Artificial leather based on vinyl polyolefin elastomer and preparation method thereof

Abstract

The invention provides artificial leather based on a vinyl polyolefin elastomer and a preparation method of the artificial leather, and belongs to the technical field of polyolefin and artificial leather. The artificial leather based on the vinyl polyolefin elastomer comprises base cloth, a bonding layer coating the base cloth and an artificial leather layer covering the bonding layer, and the artificial leather layer comprises, by weight, 100 parts of the vinyl polyolefin elastomer, 0.01-5 parts of a cross-linking agent, 0.01-5 parts of an assistant cross-linking agent and 0.01-5 parts of a coupling agent; wherein the melt index of the vinyl polyolefin elastomer is 1-15g / 10min, the number-average molecular weight of the vinyl polyolefin elastomer is 100,000-800,000, the molecular weight distribution index of the vinyl polyolefin elastomer is 1.0-2.0, the melting point of the vinyl polyolefin elastomer is 40-90 DEG C, the branching degree of the vinyl polyolefin elastomer is 30-120 branched chains per 1000 carbons, and the density of the vinyl polyolefin elastomer is 0.860-0.9 g / cm < 3 >.

Description

Technical Field

[0001] The invention belongs to the technical field of polyolefin elastomer and artificial leather, and in particular relates to an artificial leather based on vinyl polyolefin elastomer and a preparation method thereof. Background Art

[0002] Traditional artificial leather materials such as polyvinyl chloride (PVC) and polyurethane (PU) have gradually exposed some problems, such as easy aging, limited comfort, and the use of toxic and harmful organic solvents or other additives in the preparation process, resulting in poor environmental performance. Therefore, the research and development of new artificial leather materials has become an important task. Summary of the invention

[0003] In view of the above technical problems, the present invention provides an artificial leather based on vinyl polyolefin elastomer and a preparation method thereof, in order to at least partially solve the above technical problems. Therefore, the technical solution provided by the present invention is as follows.

[0004] As a first aspect of the present invention, an artificial leather based on vinyl polyolefin elastomer is provided, comprising: a base fabric, an adhesive layer coated on the base fabric, and an artificial leather layer covered on the adhesive layer; wherein, in parts by weight, the artificial leather layer comprises: 100 parts of vinyl polyolefin elastomer, 0.01-5 parts of a cross-linking agent, 0.01-5 parts of an auxiliary cross-linking agent, and 0.01-5 parts of a coupling agent; wherein the vinyl polyolefin elastomer has a melt index of 1-15 g / 10 min, a number average molecular weight of 100,000-800,000, a molecular weight distribution index of 1.0-2.0, a melting point of 40° C.-90° C., a branching degree of 30-120 branches / 1000 carbons, and a density of 0.860-0.9 g / cm 3 .

[0005] As a second aspect of the present invention, a method for preparing artificial leather based on vinyl polyolefin elastomer is provided, comprising: uniformly mixing the vinyl polyolefin elastomer, a crosslinking agent, a co-crosslinking agent and a coupling agent to obtain a mixed material; casting the mixed material into a film to obtain an artificial leather layer; coating a binder on a base fabric to form an adhesive layer, covering the artificial leather layer on the adhesive layer, and obtaining the artificial leather by vacuum lamination.

[0006] In an embodiment of the present invention, the artificial leather based on vinyl polyolefin elastomer is composed of a base fabric, an adhesive layer coated on the base fabric, and an artificial leather layer covered on the adhesive layer, wherein the vinyl polyolefin elastomer (EPOE) is a thermoplastic elastomer, which combines the processability of plastics and the elastic properties of rubber, and has excellent elasticity, impact resistance, aging resistance and chemical resistance. It is used as an artificial leather layer material, and the prepared artificial leather based on vinyl polyolefin elastomer can be a substitute for traditional PVC and PU artificial leather, and can be applied to a variety of application scenarios. In addition, the artificial leather based on vinyl polyolefin elastomer does not require the use of plasticizers, organic solvents or other chemical additives during the preparation process, and compared with traditional PVC and PU, the emission of volatile organic compounds (VOCs) is lower, it has better environmental friendliness, and the prepared product is safer and more environmentally friendly. In addition, the preparation process of the artificial leather based on vinyl polyolefin elastomer provided by the present invention is relatively simple, has low energy consumption, high preparation efficiency, does not contain organic solvents, does not cause harm to the human body and the environment, and has good environmental protection characteristics. DETAILED DESCRIPTION

