阅读说明：本技术 一种水基型柔性线路板清洗剂及其制备方法 (Water-based flexible circuit board cleaning agent and preparation method thereof ) 是由 张呈波 范从国 秦旺洋 于 2019-09-11 设计创作，主要内容包括：本发明公开了一种水基型柔性线路板清洗剂,水基型柔性线路板清洗剂包括以下组分：醇醚溶剂30～50％；四氢糠醇0～10％；N-乙基吡咯烷酮0～10％；醇胺3～16％；助剂1～3％；离子表面活性剂5～15％；去离子水余量。本发明制备的水基型柔性线路板清洗剂为弱碱性浓缩型清洗剂,配方中不含任何氟碳溶剂和卤代烃溶剂,VOC可挥发性有机物含量低,气味小,毒性低,且使用方便,操作安全；通过超声清洗方法,能够显著提高柔性线路板的清洁效率,提升可靠性。(The invention discloses a water-based flexible circuit board cleaning agent which comprises the following components: 30-50% of an alcohol ether solvent; 0-10% of tetrahydrofurfuryl alcohol; 0-10% of N-ethyl pyrrolidone; 3-16% of alcohol amine; 1-3% of an auxiliary agent; 5-15% of an ionic surfactant; the balance of deionized water. The water-based flexible circuit board cleaning agent prepared by the invention is a weakly alkaline concentrated cleaning agent, does not contain any fluorocarbon solvent and halogenated hydrocarbon solvent in the formula, has low content of Volatile Organic Compounds (VOC), small smell and low toxicity, and is convenient to use and safe to operate; by the ultrasonic cleaning method, the cleaning efficiency of the flexible circuit board can be obviously improved, and the reliability is improved.)

1. The water-based flexible circuit board cleaning agent is characterized by comprising the following components:

2. the water-based cleaning agent for flexible circuit boards as claimed in claim 1, wherein the alcohol ether solvent is selected from the group consisting of dipropylene glycol monomethyl ether, dipropylene glycol dimethyl ether, and dipropylene glycol propyl ether.

3. The water-based cleaning agent for flexible circuit boards as claimed in claim 2, wherein the alcohol ether solvent further comprises one or more of dipropylene glycol butyl ether, ethylene glycol phenyl ether and propylene glycol phenyl ether.

4. The water-based cleaning agent for the flexible circuit board according to claim 2 or 3, wherein the ratio of dipropylene glycol monomethyl ether, dipropylene glycol dimethyl ether, dipropylene glycol propyl ether, dipropylene glycol butyl ether, ethylene glycol phenyl ether and propylene glycol phenyl ether is 1: 1-2: 0.5-1: 0-0.5: 0-0.2: 0-0.5.

5. The water-based cleaning agent for the flexible circuit board according to claim 1, wherein: the ionic surfactant is selected from two or three of sodium dodecyl sulfate, sodium dodecyl benzene sulfonate and hexadecyl sulfo phenoxy benzene sulfonic acid disodium salt; the weight ratio of the sodium dodecyl sulfate to the sodium dodecyl benzene sulfonate to the hexadecyl sulfo phenoxy benzene sulfonic acid disodium salt is 1: 0-0.5: 1-2.

6. The water-based cleaning agent for the flexible circuit board according to claim 1, wherein the alcohol amine is one or more selected from 2-amino-2-methyl-1-propanol, monoisopropanolamine and N, N-dimethylcyclohexylamine, and the weight ratio of the 2-amino-2-methyl-1-propanol, the monoisopropanolamine and the N, N-dimethylcyclohexylamine is 1: 0-0.5: 0-0.2.

7. The water-based flexible circuit board cleaning agent as claimed in claim 1, wherein the auxiliary agent in the water-based flexible circuit board cleaning agent comprises a corrosion inhibitor and a complexing agent, the corrosion inhibitor is benzotriazole, and the complexing agent is sodium gluconate.

8. The preparation method of the water-based flexible circuit board cleaning agent as claimed in any one of claims 1 to 7, characterized by comprising the following steps:

adding an alcohol ether solvent, tetrahydrofurfuryl alcohol and N-ethyl pyrrolidone into a reaction kettle at the rotating speed of 500r/m, uniformly stirring, dissolving an appropriate amount of an ionic surfactant into deionized water, uniformly mixing and stirring with the solution according to a certain proportion, finally adding benzotriazole and a sodium gluconate auxiliary agent, and stirring to obtain a clear and stable solution.

Technical Field

The invention relates to the technical field of flexible circuit board cleaning agents, in particular to a water-based flexible circuit board cleaning agent and a preparation method thereof.

Background

Along with the development of the electronic information industry towards miniaturization, high density and high reliability, more and more flux residues are generated in the electronic self-assembly process, and if the pollutants cannot be removed in time, the quality and the reliability of the product can be reduced along with the corrosion of the external environment. The flexible circuit board is a printed circuit made of flexible insulating base materials, has excellent electrical performance, can meet the design requirements of smaller and higher-density installation, and can generate a large amount of soldering flux residues in the self-assembly process; due to common circuit board material difference, an ultrasonic cleaning mode is preferably selected in the cleaning process, and residues of pollutants such as soldering flux and the like are removed by means of the synergistic effect of the ultrasonic and the cleaning agent.

