Refining process of wide and thick silk satin

Abstract

Wide heavy silk satin refining process, belong to silk bleaching technical field. 1) soaking, 2) pretreatment, 3) preliminary refining, 4) refining, 5) washing, 6) pickling, 7) washing, 8) pH value adjustment;Step 2) pretreatment, 3) preliminary refining and 4) refining respectively adopt the way of soaking silk fabric in aqueous solution for treatment;The aqueous solution is aqueous solution of soda ash 5.5-7g / L, aminotri (methylene) phosphonic acid 5-19g / L, sodium hydrosulfite 0.5-1g / L, dispersing agent 2-14g / L, adjust the pH value of aqueous solution to 11-11.5, temperature 91-98℃, according to silk fabric and aqueous solution bath ratio 1:35-38, soak for 50-60 minutes;The wide heavy silk satin refining process has good gloss, brightness and hand feeling, and the refining is uniform, and the first success rate is high.

Description

Technical Field

[0001] The refining process for wide and heavy silk satin belongs to the field of silk bleaching and finishing technology. Background Technology

[0002] Silk fiber is an animal protein fiber, composed of two parts: an outer layer of sericin, made up of silk collagen, and an inner core of fibroin, made up of gelatinous protein. The presence of sericin causes silk fabrics to become dull and stiff, and can also negatively impact subsequent dyeing or printing processes. Therefore, it needs to be removed through scouring.

[0003] Scouring of silk fabrics refers to the process of removing natural impurities, stains, and degumming from silk fabrics using chemical and physical methods. After scouring, silk fabrics have a good luster and feel. For silk fabrics such as satin and silk, which are characterized by their strong luster, the scouring process is directly related to the style of the fabric and is therefore crucial. Furthermore, after scouring, silk fabrics are easier to dye in subsequent processes and have better print fastness. Therefore, whether the scouring process is thorough and uniform will also affect the effect of subsequent processes.

[0004] However, the applicant discovered the following problems with the existing technology during the research:

[0005] 1. Existing scouring processes result in silk fabrics with a dull luster and rough feel, a problem particularly pronounced when scouring high-luster silk fabrics. For example, satin and silk fabrics, which are characterized by their strong luster, exhibit unsatisfactory luster and hand feel after scouring, and this is quite noticeable.

[0006] 2. Wide and thick silk fabrics, due to their large area and thickness, are prone to uneven scouring in existing processes, resulting in a low success rate in the first scouring attempt. Uneven scouring refers to the phenomenon where sericin is lost in some areas of the silk fabric while remaining in others, creating a mottled distribution of degummed and raw silk areas, commonly known as "peanut-shaped" patterns. Current technology addresses this problem by re-scouring, which can easily lead to over-scouring of the degummed areas, damaging the silk fibers and causing abrasions, dust, and other problems, while also wasting time and water. Silk fiber itself is an expensive natural animal fiber, and silk fabrics are expensive. For example, a 30 momme, 1.6-meter wide silk crepe satin can cost as much as 250-300 yuan per meter. If uneven scouring occurs, the fabric's price after discounting may be less than 100 yuan per meter, or even unsellable and relegated to waste. If scouring goes wrong, often one or even several rolls of silk fabric will be affected, resulting in significant losses.

[0007] 3. Existing refining processes are inefficient and time-consuming. Current technologies mostly employ protease refining, but proteases cannot withstand high temperatures, making this method quite time-consuming. The protease degumming step alone takes 6-7 hours and is prone to incomplete or uneven degumming. In actual production, a second chemical degumming step is required, increasing the total degumming time to 7-8 hours. Adding pretreatment and washing processes further extends the time required. Currently, companies operate on an order-based production model, demanding high production efficiency within customer-specified timeframes, which existing refining processes cannot meet. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a wide and heavy silk satin scouring process. This wide and heavy silk satin scouring process has excellent luster, brightness and hand feel, and the scouring is uniform with a high success rate.

[0009] The technical solution adopted by the present invention to solve its technical problem is as follows: the wide and heavy silk satin refining process includes the following steps: 1) soaking, 2) pretreatment, 3) initial refining, 4) refining, 5) water washing, 6) acid washing, 7) water washing, 8) pH adjustment;

[0010] Steps 2) pretreatment, 3) initial scouring, and 4) refining involve soaking the silk fabric in an aqueous solution.

[0011] The aqueous solution is an aqueous solution of soda ash 5.5-7g / L, aminotrimethylenephosphonic acid 5-19g / L, sodium dithionite 0.5-1g / L, and dispersant 2-14g / L. The pH of the aqueous solution is adjusted to 11-11.5 and the temperature is 91-98℃. The silk fabric and the aqueous solution are soaked for 40-60 minutes at a bath ratio of 1:35-38.

