LU85433A1 - DETERGENT COMPOSITIONS CONTAINING A CHLOROISOCYANURIC DERIVATIVE SUITABLE FOR WASHING DISHWASHER IN A WASHING MACHINE AND THEIR PREPARATION METHOD - Google Patents

Description

1.

The present invention relates to new detergent compositions suitable for washing dishes in a washing machine, and their preparation process.

Machine dishwashing involves both the detergent action and the mechanical action of water.

Apart from its detergent action, the detergent must also have disinfecting power and softening properties of water. It is therefore necessary that the detergent has a strong detergency, but also a composition such that it does not cause the formation of foams which are detrimental to the mechanical action of water. This is why the detergent compositions consist in known manner: of a softening agent generally chosen from the class of polyphosphates. (Among the polyphosphates used, there may be mentioned sodium tripolyphosphate, sodium hexametaphosphate, pyrophos - 15 sodium phate, as well as the corresponding potassium polyphosphates) - an alkalizing agent which consists mainly of sodium meta-silicate, either in its anhydrous form or in its penta-hydrated form ( known, sodium silicate can be partially replaced by sodium carbonate, sodium sulfate or soda).

- a non-foaming surfactant of the nonionic type, chosen from the following classes of products: linear ethoxylated alcohols, ethylene oxide condensate on propylene oxide, oxyalkylamines, polyethoxyethers of fatty alcohols, ethoxylated alkyl phenols or phosphoric esters of fatty alcohols (Preferably, for reasons of efficiency, biodegradability and cost, a surfactant is chosen "from the class of linear ethoxylated alcohols).

- and a disinfection agent.

** The disinfecting agent used which releases active chlorine is generally a solid chlorinated product of the chloroisocyanuric derivative type.

It is most often a sodium or potassium salt of dichlo-roisocyanuric acid. Until now, an anhydrous sodium dichloroisocyanurate titrating 63% of active chlorine has been used in practice, or a sodium dichloroisocyanurate dihydrate titrating 56% of active chlorine, or an anhydrous potassium dichloroisocyanurate titrating 59 Z of chlorine active, L— 2.

• either a potassium dichloroisocyanurate monohydrate titrating 56 Z of active chlorine, or a calcium dichloroisocyanurate tetrahydrate titrating 56 Z of active chlorine. Active chlorine is defined as the oxidizing power due to positive chlorine. To better understand what 5 corresponds to positive chlorine, it should be remembered that the chlorine present in the chlorinated derivatives described above is fixed on the nitrogen atom and is there in the form of the degree of oxidation + 1 , i.e. C1 +.

During the oxidation-reduction process, a Cl + ion combines with two electrons to pass to the Cl (chloride) stage. Two - 10 equivalents of oxidant are released: which correspond to 71 g of elemental chlorine, although the atomic mass is only 35.5. This also means that an atom of Cl has the same oxidizing power as a molecule of elementary chlorine C ^.

Among the other chlorinated disinfectants of the family of 15 chloroisocyanurics, there is one which titers nearly 91% of active chlorine: trichloroisocyanuric acid. It would therefore be advantageous to be able to use it, given its high percentage of active chlorine.

"Unfortunately, hitherto its use has not been possible since it exhibits too great a reactivity with respect to the other constituents of the detergent compositions, in particular with regard to surfactants. Detergents containing trichloroisocyanuric acid are unstable on storage and lose both significant amounts of chlorine and surfactants by mutual destruction.

We have now found a way to stabilize trichloroisocyanuric acid, in particular to stabilize it for the manufacture of storage stable laundry compositions suitable for washing dishes in washing machines.

30 . The present invention relates to a new stable n detergent composition suitable for washing dishes in a washing machine, i containing a softening agent chosen from polyphosphates, an alkalizing agent chosen from sodium silicates, a nonionic surfactant , a chloroisocyanuric derivative characterized in that the chloroisocyanuric derivative used is trichloroisocyanuric acid coated with a paraffin wax used in an amount of 1 to 10% by weight relative to the weight of the acid.

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Paraffin waxes have been found to be compatible with trichloroisocyanuric acid. In addition, they make it possible to obtain, by implementing relatively low doses, good stabilization of the acid. Furthermore, they are dispersible under the washing conditions, that is to say in aqueous media having a temperature of 50 to 60 6 C.

Paraffin waxes consist of a mixture of high molecular weight solid hydrocarbons (for example C ^ H ^), which have a melting point below 60D C and above 40 ° C, a viscosity at 100 ° C less than 6 centipoise. They are used in an amount of 1 to 10% by weight relative to the trichloroisocyanuric acid and preferably in an amount of 3 to 5% by weight. Above 5%, difficulties appear during the coating and it is necessary to adjust the conditions to obtain a suitable coating. The use of quantities greater than 10 X does not bring a significant improvement in stability when storing laundry compositions. The use of quantities lower than 1 X leads to too weak stabilization of the acid.

The laundry compositions which are the subject of the invention are produced by first coating the trichloroisocyanuric acid with paraffin waxes. This coating is carried out in any industrial mixer, such as a drum mixer, preferably a mixer provided with a heating device. It is also possible to use a rotary mixer of the concrete mixer type in which the molten wax is sprayed onto the heated acid at a temperature in the region of 50 ° C. The processing temperature allows a good distribution of the paraffin waxes which solidify on cooling.

The wax-coated trichloroisocyanuric acid is then mixed in another mixer with the other constituents of the detergent.

The amounts of the various constituents other than paraffin used for the manufacture of the new detergent compositions which are the subject of the invention are used in conventional weight ratios. The softening agent chosen from polyphosphates is used in an amount of 25 to 60% by weight and preferably from 40 to 50% by weight relative to the weight of the composition.

