JP4975607B2 - Light color binder, light color pavement construction method - Google Patents

Description

  The present invention relates to a light color binder applied to road pavement, waterproofing material, adhesive, and the like, and a light color pavement construction method, and in particular, a light color binder excellent in heating efficiency at the time of melting and use, and light color pavement construction Regarding the method.

  In general, asphalt binders are mixed with aggregates and the like and are widely used as road pavement materials. In road asphalt pavement construction, in order to improve the ease of construction, it is necessary to heat the asphalt binder to about 150 ° C. to 200 ° C. and mix it with the aggregate to improve fluidity and make it liquid. Then, this liquid asphalt binder and aggregate mixture is laid on the road, and the road surface is finished by compacting and rolling with a road roller or the like.

  In particular, in recent years, when color paving is performed on parks, sidewalks, and the like, light-colored binders that can be colored by adding pigments or the like have been used. The light-colored binder is a substitute for the dark-colored transparent asphalt binder manufactured by mixing petroleum resin, rubber, elastomer, petroleum heavy oil, etc., and as such a light-colored binder, for example, resin and / or heat There is one in which a plastic elastomer and a petroleum softener are blended at a predetermined ratio, and an antioxidant or the like is added as necessary.

  Such asphalt binders and light-colored binders are used not only for road paving, but also as waterproofing materials for preventing water leakage on the roofs of houses and rooftops of concrete buildings. In such waterproof construction, a method of forming a waterproof layer by spraying or pouring an asphalt binder or a light-colored binder that has been heated and melted into a place to be waterproofed is employed. Furthermore, it is also used as an adhesive applying its adhesiveness.

  That is, it is essential that the asphalt binder and the light-colored binder are heated and melted at the time of use in any case. Conventionally, a method of heating a binder by burning fossil fuel using a heating device such as a heater or a gas burner has been common.

  However, in such a heating method using a heating device such as a heater or a gas burner, the temperature of the heating part can be increased in a short time, while the part away from the heating part is caused by heat conduction or convection. Although the temperature increased, the rate of temperature increase was slower than the former. For this reason, in the binder, there has been a problem that the temperature difference between the heated portion and the portion away from the heated portion becomes large. If the heating part is heated more than necessary to raise the temperature of the part of the binder away from the heating part, the binder in the heating part will be excessively heated. Therefore, this excessively heated binder generates bad odor due to the generation of steam and smoke, and also causes deterioration of the binder itself, so it adversely affects the finish of the pavement and the performance of waterproofing materials and adhesives. It will be.

  For this reason, there has been a demand for a method that is excellent in heating efficiency when laying a mixture of asphalt binder or light-colored binder and aggregate on a road and that can be uniformly heated without causing a temperature difference as a whole. It was.

  In Patent Document 1, for the purpose of uniform heating of waterproofing asphalt roofing, a conductive or electromagnetically inductive particulate material such as a metal or its oxide is applied to the surface, and an eddy current is induced by induction of an alternating magnetic field. An asphalt waterproofing construction method using so-called electromagnetic induction heating that generates and heats has been proposed.

  Further, not only a method using electromagnetic induction heating but also a method of dielectrically heating a mixture of asphalt and aggregate (hereinafter referred to as asphalt mixture) has been proposed (for example, see Patent Document 2). In the technique disclosed in Patent Document 2, an asphalt mixture is heated using a high-frequency dielectric device.

  Similarly, in Patent Document 3 in which an asphalt mixture is dielectrically heated, the temperature rise when irradiating microwaves in which an asphalt binder is mixed with rocks that are inorganic is significantly higher than that in which such rocks are not mixed. It has been shown to rise.

  Further, as a similar technical idea, an asphalt recycle method is also disclosed in which an asphalt pavement generating material is conveyed while being subjected to induction heating treatment and mixed with a new asphalt mixture subjected to separate heat treatment in the next step (for example, (See Patent Document 4).

  Also disclosed is an apparatus that dielectrically heats asphalt with high heating efficiency (see, for example, Patent Document 5).

