阅读说明：本技术 一种循环再生高密锦纶面料的前处理工艺 (Pretreatment process of recycled high-density nylon fabric ) 是由 唐俊松 赵学谦 张建国 陈威 于 2021-06-15 设计创作，主要内容包括：本发明公开了一种循环再生高密锦纶面料的前处理工艺,该前处理工艺包括冷轧堆工艺和平幅退浆水洗工艺；冷轧堆工艺采用轧辊对织物坯布进行浸轧处理,然后将经过浸轧处理的织物坯布打卷,其外部套一层塑料薄膜并扎紧密封,进行转动冷堆处理；该平幅退浆水洗工艺包括膨润阶段、平幅精炼阶段和高频震荡水洗阶段；平幅退浆水洗工艺对经过冷轧堆处理的织物坯布先利用膨润剂进行膨润,再在低碱条件下进行平幅精炼处理,然后于高频震荡的条件下进行水洗。本发明根据面料自身特性,通过冷轧堆、膨润、低碱退浆处理和高效震荡水洗工艺的配合对再生锦纶面料进行前处理,可以保证再生锦纶面料退浆干净,并消除织物的内应力,充分释放纤维弹性,使布面平整。(The invention discloses a pretreatment process for a circularly regenerated high-density polyamide fabric, which comprises a cold pad-batch process and an open width desizing and washing process; the cold pad-batch process adopts a roller to pad the fabric grey cloth, then the padded fabric grey cloth is coiled, a layer of plastic film is sleeved outside the padded fabric grey cloth, the padded fabric grey cloth is tightly bound and sealed, and the rotating cold pad-batch process is carried out; the open-width desizing and washing process comprises a swelling stage, an open-width refining stage and a high-frequency oscillation washing stage; the open-width desizing and washing process comprises the steps of swelling the fabric gray fabric subjected to cold rolling and stacking treatment by using a swelling agent, carrying out open-width refining treatment under the condition of low alkali, and then washing under the condition of high-frequency oscillation. According to the invention, the regenerated nylon fabric is pretreated by matching the processes of cold rolling, swelling, low-alkali desizing treatment and high-efficiency vibration washing according to the characteristics of the fabric, so that the desizing of the regenerated nylon fabric can be ensured to be clean, the internal stress of the fabric is eliminated, the fiber elasticity is fully released, and the fabric surface is smooth.)

1. A pretreatment process of a cyclic regeneration high-density nylon fabric is characterized by comprising the following steps: the pretreatment process comprises a cold pad-batch process and an open-width desizing and washing process;

the cold pad-batch process adopts a roller to pad the fabric grey cloth, then the padded fabric grey cloth is coiled, a layer of plastic film is sleeved outside the padded fabric grey cloth, the padded fabric grey cloth is tightly bound and sealed, and the rotating cold pad-batch process is carried out;

the open-width desizing and washing process comprises a swelling stage, an open-width refining stage and a high-frequency oscillation washing stage; the open-width desizing and washing process adopts an open-width washing machine to swell the fabric grey cloth subjected to cold pad-batch treatment by using a swelling agent, then carries out open-width refining treatment under the condition of low alkali, and then carries out washing under the condition of high-frequency oscillation.

2. The pretreatment process of the recycled high-density nylon fabric according to claim 1, characterized in that: the cold pad-batch process adopts the following process formula and process conditions:

3. the pretreatment process of the recycled high-density nylon fabric according to claim 1, characterized in that: the process prescription and process conditions adopted in the open width refining stage in the open width desizing and washing process are as follows:

4. the pretreatment process of the recycled high-density nylon fabric according to claim 1, characterized in that: the swelling agent adopted in the swelling stage of the open-width desizing and washing process is high-molecular halide or ethylene carbonate.

5. The pretreatment process of the recycled high-density nylon fabric according to claim 1, characterized in that: the pre-treatment process also comprises a pre-setting process for pre-setting the fabric grey cloth treated by the open width desizing and washing process, wherein the pre-setting process adopts the following process prescription and process conditions:

Technical Field

The invention belongs to the technical field of textile dyeing pretreatment, and particularly relates to a pretreatment process for a recycled high-density nylon fabric.

