Saponification reaction type room temperature mixture containing soft vegetable oil

Abstract

To provide an all-weather type normal temperature mixture for road pavement and repair capable of achieving carbon neutrality and low carbon content for the all-weather type normal temperature asphalt mixture by using soft vegetable oil and fat (also referred to as "vegetable oil sludge pitch" or "vegetable crude oil distillation residue") which is a by-product derived from plants instead of asphalt used in the all-weather type normal temperature asphalt mixture.SOLUTION: An all-weather type normal temperature mixture contains: a soft vegetable oil and fat mixture containing soft vegetable oil and fat and vegetable oil fatty acid or further containing asphalt in addition to them, serving as a binder in an all-weather type normal temperature mixture for road pavement and repair, where the soft vegetable oil and fat contain at least 30 wt.% of γ-oryzanol in terms of component ratio; an aggregate; and an alkaline additive. The all-weather type normal temperature mixture may further contain a fiber material in addition to them.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a normal-temperature mixture that is generally used as a paving and repair material for maintenance work (also referred to as repair work) of asphalt paving. More specifically, it relates to a saponification reaction type normal-temperature mixture containing soft vegetable oil (also referred to as "vegetable oil pitch" or "vegetable crude oil distillation residue").

Background Art

[0002] Currently, normal-temperature asphalt mixtures are generally used as paving and repair materials for maintenance work (also referred to as repair work) of asphalt paving. The present inventors have also proposed an all-weather type normal-temperature asphalt mixture that is excellent in aggregate scattering resistance and has good workability and constructability. (See Patent Document 1 and Patent Document 2.) In recent years, toward the realization of a sustainable society, various industries have been conducting research and development on suppressing CO2 generation from production activities and developing products that do not depend on petroleum-derived materials. Also in the road industry, regarding the production and construction of asphalt paving materials, the decarbonization of materials and the suppression of CO2 generation during construction are desired by road users, and various technologies have been researched and developed. Since normal-temperature asphalt mixtures, which are one of the asphalt paving materials, are materials that have become widespread as paving and repair materials, the decarbonization of normal-temperature asphalt mixtures will help meet the demands of road users.

[0003] By the way, from the viewpoint of effective utilization of by-products, plant-derived raw materials or by-products have been used for a long time. That is, since it is well known that the aromatic components, which are the constituent components of asphalt in the asphalt composite used for road paving, deteriorate over time due to heating and mixing in plants, ultraviolet rays, wind, and rain after paving, technologies using plant-derived raw materials or by-products, such as various vegetable oil pitches, are known for the purpose of preventing the deterioration of this asphalt and improving the properties of asphalt more. For example, in order to improve the adhesion and viscoelasticity of paving asphalt, prevent the deterioration of asphalt, and obtain a paving material with high stability, a distillation residue of rice bran oil fatty acid or a distillation residue of soybean oil fatty acid and amine pitch (pitch remaining as a kettle residue when ammonia is allowed to act on fatty acids such as stearic acid, lauric acid, or oleic acid, followed by purification distillation to obtain fatty acid amines), and further sulfur is added and heated, and the reaction is stopped just before curing. Then, asphalt and filler are added thereto to obtain a road paving material. (See Patent Document 3.) Also, in order to improve properties such as the thermal instability and impact resistance of asphalt substances, oil sludge pitch of animal and vegetable oils (such as soybean oil sludge pitch, rapeseed oil sludge pitch, etc.) or fatty acid pitch (rapeseed oil fatty acid pitch), and fatty acids and polyhydric alcohols are added to the asphalt substance, and further a softening agent is added and mixed. Then, an oxide of an alkaline earth metal is added and mixed as a curing agent to cause curing. A method for producing an asphalt adhesive is known. (See Patent Document 4.) Furthermore, it is also known to regenerate deteriorated asphalt composite materials by adding a mixture of one or several kinds of a small amount of vegetable oil pitch (such as rice bran pitch, soybean pitch, etc.) to waste asphalt composite materials in which asphalt has deteriorated. (See Patent Document 5.) All of these prior arts merely effectively utilize plant-derived raw materials or by-products for the purpose of improving properties such as the deterioration and heat resistance of asphalt. Since a large amount of asphalt obtained from crude oil (fossil fuel) is used, it is obvious that they are not technologies for carbon reduction, and the problems are completely different.

[0004] As a technology for carbon reduction of asphalt paving materials that contributes to suppressing global warming, the bio-asphalt technology of using plant-derived raw materials or by-products as a part of the asphalt raw materials used for road paving has become well known. For example, the development of a bio-asphalt mixture manufacturing technology using kraft lignin, which is a by-product of the paper manufacturing process, is underway. This technology is highly expected as a technology that suppresses the consumption of fossil fuels and contributes to preventing global warming. (See Non-Patent Document 1.) In the future, the emergence and improvement of further plant-derived raw materials or by-products comparable to this kraft lignin are highly desired.

[0005] Also, as a paving binder used in a modified asphalt mixture for paving, a technique for providing a paving mixture excellent in workability by using a mixture of a polyamide resin and asphalt is known. (See Patent Document 6.) However, the polyamide resin used in the modified asphalt mixture is an additive newly chemically synthesized using a polymerized fatty acid obtained by a dehydration condensation reaction of dimer acid derived from vegetable oil and fat, and it is not the use of the by-product itself, so it can be said that the effect from the viewpoint of carbon reduction is low.

