CN116813236B - Material for reducing freezing point of asphalt pavement and preparation method thereof - Google Patents
Material for reducing freezing point of asphalt pavement and preparation method thereof Download PDFInfo
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- CN116813236B CN116813236B CN202310784567.1A CN202310784567A CN116813236B CN 116813236 B CN116813236 B CN 116813236B CN 202310784567 A CN202310784567 A CN 202310784567A CN 116813236 B CN116813236 B CN 116813236B
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- 239000000463 material Substances 0.000 title claims abstract description 90
- 239000010426 asphalt Substances 0.000 title claims abstract description 41
- 238000007710 freezing Methods 0.000 title claims abstract description 35
- 230000008014 freezing Effects 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 64
- 239000007822 coupling agent Substances 0.000 claims abstract description 35
- 239000011248 coating agent Substances 0.000 claims abstract description 33
- 238000000576 coating method Methods 0.000 claims abstract description 33
- 239000003085 diluting agent Substances 0.000 claims abstract description 27
- 239000000203 mixture Substances 0.000 claims abstract description 27
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims abstract description 23
- 239000002994 raw material Substances 0.000 claims abstract description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 90
- 239000003822 epoxy resin Substances 0.000 claims description 58
- 229920000647 polyepoxide Polymers 0.000 claims description 58
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 39
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexyloxide Natural products O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 claims description 27
- 239000002245 particle Substances 0.000 claims description 25
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 24
- 239000000243 solution Substances 0.000 claims description 23
- 238000001035 drying Methods 0.000 claims description 21
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 claims description 20
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 19
- 239000001110 calcium chloride Substances 0.000 claims description 19
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 19
- 239000003795 chemical substances by application Substances 0.000 claims description 19
- 238000001816 cooling Methods 0.000 claims description 17
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 16
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 16
- 238000005406 washing Methods 0.000 claims description 14
- 238000000227 grinding Methods 0.000 claims description 13
- 238000001354 calcination Methods 0.000 claims description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 9
- 238000005470 impregnation Methods 0.000 claims description 8
- 238000000967 suction filtration Methods 0.000 claims description 8
- 239000008367 deionised water Substances 0.000 claims description 7
- 229910021641 deionized water Inorganic materials 0.000 claims description 7
- 238000006386 neutralization reaction Methods 0.000 claims description 7
- UWFRVQVNYNPBEF-UHFFFAOYSA-N 1-(2,4-dimethylphenyl)propan-1-one Chemical compound CCC(=O)C1=CC=C(C)C=C1C UWFRVQVNYNPBEF-UHFFFAOYSA-N 0.000 claims description 6
- 239000004593 Epoxy Substances 0.000 claims description 6
- 238000010790 dilution Methods 0.000 claims description 6
- 239000012895 dilution Substances 0.000 claims description 6
- 238000009826 distribution Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000011259 mixed solution Substances 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 5
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 4
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 3
- 239000012752 auxiliary agent Substances 0.000 claims description 3
- 229910019142 PO4 Inorganic materials 0.000 claims description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 2
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 2
- 239000010452 phosphate Substances 0.000 claims description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 2
- 239000011780 sodium chloride Substances 0.000 claims description 2
- 230000000881 depressing effect Effects 0.000 claims 2
- 125000002243 cyclohexanonyl group Chemical group *C1(*)C(=O)C(*)(*)C(*)(*)C(*)(*)C1(*)* 0.000 claims 1
- 239000004480 active ingredient Substances 0.000 abstract description 11
- 239000011247 coating layer Substances 0.000 abstract description 10
- 230000002265 prevention Effects 0.000 abstract description 2
- 239000002344 surface layer Substances 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 34
- 229940043237 diethanolamine Drugs 0.000 description 17
- 230000000694 effects Effects 0.000 description 17
- 238000002844 melting Methods 0.000 description 14
- 230000008018 melting Effects 0.000 description 12
- 238000002791 soaking Methods 0.000 description 11
- 239000000843 powder Substances 0.000 description 10
- 238000010521 absorption reaction Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 239000011148 porous material Substances 0.000 description 6
- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical group CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 description 5
- 239000005909 Kieselgur Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000011160 research Methods 0.000 description 5
- 239000002253 acid Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 150000001805 chlorine compounds Chemical class 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
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- 238000012423 maintenance Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- -1 salt compounds Chemical class 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 206010039203 Road traffic accident Diseases 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
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- 230000007797 corrosion Effects 0.000 description 1
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- 150000004985 diamines Chemical class 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- 239000012535 impurity Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000013268 sustained release Methods 0.000 description 1
- 239000012730 sustained-release form Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
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- Road Paving Structures (AREA)
Abstract
The invention belongs to the technical field of road pavement freezing prevention and deicing, and particularly relates to a material for reducing an asphalt pavement freezing point and a preparation method thereof, wherein the material comprises the following raw materials in parts by weight: 55-85 parts of chloride, 90-120 parts of water, 20-40 parts of inorganic porous carrier, 9-17 parts of coating material and 15-30 parts of coupling agent diluent. The coating layer formed by adopting the specific coating material has excellent wet heat resistance, can reduce the release of the active ingredients of the chloride in rainy seasons in summer, has a certain brittleness at low temperature in winter, can increase the release of the active ingredients of the chloride, and prolongs the service life of the material; the material is used as a material for actively reducing the freezing point of the road surface, is added into the asphalt mixture according to a proportion, does not influence various performance indexes of the asphalt mixture, is suitable for paving the surface layers of various asphalt pavements, greatly reduces the potential safety hazards of road travelling in ice and snow weather, and remarkably improves the convenience and safety of travelling in winter of residents; the material is used for removing snow more quickly and conveniently, and is safe and environment-friendly.
