Deerskin-imitated velvet socks and preparation method thereof

Abstract

The invention relates to the technical field of textile, and discloses a deerskin-imitated velvet sock and a preparation method thereof, and the method comprises the steps of sock blank weaving, dyeing treatment, preparation of temperature self-adaptive multi-element synergistic post-treatment liquid, padding treatment, drying and shaping, after-treatment and the like. Wherein the post-treatment liquid is composed of seven components including a phospholipid compound, sodium alginate, xanthan gum, fatty alcohol-polyoxyethylene ether, a lanolin derivative, medium-chain triglyceride and phytosterol ester in a synergistic manner, and a double-layer structure including an elastic bottom layer and a soft surface layer is formed on the surface of the fiber; the medium-chain triglyceride and the phytosterol ester respectively provide low-temperature anti-freezing performance and high-temperature stability performance, so that temperature self-adaptive regulation and control are realized. The method solves the technical problems of insufficient suede fullness, easy flock lodging, non-uniform treatment and poor temperature adaptability of the existing imitation deerskin velvet socks, and enables the socks to keep stable suede effect and soft hand feeling in a wide temperature range of-5 DEG C to 45 DEG C.

Description

Technical Field

[0001] This invention relates to the field of textile technology, and more specifically, to a suede-like sock and its preparation method. Background Technology

[0002] Imitation suede socks are a high-value-added product in the hosiery market. They are characterized by a full, delicate nap and a soft, comfortable feel, similar to the texture of natural deerskin. The production of these products typically involves weaving first, followed by dyeing and finishing. The finishing process plays a decisive role in the final nap effect and feel of the product.

[0003] Existing technologies for manufacturing imitation suede socks mainly employ single or a few chemical softeners for post-treatment of the sock blank, but these technologies suffer from the following technical problems: First, the nap is not full enough. Traditional processing methods make it difficult to make the micro-hairs on the fiber surface fluffy and oriented. The processed socks have insufficient flatness and poor three-dimensionality. The nap fluffiness is only 40-60% of that of natural deerskin, and it cannot present the full nap effect of natural deerskin.

[0004] Secondly, the fleece is prone to flattening and uneven treatment. Fleece treated with a single additive lacks an effective support structure, making it easy to flatten during wear and washing. After 10 washes, the fleece effect diminishes by more than 50%. Simultaneously, the poor dispersibility between hydrophobic components (such as lipid softeners) and hydrophilic components in the treatment solution leads to uneven surface treatment of the socks, resulting in differences in color and feel, affecting product quality consistency.

[0005] Most critically, the temperature adaptability is poor. In existing processing systems, lipid components solidify and harden at low temperatures (0-10℃), causing the suede to lose its softness and resilience. At high temperatures (30-40℃), the lipid components are too fluid and may migrate, leading to uneven suede processing. In environments with large diurnal temperature variations, the lipid layer repeatedly undergoes solid-liquid phase transitions, resulting in fatigue cracks and a decrease in the suede modification effect. This makes it difficult for existing products to maintain a stable suede effect and soft feel in different seasons and regions. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides a faux suede sock and its preparation method.

[0007] A method for preparing imitation suede socks includes sock blank weaving, dyeing, post-treatment, drying and setting, and finishing steps. The post-treatment step uses a temperature-adaptive post-treatment solution to treat the dyed sock blank. The post-treatment solution is prepared from the following components in parts by weight: 10-30 parts sodium alginate, 2-8 parts xanthan gum, 15-40 parts phospholipid compounds, 10-35 parts lanolin derivatives, 5-15 parts fatty alcohol polyoxyethylene ether, 5-20 parts medium-chain triglycerides, and 3-15 parts phytosterol esters. The phospholipid compound is selected from one or more of lecithin, soybean lecithin, or hydrogenated lecithin; the lanolin derivative is selected from one or more of lanolin alcohol, lanolin fatty acid, or polyoxyethylene lanolin; the medium-chain triglyceride is selected from one or more of caprylic triglyceride, capric triglyceride, or caprylic-capric triglyceride; and the phytosterol ester is selected from one or more of β-sitosterol fatty acid ester, stigmasterol fatty acid ester, or rapeseed sterol fatty acid ester.

[0008] Preferably, the preferred proportions of the components in the post-treatment solution are: 15-25 parts sodium alginate, 3-6 parts xanthan gum, 20-35 parts phospholipids, 15-30 parts lanolin derivatives, 8-12 parts fatty alcohol polyoxyethylene ethers, 8-15 parts medium-chain triglycerides, and 5-12 parts phytosterol esters.

[0009] Preferably, the preparation method of the post-treatment solution includes the following steps: Sodium alginate and xanthan gum are stirred in a water bath at 20-40℃ for 30-90 minutes until completely dissolved to form a hydrophilic phase. Phospholipids, lanolin derivatives, medium-chain triglycerides, and phytosterol esters are stirred at 50-70℃ for 20-60 min to form a hydrophobic phase. Add fatty alcohol polyoxyethylene ether to the hydrophobic phase and stir at high speed at 50-70℃ for 15-45 min; The hydrophobic phase was added to the hydrophilic phase at a rate of 50-200 mL / min, and the mixture was stirred at 40-60℃ for 30-90 min to obtain the post-treatment solution.

[0010] Preferably, the total solids content of the post-treatment solution is 5-20%, and the pH value is 6.0-8.0.

[0011] Preferably, the phospholipid compound has a phospholipid content of 60-98%, an HLB value of 8-12, and an iodine value of 60-100 gI2 / 100g.

[0012] Preferably, the sodium alginate has a molecular weight of 100,000-500,000 Da, a viscosity of 200-800 mPa·s at 25°C for a 1% aqueous solution, and an M / G ratio of 0.5-2.0; the xanthan gum has a molecular weight of 2,000,000-20,000,000 Da, a viscosity of 1200-1600 mPa·s at 25°C for a 1% aqueous solution, and an ash content of 10-15%.

[0013] Preferably, the fatty alcohol polyoxyethylene ether has an HLB value of 12-16, a fatty alcohol carbon chain length of C12-C18, and a polyoxyethylene segment molar number of 7-15.

[0014] Preferably, the lanolin derivative has a saponification value of 90-140 mg KOH / g, an acid value of 3-20 mg KOH / g or a hydroxyl value of 20-60 mg KOH / g, and a softening point of 36-48℃.

[0015] Preferably, the medium-chain triglyceride has a C8 / C10 ratio of 50:50 to 80:20, a saponification value of 320-360 mgKOH / g, and a freezing point below -10℃; the phytosterol ester has a sterol content of 30-50%, a degree of esterification of 85-98%, and a melting point of 100-150℃.

[0016] Preferably, in the post-processing step, the dyed sock blank is immersed in a post-processing solution at 30-50℃ for 5-20 min, and then rolled by rollers at a rolling pressure of 0.1-0.5 MPa, with the roll residue controlled at 60-90%; in the drying and shaping step, the blank is dried at 60-100℃ for 15-40 min, or air-dried at room temperature of 15-30℃ for 8-24 h.

[0017] A type of imitation suede sock prepared according to the above-described preparation method.

[0018] The beneficial effects of this invention are as follows: (1) The fullness and three-dimensionality of the plush surface are significantly improved. The mixed lipid film formed by phospholipid compounds and lanolin derivatives reduces the coefficient of friction on the fiber surface and regulates surface tension, promoting the fullness and directional alignment of the microfibers on the fiber surface, resulting in a full and delicate nap effect on the socks. The elastic gel layer formed by sodium alginate and xanthan gum provides independent three-dimensional support for each fiber, preventing it from flattening and maintaining the three-dimensionality and fullness of the nap. The nap of the faux suede socks prepared in this embodiment can reach 85-95% of that of natural deerskin, significantly better than traditional treatment methods (only 40-60% nap), and its visual appearance and feel are close to those of natural deerskin.

[0019] (2) Excellent lodging resistance and durability of the down The elastic gel layer formed by the sodium alginate-xanthan gum compound is firmly bonded to the fiber surface through hydrogen bonds, providing durable three-dimensional support for the pile. Even after repeated wear and washing, the elastic layer retains its supporting function, allowing the pile to quickly rebound after compression. Simultaneously, the phospholipid-lanolin mixed lipid membrane exhibits excellent flexibility and compression resistance; the synergistic effect of the bilayer structure ensures a long-lasting and stable pile modification effect. The faux suede socks prepared in this embodiment retain more than 80% of their initial pile effect after 30 standard washes, while traditional treatment methods result in a pile effect reduction of more than 50% after only 10 washes.

