CN108892414B - Multifunctional anti-cracking waterproof agent for expanded fibers and preparation method thereof - Google Patents
Multifunctional anti-cracking waterproof agent for expanded fibers and preparation method thereof Download PDFInfo
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- CN108892414B CN108892414B CN201810818799.3A CN201810818799A CN108892414B CN 108892414 B CN108892414 B CN 108892414B CN 201810818799 A CN201810818799 A CN 201810818799A CN 108892414 B CN108892414 B CN 108892414B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/46—Rock wool ; Ceramic or silicate fibres
- C04B14/4643—Silicates other than zircon
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/04—Macromolecular compounds
- C04B16/06—Macromolecular compounds fibrous
- C04B16/0616—Macromolecular compounds fibrous from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B16/0625—Polyalkenes, e.g. polyethylene
- C04B16/0633—Polypropylene
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/60—Agents for protection against chemical, physical or biological attack
- C04B2103/65—Water proofers or repellants
Abstract
The invention discloses a multifunctional anti-cracking waterproof agent for expanded fibers, which comprises 8-27.3 parts by weight of calcium sulphoaluminate, 4-9 parts by weight of calcium oxide, 5-9 parts by weight of magnesium oxide, 14.7-23.5 parts by weight of fly ash, 4-9 parts by weight of an iron powder expanding agent, 1.5-7.8 parts by weight of modified sepiolite wool, 1-4.5 parts by weight of modified polypropylene fibers, 1.5-4 parts by weight of sodium methyl silicate, 0.5-1.5 parts by weight of sodium fluosilicate and 1-4 parts by weight of a polycarboxylic acid high-efficiency water reducing agent; compared with the anti-cracking waterproof agent which takes the common sepiolite, the sepiolite fibers and the polypropylene fibers as raw materials, the anti-cracking waterproof agent has better crack resistance and expansibility, shorter setting time and stronger concrete performance. The invention also provides a preparation method of the anti-cracking waterproof agent, which adopts a two-step method to uniformly mix the raw materials.
Description
Technical Field
The invention belongs to the technical field of concrete preparation, and particularly relates to a multifunctional anti-cracking waterproof agent for expanded fibers and a preparation method thereof.
Background
According to statistics, more than 80% of the concrete has cracking phenomena of different degrees at present, harmful substances and water migrate into the concrete through cracks to damage the structure of the concrete, so that the cracks are further enlarged, the strength and the durability of a building are rapidly reduced, and the service life of the building is finally influenced. In order to solve the problem of cracks, an expanding agent or fibers are required to be added in the preparation process of the concrete, and in the added expanding agent, the early shrinkage of the concrete can be compensated by utilizing a calcium sulphoaluminate-calcium oxide compound, and the later shrinkage of the concrete can be compensated by utilizing the calcium sulphoaluminate-calcium oxide compound; in addition, the adsorption of the network structure formed by the polypropylene fibers to concrete aggregate or the grafting characteristic of the modified polypropylene fibers after being treated by the silane coupling agent are utilized to achieve the effects of water resistance and cracking resistance of the concrete finished product.
The density and the component volume weight of the sepiolite are equivalent to those of cement, and the sepiolite has good dispersibility, strong binding force and consistent coefficient of thermal expansion and cold contraction when being mixed with cement concrete; the specific surface area is high (up to 800-900 m/g), the porosity is large, and the adsorption capacity is very strong; the sepiolite wool has good compatibility with other fibers, and meanwhile, the sepiolite wool has extremely high thermal stability and high temperature resistance (which can reach 1500-1700 ℃); has good formability and salinity resistance. These excellent properties make it widely used in the concrete preparation technology field.
The polypropylene fiber is a low-elasticity-modulus fiber with good flexibility, the diameter of the fiber is only 40-50 mu m, and the dispersibility of the fiber in concrete is good. When the concrete is prepared, a certain amount of polypropylene fibers are doped, and are mutually overlapped and drawn in the concrete to form a fiber screen, so that the adsorption force between concrete aggregates is increased, the crack resistance of the concrete can be obviously improved, and the plastic shrinkage cracks are reduced, so that the polypropylene fiber reinforced concrete is increasingly and widely popularized and applied in engineering.