Description
Technical Field
The invention belongs to the technical field of road pavement freezing prevention and deicing, and particularly relates to a material for reducing the freezing point of an asphalt pavement and a preparation method thereof.
Background
With the rapid development of the economy in China, road traffic has become a life line of modern cities. However, the potential safety hazard of ice and snow road surfaces in winter is great, so that traffic accidents are frequent, the transportation efficiency of roads is reduced, and the life and property losses of people are caused. And the road ice and snow problem has long duration and large harm, and seriously affects the normal production and life of cities.
The traditional snow-removing mode applied at present mainly comprises mechanical snow-removing and snow-melting agent spreading so as to achieve the aim of removing ice and snow on roads, but the mechanical snow-removing method not only needs a large amount of machinery, but also needs a large amount of manual operation, and is time-consuming and labor-consuming; the snow-melting agent is spread to cause corrosion damage to roads and auxiliary facilities, so that farmland crops and greening vegetation on two sides of the roads can be polluted, and serious environmental protection problem exists. In a word, the traditional snow removing mode has a plurality of defects, so that the investment cost is high, the labor amount is large, the large-scale popularization is difficult, and the development trend of greenization is not met.
In order to remove snow conveniently, quickly, safely and environmentally-friendly, the active deicing and snow removing technology is attracting more attention, a certain amount of active deicing materials are doped in pavement materials, and chloride is gradually separated out from the interior of the pavement through vehicle load and capillary action, so that the purpose of cleaning ice and snow is achieved.
Disclosure of Invention
In order to solve the technical problems, the invention provides a material for reducing the freezing point of an asphalt pavement and a preparation method thereof, and the material has a slow release function, so that the rapid loss of effective salt in high-temperature rainy seasons in summer is avoided, the good snow-removing and deicing effects are ensured, and the service life of the material is prolonged.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the invention provides a material for reducing the freezing point of an asphalt pavement, which comprises the following raw materials in parts by weight: 55-85 parts of chloride, 90-120 parts of water, 20-40 parts of inorganic porous carrier, 9-17 parts of coating material and 15-30 parts of coupling agent diluent.
Preferably, the raw materials for preparing the material comprise the following raw materials in parts by weight: 60-80 parts of chloride, 100-110 parts of water, 20-40 parts of inorganic porous carrier, 13-15 parts of coating material and 15-30 parts of coupling agent diluent.
In some embodiments, the chloride comprises at least one of sodium chloride, magnesium chloride, and calcium chloride.
Preferably, the chloride is calcium chloride.
In some embodiments, the inorganic porous support comprises at least one of zeolite powder, diatomaceous earth, bentonite.
In some embodiments, the diatomaceous earth is pretreated diatomaceous earth, the pretreatment step comprising: calcining original diatomite at 380-420 ℃ for 3-5h to obtain primary diatomite, soaking the primary diatomite at 75-85 ℃ with 20% sulfuric acid solution for 1.5-2.5h to obtain secondary diatomite, soaking the secondary diatomite at 65-75 ℃ with 5% sodium hydroxide solution for 5-9min, and carrying out suction filtration, washing and drying to obtain the tertiary diatomite.
Preferably, the specific steps of the pretreatment of the diatomite comprise: calcining original diatomite for 4 hours at 395 ℃ to obtain primary diatomite, carrying out impregnation treatment on the primary diatomite at 78 ℃ for 2 hours by using a 20% sulfuric acid solution to obtain secondary diatomite, carrying out impregnation treatment on the secondary diatomite at 70 ℃ by using a 5% sodium hydroxide solution for 7 minutes, and carrying out suction filtration, washing and drying to obtain the tertiary diatomite.
