US2222526A - Method of dye stripping - Google Patents
Method of dye stripping Download PDFInfo
- Publication number
- US2222526A US2222526A US31523A US3152335A US2222526A US 2222526 A US2222526 A US 2222526A US 31523 A US31523 A US 31523A US 3152335 A US3152335 A US 3152335A US 2222526 A US2222526 A US 2222526A
- Authority
- US
- United States
- Prior art keywords
- dye
- formaldehyde
- stripper
- generator
- stripping
- 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 - Lifetime
Links
- 238000000034 method Methods 0.000 title description 5
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 19
- 239000000975 dye Substances 0.000 description 7
- 239000000984 vat dye Substances 0.000 description 5
- 239000004744 fabric Substances 0.000 description 4
- COHYTHOBJLSHDF-UHFFFAOYSA-N indigo powder Natural products N1C2=CC=CC=C2C(=O)C1=C1C(=O)C2=CC=CC=C2N1 COHYTHOBJLSHDF-UHFFFAOYSA-N 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 241001062009 Indigofera Species 0.000 description 3
- 235000000177 Indigofera tinctoria Nutrition 0.000 description 3
- 238000009835 boiling Methods 0.000 description 3
- 229940097275 indigo Drugs 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- WDHSSYCZNMQRNF-UHFFFAOYSA-L ctk1a4617 Chemical compound [Zn+2].O=C.[O-]S[O-] WDHSSYCZNMQRNF-UHFFFAOYSA-L 0.000 description 2
- 125000002485 formyl group Chemical class [H]C(*)=O 0.000 description 2
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 description 2
- 235000019345 sodium thiosulphate Nutrition 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- BGJSXRVXTHVRSN-UHFFFAOYSA-N 1,3,5-trioxane Chemical group C1OCOCO1 BGJSXRVXTHVRSN-UHFFFAOYSA-N 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 244000283207 Indigofera tinctoria Species 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000004755 animal textile Substances 0.000 description 1
- YYRMJZQKEFZXMX-UHFFFAOYSA-L calcium bis(dihydrogenphosphate) Chemical compound [Ca+2].OP(O)([O-])=O.OP(O)([O-])=O YYRMJZQKEFZXMX-UHFFFAOYSA-L 0.000 description 1
- 239000001506 calcium phosphate Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 239000007859 condensation product Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 125000004836 hexamethylene group Chemical group [H]C([H])([*:2])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[*:1] 0.000 description 1
- COHYTHOBJLSHDF-BUHFOSPRSA-N indigo dye Chemical compound N\1C2=CC=CC=C2C(=O)C/1=C1/C(=O)C2=CC=CC=C2N1 COHYTHOBJLSHDF-BUHFOSPRSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- 229910000150 monocalcium phosphate Inorganic materials 0.000 description 1
- 235000019691 monocalcium phosphate Nutrition 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- AGGKEGLBGGJEBZ-UHFFFAOYSA-N tetramethylenedisulfotetramine Chemical compound C1N(S2(=O)=O)CN3S(=O)(=O)N1CN2C3 AGGKEGLBGGJEBZ-UHFFFAOYSA-N 0.000 description 1
- JOUDBUYBGJYFFP-FOCLMDBBSA-N thioindigo Chemical compound S\1C2=CC=CC=C2C(=O)C/1=C1/C(=O)C2=CC=CC=C2S1 JOUDBUYBGJYFFP-FOCLMDBBSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
- D06P1/22—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using vat dyestuffs including indigo
- D06P1/228—Indigo
Definitions
- vat dyes upon such vat dyes is to produce a color of less intensity or even white while in the stripping bath, but the leuco base so produced is oxidized almost immediately on contact with air, with consequent production of the original color or one approaching it.
- vat dyes are indigo and the common indigo derivatives.
- the invention will be primarily discussed with reference to indigo, for the sake of simplicity, but it is not to be understood that the invention is limited thereto.
- vat dyes are reduced to a substantially less colored form, and are then fixed in this form in such a manner that they are not altered in color on contact with air.
- any desired reducing. dye-stripper of the ordinary types may be employed, those dye-strippers known as the sulfur" type being most commonly employed.
- other reducing strippers such as zinc dust and the like may be employed.
- the preferred dye-stripper is set forthin my co-pending appli cation, Serial No. 737,313 filed July 24, 1934, Patent Number 2,046,317 patented July 7, 1936.
- This stripper comprises basic zinc sulfoxylate-formaldehyde, sodium hyposulfite and sodium bisulfite as reducing agents, and monocalclum phosphate as a catalyst. In its preferred proportions the stripper comprises:
- the fixing agent is preferably a generator of formaldehyde.
- an acidic aldehyde generator such as trioxymethylene. ably in the ratio of about one to two percent by weight, in powderedform to the bath, and the boilingis then continued for an additional period.
- the fabric may be removed and the dye will not be oxidized in air.
- the boiling with the formaldehyde generator is not essential, but does accelerate and improve the action.
- the fabric may be allowed to remain in contact with a warm or even cool solution containing an aldehyde with fairly satisfactoryresults.
