CN115819706A - Polyurethane composition for road repair, polyurethane resin, road repair material and construction method - Google Patents
Polyurethane composition for road repair, polyurethane resin, road repair material and construction method Download PDFInfo
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Abstract
The invention relates to a polyurethane composition, polyurethane resin, road patching material and construction method for road patching, wherein the polyurethane composition comprises a component A and a component B, and the component A comprises a polyurethane prepolymer; the polyurethane prepolymer is prepared from the following components in parts by weight: 100 parts of first polyol and 100-800 parts of polyisocyanate; the component B comprises: 100 parts of second polyol, 80-280 parts of water glass, 0.05-0.25 part of catalyst, 1-5 parts of coupling agent, 0.5-2.5 parts of defoaming agent and 0.5-5 parts of surfactant; in the polyurethane composition, the mass ratio of the component A to the component B is 1: (0.5-2.5). When the polyurethane resin mixed with the polyurethane composition for road repair is used for road repair, the curing speed is high, the hardness is high, the bonding strength is high, the service life is longer, the durability is higher, and the road surface is not easy to wear after repair.
Description
Technical Field
The invention relates to the technical field of pavement repair, in particular to a polyurethane composition, polyurethane resin, a road repair material and a construction method for road repair.
Background
In recent years, the road engineering scale of China is continuously enlarged, the road mileage is continuously increased, and the road market demand is mainly changed from new construction to maintenance. Ensuring high flatness of the road surface is an important content in road maintenance work and is an important index for measuring the road surface quality of high-grade highways in China. In the road actual motion in-process, because reasons such as differential settlement, the difference in height easily appears around bridge both ends seam or road surface well lid, when the vehicle went the too high difference position, can produce great vibrations and noise, brought noise pollution for the life of peripheral resident, also can influence driving travelling comfort and security, shortened the life of road and bridge. Therefore, once the road surface has a height difference, the high-grade road needs to be repaired effectively in time.
Patent cn201910992213.x discloses a pavement height difference repairing agent comprising an emulsified asphalt mixture, which is constructed at normal temperature, does not need special equipment, can be mixed by manual stirring or a simple stirrer, is simple and convenient to construct, can be constructed in a large scale, and can open traffic 30-60min after construction. The existing road surface altitude difference repairing material on the market mostly takes asphalt materials as main materials, or has the defects of low initial stability and long development and traffic time, or is not high in bonding strength with a base layer and easy to damage under heavy load conditions, or is greatly influenced by temperature, cracks at low temperature and softens at high temperature, and the altitude difference repairing requirements can not be well met mostly.
In conclusion, the road surface of the existing road surface elevation difference repairing material mainly using asphalt is greatly influenced by temperature after being repaired, and the road surface becomes soft at high temperature, brittle at low temperature and short in service life. How to obtain a reactive road surface altitude difference repairing material which has the advantages of high curing speed, high repairing strength, long service life and simple and convenient material construction is a technical problem to be solved urgently at present.
Disclosure of Invention
The invention aims to provide a polyurethane composition, a polyurethane resin, a road repairing material and a construction method for road repairing.
In a first aspect, the present invention relates to a polyurethane composition for road repair comprising an a-component and a B-component, wherein the a-component comprises: a polyurethane prepolymer; the polyurethane prepolymer is prepared from the following components in parts by weight: 100 parts of first polyol and 100-800 parts of polyisocyanate; the component B comprises the following components in parts by weight: 100 parts of second polyol, 80-280 parts of water glass, 0.05-0.25 part of catalyst, 1-5 parts of coupling agent, 0.5-2.5 parts of defoaming agent and 0.5-5 parts of surfactant; wherein in the polyurethane composition, the mass ratio of the component A to the component B is 1: (0.5-2.5).
Optionally, the polyisocyanate is selected from at least one of modified or unmodified toluene diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, isophorone diisocyanate, and hexamethylene diisocyanate; the content of isocyanate groups of the polyurethane prepolymer is 8 to 30 percent based on the total weight of the polyurethane prepolymer.
Optionally, the first polyol and the second polyol are each independently selected from at least one of a polyether polyol, a polyester polyol, and a vegetable oil based polyol.
Optionally, the first polyol and the second polyol are each independently selected from vegetable oil based polyols having a hydroxyl value of 50 to 400mgKOH/g and a functionality of 2 to 4; the vegetable oil-based polyol is at least one selected from the group consisting of polyols of soybean oil, safflower oil, linseed oil, corn oil, castor oil, sunflower oil, olive oil, rapeseed oil, sesame oil, cottonseed oil, palm oil and tung oil.