More preferably, the original diatomaceous earth has a particle size of 200 to 400 mesh.
The source of the original diatomite is not particularly limited, and the original diatomite can be purchased commercially.
The diatomite has rich pore structures and larger specific surface area, so that the diatomite can be used as a carrier for adsorbing hydrated salt, but in practice, a plurality of pore structures of the diatomite are filled with impurities, so that the diatomite has weaker capability of adsorbing active ingredients of chlorides, further the long-acting use of the diatomite in snow melting and deicing in winter is limited, the application sequentially carries out high-temperature calcination, acid washing and alkali washing under specific conditions, the obtained three-stage diatomite has rich mesopores, the containing volume and specific surface area of the diatomite are improved, the diatomite has stronger adsorption capacity when being used as a porous carrier of the chlorides, the long-acting utilization of the active ingredients of the snow melting and deicing is realized, the applicant believes that some substances are decomposed and removed through the high-temperature calcination, fragments are stored in the surfaces and the pores of the diatomite after calcination, the specific acid washing is further adopted for soaking, the metal oxides are removed, the effect of the pores is further ensured, the diatomite has larger specific surface area and adsorption capacity, but the secondary diatomite after the acid washing is unexpectedly found in research, although the diatomite can uniformly adsorb calcium chloride, the water absorption capacity is improved, the absorption capacity of the calcium chloride is improved, the absorption capacity is improved, the absorption rate of the capillary is improved, and the absorption rate of the water absorption is improved, and the absorption rate is improved.
In some embodiments, the coating material comprises a modified epoxy resin and a curing agent in a weight ratio of (3-4): 1.
in some embodiments, the preparation step of the modified epoxy resin comprises: mixing epoxy resin and a diluent, preserving heat for 5-15min, heating to 60-70 ℃, adding diethanolamine, reacting for 2-3h, cooling, adding acetic acid for neutralization, and adding deionized water for dilution to obtain the modified epoxy resin.
In some embodiments, the epoxy resin is an F-51 phenolic epoxy resin having an epoxy equivalent weight of 0.5 to 0.58eq/100g.
In some embodiments, the diluent is ethylene glycol diglycidyl ether, and the weight ratio of the epoxy resin to the diluent is 1: (0.1-0.5), preferably 1:0.35.
In some embodiments, the weight ratio of diethanolamine to epoxy resin is 1: (5.2-5.6), preferably 1:5.4.
In some embodiments, the acetic acid is present in an amount of 40 to 50wt% of the diethanolamine.
In some embodiments, the curing agent is a polyether diamine curing agent, preferably curing agent D230.
In the prior art, a certain deicing material is generally doped in a pavement material, chloride is gradually precipitated from the interior of the pavement through the load and capillary action of a vehicle to achieve the aim of removing ice and snow, but in summer with high temperature and raininess, the chloride doped in the pavement is easy to quickly run off, after research by the applicant, the porous carrier absorbing the chloride is coated by adopting a certain coating material to reduce the release of active ingredients of the chloride under the condition of raininess in summer, if the selection of the coating material is very critical to achieve the effect, some researches often select epoxy resin as the coating material, but the applicant finds that the environment with high temperature and raininess in summer is worse, the conventional epoxy resin can lead the surface of the coating to have a plurality of pores to absorb water seriously after being solidified for a long time under the damp and hot condition, the method further causes the exudation of the packed chloride to cause the early release of snow melting components and waste, and the applicant finds that a special modified epoxy resin is adopted after a great deal of researches, and particularly, the epoxy resin is mixed with a diluent and then is insulated for 5-15min, then diethanolamine is added, the reaction is carried out for 2-3h, then acetic acid is added for neutralization, and the modified epoxy resin obtained by diluting deionized water coats a porous carrier absorbing the active ingredients of the chloride, so that the porous carrier has excellent moist heat resistance, avoids the rapid loss of the active salts in high-temperature rainy seasons in summer, prolongs the service life of the material while ensuring good snow cleaning and deicing effects, and further reduces the use and maintenance cost, and the main reason is that the modified epoxy resin obtained under the preparation condition has better compatibility with the curing agent, so that uniformly distributed curing crosslinking points are formed on the porous carrier, and a crosslinking structure with relatively high density is formed, thereby endowing the coating material with good wet heat resistance; the addition of the diethanolamine and the diluent is regulated and controlled, so that the moisture and heat resistance is ensured, and meanwhile, certain low-temperature brittleness can be kept, and the coating material can generate partial crack and capillary effect due to rolling of a running vehicle in a low-temperature environment in winter, so that the quick release of active ingredient chlorides is promoted, and the purposes of removing snow and ice well in rainy and snowy weather or frozen environment are achieved.
