Three-dimensional texture special-effect long-fiber berber fleece-like single-sided printed product and preparation method thereof

Abstract

The invention relates to the field of spinning, and discloses a three-dimensional texture special-effect long-fiber berber fleece-like single-sided printed product which comprises a polyester long-fiber base material, the cross-linked adhesive layer is coated on the single surface of the polyester long fiber base material; the short fiber fluff is electrostatically implanted into the cross-linked adhesive layer; the cross-linked adhesive layer is prepared from the following components in parts by mass: 90 to 100 parts of polyvinyl butyral; 350 to 450 parts of benzaldehyde or p-methoxybenzaldehyde; 180 to 220 parts of hydrazone acetic acid; 1 to 3 parts of a nonionic surfactant; the polyester long fiber base material is a berber fleece-like fabric with the gram weight of 220-320g / m, and the short fiber fluff is nylon 6 or nylon 66 short fiber. By designing a cross-linking glue solution system, polyvinyl butyral and an aromatic aldehyde cross-linking agent are subjected to a synergistic reaction, so that firm adhesion and structural stability of a glue layer on a polyester long-fiber base material are realized, and the appearance and use effects that fluff does not fall off and patterns do not crack are obtained.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of textiles, in particular to a three-dimensional texture special-effect long fiber imitation sheepskin single-sided printed product and a preparation method thereof. BACKGROUND

[0002] The long fiber imitation sheepskin single-sided printed product is a composite textile material that uses polyester or nylon long fibers as a base, constructs the texture of the pile surface through electrostatic flocking technology, and realizes the integration of decoration and function by combining pattern printing technology. This product has a wide market application in winter clothing, hats, shoes, and home supplies due to its soft and full touch, excellent warmth retention, and strong pattern expression.

[0003] In particular, in the current context of lightweight and high comfort requirements, long fiber imitation sheepskin materials require higher adhesion, flexibility, and pattern stability of the glue layer due to their long pile and high curling degree. To achieve clear patterns and upright pile, the glue solution must have a good balance of adhesion and flowability. At the same time, due to the sensitivity of the long fiber structure to electric fields, it is more prone to flocking deviation, pattern blurring, and edge out-of-focus during electrostatic flocking, which affects the overall aesthetic appeal and quality consistency.

[0004] The commonly used glue solution formulations such as acrylic and water-based polyurethane systems have obvious shortcomings when dealing with this type of long fiber imitation sheepskin material. For example, the high film rigidity easily leads to pile collapse and stiff hand feeling; the simple cross-linking structure results in poor water resistance, and the glue layer is prone to peeling after long-term use; and the traditional glue solution lacks sufficient support for pile orientation, leading to frequent pattern blurring.

[0005] In addition, due to the complex conditions such as local solvent residue and pile compression after printing, the glue solution lacks good adaptability and structural adjustment ability, which easily leads to problems such as blistering, glue penetration, and adhesion reduction during subsequent drying or washing, seriously affecting the consistency and durability of the final product. SUMMARY

[0006] To overcome the shortcomings of the prior art, the present application provides a three-dimensional texture special-effect long fiber imitation sheepskin single-sided printed product and a preparation method thereof, which solves the problems of poor adhesion, insufficient flexibility, pattern blurring, and poor water resistance of the glue layer of the existing flocking glue solution in long fiber imitation sheepskin single-sided printed products.

[0007] To achieve the above purpose, the present application realizes the following technical solutions: a three-dimensional texture special-effect long fiber imitation sheepskin single-sided printed product, comprising: a polyester long fiber base material; a cross-linked glue layer coated on one side of the polyester long fiber base material; Short fiber fluff electrostatically implanted in the crosslinked adhesive layer; The crosslinked adhesive layer is composed of the following components by mass parts: Polyvinyl butyral 90-100 parts; Benzaldehyde or p-methoxybenzaldehyde 350-450 parts; Hydrozone acetic acid 180-220 parts; Nonionic surfactant 1-3 parts.

[0008] Preferably, the polyester long fiber base material is a fake sheep down fabric with a grammage of 220-320 g / m², and the short fiber fluff is nylon 6 or nylon 66 short fiber with a length of 0.8-1.4 mm.

