JP2015052040A - Asphalt mixture antiadhesive agent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an asphalt mixture antiadhesive agent which is easy to make an asphalt mixture slide down even in a state when an inclination angle is low, exhibits a high effect of easily detaching the asphalt mixture even when adhesion of the asphalt mixture occurred, and a water diluted solution of which is stable even at room temperature to low temperature.SOLUTION: The asphalt mixture antiadhesive agent comprises a polyoxyalkylene monoalkyl ether (A) represented by formula (1), a polyoxyalkylene monoalkyl ether (B) represented by formula (2), and a hydrocarbon oil or a monoester oil (C) having a molecular weight of 100 to 600, wherein a mass ratio of (A) is 30 to 70 mass%, the mass ratio of (B) is 25 to 58 mass%, and the mass ratio of (C) is 5 to 12 mass%: RO-(EO)(PO)-H (1) (in the formula, Ris a hydrocarbon group having 1 to 4 carbon atoms; EO is an oxyethylene group; PO is an oxypropylene group; m is an average addition mole number of the oxyethylene group; n is an average addition mole number of the oxypropylene group; m+n is 4 to 20; and a ratio of EO content to a total of respective contents of EO and PO is 40 to 100 mass%); and RO-(EO)(PO)-H (2) (in the formula, Ris a branched hydrocarbon group having 8 to 18 carbon atoms; EO is an oxyethylene group; PO is an oxypropylene group; k is an average addition mole number of the oxyethylene group; l is an average addition mole number of the oxypropylene group; k+l is 5 to 25; and a ratio of EO content to a total of respective contents of EO and PO is 70 to 100 mass%).

Description

  The present invention is easy to slide down the asphalt mixture even in a state where the inclination angle is low, and even when the asphalt mixture adheres, the effect of peeling the asphalt mixture is high, and the water dilution liquid is stable even at room temperature or low temperature. The present invention relates to an asphalt mixture adhesion inhibitor.

Asphalt mixture used in road paving is composed of asphalt that is an adhesive and aggregate that is the foundation of the road. The asphalt composite material is mixed with the aggregate in a heated liquid state, and exhibits adhesiveness when cooled and solidified.
In an asphalt compound manufacturing factory or a road pavement site where asphalt compound is handled, it is important to prevent the asphalt compound from adhering to equipment and equipment so as not to reduce workability. In particular, hoppers, skip elevators, and belt conveyors in the asphalt mixture plant have a structure in which the asphalt mixture slides down the inclined surface, and if the asphalt mixture does not slide down, it adheres to the inclined surface and other asphalt Since the mixed material gradually accumulates on the adhering portion and causes clogging or the like, the working efficiency is greatly reduced. Similar problems may also occur in a dump truck bed for loading asphalt mixture. Therefore, in order to prevent the asphalt mixture from adhering and accumulating on these hoppers, skip elevators, belt conveyors, loading platforms, etc., it is necessary to spray or apply an asphalt mixture adhesion preventing agent having an adhesion preventing effect and a peeling effect.

  Conventionally, to remove asphalt mixture adhering to hoppers, skip elevators, belt conveyors, etc., mineral oil such as light oil and heavy oil is brought into contact with the hoppers, skip elevators, belt conveyors, etc. through tanks and pipelines. According to the timing of the automatic spraying was carried out regularly by automatic control.

  However, in the method of using mineral oil such as light oil and heavy oil, there is a concern that the sprayed light oil, heavy oil, and the like will flow out and adversely affect the surrounding environment. Therefore, many asphalt mixture anti-adhesive agents used by diluting with water have been reported as anti-adhesive agents that can be used as an alternative to these mineral oils such as light oil and heavy oil.

  Patent Document 1 reports an emulsion-type asphalt mixture adhesion inhibitor composition obtained by diluting and emulsifying animal and vegetable oils and fats and polyoxyethylene sorbite fatty acid esters with water. However, in this composition, in order to obtain a good effect, a lot of animal and vegetable oils and fats are blended, and oil / water separation occurs in the tank over time after dilution with water, resulting in a concentration gradient in the tank. In addition, there is a problem that the peeling effect cannot be obtained.

