A production process of tencel fiber leather

Abstract

The present invention discloses a production process for tencel fiber leather, and the process steps are as follows: 1) The base fabric selects a non-woven fabric containing lyocell fiber, and the composition of the non-woven fabric includes lyocell fiber, nylon and polyester, wherein the content ratio of lyocell fiber is 35-40%; 2) The selected non-woven fabric is impregnated in an impregnating material to obtain an impregnated non-woven fabric; 3) The prepared fabric is coated on the impregnated non-woven fabric to obtain a semi-finished synthetic leather; 4) The semi-finished synthetic leather is sent to a three-fold folding coagulation tank for coagulation, and then successively undergoes water washing, pre-ironing, drying and cooling to obtain a finished tencel fiber leather. By using a non-woven fabric containing tencel fiber as the base fabric and combining with the wet-process PU process, through innovative design of the process and addition ratio, on the basis of overcoming the adverse effects of lyocell fiber on the overall physical properties of the fiber leather, the inherent advantages of lyocell fiber are fully utilized to produce a synthetic leather with high environmental protection, high recyclability and high added value.

Description

Technical Field

[0001] The present invention relates to the field of synthetic leather production and manufacturing, and specifically refers to a production process for tencel fiber leather. Background Art

[0002] In recent years, due to the sustainable qualifications of wood-based cellulose fibers, there has been an increasing interest in lignocellulose fibers. Wood-based cellulose fibers are made from the natural polymer cellulose. Production starts from wood or other plant materials, from which cellulose pulp is extracted, and then the polymer is shaped into fibers and filaments using different technologies (viscose, modal, sol). Artificial fibers have the same properties as natural fibers. In addition to a high level of comfort, they have better water absorption / drainage than cotton and are widely used as clothing raw materials because they are harmless to the human body and are very popular. However, viscose fibers are prone to shrinkage and wrinkling, and the manufacturing process is complicated. A large amount of chemicals are used in the process of dissolving pulp, causing pollution problems such as environmental and wastewater treatment. For the above reasons, research has been conducted on manufacturing methods that are environmentally friendly and harmless to the human body. As a result, a method for producing lyocell fibers using tertiary amine oxide hydrate to dissolve pulp has been invented. It is produced through a solution spinning process. In this process, the pulp is directly dissolved in tertiary amine oxide hydrate without producing derivatives. The spinning solution is spun into fibers through a dry-wet spinning process using a spinneret. The fibers produced by this method are generally referred to as cellulose fibers. The solvent used in this process is an organic compound that is harmless to the human body. The currently widely used solvent is n-methyl-morpholine-n-oxide. It minimizes the impact on the environment. As a cellulose fiber, lyocell can be completely naturally degraded.

[0003] Lyocell fiber (tencel) is a brand-new textile and clothing fabric that can be added to various fabrics to form fabrics containing lyocell fibers. Lyocell fibers have many functional advantages, such as being soft and skin-friendly, having good breathability, and being antibacterial. However, due to the inherent properties of lyocell fibers, they will have certain adverse effects on the physical properties of fabrics containing lyocell fibers. Therefore, the current application of lyocell fiber fabrics in synthetic leather is limited. In view of this, this case conducts in-depth research on the above problems and proposes a production process for fiber leather made from tencel fiber cloth, and this case is thus generated. Summary of the Invention

[0004] The purpose of the present invention is to provide a production process for tencel fiber leather. Through the excellent combination of the wet PU process and lyocell fibers, it not only ensures that the overall physical properties are met, but also gives full play to the advantages of lyocell fibers, and produces a highly environmentally friendly, recyclable, and high-value-added lyocell fiber synthetic leather.

[0005] To achieve the above objective, the solution of the present invention is:

[0006] A Tencel fiber leather production process, the process steps are as follows:

[0007] 1) The base fabric is a non-woven fabric containing lyocell fiber, which comprises lyocell fiber, nylon and polyester, wherein the content of lyocell fiber accounts for 35%-40%, the content of nylon accounts for 25-30%, and the content of polyester accounts for 35-40%.

