Sound absorption sticker for beautifying sound barrier and preparation process of sound absorption sticker

Abstract

The invention belongs to the technical field of sound barriers, and discloses a sound absorption sticker for beautifying a sound barrier and a preparation process thereof, the preparation process comprises the following steps: S1, preparation of a sound absorption layer: weighing fly ash, slag, a foaming agent and a binder in proportion, uniformly dry-mixing, adding water, and uniformly stirring to obtain uniform slurry; injecting the slurry into a mold, foaming and curing to obtain a porous ceramic base material; cooling, cutting into standard size, and polishing the surface; s2, preparation of a protective layer: casting the modified polypropylene melt into a film through a roll-to-roll production line, and irradiating under ultraviolet light to form a wear-resistant matte surface, so as to obtain the protective layer; s3, compounding the absorbing layer and the protective layer, namely uniformly coating the composite adhesive on the back surface of the sound absorbing layer, compounding the protective layer and the sound absorbing layer through a hot pressing roller, cooling and rolling to obtain the sound absorbing sticker; the problems that an existing sound barrier is narrow in sound absorption frequency band, poor in attractiveness and high in beautifying cost are solved.

Description

Technical Field

[0001] This invention relates to the field of sound barrier technology, specifically to a sound-absorbing sticker for beautifying sound barriers and its preparation process. Background Technology

[0002] A sound barrier is a structure specifically designed to reduce the propagation of noise. It is typically installed between a noise source and an area requiring protection, such as near highways, railways, or industrial facilities, to reduce the impact of noise generated in these locations on the surrounding environment. Sound barriers work on the principle of sound wave absorption and reflection, using sound-absorbing materials and reflective surfaces to reduce noise levels. The main components of a sound barrier include steel structural columns and sound barriers. The steel columns serve as the primary supporting structure and are fixed by bolts or welding; the sound barriers are secured to the columns by high-strength spring clips. Materials include, but are not limited to, concrete, steel, wood, and various composite materials.

[0003] However, existing sound barriers can obstruct the roadside scenery, making passengers feel depressed and monotonous when passing through such sections. If transparent materials are used, they can easily cause glare and reflections, and require frequent cleaning. General sound barrier beautification methods require frequent maintenance or the installation of new sound barriers, which is costly in terms of labor and materials and difficult to apply widely. In addition, sound barriers have a narrow sound absorption frequency band and poor sound absorption effect. Summary of the Invention

[0004] The present invention aims to provide a sound-absorbing sticker for beautifying sound barriers and its manufacturing process, which solves the problems of narrow sound absorption frequency band, poor aesthetics and high beautification cost of existing sound barriers.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A process for preparing sound-absorbing stickers for beautifying sound barriers includes the following steps:

[0007] S1. Preparation of the sound-absorbing layer

[0008] Weigh out fly ash, slag, foaming agent, and binder in proportion, dry mix them evenly, add water and stir evenly to obtain a uniform slurry; pour the slurry into a mold, foam and solidify to obtain a porous ceramic substrate; after cooling, cut it to standard size and polish the surface;

[0009] S2. Preparation of the protective layer

[0010] Modified polypropylene melt is cast into a film through a roll-to-roll production line, and then irradiated under ultraviolet light to form a wear-resistant matte surface, thus obtaining a protective layer.

[0011] S3, Composite of Absorbent Layer and Protective Layer

[0012] The composite adhesive is evenly applied to the back of the sound-absorbing layer. The protective layer and the sound-absorbing layer are then bonded together using a hot press roller. After cooling, the layers are rolled up to obtain the sound-absorbing sticker.

[0013] Furthermore, in S1, the weight ratio of fly ash, slag, foaming agent, binder, and water is: 40 parts: 20 parts: 5 parts: 10 parts: 25 parts.

[0014] Furthermore, in S1, the foaming and curing process conditions are foaming and curing at 80°C and 0.5MPa for 30 minutes.

[0015] Furthermore, in S2, the raw materials for the modified polypropylene melt include polypropylene, nano-silica, and inorganic mineral pigments, and the weight ratio of polypropylene, nano-silica, and inorganic mineral pigments is 100 parts: 3 parts: 2 parts.

