CN118272007A - Halogen-free flame-retardant high-density damping sheet and preparation method thereof - Google Patents
Halogen-free flame-retardant high-density damping sheet and preparation method thereof Download PDFInfo
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- 238000013016 damping Methods 0.000 title claims abstract description 59
- 239000003063 flame retardant Substances 0.000 title claims abstract description 46
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 48
- 229920002367 Polyisobutene Polymers 0.000 claims abstract description 27
- 239000007788 liquid Substances 0.000 claims abstract description 27
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229920005549 butyl rubber Polymers 0.000 claims abstract description 24
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims abstract description 23
- ZQKXQUJXLSSJCH-UHFFFAOYSA-N melamine cyanurate Chemical compound NC1=NC(N)=NC(N)=N1.O=C1NC(=O)NC(=O)N1 ZQKXQUJXLSSJCH-UHFFFAOYSA-N 0.000 claims abstract description 22
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 21
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000007822 coupling agent Substances 0.000 claims abstract description 21
- 239000000843 powder Substances 0.000 claims abstract description 21
- 239000011787 zinc oxide Substances 0.000 claims abstract description 13
- 238000004513 sizing Methods 0.000 claims description 35
- 238000013329 compounding Methods 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- 239000011888 foil Substances 0.000 claims description 6
- 230000035807 sensation Effects 0.000 claims description 4
- 239000004744 fabric Substances 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 2
- DXZMANYCMVCPIM-UHFFFAOYSA-L zinc;diethylphosphinate Chemical compound [Zn+2].CCP([O-])(=O)CC.CCP([O-])(=O)CC DXZMANYCMVCPIM-UHFFFAOYSA-L 0.000 claims 2
- 230000002195 synergetic effect Effects 0.000 abstract description 7
- 239000000047 product Substances 0.000 description 28
- 230000000694 effects Effects 0.000 description 10
- 229920001971 elastomer Polymers 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 239000000945 filler Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000005284 excitation Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 229910021389 graphene Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000007719 peel strength test Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Abstract
The invention discloses a halogen-free flame-retardant high-density damping sheet and a preparation method thereof, wherein the halogen-free flame-retardant high-density damping sheet comprises the following components in percentage by mass: 5 to 10 percent of butyl rubber, 5 to 10 percent of liquid polyisobutene, 25 to 50 percent of aluminum hydroxide, 25 to 50 percent of reduced iron powder, 10 to 20 percent of melamine cyanurate, 0.5 to 3.0 percent of zinc oxide and 0.5 to 2.0 percent of titanate coupling agent. Compared with the prior art, the invention has the advantages that: compared with the prior art, the density of the prepared product is higher than 2.6g/cm 3 and up to 3.3g/cm 3 through reasonable proportioning and synergistic effect of different materials, and the product has excellent high-frequency damping performance, excellent flame retardance and excellent cohesiveness.
Description
Technical Field
The invention relates to a damping material and a preparation process thereof, in particular to a halogen-free flame-retardant high-density damping sheet and a preparation method thereof.
Background
At present, vibration and noise pollution are more and more focused, and the damping material can convert mechanical vibration energy or acoustic energy into heat energy or other forms of energy to be dissipated, so that the damping material is widely applied to the fields of automobiles, buildings, mechanical equipment and the like.
For damping shock absorption products, the damping device has excellent damping performance, and is high in damping coefficient, wide in damping temperature range and wide in damping frequency range. The former two are generally easier to achieve by increasing product thickness or adjusting formulation, but third parties currently have no better solution. Particularly, recently, along with the fire explosion of the new energy automobile market, the problem of high-frequency vibration caused by a high-frequency motor is still troublesome. In addition to damping properties, the product should also possess excellent adhesion properties and flame retardant properties. The adhesive property ensures good adhesion of the product and can not fall off under extreme conditions; and the flame retardant property ensures that the product cannot be easily burnt to generate safety accidents.
