阅读说明：本技术 一种高性能电子产品印制板组装件中性半水基清洗剂及其制备方法和应用 (Neutral semi-water-based cleaning agent for high-performance printed board assembly part of electronic product and preparation method and application thereof ) 是由 崔岩 冯侠 高超 李闯 于 2021-07-02 设计创作，主要内容包括：本发明公开了一种高性能电子产品印制板组装件中性半水基清洗剂,其原料组成成分及重量份数为：二元醇醚酯溶剂30-50份、脂肪族二元醇15-35份、促进剂5-15份、炔二醇活性剂3-10份、苯并三氮唑衍生物0.05-1份、羟基羧酸0.5-3份、DI水补足至100份。本发明清洗剂为均一透明液体,中性产品(pH＝7.50±0.50)；具有优良的高低温稳定性,无闪点,使用、运输和储存安全；不产生泡沫,易漂洗。(The invention discloses a neutral semi-water-based cleaning agent for a high-performance printed board assembly part of an electronic product, which comprises the following raw materials in parts by weight: 30-50 parts of dihydric alcohol ether ester solvent, 15-35 parts of aliphatic dihydric alcohol, 5-15 parts of accelerator, 3-10 parts of alkynediol activator, 0.05-1 part of benzotriazole derivative, 0.5-3 parts of hydroxycarboxylic acid and DI water to make up to 100 parts. The cleaning agent is uniform transparent liquid and a neutral product (pH is 7.50 +/-0.50); the product has excellent high and low temperature stability, no flash point and safe use, transportation and storage; no foam is generated and the rinsing is easy.)

1. A neutral semi-water-based cleaning agent for a high-performance printed board assembly part of an electronic product is characterized in that: the raw materials comprise the following components in parts by weight:

30-50 parts of dihydric alcohol ether ester solvent, 15-35 parts of aliphatic dihydric alcohol, 5-15 parts of accelerator, 3-10 parts of alkynediol activator, 0.05-1 part of benzotriazole derivative, 0.5-3 parts of hydroxycarboxylic acid and DI water to make up to 100 parts.

2. The neutral semi-aqueous cleaning agent for the high performance electronic product printed board assembly of claim 1, wherein: the glycol ether ester solvent is at least one of diethylene glycol ethyl ether acetate, diethylene glycol butyl ether acetate, propylene glycol methyl ether propionate and dipropylene glycol methyl ether acetate.

3. The neutral semi-aqueous cleaning agent for the high performance electronic product printed board assembly of claim 1, wherein: the aliphatic diol is at least one of 1, 2-propylene glycol, 2, 3-butanediol, 1, 2-pentanediol, 1, 5-pentanediol, 2-methyl-2, 4-pentanediol, 1, 2-hexanediol and 2-ethyl-1, 3-hexanediol.

4. The neutral semi-aqueous cleaning agent for the high performance electronic product printed board assembly of claim 1, wherein: the alkynediol active agent is one of butynediol, dimethylhexynediol, dimethyloctynediol and tetramethyldecynediol.

5. The neutral semi-aqueous cleaning agent for the high performance electronic product printed board assembly of claim 1, wherein: the hydroxycarboxylic acid is one of DL-malic acid, 2, 3-dihydroxysuccinic acid and 3-carboxyl-3-hydroxyglutaric acid.

6. The neutral semi-aqueous cleaning agent for high performance electronic product printed board assemblies according to any one of claims 1 to 5, wherein: the accelerator is low molecular liquid amide.

7. The method for preparing the neutral semi-water-based cleaning agent for the high-performance electronic product printed board assembly parts as claimed in any one of claims 1 to 6, wherein the cleaning agent comprises the following components in percentage by weight: the method comprises the following steps:

A. weighing a glycol ether ester solvent, aliphatic diol, an accelerator, an alkynediol active agent, a benzotriazole derivative, hydroxycarboxylic acid and DI water according to a mass ratio;

B. adding the raw materials into a stirring kettle at room temperature, starting stirring at the rotating speed of 100-.

8. Use of the neutral semi-aqueous cleaning agent for the high performance printed circuit board assembly of an electronic product as claimed in any one of claims 1 to 6 in cleaning printed circuit boards of an electronic product.

