阅读说明：本技术 一种印刷线路板显影添加剂 (Printed circuit board developing additive ) 是由 李初荣 陈钜 韦金宇 夏海 于 2021-09-10 设计创作，主要内容包括：本发明公开了一种印刷线路板显影添加剂,涉及印刷线路板生产技术领域。该添加剂包括以下组分：质量分数3-15%的显影加速剂；质量浓度100-4000ppm的润湿剂；质量浓度50-2000ppm的铜面稳定剂。本发明提供的印刷线路板显影添加剂,以显影加速剂、润湿剂、铜面稳定剂复配,得到的显影添加剂可直接添加至原显影槽液中使用,添加之后,显影工序的生产速度能提高20-40%,品质稳定,膜屑反沾、缺口、显影不净等品质问题改善明显,使用成本低,环保无污染,废液处理容易,无毒无害。(The invention discloses a printed circuit board developing additive, and relates to the technical field of printed circuit board production. The additive comprises the following components: 3-15% by mass of a development accelerator; wetting agent with mass concentration of 100-4000 ppm; the mass concentration of the copper surface stabilizer is 50-2000 ppm. The printed circuit board developing additive provided by the invention is compounded by a developing accelerator, a wetting agent and a copper surface stabilizer, the obtained developing additive can be directly added into the original developing tank solution for use, after the addition, the production speed of the developing process can be increased by 20-40%, the quality is stable, the quality problems of film chip reverse adhesion, gap, incomplete development and the like are obviously improved, the use cost is low, the environment is protected, no pollution is caused, the waste liquid is easy to treat, and the printed circuit board developing additive is non-toxic and harmless.)

1. The printed circuit board developing additive is characterized by comprising the following components:

3-15% by mass of a development accelerator;

wetting agent with mass concentration of 100-4000 ppm;

the mass concentration of the copper surface stabilizer is 50-2000 ppm.

2. The printed wiring board developer additive of claim 1, wherein the development accelerator is selected from at least one of diethylenetriaminepentaacetic acid, acetic acid, triethanolamine.

3. The printed wiring board developer additive according to claim 1, wherein the wetting agent is at least one selected from the group consisting of monohydric alcohols, dihydric alcohols, and trihydric alcohols having 2 to 6 carbon atoms.

4. The printed wire additive of claim 1 wherein the copper surface stabilizer is selected from at least one of oxalic acid, malic acid, succinic acid, tartaric acid, and citric acid.

5. The printed wiring board developer additive according to claim 1, wherein the development accelerator is present in an amount of 5 to 12% by weight.

6. The printed wiring board developer additive according to claim 5, wherein the development accelerator is present in an amount of 8 to 12% by weight.

7. The printed wiring board developing additive of claim 1, wherein the wetting agent has a mass concentration of 200-2000 ppm.

8. The printed wiring board developing additive of claim 7, wherein the wetting agent has a mass concentration of 600-1000 ppm.

9. The printed wiring board developing additive of claim 1, wherein the mass concentration of the copper surface stabilizer is 100-1000 ppm.

10. The printed wiring board developing additive of claim 9, wherein the mass concentration of the copper surface stabilizer is 400-800 ppm.

Technical Field

The invention relates to the technical field of printed circuit board production, in particular to a developing additive of a printed circuit board.

Background

The conventional printed circuit board mainly focuses on the problems of conduction, short circuit, insulation and the like of metal wires, but with the pursuit of high performance of electronic products, the requirements of lightness, thinness, shortness, smallness and digitalization of the electronic products become the main targets at the present stage. Miniaturization, multifunction, high performance and high reliability become the mainstream development direction, products of the printed circuit board are oriented to fine patterns, high density and high multilayering, and the line width and the line distance in industrial production are particularly important. Photoimaging is a process in which a photoresist coated on a printed wiring board substrate is exposed to light to change its hardness, adhesion, solubility, and physical properties, and then developed to form an image. The photoresist dry film is a foundation stone of a modern printed circuit board, and the photoresist dry film is popular with various printed circuit board manufacturers since the world due to the characteristics of simple process flow, low requirement on cleanliness and easy operation, and becomes a main process flow process for pattern transfer of multilayer boards, FPC (flexible printed circuit), rigid-flexible printed circuit) boards and HDI (high density interconnection) boards after improvement and development.