[0016] Furthermore, in S2, the ultraviolet light intensity is 100 mW / cm². 2 The irradiation time is 10 seconds.

[0017] Furthermore, in S3, the temperature of the hot press roller composite is 80°C and the pressure is 0.3 MPa.

[0018] Furthermore, in S3, the composite adhesive comprises recycled rubber powder, aqueous acrylic emulsion, tackifying resin and deionized water, and the weight ratio of recycled rubber powder, aqueous acrylic emulsion, tackifying resin and deionized water is 50 parts: 30 parts: 10 parts: 10 parts.

[0019] The sticker is prepared according to the above-described sound-absorbing sticker preparation process for beautifying sound barriers.

[0020] The principles and beneficial effects of the technical solution are as follows:

[0021] This invention provides a sound-absorbing sticker for beautifying sound barriers and its manufacturing process. Through a composite sound absorption mechanism and the selection of engineered materials, it achieves a wide sound absorption frequency band, thereby improving noise reduction. It can also adapt to different sound barrier shapes without modifying the original structure, preserving the original function of the sound barrier to the greatest extent. Furthermore, different patterns and styles can be chosen for beautifying the sound barrier, facilitating design that integrates with local characteristics and blends into the surrounding environment. This enhances the function of the original sound barrier while also beautifying it. The sticker is made from recyclable materials and industrial byproducts, reducing material costs and beautification costs, making it suitable for large-scale promotion.

[0022] Specifically, the sound-absorbing layer is made of porous ceramic (sound-absorbing layer) based on industrial waste residue, with fly ash and slag accounting for ≥60%. The sound-absorbing layer substrate is manufactured through a foaming molding process. The gradient pore size broadens the frequency band with a sound absorption coefficient α≥0.6 to 200-800Hz (traditional single-pore size only covers 300-600Hz). The three-layer structure (protective layer, sound-absorbing layer, adhesive layer) further enhances the sound insulation function of the sound barrier. The surface protective layer can withstand 10MPa high-pressure water washing, reducing maintenance costs by 70%. Surface protection is achieved using UV-cured modified polypropylene (PP) film, with an inorganic mineral pigment UV-cured coating (Pantone color card coverage ≥95%), ensuring high color fidelity (ΔE≤1.5 after 5 years of outdoor aging), durability, and a significant aesthetic effect. Patterns can be designed according to actual needs, and a matte film covering helps reduce reflection, further enhancing the visual effect. Made with environmentally friendly materials, scraps are crushed and reused as pore-forming agents (≤15%), reducing raw material consumption by 20%. Products that have reached the end of their service life can also be recycled for manufacturing, saving costs and being environmentally friendly. Taking the sound-absorbing layer as an example, waste materials are ground and mixed into new materials as pore-forming agents, reducing fly ash procurement by 23%. The dust collection rate during manufacturing is ≥95%, effectively avoiding secondary pollution. In addition, a water-based acrylic / recycled rubber composite adhesive has been developed as an adhesive layer, using recycled rubber to reduce costs. During installation, simply clean the sound barrier and then stick it on. The use of stickers with pre-coated magnetic adhesive strips makes the operation more convenient—align → press → complete. A single piece takes 1.2 minutes (compared to 5 minutes for a standard solution), making installation convenient and efficient. The peelable design ensures that the adhesive residue rate is ≤5%, leaving almost no residue after removal. Damaged parts can also be replaced individually, and the surface PP film can withstand 10MPa high-pressure water washing, making maintenance convenient and cost-effective. The integrated molding process improves efficiency: the protective layer coating, sound-absorbing layer molding, and adhesive layer pre-coating are completed on a single production line. The electronic-grade R2R (roll to roll) production line is used to achieve a high-speed coating of 5 meters per minute. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the embodiments:

[0024] Example 1

[0025] A process for preparing sound-absorbing stickers for beautifying sound barriers includes the following steps:

[0026] S1. Preparation of the sound-absorbing layer

[0027] (1) Mixing: Weigh 40 parts fly ash, 20 parts slag, 5 parts foaming agent, 10 parts binder and 25 parts water according to the weight ratio. Dry mix the weighed fly ash, slag, foaming agent and binder for 5 minutes, add the weighed water and stir evenly to obtain a uniform slurry. Among them, the foaming agent is sodium bicarbonate and the binder is silica sol. A small amount of citric acid can be added to the sodium bicarbonate foaming agent. The weight ratio of sodium bicarbonate to citric acid is 5 parts: 1.0 to 2.0 parts, accounting for 1% to 2% of the total weight of the formula, to neutralize the residual sodium carbonate and avoid the alkalinity affecting the binder.

