Production process of dyeable Yangbuck microfiber synthetic leather

Abstract

The invention provides a production process of dyeable Yangbuck microfiber synthetic leather, which is characterized in that microfiber bass is subjected to five steps of bottom sealing material treatment, dyeable Yangbuck treatment agent treatment, primary impregnation machine foaming treatment, dyeing treatment and secondary impregnation machine drying treatment, and the prepared microfiber synthetic leather is comfortable in hand feeling, high in color fastness and high in quality. After Yangbuck foaming dyeing, the surface style forms partial permeation and then has a natural tie-dyeing style, the hand feeling is comfortable, the plush feeling is strong, the appearance of leather ornaments can be richer designed, the use method of traditional artificial leather in the current market can be improved, and the artificial leather can better adapt to the beautiful life of human beings.

Description

Technical Field

[0001] The present invention relates to the technical field of synthetic leather, and particularly relates to a production process of a dyeable sheepskin-like ultra-fine synthetic leather.

Background Art

[0002] In recent years, with the continuous update of the surface materials of synthetic leather, people have higher and higher requirements for the high-grade appearance of leather ornaments, the comfortable feeling of touch, and the durability of use. Along with the new applications of new materials and new post-treatment processes, the grades and types of artificial synthetic leather products have developed rapidly. Due to the continuous development of science and technology, the indicators such as the strength, wear resistance, hygroscopicity, and genuine leather feeling of artificial synthetic leather products have been greatly improved compared with before. The continuous improvement of performance has enabled people to gradually accept this alternative material to natural leather and form a huge application market. However, traditional synthetic leather has several deficiencies, such as a single and monotonous appearance, a rough hand feeling and lack of genuine leather feeling, a complex dyeing process, and poor color water stability. Therefore, it cannot meet most of people's requirements for the appearance of leather ornaments.

[0003] In view of this, the inventor of this case has conducted in-depth research on the above problems, and thus this case has been created.

Summary of the Invention

[0004] The present invention aims to solve the technical problems existing in traditional synthetic leather in the prior art, and provides a production process of a dyeable sheepskin-like ultra-fine synthetic leather. The produced ultra-fine synthetic leather realizes rich appearance designs through a dyeable process, and the natural tie-dye effect improves the aesthetics and solves the problem of monotonous styles. Through five treatment steps, the bottom coating improves the softness and flatness, and the sheepskin-like resin forms a soft fluff feeling. The product has uniform dyeing penetration and excellent color water stability. It has a comfortable hand feeling and a strong fluff feeling, can realize more abundant designs for the appearance of leather ornaments, and can improve the usage method of traditional artificial leather in the current market, and can better meet people's yearning for a better life.

[0005] The present invention is realized as follows: A production process of a dyeable sheepskin-like ultra-fine synthetic leather, comprising the following steps:

[0006] Step 1: Bottom coating treatment. Uniformly mix 80 - 120 parts of one-component bottom coating resin, 80 - 100 parts of DMF, 10 - 30 parts of MEK, and 8 - 10 parts of color paste to prepare a bottom coating; select ultra-fine base fabric, and scrape the bottom coating on the ultra-fine base fabric.

[0007] Step 2: Treatment with a dyeable sheepskin-like treatment agent. Uniformly mix 80 - 120 parts of a dyeable sheepskin-like resin, 30 - 50 parts of MEK, and 0 - 5 parts of color paste to prepare a dyeable sheepskin-like treatment agent; scrape the dyeable sheepskin-like treatment agent on the ultra-fine base fabric coated with the bottom coating.

[0008] Step 3: Foaming treatment with a single impregnating machine. The microfiber base fabric coated with the stainable nappa leather treatment agent is foamed through the impregnating machine;

[0009] Step 4: Dyeing treatment. Prepare a dyeing agent by mixing 100 parts of water, 3 - 8 parts of color paste, and 1 - 3 parts of penetrant, and perform dyeing treatment on the microfiber base fabric foamed on the impregnating machine.

[0010] Step 5: Drying treatment with a double impregnating machine. The dyed microfiber base fabric is dried on the impregnating machine to obtain the finished product of stainable nappa leather microfiber synthetic leather.

[0011] Furthermore, in Step 1, the solid content of the one - component base resin is 45%, and the modulus is 10 - 25 Kg / cm 2 。

[0012] Furthermore, in Step 1, the viscosity of the sealing base material is controlled at 1000 - 1500 cps.

[0013] Furthermore, in Step 1, select the microfiber base fabric after fine grinding. The microfiber base fabric is a high - hydrolysis - resistant microfiber base fabric with a specification of 1.15 - 1.35 mm, which is finely ground with 240 - mesh fine sandpaper before use; The microfiber base fabric is treated with the sealing base material by a three - plate processor using 80 + 100 - mesh wheels, and the coating amount is 60 - 80 g / m 2 ,and the drying temperature is 140 - 160 °C, and the drying time is 2 - 3 min.

[0014] Furthermore, in Step 2, the viscosity of the stainable nappa leather treatment agent is controlled at 1000 - 1500 cps.

[0015] Furthermore, in Step 2, the microfiber base fabric coated with the sealing base material is treated with the stainable nappa leather treatment agent by a three - plate processor using 60 + 80 - mesh wheels, and the coating amount is 70 - 90 g / m 2 ,and the drying temperature is 100 - 120 °C, and the drying time is 2 - 3 min.

[0016] Furthermore, in Step 3, during the foaming treatment with a single impregnating machine, the temperature of the impregnating machine is 170 - 180 °C, the vehicle speed is 15 m / min, and the foaming duration is 80 - 100 s.

[0017] Furthermore, in Step 4, the dyeing temperature is 90 - 95 °C, and the dyeing time is 30 - 50 min.

[0018] Furthermore, in Step 5, the drying temperature of the double impregnating machine is 140 - 160 °C, the vehicle speed is 8 - 10 m / min, and the drying duration is 2 - 3 min.

