JPS58179279A - Corrosion protecting adhesive - Google Patents

Abstract

PURPOSE:To provide a corrosion protecting adhesive exhibiting sufficiently high corrosion protecting effect without lowering the adhesive strength, by compounding a corrosion protecting agent comprising metallic power having larger ionization tendency than the metallic component of the metallic material to be bonded. CONSTITUTION:The objective corrosion protection adhesive is prepared by compounding an adhesive (e.g. bisphenol-type epoxy resin, resol-type phenolic resin, novolac-type phenolic resin, butyral resin, etc.) with a corrosion protecting agent comprising metallic powder (e.g. Al, Zn, Mn, Cr, Mo, Ti, etc. preferably having a particle diameter of 2-6mu) having larger ionization tendency than the metallic component of the metallic material to be bonded. The amount of the metallic powder is 5-20 times the weight of the base adhesive. The metallic powder is preferably flaky Zn powder having a thickness of 1.5-2mu and a diameter of 6-12mu.

Description

[Detailed description of the invention] This invention relates to a rust-preventing adhesive.

Generally, when bonding gold materials such as copper plates with a bonding agent, it is necessary to roughen the surface of the area to be bonded using sandpaper, etc., and then apply the bonding agent there. It is being said. In this case, since the roughened gold material part is prone to rust, it is necessary to apply anti-rust paint to the surface of the adhesive to prevent air and water from reaching the surface of the adhesive. be exposed.

However, it is almost impossible to completely coat the adhesive part of the bonded metal materials with anti-rust paint because the part where the adhesive exists is between the metal materials and the gap is small. be. Therefore, a phenomenon occurred in which rust developed from the adhesive portion.

Therefore, the inventors conducted research to see if it was possible to make the adhesive itself retain its anti-rust properties, and found that IjI:
We encountered the problem that when a rust preventive agent was added to an adhesive, the adhesive strength of the adhesive was significantly reduced. As a result of further research to solve this problem, we found that if the adhesive contains a metal powder that has a higher ionization tendency than the metal components in the metal materials to be bonded, the adhesive force of the adhesive will be significantly reduced. It was discovered that a sufficient rust prevention effect can be obtained without deterioration, and the present invention was achieved.

That is, the gist of the present invention is a rust-preventing adhesive containing gold powder, which has a greater tendency to ionize than the metal components in the metal materials to be joined, as a rust preventive agent.

In this regard, the metal materials to be joined will be iron and stainless steel.

It can be made of steel or lead metal, and the shape of the material is not limited in any way. It may be plate-shaped or pipe-shaped.

The gold powder to be bonded has a high ionization tendency, depending on the gold component of the material to be bonded, from among the metal powders listed above according to the gold component of the material to be bonded. Legacy, A
I, Zn, Mn, Cr, Mo,”
The powder of l'i et al. Such gold powder is preferably in the form of a fine powder, and preferably has a particle size of 2 to 6 microns. The most preferable one is 3 to 4μ. If the particle size is smaller than 2μ, it will not be dispersed into single particles when dispersed in the adhesive agent (main agent) described later, and a good adhesive coating will not be obtained due to wrinkles between the particles. The rust effect will also be less effective.

Further, if the particle size is larger than 6 μm, the particles tend to separate from the adhesive, and the adhesive strength tends to decrease. 1. It is preferable to set the compounding ratio of the metal powder such that the metal powder is 5 to 20 times the amount of the adhesive (main ingredient) based on one lid. The most preferred is 10 to 15 times. If the violet content is less than 5 times, conductivity will not occur and no galvanic rust prevention effect can be expected, and if it exceeds 20 times, the adhesive strength of the adhesive will tend to be large and the weight will be low.

Among the metal powders, Zn powder in particular can be used regardless of the type of gold material to be joined, and its rust-preventing effect is also remarkable. Zn powder exhibits a sufficient rust-preventing effect even when it is in the form of particles, but the most preferable one is in the form of scales. The scale-like material preferably has a thickness of 1.5 to 2 .mu.m and a straightness of 6 to 12 .mu.m, particularly from the viewpoint of effectiveness.

The adhesive (main agent) to which the above-mentioned metal powder can be mixed may be any adhesive having adhesive ability to the gold-materials to be bonded, and the type thereof is not limited. However, the following resins are used as adhesives from the viewpoint that the adhesion strength does not decrease much even when gold powder is mixed therein. Bisphenol-type epoxy resin, resol-type 7-enol resin, novolac-type 7-enol resin, butyral resin, acrylic resin, di-reactive vinyl chloride resin (for example, a comonomer of vinyl chloride and vinyl acetate, and relatively Low-voltage products with carboxyl groups introduced), urethane resins. In addition, when manufacturing products such as rain gutters by covering steel sheets with vinyl chloride resin, especially non-gJ plastic hard vinyl chloride resin, modified acrylic resin (with acid groups in the molecule) is used as the adhesive resin.

