CN114316613A - Bi-component thermosetting polyurethane modified asphalt with adjustable retention time and preparation thereof - Google Patents
Bi-component thermosetting polyurethane modified asphalt with adjustable retention time and preparation thereof Download PDFInfo
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- CN114316613A CN114316613A CN202111541755.9A CN202111541755A CN114316613A CN 114316613 A CN114316613 A CN 114316613A CN 202111541755 A CN202111541755 A CN 202111541755A CN 114316613 A CN114316613 A CN 114316613A
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- 239000010426 asphalt Substances 0.000 title claims abstract description 168
- 239000004814 polyurethane Substances 0.000 title claims abstract description 71
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- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 21
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 claims description 20
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- 239000002994 raw material Substances 0.000 claims description 14
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Abstract
The invention relates to a bi-component thermosetting polyurethane modified asphalt with adjustable retention time and a preparation method thereof, wherein the bi-component thermosetting polyurethane modified asphalt comprises the following substances in parts by mass: 100 parts of matrix asphalt, 0.3-5 parts of chain extension cross-linking agent, 20-110 parts of polyether polyol, 0-15 parts of diluent and 5-25 parts of isocyanate. The thermosetting polyurethane asphalt is a bi-component curing system, the component A is composed of base asphalt, a chain extension cross-linking agent, polyether polyol and a diluent, and the component B is isocyanate. The thermosetting polyurethane modifier can not only remarkably improve the high-temperature deformation resistance, low-temperature flexibility, bonding property and fatigue resistance of asphalt, but also regulate and control the construction retention time of the thermosetting polyurethane modified asphalt within 30-200 min by adjusting the composition of the modifier, and has the characteristics of low construction temperature, simple process, energy conservation, environmental protection and the like.
Description
Technical Field
The invention belongs to the technical field of modified asphalt preparation, and relates to bi-component thermosetting polyurethane modified asphalt with adjustable retention time and preparation thereof.
Background
The traditional polymer modified asphalt is mainly divided into thermoplastic polymer modified asphalt and thermosetting resin modified asphalt. Thermoplastic polymer modified asphalt (such as SBS modified asphalt, SBR modified asphalt, PE modified asphalt and the like) has thermal plasticity, is a viscoelastic material, is greatly influenced by temperature, has poor high-temperature deformation resistance, and is easy to generate diseases such as rutting, crowding and the like at high temperature. Thermosetting resin-modified asphalt such as representative epoxy asphalt. Although epoxy asphalt has many applications in road engineering due to its excellent high-temperature stability, mechanical strength, fatigue resistance and other characteristics. But the polymerization process of the epoxy asphalt is difficult to control, so that the construction holding time is difficult to control, and the construction conditions are harsh; meanwhile, it is brittle and has poor flexibility after curing. Particularly, when the temperature drops suddenly, the epoxy asphalt pavement material generally generates larger temperature stress due to larger modulus, and is easy to cause cracking diseases. Therefore, it is very important to develop a thermosetting resin modified asphalt cement with excellent performance and controllable retention time, which is suitable for road engineering.
The polyurethane has the advantages of flexible formula, excellent product performance, various forms, good mechanical strength, oxidation resistance, chemical stability resistance, high elasticity and the like, and is expected to be used as a novel asphalt modifier in road engineering.
Chinese patent CN108276789A discloses a preparation method of self-repairing thermosetting polyurethane asphalt. The novel thermosetting asphalt can be restored at a certain temperature after being damaged, and has a self-repairing and reprocessing function. The method is expected to solve the problem that the thermosetting asphalt material is not easy to recover and maintain, and can save a large amount of resources and maintenance cost.
Chinese patent CN110903665A discloses a bi-component polyurethane modified asphalt and a preparation method thereof. Wherein the component A is polyol, the component B is isocyanate, and the component A, B is mixed in proportion and added into the molten asphalt together with an external additive for shearing and mixing to obtain the polyurethane modified asphalt material. The prepared polyurethane modified asphalt has excellent high and low temperature performance, excellent stability and lower preparation temperature. Although the polyurethane asphalt can improve the road performance of the matrix asphalt to a certain extent, the polyurethane modifier is low in mixing amount and cannot form a network structure with certain strength in the asphalt, the prepared modified asphalt is still a thermoplastic material, and the temperature sensitivity is not fundamentally solved.
