Nano-modified EPP (Expanded Polypropylene) elastic heat-preservation and sound-insulation product and preparation method thereof

Abstract

The invention relates to the technical field of building floating floor structures, in particular to a nano-modified EPP elastic heat preservation and sound insulation product and a preparation method thereof.The product is of a plate-shaped structure and is made of a modified foamed polypropylene material, and the lower surface of the product is provided with a two-way raised grain structure used for enhancing sound insulation and adapting to unevenness of a ground base layer. Sound wave dissipation and stress adaptability are optimized through the wavy cavity structure, the sound insulation stability is improved, and the service life is prolonged; the hexagonal boron nitride nanosheets and the glass fibers are synergistically modified, so that the thermal insulation property and the mechanical strength are enhanced; a supercritical carbon dioxide foaming, zinc borate nucleating and composite flame-retardant system is adopted, so that the foam hole quality, the lasting flame retardance and the thermo-oxidative aging resistance are guaranteed; the raised grain structure on the lower surface adapts to the flatness deviation of the base layer, the construction process is simplified, the single-layer thin design integrates the sound insulation and heat preservation functions, the waterproof breathable film is compounded on the top surface, water vapor invasion is effectively blocked, and the service life of the board is prolonged. Therefore, the problems that in the prior art, the sound insulation effect does not reach the standard, the environmental protection grade is low, the function is single, construction is tedious, and house net occupation is high are solved.

Description

Technical Field

[0001] This invention relates to the field of building floating floor construction technology, specifically to a nano-modified EPP elastic thermal insulation and sound insulation product and its preparation method. Background Technology

[0002] With the continuous improvement of people's living standards and the constant upgrading of requirements for residential building quality, the sound insulation performance of floor slabs has become a core indicator for ensuring the tranquility and privacy of the living environment, directly affecting the living experience and the overall quality of the residence. Currently, relevant national and industry standards have clearly defined the impact sound insulation performance of residential floor slabs, requiring the impact sound insulation of floor slabs to reach stringent levels. Therefore, floating floor sound insulation systems have become a standard technical solution in building design to meet such sound insulation requirements.

[0003] Currently, the conventional floating floor sound insulation products on the domestic market mainly cover sound insulation mortar, cross-linked polyethylene, and rubber polyurethane. However, these products generally have many defects and are difficult to adapt to the needs of high-standard residential buildings: First, the sound insulation effect is poor. For example, the weighted standardized impact sound pressure level of cross-linked polyethylene products is generally higher than 65dB, which can no longer meet the sound insulation requirements in the current specifications. Second, the environmental performance is insufficient. Some products (such as rubber polyurethane) are often produced using recycled materials, and environmental indicators such as formaldehyde emission are difficult to meet the high standards such as E0 level. Third, the function is limited and the construction is complicated. Cross-linked polyethylene and rubber polyurethane products have high thermal conductivity and do not have independent heat insulation function. In actual projects, a "sound insulation pad + heat insulation board" superimposed construction method is required, which is not only complicated, prolongs the construction period, and increases costs, but also poses a quality risk of interlayer separation. Fourth, they encroach on indoor space. The superposition of multiple layers of materials increases the thickness of the finished floor surface, which directly affects the net height of the house and reduces the space utilization rate. Summary of the Invention

[0004] This application provides a nano-modified EPP elastic thermal insulation and sound insulation product and its preparation method to solve the problems of substandard sound insulation effect, low environmental protection level, single function and complicated construction, and encroachment on the net height of the building in the prior art.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: The present invention provides a nano-modified EPP elastic thermal insulation and sound insulation product, such as... Figure 1 As shown, the product is a plate-like structure made of modified foamed polypropylene material. The lower surface of the plate-like structure is provided with a bidirectional corrugated structure to enhance sound insulation and adapt to uneven ground surfaces.

[0006] Furthermore, the modified foamed polypropylene material comprises the following components:

[0007] Polypropylene resin: 50-80 parts;

[0008] Boron nitride nanomaterials: 1-5 parts;

[0009] Reinforcing fibers: 5-30 parts;

[0010] Nucleating agent: 1-2 parts;

[0011] Flame retardant: 5-20 parts;

[0012] Foaming agent: 1-2 parts.

[0013] Furthermore, the boron nitride nanomaterial is hexagonal boron nitride nanosheets, the reinforcing fiber is glass fiber, the nucleating agent is zinc borate, and the foaming agent is supercritical carbon dioxide.

[0014] Furthermore, the flame retardant is compounded from ammonium polyphosphate, triazine macromolecular char-forming agent and synergist in a mass ratio of (70-80):(10-20):(1-10).

[0015] Furthermore, the synergist is nano-zinc oxide, and the triazine macromolecular char-forming agent is a triazine derivative containing active amino groups.

[0016] Furthermore, the triazine derivative is a macromolecular compound having a triazine ring structure, and its molecule simultaneously contains substituents selected from C1-C3 alkylamine groups, substituents selected from nitrogen-containing heterocyclic groups, and hydrazine groups.

