Noise reduction and heat preservation composition, noise reduction and heat preservation layer and application thereof

Abstract

The invention relates to the technical field of heat preservation and noise reduction, in particular to a noise reduction and heat preservation composition, a noise reduction and heat preservation layer and application thereof. The composition comprises a gas barrier layer material and a foaming material layer material, the material of the foaming material layer is selected from a super-hydrophobic melamine porous material; the super-hydrophobic melamine porous material contains a hydrophobic group, and the hydrophobic group comprises carbonyl. The noise-reducing and heat-preserving layer can preserve heat and absorb sound waves to reduce noise, in addition, the noise-reducing and heat-preserving layer further has excellent hydrophobic performance, the obvious moisture absorption phenomenon cannot occur along with the increase of the service time, and the noise-reducing and heat-preserving durability is good.

Description

Technical Field

[0001] This invention relates to the field of thermal insulation and noise reduction technology, specifically to a noise reduction and thermal insulation composition and a noise reduction and thermal insulation layer, and their applications. Background Technology

[0002] Pipeline transportation of high and low temperature media is an essential process in petrochemical production. Appropriate and effective insulation measures for these pipelines can reduce heat loss during transportation and eliminate the risk of rupture and leakage caused by excessive temperature differences between the inside and outside of the pipeline. Pipeline insulation with rock wool as the core insulation and a metal outer shell as a protective cover remains the mainstream product on the market. However, the limited insulation effect and susceptibility to moisture absorption of rock wool have become increasingly apparent during use, necessitating the development of new insulation materials. Furthermore, noise pollution is often present during pipeline transportation, threatening the health of on-site operators.

[0003] Porous melamine resin foam is considered a competitor to rock wool due to its high porosity, excellent temperature resistance, and self-extinguishing properties. Furthermore, its absorption performance for high-frequency sound waves is significantly superior to common porous materials, making it an excellent sound-absorbing material. However, the application of melamine resin foam in pipeline noise reduction and insulation urgently requires addressing its poor hydrophobicity and insignificant heat convection suppression effects. Summary of the Invention

[0004] The purpose of this invention is to overcome the problems of poor hydrophobicity and insignificant heat convection suppression effect of existing melamine resin-based pipe insulation materials, and to provide a noise-reducing insulation composition, a noise-reducing insulation layer, and its application. Compared with commonly used rock wool, the noise-reducing insulation layer can absorb sound waves to reduce noise while providing insulation. In addition, it has excellent hydrophobic properties and does not exhibit significant moisture absorption over time, resulting in good noise reduction and insulation durability.

[0005] To achieve the above objectives, a first aspect of the present invention provides a noise reduction and heat preservation composition, the composition comprising a gas barrier layer material and a foaming material layer material;

[0006] The foaming material layer is selected from superhydrophobic melamine porous materials; the superhydrophobic melamine porous materials contain hydrophobic groups, including carbonyl groups.

[0007] A second aspect of the present invention provides a noise reduction and heat insulation layer made from the noise reduction and heat insulation composition of the present invention, characterized in that the noise reduction and heat insulation layer comprises gas barrier layers and foam material layers arranged alternately and stacked in sequence, and the outermost layer is a gas barrier layer.

[0008] The gas barrier layer is obtained by forming a film of gas barrier layer material;

[0009] The foam material layer is made by splicing together foam material layers.

[0010] A third aspect of the present invention provides an application of the noise reduction and heat insulation layer described herein in noise reduction and heat insulation of pipelines used in petrochemical industries.

[0011] Through the above technical solution, in the pipe noise reduction and thermal insulation composition of the present invention, the superhydrophobic melamine porous material is obtained by hydrophobic modification of melamine porous material. The hydrophilic groups on the melamine porous material are transformed into hydrophobic groups. Therefore, the superhydrophobic melamine porous material retains high porosity and low thermal conductivity while possessing superhydrophobic properties. Compared with traditional thermal insulation materials and structures, the superhydrophobic melamine porous material in the pipe noise reduction and thermal insulation composition will not absorb moisture over time, thus preventing a decrease in the thermal insulation effect of the composition. In addition, the "sandwich" structure in the noise reduction and thermal insulation layer can effectively suppress heat exchange caused by air convection, further improving the thermal insulation performance of the material.

[0012] Meanwhile, due to the rich porosity and pore structure of superhydrophobic melamine porous materials, the propagation of sound waves in different pore structures and the coordinated vibration with the porous material skeleton convert the energy of the sound waves into heat energy dissipation, giving the composition good noise reduction performance. Attached Figure Description

[0013] Figure 1 These are physical images and scanning electron microscope images of the microstructure of the superhydrophobic melamine porous material prepared in Example 1.

