Composite hydrocarbon cleaning agent and preparation method thereof

Abstract

The invention belongs to the technical field of cleaning agents, and particularly relates to a composite hydrocarbon cleaning agent and a preparation method thereof. The cleaning agent comprises hydrocarbon, an alcohol ether solvent, an alkylamine compound, polyfatty acid, sodium glycocholate and water. The composite hydrocarbon cleaning agent can achieve oil stain dissolution and scaling powder removal at the same time, and the industrial cleaning efficiency can be improved.

Description

Technical Field

[0001] This invention belongs to the field of cleaning agent technology, specifically relating to a composite hydrocarbon cleaning agent and its preparation method. Background Technology

[0002] Industrial cleaning agents primarily rely on benzene-based solvents and halogenated hydrocarbon solvents. However, these solvents are highly volatile and toxic, and their effectiveness in removing flux is limited. Hydrocarbon cleaning agents (such as isoalkanes and n-alkanes) are gradually becoming alternatives to benzene-based solvents due to their low toxicity and low volatility. However, existing hydrocarbon cleaning agents have the following problems: 1. Hydrocarbons are highly hydrophobic, making it difficult to dissolve flux components containing polar groups; 2. Some hydrocarbon cleaning agents improve emulsification by adding nonionic surfactants (such as Tween and Span series), but this still cannot avoid the risk of environmental accumulation.

[0003] With the continuous development of industrial manufacturing technology, the requirements for cleaning agents are becoming increasingly stringent. Especially in the electronics manufacturing field, the miniaturization and precision trends of components pose greater challenges to cleaning work. There is an urgent need for a cleaning agent that meets the requirements of multifunctionality, environmental friendliness, and high efficiency. CN109762679A provides an environmentally friendly high-purity hydrocarbon cleaning agent and its preparation method. This cleaning agent has a high decontamination rate, low odor, minimal residue, and low volatility. Combined with a vacuum recovery rate of over 85%, it is suitable for demanding cleaning tasks and provides superior durability and environmental performance. However, this cleaning agent does not address the removal of flux and fails to effectively solve the problem of simultaneously removing oil and flux.

[0004] Therefore, there is an urgent need to develop a composite hydrocarbon cleaning agent that can effectively remove both oil and flux, thereby reducing the number of cleaning steps required. Summary of the Invention

[0005] The first aspect of the present invention provides a composite hydrocarbon cleaning agent, which comprises: a hydrocarbon compound, an alcohol ether solvent, an alkylamine compound, a polyfatty acid, sodium glycocholate, and water.

[0006] The composite hydrocarbon cleaning agent of this invention can remove oil stains and has excellent removal rates for flux and other components without using benzene-based solvents and traditional surfactants. This is presumably because hydrocarbons can provide a hydrophobic environment, sodium glycocholate emulsifies hydrocarbons in the presence of water, and the protonation of alkylamine compounds can form primary aggregates with sodium glycocholate through electrostatic interactions, increasing the stability of micelles and allowing oil stains to be better dissolved and removed by the system. In addition, polyfatty acids can provide more -COO⁻ sites, which together with sodium glycocholate enhance the metal binding ability, and the complexed metal ions achieve phase separation through the micelle interface.

[0007] As a preferred embodiment of the present invention, the mass of the alcohol ether solvent is 5-20% of the mass of the hydrocarbon, preferably 8-15%.

[0008] As a preferred embodiment of the present invention, the mass of the alkylamine compound is 1-10% of the mass of the hydrocarbon compound, preferably 5-8%.

[0009] As a preferred embodiment of the present invention, the mass of the polyfatty acid is 1-10% of the mass of the hydrocarbon compound, preferably 5-8%.

[0010] As a preferred embodiment of the present invention, the mass ratio of sodium glycocholate to alkylamine compound is (1-5):1, for example 1:1, 1.5:1, 2:1, 2.5:1, 3:1, 3.5:1, 4:1, 4.5:1 or 5:1, preferably (1.5-2):1.

