Production and preparation process of antibacterial fiber bedding fabric based on microfluidic technology

Abstract

The invention discloses an antibacterial fiber bedding fabric production and preparation process based on a micro-fluidic technology, and relates to the technical field of fabric preparation processes, and the antibacterial fiber bedding fabric production and preparation process comprises the following steps: preparing viscose-based apocynum venetum antibacterial fibers with skin-core structures based on the micro-fluidic technology; preparing a composite warm-keeping antibacterial breathable antistatic functional bedding fabric; the invention relates to a dyed and finished composite warm-keeping antibacterial breathable antistatic functional bedding fabric. The viscose-based apocynum venetum fiber spinning solution with the alpha cellulose mass fraction as high as 94.8% is prepared by using a whole plant apocynum venetum strip as a raw material, so that the utilization rate of the apocynum venetum strip and the alpha cellulose mass fraction are improved, and the following at least four problems in the traditional technology are effectively solved: (1) the outer skin fiber amount of apocynum venetum is small; the pulp is prepared from raw materials in the traditional process, so that the pulp raw materials have fewer sources; (2) the hemp stalks after the skin is taken lose industrial value and need to be further treated additionally; (3) the penetrant added in the preparation process is an organic matter, so that water treatment is difficult; and (4) the alpha cellulose content of the prepared pulp is too low.

Description

Technical Field

[0001] The present invention relates to the technical field of fabric preparation technology, and in particular to a production and preparation process of antibacterial fiber bedding fabric based on microfluidic technology. Background Art

[0002] With the advancement of modern science and technology and the accelerated pace of life, people's demand and expectations for high-speed rail services are also constantly increasing, especially traditional bedding textiles, which are excellent media for the attachment and transmission of bacteria and viruses, and are prone to cross-infection, which directly affects the health of passengers. At the same time, bedding textiles in a dry environment are very likely to generate static electricity, further affecting the comfort of passengers. In addition, traditional bedding textiles are difficult to be naturally degraded by microorganisms after being discarded, and are very likely to pollute the environment if treated by traditional means.

[0003] It can be seen that traditional bedding products usually only have the warming function mainly for practical use, and the current bedding textiles mainly for practical use can no longer meet the demand. Therefore, the development of high value-added, diversified natural fiber fabrics with more than two composite functions has become an urgent development direction for functional bedding products. Summary of the invention

[0004] To this end, the present invention provides a production process for antibacterial fiber bedding fabrics based on microfluidics technology to solve the above-mentioned technical problems existing in the prior art for traditional bedding textiles.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A production process for antibacterial fiber bedding fabric based on microfluidic technology, comprising the following steps:

[0007] Preparation of viscose-based apocynum antibacterial fiber with skin-core structure based on microfluidic technology;

[0008] Preparation of composite warm, antibacterial, breathable and antistatic functional bedding fabrics;

[0009] Dyeing and finishing composite warm, antibacterial, breathable and antistatic functional bedding fabric.

[0010] On the basis of the above technical solution, the present invention is further described as follows:

[0011] As a further embodiment of the present invention,

[0012] The method for preparing the viscose-based apocynum ramie antibacterial fiber with a skin-core structure based on microfluidic technology specifically comprises:

[0013] Preparation of viscose-based apocynum antibacterial fiber spinning solution;

[0014] Preparation of ionic liquid solvents;

[0015] Preparation of viscose-based apocynum antibacterial fiber composite spinning solution for microfluidic technology;

[0016] Preparation of viscose-based apocynum antibacterial fiber with skin-core structure by microfluidic technology;

[0017] Recycling of ionic liquids.

[0018] As a further embodiment of the present invention,

[0019] The preparation of the viscose-based apocynum antibacterial fiber spinning solution specifically includes:

[0020] Raw materials → preparation → cooking → washing → pulping → squeezing → alkali refining → washing → acid treatment → washing → hydrogen peroxide bleaching → sodium hypochlorite bleaching → acid treatment → washing → finished pulp;

[0021] The raw material is set as a whole root of Lophatherum ramie, and the finished pulp is set as a viscose-based Lophatherum ramie spinning stock solution with a mass fraction of type A cellulose as high as 94.8%.

[0022] As a further embodiment of the present invention,

[0023] The steaming process specifically comprises:

[0024] Prepare whole apocynum venetum branches as raw materials, cut the whole apocynum venetum branches into apocynum venetum strips with a length ranging from 3 to 5 cm to complete the material preparation; introduce a relative absolute dry pulp amount, that is, the ratio of the mass of the absolute dry part in the pulp to the mass of the total pulp; add 11% of sodium sulfide and 3.5% of sodium dodecylbenzene sulfonate to 33% of sodium hydroxide relative to the absolute dry pulp to prepare an alkali solution;

[0025] Through the three factors and three levels of cooking orthogonal test, the optimal combination process parameters for large-scale production were obtained through limited number of tests.

[0026] The prepared cut Apocynum venetum branches and the prepared alkali solution are placed in a steamer for a steaming process. The temperature is raised to 125°C and the pressure is 0.3MPa after 25 minutes. Then, steam is released. The steam release time is 10 minutes and the terminal pressure is set to 0.03MPa. After the first steam release, the temperature is raised to 158°C and the pressure is 0.6MPa after 28 minutes. After keeping warm for 30 minutes, the second steam release is carried out. The steam release time is 8 minutes and the terminal pressure is set to 0.32MPa. After the steam release is completed, the temperature is raised to 158°C and the pressure is 0.65MPa after 28 minutes. After keeping warm for 95 minutes, the steam is released for the third time and the terminal pressure is set to 0Mpa.

[0027] The alkali refining process specifically includes:

[0028] After the cooking process, the mass fraction of cellulose alpha (i.e., α-cellulose) in the pulp is 86% to 88%. The orthogonal test of alkali refining is carried out with three factors and three levels, namely, the mass concentration of refining alkali, the refining temperature, and the refining time, to obtain the optimal combined process parameters for large-scale production.

[0029] Adding 33% of sodium hydroxide relative to the absolute dry pulp to carry out alkali refining process, the reaction time is 55min, and the mass fraction of type A cellulose in the pulp is increased to 92.2% to 94.8%;

[0030] The bleaching process specifically comprises:

[0031] The traditional bleaching process is to directly use sodium hypochlorite for bleaching, but the whiteness of the apocynum pulp after bleaching with sodium hypochlorite is relatively low. Therefore, after many tests, a two-stage bleaching process was adopted, that is, the first stage was bleached with hydrogen peroxide, and the second stage was bleached with sodium hypochlorite, and the whiteness of the pulp could be further improved by 7% to 8%;

[0032] The optimal combination of process parameters for large-scale production was obtained by conducting a three-factor three-level hydrogen peroxide bleaching orthogonal test based on the mass fraction of hydrogen peroxide, bleaching temperature and bleaching time.

[0033] Specifically, 10% to 12% of sodium hydroxide relative to the absolute dry pulp amount is added to the bleaching tank to adjust the pulp pH value, and sodium silicate, magnesium sulfate and hydrogen peroxide are added in sequence for primary bleaching, the primary bleaching temperature is 80° C. to 90° C., the primary bleaching time is 80 min to 100 min, and then secondary bleaching is performed, sodium hypochlorite with an effective chlorine content of 10% is added, and the effective chlorine content in the pulp is maintained in the range of 0.35 g / L to 0.45 g / L, the free alkali range is 85 mg / L to 95 mg / L, the temperature range is controlled at 43° C. to 47° C., the bleaching time range is 95 min to 105 min, the residual chlorine range is 0.25 g / L to 0.35 g / L, and the residual alkali range is 75 mg / L to 80 mg / L;

[0034] The pre-acid treatment step specifically includes:

[0035] Add 0.1% to 0.15% oxalic acid relative to the absolute dry pulp amount, 0.3% to 0.5% sodium hexametaphosphate relative to the absolute dry pulp amount, then add 37% hydrochloric acid with a mass percentage concentration to adjust the acid content of the pulp to 0.3g / L to 0.9g / L, the acid treatment time ranges from 55min to 65min, and the temperature ranges from 65°C to 75°C;

[0036] After the pre-acidification process, the ash mass fraction and iron content in the slurry are significantly reduced, and the acid-soluble impurities in the slurry are dissolved, which is more conducive to improving the whiteness of the slurry in the subsequent process, while reducing the consumption of bleaching chemicals.

