CS274539B1 - Laundry agent with increased bleaching effect under low temperatures - Google Patents

Abstract

The solution concerns a production of laundry agents for low washing temperatures and improves their whitening efficiency. Its principle consists in setting the pH value of the application solution of the detergent containing from 4 to 25 percent by weight of whitening system based on sodium perborate or sodium percarbonate and activator to 8.2 to 9.1 by addition of 0.5 to 10 percent by weight of citric acid or polyacrylic acid in the following composition of the detergents: from 5 to 25 percent by weight of tensides, from 10 to 60 percent by weight of agglutinants, from 1 to 60 percent by weight of filling admixtures and from 0.001 to 15 percent by weight of special admixtures. The main advantages of the invention consist in ensuring good whitening efficiency with economically acceptable quantities of expensive activators.

Description

The invention 3e relates to the production of detergent compositions for low washing temperatures and solves an increase in their bleaching efficiency.

In recent years, the world's leading detergent manufacturers have been striving to produce compositions that provide sufficient efficacy at temperatures as low as 30-60 ° C against traditional white and fast-colored cotton underwear. One of the key issues of the detergent process that manufacturers have to overcome is to ensure a chemical oxidizing effect. This is achieved in the conventional detergent compositions by a simple content of perborate or sodium percarbonate, which is desired. temperatures above 60 ° C oxidatively attack various forms of contamination, such as fruit stains, etc. For products intended for washing at lower temperatures, this problem is solved by application of so-called perborate decomposition activators, whose principle of action is the formation of peracid even at low temperatures. Such industrially used activators are tetraacetylethylenediamine, pentaacetylglucose, tetraacetylethylglycoluril, acetylurea, acetylphthalimide, phthalic anhydride and the like. These substances are generally very expensive and are therefore not dosed in optimal amounts providing a high bleaching effect. It should be noted, however, that the optimum amount of activator in terms of bleaching results in a decrease in the detergent effect, in particular a reduction in enzymatic efficiency, and thus the dosage of activators is associated with a number of compromises. Relatively small amounts of activator are dosed to detergents of conventional composition, i.e., compositions having a pH of 9.6 to 10.5 of the application solution, resulting in low increased whitening properties and a slight decrease in conventional detergency performance. The effect of the positive effect of higher alkalinity on the detergency performance for some types of soils is apparent, but it is also achievable by less alkaline detergents with higher surfactant and complexing ingredients, or by selecting the appropriate enzyme type with optimum efficiency in the less alkaline area.

A significant increase in bleaching capacity at low levels of perborate decomposition activators is achieved by the invention of a detergent composition with increased bleaching effect at temperatures of 20 to 60 ° C achieved by adjusting the pH of the detergent solution used to a value of 8.2 to 9.1. , special additives and bleaching system from a mixture of sodium perborate or sodium percarbonate and an acetylated organic compound perborate decomposition activator characterized in that it contains 0.5 to 10% by weight of citric acid or a homo- or copolymer of acrylic acid or a mixture thereof, 5 to 25% wt. % surfactants, 10 to 60 wt. % of binding agents, 1 to 60 wt. % of fillers, 0.001 to 15 wt. % of special additives and 4 to 25 wt. whitening system. Among the surfactants, sodium alkylbenzene sulfonate and / or sodium alkanesulfonate or sodium N-olefin sulfonate or a soap of a 3-hydroxy or oxyethylenated fatty alcohol or a two- to four-component mixture of said substances are used.

The binder additives are selected from sodium polyphosphates, preferably sodium triphosphate or aluminosilicates or sodium nitrilotriacetate or sodium ethylenediaminetetraacetate or two

CS 274 539 ΒΙ to ternary mixture of these additives.

The fillers are water or sodium sulfate or a mixture thereof. By special additives are meant water glasses with a different SiO 2: TiO 2 module, or cellulose derivatives or optically brightening agents or perfumes or stabilizers.

The main advantages of the invention reside in providing good bleaching efficiency at low and economically acceptable proportions of costly activators.

Claims (3)

Examples 1. A conventional powder detergent preparation process produces a composition of 8% by weight sodium alkylbenzene sulfonate, 3.5% by weight. sodium soap, 3.5 wt. % of oxyethylene fatty alcohol, 35 wt. % sodium triphosphate, 6 wt. sodium perborate, 1.5 wt. % tetraacetylethylenediamine, 2.5 wt. % citric acid, 0.3 wt.%, brightener, 0.2 wt. % perfume, 1.0 wt. % carboxymethylcellulose, 33.5 wt. % sodium sulfate, 2 wt. % water solids (3.2: 1) and 3 wt. residual water. A detergent powder with an improved bleaching capability at low wash temperatures is obtained (when used in a conc. 5 gl ^-1 in water with a hardness of 10 ° I, the pH is 8.85). 2. A powder detergent having a composition of 6% by weight is prepared by a conventional manufacturing process. % sodium olefin sulfonate, 4 wt. sodium soap, 4 wt. % oxyethylenated fatty alcohol, 1 wt. % carboxymethylcellulose, 25 wt. % sodium aluminosilicate, 3.7 wt. % polyacrylic acid, 1 wt. % residual water, 2 wt. % acetylphthalimide, 1 wt. % phthalic anhydride, 0.3 wt. % brightening agents, 5 wt. % sodium percarbonate, 5 wt. sodium nitrilotriacetate, 17.2 wt. % sodium triphosphate, 0.8 wt. proteases of 300,000 activity Dg / g with an optimum efficiency at pH 8.7 to 9.1 and 24 wt. sodium sulfate. The detergent has, a concentration of 5 gl ¹ in water with a hardness of 10 ° M pH 8.7, and the solution has a high bleaching ability. A comparison of the bleaching and washing performance values of the detergents of Examples 1 and 2 and of the pH-dropping formulations of the products is shown in the following table, which shows the bleaching and washing performance values in the change of the optical remission values of the soiled or soiled standard. dyed cotton, with a detergent concentration of 5 gl ^-1 in water with a hardness of 10 ° N, according to the methods of the State Testing Laboratory No. 240. 3. A detergent composition of 7 wt. % sodium alkanesulfonate, 5 wt. sodium soap, 10% by weight, sodium pyrophosphate, 20% by weight, sodium triphosphate, CS 274 539 B1 1 wt. % ethylenediaraintetraacetate, 3 wt. water, 27.9 wt. sodium sulphate, 5 wt.%, water glass solids (2: 1), 1 wt. % carboxymethylcellulose, 0.2 wt. % perfume, 0.1 wt. % SiOg-based perfume stabilizer, 0.2 wt. % brightening agents, 0.6 wt. protease activity of 400,000 D / g, 10 wt. sodium perborate, 3 wt.%, pentaacetylglucose, 2 wt. % magnesium silicate, 2 wt.%, citric acid, and 2 wt. of a copolymer of acrylic acid with maleic anhydride. The high bleaching capacity of this detergent is made possible by the pH of the application solution - 8.9 ·