[0020] (3) Good processing uniformity and product quality consistency Fatty alcohol polyoxyethylene ether emulsifies and disperses hydrophobic components such as phospholipids, lanolin, MCT, and phytosterol esters into microparticles with a particle size of 50-500 nanometers, ensuring that each component maintains a stable and uniform dispersion in the treatment solution. During padding and drying, these nanoparticles can be uniformly adsorbed onto each nap of the sock surface, avoiding problems such as mottled nap and uneven feel caused by poor dispersion of hydrophobic and hydrophilic components in traditional methods. The imitation suede socks prepared in this embodiment have a uniform surface treatment, good consistency in nap effect and feel in different areas, and stable product quality.

[0021] (4) It has strong temperature adaptability and can be used in all seasons and regions. The short-chain structure of medium-chain triglycerides lowers the freezing point of the lipid membrane, allowing the lipid layer to maintain a liquid or semi-solid flexible state at low temperatures (-5°C), ensuring the socks retain a soft, suede-like feel in winter or cold regions. The rigid structure of phytosterol esters enhances the cohesion of the lipid layer at high temperatures (45°C), preventing excessive flow or migration of lipid components. The temperature stability of xanthan gum ensures consistent performance of the elastic underlayer over a wide temperature range. The synergistic effect of these three factors allows the faux suede socks prepared in this embodiment to maintain a stable suede effect and soft feel over a wide temperature range from -5°C to 45°C, with performance fluctuations controlled within 15%. This temperature-adaptive performance makes the product suitable for different seasons and regions, meeting consumers' year-round wearing needs.

[0022] (5) It is environmentally friendly and conforms to the development trend of green textiles. The sodium alginate, xanthan gum, lanolin derivatives, and phytosterol esters used in this embodiment are all of natural origin or bio-based materials. Phospholipids and medium-chain triglycerides also have good biocompatibility and biodegradability. The overall treatment system is free of heavy metals and harmful substances, is environmentally friendly, non-irritating to the human body, and conforms to the development trend of green textiles and environmental protection regulations. Attached Figure Description

[0023] Figure 1This is a bar chart comparing the pile loft index of different samples of the present invention; Figure 2 This is the curve showing the change in the thickness of the fleece surface at different temperatures according to the present invention; Figure 3 These are the fluffiness and washability curves of different samples of the present invention; Figure 4 These are the lodging resistance curves of the fibers of different samples of this invention; Figure 5 This is a bar chart comparing the performance retention rates of different samples after washing according to the present invention. Detailed Implementation

[0024] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, some features described in the examples may be combined in other examples.

[0025] Example 1 This embodiment proposes a method for preparing imitation suede socks, including sock blank weaving, dyeing, post-treatment, drying and setting, and finishing steps. The post-treatment step uses a temperature-adaptive post-treatment solution to treat the dyed sock blank. The post-treatment solution is prepared from the following components in parts by weight: 20 parts sodium alginate, 5 parts xanthan gum, 30 parts phospholipid compounds, 20 parts lanolin derivatives, 10 parts fatty alcohol polyoxyethylene ether, 12 parts medium-chain triglycerides, and 10 parts phytosterol esters. The phospholipid compound is selected from lecithin, the lanolin derivative is selected from lanolin alcohol, the medium-chain triglyceride is selected from caprylic triglyceride, and the phytosterol ester is selected from β-sitosterol fatty acid ester.

[0026] The preparation method of the post-treatment solution includes the following steps: Sodium alginate and xanthan gum were stirred in a 30°C water bath for 60 min until completely dissolved to form a hydrophilic phase. Phospholipids, lanolin derivatives, medium-chain triglycerides, and phytosterol esters were stirred at 60°C for 40 min to form a hydrophobic phase. Fatty alcohol polyoxyethylene ether was added to the hydrophobic phase and stirred at high speed at 60°C for 30 min. The hydrophobic phase was added to the hydrophilic phase at a rate of 125 mL / min, and the mixture was stirred at 50 °C for 60 min to obtain the post-treatment solution.

[0027] The total solids content of the post-treatment solution was 12%, and the pH value was 7.0.

[0028] The phospholipid content of the compound is 78%, the HLB value is 10, and the iodine value is 80 g I2 / 100g.

[0029] The sodium alginate has a molecular weight of 300,000 Da, a viscosity of 500 mPa·s in a 1% aqueous solution at 25°C, and an M / G ratio of 1; the xanthan gum has a molecular weight of 11,000,000 Da, a viscosity of 1400 mPa·s in a 1% aqueous solution at 25°C, and an ash content of 12%.

[0030] The fatty alcohol polyoxyethylene ether has an HLB value of 14, a fatty alcohol carbon chain length of C15, and a polyoxyethylene segment molar number of 11.

[0031] The saponification value of the lanolin derivative is 115 mg KOH / g, the acid value is 11 mg KOH / g or the hydroxyl value is 40 mg KOH / g, and the softening point is 42℃.

[0032] The medium-chain triglyceride has a C8 / C10 ratio of 65:35, a saponification value of 340 mg KOH / g, and a freezing point below -10℃; the phytosterol ester has a sterol content of 40%, a degree of esterification of 92%, and a melting point of 125℃.

[0033] In the post-processing step, the dyed sock blank is immersed in a post-processing solution at 40°C for 12 min, and then rolled by rollers at a rolling pressure of 0.3 MPa, with the roll residue controlled at 75%; the drying and shaping step is dried at 80°C for 30 min.

[0034] Example 2 The difference between this embodiment and Embodiment 1 is that: The post-treatment solution is prepared from the following components in parts by weight: 10 parts sodium alginate, 2 parts xanthan gum, 15 parts phospholipids, 10 parts lanolin derivatives, 55 parts fatty alcohol polyoxyethylene ether, 5-20 parts medium-chain triglycerides and 3 parts phytosterol esters. Phospholipid compounds are selected from soybean phospholipids; Lanolin derivatives are selected from lanolin fatty acids; Medium-chain triglycerides are selected from decanoic acid triglycerides; Plant sterol esters are selected from soybean sterol fatty acid esters.

[0035] Sodium alginate and xanthan gum were stirred in a 20°C water bath for 30 minutes until completely dissolved to form a hydrophilic phase. Phospholipids, lanolin derivatives, medium-chain triglycerides, and phytosterol esters were stirred at 50°C for 20 min to form a hydrophobic phase. Fatty alcohol polyoxyethylene ether was added to the hydrophobic phase and stirred at high speed at 50°C for 15 min. The hydrophobic phase was added to the hydrophilic phase at a rate of 50 mL / min, and the mixture was stirred at 40 °C for 30 min to obtain the post-treatment solution.

[0036] The total solids content of the post-treatment solution is 5%, and the pH value is 6.0.

[0037] The phospholipid content of the compound is 60%, the HLB value is 8, and the iodine value is 60 g I2 / 100g.

[0038] The sodium alginate has a molecular weight of 100,000 Da, a viscosity of 200 mPa·s at 25°C for a 1% aqueous solution, and an M / G ratio of 0.5; the xanthan gum has a molecular weight of 2,000,000 Da, a viscosity of 1200 mPa·s at 25°C for a 1% aqueous solution, and an ash content of 10%.

[0039] The fatty alcohol polyoxyethylene ether has an HLB value of 12, a fatty alcohol carbon chain length of C12, and a polyoxyethylene segment molar number of 7.

[0040] The saponification value of the lanolin derivative is 90 mg KOH / g, the acid value is 3 mg KOH / g or the hydroxyl value is 20 mg KOH / g, and the softening point is 36℃.

[0041] The medium-chain triglyceride has a C8 / C10 ratio of 50:50, a saponification value of 320 mg KOH / g, and a freezing point below -10℃; the phytosterol ester has a sterol content of 30%, a degree of esterification of 85%, and a melting point of 100℃.

[0042] In the post-processing step, the dyed sock blank is immersed in a post-processing solution at 30°C for 5 minutes, and then rolled by rollers at a rolling pressure of 0.1 MPa, with the roll residue controlled at 60%; the drying and shaping step is to dry at 60°C for 15 minutes.

[0043] Example 3 The difference between this embodiment and Embodiment 1 is that: The post-treatment solution is prepared from the following components in parts by weight: 30 parts sodium alginate, 8 parts xanthan gum, 40 parts phospholipids, 35 parts lanolin derivatives, 15 parts fatty alcohol polyoxyethylene ether, 20 parts medium-chain triglycerides and 15 parts phytosterol esters. Phospholipid compounds are selected from lecithin, soybean lecithin, and hydrogenated lecithin; Lanolin derivatives are selected from lanolin alcohol, lanolin fatty acids, and polyoxyethylene lanolin; Medium-chain triglycerides are selected from caprylic triglyceride, capric triglyceride, and caprylic / capric triglyceride. Plant sterol esters are selected from β-sitosterol fatty acid esters, soybean sterol fatty acid esters, and rapeseed sterol fatty acid esters.