Background

With the continuous improvement of living standard, people have higher and higher requirements on the functions of the garment fabric, and the garment fabric is required to be comfortable to wear, and has the texture of tender skin and meat and no bone when contacting with skin besides the normal requirement for taking. Therefore, in recent years, textile fabrics have developed trends of light and thin structure, moist style and functional use. In order to resist hot summer, a 'cool skin coat' as thin as cicada wings and light as catkin is also produced. The cool skin clothes adopt regenerated high-density nylon fabric (with the function of ultraviolet resistance and the mass per square meter of single-layer fabric is not more than 42 g/m)²The textile fabric) has even, dense, uneven and wrinkled feeling on the cloth surface, is not easy to be close to the skin when being worn, and is cool and comfortable. Meanwhile, the cool skin clothes have the functions of sun protection, moisture absorption, sweat releasing, moisture permeability, ventilation, softness, thinness, coolness and the like, so that people can enjoy the nature and easily respond to climate change, have a special luster style, are fresh and elegant, are comprehensive functional fabrics integrating various characteristics, and meet the consumption desire and personalized pursuit of modern people.

The ultrathin high-density regenerated nylon fabric is formed by interweaving regenerated 20D/24F nylon filaments and low stretch yarns, and the warp and weft density reaches 400T-450T; the regenerated nylon products are rarely used in the market at present, and the weaving production and dyeing and finishing processing technology of the regenerated superfine denier nylon products is still not mature, so that great production difficulty exists.

Although the regenerated high-density nylon fabric has a plurality of advantages, due to different production methods, the titer, the cross-sectional shape and the molecular structure of the fiber are different, so that the pretreatment, dyeing and after-treatment have certain differences. For the dyeing pretreatment process, the fiber-fiber arrangement density of the ultrathin high-density regenerated nylon fabric is high, the specific surface area of the fiber is large, the monofilament oil quantity is large, and high-concentration medium-viscosity sizing slurry, oil agent, wax and the like with high polymerization degree are required to be used during warping weaving, so that the slurry and the oil agent in a micro-air chamber between high-density fibers are difficult to be drained during desizing, and the subsequent dyeing process is influenced. Therefore, how to improve the pretreatment process of the regenerated high-density nylon fabric plays an important role in the quality of the product.

Disclosure of Invention

In order to solve the technical problems, the invention aims to provide a pretreatment process for a recyclable high-density nylon fabric. According to the invention, the regenerated nylon fabric is pretreated by matching the processes of cold rolling, swelling, low-alkali desizing treatment and high-efficiency vibration washing according to the characteristics of the fabric, so that the desizing of the regenerated nylon fabric can be ensured to be clean, the internal stress of the fabric is eliminated, the fiber elasticity is fully released, and the fabric surface is smooth.

In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme: a pretreatment process for a circularly regenerated high-density nylon fabric comprises a cold pad-batch process and an open width desizing and washing process;

the cold pad-batch process adopts a roller to pad the fabric grey cloth, then the padded fabric grey cloth is coiled, a layer of plastic film is sleeved outside the padded fabric grey cloth, the padded fabric grey cloth is tightly bound and sealed, and the rotating cold pad-batch process is carried out;

the open-width desizing and washing process comprises a swelling stage, an open-width refining stage and a high-frequency oscillation washing stage; the open-width desizing and washing process adopts an open-width washing machine to swell the fabric grey cloth subjected to cold pad-batch treatment by using a swelling agent, then carries out open-width refining treatment under the condition of low alkali, and then carries out washing under the condition of high-frequency oscillation.

Further, the cold pad-batch process adopts the following process recipes and process conditions:

further, the process recipe and process conditions adopted in the open width refining stage in the open width desizing and washing process are as follows:

furthermore, swelling agent adopted in the swelling stage of the open-width desizing and washing process is high molecular halide or ethylene carbonate.

Further, the pre-treatment process also comprises a pre-setting process for performing pre-setting treatment on the fabric grey cloth treated by the open width desizing and washing process, wherein the pre-setting process adopts the following process prescription and process conditions:

compared with the prior art, the invention has the following advantages and effects:

the cold pad-batch process of the invention can enable the auxiliary agent to permeate into the fabric, and realize the chemical degradation and emulsification (desizing, deoiling and alkali decrement) of oxidation products in the fabric. Under the designed process conditions, the cold batch treating fluid has stable chemical properties, soft and uniform acting force on fibers and small damage to the fibers, so that the physical indexes of the fibers are in a controllable range, the defect of poor control of the physical performance indexes of the fabrics by traditional high-temperature cloth refining of a machine cylinder can be overcome, the generation of quality difference among batches can be avoided, and the subsequent dyeing reproducibility and the one-time success rate are improved;