[0012] Step 2) The specific operation of pretreatment is as follows: Prepare an aqueous solution of soda ash 5.5-5.7g / L, aminotrimethylenephosphonic acid 5-8g / L, sodium dithionite 0.5-0.6g / L, and dispersant 2-4g / L. Adjust the pH of the aqueous solution to 11-11.5 and the temperature to 91-93℃. Soak the silk fabric and the aqueous solution in a bath ratio of 1:35-38 for 40-45 minutes.

[0013] Step 3) The specific operation of the initial treatment is as follows: Prepare an aqueous solution of 6-6.5g / L soda ash, 14-19g / L aminotrimethylene phosphonic acid, 0.7-0.8g / L sodium dithionite, and 9-14g / L dispersant. Adjust the pH of the aqueous solution to 11-11.5 and the temperature to 95-98℃. Soak the silk fabric and the aqueous solution in a bath ratio of 1:35-38 for 50-60 minutes.

[0014] Step 4) The specific operation of refining is as follows: Prepare an aqueous solution of soda ash 5.5-5.7g / L, aminotrimethylenephosphonic acid 5-8g / L, sodium dithionite 0.5-0.6g / L, and dispersant 2-4g / L. Adjust the pH of the aqueous solution to 11-11.5 and the temperature to 94-95℃. Soak the silk fabric and the aqueous solution in a bath ratio of 1:35-38 for 50-60 minutes.

[0015] Step 1) The specific operation of soaking is as follows: Place the silk fabric on a star-shaped frame, immerse the silk fabric in water at 30-35℃, and then repeat the lifting and immersion operation 1-2 times, soaking for 30-40 minutes, and then lift it out of the water; immerse the silk fabric in water at 70-75℃, and then repeat the lifting and immersion operation 1-2 times, soaking for 30-40 minutes, and then lift it out of the water.

[0016] Step 1) involves hanging the silk fabric onto the star-shaped frame, at a rate of 400-500 meters per frame. Preferably, it is 400-450 meters per frame.

[0017] The dispersant mentioned in steps 2), 3) and 4) is WA-2 dispersant.

[0018] Step 5) The specific operation of water washing is as follows: the water temperature for the first water wash is 80-85℃, the water temperature for the second water wash is 70-75℃, and the water temperature for the third water wash is 60-65℃.

[0019] Step 5) The specific operation of water washing is as follows: Perform the first water wash, keep the water temperature at 80-85℃, repeatedly immerse and lift the silk fabric 2-3 times, and then soak for 10-15 minutes; then perform the second water wash, keep the water temperature at 70-75℃, repeatedly immerse and lift the silk fabric 2-3 times, and then soak for 10-15 minutes; then perform the third water wash, keep the water temperature at 60-65℃, repeatedly immerse and lift the silk fabric 2-3 times, and then soak for 10-15 minutes.

[0020] Step 6) The specific operation of acid washing is as follows: adjust the pH of the solution to 6-6.5, immerse the silk fabric in the solution, and let it stand for 20-25 minutes.

[0021] Step 7) The specific operation of water washing is as follows: keep the water temperature at 30-35℃, repeatedly immerse and lift the silk fabric 2-3 times, and then soak for 10-15 minutes; change the water and repeat 1-2 times.

[0022] Step 8) The specific operation for pH adjustment is as follows: heat the temperature to 40-45℃, adjust the pH of the solution to 9-9.5 with soda ash, immerse the silk fabric in the solution, soak for 30-40 minutes, then lift it up and roll it up.

[0023] Preferably, during the soaking process in step 3), circulating water is turned on in the solution at a flow rate of 2-3 m³ / h. Adding circulating water improves the degumming efficiency in step 3). The addition of circulating water allows the aminotrimethylene phosphonic acid, sodium dithionite, and dispersant in the scouring solution to continuously and evenly circulate between the silk fabrics, enabling impurities, sericin, waxes, and pigments from the scouring process to be removed from the silk fabric more effectively and quickly, thus improving degumming efficiency. A circulating water pump is installed at the bottom of the star-shaped scouring tank. The solution at the bottom of the star-shaped scouring tank is drawn by the circulating water pump and transported through pipelines to the top of the star-shaped scouring tank for discharge, completing the circulation of the solution from bottom to top within the star-shaped scouring tank.

[0024] The present invention is described as follows:

[0025] Step 1) involves lifting and immersing the silk fabric 40-60cm above the water, then lowering it again to immerse it completely. This lifting and immersion process washes away impurities from the silk fabric and fully soaks the silk fibers.

[0026] Step 1) Immersion refers to using a crane to submerge the silk fabric along with the star-shaped frame in water; Step 1) Lifting refers to using a crane to lift the star-shaped frame, thereby lifting the silk fabric along with it. The silk fabric is immersed and lifted in the washing tub of the star-shaped frame.

[0027] Step 1) Soaking can soften the silk fabric fibers. First, soak in water at 30-35℃, and then soak in water at a higher temperature of 70-75℃. This can effectively increase the penetration of the aqueous solution in steps 2)-4) into the silk fabric fibers and enhance the degumming effect.

