WO2006119162A1 - Warewashing system containing low levels of surfactant - Google Patents
Warewashing system containing low levels of surfactant Download PDFInfo
- Publication number
- WO2006119162A1 WO2006119162A1 PCT/US2006/016582 US2006016582W WO2006119162A1 WO 2006119162 A1 WO2006119162 A1 WO 2006119162A1 US 2006016582 W US2006016582 W US 2006016582W WO 2006119162 A1 WO2006119162 A1 WO 2006119162A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rinse
- surfactant
- wash
- drying
- test
- Prior art date
Links
- 239000004094 surface-active agent Substances 0.000 title claims abstract description 122
- 238000000034 method Methods 0.000 claims abstract description 149
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- 238000005406 washing Methods 0.000 claims abstract description 25
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- 239000000843 powder Substances 0.000 claims description 21
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- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 9
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- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 1
- DBVJJBKOTRCVKF-UHFFFAOYSA-N Etidronic acid Chemical class OP(=O)(O)C(O)(C)P(O)(O)=O DBVJJBKOTRCVKF-UHFFFAOYSA-N 0.000 description 1
- 241000233866 Fungi Species 0.000 description 1
- 229920001202 Inulin Polymers 0.000 description 1
- 239000005639 Lauric acid Substances 0.000 description 1
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 235000021314 Palmitic acid Nutrition 0.000 description 1
- 102000035195 Peptidases Human genes 0.000 description 1
- 108091005804 Peptidases Proteins 0.000 description 1
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical class [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 1
- IYFATESGLOUGBX-YVNJGZBMSA-N Sorbitan monopalmitate Chemical compound CCCCCCCCCCCCCCCC(=O)OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O IYFATESGLOUGBX-YVNJGZBMSA-N 0.000 description 1
- HVUMOYIDDBPOLL-XWVZOOPGSA-N Sorbitan monostearate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O HVUMOYIDDBPOLL-XWVZOOPGSA-N 0.000 description 1
- 239000004147 Sorbitan trioleate Substances 0.000 description 1
- PRXRUNOAOLTIEF-ADSICKODSA-N Sorbitan trioleate Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)OC[C@@H](OC(=O)CCCCCCC\C=C/CCCCCCCC)[C@H]1OC[C@H](O)[C@H]1OC(=O)CCCCCCC\C=C/CCCCCCCC PRXRUNOAOLTIEF-ADSICKODSA-N 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- NCHJGQKLPRTMAO-XWVZOOPGSA-N [(2R)-2-[(2R,3R,4S)-3,4-dihydroxyoxolan-2-yl]-2-hydroxyethyl] 16-methylheptadecanoate Chemical compound CC(C)CCCCCCCCCCCCCCC(=O)OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O NCHJGQKLPRTMAO-XWVZOOPGSA-N 0.000 description 1
- NVANJYGRGNEULT-BDZGGURLSA-N [(3s,4r,5r)-4-hexadecanoyloxy-5-[(1r)-1-hexadecanoyloxy-2-hydroxyethyl]oxolan-3-yl] hexadecanoate Chemical compound CCCCCCCCCCCCCCCC(=O)O[C@H](CO)[C@H]1OC[C@H](OC(=O)CCCCCCCCCCCCCCC)[C@H]1OC(=O)CCCCCCCCCCCCCCC NVANJYGRGNEULT-BDZGGURLSA-N 0.000 description 1
- YDONNITUKPKTIG-UHFFFAOYSA-N [Nitrilotris(methylene)]trisphosphonic acid Chemical class OP(O)(=O)CN(CP(O)(O)=O)CP(O)(O)=O YDONNITUKPKTIG-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 150000007933 aliphatic carboxylic acids Chemical class 0.000 description 1
- 150000008044 alkali metal hydroxides Chemical class 0.000 description 1
- 229910052910 alkali metal silicate Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 229910001420 alkaline earth metal ion Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 239000003945 anionic surfactant Substances 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 238000004061 bleaching Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 235000012206 bottled water Nutrition 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 239000001506 calcium phosphate Substances 0.000 description 1
- 235000011010 calcium phosphates Nutrition 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 229940021722 caseins Drugs 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 239000002738 chelating agent Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 150000001860 citric acid derivatives Chemical class 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 235000019864 coconut oil Nutrition 0.000 description 1
- 239000003240 coconut oil Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 239000013530 defoamer Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- LQZZUXJYWNFBMV-UHFFFAOYSA-N dodecan-1-ol Chemical compound CCCCCCCCCCCCO LQZZUXJYWNFBMV-UHFFFAOYSA-N 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 230000002255 enzymatic effect Effects 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 238000007046 ethoxylation reaction Methods 0.000 description 1
- 229920001038 ethylene copolymer Polymers 0.000 description 1
- 229940071087 ethylenediamine disuccinate Drugs 0.000 description 1
- 239000003925 fat Substances 0.000 description 1
- 235000019197 fats Nutrition 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 238000005194 fractionation Methods 0.000 description 1
- 239000013538 functional additive Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 125000001165 hydrophobic group Chemical group 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229940029339 inulin Drugs 0.000 description 1
- 239000011344 liquid material Substances 0.000 description 1
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L magnesium chloride Substances [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 1
- 229910001629 magnesium chloride Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 150000004682 monohydrates Chemical class 0.000 description 1
- 229940043348 myristyl alcohol Drugs 0.000 description 1
- WQEPLUUGTLDZJY-UHFFFAOYSA-N n-Pentadecanoic acid Natural products CCCCCCCCCCCCCCC(O)=O WQEPLUUGTLDZJY-UHFFFAOYSA-N 0.000 description 1
- 125000001971 neopentyl group Chemical group [H]C([*])([H])C(C([H])([H])[H])(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 229940055577 oleyl alcohol Drugs 0.000 description 1
- XMLQWXUVTXCDDL-UHFFFAOYSA-N oleyl alcohol Natural products CCCCCCC=CCCCCCCCCCCO XMLQWXUVTXCDDL-UHFFFAOYSA-N 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 125000000962 organic group Chemical group 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- UEZVMMHDMIWARA-UHFFFAOYSA-M phosphonate Chemical compound [O-]P(=O)=O UEZVMMHDMIWARA-UHFFFAOYSA-M 0.000 description 1
- 229920002503 polyoxyethylene-polyoxypropylene Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 235000011118 potassium hydroxide Nutrition 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 229940024999 proteolytic enzymes for treatment of wounds and ulcers Drugs 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 239000003352 sequestering agent Substances 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229940045872 sodium percarbonate Drugs 0.000 description 1
