Arachidic acid specific self-assembly modification of silver ions in organic printing inks

Abstract

This invention discloses a method for the arachidic acid-specific self-assembly modification of silver ions in printing inks, relating to the field of printing and manufacturing flexible electronic components. Its main purpose is to effectively improve ink stability, wherein the organic printing ink contains arachidic acid (C... 20 H 40 The added O2 (O2) percentage is 0.3%–3% by mass, with a mass ratio to silver ions in the ink of 1:1.3–1:3. This invention employs a method of pre-adding trace amounts of arachidic acid, which specifically protects some unstable silver ions in the organic printing ink during subsequent manufacturing, without negatively impacting the original ink system. Through surface self-assembly modification, it effectively reduces the flocculation of the ink. This avoids uncontrollable performance differences in printed electronic devices due to batch manufacturing variations, significantly reducing production costs and operational complexity, and facilitating the industrialization of printed flexible electronic devices.

Description

Technical Field

[0001] This invention relates to the field of printing and manufacturing flexible electronic components, and particularly to a method for the arachidic acid-specific self-assembly modification of silver ions in organic printing inks. Background Technology

[0002] In recent years, with the rapid development of flexible wearable electronic components, these products have greatly improved people's smart living standards due to their unique portability and ultra-high interconnectivity. Currently, the most mature process for manufacturing flexible electronic products is the FPCB process, which requires surface treatment operations such as micro-etching to form the required circuit patterns. This process has a significant negative impact on the electrical performance of electronic devices, especially high-frequency electronic devices with shorter wavelengths and shallower skin penetration. Therefore, printing inks based on printed manufacturing technology for flexible electronic components are gradually attracting attention.

[0003] Currently, the most mature metal conductive inks in the industry mainly form pre-circuit patterns through direct printing. However, there are still many problems in their application, including: the preparation process of metal nanoparticles is cumbersome and prone to oxidation, thus increasing production costs; to ensure printing quality, the pattern needs to be printed repeatedly, making the operation complex; these inks require high-temperature curing or sintering, resulting in high energy consumption. Therefore, more and more researchers have proposed a "two-step" preparation technology route, where the printing ink pre-spread on the substrate surface provides good active seed sites for subsequent metal growth. Organic printing inks have attracted widespread attention due to their unique high adhesion, good water resistance, and applicability to almost all types of paper and plastic substrates. However, the stability of currently used organic printing inks is still insufficient. Relatively poor ink stability can cause problems such as incomplete pre-circuit patterns and low line fineness. The main reason for this is that the silver ion active seeds in the organic printing ink system are relatively active and easily oxidized, thus accelerating the aggregation and sedimentation of this unstable metallic silver, thereby reducing the ink's stable printing ability, which is not conducive to promoting the industrial manufacturing process of flexible electronic devices.

[0004] For the reasons mentioned above, this invention provides a method for arachidic acid-specific self-assembly modification of silver ions in printing inks. The addition of arachidic acid does not have any negative impact on the stable silver ions in the ink. It only plays a specific protective role for these unstable silver ions through surface self-assembly modification, thereby reducing their flocculation and ensuring the printing quality of flexible electronic devices. Summary of the Invention

[0005] This invention provides a method for the arachidic acid-specific self-assembly modification of silver ions in printing inks. By specifically protecting the unstable active seeds of silver ions in organic printing inks, this method aims to solve the problems of poor stability, low printing quality, and unreliable electrical performance of organic printing inks used for printing flexible electronic components in a low-cost and easy-to-operate manner, without causing any negative impact on the original ink.

[0006] The technical solution provided by this invention is as follows:

[0007] The mass ratio of arachidic acid, which has a specific self-assembly modification function for unstable silver ions in organic printing inks, to silver ions in the ink is 1:1.3 to 1:3.

[0008] The present invention also discloses an organic printing ink, wherein the arachidic acid accounts for 0.3% to 3% by mass in the organic printing ink.

[0009] Furthermore, the organic printing ink further comprises the following components in weight percentage: soluble silver salt: 2%–5%; complexing agent: 5%–10%; resin: 30%–50%; diluent: 20%–50%.

