MXPA97000072A - Composite and strip method for stripping the layer of roads or autopis - Google Patents

Abstract

The reported scoring compound provides rapid solidification on the road and superhighway layers. The scratch compound is a two-part system (part A and part B) to form polyurethane, which has characteristics of good adhesion to the layer of a road or superhighway, resistance to weather conditions and yellowing with the course of the weather. Part A contains an aliphatic polyol and part B contains an alpha polyisocyanate

Description

COMPOSITE AND STRIPED METHOD TO SCRATCH THE LAYER OF ROADS OR HIGHWAYS FIELD Field of the Invention This invention relates to a scratch compound for use in the road or highway securing layer, a method for marking or scratching the roadway or highway layer, and the resulting road or motorway that is scratched or marked. Scratch compound is a two-part polyurethane forming system that has rapid solidification properties; good adhesion characteristics to the roadway or highway layer; good resistance to inclement weather or abrasion; and resistance to ambering over time. BACKGROUND OF THE INVENTION Various scratching or marking compounds have been used on roads and highways for many years. The first class of scratch compounds used on roads and highways with some success were the alkyd-based paint compounds, such as those described in US Patent Nos. 2,289,732; 2,897,733; and 3,326,098. Alkyd-based paint compounds generally dry slowly and contain steric bonds that are susceptible to hydrolysis by the alkaline condition of roads. This hydrolysis causes, in part, that the paint applied has little resistance to wear. Accordingly, it is advisable to provide a scoring compound that has a faster hardening time and better wear resistance. Most alkyd-based paint compounds require a solvent or drying oil to be added to decrease the viscosity, so that the paint compound can be sprayed onto the road bonding layer. For example, see U.S. Patent No. 3,326,098. The presence of a solvent during the marking of the highway creates a pollution problem because the solvent evaporates in the atmosphere. Consequently, it is advisable to have a scratch compound consisting of 100% solids, and not containing solvents or drying oils. As an alternative to the alkyd-based paint compounds, scratch compounds free of epoxy bases were developed. The epoxy base scratch compounds are described in detail in U.S. Patent Nos. 4,088,633; 4,185,132; and 4,255,468. These scratch compounds are an important improvement over the previous alkyd-based paints, in terms of their alkalinity and resistance to wear, and also because they reduce the need to use solvents during their application. In particular, epoxy based scratch compounds are better to withstand immersion in water than alkyds. In addition, they provide better adhesion to glass spheres placed on roads, which is important to provide retroreflectivity at night. By adhering better to the glass spheres, they adhere better and for longer to the layer of the road. However, epoxy-based scratch compounds generally still require a long time to harden, especially in cold-firing layers. In addition, over time they harden and become brittle, and also tend to burn. As a result of the low rate of hardening of such epoxy-based scratch compounds, it is necessary to put cones along the scratch compound that is applied to the road bonding layer, to prevent cars traveling on the road. road pass over the compound not yet hardened. The need to place cones while hardening the epoxy-based marking compound increases the cost of scratching a road because a sufficient number of cones is needed to prevent cars and trucks from passing over the scratch compound before it solidifies, and also because it supposes the need to hire crews of workers to put the cones after the striped compound is applied and to collect them once the compound solidifies. In consecuenseIt would be advisable to mark the road with a fast solidifying compound, even in layers of cold roads, in order to eliminate the need to place cones and to improve the marking performance. In addition, it would be advisable to have a compound for fast solidification marking, which has good characteristics of adherence to the layer of the road or highway, which can withstand the inclemency of weather, which does not become too ambarious over time . SUMMARY OF THE INVENTION By means of the present invention, a scratch compound is provided for use on the road or highway road surface, a method for scratching the road surface of a highway or highway and the scratched road layer of a highway or highway. Scratch compound has fast hardening properties, has good adhesion characteristics to the roadway or highway layer; good resistance to inclement weather and abrasion; and resistance to ambering with the passage of time. The scratch compound for use in the tie layer of a highway or highway, according to the present invention, is