JP2794632B2 - Construction method of materials including bitumen - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a new and useful construction method for materials including bituminous substances. More specifically, a specific polyisocyanate or a reactive mixture having a specific compounding ratio of the specific polyisocyanate and the polyol is added to a joint (adhesion surface) of a joint portion of the material including the bituminous substance, Or applying a specific isocyanate prepolymer obtained by the reaction of such a reactive mixture, particularly providing a construction site having excellent adhesion between materials including bituminous substances, and having good workability. The present invention relates to an extremely useful construction method for materials including bituminous substances.

[Conventional technology]

As a splicing method for such a material containing bituminous substances, in particular, asphalt-based material, a seam (adhesive surface) at the spliced portion is thermally fused, or
The so-called cutback asphalt, which is a form of asphalt diluted with gasoline, is used for such seams (adhesive surface)
There is known a method of applying the composition to a substrate.

However, in the method using heat fusion, although the bonding strength itself at the spliced portion is sufficient, the seam (bonded surface) must be heated and melted, and particularly in winter, a large amount of energy is required. The workability is disadvantageous in terms of construction cost (cost), and is subject to time constraints because the work must be completed promptly before the molten part cools and solidifies. There is also a disadvantage in terms of.

On the other hand, the method using cutback asphalt coating does not take any means such as heat fusion, but rather uses the cutback asphalt itself. Regardless of the surface, a high degree of adhesion cannot be expected on any of the surfaces, and in fact, the bonding strength at the joint portion obtained by such a cutback asphalt coating method is insufficient.

As described above, at present, a practical method has been found that has a sufficient adhesive strength and can also exhibit excellent workability as a method of joining bituminous substances, particularly asphalt-based materials. Not.

[Problems to be solved by the invention]

Therefore, in the present invention, it is an object of the present invention to provide a useful method for constructing a material containing a bituminous material, in which all the disadvantages of the various prior arts as described above have been solved, in other words, to provide a method for this kind of material containing bituminous material. The present invention provides an extremely useful construction material (coating agent) which is excellent in adhesiveness and workability, and which is extremely useful by using such a useful construction material or coating agent. The main focus is on providing construction methods.

Therefore, the problem to be solved by the present invention is to provide a very useful method of constructing a bituminous material-containing material, which has excellent adhesiveness between the materials including bituminous materials, and which can achieve excellent workability. To provide.

[Means for solving the problem]

Therefore, the present inventors have solved the above-described problems, that is,
As a result of intensive studies to solve each of various unresolved problems in the prior art, a specific polyisocyanate or a reactive mixture having a specific ratio of this specific polyisocyanate and polyol Or when a specific isocyanate prepolymer obtained by the reaction of such a reactive mixture is applied to a splicing site of a material containing bitumen, the adhesion between the bitumen-containing materials is excellent, and in addition, it is excellent. In order to find a very useful construction material that also exhibits excellent workability, that is, a coating agent, and at the same time, find a very useful construction method of the bituminous material-containing material, the present invention is completed here. It came to let.

That is, the present invention comprises applying diphenylmethane-4,4'-diisocyanate (hereinafter abbreviated as MDI) -based polyisocyanate to a joint (adhesion surface) of a joint portion of a material containing bitumen. It is an object of the present invention to provide a method of applying the bituminous material-containing material, or to allow a MDI-based polyisocyanate and a polyol to react at a specific ratio at a joint (adhesion surface) at a joint of the bituminous material-containing material. It is intended to provide a method for applying the bituminous material-containing material, which comprises applying the isocyanate prepolymer obtained by the above method.

Here, only particularly typical examples of the above-mentioned MDI-based polyisocyanate include carbodiimide-modified MDI, uretonimine-modified MDI, isocyanurate-modified MDI, and crude MDI.

On the other hand, if only typical polyols described above are exemplified, polyester polyols, polyether polyols, acrylic polyols, polybutadiene polyols, or castor oil derivatives, and the like, furthermore, ethylene glycol, diethylene glycol, propylene glycol And dipropylene glycol, butanediol, pentanediol, hexanediol or octanediol; or so-called low molecular polyols such as glycerin, trimethylolethane, trimethylolpropane, pentaerythritol, dipentaerythritol or sorbitol.

Among the polyols, the use of polybutadiene polyol is particularly desirable from the viewpoint of affinity for bituminous substances, especially for asphalt.

