High-density flame-retardant damping rubber sheet and its application in suppressing high-frequency vibration

Abstract

The present application relates to a kind of high-density flame-retardant damping rubber sheet and its application in inhibiting high-frequency vibration.The present application is prepared by using high-frequency vibration absorber A (metal powder) and B (hydroxyl-containing polymer) in butyl rubber compound, and the damping rubber sheet formed by the high-density butyl rubber compound after being compounded with O-state aluminum foil by extrusion molding can exhibit good absorption and inhibition characteristics to the vibration excited by ultrasonic wave (51 kHz) when being attached to thin steel plate.Meanwhile, due to high filling amount (up to 80%), low organic content, fire self-extinguishing, it has good flame-retardant characteristics.

Description

Technical Field

[0001] This invention belongs to the field of damping materials, specifically relating to a high-density flame-retardant damping film and its application in suppressing high-frequency vibrations. Background Technology

[0002] Automatic doors in intelligent connected vehicles are typically equipped with ultrasonic radar or millimeter-wave radar. Ultrasonic radar has become an important solution for automatic door opening in intelligent connected vehicles due to its ability to penetrate metal and its cost advantage.

[0003] The radar is mounted close to the inside of the door panel. When the ultrasonic transducer emits ultrasonic signals (usually 51kHz), the door panel vibrates, generating a high-frequency resonance signal. This signal, along with the ultrasonic signal reflected back from obstacles, is received by the receiver, causing interference. The current practice is to attach a butyl damping sheet between the radar and the door panel to suppress the high-frequency resonance signal, thereby preventing the radar from misjudging obstacles.

[0004] Car door panels are made of aluminum or steel. Aluminum has low acoustic impedance, low density, and high ultrasonic wave propagation rate, allowing even low-intensity ultrasonic signals to penetrate it. Steel, on the other hand, has high acoustic impedance, high density, and low propagation rate, requiring stronger ultrasonic signals. The trend towards lightweight vehicles has led to the widespread use of thin steel sheets (0.7mm or 0.65mm). Suppressing high-frequency resonance signals in thin steel door panels has become a challenge, and currently, no mature damping vibration reduction solutions have been reported or publicly disclosed.

[0005] The high-density flame-retardant damping film involved in this invention can effectively suppress high-frequency resonance signals in thin metal door panels, including thin steel plates. Summary of the Invention

[0006] The purpose of this invention is to address the problem of difficulty in suppressing high-frequency resonance signals in thin steel door panels by providing a high-density flame-retardant damping film and its application in suppressing high-frequency vibrations.

[0007] The objective of this invention can be achieved through the following methods:

[0008] This invention provides a high-density flame-retardant damping film, which comprises, from top to bottom, an isolation layer, a high-density butyl damping layer, and a confinement layer. The high-density butyl damping layer is made of butyl or halogenated butyl rubber, a high-frequency vibration absorber, and a high-density filler. The high-frequency vibration absorber comprises metal powder of 800 mesh or higher and hydroxyl-containing polymers; the high-density filler is precipitated barium sulfate or natural barium sulfate.

[0009] As one embodiment of the present invention, the isolation layer is a release film or release paper, preferably release paper; the thickness of the isolation layer is 0.05-0.2 mm.

[0010] In one embodiment of the present invention, the density of the high-density butyl damping layer is 2.0-3.5 g / cm³. 3 The preferred value is 2.6-3.0 g / cm³. 3 The thickness of the high-density butyl damping layer is 1.0-5.0 mm, preferably 1.5-3.5 mm. The density of ordinary butyl damping adhesive is usually below 1.7, and damping adhesive layers with a density below 2.0 cannot suppress high-frequency vibrations, causing radar to detect clutter. The high density of the butyl damping adhesive of this invention is achieved by adding a certain proportion of high-density high-frequency absorber A iron powder and high-density filler barium sulfate.

[0011] In one embodiment of the present invention, the limiting layer comprises one of fiberglass cloth, H-state aluminum plate, and O-state aluminum plate; the thickness of the limiting layer is 0.05-0.7 mm. Preferably, it is an O-state aluminum plate with a thickness of 0.1-0.2 mm.

