JPS5861198A - Chlorinated hydrocarbon mixed solvent composition - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a chlorinated hydrocarbon mixed solvent composition, and more particularly to a dichlorogloba/solvent mixed with a specific amount of methylene chloride.・Methylene chloride has traditionally been used as a solvent for metal cleaning and dry cleaning.

Chlorinated hydrocarbon solvents such as trichlorethylene, perchlorethylene or methylchloroform are widely used commercially. In recent years, with the development of the petrochemical industry, chlorine derivatives of propylene are being used in large quantities as C8 fractions, along with chlorine derivatives of ethylene. For example, this is the case when propylene oxide is produced from propylene by the chlorohydrin method. In such cases, it is known that a considerable amount of dichloropropane is obtained as a by-product, and there is a strong desire to develop uses for this by-product dichloropropane.

The present inventor has conducted various studies and studies in order to develop the use of dichloropropane as a cleaning solvent like conventional chlorinated solvents.

As a result, it was found that dichloropropane alone does not exhibit sufficient cleaning power as a cleaning solvent, and also poses problems of flammability, toxicity, and odor. Therefore, as a result of further investigation in order to resolve these drawbacks, we discovered the following new matter. In other words, by adding and mixing more than a certain amount of methylene chloride to dichloropropane, cleaning power can be significantly improved compared to using dichloropropane alone, and there is no risk of ignition, and toxicity and odor are also improved. It has been discovered that the solvent can be used commercially.

In this way, the present invention was completed based on the recognition of the above-mentioned problems and the discovery of new and novel facts.
A novel chlorinated hydrocarbon mixed solvent consisting of dichloropropane and methylene chloride is provided.

The mixed solvent of the present invention can be used commercially by usually adding 0.3 parts by weight or more of methylene chloride to 1 part by weight of dichloropropane, preferably adding and mixing 0.4 parts by weight or more of U. be satisfied with. For example, 70% dichloropropane in a mixed solvent.
weight%.

In a composition containing 30% by weight of ``methylene chloride'', there is no flash point, the value of kauributanol, which is a measure of detergency, is higher than that of perchlorethylene, and the allowable concentration can be improved to the same level as methyl chloroform. Dichloropropane, d, 1,2-dichloropropane, ll3-dichloropropane.

There are 1,1-dichloropropane and 2,2-dichloropropane, both of which can be used.

In addition, especially when used for degreasing and cleaning metals in which a gas-liquid phase coexists, it is desirable to contain a stabilizer capable of suppressing decomposition of the solvent. As such stabilizers, those conventionally known as stabilizers for chlorinated hydrocarbon solvents such as methylene chloride and perchloroethylene can be used as appropriate. For example, alcohols, epoxides, nitroalkanes, ethers, phenols or amines. Furthermore, in the mixed solvent of the present invention, in addition to dichloropropane and methylene chloride, other solvents and various additives may be added and mixed in addition to the above-mentioned stabilizers within a range that does not impede the purpose of the present invention. Of course, there is no difference.

The mixed solvent of the present invention can be used as a cleaning solvent for general machinery and metals, a paint stripper, and other general industrial solvents. Especially in usage situations where there is a risk of explosion or fire due to ignition.
Or semi-closed.

The mixed solvent of the present invention is advantageous in oven-type usage where the effects of toxicity cannot be ignored.

Next, examples of the present invention will be specifically described, but it goes without saying that the present invention is not limited by such description. In addition, in the following examples, the measurement of the caulibutanol value in Table 1 was performed according to ASTM: D 1133-61 using a method using toluene as the standard.
Further, the flash point was measured using a K 2265 Benski-Martens type (closed type) flash point measuring device. The stability test in Table 2 was conducted based on EIK 1508, in which sample 20 was placed in an Erlenmeyer flask equipped with a reflux condenser and an oxygen inlet tube.
0-, one well-polished mild steel piece was suspended in the sample solution, and the other 8 pieces were suspended in steam 3 m above the liquid level, and oxygen gas saturated with moisture was added. Blow through a glass tube with an internal diameter of 3M at a rate of 10-15 bubbles per minute. After the Q test in which the flask was heated with a 150W light bulb and heated under reflux for 48 hours, the sample was cooled to room temperature and the 40F
After adding neutral distilled water 409 to it and stirring vigorously for 3 minutes, the pH of the aqueous layer 4Of' was measured. Further, the solution was subjected to neutralization titration with N/'100 NaO1 (or N/100 HCI) to measure acidity or alkalinity.

Claims (1)

[Scope of Claims] 1) A chlorinated hydrocarbon mixed solvent composition comprising dichloropropane and methylene chloride. 2) The mixed solvent composition according to claim 1, comprising 0.3 parts by weight or more of methylene chloride per 1 part by weight of dichloropropane.