JPH11199897A - Detergent without requiring water rinse - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject detergent in a stable liquid state having the detergency comparable to that of a chlorine-based solvent and usable without requiring water rinse by including a specific dipropylene glycol monopropyl ether, methylmethoxybutanol and water therein. SOLUTION: This detergent is obtained by including (A) 15-70 pts.wt. dipropylene glycol mono-n-propyl ether and/or dipropylene glycol monoisopropyl ether, (B) 15-60 pts.wt. 3-methyl-3-methoxy-1-butanol and (C) 15-60 pts.wt. water. Furthermore, (D) preferably 0.1-5 pts.wt. hydrocarbon having 140-240 deg.C boiling point under 1 atm (e.g. nonane) is contained to thereby afford the detergency effective especially when an oil is mixed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning agent used for degreasing cleaning of metals, ceramics, glass, plastics and the like.

[0002]

2. Description of the Related Art Conventionally, as industrial degreasing detergents for metals, ceramics, glass, plastics, etc., aqueous detergents such as alkali detergents and non-flammable detergents such as 1,1,1-trichloroethane have been used. Chlorinated cleaning agents were used. Alkaline detergents include nonionic surfactants represented by polyoxyethylene alkylphenyl ether, surfactants such as anionic surfactants represented by sodium alkylbenzenesulfonate, sodium carbonate, sodium silicate, sodium borate, Alkali salts such as sodium phosphate, sodium hydroxide and potassium hydroxide, sodium tripolyphosphate, chelating agents such as ethylenediaminetetraacetate, nitrilotriacetate, gluconate, benzotriazole, amines, alkanolamines, sodium nitrite And the like are appropriately blended with a rust inhibitor.

[0003] The degreasing cleaning step using the aqueous cleaning agent is as follows.
Usually, it comprises a washing step, a rinsing step by washing with water, and a drying step by hot air or the like. On the other hand, chlorinated solvents such as 1,1,1-trichloroethane have excellent detergency and permeability,
Although it can be applied to all kinds of degreasing such as drawing oil and press oil, due to environmental problems such as air pollution and destruction of the ozone layer, the industry has replaced hydrocarbon-based cleaning agents and conventional water-based cleaning agents as alternatives. Is being applied.

[0004] However, there is a danger of explosion and fire due to ignition with hydrocarbon-based cleaning agents. Further, the conventional water-based cleaning agent usually requires a rinsing step by water washing after the washing step, and there is a problem that a large amount of wastewater is discharged from this step. For this reason, a method that unavoidably eliminates the water rinsing step has been tried, but the components of the cleaning agent remain on the surface of the article as residues, which become solid foreign matters and stains, and are painted, welded, and so on.
Since the problem of affecting the post-bonding process arises, it is possible only when the cleanliness is not required.

[0005] Therefore, there is a demand for a cleaning agent which has little residue even when used without water rinsing, hardly causes solid foreign matter and stains, and does not affect the subsequent steps. As such a cleaning agent, JP-A-8-3592 proposes a cleaning agent composed of two types of propylene glycol alkyl ethers and water. It does not have any adverse effects. But,
This detergent has poor permeability, is not suitable for removing oil in narrow gaps and holes, and may cause recontamination by separated oil.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a stable liquid excellent cleaning agent which has a detergency comparable to that of a chlorine-based solvent and can be used without the need for water rinsing. I do.

[0007]

The present inventors have conducted intensive studies and have found that dipropylene glycol mono-n-propyl ether and / or dipropylene glycol monoisopropyl ether, 3-methyl-3-methoxy-1-butanol, etc. It has been found that the above problem can be solved by combining the above, and the present invention has been completed.

That is, the present invention relates to (a) dipropylene glycol mono n-propyl ether and / or dipropylene glycol monoisopropyl ether 15 to 7
0 parts by weight, (b) 15-60 parts by weight of 3-methyl-3-methoxy-1-butanol, (c) 15-60 parts by weight of water, a water-rinse-free cleaning agent, and further,
(D) a hydrocarbon having a boiling point of 140 ° C. to 240 ° C. at 1 atm.
The present invention relates to a water-rinse-free cleaning agent containing 1 to 5 parts by weight.

Hereinafter, the present invention will be described in detail. The (a) dipropylene glycol mono-n-propyl ether and / or dipropylene glycol monoisopropyl ether used in the present invention dissolves a certain amount of oil, has excellent detergency, and has excellent permeability. Furthermore, since the residue after drying is evaporated away, no stain remains and no water rinsing is required, that is, it is optimal as a cleaning component of a non-rinse cleaning agent.