prepared by a two-part polyurethane system, which contains a first part (part A) and a second part (part B). Part A with a component that contains the group that reacts to the isocyanate, and part B with a component that contains the isocyanate group. Parts A and B react to form a polyurethane system. Part A of the system forming the polyurethane can contain any polyol capable of reacting with the polyisocyanate of part B. The polyol component is selected based on the desired properties of the final polyurethane composition, in which adhesion, resistance to ambering, strength and flexibility, and also based on the desired properties of part A, among which viscosity and reactivity are included. In order to provide these properties, the polyol component can be a mixture of polyols. Useful polyols of part A preferably include compounds and polymers which are diols, triols and tetraols. The hydroxyl groups can be primary, secondary or tertiary. The polyol compounds and the polymers can be glycols, minor (Ci-Cio) or higher (Cu-C20) alkane polyols, polyether polyols, epoxy resins, and monosaccharides. Preferably, part A contains a mixture of polyols such as a mixture of secondary diol diether and a minor polyalkylene glycol. Preferably, the secondary diol diol is the propylene glycol propylene glycol and bisphenol A diether, and the lower polyalkylene glycol is tripropylene glycol. Part B of the polyurethane system can be any polyisocyanate capable of reacting with the Part A polyol to obtain a fast solidifying scoring compound with the desirable degree of adhesion to the roadway or superhighway adhesion layer, strength and flexibility and resistance to ambering over time, and which provides a B part with the desirable degree of reactivity and a sufficient viscosity to be used in commercial scribing or marking machinery without the need for solvents. It is possible to use mixtures of polyisocyanates. The aliphatic and cycloaliphatic polyisocyanates are desirable because they tend to produce polyurethanes with decreased ambering. The aliphatic polyisocyanate is preferably trimerized hexamethylene diisocyanate (HDI), a trifunctional isocyanate. To increase the reactivity and decrease the viscosity of part B, and obtain a harder polyurethane, any colorless or faint colored aromatic polyisocyanate can be used in combination with the aliphatic or cycloaliphatic polyisocyanate. The preferred aromatic polyisocyanate, due to its faint color, is diphenylmethane diisocyanate (for example, diphenyl ethane-2,4'- and / or -4,4'-diisocyanate). This component with aromatic polyisocyanate is especially advantageous when combined with trimerized hexamethylene diisocyanate. In general, if the scratch compound has not solidified it means that part A and B have not been combined, or that parts A and B have combined but their result is a solidified polyurethane system. When the scoring compound is not solidified a reflective filler may be added thereto in order to obtain a solidified scoring compound with the desired retroreflectivity. This invention indicates a method for scratching the affirmed layer of a highway or superhighway. This method involves combining the components of part A containing the group that reacts to the isocyanate and the components of part B that contain the group of isocyanates, to form a compound for scratching that operates by reaction, applying the compound for scratching that operates by reaction to the affirmed layer of a highway or superhighway and allowing the composite to scratch that operates by reaction to solidify and adhere to the affirmed layer of the highway or superhighway. If so desired, a reflective filler may be added to the scratch compound operating by reaction in order to achieve a retroreflectivity effect on the striped layer of the highway or striped superhighway. Parts A and B can be applied to the roadway layer or superhighway using an applicator, which may be a commercially available scoring or marking apparatus to form a film on the roadway layer or superhighway. In general, the film will have a thickness of approximately 4 to 20 mm, depending on the reflectorizing filler that is incorporated. Detailed Description of the Invention The scratch compound of the invention can be formed by 100% solids. In this context the term "solids" is taken from the chemistry of paints, where "solids" include any component (either liquid or solid) that becomes the last solid coating obtained. That is, the term "solids" essentially excludes volatile solvents or carriers. The phrase "essentially volatile" includes a liquid whose boiling point or initial boiling point is less than 150 ° C at normal atmospheric pressure. Scratch compound may have properties to solidify more rapidly. In the prior art the phrase "rapid solidification" was used to describe a "time not pass" scratch compound of about 5 to 10 minutes at room temperature. See Patent No. 4,255,468 of the United States. As used