- SZHIIIPPJJXYRY-UHFFFAOYSA-M sodium;2-methylprop-2-ene-1-sulfonate Chemical compound [Na+].CC(=C)CS([O-])(=O)=O SZHIIIPPJJXYRY-UHFFFAOYSA-M 0.000 description 1
- MNCGMVDMOKPCSQ-UHFFFAOYSA-M sodium;2-phenylethenesulfonate Chemical compound [Na+].[O-]S(=O)(=O)C=CC1=CC=CC=C1 MNCGMVDMOKPCSQ-UHFFFAOYSA-M 0.000 description 1
- MWNQXXOSWHCCOZ-UHFFFAOYSA-L sodium;oxido carbonate Chemical compound [Na+].[O-]OC([O-])=O MWNQXXOSWHCCOZ-UHFFFAOYSA-L 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 229940035044 sorbitan monolaurate Drugs 0.000 description 1
- 239000001593 sorbitan monooleate Substances 0.000 description 1
- 235000011069 sorbitan monooleate Nutrition 0.000 description 1
- 229940035049 sorbitan monooleate Drugs 0.000 description 1
- 235000011071 sorbitan monopalmitate Nutrition 0.000 description 1
- 239000001570 sorbitan monopalmitate Substances 0.000 description 1
- 229940031953 sorbitan monopalmitate Drugs 0.000 description 1
- 239000001587 sorbitan monostearate Substances 0.000 description 1
- 235000011076 sorbitan monostearate Nutrition 0.000 description 1
- 229940035048 sorbitan monostearate Drugs 0.000 description 1
- 235000019337 sorbitan trioleate Nutrition 0.000 description 1
- 229960000391 sorbitan trioleate Drugs 0.000 description 1
- 238000001694 spray drying Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
- TUNFSRHWOTWDNC-HKGQFRNVSA-N tetradecanoic acid Chemical compound CCCCCCCCCCCCC[14C](O)=O TUNFSRHWOTWDNC-HKGQFRNVSA-N 0.000 description 1
- ZKWDCFPLNQTHSH-UHFFFAOYSA-N tribromoisocyanuric acid Chemical class BrN1C(=O)N(Br)C(=O)N(Br)C1=O ZKWDCFPLNQTHSH-UHFFFAOYSA-N 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- GDJZZWYLFXAGFH-UHFFFAOYSA-M xylenesulfonate group Chemical group C1(C(C=CC=C1)C)(C)S(=O)(=O)[O-] GDJZZWYLFXAGFH-UHFFFAOYSA-M 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
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
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/66—Non-ionic compounds
- C11D1/72—Ethers of polyoxyalkylene glycols
- C11D1/721—End blocked ethers
-
- 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
- C11D11/00—Special methods for preparing compositions containing mixtures of detergents ; Methods for using cleaning compositions
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L15/00—Washing or rinsing machines for crockery or tableware
- A47L15/42—Details
- A47L15/46—Devices for the automatic control of the different phases of cleaning ; Controlling devices
-
- 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
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/66—Non-ionic compounds
- C11D1/722—Ethers of polyoxyalkylene glycols having mixed oxyalkylene groups; Polyalkoxylated fatty alcohols or polyalkoxylated alkylaryl alcohols with mixed oxyalkylele groups
-
- 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
- C11D17/00—Detergent materials or soaps characterised by their shape or physical properties
- C11D17/0047—Detergents in the form of bars or tablets
- C11D17/0052—Cast detergent compositions
-
- 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
- C11D17/00—Detergent materials or soaps characterised by their shape or physical properties
- C11D17/0047—Detergents in the form of bars or tablets
- C11D17/0065—Solid detergents containing builders
- C11D17/0073—Tablets
-
- 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
- C11D3/16—Organic compounds
- C11D3/37—Polymers
- C11D3/3746—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C11D3/3769—(Co)polymerised monomers containing nitrogen, e.g. carbonamides, nitriles or amines
- C11D3/3776—Heterocyclic compounds, e.g. lactam
-
- C11D2111/14—
-
- C11D2111/42—
Definitions
- Warewashing system containing low levels of surfactant
- This invention relates to an institutional or industrial warewashing detergent and to its use in automatic warewashing machines that operate with a wash and a rinse cycle.
- the detergent of the invention promotes soil removal in the washing stage and rinsing or rinse water sheeting in the rinsing stage.
- the detergent includes a low level of surfactant in the wash stage and obviates the dosage of a surfactant in the rinse stage.
- Step 1 which is a main wash, in which the substrates are cleaned by pumping main wash solution over the substrates via nozzles.
- This main wash solution is obtained by dissolving main wash detergent, which can contain components such as alkalinity agents, builders, bleaches, enzymes, surfactants for defoaming or cleaning, polymers, corrosion inhibitors etc.
- Step 2 is a rinse step after the main wash.. This is done by flowing warm or hot water, contaning rinse aid solution, over the substrates, which can be followed by a hot air stream to further improve the drying process .
- the rinse aid typically consists of non-ionics present in an amount of 10 to 30% in water; often in combination with hydrotropes and sometimes other additives such as polymers, silicones, acids, etc.
- a number of machines are used for these institutional warewash processes, such as the so called single tank, dump or multi-tank machines. Typical conditions in these institutional warewash processes are: A. Constant temperature of main wash in a single tank and dump machines of 50 - 70 0 C.
- Temperature of wash solution in multi-tank machine is about 4O 0 C in the first (prewash) tank and about 60 0 C in the last wash tank.
- the substrates have to be dry after the final rinse, since this is a more or less continuous batch process where the substrates are cleared away before the next batch of washed and dried substrates are coming out of the machine .
- These machines are used at facilities (like restaurants, hospitals, cantines) where many substrates are washed in a short period of time.
- Part of the wash solution is carried over into the rinse solution :(e.g. via the same pump, tubes and nozzles that are used for washing and rinsing and because the rinse solution is recirculated through the wash tank during rinsing) .
- Temperature in domestic wash process is totally different; normally cold water is used for filling the machines. This water is heated up to about 60 degrees C during the wash process .
- E. Volume wash solution is about 3 to 10 Liter.
- Crucial parameters / conditions for obtaining acceptable drying properties by this so called built-in rinse concept in domestic dishwashing machines are: A. Carry-over of some part of the main wash solution, containing the drying ingredients, into the rinse solution.
