Novel sound insulation veneer and preparation method thereof

Abstract

The invention relates to the technical field of building materials, in particular to a novel sound insulation veneer and a preparation method thereof. The defects that an existing sound insulation veneer is poor in sound insulation performance and durability are overcome. The novel sound insulation veneer is divided into four layers including a decoration layer, a sound absorption layer, a sound insulation layer and a back plate layer from top to bottom in sequence. The sound-absorbing layer is prepared from the following raw materials: modified castor oil-based polyol, a triethylene diamine catalyst, a silicone oil foam stabilizer, epoxy modified silicon dioxide, epoxidized soybean oil and diphenylmethane diisocyanate; the sound insulation layer is prepared from the following raw materials: gypsum powder, cement, blast furnace slag powder, fly ash, barite powder, fumed silica, a polycarboxylate superplasticizer, citric acid as a retarder, modified glass fibers and a silicone oil emulsion waterproofing agent; finally, the novel sound insulation veneer prepared from the double-modified adhesive is good in sound insulation performance, high in durability and suitable for being applied to residences or office areas for a long time.

Description

Technical Field

[0001] The present invention relates to the technical field of building materials, and particularly to a novel sound-insulating decorative panel and a preparation method thereof. Background Art

[0002] In modern society, noise pollution has become an important factor affecting people's quality of life and work. Long-term exposure to a noisy environment not only interferes with people's normal rest and study, resulting in a decline in sleep quality and difficulty in concentrating, but may also cause damage to hearing and trigger a series of health problems such as tinnitus and hypertension, seriously affecting physical and mental health.

[0003] To reduce noise in buildings, people have taken various measures. Installing double or multi-layer glass windows and using the air layer to block sound transmission can effectively reduce the intrusion of external traffic and other noises into the room; laying sound-absorbing carpets, whose porous structure can absorb some sound energy, reduce sound reflection in the room, and improve the acoustic environment; using sound-insulating decorative panels is also a common method, which can directly block and absorb sound and improve the indoor sound insulation effect.

[0004] Sound-insulating decorative panels are widely used in residential, commercial buildings, industrial factories and other fields. They have many advantages. They can not only effectively sound-insulate and reduce noise, but also have good decorative properties, can beautify the indoor space, and are easy to install, which can improve the construction efficiency.

[0005] Compared with ordinary sound-insulating decorative panels, multi-layer sound-insulating decorative panels have better sound insulation effects and structural stability. Through the combination of multiple different materials, they use the interaction between materials to further enhance the sound insulation performance and perform well in some places with extremely high sound insulation requirements. However, the existing multi-layer sound-insulating decorative panels have disadvantages when applied in general residential and office spaces. On the one hand, the sound insulation performance still needs to be improved and it is difficult to fully meet people's pursuit of a quiet environment, especially the blocking effect on high-frequency noise is not good; on the other hand, the durability is poor, and problems such as deformation and delamination are likely to occur after long-term use, affecting the sound insulation effect and service life, and requiring frequent maintenance or replacement, increasing the use cost and time cost.

[0006] Therefore, how to develop a multi-layer sound-insulating decorative panel with both high sound insulation performance and excellent durability is still an important direction that needs to be continuously explored and broken through in the current industry.

[0007] For this reason, a novel sound-insulating decorative panel and a preparation method thereof are proposed. Summary of the Invention

[0008] The purpose of the present invention is to provide a new type of sound insulation decorative panel and its preparation method. The new type of sound insulation decorative panel of the present invention is divided into four layers, from top to bottom: decorative layer, sound absorption layer, sound insulation layer, backboard layer; the raw materials for preparing the sound absorption layer include: modified castor oil-based polyol, triethylenediamine catalyst, silicone oil foam stabilizer, epoxy modified silica, epoxy soybean oil, diphenylmethane diisocyanate; the raw materials for preparing the sound insulation layer include: gypsum powder, cement, blast furnace slag powder, fly ash, barite powder, fumed nano silica, polycarboxylic acid water reducer, retarder citric acid, modified glass fiber, silicone oil emulsion waterproofing agent; the new type of sound insulation decorative panel finally prepared by double modified adhesive has good sound insulation performance and strong durability, and is suitable for long-term application in residential or office areas.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] On the one hand, the present invention provides a new type of sound insulation decorative panel, which is divided into four layers, namely a decorative layer, a sound absorption layer, a sound insulation layer, and a back plate layer; wherein, by weight,

[0011] The raw materials for preparing the decorative layer include: wood powder, polyvinyl chloride resin, composite lead hot salt stabilizer, stearic acid, KH-550;

[0012] The raw materials for preparing the sound-absorbing layer include: 100 parts of modified castor oil-based polyol, 1 part of triethylene diamine, 2 parts of silicone oil foam stabilizer, 5-9 parts of epoxy-modified silica, 2 parts of epoxy soybean oil, and diphenylmethane diisocyanate;

[0013] The raw materials for preparing the sound insulation layer include: 40-50 parts of gypsum powder, 4-6 parts of cement, 16-20 parts of blast furnace slag powder, 6-10 parts of fly ash, 30-35 parts of barite powder, 5 parts of fumed nano-silica, 1 part of polycarboxylic acid water reducer, 0.5 parts of citric acid retarder, 6-10 parts of modified glass fiber, and 1 part of silicone oil emulsion waterproofing agent;

[0014] The backboard layer is a commercially available 5mm wood multi-layer plywood.

[0015] Preferably, the cement is low-alkalinity sulphoaluminate cement; and the particle size of the blast furnace slag powder is 400 mesh.

[0016] On the other hand, the present invention provides a method for preparing a novel sound insulation decorative panel. The method for preparing the novel sound insulation decorative panel comprises: coating the double modified epoxy adhesive on the surface of the backing layer, and controlling the wet weight coating amount to 120-150g / m 2, place the sound insulation layer on the back panel layer coated with the adhesive, and gently press to fit; then successively fit the sound absorption layer and the decorative layer according to the same coating amount to obtain an assembled panel; perform hot pressing and compounding on the assembled panel at a hot pressing temperature of 50-60°C, a pressure of 0.3-0.5 MPa, and a hot pressing time of 2 h. After trimming the pressed product, cure it for 72 h to obtain a new sound insulation decorative panel.

[0017] Preferably, the preparation method of the double-modified epoxy adhesive is as follows: Add 100 parts of modified epoxy resin to the reaction kettle, stir at 150 rpm, first add the nano-silica dispersion liquid and continue stirring for 20 min, then successively add 3-7 parts of ethylene glycol monobutyl ether, 1-2 parts of KH-560, 0.3-0.7 parts of waterborne polyurethane, 0.2-0.4 parts of dispersant, 0.1-0.2 parts of defoamer, and 0.1-0.2 parts of mildew preventive to the reaction kettle. After adding each component, continue stirring for 10 min to obtain a mixed system. Add 40-50 parts of active amine curing agent to the mixed system and continue stirring for 30 min, then stand still to defoam for 20 min to obtain the double-modified epoxy adhesive.

[0018] Preferably, preheat the waterborne epoxy resin emulsion at a constant temperature of 60°C for 30 min, add poly(tetrahydrofuran) ether glycol after vacuum dehydration at 80°C for 1 h to the waterborne epoxy resin emulsion, and react at a constant temperature of 70°C for 2 h; after the reaction is completed, cool to about 50°C, add fatty alcohol polyoxyethylene ether, and continue stirring for 30 min to obtain modified epoxy resin.

