CN1250807C - New typs powder for keeping foodstaff fresh - Google Patents
New typs powder for keeping foodstaff fresh Download PDFInfo
- Publication number
- CN1250807C CN1250807C CN 200310106175 CN200310106175A CN1250807C CN 1250807 C CN1250807 C CN 1250807C CN 200310106175 CN200310106175 CN 200310106175 CN 200310106175 A CN200310106175 A CN 200310106175A CN 1250807 C CN1250807 C CN 1250807C
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- powder
- sodium hydrosulfite
- present
- dyes
- thiourea dioxide
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Abstract
The present invention relates to novel powder for keeping foodstuff fresh, which is prepared from 20 wt% to 40 wt% of thiourea dioxide (CH4N2O2S) and 60 wt% to 80 wt% of sodium chloride (NaCl). The present invention has the advantages of high stability, strong reduction capability, no heat generation by damping, no damage to human bodies, etc. The present invention is good for environmental protection, and can be widely used for coloring jeans, bleaching cotton, wool and chemical fiber, reducing reduction dyes and sulfur dyes as a reducing agent, dispersing the printing of the dyes and stripping colors for textiles and can be also used for remachining or eliminating loose colors.
Description
Technical Field
The invention relates to novel sodium hydrosulfite which is mainly usedfor dyeing denim yarn and bleaching cotton, wool and chemical fiber or used as a reducing agent of dye.
Background
The sodium hydrosulfite in the prior art is usually prepared by adding a certain amount of powdery sodium carbonate and sodium benzoate into sodium hydrosulfite and uniformly mixing the three powdery substances through mechanical stirring, for example, the manufactured sodium hydrosulfite is the case of the manufacturing method of the flame-retardant sodium hydrosulfite disclosed in the Chinese patent CN 1033667A. However, the sodium hydrosulfite has the following defects:
1. the sodium hydrosulfite is unstable, is easy to generate heat when being wetted, is easy to decompose, and is decomposed more quickly after being dissolved in water, so that the reduction capability is reduced.
2. Sodium dithionite is a carcinogen and harmful to human body.
3. The decomposition speed is high in the using process, when the temperature of the reducing liquid reaches 50 ℃, 20% of loss exists in three seconds, and when the temperature reaches 80 ℃, 50% of loss exists in three seconds, so that in actual use, in order to enable the reducing liquid to have required reducing power in a dye bath, the using amount of the sodium hydrosulfite greatly exceeds the theoretical using amount.
4. The sewage discharged after use has high pollution content, and has adverse effect on the environment.
Disclosure of Invention
The invention aims to provide novel sodium hydrosulfite which has good stability, strong reducing power, no heating when being wetted and no harm to human bodies.
The technical scheme for realizing the purpose is as follows: a novel sodium hydrosulfite comprises thiourea dioxide C4N2O2S and sodium chloride (NaCl), wherein the weight percentages of the two components are as follows: 20 to 40 percent of thiourea dioxide and 60 to 80 percent of sodium chloride.
After the technical scheme is adopted, the sodium hydrosulfite consists of thiourea dioxide and sodium chloride, and the thiourea dioxide is decomposed into urea and hyposulfuric acid with strong reducibility in an alkaline solution, so that the sodium hydrosulfite can be used for replacing common sodium hydrosulfite to be applied to vat dye dyeing, the reduction potential value reduction speed is about one fifth of that of the common sodium hydrosulfite, and the sodium chloride has the effects of a dyeing accelerant and a stabilizer, so that the sodium hydrosulfite disclosed by the invention is low in decomposition speed, good in stability, free from ignition when meeting impact and safe to store. Meanwhile, thiourea dioxide and sodium chloride are non-carcinogenic substances, are harmless to human bodies, and harmful ingredients in discharged sewage are greatly lower than those in common sodium hydrosulfite, so that the environment is protected.
Detailed Description
The present invention will be described in further detail with reference to examples.
A novel sodium hydrosulfite comprises thiourea dioxide (CH)4N2O2S) and sodium chloride (NaCl),the weight percentages of the two components are as follows: 20 to 40 percent of thiourea dioxide and 60 to 80 percent of sodium chloride.
Example one
300g of thiourea dioxide powder and 700g of sodium chloride powder are mixed and evenly stirred to prepare the sodium hydrosulfite.
Example two
250g of thiourea dioxide powder and 750g of sodium chloride powder are mixed and evenly stirred to prepare the sodium hydrosulfite.
EXAMPLE III
350g of thiourea dioxide powder and 650g of sodium chloride powder are mixed and evenly stirred to prepare the sodium hydrosulfite.
The principle of the strong reduction method of thiourea dioxide is as follows:
thiourea dioxide decomposes in alkaline solution to urea and strongly reducing hyposulphuric acid.
The sodium chloride in the novel sodium hydrosulfite can be used as an accelerating agent and a stabilizing agent, so that the stability of the sodium hydrosulfite is enhanced, and the storage of the sodium hydrosulfite is facilitated.
The novel sodium hydrosulfite is white crystalline powder, is tasteless and is easily soluble in water.
The invention can be used for denim dyeing, bleaching of cotton, wool and chemical fiber, reducing agent of vat dye and sulfur dye, printing of disperse dye, stripping of textile, and in addition, the invention can be used for reprocessing or removing floating color.
Claims (1)
1. A novel sodium hydrosulfite is characterized in that: it consists of thiourea dioxide CH4N2O2S and sodium chloride (NaCl), wherein the weight percentages of the two components are as follows: 20 to 40 percent of thiourea dioxide and 60 to 80 percent of sodium chloride.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310106175 CN1250807C (en) | 2003-10-29 | 2003-10-29 | New typs powder for keeping foodstaff fresh |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310106175 CN1250807C (en) | 2003-10-29 | 2003-10-29 | New typs powder for keeping foodstaff fresh |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1540090A CN1540090A (en) | 2004-10-27 |
| CN1250807C true CN1250807C (en) | 2006-04-12 |
Family
ID=34334005
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200310106175 Expired - Fee Related CN1250807C (en) | 2003-10-29 | 2003-10-29 | New typs powder for keeping foodstaff fresh |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1250807C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101851870B (en) * | 2009-03-31 | 2012-02-01 | 浙江华孚色纺有限公司 | Stripping finishing method of woolen dyed fabric |
| CN102454125A (en) * | 2010-10-25 | 2012-05-16 | 福建省纤维检验局 | Stripping method suitable for deep-color cashmere qualitative and quantitative process |
| CN102808339B (en) * | 2012-07-20 | 2014-05-14 | 濮阳宏业汇龙化工有限公司 | Excited state efficient reducing agent |
| CN102926186B (en) * | 2012-10-12 | 2014-05-14 | 濮阳宏业汇龙化工有限公司 | Powerful reduced powder |
| CN106120379A (en) * | 2016-07-02 | 2016-11-16 | 王�忠 | Sodium hydrosulfite accelerator used by a kind of reducing dye |
| CN109577026B (en) * | 2018-12-12 | 2020-10-30 | 濮阳宏业环保新材料股份有限公司 | Method for renovating denim garment |
| CN117738014A (en) * | 2024-01-05 | 2024-03-22 | 广东职业技术学院 | Environment-friendly sulfur dye composite reducing agent and application thereof |
-
2003
- 2003-10-29 CN CN 200310106175 patent/CN1250807C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1540090A (en) | 2004-10-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060412 Termination date: 20091130 |