:

[0028] (1) In the technical solution of the present invention, adding microbial admixtures to cement-based waterproof materials can achieve a self-repairing waterproof effect, and the addition of reinforcing fibers improves the compressive strength of the waterproof material.

[0029] (2) In the technical solution of the present invention, the bacterial solution is adsorbed into the pores of the zeolite by vacuum impregnation technology, and then the phosphate-type epoxy resin is coated on the surface of the zeolite loaded with the bacterial solution to prepare a microbial admixture. The microbial admixture uses zeolite as a carrier to protect Bacillus pasteurianus, and the phosphate-type epoxy resin located in the outer layer can further protect Bacillus pasteurianus and prevent the alkaline environment in the concrete matrix from affecting the survival of Bacillus pasteurianus.

[0030] (3) In the technical scheme of the present invention, phosphate is grafted onto the epoxy resin molecular chain. On the one hand, phosphate can be used to improve the water solubility of epoxy resin. When tiny cracks appear in the waterproof material, water will flow into the cracks. When the microbial admixture prepared by the present invention encounters water, its outer layer can rupture faster, and the microorganisms located in the pores of the zeolite multiply rapidly to induce mineralization and deposition, quickly fill the cracks, reduce the generation of tiny cracks, and thus improve the compressive strength and waterproof performance of the waterproof material; on the other hand, the phosphate groups on the phosphate-type epoxy resin will gradually hydrolyze in a strong alkaline environment to release free phosphate ions. The phosphate ions can react with cement hydration products to form a dense and insoluble phosphate thin layer, thereby improving the waterproof ability of the waterproof material. DETAILED DESCRIPTION

[0031] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0032] Example 1

[0033] This embodiment provides a method for preparing a microbial admixture, comprising the following steps:

[0034] A1. Put 3g of peptone and 2g of beef extract into 1L of deionized water, and adjust the pH of the solution to 8 with sodium hydroxide to prepare a liquid culture medium; inoculate Bacillus pasteurianus into the liquid culture medium, and shake and culture at 27°C and 150rpm for 24h to obtain a concentration of 2×10 9 cells / mL of bacterial solution;

[0035] A2. In a nitrogen atmosphere, 100 g of zeolite with an average particle size of 1.5 mm was placed into 20 g of the bacterial solution prepared in step A1 and vacuum impregnated for 12 h, and then dried at 35° C. to constant weight to obtain zeolite loaded with bacterial solution;

[0036] A3, 21g hydrogenated bisphenol A and 32g epichlorohydrin were placed in a mixed solution of 600mL ethylene glycol and 820mL deionized water and stirred evenly, then 9g sodium hydroxide was added, stirred at 65°C for 6h, then 10g monoethyl phosphate and 0.5g dicyclohexylcarbodiimide were added, stirred and reacted at 80°C for 12h, ethyl acetate was added after the reaction was completed, and the organic phase was collected, and then the ethyl acetate was removed by rotary evaporation and vacuum filtration to obtain a phosphate type epoxy resin;

[0037] A4. Add 20 g of phosphate epoxy resin into 100 mL of deionized water, stir evenly, and spray on the surface of the zeolite loaded with the bacterial solution, and dry at 35° C. to constant weight to obtain a microbial admixture.

[0038] Example 2

[0039] This embodiment provides a method for preparing a microbial admixture, comprising the following steps:

[0040] A1. Put 4 g of peptone and 3 g of beef extract into 1 L of deionized water, and adjust the pH of the solution to 9.2 with sodium hydroxide to prepare a liquid culture medium; inoculate Bacillus pasteurianus into the liquid culture medium, and shake and culture at 30°C and 150 rpm for 36 h to obtain a concentration of 5×10 9 cells / mL of bacterial solution;

[0041] A2, placing 130 g of zeolite with an average particle size of 3.2 mm into 20 g of the bacterial solution prepared in step A1, vacuum impregnating for 15 h, and drying at 40° C. to constant weight to obtain zeolite loaded with bacterial solution;

