CN110423452B - High-strength durable rapid repair material for roads and preparation method thereof - Google Patents
High-strength durable rapid repair material for roads and preparation method thereof Download PDFInfo
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Abstract
The invention provides a high-strength durable rapid repair material for roads and a preparation method thereof, wherein the material is prepared from the following raw materials: polyaspartic acid ester, diisocyanate, ultra-high molecular weight polyethylene, low molecular weight polyethylene, heterocyclic aramid fiber, a cross-linking agent, a silane coupling agent and a defoaming agent. The method comprises the following steps: step one, optimizing the processing characteristics of the ultra-high molecular weight polyethylene: step two, preparing active polyethylene composite powder: step three, preparing polyaspartic ester-polyethylene composite powder: step four, preparing the modified heterocyclic aramid fiber: and step five, 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 high-strength durable rapid repair material for roads 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 shortcomings of the prior art, the invention aims to provide a high-strength durable rapid repair material for roads and a preparation method thereof, and solves the technical problems that the construction operation time of the repair material in the prior art is still long, and the pavement maintenance requirement which is in a more severe situation at present is difficult to meet.
In order to solve the technical problems, the invention adopts the following technical scheme:
a high-strength durable rapid repair material for roads is prepared from the following raw materials: polyaspartic acid ester, diisocyanate, ultra-high molecular weight polyethylene, low molecular weight polyethylene, heterocyclic aramid fiber, a cross-linking agent, a silane coupling agent and a defoaming agent.
The invention also has the following technical characteristics:
the number average molecular weight of the ultra-high molecular weight polyethylene is 150-200 ten thousand; the number average molecular weight of the low molecular weight polyethylene is 1000-5000.
The molecular formula of the heterocyclic aramid fiber is as follows:
the polymerization degree is 300 to 500.
The heterocyclic aramid fiber is a chopped fiber with the length of 2-4 mm and the diameter of 10-15 mu m.
The polymerization degree of the polyaspartic ester is 200-400;
the diisocyanate is more than one of toluene diisocyanate, diphenylmethane diisocyanate and hexamethylene diisocyanate;
the cross-linking agent is 2, 5-dimethyl-2, 5-di-tert-butyl peroxy hexyne-3 or dicumyl peroxide;
the silane coupling agent is vinyl trimethoxy silane, vinyl triethoxy silane or allyl siloxane;
the defoaming agent is emulsified silicone oil.
Specifically, the feed is prepared from the following raw materials in parts by weight: 100 parts of polyaspartic acid ester, 55 parts of diisocyanate, 35-40 parts of ultra-high molecular weight polyethylene, 8-12 parts of low molecular weight polyethylene, 52-60 parts of heterocyclic aramid fiber, 4-8 parts of cross-linking agent, 50-55 parts of silane coupling agent and 6-10 parts of defoaming agent.
Preferably, the feed is prepared from the following raw materials in parts by weight: 100 parts of polyaspartic acid ester, 55 parts of diisocyanate, 36-38 parts of ultra-high molecular weight polyethylene, 10-12 parts of low molecular weight polyethylene, 56-60 parts of heterocyclic aramid fiber, 6-7 parts of a cross-linking agent, 52-54 parts of a silane coupling agent and 6-10 parts of a defoaming agent.
Most preferably, the feed is prepared from the following raw materials in parts by weight: 100 parts of polyaspartic acid ester, 55 parts of diisocyanate, 36 parts of ultra-high molecular weight polyethylene, 10 parts of low molecular weight polyethylene, 56 parts of heterocyclic aramid fiber, 6 parts of a cross-linking agent, 52 parts of a silane coupling agent and 8 parts of a defoaming agent.