The use ratio between the polyisocyanate component and the polyol component as described above is suitably in a range where the equivalent ratio of NCO / OH exceeds 1, preferably 2 or more.

When the NCO / OH equivalent ratio is 1 or less, all of the isocyanate groups in the polyisocyanate are completely reacted with the hydroxyl groups in the polyol, and as a result, there is no free isocyanate group. From
It is not preferable because chemical interaction with the surface of the bituminous material cannot be sufficiently performed, and as a result, the adhesive strength is reduced.

In addition, the MDI-based polyisocyanate and polyol,
In the case of using a reactive mixture having a specific mixing ratio as described above, a so-called one-pack type isocyanate prepolymer in a form in which the specific reactive mixture is reacted in advance is used as a material for application ( Coating method), or such a reactive mixture as it is, a method of using it as a material for application (coating agent), or further, as described above, an MDI-based polyisocyanate component and a polyol component, Used as a so-called two-pack type in which each of these components is applied to the joint (adhesive surface) at the joint of the material containing bituminous material and then reacted on the joint (adhesive surface). It can take any form, such as a method of doing so.

Various construction materials (coating agents) as described above include, as necessary, various organometallic compounds such as dibutyltin dilaurate, dibutyltin acetate, cobalt naphthenate or zinc naphthenate, or various amines such as triethylamine. And organic or inorganic coloring pigments such as titanium oxide, red iron oxide, graphite or zinc white, carbon black or azo or copper phthalocyanine; leadtan, lead white, base Anticorrosive pigments such as basic chromate, basic sulfate, zinc chromate, zinc powder or MIO; or extender pigments such as precipitated calcium carbonate, precipitated barium sulfate, clay, talc, silica or mica. And a leveling agent, a hygroscopic agent, or a silane-based or titanate-based coupling It can also be added, such as.

Furthermore, of MDI-based polyisocyanate and polyol,
Various solvents such as toluene, xylene, ethyl acetate, butyl acetate or methyl ethyl ketone to reduce the viscosity of various working materials (coating agents) including the reactive mixture having a specific compounding ratio as described above: A petroleum diluent such as kerosene, light oil or heavy oil can also be used.

Furthermore, a plasticizer such as dibutyl phthalate, dioctyl phthalate or asphalt; or various resins such as a xylene resin or a vinyl resin can be used as long as the effects of the present invention are not impaired.

In addition, by laying fibrous material such as glass fiber or carbon fiber, aggregate such as stone powder, silica sand, crushed stone, fine sand, rough sand or crushed stone, etc.
Further, the effects of the present invention can be enhanced.

The MDI-based polyisocyanate thus obtained, or the two-component construction material composed of the MDI-based polyisocyanate and the polyol, or the reactive mixture of the polyisocyanate and the polyol in the specific mixing ratio as described above, respectively. Further, various construction materials (coating agents) such as one-pack construction materials using isocyanate prepolymers obtained by previously reacting these polyisocyanates and polyols at the above-mentioned specific mixing ratios are used asphalt. When applied to the construction of materials including bituminous substances, such as those described below, represented by system substances,
Various methods and means, such as flow coating, spraying, or roller coating, can be adopted. In that case, it is necessary to repeat the next layer within 24 hours after applying the various construction materials (coating agent). desirable.

Then, if only the typical representative material including the bituminous substance to which the method of the present invention is applied is given,
Examples thereof include those obtained by stirring and mixing the heated and melted straight asphalt and the aggregate, and those obtained by stirring and mixing the aggregate with a mixture of cutback asphalt and urethane resin.

The construction method of the present invention can be particularly effectively used when using a bituminous material or a material containing this bituminous material, such as pavement of a road and an airfield, roofing or waterproofing, and further, the surface of the bituminous material can be applied. It can be used even when the defective portion is repaired with bituminous material or other concrete, mortar, resin, or a resin composition thereof.

〔The invention's effect〕

According to the construction method of the present invention, various construction materials (coating agents)
The pot life is long, and therefore, after coating, the splicing can be performed for a long time, and the workability is good, and the obtained spliced part has a superior adhesive strength. Needless to say, it is particularly effective when using bituminous materials such as pavement on roads and airfields, roofing, and waterproofing.

〔Example〕

Next, the present invention will be described more specifically with reference to Examples and Comparative Examples. In the following, all parts and percentages are by weight unless otherwise specified.