- the percentages of stripper, and likewise .the percentages of the formaldehyde generator will vary widely with various dye stuffs This substance is added, prefer-- and fabrics. Normally, the range of percentage of the formaldehyde generator will be from onehalf to ten percent.
- an alkaline formaldehyde generator such as hexamethylene' tetramine.
- the method of stripping an indigo dye which comprises treating the dye with reducing dye stripper of the sulfur type to produce a less colored reduced product, and heating the reduced product with formaldehyde to produce an airstable product.
- the method of decolorizing a vat dye which comprises treating said dye with a reducing dye stripper to produce a less colored reduced form thereof, and adding to a bath containing the reduccd form formaldehyde, whereby an air-stable product is produced.
Description
Patented Nov. 19, 1940 UNITED STATES PATENT orrlcr:
METHOD OF DYE STBII'EING David Julian Block, Wlnnetka, 111., assignor to Hobart M. Cable No Drawing. Application my 15, 1935, Serial No. 31,523
3 Claims.
' upon such vat dyes is to produce a color of less intensity or even white while in the stripping bath, but the leuco base so produced is oxidized almost immediately on contact with air, with consequent production of the original color or one approaching it.
The commonest of the vat dyes are indigo and the common indigo derivatives. The invention will be primarily discussed with reference to indigo, for the sake of simplicity, but it is not to be understood that the invention is limited thereto.
By means of this invention, the vat dyes are reduced to a substantially less colored form, and are then fixed in this form in such a manner that they are not altered in color on contact with air.
In carrying out the invention, any desired reducing. dye-stripper of the ordinary types may be employed, those dye-strippers known as the sulfur" type being most commonly employed. However, other reducing stripperssuch as zinc dust and the like may be employed. The preferred dye-stripper is set forthin my co-pending appli cation, Serial No. 737,313 filed July 24, 1934, Patent Number 2,046,317 patented July 7, 1936. This stripper comprises basic zinc sulfoxylate-formaldehyde, sodium hyposulfite and sodium bisulfite as reducing agents, and monocalclum phosphate as a catalyst. In its preferred proportions the stripper comprises:
Parts 'Monocalcium phosphate Basic zinc sulfoxylate-formaldehyde 2 Sodium hyposulfite 2 Sodium bisulfl-t 1 ter, the solid constituents being stirred slowly intov the water. The dyed fabric is then immersed in the solution, and the latter brought slowly to the boiling point with intermittent stirring. The boiling is continued for a period of about fifteen minutes, and then a daring agent is added to the solution.
The fixing agent is preferably a generator of formaldehyde. In those instances where the bath is of an acidic nature, such as is used for W001, silk and animal fabrics, it is preferred to use an acidic aldehyde generator such as trioxymethylene. ably in the ratio of about one to two percent by weight, in powderedform to the bath, and the boilingis then continued for an additional period.
of about ten minutes. Following this treatment, the fabric may be removed and the dye will not be oxidized in air.
The boiling with the formaldehyde generator is not essential, but does accelerate and improve the action. However, the fabric may be allowed to remain in contact with a warm or even cool solution containing an aldehyde with fairly satisfactoryresults. The percentages of stripper, and likewise .the percentages of the formaldehyde generator will vary widely with various dye stuffs This substance is added, prefer-- and fabrics. Normally, the range of percentage of the formaldehyde generator will be from onehalf to ten percent.
When an alkaline bath is used, as is customary with cotton goods and with certain types of vat colors such as thioindigo red, it is preferred to use an alkaline formaldehyde generator such as hexamethylene' tetramine.
The mechanism of the fixing operation is not understood. It is believed that the formaldehyde forms a stable condensation product with some reduced form of the vat dye.
The foregoing description has been given for clearness of understanding only, and no unnecessary limitations should be understood therefrom, but the appended claims should be construed as broadly as permissible, in view of the prior art.
What I claim as new and desire to secure by Letters Patent is:
1. The method of stripping an indigo dye which comprises treating the dye with reducing dye stripper of the sulfur type to produce a less colored reduced product, and heating the reduced product with formaldehyde to produce an airstable product.
2. The method of decolorizing a vat dye which comprises treating said dye with a reducing dye stripper to produce a less colored reduced form thereof, and adding to a bath containing the reduccd form formaldehyde, whereby an air-stable product is produced.
3. The method as set forth in claim the dye is an indigo derivative.
2, in which
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US31523A US2222526A (en) | 1935-07-15 | 1935-07-15 | Method of dye stripping |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US31523A US2222526A (en) | 1935-07-15 | 1935-07-15 | Method of dye stripping |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2222526A true US2222526A (en) | 1940-11-19 |
Family
ID=21859932
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US31523A Expired - Lifetime US2222526A (en) | 1935-07-15 | 1935-07-15 | Method of dye stripping |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2222526A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2508713A (en) * | 1946-10-07 | 1950-05-23 | Harris Res Lab | Treatment of keratinous material |
-
1935
- 1935-07-15 US US31523A patent/US2222526A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2508713A (en) * | 1946-10-07 | 1950-05-23 | Harris Res Lab | Treatment of keratinous material |
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