CN115260825A

CN115260825A - UV offset printing black ink with printing bar code grade larger than 3.0 and preparation method thereof

Info

Publication number: CN115260825A
Application number: CN202211110346.8A
Authority: CN
Inventors: 陈银; 陈升; 陈椿生
Original assignee: Baosilong New Material Technology Longyan Co ltd
Current assignee: Baosilong New Material Technology Longyan Co ltd
Priority date: 2022-09-13
Filing date: 2022-09-13
Publication date: 2022-11-01

Abstract

The invention discloses UV offset printing black ink with a printing bar code grade of more than 3.0 and a preparation method thereof, and relates to the technical field of offset printing ink preparation. The UV offset black ink is added with trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, C.I. pigment black 7, C.I. pigment blue 61 and other substances, the water resistance and the transferability of the substances are utilized, various performances of the black ink are improved, meanwhile, the matching of the pigments ensures that the black degree is pure and the color is bright, the prepared offset black ink meets the relevant regulations of ' substances allowed to be used for cigarette materials ', and correspondingly meets the requirements of ' limited indexes of Volatile Organic Compounds (VOCS) in cigarette strips and box packing paper ' of the tobacco industry standard of the people's republic of China, the printing adaptability is good, the blackness and line definition of a printing bar code printed by the offset black ink are excellent, the decipherability of the printing bar code can be larger than 3.0, and the printing requirements of the tobacco industry and other industries needing high-quality printing bar codes are met.

Description

UV offset printing black ink with printing bar code grade larger than 3.0 and preparation method thereof

Technical Field

The invention relates to the technical field of offset printing ink preparation, in particular to UV offset printing black ink with a printing bar code grade of more than 3.0 and a preparation method thereof.

Background

Offset printing is the most important printing mode at present, and is characterized in that a fountain solution is required to be used in the printing process, so that offset printing ink is required to have good water resistance. The offset ink is resin bright quick-drying ink, mainly composed of coloring material, binder, adaptability regulator, drying regulator and regulator for improving printing effect.

At present, the bar code of the commodity is also printed by a mode of offset printing. The commodity bar code technology has become the essential settlement and information management means in commodity transaction at present, and the commodity bar code quality directly influences the operating efficiency and settlement fund safety of the POS system.

Therefore, how to ensure the printing quality and make the bar code print play a role in automatic identification becomes a problem of general attention, and unqualified bar code prints cannot bring good benefits to users and production enterprises, but can bring confusion. The scanning speed is influenced by the refusal of reading of the reading equipment, the working efficiency is reduced, and the input information error is caused, so that the economic loss is brought to producers and distributors.

According to the regulation of GB/T18348-2008, the grade of the decodable degree (V) is divided into 0-4 grades, and the higher the grade is, the higher the decodable degree is. However, the lower decipherability brings difficulty to recognition, so people are also researching how to improve the decipherability of the printed bar code.

For example, chinese patent No. CN108891130B discloses a barcode printing system, which includes an information input part for inputting a pattern to be printed, where the pattern includes a barcode to be printed; the printed matter input channel is used for providing printed matter required by a printing pattern; a print head that prints ink onto a print.

The bar code printing system can ensure that the width of the generated bar code is accurate, the quality of the bar code can be improved, but only by the printing system, the quality of the bar code which can be improved is limited, and even if the existing offset printing black ink is matched with the system, the printing requirements of cigarette label products or other bar codes with high decoding degree are difficult to achieve.

Disclosure of Invention

Aiming at the technical problems, the invention overcomes the defects of the prior art and provides UV offset printing black ink with the printing bar code grade of more than 3.0 and a preparation method thereof.

In order to solve the technical problems, the invention provides UV offset printing black ink with a printing bar code grade of more than 3.0 and a preparation method thereof.

The technical effects are as follows: the prepared offset black ink meets the relevant regulations of ' permitted use materials for cigarette materials ', correspondingly meets the requirements of ' limited indexes of Volatile Organic Compounds (VOCS) in cigarette strips and box packing paper ' of the tobacco industry standard of the people's republic of China, has good printability, has excellent blackness and line definition of printed bar codes printed by the offset black ink, can ensure that the decipherability of the printed bar codes is more than 3.0, and meets the printing requirements of the tobacco industry and other industries needing high-quality printed bar codes.

The invention further provides a technical scheme that the UV offset printing black ink with the printing bar code grade of more than 3.0 comprises the following components in parts by weight:

further, the plant carbon black is c.i. pigment black 7.

The UV offset black ink with the printing bar code grade of more than 3.0 is the basic blue pigment C.I pigment blue 61.

