CN116410695A - Polyurethane modified epoxy asphalt caulking material and preparation method thereof - Google Patents
Polyurethane modified epoxy asphalt caulking material and preparation method thereof Download PDFInfo
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- CN116410695A CN116410695A CN202310398317.4A CN202310398317A CN116410695A CN 116410695 A CN116410695 A CN 116410695A CN 202310398317 A CN202310398317 A CN 202310398317A CN 116410695 A CN116410695 A CN 116410695A
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- 239000010426 asphalt Substances 0.000 title claims abstract description 129
- 239000000463 material Substances 0.000 title claims abstract description 68
- 239000004593 Epoxy Substances 0.000 title claims abstract description 60
- 229920002635 polyurethane Polymers 0.000 title claims abstract description 57
- 239000004814 polyurethane Substances 0.000 title claims abstract description 57
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000003822 epoxy resin Substances 0.000 claims abstract description 40
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 40
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 28
- 229920001730 Moisture cure polyurethane Polymers 0.000 claims abstract description 27
- 150000008064 anhydrides Chemical class 0.000 claims abstract description 11
- 238000003756 stirring Methods 0.000 claims description 35
- 239000003607 modifier Substances 0.000 claims description 27
- 239000002202 Polyethylene glycol Substances 0.000 claims description 19
- 229920001223 polyethylene glycol Polymers 0.000 claims description 19
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical group CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 14
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 claims description 13
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 239000002131 composite material Substances 0.000 claims description 11
- 238000004321 preservation Methods 0.000 claims description 11
- 239000003208 petroleum Substances 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 9
- 239000011159 matrix material Substances 0.000 claims description 8
- FUIQBJHUESBZNU-UHFFFAOYSA-N 2-[(dimethylazaniumyl)methyl]phenolate Chemical group CN(C)CC1=CC=CC=C1O FUIQBJHUESBZNU-UHFFFAOYSA-N 0.000 claims description 7
- VYKXQOYUCMREIS-UHFFFAOYSA-N methylhexahydrophthalic anhydride Chemical group C1CCCC2C(=O)OC(=O)C21C VYKXQOYUCMREIS-UHFFFAOYSA-N 0.000 claims description 7
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical group O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 230000032683 aging Effects 0.000 abstract description 13
- 238000006073 displacement reaction Methods 0.000 abstract description 4
- 150000001875 compounds Chemical class 0.000 description 14
- 230000002238 attenuated effect Effects 0.000 description 6
- 239000004567 concrete Substances 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 238000002156 mixing Methods 0.000 description 3
- 229920001296 polysiloxane Polymers 0.000 description 3
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 2
- 239000004721 Polyphenylene oxide Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 150000001412 amines Chemical class 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 229920000570 polyether Polymers 0.000 description 2
- 229920001021 polysulfide Polymers 0.000 description 2
- 239000005077 polysulfide Substances 0.000 description 2
- 150000008117 polysulfides Polymers 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- JOLVYUIAMRUBRK-UHFFFAOYSA-N 11',12',14',15'-Tetradehydro(Z,Z-)-3-(8-Pentadecenyl)phenol Natural products OC1=CC=CC(CCCCCCCC=CCC=CCC=C)=C1 JOLVYUIAMRUBRK-UHFFFAOYSA-N 0.000 description 1
- YLKVIMNNMLKUGJ-UHFFFAOYSA-N 3-Delta8-pentadecenylphenol Natural products CCCCCCC=CCCCCCCCC1=CC=CC(O)=C1 YLKVIMNNMLKUGJ-UHFFFAOYSA-N 0.000 description 1
- JOLVYUIAMRUBRK-UTOQUPLUSA-N Cardanol Chemical compound OC1=CC=CC(CCCCCCC\C=C/C\C=C/CC=C)=C1 JOLVYUIAMRUBRK-UTOQUPLUSA-N 0.000 description 1
- FAYVLNWNMNHXGA-UHFFFAOYSA-N Cardanoldiene Natural products CCCC=CCC=CCCCCCCCC1=CC=CC(O)=C1 FAYVLNWNMNHXGA-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229940010698 activated attapulgite Drugs 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- -1 airport runways Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- PTFIPECGHSYQNR-UHFFFAOYSA-N cardanol Natural products CCCCCCCCCCCCCCCC1=CC=CC(O)=C1 PTFIPECGHSYQNR-UHFFFAOYSA-N 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000010622 cold drawing Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 231100001231 less toxic Toxicity 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J195/00—Adhesives based on bituminous materials, e.g. asphalt, tar, pitch
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/08—Macromolecular additives
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Polyurethanes Or Polyureas (AREA)
Abstract
The invention provides a polyurethane modified epoxy asphalt caulking material and a preparation method thereof, wherein the material comprises a component A and a component B, wherein the component A comprises 5-30 parts of polyurethane prepolymer and 10-100 parts of epoxy resin by weight; the component B comprises 10-200 parts of modified asphalt, 5-30 parts of compatibilizer, 30-125 parts of anhydride curing agent and 1-10 parts of accelerator; after the preparation, the polyurethane modified epoxy asphalt caulking material has no damage to the stretching adhesion under various states (23 ℃, -20 ℃ and aging treatment), has good displacement capability, the size of the caulking material can follow the deformation of an expansion joint to occur, the caulking material and an adhesion surface can not be damaged, and has good interface adhesion performance and aging resistance.
