JPH05295273A - Asphalt block copolymer resin composition - Google Patents

Abstract

PURPOSE:To obtain the subject composition useful as a material for pavement of road, etc., having excellent solubility, flowing resistance, cracking resistance, water resistance and adhesiveness by adding a given amount of a specific block copolymer resin to asphalt. CONSTITUTION:(A) 100 pts.wt. asphalt such as a straight asphalt is blended with (B) 3-50 pts.wt. mixture produced by mixing 100 pts.wt. block copolymer resin such as styrene-butadiene block copolymer resin, 20-200 pts.wt. heavy oil such as lubricant, 20-200 pts.wt. aromatic hydrocarbon resin such as terpene resin to give the objective composition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an asphalt / block copolymer resin composition, which can be used as a structure and a road paving material when mixed with an aggregate.

[0002]

[Problems of the prior art] Conventionally, a composition obtained by mixing an asphalt with an aggregate has been widely used as a road paving material, a roofing material, a sealing material, a covering material, etc. It is an effective use of the basic characteristics of bituminous matter, which are excellent in properties, solidify at room temperature or low temperature, have a binding force, exhibit strength, and are inexpensive. However, on the other hand, these basic characteristics of bituminous materials were also defects of bituminous materials. That is, since asphalt has a large temperature dependency, there is a problem that deformation due to plastic flow is likely to occur at high temperatures in summer, cracking due to hardening occurs in winter, and wear due to traffic such as tire chains is severe. Further, generally, since the adhesive strength at the joint surface between the aggregate and the asphalt is weak, there is a tendency that the asphalt is easily separated from the aggregate due to the influence of water. Therefore, in order to solve these problems, thermoplastic resins such as ethylene vinyl acetate copolymer, polyethylene, and ethylene / ethyl acrylate copolymer, or rubber such as styrene / butadiene rubber and chloroprene rubber are used alone or in combination. It has been dealt with by the technical means of improving the bituminous quality by adding it to the bituminous quality. However, the modifying effect by these means cannot be said to be sufficient, and for example, in the case of using the thermoplastic resin, there is a drawback that the compatibility of the asphalt is enhanced, but the compatibility, intermediary ability, adhesiveness, etc. are lacking. In addition, when the rubber was added, the viscosity of asphalt suddenly increased when the content was high, so the content could not be increased so much, so that the softening point and heat resistance could not be improved so much. However, there are some problems such as lack of compatibility. Therefore,
In recent years, as a substitute for these, a composition comprising an asphalt / block copolymer has been studied, and considerable results have been recognized. However, another problem to this is a block copolymer resin. Is not always easy to mix with asphalt, and in order to completely dissolve the block copolymer resin in asphalt, it is necessary to maintain a heating and stirring state for at least 5 hours or more. Premix equipment was needed.

[0003]

SUMMARY OF THE INVENTION However, as a result of intensive studies in view of the above points, the present inventors have found that when a block copolymer resin is mixed with asphalt, a predetermined block copolymer resin is used. Heavy oil and aromatic hydrocarbon resin, which have been subjected to a certain amount of treatment, have excellent compatibility with asphalt, and those that have been mixed with asphalt have excellent workability. The present invention has been completed based on the finding that it is excellent in water resistance, flexibility under low temperature, plastic deformation resistance under high temperature, and adhesiveness. Here, the block copolymer resin contains one or more polymer blocks mainly composed of a vinyl aromatic compound, and one or more blocks mainly composed of a conjugated diene compound, but specifically, S. B. S
(Styrene, butadiene, styrene), S.I. I. S (styrene, isoprene, styrene), S.I. E. B. S (styrene, ethylene butadiene, styrene) and the like.
Asphalt includes straight asphalt, natural asphalt, semi-blown asphalt, blown asphalt, petroleum resin binders for color paving, and similar materials, but is generally straight asphalt. Heavy oil refers to vegetable oils such as rice bran oil and soybean oil,
It refers to animal oils such as fish oil and whale oil, and heavy petroleum hydrocarbon oils such as cylinder oils and lubricating oils. From the viewpoint of economy, it is preferable to use heavy petroleum hydrocarbon oils, especially aromatic process oils. The aromatic hydrocarbon resin refers to a resin composed of rosin and its derivative, terpene resin, petroleum resin and its derivative, coumarone indene resin, alkylphenol resin, alkyd resin and the like. The block copolymer resin is made of heavy oil and the aromatic hydrocarbon resin is made of
What has been subjected to a certain treatment means one obtained by adding a heavy oil and an aromatic hydrocarbon resin to a block copolymer resin and mixing them under heating to form a uniform composition. Such a blending ratio means that the heavy oil is 20 to 200 parts by weight and the aromatic hydrocarbon resin is 20 to 200 parts by weight with respect to 100 parts by weight of the block copolymer resin. If necessary, a dispersant such as glycerin fatty acid ester, sorbitan alkyl ester, polyoxyethylene alkyl amide and the like can be used. If the compounded amount is out of this range, the solubility in asphalt may be significantly impaired, the asphalt may be significantly softened, or the asphalt may become brittle. By the way, the composition may be mixed according to a conventional method, but it is usually heated and stirred at 150 ° C. or higher and 200 ° C. or lower in an atmosphere of an inert gas such as nitrogen or in the air. The mixing time of the composition may be about 15 minutes to 30 minutes. When the composition is processed into a predetermined shape, it can be pelletized, plate-shaped, string-shaped, or block-shaped by using a screw feeder, an extruder, a pelletizer, or the like. By the way, it is desirable that the size is 10 mm or less. On the other hand, in order to prepare the asphalt / block copolymer resin composition by blending the composition with asphalt, the blending ratio of the composition is 3 to 50 parts by weight, more preferably 100 parts by weight of the asphalt. 1
It is preferably in the range of 0 to 40 parts by weight. That is, if the amount is less than this range, the effect of modifying the asphalt is substantially not recognized, and if the amount is more than this range, workability is significantly impaired and economically significant. It will be disadvantageous. By the way, in a method for producing an asphalt / block copolymer resin composition using such a composition,
This is roughly divided into a premix method in which a composition related to pre-processed and melted asphalt is added to produce a modified asphalt, and in a mixing process of an asphalt plant, the composition is added to modify the asphalt. Although there is a plant mix method for producing, a plant mix method is preferable as a method for more effectively utilizing the features of the present invention.

