JPS58152099A - Freely fluid alkali detergent - 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 is applicable to
It is sometimes called. ), and particularly relates to an alkaline cleaning agent having excellent fluidity and anti-blocking properties.

As is well known, alkaline cleaning agents are now widely used industrially as pre-treatment agents before subjecting metals, glass, plastics, etc. to surface treatments such as plating, painting, and coating. This alkaline cleaning agent generally includes inorganic builders such as sodium carbonate or sodium sulfate, oxyacid builders such as sodium citrate,
It contains auxiliary ingredients such as various chelate compounds and various surfactants, and especially in solid detergents, which make up the majority, the last surfactant is added to the powder or granular composition consisting of the other four components. It is often added using methods such as impregnation or coating.

By the way, with the drop in energy prices triggered by the oil shock of 1973, lowering of the cleaning temperature has been called for in the field of alkaline cleaning, and along with this, there is a strong desire for improvements in the alkaline cleaning agent itself. Became.

According to previous research, the most effective means to improve the low-temperature cleaning ability of this detergent is to increase the content of surfactant in the composition, but on the other hand, (1) manufacturing (II) Deterioration of product fluidity and blocking during storage of assembled products. Among these drawbacks, especially after These two drawbacks impede pipe transportation and accurate metering of the product, and are serious problems not only for manufacturers but also for users.The present invention solves the above-mentioned drawbacks of solid alkaline cleaning agents. Its important objective is to provide an ideal alkaline cleaning agent in this era of energy conservation.

According to the present invention, in addition to improving the fluidity of the product, blocking does not occur even when the product is stored for a long time, making pipe transportation and metering easier, and moreover, a larger amount of surfactant can be blended. Therefore, the quality of the product improves dramatically. Furthermore, it has great advantages in terms of process control, such as shortening the time required for manufacturing and drastically reducing the amount of products and raw materials that adhere to manufacturing equipment.

The gist of the present invention is that a silicon-containing inorganic powder is present in a solid alkaline detergent composition comprising an inorganic builder, an oxyacid building block, an aminocarboxylic acid chelating agent, and the like.

In the above, as the silicon-containing inorganic powder which is a characteristic component of the present invention, silicic acid or its salts such as anhydrous silicic acid, calcium silicate, aluminum silicate or magnenium silicate are used.
n~30μm, specific surface area 50~800rrl/? It is preferable to fall within the range of .

The blending ratio in the entire composition is suitably within the range of 0.2% (by weight, the same applies hereinafter) to 10%, preferably 0.5 to 5%. If it is less than 0.2%, sufficient improvements in unikinetic properties and anti-blocking properties cannot be expected, whereas if it exceeds 10%, the cleaning power will be reduced and these silicon-containing inorganic powders will be crushed in the cleaning solution, resulting in a decrease in the viscosity of the solution. Troubles such as rising or adhering to the inner walls of the cleaning tank, pipes, etc. are likely to occur.

The various components other than the above-mentioned silicon-containing inorganic powder may be the same as those of ordinary alkaline detergents, but it is desirable to contain at least an inorganic zeldar, an oxyacid bilter, an aminocarboxylic acid chelating agent, and a surface-fouling agent. As the inorganic builder, for example, alkali metal hydroxides such as sodium hydroxide or potassium hydroxide and/or alkali metal phosphates, silicates, carbonates, borates or sulfates are used. Ru. The total amount of these inorganic builders in the composition is i.

~90%, preferably 40-70%. In addition, oxy-acid organic builders include gluconic acid, citric acid, malic acid, tartaric acid, tartronic acid, glycuric acid, lactic acid, and β
- Oxypropionic acid etc. or salts thereof are exemplified,
The amount added is 5 to 60% in the composition, preferably 2 to 5%.
It is 0%.

Next, examples of aminocarboxylic acid chelating agents include nitrilotriacetic acid, ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid, glycol ether diaminetetraacetic acid, 1,2-cyclohexanediaminetetraacetic acid, or salts thereof, and the amount added is The amount is 1 to 40%, preferably 5 to 20%, based on the total composition.

Finally, as the surfactant, any of nonionic, anionic and cationic surfactants can be used, and preferred examples include polyoxyethylene alkyl ethers, polyoxy star tyrene alkylphenols, direct-quenching alkylbenzene sulfonic acids, Linear alkyl sulfonic acids, sulfosuccinic acid esters, or salts thereof, higher amine sulfonates, halokenated argylpyridinium or quaternary ammonium salts, or alkylimigzoline type, carboxybetaine type, sulfobetaine type, or aminosulfone Examples include acid type amphoteric surfactants. The amount of these surfactants added is usually 1 to 40%, preferably 2 to 10%.