[0009] The preparation method of the stereotexture special-effect long-fiber fake sheep down single-sided printed product comprises the following steps: S1. Prepare the glue solution, mix polyvinyl butyral, benzaldehyde or p-methoxybenzaldehyde, hydrozone acetic acid, and nonionic surfactant in a mixed solvent of ethanol and water; S2. Apply the obtained glue solution to one side of the polyester long fiber base material; S3. Dry the coated base material; S4. Perform electrostatic flocking on the surface of the adhesive layer; S5. After flocking, perform heat treatment; S6. Steam fixation treatment is performed on the material; S7. Complete the washing and drying steps to obtain the finished product.

[0010] Preferably, S1 preparation includes: Add polyvinyl butyral, benzaldehyde or p-methoxybenzaldehyde, hydrozone acetic acid, and nonionic surfactant to the solvent system in proportion; The solvent system is a mixture of ethanol and water, with a volume ratio of ethanol to water of 3:1; After adding, use a blender to stir at 600-800 rpm for 20-30 minutes to obtain the glue solution.

[0011] Preferably, S2 coating is performed by a knife coater, and the knife coater parameters are: The knife thickness is 0.2-0.4 mm, the glue application rate is 10-15 m / min, and the unit area glue application amount is controlled at 30-40 g / m²; The coated base material is preliminarily dried in a hot air drying device, with a temperature setting of 40-50°C and a duration of 3-5 minutes.

[0012] Preferably, S3 drying includes: The coated substrate enters a drying chamber, the temperature in the drying chamber is controlled at 40-50 DEG C, the duration is 3-5 minutes, and the drying air flow rate is 0.5-1.0 m / s.

[0013] Preferably, the electrostatic flocking machine is used in S4, the flocking voltage is 20-25 kV, the environmental humidity in the flocking area is 50-65%, and the flocking time is 3-5 minutes.

[0014] Preferably, the heat treatment step in S5 is carried out by a hot air circulating oven, the temperature is controlled at 70-90 DEG C, and the treatment time is 8-12 minutes.

[0015] Preferably, the steam tunnel is used in S6, the steam temperature is controlled at 100 DEG C, the steam pressure is 0.2-0.3 MPa, and the treatment time is 10-15 minutes.

[0016] Preferably, the spray type washing machine is used in S7, the washing temperature is 30-40 DEG C, the washing time is not more than 3 minutes, the drum type dryer is used for drying, the temperature is controlled at 90-100 DEG C, and the drying time is 5-10 minutes.

[0017] The application provides a three-dimensional texture special-effect long fiber imitation sheep down single-sided printing product and a preparation method. 1. The application designs a cross-linking glue system, realizes firm adhesion and structural stability of the glue layer on the polyester long fiber substrate by synergistic reaction of polyvinylidene chloride and aromatic aldehyde cross-linking agent, and obtains the appearance and use effect of no shedding of the down and no cracking of the pattern.

[0018] 2. The application realizes the improvement of the flexibility of the glue layer and does not affect the flocking performance by selecting a non-ionic surfactant with good affinity and a hydrazone softness regulator to synergistically stabilize the glue structure, and obtains the effects of soft and fluffy, comfortable and elastic recovery of the finished product.

[0019] 3. The application improves the positioning and maintaining ability of the glue system to the short fiber down by optimizing the rheological properties and initial adhesion of the glue system, realizes the forming effect of clear pattern boundary and obvious three-dimensional effect in the electrostatic flocking process, and obtains the product performance of outstanding texture and clear pattern.

[0020] 4. The application improves the curing rate and cross-linking density of the glue system under the conditions of heat treatment and steam by introducing hydrazone acetic acid as a reaction type cross-linking promoter, realizes the complete setting of the glue layer structure in a short time, and obtains the terminal performance of excellent color fastness and stable glue layer without stickiness. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a schematic diagram of the method steps of the application. DETAILED DESCRIPTION

[0022] The technical solutions of the present application will be described clearly and completely below in combination with the drawings of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0023] Please refer to the drawings of the present application Figure 1 The present application provides a three-dimensional texture special effect long fiber imitated sheep down single-sided printed product, comprising: A polyester long fiber base material; the polyester long fiber base material is an imitated sheep down fabric with a grammage of 220-320 g / m², and the short fiber pile is nylon 6 or nylon 66 short fiber with a length of 0.8-1.4 mm. A cross-linked glue layer coated on one side of the polyester long fiber base material; Short fiber pile electrostatically implanted in the cross-linked glue layer; The cross-linked glue layer is composed of the following components in parts by mass: Polyvinyl butyral 90-100 parts; Benzaldehyde or p-methoxybenzaldehyde 350-450 parts; Hydra acetic acid 180-220 parts; Non-ionic surfactant 1-3 parts.

