FI83666B - RENGOERINSMEDEL OCH FOERFARANDE FOER DESS FRAMSTAELLNING. - Google Patents

Description

1 83666

Detergent and method for its preparation

The invention relates to a cleaning agent suitable for textile surfaces, in particular to textile floor coverings 5, consisting essentially of a porous finely divided carrier, and to a process for preparing the cleaning agent, in which the carrier is a foamed softened urea-formaldehyde resin and is enriched in a cleaning agent. The volume weight of the 10 products relative to the carrier is 20 to 60 kg / m3 and the vibrating weight is 50 to 150 g / l, the grain size of the carrier is 0.01 to 12 mm and the surfactant-containing water contained in the carrier is up to 80% by weight of the carrier. is completely homogeneously stored inside the carrier, and the cleaning agent is obtained by mixing the carrier with a highly concentrated aqueous cleaning solution.

The purpose of such methods of manufacturing detergents is to be able to produce a rationally and environmentally friendly detergent which can be used without any negative effects in a single operation. One such negative effect occurs when urea-formaldehyde resin foam, which is volatile in the formaldehyde-25 hyd, which is essential for production, is released into the room air during the purification process. To avoid this, methods are known in which the amount of formaldehyde released from the urea-formaldehyde resin foam is reduced by the subsequent addition of formaldehyde-binding agents.

Thus, for example, DE-A-2 917 064 discloses a method for reducing the development of formaldehyde from aminoplastic foams, in which the finished foam is surface-treated with a substantially non-volatile, formaldehyde-binding, moisture-absorbing agent. The formaldehyde-binding agent 2 83666 must then be an aqueous solution of a urea or sulfuric acid salt or an aqueous mixture of urea, ammonia, ammonium sulphite and a water-retaining or absorbent.

The disadvantages of such methods are that these substances have to be subsequently added to the cellular plastic or aminoplastic carriers, which means, above all, an additional step in the process. A further disadvantage is that in this way the distribution of formaldehyde-binding substances, in particular non-comminuted substances, is inhomogeneous, which in turn leads to a higher release of formaldehyde during the production of the foam and further during the production of the cleaning agent.

In addition, a process is known in which the formaldehyde content required for the preparation in the moist aminoplastic carriers of the cleaning agents is reduced by combining the active ingredient solution and the formaldehyde-binding agents urea and sulfite.

A disadvantage of all known methods is that the production of a granular carrier made by grinding 20 foamed urea-formaldehyde resin requires expensive, environmentally friendly measures due to the high formaldehyde emission therein.

In view of the disadvantages of the above solutions, it is an object of the invention to provide a process for preparing a cleaning agent suitable for textile surfaces, by which the urea-formaldehyde resin foam used as a carrier is kept almost free of free formaldehyde during the manufacturing process while maintaining the mechanical properties of the foam.

The object of the invention is achieved in that the free formaldehyde present is bound during the manufacturing process before and / or during the foaming of the plasticized urea-formaldehyde resin by adding formaldehyde-binding agents to the blowing agent solution and / or 3,83666 or resin solution or a modified aerosol.

A further embodiment of the invention is based on adding urea to the aqueous urea-formaldehyde precondensate before and / or during foaming, so that the ratio (molar ratio) of total urea to total formaldehyde in the finished foam is 0.62: 1 to 0.95: 1, and that the aqueous before and / or during foaming, 0 to 1.64% by weight of sulphite (SO 3 ') (based on the dry matter of the resin) in the form of a water-insoluble salt of sulfuric acid is added to the urea-formaldehyde precondensate and that the aqueous resin precondensate solution and / or foaming during curing (polycondensation), 0.001 to 5% by weight of thixotropic agents (such as layered silicate (= bentonite) or aerosol) are added to stabilize the urea-formaldehyde resin foam.

The invention is illustrated by the following examples and the idea of the invention is clarified in the diagram:

Resin component A consists of aqueous solutions of precondensed urea-formaldehyde resin in which the ratio of total urea to total formaldehyde is 0.65: 1 and 25 with a solids content of 44% by weight.