[0014] Figure 2 shows the infrared spectra of the melamine porous material matrix, the superhydrophobic melamine porous materials of Preparation Example 1, Preparation Example 9, and Preparation Example 10. Figure 2-B , Figure 2-C for Figure 2-A (A magnified view of a portion of the image);

[0015] Figure 3 Thermogravimetric curves of the unmodified melamine porous material, the superhydrophobic melamine porous materials of Preparation Example 1 and Preparation Example 2 are shown.

[0016] Figure 4 These are physical images and scanning electron microscope images of the microstructure of the superhydrophobic melamine porous material prepared in Example 10;

[0017] Figure 5 These are physical images of the melamine porous material matrix and scanning electron microscope (SEM) images of its microstructure.

[0018] Figure 6 This is a structural diagram of a pipe noise reduction and heat insulation composition provided in one embodiment of the present invention.

[0019] Explanation of reference numerals in the attached figures

[0020] 1—First gas barrier layer; 2—First foaming material layer

[0021] 3—Second gas barrier layer; 4—Second foaming material layer

[0022] 5—Third gas barrier layer Detailed Implementation

[0023] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0024] The first aspect of the present invention provides a noise reduction and heat preservation composition, the composition comprising a gas barrier layer material and a foaming material layer material;

[0025] The foamed material layer is selected from superhydrophobic melamine porous materials; the superhydrophobic melamine porous materials contain hydrophobic groups, including carbonyl groups. Compared with commonly used rock wool, the noise-reducing and heat-insulating layer prepared using the noise-reducing and heat-insulating composition of the present invention can absorb sound waves to reduce noise while maintaining heat insulation. In addition, it has excellent hydrophobic properties and does not exhibit significant moisture absorption over time, resulting in good noise-reducing and heat-insulating durability.

[0026] In this invention, there is no particular limitation on the gas barrier layer material, as long as it can suppress gas thermal convection. According to a preferred embodiment of the present invention, the gas barrier layer material is selected from one or more of polyethylene, polypropylene, polyester, nylon, aluminum, iron, copper and tin.

[0027] In this invention, the carbonyl group is obtained by converting the free amino group in the melamine backbone of the melamine porous material, and the carbonyl group is located on the melamine backbone.

[0028] In this invention, the superhydrophobic melamine porous material has flame-retardant and temperature-resistant properties. According to a preferred embodiment of this invention, the superhydrophobic melamine porous material has a UL-94 vertical burning test rating of V-0.

[0029] In this invention, the superhydrophobic melamine porous material has superhydrophobic properties. According to a preferred embodiment of this invention, the static planar contact angle of the superhydrophobic melamine porous material with water in air is not less than 125°, preferably not less than 135°.

[0030] According to a preferred embodiment of the present invention, the static contact angle of the superhydrophobic melamine porous material with white oil is not higher than 20°, preferably not higher than 10°.

[0031] According to a preferred embodiment of the present invention, the superhydrophobic melamine porous material has through pores.

[0032] In this invention, the pore size of the superhydrophobic melamine porous material can be selected from a wide range. According to a preferred embodiment of this invention, the pore size of the superhydrophobic melamine porous material is 50-800 μm, preferably 100-400 μm.

[0033] In this invention, the porosity of the superhydrophobic melamine porous material can be selected from a wide range. According to a preferred embodiment of this invention, the porosity of the superhydrophobic melamine porous material is greater than or equal to 80%, preferably greater than or equal to 93%, and more preferably 93%-98%. This is beneficial for improving thermal insulation performance, reducing water absorption rate, and improving noise reduction performance.

[0034] In this invention, all superhydrophobic melamine porous materials possessing the aforementioned properties can achieve the objectives of this invention, and there are no special requirements for their preparation methods. Regarding this invention, according to a preferred embodiment, this invention provides a method for preparing the aforementioned superhydrophobic melamine porous material, the method comprising:

[0035] The superhydrophobic melamine porous material was obtained by contacting the melamine porous material matrix with an acid solution, followed by microwave irradiation, washing, and drying.

[0036] The contact time is 0.5s-100s;

[0037] Microwave irradiation conditions include: irradiation power of 100-2000W; irradiation time of 20s-20min. In this invention, the preparation method of the superhydrophobic melamine porous material described herein is used. After the hydrophilic groups in the melamine porous material matrix selectively absorb microwave energy, they partially hydrolyze into hydrophobic groups. The hydrophilic groups on the melamine porous material are transformed into hydrophobic groups. Therefore, the superhydrophobic melamine porous material retains high porosity and low thermal conductivity while exhibiting superhydrophobic properties and good noise reduction performance.

[0038] In the melamine porous material matrix, the free amino groups in the melamine skeleton and the ether bonds connecting the melamine skeleton are all hydrophilic groups. In this invention, the hydrophobic groups are obtained by hydrolysis of the hydrophilic groups in the melamine porous material matrix. According to a preferred embodiment of the present invention, the hydrolysis rate is 5%-85%, preferably 10%-60%, and more preferably 15%-50%. A hydrolysis rate in the range of 15%-50% is beneficial to improve the thermal insulation performance, reduce the water absorption rate, and improve the noise reduction performance.