[0037] As a further embodiment of the present invention,

[0038] The preparation of the ionic liquid solvent specifically includes:

[0039] In order to cleanly prepare viscose-based apocynum venetum antibacterial fiber, an improved green ionic liquid solvent was designed to enable it to dissolve apocynum venetum cellulose and thymol antibacterial agent.

[0040] Prepare 1-ethyl-3-methylimidazole diethyl phosphate ([Emim]DEP) solvent;

[0041] Through nuclear magnetic hydrogen spectrum, infrared spectrum, electrospray mass spectrometry and water content characterization test analysis, imidazole cationic liquids containing allyl, butyl and ethyl functional groups and DEP anions with excellent solubility for keratin and cellulose natural products were selected. － , N-methylimidazole and triethyl phosphate in a molar ratio of 1:1.1 were placed in a container equipped with a condenser reflux tube, and magnetically stirred at 140°C for 12 hours, then cooled and placed in a separatory funnel, repeatedly washed with ethyl acetate, and continued to use a rotary evaporator to vacuum evaporate at 75°C for 2 hours, and finally fully dried in a vacuum drying oven at 80°C to synthesize the ionic liquid 1-ethyl-3-methylimidazole diethyl phosphate ([Emim]DEP) solvent through a one-step synthesis method;

[0042] Compound [Emim]DEP / DMSO;

[0043] Since the viscosity of the ionic liquid cellulose spinning solution is too high, it is difficult to pass through the channels and chips of the microfluidic spinning machine; therefore, 30% of the polar aprotic solvent DMSO was added to the [Emim]DEP solvent to prepare the [Emim]DEP / DMSO solvent. The viscosity of the cellulose spinning solution system was effectively reduced by the compounding solvent, making it more suitable for microfluidic spinning.

[0044] As a further embodiment of the present invention,

[0045] The preparation of the viscose-based apocynum antibacterial fiber composite spinning solution for microfluidic technology specifically includes:

[0046] In order to improve the antibacterial effect and washing fastness of bedding, microfluidic technology is used to spin skin-core structure apocynum antibacterial fiber, that is, the antibacterial agent is coated inside the fiber to reduce the loss of the antibacterial agent.

[0047] Prepare the cortical solution;

[0048] The viscose-based apocynum ramie pulp prepared in the above-mentioned viscose-based apocynum ramie antibacterial fiber spinning solution preparation process is added to a DMSO / [Emim]DEP composite solution having a DMSO content of 30%, and heated to 55° C. and stirred for 1 hour to completely dissolve it, and finally a transparent DMSO / [Emim]DEP / cellulose composite spinning solution having a predetermined viscosity is obtained as the cortex spinning solution;

[0049] preparing a core layer solution;

[0050] A DMSO / [Emim]DEP composite solution with a DMSO content of 30% was used to dissolve a thymol extract of 1 / 4 of the mass of apocynum venetum pulp in a constant temperature water bath at 55°C, and the solution was allowed to stand for degassing until a clear and transparent DMSO / [Emim]DEP / thymol mixed antibacterial solution was obtained as the core layer mixed solution.

[0051] The method of preparing the skin-core structured viscose-based apocynum antibacterial fiber by microfluidic technology specifically includes:

[0052] Functionalized fibers with a skin-core structure are prepared by microfluidic technology, so that the antibacterial agent is coated inside the fiber to reduce the loss of the antibacterial agent; specifically, the prepared skin spinning solution and the core mixed solution are loaded into the first pump body and the second pump body of the microfluidic control, respectively, and further connected to the inner and outer channels of the Y-shaped coaxial microfluidic chip through a catheter, and then continue to enter the beaker containing deionized water as a coagulation bath from the Y-shaped coaxial microfluidic chip to form, and the flow rate ratio of the inner and outer phases is controlled to be 1:5, so that the microfluidic spinning process is smooth, and the obtained regenerated cellulose fiber maintains a smooth surface in both dry and wet states;

[0053] The recycling of the ionic liquid specifically includes:

[0054] The ionic liquid is recovered by vacuum distillation, specifically:

[0055] The ionic liquid aqueous solution in the coagulation bath is collected, and the collected ionic liquid aqueous solution is heated and rotary evaporated at 75°C for 2 hours, and then placed in a vacuum drying oven at 80°C for a drying process of not less than 48 hours to remove the volatile components in the ionic liquid. The water content is then measured using a Karl Fischer titrator to ensure that the water content of the recovered ionic liquid is below 1000 ppm. The recovered ionic liquid is used again for the preparation of antibacterial fiber, and this operation is repeated to recycle the ionic liquid for not less than 5 times.

[0056] As a further embodiment of the present invention,

[0057] The preparation of the composite warm-keeping, antibacterial, breathable and antistatic functional bedding fabric specifically includes:

[0058] The blending process of viscose-based apocynum antibacterial fiber and viscose fiber;

[0059] Process for spinning blended yarn of viscose-based antibacterial wool protein fiber and combed cotton with core-skin structure;

[0060] Weaving process of composite warm, antibacterial, breathable and antistatic functional bedding fabric.

[0061] As a further embodiment of the present invention,

[0062] The blended yarn process of the viscose-based apocynum antibacterial fiber and the viscose fiber specifically comprises:

[0063] The obtained viscose-based apocynum antibacterial fiber with a core-skin structure and viscose fiber were fully and evenly mixed in a ratio of 30:70, and a three-pass drawing process was carried out. After that, a compact siro spinning device was equipped, and 14.69 tex blended yarn was obtained by compact siro spinning of coarse yarn and fine yarn.

[0064] During the spinning process, the yarn evenness and average straightness of the apocynum fiber are controlled within a preset range to reduce accidental drafting during the spinning process; the center distance of the front middle roller is reduced so that the fiber speed change point is concentrated at the front jaw, which is more conducive to the stability of fiber speed change; the rubber ring jaw spacing is reduced according to the preset range, which is more conducive to reducing the unevenness of the drafting force and improving the yarn evenness; the small rear zone drafting multiple is set to strengthen the control of floating fibers, so as to delay the speed change of floating fibers, reduce the generation of hairiness, and improve the evenness of the yarn;

[0065] The spinning process parameters are set as follows: roller center distance 42mm×50mm, rubber ring jaw spacing 3mm, total draft multiple 25, back zone draft multiple 1.07; in order to reduce spinning breakage and tension fluctuations, the spinning twist coefficient is selected as 350, the wire ring is selected as BS5 / 0, and the spindle speed is 11000r / min; considering that the moisture permeability of apocynum itself is strong and the difference between dry and wet strength is large, the temperature and humidity of the environment during the spinning process are controlled, and local ultrasonic atomization humidification is adopted, and the relative humidity range is controlled to 62%~65%, and the temperature range is controlled to 22~25℃;

[0066] The process for spinning a blended yarn of viscose-based antibacterial wool protein fiber and combed cotton with a core-sheath structure specifically comprises:

[0067] Viscose-based antibacterial wool protein fiber with a core-sheath structure was prepared by the same process as the antibacterial viscose-based apocynum fiber with a core-sheath structure, and the core-sheath viscose-based antibacterial wool protein fiber and combed cotton were fully and evenly mixed in a ratio of 60:40, and three-pass combined drawing process was implemented to blend roving and spun yarn (compact spinning) to obtain a blended yarn of 14.62 tex, the total drafting multiple of the spun yarn was 62 times, of which the drafting in the back zone was 1.5 times, the twist coefficient of the spun yarn was 350, and the twist was 950 twists / m;

[0068] The weaving process of the composite warm-keeping, antibacterial, breathable and antistatic functional bedding fabric specifically comprises:

[0069] The 14.69tex viscose-based antibacterial ramie and viscose compact spinning blended yarn in the ratio of 30:70, the 14.62tex viscose-based antibacterial wool protein and combed cotton compact spinning blended yarn in the ratio of 60:40, and the 4.58tex 100% combed cotton compact spinning yarn were interwoven, and a double rib structure was adopted to finally prepare a weft-knitted bedding fabric with a predetermined elasticity, and its final ratio parameter was set to a gram weight of 215g / m 2 , thickness 1.19mm, horizontal density 83 vertical rows / 5cm, vertical density 89 horizontal rows / 5cm, with antibacterial, moisture absorption and heat generation, warmth retention and UV protection properties.

[0070] As a further embodiment of the present invention,

[0071] The dyeing and finishing process of the composite warm-keeping, antibacterial, breathable and antistatic functional bedding fabric specifically comprises:

[0072] Blank fabric → pre-treatment → dyeing → post-treatment → dehydration → drying → pre-shrinking and shaping → testing → curling. Through dyeing and finishing treatment, the composite warmth-keeping, antibacterial, breathable and antistatic functions of bedding fabrics are further improved;

[0073] The pre-shrinking process temperature is 170°C, the speed is 22m / min, and the upper and lower air volume is 100%;

[0074] As a further embodiment of the present invention,

[0075] The specific prescription and conditions of the pre-treatment process are as follows:

[0076] Prepare 3g / L cotton clean enzyme, 4g / L hydrogen peroxide, 1g / L glacial acetic acid, the bath ratio between bedding fabric and dye solution is 1:8, the specific pre-treatment process is shown in the following change table:

[0077]

[0078] Among them, the vertical direction is the temperature change amplitude, and the horizontal direction is the duration change amplitude;

[0079] The specific prescription and conditions of the dyeing process are as follows:

[0080] Dyeing with reactive dyes in one bath and two steps using a normal temperature and pressure dyeing machine;

[0081] 0.3% HB yellow, 1.95% HB red, 0.002% EC-R blue dye, 60g / L sodium sulfate, 22g / L soda ash, the bath ratio between bedding fabric and dye solution is 1:8. The specific dyeing process is shown in the following variation table:

[0082]

[0083] Among them, the deoxygenase uses a concentration value that conforms to the existing standards, the vertical direction is the temperature change amplitude, the horizontal direction is the time change amplitude, and the dissolution time of the dye, sodium sulfate and soda ash is their respective corresponding dissolution time limits;

[0084] The prescription and conditions of the post-processing process are as follows:

[0085] Prepare 1g / L glacial acetic acid and 1g / L soap detergent, the bath ratio between bedding fabric and dye solution is 1:8, and the specific post-treatment process is shown in the following change table:

[0086]

[0087] Among them, the vertical direction is the temperature change amplitude, and the horizontal direction is the duration change amplitude.

[0088] The present invention has the following beneficial effects:

[0089] 1. The whole plant apocynum venetum strips are used as raw materials to prepare viscose-based apocynum venetum fiber spinning solution with a cellulose A mass fraction of up to 94.8%, which improves the utilization rate of apocynum venetum strips and the cellulose A mass fraction, and effectively solves at least the following four problems existing in traditional technologies:

[0090] ① The amount of outer skin fiber of Apocynum venetum is small, and the traditional process of preparing pulp as raw material makes the source of pulp raw material even smaller;

[0091] ② After the outer skin is removed by traditional methods, the hemp stalks will lose their industrial value and need further treatment;

[0092] ③ The penetrant added in the traditional process is organic, which makes water treatment difficult;

[0093] ④The methyl fiber content of pulp prepared by traditional technology is too low.

[0094] The new technology has changed the current situation in which only discarded ramie skins and ramie stems are used in the existing technology, significantly reducing the waste of plant resources. No purification reagents need to be added during the preparation process, and the COD of the wastewater is between 33,000 mg / L and 40,000 mg / L, which not only reduces production costs but also reduces the difficulty of wastewater treatment.

[0095] 2. By selecting the relatively cheap plant thymol as the antibacterial agent; in order to cleanly prepare viscose-based ramie antibacterial fibers, an improved green ionic liquid solvent was developed: a compound [Emim]DEP / DMSO was prepared. The compound solvent can effectively reduce the viscosity of the cellulose spinning solution system and make it more suitable for microfluidic spinning; DMSO / [Emim]DEP / cellulose composite spinning solution was used as the cortex solution, and DMSO / [Emim]DEP / thymol mixed antibacterial solution was used as the core solution. Microfluidic technology was used to prepare functional fibers with a skin-core structure, so that the antibacterial agent was coated inside the fiber, which can effectively reduce the loss of the antibacterial agent and further improve the washing fastness and antibacterial effect of the antibacterial viscose-based ramie fiber.

[0096] 3. The use of vacuum distillation to recycle ionic liquids reduces energy consumption and also avoids environmental problems caused by solvent emissions during the spinning process, which has important economic and environmental significance. Recyclability and recycling are major advantages of ionic liquids over traditional solvents.

[0097] 4. Use 14.69tex skin-core structure antibacterial viscose-based ramie and viscose compact spinning blended yarn (30:70), 14.62tex skin-core structure antibacterial viscose-based wool protein and combed cotton compact spinning blended yarn (60:40) and 14.58tex100% combed cotton compact spinning yarn with double rib structure weft knitting to make a composite warm, antibacterial, breathable and antistatic functional train bedding fabric.

[0098] Because the bedding fabric contains antibacterial viscose-based ramie fiber, the fabric has good antibacterial and UV protection properties; the presence of antibacterial viscose-based wool protein fiber enhances the antibacterial, moisture absorption, heat preservation and antistatic properties of the fabric; and the addition of combed cotton fiber makes the fabric soft, moisture absorption, breathable and comfortable to wear; at the same time, after weaving design and dyeing and finishing process, it further has mechanical properties such as friction resistance, washability, softness, bursting resistance and high breathability. The ramie fiber, amino acid and protein it contains give the fabric excellent antibacterial, moisture absorption, heat preservation and warmth preservation properties, as well as UV protection and antistatic properties, and can be effectively used in composite warm-keeping, antibacterial, breathable and antistatic functional bedding fabrics in autumn and winter. BRIEF DESCRIPTION OF THE DRAWINGS

[0099] In order to more clearly illustrate the implementation mode of the present invention or the technical solution in the prior art, the drawings required for the implementation mode or the description of the prior art will be briefly introduced below. The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0100] Figure 1 A schematic diagram of the overall process of the production and preparation process of antibacterial fiber bedding fabrics based on microfluidic technology provided in an embodiment of the present invention.

[0101] Figure 2 A schematic diagram of the principle of the preparation process of viscose-based apocynum / wool protein antibacterial fiber with a core-sheath structure in the production process of antibacterial fiber bedding fabric based on microfluidic technology provided in an embodiment of the present invention.

[0102] Figure 3 A schematic diagram of the principle of the preparation process of a composite warm-keeping, antibacterial, breathable and antistatic functional bedding fabric in the production and preparation process of an antibacterial fiber bedding fabric based on microfluidic technology provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0103] The following is a description of the implementation of the present invention by specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0104] The terms such as "upper", "lower", "left", "right", and "middle" used in this specification are only for the convenience of description and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships should be regarded as within the scope of the invention without substantially changing the technical content.