[0011] As a preferred embodiment of the present invention, the mass of the water is 10-30% of the mass of the hydrocarbons, preferably 12-18%.

[0012] The present invention has found that controlling the ratio of sodium glycocholate to alkylamine compounds within the above-mentioned range can better enhance the cleaning agent's effect on removing oil and flux. It is speculated that controlling the ratio of sodium glycocholate to alkylamine compounds within the above-mentioned range can better enhance the stability of micelles.

[0013] In this invention, hydrocarbons refer to compounds composed of carbon and hydrogen. As a preferred embodiment of this invention, the hydrocarbons are selected from C10-C18 isoalkanes, such as 2-methylnonane, 2,2-dimethyloctane, 2,2,4-trimethylnonane, 4-methyltridecane, 7-methylpentadecane, 3-methylheptadecane, etc.; preferably, the hydrocarbons are selected from C10-C13 isoalkanes.

[0014] In this invention, alcohol ether solvents are a class of compounds that simultaneously contain hydroxyl groups and ether bonds. As a preferred technical solution of this invention, the alcohol ether solvent is selected from at least one of ethylene glycol butyl ether, diethylene glycol methyl ether, dipropylene glycol methyl ether and tripropylene glycol methyl ether, preferably diethylene glycol methyl ether and / or dipropylene glycol methyl ether.

[0015] In this invention, alkylamine compounds refer to compounds containing alkyl and amino groups. As a preferred technical solution of this invention, the alkylamine compounds are selected from at least one of triethylamine, n-butylamine, tetrapropylammonium hydroxide, tetrapropylammonium bromide, and tetraethylammonium hydroxide.

[0016] As a more preferred technical solution of the present invention, the alkylamine compound is a combination of n-butylamine and tetrapropylammonium bromide, preferably the mass ratio of n-butylamine to tetrapropylammonium bromide is 1:(1.5-3), more preferably 1:(1.8-2.5).

[0017] In this invention, polyfatty acids are a class of compounds formed by the polymerization reaction of fatty acids. They typically have multiple carboxylic acid groups or repeating fatty chain structures, and can be dimers and / or trimers. As a preferred embodiment of this invention, the fatty acid is selected from dimer fatty acids, more preferably dimer linoleic acid and / or dimer oleic acid.

[0018] The second aspect of the present invention provides a method for preparing the composite hydrocarbon cleaning agent described in the first aspect of the present invention. The preparation method includes: first mixing an alcohol ether solvent, an alkylamine compound, a polyfatty acid, sodium glycocholate, and water, and then adding a hydrocarbon compound for a second mixing.

[0019] The specific methods of the first mixing and the second mixing in this invention are not particularly limited, as long as the corresponding materials can be mixed evenly.

[0020] As a preferred technical solution of the present invention, the conditions for the first mixing and the second mixing each independently include: a temperature of 50-60°C and a time of 30-100 min.

[0021] Compared with the prior art, the present invention has at least the following beneficial effects:

[0022] 1. The composite hydrocarbon cleaning agent of the present invention does not contain benzene-based solvents and traditional surfactants, and has excellent environmental protection properties.

[0023] 2. The composite hydrocarbon cleaning agent in this invention can simultaneously dissolve oil stains and remove flux, thereby improving industrial cleaning efficiency.

[0024] 3. The composite hydrocarbon cleaning agent in this invention not only ensures the cleaning effect, but also meets increasingly stringent environmental regulations. Detailed Implementation

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Example 1

[0027] 1.3 kg of diethylene glycol methyl ether, 0.2 kg of n-butylamine, 0.4 kg of tetrapropylammonium bromide, 0.7 kg of dilinoleic acid, 1 kg of sodium glycocholate, and 1.5 kg of water were mixed at 50°C for 60 min. Then, 10 kg of 2,2,4-trimethylnonane was added and mixed at 50°C for 40 min to obtain a composite cleaning agent.

