JPS59182729A - Metallic plate coated with vinyl chloride resin - 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 an improvement in a vinyl chloride resin-coated metal plate, which is obtained by coating the surface of a metal plate such as a steel plate with a vinyl chloride resin layer.

In general, vinyl chloride resin-coated metal plates, which are made by painting and baking a vinyl chloride resin dispersion paint, or sol paint, on the surface of a metal plate, have a higher quality compared to other synthetic resin-coated metal plates.
The paint layer is sufficiently durable for press processing such as bending, punching, or deep drawing, and the sol paint can be applied thickly, so the vinyl chloride resin layer that is the paint layer is formed into a thick film. It has excellent weather resistance and corrosion resistance. Therefore, such vinyl chloride resin-coated metal plates are currently being suitably used in a wide range of fields, and further expansion of their use is expected.

However, although it has excellent weather resistance and corrosion resistance, the thick film coating that is normally applied is still insufficient when used in harsh corrosive environments such as roofing materials of pharmaceutical factories and steel factories. No, no.

In addition, it is generally known that vinyl chloride resin deteriorates when exposed to ultraviolet rays, and its layers are eroded by about 5 to 10 μm per year. Moreover, there is a risk that delamination may sometimes occur due to the influence of ultraviolet rays. There is a limit to its useful life.

From the viewpoint of durability, it is desirable to make the paint layer thicker, but on the other hand, if the paint layer is made too thick, workability such as bending will decrease. Moreover, due to the increase in the amount of plasticizers contained in vine paints, there are problems in terms of staining and surface hardness, etc.)
A condyle will develop. In particular, when used as a noncombustible material, the thickness of the paint layer must be 250 μm or less in order to pass the Ministry of Construction's noncombustible material certification test, from the viewpoint of pollution caused by the plasticizer content, that is, the amount of toxic gas generated. The reality is that the situation is suppressed.

The present invention has been made in view of the points described in 1.
It is rich in edibility, lIU, 1 humidity, acid resistance, strong alkalinity, etc., and can prevent delamination as much as possible due to the effects of ultraviolet rays, and has a much longer service life than conventional products.
The object of the present invention is to provide a metal plate coated with a vinyl chloride resin that can be put to practical use as a noncombustible material.

The vinyl chloride resin-coated metal plate of the present invention, which solves this problem, uses a 3-coat, 3-bake method to coat the base surface of the metal plate with a single layer of primer and a vinyl chloride resin dispersion paint containing granular inorganic particles with an average particle size of 5 to 100 μm. An intermediate coating layer formed by applying a paint containing 100 to 300 parts by weight of vinyl chloride resin to 100 parts by weight of vinyl chloride resin to a dry film thickness of 150 to 25,011 m, and a polyvinyl chloride resin Tespajo/paint with a dry film thickness of 100 to 25,011 m. When 150 μm is applied, coating layers are sequentially laminated.

The present invention will be explained in detail below.

Examples of metal plates include cold-rolled steel plates, galvanized steel plates,
A stainless steel plate, an aluminum plate, a zinc/aluminum alloy plated steel plate, etc. are used.

The vinyl chloride resin-coated metal plate of the present invention has a base surface of a metal plate as described in 2.
-It is made by sequentially laminating coating layers, but in forming each layer, the so-called 3-coat process involves repeating normal painting and baking.
A three-hake method is used.

The first layer of primer is used to ensure good adhesion between the metal base and the paint layer and to exhibit a rust-preventing effect, and is formed by applying a primer to the base surface of the metal plate and baking it.

The dry film thickness of one layer of the primer may be in the same range as in the usual case, for example, about 3 to 5 μ7 yL is sufficient. As the primer, a suitable one for sol paints such as epoxy resin or acrylic modified epoxy resin can be used.

Then, on top of the baking-spooned primer layer, an intermediate coating is applied and baked to give a dry film thickness of 150 to 25 mm.
An intermediate coating layer of 0 μm is laminated.

The intermediate coating is made by adding 100 to 300 parts by weight of a granular inorganic material with an average particle size of 5 to 100 μm to 100 parts by weight of vinyl chloride resin (vinyl chloride paste resin) in a normal vinyl chloride resin dispersion paint (that is, sol paint). It is uniformly blended at a ratio of .

