JPS6163497A - Aluminium alloy material for printing plate - Google Patents

Abstract

PURPOSE:To easily form a roughened surface on an aluminium alloy material without the needs for skill by providing a covering layer composed of a mixture of a water-soluble organic polymer and a silicate compound as represented by a specific formula on the surface. CONSTITUTION:For an aluminium alloy material for printing plates, a covering layer composed of a mixture prepared by dispersing a silicate compound of the formula xM2O.ySiO2 (where y/x>=2) in one or two or more hydrophilic organic polymers selected from styrene-maleic acid copolymers, polyacrylamide, butylene-maleic acid copolymers, polyacrylic acid, or salts of these is provided on the surface of the aluminium alloy material. The covering layer is gelled by drying after being coated to become a porous film. The covering layer gives a satisfiable hydrophilic property to be needed for the supporter of offset printing plates.

Description

Detailed Description of the Invention 1. Field of Industrial Application 1. The present invention relates to an aluminum alloy material (including aluminum material) for printing plates, and more specifically, to PS IJi used in offset printing or a support for offset printing plates. This invention relates to an aluminum alloy material (including aluminum material) for printing, which has a coating layer on its surface that is excellent in hydrophilicity, water retention, and adhesion to the image area.

[Prior art 1] Generally, in offset printing, aluminum plates or aluminum alloy plates have been used as supports for a long time. It is necessary to keep this in mind.

Conventionally, as a surface roughening treatment method for an aluminum plate or an aluminum alloy plate as a support for an offset printing plate, ball polishing method, brushing stone pi polishing method, or sand 7 last:・'Pl mechanical treatment method is used. Alternatively, the surface of an aluminum plate or aluminum alloy plate has been roughened by electrolytic etching or chemical etching.

Therefore, (when performing the surrogate surface roughening force method, the machine,
It requires considerable skill to adjust the abrasive, and it is difficult to use a roughened aluminum plate or aluminum 4, (°“′”<M
i[MaiTu,: “'fts゛”! "4""6""1
．． There is a problem in that it requires work to remove 7'b5 nium debris, etc., and when chemical surface roughening is performed, it is necessary to control the bath composition, bath temperature, etc. within a fairly narrow area. ,
The problem is that relatively long etching times are required to obtain the surface roughness required for offset printing plate supports, and electrochemical methods, which provide the best surface roughness, consume less power. However, there is a problem in that the proportion of the manufacturing cost of the printing plate becomes considerably large.

[Problem to be Solved by the Invention 1] The present invention has been made in view of the various problems of surface roughening of aluminum materials or aluminum alloy materials used as supports in conventional offset printing described above. As a result of intensive research by the inventors, we have developed an aluminum alloy material for printing plates that can significantly streamline the manufacturing process and satisfy the performance required for supports for offset printing plates. .

1. Means for Solving the Problems J The features of the aluminum alloy material for printing plates according to the present invention are as follows: Styrene maleic acid copolymer, polyacrylic 7mide, 7 styrene maleic acid on the surface of aluminum or aluminum alloy. one or more water-soluble organic polymer substances selected from copolymers, polyacrylic acids, or salts thereof;
The reason is that a mixture coating layer with a silicate compound represented by the following formula % is provided.

The aluminum alloy material for printing plates (including aluminum material) according to the present invention will be described in detail below.

That is, in the aluminum alloy material for printing plates according to the present invention, the silicate compound represented by xM20・ySio2 (y/x≧2) is combined with styrene maleic acid copolymer, polyacrylic 7mide, butylene maleic acid Combination, polyacrylic acid or one or two of these salts 1
．． An organic polymer with hydrophilic properties is dispersed in the substance (an undefeated mixture coating layer is provided on the surface of the aluminum alloy, and this undefeated mixture coating layer is dried after application. As a result, it gels and becomes a porous film.This coating layer of a mixture of polyester and polyurethane provided on the aluminum alloy surface achieves the wood-philicity required for the support for off-cent printing clothes. be able to satisfy the following.