[0008] 2) The selected non-woven fabric is impregnated in the impregnation material to obtain an impregnated non-woven fabric; the formula of the impregnation material is as follows: 100 parts of resin, 200 parts of dimethylformamide, 9-11 parts of tear-resistant additives, 1-3 parts of anionic surfactants, 1-3 parts of hydrolysis-resistant additives, 1-3 parts of leveling agents, 1-1.5 parts of softeners, and 10-15 parts of color pastes; the resin is a hydrolysis-resistant impregnation resin that does not contain fluorine compounds, and the 100% modulus is 25-30;

[0009] 3) coating the prepared fabric on the impregnated non-woven fabric to obtain a synthetic leather semi-finished product; the formula of the fabric is as follows according to the mass parts of the components: 100 parts of resin, 40 parts of dimethylformamide, 1-2 parts of anionic active agent, 0.3-0.6 parts of hydrolysis resistance auxiliary agent, 0.8-1.2 parts of foaming agent, and 1-3 parts of color paste; the resin is a polyester-polyether blended resin that does not contain fluorine compounds, and the 100% modulus is 50-55;

[0010] 4) sending the semi-finished synthetic leather into a three-fold coagulation tank for coagulation to form synthetic leather; washing, pre-ironing, drying and cooling the synthetic leather sent out of the three-fold coagulation tank to obtain a finished Tencel fiber leather.

[0011] In the step 1), the thickness of the nonwoven fabric is controlled at 0.7-0.8 mm, the weight is 190-210 g, and the burst is 16 kgf / cm 2 , tensile strength in warp direction >260N / 3CM, in weft direction >260N / 3CM, elongation at break in warp direction 40-70, in weft direction 50-90, tear strength >50.

[0012] In the step 1), the preparation process of the non-woven fabric body is carried out according to the process steps of opening and cleaning → combing → laying → needling → calendering; wherein, in the opening and mixing step, the curtain climbing speed is set to 10-15% at a low speed; in the needling step, the needle depth is set to 9-10mm, the needle frequency is set to 200-300, and the needling density is set to 2000-2500c / cm 2 ; The draft ratio between the input and output of the needle loom is 20-25%, and the number of needle punches is 300-400c / cm 2 .

[0013] In step 2), the prepared impregnating material is stirred at a stirring speed of 1000 - 1500 r / min at room temperature for 15 - 20 minutes until completely dissolved, and the viscosity is controlled at 200 - 260 cps.

[0014] In step 3), the prepared fabric is rapidly stirred at a stirring speed of 1000 - 1500 r / min at room temperature for 30 - 35 minutes until completely dissolved; stir until the slurry is uniform, reduce the stirring speed to 300 ± 50 r / min and perform vacuum degassing for 90 min, and the viscosity is controlled at 14000 cps - 16000 cps.

[0015] In step 3), the coating gap is controlled between 205 ± 5 filaments, and the coating weight is controlled at 1.3 ± 0.05 kg / y.

[0016] In step 4), the water washing operation is carried out in 15 groups. The sugar concentration of the first six groups of water washing is controlled at 20 - 10%, the sugar concentration of the middle six groups of water washing is controlled at 10 - 0%, and the sugar concentration of the last three groups of water washing is 0%; and the water washing temperature of the last three groups is controlled at 70℃ ± 5.

[0017] In step 4), the pre - ironing of the ironing roller is carried out in eight rounds at a temperature of 110 ± 10℃; five groups of ovens are set. Among them, the oven temperature of the first group is 150℃, the oven temperatures of the second to fourth groups are 160℃, and the oven temperature of the fifth group is 140℃ until completely dried.

[0018] After adopting the above - mentioned scheme, the beneficial effects of the present invention compared with the prior art are as follows: For a production process of tencel fiber leather in this application, a non - woven fabric with a high content of tencel fiber (lyocell fiber) is used as the base fabric, combined with the wet - process PU process. Through the comprehensive innovative design of the process and the proportion of added components, on the basis of overcoming the adverse effects of lyocell fiber on the overall physical properties of the fiber leather, the inherent advantages of lyocell fiber are fully exerted, and a synthetic leather with high environmental protection, recyclability, and high added value is produced, which meets both the physical properties and high - added - value requirements such as hand feeling. In this case, the base fabric is particularly limited, and the production process is innovatively adjusted in combination on the basis of the existing process steps. Without a complicated fabric structure and process, excellent - quality tencel fiber leather can be made in a one - continuous - operation manner.

[0019] Drawings of the specification

[0020] Figure 1 This is the process flow chart of the present invention.

[0021] Label description

[0022] Storage rack 1, ironing roller 2, impregnating and coating device 3, triple - fold coagulation tank 4, water washing tank 5, ironing roller 6, oven 7, cooling roller 8, winding rack 9. DETAILED DESCRIPTION

[0023] The case is further described in detail below in conjunction with specific implementation methods.