The preparation method of the UV offset black ink with the printed bar code grade being more than 3.0 comprises the following steps:

s1, according to production requirements, obtaining quantitative trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, a polymer of 4, 4' - (1-methylethylidene) diphenol, epichlorohydrin and acrylic acid, a polymer of a thioxanthone derivative, 2-benzyl-2-dimethylamino-1- (4-morpholinyl phenyl) butanone, a copolymer of methyl methacrylate and styrene, 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide, polyester resin, tripropylene glycol diacrylate and dipropylene glycol diacrylate, mixing and stirring the above materials for 2 hours, controlling the stirring temperature to be between 75 and 80 ℃, and uniformly stirring the materials to form a mixture;

s2, taking a certain amount of silicon dioxide, talcum powder, calcium carbonate, plant carbon black, polyethylene wax and basic blue pigment according to production requirements, adding the substances into the mixture prepared in the step S1, mixing and stirring for 1h, and controlling the stirring temperature to be between 50 and 60 ℃ to obtain a black ink semi-finished product;

and S3, grinding the black ink semi-finished product prepared in the step S2 to the fineness of less than or equal to 5 microns by using a hydraulic three-roller machine to obtain an offset black ink finished product, and packaging after the product is qualified.

The invention has the beneficial effects that:

(1) According to the invention, an excellent formula is used, different monomers are matched with proper auxiliaries and different prepolymers, so that the viscosity of the offset black ink is moderate, the fineness of the ink is small, the curing time is short, the friction performance is good, and meanwhile, a proper pigment is added, so that the offset black ink has pure blackness and bright color, has excellent fluidity and tinting strength, reduces the grinding times and improves the production efficiency;

(2) In the invention, the blackness and the line definition of the bar code prepared by printing with the black ink are excellent, the printing adaptability is good, the decodable degree of the printed bar code is more than 3.0, and even can reach the highest 4.0 grade, so the offset printing black ink prepared meets the relevant regulations of tobacco industry or other industries with higher requirements on the quality of the offset printing black ink, and correspondingly meets various indexes and requirements;

(3) According to the invention, the ethoxylated trimethylolpropane triacrylate is added into the formula, and the good water resistance and transferability of the ethoxylated trimethylolpropane triacrylate are utilized to play an important balance role in the drying property, the adhesive force and the diluting capacity of the printing ink, so that the printing effect and various performances of the offset black ink are greatly improved;

(4) According to the invention, the prepared offset printing black ink meets the relevant regulations of ' permitted use materials for tobacco materials ', correspondingly meets the requirements of ' limited indexes of Volatile Organic Compounds (VOCS) in cigarette strips and box packing paper ' of the tobacco industry standard of the people's republic of China, has good printability, has excellent blackness and line definition of the printed bar code printed by the offset printing black ink, can enable the decipherability of the printed bar code to be more than 3.0, and meets the printing requirements of the tobacco industry and other industries needing high-quality printed bar codes.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the following detailed description of the embodiments is provided. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms than those specifically described herein, and it will be apparent to those skilled in the art that many more modifications are possible without departing from the spirit and scope of the invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

The UV offset black ink with the printed barcode grade being greater than 3.0 provided by the embodiment comprises the following components in parts by weight:

the plant carbon black is c.i. pigment black 7, and the basic blue pigment is c.i. pigment blue 61.

The UV offset black ink is generally prepared from a prepolymer, a monomer, a photopolymerization initiator, a filler, a pigment and various auxiliaries, wherein the prepolymer is the part with the highest content in the UV ink, the curing speed, the printing adaptability and the ink film performance after printing of the ink are determined, the photocuring mechanism of the whole system is also determined, and the UV offset black ink has great influence on the flexibility, the emulsibility, the adhesion and the chemical resistance of the ink.

The monomer has low viscosity, and can play a role in adjusting the viscosity of the ink, thereby influencing the curing rate of the ink and the flexibility of the film layer. The photopolymerization initiator is an active group capable of absorbing energy, is an accelerator in the ink, and when the photopolymerization initiator is irradiated by UV light, molecules are activated and split into two or more free radicals, so that the whole chain photoreaction chain is driven, and the ink is polymerized and hardened to form a film.

The polyester resin is used as a prepolymer in the offset black ink, is an extremely good ink carrier, is safe and non-toxic, does not pollute the environment, and the UV offset black ink prepared based on the polyester resin has good water resistance and printing adaptability and strong cohesive force, and can improve various index requirements of the ink such as the emulsifying rate, the curing dryness, the dot reduction, the adhesive force, the fluidity and the like.