In addition, since the organic/undefeated mixture coating layer described above is porous, printing may be interrupted, or the surface of the organic/indefeasible mixture coating layer may be contaminated by oil in the atmosphere when the clothes are stored. Also, since the coating layer has a porous hydrophilic surface inside, it protects the non-image area, prevents deterioration of hydrophilicity due to contamination, exhibits excellent sustainability of hydrophilicity, and has excellent water retention ability. (2) The fine irregularities generated on the surface of the undefeated mixture coating layer enhance the anchoring effect and improve adhesion to the image area. You can add 114 to .

Note that certain photosensitive layer components used in printing plates may react with aluminum alloy during storage and cause printing stains, but in the aluminum alloy material for printing plates according to the present invention, aluminum alloy The water-soluble organic polymer substance provided on the material surface and xM20-ySio, (y/x≧2
The organic undefeated mixture coating layer with a silicate compound shown in ) has no chemical reactivity with the photosensitive layer components and can prevent the photosensitive layer from being altered by the aluminum alloy material.

In the aluminum alloy material for printing plates according to the present invention,
It is important to provide a mixture coating layer of a water-soluble monopolymeric material as explained above and a silicate compound represented by a specific formula; in either case, a porous coating layer is provided. I can only get it.

The mixing ratio of the water-soluble organic polymer substance and the silicate compound is the weight ratio: water-soluble organic polymer substance disilicate compound = 2
:1 to 4:1, which is a preferable range, or 5-, which is not limited to 1 or r, and may be changed depending on the usage situation.

In addition, the silicate compound is XM2O・ysio2 (h4=1
．． 1, Na, K), and y/x≧2. If y/x is less than 2, a porous organic/black isocarbon mixture coating layer cannot be obtained.

The concentration of the treatment liquid for forming such an organic/non-organic mixture coating layer may be determined as appropriate depending on the treatment method.
For example, in the industrially common roll coating method, (), 5
~it)%, preferably 2 to 10% in the dip treatment method.

In addition, the thickness of the organic/non-organic mixture coating layer is +1.05~
It is best to use 2 μ noodles; if the thickness is less than 0.05 μ I11, the desired hydrophilicity cannot be obtained, and if the thickness exceeds 2 μ steel, this effect will be saturated and the appearance will be uneven, and It is uneconomical.

Furthermore, the aluminum alloy material for printing plates according to the present invention can be used satisfactorily even if the aluminum or aluminum alloy is subjected to aluminization treatment, electrolytic polishing treatment, and ball polishing treatment. .

[Example 1] An example of an aluminum alloy material for printing plates according to the present invention will be described.

Examples Table 1 shows Examples 1 to 6 and Comparative Examples 1 to 6 of aluminum alloy materials for printing plates according to the present invention, in which an organic/non-organic mixture coating layer was provided on a degreased aluminum material. The results of measuring the components and component ratios and hydrophilicity of the organic/inorganic mixture coating] η are shown.Comparative Examples 4 to 6 are conventional techniques. Examples 1 and 1 of aluminum alloy materials for printing plates according to
3 is a micrograph of the surface structure of Comparative Example 6.

Doki Akinori IJ Effect 1 1' no 1 Explained 5: Yu Seal Adllll of the Invention
The aluminum material for the friend has the composition shown below, but there are 7 aluminum alloys, 7 aluminum alloys, and 1 earth aluminum alloy.
The melon coating layer, which is an organic, undefeated mixture of a water-bathable acidic polymer substance and a silicate compound represented by a specific formula, provided on the surface of the aluminum alloy has a porous rough surface with excellent hydrophilicity. and
It does not require the skilled work of brush polishing, which is the conventional surface roughening method, and it also does not require an abrasive agent, aluminum dust removal work, or electrolytic etching process, and can save the $ required for offset printing plates by using only chemical etching. 111lii
It does not require a long time to form, and has the advantage of being steeply streamlined.

[Brief explanation of the drawing]

FIGS. 1(a) and 1(b) are micrographs showing the surface structures of aluminum alloy materials of Examples of the aluminum alloy materials for printing plates according to the present invention and Comparative Example 6. $11 pot

Claims (1)

[Claims] (1) One or more water-soluble organic polymer substances selected from styrene-maleic acid copolymer, polyacrylamide, butylene-maleic acid copolymer, polyacrylic acid, or their salts on the surface of aluminum or aluminum alloy. and a silicate compound represented by the following formula xM_2O・ySiO_2 (where M=Li, Na, K) (y/x≧2). Alloy material.