[0007] In view of the environmental protection, easy aging and comfort problems gradually exposed by traditional PVC and PU artificial leather materials, the present invention proposes to use vinyl polyolefin elastomer as a raw material to prepare artificial leather. The obtained artificial leather based on vinyl polyolefin elastomer has the performance advantages of high peel strength, aging resistance and chemical resistance, and the preparation process is relatively simple, and no toxic and harmful solvents are used, which will not cause harm to the human body and the environment.

[0008] Specifically, the first aspect of the present invention provides an artificial leather based on vinyl polyolefin elastomer, comprising: a base fabric, an adhesive layer coated on the base fabric, and an artificial leather layer covered on the adhesive layer, wherein the artificial leather layer comprises, by weight: 100 parts of vinyl polyolefin elastomer, 0.01-5 parts of a cross-linking agent, 0.01-5 parts of an auxiliary cross-linking agent, and 0.01-5 parts of a coupling agent; wherein the melt index of the vinyl polyolefin elastomer is 1-15 g / 10 min, and the number average molecular weight (M n ) is 100,000-800,000, and the molecular weight distribution index (PDI = M w / M n , M w The weight average molecular weight is 1.0-2.0, the melting point is 40℃-90℃, the branching degree is 30-120 branches / 1000 carbons, and the density is 0.860-0.9g / cm 3 .

[0009] In an embodiment of the present invention, the artificial leather of vinyl polyolefin elastomer provided by the present invention comprises: a base fabric, an adhesive layer formed by coating the base fabric, and an artificial leather layer covering the adhesive layer. Vinyl polyolefin elastomer (EPOE) is a thermoplastic elastomer that combines the processability of plastics and the elastic properties of rubber, as well as its wide range of melt index and high number average molecular weight, so that it has excellent elasticity, impact resistance and chemical resistance. It is used as a raw material for preparing artificial leather. Under the action of a cross-linking agent, a co-cross-linking agent and a coupling agent, the vinyl polyolefin elastomer is interconnected to form a network structure, which can further improve the strength, heat resistance, wear resistance and elasticity, so that the obtained artificial leather also has excellent elasticity, impact resistance and chemical resistance, and is also endowed with the processing convenience of plastics and the elastic properties of rubber, so that it can become a substitute for traditional PVC and PU artificial leather products. Specifically, EPOE has a wide range of melt index, wherein the higher the melt index, the better the fluidity of EPOE, the easier the processing, but the mechanical properties of the product may be reduced. Therefore, in the production of artificial leather, the use of an appropriate melt index can ensure the fluidity of EPOE during processing, so that it can be evenly covered on the substrate to form a smooth surface. The branching degree of EPOE is low, and the molecular chain is more regular, which helps to improve its crystallinity and density, so in the production of artificial leather, the lower branching degree can make the EPOE molecules more closely arranged, increasing the hardness and wear resistance of the material. Higher density means that the distance between EPOE molecules is smaller and the intermolecular force is stronger, which will lead to an increase in the hardness of the material, and also improve its chemical corrosion resistance and wear resistance, so in the production of artificial leather, appropriate density can make the artificial leather have sufficient strength and durability. Higher number average molecular weight usually means that the EPOE molecular chain is longer, which will increase the strength and toughness of the material, so in the production of artificial leather, higher number average molecular weight can make the artificial leather have better tear resistance and durability. Further, it is necessary to select suitable EPOE raw materials according to specific application requirements, and optimize these parameters by adjusting processing conditions to obtain excellent performance artificial leather products. In addition, the vinyl polyolefin elastomer-based artificial leather provided by the present invention does not contain plasticizers or other potentially harmful chemical additives, so that the prepared artificial leather is safer, has lower volatile organic compound emissions, and is more environmentally friendly.