[0017] Furthermore, such as Figure 2 As shown, in the bidirectional wave pattern structure, the distance between adjacent wave crests in both the longitudinal and transverse directions is 40mm, the distance between wave crests and troughs is 8mm, and the wave crest cross section of the bidirectional wave pattern structure is arc-shaped.

[0018] Furthermore, the thickness of the product is 26mm to 34mm.

[0019] This application also proposes a method for preparing a nano-modified EPP elastic thermal insulation and sound insulation product, including the following steps:

[0020] S1. Polypropylene resin, boron nitride nanomaterials, reinforcing fibers, nucleating agents and flame retardants are mixed in proportion, and modified polypropylene microparticles are prepared by melt blending extrusion and granulation.

[0021] S2. The modified polypropylene microparticles are foamed once, with a foaming ratio of 15 times;

[0022] S3. The foamed beads treated in S2 are foamed a second time, with a foaming ratio of 50 times.

[0023] S4. The secondary foaming beads treated in S3 and the foaming agent are heated by steam, causing the beads to foam, expand and fuse into one piece, and then cut to form a plate-shaped foam with a bidirectional corrugated structure.

[0024] S5. The plate-shaped foam is subjected to cyclic compression and rebound treatment, wherein the compression and rebound treatment is a frequency modulation and pressure adjustment process, specifically: the plate-shaped foam is subjected to one or more compression and rebound treatments to adjust its dynamic stiffness from the initial value to the target value and its compressive strength from the initial value σ1 to the target value σ2; after one or more frequency modulation and pressure adjustment, the dynamic stiffness of the plate-shaped foam is finally placed in a specific range below 30MN / m, while its compressive strength is maintained above 20kPa;

[0025] S6. Cut the sheet-shaped foam body treated by S5 to the predetermined size, cover its upper surface with a waterproof and breathable membrane, and integrate it with the sheet body through an adhesive hot-pressing process.

[0026] This application also proposes a floating floor system, such as Figure 3 As shown, it includes:

[0027] Concrete floor slabs;

[0028] Nano-modified EPP elastic thermal insulation and sound insulation products are laid on the concrete floor slab.

[0029] A fine aggregate concrete protective layer is poured on top of the nano-modified EPP elastic thermal insulation and sound insulation product.

[0030] Vertical sound insulation panels are installed around the perimeter of the wall to isolate the fine aggregate concrete protective layer, the decorative surface layer, and the wall.

[0031] The beneficial effects achieved by using the present invention described above are as follows:

[0032] 1. This invention prepares a nano-modified EPP elastic thermal insulation and soundproofing product. Its wave-shaped cavity design forces sound waves to swirl and reflect internally, significantly extending the sound wave propagation path. Simultaneously, the contact area between sound waves and the inner walls of the wave crests and troughs, as well as the trapped air, is greatly increased. Friction is generated through air viscous resistance, efficiently converting sound energy into heat energy and dissipating it. Furthermore, the wave-shaped structure reduces the contact area between the board and the floor slab, allowing for greater local deformation under the same load, thereby lowering the material's natural frequency and providing superior isolation against common floor impact sounds such as low-frequency footsteps and furniture dragging. In terms of stress adaptability, under small loads, only the wave crests undergo elastic deformation to isolate vibrations; under large loads, the wave crests and the flat plate work together to provide sufficient support stiffness, effectively preventing material failure due to excessive deformation during long-term use, significantly improving product lifespan and sound insulation performance stability.

[0033] 2. This invention modifies the EPP matrix by introducing hexagonal boron nitride nanosheets. Leveraging the extremely high intrinsic thermal resistance of the hexagonal boron nitride nanosheets, their uniform dispersion within the polypropylene matrix creates a complex nanoscale thermal resistance network, significantly hindering heat conduction paths. Simultaneously, numerous nanosheet-polymer interfaces form highly efficient phonon scattering centers, further reducing the material's effective thermal conductivity. Glass fiber, as a macroscopic reinforcement, forms a good interfacial bond with the polypropylene matrix, efficiently transferring and dispersing stress. In the later stages of combustion, it forms a "skeleton" structure to support the char layer, preventing its cracking and collapse. Furthermore, as a non-combustible material, it does not participate in the combustion reaction, significantly improving the tensile strength, flexural strength, and impact toughness of the composite material. The nanosheets and glass fiber create a synergistic effect: the nanosheets improve the wettability of the matrix to the fiber and the interfacial bonding force, while the fiber provides spatial support for the nanosheets to prevent agglomeration, achieving a balanced improvement in both the material's rigidity and toughness.