[0019] Preferably, pour the waterborne amine curing agent into a clean reaction container, and slowly drop the triethylenetetramine active diluent within 10 min under stirring; continue stirring for 20 min after dropping; then successively add salicylic acid and alkylphenol polyoxyethylene ether phosphate, and continue stirring for 30 min to obtain the active amine curing agent.

[0020] Preferably, the preparation method of the sound absorption layer is as follows: Add 5-7 parts of epoxy-modified silica to 100 parts of modified castor oil-based polyol, disperse at high speed for 30 min to obtain a dispersed slurry, then add 2-3 parts of deionized water, 0.5-1 part of triethylenediamine catalyst, 0.5-1 part of silicone oil foam stabilizer, and 1-3 parts of epoxy soybean oil to the dispersed slurry. After mixing for 3 min, add 22 parts of diphenylmethane diisocyanate preheated to 25°C, and stir at a speed of 2000 rpm for 15 s to obtain a mixed liquid; inject the mixed liquid into an open mold, complete foaming at a foaming temperature of 25°C, and then cure at room temperature for 16 h to finally obtain the sound absorption layer.

[0021] Preferably, the preparation method of epoxy-modified silica is as follows: Put 3-glycidoxypropyltrimethoxysilane into absolute ethanol and stir for 20 min to obtain a silane ethanol solution. Add the dried nano-silica to the silane ethanol solution, stir and ultrasonically disperse for 30 min. After centrifugation, wash the precipitate by centrifugation for multiple times and then dry to obtain epoxy-modified silica.

[0022] Preferably, the preparation method of modified castor oil-based polyol is as follows: Mix 100 parts of castor oil-based polyol, 30 parts of pentaerythritol, 1 part of p-toluenesulfonic acid, and 10 parts of toluene, and stir at 200 °C for 4 h to obtain a mixed solution. Then add 20 parts of stearic acid, 1 part of p-toluenesulfonic acid, and 10 parts of toluene to the mixed solution; stir at 160 °C for 4 h. After the reaction is completed, cool to room temperature, neutralize, wash with water for multiple times and separate, evaporate and dry to finally obtain modified castor oil-based polyol.

[0023] Preferably, the preparation method of the sound insulation layer is as follows: Add 40 - 50 parts of gypsum powder, 4 - 6 parts of cement, 16 - 20 parts of blast furnace slag powder, 6 - 10 parts of fly ash, 30 - 35 parts of barite powder, and 4 - 8 parts of modified glass fiber to a mixer in sequence, and dry mix for 5 min to obtain a dry mix; Dissolve 1 part of polycarboxylate superplasticizer and 0.5 part of retarder in deionized water to prepare a mixed solution; Then add the fumed nano-silica dispersion liquid and the mixed solution to the dry mix in sequence, and simultaneously add 1 part of silicone emulsion waterproofing agent, and stir for 8 min to prepare a gypsum-based slurry; Inject the gypsum-based slurry into a mold, and after standing, demolding, oxidizing and natural drying, obtain the sound insulation layer.

[0024] Preferably, the preparation method of modified glass fiber is as follows: Immerse chopped glass fiber in an aqueous sodium hydroxide solution, stand and soak at room temperature for 1 h, and intermittently oscillate, and finally wash and dry to obtain pretreated glass fiber; Immerse the pretreated glass fiber in a γ-methacryloxypropyltrimethoxysilane solution, stir and react at room temperature for 2 h, wash and dry the reaction product A for 12 h to obtain silanized modified glass fiber; Immerse the silanized modified glass fiber in an initiator acetone solution, soak in the dark at room temperature for 4 h to obtain a modified glass fiber intermediate; Under nitrogen protection, react the modified glass fiber intermediate, methyl methacrylate monomer, hydroquinone, and toluene at 70 °C with constant temperature stirring for 6 h to obtain reaction product B, subject reaction product B to Soxhlet extraction for 24 h, and then wash and dry to obtain modified glass fiber.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] 1. In the present invention, the modified castor oil-based polyol constructs the basic porous elastic skeleton required for the sound-absorbing layer, while the epoxy-modified silica acts as a structure regulator to optimize the cell structure. For example, it may refine the cell size, increase the tortuosity of the pores, making the sound wave travel a longer path within the pores, increasing the number of reflections and scatterings, and dissipating energy more fully, thereby enhancing the sound absorption coefficient within a wider frequency range and achieving more excellent sound absorption performance. On the one hand, the epoxy-functionalized silica can help optimize the cell structure. On the other hand, the epoxy-modified silica, as a nano-reinforcing filler, is uniformly dispersed in the cell wall skeleton of the polyurethane foam. Through the chemical cross-linking of the epoxy group and the polyol group, the silica particles form a firm interfacial bond with the polyurethane matrix, which can significantly enhance the stiffness and strength of the cell wall skeleton, improve the load-bearing capacity and bending resistance of the sound-absorbing layer, and thus greatly enhance the modulus of rupture.

[0027] 2. In the present invention, during the preparation of the sound-insulating layer, gypsum provides early strength, cement provides medium-term and late strength, and blast furnace slag powder and fly ash contribute to late strength through the pozzolanic reaction, achieving the coordinated development of early, medium-term, and late strength and constructing a matrix with continuously increasing strength. The pozzolanic reaction of blast furnace slag powder and fly ash consumes the by-product calcium hydroxide generated by cement hydration, generates more C-S-H gels, increases the gel phase content, reduces the harmful phase, optimizes the composition of the hydration products, and at the same time can fill the pores between the hydration products of cement and gypsum, refine the pore structure, reduce the porosity, and improve the density of the matrix, thereby enhancing the strength and durability, improving the overall strength and compactness of the matrix, and the overall compactness of the material also enhances the sound insulation performance of the sound-insulating layer.

[0028] 3. In the present invention, adding fumed nano-silica to the sound-insulating layer, on the one hand, the fumed nano-silica participates in the pozzolanic reaction together with blast furnace slag powder and fly ash, more thoroughly consumes calcium hydroxide, generates more C-S-H gels, and more effectively optimizes the composition and microstructure of the hydration products. Secondly, the fumed nano-silica fills the pores at the nano-scale and improves the microstructure, while the active mineral admixtures optimize the hydration reaction at the micron-scale. The two synergistically enhance the matrix performance at different scales, achieve a deeper level of microstructure optimization, and enhance the density of the material, thereby enhancing the sound insulation performance. The fumed nano-silica not only strengthens the interface between the hydration products but also strengthens the interface between the active mineral admixtures and the cement-gypsum matrix, forming a more uniform, continuous, and integral composite matrix, synergistically enhancing the overall mechanical properties and durability of the matrix.