[0105] At present, with the depletion of resources such as coal and oil and increasingly severe ecological pollution, the high-value utilization of natural plant resources is of far-reaching significance.

[0106] Apocynum fiber, also known as wild hemp and Zeqi hemp, has a long history and wide range of therapeutic effects. Because it contains phenolic substances, it has antibacterial, antihypertensive and anti-asthmatic, anti-lipid, far-infrared warming and UV protection functions. Its warmth retention is twice that of cotton below 8°C. The stem height of Apocynum can reach 1.5 to 2.0m. Apocynum is light-loving, drought-resistant, alkali-resistant, and has strong adaptability. It can grow in harsh conditions such as saline-alkali and deserts, and its sources are very abundant. However, the surface of Apocynum fiber is relatively smooth and curl-free, and it is short in length and high in linear density, which makes it easy to scatter during the spinning process, resulting in poor yarn dryness and difficulty in pure spinning. At present, the traditional method is to peel the whole branch of Apocynum, use the peeled bast fiber as raw material, and obtain hemp fiber bundles blended with cotton fiber or other fibers through a series of processes. The peeled hemp stalks basically lose their use value. The bark of the hemp branch accounts for about 20%, and the stem accounts for 80%. Most manufacturers use equipment to peel off the bark and only use the fibrous fibers in the bark, while the stem is treated as waste. In addition, plant thymol is a natural antibacterial agent and is relatively cheap. Cotton fiber is a natural fiber. Its main component, cellulose, is a natural polymer compound. Its molecular structure contains a large number of alcohol hydroxyl groups. Under standard conditions, the official moisture regain of cotton fiber is 8.5%. Therefore, it has the characteristics of moisture absorption and breathability, soft touch, and comfortable wearing. The cotton fiber structure has a central cavity, which contains a certain amount of air. At the same time, the cotton fiber is relatively short, and there are a large number of fiber gaps in the yarn, which are conducive to warmth preservation.

[0107] Therefore, in order to ensure the sleep quality and health of passengers, we are now developing high value-added composite warm-keeping, breathable, antistatic and antibacterial bedding fabrics for autumn and winter. Using viscose-based ramie fiber with antibacterial and warm-keeping effects and combed cotton fiber with good moisture absorption and breathability as the base material, adding viscose and viscose-based wool protein fibers with C-shaped hollow cross-section, soft hand feel, rich in amino acids, and high moisture absorption and calorific value, knitted structure design and interweaving to form grey fabrics, and then processed by dyeing and finishing processes, finally a composite multifunctional weft-knitted bedding with excellent antibacterial, moisture absorption and heating properties, as well as UV protection and antistatic properties, friction resistance, water washing resistance, softness, burst resistance and high breathability and other mechanical wear properties is obtained, which meets the demand for diversified functions of bedding and is economical and environmentally friendly.

[0108] In addition, when the bedding is discarded, it can be naturally degraded by microorganisms without polluting the environment, further effectively improving its economic and environmental performance.

[0109] like Figures 1 to 3As shown, an embodiment of the present invention provides a production and preparation process for antibacterial fiber bedding fabrics based on microfluidic technology, which can make viscose-based apocynum spinning stock solution through whole apocynum branches, and produce antibacterial fibers through microfluidic spinning, and produce antibacterial yarns through spinning, and then weave the warp and weft to obtain train bedding fabric grey cloth, and then produce composite warm-keeping, antibacterial, breathable and antistatic functional train bedding fabrics through dyeing and finishing.

[0110] Please refer to Figure 1 The above-mentioned antibacterial fiber bedding fabric production process specifically includes the following steps:

[0111] S1: Preparation of viscose-based apocynum antibacterial fiber with skin-core structure based on microfluidic technology;

[0112] S101: Preparation of viscose-based apocynum antibacterial fiber spinning solution;

[0113] The preparation process of viscose-based apocynum antibacterial fiber spinning solution specifically includes:

[0114] Raw materials (whole apocynum ramie branches) → preparation → cooking → washing → pulping → squeezing → alkali refining → washing → acid treatment → washing → hydrogen peroxide bleaching → sodium hypochlorite bleaching → acid treatment → washing → finished pulp (viscose-based apocynum ramie spinning stock solution with a mass fraction of type A cellulose of up to 94.8%);

[0115] The more specific process includes the following steps:

[0116] S1011: Steaming process

[0117] Prepare whole apocynum venetum branches as raw materials, cut the whole apocynum venetum branches into apocynum venetum strips with a length ranging from 3 to 5 cm to complete the material preparation; introduce a relative absolute dry pulp amount, that is, the ratio of the mass of the absolute dry part in the pulp to the mass of the total pulp; add 11% of sodium sulfide and 3.5% of sodium dodecylbenzene sulfonate to 33% of sodium hydroxide relative to the absolute dry pulp to prepare an alkali solution;

[0118] Through the three factors and three levels of cooking orthogonal test, the optimal combination process parameters for large-scale production were obtained through limited number of tests.

[0119] The prepared cut Apocynum venetum branches and the prepared alkali solution are placed in a digester for a cooking process, heated to 125°C for 25 minutes, with a pressure of 0.3MPa, and then steam is released, the steam release time is 10 minutes and the terminal pressure is set to 0.03MPa. After the first steam release is completed, the temperature is raised to 158°C for 28 minutes again, the pressure is 0.6MPa, and after keeping warm for 30 minutes, the second steam release is carried out, the steam release time is 8 minutes and the terminal pressure is set to 0.32MPa. After the steam release is completed, the temperature is raised to 158°C for 28 minutes again, the pressure is 0.65MPa, and after keeping warm for 95 minutes, the steam is released for the third time, and the terminal pressure is set to 0Mpa;

[0120] S1012: alkali refining process;

[0121] After the cooking process, the mass fraction of cellulose alpha (i.e., α-cellulose) in the pulp is 86% to 88%. The orthogonal test of alkali refining is carried out with three factors and three levels, namely, the mass concentration of refining alkali, the refining temperature, and the refining time, to obtain the optimal combined process parameters for large-scale production.

[0122] Adding 33% of sodium hydroxide relative to the absolute dry pulp to carry out alkali refining process, the reaction time is 55min, and the mass fraction of type A cellulose in the pulp is increased to 92.2% to 94.8%;

[0123] S1013: bleaching process;

[0124] The traditional bleaching process is to directly use sodium hypochlorite for bleaching, but the whiteness of the apocynum pulp after bleaching with sodium hypochlorite is relatively low. Therefore, after many tests, a two-stage bleaching process was adopted, that is, the first stage was bleached with hydrogen peroxide, and the second stage was bleached with sodium hypochlorite, and the whiteness of the pulp could be further improved by 7% to 8%;

[0125] The optimal combination of process parameters for large-scale production was obtained by conducting a three-factor three-level hydrogen peroxide bleaching orthogonal test based on the mass fraction of hydrogen peroxide, bleaching temperature and bleaching time.