[0019] The advantages of the present invention are:

[0020] 1. The microfiber synthetic leather achieves rich appearance designs through a dyeable process. The natural tie-dye effect enhances the aesthetics and solves the problem of monotonous styles. Through the coordination of five treatment steps, namely, the treatment of the base material, the treatment with a dyeable sheepskin treatment agent, the foaming treatment with a primary impregnation machine, the dyeing treatment, and the drying treatment with a secondary impregnation machine, the base material enhances the softness and flatness, and the sheepskin resin forms a soft fluffy feeling. The dyeable sheepskin microfiber synthetic leather has uniform dyeing penetration, excellent color water stability, a comfortable hand feel, and a strong fluffy feeling. It can achieve a more diverse design of leather accessories and improve the usage method of traditional artificial leather in the current market, making it easier to meet the needs of consumers.

[0021] 2. The dyeable sheepskin microfiber synthetic leather makes full use of the dyeable characteristics of sheepskin. The microfiber synthetic leather produced with a dyeable sheepskin treatment agent has a soft and comfortable hand feel, a strong fluffy feeling, and a natural fluffy feeling style on the surface, with a natural tie-dye effect in color.

[0022] 3. This production process is beneficial to color water stability and is simple and easy to operate.

Specific Embodiment

[0023] To better understand the technical solution of the present invention, the technical solution of the present invention will be described in detail below with specific embodiments.

[0024] The present invention provides a production process for dyeable sheepskin microfiber synthetic leather, including the following steps:

[0025] Step 1: Treatment of the base material. Uniformly mix 80 - 120 parts of one-component base material resin, 80 - 100 parts of DMF, 10 - 30 parts of MEK, and 8 - 10 parts of color paste to prepare the base material; select microfiber base fabric and scrape the base material on the microfiber base fabric.

[0026] Step 2: Treatment with a dyeable sheepskin treatment agent. Uniformly mix 80 - 120 parts of dyeable sheepskin resin, 30 - 50 parts of MEK, and 0 - 5 parts of color paste to prepare the dyeable sheepskin treatment agent; scrape the dyeable sheepskin treatment agent on the microfiber base fabric coated with the base material; the dyeable sheepskin resin is characterized by easy dyeing, a soft and comfortable hand feel after foaming, a strong fluffy feeling, and a natural fluffy feeling style on the surface, with a natural tie-dye effect in color.

[0027] Step 3: Foaming treatment with a primary impregnation machine. Foam the microfiber base fabric scraped with the dyeable sheepskin treatment agent through an impregnation machine.

[0028] Step 4: Dyeing treatment. Prepare a dyeing agent by mixing 100 parts of water, 3 - 8 parts of color paste, and 1 - 3 parts of penetrant, and perform dyeing treatment on the microfiber base fabric foamed on the impregnation machine.

[0029] Step 5: Drying treatment in the secondary impregnating machine. After drying the dyed ultra-fine fiber bass in the impregnating machine, the finished product of the dyeable sheep nappa ultra-fine fiber synthetic leather is obtained.

[0030] The production process of the dyeable sheep nappa ultra-fine fiber synthetic leather of the present invention has the following beneficial technical effects:

[0031] 1. The ultra-fine fiber synthetic leather realizes rich appearance designs through the dyeable process. The natural tie-dye effect improves the aesthetics and solves the problem of monotonous styles. Through the coordination of five treatment steps: primer treatment, treatment with a dyeable sheep nappa treatment agent, foaming treatment in the primary impregnating machine, dyeing treatment, and drying treatment in the secondary impregnating machine, the primer improves softness and flatness, and the sheep nappa resin forms a soft fluff feeling. The dyeable sheep nappa ultra-fine fiber synthetic leather has uniform dyeing penetration, excellent color water stability, comfortable hand feeling, and strong fluff feeling, enabling more abundant designs for the appearance of leather accessories and improving the usage methods of traditional artificial leathers in the current market, thus making it easier to meet the needs of consumers.

[0032] 2. The dyeable sheep nappa ultra-fine fiber synthetic leather makes full use of the dyeable characteristics of sheep nappa. The ultra-fine fiber synthetic leather produced with the dyeable sheep nappa treatment agent has a soft and comfortable hand feeling, a strong fluff feeling, and a natural fluff feeling style on the surface, and the color has a natural tie-dye effect.

[0033] 3. This production process is beneficial to color water stability, and the process is simple and easy to operate.

[0034] Preferably, in step 1, the solid content of the one-component primer resin is 45%, and the modulus is 10 - 25 Kg / cm 2 . This one-component primer resin is a low-modulus and high-solid-content primer resin, which forms a dense bottom layer on the ultra-fine fiber bass, can improve the flatness of the ultra-fine fiber bass and the adhesion of the coating; furthermore, it can improve the softness and flatness of the finished product of the dyeable sheep nappa ultra-fine fiber synthetic leather, making the overall surface of the dyeable sheep nappa ultra-fine fiber synthetic leather have a perfect appearance and a comfortable hand feeling, and having characteristics such as excellent processability, good leveling property, soft hand feeling, strong hydrolysis resistance, and good flexural resistance.

[0035] Preferably, in step 1, the viscosity of the primer is controlled at 1000 - 1500 cps to ensure the uniformity of the primer treatment.

[0036] Preferably, select the superfine fiber bass warp after fine grinding. The superfine fiber bass warp is a high hydrolysis-resistant superfine fiber bass with a specification of 1.15 - 1.35 mm that has been finely ground with 240-mesh fine sandpaper before use. This superfine fiber bass has the characteristics of a hydrolysis-resistant peel strength of 110 N / 3 cm before hydrolysis, a peel strength of 80 N / 3 cm after 24 hours of hydrolysis (soaked in 10% NaOH), a soft handfeel, a softness between 2.8 - 3.6 / 0.1 mm, a high trouser-shaped tear strength, a warp tensile strength of ≥400, a weft tensile strength of ≥400, and a bursting strength of 20 kgf / cm2. After fine grinding, the surface of the product can be made flat and the thickness more uniform. The superfine fiber bass warp is treated with an 80 + 100-mesh wheel on a three-plate processor for the bottom coating material, and the coating amount is 60 - 80 g / m 2 , and the drying temperature is 140 - 160 °C, and the drying time is 2 - 3 min.