[0029] 4. In the present invention, in the sound insulation layer, modified glass fibers are used. On the one hand, silanization modification introduces silane groups on the surface of the glass fibers, which form covalent bonds with the silanol groups in the gypsum hydration products to form -Si-O-Si- bonds, enhancing the interfacial adhesion between the fibers and the gypsum matrix. Grafting methyl methacrylate introduces organic chain segments, improving the wettability of the fiber surface, enabling the modified glass fibers to form a firm interfacial bond with the gypsum matrix and being more uniformly dispersed in the matrix. The hydrated gypsum matrix itself has relatively high compressive strength, but low tensile strength and flexural strength, belonging to a brittle material and prone to cracking. The modified glass fibers play the role of "reinforcing framework" in the sound insulation layer. When the sound insulation layer is subjected to bending stress, the glass fibers effectively bear the tensile stress by virtue of their high tensile strength, restricting the initiation and propagation of cracks and significantly enhancing the static bending strength of the sound insulation layer. The firm interfacial bond between the glass fibers and the gypsum matrix ensures that the stress can be effectively transferred from the matrix to the fibers, giving full play to the reinforcing effect of the fibers. At the same time, the modified glass fibers enhance the integrity and crack resistance of the sound insulation layer structure, reduce the generation and propagation of microcracks, and reduce the intrusion of water vapor and corrosive media, thereby synergistically improving the aging resistance of the sound insulation layer.

[0030] 5. In the present invention, in the double-modified epoxy adhesive, the flexible modified epoxy resin emulsion and the active amine curing agent act synergistically to construct a high-performance waterborne epoxy adhesive matrix. The flexible chain segments endow the adhesive layer with toughness, and the high-active amine curing agent ensures the curing speed and crosslinking density. The two balance the strength and toughness of the adhesive layer, enabling it to provide high bonding strength and adapt to the deformation of each layer of materials of the decorative panel, thereby synergistically improving the static bending strength and aging resistance of the decorative panel. At the same time, the firm bonding can also reduce the infiltration of water molecules and ensure the overall water resistance of the decorative panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the multi-layer structure of the sound insulation decorative panel of the present invention.

[0032] In the figure: 1. Decorative layer; 2. Sound absorption layer; 3. Sound insulation layer; 4. Back panel layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] Please refer to Figure 1 , the present invention provides a novel sound insulation decorative panel and its preparation method, and the technical solutions are as follows:

[0035] Figure 1 In the present invention, the novel sound-insulating decorative panel prepared is as follows. From top to bottom, it is successively: a decorative layer 1, a sound-absorbing layer 2, a sound-insulating layer 3, and a back panel layer 4;

[0036] The manufacturing process of the novel sound-insulating decorative panel is as follows: First, apply a double-modified epoxy adhesive on the surface of the back panel layer 4, and control the wet coating amount of the adhesive at 120 - 150 grams per square meter. Place the sound-insulating layer 3 on the back panel layer 4 coated with the adhesive and gently press for fitting; then successively assemble the sound-absorbing layer 2 and the decorative layer 1 according to the same coating amount to obtain an assembled multi-layer panel; perform hot pressing and compounding on the assembled multi-layer panel, and finally trim the pressed product with a trimming machine and cure it naturally for 72 hours to obtain the novel sound-insulating decorative panel.

[0037] In the present invention, the sources of the raw materials used are as follows:

[0038] Raw materials for the double-modified epoxy adhesive: waterborne epoxy resin emulsion (Olin, DER-WB3002 WB6001), waterborne amine curing agent (Huntsman EPikure Curing Agent 8535-W-50, USA), dispersant (BYK-190 dispersant), defoaming agent (TEGO Foamex 810), mildew-proof agent (Kathon, CAS No. 26172-55-4).

[0039] Raw materials for the sound-absorbing layer: silicone oil foam stabilizer (Dow Corning DC-193);

[0040] Raw materials for the sound-insulating layer: chopped glass fiber (Shandong Tonghui Glass Fiber Co., Ltd., 6mm), fumed nano-silica (Cabot CAB-O-SIL TS620), polycarboxylate water reducer (Shanghai Hengchuang Chemical Co., Ltd., PC-1022), silicone oil emulsion waterproofing agent (Shandong Huling New Materials Co., Ltd., JC-330), retarder citric acid (CAS No. 77-92-9).

[0041] Example 1

[0042] (I) Preparation of the decorative layer

[0043] First, perform material mixing. According to the formula ratio, add 60 parts of wood powder, 30 parts of polyvinyl chloride resin, 3 parts of composite lead thermal salt stabilizer, 1 part of stearic acid, and 1 part of KH-550 into a high-speed mixer in sequence. Start the high-speed mixer, set the rotation speed to 1000 rpm, and conduct thermal mixing at 130 °C for 10 min to ensure that all components are fully and evenly mixed, and the polyvinyl chloride resin is melted and plasticized to obtain a uniform wood-plastic composite thermal mixing material. Then, immediately add the wood-plastic thermal mixing material into a mold preheated to 170 °C. After closing the mold, apply a pressure of 10 MPa on a hydraulic press for compression molding. The compression molding time is set to 4 min according to the panel thickness. After the compression molding is completed, quickly cool the mold to 45 °C and demold to take out the decorative layer.

[0044] (2) Preparation of the sound-absorbing layer

[0045] 2.1 Preparation of epoxy-modified silica

[0046] Weigh 10 parts of nano-silica powder and dry it at 120 °C for 6 h; put 5 parts of 3-glycidoxypropyltrimethoxysilane into 100 parts of absolute ethanol and stir for 20 min. Slowly and in small batches add the pre-dried 10 parts of nano-silica powder into the round-bottom flask of the silane coupling agent ethanol solution, put in a magnetic stirrer, stir and ultrasonically disperse for 30 min, then transfer the reaction suspension to a centrifuge tube and centrifuge at 4000 rpm for 5 min to leave the precipitate. Add 50 parts of absolute ethanol to the centrifuge tube, stir with a glass rod or ultrasonically disperse, and repeat the centrifugation operation. Repeat the washing with absolute ethanol 3 times until the washing liquid is basically colorless. Then repeat the washing operation with deionized water 3 times and try to pour out the supernatant as much as possible. Dry the washed product at 60 °C for 12 h to obtain epoxy-modified silica.

[0047] 2.2 Preparation of modified castor oil-based polyol

[0048] Add 100 parts of castor oil - based polyol, 30 parts of pentaerythritol, and 1 part of p - toluenesulfonic acid as the transesterification catalyst. Add 10 parts of toluene as the solvent. During the reaction, continuously pass nitrogen for protection. Stir at 200 °C for 4 h to obtain a mixed solution. Then add 20 parts of stearic acid as the hydrophobic modifier and 1 part of p - toluenesulfonic acid as the esterification catalyst to the mixed solution, and add another 10 parts of toluene as the solvent. Similarly, pass nitrogen for protection, heat with an oil bath or heating jacket, with a temperature control accuracy of ±2 °C. Stir at 160 °C for 4 h, and use a condenser with a water separator to recover the generated water. After the reaction, cool to room temperature, neutralize the catalyst with an aqueous solution of sodium carbonate or sodium hydroxide, separate the liquid to remove the aqueous phase, wash with water multiple times until the aqueous phase is neutral, dry overnight with a desiccant such as anhydrous sodium sulfate or anhydrous magnesium sulfate, filter to remove the desiccant, or use a rotary evaporator to vacuum - distill to remove the solvent and residual moisture, and then filter with filter paper or a sintered glass funnel to obtain the modified castor oil - based polyol. The hydroxyl value of the obtained modified castor oil - based polyol is 80 mg KOH / g.