9. Method for cleaning high performance electronic printed board assemblies with neutral semi-aqueous cleaning agent for high performance electronic printed board assemblies according to any of claims 1 to 6, characterized in that: the method comprises the following steps:

the neutral semi-water-based cleaning agent for the high-performance electronic product printed board assembly is diluted into working solution with the mass concentration of 5% -25% by using DI water, and the printed board assembly is cleaned by using cleaning processes of spray cleaning, manual brushing and ultrasonic cleaning.

Technical Field

The invention belongs to the technical field of radio electronics and telecommunications, and particularly relates to a neutral semi-water-based cleaning agent for a high-performance printed board assembly part of an electronic product, and a preparation method and application thereof.

Background

In recent years, with the rapid development and wide application of integrated circuits, electronic devices have become smaller and smaller, and circuit wiring density has become higher and higher. Electronic products are rapidly developed to the requirements of miniaturization, high integration, high precision and high reliability, which puts higher requirements on the cleaning of printed boards and components.

For circuit boards and precision components in the fields of military industry, aerospace, automotive electronics, instruments and meters and the like, printed boards of surface mounting or through hole insertion are strictly cleaned after reflow soldering, wave soldering or manual soldering so as to remove various residues such as soldering flux, grease dirt and the like, and ensure the long-term stability of the performance of electronic products. Especially, in the printed board currently adopting the surface mounting process, since flux may enter into a fine gap between the surface mount device and the substrate, cleaning is more difficult. The cleaning agent is correctly selected, the corresponding cleaning process is formulated, harmful residues on the printed circuit board are effectively removed, and the cleanness of the cleaned printed circuit board is detected, which is very important for ensuring the quality of electronic products.

In recent years, a class of cleaning agents which are widely applied is a semi-aqueous cleaning agent, the cleaning agent has good compatibility and safe operation, is non-combustible and non-explosive, and has good cleaning effect on polar and non-polar pollutants by matching with physical cleaning means such as heating, brushing, spraying, ultrasonic waves and the like.

At present, in order to ensure the cleaning effect, the semi-water-based soldering flux cleaning agent generally has the defects of strong alkalinity and easy corrosion to a circuit board and cleaning equipment, so that special sensitive functional materials which are stained at the welding spots on the surface of the circuit board after cleaning are easy to oxidize, discolor, swell, deform, fall off and the like. If the spraying cleaning equipment is matched with a cleaning agent with strong alkalinity for a long time, parts such as a nozzle in the spraying liquid box and the like are easy to corrode. Working liquid of some cleaning agents can generate higher foam when being sprayed for use, cannot be matched with spraying cleaning equipment for use, is only suitable for manual brushing, and reduces the production efficiency, thereby limiting the wide application of the products in the aspect of cleaning integrated circuits and electronic components.

Through searching, the following three patent publications related to the patent application of the invention are found:

