CN113564914B - Continuous processing method for improving hydrophilic performance of pure cotton non-woven fabric - Google Patents
Continuous processing method for improving hydrophilic performance of pure cotton non-woven fabric Download PDFInfo
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- 229920000742 Cotton Polymers 0.000 title claims abstract description 125
- 239000004745 nonwoven fabric Substances 0.000 title claims abstract description 123
- 238000003672 processing method Methods 0.000 title claims abstract description 15
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 79
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 63
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000007788 liquid Substances 0.000 claims abstract description 38
- 238000005406 washing Methods 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 26
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- 238000001035 drying Methods 0.000 claims description 19
- 239000004744 fabric Substances 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 239000012530 fluid Substances 0.000 claims description 8
- 238000002791 soaking Methods 0.000 claims description 6
- 238000005470 impregnation Methods 0.000 claims description 5
- 239000002904 solvent Substances 0.000 claims description 5
- 238000010924 continuous production Methods 0.000 claims 5
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- 230000000052 comparative effect Effects 0.000 description 5
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- 150000002191 fatty alcohols Chemical class 0.000 description 2
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- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 235000010987 pectin Nutrition 0.000 description 2
- 229920001277 pectin Polymers 0.000 description 2
- 239000001814 pectin Substances 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
- D06M11/32—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond
- D06M11/36—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond with oxides, hydroxides or mixed oxides; with salts derived from anions with an amphoteric element-oxygen bond
- D06M11/38—Oxides or hydroxides of elements of Groups 1 or 11 of the Periodic Table
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
- D06M11/32—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond
- D06M11/34—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond with oxygen, ozone or ozonides
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
- D06M13/10—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing oxygen
- D06M13/144—Alcohols; Metal alcoholates
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/02—Natural fibres, other than mineral fibres
- D06M2101/04—Vegetal fibres
- D06M2101/06—Vegetal fibres cellulosic
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
- Y02P70/62—Manufacturing or production processes characterised by the final manufactured product related technologies for production or treatment of textile or flexible materials or products thereof, including footwear
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Abstract
The invention provides a continuous processing method for improving the hydrophilic performance of pure cotton non-woven fabric. The method combines liquid phase treatment liquid containing sodium hydroxide and ethanol with gas phase ozone for treatment, firstly, the pure cotton non-woven fabric is subjected to treatment liquid dipping treatment, is transmitted into an ozone generating device for ozone treatment in a long-ring tension-free mode after being subjected to rolling treatment, and is washed and dried to obtain the pure cotton non-woven fabric with improved hydrophilic performance; wherein, the treatment liquid in the dipping treatment device and the washing liquid in the washing treatment device respectively form liquid seals for the inlet and the outlet of the ozone generating device. Through the method, the double treatment for improving the hydrophilicity of the pure cotton non-woven fabric is realized at normal temperature by utilizing the physical ozone auxiliary chemical action, so that the pure cotton non-woven fabric has good hydrophilic performance and better uniformity; in addition, the method utilizes the transmission device to realize continuous processing of the pure cotton non-woven fabric, has simple and convenient process and is convenient for batch processing production.
Description
Technical Field
The invention relates to the technical field of non-woven fabric production, in particular to a continuous processing method for improving the hydrophilic performance of pure cotton non-woven fabric.
Background
The non-woven fabric is a fabric formed without spinning and weaving, and is formed by only carrying out orientation or random arrangement on short fibers or filaments to form a fiber web structure and then reinforcing the fiber web structure by adopting a specific process method; it is known as a cloth because of its appearance and certain properties. The non-woven fabric is also called non-woven fabric, has the characteristics of softness, flexibility, moisture resistance, ventilation and the like, and has rapid technical development and wider application.
With the change of the raw materials of the non-woven fabric and the progress of the technology, the pure cotton non-woven fabric is generated due to the restriction of environmental protection and the restriction of national industrial policy of the wood pulp and the artificial fiber. The pure cotton non-woven fabric is made of natural fiber pure cotton, and is formed by opening and loosening cotton, finishing the pure cotton into a net by using a tip carding machine, a net laying machine and a drawing machine, and winding cotton fibers into the fabric by using a specific process. In recent years, domestic pure cotton non-woven fabrics are developed at the rate of 60% of the annual growth rate, and the future development trend is rapid. Compared with the traditional non-woven fabrics, the texture of the pure cotton non-woven fabrics is softer, and the energy-saving and environment-friendly effects are also better, so that the pure cotton non-woven fabrics are widely applied to medical and health products, personal care products, high-comfort clothes and the like.
