RU2718756C2 - Adhesive for jet printing and method for production thereof - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to adhesives for digital jet printing. Adhesive contains 1–27 wt. % organosilane of formula (1), where f is acrylic, methacryl or epoxy group; 3 < n < 8; Z is an alkoxy group; 70–90 wt. % hydrophilic organic solvent, 0.1–0.3 wt. % monobasic organic acid and 2.9–8.7 wt. % water. Described also is a method of making said adhesive, involving obtaining a hydrolysed condensate at 20–25 °C and mixing it with said solvent.

(1).

EFFECT: invention simplifies adhesive technology while reducing process duration and power consumption, as well as high mechanical stability and moisture resistance of printed images.

4 cl, 1 tbl, 4 ex

Description

The present invention relates to compositions for applying to glass and ceramic surfaces, increasing the adhesion of the ink used in digital inkjet printing and cured by ultraviolet radiation. Using the proposed adhesive, the mechanical resistance is increased, as well as the resistance to moisture of full-color images obtained on the basis of ink cured by ultraviolet radiation.

A similar composition of the inkjet adhesive is known, which is described in patent CN 107523207 "Functional primer used for ultraviolet printing, as well as a method of preparation and method of its use", containing 30-40 parts of urethane acrylate resin, 5-10 parts of polyester acrylate resins, 10-15 parts of oil-free alkyd resin, UV photoinitiator 5-10 parts, 1-2 parts of a silane coupling agent, 2-5 parts of a dispersant, 1-1.5 parts of a leveling agent, 1-2 parts of a defoamer and 2-5 parts of inorganic nanoparticles. Triethylhexylphosphoric acid or sodium polycarboxylate can act as a dispersant, phosphate-modified acrylic acid can act as a leveling agent, organosiloxane antifoam or epoxy resins can act as antifoam, and rutile and calcium carbonate nanoparticles mixed in the ratio 2 can act as inorganic nanoparticles: 1.

The disadvantage of this inkjet adhesive formulation is the presence of rutile and calcium carbonate in the nanoparticles, which leads to image deterioration when printing on a transparent or mirror surface, as well as the use of organic solvents with a pungent odor, such as butyl acetate, in addition, the use of alkyd resin and UV - photo-initiator gives a yellow tint to the adhesive, as well as a large number of components that make up the adhesive can lead to instability of the system.

The closest analogue to the composition of the adhesive for inkjet printing, selected as a prototype, is the patent JP 2016056257 “Adhesive composition of glass primer” containing hydroditic condensate containing methyltrimethoxysilane and 3- (trimethoxysilyl) propyl methacrylate in an amount of 0.5-20 mass , parts, water, 100 parts, parts and hydrophilic organic solvent in an amount of 1-2000 parts, parts, which may be methanol, ethanol, 2-propanol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether olia, ethylene glycol monobutyl ether, propylene glycol monomethyl ether, propylene glycol n-propyl ether, glycol ethers such as dipropylene glycol monopropyl ether and the like, acetone, tetrahydrofuran, methyl ethyl ketone, etc., which can be mixed with water at any ratio .

The disadvantage of the prototype is the presence in the composition of the final product of water and methyltrimethoxysilane, which can be hydrolyzed, which leads to the formation of organosilicon sol, this can adversely affect the stability of the mixture. In particular, the viscosity of the composition may increase over time, which will complicate its uniform application to the glass and ceramic surfaces.

The analogue for the method of manufacturing an adhesive for inkjet printing is the patent CN 107523207 "Functional primer used for ultraviolet printing, as well as the preparation method and method of its use", in which:

1. At room temperature, the solvent (n-hexane, n-butanol and butyl acetate) is added to a reactor equipped with a high-speed stirrer, the stirrer rotational speed is set to 2500-3000 rpm, and then a urethane-acrylate resin is added in parts;

2. At room temperature, add polyester acrylate resin, oil-free alkyd resin, UV photoinitiator, silane coupling agent, dispersant, leveling agent, antifoam in the specified sequence;

