Supporting ink as well as preparation method and application thereof

Abstract

The invention provides supporting ink as well as a preparation method and application thereof, and belongs to the technical field of ink-jet printing. The supporting ink provided by the invention is prepared from the following raw materials in percentage by mass: 30-40% of water-soluble ceramic particles, 60-70% of an organic solvent, 1-5% of a dispersing agent and 1-5% of a binder, the dispersing agent is prepared from one or more of BYK 190, BYK 23160, SP 712, SRE 4026X and BYK 168; the binder is prepared from one or more of styrene-acrylic resin, butyral and polyvinylpyrrolidone. The dispersing agent and the binder are added and the types of the dispersing agent and the binder are controlled, so that the dispersion stability of the supporting ink is enhanced, particles are prevented from agglomerating and growing and blocking an ink-jet printing nozzle due to long-term standing of the ink, the dissolving efficiency of the supporting ink is improved, and the supporting ink can be dissolved in water within a short time.

Description

Technical Field

[0001] The invention belongs to the technical field of inkjet printing, and in particular relates to a supporting ink and a preparation method and application thereof. Background Art

[0002] Ceramic inkjet printing technology is a new type of non-contact digital printing technology. Compared with traditional subtractive manufacturing, it has the advantages of high production efficiency, less raw material waste, high molding precision, and the ability to achieve personalized and diversified customization. It has great application potential in industries such as industry, construction, and medical care.

[0003] Ceramic ink is the raw material for inkjet printing, and its performance determines the quality of the model green body and the finished product after sintering. Ceramic ink for inkjet printing is divided into model ink and support ink. Support ink plays the role of supporting and protecting the model as a support in the printing process. It needs to have a certain strength so that it can support and protect the model, and it needs to be easy to separate and remove from the model after printing to avoid adverse effects on the performance of the sintered finished product. The support ink in the prior art is mainly prepared from materials that are easily soluble in water, so that it can be separated from the model by soaking in water at a later time. However, the support ink in the prior art has poor dispersion stability. After standing for a long time, the particles will grow, thereby clogging the nozzle, and its dissolution time in water is still relatively long, which limits its application.

[0004] Therefore, there is an urgent need for a supporting ink with good dispersion stability and short dissolution time in water. Summary of the invention

[0005] The purpose of the present invention is to provide a supporting ink and a preparation method and application thereof. The supporting ink provided by the present invention has good dispersion stability and a short dissolution time in water.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0007] The invention provides a supporting ink, which is prepared from raw materials including the following mass percentages: 30-40% of water-soluble ceramic particles, 60-70% of an organic solvent, 1-5% of a dispersant and 1-5% of a binder; the dispersant includes one or more of BYK 190, BYK23160, SP 712, SRE 4026X and BYK 168; the binder includes one or more of styrene acrylic resin, butyral and polyvinyl pyrrolidone.

[0008] Preferably, the water-soluble ceramic particles include NaCl, Na 2 CO 3 、NaHCO 3 , K 2 CO3 and KHCO 3 One or more of them.

[0009] Preferably, the organic solvent includes one or more of diethylene glycol ethyl ether, diethylene glycol butyl ether, 1,2-propylene glycol, ethylene glycol and tripropylene glycol monomethyl ether.

[0010] Preferably, the solid content of the supporting ink is 30-40%.

[0011] Preferably, the surface tension of the supporting ink is 25-30 mN / m.

[0012] The present invention also provides a method for preparing the supporting ink described in the above technical solution, comprising:

[0013] The water-soluble ceramic particles, an organic solvent, a dispersant and a binder are mixed to obtain a support ink.

[0014] Preferably, the mixing comprises stirring and grinding performed sequentially.

[0015] Preferably, the stirring rate is 800-1600 rpm, and the stirring time is 10-40 min.

[0016] Preferably, the grinding rate is 1500-3000 rpm, and the grinding time is 3-6 hours.

[0017] The present invention also provides the use of the supporting ink described in the above technical solution or the supporting ink prepared according to the preparation method described in the above technical solution in ceramic inkjet printing.

