JPS6013725A - 1,1,1-trichloroethane composition - Google Patents

Abstract

PURPOSE:The titled composition useful as a de-fatting detergents for various kinds of metal parts, having improved long-term stability to various kinds of metals, obtained by blending 1,1,1-trichloroethane with specific five components such as 2-methyl-butanol, etc. in a specific ratio. CONSTITUTION:(A) 1,1,1-Trichloroethane is blended with (B) 2-methy-2-butanol, (C) 2-butanol, (D) nitromethane, (E) 1,2-butylene oxide, and (F) 2,6-di-t-butyl-p- cresol in such a way that (i) an amount of the components B+C is >=0.5wt% based on total amounts of the componets A-F, a ratio of the component B:C is (1:9)-(9:1), (ii) and an amount of the component D is <=4 times as much as the components B+C by weight, and an amount of the component E is <= twice as the components b+C, and (iii) total amounts of the components B-F is >=2wt% based on total amounts the components A-F, to give the titled composition even useful as a solvent for dry cleaning, etc., having long-term stability to various kinds of metals under severe conditions such as high-temerature steam cleaning with water, etc.

Description

[Detailed Description of the Invention] Related. For more details, see tl. 1-) 2-methyl-2-butanol, 2-butanol, ditromethane in lychloroethane. Stabilized 1,1,i- characterized by adding a combination of five components: 1.2-butylene oxide and 2,6-di-t-butyl-p-cresol.
) Lichloroethane composition.

'L'L1 F Lichloroethane has excellent dissolving power for various oils, is nonflammable, and is also less toxic to the human body than other chlorinated hydrocarbon solvents, so it is used as a degreaser and cleaner for various metal parts. Widely used as a dry cleaning agent and other industrial solvents.

However, unlike other chlorinated hydrocarbon solvents such as trichlorethylene or perchlorethylene, 1,1.1-)lichloroethane is
It has the disadvantage of being susceptible to decomposition reactions induced by various metals such as iron.

This decomposition reaction of 1.1.1-trichloroethane upon contact with metal is particularly remarkable in the case of aluminum; in the presence of aluminum, 1.1.1-) trichloroethane undergoes a chain reaction while generating hydrogen chloride even at room temperature. The decomposition progresses over time, and eventually the aluminum is severely corroded.
Turns into a blackish-brown tar-like substance. Therefore, 1,1.
1-) When using lychloroethane for degreasing and cleaning various metal parts, the metals may induce 1, 1.1
-) 1.1. To suppress the decomposition reaction of dichlorethane and prevent corrosion of the objects to be cleaned and the cleaning equipment. Stabilization of i-)lichloroethane is an essential requirement, and many stabilizers such as cyclic ether/l'Q, =) dil ml nitroalkanes, acetylenic alcohols, and epoxides have been proposed.

By the way, the decomposition reaction of 1,1,1-trichloroethane induced by metals differs depending on the type of metal, so it is difficult to stabilize all metals with a single stabilizer. It is customary to add a combination of two or more of these stabilizers to 1, 1.1-) dichloroethane used industrially for cleaning and the like.

However, i,1.1-)lichloroethane stabilized by the stabilizer formulations proposed so far,
This is not necessarily satisfactory under harsh conditions where various metal parts are used repeatedly at high temperatures, such as in steam degreasing and cleaning methods.

In other words, even if there is no problem during short-term use, during long-term use,
There is a drawback that the acid content generated in 1.1.1-trichloroethane gradually accumulates and corrodes the objects to be cleaned and the cleaning equipment. Furthermore, this 1.1.1-) deterioration of lychloroethane is
Corrosion is accelerated by the contamination of water, and corrosion often occurs in the objects to be cleaned and in the steam cleaner due to hot, humid summer weather or bringing in metal parts processed with water-soluble cutting oil.

The present inventors have demonstrated that 1,1.1-)lichloroethane is sufficiently stable against various metals such as aluminum, zinc, and iron, which are generally widely used as industrial materials, and is suitable for steam cleaning used at high temperatures. It is stable for a long time even under harsh conditions such as water contamination during the process.1.
1.1-) As a result of various studies regarding the trichloroethane composition, we found that 1,1゜1-trichloroethane, 2-methyl-2-butanol, 2-butanol, nitromethane, 1,2-butylene oxide and 2.6- G-t-
We discovered that a great synergistic effect can be obtained by adding the five components of butyl-p-cresol in combination,
The present invention has now been completed.

That is, the present invention provides (1) 1.1.1-trichloroethane with 2-methyl-
2-butanol, 2-butanol, nitromethane.

1,2-butylene oxide and 2,6-di-butyl-p-cresol 1) The total amount of 2-methyl-2-butanol and 2-butanol is α5% by weight or more of the content of all the above components, and both The ratio is 1:9 to 9:1 2) Nitromethane is 4 times or less by weight and 1,2-butylene oxide is 2 times or less by weight or less with respect to the total amount of 2-methyl-2-butanol and 2-butanol 3) and 2 -Methyl-2-butanol.

2-butanol, nitromethane, 1,2-butylene oxide and 2,6-di-t-butyl-p-cresol should be added in such a way that the total amount is 2% by weight or more based on the total amount of all the above components. Features stabilized i
, i, 1=deca-lichlorothane composition.