[0006] When compared with the technology of a bio-asphalt paving material mixture using kraft lignin, the soft vegetable oil used in the present invention (also referred to as "vegetable oil residue pitch" and "crude plant oil distillation residue") is significantly different from the kraft lignin described in Non-Patent Document 1 in that the amount used for asphalt is much larger, and the soft vegetable oil can be substituted for up to 100% of asphalt. That is, the inventors have first found that it is an "asphalt substitute", and have first been able to provide asphalt-free non-asphalt paving and repair materials. In addition, the soft vegetable oil used in the present invention is a brown, viscous oil discharged when producing vegetable oil fatty acids from crude plant oil, and is a plant-derived by-product. Therefore, different from the polyamide resin used in the paving binder described in Patent Document 6, since the plant-derived by-product itself can be used as a binder for paving and repair, it can suppress the consumption of fossil fuels.

Summary of the Invention

Problems to be Solved by the Invention

[0007] In view of the above problems, this invention was proposed as a result of intensive research on product development aimed at carbon neutrality and low carbonization. In particular, this invention uses soft vegetable oil (also referred to as "vegetable oil pitch" or "crude vegetable oil distillation residue") instead of straight asphalt used in normal temperature asphalt mixtures, thereby achieving low carbonization of normal temperature mixtures, that is, suppressing the consumption of asphalt obtained from crude oil (fossil fuel) and covering it with soft vegetable oil, which is a sustainable resource. The soft vegetable oil (also referred to as "vegetable oil pitch" or "crude vegetable oil distillation residue") used in this technology is a by-product generated during the refining process of crude vegetable oil (such as "rice crude oil" or "rice bran crude oil"). This technology also aims to provide a normal temperature mixture in which all or part of the straight asphalt can be replaced with soft vegetable oil.

Means for Solving the Problems

[0008] In order to achieve the above object, according to the present invention, a normal temperature mixture having the following characteristic points and constituent elements is provided. That is, as a means for solving the above problems, the present invention provides a normal temperature mixture for paving and repair that can replace all or part of straight asphalt, particularly in the so-called all-weather type normal temperature asphalt mixture (hereinafter simply referred to as "normal temperature asphalt mixture") that has been conventionally widely used. The outline and characteristics are as follows. (1) The first characteristic of the present invention is a soft vegetable oil mixture used as a binder for paving and repair containing soft vegetable oil and vegetable fatty acids, wherein the soft vegetable oil contains γ-oryzanol in a component ratio. , in a weight ratio of 70:30 to 50:50 This is a characteristic of the soft vegetable oil mixture. 40 to 50% by weight containing , and the vegetable oil fatty acid contains 10 to 67% by weight of oleic acid, 3 to 80% by weight of linoleic acid, or 20 to 80% by weight of linolenic acid in terms of component ratio (2) The second characteristic of the present invention is wherein the weight ratio of asphalt to the soft vegetable oil is in the range of 0:100 to 99:1 the soft vegetable oil mixture according to (1) above, characterized by containing asphalt.

[0009] ​ (3) The third feature of the present invention lies in a normal-temperature mixture characterized by containing the soft vegetable oil mixture described in (1) or (2), aggregates, and an alkaline additive. (4) The fourth feature of the present invention lies in a normal-temperature mixture characterized by containing the soft vegetable oil mixture described in (1) or (2), aggregates, an alkaline additive, and a fiber material. (5) The fifth feature of the present invention is A In the production method of the normal-temperature mixture described in (3) above, by pre-manufacturing and storing a binder mixture obtained by mixing asphalt, the soft vegetable oil, and the vegetable oil fatty acid, it is possible to perform production and construction at a temperature of 100°C or lower.

[0010] (6) The sixth feature of the present invention is A In the production method of the normal-temperature mixture described in (4) above, by pre-manufacturing and storing a binder mixture obtained by mixing asphalt, the soft vegetable oil, and the vegetable oil fatty acid, it is possible to perform production and construction at a temperature of 100°C or lower. (7) The seventh feature of the present invention lies in a paving method characterized by spraying water as a reaction accelerator onto the normal-temperature mixture described in (3) above, thereby solidifying the soft vegetable oil mixture and the alkaline additive through a saponification reaction or a neutralization reaction to develop strength.

[0011] (8) The eighth feature of the present invention is record( By spraying water as a reaction accelerator onto the normal-temperature mixture described in (4) above, the soft vegetable oil mixture and the alkaline additive are solidified through a saponification reaction or a neutralization reaction to develop strength, which is a characteristic of the paving method.

Advantages of the Invention

[0012] By adopting the configuration of the invention described above, the present invention exhibits the following effects.

[0013] In the present invention, using a soft vegetable oil mixture containing soft vegetable oil and vegetable oil fatty acid as a binder for paving and repair means biomassifying a part of the room-temperature mixture for paving and repair. Therefore, sustainable resources are used, contributing to the suppression of global warming. Further, when a room-temperature mixture obtained by mixing an aggregate and an alkaline additive is used with a soft vegetable oil mixture containing soft vegetable oil and vegetable oil fatty acid as a binder for paving and repair, and a reaction accelerator is supplied during construction, the alkaline additive in the mixture ionizes, and high strength is quickly developed by a saponification reaction or a neutralization reaction with the soft vegetable oil and / or the vegetable oil fatty acid, and flexibility can be imparted. Further, according to the present invention, by further containing asphalt and / or a fiber material, higher aggregate scattering resistance can be added to the room-temperature mixture.