The content of dipropylene glycol mono n-propyl ether and / or dipropylene glycol monoisopropyl ether is preferably 15 to 70 parts by weight. If the amount is less than 15 parts by weight, the detergency is poor, and 70
When the amount is more than the weight part, the drying property is deteriorated, which is not preferable.
(B) 3-methyl-3-methoxy-1-butanol is
It is essential to compatibilize the above-mentioned dipropylene glycol mono-n-propyl ether and / or dipropylene glycol monoisopropyl ether with water while maintaining the detergency and to obtain a uniform detergent. As its content,
15 to 60 parts by weight are preferred. If the amount is less than 15 parts by weight, it becomes difficult to obtain a uniform composition.

The content of water (c) is preferably from 15 to 60 parts by weight. If the content is less than 15 parts by weight, a flash point tends to appear, and if it is more than 60 parts by weight, the detergency deteriorates, which is not preferable. The above combination alone has a sufficient detergency, but contains a hydrocarbon (d) having a boiling point of 140 ° C. to 240 ° C. at 1 atm.
In particular, a decrease in detergency when oil is mixed is suppressed. The content of the hydrocarbon is preferably 0.1 to 5 parts by weight. If the amount is less than 0.1 part by weight, the effect of addition is reduced,
When the amount is more than 5 parts by weight, the cleaning liquid tends to be difficult to be uniform.

Specific examples of the hydrocarbon include nonane, decane, undecane, dodecane, tridecane, 1-nonene,
1-decene and the like. In the present invention, a metal corrosion inhibitor such as benzotriazole and amine fatty acid salt, a metal ion sequestering agent, an antioxidant and the like can be appropriately blended and used. When the cleaning agent of the present invention is used in an actual cleaning step, it may be further diluted with water.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to examples. In addition, the test method, the measurement method, etc. are as follows. (1) Permeation degreasing test A 30-mesh stainless steel mesh (60 × 30 mm) was impregnated with metalworking oil (trade name: Unicut GH35, manufactured by Nippon Oil Co., Ltd.) and heated at 100 ° C. for 30 minutes. This was washed with a detergent, rinsed with water and dried, and the degreasing rate (%) was calculated from the amount of oil adhering before and after washing by the following formula.

Degreasing rate (%) = (oil content before washing−oil content after washing) × 100 ÷ oil content before washing (2) Stability test The detergent was kept at 30 ° C. and 50 ° C., and the effective component of the detergent was separated. , And observed for precipitation. (3) Evaporation residue test 1 g of the cleaning agent was placed in a crucible, and the weight after standing at 110 ° C. for 2 hours was measured to evaluate the residual weight ratio and the appearance of the residue.

(4) Finishing property test While the temperature of the cleaning agent was raised to 60 ° C, a stainless steel plate (5c
mx 5 cm) was immersed for 1 minute, pulled up, dried at 100 ° C, and the appearance of the stainless steel plate was evaluated. (5) Danger of ignition The flash point was measured by the Cleveland open method according to JIS-K-2265.

[0016]

Examples 1 to 5 and Comparative Examples 1 to 3 Tests and evaluations were performed on the cleaning agents prepared with the compositions shown in Table 1. Table 1 shows the results.

[0017]

[Table 1]

The numbers of each component in the table indicate parts by weight. The notes in the table are as follows. 1) When the degreasing rate is equivalent to degreasing with 1,1,1-trichloroethane; ○, inferior; x 2) When there is no change; ○, when precipitation and separation are observed;
× 3) The evaporation residue is liquid and the residual weight ratio is 0.1 wt% or less;
○, evaporation residue is solid or weight residual rate 0.1 wt%
× 4) No stain remains on test piece surface after drying; ○, stain remains; × 5) No flash point; ○, flash point present; ×

[0019]

The cleaning agent of the present invention has a detergency comparable to that of a chlorinated solvent and can be used without the need for water rinsing.
It is an excellent cleaning agent in stable liquid form.

Continued on the front page (51) Int.Cl. ⁶ Identification code FI C11D 7:26 7:24)

Claims (2)

[Claims] (A) dipropylene glycol mono-n-
15-70 parts by weight of propyl ether and / or dipropylene glycol monoisopropyl ether, (b) 3
A water-rinse-free cleaning agent containing 15 to 60 parts by weight of methyl-3-methoxy-1-butanol and (c) 15 to 60 parts by weight of water. 2. The method according to claim 1, further comprising: (d) a boiling point of 140 ° C. at 1 atm.
The water-rinse-free cleaning agent according to claim 1, comprising 0.1 to 5 parts by weight of a hydrocarbon at 240C.