Description
Technical Field
The invention belongs to the field of building materials, and particularly relates to a polyurethane modified epoxy asphalt caulking material and a preparation method thereof.
Background
In order to adapt to the deformation of the concrete structure at different temperatures, the continuous pouring structure of the foundation plate, the track slab, the closed layer and the like of the ballastless track needs to be provided with joints (the width is 2-3 cm) at intervals. At the same time, there is also a seam (width 1-2 cm) between the base/support layer and the off-line structure. The problems of debonding, cracking and aging, waterproof failure and the like caused by failure of the caulking material can cause huge economic loss and a plurality of social problems due to huge one-time investment and high repair cost of the track engineering, so the requirement on the caulking material cannot be ignored. The caulking materials of the ballastless track of the high-speed railway which are put into operation at present mainly comprise asphalt, polysulfide, polyurethane, silicone and the like, wherein the polysulfide caulking materials are easy to cause environmental pollution, the asphalt caulking materials have low price, but the construction process is more complex, the construction is required under the heating condition, the adaptability to temperature is weaker, the materials are brittle at low temperature and easy to flow at high temperature, and the two materials are gradually replaced by the polyurethane or silicone caulking materials at present. Most of polyurethane caulking materials are packed in double components, and are mixed and cured after being weighed on site, so that the materials are not cured or the performance after curing can not meet the requirements easily due to metering errors or uneven mixing, and the raw materials also have toxicity; the silicone caulking material has high cost, the solidification of the caulking material is influenced by the water content of air and the depth of structure, and the bonding performance with a concrete interface is insufficient. Therefore, ideal ballastless track caulking materials for high-speed railways are urgently needed.
The epoxy asphalt is a solidified product of an irreversible three-dimensional interpenetrating network structure formed by preparing and processing epoxy resin, a curing agent and matrix asphalt according to a certain proportion. The cured epoxy asphalt has high strength, super strong adhesive property, excellent permanent deformation capability, fatigue resistance and chemical corrosion resistance. However, in a low-temperature environment, the epoxy asphalt material becomes hard and brittle and then cracks, and cracks appear, so that the epoxy asphalt material is accelerated to be damaged under the action of various loads and environments, and diseases with larger area are formed. The isocyanate-terminated polyurethane can react with the epoxy resin, so that the fracture toughness of the epoxy asphalt is greatly improved, and the low-temperature performance of the epoxy asphalt is improved. The epoxy asphalt modified by polyurethane has wide prospect as a high-speed rail caulking material.
