Synthetic leather and application thereof

Abstract

The invention particularly discloses synthetic leather and application thereof. The synthetic leather provided by the invention comprises the base cloth layer, the bonding layer, the foaming layer, the compact layer, the isolation layer and the surface protection layer, and siloxane is introduced into the surface protection layer, so that the touch feeling of the synthetic leather is remarkably improved; meanwhile, the isolating layer is additionally arranged, and acrylic resin and carbodiimide are introduced into the isolating layer, so that the compactness of the isolating layer is improved, the plasticizer in the compact layer is prevented from being separated out, and the influence of the plasticizer on the surface touch of the synthetic leather is reduced; polyvinyl chloride with the molecular weight of 2000-2200 is selected in the compact layer and the foaming layer, so that the touch feeling of the synthetic leather is remarkably improved, and the synthetic leather has full touch feeling and has natural touch feeling similar to that of natural leather; the base cloth layer is made of the polyester-spandex mixed fabric, so that the touch feeling of the synthetic leather can be further improved while the high-elasticity requirement is met, the touch feeling of the synthetic leather is closer to that of natural leather, and the synthetic leather has a wide application prospect in the field of automotive interiors.

Description

Technical Field

[0001] The present invention relates to the technical field of synthetic leather, in particular to synthetic leather and application thereof. Background Art

[0002] With the sustained and rapid development of the national economy, my country's automobile industry has developed rapidly in recent years, and my country's automobile production has leapt into the forefront of the world. In recent years, people's demand for automobiles is no longer limited to means of transportation. Automobiles are more like mobile homes for people. Therefore, people have put forward higher requirements for the comfort of the driving environment.

[0003] The quality of automotive interior materials directly determines the quality of the interior decoration of the car and the level of comfort of the driving environment. At present, the commonly used automotive interior surface materials include genuine leather, PVC leather and fabric, among which PVC leather is the most widely used in automotive interiors due to its high cost performance, touch close to genuine leather, and higher grade than fabric. However, the existing PVC leather feels relatively hard and the surface feels astringent, especially after long-term use, the surface feel and tactile feel are worse. Therefore, developing a synthetic leather with excellent hand feel and tactile feel is of great significance to improving the quality of automotive interiors and the comfort of the driving environment. Summary of the invention

[0004] Aiming at the problem that synthetic leather used for automobile interior decoration in the prior art has a hard and rough touch, the present invention provides a synthetic leather and application thereof.

[0005] In order to solve the above technical problems, the technical solution provided by the present invention is:

[0006] A synthetic leather comprises a base fabric layer, a bonding layer, a foaming layer, a dense layer, an isolation layer and a surface protection layer arranged in sequence from inside to outside;

[0007] The raw materials of the surface protection layer include water-based polycarbonate polyurethane and siloxane; the raw materials of the isolation layer include water-based polycarbonate polyurethane, acrylic resin and carbodiimide; the raw materials of the dense layer include polyvinyl chloride resin with a molecular weight of 2000-2200 and a first plasticizer; the raw materials of the foaming layer include polyvinyl chloride resin with a molecular weight of 2000-2200, a second plasticizer and physical foaming microcapsules; the raw material of the base fabric layer is a polyester-spandex mixed fabric;

[0008] The first plasticizer includes di(2-propylheptyl)phthalate and dioctyl sebacate; the second plasticizer includes di(2-propylheptyl)phthalate and C9-C11 phthalate.

[0009] Compared with the prior art, the synthetic leather provided by the present invention significantly improves the wear resistance, stain resistance and noise resistance of the synthetic leather by introducing polycarbon type polyurethane and siloxane into the surface protection layer, and at the same time, also significantly improves the touch of the synthetic leather, so that the synthetic leather has a smooth, skin-friendly and soft touch; at the same time, an isolation layer is added, and acrylic resin and carbodiimide are introduced into the isolation layer, and a dense three-dimensional cross-linked network is formed by cross-linking of polycarbon type polyurethane, acrylic resin and carbodiimide, thereby increasing the density of the isolation layer to prevent the precipitation of plasticizers in the dense layer, reduce the influence of plasticizers on the surface touch of the synthetic leather, and avoid the occurrence of the problem of astringent surface touch; adding polyvinyl chloride to the dense layer, while ensuring lightweight, also helps to improve the bending resistance and wear resistance of the synthetic leather. The inventor also unexpectedly found that in the dense layer and Selecting polyvinyl chloride with a molecular weight of 2000-2200 in the foaming layer can also significantly improve the touch of synthetic leather, making the synthetic leather have a full touch and a natural touch similar to natural leather; further, adding a foaming layer and selecting a physical foaming agent can make the pores in the foaming layer more uniform, and the pores are mostly independent pores, which is beneficial to significantly improve the bending resistance and wear resistance of the synthetic leather, and can further enrich the fullness of the synthetic leather feel; selecting a polyester-spandex blended fabric for the base fabric layer can further improve the touch of the synthetic leather while taking into account the high elasticity requirements, making it closer to the touch of natural leather; in addition, selecting specific plasticizers in the dense layer and the foaming layer can reduce the precipitation of the plasticizer, and improve the flexibility of the synthetic leather, especially the flexibility at low temperatures, and help improve the touch of the synthetic leather.

