Anti-stacking white ink

Abstract

The invention provides anti-stacking white ink which is prepared from the following components in percentage by weight: 35.0 to 80.0 percent of solvent, 20.0 to 30.0 percent of white color paste, 4.5 to 9.0 percent of resin, 1.0 to 3.0 percent of conductive agent and 4.0 to 20.0 percent of auxiliary color paste, and the sum of the weight percent of all the components is 100 percent. The auxiliary color paste is prepared by mixing eutectic of silicon dioxide and aluminum oxide with cyclohexanone and grinding the mixture into a certain particle size by using a dispersing agent. Compared with the prior art, the eutectic of the silicon dioxide and the aluminum oxide is added, and the eutectic has the characteristic of being easy to form a spherical structure, so that other components of the ink can be well wrapped, the surface of the white ink is uniform and round, and the stacking phenomenon of the white ink at a recovery opening is effectively reduced.

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 the results of computer processing. It can create new images by spraying ink droplets onto paper, plastic and other substrates. According to different working principles, inkjet printing is divided into continuous ink jet (CIJ) and drop on demand (DOD). Continuous ink jet is to spray ink continuously from a single nozzle under pressure, and after crystal oscillation, it breaks to form ink dots; the ink dots are charged and deflected by high voltage, and then scanned into words on the surface of moving objects. It is widely used in the numbering and marking of packaging and printing products of food, beverages, medicines and beauty.

[0003] The nozzle assembly of the existing CIJ inkjet printer includes a mounting shell, in which two matching ink drop deflection plates are mounted, the ink drop deflection plates are fixed to the bottom of the mounting shell through a mounting unit, and a fixing plate for fixing the mounting shell is provided on the side of the mounting shell. The nozzle assembly also includes a recovery port provided on the mounting shell, which is used to recover ink droplets that have not been deflected by the ink drop deflection plates.

[0004] When the CIJ inkjet printer uses white ink, the ink droplets that are not deflected by the ink drop deflector plate will accumulate at the recovery port, requiring the machine 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 agent color paste is prepared by mixing the eutectic of silicon dioxide and aluminum oxide in cyclohexanone and grinding it with a dispersant to a certain particle size.

[0009] Compared with the prior art, 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 the white ink at the recovery port.

[0010] In one of the embodiments, 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 of the embodiments, in the auxiliary color 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 percentage of each component 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 up 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, and effectively reducing the stacking of the 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, which are selected from alcohols, ketones or esters and can dissolve other components in the ink. Preferably, the solvent is composed of 30.0-50.0% by weight of butanone and 5.0-30.0% by weight of acetone. The white color paste is used as a colorant, and the present invention uses titanium dioxide as the white color paste.

[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, etc.

[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 prepared by mixing the eutectic of silicon dioxide and aluminum oxide in cyclohexanone and grinding it with a dispersant to a certain particle size. Among them, 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, 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 prevents agglomeration and sedimentation of particles. 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 bis stearic acid amide and polyacrylamide. In the auxiliary color paste, the particle size of the eutectic of silicon dioxide and aluminum oxide after grinding is 0.113-1.108μm.

[0029] The eutectic of silicon dioxide and aluminum oxide is added to the white ink of the present invention. Since the eutectic has the characteristic of being easy to form a spherical structure, it can well wrap 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 in conjunction with embodiments, and 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 auxiliary 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 taken, ground and 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 taken, ground at a speed of 2500 rad / min, and ground 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 color 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 color 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 percentage of the anti-stacking white ink is 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 color 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 color 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, except 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 performance test of the anti-stacking white ink prepared in Examples 1-3 and Comparative Examples 1-6 is performed, and the results are shown in Table 1. The anti-stacking performance of the ink is represented by the time when ink is observed to be stacked at the recycling port, and the specific method is: turn on the CIJ inkjet printer, adjust the ink dot separation to be normal, turn on the voltage for printing, start timing, and observe whether there is ink stacking at the recycling port. When ink is observed to be stacked at the recycling port, record the printing time.

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

[0068]

[0069]

[0070] As can be seen from Table 1, the white ink of Examples 1-3 of the present invention was observed to have ink piling phenomenon at the recovery port after more than 7 hours, indicating that the anti-ink piling performance of the white ink of the present invention is greatly improved. Specifically, compared with Example 2 where the ink piling phenomenon at the recovery port was observed at 10 hours, the white ink of Comparative Example 1 did not add an auxiliary color paste, and the ink piling phenomenon at the recovery port was observed 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 recovery port.

[0071] Compared with the weight percentage of the auxiliary color paste of Example 2 being 15.0%, the weight percentage of the auxiliary color paste of Comparative Example 2 is 2.0%, and that of Comparative Example 3 is 25.0%, both of which are not within the range of 4.0-20.0% defined by the present invention. In Example 2 of the present invention, the phenomenon of ink stacking at the recovery port was observed after 10 hours, while the phenomenon of ink stacking at the recovery port was observed after 2.8 hours in Comparative Example 2, and 4.0 hours in Comparative Example 3. Obviously, the anti-stacking performance of Comparative Examples 2 and 3 is significantly lower than that of Example 2. Therefore, the weight percentage of the auxiliary color paste 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, 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 of the present invention can all affect the anti-stacking performance of the ink.

[0073] The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. An anti-stacking white ink, characterized in that: By weight percentage, it is composed of the following components: The total weight percentage of each component is 100%; the auxiliary agent color paste is prepared by mixing the eutectic of silicon dioxide and aluminum oxide in cyclohexanone and grinding it with a dispersant to a certain particle size.

2. The anti-stacking white ink according to claim 1, characterized in that: 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.

3. The anti-stacking white ink according to claim 1, characterized in that: The dispersants are polyester dispersants and amide dispersants.

4. The anti-stacking white ink according to claim 1, characterized in that: In the auxiliary color paste, the particle size of the eutectic of silicon dioxide and aluminum oxide after grinding is D50: 0.113-1.108 μm.

5. The anti-stacking white ink according to any one of claims 1 to 4, characterized in that: The resins include cellulose acetate butyrate, pentaerythritol rosin ester, aldehyde ketone resin and acrylic resin.

6. The anti-stacking white ink according to claim 5, characterized in that: 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%.

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

8. The anti-stacking white ink according to any one of claims 1 to 4, characterized in that: The conductive agent is a conductive salt.

9. The anti-stacking white ink according to any one of claims 1 to 4, characterized in that: The white color paste is titanium dioxide.

10. The anti-stacking white ink according to claim 1, characterized in that: The components of the white ink and the mass percentage of each component are as follows:

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