Furthermore, when manufacturing the heating asphalt mixture for pavement, the method of improving the absorption characteristic of the microwave with respect to the container for heating a compounding material is also proposed (for example, refer patent document 6).
JP-A-3-271450 JP 60-138104 A Japanese Examined Patent Publication No. 62-25801 Japanese Patent Laid-Open No. 7-197412 JP 2001-143862 A JP 10-266114 A

  However, the conventional asphalt mixture and the asphalt roofing heating method described above are merely induction-heated without any modification to the asphalt binder itself or without mixing any substances. In addition, in patent document 3, there exists description of improving the heating efficiency at the time of irradiating a microwave by mixing a rock with an asphalt binder as mentioned above, and improves the heating efficiency by the electromagnetic induction of an asphalt mixture. From the viewpoint, it can be said that the idea of mixing some substance in the asphalt binder is disclosed.

  However, the technique disclosed in Patent Document 3, which is a technique of mixing asphalt binder and rock or crushed stone, has been conventionally practiced as a method for producing road pavement materials, and particularly improves heating efficiency by dielectric heating. It cannot be said that it was disclosed from the viewpoint of making it happen. Furthermore, since the step of mixing rocks enters the construction process, the burden on the construction equipment and construction labor increases, and in order to mix the rocks uniformly, the stirring time of the asphalt binder mixed with rocks is prolonged. In addition, the increase in stirring labor is not a problem. Also, there are applications where rocks cannot be mixed with asphalt binders, such as waterproofing materials and adhesives, and asphalt before mixing rocks from the viewpoint of improving heating efficiency by dielectric heating of asphalt. There was a need for the binder itself to have dielectric heating performance when irradiated with electromagnetic waves.

  Therefore, the present invention has been devised in view of the above-mentioned problems, and the object is to improve the heating efficiency when irradiated with electromagnetic waves when heated and melted when using a light-colored binder. It is another object of the present invention to provide a light-colored binder that can be heated and that can achieve uniform heating as a whole, and a light-colored pavement construction method using the light-colored binder.

  In order to solve the above-mentioned problems, the present inventor has obtained a light color binder mixed with a light color aggregate having a high light reflectance, and a light color binder applied to waterproofing materials, adhesives, and the like. When an organic compound having a hydroxyl group is contained in the binder, the heating efficiency is improved by irradiating electromagnetic waves. Specifically, the hydroxyl group value is 1 mg KOH / g or more so that the hydroxyl value is 1 mg KOH / g or more. Inventing a light-colored binder characterized in that, when an organic compound having an organic compound is contained, an increase in temperature due to dielectric heating is promoted based on the hydroxyl group of the organic compound when irradiated with electromagnetic waves.

  That is, the light-colored binder according to claim 1 contains an organic compound having a hydroxyl group, has a hydroxyl value of 1 mg KOH / g or more, and is heated by dielectric heating based on the hydroxyl group in the organic compound when irradiated with electromagnetic waves. It is characterized by promoting the rise.

  The light-colored binder according to claim 2 contains a light-colored aggregate having a high light reflectance, and is a light-colored binder used for light-colored paving, containing an organic compound having a hydroxyl group, and having a hydroxyl value of 1 mgKOH / g. As described above, when electromagnetic waves are irradiated, the temperature increase due to dielectric heating is promoted based on the hydroxyl group in the organic compound.

  The light pavement construction method according to claim 4 is characterized in that the light-colored binder according to claim 2 is dielectrically heated by irradiating an electromagnetic wave, and the dielectric-heated light-colored binder and aggregate are mixed. .

  The light pavement construction method according to claim 5 lays the mixture of the light color binder according to claim 2 and the aggregate on the pavement road surface, irradiates the light color binder laid with electromagnetic waves, and flows It is characterized by flattening after being made.

  The light-color binder according to the present invention contains a light-color binder containing a light-colored aggregate having a high light reflectance, and a light-color binder applied to waterproofing materials, adhesives, and the like, and contains an organic compound having a hydroxyl group. When the hydroxyl value is 1 mgKOH / g or more and an electromagnetic wave is irradiated, the temperature rise by dielectric heating is promoted based on the hydroxyl group of the organic compound. That is, it contains an organic compound having a hydroxyl group, has a hydroxyl value of 1 mgKOH / g or more, and can have a polarity necessary to promote a temperature rise due to dielectric heating. For this reason, by irradiating such a bright color binder according to the present invention with electromagnetic waves, it becomes possible to promote the temperature rise by the heat generation of the bright color binder itself. In addition, since it is possible to raise the temperature of the entire object to be heated uniformly, it is possible to eliminate the temperature disparity in the light-colored binder, and in turn suppress the generation of odors that have been generated by local overheating. It becomes possible.