[0018] The present invention provides a supporting ink, which is prepared from raw materials including the following mass percentages: 30-40% water-soluble ceramic particles, 60-70% organic solvent, 1-5% dispersant and 1-5% binder; the dispersant includes one or more of BYK 190, BYK23160, SP 712, SRE 4026X and BYK 168; the binder includes one or more of styrene acrylic resin, butyral and polyvinyl pyrrolidone. The present invention adds a dispersant and a binder and controls the types of the two, thereby enhancing the dispersion stability of the supporting ink, avoiding the agglomeration and growth of particles caused by the long-term standing of the ink, and clogging the inkjet printing nozzle, and at the same time improving the dissolution efficiency of the supporting ink, which can be dissolved in water in a short time. The results of the embodiment show that the viscosity and D50 of the supporting ink provided by the present invention change little after standing at room temperature for 5 weeks, and it is basically completely dissolved after being put into water for 7 minutes. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a viscosity test chart of the support ink prepared in Example 1;

[0020] Figure 2 The particle size distribution diagram of the support ink prepared in Example 1;

[0021] Figure 3 This is a physical picture of the support ink prepared in Example 1 after being left at room temperature for 5 weeks;

[0022] Figure 4 The D50 graph of the support ink prepared in Example 1 after standing at room temperature for different time periods;

[0023] Figure 5 The viscosity of the support ink prepared in Example 1 after standing at room temperature for different periods of time;

[0024] Figure 6 A physical picture of a support obtained by inkjet printing with the support ink prepared in Example 1;

[0025] Figure 7 Actual pictures of the support obtained by inkjet printing with the support ink prepared in Example 1 after being placed in water for different time periods. DETAILED DESCRIPTION

[0026] The invention provides a supporting ink, which is prepared from raw materials including the following mass percentages: 30-40% of water-soluble ceramic particles, 60-70% of an organic solvent, 1-5% of a dispersant and 1-5% of a binder; the dispersant includes one or more of BYK 190, BYK23160, SP 712, SRE 4026X and BYK 168; the binder includes one or more of styrene acrylic resin, butyral and polyvinyl pyrrolidone.

[0027] The raw materials for preparing the supporting ink of the present invention include 30-40% of water-soluble ceramic particles by weight percentage. In an embodiment of the present invention, the amount of the water-soluble ceramic particles can be specifically 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39% or 40%.

[0028] In the present invention, the water-soluble ceramic particles preferably include NaCl, Na 2 CO 3 、NaHCO 3 , K 2 CO 3 and KHCO 3 The present invention controls the amount and type of water-soluble ceramic particles within the above range, which can further improve the dispersion stability and solubility of the supporting ink.

[0029] The raw materials for preparing the supporting ink of the present invention include 60-70% of organic solvent by mass percentage. In an embodiment of the present invention, the amount of the organic solvent can be specifically 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69% or 70%.

[0030] In the present invention, the organic solvent preferably includes one or more of diethylene glycol ethyl ether, diethylene glycol butyl ether, 1,2-propylene glycol, ethylene glycol and tripropylene glycol monomethyl ether. The present invention controls the amount and type of the organic solvent within the above range, which can further improve the dispersion stability and solubility of the support ink.

[0031] The raw materials for preparing the supporting ink of the present invention include 1-5% of dispersant in terms of mass percentage. In the embodiment of the present invention, the amount of the dispersant can be specifically 1%, 2%, 3%, 4% or 5%.

[0032] In the present invention, the dispersant includes one or more of BYK 190, BYK23160, SP 712, SRE 4026X and BYK 168. The present invention controls the type and amount of the dispersant within the above range, so that the support ink has better dispersion stability and solubility.

[0033] The raw materials for preparing the supporting ink of the present invention include 1-5% of a binder in terms of mass percentage. In the embodiment of the present invention, the amount of the binder can be specifically 1%, 2%, 3%, 4% or 5%.

[0034] In the present invention, the binder includes one or more of styrene acrylic resin, butyral and polyvinyl pyrrolidone. The present invention has no special limitation on the source of the binder, and commercially available products known to those skilled in the art can be used. In an embodiment of the present invention, the styrene acrylic resin is purchased from BASF Joncry804, butyral is purchased from Shanghai Yingjia Industrial Development Co., Ltd. ARPVB-40s, and polyvinyl pyrrolidone is purchased from Huasheng Chemical Reagent Co., Ltd. K30. The present invention controls the type and amount of the binder within the above range, so that the support ink has better dispersion stability and solubility.

