Environment-friendly low-temperature-resistant high-toughness anti-falling floor and preparation method thereof

Abstract

The embodiment of the invention discloses an environment-friendly low-temperature-resistant high-toughness anti-falling floor and a preparation method thereof, relates to the technical field of new material floors, and aims to solve the technical problem that the performance of an existing anti-falling floor is difficult to meet application requirements. A through cross-shaped groove is formed in the back face of the anti-falling floor, the anti-falling floor is composed of a plurality of sub-floors, and each sub-floor is composed of a surface layer, a middle layer and a bottom surface layer. Wherein the surface layer is a polyurethane film, the middle layer is polyurethane foam, and the bottom surface layer is a polyurethane film; the sub-floors are spliced through the connecting buckles, at least one group of connecting buckles are arranged at the splicing position of every two adjacent sub-floors, each connecting buckle comprises a trapezoidal bayonet protruding towards the outer side of the floor and a trapezoidal clamping groove sunken towards the inner side of the floor, a rectangular convex block is arranged in the middle of each trapezoidal bayonet, a rectangular groove is formed in the middle of each trapezoidal clamping groove, and the rectangular convex blocks are arranged in the rectangular grooves. And the rectangular convex blocks are embedded into the corresponding rectangular grooves. By adopting the integrally formed structure, the production process is obviously reduced, and the production efficiency is effectively improved.

Description

Technical Field

[0001] This application relates to the technical field of new material floors, and particularly relates to an environmentally friendly, low-temperature resistant, high-strength, tough and anti-fall floor and a preparation method thereof. Background Art

[0002] Due to the degradation of physical functions and the influence of chronic diseases, the balance ability of the elderly becomes poor and they are prone to falling. Falling will have an adverse impact on the health of the elderly and may lead to fractures, craniocerebral injuries, internal and external injuries, etc., which is the main reason for some elderly people to stay in bed for a long time. Therefore, installing anti-fall floors and improving the home environment are necessary measures to prevent the elderly from getting injured.

[0003] Existing anti-fall floors mainly use moisture-curing polyurethane, rubber, foamed polyurethane, etc. as the elastic layer, and through the use of a multi-layer structure design, a bottom layer, a paint layer, a wear-resistant layer, etc. are added to the upper and lower surfaces of the elastic layer to achieve key functions such as floor protection, wear resistance, and tear resistance. For example, in the prior art 1, a polyurethane protective floor with a 5-layer structure of a bottom layer, an elastic layer, a strengthening layer, a paint layer, and a super wear-resistant surface layer was designed and produced, which was composed of solvent-free polyurethane, solvent-free moisture-curing polyurethane, one-component moisture-curing polyurethane, and super wear-resistant polyurethane topcoat respectively. In the prior art 2, a polyurethane protective floor composed of a fiberglass grid, a fiberglass mesh, a polyurethane foam array, a thermoplastic polyurethane sealing layer, and a thermoplastic polyurethane surface layer was designed and produced, and each layer was formed by combining hot pressing and cold pressing. In the prior art 3, a protective floor composed of a rubber prefabricated board and a PVC film was designed and produced, and the rubber prefabricated board and the PVC film were connected by glue and fixed by rolling.

[0004] However, the anti-fall floors in the above-mentioned prior arts use materials such as one-component moisture-curing polyurethane, rubber, and polyurethane foam array as the elastic layer, the functional components are relatively single, and the preparation process is relatively simple. There is a lack of regulation of the fine structure of the materials, resulting in the mismatch between the mechanical, chemical, and thermal properties of the materials and the application scenarios of the elderly falling, and it is difficult to achieve the due protection, buffering, and energy absorption effects. On the other hand, the molecular structure design of the materials such as polyurethane and rubber used in the prior art is relatively simple, and functions such as heat preservation, moisture permeability, and low-temperature resistance cannot be realized. Therefore, it is difficult to meet the application requirements. Summary of the Invention

[0005] The main purpose of this application is to provide an environmentally friendly, low-temperature resistant, high-strength, tough and anti-fall floor and a preparation method thereof, aiming to solve the technical problem that the performance of the existing anti-fall floors is difficult to meet the application requirements.

[0006] To achieve the above purpose, the technical solutions adopted in the embodiments of this application are as follows:

[0007] In a first aspect, an embodiment of the present application provides an environmentally friendly, low-temperature resistant, high-strength, tough and anti-drop floor. A through cross-groove is provided on the back of the anti-drop floor, and it is composed of several sub-floors. Each sub-floor is composed of a surface layer, an intermediate layer and a bottom layer; wherein, the surface layer is a polyurethane film, the intermediate layer is a polyurethane foam, and the bottom layer is a polyurethane film.

[0008] The sub-floors are spliced through connecting buckles. At least one set of connecting buckles is provided at the splicing position of every two adjacent sub-floors. The connecting buckle includes a trapezoidal bayonet protruding outward from the floor and a trapezoidal slot recessed inward from the floor. A rectangular convex block is provided in the middle of each trapezoidal bayonet, and a rectangular groove is provided in the middle of each trapezoidal slot. The rectangular convex block is embedded in the corresponding rectangular groove.