[0126] Specifically, 10% to 12% of sodium hydroxide relative to the absolute dry pulp amount is added to the bleaching tank to adjust the pulp pH value, and sodium silicate, magnesium sulfate and hydrogen peroxide are added in sequence for primary bleaching, the primary bleaching temperature is 80° C. to 90° C., the primary bleaching time is 80 min to 100 min, and then secondary bleaching is performed, sodium hypochlorite with an effective chlorine content of 10% is added, and the effective chlorine content in the pulp is maintained in the range of 0.35 g / L to 0.45 g / L, the free alkali range is 85 mg / L to 95 mg / L, the temperature range is controlled at 43° C. to 47° C., the bleaching time range is 95 min to 105 min, the residual chlorine range is 0.25 g / L to 0.35 g / L, and the residual alkali range is 75 mg / L to 80 mg / L;

[0127] S1014: pre-acid treatment process;

[0128] Add 0.1% to 0.15% oxalic acid relative to the absolute dry pulp amount, 0.3% to 0.5% sodium hexametaphosphate relative to the absolute dry pulp amount, then add 37% hydrochloric acid with a mass percentage concentration to adjust the acid content of the pulp to 0.3g / L to 0.9g / L, the acid treatment time ranges from 55min to 65min, and the temperature ranges from 65°C to 75°C;

[0129] After the pre-acidification process, the ash mass fraction and iron content in the pulp decreased significantly, and the acid-soluble impurities in the pulp were dissolved, which was more conducive to improving the whiteness of the pulp in the subsequent process and reducing the consumption of bleaching chemicals.

[0130] The viscose-based apocynum antibacterial fiber spinning solution prepared by the above process improves the utilization rate of apocynum ramie strips and the mass fraction of type A cellulose, changes the current situation of only using apocynum ramie skin and apocynum ramie stems in the traditional technology, reduces plant waste, does not add any purification reagents during the preparation process, and the COD range of wastewater is 33000mg / L to 40000mg / L, which reduces both the production cost and the difficulty of wastewater treatment, and effectively solves the problems of insufficient utilization of apocynum ramie and difficulty in treating wastewater after pulping;

[0131] S102: preparation of ionic liquid solvent;

[0132] In order to cleanly prepare viscose-based apocynum venetum antibacterial fiber, an improved green ionic liquid solvent was designed to enable it to dissolve apocynum venetum cellulose and thymol antibacterial agent.

[0133] S1021: Preparation of 1-ethyl-3-methylimidazole diethyl phosphate ([Emim]DEP) solvent;

[0134] Through nuclear magnetic hydrogen spectrum, infrared spectrum, electrospray mass spectrometry and water content characterization test analysis, imidazole cationic liquids containing allyl, butyl and ethyl functional groups and DEP anions with excellent solubility for keratin and cellulose natural products were selected. － , N-methylimidazole and triethyl phosphate in a molar ratio of 1:1.1 were placed in a container equipped with a condenser reflux tube, and magnetically stirred at 140°C for 12 hours, then cooled and placed in a separatory funnel, repeatedly washed with ethyl acetate, and continued to use a rotary evaporator to vacuum evaporate at 75°C for 2 hours, and finally fully dried in a vacuum drying oven at 80°C to synthesize the ionic liquid 1-ethyl-3-methylimidazole diethyl phosphate ([Emim]DEP) solvent through a one-step synthesis method;

[0135] S1022: compound [Emim]DEP / DMSO;

[0136] Since the viscosity of the ionic liquid cellulose spinning solution is too high, it is difficult to pass through the channels and chips of the microfluidic spinning machine; therefore, 30% of the polar aprotic solvent DMSO was added to the [Emim]DEP solvent to prepare the [Emim]DEP / DMSO solvent. The viscosity of the cellulose spinning solution system was effectively reduced by the compounding solvent, making it more suitable for microfluidic spinning.

[0137] S103: Preparation of viscose-based apocynum antibacterial fiber composite spinning solution for microfluidic technology;

[0138] In order to improve the antibacterial effect and washing fastness of bedding, microfluidic technology is used to spin skin-core structure apocynum antibacterial fiber, that is, the antibacterial agent is coated inside the fiber to reduce the loss of the antibacterial agent.

[0139] S1031: preparation of cortical solution;

[0140] The viscose-based apocynum ramie pulp prepared in the above-mentioned viscose-based apocynum ramie antibacterial fiber spinning solution preparation process is added to a DMSO / [Emim]DEP composite solution having a DMSO content of 30%, and heated to 55° C. and stirred for 1 hour to completely dissolve it, and finally a transparent DMSO / [Emim]DEP / cellulose composite spinning solution having a predetermined viscosity is obtained as the cortex spinning solution;

[0141] S1032: core layer solution preparation;

[0142] Using a DMSO / [Emim]DEP composite solution with a DMSO content of 30% to dissolve a thymol extract with a mass of 1 / 4 of apocynum venetum pulp in a constant temperature water bath at 55° C., and standing to degas until a clear and transparent DMSO / [Emim]DEP / thymol mixed antibacterial solution is obtained as a core layer mixed solution;

[0143] S104: Preparation of viscose-based apocynum antibacterial fiber with skin-core structure by microfluidic technology;

[0144] Please refer to Figure 2 , a functional fiber with a skin-core structure is prepared by microfluidic technology, so that the antibacterial agent is coated inside the fiber to reduce the loss of the antibacterial agent; specifically, the prepared skin spinning solution and the core mixed solution are loaded into the first pump body and the second pump body of the microfluidic, respectively, and further connected to the inner and outer channels of the Y-shaped coaxial microfluidic chip through a catheter, and then continue to enter the beaker filled with deionized water as a coagulation bath from the Y-shaped coaxial microfluidic chip to form, and the flow rate ratio of the inner and outer phases is controlled to be 1:5, so that the microfluidic spinning process is smooth, and the obtained regenerated cellulose fiber maintains a smooth surface in both dry and wet states;

[0145] S105: Recycling of ionic liquids;

[0146] The ionic liquid is recovered by vacuum distillation, specifically:

[0147] The ionic liquid aqueous solution in the coagulation bath is collected, and the collected ionic liquid aqueous solution is heated and rotary evaporated at 75° C. for 2 h, and then placed in a vacuum drying oven at 80° C. for a drying process of not less than 48 h to remove volatile components in the ionic liquid, and then the water content is measured using a Karl Fischer titrator to ensure that the water content of the recovered ionic liquid is below 1000 ppm. The recovered ionic liquid is used again for the preparation of the antibacterial fiber, and the operation is repeated to recycle the ionic liquid for not less than 5 times;

[0148] Recyclability and recycling are a major advantage of ionic liquids over traditional solvents. They are an important way to reduce energy consumption and costs. They can also avoid environmental problems caused by solvent emissions during the spinning process, and have extremely important economic and environmental significance.

[0149] S2: Preparation of composite warm, antibacterial, breathable and antistatic functional bedding fabrics;

[0150] S201: Blended spinning process of viscose-based apocynum antibacterial fiber and viscose fiber;

[0151] The obtained viscose-based apocynum antibacterial fiber with a core-skin structure and viscose fiber were fully and evenly mixed in a ratio of 30:70, and a three-pass drawing process was carried out. After that, a compact siro spinning device was equipped, and 14.69 tex blended yarn was obtained by compact siro spinning of coarse yarn and fine yarn.

