CN110551383A - Reinforced and toughened road rapid repair material and preparation method thereof - Google Patents
Reinforced and toughened road rapid repair material and preparation method thereof Download PDFInfo
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Abstract
The invention provides a reinforced and toughened road rapid repair material and a preparation method thereof, wherein the reinforced and toughened road rapid repair material is prepared from the following raw materials: nonane diamine, urea, polyvinyl alcohol, dipentaerythritol, para-aramid fiber and a defoaming agent. The method comprises the following steps: step one, optimizing polyvinyl alcohol processing characteristics: step two, preparing modified para-aramid fibers: step three, preparing nonane diamine containing modified para-aramid fiber: and step four, preparing the composite modified polyurea. The repair material can greatly shorten the construction operation time and quickly repair the local damage of the pavement; meanwhile, the material has high strength and flexibility, can ensure the long-term stability of the combination of the material and the original pavement, and can prevent secondary damage in the using process.
Description
Technical Field
The invention belongs to the field of road materials, relates to a road material, and particularly relates to a reinforced and toughened road rapid repair material and a preparation method thereof.
background
Maintenance of road surfaces is one of the important issues facing the field of road engineering today. According to statistics, the annual expenditure for highway maintenance and repair in China in recent years is over 300 billion yuan. With the gradual improvement of highway traffic networks in China, the maintenance of road surfaces is more and more emphasized. In the prior art, because the emulsified asphalt has fast construction speed and simple process, the emulsified asphalt is generally adopted as a repairing material for local damage of a road surface, such as a Chinese patent 'a rapid repairing method of an asphalt concrete road surface' with an authorization publication number of CN 102505601B. However, in practical applications, the construction speed of the emulsified asphalt repair material is faster than that of the ordinary hot asphalt, but the emulsified asphalt repair material still cannot meet the pavement maintenance requirement which is in a more severe situation at present. In addition, the strength and impact resistance of the emulsified asphalt repairing material are poor, and the emulsified asphalt repairing material is easy to separate from the original pavement under the continuous action of vehicle load to form secondary damage.
disclosure of Invention
Aiming at the defects and defects of the prior art, the invention aims to provide a reinforced and toughened road rapid repair material and a preparation method thereof, so that the rapid repair of local damage of a road surface is realized, and the defects of low construction speed and poor durability of the conventional emulsified asphalt repair material are overcome.
In order to solve the technical problems, the invention adopts the following technical scheme:
A reinforced and toughened road rapid repair material is prepared from the following raw materials: nonane diamine, urea, polyvinyl alcohol, dipentaerythritol, para-aramid fiber and a defoaming agent.
The invention also has the following technical characteristics:
the number average molecular weight of the polyvinyl alcohol is 10-12 ten thousand.
The para-aramid fiber is poly (p-phenylene terephthalamide) with the polymerization degree of 300-500.
The para-aramid fiber is a chopped fiber with the length of 2-4 mm and the diameter of 10-15 mu m.
the nonane diamine is nonane diamine or 2-methyl-1, 8-octanediamine;
The defoaming agent is polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropylene amine ether, polyoxypropylene glycerol ether or polyoxypropylene polyoxyethylene glycerol ether.
Specifically, the feed is prepared from the following raw materials in parts by weight: 100 parts of nonane diamine, 60 parts of urea, 25-30 parts of polyvinyl alcohol, 10-15 parts of dipentaerythritol, 30-40 parts of para-aramid fiber and 3-5 parts of defoaming agent.
Preferably, the feed is prepared from the following raw materials in parts by weight: 100 parts of nonane diamine, 60 parts of urea, 27 parts of polyvinyl alcohol, 10-11 parts of dipentaerythritol, 33-38 parts of para-aramid fiber and 3-4 parts of defoaming agent.
most preferably, the feed is prepared from the following raw materials in parts by weight: 100 parts of nonane diamine, 60 parts of urea, 27 parts of polyvinyl alcohol, 11 parts of dipentaerythritol, 33 parts of para-aramid fiber and 4 parts of defoaming agent.