1. a cleaning process method of a flexible printed circuit board and a cleaning agent composition (CN108207087A) thereof are disclosed, wherein a soldering flux cleaning agent consists of 80-85% of fatty alcohol-polyoxyethylene ether and 15-20% of 1,2, 3, 4-tetrahydronaphthalene in percentage by mass. The high-efficiency cleaning agent comprises the following components in percentage by mass: 1-3 parts of phosphate ester salt, 2-5 parts of sulfate ester salt, 1-3 parts of zinc chloride, 3-10 parts of fatty alcohol-polyoxyethylene ether sodium sulfate, 3-6 parts of methyl benzotriazole, 10-15 parts of hydrochloric acid, 1-2 parts of EDTA (ethylene diamine tetraacetic acid), 1-3 parts of emulsifier, 1-5 parts of nonionic surfactant and 50-80 parts of deionized water. The cleaning process comprises the steps of ethanol pre-cleaning, ethanol ultrasonic cleaning, air drying, soldering flux cleaning agent ultrasonic cleaning, deionized water ultrasonic rinsing, high-efficiency cleaning agent ultrasonic cleaning, electric brush scrubbing local part, ethanol ultrasonic rinsing and air drying. The invention strictly utilizes the ultrasonic cleaning principle, and prepares the cleaning agent in a targeted manner, wherein the cleaning process relates to three types of cleaning agents, namely ethanol cleaning agent, scaling powder cleaning agent and high-efficiency cleaning agent. By contrast, the invention can adopt various cleaning modes such as ultrasonic cleaning, spray cleaning, manual brushing and the like, and can realize effective cleaning by adopting the process steps of cleaning by using a cleaning agent, rinsing by RO water and drying.

2. The flexible circuit board cleaning agent comprises the following components in percentage by mass: 30-45% of N-methyl pyrrolidone, 20-35% of butyrolactone, 1.5-3% of carboxylic acid complexing agent, 0.5-2% of penetrating agent and the balance of water, and the adopted cleaning process is ultrasonic cleaning. By contrast, the invention can adopt various cleaning modes such as ultrasonic cleaning, spray cleaning, manual brushing and the like, and the cleaning agent can be diluted by DI water to be 5-25% of working solution for use.

3. A cleaning agent for cleaning a circuit board and a preparation method (CN 104371838A) thereof are disclosed, wherein the cleaning agent comprises the following components in percentage by mass: 10-15 parts of coconut diethanolamide, 4-6 parts of diethylene glycol monobutyl ether, 3-5 parts of polyoxyethylene ether, 2-4 parts of benzotriazole, 2-3 parts of isobutanol, 1-2 parts of tetrafluoropropanol, 1-2 parts of EDTA (ethylene diamine tetraacetic acid), 1-2 parts of sodium citrate, 1-2 parts of sodium tripolyphosphate, 1-2 parts of potassium lauryl ether phosphate and 50-60 parts of deionized water. By contrast, the cleaning agent disclosed by the invention does not contain halogen such as fluorine, chlorine and the like, does not contain phosphorus, can be diluted by 5-25% of working solution by using DI water, and is essentially different from the patent publication documents.

By contrast, the present patent application differs essentially from the above patent publications.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides a neutral semi-water-based cleaning agent for a high-performance printed board assembly part of an electronic product, and a preparation method and application thereof.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a neutral semi-water-based cleaning agent for a high-performance printed board assembly part of an electronic product comprises the following raw materials in parts by weight:

30-50 parts of dihydric alcohol ether ester solvent, 15-35 parts of aliphatic dihydric alcohol, 5-15 parts of accelerator, 3-10 parts of alkynediol activator, 0.05-1 part of benzotriazole derivative, 0.5-3 parts of hydroxycarboxylic acid and DI water to make up to 100 parts.

Further, the glycol ether ester solvent is at least one of diethylene glycol ethyl ether acetate, diethylene glycol butyl ether acetate, propylene glycol methyl ether propionate and dipropylene glycol methyl ether acetate.

The aliphatic diol is at least one of 1, 2-propanediol, 2, 3-butanediol, 1, 2-pentanediol, 1, 5-pentanediol, 2-methyl-2, 4-pentanediol, 1, 2-hexanediol, and 2-ethyl-1, 3-hexanediol.

Further, the alkynediol active agent is one of butynediol, dimethylhexynediol, dimethyloctynediol and tetramethyldecynediol.

Further, the hydroxycarboxylic acid is one of DL-malic acid, 2, 3-dihydroxysuccinic acid and 3-carboxy-3-hydroxyglutaric acid.

Further, the accelerator is a low molecular liquid amide.

