A recyclable single-component polyester ecological foot pad and preparation method thereof

Abstract

The present invention relates to the technical field of automotive carpet materials, and in particular to a recyclable single-component polyester ecological foot pad and a preparation method thereof, wherein the foot pad comprises at least a seven-layer structure, wherein the first layer is PET yarn made of recycled PET material, the second layer is PET non-woven base fabric, the PET yarn of the first layer is fixed on the PET non-woven base fabric of the second layer by a tufting process, the third layer is PET latex, the fourth layer is PET polyester powder, the fifth layer is a PET non-woven fabric intermediate layer, the sixth layer is PET polyester powder, and the seventh layer is a staple needle-punched non-woven fabric or a flamed bottom. The recyclable single-component polyester ecological foot pad of the present invention has only PET as its main component, has a single component, is very convenient for recycling and reuse, reduces the processing pressure of old foot pad waste, and is more environmentally friendly.

Description

Technical Field

[0001] The invention relates to a recyclable single-component polyester ecological foot pad and a preparation method thereof, belonging to the technical field of automobile carpet materials. Background Art

[0002] With the gradual advancement of global carbon neutrality and the introduction of the concept of recycling sustainable recycled materials, the field of automotive soft interior materials and parts also needs to use recycled materials as much as possible to reduce industrial and consumer waste, reduce carbon emissions as much as possible, and at the same time, the performance of the product must meet the performance requirements of various OEMs. Due to the large number of components in the current automotive floor mat materials, it is impossible to effectively strip off the various material components, which has become a technical bottleneck in the recycling of automotive floor mat materials and brought technical challenges to automotive interior materials. It is necessary to gradually realize the recycling of the overall floor mat materials from the construction of floor mat material components, the improvement of material performance, process technology innovation to the innovation of floor mat recycling technology, so as to better match the current recyclable sustainable development strategy requirements.

[0003] Conventional car floor mats are divided into suede layer, middle layer and bottom interlayer structure. The suede layer conventionally uses PA BCF filament fiber, and the middle layer uses PET polyester material, SBR styrene-butadiene rubber or other glues, polyethylene and other material components. Among them, due to the high requirements of BCF spinning process technology on raw materials, virgin PA and other materials are conventionally used to spin the suede layer. At the same time, the overall interlayer structure materials are basically virgin materials. After processing through various processes of the floor mats, many materials are integrated into one, and the interlayer materials cannot be effectively separated. The produced floor mats cannot be recycled and can only be discarded after use by consumers.

[0004] For example, Chinese patent application CN116442598A discloses a stain-resistant and wear-resistant car floor mat, which comprises the following process: step 1, mixing waterborne polyurethane, styrene-acrylamide emulsion, and emulsifier as film-forming agents, adding cross-linking agents and leveling agents to obtain a coating; applying the coating to the surface of leather, and drying the coating to obtain a surface coating; step 2, preparation of the floor mat: taking a base fabric, and sequentially stacking a buffer layer and a leather composite to obtain the floor mat. Chinese patent CN220500559U discloses a multifunctional vehicle foot mat, comprising an anti-skid layer, the surface of the anti-skid layer is provided with air holes, the surface of the anti-skid layer is fixedly connected with anti-skid protrusions, the surface of the anti-skid layer is fixedly connected with a softening layer, the surface of the softening layer is fixedly connected with an adsorption layer, the surface of the adsorption layer is fixedly connected with a bottom layer, the surface of the bottom layer is provided with air holes, the surface of the bottom layer is fixedly connected with an outer layer, the softening layer comprises a polytetrafluoroethylene layer, the surface of the polytetrafluoroethylene layer is fixedly connected with a sponge layer, the surface of the sponge layer is fixedly connected with a linen cotton layer, the adsorption layer comprises a bamboo charcoal fiber layer, and the surface of the bamboo charcoal fiber layer is fixedly connected with a silica gel layer. Chinese patent application CN116476714A discloses a degradable polylactic acid car mat, comprising a mat body, the mat body comprising a polylactic acid fiber surface layer, a first polylactic acid fiber layer dispersed with sodium ions, a polylactic acid plastic film layer, a second polylactic acid fiber layer dispersed with chloride ions, and a polylactic acid resin bottom layer; the first polylactic acid fiber layer is prepared by mixing and dispersing sodium salt, a second porous filler carrier, bamboo fiber, sodium alginate, and solid powder of a processing aid with water-absorbent fiber, and then preparing a mixed slurry, and then adopting wet forming technology to paper-make, and then adopting press and drying to obtain; the second polylactic acid fiber layer is prepared by mixing and dispersing chloride salt, a second porous filler carrier, bamboo fiber, sodium alginate, and solid powder of a processing aid with water-absorbent fiber, and then preparing a mixed slurry, and then adopting wet forming technology to paper-make, and then adopting press and drying to obtain. It can be seen from this that the components of each layer of these existing car mats are relatively complex, and it is difficult to achieve repeated recycling. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a recyclable single-component polyester ecological foot pad and a preparation method thereof. The foot pad has a single component composition and can be recycled and reused.

[0006] The technical solution of the present invention to solve the above technical problems is as follows: a recyclable single-component polyester ecological foot pad, the foot pad includes at least a seven-layer structure, wherein the first layer is PET yarn made of recycled PET material, the second layer is PET non-woven base fabric, the PET yarn of the first layer is fixed on the PET non-woven base fabric of the second layer through a tufting process, the third layer is PET latex, the fourth layer is PET polyester powder, the fifth layer is a PET non-woven fabric middle layer, the sixth layer is PET polyester powder, and the seventh layer is a staple needle-punched non-woven fabric or a flame-burned bottom.

[0007] Furthermore, the gram weight range of the first layer is 200g / m²-2500g / m²; the gram weight range of the second layer is 80g / m²-140g / m²; the gram weight range of the third layer is 20g / m²-150g / m²; the gram weight range of the fourth layer is 10g / m²-500g / m²; the gram weight range of the fifth layer is 30g / m²-1000g / m²; the gram weight range of the sixth layer is 10g / m²-500g / m²; the gram weight range of the seventh layer is 30 g / m²-1800g / m².

[0008] Furthermore, the preparation method of the PET yarn in the first layer is: using food-grade polyester consumer product waste and the like as raw materials, forming 3A-grade polyester sheets after cleaning and crushing, and then obtaining PET spinning-grade chips through melt re-granulation, and the PET spinning-grade chips are formed into PET yarn through melt extrusion, spinning, bundling and oiling, drawing, puffing and deformation, cooling and shaping, networking, and winding and doffing.