[0028] Preferably, 2) Pretreatment: Prepare an aqueous solution of soda ash 5.5-5.7g / L, aminotrimethylenephosphonic acid 6-7g / L, sodium dithionite 0.5-0.6g / L, and dispersant 3-3.5g / L, adjust the pH of the aqueous solution to 11-11.5 and the temperature to 92.5-93℃, and soak the silk fabric and the aqueous solution in a bath ratio of 1:35-38 for 40-45 minutes;

[0029] Preferred, 3) Initial scouring: An aqueous solution of soda ash 6-6.5g / L, aminotrimethylenephosphonic acid 15-18g / L, sodium dithionite 0.7-0.8g / L, and dispersant 10-13g / L, adjust the pH of the aqueous solution to 11-11.5 and the temperature to 94.5-96.5℃, and soak the silk fabric and the aqueous solution in a bath ratio of 1:35-38 for 50-60 minutes;

[0030] Preferably, 4) Scouring: An aqueous solution of soda ash 5.5-5.7g / L, aminotrimethylenephosphonic acid 6-7g / L, sodium dithionite 0.5-0.6g / L, and dispersant 3.5-4g / L, adjust the pH of the aqueous solution to 11-11.5 and the temperature to 94.5-95℃, and soak the silk fabric and the aqueous solution in a bath ratio of 1:35-38 for 50-60 minutes.

[0031] The degree of sericin detachment depends on three processes: sericin absorbs water and swells in the scouring solution; during the swelling process, it dissolves under the catalysis of an alkaline reagent; and the sericin peels off from the fiber and disperses in the scouring solution.

[0032] In steps 2)-4), the present invention uses a novel auxiliary agent—aminotrimethylenephosphonic acid, in combination with a dispersant and temperature control, thereby reducing the binding of sericin and fibroin on silk fibers, so that the silk fabric is degummed quickly and evenly.

[0033] In step 1), the sericin absorbs water and swells. In step 2), an aqueous solution of 5.5-5.7 g / L soda ash, 5-8 g / L aminotrimethylene phosphonic acid, 0.5-0.6 g / L sodium dithionite, and 2-4 g / L dispersant is used to adjust the pH of the aqueous solution to 11-11.5 and the temperature to 91-93℃. The relatively low temperature and low concentration of aminotrimethylene phosphonic acid further swell the sericin and initially dissolve and loosen it.

[0034] Step 3) Initial scouring is the main process of degumming. High concentrations of aminotrimethylene phosphonic acid (ATPA), dispersants, and a relatively high temperature of 95-98℃ are used to promote sericin dissolution efficiency and scouring uniformity. ATP ensures thorough scouring of the silk fabric throughout, resulting in a rapid and uniform degumming process. The addition of the chelating agent ATP during the scouring process softens the water and reduces the calcium content. 2+ Mg 2+ Fe 3+ Metal ions have strong chelating power and scum dispersing ability, preventing precipitation during the bleaching process, the formation of dirt and other scum, and can slowly dissolve and remove silica scale, calcium soap precipitates and oligomers in the equipment, preventing metal salts from re-aggregating on various fibers, and improving bleaching, dyeing, whiteness, brightness and color fastness.

[0035] The applicant discovered that due to hard water issues, degumming with proteases is time-consuming, and the protein precipitate chelates and precipitates with ions in the water, accelerating scale formation. If deposited on silk fabrics, this affects the silk's luster; if deposited in the scouring tub, it leads to severe scale buildup and high cleaning costs. WA-2 dispersant, being a chelating dispersant, prevents the formation of water-soluble complexes between alkali and metal ions, thus more thoroughly removing metal ions contained in and attached to the fibers. Simultaneously, it chelates and disperses calcium and magnesium ions in the scouring solution, facilitating sericin removal and preventing insoluble calcium and magnesium salts from depositing on silk fabrics. This improves the wettability of scoured textiles, helping to improve the hand feel, whiteness, and luster of refined silk fabrics.

[0036] Step 4) The scouring aqueous solution is an aqueous solution of aminotrimethylenephosphonic acid 6-7 g / L, sodium dithionite 0.5-0.6 g / L, and dispersant 3.5-4 g / L. Adjust the pH of the aqueous solution to 11-11.5 and the temperature to 94.5-95℃. Soak the silk fabric and the aqueous solution in a bath ratio of 1:35-38 for 50-60 minutes. Use low concentrations of aminotrimethylenephosphonic acid and dispersant, and extend the soaking time at 94.5-95℃ to gently remove the sericin that was not removed in Step 3), promote uniform scouring, and avoid excessive degumming.

[0037] This invention aims to reduce uneven scouring and bleaching issues in silk fabrics by strictly controlling temperature and utilizing new auxiliaries, thereby ensuring uniform coloring. It more effectively reduces differences between the inside and outside, and between the top and bottom of the silk fabric, minimizing bleaching, scouring damage, stiffness, and incomplete washing. This ensures that every batch and every roll of silk fabric meets the same standard, shortening scouring time, increasing labor efficiency, and further reducing losses for customers caused by variations in roll size and color due to auxiliaries in the printing process. It also lays a solid foundation for the production of other wide and heavy silk fabrics.

