CN102493235A - Method for improving dyeing performance of dead cotton - Google Patents
Method for improving dyeing performance of dead cotton Download PDFInfo
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- CN102493235A CN102493235A CN2011104043657A CN201110404365A CN102493235A CN 102493235 A CN102493235 A CN 102493235A CN 2011104043657 A CN2011104043657 A CN 2011104043657A CN 201110404365 A CN201110404365 A CN 201110404365A CN 102493235 A CN102493235 A CN 102493235A
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Abstract
The invention relates to a method for improving the dyeing performance of dead cotton by adopting a lyophilization method for modification. The method comprises the following main process steps of swelling treatment on the dead cotton with hot water, filtering, freezing at low temperature and lyophilizing. Air gaps are formed inside dead cotton fibers modified with the method disclosed by the invention, so that the adsorption performance of the modified dead cotton to the dye can be improved and further the dyeing performance is improved.
Description
Technical field
The present invention relates to a kind of cotton fiber modification method, especially relate to a kind of method of modifying that improves dyeing ability of dead cotton.Belong to natural fabric modification technology field.
Background technology
Freeze drying (abbreviation freeze-drying) is exactly the material that contains large quantity of moisture; Lower the temperature in advance and be frozen into solid; Under the condition of vacuum, make water vapour directly from solid, distil then, and material itself is stayed in ice shelf that freezes, thereby made dried product keep its original form.In cryodesiccated process, the solid composition is being supported by the black ice on its seat, when the ice distillation; To in the surplus materials of drying, stay hole, therefore, the material after the freeze drying is loose porous; Be spongy, add suction rapidly behind the water, almost recover original proterties immediately; Be that rehydration is good, and traditional drying means can cause the material shrinkage, destroy cell.At present, freeze drying technology is used widely in food service industry.
Maturity of cotton fiber and cotton fibre quality have substantial connection.Maturity of cotton fiber is meant the thickening degree of fiber cell wall, and the cotton fiber cell wall is thicker, and maturity better.The Cotton Fiber Strength of normal mature is high, and it is many to change song, and color is pure white, and gloss is bright, high resilience, and cohesive force is big between fiber, and yarn quality is good, and dyeability is good; The unmature cotton fiber is thinner, and intensity is low, and color stagnates white, and gloss is dim, lacks flexibility, and moisture absorption is fast, and regain is high, often is prone to adhere to more field trash, and easy fracture during spinning is second-rate; Extremely immature cotton fiber is commonly called as " dead cotton "; Be meant the dead cotton that cotton boll produces because of hypoplasia in growth course, fiber cell wall very thin (its thickness be equal to or less than fiber Breadth Maximum 1/5) does not have and changes bent or seldom change bent; REACTIVE DYES are not almost had affinity, and dyeability is very poor.Contain the COTTON FABRIC of dead cotton or in dyeing processing, be easy to cause cloth cover to have some diffusive white stars with cotton blending, the fabric that interweaves; Especially dark product such as some peonys, purple, coffee color, dark blue, black is particularly evident, has a strong impact on the product quality and the percentage of A-class goods.The maturity of cotton fiber and growth conditions, cotton variety are relevant, and it is bigger influenced by growth conditions.The researcher has done a lot of researchs to reducing, cover the stained clot-h colourless star fault that causes because of dead cotton; Research is to screen suitable dyestuff emphatically and dyes, improves dyeing and adopt that suitable dyestuff carries out that fault is remedied etc.; Propose before direct dyeing, the fabric that contains dead cotton to be handled like patent of invention (CN88105451A) with cationic auxiliary; To improve the dyeability of dead cotton, make dyestuff improve 2～4 grades to the covering power of dead cotton.
Summary of the invention
The present invention is intended to adopt the freeze drying technology of physics that dead cotton fiber is carried out modification, to improve the dyeability of dead cotton fiber.
For achieving the above object, the modified technique flow process that the present invention adopts is following: dead cotton → hot water treatment → filtration → cryogenic freezing → freeze-drying.
Each step concrete grammar and the effect as follows:
The first step: the hot water swollen is handled
Adopt 60 ℃ of-80 ℃ of warm water, dead cotton is carried out the hot water swollen handle processing time 30-60min;
Second step: filter
Adopt 40-80 order metallic sieve to filter, can reuse through the water of screen cloth;
The 3rd step: cryogenic freezing
The dead cotton that will pass through hot water treatment and contain adequate water places temperature to be-the freezing cotton till death all hardening of ultra low temperature freezer refrigerating chamber of 25--80 ℃;
The 4th step: freeze-drying
Adopt the vacuum freeze-drying machine that the dead cotton of freezing is fully carried out freeze-drying and handle, vacuum is-50 ℃ less than 20Pa, temperature in freeze-drying process.Adopt freeze drying technology dried rather than traditional oven dry or air-dry, the space that in hot water swollen, refrigerating process, forms with the dead cotton fiber of abundant maintenance, thus improve absorption property and the tinting strength, tinting power of dead cotton fiber to dyestuff.