3. After dispersion, inorganic nanoparticles are added;

Example

1. At room temperature, the solvent and urethane-acrylate resin are added in a 1: 2 ratio to a reactor equipped with a high-speed stirrer, and the stirrer is set at 3000 rpm, the urethane-acrylate resin is added in parts (5 portions);

2. At room temperature, add 5 parts of polyester acrylate resin, 10 parts of oil-free alkyd resin, 5 parts of UV photoinitiator, 1 part of a silane coupling agent, 2 parts of a dispersant, 1 part of a leveling agent, 1 part of a defoamer in the indicated sequence;

3. After complete dispersion, add 2 parts of inorganic nanoparticles.

The disadvantage of this method is the need for energy-intensive equipment, because high viscosity components are used.

The closest analogue to the method of manufacturing an adhesive for inkjet printing, selected as a prototype, is the patent JP 2016056257 "Adhesive composition of glass primer", in which:

1. In a reactor equipped with a stirrer, hydrolyzed condensate, water and a hydrophilic organic solvent are charged;

2. The mixture is stirred until a homogeneous composition.

Example 1

1. An example of obtaining hydrolysis condensate

- 49.673 masses. including 3- (trimethoxysilyl) propyl methacrylate was dissolved in 60 wt. including 2-propanol.

- To the resulting mixture was added 10.80 mass. including a 0.1 M hydrochloric acid solution and the mixture was stirred at 40 ° C for 1 hour and further stirred at 75 ° C for 1 hour.

2. To 100 mass. including hydrolysis condensate add 900 mass. including 2-propanol, add 10 mass. including water and 5 mass. including diacetate dibutyl tin.

Example 2

1. An example of obtaining hydrolysis condensate

- 24.84 mass. including 3- (trimethoxysilyl) propyl methacrylate and 13.62 mass. including methyltrimethoxysilane was dissolved in 60 wt. including 2-propanol.

- To the resulting mixture was added 10.80 mass. h. 0.1 M hydrochloric acid solution and the mixture was stirred at 40 ° C for 45 minutes and further stirred at 70 ° C. for 45 minutes.

2. To 100 mass. including hydrolysis condensate add 900 mass. including 2-propanol, add 10 mass. including water and 5 mass. including diacetate dibutyl tin.

The disadvantage of the method of manufacturing an inkjet adhesive selected as a prototype is the presence of heating and cooling of the reaction mass at the stage of manufacturing the hydrolysis condensate, which leads to an increase in the manufacturing time of the adhesive, as well as an increase in energy costs.

The task (technical result) to which the invention is directed is to eliminate the formation of an organosilicon sol in the final product and increase the stability of the mixture, as well as to develop a universal method for manufacturing such an adhesive, in which the manufacturing process is reduced and energy costs are reduced.

This object is achieved by the fact that in the known adhesive for inkjet printing containing 3- (trimethoxysilyl) propyl methacrylate, hydrophilic organic solvent and water, moreover, organic acid in an amount of 0.1-0.3 mass is added to the composition. %, and 3- (trimethoxysilyl) propyl methacrylate is taken in an amount of 1-27 wt. % hydrophilic organic solvent in an amount of 70-90 wt. %, water in an amount of 2.9-8.7 mass. % Moreover, the adhesive has a Brookfield viscosity of 2.1-2.4 cP at 25 ° C and a surface tension of 33-34 dyne / cm at 25 ° C.

Moreover, the monobasic carboxylic acid with a long carbon chain of 2-3 atoms can act as an organic acid.

An organosilane can be a substance having a formula of the form:

f is a functional group, which, depending on the material used, may be acrylic, methacrylic, phenyl, hydroxyl, urethane, epoxy; (CH ₂ ) _n - changes 3 <n <8; Z - hydrolyzing functional group may be carboxyl, alkoxyl.

As a hydrophilic organic solvent, ethanol, propanol-1, butanol-1, propanol-2 and butanol-2 can be used.

In addition, the task is achieved by the fact that in the known method in which the hydrolysis condensate is prepared, the obtained hydrolysis condensate, hydrophilic organic solvent and water are mixed, while the hydrolysis is carried out at a temperature in the range of 20-25 ° C.

