Artificial leather based on vinyl polyolefin elastomer and its preparation method

Abstract

The present invention provides a synthetic leather based on vinyl polyolefin elastomer and a preparation method thereof, belonging to the technical fields of polyolefin and synthetic leather. The synthetic leather based on vinyl polyolefin elastomer comprises: a base fabric, an adhesive layer coated on the base fabric, and a synthetic leather layer covering the adhesive layer. Among them, by weight, the synthetic leather layer comprises: 100 parts of vinyl polyolefin elastomer, 0.01 - 5 parts of crosslinking agent, 0.01 - 5 parts of co-crosslinking agent, 0.01 - 5 parts of coupling agent; wherein, the melt index of the vinyl polyolefin elastomer is 1 - 15 g / 10 min, the number average molecular weight is 100,000 - 800,000, the molecular weight distribution index is 1.0 - 2.0, the melting point is 40°C - 90°C, the degree of branching is 30 - 120 branches / 1000 carbons, and the density is 0.860 - 0.9 g / cm 3 .

Description

Technical Field

[0001] The present invention belongs to the technical fields of polyolefin elastomers and artificial leather, and particularly relates to an artificial leather based on vinyl polyolefin elastomers 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 elastomers and a preparation method thereof, in order to at least partially solve the above technical problems. Thus, the technical solutions provided by the present invention are as follows.

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

[0005] As a second aspect of the present invention, there is provided a preparation method of an artificial leather based on vinyl polyolefin elastomers, comprising: mixing the vinyl polyolefin elastomer, crosslinking agent, co-crosslinking agent, and coupling agent evenly to obtain a mixed material; casting the mixed material into a film to obtain the artificial leather layer; after coating an adhesive on the base fabric to form a bonding layer, covering the artificial leather layer on the bonding layer, and performing vacuum lamination to obtain the artificial leather.

[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 covering the adhesive layer. Among them, vinyl polyolefin elastomer (EPOE) is a thermoplastic elastomer that combines the processability of plastics and the elastic properties of rubber, and has excellent elasticity, impact resistance, aging resistance, and chemical resistance. When used as the material for the artificial leather layer, the prepared artificial leather based on vinyl polyolefin elastomer can become a substitute for traditional PVC and PU artificial leathers 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. Compared with traditional PVC and PU, it has lower emissions of volatile organic compounds (VOCs), better environmental friendliness, and the prepared products are 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, and does not contain organic solvents, and will not cause harm to the human body and the environment, and has good environmental protection characteristics. Detailed Embodiments

[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, does not use toxic and harmful solvents, and will not cause harm to the human body and the environment.

[0008] Specifically, in a first aspect of the present invention, there is provided an artificial leather based on vinyl polyolefin elastomer, including: a base fabric, an adhesive layer coated on the base fabric, and an artificial leather layer covering the adhesive layer. Among them, by weight, the artificial leather layer includes: 100 parts of vinyl polyolefin elastomer, 0.01 - 5 parts of crosslinking agent, 0.01 - 5 parts of co-crosslinking agent, 0.01 - 5 parts of coupling agent; wherein, the melt index of the vinyl polyolefin elastomer is 1 - 15 g / 10 min, the number average molecular weight (M n n) is 100,000 - 800,000, the molecular weight distribution index (PDI = M w w / M n n, M w w is the weight average molecular weight) is 1.0 - 2.0, the melting point is 40°C - 90°C, the degree of branching is 30 - 120 branches / 1000 carbons, and the density is 0.860 - 0.9 g / cm 3 .

