CN117945701A - Large-gap quick-curing polyurethane wearing layer material and preparation method and application thereof - Google Patents

Abstract

The invention relates to the technical field of road engineering, and provides a large-gap quick-curing polyurethane wearing layer material, a preparation method and application thereof, wherein the glue Dan Bi of the mixture is 4.7-5.3%. The raw materials comprise: a single-component polyurethane adhesive containing diamine curing agent, rubber powder with more than 40 meshes and mineral aggregate; the mass percentage of the diamine curing agent in the single-component polyurethane adhesive is 1.5-2%; the amount of the rubber powder is 0.5-2% of the aggregate mass in the mineral aggregate. According to the invention, by designing the specific polyurethane wearing layer material, the road performance of the large-gap quick-curing polyurethane wearing layer is greatly improved, the fatigue life is remarkably improved, and particularly the low-temperature crack resistance is remarkably improved.

Description

Large-gap quick-curing polyurethane wearing layer material and preparation method and application thereof

Technical Field

The invention relates to the technical field of road engineering, and relates to a large-gap quick-curing polyurethane wearing layer material, and a preparation method and application thereof.

Background

The macroporous wearing layer not only can be used for preventive maintenance of the established high-grade highway, but also can be used for wearing layers on the surface of the newly-built highway. There is increasing interest in having excellent drainage, anti-slip, noise reduction, etc. However, because the asphalt mixture with the macropore wearing layer has large void ratio and small asphalt consumption, stones are connected in a point-to-point manner, and the problems of loosening, peeling and the like are easy to occur. There is a great need for a mix cement that has excellent properties.

The polyurethane adhesive is a high molecular polymer material with a molecular chain containing a carbamate structure, and is gradually used as cementing material for road pavement due to the advantages of excellent mechanical property, strong elastic recoverability, designable controllability of material property, strong weather resistance and cold resistance, environmental friendliness and the like. According to the polyurethane wearing layer material and the preparation method thereof, as provided in the patent application CN 116813243A, the high-temperature diseases of the pavement and the urban heat island effect are reduced by adding the nano filler with high refractive index into the polyurethane wearing layer material. However, there is very little research on the use of polyurethane adhesives for improving macropore wear layers, and a polyurethane rubber drainage pavement structure for concrete bridge decks is proposed in patent application CN 110438896A, which comprises a leveling layer, a modified emulsified asphalt bonding layer, an asphalt concrete layer, a polyurethane waterproof bonding layer and a polyurethane rubber porous mixture surface layer which are sequentially laid from bottom to top. The polyurethane rubber porous mixture surface layer comprises: 100 parts of aggregate, 4-15 parts of polyurethane bonding component and 3-15 parts of rubber particles. Although the method is widely used for improving the flexibility of the polyurethane rubber porous mixture surface layer by utilizing the characteristics of rubber particles and polyurethane to influence the low-temperature cracking resistance of the polyurethane rubber porous mixture surface layer, in practice, the method has limited improvement degree of the low-temperature cracking resistance, and more importantly, the paving thickness of the mixture surface layer is generally more than 4cm, and the mixture surface layer is used as a pavement structure layer. The wear layer cannot be used as a maintenance wear layer, the thickness of the wear layer is only 1-2 cm, and the wear layer is very thin and is directly contacted with wheels, so that the wear layer is subjected to the comprehensive effects of vehicle load, temperature, ultraviolet and moisture environments, and the requirement on the wear layer is obviously higher than that of a polyurethane mixture pavement surface layer. The mixture obtained by the method cannot meet the requirement of a wearing layer.

In view of this, the present invention has been proposed.

Disclosure of Invention

The invention provides a large-gap quick-curing polyurethane wearing layer material, a preparation method and application thereof, which are used for solving the defect that the polyurethane adhesive is not sufficiently applied in a large-pore wearing layer in the prior art.