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ί The basifying agent chosen from sodium silicates is used at a rate of 30 to 70% by weight and preferably from 40 to 40%. 60 X in.weight in relation to the weight of the composition. In known manner, the sodium silicate can be partially replaced by sodium carbonate, sodium sulfate or soda. The nonionic tension-active agent is used in an amount of 0.5 to 4% by weight and preferably in an amount of 1 to 3% by weight relative to the weight of the composition. The trichloroisocyanuric acid coated with paraffin waxes is used in an amount of 0.5 to 5% by weight and preferably 1 to 3% by weight relative to the weight of the composition.

The following examples illustrate the present invention.

EXAMPLE 1.

Trichloroisocyanuric acid is stabilized beforehand with the aid of paraffin waxes as follows: The acid is heated to a temperature of 50 ° C. and then placed in a pan. During the rotation of the bezel, paraffin wax is sprayed on it with a gun. The processing temperature i allows a good distribution of the waxes which solidify on cooling. The paraffin waxes used have a melting point below 20 to 60 ° C and a viscosity at 100 ° C below 6 centistokes. Various mixtures of acid and waxes are produced using variable percentages of paraffin waxes. The mixtures thus obtained are used for the manufacture of laundry compositions.

Detergents are prepared · having the following composition (parts 25 are expressed in parts by weight), - sodium tripolyphosphate: 50 parts „. - sodium metasilicate (anhydrous or hydrated 5 H ^ O): 50 parts - PLURAFAC EA 43 (ethoxylated nonionic surfactant manufactured by the company PCUK): 2 parts 30 - trichloroisocyanuric acid coated with paraffin waxes: „2 parts.

First, the premix of sodium tripolyphosphate t and of nonionic surfactant is produced in a rotary type mixer.

After 20 minutes, a homogeneous mixture is obtained. The metasilicate is then added to the mixer.

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5.

After 20 minutes, the coated trichloroisocyanuric acid is added. The assembly is then left in the rotating mixer for 20 minutes. The percentage of chlorine dosed by iodometry in the detergent composition is then%.

The detergent composition thus obtained is placed in firm plastic bags by an airtight tie. The bags are stored in a controlled atmosphere oven under the following conditions:

- temperature: 40 ° C

- relative humidity: 80 Z.

10 Samples are taken after a storage period of between 1 and 3 months, and the remaining chlorine is analyzed by iodometry.

Table 1 shows the results obtained after 50 days of storage for laundry compositions prepared from anhydrous sodium metasilicate and from trichloroisocyanuric acid coated with * 15 paraffin waxes used in percentages (by weight ) variables.

The results concerning the remaining chlorine are expressed in percentages compared to the initial chlorine.

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t TABLE 1,

Trichloroisocyanuric acid Detergent composition% chlorine remaining

Not coated with paraffin waxes 39 * t

Coated with 5% paraffin wax with a melting point of 50 - 52 ° C 81

Coated with 5% paraffin waxes with a melting point 40 - 42 ° C 78

Coated with 5% paraffin waxes with a melting point 58 - 60 ° C 68.5 fk \.

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r EXAMPLE 2.

Example 1 is repeated but using sodium metasilicate pentahydrate instead of anhydrous metasilicate as in Example I, for the preparation of the laundry compositions. Table 2 summarizes the results obtained.

t TABLE 2.

n ===== rc === 4i *

Trichloroisocyanuric acid Detergent composition% chlorine remaining

Kon coated with 14 * paraffin waxes

Coated with 5% paraffin wax with a melting point of 50 - 52 ° C 38.5

Coated with 5% paraffin waxes with a melting point of 40-42 ° C 26.5

Coated with 5% paraffin waxes with a melting point of 58-60 ° C 30 * * / t-x t • * *. · "· ► r B.

r EXAMPLE 3.

Examples 1 and 2 are repeated using paraffin waxes having a melting point of 40-42 ° C. The samples are taken after a storage period of 80 days. Table 3 shows the results obtained for detergent compositions prepared, either from anhydrous sodium metasilicate, or from sodium metasilicate * pentahydrate.

TABLE 3.

== sr: =: =: = ss 3 Z of chlorine remaining

Trichloroisocyanuric acid

Detergent prepared from- Detergent prepared from metasilicate from metasilicate sodium anhydrous sodium pentahydrate

Uncoated acid 20 10

Acid coated with 1 Z of 30 15 waxes

Acid coated with 2 Z of 60 25 4 e waxes ·

Acid coated with 5 Z of 78 26.5 waxes A, r ___ £ ___.

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Acid coated with 10 Z of 78 27 waxes /

Claims (4)

1. New detergent compositions containing a chloroiso-cyanuric derivative suitable for washing dishes in a washing machine and also containing a softening agent chosen from * polyphosp'nates, an alkalizing agent constituted at least partially by sodium silicates and a surfactant characterized in that the chloroisocyanuric derivative used is trichloroisocyanuric acid coated with a paraffin wax having a melting point below 60 ° used in an amount of 1 to 10% by weight of acid. 2. New compositions according to claim 1. characterized in that the amount of paraffin wax used is 3 to 5% by weight relative to the acid. 3. Process for the preparation of the new compositions according to claims 1 or 2, characterized in that the trichloroisocyanuric acid is coated with paraffin wax before being mixed with the other constituents of the detergent. · „4) Preparation process according to claim 3 characterized by the fact that the molten wax is sprayed on trichloroiso cyanuric acid heated to 50 ° C. /