a preparation method of a reinforced and toughened rapid road repair material adopts the formula of the reinforced and toughened rapid road repair material, and comprises the following steps:
Step one, optimizing polyvinyl alcohol processing characteristics:
Heating the polyvinyl alcohol powder to 235-240 ℃ for melting; then adding dipentaerythritol, stirring at a high speed, stopping heating after stirring is finished, cooling, and continuously stirring at a low speed to prepare modified polyvinyl alcohol powder;
Step two, preparing modified para-aramid fibers:
soaking para-aramid fiber in absolute ethyl alcohol, fully washing with distilled water to remove stains on the surface of the fiber, and drying; meanwhile, adding the modified polyvinyl alcohol powder into distilled water, and stirring until the modified polyvinyl alcohol powder is dissolved in the distilled water to obtain a modified polyvinyl alcohol solution; slowly adding the dried para-aramid fibers into the modified polyvinyl alcohol solution, stirring while adding until the para-aramid fibers are fully soaked in the modified polyvinyl alcohol solution, evaporating water, and drying to prepare modified para-aramid fibers with the surfaces covered with the modified polyvinyl alcohol;
Step three, preparing nonane diamine containing modified para-aramid fiber:
Heating nonane diamine to 40 ℃, adding the modified para-aramid fiber into the nonane diamine, stirring while adding until the modified para-aramid fiber is dispersed in the nonane diamine, and ultrasonically dispersing to uniformly disperse the modified para-aramid fiber in a nonane diamine solution to prepare the nonane diamine containing the modified para-aramid fiber;
Step four, preparing the composite modified polyurea:
And D, adding urea and a defoaming agent into the nonane diamine containing the modified para-aramid fibers prepared in the step three, heating to 140-145 ℃, adding and stirring simultaneously to uniformly mix the urea and the nonane diamine, and fully reacting to finally prepare the composite modified polyurea, namely the reinforced and toughened road rapid repair material.
In the first step, the high-speed stirring is to stir the mixture by adopting a high-speed shearing machine, wherein the stirring speed is 2000r/min, and the stirring time is 10 min; the stirring speed of the low-speed stirring is reduced to 500 r/min.
And in the second step, soaking the para-aramid fiber in absolute ethyl alcohol for 2 hours.
In the third step, the ultrasonic dispersion process is ultrasonic dispersion for 30min by an ultrasonic dispersion machine.
Compared with the prior art, the invention has the following technical effects:
The repair material can greatly shorten the construction operation time and quickly repair the local damage of the pavement; meanwhile, the material has high strength and flexibility, can ensure the long-term stability of the combination of the material and the original pavement, and can prevent secondary damage in the using process.
The invention adopts the polyvinyl alcohol and the para-aramid fiber to be simultaneously used for the modified polyurea material for the first time, and prepares the road repairing material with rapid curing, high strength, high toughness and impact resistance for the first time. The repair material disclosed by the invention has excellent performances of high curing speed, high strength, good durability and the like, can be applied to the positions with diseases such as pits and cracks on a pavement or a bridge deck, can realize quick repair of local damage, and overcomes the defects of low construction speed and poor durability of the conventional emulsified asphalt repair material.
(III) the polyvinyl alcohol used in the invention is modified by dipentaerythritol. The invention blends dipentaerythritol and polyvinyl alcohol, effectively reduces the melting point of the polyvinyl alcohol, improves the processing fluidity of the polyvinyl alcohol, and leads the polyvinyl alcohol to be easily wrapped on the surface of the para-aramid fiber, thereby further improving the flexibility and the strength of the para-aramid fiber.
(IV) when the para-aramid fiber is used for optimizing polyurea, the para-aramid fiber is treated by an ultrasonic dispersion machine, so that on one hand, impurities on the surface of the para-aramid fiber can be completely removed, on the other hand, the para-aramid fiber can be uniformly dispersed in a nonanediamine solution, and then when urea and nonanediamine react quickly to generate polyurea, the para-aramid fiber can be quickly cured in the polyurea. Because the para-aramid fibers are in the form of chopped fibers, when the polyurea is rapidly cured, the uniformly dispersed para-aramid fibers can form a tightly connected network pattern in the polyurea material, thereby improving the strength and flexibility of the polyurea in both structural and material characteristics.