[0034] 3. This invention uses supercritical carbon dioxide as a physical foaming agent, which dissolves in polypropylene melt under high pressure and rapidly vaporizes to form cell nuclei when the pressure drops sharply. Zinc borate, as a highly efficient nucleating agent, provides numerous heterogeneous nucleation sites in the melt through its fine particles, significantly reducing the energy barrier for cell formation and optimizing the cell structure. The flame-retardant system consists of ammonium polyphosphate, specific triazine derivatives, and nano-zinc oxide. The phosphoric acid and polyphosphoric acid produced by the thermal decomposition of ammonium polyphosphate can promote the dehydration and char formation of triazine charring agents (especially those containing hydrazine molecules), forming a dense and continuous expanded char layer that effectively isolates heat and oxygen. Nano-zinc oxide, as a synergist, can catalyze the formation of the char layer and enhance its structural stability. Crucially, the hydrazine group in the triazine charring agent molecule can efficiently capture free radicals generated by polypropylene degradation during the thermal aging process of the material, interrupting the chain degradation reaction and giving the material excellent resistance to heat and oxygen aging, ensuring a long-lasting and stable flame-retardant effect.

[0035] 4. The corrugated structure on the lower surface of the product forms a multi-point support pattern, which can adaptively absorb local elevation deviations in the base concrete slab, significantly reducing or even eliminating the need for large-area fine leveling, saving initial construction time and costs. Simultaneously, this product integrates sound insulation and thermal insulation functions; a single-layer dry-laying method can replace the traditional double-layer construction scheme of "sound insulation pad + thermal insulation board," simplifying construction procedures, improving laying efficiency, eliminating the risk of interlayer separation at the source, and significantly shortening the overall construction period.

[0036] 5. The product base material is modified polypropylene, combined with a halogen-free flame retardant system and carbon dioxide physical foaming process, with extremely low formaldehyde emission (<0.015mg / m³), and the environmental protection level reaches ENF level, meeting high environmental protection requirements; while achieving excellent sound insulation and heat insulation performance, the product thickness is controlled at 26-34mm. Under the same heat insulation and sound insulation effect, it is thinner than the traditional multi-layer construction scheme, which helps to maximize the preservation of indoor net height and improve the utilization rate and living quality of residential space.

[0037] In summary, this invention effectively solves the core problems of existing floating floor sound insulation products, such as substandard sound insulation performance, low environmental protection level, limited functionality, cumbersome construction, and encroachment on building height. Attached Figure Description

[0038] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0039] Figure 1 A schematic diagram of the nano-modified EPP elastic thermal insulation and sound insulation product provided in the embodiments of the present invention;

[0040] Figure 2 This is a schematic diagram of the bidirectional wave pattern structure provided in the embodiments of the present invention;

[0041] Figure 3 This is a schematic diagram of the floating floor system provided in the embodiments of the present invention;

[0042] Figure 4 This is a top view of the corrugated lower surface structure provided in an embodiment of the present invention;

[0043] Figure 5 A comparison chart showing the flame retardant ratings of the nano-modified EPP elastic thermal insulation and sound insulation products provided in the embodiments of the present invention;

[0044] Among them, 1-floor slab, 2-thermal insulation and sound insulation layer, 3-concrete protective layer, 4-mesh, 5-vertical sound insulation sheet, 6-wall. Detailed Implementation

[0045] The technical solution of the present invention is illustrated below through specific examples. It should be understood that the one or more method steps mentioned in the present invention do not preclude the existence of other method steps before or after the combined steps, or the insertion of other method steps between these explicitly mentioned steps; it should also be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, unless otherwise stated, the numbering of each method step is merely a convenient tool for identifying each method step, and not for limiting the order of the method steps or defining the scope of the present invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the present invention.

[0046] To better understand the above technical solutions, exemplary embodiments of the present invention are described in more detail below. While exemplary embodiments of the present invention are shown, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the invention to those skilled in the art.

[0047] The following description, with reference to the accompanying drawings, illustrates an embodiment of a nano-modified EPP elastic thermal insulation and soundproofing product and its preparation method. Addressing the issue of substandard sound insulation performance mentioned in the background section, this application provides a nano-modified EPP elastic thermal insulation and soundproofing product. In this method, the nano-modified EPP elastic thermal insulation and soundproofing product of the present invention optimizes sound wave dissipation and stress adaptability through a wave-shaped cavity structure, improving sound insulation stability and service life; it uses hexagonal boron nitride nanosheets and glass fiber for synergistic modification, enhancing thermal insulation performance and mechanical strength; it employs supercritical carbon dioxide foaming, zinc borate nucleation, and a composite flame-retardant system to ensure cell quality, long-lasting flame retardancy, and resistance to heat and oxygen aging; it utilizes a wave-patterned structure on the lower surface to adapt to substrate deviations and simplify the construction process; and it achieves ENF-level environmental standards through recyclable substrate and environmentally friendly processes. The single-layer thin design (26-34mm) integrates sound insulation and thermal insulation functions, comprehensively optimizing the overall performance of the product. In summary, this invention effectively solves the core problems of existing floating floor sound insulation products, such as substandard sound insulation performance, low environmental protection level, limited functionality, cumbersome construction, and encroachment on building height.

[0048] The present invention will be further described in conjunction with the following embodiments.

