Non-PVC (PETG / PET) lightweight mute lock catch floor and preparation method thereof

Abstract

The invention relates to the technical field of floor materials, in particular to a Non-PVC (PETG / PET) lightweight mute lock catch floor and a preparation method thereof. The Non-PVC (PETG / PET) lightweight mute lock catch floor comprises a wear-resistant layer, a color film layer, a base material layer and a ground mat, the base material layer comprises the following raw materials in parts by weight: 30-40 parts of PETG, 60-70 parts of PET, 10-40 parts of a flexibilizer, 1-1.5 parts of a lubricant, 200-300 parts of calcium powder, 3-5 parts of an antioxidant, 1-3 parts of a foaming agent, 1-5 parts of a composite chain extender and 1-2 parts of polyamide; the composite chain extender is formed by mixing tetraepoxypropyl diaminodiphenylmethane and modified mesoporous silica according to the weight ratio of 1: 1. According to the Non-PVC (PETG / PET) light-weight mute lock catch floor, foaming of the base material layer is excellent, the non-PVC (PETG / PET) light-weight mute lock catch floor has the advantages of being low in density, light in weight and good in mechanical performance, the maximum decibel value does not exceed 74 dB when a falling ball experiment test is carried out, and the non-PVC (PETG / PET) light-weight mute lock catch floor has an excellent mute effect.

Description

Technical Field

[0001] The present invention relates to the technical field of floor materials, and particularly to a Non-PVC (PETG / PET) lightweight silent locking floor and a preparation method thereof. Background Art

[0002] Currently, most commonly used floors are made of PVC material. PVC elastic floors cannot be recycled multiple times and also contain halogens. Incineration treatment will produce dioxins that pollute the environment. PET and PETG materials are non-toxic, odorless, and have good hygienic safety. They have excellent mechanical properties and chemical stability, and can be processed through processes such as injection molding, blow molding, and extrusion. The cost is relatively low, and they are an environmentally friendly recyclable material.

[0003] Patent technical literature CN118958623A discloses a flame-retardant and deformation-resistant PETG floor and a preparation method thereof. The floor described in this invention includes a UV coating, a wear-resistant layer, a color film layer, a base material layer, and a silent cushion layer from top to bottom. This invention prepares a flame-retardant and deformation-resistant PETG floor with good flame retardancy, mechanical properties, and deformation resistance by blending PET, PETG, and modified PET and adding a multi-element synergistic flame retardant. Patent technical literature CN116145922A discloses an environmentally friendly, durable, and recyclable floor based on PET / PETG and a preparation method thereof. The floor described in this invention includes a wear-resistant layer, a color film layer, a base material layer, and a silent cushion layer from top to bottom. The floor prepared by this invention is degradable and recyclable, and at the same time, the components do not contain plasticizers and stabilizers. Therefore, the emission of harmful substances during the preparation process is low, and the finished product does not contain heavy metals, formaldehyde, and volatile benzene substances.

[0004] However, in real life, people are often troubled by noise. Therefore, there is an urgent need for a floor that can reduce noise to be applicable to places such as residences or offices, which can isolate noise, reduce echoes, and reverberations. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a Non-PVC (PETG / PET) lightweight silent locking floor and a preparation method thereof to solve the problem of poor sound insulation effect of traditional floors.

[0006] Based on the above purpose, the present invention provides a Non-PVC (PETG / PET) lightweight silent locking floor, including a wear-resistant layer, a color film layer, a base material layer, and a floor mat;

[0007] The base material layer comprises the following raw materials in parts by weight: 30 - 40 parts of PETG, 60 - 70 parts of PET, 10 - 40 parts of toughening agent, 1 - 1.5 parts of lubricant, 200 - 300 parts of calcium powder, 3 - 5 parts of antioxidant, 1 - 3 parts of foaming agent, 1 - 5 parts of compound chain extender, and 1 - 2 parts of polyamide;

[0008] The compound chain extender is a mixture of tetraepoxypropyl diaminodiphenylmethane and modified mesoporous silica in a weight ratio of 1:1;

[0009] The preparation steps of the modified mesoporous silica are as follows:

[0010] Add mesoporous silica into absolute ethanol, ultrasonically clean for 1 h, add formic acid, adjust the pH value to 4.5 - 5, then add [8-(epoxypropoxy)-n-octyl]trimethoxysilane and (3-triethoxysilylpropyl)succinic anhydride, keep at 90 - 100 °C for 12 - 14 h, after the reaction is completed, filter, wash, and dry to obtain the modified mesoporous silica.

