CA1051617A - Non-caking laundry sour - Google Patents
Non-caking laundry sourInfo
- Publication number
- CA1051617A CA1051617A CA217,063A CA217063A CA1051617A CA 1051617 A CA1051617 A CA 1051617A CA 217063 A CA217063 A CA 217063A CA 1051617 A CA1051617 A CA 1051617A
- Authority
- CA
- Canada
- Prior art keywords
- caking
- sodium
- laundry
- sour
- weight
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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Abstract
NON-CAKING LAUNDRY SOUR
Frank Xavier Koepfle Herbert Edward Grote ABSTRACT
Fluoride-containing laundry sours are rendered non-caking by the incorporation of anhydrous calcium sulfate or certain other anti-caking materials.
Frank Xavier Koepfle Herbert Edward Grote ABSTRACT
Fluoride-containing laundry sours are rendered non-caking by the incorporation of anhydrous calcium sulfate or certain other anti-caking materials.
Description
BACICG_OU~ O~_T~-IE IN~-rrIoN
: 5 Field of the Invention This invention pertains to compositions of matter useful as laundry sour products.
Descri~ion of the Prior Art Numerous steps in the processing of textiles involve contacting the textiles with various chemical compounds such as bleaching, dyeing, and washing compounds. At the conclusion of each step it is necessary that alkaline residues be removed from the textile fabrics before the next processing step. So, too, in laundering operations it has been found desirable to remove the residual soaps or synthetic detergents remaining on the laundered fabrics. Residue removal in both circumstances is commonly accomplished by contacting the fabrics with an aqueous solution of a composition exhibiting an acid r~action. These compositions are hereinafter referred to as laundry sours. Over 20 the years, numerous acid materials have been used in compound- :
ing laundry sourS . Today,~the most commvnly used materials are ...,~
~05~6~L7 sodium silicofluoride (Na2Si F6), sodium bi~luoride (sodium acid fluoride, NaF-~-lF), and mixtures of the two. A common mixture will contain 75% by weight sodium silicofluoride and 25% by weight sodium bifluoride. In addition to the fluoride salts, additives are sometimes used in sour compositions. Very cor~mon additives are optical bleaches wllich are referred to in the art as brighteners. A common brightener level is ~1% of the total fluoride salt content.
While the above-described fluoride salt mixtures ade-~uately perform the desired souring function, com~ercial ex-perience has demonstrated that the mixtures exhibit undesirable caking properties. m at is, when the mixtures are stored in drums under unfavorable conditions of temperature and humidity, such as are frequently encountered in textile processing plants and co~nercial laundries, they exhibit a tendency to form hard lumps, cakes,and chunks. This caking tendency, while not inter-fering with the souring action once the product has been added to the souring bath, causes inconvenience to the oFerators of the textile plants and the commercial laundries in that the em-ployees of these establishments must spend time breaking upthe cakes and lumps in order to remove the ~aundry sour from its container and in order to dissolve the composition in the souring bath. There has long ~een felt a need in the textile processing and commercial laundry industries for a laundry sour 25 composition which will be available at the time of its use in the form of a free flowing powder. Certain additives, such as magnesium oxide, have been proposed for reducing the caXiny tendency of laundry sours, but deficiencies in terms of per-, ~ .................... ....
S~6~7 formance and cost have rendered them less than completelysatisfactory.
It is an object of this invention to provide a fluoride-containing laundry sou:r which remains free flowing even after storage for extended periods in drums under adverse conditions of tempe.rature and humidity.
SUMMARY OF THE INVENTION
According to the present invention there is provided a non-caking laundry sour composition which comprises sodium silicofluoride; sodium bifluoride; anhydrous calcium sulfate; wherein the weight ratio of sodium silico-fluoride to sodium bifluoride is 3:1 and wherein the calcium sulfate is present at from 0.3 to 1% by weight of ; the total fluoride salt content.
DESCRIPTION OF THE PREFERRED EMBODIMENTS .
The fluoride salt-containing laundry sour ~ .
contemplated for use in this invention is composed of one or more of the common water-soluble fluoride salts used in laundry sours. Examples of such fluoride salts are :
sodium silicofluoride, zinc silicofluoride, ammonium : silicofluoride, sodium bifluoride, and ammonium bifluoride.
A preferred laundry sour composition is composed of sodium silicofluoride and sodium bifluoride in a weight ratio of sodium silicofluoride to sodium bifluoride of . . .
3 .. ...