For polyurethane modified epoxy asphalt material, CN202111086640.5 provides a thermosetting polyurethane modified epoxy asphalt material for steel bridge surfaces. The modified asphalt is modified by adopting a compound curing agent obtained by mixing polyether amine and cardanol, and then polyurethane modified epoxy resin is added into the modified asphalt. CN202111218337.6 provides a composite modified asphalt and a mixture of epoxy resin rubber powder, wherein the polyurethane modified epoxy resin is modified by adopting polyurethane prepolymer prepared from toluene diisocyanate and ethylenediamine polyether, and then the modified asphalt is added into the rubber powder modified asphalt to obtain the composite modified asphalt. CN202010569980.2 is obtained from polyurethane prepolymer modified epoxy resin prepared from diphenylmethane diisocyanate and ethylenediamine which are less toxic on polyurethane modified epoxy resin materials, and added to acid activated attapulgite modified asphalt. 202110293824.2A polyurethane modified epoxy asphalt steel bridge deck repairing material adopts modified epoxy resin mixed by EPU and EPD, amine curing agent is added to obtain compound epoxy resin, and then the compound epoxy resin is added into asphalt. However, the polyurethane modified epoxy asphalt material has a large low-temperature modulus, and cannot meet the deformation requirement of the expansion joint of the ballastless track of the high-speed railway.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a polyurethane modified epoxy asphalt caulking material with high displacement capacity, good interface cohesiveness, good aging resistance and proper cost.
In order to achieve the above object, the present invention provides the following technical solutions: the composite material comprises a component A and a component B, wherein the weight ratio of the component A to the component B is 1:2 to 6; wherein the component A comprises 5 to 30 parts of polyurethane prepolymer and 10 to 100 parts of epoxy resin by weight; the component B comprises 10 to 200 parts of modified asphalt, 5 to 30 parts of compatibilizer, 30 to 125 parts of anhydride curing agent and 1 to 10 parts of accelerator; the modifier is maleic anhydride; the compatibilizer is dimethylbenzene; the anhydride curing agent is methyl hexahydrophthalic anhydride; the promoter is dimethylaminomethyl phenol.
The polyurethane modified epoxy asphalt caulking material is characterized in that the polyurethane prepolymer is a mixture of diphenylmethane diisocyanate and polyethylene glycol.
The polyurethane modified epoxy asphalt caulking material comprises, by mass, 3-16 parts of diphenylmethane diisocyanate and 2-14 parts of polyethylene glycol.
The polyurethane modified epoxy asphalt caulking material is prepared by mixing petroleum asphalt and a modifier.
The polyurethane modified epoxy asphalt caulking material comprises, by mass, 10-200 parts of petroleum asphalt and 1-10 parts of a modifier.
The invention further aims to provide a preparation method of the polyurethane modified epoxy asphalt caulking material, which comprises the following steps:
(1) After polyethylene glycol is dehydrated in vacuum, the polyethylene glycol is dripped into diphenylmethane diisocyanate at 50-60 ℃, the temperature is evenly raised to 80-90 ℃, and the polyurethane prepolymer is obtained after the reaction is carried out for 3-4 hours with heat preservation and stirring.
(2) Taking polyurethane prepolymer and epoxy resin to react for 2-3 hours at 80-100 ℃ and a rotating speed of 300-400 r/min, thus obtaining modified epoxy resin.
(3) Heating matrix asphalt to 140-150 ℃, preserving heat, stirring at 500-600 r/min, adding modifier in batches within 30min, and continuing stirring for reaction for 1h to obtain modified asphalt.
(4) And (3) maintaining the temperature of the modified asphalt at 140-150 ℃ and at the rotating speed of 500-600 r/min, sequentially adding the curing agent, the compatibilizer and the accelerator, stirring for 2h, adding the modified epoxy resin, and stirring for 20min to obtain the composite modified asphalt.
The beneficial effects are that:
the polyurethane modified epoxy asphalt caulking compound prepared by the invention has no damage to the stretching adhesiveness in various states (23 ℃, -20 ℃ and aging treatment), which indicates that the polyurethane modified epoxy asphalt caulking compound prepared by the invention has good displacement capability, the size of the caulking compound can follow the deformation of an expansion joint, the caulking compound and a bonding surface can not be damaged, and the polyurethane modified epoxy asphalt caulking compound has good interface bonding property and aging resistance.
Detailed Description
The invention is further illustrated by the following examples. These examples are intended to illustrate the invention only and are not intended to limit the scope of the invention.
Example 1
The polyurethane modified epoxy asphalt material comprises a component A and a component B, wherein the component A comprises the following components in parts by weight: 20 parts of a polyurethane prepolymer of the component A and 50 parts of epoxy resin; 72 parts of modified asphalt of the component B, 23 parts of compatibilizer, 80 parts of anhydride curing agent and 5 parts of accelerator. A. The weight ratio of the component B to the component B is 1:2.29.