[0009] In an embodiment of the present invention, the artificial leather made of vinyl polyolefin elastomer provided by the present invention includes: a base fabric, a bonding layer formed by coating on the base fabric, and an artificial leather layer covering the bonding layer. Vinyl polyolefin elastomer (EPOE) is a thermoplastic elastomer that combines the processability of plastics and the elastic properties of rubber, and has a wide range of melt indices and a relatively high number average molecular weight, making it have excellent elasticity, impact resistance and chemical resistance. When used as a raw material for preparing artificial leather, under the action of a crosslinking agent, a co-crosslinking agent and a coupling agent, the vinyl polyolefin elastomers are connected to each other to form a network structure, which can further improve strength, heat resistance, wear resistance and elasticity, so that the obtained artificial leather also has excellent elasticity, impact resistance and chemical resistance, and at the same time is given the processing convenience of plastics and the elastic properties of rubber, making it possible to be a substitute for traditional PVC and PU artificial leather products. Specifically, EPOE has a wide range of melt indices. The higher the melt index, the better the fluidity of EPOE and the easier the processing, but the mechanical properties of the product may decrease. Therefore, in the production of artificial leather, an appropriate melt index can ensure the fluidity of EPOE during the processing, enabling it to evenly cover the substrate and form a flat surface. EPOE has a low degree of branching and relatively regular molecular chains, which helps to improve its crystallinity and density. Therefore, in the production of artificial leather, a lower degree of branching can make the EPOE molecules arrange more closely, increasing the hardness and wear resistance of the material. A 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. Therefore, in the production of artificial leather, an appropriate density can make the artificial leather have sufficient strength and durability. A relatively high number average molecular weight usually means that the EPOE molecular chains are longer, which will increase the strength and toughness of the material. Therefore, in the production of artificial leather, a relatively high number average molecular weight can make the artificial leather have better tear resistance and durability. Further, it is necessary to select a suitable EPOE raw material according to specific application requirements and optimize these parameters by adjusting the processing conditions to obtain an artificial leather product with excellent performance. In addition, the artificial leather based on vinyl polyolefin elastomer provided by the present invention does not contain plasticizers or other potentially harmful chemical additives, making the prepared artificial leather safer, with lower volatile organic compound emissions and more environmentally friendly.

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

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

[0012] According to an embodiment of the present invention, the cocatalyst used in the synthesis of 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 includes at least one of 0.01-2 parts of a light stabilizer, 0.01-2 parts of an antioxidant, and 0.01-0.05 parts of a pigment. Among them, the light stabilizer is selected from at least one of salicylate esters, benzophenones, benzotriazoles, substituted acrylonitriles, triazines, and hindered amines; the antioxidant is selected from at least one of hindered phenols, p-phenylenediamines, diaryl secondary amines, ketamines, thioethers, phosphites, and phosphates.

[0014] In an embodiment of the present invention, by adding a light stabilizer and / or an antioxidant, the obtained artificial leather has good light aging resistance and heat aging resistance and is not easily faded by light. The artificial leather made of vinyl polyolefin elastomer (EOPE artificial leather) is transparent in color. By adding pigments, the artificial leather has more application scenarios, such as being applied to automotive interiors, sports goods, furniture, fashion, or accessories. The vinyl polyolefin elastomer combines the processability of plastics and the elastic properties of rubber, and different patterns can be hot-pressed on the obtained artificial leather. It should be noted that the pigments are commercially available color pigments or color pigments that can be formulated, and are not specifically limited herein.

[0015] According to an embodiment of the present invention, by weight, the artificial leather layer includes: 100 parts of vinyl polyolefin elastomer, 0.1-3 parts of a crosslinking agent, 0.1-3 parts of a co-crosslinking agent, 0.1-2 parts of a coupling agent, 0.1-2 parts of a light stabilizer, and 0.1-2 parts of an 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, 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 separation of the base fabric and the artificial leather layer. 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. The artificial leather obtained within this range has higher 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 can also be used, which will not be specifically limited here; the adhesive layer is a cured product of at least one of acrylic emulsion, ethylene-vinyl acetate (EVA) emulsion, polyurethane emulsion, and epoxy resin emulsion.