[0039] According to a preferred embodiment of the present invention, the hydrophilic group is selected from ether bonds and amino groups.

[0040] After selectively absorbing microwave energy, the hydrophilic groups in the melamine porous material matrix partially hydrolyze into hydrophobic groups, and the free amino groups in the melamine skeleton are converted into carbonyl groups; the ether bonds (~HN-COC-NH~) connecting the melamine skeleton are converted into ~HN-CH2-NH~ structures.

[0041] In this invention, the purpose of the invention can be achieved with an acid solution concentration in the range of 0.01-3 mol / L. For example, it can be 0.08 mol / L, 0.1 mol / L, 0.2 mol / L, 0.3 mol / L, 0.4 mol / L, 0.5 mol / L, 0.6 mol / L, 0.7 mol / L, 0.8 mol / L, 0.9 mol / L, 1.0 mol / L, 1.2 mol / L, 1.5 mol / L, or 1.8 mol / L. Preferably, the acid solution concentration is 0.05-2 mol / L, and more preferably 0.05-1.5 mol / L, which is beneficial to improving the oil and gas adsorption efficiency of the superhydrophobic melamine porous material during long-term operation.

[0042] According to a preferred embodiment of the present invention, the contact time is 0.5s-10s, for example, it can be 0.8s, 1.0s, 2.0s, 3.0s, 4.0s, 5.0s, 6.0s, 7.0s, 8.0s, or 9.0s.

[0043] In this invention, microwave irradiation power ranging from 100 to 2000W can achieve the purpose of this invention. For example, it can be 200W, 300W, 400W, 500W, 600W, 700W, 900W, 1000W, 1100W, 1200W, 1300W, 1400W, 1500W, 1600W, or 1700W, preferably 100-1800W.

[0044] In this invention, the microwave irradiation can be carried out in various microwave reactors that are already available in the prior art.

[0045] According to a preferred embodiment of the present invention, the microwave irradiation conditions include an irradiation time of 2 min to 10 min.

[0046] In this invention, there is no particular limitation on the type of acid. According to a preferred embodiment of the invention, the acid in the acid solution is selected from one or more inorganic acids and organic acids.

[0047] According to a preferred embodiment of the present invention, the inorganic acid is selected from at least one of hydrochloric acid, nitric acid, sulfuric acid, hydrofluoric acid, boric acid and phosphoric acid, preferably at least one of hydrochloric acid and sulfuric acid;

[0048] According to a preferred embodiment of the present invention, the organic acid is selected from at least one of acetic acid, citric acid, formic acid and oxalic acid, preferably citric acid and / or acetic acid.

[0049] According to a preferred embodiment of the present invention, the acid is selected from one or more of hydrochloric acid, citric acid, acetic acid and sulfuric acid.

[0050] According to a preferred embodiment of the present invention, the acid is selected from one or more of hydrochloric acid, citric acid, acetic acid and sulfuric acid; the acid concentration is 0.05-0.5 mol / L; the contact time between the melamine porous material matrix and the acid solution is 2s-10s; the microwave irradiation time is 2min-10min; the preparation of superhydrophobic melamine porous material by the above method is beneficial to improve the thermal insulation performance, reduce the water absorption rate and improve the noise reduction performance.

[0051] In this invention, there is no particular limitation on the contact method, as long as the acid solution can be fully contacted with the skeleton of the melamine porous material matrix. The contact method includes, but is not limited to, immersion, rinsing, spraying, etc. Immersion is preferred, so that the acid solution can be more evenly distributed in the sponge skeleton.

[0052] According to a preferred embodiment of the invention, the contact causes the melamine porous material matrix to become saturated or supersaturated with the liquid; the preferred contact method is immersion, rinsing or spraying, and more preferably immersion.

[0053] According to a preferred embodiment of the present invention, the melamine porous material matrix is ​​completely immersed in an acid solution for the contact, and then removed and subjected to microwave irradiation.

[0054] In this invention, washing is used to remove hydrolysis products and acids from the surface of the material. There are no particular limitations on the washing conditions and the amount of detergent used. In the implementation of this invention, washing with deionized water until the washing solution is neutral is used as an example, but this does not limit the scope of this invention.

[0055] In this invention, there are no particular limitations on the drying conditions, as long as the solvent after washing is removed without damaging the structure of the superhydrophobic melamine porous material. According to a preferred embodiment of the present invention, the drying conditions include: a drying temperature of 60-100°C and a drying time of 5-120 min. In the implementation of the present invention, drying at 60°C for 10 min is used as an example, but this does not limit the scope of the present invention.

[0056] In this invention, there is no particular limitation on the drying method. According to a preferred embodiment of the invention, the drying method is selected from vacuum drying, forced air drying or microwave drying; more preferably, microwave drying is preferred because it has higher evaporation efficiency and is more energy-efficient.