The invention discloses a Chinese patent with a patent publication number of CN108276688 and a patent name of 'a graphene flame-retardant constraint damping sheet for a vehicle' and a preparation method thereof, wherein the graphene microchip and a phosphorus flame retardant are utilized to perform synergistic flame retardant effect to prepare the flame-retardant constraint damping sheet for the vehicle. The self-adhesive flame-retardant butyl rubber damping material is prepared by adjusting the proportions of butyl rubber, tackifying resin, bonding auxiliary agent and compound flame retardant in Chinese patent publication No. CN107446248B and the patent name of the self-adhesive flame-retardant butyl rubber damping material and the preparation method thereof. However, these products have low density and poor high frequency damping properties, which limit their use.
Therefore, developing a halogen-free flame-retardant high-density damping sheet and a preparation method thereof become a problem to be solved urgently by those skilled in the art.
Disclosure of Invention
The invention provides a halogen-free flame-retardant high-density damping sheet and a preparation method thereof for solving the defects.
The above object of the present invention is achieved by the following technical solutions: the halogen-free flame-retardant high-density damping sheet comprises the following components in percentage by mass: 5 to 10 percent of butyl rubber, 5 to 10 percent of liquid polyisobutene, 25 to 50 percent of aluminum hydroxide, 25 to 50 percent of reduced iron powder, 10 to 20 percent of melamine cyanurate, 0.5 to 3.0 percent of zinc oxide and 0.5 to 2.0 percent of titanate coupling agent.
Butyl rubber, a main rubber material, plays a damping role and has a molecular weight of 5-80 ten thousand; the consumption is 5% -10%, if the content is too low, the product is difficult to be molded, the damping effect is poor, and if the content is too high, the density is too low.
Liquid polyisobutene plays a role in tackifying and has a molecular weight of 400-10000; the consumption is 5% -10%, if the content is too low, the product viscosity is too low, the damping effect is poor, if the content is too high, the product hardness is too low, the product is easy to deform, and the density is too low.
Aluminum hydroxide and melamine cyanurate are used for flame retardance in a synergistic way, and meanwhile, the density of a product can be increased, and the mesh number is 40-3000; the consumption is 25% -50%, if the content is too low, the flame retardant effect is poor, and meanwhile, the density is too low, so that the high-frequency damping effect is poor; if the content is too high, the tackiness will be reduced, and the product will not adhere to the product.
Reduced iron powder with 40-3000 mesh number and with the functions of increasing density and strengthening cohesion; the consumption is 25% -50%, if the content is too low, the density of the product is too low, the high-frequency damping effect is poor, if the content is too high, the viscosity is reduced, and the product cannot be adhered for use.
Melamine cyanurate and aluminum hydroxide are used for flame retardance in a synergic manner; the content of 10-20% is too low, the flame retardant effect is poor, the viscosity is reduced if the content is too high, and the product cannot be adhered for use.
Zinc oxide and a rubber cross-linking agent can improve the cohesion of the material; the dosage is 0.5 to 3.0 percent, and if the content is too low, the cohesion of the material is insufficient, and the material is easy to deform and flow, especially under the high temperature condition; if the content is too high, the crosslinking degree is too high, which reduces the tackiness of the product, resulting in the problem of non-adhesion.
The titanate coupling agent can increase the compatibility between rubber and filler, can increase the content of the filler in the rubber, and obviously improves the appearance and the processing performance of the product; the dosage is 0.5 to 2.0 percent, and if the content is too low, the compatibilization effect is insufficient; if the content is too high, the effect is not remarkable and the cost is increased.
Preferably, the halogen-free flame-retardant high-density damping sheet comprises the following components in percentage by mass: 6-8% of butyl rubber, 6-8% of liquid polyisobutene, 30-45% of aluminum hydroxide, 28-40% of reduced iron powder, 15-20% of melamine cyanurate, 0.5-2.0% of zinc oxide and 0.5-1.0% of titanate coupling agent.
Preferably, the halogen-free flame-retardant high-density damping sheet comprises the following components in percentage by mass: 6% of butyl rubber, 7% of liquid polyisobutene, 36% of aluminum hydroxide, 30% of reduced iron powder, 20% of melamine cyanurate, 0.5% of zinc oxide and 0.5% of titanate coupling agent.