[0019] According to an embodiment of the present invention, the crosslinking agent is a peroxide crosslinking agent. Specifically, the peroxide crosslinking agent is selected from at least one of isopropyl t-butyl peroxycarbonate, 2-ethylhexyl t-butyl peroxycarbonate, 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane, 1,1-bis(tert-butylperoxy)cyclohexane, tert-amyl peroxy(2-ethylhexyl) carbonate, 2,2-bis(tert-butylperoxy)butane, tert-butyl peroxy-3,5,5-trimethylhexanoate, and 1,3-bis(tert-butylperoxyisopropyl)benzene. The crosslinking agent forms covalent bonds or ionic bonds between vinyl polyolefin elastomers, making the linear vinyl polyolefin elastomers form a network structure, thereby enhancing the strength and durability of the artificial leather based on vinyl polyolefin elastomers, making it more tough, and at the same time significantly enhancing its abrasion resistance and peel strength.

[0020] According to an embodiment of the present invention, the co-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 co-crosslinking agent is used to assist the crosslinking agent to promote 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 co-crosslinking agent can also improve the processing performance and physical properties (such as abrasion 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-glycidoxypropyltrimethoxysilane, vinyltrimethoxysilane, 3-aminopropyltriethoxysilane, vinyltriethoxysilane, triisostearoyl titanate isopropyl ester, and isopropyltri(dioctylpyrophosphate acyl oxy) 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, there is also provided a method for preparing artificial leather based on vinyl polyolefin elastomer in the above embodiment, including: uniformly mixing vinyl polyolefin elastomer, crosslinking agent, co-crosslinking agent, and 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 artificial leather through vacuum lamination.

[0023] In the embodiment of the present invention, the process for manufacturing artificial leather based on vinyl polyolefin elastomer is relatively simple, does not contain organic solvents, has low emissions of volatile organic compounds (VOCs), and 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 a high peel strength and good aging resistance. Therefore, due to the lightweight, non-toxicity, and excellent physical properties of the artificial leather based on vinyl polyolefin elastomer, it has become a sustainable alternative to traditional PVC and PU artificial leather materials.

[0024] According to an embodiment of the present invention, the method for preparing artificial leather based on vinyl polyolefin elastomer includes: uniformly mixing at least one of a light stabilizer, an antioxidant, and a pigment with 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; after coating an adhesive on a base fabric to form an adhesive layer, covering the artificial leather layer on the adhesive layer, and obtaining artificial leather through 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 for casting film is 80 - 100 °C; the temperature for vacuum lamination is 120 - 150 °C. Crosslinking will not occur within the temperature range for casting film to ensure that the vinyl polyolefin elastomer undergoes a crosslinking reaction during the lamination process, thereby ensuring the performance of the artificial leather based on the vinyl polyolefin elastomer. During the vacuum lamination process, the binder and the molecules or segments of the adhered surface (vinyl polyolefin elastomer, base fabric) are in continuous thermal motion, causing mutual diffusion or penetration, so that the interface between the binder and the adherend gradually disappears, forming a firmly intertwined 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 for vacuum lamination is 1 - 5 min, preferably 2 min. If the time for vacuum lamination is too short (e.g., <1 min), the base fabric, the adhesive layer, and the artificial leather layer will not be firmly bonded and are prone to delamination during use; if the time for vacuum lamination is too long (>5 min), the preparation cost will increase, and at the same time, it is easy for the binder to penetrate into the artificial leather layer, resulting in a decrease in the flexibility and breathability of the artificial leather of the vinyl polyolefin elastomer and accelerating the aging process of the artificial leather of the vinyl polyolefin elastomer. In addition, the time for vacuum lamination is related to the melt index of the vinyl polyolefin elastomer. Generally, the higher the melt index of the vinyl polyolefin elastomer, the shorter the time for vacuum lamination; the lower the melt index of the vinyl polyolefin elastomer, the longer the time for vacuum lamination.

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

[0028] The performance test method for artificial leather based on vinyl polyolefin elastomer (EPOE) is as follows.

[0029] The crosslinking degree of the artificial leather layer is detected 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 the artificial leather is tested according to method B in the peel test method for soft composite plastic materials of GB8808 - 1988.

