JPH0790286A - Asphalt adhesion-preventing agent - Google Patents

Abstract

PURPOSE:To obtain an asphalt adhesion-preventing agent capable of preventing the adhesion of asphalt mixed aggregate to tire loader in asphalt pavement and reducing the aging of tire. CONSTITUTION:An asphalt adhesion-preventing agent is composed of a mineral oil having a kinematic viscosity of 3.0-22cst at 40 deg.C, a pour point of <=0 deg.C and an aniline point of >=75 deg.C.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an asphalt anti-adhesive agent, and more particularly to an asphalt anti-adhesive agent which is excellent in the asphalt anti-adhesion property at the time of rolling of a tire loader and has less tire aging.

[0002]

2. Description of the Related Art When asphalt paving, a tire loader which is a compacting machine is used. If the tire loader is used for rolling, the aggregate mixed with asphalt adheres to the tire, and rolling cannot be performed properly. Therefore, light oil has been conventionally used as an asphalt anti-adhesive agent, but there are problems that the anti-adhesion machine performance is not sufficient and that asphalt is melted or the tire is aged.

[0003]

DISCLOSURE OF THE INVENTION As a result of extensive studies to solve the above problems, the present invention makes it possible to clean a pavement surface and to age a tire by using a certain selected mineral oil. The present invention has been completed by finding that the amount of the asphalt mixed with the asphalt is prevented from adhering to the tire.

That is, the present invention has a kinematic viscosity at 40 ° C. of 3.
The present invention relates to an asphalt anti-adhesion agent, characterized by comprising mineral oil having a pour point of 0 to 22 cst, a pour point of 0 ° C. or lower, and an aaniline point of 75 ° C. or higher.

The mineral oil of the present invention has a kinematic viscosity at 40 ° C. of 3.0 to 22 cst, preferably 5.0 to 15 cst. Here, when the kinematic viscosity is less than 3.0 cst, there is almost no adhesion amount to the tire, and in order to prevent adhesion of the asphalt aggregate, a large amount must be applied. Therefore, aging of the tire is accelerated. On the contrary, if it exceeds 22 cst, there is a problem that it remains on the asphalt pavement surface. The mineral oil of the present invention has a pour point of 0 ° C or lower, preferably -5 ° C.
It is the following. There is a problem because it solidifies in winter above 0 ° C. Further, the mineral oil of the present invention has an aniline point of 75 ° C or higher, preferably 80 ° C or higher. If the temperature is lower than 75 ° C, tire aging will be accelerated.

As the mineral oil of the present invention, mineral oils obtained by various methods can be used as long as they have the above-mentioned properties, and there is no particular limitation. Specific examples of such mineral oil include paraffin-based crude oil, intermediate-based crude oil, naphthene-based crude oil distilled under atmospheric pressure, or those obtained by distilling the residual oil of atmospheric distillation under reduced pressure, or A refined product of these distillate oils can be used. The purification method is not particularly limited, and various methods are adopted. Usually, (a) hydrogen treatment (b) dewaxing treatment (c) solvent extraction treatment (d) alkali distillation or sulfuric acid washing treatment (e) white clay treatment and the like are carried out individually or in combination in an appropriate order.

The mineral oil of the present invention includes antioxidants, rust inhibitors, pour point depressants, extreme pressure agents, viscosity index improvers, detergents, antifriction agents, antifoaming agents (silicone compounds) used in various lubricating oils. A corrosion inhibitor or the like can be added.

The mineral oil of the present invention can also be used as an aqueous dispersion, and is made into an emulsion with water at an arbitrary ratio using a general emulsifier. Generally, the emulsifier is preferably nonionic polyoxyethylene nonylphenyl ether, anionic sodium dodecylbenzene sulfonate, etc., but other emulsifiers can be used. In this case, as a rule, mix with water at the time of field use.

The main use of the present invention is an asphalt adhesion preventive agent for tire loaders, but it can also be applied to other asphalt paving machines.

[0010]

The asphalt adhesion preventive agent of the present invention can prevent the asphalt-mixed aggregate from adhering to the tire of the loader and reduce the aging of the tire.

[0011] The physical properties of Examples following Examples 1 to 5 described in more detail with reference to the present invention examples and comparative examples was adjusted to Comparative Examples 1 to 3 Aniline point and kinematic viscosity mineral oil in Table 1. Example 5 is prepared by using the mineral oil of Example 1 and mixing 5% of polyoxyethylene nonylphenyl ether as an emulsifier. Table 1 Example Aniline point Kinematic viscosity Pour point Rubber swelling test Comparative example ℃ (40 ℃) cst ℃ Volume change% Example 1 80.5 4.92 -12.5 31 Example 2 79.3 9.71 -12.5 26 Example 3 97.7 9.53 -12.5 22 Example 4 101.3 13.28 -12.5 16 Example 5 76.4 5.24 -20 32 Comparative Example 1 71.0 3.27 -5 53 Comparative Example 2 53.7 8.57 -55 50 Comparative Example 3 76.2 1.51 -40 or less 55 Rubber swelling test A rubber swelling test was carried out in accordance with JIS K601 in order to evaluate the aging degree of the tire. Test temperature 100 ℃, test time 10 hours, test container outer diameter 60mm, length about 130
A 150 ml sample oil was placed in a glass bottle of mm, and a rubber test piece was prepared by cutting a new tire using a tire loader manufactured by Sakai Heavy Industries Ltd. into a rectangular block of 20 × 20 × 50 mm. The results obtained are shown in Table 1. As is clear from the results, all of Examples 1 to 5 were found to have excellent performance. Adhesion resistance test For the samples of Examples 2, 4 and 5 and Comparative Example 1, the asphalt rolling was performed using a tire loader manufactured by Sakai Heavy Industries, Ltd., and the adhesion state was observed. In Example 5, 50% of water was mixed to prepare an emulsion. 180-200 ml / m ²
The sample was sprayed at a rate of 5 to 6 km / h and compressed at a speed of 5 to 6 km / h. The results are shown in Table 2. The examples showed very good results. Table 2 Example Asphalt adhesion status Comparative example Example 1 ◎ Example 4 ◎ Example 5 (emulsion) ○ Comparative Example 1 △ ◎: No adhesion ○: Very little adhesion △: Little adhesion

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masayuki Hirao 1-1-14 Nishibensai, Asaka City, Saitama Prefecture (72) Inventor Misutoku Misumi, 357-69 Mizuno, Sayama City, Saitama Prefecture

Claims (2)

[Claims] 1. A kinematic viscosity at 40 ° C. of 3.0 to 22 c.
st, an asphalt anti-adhesion agent comprising a mineral oil having a pour point of 0 ° C. or lower and an aniline point of 75 ° C. or higher. 2. An asphalt anti-adhesion agent obtained by emulsifying the mineral oil according to claim 1 with water using an emulsifier.