[0057] In this invention, after the melamine porous material matrix is ​​hydrolyzed and modified to obtain the superhydrophobic melamine porous material, it can basically maintain the excellent properties of the matrix itself. For example, the long-term temperature range of the superhydrophobic melamine porous material is -150-200℃; for example, the UL-94 vertical burning test rating of the superhydrophobic melamine porous material is V-0.

[0058] A second aspect of the present invention provides a noise reduction and heat insulation layer made from the noise reduction and heat insulation composition of the present invention, characterized in that the noise reduction and heat insulation layer comprises a barrier layer and a foaming material layer arranged alternately and stacked in sequence, and the outermost layer is a gas barrier layer.

[0059] The gas barrier layer is obtained by forming a film of gas barrier layer material;

[0060] The foamed material layer is formed by splicing together foamed material layers. The noise-reducing and heat-insulating layer can absorb sound waves to reduce noise while keeping the room warm. In addition, it has excellent hydrophobic properties and will not absorb moisture significantly with the increase of use time, resulting in good noise reduction and heat insulation durability. The "sandwich" structure in the noise-reducing and heat-insulating layer can effectively suppress heat exchange caused by air convection, further improving the heat insulation performance of the material.

[0061] In this invention, there are no particular limitations on the film-forming method of the gas barrier layer material. For example, the gas barrier layer can be made of polyethylene film, polypropylene film, polyester film, nylon film, aluminum foil, iron sheet, copper sheet, tin foil, etc., prepared from polyethylene, polypropylene, polyester, nylon, aluminum, iron, copper, tin, etc.

[0062] In this invention, there are no particular limitations on the method of preparing the foam material layer, as long as the foam material is sandwiched between the two gas barrier layers; the splicing can be, for example, cutting and bonding.

[0063] In this invention, there is no particular limitation on the number of gas barrier layers and foam material layers in the noise reduction and heat insulation layer, as long as the gas barrier layers and foam material layers are stacked and alternately arranged in sequence, and the outermost layer is a barrier layer; for example, according to one embodiment of the invention, the noise reduction and heat insulation layer has a 3-layer structure including a gas barrier layer, a foam material layer, and a gas barrier layer stacked in sequence; for example, according to one embodiment of the invention, the noise reduction and heat insulation layer has a 5-layer structure including a gas barrier layer, a foam material layer, a gas barrier layer, a foam material layer, and a gas barrier layer stacked in sequence; for example, according to one embodiment of the invention, the noise reduction and heat insulation layer has a 7-layer structure including a gas barrier layer, a foam material layer, a gas barrier layer, a foam material layer, a gas barrier layer, a foam material layer, and a gas barrier layer stacked in sequence.

[0064] According to a preferred embodiment of the present invention, such as Figure 1As shown, the noise reduction and heat insulation layer has a 5-layer structure, including a first gas barrier layer 1, a first foam material layer 2, a second gas barrier layer 3, a second foam material layer 4, and a third gas barrier layer 5 stacked in sequence.

[0065] According to a preferred embodiment of the present invention, the thickness of each gas barrier layer is 5-20 μm.

[0066] According to a preferred embodiment of the present invention, the thickness of each foam material layer is 20-100 mm.

[0067] According to a preferred embodiment of the present invention, the thicknesses of the first gas barrier layer, the second gas barrier layer, and the third gas barrier layer are each 5-20 μm.

[0068] According to a preferred embodiment of the present invention, the thickness of the first foaming material layer and the second foaming material layer is 20-100 mm respectively.

[0069] According to a preferred embodiment of the present invention, the thickness ratio of the gas barrier layer to the foamed material layer is 1:1000-10000. This is beneficial for improving noise reduction and heat insulation performance.

[0070] In this invention, the noise reduction and heat insulation layers are stably connected to each other, and there is no particular limitation on the connection method. According to a preferred embodiment of this invention, the noise reduction and heat insulation layers are bonded together by an adhesive. Preferably, the adhesive is selected from one or more polymer adhesives, more preferably from one of silicone, acrylic or polyurethane, and preferably silicone.

[0071] A third aspect of the present invention provides an application of the noise reduction and heat insulation layer described herein in noise reduction and heat insulation of pipelines used in petrochemical industries.

[0072] According to a preferred embodiment of the present invention, the thickness of the foamed material layer in the noise reduction and heat insulation layer is set to 0.1-1 times the outer diameter of the pipe.

[0073] The present invention will be described in detail below through embodiments.

[0074] In the following embodiments, the water absorption rate of the pipe noise reduction and insulation composition or the pipe noise reduction and insulation layer is measured by the mass increase rate of the composition or the pipe noise reduction and insulation layer before and after use.