[0011] Preferably, the weight ratio of the mesoporous silica, [8-(epoxypropoxy)-n-octyl]trimethoxysilane, (3-triethoxysilylpropyl)succinic anhydride, and absolute ethanol is 15 - 20:8 - 10:1 - 2:100 - 200.

[0012] Preferably, the filtration is vacuum filtration.

[0013] Preferably, the drying is drying in a forced-air drying oven at 70 °C for 4 h.

[0014] Preferably, the toughening agent is one of thermoplastic polyurethane, ethylene-ethyl acrylate copolymer, SEBS, and rubber powder.

[0015] Preferably, the lubricant is one of stearic acid, polyethylene wax, and EBS.

[0016] Preferably, the antioxidant is one of antioxidant DLTP and antioxidant 1076.

[0017] Preferably, the foaming agent is one of a mixture of inorganic foaming agent and organic foaming agent in a weight ratio of 1:1, compressed carbon dioxide, and liquefied carbon dioxide. The inorganic foaming agent is sodium bicarbonate, and the organic foaming agent is azodicarbonamide.

[0018] Furthermore, when the foaming method is chemical foaming, the foaming agent is a mixture of inorganic foaming agent and organic foaming agent in a weight ratio of 1:1; when the foaming method is physical foaming, the foaming agent is compressed carbon dioxide or liquefied carbon dioxide.

[0019] Preferably, the particle size of the mesoporous silica is 200 - 300 nm.

[0020] Further, the mesoporous silica is purchased from Xi'an Ruixi Biotechnology Co., Ltd., and the product number is 32423.

[0021] Preferably, the color film layer is one of PET color film, PETG color film, and TPU color film.

[0022] Preferably, the wear-resistant layer is one of PET film, PETG film, and TPU film.

[0023] Preferably, the floor mat is one of PE foam and EVA foam.

[0024] Preferably, the thickness of the color film layer is 0.05 - 0.15 mm.

[0025] Preferably, the thickness of the wear-resistant layer is 0.1 - 0.2 mm.

[0026] Preferably, the thickness of the floor mat is 0.5 - 5 mm.

[0027] Preferably, the thickness of the substrate layer is 2 - 12 mm.

[0028] Further, the present invention also provides a preparation method for a Non-PVC (PETG / PET) lightweight and soundproof click-lock floor, and the specific preparation steps are as follows:

[0029] (1) Dry PET and PETG respectively, and then premix PET, PETG, toughening agent, lubricant, calcium powder, antioxidant, composite chain extender, and polyamide at 70 - 80 °C to obtain a mixed material; add a foaming agent to the mixed material, and foam and extrude at 260 - 270 °C to obtain a substrate layer;

[0030] (2) Place the color film layer and the wear-resistant layer on the upper surface of the substrate layer in sequence, then heat to 70 - 80 °C, and make the color film layer and the wear-resistant layer adhere to the substrate evenly in sequence through an embossing roller, then uniformly coat a UV coating on its surface and cure it. Finally, bond the floor mat to the lower surface of the substrate layer through PUR hot melt adhesive to obtain a Non-PVC (PETG / PET) lightweight and soundproof click-lock floor.

[0031] Preferably, the intrinsic viscosity of the PET in step (1) is 0.6 - 1 dL / g;

[0032] Preferably, the drying temperature of the PET and PETG in step (1) is 60 - 70 °C.

