A sizing additive for preventing sizing pick-up on denim yarn

Abstract

The application discloses a sizing additive for preventing sizing color absorption of jean yarns. The sizing additive for preventing sizing color absorption of jean yarns comprises the following components in mass fraction: 10-20% of polyacrylamide, 5-10% of water-based polyester, 35-45% of fatty alcohol polyoxyethylene ether 1 and 35-45% of fatty alcohol polyoxyethylene ether 2; the fatty alcohol polyoxyethylene ether 1 is cetyl stearyl alcohol polyether, and the molecular formula is C 12 H 25 O(CH2CH2O)3H; the fatty alcohol polyoxyethylene ether 2 has the molecular formula of RO(CH2CH2O) 30 H, R=C 12 H 25 ~C 118 H 37 By adding the sizing additive, various problems caused by deep sizing color can be effectively solved, the service life of the sizing additive is prolonged, waste of the sizing additive, time and steam caused by replacement of the sizing additive are reduced, sewage discharge of sizing enterprises is reduced, and the sizing of jeans is more energy-saving and environment-friendly.

Description

Technical Field

[0001] This invention relates to the field of denim yarn processing technology, and in particular to a sizing additive that prevents denim yarn from absorbing color during sizing. Background Technology

[0002] Denim clothing, with its unique distressed style, has always been popular with consumers. The formation of a denim garment requires dozens of processes, among which sizing is the foundation of denim fabric formation and a key aspect of denim production. The quality of the sizing directly affects the smooth progress of manufacturing and the quality of the fabric surface, therefore, the sizing process has always received much attention.

[0003] Because the sizing process for denim yarn is a continuous production process, the yarn is dyed and then sized, inevitably transferring the yarn's color to the sizing agent. Over time, the sizing agent's color deepens. If the sizing agent is too dark, it not only affects the yarn's luster but also causes the denim fabric to develop a bluish tint and unclear texture during subsequent washing, significantly reducing fabric quality. Currently, the common practice in factories is to change the sizing agent promptly to avoid the problems caused by excessively dark sizing. However, this method is time-consuming and labor-intensive, wasting a large amount of sizing agent and increasing costs significantly. Summary of the Invention

[0004] The purpose of this invention is to provide a sizing additive (HS-120) to prevent dye absorption by denim yarn. By adding HS-120 to denim sizing, the color in the sizing is firstly prevented from being re-dyed onto the yarn, thus changing the yarn's hue. Secondly, it prevents the indigo in the sizing from being re-dyed onto the weft during subsequent washing. This effectively solves the problem of excessively dark sizing, extends the sizing's lifespan, reduces wastewater discharge from sizing companies, and makes denim sizing more energy-efficient and environmentally friendly.

[0005] This invention is achieved through the following technical solutions:

[0006] A sizing additive for preventing dye absorption by denim yarn, comprising, by mass fraction: 10%–20% polyacrylamide, 5%–10% waterborne polyester, 35%–45% fatty alcohol polyoxyethylene ether 1, and 35%–45% fatty alcohol polyoxyethylene ether 2; wherein the fatty alcohol polyoxyethylene ether 1 is cetearyl alcohol polyether, and its molecular formula is C 12 H 25 O(CH2CH2O)3H; the molecular formula of the fatty alcohol polyoxyethylene ether 2 is RO(CH2CH2O). 30 H, R=C 12 H 25 ~ C 18 H 37 .

[0007] Preferably, the slurry additive comprises, by mass fraction, the following components: 15% polyacrylamide, 5% waterborne polyester, 40% fatty alcohol polyoxyethylene ether 1 and 40% fatty alcohol polyoxyethylene ether 2.

[0008] Preferably, the waterborne polyester is polyethylene terephthalate modified with polyethylene glycol, wherein polyethylene glycol (PEG6000) accounts for 88% and polyethylene terephthalate (PET) accounts for 12%.