[0012] As one embodiment of the present invention, the high-density butyl damping layer comprises the following components in parts by mass:

[0013]

[0014] As one embodiment of the present invention, the butyl or halogenated butyl rubber has a Mooney viscosity of 40-70, including one or more of Yanshan Petrochemical 1751, Russian 1675N, JSR 268, Exxsonmobile 2255, LanXess X-butyl BB X2, and Xinhui chlorinated butyl rubber 1301.

[0015] As one embodiment of the present invention, the molecular weight Mw of the liquid polyisobutylene is 1000-1500 Dalton, including one or more of Daelim PB1300 from South Korea and HRD-13 from Shandong Hongrui.

[0016] As one embodiment of the present invention, the mineral oil includes one or more of white oil and naphthenic oil, wherein the white oil is selected from one or more of Zhejiang Zhengxin 50# white oil and Sinopec white oil KN4010.

[0017] As one embodiment of the present invention, the stearic acid has an acid value of 205-210 mgKOH / g and can be industrial grade stearic acid.

[0018] In one embodiment of the present invention, the zinc oxide is indirect zinc oxide, conforming to GB / T3185 Grade I, such as indirect zinc oxide for general rubber vulcanization, including one or more of Shanghai Oucheng Zinc Industry's zinc oxide-121 and Shanghai Yuanjiang Chemical Co., Ltd.'s Yuanjiang brand rubber-specific zinc oxide. The diameter of zinc oxide particles produced by the indirect method is 0.1-10 micrometers, with a purity between 99.5-99.7%, indicating high purity. Rubber tires generally use zinc oxide produced by this method. Direct zinc oxide is mostly produced from zinc ash, and its effect on promoting rubber vulcanization is inferior to that of the indirect method; its products are mostly used in ceramics and other fields.

[0019] As one embodiment of the present invention, the pigment is a color powder, including one or more of titanium dioxide, iron oxide red, and pigment carbon black, preferably Henan Xinjin Pigment Carbon Black 112, which has an oil absorption value of 70 or higher and a blackness of 38 or higher.

[0020] As one embodiment of the present invention, the high-frequency vibration absorber A is a metal powder of 800 mesh or higher, such as 800 mesh iron powder.

[0021] As one embodiment of the present invention, the high-frequency vibration absorber B is a hydroxyl-containing polymer with a hydroxyl content of 8% or more, including one or two of corn starch and polyethylene glycol PEG400.

[0022] The working principles of high-frequency vibration absorbers A and B in this invention are as follows: High-frequency vibration absorber A is a metal powder, especially iron powder, which absorbs ultrasonic waves with frequencies greater than 20kHz, particularly 30-55kHz. This absorption originates from the resonance of the iron powder particles and the high acoustic impedance of the iron powder itself. High-frequency vibration absorber B is a polymer containing polar groups such as hydroxyl groups. Its polar hydroxyl bonds can absorb ultrasonic waves with frequencies of 30-55kHz (wavelengths of 5-20mm) and convert them into heat energy.

[0023] As one embodiment of the present invention, the high-density filler is precipitated barium sulfate or natural barium sulfate, with a mesh size of 1250 mesh or above, preferably precipitated barium sulfate of 1250 mesh.

[0024] As one embodiment of the present invention, the tackifying resin includes one or more of C5 resin, C9 modified C5 resin, and hydrogenated C5 resin; the softening point of the tackifying resin is 90-100℃, including one or more of Eastman's Piccotac 9095, Exxon's ESCOREZ 2203LC, and Luhua's A1100.

[0025] As one embodiment of the present invention, the vulcanizing resin is a phenolic resin with a softening point of 100-110℃ and a hydroxymethyl content of 10-16%, including one or more of domestic tert-butylphenolic resin 2402 and SI GROUP's FRJ-551.