[0033] The beneficial effects of the present invention:

[0034] The Non-PVC (PETG / PET) lightweight soundproof click-lock floor of the present invention, by using tetraglycidyl diaminodiphenylmethane and modified mesoporous silica as composite chain extenders during the preparation of the substrate layer, the two crosslink synergistically, significantly improving the foaming performance and mechanical properties of the substrate layer while ensuring the overall soundproof effect of the floor.

[0035] The Non-PVC (PETG / PET) lightweight soundproof click-lock floor of the present invention, by adjusting the chain length of the surface groups of the modified mesoporous silica during the preparation of the substrate layer, makes both long-chain groups and short-chain groups exist on the surface of the modified mesoporous silica. During the subsequent foaming process, the cell structure is optimized, further improving the foaming ratio and mechanical stability, and further enhancing the overall soundproof effect of the floor.

[0036] The Non-PVC (PETG / PET) lightweight soundproof click-lock floor of the present invention, by further adjusting the proportion of the grafted groups on the surface of the modified mesoporous silica during the preparation of the substrate layer, reduces the rate of the crosslinking reaction, ensuring the foaming time, making the foaming more uniform and having a better foaming ratio, and guaranteeing its soundproof effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art.

[0038] Figure 1 It is a schematic structural diagram of the Non-PVC (PETG / PET) lightweight soundproof click-lock floor obtained in Example 2 of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] To make the objectives, technical solutions, and advantages of the present invention clearer and more understandable, the following further details the present invention in conjunction with specific embodiments.

[0040] The properties of the raw materials used in the embodiments and comparative examples of the present invention are as follows: the particle size of the mesoporous silica is 250 nm; the intrinsic viscosity of PET is 0.8 dL / g.

[0041] Example 1: A Non-PVC (PETG / PET) lightweight soundproof click-lock floor, and the specific preparation steps are as follows:

[0042] (1) Add 15 g of mesoporous silica to 100 g of absolute ethanol, ultrasonically clean for 1 h, add formic acid to adjust the pH value to 4.5, then add 8 g of [8-(glycidyloxy)-n-octyl]trimethoxysilane and 1 g of (3-triethoxysilylpropyl)succinic anhydride, and keep at 90 °C for 12 h. After the reaction ends, filter, wash at room temperature under vacuum, and dry at 70 °C for 4 h to obtain modified mesoporous silica;

[0043] (2) Tetraglycidyl diaminodiphenyl methane and modified mesoporous silica are mixed in a weight ratio of 1:1 to obtain a composite chain extender; and sodium bicarbonate and azodicarbonamide are mixed in a weight ratio of 1:1 to obtain a foaming agent.

[0044] (3) PET and PETG are dried at 60 °C respectively. Subsequently, 60 g of PET, 40 g of PETG, 10 g of rubber powder, 1 g of polyethylene wax, 200 g of calcium powder, 3 g of antioxidant 1076, 1 g of composite chain extender and 1 g of polyamide are premixed at 70 °C to obtain a mixed material; 1 g of foaming agent is added to the mixed material, and foaming and extrusion are carried out at 260 °C to obtain a base material layer.

[0045] (4) The color film layer and the wear-resistant layer are sequentially placed on the upper surface of the base material layer. After heating to 70 °C, the color film layer and the wear-resistant layer are sequentially and evenly adhered to the base material through an embossing roller. Then, a UV coating is evenly coated on its surface and cured. Finally, the floor mat is bonded to the lower surface of the base material layer through PUR hot melt adhesive to obtain a Non-PVC (PETG / PET) lightweight silent lock floor.

[0046] Example 2: A Non-PVC (PETG / PET) lightweight silent lock floor, and the specific preparation steps are as follows:

[0047] (1) 18 g of mesoporous silica is added to 150 g of absolute ethanol, ultrasonically cleaned for 1 h, formic acid is added, and the pH value is adjusted to 4.8. Subsequently, 9 g of [8-(glycidyloxy)-n-octyl] trimethoxysilane and 1.5 g of (3-triethoxysilylpropyl) succinic anhydride are added, and the mixture is kept at 95 °C for 13 h. After the reaction ends, vacuum filtration, washing are carried out at room temperature, and drying is carried out at 70 °C for 4 h to obtain modified mesoporous silica.