Optionally, the first polyol and the second polyol are each independently selected from polyether polyols having a hydroxyl number of 28 to 120mgKOH/g and a functionality of 2 to 3; the polyether polyol is at least one selected from propylene oxide polyether polyol, butylene oxide polyether polyol and polytetrahydrofuran polyether polyol.
Optionally, the first polyol and the second polyol are each independently selected from polyester polyols having a hydroxyl value of 56 to 130mgKOH/g and a functionality of 2 to 3; the polyester polyol is selected from at least one of polycaprolactone polyol, polycarbonate polyol and bio-based polyester polyol.
Optionally, the catalyst is selected from at least one of organometallic catalysts and morpholine-based catalysts.
Optionally, the coupling agent is a silane coupling agent, preferably at least one selected from the group consisting of 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-aminopropylmethyldimethoxysilane, 3-aminopropylmethyldiethoxysilane, 3- (2-aminoethyl) aminopropylmethyldimethoxysilane, N- (2-aminoethyl) -3-aminopropyltrimethoxysilane, N- (2-aminoethyl) -3-aminopropyltriethoxysilane, 3-diethylenetriaminepropylmethyldimethoxysilane and 3- (2,3 glycidoxy) propyltrimethoxysilane.
Optionally, the defoamer is a silicone defoamer, preferably at least one selected from the group consisting of Defom 6500, defom 5500, DAPRO AP1622, BYK-070, BYK-088, BYK-141, BYK-066N, BYK-065, TSA-750SH, and Airex 932; the surfactant is a non-ionic surfactant, preferably at least one selected from Glucopon 215UP, glucopon 225DK, glucopon 425N/NH, glucopon 600CSUP and Glucopon 650 EC.
In a second aspect, the present invention relates to a polyurethane resin for road repair, which is prepared from the polyurethane composition according to the first aspect of the present invention; the method of preparing the polyurethane resin from the polyurethane composition includes: (1) providing or preparing a component A; optionally comprising the step of preparing a polyurethane prepolymer: heating the first polyol to 110-115 ℃ under-0.094-0.1 MPa to dehydrate for 0.5-2 h, then cooling to 45-55 ℃, adding a first part of polyisocyanate, heating to 80-85 ℃, reacting for 2-4 h, cooling, adding or not adding a second part of polyisocyanate, and discharging to obtain the polyurethane prepolymer; (2) providing a component B; and (3) mixing the component A and the component B.
In a third aspect, the present invention relates to a road repair material comprising the polyurethane composition for road repair according to the first aspect of the present invention or the polyurethane resin for road repair according to the second aspect of the present invention.
In a fourth aspect, the present invention relates to a construction method for road elevation difference repair, comprising the steps of: (1) Cleaning the height difference part, and filling and paving the cleaned height difference part flatly by using aggregate; the grain size of the aggregate is 0.075-4.75 mm; (2) Pouring the polyurethane resin for road repair according to the second aspect of the present invention on the surface of the aggregate paved at the elevation difference portion, and mixing the polyurethane resin with the aggregate to form a mixture; wherein the mass ratio of the polyurethane resin in the mixture is 6-18%, preferably 8-15%; (3) And leveling the mixture at the height difference part, and spreading fine sand on the surface of the mixture before the polyurethane resin is completely cured.
Has the advantages that:
when the polyurethane resin mixed with the polyurethane composition for road repair is used for road repair, the curing speed is high, the hardness is high, the bonding strength is high, the service life is longer, the durability is higher, and the road surface is not easy to wear after repair.
Detailed Description
The present application will be described in further detail below with reference to examples. The features and advantages of the present application will become more apparent from the description.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
In addition, the technical features described below in the different embodiments of the present application may be combined with each other as long as they do not conflict with each other.
In the present invention, the parts may be expressed as parts by weight, and the NCO content is expressed as the content of the isocyanate group.
In a first aspect, the present invention relates to a polyurethane composition for road repair comprising an a-component and a B-component, wherein the a-component comprises: a polyurethane prepolymer; the polyurethane prepolymer is prepared from the following components in parts by weight: 100 parts of first polyol and 100-800 parts of polyisocyanate; the component B comprises the following components in parts by weight: 100 parts of second polyol, 80-280 parts of water glass, 0.05-0.25 part of catalyst, 1-5 parts of coupling agent, 0.5-2.5 parts of defoaming agent and 0.5-5 parts of surfactant; wherein in the polyurethane composition, the mass ratio of the component A to the component B is 1: (0.5-2.5).