[0014] Furthermore, the present invention provides a room-temperature mixture for paving and repair in which the weight ratio of asphalt to soft vegetable oil is in the range of 0:100 to 99:1. That is, the amount of soft vegetable oil used is large relative to the amount of asphalt used, and in particular, it is possible to replace the entire amount of straight asphalt with soft vegetable oil (also referred to as "vegetable oil pitch" or "vegetable crude oil distillation residue"). That is, the present inventors have first discovered that soft vegetable oil is an "asphalt substitute", and have been able to provide, for the first time, an asphalt-free non-asphalt paving and repair material, which greatly contributes to the reduction of the use of fossil fuels. By using a soft vegetable oil mixture containing soft vegetable oil and vegetable oil fatty acid as a binder for paving and repair, the amount of asphalt used in the room-temperature mixture for paving and repair can be drastically reduced or even zero compared to the conventionally widely used room-temperature asphalt mixture. Therefore, it is a revolutionary new material called an asphalt-free non-asphalt room-temperature application type mixture, and its performance as a new material is not inferior to that of existing materials.

[0015] Furthermore, in the present invention, by using fiber materials, flexibility can be added to the normal temperature mixture for paving and repair. Therefore, the reduction in the lifespan of the paved road caused by damages such as flow, undulation, cracks / breaks / defects of the paved road is improved, not only significantly improving the lifespan of the paved road, but also having extremely excellent resistance to aggregate scattering. Thus, it has excellent effects not only in terms of the significance in road construction, but also in road safety, maintenance management, and environmental protection.

[0016] And, although the present invention uses plant-derived residues, the procurement, mixing, and handling at the construction site of the raw materials constituting the normal temperature mixture are as easy as those of the conventional normal temperature asphalt mixture, and it is very significant because it suppresses the generation of carbon dioxide associated with asphalt production and consumption.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Mode for Carrying Out the Invention

[0018] The saponification reaction type room-temperature mixture (hereinafter also simply referred to as "room-temperature mixture") containing the soft vegetable oil fat of the present invention (also referred to as "vegetable oil residue pitch" and "crude vegetable oil distillation residue") can be applied at room temperature, and moreover, its application has all-weather functions and characteristics. The main part constituting the saponification reaction type room-temperature mixture consists of a soft vegetable oil fat mixture (which can also be conventionally referred to as a "composition") obtained by mixing soft vegetable oil fat and vegetable oil fatty acid. This soft vegetable oil fat mixture has functions and performance as a binder for paving and repair, and it plays the role and function as a binder. This saponification reaction type room-temperature mixture is essentially composed of a soft vegetable oil fat mixture in which the weight ratio of soft vegetable oil fat to vegetable oil fatty acid is in the range of 1:99 to 99:1.

[0019] The saponification reaction type room-temperature mixture of the present invention is composed of a soft vegetable oil fat mixture in which the weight ratio of soft vegetable oil fat to vegetable oil fatty acid is in the range of 1:99 to 99:1, preferably 80:20 to 40:60, and most preferably 70:30 to 50:50. If the weight ratio of soft vegetable oil fat to vegetable oil fatty acid is sequentially 40:60, 30:70, and 20:80, increasing the addition amount of vegetable oil fatty acid will reduce the viscosity of the soft vegetable oil fat mixture, making it easier to handle at room temperature. However, since the content of soft vegetable oil fat decreases, when used as a binder for the saponification reaction type room-temperature mixture, the flexibility and resistance to aggregate scattering tend to decrease. On the other hand, if the weight ratio of soft vegetable oil fat to vegetable oil fatty acid is sequentially 80:20, 90:10, and 99:1, decreasing the addition amount of vegetable oil fatty acid will increase the viscosity of the soft vegetable oil fat mixture, showing a tendency to become semi-solid. Therefore, it is not suitable as a binder for the saponification reaction type room-temperature mixture assuming application at room temperature. In the end, it was discovered that the specifications consisting of the components specified in this invention are suitable for the binder, and that by using them in combination with materials such as aggregate, asphalt, fibrous materials, and alkaline additives, it is significant in expressing special functions and properties such as early hardening and aggregate scattering resistance.

[0020] The viscosity of cutback asphalt used in room temperature asphalt mixtures is considered to be one index for evaluating the workability of room temperature asphalt mixtures. If the viscosity of cutback asphalt is low, the room temperature asphalt mixture will be easier to work with and can be judged to be easier to handle at room temperature.

[0021] As can be seen from FIG. 2, which shows the results of viscosity measurement performed by changing the mixing ratio of soft vegetable oil (rice bran fatty acid pitch unless otherwise specified) and vegetable oil fatty acid (linseed oil fatty acid unless otherwise specified) contained in the binder used in the room temperature mixture of the present application, if the weight ratio of the soft vegetable oil is high, the viscosity increases, the mixture becomes semi-solid, and it becomes difficult to handle at room temperature. On the other hand, if the weight ratio of the soft vegetable oil is reduced, the viscosity decreases and it becomes easy to handle, but since the content of the soft vegetable oil is reduced, there is a concern that the aggregate scattering resistance may decrease when used as a binder in the room temperature mixture of the present application. In other words, it can be said that the weight ratio of the soft vegetable oil and the vegetable oil fatty acid that is easy to handle at room temperature and can be used as a binder in the room temperature mixture of the present application is most preferably 70:30 to 50:50.

[0022] In addition, from the results of FIG. 2, the viscosity of the soft vegetable oil mixture (binder) used in the saponification reaction type room temperature mixture of the present invention was about the same as the viscosity of the cutback asphalt made by mixing vegetable oil fatty acid with the straight asphalt that has been conventionally used. Soap It was found that the chemically modified cold mix has workability comparable to that of existing cold asphalt mixes and can be handled in the same way as conventional mixes.

