Polyolefin artificial leather, preparation method thereof and automobile seat

Abstract

The invention belongs to the technical field of artificial leather, and particularly relates to polyolefin artificial leather, a preparation method thereof and an automobile seat, the polyolefin artificial leather comprises a base cloth layer, a base material layer and a coating layer which are stacked in sequence; the base material layer is prepared from the following raw material components in parts by mass: 135 to 165 parts of island microstructure master batch, 0.4 to 1 part of assistant crosslinking agent, 0.05 to 0.2 part of coupling agent, 0.01 to 0.2 part of ultraviolet absorbent, 0.01 to 0.2 part of light stabilizer and 0.01 to 0.2 part of anti-aging agent; wherein the sea-island microstructure master batch comprises polyolefin and rubber with double bonds; according to the invention, by improving the addition amount and the addition process of the rubber, double bonds in the rubber are protected while the dispersion performance is improved in the form of the sea-island microstructure master batch, on one hand, the master batch structure can prevent the rubber from hardening and embrittling due to the influence of ultraviolet rays after long-time exposure; on the other hand, the rubber content is limited, so that the crack cracking phenomenon caused by swelling is avoided, and the roughness of the artificial leather does not change after the artificial leather is used for a long time in a high-temperature environment.

Description

Technical Field

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

[0002] Patent document 202110774131.5 discloses a polyolefin artificial leather substrate and artificial leather containing a rubber component with excellent light aging resistance, wherein the artificial leather substrate and artificial leather include a light aging resistant polyolefin layer and a base fabric layer from top to bottom, wherein an appropriate amount of rubber component containing double bonds is added to the light aging resistant polyolefin layer, and a cross-linked structure is formed in a suitable manner to improve the light aging resistance, and a certain amount of ultraviolet absorber, light stabilizer and light shielding agent are added at the same time. The artificial leather substrate and artificial leather, especially the light aging resistance of light-colored leather, can be widely used in the fields of automotive interiors, and the amount of rubber added in the technical solution is 60-100 parts.

[0003] EPDM has low unsaturation and low polarity. According to the principle of like dissolves like, polar solvents easily dissolve polar substances, while non-polar solvents more easily dissolve non-polar substances. When EPDM comes into contact with certain solvents, due to its small size and fast diffusion rate, it preferentially penetrates between EPDM molecules, causing the polymer to swell, and even dissolve the polymer after swelling. In addition, when exposed to ultraviolet light for a long time, EPDM will undergo photo-oxidation reaction, causing the leather surface to crack, harden, or even powder. This is because ultraviolet rays can destroy the unsaturated double bonds in the EPDM molecular chain, triggering free radical reactions, thereby accelerating the aging process.

[0004] The operating temperature of other thermoplastic elastomers such as TPE generally does not exceed 80°C, and they may soften or deform if exposed to high temperature environment for a long time; while SEBS has poor low-temperature performance and low elasticity.

[0005] It should be noted that the above information disclosed in this background technology section is only used to understand the background technology of the present application concept, and therefore, the above description is not considered to constitute information of the prior art. Summary of the invention

[0006] The embodiments of the present disclosure at least provide a polyolefin artificial leather and a preparation method thereof, and a car seat.

[0007] In the first aspect, the embodiments of the present disclosure provide a polyolefin artificial leather, comprising: a base fabric layer, a substrate layer and a coating layer stacked in sequence; the substrate layer comprises the following raw material components in parts by weight: 135-165 parts of sea island microstructure masterbatch, 0.4-1 parts of a co-crosslinking agent, 0.05-0.2 parts of a coupling agent, 0.01-0.2 parts of a UV absorber, 0.01-0.2 parts of a light stabilizer, and 0.01-0.2 parts of an anti-aging agent; wherein the sea island microstructure masterbatch comprises polyolefin and a rubber with double bonds.

[0008] In an optional embodiment, the sea-island microstructure masterbatch comprises the following raw material components in parts by weight: 100 parts of polyolefin and 35-45 parts of EPDM.

[0009] In an optional embodiment, the island-shaped regions obtained from rubber in the sea-island microstructure masterbatch account for 25-50% of the surface area.

[0010] In an optional embodiment, the polyolefin includes any one or more combinations of ethylene and α-olefin copolymers, and propylene and α-olefin copolymers.