- This carry-over typically takes place via the same pump, tubes and nozzles that are used for washing and rinsing and because the rinse solution is recirculated through the wash tank with dish ware during rinsing.
- Institutional warewashing processes are characterised by very short wash and rinse cycles, i.e. by a very shore contact time between the wash solution and the substrates and between the rinse solution and the substrates.
- institutional high temperature single- and multi-tank machines there is no carry-over of the wash solution via the pump, tubes and nozzles of the machine and no carry-over by adsorption and subsequent desorption via the machine walls (since the rinse solution is not recirculated in the wash tank) . Therefore, the concept of built-in rinse components is not expected to work in institutional warewashing processes.
- reduced drying times are much more important for institutional warewashing processes than for domestic dishwashing, where emphasis is on visual appearance.
- the concentration of the nonionic sheeting agent in the aqueous rinse commonly is about 20 to 40 parts by weight or more per million parts of the aqueous rinse if the alkaline detergent material contains greater than about 25 wt % of the nonionic sheeting agent.
- a method of washing ware using a cleaning composition containing a surfactant which involves contacting ware in a washing step with an aqueous cleaning composition in an automatic institutional warewashing machine.
- the aqueous cleaning composition contains a major portion of an aqueous diluent and about 200 to 5000 parts by weight of a warewashing detergent per each one million parts of the aqueous diluent.
- the detergent contains a surfactant present in an amount not ⁇ to exceed 15 wt-%.
- the washed ware is contacted in a rinse step with a potable aqueous rinse.
- the aqueous rinse is substantially free of an intentionally added rinse agent. Preferably, no rinse agent is intentionally added to the potable aqueous rinse.
- the warewashing detergent contains sufficient adsorbing surfactant to provide a layer of surfactant on the ware so as to afford sheeting action in the potable aqueous rinse step.. ⁇
- the washing step preferably does not exceed 10 minutes, more preferably does not exceed 5 minutes.
- the aqueous rinse step preferably .does ' not exceed 2 minutes. ⁇ •
- a surfactant that • is suitable for use in the warewashing detergent should be low foaming in the institutional warewashing process and should sufficiently adsorb on a solid surface leading to overall reduced drying times .
- a preferred surfactant is selected from the group consisting of nonionic surfactants and polymeric surfactants.
- a preferred nonionic surfactant is a compound obtained by the condensation of alkylene oxide groups with an organic hydrophobic material which may be aliphatic or alkyl aromatic in nature, preferably is a compound selected from the group consisting of a C2-C18 alcohol alkoxylate having EO, PO, BO and PEO moieties or a polyalkylene oxide block copolymer.
- a preferred polymeric surfactant is a homo- or copolymeric polycarboxylic acid or polycarboxylate.
- Suitable polymeric polycarboxylic compounds are (meth) acrylic acid homopolymers , copolymers of acrylic and/or methacrylic acid with maleic acid and/or copolymers of maleic acid with olefins .
- the surfactant is adsorbed onto the ware during the washing step with a subsequent lowering of the contact angle of rinse water contacting the surface of the ware, leading to reduced thickness of the rinsewater film and so resulting in sheeting action. This results in faster drying of the substrates when rinsed with fresh water.
- a single cank warewash machine is employed which is operated at a temperature of between 50- 60°C in the washing step and about 80-90 0 C in the rinse step.
- ware is washed in an automatic institutional warewashing machine which for instance can be a single tank or a multi-tank machine.
- an automatic institutional warewashing machine which for instance can be a single tank or a multi-tank machine.
- the following ⁇ materials can be employed.
- a surfactant that is suitable for use in the method • of the invention should be low foaming in the institutional warewashing process and should sufficiently adsorb on a solid ⁇ surface leading to overall improved drying behaviour .(reduced drying time) .
- a surfactant that is suitable for use in the method of the invention provides an improved drying behaviour corresponding to the ratio
- the concentration of the tested surfactant typically is 4 to 8 wt% in the detergent composition. Care should be taken to choose such test conditions that provide proper differences in drying behaviour with and without surfactant. For instance, those conditions are suitable that give a proper difference in drying time when comparing a process with a common rinse aid added to the rinse water with a process using detergent without surfactant and a rinse step with fresh water. Typical drying times for such processes may be about 2 and about 4 minutes, respectively. Suitable conditions are for instance those of examples 1, 2 or 8.
- a common rinse aid may be a nonionic surfactant dosed at about 100 ppm in the rinse water, for instance Rinse Aid A (see example 1) .
- the detergent composition that may be used for this comparison typically contains metasilicate, phosphate and hypochlorite, e.g. 0.4g/l sodium tripoly phosphate (STP; LV 7 ex-Rhodia) + 0.285g/l sodium metasilicate Oaq (SMS 0 aq.) + 0.285g/l sodium metasilicates 5aq (SMS 5aq.) + 0.03g/l dichloroisocyanuric acid Na-salt 2aq (NaDCCA) .
- STP sodium tripoly phosphate
- S 0 aq. sodium metasilicate Oaq
- S 5aq. sodium metasilicates 5aq
- NaDCCA dichloroisocyanuric acid Na-salt 2aq
- Nonionic surfactants are nonionic surfactants which can be broadly defined as surface active compounds with one or more uncharged hydrophilic substituents.
- a major class of nonionic surfactants are those compounds produced by the condensation of alkylene oxide groups with an organic hydrophobic material which may be aliphatic or alkyl aromatic in nature. The length of the hydrophilic or polyoxyalkylene radical which is condensed with any particular hydrophobic group can be readily adjusted to yield a water-soluble compound having the desired degree of balance between hydrophilic and hydrophobic elements.
- Illustrative, but not limiting examples, of various suitable nonionic surfactant types are mentioned below.
- C2-C18 alcohol alkoxylate having EO, PO, BO and PEO moieties or a polyalkylene oxide block copolymer.
- Suitable carboxylic acids include "coconut” fatty acids (derived from coconut oil) which contain an average of about 12 carbon atoms, “tallow” fatty acids (derived from tallow-class fats) which contain an average of about 18 carbon atoms, palmitic acid, myristic acid, stearic acid and lauric acid.
- Polyoxyalkene condensates of aliphatic alcohols whether linear- or branched-chain and unsaturated or saturated, especially ethoxylated and/or propoxylated aliphatic alcohols containing from about 6 to about 24 carbon atoms and incorporating from about 2 to about 50 ethylene oxide and/or propylene oxide units .
