JPH11315267A - Asphalt adhesion preventive, and method for preventing asphalt adhesion - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an asphalt adhesion preventive which is excellent in release effects, has a good workability, and does not affect the slip resistance of a road surface by incorporating a high-viscosity silicone oil into the same and by specifying the slip resistance of an asphalt-paved road surface imparted by the same after compaction with a compacting roller. SOLUTION: This asphalt adhesion preventive contains a high-viscosity silicone oil and imparts a slip resistance of 60 BPN or higher to an asphalt-paved road surface after compaction with a compacting roller. As the high-viscosity silicone oil, polydimethylsiloxane having a kinematic viscosity of 1,000 cSt or higher at 25 deg.C in an amt. of 1-50 wt.% is desirable; and an amino-modified silicone having a kinematic viscosity of 100 cSt or higher at 25 deg.C and a polyether-modified silicone having a kinematic viscosity of 100 cSt or higher at 25 deg.C can be used, too. A high-viscosity silicone is emulsified with a surfactant or diluted with a diluent, then is applied to a pavement work roller, a pavement work machine, a load-carrying platform of a transport truck, etc., and is used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-adhesion agent and an anti-adhesion method for preventing asphalt for paving from adhering to paving work equipment such as compaction rollers and trucks. Specifically, in the construction of asphalt pavement,
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an asphalt anti-adhesion agent and an anti-adhesion method for applying asphalt to a truck bed or a compaction roller for smoothing a pavement road surface, thereby preventing asphalt from being applied.

[0002]

2. Description of the Related Art Asphalt used for road pavement is generally a petroleum asphalt obtained by distilling a crude oil and removing light components, and a high-grade rubber or resin for improving the durability of the petroleum asphalt. Modified asphalt to which a molecular material is added is used. When paving such asphalt on a road surface, the asphalt is usually transported to a work site by a truck, spread on the road surface, and compacted smoothly using a roller for compaction work such as a road roller or a tire roller.

[0003] Asphalt during transportation and construction is kept at a high temperature to reduce viscosity and increase flowability.
The asphalt with increased fluidity tends to adhere to a truck bed or a roller for compaction work, thereby reducing workability. Conventionally, in order to prevent such asphalt adhesion, petroleum solvents such as crude oil distillates and vegetable oils are used as release agents.
(Release agent). However, the effect of such a release agent is not sufficient, and there is a problem that the release effect is extremely low, especially for drainable asphalt that has been frequently used in recent years.

[0004] Drainable asphalt has an appropriate space formed in a structure composed of aggregate and asphalt. Therefore, since the water passes through the space, it has excellent drainage properties, can prevent puddles on the road surface, and is effective in preventing slip (prevention of decrease in hydroplane). Further, the appropriate gap has an effect of preventing noise due to friction between the road surface and the tire. For this reason, drainable asphalt has recently become widely used. On the other hand, drainage asphalt uses a material that increases the bond with the aggregate and lowers the density of asphalt structures. Asphalt easily adheres to rollers and the like.

When a large amount of an organic solvent is used in order to enhance the effect of preventing adhesion to drainage asphalt, there is a concern that the surface of the asphalt may be discolored or deteriorated.
Further, it is not preferable from the viewpoint of the influence on the environment. For this reason, an anti-adhesion agent that does not cause environmental pollution, is safe, and has little chemical influence on asphalt has been demanded.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the conventional release agents that the release effect is insufficient, that application to drainage asphalt is difficult, and that the effect on the environment is a concern. It is an object of the present invention to provide an anti-adhesion agent which has an excellent peeling effect even with drainable asphalt and has good workability. Another object of the present invention is to provide a method for preventing adhesion that does not affect the slip resistance of a road surface.