[0037] Preferably, in step 2, the viscosity of the dyeable sheepskin treatment agent is controlled at 1000 - 1500 cps.

[0038] Preferably, in step 2, the dyeable sheepskin resin is made by mixing a base resin, a functional additive, and a solvent. The base resin is a polyurethane resin formed by the reaction of polytetrahydrofuran diol and isophorone diisocyanate, providing flexibility and film-forming properties; the functional additives are a foaming agent, fine sheepskin powder, wax powder, and a cross-linking agent, ethylenediaminoethanesulfonic acid sodium; the solvent is a TOL / MEK mixed solvent, accounting for about 79%, and the solid content is 21 ± 2%. Preferably, the dyeable sheepskin resin is the 886 - 2 cold-resistant water-rubbed fine sheepskin resin produced by Zhejiang Luoxing Chemical Co., Ltd., and the viscosity is 2500 - 3500 mPa·s (25 °C).

[0039] Preferably, in step 2, the superfine fiber bass coated with the bottom coating material is treated with a 60 + 80-mesh wheel on a three-plate processor for the dyeable sheepskin treatment agent, and the coating amount is 70 - 90 g / m 2 , and the drying temperature is 100 - 120 °C, and the drying time is 2 - 3 min. The treatment with a 60 + 80-mesh wheel forms a micron-level surface texture, enhancing the subsequent foaming effect.

[0040] Preferably, in step 3, during the foaming treatment in the primary impregnating machine, the temperature of the impregnating machine is 170 - 180 °C, the vehicle speed is 15 m / min, and the impregnating and foaming duration is 80 - 100 s. The high temperature of 170 - 180 °C activates the foaming activity of the resin to form a three-dimensional porous structure; the vehicle speed of 15 m / min balances the production efficiency and the foaming quality; accurately controlling the foaming duration (80 - 100 s) achieves a porosity of 40 - 60%.

[0041] Preferably, in step 4, the penetrant is a penetrant composed of a fatty alcohol ethoxylate and an alcohol ether produced by Henglong Chemical Industry, which is an anionic-nonionic type. The penetrant optimizes the diffusion of the dyeing agent in the foaming layer. As another embodiment, the penetrant can also be a fatty alcohol polyoxyethylene ether.

[0042] Preferably, in step 4, the dyeing temperature is 90 - 95 °C and the dyeing time is 30 - 50 min. The critical temperature control of 90 - 95 °C ensures that the dye molecules fully penetrate without damaging the fibers.

[0043] Preferably, in step 5, the drying temperature of the secondary impregnating machine is 140 - 160 °C, the vehicle speed is 8 - 10 m / min, and the drying duration is 2 - 3 min.

[0044] The beneficial effects of the synthetic leather prepared by the production process of the dyeable sheep nappa superfine fiber synthetic leather according to this embodiment are further illustrated through several sets of examples and comparative examples below.

[0045] Example 1

[0046] A production process of a dyeable sheep nappa superfine fiber synthetic leather (specific process flow: bass fine grinding → treatment of the sealing base material → treatment of the dyeable sheep nappa treatment agent → impregnating machine foaming → dyeing → impregnating machine drying → finished product), specifically including the following steps:

[0047] Step 1: Treatment of the sealing base material. 100 parts of one-component base resin, 90 parts of DMF, 20 parts of MEK, and 9 parts of color paste are evenly mixed to prepare the sealing base material; the viscosity of the sealing base material is controlled at 1000 - 1500 cps. Select the superfine fiber bass after fine grinding. The superfine fiber bass is a high hydrolysis-resistant superfine fiber bass with a specification of 1.25 mm that has been finely ground with 240-mesh fine sandpaper before use; the superfine fiber bass is treated with the sealing base material by a three-plate processor using 80 + 100-mesh wheels, and the coating amount is 70 g / m 2 , the drying temperature is 150 °C, and the drying time is 3 min. The sealing base material is scraped and coated on the superfine fiber bass; the solid content of the one-component base resin is 45% and the modulus is 20 Kg / cm 2 .

[0048] Step 2: Treatment of the dyeable sheep nappa treatment agent. 100 parts of dyeable sheep nappa resin, 40 parts of MEK, and 3 parts of color paste are evenly mixed to prepare the dyeable sheep nappa treatment agent, and the viscosity of the dyeable sheep nappa treatment agent is controlled at 1000 - 1500 cps; the superfine fiber bass coated with the sealing base material is treated with the dyeable sheep nappa treatment agent by a three-plate processor using 60 + 80-mesh wheels, and the coating amount is 80 g / m 2 , the drying temperature is 120 °C, and the drying time is 3 min.

[0049] Step 3: Foaming treatment with a single impregnation machine. The microfiber base fabric coated with the stainable sheepskin treatment agent is foamed through the impregnation machine. The temperature of the impregnation machine is 180°C, the vehicle speed is 15 m / min, and the foaming duration is 90 s.

[0050] Step 4: Dyeing treatment. Prepare a dyeing agent by mixing 100 parts of water, 5 parts of color paste, and 2 parts of penetrant, and conduct dyeing treatment on the impregnated microfiber base fabric. The dyeing temperature is 90 - 95°C, and the dyeing time is 40 min. The penetrant is a penetrant composed of a fatty alcohol ethoxylate compound and an alcohol ether produced by Henglong Chemical Industry.