After the printed circuit board is manufactured by sticking a dry film (polypropylene monomer) -exposing, weak alkali Na is needed₂CO₃(0.8% -1.2%) or K₂CO₃(0.8% -1.2%) to complete the pattern transfer. The principle of development is to use Na₂CO₃And the active groups of the unexposed part of the photoresist organic carboxyl-COOH and Na₂CO₃The Na ions of the solution are subjected to repeated decomposition reaction to generate soluble organic salt COONa, and the dry film of the exposed part is not dissolved, so that the dry film is remained.

The developing solution used at present has a low developing speed under normal developing parameters, is easy to have the quality problems of film chip reverse sticking, more gaps, unclean development and the like in production, and has high production cost; the solution contains ammonia nitrogen substances, and has great harm to the environment.

Disclosure of Invention

The invention aims to solve the technical problems that the components contained in the existing developing additive have great harm to the environment, and the defects of film scrap reverse sticking, more gaps and unclean development exist in the use process.

In order to solve the above problems, the present invention proposes the following technical solutions:

a printed wiring board developer additive comprising the following components:

3-15% by mass of a development accelerator;

wetting agent with mass concentration of 100-4000 ppm;

the mass concentration of the copper surface stabilizer is 50-2000 ppm.

The developing accelerator is further characterized in that the developing accelerator is at least one selected from diethylenetriaminepentaacetic acid, acetic acid and triethanolamine.

The further technical proposal is that the wetting agent is selected from at least one of monohydric alcohol, dihydric alcohol and trihydric alcohol with the carbon atom number of 2-6.

The further technical scheme is that the copper surface stabilizer is at least one selected from oxalic acid, malic acid, succinic acid, tartaric acid and citric acid.

The further technical scheme is that the mass fraction of the developing accelerator is 5-12%.

The further technical scheme is that the mass fraction of the developing accelerator is 8-12%.

The further technical proposal is that the mass concentration of the wetting agent is 200-2000 ppm.

The further technical proposal is that the mass concentration of the wetting agent is 600-1000 ppm.

The technical scheme is that the mass concentration of the copper surface stabilizer is 100-1000 ppm.

The further technical proposal is that the mass concentration of the copper surface stabilizer is 400-800 ppm.

The addition amount of the printed circuit board developing additive provided by the invention only needs to be directly added into the original developing tank solution, and the addition amount is 0.05-0.1% (mass fraction), preferably 0.05-0.07%, so that the problems of film chip anti-sticking, notch, incomplete development and the like can be improved.

The novel developing additive provided by the invention has the cylinder opening amount of 0.05-0.1%, is added according to the number of production plates, is automatically added according to the proportion concentration of 0.05-0.1%, and is convenient to operate.

Compared with the prior art, the invention can achieve the following technical effects:

the printed circuit board developing additive provided by the invention is compounded by a developing accelerator, a wetting agent and a copper surface stabilizer, the obtained developing additive can be directly added into the original developing tank solution for use, after the addition, the production speed of the developing process can be increased by 20-40%, the quality is stable, the quality problems of film chip reverse adhesion, gap, incomplete development and the like are obviously improved, the use cost is low, the environment is protected, no pollution is caused, the waste liquid is easy to treat, and the printed circuit board developing additive is non-toxic and harmless.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a graph of test results under two copper and tin plating test conditions in a plating resistance test;

fig. 2 is a graph showing the test results under the immersion tin test condition in the plating resistance test.

