CN1587491A - Method for treating ramie fabric by super critical CO2 fluid - Google Patents
Method for treating ramie fabric by super critical CO2 fluid Download PDFInfo
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- CN1587491A CN1587491A CN 200410080840 CN200410080840A CN1587491A CN 1587491 A CN1587491 A CN 1587491A CN 200410080840 CN200410080840 CN 200410080840 CN 200410080840 A CN200410080840 A CN 200410080840A CN 1587491 A CN1587491 A CN 1587491A
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Abstract
The supercritical CO2 fluid treating process for ramie fabric includes placing the ramie fabric in supercritical CO2 fluid treating apparatus and treating at 80-140 deg.c and 20-35 MPa for 20-60 min. The present invention utilizes the solvent characteristic of supercritical CO2 fluid and alters and controls the solvent characteristic of supercritical CO2 fluid via changing the temperature and the pressure, so as to eliminate impurity in ramie fiber and raise the quality of ramie fiber product. The present invention has greatly reduced assistant amount, and adopts environment protecting supercritical CO2 fluid technology to replace traditional high temperature strong alkali treating technology of ramie fiber fabric.
Description
One, technical field
The invention relates to a kind of method of handling ramie fabric, more particularly about a kind of supercritical CO of using
2The method of fluid treatment ramie fabric.
Two, background technology
Ramie fabric is unique fiber product of China, but because of its traditional dyeing and finishing pretreatment procedure long flow path, working (machining) efficiency is low, the utmost point is unfavorable for improving the capability and performance of ramee product, especially traditional ramie pre-treatment process adopts high temperature, highly basic more, has both caused the damage of ramee easily, makes the fiber yellowing, produce large amount of sewage again, the enlarged link environment pollution.
Supercritical CO
2Fluid has nontoxic odorless, do not fire, advantage such as cheap and easy to get, 31.04 ℃ of its critical-temperatures, critical pressure 7.38MPa only needs to change pressure, just can extract and separate substance under the condition of near ambient temperature, traditional organic solvent then needs by processes such as heating evaporations.This shows that supercritical fluid all has bigger applied value aspect dissolving, extraction, separation and quality transmission, the solvent recovery, meet developing direction pollution-free, low-cost, the efficient green chemical industry.
Three, summary of the invention
The objective of the invention is to utilize supercritical CO
2The solvent characteristics that fluid had is by the adjusting of pressure and temperature being controlled and being changed supercritical CO
2The solvent property of fluid makes it can remove the ramee impurities, improves the crudy of ramee product, has reduced the consumption of auxiliary agent greatly, thereby with the supercritical CO of environment-friendly type
2Fluid technique replaces conventional high-temperature, the strong alkali pretreatment of ramie fabric.
This and other purpose of the present invention will further be launched and embody by following detailed description and explanation.
Supercritical CO of the present invention
2The method of fluid treatment ramie fabric is characterized in that ramie fabric is put into supercritical fluid treatment device, and treatment temperature is 80-140 ℃, and operating pressure is 20-35Mpa, and the processing time is 20-60 minute.
Further, supercritical CO of the present invention
2The method of fluid treatment ramie fabric is characterized in that ramie fabric is put into supercritical fluid treatment device, and treatment temperature is 100-120 ℃, and operating pressure is 20-30Mpa, and the processing time is 30-50 minute.
Be preferably supercritical CO of the present invention
2The method of fluid treatment ramie fabric is characterized in that ramie fabric is put into supercritical fluid treatment device, and treatment temperature is 120 ℃, and operating pressure is 25-30Mpa, and the processing time is 35-45 minute.
At supercritical CO of the present invention
2In the method for fluid treatment ramie fabric, if necessary in supercritical fluid treatment device, also can add the auxiliary agent of fabric weight 0.1-1.0%; Be preferably the auxiliary agent that can add fabric weight 0.1-0.5%, described auxiliary agent is an acetone.
The present invention adopts supercritical CO
2Fluid carries out pre-treatment to ramee, replace conventional high temperature, concentrated base is handled the pre-treatment process of ramee, by to the assorted situation that contains on the ramie fabric after supercritical fluid technique is handled, micro-structural, machinery, the test analysis of physical property and character such as thermally-stabilised shows: the supercritical fluid technique treatment process can replace traditional alkali pretreatment, it is effective to have impurity elimination, the characteristics that capillary effect is high, and can improve ramee structural behaviour, improve its expansion character, reduce auxiliary dosage, do not produce environmental pollution, avoided conventional high-temperature, the influence of highly basic technology and yellowing powerful to ramie is for fast, high-quality, the efficient ramee of handling provides new mode.
The present invention adopts supercritical CO for improving the sewage discharge of ramie fabric crudy, minimizing ramie fabric printing and dyeing process
2Fluid technique is used the printing and dyeing pre-treatment processing of ramie fabric, does not need to use alkaline agent and special auxiliary agent, only needs CO
2Gas and first supercritical processing equipment, and by the adjusting of pressure and temperature being controlled and being changed supercritical CO
2The solvent property of fluid just can be removed the ramee impurities, if add small amount of acetone, more can make the clearance of contained lignin in the ramee obtain to improve.