[0051] Step 5: Drying treatment with a secondary impregnation machine. Dry the dyed microfiber base fabric on the impregnation machine. The drying temperature of the impregnation machine is 150°C, the vehicle speed is 10 m / min, and the drying duration is 3 min to obtain the finished product of stainable sheepskin microfiber synthetic leather.

[0052] The obtained stainable sheepskin microfiber synthetic leather has a comfortable hand feeling, a strong fluffiness, and a unique natural tie-dye style on the surface.

[0053] Example 2

[0054] A production process for stainable sheepskin microfiber synthetic leather (specific process flow: base fabric fine grinding → treatment of sealing base material → treatment of stainable sheepskin treatment agent → foaming with impregnation machine → dyeing → drying with impregnation machine → finished product), specifically including the following steps:

[0055] Step 1: Treatment of sealing base material. Uniformly mix 120 parts of one-component base resin, 100 parts of DMF, 30 parts of MEK, and 10 parts of color paste to prepare the sealing base material. The viscosity of the sealing base material is controlled at 1000 - 1500 cps. Select the fine-ground microfiber base fabric. The microfiber base fabric is a high hydrolysis-resistant microfiber base fabric with a specification of 1.25 mm that has been finely ground with 240-mesh fine sandpaper before use. The microfiber base fabric is treated with the sealing base material by a three-roller coater using 80 + 100-mesh wheels, and the coating amount is 70 g / m 2 , the drying temperature is 150°C, and the drying time is 3 min. Scrape the sealing base material onto the microfiber base fabric. The solid content of the one-component base resin is 45%, and the modulus is 20 Kg / cm 2 .

[0056] Step 2: Treatment of stainable sheepskin treatment agent. Uniformly mix 120 parts of stainable sheepskin resin, 50 parts of MEK, and 5 parts of color paste to prepare the stainable sheepskin treatment agent. The viscosity of the stainable sheepskin treatment agent is controlled at 1000 - 1500 cps. Treat the microfiber base fabric coated with the sealing base material with the stainable sheepskin treatment agent by a three-roller coater using 60 + 80-mesh wheels, and the coating amount is 80 g / m 2 , the drying temperature is 120°C, and the drying time is 3 min.

[0057] Step 3: Primary impregnation and foaming treatment. The microfiber base fabric coated with the stainable nappa leather treatment agent is foamed in an impregnator. The temperature of the impregnator is 180°C, the vehicle speed is 15 m / min, and the impregnation and foaming duration is 90 s.

[0058] Step 4: Dyeing treatment. Prepare a dyeing agent by mixing 100 parts of water, 8 parts of color paste, and 3 parts of penetrant, and perform dyeing treatment on the impregnated microfiber base fabric. The dyeing temperature is 90 - 95°C, and the dyeing time is 40 min. The penetrant is a penetrant composed of a fatty alcohol ethoxylate and an alcohol ether produced by Henglong Chemical Industry.

[0059] Step 5: Secondary impregnator drying treatment. Dry the dyed microfiber base fabric on the impregnator. The drying temperature of the impregnator is 150°C, the vehicle speed is 10 m / min, and the drying duration is 3 min to obtain the finished product of stainable nappa leather microfiber synthetic leather.

[0060] The obtained stainable nappa leather microfiber synthetic leather has a comfortable hand feeling, a strong fluffiness, and a unique natural tie-dye style on the surface.

[0061] Example 3

[0062] A production process for stainable nappa leather microfiber synthetic leather (specific process flow: base fabric fine grinding → treatment of sealing primer → treatment of stainable nappa leather treatment agent → impregnator foaming → dyeing → impregnator drying → finished product), specifically including the following steps:

[0063] Step 1: Sealing primer treatment. Prepare a sealing primer by uniformly mixing 80 parts of one-component primer resin, 80 parts of DMF, 10 parts of MEK, and 8 parts of color paste. The viscosity of the sealing primer is controlled at 1000 - 1500 cps. Select the fine-ground microfiber base fabric. The microfiber base fabric is a high hydrolysis-resistant microfiber base fabric with a specification of 1.25 mm that has been fine-ground with 240-mesh fine sandpaper before use. The microfiber base fabric is treated with the sealing primer using an 80 + 100-mesh wheel on a three-roll coater, and the coating amount is 70 g / m 2 , the drying temperature is 150°C, and the drying time is 3 min. Scrape the sealing primer onto the microfiber base fabric. The solid content of the one-component primer resin is 45%, and the modulus is 20 Kg / cm 2 .

[0064] Step 2: Stainable nappa leather treatment agent treatment. Prepare a stainable nappa leather treatment agent by uniformly mixing 80 parts of stainable nappa leather resin and 30 parts of MEK. The viscosity of the stainable nappa leather treatment agent is controlled at 1000 - 1500 cps. Treat the microfiber base fabric coated with the sealing primer with the stainable nappa leather treatment agent using a 60 + 80-mesh wheel on a three-roll coater, and the coating amount is 80 g / m 2 , the drying temperature is 120°C, and the drying time is 3 min.

[0065] Step 3: Foaming treatment with a single impregnation machine. The microfiber base coated with the stainable sheepskin treatment agent is foamed through the impregnation machine. The temperature of the impregnation machine is 180°C, the vehicle speed is 15 m / min, and the foaming duration of the impregnation machine is 90 s.

[0066] Step 4: Dyeing treatment. Prepare a dyeing agent by mixing 100 parts of water, 3 parts of color paste, and 1 part of penetrant. Perform dyeing treatment on the impregnated microfiber base. The dyeing temperature is 90 - 95°C, and the dyeing time is 40 min. The penetrant used is a penetrant composed of a fatty alcohol ethoxylate compound and an alcohol ether produced by Henglong Chemical Industry.

[0067] Step 5: Drying treatment with a secondary impregnation machine. Dry the dyed microfiber base on the impregnation machine. The drying temperature of the impregnation machine is 150°C, the vehicle speed is 10 m / min, and the drying duration is 3 min to obtain the finished product of stainable sheepskin microfiber synthetic leather.