[0042] A3. In a nitrogen atmosphere, 23 g of hydrogenated bisphenol A and 33 g of epichlorohydrin were placed in a mixed solution of 650 mL of ethylene glycol and 860 mL of deionized water and stirred evenly, followed by adding 11 g of sodium hydroxide, stirring at 70 ° C for 7 h, then adding 12 g of monoethyl phosphate and 0.7 g of dicyclohexylcarbodiimide, stirring and reacting at 80 ° C for 16 h, adding ethyl acetate after the reaction was completed, standing and extracting, collecting the organic phase, and then removing the ethyl acetate by rotary evaporation and vacuum filtration to obtain a phosphate-type epoxy resin;

[0043] A4. Add 20 g of phosphate epoxy resin into 150 mL of deionized water, stir evenly and spray on the surface of the zeolite loaded with the bacterial solution, and dry at 40° C. to constant weight to obtain a microbial admixture.

[0044] Example 3

[0045] This embodiment provides a method for preparing a microbial admixture, comprising the following steps:

[0046] A1. Put 6 g of peptone and 5 g of beef extract into 1 L of deionized water, and adjust the pH of the solution to 10 with sodium hydroxide to prepare a liquid culture medium; inoculate Bacillus pasteurianus into the liquid culture medium, and shake and culture at 32°C and 150 rpm for 48 h to obtain a liquid culture medium with a concentration of 10 10 cells / mL of bacterial solution;

[0047] A2, placing 180 g of zeolite with an average particle size of 3.8 mm into 20 g of the bacterial solution prepared in step A1, vacuum impregnating for 18 h, and drying at 40° C. to constant weight to obtain zeolite loaded with bacterial solution;

[0048] A3. In a nitrogen atmosphere, 25 g of hydrogenated bisphenol A and 34 g of epichlorohydrin were placed in a mixed solution of 700 mL of ethylene glycol and 900 mL of deionized water and stirred evenly, followed by adding 13 g of sodium hydroxide and stirring at 75 ° C for 8 h, then adding 14 g of monoethyl phosphate and 0.9 g of dicyclohexylcarbodiimide, stirring and reacting at 85 ° C for 18 h, adding ethyl acetate after the reaction was completed, standing and extracting, collecting the organic phase, and then removing the ethyl acetate by rotary evaporation and vacuum filtration to obtain a phosphate-type epoxy resin;

[0049] A4. Add 20 g of phosphate-type epoxy resin into 200 mL of deionized water, stir evenly, and spray on the surface of the zeolite loaded with the bacterial solution, and dry at 42° C. to constant weight to obtain a microbial admixture.

[0050] Example 4

[0051] A waterproof material for house construction comprises the following components in parts by weight: 30 parts of silicate cement, 42 parts of fine river sand, 2 parts of the microbial admixture prepared in Example 1, 0.7 parts of urea, 1.1 parts of calcium nitrate, 0.4 parts of polypropylene fiber, 0.3 parts of polyether polycarboxylic acid water reducer PC-2, 0.05 parts of dimethyl silicone oil, and 15 parts of water.

[0052] The silicate cement is P·O 42.5 type ordinary silicate cement, the fineness modulus of the fine river sand is 1.8, and the average length of the polypropylene fiber is 1 mm.

[0053] Example 5

[0054] A waterproof material for house construction comprises the following components in parts by weight: 32 parts of silicate cement, 45 parts of fine river sand, 3 parts of the microbial admixture prepared in Example 2, 0.8 parts of urea, 1.2 parts of calcium nitrate, 0.7 parts of polypropylene fiber, 0.35 parts of polyether polycarboxylic acid water reducer PC-2, 0.08 parts of dimethyl silicone oil, and 15 parts of water.

[0055] The silicate cement is P·O 42.5 type ordinary silicate cement, the fineness modulus of the fine river sand is 1.9, and the average length of the polypropylene fiber is 2.5 mm.

[0056] Example 6

[0057] A waterproof material for house construction comprises the following components in parts by weight: 35 parts of silicate cement, 46 parts of fine river sand, 5 parts of the microbial admixture prepared in Example 2, 0.8 parts of urea, 1.3 parts of calcium nitrate, 0.7 parts of basalt fiber, 0.4 parts of polyether polycarboxylate water reducer PC-2, 0.1 parts of dimethyl silicone oil, and 15 parts of water.