[0024] The preparation method of the three-dimensional texture special effect long fiber imitated sheep down single-sided printed product comprises the following steps: S1. Prepare a glue solution, mix polyvinyl butyral, benzaldehyde or p-methoxybenzaldehyde, hydra acetic acid, and non-ionic surfactant uniformly in a mixed solvent of ethanol and water; including: Add polyvinyl butyral, benzaldehyde or p-methoxybenzaldehyde, hydra acetic acid, and non-ionic surfactant to the solvent system in proportion; The solvent system is mixed by ethanol and water, and the volume ratio of ethanol to water is 3:1; After adding, use a blender to stir at 600-800 rpm for 20-30 minutes to obtain the glue solution.

[0025] S2. Apply the obtained glue solution to one side of the polyester long fiber base material; S2 application is carried out by a doctor blade coater, and the parameters of the doctor blade coater are: The doctor blade thickness is 0.2-0.4 mm, the glue application rate is 10-15 m / min, and the unit area glue application amount is controlled at 30-40 g / m²; The coated base material is preliminarily dried in a hot air drying device, the temperature is set at 40-50℃, and the duration is 3-5 minutes.

[0026] S3. Dry the coated base material; including: The coated substrate is introduced into a drying chamber, the temperature in the drying chamber is controlled at 40-50°C, the duration is 3-5 minutes, and the drying air flow rate is 0.5-1.0 m / s.

[0027] S4. Electrostatic flocking is performed on the surface of the glue layer; an electrostatic flocking machine is used, the flocking voltage is 20-25 kV, the environmental humidity in the flocking area is 50-65%, and the flocking time is 3-5 minutes.

[0028] S5. After the flocking is completed, heat treatment is performed; the heat treatment step is performed by a hot air circulating oven, the temperature is controlled at 70-90°C, and the treatment time is 8-12 minutes.

[0029] S6. Steam fixation treatment is performed on the material; a steam tunnel is used to complete the treatment, the steam temperature is controlled at 100°C, the steam pressure is 0.2-0.3 MPa, and the treatment time is 10-15 minutes.

[0030] S7. The washing and drying steps are completed to obtain the finished product; a spray-type washing machine is used, the washing temperature is 30-40°C, and the washing time is not more than 3 minutes; a drum-type drying machine is used for drying, the temperature is controlled at 90-100°C, and the drying time is 5-10 minutes.

[0031] Based on the same inventive concept described above, the following examples are given: Example One: Product preparation process suitable for medium weight imitation sheep kid fabric substrate; An imitation sheep kid polyester long fiber fabric with a weight of 280 g / m² is selected as the substrate. A solution system is prepared: the volume ratio of ethanol to water is 3:1, and the solution is stirred uniformly for standby use.

[0032] S1. Glue solution preparation: add polyvinyl butyral 95 parts, p-methoxybenzaldehyde 400 parts, hydrazone acetic acid 200 parts, and non-ionic surfactant 2 parts into a high-speed dispersion device. Slowly pour into the premixed solution, set the speed to 700 rpm, and stir for 25 minutes. The glue solution is semi-transparent and slightly turbid, with slight stickiness, no stringing, indicating stable rheological properties.

[0033] S2. Glue solution coating: uniformly coat the fabric on one side by a doctor blade coater, set the doctor blade to 0.3 mm thickness. Set the line speed to 12 m / min. The unit sizing amount is controlled at about 35 g / m². Immediately after coating, send to a hot air drying device, set the drying temperature to 45°C, medium air force, and dry for 4 minutes.

[0034] S3. Electrostatic flocking: transfer to the flocking section, use an electrostatic flocking machine with a voltage of 23 kV, use nylon 66 flocking with a length of about 1.2 mm, and control the environmental humidity at 60%. The flocking time is maintained for 3 minutes. During the process, the flocking is upright and evenly distributed without agglomeration.