[0009] The present invention also protects the preparation method of the slurry additive, comprising the following steps: sequentially melting and mixing polyacrylamide, waterborne polyester, fatty alcohol polyoxyethylene ether 1 and fatty alcohol polyoxyethylene ether 2 to obtain the slurry additive.

[0010] This invention also protects the application of the sizing additive in the denim yarn sizing process. After the denim sizing is boiled, the sizing additive HS-120 is added and stirred evenly before use. This effectively prevents the color in the sizing from being re-dyed onto the yarn, changes the yarn's hue, prevents the indigo in the sizing from dyeing back onto the weft during subsequent washing, extends the sizing's lifespan, reduces wastewater discharge from sizing companies, and makes denim sizing more energy-efficient and environmentally friendly.

[0011] This invention also protects a denim yarn sizing agent, including the aforementioned sizing additive. The sizing additive HS-120 has good compatibility with the sizing agent, and the viscosity, adhesion, yarn sizing rate, abrasion resistance, breaking strength, and hair reduction rate of the sizing agent HS-120 are maintained within ±2% after adding HS-120.

[0012] Preferably, the amount of the slurry additive added is 2~10 g / L, based on the volume of the slurry.

[0013] Further preferred, based on the volume of the slurry, the amount of the slurry additive added is 2~6 g / L.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. The sizing additive proposed in this invention can effectively prevent the color in the sizing from being dyed onto the yarn a second time, thus preventing changes in the yarn's color and ensuring the stability of the yarn's color.

[0016] 2. The sizing additive proposed in this invention can effectively prevent the indigo in the sizing from returning to the weft threads during the subsequent washing process, thus preventing the fabric from turning blue and the texture from becoming unclear.

[0017] 3. The sizing additive HS-120 proposed in this invention has good compatibility with sizing agents. The viscosity and adhesion of the sizing agent HS-120, as well as the changes in the sizing rate, abrasion resistance, breaking strength, and hair reduction rate of the yarn, are maintained within ±2%.

[0018] 4. The addition of HS-120 sizing additive in this invention can effectively solve various problems caused by excessively dark sizing color, extend the service life of sizing, reduce the waste of sizing, time and steam caused by replacing sizing, and reduce the wastewater discharge of sizing enterprises, making denim sizing more energy-saving and environmentally friendly. Attached Figure Description

[0019] Figure 1 This is a comparison table of yarn color changes after desizing in Example 1, where the left figure shows the color of the sized yarn and the right figure shows the color of the desized yarn.

[0020] Figure 2 This is a comparison table of yarn color changes after desizing in Example 2, where the left figure shows the color of the sized yarn and the right figure shows the color of the desized yarn.

[0021] Figure 3 This is a comparison table of yarn color changes after desizing in Example 3, where the left figure shows the color of the sized yarn and the right figure shows the color of the desized yarn.

[0022] Figure 4 This is a comparison table of yarn color changes after desizing, as shown in Comparative Example 1. The left figure represents the color of the sized yarn, and the right figure represents the color of the desized yarn.

[0023] Figure 5 The table below shows the color changes of yarn after desizing, as shown in Comparative Example 2. The left figure represents the color of the sized yarn, and the right figure represents the color of the desized yarn.

[0024] Figure 6 The table below shows the color changes of yarn after desizing, as shown in Comparative Example 3. The left figure represents the color of the sized yarn, and the right figure represents the color of the desized yarn.

[0025] Figure 7 This is a comparison table of yarn color changes after desizing, as shown in Comparative Example 5. The left figure represents the color of the sized yarn, and the right figure represents the color of the desized yarn.

[0026] Figure 8 The table below shows the color changes of yarn after desizing, as shown in Comparative Example 6. The left figure represents the color of the sized yarn, and the right figure represents the color of the desized yarn. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the embodiments. These embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Experimental methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions in the art or as recommended by the manufacturer; the raw materials and reagents used, unless otherwise specified, are considered to be commercially available through conventional markets. The fatty alcohol polyoxyethylene ether 2 proposed in this invention was purchased from Haian Petrochemical Plant in Jiangsu Province, and its molecular formula is RO(CH2CH2O). 30 H, R=C 12 H 25 ~C 18 H 37 .