The invention also provides a preparation method of the high-strength durable quick repair material for the road, which adopts the formula of the high-strength durable quick repair material for the road, and comprises the following steps:
step one, optimizing the processing characteristics of the ultra-high molecular weight polyethylene:
carrying out physical melting and blending on the ultra-high molecular weight polyethylene and the low molecular weight polyethylene, heating at 240-245 ℃ for a short time, and then cooling and rolling into powdery solid to prepare polyethylene composite powder;
step two, preparing active polyethylene composite powder:
dissolving a cross-linking agent by absolute ethyl alcohol, adding polyethylene composite powder into the absolute ethyl alcohol containing the cross-linking agent, heating to 65-70 ℃ while stirring, performing ultrasonic dispersion and uniform mixing, volatilizing the absolute ethyl alcohol, and drying to obtain active polyethylene composite powder containing the cross-linking agent;
step three, preparing polyaspartic ester-polyethylene composite powder:
uniformly dispersing polyaspartic ester with one third of formula proportion in absolute ethyl alcohol under stirring, and then adding active polyethylene composite powder to prepare suspension; adding the suspension into a ball milling tank of a ball mill, performing ball milling, volatilizing absolute ethyl alcohol after the ball milling is finished, and drying to obtain polyaspartic ester-polyethylene composite powder;
step four, preparing the modified heterocyclic aramid fiber:
soaking the heterocyclic aramid fiber in absolute ethyl alcohol for 2 hours, washing with distilled water to remove stains on the surface of the fiber, and drying; adding the dried heterocyclic aramid fiber into diisocyanate, and then performing ultrasonic dispersion to uniformly disperse the heterocyclic aramid fiber in the diisocyanate to prepare modified heterocyclic aramid fiber;
step five, preparing the composite modified polyurea:
sequentially adding the polyaspartic ester-polyethylene composite powder prepared in the step three and a silane coupling agent into the remaining two thirds of the polyaspartic ester in the formula ratio, and stirring the mixture by using a glass rod while adding the mixture until the mixture is uniformly dispersed; and heating and maintaining the temperature of the solution at 75-80 ℃, adding the modified heterocyclic aramid fiber prepared in the fourth step and a defoaming agent, and fully reacting to finally prepare the composite modified polyurea, namely the high-strength durable quick repair material for roads.
In the first step, the short-term heating time is 15-20 min;
in the second step, the mixture is heated to 65-70 ℃ and then continuously stirred for 5 min; the ultrasonic dispersion process is ultrasonic dispersion for 30min by an ultrasonic dispersion machine;
in the third step, zirconia balls are put into the ball milling process according to the ball material mass ratio of 4: 1;
in the fourth 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 ultra-high molecular weight polyethylene and heterocyclic aramid fiber to be simultaneously used for the modified polyurea material for the first time, and prepares the road repair 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.
When the invention uses the ultra-high molecular weight polyethylene to optimize the polyurea, the invention realizes the optimization process of 'melt blending-excitation activity-crosslinking curing' by adopting the low molecular weight polyethylene, the crosslinking agent and the silane coupling agent in sequence, which is different from the complex technologies of radiation, surface gas phase treatment and the like adopted by others. The method comprises the following specific steps:
firstly, because the ultra-high molecular weight polyethylene has poor fluidity and processability, the low molecular weight polyethylene with low melting point and low viscosity and the ultra-high molecular weight polyethylene are adopted for melt blending, so that the processing characteristics of the ultra-high molecular weight polyethylene are improved, and the ultra-high molecular weight polyethylene can be better rolled into a powder material and then added into the polyaspartic acid ester.
Secondly, 2, 5-dimethyl-2, 5-di-tert-butyl peroxy hexyne-3 or dicumyl peroxide is adopted as a cross-linking agent, the cross-linking agent is heated and decomposed into free radicals with very high chemical activity, the free radicals can capture hydrogen atoms in the ultra-high molecular weight polyethylene molecules, the main chain of the ultra-high molecular weight polyethylene molecules is changed into active free radicals, and thus the activity of the ultra-high molecular weight polyethylene is excited, and the active ultra-high molecular weight polyethylene is prepared.
And finally, mixing the polyaspartic acid ester solution containing the active ultrahigh molecular weight polyethylene with a silane coupling agent and a diisocyanate solution. Polyaspartates can react rapidly with diisocyanates to form polyureas. Meanwhile, the main chain of the active ultrahigh molecular weight polyethylene molecule contains active free radicals, and can be subjected to grafting and hydrolytic condensation reactions with silane in sequence to generate silane cross-linked ultrahigh molecular weight polyethylene. Since these two reactions proceed simultaneously, the silane-crosslinked ultra-high molecular weight polyethylene will be completely and uniformly cured in the polyurea, improving the impact strength of the polyurea.