  Hereinafter, as a best mode for carrying out the present invention, a light-colored binder used for road pavement and the like will be described in detail.

  The present inventor has solved the above-mentioned problems, can improve the heating efficiency when irradiated with electromagnetic waves when heated and melted in use, and achieves uniform heating as a whole. In order to provide a binder, intensive experimental research was conducted. As a result, the present inventor has found that heating efficiency is improved by irradiating an electromagnetic wave when an organic compound having a hydroxyl group is contained in the light-colored binder. In addition, the present inventor specifically, when the hydroxyl value of the whole light-colored binder containing an organic compound having a hydroxyl group is 1 mgKOH / g or more, a significant temperature increase is caused when an electromagnetic wave of 2450 MHz is irradiated. Was found to be accepted. Furthermore, the present inventor has newly found that, when electromagnetic waves are irradiated, the temperature increase due to dielectric heating is promoted based on the hydroxyl group of the organic compound.

  Hereinafter, details of components constituting the light color binder to which the present invention is applied (hereinafter referred to as the present binder composition) and reasons for limiting the numerical values will be described.

Contains organic compounds with hydroxyl groups

  Any organic compound having a hydroxyl group may be used as long as it has a hydroxyl group, and alcohols and phenols may be used. Among these, glycerin, polyether, polyethylene glycol, higher alcohol, and a polymer thereof having a hydroxyl group are particularly desirable.

  The hydroxyl group is polarized negatively on the oxygen atom side and positively on the hydrogen atom side, and has a large dipole moment. For this reason, it becomes possible to make the whole binder composition of this invention take polarity by mixing the organic compound which has a hydroxyl group in a light-colored binder. As a result, when the electromagnetic wave is irradiated to the binder composition of the present invention as described later, it is possible to promote the temperature increase due to the dielectric heating due to the polarity.

In addition, it is thought that even if it is an organic compound containing ketone other than a hydroxyl group, an amino group, and carboxylic acid, dielectric heating can be promoted. In particular, formic acid (HCOOH, high volatility at a boiling point of 100 ° C.) expresses polarity with respect to carboxylic acid, and can promote dielectric heating. However, since formic acid is highly volatile, there is a problem that it is inferior in practicality. In addition, when there are more carbon atoms than acetic acid (CH ₃ COOH) or butyric acid (C ₂ H ₅ COOH), a dimer that slowly binds with two molecules is formed, the polarity is canceled, the heating effect is reduced, and the odor is bad. There is also a problem of releasing.

  For amino acids and ketones, the polar group is present not at the end or outer periphery of the molecule but inside (the center or inside of the molecular structure), so the dipole moment of the molecule as a whole is reduced and the heating effect is reduced.

  For this reason, it is desirable to add an organic compound having a hydroxyl group rather than an organic compound having a carboxylic acid, an amino acid, and a ketone.

Hydroxyl value is 1mgKOH / g or more

  The hydroxyl value referred to here represents how much hydroxyl group is contained in the whole binder composition of the present invention after the organic compound having a hydroxyl group described above is mixed. The hydroxyl value indicates the amount of potassium hydroxide required to neutralize acetic acid bonded to a hydroxyl group when 1 g of a sample is acetylated.

  This hydroxyl value can be measured based on JIS K1557-1. According to JIS K1557-1, the sample is made into a pyridine solution containing acetic anhydride, and the hydroxyl group is acetylated under reflux of pyridine. Imidazole is used as a catalyst to promote the reaction, excess acetylating reagent is hydrolyzed with water, and the resulting acetic acid is titrated with a standard solution of sodium hydroxide. The hydroxyl value is calculated from the difference in titer between the blank test and the sample test.

  When the hydroxyl value is less than 1 mg KOH / g, the ratio of hydroxyl groups in the binder composition of the present invention is too small, and therefore, when an electromagnetic wave is irradiated as will be described later, the expected increase in temperature due to dielectric heating is promoted. There is a problem that it is not possible to have the polarity necessary to achieve this.

  On the other hand, when the hydroxyl value is 200 mgKOH / g or more, the water resistance of the binder composition of the present invention decreases (the one with a large hydroxyl value has high affinity with water) for paving, waterproofing, Or the problem that the function as an adhesive falls will come out.