[0010] The present invention provides the synthetic leather with a smooth, soft and skin-friendly touch through the cooperation of the uniquely arranged base fabric layer, adhesive layer, foaming layer, dense layer, isolation layer and surface protection layer, and has good flexibility in various environments, thereby increasing the comfort during use and having broad application prospects in the field of automotive interiors.

[0011] Preferably, the base fabric layer is made of interlock polyester-spandex blended fabric, wherein the mass content of polyester is 85%-90%.

[0012] Furthermore, the raw material of the base fabric layer is interlock weft knitted fabric, the mass content of polyester is 88%, and the mass content of spandex is 12%.

[0013] The preferred base fabric can ensure various mechanical property requirements of the synthetic leather, and can also improve the touch of the synthetic leather and increase the softness of the synthetic leather.

[0014] Preferably, the mass ratio of the water-based polycarbonate polyurethane to the siloxane in the surface protection layer is 100:10-15.

[0015] Preferably, the surface protection layer comprises the following raw material components in parts by weight: 100 parts of waterborne polycarbonate polyurethane, 10-15 parts of siloxane, 5-10 parts of bridging agent, 2-3 parts of leveling agent and 2-3 parts of matting agent.

[0016] Furthermore, the leveling agent is polyether-modified siloxane, and the matting agent is epoxy polyacrylate.

[0017] The various raw materials in the preferred surface protection layer cooperate with each other to improve the aging resistance, wear resistance and hydrolysis resistance of the synthetic leather. More importantly, it can also give the synthetic leather a smooth and skin-friendly touch, thereby improving the comfort of use.

[0018] Preferably, the mass ratio of the waterborne polycarbonate polyurethane, the acrylic resin and the carbodiimide in the isolation layer is 100:30-40:10-15.

[0019] Preferably, the isolation layer comprises the following raw material components in parts by mass: 100 parts of waterborne polycarbonate polyurethane, 30 parts to 40 parts of acrylic resin, 10 parts to 15 parts of carbodiimide, 2 parts to 3 parts of leveling agent and 2 parts to 3 parts of matting agent.

[0020] Furthermore, the leveling agent in the isolation layer is polyether-modified siloxane, and the matting agent is epoxy polyacrylate.

[0021] The preferred isolation layer can effectively reduce the precipitation of plasticizers in the dense layer, thereby avoiding the problem of the synthetic leather surface feeling rough; and the preferred isolation layer has high adhesion to the surface protection layer and the dense layer, which can effectively avoid the deviation of the surface protection layer and the dense layer, thereby effectively improving the wear resistance of the synthetic leather.

[0022] Preferably, the dense layer comprises the following raw material components in parts by weight: 100 parts of polyvinyl chloride resin, 80 parts to 90 parts of a first plasticizer, 3 parts to 5 parts of a stabilizer and 1 part to 10 parts of a color paste.

[0023] The preferred dense layer can improve the tensile strength and abrasion resistance of the synthetic leather.

[0024] Furthermore, the first plasticizer is di(2-propylheptyl) phthalate (DPHP) and dioctyl sebacate (DOS) in a mass ratio of 1-1.5:1, and the stabilizer is a calcium zinc stabilizer.

[0025] The preferred specific proportion of plasticizer and the amount of plasticizer added can reduce the precipitation of plasticizer, avoid the problem of synthetic leather feeling rough due to plasticizer precipitation, maintain the adhesion between the dense layer and the isolation layer and the foaming layer, and ensure the softness and bending resistance of the synthetic leather in low temperature and cold environment.

[0026] Preferably, the foaming layer comprises the following raw material components in parts by weight: 100 parts of polyvinyl chloride resin, 4-10 parts of physical foaming microcapsules, 80-90 parts of a second plasticizer, 3-5 parts of a stabilizer, 5-10 parts of a flame retardant and 1-10 parts of a color paste.

[0027] Furthermore, the foaming ratio of the foaming layer is 1.8-2.0.