[0010] According to an embodiment of the present invention, the vinyl polyolefin elastomer is produced by Hefei Zhongke Kele New Materials Co., Ltd., which is obtained by catalyzing the polymerization reaction of ethylene monomer under the action of a diimine nickel catalyst and a co-catalyst. Since only ethylene monomer is used as a raw material, the cost of synthesizing the vinyl polyolefin elastomer is significantly reduced, thereby reducing the cost of preparing artificial leather based on the vinyl polyolefin elastomer. Further, the diimine nickel catalyst has a structure as shown in formula (1).

[0011] Formula (1); wherein R1 and R8 are independently selected from any one of hydrogen, C1-C6 alkyl, halogen, halogen-substituted C1-C6 alkyl, nitro, C1-C6 alkoxy, and trifluoromethyl; R2, R7, R9, R 12 are each independently selected from hydrogen, C1-C6 alkyl, halogen, and halogen-substituted C1-C6 alkyl; R3, R6, R 10 , R 11 R4 and R5 are each independently selected from any one of hydrogen, C1-C6 alkyl, halogen, halogen-substituted C1-C6 alkyl, phenyl, and diphenylmethyl; R4 and R5 are each independently selected from any one of hydrogen, C1-C6 alkyl, C1-C6 haloalkyl, phenyl, C6-C 30 wherein X is selected from any one of halogen, C1-C6 alkane, C2-C6 alkene, allyl or benzyl.

[0012] According to an embodiment of the present invention, the cocatalyst used in the process of synthesizing vinyl polyolefin elastomer is selected from at least one of alkylaluminoxane, alkylaluminum, phenylaluminum, alkylaluminum chloride and borate. The molar ratio of the cocatalyst to the diimine nickel catalyst is (1-5000):1.

[0013] According to an embodiment of the present invention, the artificial leather further comprises: at least one of 0.01-2 parts of light stabilizer, 0.01-2 parts of antioxidant, and 0.01-0.05 parts of pigment. The light stabilizer is selected from at least one of salicylates, benzophenones, benzotriazoles, substituted acrylonitriles, triazines, and hindered amines; the antioxidant is selected from at least one of hindered phenols, p-phenylenediamines, diaryl secondary amines, ketoamines, thioethers, phosphites, and phosphates.

[0014] In an embodiment of the present invention, light stabilizers and / or antioxidants are added to make the obtained artificial leather have good light aging resistance and heat aging resistance and are not easy to fade under light. The artificial leather of vinyl polyolefin elastomer (EOPE artificial leather) is transparent in color. By adding pigments, the artificial leather has more application scenarios, such as automotive interiors, sporting goods, furniture, fashion or accessories. Vinyl polyolefin elastomer combines the processability of plastics with the elastic properties of rubber, and different patterns can be hot-pressed on the obtained artificial leather. It should be noted that the pigment is a color pigment that can be purchased or a color pigment that can be mixed and adjusted, which is not further limited here.

[0015] According to an embodiment of the present invention, the artificial leather layer includes, by weight: 100 parts of vinyl polyolefin elastomer, 0.1-3 parts of crosslinking agent, 0.1-3 parts of auxiliary crosslinking agent, 0.1-2 parts of coupling agent, 0.1-2 parts of light stabilizer, and 0.1-2 parts of antioxidant.

[0016] According to an embodiment of the present invention, the melt index of the vinyl polyolefin elastomer is 1-14 g / 10 min, more preferably 1-6 g / 10 min. The artificial leather based on the vinyl polyolefin elastomer obtained within this range has higher peel strength and tensile strength and is more durable.

[0017] According to an embodiment of the present invention, the thickness of the adhesive layer is 0.01-1 mm. If the thickness of the adhesive layer is too low, it is easy to cause the base fabric and the artificial leather layer to separate. If the adhesive layer is too thick, it is easy to penetrate into the interior of the artificial leather layer during the preparation process, reducing the softness of the artificial leather layer. The thickness of the artificial leather layer is 0.01-5 mm. Within this range, the artificial leather obtained has a high peel strength, and the obtained artificial leather meets the requirements of toughness and softness.