Increasing the filler and flame retardant content significantly increases the product density, but at the same time reduces the material viscosity, making the product prone to falling off in certain extreme cases. According to the invention, through reasonable design and synergistic effect of the proportion of rubber (butyl rubber), filler (aluminum hydroxide and reduced iron powder) and flame retardant (aluminum hydroxide and melamine cyanurate) and the compatibilization effect of the titanate coupling agent, the final product not only ensures high density (> 2.6g/cm 3) but also has excellent peel strength (> 35N/25 mm), and simultaneously has excellent flame retardant performance (in accordance with UL 94V 0 flame retardant test standard).
A preparation method of a halogen-free flame-retardant high-density damping sheet comprises the following steps:
S1: adding butyl rubber, semi-liquid polyisobutene, aluminum hydroxide and titanate coupling agent into an open mill for mixing at 40-80 ℃ at 20-40 rpm until the sizing material is smooth and has no obvious granular sensation;
s2: adding the rest half liquid polyisobutene, reduced iron powder and melamine cyanurate into an open mill, continuously mixing with the sizing material obtained in the step S1, wherein the temperature is 40-80 ℃ and the rotating speed is 20-40 rpm until the sizing material is smooth and has no obvious granular sensation;
s3: putting the uniformly mixed sizing material into an extruder, extruding the sizing material into a continuous sheet at the temperature of 60-120 ℃, compounding aluminum foil or glass fiber cloth on the upper layer of the sheet, and attaching release paper on the lower layer of the sheet;
S4: and cutting the continuous sheet into a target size to obtain the halogen-free flame-retardant high-density damping sheet.
Compared with the prior art, the invention has the advantages that: compared with the prior art (density is 1.5-2.2g/cm 3), the density of the prepared product is higher than 2.6g/cm 3 and can reach 3.3g/cm 3 through reasonable proportioning and synergistic effect of different materials, and the product has excellent high-frequency damping performance, excellent flame retardance and excellent cohesiveness.
Detailed Description
The invention is further described in detail below with reference to examples.
Example 1: the halogen-free flame-retardant high-density damping sheet comprises the following raw materials in percentage by mass: 6% of butyl rubber, 7% of liquid polyisobutene, 36% of aluminum hydroxide, 30% of reduced iron powder, 20% of melamine cyanurate, 0.5% of zinc oxide and 0.5% of titanate coupling agent. The preparation method of the halogen-free flame-retardant high-density damping sheet comprises the following steps:
s1: butyl rubber, semi-liquid polyisobutene, aluminum hydroxide and titanate coupling agent are put into an open mill for mixing at the temperature of 65 ℃ and the rotating speed of 20 rpm until the sizing material is smooth and has no obvious granular feel;
S2: adding the rest half of liquid polyisobutene, reduced iron powder and melamine cyanurate into an open mill, continuously mixing with the sizing material obtained in the step S1, wherein the temperature is 75 ℃, and the rotating speed is 25 rpm until the sizing material is smooth and has no obvious granular feel;
s3: putting the uniformly mixed sizing material into an extruder, extruding the sizing material into a continuous sheet at the temperature of 85 ℃, compounding aluminum foil with the thickness of 0.1mm on the upper layer of the sheet, attaching release paper on the lower layer of the sheet, and enabling the total thickness of the product to be 2.0mm (not counted as the thickness of the release paper);
s4: the continuous sheet is cut to a target size.
Example 2: the halogen-free flame-retardant high-density damping sheet comprises the following raw materials in percentage by mass: butyl rubber 5%, liquid polyisobutylene 10%, aluminum hydroxide 25%, reduced iron powder 47%, melamine cyanurate 10%, zinc oxide 2.5% and titanate coupling agent 0.5%. The preparation method of the halogen-free flame-retardant high-density damping sheet comprises the following steps:
s1: butyl rubber, semi-liquid polyisobutene, aluminum hydroxide and titanate coupling agent are put into an open mill for mixing, the temperature is 80 ℃, the rotating speed is 40 rpm, and the sizing material is smooth and has no obvious granular feel;
S2: adding the rest half liquid polyisobutene, reduced iron powder and melamine cyanurate into an open mill, continuously mixing with the sizing material obtained in the step S1, wherein the temperature is 50 ℃, and the rotating speed is 30rpm until the sizing material is smooth and has no obvious granular feel;
s3: putting the uniformly mixed sizing material into an extruder, extruding the sizing material into a continuous sheet at the temperature of 60 ℃, compounding glass fiber cloth with the thickness of 0.1mm on the upper layer of the sheet, attaching release paper on the lower layer of the sheet, and enabling the total thickness of the product to be 2.0mm (the thickness of the release paper is not counted);
s4: the continuous sheet is cut to a target size.