  Moreover, when using this invention binder composition for a road pavement, it can mix and use it with the bright color aggregate with a high light reflectivity. The light-colored aggregate here refers to a pigment or the like, and by containing this, the binder composition of the present invention can be given a desired color, and color paving can be realized. It becomes.

  Incidentally, the light-colored binder as the binder composition of the present invention is a violet transparent asphalt substitute produced by mixing petroleum resin, rubber, elastomer, petroleum heavy oil and the like.

  Moreover, when using this invention binder composition for a waterproofing material, an adhesive, etc., it is not necessary to mix special aggregate. When used by processing into a sheet shape such as a waterproof sheet or an adhesive sheet, a reinforcing material such as a nonwoven fabric may be used as a core material if necessary.

  The hydroxyl value is desirably 5 mgKOH / g or more. The reason is that by giving a hydroxyl value of 5 mgKOH / g or more, the proportion of hydroxyl groups in the binder composition of the present invention can be increased, and a temperature increase of 5 ° C. or more can be expected due to dielectric heating. This is because a very large dielectric heating effect can be obtained.

  Further, the binder composition of the present invention contains petroleum resin, petroleum-based solvent extract oil, an additive for adjusting the hydroxyl value, and if necessary, a thermoplastic elastomer.

  Petroleum-based solvent extract oil is an oil extracted in the process of solvent extraction when producing lubricating oil from crude oil, and is an oily substance rich in aromatics and naphthenes ("until petroleum products are made", FIG. 6-1 “General Lubricating Oil Production Process”, published by Japan Petroleum Federation, November 1971, p. 99, and “New Petroleum Dictionary”, Petroleum Society, 1982, p. 304). This petroleum solvent extracted oil is a component that acts as a softener when added to the binder composition of the present invention, has a boiling point of 350 ° C. or higher, a viscosity at 100 ° C. of 5 to 100 mPa · sec, and a flash point of 250. It is desirable that the aromatic content is 75.0% by mass or more at a temperature of 0 ° C. Examples of such petroleum solvent extraction oil include bright stock solvent extractables extracted with a solvent such as phenol, N-methylpyrrolidone, liquid sulfur dioxide, and furfural in a crude oil refining process.

  Furthermore, you may make it mix petroleum resin, a thermoplastic elastomer, etc. with this invention binder composition.

  Petroleum resin is a polymer of unsaturated hydrocarbons present in the pyrolysis fraction in the petroleum refining process, has a molecular weight of about 100 to 2000, generally 200 to 1500, and a softening point of about 60 to 150 ° C. It is a pale yellow material. A hydrogenated petroleum resin in which hydrogen is added to a double bond in the molecule of such an unhydrogenated petroleum resin can also be used. The softening point of this hydrogenated petroleum resin is usually about 90 to 130 ° C. These hydrogenated petroleum resins and non-hydrogenated petroleum resins are components that act as structural members in the binder composition of the present invention.

  The thermoplastic elastomer is preferably a linear or branched block copolymer in which the end segment is a polystyrene segment and the rubber component segment is a segment such as polybutadiene or polyisoprene. Examples of such thermoplastic elastomers include SBS (styrene-butadiene-styrene block copolymer), SIS (styrene-isoprene-styrene block copolymer), and the like. These act as structural materials and are components that impart flexibility to the binder composition of the present invention.

  Hydrogenated thermoplastic elastomer is a hydrogenated addition of a diene block double bond in the molecule of an unhydrogenated thermoplastic elastomer, which acts as a structural material and imparts flexibility to the binder composition of the present invention. It is an ingredient to do.

  The hydrogenated thermoplastic elastomer blended in the binder composition of the present invention is not specifically limited as long as the hydrogenation rate is 95% or more, but the end segment is a polystyrene segment, and the rubber component segment is A chain or branched block copolymer which is a segment not containing a double bond, such as polyethylene and polybutylene, is preferable. Examples of such a hydrogenated thermoplastic elastomer include SEBS (styrene-ethylene-butylene-styrene block copolymer), SEPS (styrene-ethylene-propylene-styrene block copolymer), and the like. Among these block copolymers, the molecular weight is 50000 or more, the MFR (melt flow rate) (200 ° C., 5 kg) is 10 g / min or less, the polystyrene content is 10 to 50% by mass, and the specific gravity is 0.9 or more. Are more preferred.

  Further, in the binder composition of the present invention, various additives such as a lubricating oil can be blended for viscosity adjustment or transparency improvement.