[0009] Furthermore, the viscosity of the PET spinning-grade chips is 0.8±0.1 dL / g, the ash content is ≤0.8%, the density is 1.4±0.01 g / cubic centimeter, and the melting point is 248±2°C.

[0010] Further, the drawing process includes two-stage drawing: the first-stage drawing temperature is 80-120° C., and the first-stage drawing ratio is 1.05-1.3; the second-stage drawing temperature is 90-150° C., and the second-stage drawing ratio is 2.5-4.5;

[0011] The expansion deformation temperature is 150-220° C., and the expansion pressure is 6-9 bar.

[0012] Furthermore, the PET latex is prepared by adding a dispersant to PET glue to make its solid content 25-28%;

[0013] The third layer of PET latex is coated on the back of the second layer of PET tufted carpet embryo. During the coating process, the PET latex is foamed to slow down the penetration speed of the PET latex. The amount of foaming agent added to the PET latex is 0.5%-3%. The third layer is obtained after the PET latex is dried, and the drying temperature is 130-190°C.

[0014] Furthermore, the melting point of the PET polyester powder does not exceed 150° C.; and the fourth layer and the sixth layer are prepared by a powder sprinkling process.

[0015] Furthermore, the middle layer of the PET non-woven fabric of the fifth layer is a staple needle-punched non-woven fabric, and the preparation method of the fifth and seventh layers of the staple needle-punched non-woven fabric is: the waste foot pads or scraps are disassembled, cut, and cleaned, and then re-granulated, and then the staple needle-punched non-woven fabric is obtained through melt spinning, bundling and oiling, curling and shaping, cutting short lines and compressing and packaging, needle punching and combing, and heat setting.

[0016] Furthermore, the preparation method of the burnt bottom is: using a high temperature of 600-800°C to burn the surface layer of the staple needle-punched non-woven fabric, so that the surface fibers are sintered and curled to form irregular protrusions, becoming rough and having anti-slip properties, which is the burnt bottom.

[0017] The present invention also discloses a method for preparing a recyclable single-component polyester ecological foot pad, the preparation method comprising:

[0018] The PET yarn of the first layer is fixed on the PET non-woven base fabric of the second layer through a tufting process, and PET latex is coated on the back of the PET tufted blanket embryo of the second layer. During the coating process, the PET latex is foamed to slow down the penetration speed of the PET latex, and then dried to obtain the third layer; the fifth layer is a PET non-woven fabric middle layer, PET polyester powder is sprinkled between the third layer and the fifth layer through a powdering process, and the fourth layer is formed by heating, melting, and cold pressing to bond the third layer and the fifth layer; the seventh layer is a staple needle-punched non-woven fabric or a flamed base, PET polyester powder is sprinkled between the fifth layer and the seventh layer through a powdering process, and the sixth layer is formed by heating, melting, and cold pressing to bond the fifth layer and the seventh layer;

[0019] Then, the foot pad is cut according to shape requirements, and is edged with a PET edge strip or edge line and installed with a PET buckle to obtain the foot pad.

[0020] The beneficial effects of the present invention are:

[0021] The recyclable single-component polyester ecological foot pad of the present invention has only PET as a main component, has a single component, is very convenient for recycling and reuse, reduces the processing pressure of old foot pad waste, and is more beneficial to environmental protection.

[0022] The first layer of the recyclable single-component polyester ecological mat of the present invention can directly use food-grade polyester consumer product waste (mineral water bottles) as raw materials, realizing the secondary utilization of waste materials, and at the same time being used for high-end car mats to maximize value. By using recycled PET materials and controlling appropriate spinning conditions, the PET yarn has good resilience and wear resistance, thereby ensuring the surface quality of the tufted carpet. The present invention uses a tufting process to weave PET yarn on a PET non-woven base cloth to form clusters of short fluff, which is beneficial to increase its softness and comfort, and has higher production efficiency than other machine-made carpet processes (warp knitting, Wilton, Axmin looms).

[0023] In the preparation process of the foot pad of the present invention, after the tufted carpet forms a preliminary carpet embryo, a latex foaming and scraping process is adopted to realize PET latex coating on the back of the PET tufted carpet embryo, and the PET emulsion penetrates into the bonding part of the yarn and the base cloth with water. After baking, while the water evaporates, the PET self-crosslinks to fix the second layer of the PET non-woven base cloth and the first layer of the PET yarn together, which plays a good tufting and locking ability, and the single fluff extraction force is not less than 25N. Conventional PET glue is easy to penetrate and penetrate, resulting in poor appearance and scrapping of the foot pad product. The PET latex used in the present invention is increased to 25-28% by adding a dispersion, and the viscosity of the glue is improved (increased to 80MPA.S). At the same time, the PET latex is foamed during use to slow down its penetration speed, so that the glue can penetrate into the non-woven base cloth layer but is not easy to pass through the non-woven base cloth to the carpet surface layer; and the PET latex is a high glass transition temperature sol, and the fluff extraction force is good. The glass transition temperature of PET latex is 45-50℃. At room temperature, it is in a glassy state with high hardness and high strength to fix the fluff, so its fluff extraction force is better. In addition, since the main material in the foot pad is PET, the use of PET latex has better similar solubility and strong overall adhesion. The glass transition temperature is high and the adhesion is relatively high.

[0024] In the preparation process of the foot pad of the present invention, after the tufting process and the gluing process are completed, a powdered PET material is used to bond the upper tufted carpet material and the lower bottom material. The original PE polyethylene and other adhesive materials are replaced, ensuring the same single-component PET polyester material as the suede fiber. The PET powder used has a low melting point, which makes the processability of the foot pad better. In addition, the use of PET powder to achieve the bonding of the middle layer of the PET non-woven fabric has an acoustic sound absorption effect. The use of PET powder instead of conventional adhesive materials is conducive to reducing the overall warping of the foot pad, improving the flatness of the foot pad, and the overall hardness of the product is relatively uniform and moderate.

[0025] In the preparation process of the foot pad of the present invention, a PET non-woven fabric middle layer is used as the fifth layer. Adding this layer structure can increase the resilience and thickness of the foot pad, while increasing the sound insulation and sound absorption effect. The short-fiber needle-punched non-woven fabric used in the fifth and seventh layers can be converted into the foot pad material again after the end use of the foot pad, ensuring the same single-component PET polyester material as the suede fiber. In addition, after putting in the recycled material, first, the overall plugging hole can be realized; second, the stiffness of the entire foot pad can be increased; third, the entire foot pad will have better elasticity when bent, improving safety performance.