[0011] In an optional embodiment, the sea-island microstructure masterbatch further comprises an olefin block copolymer, wherein the olefin block copolymer is obtained by mixing crystallizable ethylene-octene and amorphous ethylene-octene; and the octene content of the olefin block copolymer is 25-40 mol%.

[0012] In an optional embodiment, the sea-island microstructure masterbatch comprises the following raw material components in parts by weight: 100 parts of polyolefin, 35-45 parts of EPDM, and 5-20 parts of olefin block copolymer.

[0013] In an optional embodiment, the thickness of the substrate layer is 0.15-0.6 mm.

[0014] In the second aspect, the embodiment of the present disclosure also provides a method for preparing the polyolefin artificial leather as described above, comprising the following steps: step S1, dispersing polyolefin and rubber through a screw to form a sea-island microstructure masterbatch, the screw aspect ratio is 20-25, the compression ratio is 2:1, and the processing temperature is 140-180°C; step S2, melt-extruding and bonding with the base fabric layer after sufficient stirring according to the ratio, the processing temperature is 120-200°C, and the bonding pressure is 1-10MPa; step S3, corona treatment, the corona power is 2-10KWh, and the line speed is 5-30m / min; step S4, surface coating and embossing to obtain polyolefin artificial leather.

[0015] In an optional embodiment, the step S1 further comprises an olefin block copolymer, and the olefin block copolymer is mixed with the polyolefin to form a sea-island microstructure masterbatch with the rubber.

[0016] In a third aspect, the embodiments of the present disclosure further provide a car seat, comprising the polyolefin artificial leather as described above.

[0017] The beneficial effects of the present invention are that the polyolefin artificial leather and its preparation method, and the automobile seat improve the amount of rubber added and the adding process, and at the same time protect the double bonds in the rubber in the form of a sea-island microstructure masterbatch to enhance the dispersion performance, so that the rubber undergoes a cross-linking reaction with the polyolefin to form a cross-linking structure, thereby enhancing the processing performance; on the one hand, the masterbatch structure can prevent the rubber from becoming hard and brittle due to long-term exposure to ultraviolet rays, and on the other hand, the limitation on the rubber content also avoids cracking due to swelling, thereby effectively enhancing the anti-aging performance and ensuring that the roughness of the artificial leather does not change during long-term use in a high-temperature environment.

[0018] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram of the structure of a polyolefin artificial leather provided in an embodiment of the present disclosure; Figure 2 The surface pattern of the polyolefin artificial leather of Example 3 provided in the embodiments of the present disclosure; Figure 3 This is a surface pattern of the polyolefin artificial leather of Example 7 provided in the embodiments of the present disclosure.

[0022] In the figure: 1. Base fabric layer; 2. Base material layer; 3. Coating layer. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Glossary: EPDM: Ethylene propylene diene monomer rubber, a copolymer of ethylene, propylene and a small amount of non-conjugated diene, is the abbreviation of Ethylene Propylene Diene Monomer.

[0025] TPE: Thermoplastic elastomer, referred to as TPE or TPR, is the abbreviation of Thermoplastic rubber.

[0026] SEBS: A linear triblock copolymer with polystyrene as the terminal segment and ethylene-butene copolymer obtained by hydrogenating polybutadiene as the middle elastic block. It is the abbreviation of Styrene Ethylene Butylene Styrene.

[0027] As used herein, the phrases "in one embodiment," "according to one embodiment," "in some embodiments," and the like generally refer to the fact that the particular feature, structure, or characteristic following the phrase may be included in at least one embodiment of the present disclosure. Therefore, a particular feature, structure, or characteristic may be included in more than one embodiment of the present disclosure, so that these phrases do not necessarily refer to the same embodiment. As used herein, the terms "example," "exemplary," and the like are used to "serve as an example, instance, or illustration." Any implementation, aspect, or design described herein as "example" or "exemplary" is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. On the contrary, the use of the terms "example," "exemplary," and the like is intended to present concepts in a concrete manner.

[0028] Herein, example embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as "at least one of..." modify the entire list of elements when following a list of elements, rather than modifying individual elements in the list. For example, the expression "at least one of a, b, and c" should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0029] The terms used herein are only used to describe specific exemplary configurations and are not intended to be limited. As used herein, the singular articles "one", "an" and "the" may also be intended to include plural forms, unless it is clearly indicated above that this is not the case. The terms "comprise", "include" and "have" are inclusive, and therefore specify the presence of features, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components and / or combinations thereof. The method steps, processes and operations described herein should not be interpreted as necessarily requiring them to be performed in the specific order discussed or shown, unless specifically identified as an execution order. Additional or alternative steps may be adopted.