[0026] This invention also provides a method for preparing a high-density flame-retardant damping film, the method comprising the following steps:

[0027] S1. Knead butyl or halogenated butyl rubber, liquid polyisobutylene, mineral oil, stearic acid, zinc oxide, pigment, high-frequency vibration absorber A, high-frequency vibration absorber B, high-density filler, and tackifying resin until uniform and free of particles. After cooling, add vulcanizing resin, stir evenly, and extrude to obtain high-density butyl damping layer slurry.

[0028] S2. After cooling the slurry obtained in step S1, feed it into an extruder and extrude it onto the first isolation layer. Then, it is laminated with the third limiting layer. After cutting, the high-density flame-retardant damping film is obtained.

[0029] In one embodiment of the present invention, in step S1, the kneading temperature is 80-130°C, and the time is 20-60 minutes; the kneading is carried out in a 600L kneader. The cooling temperature is below 80°C; the stirring time is 4-6 minutes.

[0030] In one embodiment of the present invention, in step S2, the cooling temperature is 35-65°C; the barrel temperature of the extruder is 60-80°C. After lamination, it is cut to a certain size and shape.

[0031] This invention also provides an application of the high-density butyl damping layer in the preparation of patches for suppressing high-frequency vibrations. Specifically, when a damping patch containing the butyl damping layer is applied to the inside of an automotive exterior sheet metal unit equipped with an ultrasonic radar, it effectively absorbs and suppresses the ultrasonic waves themselves, as well as the high-frequency resonance excited by the radar, thereby preventing the radar receiver from receiving ultrasonic noise signals returned from non-obstacles and misinterpreting the signal. The isolation layer is peeled off and discarded during use, exposing the self-adhesive damping layer, which is then pressed and bonded to the substrate (usually sheet metal). Without the protective isolation layer, the self-adhesive damping layer cannot be protected.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] (1) The butyl rubber compound containing the combination of high-frequency vibration absorbers A and B of the present invention is extruded into a 2.9 mm sheet and then combined with a 0.1 mm O-state aluminum foil to form a damping film, which is then bonded to a 0.7 mm steel plate. It was found that this high-density film exhibits good absorption and suppression characteristics for vibrations excited by ultrasonic waves (51 kHz).

[0034] (2) The high-density flame-retardant damping film of the present invention has good flame-retardant properties because it has a high filling amount of high-frequency vibration absorber (up to 80%) and low organic content, and can self-extinguish when removed from the flame. Attached Figure Description

[0035] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0036] Figure 1 This is a schematic diagram of the creep-resistant waterproof insulating tape of the present invention. Detailed Implementation

[0037] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The following examples are implemented under the premise of the technical solution of the present invention, providing detailed implementation methods and specific operating procedures, which will help those skilled in the art to further understand the present invention. It should be noted that the scope of protection of the present invention is not limited to the following embodiments; any adjustments and improvements made under the concept of the present invention are all within the scope of protection of the present invention.

[0038] Example 1

[0039] This embodiment provides a high-density flame-retardant damping film, such as Figure 1 As shown, it includes, in sequence, an isolation layer, a high-density butyl damping layer, and a confinement layer.

[0040] The butyl rubber compound in the high-density butyl damping layer contains the following components in the indicated weight proportions:

[0041] Yanshan Petrochemical 1751 (Mounney viscosity 51): 3.5 parts;

[0042] Dahlin PB1300 (molecular weight Mw 1300 Dalton): 6.7 parts;

[0043] 50# white oil: 2.5 parts;

[0044] Industrial grade stearic acid (acid value 207 mg KOH / g): 0.5 parts;

[0045] Indirect zinc oxide: 0.5 parts;

[0046] Carbon black 112 (oil absorption value 70, blackness 38): 1 part;

[0047] Iron powder, 800 mesh: 80 parts;

[0048] Corn starch (hydroxyl content 36%): 3 parts;

[0049] Eastman Piccotac 9095 (softening point 96°C): 2 parts;

[0050] Tert-butylphenol resin FRJ-551 (softening point 105℃, hydroxymethyl content 13%): 0.3 parts.