[0058] The silicate cement is P·O 42.5 type ordinary silicate cement, the fineness modulus of the fine river sand is 2, and the average length of the polypropylene fiber is 4.3 mm.

[0059] Example 7

[0060] A waterproof material for house construction comprises the following components in parts by weight: 38 parts of silicate cement, 50 parts of fine river sand, 5 parts of the microbial admixture prepared in Example 3, 0.82 parts of urea, 1.18 parts of calcium nitrate, 1 part of carbon fiber, 0.42 parts of polyether polycarboxylic acid water reducer PC-2, 0.11 parts of dimethyl silicone oil, and 16 parts of water.

[0061] The silicate cement is P·O 42.5 type ordinary silicate cement, the fineness modulus of the fine river sand is 2.1, and the average length of the polypropylene fiber is 3.6 mm.

[0062] Example 8

[0063] A waterproof material for house construction comprises the following components in parts by weight: 40 parts of silicate cement, 44 parts of fine river sand, 6 parts of the microbial admixture prepared in Example 3, 0.8 parts of urea and 1.6 parts of calcium nitrate, 1.1 parts of basalt fiber, 0.48 parts of polyether polycarboxylic acid water reducer PC-2, 0.12 parts of dimethyl silicone oil, and 17 parts of water.

[0064] The silicate cement is P·O 42.5 type ordinary silicate cement, the fineness modulus of the fine river sand is 2.3, and the average length of the polypropylene fiber is 6.5 mm.

[0065] Example 9

[0066] A waterproof material for house construction comprises the following components in parts by weight: 40 parts of silicate cement, 50 parts of fine river sand, 6 parts of the microbial admixture prepared in Example 1, 0.85 parts of urea, 1.55 parts of calcium nitrate, 1.2 parts of polypropylene fiber, 0.5 parts of polyether polycarboxylic acid water reducer PC-2, 0.15 parts of dimethyl silicone oil, and 20 parts of water.

[0067] The silicate cement is P·O 42.5 type ordinary silicate cement, the fineness modulus of the fine river sand is 2.2, and the average length of the polypropylene fiber is 7.3 mm.

[0068] Comparative Example 1

[0069] Compared with Example 6, the microbial admixture in Comparative Example 1 does not have a phosphate-type epoxy resin layer, and the other steps and raw materials are the same as those in Example 6.

[0070] Comparative Example 2

[0071] Compared with Example 6, the phosphate-type epoxy resin coating the outer layer of the microbial admixture in Comparative Example 2 was replaced with epoxy resin, and the other steps and raw materials were the same as those in Example 6.

[0072] Comparative Example 3

[0073] Compared with Example 6, in Comparative Example 3, the microbial admixture is a microbial bacterial solution, zeolite is not used for adsorption, and phosphate-type epoxy resin is not coated. Other steps and raw materials are the same as those in Example 6.

[0074] Performance Testing

[0075] The raw materials of Examples 4-9 and Comparative Examples 1-3 were mixed according to weight proportions to prepare standard cubic test blocks with a side length of 100 mm, and cured for 28 days under standard conditions. A universal testing machine was used to perform a mechanical property test to determine the compressive strength of the concrete after 28 days of curing; and an anti-permeability test was performed according to JGJ / T70-2009 "Standard for Test Methods for Basic Properties of Building Mortar";

[0076] Table 1

[0077] project Compressive strength / MPa Impermeability pressure / MPa Example 4 78.0 2.8 Example 5 79.6 3.1 Example 6 83.2 3.4 Example 7 80.5 3.2 Example 8 81.7 2.9 Example 9 82.4 3.0 Comparative Example 1 60.8 1.6 Comparative Example 2 69.7 2.1 Comparative Example 3 48.2 0.9