[0031] The thermal aging resistance of the artificial leather is detected according to the thermal aging resistance in 6.24 of GB / T4043 - 2010 "Polyvinyl chloride artificial leather for automobiles" to detect the color change and fading level after thermal aging, and the tensile strength of the artificial leather after thermal aging is detected according to 6.5 in this method.

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

[0033] The light fastness grade of artificial leather is in accordance with GB / T8427-2019 Textiles - Tests for colour fastness - Colour fastness to artificial light: Xenon arc, where the test condition is exposure cycle A1.

[0034] Example 1

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

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

[0037] Example 2

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

[0039] Example 3

[0040] Example 3 prepared EPOE artificial leather using the same method as in Example 1. The only difference is that the melt index of the vinyl polyolefin elastomer (EPOE) is 6 g / 10 min, the number-average molecular weight is 220,000, the molecular weight distribution index is 1.9, the melting point is 76 °C, the degree of branching is 75 branches / 1000 carbons, and the density is 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 prepared EPOE artificial leather using the same method as in Example 1. The only difference is that the melt index of the vinyl polyolefin elastomer (EPOE) is 9 g / 10 min, the number-average molecular weight is 180,000, the molecular weight distribution index is 2.0, the melting point is 72 °C, the degree of branching is 108 branches / 1000 carbons, and the density is 0.869 g / cm 3 。The physical property parameters of the EPOE artificial leather prepared in Example 4 are shown in Table 1.

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

[0044] Example 5

[0045] Example 5 prepared EPOE artificial leather using the same method as in Example 1. The only difference is that the melt index of the vinyl polyolefin elastomer (EPOE) is 14 g / 10 min, the number-average molecular weight is 150,000, the molecular weight distribution index is 2.0, the melting point is 63 °C, the degree of branching is 116 branches / 1000 carbons, and the density is 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, successively including 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 non-woven fabric; the adhesive layer is a cured product of EVA emulsion, and the thickness of the adhesive layer is 0.1 mm; by weight, the artificial leather layer includes: 100 parts of polyolefin elastomer (POE) Dow 8450 with a melt index of 3 g / 10 min, 0.7 part of tert-butyl peroxycarbonate-2-ethylhexyl ester (crosslinking agent), 0.5 part of triallyl isocyanurate (co-crosslinking agent), 0.5 part of 3-(methacryloyloxy)propyltrimethoxysilane (coupling agent), 0.1 part of hindered amine light stabilizer UV770, 0.1 part of hindered phenol antioxidant 1076.

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

[0050] Weigh Dow 8450 (POE), crosslinking agent, co-crosslinking agent, coupling agent, light stabilizer, and antioxidant according to the above weight parts and mix them evenly to obtain a mixed material. Cast the obtained mixed material into a film at 100 °C to obtain the artificial leather layer. Subsequently, coat EVA emulsion on the non-woven fabric (base fabric) to form an adhesive layer. Then, cover the prepared artificial leather layer on the adhesive layer and obtain the artificial leather based on polyolefin elastomer (abbreviated as POE artificial leather) after vacuum lamination, wherein the vacuum lamination temperature is 145 °C and the vacuum lamination time is 2 min. 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 the artificial leather based on polyolefin elastomer. The only difference is that the polyolefin elastomer (POE) is Dow 8660 with a melt index of 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 the artificial leather based on polyolefin elastomer. The only difference is that the polyolefin elastomer (POE) is Dow 8669 with a melt index of 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 the POE artificial leather prepared using polyolefin elastomer (POE), the EPOE artificial leather prepared using vinyl polyolefin elastomers (EPOE) with different melt indices in the present invention all have higher peel strength and excellent heat and light aging resistance, and can achieve the performance of traditional artificial leather prepared from PVC or PU. This shows that the EPOE provided by the present invention is expected to replace traditional PVC and PU in the preparation of artificial leather, and at the same time, the preparation process is relatively simple, does not contain organic solvents, and has high environmental friendliness.