In some embodiments, the coating material further comprises 1-5 parts by weight of a slow release aid, wherein the slow release aid is cyclohexanone.
The applicant finds that the coating material has excellent wet heat resistance through the specific modified epoxy resin in the process, so that the rapid loss of effective salt in summer high-temperature rainy seasons is avoided, but the coating material can have a certain influence on the slow release effect of chloride in ice and snow environments, and the applicant finds that the slow release effect of the effective component of chloride in low-temperature environments can be enhanced by adding the specific cyclohexanone together with the modified epoxy resin when coating is carried out after research, and the main reason is that the cyclohexanone can dilute a coating solution formed by the modified epoxy resin, so that the coating layer thickness of the coated inorganic porous carrier is moderate, and on the basis of ensuring the coating effect, the moisture in an asphalt pavement can easily penetrate through the layer to release enough salt compounds in time, so that the slow release effect of the coating material is ensured.
In some embodiments, the coupling agent diluent is a mixed solution of coupling agent and absolute ethanol, and the weight ratio of the coupling agent to the absolute ethanol is 1 (7-10).
Preferably, the weight ratio of the coupling agent to the absolute ethanol is 1:9.
In some embodiments, the coupling agent comprises at least one of a phosphate coupling agent, a titanate coupling agent, a silane coupling agent.
Preferably, the coupling agent is a silane coupling agent.
Further, the coupling agent is gamma-aminopropyl triethoxysilane.
The compatibility between the coating material and the inorganic porous carrier can be well improved by adding the coupling agent diluent with a specific proportion, so that the coating material can form uniform coating on the surface of the inorganic porous carrier.
The invention also provides a preparation method of the material for reducing the freezing point of the asphalt pavement, which comprises the following steps:
s1, dissolving chloride in water, adding an inorganic porous carrier, stirring for 20-40min, and then drying and grinding to obtain a mixture A;
s2, adding the coupling agent diluent and the coating material into the mixture A obtained in the step S1, forming a layer of coating on the surface of the mixture A, and then drying, cooling and grinding to obtain the material for reducing the freezing point of the asphalt pavement.
In some embodiments, the particle size distribution of the asphalt pavement freezing point-lowering material is as follows: according to the weight percentage, the particle size is less than 100 percent of 0.6mm, 90-100 percent of the particle size is less than 0.15mm, and 70-100 percent of the particle size is less than 0.075 mm.
The working principle of the material of the invention is as follows: when the road surface is subjected to compression, vibration, abrasion and other load actions of a running vehicle in ice and snow weather, due to the existence of pores of a road surface structure, snow water gradually permeates into the mixture, and a coating layer at low temperature in winter becomes brittle to generate microcracks, so that moisture easily passes through the coating layer to form salt solution through the saturation pressure and capillary action.
Compared with the prior art, the invention has the following beneficial effects:
(1) The diatomite which is subjected to specific alkaline washing impregnation treatment after calcination and acid washing impregnation is adopted, so that the water absorption rate of calcium chloride carried by the diatomite is high, more mesopores are formed, a mass transfer channel is provided for the diffusion of water and saline solution, and the timely release of snow melting components is facilitated;
(2) The material has a slow release effect, and the coating layer formed by adopting the specific coating material has excellent wet heat resistance, so that the release of the active ingredients of the chloride can be reduced in rainy seasons in summer, the release of the active ingredients of the chloride can be increased due to certain brittleness at low temperature in winter, the service life of the material is prolonged, and the use and maintenance cost is reduced;
(3) The invention can enhance the slow release effect of the active ingredient of the chloride in the low-temperature environment by adding the specific slow release auxiliary agent together with the modified epoxy resin when coating, so that the coating layer thickness of the coated inorganic porous carrier is moderate, and on the basis of ensuring the coating effect, the water in the asphalt pavement can easily penetrate through the layer to release enough salt compounds in time, thereby ensuring the slow release effect of the coating material.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in connection with the embodiments, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The material for lowering the freezing point of the asphalt pavement comprises the following raw materials in parts by weight: 60 parts of calcium chloride, 100 parts of water, 40 parts of diatomite, 10 parts of modified epoxy resin, 3 parts of curing agent D2303 parts of cyclohexanone and 20 parts of coupling agent diluent.