[0038] Using the process of this invention, silk fabrics can effectively shorten the scouring time and the amount of auxiliaries used, and can more thoroughly remove the sericin and dirt remaining on the silk fabric after scouring. Through precise temperature control, the sericin, pigments and other substances in the silk fabric can be separated from the fibroin, effectively reducing the downgrading caused by abrasion and dust damage.

[0039] Step 8) pH adjustment makes the silk fabric slightly alkaline. A slightly alkaline silk fabric is beneficial for subsequent processing steps. If a printing process follows, the printing process has strict requirements on the pH of the silk fabric itself, usually controlled at a slightly alkaline pH of 9. The fixing conditions for reactive printing are alkaline, so baking soda needs to be added to the printing paste. If the pH of the silk fabric itself is too low and does not reach a slightly alkaline level, the acid-base neutralization during the printing steaming process can easily cause uneven coloring of the silk fabric under the printing coverage. If a dyeing process follows, when the silk fabric obtained by this invention is used as a dyed fabric, it is required that the silk fabric have as few defects as possible, such as gray marks and abrasions. Otherwise, the surface smoothness and brightness of the fabric after dyeing will be poor, affecting the overall effect of the silk surface. A slightly alkaline silk fabric increases the slipperiness of water, reduces friction between fabrics, effectively reduces the occurrence of gray marks, and thus ensures the bleaching quality of the product. Furthermore, reactive dyes, which dye under alkaline conditions, are commonly used in the dyeing of silk fabrics. This makes the silk fabric weakly alkaline, enhancing the bond between the silk and the dye, improving colorfastness, and preventing color variations. Silk fabrics treated with the process of this invention will exhibit improved colorfastness in subsequent dyeing or printing processes.

[0040] Steps 2)-4) and 6) use sodium hydroxide or acetic acid as pH adjusters. Sodium hydroxide is used to increase the pH, and acetic acid is used to decrease the pH. Step 8) Use soda ash to adjust the pH value.

[0041] Compared with the prior art, the beneficial effects of the present invention are:

[0042] 1. The scouring process for wide-width, heavy silk satin of this invention produces silk fabrics with excellent luster, brightness, and hand feel. Wide-width, heavy silk satin is often difficult to scour evenly and thoroughly. This invention can scour 30 momme wide, heavy silk satin up to 200cm in width. The scouring process for wide-width, heavy silk satin of this invention is suitable for scouring in hard water, solving the problem of dull silk luster caused by sedimentation during scouring. This invention is suitable for scouring high-luster silk fabrics, such as satin and silk fabrics, which are heavy, have a strong luster, and a silky feel. The process of this invention ensures that the scouring results in silk fabrics with excellent luster, brightness, and hand feel.

[0043] 2. The wide-width, heavy-duty silk satin scouring process of this invention achieves uniform scouring, a high success rate in a single scouring cycle, and a short processing time. The silk fabric produced by this process exhibits good permeability and uniform scouring. The high success rate of this invention in a single scouring cycle avoids the problems of uneven or insufficient scouring requiring rework, or over-scouring requiring repair, thus significantly improving production efficiency. The process is short, taking less than 3 hours, at least half the time compared to existing protease scouring methods. The process is suitable for continuous production in multiple batches, and the water used for washing and acid rinsing can be recycled, significantly reducing production costs and further shortening time while improving labor efficiency. Practice has proven that this technology is worth promoting, as its application helps enterprises complete orders on time and meets the needs of modern industrial production. Detailed Implementation

[0044] The present invention will be further described below with reference to specific embodiments, wherein Embodiment 1 is the preferred embodiment. The comparative examples are comparative embodiments designed to demonstrate the effects of the present invention.

[0045] The raw materials and additives used are as follows:

[0046] WA-2 dispersant is produced by Zhejiang Richeng New Material Technology Co., Ltd.

[0047] 630 detergent is produced by Zibo Hagen Textile Co., Ltd.

[0048] Step 1) The star-shaped frame used is a commercially available product, consisting of a star-shaped support with 12 spokes and a vertical cylindrical central axis. The star-shaped frame refining barrel is a stainless steel cylinder with a diameter of 1400cm and a depth of 2000cm, and incense-shaped steam pipes distributed at the bottom;

[0049] Steps 2)-4) and 6) use sodium hydroxide or acetic acid as pH adjusters. Use sodium hydroxide to adjust the pH to a value greater than 7, and use acetic acid to adjust the pH to a value less than 7. Step 8) Use soda ash to adjust the pH value.

[0050] The operations of the examples and comparative examples were conducted in Zibo City, Shandong Province, using hard water.

[0051] Example 1

[0052] The fabric used in this embodiment is 30m / m, 160cm wide pure silk crepe satin.

