CN104231738B - Pure water type cork paper gravure black ink and preparation method thereof - Google Patents

Abstract

The invention relates to a gravure black ink for pure water-type tipping paper and a preparation method thereof, belonging to the technical field of packaging and printing. The ink includes the following composition and weight ratio: 21-26 parts of carbon black, 33-37 parts of water-based acrylic resin, 35-40 parts of deionized water, 1-2 parts of defoaming agent, 1-2 parts of dispersant and surface Active agent 0.5～1.5 parts. The present invention uses deionized water as a solvent without using any organic solvents, reducing the pollution to the atmospheric environment, only diluting with deionized water in printing, and using shallow printing, which reduces costs, is safe and environmentally friendly, and the safety index VOC detection meets National standard GB/T 26395‑2011, heavy metal detection complies with EN71‑3. The ink of the invention has simple production process, good leveling property, printing speed range of 100-200m/min, and good printing suitability and printing performance.

Description

Gravure black ink for pure water type tipping paper and preparation method thereof

technical field

The invention relates to a gravure black ink for pure water type tipping paper and a preparation method thereof. The ink is a gravure printing ink and belongs to the technical field of packaging and printing.

Background technique

Tipping paper, commonly known as tipping paper, is a cigarette packaging material used as the outer packaging of cigarette filter rods. It belongs to special industrial paper. It is usually printed from white tipping base paper. At present, the inks used by many tipping paper printing factories are mostly alcohol-soluble and ester-soluble inks. These ink components contain a large amount of volatile organic solvents, which not only pollute the atmospheric environment, but also use this type of ink to print water. After the paper is loosened, a certain amount of volatile organic solvents will remain on the surface of the tipping paper, which is harmful to human health. With the improvement of people's awareness of environmental protection and the awareness of the safety of the products used, printing inks for tipping paper must be non-toxic and meet food hygiene standards. Therefore, it is imperative to produce environmentally friendly water-based inks that do not contain volatile organic solvents. Row.

Contents of the invention

The object of the present invention is to provide a kind of gravure black ink for pure water type tipping paper and its production method, this ink does not use organic solvent, is pure water type ink, safe, nontoxic, hygienic, environmental protection. Pure water type tipping paper gravure black ink adopts gravure printing method, used for tipping paper printing, the ink has good leveling property and fast drying speed, and its printing speed ranges from 100 to 200m/min. Print quality is good and production costs are low. The safety index VOC detection complies with the national standard GB/T 26395-2011, and the heavy metal detection complies with EN71-3, which can meet the food safety and hygiene standards. Alternative to solvent-based inks for tipping paper printing.

In order to achieve the above object, the present invention takes the following technical solutions:

A gravure black ink for pure water-type tipping paper, which is prepared by mixing carbon black, resin, deionized water, and additives, and includes the following composition and weight ratio: 21-26 parts of carbon black, water-based acrylic resin 33-37 parts, 35-40 parts of deionized water, 1-2 parts of defoamer, 1-2 parts of dispersant and 0.5-1.5 parts of surfactant.

Preferably, the components and weight ratio of the ink are: 23-25 parts of carbon black, 34-36 parts of water-based acrylic resin, 36-38 parts of deionized water, 1.3-1.7 parts of defoaming agent, and 1.3-1.7 parts of dispersant And surfactant 0.8～1.2 parts.

Carbon black has smaller particle size, higher content of oxygen-containing groups and lower oil absorption, higher blackness and stronger tinting strength, higher gloss and better wettability, lower The characteristics of high viscosity and large fluidity.

The water-based acrylic resin is the s-2916 resin produced by Dongfang Yakeli Co., Ltd., which has good wettability to carbon black through modification, and has good wear resistance and film-forming property, and can Satisfy the grinding performance and film-forming performance of the ink, and use the ink containing s-2916 resin to print on the tipping paper, which can significantly improve the drying speed and adhesion fastness of the ink.

The defoamer is polyether siloxane copolymer.

The dispersant is an aqueous solution of a copolymer containing a pigment affinity group, and the concentration, that is, the content of active matter is 40% by weight.

The surfactant is polysiloxane-polyether copolymer.

The preparation method of above-mentioned pure water type plastic gravure black printing ink, comprises the steps:

(1) Mix carbon black, water-based acrylic resin, deionized water, defoamer, dispersant and surfactant according to the ratio, stir with a mechanical mixer to make it evenly mixed, and then pour it into a sand mill In the machine cavity, use a sand mill to grind and disperse until the particle size is less than or equal to 2 microns, then stop grinding;

(2) Send the dispersed samples to the inspection room to test the various indicators and performance of the ink, filter and pack after passing the inspection.