[0009] As some optional embodiments of the present application, the polyurethane film is prepared from the following raw materials by weight: 40 parts - 70 parts of polyether-based TPU, 40 parts - 60 parts of polyester-based TPU, 0.5 parts - 3 parts of peroxide, 1 part - 7 parts of hydrolysis inhibitor, 6 parts - 14 parts of toughening agent, 2 parts - 7 parts of compatibilizer, and 0.5 parts - 3 parts of slip agent.

[0010] As some optional embodiments of the present application, the water vapor permeability of the polyether-based TPU is 5400 g / m 2 / day;

[0011] The molecular structure of the hard segment part of the polyester-based TPU and the polyether-based TPU is diphenylmethane diisocyanate, and the molecular structure of the soft segment part is one or a combination of more of 3-methyl-1,5-pentanediol, N-methyldiethanolamine, butanediol, propanediol and ethylene glycol.

[0012] As some optional embodiments of the present application, the peroxide is one or a combination of more of vulcanizing agent TMCH, vulcanizing agent bis(2,5-dimethyl-2,5-di(t-butylperoxy)hexane) and t-amyl hydroperoxide;

[0013] The hydrolysis inhibitor is one or a combination of more of polycarbodiimide, N,N'-dicyclohexylcarbodiimide and bis(2,6-diisopropylphenyl)carbodiimide;

[0014] The toughening agent is one or a combination of two of epoxidized natural rubber, epoxy acrylate rubber and styrene-butadiene-styrene rubber;

[0015] The compatibilizer is one or a combination of two of polybutadiene maleic anhydride adduct, hydroxylated polybutadiene and maleic anhydride;

[0016] The slip agent is one or a combination of more of oleic acid amide, N,N'-ethylenebisoleic acid amide, stearic acid amide and erucic acid amide.

[0017] In some alternative embodiments of the present application, the polyurethane film is prepared by the following steps:

[0018] 40 parts - 70 parts of polyether-based TPU, 40 parts - 60 parts of polyester-based TPU, 0.5 parts - 3 parts of peroxide, 1 part - 7 parts of hydrolysis inhibitor, 6 parts - 14 parts of toughening agent, 2 parts - 7 parts of compatibilizer, and 0.5 parts - 3 parts of slip agent are uniformly mixed to obtain a mixed material A;

[0019] The mixed material A is placed in a hot air circulation oven and baked at 90°C - 105°C for 6 hours - 12 hours to fully remove moisture, obtaining a dried mixed material A;

[0020] The dried mixed material A is added into a single-screw extruder and melt-extruded to obtain a molten material B;

[0021] The molten material B is added into a blown film machine or a casting machine to be processed into a film, and then cooled, stretched, shaped, and wound to obtain a polyurethane film.

[0022] In some alternative embodiments of the present application, the polyurethane foam is prepared from the following raw materials by weight: 90 parts - 100 parts of bio-based polyether polyol, 55 parts - 65 parts of diphenylmethane diisocyanate, 2 parts - 5 parts of foaming agent, 1 part - 7 parts of crosslinking agent, 1 part - 2 parts of chain extender, 0.05 parts - 0.07 parts of catalyst, and 0.5 parts - 1 part of hydrolysis-resistant stabilizer.

[0023] In some alternative embodiments of the present application, the bio-based content of the bio-based polyether polyol is ≥60%, the hydroxyl value of the bio-based polyether polyol is 160 mg KOH / g - 185 mg KOH / g, the viscosity at 25°C is 2800 cps - 4000 cps, and the density at 20°C is 0.98 g / cm 3 -1.02 g / cm 3 .

[0024] In some alternative embodiments of the present application, the foaming agent is one or more of water, cyclopentane, n-pentane, isopentane, pentafluoropropane, and pentafluorobutane;

[0025] The crosslinking agent is one or more of ethylenediamine, N,N'-dimethylhexadecylamine, and isophorone diamine;

[0026] The chain extender is one or more of trimethylenediamine, trimethylolaminoethylethylenediamine, and pentamethyldipropylenetriamine;

[0027] The catalyst is one or more of bismuth isooctanoate, bismuth neodecanoate, stannous octoate, and dibutyltin dilaurate;

[0028] The hydrolysis-resistant stabilizer is one or more of polycarbodiimide, N,N'-dicyclohexylcarbodiimide, and bis(2,6-diisopropylphenyl)carbodiimide.

[0029] As some alternative embodiments of the present application, the thickness of the polyurethane film of the surface layer is 0.2 mm, and the thickness of the polyurethane film of the bottom layer is 0.1 mm.