[0028] Furthermore, the second plasticizer is di(2-propylheptyl)phthalate (DPHP) and C9-C11 phthalate (911) in a mass ratio of 1-1.5:1.

[0029] Furthermore, the physical foaming microcapsule is a pentane foaming microcapsule, the flame retardant is aluminum oxide, and the stabilizer is a calcium zinc stabilizer.

[0030] Generally speaking, it is difficult to balance bending resistance and wear resistance. Generally, hard synthetic leather has better wear resistance but poor bending resistance. Soft synthetic leather has good bending resistance, but generally poor wear resistance.

[0031] The preferred foaming layer can improve the elasticity and bending resistance of synthetic leather, and improve the air permeability and wear resistance of synthetic leather by selecting polyvinyl chloride resin and plasticizer with specific molecular weight. In addition, the foaming layer can also improve the low-temperature bending resistance of synthetic leather, and it is not easy to crack even when used in a low-temperature environment, thereby achieving the purpose of excellent wear resistance and bending resistance; in addition, it can also give the synthetic leather a rich touch.

[0032] It should be noted that the present invention has no special requirements for physical foaming microcapsules. Physical foaming microcapsules with a foaming ratio of 1.8-2.0 can meet the use requirements of the present invention and achieve basically equivalent technical effects.

[0033] Furthermore, the third plasticizer is di(2-propylheptyl)phthalate.

[0034] Furthermore, the flame retardant is aluminum oxide, and the stabilizer is calcium zinc stabilizer.

[0035] Preferably, the thickness of the base fabric layer is 0.6mm-0.8mm, the thickness of the adhesive layer is 0.04mm-0.06mm, the thickness of the foaming layer is 0.4mm-0.55mm, the thickness of the dense layer is 0.25mm-0.3mm, and the thickness of the surface treatment layer and the isolation layer are both 5μm-10μm.

[0036] The present invention also provides a method for preparing the above-mentioned synthetic leather, which comprises at least the following steps:

[0037] S1, weighing the raw material components of each layer according to the design ratio of the synthetic leather described in any one of the above items, mixing the raw material components of each layer evenly, filtering, and obtaining slurry of each layer;

[0038] S2, coating the dense layer slurry onto centrifugal paper and drying to obtain a dense layer;

[0039] S3, coating the foaming layer slurry on the dense layer and drying it to obtain the foaming layer;

[0040] S4, coating the adhesive layer slurry on the foaming layer, laminating the base fabric on the adhesive layer slurry, and drying;

[0041] S5, printing the isolation layer slurry and the surface protection layer slurry on the surface of the dense layer in sequence, drying, and embossing to obtain the synthetic leather.

[0042] Further, in combination with the above, the raw materials for the dense layer are mixed evenly and then passed through a 150-mesh filter, the raw materials for the foaming layer are mixed evenly and then passed through a 150-mesh filter, and the raw materials for the bonding layer are mixed evenly and then passed through a 120-mesh filter.

[0043] Further, in combination with the above, in step S2, the coating amount of the dense layer slurry is 250g / m 2 -260g / m 2 , coating speed is 20m / min-25m / min, and drying temperature is 160℃-190℃.

[0044] Further, in combination with the above, in step S3, the coating amount of the foaming layer slurry is 280g / m 2 -290g / m 2 , coating speed is 20m / min-25m / min, and drying temperature is 150℃-200℃.

[0045] Further, in combination with the above, in step S4, the coating amount of the bonding layer slurry is 80g / m 2 -90g / m 2 The coating speed is 20m / min-25m / min, and the drying temperature is 160℃-200℃.

[0046] Further, in combination with the above, in step S5, the printing temperature is 110°C-130°C, and the embossing temperature is 150°C-180°C.

[0047] The above preparation method is simple to operate, has no complicated steps, does not require special equipment, has low cost, is suitable for industrial large-scale production, and has broad market prospects.

[0048] The present invention also provides the use of any of the above-mentioned synthetic leathers in automobile interior decoration.

[0049] The synthetic leather provided by the present invention has excellent smoothness, skin affinity and softness, good low-temperature resistance and bending property, is not easy to crack even when used in a low-temperature environment, and can also meet the requirements of wear resistance. It has broad application prospects in the field of automobile interior decoration, is suitable for being used as synthetic leather for automobile interior decoration, and is particularly suitable for being used as synthetic leather for automobile seats and automobile steering wheels. It not only meets people's requirements for the comfort of the driving environment, but also improves the grade and market competitiveness of synthetic leather products, and has high promotion and application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 A schematic diagram of the structure of the synthetic leather prepared in an embodiment of the present invention; wherein 10, a base fabric layer, 20, an adhesive layer, 30, a foaming layer, 40, a dense layer, 50, an isolation layer, and 60, a surface protection layer;

