PCB ink with long storage period and preparation method thereof

Abstract

The invention provides PCB ink with a long storage period and a preparation method of the PCB ink, and belongs to the field of PCB ink. The main agent comprises 20-30 parts of main agent resin, 0.2-0.5 part of toner, 15-20 parts of main agent filling powder, 3-5 parts of an initiator, 0.3-0.8 part of a phenylimidazole hardening agent and 14-29 parts of a main agent organic solvent; the curing agent comprises 12-25 parts of curing agent resin, 3-8 parts of curing agent filling powder and 6-15 parts of a curing agent organic solvent; the hardening agent is phenylimidazole, so that the storage time after the main agent and the curing agent are mixed can be prolonged, the storage time of the ink can be effectively prolonged, and waste caused by the fact that the ink is not used for a specified time is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of PCB ink, and in particular to a PCB ink with a long shelf life and a preparation method thereof. Background Art

[0002] With the rapid development of electronic technology, the quality and performance of printed circuit boards (PCBs), as the core components of electronic devices, play a vital role in the overall performance of electronic devices. As the support of electronic components and the carrier of electrical connections, the manufacturing process of PCBs needs to be precise, efficient and reliable.

[0003] In the manufacturing process of PCB, the use of ink is an indispensable part. PCB ink is mainly composed of two components, the main agent and the curing agent. These two components are cured by chemical reaction after mixing, so as to form the required circuit pattern on the PCB board. However, there are some problems in the use of traditional PCB ink, especially the limited storage time after the two components are mixed. The storage time after the two components are mixed is 24 hours. During this period, the substances in the two components will slowly cross-link. When the cross-linking reaches a certain degree, the development will be unclean. It cannot be used after 24 hours. If the ink is not used up within 24 hours, it cannot be used, which will result in a waste of ink.

[0004] Invention application content

[0005] In view of this, the present invention provides a PCB ink with a long shelf life and a preparation method thereof. The present invention can extend the storage time of the main agent and the curing agent after mixing by setting the hardener to phenylimidazole, thereby effectively increasing the storage time of the ink and avoiding the waste caused by the ink not being used within the specified time.

[0006] In order to solve the above technical problems, the present invention provides a PCB ink with a long shelf life and a preparation method thereof, which is composed of a main agent and a curing agent, measured by weight;

[0007] The main agent includes 20-30 parts of main agent resin, 0.2-0.5 parts of color powder, 15-20 parts of main agent filling powder, 3-5 parts of initiator, 0.3-0.8 parts of phenylimidazole hardener, and 14-29 parts of main agent organic solvent;

[0008] The curing agent comprises 12 to 25 parts of curing agent resin, 3 to 8 parts of curing agent filling powder and 6 to 15 parts of curing agent organic solvent.

[0009] The main resin is epoxy acrylic resin.

[0010] The color powder is BASF Phthalocyanine Green K8730.

[0011] The main filling powder is silicon dioxide.

[0012] The initiator is an aromatic carbonyl compound.

[0013] The main organic solvent includes three types, namely dipropylene glycol monomethyl ether, 3-methoxy-3-methylbutyl ester, and diethylene glycol monobutyl ether.

[0014] There are two types of curing agent resins, namely acrylic monomer and epoxy resin E51.

[0015] The curing agent filling powder is barium sulfate.

[0016] The curing agent organic solvent includes two types, namely dipropylene glycol monomethyl and 3-methoxy-3-methylbutyl ester.

[0017] A method for preparing PCB ink with a long shelf life, comprising the following steps;

[0018] S1. Weigh the raw materials of the main agent and the curing agent according to the weight ratio for standby use;

[0019] S2. When preparing the main agent, first grind and evenly stir epoxy acrylic resin, BASF phthalocyanine green K8730, silicon dioxide, dipropylene glycol monomethyl ether, 3-methoxy-3-methyl acetate, and diethylene glycol monobutyl ether, then sequentially add aromatic carbonyl compounds and phenylimidazole hardeners and stir evenly at room temperature to obtain the main agent;

[0020] When preparing the curing agent, firstly grind the acrylic monomer, barium sulfate, dipropylene glycol monomethyl ether, and 3-methoxy-3-methyl acetate and stir them evenly, then add the epoxy resin E51 and stir them evenly at room temperature to obtain the curing agent;

[0021] S3. The main agent and the curing agent are mixed evenly in a weight ratio of 7:3 to obtain a finished ink product.

[0022] In summary, compared with the prior art, the present application includes at least one of the following beneficial technical effects:

[0023] 1. Extended shelf life: By using phenylimidazole hardeners, the present invention effectively extends the storage time of the main agent and the curing agent after mixing. Traditional PCB inks usually have a shelf life of only 24 hours after mixing, while the inks of the present invention can maintain good performance for a longer period of time, thereby avoiding waste caused by the ink not being used up within the specified time.