. . . - : . -' , : .: ''' ' , ~ : .' . :, .. :
1~51617 1:1 to 5:1. A highly preferred laundry sour is composed of sodium silicofluoride and sodium bifluoride in a weiyht ratio of 3:10 While anhydrous calcium sulfate has been found to be the most highly preferred anti-caking material for addition to fluoride salt-containing laundry ~ours, other chemicals have been shown to be effective anti-caking agents. rTIIese other materials are anhydrous calcium chloride, anhydrous magnesiuln sulfate, anhydrous sodium dibasic phosphate and calcium tri-basic phosphate. Each of these materials is used at levels offrom 0.1 to 1.5% by weight of the total fluoride salt comp~nent of the laundry sour composition, preferably at levels of from 0.3 to l.~/o by weiyht of the total fluoride salt component.
Brighteners, such as disodium 4,4'~bis(4-morpholino-~-anilino-s-triazine-2-yl-amino)~2,2'-stilbene disulfonate, may optionally be used in the laundry sour at from 0.01 to 0.5% by weight of the total fluoride salts present. The pre-ferred level of brightener is 0.1~ by weight of the total fluoride salt present.
To maXe the non-caking laundry sours of this invention, the dry, powdered ingredients are intimately blended by hand or in a mechanical mixer such as a V-cone mixer or an intern-ally baffled rotating drum mixer. In a preferred method of making a preferred non-caking laundry sour (i.e. one con-taining sodium silicofluoride and sodium bifluoride in a weight ratio of 1:1 to 5:1) the appropriate amount of anti-caking material is in~i~a~ely blended Witll the sodium bifluoride com-~,.,;,~, ,..
.. , .~ ~ ~,.
~516~
ponent and this mixtu,-e is then intimately b7ended ~itll the sodiwn siJicofluoride component and 'che optiona] brightener, if one is used.
The following examples illustrate thc use of this invention, but are not to be construed as in any way limiting the scope of the invention.
EX~MPLE I
One-half (0.5) pound sodium bifluoride and 0.01 pound powdered anhydrous calcium sulfatewere placed in an internally baffled rotating drum mixing apparatus. The apparatus was started and allowed to run for two minutes until an intimate mixture o the bifluoride and the calcium sulfate was obtained, The mixer was stopped and one and one-half (1.5) pounds sodium silicofluoride and 0.002 pound brightener were added. ~he apparatus was started and allowed to run 6 minutes until an intimate mixture of the ingredients was obtained. The resulting product was free-flowing even after storage at 90F. and 80% relative humidity for 5 days and it adequately performed its assigned souring task.
EXAMPLE II
The procedure of Example I is repeated except that in successive batches o souring composition, the calcium sulfate is replaced in turn by 0.01 pound of anhydrous calcium chloride, ~L~)51617 0.01 pound anhydrous magnesium sul~ate, 0.01 pound anhydrous sodium dibasic phosphate, and 0.01 pound calcium tribasic phosphate. In each case, a non-caklng laundry sour compo-sition is obtained.
EXAMPLE III
An anti-caking souring composition is prepared as in Example I except that 0.03 pound anhydrous calcium sulfate is mixed with the sodium bifluoride. ~s in Example I, the mixture exhibits a lack of caking on storage under adverse conditions of temperature and humidity and successfully and adequately performs the desired souring task.
EXAMPLE IV
Seventy-five (75) pounds of sodium silicofluoride (Na2Si F6) and twenty-five (25) pounds of sodium bifluoride (NaF-~F) are formed into an intimate mixture by blending the powdered materials. During the blending operation, 0.1 pound of brightener is added to the mixing fluoride salts. After the brightener is added, 0.5 pound powdered, anhydrous calcium sul~ate is added to the fluoride salt composition. The total laundry sour composition is blended until a uniform, intimate mixture is obtained. This souring composition demonstrates excellent anti-caking properties and adequately performs its souring ~unction.
' '.:
i~5~/617 I.aundry sour compositiolls prepared according to this invention ean contain from about 98.52% to about 99.90% by weight of a water-soluble fluoride salt seleeted from the group eonsisting of sodium silieofluoride, sodium bifluoride and mixtures thereof, and from about 0.10% to about 1.48% by weight of an anti-eaking agent selected from the group consisting of anhydrous ealcium sulfate, anhydrous caleium ehloride, anhy-drous magnesium sulfate, anhydrous sodium dibasie phosphate and ealeium tribasie phosphate. In a preferred embodiment, the laundry sour would eontain from about 99.01% to about 99.70/O
by weight fluoride salt and from about 0.30/O to about 0.99% by weight anti-eaking agent.
WHAT IS CLAIMED IS:
': ', ~; j " -";
: 5 Field of the Invention This invention pertains to compositions of matter useful as laundry sour products.
