JPS6015678B2 - Degreasing cleaner for metals and plastics - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a degreasing agent for cleaning metals, plastics, etc.

Degreasing and cleaning metal and plastic surfaces is essential as a pretreatment for plating, painting, etc., and its quality is an important factor governing the success or failure of desired plating or painting.

Alkaline degreasers not only saponify and neutralize free fatty acids and acidic components in dirt, but also improve the dispersibility of dirt in the degreasing solution, as well as the stability and wettability of the solution. It is the most common degreasing agent, and in addition to electrolytic degreasing, jet degreasing, and ultrasonic degreasing, the simpler bond degreasing method is also widely used. by the way,
As alkaline degreasing detergents, those using builders and chelating agents such as alkali, oxycarboxylic acid, and aminopolycarboxylic acid are already known, but for example, the one according to the Samurai Ko 51-Satoshi 24 invention is , does not substantially contain surfactant, and therefore has poor effect unless heated to a high temperature of 9.0 or higher.

Furthermore, the invention disclosed in Japanese Patent Publication No. 53-6093 requires the addition of a Q-substituted acetylene compound;
The invention of No.-100131 does not contain an alkali builder, and therefore does not have a practical cleaning effect on surfaces such as metals. Furthermore, Tokuseki Sho 53-16001
No. 1 discloses a cleaning agent for grills, grills, etc. consisting of caustic soda, sodium fatty acid hydroxycarboxylic acid or sodium aminocarboxylic acid, polyhydric alcohol, surfactant, and water. Since oxycarboxylic acid-based organic builder) and aminocarboxylic acid-based chelator are used alternatively, it is less effective as a cleaning agent for pre-plating treatment of metals and plastics.

The present invention overcomes the above-mentioned drawbacks of known metal and plastic cleaning agents, the gist of which is to contain alkali hydroxides or alkali metal carbonates, phosphates, silicates or fluorides as essential ingredients. 10 to 90 parts by weight of an inorganic alkali builder selected from acid salts (the same applies hereinafter)
, preferably 40 to 7, an oxycarboxylic acid organic builder selected from glyconic acid, citric acid, malic acid, tartaric acid, lactic acid or glycolic acid or salts thereof.
~ 6 holes, preferably 20 to 5 holes, nitrilotriacetic acid,
Ethylenediaminetetraacetic acid, ethylenetriaminepentaacetic acid, glycol etherdiaminetetraacetic acid or 1,2-
1 to 4 parts of an aminopolycarboxylic acid chelating agent selected from cyclohexanediaminetetraacetic acid or salts thereof;
Preferably 5 to 2 parts of the amphoteric surfactant and 1 to 2 parts of the base, preferably 2 to 1 part of the amphoteric surfactant (however, the total amount of each component above is 10
A degreasing agent for metals and plastics, characterized by containing the following:

The novel cleaning agent according to the present invention is particularly effective at temperatures of 50 to 70°C, but since it exhibits excellent degreasing and cleaning power even at lower temperatures, there is a risk that it may deform plastics, which have a relatively low softening point. Since there is no such thing, it is very useful in practice.

Inorganic pilders used in the composition of the present invention include, for example, sodium hydroxide or alkali metal carbonates, phosphates, silicates, borates, etc.; Examples of builders include gluconic acid, citric acid, malic acid, tartaric acid, lactic acid, glycolic acid or salts thereof, and examples of aminopolycarboxylic acid chelating agents include nitriloniacetic acid, ethylenediaminetetraacetic acid, and Chylene triamine pentaacetic acid, glycol ether diamine tetraacetic acid, 1/2
-Cyclohexanediaminetetraacetic acid or salts thereof are exemplified.

Finally, the amphoteric surfactant is preferably an alkylcarboxybetaine type, an alkylaminocarboxylic acid type, or an alkylimidazoline type composed of a saturated or unsaturated alkyl group having 8 to 22 carbon atoms. . The cleaning agent according to the present invention has an inorganic alkali builder of 10 to 9 units (hereinafter referred to as weight), preferably 40 to 7 units; an oxycarboxylic acid organic builder of 5 to 6 units, preferably 20 to 5 units. It is suitable to have a composition consisting of 1 to 4 parts, preferably 5 to 2 parts, of an aminobolycarboxylic acid xylate agent; and 1 to 2 parts, preferably 2 to 1 part, of both surfactants. However, if desired, it may also contain other anionic or nonionic surfactants. If any of the above four essential ingredients falls outside the recommended range, the cleaning effect will decrease.
In particular, if the amount of the amphoteric surfactant is less than 1 part, the cleaning effect at low temperatures will be reduced, and if it exceeds 2 parts, bubbles will tend to form, causing a practical problem. The cleaning agent of the present invention is most commonly used for counterfeit degreasing, but it can also be used for electrolytic degreasing, counterfeit degreasing, ultrasonic degreasing, and the like.