The present invention will be explained in further detail with reference to examples.
Detailed Description
The following embodiments of the present invention are provided, and it should be noted that the present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present invention are within the protection scope of the present invention.
Example 1:
the embodiment provides a reinforced and toughened road rapid repair material which is prepared from the following raw materials in parts by weight: 100 parts of nonane diamine, 60 parts of urea, 27 parts of polyvinyl alcohol, 11 parts of dipentaerythritol, 33 parts of para-aramid fiber and 4 parts of defoaming agent.
In this embodiment:
The number average molecular weight of the polyvinyl alcohol is 10-12 ten thousand.
The para-aramid fiber is poly (p-phenylene terephthalamide) with the polymerization degree of 300-500.
the para-aramid fiber is a chopped fiber with the length of 2-4 mm and the diameter of 10-15 mu m.
The nonane diamine is nonane diamine or 2-methyl-1, 8-octanediamine;
the defoaming agent is polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropylene amine ether, polyoxypropylene glycerol ether or polyoxypropylene polyoxyethylene glycerol ether. The polymerization degree of the defoaming agent is the conventional polymerization degree of these substances when used as a defoaming agent.
The embodiment also provides a preparation method of the reinforced and toughened road rapid repair material, which adopts the formula of the reinforced and toughened road rapid repair material, and comprises the following steps:
step one, optimizing polyvinyl alcohol processing characteristics:
Heating the polyvinyl alcohol powder to 235-240 ℃ for melting; then adding dipentaerythritol, stirring at a high speed, stopping heating after stirring is finished, cooling, and continuously stirring at a low speed to prepare modified polyvinyl alcohol powder;
Step two, preparing modified para-aramid fibers:
Soaking para-aramid fiber in absolute ethyl alcohol, fully washing with distilled water to remove stains on the surface of the fiber, and drying; meanwhile, adding the modified polyvinyl alcohol powder into distilled water, and stirring until the modified polyvinyl alcohol powder is dissolved in the distilled water to obtain a modified polyvinyl alcohol solution; slowly adding the dried para-aramid fibers into the modified polyvinyl alcohol solution, stirring while adding until the para-aramid fibers are fully soaked in the modified polyvinyl alcohol solution, evaporating water, and drying to prepare modified para-aramid fibers with the surfaces covered with the modified polyvinyl alcohol;
Step three, preparing nonane diamine containing modified para-aramid fiber:
heating nonane diamine to 40 ℃, adding the modified para-aramid fiber into the nonane diamine, stirring while adding until the modified para-aramid fiber is dispersed in the nonane diamine, and ultrasonically dispersing to uniformly disperse the modified para-aramid fiber in a nonane diamine solution to prepare the nonane diamine containing the modified para-aramid fiber;
Step four, preparing the composite modified polyurea:
and D, adding urea and a defoaming agent into the nonane diamine containing the modified para-aramid fibers prepared in the step three, heating to 140-145 ℃, adding and stirring simultaneously to uniformly mix the urea and the nonane diamine, and fully reacting to finally prepare the composite modified polyurea, namely the reinforced and toughened road rapid repair material.
The preparation method comprises the following steps:
In the first step, the high-speed stirring is to stir the mixture by adopting a high-speed shearing machine, wherein the stirring speed is 2000r/min, and the stirring time is 10 min; the stirring speed of the low-speed stirring is reduced to 500 r/min.
And in the second step, soaking the para-aramid fiber in absolute ethyl alcohol for 2 hours.
in the third step, the ultrasonic dispersion process is ultrasonic dispersion for 30min by an ultrasonic dispersion machine.
Example 2:
The embodiment provides a reinforced and toughened road rapid repair material which is prepared from the following raw materials in parts by weight: 100 parts of nonane diamine, 60 parts of urea, 26 parts of polyvinyl alcohol, 12 parts of dipentaerythritol, 40 parts of para-aramid fiber and 5 parts of defoaming agent.
The selection and specification requirements of the raw materials in this example are the same as those in example 1.