Chinese patent CN103102706A discloses a polyurethane type high temperature resistant and rutting resistant modifier for road asphalt. The modifier can greatly improve the high-temperature resistance and rutting resistance of the matrix asphalt and the modified asphalt, and the prepared modified asphalt has balanced high-temperature and low-temperature performance, good compatibility with the matrix asphalt and stable storage. However, the optimal addition amount of the modifier is 2-10 wt%, the prepared modified asphalt is still a thermoplastic material, and the improvement range of mechanical property and high-temperature deformation resistance is not large.
Disclosure of Invention
The invention aims to provide a bi-component thermosetting polyurethane modified asphalt with adjustable retention time and a preparation method thereof.
The purpose of the invention can be realized by the following technical scheme:
one of the technical schemes of the invention provides bi-component thermosetting polyurethane modified asphalt with adjustable retention time, which comprises two raw materials of a component A and a component B, wherein the component A comprises the following raw material components in parts by weight: 100 parts of matrix asphalt, 0.3-5 parts of chain extension cross-linking agent, 20-110 parts of polyether polyol and 0-15 parts of diluent (namely solvent);
the component B comprises 5-25 parts of isocyanate. When the amount of the diluent added is 0, it means that it is not added, and it is preferable that the diluent is not 0.
In the polyurethane modified asphalt system, the addition amount of the thermosetting polyurethane modifier is 20-60 wt% relative to the modified asphalt system, and the preferable addition amount is 30-50 wt%. The thermosetting polyurethane modifier system comprises polyether polyol, isocyanate and a chain extender.
Further, the isocyanate is selected from hexamethylene diisocyanate and at least one of biuret and trimer derivatives thereof.
Further, the chain-extending cross-linking agent is one or two or more of 1, 4-butanediol, ethylene glycol, glycerol and 1, 6-hexanediol.
Further, the polyether polyol is one or a combination of several of polyoxyethylene glycol, polyoxypropylene glycol and polytetrahydrofuran glycol with the number average molecular weight of 1000-4000.
Further, the diluent is one or a mixture of more of ethyl acetate, butyl acetate and dimethylformamide.
Further, the matrix asphalt is 70# or 90# petroleum asphalt.
The reaction of the polyurethane modifier in this patent mainly involves the reaction of the-NCO group in the isocyanate with the hydroxyl (-OH) groups in the chain extender and the polyether polyol. Isocyanate and a chain extension cross-linking agent in a polyurethane system are used as hard segments to play a role in controlling the mechanical property of polyurethane (the hard segment content is higher, the mechanical property is better), polyether polyol is used as a soft segment to play a role in controlling the low-temperature flexibility of polyurethane (the soft segment content is higher, the low-temperature flexibility is better), and polyurethane modifiers with different structures finally influence the property of polyurethane modified asphalt. The polyurethane modifier has low viscosity at high temperature, and can obviously reduce the initial viscosity of the matrix asphalt, so that the system can be constructed at low temperature. In addition, reactant concentration is a major factor affecting the rate of reaction, ultimately affecting the rate of viscosity increase. At the same time, the diluent also acts to reduce the concentration of the reactants, ultimately reducing the rate of viscosity increase. The key technology of the invention is to regulate and control the reaction rate by adjusting the proportion of polyurethane modifier reactant and the mixing amount of diluent in the system, and control the change of viscosity, thereby achieving the purpose of regulating and controlling the construction retention time.
The second technical scheme of the invention provides a preparation method of bi-component thermosetting polyurethane modified asphalt with adjustable retention time, which comprises the following steps:
(1) weighing the matrix asphalt, the chain extension cross-linking agent, the polyether polyol and the diluent according to the proportion, shearing and mixing to obtain a mixture serving as a component A, and weighing the isocyanate serving as a component B;
(2) respectively preheating the component A and the component B, then adding the component B into the component A, uniformly stirring to obtain a polyurethane mixture, and continuing to carry out curing treatment to obtain a target product.