[0028] (2) Foaming molding: The slurry is injected into the mold and foamed and cured for 30 minutes at 80℃ and 0.5MPa to form a porous ceramic substrate;

[0029] (3) Cutting: After cooling, the porous ceramic substrate is cut into standard dimensions of 300mm×600mm, and the surface is polished to a roughness Ra≤10μm. The scraps after cutting are ground and then added to the new material in (1) as a pore-forming agent; the remixing ratio is ≤15% (experiments have shown that exceeding 15% will lead to a decrease of ≥20% in the compressive strength of the sound-absorbing layer). Remixing method: The scraps after cutting are crushed → sieved (particle size ≤1mm) → added to the new material in proportion. Among them, the sound absorption coefficient (α≥0.6) and compressive strength (≥3.5MPa) need to be tested before each batch of remixing.

[0030] Performance assurance: The product after re-doping must pass the following tests:

[0031] Sound absorption performance: α value fluctuation ≤ 5% (compared to samples without backmixing).

[0032] Durability: No delamination after 100 high-pressure water washes.

[0033] (2) Waste recycling and disposal (emphasis on environmental protection)

[0034] Recyclable waste materials: production scraps, and intact stickers after removal (recycled after grinding).

[0035] Waste materials that cannot be recycled: heavily contaminated old stickers → are sent to rubber recycling plants for pyrolysis treatment, in accordance with GB 16297 standards.

[0036] VOC emissions from the adhesive layer ≤50mg / m³ 3 It meets the standards of GB 30982-2014.

[0037] S2. Preparation of the protective layer

[0038] (1) Casting: Modified polypropylene melt is cast into a film with a thickness of 0.2 mm through an R2R (roll to roll) production line;

[0039] The preparation method of modified polypropylene melt and its roll-to-roll casting method are as follows:

[0040] Step 1: Raw material pretreatment:

[0041] Take 100 parts of polypropylene granules and dry them in an oven at 80℃ for 4 hours. The moisture content should be ≤0.1% to avoid generating bubbles during melting.

[0042] Take 3 parts of nano-silica (matte agent) and pre-modify its surface with silane coupling agent (KH550) to improve its compatibility with polypropylene.

[0043] Take 2 parts of inorganic mineral pigment, customized according to the Pantone color chart, with a particle size ≤5μm, sieve and premix with UV curing agent.

[0044] Step 2: Mixing and melting of pretreated raw materials:

[0045] Equipment: Twin-screw extruder (L / D = 40:1, zoned temperature control).

[0046] Process parameters: Temperature gradient: 180℃ (feed section) → 200℃ (melting section) → 190℃ (die section). Rotation speed: 200 rpm.

[0047] The feeding sequence is as follows: First, add polypropylene granules to the main feed port; then add nano-silica, inorganic pigments, and UV curing agent (acrylate, 5 parts) to the side feed port (to prevent high-temperature decomposition), and melt them to obtain modified polypropylene melt.

[0048] Step 3: Casting and film formation:

[0049] Equipment: Roll-to-roll (R2R) casting machine.

[0050] The roll-to-roll casting process parameters are shown in Table 1:

[0051] Table 1. Roll-to-roll casting process parameters

[0052] index parameter melt temperature 190℃ Die head gap 0.5mm Traction speed 10m / min Cooling roller temperature 25℃ Film thickness 0.2mm (±0.02mm)

[0053] (2) UV curing: Under UV light intensity of 100mW / cm 2 After being irradiated for 10 seconds, a wear-resistant matte surface is formed, resulting in a protective layer.