The pure cotton non-woven fabric has higher requirements on the hydrophilic performance no matter applied to the fields of medical and health, clothing, personal care and the like, but the pure cotton non-woven fabric has poorer hydrophilic performance because the fiber contains a lot of hydrophobic accompanying impurities such as oil wax, pectin, higher fatty alcohols and the like. At present, a multi-section hydrophilic agent soaking method is adopted for improving the hydrophilicity of the non-woven fabric, and a document with the application publication number of CN110424155A discloses a hydrophilic agent for the non-woven fabric and a preparation method thereof, wherein the non-woven fabric is soaked by adopting a plurality of chemical agents to prepare the hydrophilic agent, so that the hydrophilicity of the pure cotton non-woven fabric is improved; however, the method needs a complex and large amount of chemical reagent, needs to be carried out at high temperature, and consumes large resources; moreover, the improvement effect is not ideal, the cost is higher, and the actual application requirement is difficult to achieve.
In view of the foregoing, there is a need for a continuous processing method for improving the hydrophilic properties of pure cotton nonwovens.
Disclosure of Invention
The invention aims to provide a continuous processing method for improving the hydrophilic performance of pure cotton non-woven fabric, which combines liquid phase treatment liquid treatment with gas phase ozone treatment, and realizes double treatment for improving the hydrophilic performance of the pure cotton non-woven fabric at normal temperature; the continuous processing technology for improving the hydrophilic performance of the pure cotton non-woven fabric is realized by sequentially communicating the dipping pretreatment, the rolling treatment, the ozone treatment, the washing treatment and the drying treatment among the devices through a transmission device.
In order to achieve the above-mentioned object, the present invention provides a continuous processing method for improving the hydrophilic performance of a pure cotton nonwoven fabric, comprising the steps of:
s1, preparing a treatment fluid: the solute of the treatment fluid is sodium hydroxide and ethanol, the solvent is water, the mass fraction of the sodium hydroxide is 1-3%, and the mass fraction of the ethanol is 1-3%;
s2, soaking pretreatment: carrying out impregnation pretreatment on the pure cotton non-woven fabric, wherein the impregnation pretreatment adopts the treatment liquid obtained in the step S1;
s3, rolling treatment: the pure cotton non-woven fabric subjected to the dipping pretreatment in the step S2 is subjected to padding, so that the pretreated pure cotton non-woven fabric is obtained, and the liquid carrying rate of the padding treatment is 70% -90%;
s4, ozone treatment: transmitting the pretreated pure cotton non-woven fabric in the step S3 to an ozone generating device for treatment in a long-loop tension-free mode;
s5, washing treatment: washing the pure cotton non-woven fabric subjected to ozone treatment in the step S4 by adopting hot water, wherein the washing temperature is 60-80 ℃;
s6, drying treatment: drying the pure cotton non-woven fabric washed in the step S5 to obtain pure cotton non-woven fabric with improved hydrophilic performance;
wherein, the devices used in the process method of any step from the step S2 to the step S6 are sequentially communicated, and continuous processing of the pure cotton non-woven fabric is realized through a transmission device.
As a further improvement of the present invention, in step S4, the pure cotton nonwoven fabric is treated in the ozone generating device for 10 to 30 minutes.
As a further improvement of the invention, the treatment time of the pure cotton non-woven fabric in the ozone generating device is controlled by the transmission device.
As a further improvement of the present invention, it is characterized in that: the ozone concentration in the ozone generating device is 8-12 g/h.
As a further improvement of the invention, the ozone generating device is provided with at least two groups of cloth guide rollers which are parallel to each other and limit rods which are arranged between two adjacent groups of cloth guide rollers at intervals up and down, so that the long-ring tension-free mode transmission of the pure cotton non-woven cloth is realized.