  In Patent Document 2, a terpene compound, a glycol, an alkylene oxide adduct of alcohol, an alkylene oxide adduct of amine, and an esterified product thereof, and a nonionic surfactant that is a polyhydric alcohol fatty acid ester, An emulsion-type asphalt mixture adhesion inhibitor using an anionic surfactant has been reported. However, even with this anti-adhesive agent, many terpene compounds are blended in order to obtain a good effect, and the stability after dilution with water is not sufficient, leading to obtaining a stable anti-adhesion effect and a peeling effect. Not.

  As a means for solving the problem of oil-water separation over time, a method of using a base material that does not contain an oil component and has high affinity for water has been proposed. For example, Patent Document 3 reports an adhesion preventing agent using a polyoxyalkylene glycol derivative. Although this anti-adhesive agent has good stability after dilution with water and a stable anti-adhesion effect is obtained, the peeling effect is not sufficient, and in particular, plant facilities such as hoppers and skip elevators to which asphalt composites easily adhere It was insufficient in terms of effect to be used in.

  Patent Document 4 reports an asphalt mixture adhesion inhibitor using two types of polyoxyalkylene dialkyl ethers and liquid paraffin. Although this anti-adhesive agent is excellent in anti-adhesion effect and peeling effect, a sufficient inclination angle is necessary for sliding down the asphalt mixture, and asphalt mixture may be deposited depending on the shape of the hopper, skip elevator, etc. There was room for improvement in terms of adhesion prevention effect.

  Therefore, at present, it is easy to slide down the asphalt mixture even when the inclination angle is low, and even if the asphalt mixture adheres, the effect of peeling the asphalt mixture is high, and the water dilution solution is stable even at room temperature or low temperature. An asphalt mixture adhesion inhibitor has not been obtained.

International Publication No. 2003/035809 JP 2006-182859 A Japanese Patent Laid-Open No. 8-127761 JP 2013-087164 A

  The present invention solves the above-described conventional problems, and the object thereof is to easily slide down the asphalt mixture even when the inclination angle is low, and to peel off the asphalt mixture even when the asphalt mixture adheres. It is an object to provide an asphalt mixture adhesion preventing agent that is highly effective and that is stable even when the water dilution is at room temperature or low temperature.

  As a result of diligent studies to solve the above problems, the present inventors have asphalt containing two types of polyoxyalkylene monoalkyl ethers, hydrocarbon oils or monoester oils having a predetermined molecular weight in specific ratios. The present inventors have found that a composite material adhesion preventing agent can solve the above problems, and have completed the present invention.

That is, the present invention relates to a polyoxyalkylene monoalkyl ether (A) represented by the formula (1), a polyoxyalkylene monoalkyl ether (B) represented by the formula (2), and a hydrocarbon oil having a molecular weight of 100 to 600. Or the monoester oil (C) is contained, the mass ratio of (A) is 30 to 70 mass%, the mass ratio of (B) is 25 to 58 mass%, and the mass ratio of (C) is 5 to 12 mass%. It is a certain asphalt mixture adhesion inhibitor.
R ¹ O— (EO) _m (PO) _n —H (1)
(In the formula, R ¹ is a hydrocarbon group having 1 to 4 carbon atoms. EO is an oxyethylene group, PO is an oxypropylene group, m is the average number of moles added of the oxyethylene group, and n is an oxypropylene group. (M + n is 4 to 20. The ratio of the content of EO to the total content of EO and PO is 40 to 100% by mass.)
R ² O— (EO) _k (PO) ₁ —H (2)
(Wherein R ² is a branched hydrocarbon group having 8 to 18 carbon atoms, EO is an oxyethylene group, PO is an oxypropylene group, k is the average number of moles of oxyethylene group added, l is (The average number of moles of oxypropylene group added, and k + 1 is 5 to 25. The ratio of the EO content to the total content of EO and PO is 70 to 100% by mass.)

  The asphalt mixture adhesion preventive agent of the present invention makes it easy to slide down asphalt mixture on plant facilities such as hoppers, skip elevators, belt conveyors, etc., or asphalt mixture on loading platforms such as dump trucks even at a low inclination angle. be able to. Further, even when the asphalt mixture is adhered, the asphalt mixture can be easily peeled off. Furthermore, since it is difficult to separate at room temperature or low temperature after dilution with water, the adhesion preventing effect and the peeling effect can be stably exhibited over time even after dilution with water and storage at normal 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), a component (B), and a component (C). In addition, the sum total of each mass ratio of (A) component, (B) component, and (C) component is 100 mass%. First, the component (A) will be described.

