Low-viscosity mixed slurry preparation process and room-temperature warp sizing method

Abstract

The invention relates to a low-viscosity mixed slurry preparation process and a room-temperature warp sizing method, through a simple, feasible and low-cost slurry modification method, the viscosity of the prepared mixed slurry is reduced, and the prepared mixed slurry has good viscosity stability and fluidity, and does not gel or crust. The apparent viscosity of the modified slurry at 30 DEG C is close to that of the unmodified slurry at 95 DEG C, and the modified slurry has better viscosity stability which can reach 96%. The sizing rate of yarns sized with the mixed size modified by potassium persulfate with the weight being 2% of the weight of the acetate starch is 12.36%, the tensile breaking strength and the wear-resistant times of sized yarns are remarkably improved, and the strength enhancement rate and the wear-resistant enhancement rate are 19.09% and 63.29% respectively. The harmful hairiness is greatly reduced, and the reduction rate of the harmful hairiness is 39.91%. The room-temperature warp sizing is adopted, energy can be saved, consumption can be reduced, yarn damage is reduced, the production efficiency is improved, and the working environment is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of sizing, and in particular relates to a low-viscosity mixed sizing process and a room-temperature warp sizing method. Background Art

[0002] Room-temperature warp sizing technology, an innovative process in the textile industry, aims to improve weaving efficiency and fabric quality. Traditionally, warp sizing is performed at relatively high temperatures (85°C–95°C) to ensure that the sizing agent evenly coats the yarn surface and forms an effective protective layer, thereby increasing yarn strength and abrasion resistance and facilitating subsequent weaving processes. However, this high-temperature sizing method is not only energy-intensive, costly, and cumbersome, but also places high demands on environmental conditions and equipment performance. Furthermore, the sizing agent is prone to crusting, and high evaporation of the sizing agent causes unstable sizing viscosity, thus affecting the sizing effect.

[0003] Room-temperature warp sizing technology is an innovative solution designed to address the challenges of traditional high-temperature sizing. By optimizing the pulping and sizing processes, this technology enables effective yarn sizing at room temperature. Its advantages include: The sizing process requires no heating, significantly reducing energy consumption and production costs while also aligning with environmentally friendly production practices; room-temperature operation simplifies and expedits the production process, effectively shortening the production cycle and improving overall production line efficiency; It also avoids the safety hazards associated with high-temperature operations, providing a more comfortable and safe working environment for workers; and sizing is more stable at room temperature, mitigating the adverse effects of uneven sizing. Despite its numerous advantages, room-temperature warp sizing technology requires continuous improvement in key processes such as sizing material selection, pulping, and low-temperature sizing to ensure the quality and performance of the final product meet requirements. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a low-viscosity mixed slurry preparation process to solve the technical problem that conventional sizing can only be performed on yarn at a relatively high temperature, resulting in high sizing cost and high energy consumption.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a low-viscosity mixed slurry preparation process, comprising the following steps: (1) A certain amount of starch acetate and polyvinyl alcohol (PVA) 088-05 were added to hot water at 60°C to 80°C in a mass ratio of 6:4, and stirred at 800-900 r / min for 10 min to 30 min to obtain a pre-mixed slurry. (2) The mixed slurry obtained in step (1) is evenly divided into multiple portions, different amounts of potassium persulfate are added to each mixed slurry and stirred evenly, and then each mixed slurry is heated to 95°C and gelatinized at this temperature; each mixed slurry is then cooled to 25°C~35°C to obtain a viscosity-reduced mixed slurry, and each mixed slurry is tested for apparent viscosity and viscosity stability. According to the apparent viscosity and viscosity stability test results, a potassium persulfate ratio of the mixed slurry is selected whose apparent viscosity is closest to that of the unreduced viscosity slurry and whose viscosity stability is not lower than that of the unreduced viscosity slurry; (3) First, the mixed slurry is prepared again according to step (1), and then potassium persulfate is added according to the ratio of potassium persulfate to the mixed slurry selected in step (2), and then the slurry is stirred in a slurry mixing barrel and heated to 95°C, and gelatinized at this temperature for 2-3 hours; finally, the slurry mixing barrel is cooled to 25°C~35°C to obtain a finished low-viscosity mixed slurry.