- Suitable alcohols include "coconut” fatty alcohol, "tallow” fatty alcohol, lauryl alcohol, myristyl alcohol and oleyl alcohol.
- Ethoxylated fatty alcohols may be used alone or in admixture with anionic surfactants.
- Rn is from 6 to 20 carbon atoms.
- group R 11 may have chain lengths in a range from 9 to 18 carbon atoms .
- the average value of n should be at least 2.
- the numbers of ethylene oxide residues may be a statistical distribution around the average value. However, as is known, the distribution can be affected by the manufacturing processor altered by fractionation after ethoxylation.
- Examples are ethoxylated fatty alcohols having a group R 11 which has 9 to 18 carbon atoms while n is from 2 to 8.
- Other example types of nonionic surfactants are linear fatty alcohol alkoxylates with a capped terminal group, as described in U.S. Pat. No. 4,340,766 to BASF.
- R 12 is a C 5 -C 24 linear or branched alkyl hydrocarbon radical and q is a number from 2 to 50; more preferably R 12 is a C 8 -C 13 linear alkyl mixture and q is a number from 2 to 15.
- R 12 is a C 5 -C 24 linear or branched alkyl hydrocarbon radical and q is a number from 2 to 50; more preferably R 12 is a C 8 -C 13 linear alkyl mixture and q is a number from 2 to 15.
- Polyoxyethylene or polyoxypropylene condensates of alkyl phenols, whether linear- or branched-chain and unsaturated or saturated, containing from about 6 to 12 carbon atoms and incorporating from about 2 to about 25 moles of ethylene oxide and/or propylene oxide.
- Polyoxyethylene derivatives of sorbitan mono-, di-, and tri-fatty acid esters wherein the fatty acid component has between about 12 and about 24 carbon atoms are of sorbitan monolaurate, sorbitan trilaurate, sorbitan monopalmitate, sorbitan tripalmitate, sorbitan monostearate, sorbitan monoisostearate, sorbital tristearate, sorbitan monooleate, and sorbitan trioleate.
- the polyoxyethylene chains may contain between about 4 and about 30 ethylene oxide units, preferably about 10 to about 20.
- the sorbitan ester derivatives contain 1, 2 or 3 polyoxyethylene chains dependent upon whether they are mono-, di- or tri-acid esters .
- Polyoxyethylene-polyoxypropylene block copolymers having formula: HO(CH 2 CH 2 0) a (CH(CH 3 )CH 2 0) b (CH 2 CH 2 O) c H or
- the polyoxyethylene component of the block polymer constitutes at least about 10% of the block polymer.
- the material can for instance have a molecular weight of between about 1,000 and about 15,000, more specifically from about 1,500 to about 6,000. These materials are well- known in the art.. They are available under the trademark
- .Preferred polymeric surfactants are homo- or copolymeric polycarboxylic acids or polycarboxylates, for example those having a molecular weight in the range from 800 to 150,000.
- Suitable polymeric polycarboxylic compounds are (meth) acrylic acid homopolymers, copolymers of acrylic and/or methacrylic acid with vinyl .monomers like styrene or maleic anhydride and/or copolymers of maleic acid with olefins.
- Suitable acrylic polymers are those sold under r he trade mark Sokalan PA by BASF or Alcosperse by Alco.
- Suitable copolymers of (meth) acrylic acid with other vinyl monomers are acrylic/maleic acid copolymers such as sold by BASF under the trademark Sokalan or sold by Alco under the trademark of Alcosperse, Narlex and Versaflex.
- maleic acid/olefin copolymers having having the formula
- L 1 is selected frown the group of hydrogen, ammonium or an alkali metal; and R 1 , R 2 , R 3 and R 4 are each independently selected from the group of hydrogen or an alkyl group (straight or branched, saturated or unsaturated) containing from 1 to about 8 carbon atoms, preferably from 1 to about 5 carbon atoms.
- the monomer ratio of x to y is from about 1:5 to about 5:1, preferably from about 1:3 to about 3:1, and most preferably from 1.5:1 to about 1:1.5.
- the average molecular weight of the copolymer will typically be less than about
- a preferred maleic acid-olefin copolymer is a maleic acid-di-isobutylene copolymer having an average molecular weight of about 12,000 and a monomer ratio (x to y) of about 1:1.
- Such a copolymer is available from the BASF Corporation under the trademark "Sokalan CP-9".
- L 1 is hydrogen or sodium
- R 1 and R 3 are hydrogen
- R 2 is methyl
- R 4 is neopentyl
- Another preferred product is a maleic acid-trimethyl isobutylene ethylene copolymer.
- L 1 is hydrogen or sodium
- R 3 and R 1 are each methyl
- R 2 is hydrogen and R 4 is tertiary butyl .
- copolymers are especially preferred when interacting with 2+ or 3+ positively charged metal ions, like calcium (Ca 2+ ), magnesium (Mg 2+ ) ions or aluminium (Al 3+ ) , in the wash solution.
- 2+ or 3+ positively charged metal ions like calcium (Ca 2+ ), magnesium (Mg 2+ ) ions or aluminium (Al 3+ )
- These ions could be present as water hardness minerals in tap water, or could for instance be added to the wash solution together with these copolymers. It is found that the combination of these copolymers with these 2+ / 3+ metal ions is especially effective in the concept of built in rinse for institutional warewashing as described herein.
- Another preferred polymeric surfactant is based on pyrrolidone, such as Poly Vinyl Pyrrolidones (PVP) .
- PVP Poly Vinyl Pyrrolidones
- Another preferred polymeric surfactant is a polyhydroxyamide .
- polymeric surfactants are found in the group of polypeptides. Especially preferred are caseins.
- Another preferred polymeric surfactant is found in the group of hydrophobically modified polysaccharides, such as a hydrophobically modified inulin.