Pretreatment of diatomite: calcining 300-mesh original diatomite at 395 ℃ for 4 hours to obtain primary diatomite, soaking the primary diatomite at 78 ℃ for 2 hours with 20% sulfuric acid solution to obtain secondary diatomite, soaking the secondary diatomite at 70 ℃ for 7 minutes with 5% sodium hydroxide solution, and carrying out suction filtration, washing and drying to obtain the tertiary diatomite.
The preparation method of the modified epoxy resin comprises the following steps: mixing F-51 phenolic epoxy resin and ethylene glycol diglycidyl ether according to a weight ratio of 1:0.35, preserving heat for 12min, heating to 68 ℃, adding diethanolamine, reacting for 2.5h, cooling, adding acetic acid for neutralization, and adding deionized water equivalent to the F-51 phenolic epoxy resin for dilution to obtain the modified epoxy resin.
The epoxy equivalent of the F-51 phenolic epoxy resin is 0.5-0.58eq/100g, and the weight ratio of the diethanol amine to the epoxy resin is 1:5.4, the amount of acetic acid is 45wt% of the amount of diethanolamine.
The coupling agent diluent is a mixed solution of gamma-aminopropyl triethoxysilane and absolute ethyl alcohol, and the weight ratio is 1:9.
the preparation method of the material for reducing the freezing point of the asphalt pavement comprises the following steps:
s1, dissolving calcium chloride in water, adding tertiary diatomite, stirring for 30min, drying at 105 ℃ for 12h, cooling to room temperature, and grinding into powder to obtain a mixture A;
s2, adding the coupling agent diluent into the mixture A obtained in the step S1, continuously stirring the epoxy resin, the curing agent and the cyclohexanone for 30min in the stirring process to form a coating layer on the surface of the mixture A, and then drying, cooling and grinding for 2min to obtain the material for reducing the freezing point of the asphalt pavement.
Wherein the particle size distribution of the milled powder is as follows: according to the weight percentage, the particle size is less than 100 percent of 0.6mm, 90-100 percent of the particle size is less than 0.15mm, and 70-100 percent of the particle size is less than 0.075 mm.
Example 2
The material for lowering the freezing point of the asphalt pavement comprises the following raw materials in parts by weight: 70 parts of calcium chloride, 100 parts of water, 30 parts of diatomite, 12 parts of modified epoxy resin, 4 parts of curing agent D2304 parts, 1 part of cyclohexanone and 20 parts of coupling agent diluent.
Pretreatment of diatomite: calcining 300-mesh original diatomite at 395 ℃ for 4 hours to obtain primary diatomite, soaking the primary diatomite at 78 ℃ for 2 hours with 20% sulfuric acid solution to obtain secondary diatomite, soaking the secondary diatomite at 70 ℃ for 7 minutes with 5% sodium hydroxide solution, and carrying out suction filtration, washing and drying to obtain the tertiary diatomite.
The preparation method of the modified epoxy resin comprises the following steps: mixing F-51 phenolic epoxy resin and ethylene glycol diglycidyl ether according to a weight ratio of 1:0.35, preserving heat for 12min, heating to 68 ℃, adding diethanolamine, reacting for 2.5h, cooling, adding acetic acid for neutralization, and adding deionized water equivalent to the F-51 phenolic epoxy resin for dilution to obtain the modified epoxy resin.
The epoxy equivalent of the F-51 phenolic epoxy resin is 0.5-0.58eq/100g, and the weight ratio of the diethanol amine to the epoxy resin is 1:5.4, the amount of acetic acid is 45wt% of the amount of diethanolamine.
The coupling agent diluent is a mixed solution of gamma-aminopropyl triethoxysilane and absolute ethyl alcohol, and the weight ratio is 1:9.
the preparation method of the material for reducing the freezing point of the asphalt pavement comprises the following steps:
s1, dissolving calcium chloride in water, adding tertiary diatomite, stirring for 30min, drying at 105 ℃ for 12h, cooling to room temperature, and grinding into powder to obtain a mixture A;
s2, adding the coupling agent diluent into the mixture A obtained in the step S1, continuously stirring the epoxy resin, the curing agent and the cyclohexanone for 30min in the stirring process to form a coating layer on the surface of the mixture A, and then drying, cooling and grinding for 2min to obtain the material for reducing the freezing point of the asphalt pavement.
Wherein the particle size distribution of the milled powder is as follows: according to the weight percentage, the particle size is less than 100 percent of 0.6mm, 90-100 percent of the particle size is less than 0.15mm, and 70-100 percent of the particle size is less than 0.075 mm.
Examples3
The material for lowering the freezing point of the asphalt pavement comprises the following raw materials in parts by weight: 80 parts of calcium chloride, 110 parts of water, 20 parts of diatomite, 12 parts of modified epoxy resin, 3 parts of curing agent D2303 parts of cyclohexanone, and 16 parts of coupling agent diluent.
