Offset printing ink capable of preventing blistering after film covering

Abstract

The offset printing ink comprises the following materials in parts by weight: 45-60 parts of vegetable oil, 35-50 parts of resin, 5-15 parts of mineral oil and 0.5-2 parts of gel, the vegetable oil is a compound of tung oil and soybean oil, the resin is rosin modified octylphenol resin and rosin modified tertiary phenol resin, the mineral oil is light industrial white oil, the gel is liquid aluminum, and the gel is water. By combining the selected raw materials, performance parameters of the selected raw materials, optimized process conditions and parameter ranges, the prepared offset printing ink binder can be ensured to be excellent in texture and stable in performance, and the used raw materials are non-toxic, do not generate odorous toxic gas substances, have biodegradability and do not destroy ecology to cause environmental pollution.

Description

Technical Field

[0001] The invention relates to the technical field of ink printing, in particular to an offset printing ink that prevents bubbling after lamination. Background Art

[0002] After printing, paper printed products are often coated with a thin and transparent plastic film, which makes the surface smoother and brighter, not only improving the gloss and fastness of printed products, but also extending the service life of printed products. Commonly used coated packaging products include cartons, paper boxes, handbags, fertilizer bags, seed bags, self-adhesive labels, etc. At present, during the slitting, creasing, storage, book wrapping, corrugated mounting, and book stacking of printed products after lamination, sand-like stripes, worms, and moire-like film protrusions and empty bubbles are prone to appear in the dark tone position of the multi-color printing plate overprinting and the thick ink layer. This brings great trouble to ink manufacturers and printing manufacturers.

[0003] There are many reasons for the bubbling of ink during printing. The following are the main reasons for the bubbling of ink printing: (1) External causes of bubbles: dust and oil stains attached to the surface of the substrate; bubbles or uneven viscosity of the ink itself during printing; too fast printing speed or uneven printing speed; (2) Internal factors of bubble generation: Due to the high viscosity of ink and the high surface tension of ink, it is difficult for solvents such as gasoline in the ink to escape from the ink film and remain in the ink layer. If the ink viscosity is low and the surface tension is small, the bubbles will disappear by themselves, so there will be no bubble phenomenon in the printed ink, but it will take a long time.

[0004] Generally speaking, external causes of foaming can be eliminated through general defoaming methods in the production process. For example, bubbles are easily generated due to stirring, which requires grinding and defoaming with a three-roller machine. However, in most cases, it is an internal cause of the offset ink itself. The use of hydrophobic solvents, adding appropriate amounts of defoaming agents, etc. can also prevent and control the generation of bubbles.

[0005] However, generally speaking, the added solvent will remain in the ink with an unpleasant odor, and the added defoamer will be difficult to degrade and pollute the environment. Therefore, an ink is proposed that uses the raw materials used in the offset ink itself to prevent the offset ink from foaming during the lamination production process of printed products, and is biodegradable and free of odorous and toxic solvents, which will not pollute the environment. Summary of the invention

[0006] In view of the shortcomings of the prior art, the purpose of the present invention is to provide an offset printing ink that can prevent bubbling after lamination of printed matter. The raw materials used are easy to obtain. When various raw materials are combined with each other, the offset printing ink prepared can effectively prevent bubbling after lamination of printed matter.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions: An offset printing ink for preventing bubbling after lamination comprises the following materials by weight: 45-60 parts of vegetable oil, 35-50 parts of resin, 5-15 parts of mineral oil and 0.5-2 parts of gelling agent.

[0008] The above technical solution further includes: Wherein, the vegetable oil is a compound of tung oil and soybean oil.

[0009] Wherein, the resin is rosin-modified octylphenol resin and rosin-modified tertiaryphenol resin.

[0010] Wherein, the mineral oil is light industrial white oil.

[0011] Wherein, the gelling agent is liquid aluminum.

[0012] The mass ratio of tung oil to soybean oil in the vegetable oil is 3:1-2; when the ratio of the two meets the above definition, the effect of preventing the printed matter from bubbling after lamination is further improved.