herein, the purpose of the phrase "rapid solidification" is to describe a strip compound that achieves a "time not to pass" of at least four minutes at room temperature. "Time not to pass" is defined as the time necessary for the striped compound, once applied to the roadway layer or superhighway, to solidify sufficiently to withstand the passage of normal traffic of cars and trucks. . Preferably, the time during which passage is not allowed in the amount of time sufficient to eliminate the need to place signaling cones to avoid passage without significantly altering normal traffic patterns. Of even greater preference would be a non-step time of less than two minutes, more preferably of about 10 to 50 seconds, and more preferably of about 20 to 40 seconds at 75 ° F. It is desirable that the striping compound relatively has no "no pass" time. "Step-by-step" may be possible from an application and solidification point of view, but it is generally desirable to have an "open time" to moisten the roadway or superhighway layer and capture the glass spheres. If the solidification polymerization is too fast, the resulting scratch composite has too much cohesion and does not have sufficient adhesion to the roadway or superhighway layer. Although it would be desirable to decrease it until the no-pass time is eliminated, it should not be so short that it severely sacrifices the adhesion to the affirmed layer of a highway or superhighway. In most applications a non-step time of 20 to 30 seconds is sufficient for the adhesion to be adequate at room temperature (75 ° F). In layers of cold firing a longer non-step time would be desirable for the adhesion Sufficient to the affirmed layer of the road or superhighway. While having fast solidifying properties, the scratch compound of the present invention adheres well enough to the roadway layer or superhighway, so that it can be expected to have a long life and to resist descaling. or abrasion caused by traffic, including furrows by snow. Scratch compound can be applied to any type of road bonding layer. Preferably, the bond layer is made of asphalt or concrete on which, due to its porosity, the scratch compound of the present invention adheres very well. Although the scratch composition adheres well to the bonding layer of most roads and superhighways, its adhesion is very light to other less porous surfaces such as metals. This property helps to prevent the scratch compound from adhering to the applicator. In case this is desired, the scratch compound can be applied to the porous affirmed layer of the road with as much strength as desired to ensure that the compound has sufficient adhesion to the road. Part A System This invention contemplates the use of a component containing the isocyanate-reactive group (part A), capable of reacting with the component containing the isocyanate group contained in part B, in order to give rapid solidification to the scratched compound The component containing the isocyanate-reactive group preferably contains polyols or thiols. The polyol component is selected based on the desired properties of the final polyurethane composition, in which adhesion, amber resistance, strength and flexibility are included, and also based on the desired properties of part A, between which include viscosity and reactivity. In order to obtain these properties, the polyol component can be a mixture of polyols. Polyols that can be used to form non-yellowing or amber polyurethanes are generally described in US Patent Nos. 4,504,418 and 5,159,045, which are incorporated herein by reference. These polyols include the compounds and polymers which are diols, triols and tetraols. Compounds and polymers include, for example, glycols such as ethylene glycol, propylene glycol, β, β '- dihydroxyethyl ether (diethylene glycol), dipropylene glycol, 1,4-butethylene glycol, 1,3-butylene glycol, 1,6-hexamethylene glycol, neopentyl glycol, polyethylene glycol , polypropylene glycol, polypropylene polyethylene glycol and polybutylene glycol; alkane polyols such as glycerol, trimethylolpropane, hexanetriol, penteeritritol, xylitol and sorbitol; polyester polyols obtained by the addition of a single component polymerization or a mixture of alkylene oxide such as ethylene oxide, propylene oxide and 1,2-butylene oxide to a single compound or to a mixture of polyhydric alcohols such as glycerol and propylene glycol or polyfunctional compounds such as ethylene diamine and ethanolamine; epoxy resins of the novolak type, of the ß-methylepichloro type, of the cyclooxirane type, of the glycidyl ether type, of the glycidyl ester type, of the glycol ether type, of the unsaturated epoxy fatty acid type, of the ester type of epoxylated fatty acid, of the ester type of polybasic carboxylic acid, of the aminoglycid type, of the alogenated type and of the resorcinol type; and the monosaccharides or their derivatives selected from fructose, glucose, sucrose, lactose or 2-methylglucoside.