[Component (A)]
The component (A) used in the present invention is a polyoxyalkylene monoalkyl ether represented by the following formula (1).
R ¹ O— (EO) _m (PO) _n —H (1)

In the polyoxyalkylene monoalkyl ether represented by the formula (1), R ¹ is a hydrocarbon group having 1 to 4 carbon atoms. Specific examples include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an allyl group, an n-butyl group, a sec-butyl group, and a tert-butyl group, preferably an n-butyl group and a sec-butyl group. , A tert-butyl group.

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 4-20, Preferably it is 7-12.
If m + n is less than 4, the angle at which the asphalt mixture slides out from the inclined surface of the plant equipment or the loading platform of the dump truck (hereinafter also referred to as the slip-out angle) may increase. On the other hand, if m + n exceeds 20, the sliding angle may be increased, and it may be difficult to obtain a good peeling effect. Preferably, m is 4 to 20, and n is 2 to 12.

The ratio of the content of EO to the total content of EO and PO is 40 to 100% by mass, preferably 40 to 60% by mass. There exists a possibility that stability after water dilution may fall that the ratio of EO content is less than 40 mass%.
Regarding the arrangement order of EO and PO, EO and PO may be added in blocks or randomly, but random is preferable.

The polyoxyalkylene monoalkyl ether (A) represented by the formula (1) can be produced by a known method, for example, addition polymerization of a predetermined amount of ethylene oxide and propylene oxide to a monohydric alcohol having 1 to 4 carbon atoms. It is obtained by doing.
In addition, in the stage of addition polymerization of ethylene oxide and propylene oxide to monohydric alcohol, ethylene oxide and propylene oxide may be polymerized randomly or may be polymerized in block form. Also, the average added moles of oxyethylene groups (EO) and oxypropylene groups (PO), and the ratio of EO content to the total content of EO and PO, adjust the amount of ethylene oxide and propylene oxide used. By doing so, it can be set appropriately.

  The content rate of (A) component in the asphalt mixture adhesion inhibitor of this invention is 30-70 mass%, Preferably it is 40-50 mass%. If it is less than 30% by mass, the sliding angle may be increased, and if it exceeds 70% by mass, a good peeling effect may not be obtained.

[(B) component]
The component (B) used in the present invention is a polyoxyalkylene monoalkyl ether represented by the following formula (2).
R ² O— (EO) _k (PO) ₁ —H (2)

In the formula, R ² is a branched hydrocarbon group having 8 to 18 carbon atoms, preferably a hydrocarbon group having 10 to 12 carbon atoms. If the number of carbon atoms is less than 8, a good peeling effect and good stability of the water dilution solution may be difficult to obtain, and if the number of carbon atoms exceeds 18, good stability of the water dilution solution can be obtained. May be difficult. Further, when R ² is a straight-chain hydrocarbon group, it is difficult to obtain a good peeling effect, and it is difficult to obtain good stability of the water dilution at low temperatures.
Examples of the branched hydrocarbon group having 8 to 18 carbon atoms include 2-ethylhexyl group, 3,5,5-trimethylhexyl group, isodecyl group, isotridecyl group, isotetradecyl group, isohexadecyl group, An octadecyl group etc. are mentioned. An isodecyl group is preferred.

EO is an oxyethylene group and PO is an oxypropylene group. k is the average number of moles added of oxyethylene groups, and l is the average number of moles added of oxypropylene groups. The sum (k + 1) of both average added mole numbers is 5-25, Preferably it is 6-10.
If k + 1 is less than 5, the sliding angle may be increased, and it may be difficult to obtain good stability after water dilution. On the other hand, if k + 1 exceeds 25, the sliding angle may be increased, and a good peeling effect may not be obtained. Preferably, k is 5-25 and l is 0-7.

The ratio of the content of EO to the total content of EO and PO is 70 to 100% by mass, preferably 90 to 100% by mass. When the ratio of the EO content is less than 70% by mass, it may be difficult to obtain good stability after dilution with water.
The arrangement order of EO and PO may be EO and PO added in blocks or randomly, but blocks are preferred.