  The above-described binder composition of the present invention is merely an example, and the present invention is not limited to this. For example, a lubricating base oil may be used instead of the oil-based solvent extract oil. Of course, any known light color binder may be applied. For example, in the binder composition of the present invention, for example, the binder composition described in paragraph [0023] in known JP-A No. 11-349816, or the binder composition described in paragraph [0031] in JP-A No. 2001-172469. May contain an organic compound having a hydroxyl group, and the hydroxyl value may be adjusted to 1 mgKOH / g or more.

  Next, a method for actually paving the road using the binder composition of the present invention having the above-described configuration will be described in detail below.

  First, the binder composition of the present invention is prepared. At this time, the organic compound which has a hydroxyl group with respect to the general light-colored binder comprised from the petroleum resin mentioned above, petroleum-based solvent extraction oil, and a thermoplastic elastomer as needed is contained. At this time, it is desirable to heat them to about 150 ° C. and simultaneously stir them with a mixer for about 30 minutes. At this time, the addition amount of the organic compound having a hydroxyl group needs to be adjusted so that the hydroxyl value of the obtained binder composition of the present invention is 1 mgKOH / g or more. The measurement method of the hydroxyl value at this time is measured based on JIS K1557-1 as mentioned above.

  Next, an electromagnetic wave is irradiated to the binder composition of the present invention by an electromagnetic wave irradiation device. The frequency of the electromagnetic wave to be irradiated may be any frequency, but may be 2450 MHz, for example, as in the general electromagnetic range. By irradiating the binder composition of the present invention with electromagnetic waves, it can be dielectrically heated, and can be heated almost uniformly to about 150 ° C. to 200 ° C. to improve fluidity and make it liquid. .

  Thereafter, in the same manner as conventional road pavement, this liquid binder composition of the present invention and aggregate adjusted to a predetermined particle size are mixed, transported to the road to be paved, and laid on the road The road surface is then finished by compacting with a road roller and rolling.

  In the present invention, a road pavement may be constructed as follows. The binder composition of the present invention is transported to the road to be paved. Next, an electromagnetic wave is irradiated to the binder composition of the present invention by an electromagnetic wave irradiation device. By irradiating the binder composition of the present invention with electromagnetic waves, it can be dielectrically heated, and can be heated almost uniformly to about 150 ° C. to 200 ° C. to improve fluidity and make it liquid. . Next, an appropriate aggregate is spread on the liquid binder composition of the present invention, and the road surface is finished by compacting and rolling with a road roller or the like.

  At this time, for example, the binder composition of the present invention may be accommodated in a dielectric heating apparatus as shown in Japanese Patent Application Laid-Open No. 8-13414, transported to the site while being dielectrically heated, and laid on the road. .

  The binder composition of the present invention is transported to the road to be paved, and after the aggregate is rubbed thereon, the electromagnetic wave irradiation device is used to irradiate electromagnetic waves, and the binder composition of the present invention is heated to form this liquid composition. It is also possible to finish the road surface by compacting and rolling the aggregate with a road roller.

  Furthermore, in the present invention, by irradiating the mixture of the binder composition of the present invention and aggregate once laid on the road with electromagnetic waves, this is heated to a uniform temperature, compacted with a road roller or the like, and rolled. The road surface may be finished and then cooled. At this time, for example, using the dielectric heating device described in Patent Document 5, the binder composition of the present invention laid on the road may be dielectrically heated.

  Further, in the present invention, the binder composition of the present invention and aggregate are mixed in advance, and then stored at room temperature, heated by dielectric heating at the time of road paving to have fluidity, transported to the paving site, and a conventional road paving method. It may be laid on the road. Alternatively, the mixture of the binder composition of the present invention stored at room temperature and the aggregate is transported to the road pavement site at room temperature, laid on the road, and then heated by dielectric heating to have fluidity, so that the conventional road You may make it lay on the road by the pavement method.

  In the conventional heating method using a heating device such as a heater or a gas burner, the temperature rises due to convection or heat conduction, whereas in the dielectric heating method applied in the present invention, the binder composition of the present invention itself The temperature rise can be promoted by heat generation.