[0051] Figure 2 This is a schematic diagram of testing the stiffness and softness of synthetic leather in an embodiment of the present invention;

[0052] Figure 3 This is a schematic diagram of testing the friction coefficient of synthetic leather in an embodiment of the present invention;

[0053] Figure 4 Schematic diagram of the values ​​of A, B, and C when calculating the friction coefficient of synthetic leather in an embodiment of the present invention;

[0054] Figure 5 It is a schematic diagram of testing the elongation under fixed load and residual deformation rate of synthetic leather in an embodiment of the present invention. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0056] The base fabric is made of 88% polyester and 12% spandex double rib weft knitted fabric with a thickness of 0.7mm and a density of 250g / m 2 .

[0057] Example 1

[0058] The embodiment of the present invention provides a synthetic leather, comprising a base fabric layer, an adhesive layer, a foaming layer, a dense layer, an isolation layer and a surface protection layer arranged in sequence from the inside to the outside; the base fabric layer has a thickness of 0.6 mm, the adhesive layer has a thickness of 0.06 mm, the foaming layer has a thickness of 0.55 mm, the dense layer has a thickness of 0.25 mm, the surface treatment layer has a thickness of 5 μm and the isolation layer has a thickness of 10 μm;

[0059] The surface protection layer comprises the following raw material components in parts by weight: 100 parts of waterborne polycarbonate polyurethane, 10 parts of siloxane, 5 parts of isocyanate, 2 parts of polyether-modified siloxane leveling agent and 2 parts of epoxy polyacrylate matting agent;

[0060] The isolation layer comprises the following raw material components in parts by weight: 100 parts of waterborne polycarbonate polyurethane, 30 parts of acrylic resin, 10 parts of carbodiimide, 2 parts of polyether modified siloxane leveling agent and 2 parts of epoxy polyacrylate matting agent;

[0061] The dense layer comprises the following raw material components in parts by weight: 100 parts of polyvinyl chloride resin, 80 parts of a first plasticizer, 3 parts of a calcium zinc stabilizer and 2 parts of a color paste; the first plasticizer is DPHP and DOS in a mass ratio of 1:1;

[0062] The foaming layer comprises the following raw material components in parts by weight: 100 parts of polyvinyl chloride resin, 4 parts of pentane foaming microcapsules, 80 parts of a second plasticizer, 3 parts of a calcium zinc stabilizer, 5 parts of aluminum oxide and 2 parts of a color paste; the second plasticizer is DPHP and 911 plasticizer in a mass ratio of 1:1;

[0063] The bonding layer includes the following raw material components in parts by weight: 100 parts of polyvinyl chloride resin, 80 parts of DPHP, 3 parts of calcium zinc stabilizer, 5 parts of aluminum oxide and 2 parts of color paste.

[0064] The molecular weight of the polyvinyl chloride resins used above is 2000.

[0065] The preparation method of the above synthetic leather comprises the following steps:

[0066] S1, according to the above-mentioned raw material design ratio of the dense layer, the weighed raw material components are blended, stirred at a rate of 1200r / min for 20min, and filtered through a 150-mesh filter to obtain a dense layer slurry;

[0067] According to the designed ratio of the raw materials for the foaming layer, the weighed raw material components are blended, stirred at a rate of 1200 r / min for 15 min, and filtered through a 150-mesh filter to obtain a foaming layer slurry;

[0068] According to the designed ratio of the raw materials for the bonding layer, the weighed raw material components are blended, stirred at a rate of 1200 r / min for 15 min, and filtered through a 120-mesh filter to obtain a dense layer slurry;

[0069] S2, apply the dense layer slurry onto the centrifugal paper with a coating amount of 250g / m 2 , coating speed is 20m / min, drying at 160℃, and a dense layer is obtained;

[0070] S3, coating the foaming layer slurry on the dense layer, with a coating amount of 280g / m 2 , the coating speed is 20m / min, and the foaming layer is obtained by drying at 150°C;

[0071] S4, coating the adhesive layer slurry on the foaming layer, with a coating amount of 80g / m 2 , the coating speed is 20m / min, and the base fabric is attached to the adhesive layer slurry and dried at 160℃;

[0072] S5, respectively mixing the raw materials of the isolation layer and the surface protection layer evenly to obtain the isolation layer slurry and the surface protection layer slurry, printing the isolation layer slurry and the surface protection layer slurry on the surface of the dense layer in sequence through a printing machine, the printing temperature is 110°C, drying, embossing at 150°C, to obtain the synthetic leather.