(IV) when the invention uses the heterocyclic aramid fiber to optimize the polyurea, the invention uses the ultrasonic dispersion machine to treat the heterocyclic aramid fiber, on one hand, the surface impurities of the heterocyclic aramid fiber can be removed completely, on the other hand, the heterocyclic aramid fiber can be uniformly dispersed in the diisocyanate solution, and then when the polyaspartic ester and the diisocyanate react rapidly to generate the polyurea, the heterocyclic aramid fiber can be rapidly cured in the polyurea. Because the heterocyclic aramid fibers are present as chopped fibers, when the polyurea is rapidly cured, the uniformly dispersed heterocyclic aramid fibers are capable of forming a tightly connected network pattern in the polyurea material, thereby improving the strength and flexibility of the polyurea both in terms of structural and material properties.
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 high-strength durable quick-repair material for roads, which is prepared from the following raw materials in parts by weight: 100 parts of polyaspartic acid ester, 55 parts of diisocyanate, 36 parts of ultra-high molecular weight polyethylene, 10 parts of low molecular weight polyethylene, 56 parts of heterocyclic aramid fiber, 6 parts of a cross-linking agent, 52 parts of a silane coupling agent and 8 parts of a defoaming agent.
In this embodiment:
the number average molecular weight of the ultra-high molecular weight polyethylene (UHMW-PE) is 150-200 ten thousand; the low molecular weight polyethylene (LMPE) has a number average molecular weight of 1000 to 5000.
The molecular formula of the heterocyclic aramid fiber is as follows:
the polymerization degree is 300 to 500. The heterocyclic aramid fiber is a chopped fiber with the length of 2-4 mm and the diameter of 10-15 mu m.
The polymerization degree of the polyaspartic ester is 200-400;
the diisocyanate is a combination of one or more of tolylene diisocyanate, diphenylmethane diisocyanate, and hexamethylene diisocyanate, and tolylene diisocyanate is particularly preferable in this embodiment.
The cross-linking agent is 2, 5-dimethyl-2, 5-di-tert-butyl peroxy hexyne-3 or dicumyl peroxide;
the silane coupling agent is vinyl trimethoxy silane, vinyl triethoxy silane or allyl siloxane;
the defoaming agent is emulsified silicone oil.
The embodiment also provides a preparation method of the high-strength durable rapid repair material for roads, which comprises the following steps:
step one, optimizing the processing characteristics of the ultra-high molecular weight polyethylene:
carrying out physical melting and blending on the ultra-high molecular weight polyethylene and the low molecular weight polyethylene, heating at 240-245 ℃ for a short time, and then cooling and rolling into powdery solid to prepare polyethylene composite powder;
step two, preparing active polyethylene composite powder:
dissolving a cross-linking agent by absolute ethyl alcohol, adding polyethylene composite powder into the absolute ethyl alcohol containing the cross-linking agent, heating to 65-70 ℃ while stirring, performing ultrasonic dispersion and uniform mixing, volatilizing the absolute ethyl alcohol, and drying to obtain active polyethylene composite powder containing the cross-linking agent;
step three, preparing polyaspartic ester-polyethylene composite powder:
uniformly dispersing polyaspartic ester with one third of formula proportion in absolute ethyl alcohol under stirring, and then adding active polyethylene composite powder to prepare suspension; adding the suspension into a ball milling tank of a ball mill, performing ball milling, volatilizing absolute ethyl alcohol after the ball milling is finished, and drying to obtain polyaspartic ester-polyethylene composite powder;
step four, preparing the modified heterocyclic aramid fiber:
soaking the heterocyclic aramid fiber in absolute ethyl alcohol for 2 hours, washing with distilled water to remove stains on the surface of the fiber, and drying; adding the dried heterocyclic aramid fiber into diisocyanate, and then performing ultrasonic dispersion to uniformly disperse the heterocyclic aramid fiber in the diisocyanate to prepare modified heterocyclic aramid fiber;
step five, preparing the composite modified polyurea:
sequentially adding the polyaspartic ester-polyethylene composite powder prepared in the step three and a silane coupling agent into the remaining two thirds of the polyaspartic ester in the formula ratio, and stirring the mixture by using a glass rod while adding the mixture until the mixture is uniformly dispersed; and heating and maintaining the temperature of the solution at 75-80 ℃, adding the modified heterocyclic aramid fiber prepared in the fourth step and a defoaming agent, and fully reacting to finally prepare the composite modified polyurea, namely the high-strength durable quick repair material for roads.
