JP2014185199A - Asphalt mixture adhesion preventive agent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an asphalt mixture adhesion preventive agent easily sliding down an asphalt mixture on a back of a dump truck and the like even with a condition having small inclination angle, hardly staining a contact surface of the back, excellent in residual property of liquid on the back, and excellent in stability at ordinary temperature or low temperature after dilution with water.SOLUTION: There is provided an asphalt mixture adhesion preventive agent containing a compound (A) represented by the formula (1) and an anionic surfactant having a hydrocarbon group or an acyl group having 8 to 18 carbon atoms, and sulfonate or sulphate (B), and having each mass ratio of (A) and (B) of (A) 90 to 98 mass% and (B) 2 to 10 mass%. RO-(EO)(PO)-R(1), where Ris a hydrocarbon group having 1 to 4 carbon atoms, Ris a hydrogen atom or a hydrocarbon group having 1 to 4 carbon atoms, EO is an oxyethylene group, PO is an oxypropylene group, m is the average addition mole number of the oxyethylene group, n is the average addition mole number of the oxypropylene group, m+n is 2 to 25, and the content of EO to the total content of EO and PO is 40 to 100 mass%.

Description

  The present invention makes it easy to slide asphalt composites on a loading platform such as a dump truck even at a low inclination angle, the contact surface of the loading platform is difficult to get dirty, excellent liquid residue on the loading platform, and after dilution with water at room temperature or The present invention relates to an asphalt mixture adhesion preventive having excellent stability at low temperatures.

  In an asphalt composite manufacturing plant and a road pavement site that handles asphalt composite, it is important to prevent the asphalt composite from adhering to equipment and equipment so as not to reduce workability. Among them, a loading platform such as a dump truck (hereinafter also simply referred to as a “loading platform”) used for transporting asphalt composite material is likely to adhere asphalt composite material, and a large amount of adhesion causes a reduction in work efficiency. Furthermore, when asphalt mixture is dropped by tilting the loading platform at the pavement site, there are often obstacles such as electric wires and signboards at the pavement site in residential areas and urban areas, so there may not be enough space to tilt the loading platform sufficiently large. Therefore, it is important not only that the asphalt composite material hardly adheres to the loading platform, but also that the asphalt mixture slides down quickly from the loading platform even at a low inclination angle.

  Conventionally, these problems have been solved by spraying light oil and heavy oil on the carrier in advance before loading the asphalt mixture. However, if light oil or heavy oil is used, the sprayed oil may partially flow out of the cargo bed, preventing the adhesion prevention effect corresponding to the spray amount, and also causing environmental problems. Further, since these oils dissolve asphalt, there is also a problem that the contact surface of the loading platform becomes dirty with the dissolved asphalt. Therefore, an asphalt mixture adhesion preventive agent that has the same or better performance as light oil and heavy oil, hardly causes environmental problems, and hardly flows out to the outside is desired.

Therefore, in order to solve these problems, Patent Document 1 discloses an anti-adhesive agent for heated asphalt mixture formed by mixing sodium alkyl sulfate ester, sodium alkyl ether sulfate ester and coconut oil. Document 2 discloses that a water-soluble lubricating oil composition containing a nonionic surfactant of polyoxyethylene sorbite fatty acid esters and animal and vegetable oils and fats can be used as an asphalt mixture adhesion inhibitor.
However, the anti-adhesive agents of Patent Document 1 and Patent Document 2 are excellent in anti-adhesion properties immediately after dilution with water and slide down quickly even when the inclination angle is low, but oil-water separation occurs over time, and the inside of the water dilution liquid tank Concentration gradients are likely to occur in the upper and lower layers. For this reason, when a layer having a low concentration is sprayed, there is a problem that the adhesion preventing property is not excellent and it is difficult to slide down at a low inclination angle. Furthermore, the problem that the loading platform becomes dirty with dissolved asphalt has occurred as in the case of light oil and heavy oil.