The vinyl chloride resin paste resin/paint may be either a plastisol in which vinyl chloride resin powder is dispersed in a plasticizer or an organosol in which a portion of the vinyl chloride resin powder is dispersed in a solvent, but preferably 100 parts by weight of vinyl chloride paste resin and 15 to 70 parts by weight of a plasticizer. Parts by weight, 3 to 6 parts by weight of stabilizer, 5 to 6 parts of coloring pigment
A plastisol having a composition of 30 parts by weight and θ to 1 part by weight of other additives is used.

Among them, the more desirable composition is vinyl chloride paste resin 7
For 100 parts by weight, 35 to 45 parts by weight of plasticizer, 3 to 6 parts by weight of stabilizer, 10 to 20 parts by weight of pigment, and other additives O
A coating viscosity of 3,000 to 200% by weight is desirable in relation to the two-coat composition.
It is desirable to take care to keep it within the range of 0 (100 cenotypoise).

Furthermore, as the inorganic material, those commonly used as inorganic fillers in the paint field can be used, such as CaO1CacO3, MgO1S102, Al2O
Glass, silica sand, alumina, quartz, calcium bicarbonate, etc. whose main components are SiC, Ca5o4, etc. or a mixture thereof are used.

By the way, as a granular inorganic material, the average particle size is 5 to 100 μm.
If you use particles with an average particle size of less than 5777)'L, the viscosity of the intermediate coating will become too high and the workability of the intermediate coating will deteriorate;
This is because if it exceeds 1 m, it becomes difficult to obtain a uniform coating film.

In addition, the amount of granular inorganic material added is determined by increasing the dry film thickness of the intermediate coating layer by 1
50 to 250 Jlm and the dry film thickness of the L coating layer to 100 to 150 μm, the resin coating is made nonflammable and the moisture permeability is reduced to improve corrosion resistance and moisture resistance. Moreover, it is extremely important to optimally exhibit painting workability, workability, and coating film performance, and with this point in mind, it is set as described in 4-.

In addition, the reason why the dry film thickness of the intermediate coating layer is set to 150 to 250 μm is that if the dry film thickness is 150 μm, it may impair the corrosion resistance, moisture resistance, etc. of the paint film, and if it exceeds 250 μm,
Relationship L in which the dry film thickness of the top coat layer is 100 to 150 μm,
This is because the non-flammability performance cannot be fully demonstrated.

Furthermore, on the intermediate coating layer, a 1 coat of vinyl chloride resin dispersion paint is applied and baked.
A north coating layer with a dry film thickness of 100 to 150 μm is laminated.

As the coating material, either plastisol or organosol may be used as in the case of the salt 1-hibinyl resin dispersion paint used in the intermediate coating, but it is preferable to use plastisol as in the above-mentioned intermediate coating. Therefore, the composition of the vinyl chloride dispersion paint may fall within the wide composition range of the above-mentioned intermediate paint, but it is more preferable to use 15 to 25 parts by weight of the d-engineering plasticizer per 100 parts by weight of the vinyl chloride paste resin. Parts by weight, 3 to 6 parts by weight of stabilizer, 20 to 30 parts by weight of pigment, and 0 to 1 part by weight of other additives are desired.

Further, it is desirable to take care to keep the viscosity of the coating material within the range of 2000 to 8000 centipoise.

The second coating imparts weather resistance, and its dry film thickness is preferably 100 μm or more in order to maintain long-term durability, but if it is 150 μm or more,
Long-term durability remains almost unchanged. Therefore, if economic efficiency is considered, it is sufficient to set the northern limit of the dry film thickness to 150 μm.

Next, each component of the vinyl chloride conversion paint mentioned in 1 will be explained. Examples of vinyl chloride resin include vinyl chloride resin alone, as well as copolymers containing vinyl chloride (e.g., vinyl chloride-ethylene-vinyl acetate copolymer).
It may also be a blend of vinyl chloride resin and other resins (eg, styrene/acrylonitrile copolymer, vinyl acetate copolymer). In order to make them compatible with paints, it is usually desirable to use a paste resin made by emulsion polymerization, but coarse powder obtained by the micro suspension polymerization method or suspension polymerization method may be used in combination to reduce the viscosity of the paste.

