JP4807772B2 - Coating material for asphalt pavement surface and method for treating asphalt pavement surface - Google Patents

Description

  The present invention relates to a coating material for an asphalt pavement surface and a method for treating the asphalt pavement surface.

Asphalt pavement is the most paved road and very good. Furthermore, recently, permeable asphalt (including drainage asphalt in which the ground is not permeable, the same applies hereinafter) has been used from the viewpoint of accidents caused by hydroplaning due to rainwater, noise problems, and the like.
In this method, voids are provided between aggregates by adjusting the particle size and distribution of the aggregate to be used and reducing asphalt emulsion. Water penetrates downward through the gaps and absorbs sound waves that cause noise. However, inevitably aggregate for this gap withdrawal faster damage scattered easily pavement.

  Therefore, it has been practiced to apply resin mortar as a reinforcing material to the asphalt pavement surface. This resin mortar prevents the separation and scattering of the aggregate. Such a resin mortar is an acrylic resin urethane resin or the like due to a problem of curing or the like.

  Such resin mortar and asphalt inherently have poor adhesion, and there are problems such as partial lifting, movement, and peeling when simply coated on asphalt. Therefore, in many cases, a primer is applied to supplement the adhesive force, and a resin mortar is applied thereon.

When solvent type resin is used as a primer to be applied to such asphalt, a volatile solvent is a problem, and it has a strong affinity for asphalt and it remains, and after applying the primer, There was a problem that the upper coating material had to be applied within a short time.
Therefore, a solvent-free two-component polyurethane resin as disclosed in Patent Document 1 has been proposed, which solves the problem of solvent and improves the fast curing. However, the strength as a resin is difficult to develop, and the adhesion strength as a primer is not sufficient. In order to improve the adhesion strength, silica sand is mixed or silica sand is sprayed on the surface of the primer layer. However, this is not sufficient, and conversely, there is a problem of increasing viscosity by mixing silica sand.
JP 2003-175362 A

  Of course, an epoxy primer is also considered, but the curing rate at a low temperature is slow, and if it becomes 5 to 10 ° C. or lower, it cannot be practically used.

  Then, the coating material of the asphalt pavement surface which does not have such a fault and can be used as an excellent primer, and a treatment method for the asphalt pavement surface are provided.

  In view of the above situation, the present inventor has completed the asphalt pavement surface coating material and the asphalt pavement surface treatment method of the present invention as a result of earnest research, and the feature thereof is the coating material. Is a point in which a modified epoxy resin emulsion, an isocyanate compound, and cement powder are mixed, and in the treatment method, the coating material according to claim 1 is applied to a water-permeable asphalt surface (a method such as spraying, spraying, or brushing). ), Or after applying the coating material, the resin mortar containing the resin and the aggregate as essential components is scraped and coated or laminated.

Here, the modified epoxy resin is a reaction product of an epoxy compound having two or more epoxy groups at the terminal or a mixture of the substance and an epoxy compound having one epoxy group at the terminal and a fatty acid. By reacting with these, a large number of OH groups are present in the molecule. Therefore, in principle, no reactive epoxy group remains.
As the epoxy compound, a reaction product of bisphenol A or F and epichlorohydrin is suitable. The epoxy compound is a compound of a fatty acid. At this time, the fatty acid is preferably a hydroxycarboxylic acid.

  Further, a plurality of modified epoxy resins may be used in combination. The molecular weight of these modified epoxy resins is preferably about 200 to 1000.

Ｒ1は芳香族構造を示し、Ｒ2、Ｒ3、Ｒ4、Ｒ5、は脂肪族構造を示す。

Ｒ6は芳香族構造を示し、Ｒ7、Ｒ8は脂肪族構造を示す。 Especially, the mixture of the compound represented by following (1) and (2) is suitable. The mixing ratio of the two is arbitrary, but (1) is preferably about 50 to 150 parts by weight with respect to 100 parts by weight.

R1 represents an aromatic structure, and R2, R3, R4, and R5 represent aliphatic structures.

R6 represents an aromatic structure, and R7 and R8 represent an aliphatic structure.

  Among these compounds, R 1 and R 6 are bisphenol A or F, and R 2, R 3, R 4, R 5, R 7 and R 8 preferably have about 2 to 5 carbon atoms.

  This modified epoxy resin is used as an emulsion. Therefore, water and a dispersant are necessary. The mixing amount is preferably about 65% by weight of resin component and about 35% by weight of water. Actually, water is about 30 to 100 parts by weight with respect to 100 parts by weight of the resin component, and plasticizers, pigments, and other commonly mixed materials may be mixed.