  Specifically, the binder composition of the present invention irradiated with an electromagnetic wave of about 2450 MHz vibrates based on the electromagnetic wave applied by the molecules therein. That is, the molecules in the binder composition of the present invention are aligned based on the positive charge and the negative charge of the electromagnetic wave. Since this electromagnetic wave is composed of short waves of 2450 MHz, the time interval for vibrating positively or negatively is very short. For this reason, the alignment direction of the molecules in the binder composition of the present invention changes drastically at short time intervals. As a result, frictional heat is generated between the molecules, and the binder composition itself of the present invention can be heated. Become. That is, by irradiating the binder composition of the present invention with electromagnetic waves, the internal molecules can be shaken and heated by frictional heat generated by the molecules.

  In particular, the binder composition of the present invention contains an organic compound having a hydroxyl group. Thereby, it becomes possible to make the change of the alignment direction between the molecules by the irradiated electromagnetic wave more intense due to the polarity of the hydroxyl group. As a result, the presence of this hydroxyl group makes it possible to further increase the frictional heat between the molecules.

  In particular, since the hydroxyl value of the entire binder composition of the present invention is adjusted to be 1 mgKOH / g or more, the proportion of hydroxyl groups in the light-colored binder is not too small, and when heated by electromagnetic waves, dielectric heating is performed. It becomes possible to have the polarity necessary to promote the temperature rise due to the. Specifically, when the electromagnetic wave having the above-mentioned frequency is irradiated, the binder composition of the present invention can be heated at a temperature of about 4 ° C. or higher compared to a light-colored binder to which no organic compound having a hydroxyl group is added. it can.

  That is, when the electromagnetic wave having the same frequency is irradiated, the binder composition of the present invention can improve the heating efficiency as compared with a light-colored binder to which no organic compound having a hydroxyl group is added. In addition, this dielectric heating only heats the binder composition of the present invention itself, and does not require heat transfer as in a conventional heating device using a burner or the like. The temperature can be increased smoothly, and the temperature of the entire object to be heated can be increased uniformly.

  In addition, when this electromagnetic wave is irradiated, the binder composition itself of the present invention as the object to be heated can be raised in temperature, so that energy for heating up the furnace body, atmosphere, etc. is unnecessary, and comprehensive Energy efficiency can be improved.

Furthermore, the irradiation of the electromagnetic waves can be achieved by using electricity as an energy source to the end, so that emission of CO _{2 and the} like can be reduced. In addition, since uniform heating can be realized for the binder composition of the present invention, between a heating part and a part away from the heating part as in a heating method using a heating device such as a gas burner. The problem that the temperature gap becomes large can also be solved. As a result, it is possible to suppress the generation of bad odors by heating the heated part more than necessary to raise the temperature of the part away from the heated part, realizing more environment-friendly light pavement and light color binder heating It is also possible to do.

  Hereinafter, the effects of the present invention will be specifically described with reference to Examples and Comparative Examples. An example corresponding to the binder composition of the present invention is constituted by adding an additive composed of an organic compound having a hydroxyl group to an existing light-colored binder.

  As the existing light color binder, for example, the binder composition 1 disclosed in paragraph [0023] of JP-A-11-349816 may be applied.

  The binder composition 1 is composed of a petroleum solvent extraction oil, a petroleum resin, a thermoplastic elastomer, an anti-peeling agent, and the like.

  Petroleum solvent extract oil: Viscosity at 100 ° C. is 68 centistokes, aromatic content is 33 wt%, naphthene content is 26 wt%, paraffin content is 41 wt%, and flash point is 254 ° C. This petroleum solvent extract oil contains 63.4% by weight.

  Petroleum resin: Petroleum resin made from C9 fraction. Its properties are a softening point of 140 ° C., an acid value of 0.1 or less (mgKOH: JIS K0070), a bromine number of 25 (g: JIS K2543), and an average molecular weight of about 1000. (GPC method, converted to polyethylene). This petroleum resin is contained 32.1% by weight.

  Thermoplastic Elastomer: A styrene-butadiene-styrene block copolymer thermoplastic elastomer having a specific gravity of 0.94, a hardness (Shore A) of 72, a solution viscosity of 4000 cps (a polymer concentration of 25 wt% toluene solution, 25 ° C. ). This thermoplastic elastomer is contained in an amount of 4.5% by weight.

  Anti-peeling agent: acid value 190 (mgKOH: JIS K0070), iodine value 110, consisting of 7% by weight of monomeric acid having 18 carbon atoms, 76% by weight of dimer acid having 36 carbon atoms, and 7% by weight of trimer acid having 54 carbon atoms In the mixture, the average molecular weight is about 590. This anti-peeling agent is contained in an amount of 0.3% by weight.

