Composition for removing photochemically polyvinyl alcohol-base tanned layer from printing form

FIELD: polygraphic, electronic and radiotechnical industry.

SUBSTANCE: invention proposes a polyvinyl alcohol-base oxidizing composition for removal of tanned polymeric layer that comprises the following components, wt.-%: sodium or potassium metaperiodate or sodium or potassium dihydro-ortho-periodate, 20-70; magnesium or calcium, or aluminum salt or salts, 20-70, and one or more crystalline organic acids, 5-50. Invention provides enhancing effectiveness of regeneration of net-stencil printing screens and to improve retention of oxidizing compositions. Invention is used for regeneration of netted-stencil printing screens prepared with use of photoresist materials.

EFFECT: improved and valuable properties of composition.

20 ex

 

The invention relates to the compositions for regeneration setcategoryid print screens obtained using photoresists, and can be used in printing, electronic and radio industries.

In screen printing, there is a need for regeneration of the mesh screen printing plate, that is, removal of the previous figure with a stretched frame grid with a view to its reuse. This problem is particularly acute in relatively small print runs, when the grid is necessary to put a new picture after printing is relatively small (a few hundred) of the printing copies. Since the screen grid are to expensive consumables, it is advisable to complete removal of the previous figure with used screen printing plate and then apply a new pattern.

Regeneration of the mesh is particularly easy in the case of copying layers on the basis of polyvinyl alcohol (PVA), since this polymer is able to easily undergo degradation under the action of a number of strong oxidizing agents.

A known method of removing the protective layer on the basis of PVA with such strong oxidizing agents like sodium hypochlorite and calcium [1]. These agents are very aggressive, corrosive and unstable substances with sharp nebria the major smell. In addition, they are not effectively remove the protective layer and do not provide a complete cleansing grid of traces of polymer coating.

Several patents describe the use of removal of photochemically zagublennyh layers on the basis of the PVA aqueous solutions of metaperiodate sodium or potassium, as well as ortho-iodine acid [2-4].

The closest to the claimed object are compositions containing 0.35 to 5.0 wt.% metaperiodate potassium (sodium) or ortho-iodine acid in water, which may also contain sodium tripolyphosphate, sodium hypochlorite, sodium dichloroisocyanurate or the disodium salt of N,N,N',N′-ethylenediaminetetraacetic acid (Trilon B) [4]. Processing zagubinoga layer on the basis of PVA these solutions is carried out, depending on the concentration of periodate, within 1-2 minutes, after which the softened layer is cleaned with a brush.

The drawbacks of such compositions are low removal efficiency of photochemically zagubinoga layer on the basis of the PVA education in printed form traces remote zagubinoga layer (so-called "shadow images") and the need in this regard to use increased to 5.0 wt.% concentration expensive periodate, as well as the rapid loss of activity of the solution during storage.

The purpose of the invention is the efficiency (quality and speed of treatment with the TCA) regeneration setcategoryid print screens improved persistence of songs.

This objective is achieved in that the following composition is a mixture of dry, finely ground components taken in the following ratio, wt.%:

metaperiodate sodium or potassium
or dihydroartemisinin sodium or potassium20-70
salt or salts of magnesium, or calcium, or aluminum20-70
crystalline organic acid
or a mixture of crystalline organic acids5-50

The composition of the composition is stable during storage, dissolve easily in water, forming a homogeneous solution with a pH of 1-3. Due to the high oxidative activity periodate in more acidic compared to the prototype environment and the presence of magnesium ions, calcium and aluminum, or a mixture thereof, to facilitate the dissolution of the PVA removal of the protective layer with a mesh stencil compared to the prototype is 1.5-2.0 times faster and better, not requiring high concentrations of periodate, and machining the softened layer.

The required value of the pH of the aqueous working solution is created through the use of acid or hydrolyzable salts polivalent the x metals and the introduction of organic acids.

In the present invention, the dry composition does not lose its activity within 1.5 to 2.0 years in contrast to liquid compositions specified in the prototype, having a shelf life of not more than 6 months.

The invention is illustrated by the following examples.

Example 1 (prototype).