The prior search patents are as follows: in the patent publication CN105331452A, it is mentioned that the components such as decahexafluoroheptane, nonafluorobutyl methyl ether, ethanol, alkane and fluorine-containing alcohol, dodecyl dimethyl amine oxide, modified coconut oil fatty acid diethanolamide, sodium xylene sulfonate, and trisodium nitrilotriacetate are used for removing the flux residue on the surface of the flexible circuit board, the formula combines with fluorine-containing solvent, alkane solvent and ionic surfactant, has quick volatilization and high efficiency for dissolving the flux residue, but the formula contains various alkanes and fluorine ethers, and generates great pungent smell; in addition, n-hexane in the formulation has a carcinogenic risk.

In the patent publication CN108207087A, phosphate ester salt, sulfate ester salt, zinc chloride, fatty alcohol-polyoxyethylene ether sodium sulfate, methyl benzotriazole, hydrochloric acid, EDTA, emulsifier, ionic surfactant, deionized water and other components are used to remove the flux residue on the surface of the flexible circuit board by ultrasonic method, and the flexible circuit board is cleaned by the cleaning agent after soaking in ethanol solution for ultrasonic treatment for 1-5 minutes; although the formula can clean the soldering flux, the formula is completely a surfactant and a chelating agent, so that the service life of the cleaning agent is greatly shortened, and the production efficiency is seriously influenced.

Disclosure of Invention

Aiming at the defects, the invention aims to provide a water-based flexible circuit board cleaning agent and a preparation method thereof, wherein the water-based flexible circuit board cleaning agent has an efficient cleaning effect, is excellent in compatibility, and is non-toxic and harmless to the atmospheric environment and human bodies.

The technical scheme of the invention is summarized as follows:

the water-based flexible circuit board cleaning agent comprises the following components:

preferably, the water-based flexible circuit board cleaning agent comprises an alcohol ether solvent, wherein the alcohol ether solvent comprises dipropylene glycol monomethyl ether, dipropylene glycol dimethyl ether and dipropylene glycol propyl ether.

Preferably, the water-based flexible circuit board cleaning agent further comprises one or more of dipropylene glycol butyl ether, ethylene glycol phenyl ether and propylene glycol phenyl ether.

Preferably, the water-based flexible circuit board cleaning agent is prepared from dipropylene glycol monomethyl ether, dipropylene glycol dimethyl ether, dipropylene glycol propyl ether, dipropylene glycol butyl ether, ethylene glycol phenyl ether and propylene glycol phenyl ether in a ratio of 1: 1-2: 0.5-1: 0-0.5: 0-0.2: 0-0.5.

Preferably, the water-based flexible circuit board cleaning agent is prepared by mixing a water-based flexible circuit board cleaning agent and an ionic surfactant, wherein the ionic surfactant is selected from two or three of sodium dodecyl sulfate, sodium dodecyl benzene sulfonate and hexadecyl sulfo phenoxy benzene sulfonate disodium salt; the weight ratio of the sodium dodecyl sulfate to the sodium dodecyl benzene sulfonate to the hexadecyl sulfo phenoxy benzene sulfonic acid disodium salt is 1: 0-0.5: 1-2.

Preferably, the water-based cleaning agent for the flexible circuit board is used, wherein the alcohol amine is one or more selected from 2-amino-2-methyl-1-propanol, monoisopropanolamine and N, N-dimethylcyclohexylamine, and the weight ratio of the 2-amino-2-methyl-1-propanol, monoisopropanolamine and N, N-dimethylcyclohexylamine is 1: 0-0.5: 0-0.2.

Preferably, the water-based flexible circuit board cleaning agent comprises an auxiliary agent comprising a corrosion inhibitor and a complexing agent, wherein the corrosion inhibitor is benzotriazole, and the complexing agent is sodium gluconate.

A preparation method of a water-based flexible circuit board cleaning agent comprises the following steps:

adding an alcohol ether solvent, tetrahydrofurfuryl alcohol and N-ethyl pyrrolidone into a reaction kettle at the rotating speed of 500r/m, and uniformly stirring; dissolving an appropriate amount of ionic surfactant in deionized water, mixing with the solution according to a certain proportion, stirring uniformly, finally adding auxiliaries such as benzotriazole and sodium gluconate, and stirring to obtain a clear and stable solution.

The invention has the beneficial effects that:

(1) the water-based flexible circuit board cleaning agent prepared by the invention is a weakly alkaline concentrated cleaning agent, does not contain any fluorocarbon solvent and halogenated hydrocarbon solvent in the formula, has low content of Volatile Organic Compounds (VOC), small smell and low toxicity, and is convenient to use and safe to operate; by the ultrasonic cleaning method, the cleaning efficiency of the flexible circuit board can be obviously improved, and the reliability is improved.

(2) The alcohol ether solvent contained in the water-based flexible circuit board cleaning agent prepared by the invention has a strong cleaning effect on activators such as organic acid in the soldering flux, N-ethyl-2-pyrrolidone and tetrahydrofurfuryl alcohol have excellent solubility on natural rosin and artificially synthesized rosin resin in the soldering flux, the alcohol amine solvent is added to perform a neutralization reaction with acid activators in the soldering flux, the corrosivity of residual organic acid pairs is effectively prevented, the ionic surfactant is added to help to dissolve residues of the soldering flux in an aqueous solution in the cleaning process and to help a rinsing process, and auxiliaries such as a corrosion inhibitor and a complexing agent are added to help to maintain high compatibility of a formula and improve cleaning power, so that the cleaning agent can achieve the best cleaning effect through the synergistic effect of all components.

(3) The water-based flexible circuit board cleaning agent prepared by the invention has a simple action mechanism, is diluted by deionized water to form a microemulsion phase, and has long service life and excellent cleaning power.

Detailed Description

The present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description.