Composition for screen printing

 

(57) Abstract:

Use: manufacture of printed circuit boards, glass boards, indicators, marking panels. The inventive composition comprises, by wt.%: alkyd resin 25,0 - 27,0 (on dry matter), dibutyl phthalate and 1.0 - 3.0, Alcamo OS 2 - 0,1,0,3, white spirit and/or kerosene 10,0 - 18,0, monoalkyl ether glycol 0.1 to 0.3, triethanolammonium 1,0 - 5,0, barium sulfate else. The composition has a high resolution of topological drawing. table 1.

The invention relates to printing inks, in particular to a protective inks screen printing, designed for the manufacture of printed circuit boards, glass boards, indicators, marking panels.

Known protective paint screen printing for the manufacture of printed circuit boards (Shahverdyan B. N. Gagarinskaya L. A. Printing materials. M. Book, 1988, S. 211 217).

The disadvantages of these paints is their poor adhesion to the glass surface of the Board, the selectivity to the morphology and purity of the Board surface, high defect in quality of the applied layer.

The closest analogue-a prototype of the present invention is a paint composition comprising an alkyd resin, dibutil coomeva, ST3.12.X-51, T 29-02-740-87).

The disadvantages of this paint are insufficient reproducibility of the printing properties associated with the instability of its thixotropic parameters, and shallow (up to 200 to 250 microns) resolution.

In addition, when reducing the size of the topological elements of drawing and respectively mesh stencil you want to use a paint diluted with solvents. The process of applying this paint is difficult due to the instability of its structure and strong spreading. The latter circumstance makes it impossible to separate playback located with a minimum (about 100 to 150 microns) clearance items topological drawing.

The objective of the invention is to improve the printing properties of the ink and as a consequence an increased resolution of topological drawing.

The problem is solved in that in the known composition for screen printing, comprising alkyd resin based on phthalic anhydride and pentaerythritol, dibutyl phthalate, alkyl oxyethylenenitrilo the ammonium benzoylphenyl Alcamo OS-2, white spirit and/or kerosene, barium sulfate, added monoalkyl ether of polyethylene glycol of General formula2OH)3]+CmH2m+1COO-where m 14 17, in the following ratio, wt.

Alkyd resin 25,0 27,0

Dibutyl 1,0 3,0

Alcamo OS-2 0,1 0,3

White spirit and/or kerosene 10,0 18,0

Monoalkyl ether glycol 0,1 0,3

Triethanolamines 1,0 5,0

Barium sulfate Else

when the amount of alkyd resin to the solution.

With the introduction of surface-active monoalkyl ether of polyethylene glycol slows down the evaporation rate of ink in its operation, reduces its stickiness to the stencil and thereby improving the manufacturability of the process as a whole. The specified property change colors associated with the distribution of macromolecules surface-active monoalkyl ether of polyethylene glycol on the surface of the paint, preventing diffusion of the solvent molecules from the volume Kramskoy.

The introduction of a polar compound of triethanolaminato, such as triethanolaminato, causes the Association of the molecules of the foaming agent and as a consequence improves the thixotropy of the compositions as a whole. Due to the continuing thixotropy in the printing process significantly decreases the value of the effective flowing property of the paint, Thu is edlagaemoe technical solution to a problem is a new set of features in comparison with the known solutions of the problem, it is not obvious from the prior art and may be found to comply with the criterion of "inventive step". Part 1, wt.

Alkyd resin 25,0

Dibutyl 1,0

Alcamo OS-2 0,1

White spirit and/or kerosene fraction 10,0

Monoalkyl ether glycol 0,1

Triethanolaminato 1,0

Filler

Else

Part 2, wt.

Alkyd resin 26,0

Dibutyl 2,0

Alcamo OS-2 0,2

White spirit and/or kerosene fraction 14,0

Monoalkyl ether glycol 0,2

Triethanolaminato 3,0

Filler Rest

Part 3, wt.

Alkyd resin 27,0

Dibutyl 3,0

Alcamo OS-2 0,3

White spirit and/or kerosene fraction 18,0

Monoalkyl ether glycol 0,3

Triethanolaminato 5,0

Filler Rest

The best is the paint composition for screen printing at the following content, wt.

Alkyd resin 26,0

Dibutyl 2,0

Alcamo OS-2 0,2

White spirit and/or kerosene fraction 14,0

Monoalkyl ether glycol 0,2

Triethanolaminato 2,0

Filling The Rest.

The table is developed based paint is superior to known printing properties, largest adhesion and surface charge, stability, rheological characteristics.

It allows you to get high-saturated thin PCB components in positive performance.

Protective paint is applied through the stencil form on the surface of a glass Board, covered with a thin continuous layer of indium oxide or tin dioxide, or a mixture of indium and tin oxides) formed by vacuum deposition. Then hounded, dissolve unprotected areas of the layer of indium oxide in hydrochloric acid. After that, the protective paint is removed in alkaline solution. Remaining on the Board surface plots of oxide are given topological conductive structure.

The paint is prepared on the basis of commercially available electroplating protective paint ST3.12-51 (TU 29-02-740-78). In 100 g of paint is added 8 10 g monoalkyl ether of ethylene glycol (00-20, GOST 19730) and 1.2 g of triethanolaminato. After a thorough mechanical mixing for 10 to 15 min the protective paint is ready for use.

Composition for screen printing, comprising alkyd resin based on phthalic anhydride and pentaerythritol, dibutyl phthalate, alkyloxyaryl-metal is then further comprises monoalkyl ether of polyethylene glycol of General formula C18H34- (O-CH2-CH2)nIs HE, where n 15 30, and triethanolamines General formula

[HN(CH2CH2OH)3]+CmH2m+1COO-,

where m 14 17,

in the following ratio, wt.

Alkyd resin (dry substance) 25 27

Dibutyl phthalate 1 3

Alcamo OS-2 0,1 0,3

White spirit and/or kerosene 10 18

Monoalkyl ether glycol 0,1 0,3

Triethanolammonium 1 5

Barium sulfate Ostalnoe

 

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,

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