FR2548684A1 - DETERGENT COMPOSITIONS CONTAINING A CHLOROISOCYANURIC DERIVATIVE SUITABLE FOR WASHING DISHWASHERS IN WASHING MACHINE AND PROCESS FOR PREPARING THE SAME - Google Patents

Abstract

THE CHLOROISOCYANURIC DERIVATIVE USED IS TRICHLOROISOCYANURIC ACID COATED WITH A PARAFFIN WAX USED AT A RATIO OF 1 TO 10 BY WEIGHT OF THE ACID. APPLICATION TO THE WASHING OF DISHES IN A WASHING MACHINE.

Description

1. The present invention relates to novel detergent compositions

  suitable for washing dishes in a washing machine, and

their preparation process.

  Machine dishwashing involves both the detergent action of the detergent and the mechanical action of the water. Apart from its detergent action, the detergent must also have a 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 This is why the laundry compositions are formed in a known manner: a softening agent generally chosen from the class of polyphosphates. Among the polyphosphates used, mention may be made of

  sodium tripolyphosphate, sodium hexametaphosphate, sodium pyrophosphate, and the corresponding potassium polyphosphates.

  of an alkalinizing agent which consists mainly of a sodium metasilicate, either in its anhydrous form or in its pentahydrate form In known manner, the sodium silicate can be replaced

  partially with sodium carbonate, sodium sulphate or sodium hydroxide.

  a non-foaming surfactant of the nonionic type selected from the following classes of products: ethoxylated linear alcohols, ethylene oxide condensate on propylene oxide, oxyalkyl amines, polyethoxy ethers of fatty alcohols, alkyl ethoxylated phenols or phosphoric esters of fatty alcohols Preferably, for reasons of efficiency, biodegradability and costs, a surfactant is chosen

  of the class of ethoxylated linear alcohols.

and a disinfectant.

  The disinfectant used which releases active chlorine is

  generally a chlorinated solid product of the chloroisocyanuric derivative type.

  It is most often a sodium or potassium salt of dichloroisocyanuric acid. Until now, it has been practically used either an anhydrous sodium dichloroisocyanurate containing 63% of active chlorine or a sodium dichloroisocyanurate containing 56% of active chlorine, either an anhydrous potassium dichloroisocyanurate containing 59% of active chlorine, or a potassium dichloroisocyanurate monohydrate containing 56% of active chlorine, or a calcium dichloroisocyanurate tetrahydrate containing 56% of active chlorine Active chlorine is challenged as being the oxidizing power due to the positive chlorine To better understand what the positive chlorine corresponds to, it should be remembered that the chlorine present in the chlorinated derivatives described above is fixed on the nitrogen atom and

  it is in the form of the degree of oxidation + 1, that is Cl +.

  In the oxidation-reduction process, a Cl ion combines with two electrons to proceed to the Cl (chloride) stage. Two equivalents of oxidants are released which correspond to 71 g of elemental chlorine, although the atomic mass only 35.5 This also means that a Cl + atom has the same oxidizing power as a molecule of

elemental chlorine C 12.

  Of the other chlorinated disinfectants of the chloroisocyanuric family, there is one which is responsible for almost 91% of active chlorine: trichloroisocyanuric acid. It would therefore be advantageous to

  to use it, given its high percentage of active chlorine.

  Unfortunately, until now it has not been possible to use it because it has too much reactivity with the other constituents of the laundry compositions, in particular with regard to the surfactants. The lyes containing the acid trichloroisocyanuric are

  unstable in storage and lose both large amounts of chlorine and surfactants by mutual destruction.

  We have now found the means of stabilizing trichloroisocyanuric acid, in particular to stabilize it for the production of storage stable laundry compositions suitable for washing

  from dishes to washing machines.

  The present invention relates to a novel stable laundry composition suitable for washing dishes in a washing machine, containing a softening agent chosen from polyphosphates, an alkalizing agent chosen from sodium silicates, a nonionic surfactant, a chloroisocyanuric derivative characterized by the fact that the chloroisocyanuric derivative used is trichloroisocyanuric acid coated with a paraffin wax used at a rate of 1 to 10%

  by weight relative to the weight of the acid.

  3. It has been found that paraffin waxes are compatible with trichloroisocyanuric acid. Moreover, they make it possible to obtain, by using relatively small doses, good acid stabilization. Moreover, they are dispersible under the conditions described in FIG. washing compositions, that is to say in aqueous media having a temperature of 50 to 60 o C. The paraffin waxes consist of a mixture of high molecular weight solid hydrocarbons (for example C 36 H 74) , which have a melting point of less than 60 ° C. and greater than 40 ° C., a viscosity at 100 ° C. of less than 6 centipoise They are used in a proportion of 1 to 10% by weight relative to trichloroisocyanuric acid and preferably at 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 an amount greater than 10% does not significantly improve the storage stability of the laundry compositions. The use of amounts of less than 1% leads to too little stabilization of the acid.