Descri~ion of the Prior Art Numerous steps in the processing of textiles involve contacting the textiles with various chemical compounds such as bleaching, dyeing, and washing compounds. At the conclusion of each step it is necessary that alkaline residues be removed from the textile fabrics before the next processing step. So, too, in laundering operations it has been found desirable to remove the residual soaps or synthetic detergents remaining on the laundered fabrics. Residue removal in both circumstances is commonly accomplished by contacting the fabrics with an aqueous solution of a composition exhibiting an acid r~action. These compositions are hereinafter referred to as laundry sours. Over 20 the years, numerous acid materials have been used in compound- :
ing laundry sourS . Today,~the most commvnly used materials are ...,~
~05~6~L7 sodium silicofluoride (Na2Si F6), sodium bi~luoride (sodium acid fluoride, NaF-~-lF), and mixtures of the two. A common mixture will contain 75% by weight sodium silicofluoride and 25% by weight sodium bifluoride. In addition to the fluoride salts, additives are sometimes used in sour compositions. Very cor~mon additives are optical bleaches wllich are referred to in the art as brighteners. A common brightener level is ~1% of the total fluoride salt content.
While the above-described fluoride salt mixtures ade-~uately perform the desired souring function, com~ercial ex-perience has demonstrated that the mixtures exhibit undesirable caking properties. m at is, when the mixtures are stored in drums under unfavorable conditions of temperature and humidity, such as are frequently encountered in textile processing plants and co~nercial laundries, they exhibit a tendency to form hard lumps, cakes,and chunks. This caking tendency, while not inter-fering with the souring action once the product has been added to the souring bath, causes inconvenience to the oFerators of the textile plants and the commercial laundries in that the em-ployees of these establishments must spend time breaking upthe cakes and lumps in order to remove the ~aundry sour from its container and in order to dissolve the composition in the souring bath. There has long ~een felt a need in the textile processing and commercial laundry industries for a laundry sour 25 composition which will be available at the time of its use in the form of a free flowing powder. Certain additives, such as magnesium oxide, have been proposed for reducing the caXiny tendency of laundry sours, but deficiencies in terms of per-, ~ .................... ....
S~6~7 formance and cost have rendered them less than completelysatisfactory.
It is an object of this invention to provide a fluoride-containing laundry sou:r which remains free flowing even after storage for extended periods in drums under adverse conditions of tempe.rature and humidity.
SUMMARY OF THE INVENTION
According to the present invention there is provided a non-caking laundry sour composition which comprises sodium silicofluoride; sodium bifluoride; anhydrous calcium sulfate; wherein the weight ratio of sodium silico-fluoride to sodium bifluoride is 3:1 and wherein the calcium sulfate is present at from 0.3 to 1% by weight of ; the total fluoride salt content.
DESCRIPTION OF THE PREFERRED EMBODIMENTS .
The fluoride salt-containing laundry sour ~ .
contemplated for use in this invention is composed of one or more of the common water-soluble fluoride salts used in laundry sours. Examples of such fluoride salts are :
sodium silicofluoride, zinc silicofluoride, ammonium : silicofluoride, sodium bifluoride, and ammonium bifluoride.
A preferred laundry sour composition is composed of sodium silicofluoride and sodium bifluoride in a weight ratio of sodium silicofluoride to sodium bifluoride of . . .
3 .. ...
. . . - : . -' , : .: ''' ' , ~ : .' . :, .. :
1~51617 1:1 to 5:1. A highly preferred laundry sour is composed of sodium silicofluoride and sodium bifluoride in a weiyht ratio of 3:10 While anhydrous calcium sulfate has been found to be the most highly preferred anti-caking material for addition to fluoride salt-containing laundry ~ours, other chemicals have been shown to be effective anti-caking agents. rTIIese other materials are anhydrous calcium chloride, anhydrous magnesiuln sulfate, anhydrous sodium dibasic phosphate and calcium tri-basic phosphate. Each of these materials is used at levels offrom 0.1 to 1.5% by weight of the total fluoride salt comp~nent of the laundry sour composition, preferably at levels of from 0.3 to l.~/o by weiyht of the total fluoride salt component.
Brighteners, such as disodium 4,4'~bis(4-morpholino-~-anilino-s-triazine-2-yl-amino)~2,2'-stilbene disulfonate, may optionally be used in the laundry sour at from 0.01 to 0.5% by weight of the total fluoride salts present. The pre-ferred level of brightener is 0.1~ by weight of the total fluoride salt present.