[0152] During the spinning process, the yarn evenness and average straightness of the apocynum fiber are controlled within a preset range to reduce accidental drafting during the spinning process; the center distance of the front middle roller is reduced so that the fiber speed change point is concentrated at the front jaw, which is more conducive to the stability of fiber speed change; the rubber ring jaw spacing is reduced according to the preset range, which is more conducive to reducing the unevenness of the drafting force and improving the yarn evenness; the small rear zone drafting multiple is set to strengthen the control of the floating fiber to delay the speed change of the floating fiber, reduce the generation of hairiness, and improve the evenness of the yarn; the spinning process parameters are set as follows: The center distance of the rollers is 42mm×50mm, the distance between the rubber ring jaws is 3mm, the total drafting multiple is 25, and the drafting multiple in the back zone is 1.07; in order to reduce spinning ends and tension fluctuations, the yarn twist coefficient is selected as 350, the wire ring is selected as BS5 / 0, and the spindle speed is 11000r / min; considering that the moisture permeability of apocynum itself is strong and the difference between dry and wet strength is large, the temperature and humidity of the environment during the spinning process are controlled, and local ultrasonic atomization humidification is used, and the relative humidity range is controlled to 62%~65%, and the temperature range is controlled to 22~25℃;

[0153] S202: Process for spinning blended yarn of viscose-based antibacterial wool protein fiber and combed cotton with skin-core structure;

[0154] Viscose-based antibacterial wool protein fiber with a core-sheath structure was prepared by the same process as the antibacterial viscose-based apocynum fiber with a core-sheath structure, and the core-sheath viscose-based antibacterial wool protein fiber and combed cotton were fully and evenly mixed in a ratio of 60:40, and three-pass combined drawing process was implemented to blend roving and spun yarn (compact spinning) to obtain a blended yarn of 14.62 tex, the total drafting multiple of the spun yarn was 62 times, of which the drafting in the back zone was 1.5 times, the twist coefficient of the spun yarn was 350, and the twist was 950 twists / m;

[0155] S203: Weaving process of composite warm, antibacterial, breathable and antistatic functional bedding fabric;

[0156] Please refer to Figure 3 14.69tex viscose-based antibacterial ramie and viscose compact spinning blended yarn in a ratio of 30:70, 14.62tex viscose-based antibacterial wool protein and combed cotton compact spinning blended yarn in a ratio of 60:40, and 4.58tex100% combed cotton compact spinning yarn were interwoven, and a double rib structure was adopted to finally prepare a weft-knitted bedding fabric with a predetermined elasticity, and its final ratio parameter was set to 215g / m 2 , thickness 1.19mm, horizontal density 83 vertical rows / 5cm, vertical density 89 horizontal rows / 5cm, with antibacterial, moisture absorption and heat generation, warmth retention and UV protection properties;

[0157] S3: Dyeing and finishing process of composite warm, antibacterial, breathable and antistatic functional bedding fabrics;

[0158] The specific dyeing and finishing process is: rough cloth → pre-treatment → dyeing → post-treatment → dehydration → drying → pre-shrinking and shaping (temperature is 170℃, speed is 22m / min, up and down air volume is 100%) → testing → curling. The composite warm, antibacterial, breathable and antistatic functions of bedding fabrics are further improved through dyeing and finishing.

[0159] S301: pre-treatment process;

[0160] The specific pre-treatment process prescription and conditions are as follows:

[0161] Prepare 3g / L cotton clean enzyme, 4g / L hydrogen peroxide, 1g / L glacial acetic acid, the bath ratio between bedding fabric and dye solution is 1:8, the specific pre-treatment process is shown in the following change table:

[0162]

[0163] Among them, the vertical direction is the temperature change amplitude, and the horizontal direction is the duration change amplitude;

[0164] S302: dyeing process;

[0165] Dyeing with reactive dyes in one bath and two steps using a normal temperature and pressure dyeing machine;

[0166] The specific dyeing process prescription and conditions are as follows:

[0167] 0.3% HB yellow, 1.95% HB red, 0.002% EC-R blue dye, 60g / L sodium sulfate, 22g / L soda ash, the bath ratio between bedding fabric and dye solution is 1:8. The specific dyeing process is shown in the following variation table:

[0168]

[0169] Among them, the deoxygenase uses a concentration value that conforms to the existing standards, the vertical direction is the temperature change amplitude, the horizontal direction is the time change amplitude, and the dissolution time of the dye, sodium sulfate and soda ash is their respective corresponding dissolution time limits;

[0170] S303: post-processing process;

[0171] The specific post-processing process prescription and conditions are as follows:

[0172] Prepare 1g / L glacial acetic acid and 1g / L soap detergent, the bath ratio between bedding fabric and dye solution is 1:8, and the specific post-treatment process is shown in the following change table:

[0173]

[0174] Among them, the vertical direction is the temperature change amplitude, and the horizontal direction is the duration change amplitude.

[0175] In this embodiment, the whole plant Apocynum venetum strips are used as raw materials to prepare the viscose-based Apocynum venetum fiber spinning solution with a cellulose type A mass fraction of up to 94.8%, thereby improving the utilization rate of the Apocynum venetum strips and the cellulose type A mass fraction, and effectively solving at least the following four problems existing in the conventional technology:

[0176] 1. The amount of outer fiber of Apocynum venetum is small, and the traditional process of preparing pulp as raw material makes the source of pulp raw material less;

[0177] 2. After the outer skin is removed by traditional technology, the hemp stalks will lose their industrial value and need further additional treatment;

[0178] 3. The penetrant added in the traditional process is organic, which makes water treatment difficult;

[0179] 4. The methyl fiber content of pulp prepared by traditional technology is too low.

[0180] The new technology has changed the current situation in which only discarded ramie skins and ramie stems are used in the existing technology, significantly reducing the waste of plant resources. No purification reagents need to be added during the preparation process, and the COD of the wastewater is between 33,000 mg / L and 40,000 mg / L, which not only reduces production costs but also reduces the difficulty of wastewater treatment.

[0181] In this embodiment, the relatively cheap plant thymol is preferably used as the antibacterial agent; in order to cleanly prepare viscose-based ramie antibacterial fibers, an improved green ionic liquid solvent is developed: a compound [Emim]DEP / DMSO is prepared, and the viscosity of the cellulose spinning solution system can be effectively reduced by the compound solvent, making it more suitable for microfluidic spinning; DMSO / [Emim]DEP / cellulose composite spinning solution is used as the cortex solution, and DMSO / [Emim]DEP / thymol mixed antibacterial solution is used as the core solution, and microfluidic technology is used to prepare functional fibers with a sheath-core structure, so that the antibacterial agent is coated inside the fiber, which can effectively reduce the loss of the antibacterial agent and further improve the washing fastness and antibacterial effect of the antibacterial viscose-based ramie fiber.

[0182] In this embodiment, the ionic liquid is recycled by vacuum distillation, which reduces energy consumption and avoids environmental problems caused by solvent emissions during the spinning process, which has important economic and environmental significance. Recyclability and recycling are major advantages of ionic liquids over traditional solvents.

[0183] In this embodiment, 14.69tex sheath-core structured antibacterial viscose-based ramie and viscose compact spinning blended yarn (30:70), 14.62tex sheath-core structured antibacterial viscose-based wool protein and combed cotton compact spinning blended yarn (60:40) and 14.58tex 100% combed cotton compact spinning yarn are weft-knitted with double rib structure to produce a composite warm, antibacterial, breathable and antistatic functional train bedding fabric.

[0184] Because the bedding fabric contains antibacterial viscose-based ramie fiber, the fabric has good antibacterial and UV protection properties; the presence of antibacterial viscose-based wool protein fiber enhances the antibacterial, moisture absorption, heat preservation and antistatic properties of the fabric; and the addition of combed cotton fiber makes the fabric soft, moisture absorption, breathable and comfortable to wear; at the same time, after weaving design and dyeing and finishing process, it further has mechanical properties such as friction resistance, washability, softness, bursting resistance and high breathability. The ramie fiber, amino acid and protein it contains give the fabric excellent antibacterial, moisture absorption, heat preservation and warmth preservation properties, as well as UV protection and antistatic properties, and can be effectively used in composite warm-keeping, antibacterial, breathable and antistatic functional bedding fabrics in autumn and winter.

[0185] Although the present invention has been described in detail above by general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A production process for antibacterial fiber bedding fabric based on microfluidic technology, characterized in that: The steps include: Preparation of viscose-based apocynum antibacterial fiber with skin-core structure based on microfluidic technology; Preparation of composite warm, antibacterial, breathable and antistatic functional bedding fabrics; Dyeing and finishing composite warm, antibacterial, breathable and antistatic functional bedding fabric.

