A white ink that resists stacking

Abstract

The present invention provides an anti-stacking white ink, comprising the following components, by weight: 35.0-80.0% solvent, 20.0-30.0% white color paste, 4.5-9.0% resin, 1.0-3.0% conductive agent, and 4.0-20.0% auxiliary color paste, with the total weight percentage of each component being 100%. The auxiliary color paste is prepared by mixing a eutectic of silicon dioxide and aluminum oxide with cyclohexanone and grinding it to a certain particle size with a dispersant. Compared to the prior art, the present invention adds a eutectic of silicon dioxide and aluminum oxide. Because the eutectic has the property of easily forming a spherical structure, it can well encapsulate the other components of the ink, making the surface of the white ink uniform and rounded, and effectively reducing the phenomenon of white ink stacking at the recycling port.

Description

Technical Field

[0001] The invention belongs to the technical field of ink, in particular to an anti-stacking white ink. Background Art

[0002] An inkjet printer is an output device that prints computer processing results, creating new images by spraying ink droplets onto paper, plastic, and other substrates. Based on their operating principles, inkjet printing is categorized as continuous inkjet (CIJ) and drop-on-demand (DOD). Continuous inkjet uses pressure to continuously eject ink from a single nozzle, where it breaks down into dots after crystal oscillation. These dots are then charged and deflected by high voltage, scanning the surface of a moving object to form characters. This method is widely used for numbering and labeling printed packaging for food, beverages, pharmaceuticals, and cosmetics.

[0003] The printhead assembly of an existing CIJ inkjet printer includes a mounting housing, within which are mounted two matching ink droplet deflector plates. These plates are secured to the bottom of the housing via mounting units. A fixing plate is provided on the side of the housing to secure the housing. The printhead assembly also includes a recovery port on the housing for recovering ink droplets not deflected by the deflector plates.

[0004] When a CIJ inkjet printer uses white ink, ink droplets that are not deflected by the ink drop deflector will accumulate at the recovery port, requiring the printer to be stopped for cleaning, affecting printing efficiency. Summary of the Invention

[0005] Based on this, an object of the present invention is to provide an anti-stacking white ink.

[0006] The anti-stacking white ink of the present invention is composed of the following components by weight percentage:

[0007]

[0008] The total weight percentage of each component is 100%. The auxiliary color paste is prepared by mixing a eutectic of silicon dioxide and aluminum oxide with cyclohexanone and grinding the mixture with a dispersant to a certain particle size.

[0009] Compared with the existing technology, the present invention adds a eutectic of silicon dioxide and aluminum oxide. Since the eutectic has the characteristic of being easy to form a spherical structure, it can well wrap the other components of the ink, making the surface of the white ink uniform and round, and effectively reducing the stacking of white ink at the recovery port.

[0010] In one embodiment, the eutectic of silicon dioxide and aluminum oxide is synthesized at high temperature with a weight percentage of 50.0-64.0% aluminum oxide, 36.0-50.0% silicon dioxide, and 1-5% fluorite.

[0011] In one embodiment, the dispersant is a polyester dispersant and an amide dispersant.

[0012] In one embodiment, in the additive paste, the particle size of the eutectic of silicon dioxide and aluminum oxide after grinding is D50: 0.113-1.108 μm.

[0013] In one embodiment, the resin includes cellulose acetate butyrate, pentaerythritol rosin ester, aldehyde ketone resin and acrylic resin.

[0014] In one embodiment, the weight percentage of the cellulose acetate butyrate resin is 3.5-5.0%, the weight percentage of the pentaerythritol rosin ester is 0.5-2.0%, the weight percentage of the aldehyde ketone resin is 0.5-1.5%, and the weight percentage of the acrylic resin is 0-0.5%.

[0015] In one embodiment, the solvent consists of 30.0-50.0% by weight of butanone and 5.0-30.0% by weight of acetone.

[0016] In one embodiment, the conductive agent is a conductive salt.

[0017] In one embodiment, the white color paste is titanium dioxide.

