A kind of high peel strength TPO composite leather and preparation method thereof

Abstract

The invention discloses a high peel strength TPO composite leather, which comprises a treatment agent layer, a TPO layer and a fabric layer in the thickness direction. The TPO layer comprises the following components in weight percentage: 60-80 parts by weight of EPDM rubber, 10-20 parts by weight of linear low-density polyethylene, 10-20 parts by weight of maleic anhydride modified polypropylene, 0.3-0.5 parts by weight of antioxidant, and 0.3-0.5 parts by weight of ultraviolet light stabilizer. The adjusted high peel strength TPO composite leather can provide a strong bonding force in thickness through the TPO composite leather, can effectively improve the bonding force between the TPO layer and the fabric layer and the treatment agent layer, form effective mechanical adhesion, and can avoid the decline of tensile properties while having high mechanical adhesion.

Description

Technical Field

[0001] The invention relates to the technical field of TPO composite leather, in particular to a high peeling strength TPO composite leather and a preparation method thereof. Background Art

[0002] TPO composite fabric artificial leather is a widely used surface covering material for automotive interiors. Due to its stable structure, easy processing, and convenient cleaning, it is increasingly used in automotive interiors, especially door panels, armrests, and center consoles.

[0003] If the extrusion pressure is too small, TPO is not embedded enough in the fabric and the peeling force is small. If the extrusion pressure is too large, TPO is embedded too much in the fabric, and the peeling force increases, which will affect the tensile properties of the TPO composite fabric artificial leather, making the processing performance of the TPO composite fabric artificial leather worse during the application and coating process, limiting its application in the automotive industry.

[0004] Therefore, there is still a need for a high peel strength TPO composite leather and a preparation method thereof to solve the above problems. Summary of the invention

[0005] The present invention provides a high peeling strength TPO composite leather and a preparation method thereof for solving the above problems.

[0006] The purpose of the present invention is achieved by the following technical solutions:

[0007] A high peel strength TPO composite leather comprises a treatment agent layer, a TPO layer and a fabric layer in sequence in the thickness direction;

[0008] The TPO layer comprises the following components by weight percentage:

[0009] 60-80 parts by weight of EPDM rubber, 10-20 parts by weight of linear low-density polyethylene, 10-20 parts by weight of maleic anhydride modified polypropylene, 0.3-0.5 parts by weight of antioxidant, and 0.3-0.5 parts by weight of ultraviolet light stabilizer.

[0010] In one embodiment, the grafting rate of maleic anhydride modified polypropylene is 0.2-1.0%.

[0011] In one embodiment, the maleic anhydride modified polypropylene has a melt index of 0.5-10 g / 10 min at 190° C. and 2.16 kg.

[0012] In one embodiment, the EPDM rubber has a melt index of 10-20 g / 10 min at 200° C. and 10 kg pressure.

[0013] In one embodiment, the fabric layer has a tensile force of 700-1100N, a static elongation of 50-70%, and a permanent elongation of 70-90%.

[0014] In one embodiment, the component of the treatment agent layer is an aqueous treatment agent.

[0015] In one embodiment, the fabric layer has a tensile force of 700-1100N, a static elongation of 50-70%, and a permanent elongation of 70-90%.

[0016] A method for preparing a high peel strength TPO composite leather as described in any one of the above, characterized by comprising:

[0017] The components for preparing TPO are poured into a mixer for stirring, and then transported to an extruder to obtain a TPO layer of a preset thickness at 180-220°C;

[0018] Conveying the base fabric to the output port of the extruder and compounding it with the TPO to form a first composite leather;

[0019] The surface of the first composite leather is printed with a water-based treatment agent, and then subjected to high-temperature embossing to form a second composite leather.

[0020] Compared with the prior art, the beneficial effects of the present invention include at least:

[0021] The adjusted high peel strength TPO composite leather can provide stronger bonding force in thickness through the TPO composite leather, can effectively improve the bonding force between the TPO layer and the fabric layer and the treatment agent layer, form effective mechanical adhesion, and can avoid the decrease of tensile performance while having high mechanical adhesion. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the structure of the high peel strength TPO composite leather according to an embodiment of the present invention;

[0023] Figure 2 This is the preparation method of the embodiment of the present invention.

[0024] In the figure: 1. treatment agent layer; 2. TPO layer; 3. fabric layer. DETAILED DESCRIPTION

[0025] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make the present invention more comprehensive and complete and to fully convey the concepts of example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their repeated description will be omitted.

[0026] The words expressing positions and directions described in the present invention are all explained with reference to the accompanying drawings as examples, but they can be changed as needed, and all such changes are included in the protection scope of the present invention.

[0027] Reference Figure 1-2 The present invention provides a high peel strength TPO composite leather, which comprises a treatment agent layer 1, a TPO layer 2 and a fabric layer 3 in sequence in the thickness direction. The treatment agent layer 1 is located on the top of the TPO layer 2, and the fabric is located on the bottom of the TPO layer 2.

