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Acid etching liquid and preparation method thereof

An acid etching solution and hydrochloric acid technology, applied in the field of metal etching, can solve the problems of unstable etching rate and poor etching uniformity, and achieve the effects of fast etching speed, small equipment corrosion, safe and environmentally friendly operation

Inactive Publication Date: 2018-01-19
佛山市华希盛化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In the existing acid etching solution technology, inorganic compounds are generally used for compounding, resulting in unstable etching rate and poor etching uniformity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0024] The invention proposes a preparation method of an acidic etching solution, which is suitable for printed circuit boards, so as to be more effectively used for etching and forming copper surfaces in the production of printed circuit boards.

[0025] The technical means of the preparation method of the acid etching solution for printed circuit boards of the present invention is to adopt an alternative chemical substance with the same effect under the condition that the principle of action remains unchanged through the adjustment of the formula components, so that it has new characteristics and advantages in terms of performance. effect.

[0026] The technical scheme of the method for preparing the acid etching solution for printed circuit boards of the present invention is to mix the chemical components together in a certain proportion, mix the used raw materials uniformly in a certain order, react for a certain period of time, and then finish the reaction. The product is...

Embodiment 1

[0035] 100mL acidic etching solution and its preparation method:

[0036] Sodium chlorate: 20g

[0037] Refined salt: 17g

[0038] Ammonium chloride: 4g

[0039] Additive: 1.5g

[0040] Concentrated hydrochloric acid: 1mL

[0041] The balance is water.

[0042] Add sodium chlorate, refined salt, ammonium chloride and additives (ureas, including urea, thiourea, dithiourea, etc.) acid etchant.

[0043] The parameter of gained etching solution is as follows:

[0044] Specific gravity: 1.25~1.35

[0045] pH: 6~9

[0046] Chloride ion content: 220~280g / L

[0047] In addition, it should be noted that when using this acidic etching solution, it is required to control the copper ion content of the use environment to be 140-170g / L, and the oxidation-reduction potential to be 500-550mV.

Embodiment 2

[0049] 1000L acid etching solution and its preparation method:

[0050] Sodium chlorate: 250Kg

[0051] Refined salt: 95Kg

[0052] Ammonium chloride: 30Kg

[0053] Additives: 12Kg

[0054] Concentrated hydrochloric acid: the concentration is 31%, less than 10Kg

[0055] The balance is water.

[0056] Add sodium chlorate, refined salt, ammonium chloride and additives (urea, including urea, thiourea, dithiourea, etc.) , to obtain an acidic etchant.

[0057] The parameter of gained etching solution is as follows:

[0058] Specific gravity: 1.25~1.35

[0059] pH: 6~9

[0060] Chloride ion content: 220~280g / L

[0061] In addition, it should be noted that: the same requirements as in Example 1, when using this acidic etching solution, it is required to control the copper ion content to 140-170g / L, and the oxidation-reduction potential to be 500-550mV.

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PUM

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Abstract

The invention discloses an acid etching liquid. The acid etching liquid comprises the following components: sodium chlorate, refined salt, ammonium chloride, hydrochloric acid and an additive agent, wherein the additive agent is one or several of ureas. The acid etching liquid provided by the invention has the benefits as follows: the corrosion to the equipment is little due to the medium-low acidconcentration during the using process, the using cost is low, the operation is safe and environment-friendly, the detection and control system is simple, peroxides are not contained, the operation is safe and reliable, the lateral erosion is little, the production of compact and fine circuit boards is facilitated, the etching speed is higher and automatically controlled, and the stability is good.

Description

technical field [0001] The invention belongs to the technical field of metal etching, in particular to an acid etching solution and a preparation method thereof, in particular to an acid etching solution for metal copper on a printed circuit board. Background technique [0002] The printed circuit board is an important electronic component and a carrier for the electrical connection of electronic components. With the development of modern science, the development level of printed circuit boards is an important symbol to measure the electronic information level of a country. [0003] The quality of printed circuit boards is directly related to the quality and service life of electronic equipment. If electronic equipment is used for civilian products, it is related to thousands of households. [0004] Etching solutions are divided into acidic type and alkaline type. It is mainly used to etch the copper surface on the substrate into a line shape. The main types of acid etchi...

Claims

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Application Information

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IPC IPC(8): C23F1/18
Inventor 谭奇亮余欣荣蒙昌才詹校东蒙筱青
Owner 佛山市华希盛化工有限公司
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