[0073] Example 2

[0074] The embodiment of the present invention provides a synthetic leather, comprising a base fabric layer, an adhesive layer, a foaming layer, a dense layer, an isolation layer and a surface protection layer arranged in sequence from the inside to the outside; the base fabric layer has a thickness of 0.7 mm, the adhesive layer has a thickness of 0.05 mm, the foaming layer has a thickness of 0.45 mm, the dense layer has a thickness of 0.27 mm, the surface treatment layer has a thickness of 9 μm and the isolation layer has a thickness of 8 μm;

[0075] The surface protection layer comprises the following raw material components in parts by weight: 100 parts of waterborne polycarbonate polyurethane, 12.5 parts of siloxane, 7.5 parts of isocyanate, 2.5 parts of polyether-modified siloxane leveling agent and 2.5 parts of epoxy polyacrylate matting agent;

[0076] The isolation layer comprises the following raw material components in parts by weight: 100 parts of waterborne polycarbonate polyurethane, 35 parts of acrylic resin, 12.5 parts of carbodiimide, 2.5 parts of polyether modified siloxane leveling agent and 2.5 parts of epoxy polyacrylate matting agent;

[0077] The dense layer comprises the following raw material components in parts by weight: 100 parts of polyvinyl chloride resin, 85 parts of a first plasticizer, 4 parts of a calcium zinc stabilizer and 6 parts of a color paste; the first plasticizer is DPHP and DOS in a mass ratio of 3:2;

[0078] The foaming layer comprises the following raw material components in parts by weight: 100 parts of polyvinyl chloride resin, 7 parts of pentane foaming microcapsules, 85 parts of a second plasticizer, 4 parts of a calcium zinc stabilizer, 7.5 parts of aluminum oxide and 6 parts of a color paste; the second plasticizer is DPHP and 911 plasticizer in a mass ratio of 3:2;

[0079] The bonding layer includes the following raw material components in parts by weight: 100 parts of polyvinyl chloride resin, 85 parts of DPHP, 4 parts of calcium zinc stabilizer, 7.5 parts of aluminum oxide and 6 parts of color paste.

[0080] The molecular weight of the polyvinyl chloride resins used above is 2100.

[0081] The preparation method of the above synthetic leather comprises the following steps:

[0082] S1, according to the above-mentioned raw material design ratio of the dense layer, the weighed raw material components are blended, stirred at a rate of 1200r / min for 20min, and filtered through a 150-mesh filter to obtain a dense layer slurry;

[0083] According to the designed ratio of the raw materials for the foaming layer, the weighed raw material components are blended, stirred at a rate of 1200 r / min for 15 min, and filtered through a 150-mesh filter to obtain a foaming layer slurry;

[0084] According to the designed ratio of the raw materials for the bonding layer, the weighed raw material components are blended, stirred at a rate of 1200 r / min for 15 min, and filtered through a 120-mesh filter to obtain a dense layer slurry;

[0085] S2, apply the dense layer slurry onto the centrifugal paper, with a coating amount of 255g / m 2 , coating speed is 22m / min, drying at 175℃, and a dense layer is obtained;

[0086] S3, coating the foaming layer slurry on the dense layer, with a coating amount of 285g / m 2 , coating speed is 22m / min, drying at 170℃, to obtain a foaming layer;

[0087] S4, coating the adhesive layer slurry on the foaming layer, with a coating amount of 85g / m 2 , the coating speed is 23m / min, and the base fabric is attached to the adhesive layer slurry and dried at 180℃;

[0088] S5, respectively mixing the raw materials of the isolation layer and the surface protection layer evenly to obtain the isolation layer slurry and the surface protection layer slurry, printing the isolation layer slurry and the surface protection layer slurry on the surface of the dense layer in sequence through a printing machine, the printing temperature is 120°C, drying, embossing at 160°C, to obtain the synthetic leather.

[0089] Example 3

[0090] The embodiment of the present invention provides a synthetic leather, comprising a base fabric layer, an adhesive layer, a foaming layer, a dense layer, an isolation layer and a surface protection layer arranged in sequence from the inside to the outside; the base fabric layer has a thickness of 0.8 mm, the adhesive layer has a thickness of 0.04 mm, the foaming layer has a thickness of 0.4 mm, the dense layer has a thickness of 0.3 mm, the surface treatment layer has a thickness of 10 μm and the isolation layer has a thickness of 5 μm;

[0091] The surface protection layer comprises the following raw material components in parts by weight: 100 parts of waterborne polycarbonate polyurethane, 15 parts of siloxane, 10 parts of isocyanate, 3 parts of polyether-modified siloxane leveling agent and 3 parts of epoxy polyacrylate matting agent;