Pretreatment of diatomite: calcining 300-mesh original diatomite at 395 ℃ for 4 hours to obtain primary diatomite, soaking the primary diatomite at 78 ℃ for 2 hours with 20% sulfuric acid solution to obtain secondary diatomite, soaking the secondary diatomite at 70 ℃ for 7 minutes with 5% sodium hydroxide solution, and carrying out suction filtration, washing and drying to obtain the tertiary diatomite.
The preparation method of the modified epoxy resin comprises the following steps: mixing F-51 phenolic epoxy resin and ethylene glycol diglycidyl ether according to a weight ratio of 1:0.35, preserving heat for 12min, heating to 68 ℃, adding diethanolamine, reacting for 2.5h, cooling, adding acetic acid for neutralization, and adding deionized water equivalent to the F-51 phenolic epoxy resin for dilution to obtain the modified epoxy resin.
The epoxy equivalent of the F-51 phenolic epoxy resin is 0.5-0.58eq/100g, and the weight ratio of the diethanol amine to the epoxy resin is 1:5.4, the amount of acetic acid is 45wt% of the amount of diethanolamine.
The coupling agent diluent is a mixed solution of gamma-aminopropyl triethoxysilane and absolute ethyl alcohol, and the weight ratio is 1:9.
the preparation method of the material for reducing the freezing point of the asphalt pavement comprises the following steps:
s1, dissolving calcium chloride in water, adding tertiary diatomite, stirring for 30min, drying at 105 ℃ for 12h, cooling to room temperature, and grinding into powder to obtain a mixture A;
s2, adding the coupling agent diluent into the mixture A obtained in the step S1, continuously stirring the epoxy resin, the curing agent and the cyclohexanone for 30min in the stirring process to form a coating layer on the surface of the mixture A, and then drying, cooling and grinding for 2min to obtain the material for reducing the freezing point of the asphalt pavement.
Wherein the particle size distribution of the milled powder is as follows: according to the weight percentage, the particle size is less than 100 percent of 0.6mm, 90-100 percent of the particle size is less than 0.15mm, and 70-100 percent of the particle size is less than 0.075 mm.
Example 4
The material for lowering the freezing point of the asphalt pavement comprises the following raw materials in parts by weight: 80 parts of calcium chloride, 110 parts of water, 30 parts of diatomite, 12 parts of modified epoxy resin, 3 parts of curing agent D2303 parts of cyclohexanone, 5 parts of coupling agent diluent and 30 parts of coupling agent diluent.
Pretreatment of diatomite: calcining 300-mesh original diatomite at 395 ℃ for 4 hours to obtain primary diatomite, soaking the primary diatomite at 78 ℃ for 2 hours with 20% sulfuric acid solution to obtain secondary diatomite, soaking the secondary diatomite at 70 ℃ for 7 minutes with 5% sodium hydroxide solution, and carrying out suction filtration, washing and drying to obtain the tertiary diatomite.
The preparation method of the modified epoxy resin comprises the following steps: mixing F-51 phenolic epoxy resin and ethylene glycol diglycidyl ether according to a weight ratio of 1:0.35, preserving heat for 12min, heating to 68 ℃, adding diethanolamine, reacting for 2.5h, cooling, adding acetic acid for neutralization, and adding deionized water equivalent to the F-51 phenolic epoxy resin for dilution to obtain the modified epoxy resin.
The epoxy equivalent of the F-51 phenolic epoxy resin is 0.5-0.58eq/100g, and the weight ratio of the diethanol amine to the epoxy resin is 1:5.4, the amount of acetic acid is 45wt% of the amount of diethanolamine.
The coupling agent diluent is a mixed solution of gamma-aminopropyl triethoxysilane and absolute ethyl alcohol, and the weight ratio is 1:9.
the preparation method of the material for reducing the freezing point of the asphalt pavement comprises the following steps:
s1, dissolving calcium chloride in water, adding tertiary diatomite, stirring for 30min, drying at 105 ℃ for 12h, cooling to room temperature, and grinding into powder to obtain a mixture A;
s2, adding the coupling agent diluent into the mixture A obtained in the step S1, continuously stirring the epoxy resin, the curing agent and the cyclohexanone for 30min in the stirring process to form a coating layer on the surface of the mixture A, and then drying, cooling and grinding for 2min to obtain the material for reducing the freezing point of the asphalt pavement.