[0007]

Means for Solving the Problems The present inventors focused on the excellent release effect and environmental safety of silicone oil (organopolysiloxane), and used a high-viscosity silicone oil, preferably an aqueous emulsion. By using in the form described above, the above-mentioned conventional problem is overcome. That is, the substance of the present invention is (1) an asphalt adhesion inhibitor containing a high-viscosity silicone oil, the asphalt adhesion inhibitor having a slip resistance value of 60 BPN or more on an asphalt pavement surface after compaction by a compaction roller. It is. The high-viscosity silicone used for the antiadhesive includes (2) 1 to 50 parts by weight of polydimethylsiloxane having a kinematic viscosity at 25 ° C. of 1,000 cst or more;
Amino-modified silicone having a kinematic viscosity at 5 ° C of 100 cst or more,
(4) Polyether-modified silicone having a kinematic viscosity at 25 ° C. of 100 cst or more. These high-viscosity silicones (2) to (4) include (5) phenylmethylsiloxane, hydroxymethylpolysiloxane, alkoxymethylpolysiloxane, alkyl-modified polysiloxane, allylaralkyl-modified polysiloxane, and liquid having a three-dimensional structure. A silicone resin, a liquid silicone resin partially containing the above substituent, or a high-viscosity silicone composed of one or more oligomers thereof may be used in combination. Also,
(6) An anti-adhesion agent adjusted to have a total kinematic viscosity of 300 cst or less after dilution, wherein at least one or two or more high-viscosity silicone oils of (2) to (4) are contained. May be.

In the method of the present invention, any of the above-mentioned silicone oils (1) to (6) is applied to a pavement working machine or a transport truck carrier to prevent asphalt from adhering. Asphalt includes drainable asphalt. Further, the present invention is also applicable to a high-viscosity decolorizing binder (surreal color box) which can be called modified asphalt.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below. The asphalt adhesion inhibitor of the present invention contains a high-viscosity silicone oil. High viscosity silicone means a liquid compound having a siloxane bond. For example, in the case of dimethylpolysiloxane, the kinematic viscosity at 25 ° C. (hereinafter simply referred to as viscosity) is 1,000 cst (centistokes).
Those having the above high viscosity are selected. The higher the viscosity, the better the peeling effect. Although a stripping effect can be obtained with dimethylpolysiloxane having a viscosity of less than 1,000 cst, there is no great difference from conventional petroleum-based solvents and vegetable oils, and no remarkable improvement effect is observed. In addition, these viscosities are commercially available rotational viscometer,
For example, it can be easily measured with a Brookfield viscometer. The anti-adhesion agent of the present invention containing the high-viscosity silicone exhibits a remarkably superior peeling effect (adhesion prevention effect) on asphalt as compared with conventional petroleum solvents and vegetable oils.

[0010] The asphalt adhesion inhibitor of the present invention has a slip resistance of 60 BP on the asphalt surface after compaction.
It must be at least N, preferably at least 65 BPN. That is, the slip resistance value of the asphalt surface is increased. Generally, when the slip resistance of the road surface is too low, the vehicle easily slips. When a conventional anti-adhesive agent such as light oil is applied to a pavement work roller to compact asphalt, the asphalt surface slip resistance is as low as about 56 BPN. In the case of the high-viscosity silicone oil of the present invention, the slip resistance is much higher than that of light oil. In addition, the anti-adhesion agent of the present invention exhibits remarkably superior release effect as compared with conventional petroleum-based solvent or vegetable oil-based release agent as well as the pavement operation roller for the reasons described below. Alternatively, it can be used for asphalt adhesion on a transport truck bed.

The high viscosity modified silicone of the antiadhesive agent according to the present invention includes amino-modified silicone having a viscosity of 100 cst or more (preferably 1,000 cst or more) and amino-modified silicone having a viscosity of 100 cst or more (preferably 1000 cst or more). A polyether-modified silicone can also be used. Amino-modified silicone is a liquid compound in which a part of the methyl group of dimethylpolysiloxane having a siloxane bond is substituted with an organic group such as an amino group and an aminoalkyl group containing an amino group. May be in a chain. Further, even if it has an organic substituent other than an amino group, it is included in the amino-modified silicone. Polyether-modified silicone is a liquid compound in which some of the methyl groups of dimethylpolysiloxane having a siloxane bond have been substituted with an organic group containing a polyoxyalkylene group. good. Further, even if it has an organic substituent other than the polyoxyalkylene group, it is included in the polyether-modified silicone.

