DE2340161C2 - Detergent powder - Google Patents

Description

The invention relates to detergent powder, which otd as a means for the release of dirt Contain non-ionic, water-soluble cellulose ethers to prevent redeposition. Examples of these means are Hydroxyäthylmethylzellulosen, Hydroxypropylmethylzellulosen and Äthylhydroxyäthylzellulosen. at According to the invention, the class of alkyl celluloses can be used as starting material, e.g. B. the In the DE-OS 21 38 731 described substances.

The invention is applicable to nonionic cellulose ethers whose solubility in a detergent formulation decreases as the temperature rises. In particular on cellulose ethers, whose solubility contributes 60 ° C lower than at 20 ° C.

It has been found that when cellulose ethers are added to detergent powder, these are commercially available available materials did not have sufficient solubility at higher temperatures (60 to 80 °), and so on remained undissolved at the end of the wash cycle. This low solubility rate as well as the ineffectiveness can cause build-up of materials in and on the filters of a washing machine Machine washed goods.

It has now been found that to achieve an efficient application of the cellulose ethers as dirt-dissolving Average these materials into detergent powder with a particle size below 0.25 mm and preferably below 0.20 mm should be used. So the particle size of the cellulose ether will be £ 0 decreased that it was by a 0.25 mm sleb. preferably a 0.20 mm slab, and most preferably one Pass the 0.15 mm sieve.

These fractions of specific particle size must be present in a larger proportion, namely 75 % By weight of the cellulose ether present, preferably 80% by weight and particularly preferably 90% by weight.

The decrease in solubility can occur with the passage of a cloud point of the solution for the cellulose ether be connected. It has been found that the decrease in solubility can occur rapidly.

The surfactant materials used are known per se, generally in the detergent field substances used. An old common overview is In "Surface Active Agents", Vol. I and II of Schwanz and Perry (Interscience 1949) and Schwartz, Perry and Berch (Interscience 1958), respectively.

The invention is particularly advantageous when using Äthylhydroxyäthylzellulosen, which one Äthylsubsiltutionsgrad of about 2, preferably about 1.5 and a Hydroxyäthylsubstltutlonsgrad of about 0.2 to about 1.2, preferably from about 0.4.

It is completely surprising that the soil release properties at higher temperatures below Use of a material below a specific particle size despite the reduced solubility these higher temperatures can be increased. Indeed, the detergent can be made by dissolving the detergent powder Separated in very hot water of about 80 ° C and filtering off the agent. The cellulose ethers which are used according to the invention are usually in one / amount of in the formulation about 0.5 to about 2.0% by weight of the total formulation, however, the invention is not limited to this range

limited. Apparently there are no restrictions on the method by which the cellulose jw

ether is added, in this case the agent for preventing redeposition can be added to the spray.

dried powder or added to the sludge prior to spray drying. Be it

Note that the agent in addition to the slurry while the advantages as a result of spezlfi- '

see size maintains. ".,

Any required reduction in size can be achieved, for example, by grinding between the particles H,

self or mechanical comminution using devices with high air flow rates ^

can be achieved. $

One way of working according to which the reduction in particle size can be achieved uses %

a jet mill in which the pellet-shaped material is contained within a structure with a cylindrical geometry

a series of suitably positioned air nozzles is used to swirl the air. The | '

Fine particles produced by the grinding move to the center of the cylinder, from where they In | ^:

removed by airflow to a product collector. The temperature of the In the Felnstmahleln direction;

The air used must be below both the softening point and the decomposition point of the cellulose ether lie. Another piece of equipment used to reduce particle size is a cutting mill.

The particles of the anti-redeposition agent may be contained in an extrudable, organic Material embedded and transferred into noodle form. The pellet-shaped material comes with the extra Γ

negotiable. organic solid mixed, e.g. B. a mixture of sodium lauryl sulfonate and a synthetl-;

see, unbranched, primary C, 2_ _u -alcohol ethoxylert rr.'t 8 mol EO. The mixture can be an extrusion

sen and subjected to ball formation in a corresponding device (e.g. on a Marumerizer machine) will. A method of embedding cleaning fluid locations in extruders. organic Materials Is described in British Patent 12 04 123.

The invention is illustrated by the following examples, which can be achieved according to the invention Show improvements.

example 1

A detergent formulation containing 14% sodium dodecylbenzenesulfonate and 40% sodium tripolyphosphate was textured for washing a range of test sticks! Yarn made of polyester fibers at 50 ⁰ C using a product concentration of 0.5% applied. 1.0% of a sample of cellulose ether was added to each formulation. Each sample of the cellulose ether was a selected fraction of the sieve. The increase in reflection ability (JR) achieved with each sieve fraction is given in Table I below.

Table I.