Specifically, in a first aspect, the invention provides a polyurethane wearing layer material, wherein the glue Dan Bi is 4.7-5.3%, and the raw materials comprise: a single-component polyurethane adhesive containing diamine curing agent, rubber powder with more than 40 meshes and mineral aggregate; the mass percentage of the diamine curing agent in the single-component polyurethane adhesive is 1.5-2%; the amount of the rubber powder is 0.5-2% of the aggregate mass in the mineral aggregate.

According to the experience related to asphalt mixture wearing layers, the leakage loss is preferably controlled below 0.2%, the porosity is required to be controlled in the range of 18-23%, and on the basis, the low-temperature crack resistance, the high-temperature rut resistance, the water damage resistance and the good durability are considered, so that the method is very difficult to realize. According to the invention, the diamine curing agent is added into the wearing layer for the first time, the generation of carbon dioxide gas of the polyurethane adhesive is regulated by using the diamine curing agent, the structure of the wearing layer is optimized, and in experiments, the diamine curing agent is not added too much, the insufficient diamine curing agent can negatively affect the performance, and the diamine curing agent can also increase the void ratio of the wearing layer. Wherein, under the formula, the glue Dan Bi has a larger influence on the leakage loss and the void ratio of the formed wearing layer, and the proportion of the glue to the stone is controlled to be 4.7-5.3%.

In some embodiments provided herein, the rubber powder is 60-100 mesh tread rubber powder, having a moisture content of less than 1%, and a metal content of less than 0.5%.

The rubber powder is prepared by crushing high-quality tread rubber, and has high product purity and uniform rubber powder. Besides the above effects, the friction material is also used for improving the friction coefficient and reducing noise.

In some embodiments provided herein, the one-component polyurethane adhesive consists essentially of a polyurethane prepolymer and a diamine-based curing agent;

the amine equivalent of the diamine curing agent is 135-145, and the moisture is less than or equal to 0.10%;

The NCO content of the polyurethane prepolymer is 6-9%.

In some embodiments provided herein, the polyurethane prepolymer consists essentially of isocyanate and polyether polyol.

In some embodiments provided by the invention, the single-component polyurethane adhesive further comprises a catalyst with mass percent of less than 0.5%;

Preferably, the catalyst is an organotin-based catalyst, preferably dibutyltin dilaurate and/or stannous isooctanoate, more preferably dibutyltin dilaurate.

In some embodiments provided herein, the mineral aggregate comprises a mineral powder having a moisture content of no greater than 0.5%;

In some embodiments provided herein, the mineral aggregate is graded as PC-10; the mass ratio of the aggregate with the diameter of 5-10 mm to the aggregate with the diameter of 3-5 mm to the aggregate with the diameter of 0-3 mm to the mineral powder is 34-46:35-48:9-20:0-3, and preferably, the mass percentage of the mineral powder in the mineral aggregate is 0.3-1%; more preferably, the mass ratio of 5-10 mm aggregate, 3-5 mm aggregate, 0-3 mm aggregate and mineral powder is 43:42:14:1; more specifically, the gradation is as follows:

In a second aspect, the present invention also provides a method of making a polyurethane wear layer material as described above.

In some embodiments provided herein, the method of preparing comprises:

dry-mixing the coarse aggregate and the fine aggregate for 15-25 s to obtain a dry-mixed mixture;

adding the single-component polyurethane adhesive into the dry-mixed mixture, and stirring for 45-60 s to obtain a mixture;

and adding mineral powder and rubber powder into the mixture, and continuously mixing for 45-60 seconds to obtain the polyurethane wearing layer material.

In a third aspect, the invention further provides application of the polyurethane wearing layer material in bridge deck pavement, tunnel pavement, expressway special road sections (ramp, service area and the like), urban expressways, signal lamp intersections and other scenes, and the macropore wearing layer endows the pavement with a drainage function, so that the driving safety and the driving comfort of the pavement in rainy days are improved, and the durability of the pavement is greatly improved;

preferably, the polyurethane wearing layer has a thickness of 1.0 to 2.0cm.