Further, in the step (1), the shearing and mixing time is 100-120 ℃, the stirring speed is 1000-3000 rpm, and the time is 5-10 min.
Further, in the step (2), the component A is preheated to 100-120 ℃, and the component B is preheated to 60 ℃.
Further, in the step (3), the process conditions of the health preserving treatment are specifically as follows: curing at room temperature for 30d or at 100 ℃ for 7 h.
Compared with the prior art, the invention has the following advantages:
(1) road performance enhancement
Compared with the traditional high polymer modified asphalt cementing agent, the invention adopts thermosetting polyether polyurethane with excellent flexibility as the cementing agent, thereby overcoming the defects of large temperature sensitivity, poor mechanical property and the like of the traditional cementing agent; in addition, the thermosetting polyurethane modifier has a lower glass transition temperature, and still has better flexibility at a lower temperature.
(2) Construction holding time can be regulated and controlled
Compared with epoxy asphalt cement, the invention controls the reaction rate of the thermosetting polyurethane modifier by changing the proportion of the polyurethane modifier, and can obtain the high-performance polyurethane modified asphalt cement suitable for construction retention time under different working conditions.
(3) Economy and environmental protection
In order to obtain lower construction viscosity, the traditional high polymer modified asphalt is often heated to a temperature of over 160 ℃, and the asphalt and the high polymer are accelerated to age under a high-temperature condition, so that the long-term service life of the pavement is finally shortened. The thermosetting polyurethane modified asphalt is a warm-mixed material, the mixing temperature is 100-120 ℃, and compared with a hot-mixed asphalt cementing material, the hot-mixed asphalt has higher construction temperature, the VOC emission is less, and the energy is saved and the environment is protected.
With the obvious increase of road traffic load and traffic volume, the use environment of the asphalt pavement is more severe, and the asphalt pavement is required to have more excellent pavement performance, including high-temperature stability, low-temperature crack resistance, mechanical properties and the like. The bi-component thermosetting polyurethane of the invention not only can meet the performance requirements, but also can prolong the service life of the pavement, and has higher economic benefit.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
In the following examples, unless otherwise specified, all the materials or treatments are conventional and commercially available materials or conventional treatment techniques in the art.
Example 1:
according to example 1 of the two-component thermosetting polyurethane modified asphalt provided by the invention, the following substances and the materials in parts by mass are contained, as shown in the following table 1:
TABLE 1
| Raw material | Base asphalt | Isocyanates | Chain-extending cross-linking agent | Polyether polyols | Solvent(s) |
| Mass portion of | 100 | 5 | 0.3 | 20 | 5 |
The base asphalt is 70# asphalt, the isocyanate is hexamethylene diisocyanate, the chain-extending cross-linking agent is glycerol, the polyether polyol is oxidized polyoxyethylene glycol with molecular weight of 2000, and the solvent is a mixture of ethyl acetate and butyl acetate (mass ratio is 4: 1).
The preparation method of the thermosetting polyurethane modified asphalt has the flow shown in figure 1, and comprises the following specific steps: 1) mixing 100 parts of matrix asphalt, 0.3 part of chain extension cross-linking agent, 20 parts of polyether polyol and 5 parts of diluent under high-speed shearing according to a ratio, wherein the shearing temperature is 110 ℃, the speed is 2000rpm, and the time is 7min, taking the mixture as a component A, and taking isocyanate as a component B; 2) preheating the component A to 110 ℃, and preheating the component B to 60 ℃; 3) adding 5 parts of the component B into the component A according to the proportion, and uniformly stirring at the stirring temperature of 110 ℃; 4) curing for 7h at 100 ℃ to finally obtain the high-performance thermosetting polyurethane modified asphalt.
After the above process flows, the road performance is tested by referring to "road engineering asphalt and asphalt mixture test procedure" (JTG E20-2011), which mainly includes: the holding time (the time when the viscosity of the system reaches 5000 mPas at 100 ℃), the low-temperature performance (-24 ℃ creep stiffness modulus, creep rate), and the high-temperature performance (64 ℃ elastic recovery rate, unrecoverable creep compliance). The tensile strength of the waterproof coating is tested by referring to the test method of the waterproof coating for buildings (GB/T16777-.
