CN113861669A - Crack repairing agent and preparation method thereof - Google Patents
Crack repairing agent and preparation method thereof Download PDFInfo
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- CN113861669A CN113861669A CN202111028924.9A CN202111028924A CN113861669A CN 113861669 A CN113861669 A CN 113861669A CN 202111028924 A CN202111028924 A CN 202111028924A CN 113861669 A CN113861669 A CN 113861669A
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Classifications
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- C—CHEMISTRY; METALLURGY
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- C—CHEMISTRY; METALLURGY
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- Chemical & Material Sciences (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Polyurethanes Or Polyureas (AREA)
- Road Repair (AREA)
Abstract
The invention discloses a crack repairing agent and a preparation method thereof, wherein the crack repairing agent comprises the following components in parts by mass: 20-30 parts of polyether polyol, 2-10 parts of lignocellulose, 3-10 parts of isocyanate, 0.01-0.5 part of catalyst, 5-10 parts of diluent solvent, 20-25 parts of calcium powder, 25-30 parts of plasticizer, 2-15 parts of rubber powder and 0.5-3 parts of thickener. By adding polyether polyol and isocyanate, polyurethane is obtained; the prepared repairing agent has high stability through the synergistic effect of the lignocellulose and the polyurethane, and after the repairing agent is used for repairing cracked holes of products made of cement materials or asphalt materials, the repaired products have high bonding strength and strong seepage-proof, crack-proof, anti-freezing and heat-proof capabilities, namely, the repairing agent has good repairing effect and long retention time on the cracked holes of the cement products or the asphalt products.
Description
Technical Field
The invention relates to the technical field of micropore restoration, in particular to a crack restoration agent and a preparation method thereof.
Background
The asphalt has wide application, can be used for paving asphalt pavements, and can be mixed with other materials to prepare products such as asphalt paint, asphalt felt, asphalt rubber, asphalt coating, asphalt waterproof coiled materials, asphalt insulating cement and the like.
As one of three basic materials in the building industry, cement is the most used building material, has wide application and large using amount, is used as a powdery hydraulic inorganic cementing material, is usually mortar or concrete prepared by adding water and stirring, and is widely applied to construction engineering, traffic engineering, offshore platforms and other infrastructure engineering.
Asphalt and cement are mostly applied outdoors, and under the outdoor day and night replacement climate, cracks are easy to appear due to the influence of expansion with heat and contraction with cold, and the use effect is influenced. Taking a sports track as an example, the sports track is divided into a cast-in-place track and a prefabricated track, and the cast-in-place track sequentially comprises a base layer, a basal surface treatment layer (a sealing layer), an elastic layer, a binding layer and an anti-skid layer from bottom to top; the prefabricated runway is characterized in that a base layer, a base surface treatment layer (a closed layer), an adhesive layer, (a fiber layer, an elastic layer and an anti-slip layer) are sequentially integrated from bottom to top. That is, the current sports track generally includes the foundation layer, and the foundation layer is pitch material or cement material, appears crackle, rises and subsides phenomenons such as easily, but the planarization of foundation layer determines the life-span of track elastic layer, and more serious can destroy the structural nature of elastic layer, makes the track lose original shock resistance, elasticity performance to make the track have very big potential safety hazard in the use.
Disclosure of Invention
The invention mainly aims to provide a crack repairing agent and a preparation method thereof, and aims to provide a crack repairing agent capable of repairing cracks, depressions and seepage seams of cement and asphalt products.
In order to achieve the purpose, the invention provides a crack repairing agent, which comprises the following components in parts by mass:
20-30 parts of polyether polyol, 2-10 parts of lignocellulose, 3-10 parts of isocyanate, 0.01-0.5 part of catalyst, 5-10 parts of diluent solvent, 20-25 parts of calcium powder, 25-30 parts of plasticizer, 2-15 parts of rubber powder and 0.5-3 parts of thickener.
Optionally, the polyether polyol has a weight average molecular weight of 2000-3000.
Optionally, the polyether polyol comprises at least one of a polyoxypropylene diol, a polyoxyethylene diol, a polyoxypropylene polyether triol, and a oxypropylene-oxyethylene copolyol.
Optionally, the isocyanate comprises at least one of toluene diisocyanate and diphenylmethane-4, 4' -diisocyanate.