- Patty alcohol alkoxylates such as Adekanol B2020 (Adeka) , Dehypon LS36 (Cognis) , Plurafac LF 221 (C13-15, EO/BO (95%)), Plurafac LF 300, Plurafac LF 303 (EO/PO) , Plurafac LF 1300, Degressal SD 20 (polypropoxylate) (all from BASF) , Surfonic LF 17 (C12-18 ethoxylated propoxylated alcohol, Huntsman) , Triton EF 24 (Dow) ;
- Alkoxypolyethylbenzylethers such as Triton DF 12 or DF18
- Acrylic acid homopolymers such as Alcosperse 602 TG (acrylic acid homopolymer, Mw 6000, Alco) , Sokalan PA40 (polyacrylic acid, Na-salt, Mw 15000) , Sokalan PA15 (polyacrylic acid, sodium salt, Mw 1200) (BASF);
- Copolymers such as Sokalan CP9 (maleic acid / olefin- copolymer, Na-salt, Mw 12000) , Sokalan CP5 (maleic acid / acrylic acid copolymer, Na-salt, Mw 70000) , Sokalan PM 70 (modified polycarboxylate, Na salt, Mw 20000 (BASF) , Versaflex SI (acrylic copolymer) , Alcosperse 175 (maleic / acrylic acid copolymer, Mw 75000) ,. Narlex LD 36V (acrylic acid copolymer, Mw 5000) , Narlex LD 54 (acrylic acid copolymer, Mw 5000) . (Alco) ;
- Polymeric pyrollidones such as Surfadone LP-100 (N-Octyl-2- Pyrrolidone, ISP) or polyvinylpyrrolidones such as PVP K-30, PVP K-60, PVP K-90, PVP K-120 (ISP); • Polyhydroxyamides such as Anticor A 40 (ADD APT Chemicals BV) ;
- Hydrophobically modified polysaccharides such as a hydrophobically modified in ⁇ lin (Inutec SP 1, Orafti BBC) .
- surfactants can be used alone or in combination in the detergent composition.
- Preferred combinations are for instance Sokalan CP9 and Degressal SD 20; Plurafac LP 1300 and Sokalan CP9,- Plurafac LF 300 and Degressal SD 20 and Sokalan CP 5; Plurafac LF 300 and Degressal SD 20 and Sokalan PA 40; Plurafac LF 300 and Degressal SD 20 and Versaflex SI; Plurafac LF 300 and Degressal SD 20 and Alcosperse 175; Plurafac LF 300 and Degressal SD 20 and Narlex LD 54.
- the preferred concentration range of surfactant is from about 0.5 to about 15% by wt . , more preferably from about 0.5 to about 10% by weight, most preferably from about 3 to about 7% by weight of the detergent composition.
- compositions may be formulated as detergent compositions having conventional ingredients, preferably selected from alkalinity sources, builders (i.e. detergency builders including -the class of chelating agents/sequestering agents) , bleaching systems, anti-sealants, corrosion inhibitors, antifoams and enzymes.
- Suitable caustic agents include alkali metal hydroxides, e.g. sodium or potassium hydroxides, and alkali metal silicates, e.g. sodium metasilicate.
- sodium silicate having a mole ratio of SiO 2 :Na 2 O of from about 1.0 to about 3.3, preferably from about 1.8 to about 2.2, normally referred to as sodium disilicate.
- Suitable builder materials are well known in the art . and many types of organic and inorganic compounds have been described in the literature. They are normally used in all sorts of cleaning compositions to provide alkalinity and buffering capacity, prevent flocculation, maintain ionic strength, extract metals from soils and/or remove alkaline earth metal ions from washing solutions .
- the builder material usable herein can be any one or mixtures of the various known phosphate and non-phosphate builder materials.
- suitable non-phosphate builder materials are the alkali metal citrates, carbonates and bicarbonates; and the salts of nitrilotriacetic acid (NTA) ; methylglycine diacetic acid (MGDA) ; polycarboxylates such as polymaleates, polyacetates, polyhydroxyacrylates, polyacrylate/polymaleate and polyacrylate/polymethacrylate copolymers, as well as zeolites; layered silicas and mixtures thereof. They may be present (in % by wt ⁇ , Jn the ranqe of from 1 to 70, and preferably from 5 to 60, moie piefeiana./ from 10 to 60.
- Particularly preferred builders are phosphates, NTA,
- EDTA EDTA
- MGDA citrates
- carbonates bicarbonates
- polyacrylate/polymaleate polyacrylate/polymaleate
- maleic anhydride/ (meth) acrylic acid copolymers e.g. Sokalan CP5 available from BASF.
- Scale formation on dishes and machine parts can be a significant problem. It can arise from a number of sources but, primarily it results from precipitation of either alkaline earth metal carbonates, phosphates or silicates. Calcium carbonate and phosphates are the most significant problem. To reduce this problem, ingredients to minimize scale formation can be incorporated into the composition. These include polyacrylates of molecular weight from 1,000 to 400,000 examples of which are supplied by Rohm & Haas, BASF and Alco Corp. and polymers based on acrylic acid combined with other moieties.
- acrylic acid combined with maleic acid, such as Sokalan CP5 and CP7 supplied by BASF or Acusol 479N supplied by Rohm & Haas,- with methacrylic acid such as Colloid 226/35 supplied by Rhone-Poulenc; with phosphonate such as Casi 773 supplied by Buckman Laboratories; with maleic acid and vinyl acetate such as polymers supplied by HuIs; with acrylamide,- with sulfophenol methallyl ether such as Aquatreat AR 540 supplied by Alco; with 2-acrylamido- 2-methylpropane sulfonic acid such as Acumer 3100 supplied by Rohm & Haas or such as K-775 supplied by Goodrich; with 2- acrylamido-2-methylpropane sulfonic acid and sodium styrene sulfonate such as K-798 supplied by Goodrich; with methyl methacrylate, sodium methallyl sulfonate and sulfophenol methally
- Bleaches Suitable bleaches for use in the system according the present invention may be halogen-based bleaches or oxygen- based bleaches. More than one kind of bleach may be used.
- alkali metal hypochlorite may be used as halogen bleach.
- Other suitable halogen bleaches are alkali metal salts of di- and tri-chloro and di- and tri-bromo cyanuric acids.
- Suitable oxygen-based bleaches are the peroxygen bleaches, such as sodium perborate (tetra- or monohydrate) , sodium carbonate or hydrogen peroxide.
- hypochlorite, di-chloro cyanuric acid and sodium perborate or percarbonate preferably do not exceed 15%, and 25% by weight, respectively, e.g. from 1-10% and from 4-25% and by weight, respectively.
- Amylolytic and/or proteolytic enzymes would normally be used as an enzymatic .component.
- the amylolytic enzymes usable herein can be those derived from bacteria or fungi .
- Minor amounts of various other components may be present in the chemical cleaning system. These include solvents,- and hydrotropes such as ethanol, isopropanol and xylene sulfonates, flow control agents,- enzyme stabilizing agents; anti-redeposition agents; corrosion inhibitors; and other functional additives.