An amino-modified silicone having a viscosity of less than 100 cst and / or a polyether-modified silicone having a viscosity of less than 1000 cst have an unsatisfactory release effect, and are not significantly different from conventional petroleum-based solvents and vegetable oils. Absent. Dimethylpolysiloxane or amino-modified silicone or polyether-modified silicone having a viscosity of 100 cst or more has little change in physical properties depending on the operating temperature range of asphalt, and there is no problem of volatility compared with petroleum-based and vegetable oil-based release agents. Absent. In addition, since dimethylsiloxane, amino-modified silicone and polyether-modified silicone have a stable chemical structure in the asphalt usage area, their compatibility with asphalt is less changed than conventional petroleum-based and vegetable oil-based release agents. It has an excellent peeling effect on asphalt.

In general, the temperature of asphalt used for asphalt pavement is generally 100 ° C. or higher, and in some cases, the asphalt unloading temperature to a truck may be 150 ° C. or higher. For such high-temperature asphalt, conventional petroleum-based release agents such as light oil and vegetable oil-based release agents have a tendency to remarkably increase in volatility when the temperature is 100 ° C or higher. No longer available. In addition, conventional petroleum-based release agents and vegetable oil-based release agents that have similar chemical structures to asphalt have higher compatibility with asphalt than silicone oil, and tend to show higher compatibility at high temperatures. Asphalt dissolves. For this reason, it is difficult to apply these in advance to obtain an asphalt adhesion preventing effect.

The anti-adhesion agent of the present invention includes phenylmethylsiloxane, hydroxymethylpolysiloxane, alkoxymethylpolysiloxane, alkyl-modified polysiloxane, allylaralkyl-modified polysiloxane, a liquid silicone resin having a three-dimensional structure, and a part thereof. A liquid silicone resin containing a substituent or a high-viscosity silicone composed of one or more of oligomers thereof can be contained. Specifically, (a) phenylmethylpolysiloxane in which a part of a methyl group is substituted by a phenyl group (b) hydroxymethylpolysiloxane in which a part of a methyl group is substituted by a hydroxyl group (c) a part of a methyl group Is an alkoxymethylpolysiloxane substituted with an alkoxy group, and (d) a structure in which a part of a methyl group is partially cross-linked with an allyl aralkyl-modified polysiloxane (e) siloxane substituted with an alkyl group. (F) a liquid silicone resin partially containing the above substituent or an oligomer; (g) a mixture of two or more of these compounds.

These compounds are used together with the polydimethylsiloxane, amino-modified silicone, and polyether-modified silicone of the present invention, taking advantage of their respective properties. For example, phenylmethylsiloxane and allylaralkyl-modified polysiloxane have good compatibility with petroleum-based solvents. Therefore, when the anti-adhesion agent of the present invention is used after being diluted with petroleum-based solvents, it is effective as a dissolution accelerating aid. is there. For example, hydroxymethylsiloxane, alkoxymethylpolysiloxane, a liquid silicone resin having a structure in which a part of siloxane is three-dimensionally crosslinked, a liquid silicone resin partially containing the above substituent, and the like are included in the anti-adhesion agent of the present invention. By doing so, the adhesion to the coated surface is improved, an excellent coating film is formed, and excellent effects such as persistence of the peeling effect, weather resistance and chemical resistance are exhibited.

The anti-adhesion agent of the present invention may use a high-viscosity silicone oil alone, or may be a mixture of the high-viscosity silicone oil diluted with an organic solvent or a low-viscosity silicone oil. . Low viscosity silicone oil is 10 for dimethylpolysiloxane.
It refers to a liquid compound of less than 100 cst and less than 100 cst in the case of amino-modified silicone. When the high-viscosity silicone oil of the present invention is contained in a predetermined concentration range, the effect of preventing adhesion to asphalt can be obtained.