Hardener surfactant concentrate component B consists of an aqueous solution containing a mixture of phosphoric acid (30%) and alkyl naphthalene sulfonate (10%).

In addition to phosphoric acid and surfactant 30 (e.g. alkyl naphthalene sulfonate or alkyl benzene sulfonate), the blowing agent also contains foam stabilizers. All thixotropic agents can be used for this purpose, such as layered silicates, aerosols, xanthanes, calcium hydrogen silicate, suitable aluminas, etc.

4 8 3 6 6 6

Comparative Example 1 (conventional method)

Prepare 1 m3 of urea-formaldehyde resin foam having a bulk density of 40 kg / m3 by foaming 56 parts by weight of a hardener surfactant dilution consisting of 3 parts by weight of hardener surfactant concentrate B and 53 parts by weight of water with about 1 m3 of air in a suitable flotation apparatus. by mixing it with 111 parts by weight of a resin diluent prepared from 91.5 parts by weight of resin component A and 19.5 parts by weight of water, and performing flotation in a mold 10. The foam block thus prepared and cured is sampled for formaldehyde and strength.

Comparative Example 2 (Foam with formaldehyde binders) 15 A 1 m3 urea-formaldehyde resin foam having a bulk density of 40 kg / m 3 is prepared by foaming 56 parts by weight of a hardener surfactant dilution formed from 3 parts by weight of hardener surfactant concentrate B and 53 air in a suitable flotation device and reacting it appropriately with a condensed mixture of 91.5 parts by weight of a mixture of resin component A and water (19.5 parts by weight) and urea (2.9 parts by weight). Samples of this prepared and cured foam block are sampled for strength determination.

Comparative Example 3 (foam according to the invention with formaldehyde-binding and foam-stabilizing agents (Benton rivet))

Prepare 1 m3 of urea-formaldehyde resin foam with a bulk density of 40 kg / m3 by foaming 56 parts by weight of a hardener surfactant dilution consisting of 3 parts by weight of hardener surfactant concentrate B and 53 parts by weight of water with about 1 m3 of air in a suitable flotation apparatus and react appropriately with a combined mixture of 91.5 parts by weight

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5 8 3 6 6 6 Component A and water (19.5 parts by weight), urea (4.4 parts by weight), sulphite (0.027 parts by weight; for example, sodium bisulphite) and bentonite (0.06 parts by weight) ) of the mixture. The pH of the resin solution is then adjusted to 7-8.

5 Samples of this prepared and cured foam block are taken for the determination of formaldehyde.

Comparative Example 4 (Foam with Formaldehyde Binding and Foam Stabilizers (Modified Aerosil) According to the Invention) 1 m3 of urea-formaldehyde resin foam having a bulk density of 40 kg / m3 is prepared by foaming 56 , 0.16 parts by weight of modified aerosol and 52.84 parts by weight of water, 15 with about 1 m3 of air in a suitable flotation device and reacting it in a suitable manner with a condensed mixture consisting of 91.5 parts by weight of resin component A and a mixture of water (19.5 parts by weight) and urea (2.9 parts by weight). 20 resin clumps prepared and cured are sampled for strength.

To determine the amount of free formaldehyde analytically relative to the dry matter of the resin, the formaldehyde is separated from the powdered cured moist foam resin in a suitable apparatus by means of warm air and absorbed into a downstream group of wash bottles filled with water.

The formaldehyde content of the absorption solutions is determined photometrically. To these are added the two solutions A and B shown below, and the intensity of the red-violet color formed is measured photometrically. A comparison is then made with solutions of known formaldehyde content.

Solution A (p-rosaniline hydrochloride) 35 160 mg of p-rosaniline are dissolved in 24 ml of concentrated 6 8 3 6 6 6 hydrochloric acid, and distilled water is then added to the solution to a total volume of 100 ml.

Solution B

27.2 g of mercuric chloride and 11.6 g of sodium chloride are dissolved in distilled water, and the total volume of the solution is made up to 1. 1. 50 ml of this solution are mixed immediately before use with 100 mg of anhydrous sodium sulfite.