the open-width desizing and washing process comprises a swelling stage, an open-width refining stage and a high-frequency oscillation washing stage; the swelling stage adopts the swelling agent to treat the fabric, so that the swelling agent can be utilized to fully swell the fiber, the distance between macromolecular chains of the polyamide fiber is increased, the acting force between the macromolecular chains is reduced, the subsequent refined liquid can enter between high-density fibers and between the macromolecular chains, and the sizing agent, the oiling agent and the like between the fibers and between the macromolecular chains can be better removed; in the open-width refining stage, physical and chemical reactions such as hydrolysis, emulsification, dispersion, solubilization and the like of slurry and the like are accelerated by using a refining liquid so as to perform further low-alkali desizing and cleaning residues generated on the cloth surface by a cold rolling stack process; in the high-efficiency oscillation washing stage, an oscillator is adopted for oscillation washing, and degraded, alkali hydrolyzed and emulsified impurities are washed (cleaned) by oscillation washing to obtain excellent desizing rate and hand feeling.

The open-width desizing and washing process can effectively control further emulsification and oxidative decomposition of the sizing agent and the oil agent, and utilizes dispersion, emulsification, washing and depolymerization caused by the high-frequency oscillation action of the oscillator during high-efficiency washing to reduce the surface tension of dirt adhered to the fiber, reduce the molecular adhesion between impurity particles and the fabric, separate the dirt, the sizing agent and the oil dirt, disperse the dirt in the washing tank, emulsify, disperse and remove the dirt, desize and remove the oil more thoroughly, and the obtained fabric has better wettability, impurity removal rate and whiteness.

The pretreatment process disclosed by the invention has high desizing efficiency, can enable the fabric to naturally shrink in a low-tension state in the whole process, enables the fiber to fully swell and release internal stress, and can thoroughly solve the problems that the fabric has different tension and is easy to wrinkle in the subsequent dyeing process; the fabric fiber treated by the method is fully opened, the dye-uptake rate in the subsequent dyeing process is high, and the fabric has the characteristics of soft, glutinous and fluffy hand feeling, fineness, fullness, good drapability, fluffy feel, softness, no bone feel and the like.

Detailed Description

The technical solutions in the present invention will be described clearly and completely with reference to specific embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Examples

Fabric grey cloth: the recycled and regenerated high-density nylon fabric is formed by interweaving regenerated 20D/24F nylon filaments and low stretch yarns.

The regenerated nylon used by the fabric is derived from waste nylon silk screens, carpets and the like, and is prepared by carrying out regeneration granulation slicing and spinning through depolymerization and repolymerization processes.

The sizing agent on the recycled high-density nylon grey cloth mainly takes chemical sizing agents such as PVA, PVC and the like as main materials; designing a pretreatment process according to the characteristics of higher sizing rate and ultrahigh density of the fabric grey cloth; the pretreatment process comprises a cold pad-batch process and an open width desizing and washing process, and is divided into two steps and three stages: cold rolling, low-alkali refining treatment and high-efficiency oscillation washing;

the cold pad-batch process comprises the steps of padding fabric grey cloth into padding liquid by using a roller, rolling the padded fabric grey cloth, sleeving a layer of plastic film outside the fabric grey cloth, tightly fastening and sealing the fabric grey cloth, and performing rotary cold pad-batch treatment;

the cold rolling process adopts the following process prescription and process conditions:

wherein g/L represents the gram number of the mass of the substance contained in 1L of the cold batch treatment liquid. Specifically, 1L of cold batch treatment liquid is prepared by adding water to a constant volume of 1L, wherein 50g of liquid caustic soda, 1g of deoiling agent TF-126A, 3g of hydrogen peroxide, 1g of penetrating agent, 2g of chelating dispersant and 2g of quick desizing agent.

The cold pad-batch stage is mainly to allow the penetration of the auxiliaries into the fabric and to achieve chemical degradation and emulsification (desizing, degreasing, alkali reduction) of the oxidation products in the fabric. Under the designed process conditions, the cold batch treating fluid has stable chemical properties, soft and uniform acting force on fibers and small damage to the fibers, so that the physical indexes of the fibers are in a controllable range, the defect of poor control of the physical performance indexes of the fabrics by traditional high-temperature cloth refining of a machine cylinder is overcome, the generation of quality difference among batches can be avoided, and the subsequent dyeing reproducibility and the one-time success rate are improved.