In the method of the invention, 2-methyl-2-butanol,
The addition range of the five components, 2-butanol, nitromethane, 1,2-butylene oxide, and 2,6-di-t-butyl-p-cresol, is 2-methyl-2-butanol and 2-butanol in a ratio of 1:9 to 9:1. The amount of nitromethane is not more than 4 times the total amount of 2-methyl-2-butanol and 2-butanol, and the amount of nitromethane is not more than 4 times the total amount of 1,2-butylene. Oxide: 2 times or less, 2.6-di-t-butyl-p-cresol: α11 times or less, 2-methyl-2-butanol, 2-
It is effective that the total amount of the five components, butanol, nitromethane, 1,2-pyrene oxide, and 2,6-di-t-butyl-p-cresol, is 2% by weight or more based on the total composition.

What should be noted in the present invention is that when the above-mentioned 1 to 4 components are added, no excellent stabilizing effect can be obtained, and that an excellent stabilizing effect can only be obtained by adding a combination of 5 components. It is in. In addition, in the present invention, 2
- A combination of methyl-2-butanol and alcohols other than 2-butanol, such as methanol, ethanol,
1-gropanol, 2-7' lovanol, 1-butanol.

2-methyl-propanol-'+ 3-buta/ -A/
.

Even if 5-methyl-1-butanol, 1-pentanol, etc. are used, almost no effect is obtained, and nitroalkanes other than nitromethane u, epoxides other than 1,2-butylene oxide fL2.6-di-t-butyl- Although some effects can be obtained by using phenols other than P-cresol, the excellent effects such as the combination of the five components of the present invention cannot be obtained.

The 1,1,1-trichloroethane composition of the present invention is sufficiently stable against various metals, is stable for a long period of time even at city temperature and in the presence of moisture, and is suitable for degreasing metal parts. Purposeful room temperature cleaning.

Suitable for use in heating cleaning, steam cleaning, etc.

It can also be used as a bath agent for dry cleaning and other industrial storage agents, and it is also possible to use other stabilizers in combination with the composition of the present invention.

Next, the present invention will be explained in detail with reference to examples, but the present invention is not limited to these examples. The stability evaluation was carried out using two different test methods.

Test-1〉 Sample 5o- and a surface-cleaned aluminum test piece (material: J-Tech SH4000,
A1100F, dimensions: 50imX50mmxljII+
) Place it in a cleaning dish (90Bφx20ms+) and scratch the surface of the aluminum piece with a knife.

Three scratches with a depth of approximately α11II+ were made at approximately equal intervals, and three more were made at right angles to this, and after 10 minutes had passed, the state of corrosion of the scratches on the aluminum piece was observed.

The criteria for judging scratches on aluminum pieces shall be marked as shown below.

◎...No change at all (＼.

O: Partially discolored.

Δ... Slight corrosion.

×: Significant corrosion.

<Test-2> Place 50 samples and pure water in a 100-glass Erlenmeyer flask.
Put 1L05Wt into the metal test piece (dimensions 2 13u + x 76m x 3) whose surface has been well polished and thoroughly washed and dried.
mm) One sheet is positioned so as to span both the gas and liquid phases. A reflux condenser is attached to the top of this Erlenmeyer flask, and the flask is heated to boiling temperature on a water bath, and the test piece is brought into contact with both gas and liquid phases while refluxing.

After boiling and refluxing for 150 hours, the sample was cooled to room temperature, a test piece was taken out, and its corrosion status and degree of coloration of the liquid phase were observed, and the generated hydrochloric acid content was determined by titration. In addition,
The materials of the metal test pieces used are as follows.

Aluminum piece...J Engineering S H4000A110OP
Zinc piece... J Engineering S H4321 Class 2 Iron Piece - J Engineering SG 4051820G In addition, the appearance of the metal test piece and the criteria for coloring the test solution are indicated as follows.

<Judgment criteria for metal test pieces> ◎...No change at all.

○... Some gloss is slightly reduced.

Δ...The overall gloss decreases.

X: Discoloration or corrosion is clearly observed throughout.

<Judgment criteria for coloring of test liquid> ◎・・・Colorless and transparent ○: Slightly colored.

Δ...Coloring is clearly observed.

X: Significantly colored.

1, 1.1-) Comparative Examples 1 to 1 regarding the results of evaluating the stability of lychloroethane using the above two test methods
The test compositions of Example 2 and Examples 1 to 8 are shown in Table 1, and the test results are shown in Table 2.

Claims (1)

[Claims] fll 1,1.1-) 2-methyl-
2-butanol, 2-butanol, nitromethane, 1.
11 2-butylene oxide and 2,6-di-t-butyl-p-cresol, the total amount of 2-methyl-2-butanol and 2-butanol is α5% by weight or more of the total amount of all the above components, and the ratio of both 1:9 to 9:1 2) Nitromethane is not more than 4 times the weight of 2-methyl-2-butanol and 2-butanol, and 1,2-butylene oxide is not more than 2 times the weight 3) and 2- Methyl-2-butanol. A stable method characterized by adding 2-butanol, nitromethane, 1,2-butylene oxide and λ6-di-t-butyl-p-gresol in an amount of 2 weight or more based on the total amount of all the above components. converted into 1
, 1.1-) Lichloroethane composition.