Various plasticizers may be used from the viewpoint of paint viscosity, coating film properties, economic efficiency, etc. The 11 examples are DO
P (2-ethylhexyl phthalate), D HP (
diheptyl phthalate), n-DOP (dinomaroctyl phthalate), DIDP (diisodecyl phthalate), T
CP (trichlene phosphate), DOA (dioctyl adipate), DO3 (maethylhexyl sepadinoate),
Examples include TXIB (Texanol Isobutyrate), polyester plasticizers, and epoxy plasticizers.

In addition, stabilizers are added to suppress the decomposition of vinyl chloride resin due to ultraviolet rays and heat, but these stabilizers include:
Specifically, t3 tin-based compounds (e.g. dibutyltin laurate, malate).

mercaptides), metallic soaps (e.g., salts of stearic acid, lauric acid, naphthenic acid, and maethylhexoic acid of lead, cadmium, barium, zinc, and calcium), lead salts (e.g., basic lead carbonate).

Examples include tribasic lead sulfate, dibasic lead phthalate, tribasic lead maleate, and lead silicate.

These can be used alone or in combination.

As the coloring pigment, pigments such as titanium white, carbon black, phthalocyanine blue, phthalocyanine green, boryanone type, quinacridone type, acisurachino/type, isoindritsuno type, and perylene type are used alone or in combination.

As explained above, in the vinyl chloride and oil coated metal plate of the present invention, the primer layer and the ordinary vinyl chloride resin coating have a dry film thickness of 100 to 150/1.
Between the L coating layer applied to M and the average particle size of 5 to 100
A special vinyl chloride resin dispersion/paint containing 100 to 300 parts by weight of granular inorganic material of μm to 100 parts by weight of vinyl chloride resin has a dry film thickness of 150 to 2.
A polyvinyl chloride resin layer consisting of an intermediate coat layer and a -1-coat layer is applied to a thickness of 250 μm to 50 μm.
Because it is formed over a thickness of 400 μm, it has excellent weather resistance, durability, corrosion resistance, moisture resistance, acid resistance, 1 (lFl alkalinity, etc.), significantly increasing the service life, and improving coating film performance. It will also be significantly improved.

Conventionally, when forming a vinyl chloride resin layer using a vinyl chloride resin coating, whether the coating is plastisol or organosol, it contains a large amount of plasticizer. As already mentioned, for this reason, the thickness of the vinyl chloride resin layer cannot be made too thick, and has to be, for example, 250 μm or less as a noncombustible material. However, in the present invention, since the intermediate coating layer, which is thicker than the L coating layer, is formed by applying a special vinyl chloride resin dispersion paint containing granular inorganic material as described above, the vinyl chloride resin layer Although the overall thickness is much thicker than conventional ones,
It is possible to maintain the plasticizer-HL contained in the thickness of the vinyl chloride resin layer per unit area to the same level as in the conventional vinyl chloride resin-coated metal plate used as a noncombustible material, thus preventing contamination. In terms of properties, A-plate can be provided on vinyl chloride resin-coated gold j, which is sufficiently practical as a noncombustible material.

Moreover, although the overall thickness of the vinyl chloride resin layer is thicker, it is
1-The dry film thickness of the coating layer is 100 to 15
The thickness is only 0 μm, and the intermediate coating layer contains vinyl chloride resin 1.
Since the particulate carbon material with an average particle size of 5 to 100 μm is contained in a ratio of 100 to 300 parts by weight per 00 heavy wind area, it has excellent workability such as bending.

Furthermore, the intermediate coating layer containing an inorganic material effectively blocks ultraviolet rays and functions to effectively prevent delamination by chalking the primer layer, thereby preventing deterioration and delamination caused by ultraviolet rays. It is expected that the product will be prevented for a long period of time and its service life will be extended.

Next, embodiments of the present invention will be explained.