[0018] In one embodiment, the components of the white ink and the mass percentages of the components are as follows:

[0019] DETAILED DESCRIPTION

[0020] In order to further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the claims of the present invention.

[0021] In order to prevent the white ink from stacking at the recovery port, the present invention adds a eutectic of silicon dioxide and aluminum oxide. Since the eutectic has the characteristic of being easy to form a spherical structure, it can well wrap the other components of the ink, making the surface of the white ink uniform and round, effectively reducing the stacking phenomenon of white ink at the recovery port.

[0022] Specifically, the present invention discloses an anti-stacking white ink, which is composed of the following components by weight percentage:

[0023]

[0024] The total content of each component is 100%.

[0025] The solvent is composed of one or more organic solvents selected from alcohols, ketones, or esters, capable of dissolving other components in the ink. Preferably, the solvent comprises 30.0-50.0% by weight of butanone and 5.0-30.0% by weight of acetone. A white colorant is used as the colorant, and the present invention employs titanium dioxide as the white colorant.

[0026] In order to ensure the adhesion of ink to the substrate, the resin of the present invention includes cellulose acetate butyrate, pentaerythritol rosin ester, aldehyde ketone resin and acrylic resin, the weight percentage of cellulose acetate butyrate is 3.5-5.0%, the weight percentage of pentaerythritol rosin wax is 0.5-2.0%, the weight percentage of aldehyde ketone resin is 0.5-1.5%, and the weight percentage of acrylic resin is 0-0.5%.

[0027] In the present invention, the conductive agent is a conductive salt. The conductive salt can be selected from: alkali metal salts, such as lithium salts, sodium salts, potassium salts; alkaline earth metal salts, such as magnesium salts and calcium salts; and primary ammonium salts or quaternary ammonium salts; these salts are in the form of halides (chlorides, bromides, iodides, fluorides), perchlorates, nitrates, thiocyanates, formates, acetates, sulfates, propionates, trifluoroacetates, trifluoromethanesulfonates (trifluoromethanesulfonates), hexafluorophosphates, hexafluoroantimonates, tetrafluoroborates, picrates, carboxylates, or sulfonates.

[0028] In order to improve the anti-stacking performance of the ink, the present invention adds an auxiliary color paste. Specifically, the auxiliary color paste is made by mixing a eutectic of silicon dioxide and aluminum oxide in cyclohexanone and grinding it with a dispersant to a certain particle size. The eutectic of silicon dioxide and aluminum oxide is synthesized at high temperature by weight of 50.0-64.0% aluminum oxide, 36.0-50.0% silicon dioxide, and 1-5% fluorite, and the dispersant is preferably a polyester dispersant and an amide dispersant. Specifically, the polyester dispersant is synthesized by esterification or transesterification of polyacids and polyols, has a polymer chain structure, has good solubility and dispersibility, can effectively disperse solid particles in liquids, and prevent particle agglomeration and sedimentation. Amide dispersants refer to dispersant compounds in which the hydroxyl group in the carboxylic acid is replaced by an amino group or an amine group, including but not limited to hexenyl bisstearamide and polyacrylamide. In the auxiliary color paste, the particle size of the eutectic of silicon dioxide and aluminum oxide after grinding is 0.113-1.108 μm.

[0029] The white ink of the present invention is added with a eutectic of silicon dioxide and aluminum oxide. Since the eutectic has the characteristic of being easy to form a spherical structure, it can well wrap the other components of the ink, making the surface of the white ink uniform and round, and effectively reducing the stacking phenomenon of the white ink at the recovery port.

[0030] In order to further understand the present invention, the anti-stacking white ink of the present invention is described in detail below with reference to the embodiments. The protection scope of the present invention is not limited by the following embodiments.