[0030] Second, the embodiments of the present application also provide a method for preparing the above-mentioned environmentally friendly low-temperature resistant, high-strength and tough anti-drop floor, including the following steps:

[0031] Fix the floor mold in a high-pressure foaming machine, then lay the polyurethane film on the bottom and top of the mold and fix it by vacuum pumping; uniformly mix the bio-based polyether polyol, diphenylmethane diisocyanate, foaming agent, cross-linking agent, chain extender, catalyst, and hydrolysis-resistant stabilizer in the storage tank in the mixing head, then transport it to the nozzle through a high-pressure pump, and cast it into the mold by the nozzle; close the mold and react in a high-temperature and high-pressure environment for 3 minutes to 5 minutes, open the mold, and obtain the environmentally friendly low-temperature resistant, high-strength and tough anti-drop floor.

[0032] Compared with the prior art, the anti-drop floor of the present application is provided with a through cross groove on the back, and is composed of several sub-floors. Each sub-floor is composed of a surface layer, an intermediate layer, and a bottom layer; wherein, the surface layer is a polyurethane film, the intermediate layer is a polyurethane foam, and the bottom layer is a polyurethane film; the sub-floors are spliced through connecting buckles, and at least one set of connecting buckles is provided at the splicing position of every two adjacent sub-floors. The connecting buckle includes a trapezoidal bayonet protruding outward from the floor and a trapezoidal slot recessed inward from the floor. A rectangular convex block is provided in the middle of each trapezoidal bayonet, and a rectangular groove is provided in the middle of each trapezoidal slot. The rectangular convex block is embedded in the corresponding rectangular groove. The environmentally friendly low-temperature resistant, high-strength and tough anti-drop floor involved in the present application adopts an integrally formed structure, significantly reducing the production process and effectively improving the production efficiency. The floor design includes efficient and convenient connecting components, with a simple laying process, easy splicing operation and stable connection, which is especially suitable for home and office environments; and the surface layer and bottom layer of the anti-drop floor of the present application are polyurethane films with different thicknesses, and the intermediate layer is polyurethane foam, so as to improve the buffering performance and impact protection performance of the anti-drop floor while meeting the wear resistance and tear resistance. Description of the Drawings

[0033] Figure 1 It is a schematic structural diagram of the environmentally friendly low-temperature resistant, high-strength and tough anti-drop floor involved in the embodiments of the present application;

[0034] Figure 2 It is a schematic structural diagram of the connecting buckle involved in the embodiments of the present application;

[0035] Figure 3 The molecular structure of the environmentally friendly, high-strength, tough and low-temperature resistant polyurethane involved in the embodiments of the present application;

[0036] Figure 4 The surface pore structure of the environmentally friendly, intelligent impact-resistant polyurethane foam involved in the embodiments of the present application;

[0037] Figure 5 The back pore structure of the environmentally friendly, intelligent impact-resistant polyurethane foam involved in the embodiments of the present application;

[0038] Figure 6 The compression stress-strain curve of the environmentally friendly, low-temperature resistant, high-strength, tough and anti-fall floor involved in the embodiments of the present application;

[0039] Figure 7 The shear force-strain curve of the environmentally friendly, low-temperature resistant, high-strength, tough and anti-fall floor involved in the embodiments of the present application;

[0040] In the figure, 1 represents the sub-floor, 2 represents the connecting buckle, 3 represents the cross groove, 21 represents the trapezoidal bayonet, 22 represents the rectangular protrusion, 23 represents the trapezoidal slot, 24 represents the rectangular groove, 25 represents the cross-section of the rectangular protrusion, and 26 represents the cross-section of the rectangular groove. Detailed implementation manners

[0041] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0042] It should be noted that the "environmentally friendly" as described in the present application means that the raw materials used in the product come from nature and have the characteristics of non-toxicity, recyclability and degradability. The "low-temperature resistant" means that the product can maintain its service performance unchanged in a low-temperature (minus 20 °C) environment. The "high-strength and tough" means that the product surface has functions such as wear resistance, scratch resistance, tear resistance and corrosion resistance. The "anti-fall" means that the product has the functions of buffering and absorbing the kinetic energy of a person falling, and reducing the damage caused by a person falling.

[0043] Through research, it is found that the following technical defects of the anti-fall floors on the market at present need to be overcome:

[0044] Simple material structure and single performance: The existing technologies use materials such as one-component wet-curing polyurethane, rubber, polyurethane foam arrays, etc. as the elastic layer. The functional components are relatively single and the preparation process is relatively simple. There is a lack of regulation of the fine structure of the material, resulting in the mismatch between the mechanical, chemical and thermal properties of the material and the application scenarios of the elderly falling, and it is difficult to achieve the due protection, buffering and energy absorption effects. On the other hand, the molecular structure design of the polyurethane, rubber and other materials used in the existing technologies is relatively simple, and it is impossible to achieve advanced functions such as heat preservation, moisture permeability and low-temperature resistance.

[0045] Complex process and scattered process flow: The existing technology uses a multi-layer structural design, which requires separate preparation and production of each unit layer, and then combines them through methods such as gluing and hot pressing.