[0013] Further, the rosin tert-butylphenol resin is prepared by heating a mixture of rosin, glycerol and tert-butylphenol in a reactor to 220±10°C, stirring the mixture, and then heating the mixture to 270±10°C, then slowly heating the mixture to 290±10°C (esterification stage) within 2 hours, and finally heating the mixture to 305±10°C for sampling and testing. The testing standard is as follows: the performance test parameters are as follows: softening point (ring and ball method) is 165-175°C, n-heptane capacity (25°C ml / 2g) is 3-6mL / g, acid value is ≤20mgKOH / g, color (Ghana color number) is ≤13, and viscosity (mpa.s / 25°C) is 8000-12000. After the sampling test is qualified, the mixture is cooled and discharged to obtain a transparent solid substance.

[0014] Furthermore, the performance test parameters of the rosin-modified octyl phenolic resin are as follows: softening point (ring and ball method) is 172-182°C, n-heptane capacity (25°C ml / 2g) is 10-20mL / g, acid value is ≤20mgKOH / g, color (Ghana color number) is ≤13, and viscosity (mpa.s / 25°C) is 10000-15000.

[0015] Furthermore, the mineral oil is a colorless, non-fluorescent, transparent light industrial white oil with a kinematic viscosity (40°C) of 3-5 mm2 / s, a density (20°C) of 820 kg / m3, a pour point of -8°C, and a flash point (opening) of 130°C; it has hydrocarbons of varying chain lengths, and can dissolve the resin well, so that the resin is fully moistened, and the connecting material produced under the synergistic effect of vegetable oil and gelling agent plays a connecting role between the printing substrate and the plastic film.

[0016] Furthermore, the viscosity of the offset ink vehicle tested at a viscosity meter speed of 400 rpm / min is 12 to 14, which is tested according to GB / T18723-2002; the viscosity of the ink vehicle tested at 25°C is 100,000 to 200,000 mPa.s, which is tested according to GB / T-2013; the n-heptane capacity of the ink vehicle is 5 to 6 ml / g.

[0017] The present invention has the following beneficial effects: (1) The present invention provides a method for preparing an offset ink vehicle for preventing bubbling after lamination of printed matter. The method combines the selected raw materials and their performance parameters, the preferred process conditions and parameter ranges, and can ensure that the prepared offset ink vehicle has excellent texture and stable performance.

[0018] (2) The offset printing ink for preventing bubbling after laminating a printed matter provided by the present invention can prevent bubbling after laminating a printed matter by using the offset printing ink binder provided by the present invention; Furthermore, the raw materials used are non-toxic in themselves, will not produce unpleasant toxic gases, are biodegradable, and will not damage the ecology or cause environmental pollution. Implementation

[0019] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Example

[0020] A method for preparing an offset printing ink vehicle for preventing blistering of offset printing ink after lamination of printed matter comprises the following steps: S1, first stir the formulated amount of vegetable oil and heat it to 160-180°C, add the formulated amount of rosin-modified phenolic resin in batches and stir and mix evenly, then heat it to 210-230°C and keep it warm for 50-60 minutes to obtain a uniform mixture; S2. Add the formulated amount of mineral oil to the mixture obtained in step S1, mix well, then cool to 100-110° C., add the formulated gelling agent, stir well, then heat to 140-150° C., and keep warm for 30-60 minutes to obtain the ink vehicle, i.e., the offset ink vehicle for preventing bubbling of offset ink after lamination of printed matter according to the present invention.

[0021] In order to achieve the third purpose of the present invention, the following technical solution is provided: An offset printing ink for preventing printed matter from bubbling after lamination comprises the following materials in parts by weight: 60-80 parts of an offset printing ink linker, 1-10 parts of mineral oil, 15-30 parts of a pigment and 0.5-5 parts of an auxiliary agent.