[0054] Equipment: UV curing chamber (mercury lamp, wavelength 365nm), UV curing process parameters are shown in Table 2:

[0055] Table 2 UV Curing Process Parameters

[0056]

[0057] The quality of the prepared protective layer was tested, and the results are as follows:

[0058] Color consistency: ΔE ≤ 1.0 as measured by spectrophotometer (compared with Pantone color chart).

[0059] Abrasion resistance: According to ASTM D4060 standard, the mass loss after 500 cycles of friction is ≤0.5%.

[0060] Adhesion: Cross-cut adhesion test (ISO 2409) grade 0 (no peeling).

[0061] Among them, the key process control points to note are:

[0062] 1. Dispersion uniformity: Nano-silica and pigments need to be premixed into the polypropylene matrix to avoid agglomeration.

[0063] 2. UV curing depth: By adjusting the light intensity and time, ensure that the film surface is completely cross-linked.

[0064] 3. Matte agent ratio: Nano silica exceeding 3% may lead to increased brittleness, and a balance needs to be struck between the matte effect and mechanical properties.

[0065] The specifications and functions of polypropylene granules, nano-silica, inorganic mineral pigments, and UV curing agents are shown in Table 3.

[0066] Table 3 Specifications and Functions of Polypropylene Particles, Nano-Silica, Inorganic Mineral Pigments, and UV Curing Agents

[0067]

[0068] Through the above process, the protective layer can achieve high wear resistance, a matte surface, and precise color, meeting the aesthetic and functional requirements of sound barriers.

[0069] S3, Composite of Absorbent Layer and Protective Layer

[0070] 1. Apply adhesive: Use a scraper or spraying equipment to evenly apply water-based acrylic / recycled rubber composite adhesive to the back of the sound-absorbing layer. The adhesive layer thickness is 0.1mm (±0.02mm).

[0071] The formulation and preparation method of the water-based acrylic / reclaimed rubber composite adhesive (adhesive layer) adopts the following step-by-step process to ensure uniform material dispersion and stable performance:

[0072] Formula ratio (parts by weight):

[0073] Reclaimed rubber powder (80 mesh): 50 parts

[0074] Water-based acrylic emulsion: 30 parts

[0075] Tackifying resin (rosin derivative): 10 parts

[0076] Deionized water: 10 parts

[0077] Preparation method:

[0078] Step 1: Raw material pretreatment

[0079] (1) Processing of recycled rubber powder: sieve (80 mesh) to remove lumps or impurities; dry in an oven at 60℃ for 2 hours, controlling the moisture content to ≤1%.

[0080] (2) Tackifying resin treatment: Solid resin is crushed to a particle size ≤100μm; liquid resin is used directly.

[0081] Step 2: Mixing the pretreated raw materials

[0082] (1) Initial mixing: Add the recycled rubber powder and tackifying resin to the mixing tank and mix at low speed (200 rpm, 5 minutes) to ensure initial dispersion.

[0083] (2) Adding emulsion and solvent:

[0084] Slowly add the aqueous acrylic emulsion and deionized water, gradually increasing the speed to 800 rpm, and mix for 15 minutes. Maintain a temperature ≤40℃ (to prevent emulsion breakage), using an anchor or serrated agitator.

[0085] (3) Homogenization: Further homogenization was carried out using a high-shear emulsifier (3000 rpm, 10 minutes) to eliminate bubbles and particle agglomeration.

[0086] Step 3: Viscosity Adjustment and Filtration:

[0087] (1) Depending on the construction requirements, a small amount of ammonia water can be added to adjust the pH to 8-9 (to enhance stability).

[0088] (2) Filter through a 200-mesh filter to remove undispersed rubber particles or impurities to obtain a composite adhesive.

[0089] (3) The prepared composite adhesive is sealed and stored away from light at a temperature of 10-30℃, and has a shelf life of 3 months.

[0090] 2. Lamination: The protective layer and the sound-absorbing layer are laminated by a hot press roller (temperature 80℃, pressure 0.3MPa), cooled and then rolled up to obtain the sound-absorbing sticker.