[0030] The existing patent 202110774131.5 discloses a polyolefin artificial leather substrate and artificial leather containing a rubber component with excellent light aging resistance. The artificial leather substrate and artificial leather include a light aging resistant polyolefin layer and a base fabric layer from top to bottom, wherein an appropriate amount of rubber component containing double bonds is added to the light aging resistant polyolefin layer, and a cross-linked structure is formed in a suitable manner to improve the light aging resistance, and a certain amount of ultraviolet absorber, light stabilizer and light shielding agent are added at the same time. The artificial leather substrate and artificial leather, especially the light aging resistance of light-colored leather, can be widely used in the fields of automotive interiors, etc., and the rubber is 60-100 parts.

[0031] EPDM (ethylene propylene diene monomer copolymer) has low unsaturation and low polarity. According to the principle of like dissolves like, polar solvents easily dissolve polar substances, while non-polar solvents more easily dissolve non-polar substances. When EPDM comes into contact with certain solvents, due to its small size and fast diffusion rate, it preferentially penetrates between EPDM molecules, causing the polymer to swell, and even dissolve the polymer after swelling. In addition, when exposed to ultraviolet rays for a long time, EPDM will undergo photo-oxidation reaction, causing the leather surface to crack, harden, or even powder. This is because ultraviolet rays can destroy the unsaturated double bonds in the EPDM molecular chain, triggering free radical reactions, thereby accelerating the aging process.

[0032] The effects pointed out for the above solutions are all the results obtained by the inventor after practice and careful research. Therefore, the discovery process of the above problems and the solutions proposed by the present disclosure for the above problems below should all be the contributions made by the inventor to the present disclosure during the disclosure process.

[0033] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0034] See also Figure 1 ,like Figure 1As shown, an embodiment of the present disclosure provides a polyolefin artificial leather, comprising: a base fabric layer, a substrate layer and a coating layer stacked in sequence; the substrate layer comprises the following raw material components in parts by weight: 135-165 parts of sea island microstructure masterbatch, 0.4-1 parts of a co-crosslinking agent, 0.05-0.2 parts of a coupling agent, 0.01-0.2 parts of a UV absorber, 0.01-0.2 parts of a light stabilizer, and 0.01-0.2 parts of an anti-aging agent; wherein the sea island microstructure masterbatch comprises polyolefin and a rubber with double bonds.

[0035] In some embodiments, specifically, the sea-island microstructure masterbatch includes the following raw material components in parts by weight: 100 parts of polyolefin and 35-45 parts of EPDM.

[0036] In some embodiments, specifically, the island regions obtained from rubber in the sea-island microstructure masterbatch account for 25-50% of the surface area.

[0037] In some embodiments, specifically, the polyolefin includes any one or more combinations of ethylene and α-olefin copolymers, propylene and α-olefin copolymers.

[0038] In some embodiments, specifically, the island-in-the-sea microstructure masterbatch further comprises an olefin block copolymer, wherein the olefin block copolymer is obtained by mixing crystallizable ethylene-octene and amorphous ethylene-octene; and the octene content of the olefin block copolymer is 25-40 mol%.

[0039] In some embodiments, specifically, the sea-island microstructure masterbatch comprises the following raw material components in parts by weight: 100 parts of polyolefin, 35-45 parts of EPDM, and 5-20 parts of olefin block copolymer.

[0040] In some embodiments, specifically, the thickness of the substrate layer is 0.15-0.6 mm.

[0041] In some embodiments, specifically, the auxiliary cross-linking agent includes any one or more combinations of monofunctional acrylates, difunctional acrylates, trifunctional acrylates and multifunctional acrylates, preferably pentaerythritol triacrylate, pentaerythritol tetraacrylate, ethoxylated pentaerythritol tetraacrylate, propoxylated pentaerythritol tetraacrylate and trimethylolpropane triacrylate.

[0042] In some embodiments, specifically, the coupling agent includes one or a combination of vinyl trimethoxy silane, vinyl tri(β-methoxyethoxy) silane, vinyl triethoxy silane, γ-methacryloxypropyl trimethoxy silane and vinyl triisopropoxy silane.