[0049] Example 1

[0050] This invention provides a nano-modified EPP elastic thermal insulation and sound insulation product, such as... Figure 1 As shown, the product has a plate-like structure made of modified foamed polypropylene material. The lower surface of the plate-like structure is provided with a two-way corrugated structure to enhance sound insulation and adapt to uneven ground surfaces.

[0051] The modified foamed polypropylene material contains the following components:

[0052] Polypropylene resin: 50 parts;

[0053] Boron nitride nanomaterials: 1 part;

[0054] Reinforcing fiber: 5 parts;

[0055] Nucleating agent: 1 part;

[0056] Flame retardant: 5 parts;

[0057] Foaming agent: 1 part.

[0058] Among them, the boron nitride nanomaterial is hexagonal boron nitride nanosheets, the reinforcing fiber is glass fiber, the nucleating agent is zinc borate, and the foaming agent is supercritical carbon dioxide.

[0059] The flame retardant is composed of ammonium polyphosphate, triazine macromolecular char-forming agent and synergist in a mass ratio of 70:10:1.

[0060] The synergist is nano zinc oxide, and the triazine macromolecular char-forming agent is a triazine derivative containing active amino groups.

[0061] Triazine derivatives are macromolecular compounds with a triazine ring structure, and their molecules contain substituents selected from C1-C3 alkylamine groups, substituents selected from nitrogen-containing heterocyclic groups, and hydrazine groups.

[0062] It should be noted that the preparation method includes the following steps, which are based on a three-step consecutive nucleophilic substitution reaction:

[0063] Step S1: Introduce an alkylamine group – synthesize a monosubstituted intermediate.

[0064] Cyanurium chloride was weighed and placed in a reaction vessel. Deionized water was added as a solvent, and triethylamine was added as an acid absorbent and catalyst. Under ice-water bath cooling and vigorous stirring, an aqueous solution of methylamine was slowly added dropwise to the reaction system. The reaction temperature was controlled within the range of 0-10°C to carry out the first-order nucleophilic substitution reaction. Under these low-temperature conditions, the most reactive chlorine atom on the cyanurium chloride molecule was selectively substituted to generate a mono(methylamino)dichlorotriazine intermediate.

[0065] Step S2: Introduce nitrogen-containing heterocyclic groups—synthesize disubstituted intermediates.

[0066] The reaction system after step S1 is slowly heated to 40-60°C. At this temperature, piperazine is added to the system. The reaction is continued under these moderate temperatures to proceed with the second-order nucleophilic substitution. At this point, the second most reactive of the two remaining chlorine atoms on the triazine ring is substituted by a piperazine group, generating an N-(methylamino)-N'-(piperazinyl)chlorotriazine disubstituted intermediate.

[0067] Step S3: Introducing hydrazine group and functionalization—synthesizing the target triazine macromolecule.

[0068] The reaction system of step S2 is further heated to 70-90℃. At this temperature, hydrazine hydrate solution is added dropwise to the system to carry out a third-order nucleophilic substitution and functionalization reaction. Under these high-temperature conditions, the last chlorine atom on the triazine ring is replaced by a hydrazine group (-NHNH2), ultimately generating a methylamino-piperazinyl-hydrazine-substituted mesitylezine macromolecular compound. By precisely controlling the molar ratio of hydrazine hydrate added in this step to piperazine added in step S2, the content of the hydrazine group in the final product molecule can be directionally controlled, thereby optimizing its free radical scavenging ability and char-forming properties.

[0069] In a particularly preferred embodiment, the molar ratio of hydrazine to piperazine is controlled at 1:5, thereby synthesizing a product (which can be referred to as CFA3 type charring agent) that achieves an optimal balance between flame retardant efficiency and aging resistance.

[0070] Step S4: Post-processing.

[0071] After the reaction was complete, the reaction mixture was cooled to room temperature, and the solid product was collected by filtration. The filter cake was repeatedly washed with deionized water until the washing liquid was neutral to thoroughly remove residual salts (such as triethylamine hydrochloride) and water-soluble impurities. The washed solid was dried in a vacuum drying oven at 60-80°C to constant weight to obtain a white to light yellow triazine macromolecular char-forming agent powder.

[0072] Among them, such as Figure 2 As shown, in the bidirectional wavy structure, the distance between adjacent wave crests in both the longitudinal and transverse directions is 40 mm, the distance between wave crests and troughs is 8 mm, and the wave crest cross section of the bidirectional wavy structure is arc-shaped.

[0073] The thickness of the product ranges from 26mm to 34mm.

[0074] This application also proposes a method for preparing a nano-modified EPP elastic thermal insulation and sound insulation product, including the following steps:

[0075] S1. Polypropylene resin, boron nitride nanomaterials, reinforcing fibers, nucleating agents and flame retardants are mixed in proportion, and modified polypropylene microparticles are prepared by melt blending extrusion and granulation.

[0076] S2. The modified polypropylene microparticles are foamed once, with a foaming ratio of 15 times;

[0077] S3. The foamed beads treated in S2 are foamed a second time, with a foaming ratio of 50 times.