The preparation method of the neutral semi-water-based cleaning agent for the high-performance printed circuit board assembly of the electronic product comprises the following steps:

A. weighing a glycol ether ester solvent, aliphatic diol, an accelerator, an alkynediol active agent, a benzotriazole derivative, hydroxycarboxylic acid and DI water according to a mass ratio;

B. adding the raw materials into a stirring kettle at room temperature, starting stirring at the rotating speed of 100-.

The neutral semi-water-based cleaning agent for the high-performance printed circuit board assembly of the electronic product is applied to cleaning of the printed circuit board of the electronic product.

The method for cleaning the high-performance electronic product printed board assembly by using the neutral semi-water-based cleaning agent for the high-performance electronic product printed board assembly is characterized by comprising the following steps of: the method comprises the following steps:

the neutral semi-water-based cleaning agent for the high-performance electronic product printed board assembly is diluted into working solution with the mass concentration of 5% -25% by using DI water, and the printed board assembly is cleaned by using cleaning processes of spray cleaning, manual brushing and ultrasonic cleaning.

The invention has the advantages and positive effects that:

1. the cleaning agent is uniform transparent liquid and a neutral product (pH is 7.50 +/-0.50); the product has excellent high and low temperature stability, no flash point and safe use, transportation and storage; no foam is generated and the rinsing is easy.

2. The cleaning agent disclosed by the invention can effectively remove lead-containing or lead-free soldering flux residues by matching with cleaning modes such as spray cleaning, manual scrubbing, ultrasonic cleaning and the like. Because a single component has limited cleaning effect on a plurality of soldering fluxes, the soldering flux adopts a compound combination containing a plurality of effective structures to specifically remove polar and non-polar components in residues of the soldering flux. For example, the oxygen-containing groups promote hydrogen bond formation with carboxylic acid groups in the flux residue; the short-chain and multi-chain structure compounds help to break up the crystal structure of the flux. The promoter promotes penetration and wetting of the cleaning agent between fine pitch components while preventing redeposition of flux solids during the rinsing step.

3. The cleaning agent of the invention has good compatibility to common components or materials, but is not suitable for cleaning aluminum-magnesium alloy.

4. The cleaning agent disclosed by the invention does not contain toxic and harmful substances such as halogen, aromatic hydrocarbon and the like, ozone layer consumption and global warming substances, does not contain harmful air pollutants limited in the air cleaning Law, accords with the EU RoHS instruction, is harmless to human bodies, is environment-friendly, and can ensure the effectiveness, reliability and safety of cleaning electronic products.

5. DI water is used for diluting the cleaning agent into working solution with a certain concentration, so that the cleaning agent has better economical efficiency. The production equipment and the process are simple and easy to realize.

6. The cleaning agent is a neutral product, is designed for lead-containing and lead-free soldering paste, can effectively remove scaling powder residues, oil stains, dust and other pollutants attached to the surfaces of circuit boards and electronic components, and has a good cleaning effect; the cleaning equipment is not corroded, and the compatibility of the cleaning equipment to common electronic components and materials is good; therefore, the neutral semi-water-based cleaning agent can guarantee the effectiveness, reliability and safety of cleaning of electronic products.

Drawings

FIG. 1 is a report of the testing of a product according to the present invention;

FIG. 2 is a RoHS test report in accordance with the present invention.

Detailed Description

The following detailed description of the embodiments of the present invention is provided for the purpose of illustration and not limitation, and should not be construed as limiting the scope of the invention.

The raw materials used in the invention are conventional commercial products unless otherwise specified; the methods used in the present invention are conventional in the art unless otherwise specified.

A neutral semi-water-based cleaning agent for a high-performance printed board assembly part of an electronic product comprises the following raw materials in parts by weight:

30-50 parts of dihydric alcohol ether ester solvent, 15-35 parts of aliphatic dihydric alcohol, 5-15 parts of accelerator, 3-10 parts of alkynediol activator, 0.05-1 part of benzotriazole derivative, 0.5-3 parts of hydroxycarboxylic acid and DI water to make up to 100 parts.