[0023] Also, as is clear from Table 1 and FIG. 3 showing Table 1 in graph form, it is also possible to use a mixture of straight asphalt and soft vegetable oil. That is, a binder obtained by mixing a mixture containing a straight asphalt and a soft vegetable oil in a weight ratio of 0:100 to 99:1 and vegetable oil fatty acids is used in the Soap chemical reaction type normal temperature mixture of the present invention. As a result of sequentially changing the weight ratio of straight asphalt and soft vegetable oil and measuring the viscosity of the binder mixed with vegetable oil fatty acids, when the weight ratio of straight asphalt and soft vegetable oil is 60:40 to 30:70, compared with the case of using only straight asphalt or soft vegetable oil, a low-viscosity binder could be obtained. That is, it has been found that by using straight asphalt and soft vegetable oil in combination, a normal temperature mixture having workability superior to that of existing normal temperature asphalt mixtures can be obtained.

[0024]

Table 1

[0025] Table 1 shows the results of changing the mixing ratio of straight asphalt and soft vegetable oil contained in the binder used in the normal temperature mixture of the present invention and measuring the viscosity. As the straight asphalt, those having a penetration of more than 60 and less than or equal to 80 (StAs60 / 80) and more than 150 and less than or equal to 200 (StAs150 / 200), which are generally commercially available grades, were selected. Also, the vegetable oil fatty acid (linseed oil fatty acid) used as a cutback material was mixed at 40% by weight based on the total amount of the binder as a standard mixing ratio of the binder used in the normal temperature mixture of the present invention.

[0026] Looking at FIG. 3 showing the viscosity measurement results of Table 1 in graph form, since the viscosity (at 25°C) of the binder using only soft vegetable oil and vegetable oil fatty acids is almost the same as the viscosity of the binder using only StAs60 / 80 and vegetable oil fatty acids, it is clear that the workability comparable to that when using asphalt is present in the normal temperature mixture of the present application by using soft vegetable oil instead of StAs60 / 80. Also, when the proportion of soft vegetable oil to asphalt in the binder was 50% by weight, the viscosity was minimized. From this result, when mixing asphalt and soft vegetable oil, the inventors found that until the proportion of soft vegetable oil to asphalt in the binder reaches 50% by weight, the viscosity decreases, indicating that the soft vegetable oil acts as a cutback material for asphalt.

[0027] That is, the present invention is essentially composed of a saponification reaction type normal temperature mixture obtained by mixing soft vegetable oil, vegetable oil fatty acid (also referred to as "plant fatty acid"), aggregate, and alkaline additive. The saponification reaction type normal temperature mixture of the present invention can also be made into a fiber-containing saponification reaction type normal temperature asphalt mixture by further containing asphalt and / or fiber material, which is preferable. When constructing this saponification reaction type normal temperature mixture, a reaction accelerator, such as water, is supplied, and the soft vegetable oil and / or vegetable oil fatty acid and the alkaline additive are caused to undergo a saponification reaction or a neutralization reaction to solidify, based on this principle.

[0028] The soft vegetable oil used in the present invention (also referred to as "vegetable oil pitch", "vegetable oil residue pitch", "crude vegetable oil distillation residue") is characterized by containing 30% by weight or more of γ-oryzanol. γ-oryzanol may be natural or synthetic. For example, rice bran fatty acid pitch, which is a plant-derived resource, is a residue generated when refining rice oil or distilled fatty acid from rice bran. Depending on the refining process of rice oil, since it contains 40 to 50% by weight of γ-oryzanol as the composition ratio of rice bran fatty acid pitch, it can be used alone as it is. However, it is not limited to this. One or more of rapeseed oil, soybean oil, linseed oil, tall oil, coconut oil, etc., which are other plant resources, or their pitches and fatty acid pitches produced from these oils are appropriately mixed with rice bran fatty acid pitch so that the ratio of γ-oryzanol in the overall composition of the mixture contains 30% by weight or more. Even if it is manufactured by adjustment, it belongs to the category of soft vegetable oil in the present invention and is clearly usable. Furthermore, even if it does not use, that is, does not contain rice bran fatty acid pitch, and is manufactured by adding and mixing natural or synthetic γ-oryzanol so that it contains 30% by weight or more in one or more appropriately mixed rapeseed oil, soybean oil, linseed oil, tall oil, coconut oil, etc., which are other plant resources, or their pitches, it belongs to the category of soft vegetable oil in the present invention and there is no problem in use. Needless to say. In addition, the soft vegetable oil used in the present invention does not exclude using it by containing pitches such as lard and beef tallow, which are some animal resources, and fatty acid pitches produced from these oils, while being based on soft vegetable oil, which is a plant resource.

[0029] As the vegetable oil fatty acid (also referred to as "plant fatty acid") used in the present invention, any one containing 10 to 67% by weight of oleic acid, 3 to 80% by weight of linoleic acid, and 20 to 80% by weight of linolenic acid in the component ratio of the vegetable oil fatty acid can be preferably used. As its usage mode, a specific vegetable oil fatty acid alone or a mixture composed of two or more of these can be preferably used. The vegetable oil fatty acid composition (weight %) is shown in Table 2 below by referring to Non-Patent Document 2 and Non-Patent Document 3 below.

