CN111621057A - Method for recycling waste fabric containing soluble fibers - Google Patents
Method for recycling waste fabric containing soluble fibers Download PDFInfo
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- CN111621057A CN111621057A CN202010392799.9A CN202010392799A CN111621057A CN 111621057 A CN111621057 A CN 111621057A CN 202010392799 A CN202010392799 A CN 202010392799A CN 111621057 A CN111621057 A CN 111621057A
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- Prior art keywords
- fabric
- fiber
- alkali
- fibers
- soluble polyester
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J11/00—Recovery or working-up of waste materials
- C08J11/04—Recovery or working-up of waste materials of polymers
- C08J11/06—Recovery or working-up of waste materials of polymers without chemical reactions
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
- C07C29/09—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by hydrolysis
- C07C29/095—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by hydrolysis of esters of organic acids
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/09—Preparation of carboxylic acids or their salts, halides or anhydrides from carboxylic acid esters or lactones
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2301/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
- C08J2301/02—Cellulose; Modified cellulose
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Abstract
The invention relates to a method for recycling waste fabrics containing soluble fibers, which comprises the following steps: and (3) placing the fabric in an alkaline solution with lower concentration, dissolving the soluble polyester fiber, stripping and drying the remaining loose fiber aggregate, and then slightly carding by a carding machine to obtain the regenerated natural fiber. After the dissolved solution is purified and separated, high-purity terephthalic acid and ethylene glycol can be obtained and used for polymerization of the soluble polyester chips again.
Description
Technical Field
The invention belongs to the field of waste fabric recovery, and particularly relates to a method for recycling soluble fiber-containing waste fabrics.
Background
Countless textiles worldwide become waste textiles that cannot be reused, or are of low grade, which causes waste of resources and environmental pollution problems. The recycling of waste textiles is a new low-carbon and environment-friendly development trend, so that resources are saved, and the environment is protected.
According to statistics, the processing amount of textile fibers per year in China exceeds 5000 ten thousand tons, more than 2000 ten thousand tons of waste textiles are generated, only 15% of the waste textiles are recycled, 85% of the waste textiles are sent to a refuse landfill or are burnt, a large amount of waste textiles are continuously accumulated, and the waste textiles cannot be recycled, so that the current situation that resources are increasingly tense is caused. At present, most of waste textiles are mainly recovered by a physical recovery method, such as primary mechanical processing or incineration, so that the recovery value and the regeneration economic benefit of the waste textiles are greatly limited. In recent years, in the aspect of chemical recovery, China makes some progress in the aspect of recycling single-component waste cotton fabrics or waste polyester fabrics, and the progress in the aspect of efficient separation and recycling of components of waste polyester-cotton blended fabrics is slower, so that the recycling and reusing of polyester-cotton textiles are greatly influenced.
The existing textile fibers have no technology and products which can be simply treated and recycled, and the important reasons are that the textile raw materials are complex in composition, color and ready-made clothes accessories, the fabric structure is compact, and the fiber damage is large after opening and carding. At present, in the market, only the high-value textiles such as pure-spun cashmere, aramid fiber and the like are subjected to opening and carding to obtain fibers with low strength and short length, and the fiber utilization rate is low.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for recycling waste fabrics containing soluble fibers, and overcomes the defects of compact fabric structure, large fiber damage after opening and carding, complex recycling process, high cost and the like in the prior art. The method of the present invention can directly recover regenerated natural fiber and high-purity terephthalic acid and ethylene glycol.
The invention relates to a recyclable and reusable fabric which is characterized by being a weft-knitted fabric formed by alternating blended yarns of natural cellulose fibers and soluble polyester filaments.
The natural cellulose is cotton fiber and/or hemp fiber.
The fabric is prepared by the following method: the natural cellulose fiber and the soluble polyester fiber are blended according to a certain proportion, and the blended yarn and the soluble polyester filament are woven into the fabric.