- Components of the present invention may independently be formulated in the form of solids (optionally to be dissolved before use) , aqueous liquids or non-aqueous liquid (optionally to be diluted before use) .
- the warewashing detergent may be in the form of a ⁇ liquid or a powder.
- the powder may be a granular powder.
- a flow aid may be present to provide good flow properties and to prevent lump formation of the powder.
- the detergent preferably may be in the form of a tablet or a solid block.
- the detergent may be a combination of powder and tablet in a sachet, to provide a unit dose for several washes .
- Typical institutional ware washing processes are either continuous or non-continuous and are conducted in either a single tank or a multi-tank/conveyor type machine.
- pre-wash, wash, post-rinse and drying zones are generally established using partitions. Wash water is introduced into the rinsing zone and is passed cascade fashion back towards the pre-wash zone while the dirty dishware is transported in a counter-current direction.
- the inventive chemical cleaning system may be utilized in any of the conventional automatic institutional ware washing processes .
- the surfactant, incorporated in the wash detergent can be in a liquid form, but also in. solid form.
- the .stability of the surfactant in the wash . detergent can be improved in several ways in order to prevent chemical reaction with other .components from the ware washing - detergent (like caustic, hypochlorite) .
- Some options are: A. Absorbing the surfactant in a porous material before mixing with the other warewashing components; e.g. absorbing in sodium tripolyphoshate, sodium sulfate, sodium carbonate, sodium metasilicate, sodium disilicate, bentonite or other type of clay.
- B Incorporating the surfactant in a granule with another material in a granulation process ( ⁇ co-granulation' ) ; e.g. spray drying during granulation of sodium ⁇ tripolyphoshate, sodium sulfate, soda ash, NTA.
- C Encapsulating the surfactant or the absorbed or co- granulated surfactant by another material (e.g. by starch, polymer or sodium carbonate) before mixing with the other warewashing components .
- C. ..Proper drying of a variety of substrates can be obtained by certain polymeric surfactants individually and by combining certain non-ionics with certain polymers in the main • wash solution: see example IG and example 8.
- Some polymeric surfactants e.g. maleic acid / olefin copolymers such as Sokalan CP9 will also provide proper drying on a variety of substrates, without the presence of nonionic surfactants.
- the drying properties are optimal when the maleic acid / olefin copolymer is combined with polyvalent cations in the wash solution: see example 9.
- a defoaming type of nonionic surfactant can be present to prevent foam formation.
- the improved drying properties can also be obtained with certain end-capped non-ionics. These end-capped non- ionics provide better stability in combination with components like caustic and chlorine.
- test IA the drying behaviour of this process with a standard rinse process is determined. In this standard rinse process a rinse aid is dosed in the separate rinse.
- test IB the drying behaviour is determined for a wash process in which no rinse components are present (not dosed via the separate rinse and not added to the main wash process) .
- the warewasher is a Hobart-single tank hood machine, which is automated for laboratory testing, such that the hood is opened and closed automatically and the rack with ware is transported automatically into and out off the machine.
- Specifications single tank hood machine (for example 1) Type: Hobart AUX70E Volume washbath: 5OL Volume rinse: IL (2 seconds) Wash time: 30 seconds Rinse time: 2 seconds Wash temperature: 50-55°C Rinse temperature: 80 °C Process
- the wash program is started.
- the washwater will be circulated in the machine by the internal wash pump and the wash arms over the dishware.
- the wash pump will stop and the wash water will stay in the reservoir below the substrates.
- 4L of the wash bath will be drained automatically by a pump into the drain.
- the rinse time is over the machine is opened.
- the parameters for this test are set (wash cycle: 30seconds at 5O 0 C, rinse cycle: 2 seconds at 80 0 C with fresh water) and once the machine is filled with soft cold water and temperature of water is 50 0 C, the main wash powder (and surfactant to be tested) are added via a plate on the rack.
- One wash cycle is done to be sure that the product is t-otally dissolved.
- Main wash powder is: 0.6g/l sodium tripoly phosphate (STP; LV 7 ex-Rhodia) + 0.37g/l sodium hydroxide (WaOH) + 0.03g/l dichloroisocyanuric acid Na-salt . 2aq (NaDCCA) . Drying times are measured on 6 different types of substrates :
- the wash cycle 40 seconds
- rinse cycle 2 seconds with fresh water
- the timer starts as soon as the warewasher starts with opening the hood.
- the door is opened, the top of the plastic and ceramic cups are dried, and the drying time (in seconds) of the washed substrates at ambient temperature are determined.
- the substrates are replaced for every new series of tests (in order not to influence the drying results by components possibly adsorbed onto- the ware) .
- the substrates are ceramic plates (1) , ceramic cups (2) , glass bowls (3), plastic trays, (4) , cutlery (5) and pale blue cups (6) .
- Test IA Reference test for standard dish wash process In this reference test the drying effects are measured for a representative standard institutional dish wash process in which drying of the ware is obtained by rinsing with a rinse solution in which rinse aid is dosed.
- rinse components are dosed via a separate rinse pump just before the boiler into the last rinse water. Three wash cycles are done before the test starts, in order to be sure that the rinse aid is homogenously distributed through the boiler.
- Rinse Aid A is used as representative rinse aid for institutional warewashing.
- This neutral rinse aid contains about 30 % of a non-ionic mixture. By dosing this rinse aid at a level of 0.4 g/L, the concentration of non- ionics in. the rinse solution is about 120 ppm.
- Test 1 B Reference test without the presence of specially added drying components
- test 1 C, I D, I E and IF show that the presence of relatively low levels of certain non-ionics (like in these examples Adekanol B2020, Plurafac LF 303, mixture of Pluarafac LF 303 with LF 221 or Surfonic LF 17) in the main wash reduces the drying times on various substrates enormously as compared to the test without rinse components (test IB) . These drying times are especially reduced for the following substrates: ceramic cup, plastic trays, cutlery and pale blue cups. Without rinse components, these substrates are drying very slowly (test IB) . The drying times of these most difficult to dry and very relevant substrates are reduced significantly by the presence of low levels of mentioned non- ionics.
- non-ionics like in these examples Adekanol B2020, Plurafac LF 303, mixture of Pluarafac LF 303 with LF 221 or Surfonic LF 17
- the warewasher used for these test series is an Electrolux Wash Tech 60 single tank machine.