[0053] The refining process for wide-width, heavy silk satin in this embodiment employs the following steps:

[0054] 1) Soaking: Hang the silk fabric on a star-shaped rack, 450 meters / rack; immerse the silk fabric in 30℃ water, repeat the operation of lifting the silk fabric 60cm out of the water and lowering it into the water twice, then soak for 30 minutes, then lift it out of the water; immerse the silk fabric in 75℃ water, repeat the operation of lifting the silk fabric 60cm out of the water and lowering it into the water twice, then let it stand and soak for 40 minutes, then lift it out of the water;

[0055] 2) Pretreatment: Prepare an aqueous solution of 5.7 g / L soda ash, 7 g / L aminotrimethylene phosphonic acid, 0.6 g / L sodium dithionite, and 3.5 g / L WA-2 dispersant. Adjust the pH of the aqueous solution to 11 and the temperature to 93℃. Soak the silk fabric and the aqueous solution in a bath ratio of 1:36 for 45 minutes.

[0056] 3) Initial treatment: Prepare an aqueous solution of 6.5 g / L soda ash, 18 g / L aminotrimethylene phosphonic acid, 0.7 g / L sodium dithionite, and 13 g / L WA-2 dispersant. Adjust the pH of the aqueous solution to 11.5 and the temperature to 94.5℃. Soak the silk fabric in the solution for 60 minutes at a ratio of 1:38. During the soaking process, keep the circulating water in the solution running at a flow rate of 3 m³ / h.

[0057] 4) Refining: Aqueous solution of soda ash 5.5g / L, aminotrimethylene phosphonic acid 6g / L, sodium dithionite 0.5g / L, and WA-2 dispersant 3.5g / L, adjust the pH of the aqueous solution to 11 and the temperature to 94.5℃, and soak the silk fabric in the aqueous solution at a ratio of 1:37 for 50 minutes.

[0058] 5) Washing: Perform the first wash at a water temperature of 85℃, repeatedly immersing and lifting the silk fabric three times, then soaking for 15 minutes; then perform the second wash at a water temperature of 75℃, repeatedly immersing and lifting the silk fabric twice, then soaking for 10 minutes; then perform the third wash at a water temperature of 60℃, repeatedly immersing and lifting the silk fabric three times, then soaking for 15 minutes.

[0059] 6) Pickling: Adjust the pH of the solution to 6.5 with acetic acid, immerse the silk fabric in the solution, and let it stand for 25 minutes;

[0060] 7) Washing: Keep the water temperature at 30℃, repeatedly immerse and lift the silk fabric twice, then soak for 15 minutes; change the water and repeat step 7) once.

[0061] 8) pH adjustment: Heat to 45℃, adjust the pH of the solution to 9.5 with soda ash, immerse the silk fabric in the solution, soak for 30 minutes, then lift and roll it up.

[0062] Example 2

[0063] The fabric used in this embodiment is 30m / m, 160cm wide pure silk crepe satin.

[0064] The refining process for wide-width, heavy silk satin in this embodiment employs the following steps:

[0065] 1) Soaking: Hang the silk fabric on a star-shaped rack, 400 meters / rack; immerse the silk fabric in 35℃ water, lift the silk fabric 40cm out of the water and lower it back into the water once, then soak for 40 minutes, then lift it out of the water; immerse the silk fabric in 70℃ water, lift the silk fabric 40cm out of the water and lower it back into the water once, then let it stand and soak for 30 minutes, then lift it out of the water.

[0066] 2) Pretreatment: Prepare an aqueous solution of 5.5 g / L soda ash, 6 g / L aminotrimethylene phosphonic acid, 0.5 g / L sodium dithionite, and 3 g / L WA-2 dispersant. Adjust the pH of the aqueous solution to 11.5 and the temperature to 92.5℃. Soak the silk fabric in the aqueous solution at a ratio of 1:38 for 40 minutes.

[0067] 3) Initial preparation: Prepare an aqueous solution of 6 g / L soda ash, 15 g / L aminotrimethylene phosphonic acid, 0.8 g / L sodium dithionite, and 10 g / L WA-2 dispersant. Adjust the pH of the aqueous solution to 11 and the temperature to 96.5℃. Soak the silk fabric in the solution at a ratio of 1:35 for 50 minutes. During the soaking process, keep the circulating water in the solution running at a flow rate of 3 m³ / h.

[0068] 4) Refining: Aqueous solution of soda ash 5.7g / L, aminotrimethylene phosphonic acid 7g / L, sodium dithionite 0.6g / L, and WA-2 dispersant 4g / L, adjust the pH of the aqueous solution to 11.5 and the temperature to 95℃, and soak the silk fabric in the aqueous solution at a ratio of 1:35 for 40 minutes.

[0069] 5) Washing: Perform the first wash at 80℃, repeatedly immersing and lifting the silk fabric twice, then soaking for 10 minutes; then perform the second wash at 70℃, repeatedly immersing and lifting the silk fabric three times, then soaking for 15 minutes; then perform the third wash at 65℃, repeatedly immersing and lifting the silk fabric three times, then soaking for 10 minutes.