Weaving the blended yarn and the soluble polyester filament yarn by using a circular knitting machine to obtain: the weft knitted fabric with the mixed yarn and the soluble polyester filament yarn alternated has good detachability, and the soluble polyester fiber and the soluble polyester filament yarn are dissolved to form the yarn which is singly dispersed and only contains the non-soluble natural fiber, so the yarn is easy to be combed and loosened into the closely arranged natural cellulose fiber, and the damage to the fiber is small.
The blending ratio of the soluble polyester fiber to the natural cellulose fiber is 50/50 or 35/65.
The invention relates to a recycling method of fabric, which comprises the following steps:
(1) carrying out low-alkali treatment on the fabric according to claim 1, dissolving soluble polyester fibers and soluble polyester filaments to obtain fiber clusters of natural fibers (namely loose fiber aggregates of the natural fibers) and an alkali dissolving solution;
(2) untwisting and carding the fiber mass of the natural fibers in the step (1) to obtain regenerated natural fibers;
and (2) purifying and separating the alkali dissolving solution in the step (1) to obtain terephthalic acid and ethylene glycol, which can be used for polymerization of soluble polyester chips again.
In the step (1), the alkali treatment is carried out by dipping the waste fabric in alkali liquor, and the bath ratio is 1: 10.
The alkali treatment specifically comprises the following steps: the concentration of the alkali liquor is 4-5g/L NaOH solution, the treatment temperature is 100 ℃, and the treatment time is 0.5-2 h.
Untwisting and carding the fiber mass in the step (2) are as follows: untwisting on a yarn twister, and combing by using a dense comb.
The purification and separation in the step (2) are specifically as follows: introducing an alkali solution into a regulating reservoir, sequentially carrying out pretreatment and a membrane system, then entering an acid separation tank, filtering wastewater in the acid separation tank, and separating out terephthalic acid in the process to obtain terephthalic acid; and (4) separating the waste liquid after acid precipitation by a filtering membrane system to obtain the ethylene glycol.
The pretreatment is pH adjustment, and the pH value is 7.
Advantageous effects
According to the invention, after soluble fibers are dissolved in waste fabrics containing soluble fibers through low-alkali treatment, the non-soluble natural cellulose fibers are convenient to open and comb by utilizing the dispersibility of weft knitted fabrics, and can be used after gentle combing with small damage to the strength and length of the fibers due to loose fiber aggregates, the damage to the fibers is small, the utilization rate is high, the strength after treatment is kept at 95%, and the length retention rate is more than 90%. The spinnability and serviceability of the non-soluble natural cellulose fiber are ensured. The dissolved solution can be purified and separated to obtain high-purity terephthalic acid and ethylene glycol, and can be used for polymerization of soluble polyester chips for producing soluble polyester fibers, so that the efficient cyclic utilization of the fibers is realized.
Drawings
FIG. 1 is a schematic diagram of a natural cellulose fiber recycling process of the present invention;
FIG. 2 is a schematic view of the recovery structure of the alkali dissolution liquid of the present invention.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Example 1
The soluble polyester fiber and the cotton fiber are blended, the blending ratio is 50/50, 35/65 and the like, the blended yarn and the soluble polyester filament are woven into a weft knitting knitted fabric by a circular knitting machine according to the specification of the conventional cellulose fiber or blended yarn, the weft knitting knitted fabric is dissolved in a closed cylinder, 100 percent NaOH is added at 5g/L, the dissolving temperature is 100 ℃, the dissolving time is 60 minutes, the bath ratio is 1:10, and a disinfectant and a cleaning agent are added to dissolve, disinfect and clean the soluble fiber and the soluble polyester filament.
After the insoluble loose cotton fibers are dried, the fibers are lightly loosened and carded, the damage to the length and the strength of the fibers is small, the spinnability and the wearability of the original fibers are kept, and the high-quality regenerated cotton fibers are obtained, so that the cotton fibers can be recycled to produce high-quality yarns. After treatment, the strength is kept at 95 percent, and the length retention rate is more than 90 percent.