[0024] 2. Improve ink utilization: Due to the extended storage time, manufacturers can arrange the use of ink more flexibly when manufacturing PCB boards, reducing ink waste due to time constraints, thereby improving ink utilization and production efficiency.

[0025] 3. Guarantee printing quality: During the extended storage period, the ink of the present invention can still maintain stable chemical and physical properties, ensuring that a clear and accurate circuit pattern can be formed during the printing process, thereby ensuring the quality and performance of the PCB board.

[0026] 4. Environmental protection and energy saving: By optimizing the ink formula and preparation process, the ink of the present invention has less impact on the environment during preparation and use, which conforms to the current green and environmentally friendly production concept. At the same time, by reducing the waste of ink, it also indirectly saves resources and energy.

[0027] 5. Easy to prepare and apply: The ink preparation method of the present invention is simple and clear, the raw materials are easily available, and it is easy to realize industrial production. At the same time, the use of the ink is also convenient and fast, and is suitable for the manufacturing needs of various PCB boards. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the structure of the comparative example and the effect comparison diagram of the embodiment of the present invention;

[0029] Figure 2 The development map of the paints of Example 1 and Example 2 of the present invention on the day of their production;

[0030] Figure 3 The development image of the paints of Example 1 and Example 2 of the present invention on the second day;

[0031] Figure 4 This is the development image of the paint of Example 1 and Example 2 of the present invention on the 5th day;

[0032] Figure 5 This is the development image of the paint of Example 1 and Example 2 of the present invention on the 15th day;

[0033] Figure 6 This is the development image of the paint of Example 1 and Example 2 of the present invention on the 30th day;

[0034] Figure 7 The development map of the day when the paint was made for the comparative example 1 of the present invention;

[0035] Figure 8 The development image of the second day of the paint made of comparative example 1 of the present invention;

[0036] Fig. 9 The development image of the day when the paint of comparative example 2 of the present invention was made;

[0037] Fig.10 The second paint of the present invention is made into a developing image on the second day. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention more clear, the following will be combined with the appended drawings of the embodiments of the present invention. Figure 2-6 , clearly and completely describe the technical solutions of the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0039] Embodiment 1

[0040] A PCB ink with a long shelf life, comprising a main agent and a curing agent, measured in parts by weight;

[0041] The main agent includes 23.5 parts of epoxy acrylic resin, 0.3 parts of BASF phthalocyanine green K8730 (used for coloring and enhancing the visual effect of ink), 19.1 parts of silicon dioxide (as a filler to improve the wear resistance and hardness of ink), 2.7 parts of aromatic carbonyl compounds (as reactive substances to participate in the curing reaction), 0.5 parts of phenylimidazole hardener (as a hardener to accelerate the curing process of ink), 4.9 parts of dipropylene glycol monomethyl ether (as a solvent to help adjust the viscosity of ink), 15.2 parts of 3-methoxy-3-methylbutyl ester (as a plasticizer to improve the flexibility and adhesion of ink), and 2.6 parts of diethylene glycol monobutyl ether (also as a solvent to synergize with dipropylene glycol monomethyl ether).

[0042] The curing agent includes 3.8 parts of acrylic monomer, 12.9 parts of epoxy resin (E51) (as the main curing component, providing strength and stability of the ink), 5.7 parts of barium sulfate (as a filler, improving the density and stability of the ink), 7.2 parts of dipropylene glycol monomethyl (synergistically acting with the solvent in the main agent to adjust the viscosity of the curing agent), and 1.6 parts of 3-methoxy-3-methylbutyrate (as a plasticizer, improving the flexibility and adhesion of the curing agent).

[0043] The ink is obtained by mixing the above main agent and curing agent in the above ratio.

[0044] The method for preparing the ink comprises the following steps:

[0045] S1. Weigh the raw materials of the main agent and the curing agent according to the weight ratio for standby use;

[0046] S2. When preparing the main agent, first grind and stir epoxy acrylic resin, BASF phthalocyanine green K8730, silicon dioxide, dipropylene glycol monomethyl ether, 3-methoxy-3-methyl acetate, and a high boiling point solvent (referring to any one of ethoxypropionate, diethylene glycol monobutyl ether, triethylene glycol dimethyl ether, propylene glycol methyl ether propionate, and dipropylene glycol butyl ether with a temperature higher than 150°), and then add aromatic carbonyl compounds and phenylimidazole hardeners in sequence and stir at room temperature to obtain the main agent;

[0047] When preparing the curing agent, firstly grind the acrylic monomer, barium sulfate, dipropylene glycol monomethyl ether, and 3-methoxy-3-methyl acetate and stir them evenly, then add the epoxy resin E51 and stir them evenly at room temperature to obtain the curing agent;

[0048] After the preparation of the main agent and curing agent, they need to be filtered to reduce the raw materials with larger particles, thereby improving the fineness of the main agent or curing agent. The specific filter should be less than 500 mesh;

[0049] After the ink is made, it needs to undergo a photolithography process. The specific steps are as follows:

[0050] Screen printing PCB ink mixture:

[0051] Step description: First, the pre-prepared PCB ink mixture is evenly coated on the treated Cu substrate by screen printing technology. Screen printing technology can ensure that the ink is coated with precise patterns and thicknesses, which is a key step in manufacturing high-quality PCB patterns.