[0024] This case involves a Tencel fiber leather production process, and the Tencel fiber refers to the lyocell fiber produced by Lenzing in particular. Tencel fiber (lyocell fiber) has the functional advantages of being environmentally friendly, soft, skin-friendly, and breathable. However, due to the characteristics of lyocell fiber itself, it will have an adverse effect on the tensile strength, tear strength, hand feel, and production process quality assurance of the overall fabric in its application, and the higher the content of lyocell fiber, the more obvious the adverse effect. Therefore, the current application of lyocell fiber, especially in synthetic leather, is only added in a small amount and plays an auxiliary role, which also makes it impossible to fully take into account the functionality and high environmental protection and recycling advantages of Tencel fiber.

[0025] Here, this application is committed to developing a Tencel synthetic leather that can fully utilize the advantages of Tencel fiber (functionality, high environmental recycling) and meet the physical properties with high added value (good hand feel, tear strength, tensile strength). The technical solution adopted is a comprehensive design of three specific aspects: base fabric selection and process, coating, impregnation formula design, and PU wet process, and the three aspects are interrelated and promoted.

[0026] This case is a Tencel fiber leather production process, the process steps are as follows:

[0027] 1) The base fabric is a non-woven fabric containing lyocell fiber, which contains lyocell fiber, nylon and polyester, of which the content of lyocell fiber accounts for 35%-40%, the content of nylon accounts for 25-30%, and the content of polyester accounts for 35-40%;

[0028] 2) The selected non-woven fabric is impregnated in the impregnation material to obtain an impregnated non-woven fabric; the formula of the impregnation material is as follows: 100 parts of resin, 200 parts of dimethylformamide, 9-11 parts of tear-resistant additives, 1-3 parts of anionic surfactants, 1-3 parts of hydrolysis-resistant additives, 1-3 parts of leveling agents, 1-1.5 parts of softeners, and 10-15 parts of color pastes; the resin is a hydrolysis-resistant impregnation resin that does not contain fluorine compounds, and the 100% modulus is 25-30;

[0029] 3) Coating the prepared fabric onto the impregnated non-woven fabric; specifically, passing the impregnated non-woven fabric through a coating doctor blade to coat the prepared fabric onto the impregnated non-woven fabric, obtaining a semi-finished synthetic leather; the formula of the fabric is based on component mass parts as follows: 100 parts of resin, 40 parts of dimethylformamide, 1 - 2 parts of anionic surfactant, 0.3 - 0.6 parts of hydrolysis-resistant auxiliary agent, 0.8 - 1.2 parts of foaming agent, 1 - 3 parts of color paste; the resin is a polyester-polyether blend resin without fluorine compounds, and the hundred percent modulus is 50 - 55;

[0030] 4) Feeding the semi-finished synthetic leather into a three-fold return coagulation tank for coagulation to form synthetic leather; for the three-fold return coagulation tank, specifically, it is preferably controlled that the coagulation time is 7 - 9 minutes; in a specific design, the total length of the three-fold return is 80 meters, the vehicle speed is 9 - 11 m / min (preferably 10 m / min) for coagulation, and the time reaches about 8 minutes; the synthetic leather sent out from the coagulation tank is successively passed through water washing, pre-ironing, drying and cooling to obtain the finished tencel fiber leather. Specifically, the synthetic leather sent out from the coagulation tank is fed into a water washing tank for water washing to form base fabric; the base fabric sent out from the water washing tank is successively passed through pre-ironing by an ironing roller, drying in an oven and cooling by a cooling roller, and finally the finished tencel fiber leather is obtained.

[0031] First, we notice that the selection and setting of the base fabric is an important step. The set goal is to have as high a content of lyocell fiber as possible and to make the overall physical properties tend to be stable. The overall physical properties include the interlayer peel strength, tensile strength and tear strength of the base fabric layer. The adopted solution is that the non-woven fabric composition includes lyocell fiber, nylon and polyester, where the content ratio of lyocell fiber is 35% - 40%, the content ratio of nylon is 25 - 30%, and the content ratio of polyester is 35 - 40%. The high content ratio of lyocell fiber has a greater impact on the physical properties of the non-woven fabric. Using it as the base fabric of the fiber leather, its entanglement performance is weaker than that of ordinary needle-punched base fabric. Therefore, its tear strength, peel strength, breaking strength and other indicators are all weaker than those of ordinary base fabric.

