SU755824A1 - Print for flexographic printing on polyolefin - Google Patents

Description

The invention relates to the field of printing industry, namely to the paint for flexographic printing on polyolefin.

The famous paint for flexographic printing on polyolefin-5, containing a binder - a mixture of 8-22 wt.%,

rosin-maleic resin with 1—

5% by weight of copolymer of hexamethylene diammonium adipate with e-caprolactam, 10–12% by weight of pigment, 25–70% by weight of organic solvent — aliphatic alcohol, nitrogenous base of di- or triethanolamine and water — the rest is And. ,five

The disadvantages of this paint are low adhesion to a non-activated polyethylene or polypropylene film not treated by a corona discharge (1 point on a five-point system); low resistance to abrasion (2 cycles on the device FDI-2); low scratch resistance (1 point on a five-point system).

The purpose of the invention is to increase the adhesion of adhesion, as well as resistance to pinpoint and abrasion.

This goal is achieved due to the fact that the well-known paint based (binder, pigment and water in the form of

The binder contains 10-40% aqueous dispersion of oxidized polyethylene with the following content of components, wt.%:

Binder 8-25

Pigment 8-12

Water Else.

The content in the printing ink as a binder water dispersion of oxidized polyethylene in water provides high adhesion of the paint film to the surface of untreated polyethylene or polypropylene (5 points on a five-point system), due to the formation of a large number of hydrogen bonds between the hydroxy and carboxyl groups of the oxidized polyethylene paint layer and hydrogen atoms on the surface of the polyolefin film, high abrasion resistance (up to 35 cycles of the PII-2 instrument) due to the formation of ink film; high scratch resistance (up to 5 points on a five-point system).

10-40% calculated on the dry residue of the dispersion of oxidized polyethylene in water is obtained by dispersing the composition of oxidized polyethylene

3

755824

four

in the presence of surfactants.

Nonionic (ethoxylated alcohols or ethoxylated polypropylene glycols) or cationic emulsifiers (mono-, di- and tertiary-quaternary ammonium salts or their mixture) are used as surfactants.

In the mixer load 70 weight.h. polyethylene oxidized wax,

20 wt.h, surfactants and 3-7 wt.h. shedding agent ’θ ta - triethanolamine. The composition is stirred in a mixer for 3 hours at 120 ° C, and then poured into water in small portions with stirring. The temperature of the water is maintained at 96 ° C. Depending on 15 on the ratio of water and composition, a 10–40% dispersion of oxidized polyethylene in water is obtained. The acid number of the dispersion of oxidized polyethylene 2 4. 20

Aqueous dispersion of oxidized polyethylene in water is a white, odorless liquid, resistant to alkalis, alcohols. Dispersion can withstand mechanical mixing in ball mills (attritors, bead mills), i.e. paints based on it are prepared in the usual way.

Alkali-resistant pigments, such as phthalocyanine, azo-pigments, titanium dioxide and carbon black, are used as pigments.

The ink may additionally contain ethyl or isopropyl alcohols or their mixture in any ratio up to 20 wt.% To increase the drying speed of the prints, and accordingly the printing speed and cellulose ether up to 5 wt. % dd

Example 1. The paint composition, wt.%:

25% based on

dry residue dis- Persia oxidized polyethylene in water 15 Pigment blue fta- LocianO / YOU B43U ten Water Rest

Prepare in an attritor (ball or bead mill) by loading all-50 pigment and water dispersion of oxidized polyethylene. The paint is dispersed to the degree of milling no more than 10 microns, after which water is added and stirred for 10 minutes. The resulting paint is filtered through a sieve of 4800–5200 holes / cm ^. Get a blue paint with a viscosity of 16 s VZ-4 at 20 ° C. For printing, the ink is diluted with water to a viscosity of 14 seconds. Example 2. Analogously to example 1, prepare the paint composition, wt.%:

10% based on dry residue dispersion of oxidized polyethylene in water 10 65

Phthalecyanin green pigment 8

Water Rest

Get green paint with a viscosity of 19 s VZ-4. . For printing, paint is diluted with water to a viscosity of 16 s.

Example 3. Analogously to example 1 prepare the paint composition, wt.%:

40% based on dry residue dispersion of oxidized polyethylene in water 25

Pigment yellow transparent "O" 10

Hydroxyethyl cellulose 3

Ethyl alcohol 10

Water Else.

Alcohol is loaded after loading the pigment with the remaining paint components. Hydroxyethylcellulose in the form of a 10% aqueous solution is injected before the stage of filtration of the paint.

A yellow paint with a viscosity of 26 s according to VZ-4 is obtained. For printing, dilute to a viscosity of 15 seconds.

Example 4. Analogously to example 1, prepare the paint composition, wt.%:

30% based on dry residue dispersion of oxidized polyethylene in water 8

Pigment bright red

4Ж 11

Ethyl alcohol 5

Isopropyl alcohol 10

Water Else.

Get a red paint with a viscosity of 18 s VZ-4. For printing, the ink is diluted with water to a viscosity of 15 seconds.

Example 5. Analogously to example 1, prepare paint composition, wt.%:

25% dispersion of oxidized polyethylene in water (calculated on the dry residue) 9

Orange pigment W 12

Water Rest

Get orange paint with viscosity

19 with on OT-4. For printing, the ink is diluted with water to a viscosity of 15 seconds.

This paint has good adhesion to polyolefin, and prints obtained when it is used have good scratch and abrasion resistance.

Claims (1)

Claim Paint for flexographic printing on polyolefin, containing a binder, pigment and water, characterized in that, in order to increase adhesion, as well as resistance to scratching and abrasion, it contains a 10-40% aqueous dis5 as a binder 755824 6 Persia oxidized polyethylene with the following content of components, wt.%: Binder 8-25 Pigment 8-12 Water Rest