JP2006022274A - Blown asphalt for waterproofing work and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide blown asphalt pertinent to waterproofing work excellent in workability and storability, by suppressing odor and smoke arising at heating and melting the blown asphalt for waterproofing work at a high temperature. <P>SOLUTION: This blown asphalt for waterproofing work is characterized by having a softening point of 100-120°C, a needle penetration degree of 25-35, oil exudation of ≤3, folding resistance at a low temperature of ≤1°C, a temperature at which viscosity becomes 100 mPa×s of ≤220°C, and a temperature at which viscosity becomes 60 mPa×s of ≤240°C. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to blown asphalt for waterproofing work and a method for producing the same, and more particularly, suitable for waterproof work that suppresses generation of odor and smoke when blown asphalt for waterproofing work is heated and melted at high temperature and has excellent workability. It is about blown asphalt.

The blown asphalt for waterproofing work is classified into 1 type to 4 types according to the Japanese Industrial Standard (JIS K 2207), and 3 types are the most widely used. Although these production methods are not particularly specified, generally, a vacuum distillation residue oil (vacuum residue) of petroleum is appropriately combined with a vacuum distillation distillate as a raw material, and 200 ° C. to 300 ° C. using a blown asphalt production apparatus. It is manufactured by blowing air under the temperature of This air blowing step is called blowing, and when a catalyst is added to the raw material and blowing is called a catalyst blow. The blown asphalt manufactured in this way naturally passes the JIS standard, but it is not enough for the user to satisfy the standard items, and the practical performance that is not in the standard is regarded as important. (For example, refer to Patent Document 1).
Furthermore, recently, in a waterproof construction site using blown asphalt, it has been required to deal with the problem of smoke and odor generated during the process of heating and melting.
In general, the viscosity of blown asphalt used for waterproofing work is often in the range of 60 mPa · s to 100 mPa · s. To obtain this viscosity range, blown asphalt is often heated to about 280 ° C. The reality is that they are forced to do so.
JP 2000-053866 A

The blown asphalt for waterproofing work manufactured as above is transported to a roofing factory etc. in a heated and melted state as it is and processed into asphalt roofing, etc., or it is cooled and solidified after filling into a paper bag etc. At that time, it is heated and melted again. When blown asphalt is secondary processed, it is necessary to heat it to a viscosity suitable for processing, but as the temperature rises, relatively light components contained in blown asphalt will evaporate, causing smoke and odor Be perceived.
There is no problem if equipment that can absorb and remove such light components is used, but for example, when asphalt waterproofing work is performed on the rooftop of an apartment, etc., bonding with a simple equipment such as asphalt kettle is required to bond asphalt roofing. The blown asphalt is heated up to about 280 ℃, but in this state, the amount of smoke and odor increases, and there are many cases that inconvenience residents living in condominiums. Is strongly demanded.

  As a result of intensive studies to solve the above problems, the present inventors have determined that the softening point, the penetration, the oil bleeding property, the low temperature bending property, and the temperature at which the viscosity is 100 mPa · s and 60 mPa · s are predetermined. It has been found that the blown asphalt having the properties as described above becomes a blown asphalt for waterproofing work which suppresses generation of odor and smoke when heated and melted at a high temperature and is excellent in workability, thereby completing the present invention.

That is, in the present invention, the softening point is 100 to 120 ° C., the penetration is 25 to 35, the oil bleeding property is 3 or less, the low temperature bending property is 1 ° C. or less, and the temperature at which the viscosity is 100 mPa · s is 220 ° C. or less. The viscosity is 60 mPa.s. The present invention relates to a blown asphalt for waterproofing, characterized in that the temperature at which s is 240 ° C. or lower.
Further, according to the present invention, the flash point is 280 ° C. or more, the flash embrittlement point is −15 ° C. or less, the droop length is 8 mm or less, and the droop length after the heat stability test at 250 ° C. is 15 mm or less. The blown asphalt for waterproofing construction as described above.

The present invention also relates to the blown asphalt for waterproofing construction described above, wherein the blown asphalt for waterproofing work is obtained by heating and mixing a wax to a blown asphalt obtained by blowing a mixture of vacuum residue and mineral oil.
The present invention also relates to the above-described blown asphalt for waterproofing work, which is obtained by blowing a mixture of vacuum residue, mineral oil and wax.