[0049] 2.3 Preparation of the sound - absorbing layer

[0050] First, add 5 parts of epoxy - modified silica powder to 100 parts of the modified castor oil - based polyol, and disperse at high speed for 30 min using a high - speed disperser or ultrasonic disperser to obtain a dispersed slurry. Then add 3 parts of deionized water, 1 part of triethylenediamine catalyst, 1 part of silicone oil foam stabilizer DC193, and 2 parts of epoxidized soybean oil to the dispersed slurry and mix for 3 min to obtain a mixed system. At the same time, preheat 22 parts of diphenylmethane diisocyanate with an NCO content of 31% to 25 °C, quickly add it to the mixed system, and stir with a high - speed stirrer at a speed of 2000 rpm for 15 s. Quickly inject the mixed liquid into an open mold, foam at 25 °C, and cure at room temperature for 16 h to finally obtain the sound - absorbing layer.

[0051] (III) Preparation of the sound - insulation layer

[0052] 3.1 Preparation of the gas - phase method nano - silica dispersion

[0053] Slowly add 5 parts of gas - phase method nano - silica to 30 parts of deionized water, disperse by ultrasonic stirring for 30 min, and let it stand for 24 h after dispersion to obtain the gas - phase method nano - silica dispersion.

[0054] 3.2 Preparation of the modified glass fiber

[0055] Dissolve 1 part of sodium hydroxide solid in 100 parts of deionized water to prepare a sodium hydroxide solution with a mass fraction of 1.0%; mix 200 parts of absolute ethanol and 100 parts of deionized water to obtain a mixed solution, add 2 parts of γ-methacryloxypropyltrimethoxysilane to the mixed solution, and stir for 30 min to prepare a γ-methacryloxypropyltrimethoxysilane solution; dissolve 1 part of benzoyl peroxide in 200 parts of acetone to prepare an initiator acetone solution, and store it in the dark; weigh 100 parts of chopped glass fibers, immerse them in the sodium hydroxide aqueous solution, let them stand at room temperature for 1 h, intermittently oscillate, and finally wash and dry to obtain pretreated glass fibers.

[0056] Immerse the pretreated glass fibers in the γ-methacryloxypropyltrimethoxysilane solution, and stir and react at room temperature for 2 h to obtain reaction product A. Wash reaction product A three times with absolute ethanol to remove the unreacted silane coupling agent, then wash it once with acetone, and then place it in a vacuum drying oven at 80 °C for 12 h to obtain silanized modified glass fibers. Immerse the silanized modified glass fibers in the initiator acetone solution, and soak them in the dark at room temperature for 4 h to allow the initiator to be fully adsorbed to obtain a modified glass fiber intermediate. Under nitrogen protection, add 100 parts of the modified glass fiber intermediate, 20 parts of methyl methacrylate monomer, 0.2 part of hydroquinone, and 200 parts of toluene solvent to a three-necked flask equipped with a stirrer, thermometer, and condenser. Heat to 70 °C and stir and react at a constant temperature for 6 h to carry out free radical graft polymerization to form a polymethyl methacrylate graft layer to obtain reaction product B. After the reaction is completed, extract reaction product B with toluene in a Soxhlet extractor for 24 h to remove the ungrafted homopolymer, and then wash it three times with acetone and absolute ethanol in turn to remove the residual solvent and monomer. Finally, dry it in a vacuum drying oven at 60 °C for 24 h to obtain modified glass fibers.

[0057] 3.3 Preparation of the sound insulation layer

[0058] Add 40 parts of gypsum powder, 4 parts of cement, 16 parts of blast furnace slag powder, 6 parts of fly ash, 30 parts of barite powder, and 6 parts of modified glass fibers to a forced mixer in sequence, and dry mix for 5 min. Then dissolve 1 part of polycarboxylate water reducer and 0.5 part of retarder in deionized water to prepare a mixed solution. Then add the gas-phase nano-silica dispersion liquid and the mixed solution to the dry mix in sequence, stirring while adding, and slowly add a silane-based waterproofing agent or a silicone oil emulsion waterproofing agent at the same time, controlling the total water-cement ratio to be 0.30, and stir for 8 min to prepare a gypsum-based slurry. Pour the gypsum-based slurry into the mold quickly, assist the grouting with a vibrating table, with a vibration frequency of 30 Hz, vibrate for 1 - 2 min to exhaust air bubbles and improve the density. After grouting, let it stand for 30 min. After initial setting and demolding, place the gypsum sound insulation layer in a constant temperature curing room at 50 °C for wet curing for 72 h, and after completion, dry it naturally for 7 days under ventilation conditions to obtain the sound insulation layer.

[0059] (IV) Preparation of the double-modified epoxy adhesive

[0060] The waterborne epoxy resin emulsion was preheated at a constant temperature of 60 °C for 30 min. Poly(tetrahydrofuran) ether diol was vacuum dehydrated at 80 °C for 1 h and then added to the waterborne epoxy resin emulsion, and the reaction was carried out at a constant temperature of 70 °C for 2 h. After the reaction, it was cooled to about 50 °C, and emulsifier fatty alcohol polyoxyethylene ether was added, and stirring was continued for 30 min to obtain the modified epoxy resin.

[0061] The waterborne amine curing agent was poured into a clean reaction vessel, and triethylenetetramine active diluent was slowly added dropwise within 10 min under stirring. After the addition was completed, stirring was continued for 20 min. Then, 1 part of salicylic acid and 1 part of dispersant alkylphenol polyoxyethylene ether phosphate were added in sequence, and stirring was continued for 30 min to obtain the active amine curing agent.

[0062] 100 parts of the modified epoxy resin were added to the reaction kettle and stirred at 150 rpm. 3 parts of nano-silica was dispersed in 20 parts of deionized water under ultrasonic stirring to prepare a nano-silica dispersion liquid, and the nano-silica dispersion liquid was added to the modified epoxy resin and stirring was continued for 20 min. Then, 3 parts of active diluent ethylene glycol monobutyl ether, 1 part of KH-560, 0.3 part of waterborne polyurethane thickener, 0.2 part of wetting dispersant, 0.1 part of defoamer and 0.1 part of mildew preventive were added to the reaction kettle in sequence, and stirring was continued for 10 min after each addition of a component to obtain a mixed system. 40 parts of the active amine curing agent was added to the mixed system and stirring was continued for 30 min, and then it was left standing to defoam for 20 min to obtain the double-modified epoxy adhesive.

[0063] (V) Preparation of the novel sound insulation decorative panel

[0064] The back panel layer used a commercially available 5 mm wood multi-ply board. The double-modified epoxy adhesive was coated on the surface of the back panel layer, and the wet coating amount of the adhesive was controlled at 150 g / m 2 , and the sound insulation layer was placed on the back panel layer coated with the adhesive and gently pressed for fitting; then, the sound absorption layer and the decorative layer were assembled in sequence according to the same coating amount to obtain an assembled multi-layer panel; the assembled panel was hot-pressed and laminated, the hot-pressing temperature was 50 °C, the hot-pressing pressure was 0.5 MPa, and the hot-pressing time was 2 h. The pressed product was trimmed with a trimming machine and naturally cured in a ventilated and cool place for 72 h to obtain the novel sound insulation decorative panel.