Methyl methacrylate 7mer containing reactive functional groups such as hydroxyl group, amide group, amide/methylol group, epoxy group, hydroxyl group, etc. is blended at a ratio of 1150 to 1/100 mol to 1 mol of methyl methacrylate. It is preferable to use a combination of the two. This resin has excellent adhesion to both steel plates and vinyl chloride resin.

The anticorrosion adhesive of the present invention is produced by blending the gold powder with the resin described above, and further blending a hardening accelerating dispersion/settling agent, etc., as necessary. In addition, A
It is also within the scope of the present invention to use, as an auxiliary agent, an oxide or chloride-based compound of the gold maple powder, rather than the gold maple powder.

As described above, the rust-preventive adhesive of the present invention contains #t@ powder, which has a greater ionization tendency than the metal component in the metal materials to be bonded, as a rust preventive agent. It is possible to exhibit a sufficient rust prevention effect without significantly reducing the adhesive strength of the adhesive.

First, the implementation column will be explained together with the comparison column.

[Examples 1 to 4. Comparative Example 1] A rust-preventing adhesive was prepared by blending only the violet shown in the In2 table with the adhesive and metal powder shown in the following table. Next, the obtained rust-preventing adhesive is applied to a thickness of 5 to 10 μm on an iron plate that has been degreased with trichlene, and is overlapped with an iron plate that has also been degreased with trichlene, and the adhesive is fully reacted and cured in that state. The adhesive strength (peel strength) was measured. Further, 5 to 10 μm of the adhesive layer agent was applied onto the degreased steel plate to allow sufficient reaction permeability. JIS for that sample
A salt spray test specified in K-5400 was carried out, and the results are shown in Table 1 above, which shows that the anti-octopus ability of the one tested in test-j is poor. R-972 (anti-sedimentation agent) [Actual Jliil Examples 5-1
01 Zn powder was used as Kinho powder, and the blending amount was changed as shown in the table below. Other than that, anti-rust adhesives were prepared in the same manner as in Examples iQ1-4, and the adhesive strength and salt spray tests were conducted in the same manner as in Examples 1-4.

The results are shown in Table 2 below.

(See the margin below.) From Table 2, it can be seen that the amount of gold @ (Zn) powder to be blended is preferably set to 5-20 times the amount of the main ingredient.

[Examples 11 to 16] A piece of Zn was used as Kinpeng powder and the particle size was 4μ, 1 to 1.
Antirust adhesives were prepared in the same manner as in Examples 1 to 4 using Zn powders of 5μ and 8μ, and the adhesive strength and salt spray tests were conducted in the same manner as in Examples 1 to 4.

The result is the following third hypothesis.

(Left below) ◆l The adhesion is too large → the adhesive is unstable ◆2 The film thickness is too thick and unreliable. If it is too small, the adhesive will not be stable Since the injected particles remain in the coating, the strength also varies,
There are too many differences in rust prevention ability depending on the sample. When Zn is changed from granular to scaly, Zn wrinkles can be expected to have a sufficient anti-chilling effect even with a small amount of electric current.

[Examples 17 to 19] Using modified acrylic resin as the main ingredient, 51i! , Shi-jl
A rust-preventing adhesive was prepared in the same manner as in Examples 1 to 4, and its adhesive strength and salt spray tests were conducted in the same manner as in Examples 1 to 4. The results are shown in Table 4 below, and it can be seen that good results can be obtained even if the base agent is changed. Made by Mitsubishi Rayon #
1 liquid 1 mixture special MMA resin (N, V25) [Examples 20 to 23] Preparation of mackerel shield wounds in the same manner as in Examples 1 to 4 using acrylic resin or acrylic resin + reactive vinyl chloride resin as the main ingredient Construction, its (hard vinyl chloride resin)/(lj
The adhesive strength to a Clen degreased iron plate was determined to be 6411 m, and the rust prevention ability was also measured.

(The results for - are shown in Table 5 below.

Table 5 [- Adhesive strength: 5 to 10 liters of anti-rust adhesive applied to a Triclean degreased iron plate.
After coating with Oμ and baking, a hard vinyl chloride resin sheet was layered and bonded under pressure while maintaining the temperature at high temperature. This was used as a sample and its adhesive strength was measured.

Salt water fountain shot: Hit in accordance with JIS K-5400.

Claims (1)

[Scope of Claims] (11) A rust-preventing adhesive characterized in that a gold powder having a higher ionization tendency than the gold component in the gold-material to be bonded is blended as a rust preventive agent. 2) Gold - powder or grain &2
The anticorrosive adhesive according to claim 1, which has a particle diameter of 6 μm. (3) The blended violet of metal powder is based on the amount of f & adhesive (
The rust-preventing adhesive according to claim 1 or 2, wherein the rust-preventing adhesive is 5 to 20 times that of the main agent).