The anti-adhesion agent of the present invention can be used in the form of an aqueous emulsion obtained by emulsifying the above high-viscosity silicone oil with a surfactant. The surfactant is not particularly limited as long as it can emulsify the high-viscosity silicone oil. Preferably, storage at normal temperature is good, and it is often destroyed in the temperature range of use, for example, from room temperature to 100 ° C. The form of the emulsion is o /
Any type of w (oil-in-water) w / o (water-in-oil) may be used. The emulsion type anti-adhesion agent exerts its anti-adhesion effect by rapidly breaking the emulsion by the heat of the asphalt at high temperature and spreading and adhering the silicone oil contained in the emulsion particles to the asphalt surface. Compared with the conventional petroleum solvent-based release agent, the emulsion-type release agent is given more consideration to the effect on the environment, the health of workers, and the improvement of safety by non-flammability.

The high-viscosity silicone oil contained in the antiadhesive agent of the present invention exerts its effect even in a small amount, but if its concentration is high, an excellent peeling effect can be obtained even if the amount of the antiadhesive agent is small. However, when the content of the high-viscosity silicone oil is large, the viscosity of the anti-adhesion agent increases, and the workability decreases. On the other hand, when the content of the high-viscosity silicone oil is small, the viscosity of the anti-adhesion agent is lowered and the workability is improved, but the peeling effect is reduced, so that it is necessary to use a large amount. From the above, the amount of the high-viscosity silicone oil contained in the anti-adhesion agent of the present invention is usually preferably 1 to 50% by weight. Normally, in order to apply the anti-adhesion agent on the actual site, its viscosity is adjusted in consideration of workability. High viscosity makes it difficult to work. Therefore, the silicone oil is diluted with a diluent such as a petroleum-based solvent, a vegetable-oil-based solvent, a synthetic oil, a low-viscosity silicone oil while containing the high-viscosity silicone oil in an amount of 1 to 50% by weight. It is desirable to adjust the viscosity to 300 cst or less.

[0019]

EXAMPLES Example 1 25.degree. C. kinematic viscosity 100,000 cst (product name: AK100,
000 (Wacker Chemical Co., Germany) diluted with a light oil of a stock solution of an anti-adhesive agent containing dimethylpolysiloxane (dimethylpolysiloxane content 12% by weight, viscosity of anti-adhesive agent 250 cst), and used as a truck bed After coating the entire surface, the asphalt mixture was loaded, and after 50 minutes of running, the load was unloaded (loading time 90
Minutes), the state of the bed was observed. Instead of this anti-adhesion agent, a low-viscosity silicone oil (viscosity 200 cst)
A similar test was also conducted for an example using a release agent containing 100% by weight of, and an example using light oil. The test date was January 19, 1998, and the temperature during the test was 1 to 8
At C, the loading platform is 5300 mm long, 2200 mm wide, and 52 deep
It was 0 mm. The results are shown in schematic diagrams 1 to 3. Asphalt did not adhere at all to those using the anti-adhesion agent of the present invention (FIG. 1). On the other hand, in the case of using the low-viscosity silicone oil and the case of using the light oil, asphalt adhered to the state shown in FIGS. 2 and 3 (see the hatched portions in both figures). After these adhered residual asphalts were solidified, the stripping operation was extremely difficult and could not be completely stripped.

Example 2 A kinematic viscosity at 25 ° C. of 20.000 cst (product name: AK20.00
0 A stock solution of an anti-adhesion agent containing dimethylpolysiloxane (Wacker Chemical Co., Germany) diluted with light oil (dimethylpolysiloxane content 25% by weight, anti-adhesion agent viscosity 200 cst) was used as a tire roller. After the application and asphalt compaction, the slip resistance value of the asphalt surface immediately after the construction and two days after the construction was measured. The results are shown in Tables 1 and 2.

[Table 1]

[Table 2] As can be seen from Table 1 showing the results immediately after the construction, when the anti-adhesion agent of the present invention was used, the sliding resistance value was 60 BPN or more in all cases except one of the five sites. Two days after the construction, as shown in Table 2, the sliding resistance value was 65 BPN or more at any of the five points. According to the pavement construction specification standards of the Highway Public Corporation or the local government, the slip resistance value of the pavement after the pavement is required to be 60 BPN or more. The anti-adhesion agent according to the present invention can be used immediately after construction and in 2
It can be seen that the request is satisfied at any point after the day.