[0032] Therefore, the composition of the base non-woven fabric in this case particularly includes nylon and polyester. The relatively high-strength nylon and polyester fibers are used to balance the overall hand comfort and overall physical property indicators. Through a large number of mixing experiments with different addition ratios, the content of Lyocell fiber is finally set at 35-40%, making the overall physical properties better and more stable. Some experimental data are as follows: when the content of Lyocell fiber is 10-15%, the interlayer peel strength of the test base fabric is 110N / 3CM, the tensile strength is above 350N, and the tear strength is above 80N. When the content is 20-25%, the interlayer peel strength of the test base fabric is between 90-100N, the tensile strength is between 300-320N, and the tear strength is between 65-70N. By comparison, it can be found that the more Lyocell fiber is added, the lower the physical properties of the base fabric will be, and the improvement and stability of the overall physical properties by the nylon and polyester components are not obvious. In this case, further experiments are carried out. Adjusting the content of Lyocell fiber to 35-40% (35% is the optimal solution) best meets our requirements. The nylon and polyester components have a more obvious improvement and stability on the overall physical properties. The interlayer peel strength of the test base fabric is 80N, the tensile strength is 260N / 3CM, and the tear strength is 50N. The physical properties of this base fabric are on the low side, but the overall physical properties are within the limit that can be improved through subsequent process adjustments and can meet the final requirements.

[0033] On this basis, to ensure that a product that meets the physical property requirements and is stable is finally produced, corresponding adjustments related to the PU wet process are made subsequently to improve the overall physical properties. In the PU wet process, not only the improvement of physical properties such as the tensile and tear strengths of the base fabric needs to be considered, but also issues such as the overall touch and feel, breathability and softness of the product need to be noted. Comprehensive design is mainly carried out from the configuration of the impregnating material and the coating fabric, as well as the setting of process parameters.

[0034] In the configuration of the impregnating material, in the selection of the impregnating resin, a hydrolysis-resistant impregnating resin is used, which does not contain fluorine compounds. Its solid content is 29-32%, the modulus at 100% is 25-30, the tensile strength > 15MPa, and the viscosity range is 100,000-120,000. When this resin solidifies in an aqueous DMF solution, the speed is relatively fast, the cell pores will be larger, which is also helpful for improving the overall breathability and hand feel. Particularly, considering the tear strength issue from the perspective of the impregnating material, an anti-tear aid is added in an appropriate amount to the impregnating material formula to improve the adhesion between the base fabric fibers, ensuring that the tear strength can meet the requirements. At the same time, a softening agent aid is also added in the formula to improve the overall softness. The addition ratio of the anti-tear aid needs to be a specific appropriate value. Through experimental comparison, when 5 parts of the anti-tear aid are added, the tear strength is about 55N, and the strength is on the low side; when 15 parts are added, the tear strength can reach 70N, but there is a problem that the back touch is sticky. It is verified that when 9-11 parts (the optimal value is 10 parts) of the anti-tear aid are added, the tear strength can reach above 60N, and the back touch will not be sticky.

[0035] In the configuration of the coated fabric, the coating resin is a polyester-polyether blended resin, which has a high solid content, excellent leather rebound resilience, high peel strength, and no fluorine compounds in the resin. Its solid content is 35-38%, the modulus at 100% is 50-55, the tensile strength > 45 MPa, the elongation at break ≥ 500, and the viscosity range is 160,000-180,000. According to the coated fabric formula, the obtained fabric has high peel strength and relatively fine pores; on this basis, the pores are comprehensively adjusted in the coating formula. By adding a foaming agent to the formula, the pores of the wet layer are enlarged to achieve an excellent matching effect of the air permeability of the base cloth, and at the same time, the softness of the overall hand feeling is improved, making the overall hand feeling have better rebound resilience. There are special requirements for the dosage of the foaming agent. Too little will not play a role in pore adjustment, and too much will affect the peel strength; after a large number of experiments, the addition amount is determined to be 0.8-1.2 parts (the optimal value is 1 part), and at the same time, it must be combined with the adjustment of the machine process. By appropriately increasing the setting time through the three-fold folding setting tank in the subsequent process, the overall optimal solution of air permeability, peel physical properties, and softness is finally achieved.