Patent Document 3 and Patent Document 4 disclose an anti-adhesion agent containing a terpene compound and a nonionic surfactant or an anionic surfactant.
However, the adhesion preventing agents of Patent Document 3 and Patent Document 4 have a problem that the dirt on the loading platform is reduced, but the dirt still remains. In addition, when oil-water separation occurred and a low-concentration layer was sprayed, the asphalt mixture was hardly slid off at a low inclination angle, and a stable adhesion preventing effect was not obtained.

Further, Patent Document 5 discloses an anti-adhesive agent containing a polyoxyalkylene glycol derivative, and Patent Document 6 discloses an olefin / maleic acid copolymer, a surfactant such as alkylbetaine, and a water-soluble agent. An asphalt adhesion inhibitor composition comprising a polyhydric alcohol is disclosed.
However, the anti-adhesive agent of Patent Document 5 does not separate with time even after dilution with water, and provides a stable anti-adhesion effect, and although the fouling of the cargo bed is small, the composite material is difficult to slide down at a low inclination angle even immediately after dilution. There was a problem. Similarly, the anti-adhesive composition of Patent Document 6 is not separated with time even after dilution with water, and stable anti-adhesion properties are obtained. It was difficult to slide down.

Patent Document 7 discloses an asphalt mixture adhesion inhibitor using a water-soluble polysaccharide, a surfactant such as alkylbetaine, and a water-soluble polyhydric alcohol.
However, although the adhesion preventing agent of Patent Document 7 improves the remaining property of the liquid on the spraying surface, there is a problem that it is difficult for the composite material to slide down at a low inclination angle.

  Therefore, the asphalt mixture can be quickly slid down from the loading platform even at a low inclination angle, and it is water-soluble and difficult to separate over time, providing a stable anti-adhesion effect, making the loading platform difficult to soil, The present condition is that the asphalt compound adhesion prevention agent which reduces an outflow is not obtained.

Japanese Patent Laid-Open No. 10-121028 International Publication No. 2003/035809 JP 2006-182859 A JP 2009-144030 A Japanese Patent Laid-Open No. 8-127761 JP 2011-063787 A JP 2012-2111248 A

  The present invention solves the above-described conventional problems, and its purpose is to make it easy to slide down asphalt composites in a loading platform such as a dump truck even in a state where the inclination angle is low, and the contact surface of the loading platform is difficult to get dirty. It is intended to provide an asphalt mixture adhesion preventive agent that is excellent in the persistence of the liquid and has excellent stability at room temperature or low temperature even after dilution with water.

  As a result of intensive studies to solve the above problems, the present inventors have found that an asphalt mixture adhesion inhibitor containing a specific alkylene oxide derivative and a specific anionic surfactant has a low inclination angle. The asphalt mixture quickly slides down, the contact surface of the loading platform is hard to get dirty, the liquid persistence is excellent, and it is excellent in stability at room temperature or low temperature even after dilution with water, and the present invention has been completed. It was.

That is, this invention is an asphalt compound adhesion inhibitor shown below.
Contains compound (A) represented by formula (1) and an anionic surfactant (B) having a hydrocarbon group or acyl group having 8 to 18 carbon atoms and having a sulfonate or sulfate. And an asphalt mixture adhesion inhibitor in which the mass ratios of (A) and (B) are (A) 90 to 98 mass% and (B) 2 to 10 mass%.
R ¹ O— (EO) _m (PO) _n —R ² (1)
(R ¹ is a hydrocarbon group having 1 to 4 carbon atoms, R ² is a hydrogen atom or a hydrocarbon group having 1 to 4 carbon atoms, EO is an oxyethylene group, and PO is an oxypropylene group. m is the average addition mole number of oxyethylene groups, n is the average addition mole number of oxypropylene groups, and m + n is 2 to 25. The ratio of the EO content to the total content of EO and PO is 40. ˜100 mass%.)

  The asphalt mixture adhesion preventive agent of the present invention is easy to slide down the asphalt mixture in a loading platform such as a dump truck even at a low inclination angle, the contact surface of the loading platform is difficult to get dirty, and the liquid remaining on the loading platform is excellent, Even after dilution with water, it has the effect of being excellent in stability at room temperature or low temperature.