[0030]

Table 2

[0031] As is clear from the above vegetable oil fatty acid composition (weight %), regarding the vegetable oil fatty acid used in the present invention of the present application, in particular, linseed oil fatty acid with a linolenic acid content in the fatty acid of approximately 30 to 60% by weight and soybean oil fatty acid with a linoleic acid content of approximately 50 to 57% by weight can be used alone. The vegetable oil used for the vegetable oil fatty acid is not limited to those used alone such as linseed oil fatty acid or soybean oil fatty acid, and vegetable oil fatty acids other than linseed oil fatty acid (for example, tall oil fatty acid and its esters, and other oils and fats or fatty acids, specifically cottonseed oil fatty acid, rice (bran) oil fatty acid, rapeseed oil fatty acid, sunflower oil fatty acid, and their esters, etc.) can be appropriately mixed so that the linolenic acid content in the total fatty acid amount of the mixture is 20 to 80% by weight, the linoleic acid content is 3 to 80% by weight, and the oleic acid content is 10 to 67% by weight. Needless to say, it is preferably used in the present invention.

[0032] In the present invention Soap The vegetable oil fatty acid used in the chemical type normal temperature mixture may be one refined from used oil such as waste cooking oil (also referred to as "No. 2 oil").

[0033] Table 3 shows the results of measuring the viscosities of soft vegetable oil mixtures obtained by mixing soft vegetable oils with vegetable oil fatty acids used in the present invention. The 2nd oil recycled fatty acid contains 10 to 67% by weight of oleic acid, the soybean oil fatty acid contains 3 to 80% by weight of linoleic acid, and the linseed oil fatty acid contains 20 to 80% by weight of linolenic acid, each used as a vegetable oil fatty acid.

[0034]

Table 3

[0035] From the results in Table 3, the viscosities of the soft vegetable oil mixtures of the present invention using vegetable oil fatty acids with different main components are values that are about the same as those of a conventional binder obtained by mixing straight asphalt and linseed oil fatty acid, and it can be said that workability similar to that of existing normal-temperature asphalt mixtures can be obtained. That is, it can be said that vegetable oil fatty acids containing 60 to 67% by weight of oleic acid, 50 to 57% by weight of linoleic acid, or 30 to 60% by weight of linolenic acid can be preferably used in the composition ratios of the vegetable oil fatty acids used in the present invention.

[0036] Next, the aggregates, alkaline additives, asphalt, fiber materials, etc. that form the saponification reaction type normal-temperature mixture of the present invention will be sequentially described. Cement and fiber materials serve to solve the problems of materials that may occur when using a soft vegetable oil (also referred to as "vegetable oil pitch" or "crude vegetable oil distillation residue") mixture. Aggregates include various aggregates that are commonly used as normal aggregates, including recycled ones such as sand, gravel, slag, stone powder, single-sized crushed stone conforming to JIS standards (JIS K 5001, JIS K 2008), size-adjusted crushed stone, crusher run, and crushed particles of concrete, and can be used alone or in combination. At the stage of adding and mixing aggregates into the soft vegetable oil mixture, due to the saponification reaction, it is preferable to handle them as dry aggregates containing little water. The addition amount of aggregates can be arbitrarily determined at the discretion of the site according to the properties required for the paving, for example, in the case of paving. Usually, the weight ratio of the soft vegetable oil mixture to the aggregates may be in the range of 1:99 to 10:90, preferably 3:97 to 9:91, and most preferably about 6:94 to 8:92. The material and shape of the aggregates are arbitrary, and the particle size can be arbitrarily selected with a maximum diameter of 0.01 to 50 mm. For reference, the particle size range in the standard specifications of the aggregates used in the mixture of the present invention is shown in Table 4 below.

[0037]

Table 4

[0038] As can be seen from the [Examples of Standard Specifications of Aggregates] in Table 4, the aggregates have slightly different states depending on the material, type, and acquisition route of the material, etc., but those having the above-mentioned aggregate particle sizes are desirable. From the perspective of the versatility of the saponification reaction type normal temperature mixture, the maximum particle size of the aggregates is preferably 3 to 20 mm. When used as a repair material, it is preferably 3 to 5 mm, and when used as a paving material, it is preferably 5 to 20 mm. Also, from the perspective of the workability of the saponification reaction type normal temperature mixture, the mass percentage of the aggregates passing through a sieve size of 0.075 mm is preferably 0 to 10%. Of course, when the traffic is released early after the construction of the saponification reaction type normal temperature mixture, it is also important to have an aggregate particle size such that the saponification reaction type normal temperature mixture does not easily scatter or flow even before it is completely cured.

[0039] For the fiber material that forms the saponification reaction type normal temperature mixture of the present invention, those with good dispersibility in the mixture are desirable. Also, since the fiber material is a material that affects strength and flexibility, it plays an important role in compensating for the decrease in softening point, strength, and flexibility of the soft vegetable oil caused by the addition of vegetable oil fatty acids. Furthermore, the fiber material in the mixture connects adjacent aggregates together with the hardened soft vegetable oil mixture. Therefore, the flexibility of the mixture is improved, and when traffic load is applied, the occurrence of aggregate scattering is suppressed. Examples of the fiber material include various fiber materials such as organic fibers such as natural fibers like cellulose and synthetic resin fibers like vinylon, and inorganic fibers such as glass, carbon fibers, and mineral fibers. The form of the fiber material is preferably one with a fiber length of 0.1 to 10 mm and a fiber diameter of about 1.0 to 100 μm, more preferably in the range of a fiber length of 0.5 to 5.0 mm and a fiber diameter of 5.0 to 80 μm.