Moreover, this invention mix | blends and heat-mixes 3-10 mass parts of wax with respect to 100 mass parts of blown asphalt obtained by blowing the mixture of 70-83 mass% of vacuum residual oil, and 17-30 mass% of mineral oil. A method for producing blown asphalt for waterproofing construction as described above.
Further, according to the present invention, the waterproof construction described above is characterized in that 3 to 10 parts by mass of wax is blended and blown with respect to 100 parts by mass of a mixture of 70 to 83% by mass of residual vacuum and 17 to 30% by mass of mineral oil. The present invention relates to a method for producing blown asphalt.

Hereinafter, the present invention will be described in detail.
The softening point of the blown asphalt for waterproofing work of the present invention (hereinafter also referred to as the blown asphalt of the present invention) needs to be 100 ° C. or higher, preferably 110 ° C. or higher, more preferably 115 ° C. or higher. If the softening point is too low, it is not preferable because dripping is likely to occur and cause water leakage, and handleability and workability are deteriorated. Therefore, a higher softening point is desirable, but if it is too high, the melting temperature becomes high, which makes it difficult to perform the construction, so the upper limit must be 120 ° C. or less.
The softening point here is a value measured according to JIS K 2207 “Petroleum Asphalt—Softening Point Test Method”.

The penetration of the blown asphalt of the present invention needs to be 25-35. If the penetration is too low, the elasticity is deteriorated and cracking tends to occur. Therefore, 27 or more is preferable, and 28 or more is more preferable. On the other hand, if the penetration is too high, it will be too soft and will be prone to dripping, so 34 or less is preferred, and 33 or less is more preferred.
The penetration here refers to a penetration (1/10 mm) at 25 ° C. measured by JIS K 2207 “Petroleum Asphalt—Penetration Test Method”.

The oil penetration of the blown asphalt of the present invention is required to be 3 or less, preferably 2 or less, and more preferably 1 or less. Oil bleed refers to a phenomenon in which oil in asphalt oozes onto the roofing surface when the roofing product is stored in a warehouse after manufacturing in the summer when the temperature is high. If oil oozes out, it may cause contamination, such as the roofing color becoming darker over time.
The oil spillability referred to here means that 5 g of a sample is collected in a container having a surface area of 12.6 cm ² , 10 type sheets processed to an appropriate size are stacked on top of the sample, and a load of 100 g is applied, and 60 ° C. This refers to the number of sheets of oil that oozes out after standing for 120 hours in an air thermostat.

The low temperature bendability of the blown asphalt of the present invention needs to be 1 ° C. or less, preferably 0 ° C. or less, and more preferably −1 ° C. or less. In winter, when winding and using a roofing product in the form of a roll, it can be seen that cracks occur near the core or cracks due to shrinkage after construction. This is due to the problem of flexibility at low temperatures. Moreover, since the cracked roofing product directly causes water leakage, it is preferable that the low temperature bendability (folding resistance), which is an index of ease of bending at low temperatures, is low.
In addition, the low temperature bendability here was measured based on "bending performance" prescribed | regulated to JISA6013 "modified asphalt roofing sheet". That is, a three-point bending test is performed with a support roller having a diameter of 22 cm and a mandrel in a mixed solution of ethanol and water (70:30) (specimen dimensions are a length of 100 mm, a width of 40 mm, and a thickness of 1 mm). From the results of the three-point bending test, the lowest temperature at which bending is possible was defined as the low temperature bending property (folding temperature).

The blown asphalt of the present invention requires that the temperature at which the viscosity is 100 mPa · s is 220 ° C. or lower and the temperature at which the viscosity is 60 mPa · s is 240 ° C. or lower. Usually, it is said that the blown asphalt has a viscosity of 60 to 100 mPa · s that is easy to use in construction, and the temperature for achieving this viscosity is important. In general, the lower the viscosity at high temperature, the lower the temperature, and the lower the resulting smoke and odor. In view of the above, if the temperature at which the viscosity becomes 100 mPa · s and the temperature at which the viscosity becomes 60 mPa · s are too high, the handling and work hazards increase due to the heating and melting temperature during construction, and smoke and odor This is not desirable because the occurrence of this could have an impact on the health of construction workers and residents in the vicinity. Therefore, the temperature at which the viscosity is 100 mPa · s is preferably 215 ° C. or lower. The temperature at which the viscosity is 60 mPa · s is preferably 230 ° C. or lower.
Here, the temperature at a viscosity of 100 mPa · s and the temperature at a viscosity of 60 mPa · s are different from those measured based on the Petroleum Institute method JPI-5S-54-99 “viscosity test method using asphalt-rotary viscometer”. It means a value obtained by preparing a viscosity-temperature chart from the viscosity at two or more temperatures and reading the temperatures corresponding to the viscosity of 100 mPa · s and the viscosity of 60 mPa · s.