Example 2:
according to the embodiment 1 of the two-component thermosetting polyurethane modified asphalt provided by the invention, the following substances and the materials in parts by mass are contained, as shown in the following table 2:
TABLE 2
| Raw material | Base asphalt | Isocyanates | Chain-extending cross-linking agent | Polyether polyols | Solvent(s) |
| Mass portion of | 100 | 8 | 1 | 35 | 0 |
The base asphalt is 70# asphalt, the isocyanate is hexamethylene diisocyanate biuret, the chain extension crosslinking agent is a mixture of 1, 4-butanediol and ethylene glycol (the mass ratio is 1:1), the polyether polyol is a mixture of oxidized polyethylene glycol with the molecular weight of 1000 and polytetrahydrofuran glycol with the molecular weight of 3000 (the mass ratio is 1:1), and the solvent is not used.
The preparation method of the thermosetting polyurethane modified asphalt, with reference to the preparation process flow shown in example 1 and fig. 1, tests the road performance of the asphalt and asphalt mixture after standard cultivation by referring to test specification for road engineering asphalt and asphalt mixture (JTG E20-2011), and mainly comprises the following steps: the holding time (the time when the viscosity of the system reaches 5000 mPas at 100 ℃), the low-temperature performance (-24 ℃ creep stiffness modulus, creep rate), and the high-temperature performance (64 ℃ elastic recovery rate, unrecoverable creep compliance). The tensile strength of the waterproof coating is tested by referring to the test method of the waterproof coating for buildings (GB/T16777-.
Example 3
According to example 1 of the two-component thermosetting polyurethane modified asphalt provided by the invention, the following substances and the parts by mass of the materials are contained, as shown in the following table 3:
TABLE 3
| Raw material | Base asphalt | Isocyanates | Chain-extending cross-linking agent | Polyether polyols | Solvent(s) |
| Mass portion of | 100 | 12 | 2 | 50 | 5 |
The base asphalt is 90# asphalt, the isocyanate is hexamethylene diisocyanate trimer, the chain-extending cross-linking agent is a mixture of 1, 4-butanediol and 1, 6-ethanediol (the mass ratio is 2:1), the polyether polyol is a mixture of polyoxypropylene glycol with the molecular weight of 3000 and polytetrahydrofuran glycol with the molecular weight of 4000 (the mass ratio is 1:1), and the solvent is dimethylformamide.
The preparation method of the thermosetting polyurethane modified asphalt, with reference to the preparation process flow shown in example 1 and fig. 1, tests the road performance of the asphalt and asphalt mixture after standard cultivation by referring to test specification for road engineering asphalt and asphalt mixture (JTG E20-2011), and mainly comprises the following steps: the holding time (the time when the viscosity of the system reaches 5000 mPas at 100 ℃), the low-temperature performance (-24 ℃ creep stiffness modulus, creep rate), and the high-temperature performance (64 ℃ elastic recovery rate, unrecoverable creep compliance). The tensile strength of the waterproof coating is tested by referring to the test method of the waterproof coating for buildings (GB/T16777-.
Example 4
According to example 1 of the two-component thermosetting polyurethane modified asphalt provided by the invention, the following substances and the parts by mass of the materials are contained, as shown in the following table 4:
TABLE 4
| Raw material | Base asphalt | Isocyanates | Chain-extending cross-linking agent | Polyether polyols | Solvent(s) |
| Mass portion of | 100 | 12 | 2 | 50 | 10 |
The base asphalt is 90# asphalt, the isocyanate is hexamethylene diisocyanate trimer, the chain-extending cross-linking agent is 1, 4-butanediol, the polyether polyol is polyoxypropylene glycol with the molecular weight of 1000 and polytetrahydrofuran diol with the molecular weight of 3000 (the mass ratio is 1:1), and the solvent is butyl acetate and dimethylformamide (the mass ratio is 4: 1).