[0070] 6) Pickling: Adjust the pH of the solution to 6 with acetic acid, immerse the silk fabric in the solution, and let it stand for 20 minutes;

[0071] 7) Washing: Keep the water temperature at 35℃, repeatedly immerse and lift the silk fabric 3 times, then soak for 10 minutes; change the water and repeat step 7) twice.

[0072] 8) pH adjustment: Heat to 40℃, adjust the pH of the solution to 9 with soda ash, immerse the silk fabric in the solution, soak for 40 minutes, then lift and roll it up.

[0073] Example 3

[0074] The fabric used in this embodiment is 23m / m, 200cm wide pure silk crepe satin.

[0075] The refining process for wide-width, heavy silk satin in this embodiment employs the following steps:

[0076] 1) Soaking: Hang the silk fabric on a star-shaped rack, 420 meters / rack; immerse the silk fabric in 32℃ water, repeat the operation of lifting the silk fabric 45cm out of the water and lowering it into the water twice, then soak for 30 minutes, then lift it out of the water; immerse the silk fabric in 70℃ water, repeat the operation of lifting the silk fabric 45cm out of the water and lowering it into the water twice, then let it stand and soak for 40 minutes, then lift it out of the water;

[0077] 2) Pretreatment: Prepare an aqueous solution of 5.6 g / L soda ash, 8 g / L aminotrimethylene phosphonic acid, 0.5-0.6 g / L sodium dithionite, and 4 g / L WA-2 dispersant. Adjust the pH of the aqueous solution to 11.3 and the temperature to 91℃. Soak the silk fabric in the aqueous solution at a ratio of 1:35 for 40 minutes.

[0078] 3) Initial soaking: Prepare an aqueous solution of 6.5 g / L soda ash, 19 g / L aminotrimethylenephosphonic acid, 0.7-0.8 g / L sodium dithionite, and 14 g / L WA-2 dispersant. Adjust the pH of the aqueous solution to 11.3 and the temperature to 95℃. Soak the silk fabric in the solution for 50 minutes at a ratio of 1:35. During the soaking process, keep the circulating water in the solution running at a flow rate of 3 m³ / h.

[0079] 4) Refining: Prepare an aqueous solution of soda ash 5.7g / L, aminotrimethylenephosphonic acid 5g / L, sodium dithionite 0.5g / L, and WA-2 dispersant 2g / L. Adjust the pH of the aqueous solution to 11.3 and the temperature to 94℃. Soak the silk fabric in the aqueous solution at a ratio of 1:35 for 5 minutes.

[0080] 5) Washing: Perform the first wash at 80℃, repeatedly immersing and lifting the silk fabric three times, then soaking for 15 minutes; then perform the second wash at 75℃, repeatedly immersing and lifting the silk fabric twice, then soaking for 15 minutes; then perform the third wash at 60℃, repeatedly immersing and lifting the silk fabric three times, then soaking for 10 minutes.

[0081] 6) Pickling: Adjust the pH of the solution to 6.5 with acetic acid, immerse the silk fabric in the solution, and let it stand for 25 minutes;

[0082] 7) Washing: Keep the water temperature at 30℃, repeatedly immerse and lift the silk fabric twice, then soak for 15 minutes; change the water and repeat step 7) twice.

[0083] 8) pH adjustment: Heat to 45℃, adjust the pH of the solution to 9.4 with soda ash, immerse the silk fabric in the solution, soak for 30-40 minutes, then lift and roll it up.

[0084] Example 4

[0085] The fabric used in this embodiment is 30m / m, 200cm wide pure silk crepe satin.

[0086] The refining process for wide-width, heavy silk satin in this embodiment employs the following steps:

[0087] 1) Soaking: Hang the silk fabric on a star-shaped rack, 500 meters / rack; immerse the silk fabric in 35℃ water, repeat the operation of lifting the silk fabric 50cm out of the water and lowering it into the water twice, then soak for 40 minutes, then lift it out of the water; immerse the silk fabric in 75℃ water, repeat the operation of lifting the silk fabric 50cm out of the water and lowering it into the water twice, then let it stand and soak for 30 minutes, then lift it out of the water;

[0088] 2) Pretreatment: Prepare an aqueous solution of soda ash 5.5-5.7g / L, aminotrimethylenephosphonic acid 5g / L, sodium dithionite 0.6g / L, and WA-2 dispersant 2g / L. Adjust the pH of the aqueous solution to 11.2 and the temperature to 93℃. Soak the silk fabric and the aqueous solution in a bath ratio of 1:38 for 45 minutes.

[0089] 3) Initial soaking: Prepare an aqueous solution of 6 g / L soda ash, 14 g / L aminotrimethylenephosphonic acid, 0.7 g / L sodium dithionite, and 9 g / L WA-2 dispersant. Adjust the pH of the aqueous solution to 11.2 and the temperature to 98℃. Soak the silk fabric in the solution for 60 minutes at a ratio of 1:38. During the soaking process, turn on the circulating water in the solution at a flow rate of 3 m³ / h.