Example 3 In order to reproduce a test at a construction site, a test was performed in a laboratory by the following evaluation method. Here, the frictional force corresponds to the slip resistance value of the asphalt surface at the construction site, and the peeling force corresponds to the adhesion of the asphalt to the truck bed. That is, when the frictional force is low, the slip resistance value of the asphalt surface after compaction by the tire roller at the construction site becomes low, which causes a problem. Conversely, if the peeling force is high, the adhesion will increase, and asphalt will adhere to the truck bed or the like.

Evaluation conditions Evaluation Apparatus In the experimental apparatus shown in FIG. 4, when a spring-like steel wire is pulled in the direction of the arrow at a constant speed (V), the force (F) applied to the wire is gradually increased and the sample (M) is increased by a certain force (F1).
Peels off from the base. Thereafter, the sample slides on the substrate with almost constant frictional force (F2). This is shown graphically in FIG. 2. Preparation of Sample As the asphalt, a commercially available drainable asphalt binder was used. First, 2 g of an evaluation sample was uniformly applied to the surface of a steel plate. Next, 3.9 g of asphalt was melted at 180 ° C., poured into a circular ring-shaped mold placed on a φ2.5 mm substrate, and allowed to stand until the asphalt was cooled and hardened to 50 ° C. or less. Thereafter, the wire attached to the circular mold was pulled at a speed of 1 cm / sec, and the force applied at that time was detected to determine F1 and F2.

Formulation Example 1 100 parts by weight of a high-viscosity dimethylpolysiloxane having a kinematic viscosity at 25 ° C. of about 10,000 cst (product name: AK 10,000, Wacker Chemical Co., Germany) Formulation Example 2 A kinematic viscosity at 25 ° C. of about 100,000 cst 100 parts by weight of high-viscosity dimethylpolysiloxane (product name: AK100,000, Wacker Chemical Company, Germany) Formulation Example 3 Amino-modified silicone having a kinematic viscosity at 25 ° C. of about 100 cst (product name: L656, Wacker Chemical Company, Germany) 10
0 parts by weight Formulation Example 4 100 parts by weight of an amino-modified silicone having a kinematic viscosity at 25 ° C. of about 1500 cst (product name WT1650, Wacker Chemical Co., Germany) Formulation Example 5 Polyether-modified silicone having a kinematic viscosity at 25 ° C. of about 200 cst (product name) L050 German Wacker Chemical Co., Ltd.) 100 parts by weight Formulation Example 6 100 parts by weight of a polyether-modified silicone having a kinematic viscosity at 25 ° C. of about 800 cst (product name L051 German Wacker Chemical Company) Formulation Example 7 A kinematic viscosity at 25 ° C. of about 10 25 parts by weight of high viscosity dimethylpolysiloxane of 2,000 cst (product name: AK 10,000, Wacker Chemical Co., Germany) and 75 parts by weight of gas oil Formulation Example 8 High viscosity dimethylpolysiloxane of kinematic viscosity at 25 ° C. of about 100,000 cst (product name) AK10,0000 German Wacker Chemical Company) 25 parts by weight and light oil 5 parts by weight Formulation Example 9 25 kinematic viscosity ℃ about 100cst amino-modified silicone (trade name L656 Germany Wacker Chemical Company) 25
Part by weight and 75 parts by weight of light oil Formulation Example 10 25 parts by weight of an amino-modified silicone (product name WT1650, Wacker Chemical Co., Germany) having a kinematic viscosity at 25 ° C. of about 1500 cst and 75 parts by weight of light oil Formulation Example 11 A kinematic viscosity at 25 ° C. 25 parts by weight of 200 cst polyether-modified silicone (product name L050, Wacker Chemical Company, Germany) Formulation Example 12 25 parts by weight of polyether-modified silicone having a kinematic viscosity at 25 ° C. of about 800 cst (product name L051, Wacker Chemical Company, Germany)

Comparative Example 1 100 parts by weight of light oil Comparative Example 2 100 parts by weight of a high-viscosity dimethylpolysiloxane having a kinematic viscosity at 25 ° C. of about 100 cst (product name: AK100, Wacker Chemical Co., Germany) Comparative Example 3 Kinematic viscosity at 25 ° C. 25 parts by weight of 100 cst high-viscosity dimethylpolysiloxane (product name: AK100, German Wacker Chemical Company) and 75 parts by weight of light oil The evaluation results are shown in the following table.