  Hereinafter, embodiments of the present invention will be described. The asphalt mixture adhesion inhibitor of the present invention contains a component (A) and a component (B). In addition, the sum total of each mass ratio of (A) component and (B) component is 100 mass%. First, the (A) component shown by Formula (1) is demonstrated.

[Component (A)]
The component (A) used in the present invention is a compound represented by the formula (1).

R ¹ O— (EO) _m (PO) _n —R ² (1)

In the compound represented by the formula (1), R ¹ is a hydrocarbon group having 1 to 4 carbon atoms, and R ² is a hydrogen atom or a hydrocarbon group having 1 to 4 carbon atoms. Specific examples of the hydrocarbon group having 1 to 4 carbon atoms are methyl, ethyl, n-propyl, isopropyl, allyl, n-butyl, sec-butyl, and tert-butyl. . R ¹ is preferably a methyl group, and R ² is preferably a hydrogen atom.

  EO is an oxyethylene group and PO is an oxypropylene group. m is an average addition mole number of an oxyethylene group, and n is an average addition mole number of an oxypropylene group. The sum (m + n) of both average added mole numbers is 2-25, Preferably it is 6-10. If m + n is less than 2, the inclination angle at which the asphalt mixture begins to slide (hereinafter also referred to as the sliding angle) may be increased, and the stability after dilution with water may be deteriorated. If m + n exceeds 25, the slip-out angle may increase.

  The ratio of the EO content to the total content of EO and PO is 40 to 100% by mass, preferably 100% by mass. If the ratio of the EO content is less than 40% by mass, the contact surface of the loading platform may become dirty, or the stability after dilution with water may be deteriorated. The arrangement order of EO and PO is not particularly limited, and EO and PO may be added in blocks or randomly, but are preferably added in random.

  The compound represented by the formula (1) can be produced by a known method, and can be obtained, for example, by addition polymerization of a predetermined amount of ethylene oxide and propylene oxide to a monohydric alcohol having 1 to 4 carbon atoms.

  In addition, at the stage of addition polymerization of ethylene oxide and propylene oxide to a monohydric alcohol, as described above, ethylene oxide and propylene oxide may be polymerized randomly or in a block form. Further, the average number of moles of oxyethylene group (EO) and oxypropylene group (PO) added, and the ratio of EO content to the total content of EO and PO adjust the amount of ethylene oxide and propylene oxide used. Depending on the situation, it can be set appropriately.

  The content rate of (A) component in the asphalt mixture adhesion inhibitor of this invention is 90-98 mass%, Preferably it is 93-95 mass%. If it is less than 90% by mass or exceeds 98% by mass, the sliding angle may be increased.

[(B) component]
The component (B) used in the present invention is an anionic surfactant having a hydrocarbon group or acyl group having 8 to 18 carbon atoms and having a sulfonate or sulfate. From the viewpoint of heat stability from the asphalt mixture, a sulfonate is preferable.
Specifically, the component (B) is an alkylsulfonate, alkylbenzenesulfonate, acyl isethionate, acylmethyl taurate, alkyl sulfate, or polyoxyethylene having an average addition mole number of 1 to 5. Examples include ethylene alkyl sulfates and polyoxyethylene acylamide ether sulfates. Of these, polyoxyethylene acylamide ether sulfate and acylmethyl taurate having an amide group are preferable from the viewpoint of sliding properties and remaining of the diluted solution, and acyl from the viewpoint of heat stability from the asphalt mixture. Methyl taurine salt is preferred.