[0028] The TPO layer 2 comprises the following components by weight percentage:

[0029] 60-80 parts by weight of EPDM rubber, 10-20 parts by weight of linear low-density polyethylene, 10-20 parts by weight of maleic anhydride-modified polypropylene, 0.3-0.5 parts by weight of antioxidant, and 0.3-0.5 parts by weight of ultraviolet light stabilizer. According to experimental tests, the combination of TPO layer 2 and fabric layer 3 or treatment agent layer 1 within this ratio range has higher bonding force and mechanical stress, and has higher tensile properties and higher comfort when used.

[0030] Preferably, the grafting rate of maleic anhydride modified polypropylene is 0.2-1.0%, which can improve the compatibility of polypropylene with other polar materials. A grafting rate in the range of 0.2-1.0% can usually achieve a moderate improvement in compatibility without significantly affecting the basic properties of polypropylene.

[0031] Preferably, the maleic anhydride modified polypropylene has a melt index of 0.5-10 g / 10 min at 190° C. and 2.16 kg. A higher melt index means that the polypropylene has better fluidity during processing, which can reduce processing resistance and improve production efficiency.

[0032] Preferably, the EPDM rubber has a melt index of 10-20 g / 10 min at 200° C. and 10 kg pressure. The EPDM rubber within this range has good fluidity when involved in the preparation. A moderate melt index reduces the risk of mold clogging due to low fluidity during processing, and also avoids unstable dimensional accuracy due to high fluidity.

[0033] Preferably, the tensile force of the fabric layer 3 is 700-1100N, the static elongation is 50-70%, and the permanent elongation is 70-90%. The combined characteristics of the tensile force, static elongation and permanent elongation of the fabric make it have excellent strength, elasticity, durability and adaptability.

[0034] Preferably, the component of the treatment agent layer 1 is an aqueous treatment agent. Aqueous softeners are used to improve the softness, smoothness and feel of fabrics or leather, making them more comfortable and durable.

[0035] A method for preparing the high peel strength TPO composite leather as described in any one of the above, comprising:

[0036] The components used to prepare TPO are poured into a mixer for mixing and then conveyed to an extruder to obtain a TPO layer 2 of a preset thickness at 180-220°C. The above components are first poured into a mixer for mixing and then conveyed to an extruder to output a TPO layer 2 of a constant thickness through a heating module.

[0037] The base fabric is transported to the output port of the extruder and compounded with the TPO to form a first composite leather. The output base fabric and the base fabric are kept in corresponding positions until they are completely cooled, and the first composite leather is formed after they are completely cooled.

[0038] The surface of the first composite leather is printed with a water-based treatment agent, and then embossed at high temperature to form a second composite leather. According to test results, the high peel strength TPO composite leather mixed in the above ratio has high peel strength and high tensile properties.

[0039] Example 1

[0040] TPO extrusion: Pour all raw materials of TPO layer 2 into a buffer tank, and then transport the raw materials to the extruder in proportion through a weighing scale. Set the extruder temperature to 180℃-220℃, adjust the die gap and roller gap, and obtain the TPO layer 2 of the required thickness.

[0041] Skin layer formula, EPDM rubber: linear low-density polyethylene: maleic anhydride modified polypropylene: antioxidant: UV stabilizer = 80:10:10:0.3:0.3 mass ratio;

[0042] Base fabric compounding: The base fabric is transported to the second roller of the extruder through the unwinding device and compounded with the TPO component;

[0043] Printing and embossing: The surface of the semi-finished product obtained in step 2 is printed with a water-based treatment agent, and embossed at high temperature to obtain the desired TPO fabric composite material finished product-1.

[0044] Example 2

[0045] TPO extrusion: Pour all raw materials of TPO layer 2 into a buffer tank, and then transport the raw materials to the extruder in proportion through a weighing scale. Set the extruder temperature to 180℃-220℃, adjust the die gap and roller gap, and obtain the TPO layer 2 of the required thickness.

[0046] Skin layer formula, EPDM rubber: linear low-density polyethylene: maleic anhydride modified polypropylene: antioxidant: UV stabilizer = 70:15:15:0.3:0.4 mass ratio;

[0047] 2.2 Base fabric compounding: The base fabric is transported to the second roller of the extruder through the unwinding device and compounded with the TPO component;

[0048] 2.3 Printing and embossing: The surface of the semi-finished product obtained in step 2 is printed with a water-based treatment agent, and embossed at high temperature to obtain the desired TPO fabric composite material finished product-2.

[0049] Example 3

[0050] TPO extrusion: Pour all raw materials of TPO layer 2 into a buffer tank, and then transport the raw materials to the extruder in proportion through a weighing scale. Set the extruder temperature to 180℃-220℃, adjust the die gap and roller gap, and obtain the TPO layer 2 of the required thickness.