[0046] Inconvenient laying: The existing technical solutions lack considerations and designs for the laying and splicing of protective floors.

[0047] Lack of environmental protection and comfort considerations: The existing technical solutions do not use raw materials with low carbon emissions and bio-based materials. The prepared floor materials lack home functions such as moisture permeability and exhaust, and have limited effects on improving the home environment.

[0048] Based on this, the embodiments of the present application provide an environmentally friendly, low-temperature resistant, high-strength, tough and anti-drop floor, as Figure 1 shown. The anti-drop floor is composed of several sub-floors 1, and each sub-floor is composed of a surface layer, an intermediate layer and a bottom layer; wherein, the surface layer is a polyurethane film with a thickness of 0.2 mm, the intermediate layer is a polyurethane foam, and the bottom layer is a polyurethane film with a thickness of 0.1 mm;

[0049] Among them, the polyurethane film is prepared from the following raw materials by weight: 40 parts - 70 parts of polyether-based TPU, 40 parts - 60 parts of polyester-based TPU, 0.5 parts - 3 parts of peroxide, 1 part - 7 parts of anti-hydrolysis agent, 6 parts - 14 parts of toughening agent, 2 parts - 7 parts of compatibilizer and 0.5 parts - 3 parts of slip agent. The water vapor permeability of the polyether-based TPU is 5400 g / m 2 / day; the molecular structure of the hard segment part of the polyester-based TPU and the polyether-based TPU is diphenylmethane diisocyanate, and the molecular structure of the soft segment part is one or more combinations of 3-methyl-1,5-pentanediol, N-methyldiethanolamine, butanediol, propanediol and ethylene glycol. The peroxide is one or more combinations of vulcanizing agent TMCH, vulcanizing agent bis-25 and tert-amyl hydroperoxide; the anti-hydrolysis agent is one or more combinations of polycarbodiimide, N,N'-dicyclohexylcarbodiimide and bis(2,6-diisopropylbenzene)carbodiimide; the toughening agent is one or two combinations of epoxidized natural rubber, epoxy acrylate rubber and styrene-butadiene-styrene rubber; the compatibilizer is one or two combinations of polybutadiene maleic anhydride adduct, hydroxylated polybutadiene and maleic anhydride; the slip agent is one or more combinations of oleic acid amide, N,N'-ethylenebisoleic acid amide, stearic acid amide and erucic acid amide.

[0050] Further, the polyurethane film is prepared through the following steps: uniformly mixing 40 parts - 70 parts of polyether-based TPU, 40 parts - 60 parts of polyester-based TPU, 0.5 parts - 3 parts of peroxide, 1 part - 7 parts of hydrolysis-resistant agent, 6 parts - 14 parts of toughening agent, 2 parts - 7 parts of compatibilizer, and 0.5 parts - 3 parts of slip agent to obtain a mixed material A; placing the mixed material A in a hot air circulation oven and baking it at 90°C - 105°C for 6 hours - 12 hours to fully remove moisture and obtain a dry mixed material A; adding the dry mixed material A into a single-screw extruder and melt-extruding to obtain a molten material B; adding the molten material B into a blown film machine or a casting machine to process into a film, and then cooling, stretching, shaping, and winding to obtain the polyurethane film.

[0051] Among them, the polyurethane foam is prepared from the following raw materials by weight: 90 parts - 100 parts of bio-based polyether polyol, 55 parts - 65 parts of diphenylmethane diisocyanate, 2 parts - 5 parts of foaming agent, 1 part - 7 parts of crosslinking agent, 1 part - 2 parts of chain extender, 0.05 parts - 0.07 parts of catalyst, and 0.5 parts - 1 part of hydrolysis-resistant stabilizer. The bio-based content of the bio-based polyether polyol is ≥60%, the hydroxyl value of the bio-based polyether polyol is 160 mg KOH / g - 185 mg KOH / g, the viscosity at 25°C is 2800 cps - 4000 cps, and the density at 20°C is 0.98 g / cm 3 -1.02 g / cm 3 . The foaming agent is one or more of water, cyclopentane, n-pentane, isopentane, pentafluoropropane, and pentafluorobutane; the crosslinking agent is one or more of ethylenediamine, N,N'-dimethylhexadecylamine, and isophorone diamine; the chain extender is one or more of trimethylenediamine, trimethylol ethylenediamine, and pentamethyldipropylenetriamine; the catalyst is one or more of bismuth isooctanoate, bismuth neodecanoate, stannous octoate, and dibutyltin dilaurate; the hydrolysis-resistant stabilizer is one or more of polycarbodiimide, N,N'-dicyclohexylcarbodiimide, and bis(2,6-diisopropylphenyl)carbodiimide.