AR

Sieve fraction> 0.5 mm 6

0.3-0.5mm 7

0.21 to 0.3 mm 11

0.15 to 0.21 mm 48

<0.15 mm 50

From this it can be seen that the particle size should be less than 0.25 mm in order to obtain good detergency.

Example 2

The ethyl hydroxyethyl cellulose of Example 1 was made into a control formulation with the following Components applied:

Sodium dodecylbenzenesulfonate 19% by weight

Sodium tripolyphosphate 45% by weight
Sodium silicate 6% by weight

Sodium sulfate (anhydrous) 15% by weight Water, brightener, etc. 15% by weight

The cellulose ether was used in amounts of 0.5, 1.0 and 1.5% in the formulation. Specimens from textured! Polyester yarn was first washed using a Terg-O-Tometer of the formulation in an amount of 0.3% by weight / volume for 10 minutes at 60 ° C. and at 100 revolutions subject per minute. The specimens were then stained with dirty motor oil and again Washed under the same conditions as before, but without the dirt-removing agent. The dirt loosening effect was measured as the change in reflectivity (JR).

This washing process was repeated for a range of screen sizes, the results are in the following Table II compiled. The surprising increase in effect with reduced particle size is can be seen from this.

Table II

% Cellulose Δ R with a particle size in mm

in the product 0.5-0.355 0.3-0.25 0.21-0.18 0.15-0.125 0, i06-0.075 <0.045 "

0.5 <1 <1 <1 3 4 12

1.0 <1 2 2 9 12 31

1.5 5 5 16 25 42 40

Example 3

The influence of temperature on the efficiency of the cellulose ether as a dirt-removing agent was using test pieces of textured polyester yarn and the lubricant formulation from Example 2 examined. In a first washing process, the specimens were washed in detergent solutions,

which contained 0.3 * of the formulation, which in turn contained 1.5 * of the cellulose ether of Example 2. cerium The difference between the wash liquor samples consisted of the sieve fraction of the cellulose ether contained in each was included. One sample contained the fraction from 0.25 to 0.33 mm and the other the fraction from 0.125 to 0.15 mm. After washing at 100 revolutions per minute for 10 minutes at the specified Temperature, the pieces were stained with dirty motor oil and kept at 60 ° C using the previously mentioned system washed without the soil release agent. The trials were at 20, 40, 60 and 80 ° C performed in two passes at each temperature, and the change in reflectivity (JR) was decided. From the following Table III it can be seen that the fraction of the cellulose ether with larger Particle gave poorer results after the first few washes at higher temperature. Under use of the material with the smaller size, the dirt-releasing ability was kept at a high value, even if the higher temperature was applied first.

Table III Particle size Test 2 average 0.15-0.125 mm Test 2 average 0.3-0.25 mm 29 35 Test 1 27 32 Dirt loosening capacity (Δ R) Test 1 4th 3 37 23 2G Washing 41.0 2 2 17th 34 36.5 temperature
CC) 2 5 9.5 39 31 35 2 39 20th 14th 40 60 80

This gives rise to the advantages of using a material of a specific size, taking care of it it should be noted that the material is not completely In at these higher temperatures of 60 ° and 80 ° C Solution was.

Example 4 Example 2 was repeated, using a number of cellulose ethers at 1.5% by weight in the specified Standard formulation was used. The change in reflexion ability (JR) and the percentage of Oily soil removal (% OES) were measured using four test fabrics in two separate experiments

were used, d. H. two pieces of fabric per attempt. The wash liquor was at 60 ° C.

The results are in the following Table IV for fractions from 0.3 to 0.25 mm (large) and 0.15 to

0.125 mm (small) indicated. The cellulose ethers generally show an improvement when that is Material with smaller particle size is used. The table gives the cellulose ethers by the alkylsubstltutlons- and hydroxyalkyl substituent values.

Table IV Hydroxyalkyl AR 2.3 small %EYELET 5.1 13.7 small Cellulose ether (Control) great great 37.5 Alkyl 0.5 HO.Et 10.0 60.0 24.1 no 0.8 HO.Et 6.3 24.2 56.5 54.0 1.5Et 0.15 HO.Et 15th 38.9 80.3 1.0Et no 28.2 33.9 74.0 1.5Me 26.3 1.8Me

Claims (4)

Patent claims: 1. Detergent powder with a washing-active material and a water-soluble, non-ionic one Cellulose ether, which in a solution of the detergent powder decreases with increasing temperature Has solubility, as dirt suspending agent !, characterized in that the suspending agent is present in a particle size at least 75% by weight passes through a 0.25 mm sieve. 2. detergent powder according to claim 1, characterized in that the cellulose ether to at least 90% by weight passes through a 0.25 mm sieve. 3. detergent powder according to claim 1 or 2, characterized in that the limit size of the Cellulose ether passes through a 0.20 mm sieve. 4. detergent powder according to claim 3, characterized in that the size is 0.15 mm.