[0035] S4 Heat treatment + steam fixation: After tufting, put into the hot air oven, temperature control at 85°C, process for 9 minutes. Then enter the steam fixation tunnel, steam temperature set to 100°C, pressure 0.25 MPa, for 12 minutes.

[0036] S5 Washing and drying: The washing temperature is set to 35°C, and the time is not more than 3 minutes to ensure that the adhesive layer is not affected. Then enter the drum dryer, the temperature is set to 95°C, and the drying is completed within 8 minutes.

[0037] Example Two: Three-dimensional texture enhancement process for light and thin substrates: Select white imitation sheepskin fabric with a grammage of 240 g / m² as the carrier layer, suitable for spring and autumn clothing products.

[0038] S1 Preparation of adhesive solution: In a stainless steel stirring barrel, add polyvinyl butyral 98 parts, benzaldehyde 370 parts, hydrazone acetic acid 190 parts, and surfactant 1.5 parts. Add liquid first and then powder, do not change the order. The stirrer is turned to 680 rpm, and the control time is 28 minutes. The adhesive solution is slightly thick and has a slight colloidal feeling.

[0039] S2 Coating operation: Apply the adhesive solution directly to the fabric surface through the doctor blade coating system. The doctor blade thickness is adjusted to 0.25 mm, and the running speed is set to 11 m / min. The adhesive amount is controlled at about 32 g / m². Enter the hot air drying section, set the temperature to 42°C, drying time 4 minutes, low air speed to avoid bulging.

[0040] S3 Electrostatic flocking: The flocking is made of nylon 6 material with a length controlled within 1.0 mm, suitable for pattern detail processing. The electrostatic voltage is 20 kV, and the air humidity is slightly low, about 52%. Flock for 3.5 minutes. After completion, the surface is crisp, the pile is upright, and the pattern edge is clean.

[0041] S4 Curing treatment: The heat treatment temperature is adjusted to 75°C, and the time is set to 10 minutes to ensure that the adhesive has been cured for half of the time. Then enter the steam tunnel for crosslinking and setting, set the temperature to 100°C, pressure 0.22 MPa, time 10 minutes.

[0042] S5 Washing and drying: Spray washing equipment treatment for 2 minutes, temperature control at 36°C. The latter drying uses a drum equipment, time 6 minutes, temperature control at 92°C.

[0043] Example Three: High adhesion scheme for heavy weight imitation sheepskin fabric: Use a dark gray imitation sheepskin substrate with a grammage of 320 g / m², aiming for a product with strong wash resistance and high adhesion.

[0044] S1 glue solution preparation: polyvinyl butyral 100 parts, p-methoxy benzaldehyde 430 parts, hydrazone acetic acid 220 parts, non-ionic surfactant 3 parts are sequentially added into the mixed solvent. Stir for 25 minutes at 750 rpm with a high-speed dispersing machine to form a light white homogeneous liquid.

[0045] S2 coating and drying: the thickness of the 0.4 mm doctor blade is used, the running speed is set to 10 m / min, and the unit sizing amount is increased to 40 g / m2 to ensure the attachment of the pile. The initial drying is set to 50°C for 5 minutes, and the air speed is slightly strong.

[0046] S3 flocking process: 1.4 mm nylon 66 short fibers are used. The electrostatic voltage is adjusted to 25 kV, and the humidity is controlled at 63%. The time is set to 5 minutes. The short pile angle is more stable, and the flocking density is high.

[0047] S4 heat setting and fixing: enter the hot air circulating oven for 12 minutes, the temperature is set to 90°C. The glue layer is fully cured. Then transfer to the steam tunnel, the temperature is 100°C, the pressure is 0.3 MPa, and the treatment time is 15 minutes, and the crosslinking is completed.

[0048] S5 cleaning and drying: the water washing temperature is kept at 40°C for about 3 minutes. The drying machine temperature is 100°C, and the time is 10 minutes, and the drying is complete without residual water vapor.

[0049] Comparative Example 1-1: The difference between this comparative example and Example 1 is that hydrazone acetic acid is not added when preparing the glue solution, and the rest of the components and operating conditions are the same. The specific operation is as follows: Polyvinyl butyral 95 parts, p-methoxy benzaldehyde 400 parts, and non-ionic surfactant 2 parts are added to a solvent formed by mixing ethanol and water in a volume ratio of 3:1, and stirred at 700 rpm for 25 minutes to obtain a glue solution. The subsequent coating, drying, electrostatic flocking, heat treatment, steam fixing, washing and drying operations are carried out according to Example 1.