[0035] In the present invention, the solid content of the supporting ink is preferably 30-40%; the surface tension of the supporting ink is preferably 25-30 mN / m; the viscosity of the supporting ink is preferably 10-15 mPa.s; the particle size of the supporting ink is preferably <1 μm; and the D50 of the supporting ink is preferably 0.3-0.5 μm. The parameters of the supporting ink provided by the present invention meet the requirements of the inkjet printer for ink performance.

[0036] The present invention adds dispersants and binders and controls the types of the two, thereby enhancing the dispersion stability of the supporting ink, preventing the ink from standing still for a long time and causing particles to agglomerate and grow, thereby clogging the inkjet printing nozzle, and at the same time improving the dissolution efficiency of the supporting ink, so that the ink can be dissolved in water in a short time.

[0037] The present invention also provides a method for preparing the supporting ink described in the above technical solution, comprising:

[0038] The water-soluble ceramic particles, an organic solvent, a dispersant and a binder are mixed to obtain a support ink.

[0039] In the present invention, the mixing preferably includes stirring and grinding performed sequentially.

[0040] In the present invention, the stirring rate is preferably 800 to 1600 rpm. In an embodiment of the present invention, the stirring rate may specifically be 800 rpm, 900 rpm, 1000 rpm, 1100 rpm, 1200 rpm, 1300 rpm, 1400 rpm, 1500 rpm or 1600 rpm.

[0041] In the present invention, the stirring time is preferably 10 to 40 minutes. In an embodiment of the present invention, the stirring time can be specifically 10 minutes, 20 minutes, 30 minutes or 40 minutes. The present invention has no particular limitation on the stirring equipment, and a stirring equipment well known to those skilled in the art can be used. In an embodiment of the present invention, the stirring is carried out in a disperser.

[0042] In the present invention, the grinding speed is preferably 1500-3000 rpm. In an embodiment of the present invention, the grinding speed may be specifically 1500 rpm, 1800 rpm, 2000 rpm, 2200 rpm, 2500 rpm, 2800 rpm or 3000 rpm.

[0043] In the present invention, the grinding time is preferably 3 to 6 hours. In an embodiment of the present invention, the grinding time can be specifically 3 hours, 4 hours, 5 hours or 6 hours. The present invention has no particular limitation on the grinding equipment, and a grinding equipment well known to those skilled in the art can be used. In an embodiment of the present invention, the grinding is carried out in a sand mill.

[0044] By adopting the mixing method of the present invention, various raw materials can be mixed more evenly.

[0045] The present invention also provides the use of the supporting ink described in the above technical solution or the supporting ink prepared according to the preparation method described in the above technical solution in ceramic inkjet printing.

[0046] The present invention has no special limitation on the operation of the application, and the technical solutions of the application well known to those skilled in the art may be adopted.

[0047] The technical solutions in the present invention will be described clearly and completely below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] Example 1

[0049] A method for preparing a support ink: 33% of sodium carbonate, 64% of diethylene glycol ethyl ether, 2% of a dispersant SRE 4026X, and 1% of a binder styrene acrylic resin (BASF Joncry804) are mixed according to their mass percentages, stirred at 1200 rpm for 30 minutes using a disperser, and then ground at 1600 rpm for 5 hours using a sander to obtain a support ink.

[0050] The supporting ink prepared in Example 1 has a solid content of 33 wt % and a surface tension of 28 mN / m.

[0051] The viscosity of the support ink prepared in Example 1 at different shear rates is as follows: Figure 1 As shown. Figure 1 It can be seen that the viscosity of the support ink prepared in Example 1 is 14.3 mPa.s, which meets the requirements of inkjet printing.

[0052] The particle size distribution of the support ink prepared in Example 1 is as follows Figure 2 As shown. Figure 2 It can be seen that the particle size of the support ink prepared in Example 1 is mainly concentrated in the range of 250 to 800 nm, and D50 is 0.42 μm, which meets the requirements of inkjet printing.

[0053] The support ink prepared in Example 1 was poured into a measuring cylinder and sealed with a plastic film. The macroscopic image after standing at room temperature for 5 weeks was as follows: Figure 3 As shown. Figure 3 It can be seen that no obvious delamination phenomenon was found in the support ink after standing for 5 weeks. The solid content of the support ink prepared in Example 1 after standing for 5 weeks at room temperature was tested, and the solid content was 33wt%, and the surface tension was 28mN / m.