[0051] The above-mentioned Yanshan Petrochemical 1751, liquid polyisobutylene Dalin PB1300, mineral oil (white oil), stearic acid, zinc oxide, carbon black, iron powder, corn starch, and Eastman Piccotac 9095 tackifying resin were put into a 600L kneader and kneaded at a temperature of 95-105℃ for 40 minutes. After stirring until uniform and free of particles, the mixture was cooled to below 80 degrees and tert-butylphenol resin FRJ-551 was added. The mixture was stirred evenly (about 5 minutes) and extruded into a turnover box. After cooling to a material temperature of 35-65℃, the mixture was fed into an extruder. The barrel temperature was 65-75℃. The mixture was extruded onto the first layer of release paper (0.1mm thick) (adhesive thickness 2.9mm), and then onto the third layer of O-state aluminum plate (0.1mm thick). After cutting, a damping film with dimensions of 3mm*300mm*300mm was obtained.

[0052] Example 2

[0053] This embodiment provides a high-density flame-retardant damping film, which includes, from top to bottom, an isolation layer, a high-density butyl damping layer, and a confinement layer.

[0054] The butyl rubber compound in the high-density butyl damping layer contains the following components in the indicated weight proportions:

[0055] Exxsonmobile 2255 (Mounney viscosity 46): 3.5 parts;

[0056] Dahlin PB1300 (molecular weight Mw 1300 Dalton): 6.7 parts;

[0057] 50# white oil: 2.5 parts;

[0058] Industrial grade stearic acid (acid value 207 mg KOH / g): 0.5 parts;

[0059] Indirect zinc oxide: 0.5 parts;

[0060] Carbon black 112 (oil absorption value 70, blackness 38): 1 part;

[0061] Iron powder, 800 mesh: 80 parts;

[0062] PEG400 (hydroxyl content 8.5%): 3 parts;

[0063] Eastman Piccotac 9095 (softening point 96°C): 2 parts;

[0064] Tert-butylphenol resin FRJ-551 (softening point 105℃, hydroxymethyl content 13%): 0.3 parts.

[0065] The above-mentioned Exxsonmobile 2255; liquid polyisobutylene Dahlin PB1300, mineral oil (white oil), stearic acid, zinc oxide, carbon black, iron powder, PEG400: 3 parts; and tackifying resin Eastman Piccotac 9095 were put into a 600L kneader and kneaded at a temperature of 95-105℃ for 40 minutes. After stirring until uniform and free of particles, the mixture was cooled to below 80 degrees and tert-butylphenol resin FRJ-551 was added. The mixture was stirred evenly (about 5 minutes) and extruded into a turnover box. After cooling to a material temperature of 35 to 65℃, the mixture was fed into an extruder. The barrel temperature was 65 to 75℃. The mixture was extruded onto the first layer of release paper (adhesive thickness 2.9mm) and then onto the third layer of O-state aluminum plate (thickness 0.1mm). After cutting, a damping film with dimensions of 3mm*300mm*300mm was obtained.

[0066] Example 3

[0067] This embodiment provides a high-density flame-retardant damping film, which includes, from top to bottom, an isolation layer, a high-density butyl damping layer, and a confinement layer.

[0068] The butyl rubber compound in the high-density butyl damping layer contains the following components in the indicated weight proportions:

[0069] Xinhui Butyl Chloride 1301 (Mounney Viscosity 40): 3.5 parts;

[0070] Dahlin PB1300 (molecular weight Mw 1300 Dalton): 6.7 parts;

[0071] 50# white oil: 2.5 parts;

[0072] Industrial grade stearic acid (acid value 207 mg KOH / g): 0.5 parts;

[0073] Indirect zinc oxide: 0.5 parts;

[0074] Carbon black 112 (oil absorption value 70, blackness 38): 1 part;

[0075] Iron powder, 800 mesh: 50 parts;

[0076] Corn starch (hydroxyl content 36%): 3 parts;

[0077] Precipitated barium sulfate (1250 mesh): 30 parts;

[0078] Eastman Piccotac 9095 (softening point 96°C): 2 parts;

[0079] Tert-butylphenol resin FRJ-551 (softening point 105℃, hydroxymethyl content 13%): 0.3 parts.