[0010] Furthermore, in the organic printing ink, the soluble silver salt is at least one of silver nitrate, silver bromide, silver iodide, silver tellurite, silver selenate, and silver thiosulfate.

[0011] Further, the complexing agent is at least one selected from sec-butylamine, n-butylamine, ethylenediamine, propylenediamine, triethylenetetramine, and triethanolamine.

[0012] Furthermore, the resin is at least one selected from acrylic resin, polyurethane resin, and polyester resin.

[0013] Further, the diluent is at least one of tripropylene glycol diacrylate, isobornyl acrylate, 1,6-hexanediol diacrylate, and ethylene glycol acrylate.

[0014] This invention also provides a method for adding arachidic acid to organic printing inks, comprising the following steps:

[0015] (1) First, add the soluble silver salt to the complexing agent and stir magnetically at a speed of 100 r / min until the mixed solution is uniform, clear and free of undissolved particles.

[0016] (2) Further, under magnetic stirring (100 r / min), arachidic acid is slowly added to the mixed solution obtained in step (1) until it is completely dissolved and the solution does not show any stratification, thereby obtaining an active seed solution;

[0017] (3) Further, the active seed solution obtained in step (2) is mixed with resin and diluent for about 2h to 3h until the liquid is homogeneous and without layering, thereby obtaining organic printing ink.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] (1) This invention relates to the addition of arachidic acid with specific self-assembly modification function for unstable silver ions in organic printing inks. Only 0.3wt% to 3wt% of trace amounts of arachidic acid are needed to significantly improve the stability of printing inks and the printing quality of printed flexible electronic components.

[0020] (2) This invention employs a method of pre-adding trace amounts of arachidic acid, which specifically protects some unstable silver ions in organic printing inks during subsequent production or storage, without negatively impacting the original ink system. Through surface self-assembly modification, it effectively reduces the flocculation of the ink. Compared to commonly used methods in current production, this method eliminates the need for real-time control of ink quality and composition during production, thus avoiding uncontrollable performance differences in printed electronic devices due to batch manufacturing variations. This significantly reduces production costs and operational complexity, facilitating the industrialization of printed flexible electronic devices.

[0021] (3) The arachidic acid used in this invention also has the function of regulating the surface tension of printing ink, which further improves the printability of organic printing ink, enhances the compatibility of organic printing ink with various flexible substrates, and optimizes the printing quality and product performance of printed flexible electronic components.

[0022] (4) The organic printing inks involved in this invention do not produce volatile substances that are harmful to the environment during the production and preparation process, and there is no harmful gas emission, which is in line with the scope of green and environmentally friendly preparation. Attached Figure Description

[0023] Figure 1 This is a diagram illustrating the specific self-assembly modification mechanism of arachidic acid in the organic printing ink of this invention.

[0024] Figure 2 These are images showing the state of the organic printing inks prepared in the comparative example and Example 1 of this invention after being left for different times.

[0025] Figure 3 These are morphological images of the functional ink patterns prepared in the comparative example and Example 1 of this invention. Detailed Implementation

[0026] Example 1:

[0027] A method for arachidic acid-specific self-assembly modification of silver ions in organic printing inks includes the following steps:

[0028] (1) Prepare the active seed solution in the following order: Add 2g of soluble silver salt to 6g of complexing agent and stir magnetically at 100r / min until the mixed solution is uniform and clear and there are no undissolved particles. Then slowly add 0.7g of arachidic acid until it is completely dissolved and no solution separation occurs;

[0029] (2) Add the active seed solution obtained in step (1) to 30g of polyurethane resin and 25g of diluent, and mix and stir at 250r / min for 2h using an electric ink stirrer.

[0030] (3) Print circuit patterns using the organic printing ink prepared in step (2).

[0031] Examples 2-5:

[0032] The difference between Examples 2-5 and Example 1 is that the content of arachidic acid used in Examples 2-5 is different; the other steps are the same as in Example 1. The content of arachidic acid in Examples 2-5 is shown in Table 1.