- Specifications single tank hood machine (for example 2) : Type: Electrolux Wash Tech 60 Volume washbath: 4OL Volume rinse : 4L Wash time: 60 seconds Rinse time: 8 seconds Wash temperature: 55- 65°C Rinse temperature: 80-90 0 C Process
- the wash program When the wash bath is filled with soft water and heated up, the wash program is started. The water will be circulated in the machine by the internal wash pump and by the wash arms over the dishware. When the wash time is over, the wash pump will stop. Then the rinse program will start, fresh warm water from the boiler (directly connected to a tap) will be rinsed by the rinse arms over the dishware. The rinse water will flow partly direct into the drain by an overflow pipe, the other part will flow into the wash bath. When the rinse time is over the .machine is opened. ⁇
- a wash system in which no rinse component is present and is rinsed with fresh water.
- a reference test for a representative standard institutional dish wash process in which drying of the ware is obtained by rinsing with a rinse solution in which rinse aid is dosed. These rinse components are dosed via a separate rinse pump just before the boiler into the last rinse water. Three wash cycles are done before the test starts, in order to be sure that the rinse aid is homogenously distributed through the boiler.
- Rinse Aid A is used as representative rinse aid for institutional warewashing. This neutral rinse aid contains 30 % of a non-ionic mixture. By dosing this rinse aid at a level of 0.2 g/L, the concentration of non-ionics in the rinse solution is 60 ppm.
- C A wash system in which 20 ppm of a mixture of 2 nonionics (Plurafac LF 303 and LF 221) is added into the main wash process and where is rinsed with fresh water.
- the substrates are ceramic plates (1), ceramic cups (2), glass bowls(3), plastic trays (4) , cutlery(5) and pale blue cups(6).
- Test 4 A Test with no rinse components and no rinse cycle In this test, the drying times are measured for a wash process, without dosing rinse components neither rinsing with fresh water (parameter of rinse cycle: 0 sec)
- Test 4 B Test in which surfactant is added in the main wash process, and without rinse cycle
- Test 4 C, D, E, F Test in which surfactant is present in the main wash process and rinsed with fresh water only, with various rinse times
- the drying M T ⁇ s nr° ⁇ - -.-, . ;> f «1 for a similar wash process as described under test 4 B, so adding 50ppm of Triton EF24 as a surfactant together with the other main wash components, but now a rinse cycle of a certain duration is applied.
- the rinsing is done with fresh water only.
- wash cycle 30 seconds at 50 0 C
- rinse cycle 2 seconds at 80 0 C with fresh water (IL)
- IL fresh water
- test 5A the drying behaviour of this process with a standard rinse process is determined.
- a rinse aid is dosed in the separate rinse.
- test 5B the drying behaviour is determined for a wash process in which no rinse components are present (not dosed via the separate rinse and not added to the main wash process) .
- tests 5 C up to 5 G the drying behaviour is determined for various wash processes in which no rinse component is dosed in the separate rinsed (so rinsed only with fresh water) but where different type of surfactants are added to the main wash together with the other main wash components .
- surfactants are:
- the substrates are ceramic plates (1) , ceramic cups (2), glass bowls(3), plastic trays(4) arid cutlery(5).
- Test 5 A Reference test for standard warewash process In this reference test the drying effects are measured for a representative standard institutional warewash process in which drying of the ware is obtained by rinsing with a rinse solution in which rinse aid is dosed. These rinse components are dosed via a separate rinsepump just before the boiler into the last rinse water. Three wash cycles are done before the test starts, in order to be sure that the rinse aid is homogenously distributed through the boiler.
- Rinse Aid A is used as • representative rinse aid for institutional warewashing.
- This neutral rinse aid contains about 30 % of a non-ionic mixture.
- the concentiacion or anionics in the rinse solution is about 120 ppm.
- the principle of the DFR (ml/s) determination is that a known volume of powder is permitted to flow through an orifice and the flow time is recorded.
- a glass tube of 50 cm length and 3.5 cm internal diameter is used for the determination.
- a brass orifice with a diameter of 2.25 cm and a metal slide for blocking the bottom of the tube are used.
- the 2.25 cm diameter orifice is fitted to the tube.
- the orifice is closed with the metal slide and the tube is filled with the powder to be tested..
- the orifice is opened and the stopwatch started when the powder passes the upper graduation ' mark.
- the stopwatch is " stopped when the powder passes the. lower graduation mark and the elapsed time is noted. This is repeated twice more.
- the mean flow rate is calculated from the volume between the two marks and the time and reported in ml/sec.
- the determined DFR-values for the 4 test products are given in the table.
- Formulation A represents a standard granulated warewash product for institutional warewash machines. This test product with a DFR-value of 125 ml/s has proper flow properties, does not lump, and can be dosed automatically into the machine. In general, a DFR-value above 100 ml/s implicates a free flowing powder.
- Formulation B in which 5% of the sodium tripolyphosphate is replaced by 5% of nonionic (Triton EF-24) has no free flowing properties at all under these conditions.
- the DFR-value is 0.
- the flow aids used in these test products are Aerosil 200 and Neosyl GP; silicone dioxide, raw materials with a very high active surface.
- test method contact angle measurement Contact angle measurements were carried out using an FTA 200 (First Ten Angstroms) -apparatus .- The Drop Shape Method was applied during the measurements. For these tests flat pieces from the following substrates were used: glass, plastic tray and cutlery.
- composition see example 2 composition see example 2
- the temperature of this ⁇ wash solution' was 60 0 C. After 40 seconds the substrates were taken out of this solution and shaken to remove attached water and to let it dry. The contact angle was measured on these substrates by the Drop Shape Method, as follows :
- a drop (20 ⁇ l of) soft water detaches from the dispensing needle and rests on a substrate as a ⁇ sessile' , or sitting drop.
- the drop touches the s ⁇ bst raf.e rhe ⁇ r . / ⁇ •- is clicked by the user.
- the contact angle is measured automatically by taking images at certain intervals.
- Adekanol B2020, Triton EF 24, Triton DF 12, Plurafac LF 303 Adekanol B2020, Triton EF 24, Triton DF 12, Plurafac LF 303.
- nonionics were selected because they resulted into faster drying of these substrates when present in a wash solution of an institutional wash process when rinsing with water only.
- a reference test is done in which no nonionic is present, but only the alkaline wash solution LX. Contact angles of water measured after 20 seconds on 3 different type of substrates for 5 different wash solutions
- test 8A the drying behaviour of the substrates is determined for a standard rinse process.