[0028] Example 1 (Slurry Additive HS-120 2 g / L)

[0029] Yarn sizing: Take a bundle of pure cotton white yarn (58.3 tex, 30 cm long, 5 g in weight), immerse it in 200 mL of an aqueous solution containing 20 g / L NaOH and 10 g / L JFC (JFC penetrant, full name is fatty alcohol polyoxyethylene ether) for 30 seconds, remove it, rinse it with 200 mL of clean water for 10 seconds, and then dry it. Sizing is then performed in a sizing agent containing indigo and HS-120. After sizing, lay it flat and bake it at 105℃ for 30 minutes, then observe the color of the yarn. The sizing process for the sizing material containing indigo and HS-120 is as follows: Prepare 200 mL of 7% (by mass) sizing solution (60% corn starch + 40% PVA), place it on a magnetic stirrer, and heat it to boiling while stirring. Add 2 g / L of HS-120, and maintain the temperature above 98℃ for 30 min to fully cook the sizing solution. Then add 8 g of indigo dye reducing solution (21 g / L indigo, 21 g / L NaOH, 31.5 g / L Na2S2O4, 1.2 g / L Na2CO3, 1.8 g / L NaCl, and 2.4 g / L JFC), heat and stir, and add water to maintain the solid content until the indigo is completely oxidized. The sizing process is a three-dip, three-roll process, with the first rolling pressure at 0.4 MPa, the second rolling pressure at 0.4 MPa, and the third rolling pressure at 0.25 MPa. The formulation of the auxiliary agent (slurry additive) HS-120 is as follows (by mass fraction): 15% polyacrylamide, 5% polyethylene glycol-modified polyethylene terephthalate, 40% fatty alcohol polyoxyethylene ether 1, and 40% fatty alcohol polyoxyethylene ether 2. Fatty alcohol polyoxyethylene ether 1 is cetearyl alcohol polyether, with the molecular formula C... 12 H 25 The molecular formula of fatty alcohol polyoxyethylene ether 2 is C(CH2CH2O)3H. 18 H 37 O(CH2CH2O)30 H.

[0030] Yarn desizing: Soak the dried yarn in 200 mL of a solution containing 2 g / L desizing enzyme at 60℃ for 10 min, then rinse it twice with 200 mL of water for 10 s each time, remove it, dry it, and observe and measure the color of the yarn.

[0031] Example 2 (HS-120 4 g / L)

[0032] Referring to Example 1, the difference is that the amount of additive HS-120 added is 4 g / L.

[0033] Example 3 (HS-120 6 g / L)

[0034] Referring to Example 1, the difference is that the amount of additive HS-120 added is 6 g / L.

[0035] Example 4 (factory sizing 4 g / L) Experiment

[0036] HS-120 was used on a combined sizing and dyeing machine. The sizing length was 10,000 meters, the solids content of the sizing agent was 7%, the temperature of the sizing tank was 98℃, and the pressures of the three sizing rollers were 0.04 MPa, 0.04 MPa, and 0.25 MPa respectively. The sizing speed was 28 m / min. After the sizing agent was boiled, HS-120 was added to the boiling tank at a dosage of 4 g / L, stirred evenly, and allowed to stand for 30 minutes before use.

[0037] Example 5 (HS-120 4 g / L)

[0038] Referring to Example 2, the difference is that the formulation of the additive (slurry additive) HS-120 is as follows: by mass fraction, 10% polyacrylamide, 10% waterborne polyester, 1.35% fatty alcohol polyoxyethylene ether and 2.45% fatty alcohol polyoxyethylene ether.