[0080] The above-mentioned Xinhui chlorobutyl 1301, liquid polyisobutylene Dalin PB1300, mineral oil (white oil), stearic acid, zinc oxide, carbon black, iron powder, corn starch, precipitated barium sulfate, and Eastman Piccotac 9095 tackifying resin were put into a 600L kneader and kneaded at a temperature of 95-105℃ for 40-50 minutes. After stirring until uniform and free of particles, the mixture was cooled to below 80 degrees and tert-butylphenol resin FRJ-551 was added. The mixture was stirred evenly (about 5 minutes) and extruded into a turnover box. After cooling to a material temperature of 35-65℃, the mixture was fed into an extruder. The barrel temperature was 65-75℃. The mixture was extruded onto the first layer of release paper (2.9mm thick) and then onto the third layer of O-state aluminum plate (0.1mm thick). After cutting, a damping film with dimensions of 3mm*300mm*300mm was obtained.

[0081] Comparative Example 1

[0082] This comparative example provides a high-density flame-retardant damping film, which, from top to bottom, includes an isolation layer, a high-density butyl damping layer, and a confinement layer.

[0083] The butyl rubber compound in the high-density butyl damping layer contains the following components in the indicated weight proportions:

[0084] Yanshan Petrochemical 1751 (Mounney viscosity 51): 3.5 parts;

[0085] Dahlin PB1300 (molecular weight Mw 1300 Dalton): 6.7 parts;

[0086] 50# white oil: 2.5 parts;

[0087] Industrial grade stearic acid (acid value 207 mg KOH / g): 0.5 parts;

[0088] Indirect zinc oxide: 0.5 parts;

[0089] Carbon black 112 (oil absorption value 70, blackness 38): 1 part;

[0090] Iron powder, 800 mesh: 80 parts;

[0091] Precipitated barium sulfate (1250 mesh): 3 parts;

[0092] Eastman Piccotac 9095 (softening point 96°C): 2 parts;

[0093] Tert-butylphenol resin FRJ-551 (softening point 105℃, hydroxymethyl content 13%): 0.3 parts.

[0094] Comparative Example 1 uses 3 parts of precipitated barium sulfate (1250 mesh) instead of 3 parts of starch, otherwise it is the same as Example 1.

[0095] Comparative Example 2

[0096] This comparative example provides a high-density flame-retardant damping film, which, from top to bottom, includes an isolation layer, a high-density butyl damping layer, and a confinement layer.

[0097] The butyl rubber compound in the high-density butyl damping layer contains the following components in the indicated weight proportions:

[0098] Yanshan Petrochemical 1751 (Mounney viscosity 51): 3.5 parts;

[0099] Dahlin PB1300 (molecular weight Mw 1300 Dalton): 6.7 parts;

[0100] 50# white oil: 2.5 parts;

[0101] Industrial grade stearic acid (acid value 207 mg KOH / g): 0.5 parts;

[0102] Indirect zinc oxide: 0.5 parts;

[0103] Carbon black 112 (oil absorption value 70, blackness 38): 1 part;

[0104] Precipitated barium sulfate, 1250 mesh: 80 parts;

[0105] Corn starch (hydroxyl content 36%): 3 parts;

[0106] Eastman Piccotac 9095 (softening point 96°C): 2 parts;

[0107] Tert-butylphenol resin FRJ-551 (softening point 105℃, hydroxymethyl content 13%): 0.3 parts.

[0108] Comparative Example 2 uses 1250 mesh precipitated barium sulfate instead of 800 mesh iron powder, and the rest is the same as in Example 1.

[0109] Comparative Example 3

[0110] This comparative example provides a high-density flame-retardant damping film, which, from top to bottom, includes an isolation layer, a high-density butyl damping layer, and a confinement layer.