[0078] S4. The secondary foaming beads treated in S3 and the foaming agent are heated by steam, causing the beads to foam, expand and fuse into one piece, and then cut to form a plate-shaped foam with a bidirectional corrugated structure.

[0079] S5. Perform cyclic compression and rebound treatment on the plate-shaped foam, wherein the compression and rebound treatment is a frequency modulation and pressure regulation process, specifically: perform one or more compression and rebound treatments on the plate-shaped foam to adjust its dynamic stiffness from the initial value to the target value, and adjust its compressive strength from the initial value σ1 to the target value σ2; after one or more frequency modulation and pressure regulation, the dynamic stiffness of the plate-shaped foam is finally placed in a specific range below 30MN / m, while its compressive strength is maintained above 20kPa;

[0080] S6. Cut the sheet-shaped foam body treated by S5 to the predetermined size, cover its upper surface with a waterproof and breathable membrane, and integrate it with the sheet body through an adhesive hot-pressing process.

[0081] This application also proposes a floating floor system, such as Figure 3 As shown, it includes:

[0082] Concrete floor slabs;

[0083] Nano-modified EPP elastic thermal insulation and sound insulation products are laid on concrete floor slabs.

[0084] A fine aggregate concrete protective layer is poured on top of the nano-modified EPP elastic thermal insulation and sound insulation product.

[0085] Vertical sound insulation panels are installed around the perimeter of the wall to isolate the fine aggregate concrete protective layer, the decorative surface layer, and the wall itself.

[0086] Specifically, from bottom to top, the structure consists of a concrete floor slab, a nano-elastic EPP integrated thermal insulation and soundproofing panel, and fine aggregate concrete. Vertical sound insulation panels are installed around the perimeter of the walls. The specific construction method is as follows:

[0087] 100~150mm thick reinforced concrete floor slab;

[0088] 26~34mm thick nano-elastic EPP thermal insulation and soundproofing integrated panel: such as Figure 4 As shown, the lower surface is provided with a bidirectional wave pattern structure, with the spacing between adjacent wave crests along the longitudinal direction and the spacing between adjacent wave crests along the transverse direction being 40mm, and the distance between wave crests and troughs being 8mm; the upper surface is covered with a 0.3mm thick waterproof and breathable membrane, which is glued to the surface of the nano-elastic EPP thermal insulation and sound insulation integrated panel.

[0089] 50mm thick fine aggregate concrete protective layer;

[0090] A 5mm thick vertical sound insulation sheet, made of foam or rubber, is installed around the perimeter of the wall to block the sound bridge between the floor and the wall / pipe.

[0091] Example 2

[0092] This invention provides a nano-modified EPP elastic thermal insulation and sound insulation product, such as... Figure 1 As shown, the product has a plate-like structure made of modified foamed polypropylene material. The lower surface of the plate-like structure is provided with a two-way corrugated structure to enhance sound insulation and adapt to uneven ground surfaces.

[0093] The modified foamed polypropylene material contains the following components:

[0094] Polypropylene resin: 56 parts;

[0095] Boron nitride nanomaterials: 2 parts;

[0096] Reinforcing fiber: 11 parts;

[0097] Nucleating agent: 1.2 parts;

[0098] Flame retardant: 8 parts;

[0099] Foaming agent: 1.2 parts.

[0100] Among them, the boron nitride nanomaterial is hexagonal boron nitride nanosheets, the reinforcing fiber is glass fiber, the nucleating agent is zinc borate, and the foaming agent is supercritical carbon dioxide.

[0101] The flame retardant is composed of ammonium polyphosphate, triazine macromolecular char-forming agent and synergist in a mass ratio of 72:12:3.

[0102] The synergist is nano zinc oxide, and the triazine macromolecular char-forming agent is a triazine derivative containing active amino groups.

[0103] Triazine derivatives are macromolecular compounds with a triazine ring structure, and their molecules contain substituents selected from C1-C3 alkylamine groups, substituents selected from nitrogen-containing heterocyclic groups, and hydrazine groups.

[0104] Among them, such as Figure 2 As shown, in the bidirectional wavy structure, the distance between adjacent wave crests in both the longitudinal and transverse directions is 40 mm, the distance between wave crests and troughs is 8 mm, and the wave crest cross section of the bidirectional wavy structure is arc-shaped.

[0105] The thickness of the product ranges from 26mm to 34mm.

[0106] The remaining preparation methods and systems are the same as in Example 1.

[0107] Example 3

[0108] This invention provides a nano-modified EPP elastic thermal insulation and sound insulation product, such as... Figure 1 As shown, the product has a plate-like structure made of modified foamed polypropylene material. The lower surface of the plate-like structure is provided with a two-way corrugated structure to enhance sound insulation and adapt to uneven ground surfaces.

[0109] The modified foamed polypropylene material contains the following components:

[0110] Polypropylene resin: 62 parts;

[0111] Boron nitride nanomaterials: 3 parts;

[0112] Reinforcing fiber: 22 parts;

[0113] Nucleating agent: 1.5 parts;

[0114] Flame retardant: 12 parts;

[0115] Foaming agent: 1.5 parts.