[0078] As can be seen from the data in Table 1, the waterproof material provided by the present invention has excellent compressive strength and waterproof performance. It can be seen from the data of Comparative Example 6 and Comparative Example 1 that since the surface of the zeolite loaded with the bacterial solution is not coated with a phosphate-based epoxy resin, the activity of the bacterial solution is greatly affected by the alkalinity of the concrete, and there is no phosphate group, resulting in a decrease in the anti-seepage performance of the waterproof material. It can be seen from the data of Comparative Example 6 and Comparative Example 2 that the presence of the phosphate group helps to improve the anti-seepage pressure and compressive strength of the waterproof material. It can be seen from the data of Comparative Example 6 and Comparative Example 3 that the microbial bacterial solution is directly dispersed in the concrete matrix, the microorganisms are not protected, and the absence of zeolite causes the bacterial solution to be unevenly dispersed in the matrix, thereby causing the anti-seepage pressure and compressive strength of the waterproof material to be significantly reduced.

[0079] In the description of the specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0080] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the invention or exceed the scope defined by the claims, they shall all fall within the protection scope of the present invention.

Claims

1. A waterproof material for housing construction, characterized in that: The invention comprises the following components in parts by weight: 30-40 parts of silicate cement, 42-50 parts of fine river sand, 2-6 parts of microbial admixture, 1.8-2.4 parts of nutrient salt, 0.4-1.2 parts of reinforcing fiber, 0.3-0.5 parts of water reducing agent, 0.05-0.15 parts of defoaming agent, and 15-20 parts of water; The preparation method of the microbial admixture comprises the following steps: A1. Inoculate Bacillus pasteurianus into a liquid culture medium, and culture with shaking at 27-32° C. for 24-48 hours to obtain a bacterial solution; A2, placing the zeolite into the bacterial solution prepared in step A1 and vacuum impregnating for 12-18 hours, and drying to obtain the zeolite loaded with the bacterial solution; A3, hydrogenated bisphenol A and epichlorohydrin are placed in a mixed solution of ethylene glycol and deionized water and stirred evenly, then sodium hydroxide is added, stirred at 65-75° C. for 6-8 hours, then monoethyl phosphate and an esterification catalyst are added, stirred and reacted at 80-85° C. for 12-18 hours, and after the reaction is completed, ethyl acetate is added for static extraction, the organic phase is collected, and then the ethyl acetate is removed by rotary evaporation and vacuum filtration to obtain a phosphate-type epoxy resin; A4. Add phosphate epoxy resin into deionized water, stir evenly, and then spray it on the surface of zeolite loaded with bacterial solution, and dry it to obtain a microbial admixture.

2. A waterproof material for building construction according to claim 1, characterized in that: In step A1, the concentration of the bacterial solution is 10 9 -10 10 cells / mL.

3. A waterproof material for building construction according to claim 1, characterized in that: In step A1, the liquid culture medium contains: 3-6 g / L peptone, 2-5 g / L beef extract, and sodium hydroxide is used to adjust the solution pH to 8-10.

4. A waterproof material for building construction according to claim 1, characterized in that: In the step A2, the mass ratio of the bacterial liquid to the zeolite is 1:5-9.

5. The waterproof material for building construction according to claim 1, characterized in that: In the step A2, the particle size of the zeolite is 1-4 mm.

6. A waterproof material for building construction according to claim 1, characterized in that: In the step A3, the usage ratio of hydrogenated bisphenol A, epichlorohydrin, ethylene glycol, deionized water, sodium hydroxide, monoethyl phosphate and esterification catalyst is (2.1-2.5) g: (3.2-3.4) g: (60-70) mL: (82-90) mL: (0.9-1.3) g: (1-1.4) g: (0.05-0.09) g.

7. A waterproof material for building construction according to claim 1, characterized in that: In the step A3, the esterification catalyst is dicyclohexylcarbodiimide.

8. The waterproof material for building construction according to claim 1, characterized in that: In the step A4, the usage ratio of the phosphate ester epoxy resin to deionized water is 1 g: (5-10) mL.

9. The waterproof material for building construction according to claim 1, characterized in that: The reinforcing fiber is at least one of polypropylene fiber, carbon fiber and basalt fiber.

10. The waterproof material for building construction according to claim 1, characterized in that: The nutrient salt is a mixture of urea and calcium nitrate; the mass ratio of the urea to calcium nitrate is 1:(1.5-2).