[0068] The obtained stainable sheepskin microfiber synthetic leather has a comfortable hand feeling, a strong fluffiness, and a unique natural tie-dye style on the surface.

[0069] Comparative Example 1

[0070] A production process for stainable sheepskin microfiber synthetic leather (specific process flow: base fine grinding → treatment with stainable sheepskin treatment agent → foaming with impregnation machine → dyeing → drying with impregnation machine → finished product), specifically including the following steps:

[0071] Step 1: Select the microfiber base after fine grinding. The microfiber base is a high hydrolysis-resistant microfiber base with a specification of 1.25 mm that has been finely ground with 240-mesh fine sandpaper before use.

[0072] Step 2: Treatment with stainable sheepskin treatment agent. Uniformly mix 100 parts of stainable sheepskin resin, 40 parts of MEK, and 3 parts of color paste to prepare a stainable sheepskin treatment agent. The viscosity of the stainable sheepskin treatment agent is controlled at 1000 - 1500 cps. Treat the microfiber base coated with the sealing primer with the stainable sheepskin treatment agent using a 60 + 80-mesh wheel on a three-plate processor, and the coating amount is 80 g / m 2 , the drying temperature is 120°C, and the drying time is 3 min.

[0073] Step 3: Foaming treatment with a single impregnation machine. The microfiber base coated with the stainable sheepskin treatment agent is foamed through the impregnation machine. The temperature of the impregnation machine is 180°C, the vehicle speed is 15 m / min, and the foaming duration of the impregnation machine is 90 s.

[0074] Step 4: Dyeing treatment. Prepare a dyeing agent by mixing 100 parts of water, 5 parts of color paste, and 2 parts of penetrant. Perform dyeing treatment on the microfiber base after foaming with the impregnation machine. The dyeing temperature is 90 - 95°C, and the dyeing time is 40 min. The penetrant used is a penetrant composed of a fatty alcohol ethoxylate compound and an alcohol ether produced by Henglong Chemical Industry.

[0075] Step 5: Drying treatment in the secondary impregnating machine. The dyed ultra-fine fiber bass is dried on the impregnating machine. The drying temperature of the impregnating machine is 150°C, the vehicle speed is 10 m / min, and the drying duration is 3 min to obtain the finished product of the dyeable sheep nappa ultra-fine fiber synthetic leather.

[0076] After performance index testing, the light fastness of the finished product of the dyeable sheep nappa ultra-fine fiber synthetic leather is 4 - 5 levels, elongation at break: 143% in the weft direction and 82% in the warp direction, tensile load: 700 N in the warp direction and 568 N in the weft direction, tear load: 112 N in the warp direction and 103 N in the weft direction, folding resistance performance: no rupture after 100,000 times of PU dry method at normal temperature, no rupture after 40,000 times of PU dry method at low temperature of -15°C, rupture strength > 30 kgf / cm 2 (The material is not broken), Taber abrasion resistance: Since the sheep nappa material has a velvet-like effect, the surface is not tested for abrasion resistance. Peel load: Due to the velvet-like effect on the surface of the sheep nappa material, the surface needs to be polished when testing the peel. After polishing, the conventional peel is tested; 122 N / 3CM, the peel load after hydrolysis resistance is 116 N / 3CM. Due to no primer treatment, the surface effect is uneven, the hand feeling is rough, and the apparent natural antique style has uneven surface dyeing and poor velvet feeling compared with Example 1. The above physical properties meet the product design requirements but the appearance does not meet the requirements.

[0077] Comparative Example 2

[0078] A production process of a dyeable sheep nappa ultra-fine fiber synthetic leather (specific process flow: bass fine grinding → treatment of the sealing base material → treatment of the dyeable sheep nappa treatment agent → impregnating machine foaming → dyeing → impregnating machine drying → finished product), specifically including the following steps:

[0079] Step 1: Treatment of the sealing base material. 100 parts of one-component base resin, 90 parts of DMF, 20 parts of MEK, and 9 parts of color paste are evenly mixed to prepare the sealing base material; the viscosity of the sealing base material is controlled at 1000 - 1500 cps. Select the fine-ground ultra-fine fiber bass. The ultra-fine fiber bass is a high hydrolysis-resistant ultra-fine fiber bass with a specification of 1.25 mm that has been fine-ground with 240-mesh fine sandpaper before use; the ultra-fine fiber bass is treated with the sealing base material using an 80 + 100-mesh wheel on a three-plate processor, and the coating amount is 70 g / m 2 , the drying temperature is 150°C, and the drying time is 3 min. The sealing base material is scrape-coated on the ultra-fine fiber bass; the solid content of the one-component base resin is 45% and the modulus is 20 Kg / cm 2 .

[0080] Step 2: Treatment with the dyeable sheepskin-like treatment agent. Mix 100 parts of dyeable sheepskin-like resin, 40 parts of MEK, and 3 parts of color paste evenly to prepare the dyeable sheepskin-like treatment agent, and control the viscosity of the dyeable sheepskin-like treatment agent at 1000 - 1500 cps. Treat the microfiber base coated with the sealing primer with the dyeable sheepskin-like treatment agent using a 60 + 80 mesh wheel on a three-plate processor, and the coating amount is 80 g / m 2 , the drying temperature is 120 °C, and the drying time is 3 min.

[0081] Step 3: Foaming treatment with a primary impregnating machine. Treat the microfiber base coated with the dyeable sheepskin-like treatment agent through the impregnating machine for foaming treatment. The temperature of the impregnating machine is 180 °C, the vehicle speed is 15 m / min, and the foaming duration of the impregnating machine is 90 s.