[0065] The difference between Example 2 and Example 1 was that the component dosages used in the preparation of the sound absorption layer and the sound insulation layer were different:

[0066] The raw materials for preparing the sound absorption layer included: 100 parts of modified castor oil-based polyol, 1 part of triethylenediamine catalyst, 2 parts of silicone oil foam stabilizer, and 7 parts of epoxy-modified silica;

[0067] The raw materials for preparing the sound insulation layer include: 45 parts of gypsum powder, 5 parts of cement, 18 parts of blast furnace slag powder, 8 parts of fly ash, 33 parts of barite powder, 2 parts of fumed nano-silica, 1.0 part of polycarboxylate water reducer, 0.3 part of retarder citric acid, 8 parts of modified glass fiber, and 1 part of silane waterproofing agent. The remaining parameters and conditions are the same.

[0068] The difference between Example 3 and Example 1 is that the amounts of components used in preparing the sound absorption layer and the sound insulation layer are different:

[0069] The raw materials for preparing the sound absorption layer include: 100 parts of modified castor oil-based polyol, 1 part of triethylenediamine catalyst, 2 parts of silicone oil foam stabilizer, and 9 parts of epoxy-modified silica;

[0070] The raw materials for preparing the sound insulation layer include: 50 parts of gypsum powder, 6 parts of cement, 20 parts of blast furnace slag powder, 10 parts of fly ash, 35 parts of barite powder, 5 parts of fumed nano-silica, 1.0 part of polycarboxylate water reducer, 0.1 part of retarder citric acid, 10 parts of modified glass fiber, and 1 part of silicone oil emulsion waterproofing agent. The remaining parameters and conditions are the same.

[0071] The difference between Example 4 and Example 1 is that the amounts of components used in preparing the sound absorption layer and the sound insulation layer are different:

[0072] The raw materials for preparing the sound absorption layer include: 100 parts of modified castor oil-based polyol, 1 part of triethylenediamine catalyst, 2 parts of silicone oil foam stabilizer, and 7 parts of epoxy-modified silica;

[0073] The raw materials for preparing the sound insulation layer include: 50 parts of gypsum powder, 6 parts of cement, 20 parts of blast furnace slag powder, 10 parts of fly ash, 35 parts of barite powder, 5 parts of fumed nano-silica, 1.0 part of polycarboxylate water reducer, 0.1 part of retarder citric acid, 10 parts of modified glass fiber, and 1 part of silicone oil emulsion waterproofing agent. The remaining parameters and conditions are the same.

[0074] The difference between Example 5 and Example 1 is that the amounts of components used in preparing the sound absorption layer and the sound insulation layer are different:

[0075] The raw materials for preparing the sound absorption layer include: 100 parts of modified castor oil-based polyol, 1 part of triethylenediamine catalyst, 2 parts of silicone oil foam stabilizer, and 9 parts of epoxy-modified silica;

[0076] The raw materials for preparing the sound insulation layer include: 45 parts of gypsum powder, 5 parts of cement, 18 parts of blast furnace slag powder, 8 parts of fly ash, 33 parts of barite powder, 2 parts of fumed nano-silica, 1.0 part of polycarboxylate water reducer, 0.3 part of retarder citric acid, 8 parts of modified glass fiber, and 1 part of silane waterproofing agent. The remaining parameters and conditions are the same.

[0077] The difference between Comparative Example 1 and Example 1 is that in the preparation raw materials of the sound-absorbing layer, the castor oil-based polyol is not modified, and the remaining parameters and conditions are the same.

[0078] The difference between Comparative Example 2 and Example 1 is that in the preparation raw materials of the sound-absorbing layer, the silica used is not epoxy-modified, and the remaining parameters and conditions are the same.

[0079] The difference between Comparative Example 3 and Example 1 is that in the preparation process of the sound-absorbing layer, the foaming temperature is 70 °C, and the remaining parameters and conditions are the same.

[0080] The difference between Comparative Example 4 and Example 1 is that in the preparation process of the sound-absorbing layer, the curing time is 8 h, and the remaining parameters and conditions are the same.

[0081] The difference between Comparative Example 5 and Example 1 is that in the preparation process of the sound-insulating layer, blast furnace slag powder is not added, and the remaining parameters and conditions are the same.

[0082] The difference between Comparative Example 6 and Example 1 is that in the preparation process of the sound-insulating layer, fly ash is not added, and the remaining parameters and conditions are the same.

[0083] The difference between Comparative Example 7 and Example 1 is that in the preparation process of the sound-insulating layer, Portland cement is used, and the remaining parameters and conditions are the same.

[0084] The difference between Comparative Example 8 and Example 1 is that in the preparation process of the sound-insulating layer, the particle size of the blast furnace slag powder is 200 mesh, and the remaining parameters and conditions are the same.

[0085] The difference between Comparative Example 9 and Example 1 is that in the preparation process of the sound-insulating layer, modified glass fiber is not added, and the remaining parameters and conditions are the same.

[0086] The difference between Comparative Example 10 and Example 1 is that in the preparation process of the sound-insulating layer, unmodified chopped glass fiber is used to replace the modified glass fiber, and the remaining parameters and conditions are the same.

[0087] The difference between Comparative Example 11 and Example 1 is that in the preparation process of the sound-insulating layer, modified glass fiber intermediate is used to replace the modified glass fiber, and the remaining parameters and conditions are the same.

[0088] The difference between Comparative Example 12 and Example 1 is that in the preparation process of the sound-insulating layer, fumed nano-silica is not added.

[0089] Test Example 1

[0090] Test object: The newly prepared sound-insulating decorative panels finally prepared in Examples 1-5 and Comparative Examples 1-11 are used for testing.

[0091] Test methods: (1) The test of sound insulation quantity (frequency range: 2000 - 5000 Hz) and sound absorption coefficient (1600 - 2000 Hz) refers to "GB / T 19889.3 - 2005 Acoustics - Measurement of sound insulation in buildings and of building elements - Part 3: Laboratory measurement of airborne sound insulation of building elements";

[0092] (2) The tests of static bending strength and water absorption expansion degree refer to "GB / T 17657 - 2022 Test methods for physical and chemical properties of wood - based panels and wood - based panels with surface decoration";

[0093] (3) The test method for aging resistance is: ((Static bending strength before aging - Static bending strength after aging) / Static bending strength before aging) * 100%, and the smaller the result, the stronger the aging resistance.

[0094] The final test results are shown in Table 1.

[0095] Table 1 Test results of sound insulation quantity and sound absorption coefficient for Examples 1 - 5 and Comparative Examples 1 - 12

[0096]

[0097] In Comparative Example 1, unmodified castor oil - based polyol was used, which reduced the cross - linked hydroxyl groups, decreased the cross - linking density of the polyurethane sound - absorbing layer, made the three - dimensional network structure sparser, and weakened the intermolecular force. Microscopically, the cell wall became thinner, the size increased, the porosity rose, and the structure became loose. This led to a decrease in the dissipation efficiency of sound wave energy, a decline in sound insulation quantity, a weakening of the ability to resist external forces, and a reduction in static bending strength. Although the high - frequency sound absorption performance may be improved, the overall sound absorption coefficient changes little. The increase in porosity causes an increase in water absorption expansion degree and a deterioration in aging resistance.