The polyoxyalkylene monoalkyl ether (B) represented by the formula (2) can be produced by a known method. For example, a predetermined amount of ethylene is added to a monohydric alcohol having 8 to 18 carbon atoms having a branch. It can be obtained by addition polymerization of oxide and propylene oxide.
In addition, in the stage of addition polymerization of ethylene oxide and propylene oxide to monohydric alcohol, ethylene oxide and propylene oxide may be polymerized randomly or may be polymerized in block form. Also, the average added moles of oxyethylene groups (EO) and oxypropylene groups (PO), and the ratio of EO content to the total content of EO and PO, adjust the amount of ethylene oxide and propylene oxide used. By doing so, it can be set appropriately.

  The content rate of (B) component in the asphalt mixture adhesion inhibitor of this invention is 25-58 mass%, Preferably it is 40-55 mass%. If it is less than 25% by mass, it may be difficult to obtain good stability of the water dilution, and if it exceeds 58% by mass, the sliding angle may be increased.

[Component (C)]
The component (C) used in the present invention is a hydrocarbon oil having a molecular weight of 100 to 600 or a monoester oil having a molecular weight of 100 to 600. The molecular weight is preferably 200 to 400, and monoester oil having a molecular weight of 200 to 400 is particularly preferable.
In the present invention, the molecular weight of the hydrocarbon oil represents a number average molecular weight, and the number average molecular weight of the hydrocarbon oil is determined in terms of polystyrene, for example, by gel permeation chromatography (GPC) measurement using tetrahydrofuran as a developing solvent. be able to.
The molecular weight of the monoester oil can be measured, for example, according to the ester value test method of JIS K 0070.

Specific examples of the hydrocarbon oil include a hydrocarbon oil obtained by purifying a spindle oil fraction by washing with sulfuric acid, polyisobutene, and the like, preferably polyisobutene.
Monoester oil is an ester oil obtained by dehydration condensation of a monovalent fatty acid and a monohydric alcohol. Specifically, methyl dodecanoate, isopropyl tetradecanoate, 2-ethylhexyl hexadecanoate, methyl octadecenoate, octadecene Examples include ethyl acrylate, butyl octadecenoate, 2-ethylhexyl octadecenoate, and preferably 2-ethylhexyl octadecenoate.
One or two or more of these hydrocarbon oils and monoester oils can be selected and used.

  The content rate of (C) component in the asphalt mixture adhesion inhibitor of this invention is 5-12 mass%, Preferably it is 7-10 mass%. If it is less than 5% by mass, it may be difficult to obtain a good peeling effect, and if it exceeds 12% by mass, it may be difficult to obtain good stability of the water dilution.

  In the asphalt composite material adhesion preventive agent of the present invention, the mass ratio of the content of the component (A) to the total content of the components (B) and (C) [A: (B + C)] is the sliding angle and the peeling effect. In view of the above, it is preferably 3: 7 to 7: 3, more preferably 4: 6 to 5: 5.

In the asphalt mixture adhesion preventive agent of the present invention, by containing a predetermined amount of the components (A), (B) and (C) as active ingredients, the asphalt mixture is slipped off and peeled off at a low inclination angle. The reason why the effect can be achieved is not necessarily clear, but the present inventors infer as follows.
In other words, the asphalt mixture adhesion inhibitor in which a predetermined amount of the components (A), (B) and (C) is mixed is not only used for metal surfaces such as inclined surfaces of factory facilities and dump truck platforms, but also for asphalt composites. It is also familiar with the surface of the material. Therefore, the adhesion preventing agent of the present invention can quickly coat the metal surface and the surface of the asphalt mixture, and can form a liquid film between the metal surface and the surface of the asphalt mixture. Thus, it is presumed that the liquid film is retained even at a high temperature of about 150 ° C. where the asphalt mixture is handled, and that it has an appropriate viscosity and exhibits good slipperiness. Moreover, it is speculated that the asphalt mixture adhesion preventive agent of the present invention exhibits a peeling effect because it appropriately penetrates into the asphalt on which adhesion is formed simultaneously with the formation of the liquid film and partially softens the asphalt.

[Asphalt mixture adhesion inhibitor]
The asphalt mixture adhesion inhibitor of the present invention is usually used after diluting with water. The dilution ratio is 3 to 100 times by mass, preferably 5 to 50 times by mass with respect to the stock solution. However, in some cases, the asphalt mixture adhesion inhibitor of the present invention may be used as a stock solution.