[0018] According to an embodiment of the present invention, the base fabric is selected from any one of plain woven fabric, knitted fabric, non-woven fabric, microfiber fabric, and spunlace fabric. Other woven or non-woven fabrics suitable for artificial leather may also be used, which is not limited in detail herein; the adhesive layer is a cured product of at least one of acrylic emulsion, polyvinyl acetate (EVA) emulsion, polyurethane emulsion, and epoxy resin emulsion.

[0019] According to an embodiment of the present invention, the cross-linking agent is a peroxide cross-linking agent. Specifically, the peroxide cross-linking agent is selected from tert-butyl peroxy isopropyl carbonate, tert-butyl peroxy carbonate-2-ethylhexyl, 1,1-bis (tert-butyl peroxy) -3,3,5-trimethylcyclohexane, 1,1-bis (tert-butyl peroxy) cyclohexane, peroxy (2-ethylhexyl) tert-amyl carbonate, 2,2-bis (tert-butyl peroxy) butane, peroxy-3,5,5-trimethyl hexanoic acid tert-butyl ester, 1,3-bis (tert-butyl peroxy isopropyl) benzene at least one. The cross-linking agent forms a network structure of linear vinyl polyolefin elastomers by forming covalent bonds or ionic bonds between vinyl polyolefin elastomers, thereby enhancing the strength and durability of the artificial leather based on vinyl polyolefin elastomers, making it more tough, while wear resistance and peel strength are significantly enhanced.

[0020] According to an embodiment of the present invention, the auxiliary crosslinking agent is selected from at least one of trimethylolpropane triacrylate, propoxylated trimethylolpropane triacrylate, triallyl isocyanurate, trimethylolpropane trimethacrylate, ethoxylated trimethylolpropane triacrylate, trimethallyl isocyanate, and pentaerythritol triacrylate. The auxiliary crosslinking agent is used to assist the crosslinking agent in promoting the completion of the crosslinking reaction, and at the same time adjust the crosslinking density of the artificial leather to balance the strength and softness of the artificial leather. The auxiliary crosslinking agent can also improve the processing performance and physical properties (such as wear resistance and heat resistance) of the artificial leather.

[0021] According to an embodiment of the present invention, the coupling agent is selected from at least one of 3-(methacryloyloxy)propyltrimethoxysilane, 3-glycidylpropyltrimethoxysilane, vinyltrimethoxysilane, 3-aminopropyltriethoxysilane, vinyltriethoxysilane, triisostearoyl isopropyl titanate, and isopropyl tri(dioctyl pyrophosphate) titanate. The coupling agent can improve the processing performance and physical properties (such as heat resistance and chemical corrosion resistance) of artificial leather.

[0022] As a second aspect of the present invention, a method for preparing the artificial leather based on vinyl polyolefin elastomer in the above-mentioned embodiment is also provided, comprising: uniformly mixing the vinyl polyolefin elastomer, a cross-linking agent, a co-cross-linking agent and a coupling agent to obtain a mixed material; casting the mixed material into a film to obtain an artificial leather layer; after coating an adhesive on a base fabric to form an adhesive layer, covering the artificial leather layer on the adhesive layer, and obtaining the artificial leather by vacuum lamination.

[0023] In the embodiments of the present invention, the process for manufacturing artificial leather based on vinyl polyolefin elastomer is relatively simple, does not contain organic solvents, and has low volatile organic compound (VOCs) emissions, which will not affect the human body or the environment. In addition, the artificial leather based on vinyl polyolefin elastomer prepared by the method provided by the present invention has high peel strength and good aging resistance. Therefore, due to the lightweight, non-toxicity and excellent physical properties of artificial leather made of vinyl polyolefin elastomer, it becomes a sustainable substitute for traditional PVC and PU artificial leather materials.