[0026] The bottom layer of the recyclable single-component polyester ecological foot pad of the present invention adopts a sintered bottom, which can achieve a good anti-slip effect. On the one hand, the PET material has a certain hardness, and on the other hand, the sintered bottom can increase its friction coefficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the foot pad of the present invention;

[0028] Figure 2 A manufacturing process flow chart for the fifth and seventh layer materials;

[0029] Figure 3 This is the overall manufacturing process flow chart of the foot pad. DETAILED DESCRIPTION

[0030] The specific implementation of the present invention is described in detail below. The present invention can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used are only for describing specific embodiments and are not intended to limit the present invention.

[0032] like Figure 1 As shown, a recyclable single-component polyester ecological foot mat comprises at least a seven-layer structure, wherein the first layer is PET yarn made of recycled PET material, the second layer is PET non-woven base fabric, the PET yarn of the first layer is fixed on the PET non-woven base fabric of the second layer by a tufting process, the third layer is PET latex, the fourth layer is PET polyester powder, the fifth layer is a PET non-woven fabric middle layer, the sixth layer is PET polyester powder, and the seventh layer is a staple needle-punched non-woven fabric or a flame-burned bottom.

[0033] Specifically, the gram weight range of the first layer is 200g / m²-2500g / m²; the gram weight range of the second layer is 80g / m²-140g / m²; the gram weight range of the third layer is 20g / m²-150g / m²; the gram weight range of the fourth layer is 10g / m²-500g / m²; the gram weight range of the fifth layer is 30g / m²-1000g / m²; the gram weight range of the sixth layer is 10g / m²-500g / m²; the gram weight range of the seventh layer is 30 g / m²-1800g / m².

[0034] Specifically, the preparation method of the PET yarn in the first layer is: using food-grade polyester consumer product waste (such as mineral water bottles) as raw materials, selecting, cleaning and crushing to form 3A-grade polyester sheets (water content ≤2%, impurities ≤30PPM), and then melt-regranulating to obtain PET spinning-grade chips (using screw melt regranulation technology, negative pressure purification homopolymerization technology is used to further extract and remove other small molecule impurities), and the PET spinning-grade chips are formed into PET yarns through melt extrusion, spinning, bundling and oiling, drawing, puffing and deformation, cooling and shaping, networking, and winding and doffing.

[0035] Specifically, the PET spinning-grade chips have a viscosity of 0.8±0.1 dL / g, an ash content of ≤0.8%, a density of 1.4±0.01 g / cubic centimeter, and a melting point of 248±2°C.

[0036] More specifically, the specific process of preparing PET yarn from PET spinning-grade chips is as follows:

[0037] (1) Melt extrusion: PET spinning-grade chips are extruded in a screw extruder at 270-310°C to melt into a molten spinning melt;

[0038] (2) Spinning: The spinning melt of step (1) is conveyed to a spinning manifold through a metering pump at a pressure of 90-150 bar, and the spinning melt passes through fine holes of a Y-shaped spinneret in the spinning manifold to form continuous filaments; the continuous filaments pass through a vertical downward channel and are cooled by a constant temperature and humidity side-blown air to form solidified filaments, wherein the side-blown air temperature is 17-24° C., the relative humidity is 70-90%, and the side-blown air speed is 0.3-0.7 m / s;

[0039] (3) Oiling: The filaments solidified in step (2) are put into an oiling device for oiling, and the oiling rate is controlled at 0.5-1.5%;

[0040] (4) Drawing: The filaments that have been oiled in step (3) are passed through a primary drawing guide roller for primary drawing. The temperature of the primary drawing guide roller is 80-120° C., and the primary drawing ratio is 1.05-1.3.

[0041] Then enter the secondary drafting guide roller for secondary drafting. The temperature of the secondary drafting guide roller is 90-150℃, and the secondary drafting ratio is 2.5-4.5;

[0042] (5) Puffing: After being drawn, the filaments enter the puffing deformation box for puffing treatment. The filaments are fixed, piled and deformed in the puffing box to form puffed yarns, i.e. bulked yarn PET-BCF. The puffing temperature in the puffing deformation box is controlled at 150-220°C and the puffing pressure is 6-9bar.

[0043] (6) Cooling: The bulked yarn PET-BCF of step (5) is put into a cooling drum for cooling, the speed of the cooling drum is 25-50 r / min, and the suction negative pressure is 3-6 KPa;

[0044] (7) Network knotting: The cooled bulked yarn PET-BCF is introduced into the network box by the guide roller, and the bulked yarn BCF is knotted by the high-pressure gas in the box, and the gas pressure is 3-7 bar;

[0045] (8) Winding: The bulked yarn PET-BCF knotted in step (7) is introduced into the winding machine again by the guide roller and wound into a cylindrical yarn tube.

[0046] In step (1), the temperature of the screw extruder is divided into seven heating zones, and the temperature of the first zone at the inlet is 5-15°C lower than the temperatures of the other six zones.

[0047] In step (4), the speed of the primary drafting guide roller is 800-1500 m / min; the speed of the secondary drafting guide roller is 2000-3500 m / min.

[0048] In step (7), the guide roller speed is 2000-2800 m / min.

[0049] In step (8), the guide roller speed is 2000-3000 m / min, the winding machine speed is 2300-3500 m / min, and the winding tension is 150-250 cN.

[0050] The control of the conditions of the drafting process and the bulking deformation process is more conducive to obtaining yarn with better resilience. Preferably, as the drafting ratio increases, the drafting temperature also increases synchronously, thereby ensuring that the yarn is heated for a sufficient time, the movement of the molecular chains inside the yarn is accelerated, and the yarn is better drafted and deformed, thereby obtaining yarn with better resilience.

[0051] Furthermore, the PET latex is prepared by adding a dispersant to the PET glue to make its solid content 25-28%, thereby improving the viscosity of the glue (increased to 80 MPA.S).

[0052] The third layer of PET latex is coated on the back of the second layer of PET tufted carpet embryo. During the coating process, the PET latex is foamed to slow down the penetration rate of the PET latex. The amount of foaming agent added to the PET latex is 0.5%-3% of the weight of the PET latex. The third layer is obtained after the PET latex is dried. The drying temperature is 130-190°C. At this drying temperature, while the water evaporates, the PET latex undergoes self-crosslinking to fix the PET non-woven fabric and the PET yarn together, which has a good tufting and velvet locking ability, and the single velvet extraction force can reach more than 25N. If the drying temperature is too high, the elasticity and viscosity of the PET latex will be damaged.