However, in most applications, polyols containing groups of esters are not preferred because they tend to hydrolyze in the presence of the alkalinity present in the road layer. The unsaturation also tends to hydrolyze in the presence of alkalinity. If desired, polyesters and polyacrylates or other unsaturated polymers can be used. Such polymers are well known in the art. Part A preferably contains a mixture of a secondary diether diol and a minor polyalkylene glycol component. The lower polyalkylene glycol includes the polymers of the glycols in which the glycols have from 2 to 10 carbon atoms. The secondary diol diol forms the basis for the scoring compound and is preferably a propylene glycol and bisphenol A diether, which is commercially available under the trademark DOW RESIN 565, product of Dow Chemical Co. The minor polyalkylene glycol is tripropylene glycol preference The secondary diether diol is preferably present in an amount ranging from 30 to 90% by weight, based on the total weight of the reactant of part A, and more preferably 50 to 80% by weight. With a greater amount of this component the compound for scratching becomes too soft. The alkylene glycol may be present in an amount ranging from 10 to 70% by weight, based on the total weight of the reagent of Part A, and more preferably 20 to 40% by weight. With a greater amount of this component, the scratch compound becomes too brittle. Part B system This invention contemplates the use of a component containing the isocyanate group (part B) capable of reacting with the component containing the group that reacts to the isocyanate contained in part A to obtain a fast solidifying scoring compound . The component containing the isocyanate group (part B) preferably contains polyisocyanates with sufficient viscosity to allow part B to be applied with the road marking device without the need for solvents. The polyisocyanates must be able to react with the polyols of Part A to form a polyurethane system that does not become significantly amber with time. In part B, aliphatic and cycloaliphatic polyisocyanates are preferably used, because they tend to produce polyurethanes with decreased ambering. In general, the aliphatic and cycloaliphatic polyisocyanates that can be used in this invention correspond to the formula Q (NCO) n wherein n is an integer from 2 to 4, and Q represents a radical of the aliphatic hydrocarbon containing from 2 to 100 atoms carbon, and from zero to 50 heteroatoms, or a cycloaliphatic hydrocarbon radical containing from 4 to 100 carbon atoms and from zero to 50 heteroatoms. Some examples of the aliphatic and cycloaliphatic polyisocyanates include ethylene diisocyanate, tetramethylene 1,4-diisocyanate, 1,6-hexamethylene diisocyanate, trimethylhexamethylene diisocyanate, 1,12-diisocyanate dodecane, cyclobutane-1,3-diisocyanate, cyclohexane. -1, 3- and -1,4-diisocyanate and a mixture of these isomers, and isocyanatomethyl-3,3,5-trimethyl-5-cyclohexane. Preferred aliphatic and cycloaliphatic polyisocyanates are hexamethylene diisocyanate, its isocyanurates and biuret, and isocyanatomethyl-3,3,5-trimethyl-5-cyclohexane isocyanatomethyl (isophorone diisocyanate). The polyisocyanate is preferably trimerized hexamethylene diisocyanate (HDI), a trifunctional isocyanurate. A trimerized hexamethylene diisocyanate commercially available under the trademark DESMODUR N-3300 from Miles, Inc. is available for sale. The use of the aliphatic or cycloaliphatic polyisocyanates as the only component containing the isocyanate group of part B can create a system whose viscosity is too high for its use to be convenient in commercial equipment for road scratching. According to this inventionit is possible to change part of the aliphatic or cycloaliphatic polyisocyanate to an aromatic polyisocyanate. The aromatic polyisocyanates can be useful because they tend to have a viscosity lowering effect when mixed with aliphatic or cycloaliphatic polyisocyanates, and because they tend to react rapidly. In addition aromatic polyisocyanates tend to provide a faster reaction time and a harder finish. Aliphatic isocyanates tend to produce a softer polyurethane but more stable to light. Unfortunately, most aromatic polyisocyanates are brown and tend to produce yellow or brown polyurethanes. However, by using an aromatic polyisocyanate which is colorless or has a very faint color, it is possible to produce a polyurethane which retains properties of good resistance to ambering. One skilled in the art will readily appreciate that the amount of aromatic polyisocyanate present should be sufficient to decrease the viscosity of part B, so that it can be applied with road marking equipment, but at a sufficient level that avoids significant yellowing or ambering of the resulting polyurethane. The aromatic polyisocyanate is preferably diphenylmethane diisocyanate (for example diphenylmethane-2,4'- and / or -4,4'-diisocyanate), because its color is very faint. This aromatic polyisocyanate component is useful in particular because when combined with trimerized hexamethylene diisocyanate a polyurethane