Wherein the particle size distribution of the milled powder is as follows: according to the weight percentage, the particle size is less than 100 percent of 0.6mm, 90-100 percent of the particle size is less than 0.15mm, and 70-100 percent of the particle size is less than 0.075 mm.
Example 5
This example provides a material for reducing the freezing point of asphalt pavement, and the specific embodiment is the same as example 2, except that the inorganic porous carrier is diatomaceous earth which is not pretreated.
Example 6
This example provides a material for reducing the freezing point of asphalt pavement, and the specific embodiment is the same as example 2, except that cyclohexanone is not added.
Comparative example 1
The comparative example provides a material for reducing the freezing point of an asphalt pavement, which comprises 60 parts of calcium chloride, 100 parts of water and 40 parts of diatomite according to parts by weight;
pretreatment of diatomite: calcining 300-mesh original diatomite at 395 ℃ for 4 hours to obtain primary diatomite, carrying out impregnation treatment on the primary diatomite at 78 ℃ for 2 hours by using 20% sulfuric acid solution to obtain secondary diatomite, carrying out impregnation treatment on the secondary diatomite at 70 ℃ by using 5% sodium hydroxide solution for 7 minutes, and carrying out suction filtration, washing and drying to obtain tertiary diatomite;
the preparation method comprises the following steps: dissolving calcium chloride in water, adding tertiary diatomite, stirring for 30min, drying at 105 ℃ for 12h, cooling to room temperature, and grinding into powder.
Performance testing
1. Time of slow release
Taking the time for which the conductivity reaches balance as the slow release time of the materials, taking 1g of the materials prepared in examples 1-8 and comparative example 1, adding into 150ml of distilled water, stirring to form a solution, inserting a conductive electrode and a temperature electrode of a conductivity meter into the solution, and respectively testing the conductivity and the slow release time of the materials in examples 1-8 and comparative example 1, wherein the results are shown in Table 1.
TABLE 1
| Numbering device | Conductivity/ms cm -1 | Sustained release time/min |
| Example 1 | 6.25 | 10 |
| Example 2 | 6.30 | 11 |
| Example 3 | 6.73 | 12 |
| Example 4 | 6.84 | 12 |
| Example 5 | 6.02 | 6 |
| Example 6 | 6.11 | 14 |
| Comparative example 1 | 6.29 | 3 |
As can be seen from the test results in Table 1, the specific coating material is used to coat the calcium chloride adsorbed by the porous carrier, so that the slow release time of the materials prepared in examples 1-4 is obviously prolonged compared with that of the uncoated material in comparative example 1, the diatomite in example 5 has a better slow release effect, and the diatomite is not pretreated, so that less calcium chloride is adsorbed, namely the slow release time is shortened; the coating material adopted in example 6 is not added with cyclohexanone, so that the slow release time is prolonged compared with that of example 2, namely, the slow release effect is improved, and meanwhile, the release of the active ingredient of calcium chloride is slower, so that the speed of melting snow and removing ice is slower.
2. Ice melting rate
(1) Ice melting rate at-5 deg.c
The material prepared in example 4 is mixed into asphalt mixture according to the mass percentage of 6%, and is stirred uniformly to prepare a Marshall test piece which is marked as a test piece 1;
preparing a Marshall test piece from the asphalt mixture without the material, and marking the Marshall test piece as a test piece 2;
40g of water is frozen into ice blocks for standby at the temperature of minus 18 ℃, marshall test pieces 1 and 2 are placed at the temperature of minus 5 ℃ for 4 hours, ice blocks are taken out, weighed rapidly, and kept at the temperature of minus 5 ℃ for 2 hours, 24 hours, 48 hours and 72 hours, the ice blocks are taken out and weighed immediately, and the ratio of the difference of the weight of the ice blocks before and after the ice blocks to the initial weight of the ice blocks is the ice melting rate of the material at the temperature of minus 5 ℃, and the test results are shown in Table 2.
TABLE 2
(2) Ice melting rate at-10 deg.c
The material prepared in example 4 is mixed into asphalt mixture according to the mass percentage of 6%, and is stirred uniformly to prepare a Marshall test piece which is marked as a test piece 1;
preparing a Marshall test piece from the asphalt mixture without the material, and marking the Marshall test piece as a test piece 2;
40g of water is frozen into ice blocks for standby at the temperature of minus 18 ℃, marshall test pieces 1 and 2 are placed at the temperature of minus 10 ℃ for 4 hours, ice blocks are taken out, weighed rapidly, and kept at the temperature of minus 10 ℃ for 2 hours, 24 hours, 48 hours and 72 hours, the ice blocks are taken out and weighed immediately, and the ratio of the difference of the weight of the ice blocks before and after the ice blocks to the initial weight of the ice blocks is the ice melting rate of the material at the temperature of minus 10 ℃, and the test results are shown in Table 3.