The polyurethane composition according to the first aspect of the present invention is a reactive road surface patching material. After the component A and the component B are mixed, the isocyanate component in the component A and the active hydrogen component in the component B rapidly undergo a gradual addition polymerization reaction under the action of a catalyst and other auxiliaries to generate a linear and/or three-dimensional molecular structure, and finally a polyurethane resin cured product is obtained. Before the polyurethane resin is cured, the polyurethane resin can be bonded and/or reacted with aggregate particles simultaneously used in pavement repair in a mode of chemical bonds, hydrogen bonds, van der Waals force, electrostatic force, physical embedding and the like, and simultaneously, the aggregate particles are firmly bonded and/or reacted with the surface of a pavement to be repaired, and further, the polyurethane resin is cured to obtain the repairing effect of firm bonding.
The polyurethane composition of the present invention uses both the polyol and the water glass in combination with the surfactant, so that the material curing speed in the road surface repairing process is high, the repairing strength is high, and the service life and the durability are longer.
According to a particular embodiment of the polyurethane composition according to the first aspect of the present invention, the polyisocyanate is selected from at least one of modified or unmodified toluene diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, isophorone diisocyanate and hexamethylene diisocyanate; the content of isocyanate groups of the polyurethane prepolymer is 8 to 30 percent based on the total weight of the polyurethane prepolymer. Preferably, the isocyanate group content of the polyurethane prepolymer is greater than 12%.
The polyurethane prepolymer obtained by reacting the polyisocyanate with the first polyol and the component B together form the polyurethane composition for road repair, and the polyurethane composition can exert a synergistic effect to better repair roads. When the polyisocyanate is selected from modified diphenylmethane diisocyanates, it may be specifically a polymethylene polyphenyl polyisocyanate.
According to a particular embodiment of the polyurethane composition according to the first aspect of the present invention, the first polyol and the second polyol are each independently selected from at least one of polyether polyols, polyester polyols and vegetable oil based polyols.
According to a particular embodiment of the polyurethane composition according to the first aspect of the present invention, the first polyol and the second polyol are each independently selected from vegetable oil based polyols having a hydroxyl value of 50 to 400mgKOH/g and a functionality of 2 to 4; the vegetable oil-based polyol is at least one selected from the group consisting of polyols of soybean oil, safflower oil, linseed oil, corn oil, castor oil, sunflower oil, olive oil, rapeseed oil, sesame oil, cottonseed oil, palm oil and tung oil.
In the polyurethane composition for road repair of the present invention, the vegetable oil-based polyol is selected as the second polyol, and water glass is compounded according to a certain weight relationship, so that the curing speed, hardness, adhesive strength, etc. can be significantly improved during road repair, and the repaired road surface has better durability and longer service life. The modulus of the water glass used in the polyurethane composition for road repair of the present invention may be 2.0 to 3.5.
According to another particular embodiment of the polyurethane composition according to the first aspect of the present invention, the first polyol and the second polyol are each independently selected from polyether polyols having a hydroxyl value of 28 to 120mgKOH/g and a functionality of 2 to 3; the polyether polyol is at least one selected from propylene oxide polyether polyol, butylene oxide polyether polyol and polytetrahydrofuran polyether polyol.
When the first polyol and the second polyol are each independently selected from polyether polyols, the first polyol and/or the second polyol may preferably be a polypropylene glycol, i.e., a propylene oxide polyether polyol.
According to yet another embodiment of the polyurethane composition of the first aspect of the present invention, the first polyol and the second polyol are each independently selected from polyester polyols having a hydroxyl value of 56 to 130mgKOH/g and a functionality of 2 to 3; the polyester polyol is selected from at least one of polycaprolactone polyol, polycarbonate polyol and bio-based polyester polyol.
According to a particular embodiment of the polyurethane composition according to the first aspect of the present invention, the catalyst is at least one selected from the group consisting of organometallic catalysts and morpholine-based catalysts.
It should be noted that the catalyst of the present invention is used to accelerate the reaction between the isocyanate component in the component a and the active hydrogen component in the component B, and the organometallic catalyst of the present invention may be an organobismuth catalyst or an organotin catalyst, etc.
According to a particular embodiment of the polyurethane composition according to the first aspect of the invention, the coupling agent is a silane coupling agent, preferably at least one selected from the group consisting of 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-aminopropylmethyldimethoxysilane, 3-aminopropylmethyldiethoxysilane, 3- (2-aminoethyl) aminopropylmethyldimethoxysilane, N- (2-aminoethyl) -3-aminopropyltrimethoxysilane, N- (2-aminoethyl) -3-aminopropyltriethoxysilane, 3-diethylenetriaminopropylmethyldimethoxysilane and 3- (2,3 glycidoxy) propyltrimethoxysilane.