[0024] According to an embodiment of the present invention, a method for preparing artificial leather based on vinyl polyolefin elastomer comprises: uniformly mixing at least one of a light stabilizer, an antioxidant, and a pigment with a vinyl polyolefin elastomer, a cross-linking agent, a co-cross-linking agent, and a coupling agent to obtain a mixed material; casting the mixed material into a film to obtain an artificial leather layer; after coating a binder on a base fabric to form an adhesive layer, covering the artificial leather layer on the adhesive layer, and obtaining the artificial leather by vacuum lamination.

[0025] According to an embodiment of the present invention, the adhesive is selected from at least one of acrylic emulsion, EVA emulsion and polyurethane emulsion.

[0026] According to an embodiment of the present invention, the temperature of the cast film is 80-100°C; the temperature of the vacuum lamination is 120-150°C. No crosslinking will occur within the temperature range of the cast film, so as to ensure that the vinyl polyolefin elastomer undergoes a crosslinking reaction during the lamination process, thereby ensuring the performance of the prepared artificial leather based on the vinyl polyolefin elastomer. During the vacuum lamination process, the adhesive and the adhered surface molecules or segments (vinyl polyolefin elastomer, base fabric) are in constant thermal motion, causing mutual diffusion or penetration, so that the interface between the adhesive and the adherend gradually disappears, forming a mutually interwoven and firm structure, thereby ensuring the peel strength of the artificial leather of the vinyl polyolefin elastomer, and facilitating the crosslinking reaction of the vinyl polyolefin elastomer. Further, the time of vacuum lamination is 1-5min, preferably 2min. If the vacuum lamination time is too short (e.g. <1min), the base fabric, adhesive layer and artificial leather layer will not be firmly bonded, and they will be easily delaminated during use. If the vacuum lamination time is too long (>5min), the preparation cost will increase, and it will easily cause the adhesive to penetrate into the artificial leather layer, which will reduce the flexibility and breathability of the vinyl polyolefin elastomer artificial leather, and accelerate the aging process of the vinyl polyolefin elastomer artificial leather. In addition, the vacuum lamination time is related to the melt index of the vinyl polyolefin elastomer. Generally speaking, the higher the melt index of the vinyl polyolefin elastomer, the shorter the vacuum lamination time; the lower the melt index of the vinyl polyolefin elastomer, the longer the vacuum lamination time.

[0027] The technical solution of the present invention is described in detail below in conjunction with specific embodiments.

[0028] The performance test methods of artificial leather based on vinyl polyolefin elastomer (EPOE) are as follows.

[0029] The cross-linking degree of the artificial leather layer is tested according to the xylene extraction method in 5.5.3 of GB / T29848-2018 "Ethylene-vinyl acetate copolymer (EVA) film for photovoltaic module encapsulation".

[0030] The peel strength of artificial leather is tested according to GB8808-1988 soft composite plastic material peeling test method, wherein method B is used for testing.

[0031] The heat aging property of artificial leather shall be tested according to 6.24 of GB / T4043-2010 “Polyvinyl chloride artificial leather for automobiles” to determine the discoloration level after heat aging, and the tensile strength of artificial leather after heat aging shall be tested according to 6.5 of this method.

[0032] The light aging resistance of artificial leather is tested according to the light aging method 6.22 in GB / T4043-2010 "Polyvinyl chloride artificial leather for automobiles", and the fading level is recorded. The tensile strength after light aging is tested according to 6.5 of this method.

[0033] The light color fastness grade of artificial leather is in accordance with GB / T8427-2019 Textiles Color Fastness Tests for Artificial Light Color Fastness Xenon Arc Flakes, where the test conditions are exposure cycle A1.

[0034] Example 1

[0035] An artificial leather based on vinyl polyolefin elastomer comprises, in sequence, a base fabric, an adhesive layer coated on the base fabric, and an artificial leather layer vacuum laminated on the adhesive layer, wherein the base fabric is a non-woven fabric; the adhesive layer is a cured product of EVA emulsion, and the thickness of the adhesive layer is 0.1 mm; the artificial leather layer comprises, by weight: 100 parts of EPOE with a melt index of 1 g / 10 min, 0.7 parts of tert-butyl peroxycarbonate-2-ethylhexyl ester (crosslinking agent), 0.5 parts of triallyl isocyanurate (co-crosslinking agent), 0.5 parts of 3-(methacryloyloxy)propyltrimethoxysilane (coupling agent), 0.1 parts of hindered amine light stabilizer UV770 (bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate), and 0.1 parts of hindered phenol antioxidant 1076 (β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate of n-octadecyl alcohol). Among them, the melt index of EPOE is 1g / 10min, the number average molecular weight is 370,000, the molecular weight distribution index is 1.8, the melting point is 86°C, the branching degree is 41 branches / 1000 carbons, and the density is 0.891g / cm 3 .