As a further improvement of the present invention, in step S2, the immersion pretreatment employs a pretreatment device provided at an inlet of the ozone generating device to form a liquid seal with the inlet of the ozone generating device.
As a further improvement of the present invention, in step S5, the washing treatment employs a washing device provided at the outlet of the ozone generating device to form a liquid seal with the outlet of the ozone generating device.
As a further improvement of the invention, the cloth guide roller is also arranged in the pretreatment device, the washing device and the drying device, so that continuous transmission of the pure cotton non-woven cloth is realized.
As a further development of the invention, in step S3, the rolling treatment is carried out with two parallel abutted pressure rubber rollers, which are arranged obliquely above in the pretreatment device and at the same time in the ozone generating device.
As a further improvement of the present invention, in step S6, the drying process employs a drying device adjacent to the washing device.
The beneficial effects of the invention are as follows:
1. the continuous processing method for improving the hydrophilic performance of the pure cotton non-woven fabric combines the liquid phase treatment liquid containing sodium hydroxide and ethanol with the gas phase ozone treatment, and realizes double treatment for improving the hydrophilic performance of the pure cotton non-woven fabric at normal temperature, so that the original poor hydrophilic performance of the pure cotton non-woven fabric is converted into excellent hydrophilic performance, and water drops on the surface of the pure cotton non-woven fabric can be quickly absorbed, and meanwhile, the pure cotton non-woven fabric has better hydrophilic uniformity. In addition, the method realizes sequential communication among devices through a transmission device by carrying out dipping pretreatment, rolling treatment, ozone treatment, washing treatment and drying treatment, and the pure cotton non-woven fabric realizes continuous automatic processing in the whole process engineering, so that the process is simple and convenient, labor is not required to be wasted, and batch processing is convenient.
2. The invention combines liquid phase treatment liquid containing sodium hydroxide and ethanol with gas phase ozone by adopting the physical auxiliary chemical action of ozone, thereby reducing the dosage of chemical reagents and being more energy-saving and environment-friendly. Wherein the liquid-phase treatment fluid solute comprises 1-3% of sodium hydroxide and 1-3% of ethanol by mass, and the solvent is water. When the pure cotton non-woven fabric passes through the treatment liquid, under the auxiliary effect of ethanol permeation increase, sodium hydroxide can react partial hydrophobic impurities on the fiber surface of the pure cotton non-woven fabric into small molecular substances, so that the hydrophilic performance is obviously improved; and the hydrophobic impurities are hydrolyzed to form surfactant substances, so that the hydrophilic wetting property of the cotton fibers is improved. Particularly, the addition of 1-3% sodium hydroxide into the treatment liquid has little influence on other properties of the pure cotton non-woven fabric, and avoids damage to the mechanical properties of the pure cotton non-woven fabric. After the pure cotton non-woven fabric pretreated by the treatment liquid enters an ozone environment, the ozone can continuously decompose the residual hydrophobic impurities on the surface and inside of the pure cotton non-woven fabric under the alkaline favorable condition to generate products such as hydroxyl with good hydrophilicity, so that the hydrophilicity of the pure cotton non-woven fabric is further improved, and redundant impurities and pollutants are not generated.
3. According to the invention, the inlet and the outlet of the ozone generating device respectively use the treatment liquid in the pretreatment device and the washing liquid in the washing device to form a liquid seal, so that the internal ozone reaction space and the external environment are isolated, a closed space is formed, ozone leakage is avoided, and the treatment effect on the pure cotton non-woven fabric is ensured. Particularly, the pure cotton non-woven fabric is driven by the ozone generating device through the fabric guide roller and continuously transmitted in a tension-free mode in a long loop, so that ozone and the surface of the pure cotton non-woven fabric are uniformly in collision contact, and damage to the fiber structure and mechanical property of the pure cotton non-woven fabric can be avoided.
Drawings
FIG. 1 is a process equipment diagram of a continuous processing method for improving the hydrophilic performance of a pure cotton non-woven fabric.
Reference numerals
1-a pretreatment device; 2-a rolling device; 3-an ozone generating device; 4-a washing device; 5-a drying device; 6-a cloth guide roller; 7-limit rod.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
It should be noted that, in order to avoid obscuring the present invention due to unnecessary details, only structures and/or processing steps closely related to aspects of the present invention are shown in the drawings, and other details not greatly related to the present invention are omitted.