According to the large-gap quick-curing polyurethane wearing layer material, the preparation method and the application thereof, through the design of specific polyurethane wearing layer materials, particularly the glue Dan Bi, raw materials and a formula thereof, the polyurethane wearing layer formed by the polyurethane wearing layer material has the functions of draining water (large gaps), resisting sliding, reducing noise and the like of drainage asphalt mixture, the road performance is greatly improved, the fatigue life is obviously prolonged, and the service life of the polyurethane wearing layer is prolonged, particularly, the diamine curing agent and the rubber powder play a synergistic effect on trabecular bending in the polyurethane adhesive, so that the low-temperature cracking resistance of the polyurethane wearing layer is obviously improved. In addition, the polyurethane wearing layer material can be used for forming a polyurethane wearing layer, so that normal-temperature construction can be realized, the polyurethane wearing layer material is quickly solidified, and the energy consumption and the greenhouse gas emission in the construction process are greatly reduced. The polyurethane wearing layer not only improves the pavement service quality and service life, but also is beneficial to transformation and upgrading of the road traffic industry to the green low-carbon direction.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Unless otherwise indicated, the starting materials and reagents used in the following examples were either commercially available or may be prepared by known methods. The examples are not intended to identify the particular technology or conditions, and are either conventional or are carried out according to the technology or conditions described in the literature in this field or are carried out according to the product specifications. The reagents and instruments used, etc. are not identified to the manufacturer and are conventional products available for purchase by regular vendors.

Example 1

The preparation method of the polyurethane wearing layer material comprises the following steps:

(1) Preparing materials:

Aggregate: coarse and fine aggregate provided by Tongzhou asphalt plant of Beijing municipal road and bridge building material group Co., ltd, the grading is as follows

Table 1;

Diamine curing agent: XY-3767, a new material stock of Hunan, inc.;

polyurethane prepolymer: polyurethane prepolymers are supplied by Wanhua chemical groups Co., ltd, consist essentially of isocyanate and polyether polyol, and have an NCO content of 8%.

Catalyst: dibutyl tin dilaurate of national pharmaceutical group chemical reagent company, inc;

mineral powder: mineral powder with water content not more than 0.5% provided by Tongzhou asphalt plant of Beijing municipal road and bridge building material group Co.

Rubber powder: the water content of the 80-mesh tread rubber powder is less than 1%, and the metal content is less than 0.5%.

(2) And (3) aggregate drying: drying the coarse and fine aggregates in a drying oven at 105 ℃ for at least 4 hours until the moisture content is not more than 0.05%;

Preparing a polyurethane adhesive: adding diamine curing agent into polyurethane prepolymer, stirring uniformly, then continuously adding catalyst into the polyurethane prepolymer, stirring uniformly to obtain polyurethane adhesive. Wherein the mass percentage of diamine curing agent in the polyurethane adhesive is 2.0%, and the addition amount of the catalyst is 0.5% of the polyurethane prepolymer.

(3) Dry-mixing for 20s according to the proportion of the determined coarse aggregate and the determined fine aggregate to obtain a dry-mixed mixture;

(4) Polyurethane adhesive was weighed according to 4.5% gum Dan Bi and added to the dry mix and mixed for 50s.

(5) Adding mineral powder and rubber powder into the mixture obtained in the step (4), and continuously stirring for 50s to obtain a polyurethane wearing layer material; wherein the addition amount of mineral powder is 1%, and the addition amount of rubber powder is 1.0% of the mass of the coarse and fine aggregates.

Further, road construction is carried out on the polyurethane wearing layer material, and the macroporous polyurethane wearing layer with the thickness of 1.5cm is obtained.