The preparation method comprises the following steps:
in the first step, the short-term heating time is 15 min-20 min;
in the second step, the mixture is heated to 65-70 ℃ and then continuously stirred for 5 min; the ultrasonic dispersion process is ultrasonic dispersion for 30min by an ultrasonic dispersion machine;
in the third step, zirconia balls are put into the ball milling process according to the ball material mass ratio of 4: 1;
in the fourth step, the ultrasonic dispersion process is ultrasonic dispersion for 30min by an ultrasonic dispersion machine.
Example 2:
the embodiment provides a high-strength durable quick-repair material for roads, which is prepared from the following raw materials in parts by weight: 100 parts of polyaspartic acid ester, 55 parts of diisocyanate, 35 parts of ultrahigh molecular weight polyethylene, 12 parts of low molecular weight polyethylene, 55 parts of heterocyclic aramid fiber, 7 parts of cross-linking agent, 55 parts of silane coupling agent and 8 parts of defoaming agent.
The selection and specification requirements of the raw materials in this example are the same as those in example 1.
This example also shows a method for preparing the above-mentioned high-strength durable quick-repair material for roads, which is the same as the method for preparing the high-strength durable quick-repair material for roads in example 1.
Example 3:
the embodiment provides a high-strength durable quick-repair material for roads, which is prepared from the following raw materials in parts by weight: 100 parts of polyaspartic acid ester, 55 parts of diisocyanate, 37 parts of ultrahigh molecular weight polyethylene, 9 parts of low molecular weight polyethylene, 52 parts of heterocyclic aramid fiber, 5 parts of a cross-linking agent, 53 parts of a silane coupling agent and 8 parts of a defoaming agent.
The selection and specification requirements of the raw materials in this example are the same as those in example 1.
This example also shows a method for preparing the above-mentioned high-strength durable quick-repair material for roads, which is the same as the method for preparing the high-strength durable quick-repair material for roads in example 1.
Example 4:
the embodiment provides a high-strength durable quick-repair material for roads, which is prepared from the following raw materials in parts by weight: 100 parts of polyaspartic acid ester, 55 parts of diisocyanate, 40 parts of ultra-high molecular weight polyethylene, 8 parts of low molecular weight polyethylene, 54 parts of heterocyclic aramid fiber, 5 parts of a cross-linking agent, 52 parts of a silane coupling agent and 10 parts of a defoaming agent.
The selection and specification requirements of the raw materials in this example are the same as those in example 1.
This example also shows a method for preparing the above-mentioned high-strength durable quick-repair material for roads, which is the same as the method for preparing the high-strength durable quick-repair material for roads in example 1.
Example 5:
the embodiment provides a high-strength durable quick-repair material for roads, which is prepared from the following raw materials in parts by weight: 100 parts of polyaspartic acid ester, 55 parts of diisocyanate, 35 parts of ultrahigh molecular weight polyethylene, 10 parts of low molecular weight polyethylene, 60 parts of heterocyclic aramid fiber, 6 parts of cross-linking agent, 51 parts of silane coupling agent and 7 parts of defoaming agent.
The selection and specification requirements of the raw materials in this example are the same as those in example 1.
This example also shows a method for preparing the above-mentioned high-strength durable quick-repair material for roads, which is the same as the method for preparing the high-strength durable quick-repair material for roads in example 1.
Example 6:
the embodiment provides a high-strength durable quick-repair material for roads, which is prepared from the following raw materials in parts by weight: 100 parts of polyaspartic acid ester, 55 parts of diisocyanate, 38 parts of ultra-high molecular weight polyethylene, 11 parts of low molecular weight polyethylene, 60 parts of heterocyclic aramid fiber, 7 parts of cross-linking agent, 54 parts of silane coupling agent and 6 parts of defoaming agent.
The selection and specification requirements of the raw materials in this example are the same as those in example 1.
This example also shows a method for preparing the above-mentioned high-strength durable quick-repair material for roads, which is the same as the method for preparing the high-strength durable quick-repair material for roads in example 1.