An aqueous solution containing 0.4 g of metaperiodate potassium, 0.4 g of sodium tripolyphosphate, and 100 ml of water, treated with both sides of the mesh screen with a pattern, made using the emulsion FRI (TU 2378-025-13271746-06) on the basis of polyvinyl alcohol applied according to the technical instructions on the rules of application.

Within 2 minutes there is a softening of the protective layer, after which it is removed by the jet of water at high (50-60 ATM) pressure.

When considering the transmitted light on the grid visible light traces of a still picture as a translucent outline.

These traces are removed after repeated specified cleaning procedures.

Example 2.

Prepare a mixture of finely ground powders of sodium metaperiodate (40 wt%), magnesium dihydrophosphate (30 wt.%) and succinic acid (30 wt%). 20 g of the obtained mixture was dissolved in 1 l of deionized water and get a clear solution with a pH of 3.

Prepared by the solution process on both sides of the mesh screen picture made with ISOE what Itanium emulsion FRI (TU 2378-025-13271746-06) on the basis of polyvinyl alcohol applied according to the technical instructions on the rules of application.

Within 2 minutes there is a softening of the protective layer, after which it is removed by a stream of water with high (50-60 ATM) pressure.

Get a clean mesh, suitable for re-use.

Example 3.

Prepare a mixture of finely ground powders of sodium metaperiodate (40 wt%), magnesium dihydrophosphate (20 wt.%) and succinic acid (40 wt%). 25 g of the obtained mixture was dissolved in 1 l of deionized water and get a clear solution with a pH of 2.5. Treated with the prepared solution mesh stencil as described in example 2. Softening the protective layer should be performed within 1 minute, after which it is removed by a stream of water with high (50-60 ATM) pressure.

Get a clean mesh, suitable for re-use.

Example 4.

Prepare a mixture of finely ground powders of sodium metaperiodate (70 wt%), magnesium dihydrophosphate (20 wt.%) and succinic acid (10 wt.%). 30 g of the obtained mixture was dissolved in 1 l of deionized water and get a clear solution with a pH of 3.

Treated with the prepared solution mesh stencil as described in example 2. Softening the protective layer should be performed within 2 minutes, after which it is removed by a stream of water with high (50-60 ATM) pressure.

Get a clean mesh, suitable for re-use.

Example 5.

Prepare a mixture of finely ground powders of sodium is metaperiodate (30 wt%), magnesium dihydrophosphate (30 wt%), succinic acid (30 wt.%) and adipic acid (10 wt.%). 30 g of the obtained mixture was dissolved in 1 l of deionized water and get a slightly opalescent solution with a pH of 2.5.

Treated with the prepared solution mesh stencil as described in example 2. Softening the protective layer should be performed within 1 minute, after which it is removed by a stream of water with high (50-60 ATM) pressure.

Get a clean mesh, suitable for re-use.

Example 6.

Prepare a mixture of finely ground powders of sodium metaperiodate (20 wt%), aluminum sulfate (70 wt.%) and succinic acid (10 wt.%) 40 g of the obtained mixture was dissolved in 1 l of deionized water and get a clear solution with a pH of 2.0.

Treated with the prepared solution mesh stencil as described in example 2. Softening the protective layer should be performed within 1 minute, after which it is removed by a stream of water with high (50-60 ATM) pressure.

Get a clean mesh, suitable for re-use.

Example 7.

Prepare a mixture of finely ground powders of potassium metaperiodate (30 wt%), magnesium dihydrophosphate (30 wt%), succinic acid (40 wt%). 25 g of the obtained mixture was dissolved in 1 l of deionized water and get a slightly opalescent solution with a pH of 2.5.

Treated with the prepared solution net Tr is faret, as indicated in example 2. Softening the protective layer should be performed within 2 minutes, after which it is removed by a stream of water with high (50-60 ATM) pressure.

Get a clean mesh, suitable for re-use.

Example 8.

Prepare a mixture of finely ground powders of sodium dihydroorotate (25 wt%), aluminum sulfate (35 wt.%) and succinic acid (40 wt%). 40 g of the obtained mixture was dissolved in 1 l of deionized water and get a clear solution with a pH of 3.0.

Treated with the prepared solution mesh stencil as described in example 2. Softening the protective layer should be performed within 2 minutes, after which it is removed by a stream of water with high (50-60 ATM) pressure.

Get a clean mesh, suitable for re-use.

Example 9.