[0053] More specifically, the main components of the dispersant are silicone and polyether. The dispersant used in the embodiment of the present invention is: polyether F-38 and hydroxy silicone oil JPH208 (wherein the mass ratio of polyether F-38 to hydroxy silicone oil JPH208 is 2:1).

[0054] More specifically, the foaming agent used in the embodiment of the present invention is sodium α-olefin sulfonate. The foaming agent and gas are input and the physical screw is rotated to achieve foaming. The amount of the foaming agent added is 0.5%-3%. Too much foaming agent will reduce the foam ratio, which may easily lead to insufficient weight and penetration of the PET latex, thereby reducing the extraction force of the PET yarn fluff of the foot pad.

[0055] Specifically, the melting point of the PET polyester powder does not exceed 150°C; the fourth layer and the sixth layer are prepared by a powdering process, that is, hot-melt powder is evenly sprinkled on the carpet surface by a powdering device, and then the powder is melted by heating in an oven and bonded to another layer of carpet, and then the two layers of carpet are laminated together by a cooling roller.

[0056] Conventional PET polyester powder has a melting point of about 260° C., which is relatively high and cannot be used for processing foot pads. The present invention modifies the PET polyester powder so that the melting point of the PET polyester powder is reduced to below 150° C., thereby improving the processability of the foot pad.

[0057] In the embodiment of the present invention, the modification method of PET polyester powder is as follows: the raw materials used in the preparation of conventional PET are terephthalic acid and ethylene glycol. When preparing PET polyester powder in the present invention, 1,4-butanediol and acrylic acid need to be added, wherein the total molar number of terephthalic acid and acrylic acid is the same as the total molar number of ethylene glycol and 1,4-butanediol, and the molar ratio of terephthalic acid and acrylic acid is 7:3; the molar ratio of ethylene glycol and 1,4-butanediol is 8:2. During the preparation process, the reaction is first carried out at 230°C for 4 hours, and then at 280°C for 4 hours, and finally after drying and crushing, the modified PET polyester powder is obtained. The melting point of the PET polyester powder is 130°C-150°C, and the intrinsic viscosity is 0.75-0.79dL / g. The modification method regularizes the molecular chain of PET by adding some monomers, thereby lowering the melting point while still maintaining good viscosity. If the addition ratio of 1,4-butanediol and acrylic acid is not appropriate, the melting point of the PET polyester powder will remain relatively high, or the viscosity of the PET polyester powder will decrease, ultimately affecting the application effect.

[0058] Specifically, the PET non-woven fabric middle layer of the fifth layer is a staple needle-punched non-woven fabric, and the preparation method of the fifth and seventh layers of the staple needle-punched non-woven fabric is as follows: dismantling, cutting, and cleaning the waste foot pads or scraps, re-granulating (temperature is 280°C), and then melt spinning (temperature is 280°C), bundling and oiling, curling and shaping (temperature is 100°C), cutting short lines and compressing and packaging, needle punching and combing (400 needle density), and heat setting (temperature is 170°C) to obtain the staple needle-punched non-woven fabric, such as Figure 2 shown.

[0059] Specifically, the preparation method of the burnt bottom is: using a high temperature of 600-800°C to burn the surface layer of the staple needle-punched non-woven fabric, so that the surface fibers are sintered and curled to form irregular protrusions, becoming rough and having anti-slip properties, which is the burnt bottom.

[0060] A method for preparing a recyclable single-component polyester ecological foot pad, the preparation method comprising:

[0061] The PET yarn of the first layer is fixed on the PET non-woven base fabric of the second layer through a tufting process (the tufted carpet blank with different tufting spacings such as 1 / 8, 1 / 10 and 5 / 64 can be designed to achieve different styles of tufted carpet surface styles), and PET latex is coated on the back of the PET tufted carpet blank of the second layer. During the coating process, the PET latex is foamed to slow down the penetration speed of the PET latex, and then dried to obtain the third layer; the fifth layer is a PET non-woven fabric middle layer, PET polyester powder is sprinkled between the third and fifth layers through a powdering process, and the fourth layer is formed by heating, melting, and cold pressing to bond the third and fifth layers; the seventh layer is a staple needle-punched non-woven fabric or a flamed bottom, PET polyester powder is sprinkled between the fifth and seventh layers through a powdering process, and the sixth layer is formed by heating, melting, and cold pressing to bond the fifth and seventh layers;

[0062] Then, the foot pad is cut according to the shape requirements, and the PET edge strip or edge line is used for edge binding and the PET buckle is installed to obtain the foot pad. The process involved in the preparation method is as follows: Figure 3 shown.

[0063] Example 1

[0064] Preparation of a recyclable single-component polyester ecological foot pad:

[0065] The PET yarn of the first layer is fixed on the PET non-woven base fabric of the second layer through a tufting process, and PET latex is coated on the back of the PET tufted carpet embryo of the second layer. During the coating process, the PET latex is foamed to slow down the penetration speed of the PET latex, and then the third layer is obtained by drying; the fifth layer is a PET non-woven fabric middle layer, PET polyester powder is sprinkled between the third and fifth layers through a powdering process, and the fourth layer is formed by heating, melting, and cold pressing to bond the third and fifth layers; the seventh layer is a staple needle-punched non-woven fabric or a flamed bottom, PET polyester powder is sprinkled between the fifth and seventh layers through a powdering process, and the sixth layer is formed by heating, melting, and cold pressing to bond the fifth and seventh layers; then it is cut according to shape requirements, and the foot pad is obtained by using a PET hemming strip or an hemming line for hemming and a PET buckle for installation.

[0066] The first layer is PET yarn made of recycled PET material, the second layer is PET non-woven base fabric, and the PET yarn of the first layer is fixed on the PET non-woven base fabric of the second layer through tufting process. The third layer is PET latex, the fourth layer is PET polyester powder, the fifth layer is the middle layer of PET non-woven fabric, the sixth layer is PET polyester powder, and the seventh layer is the flame-burned bottom of short-fiber needle-punched non-woven fabric.

[0067] The weight of the first layer is 1000 g / m²; the weight of the second layer is 90 g / m²; the weight of the third layer is 80 g / m²; the weight of the fourth layer is 60 g / m²; the weight of the fifth layer is 100 g / m²; the weight of the sixth layer is 200 g / m²; and the weight of the seventh layer is 500 g / m².