[0043] In some embodiments, specifically, the anti-aging agent includes one or a combination of antioxidants, thermal stabilizers, and free radical scavengers.

[0044] In some embodiments, specifically, the light stabilizer includes one or a combination of salicylic acid, substituted acrylonitrile, benzophenone, benzotriazole, triazine, inorganic or organic pigment light shielding agent, and hindered amine.

[0045] In some embodiments, specifically, the ultraviolet absorber includes any one of salicylates, benzophenones, benzotriazoles, substituted acrylonitriles, and triazines.

[0046] In some embodiments, specifically, the base fabric layer includes any one or more combinations of wool fabric, plain fabric, polyester fabric, nylon fabric, microfiber base fabric, stretch fabric and non-woven fabric.

[0047] In some embodiments, specifically, the coating layer includes any one of a polyurethane coating, an acrylate coating and a silicone coating; the polyurethane coating includes any one or more combinations of acrylic polyurethane, alkyd polyurethane, polyester polyurethane, polyether polyurethane, epoxy polyurethane and water-based polyurethane; the acrylate coating includes any one or a combination of two of acrylic resin and modified acrylic resin; the silicone coating includes any one or more combinations of anionic, cationic and non-ionic silicone coatings.

[0048] The disclosed embodiment also provides a method for preparing the polyolefin artificial leather as described above, comprising the following steps: step S1, dispersing polyolefin and rubber through a screw to form a sea-island microstructure masterbatch, wherein the screw has an aspect ratio of 20-25, a compression ratio of 2:1, and a processing temperature of 140-180°C; step S2, melt-extruding and laminating with a base fabric layer after sufficient stirring according to the ratio, wherein the processing temperature is 120-200°C, and the laminating pressure is 1-10MPa; step S3, corona treatment, wherein the corona power is 2-10KWh, and the line speed is 5-30m / min; step S4, surface coating and embossing to obtain the polyolefin artificial leather.

[0049] The disclosed embodiment also provides a car seat, comprising the polyolefin artificial leather as described above.

[0050] Example 1 Step S1, polyolefin and rubber are dispersed by a screw to form a sea-island microstructure masterbatch made of 100 parts of polyolefin and 35 parts of EPDM, the screw has an aspect ratio of 20, a compression ratio of 2:1, and a processing temperature of 150°C.

[0051] Step S2, after being fully stirred according to the ratio, the mixture is melt-extruded and bonded to the base fabric layer, the processing temperature is 170° C., and the bonding pressure is 8 MPa.

[0052] Step S3, corona treatment, the corona power is 8 KWh, and the line speed is 25 m / min.

[0053] Step S4: surface coating and embossing to obtain polyolefin artificial leather.

[0054] Specifically, the parameter models of steps S2 and S4 are shown in Table 1 below.

[0055] Table 1

[0056] Specifically, some parameters in Example 1 were changed to obtain the component parameters and performance parameters in Examples 1-7 as shown in Tables 2 and 3.

[0057] Softness: QB / T5155-2017 "Test methods for artificial leather and synthetic leather - Determination of softness".

[0058] Tensile strength and elongation at break: GB / T1040.3-2006 "Determination of tensile properties of plastics Part 3: Test conditions for films and sheets".

[0059] Heat aging resistance: The sample was placed in an oven at 110℃±2℃ for 168h and then the color change grade was evaluated according to GB / T 250-2008.

[0060] UV aging performance: Light temperature 60℃, UV radiation from 280nm to 400nm 15kwh / ㎡, of which UV radiation with a wavelength of 280nm to 320nm accounts for at least 3% and no more than 10%. Discoloration grade evaluation is carried out according to GB / T 250-2008.

[0061] Table 2

[0062] Table 3

[0063] Specifically, comparing the data of Examples 1, 2, and 3, it is shown that after adding olefin block copolymer OBC in Examples 2 and 3, the pattern retention rate is better and the aging effect is good. The "sea" formed by the mixture of olefin block copolymer and polyolefin in the sea-island microstructure can further enhance the anti-aging effect.

[0064] Specifically, by comparing the data of Examples 1, 4, and 5, it is shown that Example 4 has a high EPDM content and good softness, while in Example 5, the amount of EPDM added is greater than 50 parts, the swelling rate is high, and the anti-aging performance is poor.