[0082] Step 4: Dyeing treatment. Prepare a dyeing agent by mixing 100 parts of water, 5 parts of color paste, and 2 parts of penetrant, and conduct dyeing treatment on the impregnated microfiber base; the dyeing temperature is 70 - 80 °C, and the dyeing time is 40 min. The penetrant is a penetrant composed of a fatty alcohol ethoxylate and an alcohol ether produced by Henglong Chemical Industry.

[0083] Step 5: Drying treatment with a secondary impregnating machine. Dry the dyed microfiber base on the impregnating machine. The drying temperature of the impregnating machine is 150 °C, the vehicle speed is 10 m / min, and the drying duration is 3 min to obtain the finished product of dyeable sheepskin-like microfiber synthetic leather.

[0084] After performance index testing, the light fastness of the finished product of the dyeable sheepskin-like microfiber synthetic leather is 4 - 5 levels, elongation at break: 152% in the weft direction, 85% in the warp direction, tensile load: 711 N in the warp direction, 588 N in the weft direction, tear load: 119 N in the warp direction, 105 N in the weft direction, flex resistance performance: no rupture after 100,000 times of PU dry method at normal temperature, no rupture after 40,000 times of PU dry method at low temperature of -15 °C, rupture strength > 30 kgf / cm 2 (The material is not broken), Taber abrasion resistance: Since the sheepskin-like material has a velvet-like effect, the surface is not tested for abrasion resistance. Peel load: Due to the velvet-like effect on the surface of the sheepskin-like material, the surface needs to be polished when testing peeling, and the conventional peeling is tested after polishing; 128 N / 3CM, peel load after hydrolysis resistance is 115 N / 3CM. This finished product has a comfortable hand feeling, strong fluffiness, and a unique natural tie-dye style on the appearance. However, due to the relatively low dyeing temperature, the core turns white after cutting the edge, and the dyeing effect penetrates unevenly, not meeting the design requirements.

[0085] Comparative Example 3

[0086] A production process for dyeable sheepskin-like microfiber synthetic leather (specific process flow: bass fine grinding → treatment with sealing primer → treatment with dyeable sheepskin-like treatment agent → impregnating machine foaming → dyeing → impregnating machine drying → finished product), specifically including the following steps:

[0087] Step 1: Treatment of the sealing base material. Mix 100 parts of one-component base resin, 90 parts of DMF, 20 parts of MEK, and 9 parts of color paste evenly to prepare the sealing base material; control the viscosity of the sealing base material at 1000 - 1500 cps. Select the superfine fiber bass warp after fine grinding. The superfine fiber bass warp is a high hydrolysis-resistant superfine fiber bass with a specification of 1.25 mm that has been finely ground with 240-mesh fine sandpaper before use. Process the sealing base material on a three-roll coater with 80 + 100-mesh wheels, and the coating amount is 70 g / m 2 , the drying temperature is 150 °C, and the drying time is 3 min. Scrape and coat the sealing base material on the superfine fiber bass; the solid content of the one-component base resin is 45%, and the modulus is 20 Kg / cm 2 .

[0088] Step 2: Treatment with the dyeable nappa leather treatment agent. Mix 100 parts of dyeable nappa leather resin, 40 parts of MEK, and 3 parts of color paste evenly to prepare the dyeable nappa leather treatment agent, and control the viscosity of the dyeable nappa leather treatment agent at 1000 - 1500 cps; process the superfine fiber bass coated with the sealing base material on a three-roll coater with 60 + 80-mesh wheels for the dyeable nappa leather treatment agent, and the coating amount is 80 g / m 2 , the drying temperature is 120 °C, and the drying time is 3 min.

[0089] Step 3: Foaming treatment on the first impregnating machine. Process the superfine fiber bass coated with the dyeable nappa leather treatment agent on the impregnating machine for foaming treatment. The temperature of the impregnating machine is 180 °C, the vehicle speed is 15 m / min, and the foaming time on the impregnating machine is 90 s.

[0090] Step 4: Dyeing treatment. Mix 100 parts of water, 5 parts of color paste, and 2 parts of penetrant to prepare the dyeing agent, and conduct dyeing treatment on the impregnated superfine fiber bass; the dyeing temperature is 110 - 120 °C, and the dyeing time is 40 min. The penetrant is a penetrant composed of a fatty alcohol ethoxylate and an alcohol ether produced by Henglong Chemical Industry.

[0091] Step 5: Drying treatment on the second impregnating machine. Dry the dyed superfine fiber bass on the impregnating machine. The drying temperature of the impregnating machine is 150 °C, the vehicle speed is 10 m / min, and the drying time is 3 min to obtain the finished product of dyeable nappa leather superfine fiber synthetic leather.

[0092] After performance index testing, the light fastness of the finished product of the dyeable nappa leather superfine fiber synthetic leather is 4 - 5 levels, the elongation at break: 98% in the weft direction, 55% in the warp direction, the tensile load: 300 N in the warp direction, 255 N in the weft direction, the tear load: 69 N in the warp direction, 54 N in the weft direction, the folding resistance performance: no rupture after 100,000 times of PU dry method at normal temperature, no rupture after 40,000 times of PU dry method at low temperature of -15 °C, and the rupture strength > 30 kgf / cm 2(Material breakage), Taber abrasion resistance: Since the nubuck material has a velvety effect, the surface is not tested for abrasion resistance. Peel load: Due to the velvety effect on the surface of the nubuck material, the surface needs to be polished before testing the peel. After polishing, the conventional peel is tested; 62N / 3CM, and the peel load after hydrolysis resistance is 45N / 3CM. This finished product has a comfortable hand feel, a strong fluffiness, a unique natural tie-dye style on the surface, and the effect is OK. However, due to the high dyeing temperature, the fibers of the ultra-fine fiber substrate have been damaged during dyeing, so the peel load is low. The above physical properties do not meet the product design requirements.