Example 1 10 parts of heated and melted straight asphalt having a penetration of 60/80 and 90 parts of aggregate were stirred and mixed to obtain a material containing bitumen. Hereinafter, this is referred to as a bituminous material-containing material (B-
Abbreviated as 1).

Next, the material (B-1) was packed into a predetermined mold so that the density became 2.0 g / cm ^3, and a cured product of a first layer having a predetermined shape was obtained as shown in FIG. .

Thereafter, the cured product was allowed to air-cool to room temperature, and then the joint surface was brush-coated with a crude MDI at an application amount of 0.02 g / cm ² .

One hour later, as a second layer, a previously prepared heat-melted material (B-1) was spliced at a density of 2.0 g / cm ³ , allowed to air-cool to room temperature, and cooled to the first layer. A cured product having a predetermined shape as shown in the figure was obtained.

After leaving the cured product at room temperature for one week, the adhesiveness was evaluated by a bending test.

 The results are summarized in Table 1.

Example 2 135 parts of crude MDI, the number average molecular weight was 1,350, and
Polybutadiene polyol having an average number of hydroxyl groups per molecule of 1.8 [hereinafter abbreviated as polyol (P-1). 75 parts of NCO / OH at 80 ° C. for 3 hours in a nitrogen atmosphere, and further diluted with 53 parts of toluene to obtain an effective isocyanate group. An isocyanate prepolymer having a ratio of 14% was obtained.

Thereafter, in the same manner as in Example 1, the isocyanate prepolymer was brush-coated on the joint surface of the first layer made of the material (B-1) at an application amount of 0.01 g / cm ² .

Six hours later, the previously prepared heat-fused material (B-1) was spliced in the same manner as in Example 1, allowed to cool to room temperature, and left in a predetermined shape as shown in FIG. To obtain a cured product of the second layer.

The cured product thus obtained was subjected to a bending test in the same manner as in Example 1. As a result, the results shown in Table 1 were obtained.

Example 3 Heat-fused, straight asphalt having a penetration of 60/40, and diluted so that the weight ratio of heavy fuel oil A becomes 60:40, into 60 parts of so-called cutback asphalt,
Forty parts of the urethane resin are mixed with stirring, and then, with 10 parts of the mixture thus obtained, 90 parts of aggregate are mixed with stirring to obtain a material containing bituminous material [hereinafter abbreviated as material (B-2)]. . ] Was obtained.

Thereafter, in the same manner as in Example 1, this material (B-2)
Was packed in a mold so that the density became 1.8 g / cm ³ , to obtain a cured first layer having a shape as shown in FIG.

After leaving this cured product at room temperature for one week, the crude MDI
Was brush-coated on the joint surface at an application amount of 0.02 g / cm ² .

One hour later, a material (B-2) prepared in advance was spliced as a second layer at a density of 1.8 g / cm ³ to obtain a shape as shown in FIG. A cured product was obtained.

The cured product thus obtained was subjected to bending strength in the same manner as in Example 1. As a result, the results shown in Table 1 were obtained.

Example 4 95.3 parts of castor oil and 4.7 parts of glycerin were transesterified at 220 ° C. for 1 hour in the presence of 0.05 parts of lithium hydroxide to give a number average molecular weight of 650 and one molecule. Castor oil diglyceride having an average number of hydroxyl groups per unit of 2.8 was obtained.

Then, 23 parts of the diglyceride of castor oil and 41 parts of the crude MDI were stirred and mixed using an equivalent ratio of NCO / OH of 3 and immediately obtained in the same manner as in Example 3. The joint surface of the first layer of the material (B-2) containing the bituminous material thus obtained was brush-coated so that the coating amount was 0.01 g / cm ² .

Four hours later, as a second layer, this material (B-2) was spliced at a density of 1.8 g / cm ³ to form a first layer.
A cured product having a shape as shown in the figure was obtained.

This cured product was also subjected to a bending test in the same manner as in Example 1. As a result, the results shown in Table 1 were obtained.

Comparative Example 1 A material (B-1) having a density of 2.0 g was prepared in the same manner as in Example 1.
/ cm ^{3 into} a mold having a predetermined shape to obtain a cured first layer having the shape shown in FIG.

One hour later, as a second layer, the heat-fused material (B-1) was spliced at a density of 2.0 g / cm ³ ,
In other words, without using any construction material (coating agent), the joint is merely made by heat-sealing and left to cool to room temperature to obtain a cured product having a shape as shown in FIG. Obtained.