[0054] The D50 of the support ink prepared in Example 1 was tested at room temperature for 1 week, 2 weeks, 3 weeks, 4 weeks and 5 weeks. The results are as follows: Figure 4 As shown. Figure 4It can be seen that after standing for 5 weeks, the D50 of the support ink is 0.45 μm. Compared with before standing, the D50 of the support ink has not changed much, and the particles in the support ink have not aggregated and grown.

[0055] The viscosity of the support ink prepared in Example 1 was tested at room temperature for 1 week, 2 weeks, 3 weeks, 4 weeks and 5 weeks. The results are as follows: Figure 5 As shown. Figure 5 It can be seen that the standing time has little effect on the viscosity of the support ink. After standing for 5 weeks, the viscosity of the support ink is 16.1mPa.s, which meets the requirements of inkjet printing. Figures 3 to 5 It can be seen that the support ink prepared by the present invention has excellent dispersion stability, and no obvious stratification and particle agglomeration and growth will occur even if it is left standing for a long time.

[0056] The supporting ink prepared in Example 1 passes 30 mL through a 3 μm nylon filter at one time, while the supporting ink for commercial inkjet printing passes only 5 mL.

[0057] Application Examples

[0058] The support ink prepared in Example 1 was poured into an inkjet printer for printing. The thickness of a single layer of the support printing was 10 μm, the nozzle voltage was 14-15 V, and the support was printed 100 layers separately. The printed physical picture is as shown in FIG. Figure 6 As shown, Figure 6 The left side is the model and the right side is the support. Figure 6 It can be seen that there are no obvious defects on the printed support surface, indicating that the support for printing with the support ink of the present invention has a good bonding effect.

[0059] Put the printed support in the application example into water, and the actual pictures at different immersion times are as follows Figure 7 As shown, Figure 7 From left to right, they are just put into water, put into water for 2 minutes, put into water for 5 minutes, and put into water for 7 minutes. Figure 7 It can be seen that the support printed with the support ink of the present invention is basically completely dissolved in water for 7 minutes, which proves that the support has high dissolution efficiency and is conducive to promoting the efficiency of inkjet printing. The dissolution time of the support printed with the commercially available inkjet printing support ink in water is 10 to 15 minutes.

[0060] In summary, the support ink provided by the present invention has excellent dispersion stability, and the support printed with the support ink has a shorter dissolution time.

[0061] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A support ink is prepared from raw materials including the following mass percentages: 30-40% water-soluble ceramic particles, 60-70% organic solvent, 1-5% dispersant and 1-5% binder; the dispersant includes one or more of BYK 190, BYK23160, SP 712, SRE 4026X and BYK 168; the binder includes one or more of styrene acrylic resin, butyral and polyvinyl pyrrolidone.

2. The supporting ink according to claim 1, characterized in that: The water-soluble ceramic particles include one or more of NaCl, Na2CO3, NaHCO3, K2CO3 and KHCO3.

3. The supporting ink according to claim 1, characterized in that: The organic solvent includes one or more of diethylene glycol ethyl ether, diethylene glycol butyl ether, 1,2-propylene glycol, ethylene glycol and tripropylene glycol monomethyl ether.

4. The supporting ink according to claim 1, characterized in that: The solid content of the supporting ink is 30-40%.

5. The supporting ink according to claim 1, characterized in that: The surface tension of the supporting ink is 25-30 mN / m.

6. The method for preparing the supporting ink according to any one of claims 1 to 5, comprising: The water-soluble ceramic particles, an organic solvent, a dispersant and a binder are mixed to obtain a support ink.

7. The preparation method according to claim 6, characterized in that: The mixing includes stirring and grinding performed sequentially.

8. The preparation method according to claim 7, characterized in that: The stirring rate is 800-1600 rpm, and the stirring time is 10-40 min.

9. The preparation method according to claim 7, characterized in that: The grinding speed is 1500-3000 rpm, and the grinding time is 3-6 hours.

10. Use of the supporting ink according to any one of claims 1 to 5 or the supporting ink prepared according to the preparation method according to any one of claims 6 to 9 in ceramic inkjet printing.

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