Optionally, the catalyst comprises dibutyl tin dilaurate.
Optionally, the dilution solvent is at least one of ethyl acetate and butyl acetate.
Optionally, the plasticizer comprises any one of tributyl citrate and long-chain paraffin wax.
Optionally, the glue powder comprises VAE glue powder.
Optionally, the thickener comprises at least one of titanium dioxide and kaolin.
Further, the invention also provides a preparation method of the crack repairing agent, which comprises the following steps:
uniformly mixing polyether polyol, a plasticizer, calcium powder and a thickening agent to obtain a mixed solution;
heating the mixed solution to 70-90 ℃, then adding isocyanate and a catalyst into the mixed solution, and stirring for reacting for 1-3 hours to obtain an intermediate solution;
and cooling the intermediate solution to 25-35 ℃, then adding lignocellulose, rubber powder and a diluting solvent into the intermediate solution, and stirring and reacting for 10-20 min to obtain the crack repairing agent.
The crack repairing agent provided by the invention is prepared by taking polyether polyol, lignocellulose, isocyanate, a catalyst, a diluting solvent, calcium powder, a plasticizer, rubber powder and a thickening agent as raw materials in a proper proportion, and polyurethane is obtained by adding polyether polyol and isocyanate; the prepared repairing agent has high stability through the synergistic effect of the lignocellulose and the polyurethane, and after the repairing agent is used for repairing cracked holes of products made of cement materials or asphalt materials, the repaired products have high bonding strength and strong seepage-proof, crack-proof, anti-freezing and heat-proof capabilities, namely, the repairing agent has good repairing effect and long retention time on the cracked holes of the cement products or the asphalt products.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other related drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of an embodiment of a method for preparing a fracture repairing agent according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention. 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.
Asphalt and cement are mostly applied outdoors, and under the outdoor day and night replacement climate, cracks are easy to appear due to the influence of expansion with heat and contraction with cold, and the use effect is influenced. Taking a sports ground track as an example, the foundation layer of the sports ground track is made of asphalt or cement, so that the phenomena of crack, bulge, settlement and the like are easy to occur, the smoothness of the foundation layer determines the service life of the elastic layer of the track, the structural performance of the elastic layer can be seriously damaged, the original impact resistance and the original elastic performance of the track are lost, and the track has great potential safety hazard in the using process. And in the 6 th part of the GB/T22517.6-2011 sports ground use requirement and inspection method: in the track and field ground, the roughness of the ground foundation is required: (class I field) no gap of more than 6mm is formed below 4m of the ruler; or there should be no gap of >3mm under a 1m ruler.
In view of the above, the invention provides a crack repairing agent, which aims to repair cracks of cement products or asphalt products and ensure the using effect of the crack repairing agent. The crack repairing agent comprises the following components in parts by mass: 20-30 parts of polyether polyol, 2-10 parts of lignocellulose, 3-10 parts of isocyanate, 0.01-0.5 part of catalyst, 5-10 parts of diluent solvent, 20-25 parts of calcium powder, 25-30 parts of plasticizer, 2-15 parts of rubber powder and 0.5-3 parts of thickener.
The crack repairing agent provided by the invention is prepared by taking polyether polyol, lignocellulose, isocyanate, a catalyst, a diluting solvent, calcium powder, a plasticizer, rubber powder and a thickening agent as raw materials in a proper proportion, and polyurethane is obtained by adding polyether polyol and isocyanate; the prepared repairing agent has high stability through the synergistic effect of the lignocellulose and the polyurethane, and after the repairing agent is used for repairing cracked holes of products made of cement materials or asphalt materials, the repaired products have high bonding strength and strong seepage-proof, crack-proof, anti-freezing and heat-proof capabilities, namely, the repairing agent has good repairing effect and long retention time on the cracked holes of the cement products or the asphalt products.
The polyether polyol is added in an amount of 20 to 30 parts, that is, 20 parts, 22 parts, 25 parts, 28 parts, 30 parts and the like. The present invention is not limited to the specific species of the polyether polyol as long as the polyurethane can be polymerized with isocyanate. In this embodiment, the weight average molecular weight of the polyether polyol is 2000 to 3000, that is, 2000, 2200, 2300, 2500, 2700, 3000, or the like. Further, the polyether polyol includes at least one of polyoxypropylene diol, polyoxyethylene diol, polyoxypropylene polyether triol, and oxypropylene-oxyethylene copolyol.