[0040] If the fiber length is so-called 0.1 mm or less, such as 0.08 mm, the function as a fiber will not be exhibited and the reinforcing effect cannot be expected. Also, if it is 10 mm or more, such as 12 mm or 18 mm, problems such as uneven distribution, agglomeration, and cutting will occur in the mixing and dispersibility in soft vegetable oil (furthermore, asphalt), and the manifestation of fiber reinforcement cannot be expected. Therefore, the range of fiber length of 0.1 to 10 mm is the best specification. If the fiber diameter is 1.0 μm, it is too thin to exhibit a predetermined strength for reinforcing the saponification reaction type normal temperature mixture. Also, if it becomes 90 or 100 μm, problems will occur in the mixing and dispersibility with soft vegetable oil (furthermore, asphalt). In any case, as the fiber material to be used in the saponification reaction type normal temperature mixture of the present invention, those with a fiber length of 0.5 to 5.0 mm and a fiber diameter of 5.0 to 80 μm are preferable.

[0041] When showing the standard specification of the saponification reaction type normal temperature mixture of the present invention, considering the cost and the mixability with soft vegetable oil and asphalt, there is a case where it is added at 0.3% by weight to the saponification reaction type normal temperature mixture, and its behavior is analyzed. As shown in FIGS. 1(b) and 1(c) (see the right figure of FIG. 1(c)), the fibrous material in the mixture binds adjacent aggregates together with the cured soft vegetable oil mixture (and additionally asphalt). Therefore, it can be seen that the flexibility of the mixture is improved and the occurrence of aggregate scattering is suppressed when traffic load is applied.

[0042] As for the asphalt constituting the saponification reaction type normal temperature mixture of the present invention, any asphalt that satisfies the JIS standard (JIS K 2207:2006) may be used, and it is not particularly limited. Considering the ease of acquisition and the performance as a normal temperature mixture, StAs60 / 80 or StAs150 / 200 is preferable. Also, within the range that does not impair the performance as a normal temperature mixture, other grades of asphalt may be used alone or may be used in mixture with StAs60 / 80 or StAs150 / 200. The addition amount of asphalt is desirably such that the weight ratio of asphalt to soft vegetable oil is in the range of 0:100 to 99:1.

[0043] As for the alkaline additive constituting the saponification reaction type normal temperature mixture of the present invention, any compound that becomes alkaline by the action of a curing accelerator (for example, water) may be used, and it is not particularly limited. It is desirable to exhibit a lower hydrogen ion concentration (i.e., a higher pH) in the action of the curing accelerator. Considering environmental aspects, it is preferable to use ordinary Portland cement, which is a general civil engineering material. Also, in the presence of water, the additives that exhibit alkalinity are lime, slaked lime, calcium hydroxide, magnesium hydroxide, etc. However, especially as a material for road paving, etc., cement is easily available, and its handling, etc. are well-known to the skilled workers at the site, and it is most recommended from the viewpoints of workability, safety, and environment. The addition amount of cement is 1.0 to 10% by weight based on the saponification reaction type normal temperature mixture.

[0044] This cement does not act directly on soft vegetable oils, but functions as an alkaline component during the saponification reaction or neutralization reaction with vegetable oil fatty acids, and is closely related to the added amount of vegetable oil fatty acids. Also, the strength of the saponification reaction type normal temperature mixture changes depending on the mixing ratio of vegetable oil fatty acids and cement.

[0045] In addition, depending on the type of alkaline additive, in some cases, it is a standard usage method to add it to the mixture in advance at the construction stage to the soft vegetable oil mixture, but it is also possible to spray water in a state where the alkaline additive is mixed with water onto the paved part after construction.

[0046] As described above, the saponification reaction type normal temperature mixture of the present invention comprises, as essential components, a soft vegetable oil mixture obtained by mixing a soft vegetable oil and a vegetable oil fatty acid such as linseed oil fatty acid, an aggregate, cement (and further, asphalt and / or a fiber material), and by supplying water thereto as a reaction accelerator, the saponification reaction or neutralization reaction proceeds and solidifies.

[0047] Incidentally, the soft vegetable oil mixture of the present invention may optionally contain 1.0 to 20% by weight of various natural or synthetic resins and rubbers such as polyamide resin, polyvinyl alcohol, ethylene-vinyl acetate copolymer, polyethylene, polyurethane, epoxy resin, polyester, waste plastic, recycled plastic, rubber, rosin, etc. within a range that does not particularly impair the workability of the saponification reaction type normal temperature mixture with respect to the soft vegetable oil. Addition By blending them, it is possible to prevent the formation of ruts on the paved road, prevent the scattering of aggregates, improve durability, prevent wear, and prevent vibration collapse.

[0048] The formulation of the mixture of the present invention prepared using soft vegetable oil (rice bran fatty acid pitch), vegetable oil fatty acid (linseed oil fatty acid unless otherwise specified), aggregate, cement, fiber material (and additionally asphalt) is shown in Table 5 below. As the binder, unless otherwise specified, a binder with a composition ratio of 60% by weight of soft vegetable oil and 40% by weight of linseed oil fatty acid was used. Also, the aggregate was adjusted to fall within the particle size range shown in Table 4, and the aggregate particle size of the standard specification shown in Table 6 was used. In the following description, the results of the demonstration experiment conducted under the above-described embodiment are shown.