[0052] As Figure 1 shown, the back of the anti-drop floor is provided with a through cross groove 3 to facilitate moisture and air exhaust during use. The sub-floor 1 is spliced through a connecting buckle 2, and at least one set of connecting buckles 2 is provided at the splicing position of every two adjacent sub-floors 1. As Figure 2 shown, the connecting buckle 2 includes a trapezoidal bayonet 21 protruding outward from the floor and a trapezoidal slot 23 recessed inward from the floor. A rectangular convex block 22 is provided in the middle of each trapezoidal bayonet 21, and a rectangular groove 24 is provided in the middle of each trapezoidal slot 23. The rectangular convex block 22 is embedded in the corresponding rectangular groove 24 to tightly connect adjacent sub-floors.

[0053] In a second aspect, an embodiment of the present application further provides a method for preparing the above-mentioned environmentally friendly, low-temperature resistant, high-strength, tough and anti-drop floor, including the following steps:

[0054] Fix the floor mold in a high-pressure foaming machine, then lay polyurethane films on the bottom and top of the mold and fix them by vacuum pumping; uniformly mix the bio-based polyether polyol, diphenylmethane diisocyanate, foaming agent, crosslinking agent, chain extender, catalyst and hydrolysis-resistant stabilizer in the mixing head in the storage tank, then transport them to the nozzle through a high-pressure pump, and cast them into the mold by the nozzle; close the mold and react for 3 to 5 minutes in a high-temperature and high-pressure environment, and then open the mold to obtain the environmentally friendly, low-temperature resistant, high-strength, tough and anti-drop floor.

[0055] Based on the proposed innovative technical solution, compared with the prior art, the present application demonstrates the following significant technological advancements:

[0056] In the present application, by carefully designing the molecular structure of thermoplastic polyurethane, polyester-type and polyether-type molecular chains are introduced, and the ratio and crosslinking degree of polyester and polyether segments are optimized. These measures enable the prepared environmentally friendly, high-strength, tough and low-temperature resistant polyurethane film to possess excellent anti-swelling, anti-hydrolysis, anti-tearing, anti-puncturing, supporting and waterproof and moisture-permeable properties. In addition, by embedding an epoxidized natural rubber network in the polyurethane crosslinking network and constructing an interpenetrating double-network polyurethane-rubber crosslinking system, as Figure 3 shown, the performance stability of the film in a low-temperature environment is significantly enhanced, and its wear resistance and anti-tearing performance are further improved. The chemical structure of the polyurethane-rubber crosslinking network is as Figure 3 shown.

[0057] In the present application, the molecular structure of the environmentally friendly, intelligent and anti-impact polyurethane foam is reasonably designed, the ratio of the soft segment polyol to the hard segment diphenylmethane diisocyanate in the molecular chain is optimized, and through the optimization of the formulation and foaming process, a foaming material with a uniform circular closed-cell structure is successfully prepared. This material exhibits excellent buffering, energy absorption and impact protection properties. The circular closed-cell structure of the material is as Figure 4 and Figure 5 shown.

[0058] The environmentally friendly, low-temperature resistant, high-strength, tough and anti-drop floor described in the present application adopts an integrally formed structure, significantly reducing the production process and effectively improving the production efficiency.

[0059] The environmentally friendly, low-temperature resistant, high-strength, tough and anti-drop floor is designed with efficient and convenient connection components. The laying process is simple, the splicing is fast and the connection is stable, which is especially suitable for applications in homes and offices.

[0060] The environmentally friendly, low-temperature resistant, high-strength and tough, anti-drop floor uses environmentally friendly and low-carbon bio-based raw materials, effectively reducing the carbon emissions of the product and its negative impact on the environment.

[0061] To facilitate the understanding of the technical solution of this application by those skilled in the art, the following further describes the technical solution of this application with specific embodiments:

[0062] Example 1

[0063] Mix 60 parts of polyether-based TPU, 40 parts of polyester-based TPU, 0.8 parts of vulcanizing agent bis-250, 1.5 parts of polycarbodiimide, 10 parts of epoxidized natural rubber, 4 parts of polybutadiene maleic anhydride adduct, and 3 parts of stearic acid amide evenly to obtain a mixed material A. Place the mixed material A in a hot air circulation oven and bake it at 105 °C for 8 hours. Add the dried mixed material A into the single-screw extruder of a blown film machine, and obtain a molten material B through melt extrusion. Introduce the molten material B into the die orifice of the blown film machine, and obtain an environmentally friendly, high-strength, tough, and low-temperature resistant polyurethane film through inflation, cooling, stretching, shaping, and winding.

[0064] Fix the floor mold in a high-pressure foaming machine, then lay the environmentally friendly, high-strength, tough, and low-temperature resistant polyurethane film on the bottom and top of the mold and fix it by vacuum pumping. Convey 100 parts of bio-based polyether polyol, 60 parts of diphenylmethane diisocyanate, 4 parts of pentafluorobutane, 7 parts of ethylenediamine, 2 parts of triethylenediamine, 0.05 parts of ethyltin octoate, and 0.8 parts of octadecyl 3,5-di-tert-butyl-4-hydroxyphenylpropionate in a storage tank into the mixing head for uniform mixing, and then convey it to the nozzle through a high-pressure pump and pour it into the mold. Close the mold and react at 95 °C for 5 minutes in a high-temperature and high-pressure environment, and open the mold to obtain the environmentally friendly, low-temperature resistant, high-strength and tough, anti-drop floor.