[0098] In Comparative Example 2, the un - epoxy - modified silica had few surface active groups and could not form strong covalent bonds with the polyurethane matrix. The interfacial bonding force mainly relied on physical interactions, and the bonding strength weakened. Microscopically, the dispersibility became worse, it was easy to agglomerate, there were micro - cracks and voids at the interface, and the stress transfer efficiency decreased, resulting in a weakened strengthening effect. Macroscopically, the static bending strength decreased, the sound insulation quantity and sound absorption coefficient decreased slightly, the ability to resist water molecule penetration declined, the water absorption expansion degree increased slightly, and the aging resistance deteriorated.

[0099] In Comparative Example 3, the foaming temperature of the sound-absorbing layer was increased to 70 °C to accelerate foaming and curing. The diffusion and mixing time of each component was shortened, making it difficult to control the nucleation and growth of bubbles. The effect of the foam stabilizer was insufficient, and the foam was prone to collapse and the cell structure was uneven. Microscopically, the cell size distribution was uneven, some cells collapsed, or the closed-cell rate increased, and the open-cell interconnected structure decreased, which was not conducive to sound wave dissipation. The sound insulation amount and sound absorption coefficient decreased significantly, while other properties were less affected. At the same time, it can be seen from Comparative Example 4 that the curing time of the sound-absorbing layer was shortened to 8 hours, the cross-linking reaction was insufficient, the polyurethane network was not fully established, there were unreacted groups, the molecular chain movement was restricted, and there were many defects in the network structure. Microscopically, the network structure was incomplete, the cross-linking density was insufficient, there were micropores and defects, which affected the mechanical and acoustic properties. Macroscopically, the static bending strength decreased, the sound insulation amount and sound absorption coefficient decreased slightly, the ability to resist water molecules decreased, the water absorption expansion degree increased, and the aging resistance decreased.

[0100] In Comparative Example 5, blast furnace slag powder was not added to the sound insulation layer, lacking the pozzolanic effect, and unable to generate additional calcium silicate hydrate gel. The gel phase of the cement stone decreased, and the unhydrated particles and pores increased. Microscopically, the structure of the cement stone was loose, the porosity increased, and the density decreased, weakening the attenuation of sound wave energy and reducing the sound insulation amount. The decrease in C-S-H gel reduced the strength, and the static bending strength decreased significantly. The loose structure led to an increase in the water absorption expansion degree and a decrease in the aging resistance. Considering Comparative Example 6, when fly ash was not added to the sound insulation layer, the degree of lack of the pozzolanic effect was relatively light because there was still slag powder providing activity. Microscopically, the density of the cement stone decreased slightly and the porosity increased slightly, and the overall structure change was smaller than that in Comparative Example 5. Macroscopically, the sound insulation amount and static bending strength decreased slightly, and other properties were also slightly affected, indicating that fly ash played an auxiliary optimization role. Similarly, it can be seen from Comparative Example 7 that when ordinary Portland cement was used to replace low-alkali sulphoaluminate cement in the sound insulation layer, the hydration products changed. Microscopically, the crystal morphology, packing mode, and pore structure might change, and the decrease in density was limited. The performance was basically less affected.

[0101] It can be seen from Comparative Example 8 that the particle size of the blast furnace slag powder increased to 200 mesh, the specific surface area decreased, the pozzolanic reaction activity was inhibited, the degree of hydration reaction with cement decreased, and the pozzolanic effect weakened. Microscopically, the number of unreacted slag powder particles increased, the C-S-H gel decreased, the density of the cement stone decreased, the porosity increased, and the pore size distribution became wider. Macroscopically, the sound insulation amount and static bending strength decreased, the ability to resist water molecule penetration decreased, the water absorption expansion degree increased, and the aging resistance became worse.

[0102] In Comparative Example 9, modified glass fiber was not added to the sound insulation layer, and the cement-based material lacked fiber reinforcement, resulting in a decrease in tensile strength and fracture toughness and a weakening of the ability to resist external forces. Microscopically, there was a lack of fiber bridging, cracks were prone to initiate and expand, microcracks increased, and the structural integrity decreased. Macroscopically, the static bending strength decreased, the aging resistance decreased, the water absorption increased, the water absorption expansion degree increased, and the sound insulation amount and sound absorption coefficient were less affected.

[0103] In Comparative Example 10, the sound insulation layer uses unmodified chopped glass fibers to replace the modified glass fibers. The fiber surface is not effectively modified, and the interfacial bonding relies on physical action, resulting in weakened bonding strength and reduced stress transfer efficiency. Microscopically, there are pores and microcracks at the interface, and the interfacial transition zone is loose, making it difficult to exert the fiber reinforcement effect. Macroscopically, the static bending strength is lower than that of Example 1 but higher than that of Comparative Example 9. The water absorption expansion degree and aging resistance performance are lower than those of Example 1 but better than those of Comparative Example 9. The sound insulation amount and sound absorption coefficient are similar to those of Example 1.

[0104] In Comparative Example 11, the sound insulation layer uses modified glass fiber intermediates to replace the finally modified glass fibers. The intermediates are only modified with silane coupling agents and not subjected to methyl methacrylate graft copolymerization, resulting in a low degree of modification. Microscopically, the interfacial bonding strength is lower than that of Example 1 and slightly better than that of Comparative Example 10, and the fiber reinforcement and durability improvement effects are between the two. Macroscopically, the static bending strength, water absorption expansion degree, and aging resistance performance are between Example 1 and Comparative Example 10, and the sound insulation amount and sound absorption coefficient are basically the same as those of Example 1, indicating that the methyl methacrylate graft copolymerization modification is very important.

[0105] In Comparative Example 12, no fumed nano-silica is added during the preparation of the sound insulation layer, resulting in the lack of nano-scale active fillers inside the gypsum-based slurry. The calcium hydroxide in the cement hydration products lacks an efficient secondary pozzolanic reaction, reducing the amount of C-S-H gel formed, and the microstructure of the sound insulation layer matrix material becomes loose. At the same time, the lack of nano-silica also causes the disappearance of the nano-pore filling effect inside the slurry, an increase in porosity, a deterioration in pore size distribution, a decrease in material density, and an increase in microstructural defects. The above microstructural deterioration will lead to a deterioration in both the acoustic and mechanical properties of the sound insulation layer.

[0106] The difference between Example 6 and Example 4 is that the dosages of each component are different when preparing the double-modified epoxy adhesive: 5 parts of the active diluent ethylene glycol monobutyl ether, 1.5 parts of KH-560, 0.5 part of the waterborne polyurethane thickener, 0.3 part of the wetting and dispersing agent, 0.15 part of the defoaming agent, 0.15 part of the mildew preventive, and 45 parts of the active amine curing agent.

[0107] The difference between Example 7 and Example 4 is that the dosages of each component are different when preparing the double-modified epoxy adhesive: 7 parts of the active diluent ethylene glycol monobutyl ether, 2 parts of KH-560, 0.7 part of the waterborne polyurethane thickener, 0.4 part of the wetting and dispersing agent, 0.2 part of the defoaming agent, 0.2 part of the mildew preventive, and 50 parts of the active amine curing agent.

[0108] The difference between Examples 8 - 12 and Example 6 is that the coating amount of the final adhesive and the parameters during the pressing of the decorative panel are different, as specifically shown in Table 2.

[0109] Table 2 Parameter Table of Example 6, Examples 8 - 12

[0110]

[0111] The difference between Comparative Example 13 and Example 6 is that during the preparation of the double-modified epoxy adhesive, the waterborne epoxy resin emulsion is not modified, and the remaining parameters and conditions are the same.