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

  paraffin waxes that solidify on cooling.

  Trichloroisocyanuric acid coated with wax is then mixed into

  another mixer with the other components of the laundry.

  The quantities of the various constituents other than paraffin used for the manufacture of the new laundry compositions,

  The softening agent chosen from polyphosphates is used in a proportion of 25 to 60% by weight and preferably 40 to 50% by weight relative to the weight of the composition. .

  4. The basifying agent chosen from sodium silicates is used in a proportion of 30 to 70% by weight and preferably 40 to 60% by weight relative to the weight of the composition. In known manner, the sodium silicate may be partially replaced by sodium carbonate, sodium sulphate or sodium hydroxide The nonionic surfactant is employed in a proportion of 0.5 to 4% by weight and preferably in a proportion of 1 to 3% by weight. weight relative to the weight of the composition Trichloroisocyanuric acid coated with paraffin waxes is used

  from 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 pre-stabilized with paraffin waxes in the following manner: The acid is heated to a temperature of 50 ° C. and then placed in a bezel During the rotation of the bezel, it is sprayed with the aid of paraffin waxes. The operating temperature allows a good distribution of the waxes which solidify on cooling. The paraffin waxes used have a melting point below 60.degree. C. and a viscosity at 100.degree. C. below 100.degree. 6 centistokes Various acid mixtures and waxes are produced using varying percentages of paraffin waxes. The mixtures thus obtained are

  used for the manufacture of laundry compositions.

  Washers having the following composition are prepared (the parts are expressed in parts by weight).

  sodium tripolyphosphate: 50 parts sodium metasilicate (anhydrous or hydrated 5H20): 50 parts PLURAFAC RA 43 (ethoxylated nonionic surfactant manufactured by PCUK): 2 parts trichloroisocyanuric acid coated with paraffin waxes:

2 parts.

  Firstly, the pre-mixing of sodium tripolyphosphate is carried out

  and nonionic surfactant in a rotating type mixer.

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

5.

  After 20 minutes, the trichloroisocyanuric acid is added.

  The whole is then left in the rotating mixer for 20 minutes.

  The percentage of chlorine dosed by iodometry in the composition of

laundry is then 1.65%.

  The laundry composition thus obtained is placed in plastic bags closed by a non-hermetic link. The bags are stored in a controlled atmosphere oven under the following conditions: temperature: 40 ° C

relative humidity: 80%.

  Samples are taken after a storage period included

  between 1 and 3 months, and the remaining chlorine is analyzed by iodometry.

  Table I shows the results obtained after 50 days of storage for laundry compositions prepared from anhydrous sodium metasilicate and from trichloroisocyanuric acid coated with the aid of

  paraffin waxes used in varying percentages (by weight).

  The results for the remaining chlorine are expressed as percentages

compared to the initial chlorine.

6.

TABLE 1.

  Trichloroisocyanuric acid Laundry composition% chlorine remaining Not coated with paraffin waxes 39 Coated with 5% paraffin waxes having a melting point 50 52 C 81 Coated with 5% paraffin waxes having a melting point 40 42 C Coated with 5% paraffin waxes having a melting point 58 60 C 68.5 7.

EXAMPLE 2

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

TABLE 2.

  Trichloroisocyanuric acid Laundry composition% chlorine remaining Not coated with paraffin waxes 14 Coated with 5% paraffin waxes having a melting point of 50 52 C 38.5 Coated with 5% paraffin waxes having a melting point 40-42 C 26.5 Coated with 5% paraffin waxes having a melting point of 5860 C 30 8.

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 gives the results obtained for laundry compositions prepared either at from anhydrous sodium metasilicate, either from sodium metasilicate pentahydrate.

TABLE 3.

  % of remaining chlorine Trichloroisocyanuric acid Detergent prepared from Detergent prepared from heap tasilicate from sodium silicate sodium anhydrate pentahydrate Uncoated acid 20 Acid coated with 1 Z of 30 wax Coated acid with 2% of 60 25 waxes Coated acid with 5% of 78 26.5 waxes Coated acid with 10% of 78 27 waxes

Claims (4)

  1) Novel detergent compositions containing a chloroisocyanuric derivative suitable for washing dishes in a washing machine and also containing a softening agent chosen from polyphosphates, an alkalinizing agent consisting at least partially of sodium silicates and a surfactant characterized in that the chloroisocyanuric derivative used is   trichloroisocyanuric acid coated with a paraffin wax used in a proportion of 1 to 10% by weight of the 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) A method of preparation according to claim 3 characterized in that the molten wax is sprayed on trichloroisocyanuric acid heated to 50 C.