[0091] Utilizing recycled rubber powder and a water-based system, this method meets environmental protection requirements and has low energy consumption. It is suitable for roll-to-roll (R2R) coating lines, meeting high-speed production needs (e.g., coating speed of 5 meters per minute). This method ensures the adhesive layer possesses high bond strength, weather resistance, and ease of application, making it suitable for the industrial production needs of sound barrier stickers.

[0092] To increase the adhesion, lifespan, and effectiveness of stickers, the following conditions must be met when applying them:

[0093] 1. Surface cleanliness

[0094] Dust / oil stains: Rinse with a high-pressure water gun (≥5MPa) and sand with 80-grit sandpaper to ensure that the surface is free of loose particles and oil stains.

[0095] 2. Ambient temperature and humidity

[0096] Temperature: 5℃~40℃ (the adhesive will not cure below 5℃ and may fail prematurely above 40℃), relative humidity: ≤80% (construction is prohibited in rainy or sunny weather).

[0097] In winter, use a hot air gun to preheat the substrate to above 10°C before applying it.

[0098] 3. Substrate flatness

[0099] Slight unevenness is permissible, but the height difference must be ≤2mm / ㎡ (if it exceeds this, cement mortar leveling is required).

[0100] Inspection method: Place a 1-meter straightedge on it; the gap should be ≤3mm.

[0101] 4. Activation conditions of the adhesive layer

[0102] When hot press rollers are combined, the roller temperature should be 80℃±5℃ and the pressure should be 0.3MPa.

[0103] 5. Curing time

[0104] After application, it needs to stand for 24 hours before it can withstand pressure (such as wind and water).

[0105] In emergencies, infrared lamp baking (60℃) can be used to shorten the time to 4 hours, but the intensity will decrease by 10%.

[0106] 6. Failure Recovery

[0107] If the adhesive is misaligned or bubbles form, it can be peeled off and reapplied within 24 hours (if the adhesive is not fully cured). If it has been more than 24 hours, a heat gun at 150°C should be used to locally heat the adhesive layer to soften it before peeling it off.

[0108] Example 2

[0109] The difference between this embodiment and Embodiment 1 is that diatomaceous earth or glass powder is used instead of nano-silica, and no silane coupling agent modification is required; it is directly blended with the polypropylene melt to save steps. The extruder speed needs to be increased (250 rpm → 300 rpm) to ensure uniform dispersion. A surface embossing process can also be added to enhance the matte finish. The UV curing time needs to be extended (10 seconds → 15 seconds) or an acrylic coating needs to be added. The sticker obtained in this embodiment has a sound absorption coefficient α fluctuation ≤ 0.05 compared to Embodiment 1, and the diatomaceous earth or glass powder materials are less expensive, resulting in significant cost savings.

[0110] Example 3

[0111] The difference between this embodiment and Example 1 is that precipitated silica (non-nano) is used instead of nano-silica, added at 5%, meaning the total amount of silica is 5 parts. The UV curing time needs to be extended (10 seconds → 15 seconds) or an acrylic coating needs to be added. The sticker prepared in this embodiment has a sound absorption coefficient α fluctuation ≤0.05 compared to Example 1, and the price of silica material is lower, which can significantly reduce costs.

[0112] Table 4 shows a comparison of the cost and performance of the reinforcing materials in Examples 1, 2, and 3:

[0113] Table 4. Comparison of Cost and Performance of Various Reinforcing Materials

[0114]

[0115] Table 5 shows a comparison of the cost-effectiveness and sound absorption coefficients of the reinforcing materials in Examples 1, 2, and 3:

[0116] Table 5. Comparison of cost-effectiveness and sound absorption coefficient of various reinforcing materials.

[0117]

[0118] From Tables 4 and 5, we can conclude that:

[0119] The best cost-effective reinforcing material: diatomaceous earth (improves sound absorption performance and reduces costs by 80%).

[0120] Extremely low-cost reinforcing material: recycled glass powder (suitable for projects with tight budgets).

[0121] The alternative materials still need to meet the requirements for scrap material recycling (particle size ≤ 1mm).

