CN112552737A - Offset printing powder-spraying-free ink - Google Patents

Abstract

The invention provides offset printing powder-spraying-free ink which comprises rosin modified phenolic resin, non-aromatic mineral oil, alkyd resin, linseed oil, soybean oil, polyethylene wax and organic pigment. The invention has the beneficial effects that: the vegetable oil is used for replacing a mineral oil solvent, the purpose of environmental protection can be achieved, and the vegetable ink has no polycyclic aromatic hydrocarbon compound content, no VOC (volatile organic Compounds) emission, no environmental pollution and contribution to the health of manufacturing and users.

Description

Offset printing powder-spraying-free ink

Technical Field

The invention relates to the field of printing ink, in particular to offset printing powder-spraying-free printing ink.

Background

The offset printing ink is composed of resin, pigment, auxiliary agent and solvent, wherein the solvent uses mineral oil (petroleum solvent), VOC in the petroleum solvent can generate photochemical smog to pollute the atmosphere, and in order to prevent the atmospheric pollution, the representative standard is to popularize the printing ink without fragrance, namely to remove aromatic components harmful to human bodies in the petroleum solvent, such as toluene, xylene, ethylbenzene and the like;

conventional UV inks are not suitable for VOC ingredients, but also present waste paper recycling problems.

Disclosure of Invention

The invention overcomes the defects in the prior art and provides offset printing powder-free ink.

The purpose of the invention is realized by the following technical scheme.

The offset printing powder-spraying-free ink comprises rosin modified phenolic resin, aromatic hydrocarbon-free mineral oil, alkyd resin, linseed oil, soybean oil, polyethylene wax and organic pigment.

Preferably, the weight parts of the components are as follows:

preferably, in any of the above embodiments, the acid value of the rosin-modified phenol resin is 10 to 30 mgKOH/g.

Preferably, the acid value of the alkyd resin oil is less than or equal to 20mgKOH/g, and the viscosity at 25 ℃ is 15000-25000 mpa.s.

Preferably, in any of the above embodiments, the rosin-modified phenolic resin is a flexographic ink resin, and is a polymer product produced by a chemical reaction of alkylphenol, formaldehyde, polyol and rosin.

Preferably, in any of the above embodiments, the alkylphenol is any one of phenol, bisphenol A, PTBP p-tert-butylphenol, POP p-tert-octylphenol, PNP nonylphenol, and PDDP dodecylphenol.

A preparation method of offset printing powder-spraying-free ink comprises the following steps:

step one, adding linseed oil and soybean oil into a reaction kettle according to a formula, and heating;

step two, heating to the temperature of 170-190 ℃, adding the rosin modified phenolic resin, the non-aromatic hydrocarbon mineral oil, the alkyd resin, the polyethylene wax and the organic pigment for 2-5 times, and continuing heating;

and step three, raising the temperature to 180-220 ℃, and introducing inert gas to the surface in the temperature raising process for stirring.

The invention has the beneficial effects that:

the ink prepared by the scheme has the advantages of high softening point, high viscosity, high solubility, high molecular weight and the like, the single-sheet offset printing ink prepared by the scheme can meet the printing use requirements, and the ink added with the rosin modified phenolic resin is greatly improved in multiple physical and chemical properties;

the acid value of the rosin modified phenolic resin is 10-30mgKOH/g, and the resin with the acid value within the range is used for the drying performance of the soybean oil offset printing ink;

the vegetable oil is used for replacing a mineral oil solvent, the purpose of environmental protection can be achieved, and the vegetable ink has no polycyclic aromatic hydrocarbon compound content, no VOC (volatile organic Compounds) emission, no environmental pollution and contribution to the health of manufacturing and users.

The powder-spraying-free printing ink composition can be directly used for printing without adding any auxiliary material, and powder spraying is not needed after printing to prevent sticking.

Detailed Description

The technical solution of the present invention is further illustrated by the following specific examples.

Composition of ink for offset printing and no powder spraying

The offset printing powder-spraying-free ink comprises rosin modified phenolic resin, aromatic hydrocarbon-free mineral oil, alkyd resin, linseed oil, soybean oil, polyethylene wax and organic pigment.

