JPS6055099A - Gypsum deterging 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 glazing product for cleaning plaster deposits, and in order to remove plaster deposits from objects,
The present invention relates to a composition having excellent performance.

Conventionally, ammonium citrate, hydrochloric acid, etc. have been used, but the cleaning time is long, and although the deposits can be removed by breaking down, it is impossible to completely dissolve them. This caused re-contamination of items to be cleaned, cleaning containers, and others.

The present invention is a composition characterized by containing as a component at least one type of polyaminocarboxylic acid compound or its salt and carbonate. Examples of the polyaminocarboxylic acid compounds used here include ethylenediaminetetraacetic acid (EDTA), hydroxyethylethylenediaminetriacetic acid (TEDTA), diethylenetriaminepentaacetic acid (DTPA), nitrilotriacetic acid (NTA), and various salts thereof (e.g. Na , to NH.

salt), and carbonates include Na2CO3 and K2CO3
, NaHCO3, KNHCO3, CaCOs, etc.

The mixing ratio of the two is preferably 1 to 1 (weight ratio) of the polyaminocarboxylic acid compound and 0.1 to 1 of the carbonate.
:0.2 to 0.6.

The polyaminocarboxylic acid compound is alkali (Na.

K, NH,) to adjust the pH so that when mixed and dissolved with carbonate, the pH will be 5 to 9, preferably pH 6 to 8.5. Preferable conditions can also be obtained by dissolving substances in water and adjusting the pH.

Methods of using the composition of the present invention (L2) include a method of dissolving it in water, adjusting the pH of the resulting aqueous solution, and immersing the object to be cleaned in it; and a method of cleaning by spraying the adjusted aqueous solution. and so on. Although the concentration is not particularly limited, it is practically used at 3 to 20%.

When cleaning with the composition of the present invention, vigorous foaming can be seen from the surface of the object to be cleaned.

This foaming helps break down the strongly adherent plaster. That is, since the surface area of the plaster increases, the dissolving action of the composition of the present invention increases, and it is believed that the dissolution of the plaster becomes faster. Don't worry, cleaning liquid p.
Since H maintains weak acidity or weak alkalinity both before and after treatment, it is extremely safe to operate, and the liquid after treatment is clear. By washing the object to be cleaned with water, the cleaning solution can be removed very easily, so there is no re-contamination, and this method is more effective than conventional methods.

Incidentally, the composition of the present invention may be used by appropriately adding additives such as ammonium citrate and ammonium tartrate.

Examples and Comparative Examples will be described below in order to specifically explain the present invention (herein, "part" means weight).

Example I HEDTA is dissolved in an aqueous NaOH solution to pH 5. To this, NaHCO30.5 is added to 1 part as HEDTA.
1.5% to make a 5% aqueous solution.

Examples 2-6, Comparative Examples 1-3 The following solutions were prepared in the same manner as in Example 1.

3 - How to make a test piece Apply approximately 0.1 g of gypsum per 10 cm to a commercially available frosted glass, dry, and cut into a size of 1 cII x 101 to make a test piece.

4- Test method: Pour the adjustment solutions of Examples and Comparative Examples into a glass container to a liquid height of 9c1M, leave it standing, put a test piece in it, and measure the time until the gypsum completely dissolves. This was taken as the dissolution time.

The results are summarized in the table below.

Patent Applicant Procedural Amendment (Spontaneous) 8th April 1988, Commissioner of the Japan Patent Office 1, Name of the invention Relationship to the case of the person making the amendment Patent Applicant Address 1-1 Kitahorie, Nishi-ku, Osaka No. 18 Procedural Amendment (Spontaneous) 1986/ρ Month] S Date, Director General of the Patent Office, Showa, f-, IP year patent application jI/ifri 3θ No. 2 Title of the invention 1 Relationship with the case of the person making the amendment Patent Applicant Address: 1-1-18 Kitahorie, Nishi-ku, Osaka-shi, 1-rin-N
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Claims (1)

[Claims] A plaster cleaning composition containing a polyaminocarboxylic acid or a salt thereof and a carbonate as main components.