Prepare a mixture of finely ground powders of sodium metaperiodate (30 wt%), calcium chloride (20 wt.%) and succinic acid (50 wt.%). 30 g of the obtained mixture was dissolved in 1 l of deionized water and get a clear solution with a pH of 2.0.

Treated with the prepared solution mesh stencil as described in example 2. Softening the protective layer should be performed within 1 minute, after which it is removed by a stream of water with high (50-60 ATM) pressure.

Get a clean mesh, suitable for re-use.

Example 10.

Prepare a mixture of tonko melcene powders of sodium metaperiodate (30 wt%), magnesium dihydrophosphate (65 wt.%) and trichloroacetic acid (5 wt%). 30 g of the obtained mixture was dissolved in 1 l of deionized water and get a clear solution with a pH of 1.0.

Treated with the prepared solution mesh stencil as described in example 2. Softening the protective layer should be performed within 1 minute, after which it is removed by a stream of water with high (50-60 ATM) pressure.

Get a clean mesh, suitable for re-use.

Example 11.

Prepare a mixture of finely ground powders of sodium metaperiodate (35 wt%), magnesium dihydrophosphate (10 wt%), aluminum sulfate (15 wt%), succinic acid (30 wt.%) and glutaric acid (10 wt.%).

40 g of the obtained mixture was dissolved in 1 l of deionized water and get a clear solution with a pH of 3.0.

Treated with the prepared solution mesh stencil as described in example 2. Softening the protective layer is carried out in a period of 1.5 minutes, after which it is removed by a stream of water with high (50-60 ATM) pressure.

Get a clean mesh, suitable for re-use.

Example 12.

Prepare a mixture of finely ground powders of potassium dihydroorotate (30 wt%), calcium chloride (10 wt%), magnesium dihydrophosphate (15 wt%), succinic acid (25 wt.%) and trichloroacetic acid (20 wt.%).

30 g of the obtained mixture was dissolved in 1 l of deionized in the water and get a clear solution with a pH of 2.8.

Treated with the prepared solution mesh stencil as described in example 2.

Softening the protective layer should be performed within 2 minutes, after which it is removed by a stream of water with high (50-60 ATM) pressure.

Get a clean mesh, suitable for re-use.

Example 13.

Differs from example 2 in that instead of magnesium dihydrophosphate (30 wt.%) use an equal amount of magnesium acetate.

Example 14.

Differs from example 2 in that instead of magnesium dihydrophosphate (30 wt.%) use equal amounts of magnesium chloride.

Example 15.

Differs from example 2 in that instead of magnesium dihydrophosphate (30 wt.%) use an equal amount of magnesium acetate.

Example 16.

Differs from example 6 in that instead of aluminum sulfate (70 wt.%) use an equal amount of potassium alum.

Example 17.

Differs from example 6 in that instead of aluminum sulfate (70 wt.%) use an equal amount of aluminum dihydroorotate.

Example 18.

Differs from example 6 in that instead of aluminum sulfate (70 wt.%) use an equal amount of aluminum nitrate.

Example 19.

Differs from example 9 that instead of calcium chloride (20 wt.%) use equal amounts of calcium acetate.

Example 20.

Differs from example 9 that instead of calc what I chloride (20 wt.%) use equal amounts of calcium nitrate.

Sources of information

1. Pat. U.S. No. 4789621, NCI 430/283 .1, publ. 06.12.1988,

2. Pat. U.S. No. 3793035, NCI 96/36 .1, publ. 19.02.1974,

3. Pat. U.S. No. 6333137, NCI 430/287 .1, publ. 25.12.2001,

4. Pat. UK No. 1375402, NCI G2X, publ. 27.11.1974,

Oxidizing composition to be deleted from the mesh screen printed forms zagubinoga polymer layer based on polyvinyl alcohol, including periodic alkali metal and an organic acid, characterized in that as periodate alkali metal it contains metaperiodate sodium or potassium, or dihydroartemisinin sodium or potassium, when this composition is a mixture of dry, finely ground components taken in the following ratio, wt.%:

metaperiodate sodium or potassium
or dihydroartemisinin sodium or potassium20-70
salt, or magnesium salt, or calcium, or aluminum20-70
crystalline organic acid
or a mixture of crystalline organic acids5-50



 

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