When the polyurethane composition for road repair is used for road repair, inorganic groups in the silane coupling agent can react with oxides on the surface of a sunken road surface or a crack to generate stable silicon-oxygen bonds, and organic groups in the silane coupling agent can react with isocyanate groups to be grafted on a polyurethane molecular chain, so that the bonding strength between a repair material and the road surface is increased.
According to a particular embodiment of the polyurethane composition according to the first aspect of the present invention, the defoamer is a silicone defoamer, preferably at least one selected from the group consisting of Defom 6500, defom 5500, DAPRO AP1622, BYK-070, BYK-088, BYK-141, BYK-066N, BYK-065, TSA-750SH, and Airex 932; the surfactant is a nonionic surfactant, preferably at least one selected from Glucopon 215UP, glucopon 225DK, glucopon 425N/NH, glucopon 600CSUP and Glucopon 650 EC.
It should be noted that in the polyurethane composition for road repair of the present invention, bubbles which do not have any effect and are not beneficial to road repair are generated in the process of mixing the component a and the component B to obtain the polyurethane resin, and the addition of the silicone defoamer, especially the one or more silicone defoamers, can well eliminate the generated bubbles, and is beneficial to obtaining greater strength on the repaired road surface, so that the repaired road surface has better durability and service life.
It should be noted that, as a preferred embodiment, in the polyurethane composition for road repair of the present invention, the second polyol is selected from the vegetable oil-based polyols, and the water glass is compounded according to the weight parts, and the nonionic surfactant is compounded at the same time, so that the obtained polyurethane composition is more stable in storage, after the a component and the B component are mixed in the process of road repair, in the presence of the nonionic surfactant, the surface tension of different components such as the polyurethane prepolymer in the a component, the second polyol in the B component, and the water glass is reduced, the components can be uniformly mixed more quickly, the rapid reaction of the isocyanate component and the active hydrogen component is promoted, the polyurethane resin is cured more quickly, and the bonding strength and the service life of the cured polyurethane resin are improved.
In a second aspect, the present invention relates to a polyurethane resin for road repair, which is prepared from the polyurethane composition according to the first aspect of the present invention; the method of preparing the polyurethane resin from the polyurethane composition includes: (1) providing or preparing a component A; optionally comprising the step of preparing a polyurethane prepolymer: heating the first polyol to 110-115 ℃ under-0.094-0.1 MPa to dehydrate for 0.5-2 h, then cooling to 45-55 ℃, adding a first part of polyisocyanate, heating to 80-85 ℃, reacting for 2-4 h, cooling, adding or not adding a second part of polyisocyanate, and discharging to obtain the polyurethane prepolymer; (2) providing a component B; and (3) mixing the component A and the component B.
In the first embodiment, in the step (1), the temperature is raised to 80 to 85 ℃ to react for 2 to 4 hours, and then the temperature is lowered to discharge the polyurethane prepolymer. In this embodiment, the polyisocyanate is added all at once.
As a second embodiment, in the step (1), the temperature is increased to 80-85 ℃, after the reaction is carried out for 2-4 h, the temperature is reduced to 45-55 ℃, a second part of polyisocyanate is added and uniformly mixed, and the polyurethane prepolymer is obtained after discharging. In this embodiment, the polyisocyanate is added in two portions, the first portion of polyisocyanate is added after the first polyol is dehydrated and cooled, then the temperature is raised for reaction for a certain period of time, and the second portion of polyisocyanate is added after the temperature is reduced to 45-55 ℃. In the embodiment, the second part of polyisocyanate is not subjected to temperature rise reaction, and the part of the additionally added polyisocyanate can avoid adverse phenomena such as self-polymerization of the polyisocyanate at high temperature, so that the NCO content of the obtained polyurethane prepolymer can be adjusted to be within a target content range, and the performance of a final product can be regulated and controlled to a certain extent.
In the second embodiment, the sum of the weights of the first partial polyisocyanate and the second partial polyisocyanate is the total weight, the ratio of the first partial polyisocyanate in the total weight may be 20 to 50%, the ratio of the second partial polyisocyanate in the total weight may be 50 to 80%, and specifically, the weight ratio of the first partial polyisocyanate to the second partial polyisocyanate may be 1:3. the first and second partial polyisocyanates may be the same polyisocyanate or selected from different polyisocyanates.
In a third aspect, the present invention relates to a road repair material comprising the polyurethane composition for road repair according to the first aspect of the present invention or the polyurethane resin for road repair according to the second aspect of the present invention.
