JP2012211248A - Antiadhesive agent for asphalt mixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antiadhesive agent for an asphalt mixture, excellent in retainability to the coated surface, high in antiadhesion effects of asphalt mixture, and sustaining antiadhesive effects.SOLUTION: This antiadhesive agent for an asphalt mixture comprises: (A) 0.05-1 mass% of water-soluble polysaccharide; (B) 0.1-5 mass% of one or two or more surfactants selected from a betaine type surfactant, an amidoamino acid type surfactant, amino acid type surfactant, alkyl polyetheramine type surfactant, alkyl polyetheramide type surfactant, and amine oxide type surfactant; and (C) 94-99.85 mass% of a 2-9C water-soluble polyhydric alcohol, where the component (B) is a surfactant such that a mixture liquid in which the mass ratio of the component (B), water and glycerol is 5:15:80, becomes transparent at 25°C.

Description

  The present invention relates to an asphalt mixture adhesion preventive agent for preventing asphalt mixture from adhering to a metal surface and the like, and is excellent in persistence on a coating surface such as a metal surface and has an effect of preventing asphalt mixture adhesion. The present invention relates to an asphalt mixture adhesion preventing agent that is high and has an adhesion preventing effect.

  Asphalt composite material, which is a mixture of asphalt and aggregate, is used for road paving, and is manufactured and installed at a high temperature of about 110 to 180 ° C. in an asphalt composite plant. During the construction, there has been a problem that the asphalt composite material adheres to a hopper, a skip elevator, a dump carrier, etc. on which the asphalt composite material is loaded.

  Therefore, conventionally, mineral oil such as light oil and heavy oil, and animal and vegetable oils and fats are directly or emulsified and dispersed in water, and they are spread directly on dump trucks. Asphalt mixture was prevented from adhering by spraying on the surface (Patent Document 1, Patent Document 2). However, this method has a problem that mineral oil such as light oil and heavy oil and animal and vegetable oils and fats dissolve in asphalt and soften the asphalt mixture.

  As an adhesion preventing agent for solving this problem, an asphalt mixture adhesion preventing agent using a polyhydric alcohol is known. However, the asphalt mixture adhesion inhibitor using polyhydric alcohol has a problem that it has poor persistence on the metal surface and has a low adhesion preventing effect as compared with mineral oils and animal and vegetable oils. In addition, the adhesion inhibitor remaining on the metal surface is also removed from the surface as soon as the asphalt mixture is lowered, so that the adhesion prevention effect is lost, and when loading asphalt mixture again, the adhesion inhibitor is sprayed each time. There was also a problem with the sustainability of the adhesion prevention effect. In order to solve these problems, an asphalt mixture adhesion preventive agent using a combination of polyvinyl alcohol, polyalkylglycol and a derivative or an olefin / maleic acid copolymer has been disclosed. However, the adhesion preventing effect and the persistence of the adhesion preventing effect are not sufficient (Patent Document 3, Patent Document 4, and Patent Document 5).

JP 7-292346 A International Publication No. 03/035809 JP 2006-241409 A US Pat. No. 6,486,249 JP 2010-1000073 A

  The present invention solves the above-mentioned conventional problems, and its purpose is to prevent asphalt mixture adhesion that is excellent in persistence on the coating surface, has high anti-adhesion effect of asphalt mixture, and maintains the anti-adhesion effect. Is to provide an agent.

  As a result of intensive studies to solve the above problems, the present inventors have found that a water-soluble polysaccharide, a betaine surfactant, an amide amino acid surfactant, an amino acid surfactant, an alkyl polyether amine Type surfactant, alkyl polyetheramide type surfactant, amine oxide type surfactant selected from one or more surfactants and water-soluble polyhydric alcohol having 2 to 9 carbon atoms Asphalt composite anti-adhesive agent, wherein the surfactant is a surfactant prepared by mixing a surfactant, water, and glycerin at a mass ratio of 5:15:80 and becomes transparent at 25 ° C. It has been found that the material adhesion preventing agent has excellent persistence on the coating surface, has a high adhesion preventing effect on asphalt composites, and the adhesion preventing effect is sustained.

