JP2542309B2 - Asphalt / block copolymer resin composition - Google Patents

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 or 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 substances, which are rich in properties, solidify at room temperature or low temperature, have binding strength, exhibit strength, and are inexpensive. However, on the other hand, these basic characteristics of bituminous materials were also the drawbacks 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 temperature 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. This 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 compatibility of the asphalt is enhanced, but lack of compatibility, adhesiveness, etc. 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 improvement in softening point and heat resistance could not be expected so much. However, there are some problems such as lack of compatibility. Therefore,
In recent years, as an alternative to 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. It 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 at low temperature, plastic deformation resistance at high temperature, and adhesiveness. Here, the block copolymer resin contains at least one polymer block mainly composed of a vinyl aromatic compound, and at least one block 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. FIG. 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, but it is preferable to use heavy petroleum hydrocarbon oils, especially aromatic process oils in view of economy. 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 amount of treatment is a block copolymer resin to which a heavy oil and an aromatic hydrocarbon resin have been added and mixed under heating to form a uniform composition. The blending ratio is such 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, which is not preferable. 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 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 mix the composition with asphalt to produce an asphalt / block copolymer resin composition, the composition ratio 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 blending amount is less than this range, the effect of modifying the asphalt is substantially not recognized, and if the blending amount exceeds this range, the workability is significantly impaired, and the economy is also significantly increased. It will be disadvantageous. By the way, in the method for producing an asphalt / block copolymer resin composition using such a composition,
This is roughly divided into a premix method of producing a modified asphalt by adding the composition related to the pre-processed and melted asphalt, and a modified asphalt by adding the composition during the mixing process of the asphalt plant. Although there is a plant mix method for manufacturing, 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 at different ratios, 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.
The same table also shows, as a comparative example, a styrene-butadiene block copolymer resin alone and a case where each of the above materials is separately added to asphalt.

[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 the styrene-butadiene block copolymer resin of Comparative Example alone and the above-mentioned materials separately added 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 tests were carried out according to its 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 rubber type and 10790 poise for resin type, but the one according to the present invention is as high as 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,
Toughness and tenacity as indicators of adhesive strength are rubber-based toughness 59 kg / cm, tenacity 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 with respect to the aggregate are extremely excellent. On the other hand, when viscosity is used as an index of workability of the binder, 300 centipoise at kneading and 300 at the time of compaction
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]

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

Claims (1)

(57) [Claims] 1. When mixing a block copolymer resin with asphalt, 100 parts by weight of the block copolymer resin is mixed with 20 to 200 parts by weight of heavy oil and 20 to 200 parts by weight of an aromatic hydrocarbon resin. 3 to 100 parts by weight of asphalt with certain treatment
Plant mix characterized by adding 50 parts by weight
System asphalt block copolymer resin composition