Example 7:
the embodiment provides a high-strength durable quick-repair material for roads, which is prepared from the following raw materials in parts by weight: 100 parts of polyaspartic acid ester, 55 parts of diisocyanate, 36 parts of ultra-high molecular weight polyethylene, 12 parts of low molecular weight polyethylene, 57 parts of heterocyclic aramid fiber, 6 parts of a cross-linking agent, 53 parts of a silane coupling agent and 10 parts of a defoaming agent.
The selection and specification requirements of the raw materials in this example are the same as those in example 1.
This example also shows a method for preparing the above-mentioned high-strength durable quick-repair material for roads, which is the same as the method for preparing the high-strength durable quick-repair material for roads in example 1.
Example 8:
the embodiment provides a high-strength durable quick-repair material for roads, which is prepared from the following raw materials in parts by weight: 100 parts of polyaspartic acid ester, 55 parts of diisocyanate, 39 parts of ultra-high molecular weight polyethylene, 10 parts of low molecular weight polyethylene, 58 parts of heterocyclic aramid fiber, 4 parts of cross-linking agent, 55 parts of silane coupling agent and 7 parts of defoaming agent.
The selection and specification requirements of the raw materials in this example are the same as those in example 1.
This example also shows a method for preparing the above-mentioned high-strength durable quick-repair material for roads, which is the same as the method for preparing the high-strength durable quick-repair material for roads in example 1.
Example 9:
the embodiment provides a high-strength durable quick-repair material for roads, which is prepared from the following raw materials in parts by weight: 100 parts of polyaspartic acid ester, 55 parts of diisocyanate, 37 parts of ultra-high molecular weight polyethylene, 11 parts of low molecular weight polyethylene, 54 parts of heterocyclic aramid fiber, 8 parts of cross-linking agent, 50 parts of silane coupling agent and 6 parts of defoaming agent.
The selection and specification requirements of the raw materials in this example are the same as those in example 1.
This example also shows a method for preparing the above-mentioned high-strength durable quick-repair material for roads, which is the same as the method for preparing the high-strength durable quick-repair material for roads in example 1.
Comparative example 1:
the comparative example shows a repair material, and is different from the example 1 in that only the defoaming agent, the polyaspartic ester and the diisocyanate are added, and other substances are not added, namely, the polyaspartic ester and the diisocyanate are directly reacted to synthesize polyurea, and the composite modification of the ultrahigh molecular weight polyethylene and the heterocyclic aramid fiber is not carried out.
The comparative example is prepared from the following raw materials in parts by weight: 100 parts of polyaspartic ester, 55 parts of diisocyanate and 8 parts of defoaming agent.
The selection and specification of the raw materials in this example were the same as in example 1.
The preparation method of the repair material of this comparative example: both the polyaspartate and the diisocyanate are mixed directly.
Comparative example 2:
the comparative example shows a repair material, which is different from example 1 in that only the heterocyclic aramid fiber is modified and not the ultra-high molecular weight polyethylene is modified during the synthesis of polyurea from polyaspartic ester and diisocyanate.
The comparative example is prepared from the following raw materials in parts by weight: 100 parts of polyaspartic ester, 55 parts of diisocyanate, 56 parts of heterocyclic aramid fiber and 8 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 fourth step and the fifth step of example 1 were performed, but the common unmodified polyaspartate was used in the fifth step, instead of the polyaspartate-polyethylene composite powder.
Comparative example 3:
the comparative example shows a repair material, which is different from example 1 in that only the modification of ultra-high molecular weight polyethylene is performed during the synthesis of polyurea from polyaspartic ester and diisocyanate, and the modification of heterocyclic aramid fiber is not performed.
The comparative example is prepared from the following raw materials in parts by weight: 100 parts of polyaspartic ester, 55 parts of diisocyanate, 36 parts of ultra-high molecular weight polyethylene and 8 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 this comparative example: only the third step and the fifth step of example 1 were performed, but the third step was performed by using ordinary unmodified ultra-high molecular weight polyethylene, instead of the active polyethylene composite powder, to prepare a suspension. And in the fifth step, the modified heterocyclic aramid fiber and the silane coupling agent prepared in the fourth step are not added.