In the components, the compatibilizer is dimethylbenzene, the curing agent is methyl hexahydrophthalic anhydride, the accelerator is dimethylamino methylphenol, the modified asphalt material is a mixture of 33 parts of petroleum asphalt and 2 parts of modifier, wherein the modifier is maleic anhydride.
The preparation method of the polyurethane modified epoxy asphalt material comprises the following steps:
(1) And (3) after polyethylene glycol is dehydrated in vacuum, dropwise adding the dehydrated polyethylene glycol into diphenylmethane diisocyanate at 50 ℃, uniformly heating to 80 ℃, and carrying out heat preservation and stirring reaction for 3 hours to obtain the polyurethane prepolymer.
(2) Taking 20 parts of polyurethane prepolymer and 50 parts of epoxy resin, and carrying out heat preservation reaction for 2 hours at 80 ℃ and a rotating speed of 350r/min to obtain the modified epoxy resin.
(3) And heating the matrix asphalt to 140 ℃, preserving the heat, stirring at 500r/min, adding the modifier in batches within 30min to ensure that the modifier and the asphalt react sufficiently, and then continuing stirring and reacting for 1h to obtain the modified asphalt.
(4) And (3) maintaining 72 parts of modified asphalt at 140 ℃ and at a rotating speed of 500r/min, sequentially adding 80 parts of curing agent, 23 parts of compatibilizer and 5 parts of accelerator, stirring for 2 hours, adding modified epoxy resin, and stirring for 20 minutes to obtain the composite modified asphalt.
Example 2
The polyurethane modified epoxy asphalt material comprises a component A and a component B, wherein the component A comprises the following components in parts by weight: 25 parts of a polyurethane prepolymer of the component A and 58 parts of epoxy resin; 80 parts of modified asphalt of the component B, 24 parts of compatibilizer, 110 parts of anhydride curing agent and 6 parts of accelerator. A. The weight ratio of the two components is 1:2.65.
In the components, the compatibilizer is dimethylbenzene, the curing agent is methyl hexahydrophthalic anhydride, the accelerator is dimethylamino methylphenol, the modified asphalt material is a mixture of 33 parts of petroleum asphalt and 2 parts of modifier, wherein the modifier is maleic anhydride.
The preparation method of the polyurethane modified epoxy asphalt material comprises the following steps:
(1) And (3) after polyethylene glycol is dehydrated in vacuum, dropwise adding the dehydrated polyethylene glycol into diphenylmethane diisocyanate at 50 ℃, uniformly heating to 80 ℃, and carrying out heat preservation and stirring reaction for 3 hours to obtain the polyurethane prepolymer.
(2) Taking 25 parts of polyurethane prepolymer and 58 parts of epoxy resin, and carrying out heat preservation reaction for 2 hours at 80 ℃ and a rotating speed of 350r/min to obtain the modified epoxy resin.
(3) And heating the matrix asphalt to 140 ℃, preserving the heat, stirring at 500r/min, adding the modifier in batches within 30min to ensure that the modifier and the asphalt react sufficiently, and then continuing stirring and reacting for 1h to obtain the modified asphalt.
(4) And (3) maintaining 80 parts of modified asphalt at 140 ℃ and at a rotating speed of 500r/min, sequentially adding 110 parts of curing agent, 24 parts of compatibilizer and 6 parts of accelerator, stirring for 2 hours, adding modified epoxy resin, and stirring for 20 minutes to obtain the composite modified asphalt.
Example 3
The polyurethane modified epoxy asphalt material comprises a component A and a component B, wherein the component A comprises the following components in parts by weight: 15 parts of a polyurethane prepolymer of the component A and 30 parts of epoxy resin; 60 parts of modified asphalt of the component B, 21 parts of compatibilizer, 72 parts of anhydride curing agent and 3 parts of accelerator. A. The weight ratio of the component B to the component B is 1:3.47.
In the components, the compatibilizer is dimethylbenzene, the curing agent is methyl hexahydrophthalic anhydride, the accelerator is dimethylamino methylphenol, the modified asphalt material is a mixture of petroleum asphalt and the modifying agent, and the modifying agent is maleic anhydride.
The preparation method of the polyurethane modified epoxy asphalt material comprises the following steps:
(1) And (3) after polyethylene glycol is dehydrated in vacuum, dropwise adding the dehydrated polyethylene glycol into diphenylmethane diisocyanate at 50 ℃, uniformly heating to 80 ℃, and carrying out heat preservation and stirring reaction for 3 hours to obtain the polyurethane prepolymer.