[0048] (2) Tetraglycidyl diaminodiphenyl methane and modified mesoporous silica are mixed in a weight ratio of 1:1 to obtain a composite chain extender; and sodium bicarbonate and azodicarbonamide are mixed in a weight ratio of 1:1 to obtain a foaming agent.

[0049] (3) PET and PETG are dried at 65 °C respectively. Subsequently, 65 g of PET, 35 g of PETG, 20 g of rubber powder, 1.5 g of polyethylene wax, 250 g of calcium powder, 4 g of antioxidant 1076, 3 g of composite chain extender and 1.5 g of polyamide are premixed at 75 °C to obtain a mixed material; 2 g of foaming agent is added to the mixed material, and foaming and extrusion are carried out at 265 °C to obtain a base material layer.

[0050] (4) Place the color film layer and the wear-resistant layer on the upper surface of the base material layer in sequence. After heating to 75 °C, use an embossing roller to evenly adhere the color film layer and the wear-resistant layer to the base material in sequence. Then, evenly coat a UV coating on its surface and cure it. Finally, bond the floor mat to the lower surface of the base material layer through PUR hot melt adhesive to obtain a Non-PVC (PETG / PET) lightweight soundproof locking floor.

[0051] Example 3: A Non-PVC (PETG / PET) lightweight soundproof locking floor, and the specific preparation steps are as follows:

[0052] (1) Add 20 g of mesoporous silica to 200 g of absolute ethanol, ultrasonically clean for 1 h, add formic acid, adjust the pH value to 5, and then add 10 g of [8-(glycidyloxy)-n-octyl] trimethoxysilane and 2 g of (3-triethoxysilylpropyl) succinic anhydride. Keep at 100 °C for 14 h. After the reaction is completed, filter, wash at room temperature under vacuum, and dry at 70 °C for 4 h to obtain modified mesoporous silica.

[0053] (2) Mix tetraglycidyl diaminodiphenyl methane and modified mesoporous silica in a weight ratio of 1:1 to obtain a composite chain extender; and mix sodium bicarbonate and azodicarbonamide in a weight ratio of 1:1 to obtain a foaming agent.

[0054] (3) Dry PET and PETG at 70 °C respectively. Then, premix 70 g of PET, 30 g of PETG, 40 g of rubber powder, 1.5 g of polyethylene wax, 300 g of calcium powder, 5 g of antioxidant 1076, 5 g of composite chain extender, and 2 g of polyamide at 80 °C to obtain a mixed material; add 3 g of foaming agent to the mixed material, foam at 270 °C, and extrude to obtain the base material layer.

[0055] (4) Place the color film layer and the wear-resistant layer on the upper surface of the base material layer in sequence. After heating to 80 °C, use an embossing roller to evenly adhere the color film layer and the wear-resistant layer to the base material in sequence. Then, evenly coat a UV coating on its surface and cure it. Finally, bond the floor mat to the lower surface of the base material layer through PUR hot melt adhesive to obtain a Non-PVC (PETG / PET) lightweight soundproof locking floor.

[0056] Comparative Example 1: A lightweight floor, and the specific preparation steps are as follows:

[0057] (1) Mix tetraglycidyl diaminodiphenyl methane and mesoporous silica in a weight ratio of 1:1 to obtain a composite chain extender; and mix sodium bicarbonate and azodicarbonamide in a weight ratio of 1:1 to obtain a foaming agent.