If the flash point of the blown asphalt of the present invention is too low, there is a risk of ignition when it is melted by heating. Therefore, it is preferably 280 ° C or higher, more preferably 300 ° C or higher, and further preferably 320 ° C or higher.
The flash point here is a value measured by JIS K 2265 “Crude oil and petroleum products—flash point test method—Cleveland open flash point test method”.

The blaze embrittlement point of the blown asphalt of the present invention is preferably −15 ° C. or lower, more preferably −17 ° C. or lower, and −19 ° C. or lower, because if it is too high, it becomes brittle in a low temperature environment and deteriorates durability. Further preferred.
In addition, the said flatness embrittlement point here is a value measured by JISK2207 "Petroleum asphalt-fuller embrittlement point test method".

The drool length of the blown asphalt of the present invention is preferably 8 mm or less, more preferably 6 mm or less, and further preferably 5 mm or less from the viewpoint of preventing water leakage due to the rising portion after the roofing material is attached. preferable.
Here, the avalanche length refers to the avalanche length at 70 ° C. measured according to JIS K 2207 “Petroleum Asphalt—Avalanche Length Test Method”.

The drool length after the heat stability test at 250 ° C. of the blown asphalt of the present invention is not preferable because it causes not only a deterioration in handleability and workability but also a cause of water leakage. 12 mm or less is more preferable.
Here, the heat stability test at 250 ° C. is based on JIS K 2207 “Petroleum Asphalt—Heating Stability Test Method”, but the heating temperature of JIS standard is from 300 ° C. to 250 which is close to the actual heating and melting temperature. Refers to tests performed at a temperature of ℃. The droop length after the heat stability test is a value (mm) obtained by measuring the blown asphalt after completion of the heat stability test at 250 ° C. according to JIS K2207 “Petroleum Asphalt-Droop Length Test Method”. ).

  The blown asphalt of the present invention can be obtained by using a vacuum residue, mineral oil and wax as raw materials. In particular, those obtained by heat-mixing wax to blown asphalt obtained by blowing a mixture of vacuum residue and mineral oil are preferable. Alternatively, those obtained by blowing a mixture of vacuum residue, mineral oil and wax are preferred.

  Although there is no restriction | limiting in particular about the manufacturing method of the blown asphalt of this invention, As a suitable method of satisfying the predetermined | prescribed property in the blown asphalt of this invention, the mixture of 70-83 mass% of vacuum residue and 17-30 mass% of mineral oil 100 parts by weight of blown asphalt obtained by blowing a mixture of 3 to 10 parts by weight of wax and mixing by heating, or 100 parts by weight of a mixture of 70 to 83% by weight of residual vacuum and 17 to 30% by weight of mineral oil On the other hand, a method of blending 3 to 10 parts by mass of wax and blowing can be mentioned.

In the present invention, the reduced-pressure residual oil is a reduced-pressure distillation remaining after the atmospheric distillation apparatus bottom oil (atmospheric distillation residue) obtained after the crude oil is subjected to atmospheric distillation with an atmospheric distillation apparatus is further distilled under reduced pressure with a vacuum distillation apparatus. It means equipment bottom oil. The type of crude oil is not particularly limited, but is naphthenic such as Arabian Heavy, Arabian Medium, Kafuji, Kuwait, Iranian Heavy, Middle Eastern Heavy, Middle or Mixed Oil, Maya Crude, etc. It is desirable to use crude oil. Of these, Arabian heavy crude oil and Kafuji crude oil are preferably used. Moreover, the penetration of the vacuum residue is preferably 200 or less, more preferably 180 or less, and even more preferably 150 or less, from the viewpoint that various properties of the blown asphalt of the present invention can be easily achieved.
Here, the penetration is a value of penetration (1/10 mm) at 25 ° C. measured according to JIS K 2207 “Petroleum Asphalt—Penetration Test Method”.