Mix one absorption solution in a 25 ml volumetric flask with 1 ml of both solution A and solution B, and make up to the mark with distilled water. The solution is mixed well and kept at 20 ° C for 60 minutes. The extinction of the red-violet color is then measured at a wavelength of 564 nm with a layer thickness of 2 cm. To calculate the formaldehyde content of Form-15, the extinction of the solution is compared with solutions containing 10, 20, 30 and 40 ug of formaldehyde in 25 ml of solution.

The measurement results shown schematically in Figure 1 are repeated in the following Table 1:20

table 1

Example 1 8.8 mg of formaldehyde / g of dry matter 25

Example 3 1.8 mg formaldehyde / g foam solids according to the invention The following Table 2 shows the stabilizing effect of the stabilizers used according to the invention; the strength has been tested in accordance with DIN 53577 and DIN 53421.

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Table 2

Example 1 Foam prepared by a conventional method 0.087 N / mm2 (without 5 formaldehyde binders)

Example 2 Foam prepared by a conventional method 0.073 N / mm2 (urea and bisulphite as formaldehyde binding agents)

Example 3 Foam according to the invention 0.082 N / mm 2 (bentonite as stabilizer) 15

Example 4 Foam according to the invention 0.088 N / mm 2 (aerosol as stabilizer)

Claims (5)

A process for the preparation of a cleaning agent suitable for textile surfaces, especially for textile floor coatings, consisting mainly of a porous, fine-grained carrier which is a foamed, softened urea formaldehyde resin enriched with cleaning agents , wherein the finished product has a volume weight of 20 - 60 kg / m3 in relation to the carrier material and a shock weight of 50-10 150 g / l, the grain size of the carrier belt is 0.01 - 12 mm and the surfactant-containing water of the carrier material, the proportion of which is not more than 80% by weight of the carrier frame weight is completely homogeneously stored in the carrier material, and the detergent is prepared by mixing the carrier material with an extremely strong aqueous cleaning solution, characterized in that the free formaldehyde binds during the production process before and / or during foaming. the softened urea formaldehyde resin by adding general formaldehyde binding in the blowing agent and / or resin solution and as a stabilizing agent bentonite, aerosol or modified aerosil, provided that sulfite is not added sulfite as formaldehyde binding agent. 2. A process according to claim 1, characterized in that in the aqueous urea formaldehyde precondensate before and / or during foaming, urea is added such that the ratio (molar ratio) of the total amount of urea to the total formaldehyde amount in the finished cellular plastic is 0.62: 1 - 0.95: 1. 3. Process according to claim 1 or 2, characterized in that in the aqueous urea formaldehyde precondensate before and / or foaming 0 - 1.64 wt.% Sulphite (SO 3 ") (calculated on the dry matter content of the resin) is added in the form of a non-water-soluble sait of sulfur acidity 35 4. A process according to claim 1, 2 or 3, characterized in that in the aqueous resin precondensate solution and / or in the blowing agent solution thixotropic bentonite, aerosil or modified aerosil is added in an amount of 0.001-5% by weight under cure 5 (polycondensation) to stabilize the urea formaldehyde resin foam. 5. Cleaner for textile surfaces, especially for textile flooring material, which consists mainly of a porous, fine-grained carrier and the carrier 10 consists of foamed, softened urea formaldehyde resin enriched with purifying agents, the finished product having a volume of 60 kg / vol. cm3 in relation to the carrier and a shock weight of 50 - 150 g / l, the grain size of the carrier belt is 0.01 - 12 mm and the surfactant-containing water of the carrier, the proportion of which is at most 80% by weight of the weight of the carrier, is fully homogeneously stored in carrier fermenter and the cleaning agent are prepared by mixing carrier fermenters with an extremely strong aqueous cleaning solution, characterized in that the free formaldehyde is bonded during the manufacturing process before and / or during the foaming of the softened urea formaldehyde resin by admixing in the blow molding solution / admixture solution. substances and as stabilizers bentonite, aerosil or modified aerosil, provided that sulphite is not added as a formaldehyde binding agent in the blowing agent solution.