2. The process for producing antibacterial fiber bedding fabric based on microfluidic technology according to claim 1 is characterized in that: The method for preparing the viscose-based apocynum ramie antibacterial fiber with a skin-core structure based on microfluidic technology specifically comprises: Preparation of viscose-based apocynum antibacterial fiber spinning solution; Preparation of ionic liquid solvents; Preparation of viscose-based apocynum ramie antibacterial fiber composite spinning solution for microfluidic technology; Preparation of viscose-based apocynum antibacterial fiber with skin-core structure by microfluidic technology; Recycling of ionic liquids.

3. The process for producing antibacterial fiber bedding fabric based on microfluidic technology according to claim 2 is characterized in that: The preparation of the viscose-based apocynum antibacterial fiber spinning solution specifically includes: Raw materials → preparation → cooking → washing → pulping → squeezing → alkali refining → washing → acid treatment → washing → hydrogen peroxide bleaching → sodium hypochlorite bleaching → acid treatment → washing → finished pulp; The raw material is a whole apocynum ramie branch, and the finished pulp is a viscose-based apocynum ramie spinning stock solution with a mass fraction of type A cellulose as high as 94.8%.

4. The process for producing antibacterial fiber bedding fabric based on microfluidic technology according to claim 3 is characterized in that: The steaming process specifically comprises: Prepare whole apocynum venetum branches as raw materials, cut the whole apocynum venetum branches into apocynum venetum strips with a length ranging from 3 to 5 cm to complete the material preparation; introduce a relative absolute dry pulp amount, that is, the ratio of the mass of the absolute dry part in the pulp to the mass of the total pulp; add 11% of sodium sulfide and 3.5% of sodium dodecylbenzene sulfonate to 33% of sodium hydroxide relative to the absolute dry pulp to prepare an alkali solution; Through the three factors and three levels of cooking orthogonal test, the optimal combination process parameters for large-scale production were obtained through limited number of tests. The prepared cut Apocynum venetum branches and the prepared alkali solution are placed in a digester for a cooking process, heated to 125°C for 25 minutes, with a pressure of 0.3MPa, and then steam is released, the steam release time is 10 minutes and the terminal pressure is set to 0.03MPa. After the first steam release is completed, the temperature is raised to 158°C for 28 minutes again, the pressure is 0.6MPa, and after keeping warm for 30 minutes, the second steam release is carried out, the steam release time is 8 minutes and the terminal pressure is set to 0.32MPa. After the steam release is completed, the temperature is raised to 158°C for 28 minutes again, the pressure is 0.65MPa, and after keeping warm for 95 minutes, the steam is released for the third time, and the terminal pressure is set to 0Mpa; The alkali refining process specifically includes: After the cooking process, the mass fraction of cellulose alpha (i.e., α-cellulose) in the pulp is 86% to 88%. The orthogonal test of alkali refining is carried out with three factors and three levels, namely, the mass concentration of refining alkali, the refining temperature, and the refining time, to obtain the optimal combined process parameters for large-scale production. Adding 33% of sodium hydroxide relative to the absolute dry pulp to carry out alkali refining process, the reaction time is 55min, and the mass fraction of type A cellulose in the pulp is increased to 92.2% to 94.8%; The bleaching process specifically comprises: The traditional bleaching process is to directly use sodium hypochlorite for bleaching, but the whiteness of the apocynum pulp after bleaching with sodium hypochlorite is relatively low. Therefore, after many tests, a two-stage bleaching process was adopted, that is, the first stage was bleached with hydrogen peroxide, and the second stage was bleached with sodium hypochlorite, and the whiteness of the pulp could be further improved by 7% to 8%; The optimal combination of process parameters for large-scale production was obtained by conducting a three-factor three-level hydrogen peroxide bleaching orthogonal test based on the hydrogen peroxide mass fraction, bleaching temperature and bleaching time. Specifically, 10% to 12% of sodium hydroxide relative to the absolute dry pulp amount is added to the bleaching tank to adjust the pulp pH value, and sodium silicate, magnesium sulfate and hydrogen peroxide are added in sequence for primary bleaching, the primary bleaching temperature is 80° C. to 90° C., the primary bleaching time is 80 min to 100 min, and then secondary bleaching is performed, sodium hypochlorite with an effective chlorine content of 10% is added, and the effective chlorine content in the pulp is maintained in the range of 0.35 g / L to 0.45 g / L, the free alkali range is 85 mg / L to 95 mg / L, the temperature range is controlled at 43° C. to 47° C., the bleaching time range is 95 min to 105 min, the residual chlorine range is 0.25 g / L to 0.35 g / L, and the residual alkali range is 75 mg / L to 80 mg / L; The pre-acid treatment step specifically includes: Add 0.1% to 0.15% oxalic acid relative to the absolute dry pulp amount, 0.3% to 0.5% sodium hexametaphosphate relative to the absolute dry pulp amount, then add 37% hydrochloric acid with a mass percentage concentration to adjust the acid content of the pulp to 0.3g / L to 0.9g / L, the acid treatment time ranges from 55min to 65min, and the temperature ranges from 65°C to 75°C; After the pre-acidification process, the ash mass fraction and iron content in the slurry are significantly reduced, and the acid-soluble impurities in the slurry are dissolved, which is more conducive to improving the whiteness of the slurry in the subsequent process, while reducing the consumption of bleaching chemicals.

5. The process for producing antibacterial fiber bedding fabric based on microfluidic technology according to claim 4 is characterized in that: The preparation of the ionic liquid solvent specifically includes: In order to cleanly prepare viscose-based apocynum venetum antibacterial fiber, an improved green ionic liquid solvent was designed to enable it to dissolve apocynum venetum cellulose and thymol antibacterial agent. Prepare 1-ethyl-3-methylimidazole diethyl phosphate ([Emim]DEP) solvent; Through nuclear magnetic hydrogen spectrum, infrared spectrum, electrospray mass spectrometry and water content characterization test analysis, imidazole cationic liquids containing allyl, butyl and ethyl functional groups and DEP anions with excellent solubility for keratin and cellulose natural products were selected. － , N-methylimidazole and triethyl phosphate in a molar ratio of 1:1.1 were placed in a container equipped with a condenser reflux tube, and magnetically stirred at 140°C for 12 hours, then cooled and placed in a separatory funnel, repeatedly washed with ethyl acetate, and continued to use a rotary evaporator to vacuum evaporate at 75°C for 2 hours, and finally fully dried in a vacuum drying oven at 80°C to synthesize the ionic liquid 1-ethyl-3-methylimidazole diethyl phosphate ([Emim]DEP) solvent through a one-step synthesis method; Compound [Emim]DEP / DMSO; Since the viscosity of the ionic liquid cellulose spinning solution is too high, it is difficult to pass through the channels and chips of the microfluidic spinning machine; therefore, 30% of the polar aprotic solvent DMSO was added to the [Emim]DEP solvent to prepare the [Emim]DEP / DMSO solvent. The viscosity of the cellulose spinning solution system was effectively reduced by the compounding solvent, making it more suitable for microfluidic spinning.