(2) 15 parts of polyurethane prepolymer and 30 parts of epoxy resin are taken to react at 80 ℃ for 2 hours at the rotating speed of 350r/min, so as to obtain the modified epoxy resin.
(3) And heating the matrix asphalt to 140 ℃, preserving the heat, stirring at 500r/min, adding the modifier in batches within 30min to ensure that the modifier and the asphalt react sufficiently, and then continuing stirring and reacting for 1h to obtain the modified asphalt.
(4) And (3) maintaining 60 parts of modified asphalt at 140 ℃ and at a rotating speed of 500r/min, sequentially adding 72 parts of curing agent, 21 parts of compatibilizer and 3 parts of accelerator, stirring for 2 hours, adding modified epoxy resin, and stirring for 20 minutes to obtain the composite modified asphalt.
Example 4
The polyurethane modified epoxy asphalt material comprises a component A and a component B, wherein the component A comprises the following components in parts by weight: 5 parts of a polyurethane prepolymer of the component A and 20 parts of epoxy resin; 35 parts of modified asphalt of the component B, 10 parts of compatibilizer, 40 parts of anhydride curing agent and 2 parts of accelerator. A. The weight ratio of the component B to the component B is 1:3.48.
In the components, the compatibilizer is dimethylbenzene, the curing agent is methyl hexahydrophthalic anhydride, the accelerator is dimethylamino methylphenol, the modified asphalt material is a mixture of 33 parts of petroleum asphalt and 2 parts of modifier, wherein the modifier is maleic anhydride.
The preparation method of the polyurethane modified epoxy asphalt material comprises the following steps:
(1) And (3) after polyethylene glycol is dehydrated in vacuum, dropwise adding the dehydrated polyethylene glycol into diphenylmethane diisocyanate at 50 ℃, uniformly heating to 80 ℃, and carrying out heat preservation and stirring reaction for 3 hours to obtain the polyurethane prepolymer.
(2) Taking 5 parts of polyurethane prepolymer and 20 parts of epoxy resin, and carrying out heat preservation reaction for 2 hours at 80 ℃ and 3500r/min rotating speed to obtain modified epoxy resin.
(3) And heating the matrix asphalt to 140 ℃, preserving the heat, stirring at 500r/min, adding the modifier in batches within 30min to ensure that the modifier and the asphalt react sufficiently, and then continuing stirring and reacting for 1h to obtain the modified asphalt.
(4) And (3) keeping 35 parts of modified asphalt at 140 ℃ and at a rotating speed of 500r/min, sequentially adding 40 parts of curing agent, 10 parts of compatibilizer and 2 parts of accelerator, stirring for 2 hours, adding modified epoxy resin, and stirring for 20 minutes to obtain the composite modified asphalt.
Example 5
The polyurethane modified epoxy asphalt material comprises a component A and a component B, wherein the component A comprises the following components in parts by weight: 7 parts of a polyurethane prepolymer of the component A and 16 parts of epoxy resin; 40 parts of modified asphalt of the component B, 14 parts of compatibilizer, 36 parts of anhydride curing agent and 3 parts of accelerator. A. The weight ratio of the component B to the component B is 1:4.04.
In the components, the compatibilizer is dimethylbenzene, the curing agent is methyl hexahydrophthalic anhydride, the accelerator is dimethylamino methylphenol, the modified asphalt material is a mixture of 33 parts of petroleum asphalt and 2 parts of modifier, and the modifier is acrylic acid.
The preparation method of the polyurethane modified epoxy asphalt material comprises the following steps:
(1) And (3) after polyethylene glycol is dehydrated in vacuum, dropwise adding the dehydrated polyethylene glycol into diphenylmethane diisocyanate at 50 ℃, uniformly heating to 80 ℃, and carrying out heat preservation and stirring reaction for 3 hours to obtain the polyurethane prepolymer.
(2) 7 parts of polyurethane prepolymer and 16 parts of epoxy resin are taken to react for 2 hours at 80 ℃ and a rotating speed of 350r/min, so as to obtain the modified epoxy resin.