resin can be produced which does not significantly amber. Diphenylmethane diisocyanate is commercially available under the trademark LUPRANATE MP-102, for sale by BASF Corporation. In the same way, other colorless or very faint colored aromatic polyisocyanates can be used. The aromatic polyisocyanates that may be colorless and, therefore, can be used in the present invention include 2,4- and 2,6-hexahydrotolylene diisocyanate, hexahydro-1, 3- and / or -4,4 '- diphenylmethane diisocyanate, 1,3- and 1,4-phenylene diisocyanate, 2,4- and 2,6-tolylene diisocyanate, and naphthalene-1,5-diisocyanate. The aliphatic polyisocyanate must be present in an amount of about 50 to 100%, by weight, based on the total weight of the polyisocyanates of part B. Preferably the aliphatic polyisocyanate is present in an amount of about 40 to 90% , by weight, and more preferably from 70 to 80% by weight. The aromatic polyisocyanate must be present in an amount of about 0 to 50%, by weight, based on the total weight of the polyisocyanates of part B. Preferably the aromatic polyisocyanate is present in an amount of about 5.0 to 50%, by weight, and more preferably from 10 to 20% by weight. Part a and / or part B may contain a catalyst or a mixture of catalysts capable of accelerating the rate of solidification of the system to form the polyurethane. It is desirable that the system with two parts for the formation of the polyurethane solidify in a sufficient time to consider it a polyurethane of rapid solidification. Any catalyst which is capable of accelerating the reaction rate between the isocyanates and the alcohols can be used in this invention. Preferably a catalyst capable of accelerating the reaction between the aliphatic and / or cycloaliphatic polyisocyanates and the polyols. In Squiller et al., "Catalysis in the Reactions Aliphatic Isocyanate-Alcohol," Modern Paintings and Coatings, June 1987, some examples of catalysts are described. Such catalysts include stannous octoate, dibutyltin dilaurate, manganese octoate, zirconium octoate, cobalt octoate, lead octoate, bismuth stannate, lead stannate, zirconium octoate, zinc octoate, dibutyltin bis-O-phenylphenate, dibutyltin S, S-dibutyldithiocarbonate, trifenilantimony dichloride, dibutyltin maleate, stannous oxalate, stannous stearate, barium nitrate, cadmium octoate, dibutyltin diacetate, dibutyltin dilauril mercaptide, DABCO catalyst, DBTLD and DABCO catalyst, bismuth stearate, lead stearate, dichloride dimethyltin, stannous naphthenate and mixtures thereof. In this attempt dibutyltin dilaurate is the most preferred catalyst because of its reliability to catalyze polyurethanes. The catalyst component is preferably incorporated in part A, since the polyols are relatively unreactive until they are mixed with the polyisocyanate. The catalyst may be incorporated in part B, but may tend to accelerate the reaction between the isocyanate groups and the water in the atmosphere or traces thereof. In general, the catalyst is incorporated in part A and / or in part B, in an amount sufficient to give the desired catalytic activity. A person skilled in the art will readily appreciate the amount of catalyst needed to obtain the catalytic activity. In general, the present amount of catalyst should be from 0.1 to 10%, by weight, based on the total weight of the reaction components. A high-pressure pump lubricant can also be incorporated in part A and / or part B. It is possible to use any known pump lubricant, including phosphates. The most preferred lubricant is tricresyl phosphate, which is sold by FLM Corp. under the trade name KRONITEX TCP. It is surprising that when this pump lubricant is incorporated into part B, it also acts as an agent against condensation, extending the hardening time in the container of part B. Although in theory its purpose is not that of bonding, it is think that the vapor pressure of this agent creates a gas barrier on the polyisocyanates of part B, slowing the access of moisture in the atmosphere. In fact it is possible to incorporate other agents that extend the hardening time in the container. In general, the lubricant must be present in an amount that fluctuates approximately from 0.1 to 5.0%, by weight, taking as a base the total weight of the polyisocyanates of part B. In part A and / or in part B Also incorporate an additive to dissipate heat. It is usually easier to incorporate it into part A since it is more stable. The additive to dissipate the heat can be any inert diluent. When used in part A, it can also provide compatibility between the polyol components. The agent for heat dissipation is preferably a chlorinated aliphatic hydrocarbon resin, such as CHLOROWAX 50 (chlorinated paraffinic plasticizer, with a chlorine content of 48% weight, molecular weight of 635), CHROLOWAX 60-70 (plasticizer chlorinated paraffinic, with chlorine content of 60% weight), and CHLOROWAX LV (paraffinic plasticizer, with chlorine content of 39% weight, molecular weight 545). In general, the heat dissipating additive should be present in an amount ranging from about 1.0 to 20.0%, by weight, based on the total weight of the reaction components of the scratch compound. For marking the traffic lines, especially for marking the superhighways), it is preferred that the scratch compounds of this invention contain or be combined with a reflective filler, such as glass or plastic spheres or bubbles. Reflective filler is used to increase retroreflectivity, especially at night. The reflectorizing additive is preferably glass spheres smooth, round and transparent, materially free of milky appearance, scratches on the film, pitting, and air bubbles. Preferably, no more than 30% of the spheres are oval or imperfect.