[0116] Among them, the boron nitride nanomaterial is hexagonal boron nitride nanosheets, the reinforcing fiber is glass fiber, the nucleating agent is zinc borate, and the foaming agent is supercritical carbon dioxide.

[0117] The flame retardant is composed of ammonium polyphosphate, triazine macromolecular char-forming agent and synergist in a mass ratio of 75:15:5.

[0118] The synergist is nano zinc oxide, and the triazine macromolecular char-forming agent is a triazine derivative containing active amino groups.

[0119] Triazine derivatives are macromolecular compounds with a triazine ring structure, and their molecules contain substituents selected from C1-C3 alkylamine groups, substituents selected from nitrogen-containing heterocyclic groups, and hydrazine groups.

[0120] Among them, such as Figure 2 As shown, in the bidirectional wavy structure, the distance between adjacent wave crests in both the longitudinal and transverse directions is 40 mm, the distance between wave crests and troughs is 8 mm, and the wave crest cross section of the bidirectional wavy structure is arc-shaped.

[0121] The thickness of the product ranges from 26mm to 34mm.

[0122] The remaining preparation methods and systems are the same as in Example 1.

[0123] Example 4

[0124] This invention provides a nano-modified EPP elastic thermal insulation and sound insulation product, such as... Figure 1 As shown, the product has a plate-like structure made of modified foamed polypropylene material. The lower surface of the plate-like structure is provided with a two-way corrugated structure to enhance sound insulation and adapt to uneven ground surfaces.

[0125] The modified foamed polypropylene material contains the following components:

[0126] Polypropylene resin: 70 parts;

[0127] Boron nitride nanomaterials: 4 parts;

[0128] Reinforcing fiber: 26 parts;

[0129] Nucleating agent: 1.8 parts;

[0130] Flame retardant: 15 parts;

[0131] Foaming agent: 1.8 parts.

[0132] Among them, the boron nitride nanomaterial is hexagonal boron nitride nanosheets, the reinforcing fiber is glass fiber, the nucleating agent is zinc borate, and the foaming agent is supercritical carbon dioxide.

[0133] The flame retardant is composed of ammonium polyphosphate, triazine macromolecular char-forming agent and synergist in a mass ratio of 78:18:8.

[0134] The synergist is nano zinc oxide, and the triazine macromolecular char-forming agent is a triazine derivative containing active amino groups.

[0135] Triazine derivatives are macromolecular compounds with a triazine ring structure, and their molecules contain substituents selected from C1-C3 alkylamine groups, substituents selected from nitrogen-containing heterocyclic groups, and hydrazine groups.

[0136] Among them, such as Figure 2 As shown, in the bidirectional wavy structure, the distance between adjacent wave crests in both the longitudinal and transverse directions is 40 mm, the distance between wave crests and troughs is 8 mm, and the wave crest cross section of the bidirectional wavy structure is arc-shaped.

[0137] The thickness of the product ranges from 26mm to 34mm.

[0138] The remaining preparation methods and systems are the same as in Example 1.

[0139] Example 5

[0140] This invention provides a nano-modified EPP elastic thermal insulation and sound insulation product, such as... Figure 1 As shown, the product has a plate-like structure made of modified foamed polypropylene material. The lower surface of the plate-like structure is provided with a two-way corrugated structure to enhance sound insulation and adapt to uneven ground surfaces.

[0141] The modified foamed polypropylene material contains the following components:

[0142] Polypropylene resin: 80 parts;

[0143] Boron nitride nanomaterials: 5 parts;

[0144] Reinforcing fiber: 30 parts;

[0145] Nucleating agent: 2 parts;

[0146] Flame retardant: 20 parts;

[0147] Foaming agent: 2 parts.

[0148] Among them, the boron nitride nanomaterial is hexagonal boron nitride nanosheets, the reinforcing fiber is glass fiber, the nucleating agent is zinc borate, and the foaming agent is supercritical carbon dioxide.

[0149] The flame retardant is composed of ammonium polyphosphate, triazine macromolecular char-forming agent and synergist in a mass ratio of 80:20:10.

[0150] The synergist is nano zinc oxide, and the triazine macromolecular char-forming agent is a triazine derivative containing active amino groups.

[0151] Triazine derivatives are macromolecular compounds with a triazine ring structure, and their molecules contain substituents selected from C1-C3 alkylamine groups, substituents selected from nitrogen-containing heterocyclic groups, and hydrazine groups.

[0152] Among them, such as Figure 2 As shown, in the bidirectional wavy structure, the distance between adjacent wave crests in both the longitudinal and transverse directions is 40 mm, the distance between wave crests and troughs is 8 mm, and the wave crest cross section of the bidirectional wavy structure is arc-shaped.

[0153] The thickness of the product ranges from 26mm to 34mm.

[0154] The remaining preparation methods and systems are the same as in Example 1.