To maXe the non-caking laundry sours of this invention, the dry, powdered ingredients are intimately blended by hand or in a mechanical mixer such as a V-cone mixer or an intern-ally baffled rotating drum mixer. In a preferred method of making a preferred non-caking laundry sour (i.e. one con-taining sodium silicofluoride and sodium bifluoride in a weight ratio of 1:1 to 5:1) the appropriate amount of anti-caking material is in~i~a~ely blended Witll the sodium bifluoride com-~,.,;,~, ,..
.. , .~ ~ ~,.
~516~
ponent and this mixtu,-e is then intimately b7ended ~itll the sodiwn siJicofluoride component and 'che optiona] brightener, if one is used.
The following examples illustrate thc use of this invention, but are not to be construed as in any way limiting the scope of the invention.
EX~MPLE I
One-half (0.5) pound sodium bifluoride and 0.01 pound powdered anhydrous calcium sulfatewere placed in an internally baffled rotating drum mixing apparatus. The apparatus was started and allowed to run for two minutes until an intimate mixture o the bifluoride and the calcium sulfate was obtained, The mixer was stopped and one and one-half (1.5) pounds sodium silicofluoride and 0.002 pound brightener were added. ~he apparatus was started and allowed to run 6 minutes until an intimate mixture of the ingredients was obtained. The resulting product was free-flowing even after storage at 90F. and 80% relative humidity for 5 days and it adequately performed its assigned souring task.
EXAMPLE II
The procedure of Example I is repeated except that in successive batches o souring composition, the calcium sulfate is replaced in turn by 0.01 pound of anhydrous calcium chloride, ~L~)51617 0.01 pound anhydrous magnesium sul~ate, 0.01 pound anhydrous sodium dibasic phosphate, and 0.01 pound calcium tribasic phosphate. In each case, a non-caklng laundry sour compo-sition is obtained.
EXAMPLE III
An anti-caking souring composition is prepared as in Example I except that 0.03 pound anhydrous calcium sulfate is mixed with the sodium bifluoride. ~s in Example I, the mixture exhibits a lack of caking on storage under adverse conditions of temperature and humidity and successfully and adequately performs the desired souring task.
EXAMPLE IV
Seventy-five (75) pounds of sodium silicofluoride (Na2Si F6) and twenty-five (25) pounds of sodium bifluoride (NaF-~F) are formed into an intimate mixture by blending the powdered materials. During the blending operation, 0.1 pound of brightener is added to the mixing fluoride salts. After the brightener is added, 0.5 pound powdered, anhydrous calcium sul~ate is added to the fluoride salt composition. The total laundry sour composition is blended until a uniform, intimate mixture is obtained. This souring composition demonstrates excellent anti-caking properties and adequately performs its souring ~unction.
' '.:
i~5~/617 I.aundry sour compositiolls prepared according to this invention ean contain from about 98.52% to about 99.90% by weight of a water-soluble fluoride salt seleeted from the group eonsisting of sodium silieofluoride, sodium bifluoride and mixtures thereof, and from about 0.10% to about 1.48% by weight of an anti-eaking agent selected from the group consisting of anhydrous ealcium sulfate, anhydrous caleium ehloride, anhy-drous magnesium sulfate, anhydrous sodium dibasie phosphate and ealeium tribasie phosphate. In a preferred embodiment, the laundry sour would eontain from about 99.01% to about 99.70/O
by weight fluoride salt and from about 0.30/O to about 0.99% by weight anti-eaking agent.
WHAT IS CLAIMED IS:
': ', ~; j " -";
Claims (2)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A non-caking laundry sour composition consisting essentially of:
a. sodium silicofluoride;
b. sodium bifluoride;
c. anhydrous calcium sulfate; wherein the weight ratio of sodium silicofluoride to sodium bifluoride is 3:1 and wherein the calcium sulfate is present at from 0.3 to 1% by weight of the total fluoride salt content.
a. sodium silicofluoride;
b. sodium bifluoride;
c. anhydrous calcium sulfate; wherein the weight ratio of sodium silicofluoride to sodium bifluoride is 3:1 and wherein the calcium sulfate is present at from 0.3 to 1% by weight of the total fluoride salt content.
2. The composition of claim 1 in which the anhydrous calcium sulfate is present at 0.5% by weight of the total fluoride salt content.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA217,063A CA1051617A (en) | 1974-12-30 | 1974-12-30 | Non-caking laundry sour |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA217,063A CA1051617A (en) | 1974-12-30 | 1974-12-30 | Non-caking laundry sour |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1051617A true CA1051617A (en) | 1979-04-03 |
Family
ID=4101954
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA217,063A Expired CA1051617A (en) | 1974-12-30 | 1974-12-30 | Non-caking laundry sour |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1051617A (en) |
-
1974
- 1974-12-30 CA CA217,063A patent/CA1051617A/en not_active Expired
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