JPS61211376A - Rust-and corrosion-preventing coating material composition - Google Patents

Abstract

PURPOSE:To obtain a coating material which does not cause lowering in adhesion even in a highly humid atmosphere as well as in water and capable of providing an excellent coating, by using a mixture of an alumina cement with a quaternary ammonium silicate and a synthetic resin emulsion as a binder. CONSTITUTION:A coating material composition containing a binder comprising 100pts.wt. alumina cement, 10-250pts.wt. (on a solid basis) quaternary ammonium silicate and 1-50pts.wt. (on a solid basis) synthetic resin emulsion miscible with the above components. The addition of a zinc powder in an amount of 1-100pts.wt. per 100pts.wt. alumina cement improves the rustproofness of the paint material while maintaining the adhesion and heat resistance. An acrylic resin is preferable as the synthetic resin emulsion from an overall point of view including its endurance.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present BA relates to a wall material composition for preventing rust and corrosion on iron surfaces and having heat resistance.

[Conventional technology]

Conventionally, a method has been used to treat the steel surface of the steel surface. (binder) is used.

However, these are generally solvent-based and have safety issues.
There are also many problems in terms of resource conservation and hygiene. Furthermore, since the commonly used binder is organic, it has difficulties in weather resistance and heat resistance, and the film thickness is generally thin, less than 0.3 ml, which may cause problems in abrasion resistance.

It should be noted that various methods other than these anti-corrosive materials have been adopted. For example, there is a method of covering iron pipes with cement mortar and passivating the iron surface with the alkali of cement, which is expected to have a rust-preventing effect.

Cement mortar alone does not have enough adhesion force to the steel surface, so cracks occur due to drying shrinkage, and there are problems with mechanical impact resistance, acid resistance, etc.

To improve these shortcomings, cement)% rutal, miscible with this! A synthetic resin emulsion was added. Anti-corrosion methods have been used in which polymer cement Sortal is applied to steel surfaces, but there are many problems with water resistance.
Particularly in high-temperature atmospheres or in water, it may cause blistering and peeling, and there is a limit to its heat resistance.I) It has the disadvantage of causing explosions at temperatures of 400 to 500°C.

[Problem that the invention seeks to solve]

In order to solve these drawbacks, the present inventors have filed a patent application (Japanese Patent Application No. 57-210458) for an inorganic coating composition that has strong adhesion to iron surfaces and excellent heat resistance. This is the invention! This is a further improvement.

In other words, one object of the present invention is (a) strong adhesion to iron surfaces.
(b) Excellent heat resistance, (c) long pot life, and (b) strong coating film at room temperature! It is an object of the present invention to provide a wall material composition for rust and corrosion prevention, which has excellent anticorrosion properties and also has coating characteristics (e) that can simultaneously satisfy conditions such as being non-polluting and inexpensive.

[Means for solving problems]

The present inventors have discovered that if a mixture of cement and a synthetic resin emulsion is further added with quaternary ammonium silicate as a binder, the adhesive force will not deteriorate even in a high humidity atmosphere or in water. It was discovered that a coating film with excellent performance could be obtained.

Based on this, the present invention was completed.

It is important that the cement used in the present invention is an alumina cement, such as Portland cement.

When blast furnace cement, slag cement, etc. are mixed with quaternary ammonium silicate, they set quickly and become difficult to work with.

As the synthetic resin emulsion, any resin may be used as long as it can be uniformly mixed with cement, such as acrylic resin, styrene-acrylic resin, styrene-butadiene resin, ethylene-vinyl acetate resin, and ethylene-vinyl acetate resin. However, when considering comprehensively including durability, acrylic resin is preferable.

The amount of resin based on the weight of the alumina cement 1001 is 1 to 50 parts by weight, preferably 5 to 30 parts by weight as solid content. If the resin content is less than this, the effect of improving adhesion will be small; if it is more than this, the effect of improving adhesion will be small.

In addition to being expensive, it tends to blister in water and has reduced heat resistance.

The amount of quaternary ammonium silicate per 100 parts by weight of alumina cement is suitably 50 parts by weight so that the solid content is 10 to 250 parts by weight. If it is less than 10 parts by weight, the pot life will be shortened, painting workability will be significantly poor, and the adhesion to iron surfaces and heat resistance will also be reduced, making it impossible to put it to practical use. Moreover, if it exceeds 250 parts by weight, cracks are likely to occur in a single coating film, resulting in coating film defects! more likely to occur.

The wall material composition of the present invention is the alumina cement described above.

In addition to the synthetic resin emulsion and quaternary ammonium silicate, various known additives such as thickeners, pigments, aggregates, waterproofing agents, and fibers are blended.

A wall material composition having performance and workability suitable for the purpose can be obtained.