Although the mineral oil used for this invention is not specifically limited, It is preferable that they are a paraffinic mineral oil, an aromatic mineral oil, and a naphthenic mineral oil. The mineral oil used for producing the blown asphalt of the present invention is preferably a paraffinic mineral oil. Among these, the use of paraffinic mineral oil is particularly preferable in that the polycondensation reaction caused by the bond with oxygen or the like occurring during the blowing reaction can be moderately suppressed, and the low viscosity of the blown asphalt of the present invention can be further promoted.
Paraffinic, aromatic and naphthenic mineral oils are affected by the type of crude oil selected, but the production method is not particularly limited. For example, lubricating oil fraction obtained by subjecting crude oil to atmospheric distillation and vacuum distillation may be subjected to solvent removal, solvent extraction, hydrocracking solvent dewaxing, catalytic dewaxing, hydrorefining, sulfuric acid washing, clay treatment, etc. Fractions purified in combination can be used. In particular, the oil fraction obtained by distilling crude oil under reduced pressure is extracted with a solvent extraction such as furfural extraction using a furfural to remove aromatics and resin in the oil fraction, and liquid propane is used from the oil obtained by distillation under reduced pressure. Solvent dewaxing, such as MEK dewaxing, which removes wax using a solvent such as MEK, and hydrorefining A high-viscosity high-grade lubricating oil component (bright stock) or the like obtained by combining these is preferably used.

  The crude oil used in producing the mineral oil of the present invention is selected according to the type of mineral oil required. For example, Pennsylvania crude oil, Minas crude oil, Daqing crude oil, etc. Crude base oils such as crude oil, foot crude oil, Kuwait crude oil, Lattaway crude oil, Allian crude oil, eosin crude oil, and Solish crude oil can be preferably used.

The wax used in the present invention is not particularly limited, but the polyolefin wax obtained by a production method such as a general polymerization type, a modified type, or a decomposition type, depending on its production method, by Fischer-Tropsch synthesis. Examples thereof include Fischer-Tropsch wax (FT wax) obtained.
The polyolefin wax can be obtained by, for example, a production method in which an olefin monomer is used as a raw material and polymerized with a radical catalyst, a Ziegler-Natta catalyst, a metallocene catalyst, or the like, a method in which a polymer is decomposed, and the like. Typical examples include polyethylene wax and polypropylene wax. Polyolefin waxes are classified into a high density type and a low density type from the structure thereof, and a low density type is suitable from various performance aspects of asphalt, and a number average molecular weight by GPC analysis of about 1000 is more preferable.
The FT wax can be produced, for example, by synthesizing (FT synthesis) carbon monoxide and hydrogen generated by gasification of natural gas or petroleum heavy residual oil using an FT catalyst.

  The method for blowing the mixture of the vacuum residue and mineral oil or the method for blowing the mixture of the vacuum residue, mineral oil and wax is not particularly limited, and a known method can be applied. For example, a blowing temperature of 170 to 300 ° C. and an air blowing amount of 20 to 40 L / hr / Kg are preferably applied. The blowing time depends on the blowing temperature and the amount of air blown and cannot be determined unconditionally, but it is usually preferably 10 to 15 hours.

  The blown asphalt for waterproofing work of the present invention has the same or higher performance as compared with the conventional asphalt for waterproofing work, and in particular, the temperature at which the viscosity is 100 mPa · s and the temperature at which 60 mPa · s is both low are low. Therefore, the heating and melting temperature at the time of construction can be further lowered from the normal use temperature, and odor and smoke generated at the time of construction can be suppressed. In addition, it suppresses oil seepage during summer storage and is excellent in crack prevention performance during winter storage.

  EXAMPLES Next, although an Example and a comparative example demonstrate this invention further more concretely, this invention is not restrict | limited by these examples.