[0065] The floors are spliced with each other through connecting buckles. At least one set of connecting buckles 2 is provided at the splicing position of two adjacent floors 1, and a through cross-shaped groove 3 is provided on the back of the floor. The connecting buckle 2 includes a trapezoidal bayonet 21 protruding outward from the floor and a trapezoidal slot 23 recessed inward from the floor. A rectangular convex block 22 is provided in the middle of the trapezoidal bayonet, and a rectangular groove 24 is provided in the middle of the trapezoidal slot. The rectangular convex block 22 is embedded in the corresponding rectangular groove 24.

[0066] Example 2

[0067] Mix 70 parts of polyether-based TPU, 40 parts of polyester-based TPU, 1 part of vulcanizing agent bis-25, 2 parts of polycarbodiimide, 11 parts of epoxidized natural rubber, 5 parts of polybutadiene maleic anhydride adduct, and 4 parts of erucic acid amide evenly to obtain mixed material A. Place mixed material A in a hot air circulation oven and bake at 105°C for 10 hours. Add the dried mixed material A into the single-screw extruder of a blown film machine and obtain molten material B through melt extrusion. Introduce molten material B into the die orifice of the blown film machine, and through inflation, cooling, stretching, shaping, and winding, obtain an environmentally friendly, high-strength, tough, and low-temperature-resistant polyurethane film.

[0068] Fix the floor mold in a high-pressure foaming machine, then lay the environmentally friendly, high-strength, tough, and low-temperature-resistant polyurethane film on the bottom and top of the mold and fix it by vacuum pumping. Convey 90 parts of bio-based polyether polyol, 55 parts of diphenylmethane diisocyanate, 3 parts of n-pentane, 6 parts of N,N'-dimethylhexadecylamine, 2 parts of triethylenediamine, 0.07 parts of bismuth isooctanoate, and 1 part of polycarbodiimide in the storage tank into the mixing head for uniform mixing, then convey it to the nozzle through a high-pressure pump and pour it into the mold. Close the mold and react at 95°C for 5 minutes in a high-temperature and high-pressure environment, and open the mold to obtain an environmentally friendly, low-temperature-resistant, high-strength, tough, and anti-drop floor.

[0069] The floors are spliced with each other through connecting buckles. At least one set of connecting buckles 2 is provided at the splicing position of two adjacent floors 1, and a through cross-shaped groove 3 is provided on the back of the floor. The connecting buckle 2 includes a trapezoidal bayonet 21 protruding outward from the floor and a trapezoidal slot 23 recessed inward from the floor. A rectangular convex block 22 is provided in the middle of the trapezoidal bayonet, and a rectangular groove 24 is provided in the middle of the trapezoidal slot. The rectangular convex block 22 is embedded in the corresponding rectangular groove 24.

[0070] Example 3

[0071] Mix 50 parts of polyether-based TPU, 50 parts of polyester-based TPU, 1 part of vulcanizing agent TMCH, 2 parts of N,N'-dicyclohexylcarbodiimide, 10 parts of styrene-butadiene-styrene rubber, 4 parts of hydroxylated polybutadiene, 2 parts of maleic anhydride, and 3 parts of erucic acid amide evenly to obtain mixed material A. Place mixed material A in a hot air circulation oven and bake at 100°C for 12 hours. Add the dried mixed material A into the single-screw extruder of a blown film machine and obtain molten material B through melt extrusion. Introduce molten material B into the die orifice of the blown film machine, and through inflation, cooling, stretching, shaping, and winding, obtain an environmentally friendly, high-strength, tough, and low-temperature-resistant polyurethane film.

[0072] Fix the floor mold in a high-pressure foaming machine, then lay the environmentally friendly, high-strength, tough and low-temperature resistant polyurethane film on the bottom and top of the mold and fix it by vacuum pumping. Convey 100 parts of bio-based polyether polyol, 55 parts of diphenylmethane diisocyanate, 5 parts of pentafluorobutane, 7 parts of ethylenediamine, 2 parts of triethylenediamine, 0.05 parts of stannous octoate, and 1 part of polycarbodiimide in the storage tank to the mixing head for uniform mixing, and then convey it to the nozzle through a high-pressure pump and cast it into the mold. Close the mold and react at 95 °C for 5 minutes in a high-temperature and high-pressure environment, and then open the mold to obtain an environmentally friendly, low-temperature resistant, high-strength, tough and anti-fall floor.