[0028] Example 2

[0029] 1.2 kg of dipropylene glycol methyl ether, 0.25 kg of n-butylamine, 0.55 kg of tetrapropylammonium bromide, 0.5 kg of dilinoleic acid, 1.5 kg of sodium glycocholate, and 1.8 kg of water were mixed at 50°C for 60 min. Then, 10 kg of 2,2,4-trimethylnonane was added and mixed at 50°C for 40 min to obtain a composite cleaning agent.

[0030] Example 3

[0031] 1.5 kg of diethylene glycol methyl ether, 0.18 kg of n-butylamine, 0.42 kg of tetrapropylammonium bromide, 0.8 kg of dimeroleic acid, 1 kg of sodium glycocholate, and 1.6 kg of water were mixed at 50°C for 60 min. Then, 10 kg of 2,2,4-trimethylnonane was added and mixed at 50°C for 40 min to obtain a composite cleaning agent.

[0032] Example 4

[0033] 1.3 kg of diethylene glycol methyl ether, 0.3 kg of n-butylamine, 0.6 kg of tetrapropylammonium bromide, 0.7 kg of dilinoleic acid, 0.5 kg of sodium glycocholate, and 1.5 kg of water were mixed at 50°C for 60 min. Then, 10 kg of 2,2,4-trimethylnonane was added and mixed at 50°C for 40 min to obtain a composite cleaning agent.

[0034] Example 5

[0035] 1.3 kg of diethylene glycol methyl ether, 0.1 kg of n-butylamine, 0.2 kg of tetrapropylammonium bromide, 0.7 kg of dilinoleic acid, 1.3 kg of sodium glycocholate, and 1.5 kg of water were mixed at 50°C for 60 min. Then, 10 kg of 2,2,4-trimethylnonane was added and mixed at 50°C for 40 min to obtain a composite cleaning agent.

[0036] Example 6

[0037] 1.3 kg of diethylene glycol methyl ether, 0.6 kg of n-butylamine, 0.7 kg of di-linoleic acid, 1 kg of sodium glycocholate, and 1.5 kg of water were mixed at 50°C for 60 min. Then, 10 kg of 2,2,4-trimethylnonane was added and mixed at 50°C for 40 min to obtain a composite cleaning agent.

[0038] Example 7

[0039] 1.3 kg of diethylene glycol methyl ether, 0.6 kg of tetrapropylammonium bromide, 0.7 kg of di-linoleic acid, 1 kg of sodium glycocholate, and 1.5 kg of water were mixed at 50°C for 60 min. Then, 10 kg of 2,2,4-trimethylnonane was added and mixed at 50°C for 40 min to obtain a composite cleaning agent.

[0040] Comparative Example 1

[0041] 1.3 kg of diethylene glycol methyl ether, 0.2 kg of n-butylamine, 0.4 kg of tetrapropylammonium bromide, 0.7 kg of di-linoleic acid, 1 kg of Span-80, and 1.5 kg of water were mixed at 50°C for 60 min. Then, 10 kg of 2,2,4-trimethylnonane was added and mixed at 50°C for 40 min to obtain a composite cleaning agent.

[0042] Comparative Example 2

[0043] 1.3 kg of diethylene glycol methyl ether, 0.2 kg of n-butylamine, 0.4 kg of tetrapropylammonium bromide, 0.7 kg of linoleic acid, 1 kg of sodium glycocholate, and 1.5 kg of water were mixed at 50°C for 60 min. Then, 10 kg of 2,2,4-trimethylnonane was added and mixed at 50°C for 40 min to obtain a composite cleaning agent.

[0044] Performance testing

[0045] 1. Solder paste cleaning effect test: PCB boards soldered with the same specification of solder paste were spray-cleaned and dried using the cleaning agents of the examples and comparative examples, respectively. The cleanliness of the PCB board surface after cleaning was observed using an electron microscope. The evaluation criteria are as follows:

[0046] Level 1: No microparticles or solder paste residue on the PCB board surface;

[0047] Level 2: The PCB board surface contains a small amount of particles and / or a small amount of solder paste residue;

[0048] Level 3: Obvious particles and / or obvious solder paste residue on the PCB board surface.