In a fourth aspect, the present invention relates to a construction method for road elevation difference repair, comprising the steps of: (1) Cleaning the height difference part, and filling and leveling the cleaned height difference part by using aggregate; the grain size of the aggregate is 0.075-4.75 mm; (2) Pouring the polyurethane resin for road repair according to the second aspect of the present invention on the surface of the aggregate paved at the elevation difference portion, and mixing the polyurethane resin with the aggregate to form a mixture; wherein the mass ratio of the polyurethane resin in the mixture is 6-18%, preferably 8-15%; (3) And leveling the mixture at the height difference part, and spreading fine sand on the surface of the mixture before the polyurethane resin is completely cured.
The construction method for road elevation repair of the present invention is simple and easy to perform. In the step (1), the aggregate can be broken stone and the like, and a proper amount of aggregate is selected for filling and paving according to the height difference size of 2-5 cm; in the step (2), the component A and the component B in the first aspect of the invention can also be mixed to obtain polyurethane resin, and then casting is carried out; in the step (2), uniformly mixing the polyurethane resin and the aggregate to form a mixture; in the step (3), a plastering trowel can be used for smoothing the surface, fine sand is spread before the resin is completely cured, and the traffic can be developed after waiting for 10-15 min.
According to the road repairing material or the construction method for road height difference repairing, a repairing surface with good strength can be formed within 10min at room temperature, and traffic can be opened within 30 min; the adhesive does not need to use a base coat, and can form high adhesive strength with various base materials such as asphalt concrete, steel plates and the like; the road patching material does not soften at high temperature and does not crack at low temperature.
The present invention will be described in further detail with reference to examples, but the present invention is not limited thereto.
The reagents used in the following examples are commercial finished reagents unless otherwise specified.
The manufacturers and brand descriptions of the reagents used in the following examples or comparative examples:
1. polyol (b):
castor oil polyol, product brand XP D1000, functionality 2, hydroxyl value 122mgKOH/g, van. Terruss;
polypropylene glycol, product designation PPG1000, functionality 2, hydroxyl value 112mgKOH/g, shandong Lanxing Dongdao Co., ltd;
vegetable oil-based polyol, product brand Sovermol 819, functionality 2.6, hydroxyl value 240mgKOH/g, basff;
2. polyisocyanate:
diphenylmethane diisocyanate, product designation MDI-50, vanhua chemical group Ltd;
polymethylene polyphenyl polyisocyanate (modified diphenylmethane diisocyanate), product brand PM200, wanhua chemical group corporation;
liquefied diphenylmethane diisocyanate (modified diphenylmethane diisocyanate) product designation MDI 100L, wanhua chemical group, ltd;
3. water glass, modulus 3.1, tianjin neutrality shengtai chemical limited;
4. catalyst: an organic metal catalyst for polyurethane resin, product brand AUCAT-100E, guangzhou Youyun synthetic materials Co., ltd;
5. coupling agent: 3- (2,3 glycidoxy) propyltrimethoxysilane, product designation A-187, ma et al;
6. defoaming agent: product designation BYK-065, bike chemical;
7. surfactant (b): product brand Glucopon 215UP, basff.
The amounts of the components of the following examples are all expressed in parts by weight.
Example 1
(1) Preparing a component A:
heating 100 parts of castor oil polyol (XP D1000) to 110 ℃, dehydrating for 1h in vacuum (-0.096 MPa), then cooling to 50 ℃, adding 100 parts of diphenylmethane diisocyanate (MDI-50), gradually heating to 80-85 ℃, reacting for 3h, cooling to 50 ℃, supplementing 300 parts of polymethylene polyphenyl polyisocyanate (PM 200), uniformly mixing and discharging to obtain the polyurethane prepolymer, wherein the content of isocyanate group (NCO) is 25.1%.
(2) Preparing a component B:
100 parts of castor oil polyol (XP D1000) and 100 parts of water glass (modulus 3.1) are uniformly mixed, then 0.18 part of organic metal catalyst (AUCAT-100E) for polyurethane resin, 1.5 parts of 3- (2,3 epoxypropoxy) propyl trimethoxy silane (A-187) serving as a coupling agent, 1.5 parts of defoaming agent (BYK-065) and 2.5 parts of nonionic surfactant (Glucon 215 UP) are added, and the mixture is uniformly stirred to obtain a component B.
(3) And (3) mixing the component A and the component B according to the mass ratio of 1:1, mixing to obtain the polyurethane resin for road repair.