[0092] The isolation layer comprises the following raw material components in parts by weight: 100 parts of waterborne polycarbonate polyurethane, 40 parts of acrylic resin, 15 parts of carbodiimide, 3 parts of polyether modified siloxane leveling agent and 3 parts of epoxy polyacrylate matting agent;

[0093] The dense layer comprises the following raw material components in parts by weight: 100 parts of polyvinyl chloride resin, 90 parts of a first plasticizer, 5 parts of a calcium zinc stabilizer and 10 parts of a color paste; the first plasticizer is DPHP and DOS in a mass ratio of 1.3:1;

[0094] The foaming layer comprises the following raw material components in parts by weight: 100 parts of polyvinyl chloride resin, 10 parts of pentane foaming microcapsules, 90 parts of a second plasticizer, 5 parts of a calcium zinc stabilizer, 10 parts of aluminum oxide and 10 parts of a color paste; the second plasticizer is DPHP and 911 plasticizer in a mass ratio of 1.3:1;

[0095] The bonding layer comprises the following raw material components in parts by weight: 100 parts of polyvinyl chloride resin, 90 parts of DPHP, 5 parts of calcium zinc stabilizer, 10 parts of aluminum oxide and 10 parts of color paste.

[0096] The molecular weight of the polyvinyl chloride resins used above is 2200.

[0097] The preparation method of the above synthetic leather comprises the following steps:

[0098] S1, according to the above-mentioned raw material design ratio of the dense layer, the weighed raw material components are blended, stirred at a rate of 1200r / min for 20min, and filtered through a 150-mesh filter to obtain a dense layer slurry;

[0099] According to the designed ratio of the raw materials for the foaming layer, the weighed raw material components are blended, stirred at a rate of 1200 r / min for 15 min, and filtered through a 150-mesh filter to obtain a foaming layer slurry;

[0100] According to the designed ratio of the raw materials for the bonding layer, the weighed raw material components are blended, stirred at a rate of 1200 r / min for 15 min, and filtered through a 120-mesh filter to obtain a dense layer slurry;

[0101] S2, apply the dense layer slurry onto the centrifugal paper, with a coating amount of 260g / m 2 , coating speed is 25m / min, drying at 190℃, and a dense layer is obtained;

[0102] S3, coating the foaming layer slurry on the dense layer, with a coating amount of 290g / m 2 , coating speed is 25m / min, drying at 200℃ to obtain a foaming layer;

[0103] S4, coating the adhesive layer slurry on the foaming layer, the coating amount is 90g / m 2 , the coating speed is 25m / min, and the base fabric is attached to the adhesive layer slurry and dried at 200℃;

[0104] S5, respectively mixing the raw materials of the isolation layer and the surface protection layer evenly to obtain the isolation layer slurry and the surface protection layer slurry, printing the isolation layer slurry and the surface protection layer slurry on the surface of the dense layer in sequence through a printing machine, the printing temperature is 130°C, drying, embossing at 180°C, to obtain the synthetic leather.

[0105] Comparative Example 1

[0106] This comparative example provides a synthetic leather, comprising a base fabric layer, an adhesive layer, a foaming layer, a dense layer, an isolation layer and a surface protection layer arranged in sequence from the inside to the outside; wherein the thickness of the base fabric layer, the adhesive layer, the foaming layer, the dense layer and the isolation layer and the raw material composition are the same as those in Example 2, except that silicone is not added to the surface protection layer, and the raw material components of the remaining surface protection layers are the same as those in Example 2.

[0107] The preparation method of the synthetic leather is the same as that in Example 2, and will not be described again here.

[0108] Comparative Example 2

[0109] This comparative example provides a synthetic leather, comprising a base fabric layer, an adhesive layer, a foaming layer, a dense layer, an isolation layer and a surface protection layer arranged in sequence from the inside to the outside; wherein the thickness of the base fabric layer, the adhesive layer, the foaming layer, the dense layer and the surface protection layer and the raw material composition are the same as those in Example 2, except that acrylic resin is not added to the isolation layer, and the raw material components of the remaining isolation layers are the same as those in Example 2.

[0110] The preparation method of the synthetic leather is the same as that in Example 2, and will not be described again here.

[0111] Comparative Example 3

[0112] This comparative example provides a synthetic leather, comprising a base fabric layer, an adhesive layer, a foaming layer, a dense layer, an isolation layer and a surface protection layer arranged in sequence from the inside to the outside; wherein the thickness of the base fabric layer, the adhesive layer, the dense layer, the isolation layer and the surface protection layer and the raw material composition are the same as those in Example 2, except that the foaming agent of the foaming layer is azodicarbonamide (ADC foaming agent), and the raw material components of the remaining foaming layers are the same as those in Example 2.