The preparation method of the thermosetting polyurethane modified asphalt, with reference to the preparation process flow shown in example 1 and fig. 1, tests the road performance of the asphalt and asphalt mixture after standard cultivation by referring to test specification for road engineering asphalt and asphalt mixture (JTG E20-2011), and mainly comprises the following steps: the holding time (the time when the viscosity of the system reaches 5000 mPas at 100 ℃), the low-temperature performance (-24 ℃ creep stiffness modulus, creep rate), and the high-temperature performance (64 ℃ elastic recovery rate, unrecoverable creep compliance). The tensile strength of the waterproof coating is tested by referring to the test method of the waterproof coating for buildings (GB/T16777-.
Example 5
According to example 1 of the two-component thermosetting polyurethane modified asphalt provided by the invention, the following substances and the parts by mass of the materials are contained, as shown in the following table 5:
TABLE 5
| Raw material | Base asphalt | Isocyanates | Chain-extending cross-linking agent | Polyether polyols | Solvent(s) |
| Mass portion of | 100 | 15 | 3 | 60 | 10 |
The base asphalt is 70# asphalt, the isocyanate is hexamethylene diisocyanate biuret, the chain extension crosslinking agent is a mixture (mass ratio is 1:1:1) of 1, 4-butanediol, ethylene glycol and 1, 6-hexanediol, the polyether polyol is a mixture (mass ratio is 2:1) of polyoxypropylene glycol with the molecular weight of 2000 and polytetrahydrofuran glycol with the molecular weight of 2000, and the solvent is a mixture (mass ratio is 3:1:1) of ethyl acetate, butyl acetate and dimethylformamide.
The preparation method of the thermosetting polyurethane modified asphalt, with reference to the preparation process flow shown in example 1 and fig. 1, tests the road performance of the asphalt and asphalt mixture after standard cultivation by referring to test specification for road engineering asphalt and asphalt mixture (JTG E20-2011), and mainly comprises the following steps: the holding time (the time when the viscosity of the system reaches 5000 mPas at 100 ℃), the low-temperature performance (-24 ℃ creep stiffness modulus, creep rate), and the high-temperature performance (64 ℃ elastic recovery rate, unrecoverable creep compliance). The tensile strength of the waterproof coating is tested by referring to the test method of the waterproof coating for buildings (GB/T16777-.
Example 6
The two-component thermosetting polyurethane modified asphalt provided by the invention in example 1 contains the following substances and the following materials in parts by mass as shown in the following table 6:
TABLE 6
| Raw material | Base asphalt | Isocyanates | Chain-extending cross-linking agent | Polyether polyols | Solvent(s) |
| Mass portion of | 100 | 18 | 3.5 | 80 | 0 |
The base asphalt is 90# asphalt, the isocyanate is hexamethylene diisocyanate trimer, the chain-extending cross-linking agent is 1,4 butanediol, the polyether polyol is a mixture of polyoxypropylene glycol with the molecular weight of 3000 and polytetrahydrofuran glycol with the molecular weight of 3000 (the mass ratio is 1:1), and the solvent is not used.
The preparation method of the thermosetting polyurethane modified asphalt, with reference to the preparation process flow shown in example 1 and fig. 1, tests the road performance of the asphalt and asphalt mixture after standard cultivation by referring to test specification for road engineering asphalt and asphalt mixture (JTG E20-2011), and mainly comprises the following steps: the holding time (the time when the viscosity of the system reaches 5000 mPas at 100 ℃), the low-temperature performance (-24 ℃ creep stiffness modulus, creep rate), and the high-temperature performance (64 ℃ elastic recovery rate, unrecoverable creep compliance). The tensile strength of the waterproof coating is tested by referring to the test method of the waterproof coating for buildings (GB/T16777-.
Example 7
The two-component thermosetting polyurethane modified asphalt provided by the invention in example 1 contains the following substances and the following materials in parts by mass as shown in the following table 7:
TABLE 7
| Raw material | Base asphalt | Isocyanates | Chain-extending cross-linking agent | Polyether polyols | Solvent(s) |
| Mass portion of | 100 | 18 | 4 | 80 | 15 |
The base asphalt is 90# asphalt, the isocyanate is hexamethylene diisocyanate trimer, the chain-extending cross-linking agent is a mixture of 1, 4-butanediol and 1, 6-hexanediol (the mass ratio is 2:1), the polyether polyol is a mixture of polyethylene glycol with the molecular weight of 1000 and polytetrahydrofuran diol with the molecular weight of 3000 (the mass ratio is 1:1), and the solvent is a mixture of ethyl acetate, butyl acetate and dimethylformamide (the mass ratio is 1:1: 1).