[0155] Comparative Example 1: Traditional Floating Floor Construction

[0156] This comparative model simulates the conventional floating floor structure widely used in the market, serving as a benchmark for comparison in the embodiments of this invention.

[0157] The constructor is as follows:

[0158] Substrate preparation: Level the entire 100-150mm thick cast-in-place reinforced concrete slab.

[0159] Laying a sound insulation layer: Lay a 10mm thick cross-linked polyethylene (XPE) foam sound insulation pad;

[0160] Laying the insulation layer: Lay a 20mm thick extruded polystyrene board (XPS) on the sound insulation pad as the insulation layer;

[0161] System protective layer: Lay crack-resistant mesh cloth and pour a 50mm thick C20 fine stone concrete protective layer;

[0162] Sound bridge partition: 5mm thick vertical sound insulation foam sheets are installed around the perimeter of the wall.

[0163] Comparative Example 2: Conventional Floating Floor Structure

[0164] This comparative model simulates the conventional floating floor structure widely used in the market, serving as a benchmark for comparison in the embodiments of this invention.

[0165] The constructor is as follows:

[0166] Substrate preparation: Level the entire 100-150mm thick cast-in-place reinforced concrete slab.

[0167] Laying a sound insulation layer: Lay a 10mm thick rubber polyurethane sound insulation pad;

[0168] Laying the insulation layer: Lay a 20mm thick extruded polystyrene board (XPS) on the sound insulation pad as the insulation layer;

[0169] System protective layer: Lay crack-resistant mesh cloth and pour a 50mm thick C20 fine stone concrete protective layer;

[0170] Sound bridge partition: 5mm thick vertical sound insulation foam sheets are installed around the perimeter of the wall.

[0171] Comparative Example 3: EPP sheet material with only a flat panel structure

[0172] The formulation of the sheet material is the same as in Example 1, but the lower surface is planar. Preparation method: The same formulation and preparation process as in Example 1 are used, but the lower cavity of the molding die is a smooth plane to obtain a flat modified EPP sheet with a thickness of 30 mm.

[0173] Performance testing

[0174] To verify the overall performance of the products (or structural systems) prepared in this invention (Examples 1-5) and Comparative Examples 1-3, performance tests were conducted according to relevant national and industry standards. The test results are shown in Table 1 below.

[0175] Table 1 Performance Tests

[0176] Sound insulation performance (dB) Thermal insulation performance (W / (m K)) Tensile strength retention rate (%) Example 1 53 0.031 89 Example 2 52 0.033 90 Example 3 50 0.034 91 Example 4 48 0.035 92 Example 5 52 0.032 91 Comparative Example 1 68 0.045 75 Comparative Example 2 58 0.068 88 Comparative Example 3 54 0.035 65

[0177] As shown in Table 1, the weighted standardized impact sound pressure level of the products in each embodiment of the present invention is controlled at 48-53dB. Compared with Comparative Example 1 (68dB) and Comparative Example 2 (62dB), the sound insulation performance is significantly better than that of existing products and fully meets the requirements of current specifications. In terms of thermal insulation performance, the thermal conductivity of the products in the embodiments is as low as 0.031-0.035W / (m·K), which is the same as or even better than that of the comparative examples, achieving synergistic optimization of sound insulation and thermal insulation performance. The tensile strength retention rate is 89%-92%, far exceeding that of Comparative Example 3 (65%) and Comparative Example 1 (75%), showing better mechanical stability and durability.

[0178] Depend on Figure 5 It can be seen that the flame retardant performance of the products in each embodiment of the present invention is excellent and stable, all within the relatively high range of 30%-33%. Among them, the limiting oxygen index of Example 4 is the highest (33%), showing its optimal flame retardant performance. In the comparative examples, the values ​​of Comparative Example 1 (24%) and Comparative Example 2 (27%) are significantly lower, with only Comparative Example 3 (31%) being comparable to some of the embodiments. In terms of flame retardant rating, the LOI of all embodiments is ≥31.0%, and all meet the highest standard of UL-94 V-0, achieving a substantial leap from Comparative Example 1 "not reaching V-0 rating", Comparative Example 3 "V-1 rating" to the "full V-0 rating" of the embodiments of the present invention. Although Comparative Example 2 reaches V-0 rating, its performance is still inferior to that of Examples 3 and 4.

[0179] Based on the data in Table 1, the weighted normalized impact sound pressure level of each embodiment of the present invention is controlled at 48–53 dB, the thermal conductivity is as low as 0.031–0.035 W / (m·K), and the tensile strength retention rate reaches 89%–92%. This indicates that the present invention optimizes flame retardant performance while also taking into account sound insulation, thermal insulation, and mechanical stability, and its overall performance comprehensively surpasses that of existing products.