[0122] Comparative Example 1

[0123] The difference between this comparative example and Example 1 is as follows: S1. Preparation of the sound-absorbing layer (1) Mixing: Weigh 30 parts of fly ash, 30 parts of slag, 5 parts of foaming agent, 10 parts of binder, and 25 parts of water according to the weight ratio. Dry mix the weighed fly ash, slag, foaming agent, and binder for 5 minutes, add the weighed water and stir evenly to obtain a uniform slurry. Among them, the foaming agent is sodium bicarbonate, the binder is silica sol, and a small amount of citric acid can be added to the sodium bicarbonate foaming agent. The weight ratio of sodium bicarbonate to citric acid is 5 parts: 1.0~2.0 parts, accounting for 1%~2% of the total weight of the formula, to neutralize the residual sodium carbonate and avoid the alkalinity affecting the binder. The remaining steps are the same as in Example 1, and will not be repeated here.

[0124] The stickers prepared in Example 1 and Comparative Example 1 were tested, and the experimental data are as follows:

[0125] (1) The test results of the sound absorption performance of the sticker in Example 1 are shown in Table 4 (based on ISO 354 standard):

[0126] Table 4. Test results of the sound absorption performance of the sticker in Example 1

[0127] Frequency (Hz) Sound absorption coefficient α (Example 1) Traditional single-pore material α 200 0.62 0.18 400 0.78 0.55 600 0.85 0.72 800 0.68 0.35

[0128] The absorption performance test comparison data of Example 1 and Comparative Example 1 are shown in Table 5:

[0129] Table 5 Comparison data of absorption performance tests between Example 1 and Comparative Example 1

[0130]

[0131] The experimental results above show that the present invention achieves a comprehensive improvement in sound absorption performance, cost and environmental friendliness by optimizing the ingredient ratio and production process. The sticker of the present invention broadens the sound absorption frequency band to 200-800Hz and increases the average α value by 35%, making it suitable for large-scale promotion in scenarios such as railways and urban elevated roads.

[0132] (2) Durability test was performed on the sticker prepared in Example 1.

[0133] High-pressure water washing: After 100 washes with 10MPa water pressure, there is no surface peeling, and the sound absorption coefficient decreases by ≤5%.

[0134] Outdoor aging: After 5 years of simulated aging (QUV test), the color difference ΔE = 1.3, which meets the requirement of ΔE ≤ 1.5.

[0135] The above experimental results show that the stickers of the present invention have a long service life, are easy to maintain, have low maintenance costs, and have high fidelity and good beautification effect.

[0136] In summary, the sound-absorbing sticker and its manufacturing process for beautifying sound barriers provided by this invention, through the selection of composite sound absorption mechanisms and engineered materials, achieve a wide sound absorption frequency band, thereby improving noise reduction effects. It can also adapt to different sound barrier shapes without modifying the original structure, preserving the original function of the sound barrier to the greatest extent. Furthermore, different patterns and styles can be selected for beautifying the sound barrier, facilitating design that integrates with local characteristics and blends into the surrounding environment. This enhances the function of the original sound barrier while also beautifying it. Moreover, the use of recyclable materials and industrial byproducts reduces material costs, resulting in lower beautification costs and making it suitable for large-scale promotion.