[0050] Comparative Example 1-2: The difference between this comparative example and Example 1 is that the non-ionic surfactant used in the glue solution is replaced by an equal amount of cationic surfactant, and the rest of the proportions and processes are the same.

[0051] Polyvinyl butyral 95 parts, p-methoxy benzaldehyde 400 parts, hydrazone acetic acid 200 parts and cationic surfactant 2 parts are added to the mixed solvent (ethanol and water in a volume ratio of 3:1), and the stirring conditions are kept at 700 rpm for 25 minutes. Then perform coating, drying and subsequent steps according to Example 1.

[0052] Comparative Example 1-3: The difference between this comparative example and Example 1 is that the electrostatic flocking voltage is reduced to 15 kV, and the rest of the formulation and process flow remain unchanged.

[0053] After the same formulation and drying operation as in Example 1, the dried adhesive layer substrate is sent to the electrostatic flocking process, with the flocking voltage set to 15 kV, humidity of 60%, and time of 3 minutes. The subsequent heat treatment, steam fixation, and drying steps are consistent with Example 1.

[0054] Comparative Example 2-1: The difference between this comparative example and Example 2 is that no non-ionic surfactant is added to the glue solution.

[0055] Polyvinyl butyral 98 parts, benzaldehyde 370 parts, hydrazone acetic acid 190 parts are added to a mixed solvent of ethanol and water (volume ratio 3:1), with stirring speed 680 rpm and stirring time 28 minutes. The remaining steps including coating, drying, flocking, heat treatment, steam fixation, washing, and drying are the same as in Example 2.

[0056] Comparative Example 2-2: The difference between this comparative example and Example 2 is that the volume ratio of ethanol to water in the solvent system is adjusted to 1:1.

[0057] The formulation in Example 2 is used, with the addition of polyvinyl butyral, benzaldehyde, hydrazone acetic acid, and non-ionic surfactant, but the solvent is a 1:1 mixture of ethanol and water. The stirring, sizing, drying, flocking, and subsequent steps remain consistent with Example 2.

[0058] Comparative Example 2-3: The difference between this comparative example and Example 2 is that the short fiber flock used in electrostatic flocking is replaced with polyester short fibers, with a length of 1.0 mm.

[0059] The formulation, coating, drying, and process parameters remain unchanged. Only the type of flock is changed in the S4 electrostatic flocking stage, and the rest of the operation flow is the same as in Example 2.

[0060] Comparative Example 3-1: The difference between this comparative example and Example 3 is that the amount of aromatic aldehyde used in the cross-linking glue solution is reduced to 250 parts.

[0061] Polyvinyl butyral 100 parts, p-methoxybenzaldehyde 250 parts, hydrazone acetic acid 220 parts, and non-ionic surfactant 3 parts are added to the solvent and stirred, with the glue solution preparation process consistent with Example 3. The subsequent steps including coating, drying, flocking, heat treatment, steam fixation, washing, and drying operations remain consistent.

[0062] Comparative Example 3-2: The difference between this comparative example and Example 3 is that the heat treatment process is cancelled, and the flocking is directly subjected to steam fixation after flocking.

[0063] The formula, glue solution preparation, sizing, and electrostatic flocking steps are consistent with Example 3. After S4 flocking is completed, no heat treatment is performed, and S5 steam fixation treatment is directly performed. The remaining washing and drying processes are the same.

[0064] Comparative Example 3-3: The difference between this comparative example and Example 3 is that the steam fixation treatment is omitted, and only hot air setting is performed.

[0065] After electrostatic flocking is completed, hot air circulation oven heat treatment is performed according to Example 3. Subsequently, no steam fixation step is performed, and water washing and drying operations are directly performed, with the remaining parameters remaining the same.

[0066] Experimental 1: Adhesion of glue layer test experimental description: The purpose of this experiment is to evaluate the effect of the aromatic aldehyde and hydrazone acetic acid synergistic crosslinking system in the glue solution formula of the present application on the adhesion of the glue layer. This experiment relies on the standard crosshatch method test to simulate the peeling stress under actual use scenarios and compares the performance of samples prepared in the examples and comparative examples.