That is, the present invention
(A) 0.05 to 1% by mass of a water-soluble polysaccharide,
(B) 1 selected from betaine surfactants, amide amino acid surfactants, amino acid surfactants, alkyl polyether amine surfactants, alkyl polyether amide surfactants, amine oxide surfactants 0.1 to 5% by mass of seeds or two or more surfactants,
(C) an asphalt mixture adhesion inhibitor comprising 94 to 99.85% by mass of a water-soluble polyhydric alcohol having 2 to 9 carbon atoms,
The component (B) relates to an asphalt mixture adhesion preventive agent which is a surfactant in which a mixed solution in which the mass ratio of the component (B), water, and glycerin is 5:15:80 becomes transparent at 25 ° C.

  According to the asphalt mixture adhesion preventive agent of the present invention, it is excellent in the persistence on the coating surface, has a high effect of preventing the adhesion of the asphalt mixture, and has an effect of maintaining the adhesion prevention effect.

  Hereinafter, the present invention will be described in more detail. The asphalt mixture adhesion inhibitor of the present invention comprises (A) a water-soluble polysaccharide, (B) a surfactant, and (C) a polyhydric alcohol. First, (A) the water-soluble polysaccharide will be described.

[(A) Water-soluble polysaccharide]
The component (A) used in the present invention is a water-soluble polysaccharide. The polysaccharides used in the present invention are classified into natural and semisynthetic compounds. Examples of natural compounds include starch, dextrin, pullulan, alginic acid, xanthan gum, carrageenan, gum arabic, and guar gum. Examples of the semi-synthetic compound include methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose or a salt thereof, cationized cellulose, and cationized starch. Xanthan gum is preferable from the viewpoint of adhesion prevention effect and durability of adhesion prevention effect. These polysaccharides preferably have a 1% aqueous solution with a viscosity of 100 to 10,000 mPa · s. The viscosity can be measured at 25 ° C. and 6 rpm using a B-type viscometer (manufactured by Toki Sangyo Co., Ltd., VISCOMETER TV-10). When the component (A) is used, it can be used alone or as a mixture of two or more.

  (A) A component is the range of 0.05-1 mass% in an asphalt mixture adhesion inhibitor, Preferably it is the range of 0.1-1 mass%. When the component (A) is less than 0.05% by mass, the persistence of the adhesion inhibitor, the adhesion preventing effect and the adhesion preventing effect may be deteriorated. It can be difficult.

[(B) Surfactant]
Component (B) used in the present invention is a betaine type surfactant, an amide amino acid type surfactant, an amino acid type surfactant, an alkyl polyether amine type surfactant, an alkyl polyether amide type surfactant, an amine oxide type One or more surfactants selected from surfactants. For example, as the betaine type surfactant, the surfactant represented by the formula (1), the amide amino acid type surfactant and the amino acid type surfactant as the surfactant represented by the formulas (2), (3) and (4) The surfactant shown in Formula (5) can be used as the alkyl polyether amine surfactant and the alkyl polyether amide surfactant, and the surfactant shown in Formula (6) can be used as the amine oxide surfactant. . In addition, as (B) component, in each of said 6 types of surfactant, single or 2 or more types of surfactant can be used.

(Wherein R ¹ is an alkyl group, alkenyl group, acyl group or R ⁴ NH (CH ₂ ) ₁ having 10 to 18 carbon atoms, R ⁴ is an alkyl group, alkenyl group or acyl group having 10 to 18 carbon atoms, R ² , R ³ is an alkyl group having 1 to ³ carbon atoms, and X ¹ is — (CH ₂ ) _m COO ⁻ , —CH ₂ CH ₂ (OH) CH ₂ SO ₃ ^— or — (CH ₂ ) _n PO ₄ ^—. And l, m and n are integers of 1 to 3.)

(Wherein R ⁵ is an alkyl group, alkenyl group or acyl group having 10 to 18 carbon atoms, X ² is hydrogen or hydroxyethyl group, Y ¹ is hydrogen, hydroxyethyl group or — (CH ₂ ) _m COOM ¹ , Z ¹ is — (CH ₂ ) _n COOM ² , M ¹ and M ² are hydrogen, alkali metal, alkaline earth metal, ammonium or organic ammonium, and l, m and n are integers of 1 to 3. )

(Wherein R ⁶ is an alkyl group, alkenyl group or acyl group having 10 to 18 carbon atoms, X ³ is hydrogen, hydroxyethyl group or — (CH ₂ ) _m COOM ³ , Y ² is — (CH ₂ ) _n. COOM ⁴ wherein M ³ and M ⁴ are hydrogen, alkali metal, alkaline earth metal, ammonium or organic ammonium, and m and n are integers of 1 to ^3. )

(Wherein R ⁷ is an alkyl group, alkenyl group or acyl group having 10 to 18 carbon atoms, M ⁵ is hydrogen, alkali metal, alkaline earth metal, ammonium or organic ammonium; It is an integer of 3.)