[0068] When preparing PET yarn, the primary drawing temperature is 100° C., and the primary drawing ratio is 1.15; the secondary drawing temperature is 120° C., and the secondary drawing ratio is 3.0; the expansion deformation temperature is 200° C., and the expansion pressure is 8 bar.

[0069] The PET latex is prepared by adding a dispersant to PET glue to make its solid content 26%, the amount of foaming agent added to the PET latex is 1.5% of the mass of the PET latex, and the third layer is obtained after the PET latex is dried, and the drying temperature is 150°C.

[0070] Example 2

[0071] Preparation of a recyclable single-component polyester ecological foot pad:

[0072] The PET yarn of the first layer is fixed on the PET non-woven base fabric of the second layer through a tufting process, and PET latex is coated on the back of the PET tufted carpet embryo of the second layer. During the coating process, the PET latex is foamed to slow down the penetration speed of the PET latex, and then the third layer is obtained by drying; the fifth layer is a PET non-woven fabric middle layer, PET polyester powder is sprinkled between the third and fifth layers through a powdering process, and the fourth layer is formed by heating, melting, and cold pressing to bond the third and fifth layers; the seventh layer is a staple needle-punched non-woven fabric or a flamed bottom, PET polyester powder is sprinkled between the fifth and seventh layers through a powdering process, and the sixth layer is formed by heating, melting, and cold pressing to bond the fifth and seventh layers; then it is cut according to shape requirements, and the foot pad is obtained by using a PET hemming strip or an hemming line for hemming and a PET buckle for installation.

[0073] The first layer is PET yarn made of recycled PET material, the second layer is PET non-woven base fabric, and the PET yarn of the first layer is fixed on the PET non-woven base fabric of the second layer through tufting process. The third layer is PET latex, the fourth layer is PET polyester powder, the fifth layer is the middle layer of PET non-woven fabric, the sixth layer is PET polyester powder, and the seventh layer is the flame-burned bottom of short-fiber needle-punched non-woven fabric.

[0074] The weight of the first layer is 200g / m²; the weight of the second layer is 80g / m²; the weight of the third layer is 20g / m²; the weight of the fourth layer is 10g / m²; the weight of the fifth layer is 30g / m²; the weight of the sixth layer is 500g / m²; and the weight of the seventh layer is 1800g / m².

[0075] When preparing PET yarn, the primary drawing temperature is 80°C, and the primary drawing ratio is 1.05; the secondary drawing temperature is 90°C, and the secondary drawing ratio is 2.5; the expansion deformation temperature is 150°C, and the expansion pressure is 6 bar.

[0076] The PET latex is prepared by adding a dispersant to PET glue to make its solid content 25%, the amount of foaming agent added to the PET latex is 0.5% of the mass of the PET latex, and the third layer is obtained after the PET latex is dried, and the drying temperature is 130°C.

[0077] Example 3

[0078] Preparation of a recyclable single-component polyester ecological foot pad:

[0079] The PET yarn of the first layer is fixed on the PET non-woven base fabric of the second layer through a tufting process, and PET latex is coated on the back of the PET tufted carpet embryo of the second layer. During the coating process, the PET latex is foamed to slow down the penetration speed of the PET latex, and then the third layer is obtained by drying; the fifth layer is a PET non-woven fabric middle layer, PET polyester powder is sprinkled between the third and fifth layers through a powdering process, and the fourth layer is formed by heating, melting, and cold pressing to bond the third and fifth layers; the seventh layer is a staple needle-punched non-woven fabric or a flamed bottom, PET polyester powder is sprinkled between the fifth and seventh layers through a powdering process, and the sixth layer is formed by heating, melting, and cold pressing to bond the fifth and seventh layers; then it is cut according to shape requirements, and the foot pad is obtained by using a PET hemming strip or an hemming line for hemming and a PET buckle for installation.

[0080] The first layer is PET yarn made of recycled PET material, the second layer is PET non-woven base fabric, and the PET yarn of the first layer is fixed on the PET non-woven base fabric of the second layer through tufting process. The third layer is PET latex, the fourth layer is PET polyester powder, the fifth layer is the middle layer of PET non-woven fabric, the sixth layer is PET polyester powder, and the seventh layer is the flame-burned bottom of short-fiber needle-punched non-woven fabric.

[0081] The weight of the first layer is 2500g / m²; the weight of the second layer is 140g / m²; the weight of the third layer is 150g / m²; the weight of the fourth layer is 500g / m²; the weight of the fifth layer is 1000g / m²; the weight of the sixth layer is 10g / m²; and the weight of the seventh layer is 30 g / m².

[0082] When preparing PET yarn, the primary drawing temperature is 120°C, and the primary drawing ratio is 1.3; the secondary drawing temperature is 150°C, and the secondary drawing ratio is 4.5; the expansion deformation temperature is 220°C, and the expansion pressure is 9 bar.

[0083] The PET latex is prepared by adding a dispersant to PET glue to make its solid content 28%, the amount of foaming agent added to the PET latex is 3% of the mass of the PET latex, and the third layer is obtained after the PET latex is dried, and the drying temperature is 190°C.

[0084] Example 4

[0085] Preparation of a recyclable single-component polyester ecological foot pad:

[0086] The PET yarn of the first layer is fixed on the PET non-woven base fabric of the second layer through a tufting process, and PET latex is coated on the back of the PET tufted carpet embryo of the second layer. During the coating process, the PET latex is foamed to slow down the penetration speed of the PET latex, and then the third layer is obtained by drying; the fifth layer is a PET non-woven fabric middle layer, PET polyester powder is sprinkled between the third and fifth layers through a powdering process, and the fourth layer is formed by heating, melting, and cold pressing to bond the third and fifth layers; the seventh layer is a staple needle-punched non-woven fabric or a flamed bottom, PET polyester powder is sprinkled between the fifth and seventh layers through a powdering process, and the sixth layer is formed by heating, melting, and cold pressing to bond the fifth and seventh layers; then it is cut according to shape requirements, and the foot pad is obtained by using a PET hemming strip or an hemming line for hemming and a PET buckle for installation.

[0087] The first layer is PET yarn made of recycled PET material, the second layer is PET non-woven base fabric, and the PET yarn of the first layer is fixed on the PET non-woven base fabric of the second layer through tufting process. The third layer is PET latex, the fourth layer is PET polyester powder, the fifth layer is the middle layer of PET non-woven fabric, the sixth layer is PET polyester powder, and the seventh layer is the flame-burned bottom of short-fiber needle-punched non-woven fabric.