[0112] The difference between Comparative Example 14 and Example 6 is that during the preparation of the double-modified epoxy adhesive, the waterborne amine curing agent is not modified, and the remaining parameters and conditions are the same.

[0113] The difference between Comparative Example 15 and Example 6 is that during the preparation of the double-modified epoxy adhesive, after mixing the nano-silica dispersion, the active diluent ethylene glycol monobutyl ether, KH-560, the waterborne polyurethane thickener, the wetting and dispersing agent, the defoaming agent, and the mildew-proof agent together, they are added to the reaction kettle containing the modified epoxy resin, and the remaining parameters and conditions are the same.

[0114] The difference between Comparative Example 16 and Example 6 is that during the preparation of the double-modified epoxy adhesive, after adding the nano-silica dispersion first, the silane coupling agent KH-560, the active diluent ethylene glycol monobutyl ether, the waterborne polyurethane thickener, the wetting and dispersing agent, the defoaming agent, and the mildew-proof agent are added in sequence, and the remaining parameters and conditions are the same.

[0115] The difference between Comparative Example 17 and Example 6 is that during the preparation of the double-modified epoxy adhesive, after adding the nano-silica dispersion first, the active diluent ethylene glycol monobutyl ether, the waterborne polyurethane thickener, the wetting and dispersing agent, the silane coupling agent KH-560, the defoaming agent, and the mildew-proof agent are added in sequence, and the remaining parameters and conditions are the same.

[0116] The difference between Comparative Example 18 and Example 6 is that the hot pressing temperature is 100 °C, and the remaining parameters and conditions are the same.

[0117] Test Example 2

[0118] Test object: The decorative panels finally prepared in Examples 6-12 and Comparative Examples 13-18 were tested.

[0119] The test method is the same as that in Test Example 1, and the final test results are shown in Table 3.

[0120] Table 3 Test Results of Example 4, Examples 6-12 and Comparative Examples 13-18

[0121]

[0122] In Comparative Example 13, the modification of the waterborne epoxy resin emulsion with polytetrahydrofuran ether diol was cancelled. The flexible polyether chain segment was missing in the epoxy resin molecular chain, and the long-chain flexible ether bonds were reduced. This changed the microstructure of the double-modified epoxy adhesive after curing. The molecular chain movement was restricted, the crosslinked network became more rigid and brittle, the flexibility of the molecular chain and the energy dissipation pathway were reduced, resulting in a decrease in the sound insulation and sound absorption coefficient of the decorative panel. At the same time, the stress in the rigid structure was prone to concentration, the ability to resist bending deformation decreased, and the modulus of rupture decreased; the free volume inside the material increased, more hydrophilic hydroxyl groups were exposed, the water absorption swelling degree increased, and the aging resistance became worse.

[0123] In Comparative Example 14, the waterborne amine curing agent was not modified with triethylenetetramine. The molecular structure lacked a flexible amine-based long chain, which affected the curing reaction with the epoxy resin and the construction of the crosslinked network. The unmodified curing agent had fewer crosslinking reaction sites, the crosslinked network was sparse and incomplete, the crosslinking density decreased, and the microstructure of the adhesive layer was loose. This weakened the intermolecular force, resulting in a decrease in the modulus of rupture and sound insulation of the decorative panel; there were many defects in the crosslinked network, the sound wave energy dissipation efficiency was low, the sound insulation decreased further, and the resistance to erosion was weak, and the water absorption swelling degree and aging resistance became worse.

[0124] In Comparative Example 15, the sequential addition process was disrupted, and the nano-silica dispersion liquid and others were mixed and added at one time, destroying the construction of the progressive strengthening microenvironment. It was difficult for nano-silica to disperse in the high-viscosity matrix and was prone to agglomeration, losing its nano advantages. Microscopically, the agglomerates made the structural uniformity worse, stress concentration occurred, hindering the diffusion and bonding of the silane coupling agent, reducing the interfacial bonding strength and the stress transfer efficiency. The nano-silica agglomerates not only hindered the bonding of the silane coupling agent but also hindered the effective propagation and energy dissipation of sound waves inside the material. Macroscopically, the mechanical properties of the double-modified epoxy adhesive decreased, and the modulus of rupture, sound insulation, and sound absorption coefficient of the decorative panel decreased, the water absorption increased, and the aging resistance became worse.

[0125] In Comparative Example 16, the addition sequence of the silane coupling agent was adjusted. Although the preliminary dispersion of nano-silica was ensured, the microscopic environment of the interfacial modification was changed. When the reactive diluent was added first, it might competitively adsorb on the surface of nano-silica, hindering the contact and bonding between the silane coupling agent and the surface hydroxyl groups, and reducing the interfacial modification efficiency. Microscopically, the degree of interfacial chemical bonding decreased, the bonding strength and compactness were affected, and the stress transfer efficiency decreased. Macroscopically, the interfacial and mechanical properties of the double-modified epoxy adhesive decreased slightly, the static bending strength and sound insulation of the decorative panel decreased slightly, and the sound absorption coefficient and durability changed insignificantly. Combining with the sequence in Comparative Example 17, the addition of the silane coupling agent was further delayed, deteriorating the microscopic environment of the interfacial modification. The aqueous polyurethane thickener increased the viscosity of the system, forming a polymer entanglement network, and the wetting and dispersing agent formed an adsorption layer, hindering the diffusion of the silane coupling agent, reducing the reaction sites, and greatly weakening the interfacial modification efficiency. Microscopically, the degree of interfacial chemical bonding, bonding strength and compactness decreased, the defects increased, and the stress transfer efficiency decreased. Macroscopically, the performance of the double-modified epoxy adhesive deteriorated, but the nano-silica still had a certain degree of dispersion, and the degree of performance decline slowed down. The static bending strength and sound insulation of the decorative panel decreased slightly, and the sound absorption coefficient and durability were basically not affected.

[0126] In Comparative Example 18, the hot pressing temperature was increased to 100 °C. The high temperature accelerated the curing reaction of the double-modified epoxy adhesive, and it was difficult for the heat to dissipate. Thermal stress concentration was formed inside the decorative panel, weakening the intermolecular force and even breaking the bonds. Defects such as microcracks and voids appeared in the adhesive layer, reducing the compactness and strength. At the same time, the high temperature accelerated the thermal decomposition of the polyurethane foam in the sound absorption layer, destroying the cell structure, and there was also a risk of thermal degradation of the wood powder and polyvinyl chloride resin in the decorative layer. Macroscopically, the static bending strength, sound insulation and sound absorption coefficient of the decorative panel decreased, the water absorption expansion and aging resistance were affected, and the comprehensive performance decreased.

[0127] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made in these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A new type of sound insulation decorative panel, characterized by: The novel sound insulation decorative panel is divided into four layers, namely, a decorative layer, a sound absorption layer, a sound insulation layer, and a back plate layer; wherein, by weight, The raw materials for preparing the decorative layer include: wood powder, polyvinyl chloride resin, composite lead hot salt stabilizer, stearic acid, and KH-550; The raw materials for preparing the sound-absorbing layer include: 100 parts of modified castor oil-based polyol, 1 part of triethylene diamine, 2 parts of silicone oil foam stabilizer, 5-9 parts of epoxy-modified silica, 2 parts of epoxy soybean oil, and diphenylmethane diisocyanate; The raw materials for preparing the sound insulation layer include: 40-50 parts of gypsum powder, 4-6 parts of cement, 16-20 parts of blast furnace slag powder, 6-10 parts of fly ash, 30-35 parts of barite powder, 5 parts of fumed nano-silica, 1 part of polycarboxylic acid water reducer, 0.5 parts of citric acid retarder, 6-10 parts of modified glass fiber, and 1 part of silicone oil emulsion waterproofing agent; The backboard layer is a commercially available 5mm wooden multi-layer plywood.