(In the formula, R ⁸ is an alkyl group, alkenyl group or acyl group having 10 to 18 carbon atoms, an integer of m ≧ 0 and n ≧ 0, and m + n is 1 to 30.)

(Wherein R ⁹ is an alkyl group, alkenyl group, aliphatic acyl group or R ¹² NH (CH ₂ ) _n having 10 to 18 carbon atoms, and R ¹² is an alkyl group, alkenyl group or aliphatic acyl having 10 to 18 carbon atoms. The groups R ¹⁰ and R ¹¹ are alkyl groups or hydroxyalkyl groups having 1 to 3 carbon atoms, and n is an integer of 1 to 3).

  In addition, lithium, sodium, potassium etc. are mentioned as an alkali metal in said formula (2)-(4), Preferably, they are sodium and potassium. Examples of the alkaline earth metal include calcium, strontium, barium and the like, preferably calcium. Examples of organic amines in organic ammonium include alkanolamines such as monoethanolamine, diethanolamine and triethanolamine, and alkylamines such as diethylamine and triethylamine.

The component (B) is preferably one that is uniformly dissolved in the polyhydric alcohol of the component (C), and the surfactant of the component (B) in the present invention is a surfactant, water, and glycerin in a mass ratio of 5:15: When mixed at 80, the liquid mixture becomes transparent at 25 ° C. In the case of a surfactant in which the mixed solution becomes clouded or separated, the persistence of the anti-adhesive agent may be deteriorated.
The determination of whether or not it is transparent can be made by visually observing the appearance after preparing the mixed solution.

  The component (B) is in the range of 0.1 to 5% by mass, and preferably in the range of 0.5 to 3% by mass in the asphalt mixture adhesion inhibitor. When the component (B) is less than 0.1% by mass, the persistence of the adhesion inhibitor, the adhesion preventing effect and the adhesion preventing effect may be deteriorated. May not be obtained.

[(C) polyhydric alcohol]
(C) component used for this invention is a C2-C9 water-soluble polyhydric alcohol. The water-soluble polyhydric alcohol used in the present invention is liquid at room temperature and has a solubility in water of 1,000 g / L or more. Since the asphalt mixture adhesion inhibitor may be released to the soil for use, it is preferable that the environmental load is small, and from that viewpoint, the preferred component (C) is glycerin. Component (C) can be used alone or in combination.

  The component (C) is in the range of 94 to 99.85% by mass, preferably in the range of 96 to 99.4% by mass, in the asphalt mixture adhesion inhibitor. If the component (C) is less than 94% by mass, the persistence of the adhesion preventing effect and the adhesion preventing effect may be deteriorated. Sustainability may worsen.

  The asphalt mixture adhesion preventing agent of the present invention can be prepared by mixing the components (A) to (C) by a known method. For example, the (A) water-soluble (C) polyhydric alcohol can be prepared. It can prepare by mix | blending with polysaccharide and (B) surfactant, and stirring. The asphalt mixture adhesion preventive agent of the present invention is usually diluted with water and used, for example, diluted about 10 times with water.

  The asphalt mixture adhesion preventive agent of the present invention may be used in combination with other additives such as pigments, rust preventives and preservatives within the range not impairing the performance of the present invention.

Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples.
(B) About the component and other components, the compound of B1-12 shown in Table 1 and B'1-4 was used. In addition, each symbol in Table 1 represents a symbol in each formula (1) to (6) described in this specification. Moreover, the external appearance of the liquid mixture in Table 1 prepared the liquid mixture which mixed this compound, water, and glycerin by mass ratio 5:15:80 using the compound of B1-12 and B'1-4, It is the evaluation of transparency conducted according to the following criteria. That is, the mixed solution is placed in a glass container having a length of 3 cm, a width of 3 cm, and a height of 5 cm, and left to stand in a thermostatic bath at 25 ° C. for 3 hours. Judgment was made based on whether or not the character of the point was visually distinguishable, and the transparency was evaluated according to the following three criteria.