[0036] Specifically, the steps for preparing the artificial leather based on vinyl polyolefin elastomer in Example 1 are as follows: EPOE, crosslinking agent, auxiliary crosslinking agent, coupling agent, light stabilizer, antioxidant are weighed according to the above-mentioned weight parts and mixed evenly to obtain a mixed material. The obtained mixed material is cast into a film at 100°C to obtain an artificial leather layer. Subsequently, an EVA emulsion is coated on the non-woven fabric (base fabric) to form an adhesive layer. Then, the prepared artificial leather layer is covered on the adhesive layer, and an artificial leather based on vinyl polyolefin elastomer (referred to as EPOE artificial leather) is obtained after vacuum lamination, wherein the vacuum lamination temperature is 145°C and the vacuum lamination time is 2min. The physical property parameters of the EPOE artificial leather prepared in Example 1 are shown in Table 1.

[0037] Example 2

[0038] Example 2 The EPOE artificial leather was prepared by the same method as in Example 1, except that the melt index of the vinyl polyolefin elastomer (EPOE) was 3 g / 10 min, the number average molecular weight was 300,000, the molecular weight distribution index was 1.8, the melting point was 80 ° C, the branching degree was 58 branches / 1000 carbons, and the density was 0.882 g / cm 3The physical property parameters of the EPOE artificial leather prepared in Example 2 are shown in Table 1.

[0039] Example 3

[0040] Example 3 The EPOE artificial leather was prepared by the same method as in Example 1, except that the melt index of the vinyl polyolefin elastomer (EPOE) was 6 g / 10 min, the number average molecular weight was 220,000, the molecular weight distribution index was 1.9, the melting point was 76 ° C, the branching degree was 75 branches / 1000 carbons, and the density was 0.873 g / cm 3 The physical property parameters of the EPOE artificial leather prepared in Example 3 are shown in Table 1.

[0041] Example 4

[0042] Example 4 The EPOE artificial leather was prepared by the same method as in Example 1, except that the melt index of the vinyl polyolefin elastomer (EPOE) was 9 g / 10 min, the number average molecular weight was 180,000, the molecular weight distribution index was 2.0, the melting point was 72 ° C, the branching degree was 108 branches / 1000 carbons, and the density was 0.869 g / cm 3 The physical property parameters of the EPOE artificial leather prepared in Example 4 are shown in Table 1.

[0043] Further, the same method as in Example 4 was used to explore the effect of different vacuum lamination times on the peeling of EPOE artificial leather, wherein the vacuum lamination times were 70s, 90s, 120s, 150s, and 180s, respectively, and the peeling method was manual peeling. It was found through testing that when the vacuum lamination time was 70s and 90s, the artificial leather layer in the prepared EPOE artificial leather could be peeled off, while the vacuum lamination time was 120s, 150s, and 180s and could not be peeled off.

[0044] Example 5

[0045] Example 5 The EPOE artificial leather was prepared by the same method as in Example 1, except that the melt index of the vinyl polyolefin elastomer (EPOE) was 14 g / 10 min, the number average molecular weight was 150,000, the molecular weight distribution index was 2.0, the melting point was 63 ° C, the branching degree was 116 branches / 1000 carbons, and the density was 0.865 g / cm 3 The physical property parameters of the EPOE artificial leather prepared in Example 5 are shown in Table 1.