In the prior art, for example, the patent "concrete expanding agent" of patent No. 2014102937502 provides a concrete expanding agent, in which sepiolite wool is added to increase the water resistance, crack resistance and expansion performance of the expanding agent. For example, in the patent "a concrete crack-resistant repairing agent and concrete using the same" of patent No. 201610954306X, sepiolite wool and polypropylene fiber are added to the concrete crack-resistant repairing agent, and the combined action of the sepiolite wool and the polypropylene fiber is utilized to improve the impermeability and crack resistance of the concrete. However, the water resistance, crack resistance and expansion properties of the concrete prepared by the techniques of these 2 patents are still not ideal.
Disclosure of Invention
In order to solve the problems, the invention provides a multifunctional anti-cracking waterproof agent for expanded fibers, which is realized by the following technology.
The multifunctional anti-cracking waterproof agent for the expanded fibers comprises, by weight, 8-27.3 parts of calcium sulphoaluminate, 4-9 parts of calcium oxide, 5-9 parts of magnesium oxide, 14.7-23.5 parts of fly ash, 4-9 parts of an iron powder expanding agent, 1.5-7.8 parts of modified sepiolite wool, 1-4.5 parts of modified polypropylene fibers, 1.5-4 parts of sodium methyl silicate, 0.5-1.5 parts of sodium fluosilicate and 1-4 parts of a polycarboxylic acid high-efficiency water reducing agent;
the preparation method of the modified sepiolite wool comprises the following steps:
a1, adding sepiolite wool into 2mol/L dilute hydrochloric acid according to the solid-to-liquid ratio of 1:15, stirring for 2-6 h, standing for 1-2 d at 40 ℃, performing suction filtration, washing with deionized water, and drying to obtain acid-activated sepiolite wool;
a2, mixing acid activated sepiolite wool, sodium isobutyl naphthalenesulfonate and deionized water according to the weight ratio of 1:0.15:30, and stirring uniformly at 200-500 r/min to obtain acid activated sepiolite wool slurry;
a3, taking a silane coupling agent and absolute ethyl alcohol according to the weight ratio of 1: 15-25, and carrying out water bath for 2h at the temperature of 60 ℃ to obtain silane hydrolysate; and (3) uniformly stirring the acid activated sepiolite wool and the silane hydrolysis liquid according to the weight ratio of 1:10, and drying to obtain the modified sepiolite wool.
The sepiolite fibers are modified by using dilute hydrochloric acid and a silane coupling agent, so that the sepiolite fibers have better dispersibility, and the surface contact area of the modified polypropylene fibers can be increased due to the fact that the modified polypropylene fibers have more anisotropic grafting phenomena on the surface; the modified polypropylene fiber is adsorbed by utilizing the stronger adsorption property of the modified sepiolite wool, and the two fibers are mutually wound. The modified sepiolite wool has good compatibility with concrete, a fiber net structure is formed in the concrete, and the bond strength of the fiber and the concrete is increased; the modified polypropylene fiber can enhance the interface bonding force of cement paste, and the two fibers are simultaneously used as a concrete internal structure supporting system, so that the early-stage crack resistance of the concrete is obviously enhanced when the modified polypropylene fiber is damaged by external force.
The surface of iron powder in the iron powder expanding agent is oxidized to generate iron oxide, when the iron powder is mixed and contacted with concrete, the iron oxide is gradually dissolved, and Fe is continuously enhanced along with the alkalinity in a liquid phase3+And (OH)-Reaction to form gelatinous Fe (OH)3The expansion effect is generated, the colloidal iron compounds can fill cement pores, and can be crystallized and separated out after water is evaporated, so that the concrete is more compact, the strength of the concrete is improved, and the waterproof performance is better.
When cracks are generated, the sodium methylsilicate has the self-healing function and can be used for treating CO2And the action of waterAnd crystallization occurs below the surface of the material to fill up cracks, and meanwhile, methyl in the molecular structure forms a hydrophobic layer on the surface of the material to achieve the double waterproof effect. The product has simple preparation process, easily obtained and low cost, and the raw materials are sold in the market, and meet the requirements of crack resistance and water resistance in the concrete engineering.
Preferably, the high-efficiency water reducing agent comprises, by weight, 12-22 parts of calcium sulphoaluminate, 6.5 parts of calcium oxide, 6.5 parts of magnesium oxide, 18.5 parts of fly ash, 5-7 parts of iron powder expanding agent, 3-6.8 parts of modified sepiolite wool, 1-3.5 parts of modified polypropylene fiber, 3 parts of sodium methyl silicate, 1 part of sodium fluosilicate and 2.5 parts of polycarboxylic acid high-efficiency water reducing agent.