The embodiment also provides a preparation method of the reinforced and toughened rapid road repair material, which is the same as the preparation method of the reinforced and toughened rapid road repair material in the embodiment 1.
example 3:
The embodiment provides a reinforced and toughened road rapid repair material which is prepared from the following raw materials in parts by weight: 100 parts of nonane diamine, 60 parts of urea, 25 parts of polyvinyl alcohol, 15 parts of dipentaerythritol, 30 parts of para-aramid fiber and 4 parts of defoaming agent.
The selection and specification requirements of the raw materials in this example are the same as those in example 1.
the embodiment also provides a preparation method of the reinforced and toughened rapid road repair material, which is the same as the preparation method of the reinforced and toughened rapid road repair material in the embodiment 1.
example 4:
The embodiment provides a reinforced and toughened road rapid repair material which is prepared from the following raw materials in parts by weight: 100 parts of nonane diamine, 60 parts of urea, 28 parts of polyvinyl alcohol, 11 parts of dipentaerythritol, 36 parts of para-aramid fiber and 3 parts of defoaming agent.
the selection and specification requirements of the raw materials in this example are the same as those in example 1.
The embodiment also provides a preparation method of the reinforced and toughened rapid road repair material, which is the same as the preparation method of the reinforced and toughened rapid road repair material in the embodiment 1.
Example 5:
The embodiment provides a reinforced and toughened road rapid repair material which is prepared from the following raw materials in parts by weight: 100 parts of nonane diamine, 60 parts of urea, 29 parts of polyvinyl alcohol, 12 parts of dipentaerythritol, 32 parts of para-aramid fiber and 4 parts of defoaming agent.
The selection and specification requirements of the raw materials in this example are the same as those in example 1.
The embodiment also provides a preparation method of the reinforced and toughened rapid road repair material, which is the same as the preparation method of the reinforced and toughened rapid road repair material in the embodiment 1.
Example 6:
The embodiment provides a reinforced and toughened road rapid repair material which is prepared from the following raw materials in parts by weight: 100 parts of nonane diamine, 60 parts of urea, 30 parts of polyvinyl alcohol, 13 parts of dipentaerythritol, 35 parts of para-aramid fiber and 5 parts of defoaming agent.
The selection and specification requirements of the raw materials in this example are the same as those in example 1.
The embodiment also provides a preparation method of the reinforced and toughened rapid road repair material, which is the same as the preparation method of the reinforced and toughened rapid road repair material in the embodiment 1.
example 7:
the embodiment provides a reinforced and toughened road rapid repair material which is prepared from the following raw materials in parts by weight: 100 parts of nonane diamine, 60 parts of urea, 27 parts of polyvinyl alcohol, 10 parts of dipentaerythritol, 38 parts of para-aramid fiber and 3 parts of defoaming agent.
The selection and specification requirements of the raw materials in this example are the same as those in example 1.
The embodiment also provides a preparation method of the reinforced and toughened rapid road repair material, which is the same as the preparation method of the reinforced and toughened rapid road repair material in the embodiment 1.
example 8:
the embodiment provides a reinforced and toughened road rapid repair material which is prepared from the following raw materials in parts by weight: 100 parts of nonane diamine, 60 parts of urea, 28 parts of polyvinyl alcohol, 14 parts of dipentaerythritol, 34 parts of para-aramid fiber and 4 parts of defoaming agent.
The selection and specification requirements of the raw materials in this example are the same as those in example 1.
The embodiment also provides a preparation method of the reinforced and toughened rapid road repair material, which is the same as the preparation method of the reinforced and toughened rapid road repair material in the embodiment 1.
comparative example 1:
This comparative example, which differs from example 1 in that only two components of defoamer and polyurea: nonane diamine and urea, no other substance is added, namely nonane diamine and carbamide are directly reacted to synthesize polyurea, and polyvinyl alcohol and para-aramid fiber are not adopted to carry out composite modification on the polyurea.
The comparative example is prepared from the following raw materials in parts by weight: 100 parts of nonane diamine, 60 parts of urea and 4 parts of defoaming agent.
the selection and specification of the raw materials in this comparative example are the same as those in example 1.
The preparation method of the repair material of this comparative example: nonanediamine and urea were both mixed directly.