Currently it seems that the most effective application of the reflector fill is to treat it as a third element (part C), which can be added to the part A / part B system before or after it has been applied to the layer of the highway or superhighway. In general, the reflective filler is dropped into the applied scouring compound and the filler is incorporated into the composite. Likewise, it is desirable that the scratch compound has a sufficient open time to receive the reflecting filler. A less effective way of incorporating the reflectorized filler into the part A / part B system is to mix it with the part A / part B mixture before applying it to the firing layer of the road or superhighway. This last approach is less desirable when the reflector filling is formed by spheres or bubbles that are easily billed during the mixing step, or if the mixing process is more complicated because, for example, the application equipment is rubbed. . A person skilled in the art can easily determine the amount of reflective filler to be incorporated in the scratch compound, based on the degree of retroreflectivity desired and the type of reflective filler being used. In general, the reflector filler must be present in an amount ranging from 10 to 98%, by weight, of the total weight of the scratch compound. Preferably it is present in an amount ranging from 40 to 80%, by weight, of the total weight of the filling. If so desired, the two-part system for forming the polyurethane can contain other additional components known in the art. Such additional components include, for example, diluents, pigments, plasticizers, leveling agents, surfactants, fillers, additives and the like. An example of a pigment is titanium dioxide, which can be used as a bleach. Preparation of the Formula Preferably, part A and part B are combined before being applied to the road surface layer or superhighway. For example, parts A and B may be mixed in any commercial in-line static mixer or mixer recognized in the art. It is believed that Graco Inc. manufactures equipment that can process the scratch compound of this invention. The compound can be applied with any thickness that is desired to the affirmed layer of a highway or superhighway. The minimum thickness must be sufficient for there to be a correct adhesion to the road surface layer or superhighway and the visibility is sufficient. The maximum thickness is determined according to economic factors, taking into account the cost of the initial materials and the possible increase in solidification time with a thicker film. Preferably the thickness of the film is from 1 to 100 thousandths (0.025 to 2.5 mm), and more preferably from 5 to 25 thousandths, depending on the amount of reflector fill that has been incorporated. Most commercial applications require a film thickness of approximately 10 to 15 thousandths. Preferably the two part scratch compound has a short hardening time in the container at room temperature (75 ° F). Preferably the hardening time in the container is less than 4 minutes, and more preferably less than 1 minute. The hardening time in the container can be reduced by incorporating a higher percentage of aromatic polyisocyanate, using a different or larger amount of catalyst, heating, or using some combination of the foregoing. In fact, the reaction rate between the polyisocyanates and the polyols also depends on the particular components that are used in the reaction, in terms of the reactivity of the components, steric hindrance, etc. which a person skilled in the art will understand. Scratch compound can be applied at room temperature. Alternatively, one or both parts can be heated before using them, in order to obtain better flow properties and a faster solidification time. Preferably, before its application the two-part system for forming the polyurethane is heated to a temperature of 80 to 200 ° F. More preferably it is heated to a temperature of 100 to 150 ° F. Preferably the proportion of part A and part B is 1: 1 by volume, for example, between 0.97: 1 and 1.05: 1. A person skilled in the art will readily recognize that it is possible to alter the proportion of part A and part B, remaining within the scope of the invention. It is desirable to have a slight excess of the isocyanate groups. It is preferable to have an excess of the isocyanate groups of 1.05%, to ensure that all the hydroxyl groups of the part A react. In general, the excess of the isocyanate groups can react with the water.