[0113] The preparation method of the synthetic leather is the same as that in Example 2, and will not be described again here.

[0114] Comparative Example 4

[0115] This comparative example provides a synthetic leather, comprising a base fabric layer, an adhesive layer, a foaming layer, a dense layer, an isolation layer and a surface protection layer arranged in sequence from the inside to the outside; the only difference from Example 2 is that the molecular weight of the polyvinyl chloride resin in the dense layer, the foaming layer and the adhesive layer is 1200, the raw material of the base fabric layer is 100% polyester, and the raw material composition and thickness of the remaining layers are the same as those in Example 2.

[0116] The preparation method of the synthetic leather is the same as that in Example 2, and will not be described again here.

[0117] Comparative Example 5

[0118] This comparative example provides a synthetic leather, comprising a base fabric layer, an adhesive layer, a foaming layer, a dense layer, an isolation layer and a surface protection layer arranged in sequence from the inside to the outside; the only difference from Example 2 is that the first plasticizer in the dense layer is DPHP and 911 plasticizer in a mass ratio of 3:2, and the raw material composition and thickness of the remaining layers are the same as those in Example 2.

[0119] The preparation method of the synthetic leather is the same as that in Example 2, and will not be described again here.

[0120] The synthetic leathers in the above Examples 1-3 and Comparative Examples 1-5 were subjectively evaluated according to the criteria shown in Table 1 below. The results are shown in Table 3.

[0121] Table 1 Subjective evaluation criteria

[0122]

[0123]

[0124] The synthetic leathers of Examples 1-3 and Comparative Examples 1-5 were objectively evaluated according to the following method. The results are shown in Table 3.

[0125] 1. Rigidity

[0126] Cut 5 synthetic leather specimens of 200mm×25mm in radial and weft directions respectively. Take the length direction as the test direction of the material. Place the specimen surface upward on the platform along the scale. The specimen length is parallel to the scale. The front end of the test is aligned with the upper edge of the slope. Press the pressing plate on the specimen. Do not change the position of the specimen. Slowly move the pressing plate toward one end of the slope of the test instrument (the pressing plate is directly pressed on the specimen and is always considered as a whole during the test) until the front end of the specimen contacts the 45° slope (such as Figure 1 The distance moved from the tail end of the pressing plate was recorded, and the measurement was repeated three times to take the average value.

[0127] 2. Friction coefficient

[0128] Cut a 100mm×150mm synthetic leather sample and place it horizontally on the test instrument (such as Figure 2 As shown in the figure, wool felt that complies with the provisions of GB / T 19089-2012 is wrapped on the friction head. The friction head has a size of 102mm×62mm and a load weight of 9.8N. It slides at a rate of 30mm / min. The load sensor records and calculates the average dynamic friction coefficient m and static friction coefficient I. The calculation formula is as follows:

[0129] I = A / W, where A is the peak value of the waveform, N; W is the load mass, N.

[0130] m=(B+C) / 2W, where B is the upper limit of the waveform, N; C is the lower limit of the waveform, N; W is the load mass, N. For the values ​​of each parameter, see Figure 3 shown.

[0131] 3. Elongation under fixed load and residual deformation

[0132] Cut three synthetic leather samples of 250mm×50mm in radial and weft directions respectively, with an initial gauge length of 100mm (e.g. Figure 4 As shown in the figure, one end of the sample is clamped in the upper fixture of the instrument, and the other end is clamped in the lower fixture of the instrument. The initial distance between the fixtures is 150mm. The weight is hung statically under the fixture (the total mass of the weight and the lower fixture is set to 2.5kg, 5kg, and 10kg, respectively). After maintaining this state for 5 minutes, the gauge length is measured and recorded under load (accurate to 0.5mm), and then the fixture and load on the sample are removed. Let it stand on a horizontal plane for 10 minutes, measure and record the gauge length again, and calculate the radial and latitudinal elongation d and residual deformation rate e under fixed load. The results are expressed as arithmetic mean values, accurate to 0.5%. The calculation formula is as follows:

[0133] d=(L1-100) / 100×100%

[0134] e=(L2-100) / 100×100%

[0135] Where, L1 is the gauge length after 5 minutes under load, mm;

[0136] L2 is the gauge length after the load is removed and the specimen is left standing on a horizontal surface for 10 minutes, in mm.

[0137] 4. Wear resistance

[0138] The test is carried out according to the test method specified in QB / T 2726-2005 "Determination of physical and mechanical wear resistance of leather".