[0075] In the following embodiments, the pipeline insulation and noise reduction test steps are as follows: the third gas barrier layer is the inner layer, and the first gas barrier layer is the outermost layer covering the pipeline. The outer diameter of the pipeline is 100mm, the outer temperature is 90.0℃, and the ambient temperature is 13.6℃. The pipeline insulation and noise reduction layer is wrapped with the same length as the pipeline, and the temperature and noise level of the outermost layer of the insulation material are tested after seven days.

[0076] In the context of this specification, including the following examples, the hydrolysis rate of the hydrophilic group was calculated by Agilent Micro-Infrared Spectroscopy using the ATR test mode. (Measured at 1625±5 cm⁻¹) -1 The fitted peak area at 1480 cm⁻¹ divided by 1480 cm⁻¹ -1 The ratio of the fitted peak area (S) is correlated with the hydrolysis rate (H). The hydrolysis rate of the unmodified sponge is 0%, and the hydrolysis rate of the fully hydrolyzed sample, i.e., the infrared peak area ratio does not increase with the modification time, is 100%. The calculation yields H = 1.2S * 100%, and then the hydrolysis rate is obtained according to the formula and the test ratios of various embodiments.

[0077] In the context of this specification, including the following embodiments, the vertical flammability test rating is tested according to the UL94 flame retardant test method.

[0078] In the context of this specification, including the following embodiments, the water contact angle parameter is measured using an EASY DROP contact angle tester from KRUSS GmbH, Germany, with a measurement range of 1-180° and a resolution of ±0.1°. The static contact angle measurement mode is used, with a fixed volume of 2μL of water or white oil droplets dropped onto the porous material each time. The calculated initial contact angle is taken as the contact angle measurement value of the porous material surface. Six parallel measurements are performed, and the average value is calculated.

[0079] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. The specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention in any way. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concepts of this disclosure. Such structures and techniques have also been described in many publications.

[0080] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0081] In the following examples, the melamine porous material matrix was purchased from Beiyou Building Materials and is a melamine porous material with through pores.

[0082] Preparation Example 1

[0083] Prepare a 0.05 mol / L hydrochloric acid aqueous solution, immerse the melamine porous material matrix (porosity 95%, average pore size 100 μm) in the solution for 2 seconds, then remove it. After irradiation with 800 W microwave power for 4 minutes, remove it, wash with deionized water until the pH is neutral, microwave dry at 60℃ for 10 minutes to obtain superhydrophobic melamine porous material S1.

[0084] In the superhydrophobic melamine porous material S1, the hydrolysis rate of the hydrophilic groups is 18%, the average pore size is 100μm, the porosity is 95%, the UL94 vertical flammability rating is V-0, the contact angle to white oil is 0°, and the contact angle to water is 138.3°.

[0085] Physical images and SEM images of the superhydrophobic melamine porous material S1 are shown below. Figure 1 As shown, compared to the melamine porous material matrix (physical image and SEM image as shown) Figure 5 As shown in the figure, neither the porous material skeleton nor the overall size of the porous material changed significantly.

[0086] Figure 2 shows the infrared spectra of superhydrophobic melamine porous materials S1, S9, and S10, and the unmodified melamine porous material matrix. The 1628 cm⁻¹ value is among the 1628 cm⁻¹ values. -1 The characteristic peak at 1480 cm⁻¹ is a new peak generated after modification, that is, the characteristic peak of the hydrophobic group. -1 The peak at this point is the stretching vibration peak of the melamine ring. Since the modification did not destroy the melamine ring, its intensity remains unchanged. The area of ​​this peak can be used to characterize the initial content of hydrophilic groups.

[0087] Infrared spectrum as follows Figure 2-A ( Figure 2-B , Figure 2-C for Figure 2-A (A close-up view), 1540cm -1 This is the CN stretching vibration. According to the S9, S1, and S10 peaks, as the hydrolysis rate of the melamine porous material matrix increases and the degree of modification increases, this peak gradually weakens, while the peak at 1624 cm⁻¹... -1 The peak represents the stretching vibration of cyclic amides. This peak gradually increases, suggesting that the free amino groups on melamine-formaldehyde resin gradually hydrolyze into hydroxyl groups under acidic conditions. The hydroxyl groups on the melamine ring are unstable and exist as isomers of lactams.

[0088] In infrared spectrum 2C, 1141 cm⁻¹ -1 and 967cm -1The absorption peaks are symmetric and antisymmetric in the COC bond. The intensity of these two absorption peaks gradually decreases with the increase of the hydrolysis rate of the melamine porous material matrix and the degree of modification, according to S9, S1, and S10, until they disappear. This indicates that after the melamine porous material matrix is ​​modified, the NCOCN structure in the melamine-formaldehyde sponge undergoes a deformaldehyde reaction to generate the NCN structure.

[0089] Preparation Example 2

[0090] Prepare a 0.5 mol / L hydrochloric acid aqueous solution, immerse the melamine porous material matrix (porosity 93%, average pore size 300 μm) in it for 5 s, then remove it and irradiate it with a microwave irradiation power of 1800 W for 2 min. After washing with deionized water until the pH is neutral, microwave dry it at a temperature of 80 °C for 80 min to obtain the superhydrophobic melamine porous material S2.