[0044] Sodium alginate and xanthan gum were stirred in a 40℃ water bath for 90 min until completely dissolved to form a hydrophilic phase. Phospholipids, lanolin derivatives, medium-chain triglycerides, and phytosterol esters were stirred at 70°C for 60 min to form a hydrophobic phase. Fatty alcohol polyoxyethylene ether was added to the hydrophobic phase and stirred at high speed at 70°C for 45 min. The hydrophobic phase was added to the hydrophilic phase at a rate of 200 mL / min, and the mixture was stirred at 60 °C for 90 min to obtain the post-treatment solution.

[0045] The total solids content of the post-treatment solution was 20%, and the pH value was 8.0.

[0046] The phospholipid content of the phospholipid compound is 98%, the HLB value is 12, and the iodine value is 100 g I2 / 100g.

[0047] The sodium alginate has a molecular weight of 500,000 Da, a viscosity of 800 mPa·s in a 1% aqueous solution at 25°C, and an M / G ratio of 2.0; the xanthan gum has a molecular weight of 20,000,000 Da, a viscosity of 600 mPa·s in a 1% aqueous solution at 25°C, and an ash content of 15%.

[0048] The fatty alcohol polyoxyethylene ether has an HLB value of 16, a fatty alcohol carbon chain length of C18, and a polyoxyethylene segment molar number of 15.

[0049] The saponification value of the lanolin derivative is 140 mg KOH / g, the acid value is 20 mg KOH / g or the hydroxyl value is 60 mg KOH / g, and the softening point is 48℃.

[0050] The medium-chain triglyceride has a C8 / C10 ratio of 80:20, a saponification value of 360 mg KOH / g, and a freezing point below -10℃; the phytosterol ester has a sterol content of 50%, a degree of esterification of 98%, and a melting point of 150℃.

[0051] In the post-processing step, the dyed sock blank is immersed in a post-processing solution at 50°C for 20 min, and then rolled by rollers at a rolling pressure of 0.5 MPa, with the roll residue controlled at 90%; the drying and shaping step is dried at 100°C for 40 min, or air-dried at room temperature of 15-30°C for 8-24 h.

[0052] Example 4 This embodiment presents a faux suede sock, prepared by the following method, which includes the following steps: Step 1: Sock blank weaving Using conventional sock machines and weaving processes in the art, yarns containing synthetic fibers (such as nylon, polyester, spandex, etc.) or natural fibers (such as cotton, wool, etc.) are woven into a sock blank with the shape and structure of a sock. This step is a well-known conventional technique in the art, and those skilled in the art can select appropriate fiber materials and weaving processes to achieve it according to the required specifications and performance requirements of the socks.

[0053] Step 2: Staining treatment The sock blanks obtained in step 1 are then dyed. Suitable dyes are selected based on the fiber type, such as disperse dyes for synthetic fibers, reactive dyes for cellulose fibers, and acid dyes for protein fibers. The dyeing temperature is 60-130℃, and the dyeing time is 30-90 minutes, to achieve the desired color in the sock blanks. After dyeing, the sock blanks undergo routine washing (2-4 washes) and dehydration (to a dehydration rate of 50-70%) to remove excess dye and residual dye, yielding the dyed sock blanks. This step is a well-known and standard dyeing technique in the field.

[0054] Step 3: Preparation of temperature-adaptive multi-component synergistic post-treatment solution This step is the core step of this embodiment, and its key point is to construct a seven-component synergistic temperature-adaptive treatment system. This system can form a double-layer structure with elastic support and soft coating on the fiber surface, and achieve stable performance over a wide temperature range by introducing temperature-regulating components.

[0055] The difference from existing technologies: Existing technologies typically use a single lipid softener or a simple compound of a few auxiliaries for post-treatment. These treatment systems have the following drawbacks: First, they lack an effective support structure for the fibers, making them prone to collapsing; second, hydrophobic and hydrophilic components are difficult to disperse stably, resulting in poor processing uniformity; and third, lipid components solidify at low temperatures and flow at high temperatures, exhibiting poor temperature adaptability. This embodiment introduces sodium alginate and xanthan gum to construct an elastic support layer, introduces medium-chain triglycerides and phytosterol esters to achieve temperature adaptive regulation, and uses fatty alcohol polyoxyethylene ethers to achieve stable emulsification and dispersion of hydrophobic and hydrophilic components. This forms a bilayer modified structure with three-dimensional synergistic functions on the fiber surface, fundamentally solving the above-mentioned defects of existing technologies.

[0056] 3.1 Composition and Working Principle of the Seven-Component Treatment System The post-treatment solution used in this embodiment is composed of the following seven components, each of which plays a corresponding functional role in the system: (1) Phospholipids As a core modifying component, a lipid film layer with a thickness of 1-5 μm is formed on the fiber surface. The phospholipid compound is selected from one or more of lecithin, soybean lecithin, or hydrogenated lecithin, preferably soybean lecithin. The phospholipid content is 60-98% (weight percentage), preferably 80%, with an HLB value of 8-12, preferably 10, and an iodine value of 60-100 g I2 / 100g, preferably 80 g I2 / 100g. The amphiphilic molecular structure of the phospholipid compound (hydrophobic end is a fatty acid chain, hydrophilic end is a phosphate group) allows it to be directionally adsorbed on the fiber surface, forming a lipid film layer with the hydrophobic end facing outwards. This film layer, by reducing the coefficient of friction on the fiber surface and regulating the surface tension between fibers, promotes the directional arrangement and fluffing of the microfibers on the fiber surface, giving the socks a full and delicate nap effect. The phospholipid content determines the concentration of the effective modifying component, the HLB value ensures its directional arrangement ability in the lipid film, and the iodine value reflects the unsaturation of the fatty acid chain; all three together ensure the softness and stability of the phospholipid film.

[0057] (2) Sodium alginate As a natural polysaccharide film-forming agent, sodium alginate has a molecular weight of 100,000-500,000 Da, preferably 300,000 Da. Its 1% aqueous solution (25°C) has a viscosity of 200-800 mPa·s, preferably 500 mPa·s, and an M / G ratio (mannuronic acid / guluronic acid ratio) of 0.5-2.0, preferably 1.2. Sodium alginate swells in aqueous solution to form a high-viscosity solution. When adsorbed onto the fiber surface and dried, it forms an elastic gel film. This gel film provides three-dimensional support for the fibers, preventing them from flattening during wear and washing, and maintaining the three-dimensionality and fullness of the pile. The polyhydroxy structure of sodium alginate also endows the film with good moisture retention. Molecular weight determines the film strength, viscosity controls the processing performance of the solution and the film thickness, and the M / G ratio affects the elasticity and flexibility of the gel. These three factors interact to ensure the performance of the elastic support layer.

[0058] (3) Fatty alcohol polyoxyethylene ether (AEO) As a nonionic surfactant, the AEO has an HLB value of 12-16, preferably 14; a fatty alcohol carbon chain length of C12-C18, preferably C16; and a polyoxyethylene segment molar number (EO number) of 7-15, preferably 10. The molecular structure of AEO contains hydrophobic fatty alcohol segments and hydrophilic polyoxyethylene segments, enabling it to emulsify and disperse hydrophobic components such as phospholipids and lanolin derivatives into particles with a diameter of 50-500 nm. This nanoscale uniform dispersion ensures that each component remains stable in the treatment solution and can be uniformly adsorbed onto each hair on the sock surface, avoiding mottled patterns caused by uneven treatment. The nonionic nature of AEO prevents chemical reactions with the components, maintaining the stability of the system. The HLB value determines the emulsion type (O / W type), the carbon chain length affects the compatibility between the hydrophobic end and the lipid components, and the EO number controls hydrophilicity and emulsification efficiency. The cross-limitation of these three parameters ensures the formation of a stable nanoscale emulsion.

[0059] (4) Lanolin derivatives As a natural animal wax softener, it includes one or more of lanolin alcohol, lanolin fatty acids, or polyoxyethylene lanolin, preferably lanolin alcohol, with a saponification value of 90-140 mg KOH / g, preferably 115 mg KOH / g, an acid value (for lanolin fatty acids) of 3-20 mg KOH / g or a hydroxyl value (for lanolin alcohol) of 20-60 mg KOH / g, preferably 40 mg KOH / g, and a softening point of 36-48°C, preferably 42°C. Lanolin derivatives contain a complex mixture of fatty acids and alcohols, structurally similar to phospholipid compounds, and the two can form a homogeneous mixed lipid film. Compared to a single phospholipid film, this mixed lipid film has better flexibility and compression resistance, allowing the fibers to quickly rebound after compression, maintaining a lasting soft feel and three-dimensionality. The saponification value characterizes the content of ester components, the acid value / hydroxyl value reflects the concentration of active groups and compatibility with phospholipids, the softening point determines the physical state and softness at room temperature, and the cross-limitation of the three parameters ensures the formation of a stable and homogeneous mixed lipid film with phospholipids.