[0073] The floors are spliced with each other through connecting buckles. At least one set of connecting buckles (2) are provided at the splicing position of two adjacent floors (1). A through cross groove (3) is provided on the back of the floor. The connecting buckle (2) includes a trapezoidal bayonet (21) protruding outward from the floor and a trapezoidal slot (23) recessed inward from the floor. A rectangular convex block (22) is provided in the middle of the trapezoidal bayonet, and a rectangular groove (24) is provided in the middle of the trapezoidal slot. The rectangular convex block (22) is embedded in the corresponding rectangular groove (24).

[0074] Experimental Example 1

[0075] Refer to the ASTM D1056 standard, and prepare the environmentally friendly, low-temperature resistant, high-strength, tough and anti-fall floor obtained in Example 1 into a cylindrical sample with a diameter of 28.6 mm. Place the sample on the compression table of a universal mechanical testing machine, and compress it to 80% of its original thickness at strain rates of 5×10 -4 s -1 、10 - 3 s -1 、10 -2 s -1 、0.8 s -1 , and record the stress-strain curve during the compression process. By observing Figure 6 , it can be known that the compression stress of the environmentally friendly, low-temperature resistant, high-strength, tough and anti-fall floor does not increase with the increase of the shear rate in the lower shear rate range, showing soft and comfortable mechanical properties; at higher shear rates, the compression stress of the floor material increases significantly, showing the mechanical properties of support and buffering. When the shear force on the high-strength and tough floor changes from slow to fast, it shows a mechanical response of changing from hard to soft, as Figure 7 shown. This characteristic can effectively buffer the reverse force on the body parts when the user falls, thus effectively reducing the risk of injury and alleviating the pain.

[0076] Refer to the EN 1621 standard to test the impact resistance of the high-strength and tough anti-fall floor. Specifically, use a 5 kg drop hammer to vertically impact the surface of the material from a height of 1 m (kinetic energy 50 J), and measure and record the impact force transmitted to the back of the sample.

[0077] Comparative Example 1

[0078] Referring to ASTM D1056 standard, a shock-absorbing gym mat (purchased from a Taobao manufacturer's store, made of EPDM rubber material) was prepared into a cylindrical sample with a diameter of 28.6 mm. The sample was placed on the compression table of a universal mechanical testing machine and compressed to 70% of its original thickness at a strain rate of 0.8 s -1 . The stress-strain curve during the compression process was recorded.

[0079] Referring to EN 1621 standard, the shock resistance performance of the shock-absorbing gym mat was tested. Specifically, a 5 kg drop hammer was used to vertically impact the material surface at a height of 1 m (kinetic energy 50 J), and the impact force transmitted to the back of the sample was measured and recorded.

[0080] Comparative Example 2

[0081] Referring to ASTM D1056 standard, a wood-grain foam mat (purchased from a Tmall flagship store, made of foamed polyethylene material) was prepared into a cylindrical sample with a diameter of 28.6 mm. The sample was placed on the compression table of a universal mechanical testing machine and compressed to 95% of its original thickness at a strain rate of 0.8 s -1 . The stress-strain curve during the compression process was recorded.

[0082] Referring to EN 1621 standard, the shock resistance performance of the shock-absorbing gym mat was tested. Specifically, a 5 kg drop hammer was used to vertically impact the material surface at a height of 1 m (kinetic energy 50 J), and the impact force transmitted to the back of the sample was measured and recorded.

[0083] The performance comparison of the environmentally friendly low-temperature resistant high-strength and tough anti-fall floor with the shock-absorbing gym mat and the wood-grain foam mat is shown in Table 1. It can be seen from Table 1 that the high-strength and tough anti-fall floor achieves the best balance between the impact absorption amount and the absorption efficiency.

[0084] Table 1:

[0085]

[0086]

[0087] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included within the protection scope of the present application.

Claims

1. An environmentally friendly, low-temperature-resistant, high-toughness, and anti-fall floor, characterized in that: The anti-fall floor is provided with a through cross groove on the back, and is composed of a plurality of sub-floors, each of which is composed of a surface layer, an intermediate layer and a bottom layer; wherein the surface layer is a polyurethane film, the intermediate layer is a polyurethane foam, and the bottom layer is a polyurethane film; The sub-floors are spliced ​​by connecting buckles, and every two adjacent sub-floors are provided with at least one set of connecting buckles at the splicing point. The connecting buckles include trapezoidal snap-ons protruding toward the outside of the floor and trapezoidal snap-ons recessed toward the inside of the floor. A rectangular protrusion is provided in the middle of each trapezoidal snap-on, and a rectangular groove is provided in the middle of each trapezoidal snap-on. The rectangular protrusion is embedded in the corresponding rectangular groove.

2. The environmentally friendly, low-temperature-resistant, high-toughness and anti-fall floor according to claim 1 is characterized in that: The polyurethane film is prepared from the following raw materials by weight: 40-70 parts of polyether TPU, 40-60 parts of polyester TPU, 0.5-3 parts of peroxide, 1-7 parts of anti-hydrolysis agent, 6-14 parts of toughening agent, 2-7 parts of compatibilizer and 0.5-3 parts of lubricant.