Comparative example 2:
The comparative example shows a repair material, and is different from the example 1 in that only polyvinyl alcohol is modified and aramid fiber is not modified in the process of synthesizing polyurea from nonane diamine and urea.
the comparative example is prepared from the following raw materials in parts by weight: 100 parts of nonane diamine, 60 parts of urea, 27 parts of polyvinyl alcohol and 4 parts of defoaming agent.
The selection and specification of the raw materials in this comparative example are the same as those in example 1.
the preparation method of the repair material of this comparative example: heating polyvinyl alcohol powder to 235-240 ℃, adding the heated polyvinyl alcohol powder into nonane diamine solution, and then reacting nonane diamine with urea to generate polyurea.
Comparative example 3:
the comparative example shows a repair material, and is different from the example 1 in that only polyvinyl alcohol is modified and aramid fiber is not modified in the process of synthesizing polyurea from nonane diamine and urea. The polyvinyl alcohol is modified polyvinyl alcohol optimized by dipentaerythritol.
The comparative example is prepared from the following raw materials in parts by weight: 100 parts of nonane diamine, 60 parts of urea, 27 parts of polyvinyl alcohol, 11 parts of dipentaerythritol and 4 parts of defoaming agent.
The selection and specification of the raw materials in this comparative example are the same as those in example 1.
The comparative example provides a repair material, and is different from the example 1 in that polyurea is modified by using the dipentaerythritol-modified polyvinyl alcohol, namely, the dipentaerythritol-modified polyvinyl alcohol powder is directly heated to 235-240 ℃ and added into the nonane diamine solution, and then the nonane diamine reacts with carbamide to generate polyurea.
A method of preparing the repair material of this comparative example; firstly, the first step of the embodiment 1 is carried out, then the modified polyvinyl alcohol powder prepared in the step 1 is heated to 235-240 ℃ and then added into the nonane diamine solution, and finally the nonane diamine reacts with urea to generate polyurea.
comparative example 4:
The comparative example shows a repair material, and is different from example 1 in that only para-aramid fiber is modified in the process of synthesizing polyurea from nonane diamine and urea. The para-aramid fiber is common para-aramid fiber and is not optimized by polyvinyl alcohol.
The comparative example is prepared from the following raw materials in parts by weight: 100 parts of nonane diamine, 60 parts of urea, 33 parts of para-aramid fiber and 4 parts of defoaming agent.
The selection and specification of the raw materials in this comparative example are the same as those in example 1.
the preparation method of the repair material of this comparative example: only the third step and the fourth step in example 1 are carried out, but common para-aramid fiber is adopted in the third step, and modified para-aramid fiber optimized by polyvinyl alcohol is not adopted.
comparative example 5:
The comparative example shows a repair material, and is different from example 1 in that only para-aramid fiber is modified in the process of synthesizing polyurea from nonane diamine and urea. The para-aramid fiber is modified para-aramid fiber and is optimized by polyvinyl alcohol.
the comparative example is prepared from the following raw materials in parts by weight: 100 parts of nonane diamine, 60 parts of urea, 33 parts of para-aramid fiber, 27 parts of polyvinyl alcohol and 4 parts of defoaming agent.
the selection and specification of the raw materials in this comparative example are the same as those in example 1.
the preparation method of the repair material of this comparative example: only the second, third and fourth steps in example 1 were performed, but ordinary polyvinyl alcohol powder was used in the second step, not modified polyvinyl alcohol powder optimized with dipentaerythritol.
Comparative example 6:
The comparative example shows a repair material, and is different from the example 1 in that only polyvinyl alcohol is modified and aramid fiber is not modified in the process of synthesizing polyurea from nonane diamine and urea. The polyvinyl alcohol is modified polyvinyl alcohol powder optimized by dipentaerythritol, and the quality of the polyvinyl alcohol is enlarged.
The comparative example is prepared from the following raw materials in parts by weight: 100 parts of nonane diamine, 60 parts of urea, 60 parts of polyvinyl alcohol, 11 parts of dipentaerythritol, 33 parts of para-aramid fiber and 4 parts of defoaming agent.