[0067] The crosshatch method used in the experiment is based on the GB / T9286-2021 standard.

[0068] The experimental steps are as follows: First, cut each group of samples into a rectangular size of 50mm x 100mm for standby. The selected samples include Example 1, Comparative Example 1-1 (without hydrazone acetic acid), and Comparative Example 3-1 (reduced aromatic aldehyde dosage).

[0069] Next, use a standard multi-blade crosshatch cutter to cut 6 lines in the vertical and horizontal directions on the surface of the sample glue layer, forming a complete grid area, and the crosshatch depth reaches the substrate surface.

[0070] Then, take a standard adhesive tape (model 3M600) and press it tightly and evenly against the crosshatched area. Pull up the tape and quickly tear it off, and observe the glue layer peeling off the grid area.

[0071] Finally, according to the standard grading rules of GB / T9286, record and statistics the adhesion grade of each sample, which is divided into 0-5 levels, and the lower the value, the worse the adhesion.

[0072] The experimental results show that the aromatic aldehyde and hydrazone acetic acid synergistic crosslinking system used in Example One has obvious advantages in adhesive layer adhesion. In the grid test results, the sample of Example One shows a high adhesion level, and the integrity of the adhesive layer in the grid area is good, with only a small amount of peeling at the edge. This result verifies that the two-component crosslinking structure forms a dense three-dimensional network inside the adhesive layer, effectively improving the cohesive force and interfacial bonding strength of the adhesive.

[0073] Comparative Example 1-1 does not add hydrazone acetic acid, and there is more peeling at the boundary of the grid area, and the adhesion level decreases significantly. This shows that in the absence of hydrazone acetic acid, the crosslinking degree of the glue solution is insufficient, the spatial structure is loose, and it is difficult to withstand the peeling stress. Especially when there are micro-defects or stress concentration at the interface between the adhesive layer and the substrate, damage is more likely to occur.

[0074] In addition, the amount of aromatic aldehyde in Comparative Example 3-1 is reduced, and the grid test shows between Example One and Comparative Example 1-1, further illustrating that the change in the content of aromatic aldehyde directly affects the crosslinking density and the stability of the adhesive layer network structure. The Schiff base crosslinking structure formed by the reaction of aromatic aldehyde and hydrazone acetic acid not only provides sufficient spatial rigidity, but also effectively suppresses the stress concentration and crack propagation tendency of the adhesive layer. The above results are highly consistent with the design idea of the present application, further confirming the important role of the synergistic action of aromatic aldehyde and hydrazone acetic acid in improving the adhesion of the adhesive layer.

[0075] Experimental 2 Pattern definition and stereoscopic effect test This experiment is used to test the pattern definition and stereoscopic effect of the flocked product under different flocking parameters and formula conditions, further verifying the necessity of the synergistic optimization of adhesive adhesion and electrostatic flocking parameters. Special attention is paid to the influence of flocking effect on the decorative properties of the product.

[0076] Experimental steps: The sample size is 50mm x 50mm, and a standard flocking template is used for pattern sizing and flocking.

[0077] The flocking template used is a square with clear geometric boundaries and a combination of letters, which facilitates the observation of the boundary profile.

[0078] The samples include Example One (standard formula and electrostatic voltage), Comparative Example 1-3 (reduced electrostatic voltage), and Comparative Example 2-3 (fleece material replaced with polyester).

[0079] After flocking, the sample is naturally dried for 24 hours. An industrial microscope (50x magnification) is used to take pictures of the sample pattern boundary. Image processing software (ImageJ) is used to assist in measuring the width of the blurred boundary.

[0080] Visual observation evaluation of the samples was recorded, including the straightness, fullness and visual stereoscopic effect of the pile. The subjective evaluation was given by 3 operators (5-point scale).

[0081] The sample of Example 1 showed excellent performance in both pattern definition and pile stereoscopic effect. Microscopic observation data showed that the blur width of the pattern boundary was the smallest, the pile arrangement was regular, and the stereoscopic effect was obvious. The results fully proved that in the formulation system of the present application, the moderate adhesion of the glue solution combined with reasonable electrostatic flocking voltage could realize the rapid directional implantation of the pile, effectively inhibit the displacement or lodging of the pile during the implantation process, and thus ensure the sharpness of the pattern edge and the overall visual effect.