In step (1), the stirring time of the ink is 20-60 min, and the stirring speed is 400-600 r/min; the grinding time is 30-120 min, and the grinding speed is 1800-2000 r/min.

Carbon black mainly plays the role of color development in the ink. Water-based acrylic resin is one of the main components in the ink, which plays the role of dispersing carbon black, and makes the ink form a uniform thin layer after printing, and forms a film with a certain strength after drying. Layer, which protects the pigment and makes it difficult to peel off. The dispersant is a surfactant, which can reduce the interfacial tension between liquid/solid, enhance the lyophilicity of the pigment, and improve the efficiency of mechanical grinding, and the dispersant is adsorbed on the surface of the pigment to form a charge effect or a steric hindrance effect, preventing carbon black Flocculation and sedimentation keep the ink in a stable state. Since the ink is an alkaline system, it is easy to generate bubbles during mechanical stirring and grinding, which affects the efficiency and effect of grinding, so a defoamer should be added to the ink system. When printing, the surface tension of the ink is required to be lower than that of the tipping paper, so that the ink has better wettability and adhesion to the tipping paper, so it is necessary to add a surfactant to reduce the surface tension of the ink system.

The ink of the present invention has good printability, its particle size is 0.5-2 μm, and its viscosity is 10-20s when tested with 3 ^# Cai En cup.

The ink of the invention has good printing quality, and the products printed with the ink are bright in color, high in gloss and good in leveling, and the printing speed ranges from 100 to 200m/min.

The ink of the present invention uses gravure shallow plate printing, which can save 1/4-1/3 (weight) of the ink consumption.

The resin used in the present invention is a water-soluble resin, which has better solubility in water and better wettability to pigments. Moreover, the present invention uses deionized water as a solvent, does not use any organic solvents, reduces pollution to the atmospheric environment, and only dilutes with deionized water in printing, and uses shallow printing to reduce costs, safety and environmental protection, and safety index VOC detection It complies with the national standard GB/T 26395-2011, and the heavy metal detection complies with EN71-3. The gravure black ink for pure water-type tipping paper produced by the invention is suitable for gravure printing. The production process of the ink is simple, the leveling property is good, the printing speed can reach 100-200m/min, and the printing suitability and printing performance are good. One of the most common problems with general water-based inks is that the drying speed is very slow (such as 50-60m/min), which cannot meet the requirements of printing machines. And the present invention solves this problem well through the combination of raw materials and counterweight.

detailed description

The following embodiments further explain and illustrate the present invention, but do not constitute any limitation to the present invention. The parts stated in the following examples are by weight. In the following examples, the mechanical stirring speed of the ink is controlled between 400-600 r/min; the grinding speed is controlled between 1800-2000 r/min.

Example 1

Take 21 parts of carbon black, 35 parts of s-2916 resin (Oriental Yakeli Company), 40 parts of deionized water, 1.5 parts of polyether siloxane copolymer (content 100wt.%), 2 parts of pigment-containing Aqueous copolymer solution of affinity group (concentration: 40wt.%), 0.5 parts of polysiloxane-polyether copolymer (content: 100wt.%). Pour the above components into the mixing device, stir with a mechanical mixer for 30 minutes to mix them evenly, then pour them into the grinding chamber of a sand mill, grind and disperse them with a sand mill for 100 minutes, and test their particle size, the particle size is less than or equal to 2 microns , stop grinding, if the particle size is greater than 2 microns, continue grinding until the particle size is less than or equal to 2 microns; then test the indicators and properties of the ink, filter and pack after passing the test, and obtain the ink.

Example 2

Take 26 parts of carbon black, 33 parts of s-2916 resin, 37.5 parts of deionized water, 1 part of polyether siloxane copolymer, 1.5 parts of aqueous solution of copolymer containing pigment affinity groups (concentration is 40wt. %), 1 part polysiloxane-polyether copolymer. Pour the above components into the mixing device, stir with a mechanical mixer for 45 minutes to mix them evenly, then pour them into the grinding chamber of a sand mill, grind and disperse them with a sand mill for 90 minutes, and test their particle size, the particle size is less than or equal to 2 microns , stop grinding, if the particle size is greater than 2 microns, continue grinding until the particle size is less than or equal to 2 microns; then test the indicators and properties of the ink, filter and pack after passing the test, and obtain the ink.

Example 3

Take 23.5 parts of carbon black, 37 parts of s-2916 resin, 35 parts of deionized water, 2 parts of polyether siloxane copolymer, 1 part of aqueous solution of copolymer containing pigment affinity group (concentration is 40wt. %), 1.5 parts of polysiloxane-polyether copolymer. Pour the above components into the mixing device, stir with a mechanical mixer for 45 minutes to mix them evenly, then pour them into the grinding chamber of a sand mill, grind and disperse them with a sand mill for 90 minutes, and test their particle size, the particle size is less than or equal to 2 microns , stop grinding, if the particle size is greater than 2 microns, continue grinding until the particle size is less than or equal to 2 microns; then test the indicators and properties of the ink, filter and pack after passing the test, and obtain the ink.