[Table 3]

From the above results, the use of the compound of the present invention prevents asphalt from adhering to the truck bed.
In addition, it is possible to supply a safe material that has a high slip resistance value on the asphalt surface after construction and meets pavement standards of the Highway Public Corporation.

[0026]

Since the present invention contains silicone oil having a predetermined viscosity, it exhibits an excellent adhesion preventing effect not only on ordinary asphalt but also on high-viscosity asphalt such as drainage asphalt. In addition, by applying the anti-adhesion agent of the present invention in advance to a bed of an asphalt transport truck or a roller for compaction in pavement work, asphalt is prevented from adhering to these working equipment, thereby improving workability. Can be improved. Moreover, the anti-adhesion agent of the present invention can maintain a high slip resistance value of the asphalt pavement surface after the completion of the construction, and can form a pavement road having a favorable road surface condition.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an asphalt adhesion state of a truck bed when an anti-adhesion agent of the present invention is used in Example 1.

FIG. 2 is a schematic diagram showing an asphalt adhesion state of a truck bed when low-viscosity silicone oil is used in Example 1.

FIG. 3 is a schematic diagram showing an asphalt adhesion state of a truck bed when light oil according to a conventional example is used in the first embodiment.

FIG. 4 is an explanatory view of an apparatus used in an experimental example.

FIG. 5 is a graph showing the state of the experiment in FIG. 4;

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Noboru Sudo 2-14-1, Nishi-Waseda, Shinjuku-ku, Tokyo Wacker Chemicals East Asia Stock Company In-house (72) Inventor Tadahiro Okabe 2--14, Nishi-Waseda, Shinjuku-ku, Tokyo No. 1 Wacker Chemicals East Asia Stock Company In-house (72) Inventor Eigoro Nagamine 2-12-5 Kyohei, Sumida-ku, Tokyo Dai-ichi Shoji Co., Ltd.

Claims (8)

[Claims] 1. An asphalt adhesion inhibitor containing a high-viscosity silicone oil, wherein the asphalt adhesion inhibitor has a sliding resistance value of 60 BPN or more on an asphalt pavement surface after compaction by a compaction roller. 2. The asphalt adhesion inhibitor according to claim 1, wherein said high-viscosity silicone oil is a polydimethylsiloxane having a kinematic viscosity at 25 ° C. of 1,000 cst or more, and contains 1 to 50 parts by weight of said polydimethylsiloxane. 3. The high-viscosity silicone oil is an amino-modified silicone having a kinematic viscosity at 25 ° C. of 100 cst or more.
The asphalt adhesion inhibitor according to claim 1. 4. The asphalt adhesion inhibitor according to claim 1, wherein the high viscosity silicone oil is a polyether-modified silicone having a kinematic viscosity at 25 ° C. of 100 cst or more. 5. A phenylmethylsiloxane, a hydroxymethylpolysiloxane, an alkoxymethylpolysiloxane, an alkyl-modified polysiloxane, an allylaralkyl-modified polysiloxane, a liquid silicone resin having a three-dimensional structure, and a liquid silicone resin partially containing the above substituent. The asphalt adhesion inhibitor according to any one of claims 2 to 4, further comprising a high-viscosity silicone comprising one or more oligomers thereof. 6. The method according to claim 1, wherein the total kinematic viscosity after dilution is adjusted to 300 cst or less, and at least one or more of the silicone oils according to any one of claims 2 to 4 is contained. Asphalt adhesion inhibitor. 7. A method for preventing asphalt adhesion by applying the silicone oil according to any one of claims 1 to 6 to a pavement working machine or a transport truck bed. 8. The method as claimed in claim 7, wherein said asphalt is drainable asphalt.