[0088] The weight of the first layer is 850g / m²; the weight of the second layer is 100g / m²; the weight of the third layer is 65g / m²; the weight of the fourth layer is 150g / m²; the weight of the fifth layer is 300g / m²; the weight of the sixth layer is 180g / m²; and the weight of the seventh layer is 400 g / m².

[0089] When preparing PET yarn, the primary drawing temperature is 110° C., and the primary drawing ratio is 1.20; the secondary drawing temperature is 130° C., and the secondary drawing ratio is 3.3; the expansion deformation temperature is 210° C., and the expansion pressure is 8 bar.

[0090] The PET latex is prepared by adding a dispersant to PET glue to make its solid content 27%, the amount of foaming agent added to the PET latex is 2.5% of the mass of the PET latex, and the third layer is obtained after the PET latex is dried, and the drying temperature is 160°C.

[0091] Example 5

[0092] Preparation of a recyclable single-component polyester ecological foot pad:

[0093] The PET yarn of the first layer is fixed on the PET non-woven base fabric of the second layer through a tufting process, and PET latex is coated on the back of the PET tufted carpet embryo of the second layer. During the coating process, the PET latex is foamed to slow down the penetration speed of the PET latex, and then the third layer is obtained by drying; the fifth layer is a PET non-woven fabric middle layer, PET polyester powder is sprinkled between the third and fifth layers through a powdering process, and the fourth layer is formed by heating, melting, and cold pressing to bond the third and fifth layers; the seventh layer is a staple needle-punched non-woven fabric or a flamed bottom, PET polyester powder is sprinkled between the fifth and seventh layers through a powdering process, and the sixth layer is formed by heating, melting, and cold pressing to bond the fifth and seventh layers; then it is cut according to shape requirements, and the foot pad is obtained by using a PET hemming strip or an hemming line for hemming and a PET buckle for installation.

[0094] The first layer is PET yarn made of recycled PET material, the second layer is PET non-woven base fabric, and the PET yarn of the first layer is fixed on the PET non-woven base fabric of the second layer through tufting process. The third layer is PET latex, the fourth layer is PET polyester powder, the fifth layer is the middle layer of PET non-woven fabric, the sixth layer is PET polyester powder, and the seventh layer is the flame-burned bottom of short-fiber needle-punched non-woven fabric.

[0095] The weight of the first layer is 2500g / m²; the weight of the second layer is 140g / m²; the weight of the third layer is 150g / m²; the weight of the fourth layer is 500g / m²; the weight of the fifth layer is 1000g / m²; the weight of the sixth layer is 10g / m²; and the weight of the seventh layer is 30 g / m².

[0096] When preparing PET yarn, the primary drawing temperature is 80°C, and the primary drawing ratio is 1.3; the secondary drawing temperature is 90°C, and the secondary drawing ratio is 4.5; the expansion deformation temperature is 220°C, and the expansion pressure is 9 bar.

[0097] The PET latex is prepared by adding a dispersant to PET glue to make its solid content 28%, the amount of foaming agent added to the PET latex is 3% of the mass of the PET latex, and the third layer is obtained after the PET latex is dried, and the drying temperature is 190°C.

[0098] Example 6

[0099] Preparation of a recyclable single-component polyester ecological foot pad:

[0100] The PET yarn of the first layer is fixed on the PET non-woven base fabric of the second layer through a tufting process, and PET latex is coated on the back of the PET tufted carpet embryo of the second layer. During the coating process, the PET latex is foamed to slow down the penetration speed of the PET latex, and then the third layer is obtained by drying; the fifth layer is a PET non-woven fabric middle layer, PET polyester powder is sprinkled between the third and fifth layers through a powdering process, and the fourth layer is formed by heating, melting, and cold pressing to bond the third and fifth layers; the seventh layer is a staple needle-punched non-woven fabric or a flamed bottom, PET polyester powder is sprinkled between the fifth and seventh layers through a powdering process, and the sixth layer is formed by heating, melting, and cold pressing to bond the fifth and seventh layers; then it is cut according to shape requirements, and the foot pad is obtained by using a PET hemming strip or an hemming line for hemming and a PET buckle for installation.

[0101] The first layer is PET yarn made of recycled PET material, the second layer is PET non-woven base fabric, and the PET yarn of the first layer is fixed on the PET non-woven base fabric of the second layer through tufting process. The third layer is PET latex, the fourth layer is PET polyester powder, the fifth layer is the middle layer of PET non-woven fabric, the sixth layer is PET polyester powder, and the seventh layer is the flame-burned bottom of short-fiber needle-punched non-woven fabric.

[0102] The weight of the first layer is 2500g / m²; the weight of the second layer is 140g / m²; the weight of the third layer is 150g / m²; the weight of the fourth layer is 500g / m²; the weight of the fifth layer is 1000g / m²; the weight of the sixth layer is 10g / m²; and the weight of the seventh layer is 30 g / m².

[0103] When preparing PET yarn, the primary drawing temperature is 120°C, and the primary drawing ratio is 1.05; the secondary drawing temperature is 150°C, and the secondary drawing ratio is 2.5; the expansion deformation temperature is 220°C, and the expansion pressure is 9 bar.

[0104] The PET latex is prepared by adding a dispersant to PET glue to make its solid content 28%, the amount of foaming agent added to the PET latex is 3% of the mass of the PET latex, and the third layer is obtained after the PET latex is dried, and the drying temperature is 190°C.

[0105] Comparative Example 1

[0106] The foot pad was prepared by the same method as in Example 1, except that, in this comparative example 1, no foaming agent was added to the PET latex, and the PET latex was not foamed during the coating process.

[0107] The experiment found that PET latex penetrated into the PET yarn on the upper layer of the second layer of PET non-woven fabric, causing adhesion problems of the PET yarn, seriously affecting the appearance of the foot pad and causing the product to be scrapped.

[0108] Comparative Example 2

[0109] The foot pad was prepared by the same method as in Example 1, except that in Comparative Example 2, no dispersant was added to the PET latex, and a foaming agent was directly added to the PET glue for foaming coating.

[0110] The experiment found that if no dispersed glue is added, the solid content of the PET glue is low, and the PET glue can easily penetrate into the PET yarn on the upper layer of the second layer of PET non-woven fabric, causing adhesion problems of the PET yarn.