〔Example 〕

The vinyl chloride resin-coated metal plates of Examples 1 to 7 were galvanized steel plates (thickness: 0.27 mm) treated with Granozin 46 (a zinc phosphate embedding agent manufactured by Nippon Paint Co., Ltd.) before painting.
Apply a primer (epoxy-modified acrylic resin paint) to the north surface of the material (mm) and bake it for 60 seconds so that the maximum temperature the material reaches is 200°C to achieve a dry film thickness of 3~
A single layer of 5 μm primer is formed, and then a granular inorganic material is added to this primer ■VINYSOL 100OYK White (exterior plastisol manufactured by Nippon Paint Co., Ltd.) and mixed uniformly with a high-speed stirrer. When applying Tsunoreda intermediate coating paint, the maximum temperature reached is 200.
An intermediate coat layer is formed by laminating fine sand for 60 seconds so that the temperature becomes 8C, and then super clad 1100 (
The material is coated with Nippon Paint Co., Ltd.'s Exterior Plastisol) and baked for 60 seconds to reach a maximum temperature of 200'C to form a laminated L coating layer. The composition, average particle diameter, amount added, and dry film thickness of the intermediate coat layer and the dry film thickness of the top coat layer of the granular inorganic material in each vinyl chloride resin-coated metal plate are as shown in Table 1. Note that each layer is coated using a roll coating method.

The performance of the salt 1' hibinyl resin-coated metal plates of Examples 2 and 2 was evaluated using the following evaluation method, and the results shown in Table 3 were obtained.

Judgment method (1) Intermediate coating properties The coating properties of the intermediate coating were evaluated using a reverse roll coater. A case where a good and uniform yarn membrane is obtained is indicated as ○, and a case where a uniform thread membrane cannot be obtained due to scratches such as streaks or unevenness is indicated as ×.

(2) Weather Resistance Determined by the Emacure Test (Outdoor Accelerated Weather Resistance Test) proposed by Desert Laboratories. Good ones are marked with ○, fair ones are marked with △, and poor ones are marked with ×.

(3) Acid resistance: Determined by immersion in a 5% sulfuric acid aqueous solution for 3000 hours. If there is no abnormality at all, ◎, if it is in good condition, ○.
Average items are displayed as △, and inferior items are displayed as ×.

(4) Alkali resistance: Determined by immersion in a 5% caustic sorter aqueous solution for 3000 hours. Items with no abnormalities are indicated as ◎, good items as ○, and normal items as △.

(5) Workability Judgment was made by the f(1) curve of the bent part when bent 180°. No abnormality: ◎, good: ○.
Normal items are displayed as △.

(6) Corrosion resistance Determined by a turt spray test according to JISZ 2371. If there is no abnormality at all, ◎, if it is in good condition, ○.
Normal items are displayed as △.

(7) Moisture resistance Determined by a test according to JISK z 246. Items with no abnormalities are indicated as ◎, good items as ○, and normal items as △.

(8) Nonflammability It was decided whether or not it passed the Ministry of Construction's noncombustible material certification test.

Items that can be passed are marked with ○, and items that cannot be passed are marked with ×.

Furthermore, as Comparative Examples 1 to 17, vinyl chloride resin-coated metal plates were obtained in the same manner as in Example 21. However, for each vinyl chloride resin-coated metal plate, the composition, particle size, amount added, and dry film thickness of the intermediate coating layer and L coating layer of the granular inorganic material are as shown in Table 2. be. In addition, Table 2
In addition, if the average particle diameter of the granular inorganic material, the amount added, the dry film thickness of the intermediate coating layer, and the value of the dry film of the L coating layer deviate from the ranges defined by the present invention, the rectangular frame will be used. It is clearly indicated by enclosing it in .

When the performance of the vinyl chloride resin-coated metal plates of each of the above comparative examples was evaluated using the evaluation method shown in L, the results shown in Table 4 were obtained.

By comparing Tables 3 and 4, the present invention will be more clearly understood.

<Table 1> <Table 2> <Table 3> (Valve 4)

Claims (1)

[Claims] Apply 100 to 300 parts by weight of granular inorganic material with an average particle size of 5 to 100 μm to 100 parts by weight of vinyl chloride resin to the primer layer and vinyl chloride resin dispersion paint on the base surface of the metal plate by a 3-coat/3-bake method. An intermediate coating layer formed by applying a paint blended in the ratio of 150 to 250 μm in dry film thickness and a top coat layer formed by applying a vinyl chloride resin dispersion paint to a dry film thickness of 100 to 150 μm are sequentially laminated. Characteristic vinyl chloride/grease-resistant coated metal plate.