[0022] The offset printing ink connecting material is an offset printing ink connecting material provided by the present invention for preventing bubbling of the offset printing ink after lamination of printed matter.

[0023] Further, the mineral oil is a light industrial white oil; Furthermore, the pigment is one or a combination of two or more of benzidine yellow, ruby ​​​​red, phthalocyanine blue and carbon black.

[0024] Furthermore, one or a combination of two or more of the following: an auxiliary agent, a cobalt isooctanoate desiccant, a polyamide polyurea high molecular weight oligomer water repellent, an oxime anti-skinning agent, and an anionic dispersant.

[0025] In order to achieve the fourth objective of the present invention, the following technical solutions are provided: A method for preparing an offset printing ink for preventing bubbling after lamination of printed matter comprises the following steps: P1. After the offset ink vehicle and mineral oil in the formula amount are uniformly stirred at a speed of 200 to 400 rpm, the pigment in the formula amount is added, and then the mixture is stirred at a speed of 400 to 600 rpm for 5 to 10 minutes, and then the speed is changed to 1000 to 1200 rpm and stirred for 30 to 60 minutes to obtain a mixture; P2. Grind the mixture obtained in step P1 to a fineness of less than 15 μm using a grinding device, add a formulated amount of additives, and stir evenly at a speed of 300 to 500 rpm. The obtained product is an offset printing ink that prevents bubbling after lamination of printed materials.

[0026] Furthermore, in step P2, the grinding equipment is a pearl ink mill and a three-roll mill.

[0027] The invention provides an offset printing ink vehicle for preventing blistering of offset printing ink after lamination of printed matter, comprising the following materials by weight: 45-60 parts of vegetable oil, 35-50 parts of resin, 5-15 parts of mineral oil and 0.5-2 parts of gelling agent.

[0028] The present invention provides a method for preparing an offset printing ink vehicle for preventing blistering of offset printing ink after lamination of printed matter, comprising the following steps: S1, first stir the formulated amount of vegetable oil and heat it to 160-180°C, add the formulated amount of rosin-modified phenolic resin in batches and stir and mix evenly, then heat it to 200-210°C and keep it warm for 50-80 minutes to obtain a uniform mixture; S2. Add a formulated amount of mineral oil to the mixture obtained in the previous step S1, mix well, then cool to 100-110°C, add a formulated amount of rosin glycerol ester and gelling agent, stir well, then heat to 140-150°C, and keep warm for 30-60 minutes to obtain an offset ink vehicle, i.e., an offset ink vehicle for preventing bubbling of offset ink after lamination of printed matter according to the present invention.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An offset printing ink for preventing bubbling after lamination, characterized in that: The material comprises the following components by weight: 45-60 parts of vegetable oil, 35-50 parts of resin, 5-15 parts of mineral oil and 0.5-2 parts of gelling agent.

2. The offset printing ink for preventing foaming after lamination according to claim 1, characterized in that: The vegetable oil is a compound of tung oil and soybean oil.

3. The offset printing ink for preventing foaming after lamination according to claim 1, characterized in that: The resin is rosin-modified octylphenol resin and rosin-modified tertiaryphenol resin.

4. The offset printing ink for preventing foaming after lamination according to claim 1, characterized in that: The mineral oil is light industrial white oil.

5. The offset printing ink for preventing bubbling after lamination according to claim 1, characterized in that: The gelling agent is liquid aluminum.

6. The offset printing ink for preventing foaming after lamination according to claim 2, characterized in that: The mass ratio of tung oil to soybean oil in the vegetable oil is 3:1-2.

7. The offset printing ink for preventing foaming after lamination according to claim 3, characterized in that: The mass ratio of rosin octylphenol to rosin-modified tert-butylphenol-formaldehyde resin in the resin is 1:1.

5.

8. The offset printing ink for preventing bubbling after lamination according to claim 3, characterized in that: Rosin tert-butylphenol resin is prepared by heating and mixing a mixture of rosin, glycerin and tert-butylphenol in a reaction kettle.