[0111] Comparative Example 3

[0112] The foot pad was prepared by the same method as in Example 1, except that in this comparative example 3, the foaming agent added to the PET latex was 4% of the mass of the PET latex (higher than the amount of the foaming agent specified in the present invention).

[0113] The experiment found that if the amount of foaming agent added increases, the foam ratio decreases, the PET latex penetration is insufficient, the down locking ability is poor, the down fixing effect is low, and the single down extraction force is less than 12N.

[0114] Comparative Example 4

[0115] The foot pad was prepared by the same method as in Example 1, except that in Comparative Example 4, the amount of dispersant added to the PET latex was increased so that the solid content of the PET latex was 35% (higher than the solid content specified in the present invention).

[0116] The experiment found that if the solid content of PET latex is too high, it will also lead to insufficient penetration of PET latex, poor down locking ability, low down fixing effect, and a single down extraction force lower than 15N.

[0117] Comparative Example 5

[0118] The foot pad was prepared by the same method as in Example 1, except that in this comparative example 5, when preparing the PET yarn, only one stretching was performed, the specific stretching temperature was 110° C., and the stretching ratio was 2.0.

[0119] It was found in the experiment that if only one drafting was used to prepare the PET yarn, the resilience of the pad would decrease and stripe defects would appear on the upper layer of the pad.

[0120] Comparative Example 6

[0121] The foot pad was prepared by the same method as in Example 1, except that in Comparative Example 6, when preparing the PET yarn, the puffing temperature was 140° C. (lower than the puffing temperature specified in the present invention).

[0122] It was found in the experiment that if the puffing temperature is lowered, the rebound performance of the foot pad will decrease.

[0123] Comparative Example 7

[0124] The foot pad was prepared by the same method as in Example 1, except that in Comparative Example 7, when preparing the PET yarn, the puffing temperature was 240° C. (higher than the puffing temperature specified in the present invention).

[0125] The experiment found that if the puffing temperature is too high, the PET yarn is very easy to stick together, which will eventually lead to a decrease in the resilience of the foot pad.

[0126] Comparative Example 8

[0127] The foot pad was prepared by the same method as in Example 1, except that in this comparative example 8, the PET latex was dried to obtain the third layer, and the drying temperature was 200° C. (higher than the drying temperature specified in the present invention).

[0128] The experiment found that if the drying temperature of PET latex is too high, the adhesion of PET latex will deteriorate, and the single-filament extraction force will be below 15N.

[0129] Comparative Example 9

[0130] The foot pad was prepared by the same method as in Example 1, except that, in Comparative Example 9, no PET polyester powder was sprinkled between the third layer and the fifth layer, and the PET non-woven fabric middle layer of the fifth layer was directly bonded by PET latex.

[0131] The experiment found that if there is no PET polyester powder between the third and fifth layers, and only PET latex is used to bond the fifth layer, the bonding performance between the layers in the foot pad will deteriorate and the resilience of the foot pad will be affected.

[0132] Comparative Example 10

[0133] The foot pad was prepared by the same method as in Example 1, except that in Comparative Example 10, the fifth PET non-woven fabric intermediate layer was not provided, and the fourth layer was directly provided between the third layer and the seventh layer.

[0134] The experiment found that if the fifth layer is not provided, the resilience, sound absorption and stiffness of the foot pad will be significantly reduced.

[0135] The performance tests were conducted on the foot pads prepared in the above examples and comparative examples. The specific test methods refer to the standards:

[0136] 1. Tear strength: DIN EN ISO 13937-2;

[0137] 2. Interlayer strength performance: interlayer peeling force DIN 53 357-A;

[0138] 3. Stiffness: Stiffness test VDA 230-209C;

[0139] 4. Resilience: Compression rebound test DIN 54316 (DIN ISO3415);

[0140] 5. Odor: VDA270-C3;

[0141] 6. Taber wear resistance: DIN53109 (1000g load, H18 grinding wheel, Taber weight loss after 2000 cycles);

[0142] 7. Fluff extraction force: QB / T 1090-2001;

[0143] 8. Appearance: Use visual observation and touch to judge, for example, judge the roughness and softness of the pad by touch, observe the flatness of the pad surface with the naked eye, and check whether there are streaks.

[0144] The specific test results are shown in Table 1.

[0145] Table 1 Foot pad performance test data

[0146]

[0147] In addition, the sound insulation effect of the foot pads prepared in the above embodiments and comparative examples was tested. The specific results are shown in Table 2. The sound absorption effect was measured by making the foot pads into large circles with a size of Φ 99.5 mm and small circles with a size of Φ 29 mm. The sound absorption effect was tested in accordance with ISO10534-2: 1998 "Measurement of sound absorption coefficient and acoustic impedance in acoustic impedance tubes Part 2: Transfer function method".

[0148] Table 2 Sound absorption performance of foot pads

[0149]

[0150] It can be seen from the above table data that the foot pads prepared by the preparation method of the present invention in Examples 1-6 have excellent strength performance, resilience, stiffness, sound absorption performance and interlayer strength performance. In particular, in Examples 1-4, when preparing PET yarn, the drawing temperature and the drawing ratio are increased or decreased simultaneously, and the obtained foot pads have better resilience performance. Moreover, when preparing the foot pad, waste mineral water bottles can be directly used for production to realize waste utilization. The entire foot pad is also made of PET material, which is very convenient for recycling and reuse. The foot pad prepared in Example 1 of the present invention is reused as the fifth and seventh layers of the next foot pad preparation, and is recycled 5 times. The prepared foot pads can meet the standard requirements of strength performance, resilience, stiffness, sound absorption performance and interlayer strength performance. It can be seen from this that the foot pads described in the present invention can be well recycled.

[0151] From the experimental comparison of Comparative Example 1, Comparative Example 2 and Example 1, it can be seen that if no dispersant is added to the PET latex or no foaming is performed during coating, the permeability of the PET latex will be too high, resulting in uneven weight of the glue coating, uneven hair extraction force, and adhesion problems of the PET yarn, making it impossible to produce a foot pad with a suitable appearance.

[0152] From the experimental comparison of Comparative Examples 3 and 4 and Example 1, it can be seen that if the amount of dispersant used is too much or the foaming is too much, the velvet fixing effect will be poor and the single velvet extraction force will be low. Therefore, the appropriate amount of dispersant used in PET latex and the appropriate foaming coating are more conducive to achieving better velvet fixing and obtaining a foot pad with good appearance and excellent resilience.