[0093] Comparative Example 4

[0094] A production process for dyeable nubuck ultra-fine fiber synthetic leather (specific process flow: bass fine grinding → treatment of sealing base material → treatment of dyeable nubuck treatment agent → dyeing → impregnating machine foaming → impregnating machine drying → finished product), specifically including the following steps:

[0095] Step 1: Treatment of the sealing base material. Mix 100 parts of one-component base resin, 90 parts of DMF, 20 parts of MEK, and 9 parts of color paste evenly to prepare the sealing base material; the viscosity of the sealing base material is controlled at 1000 - 1500 cps. Select the fine-ground ultra-fine fiber bass. The ultra-fine fiber bass is a high hydrolysis-resistant ultra-fine fiber bass with a specification of 1.25 mm that has been fine-ground with 240-mesh fine sandpaper before use. The ultra-fine fiber bass is treated with the sealing base material by a three-roll coater using 80 + 100-mesh wheels, and the coating amount is 70 g / m 2 , the drying temperature is 150 °C, the drying time is 3 min, and the sealing base material is scraped and coated on the ultra-fine fiber bass; the solid content of the one-component base resin is 45%, and the modulus is 20 Kg / cm 2 .

[0096] Step 2: Treatment with the dyeable nubuck treatment agent. Mix 100 parts of dyeable nubuck resin, 40 parts of MEK, and 3 parts of color paste evenly to prepare the dyeable nubuck treatment agent. The viscosity of the dyeable nubuck treatment agent is controlled at 1000 - 1500 cps; the ultra-fine fiber bass coated with the sealing base material is treated with the dyeable nubuck treatment agent by a three-roll coater using 60 + 80-mesh wheels, and the coating amount is 80 g / m 2 , the drying temperature is 120 °C, and the drying time is 3 min.

[0097] Step 3: Dyeing treatment. Mix 100 parts of water, 5 parts of color paste, and 2 parts of penetrant to prepare the dyeing agent, and perform dyeing treatment on the ultra-fine fiber bass coated with the dyeable nubuck treatment agent; the dyeing temperature is 90 - 95 °C, and the dyeing time is 40 min. The penetrant is a penetrant composed of a fatty alcohol ethoxylate and an alcohol ether produced by Henglong Chemical Industry.

[0098] Step 4: Foaming treatment on the one-time impregnating machine, foaming the dyed ultra-fine fiber bass through the impregnating machine; the temperature of the impregnating machine is 180°C, the vehicle speed is 15 m / min, and the impregnating and foaming duration is 90 s. After foaming, the finished product of the dyeable sheep nappa ultra-fine fiber synthetic leather is obtained. The foaming is high-temperature foaming and has been dried, so there is no need for secondary drying.

[0099] After performance index testing, the light fastness of the finished product of the dyeable sheep nappa ultra-fine fiber synthetic leather is 4 - 5 levels, elongation at break: 140% in the weft direction, 89% in the warp direction, tensile load: 699 N in the warp direction, 578 N in the weft direction, tear load: 113 N in the warp direction, 102 N in the weft direction, folding resistance performance: no breakage after 100,000 times of PU dry method at normal temperature, no breakage after 40,000 times of PU dry method at low temperature of -15°C, breaking strength > 30 kgf / cm 2 (The material is not broken), Taber abrasion resistance: Since the sheep nappa material has a velvet-like effect, the surface abrasion resistance is not measured. Peel load: Due to the velvet-like effect on the surface of the sheep nappa material, the surface needs to be polished when testing the peel, and the conventional peel is tested after polishing; 121 N / 3CM, the peel load after hydrolysis resistance is 112 N / 3CM. Therefore, the process is foaming first and then dyeing. This finished product has a comfortable hand feeling and a strong velvet feeling, but the appearance is grayish-white, the color is dark and not bright enough, which does not meet the design requirements.

[0100] Comparative Example 5

[0101] A production process for dyeable sheep nappa ultra-fine fiber synthetic leather (specific process flow: bass fine grinding → treatment of sealing base material → impregnating machine foaming → dyeing → impregnating machine drying → finished product), specifically including the following steps:

[0102] Step 1: Treatment of the sealing base material, uniformly mixing 100 parts of one-component base resin, 90 parts of DMF, 20 parts of MEK, and 9 parts of color paste to prepare the sealing base material; the viscosity of the sealing base material is controlled at 1000 - 1500 cps. Select the ultra-fine fiber bass after fine grinding. The ultra-fine fiber bass is a high hydrolysis-resistant ultra-fine fiber bass with a specification of 1.25 mm that has been finely ground with 240-mesh fine sandpaper before use; the ultra-fine fiber bass is treated with the sealing base material by a three-plate processing machine using 80 + 100-mesh wheels, and the coating amount is 70 g / m 2 , the drying temperature is 150°C, the drying time is 3 min, and the sealing base material is scraped and coated on the ultra-fine fiber bass; the solid content of the one-component base resin is 45%, and the modulus is 20 Kg / cm 2 .

[0103] Step 2: Foaming treatment on the one-time impregnating machine, foaming the ultra-fine fiber bass coated with the sealing base material through the impregnating machine; the temperature of the impregnating machine is 180°C, the vehicle speed is 15 m / min, and the foaming duration is 90 s.

[0104] Step 3: Dyeing treatment. Prepare a dyeing agent by mixing 100 parts of water, 5 parts of color paste, and 2 parts of penetrant, and conduct dyeing treatment on the impregnated microfiber base. The dyeing temperature is 90 - 95 °C, and the dyeing time is 40 min. The penetrant is a penetrant composed of a fatty alcohol ethoxylate and an alcohol ether produced by Henglong Chemical Industry.

[0105] Step 4: Secondary impregnation machine drying treatment. Dry the dyed microfiber base on the impregnation machine. The drying temperature of the impregnation machine is 150 °C, the vehicle speed is 10 m / min, and the drying duration is 3 min to obtain a finished product of dyeable microfiber synthetic leather.

