JPS5952642A - Gummed asphalt sheet for corrosion-protecing steel plate - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sheet-like anti-corrosion material suitable for corrosion protection of constructed steel plates such as tank roofs.

Conventionally, in order to prevent corrosion on steel plates constructed like tank roofs, anti-corrosion paint or anti-corrosion coating agents made by diluting asphalt with a solvent have been used. Uniform thickness is 0 unless you apply it several times.
．． 5 to 1.5 is not only difficult to maintain, but also when the solvent evaporates during drying, cracks may occur and defects due to internal stress may occur, and when the coating film solidifies, it becomes brittle and the steel plate The movement and vibration of the steel cause peeling and cracking, which induces rusting and reduces the anti-corrosion effect. In this invention, rubberized asphalt, which is made by combining thermoplastic rubber with asphalt, is crosslinked at the applicable temperature, so it is a viscoelastic substance and has a larger stiffness value than asphalt under long-term loads, so it flows against compressive stress. It is possible to undergo viscous deformation without any viscous deformation. If a highly weather-resistant acrylic or EVA emulsion paint is applied to the surface of the semi-impregnated nonwoven or woven fabric on the top of the rubberized asphalt layer coated to a thickness of 0.5 to 3.0 mm, a suitable coating will be applied. We aim to provide a corrosion-resistant sheet that has a long-term corrosion-preventing effect on steel plates, forming a hard, highly weather-resistant protective layer that prevents the deterioration of the rubberized asphalt layer.

The rubberized asphalt layer according to the present invention has high tackiness at room temperature and undergoes viscous deformation when subjected to continuous small loads such as its own weight over a long period of time. When it comes into contact with the rubberized asphalt, Fantelwalska acts on the interface, so the contact surface of the rubberized asphalt not only undergoes viscous deformation corresponding to the surface of the steel plate, but also works to eliminate the air film remaining at the interface during construction, which lasts for several days. Later, the gas film becomes atomized and is finally absorbed by the rubberized asphalt surface layer, causing viscous deformation until it completely adheres to the steel plate surface. In this way, there is a phenomenon in which the air film at the interface is absorbed, which not only completely isolates it from the outside air, but also acts as a reducing agent on the surface of the steel plate. For this reason, it has been found that it is effective in preventing corrosion of copper plates over a long period of time.

It is presumed that the reason why the rubberized asphalt viscously deforms as it comes into close contact with the contact surface as described above is due to the presence of dysentery. This dysentery is largely controlled by temperature dependence, but it was thought that the button size of rubberized asphalt of 40 to 60 at and 25°C would be appropriate for suppressing flow and exhibiting the dysentery by compression.

In order to confirm this dysenteric property, the following experiment was conducted and the process will be explained with reference to Figures 1.2.3.4. In this experiment, a transparent glass plate, which is easier to observe than a steel plate, was used as the base plate. The temperature during the experiment was 18 to 25 degrees Celsius. Glass plates, like steel plates, do not contain water, so they do not generate gas when the temperature rises. When a rubberized asphalt sheet is attached, the process by which residual air disappears can be elucidated. estimated that.

・Figure 1 shows the residual distribution of the air film after adhering and crimping the rubberized asphalt sheet 4 to the glass plate.
It turns out that it is 0%.

- Figure 2 shows that two days after adhesion and pressure bonding, the air film decreases and is subdivided, and the non-adhesive area is approximately 15%.

・Figure 3 shows that after 7 days, the air film has further decreased and become atomized, and the non-adhesive area has become approximately 5 inches.

- Figure 4 shows that after 14 days, the air film has almost disappeared and only a few atomized particles can be seen, indicating that the non-adhesive area is almost O. Rubberized asphalt reacts with oxygen, but inert nitrogen also disappears, so we can only conclude that the surface layer absorbs air.

From the results of the above experiments, it was confirmed that rubberized asphalt is highly flexible and residual air is completely absorbed in about 14 days at approximately 20°C, resulting in complete adhesion of rubberized asphalt to the glass surface. Ta. Furthermore, from the results of the above experiments, it was assumed that similar results could be obtained even if a steel plate was used instead of the glass plate.