The number of carbon atoms of the hydrocarbon group or acyl group in the anionic surfactant as the component (B) is 8 to 18, preferably 10 to 14. The hydrocarbon group and the acyl group may contain an acyl group derived from a mixed fatty acid.
Specific examples of the hydrocarbon group and acyl group include octyl group, 2-ethylhexyl group, isooctyl group, nonyl group, 3,5,5-trimethylhexyl group, decyl group, isodecyl group, undecyl group, dodecyl group, tridecyl group. Group, tetradecyl group, pentadecyl group, hexadecyl group, isohexadecyl group, heptadecyl group, octadecyl group, octadecenyl group, isooctadecyl group, coconut oil alkyl group, 2-ethylhexanoyl group, isooctanoyl group, nonanoyl group, 3, 5 , 5-trimethylhexanoyl group, decanoyl group, isodecanoyl group, undecanoyl group, dodecanoyl group, tridecanoyl group, tetradecanoyl group, pentadecanoyl group, hexadecanoyl group, isohexadecanoyl group, heptadecanoyl group, octadecanoyl group Group, octa Senoiru group, iso octadecanoyl group, and coconut oil acyl group, preferably a dodecyl group, a dodecanoyl group, a coconut oil alkyl group, coconut oil acyl group.

The counter ion forming the salt of component (B) is, for example, an alkali metal or an alkanolamine. Specifically, lithium, sodium, potassium and the like are used for alkali metals, and monoethanolamine, diethanolamine, triethanolamine and the like are used for alkanolamines. Triethanolamine is preferred from the standpoint of sliding properties and liquid persistence.
(B) The anionic surfactant of a component may be used individually by 1 type, and may be used in combination of 2 or more type.

  The content rate of (B) component in the asphalt mixture adhesion inhibitor of this invention is 2-10 mass%, Preferably it is 5-7 mass%. If the amount is less than 2% by mass, the slide-out angle may increase, the residual property of the liquid may decrease, or the contact surface of the loading platform may become dirty. If the amount exceeds 10% by mass, the slide-out inclination angle may increase. is there.

In the asphalt mixture adhesion preventive agent of the present invention, by containing the component (A) and the component (B) as active ingredients, it is possible to prevent the asphalt mixture from sliding down and soiling the contact surface with a small inclination angle. The reason why this can be done is not necessarily clear, but the present inventors speculate as follows.
That is, the asphalt mixture adhesion preventing agent in which the components (A) and (B) are mixed first coats the surface of the asphalt mixture as well as the surface of the dump bed, and the surface of the dump bed, etc. A liquid film is formed between asphalts. At that time, the component (B) quickly adsorbs to the surface of the asphalt mixture to anionize the surface and promote the coating of the component (A).
The asphalt mixture adhesion inhibitor of the present invention is presumed to retain a liquid film even at a high temperature of about 150 ° C. when handling the asphalt mixture, and to exhibit sliding properties with an appropriate viscosity. At that time, the asphalt mixture adhesion preventive agent of the present invention is different from mineral oil or oil and fat, etc., and the liquid film is ionized to have a high polarity to prevent elution of asphalt which is a low polarity oil component. Therefore, it is assumed that the contact surface of the cargo bed is difficult to get dirty. In addition, it is surmised that the asphalt mixture adhesion preventive agent of the present invention can quickly generate foam at the time of spraying and suppress fluidity, thereby improving the liquid survivability.

[Asphalt mixture adhesion inhibitor]
As described above, the asphalt mixture adhesion preventive agent of the present invention is presumed to have a decrease in fluidity due to the presence of a large amount of bubbles on the surface and to improve the remaining property of the liquid on the loading platform. Therefore, bubbles can be generated even in a normal spraying method, for example, spraying PET bottles, and the remaining of the liquid can be improved. It is preferable to do this.
The asphalt mixture adhesion preventive agent of the present invention may be used as a stock solution, but usually diluted with water. The dilution ratio is 3 to 100 times by mass, preferably 5 to 20 times by mass with water relative to the stock solution.

The asphalt mixture adhesion inhibitor of the present invention can be used for paving equipment such as a cargo bed, a finisher, a Macadam roller, and a tire roller in an asphalt mixture transport vehicle such as a dump truck. It can also be used for in-plant equipment such as hoppers and skip elevators in asphalt compound factories.
The asphalt mixture is a mixed material in which asphalt is used as a binder and aggregates (such as gravel, sand, and partially molten slag) and fillers are mixed, and is used for paving roads and the like.

  The asphalt mixture adhesion preventive agent of the present invention is within the range that does not impair the effects of the present invention, polyhydric alcohols such as glycerin, diethylene glycol, propylene glycol, dipropylene glycol, organic or inorganic salts, pH adjusters, bactericides, You may contain a chelating agent, a pigment | dye, a fragrance | flavor, etc.

  Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples. In the following examples, EO is an oxyethylene group, POE is polyoxyethylene, and POP is polyoxypropylene.

  An asphalt mixture adhesion inhibitor was prepared using the component (A), the component (B) and other components, and the following tests were performed. Table 1 shows the component (A) used in Examples and Comparative Examples. Table 2 shows the composition and results of the anti-adhesion agents of the examples, and Table 3 shows the composition and results of the anti-adhesion agents of the comparative examples. In all the tests, the anti-adhesive agents evaluated as “◯” and “」 ”were accepted.

(1) Asphalt mixture slip test and dirt test In a 200 ml beaker, 10 ml of each asphalt mixture adhesion inhibitor is weighed, diluted 10 times with 90 ml of water, and stirred at 25 ° C. for 10 minutes using a stirrer chip. did. Thereafter, 50 ml of the diluted solution was put into a 100 ml screw tube, and a spray nozzle was attached so that the suction nozzle reached the bottom of the screw tube.
After spraying 1g of anti-adhesive agent diluted 10 times on SS400 steel plate (size 80cm x 50cm), straight asphalt mixture (dense grain asphalt mixture, straight asphalt: 6 mass) heated to 150 ° C on the sprayed surface %, Straight asphalt penetration 60-80: JIS K 2207) 500 g was loaded and allowed to stand. When the temperature reached 80 ° C., the steel plate was tilted, and the tilt angle (slide angle) at which the asphalt mixture slipped was measured.
Moreover, the external appearance of the steel plate surface after asphalt compound sliding down was confirmed.
The diluted solution of the asphalt mixture adhesion inhibitor was tested using a solution immediately after dilution and a solution after standing at 25 ° C. for 1 week. The evaluation of adhesion prevention was performed according to the following evaluation criteria.

(Sliding evaluation criteria)
A: All fall below 40 °.
○: All fall at a temperature greater than 40 ° and less than 50 °.
Δ: All fall below 50 ° and 80 ° or less.
X: All fall at an angle greater than 80 °, or do not fall at an angle greater than 80 °.

(Fouling prevention evaluation criteria)
(Double-circle): A brown deposit is hardly seen on the steel plate surface.
○: Brown deposits are seen in spots or spots at portions where the asphalt mixture on the steel plate surface was in contact.
X: A brown-colored deposit is seen on the entire surface of the steel plate.

(2) Diluted liquid survivability evaluation test A solution obtained by diluting each asphalt mixture adhesion inhibitor 10 times with water was sprayed on a 20 cm x 15 cm SS400 steel material with a foam jet, and then the steel material was 45 °. The sample was tilted at an angle, and the residual amount of the diluted solution after 10 minutes was measured.
The residual rate (%) was determined by the following calculation formula, and judged from the residual rate as follows.
Residual rate (%) = {(application amount−remaining amount after 10 minutes) / application amount} × 100

(Survivability evaluation criteria)
A: The residual rate is 95% or more.
○: Remaining rate is less than 95% and 90% or more.
X: The residual rate is less than 90%.

(3) Appearance of Diluted Solution A solution obtained by diluting each asphalt mixture adhesion inhibitor with water was allowed to stand in a thermostatic bath at −5 ° C. and 25 ° C. for 1 week, and then the appearance was evaluated according to the following three-stage criteria.
○: Uniform and transparent, no separation is seen.
Δ: Partial separation is observed.
X: Separation is observed.

  The asphalt mixture adhesion inhibitor of Examples 1 to 13 according to the present invention has the compound (A) represented by the formula (1), a hydrocarbon group having 8 to 18 carbon atoms or an acyl group, and a sulfonic acid Since it contains an anionic surfactant (B) having a salt or sulfate, the asphalt mixture slides down even when the inclination angle is low, and the adhesion surface of the loading platform is difficult to get dirty. The effect was not changed, the liquid remaining on the carrier was excellent, and the water dilution was stable at room temperature or low temperature.