[0082] In contrast, when the flocking voltage of Comparative Example 1-3 was reduced to 15 kV, the blur width of the pattern boundary increased significantly, the pile arrangement was loose, and the stereoscopic effect was poor. This was mainly due to insufficient flocking voltage, reduced charge amount carried by the pile, and slowed down movement speed, which made it difficult to break through the air resistance to form vertical directional implantation. Even if the glue solution had certain adhesion, it could not make up for the implantation failure caused by insufficient electric field strength, resulting in the diffusion of the pattern boundary and the uneven distribution of the pile.

[0083] In addition, when the flocking fiber of Comparative Example 2-3 was replaced by polyester instead of nylon 6, although the blur width of the pattern boundary did not significantly increase, the stereoscopic effect and visual fullness of the pile decreased significantly. This phenomenon was mainly due to the difference in dielectric properties of different materials of short fibers. The surface resistance of polyester short fibers was higher, and the charge carrying capacity and polarization response were weaker than nylon 6, resulting in insufficient directional and vertical stability of the short fibers during electrostatic flocking. Therefore, even if the adhesion of the glue layer was good, the material properties of the pile itself were still one of the key factors affecting the flocking quality. This further illustrates the comprehensive optimization idea of the present application in the design of the material system, i.e. the glue solution formulation, the flocking process parameters and the pile material need to be matched to achieve the best appearance quality of the finished product.

[0084] Experimental 3: Comparison of the flexibility of the glue layer and the hand feeling of the finished product This experiment aims to evaluate the influence of different glue solution formulations on the softness and hand feeling of the product. The synergistic effect of hydra acetic acid and non-ionic surfactant in the glue solution on the flexibility of the glue layer is investigated. Objective physical tests and subjective evaluation are combined.

[0085] Experimental steps: The samples were cut into 100mm x 100mm and divided into Example 2, Comparative Example 2-1 (without non-ionic surfactant), and Comparative Example 1-2 (the surfactant was replaced by a cationic type).

[0086] The objective test part was carried out according to GB / T18318.1-2009 standard for bending stiffness test. The sample was placed on the bending test device, and the maximum bending force under a certain load (unit: mN) was measured. The smaller the bending force, the better the softness.

[0087] The subjective evaluation was carried out by 5 evaluators for hand feeling score (1-5 point system), mainly investigating three dimensions: softness, smoothness, and skin adhesion. The average value was taken.

[0088] The softness and hand feeling test results of different samples: The experimental results further verified the effectiveness of the formula of the present application in improving the flexibility of the adhesive layer. The sample of Example 2 showed the lowest bending stiffness in the physical test, and the subjective hand feeling score was also high. When the adhesive layer was bent under stress, the deformation was uniform, and there was no obvious hard and brittle or fracture tendency. This performance was mainly due to the three-dimensional cross-linked network formed by the synergistic reaction of hydra acetic acid and aromatic aldehyde in the glue solution, which provided structural stability while retaining a certain chain flexibility, avoiding the defect of traditional high cross-linking density glue layer that was easy to be hard and brittle.

[0089] In Comparative Example 2-1, no non-ionic surfactant was added, resulting in more compact arrangement of molecular chains and lack of interface lubricating structure during film formation, further increasing the hardness of the adhesive layer. In the test results, the bending stiffness of this sample was significantly higher than that of the examples, and the subjective evaluation also generally reflected that the adhesive layer was hard and the surface was dry. This shows that in the design of the glue solution, in addition to the control of the cross-linking reaction, the selection and use of the surfactant also have an important influence on the touch of the final product.

[0090] Although a cationic surfactant was added in Comparative Example 1-2, compared with non-ionic surfactants, its molecular structure and affinity characteristics were poor, and the chain segment lubricating effect inside the adhesive layer was limited. The hand feeling score was better than that of the sample without surfactant, but still could not achieve the soft and smooth effect of Example 2. This further illustrates that in the design of the formula, the synergistic mechanism of hydra acetic acid cross-linking and non-ionic surfactant can not only ensure the network strength of the adhesive layer, but also effectively regulate its flexibility and interface touch, meeting the combined requirements of comfort and practicality for flocked products.