As shown in fig. 2, the discharged solution is introduced into a regulating reservoir after passing through a grid, sequentially passes through a pretreatment and a membrane system, is dissolved by alkali passing through the membrane system and enters an acid precipitation tank, wastewater in the acid precipitation tank is introduced into a centrifugal filter for filtration, terephthalic acid is precipitated in the process to separate out the terephthalic acid, and the acid-precipitated waste liquid passes through a filtration membrane system to separate out ethylene glycol.
Claims (8)
1. The recyclable and reusable fabric is characterized by being a weft-knitted fabric formed by alternating blended yarns of natural cellulose fibers and soluble polyester filaments.
2. The fabric according to claim 1, wherein the natural cellulose is cotton fiber and/or hemp fiber.
3. The fabric of claim 1, wherein the blend ratio of the soluble polyester fiber to the natural cellulose fiber is 50/50 or 35/65.
4. A method of recycling a fabric, comprising:
(1) subjecting the fabric of claim 1 to an alkali treatment to obtain a mass of natural fibers and an alkali solution;
(2) untwisting and carding the fiber mass of the natural fibers in the step (1) to obtain regenerated natural fibers;
and (2) purifying and separating the alkali dissolving solution in the step (1) to obtain terephthalic acid and ethylene glycol.
5. The method as claimed in claim 4, wherein the alkali treatment in the step (1) is carried out by dipping the waste fabric in alkali liquor, and the bath ratio is 1: 10.
6. The method according to claim 5, wherein the alkali treatment is specifically: the concentration of the alkali liquor is 4-5g/L NaOH solution, the treatment temperature is 100 ℃, and the treatment time is 0.5-2 h.
7. The method according to claim 4, wherein the purification and separation in the step (2) are specifically: introducing an alkali solution into a regulating reservoir, sequentially carrying out pretreatment and a membrane system, then entering an acid separation tank, filtering wastewater in the acid separation tank, and separating out terephthalic acid in the process to obtain terephthalic acid; and (4) separating the waste liquid after acid precipitation by a filtering membrane system to obtain the ethylene glycol.
8. The method of claim 7, wherein the pretreatment is a pH adjustment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010392799.9A CN111621057A (en) | 2020-05-11 | 2020-05-11 | Method for recycling waste fabric containing soluble fibers |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010392799.9A CN111621057A (en) | 2020-05-11 | 2020-05-11 | Method for recycling waste fabric containing soluble fibers |
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| Publication Number | Publication Date |
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| CN111621057A true CN111621057A (en) | 2020-09-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010392799.9A Pending CN111621057A (en) | 2020-05-11 | 2020-05-11 | Method for recycling waste fabric containing soluble fibers |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101260585A (en) * | 2008-02-29 | 2008-09-10 | 龙岩成冠纺织有限公司 | Method for producing soluble polyester fiber sirospun untwisted towel yarn |
| CN105369421A (en) * | 2015-11-26 | 2016-03-02 | 余燕平 | Preparing method of non-twist textiles or hollow textiles or highly-branched textiles and methods for recycling solute of alkali solutions |
| CN106065085A (en) * | 2016-06-30 | 2016-11-02 | 余燕平 | A kind of recovery of solubilized textile, regenerate, recycling technology |
| CN110219072A (en) * | 2019-07-11 | 2019-09-10 | 余燕平 | It can dissolve the reuse method of textile |
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2020
- 2020-05-11 CN CN202010392799.9A patent/CN111621057A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101260585A (en) * | 2008-02-29 | 2008-09-10 | 龙岩成冠纺织有限公司 | Method for producing soluble polyester fiber sirospun untwisted towel yarn |
| CN105369421A (en) * | 2015-11-26 | 2016-03-02 | 余燕平 | Preparing method of non-twist textiles or hollow textiles or highly-branched textiles and methods for recycling solute of alkali solutions |
| CN106065085A (en) * | 2016-06-30 | 2016-11-02 | 余燕平 | A kind of recovery of solubilized textile, regenerate, recycling technology |
| CN110219072A (en) * | 2019-07-11 | 2019-09-10 | 余燕平 | It can dissolve the reuse method of textile |
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Application publication date: 20200904 |
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