[0036] Through a large number of experiments in this case, the finally adopted production process plan is to select a fluorine-free resin with a suitable modulus for matching. The tear strength is improved by adding a tear-resistant aid in the impregnating material formula, and the pores of the PU coating are enlarged by adding a foaming agent in the coating formula. At the same time, it is also combined with the adjustment of the machine process in the subsequent process. By combining the coating pores, formula, and production process, the produced tencel fiber leather products meet both physical properties and requirements such as hand feeling. The base cloth of the product is selected to contain a high content of lyocell fiber components, which has the advantages of health safety and sustainable environmental friendliness. Through the special selection of the base cloth and the improvement and adjustment of the PU wet process, through the excellent combination of the two, the produced tencel fiber leather is not only highly environmentally friendly but also has a high added value, with good skin-friendly properties, good rebound resilience, soft hand feeling, good air permeability, and a certain antibacterial effect.

[0037] In this case, the base cloth of the fiber leather is selected as a non-woven fabric with a high lyocell fiber content. This special non-woven fabric, as the only fiber layer structure of the fiber leather, has a certain effect on the overall support, so as to finally ensure the stability of the entire fiber leather product. The key lies in the special selection of the base cloth of the fiber leather in this case and the realization of its excellent combination with the designed PU wet process.

[0038] Example 1

[0039] On the basis of the process steps of the tencel fiber leather production process described above, Example 1 is specifically proposed as Figure 1 shown. A tencel fiber leather production process has the following process steps:

[0040] 1) Unroll the selected non-woven fabric containing lyocell fiber from the fabric storage rack 1, then pass it through the ironing roller 2, and then send it into the impregnating and coating device 3;

[0041] 2) Perform impregnation and coating operations before and after the impregnation and coating device 3; specifically, in the coating operation, at the coating table device equipped with a coating knife, coat the fabric configured by the above method on the non-woven fabric along the scraper; after feeding, obtain a semi-finished synthetic leather, pay attention to observing the surface condition of the coating, and handle any abnormalities in a timely manner;

[0042] 3) Feed the semi-finished synthetic leather (the coated surface layer) into the three-fold folding coagulation tank 4 for coagulation. Through coagulation in the three-fold folding coagulation tank, the coagulation time in the coagulation tank is increased, making the slurry coagulate more fully and the pores finer;

[0043] 4) After the synthetic leather comes out of the coagulation tank, then enter the water washing tank 5 for water washing;

[0044] 5) After coming out of the water washing tank 5, the base fabric is successively pre-ironed by the ironing roller 6, dried in the oven 7, and cooled by the cooling roller 8 to obtain the finished tencel fiber leather, which can finally be wound by the winding rack 9.

[0045] In the above process steps, each step has its own preferred solutions. Among them:

[0046] In the above step 1), the fabric storage rack 1 unwinds, and its vehicle speed is controlled at 10 m / min.

[0047] In the above step 2), control the thickness of the coating by adjusting the scraper gap. The coating gap is controlled between 205 ± 5 filaments, and the coating application amount is 1.3 ± 0.05 kg / y.

[0048] In the above step 3), during the coagulation operation, the coagulation sugar content is controlled at 18 - 21% (the sugar content is the DMF concentration in the DMF aqueous solution, and the data is obtained by measuring with an Abbe refractometer. The following sugar contents are all obtained in this way), and the temperature is controlled at 30 ± 2°C. In addition, the single-fold length of the three-fold folding coagulation tank 4 is preferably set at 30 meters.

[0049] In the above step 4), after the synthetic leather comes out of the coagulation tank, immediately observe the surface condition, and measure the thickness and width. The thickness is controlled between 1.30 - 1.35 mm, and the width is between 1.41 - 1.45 m. In addition, generally 15 groups of water washing tanks are set. The water washing sugar content of the first six groups is controlled at 20 - 10%, the water washing sugar content of the middle six groups is controlled at 10 - 0%, and the water washing sugar content of the last three groups is 0%; the water washing temperature of the last three groups is controlled at 70 ± 5°C.

[0050] In step 5) above, the base fabric after the water washing tank 5 is first pre-ironed by an eight-round ironing roller (at a temperature of 110 ± 10 °C). The pre-ironed base fabric is then dried in an oven. The oven temperatures it passes through in sequence are as follows: the oven temperature of the first group is 150 °C, the oven temperatures of the second to fourth groups are 160 °C, and the oven temperature of the fifth group is 140 °C until it is completely dried. The coiled thickness after drying is 1.15 - 1.25 mm, and the width is 145 - 147 cm.