The preparation method of the thermosetting polyurethane modified asphalt, with reference to the preparation process flow shown in example 1 and fig. 1, tests the road performance of the asphalt and asphalt mixture after standard cultivation by referring to test specification for road engineering asphalt and asphalt mixture (JTG E20-2011), and mainly comprises the following steps: the holding time (the time when the viscosity of the system reaches 5000 mPas at 100 ℃), the low-temperature performance (-24 ℃ creep stiffness modulus, creep rate), and the high-temperature performance (64 ℃ elastic recovery rate, unrecoverable creep compliance). The tensile strength of the waterproof coating is tested by referring to the test method of the waterproof coating for buildings (GB/T16777-.
Example 8
The two-component thermosetting polyurethane modified asphalt provided by the invention in example 1 contains the following substances and the following materials in parts by mass as shown in the following table 8:
TABLE 8
| Raw material | Base asphalt | Isocyanates | Chain-extending cross-linking agent | Polyether polyols | Solvent(s) |
| Mass portion of | 100 | 22 | 4.5 | 100 | 10 |
The base asphalt is 70# asphalt, the isocyanate is hexamethylene diisocyanate biuret, the chain extension crosslinking agent is 1, 4-butanediol, the polyether polyol is a mixture (mass ratio is 1:1:1) of polyoxyethylene glycol with molecular weight of 2000, polyoxypropylene glycol with molecular weight of 2000 and polytetrahydrofuran glycol with molecular weight of 2000, and the solvent is ethyl acetate.
The preparation method of the thermosetting polyurethane modified asphalt, with reference to the preparation process flow shown in example 1 and fig. 1, tests the road performance of the asphalt and asphalt mixture after standard cultivation by referring to test specification for road engineering asphalt and asphalt mixture (JTG E20-2011), and mainly comprises the following steps: the holding time (the time when the viscosity of the system reaches 5000 mPas at 100 ℃), the low-temperature performance (-24 ℃ creep stiffness modulus, creep rate), and the high-temperature performance (64 ℃ elastic recovery rate, unrecoverable creep compliance). The tensile strength of the waterproof coating is tested by referring to the test method of the waterproof coating for buildings (GB/T16777-.
Example 9
The two-component thermosetting polyurethane modified asphalt provided by the invention in example 1 contains the following substances and the following materials in parts by mass as shown in the following table 9:
TABLE 9
| Raw material | Base asphalt | Isocyanates | Chain-extending cross-linking agent | Polyether polyols | Solvent(s) |
| Mass portion of | 100 | 22 | 5 | 100 | 15 |
The base asphalt is 90# asphalt, the isocyanate is hexamethylene diisocyanate trimer, the chain-extending cross-linking agent is 1,6 hexanediol, the polyether polyol is polyoxyethylene glycol with the molecular weight of 3000 and polytetrahydrofuran glycol with the molecular weight of 3000 (the mass ratio is 1:1), and the solvent is a mixture of ethyl acetate and butyl acetate (the mass ratio is 1: 1).
The preparation method of the thermosetting polyurethane modified asphalt, with reference to the preparation process flow shown in example 1 and fig. 1, tests the road performance of the asphalt and asphalt mixture after standard cultivation by referring to test specification for road engineering asphalt and asphalt mixture (JTG E20-2011), and mainly comprises the following steps: the holding time (the time when the viscosity of the system reaches 5000 mPas at 100 ℃), the low-temperature performance (-24 ℃ creep stiffness modulus, creep rate), and the high-temperature performance (64 ℃ elastic recovery rate, unrecoverable creep compliance). The tensile strength of the waterproof coating is tested by referring to the test method of the waterproof coating for buildings (GB/T16777-.