[0060] (5) Medium-chain triglycerides (MCT) As a low-temperature antifreeze component, it includes one or more of caprylic / capric triglycerides, capric triglycerides, or caprylic / capric triglycerides, preferably caprylic / capric triglycerides, with a C8 / C10 ratio of 50:50 to 80:20 (by weight), preferably 60:40, a saponification value of 320-360 mg KOH / g, preferably 340 mg KOH / g, and a freezing point below -10°C, preferably -15°C. The fatty acid chain length in MCT is 8-10 carbon atoms, which has a lower freezing point (below -10°C) compared to long-chain fatty acids (16-18 carbon atoms). When MCT is incorporated into a phospholipid-lanolin mixed lipid membrane, its short-chain structure can disrupt the regular arrangement and crystallization of long-chain fatty acids, allowing the entire lipid membrane to remain in a liquid or semi-solid flexible state at low temperatures, preventing the lipid system from solidifying and hardening, and ensuring that the socks retain a soft fleece feel in winter or cold regions. The C8 / C10 ratio determines low-temperature fluidity, the saponification value characterizes the purity and molecular weight of triglycerides, and the freezing point directly reflects the antifreeze performance. These three parameters together ensure the flexibility of the lipid membrane at low temperatures.

[0061] (6) Plant sterol esters As a high-temperature stable component, it includes one or more of β-sitosterol fatty acid esters, stigmasterol fatty acid esters, or rapeseed sterol fatty acid esters, preferably β-sitosterol fatty acid esters. The sterol content is 30-50% (weight percentage), preferably 40%, the degree of esterification is 85-98%, preferably 92%, and the melting point is 100-150℃, preferably 125℃. When plant sterol esters are dispersed in a lipid membrane, their rigid sterol ring structure enhances the cohesion and viscosity of the lipid layer, preventing excessive flow or migration of lipid components at high temperatures and maintaining the uniformity and stability of the textured surface. The sterol content determines the concentration of the rigid supporting component, the degree of esterification affects compatibility and stability with the lipid membrane, and the melting point ensures that it remains in a solid or high-viscosity state within the operating temperature range (-5 to 45℃). The cross-limitation of these three parameters ensures the cohesion of the lipid layer at high temperatures.

[0062] (7) Xanthan gum As a temperature-stable thickener, xanthan gum has a molecular weight of 2 million to 20 million Da, preferably 10 million Da, and a viscosity of 1% aqueous solution (25°C) of 1200 to 1600 mPa·s, preferably 1400 mPa·s, with an ash content of 10 to 15% (by weight), preferably 12%. Xanthan gum is a polysaccharide produced by microbial fermentation, and its solution viscosity remains essentially constant within the temperature range of 5-80°C, exhibiting excellent temperature stability. When xanthan gum is used in combination with sodium alginate, the two interact through hydrogen bonds to form a more stable composite gel system, enhancing the performance stability of the elastic support layer under varying temperature conditions and preventing softening at high temperatures or embrittlement at low temperatures. Molecular weight determines the thickening effect and gel strength, viscosity reflects the solution processing performance and temperature stability, and ash content characterizes purity and compatibility with sodium alginate. The cross-constraint of these three parameters ensures a temperature-stable composite gel system.

[0063] 3.2 Proportioning of the seven components By weight, the proportions of the above seven components are as follows: sodium alginate 10-30 parts, xanthan gum 2-8 parts, phospholipids 15-40 parts, lanolin derivatives 10-35 parts, fatty alcohol polyoxyethylene ethers 5-15 parts, medium-chain triglycerides 5-20 parts, and phytosterol esters 3-15 parts.

[0064] The preferred formulation is as follows: 15-25 parts sodium alginate, 3-6 parts xanthan gum, 20-35 parts phospholipids, 15-30 parts lanolin derivatives, 8-12 parts fatty alcohol polyoxyethylene ethers, 8-15 parts medium-chain triglycerides, and 5-12 parts phytosterol esters.

[0065] The determination of the ratio is based on: (1) The ratio of sodium alginate to xanthan gum is controlled between 5:1 and 4:1. This ratio enables the two to form a composite gel system with the best elasticity and temperature stability; (2) The ratio of phospholipid compounds to lanolin derivatives is controlled between 1.5:1 and 1:1. This ratio enables the mixed lipid membrane to have both the good spreadability of phospholipids and the flexibility of lanolin; (3) Medium-chain triglycerides account for 10-25% of the total lipid components (phospholipids + lanolin + MCT + phytosterol esters). This ratio can effectively reduce the freezing point of the lipid membrane without affecting its softness; (4) Phytosterol esters account for 5-15% of the total lipid components. This ratio can provide sufficient cohesion at high temperatures without making the membrane too rigid; (5) The amount of fatty alcohol polyoxyethylene ether is 10-30% of the total hydrophobic components. This amount can fully emulsify and disperse the hydrophobic components into nano-sized particles.

[0066] The total solids content of the treatment solution should be controlled at 5-20% (by weight), and the pH value should be adjusted to 6.0-8.0. Too low a total solids content will result in an insignificant treatment effect, while too high a content will lead to excessive viscosity of the treatment solution and difficulty in impregnation. Controlling the pH value within the neutral or slightly alkaline range can ensure the stability of each component and good adsorption to the fibers.

[0067] 3.3 Preparation method of post-treatment solution The post-treatment solution is prepared using a stepwise preparation method of "hydrophilic phase preparation - hydrophobic phase preparation - surfactant mixing - emulsification mixing". The advantage of this method is that it solves the technical problem of difficulty in forming a stable and uniform emulsion when hydrophilic and hydrophobic components are directly mixed by phase separation preparation, surfactant pretreatment and stepwise mixing.

[0068] Step 3.3.1: Preparation of the hydrophilic phase Add an appropriate amount of deionized or softened water to a water bath, and then add sodium alginate and xanthan gum in the correct proportions. Both sodium alginate and xanthan gum are high-molecular-weight polysaccharides and require sufficient swelling and dissolution time. Control the water bath temperature at 20-40℃, preferably 30℃, as this temperature range accelerates dissolution without causing polysaccharide degradation. Use a mechanical stirrer to stir at 300-600 r / min for 30-90 min, preferably 450 r / min for 60 min, until the sodium alginate and xanthan gum are completely dissolved, forming a transparent or translucent viscous solution; this solution is the hydrophilic phase. Avoid excessively fast stirring during dissolution to prevent the formation of air bubbles. The criteria for complete dissolution are: no visible particulate matter, and a uniformly transparent or translucent solution.

[0069] Step 3.3.2: Preparation of the hydrophobic phase In a separate container equipped with a heating device, add phospholipids, lanolin derivatives, medium-chain triglycerides (MCTs), and phytosterol esters in the specified proportions. Since phytosterol esters are solid at room temperature, they need to be melted by heating. Heat the mixture to 50-70°C, preferably 60°C, which is above the melting point of the phytosterol esters but below the decomposition temperature of the phospholipids. At this temperature, stir at 200-400 r / min for 20-60 min, preferably at 300 r / min for 40 min, to ensure thorough mixing of the four lipid components to form a homogeneous hydrophobic phase. The introduction of MCTs reduces the viscosity of the entire lipid mixture, making mixing easier. The criteria for judging homogeneity are: no visible layering, and the system is a uniform transparent or translucent liquid.

[0070] Step 3.3.3: Emulsification treatment of the hydrophobic phase Add fatty alcohol polyoxyethylene ether (AEO) to the hydrophobic phase described above, and maintain the temperature at 50-70℃, preferably 60℃. Use a high-speed disperser or homogenizer to stir at 2000-5000 r / min for 15-45 min, preferably 3500 r / min for 30 min, to ensure thorough and uniform mixing of AEO and the hydrophobic phase. As a nonionic surfactant, AEO's hydrophobic end (fatty alcohol segment) is compatible with the lipid component, while its hydrophilic end (polyoxyethylene segment) faces outwards, preparing it for subsequent mixing with the hydrophilic phase to form a stable emulsion. This step yields a homogeneous hydrophobic phase containing the surfactant. During subsequent mixing with the hydrophilic phase, AEO will act as an emulsifier, dispersing the hydrophobic component into nanoparticles. The criterion for judging uniform mixing is that the system is homogeneous, without stratification or precipitation.