[0051] According to the above production process, a tencel fiber synthetic leather can be made in a continuous operation mode. For the produced base fabric, when testing the 3-cm double-sided peeling, it can reach 100 N / 3 cm, and the softness test value is between 2.3 and 2.6.

[0052] The following table shows the test situation of the relevant parameters of the tencel fiber synthetic leather prepared according to the production process of Example 1.

[0053]

[0054] Example 2

[0055] Based on the process steps of the above-mentioned tencel fiber leather production process, in step 2), the formulation of the impregnating material is by component mass fraction: 100 parts of resin, 200 parts of dimethylformamide, 10 parts of anti-tearing aid, 1 part of anionic surfactant, 1 part of hydrolysis resistance aid, 1 part of leveling agent, 1 part of softening agent, and 12 parts of color paste. The resin is a hydrolysis-resistant impregnating resin without fluorine compounds, with a solid content of 30% and a hundred percent modulus of 30.

[0056] Example 3

[0057] Based on the process steps of the above-mentioned tencel fiber leather production process, in step 3), the formulation of the fabric is by component mass fraction: 100 parts of resin, 40 parts of dimethylformamide, 1 part of anionic surfactant, 0.5 part of hydrolysis resistance aid, 1 part of foaming agent, and 2 parts of color paste. The resin is a polyester-polyether blend resin without fluorine compounds, with a solid content of 35% and a hundred percent modulus of 50.

[0058] Example 4

[0059] Based on the process steps of the above-mentioned tencel fiber leather production process, for the non-woven fabric containing lyocell fiber, its thickness is controlled at 0.7 - 0.8 mm, the gram weight (weight per square meter) is 190 - 210 g, the bursting strength is 16 kgf / cm 2 , the tensile strength in the warp direction > 260, in the weft direction > 260, the elongation at break in the warp direction is 40 - 70, in the weft direction is 50 - 90, and the tear strength > 50.

[0060] Example 5

[0061] On the basis of the process steps of the above-mentioned production process of tencel fiber leather, or on the basis of Example 4, for the non-woven fabric containing lyocell fiber, the main production process still follows the conventional process of opening and cleaning → carding → web laying → needling → calendering.

[0062] Compared with the traditional mature blending process, due to the addition of a high content of lyocell fiber in this case, the following adjustments are made in the process: Among them, in the opening and mixing step, the low-speed setting of the curtain climbing speed is 10-15%; in the needling step, the needle depth is set at 9-10 mm, the needle frequency is 200-300, and the needling density is 2000-2500 c / cm 2 ; the draft ratio between the input and output of the needling machine is 20-25%, and the number of needling times is 300-400 c / cm 2 .

[0063] In the above-mentioned opening and mixing process, the low-speed setting of the curtain climbing speed is 10-15%, preferably 15%. In this way, while ensuring the uniformity of the fibers, the rotation speed is minimized to ensure the damage of viscose fibers. In the needling process, considering the problem that lyocell viscose fibers are prone to breakage, especially, the needle depth and needle frequency should not be set too high. The needling density is set not less than 2000 c / cm, preferably 2000-2500 c / cm 2 , and the draft ratio between the input and output of the needling machine is adjusted within the range of 20-25%, so that the embryo cloth will not be pulled too tightly. In addition, during the use of needling, the number of needling times is controlled at 300-400 c / cm 2 , and the needles are replaced alternately to keep the comprehensive curve of the use of the needles within a reasonable range to avoid problems of quality fluctuations of the base cloth.

[0064] Example 6

[0065] On the basis of the process steps of the above-mentioned production process of tencel fiber leather, in step 2), in the preparation of the impregnating material, since the solidification speed of the impregnating resin is relatively fast and the cell holes will be relatively large, in order to ensure the hand feeling, it is solved by adjusting the viscosity of the impregnating material. Specifically, the prepared impregnating material is stirred at a stirring speed of 1000-1500 r / min at room temperature for 15-20 minutes until the resin, color paste, and hydrolysis-resistant additive are completely dissolved, and the viscosity is controlled at 200-260 cps.

