JPH05106174A - Asphalt-based waterproofing material - Google Patents

Abstract

PURPOSE:To obtain the subject waterproofing material effective for suppressing the surface deterioration of blown asphalt by sunlight and rain water and preventing the lowering of the quality by compounding blown asphalt with a specific inorganic metal salt or organic metal salt. CONSTITUTION:Molten blown asphalt is incorporated with an inorganic metal salt (e.g. chloride, carbonate, nitrate, etc., of alkalineearth metal, alkali metal, etc.) or an organic metal salt (e.g. carboxylate, sulfonate, etc., of alkaline-earth metal or alkali metal) as a cleaning and dispersing agent under stirring. The addition of the agent is effective for suppressing the formation of deterioration product and the generation of yellowish brown layer on the surface caused by the repeated exposure to sunlight and rain water and preventing the lowering of the quality of the material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an asphalt-based waterproof material useful as a raw material for various roofing.

[0002]

2. Description of the Related Art Conventionally, various asphalts have been used for the purpose of waterproofing buildings. These are applied on the surface of the uppermost layer of the waterproof structure, but the surface of the asphalt deteriorates under the influence of sunlight, rainwater, and night dew, and by repeating this, a very thin (around 50 μm) deteriorated product is formed on the surface. Countless cracks are generated in the deteriorated product due to repeated wetting / drying, and the edges of the fragmented thin film-like deteriorated product are turned up. There is a problem that light is diffusely reflected on the uneven surface to form a yellowish brown layer, the quality of the waterproof material is deteriorated, and the powder of the deteriorated material is washed away by rainwater to contaminate the wall surface of the building. As a method for solving these problems, a roofing material in which sand is coated on the asphalt surface or a method in which the surface is coated with a paint and masked (JP-A-52-18724) to prevent direct sunlight and prevent deterioration is performed. However, the roofing with sand does not provide uniform coverage. Further, even in the case of coating with a coating and masking with a maskin coating, a coating having excellent weather resistance is expensive, and a coating step is required also in terms of construction, which causes a problem of cost increase.

[0003]

DISCLOSURE OF THE INVENTION The object of the present invention is to overcome the drawback that the quality of a conventional asphalt waterproofing material is deteriorated due to the formation of a yellowish brown layer on the surface of the conventional asphalt-based waterproofing material, and the quality of the deteriorated material is reduced. The point is to provide a new asphalt-based waterproof material that does not pollute the wall surface with powder and does not increase the number of steps in terms of construction.

[0004]

DISCLOSURE OF THE INVENTION As a result of intensive studies to develop a high-quality asphalt-based waterproof material, the present inventors can achieve that purpose by adding a detergent-dispersant to blown asphalt. Based on this finding, the present invention has been completed. That is,
The present invention provides a blown asphalt with 0.3% detergent dispersant.
The present invention relates to an asphalt waterproof material containing 1 to 3% by weight. Examples of the detergent dispersant include inorganic metal salts and organic metal salts. As the inorganic salt, chloride,
Carbonates, nitrates, sulfates, etc. can be mentioned.
Examples of the organic metal salt include carboxylate, polyalkenyl succinimide, sulfonate, barium basic sulfonate, phenate, salicylate and phosphonate. Most of these have a molecular weight of 400 to 800. All of these detergent dispersants are usually used in the form of an alkaline earth metal salt or an alkali metal salt, but the Ca salt, Ba salt or Mg salt is the most common and is a conventionally known additive for petroleum products. All detergent dispersants can be used. The blown asphalt used in the present invention blows air into a soft asphalt at a high temperature (200 to 300 ° C.) to oxidize / polymerize
By performing a reaction such as condensation, it is a hard asphalt that has different properties from straight asphalt, has a high softening point, has a large elasticity, and there is little change in temperature (temperature sensitivity) due to temperature changes, water, air Also, it has little deterioration due to sunlight, has a strong resistance to impact, and has good waterproofness and electrical insulation. This antioxidant is generally added in the range of 0.3 to 3% by weight.
If the amount is smaller than this, there is no effect of controlling the oxidation and deterioration of the molecules included in the asphalt, and if the amount is larger than this, the effect of controlling oxidation and deterioration is reduced, and the product becomes expensive. .