[0049]

Table 5

[0050]

Table 6

[0051] Of the present invention Soap The amount of water added as a reaction accelerator for the saponification reaction type normal temperature mixture of the present invention varies depending on the cement content in the normal temperature mixture. Figure 4 shows the results of measuring the Marshall stability test while changing the amount of water added in the case of the standard formulation shown in Table 5. The stability obtained from the Marshall stability test is an index for evaluating the strength of the normal temperature mixture, and it can be evaluated that the higher the value, the higher the strength. If water is 100% by weight or more with respect to cement (about 4% with respect to the total weight of the normal temperature mixture), sufficient strength with a stability of about 13 kN or more can be obtained, and after 300% by weight, the stability value becomes constant. That is, in order for the saponification reaction type normal temperature mixture of the present invention to exhibit strength early, the amount of water added is Soap Preferably 100 to 500% by weight (about 4 to 20% by weight of the total weight of the normal temperature mixture) with respect to the total cement content of the saponification reaction type normal temperature mixture. Of course, even when the amount of water added is small, the saponification reaction or neutralization reaction proceeds over time, and the strength increases.

[0052] Table 7 shows the results of the ambient temperature cantabro test when the γ-oryzanol content in the soft vegetable oil used in the present invention is different. The loss rate obtained from the ambient temperature cantabro test is a value indicating the resistance of the aggregate to scattering in the ambient temperature mixture, and it can be evaluated that the lower the value, the better the resistance of the aggregate to scattering. Good resistance of the aggregate to scattering means that when the ambient temperature mixture is used as a road repair material, the ambient temperature mixture will stay at the repair location for a long time, indicating that the ambient temperature mixture of the present invention is an optimal material as a road repair material. The binder used in the test was of the formulation shown in Table 7. Also, the ambient temperature mixture was prepared with the formulation shown in Table 5.

[0053]

Table 7

[0054] From the results in Table 7, when rice bran oil pitch with a γ-oryzanol content of less than 10% by weight was used, the aggregate loss rate deviated significantly from the company's target value at 67%. On the other hand, in the case of rice bran fatty acid pitch with a γ-oryzanol content of 45% by weight, the aggregate loss rate was 8.0%, meeting the company's target value and being equivalent to the value when using straight asphalt. That is, when replacing 100% of straight asphalt with soft vegetable oil, it can be said that the γ-oryzanol content in the soft vegetable oil is preferably 40 - 50% by weight. Also, it was confirmed that by mixing rice bran oil pitch with straight asphalt at the ratio shown in Table 7, the aggregate loss rate approaches the company's target value.

[0055] An ambient temperature mixture was prepared using a soft vegetable oil mixture with a varying mixing ratio of the soft vegetable oil and vegetable oil fatty acid used in the present invention as a binder, and an ambient temperature cantabro test was carried out to evaluate the aggregate loss rate. The binder used in the test was of the formulation shown in Table 8. Also, the ambient temperature mixture was prepared with the formulation shown in Table 5. As shown in Table 8, when the weight ratio of vegetable oil fatty acid is large, the loss rate increases and deviates significantly from the target value. That is, it is easy to handle at ambient temperature, and the Soap The weight ratio of soft vegetable oil to vegetable oil fatty acid that can be used as a binder for the chemical reaction type normal temperature mixture is preferably 70:30 to 50:50, and most preferably 60:40.

[0056]

Table 8

[0057] The ratio of soft vegetable oil to asphalt in the binder used in the normal temperature mixture of the present invention was changed, and the results of the normal temperature Cantabro test are shown in Fig. 5. The binders used in the test were those with the mixing ratios shown in Table 1. Also, the normal temperature mixture was prepared with the mixing shown in Table 5.

[0058] From Fig. 5, since the loss rate using only soft vegetable oil and vegetable oil fatty acid is almost the same as the loss rate using only StAs60 / 80 or StAs150 / 200 and vegetable oil fatty acid, it was found that by using soft vegetable oil instead of asphalt, the present invention's normal temperature mixture has aggregate scattering resistance comparable to that when using asphalt. Also, by setting the ratio of soft vegetable oil to asphalt in the binder to 50% by weight, it was found that the viscosity of asphalt and the flexibility of soft vegetable oil are compatible, the loss rate decreases, that is, the aggregate scattering resistance is improved.

[0059] The ratio of soft vegetable oil to asphalt in the binder used in the normal temperature mixture of the present invention was changed, and the results of the bending test at -10°C are shown in Figs. 6(a) and (b). The binders used in the test were those with the mixing ratios shown in Table 1. Also, the normal temperature mixture was prepared with the mixing shown in Table 5. The bending test is mainly a test for evaluating the flexibility of the asphalt mixture. Materials with excellent flexibility are less likely to crack, so when used as paving and repair materials, they stay at the construction site for a long time, leading to a longer service life of the paving.

[0060] From FIGS. 6(a) and 6(b), it can be seen that the room-temperature mixture of the present invention using only soft vegetable oil and vegetable oil fatty acids has substantially the same bending strength as the case of using only StAs60 / 80 or StAs150 / 200 and vegetable oil fatty acids, and has a bending fracture strain about three times that of the latter. Therefore, by using soft vegetable oil instead of asphalt, it has strength comparable to that when using asphalt and excellent flexibility.

[0061] Table 9 shows the results of a wheel tracking test at 60°C by changing the ratio of soft vegetable oil to asphalt in the binder used in the room-temperature mixture of the present invention. The binders used in the test were those with the mixing ratios shown in Table 1. Also, the room-temperature mixture was prepared with the formulation shown in Table 5. The dynamic stability (DS) obtained from the wheel tracking test is mainly a test for evaluating the flow resistance of asphalt mixtures. A high DS value indicates good flow resistance, even in summer when the road surface temperature is high. When used as a paving and repair material, it will stay at the construction site even in summer, leading to a longer lifespan of the pavement.