  For example, the binder composition 2 disclosed in paragraph [0031] of JP-A No. 2001-172469 may be applied to the existing bright binder.

  This binder composition 2 is composed of petroleum solvent extracted oil, petroleum resin, thermoplastic elastomer, anti-peeling agent and the like.

  Petroleum solvent extraction oil: viscosity at 100 ° C. is 68 cps, aromatic content is 33% by weight, naphthene content is 26% by weight, paraffin content is 41% by weight, and flash point is 254 ° C. This petroleum solvent extract oil contains 49.7% by weight.

  Hydrogenated petroleum resin: Hydrogenated petroleum resin made from dicyclopentadiene (DCPD), softening point 130 ° C., bromine number 3 (g: JIS K 2543), average molecular weight about 500 (GPC method, polyethylene conversion) It is. Hydrogenated petroleum resin is contained by 47% by weight.

  Hydrogenated thermoplastic elastomer: a thermoplastic elastomer of styrene-ethylene-butylene-styrene block copolymer, having properties of a specific gravity of 0.91, hardness (Shore A) 76, solution viscosity of 1000 cps (polymer concentration of 10% by weight of toluene) Solution, 25 ° C.). The hydrogenated thermoplastic elastomer is contained at 3% by weight.

  Anti-peeling agent: From acid value 190 (mgKOH: JIS K0070), iodine value 110, C18 monomer acid 7% by weight, C36 dimer acid 76% by weight, C54 trimer acid 7% by weight The average molecular weight is about 590. The anti-peeling agent is contained in an amount of 0.3% by weight.

  For example, the binder composition 3 disclosed in paragraph [0022] of Japanese Patent No. 3727829 may be applied to the existing bright binder.

  The binder composition 3 contains 37.1 parts by weight of paraffinic process oil (trade name PW-380, manufactured by Idemitsu Kosan Co., Ltd.), hydrogenated petroleum resin (manufactured by Idemitsu Petrochemical Co., Ltd., trade name: I-Marp P-125). ) 58.0 parts by weight, 5.0 parts by weight of hydrogenated styrene-based thermoplastic elastomer (SEBS) (trade name Tuftec H1041 manufactured by Asahi Kasei Kogyo Co., Ltd.) at 170 to 180 ° C. with heat melting and mixing.

  As the organic compound having a hydroxyl group, additives 4 to 7 may be applied.

Additive 4: Glycerin (C ₃ H ₈ O ₃ ), molecular weight 92.1, hydroxyl value 1820 mgKOH / g.

  Additive 5: Polyether having a molecular weight of about 850 and a hydroxyl value of 380 mgKOH / g. (Polyether O-850 manufactured by Toho Chemical Co., Ltd.)

  Additive 6: Polyether having a molecular weight of about 500 and a hydroxyl value of 400 mgKOH / g. (Polyether PE-555 manufactured by Toho Chemical Co., Ltd.)

  Additive 7: Polyether having a molecular weight of about 1000 and a hydroxyl value of 250 mgKOH / g. (Polyether OB-1010 manufactured by Toho Chemical Co., Ltd.)

  Any one of the additives 4 to 7 is mixed with any of the binder compositions 1 to 3 described above at 150 ° C. for 30 minutes using a homomixer. Then, 30 g of the mixed sample was put in a 50 ml beaker, and an electromagnetic wave of 2450 MHz was irradiated for 180 seconds using a microwave oven with a high frequency output of 500 W. The hydroxyl value before and after heating was measured based on JIS K1557-1. Moreover, the temperature rise by electromagnetic wave irradiation measured the temperature before a heating and the temperature after a heating with a radiation thermometer (a radiation rate is set to 0.95), and calculated | required the temperature difference as a temperature rise.

  Table 1 shows the relationship between the hydroxyl value (mgKOH / g) and the rising temperature (° C.) of Examples 1 to 8 and Comparative Examples 1 to 3. The temperature rises in Table 1 are displayed separately for those based on the temperature before heating and those based on the temperature rise in Comparative Example 2.

  Incidentally, Examples 1-8 mix | blend any one of the additives 4-7 with any of the binder compositions 1-3, respectively.