[0071] Step 3.3.4: Mixing the hydrophilic phase with the emulsified hydrophobic phase The hydrophobic phase containing surfactant obtained in step 3.3.3 is slowly added to the hydrophilic phase obtained in step 3.3.1. The addition rate is controlled at 50-200 mL / min, preferably 100 mL / min. Adding too quickly will lead to insufficient emulsification or an unstable emulsion. During the addition process, the temperature is maintained at 40-60℃, preferably 50℃, and a mechanical stirrer is used to continuously stir at a speed of 400-800 r / min, preferably 600 r / min. During the contact between the hydrophobic and hydrophilic phases, AEO plays an emulsifying role. Its hydrophobic end is adsorbed on the surface of the lipid droplets, and its hydrophilic end faces the aqueous phase, dispersing the hydrophobic component into particles with a particle size of 50-500 nm, forming a stable oil-in-water (O / W) emulsion. After all the emulsion has been added, stirring continues for 30-90 min until fully mixed, preferably 60 min, to obtain a stable composite post-treatment solution. This composite post-treatment solution is a milky white or light yellow viscous liquid that does not separate into layers after standing for 24 h. Finally, the pH of the treated solution is adjusted to 6.0-8.0, preferably 7.0, using an acid or alkali (such as acetic acid or sodium hydroxide solution). The criteria for judging complete emulsification are: the system is uniformly milky white or light yellow, without obvious stratification, and no oil-water separation occurs after standing for 1 hour.

[0072] Key points of this preparation method: Phase separation avoids the poor compatibility problem when hydrophilic polysaccharides and hydrophobic lipids are directly mixed; the surfactant is pre-mixed evenly with the hydrophobic phase, and can quickly exert emulsification when mixed with the hydrophilic phase, ensuring that the hydrophobic component is uniformly dispersed in the form of nanoparticles (50-500 nm) to form a stable O / W type emulsion; precise control of temperature and stirring speed ensures that each component does not undergo thermal degradation and can form a stable emulsion; the final composite treatment liquid is a three-functional synergistic treatment liquid that simultaneously contains an elastic support component (sodium alginate-xanthan gum), a softening modification component (phospholipid-lanolin mixed lipid), and a temperature regulating component (MCT-phytosterol ester).

[0073] 3.4 Synergistic effect of the seven components The seven components mentioned above form a synergistic effect at three levels on the fiber surface, which is the key difference between this embodiment and the prior art: The first level of synergy—the formation of the elastic underlayer: Sodium alginate and xanthan gum are first adsorbed onto the fiber surface from the treatment solution. During the drying process, the carboxyl groups of sodium alginate form hydrogen bonds with the hydroxyl or amino groups on the fiber surface, and xanthan gum and sodium alginate also interact through hydrogen bonds. Together, they form a composite gel support layer with elasticity and temperature stability. This elastic underlayer provides three-dimensional support for each fiber, preventing it from collapsing. The temperature stability of xanthan gum ensures that the viscosity and elasticity of this elastic layer remain essentially unchanged within the temperature range of 5-80℃, solving the problem of performance fluctuations of traditional single film-forming agents under temperature changes.

[0074] The second level of synergy—the construction of a soft surface layer: A mixed lipid film formed by phospholipid compounds and lanolin derivatives is uniformly distributed in nanoparticle form on the outer side of the sodium alginate-xanthan gum elastic layer under the emulsifying and dispersing effect of AEO. The lipid particles spread and fuse together on the fiber surface, forming a continuous lipid film layer. This lipid film promotes the directional alignment and fluffing of the fibers by reducing the fiber surface friction coefficient (from 0.4-0.5 to 0.15-0.25) and regulating surface tension (from 30-40 mN / m to 20-25 mN / m), giving the surface a full, delicate appearance and a soft feel.

[0075] The third level of synergy—temperature-adaptive regulation: Medium-chain triglycerides are incorporated into the lipid membrane, and their short-chain structure disrupts the regular arrangement of long-chain fatty acids, lowering the freezing point of the lipid membrane from 10-15℃ to below -5℃, ensuring the lipid layer maintains its flexibility at low temperatures; the rigid sterol ring structure of phytosterol esters enhances the high-temperature cohesion of the lipid layer, preventing flow and migration at high temperatures of 30-40℃; xanthan gum stabilizes the elastic underlayer, ensuring its constant performance with temperature changes. The synergy of these three elements ensures the stability of the entire bilayer modified structure over a wide temperature range from -5℃ to 45℃.

[0076] Overall synergistic effect: The seven components form a three-dimensional synergistic modification system of "elastic bottom layer (sodium alginate-xanthan gum) + soft top layer (phospholipid-lanolin) + temperature regulation (MCT-phytosterol ester-xanthan gum)," which enables each hair on the sock surface to obtain independent elastic support, soft coverage, and temperature adaptability, presenting a durable and stable suede effect. This multi-layered and multi-functional synergistic effect cannot be achieved by existing single or few-component treatment systems.

[0077] Step 4: Padding treatment The dyed sock blank obtained in step 2 is immersed in the post-treatment solution prepared in step 3 for 5-20 minutes at a temperature of 30-50℃, preferably 12 minutes at 40℃. Controlling the immersion temperature and time ensures that all components in the treatment solution can fully penetrate the fiber surface and interfiber spaces. Too low a temperature will result in excessively high viscosity of the lipid components, hindering penetration; too high a temperature may cause emulsion demulsification. Too short a time will result in insufficient penetration; too long a time will not provide significant benefits and will reduce production efficiency. After immersion, the sock blank is removed and passed through a roller for liquid extraction. The extraction pressure is 0.1-0.5 MPa, preferably 0.3 MPa, and the roll-off rate is controlled at 60-90%, preferably 75%. The roll-off rate refers to the percentage of the weight of the treatment solution remaining on the sock blank after extraction relative to the dry weight of the sock blank. This parameter determines the amount of each component adsorbed on the fiber surface. Too low a roll-off rate will result in insignificant treatment effects; too high a rate will lead to drying difficulties and component waste. The control method for the residual rate is achieved by adjusting the roll gap and the liquid pressure, which can be verified by weighing (weight after liquid application - dry weight) / dry weight × 100%. This step is a conventional padding process in textile finishing, and can be performed by those skilled in the art.

[0078] Step 5: Drying and Shaping The socks treated in step 4 are then dried. Drying can be used, with a drying temperature of 60-100℃ and a drying time of 15-40 min, preferably at 80℃ for 25 min; or air drying can be used, drying at room temperature (15-30℃) for 8-24 h, preferably at 20-25℃ for 12-16 h. Drying is suitable for large-scale industrial production, as it is highly efficient but energy-intensive; air drying is energy-efficient but time-consuming, suitable for small-batch production. The drying process is a crucial step in the film formation and curing of each component on the fiber surface. During drying, moisture gradually evaporates, sodium alginate-xanthan gum forms an elastic gel bottom layer on the fiber surface, phospholipid-lanolin mixed lipids spread outside the elastic layer to form a soft surface layer, and medium-chain triglycerides and phytosterol esters are evenly distributed in the lipid layer as temperature-regulating components. Ultimately, a bilayer structure of "elastic bottom layer + soft surface layer" is formed, with the temperature-regulating components embedded in the lipid layer, resulting in modified socks with temperature-adaptive properties. The criteria for determining complete drying are: the socks have no obvious moisture on the surface, feel dry and non-sticky to the touch, and achieve a constant weight (the difference between two consecutive weighings is less than 0.5%). This step is a routine drying process in textile finishing.

[0079] Step 6: Post-processing Depending on the desired nap effect, the socks obtained in step 5 can undergo moderate mechanical napping. Mechanical napping involves lightly scraping the fiber surface with steel needles or a brushing rollers, causing some fibers to break and forming richer surface nap, further enhancing the fullness and three-dimensionality of the nap. Preferably, steel needles with a needle density of 200-400 needles / cm² are used for napping, with a napping speed of 15-30 m / min, preferably 20 m / min, and 1-3 napping passes, preferably 2 passes. The principle for controlling the degree of napping is to achieve full nap while avoiding excessive napping that could reduce fiber strength. Since steps 3-5 have already formed a double-layer structure with supporting and softening functions on the fiber surface, the new nap produced by mechanical napping will also be covered and supported by this structure, achieving an effect consistent with the original nap. After mechanical napping, a setting process is performed, preferably using steam setting at a steam temperature of 100-120℃, preferably 110℃, for 5-15 minutes, preferably 10 minutes. Alternatively, heat setting can be used at a setting temperature of 130-160℃, preferably 145℃, for 3-8 minutes, preferably 5 minutes, to fix the shape and size of the socks. After setting, the dimensional stability of the socks should reach over 95%. Finally, inspection (checking for nap uniformity, dimensional specifications, softness, etc.) and packaging are carried out to obtain the finished imitation suede socks. Mechanical napping and setting are routine techniques in textile finishing, and those skilled in the art can select appropriate napping levels and setting conditions according to product requirements.