Preferably, the polyether polyol is a mixture of diol and triol, wherein the diol has higher hardness, and the triol has elasticity, so that the prepared crack repairing agent has better elasticity and toughness. That is, preferably, the polyether polyol includes a component a including at least one of polyoxypropylene diol and polyoxyethylene diol, and a component B including at least one of propylene polyether triol and oxypropylene-oxyethylene copolyol.
The addition amount of the lignocellulose is 2-10 parts, namely, 2 parts, 5 parts, 7 parts, 8 parts, 10 parts and the like. The lignocellulose is natural renewable wood, is an organic flocculent fiber substance obtained by chemical treatment and mechanical processing, and has no toxicity, no smell, no pollution and no radioactivity. The lignocellulose has excellent flexibility and dispersibility, and can be easily mixed with the polyurethane to form a three-dimensional network structure, so that the supporting force and the durability of the polyurethane are enhanced, and the stability, the strength, the compactness and the uniformity of the polyurethane can be improved; due to the structural viscosity of the lignocellulose, the prepared crack repairing agent keeps the uniformity of the crack repairing agent in an original state and has good stability; the lignocellulose has excellent dimensional stability and thermal stability, so that the prepared crack repairing agent has good heat preservation and crack resistance effects; in addition, the lignocellulose can adsorb moisture 6-8 times of the self weight, so that the interface hydration reaction of the repairing agent and a cement surface or an asphalt surface is sufficient, and the surface strength of the repairing agent and the bonding strength of a cement product or an asphalt product are improved.
The amount of the isocyanate added is 3 to 10 parts, that is, 3 parts, 5 parts, 7 parts, 10 parts. In this embodiment, the isocyanate includes at least one of toluene diisocyanate and diphenylmethane-4, 4' -diisocyanate.
The addition amount of the catalyst is 0.01-0.5 parts, namely 0.01 part, 0.05 part, 0.1 part, 0.2 part, 0.35 part, 0.5 part and the like. The catalyst is used for catalyzing polyether polyol and isocyanate to polymerize to form polyurethane, the invention does not limit the specific type of the catalyst, and in the embodiment, the catalyst is dibutyltin dilaurate.
The addition amount of the plasticizer is 25 to 30 parts, that is, 25 parts, 27 parts, 28 parts, and 30 parts. In this embodiment, the plasticizer is any one of tributyl citrate and long-chain paraffin wax. Further, the long-chain paraffin is 52-degree paraffin.
The amount of the diluent solvent is 5 to 10 parts, that is, 5 parts, 6 parts, 7 parts, 9 parts, 10 parts, or the like. In this embodiment, the dilution solvent is at least one of ethyl acetate and butyl acetate.
The addition amount of the calcium powder is 20-25 parts, namely, 20 parts, 22 parts, 23 parts, 25 parts and the like. The calcium powder is used as the filling powder, the specific particle size of the calcium powder is not limited, and in order to enable the repair effect of the prepared repair agent to be good, the calcium powder is 1000-2000 meshes.
The addition amount of the plasticizer is 25 to 30 parts, that is, 25 parts, 26 parts, 27 parts, 30 parts and the like, and in the embodiment, the plasticizer is tributyl citrate.
The addition amount of the rubber powder is 2-15 parts, namely 2 parts, 5 parts, 6 parts, 9 parts, 10 parts, 15 parts and the like. In this example, the gum powder is VAE (ethylene and vinyl acetate copolymer) gum powder. The VAE glue powder has high binding capacity and unique properties, such as: water resistance, construction performance, heat insulation performance and the like, and the prepared crack repairing agent has good seepage-proofing and crack-resisting effects due to the matching of the VAE rubber powder and the lignocellulose.
The addition amount of the thickener is 0.5-3 parts, that is, 0.5 part, 0.7 part, 1 part, 2 parts and 3 parts, and in this embodiment, the thickener includes at least one of titanium dioxide and kaolin. It will be appreciated that titanium dioxide and kaolin also function as whitening agents.