[0091] The infrared spectrum of the superhydrophobic melamine porous material S2 is similar to that of Preparation Example 1, with a hydrolysis rate of 50% for the hydrophilic groups. The superhydrophobic melamine porous material S2 has an average pore size of 300 μm, a porosity of 93.2%, a UL94 vertical flammability rating of V-0, a white oil contact angle of 0°, and a water contact angle of 145.3°.

[0092] Figure 3 The graphs show the thermogravimetric curves of superhydrophobic porous materials S1 and S2 and the unmodified melamine porous material matrix. As can be seen from the graphs, S1 and S2 have good temperature resistance, indicating that the temperature resistance of the modified materials remains unchanged below 200℃.

[0093] Preparation Example 3

[0094] Prepare a 0.25 mol / L citric acid aqueous solution, immerse the melamine porous material matrix (porosity 96%, average pore size 400 μm) in the solution for 10 s, then remove it, irradiate it with a microwave power of 200 W for 10 min, wash it with deionized water until the pH is neutral, microwave dry it at a temperature of 60 °C for 50 min, and then remove it to obtain the superhydrophobic melamine porous material S3.

[0095] The infrared spectrum of the superhydrophobic melamine porous material S3 is similar to that of Preparation Example 1, with a hydrolysis rate of 35% for the hydrophilic groups. The superhydrophobic melamine porous material S3 has an average pore size of 400 μm, a porosity of 96.6%, a UL94 vertical flammability rating of V-0, a white oil contact angle of 0°, and a water contact angle of 141.3°.

[0096] Preparation Example 4

[0097] The method of Preparation Example 3 was followed, except that a 0.25 mol / L boric acid solution was used instead of a 0.25 mol / L citric acid aqueous solution; the other conditions were the same as in Preparation Example 3, and the superhydrophobic melamine porous material S4 was obtained.

[0098] The infrared spectrum of the superhydrophobic melamine porous material S4 is similar to that of Preparation Example 1, with a hydrolysis rate of 20% for the hydrophilic groups. In the superhydrophobic melamine porous material S4, the average pore size is 400 μm, the porosity is 96.1%, the UL94 vertical flammability rating is V-0, the contact angle to white oil is 0°, and the contact angle to water is 128.5°.

[0099] Preparation Example 5

[0100] A 2 mol / L oxalic acid aqueous solution was prepared, and the melamine porous material matrix (porosity 95%, average pore size 100 μm) was immersed in it for 50 s and then removed. After that, it was irradiated with microwave power of 1800 W for 2 min and then removed. It was washed with deionized water until the pH was neutral, microwave dried, and the drying temperature was controlled at 60℃. After drying for 10 min, the superhydrophobic melamine porous material S5 was obtained.

[0101] The infrared spectrum of the superhydrophobic melamine porous material S5 is similar to that of Preparation Example 1, with a hydrolysis rate of 58% for the hydrophilic groups. The superhydrophobic melamine porous material S5 has an average pore size of 90 μm, a porosity of 86%, a UL94 vertical flammability rating of V-0, a white oil contact angle of 0°, and a water contact angle of 139.7°.

[0102] Preparation Example 6

[0103] Following the method of Preparation Example 1, except that the microwave irradiation time was 15 min, and the other conditions were the same as in Preparation Example 1, the superhydrophobic melamine porous material S6 was obtained.

[0104] The infrared spectrum of the superhydrophobic melamine porous material S6 is similar to that of Preparation Example 1, with a hydrolysis rate of 56% for the hydrophilic groups. In the superhydrophobic melamine porous material S6, the average pore size is 100 μm, the porosity is 84%, the UL94 vertical flammability rating is V-0, the contact angle to white oil is 0°, and the contact angle to water is 141.0°.

[0105] Example 7

[0106] The method of Preparation Example 1 was followed, except that 0.05 mol / L nitric acid was used instead of 0.05 mol / L hydrochloric acid, and the other conditions were the same as in Preparation Example 1, to obtain the superhydrophobic melamine porous material S7.

[0107] The infrared spectrum of the superhydrophobic melamine porous material S7 is similar to that of Preparation Example 1, with a hydrolysis rate of 14% for the hydrophilic groups. The superhydrophobic melamine porous material S7 has an average pore size of 100 μm, a porosity of 93.3%, a UL94 vertical flammability rating of V-0, a white oil contact angle of 0°, and a water contact angle of 138.7°.

[0108] Preparation Example 8

[0109] The method of Preparation Example 1 was followed, except that the melamine porous material matrix (porosity of 95% and average pore size of 100 μm) was immersed in hydrochloric acid for 90 s and then removed. The other conditions were the same as in Preparation Example 1, and the superhydrophobic melamine porous material S8 was obtained.

