DE2556544A1 - Detergent for dish washing machine - contains alkali-stable, low-foam nonionic polyglycol tert. butyl ether - Google Patents

Abstract

Detergent for dish washing machines contains a nonionic polyglycol tert.-butyl ether (I) of the formula R-O(XO)n-Bu-t (in which R is a 6-22C alk(en)yl gp., pref. 8-14C alkyl gp., X is a 2-3C alkylene gp. n= 5-50, pref. 5-30), pref. in an amt. of 0.5-20 wt.%. (I) form very little foam in aq. soln. and can be used as foam suppressants for nonionic and cationic cpds. They are stable in alkaline soln., even in the presence of caustic alkali, and have excellent detergent and wetting properties. In an example an alkaline detergent consisted of 2.0 (wt.) pts. (I) (in which R is 10-12C alkyl, X is -CH2CH2- and n=10), 41.5 pts. Na2SiO3, 35.0 pts. Na5P3O10, 1.5 pts. Na dichloroisocyanurate and 20.0 pts. Na2CO3.

Description

Machine dishwashing detergent

The present invention relates to the sending of mail more easily and Caustic alkali-resistant polyglycol tert-butyl ether in dishwasher detergents.

Detergents are known which are polyoxyethylated as nonionic surfactants Contain alkylphenols and polyethylated fatty alcohols. These surfactants possess very good surface-active properties and meet in terms of cleaning effect the requirements. In many areas of application, such as. B. when used as Detergents in dishwasher, however, affects the strong foaming power (Read out connections unfavorably.

Attempts have already been made to reduce the strong tendency to foam such detergents by using suitable components, such as B. of block polymers Polypropylene Glycol and Ethyl oxide or other known foam control systems to reduce. However, satisfactory results are always sufficient obtain. A disadvantage of using the known nonionic surfactants Compounds is also that these products in the presence of strongly alkaline substances, z. B. of alkali hydroxides, alkali silicate or alkali phosphates, not sufficient are stable. The non-ionic products are affected by the action of alkalis Decomposition and / or discoloration.

Alkyl or alkylphenol polyglycol ether benzyl ethers have these disadvantages not on. However, these products are not biodegradable.

It has now been found that one can alkyl polyglycol ethers, which endv constantly via an ether bond through a tert. Butyl group are closed with special Advantage as a surface-active component in wetting agents, detergents and cleaning agents can use.

The invention relates to cleaning agents, in particular machine dishwashing agents, the nonionic polyglycol tert-butyl ether of the general formula I. contain, where R is a lipophilic group, preferably a straight-chain or branched alkyl or alkylene radical having 6 to 22, in particular 8 to 18 carbon atoms, n is 5 to 50, preferably 5 to 30, and X is an alkylene radical having 2 to 3 Carbon atoms, the ether chain (X - 0) consisting entirely of ethoxy units or containing at most n / 5 isopropoxy units.

The polyglycol ether tert-butyl ether of the formula I can be prepared in a manner known per se, e.g. B. by reacting the alkyl polyglycol ethers with isobutylene in the presence of an acidic catalyst such as p-toluene sulfonic acid or sulfonic acid ion exchange resin.

The products to be used according to the invention show in aqueous solution an extremely weak tendency to foam. You can therefore with particular advantage as Foam suppressors for nonionic and cationic compounds are used.

The products according to the invention are also available in alkaiise.el solution and resistant in the presence of caustic alkali. They have excellent surfactants Properties and can therefore be of particular advantage for such uses are used, which have good cleaning and wetting properties but none or only low foaming are required.

Because of their good alkali tolerance and their foam-suppressing properties Properties, the compounds of the formula I are advantageously suitable for the preparation of detergents and cleaning agents, especially for cleaning glass, dishes and bottles and the same. The products or mixtures of the products according to the invention are suitable for the production of liquid or solid cleaning agents. You can expediently in combination with other common nonionic, cationic or anionic surface-active substances builder substance and other additional or Auxiliaries in the detergent and cleaning agent formulations come to use.

The content of Formula 1 products in detergents and cleaning agents can vary within wide limits. It is depending on the purpose and conditions. the Cleaning agents are generally about 0.5 to 20, in particular 1 to 10 wt .-%. However, quantities that go beyond this range can also be used without further ado Application.

Particularly favorable performance properties are shown by those alkyl polyglycol ether tert-butyl ethers of the formula I in which R is a relatively short-chain alkylene radical with, in particular, 8 to 11 carbon atoms. Such products are for example: The following application examples show the advantageous properties of cleaning agents according to the invention with a content of compounds of the formula I.