ｎは１〜数十程度。 The isocyanate compound is a compound having an NCO group, and among them, diphenylmethane-4,4′-diisocyanate (MDI), crude MDI, and the like are preferable. This is preferably about 25 to 35% as the NCO content. What is represented by the chemical formula (3) is MDI. Moreover, as a crude MDI, what is shown by Chemical formula 4 is suitable.

n is about 1 to several tens.

  In order to make this isocyanate compound easy to handle, a solvent for decreasing the viscosity may be added. The solvent at this time is preferably not an aromatic solvent but an ester solvent such as ethyl acetate or a ketone solvent such as acetone. In the case of aromatic ones (benzene, toluene, xylene, etc.), the asphalt emulsion is dissolved and the adhesive strength is remarkably reduced, or the asphalt aggregate is detached and scattered. As a mixing amount of the solvent, about 1 to 10% by weight is sufficient. Furthermore, silica sand or other inorganic fine particles may be mixed as an aggregate. About 0.5 to 25% by weight of the solvent mixture is appropriate for the total amount of the modified epoxy resin emulsion and the isocyanate compound.

  Cement is Portland cement, blast furnace cement, alumina cement or the like, and is an inorganic powder that hardens when kneaded with water.

  The mixing ratio of the modified epoxy resin emulsion, the isocyanate compound, and the cement powder is 100 to 180 parts by weight of the modified epoxy resin emulsion (including water) with respect to 100 parts by weight of the isocyanate compound, and 70 to 130 parts by weight of cement as well. It is.

  Depending on the amount of solvent and water, the viscosity can be adjusted appropriately to facilitate handling. The viscosity is preferably about 350 to 650 mPa · s.

  This invention is a coating material of the asphalt pavement surface which is said mixture. That is, it is applied to the asphalt pavement surface. The application method is arbitrary, and may be a spray device, a brush or a roller, or other ordinary ones.

Here, the method of applying resin mortar on the asphalt pavement surface is the following two types. It is a method in which the coating is applied by sliding into the surface layer gap of the water-permeable asphalt pavement, and a method in which the layer coating is applied to the surface layer of the water-permeable or non-water-permeable asphalt pavement.
The sliding coating method is a method in which the gap is mainly filled in the permeable asphalt pavement, which is the work surface, but as a rule it is not applied beyond the surface of the asphalt. Therefore, as a specific method, the resin mortar applied beyond the asphalt pavement surface is removed by coating the gap with a leveling tool and a rubbing tool (including a mechanical device). In this method, the height of the paved surface is not substantially changed.

  In the method of laminating and coating the surface layer of asphalt pavement or more, the gap on the asphalt pavement surface, which is the work surface, is filled to some extent, but it is applied 2 mm to several cm above the surface of the asphalt. . In this method, when there is a large unevenness on the asphalt pavement surface of the work surface, it can be corrected.

  The coating material of the present invention may be applied as a primer for coating other resin mortars, or may be applied as a final coating material on the surface of the coating material itself. Moreover, you may give the topcoat by other resin etc. on this invention coating material. This is a thin coating of the resin, and is for surface aesthetics, coloring, gloss, etc., or for protecting the surface and preventing contamination, and a colored resin or transparent resin is used depending on the application. Acrylic, urethane, epoxy, silicon resin, fluorine, etc. are common, but other resins may be used.

The resin of the present invention is cured by a polymerization reaction between the modified epoxy resin and isocyanate after coating. This is a reaction between an OH group and an NCO group, and condenses as shown in chemical reaction formula (5).

Therefore, NCO groups react with a large number of OH groups to form a planar or three-dimensional polymer rather than a linear molecule.
Moreover, the cement which is the big point of this invention reacts with the water of an emulsion, and makes a cement-like hardened | cured material. Therefore, it is not clear exactly what structure this polymer and hardened cement make up, but it has strong adhesion to inorganic materials and is also good for asphalt and other resins. Glue.
In addition, cement has the effect of stabilizing the resin emulsion, and can be applied uniformly.

  The present invention is for an asphalt pavement surface and may be any place as long as it is an asphalt pavement surface. For example, roads, bridges, parks, etc.

  Further, as a method of using the present invention, a resin mortar obtained by applying the coating material of the present invention to a water-permeable asphalt as a primer and mixing an elastic aggregate and a urethane binder on the water-permeable asphalt itself. There is a method of painting by asphalt. Here, the elastic aggregate is obtained by coating the surface of a rubber piece with a resin and an inorganic powder. As a primer in such a rub coating method, the coating material of the present invention in which cement is also blended is suitable.