[0080] Experimental verification (based on Example 4) Experiment 1: Loft Test of Pile Surface 1. Experimental Objective By measuring the fluffiness of the faux suede socks prepared using different processing methods, the significant effect of this embodiment in improving the fullness and three-dimensionality of the faux suede was verified, and compared with traditional processing methods and natural deerskin.

[0081] 2. Preparation of experimental samples (1) Sample 1 (sample of this embodiment): Imitation deerskin socks were prepared according to steps 1 to 6 of this embodiment. The specific formula was as follows: 20 parts sodium alginate, 4 parts xanthan gum, 25 parts phospholipid compounds (soybean phospholipids, phospholipid content 80%), 20 parts lanolin derivative (lanolin alcohol), 10 parts fatty alcohol polyoxyethylene ether (HLB value 14), 10 parts medium-chain triglycerides (caprylic / capric triglycerides), and 8 parts phytosterol esters (β-sitosterol fatty acid esters). The total solid content of the treatment solution was 12%, and the pH value was 7.0. The padding temperature was 40℃, the immersion time was 12 min, and the roll-off rate was 75%. The drying temperature was 80℃, and the drying time was 25 min.

[0082] (2) Sample 2 (traditional single softener treatment): The traditional single phospholipid softener treatment method was adopted. The dyed sock blanks were immersed in a treatment solution containing 8% soybean phospholipid, the immersion temperature was 40℃, the immersion time was 12 min, the roll-off rate was 75%, the drying temperature was 80℃, and the drying time was 25 min.

[0083] (3) Sample 3 (traditional compound softener treatment): The traditional simple compound treatment method of phospholipid and lanolin was used. The dyed sock blanks were immersed in a treatment solution containing 5% soybean phospholipid and 3% lanolin alcohol (without sodium alginate, xanthan gum, medium chain triglycerides and phytosterol esters), the immersion temperature was 40℃, the immersion time was 12 min, the roll-off rate was 75%, the drying temperature was 80℃, and the drying time was 25 min.

[0084] (4) Control sample (natural deer hide): Purchase commercially available natural deer hide material as a control sample.

[0085] 3. Experimental conditions Test environment: Temperature 25±2℃, relative humidity 65±5%. Test equipment: YG141 fabric thickness gauge (for measuring pile thickness), precision electronic balance (accuracy 0.0001 g), optical microscope, surface roughness profiler. Test time: The sample was placed for 24 hours after preparation before testing.

[0086] 4. Experimental Procedure (1) Measurement of pile thickness: The pile thickness was measured at 5 different locations on each sample using a YG141 fabric thickness gauge. A pressure of 100 Pa was applied during the measurement, and the thickness values ​​were recorded. The pile thickness reflects the fluffiness of the pile.

[0087] (2) Fiber density measurement: Five 1 cm × 1 cm areas were randomly selected on the surface of each sample. The fiber surface was photographed under an optical microscope (magnification 50x). The number of fibers per unit area was calculated using image analysis software, and the average value was taken.

[0088] (3) Measurement of pile height: The average height difference (Ra value) of the pile surface was measured using a surface roughness profiler. This parameter reflects the three-dimensionality of the pile. Measurements were taken at 5 different locations for each sample, and the average value was recorded.

[0089] (4) Calculation of the comprehensive evaluation index of fluffiness: The fluffiness index is calculated by using the formula: fluffiness index = (flock thickness × pile density × flock height) / (flock thickness of control sample × pile density of control sample × flock height of control sample) × 100%. The percentage of fluffiness of each sample relative to natural deerskin is calculated.

[0090] (5) Softness test: The bending stiffness (B value, unit: gf·cm² / cm) of the sample was measured using a KES-FB (Kawabata style tester). The smaller the B value, the better the softness. Measurements were taken at three different locations for each sample, and the average value was taken.

[0091] 5. Experimental Results 5.1 Data on pile loft of velvet Note: The data in the table are the mean ± standard deviation of 5 measurements.

[0092] Figure 1 Comparison of the pile loft index of different samples.

[0093] 6. Analysis and Summary (1) In terms of the loft index, the loft index of sample 1 prepared in this embodiment is 91.2%, which is close to 100% of that of natural deerskin, and significantly higher than that of sample 2 (48.5%) treated with a single traditional softener and sample 3 (62.8%) treated with a simple compound. This verifies the significant effect of this embodiment in improving the fullness of the nap, and the loft reaches the technical target of 85-95% of that of natural deerskin.

[0094] (2) Data from the three dimensions of nap thickness, nap density, and nap height show that the sample in this embodiment is superior to the traditionally treated sample in all indicators. The nap thickness of sample 1 is 1.85 mm, the nap density is 245 fibers / cm², and the nap height is 185 μm, all of which are close to the level of natural deerskin. This indicates that the double-layer structure of sodium alginate-xanthan gum elastic support layer and phospholipid-lanolin soft surface layer can effectively support the nap, making it fully fluffy and oriented.

[0095] (3) The bending stiffness data shows that the bending stiffness of the sample in this embodiment is 0.038 gf·cm² / cm, which is only slightly higher than that of natural deerskin (0.035 gf·cm² / cm) and significantly lower than that of sample 2 (0.065 gf·cm² / cm) and sample 3 (0.052 gf·cm² / cm). This indicates that the socks prepared in this embodiment have excellent softness and a feel close to that of natural deerskin.

[0096] (4) Traditional single softener treatment (sample 2) lacks an elastic support layer, the pile is easy to flatten, the pile surface is flat, and the fluffiness is low. Traditional simple compound treatment (sample 3) uses phospholipids and lanolin at the same time, but due to the lack of sodium alginate-xanthan gum elastic support layer and temperature control components, the three-dimensionality and fullness of the pile are still insufficient.

[0097] (5) The comprehensive experimental results show that the double-layer modified structure constructed by the seven components in this embodiment can significantly improve the fluffiness and softness of the faux deerskin socks, making them close to the performance level of natural deerskin, thus verifying the effectiveness and validity of the technical solution.

[0098] Experiment 2: Temperature Adaptability Test 1. Experimental Objective To verify the performance stability of the faux suede socks prepared in this embodiment over a wide temperature range, the study focused on the effects of the temperature-adaptive control system composed of medium-chain triglycerides, phytosterol esters, and xanthan gum on the suede effect and soft feel under low temperature, room temperature, and high temperature conditions, and compared it with traditional processing methods.

[0099] 2. Preparation of experimental samples (1) Sample 1 (sample of this embodiment): Imitation deerskin socks were prepared according to steps 1 to 6 of this embodiment, with the same formula as Sample 1 in Experiment 1. This sample contains a complete temperature adaptive regulation system, including medium-chain triglycerides (low-temperature antifreeze component), phytosterol esters (high-temperature stable component) and xanthan gum (temperature stable thickener).

[0100] (2) Sample 2 (without temperature control components): No medium-chain triglycerides and phytosterol esters were added during the preparation of the post-treatment solution. To maintain the total solids content consistent with Sample 1, the amounts of phospholipids and lanolin derivatives were increased proportionally. The formula consisted of 20 parts sodium alginate, 4 parts xanthan gum, 30 parts phospholipids, 25 parts lanolin derivatives, and 10 parts fatty alcohol polyoxyethylene ether. The total solids content of the treatment solution was 12%, the pH was 7.0, and other process parameters were the same as Sample 1. This sample was used as a control to verify the role of the temperature control components.

[0101] (3) Sample 3 (traditional simple compounding treatment): The traditional simple compounding treatment method of phospholipids and lanolin was adopted, without sodium alginate, xanthan gum, medium-chain triglycerides and phytosterol esters. The formula was 5% soybean phospholipids and 3% lanolin alcohol, and other process parameters were the same.

[0102] 3. Experimental conditions Test temperature points: low temperature environment (-5℃), normal temperature environment (25℃), high temperature environment (45℃). Test environment: relative humidity 65±5%. Temperature treatment method: The samples were placed in a -5℃ refrigerator, a 25℃ constant temperature and humidity chamber, and a 45℃ constant temperature chamber for 24 hours respectively before testing. Test equipment: KES-FB Kawabata style analyzer (for measuring bending stiffness), YG141 fabric thickness gauge (for measuring pile thickness), and Dynamic Mechanical Analyzer (DMA) (for measuring storage modulus).