Comparative example 4:
the comparative example shows a repair material, which is different from example 1 in that only the modification of the common molecular weight polyethylene is performed and the modification of the heterocyclic aramid fiber is not performed in the process of synthesizing polyurea from polyaspartic ester and diisocyanate.
The comparative example is prepared from the following raw materials in parts by weight: 100 parts of polyaspartic ester, 55 parts of diisocyanate, 36 parts of common molecular weight polyethylene and 8 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 number average molecular weight of the common molecular weight polyethylene is 10-20 ten thousand.
The preparation method of the repair material of this comparative example: only the third step and the fifth step of example 1 were performed, but the suspension prepared by using the conventional unmodified conventional molecular weight polyethylene in the third step, not the active polyethylene composite powder. And in the fifth step, the modified heterocyclic aramid fiber and the silane coupling agent prepared in the fourth step are not added.
Comparative example 5:
the comparative example shows a repair material, which is different from example 1 in that only the modification of ultra-high molecular weight polyethylene is performed during the synthesis of polyurea from polyaspartic ester and diisocyanate, and the modification of heterocyclic aramid fiber is not performed. The ultra-high molecular weight polyethylene herein is subject to optimization of processing characteristics.
The comparative example is prepared from the following raw materials in parts by weight: 100 parts of polyaspartic ester, 55 parts of diisocyanate, 36 parts of ultrahigh molecular weight polyethylene, 10 parts of low molecular weight polyethylene and 8 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 first, third and fifth steps of example 1 were carried out, but the third step was carried out using the polyethylene composite powder obtained in the first step, instead of using the active polyethylene composite powder, to prepare a suspension. And in the fifth step, the modified heterocyclic aramid fiber and the silane coupling agent prepared in the fourth step are not added.
Comparative example 6:
the comparative example shows a repair material, which is different from example 1 in that only the modification of ultra-high molecular weight polyethylene is performed during the synthesis of polyurea from polyaspartic ester and diisocyanate, and the modification of heterocyclic aramid fiber is not performed. The ultrahigh molecular weight polyethylene is modified and optimized active polyethylene composite powder.
The comparative example is prepared from the following raw materials in parts by weight: 100 parts of polyaspartic ester, 55 parts of diisocyanate, 36 parts of ultrahigh molecular weight polyethylene, 10 parts of low molecular weight polyethylene, 6 parts of cross-linking agent, 52 parts of silane coupling agent and 8 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 first, second, third and fifth steps of example 1 were performed, but the modified heterocyclic aramid fiber obtained in the fourth step and the silane coupling agent were not added in the fifth step.
Comparative example 7:
the comparative example shows a repair material, which is different from example 1 in that only the modification of ultra-high molecular weight polyethylene is performed during the synthesis of polyurea from polyaspartic ester and diisocyanate, and the modification of heterocyclic aramid fiber is not performed. The ultrahigh molecular weight polyethylene is modified and optimized active polyethylene composite powder, and the quality is enlarged.
The comparative example is prepared from the following raw materials in parts by weight: 100 parts of polyaspartic ester, 55 parts of diisocyanate, 92 parts of ultrahigh molecular weight polyethylene, 10 parts of low molecular weight polyethylene, 6 parts of cross-linking agent, 52 parts of silane coupling agent and 8 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 first, second, third and fifth steps of example 1 were performed, but the modified heterocyclic aramid fiber obtained in the fourth step and the silane coupling agent were not added in the fifth step.
Comparative example 8:
the comparative example shows a repair material, which is different from example 1 in that only the heterocyclic aramid fiber is modified and not the ultra-high molecular weight polyethylene is modified during the synthesis of polyurea from polyaspartic ester and diisocyanate. Here, the mass of the heterocyclic aramid fiber increases.
The comparative example is prepared from the following raw materials in parts by weight: 100 parts of polyaspartic ester, 55 parts of diisocyanate, 92 parts of heterocyclic aramid fiber and 8 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 fourth step and the fifth step of example 1 were performed, but the common unmodified polyaspartate was used in the fifth step, instead of the polyaspartate-polyethylene composite powder.