The reason why the addition of the silicon inorganic powder according to the present invention significantly improves the fluidity and anti-blocking properties of the alkaline detergent to be blended has not yet been elucidated. However, it has been inferred from various preliminary experiments that silicon-containing inorganic powder has a large ability to absorb moisture in the atmosphere, and within the range of its equilibrium moisture content, it is possible to prevent local moisture imbalance in the product. It seems that the likely cause is that it acts as a buffer. The present inventor has discovered for the first time that a relatively small amount of silicon-containing inorganic powder in alkaline detergents has a great effect on improving fluidity and anti-blocking properties. It has remarkable value in industry and in cleaning agent applications.

The mode of carrying out the invention will be described below with reference to Examples, but the examples are merely for illustration purposes and are not intended to limit the scope or scope of the idea of the invention.

fi+ Preparation of detergent An alkaline detergent for testing was prepared according to the formulation shown in Table 1 below. A rotary granulator is used as a blending method, and this F
(1) A neutral inorganic builder, an oxyacid building block, and an aminocarboxylic acid chelating agent are first thoroughly mixed and granulated, and then (II) a surfactant is sprayed in the form of a concentrated solution. An alkaline inorganic builder was added and stirred to mix.The silicon-containing inorganic powder was blended in any of the steps (1) to (1) above.Finally, the product was passed through an automatic sieve to form a sieve with a diameter of about 3%φ. It was made into a granule product.

Table-l l) Wet method glue force, particle size 20pm, 55300m
'15'2) Particle size 3μIFIζ 5S150go/y3
) Dry process method, particle size 12% m, 55200 m'
/y4) Ethylenenoaminetetraacetic acid tetrasodium 5
) Trisodium Nitrilotriacetate (2) Blocking Resistance Test Adjusted Alkaline Cleaner 2 Kg 30 x 20c
After putting it in a plastic bag with the size of In, and sealing it, 252 per l.
After applying a load of 30°C and leaving it at 10°C and 30°C for 24 hours, the state of aggregation was observed. The evaluation criteria are as follows: ◎: Shows sufficient fluidity even after opening, and no blocking is observed.

O: Partial blocking is recognized, but the block is easily broken.

△: Blocking is recognized overall, but the block is easily broken.

×: Completely shows a block state and cannot be broken by hand.

(3) Liquidity test The inverted cone-shaped leak shown in Figure 1 (d1 = 180 fins).

d2=13m, a=21 (1m, b=35m)
Add 1 kg of alkaline cleaning agent (3 φ) to the tank and measure the time until it completely flows out. The evaluation criteria are as follows:
□ Outflow within 021 minutes 011 - Outflow in less than 3 minutes 61 Outflow in more than 3 minutes
Thoroughly degrease the area (width 100N x thickness 0.3m). Apply commercially available lithium grease to a degreased steel plate at 1002
It was applied uniformly at a ratio of 1. After being left for 24 hours, it was subjected to a cleaning test under the conditions described in 1.

Washing temperature: 60°C Washing time: 60 minutes Detergent concentration: 709/1 Washing method: After immersion washing, wash in running water at 40°C and 200 m/sec for 20 seconds, air dry for 15 seconds, and evaluate the cleaning performance based on the water-wet area. evaluated.

(5) Results Table 2 below shows the results of the blowing resistance test, fluidity test, and washability test for each sample in Table 1.

Table 2 (6) Discussion As shown in Table 2 above, it is clear that the compositions of the present invention (invention products 1 to 6) to which silicon-containing inorganic powder is added are superior in fluidity and blocking resistance. . That is, invention product 1 containing 2% silicon dioxide (N) and a comparative amount 1 that does not contain silicon dioxide, invention product 4 containing 2% silicon dioxide (B), and comparative amount 2 that does not contain silicon dioxide (B). Comparing Invention 6 containing 1% calcium silicate and 2% silicon dioxide with Comparative amount 3, there was no difference in cleaning performance, but blocking resistance and flowability were both significantly improved. In general, both of the above properties are almost inversely related to an increase in the amount of surfactant, that is, an increase in detergency, but even products with extremely excellent detergency, such as Inventions 5 and 6, have low blocking resistance. Both properties and fluidity are good.On the contrary, both properties of Comparative Amount 3, which corresponds to Invention Product 6, are extremely poor and cannot be used practically as a solid detergent.

It appears that it is sufficient for the amount of silicon-containing inorganic powder to be 0.5% or more in the composition (invention product 3).
% or less, there is no particular tendency to adversely affect the detergency, and as long as the amount of surfactant is 15% or less in the composition, the amount of powder added and the anti-sticking property and fluidity are similar. No correlation was observed between them.

[Brief explanation of the drawing]

FIG. 1 is a sketch of the leak used in the fluidity test of the example. 1st circle

Claims (1)

[Claims] +l) Free-flowing alkaline cleaning agent characterized by containing silicon-containing inorganic powder (2) Patent containing an inorganic builder, an oxyacid builder, an aminocarboxylic acid chelating agent, and a surfactant A cleaning agent according to claim (1). (3) Claim L, wherein the silicon-containing inorganic powder has a particle size of 5 nm to 30 pm and a specific surface area of 50 to 800 q.
+Cleaning agent described in item 1.