[0039] Example 6 (HS-120 4 g / L)

[0040] Referring to Example 2, the difference is that the formulation of the additive (slurry additive) HS-120 is as follows: by mass fraction, 20% polyacrylamide, 5% waterborne polyester, 35% fatty alcohol polyoxyethylene ether 1 and 40% fatty alcohol polyoxyethylene ether 2.

[0041] Comparative Example 1

[0042] Referring to Example 2, the difference is that the formulation of additive HS-120 is 10% polyethylene glycol modified polyethylene terephthalate, 45% fatty alcohol polyoxyethylene ether 1, and 45% fatty alcohol polyoxyethylene ether 2.

[0043] Comparative Example 2

[0044] Referring to Example 2, the difference is that the formulation of the additive HS-120 is 10% polyacrylamide, 45% fatty alcohol polyoxyethylene ether 1, and 45% fatty alcohol polyoxyethylene ether 2.

[0045] Comparative Example 3

[0046] Referring to Example 2, the difference is that the formulation of additive HS-120 is 15% polyacrylamide, 5% waterborne polyester, and 280% fatty alcohol polyoxyethylene ether.

[0047] Comparative Example 4

[0048] Referring to Example 2, the difference is that the formulation of additive HS-120 is 15% polyacrylamide, 5% waterborne polyester, and 180% fatty alcohol polyoxyethylene ether.

[0049] Comparative Example 5

[0050] Referring to Example 2, the difference is that the additive added to the slurry is CJF-AA108 (Beijing Jingfang Washing Products Co., Ltd.), and the amount of additive added is 4 g / L.

[0051] Comparative Example 6

[0052] Referring to Example 2, the difference is that no additives are added to the slurry.

[0053] The yarns obtained in Examples 1-3 and Comparative Examples 1-6 were tested, and the results are as follows:

[0054] 1. Changes in yarn color after desizing, such as Figure 1-8 As shown in the figure, it is clear that compared with Comparative Example 6 without any additives, the addition of additive HS-120 significantly prevents the indigo dye in the sizing agent from staining the yarn. Furthermore, comparing the color of the yarn after desizing, it can be seen that the addition of additive HS-120 significantly reduces the influence of indigo in the sizing agent on the yarn's color. However, the addition of additive CJF-AA108 did not significantly prevent the indigo dye in the sizing agent from staining the yarn. Comparing Example 2 with Comparative Examples 2, 3, and 4, it can be seen that the anti-staining effect deteriorates to varying degrees. The absence of water-based polyester, fatty alcohol polyoxyethylene ether 2, and especially fatty alcohol polyoxyethylene ether 1, leads to a significant decrease in the additive's ability to prevent the indigo dye in the sizing agent from staining the yarn. This indicates that fatty alcohol polyoxyethylene ether 1, water-based polyester, and fatty alcohol polyoxyethylene ether 2 have a synergistic effect in the formulation, jointly preventing the indigo in the sizing agent from staining back onto the yarn and affecting the yarn's color.

[0055] 2. In Table 1, "L" represents the lightness or darkness of the fabric, with "+" indicating brightness and "-" indicating darkness; "a" indicates the degree of reddish or greenish tint of the fabric, with "+" indicating reddish tint and "-" indicating greenish tint; "b" indicates the degree of yellowish or bluish tint of the fabric, with "+" indicating yellowish tint and "-" indicating bluish tint. Since the selected denim fabric is blue denim, we mainly focus on the "L" and "b" values. Table 1 clearly shows that, compared to Comparative Example 6 without any additives, the addition of additive HS-120 significantly inhibits the indigo dye in the sizing agent from taking hold. Furthermore, comparing the yarn color after desizing also shows that adding additive HS-120 significantly reduces the influence of indigo dye in the sizing agent on the yarn color. However, adding additive CJF-AA108 did not significantly inhibit the indigo dye in the sizing agent from taking hold. Comparing Example 2 with Comparative Examples 2, 3, and 4, it can be seen that the anti-staining effect deteriorates to varying degrees. The absence of water-based polyester, fatty alcohol polyoxyethylene ether 2, and especially fatty alcohol polyoxyethylene ether 1, significantly reduces the ability of the additives to prevent indigo dye from staining the yarn. This indicates that fatty alcohol polyoxyethylene ether 1, water-based polyester, and fatty alcohol polyoxyethylene ether 2 have a synergistic effect, jointly preventing indigo from the sizing material from staining back onto the yarn and affecting its color.