Hereinafter, various embodiments of the invention will be described using examples and comparative examples, but these are, of course, illustrative and are not intended to define the technical scope of the invention.

Example '11 Acid synthesis In accordance with the compositions shown in Table 1 below, samples of an inventive product and a comparative product were prepared.

Numbers in the table indicate parts by weight. Table 1 1) Nitrilotriacetic acid 2) Ethylenediaminetetraacetic acid '2l Test method Commercially available iron test piece for detergency test (JIS○3141/SP
CC-D) (150 leg (I) ) 9 Ikari Guo and soybean oil 1
A cleaning test was carried out under the cleaning conditions described in Section 3' below on the specimens left for 7 days after being immersed in a 100°C oil bath consisting of a mountain pass for 20 minutes, and the cleaning effect was evaluated based on the difference in weight between before and after. .

In addition, the amount of attached oil is within the range of approximately 500 to 1000. {3'Cleaning conditions Soaking temperature: 25DO, 600○ and 80℃ 3 stages Soaking time: 6 Sand Cleaning agent concentration: 30TA'SO'4} Evaluation Amount of attached oil before cleaning and residual oil after cleaning The detergency (%) is calculated from the amount according to the formula below.

Cleanability (%) = Amount of poison bow that is washed and worn x・〇. '
51 Results The test results are shown in Table 2 below.

Table 2 As shown in the above table, compositions A, B, and C according to the present invention exhibit excellent results of 97.9% or more regardless of the cleaning temperature.

In contrast, control v compositions D~1 lacking either an inorganic alkali builder, an oxycarboxylic acid organic builder, an aminocarboxylic acid chelating agent, or an amphoteric surfactant had 8
Even if high-temperature cleaning at 0°C is performed, it is not as good as low-temperature cleaning with the present sardine product, and although amphoteric surfactants can be substituted to some extent by anionic or nonionic surfactants, the effect is still greater than that of amphoteric surfactants. It is clear that the result is not as good as when using the same method (see date of composition, 1). As explained above and demonstrated through examples, the cleaning agent according to the present invention exhibits a strong cleaning effect even at low temperatures, and is therefore suitable for cleaning not only metals, but also Plata Stix before plating. It is also very good.

Claims (1)

[Scope of Claims] 1. 10 to 90 parts by weight of an inorganic alkali builder selected from alkali hydroxides or alkali metal carbonates, phosphates, silicates, or borates as an essential component.
), 5 to 60 parts of an oxycarboxylic acid organic builder selected from gluconic acid, citric acid, malic acid, tartaric acid, lactic acid or glycolic acid or salts thereof, nitrilotriacetic acid, ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid , 1 to 40 parts of an aminopolycarboxylic acid chelating agent selected from glycol etherdiaminetetraacetic acid, 1,2-cyclohexanediaminetetraacetic acid, or salts thereof, and 1 to 20 parts of an amphoteric surfactant (however, each component above (total amount of 100 parts)),
Degreasing detergent for plastics. 2. 40 to 70 parts by weight of an inorganic alkali builder selected from alkali hydroxide or alkali metal carbonate, phosphate, silicate, or borate as an essential component
20 to 50 parts of an oxycarboxylic acid organic builder selected from gluconic acid, citric acid, malic acid, tartaric acid, lactic acid or glycolic acid or salts thereof, nitrilotriacetic acid, ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid , 5 to 20 parts of an aminopolycarboxylic acid chelating agent selected from glycol etherdiaminetetraacetic acid, 1,2-cyclohexanediaminetetraacetic acid, or salts thereof, and 2 to 10 parts of an amphoteric surfactant (however, each component above The degreasing agent for metals and plastics according to claim 1, characterized in that it contains a total amount of 100 parts).