[0153] From the experimental comparison of Comparative Examples 5, 6-7 and Example 1, it can be seen that if the drafting conditions and puffing conditions are not suitable during the preparation of the PET yarn, the resilience of the foot pad will deteriorate, because a large number of yarn tubes (about 500 yarns are required for 1 meter width) are required to be tufted at the same time during the tufting process. The different curling and rebound of any yarn will lead to tension changes and defects such as appearance stripes, and even affect the interlayer strength performance. Therefore, the yarn needs to have higher stability to ensure that the appearance of the tufts after cutting is consistent and meets the requirements of use. The drafting and puffing conditions specified in the present invention are more conducive to obtaining foot pad products with excellent resilience.

[0154] From the experimental comparison between Comparative Example 8 and Example 1, it can be seen that if the drying temperature of PET latex is too high, the adhesion of PET latex will be deteriorated and the single filament extraction force will be reduced. In the preparation method of the present invention, PET emulsion penetrates into the bonding part of PET yarn and base fabric along with water, and while the water evaporates after baking, PET undergoes self-crosslinking at a suitable temperature to fix the base fabric and yarn together, achieving better tufting and velvet locking ability, and the single velvet extraction force can reach more than 25N.

[0155] From the experimental comparison between Comparative Example 9 and Example 1, it can be seen that if there is no PET polyester powder between the third layer and the fifth layer, and only PET latex is used to bond the fifth layer, the bonding performance between the layers in the foot pad will deteriorate and the resilience of the foot pad will be affected. Therefore, the combined use of PET latex and PET polyester powder is more conducive to obtaining a foot pad with excellent performance.

[0156] It can be seen from the experimental comparison between Comparative Example 10 and Example 1 that if the fifth layer is not provided, the resilience, sound absorption and stiffness of the foot pad will be reduced. The layer structure of the foot pad of the present invention can make the foot pad have better performance.

[0157] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are exhaustively listed. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0158] For those skilled in the art, several modifications and improvements may be made without departing from the concept of the present invention, all of which belong to the protection scope of the present invention. The protection scope of the present invention shall be based on the attached claims.

Claims

1. A recyclable single-component polyester ecological foot pad, characterized in that: The foot pad comprises at least a seven-layer structure, wherein the first layer is PET yarn made of recycled PET material, the second layer is PET non-woven fabric, the PET yarn of the first layer is fixed on the PET non-woven fabric of the second layer by tufting process, the third layer is PET latex, the fourth layer is PET polyester powder, the fifth layer is a PET non-woven fabric middle layer, the sixth layer is PET polyester powder, and the seventh layer is a staple needle-punched non-woven fabric or a flamed bottom; The preparation method of the PET yarn in the first layer is: using food-grade polyester consumer product waste as raw material, cleaning and crushing to form 3A-grade polyester sheets, and then melting and re-granulating to obtain PET spinning-grade slices, and the PET spinning-grade slices are melt-extruded, spun, bundled and oiled, drawn, puffed, cooled and shaped, networked, and wound and doffed to form PET yarn; The drawing process includes two-stage drawing: the first-stage drawing temperature is 80-120°C, and the first-stage drawing ratio is 1.05-1.3; the second-stage drawing temperature is 90-150°C, and the second-stage drawing ratio is 2.5-4.5; The expansion deformation temperature is 150-220°C, and the expansion pressure is 6-9 bar; The PET latex is prepared by adding a dispersant to PET glue to make its solid content 25-28%; The third layer of PET latex is coated on the back of the second layer of PET tufted carpet embryo. During the coating process, the PET latex is foamed to slow down the penetration speed of the PET latex. The amount of foaming agent added to the PET latex is 0.5%-3%. The PET latex is dried to obtain the third layer. The drying temperature is 130-190° C. The PET non-woven fabric middle layer of the fifth layer is a staple needle-punched non-woven fabric, and the preparation method of the staple needle-punched non-woven fabric of the fifth and seventh layers is: dismantling, cutting, cleaning, re-granulating the waste foot pads or scraps, and then melt spinning, bundling and oiling, curling and shaping, cutting short lines and compressing and packaging, needle punching and combing, and heat setting to obtain the staple needle-punched non-woven fabric; The preparation method of the fire-burned bottom is: using a high temperature of 600-800° C. to burn the surface layer of the staple needle-punched non-woven fabric, so that the surface fibers are sintered and curled to form irregular protrusions, becoming rough and having anti-slip properties, that is, the fire-burned bottom.

2. The recyclable single-component polyester ecological foot mat according to claim 1, characterized in that: The gram weight range of the first layer is 200g / m²-2500g / m²; the gram weight range of the second layer is 80g / m²-140g / m²; the gram weight range of the third layer is 20g / m²-150g / m²; the gram weight range of the fourth layer is 10g / m²-500g / m²; the gram weight range of the fifth layer is 30g / m²-1000g / m²; the gram weight range of the sixth layer is 10g / m²-500g / m²; the gram weight range of the seventh layer is 30 g / m²-1800g / m².

3. The recyclable single-component polyester ecological foot mat according to claim 1, characterized in that: The PET spinning-grade chips have a viscosity of 0.8±0.1 dL / g, an ash content of ≤0.8%, a density of 1.4±0.01 g / cubic centimeter, and a melting point of 248±2°C.

4. The recyclable single-component polyester ecological foot pad according to claim 1, characterized in that: The melting point of the PET polyester powder does not exceed 150° C. The fourth layer and the sixth layer are prepared by a powder sprinkling process.

5. A method for preparing the recyclable single-component polyester ecological foot pad according to any one of claims 1 to 4, characterized in that: The preparation method is: The PET yarn of the first layer is fixed on the PET non-woven base fabric of the second layer through a tufting process, and PET latex is coated on the back of the PET tufted blanket embryo of the second layer. During the coating process, the PET latex is foamed to slow down the penetration speed of the PET latex, and then dried to obtain the third layer; the fifth layer is a PET non-woven fabric middle layer, PET polyester powder is sprinkled between the third layer and the fifth layer through a powdering process, and the fourth layer is formed by heating, melting, and cold pressing to bond the third layer and the fifth layer; the seventh layer is a staple needle-punched non-woven fabric or a flamed base, PET polyester powder is sprinkled between the fifth layer and the seventh layer through a powdering process, and the sixth layer is formed by heating, melting, and cold pressing to bond the fifth layer and the seventh layer; Then, the foot pad is cut according to shape requirements, and is edged with a PET edge strip or edge line and installed with a PET buckle to obtain the foot pad.

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