[0066] Example 7

[0067] Based on the process steps of the above-mentioned production process of tencel fiber leather, in step 3), the prepared fabric is subjected to high-speed stirring at a stirring speed of 1000 - 1500 r / min at room temperature for 30 - 35 minutes until the polyurethane, filler, color paste, and hydrolysis-resistant additive are completely dissolved; the stirring time of the fabric during high-speed stirring is strictly controlled between 30 - 35 minutes. If the time is too short, the slurry may not be stirred sufficiently, and if the time is too long, the temperature of the material will be too high, resulting in dead material. Stir until the slurry is uniform, reduce the stirring speed to 300 ± 50 r / min and perform vacuum degassing for 90 min, and control the viscosity at 14000 cps - 16000 cps (temperature 32°C).

[0068] The above are only the preferred embodiments of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention shall fall within the scope of the claims of the present invention.

Claims

1. A production process of tencel fiber leather, characterized in that, The process steps are as follows: 1) The base fabric is a non-woven fabric containing lyocell fiber, and the non-woven fabric contains lyocell fiber, nylon and polyester, wherein the content of lyocell fiber accounts for 35%-40%, the content of nylon accounts for 25-30%, and the content of polyester accounts for 35-40%; 2) The selected non-woven fabric is impregnated in the impregnation material to obtain an impregnated non-woven fabric; the formula of the impregnation material is as follows: 100 parts of resin, 200 parts of dimethylformamide, 9-11 parts of tear-resistant additives, 1-3 parts of anionic surfactants, 1-3 parts of hydrolysis-resistant additives, 1-3 parts of leveling agents, 1-1.5 parts of softeners, and 10-15 parts of color pastes; the resin is a hydrolysis-resistant impregnation resin that does not contain fluorine compounds, and the 100% modulus is 25-30; 3) coating the prepared fabric on the impregnated non-woven fabric to obtain a synthetic leather semi-finished product; the formula of the fabric is as follows according to the mass parts of the components: 100 parts of resin, 40 parts of dimethylformamide, 1-2 parts of anionic active agent, 0.3-0.6 parts of hydrolysis resistance auxiliary agent, 0.8-1.2 parts of foaming agent, and 1-3 parts of color paste; the resin is a polyester-polyether blended resin that does not contain fluorine compounds, and the 100% modulus is 50-55; 4) sending the semi-finished synthetic leather into a three-fold coagulation tank for coagulation to form synthetic leather; washing, pre-ironing, drying and cooling the synthetic leather sent out of the three-fold coagulation tank to obtain a finished Tencel fiber leather.

2. The production process of a tencel fiber leather as described in claim 1, characterized in that, In the said step 1), the thickness of the non-woven fabric is controlled at 0.7 - 0.8 mm, the gram weight is 190 - 210 g / m 2 , the bursting strength is 16 kgf / cm 2 , the tensile strength in the warp direction > 260 N / 3CM, in the weft direction > 260 N / 3CM, the elongation at break in the warp direction is 40 - 70%, in the weft direction is 50 - 90%, and the tear strength > 50 N / 3CM.

3. The production process of a tencel fiber leather according to claim 1, characterized in that, In the step 2), the prepared impregnation material is stirred at room temperature at a stirring speed of 1000-1500 r / min for 15-20 minutes until it is completely dissolved, and the viscosity is controlled at 200-260 cps.

4. The production process of a tencel fiber leather according to claim 1, characterized in that, In the step 3), the prepared fabric is stirred at a high speed of 1000-1500 r / min at room temperature for 30-35 minutes until it is completely dissolved; stirred until the slurry is uniform, the stirring speed is reduced to 300±50 r / min and vacuum degassing is performed for 90 minutes, and the viscosity is controlled at 14000cps-16000cps.

5. The production process of a tencel fiber leather as described in claim 1, characterized in that, In the step 3), the coating gap is controlled between 205±5 μm and the coating weight is controlled between 1.3±0.05 kg / y.

6. The production process of a tencel fiber leather according to claim 1, characterized in that, In the step 4), the water washing operation is performed through 15 groups of water washing, the sugar content of the first six groups of water washing is controlled at 20-10%, the sugar content of the middle six groups of water washing is controlled at 10-0%, and the sugar content of the last three groups of water washing is 0%; and the water washing temperature of the last three groups is controlled at 70℃±5.

7. The production process of a tencel fiber leather according to claim 1, characterized in that, In the step 4), the pre-ironing is performed through eight rounds at a temperature of 110±10°C; five groups of ovens are provided, wherein the oven temperature of the first group is 150°C, the oven temperature of the second to fourth groups is 160°C, and the oven temperature of the fifth group is 140°C, until the clothes are completely dried.

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