In addition, it should be further noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Referring to fig. 1, the continuous processing method for improving the hydrophilic performance of the pure cotton non-woven fabric provided by the invention comprises the following steps:
s1, preparing a treatment fluid: the solute of the treatment fluid is sodium hydroxide and ethanol, the solvent is water, the mass fraction of the sodium hydroxide is 1-3%, and the mass fraction of the ethanol is 1-3%.
S2, soaking pretreatment: the pure cotton non-woven fabric is transferred into a pretreatment device 1 for dipping pretreatment, and the solution in the pretreatment device 1 is the treatment solution obtained in the step S1.
When the pure cotton non-woven fabric is immersed in the treatment liquid, sodium hydroxide can cause the impurity of the partial hydrophobic substances such as oil wax, pectin, higher fatty alcohols and the like in the pure cotton non-woven fabric fiber to undergo hydrolysis reaction, and the reaction is a micromolecular substance, so that the hydrophilic performance can be obviously improved; and the hydrophobic impurities are hydrolyzed to form surfactant substances, so that the hydrophilic wetting property of the cotton fibers is improved. In addition, the ethanol in the treatment liquid can strengthen the permeation of sodium hydroxide, so that the sodium hydroxide can better permeate into the pure cotton non-woven fabric, and the effect of better improving the hydrophilic performance of the pure cotton non-woven fabric is exerted.
S3, rolling treatment: passing the purified cotton non-woven fabric subjected to the dipping pretreatment in the step S2 through a pressing and rolling device 2 to obtain the pretreated purified cotton non-woven fabric with the liquid carrying rate of 70-90%; wherein the rolling device 2 is a pressure rubber roller which is arranged obliquely above the pretreatment device 1 and simultaneously in parallel and closely abuts against the ozone generating device 3.
S4, ozone treatment: the pure cotton non-woven fabric pretreated in the step S3 is transported to an ozone generating device 3 in a tension-free long-loop mode by a cloth guide roller 6 to be treated for 10 to 30 minutes; wherein, the ozone concentration in the ozone generating device 3 is 8-12 g/h, at least two groups of cloth guide rollers 6 which are parallel to each other and limit rods 7 which are arranged between two groups of adjacent cloth guide rollers at intervals up and down are arranged in the ozone generating device 3, thus realizing the long-ring tension-free mode transmission of the pure cotton non-woven fabric.
When the pure cotton non-woven fabric passes through the ozone generating device 3, the ozone converts hydrophobic groups in impurities remained on the surface and inside of the pure cotton non-woven fabric into polar groups such as hydroxyl groups, carboxyl groups and the like, and the hydrophilicity of the pure cotton non-woven fabric is obviously improved. In addition, the ozone can be generated by utilizing oxygen in the air, redundant oxygen atoms can be combined into molecular oxygen in the process, no residual substances exist, the processing without residues and pollution is realized, and the subsequent cleaning work of the process is saved.
S5, washing treatment: transmitting the pure cotton non-woven fabric subjected to ozone treatment into a washing device 4 for washing, wherein the washing liquid in the washing device 4 is hot water, and the temperature is 60-80 ℃;
s6, drying treatment: and (5) conveying the pure cotton non-woven fabric washed in the step (S5) to a drying device (5) for drying treatment to obtain the pure cotton non-woven fabric with improved hydrophilicity.
Referring to fig. 1, the devices used in the steps S2 to S6 are sequentially connected, and continuous processing of the pure cotton non-woven fabric is achieved through a transmission device. Wherein, the pretreatment device 1 is arranged at the inlet of the ozone generating device 3, and the treatment liquid in the pretreatment device 1 forms a liquid seal for the inlet of the ozone generating device 3; the washing device 4 is arranged at the outlet of the ozone generating device 3, and the water solution in the washing device 4 forms a liquid seal for the outlet of the ozone generating device 3.