Example 1: An alkaline detergent for dishwashers consists of the following components: 2.0 parts by weight of the product (A) 41j5 parts by weight anhydrous nitrate silicate 35.0 parts by weight sodium tripolyphosphate 1.5 parts by weight of the sodium salt of dichloroisocyanuric acid 20.0 parts by weight of sodium carbonate Das liquid product (A) is mixed with the remaining powdery substances sprayed on.

Example 2: The liquid setting of a rinse aid has the following Composition: tl parts by weight of product (C) 3 parts by weight of a reaction product of 1 mole of isotridecyl alcohol with 5 moles of ethylene oxide and 20 parts by weight of citric acid 66 parts by weight of water The Rinse aid tested at 80 C and an amount of 0.5 g / l. Even when in use Hard water left no deposits or haze on the items to be washed on. The foaming was low.

Example 3: An alkaline bottle detergent was made by niche the following components are prepared: 25 parts by weight of pentanatriur nitripolyphosphate 25 Parts by weight of sodium metasilicate 32 parts by weight of sodium carbonate 15th Parts by weight of sodium hydroxide (powdered) 3 parts by weight of the product (A) Das Bottle detergent shows when used in a bottle washing machine no foaming.

At an application concentration of 1.5 wt.% Beer and Milk bottles, some of which were still labeled, cleaned perfectly. The labels were peeled off well.

The cleaning agent shows no discoloration even after long periods of storage.

The cleaning agent described in Example 1 was made in accordance with DIN 53902 (Whipped foam number) compared to a similarly structured machine dishwashing detergent checked that instead of the product (A) according to the invention, the same amount of a Reaction product of 1 mole of isotridecyl alcohol with 10 moles of ethylene oxide contained (Product 1). The tests were each in water of Oo and 150 German hardness, at 400C with a detergent concentration of 5 g per liter, each with and without items to be cleaned (with load / without load). The foam height was measured immediately and after 5 minutes.

Table 1 Foaming behavior of dishwasher detergents according to Example 4, foam height in cm3 at 400C (DIN 53902) Product water Oo dH water 15 dH without bel. with at. without case. with at. immediately n.5 immediately n.5 'immediately n.5' immediately o5 ' (A) - - - - - - - - (1) 90 70 100 60 90 60 80 60 - = no foam The foaming behavior of the bottle cleaning agent described in Example 3 was investigated in comparison with bottle cleaning agents of similar structure, which instead of product (A) only contain the same amount of a) a reaction product of 1 mol of isotridecyl alcohol with 10 mol of ethylene oxide (bottle cleaning agent X) and b) an addition compound of 12 moles of ethylene oxide and 1 mole of hexadecyl alcohol, which was further reacted with 1 mole of benzyl chloride (bottle cleaning agent Y).

The foam tests were carried out in accordance with DIN 53902 with and without items to be cleaned (with load / without load) at 20 °, 50 ° and 70 ° C with solutions in water of 0 ° and 15 ° German hardness pre-norms, the liter 5 g of the respective bottle cleaning agent contained. The foam height was measured α immediately and β after 5 minutes.

The results compiled in Table 2 clearly show the superiority of the bottle cleaning agent according to the invention over the products used for comparison. Table 2 Foaming behavior of bottle cleaning agents according to Example 3 Foam height in cm Water 20 ° C 50 ° C 0 dH 15 dH 0 dH 15 dH Product without exposure with Bel. without bel. with Bel. without bel. with Bel. without bel. with Bel. sof. n. 5 'sof. n. 5' sof. n. 5 'sof. n. 5' sof. n. 5 'sof. n. 5' sof. n. 5 'sof. n. 5' (X) 80 60 100 80 80 60 80 70 70 50 80 60 70 50 80 60 (Y) 60 40 70 40 70 40 80 40 10 - 20 10 - - - - (A) - - - - - - - - - - - - - - - - - - = no foam water Product without exposure with Bel. without bel. with Bel. sof. n. 5 'sof. n. 5' sof. n. 5 'sof. n. 5' (X) 50 20 70 40 70 40 70 40 (Y) - - - - - - - - (A) - - - - - - - - - = no foam

Claims (3)

Patont claims: / 1. Machine dishwashing detergents characterized by a content of compounds of the general formula I. in which R is an alkyl or alkenyl radical with 6 to 22 carbon atoms, X is an alkylene radical with 2-3 carbon atoms and n = 5 to 50. 2. Maschinengeschrrsülmittel according to claim 1, characterized in that that in the general formula I P stands for an alkyl radical having 3 to 14 carbon atoms and n stands for 5 to 30. 3. Machine dishwashing detergent according to claim 1 or 2, characterized in that that they have a content of aii compounds of the general formula I of 0.5-20% by weight exhibit.