This cured product was also subjected to a bending test in the same manner as in Example 1. As a result, the results shown in Table 1 were obtained.

Comparative Example 2 A material (B-1) having a density of 2.0 g was prepared in the same manner as in Example 1.
/ cm ³ into a predetermined mold to obtain a cured first layer having a shape as shown in FIG.

Then, after leaving this cured product air-cooled to room temperature, the straight asphalt having a penetration of 60/80, and diluted so that the weight ratio of gasoline to 60:40, the so-called cutback asphalt, 0.02 g At the application amount of / cm ² , the joint surface was troweled.

One day later, as the second layer, the previously heated and melted material (B-1) was spliced at a density of 2.0 g / cm ³ , that is, any special construction material (coating agent) was used. Without using it, a joint was performed simply by using cutback asphalt, and the mixture was allowed to cool to room temperature to obtain a cured product having a shape as shown in FIG.

This cured product was also subjected to a bending test in the same manner as in Example 1. As a result, the results shown in Table 1 were obtained.

Comparative Example 3 In the same manner as in Example 3, the density of the material (B-2) was changed.
The mixture was packed in a mold so as to have a density of 1.8 g / cm ^3, and a cured product of a first layer having a shape as shown in FIG. 1 was obtained.

After leaving this cured product at room temperature for one week, the crude MDI
Was brush-coated on the joint surface at an application amount of 0.02 g / cm ² .

Further, 12 hours later, the material (B-
2) was spliced at a density of 1.8 g / cm ³ to obtain a cured product having a shape as shown in FIG.

Comparative Example 4 23 parts of castor oil diglyceride obtained in the same manner as in Example 4 and 10.8 parts of crude MDI, that is, NCO / O
After stirring and mixing so that the equivalent ratio H becomes 0.8, the material (B-2) obtained immediately in the same manner as in Example 3 was obtained.
Of the first layer was brush-coated so that the coating amount was 0.01 g / cm ² .

Four hours later, the material (B-
2) was spliced at a density of 1.8 g / cm ³ to obtain a cured product having a shape as shown in FIG.

The bending strength of the cured product itself including the bituminous material was 9k for the materials (B-1) and (B-2), respectively.
gf / cm ² and 25 kgf / cm ² .

As described above, according to the construction method of the present invention, a construction site having excellent bonding strength is provided while having a bending strength substantially equal to that of the material including bitumen itself. Therefore, it is known that the construction method of the present invention is extremely useful.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a joint state of each sample cured product in each example and a comparative example. After forming a first layer, a construction material or the like is applied to the joint surface. This is to show one embodiment in which the second layer is formed by coating. 11 ... first layer, 22 ... second layer, 33 ... joint surface.

──────────────────────────────────────────────────続 き Continuing the front page (72) Inventor Masatoshi Motomura 389-7 Nishihiro, Ichihara-shi, Chiba Prefecture (72) Inventor Yosuke Takahashi 4-4, Tatsumidaihigashi, Ichihara-shi, Chiba Prefecture (56) References JP-A-61-166873 ( JP, A) JP-A-57-168972 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) C09J 175/00-175/16 C09J 5/00-5/10 E01C 11 / 00-11/14 C08L 75/00-75/16 C08G 18/00-18/87

Claims (3)

(57) [Claims] In the construction of a material containing bituminous matter,
A method for applying a material containing bituminous matter, comprising applying diphenylmethane-4,4'-diisocyanate-based polyisocyanate to a joint or an adhesive surface of a joint portion of the material. 2. In constructing a material including a bituminous material,
A diphenylmethane-4,4'-diisocyanate-based polyisocyanate and a polyol are applied to a joint or an adhesion surface of a joint portion of the material, an equivalent ratio of an isocyanate group in the polyisocyanate to a hydroxyl group in the polyol: NCO / A method for applying a material containing bituminous matter, characterized by applying a mixture having a ratio of OH exceeding 1. 3. In constructing a material containing bituminous matter,
A diphenylmethane-4,4'-diisocyanate-based polyisocyanate and a polyol are applied to a joint or an adhesion surface of a joint portion of the material, an equivalent ratio of an isocyanate group in the polyisocyanate to a hydroxyl group in the polyol: NCO / A method for applying a material containing bituminous substances, characterized by applying an isocyanate prepolymer obtained by reacting OH at a ratio of more than 1.