[0052] Effect: Through screen printing, the ink can evenly cover the designated area of ​​the Cu substrate to form a clear pattern outline, laying the foundation for the exposure and development process in the subsequent steps.

[0053] Pre-baking (PAB) 100℃ / 5min:

[0054] Step description: Place the ink-coated Cu substrate on a hot plate for pre-baking at 100°C for 5 minutes. This process is called pre-bake or PAB.

[0055] Effect: The pre-baking process helps to remove the solvent in the ink and make the ink layer more stable. At the same time, it can also reduce the ink flow or deformation that may occur during the subsequent exposure process, ensuring the accuracy and clarity of the pattern.

[0056] S1: Film thickness is controlled to 20μm:

[0057] By adjusting the printing and pre-baking conditions, the ink film thickness after drying is ensured to reach 20 microns.

[0058] Effect: Precise control of film thickness is crucial to the conductivity and insulation properties of PCB. A film thickness of 20 microns can ensure good conductivity while providing sufficient insulation protection to prevent short circuits between circuits.

[0059] S2: UV exposure 150mj / cm 2 :

[0060] The pre-baked Cu substrate was placed in a UV exposure machine for 150 mj / cm 2 of UV exposure.

[0061] Effect: UV exposure causes a chemical reaction in the photosensitive components of the ink, thus changing its solubility. The ink in the exposed area undergoes cross-linking and solidification, remaining in its original state during the subsequent development process, while the unexposed area is dissolved. This process is the key to forming the PCB pattern.

[0062] S3: Use 1% Na 2 CO 3 Soak and develop for 2 minutes:

[0063] The exposed Cu substrate was placed in 1% sodium carbonate (Na 2 CO 3 ) solution for 2 minutes.

[0064] Effect: The development process removes the unexposed ink, leaving the exposed ink as the circuit pattern. The selectivity of the sodium carbonate solution and the control of the development time are crucial to obtaining a clear and complete circuit pattern.

[0065] S4: Deionized water cleaning:

[0066] After development, the Cu substrate is cleaned with deionized water to remove residual developer and impurities.

[0067] Effect: The cleaning process helps ensure the purity and stability of the circuit pattern, preventing possible contamination or corrosion problems in subsequent steps.

[0068] S5: Dry the film in oven at 150℃ / 60min:

[0069] The cleaned Cu substrate is placed in an oven for post-baking at 150°C for 60 minutes, also known as the film hardening process.

[0070] Effect: The post-baking process can further solidify the ink layer, improve its adhesion to the Cu substrate, and improve the overall mechanical strength and heat resistance. This helps ensure the stability and reliability of the PCB during long-term use.

[0071] The above ink is as follows under the developing chart Figure 2 , 3 As shown in Figures 4, 5, and 6, the ink begins to develop incompletely 30 days after mixing, which means that the ink raw materials begin to cross-link. Therefore, the ink can effectively increase the shelf life and reduce ink waste.

[0072] Embodiment 2

[0073] A PCB ink with a long shelf life, comprising a main agent and a curing agent, measured by weight;

[0074] The main agent includes 26 parts of epoxy acrylic resin, 0.4 parts of BASF phthalocyanine green K8730, 19.7 parts of silicon dioxide, 2.9 parts of aromatic carbonyl compounds, 0.6 parts of phenylimidazole hardener, 3.9 parts of dipropylene glycol monomethyl ether, 13.8 parts of 3-methoxy-3-methylbutyl ester, and 2 parts of diethylene glycol monobutyl ether;

[0075] The curing agent includes 4.1 parts of acrylic monomer, 13.4 parts of epoxy resin (E51), 5.9 parts of barium sulfate, 6.1 parts of dipropylene glycol monomethyl, and 1.2 parts of 3-methoxy-3-methylbutyl ester.

[0076] The ink is obtained by mixing the above main agent and curing agent.

[0077] The preparation method and photolithography process of the above ink are the same as those in the first embodiment.

[0078] The above ink is as follows under the developing chart Figure 2 , 3 As shown in Figures 4, 5, and 6, the ink begins to develop incompletely 30 days after mixing, which means that the ink raw materials begin to cross-link. Therefore, the ink can effectively increase the shelf life and reduce ink waste.