[0056] Table 1. Yarn Color Changes

[0057]

[0058] 3. The changes in slurry adhesion are shown in Table 2 below. Comparing Examples 1, 2, and 3 with Comparative Example 6 without any additives, the addition of additive HS-120 has little effect on the adhesion of the slurry. The adhesion shows a downward trend, but it is not significant and can fully meet the production requirements. Comparing Example 2 with Comparative Examples 1 and 4, it is also obvious that without the addition of polyacrylamide, especially without the addition of fatty alcohol polyoxyethylene ether 2, the adhesion of the slurry is significantly reduced, which will affect the subsequent sizing effect. This indicates that the polyacrylamide in the formula, especially fatty alcohol polyoxyethylene ether 2 and fatty alcohol polyoxyethylene ether 1, has a synergistic effect and maintains the stability of the slurry adhesion. Comparing Example 2 with Comparative Example 5, the addition of additive CJF-AA108 significantly reduces the adhesion and will seriously affect the sizing effect, indicating that ordinary anti-staining additives have a significant impact on the adhesion of the slurry.

[0059] Table 2. Variation of Slurry Adhesion Strength

[0060]

[0061] 4. The yarn sizing rate is shown in Table 3.

[0062] Table 3. Yarn Sizing Rate

[0063]

[0064] Table 3 clearly shows that, compared with Comparative Example 6 without any additives, the addition of additive HS-120 has little effect on the sizing rate of the yarn, and is basically the same as the sizing rate without additives, which can fully meet the production requirements. Comparing Example 2 with Comparative Example 4, it is also clear that the absence of fatty alcohol polyoxyethylene ether 2 has a significant impact on the sizing rate of the yarn, which will affect the subsequent sizing effect. This indicates that fatty alcohol polyoxyethylene ether 2 and fatty alcohol polyoxyethylene ether 1 in the formula have a synergistic effect, maintaining the stability of the sizing agent and ensuring the stability of the yarn sizing rate. Compared with Comparative Example 5, the addition of additive CJF-AA108 significantly reduces the sizing rate, indicating that ordinary anti-staining additives have a significant impact on the sizing agent and will affect the sizing effect of the yarn.

[0065] 5. The results of the yarn strength test are shown in Table 4.

[0066] Table 4. Yarn Strength Variation Table

[0067]

[0068] Table 4 clearly shows that, comparing Examples 1, 2, and 3 with Comparative Example 6 without any additives, the addition of additive HS-120 has little effect on the sizing rate of the yarn. The addition of HS-120 also has little effect on the breaking strength and breaking elongation reduction of the sized yarn, similar to the effect without additives, ensuring that the subsequent weaving effect of the yarn is not affected. Comparing Example 2 with Comparative Examples 1 and 4, it is also clear that without polyacrylamide, especially without fatty alcohol polyoxyethylene ether 2, the breaking strength and breaking elongation reduction of the yarn are significantly worse. This indicates that the polyacrylamide, fatty alcohol polyoxyethylene ether 2, and fatty alcohol polyoxyethylene ether 1 in the formula work together, especially the synergistic effect of fatty alcohol polyoxyethylene ether 2 and fatty alcohol polyoxyethylene ether 1. This does not change the effect of sizing on the breaking strength and breaking elongation reduction of the yarn, and can fully guarantee the subsequent weaving efficiency. Comparing Example 2 with Comparative Example 5, the addition of additive CJF-AA108 affects the effect of sizing on the breaking strength and breaking elongation reduction of the yarn, thus affecting the subsequent weaving efficiency.