And (3) performance test results:
in order to verify the relevant performance of the high-strength durable rapid repair material for roads, according to the 2 nd part of the rapid repair material for the cement concrete for the road engineering: the results of the basic performance tests such as tensile strength at room temperature (25 ℃), elongation at break, shear resistance, pull-out resistance, and impact strength at room temperature and the indoor simulation test were conducted on the repair materials obtained in examples and comparative examples of the present invention according to the regulations in the Polymer repair materials, the resin casting Performance test methods (GB/T2567-2008), and the Plastic Izod impact Strength tests (GB/T1843-2008), and 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 examples 1 to 9 and comparative examples 1 to 4, it can be found that the strength and toughness of polyurea can not be improved basically by using common molecular weight polyethylene, and can be improved significantly by using ultra-high molecular weight polyethylene and heterocyclic aramid fiber, respectively, compared with polyurea which is not modified. With the increase of the ultra-high molecular weight polyethylene, the strength indexes of the repair material, such as the drawing strength, the shear strength, the impact strength and the like, are gradually increased, the flexibility indexes, such as the tensile strength, the elongation at break and the like, are slightly reduced, and the gelation time is gradually increased but the amplitude is not large. With the increase of the heterocyclic aramid fiber, the flexibility indexes of the repair material, such as tensile strength, elongation at break and the like, are gradually increased, and the amplitude is larger; the strength indexes such as drawing strength, shearing strength, impact strength and the like are gradually increased and have smaller amplitude; the gel time gradually increases with a large amplitude.
(2) By analyzing the indexes of the comparative examples 1, 2, 3 and 8, the heterocyclic 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 9, the heterocyclic aramid fiber is stronger than the ultra-high molecular weight polyethylene in the aspect of improving the toughness of the polyurea, but the gel time is greatly increased, because the heterocyclic aramid fiber is added into the polyurea in the form of chopped fiber, the specific surface area is small compared with the ultra-high molecular weight polyethylene powder form, and the contact and reaction time with the solution is relatively longer.
(3) By analyzing the indexes of the comparative examples 1 to 8, the strength and toughness of the polyurea can be better improved by the ultra-high molecular weight polyethylene compared with the polyurea which is not subjected to modification treatment, but the strength, particularly the impact strength of the material is mainly improved. On the basis, compared with examples 1 to 9, it can be found that the gel time of the repair material can be reduced after the low molecular weight polyethylene is added, which shows that the processing characteristics of the ultra-high molecular weight polyethylene can be improved after the low molecular weight polyethylene and the ultra-high molecular weight polyethylene are melt blended. In addition, after the cross-linking agent and the silane coupling agent are added, cross-linked ultrahigh molecular weight polyethylene is formed, and the strength of the repair material is further increased.
(4) Comparing the indexes of examples 1-9 and comparative examples 1-8, 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 polyaspartic acid ester, 55 parts of diisocyanate, 36 parts of ultra-high molecular weight polyethylene, 10 parts of low molecular weight polyethylene, 56 parts of heterocyclic aramid fiber, 6 parts of a cross-linking agent, 52 parts of a silane coupling agent and 8 parts of a defoaming agent.