[0079] Comparative Example 1

[0080] The main agent includes 23.5 parts of epoxy acrylic resin, 0.3 parts of BASF phthalocyanine green K8730, 19.1 parts of silicon dioxide, 2.7 parts of aromatic carbonyl compound, 0.5 parts of fatty amine hardener, 4.9 parts of dipropylene glycol monomethyl ether, 15.2 parts of 3-methoxy-3-methylbutyl ester, and 2.6 parts of diethylene glycol monobutyl ether;

[0081] The curing agent includes 3.8 parts of acrylic monomer, 12.9 parts of epoxy resin (E51), 5.7 parts of barium sulfate, 7.2 parts of dipropylene glycol monomethyl, and 1.6 parts of 3-methoxy-3-methylbutyl ester.

[0082] The ink obtained by mixing the above main agent and curing agent is as follows under the developing chart: Figure 7 , 8As shown, the ink began to develop poorly one day after mixing, indicating that the ink raw materials began to cross-link.

[0083] Comparative Example 2

[0084] The main agent includes 26 parts of epoxy acrylic resin, 0.4 parts of BASF phthalocyanine green K8730, 19.7 parts of silicon dioxide, 2.9 parts of aromatic carbonyl compounds, 0.6 parts of fatty amine hardener, 3.9 parts of dipropylene glycol monomethyl ether, 13.8 parts of 3-methoxy-3-methylbutyl ester, and 2 parts of diethylene glycol monobutyl ether;

[0085] The curing agent includes 4.1 parts of acrylic monomer, 13.4 parts of epoxy resin (E51), 5.9 parts of barium sulfate, 6.1 parts of dipropylene glycol monomethyl, and 1.2 parts of 3-methoxy-3-methylbutyl ester.

[0086] The ink obtained by mixing the above main agent and curing agent is as follows under the developing chart: Fig. 9 , 10 As shown, the ink began to develop poorly one day after mixing, indicating that the ink raw materials began to cross-link.

[0087] like Figure 1-10 As shown, the addition of phenylimidazole hardener can effectively prolong the storage time of the main agent and the curing agent after mixing, thereby avoiding the waste caused by the ink not being used up within the specified time.

Claims

1. A PCB ink with a long shelf life, comprising a main agent and a curing agent, characterized in that: Servings by weight; The main agent includes 20-30 parts of main agent resin, 0.2-0.5 parts of color powder, 15-20 parts of main agent filling powder, 3-5 parts of initiator, 0.3-0.8 parts of phenylimidazole hardener, and 14-29 parts of main agent organic solvent; The curing agent comprises 12 to 25 parts of curing agent resin, 3 to 8 parts of curing agent filling powder and 6 to 15 parts of curing agent organic solvent.

2. A PCB ink with a long shelf life as claimed in claim 1, characterized in that: The main resin is epoxy acrylic resin.

3. A PCB ink with a long shelf life as claimed in claim 1, characterized in that: The toner is BASF Phthalocyanine Green K8730.

4. A PCB ink with a long shelf life as claimed in claim 1, characterized in that: The main agent filling powder is silicon dioxide.

5. A PCB ink with a long shelf life as claimed in claim 1, characterized in that: The initiator is an aromatic carbonyl compound.

6. A PCB ink with a long shelf life as claimed in claim 1, characterized in that: The main organic solvent includes three types, namely dipropylene glycol monomethyl ether, 3-methoxy-3-methylbutyl ester, and diethylene glycol monobutyl ether.

7. A PCB ink with a long shelf life as claimed in claim 1, characterized in that: The curing agent resin includes two types, namely acrylic monomer and epoxy resin E51.

8. A PCB ink with a long shelf life as claimed in claim 1, characterized in that: The curing agent filling powder is barium sulfate.

9. A PCB ink with a long shelf life as claimed in claim 1, characterized in that: The curing agent organic solvent includes two types, namely dipropylene glycol monomethyl and 3-methoxy-3-methylbutyl ester.

10. A method for preparing a PCB ink with a long shelf life, characterized in that: The method comprises the following steps: S1. Weigh the raw materials of the main agent and the curing agent according to the weight ratio for standby use; S2. When preparing the main agent, first grind and evenly stir epoxy acrylic resin, BASF phthalocyanine green K8730, silicon dioxide, dipropylene glycol monomethyl ether, 3-methoxy-3-methyl acetate, and a high boiling point solvent, then sequentially add an aromatic carbonyl compound and a phenylimidazole hardener and stir evenly at room temperature to obtain the main agent; When preparing the curing agent, firstly grind acrylic monomer, barium sulfate, dipropylene glycol monomethyl ether, and 3-methoxy-3-methyl acetate and stir them evenly, then add high epoxy degree epoxy resin and stir them evenly at room temperature to obtain the curing agent; S3. The main agent and the curing agent are mixed evenly in a weight ratio of 7:3 to obtain a finished ink product.

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