1, the supercritical process condition is to the influence of ramie fabric slurry removal of impurity
Supercritical CO
2Technology is to the dissolving situation of the contained slurry impurity of ramie fabric and the influence of weight slip, before the contained part natural impurity of ramie fabric being described and dying the hydrophobic substance that brings of fabrication processes as the spinning additive, weave with slurry, lubricant etc., can high dissolution in supercritical CO
2Fluid solution and being removed, under above-mentioned treatment temperature, pressure and processing time condition, the weight slip of its contained slurry impurity is between 1.562-0.244%; The weight slip of its total impurities content is between 0.55-2.87%.In addition, finish and release CO in first supercritical processing
2During pressure, small amount of impurities dissolved in the first supercritical processing process, extraction easily reassembles and is oil drop, sticks to the outer surface of fabric.This is passed through supercritical CO
2The rate of release of fluid pressure is suitably controlled and can be prevented that above-mentioned defect from producing.
2, supercritical CO
2Processing is to the influence of ramie fabric swelling effect
Through supercritical CO
2After the processing, the ramee filling density increases, and reduces through close, and the density increase is particularly remarkable; This be since ramee at supercritical CO
2Under the fluid effect, hemicellulose, pectin, lignin and the reduction of oily wax on the fiber make fiber macromolecular chain joint go up hydroxyl and the hydrone contact probability increases; Simultaneously because the fiber duct is subjected to supercritical CO
2Fluid injects, variation in various degree all takes place in its duct surfaces externally and internally physical aspect, heavy collection, stick to the impurity on surface, fiber duct under the physics chemical action of supercritical CO 2 fluid, dissolve gradually, come off, the mechanical impact force of supercritical CO 2 fluid in addition, make the sclerosis cell of fiber become the garden, it is more easy that hydrone enters the fiber duct, thereby make the easier permeable fiber of dyestuff, finally cause the capillary effect of fiber obviously to rise, its wetting time 56.8 seconds when being untreated foreshorten to 30.97 seconds.
3, first supercritical processing is to the influence of ramee mechanical property
Find after adopting above-mentioned given PROCESS FOR TREATMENT ramie fabric: the physical index of ramee after first supercritical processing, its fracture strength and the degree of polymerization all have reduction in various degree, fracture elongation increases, and this removal and temperature with impurity such as the contained colloid of ramee, slurry, greases is relevant to the fiber strength influence; Clearance that it should be noted that cellulignin is higher, compares with being untreated, and its lignin removing rate can improve more than 30%.
4, first supercritical processing is to the influence of ramee thermal stability
With the U.S. US Perkin-Elmer Tg thermogravimetric analyzer ramie fabric before and after handling through supercritical CO 2 is handled, and the fabric that processing under the different temperatures obtains is carried out heat analysis find, its heat endurance of ramie fabric of handling without supercritical CO 2 is starkly lower than the ramee after supercritical CO 2 is handled, this phenomenon shows, be difficult for fiber during with the supercritical carbon dioxide treatment ramee and cause damage, heat is unique factor that influences fibre property.For this class of ramie non-thermoplastic fiber, do not have the states of matter branch problem, but undertaken by general mechanical relaxation process, heating is not the principal element that forms stress decay, its effect only is to promote the carrying out of this process.Ramee degree of crystallinity test result before and after handling is shown: the ramee after supercritical CO 2 is handled is compared with the ramee before the processing, and its degree of crystallinity increases to some extent, and its increasing degree is between 1.3-4.3%.
5, first supercritical processing and ramee configuration of surface
The ESEM and the microphotograph of ramee sample before and after handling are compared, it is more that the surface impurity of sample is handled at the end, adhere to closely with fiber, fiber surface after treatment becomes smooth, the groove crackle of fiber surface is high-visible, this can be summed up as dissolving cleaning and the physical mechanical effect of supercritical CO 2 fluid to fiber impurity, and fiber has been produced further swelling; By the cross-sectional picture of fiber as seen, the cell of handling the back fiber obviously becomes round, and it is big that diameter becomes, and more confirmed the swelling effect of supercritical CO 2 fluid treatment to ramee.
Below further specify the present invention by specific embodiment, but embodiment only be used for the explanation, can not limit the scope of the invention.
In the present invention, if not refer in particular to, all part, percentages are unit of weight, and all equipment and raw material etc. all can be buied from market or the industry is commonly used.
The specific embodiment
Example 1:
To be cut into 5cm * 3cm as the ramie embryo cloth of test specimen, the accurately weighing after 24 hours through vacuumize and balance, according to process conditions as described below, successively sample is put into overcritical coupon, and be respectively charged into auxiliary agent by test requirements document, screw coupon then, and, open CO the coupon overcritical sample machine of packing into
2Fluid reservoir charges into CO
2Gas also pressurizes with force (forcing) pump on request, the gas after the pressurization is imported be equipped with in the coupon of sample, carries out supercritical CO respectively according to the temperature and pressure of setting
2Fluid treatment, processing finish the back by gas bleeder valve with CO
2Gas is drained, and takes out and handles the back sample.