[0110] The infrared spectrum of the superhydrophobic melamine porous material S8 is similar to that of Example 1, with a hydrolysis rate of 42% for the hydrophilic groups. The superhydrophobic melamine porous material S8 has an average pore size of 95 μm, a porosity of 88%, a UL94 vertical flammability rating of V-0, a white oil contact angle of 0°, and a water contact angle of 139.2°.

[0111] Preparation Example 9

[0112] Prepare a 0.01 mol / L hydrochloric acid aqueous solution, immerse the melamine porous material matrix in it for 2 seconds, and then remove it. After that, irradiate it with a microwave irradiation power of 200W for 20 seconds and then remove it for microwave drying. Control the drying temperature at 60℃ and dry for 60 minutes to obtain the superhydrophobic melamine porous material S9.

[0113] The infrared spectrum of the superhydrophobic melamine porous material S9 is similar to that of Preparation Example 1, with a hydrolysis rate of 5% for the hydrophilic groups. The superhydrophobic melamine porous material S9 has an average pore size of 100 μm, a porosity of 95%, a UL94 vertical flammability rating of V-0, a white oil contact angle of 0°, and a water contact angle of 82.5°.

[0114] Preparation Example 10

[0115] A 3 mol / L nitric acid aqueous solution was prepared, and the melamine porous material matrix was immersed in it for 60 seconds and then removed. After that, it was irradiated with a microwave irradiation power of 2000W for 10 minutes and then removed for microwave drying. The drying temperature was controlled at 60℃ and dried for 60 minutes to obtain the superhydrophobic melamine porous material S10.

[0116] The infrared spectrum of the superhydrophobic melamine porous material S10 is similar to that of Preparation Example 1, and the hydrolysis rate of the hydrophilic groups is 82%. The superhydrophobic melamine porous material S10 has an average pore size of 67 μm, a porosity of 53%, a UL94 vertical flammability rating of V-0, a white oil contact angle of 0°, and a water contact angle of 147.8°.

[0117] Figure 4Here are the physical images and SEM images of the melamine porous material S10, compared to the superhydrophobic melamine porous material S1 ( Figure 1 The porous material S10 underwent a certain degree of collapse, resulting in a reduction in porosity and pore size. Due to the excessively high hydrolysis rate of the hydrophilic groups, the rigidity of the porous material skeleton was reduced.

[0118] Preparation Example 11

[0119] The method used in Preparation Example 1 differs from that microwave irradiation was not performed; specifically:

[0120] Prepare a 0.05 mol / L hydrochloric acid aqueous solution, immerse the melamine porous material matrix (porosity 95%, average pore size 100 μm) in the solution for 2 seconds, remove it, let it stand for 4 minutes, wash it with deionized water until the pH is neutral, microwave dry it at 60℃ for 10 minutes to obtain melamine porous material D1.

[0121] In melamine porous material D1, the hydrolysis rate of hydrophilic groups is 0, the average pore size is 100 μm, and the porosity is 95%.

[0122] Preparation Example 12

[0123] The method used in Preparation Example 2 differs from that microwave irradiation was not performed; specifically:

[0124] Prepare a 0.5 mol / L hydrochloric acid aqueous solution, immerse the melamine porous material matrix (porosity 93%, average pore size 300 μm) in it for 5 seconds, remove it, let it stand for 2 minutes, wash it with deionized water until the pH is neutral, and then microwave dry it at 80℃ for 80 minutes to obtain melamine porous material D2.

[0125] In melamine porous material D2, the hydrolysis rate of hydrophilic groups is 0%, the average pore size is 300 μm, and the porosity is 93%.

[0126] Examples 1-10 and Comparative Examples 1-2

[0127] according to Figure 6 The gas barrier layer 1, the first foamed material layer 2, the second gas barrier layer 3, the second foamed material layer 4, and the third gas barrier layer 5 are sequentially stacked to form a gas barrier layer. The first gas barrier layer, the second gas barrier layer, and the third gas barrier layer are made of aluminum foil as the barrier material, and the thickness of each of the three layers is 10 μm. The first foamed material layer and the second foamed material layer are made of the superhydrophobic melamine porous material described in Preparation Examples 1-12. The gas barrier layer and the foamed material layer are bonded together with an organosilicon (platinum bridge organosilicon potting compound) adhesive to prepare a noise reduction and heat insulation layer.

[0128] The noise reduction and heat insulation layers prepared in Examples 1-10 and Comparative Examples 1-2 were subjected to pipeline noise reduction and heat insulation tests and water absorption tests. The results are shown in Table 1.

[0129] Comparative Example 3

[0130] The method of Example 1 was followed, except that an unmodified melamine porous material matrix was used and assembled in the manner of Example 1. Pipe noise reduction and heat insulation tests and water absorption tests were conducted, and the results are shown in Table 1.