[0091] Although embodiments of the present application have been shown and described, it will be understood by those having ordinary skill in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. Three-dimensional texture special effect long fiber imitation lambskin single-sided printed products, characterized by: include: Polyester long fiber base material; A cross-linked adhesive layer coated on one side of the polyester long fiber substrate; Staple fiber fluff electrostatically embedded in the cross-linked adhesive layer; The cross-linked adhesive layer is composed of the following components in parts by mass: 90-100 parts of polyvinyl butyral; 350–450 parts of benzaldehyde or p-anisaldehyde; 180–220 parts of hydrazoacetic acid; 1–3 parts nonionic surfactant.

2. The three-dimensional texture special effect long fiber imitation lambskin single-sided printed product according to claim 1, characterized in that: The polyester long fiber substrate is a sherpa fabric with a gram weight of 220-320 g / m², and the short fiber pile is nylon 6 or nylon 66 short fiber with a length of 0.8-1.4 mm.

3. A method for preparing a three-dimensional textured special-effect long-fiber sherpa-like single-sided printed product, the three-dimensional textured special-effect long-fiber sherpa-like single-sided printed product according to any one of claims 1-2, characterized in that: The following steps are involved: S1. Prepare the glue solution by adding polyvinyl butyral, benzaldehyde or p-anisaldehyde, hydrazone acetic acid, and a nonionic surfactant to a mixed solvent of ethanol and water and mixing well; S2. The resulting adhesive is applied to one side of the polyester long fiber substrate; S3. Drying the coated substrate; S4. Perform electrostatic flocking on the surface of the adhesive layer; S5. After flocking is completed, heat treatment is performed; S6. Steam fixation treatment of the material; S7. Complete the washing and drying steps to obtain the finished product.

4. The method for preparing a three-dimensional texture special-effect long-fiber sherpa-like single-sided printed product according to claim 3, characterized in that: S1 formulation includes: Adding polyvinyl butyral, benzaldehyde or p-anisaldehyde, hydrazoacetic acid and nonionic surfactant into the solvent system in proportion; The solvent system is a mixture of ethanol and water, where the volume ratio of ethanol to water is 3:1; After adding, stir the mixture at 600-800 rpm for 20-30 minutes to obtain a glue solution.

5. The method for preparing a three-dimensional texture special effect long-fiber sherpa-like single-sided printed product according to claim 3, characterized in that: S2 coating is carried out by a blade coater, and the parameters of the blade coater are: The scraper thickness is 0.2–0.4 mm, the glue application rate is 10–15 m / min, and the glue application amount per unit area is controlled at 30–40 g / m²; The coated substrate is initially dried in a hot air drying device with the temperature set at 40–50°C for 3–5 minutes.

6. The method for preparing a three-dimensional texture special-effect long-fiber sherpa-like single-sided printed product according to claim 3, characterized in that: S3 Drying includes: The coated substrate is placed in a drying chamber where the temperature is controlled at 40–50°C for 3–5 minutes and the drying air flow rate is 0.5–1.0 m / s.

7. The method for preparing a three-dimensional textured special-effect long-fiber sherpa-like single-sided printed product according to claim 3, characterized in that: In S4, an electrostatic flocking machine is used, the flocking voltage is 20–25 kV, the humidity in the flocking area is 50–65%, and the flocking time is 3–5 minutes.

8. The method for preparing a three-dimensional textured special-effect long-fiber sherpa-like single-sided printed product according to claim 3, characterized in that: The heat treatment step in S5 is performed in a hot air circulation oven with the temperature controlled at 70–90°C and the treatment time being 8–12 minutes.

9. The method for preparing a three-dimensional textured special-effect long-fiber sherpa-like single-sided printed product according to claim 3, characterized in that: In S6, a steam tunnel is used, the steam temperature is controlled at 100°C, the steam pressure is 0.2–0.3 MPa, and the processing time is 10–15 minutes.

10. The method for preparing a three-dimensional texture special-effect long-fiber sherpa-like single-sided printed product according to claim 3, characterized in that: S7 uses a spray-type washing machine with a washing temperature of 30–40°C and a washing time of no more than 3 minutes; a drum dryer is used for drying with a temperature controlled at 90–100°C and a drying time of 5–10 minutes.

Images