The open width desizing and washing process adopts an open width washing machine to carry out open width refining treatment on the fabric gray fabric subjected to cold pad-batch treatment under the condition of low alkali, and then washing is carried out under the condition of oscillation;

the process prescription and process conditions adopted in the open width refining process are as follows:

wherein g/L represents the number of grams of the mass of a substance contained in 1L of a refining liquid. Specifically, the 1L of refining liquid is prepared by using 20g of liquid alkali, 1g of chelating dispersant TF-510C and 0.5g of high-efficiency refining agent TF-188A, and adding water to a constant volume of 1L.

Specifically, the open width water washing machine comprises ten treatment tanks, and the temperature of each tank is shown in table 1.

TABLE 1 open width rinsing machine bath temperature

Machine trough	Temperature/. degree.C
		Swell a groove	60
Refining two-tank	80
		Refining three-groove	98
Refining three-groove	98
		Five-tank water washing	95
Washing six-tank	90
		Seven grooves for water washing	85
Eight water washing tanks	60
		Nine grooves for water washing	60
Neutralizing tank	40

The open width desizing and washing process is divided into two stages, wherein the open width refining stage is mainly to accelerate physical and chemical reactions such as hydrolysis, emulsification, dispersion, solubilization and the like of slurry and the like by using a refining liquid so as to carry out further desizing and wash residues generated on the cloth surface by a cold rolling process; in the high-efficiency oscillation washing stage, an oscillator is adopted for oscillation washing, and degraded, alkali hydrolyzed and emulsified impurities are washed (cleaned) by oscillation washing to obtain excellent desizing rate and hand feeling.

The open-width desizing and washing process can effectively control further emulsification and oxidative decomposition of the sizing agent and the oil agent, and utilizes dispersion, emulsification, washing and depolymerization caused by the high-frequency oscillation action of the oscillator during high-efficiency washing to reduce the surface tension of dirt adhered to the fiber, reduce the molecular adhesion between impurity particles and the fabric, separate the dirt, the sizing agent and the oil dirt, disperse the dirt in the washing tank, emulsify, disperse and remove the dirt, desize and remove the oil more thoroughly, and the obtained fabric has better wettability, impurity removal rate and whiteness.

In the pretreatment process, the fabric naturally contracts under a low-tension state in the whole process, so that the fiber is fully swelled and internal stress is released, and the problems that the fabric has different tension and is easy to wrinkle in the subsequent dyeing process can be solved more thoroughly; the treated fabric has the characteristics of full fiber opening, high dye-uptake rate, soft and glutinous hand feeling, good drapability, fluffy feel, softness, no bone feel and the like; the pretreatment process has high desizing efficiency, the grooves of the open-width washing machine are connected through the circulating pump, and hot water in the rear groove flows to the front groove to clean the cloth surface, so that a large amount of industrial water can be saved.

The pretreatment process also comprises a pre-setting process; the pre-setting process adopts the following process formula and process conditions:

wherein g/L represents the mass of the substance contained in 1L of the pre-setting treatment liquid. Specifically, 1L of the pre-shaping treatment liquid is prepared by using 20g of anti-yellowing agent RUCOGEN NOX, 2g of pH regulator RUCO-ACID ABS and adding water to a constant volume of 1L.

The recycled regenerated nylon fiber has higher crystallinity, the crystalline regions and the non-crystalline regions are closely arranged, the arrangement of the crystalline regions and the non-crystalline regions can be changed into order by presetting, the tension unevenness generated by the nylon fiber in spinning drafting and weaving processing is reduced or eliminated, and the uniformity of subsequent dyeing can be effectively improved. Meanwhile, the surface flatness and the anti-wrinkle capability of the fabric can be improved through presetting, wrinkle marks and fabric retraction wrinkles generated in dyeing of the fabric are reduced, and the dimensional stability of the fabric in subsequent processing can be improved; in addition, under the high-temperature condition, the elasticity of the fabric can be damaged to a certain extent, and the amino group at the tail end of the fiber is easily oxidized (acid dye coloring group), so that the coloring performance of the nylon is damaged; the pre-setting process can solve the problems by adding the high-temperature anti-yellowing agent and setting the proper pre-setting temperature, and ensures that the elasticity of the fabric and the color absorption performance of subsequent dyeing are not influenced.

Verifying the amount of the residual size of the fabric by adopting a cationic dye coloring method:

the cationic dye coloring method comprises the following specific steps: adopting cationic dye X-2GL red, 0.02% (o.w.f), bath ratio of 1:50, pH value of 4.5, and technological conditions of: washing with water at 50 deg.C for 10min, and oven drying. The color depth of the cloth surface is observed; by observation, the fabric treated by the method has less color on the cloth surface, which indicates that the residual size on the cloth surface is less.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.