JPH01128907A - Sanitizer - Google Patents

Abstract

PURPOSE: To obtain a sanitizer which causes no spot corrosion on stainless steel by using a caustic agent, a surfactant, a hypohalite bleaching agent and an alkali metal neutral silicate in a specific proportion and is added to a cleaning solution and is used for washing machines. CONSTITUTION: This sanitizer composition comprises at least 2wt.% of a caustic agent, 0-1wt.% of a surfactant, at least 3wt.% of a hypohalite bleaching agent and an alkali metal neutral silicate where the weight ratio of the silicate ion to the free halogen is at least 1:5 (preferably 1:5-1:1.5) and the weight ratio of the hypohalite bleaching agent to the other water-soluble electrolytes in the composition is at most 1:1 (preferably 1:2-1:1). A washing agent combined with this composition is used in a machine for washing large bulk articles or woven fabrics whereby the spot corrosion of stainless steel can be inhibited. This composition may contain additionally an alkali metal condensed phosphate builder.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an Ifli bovineizer (San!jiZ!n (l product)) containing a subhalogenate bleach.

J3 is used for washing large items (warewashina) or washing textiles.
[In order to achieve a functional level, use hypochlorite 1-1 genate bleach, considering the bleach-based l) 1j11 biogenic agent, in at least one or more washing cycles. Unfortunately, continued use will cause spot corrosion in certain parts of the stainless steel. If the machine is not working, especially the linear melter (sanitizcr 5olut)
ion) in spots near the spray nozzle.

It has been known in the past that agents such as sodium metasilicate have been used to remove the irritants, but as mentioned above, in order to effectively use the 4I-linitai There's a problem. First, all corrosion inhibitors in the IF UTO must be soluble f1 in aqueous liquids (the linitalyte must be added as a liquid). Second, the indefinite suspension of the inhibitor is
Linitai 1, which is completely devoid of any inhibitors.
Third, at effective levels of inhibitor, there is a real risk of bleach degradation. .

The present invention provides that r1 of at least 2 = l'lf1%
1 agent, 0-1% of surfactant f1 agent, at least 3 tons; d
% of hypochlorite II genate bleach and alkali gold 1+1 neutral silicate salt, the ratio of taic acid ion to free chlorine salt is at least 1:5, J, eel liquid No. 2 IJ'-composition (!
I discovered that these problems can be overcome and 1!7 can be achieved by writing the following notes.

Hypochlorite monogenate, e.g.
Number 1911'1ri1! The oxygen of l11 is released to form chloride, which exerts its sanitizing effect. Commercially available hypochlorite A salts actually contain traces of the corresponding chloride impurity. In the present invention (, ii@Riha): 1 Genpa, 110.1, 110.1, 110.1, 110.1, 110.1, 110.1, regardless of whether it is in the form of the corresponding 111i 11 Gen M salt, In the composition, the term "(") means "L1" in the composition.

The commercially available 411-salt cumulative salt compositions are characterized by their ability to utilize chlorine (=i &). The available chlorine is defined as the amount of chlorine liberated from the composition by adding at least 1 mole per M of brine.

In order to obtain the best corrosion inhibiting effect, the weight ratio of silicate ions to 1 free halogen is preferably 1:5 to 1:15.

To prevent the degradation of 11'Iv1 to bleaching, use the hypochlorite 1]genate whitening agent versus other water-soluble electrolytes in the composition.
It is most preferable that the ratio of (1) to (Eh) is 1:2 to 1:1.

hi b preferred hypochlorite bleach (
Aluminum metals are hypobasic M 1m, especially lithium salts.

Preferably, the composition further contains 1-5 to prevent calcium deposition on metal surfaces, particularly aluminum.
% of alkaline total condensed phosphate builders such as sodium tripolyphosphate or kareem.

For optimum bleach stability and effectiveness, the composition should also have a 011 content of at least 1912. 11 (preferably) with OC.

The IE agent in the composition is an alkali metal hydroxide or metasilicate such as sodium hydroxide.

1 cum of potassium hydroxide, sodium metasilicate or potassium metasilicate. Noritrium J in the whole composition
, and the relative barrier of potassium ions is 1 heribolyrin Ill! The salt precipitates in the form of a sodium salt precipitate and 4T
You should choose the right one.

The surfactant present at 0.1% by weight of the fabric is essentially an antifoaming agent.

The term ``alkaline neutral silicates'' means those in which the ratio of In silicate to alkali metal oxide is greater than 3:1. , a typical example is that SiO:NaO is 3.
Neutral sodium lyate and 11 in a 4:1 ratio. .

The invention will now be further explained by way of this example.

[1 Mouse Uni 1 5 (li [71% Potassium hydroxide 1 cum of potassium hydroxide t1 concentrated stock solution containing 6% by weight and 19.2% by weight 14% (i'ii n as available chlorine)] A two-handed composition was formulated using a 31.3% stock solution of sodium hypochlorite containing 1-lium hypochlorite.

C Examples 1 to 4 were formulated using a bleaching agent with low sodium chloride impurities, and Examples 5 and -E3 were formulated using a normal grade bleach and their respective NaCfJ-containing! In 21 metal-containing materials, 3 J3 and 5 heavy;

Sodium oxalate was added to active SiO:Na 0 (ratio +,
L3.4:1) was added as a 1-tox solution containing 34% by weight.

The solution was directly applied to a stainless steel disk and allowed to stand for 11 minutes and 46 hours so that corrosion was clearly visible.

The degree of corrosion was evaluated on a scale of 1 to 10. Here, 1 indicates no corrosion and 10 indicates severe corrosion.

Examples 9-12 Same as Examples 1-8, but using a stock solution containing additionally potassium tripolyphosphate, the following compositions were made into 1
! I built J. Potassium cum tripolyphosphate was added as a concentrated stock solution containing 50% suspension.

A clear solution was obtained without any precipitate formation.

Corrosion evaluation depends on the product of NaCβ impurities in the hypochlorite +J acid J-thorium solution used.Example 1-4
Ma7, ,: f,i It was the same as 6 of 5・-8.

Claims (7)

[Claims] (1) Contains at least 2% by weight caustic agent, 0-1% surfactant, and at least 3% by weight hypohalite bleach and alkali metal neutral silicate, silicate ions versus free halogens. and the weight ratio of hypohalite bleach to other water-soluble electrolytes in the composition is at most 1:1. (2) Weight ratio of silicate ion to free halogen is 1:5 or more
Claim 1 characterized in that the ratio is 1:1.5.
The composition described in Section. (3) Claims 1 or 2, characterized in that the weight ratio of the hypohalite bleach to other water-soluble electrolytes in the composition is from 1:2 to 1:1. Compositions as described. (4) The composition according to any one of claims 1 to 3, wherein the hypohalite bleach is an alkali metal hypochlorite. (5) The composition according to any one of claims 1 to 4, further comprising 1 to 5% of an alkali metal condensed phosphate builder. (6) The composition according to any one of claims 1 to 5, which has a pH of at least 12.0. (7) Claim No. 1 to the cleaning liquid in the article washing machine
7. A method for mechanically cleaning articles, which comprises adding the composition according to any one of items 1 to 6 in an amount that effectively sanitizes the composition.