TABLE 3 Table 3
As can be seen from tables 2 and 3, the Marshall test piece added with the material has a larger ice melting rate than the Marshall test piece not added with the material, which indicates that the material has a good ice and snow melting effect.
3. Road surface deicing effect
The material in the embodiment 4 of the invention is mixed into asphalt mixture according to the mass percentage of 6%, and is uniformly stirred to prepare a rutting test piece which is counted as a test piece 3;
preparing a rutting test piece from an asphalt mixture which is not doped with the freezing point reduction material, wherein the rutting test piece is a test piece 4;
sprinkling water on the surfaces of the rut test pieces 3 and 4 respectively, then putting the test pieces in a low-temperature incubator at-5 ℃ for freezing for 8 hours, and the test results show that the surface of the rut test piece added with the material is not frozen, and the surface of the rut test piece not added with the material is provided with an obvious ice layer.
The temperature of the low-temperature constant-temperature box is sequentially adjusted to be-10 ℃, -8 ℃, -2 ℃ and 0 ℃ to detect whether the rutting test pieces 3 and 4 with the water sprayed on the surfaces are frozen or not in the corresponding temperature environments, the test steps are the same, and the test results show that the rutting test pieces with the materials are not frozen on the surfaces, and the rutting test pieces without the materials are obviously ice-layered on the surfaces.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and all such modifications and equivalents are intended to be encompassed in the scope of the claims of the present invention.
Claims (3)
1. The material for reducing the freezing point of the asphalt pavement is characterized by comprising the following raw materials in parts by weight: 55-85 parts of chloride, 90-120 parts of water, 20-40 parts of inorganic porous carrier, 9-17 parts of coating material, 15-30 parts of coupling agent diluent and 1-5 parts of slow release auxiliary agent;
the chloride comprises at least one of sodium chloride, magnesium chloride and calcium chloride;
the inorganic porous carrier is diatomite, the diatomite is pretreated diatomite, and the pretreatment steps comprise: calcining original diatomite for 4 hours at 395 ℃ to obtain primary diatomite, carrying out impregnation treatment on the primary diatomite at 78 ℃ for 2 hours by using a 20% sulfuric acid solution to obtain secondary diatomite, carrying out impregnation treatment on the secondary diatomite at 70 ℃ by using a 5% sodium hydroxide solution for 7 minutes, and carrying out suction filtration, washing and drying to obtain tertiary diatomite;
the coating material comprises modified epoxy resin and a curing agent, wherein the weight ratio of the modified epoxy resin to the curing agent is (3-4): 1, the curing agent is curing agent D230;
the preparation method of the modified epoxy resin comprises the following steps: mixing F-51 phenolic epoxy resin and ethylene glycol diglycidyl ether according to a weight ratio of 1:0.35, preserving heat for 12min, heating to 68 ℃, adding diethanolamine, reacting for 2.5h, cooling, adding acetic acid for neutralization, and adding deionized water equivalent to the F-51 phenolic epoxy resin for dilution to obtain the modified epoxy resin;
the epoxy equivalent of the F-51 phenolic epoxy resin is (0.5-0.58) eq/100g, and the weight ratio of diethanolamine to epoxy resin is 1:5.4, the consumption of acetic acid is 45wt% of the consumption of diethanolamine;
the coupling agent diluent is a mixed solution of a coupling agent and absolute ethyl alcohol, and the weight ratio of the coupling agent to the absolute ethyl alcohol is 1 (7-10);
the slow release auxiliary agent is cyclohexanone;
the preparation method of the material for reducing the freezing point of the asphalt pavement comprises the following steps:
s1, dissolving chloride in water, adding an inorganic porous carrier, stirring for 20-40min, and then drying and grinding to obtain a mixture A;
s2, adding the coupling agent diluent and the coating material into the mixture A obtained in the step S1, forming a layer of coating on the surface of the mixture A, and then drying, cooling and grinding to obtain the material for reducing the freezing point of the asphalt pavement.
2. The asphalt pavement freezing point-lowering material of claim 1, wherein the coupling agent comprises at least one of a phosphate coupling agent, a titanate coupling agent, and a silane coupling agent.
3. The asphalt pavement freezing point depressing material according to claim 1, wherein the particle size distribution of the asphalt pavement freezing point depressing material is as follows: according to the weight percentage, the particle size is less than 100 percent of 0.6mm, 90-100 percent of the particle size is less than 0.15mm, and 70-100 percent of the particle size is less than 0.075 mm.
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