[0049] 2. Oil stain cleaning effect test: The copper sheet was placed in anhydrous ethanol and ultrasonically cleaned and dried. Then, the oil stain was manually spread evenly on the surface of the copper sheet. After drying, its weight was recorded as M1. The cleaning agent was poured into the ultrasonic cleaner and heated to 45℃. The copper sheet with oil stains was then immersed in it for cleaning (ultrasonic frequency of 30KHz, ultrasonic for 5 minutes). After taking it out, wiping it, and drying it with hot air, its weight was recorded as M2. Oil stain removal rate = (M1-M2) / M1*100%.

[0050] The test results are shown in Table 1.

[0051] Table 1. Test results of the cleaning effect of the cleaning agent on solder paste and dirt removal.

[0052] Solder paste cleaning effect Oil removal rate Example 1 Level 1 99.82% Example 2 Level 1 99.64% Example 3 Level 1 99.75% Example 4 Level 1 94.44% Example 5 Level 1 95.37% Example 6 Level 2 97.66% Example 7 Level 2 96.56% Comparative Example 1 Level 3 93.28% Comparative Example 2 Level 3 91.3%

[0053] As can be seen from the test results in Table 1, the components of the composite hydrocarbon cleaning agent of the present invention work synergistically to simultaneously dissolve oil stains and remove flux.

[0054] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A composite hydrocarbon cleaning agent, characterized in that, The cleaning agent comprises: hydrocarbons, alcohol ether solvents, alkylamine compounds, polyfatty acids, sodium glycocholate, and water.

2. The composite hydrocarbon cleaning agent according to claim 1, characterized in that, The mass of the alcohol ether solvent is 5-20% of the mass of the hydrocarbon; the mass of the alkylamine compound is 1-10% of the mass of the hydrocarbon; the mass of the polyfatty acid is 1-10% of the mass of the hydrocarbon; the mass ratio of sodium glycocholate to alkylamine compound is (1-5):1; and the mass of water is 10-30% of the mass of the hydrocarbon.

3. The composite hydrocarbon cleaning agent according to claim 2, characterized in that, The mass of the alkylamine compound is 5-8% of the mass of the hydrocarbon compound; the mass ratio of sodium glycocholate to the alkylamine compound is (1.5-2):

1.

4. The composite hydrocarbon cleaning agent according to claim 1, characterized in that, The hydrocarbons are selected from C10-C18 isoalkanes.

5. The composite hydrocarbon cleaning agent according to claim 4, characterized in that, The hydrocarbons are selected from C10-C13 isoalkanes.

6. The composite hydrocarbon cleaning agent according to claim 1, characterized in that, The alcohol ether solvent is selected from at least one of ethylene glycol butyl ether, diethylene glycol methyl ether, dipropylene glycol methyl ether, and tripropylene glycol methyl ether.

7. The composite hydrocarbon cleaning agent according to claim 1, characterized in that, The alkylamine compound is selected from at least one of triethylamine, n-butylamine, tetrapropylammonium hydroxide, tetrapropylammonium bromide, and tetraethylammonium hydroxide.

8. The composite hydrocarbon cleaning agent according to claim 1, characterized in that, The fatty acid is selected from dimer fatty acids.

9. A method for preparing the composite hydrocarbon cleaning agent according to any one of claims 1-8, characterized in that, The preparation method includes: first mixing alcohol ether solvent, alkylamine compound, polyfatty acid, sodium glycocholate and water, and then adding hydrocarbon compound for second mixing.

10. The preparation method according to claim 9, characterized in that, The conditions for the first mixing and the second mixing each independently include: a temperature of 50-60°C and a time of 30-100 min.