[0058] (2) Dry PET and PETG at 65°C respectively. Subsequently, premix 65 g of PET, 35 g of PETG, 20 g of rubber powder, 1.5 g of polyethylene wax, 250 g of calcium powder, 4 g of antioxidant 1076, 3 g of compound chain extender, and 1.5 g of polyamide at 75°C to obtain a mixed material; add 2 g of foaming agent to the mixed material, and conduct foaming and extrusion at 265°C to obtain a substrate layer;

[0059] (3) Place the color film layer and the wear-resistant layer on the upper surface of the substrate layer in sequence. After heating to 75°C, use an embossing roller to evenly adhere the color film layer and the wear-resistant layer to the substrate in sequence. Then, evenly coat a UV coating on its surface and cure it. Finally, bond the floor mat to the lower surface of the substrate layer with PUR hot melt adhesive to obtain a Non-PVC (PETG / PET) lightweight silent lock floor.

[0060] Comparative Example 2: A lightweight floor, and the specific preparation steps are as follows:

[0061] (1) Add 18 g of mesoporous silica to 150 g of absolute ethanol, ultrasonically clean for 1 h, add formic acid, adjust the pH value to 4.8, and then add 9 g of 3-(2,3-epoxypropoxy)propyltrimethoxysilane and 1.5 g of (3-triethoxysilylpropyl)succinic anhydride. Keep at 95°C for 13 h. After the reaction ends, filter, wash, and dry at 70°C for 4 h at room temperature under vacuum to obtain modified mesoporous silica;

[0062] (2) Mix tetraglycidyl diaminodiphenylmethane and modified mesoporous silica in a weight ratio of 1:1 to obtain a compound chain extender; and mix sodium bicarbonate and azodicarbonamide in a weight ratio of 1:1 to obtain a foaming agent;

[0063] (3) Dry PET and PETG at 65°C respectively. Subsequently, premix 65 g of PET, 35 g of PETG, 20 g of rubber powder, 1.5 g of polyethylene wax, 250 g of calcium powder, 4 g of antioxidant 1076, 3 g of compound chain extender, and 1.5 g of polyamide at 75°C to obtain a mixed material; add 2 g of foaming agent to the mixed material, and conduct foaming and extrusion at 265°C to obtain a substrate layer;

[0064] (4) Place the color film layer and the wear-resistant layer on the upper surface of the substrate layer in sequence. After heating to 75°C, use an embossing roller to evenly adhere the color film layer and the wear-resistant layer to the substrate in sequence. Then, evenly coat a UV coating on its surface and cure it. Finally, bond the floor mat to the lower surface of the substrate layer with PUR hot melt adhesive to obtain a Non-PVC (PETG / PET) lightweight silent lock floor.

[0065] Comparative Example 3: A lightweight floor, and the specific preparation steps are as follows:

[0066] (1) Add 18 g of mesoporous silica to 150 g of absolute ethanol, ultrasonically clean for 1 h, add formic acid, adjust the pH value to 4.8, and then add 5 g of [8-(glycidyloxy)-n-octyl]trimethoxysilane and 5.5 g of (3-triethoxysilylpropyl)succinic anhydride. Keep at 95 °C for 13 h. After the reaction is completed, filter, wash at room temperature under vacuum, and dry at 70 °C for 4 h to obtain modified mesoporous silica;

[0067] (2) Mix tetraglycidyl diaminodiphenylmethane and modified mesoporous silica in a weight ratio of 1:1 to obtain a composite chain extender; and mix sodium bicarbonate and azodicarbonamide in a weight ratio of 1:1 to obtain a foaming agent;

[0068] (3) Dry PET and PETG at 65 °C respectively. Then premix 65 g of PET, 35 g of PETG, 20 g of rubber powder, 1.5 g of polyethylene wax, 250 g of calcium powder, 4 g of antioxidant 1076, 3 g of composite chain extender and 1.5 g of polyamide at 75 °C to obtain a mixed material; add 2 g of foaming agent to the mixed material, foam at 265 °C, and extrude to obtain a substrate layer;

[0069] (4) Place the color film layer and the wear-resistant layer on the upper surface of the substrate layer in sequence. After heating to 75 °C, make the color film layer and the wear-resistant layer adhere to the substrate evenly in sequence through an embossing roller. Then evenly coat a UV coating on its surface and cure it. Finally, bond the floor mat to the lower surface of the substrate layer through PUR hot melt adhesive to obtain a Non-PVC (PETG / PET) lightweight silent lock floor.