[0065] Specifically, comparing the data of Examples 2, 6, and 7, it is shown that the OBC in Example 7 is not added with a sea-island structure and has poor tensile strength.

[0066] See also Figure 2 The polyolefin artificial leather provided in Example 3 is a preferred embodiment. In addition to having excellent tensile strength and softness, it also has a very high extreme temperature embossing retention rate. This is because the rubber in the sea-island microstructure masterbatch provides anti-aging properties, and the rubber in the sea-island microstructure does not swell.

[0067] like Figure 3 As shown, the polyolefin artificial leather provided in Example 7 is used as a comparative example. Because its olefin block copolymer is not added to the sea-island microstructure masterbatch, the tensile strength decreases and it cannot form a combination with the sea-island microstructure masterbatch, which leads to a decrease in the embossing retention rate and the surface pattern tends to be flat under extreme temperatures.

[0068] In summary, the polyolefin artificial leather and its preparation method, as well as the automobile seat, improve the amount of rubber added and the adding process, and improve the dispersion performance in the form of a sea-island microstructure masterbatch while protecting the double bonds present in the rubber. On the one hand, the masterbatch structure can prevent the rubber from becoming hard and brittle due to long-term exposure to ultraviolet rays. On the other hand, the limitation on the rubber content also avoids cracking due to swelling, effectively improving the anti-aging performance and ensuring that the roughness of the artificial leather does not change during long-term use in a high-temperature environment.

[0069] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A polyolefin artificial leather, characterized in that: include: A base fabric layer, a substrate layer and a coating layer are sequentially stacked; The substrate layer includes the following raw material components in parts by weight: 135-165 parts of sea island microstructure masterbatch, 0.4-1 parts of co-crosslinking agent, 0.05-0.2 parts of coupling agent, 0.01-0.2 parts of ultraviolet absorber, 0.01-0.2 parts of light stabilizer, 0.01-0.2 parts of anti-aging agent; Wherein, the sea-island microstructure masterbatch comprises polyolefin and rubber with double bonds.

2. The polyolefin artificial leather according to claim 1, characterized in that The sea-island microstructure masterbatch comprises the following raw material components in parts by weight: 100 parts of polyolefin, 35-45 parts of EPDM.

3. The polyolefin artificial leather according to claim 1, characterized in that: The island-shaped regions obtained from rubber in the sea-island microstructure masterbatch account for 25-50% of the surface area.

4. The polyolefin artificial leather according to claim 1, characterized in that: The polyolefin includes any one or more combinations of ethylene and α-olefin copolymers, and propylene and α-olefin copolymers.

5. The polyolefin artificial leather according to claim 1, characterized in that: The island-in-the-sea microstructure masterbatch further comprises an olefin block copolymer, wherein the olefin block copolymer is obtained by mixing crystallizable ethylene-octene and amorphous ethylene-octene; And, the octene content of the olefin block copolymer is 25-40 mol %.

6. The polyolefin artificial leather according to claim 5, characterized in that: The sea-island microstructure masterbatch comprises the following raw material components in parts by weight: 100 parts of polyolefin, 35-45 parts of EPDM, 5-20 parts of olefin block copolymer.

7. The polyolefin artificial leather according to claim 1, characterized in that: The thickness of the substrate layer is 0.15-0.6 mm.

8. A method for preparing a polyolefin artificial leather according to any one of claims 1 to 7, characterized in that: The steps include: Step S1, dispersing polyolefin and rubber through a screw to form a sea-island microstructure masterbatch, wherein the screw has an aspect ratio of 20-25, a compression ratio of 2:1, and a processing temperature of 140-180°C; Step S2, after being fully stirred according to the ratio, melt extruded and laminated with the base fabric layer, the processing temperature is 120-200°C, and the laminating pressure is 1-10MPa; Step S3, corona treatment, the corona power is 2-10KWh, and the line speed is 5-30m / min; Step S4: surface coating and embossing to obtain polyolefin artificial leather.

9. The method for preparing polyolefin artificial leather as claimed in claim 8, characterized in that: The step S1 also includes an olefin block copolymer, which is mixed with polyolefin to form a sea-island microstructure masterbatch with the rubber.

10. A car seat, characterized in that: The invention comprises the polyolefin artificial leather as claimed in any one of claims 1 to 7.

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