Example 2
(1) Preparing a component A:
heating 100 parts of castor oil polyol (XP D1000) to 110 ℃, dehydrating for 1h under vacuum (-0.096 MPa), then cooling to 50 ℃, adding 150 parts of diphenylmethane diisocyanate (MDI-50), gradually heating to 80-85 ℃, reacting for 3h, cooling and discharging to obtain a polyurethane prepolymer, wherein the content of isocyanate group (NCO) is 16.8%.
(2) Preparing a component B:
100 parts of vegetable oil-based polyol (Sovermol 819) and 90 parts of water glass (modulus 3.1) are uniformly mixed, then 0.25 part of organic metal catalyst (AUCAT-100E) for polyurethane resin, 1.5 parts of 3- (2,3 epoxypropoxy) propyl trimethoxy silane (A-187) serving as a coupling agent, 2.0 parts of defoaming agent (BYK-065) and 2.5 parts of nonionic surfactant (Glucopon 215 UP) are added, and the mixture is uniformly stirred to obtain a component B.
(3) And (3) mixing the component A and the component B according to the mass ratio of 1:1, and mixing to obtain the polyurethane resin for road repair.
Example 3
(1) Preparing a component A:
same as in example 1.
(2) Preparing a component B:
100 parts of vegetable oil-based polyol (Sovermol 819) and 100 parts of water glass (modulus 3.1) are uniformly mixed, then 0.15 part of organic metal catalyst (AUCAT-100E) for polyurethane resin, 1.5 parts of 3- (2,3 epoxypropoxy) propyl trimethoxy silane (A-187) serving as a coupling agent, 1.5 parts of defoaming agent (BYK-065) and 2.5 parts of nonionic surfactant (Glucopon 215 UP) are added, and the mixture is uniformly stirred to obtain a component B.
(3) Same as in example 1.
Example 4
A polyurethane resin for road repair was prepared in the same manner as in example 1, except that:
the castor oil polyol (XP D1000) in the a component of example 1 was replaced with an equal weight of polypropylene glycol (PPG 1000), and the castor oil polyol (XP D1000) in the B component was replaced with an equal weight of vegetable oil based polyol (Sovermol 819).
Example 5
(1) Preparing a component A:
100 parts of polypropylene glycol (PPG 1000) is heated to 110 ℃ and dehydrated for 1 hour in vacuum (-0.096 MPa), then the temperature is reduced to 50 ℃, 250 parts of liquefied diphenylmethane diisocyanate (MDI 100L) is added, the temperature is gradually increased to 80-85 ℃, after reaction is carried out for 3 hours, the temperature is reduced to 50 ℃, 500 parts of polymethylene polyphenyl polyisocyanate (PM 200) is replenished, the materials are uniformly mixed and discharged, and the polyurethane prepolymer is obtained, wherein the content of isocyanate group (NCO) is 27.4%.
(2) Preparing a component B:
100 parts of vegetable oil-based polyol (Sovermol 819) and 200 parts of water glass (modulus 3.1) are uniformly mixed, then 0.15 part of organic metal catalyst (AUCAT-100E) for polyurethane resin, 3.5 parts of 3- (2,3 epoxypropoxy) propyl trimethoxy silane (A-187) serving as a coupling agent, 2.0 parts of defoaming agent (BYK-065) and 3.5 parts of nonionic surfactant (Glucopon 215 UP) are added, and the mixture is uniformly stirred to obtain a component B.
(3) And (3) mixing the component A and the component B according to the mass ratio of 1:2, mixing to obtain the polyurethane resin for road repair.
Comparative example 1
A polyurethane resin for road repair was prepared in the same manner as in example 1, except that:
castor oil polyol XP D1000 was not added in the preparation of component B.
Comparative example 2
A polyurethane resin for road repair was prepared according to the method of example 2, except that:
no water glass was added in the preparation of component B.
Comparative example 3
A polyurethane resin for road repair was prepared according to the method of example 2, except that:
the amount of the water glass added in the preparation of the component B is 50 parts.
Test example 1
The polyurethane resins for road repair prepared in the above examples and comparative examples were tested for curing time, hardness, adhesive strength, tensile strength and elongation at break, and the results are shown in table 1.
The performance test method is as follows:
1. curing time
The curing time is tested according to the specification of 16 in GB/T16777;
2. adhesive strength
The bonding strength is tested according to the specification of 7 in GB/T16777, and the resin is smeared on the surface of an asphalt concrete sample block with the thickness of 0.2-0.5mm;
3. tensile strength and elongation at break
The tensile strength and the elongation at break are tested according to the regulation of GB/T528-2009;
4. hardness of
The hardness is tested according to the specification of GB/T6031-2017.