Further, the use method of the crack repair agent comprises the following steps:
a1, mixing the crack repairing agent and water according to a mass ratio of 100: 0.5-5 to obtain a mixture;
and A2, pouring the mixture into the crack or concave position of the runway foundation layer, and finishing the repair after the mixture is cured.
The crack-repairing agent is used as it is. Specifically, in the crack repairing agent, polyurethane prepolymer obtained by polyether polyol and isocyanate under the action of a catalyst is present. Before the crack repairing agent is used, the crack repairing agent is mixed with water, the water is used as a chain extender, the crack repairing agent is reacted to obtain polyurethane, and lignocellulose is redispersed in the polyurethane to form a three-dimensional space structure, so that various performances of the polyurethane are enhanced; in addition, the lignocellulose can adsorb partial moisture participating in the reaction, and the speed of the chain extension reaction can be properly controlled, so that the phenomena of foaming and hollowing caused by over-quick reaction are reduced. Wherein, the water can be tap water or deionized water. At present, a technical scheme of using alcohol and thioether as chain extenders of polyurethane prepolymers exists, although polyurethane can be obtained, the reaction rate is slow, and the polyurethane can be cured within 3-5 hours, and the invention adopts water as the chain extenders, and the curing can be completed within 0.5-2 hours.
In addition, there are also situations where the polyurethane sealing material is used to backfill and seal cracks and grooves of asphalt products or cement products (such as a track foundation layer), but because the polyurethane sealing material does not contain lignocellulose and VAE rubber powder, the polyurethane sealing material has the following disadvantages (the polyurethane sealing material is taken as an example for the track foundation layer): 1) the polyurethane material is easily influenced by the rising temperature in the coating reaction process, stock is generated in the material curing process to cause the local volume increase, and the material density and the strength are reduced; after the coating is finished, when the external temperature suddenly drops, the material is easy to shrink to cause cracking, so that the drying time is prolonged, and the construction progress of the next step is influenced; 2) when the repairing agent is used for repairing cracked holes of asphalt products or cement products, the interior of the repairing agent is easy to form a honeycomb-like structure after curing, partial cracking and other phenomena occur, and the maintenance time of the repaired finished products is short; 3) the thermal expansion and cold contraction resistance is inferior, the temperature difference between day and night is large in some places for a long time, so that the base layer is heated unevenly, expansion and deformation phenomena exist in expansion cracks, and the polyurethane sealing material without lignocellulose is damaged by force, so that deformation of different degrees can occur; 4) the physical properties of the polyurethane sealing material decrease rapidly with time due to frequent use above the later base layer.
Compared with the technical scheme of the polyurethane sealing material, the technical scheme of the invention obtains the repairing agent which has good stability, good repairing effect on the crack of the cement or asphalt product and long retention time through the design of the components of the crack repairing agent and the proportion of the components. Specifically, the lignocellulose and the polyurethane are added in appropriate amount, so that the lignocellulose forms a three-dimensional net structure in the polyurethane, the three-dimensional structure enhances the supporting force and the durability of the polyurethane, and the stability, the strength, the compactness and the uniformity of the polyurethane can be improved, thereby ensuring the physical properties of a repaired product; meanwhile, the lignocellulose has excellent dimensional stability and thermal stability, and plays good roles of heat preservation, crack resistance, freezing prevention and heat resistance in polyurethane; the lignocellulose can adsorb moisture with the self weight of 6-8 times, so that the interface hydration reaction of the repairing agent and a cement surface or an asphalt surface is sufficient, and the surface strength of the repairing agent and the bonding strength of a cement product or an asphalt product are improved; in addition, through the design of the addition and the addition amount of the VAE rubber powder, the VAE rubber powder and the lignocellulose are mutually matched to generate a synergistic effect, so that the prepared crack repairing agent has good seepage-proofing and crack-resisting effects.
Based on the above purpose, the present invention also provides a preparation method of the above fracture repairing agent, which comprises the following steps:
step S10, uniformly mixing polyether polyol, a plasticizer, calcium powder and a thickening agent to obtain a mixed solution;
the invention does not limit the concrete mode of uniformly mixing the polyether polyol, the plasticizer, the calcium powder and the thickening agent, and can be uniformly mixed by continuously stirring or uniformly dispersed in a dispersion machine. In the embodiment, the polyether polyol, the plasticizer, the calcium powder and the thickening agent are placed in a dispersion machine to be dispersed at a high speed for 20-40 min under the condition of 800-2000 r/min, so that the polyether polyol, the plasticizer, the calcium powder and the thickening agent are uniformly mixed.