[0031] Example 1

[0032] In this embodiment, the components of the anti-stacking white ink and the mass percentages of the components are as follows:

[0033]

[0034] The preparation process of the additive color paste is as follows: (1) 60.0 parts by weight of aluminum oxide, 37.0 parts by weight of silicon dioxide, and 3.0 parts by weight of fluorite are ground, sieved, dried, and dehydrated, and then a eutectic of silicon dioxide and aluminum oxide is synthesized in a high-temperature electric furnace at 1350°C. (2) 500 parts by weight of the eutectic, 373 parts by weight of cyclohexanone, 54 parts by weight of a polyester dispersant, and 71 parts by weight of an amide dispersant are ground at a speed of 2500 rad / min to a particle size range of D50: 0.113-1.108 μm.

[0035] The preparation process of the anti-stacking white ink is as follows: using a high-speed disperser to fully stir the corresponding components, then using a three-stage filtration system to filter, and finally canning the filtered ink.

[0036] Example 2

[0037] In this embodiment, the components of the anti-stacking white ink and the mass percentages of the components are as follows:

[0038]

[0039] Among them, the components and preparation method of the auxiliary agent paste and the preparation method of the anti-stacking white ink are the same as those in Example 1.

[0040] Example 3

[0041] In this embodiment, the components of the anti-stacking white ink and the mass percentages of the components are as follows:

[0042]

[0043] Among them, the components and preparation method of the auxiliary agent paste and the preparation method of the anti-stacking white ink are the same as those in Example 1.

[0044] Comparative Example 1

[0045] In this comparative example, the mass percentages of the anti-stacking white ink are as follows:

[0046]

[0047] The preparation method of the anti-stacking white ink is the same as that in Example 1.

[0048] Comparative Example 2

[0049] In this comparative example, the components of the anti-stacking white ink and the mass percentages of the components are as follows:

[0050]

[0051]

[0052] Among them, the components and preparation method of the auxiliary agent paste and the preparation method of the anti-stacking white ink are the same as those in Example 1.

[0053] Comparative Example 3

[0054] In this comparative example, the components of the anti-stacking white ink and the mass percentages of the components are as follows:

[0055]

[0056] Among them, the components and preparation method of the auxiliary agent paste and the preparation method of the anti-stacking white ink are the same as those in Example 1.

[0057] Comparative Example 4

[0058] This comparative example is basically the same as Example 3, with the only difference being that in the auxiliary color paste, the weight proportion of aluminum oxide is 40%, and the weight proportion of silicon dioxide is 60%.

[0059]

[0060] Comparative Example 5

[0061] This comparative example is basically the same as Example 3, except that in the auxiliary color paste, the particle size range of the eutectic of silicon dioxide and aluminum oxide after grinding is D50: 0.102-0.105 μm.

[0062]

[0063] Comparative Example 6

[0064] This comparative example is basically the same as Example 3, except that in the auxiliary color paste, the particle size range of the eutectic of silicon dioxide and aluminum oxide after grinding is D50: 0.205-0.208 μm.

[0065]

[0066] The anti-stacking white inks prepared in Examples 1-3 and Comparative Examples 1-6 were tested for performance, and the results are shown in Table 1. The anti-stacking performance of the inks was measured by the time it took to observe ink accumulation at the recycle port. The specific method was to power on the CIJ inkjet printer, adjust the ink dot separation to normal, apply voltage, and print. The timing was then started, and the ink recycle port was observed for any accumulation. When ink accumulation was observed, the printing time was recorded.

[0067] Table 1 Anti-stacking white ink performance data table

[0068]

[0069]

[0070] As can be seen from Table 1, the white inks of Examples 1-3 of the present invention were observed to have ink piling at the recycling port after more than 7 hours, indicating that the anti-ink piling performance of the white ink of the present invention has been greatly improved. Specifically, compared with Example 2, in which the ink piling phenomenon at the recycling port was observed at 10 hours, the white ink of Comparative Example 1, which did not add an auxiliary color paste, was observed to have ink piling at the recycling port at 0.5 hours, indicating that the auxiliary color paste of the present invention can effectively prevent the ink piling phenomenon. This is mainly because the auxiliary color paste of the present invention includes a eutectic of silicon dioxide and aluminum oxide, which has the characteristic of being easy to form a spherical structure, and can well wrap the other components of the ink, making the surface of the white ink uniform and rounded, thereby effectively reducing the stacking phenomenon of the white ink at the recycling port.