[0006] As a preferred embodiment, the solid content of the mixed slurry in step (1) is 10%.

[0007] As a preferred embodiment, the mass of potassium persulfate added to each mixed slurry in step (2) is 1-3% of the mass of starch acetate in each mixed slurry.

[0008] As a preferred embodiment, the gelatinization time in step (3) is 2 hours.

[0009] As a preferred embodiment, in step (2) and step (3), the mixed slurry is gelatinized and then cooled to 30°C.

[0010] The present invention further aims to solve the technical problem of providing a room temperature warp yarn sizing method to solve the technical problems of high sizing cost and high energy consumption in the traditional high temperature sizing process.

[0011] In order to solve the above technical problems, the technical solution adopted by the present invention is: a room temperature warp sizing method, first transferring the low-viscosity mixed slurry to the sizing tank; then setting the sizing parameters of the sizing machine: the pre-pressing roller pressure is 0.75~6 kN, the main pressing roller pressure is 7kN, the sizing speed is 10 m / min, the pre-drying temperature is 75~95 ℃, the combined drying temperature is 70~90 ℃, and the sizing tank temperature is 30~35 ℃. The low-viscosity mixed slurry is the low-viscosity mixed slurry prepared by the above-mentioned low-viscosity mixed slurry preparation process.

[0012] As a preferred solution, an XSY617-700 sizing machine is used for sizing.

[0013] As a preferred solution, 14.8 tex compactly spun pure cotton yarn is sized; the warp yarn cover factor is 25.6%.

[0014] The beneficial effects of the present invention are as follows: In the present invention, through a simple, easy, and low-cost slurry modification method, the viscosity of the prepared mixed slurry is reduced, and it has good viscosity stability and fluidity, and the slurry does not gel or form a skin. The apparent viscosity of the modified slurry at 30°C is similar to that of the unmodified slurry at 95°C, and it has better viscosity stability, reaching 96%. The sizing rate of the yarn sized by the mixed slurry modified with potassium persulfate containing 2% by weight of acetate starch is 12.36%, and the tensile breaking strength and abrasion resistance of the sized yarn are significantly improved, with the strength enhancement rate and abrasion resistance enhancement rate being 19.09% and 63.29%, respectively. Harmful hairiness is greatly reduced, with a harmful hairiness reduction rate of 39.91%.

[0015] The present invention adopts room temperature warp sizing, which has the main advantages of energy saving and consumption reduction, reduction of yarn damage, improvement of production efficiency and improvement of working environment. DETAILED DESCRIPTION

[0016] The specific embodiments of the present invention are described in detail below. Example 1

[0017] A process for preparing a low-viscosity mixed slurry comprises the following steps: (1) 60 g of starch acetate and 40 g of polyvinyl alcohol (PVA) 088-05 were added to 900 g of hot water at 60°C to 80°C in a mass ratio of 6:4. The mixture was stirred at 800-900 r / min for 10-30 min to obtain 1000 g of pre-mixed slurry with a solid content of 10%. (2) The mixed slurry obtained in step (1) was divided into 5 equal parts, and potassium persulfate at 1%, 1.5%, 2%, 2.5%, and 3% of the mass of starch acetate was added to each mixed slurry, respectively, and stirred evenly. Then, each mixed slurry was heated to 95°C and gelatinized at this temperature. Each mixed slurry was then cooled to 30°C to obtain a viscosity-reduced mixed slurry, and the apparent viscosity and viscosity stability of each mixed slurry were tested. According to the apparent viscosity and viscosity stability test results of the mixed slurries shown in Table 1, a potassium persulfate ratio of the mixed slurry was selected, which had an apparent viscosity closest to that of the unreduced viscosity slurry and a viscosity stability not lower than that of the unreduced viscosity slurry.