More preferably, the high-efficiency water reducing agent comprises 18 parts by weight of calcium sulphoaluminate, 6.5 parts by weight of calcium oxide, 6.5 parts by weight of magnesium oxide, 18.5 parts by weight of fly ash, 6.5 parts by weight of iron powder expanding agent, 6 parts by weight of modified sepiolite wool, 3 parts by weight of modified polypropylene fiber, 3 parts by weight of sodium methyl silicate, 1 part by weight of sodium fluosilicate and 2.5 parts by weight of polycarboxylic acid high-efficiency water reducing agent.
Preferably, the preparation method of the iron powder expanding agent comprises the following steps:
b1, iron powder gradation: sieving the iron powder by using sieves with the aperture of 0.15mm, 0.3mm, 0.6mm and 1.18mm respectively, and taking the iron powder as undersize products according to the weight ratio of 18-23: 20-25: 23-27: 25-30 and mixing uniformly to obtain mixed iron powder;
b2, preparation of an oxidation catalyst: uniformly mixing potassium dichromate and potassium manganate according to the weight ratio of 2:1 to obtain a mixed oxidant; uniformly mixing ammonium chloride and sodium chloride according to the weight ratio of 2:3 to obtain a mixed accelerator;
and B3, mixing the mixed iron powder, the mixed oxidant, the mixed accelerator and the sodium isobutyl naphthalene sulfonate uniformly according to the weight ratio of 1.2-10: 1:1: 0.02-0.1 to obtain the iron powder expanding agent.
More preferably, in the step B1, the iron powder is respectively sieved by sieves with the pore diameters of 0.15mm, 0.3mm, 0.6mm and 1.18mm, and the undersize iron powder is respectively taken and mixed according to the weight ratio of 19:22:24:27, so as to obtain the mixed iron powder.
Preferably, the preparation method of the modified polypropylene fiber comprises the following steps:
c1, preparing a solution from potassium dichromate, concentrated sulfuric acid and deionized water according to a weight ratio of 10:75:15, adding polypropylene fibers, and heating in a water bath at a temperature of 60-80 ℃ and a stirring speed of 200-500 r/min for 2-4 h to obtain a modified polypropylene fiber intermediate product;
c2, taking silane coupling agent and absolute ethyl alcohol according to the weight ratio of 1: 15-25, and carrying out water bath for 2h at the temperature of 60 ℃ to obtain silane hydrolysate; and washing the modified polypropylene fiber intermediate product with deionized water, filtering, adding the washed intermediate product into silane hydrolysate, soaking for 4-8 h, and drying at 80 ℃ to obtain the modified polypropylene fiber.
The patent also provides a preparation method of the multifunctional expansion fiber anti-cracking waterproof agent, which comprises the following preparation steps: uniformly mixing calcium sulphoaluminate, calcium oxide, magnesium oxide, fly ash, an iron powder expanding agent, sodium methyl silicate, sodium fluosilicate and a polycarboxylic acid high-efficiency water reducing agent; and then adding the modified sepiolite wool and the modified polypropylene fiber, and uniformly mixing to obtain the finished product of the anti-cracking waterproof agent.
Compared with the prior art, the invention has the advantages that:
1. compared with the common sepiolite wool, the anti-cracking effect is stronger by utilizing the mutual winding and crosslinking functions of the modified sepiolite wool and the modified polypropylene fiber;
2. the iron powder expanding agent, the sodium methyl silicate and other raw materials are generated through chemical reaction, so that cement pores and concrete cracks are effectively filled, and indexes of the concrete such as setting time, 48h water absorption ratio, penetration height ratio and the like are better than those of conventional products on the market;
3. the raw materials are simple and easy to obtain, the cost is lower, and the preparation process of the product is simple.