Preferably, the inlet and the outlet of the ozone generating device 3 respectively form a liquid seal by utilizing the liquid in the pretreatment device 1 and the washing device 4, so that the internal ozone reaction space and the external environment are isolated, a closed space is formed, ozone leakage is avoided, and the treatment effect on the pure cotton non-woven fabric is ensured. In particular, the pure cotton non-woven fabric is driven by the ozone generating device 3 through the fabric guide roller 6 and continuously transmitted in a tension-free mode in a long loop, so that ozone can be uniformly collided and contacted with the surface of the pure cotton non-woven fabric, and damage to the fiber structure and mechanical property of the pure cotton non-woven fabric can be avoided.
The continuous processing method for improving the hydrophilic performance of the pure cotton non-woven fabric provided by the invention is described below with reference to specific examples.
Examples 1 to 3 and comparative examples 1 to 4
A continuous processing method for improving the hydrophilic performance of pure cotton non-woven fabric comprises the following steps:
s1, preparing a treatment fluid: preparing a treatment solution with sodium hydroxide, ethanol and water as solvents, wherein the mass fraction of the sodium hydroxide is 1-3% and the mass fraction of the ethanol is 1-3%;
s2, soaking pretreatment: carrying out dipping pretreatment on the pure cotton non-woven fabric, wherein the solution is the treatment solution obtained in the step S1;
s3, rolling treatment: the purified cotton non-woven fabric subjected to the dipping pretreatment in the step S2 is subjected to rolling to enable the liquid carrying rate of the purified cotton non-woven fabric to be 80%, so that the pretreated purified cotton non-woven fabric is obtained;
s4, ozone treatment: and (3) transmitting the purified cotton non-woven fabric pretreated in the step (S3) into an ozone generating device (3) with the ozone concentration of 8-12 g/h in a long-loop tension-free mode for treatment, wherein the treatment time is 10-30 min.
S5, washing treatment: and washing the pure cotton non-woven fabric subjected to ozone treatment by hot water, wherein the washing temperature is 60 ℃.
S6, drying treatment: and (3) drying the pure cotton non-woven fabric washed in the step (S5) to obtain the pure cotton non-woven fabric with improved hydrophilicity.
Wherein, the inlet and the outlet of the ozone generating device 3 respectively use the treatment liquid and the washing liquid to form a liquid seal, isolate the internal ozone reaction space from the external environment, form a closed space, avoid ozone leakage and ensure the treatment effect on the pure cotton non-woven fabric. In particular, the pure cotton nonwoven is continuously transported in a tension-free manner in a long loop by being driven by the ozone generating device 3 via the cloth guide roller 6.
The hydrophilic properties of the purified cotton nonwoven were determined by an experiment using a drop spread time test, in which 0.05mL drops were counted starting on the samples of examples 1-3 and the time taken for the drops to fully wet spread on the nonwoven. The results are shown in Table 1.
TABLE 1 Process parameters and Performance test results for examples 1-3 and comparative examples 1-4
As can be seen from table 1, comparative example 4 is a pure cotton nonwoven fabric without any treatment, the water droplet diffusion time is more than 300s, and the hydrophilic performance is the worst; in comparative examples 1 and 3, the purified cotton nonwoven fabric was subjected to the pretreatment for impregnation and the ozone treatment, respectively, and it was found that the purified cotton nonwoven fabric was inferior in the hydrophilic property at this time, indicating that the hydrophilic property of the purified cotton nonwoven fabric could not be improved well by the treatment liquid alone or by the ozone treatment alone. Comparative example 2 the treatment of a pure cotton nonwoven fabric in the absence of ethanol in the treatment solution, compared to the results of example 2, demonstrates that the addition of ethanol to the treatment solution has an auxiliary effect on the improvement of the hydrophilic properties of the pure cotton nonwoven fabric. In examples 1-3, by changing the NaOH concentration, the ethanol concentration, the ozone concentration and the treatment time, it can be seen that the pure cotton nonwoven fabric can achieve excellent hydrophilic performance when the NaOH concentration is 3%, the ethanol concentration is 3%, the ozone concentration is 12g/h and the treatment time is 30min. Therefore, the hydrophilic performance of the pure cotton non-woven fabric is obviously improved by adding sodium hydroxide and ethanol into the treatment liquid and matching with ozone treatment.