Step S20, heating the mixed solution to 70-90 ℃, then adding isocyanate and a catalyst into the mixed solution, and stirring and reacting for 1-3 hours to obtain an intermediate solution;
specifically, pouring the mixed solution into a four-neck flask, heating to 70-90 ℃ by a program, dropwise adding isocyanate and a catalyst, and fully stirring for reaction for 1-3 hours to obtain an intermediate solution.
And step S30, cooling the intermediate solution to 25-35 ℃, then adding lignocellulose, rubber powder and a diluent solvent into the intermediate solution, and stirring and reacting for 10-20 min to obtain the crack repairing agent.
Specifically, the temperature of the intermediate solution is reduced to 25-35 ℃, lignocellulose and rubber powder are uniformly mixed in a diluting solvent, then the mixture is poured into the intermediate solution, and the mixture is stirred and reacts for 10-20 min to obtain the crack repairing agent.
The technical solutions of the present invention are further described in detail below with reference to specific examples and drawings, it should be understood that the following examples are merely illustrative of the present invention and are not intended to limit the present invention.
Example 1
The crack repairing agent comprises the following components in parts by mass: 26.5 parts of polyether polyol (wherein the polyether polyol is a mixture of polyoxypropylene polyether triol having a weight average molecular weight of 3000 and polyoxyethylene glycol having a weight average molecular weight of 2000), 3 parts of lignocellulose, 5.5 parts of toluene diisocyanate, 0.03 part of dibutyltin dilaurate, 6 parts of ethyl acetate, 23 parts of calcium powder (particle size of 2000 meshes), 25 parts of
Tributyl citrate, 3 parts of VAE rubber powder and 1 part of titanium dioxide.
Example 2
The crack repairing agent comprises the following components in parts by mass: 26.5 parts of polyoxypropylene polyether triol (weight average molecular weight of 3000), 5 parts of lignocellulose, 5 parts of diphenylmethane-4, 4' -diisocyanate, 0.06 part of dibutyltin dilaurate, 6 parts of butyl acetate, 23 parts of calcium powder (particle size of 1000 meshes) and 25 parts of
Tributyl citrate, 5 parts of VAE rubber powder and 1 part of kaolin.
Example 3
The crack repairing agent comprises the following components in parts by mass: 20 parts of polyoxyethylene glycol (weight average molecular weight 2000), 2 parts of lignocellulose, 3 parts of toluene diisocyanate, 0.01 part of dibutyltin dilaurate, 5 parts of ethyl acetate, 20 parts of calcium powder (particle size of 2000 meshes), 27 parts of tributyl citrate, 15 parts of VAE rubber powder and 0.5 part of titanium dioxide.
Example 4
The crack repairing agent comprises the following components in parts by mass: 30 parts of propylene oxide-ethylene oxide copolymer triol (the weight average molecular weight is 3000), 10 parts of lignocellulose, 10 parts of toluene diisocyanate, 0.5 part of dibutyltin dilaurate, 10 parts of ethyl acetate, 25 parts of calcium powder (the particle size is 1500 meshes), 30 parts of tributyl citrate, 2 parts of VAE rubber powder and 3 parts of titanium dioxide.
Example 5
(1) The formulation of the crack repair agent was the same as in example 1;
(2) placing polyether polyol, a plasticizer, calcium powder and a thickening agent in a dispersion machine, and dispersing at a high speed for 30min under the condition of 1000r/min to uniformly mix the polyether polyol, the plasticizer, the calcium powder and the thickening agent to obtain a mixed solution;
(3) pouring the mixed solution into a four-neck flask, heating the mixed solution to 80 ℃ by a program, dropwise adding isocyanate and a catalyst into the mixed solution, and fully stirring the mixed solution for reaction for 2 hours to obtain an intermediate solution;
(4) and cooling the intermediate solution to 30 ℃, uniformly mixing the lignocellulose and the rubber powder in a diluting solvent, pouring the mixture into the intermediate solution, and stirring and reacting for 15min to obtain the crack repairing agent.