  The asphalt composite material adhesion preventive agent of the present invention is mainly used in facilities in a composite material factory such as a hopper and a skip elevator, but is used for a dump truck bed used for transportation, a paving machine finisher, a Macadam roller, a tire. You may use for a roller etc. The asphalt mixture adhesion preventive agent of the present invention can be used by spraying using a container such as a PET bottle or spraying it with a spray or the like.

  The asphalt mixture adhesion preventive agent of the present invention may contain an additive within a range not impairing the effects of the present invention. Examples of such additives include organic or inorganic salts, pH adjusters, bactericides, chelating agents, dyes, and fragrances.

  Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples.

[Examples 1-7, Comparative Examples 1-7]
The components shown in Tables 1 and 2 were mixed at a mass ratio shown in Table 2 to prepare an asphalt mixture adhesion inhibitor. The following tests were carried out for the obtained asphalt mixture adhesion inhibitors. In all the tests, the evaluations of “」 ”and“ ◯ ”were acceptable.
Table 1 shows explanations of symbols and the like in formula (1) for A1 to A4, and explanations of symbols and the like in formula (2) for B1 to B3. Moreover, the number average molecular weight of the hydrocarbon oil described in Table 2 is a value obtained in terms of polystyrene by GPC measurement using tetrahydrofuran as a developing solvent, and the molecular weight of the monoester oil is an ester value test of JIS K 0070. It is the value obtained by measuring according to the method.

(1) Asphalt mixture slip test In a 200 ml beaker, 10 ml of each asphalt mixture adhesion inhibitor was weighed, diluted 10 times with 90 ml of water, and stirred at 25 ° C for 10 minutes using a stirrer chip. 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 1 g of the above diluent on SS400 steel plate (size 80 cm × 50 cm), straight asphalt mixture (dense grain asphalt mixture, straight asphalt: 6% by mass, straight asphalt) heated to 150 ° C. on the sprayed surface Penetration 60-80: JIS K 2207) 500 g was loaded and allowed to stand. When the temperature reached 80 ° C., the iron plate was tilted, and the angle at which the asphalt mixture slipped (sliding angle) was measured.
As the diluted solution of the asphalt mixture adhesion inhibitor, each test was performed using a solution immediately after preparation of the diluted solution and a solution after standing at 25 ° C. for 1 week. The evaluation of adhesion prevention was performed according to the following evaluation criteria.
(Evaluation criteria)
A: All slide out and fall below 40 °.
○: All slide out and fall at a temperature greater than 40 ° and less than 50 °.
Δ: All slide out and fall below 50 ° and less than 80 °.
X: All slides out at an angle greater than 80 ° and falls, or does not slide out at an angle greater than 80 °.

(2) Peeling effect test SS400 of 20 cm × 15 cm of straight asphalt mixture heated to 150 ° C. (dense particle asphalt mixture, straight asphalt: 6 mass%, straight asphalt penetration: 60-80: JIS K-2207) 1 kg of steel was placed on the steel and left at room temperature for 10 minutes to prepare a steel with 1 kg of asphalt mixture.
Further, 100 ml of each asphalt mixture adhesion inhibitor was weighed in a 1000 ml beaker, diluted 10 times with 900 ml of water, and stirred at 25 ° C. for 10 minutes using a stirrer chip. Thereafter, the steel material to which the asphalt composite material has adhered is diluted 10 times with the solution immediately after each asphalt composite material adhesion inhibitor has been diluted 10 times with water, and then allowed to stand at 25 ° C. for 1 week. The steel material was immersed in the liquid so that the asphalt mixture was completely immersed, and was allowed to stand at 70 ° C. for 30 minutes. The steel material was taken out from the liquid, the steel material was inclined at an angle of 70 degrees, and the straight asphalt mixture was dropped. The asphalt mixture adhering to the steel material was weighed. The peelability was evaluated according to the following evaluation criteria.
(Evaluation criteria)
(Double-circle): The adhesion amount is less than 2g.
○: Adhesion amount is 2 g or more and less than 5 g.
X: Amount of adhesion is 5 g or more.