[0046] Comparative Example

[0047] Comparative Example 1

[0048] An artificial leather based on polyolefin elastomer comprises, in sequence, a base fabric, an adhesive layer coated on the base fabric, and an artificial leather layer vacuum laminated on the adhesive layer, wherein the base fabric is a non-woven fabric; the adhesive layer is a cured product of EVA emulsion, and the thickness of the adhesive layer is 0.1 mm; the artificial leather layer comprises, by weight: 100 parts of Dow's 8450 polyolefin elastomer (POE) with a melt index of 3 g / 10 min, 0.7 parts of tert-butyl peroxycarbonate-2-ethylhexyl ester (crosslinking agent), 0.5 parts of triallyl isocyanurate (co-crosslinking agent), 0.5 parts of 3-(methacryloyloxy)propyltrimethoxysilane (coupling agent), 0.1 parts of hindered amine light stabilizer UV770, and 0.1 parts of hindered phenol antioxidant 1076.

[0049] Specifically, the steps of preparing the polyolefin elastomer-based artificial leather in Comparative Example 1 are as follows.

[0050] Dow's 8450 (POE), crosslinking agent, auxiliary crosslinking agent, coupling agent, light stabilizer, antioxidant are weighed according to the above weight parts and mixed evenly to obtain a mixed material. The obtained mixed material is cast into a film at 100°C to obtain an artificial leather layer. Subsequently, EVA emulsion is coated on the non-woven fabric (base fabric) to form a bonding layer. Then, the prepared artificial leather layer is covered on the bonding layer, and after vacuum lamination, an artificial leather based on polyolefin elastomer (referred to as POE artificial leather) is obtained, wherein the vacuum lamination temperature is 145°C and the vacuum lamination time is 2min. The physical property parameters of the POE artificial leather prepared in Comparative Example 1 are shown in Table 1.

[0051] Comparative Example 2

[0052] Comparative Example 2 uses the same method as Comparative Example 1 to prepare artificial leather based on polyolefin elastomer, the only difference being that the polyolefin elastomer (POE) is Dow's 8660, and the melt index is 4.8 g / 10 min. The physical property parameters of the POE artificial leather prepared in Comparative Example 2 are shown in Table 1.

[0053] Comparative Example 3

[0054] Comparative Example 3 uses the same method as Comparative Example 1 to prepare artificial leather based on polyolefin elastomer, the only difference being that the polyolefin elastomer (POE) is Dow's 8669 and the melt index is 14 g / 10 min. The physical property parameters of the POE artificial leather prepared in Comparative Example 3 are shown in Table 1.

[0055] Table 1

[0056]

[0057] In Table 1, compared with POE artificial leather prepared by polyolefin elastomer (POE), the EPOE artificial leather prepared by vinyl polyolefin elastomer (EPOE) with different melt indexes in the present invention has higher peel strength and excellent heat aging and light aging resistance, which can reach the performance of traditional artificial leather prepared by PVC or PU. This shows that the EPOE provided by the present invention is expected to replace traditional PVC and PU to prepare artificial leather, and the preparation process is relatively simple, does not contain organic solvents, and has high environmental protection properties.

[0058] Furthermore, polyolefin elastomer (POE) is a copolymer of ethylene and α-olefin (such as 1-octene), and its preparation cost is relatively high, while the vinyl polyolefin elastomer (EPOE) in the present invention is an ethylene polymer, and the synthetic raw materials are relatively simple and low in cost. Therefore, the artificial leather based on vinyl polyolefin elastomer prepared by the present invention has excellent performance and lower cost. In addition, under the same preparation process conditions, the artificial leather prepared by the present invention using vinyl polyolefin elastomer is softer than the artificial leather prepared by polyolefin elastomer, and the softness of the artificial leather can be regulated by regulating the melt index of the vinyl polyolefin elastomer, while the traditional artificial leather prepared by polyolefin elastomer needs to adjust the softness through a post-processing process, and the process is more complicated.