[0062]

Table 9

[0063] From Table 9, it can be seen that the room-temperature mixture of the present invention using only soft vegetable oil and vegetable oil fatty acids has a lower DS value compared to the case of using only StAs60 / 80 and vegetable oil fatty acids. However, the DS of the dense-graded asphalt mixture (13) commonly used in road paving is in the range of 300 - 500 times / mm, which is approximately the same as that of the room-temperature mixture of the present invention. Therefore, the room-temperature mixture of the present invention using soft vegetable oil instead of asphalt has no problem in terms of performance as a paving and repair material.

[0064] Table 10 shows the results of the Cantabro test at room temperature when the main component ratio of the vegetable oil fatty acids used in the present invention is different. The binders used in the test were those with the mixing ratios shown in Table 3. Also, the room-temperature mixture was prepared with the formulation shown in Table 5.

[0065] [Table 10]

[0066] From the results in Table 10, it can be said that the room temperature mixture of the present invention using vegetable oil fatty acids with different main components satisfies the company's target values ​​and is comparable to existing room temperature asphalt mixtures, so it has sufficient performance as a pavement and repair material. In other words, it can be said that the component ratios of the vegetable oil fatty acids used in the present invention are more preferably 60 to 67% by weight of oleic acid, 50 to 57% by weight of linoleic acid, and 30 to 60% by weight of linolenic acid.

[0067] The results of bending tests at -10°C when the main component ratio of the vegetable oil fatty acid used in the present invention is different are shown in Figure 7. The binder used in the test had the blending ratio shown in Table 3. The room temperature mixture was prepared with the blending ratio shown in Table 5.

[0068] As shown in Fig. 7(a) and (b), the results of the present invention using vegetable oil fatty acids with different main component ratios are Soap The chemical reaction type room temperature mixture has almost the same bending strength and about three times the bending breaking strain compared to the existing room temperature asphalt mixture. Soap It can be said that chemical reaction type room temperature mixtures have the same strength as existing room temperature asphalt mixtures and also have excellent flexibility. [Industrial Applicability]

[0069] The normal-temperature mixture of the present invention can be sustained by using, as part of its materials, a by-product generated in the refining process of crude vegetable oil, namely soft vegetable oil (also referred to as "vegetable oil pitch" or "crude vegetable oil distillation residue"). Moreover, since it can replace asphalt used in conventionally widely used normal-temperature asphalt mixtures, the normal-temperature mixture of the present invention is significant in that it can suppress asphalt consumption and achieve carbon reduction. The soft vegetable oil (also referred to as "vegetable oil pitch" or "crude vegetable oil distillation residue") of the present invention, as an "asphalt substitute", can greatly contribute to the development of industrial fields dealing with asphalt and new application fields, for example, in road paving, paving of squares, facilities, etc., waterproofing work, repair work, etc., because construction can be achieved safely and easily.

Explanation of Signs

[0070] 1 Soft vegetable oil 2 Vegetable oil fatty acid 3 Asphalt 4 Alkaline additive (cement) 5 Fiber material 6 Aggregate 7 Water 8 Plate or tamper 9 Hardened soft vegetable oil mixture P Load

Prior Art Documents

Patent Documents

[0071]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Patent Document 5

Patent Document 6

Non-Patent Document

[0072]

Non-Patent Document 1

Non-Patent Document 2

Non-Patent Document 3

Claims

1. A soft vegetable oil mixture used as a binder for paving and repair, containing soft vegetable oil and vegetable oil fatty acids in a weight ratio of 70:30 to 50:50, wherein the soft vegetable oil contains 40 to 50 wt% of γ - oryzanol in terms of component ratio, and the vegetable oil fatty acid contains 10 to 67 wt% of oleic acid, 3 to 80 wt% of linoleic acid, or 20 to 80 wt% of linolenic acid in terms of component ratio. A soft vegetable oil mixture characterized by the above.

2. Further, the soft vegetable oil mixture according to claim 1, characterized in that the asphalt is contained in a weight ratio of the asphalt to the soft vegetable oil in the range of 0:100 to 99:

1.

3. A normal temperature mixture characterized by containing the soft vegetable oil mixture according to claim 1 or 2, aggregate, and an alkaline additive.

4. A normal temperature mixture characterized by containing the soft vegetable oil mixture according to claim 1 or 2, aggregate, an alkaline additive, and further a fiber material.

5. A method for producing a normal temperature mixture according to claim 3, characterized in that by pre - manufacturing and storing a binder mixture obtained by mixing asphalt, the soft vegetable oil, and the vegetable oil fatty acid, production and construction can be carried out at a temperature of 100°C or lower.

6. A method for producing a normal temperature mixture according to claim 4, characterized in that by pre - manufacturing and storing a binder mixture obtained by mixing asphalt, the soft vegetable oil, and the vegetable oil fatty acid, production and construction can be carried out at a temperature of 100°C or lower.

7. A paving method characterized in that by spraying water as a reaction accelerator on the normal temperature mixture according to claim 3, the soft vegetable oil mixture and the alkaline additive are solidified by saponification reaction or neutralization reaction to exhibit strength.

8. A paving method characterized in that water is sprayed as a reaction accelerator on the normal-temperature mixture according to claim 4, and the soft vegetable oil mixture and the alkaline additive are solidified by a saponification reaction or a neutralization reaction to develop strength.

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