Marshall test pieces of polyurethane wearing layer materials and rutting plate test pieces of polyurethane wearing layer materials are molded at normal temperature according to the asphalt mixture test piece manufacturing method (T0702) in highway engineering asphalt and asphalt mixture test procedure (JTG E20-2011).

And curing the molded polyurethane wearing layer material test piece in a constant temperature and humidity box for 48 hours (the temperature is 25 ℃, the humidity is 70%RH + -5%RH) for 24 hours + -1 hour, and then curing the polyurethane wearing layer material test piece in a humidity 80%RH + -5%RH environment for 24 hours + -1 hour at the temperature of 50 ℃ + -3 ℃.

Example 2

Substantially the same as in example 1, the only difference is that: and (3) adjusting the gum-stone ratio in the step (3) to 5.0%.

Example 3

Substantially the same as in example 2, the only difference is that: and (3) adjusting the adding amount of the rubber powder in the step (4) to 2.0% of the mass of the coarse and fine aggregates.

Comparative example 1

Substantially the same as in example 1, the only difference is that: and (3) adjusting the gum-stone ratio in the step (3) to 5.5%.

Comparative example 2

Substantially the same as in example 2, the only difference is that: and (3) adjusting the mass percentage of the diamine curing agent in the polyurethane adhesive in the step (2) to be 1.0%.

Comparative example 3

Substantially the same as in example 2, the only difference is that: the polyurethane adhesive does not contain diamine curing agent, and rubber powder is not added in the step (4).

Comparative example 4

Substantially the same as in example 2, the only difference is that: the polyurethane adhesive does not contain diamine curing agent.

Comparative example 5

Substantially the same as in example 2, the only difference is that: in the step (4), no rubber powder is added.

Comparative example 6

Substantially the same as in example 2, the only difference is that: and (3) replacing the diamine curing agent in the polyurethane adhesive in the step (2) with 2-isopropyl-3-hydroxyethyl-1, 3-oxazolidine by equal mass.

Comparative example 7

Substantially the same as in example 2, the only difference is that: in the step (4), 10 mesh rubber powder is added.

The polyurethane wearing layer materials obtained in the above examples and comparative examples were tested for their application effect in large void fast-curing polyurethane wearing layers, specifically, with reference to the test methods related to the highway engineering asphalt and asphalt mixture test procedure (JTG E20-2011):

firstly, forming a Marshall test piece by adopting a compaction method; forming a track plate made of polyurethane wearing layer materials by adopting a wheel grinding method;

Then placing the test piece and the test mold together at the side in an RH environment with the humidity of 70%RH +/-5%for curing for 24 hours +/-1 hour, and then placing the test piece and the test mold in an RH environment with the temperature of 50 ℃ +/-3 ℃ and the humidity of 80%RH +/-5%RH for curing for 24 hours +/-1 hour;

the test piece side was then removed and placed on the ground, cooled at room temperature for at least 6 hours, and then demolded.

The Marshall stability (T0709), void fraction (T0708), leak out (T0732), dynamic stability (T0719), trabecular bending (T0715) and residual stability (T0709) were tested respectively.

The test results are shown in Table 2 below.

TABLE 2

It can be seen from examples 1, 2 and 1 that the void ratio of the polyurethane wearing layer test piece gradually decreases and the leakage loss gradually increases with increasing gum-stone ratio, and the leakage loss reaches 0.23% when gum Dan Bi% is 5.5%. According to the experience related to asphalt mixture wearing layers, the leakage loss is preferably controlled below 0.2%, so the gum-stone ratio of the polyurethane wearing layer material is preferably 4.7% -5.3%.

From example 2, comparative example 2 and comparative example 4, it can be seen that, as the latent curing agent increases, the marshall stability value of the polyurethane wearing layer test piece increases, and the void ratio increases, mainly because the latent curing agent can prevent the one-component polyurethane adhesive from reacting with water to generate carbon dioxide gas, so that the bubble defect in the adhesive is reduced, the performance of the polyurethane wearing layer test piece is improved, but the content of the polyurethane wearing layer test piece exceeds 1%, and more remarkable effect can be achieved.