[0139] Cut three Φ(106±1)mm circular specimens, grind wheel model CS-10, load 1 000g, and conduct abrasion test with the specimen surface facing upward. Visually observe the surface of the specimen after friction and record the friction revolutions of the exposed base fabric layer.

[0140] Table 3

[0141]

[0142] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent substitution or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A synthetic leather, It is characterized in that It includes a base fabric layer, an adhesive layer, a foaming layer, a dense layer, an isolation layer and a surface protection layer arranged in sequence from the inside to the outside; The raw materials of the surface protection layer include water-based polycarbonate polyurethane and siloxane; the raw materials of the isolation layer include water-based polycarbonate polyurethane, acrylic resin and carbodiimide; the raw materials of the dense layer include polyvinyl chloride resin with a molecular weight of 2000-2200 and a first plasticizer; the raw materials of the foaming layer include polyvinyl chloride resin with a molecular weight of 2000-2200, a second plasticizer and physical foaming microcapsules; the raw material of the base fabric layer is a polyester-spandex mixed fabric; The first plasticizer includes di(2-propylheptyl)phthalate and dioctyl sebacate; the second plasticizer includes di(2-propylheptyl)phthalate and C9-C11 phthalate.

2. The synthetic leather according to claim 1, It is characterized in that The raw material of the base fabric layer is interlock polyester-spandex mixed fabric, wherein the mass content of polyester is 85%-90%.

3. The synthetic leather according to claim 1, It is characterized in that The mass ratio of the water-based polycarbonate polyurethane to the siloxane in the surface protection layer is 100:10-15.

4. The synthetic leather according to claim 3, It is characterized in that The surface protection layer comprises the following raw material components in parts by weight: 100 parts of waterborne polycarbonate polyurethane, 10-15 parts of siloxane, 5-10 parts of bridging agent, 2-3 parts of leveling agent and 2-3 parts of matting agent.

5. The synthetic leather according to claim 1, It is characterized in that The mass ratio of the waterborne polycarbonate polyurethane, the acrylic resin and the carbodiimide in the isolation layer is 100:30-40:10-15.

6. The synthetic leather according to claim 5, It is characterized in that The isolation layer comprises the following raw material components in parts by mass: 100 parts of waterborne polycarbonate polyurethane, 30 parts to 40 parts of acrylic resin, 10 parts to 15 parts of carbodiimide, 2 parts to 3 parts of leveling agent and 2 parts to 3 parts of matting agent.

7. The synthetic leather according to claim 6, It is characterized in that The dense layer comprises the following raw material components in parts by weight: 100 parts of polyvinyl chloride resin, 80 parts to 90 parts of a first plasticizer, 3 parts to 5 parts of a stabilizer and 1 part to 10 parts of a color paste; and / or The foaming layer comprises the following raw material components in parts by weight: 100 parts of polyvinyl chloride resin, 4 parts to 10 parts of physical foaming microcapsules, 80 parts to 90 parts of a second plasticizer, 3 parts to 5 parts of a stabilizer, 5 parts to 10 parts of a flame retardant and 1 part to 10 parts of a color paste; and / or The bonding layer comprises the following raw material components in parts by weight: 100 parts of polyvinyl chloride resin, 80 parts to 90 parts of a third plasticizer, 3 parts to 5 parts of a stabilizer, 5 parts to 10 parts of a flame retardant and 1 part to 10 parts of a color paste.

8. The synthetic leather according to claim 7, It is characterized in that The leveling agent in the isolation layer is polyether-modified siloxane, and the matting agent is epoxy polyacrylate; and / or The first plasticizer in the dense layer is di(2-propylheptyl)phthalate and dioctyl sebacate in a mass ratio of 1-1.5:1; and / or The second plasticizer in the foaming layer is di(2-propylheptyl)phthalate and C9-C11 phthalate in a mass ratio of 1-1.5:1; and / or The third plasticizer in the bonding layer is di(2-propylheptyl)phthalate; and / or The physical foaming microcapsules in the foaming layer are pentane foaming microcapsules; and / or The flame retardants in the foaming layer and the bonding layer are both aluminum oxide; and / or The stabilizers in the dense layer, the foamed layer and the bonding layer are all calcium zinc stabilizers.

9. The synthetic leather according to any one of claims 1 to 8, It is characterized in that The thickness of the base fabric layer is 0.6mm-0.8mm, the thickness of the adhesive layer is 0.04mm-0.06mm, the thickness of the foaming layer is 0.4mm-0.55mm, the thickness of the dense layer is 0.25mm-0.3mm, and the thickness of the surface treatment layer and the isolation layer are both 5μm-10μm.

10. Use of the synthetic leather according to any one of claims 1 to 8 in automobile interior decoration.

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