[0070] Performance test

[0071] Perform performance tests on the obtained substrate layer, and the test results are shown in Table 1;

[0072] Density: Measured by the drainage method according to ASTM D792-00;

[0073] Foaming ratio: Measured by the drainage method according to ASTM D792-00. Among them, the density of the unfoamed sample is P1, and the density of the foamed sample is P2. The calculation formula of the foaming ratio is as follows:

[0074]

[0075] Average cell diameter: Analyze the electron microscope photos of the foamed sample using Image J software;

[0076] Perform performance tests on the obtained floor, and the test results are shown in Table 2;

[0077] Tensile strength: Tested according to ASTM C297;

[0078] Sound insulation effect: Use a decibel meter to test the maximum decibel value when dropping a ball.

[0079] Table 1 Performance test results

[0080]

[0081] Table 2 Performance test results

[0082]

[0083] Data analysis: As can be seen from Examples 1 - 3 in Tables 1 and 2, for the Non-PVC (PETG / PET) lightweight soundproof locking floor of the present invention, the density of its base material layer is small, which can meet the characteristics of lightweight, and its foaming performance is relatively excellent, which can meet the requirements of its soundproof performance, and its mechanical properties are relatively good. When the obtained soundproof board is tested by the ball-drop experiment, the maximum decibel value does not exceed 74 dB, and it has relatively excellent sound insulation effect.

[0084] As can be seen from Example 2 and Comparative Example 1 in Tables 1 and 2, by using tetraepoxypropyl diaminodiphenylmethane and modified mesoporous silica as composite chain extenders in the present invention, its foaming performance, mechanical properties and soundproof performance are significantly improved. This is mainly because on the one hand, tetraepoxypropyl diaminodiphenylmethane and modified mesoporous silica can undergo a synergistic cross-linking reaction, further enhancing the stability of the cross-linked structure, restricting the movement of molecular segments, and, the modified mesoporous silica particles are embedded in the cell walls, enhancing the mechanical strength of the cell walls, preventing the cells from merging or rupturing during the expansion process, reducing the tendency of the cell walls to collapse, and making the cells more stable; on the other hand, more nucleation points can be formed, increasing the cell density, avoiding the phenomenon of locally too large or too small cells, and effectively ensuring the soundproof effect of the board.

[0085] As can be seen from Example 2 and Comparative Example 2 in Tables 1 and 2, by further adjusting the chain length of the surface groups of the modified mesoporous silica in the present invention, the foaming performance and soundproof effect of the board are further improved. This is mainly because the common use of long and short chains, on the one hand, the long chains can provide flexible chain segments, forming a more flexible cross-linked network, thereby absorbing more stress and reducing the rupture of the cell walls caused by stress concentration; the short chains can ensure the formation of locally high-density cross-linking points, providing more nucleation sites for gas, promoting the uniform nucleation of cells, optimizing the cell structure, and further improving the foaming ratio and mechanical stability.

[0086] It can be seen from Examples 2 in Tables 1 and 2 and Comparative Example 3 that by further controlling the ratio of the groups grafted on the surface of the modified mesoporous silica, the present invention reduces the rate of the reaction between the anhydride and the hydroxyl group to generate a carboxyl group during the chain extension process, thereby reducing the rate of the cross-linking reaction, ensuring the foaming time, making the foaming more uniform, having a better foaming ratio, and ensuring its sound insulation effect.

[0087] Those of ordinary skill in the art should understand that the discussion of any above embodiment is only exemplary and is not intended to imply that the scope of the present invention is limited to these examples; under the concept of the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the present invention as described above, which are not provided in detail for the sake of brevity.