Table 1 shows properties of the vacuum residue and mineral oil used in Examples 1 to 9 and Comparative Examples 1 to 6, and Table 2 shows properties of the wax. In addition, Table 3 shows the ratios of raw material oil blends, properties of blown asphalt, and evaluation results of Examples and Comparative Examples.
In addition, what was shown below was used as a vacuum residue, mineral oil, and wax used by the Example and the comparative example.
(1) Reduced pressure residue Reduced pressure residue A: Straight asphalt 60-80 manufactured by NIPPON NIPPON OIL CO., LTD.
Vacuum residue B: straight asphalt 80-100 made by Nippon Oil Co., Ltd. Negishi Refinery Vacuum residue C: straight asphalt 150-200 made by Mizushima Refinery
(2) Mineral oil Paraffinic mineral oil: N460 manufactured by NIPPON NIPPON OIL CO., LTD.
Aroma-based mineral oil: Comolex 700, manufactured by NIPPON NIPPON OIL CO., LTD.
Naphthenic mineral oil: SHN440 manufactured by Sankyo Oil Chemical Co., Ltd.
(3) Wax Polyolefin wax A: High wax 110P manufactured by Mitsui Chemicals, Inc.
Polyolefin wax B: High wax 420P manufactured by Mitsui Chemicals, Inc.
Polyolefin wax C: High wax 100P manufactured by Mitsui Chemicals, Inc.
Polyolefin wax D: High wax 400P manufactured by Mitsui Chemicals, Inc.
FT wax: Parasol flax wax C80 manufactured by Sazol Wax

Among the properties in Table 1, the density of the residual vacuum, the penetration, the softening point is JIS K2207, the flash point is JIS K2265, the mineral oil density is JIS K2249, the flash point is JIS K2265, and the kinematic viscosity and viscosity index are JIS K2283. , Nd-M analysis was measured by ASTM D-3238-90.
Among the properties in Table 2, the density of wax refers to the density at 23 ° C. measured by JIS K7112 “Plastics—Method B of Measuring Density and Specific Gravity of Non-foamed Plastic (Pycnometer Method)”, and the molecular weight is GPC analysis (gel) The weight average molecular weight (Mw), softening point, and penetration measured by permeation chromatographic analysis are the softening point measured by JIS K2207 and the penetration at 25 ° C.
Among the properties of blown asphalt in Table 3, the softening point, penetration, penetration index, froth embrittlement point, droop length, and heat stability test were all in accordance with JIS K 2207 or JIS K 2207. Measured by the method. The flash point was measured by a method according to JIS K2265, the viscosity was measured according to JPI-5S-54-99, and the temperature corresponding to a specific viscosity was measured according to JPI-5S-54-99.

The evaluation method for blown asphalt described in Table 3 is as follows.
(1) Smoke generation evaluation at melting 2 kg of blown asphalt was heated and melted at 250 ° C., the amount of smoke generated at that time was visually observed, and smoke generation was evaluated according to the following criteria.
・ Smoke generation at a level that is hardly noticed: ○
・ Smoke generation at a slightly smoke level: △
・ Smoke generation at such a level that the background is no longer visible: ×
(2) Odor Evaluation 1 g of blown asphalt sample is placed on a stainless steel plate heated to 250 ° C., and the odor emitted from the sample is 1 with an odor sensor (a portable odor sensor XP-329 type manufactured by New Cosmos Electric Co., Ltd.). The measurement was performed for 1 minute, and the maximum value of the data obtained during that time was compared. The odor improvement effect was determined based on Comparative Example 1. A value smaller than 100% means that there is an odor improving effect than Comparative Example 1, and a value exceeding 100% means that there is no improving effect. The base of the odor sensor was adjusted so that the laboratory atmosphere was 200.
(3) Weather resistance test In accordance with ASTM D1169, a blown asphalt heated on an aluminum plate (150 × 70 × 1 mm) is heated and pressed to a thickness of about 1 mm to prepare a specimen. Next, the specimen was irradiated with light by a sunshine xenon long life weather meter (WEL-6XS-HC manufactured by Suga Test Instruments Co., Ltd., light source: water-cooled xenon long life arc lamp 6.0 kW 1 lamp) (51 minutes) Light irradiation and spraying (9 minutes), spraying temperature: 7 ± 3 ° C., and the time (hr) at which the surface of the specimen was cracked (hr) was measured.
The presence or absence of cracks is confirmed by applying a conducting liquid (water: 93%, ethanol: 5%, sodium chloride: 2%) to the surface of the specimen and measuring the electrical continuity between the conducting liquid and the aluminum plate with a tester. Was done. In addition, the weathering time means that a crack is hard to generate | occur | produce, so that it is long.