The monomer used in the invention is a mixture of trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate and tripropylene glycol diacrylate, and because the functionality of the monomer influences the performance of the ink to a great extent, a plurality of monomers with different functionalities are mixed for use, so that the monomer mixture has good balance, almost has no destructive effect on a rubber roller, has excellent dilutability, can reduce the overall viscosity of the photo-crosslinked ink, and improves the fluidity and the curing speed of the ink.

The ethoxylated trimethylolpropane triacrylate is added into the formula, and the good water resistance and transfer performance of the ethoxylated trimethylolpropane triacrylate play an important balance role in the aspects of drying property, adhesive force and diluting capacity of the printing ink, so that the printing effect and various performances of the offset black ink are improved to a great extent.

The photopolymerization initiator used in the invention is a mixture, and comprises a polymer of thioxanthone derivatives, a polymer of 4,4 ' - (1-methylethylidene) diphenol, epichlorohydrin and acrylic acid, 2-benzyl-2-dimethylamino-1- (4-morpholinyl phenyl) butanone, dipropylene glycol diacrylate and 2,4, 6-trimethylbenzoyl-diphenyl phosphine oxide, and a plurality of photoinitiators are used, so that energy photons can be obtained by different absorptions of a specific single ultraviolet spectrum, and further, the ' functional polymerization ' in a system is initiated to complete the drying and curing of the ink.

After multiple experiments, the photoinitiator with the formula component can improve the curing speed of the ink, reduce the printing smell after curing, is not easy to cause the phenomenon of poor dissolution and has good sensitization and absorption activity on ultraviolet rays with longer wavelength, can greatly relieve the reduction of the photocuring rate of the added pigment on the UV ink, and ensures the drying rate of the UV offset printing ink.

According to the invention, the talcum powder, the calcium carbonate and the silicon dioxide are added as the fillers, so that the printing ink has high integral density, stable structure and good adsorption effect, can be cured with polyester resin to form a film, has good integral dimensional stability and strong wear resistance, improves the friction resistance of the printing ink after application, has little influence on curing time and viscosity, and also improves the adhesive force of the printing ink after molding.

In addition, various auxiliary agents are added to improve various performances of the UV offset black ink, and the methyl methacrylate and styrene copolymer added as a modifier can enable the black ink to have good processing fluidity, improve the grinding efficiency of the black ink, and simultaneously reduce the dilutability of the black ink, so that the drying efficiency of the black ink is improved.

The invention also provides a preparation method of the UV offset printing black ink with the printing bar code grade of more than 3.0, which comprises the following steps:

After the UV offset black ink is prepared, performance tests are carried out on black inks with different proportions, and the test results are shown in table 2.

Wherein, the material components in each example are shown in Table 1.

TABLE 1 weight parts table for different substances in the examples

Table 2 table of properties of UV offset black inks prepared in different examples

Performance/parameter	Example 1	Example 2	Example 3	Example 4	Example 5
						Abnormal odor	Is composed of	Is composed of	Is free of	Is composed of	Is free of
Non-volatile component	＞99.9％	＞99.9％	＞99.9％	＞99.9％	＞99.9％
						Viscosity (25 ℃) mPa.s	135000	152000	139000	144000	157000
Ink mist	Light fly	Light fly	Light fly	Light fly	Light fly
						The emulsification rate%	33.8	45.3	36.5	39.7	42.5
Fineness of fineness	≤5μm	≤5μm	≤5μm	≤5μm	≤5μm
						Curing energy mj/cm ²	60	75	70	70	75
Glossiness (45 degree)	58.3	43.0	48.4	46.1	32.1
						Ink transfer Rate%	59	44	52	51	47
Surface tension mN/m	24.252	24.536	24.376	24.732	24.501
						Printed bar code decipherable degree grade	＞3.0	＞3.0	＞3.0	＞3.0	＞3.0

As can be seen from Table 2, the UV offset black ink prepared by the process of the present invention has the best overall performance in the formulation disclosed in example 1.

In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the present invention.

Claims

1. The UV offset printing black ink with the printing bar code grade of more than 3.0 is characterized by comprising the following components in parts by weight:

2. the UV offset black ink of claim 1, having a printed barcode rating of greater than 3.0, wherein: the plant carbon black is c.i. pigment black 7.

3. The UV offset black ink of claim 1, having a printed barcode rating of greater than 3.0, wherein: the basic blue pigment is c.i pigment blue 61.

4. The method for preparing the UV offset black ink with the printing bar code grade of more than 3.0 according to any one of claims 1 to 4, which is characterized by comprising the following steps:

and S3, grinding the black ink semi-finished product prepared in the step S2 by using a hydraulic three-roller machine until the fineness is less than or equal to 5 mu m to prepare an offset printing black ink finished product, and packaging after the product is qualified.