Example 6
(1) The formulation of the crack repair agent was the same as in example 2;
(2) placing polyether polyol, a plasticizer, calcium powder and a thickening agent in a dispersion machine, and dispersing at a high speed for 20min under the condition of 2000r/min to uniformly mix the polyether polyol, the plasticizer, the calcium powder and the thickening agent to obtain a mixed solution;
(3) pouring the mixed solution into a four-neck flask, heating the mixed solution to 70 ℃ by a program, dropwise adding isocyanate and a catalyst into the mixed solution, and fully stirring the mixed solution for reaction for 3 hours to obtain an intermediate solution;
(4) and cooling the intermediate solution to 25 ℃, uniformly mixing the lignocellulose and the rubber powder in a diluting solvent, pouring the mixture into the intermediate solution, and stirring and reacting for 20min to obtain the crack repairing agent.
Example 7
(1) The formulation of the crack repair agent was the same as in example 3;
(2) placing polyether polyol, a plasticizer, calcium powder and a thickening agent in a dispersion machine, and dispersing at a high speed for 40min under the condition of 800r/min to uniformly mix the polyether polyol, the plasticizer, the calcium powder and the thickening agent to obtain a mixed solution;
(3) pouring the mixed solution into a four-neck flask, heating the mixed solution to 90 ℃ by a program, dropwise adding isocyanate and a catalyst into the mixed solution, and fully stirring the mixed solution for reaction for 1 hour to obtain an intermediate solution;
(4) and cooling the intermediate solution to 35 ℃, uniformly mixing the lignocellulose and the rubber powder in a diluting solvent, pouring the mixture into the intermediate solution, and stirring for reaction for 10min to obtain the crack repairing agent.
Example 8
The procedure was the same as in example 5 except that the formulation of the crack repair agent in step (1) was modified to be the same as in example 4.
Comparative example 1
The repairing agent comprises the following components in parts by mass: 26.5 parts of polyether polyol (wherein the polyether polyol is a mixture of polyoxypropylene polyether triol with the weight-average molecular weight of 3000 and polyoxyethylene glycol with the weight-average molecular weight of 2000), 5.5 parts of toluene diisocyanate, 0.03 part of dibutyltin dilaurate, 6 parts of ethyl acetate, 23 parts of calcium powder (the particle size is 2000 meshes), 25 parts of tributyl citrate and 1 part of titanium dioxide.
Comparative example 2
The repairing agent comprises the following components in parts by mass: 26.5 parts of polyoxypropylene diol (polyoxypropylene polyether triol having a weight average molecular weight of 3000 and polyoxyethylene diol having a weight average molecular weight of 2000), 6 parts of lignocellulose, 5.5 parts of toluene diisocyanate, 0.03 part of dibutyltin dilaurate, 6 parts of ethyl acetate, 23 parts of calcium powder (particle size of 2000 mesh), 25 parts of tributyl citrate and 1 part of titanium dioxide.
Comparative example 3
The crack repairing agent comprises the following components in parts by mass: 26.5 parts of polyoxypropylene diol (polyoxypropylene polyether triol having a weight average molecular weight of 3000 and polyoxyethylene diol having a weight average molecular weight of 2000), 5.5 parts of toluene diisocyanate, 0.03 part of dibutyltin dilaurate, 6 parts of ethyl acetate, 23 parts of calcium powder (particle size of 2000 mesh), 25 parts of tributyl citrate, 6 parts of VAE rubber powder and 1 part of
Titanium dioxide.
Comparative example 4
The procedure was the same as in example 5 except that the formulation of the crack repairing agent in step (1) was modified to be the same as in comparative example 1.
Comparative example 5
The procedure was the same as in example 5 except that the formulation of the crack repairing agent in step (1) was modified to be the same as in comparative example 2.
Comparative example 6
The procedure was the same as in example 5 except that the formulation of the crack repairing agent in step (1) was modified to be the same as in comparative example 3.