Preferably, the glycol ether ester solvent is at least one of diethylene glycol ethyl ether acetate, diethylene glycol butyl ether acetate, propylene glycol methyl ether propionate and dipropylene glycol methyl ether acetate.

Preferably, the aliphatic diol is at least one of 1, 2-propanediol, 2, 3-butanediol, 1, 2-pentanediol, 1, 5-pentanediol, 2-methyl-2, 4-pentanediol, 1, 2-hexanediol, and 2-ethyl-1, 3-hexanediol.

Preferably, the alkynediol active agent is one of butynediol, dimethylhexynediol, dimethyloctynediol, and tetramethyldecynediol.

Preferably, the hydroxycarboxylic acid is one of DL-malic acid, 2, 3-dihydroxysuccinic acid, and 3-carboxy-3-hydroxyglutaric acid.

Preferably, the accelerator is a low molecular weight liquid amide.

The preparation method of the neutral semi-water-based cleaning agent for the high-performance printed circuit board assembly of the electronic product comprises the following steps:

A. weighing a glycol ether ester solvent, aliphatic diol, an accelerator, an alkynediol active agent, a benzotriazole derivative, hydroxycarboxylic acid and DI water according to a mass ratio;

B. adding the raw materials into a stirring kettle at room temperature, starting stirring at the rotating speed of 100-.

The neutral semi-water-based cleaning agent for the high-performance printed circuit board assembly of the electronic product is applied to cleaning of the printed circuit board of the electronic product.

The method for cleaning the high-performance electronic product printed board assembly by using the neutral semi-water-based cleaning agent for the high-performance electronic product printed board assembly is characterized by comprising the following steps of: the method comprises the following steps:

the neutral semi-water-based cleaning agent for the high-performance electronic product printed board assembly is diluted into working solution with the mass concentration of 5% -25% by using DI water, and the printed board assembly is cleaned by using cleaning processes of spray cleaning, manual brushing and ultrasonic cleaning.

Specifically, the preparation and detection examples are as follows:

example 1

A neutral semi-water-based cleaning agent for a high-performance printed board assembly part of an electronic product comprises the following raw materials in percentage by weight:

45% of propylene glycol methyl ether acetate, 25% of 2-methyl-2, 4-pentanediol, 10% of an accelerator, 8% of tetramethyl decyne glycol, 0.5% of benzotriazole derivative, 1% of DL-malic acid and the balance of DI water.

The preparation method of the neutral semi-water-based cleaning agent for the high-performance printed board assembly part of the electronic product comprises the following steps:

weighing propylene glycol methyl ether acetate, 2-methyl-2, 4-pentanediol, an accelerator, tetramethyl decyne glycol, a benzotriazole derivative, DL-malic acid and DI water according to a mass ratio; adding the raw materials into a stirring kettle at room temperature, starting stirring at the rotation speed of 200r/min for 45min, and uniformly mixing to obtain the neutral semi-water-based cleaning agent for the high-performance printed circuit board assembly, wherein the pH value (stock solution, 25 ℃) of the cleaning agent is 7.50.

Cleaning the three groups of printed board assembly parts in a spray cleaning mode, and performing the following steps:

diluting neutral semi-water-based cleaning agent into 20% working solution by using DI water, and uniformly mixing; the technological process and technological parameters of cleaning are determined as shown in Table 1, the empty machine is required to circulate for 10-30min before cleaning, and meanwhile, a proper filter is installed to remove solid particles such as the cleaned solder balls and welding slag.

TABLE 1 cleaning Process steps and parameters

The cleaned assembly part is visually inspected by using a three-visual measuring microscope under the magnification of 30 times, and the cleaning agent and the cleaning process can effectively remove lead-containing or lead-free soldering flux residues and have good compatibility with electronic components such as component marks, coating layers, plastics, elastomers and the like.