[0090] 4) Refining: Aqueous solution of soda ash 5.5g / L, aminotrimethylene phosphonic acid 8g / L, sodium dithionite 0.6g / L, and WA-2 dispersant 4g / L, adjust the pH of the aqueous solution to 11.2 and the temperature to 95℃, and soak the silk fabric in the aqueous solution at a ratio of 1:38 for 60 minutes.

[0091] 5) Washing: Perform the first wash at 85℃, repeatedly immersing and lifting the silk fabric 2-3 times, then soaking for 10 minutes; then perform the second wash at 70℃, repeatedly immersing and lifting the silk fabric 2 times, then soaking for 10 minutes; then perform the third wash at 65℃, repeatedly immersing and lifting the silk fabric 2 times, then soaking for 15 minutes.

[0092] 6) Pickling: Adjust the pH of the solution to 6 with acetic acid, immerse the silk fabric in the solution, and let it stand for 25 minutes;

[0093] 7) Washing: Keep the water temperature at 35℃, repeatedly immerse and lift the silk fabric 3 times, then soak for 10 minutes; change the water and repeat step 7) twice.

[0094] 8) pH adjustment: Heat to 42℃, adjust the pH of the solution to 9.3 with soda ash, immerse the silk fabric in the solution, soak for 30-40 minutes, then lift and roll it up.

[0095] Comparative Example 1

[0096] The preparation method of this comparative example is the same as that of Example 1, except that step 2) pretreatment was not performed.

[0097] Comparative Example 2

[0098] The preparation method of this comparative example is the same as that of Example 1, except that step 4) refining is not performed.

[0099] Comparative Example 3

[0100] The preparation method of this comparative example is the same as that of Example 1, except that step 3) initial refining is not performed. Instead, after step 2), step 4) refining is performed, and then step 4) is repeated once.

[0101] Comparative Example 4

[0102] The preparation method of this comparative example is the same as that of Example 1, except that the aminotrimethylenephosphonic acid in steps 2)-4) is replaced with sodium metasilicate Na2SiO3.

[0103] 2) Pretreatment: Prepare an aqueous solution of soda ash 5.5-5.7g / L, sodium metasilicate 2.8g / L, sodium dithionite 0.5-0.6g / L, and WA-2 dispersant 3-3.5g / L. Adjust the pH of the aqueous solution to 11-11.5 and the temperature to 92.5-93℃. Soak the silk fabric and the aqueous solution in a bath ratio of 1:35-38 for 40-45 minutes.

[0104] 3) Initial preparation: Prepare an aqueous solution of soda ash 6-6.5g / L, sodium metasilicate 4.5g / L, sodium dithionite 0.7-0.8g / L, and WA-2 dispersant 10-13g / L. Adjust the pH of the aqueous solution to 11-11.5 and the temperature to 94.5-96.5℃. Soak the silk fabric in the solution for 50-60 minutes at a ratio of 1:35-38.

[0105] 4) Refining: Prepare an aqueous solution of soda ash 5.5-5.7g / L, sodium metasilicate 3.5g / L, sodium dithionite 0.5-0.6g / L, and WA-2 dispersant 3.5-4g / L. Adjust the pH of the aqueous solution to 11-11.5 and the temperature to 94.5-95℃. Soak the silk fabric in the aqueous solution at a ratio of 1:35-38 for 40-60 minutes.

[0106] Comparative Example 5

[0107] The preparation method of this comparative example is the same as that of Example 1, except that the WA-2 dispersant in steps 2)-4) is replaced with the same amount of 630 detergent.

[0108] Performance testing

[0109] The scouring process for wide-width, heavy silk satin obtained in the examples and comparative examples was tested using the following methods:

[0110] Test 1: Experienced inspectors visually inspect the goods to determine if there are any issues with uneven refining or over-refining. If no issues are found, the refining is considered successful on the first attempt. Uneven refining requires repeating the refining process, while over-refining requires using a repair agent to correct it. Each example or comparative example processes 100 horsepower.

[0111] Success rate of one refinement = (Number of horses successfully refined in one refinement / Total number of horses) × 100%.

[0112] Test 2: Permeability, using the national standard GB / T15552-2007 Test Methods and Inspection Rules for Silk Fabrics. Fabric permeability ranges from 1 to 14, with higher numbers indicating better permeability.

[0113] Test 3: Gloss, brightness, and feel. All of these were inspected by inspectors. Each piece of silk fabric was sampled and tested by visual observation and tactile examination, and the results were recorded.

[0114] Test 4: Record the processing time for each piece of fabric and calculate the average.

[0115] Table 1. Test results for examples and comparative examples.

[0116] .

[0117] Table 1 shows that the processes in Examples 1-4 result in silk fabrics with a high success rate in one-time scouring, reducing the need for rework. Upon inspection by experienced inspectors, no excessive degumming requiring repair occurred. The total time for steps 2)-4) of degumming in Examples 1-4 is less than 3 hours, significantly improving efficiency compared to protease degumming. The resulting silk fabrics exhibit good permeability, demonstrating uniform degumming. The silk fabrics obtained in Examples 1-4 have a soft hand feel, a gentle luster, and a pure brightness, possessing the unique sheen of silk.