[0058] Furthermore, the polyolefin elastomer (POE) is a copolymer of ethylene and α-olefin (such as 1-octene), and its preparation cost is relatively high. The vinyl polyolefin elastomer (EPOE) in the present invention is an ethylene polymer, and the synthesis raw materials are relatively simple and the cost is low. Therefore, the artificial leather based on vinyl polyolefin elastomer prepared in the present invention not only has excellent performance but also has a lower cost. In addition, under the same preparation process conditions, the artificial leather prepared using vinyl polyolefin elastomer in the present invention is softer than that prepared using polyolefin elastomer, and the softness of the artificial leather can be adjusted by controlling the melt index of the vinyl polyolefin elastomer, while the traditional artificial leather prepared using polyolefin elastomer needs to adjust the softness through a post-treatment process, and the process is more complex.

[0059] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An artificial leather based on vinyl polyolefin elastomer, characterized in that, The artificial leather includes: a base fabric, an adhesive layer coated on the base fabric, and an artificial leather layer covering the adhesive layer; Among them, by weight parts, the artificial leather layer includes: 100 parts of vinyl polyolefin elastomer, 0.01 - 5 parts of crosslinking agent, 0.01 - 5 parts of co-crosslinking agent, 0.01 - 5 parts of coupling agent; Among them, 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 degree of branching of 30-120 branches / 1000 carbons, and a density of 0.860-0.9 g / cm 3 ; Among them, the artificial leather based on vinyl polyolefin elastomer is prepared by the following method: Mix the vinyl polyolefin elastomer, crosslinking agent, co-crosslinking agent and coupling agent evenly to obtain a mixed material; the mixed material is cast into a film to obtain the artificial leather layer; After coating an adhesive on the base fabric to form an adhesive layer, cover the artificial leather layer on the adhesive layer, and obtain the artificial leather through vacuum lamination; The temperature of the casting into a film is 80 - 100 °C, the temperature of the vacuum lamination is 120 - 150 °C, and the time of the vacuum lamination is 1 - 5 min.

2. The artificial leather according to claim 1, characterized in that, The artificial leather layer further includes: At least one of 0.01 - 2 parts of light stabilizer, 0.01 - 2 parts of antioxidant, 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, spunlace fabric; The adhesive layer is a cured product of at least one of acrylic emulsion, polyvinyl acetate emulsion, polyurethane emulsion, epoxy resin emulsion; The crosslinking agent is a peroxide crosslinking agent, and the peroxide crosslinking agent is selected from at least one of isopropyl t-butyl peroxycarbonate, 2-ethylhexyl t-butyl peroxycarbonate, 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane, 1,1-bis(tert-butylperoxy)cyclohexane, tert-amyl peroxy(2-ethylhexyl)carbonate, 2,2-bis(tert-butylperoxy)butane, tert-butyl peroxy-3,5,5-trimethylhexanoate, 1,3-bis(tert-butylperoxyisopropyl)benzene; The co-crosslinking agent is selected from at least one of trimethylolpropane triacrylate, propoxylated trimethylolpropane triacrylate, triallyl isocyanurate, trimethylolpropane trimethacrylate, ethoxylated trimethylolpropane triacrylate, trimethallyl isocyanate, pentaerythritol triacrylate; The coupling agent is selected from at least one of 3-(methacryloyloxy)propyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, vinyltrimethoxysilane, 3-aminopropyltriethoxysilane, vinyltriethoxysilane, triisostearoyl titanate isopropyl ester, isopropyl tri(dioctylpyrophosphate acyl) titanate; 5. The artificial leather according to claim 2, characterized in that, The light stabilizer is selected from at least one of salicylate, benzophenone, benzotriazole, substituted acrylonitrile, triazine, hindered amine; The antioxidant is selected from at least one of hindered phenol, p-phenylenediamine, diaryl secondary amine, ketoamine, thioether, phosphite, phosphate.

6. The artificial leather according to claim 2, characterized in that, By weight parts, the artificial leather layer comprises: 100 parts of vinyl polyolefin elastomer, 0.1 - 3 parts of crosslinking agent, 0.1 - 3 parts of co-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.

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