The selection and specification of the raw materials in this comparative example are the same as those in example 1.
The repair material of this comparative example was prepared in the same manner as in comparative example 3.
Comparative example 7:
The comparative example shows a repair material, which is different from example 1 in that it shows a repair material, and is different from example 1 in that only para-aramid fiber is modified in the process of synthesizing polyurea from nonanediamine and urea. The para-aramid fiber is not optimized by polyvinyl alcohol, is common para-aramid fiber and has enlarged quality.
The comparative example is prepared from the following raw materials in parts by weight: 100 parts of nonane diamine, 60 parts of urea, 33 parts of para-aramid fiber and 4 parts of defoaming agent.
the selection and specification of the raw materials in this comparative example are the same as those in example 1.
The repair material of this comparative example was prepared in the same manner as in example 4.
And (3) performance test results:
in order to verify the relevant performance of the reinforced and toughened rapid road repair material, according to the 2 nd part of the rapid repair material for the highway engineering cement concrete: the results of the basic performance tests and the indoor simulation tests of tensile strength at room temperature (25 ℃), elongation at break, shear resistance, pull-out resistance, and impact strength at room temperature (25 ℃) on the repair materials prepared in the examples and comparative examples are shown in Table 1.
TABLE 1 Performance test results of examples and comparative examples
From table 1, it can be seen that:
(1) By analyzing the indexes of the examples 1-8 and the comparative example 1, the strength and toughness of the polyurea can be improved by the polyvinyl alcohol and the para-aramid fiber compared with the polyurea which is not subjected to modification treatment; with the increase of polyvinyl alcohol and para-aramid fiber, the strength indexes of the repair material, such as the drawing strength, the shear strength, the impact strength and the like, and the flexibility indexes, such as the tensile strength, the breaking elongation and the like, are gradually increased, and the gelation time is gradually increased.
(2) by analyzing the indexes of the comparative examples 4, 5 and 7, the para-aramid fiber can be found to improve the strength and toughness of the polyurea better than the polyurea without modification treatment, but mainly focuses on the improvement of the flexibility and interlayer bonding performance of the material. On the basis, compared with the examples 1 to 8, the para-aramid fiber is stronger than the polyvinyl alcohol in the aspect of improving the toughness of the para-polyurea, but the gelation time is greatly increased, because the para-aramid fiber is added into the polyurea in the form of chopped fiber, compared with the polyvinyl alcohol liquid form, the para-aramid fiber has small specific surface area and is in contact with the solution and has relatively longer reaction time.
(3) By analyzing the indexes of the comparative examples 1-3 and 6, the polyvinyl alcohol can better improve the strength and toughness of the polyurea compared with the polyurea which is not subjected to modification treatment. On the basis, compared with the comparative example 5 and the examples 1 to 8, the improvement effect of the polyvinyl alcohol on the polyurea performance is found to be poor compared with that of the para-aramid fiber, but if the polyvinyl alcohol modified by dipentaerythritol is adopted, the strength and toughness of the modified polyurea are further obviously enhanced, which shows that the processing characteristics such as the fluidity of the polyvinyl alcohol are important factors for restricting the performance of the polyvinyl alcohol after the polyvinyl alcohol is added into the polyurea.
(4) Comparing the indexes of examples 1-8 and comparative examples 1-7, it can be found that the performance of the example 1 is the best and excellent by combining the performance indexes, and the best raw material composition is as follows: 100 parts of nonane diamine, 60 parts of carbamide, 27 parts of polyvinyl alcohol, 11 parts of dipentaerythritol, 33 parts of para-aramid fiber and 4 parts of defoaming agent.
Claims (10)
1. A reinforced and toughened road rapid repair material is characterized by being prepared from the following raw materials: nonane diamine, urea, polyvinyl alcohol, dipentaerythritol, para-aramid fiber and a defoaming agent.
2. The reinforcing and toughening rapid road repair material of claim 1, wherein the polyvinyl alcohol has a number average molecular weight of 10 to 12 ten thousand.
3. the reinforced and toughened rapid road repair material as claimed in claim 1, wherein the para-aramid fiber is poly (p-phenylene terephthalamide) having a degree of polymerization of 300 to 500.