[0106] The surface has no obvious fluffiness and presents a smooth artificial texture; the dyeing uniformity is poor, the color is gray, and there is no natural tie-dye effect; the hand feeling is hard and lacks the softness of genuine leather. Since the dyeable sheepskin treatment agent is not used, a porous structure is not formed in the foaming layer, the dyeing agent cannot penetrate to the deep layer of the fiber, and at the same time, there is a lack of fluff texture on the surface.

[0107] Table 1 Comparison table of performance parameters of synthetic leather prepared in each example and comparative example

[0108]

[0109]

[0110] Table 2 Apparent effects of synthetic leather prepared in each example and comparative example

[0111]

[0112] It can be seen from Table 1 and Table 2 that:

[0113] 1. The production process of the dyeable sheepskin microfiber synthetic leather of the present invention coordinates and cooperates through five treatment steps to ensure the performance and appearance of the microfiber synthetic leather, with a strong fluff feeling, soft and comfortable; in Comparative Example 1, there is no primer treatment, and in Comparative Example 5, there is no dyeable sheepskin treatment agent, resulting in poor coating adhesion and an uneven surface. It shows that the primer treatment is the key to improving adhesion and flatness; it shows that the dyeable sheepskin treatment agent directly affects the foaming structure and dyeing permeability.

[0114] 2. In the dyeing treatment steps of Examples 1 - 3, the critical temperature control at 90 - 95 °C realizes uniform penetration and natural tie-dye effect of the microfiber synthetic leather; low-temperature dyeing (Comparative Example 2) shows a white core; high-temperature dyeing (Comparative Example 3) destroys the fiber structure. The physical property effects of the microfiber synthetic leather in Examples 1 - 3 are good; incorrect process sequence (Comparative Example 4) or lack of key steps (Comparative Example 5) leads to a decline in physical properties. It shows that the dyeing temperature and sequence need to be strictly controlled at 90 - 95 °C and dyeing is carried out after foaming, otherwise the fiber will be damaged or the dyeing will be uneven.

[0115] Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments we described are illustrative rather than used to limit the scope of the present invention. Equivalent modifications and variations made by those skilled in the art in accordance with the spirit of the present invention should be covered by the scope protected by the claims of the present invention.

Claims

1. A production process of dyeable sheep leather-like superfine fiber synthetic leather, characterized in that: It includes the following steps: Step 1: Primer treatment. Uniformly mix 80 - 120 parts of one-component primer resin, 80 - 100 parts of DMF, 10 - 30 parts of MEK, and 8 - 10 parts of color paste to prepare the primer; select ultra-fine fiber base fabric and scrape the primer onto the ultra-fine fiber base fabric. Step 2: Dyeable nappa leather treatment agent treatment. Uniformly mix 80 - 120 parts of dyeable nappa leather resin, 30 - 50 parts of MEK, and 0 - 5 parts of color paste to prepare the dyeable nappa leather treatment agent; scrape the dyeable nappa leather treatment agent onto the ultra-fine fiber base fabric coated with the primer. Step 3: Primary impregnating machine foaming treatment. Foam the ultra-fine fiber base fabric scraped with the dyeable nappa leather treatment agent through the impregnating machine. Step 4: Dyeing treatment. Prepare a dyeing agent by mixing 100 parts of water, 3 - 8 parts of color paste, and 1 - 3 parts of penetrant, and conduct dyeing treatment on the ultra-fine fiber base fabric foamed on the impregnating machine. Step 5: Secondary impregnating machine drying treatment. Dry the dyed ultra-fine fiber base fabric in the impregnating machine to obtain the finished product of dyeable nappa leather synthetic leather.

2. The production process of the dyeable sheep nappa synthetic leather according to claim 1, characterized in that: In step 1, the solid content of the one-component base resin is 45% and the modulus is 10 - 25 Kg / cm 2 .

3. The production process of the dyeable sheep nappa synthetic leather according to claim 2, characterized in that: In Step 1, the viscosity of the primer is controlled at 1000 - 1500 cps.

4. The production process of the stainable sheep nappa synthetic leather according to claim 3, characterized in that: In step 1, select the superfine fiber bass warp that has been finely ground. The superfine fiber bass warp is a high hydrolysis-resistant superfine fiber bass with a specification of 1.15 - 1.35 mm that has been finely ground with 240-mesh fine sandpaper before use. The superfine fiber bass warp is processed by a three-plate processor with an 80 + 100-mesh wheel to treat the bottom coating, and the coating amount is 60 - 80 g / m 2 , the drying temperature is 140 - 160 °C, and the drying time is 2 - 3 min.

5. The production process of the dyeable sheep nappa synthetic leather according to claim 1, characterized in that: In Step 2, the viscosity of the dyeable nappa leather treatment agent is controlled at 1000 - 1500 cps.

6. The production process of the dyeable sheep nappa synthetic leather according to claim 5, characterized in that: In Step 2, the microfiber base fabric coated with the sealing base material is treated with a 60+80 mesh wheel on a three-plate processor with a dyeable sheep leather treatment agent, and the coating amount is 70-90 g / m 2 , the drying temperature is 100-120 °C, and the drying time is 2-3 min.

7. The production process of the dyeable sheepskin-like microfiber synthetic leather according to claim 1, characterized in that: In Step 3, during the primary impregnating machine foaming treatment, the temperature of the impregnating machine is 170 - 180 °C, the vehicle speed is 15 m / min, and the foaming duration is 80 - 100 s.

8. The production process of the stainable sheep nappa synthetic leather according to claim 1, wherein: In Step 4, the dyeing temperature is 90 - 95 °C, and the dyeing time is 30 - 50 min.

9. The production process of the dyeable sheepskin-like superfine fiber synthetic leather according to claim 1, characterized in that: In Step 5, the drying temperature of the secondary impregnating machine is 140 - 160 °C, the vehicle speed is 8 - 10 m / min, and the drying duration is 2 - 3 min.

Images