  In particular, since the inorganic powder is fixed around the rubber piece, the adhesive strength with the coating material of the present invention is further strengthened, which is more suitable than that using a normal rubber aggregate.

The asphalt pavement surface coating material and the asphalt pavement surface treatment method of the present invention have the following great advantages.
(1) The emulsion raw material itself has good dispersibility and can be stored for a long time.
(2) Further, when used as a primer, the surface adhesion effect after application is maintained for a long time, so that the main coating such as rubbing can be performed even after a relatively long time has elapsed.
(3) The coating material of the present invention has very good adhesion to the asphalt surface, and also has good adhesion to the resin mortar to be further applied.
(4) The coating material itself of the present invention has good long-term stability and excellent strength.

  Hereinafter, it demonstrates in detail along an Example.

Example 1
Each component was mixed as follows and the coating material was prepared.
(1) Emulsion: 140 parts by weight
Modified epoxy resin: 100 parts by weight
Water: 40 parts by weight (2) Isocyanate: 100 parts by weight Crude MDI: 97 parts by weight Total of solvent, aggregate and pigment: 3 parts by weight (3) Cement (Portland cement): 100 parts by weight The modified epoxy resin has the chemical formula ( It is an equivalent (weight ratio) mixture of the compound shown in 1) and the compound shown in (2), R1 and R6 are bisphenol A, R2, R4 and R7 are butylene groups, and R3, R5 and R8 are methyl. It is a group. Here, partially modified MDI was used as the crude MDI. The average molecular weight is about 500 to 1000.
These three types were mixed and stirred to give Example 1.

Example 2
(1) Emulsion: 170 parts by weight
Modified epoxy resin: 120 parts by weight
Water: 50 parts by weight (2) Isocyanate: 100 parts by weight Crude MDI: 97 parts by weight Total of solvent, aggregate and pigment: 3 parts by weight (3) Cement (Portland cement): 125 parts by weight Modified epoxy resin and crude MDI are The one of Example 1 was used.
These three types were mixed and stirred to give Example 2.

Example 3
(1) Emulsion: 100 parts by weight
Modified epoxy resin: 72 parts by weight
Water: 28 parts by weight (2) Isocyanate: 100 parts by weight Crude MDI: 97 parts by weight Total of solvent, aggregate and pigment: 3 parts by weight (3) Cement (Portland cement): 70 parts by weight Modified epoxy resin and crude MDI The one of Example 1 was used.
These three types were mixed and stirred to give Example 3.

  Using these three coating materials as primers, the coating was applied on dense-grained asphalt concrete. The coating thickness is about 0.2 mm. After touch drying, 5 mm of resin mortar (acrylic resin) was applied on the top. The adhesive strength at this time was measured.

The adhesive strength was measured with a Kenken type tensile strength tester. The results are as follows.
Example 1: 1.28 N / mm ² (13.1 kgf / cm ² )
Example 2: 1.01 N / mm ² (10.3 kgf / cm ² )
Example 3: 0.98 N / mm ² (10.0 kgf / cm ² )
Comparative Example 1: 0.51 N / mm ² (5.2 kgf / cm ² )
In the comparative example, a primer was not applied, and the coating was applied directly to the asphalt surface.

  As described above, the adhesive strength is excellent and, of course, almost no solvent is contained, so there is no influence on the environment and human body, and there is almost no influence on asphalt.

Claims (5)

  A coating material for an asphalt pavement surface, wherein a modified epoxy resin emulsion, an isocyanate compound, and cement powder are mixed. The asphalt pavement surface coating material according to claim 1, wherein the modified epoxy resin is a mixture of compounds represented by the following formulas (1) and (2).

R1 represents an aromatic structure, and R2, R3, R4, and R5 represent aliphatic structures.

R6 represents an aromatic structure, and R7 and R8 represent an aliphatic structure.   The asphalt pavement surface coating material according to claim 1 or 2, wherein the isocyanate compound is MDI and / or crude MDI.   A method for treating an asphalt pavement surface, wherein the coating material according to claim 1 or 2 is applied to a water-permeable asphalt surface. After application of the coating material according to permeability asphalt surface to any one of claims 1 to 3, it is intended to coated or laminated coating narrowing sliding the resin mortar to the resin and the aggregate as essential components asphalt How to treat the painted surface.