The resulting solidified streak compound can be thermoset and have a D-limit hardness of at least 60, and more preferably at least 75. The maximum limit hardness-D must be 100, and preferably less than 90. If the composite for scratching it is too hard, it becomes brittle. If the level of hardness is lower, the scratch compound picks up the dirt too easily. In this way, the scratch compound has the advantage of being resistant to dirt and of retaining its flexibility. The scratch compound must have a tensile and compression force that allows it to absorb at least 10,000 psi. In addition, it must have a sufficient abrasion resistance that allows it to withstand at least 1,000 cycles of a wheel tabor CS 17 rubbing wear meter, and preferably at least 50,000 cycles. The invention will be described more fully in connection with the following specific examples, which are not intended to limit the scope of the invention. Example 1 The formula in the following Table 1 illustrates a two-part system for the formation of polyurethane, according to this invention. Part A and part B were mixed in a ratio of 1: 1 by volume.

The resulting mixture has a curing time in the vessel of about one minute at 75 ° F. Table 1 Part A Parts by Weight DOW RESIN 565 70.0 tripropylene glycol 30.0 titanium dioxide 29.0 CHLOROWAX LV 11.1 dibutyltin dilaurate 04.0 Part B Parts by Weight DESMODUR N-3300 114.0 LUPRANATE MP102 36.0 tricresyl phosphate 1.4 The materials identified above under the trademark have, according to the suppliers, the following chemical compositions: "DOW RESIN 565": propylene glycol and bisphenol A diether ( the hydroxyl groups being secondary, available from the Dow Chemical Company). Properties Value equivalent weight of the hydroxyl 175-185 viscosity (at 60 ° C) 800-1700 cps phenolic OH max. 0.02% color, Gardner max. 5.0 pounds / gallon (at 25 ° C) 9.2 density (180/4 ° C) 1069"CHLOROWAX LV": liquid chlorinated paraffin, with a molecular weight of 545.0 (available from Occidental Chemical Corporation). "DESMODUR N-3300": aliphatic polyisocyanate (available from Miles Inc. Coatings Division). "LUFRANATE MP102": diphenylmethane diisocyanate (available from BASF Corp. Copolymers Division). Example 2 Part A and part B described in Example 1 were applied to the road layer of a road, by spray application, at a ratio of 1: 1 by volume. The resulting film was white and solidified rapidly enough (i.e. approximately 30 seconds), so that the placement of signaling cones was not necessary. The solidified scouring compound adhered well to both asphalt and concrete surfaces, and should have a D-boundary hardness of greater than 75, and should not yellow significantly in the course of time. Example 3 The process of Example 1 was repeated and in the combined compound for scratching glass spheres were dropped before it was solidified, which were incorporated therein. This compound will be very reflective during the night. The scratch compound adhered well to both asphalt and concrete surfaces. Example 4 A scratch-off compound according to this invention can be prepared from the formula identified in Table 2, in which parts A and B can be mixed at a ratio of 1.0: 1.05 by volume. Table 2 Part A Parts by Weight DOW RESIN 565 90.0 tripropylene glycol 10.0 titanium dioxide 29.0 CHLOROWAX LV 11.1 dibutyltin dilaurate 04.0 Part B Parts by Weight DESMODUR N-3300 60.0 LUPRANATE MP102 40.0 tricresyl phosphate 1.4 Example 5 A scratch compound according to this invention can be prepared from the formula identified in Table 3, in which parts A and B can be mixed at a ratio of 0.97: 1 by volume. Table 3 Part A Parts by Weight DOW RESIN 565 30.0 tripropylene glycol 70.0 titanium dioxide 29.0 CHLOROWAX LV 11.1 dibutyltin dilaurate 04.0 Part B Parts by Weight DESMODUR N-3300 90.0 LUPRANATE MP102 10.0 tricresyl phosphate 1.4 For those skilled in the art it should be evident that several changes to this invention are possible without departing from the scope thereof, and that the invention is not limited to what is described in the specification, but only in the manner indicated in the appended claims.