3. The environmentally friendly, low-temperature-resistant, high-toughness and anti-fall floor according to claim 2 is characterized in that: The water vapor permeability of the polyether TPU is 5400 g / m 2 / sky; The molecular structure of the hard segment of the polyester TPU and the polyether TPU is diphenylmethane diisocyanate, and the molecular structure of the soft segment is a combination of one or more of 3-methyl-1,5-pentanediol, N-methyldiethanolamine, butanediol, propylene glycol and ethylene glycol.

4. The environmentally friendly, low-temperature-resistant, high-toughness, and anti-fall floor according to claim 2 is characterized in that: The peroxide is a combination of one or more of the vulcanizing agent TMCH, the vulcanizing agent di-25 and tert-amyl hydroperoxide; The anti-hydrolysis agent is a combination of one or more of polycarbodiimide, N,N'-dicyclohexylcarbodiimide and bis(2,6-diisopropylbenzene)carbodiimide; The toughening agent is one or a combination of two of epoxidized natural rubber, epoxy-type acrylate rubber and styrene-butadiene-styrene rubber; The compatibilizer is one or a combination of two of polybutadiene maleic anhydride adduct, hydroxylated polybutadiene and maleic anhydride; The lubricant is a combination of one or more of oleamide, N,N'-ethylenebisoleamide, stearamide and erucamide.

5. The environmentally friendly, low-temperature-resistant, high-toughness and anti-fall floor according to claim 2 is characterized in that: The polyurethane film is prepared by the following steps: 40-70 parts of polyether TPU, 40-60 parts of polyester TPU, 0.5-3 parts of peroxide, 1-7 parts of anti-hydrolysis agent, 6-14 parts of toughening agent, 2-7 parts of compatibilizer, and 0.5-3 parts of lubricant are uniformly mixed to obtain a mixture A; The mixed material A is placed in a hot air circulation oven and baked at 90° C. to 105° C. for 6 to 12 hours to fully remove moisture, thereby obtaining a dry mixed material A; Adding the dried mixed material A into a single screw extruder, and obtaining a molten material B by melt extrusion; The molten material B is added to a film blowing machine or a casting machine to be processed into a film, and then cooled, stretched, shaped, and rolled to obtain a polyurethane film.

6. The environmentally friendly, low-temperature-resistant, high-toughness, and anti-fall floor according to claim 1 is characterized in that: The polyurethane foam is prepared from the following raw materials by weight: 90-100 parts of bio-based polyether polyol, 55-65 parts of diphenylmethane diisocyanate, 2-5 parts of foaming agent, 1-7 parts of cross-linking agent, 1-2 parts of chain extender, 0.05-0.07 parts of catalyst and 0.5-1 parts of anti-hydrolysis stabilizer.

7. The environmentally friendly, low-temperature-resistant, high-toughness, and anti-fall floor according to claim 6 is characterized in that: The bio-based polyether polyol has a bio-based content of ≥60%, a hydroxyl value of 160 mg KOH / g-185 mg KOH / g, a viscosity of 2800 cps-4000 cps at 25° C., and a density of 0.98 g / cm at 20° C. 3 -1.02g / cm 3 .

8. The environmentally friendly, low-temperature-resistant, high-toughness, and anti-fall floor according to claim 6 is characterized in that: The foaming agent is one or more of water, cyclopentane, n-pentane, isopentane, pentafluoropropane and pentafluorobutane; The cross-linking agent is one or more of ethylenediamine, N,N'-dimethylhexadecylamine and isophoronediamine; The chain extender is one or more of trimethylenediamine, trimethylolhydroxyethylethylenediamine and pentamethyldipropylenetriamine; The catalyst is one or more of bismuth isooctanoate, bismuth neodecanoate, stannous octoate and dibutyltin dilaurate; The anti-hydrolysis stabilizer is one or more of polycarbodiimide, N,N'-dicyclohexylcarbodiimide and bis(2,6-diisopropylbenzene)carbodiimide.

9. The environmentally friendly, low-temperature-resistant, high-toughness, and anti-fall floor according to claim 1, characterized in that: The thickness of the polyurethane film of the surface layer is 0.2 mm, and the thickness of the polyurethane film of the bottom layer is 0.1 mm.

10. A method for preparing the environmentally friendly, low-temperature-resistant, high-toughness and anti-fall floor as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: Fix the floor mold in a high-pressure foaming machine, then lay the polyurethane film on the bottom and top of the mold and fix it by vacuuming; evenly mix the bio-based polyether polyol, diphenylmethane diisocyanate, foaming agent, cross-linking agent, chain extender, catalyst and anti-hydrolysis stabilizer in the storage tank in the mixing head, and then transport them to the nozzle through a high-pressure pump, and cast them into the mold by the nozzle; close the mold and react under high temperature and high pressure environment for 3 minutes to 5 minutes, open the mold, and obtain an environmentally friendly, low-temperature resistant, high-strength and anti-fall floor.

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