In summary, the continuous processing method for improving the hydrophilic performance of the pure cotton non-woven fabric combines the liquid phase treatment liquid containing sodium hydroxide and ethanol with the gas phase ozone treatment, and realizes the double treatment of the hydrophilic performance of the pure cotton non-woven fabric at normal temperature, so that the original poor hydrophilic performance of the pure cotton non-woven fabric is converted into excellent hydrophilic performance, and meanwhile, the pure cotton non-woven fabric has better water absorption uniformity. In addition, the method sequentially carries out dipping pretreatment, rolling treatment, ozone treatment, washing treatment and drying treatment on the pure cotton non-woven fabric by using a transmission device, realizes continuous processing, has simple and convenient technical process, does not need manpower waste, and is convenient for batch processing.
The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention.
Claims (7)
1. A continuous processing method for improving the hydrophilic performance of pure cotton non-woven fabric is characterized by comprising the following steps: the method comprises the following steps:
s1, preparing a treatment fluid: the solute of the treatment fluid is sodium hydroxide and ethanol, the solvent is water, the mass fraction of the sodium hydroxide is 1-3%, and the mass fraction of the ethanol is 1-3%;
s2, soaking pretreatment: carrying out impregnation pretreatment on the pure cotton non-woven fabric, wherein the impregnation pretreatment adopts the treatment liquid obtained in the step S1;
s3, rolling treatment: the pure cotton non-woven fabric subjected to the dipping pretreatment in the step S2 is subjected to padding, so that the pretreated pure cotton non-woven fabric is obtained, and the liquid carrying rate of the padding treatment is 70-90%;
s4, ozone treatment: transmitting the pretreated pure cotton non-woven fabric in the step S3 to an ozone generating device for treatment in a long-loop tension-free mode; at least two groups of cloth guide rollers which are parallel to each other and limit rods which are arranged between two adjacent groups of cloth guide rollers at intervals up and down are arranged in the ozone generating device, so that the long-loop tension-free transmission of the pure cotton non-woven fabric is realized;
s5, washing treatment: washing the pure cotton non-woven fabric subjected to ozone treatment in the step S4 by adopting hot water, wherein the washing temperature is 60-80 ℃;
s6, drying treatment: drying the pure cotton non-woven fabric washed in the step S5 to obtain pure cotton non-woven fabric with improved hydrophilic performance;
the device used in the process method of any one of the steps S2 to S6 is sequentially communicated, and continuous processing of the pure cotton non-woven fabric is realized through a transmission device;
in step S2, the soaking pretreatment adopts a pretreatment device, and the pretreatment device is arranged at the inlet of the ozone generating device and forms a liquid seal with the inlet of the ozone generating device; in step S5, the washing treatment is performed by using a washing device, and the washing device is disposed at the outlet of the ozone generating device to form a liquid seal with the outlet of the ozone generating device.
2. The continuous process for improving the hydrophilic properties of a purified cotton nonwoven fabric according to claim 1, wherein: in the step S4, the treatment time of the pure cotton non-woven fabric in the ozone generating device is 10-30 min.
3. The continuous processing method for improving the hydrophilic performance of the pure cotton non-woven fabric according to claim 2, which is characterized in that: the treatment time of the pure cotton non-woven fabric in the ozone generating device is controlled by the transmission device so as to realize continuous transmission and treatment of the pure cotton non-woven fabric.
4. A continuous process for improving the hydrophilic properties of a purified cotton nonwoven fabric as defined in claim 3, wherein: the ozone concentration in the ozone generating device is 8-12 g/h.
5. The continuous process for improving the hydrophilic properties of a purified cotton nonwoven fabric according to claim 1, wherein: the cloth guide roller is also arranged in the pretreatment device, the washing device and the drying device, so that continuous transmission of the pure cotton non-woven cloth is realized.
6. The continuous process for improving the hydrophilic properties of a purified cotton nonwoven fabric according to claim 1, wherein: in step S3, the rolling process is performed by using two parallel abutted pressure rubber rollers, which are disposed obliquely above the pretreatment device and in the ozone generating device.
7. The continuous process for improving the hydrophilic properties of a purified cotton nonwoven fabric according to claim 1, wherein: in step S6, the drying process employs a drying device adjacent to the washing device.
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