[0103] 4. Experimental Procedure (1) Sample pretreatment: Cut the three samples into 10 cm × 10 cm test pieces respectively, and prepare 15 pieces for each sample (5 pieces for each temperature point).

[0104] (2) Temperature equilibration treatment: The samples were placed in environments of -5℃, 25℃ and 45℃ for 24 h to equilibrate the samples to fully adapt to the test temperature.

[0105] (3) Bending stiffness test: Under the corresponding temperature environment, the bending stiffness B value (gf·cm² / cm) of the sample was measured using a KES-FB Kawabata stylet. Each sample was measured 5 times at the same temperature, and the average value was taken. Bending stiffness reflects the softness of the sample, and the smaller the B value, the softer it is.

[0106] (4) Pile thickness test: Under the corresponding temperature environment, the pile thickness (mm) of the sample is measured using a YG141 fabric thickness gauge. The pressure is 100 Pa. Each sample is measured 5 times at the same temperature, and the average value is taken.

[0107] (5) Storage modulus test: The storage modulus E' (MPa) of the sample was measured at different temperatures using a dynamic mechanical analyzer (DMA). This parameter reflects the stiffness and elasticity of the material. The test frequency was 1 Hz, the temperature scan range was -10℃ to 50℃, and the heating rate was 3℃ / min.

[0108] (6) Performance retention rate calculation: Based on the test data at 25℃ (100%), calculate the performance retention rate under low temperature (-5℃) and high temperature (45℃) conditions. Performance retention rate = (test value under extreme temperature conditions / test value under normal temperature conditions) × 100%.

[0109] (7) Observe the appearance changes: Record the appearance changes of the sample at different temperatures, including whether hardening, flow migration, color changes, etc. occur.

[0110] 5. Experimental Results 5.1 Bending stiffness and nap thickness data at different temperatures Note: The data in the table are the average ± standard deviation of 5 measurements. Softness retention and thickness retention are calculated based on data at 25°C (100%). For bending stiffness (the lower the better), softness retention = (bending stiffness at room temperature / bending stiffness at current temperature) × 100%; for nap thickness (the higher the better), thickness retention = (thickness at current temperature / thickness at room temperature) × 100%.

[0111] Figure 2 Changes in the thickness of the fleece at different temperatures.

[0112] 6. Analysis and Summary (1) In terms of the temperature adaptability of bending stiffness, the bending stiffness of sample 1 in this embodiment changes very little in the temperature range of -5℃ to 45℃ (0.038-0.042 gf·cm² / cm, with a fluctuation range of only 10.5%), and the softness retention rate is between 90.5% and 92.7%, indicating that it still maintains excellent softness under low temperature and high temperature environments. In contrast, the bending stiffness of sample 2 (without temperature control components) increases significantly at low temperature (0.088 gf·cm² / cm), and the softness retention rate is only 60.3%, showing obvious hardening; the performance degradation of sample 3 (traditional compound) is more serious at low temperature and high temperature, with a softness retention rate of only 46.4% at low temperature and only 54.7% at high temperature.

[0113] (2) In terms of the temperature stability of the pile thickness, the pile thickness of sample 1 remained between 1.78 and 1.85 mm at different temperatures, with a thickness retention rate of 96.2% to 97.3%, indicating that the fullness of the pile was very stable under temperature changes. The pile thickness of sample 2 decreased to 1.38 mm at low temperatures (75.3% retention rate) and to 1.52 mm at high temperatures (83.1% retention rate), showing obvious pile collapse. Sample 3 had the worst temperature adaptability, with a significant decrease in pile thickness at both low and high temperatures.

[0114] (3) Observation results from the appearance state show that Sample 1 remained soft at -5℃ without hardening; no lipid migration or greasy surface was observed at 45℃, and the surface treatment was uniform and stable. Sample 2 showed obvious hardening at low temperature and slight suede collapse at high temperature. Sample 3 showed severe hardening at low temperature and obvious suede collapse and greasy surface at high temperature, indicating that lipid migration occurred.

[0115] (4) Temperature Adaptability Mechanism Analysis: The excellent temperature adaptability of Sample 1 is attributed to the synergistic effect of the temperature adaptive regulation system. The short-chain structure (C8-C10) of medium-chain triglycerides (MCT) disrupts the regular arrangement and crystallization of long-chain fatty acids, allowing the lipid membrane to maintain a flexible, liquid or semi-solid state at low temperatures, preventing coagulation and hardening. The rigid sterol ring structure of phytosterol esters enhances the cohesion and viscosity of the lipid layer at high temperatures, preventing excessive flow or migration of lipid components. Xanthan gum maintains a relatively constant viscosity within the temperature range of 5-80℃, ensuring the elastic bottom layer maintains constant performance under temperature changes. The synergistic effect of these three components ensures the stability of the entire bilayer modified structure over a wide temperature range.

[0116] Experiment 3: Washability Test 1. Experimental Objective To verify the performance and durability of the faux suede socks prepared in this embodiment during repeated washing, the focus was on examining the firmness and anti-collapse ability of the double-layer structure of sodium alginate-xanthan gum elastic support layer and phospholipid-lanolin soft surface layer during washing, and comparing it with traditional treatment methods.

[0117] 2. Preparation of experimental samples (1) Sample 1 (sample of this embodiment): Imitation suede socks were prepared according to steps 1 to 6 of this embodiment, with the same formula as Sample 1 in Experiment 1. This sample contains a complete double-layer modified structure (sodium alginate-xanthan gum elastic bottom layer + phospholipid-lanolin soft top layer).

[0118] (2) Sample 2 (single softener treatment): The traditional single phospholipid softener treatment method was used, without sodium alginate, xanthan gum and other elastic support components. The dyed sock blanks were immersed in a treatment solution containing 8% soybean phospholipids for treatment, and other process parameters were the same as those of Sample 1.

[0119] (3) Sample 3 (simple compounding treatment): The traditional simple compounding treatment method of phospholipids and lanolin was adopted, without sodium alginate, xanthan gum, medium chain triglycerides and phytosterol esters. The dyed sock blanks were immersed in a treatment solution containing 5% soybean phospholipids and 3% lanolin alcohol for treatment. Other process parameters were the same as those of Sample 1.

[0120] For each sample, 40 pieces (10 cm × 10 cm) were prepared for testing with different number of washes.

[0121] 3. Experimental conditions Washing Standard: Standard washing was conducted according to GB / T 8629-2017 "Test Procedures for Household Washing and Drying of Textiles". Washing Temperature: 40±2℃. Detergent: Neutral detergent (pH 7.0±0.2), dosage 1 g / L. Washing Time: 30 min per wash. Washing Equipment: Standard household washing machine (top-loading type). Drying Method: Air drying, room temperature 25±2℃, relative humidity 65±5%. Test Environment: Temperature 25±2℃, relative humidity 65±5%. Test Time Points: Samples were taken for testing after 0 washes (initial), 5 washes, 10 washes, 15 washes, 20 washes, 25 washes, and 30 washes.

[0122] 4. Experimental Procedure (1) Sample grouping: 40 test pieces of each sample were divided into 8 groups of 5 pieces each, corresponding to test points of 0, 5, 10, 15, 20, 25 and 30 washes respectively.

[0123] (2) Standard washing treatment: Washing was performed according to GB / T 8629-2017 standard. The sample was placed in a washing machine, 1 g / L of neutral detergent was added, and the sample was washed at 40℃ for 30 min. Then it was rinsed twice with clean water for 10 min each time. After washing, it was air-dried for 24 h.

[0124] (3) Fluffiness test: At each washing cycle, the fluff thickness, fluff density and fluff height were measured using the method in Experiment 1, and the fluffiness index was calculated. Five samples in each group were measured separately, and the average value was taken.

[0125] (4) Bending stiffness test: The bending stiffness B value of the samples was measured using a KES-FB Kawabata stylet to evaluate the change in softness. Five samples in each group were measured separately, and the average value was taken.

[0126] (5) Looping resistance test: The compression rebound test method was used to evaluate the looping resistance. The sample was placed on the compressor, a pressure of 50 kPa was applied and held for 5 min, and then the pressure was released. The rebound rate of the loop thickness was measured. Rebound rate = (thickness after unloading / initial thickness) × 100%. The higher the rebound rate, the stronger the looping resistance.

[0127] (6) Appearance rating: Refer to the AATCC rating standard and use visual inspection to rate the appearance of the washed sample. The rating standard is a 5-level system (5 is the best and 1 is the worst). The evaluation indicators include the fullness of the pile, the degree of pile flattening, and the surface uniformity.