[0137] Specifically, the sound-absorbing layer is made of porous ceramic (sound-absorbing layer) based on industrial waste residue, with fly ash and slag accounting for ≥60%. The sound-absorbing layer substrate is manufactured through a foaming molding process. The gradient pore size broadens the frequency band with a sound absorption coefficient α≥0.6 to 200-800Hz (traditional single-pore size only covers 300-600Hz). The three-layer structure (protective layer, sound-absorbing layer, adhesive layer) further enhances the sound insulation function of the sound barrier. The surface protective layer can withstand 10MPa high-pressure water washing, reducing maintenance costs by 70%. Surface protection is achieved using UV-cured modified polypropylene (PP) film, with an inorganic mineral pigment UV-cured coating (Pantone color card coverage ≥95%), ensuring high color fidelity (ΔE≤1.5 after 5 years of outdoor aging). It is durable, has a significant aesthetic effect, and can be designed with patterns according to actual needs. A matte film covering helps reduce reflection, further enhancing the visual effect. Made with environmentally friendly materials, scraps are crushed and reused as pore-forming agents (≤15%), reducing raw material consumption by 20%. Products that have reached the end of their service life can also be recycled for manufacturing, saving costs and being environmentally friendly. Taking the sound-absorbing layer as an example, waste materials are ground and mixed into new materials as pore-forming agents, reducing fly ash procurement by 23%. The dust collection rate during manufacturing is ≥95%, effectively avoiding secondary pollution. In addition, a water-based acrylic / recycled rubber composite adhesive has been developed as an adhesive layer, using recycled rubber to reduce costs. During installation, simply clean the sound barrier and then stick it on. Using stickers with pre-coated magnetic strips makes the operation more convenient—align → press → complete. A single piece takes 1.2-4 minutes (compared to 5 minutes for a standard solution), making installation convenient and efficient. The peelable design ensures that the adhesive residue rate is ≤5%, leaving almost no residue after removal. Damaged parts can also be replaced individually, and the surface PP film can withstand 10MPa high-pressure water washing, making maintenance convenient and cost-effective. The integrated molding process improves efficiency: the protective layer coating, sound-absorbing layer molding, and adhesive layer pre-coating are completed on a single production line. The electronic-grade R2R (roll to roll) production line is used to achieve a high-speed coating of 5 meters per minute.

[0138] The above descriptions are merely embodiments of the present invention, and common knowledge regarding specific technical solutions or characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A process for preparing sound-absorbing stickers for beautifying sound barriers, characterized in that, Includes the following steps: S1. Preparation of the sound-absorbing layer Weigh out fly ash, slag, foaming agent, and binder in proportion, dry mix them evenly, add water and stir evenly to obtain a uniform slurry; pour the slurry into a mold, foam and solidify to obtain a porous ceramic substrate; after cooling, cut it to standard size and polish the surface; S2. Preparation of the protective layer Modified polypropylene melt is cast into a film through a roll-to-roll production line, and then irradiated under ultraviolet light to form a wear-resistant matte surface, thus obtaining a protective layer. S3, Composite of Absorbent Layer and Protective Layer The composite adhesive is evenly applied to the back of the sound-absorbing layer. The protective layer and the sound-absorbing layer are then bonded together using a hot press roller. After cooling, the layers are rolled up to obtain the sound-absorbing sticker.

2. The manufacturing process of a sound-absorbing sticker for beautifying sound barriers according to claim 1, characterized in that: In S1, the weight ratio of fly ash, slag, foaming agent, binder and water is 40 parts: 20 parts: 5 parts: 10 parts: 25 parts.

3. The manufacturing process of a sound-absorbing sticker for beautifying sound barriers according to claim 1, characterized in that: In S1, the foaming and curing process conditions are foaming and curing at 80℃ and 0.5MPa for 30 minutes.

4. The manufacturing process of a sound-absorbing sticker for beautifying sound barriers according to claim 1, characterized in that: In S2, the raw materials for the modified polypropylene melt include polypropylene, reinforcing materials, and inorganic mineral pigments, and the weight ratio of polypropylene, nano-silica, and inorganic mineral pigments is 100 parts: 3 parts: 2 parts; wherein, the reinforcing materials include any one of nano-silica, micron-sized diatomaceous earth, recycled glass powder, or precipitated silica.

5. The manufacturing process of a sound-absorbing sticker for beautifying sound barriers according to claim 1, characterized in that: In S2, the ultraviolet light intensity is 100 mW / cm². 2 The irradiation time is 10 seconds.

6. The manufacturing process of a sound-absorbing sticker for beautifying sound barriers according to claim 1, characterized in that: In S3, the temperature of the hot press roller composite is 80℃ and the pressure is 0.3MPa.

7. The manufacturing process of a sound-absorbing sticker for beautifying sound barriers according to claim 1, characterized in that: In S3, the composite adhesive consists of recycled rubber powder, aqueous acrylic emulsion, tackifying resin, and deionized water, and the weight ratio of recycled rubber powder, aqueous acrylic emulsion, tackifying resin, and deionized water is 50 parts: 30 parts: 10 parts: 10 parts.

8. A sticker prepared by a sound-absorbing sticker preparation process for beautifying sound barriers according to any one of claims 1 to 7.

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