(3) And heating the matrix asphalt to 140 ℃, preserving the heat, stirring at 500r/min, adding the modifier in batches within 30min to ensure that the modifier and the asphalt react sufficiently, and then continuing stirring and reacting for 1h to obtain the modified asphalt.
(4) And (3) maintaining 40 parts of modified asphalt at 140 ℃ and at a rotating speed of 500r/min, sequentially adding 36 parts of curing agent, 14 parts of compatibilizer and 3 parts of accelerator, stirring for 2 hours, adding modified epoxy resin, and stirring for 20 minutes to obtain the composite modified asphalt.
The technical index content of the test of the polyurethane modified epoxy asphalt caulking material in the implementation 1-5 is shown in the table 1, and the test is performed according to the working performance, the mechanical performance, the interface bonding performance, the ageing resistance and the fatigue resistance, wherein the tensile strength and the elongation at break are tested according to GB/T16777-2008; the set-stretch bond, cold-drawn hot-press bond, and stretch compression cycle bond were tested according to GB/T13477-2002. The technical indexes of the polyurethane modified epoxy asphalt are shown in the following table 1, and the test results are shown in the following table 2.
Table 1 technical index content of polyurethane modified epoxy asphalt caulking material
Table 2 test results of polyurethane modified epoxy asphalt caulk material
The test results in table 2 show that: the polyurethane modified epoxy asphalt caulking material prepared by the invention has the advantages that the holding time is more than or equal to 1h, the surface drying time is less than or equal to 12h, and the real drying time is less than or equal to 1d. The polyurethane modified epoxy asphalt caulking compound prepared by the method has the advantages that the curing speed is high, a surface dry can be formed in a short period, construction dust emission, personnel trampling and the like are prevented from being damaged, and the curing process of the polyurethane modified epoxy asphalt caulking compound prepared by the method is not interfered by external environment and has the property of stable curing time.
The polyurethane modified epoxy asphalt caulking material prepared by the invention has the tensile strength of 1.06MPa-1.20MPa and the breaking elongation of 140.23% -159.75% when the ambient temperature is 23 ℃; when the ambient temperature is-5 ℃, the tensile strength is 1.63MPa-1.82MPa, and the breaking elongation is 180.44% -193.29%; when the ambient temperature is minus 20 ℃, the tensile strength is 1.95MPa to 2.11MPa, and the breaking elongation is 240.42 percent to 254.32 percent; the epoxy asphalt caulking compound prepared by the invention has reasonable mechanical property, can bear certain tensile strength and has larger elongation at break; simultaneously, as the ambient temperature is reduced, the tensile strength and the elongation at break are both improved, and the expansion joint has better flexibility at low temperature so as to adapt to the deformation of the expansion joint.
The adhesive strength of the polyurethane modified epoxy asphalt caulking compound prepared by the invention is 0.64MPa-0.78MPa at 23 ℃, 0.96MPa-1.09MPa at-5 ℃ and 1.30MPa-1.42MPa at-20 ℃; when the ambient temperature is reduced from 23 ℃ to-20 ℃, the tensile strength is greatly improved, which proves that the epoxy asphalt caulk prepared by the invention has better bonding performance with a concrete interface, and the bonding performance is improved along with the reduction of the ambient temperature.
After the polyurethane modified epoxy asphalt caulking compound prepared by the invention is soaked for 192 hours, the tensile strength at 23 ℃ is attenuated by 8-11%, and the elongation at break at 23 ℃ is attenuated by 4-9%; after heat aging, the tensile strength at 23 ℃ is attenuated by 11-14%, and the elongation at break at 23 ℃ is attenuated by 4-9%; after ultraviolet aging, the tensile strength at 23 ℃ is attenuated by 6-7%, and the elongation at break at 23 ℃ is attenuated by 6-12%, which shows that the aging has a certain influence on the epoxy asphalt caulk prepared by the method. The maximum attenuation of the aging to the tensile strength at 23 ℃ is 14 percent, the maximum attenuation to the elongation at break is 12 percent, and the aging is in the normal attenuation range. This shows that the epoxy asphalt caulking compound prepared by the invention has good ageing resistance.
The adhesiveness of the polyurethane modified epoxy asphalt caulking material prepared by the invention after cold drawing and hot pressing and the adhesiveness after stretching and compression cycle are not damaged, which indicates that the polyurethane modified epoxy asphalt caulking material prepared by the invention has good fatigue resistance.