From examples 2,3 and 5, it can be seen that the void fraction of the polyurethane wearing layer test piece gradually decreases as the rubber powder increases, and the fine rubber powder occupies part of the mixture void. In addition, the low Wen Xiaoliang maximum bending strain of the polyurethane wearing layer test piece increases and then decreases, mainly because a small amount of rubber powder provides elasticity and deformability for the polyurethane wearing layer test piece, but excessive rubber powder may have negative effects on the polyurethane wearing layer test piece.

As can be seen from examples 2, 3, 4, and 5, the trabecular bending test value is 5221.5 με when the diamine-based curing agent is not contained in the polyurethane adhesive, 570.7 με is increased compared to comparative example 3, and 1729.8 με is increased compared to comparative example 3 when the rubber powder is not contained in the mixture, 2776.6 με is increased compared to comparative example 3 when the diamine-based curing agent and the rubber powder are contained at the same time, and it is proved that the above-mentioned effects are further enhanced by the two. While in comparative example 6, no synergy was produced when other latent curing agents were used, in comparative example 7, if the rubber powder size was too large, the void fraction of the polyurethane wearing layer test piece increased, which was detrimental to the performance improvement of the polyurethane wearing layer test piece.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. The polyurethane wearing layer material is characterized in that glue Dan Bi is 4.7-5.3%, and the raw materials comprise: a single-component polyurethane adhesive containing diamine curing agent, rubber powder with more than 40 meshes and mineral aggregate; the mass percentage of the diamine curing agent in the single-component polyurethane adhesive is 1.5-2%; the amount of the rubber powder is 0.5-2% of the aggregate mass in the mineral aggregate.

2. The polyurethane wear layer material of claim 1, wherein the rubber powder is 60-100 mesh tread rubber powder, has a water content of less than 1%, and a metal content of less than 0.5%.

3. The polyurethane wear layer material of claim 1 or 2, wherein the one-component polyurethane adhesive consists essentially of a polyurethane prepolymer and a diamine-based curing agent;

the amine equivalent of the diamine curing agent is 135-145, and the moisture is less than or equal to 0.10%;

the NCO content of the polyurethane prepolymer is 5-9%.

4. A polyurethane wear layer material according to any one of claims 1 to 3, wherein the polyurethane prepolymer consists essentially of isocyanate and polyether polyol.

5. The polyurethane wear layer material of any one of claims 1-4, wherein the one-component polyurethane adhesive further comprises a catalyst in an amount of 0.5% by mass or less;

Preferably, the catalyst is an organotin-based catalyst, preferably dibutyltin dilaurate and/or stannous isooctanoate, more preferably dibutyltin dilaurate.

6. The polyurethane wearing layer material according to any one of claims 1 to 5, wherein the mineral aggregate includes mineral powder having a moisture content of not more than 0.5%;

Preferably, the mineral powder in the mineral aggregate accounts for 0.3-1% by mass.

7. The polyurethane wear layer material of any one of claims 1-6, wherein the mineral aggregate is graded PC-10.

8. A process for preparing a polyurethane wear layer material as claimed in any one of claims 1 to 7.

9. The method of making a polyurethane wear layer material of claim 8, comprising:

dry-mixing the coarse aggregate and the fine aggregate for 15-25 s to obtain a dry-mixed mixture;

adding the single-component polyurethane adhesive into the dry-mixed mixture, and stirring for 45-60 s to obtain a mixture;

and adding mineral powder and rubber powder into the mixture, and continuously mixing for 45-60 seconds to obtain the polyurethane wearing layer material.

10. The use of the polyurethane wearing layer material of any one of claims 1 to 7 in bridge deck pavement, tunnel pavement, highway special sections, urban expressways, signal light intersections;

preferably, the polyurethane wear layer has a thickness of 1.0 to 2.0cm.