[0018] Table 1: Apparent viscosity and viscosity stability of mixed slurry

[0019] Table 1 shows the apparent viscosity and viscosity stability of the mixed slurry before and after viscosity reduction at 95°C and 30°C. In Table 1, 1% KPS means that the proportion of potassium persulfate is 1% of the mass of starch acetate in the mixed slurry.

[0020] As shown in Table 1, when the proportion of potassium persulfate is 2% by weight of the starch acetate in the mixed slurry, the apparent viscosity of the reduced viscosity slurry at 30°C is closest to that of the unreduced viscosity slurry at 95°C, and the viscosity stability is greater than that of the unreduced viscosity slurry at 95°C. Therefore, 2% by weight of the starch acetate was selected as the potassium persulfate addition ratio.

[0021] As shown in the table, the apparent viscosity of the slurry decreases with increasing potassium persulfate addition, indicating that potassium persulfate reduces intermolecular interactions and hydrogen bonding, disrupting the tightly coiled helical structure of starch molecules and thus reducing the apparent viscosity of the slurry. The apparent viscosity of the unreduced mixed slurry at 95°C was 15.65 mPa·s. After viscosity reduction with potassium persulfate at a concentration of 2% and 2.5% by weight of starch acetate, the apparent viscosities of the mixed slurries were 16.75 and 14.75 mPa·s, respectively. Minimizing the use of potassium persulfate minimizes the viscosity of the reduced mixed slurry at 30°C and the viscosity of the unreduced mixed slurry at 95°C. Therefore, a potassium persulfate dosage of 2% by weight of starch acetate is more suitable as a viscosity reducer. In addition, the viscosity stability of all the slurries after viscosity reduction at 30 ℃ was 92.97% greater than that of the mixed slurries without viscosity reduction at 95 ℃, which indicates that the gelatinization time of 2 h can allow the slurry to fully react with potassium persulfate. In the present invention, potassium persulfate (2% by weight of starch acetate) is added during the sizing process to reduce the viscosity of the mixed slurry at room temperature, thereby avoiding insufficient slurry fluidity due to excessively high viscosity, which affects the performance of the sized yarn at room temperature.

[0022] (3) First, the mixed slurry is prepared again according to the steps of step (1). This time, the weight of each component is increased in equal proportion to prepare 30 kg of mixed slurry. Then, potassium persulfate is added according to the ratio of potassium persulfate to the mass of starch acetate in the mixed slurry selected in step (2). Then, the mixed slurry is stirred in a slurry mixing tank and heated to 95 ° C. It is gelatinized at this temperature for 2 hours. Finally, the slurry mixing tank is cooled to 30 ° C to obtain a finished low-viscosity mixed slurry.

[0023] The cooling temperature in this embodiment can be adjusted appropriately according to the ambient temperature, ranging from 25° C. to 35° C. The gelatinization time can be 2 to 3 hours. Example 2

[0024] The room temperature warp sizing method is as follows: first, the low-viscosity mixed size is transferred to the size tank; then the sizing parameters of the sizing machine are set: the pre-pressing roller pressure is 0.75~6 kN, the main pressing roller pressure is 7 kN, the sizing speed is 10 m / min, the pre-drying temperature is 75~95 ℃, the combined drying temperature is 70~90 ℃, and the size tank temperature is 30~35 ℃. The low-viscosity mixed size is the low-viscosity mixed size prepared by the low-viscosity mixed size preparation process described in Example 1.

[0025] In this embodiment, an XSY617-700 sizing machine is preferably used to size 14.8 tex compactly spun pure cotton yarn, and the warp cover factor is 25.6%.

[0026] Table 2 is the performance comparison results of warp yarn sized with 2% KPS viscosity reducing sizing solution and warp yarn sized with no viscosity reducing sizing solution.