The invention relates to a polyurethane modified epoxy asphalt caulking material and a preparation method thereof, wherein the caulking material comprises the following raw materials in parts by weight: the component A comprises 5 to 30 parts of polyurethane prepolymer and 10 to 100 parts of epoxy resin; the component B comprises 10 to 200 parts of modified asphalt, 5 to 30 parts of compatibilizer, 30 to 125 parts of anhydride curing agent and 1 to 10 parts of accelerator. The polyurethane modified epoxy asphalt caulking material is prepared by the preparation method provided by the invention. The polyurethane epoxy asphalt caulking material has the characteristics of simple construction, stable solidification, good displacement capability, strong interface cohesiveness, good durability, proper cost and the like, and is suitable for the expansion joints of high-speed railway ballastless track concrete, airport runways, cement concrete pavement expansion joints and the like.
Claims (6)
1. A polyurethane modified epoxy asphalt caulking material is characterized in that: the composite material comprises a component A and a component B, wherein the weight ratio of the component A to the component B is 1: 2-6; the component A comprises 5-30 parts of polyurethane prepolymer and 10-100 parts of epoxy resin by weight; the component B comprises 10-200 parts of modified asphalt, 5-30 parts of compatibilizer, 30-125 parts of anhydride curing agent and 1-10 parts of accelerator;
the modifier is maleic anhydride; the compatibilizer is dimethylbenzene; the anhydride curing agent is methyl hexahydrophthalic anhydride; the promoter is dimethylaminomethyl phenol.
2. The polyurethane modified epoxy asphalt caulking material according to claim 1, characterized in that: the polyurethane prepolymer is a mixture of diphenylmethane diisocyanate and polyethylene glycol.
3. The polyurethane modified epoxy asphalt caulking material according to claim 2, characterized in that: the mixed mass parts of the diphenylmethane diisocyanate and the polyethylene glycol are 3-16 parts of the diphenylmethane diisocyanate and 2-14 parts of the polyethylene glycol.
4. The polyurethane modified epoxy asphalt caulking material according to claim 1, characterized in that: the modified asphalt material is a mixture of petroleum asphalt and a modifier.
5. The polyurethane modified epoxy asphalt caulking material according to claim 4, characterized in that: the petroleum asphalt and the modifier are mixed in parts by weight of 10-200 parts of petroleum asphalt and 1-10 parts of modifier.
6. The method for preparing the polyurethane modified epoxy asphalt caulking material according to any one of claims 1 to 5, which is characterized in that: the preparation method comprises the following steps:
(1) After polyethylene glycol is dehydrated in vacuum, dropwise adding the dehydrated polyethylene glycol into diphenylmethane diisocyanate at 50-60 ℃, uniformly heating to 80-90 ℃, and carrying out heat preservation and stirring reaction for 3-4 hours to obtain a polyurethane prepolymer;
(2) Taking polyurethane prepolymer and epoxy resin, and carrying out heat preservation reaction for 2-3 hours at the temperature of 80-100 ℃ and the rotating speed of 300-400 r/min to obtain modified epoxy resin;
(3) Heating matrix asphalt to 140-150 ℃, preserving heat, stirring at 500-600 r/min, adding a modifier in batches within 30min, and continuing stirring for reacting for 1h to obtain modified asphalt;
and (3) maintaining the temperature of the modified asphalt at 140-150 ℃ and sequentially adding a curing agent, a compatibilizer and an accelerator at the rotating speed of 500-600 r/min, stirring, adding modified epoxy resin, and stirring to obtain the composite modified asphalt.
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| CN202310398317.4A CN116410695A (en) | 2023-04-14 | 2023-04-14 | Polyurethane modified epoxy asphalt caulking material and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117165033A (en) * | 2023-09-08 | 2023-12-05 | 湖南瑞弗斯科技发展有限公司 | Epoxy asphalt modified material for asphalt pavement repair |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117165033A (en) * | 2023-09-08 | 2023-12-05 | 湖南瑞弗斯科技发展有限公司 | Epoxy asphalt modified material for asphalt pavement repair |
| CN117165033B (en) * | 2023-09-08 | 2024-04-26 | 湖南瑞弗斯科技发展有限公司 | Epoxy asphalt modified material for asphalt pavement repair |
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