[0005]

[Mechanism of generation of deteriorated material in laboratory experiment] Blown asphalt is formed into a sheet in a constant temperature bath at 180 ° C. When this sheet-shaped asphalt (A in FIG. 1) is irradiated with ultraviolet rays for 48 hours, a deteriorated product is generated and adheres to the surface (B in FIG. 1). When this is immersed in water, the deteriorated product gets wet and subdivided (C in FIG. 1). Further, if this is pulled up from water and left to stand, the edges of the thin film-like deteriorated material that has gradually dried and fragmented will rise. This surface becomes uneven and diffusely reflects light to form a yellowish brown layer (D in FIG. 1). The UV irradiation was carried out by a Ci65 type weather meter device manufactured by ATLAS. The untreated sample shown as A in FIG. 1 has a black glossy surface, and C according to the spectrum of IR analysis.
-H absorption bands of 2900 cm ^-1 , 1450 cm ^-1 , 1
380 cm ^-1 is detected. The asphalt after UV irradiation shown in FIG. 1B is a black sheet-like plate that has lost gloss as observed visually. The IR analysis spectrum of this surface shows a broad band (-OH around 3400 cm ^-1).
Group) 1700 cm ⁻¹ (representative functional group —COOH) is strongly absorbed. It has not been detected in untreated asphalt. It is clear that a degraded product is formed in these two absorption bands. In the sample after water immersion shown in D of FIG. 1, the same substance as before water immersion is detected. However, 3
Absorption around 400 cm ^-1 and 1700 cm ^-1 is weakened slightly. This is because the deteriorated material was partially dissolved and removed in water.

[0006]

【Example】

Example 1 The present invention will be described by way of examples, but the invention is not limited thereto.
Add the blown asphalt to the hot melt agitator 160-
After melting at 250 ° C., the sulphonate was stirred to give
1, 0.3, 0.5, 1.0, 3.0 and 5.0% by weight
Six types of asphalt melts were added and kneaded. After processing each of the obtained blown asphalt melts into a sheet of dimensions 1 × 50 × 130 mm,
Weather resistance tester (ATLAS Ci65 type Weath
Er-Ometer) for 48 hours and then immersed in water, 60 ° C x 1 day, 40 ° C x 2
After curing at 20 ° C. for 25 days, the generation of deterioration products / yellowish brown on each surface was observed and evaluated. The results are shown in Table 1. Example 2 As in Example 1, salicylate was used to observe and evaluate deterioration of each surface / generation of yellowish brown color. The results are shown in Table 1.

[Table 1] 〇 No yellow-brown color (no deterioration) × Yellow-brown color (deterioration)

Example 3 Blown asphalt was placed in a hot-melting and stirring vessel, and 160-
After melting at 180 ° C., 6 kinds of asphalt melts were prepared by adding 0.1%, 0.3, 1.0, 3.0 and 5.0% by weight of sodium chloride, respectively, with stirring. The resulting blown asphalt melt was processed into a sheet having a size of 1 × 50 × 130 mm and irradiated with ultraviolet rays for 48 hours, and then 60 ° C. and 40 ° C., respectively.
It was immersed in water at 20 ° C. for 5 days, taken out from the water, and dried to observe and evaluate the generation of deterioration products / yellowish brown on each surface. The results are shown in Table 2. Example 4 In the same manner as in Example 3, calcium chloride of each% was used to observe and evaluate surface deterioration / generation of yellowish brown color. The results are shown in Table 2.

[Table 2] 〇 No yellow-brown color (no deterioration) × Yellow-brown color (deterioration)

[0008]

【effect】

1. Compared to roofing materials manufactured using conventional blown asphalt, there is no significant deterioration,
Moreover, no yellowish brown layer is generated on the surface. 2. The sanding and painting processes that were indispensable for the roofing materials manufactured using conventional blown asphalt can be omitted and the construction can be done easily.

[Brief description of drawings]

FIG. 1 is a schematic diagram for explaining a mechanism of generating a deteriorated product on a surface of an asphalt sheet. A shows the state of untreated, B shows the state after UV irradiation, C shows the state when it was immersed in water, D
Indicates the condition when it is further dried.

Claims (1)

[Claims] 1. An asphalt-based waterproof material comprising a blown asphalt mixed with a detergent-dispersant.