Detailed Description

The technical solutions in the embodiments will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, wherein like reference numerals represent like elements in the drawings. It is apparent that the embodiments to be described below are only a part of the embodiments of the present invention, and not all of them. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It is also to be understood that the terminology used in the description of the embodiments of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the invention. As used in the description of embodiments of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

The embodiment of the invention provides a printed circuit board developing additive which comprises the following components:

3-15% by mass of a development accelerator; wetting agent with mass concentration of 100-4000 ppm; the mass concentration of the copper surface stabilizer is 50-2000 ppm.

The developing accelerator is at least one selected from diethylenetriaminepentaacetic acid, acetic acid and triethanolamine.

The wetting agent is selected from at least one of monohydric alcohol, dihydric alcohol and trihydric alcohol with the carbon atom number of 2-6.

The copper surface stabilizer is at least one selected from oxalic acid, malic acid, succinic acid, tartaric acid and citric acid.

As a preferred embodiment, the mass fraction of the development accelerator is 5 to 12%. More preferably, the mass fraction of the development accelerator is 8 to 12%.

As a preferred embodiment, the mass concentration of the wetting agent is 200-2000 ppm. More preferably, the mass concentration of the wetting agent is 600-1000 ppm.

As a preferred embodiment, the mass concentration of the copper surface stabilizer is 100-1000 ppm. More preferably, the mass concentration of the copper surface stabilizer is 400-800 ppm.

The following are specific examples and effect verification tests

(1) And (3) testing beakers, configuring development additive examples and comparative examples with different composition ratios according to the following table 1, respectively measuring 100ml of developing tank liquid by using two beakers, adding 0.05-0.07% (mass fraction) of development additive, fully stirring, then adding 50% (mass fraction) of sulfuric acid, observing for 3 minutes, and visually observing whether dry film precipitation, liquid medicine turbidity, liquid medicine layering and copper surface corrosion conditions exist. The test results are shown in Table 2.

TABLE 1 developer additives of different composition ratios

TABLE 2 beaker test results

Wherein, the blank comparative example is that a beaker contains 100ml of developing solution, 50 percent (mass fraction) of sulfuric acid and no developing additive is added.

(2) And corrosion testing, namely adhering exposed and unexposed dry films and ink on the board surface, placing a 10cm by 10cm test board with the ink or the dry films in a beaker, taking 50ml of 100% developing additive solution of the example 1, pouring the solution into the beaker with the test board, taking out the test board after placing for 30min, observing the appearance of the board surface, and observing whether the board surface is corroded. The results are shown in Table 3.

TABLE 3 Corrosion test results

(3) Plating resistance test, test method 1: the developer additive of example 1, which was applied uniformly on the test board at a concentration of 1%, was washed with water and then electroplated or tin-dipped to confirm the electroplating and tin-dipping conditions of the test board, the tin surface required no copper exposure and the tin surface was uniform. The results are shown in Table 4.

The test method 2: the developing additive of example 1 with a concentration of 2-6% was uniformly applied on the test boards, and after washing with water, the test boards were electroplated or tinned to confirm the electroplating and tinning conditions of the test boards, and the tin surfaces were required to be uniform without copper exposure. The results are shown in Table 5.

TABLE 4 plating resistance test result 1

TABLE 5 plating resistance test results 2

(4) On-line testing, the developing solution in the developing tank and the developing additive of example 1 were prepared according to the ratio of table 6, test boards with different line widths/line distances were processed at 25 ℃, and the board surface was inspected for film chip reverse sticking and chipping after the processes of mass production, developing, electroplating and etching. The test results are shown in Table 7.

TABLE 6 developer tank liquor ratio

TABLE 7 results of on-line testing

In conclusion, the developing additive for the printed circuit board provided by the invention is environment-friendly, soluble in water and easy to clean; the developing additive has obvious effects on the aspects of improving the developing speed, improving the reverse adhesion of film scraps, reducing gaps and incomplete developing, has outstanding advantages compared with the developing additive for commercial circuit board factories at present, is more environment-friendly, has obvious improved quality, low cost and easy operation, and is widely suitable for various circuit board production enterprises.

In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

While the invention has been described with reference to specific embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.