Claims

1. A Non-PVC (PETG / PET) lightweight silent lock floor, characterized in that: It includes a wear-resistant layer, a color film layer, a base material layer and a floor mat; The substrate layer comprises the following raw materials in parts by weight: 30-40 parts of PETG, 60-70 parts of PET, 10-40 parts of toughening agent, 1-1.5 parts of lubricant, 200-300 parts of calcium powder, 3-5 parts of antioxidant, 1-3 parts of foaming agent, 1-5 parts of composite chain extender, and 1-2 parts of polyamide; The composite chain extender is a mixture of tetraepoxypropyldiaminodiphenylmethane and modified mesoporous silica in a weight ratio of 1:1; The preparation steps of the modified mesoporous silica are as follows: The mesoporous silica was added to anhydrous ethanol and ultrasonically cleaned for h. Formic acid was added to adjust the pH value to 4.5-5. Then [8-(epoxypropyloxy)-octyl]trimethoxysilane and (3-triethoxysilylpropyl)succinic anhydride were added. The reaction was maintained at 90-100°C for 12-14 hours. After the reaction was completed, the modified mesoporous silica was filtered, washed and dried to obtain the modified mesoporous silica.

2. The Non-PVC (PETG / PET) lightweight silent lock floor according to claim 1, characterized in that: The weight ratio of the mesoporous silica, [8-(epoxypropyloxy)-n-octyl]trimethoxysilane, (3-triethoxysilylpropyl)succinic anhydride and anhydrous ethanol is 15-20:8-10:1-2:100-200.

3. The Non-PVC (PETG / PET) lightweight silent lock floor according to claim 1, characterized in that: The toughening agent is one of thermoplastic polyurethane, ethylene-ethyl acrylate copolymer, SEBS and rubber powder.

4. The Non-PVC (PETG / PET) lightweight silent lock floor according to claim 1, characterized in that: The lubricant is one of stearic acid, polyethylene wax and EBS.

5. The Non-PVC (PETG / PET) lightweight silent lock floor according to claim 1, characterized in that: The antioxidant is one of antioxidant DLTP and antioxidant 1076.

6. The Non-PVC (PETG / PET) lightweight silent lock floor according to claim 1, characterized in that: The foaming agent is a mixture of an inorganic foaming agent and an organic foaming agent in a weight ratio of 1:1, compressed carbon dioxide, and liquefied carbon dioxide. The inorganic foaming agent is sodium bicarbonate, and the organic foaming agent is azodicarbonamide.

7. The Non-PVC (PETG / PET) lightweight silent lock floor according to claim 1, characterized in that: The particle size of the mesoporous silica is 200-300 nm.

8. The Non-PVC (PETG / PET) lightweight silent lock floor according to claim 1, characterized in that: The color film layer is one of PET color film, PETG color film and TPU color film; the wear-resistant layer is one of PET film, PETG film and TPU film; the floor mat is one of PE foam and EVA foam.

9. The Non-PVC (PETG / PET) lightweight silent lock floor according to claim 1, characterized in that: The thickness of the color film layer is 0.05-0.15 mm, the thickness of the wear-resistant layer is 0.1-0.2 mm, and the thickness of the floor mat is 0.5-5.0 mm.

10. A method for preparing the Non-PVC (PETG / PET) lightweight silent lock floor according to claims 1-9, characterized in that: The specific preparation steps are as follows: (1) drying PET and PETG respectively, and then premixing PET, PETG, a toughening agent, a lubricant, calcium powder, an antioxidant, a composite chain extender and polyamide at 70-80° C. to obtain a mixed material; adding a foaming agent to the mixed material, foaming at 260-270° C., and extruding to obtain a substrate layer; (2) The color film layer and the wear-resistant layer are placed on the upper surface of the substrate layer in sequence, and then heated to 70-80°C. The color film layer and the wear-resistant layer are uniformly adhered to the substrate in sequence through an embossing roller, and then a UV coating is uniformly applied on the surface and cured. Finally, the floor mat is attached to the lower surface of the substrate layer through PUR hot melt adhesive to obtain a Non-PVC (PETG / PET) lightweight silent lock floor.

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