[0004]

EXAMPLE 1 The present invention will be described in more detail below with reference to examples. Styrene-butadiene block copolymer resin (styrene content 31%, butadiene part vinyl content 12%, molecular weight 3
80,000, ZEOFLT-1200 Nippon Zeon),
Heavy oil (Diana Brothes Oil AE-50 Idemitsu Petroleum) and petroleum resin (Petocol 130 Toyo Soda) were mixed in different proportions, and heated and mixed at 200 ° C for 30 minutes in the atmosphere to dissolve sufficiently. To cool 10
It was made into a mm-square die. Add this to 60/80 straight asphalt heated to 150-160 ° C,
The dissolution time when the asphalt / block copolymer resin composition was prepared was measured. The results are shown in Table-1.
In addition, as a comparative example, the same styrene-butadiene block copolymer resin alone and the case where each of the above materials are separately added to the asphalt are also shown in the same table.

[0005]

[Table-1] As can be seen from Table-1, the styrene-butadiene block copolymer resin composition according to the present invention is composed of a styrene-butadiene block copolymer resin alone of Comparative Example and a composition obtained by separately adding each of the above materials to asphalt. In comparison, it shows that it dissolves in asphalt in a short time.

[0006]

Example 2 As in Example 1, an asphalt / block copolymer resin composition according to the present invention was prepared and tested for its various physical properties. The results are shown in Table-2.
As comparative examples, 60/80 straight asphalt with SBR rubber as a rubber system and EEA resin as a resin system are shown in the table.

[0007]

[Table-2] As can be seen from Table-2, the 60 ° C. absolute viscosity as an index of the fluidity resistance of the binder is 4390 poise for the rubber type and 10790 poise for the resin type, but the one according to the present invention is extremely high at 200,000 poise or more. It can be seen that it has extremely high viscosity and is extremely excellent in flow resistance. Also, the grasping power of the binder for the aggregate,
The toughness and tenacity as indicators of the adhesive strength are rubber-based, but the toughness is 59 kg / cm and the tenacity is 22.
kg · cm, the resin system has a toughness of 93 kg · cm and a tenacity of 13 kg · cm, but those of the present invention have a toughness of 204 to 332 kg · cm and a tenacity of 165.
The value is 270 kg · cm, which is extremely large, and it can be seen that the gripping force and the adhesive force to the aggregate are extremely excellent. On the other hand, the viscosity as an index of workability of the binder is 300 centipoise when kneading and 300 when pouring.
When viewed as 0 centipoise, it can be seen that the product according to the present invention satisfies these conditions and is excellent in workability.

[0008]

EFFECTS OF THE INVENTION According to the method of the present invention, not only is a block copolymer resin composition excellent in solubility in asphalt obtained by a simple production method, but this is added to asphalt. As a result, the effect of significantly improving the fluidity resistance, crack resistance, water resistance, adhesiveness, etc. of the asphalt is exhibited.

Claims (1)

[Claims] 1. When mixing a block copolymer resin with asphalt, 100 parts by weight of the block copolymer resin is used in advance with 20 to 200 parts by weight of heavy oil and 20 to 200 parts by weight of an aromatic hydrocarbon resin. An asphalt / block copolymer resin composition, characterized in that 3 to 50 parts by weight of 100 parts by weight of asphalt are added after a certain treatment.