Claims (17)

1. In the claims: 1. A compound for scratching to be used on the layer of a road or superhighway, which includes a two-part system for the formation of polyurethane with fast solidification properties. Said two-part system for the formation of polyurethane includes a first part with the components containing the group that reacts to the isocyanate and a second part with the components containing the group of isocyanates. said streak compound being able to solidify and provide a film without no-pass time on the stated layer of a highway or superhighway. The scratch compound according to claim 1, wherein said first part includes a polyol selected from a group consisting of diether polyols, alkylene glycols, polyalkylene glycols, and mixtures thereof. The scratch compound according to claim 1, wherein said second part includes an aliphatic polyisocyanate and an aromatic polyisocyanate. 4. The scoring compound according to claim 3, wherein said aliphatic polyisocyanate is trimerized hexamethylene diisocyanate. 5. The scratch compound according to claim 3, wherein said aromatic polyisocyanate is diphenylmethane diisocyanate. The scratch composite according to claim 2, wherein said polyol is a mixture of secondary diol diol and a polyalkylene glycol. The scratch compound according to claim 6, wherein said diether is a propylene glycol and bisphenol A diether. 8. The scratch compound according to claim 2, wherein said polyalkylene glycol is tripropylene glycol. The scratch compound according to claim 1, wherein said second part also includes a non-reactive high pressure pump lubricant, capable of extending the cure time in the container of the compound, compared to a second part which it does not contain said non-reactive high-pressure pump lubricant. 10. The scratch compound according to claim 1, wherein said first part further includes a catalyst and an additive for dissipating the heat. 11. The scratch compound according to claim 1, wherein said compound will solidify within four minutes after the combination of said first part with said second part, said solidification occurring to a sufficient degree to prevent the passage of normal traffic of the superhighway. 12. The scratch compound according to claim 11, wherein said compound will solidify within one minute after the combination of said first part with said second part. 13. The scratch compound according to claim 1, said first part includes: Parts by Weight DOW RESIN 565 70.0 tripropylene glycol 30.0 titanium dioxide 29.0 CHLOROWAX LV 11.1 dibutyltin dilaurate 04.0 said second part includes: Parts by Weight DESMODUR N-3300 114.0 LUPRANATE MP102 36.0 tricresyl phosphate 1.4 14. A method for scratching the road surface or superhighway, this method includes the steps: (a) combining a first part with the components that contain the group that reacts to the isocyanate and a second part part with the components containing the isocyanate group to form a compound by scratch reaction. (b) apply the compound by scratch reaction to the road surface of a road. (c) letting said compound by streaking reaction solidify and adhere to said road tie layer. 15. The method according to claim 14, wherein said combining step involves mixing. 16. The method according to claim 14, wherein said combining step involves sprinkling said first and second portions together. 17. The method according to claim 14, wherein said first part includes a polyol selected from the group consisting of secondary diether polyols, alkylene glycols, polyalkylene glycols and a mixture thereof. 19. The method according to claim 14, wherein said second part includes an aliphatic polyisocyanate and an aromatic polyisocyanate. 20. A scratched road, prepared according to the process of claim 14.