[0131] Comparative Example 4

[0132] The method of Example 1 is the same, except that the rock wool is assembled in the same way as in Example 1, and pipe noise reduction and heat insulation tests and water absorption tests are conducted. The results are shown in Table 1.

[0133] Table 1

[0134]

[0135] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A noise-reducing insulation composition, characterized in that, The composition comprises a gas barrier layer material and a foamed material layer material; The foamed material layer material is selected from super-hydrophobic melamine porous material; the super-hydrophobic melamine porous material contains hydrophobic groups, and the hydrophobic groups comprise carbonyl groups.

2. The noise-reducing thermal insulation composition according to claim 1, wherein, The super-hydrophobic melamine porous material has a UL-94 vertical burning test rating of V-0; and / or The super-hydrophobic melamine porous material has a static planar contact angle with water in air of no less than 125°, preferably no less than 135°; and / or The super-hydrophobic melamine porous material has a static contact angle with white oil of no more than 20°.

3. The noise-reducing thermal insulation composition according to claim 1 or 2, wherein, The super-hydrophobic melamine porous material has through-holes; Preferably, the super-hydrophobic melamine porous material has a pore size of 50-800 μm, preferably 100-400 μm; and / or The super-hydrophobic melamine porous material has a porosity of no less than 80%, preferably no less than 93%; and / or The hydrophobic groups are obtained by hydrolysis of hydrophilic groups in the melamine porous material matrix, preferably the hydrophilic groups are selected from ether bonds and amino groups; and / or The gas barrier layer material is selected from one or more of polyethylene, polypropylene, polyester, nylon, aluminum, iron, copper and tin.

4. The noise reducing insulation composition of any of claims 1-3, wherein, The method for preparing the super-hydrophobic melamine porous material comprises: contacting the melamine porous material matrix with an acid solution, followed by microwave irradiation, washing and drying to obtain the super-hydrophobic melamine porous material; The contacting time is 0.5 s-100 s; The microwave irradiation conditions comprise: irradiation power of 100-2000 W; irradiation time of 20 s-20 min.

5. The noise-reducing thermal insulation composition according to claim 4, wherein, The hydrophobic groups are obtained by hydrolysis of hydrophilic groups in the melamine porous material matrix, and the hydrolysis rate is 10-60%; preferably the hydrophilic groups are selected from ether bonds and amino groups; and / or The acid solution has a concentration of 0.01-3 mol / L; preferably 0.05-1.5 mol / L; and / or The contacting saturates or over-saturates the melamine porous material matrix with the liquid; preferably the contacting is immersion, leaching or spraying, preferably immersion; and / or The acid in the acid solution is selected from one or more of inorganic acids and organic acids; Preferably, the inorganic acid is selected from at least one of hydrochloric acid, nitric acid, sulfuric acid, hydrofluoric acid, boric acid and phosphoric acid, preferably at least one of hydrochloric acid, nitric acid and sulfuric acid; Preferably, the organic acid is selected from at least one of acetic acid, citric acid, formic acid and oxalic acid; More preferably, the acid is selected from one or more of hydrochloric acid, citric acid, acetic acid and sulfuric acid.

6. A noise-reducing thermal insulation layer made from the noise-reducing thermal insulation composition according to any one of claims 1 to 5, characterized in that The noise-reducing thermal insulation layer comprises gas barrier layers and foamed material layers arranged alternately in sequence, and the outermost layers are both gas barrier layers; The gas barrier layers are obtained by film-forming of a gas barrier layer material; The foamed material layers are obtained by splicing of a foamed material layer material.

7. The noise-reducing thermal insulation layer according to claim 6, wherein, The thickness of each of the gas barrier layers is 5-20 μm; and / or The thickness of each of the foamed material layers is 20-100 mm; Preferably, the thickness ratio of the gas barrier layers to the foamed material layers is 1:1000-10000.

8. The noise-reducing thermal insulation layer according to claim 6 or 7, wherein, the noise-reducing thermal insulation layer is bonded between layers by an adhesive, preferably, the adhesive is selected from one or more of high molecular adhesives, more preferably selected from one of silicone, acrylic or polyurethane, preferably silicone.

9. The noise-reducing thermal insulation layer according to any one of claims 6-8, wherein, the noise-reducing thermal insulation layer comprises a first gas barrier layer, a first foamed material layer, a second gas barrier layer, a second foamed material layer and a third gas barrier layer stacked in sequence; preferably, the thickness of the first gas barrier layer, the second gas barrier layer and the third gas barrier layer is 5-20 μm respectively; the thickness of the first foamed material layer and the second foamed material layer is 20-100 mm respectively.

10. Use of the noise-reducing thermal insulation layer according to any one of claims 6-9 in noise reduction and thermal insulation of pipelines for petrochemical industry; preferably, in the noise-reducing thermal insulation layer, the thickness of the foamed material layer is set to 0.1-1 times of the outer diameter of the pipeline.

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