[0027] Table 2: Properties of Warp Yarn Sized with 2% KPS Viscosity Reducing Sizing Solution

[0028] As shown in Table 2, the tensile breaking strength and abrasion resistance of the warp yarns sized with 2% KPS viscosity-reducing sizing solution were significantly increased, while harmful hairiness was greatly reduced. The sizing rate of the warp yarns sized with 2% KPS viscosity-reducing sizing solution at 30°C was around 12%, indicating that the viscosity-reduced sizing solution had good stability. Under these sizing conditions, the tensile breaking strength of the warp yarns was significantly enhanced, with the strength enhancement rate exceeding 18%. The enhancement in abrasion resistance was particularly significant, with all sized warp yarns having an abrasion resistance enhancement rate exceeding 48%. In addition, harmful hairiness was also significantly reduced. Therefore, the room temperature sizing method proposed in the present invention can significantly improve the mechanical properties of the warp yarns and reduce harmful hairiness that is detrimental to subsequent weaving. In industrial production, this sizing method has significant practical benefits and considerable practical value.

[0029] The above embodiments are merely illustrative of the principles and effects of the present invention, as well as some embodiments of its application, and are not intended to limit the present invention. It should be noted that a person skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A process for preparing a low-viscosity mixed slurry, characterized in that: The steps include: (1) A certain amount of starch acetate and polyvinyl alcohol (PVA) 088-05 were added to hot water at 60°C to 80°C in a mass ratio of 6:4, and stirred at 800-900 r / min for 10-30 min to obtain a pre-mixed slurry. (2) The mixed slurry obtained in step (1) is evenly divided into multiple portions, different amounts of potassium persulfate are added to each mixed slurry and stirred evenly, and then each mixed slurry is heated to 95°C and gelatinized at this temperature; each mixed slurry is then cooled to 25°C~35°C to obtain a viscosity-reduced mixed slurry, and each mixed slurry is tested for apparent viscosity and viscosity stability. According to the apparent viscosity and viscosity stability test results, a potassium persulfate ratio of the mixed slurry is selected whose apparent viscosity is closest to that of the unreduced viscosity slurry and whose viscosity stability is not lower than that of the unreduced viscosity slurry; (3) First, the mixed slurry is prepared again according to step (1), and then potassium persulfate is added according to the ratio of potassium persulfate to the mixed slurry selected in step (2), and then the slurry is stirred in a slurry mixing barrel and heated to 95°C, and gelatinized at this temperature for 2-3 hours; finally, the slurry mixing barrel is cooled to 25°C~35°C to obtain a finished low-viscosity mixed slurry.

2. The process for preparing a low-viscosity mixed slurry according to claim 1, characterized in that: The solid content of the mixed slurry in step (1) is 10%.

3. The process for preparing a low-viscosity mixed slurry according to claim 1, characterized in that: The mass of potassium persulfate added to each mixed slurry in step (2) is 1-3% of the mass of starch acetate in each mixed slurry.

4. The process for preparing a low-viscosity mixed slurry according to claim 1, wherein: The gelatinization time in step (3) is 2 h.

5. The process for preparing a low-viscosity mixed slurry according to claim 1, wherein: In step (2) and step (3), the mixed slurry is gelatinized and then cooled to 30°C.

6. A room temperature warp sizing method, characterized in that: First, the low-viscosity mixed slurry is transferred to the sizing tank; then the sizing parameters of the sizing machine are set: the pre-pressing roller pressure is 0.75~6 kN, the main pressing roller pressure is 7 kN, the sizing speed is 10 m / min, the pre-drying temperature is 75~95°C, the combined drying temperature is 70~90°C, and the sizing tank temperature is 30~35°C. The low-viscosity mixed slurry is a low-viscosity mixed slurry prepared by the low-viscosity mixed slurry preparation process according to any one of claims 1 to 5.

7. The room temperature warp yarn sizing method according to claim 6, characterized in that: XSY617-700 sizing machine is used for sizing.

8. The room temperature warp yarn sizing method according to claim 7, characterized in that: 14.8 tex compact-spun pure cotton yarn was sized; the warp cover factor was 25.6%.

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