[0069] 6. The results of the yarn abrasion resistance test are shown in Table 5.

[0070] Table 5. Changes in Yarn Abrasion Resistance

[0071]

[0072] Table 5 clearly shows that, compared with Comparative Example 6 without any additives, the addition of additive HS-120 has little impact on the abrasion resistance of the sized yarn, and is basically the same as the sizing rate without additives, which can fully meet the production requirements. Comparing Example 2 with Comparative Examples 1 and 4, it is also clear that without the addition of polyacrylamide, especially without the addition of fatty alcohol polyoxyethylene ether 2, the abrasion resistance of the yarn will be significantly worse. This indicates that the polyacrylamide, fatty alcohol polyoxyethylene ether 2 and fatty alcohol polyoxyethylene ether 1 in the formula work together, especially the fatty alcohol polyoxyethylene ether 2 and fatty alcohol polyoxyethylene ether 1 have a synergistic effect, without changing the enhancement of yarn abrasion resistance by sizing, which can fully guarantee the subsequent weaving efficiency. Compared with Comparative Example 5, the addition of additive CJF-AA108 in Example 2 will affect the enhancement of yarn abrasion resistance by sizing, and will affect the subsequent weaving efficiency.

[0073] 7. The test results of slurry viscosity and solid content are shown in Table 6.

[0074] Table 6. Changes in Slurry Viscosity and Solid Content

[0075]

[0076] Table 6 shows the data on the viscosity and solids content of the sizing agent in real-time control during production practice in Example 4 of the reaction. As can be seen from Table 6, even with the addition of HS-120 in production practice, the viscosity and solids content of the sizing agent still fluctuate within the normal range, further demonstrating that HS-120 has little impact on the stability of the sizing agent and can be well applied in denim sizing production.

[0077] The above description of the embodiments is only for the purpose of helping to understand the technical solution and core idea of ​​the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A sizing additive to prevent dye absorption in denim yarn, characterized in that, By mass fraction, it comprises the following components: 10%–20% polyacrylamide, 5%–10% waterborne polyester, 35%–45% fatty alcohol polyoxyethylene ether 1, and 35%–45% fatty alcohol polyoxyethylene ether 2; wherein the fatty alcohol polyoxyethylene ether 1 is cetearyl alcohol polyether, and its molecular formula is C 12 H 25 O(CH2CH2O)3H; the molecular formula of the fatty alcohol polyoxyethylene ether 2 is RO(CH2CH2O). 30 H, R=C 12 H 25 ~ C 18 H 37 The waterborne polyester is polyethylene terephthalate modified with polyethylene glycol PEG6000, wherein polyethylene glycol PEG6000 accounts for 88% and polyethylene terephthalate PET accounts for 12%.

2. The slurry additive according to claim 1, characterized in that, By mass fraction, it comprises the following components: 15% polyacrylamide, 5% waterborne polyester, 40% fatty alcohol polyoxyethylene ether 1 and 40% fatty alcohol polyoxyethylene ether 2.

3. The method for preparing the slurry additive according to claim 1 or 2, characterized in that, The process includes the following steps: mixing polyacrylamide, waterborne polyester, fatty alcohol polyoxyethylene ether 1, and fatty alcohol polyoxyethylene ether 2 in sequence until homogeneous to obtain the slurry additive.

4. The application of the sizing additive as described in claim 1 or 2 in the denim yarn sizing process.

5. A sizing agent for denim yarn, characterized in that, Includes the slurry additive as described in claim 1 or 2.

6. The denim yarn sizing agent according to claim 5, characterized in that, Based on the volume of the slurry, the amount of the slurry additive added is 2~10 g / L.

7. The denim yarn sizing agent according to claim 6, characterized in that, Based on the volume of the slurry, the amount of the slurry additive added is 2~6 g / L.

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