(Evaluation criteria)
A: Uniform and transparent, and characters can be easily distinguished.
○: Although it is slightly cloudy, the characters can be identified uniformly.
X: The characters are cloudy and cannot be distinguished. Or the mixture is separated.

  Asphalt mixture adhesion inhibitors were prepared at the ratios shown in Tables 2 to 5, and were subjected to the following tests. The results are shown in Tables 2-5.

<Asphalt compound adhesion inhibitor test>
(1) Residuality test of asphalt mixture adhesion preventive agent After spraying 1 g of a solution obtained by diluting each asphalt mixture adhesion inhibitor 10 times with water onto SS400 steel material of 20 cm x 15 cm, the steel material at an angle of 45 degrees. It was tilted 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

(Evaluation criteria)
○: Remaining rate is 95% or more.
Δ: Residual rate is less than 95% to 60% or more.
X: Residual rate is less than 60%.
○ Adhesion preventive agent was accepted.

(2) Adhesion prevention effect test 1 g of a solution obtained by diluting each asphalt mixture adhesion inhibitor 10 times with water is sprayed on 20 cm × 15 cm SS400 steel, and then heated to 150 ° C. Compound material, straight asphalt: 6%, straight asphalt penetration 60-80: JISK2207) is placed on top of it, further loaded with 3.0 cm of SS400 steel of 20 cm x 15 cm and left at room temperature for 1 minute. . The upper SS400 steel material was peeled off, the steel material was inclined at an angle of 45 degrees, and the straight asphalt composite material was dropped. Then, the SS400 steel material sprayed with the chemical solution was weighed to determine the adhesion amount of the straight asphalt composite material. Evaluation criteria were determined according to the following evaluation criteria.

(Evaluation criteria)
A: The amount of adhering straight asphalt mixture is less than 5 g.
A: The amount of straight asphalt mixture adhering is 5 g or more and less than 10 g.
(Triangle | delta): The amount of straight asphalt compound material adhesion is 10g or more and less than 20g.
X: The amount of straight asphalt mixture adhering is 20 g or more.
◎, ○ anti-adhesive agent was accepted.

(3) Sustainability test of anti-adhesion effect Straight asphalt compound (1 g) sprayed on a 20 cm x 15 cm SS400 steel solution diluted 10 times with each asphalt compound anti-adhesive agent with water, then heated to 150 ° C ( Dense grained asphalt mixture, straight asphalt: 6%, straight asphalt penetration 60-80: JISK2207) is placed on top of it, and further 20kg x 15cm SS400 steel is loaded with 3.0kg weight on it for 1 minute at room temperature Left alone. The upper SS400 steel was peeled off, the steel was tilted at a 45 degree angle, and the straight asphalt mixture was dropped. This operation was repeated until the adhesion amount of the straight asphalt mixture exceeded 10 g. Evaluation criteria were determined according to the following evaluation criteria.

(Evaluation criteria)
(Double-circle): Even if it repeated 5 times, the adhesion amount of compound material did not exceed 10g.
○: 10 g exceeded 3 to 5 times.
(Triangle | delta): It exceeded 10g in 2 times.
X: Over 10 g at one time.
◎, ○ anti-adhesive agent was accepted.

As shown in Tables 2 and 3, according to the adhesion preventive agent of the embodiment according to the present invention, it is excellent in the persistence to the steel material, the adhesion preventing effect of the asphalt mixture is high, and the adhesion preventing effect is sustained. Recognize.
On the other hand, as shown in Tables 4 and 5, none of the adhesion preventing agents of Comparative Examples passed all of the persistence, the adhesion preventing effect, and the sustainability.

Claims (1)

(A) 0.05 to 1% by mass of a water-soluble polysaccharide,
(B) 1 selected from betaine surfactants, amide amino acid surfactants, amino acid surfactants, alkyl polyether amine surfactants, alkyl polyether amide surfactants, amine oxide surfactants 0.1 to 5% by mass of seeds or two or more surfactants,
(C) an asphalt mixture adhesion inhibitor comprising 94 to 99.85% by mass of a water-soluble polyhydric alcohol having 2 to 9 carbon atoms,
The asphalt mixture adhesion preventing agent whose said (B) component is surfactant which becomes transparent at 25 degreeC in the liquid mixture whose mass ratio of (B) component, water, and glycerol is 5:15:80.