[0059] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An artificial leather based on vinyl polyolefin elastomer, characterized in that: The artificial leather comprises: a base fabric, an adhesive layer coated on the base fabric, and an artificial leather layer covered on the adhesive layer; Wherein, in parts by weight, the artificial leather layer comprises: 100 parts of vinyl polyolefin elastomer, 0.01-5 parts of cross-linking agent, 0.01-5 parts of auxiliary cross-linking agent, 0.01-5 parts of coupling agent; The vinyl polyolefin elastomer has a melt index of 1-15 g / 10 min, a number average molecular weight of 100,000-800,000, a molecular weight distribution index of 1.0-2.0, a melting point of 40°C-90°C, a branching degree of 30-120 branches / 1000 carbons, and a density of 0.860-0.9 g / cm 3 .

2. The artificial leather according to claim 1, characterized in that: The artificial leather layer also includes: At least one of 0.01-2 parts of light stabilizer, 0.01-2 parts of antioxidant, and 0.01-0.05 parts of pigment.

3. The artificial leather according to claim 1 or 2, characterized in that: The thickness of the adhesive layer is 0.01-1 mm, and the thickness of the artificial leather layer is 0.01-5 mm.

4. The artificial leather according to claim 1, characterized in that: The base fabric is selected from any one of plain woven fabric, knitted fabric, non-woven fabric, microfiber fabric, and spunlace fabric; The bonding layer is a solidified product of at least one of acrylic emulsion, polyvinyl acetate emulsion, polyurethane emulsion and epoxy resin emulsion; The crosslinking agent is a peroxide crosslinking agent, and the peroxide crosslinking agent is selected from at least one of tert-butyl peroxy isopropyl carbonate, tert-butyl peroxy-2-ethylhexyl carbonate, 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane, 1,1-bis(tert-butyl peroxy)cyclohexane, tert-amyl peroxy (2-ethylhexyl) carbonate, 2,2-bis(tert-butyl peroxy)butane, tert-butyl peroxy-3,5,5-trimethylhexanoate, and 1,3-bis(tert-butyl peroxy isopropyl)benzene; The auxiliary crosslinking agent is selected from at least one of trimethylolpropane triacrylate, propoxylated trimethylolpropane triacrylate, triallyl isocyanurate, trimethylolpropane trimethacrylate, ethoxylated trimethylolpropane triacrylate, trimethallyl isocyanate, and pentaerythritol triacrylate; The coupling agent is selected from at least one of 3-(methacryloyloxy)propyltrimethoxysilane, 3-glycidylpropyltrimethoxysilane, vinyltrimethoxysilane, 3-aminopropyltriethoxysilane, vinyltriethoxysilane, triisostearoyl isopropyl titanate, and isopropyl tri(dioctyl pyrophosphate) titanate.

5. The artificial leather according to claim 2, characterized in that: The light stabilizer is selected from at least one of salicylates, benzophenones, benzotriazoles, substituted acrylonitriles, triazines, and hindered amines; The antioxidant is selected from at least one of hindered phenols, p-phenylenediamines, diaryl secondary amines, ketoamines, thioethers, phosphites and phosphates.

6. The artificial leather according to claim 2, characterized in that: The artificial leather layer comprises, by weight: 100 parts of vinyl polyolefin elastomer, 0.1-3 parts of crosslinking agent, 0.1-3 parts of auxiliary crosslinking agent, 0.1-2 parts of coupling agent, 0.1-2 parts of light stabilizer and 0.1-2 parts of antioxidant.

7. The artificial leather according to claim 6, characterized in that: The melt index of the vinyl polyolefin elastomer is 1-14 g / 10 min.

8. A method for preparing artificial leather based on vinyl polyolefin elastomer as claimed in any one of claims 1 to 7, characterized in that: The preparation method comprises: The vinyl polyolefin elastomer, the cross-linking agent, the auxiliary cross-linking agent and the coupling agent are uniformly mixed to obtain a mixed material; The mixed material is cast into a film to obtain an artificial leather layer; After coating the base fabric with an adhesive to form an adhesive layer, the artificial leather layer is covered on the adhesive layer, and vacuum lamination is performed to obtain the artificial leather.

9. The preparation method according to claim 8, characterized in that: The temperature of the film-casting process is 80-100°C.

10. The preparation method according to claim 8, characterized in that: The temperature of the vacuum lamination is 120-150°C.

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