TABLE 1 polyurethane resin Performance test results
It can be seen from the data in Table 1 that the polyurethane resins of the examples are excellent in the overall properties in terms of curing time, hardness, adhesive strength, tensile strength, etc., and the polyurethane resins of the comparative examples are either too long in curing time, too low in elongation at break to easily break, or low in adhesive strength, and inferior in overall properties to those of the examples. In the component B of the comparative example 3, the amount of the water glass is too small, and after the A, B component is mixed, the material is foamed seriously, and the obtained polyurethane resin is low in bonding strength and easy to break.
Test example 2
The polyurethane resin for road repair prepared in the above examples and comparative examples is used for repairing the road with the height difference, the expansion joints (areas with different positions but similar recess depth and shape) of the bridge head of the asphalt pavement are respectively filled with the materials prepared in the above examples and comparative examples, the adding amount of the polyurethane resin is 10% (the proportion of the polyurethane resin in the total mass of the polyurethane resin and the aggregate), and the aggregate is basalt macadam with the particle size of 0.075-4.75 mm. Specifically, the expansion joints of the bridge head are cleaned, the expansion joints are filled and paved flatly by using the basalt broken stones, the polyurethane resins prepared in the above examples and comparative examples are uniformly poured on the surfaces of the basalt broken stones filled in different positions, the polyurethane resins and the broken stones are uniformly mixed and leveled, and fine sand is spread on the surfaces before the polyurethane resins are completely cured. And evaluating the development traffic time, testing the structural depth, the friction coefficient and the water seepage coefficient of the pavement, observing the condition after 30 days of operation, and obtaining results shown in table 2.
The test method involved is as follows:
the open traffic time is the time required to start the timing with the A, B mixed component until the polyurethane resin is completely dry.
The construction depth was tested by reference to T0961-1995 in the test procedures on site of road pavements (JTG 3450-2019).
The coefficient of friction was tested according to T0964-2008 of the test code for road subgrade and pavement on site (JTG 3450-2019).
The water permeability coefficient is tested according to T0971-2019 in the road subgrade and pavement site test regulation (JTG 3450-2019).
TABLE 2 condition of the polyurethane resin after repairing the height difference of the asphalt pavement
The data in table 2 show that the polyurethane resin prepared by the embodiment has excellent comprehensive performance on repairing the asphalt pavement, and the repaired pavement has less wear and longer service life in the same time. The polyurethane resin can well keep stable at the temperature of-30-70 ℃, so compared with asphalt repair materials, the road repair material has better high and low temperature stability. In addition, the road patching material can be mixed by equipment or manually, is convenient to operate, has high bonding strength with a base material, and has toughness.
In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on operational states of the present application, and are only used for convenience in describing and simplifying the present application, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
In the description of the present application, it is to be noted that the terms "mounted," "connected," and "connected" are to be construed broadly unless otherwise explicitly stated or limited. The specific meaning of the above terms in this application will be understood to be a specific case for those of ordinary skill in the art.
The present application has been described above with reference to preferred embodiments, but these embodiments are merely exemplary and merely illustrative. On the basis of the above, the present application can be subjected to various substitutions and improvements, and the substitutions and the improvements are all within the protection scope of the present application.
Claims (12)
1. A polyurethane composition for road repair, characterized in that the polyurethane composition comprises an A-component and a B-component, wherein,
the component A comprises:
a polyurethane prepolymer;
the polyurethane prepolymer is prepared from the following components in parts by weight:
100 parts of a first polyol, and
100-800 parts of polyisocyanate;
the component B comprises the following components in parts by weight:
100 parts of a second polyol, wherein the second polyol is a polyol,
80-280 parts of water glass,
0.05 to 0.25 portion of catalyst,
1-5 parts of a coupling agent,
0.5 to 2.5 parts of defoaming agent, and
0.5-5 parts of a surfactant;
wherein in the polyurethane composition, the mass ratio of the component A to the component B is 1: (0.5-2.5).
2. The polyurethane composition of claim 1, wherein the polyisocyanate is selected from at least one of modified or unmodified toluene diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, isophorone diisocyanate, and hexamethylene diisocyanate;
the content of isocyanate groups of the polyurethane prepolymer is 8 to 30 percent based on the total weight of the polyurethane prepolymer.
3. The polyurethane composition of claim 1, wherein the first polyol and the second polyol are each independently selected from at least one of a polyether polyol, a polyester polyol, and a vegetable oil based polyol.