- a rinse aid is dosed via a separate rinse pump just before the boiler into the last rinse water.
- Rinse Aid A is used as representative rinse aid for institutional warewashing (details: see- example 1).
- test 8B Reference
- the drying behaviour of che substrates is determined for a wash process in which no rinse components are present (not dosed via the separate rinse and not added to the main wash process) .
- the mainwash contains only the main wash powder (metasilicate, phosphate and hypochlorite) and the rinse is done with fresh water.
- tests 8C to 8R the drying behaviour is determined for various wash processes in which no rinse component is dosed in the separate rinsed (so rinsed only with fresh water) but where different surfactants are added to the main wash together with the other main wash components .
- the materials used as surfactant are:
- Rinse time 8 seconds Wash temperature: 5O 0 C Rinse temperature: 80 0 C
- Main wash powder is: 0.4g/l sodium tripoly phosphate (STP; LV 7 ex-Rhodia) + 0.285g/l sodium metasilicate Oaq (SMS 0 aq.) + 0.285g/l sodium metasilicates 5aq (SMS 5aq.) + 0.03g/l dichloroisocyanuric acid Na-salt 2aq (NaDCCA). Drying times are measured on 3 different types of substrates. These are coupons, which are difficult to dry in a institutional warewash process without rinse components and made of the following, practically relevant, materials:
- the drying time is determined (in seconds) of the washed substrates at ambient temperature. When drying time is longer than 300s, it is reported as 300s. However, the plastic coupons are often not dried within five minutes. In that case, the remaining droplets on the coupons are counted. • The wash cycle and drying time measurements are repeated two more times with the same substrates without adding any chemicals. The substrates are replaced for every new test (in order not to influence the drying results by components possibly adsorbed onto the ware) . Results
- Test 8A confirms the effects of rinse components in the last rinse, which is current standard. The use of the standard process with the separate rinse aid leads to proper drying on all 3 substrates.
- Test 8B shows that relatively long drying times or many water droplets on plastic are obtained when no rinse aid is used in the wash process .
- Test 8C to 8R show that the presence of various surfactants at relatively low levels in the main wash can reduce drying times on stainless steel or glass, or number of water droplets on plastic significantly. Some of these drying behaviours are comparable or even better than for using a separate rinse aid.
- One of the. best surfactants in these examples is provided by test 8N, consisting of a combination of Sokalan CP9 and Degressal SD20. Degressal SD 20 is also present in this composition as defoamer to prevent foam formation in a wash process with high mechanical forces.
- test 80 and 8P the effect of each of these components is tested separately. These tests show that especially the presence of the polymeric surfactant Sokalan CP9 in the main wash leads to excellent drying behaviour under these conditions, where is rinsed with fresh tap water only.
- the main wash process contains phosphate, caustic and hypochlorite.
- no rinse component is dosed in the separate rinse so the substrates are rinsed only with fresh water.
- test 9A the drying behavior of the substrates are determined for a wash process in which no rinse components are present (not dosed via the separate rinse and not added to the main wash process) .
- tap water is used and the mainwash contains only the main wash powder (phosphate, caustic and hypochlorite) .
- test 9B to 9E 40 ppm Degressal SD20 and 20 ppm Sokalan CP9. Furthermore, in these tests the impact of water hardness and addition of positively charged metal ions like calcium (Ca 2+ ) and magnesium (Mg 2+ ) ions are tested.
- composition of the main wash powder in this example is: 0.6g/l sodium tripoly phosphate (STP; LV 7 ex-Rhodia) + 0.37g/l caustic (NaOH) + 0.03g/l dichloroisocyanuric acid Na-salt 2aq (NaDCCA) .
- the reference test (9A) has also been done with soft water and the use of magnesium and calcium chloride in soft water (same conditions as in tests 9C to 9E without the surfactant in the main wash) . In each case, the results for the reference are comparable to what is obtained in tap water (test 9A) .
- Test 9A shows that relatively long drying times or many water droplets on plastic are obtained when no rinse components are used in the wash process .
- Test 9B shows that the surfactant containing Sokalan CP9 and Degressal SD20 improves the drying behavior on all substrates in tap water: this results is in line with the effect measured , in example 8N for a different main . wash composition.
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008510096A JP5265349B2 (en) | 2005-05-04 | 2006-05-02 | Dishwashing system containing low concentrations of surfactant |
MX2007013748A MX2007013748A (en) | 2005-05-04 | 2006-05-02 | Warewashing system containing low levels of surfactant. |
KR1020077028173A KR101329837B1 (en) | 2005-05-04 | 2006-05-02 | Warewashing system containing low levels of surfactant |
BRPI0611300A BRPI0611300B1 (en) | 2005-05-04 | 2006-05-02 | dishwashing method using a cleaning composition containing a surfactant |
AU2006242305A AU2006242305B2 (en) | 2005-05-04 | 2006-05-02 | Warewashing system containing low levels of surfactant |
CN200680018912.5A CN101189324B (en) | 2005-05-04 | 2006-05-02 | Warewashing system containing low levels of surfactant |
CA2606817A CA2606817C (en) | 2005-05-04 | 2006-05-02 | Warewashing system containing low levels of surfactant |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US67761905P | 2005-05-04 | 2005-05-04 | |
EP05103745 | 2005-05-04 | ||
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US (1) | US8876982B2 (en) |
JP (2) | JP5265349B2 (en) |
KR (1) | KR101329837B1 (en) |
CN (1) | CN101189324B (en) |
AU (1) | AU2006242305B2 (en) |
CA (1) | CA2606817C (en) |
MX (1) | MX2007013748A (en) |
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Also Published As
Publication number | Publication date |
---|---|
JP2013039389A (en) | 2013-02-28 |
CA2606817A1 (en) | 2006-11-09 |
KR101329837B1 (en) | 2013-11-14 |
CN101189324A (en) | 2008-05-28 |
KR20090018877A (en) | 2009-02-24 |
AU2006242305A1 (en) | 2006-11-09 |
JP2009501554A (en) | 2009-01-22 |
US8876982B2 (en) | 2014-11-04 |
JP5265349B2 (en) | 2013-08-14 |
AU2006242305B2 (en) | 2011-10-27 |
CN101189324B (en) | 2015-03-11 |
CA2606817C (en) | 2013-10-22 |
US20070017553A1 (en) | 2007-01-25 |
MX2007013748A (en) | 2008-01-28 |
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