Claims (8)
1. The preparation method of the high-strength durable rapid repair material for the road is characterized in that the high-strength durable rapid repair material for the road is prepared from the following raw materials in parts by weight: 100 parts of polyaspartic acid ester, 55 parts of diisocyanate, 35-40 parts of ultra-high molecular weight polyethylene, 8-12 parts of low molecular weight polyethylene, 52-60 parts of heterocyclic aramid fiber, 4-8 parts of cross-linking agent, 50-55 parts of silane coupling agent and 6-10 parts of defoaming agent;
the method comprises the following steps:
step one, optimizing the processing characteristics of the ultra-high molecular weight polyethylene:
carrying out physical melting and blending on the ultra-high molecular weight polyethylene and the low molecular weight polyethylene, heating at 240-245 ℃ for a short time, and then cooling and rolling into powdery solid to prepare polyethylene composite powder;
step two, preparing active polyethylene composite powder:
dissolving a cross-linking agent by absolute ethyl alcohol, adding polyethylene composite powder into the absolute ethyl alcohol containing the cross-linking agent, heating to 65-70 ℃ while stirring, performing ultrasonic dispersion and uniform mixing, volatilizing the absolute ethyl alcohol, and drying to obtain active polyethylene composite powder containing the cross-linking agent;
step three, preparing polyaspartic ester-polyethylene composite powder:
uniformly dispersing polyaspartic ester with one third of formula proportion in absolute ethyl alcohol under stirring, and then adding active polyethylene composite powder to prepare suspension; adding the suspension into a ball milling tank of a ball mill, performing ball milling, volatilizing absolute ethyl alcohol after the ball milling is finished, and drying to obtain polyaspartic ester-polyethylene composite powder;
step four, preparing the modified heterocyclic aramid fiber:
soaking the heterocyclic aramid fiber in absolute ethyl alcohol for 2 hours, washing with distilled water to remove stains on the surface of the fiber, and drying; adding the dried heterocyclic aramid fiber into diisocyanate, and then performing ultrasonic dispersion to uniformly disperse the heterocyclic aramid fiber in the diisocyanate to prepare modified heterocyclic aramid fiber;
step five, preparing the composite modified polyurea:
sequentially adding the polyaspartic ester-polyethylene composite powder prepared in the step three and a silane coupling agent into the remaining two thirds of the polyaspartic ester in the formula ratio, and stirring the mixture by using a glass rod while adding the mixture until the mixture is uniformly dispersed; and heating and maintaining the temperature of the solution at 75-80 ℃, adding the modified heterocyclic aramid fiber prepared in the fourth step and a defoaming agent, and fully reacting to finally prepare the composite modified polyurea, namely the high-strength durable quick repair material for roads.
2. A method for preparing a high-strength durable rapid repair material for roads according to claim 1, wherein in the step one, the short-term heating time is 15min to 20 min;
in the second step, the mixture is heated to 65-70 ℃ and then continuously stirred for 5 min; the ultrasonic dispersion process is ultrasonic dispersion for 30min by an ultrasonic dispersion machine;
in the third step, zirconia balls are put into the ball milling process according to the ball material mass ratio of 4: 1;
in the fourth step, the ultrasonic dispersion process is ultrasonic dispersion for 30min by an ultrasonic dispersion machine.
3. A method for preparing a high-strength durable rapid repair material for roads according to claim 1, wherein the number average molecular weight of the ultra-high molecular weight polyethylene is 150 to 200 ten thousand; the number average molecular weight of the low molecular weight polyethylene is 1000-5000.
4. A method for preparing a high strength durable quick repair material for roads as claimed in claim 1, wherein the molecular formula of said heterocyclic aramid fiber is:
the polymerization degree is 300 to 500.
5. The preparation method of the high-strength durable rapid repair material for the road according to claim 1, wherein the heterocyclic aramid fiber is a chopped fiber with a length of 2-4 mm and a diameter of 10-15 μm.
6. A method for preparing a high-strength durable rapid repair material for roads according to claim 1, wherein the degree of polymerization of the polyaspartic ester is 200 to 400;
the diisocyanate is more than one of toluene diisocyanate, diphenylmethane diisocyanate and hexamethylene diisocyanate;
the cross-linking agent is 2, 5-dimethyl-2, 5-di-tert-butyl peroxy hexyne-3 or dicumyl peroxide;
the silane coupling agent is vinyl trimethoxy silane, vinyl triethoxy silane or allyl siloxane;
the defoaming agent is emulsified silicone oil.
7. A method for preparing a high-strength durable rapid repair material for roads according to claim 1, wherein the material is prepared from the following raw materials in parts by weight: 100 parts of polyaspartic acid ester, 55 parts of diisocyanate, 36-38 parts of ultra-high molecular weight polyethylene, 10-12 parts of low molecular weight polyethylene, 56-60 parts of heterocyclic aramid fiber, 6-7 parts of a cross-linking agent, 52-54 parts of a silane coupling agent and 6-10 parts of a defoaming agent.
8. The method for preparing a high-strength durable rapid repair material for roads according to claim 7, wherein the material is prepared from the following raw materials in parts by weight: 100 parts of polyaspartic acid ester, 55 parts of diisocyanate, 36 parts of ultra-high molecular weight polyethylene, 10 parts of low molecular weight polyethylene, 56 parts of heterocyclic aramid fiber, 6 parts of a cross-linking agent, 52 parts of a silane coupling agent and 8 parts of a defoaming agent.
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