The specific embodiment
A kind of method specific embodiment 1 that improves dyeing ability of dead cotton:
The first step: the hot water swollen is handled
Adopt 80 ℃ of warm water, dead cotton is carried out the hot water swollen handle processing time 30min;
Second step: filter
Adopt 80 order metallic sieves to filter, can reuse through the water of screen cloth;
The 3rd step: cryogenic freezing
It is-80 ℃ freezing cotton till death all hardening of ultra low temperature freezer refrigerating chamber that the dead cotton that will pass through hot water treatment and contain adequate water places temperature;
The 4th step: freeze-drying
Adopt the vacuum freeze-drying machine that the dead cotton of freezing is fully carried out freeze-drying and handle, vacuum is-50 ℃ less than 20Pa, temperature in freeze-drying process.
A kind of method specific embodiment 2 that improves dyeing ability of dead cotton:
The first step: the hot water swollen is handled
Adopt 60 ℃ of warm water, dead cotton is carried out the hot water swollen handle processing time 60min;
Second step: filter
Adopt 40 order metallic sieves to filter, can reuse through the water of screen cloth;
The 3rd step: cryogenic freezing
It is-25 freezing cotton till death all hardening of ultra low temperature freezer refrigerating chamber that the dead cotton that will pass through hot water treatment and contain adequate water places temperature;
The 4th step: freeze-drying
Adopt the vacuum freeze-drying machine that the dead cotton of freezing is fully carried out freeze-drying and handle, vacuum is-50 ℃ less than 20Pa, temperature in freeze-drying process.
Claims (1)
1. method that adopts freeze drying process that dead cotton fiber is carried out modification, to improve the dyeability of dead cotton, the main processing step of this method is: dead cotton → hot water treatment → filtration → cryogenic freezing → freeze-drying; More than the concrete characteristic of each step following:
The first step: the hot water swollen is handled
Adopt 60 ℃ of-80 ℃ of warm water, dead cotton is carried out the hot water swollen handle processing time 30-60min;
Second step: filter
Adopt 40-80 order metallic sieve to filter, can reuse through the water of screen cloth;
The 3rd step: cryogenic freezing
To handle and the dead cotton that contains adequate water places temperature to be-the freezing cotton till death all hardening of ultra low temperature freezer refrigerating chamber of 25--80 ℃ through the superheated water swollen;
The 4th step: freeze-drying
Adopt the vacuum freeze-drying machine that the dead cotton of freezing is fully carried out freeze-drying and handle, vacuum is-50 ℃ less than 20Pa, temperature in freeze-drying process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104043657A CN102493235A (en) | 2011-12-08 | 2011-12-08 | Method for improving dyeing performance of dead cotton |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104043657A CN102493235A (en) | 2011-12-08 | 2011-12-08 | Method for improving dyeing performance of dead cotton |
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| Publication Number | Publication Date |
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| CN102493235A true CN102493235A (en) | 2012-06-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN2011104043657A Pending CN102493235A (en) | 2011-12-08 | 2011-12-08 | Method for improving dyeing performance of dead cotton |
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| CN (1) | CN102493235A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105113204A (en) * | 2015-08-11 | 2015-12-02 | 西安工程大学 | Dyeing treatment method for jute fibers |
| CN106367542A (en) * | 2016-08-29 | 2017-02-01 | 浙江通天星集团股份有限公司 | Manufacturing process for embossed leather |
| CN115726202A (en) * | 2022-11-21 | 2023-03-03 | 泉州联兴发针织织造有限公司 | Production and preparation process of plant-dyed nylon fabric |
-
2011
- 2011-12-08 CN CN2011104043657A patent/CN102493235A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105113204A (en) * | 2015-08-11 | 2015-12-02 | 西安工程大学 | Dyeing treatment method for jute fibers |
| CN106367542A (en) * | 2016-08-29 | 2017-02-01 | 浙江通天星集团股份有限公司 | Manufacturing process for embossed leather |
| CN106367542B (en) * | 2016-08-29 | 2019-04-12 | 浙江通天星集团股份有限公司 | The manufacture craft of embossing leather |
| CN115726202A (en) * | 2022-11-21 | 2023-03-03 | 泉州联兴发针织织造有限公司 | Production and preparation process of plant-dyed nylon fabric |
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Application publication date: 20120613 |