Example 1
Reduced residual oil C: 80% by mass and paraffinic mineral oil: 20% by mass of a mixture of blown asphalt obtained by blowing for 9 hours at a reaction temperature of 175 to 245 ° C. and an air blowing rate of 30 L / hr / Kg. On the other hand, 3 parts by mass of polyolefin wax A was heated and mixed at 195 ° C. to obtain blown asphalt. The properties are shown in Table 3.

(Example 2)
100 parts by mass of blown asphalt obtained by blowing a mixture of 75% by mass of vacuum residual oil C: 75% by mass and 25% by mass of paraffinic mineral oil at a reaction temperature of 180 to 250 ° C. and an air blowing rate of 35 L / hr / Kg for 10 hours. On the other hand, 5 parts by mass of polyolefin wax A was heated and mixed at 200 ° C. to obtain blown asphalt. The properties are shown in Table 3.

Example 3
Vacuum blown residue C: 70% by mass and paraffinic mineral oil: 30% by mass A mixture of blown asphalt obtained by blowing for 8 hours at a reaction temperature of 175 to 260 ° C. and an air blowing amount of 30 L / hr / Kg On the other hand, 10 parts by mass of polyolefin wax A was heated and mixed at 200 ° C. to obtain blown asphalt. The properties are shown in Table 3.

Example 4
Vacuum blown residue C: 75% by mass and paraffinic mineral oil: 25% by mass A mixture of blown asphalt obtained by blowing for 12 hours at a reaction temperature of 175 to 240 ° C. and an air blowing amount of 30 L / hr / Kg On the other hand, 5 parts by mass of polyolefin wax B was heated and mixed at 210 ° C. to obtain blown asphalt. The properties are shown in Table 3.

(Example 5)
Reduced residual oil C: 75% by mass and paraffinic mineral oil: 25% by mass of a mixture of blown asphalt obtained by blowing for 8 hours at a reaction temperature of 180 to 250 ° C. and an air blowing rate of 35 L / hr / Kg. On the other hand, 5 parts by mass of polyolefin wax C was heated and mixed at 195 ° C. to obtain blown asphalt. The properties are shown in Table 3.

(Example 6)
Vacuum blown residue C: 75% by mass and paraffinic mineral oil: 25% by mass A mixture of blown asphalt obtained by blowing for 12 hours at a reaction temperature of 175 to 240 ° C. and an air blowing amount of 30 L / hr / Kg On the other hand, 5 parts by mass of polyolefin wax D was heated and mixed at 200 ° C. to obtain blown asphalt. The properties are shown in Table 3.

(Example 7)
Reduced residual oil B: 75% by mass and paraffinic mineral oil: 25% by mass of a mixture of blown asphalt obtained by blowing for 9 hours at a reaction temperature of 175 to 245 ° C. and an air blowing rate of 30 L / hr / Kg. On the other hand, 5 parts by mass of polyolefin wax A was heated and mixed at 195 ° C. to obtain blown asphalt. The properties are shown in Table 3.

(Example 8)
Residue at reduced pressure C: 75% by mass and paraffinic mineral oil: 25% by mass of a mixture of 100 parts by mass of polyolefin wax A: 5 parts by mass of polyolefin wax A: reaction temperature 170-240 ° C., air blowing rate 30 L / hr Blowing asphalt was blown for 14 hours at / Kg. The properties are shown in Table 3.

Example 9
Reduced residual oil C: 75% by mass and paraffinic mineral oil: 25% by mass of blown asphalt obtained by blowing for 12 hours at a reaction temperature of 180 to 240 ° C. and an air blowing rate of 25 L / hr / Kg. On the other hand, 5 parts by weight of FT wax was heated and mixed at 200 ° C. to obtain blown asphalt. The properties are shown in Table 3.

(Comparative Example 1)
Reduced residual oil C: 65% by mass and paraffinic mineral oil: 35% by mass of blown asphalt obtained by blowing for 14 hours at a reaction temperature of 170 to 240 ° C. and an air blowing rate of 30 L / hr / Kg. On the other hand, 5 parts by mass of polyolefin wax A was heated and mixed at 195 ° C. to obtain blown asphalt. The properties are shown in Table 3.