  Example 1 contained 99% by weight of binder composition 2 and 1% by weight of additive 4 and had a hydroxyl value of 18.28 mgKOH / g. Example 2 contained 99.7% by weight of binder composition 2 and 0.3% by weight of additive 5 and had a hydroxyl value of 1.14 mgKOH / g. Example 3 contained 99% by weight of binder composition 2 and 1% by weight of additive 5 and had a hydroxyl value of 3.8 mgKOH / g. Example 4 contained 98% by weight of binder composition 2 and 2% by weight of additive 5, and had a hydroxyl value of 7.6 mgKOH / g. In Example 5, 96% by weight of the binder composition 2 and 4% by weight of the additive 5 were contained, and the hydroxyl value was 15.2 mgKOH / g. Example 6 contained 98% by weight of binder composition 2 and 2% by weight of additive 6 and had a hydroxyl value of 8.0 mgKOH / g. In Example 7, 96% by weight of binder composition 2 and 4% by weight of additive 6 were contained, and the hydroxyl value was 16 mgKOH / g. Example 8 contained 96% by weight of binder composition 2 and 4% by weight of additive 7 and had a hydroxyl value of 10 mgKOH / g.

  In Comparative Examples 1 to 3, only the binder compositions 1 to 3 are composed of 100% by weight, and no additives 4 to 7 are added. That is, Comparative Example 1 is composed of 100% by weight of the binder composition 1, Comparative Example 2 is composed of 100% by weight of the binder composition 2, and Comparative Example 3 is composed of the binder composition. 3 is composed of 100% by weight. In Comparative Examples 1 to 3, all were 0 mgKOH / g.

  As shown in Table 1, the rising temperatures of Comparative Examples 1 to 3 were all around 10 ° C. On the other hand, in all of Examples 1 to 8, the rising temperature was 14.7 ° C. or higher. Moreover, in these Examples 1-8, the raise temperature difference on the basis of the comparative example 2 was 4.5 degreeC or more. For this reason, if the hydroxyl value is 1.14 mgKOH / g or more, there is a temperature rise of at least 4.5 ° C. or more, and the heating efficiency can be improved.

  The reason why the temperature rise of 4.5 ° C. or higher is significant will be described below. In Comparative Example 3 in which the hydroxyl value is 0, the temperature rise due to electromagnetic wave irradiation is 0.4 ° C. lower than that in Comparative Example 1. Since the hydroxyl values of both Comparative Examples 1 and 3 are 0 mgKOH / g, the difference in these elevated temperatures is considered to be a measurement error. For this reason, it is considered that the test results include a test error of about 0.4 ° C. Therefore, it is judged that the heating efficiency is particularly excellent when the temperature difference is about 4 ° C. or more, which is 10 times the test error 0.4 ° C.

  However, it is not necessary that the hydroxyl value is strictly 1.14 mgKOH / g or more, and if it is 1 mgKOH / g or more, it is considered that the expected temperature rise occurs.

  Examples 2 and 3 all have a hydroxyl value of 5 mgKOH / g or less, but the temperature rise is small, and the difference in temperature rise based on Comparative Example 2 is less than 6 ° C. Compared with the other examples. It was a low temperature rise. In Examples 1, 5, and 7 each having a hydroxyl value of 15 mgKOH / g or more, the temperature rise was large, and the temperature difference based on Comparative Example 2 was also a high temperature rise of 20 ° C. or more.

Claims (4)

Containing an organic compound having a hydroxyl group,
The hydroxyl value is 1 mg KOH / g or more,
A bright-colored binder that promotes a temperature rise due to dielectric heating based on hydroxyl groups in the organic compound when irradiated with electromagnetic waves. In light color binder that contains light aggregate with high light reflectance and is used in light color pavement,
Containing an organic compound having a hydroxyl group,
The hydroxyl value is 1 mg KOH / g or more,
A bright-colored binder that promotes a temperature increase due to dielectric heating based on hydroxyl groups in the organic compound when irradiated with electromagnetic waves. A method for constructing a light pavement, comprising subjecting the light-colored binder according to claim 2 to dielectric heating by irradiating an electromagnetic wave, and mixing the dielectric-heated light-colored binder and aggregate.   A light color characterized in that a mixture obtained by mixing a light color binder and an aggregate according to claim 2 is laid on a road surface for paving, and the light color binder thus laid is irradiated with electromagnetic waves and fluidized to be flattened. Pavement construction method.