6. The process for producing antibacterial fiber bedding fabric based on microfluidic technology according to claim 5 is characterized in that: The preparation of the viscose-based apocynum antibacterial fiber composite spinning solution for microfluidic technology specifically includes: In order to improve the antibacterial effect and washing fastness of bedding, microfluidic technology is used to spin skin-core structure apocynum antibacterial fiber, that is, the antibacterial agent is coated inside the fiber to reduce the loss of the antibacterial agent. Prepare the cortical solution; The viscose-based apocynum ramie pulp prepared in the above-mentioned viscose-based apocynum ramie antibacterial fiber spinning solution preparation process is added to a DMSO / [Emim]DEP composite solution having a DMSO content of 30%, and heated to 55° C. and stirred for 1 hour to completely dissolve it, and finally a transparent DMSO / [Emim]DEP / cellulose composite spinning solution having a predetermined viscosity is obtained as the cortex spinning solution; preparing a core layer solution; A DMSO / [Emim]DEP composite solution with a DMSO content of 30% was used to dissolve a thymol extract of 1 / 4 of the mass of apocynum venetum pulp in a constant temperature water bath at 55°C, and the solution was allowed to stand for degassing until a clear and transparent DMSO / [Emim]DEP / thymol mixed antibacterial solution was obtained as the core layer mixed solution. The method of preparing the skin-core structured viscose-based apocynum antibacterial fiber by microfluidic technology specifically includes: Functionalized fibers with a skin-core structure are prepared by microfluidic technology, so that the antibacterial agent is coated inside the fiber to reduce the loss of the antibacterial agent; specifically, the prepared skin spinning solution and the core mixed solution are loaded into the first pump body and the second pump body of the microfluidic control, respectively, and further connected to the inner and outer channels of the Y-shaped coaxial microfluidic chip through a catheter, and then continue to enter the beaker containing deionized water as a coagulation bath from the Y-shaped coaxial microfluidic chip to form, and the flow rate ratio of the inner and outer phases is controlled to be 1:5, so that the microfluidic spinning process is smooth, and the obtained regenerated cellulose fiber maintains a smooth surface in both dry and wet states; The recycling of the ionic liquid specifically includes: The ionic liquid is recovered by vacuum distillation, specifically: The ionic liquid aqueous solution in the coagulation bath is collected, and the collected ionic liquid aqueous solution is heated and rotary evaporated at 75°C for 2 hours, and then placed in a vacuum drying oven at 80°C for a drying process of not less than 48 hours to remove the volatile components in the ionic liquid. The water content is then measured using a Karl Fischer titrator to ensure that the water content of the recovered ionic liquid is below 1000 ppm. The recovered ionic liquid is used again for the preparation of antibacterial fiber, and this operation is repeated to recycle the ionic liquid for not less than 5 times.

7. The process for producing antibacterial fiber bedding fabric based on microfluidic technology according to claim 6 is characterized in that: The preparation of the composite warm-keeping, antibacterial, breathable and antistatic functional bedding fabric specifically includes: The blending process of viscose-based apocynum antibacterial fiber and viscose fiber; Process for spinning blended yarn of viscose-based antibacterial wool protein fiber and combed cotton with core-skin structure; Weaving process of composite warm, antibacterial, breathable and antistatic functional bedding fabric.

8. The process for producing antibacterial fiber bedding fabric based on microfluidic technology according to claim 7 is characterized in that: The blended yarn process of the viscose-based apocynum antibacterial fiber and the viscose fiber specifically comprises: The obtained viscose-based apocynum antibacterial fiber with a core-skin structure and viscose fiber were fully and evenly mixed in a ratio of 30:70, and a three-pass drawing process was carried out. After that, a compact siro spinning device was equipped, and 14.69 tex blended yarn was obtained by compact siro spinning of coarse yarn and fine yarn. During the spinning process, the yarn evenness and average straightness of the apocynum fiber are controlled within a preset range to reduce accidental drafting during the spinning process; the center distance of the front middle roller is reduced so that the fiber speed change point is concentrated at the front jaw, which is more conducive to the stability of fiber speed change; the rubber ring jaw spacing is reduced according to the preset range, which is more conducive to reducing the unevenness of the drafting force and improving the yarn evenness; the small rear zone drafting multiple is set to strengthen the control of floating fibers, so as to delay the speed change of floating fibers, reduce the generation of hairiness, and improve the evenness of the yarn; The spinning process parameters are set as follows: roller center distance 42mm×50mm, rubber ring jaw spacing 3mm, total draft multiple 25, back zone draft multiple 1.07; in order to reduce spinning breakage and tension fluctuations, the spinning twist coefficient is selected as 350, the wire ring is selected as BS5 / 0, and the spindle speed is 11000r / min; considering that the moisture permeability of apocynum itself is strong and the difference between dry and wet strength is large, the temperature and humidity of the environment during the spinning process are controlled, and local ultrasonic atomization humidification is adopted, and the relative humidity range is controlled to 62%~65%, and the temperature range is controlled to 22~25℃; The process for spinning a blended yarn of viscose-based antibacterial wool protein fiber and combed cotton with a core-sheath structure specifically comprises: Viscose-based antibacterial wool protein fiber with a core-sheath structure was prepared by the same process as the antibacterial viscose-based apocynum fiber with a core-sheath structure, and the core-sheath viscose-based antibacterial wool protein fiber and combed cotton were fully and evenly mixed in a ratio of 60:40, and three-pass combined drawing process was implemented to blend roving and spun yarn (compact spinning) to obtain a blended yarn of 14.62 tex, the total drafting multiple of the spun yarn was 62 times, of which the drafting in the back zone was 1.5 times, the twist coefficient of the spun yarn was 350, and the twist was 950 twists / m; The weaving process of the composite warm-keeping, antibacterial, breathable and antistatic functional bedding fabric specifically comprises: The 14.69tex viscose-based antibacterial ramie and viscose compact spinning blended yarn in the ratio of 30:70, the 14.62tex viscose-based antibacterial wool protein and combed cotton compact spinning blended yarn in the ratio of 60:40, and the 4.58tex 100% combed cotton compact spinning yarn were interwoven, and a double rib structure was adopted to finally prepare a weft-knitted bedding fabric with a predetermined elasticity, and its final ratio parameter was set to a gram weight of 215g / m 2 , thickness 1.19mm, horizontal density 83 vertical rows / 5cm, vertical density 89 horizontal rows / 5cm, with antibacterial, moisture absorption and heat generation, warmth retention and UV protection properties.

9. The process for producing antibacterial fiber bedding fabric based on microfluidic technology according to claim 8, characterized in that: The dyeing and finishing process of the composite warm-keeping, antibacterial, breathable and antistatic functional bedding fabric specifically comprises: Blank fabric → pre-treatment → dyeing → post-treatment → dehydration → drying → pre-shrinking and shaping → testing → curling. Through dyeing and finishing treatment, the composite warmth-keeping, antibacterial, breathable and antistatic functions of bedding fabrics are further improved; The process temperature of the pre-shrinking and shaping is 170° C., the machine speed is 22 m / min, and the upper and lower air volumes are 100%.

10. The process for producing antibacterial fiber bedding fabric based on microfluidic technology according to claim 9, characterized in that: The specific prescription and conditions of the pre-treatment process are as follows: Prepare 3g / L cotton clean enzyme, 4g / L hydrogen peroxide, 1g / L glacial acetic acid, and the bath ratio between bedding fabric and dye solution is 1:

8. The specific pre-treatment process is shown in the following variation table: Among them, the vertical direction is the temperature change amplitude, and the horizontal direction is the duration change amplitude; The specific prescription and conditions of the dyeing process are as follows: Dyeing with reactive dyes in one bath and two steps using a normal temperature and pressure dyeing machine; 0.3% HB yellow, 1.95% HB red, 0.002% EC-R blue dye, 60g / L sodium sulfate, 22g / L soda ash, the bath ratio between bedding fabric and dye solution is 1:

8. The specific dyeing process is shown in the following variation table: Among them, the deoxygenase uses a concentration value that conforms to the existing standards, the vertical direction is the temperature change amplitude, the horizontal direction is the time change amplitude, and the dissolution time of the dye, sodium sulfate and soda ash is their respective corresponding dissolution time limits; The prescription and conditions of the post-processing process are as follows: Prepare 1g / L glacial acetic acid and 1g / L soap detergent, the bath ratio between bedding fabric and dye solution is 1:8, and the specific post-treatment process is shown in the following change table: Among them, the vertical direction is the temperature change amplitude, and the horizontal direction is the duration change amplitude.

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