2. A novel sound insulation decorative panel according to claim 1, characterized in that: The cement is low-alkalinity sulphoaluminate cement; the particle size of the blast furnace slag powder is 400 meshes.

3. A method for preparing the novel sound insulation decorative panel according to any one of claims 1 to 2, characterized in that: The preparation method of the novel sound insulation decorative panel is as follows: the double modified epoxy adhesive is coated on the surface of the backing layer, and the wet weight coating amount is controlled at 120-150g / m 2 , placing the sound insulation layer on the backboard layer coated with adhesive, and lightly pressing and laminating; then laminating the sound absorption layer and the decorative layer in sequence according to the same coating amount to obtain an assembled panel; hot pressing and laminating the assembled panel, the hot pressing temperature is 50-60°C, the pressure is 0.3-0.5MPa, and the hot pressing time is 2h. After the pressed product is trimmed and cured for 72h, the new sound insulation decorative panel is obtained.

4. The method for preparing the novel sound insulation decorative panel according to claim 3 is characterized in that: The preparation method of the double-modified epoxy adhesive is as follows: 100 parts of modified epoxy resin are added into a reaction kettle, and the mixture is stirred at 150 rpm, and a nano-silicon dioxide dispersion is first added and the mixture is stirred for 20 minutes, and then 3-7 parts of ethylene glycol butyl ether, 1-2 parts of KH-560, 0.3-0.7 parts of waterborne polyurethane, 0.2-0.4 parts of dispersant, 0.1-0.2 parts of defoamer and 0.1-0.2 parts of mildewproofing agent are sequentially added into the reaction kettle, and the mixture is stirred for 10 minutes after each component is added to obtain a mixed system, and 40-50 parts of an active amine curing agent are added into the mixed system and the mixture is stirred for 30 minutes, and then the mixture is allowed to stand for defoaming for 20 minutes to obtain the double-modified epoxy adhesive.

5. The method for preparing the novel sound insulation decorative panel according to claim 4 is characterized in that: The aqueous epoxy resin emulsion is preheated at a constant temperature of 60° C. for 30 minutes, polytetrahydrofuran ether diol is vacuum dehydrated at 80° C. for 1 hour, and then added to the aqueous epoxy resin emulsion, and the reaction is carried out at a constant temperature of 70° C. for 2 hours; after the reaction is completed, the mixture is cooled to about 50° C., and fatty alcohol polyoxyethylene ether is added, and the mixture is stirred for 30 minutes to obtain the modified epoxy resin; Pour the water-based amine curing agent into a clean reaction container, and slowly add triethylenetetramine active diluent within 10 minutes under stirring; continue stirring for 20 minutes after the addition is completed; then add salicylic acid and alkylphenol polyoxyethylene ether phosphate in sequence, and continue stirring for 30 minutes to obtain the active amine curing agent.

6. The method for preparing the novel sound insulation decorative panel according to claim 3 is characterized in that: The preparation method of the sound-absorbing layer is as follows: 5-7 parts of epoxy-modified silica are added to 100 parts of modified castor oil-based polyol, and the mixture is dispersed at high speed for 30 minutes to obtain a dispersed slurry; then 2-3 parts of deionized water, 0.5-1 parts of triethylenediamine catalyst, 0.5-1 parts of silicone oil foam stabilizer, and 1-3 parts of epoxy soybean oil are added to the dispersed slurry, and the mixture is mixed for 3 minutes, and then 22 parts of diphenylmethane diisocyanate preheated to 25° C. are added, and the mixture is stirred at a speed of 2000 rpm for 15 seconds to obtain a mixed solution; the mixed solution is injected into an open mold, and after foaming is completed at a foaming temperature of 25° C., the mixed solution is aged at room temperature for 16 hours to finally obtain the sound-absorbing layer.

7. The method for preparing the novel sound insulation decorative panel according to claim 6 is characterized in that: The preparation method of the epoxy-modified silica is as follows: 3-glycidoxypropyltrimethoxysilane is placed in anhydrous ethanol, stirred for 20 minutes to obtain a silane ethanol solution, the dried nano-silica is added to the silane ethanol solution, stirred and ultrasonically dispersed for 30 minutes, centrifuged, washed the precipitate several times, centrifuged it, and then dried to obtain the epoxy-modified silica; The preparation method of the modified castor oil-based polyol is as follows: 100 parts of castor oil-based polyol, 30 parts of pentaerythritol, 1 part of p-toluenesulfonic acid and 10 parts of toluene are mixed, and the mixture is stirred at a temperature of 200° C. for 4 hours to obtain a mixed solution, and then 20 parts of stearic acid, 1 part of p-toluenesulfonic acid and 10 parts of the toluene are added to the mixed solution; the mixture is stirred at a temperature of 160° C. for 4 hours, and after the reaction is completed, the mixture is cooled to room temperature, neutralized, washed with water for multiple times and separated, evaporated and dried to finally obtain the modified castor oil-based polyol.

8. The method for preparing the novel sound insulation decorative panel according to claim 3 is characterized in that: The preparation method of the sound insulation layer is as follows: 40-50 parts of gypsum powder, 4-6 parts of cement, 16-20 parts of blast furnace slag powder, 6-10 parts of fly ash, 30-35 parts of barite powder and 4-8 parts of modified glass fiber are added to a mixer in sequence, and dry mixed for 5 minutes to obtain a dry mixed material; Dissolve 1 part of polycarboxylate water reducer and 0.5 parts of retarder in deionized water to prepare a mixed solution; then add the fumed nano-silica dispersion and the mixed solution to the dry mix in sequence, and add 1 part of silicone oil emulsion waterproofing agent at the same time, and stir for 8 minutes to prepare a gypsum-based slurry; inject the gypsum-based slurry into a mold, let it stand, oxidize after demoulding and naturally dry to obtain the sound insulation layer.

9. The method for preparing the novel sound insulation decorative panel according to claim 8, characterized in that: The modified glass fiber preparation method comprises the following steps: immersing short glass fibers in a sodium hydroxide aqueous solution, standing and immersing for 1 hour at room temperature, intermittently shaking, and finally washing and drying to obtain pretreated glass fibers; immersing the pretreated glass fibers in a γ-methacryloxypropyltrimethoxysilane solution, stirring and reacting for 2 hours at room temperature, washing and drying a reaction product A for 12 hours to obtain a silanized modified glass fiber; immersing the silanized modified glass fiber in an initiator acetone solution, soaking in the dark for 4 hours at room temperature to obtain a modified glass fiber intermediate; under nitrogen protection, stirring and reacting the modified glass fiber intermediate, methyl methacrylate monomer, hydroquinone and toluene at 70° C. for 6 hours to obtain a reaction product B, extracting the reaction product B with Soxhlet for 24 hours, and then washing and drying to obtain the modified glass fiber.

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