By adding 1 to 100 parts by weight of zinc powder to 100 parts by weight of alumina cement, the above-mentioned wall material composition can improve its anticorrosion ability while maintaining adhesion and heat resistance. In this case, the amount of zinc dust added is smaller than that of conventional zinc dust paints.

In addition, when light calcined magnesia is added in the range of 0.1 to 30 parts by weight per 100 parts by weight of alumina cement, it accelerates the hardening of the coating film without reducing performance such as adhesion.
A wall material composition suitable for painting work under adverse conditions such as high-temperature environments can be obtained. If the amount of zinc powder added is less than the above range, there will be no effect, and if it is more than this, curing will be rapid (too much work will become difficult).

As a base to which the wall material composition of the present invention is applied.

In addition to steel structures, there are concrete, mortar, blocks, etc.11. It is also effective as a waterproof decorative wall material for these bases. Paint the base with a roller.

It can be easily applied by brushing, spraying, etc.

〔Example〕

The present invention will be explained below with reference to Examples and Comparative Examples.

Table 1 summarizes the formulation compositions of the present invention and comparative examples, as well as the test results thereof, and the six manufacturing methods and test methods for each coating composition are listed below.

According to the composition of each example and comparative example in Table 1, the powder content (
Transfer 1) and liquid (2) to separate containers (total of 6).

The mixture was sufficiently stirred with a disper, added to (x)7i/(2) with stirring, and thoroughly stirred and mixed until homogeneous to produce a wall material composition.

Test method a] Pot life: The time from when the wall material composition manufactured using Vcl as described above is manufactured until it becomes unpaintable.

b) Appearance of the paint film Apply the wall material at a ratio of 1-/- to a sandblasted steel plate with a thickness of 2 m/m, and after curing and drying, visually inspect the paint film to see if there are any blisters, cracks, or wrinkles. Observed with.

Judgment criteria: 0 Dense and good coating film on the surface ○ Good coating film X Cracks and peeling occur C] Adhesion strength After curing the test board prepared in [b] for 14 days.

Tensile strength of 40x40as l) A test piece for testing was adhered to a test plate with adhesive and adhesion strength was measured using a uniaxial tensile tester.

d] Heat resistance test After curing the test plate Y prepared in b) for 14 days.

After heating at a temperature of 500° C. for 1 hour and cooling in nitrogen atmosphere, the coating film was visually observed to see if there were any blistering, cracking, peeling, or sagging.

Judgment criteria: ◎No change at all O only discoloration ∆6]
Moro (naru x burn and powder e) salt spray test Degreased 1 50m x 70m x 1m polished mild steel plate 1.
Apply it evenly at a ratio of 5 Kg/lr/I] After curing the applied test board for 7 days - surrounding and back surface! Covered with Frethane resin, tested by the salt spray method specified in JIS K 5400, and inspected the coating at regular intervals to check for rust.
Displays the time until blistering occurs.

f) Water immersion test A test panel treated in the same manner as e) was suspended in fresh water maintained at a temperature of 0°C ± 2°C to a depth of 90 m, and the coating film after 1000 hours had passed. Observe whether rust, blistering, peeling, etc. occur.

Judgment Criteria 2 〇 No change △ Partially blown (Rainbow formation x Blistering on the entire surface g) Accelerated weathering test A test plate treated in the same manner as in e) was subjected to the sunshine carbon arc firing weathering test method specified in JIS K5400. Test it.

1L judgment criteria to determine whether rust, blistering, peeling, or whitening occurs in the paint film after 1000 hours: ◎No change ○Slight yellowing △Whitening phenomenon × No blistering or peeling (Note) Test plate The preparation and curing were performed in a constant temperature room at 20°C and 70% humidity.

Examples 1 to 20 and Comparative Examples 1 to 9 The above tests were performed on various uniformly mixed wall material compositions of powder and liquid components shown in the table! The results are summarized in the table.

Table 1 relates to the present invention l), and Table 2 relates to compositions outside the present invention.

As is clear from the Examples and Comparative Examples shown in the table above, the composition of the present invention has strong adhesion even at high humidity (and is heat resistant).
It has extremely excellent properties such as controllable pot life.

Claims (1)

[Scope of Claims] 1. The binder includes 100 parts by weight of alumina cement, 10 to 250 parts by weight of quaternary ammonium silicate as a solid content, and 1 to 50 parts by weight of a synthetic resin emulsion that is miscible with these as a solid content. A rust- and corrosion-proofing wall material composition comprising: 2. The rust- and corrosion-preventing wall material composition according to claim 1, wherein the binder contains 1 to 100 parts by weight of zinc powder. 3. The binder contains 0.1 to 0.1% of light calcined magnesia to the binder.
100 parts by weight of the rust- and corrosion-preventing wall material composition according to claim 1.