[0111] The butyl rubber compound in the high-density butyl damping layer contains the following components in the indicated weight proportions:

[0112] Yanshan Petrochemical 1751 (Mounney viscosity 51): 3.5 parts;

[0113] Dahlin PB1300 (molecular weight Mw 1300 Dalton): 6.7 parts;

[0114] 50# white oil: 2.5 parts;

[0115] Industrial grade stearic acid (acid value 207 mg KOH / g): 0.5 parts;

[0116] Indirect zinc oxide: 0.5 parts;

[0117] Carbon black 112 (oil absorption value 70, blackness 38): 1 part;

[0118] Iron powder, 800 mesh: 33 parts;

[0119] Corn starch (hydroxyl content 36%): 50 parts;

[0120] Eastman Piccotac 9095 (softening point 96°C): 2.3 parts.

[0121] Comparative Example 3 differs in the weight of iron powder and corn starch and does not contain vulcanized resin; otherwise, it is the same as Example 1.

[0122] Comparative Example 4

[0123] This comparative example provides a high-density flame-retardant damping film, which, from top to bottom, includes an isolation layer, a high-density butyl damping layer, and a confinement layer.

[0124] The butyl rubber compound in the high-density butyl damping layer contains the following components in the indicated weight proportions:

[0125] Yanshan Petrochemical 1751 (Mounney viscosity 51): 3.5 parts;

[0126] Dahlin PB1300 (molecular weight Mw 1300 Dalton): 6.7 parts;

[0127] 50# white oil: 2.5 parts;

[0128] Industrial grade stearic acid (acid value 207 mg KOH / g): 0.5 parts;

[0129] Indirect zinc oxide: 0.5 parts;

[0130] Carbon black 112 (oil absorption value 70, blackness 38): 1 part;

[0131] Iron powder, 800 mesh: 83 parts;

[0132] Eastman Piccotac 9095 (softening point 96°C): 2 parts;

[0133] Tert-butylphenol resin FRJ-551 (softening point 105℃, hydroxymethyl content 13%): 0.3 parts.

[0134] The difference from Example 1 is that the corn starch is replaced with an equal amount of 800 mesh iron powder, i.e., 803 parts of 800 mesh iron powder. Otherwise, it is the same as Example 1.

[0135] The testing method used for the damping film obtained above is as follows:

[0136] Sizes: Vernier calipers and measuring tape;

[0137] Appearance: Visually inspect the uniformity of the adhesive and whether the aluminum foil has any wrinkles;

[0138] Density: GB / T 533-2008 Determination of density of vulcanized rubber or thermoplastic rubber;

[0139] Material damping factor: GB / T 18258—2000: Damping materials—Test methods for damping performance;

[0140] Combustion performance: GB 8410-2006 Combustion characteristics of automotive interior materials;

[0141] ELV: GB / T 26125-2011: Determination of six restricted substances (lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls and polybrominated diphenyl ethers) in electronic and electrical products;

[0142] Odor: VDA 270-1992: Testing of odor properties of automotive interior materials;

[0143] Formaldehyde: VDA 275-1994: Determination of formaldehyde release from automotive interior materials by flask method;

[0144] Radar gain test:

[0145] a. Radar installation requirements: Attach the radar to the designated vehicle door and leave it for 24 hours for testing; there are 2 radars, each with a 300mm*300mm damping plate attached underneath, and the radar is positioned at the center of the damping plate.

[0146] b. Damping plate installation requirements: Attach the damping plate to the designated customer's car door, according to 2kg / cm². 2 The standard method uses rollers to apply pressure and places the sample for 24 hours before conducting the experiment.

[0147] c. Testing tools: Lay a standard mesh cloth on the ground. The mesh cloth should be 100*100mm in size and aligned with the radar and vehicle body mounting surfaces. Use a ф75*1000mm round rod for testing.

[0148] e. Test Procedure: Start by heating from room temperature to 85°C, then begin cooling to -30°C and maintain this temperature for 1 hour before performing radar horizontal FOV calibration. Repeat the same radar horizontal FOV calibration process, heating to 20°C and then to 85°C.