(Comparative Example 2)
Reduced residual oil C: 85% by mass and paraffinic mineral oil: 15% by mass of a mixture of blown asphalt obtained by blowing for 12 hours at a reaction temperature of 180 to 240 ° C. and an air blowing rate of 25 L / hr / Kg. On the other hand, 5 parts by mass of polyolefin wax A was heated and mixed at 200 ° C. to obtain blown asphalt. The properties are shown in Table 3.

(Comparative Example 3)
Reduced residual oil C: 75% by mass and aroma-based mineral oil: 25% by mass A mixture of blown asphalt obtained by blowing for 10 hours at a reaction temperature of 190 to 235 ° C. and an air blowing rate of 30 L / hr / Kg. On the other hand, 5 parts by mass of polyolefin wax A was heated and mixed at 195 ° C. to obtain blown asphalt. The properties are shown in Table 3.

(Comparative Example 4)
Reduced residual oil C: 75% by mass and naphthenic mineral oil: 25% by mass of a mixture of blown asphalt obtained by blowing for 15 hours at a reaction temperature of 195 to 255 ° C. and an air blowing rate of 24 L / hr / Kg. On the other hand, 5 parts by mass of polyolefin wax A was heated and mixed at 185 ° C. to obtain blown asphalt. The properties are shown in Table 3.

(Comparative Example 5)
Reduced residue A: 75% by mass and paraffinic mineral oil: 25% by mass A mixture of blown asphalt obtained by blowing for 10 hours at a reaction temperature of 185 to 240 ° C. and an air blowing rate of 30 L / hr / Kg was added to 100 parts by mass of blown asphalt. On the other hand, 5 parts by mass of polyolefin wax A was heated and mixed at 200 ° C. to obtain blown asphalt. The properties are shown in Table 3.

(Comparative Example 6)
It was obtained by blowing a mixture of 80% by mass of the residual vacuum C and 20% by mass of paraffinic mineral oil at a reaction temperature of 180 to 240 ° C. and an air blowing rate of 24 L / hr / Kg for 11 hours. The properties are shown in Table 3.

As is apparent from Table 3, the blown asphalt of the present invention obtained in Examples 1 to 9 is completely heated and melted by satisfying all the predetermined properties as compared with the blown asphalt obtained in Comparative Examples 1 to 6. It can be seen that the amount of smoke generated and the generation of odors are reduced.
Moreover, from the weather resistance test results of Example 1 and Comparative Example 6, it can be seen that the blown asphalt of the present invention is also excellent in weather resistance.

Claims (6)

  The softening point is 100 to 120 ° C., the penetration is 25 to 35, the oil bleeding property is 3 or less, the low temperature bendability is 1 ° C. or less, the temperature at which the viscosity is 100 mPa · s is 220 ° C. or less, and the viscosity is 60 mPa.s. A blown asphalt for waterproofing, characterized in that the temperature of s is 240 ° C. or lower.   Further, the flash point is 280 ° C. or more, the froth embrittlement point is −15 ° C. or less, the drooping length is 8 mm or less, and the dripping length after the heat stability test at 250 ° C. is 15 mm or less. Item 1. Blown asphalt for waterproofing construction according to item 1.   The blown asphalt for waterproofing work according to claim 1 or 2, wherein the blown asphalt for waterproofing work is obtained by heating and mixing a wax to a blown asphalt obtained by blowing a mixture of vacuum residual oil and mineral oil.   The blown asphalt for waterproofing work according to claim 1 or 2, which is obtained by blowing a mixture of vacuum residual oil, mineral oil and wax.   A blend of 3 to 10 parts by weight of wax and 100 parts by weight of blown asphalt obtained by blowing a mixture of 70 to 83% by weight of residual vacuum and 17 to 30% by weight of mineral oil, and mixing by heating. Item 4. A method for producing blown asphalt for waterproofing work according to item 1, 2 or 3. 5. The blow according to claim 1, 2, or 4, wherein 3 to 10 parts by mass of wax is blended with respect to 100 parts by mass of a mixture of 70 to 83% by mass of vacuum residual oil and 17 to 30% by mass of mineral oil. Manufacturing method for blown asphalt for waterproofing construction.