A method of manufacturing an adhesive for inkjet printing is performed in the following order:

1. In a dissolver, at a temperature in the range of 20-25 ° C, equipped with an overhead stirrer, add 3- (trimethoxysilyl) propyl methacrylate and add organic acid and water with stirring at a laboratory mill of 700-800 rpm;

2. After 5-15 minutes, the solution becomes clear and a hydrophilic organic solvent is added;

3. The resulting reaction mixture was stirred on a laboratory mill in a dissolver at 280 rpm for 60 minutes.

The proof of the solution of the tasks is shown in the example of execution. During the experiments, the following equipment was used:

1. Explosion-proof dissolver of Shenzhen Sanxing Feirong Machine Co., Ltd.

2. Overhead stirrer IKA RW20.

Example.

Adhesive for inkjet printing on glass and ceramic surfaces.

The order of preparation of the adhesive for inkjet printing:

1. In dissolver, under standard conditions, equipped with an overhead stirrer, add Gamma-methacryloxypropyltrimethoxysilane in an amount of 1.0 mass. % and with stirring on a laboratory mill 700-800 rpm add acetic acid in an amount of 0.2 mass. % and deionized water in an amount of 5.0 wt. %;

2. After 5-15 minutes, the solution becomes transparent and add propanol-2 in an amount of 93.8 wt. %;

3. The resulting reaction mixture was stirred on a laboratory mill in a dissolver at 280 rpm for 60 minutes.

The viscosity of the inkjet adhesive obtained is measured on a glass and ceramic surface on a Brookfield DV2T viscometer at a temperature of 25 ° C and a surface tension on a Kruss BP 50 tensiometer is measured. Brookfield viscosity at 25 ° C is 2.1-2.4 cP. Surface tension: 33-34 dyne / cm at 25 ° C.

To reduce the duration of the adhesive manufacturing process and, therefore, to reduce energy consumption was made possible by carrying out the process at lower temperatures.

The above example proves that, in comparison with the prototype, the proposed solution eliminates the formation of organosilicon sol, as evidenced by a constant value of dynamic viscosity at 25 ° C, having a value of 2.1-2.4 cP, which leads to the stability of the mixture as a whole.

In addition, the proposed method allows to obtain an adhesive for inkjet printing with an adhesion value whose classification value is 0, according to GOST 31149-2014 (ISO 2409: 2013) "Paint and varnish materials. Determination of adhesion by the grid cut method", even after the printed image is in water. Based on the proposed method, a universal technology for producing adhesive for inkjet printing has been developed and has been tested. The results obtained confirmed that adhesive for inkjet printing can be obtained on existing equipment using known starting components.

The application of technology based on the proposed method allows to produce adhesive in both large and small volumes, while reducing the duration of the process as a whole due to the equipment used and, consequently, reduces energy consumption.

Claims (7)

           1. The inkjet adhesive containing organosilane having the formula

, where f is a functional group, which, depending on the material used, can be acrylic, methacrylic, epoxy; 3 <n <8; Z is an alkoxy group, hydrophilic organic solvent and water, characterized in that the composition further contains monobasic organic acid in an amount of 0.1-0.3 wt.%, organosilane taken in an amount of 1-27 wt.%, hydrophilic organic solvent in an amount of 70-90 wt. %, water - in the amount of 2.9-8.7 wt.%, moreover, the adhesive has a Brookfield viscosity of 2.1-2.4 cP at 25 ° C and a surface tension of 33-34 dyne / cm at 25 ° C. 2. The adhesive according to claim 1, characterized in that the organic acid contains a monobasic carboxylic acid with a carbon chain length of 2-3 atoms. 3. The adhesive according to any one of claims 1, 2, characterized in that as a hydrophilic organic solvent contains ethanol, propanol-1, butanol-1, propanol-2 and butanol-2. 4. A method of manufacturing an inkjet adhesive according to claim 1, wherein the hydrolysis condensate is prepared by mixing organosilane, water and an organic acid, the obtained hydrolysis condensate and a hydrophilic organic solvent are mixed, and the hydrolysis is carried out at a temperature in the range of 20-25 ° C.