4. The polyurethane composition of claim 3, wherein the first polyol and the second polyol are each independently selected from vegetable oil based polyols having a hydroxyl value of 50 to 400mgKOH/g and a functionality of 2 to 4;
the vegetable oil-based polyol is at least one selected from the group consisting of polyols of soybean oil, safflower oil, linseed oil, corn oil, castor oil, sunflower oil, olive oil, rapeseed oil, sesame oil, cottonseed oil, palm oil and tung oil.
5. A polyurethane composition according to claim 3, wherein the first polyol and the second polyol are each independently selected from polyether polyols having a hydroxyl value of 28 to 120mgKOH/g and a functionality of 2 to 3;
the polyether polyol is at least one selected from propylene oxide polyether polyol, butylene oxide polyether polyol and polytetrahydrofuran polyether polyol.
6. The polyurethane composition of claim 3, wherein the first polyol and the second polyol are each independently selected from polyester polyols having a hydroxyl value of 56 to 130mgKOH/g and a functionality of 2 to 3;
the polyester polyol is selected from at least one of polycaprolactone polyol, polycarbonate polyol and bio-based polyester polyol.
7. The polyurethane composition of claim 1, wherein the catalyst is selected from at least one of an organometallic catalyst and a morpholine-based catalyst.
8. The polyurethane composition according to claim 1, wherein the coupling agent is a silane coupling agent, preferably at least one selected from the group consisting of 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-aminopropylmethyldimethoxysilane, 3-aminopropylmethyldiethoxysilane, 3- (2-aminoethyl) aminopropylmethyldimethoxysilane, N- (2-aminoethyl) -3-aminopropyltrimethoxysilane, N- (2-aminoethyl) -3-aminopropyltriethoxysilane, 3-diethylenetriaminopropylmethyldimethoxysilane and 3- (2,3 glycidoxy) propyltrimethoxysilane.
9. The polyurethane composition of claim 1, wherein the defoamer is a silicone defoamer, preferably at least one selected from the group consisting of Defom 6500, defom 5500, DAPRO AP1622, BYK-070, BYK-088, BYK-141, BYK-066N, BYK-065, TSA-750SH, and Airex 932;
the surfactant is a nonionic surfactant, preferably at least one selected from Glucopon 215UP, glucopon 225DK, glucopon 425N/NH, glucopon 600CSUP and Glucopon 650 EC.
10. A polyurethane resin for road repair, which is prepared from the polyurethane composition according to any one of claims 1 to 9; the method of preparing the polyurethane resin from the polyurethane composition includes:
(1) Providing or preparing a component A; optionally comprising the step of preparing a polyurethane prepolymer:
heating the first polyol to 110-115 ℃ under-0.094-0.1 MPa to dehydrate for 0.5-2 h, then cooling to 45-55 ℃, adding a first part of polyisocyanate, heating to 80-85 ℃, reacting for 2-4 h, cooling, adding or not adding a second part of polyisocyanate,
discharging to obtain the polyurethane prepolymer;
(2) Providing a component B;
(3) Mixing the component A and the component B.
11. A road repair material comprising the polyurethane composition for road repair of any one of claims 1 to 9 or the polyurethane resin for road repair of claim 10.
12. A construction method for road height difference repair is characterized by comprising the following steps:
(1) Cleaning the height difference part, and filling and paving the cleaned height difference part flatly by using aggregate; the grain size of the aggregate is 0.075-4.75 mm;
(2) Pouring the polyurethane resin for road restoration of claim 10 on the surface of the aggregate paved at the elevation part, and mixing the polyurethane resin with the aggregate to form a mixture; wherein the mass ratio of the polyurethane resin in the mixture is 6-18%, preferably 8-15%;
(3) And leveling the mixture at the height difference part, and spreading fine sand on the surface of the mixture before the polyurethane resin is completely cured.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116041659A (en) * | 2023-03-27 | 2023-05-02 | 旭川化学（苏州）有限公司 | Solvent-free bio-based polyurethane resin and preparation method and application thereof |
| CN116285651A (en) * | 2023-03-27 | 2023-06-23 | 山东三新新材料科技有限公司 | Wear-resistant rubber repairing agent and preparation method and application thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116041659A (en) * | 2023-03-27 | 2023-05-02 | 旭川化学（苏州）有限公司 | Solvent-free bio-based polyurethane resin and preparation method and application thereof |
| CN116041659B (en) * | 2023-03-27 | 2023-06-09 | 旭川化学（苏州）有限公司 | Solvent-free bio-based polyurethane resin and preparation method and application thereof |
| CN116285651A (en) * | 2023-03-27 | 2023-06-23 | 山东三新新材料科技有限公司 | Wear-resistant rubber repairing agent and preparation method and application thereof |
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