[0128] (7) Performance retention rate calculation: Based on the test data of 0 washes (initial) (100%), calculate the performance retention rate after different number of washes. For fluffiness index and compression rebound rate (the higher the better), performance retention rate = (test value after washing / initial test value) × 100%; for bending stiffness (the lower the better), softness retention rate = (initial test value / test value after washing) × 100%.

[0129] 5. Experimental Results 5.1 Performance data after different number of washes Note: The data in the table are the average of 5 measurements. The appearance rating adopts the AATCC 5-level standard, with 5 being the best and 1 being the worst. The calculation methods for the loft retention rate and softness retention rate are shown in step (7).

[0130] Figure 3 : Fluffiness and washability of different samples; Figure 4 Lodging resistance of the fibers in different samples; Figure 5 Comparison of performance retention rates after washing of different samples.

[0131] 6. Analysis and Summary (1) In terms of fluffiness retention, Sample 1 in this embodiment maintained 86.1% of its initial fluffiness after 30 standard washes, which was significantly better than Sample 2 (26.4%) and Sample 3 (40.1%). Sample 1 maintained 95.2% fluffiness after 10 washes and 90.5% after 20 washes, showing very slow performance degradation. In contrast, Sample 2's fluffiness decreased to 58.8% after 10 washes, verifying the significant advantage of this embodiment in terms of wash resistance.

[0132] (2) The compression recovery rate data shows that Sample 1 still achieved a recovery rate of 86.5% after 30 washes, indicating that the sodium alginate-xanthan gum elastic support layer provides very durable three-dimensional support for the pile. Even after repeated washing and compression, the pile can still quickly recover and is not prone to collapsing. The initial recovery rate of Sample 2 was only 82.5%, which dropped to 45.5% after 30 washes, indicating that the pile lacking an elastic support layer is prone to collapsing and difficult to recover. Although Sample 3 contains phospholipids and lanolin, due to the lack of an elastic support layer, its recovery rate was only 53.8% after 30 washes.

[0133] (3) From the trend of bending stiffness, it can be seen that the bending stiffness of sample 1 after 30 washes is 0.050 gf·cm² / cm, which only increased from the initial 0.038 to 0.050, an increase of 31.6%, and the softness retention rate is 76.0%, indicating that the softness is well maintained. The bending stiffness of samples 2 and 3 increased even more, reaching 107.7% and 115.4% respectively, and the softness retention rates were only 48.1% and 46.4% respectively, indicating that the softener components were lost in large quantities during the washing process, and the softness decreased significantly.

[0134] (4) The appearance rating results show that Sample 1 maintained a grade 4 appearance quality after 30 washes, with good nap fullness, slight nap flattening, and uniform surface. Sample 2's appearance rating dropped to grade 1 after 30 washes, with severe nap collapse, a large amount of nap flattening, and poor surface smoothness. Sample 3's appearance rating was grade 1-2 after 30 washes, with a significant decrease in nap effect.

[0135] (5) Mechanism analysis of wash resistance: Sample 1's excellent wash resistance is attributed to the synergistic effect and strong bond of the double-layer modified structure. The sodium alginate-xanthan gum elastic bottom layer is firmly bonded to the fiber surface through hydrogen bonds, making it difficult to fall off during washing and providing lasting three-dimensional support for the pile. The phospholipid-lanolin mixed lipid membrane forms a soft surface layer on the outside of the elastic layer, and the two layers interact through van der Waals forces and hydrogen bonds to form a stable multi-layer composite structure. Even if some lipid components are lost during washing, the elastic bottom layer can still maintain its support for the pile, making the pile effect decay slowly. In contrast, Samples 2 and 3 lack an elastic support layer, and the single softener is lost in large quantities during washing, causing the pile to lose support and quickly flatten, resulting in a rapid decay of the pile effect.

[0136] (6) Comprehensive experimental results show that this embodiment significantly improves the washability of imitation suede socks by constructing a double-layer modified structure of sodium alginate-xanthan gum elastic bottom layer and phospholipid-lanolin soft surface layer. After 30 standard washes, it can still maintain more than 80% of the initial nap effect, while the nap effect of traditional treatment methods decreases by more than 50% after 10 washes. This verifies the effectiveness and efficacy of the multi-level synergistic modification strategy in improving product durability, and provides technical support for the production of high-quality, long-life imitation suede socks.

[0137] The embodiments of the present invention have been described above. However, the embodiments are not limited to the specific implementation methods described above. The specific implementation methods described above are merely illustrative and not restrictive. Those skilled in the art can make more equivalent embodiments under the guidance of the present embodiments, and all of them are within the protection scope of the present embodiments.

Claims

1. A method for preparing imitation suede socks, comprising the steps of sock blank weaving, dyeing, post-treatment, drying and setting, and finishing, characterized in that, The post-treatment step uses a temperature-adaptive post-treatment solution to treat the dyed sock blanks. The post-treatment solution is prepared from the following components in parts by weight: 10-30 parts sodium alginate, 2-8 parts xanthan gum, 15-40 parts phospholipids, 10-35 parts lanolin derivatives, 5-15 parts fatty alcohol polyoxyethylene ethers, 5-20 parts medium-chain triglycerides, and 3-15 parts phytosterol esters. The phospholipid compound is selected from one or more of lecithin, soybean lecithin, or hydrogenated lecithin; the lanolin derivative is selected from one or more of lanolin alcohol, lanolin fatty acid, or polyoxyethylene lanolin; the medium-chain triglyceride is selected from one or more of caprylic triglyceride, capric triglyceride, or caprylic-capric triglyceride; and the phytosterol ester is selected from one or more of β-sitosterol fatty acid ester, stigmasterol fatty acid ester, or rapeseed sterol fatty acid ester.

2. The preparation method according to claim 1, characterized in that, The preferred proportions of the components in the post-treatment solution are as follows: 15-25 parts sodium alginate, 3-6 parts xanthan gum, 20-35 parts phospholipids, 15-30 parts lanolin derivatives, 8-12 parts fatty alcohol polyoxyethylene ethers, 8-15 parts medium-chain triglycerides, and 5-12 parts phytosterol esters.

3. The preparation method according to claim 1, characterized in that, The preparation method of the post-treatment solution includes the following steps: Sodium alginate and xanthan gum are stirred in a water bath at 20-40℃ for 30-90 minutes until completely dissolved to form a hydrophilic phase. Phospholipids, lanolin derivatives, medium-chain triglycerides, and phytosterol esters are stirred at 50-70°C for 20-60 minutes to form a hydrophobic phase. Add fatty alcohol polyoxyethylene ether to the hydrophobic phase and stir at high speed at 50-70℃ for 15-45 min; The hydrophobic phase was added to the hydrophilic phase at a rate of 50-200 mL / min, and the mixture was stirred at 40-60℃ for 30-90 min to obtain the post-treatment solution.

4. The preparation method according to claim 1, characterized in that, The total solids content of the post-treatment solution is 5-20%, and the pH value is 6.0-8.

0.

5. The preparation method according to claim 1, characterized in that, The phospholipid compounds have a phospholipid content of 60-98%, an HLB value of 8-12, and an iodine value of 60-100 g I2 / 100g.

6. The preparation method according to claim 1, characterized in that, The sodium alginate has a molecular weight of 100,000-500,000 Da, a viscosity of 200-800 mPa·s at 25°C for a 1% aqueous solution, and an M / G ratio of 0.5-2.0; the xanthan gum has a molecular weight of 2,000,000-20,000,000 Da, a viscosity of 1200-1600 mPa·s at 25°C for a 1% aqueous solution, and an ash content of 10-15%.

7. The preparation method according to claim 1, characterized in that, The fatty alcohol polyoxyethylene ether has an HLB value of 12-16, a fatty alcohol carbon chain length of C12-C18, and a polyoxyethylene segment molar number of 7-15.

8. The preparation method according to claim 1, characterized in that, The saponification value of the lanolin derivative is 90-140 mg KOH / g, the acid value is 3-20 mg KOH / g or the hydroxyl value is 20-60 mg KOH / g, and the softening point is 36-48℃.

9. The preparation method according to claim 1, characterized in that, The medium-chain triglyceride has a C8 / C10 ratio of 50:50 to 80:20, a saponification value of 320-360 mg KOH / g, and a freezing point below -10℃; the phytosterol ester has a sterol content of 30-50%, a degree of esterification of 85-98%, and a melting point of 100-150℃.

10. A type of imitation suede sock prepared by the preparation method according to any one of claims 1-9.

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