Classifications

• • C—CHEMISTRY; METALLURGY
  • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
  • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
  • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
  • C11D3/02—Inorganic compounds ; Elemental compounds
  • C11D3/12—Water-insoluble compounds
  • C11D3/124—Silicon containing, e.g. silica, silex, quartz or glass beads
  • C11D3/1246—Silicates, e.g. diatomaceous earth
  • C11D3/128—Aluminium silicates, e.g. zeolites
  • C11D3/1286—Stabilised aqueous aluminosilicate suspensions

Definitions

• the invention relates to storage-stable and flowable aqueous suspensions of water-insoluble sodium aluminum silicates with a silicate content of about 20 to 60% by weight, based on the weight of the suspension, and an additional content of a suspension stabilizer.
• Water-insoluble sodium aluminum silicates such. B. is known from DE-OS 24 12 837, used in the form of zeolites as phosphate substitutes in detergents.
• the disadvantage here lies in the need to use a component system which is present in such an amount as a percentage that the proportion of sodium aluminum silicate in the finished formulations is already noticeably reduced.
• expensive organic substance must be used, which makes the use in detergents less profitable, and which also causes wastewater problems.
• the subject of DE-OS 28 24 443 attempts to overcome the aforementioned disadvantages by stabilizing silicate suspensions as stabilizers by at least one hydroxyl-free, saturated or unsaturated aliphatic dicarboxylic acid with 3 to 10 carbon atoms or its alkali salt in an amount of 0. 5 - 15% by weight, based on the weight of the suspension, is proposed.
• the stabilization effect which can be achieved with these substances is satisfactory for zeolite / water suspensions in a weight ratio of 1: 1 during a storage time of 24 hours if the amount of dispersion stabilizer added, such as malonic acid, succinic acid or maleic acid, is at least 5% by weight.
• the aforementioned amount of stabilizer is still relatively high, so that efforts are being made to replace it with substances which are effective in a smaller amount.
• a simple test is proposed as a method for checking the stability of the suspensions disclosed in DE-AS 25 27 388, in which an aluminum silicate suspension of the desired concentration - for example 31% by weight - is produced, which contains a dispersant in such an amount that Adequate stabilization of the suspension is guaranteed.
• the influence of the added substance can then be visually observed in the settling behavior of the suspension.
• a preferred suspension should generally be at most so far removed that the protruding clear or silicate particle-free solution makes up no more than 20%, preferably no more than 10%, in particular no more than 6% of the total height.
• the settling behavior is checked, for example, in a standing cylinder at room temperature.
• aqueous aluminum silicate suspensions are well stabilized in the above tests if the dispersants proposed for stabilization are present in a concentration of 1.3-3% by weight, with a silicate content of approximately 50% by weight of the suspension.
• the present invention largely fulfills the above requirements.
• the invention relates to storage-stable and flowable aqueous suspensions of water-insoluble sodium aluminum silicates with a silicate content of about 20 to 60% by weight, based on the weight of the suspension and an additional content of a phos phosphoric acid mono- or diesters as suspension stabilizers, which are characterized in that the suspension stabilizer is a phosphoric acid mono- and / or diester of fatty alcohol ethoxylates with about 1 to 6 moles of ethylene oxide per mole of alcohol or a phosphoric acid mono and / or diester of a technical mixture of aliphatic alcohols with at least 20 carbon atoms, the amount of stabilizer being about 0.1 to 5% by weight, based on the weight of the suspension.
• the sodium aluminum silicate contained in the suspensions according to the invention preferably corresponds to the general formula of a zeolite of type A, Na 2 O Al 2 O 3 . (SiO 2 ) 2 . 4.5 H 2 O, the proportion of the silicate in the suspension usually being between 30 and 50% by weight, based on the weight of the suspension.
• the mixture of phosphoric acid monoesters and diesters of fatty alcohol ethoxylates is liquid at 20 ° C. and has a density of 1.02 g / cm 3 , an acid number of 128 mg KOH / g, measured up to the second transition point pH 9-10 in water / isopropanol 1: 1 and a P 2 0 5 content of 11% by weight.
• the mixture of phosphoric acid monoesters and diesters of aliphatic alcohols with at least 20 carbon atoms has a P 2 0 5 content of 10.3% by weight, a total acid number of 140 mg KOH / g Melting range from 65 - 66 ° C and a density of 0.94 g / cm 3 .
• the aforementioned stabilizer mixtures already have a good stabilizing effect in a concentration of 0.1 to 3.5% by weight, based on the weight of the suspension.
• the above phosphoric ester mixtures characterized in more detail by their physical properties, are commercially available products from Hoechst Aktiengesellschaft, Frankfurt / Main, and are commercially available under the name ° Knapsack-Phosphor Textreester 122 or ® Knapsack-Phosphor Acidester MDEC.
• the suspension stabilizers according to the invention are characterized by surprisingly good stabilization effects, in that they already have 90-100% stabilization in concentrations of 0.1-0.5% by weight for 24 hours and more of aqueous sodium aluminum silicate suspensions. To achieve such effects, stabilizer concentrations of at least 5% by weight were previously required.
• the substances according to the invention have the property, as a component of detergent compositions, to prevent foam formation and, moreover, to be wash-active.
• the sedimentation behavior of the zeolite was 50% by weight aqueous suspensions in the presence of Stabilisatoren® Knapsack phosphoric acid ester 122 and ®Knapsack phosphoric acid ester MDEC were tested in different concentrations at certain intervals.
• the first-mentioned stabilizer is a mixture of phosphoric acid monoesters and diesters of fatty alcohol ethoxylates which are liquid at 20 ° C. and have a density of 1.02 g / cm 3 , an acid number of 128 mg KOH / g, measured up to the second transition point pH 9-10 in water-isopropanol 1: 1 and a P 2 0 5 content of 11% by weight.
• the ®Knapsack phosphoric acid ester MDEC is a mixture of phosphoric acid monoesters and diesters of aliphatic alcohols with at least 20 carbon atoms, the P 2 0 5 content of which is 10.3% by weight and which has a total acid number of 140 mg KOH / g, a melting range of 65 - 66 ° C and a density of 0.94 g / cm 3 is characterized.
• the suspensions to be tested water was placed in a beaker, heated to 70 ° C. and then zeolite and optionally preheated ester were introduced with stirring at a stirring speed of 1000 rpm. After intensive mixing of the suspension, it was filled into 100 ml standing cylinders and then the settling behavior, ie the volume fractions of clear water standing above the suspension or the volume of the suspension, was measured at various time intervals. that no clear water layer formed and the suspension is completely stable. In the case of the rating number 80, the volume of the suspension is 80% of the total volume and the volume of the clear water density is 20%.
• the measured values obtained are shown in the table below.
• the table shows that the esters tested give aqueous zeolite suspensions sufficient stability even in concentrations of 0.1-0.5% by weight and thus outperform the known stabilizers used to date.

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• Chemical & Material Sciences (AREA)
• Inorganic Chemistry (AREA)
• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Wood Science & Technology (AREA)
• Organic Chemistry (AREA)
• Silicates, Zeolites, And Molecular Sieves (AREA)

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Citations (5)

• 1980
  • 1980-08-16 DE DE19803030955 patent/DE3030955A1/de not_active Ceased
• 1981
  • 1981-06-12 EP EP81104542A patent/EP0046171A1/fr not_active Withdrawn
  • 1981-08-14 DK DK362881A patent/DK362881A/da not_active Application Discontinuation

Patent Citations (6)

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