Detailed Description
The technical solutions of the present invention will be described clearly and completely below, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The preparation method of the multifunctional intumescent fiber anti-cracking waterproof agent of the following examples 1 to 5 and comparative examples 1 to 2 is as follows:
(1) preparation of modified sepiolite wool
A1, adding sepiolite wool into 2mol/L dilute hydrochloric acid according to the solid-to-liquid ratio of 1:15, stirring for 4 hours, standing for 2 days at 40 ℃, performing suction filtration, washing with deionized water, and drying to obtain acid activated sepiolite wool;
a2, mixing acid activated sepiolite wool, sodium isobutyl naphthalene sulfonate and deionized water according to the weight ratio of 1:0.15:30, and stirring uniformly at 400r/min to obtain acid activated sepiolite wool slurry;
a3, taking a silane coupling agent and absolute ethyl alcohol according to the weight ratio of 1:20, and carrying out water bath for 2 hours at the temperature of 60 ℃ to obtain silane hydrolysate; and (3) uniformly stirring the acid activated sepiolite wool and the silane hydrolysis liquid according to the weight ratio of 1:10, and drying to obtain the modified sepiolite wool.
(2) Preparation of iron powder expansion agent
B1, iron powder gradation: sieving the iron powder with sieves with the apertures of 0.15mm, 0.3mm, 0.6mm and 1.18mm respectively, and taking the iron powder under the sieves according to the weight ratio of 19:22:24:27 and mixing uniformly to obtain mixed iron powder;
b2, preparation of an oxidation catalyst: uniformly mixing potassium dichromate and potassium manganate according to the weight ratio of 2:1 to obtain a mixed oxidant; uniformly mixing ammonium chloride and sodium chloride according to the weight ratio of 2:3 to obtain a mixed accelerator;
and B3, mixing the mixed iron powder, the mixed oxidant, the mixing accelerator and the sodium isobutyl naphthalene sulfonate uniformly according to the weight ratio of 10:1:1:0.1 to obtain the iron powder expanding agent.
(3) Preparation of modified Polypropylene fiber
C1, preparing a solution from potassium dichromate, concentrated sulfuric acid and deionized water according to a weight ratio of 10:75:15, adding polypropylene fibers, and heating in a water bath at a temperature of 60-80 ℃ and a stirring speed of 200-500 r/min for 2-4 h to obtain a modified polypropylene fiber intermediate product;
and C2, washing the modified polypropylene fiber intermediate product with deionized water, filtering, adding the washed intermediate product into a silane coupling agent, soaking for 4-8 hours, and drying at 80 ℃ to obtain the modified polypropylene fiber.
(4) According to a certain weight part, calcium sulphoaluminate, calcium oxide, magnesium oxide, fly ash, iron powder expanding agent, sodium methyl silicate, sodium fluosilicate and polycarboxylic acid high-efficiency water reducing agent are uniformly mixed; then adding a certain weight part of modified sepiolite wool and modified polypropylene fiber, and uniformly mixing to obtain the finished product of the anti-cracking waterproof agent.
Examples 1 to 5 and comparative examples 1 to 2
The weight parts of calcium sulphoaluminate, calcium oxide, magnesium oxide, fly ash, iron powder expanding agent, modified sepiolite wool, modified polypropylene fiber, sodium methyl silicate, sodium fluosilicate and polycarboxylic acid high-efficiency water reducing agent in the examples 1-5 and the comparative examples 1-2 are shown in the following table 1.
Table 1 parts by weight, unit of the raw materials of examples 1 to 5 and comparative examples 1 to 2: portions are
Comparative example 3
The raw materials and the preparation method of the multifunctional anti-cracking waterproof agent for the expanded fibers provided by the comparative example are basically the same as those in the example 1, except that the modified sepiolite wool in the raw materials is replaced by the common sepiolite wool.
Comparative example 4
The raw materials and the preparation method of the multifunctional anti-cracking waterproof agent for the expanded fibers provided by the comparative example are basically the same as those in the example 1, except that the modified polypropylene fibers in the raw materials are replaced by ordinary polypropylene fibers.
Comparative example 5
The raw materials and the preparation method of the multifunctional anti-cracking waterproof agent for the expanded fibers provided by the comparative example are basically the same as those in the example 1, except that the modified sepiolite wool and the modified polypropylene fibers in the raw materials are respectively replaced by the common sepiolite wool and the common polypropylene fibers.
Application example: performance test of the multifunctional expansive fiber anti-cracking waterproof agent of examples 1 to 5 and comparative examples 1 to 5
The multifunctional expanding fiber anti-cracking waterproof agents of the examples 1 to 5 and the comparative examples 1 to 5 are added in the preparation process of the concrete, a blank group without the multifunctional expanding fiber anti-cracking waterproof agent is arranged, and the performances of the concrete prepared in the examples, the comparative examples and the blank group are respectively detected.