Example 4

Take 23 parts of carbon black, 35 parts of s-2916 resin, 38 parts of deionized water, 1.3 parts of polyether siloxane copolymer, 1.5 parts of aqueous solution of copolymer containing pigment affinity group (concentration is 40wt. %), 1.2 parts of polysiloxane-polyether copolymer. Pour the above components into the mixing device, stir with a mechanical mixer for 45 minutes to mix them evenly, then pour them into the grinding chamber of a sand mill, grind and disperse them with a sand mill for 90 minutes, and test their particle size, the particle size is less than or equal to 2 microns , stop grinding, if the particle size is greater than 2 microns, continue grinding until the particle size is less than or equal to 2 microns; then test the indicators and properties of the ink, filter and pack after passing the test, and obtain the ink.

Example 5

Take 25 parts of carbon black, 34 parts of s-2916 resin, 37 parts of deionized water, 1.5 parts of polyether siloxane copolymer, 1.7 parts of aqueous solution of copolymer containing pigment affinity group (concentration is 40wt. %), 0.8 parts of polysiloxane-polyether copolymer. Pour the above components into the mixing device, stir with a mechanical mixer for 45 minutes to mix them evenly, then pour them into the grinding chamber of a sand mill, grind and disperse them with a sand mill for 90 minutes, and test their particle size, the particle size is less than or equal to 2 microns , stop grinding, if the particle size is greater than 2 microns, continue grinding until the particle size is less than or equal to 2 microns; then test the indicators and properties of the ink, filter and pack after passing the test, and obtain the ink.

Example 6

Take 24 parts of carbon black, 36 parts of s-2916 resin, 36 parts of deionized water, 1.7 parts of polyether siloxane copolymer, 1.3 parts of copolymer aqueous solution containing pigment affinity group (concentration is 40wt. %), 1 part polysiloxane-polyether copolymer. Pour the above components into the mixing device, stir with a mechanical mixer for 45 minutes to mix them evenly, then pour them into the grinding chamber of a sand mill, grind and disperse them with a sand mill for 90 minutes, and test their particle size, the particle size is less than or equal to 2 microns , stop grinding, if the particle size is greater than 2 microns, continue grinding until the particle size is less than or equal to 2 microns; then test the indicators and properties of the ink, filter and pack after passing the test, and obtain the ink.

Get the pure water type tipping paper ink produced in Examples 1-6 to carry out the printing performance test, and print on the tipping paper with the ink produced, test its printing quality.

The printing properties and printing quality indexes of the gravure black ink for pure water-type tipping paper obtained in the above examples are shown in Table 1.

Table 1

The ink of the invention has simple production process, good leveling property, and good printability and printing performance when the printing speed is between 100 and 200 m/min. Moreover, the cost is low, the pollution to the atmospheric environment is reduced, and it is safe and environmentally friendly. The safety index VOC detection complies with the national standard GB/T 26395-2011, and the heavy metal detection complies with EN71-3.

Claims (3)

1. A preparation method of gravure black ink for pure water type tipping paper, characterized in that: the ink is prepared from the following raw materials in weight ratio: 21 to 26 parts of carbon black, 33 to 37 parts of water-based acrylic resin , 35-40 parts of deionized water, 1-2 parts of defoamer, 1-2 parts of dispersant and 0.5-1.5 parts of surfactant; the water-based acrylic resin is s-2916 resin; the defoamer It is a polyether siloxane copolymer; the dispersant is an aqueous solution of a copolymer containing pigment affinity groups; the surfactant is a polysiloxane-polyether copolymer; Its preparation steps are as follows: (1) Weigh and mix carbon black, water-based acrylic resin, deionized water, defoamer, dispersant and surfactant according to the stated ratio, stir with a mechanical mixer to make it evenly mixed, and then pour it into the sand mill cavity Grind and disperse with a sand mill until the particle size is less than or equal to 2 microns, then stop grinding; (2) Send the dispersed samples to the inspection room to test the various indicators and performance of the ink, filter and pack after passing the inspection. 2. the preparation method of pure water type tipping paper gravure black ink according to claim 1 is characterized in that: the stirring rate in the described step (1) is 400～600r/min, and stirring time is 20～ 60min. 3. the preparation method of gravure black ink for pure water type tipping paper according to claim 2 is characterized in that: the grinding speed in the described step (1) is 1800～2000r/min, and the grinding time is 30～2000r/min. 120min.