4. The reinforced and toughened road rapid repair material as claimed in claim 1, wherein the para-aramid fiber is a chopped fiber having a length of 2 to 4mm and a diameter of 10 to 15 μm.
5. The reinforcing and toughening rapid road repair material of claim 1, wherein the nonanediamine is nonanediamine or 2-methyl-1, 8-octanediamine;
The defoaming agent is polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropylene amine ether, polyoxypropylene glycerol ether or polyoxypropylene polyoxyethylene glycerol ether.
6. the reinforced and toughened road rapid repair material as claimed in claim 1, wherein the reinforced and toughened road rapid repair material is prepared from the following raw materials in parts by weight: 100 parts of nonane diamine, 60 parts of urea, 25-30 parts of polyvinyl alcohol, 10-15 parts of dipentaerythritol, 30-40 parts of para-aramid fiber and 3-5 parts of defoaming agent.
7. The reinforced and toughened road rapid repair material as claimed in claim 6, wherein the material is prepared from the following raw materials in parts by weight: 100 parts of nonane diamine, 60 parts of urea, 27 parts of polyvinyl alcohol, 10-11 parts of dipentaerythritol, 33-38 parts of para-aramid fiber and 3-4 parts of defoaming agent.
8. the reinforced and toughened road rapid repair material as claimed in claim 7, wherein the material is prepared from the following raw materials in parts by weight: 100 parts of nonane diamine, 60 parts of urea, 27 parts of polyvinyl alcohol, 11 parts of dipentaerythritol, 33 parts of para-aramid fiber and 4 parts of defoaming agent.
9. a method for preparing a reinforced and toughened rapid road repair material, which is characterized by adopting the formula of the reinforced and toughened rapid road repair material as claimed in any one of claims 1 to 8, and comprises the following steps:
Step one, optimizing polyvinyl alcohol processing characteristics:
Heating the polyvinyl alcohol powder to 235-240 ℃ for melting; then adding dipentaerythritol, stirring at a high speed, stopping heating after stirring is finished, cooling, and continuously stirring at a low speed to prepare modified polyvinyl alcohol powder;
Step two, preparing modified para-aramid fibers:
Soaking para-aramid fiber in absolute ethyl alcohol, fully washing with distilled water to remove stains on the surface of the fiber, and drying; meanwhile, adding the modified polyvinyl alcohol powder into distilled water, and stirring until the modified polyvinyl alcohol powder is dissolved in the distilled water to obtain a modified polyvinyl alcohol solution; slowly adding the dried para-aramid fibers into the modified polyvinyl alcohol solution, stirring while adding until the para-aramid fibers are fully soaked in the modified polyvinyl alcohol solution, evaporating water, and drying to prepare modified para-aramid fibers with the surfaces covered with the modified polyvinyl alcohol;
Step three, preparing nonane diamine containing modified para-aramid fiber:
Heating nonane diamine to 40 ℃, adding the modified para-aramid fiber into the nonane diamine, stirring while adding until the modified para-aramid fiber is dispersed in the nonane diamine, and ultrasonically dispersing to uniformly disperse the modified para-aramid fiber in a nonane diamine solution to prepare the nonane diamine containing the modified para-aramid fiber;
Step four, preparing the composite modified polyurea:
and D, adding urea and a defoaming agent into the nonane diamine containing the modified para-aramid fibers prepared in the step three, heating to 140-145 ℃, adding and stirring simultaneously to uniformly mix the urea and the nonane diamine, and fully reacting to finally prepare the composite modified polyurea, namely the reinforced and toughened road rapid repair material.
10. The method for preparing the reinforced and toughened road rapid repair material as claimed in claim 9, wherein:
In the first step, the high-speed stirring is to stir the mixture by adopting a high-speed shearing machine, wherein the stirring speed is 2000r/min, and the stirring time is 10 min; the stirring speed of the low-speed stirring is reduced to 500 r/min.
And in the second step, soaking the para-aramid fiber in absolute ethyl alcohol for 2 hours.
In the third step, the ultrasonic dispersion process is ultrasonic dispersion for 30min by an ultrasonic dispersion machine.
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