On the other hand, the anti-adhesive agent (Comparative Example 1) containing ethylene glycol monobutyl ether having an addition mole number of oxyethylene of 1 instead of the component (A) has a good liquid persistence but is stable in dilution with water. The slipperiness and antifouling properties were poor.
(A) Instead of the component, the anti-adhesion agent (Comparative Example 2) containing polyethylene glycol monomethyl ether having an addition mole number of oxyethylene of 45 has good antifouling property, liquid remaining property, and water dilution stability. However, the sliding property is not good.
The anti-adhesive agent (Comparative Example 3) containing polyethylene glycol having 5 moles of oxyethylene in place of the component (A) has good antifouling properties and liquid survivability, but is stable in water dilution. Sliding property is not good.
The adhesion inhibitor (Comparative Example 4) containing glycerin instead of the component (A) has good antifouling properties, liquid persistence, and water dilution stability, but does not have good sliding properties.

The anti-adhesive agent (Comparative Example 5) containing coconut oil fatty acid amidopropyldimethylaminobetaine in place of the component (B) has good antifouling properties, liquid survivability, and water dilution stability, but is slippery. Is not good.
(B) Instead of the component, the anti-adhesive agent containing sodium dodecanoyl phosphate (Comparative Example 6) has good antifouling properties, liquid persistence and water dilution stability, but good sliding properties Not.
In place of the component (B), the anti-adhesive agent (Comparative Example 7) containing dodecyltrimethylammonium chloride has good antifouling properties and water dilution stability, but has poor sliding properties and liquid residual properties. It was.

  Anti-adhesive agent containing soybean oil, palm oil and polyethylene glycol (30 mol) sorbite fatty acid tetraoctadecenate (Comparative Example 8), d-limonene and sorbitan monooctadecenate instead of component (A), ( B) Anti-adhesive agent containing sulfosuccinic acid di-2-ethylhexyl ester sodium salt as component (Comparative Example 9), (A) component triethylene glycol monobutyl ether, (B) d-limonene instead of component, The anti-adhesion agent (Comparative Example 10) containing 1-decene and octadecenoic acid diethanolamine salt has good sliding properties immediately after dilution, but separation occurred after standing for 1 week and good results were obtained. It is not done. Moreover, the stain resistance of the steel sheet immediately after dilution, the liquid persistence, and the stability after dilution with water were poor. In addition, it is guessed that the stain | pollution | contamination prevention property of the steel plate after leaving still for one week is "(circle)" because the liquid isolate | separated and the layer with low density | concentration was sprayed.

(A) Component POP (10) POE (9) Monobutyl ether (EO 41 mass%), (B) Anti-adhesive agent not containing component (Comparative Example 11), (A) Instead of component POE ( 7) The anti-adhesive agent (Comparative Example 12) containing POP (17) POE (7) block copolymer (EO 40% by mass) and not containing the component (B) has antifouling properties and water dilution stability. Although it was good, the sliding property was not good, and the remaining property of the liquid was poor.
(A) Anti-adhesion agent (Comparative Example 13) containing glycerin instead of component, coconut oil fatty acid amide propyl dimethylamino betaine instead of component (B), and xanthan gum is antifouling property, liquid remaining The water dilution stability was good, but the sliding property was poor.

Claims (1)

Contains compound (A) represented by formula (1) and an anionic surfactant (B) having a hydrocarbon group or acyl group having 8 to 18 carbon atoms and having a sulfonate or sulfate. And an asphalt mixture adhesion inhibitor in which the mass ratios of (A) and (B) are (A) 90 to 98 mass% and (B) 2 to 10 mass%.
R ¹ O— (EO) _m (PO) _n —R ² (1)
(R ¹ is a hydrocarbon group having 1 to 4 carbon atoms, R ² is a hydrogen atom or a hydrocarbon group having 1 to 4 carbon atoms, EO is an oxyethylene group, and PO is an oxypropylene group. m is the average addition mole number of oxyethylene groups, n is the average addition mole number of oxypropylene groups, and m + n is 2 to 25. The ratio of the EO content to the total content of EO and PO is 40. ˜100 mass%.)