[0033] Table 1. Amount of arachidic acid added to the organic printing inks in Examples 2-5

[0034] Add quality percentage 0.55％ 1.64％ 2.17％ 2.7％ Amount added (g) 0.35 1.05 1.4 1.75

[0035] Comparative example:

[0036] A method for arachidic acid-specific self-assembly modification of silver ions in organic printing inks includes the following steps:

[0037] (1) Prepare the active seed solution in the following order: add 2g of soluble silver salt to 6g of complexing agent and stir magnetically at 100r / min until the mixed solution is uniform and clear and there are no undissolved particles.

[0038] (2) Add the active seed solution obtained in step (1) to 30g of polyurethane resin and 25g of diluent, and mix and stir at 250r / min for 2h using an electric ink stirrer.

[0039] (3) Print circuit patterns using the organic printing ink prepared in step (2).

[0040] The stability days of the organic printing inks in the comparative examples and Examples 1-5 are shown in Table 2:

[0041] Table 2 Stability Test of Organic Printing Inks

[0042] Ink stability days 30 22 26 23 19 2

[0043] Figure 1 This is a diagram illustrating the mechanism of action of arachidic acid in organic printing inks.

[0044] Figure 2 The images show the state of the organic printing inks prepared in the comparative example and Example 1 after 2 days and 30 days, respectively. This demonstrates that the organic printing inks with added arachidic acid have a better stabilizing effect, and no ink flocculation or layering occurred after 30 days.

[0045] Figure 3 The figures show the edge accuracy results of the functional patterns printed with organic printing inks in the comparative example and Example 1, respectively. As shown in the figures, the functional ink patterns printed with the comparative example inks have lower edge accuracy, more severe ink overflow, uneven ink layer thickness, and ink breakage. In contrast, the ink patterns produced in Example 1 have uniform ink spread and good line accuracy.

[0046] The above examples are preferred embodiments of the present invention, but the implementation method of the present invention is not limited to the above embodiments. The organic printing ink is not limited to an ink with a specific composition. Within the scope of knowledge possessed by those skilled in the art, flexible changes can be made without departing from the spirit of the present invention.

Claims

1. A method for arachidic acid-specific self-assembly modification of silver ions in organic printing inks, characterized in that: Arachidonic acid C, which has specific self-assembly modification function, is added to organic printing inks containing silver ions. 20 H 40 O2; The mass ratio of arachidic acid to silver ions added to organic printing inks is 1:1.3 to 1:3, and arachidic acid accounts for 0.3% to 3% of the mass of organic printing inks. Organic printing inks also include the following components in the following weight percentages: soluble silver salt: 2%~5%, complexing agent: 5%~10%, resin: 30%~50%, diluent: 20%~50%; Method for adding arachidic acid: Step 1: Mix the soluble silver salt with the complexing agent and stir until the solution is clear, homogeneous, and free of undissolved particles; Step 2: While magnetically stirring the clear solution obtained in Step 1 at a speed of 100 r / min, slowly add arachidic acid until it is completely dissolved. The solution does not show any stratification or flocculation, thus obtaining the active silver ion seed solution. Step 3: Mix the active silver ion seed solution obtained in Step 2 with the resin and diluent for 2-3 hours until the organic printing ink is homogeneous and free of stratification.

2. The method for arachidic acid-specific self-assembly modification of silver ions in organic printing inks according to claim 1, characterized in that: The soluble silver salt is at least one of silver nitrate and silver thiosulfate.

3. The method for arachidic acid-specific self-assembly modification of silver ions in organic printing inks according to claim 1, characterized in that: The complexing agent is at least one of sec-butylamine, n-butylamine, ethylenediamine, propylenediamine, triethylenetetramine, and triethanolamine.

4. The method for arachidic acid-specific self-assembly modification of silver ions in organic printing inks according to claim 1, characterized in that: The resin is at least one of acrylic resin, polyurethane resin, and polyester resin.

5. The method for arachidic acid-specific self-assembly modification of silver ions in organic printing inks according to claim 1, characterized in that: The diluent is at least one of tripropylene glycol diacrylate, isobornyl acrylate, 1,6-hexanediol diacrylate, and ethylene glycol acrylate.

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