(1) The contact angles of water drops on the concrete surfaces of examples 1 to 5 and comparative examples 1 to 5 were measured by using a JC2000D1 contact angle measuring instrument manufactured by the morning digital technology equipment ltd; the results are given in table 2 below.
TABLE 2 Water droplet contact angles of the concretes prepared in examples 1 to 5 and comparative examples 1 to 2
As can be seen from table 2, the more the sodium methylsilicate and sodium fluorosilicate were added, the more the water-proofing effect of the concrete was evident, but the more the water-proofing effect was changed, the less the water-proofing effect was changed. The formulations of examples 1-5 were in the most moderate range.
(2) The concrete of examples 1 to 5 and comparative examples 1 to 5 were tested for properties such as net paste stability, setting time, 48h water absorption, penetration height ratio, and reinforcement corrosion, and the results are shown in table 3 below.
TABLE 3 test results of Properties of concretes prepared in examples 1 to 5 and comparative examples 1 to 2
As is clear from Table 3, the concrete of examples 1 to 5 exhibited good performance, and among them, example 1 was the best. The performance index of comparative examples 1 to 5 was improved compared to the blank group, but not at the best level.
(3) The concrete of examples 1 to 5 and comparative examples 1 to 5 were tested for their resistance to compression, bending and expansion rate limiting properties, and the results are shown in Table 4 below.
TABLE 4 of concrete prepared in examples 1 to 5 and comparative examples 1 to 2
Test result of compression resistance, fracture resistance and expansion rate limiting performance
As can be seen from Table 4, the concrete prepared in examples 1 to 5 exhibited good compression set resistance and limited expansion ratio, and the concrete prepared in example 1 exhibited the best performance.
(4) The concrete prepared in examples 1 to 5 and comparative examples 1 to 2 were examined for their chloride ion diffusion coefficient, and the results are shown in Table 5 below.
TABLE 4 results of measuring diffusion coefficient of chloride ion of concrete prepared in examples 1 to 5 and comparative examples 1 to 2
| Group name | 3d | 28d | 56d |
| Example 1 | 10.49 | 6.73 | 3.79 |
| Example 2 | 10.57 | 7.05 | 4.38 |
| Example 3 | 10.79 | 6.97 | 4.12 |
| Example 4 | 11.05 | 7.12 | 3.98 |
| Example 5 | 10.97 | 6.85 | 3.89 |
| Comparative example 1 | 13.18 | 8.66 | 4.61 |
| Comparative example 2 | 13.23 | 8.69 | 4.37 |
| Comparative example 3 | 14.27 | 8.53 | 4.03 |
| Comparative example 4 | 15.24 | 8.91 | 4.78 |
| Comparative example 5 | 14.79 | 8.84 | 4.58 |
| Blank group | 14.79 | 11.46 | 6.73 |
As can be seen from the above table, the chloride ion diffusion coefficients of the concrete prepared in embodiments 1 to 5 are relatively low, which proves that the addition of the modified sepiolite wool and the modified polypropylene fiber can improve the pore structure of the concrete, hinder the diffusion of chloride ions in the concrete, reduce the corrosion effect on steel bars, and prolong the service life of the building. Whereas the effect of adding sepiolite wool and polypropylene fibres is relatively weak.