(3) Stability test at the time of water dilution 50 ml of a 10-fold diluted solution of each asphalt mixture prepared in the same manner as in the above (1) asphalt mixture slip test was put in a 100 ml screw tube, and a -5 ° C constant temperature bath, After standing for 1 week in a thermostatic chamber at 25 ° C., the appearance was evaluated according to the following three-stage criteria.
(Evaluation criteria)
A: Uniform and transparent, no separation is observed.
○: Although it is slightly cloudy, no separation is observed.
X: Separation is observed.

  The asphalt mixture adhesion preventive agents of Examples 1 to 7 according to the present invention can lower the slide-out angle of the asphalt mixture, have good slide-out properties, and have good peeling effect and stability after dilution with water. there were.

On the other hand, polyoxyethylene (30 mol) tetraoleic acid sorbite (B ′), which does not contain the component (A) and has a linear acyl group and polyoxyethylene added to a polyhydric alcohol instead of the component (B) In addition, the anti-adhesive agent (Comparative Example 1) containing soybean oil and palm oil (C ′), which are triglycerides instead of the component (C), has a good peeling effect and a good sliding property immediately after preparation. Although obtained, a good peeling effect and good slip-out property were not obtained after one week, and good stability after dilution with water was not obtained.
(A) No component is contained, polyoxyethylene (7 mol) dodecyl ether (B ′), which is a linear hydrocarbon group, is contained in place of component (B), and terpene is substituted in place of component (C) In the anti-adhesion agent (Comparative Example 2) containing d-limonene (C ′), which is a system compound, a good peeling effect and good slip-out property can be obtained immediately after preparation, but a good peeling effect after one week, Good sliding property was not obtained, and good stability after dilution with water was not obtained.

In the anti-adhesive agent (Comparative Example 3) containing only the polyoxyethylene (9 mol) polyoxypropylene (10 mol) monobutyl ether (A4) without containing the component (B) and the component (C), after water dilution However, good slip-out property and good peeling effect could not be obtained.
(A) Polyoxyethylene (2 mol) polyoxypropylene (1 mol) dimethyl ether (A ′), polyoxyethylene (6 mol) isodecyl ether (B1), polyisobutene having hydroxyl groups blocked with methyl ether instead of component (A) With the anti-adhesive agent containing (C) (Comparative Example 4), good peeling effect and good stability after dilution with water were obtained, but good slip-out property was not obtained.

In (Comparative Example 5) which does not contain (A) component and contains polyoxyethylene (8) 2-ethylhexyl ether (B2) and isopropyl tetradecanoate (C), good peeling effect, good after water dilution Although stability was obtained, good slip-out property was not obtained.
With the anti-adhesive agent (Comparative Example 6) containing polyoxyethylene (9) methyl ether (A1) and polyoxyethylene (8) 2-ethylhexyl ether (B2), good slippage is obtained, but good peeling The effect was not obtained.
(B) In the anti-adhesive agent (comparative example 7) which does not contain a component and contains polyoxyethylene (9) methyl ether (A1) and isopropyl tetradecanoate (C), good slip-out property, peeling effect, water dilution Later stability was not obtained.

Claims (1)

Polyoxyalkylene monoalkyl ether (A) represented by formula (1), polyoxyalkylene monoalkyl ether (B) represented by formula (2), hydrocarbon oil or monoester oil having a molecular weight of 100 to 600 (C Asphalt mixture adhesion prevention in which the mass ratio of (A) is 30 to 70 mass%, the mass ratio of (B) is 25 to 58 mass%, and the mass ratio of (C) is 5 to 12 mass% Agent.
R ¹ O— (EO) _m (PO) _n —H (1)
(In the formula, R ¹ is a hydrocarbon group having 1 to 4 carbon atoms. EO is an oxyethylene group, PO is an oxypropylene group, m is the average number of moles added of the oxyethylene group, and n is an oxypropylene group. (M + n is 4 to 20. The ratio of the content of EO to the total content of EO and PO is 40 to 100% by mass.)
R ² O— (EO) _k (PO) ₁ —H (2)
(Wherein R ² is a branched hydrocarbon group having 8 to 18 carbon atoms, EO is an oxyethylene group, PO is an oxypropylene group, k is the average number of moles of oxyethylene group added, l is (The average number of moles of oxypropylene group added, and k + 1 is 5 to 25. The ratio of the EO content to the total content of EO and PO is 70 to 100% by mass.)