The crack repairing agents prepared in the example 5 and the comparative examples 4 to 6 with the same mass are weighed and mixed with tap water to obtain prepared samples 1 to 5, wherein the sample 1 is prepared by mixing 100 parts of the crack repairing agent prepared in the example 5 with 2 parts of water, the sample 2 is prepared by mixing 100 parts of the repairing agent prepared in the comparative example 4 with 2 parts of water, the sample 3 is prepared by mixing 100 parts of the repairing agent prepared in the comparative example 4 with 5 parts of water, the sample 4 is prepared by mixing 100 parts of the repairing agent prepared in the comparative example 5 with 2 parts of water, and the sample 5 is prepared by mixing 100 parts of the repairing agent prepared in the comparative example 6 with 2 parts of water (it is required to say that the repairing agent and the water are all calculated by mass), part of mechanical bubbles are eliminated during mixing, the samples are poured into the crack of an asphalt product (taking a track base layer prepared by asphalt as an example here), and the apparent drying time and the actual drying time of the samples are tested (the test is based on JC/T482-,2003, surface dry time is less than or equal to 24h), hardness (according to JJG304-2003), tensile strength (according to GB/T36246-: not less than 0.5), elongation at break (detection according to GB/T14833 and 2020: not less than 50), impact absorption (according to GB/T36246-: 35-50%) and a vertical deformation value (according to GB/T36246-: 0.6-2.5), the test results are shown in table 1.
It should be noted that, the test conditions are performed at room temperature, and the performance of the crack repairing agent is not greatly affected by whether the product is asphalt or a cement material, so that, taking the asphalt product as an example here, the asphalt product is a self-made model, the crack hole is 2cm, each test is repeated four times, and an average value is taken, the experimental phenomena are as follows, and the specific test data are shown in table 1.
1. Experimental phenomena: sample 1(100 parts crack repair agent from example 5 +2 parts water): filling the sample into a 2cm crack of an asphalt product, wherein the sample has good fluidity and reaches a self-leveling state; the crack penetration speed is high, the phenomena of foaming and hollowing do not occur, the strength is improved within 8 hours, the drawing is difficult to break (the wood is uniformly dispersed) in longitudinal cutting, the crack can be effectively stuck tightly after the drying and the solidification, the extensibility is good, the pulverization and the cracking are not generated, and the like, and the original state can be kept for a long time (500 hours) in the sun or at low temperature.
Sample 2(100 parts of the repair agent of comparative example 4 +2 parts of water): filling the crack of 2cm pitch product into the fluid, needing external force to hang and scribble and imbed the fluid in the crack, easily receive the influence of external upward temperature in the surface dry process, cut open inside and discover a certain amount of bulging obturator, the bulk strength goes up slowly, softer, slight yellow phenomenon.
Sample 3(100 parts of the repair agent of comparative example 4 +5 parts water): basically, the present state of the strength is maintained at a low temperature, as in sample 2, with sample 3 drying quickly and having many pores at high temperature.
Sample 4(100 parts of the repair agent of comparative example 5 +2 parts of water): micro pores and hollows do not appear in longitudinal cutting observation, the crack deep part can be completely covered, the tear resistance degree and the flowability are slightly higher, the hardness is better than that of the samples 2 and 3, the physical performance is improved, but the agglomeration phenomenon occurs due to insufficient dispersion of lignocellulose in the repairing agent.
Sample 5(100 parts of the remediation agent of comparative example 6 +2 parts water): the flowability is obviously superior to that of a sample 2-4, the semi-self-leveling state is achieved, the cellulose-lacking strength is slightly superior to that of a traditional product, a small amount of micropores are formed in longitudinal cutting observation, and the drying and fixing speed is the same as that of the traditional product.