[0180] This application provides a nano-modified EPP elastic thermal insulation and sound insulation product. In this method, the nano-modified EPP elastic thermal insulation and sound insulation product of the present invention optimizes sound wave dissipation and stress adaptability through a wave-shaped cavity structure, improving sound insulation stability and service life; it uses hexagonal boron nitride nanosheets and glass fiber for synergistic modification to enhance thermal insulation performance and mechanical strength; it employs supercritical carbon dioxide foaming, zinc borate nucleation, and a composite flame-retardant system to ensure cell quality, long-lasting flame retardancy, and resistance to heat and oxygen aging; it utilizes a wave-patterned structure on the lower surface to adapt to substrate deviations and simplify the construction process; and it achieves ENF-level environmental standards with environmentally friendly substrates and processes. The single-layer thin design (26-34mm) integrates sound insulation and thermal insulation functions, comprehensively optimizing the overall performance of the product. In summary, the present invention effectively solves the core problems of existing floating floor sound insulation products, such as substandard sound insulation effects, low environmental protection levels, limited functionality, cumbersome construction, and encroachment on building height.

[0181] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A nano-modified EPP elastic thermal insulation and sound insulation product, characterized in that, The product is a plate-like structure made of modified foamed polypropylene material. The lower surface of the plate-like structure is provided with a bidirectional corrugated structure to enhance sound insulation and adapt to uneven ground surfaces.

2. The nano-modified EPP elastic thermal insulation and soundproofing product according to claim 1, characterized in that, The modified foamed polypropylene material comprises the following components: Polypropylene resin: 50-80 parts; Boron nitride nanomaterials: 1-5 parts; Reinforcing fibers: 5-30 parts; Nucleating agent: 1-2 parts; Flame retardant: 5-20 parts; Foaming agent: 1-2 parts.

3. The nano-modified EPP elastic thermal insulation and sound insulation product according to claim 2, characterized in that, The boron nitride nanomaterial is hexagonal boron nitride nanosheets, the reinforcing fiber is glass fiber, the nucleating agent is zinc borate, and the foaming agent is supercritical carbon dioxide.

4. The nano-modified EPP elastic thermal insulation and sound insulation product according to claim 2, characterized in that, The flame retardant is composed of ammonium polyphosphate, triazine macromolecular char-forming agent and synergist in a mass ratio of (70-80):(10-20):(1-10).

5. The nano-modified EPP elastic thermal insulation and sound insulation product according to claim 4, characterized in that, The synergist is nano zinc oxide, and the triazine macromolecular char-forming agent is a triazine derivative containing active amino groups.

6. The nano-modified EPP elastic thermal insulation and soundproofing product according to claim 5, characterized in that, The triazine derivative is a macromolecular compound with a triazine ring structure, and its molecule contains substituents selected from C1-C3 alkylamine groups, substituents selected from nitrogen-containing heterocyclic groups, and hydrazine groups.

7. The nano-modified EPP elastic thermal insulation and soundproofing product according to claim 1, characterized in that, In the bidirectional wave pattern structure, the distance between adjacent wave crests in both the longitudinal and transverse directions is 40 mm, the distance between wave crests and troughs is 8 mm, and the wave crest cross section of the bidirectional wave pattern structure is arc-shaped.

8. The nano-modified EPP elastic thermal insulation and sound insulation product according to claim 1, characterized in that, The thickness of the product is 26mm to 34mm.

9. A method for preparing a nano-modified EPP elastic thermal insulation and soundproofing product as described in any one of claims 1 to 8, characterized in that, Includes the following steps: S1. Polypropylene resin, boron nitride nanomaterials, reinforcing fibers, nucleating agents and flame retardants are mixed in proportion, and modified polypropylene microparticles are prepared by melt blending extrusion and granulation. S2. The modified polypropylene microparticles are foamed once, with a foaming ratio of 15 times; S3. The foamed beads treated in S2 are foamed a second time, with a foaming ratio of 50 times. S4. The secondary foaming beads treated in S3 and the foaming agent are heated by steam, causing the beads to foam, expand and fuse into one piece, and then cut to form a plate-shaped foam with a bidirectional corrugated structure. S5. The plate-shaped foam is subjected to cyclic compression and rebound treatment, wherein the compression and rebound treatment is a frequency modulation and pressure adjustment process, specifically: the plate-shaped foam is subjected to one or more compression and rebound treatments to adjust its dynamic stiffness from the initial value to the target value and its compressive strength from the initial value σ1 to the target value σ2; after one or more frequency modulation and pressure adjustment, the dynamic stiffness of the plate-shaped foam is finally placed in a specific range below 30MN / m, while its compressive strength is maintained above 20kPa; S6. Cut the sheet-shaped foam body treated by S5 to the predetermined size, cover its upper surface with a waterproof and breathable membrane, and integrate it with the sheet body through an adhesive hot-pressing process.

10. A floating floor system, characterized in that, include: Concrete floor slabs; The nano-modified EPP elastic thermal insulation and sound insulation product as described in any one of claims 1 to 9 is laid on the concrete floor slab; A fine aggregate concrete protective layer is poured on top of the nano-modified EPP elastic thermal insulation and sound insulation product. Vertical sound insulation panels are installed around the perimeter of the wall to isolate the fine aggregate concrete protective layer, the decorative surface layer, and the wall.

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