Rubberized asphalt has a light deoxidizing ability, so the surface of the steel plate in close contact with it is R1 of activation! It is considered that no rusting phenomenon will occur because it is unlikely that there will be any buildup.

Rubberized asphalt is coated with a weather-resistant acrylic or EVA emulsion paint to maintain its weather resistance and prevent deterioration of the rubberized asphalt. It retains its flexibility for a long period of time, and is almost never likely to break or crack due to stress caused by movement or vibration of the steel plate, thus blocking the outside air and ensuring corrosion protection over a long period of time.

Next, an example will be described.

Figure 5 shows a cross section of a rubberized asphalt sheet, and Figure 6 shows a 4° cross section of a portion of a steel plate with an anti-corrosion layer. 7) Asphalt-based primer) ~0.21/m 2A
G quasi-, id.

Add +m to the release paper of the rubberized asphalt sheet (a) (
5) is peeled off and adhered to the steel plate surface (8), and crimped to eliminate air as much as possible. After confirming the contact layer (3), apply a weather-resistant acrylic emulsion (shading standard fit 0.5 t, 7 m2) on top of the Wt nonwoven fabric (5). Layer (B) is formed.

This corrosion protection/1m (131's rubberized γ Sulfard disappears residual air over time and forms a W1 layer on the steel plate (8), showing slight reducing properties, and completely converts outside air and moisture to μ4Vr, so the copper plate is The mind fief11-j is suppressed for a long period of time.
There are 11.

This rubberized asphalt sheet is easy to install, has long-term rheological stability against stress, and has 11 chemical properties.
This product also has excellent anti-corrosion properties, so it can be expected to have excellent anti-corrosion properties. This anti-corrosion sheet is applied to the roofs of oil tanks and the steel plates of ships.

[Brief explanation of drawings]

Figures 1 to 4 are sketches showing the process of the rubberized asphalt sheet adhering to the glass plate due to its self-sufficiency.
i is 1-0 its details tar. Figure 1 is the first 3ki nIj drawn by pasting! This is a sketch showing the results of the distribution of the results. Figure 2 is a sketch showing changes in the air film and non-adhesive area after 2 days. Figure 3 is a sketch showing the change in the air film and the contact area after 7 days. Figure 4 is a sketch showing that the remaining bulge in the 141-1 ridge has disappeared and it is completely engulfed. FIG. 5 is a cross-section of a rubberized asphalt sheet, and FIG. 6 is a cross-section of a steel plate with an anticorrosion layer provided thereon. 1; Adhesive surface of rubberized asphalt (see through the glass surface) 2; Air film on the adhesive surface (A) same as above Rubberized asphalt sheet 3; Nonwoven fabric of rubberized asphalt sheet (partially impregnated with rubberized asphalt) 4 ; Rubberized asphalt layer 5 as above; Release paper (B) as above; Anti-corrosion layer 6; Weather-resistant acrylic emulsion paint 7; Rubberized asphalt primer 8; Steel plate patent applicant Towa Kogyo Co., Ltd. Me 5" No. 21

Claims (1)

[Claims] When a laminated sheet made of nonwoven or woven fabric made of polyester fiber or glass fiber is melt-processed with rubberized asphalt with a thickness of 3 mm or less to the extent that the surface is not impregnated, it will be rubberized when it is pressed onto a steel plate whose surface has been treated with a rubberized asphalt primer. Due to the tack and viscous deformation of asphalt, Van der Waals force acts on the interface where it contacts the steel plate surface, atomizing the air film that remains during construction, and a few days later, it is absorbed into the rubberized asphalt layer, so it becomes rubberized asphalt. The layer completely adheres to the steel plate and becomes one with the steel plate.
When a highly weather-resistant emulsion-type paint is applied to the upper surface of the upper non-woven or woven fabric, it forms a quick and uniform layer, completely blocking air and moisture and creating a corrosion-resistant coating that exhibits slight reducing properties on the contact surface. A corrosion-resistant rubberized asphalt sheet made of copper plate, which is a combination of rubberized asphalt and non-woven fabric or woven fabric.