2. Test data
Table 1 results of performance testing
As can be seen from Table 1, when sample 1 prepared from the crack repairing agent prepared in example 5 of the present invention is used for repairing cracks, the comprehensive performance is better than that of samples 2-5 prepared in comparative examples. Specifically, the surface drying time and the actual drying time of the sample 1 at 20 ℃, 25 ℃ and 30 ℃ are both short, the elongation at break is high, namely, the crack resistance is high (as can be seen from the elongation at break), the freezing resistance is high (as can be seen from the hardness at 0 ℃), the compression resistance is stable (as can be seen from the impact absorption), and in addition, the parameters of the repaired asphalt product, such as the vertical deformation, the dry-solid time impact absorption and the tensile strength, meet the runway standard and do not influence the use performance. It can be seen from samples 2 and 3 that the reaction is faster by adding more water to the repairing agent, so that the actual drying time and the surface drying time are shorter, and the reaction is faster at higher temperature, therefore, the crack repairing agent prepared by the invention can be selected to be added with less water when used in the south (high temperature), and is added with more water when used in the north under the low temperature condition. It can be seen from sample 4 that the addition of only lignocellulose (the addition of lignocellulose is the sum of the addition of lignocellulose and VAE gum powder in sample 1) results in shorter dry-set time, improved shore hardness, tensile strength, bond strength and elongation at break compared to sample 2 without lignocellulose, but still less effective than sample 1. It can be seen from sample 5 that the addition of only VAE rubber powder (the addition amount of VAE rubber powder is the sum of the addition amounts of lignocellulose and VAE rubber powder of sample 1) improves the performance to some extent compared to sample 2, which is the addition of VAE rubber powder, but is inferior to sample 1. Therefore, it can be seen from samples 4 and 5 that the use of lignocellulose and rubber powder in combination plays an important role in providing product performance, and even if one of the lignocellulose and rubber powder is absent, the product performance is obviously weakened, which indicates that the lignocellulose and the rubber powder play a synergistic role in improving the performance of the crack repairing agent.
In conclusion, the crack repairing agent prepared by the invention is short in surface drying time and actual drying time when used for repairing cracks, grooves and seepage seams of asphalt or cement products through the design of the components and the proportion of the components, so that the next construction can be rapidly carried out, and the construction time is saved; meanwhile, the product repaired by the crack repairing agent has excellent physical properties and good seepage-proofing, crack-resisting, anti-freezing and heat-resisting effects, and the repaired product meets the national standard, i.e. the crack repairing agent has good repairing effect on the product and cannot influence the subsequent use effect; in addition, the maintenance time of the repaired product is long, and particularly, the quality of the repaired product can be maintained for 3-5 years.
It should be noted that, since the principles and the like of examples 6 to 8 are similar to those of example 5, the effect of the microporous repairing agent prepared by the method is similar to that of example 5, and the detailed description thereof is omitted.
The above is only a preferred embodiment of the present invention, and it is not intended to limit the scope of the invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall be included in the scope of the present invention.
Claims (10)
1. The crack repairing agent is characterized by comprising the following components in parts by mass:
20-30 parts of polyether polyol, 2-10 parts of lignocellulose, 3-10 parts of isocyanate, 0.01-0.5 part of catalyst, 5-10 parts of diluent solvent, 20-25 parts of calcium powder, 25-30 parts of plasticizer, 2-15 parts of rubber powder and 0.5-3 parts of thickener.
2. The crack repairing agent according to claim 1, wherein the polyether polyol has a weight average molecular weight of 2000 to 3000.
3. The crack healing agent of claim 1, wherein the polyether polyol comprises at least one of a polyoxypropylene diol, a polyoxyethylene diol, a polyoxypropylene polyether triol, and a oxypropylene-oxyethylene copolyol.
4. The crack repairing agent of claim 1, wherein the isocyanate comprises at least one of toluene diisocyanate and diphenylmethane-4, 4' -diisocyanate.
5. The crack healing agent of claim 1, wherein the catalyst comprises dibutyl tin dilaurate.
6. The fracture healer according to claim 1, wherein the diluent solvent is at least one of ethyl acetate and butyl acetate.
7. The crack repairing agent of claim 1, wherein the plasticizer comprises any one of tributyl citrate and long chain paraffin wax.
8. The crack healer of claim 1, wherein the glue powder comprises VAE glue powder.
9. The fracture healer according to claim 1, wherein the thickener comprises at least one of titanium dioxide and kaolin.
10. A method of preparing a fracture healing agent according to any of claims 1 to 9, comprising the steps of:
uniformly mixing polyether polyol, a plasticizer, calcium powder and a thickening agent to obtain a mixed solution;
heating the mixed solution to 70-90 ℃, then adding isocyanate and a catalyst into the mixed solution, and stirring for reacting for 1-3 hours to obtain an intermediate solution;
and cooling the intermediate solution to 25-35 ℃, then adding lignocellulose, rubber powder and a diluting solvent into the intermediate solution, and stirring and reacting for 10-20 min to obtain the crack repairing agent.
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| CN115197671A (en) * | 2022-08-30 | 2022-10-18 | 惠州市佳邦达复合材料有限公司 | Special compound adhesive for polyurethane lines and preparation process thereof |
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