Sample: ramie fine cloth: 12cm * 12cm/27,8tex * 27.8tex 236 * 236, the grey cloth rate of sizing: 7-8%, slurry is formed: PVA85%, starch slurry 15%;
Supercritical fluid treatment device: produced in USA, trade mark is: ISCO, and model is: the SFX2-10 treatment temperature is 80 ℃, and operating pressure is 20Mpa, and the processing time is 60 minutes.
Example 2
Adopt method and following process conditions as example 1:
Treatment temperature is 100 ℃, and operating pressure is 25Mpa, and the processing time is 50 minutes, adds the acetone of 0.5 weight %.
Example 3
Adopt method and following process conditions as example 1:
Treatment temperature is 140 ℃, and operating pressure is 35Mpa, and the processing time is 20 minutes, adds the acetone of 0.1 weight %.
Example 4
Adopt method and following process conditions as example 1:
Treatment temperature is 120 ℃, and operating pressure is 25Mpa, and the processing time is 40 minutes, adds the acetone of 0.1 weight %.
Claims (6)
1. supercritical CO
2The method of fluid treatment ramie fabric is characterized in that ramie fabric is put into supercritical fluid treatment device, and treatment temperature is 80-140 ℃, and operating pressure is 20-35Mpa, and the processing time is 20-60 minute.
2. supercritical CO according to claim 1
2The method of fluid treatment ramie fabric is characterized in that ramie fabric is put into supercritical fluid treatment device, and treatment temperature is 100-120 ℃, and operating pressure is 20-30Mpa, and the processing time is 30-50 minute.
3. supercritical CO according to claim 1
2The method of fluid treatment ramie fabric is characterized in that ramie fabric is put into supercritical fluid treatment device, and treatment temperature is 120 ℃, and operating pressure is 25-30Mpa, and the processing time is 35-45 minute.
4. according to the described supercritical CO of one of claim 1-3
2The method of fluid treatment ramie fabric is characterized in that also can adding the auxiliary agent of fabric weight 0.1-1.0% in supercritical fluid treatment device.
5. supercritical CO according to claim 4
2The method of fluid treatment ramie fabric is characterized in that also can adding the auxiliary agent of fabric weight 0.1-0.5% in supercritical fluid treatment device.
6. according to claim 4 or 5 described supercritical COs
2The method of fluid treatment ramie fabric is characterized in that described auxiliary agent is an acetone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410080840 CN1587491A (en) | 2004-10-12 | 2004-10-12 | Method for treating ramie fabric by super critical CO2 fluid |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410080840 CN1587491A (en) | 2004-10-12 | 2004-10-12 | Method for treating ramie fabric by super critical CO2 fluid |
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| CN1587491A true CN1587491A (en) | 2005-03-02 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104313891A (en) * | 2014-10-17 | 2015-01-28 | 苏州大学 | Starch slurry desizing method adopting supercritical carbon dioxide as medium |
| CN105113026A (en) * | 2015-08-14 | 2015-12-02 | 辽宁轻工职业学院 | Supercritical carbon dioxide ionic liquid degumming method for apocynum venetum bast fibers |
| CN110373893A (en) * | 2019-07-22 | 2019-10-25 | 宁波石墨烯创新中心有限公司 | A kind of graphene conductive fabric and preparation method thereof |
| CN112251938A (en) * | 2020-10-12 | 2021-01-22 | 贵州航天乌江机电设备有限责任公司 | Method for supercritical cleaning and drying duck feather |
| CN112813694A (en) * | 2021-02-01 | 2021-05-18 | 江苏康乃馨羽绒制品科技有限公司 | Fine and soft processing method of rough sheet based on fluid medium |
-
2004
- 2004-10-12 CN CN 200410080840 patent/CN1587491A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104313891A (en) * | 2014-10-17 | 2015-01-28 | 苏州大学 | Starch slurry desizing method adopting supercritical carbon dioxide as medium |
| CN105113026A (en) * | 2015-08-14 | 2015-12-02 | 辽宁轻工职业学院 | Supercritical carbon dioxide ionic liquid degumming method for apocynum venetum bast fibers |
| CN110373893A (en) * | 2019-07-22 | 2019-10-25 | 宁波石墨烯创新中心有限公司 | A kind of graphene conductive fabric and preparation method thereof |
| CN112251938A (en) * | 2020-10-12 | 2021-01-22 | 贵州航天乌江机电设备有限责任公司 | Method for supercritical cleaning and drying duck feather |
| CN112813694A (en) * | 2021-02-01 | 2021-05-18 | 江苏康乃馨羽绒制品科技有限公司 | Fine and soft processing method of rough sheet based on fluid medium |
| CN112813694B (en) * | 2021-02-01 | 2023-02-28 | 江苏康乃馨羽绒制品科技有限公司 | Fine and soft processing method of rough sheet based on fluid medium |
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