[0051] Skin layer formula, EPDM rubber: linear low-density polyethylene: maleic anhydride modified polypropylene: antioxidant: UV stabilizer = 60:20:20:0.5:0.5 mass ratio;

[0052] Base fabric compounding: The base fabric is transported to the second roller of the extruder through the unwinding device and compounded with the TPO component;

[0053] Printing and embossing: The surface of the semi-finished product obtained in step 2 is printed with a water-based treatment agent, and embossed at high temperature to obtain the desired TPO fabric composite material finished product.

[0054] Example 4

[0055] TPO extrusion: Pour all raw materials of TPO layer 2 into a buffer tank, and then transport the raw materials to the extruder in proportion through a weighing scale. Set the extruder temperature to 180℃-220℃, adjust the die gap and roller gap, and obtain the TPO layer 2 of the required thickness.

[0056] Skin layer formula, EPDM rubber: linear low-density polyethylene: maleic anhydride modified polypropylene: antioxidant: UV stabilizer = 80:15:5:0.3:0.3 mass ratio;

[0057] 4.2 Base fabric compounding: The base fabric is transported to the second roller of the extruder through the unwinding device for compounding with the TPO component;

[0058] 4.3 Printing and embossing: The surface of the semi-finished product obtained in step 2 is printed with a water-based treatment agent, and embossed at high temperature to obtain the desired TPO fabric composite material finished product-4.

[0059] Example 4

[0060] TPO extrusion: Pour all raw materials of TPO layer 2 into a buffer tank, and then transport the raw materials to the extruder in proportion through a weighing scale. Set the extruder temperature to 180℃-220℃, adjust the die gap and roller gap, and obtain the TPO layer 2 of the required thickness.

[0061] Skin layer formula, EPDM rubber: linear low-density polyethylene: maleic anhydride modified polypropylene: antioxidant: UV stabilizer = 60:20:20:0.5:0.5 mass ratio;

[0062] 5.2 Base fabric compounding: The base fabric is transported to the second roller of the extruder through the unwinding device and compounded with the TPO component;

[0063] 5.3 Printing and embossing: The surface of the semi-finished product obtained in step 2 is printed with a water-based treatment agent, and embossed at high temperature to obtain the desired TPO fabric composite material finished product-5.

[0064] Table 1 Experimental results of different proportions of TPO components

[0065]

[0066] From Table 1, we can conclude that:

[0067] Experiments 1, 2, and 3 selected the proportions to be protected in this application, and all properties met the requirements, and products with high peeling force were obtained;

[0068] In Experiment 2, the peeling force was significantly worsened when the amount of maleic anhydride-modified polypropylene was reduced;

[0069] In Experiment 3, the amount of maleic anhydride-modified polypropylene was increased, and the peeling force was improved, but yellowing occurred after irradiation with xenon light.

[0070] Experimental tests have shown that the high peel strength TPO composite leather within the range provided by the present invention has good performance in terms of peel force, static tensile strength and permanent elongation.

[0071] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, substitute and modify the above embodiments within the scope of the invention without departing from the principles and purpose of the present invention. All such changes should fall within the scope of protection of the claims of the present invention.

Claims

1. A high peel strength TPO composite leather, characterized in that: The invention sequentially comprises a treatment agent layer, a TPO layer and a fabric layer in the thickness direction; The TPO layer comprises the following components by weight percentage: 60-80 parts by weight of EPDM rubber, 10-20 parts by weight of linear low-density polyethylene, 10-20 parts by weight of maleic anhydride modified polypropylene, 0.3-0.5 parts by weight of antioxidant, and 0.3-0.5 parts by weight of ultraviolet light stabilizer.

2. The high peel strength TPO layer according to claim 1, characterized in that: The grafting rate of the maleic anhydride modified polypropylene is 0.2-1.0%.

3. The high peel strength TPO layer according to claim 2, characterized in that: The maleic anhydride modified polypropylene has a melt index of 0.5-10 g / 10 min at 190° C. and 2.16 kg.

4. The high peel strength TPO layer according to claim 3, characterized in that: The EPDM rubber has a melt index of 10-20 g / 10 min at 200° C. and 10 kg pressure.

5. The composite leather according to claim 1, characterized in that: The tensile force of the fabric layer is 700-1100N, the static elongation is 50-70%, and the permanent elongation is 70-90%.

6. The composite leather according to claim 1, characterized in that: The component of the treatment agent layer is an aqueous treatment agent.

7. The composite leather according to claim 1, characterized in that: The tensile force of the fabric layer is 700-1100N, the static elongation is 50-70%, and the permanent elongation is 70-90%.

8. A method for preparing the high peel strength TPO composite leather according to any one of claims 1 to 7, characterized in that: include: The components for preparing TPO are poured into a mixer for stirring, and then transported to an extruder to obtain a TPO layer of a preset thickness at 180-220°C; Conveying the base fabric to the output port of the extruder and compounding it with the TPO to form a first composite leather; The surface of the first composite leather is printed with a water-based treatment agent, and then subjected to high-temperature embossing to form a second composite leather.

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