Claims (4)
1. The multifunctional anti-cracking waterproof agent for the expanded fibers is characterized by comprising 12-22 parts by weight of calcium sulphoaluminate, 6.5 parts by weight of calcium oxide, 6.5 parts by weight of magnesium oxide, 18.5 parts by weight of fly ash, 5-7 parts by weight of an iron powder expanding agent, 3-6.8 parts by weight of modified sepiolite wool, 1-3.5 parts by weight of modified polypropylene fibers, 3 parts by weight of sodium methyl silicate, 1 part by weight of sodium fluosilicate and 2.5 parts by weight of a polycarboxylic acid high-efficiency water reducing agent;
the preparation method of the modified sepiolite wool comprises the following steps:
a1, adding sepiolite wool into 2mol/L dilute hydrochloric acid according to the solid-to-liquid ratio of 1:15, stirring for 2-6 h, standing for 1-2 d at 40 ℃, performing suction filtration, washing with deionized water, and drying to obtain acid-activated sepiolite wool;
a2, mixing acid activated sepiolite wool, sodium isobutyl naphthalenesulfonate and deionized water according to the weight ratio of 1:0.15:30, and stirring uniformly at 200-500 r/min to obtain acid activated sepiolite wool slurry;
a3, taking a silane coupling agent and absolute ethyl alcohol according to the weight ratio of 1: 15-25, and carrying out water bath for 2h at the temperature of 60 ℃ to obtain silane hydrolysate; taking acid activated sepiolite velvet slurry and silane hydrolysis liquid according to the weight ratio of 1:10, uniformly stirring, and drying to obtain modified sepiolite velvet;
the preparation method of the iron powder expanding agent comprises the following steps:
b1, iron powder gradation: sieving the iron powder by using sieves with the aperture of 0.15mm, 0.3mm, 0.6mm and 1.18mm respectively, and taking the iron powder as undersize products according to the weight ratio of 18-23: 20-25: 23-27: 25-30 and mixing uniformly to obtain mixed iron powder;
b2, preparation of an oxidation catalyst: uniformly mixing potassium dichromate and potassium manganate according to the weight ratio of 2:1 to obtain a mixed oxidant; uniformly mixing ammonium chloride and sodium chloride according to the weight ratio of 2:3 to obtain a mixed accelerator;
b3, mixing the mixed iron powder, the mixed oxidant, the mixed accelerator and the sodium isobutylnaphthalenesulfonate uniformly according to the weight ratio of 1.2-10: 1:1: 0.02-0.1 to obtain the iron powder expanding agent;
the preparation method of the modified polypropylene fiber comprises the following steps:
c1, preparing a solution from potassium dichromate, concentrated sulfuric acid and deionized water according to a weight ratio of 10:75:15, adding polypropylene fibers, and heating in a water bath at a temperature of 60-80 ℃ and a stirring speed of 200-500 r/min for 2-4 h to obtain a modified polypropylene fiber intermediate product;
c2, taking silane coupling agent and absolute ethyl alcohol according to the weight ratio of 1: 15-25, and carrying out water bath for 2h at the temperature of 60 ℃ to obtain silane hydrolysate; and washing the modified polypropylene fiber intermediate product with deionized water, filtering, adding the washed intermediate product into silane hydrolysate, soaking for 4-8 h, and drying at 80 ℃ to obtain the modified polypropylene fiber.
2. The multifunctional anti-cracking waterproof agent for the expanded fibers as claimed in claim 1, which is characterized by comprising 18 parts by weight of calcium sulphoaluminate, 6.5 parts by weight of calcium oxide, 6.5 parts by weight of magnesium oxide, 18.5 parts by weight of fly ash, 6.5 parts by weight of an iron powder expanding agent, 6 parts by weight of modified sepiolite wool, 3 parts by weight of modified polypropylene fibers, 3 parts by weight of sodium methyl silicate, 1 part by weight of sodium fluosilicate and 2.5 parts by weight of a polycarboxylic acid high-efficiency water reducing agent.
3. The multifunctional anti-cracking waterproof agent for expanded fibers as claimed in claim 1, wherein in step B1, the iron powder is respectively sieved through sieves with apertures of 0.15mm, 0.3mm, 0.6mm and 1.18mm, and the iron powder under the sieves is respectively taken according to the weight ratio of 19:22:24:27 and is uniformly mixed to obtain the mixed iron powder.
4. The preparation method of the multifunctional type expansive fiber anti-cracking waterproof agent as claimed in claim 1 or 2, which is characterized by comprising the following steps: uniformly mixing calcium sulphoaluminate, calcium oxide, magnesium oxide, fly ash, an iron powder expanding agent, sodium methyl silicate, sodium fluosilicate and a polycarboxylic acid high-efficiency water reducing agent; and then adding the modified sepiolite wool and the modified polypropylene fiber, and uniformly mixing to obtain the finished product of the anti-cracking waterproof agent.
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Effective date of registration: 20230607 Address after: 301500 West of Yuelong Village, Yuelong Town, Ninghe District, Tianjin Patentee after: TIANJIN JINSHENGYUAN SPECIAL BUILDING MATERIALS Co.,Ltd. Address before: 361026 one of No.2 Xiafei Road, Xinyang street, Haicang District, Xiamen City, Fujian Province Patentee before: XIAMEN HAOYOU BUILDING MATERIALS Co.,Ltd. |