[0118] Comparative Example 1 underwent pretreatment in step 2); Comparative Example 2 did not undergo scouring in step 4); Comparative Example 3 underwent initial scouring in step 3), but instead underwent scouring in step 4) after step 2), and then repeated step 4) once. The final silk fabric obtained after one scouring process did not have the same yield and luster as the examples.

[0119] In Comparative Example 4, the aminotrimethylenephosphonic acid in steps 2)-4) was replaced with sodium metasilicate (Na2SiO3), but the degumming effect was not good.

[0120] In Comparative Example 5, the dispersant was replaced, and the silk fibroin was severely deposited and adhered to the silk fibers, resulting in a dull silk fabric with poor luster.

[0121] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A refining process for wide-width, heavy silk satin, characterized by: The process includes the following steps: 1) soaking, 2) pretreatment, 3) initial refining, 4) refining, 5) washing, 6) acid washing, 7) washing, and 8) pH adjustment. Step 2) The specific operation of pretreatment is as follows: Prepare an aqueous solution of soda ash 5.5-5.7g / L, aminotrimethylenephosphonic acid 5-8g / L, sodium dithionite 0.5-0.6g / L, and dispersant 2-4g / L. Adjust the pH of the aqueous solution to 11-11.5 and the temperature to 91-93℃. Soak the silk fabric and the aqueous solution in a bath ratio of 1:35-38 for 40-45 minutes. Step 3) The specific operation of the initial treatment is as follows: Prepare an aqueous solution of 6-6.5g / L soda ash, 14-19g / L aminotrimethylenephosphonic acid, 0.7-0.8g / L sodium dithionite, and 9-14g / L dispersant. Adjust the pH of the aqueous solution to 11-11.5 and the temperature to 95-98℃. Soak the silk fabric and the aqueous solution in a bath ratio of 1:35-38 for 50-60 minutes. Step 4) The specific operation of refining is as follows: Prepare an aqueous solution of soda ash 5.5-5.7g / L, aminotrimethylenephosphonic acid 5-8g / L, sodium dithionite 0.5-0.6g / L, and dispersant 2-4g / L. Adjust the pH of the aqueous solution to 11-11.5 and the temperature to 94-95℃. Soak the silk fabric and the aqueous solution in a bath ratio of 1:35-38 for 50-60 minutes. Step 1) The specific soaking operation is as follows: Place the silk fabric on a star-shaped frame, immerse the silk fabric in water at 30-35℃, and then repeat the lifting and immersion operation 1-2 times, soaking for 30-40 minutes, and then lift it out of the water; immerse the silk fabric in water at 70-75℃, and then repeat the lifting and immersion operation 1-2 times, soaking for 30-40 minutes, and then lift it out of the water; The dispersant mentioned in steps 2), 3), and 4) is WA-2 dispersant; Step 5) The specific operation of water washing is as follows: the water temperature for the first water wash is 80-85℃, the water temperature for the second water wash is 70-75℃, and the water temperature for the third water wash is 60-65℃.

2. The refining process for wide-width, heavy silk satin according to claim 1, characterized in that: Step 1) The specific operation of placing the silk fabric on the star-shaped frame is to hang the silk fabric on the star-shaped frame, 400-500 meters / frame.

3. The refining process for wide-width, heavy silk satin according to claim 1, characterized in that, Step 5) The specific operation of water washing is as follows: Perform the first water wash, keep the water temperature at 80-85℃, repeatedly immerse and lift the silk fabric 2-3 times, and then soak for 10-15 minutes; then perform the second water wash, keep the water temperature at 70-75℃, repeatedly immerse and lift the silk fabric 2-3 times, and then soak for 10-15 minutes; then perform the third water wash, keep the water temperature at 60-65℃, repeatedly immerse and lift the silk fabric 2-3 times, and then soak for 10-15 minutes.

4. The refining process for wide-width, heavy silk satin according to claim 1, characterized in that, Step 6) The specific operation of acid washing is as follows: adjust the pH of the solution to 6-6.5, immerse the silk fabric in the solution, and let it stand for 20-25 minutes.

5. The refining process for wide-width, heavy silk satin according to claim 1, characterized in that, Step 7) The specific operation of water washing is as follows: keep the water temperature at 30-35℃, repeatedly immerse and lift the silk fabric 2-3 times, and then soak for 10-15 minutes; change the water and repeat 1-2 times.

6. The refining process for wide-width, heavy silk satin according to claim 1, characterized in that, Step 8) The specific operation for pH adjustment is as follows: heat the temperature to 40-45℃, adjust the pH of the solution to 9-9.5 with soda ash, immerse the silk fabric in the solution, soak for 30-40 minutes, then lift it up and roll it up.