[0071] Compared to the 15.0% weight percentage of the additive colorant in Example 2, the weight percentages of the additive colorant in Comparative Example 2 and Comparative Example 3 were 2.0% and 25.0%, respectively, both falling outside the 4.0-20.0% range specified by the present invention. Ink accumulation at the recycle port was observed in Example 2 after 10 hours, while in Comparative Example 2 and Comparative Example 3 after 2.8 hours and 4.0 hours, respectively. Clearly, the anti-stacking performance of Comparative Examples 2 and 3 is significantly lower than that of Example 2. Therefore, the weight percentage of the additive colorant in the present invention can also affect the anti-stacking performance of the ink.

[0072] Compared with Example 3, in the auxiliary color paste of Comparative Example 4, the weight percentages of aluminum oxide and silicon dioxide are not within the range defined by the present invention; in the auxiliary color paste of Comparative Example 5, the particle size of the eutectic of silicon dioxide and aluminum oxide after grinding is smaller than the range defined by the present invention; in the auxiliary color paste of Comparative Example 6, the particle size of the eutectic of silicon dioxide and aluminum oxide after grinding is larger than the range defined by the present invention. In Example 3 of the present invention, ink stacking at the recovery port was observed after 7.6 hours, while in Comparative Examples 4, 5, and 6, it was 3.9 hours, 4.1 hours, and 4.0 hours, respectively. Obviously, the anti-stacking performance of Comparative Examples 4, 5, and 6 is significantly lower than that of Example 3. Therefore, the auxiliary color paste of the present invention, the weight percentages of aluminum oxide and silicon dioxide, and the particle size range of the eutectic of silicon dioxide and aluminum oxide after grinding can all affect the anti-stacking performance of the ink.

[0073] The above-described embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

Claims

1. A white ink that prevents stacking, characterized by: By weight percentage, it is composed of the following components: Solvent 35.0-80.0% White color paste 20.0-30.0% Resin 4.5-9.0% Conductive agent 1.0-3.0% Auxiliary color paste 4.0-20.0% The total weight percentage of each component is 100%; the resin includes cellulose acetate butyrate, pentaerythritol rosin ester, aldehyde-ketone resin, and acrylic resin; the auxiliary agent paste is prepared by mixing a eutectic of silicon dioxide and aluminum oxide in cyclohexanone and grinding with a dispersant to a particle size D50 of 0.113-1.108 μm; the eutectic of silicon dioxide and aluminum oxide is synthesized at high temperature by weight of 50.0-64.0% aluminum oxide, 36.0-50.0% silicon dioxide, and 1-5% fluorite.

2. The anti-stacking white ink according to claim 1, wherein: The dispersants are polyester dispersants and amide dispersants.

3. The anti-stacking white ink according to any one of claims 1-2, characterized in that: The weight percentage of the cellulose acetate butyrate ester is 3.5-5.0%, the weight percentage of the pentaerythritol rosin ester is 0.5-2.0%, the weight percentage of the aldehyde ketone resin is 0.5-1.5%, and the weight percentage of the acrylic resin is 0-0.5%.

4. The anti-stacking white ink according to any one of claims 1-2, characterized in that: The solvent consists of 30.0-50.0% by weight of butanone and 5.0-30.0% by weight of acetone.

5. The anti-stacking white ink according to any one of claims 1-2, characterized in that: The conductive agent is a conductive salt.

6. The anti-stacking white ink according to any one of claims 1-2, characterized in that: The white color paste is titanium dioxide.

7. The anti-stacking white ink according to claim 1, wherein: The components of the white ink and the mass percentages of the components are as follows: Acetone 10.0% Butanone 40.0% White color paste 26.0% Cellulose acetate butyrate 4.5% Pentaerythritol rosin ester 1.5% Aldehyde ketone resin 1.0% Acrylic resin 0.5% Tetrabutylammonium hexafluorophosphate 1.5% Auxiliary color paste 15.0%.

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