Performing ion contamination test on the cleaned circuit board by using an ion contamination degree tester to obtain sodium chloride contents of 0.94 mu g (NaCl) per cm in unit area representing the contamination degree of the electronic component²、0.16μg(NaCl)/cm²、0.54μg(NaCl)/cm²。

The cleaning agent is used for carrying out short-term exposure compatibility test on common components in electronic products. The cleaning agent can not cause the discoloration of metal alloys such as copper alloy, silver plating layer and the like or the falling of part marks, has good compatibility to common components or materials, but is not suitable for cleaning aluminum-magnesium alloy.

Example 2

A neutral semi-water-based cleaning agent for a high-performance printed board assembly part of an electronic product comprises the following components in percentage by weight:

dipropylene glycol methyl ether acetate 40%, 1, 2-hexanediol 20%, accelerator 12%, dimethyl octynediol 6%, benzotriazole derivative 0.5%, 2, 3-dihydroxy succinic acid 1.5%, and the balance of DI water.

The preparation method of the neutral semi-water-based cleaning agent for the high-performance printed board assembly part of the electronic product comprises the following steps:

weighing dipropylene glycol methyl ether acetate, 1, 2-hexanediol, an accelerator, dimethyl octynediol, a benzotriazole derivative, 2, 3-dihydroxy succinic acid and DI water according to a mass ratio; adding the raw materials into a stirring kettle at room temperature, starting stirring at the rotation speed of 200r/min for 45min, and uniformly mixing to obtain the neutral semi-water-based cleaning agent for the printed board assembly of the high-performance electronic product, wherein the pH value (stock solution, 25 ℃) of the cleaning agent is 7.46.

Adopt manual scrubbing to wash experimental, will with DI water the cleaner dilutes to 15% working solution, with the slope of circuit board subassembly, dips in proper amount working solution (45 ℃) with preventing static brush, with circuit board subassembly from high to low, brush backward in the past, use DI water to rinse the circuit board clean after the washing, detect after weathering.

The cleaned assembly is visually inspected by using a three-visual measuring microscope under the magnification of 30 times, the cleaning agent and the cleaning process can effectively remove pollutants such as residual soldering flux, oil stains, fingerprints and dust, and the surfaces of metal and non-metal materials on the cleaned electronic components are free of corrosion. The cleaning effectiveness, reliability and safety of the electronic product can be guaranteed.

The relevant detection is shown in fig. 1 and 2. The test results in FIG. 1 show that: the developed cleaning agent is a uniform transparent liquid and a neutral product (pH is 7.50 +/-0.50); has excellent high and low temperature stability, no flash point and safe use, transportation and storage. The cleaning modes such as spray cleaning or manual scrubbing and the like are adopted, so that lead-containing or lead-free washing-free or rosin tin paste residues can be effectively removed. Because a single component has limited cleaning effect on a plurality of soldering fluxes, the developed soldering flux adopts a combination of organic compounds with a plurality of effective structures to specifically remove nonpolar components in residues of the soldering flux. For example, the oxygen-containing groups promote hydrogen bond formation with carboxylic acid groups in the flux residue; the short-chain and multi-chain structure compounds help to break up the crystal structure of the flux. Certain functional additives can promote penetration and wetting of cleaning agents between fine pitch components while preventing re-deposition of flux solids during the rinsing step. The developed cleaning agent shows good compatibility to common components or materials, does not cause the discoloration of copper alloy and silver plating layers or the falling off of component marks, and shows good compatibility to the materials.

The detection result of FIG. 2 in the figure of the specification shows that: the developed cleaning agent conforms to the RoHS instruction of European Union, is harmless to human bodies and is environment-friendly.

Although the embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that: various substitutions, changes and modifications are possible without departing from the spirit and scope of the invention and the appended claims, and therefore the scope of the invention is not limited to the embodiments disclosed.