[0149] The results of the comparative and implementation key performance tests are shown in Tables 1 and 2.

[0150] Table 1. Performance Comparison of Examples

[0151]

[0152]

[0153] Table 2. Performance Comparison of Comparative Examples

[0154]

[0155] *When m=35g and H=0.09%, the detection limit for formaldehyde by method is 0.20mg / kg.

[0156] Table 2 clearly shows that in Comparative Examples 1 and 4, the presence of only iron powder (high-frequency vibration absorber A) without starch (high-frequency vibration absorber B) fails to effectively suppress noise generated by high-frequency vibrations at a low temperature of -30°C. In Comparative Example 2, high-density barium sulfate was used to replace iron powder, and in Comparative Example 3, the low iron powder content and high starch content resulted in a density reduction to 1.6, also leading to an inability to effectively suppress noise generated by high-frequency vibrations. However, Examples 1, 2, and 3, which contain both high-frequency vibration absorber A and high-frequency vibration absorber B, effectively suppress noise generation within the temperature range of -30°C to 85°C.

[0157] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various modifications or variations within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A high-density flame-retardant damping film, characterized in that, The high-density flame-retardant damping film comprises, in sequence, an isolation layer, a high-density butyl damping layer, and a confinement layer; the high-density butyl damping layer is made of butyl or halogenated butyl rubber, a high-frequency vibration absorber, and a high-density filler. The high-density butyl damping layer comprises the following components in parts by mass: 3-10 parts of butyl or halogenated butyl rubber; 6-10 parts of liquid polyisobutylene; 2-5 parts mineral oil; Stearic acid 0.5-1 part; Zinc oxide 0.5-2 parts; 1-2 parts pigment; 75-85 parts of high-frequency vibration absorber A; High-frequency vibration absorber B2-5 parts; 0-85 parts of high-density filler; 2-5 parts of tackifying resin; 0.2-1 part of vulcanized resin; The high-frequency vibration absorber A is iron powder with a mesh size of 800 or higher; The high-frequency vibration absorber B is corn starch; The high-density filler is precipitated barium sulfate or natural barium sulfate with a mesh size of 1250 or higher.

2. The high-density flame-retardant damping film according to claim 1, characterized in that, The release layer is a release film or release paper; the thickness of the release layer is 0.05-0.2 mm.

3. The high-density flame-retardant damping film according to claim 1, characterized in that, The density of the high-density butyl damping layer is 2.0-3.5 g / cm³. 3 The thickness of the high-density butyl damping layer is 1.0-5.0 mm.

4. The high-density flame-retardant damping film according to claim 1, characterized in that, The limiting layer comprises one of fiberglass cloth, H-state aluminum plate, and O-state aluminum plate; the thickness of the limiting layer is 0.05-0.7mm.

5. The high-density flame-retardant damping film according to claim 1, characterized in that, The butyl or halogenated butyl rubber has a Mooney viscosity of 40-70, including one or more of Yanshan Petrochemical 1751, Russian 1675N, JSR 268, Exxsonmobile 2255, LanXess X-butyl BB X2, and Xinhui chlorinated butyl rubber 1301.

6. A method for preparing a high-density flame-retardant damping film as described in claim 1, characterized in that, The preparation method includes the following steps: S1. Knead butyl or halogenated butyl rubber, liquid polyisobutylene, mineral oil, stearic acid, zinc oxide, pigment, high-frequency vibration absorber A, high-frequency vibration absorber B, high-density filler, and tackifying resin until uniform and free of particles. After cooling, add vulcanizing resin, stir evenly, and extrude to obtain high-density butyl damping layer slurry. S2. After cooling the slurry obtained in step S1, feed it into an extruder and extrude it onto the first isolation layer. Then, it is laminated with the third limiting layer. After cutting, the high-density flame-retardant damping film is obtained.

7. The application of the high-density flame-retardant damping film as described in claim 1 in the preparation of patches for suppressing high-frequency vibrations.

Images