Example 10
The two-component thermosetting polyurethane modified asphalt provided by the invention in example 1 contains the following substances and the following materials in parts by mass as shown in the following table 10:
watch 10
| Raw material | Base asphalt | Isocyanates | Chain-extending cross-linking agent | Polyether polyols | Solvent(s) |
| Mass portion of | 100 | 25 | 4.5 | 110 | 15 |
The base asphalt is 90# asphalt, the isocyanate is hexamethylene diisocyanate trimer, the chain-extending cross-linking agent is 1, 4-butanediol, the polyether polyol is a mixture (mass ratio is 1:1:1) of polyoxyethylene glycol with molecular weight of 3000, polyoxypropylene glycol with molecular weight of 3000 and polytetrahydrofuran glycol with molecular weight of 3000, and the solvent is butyl acetate.
The preparation method of the thermosetting polyurethane modified asphalt, with reference to the preparation process flow shown in example 1 and fig. 1, tests the road performance of the asphalt and asphalt mixture after standard cultivation by referring to test specification for road engineering asphalt and asphalt mixture (JTG E20-2011), and mainly comprises the following steps: the holding time (the time when the viscosity of the system reaches 5000 mPas at 100 ℃), the low-temperature performance (-24 ℃ creep stiffness modulus, creep rate), and the high-temperature performance (64 ℃ elastic recovery rate, unrecoverable creep compliance). The tensile strength of the waterproof coating is tested by referring to the test method of the waterproof coating for buildings (GB/T16777-.
The performance tests of the thermosetting polyurethane modified asphalt prepared in the above 10 examples are shown in the following table 11:
TABLE 11
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. The two-component thermosetting polyurethane modified asphalt with adjustable retention time is characterized by comprising two raw materials, namely a component A and a component B, wherein the component A comprises the following raw material components in parts by weight: 100 parts of matrix asphalt, 0.3-5 parts of chain extension cross-linking agent, 20-110 parts of polyether polyol and 0-15 parts of diluent;
the component B comprises 5-25 parts of isocyanate.
2. The two-component thermosetting polyurethane modified asphalt with controllable retention time according to claim 1, wherein the isocyanate is selected from hexamethylene diisocyanate and at least one of biuret and trimer derivatives thereof.
3. The two-component thermosetting polyurethane modified asphalt with controllable holding time according to claim 1, characterized in that the chain extension crosslinking agent is one or two or more of 1, 4-butanediol, ethylene glycol, glycerol and 1, 6-hexanediol.
4. The two-component thermosetting polyurethane modified asphalt with adjustable retention time according to claim 1, characterized in that the polyether polyol is one or a combination of several of polyoxyethylene glycol, polyoxypropylene glycol and polytetrahydrofuran glycol with a molecular weight of 1000-4000.
5. The two-component thermosetting polyurethane modified asphalt with adjustable retention time according to claim 1, characterized in that the diluent is one or a mixture of ethyl acetate, butyl acetate and dimethylformamide.
6. The two-component thermosetting polyurethane modified asphalt with controllable holding time according to claim 1, wherein the base asphalt is 70# or 90# petroleum asphalt.
7. The method for preparing the two-component thermosetting polyurethane modified asphalt with controllable holding time according to any one of claims 1 to 6, which comprises the following steps:
(1) weighing the matrix asphalt, the chain extension cross-linking agent, the polyether polyol and the diluent according to the proportion, shearing and mixing to obtain a mixture serving as a component A, and weighing the isocyanate serving as a component B;
(2) respectively preheating the component A and the component B, then adding the component B into the component A, uniformly stirring to obtain a polyurethane mixture, and continuing to carry out curing treatment to obtain a target product.
8. The preparation method of the two-component thermosetting polyurethane modified asphalt with adjustable retention time according to claim 7, characterized in that in the step (1), the shearing and mixing time is 100-120 ℃, the stirring speed is 1000-3000 rpm, and the time is 5-10 min.
9. The method for preparing the two-component thermosetting polyurethane modified asphalt with adjustable retention time according to claim 7, wherein in the step (2), the component A is preheated to 100-120 ℃, and the component B is preheated to 60 ℃.
10. The preparation method of the two-component thermosetting polyurethane modified asphalt with adjustable retention time according to claim 7, wherein in the step (3), the process conditions of the curing treatment are as follows: curing at room temperature for 30d or at 100 ℃ for 7 h.
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