The alkyd resin has good color retention, good brightness and excellent adhesion in the printing ink, has higher solid content and lower viscosity, and fundamentally and effectively reduces the VOC content, so that the alkyd resin coating has the advantages of environmental protection, no toxicity and good market reaction while ensuring high performance;

the soybean oil has a small quantity of double bonds in a molecular structure, belongs to semi-dry vegetable oil, has a slow oxidation drying speed, and the acid value of the resin directly influences the fluidity of the ink, so that when the acid value of the rosin modified phenolic resin is 10-30mgKOH/g, the ink has the best dryness.

The acid value of the alkyd resin oil is less than or equal to 20mgKOH/g, and the viscosity at 25 ℃ is 15000-25000 mpa.s.

The addition of the polyethylene wax in the ink can change the fluidity of the ink, reduce the viscosity of a system and improve the smoothness, the wear resistance and the scratch resistance of the ink; can also improve the new water-based property, accelerate the fixation and make the printing product net point complete; meanwhile, the defects of caking, hair plucking, smearing and the like are reduced; the printing performance of the ink is improved; the polyethylene wax can be added into the ink in three ways of dispersing by an organic solvent, emulsifying by water and preparing into micro powder with proper particle size.

The rosin modified phenolic resin is offset printing ink resin, and is a high molecular product generated by chemical reaction of alkylphenol, formaldehyde, polyalcohol and rosin.

The alkylphenol is any one of phenol, bisphenol A, PTBP p-tert-butylphenol, POP p-tert-octylphenol, PNP nonylphenol and PDDP dodecylphenol.

Example 1

The offset printing powder-spraying-free ink comprises rosin modified phenolic resin, aromatic hydrocarbon-free mineral oil, alkyd resin, linseed oil, soybean oil, polyethylene wax and organic pigment;

the weight parts of the components are as follows:

example 2

The offset printing powder-spraying-free ink comprises rosin modified phenolic resin, aromatic hydrocarbon-free mineral oil, alkyd resin, linseed oil, soybean oil, polyethylene wax and organic pigment;

example 3

The offset printing powder-spraying-free ink comprises rosin modified phenolic resin, aromatic hydrocarbon-free mineral oil, alkyd resin, linseed oil, soybean oil, polyethylene wax and organic pigment;

second, preparation method of offset printing powder-spraying-free ink

The preparation method of the offset printing powder-spraying-free ink comprises the following steps:

step one, adding linseed oil and soybean oil into a reaction kettle according to a formula, and heating;

step two, heating to the temperature of 170-190 ℃, adding the rosin modified phenolic resin, the non-aromatic hydrocarbon mineral oil, the alkyd resin, the polyethylene wax and the organic pigment for 2-5 times, and continuing heating;

step three, the temperature is increased to 180 ℃ and 220 ℃, inert gas is introduced into the surface in the temperature increasing process, and stirring is carried out

The above-mentioned 3 embodiments of the present invention have been described in detail, but the above-mentioned contents are only preferred embodiments of the present invention, and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.

Claims (7)

1. The offset printing powder-spraying-free ink is characterized in that: comprises rosin modified phenolic resin, non-aromatic mineral oil, alkyd resin, linseed oil, soybean oil, polyethylene wax and organic pigment.

2. The offset powder-free ink of claim 2, wherein: the weight parts of the components are as follows:

3. the offset powder-free ink of claim 2, wherein: the acid value of the rosin modified phenolic resin is 10-30 mgKOH/g.

4. The offset powder-free ink of claim 2, wherein: the acid value of the alkyd resin oil is less than or equal to 20mgKOH/g, and the viscosity at 25 ℃ is 15000-25000 mpa.s.

5. The offset powder-free ink of claim 3, wherein: the rosin modified phenolic resin is offset printing ink resin, and is a high molecular product generated by chemical reaction of alkylphenol, formaldehyde, polyalcohol and rosin.

6. The offset powder-free ink of claim 4, wherein: the alkylphenol is any one of phenol, bisphenol A, PTBP p-tert-butylphenol, POP p-tert-octylphenol, PNP nonylphenol and PDDP dodecylphenol.

7. A preparation method of offset printing powder-spraying-free ink is characterized by comprising the following steps: the method comprises the following steps:

step one, adding linseed oil and soybean oil into a reaction kettle according to a formula, and heating;

step two, heating to the temperature of 170-190 ℃, adding the rosin modified phenolic resin, the non-aromatic hydrocarbon mineral oil, the alkyd resin, the polyethylene wax and the organic pigment for 2-5 times, and continuing heating;

and step three, raising the temperature to 180-220 ℃, and introducing inert gas to the surface in the temperature raising process for stirring.