Example 3: the halogen-free flame-retardant high-density damping sheet comprises the following raw materials in percentage by mass: 10% of butyl rubber, 5% of liquid polyisobutene, 42% of aluminum hydroxide, 25% of reduced iron powder, 15% of melamine cyanurate, 1% of zinc oxide and 2% of titanate coupling agent. The preparation method of the halogen-free flame-retardant high-density damping sheet comprises the following steps:
S1: butyl rubber, semi-liquid polyisobutene, aluminum hydroxide and titanate coupling agent are put into an open mill for mixing at the temperature of 40 ℃ and the rotating speed of 20 rpm until the sizing material is smooth and has no obvious granular feel;
S2: adding the rest half liquid polyisobutene, reduced iron powder and melamine cyanurate into an open mill, and continuously mixing with the sizing material obtained in the step S1 at the temperature of 40 ℃ and the rotating speed of 40rpm until the sizing material is smooth and has no obvious granular feel;
S3: putting the uniformly mixed sizing material into an extruder, extruding the sizing material into a continuous sheet at the temperature of 120 ℃, compounding an aluminum foil of 0.1mm on the upper layer of the sheet, attaching release paper on the lower layer of the sheet, and enabling the total thickness of the product to be 2.0mm (not counting the thickness of the release paper);
s4: the continuous sheet is cut to a target size.
Example 4: the halogen-free flame-retardant high-density damping sheet comprises the following raw materials in percentage by mass: 7% of butyl rubber, 8% of liquid polyisobutene, 29% of aluminum hydroxide, 40% of reduced iron powder, 12% of melamine cyanurate, 2.5% of zinc oxide and 1.5% of titanate coupling agent. The preparation method of the halogen-free flame-retardant high-density damping sheet comprises the following steps:
s1: butyl rubber, semi-liquid polyisobutene, aluminum hydroxide and titanate coupling agent are put into an open mill for mixing at the temperature of 65 ℃ and the rotating speed of 20 rpm until the sizing material is smooth and has no obvious granular feel;
S2: adding the rest half of liquid polyisobutene, reduced iron powder and melamine cyanurate into an open mill, continuously mixing with the sizing material obtained in the step S1, wherein the temperature is 75 ℃, and the rotating speed is 25 rpm until the sizing material is smooth and has no obvious granular feel;
s3: putting the uniformly mixed sizing material into an extruder, extruding the sizing material into a continuous sheet at the temperature of 85 ℃, compounding aluminum foil with the thickness of 0.1mm on the upper layer of the sheet, attaching release paper on the lower layer of the sheet, and enabling the total thickness of the product to be 2.0mm (not counted as the thickness of the release paper);
s4: the continuous sheet is cut to a target size.
Example 5: the halogen-free flame-retardant high-density damping sheet comprises the following raw materials in percentage by mass: butyl rubber 5%, liquid polyisobutylene 5%, aluminum hydroxide 28%, reduced iron powder 45%, melamine cyanurate 15%, zinc oxide 0.5% and titanate coupling agent 1.5%. The preparation method of the halogen-free flame-retardant high-density damping sheet comprises the following steps:
s1: butyl rubber, semi-liquid polyisobutene, aluminum hydroxide and titanate coupling agent are put into an open mill for mixing at the temperature of 65 ℃ and the rotating speed of 20 rpm until the sizing material is smooth and has no obvious granular feel;
S2: adding the rest half of liquid polyisobutene, reduced iron powder and melamine cyanurate into an open mill, continuously mixing with the sizing material obtained in the step S1, wherein the temperature is 75 ℃, and the rotating speed is 25 rpm until the sizing material is smooth and has no obvious granular feel;
s3: putting the uniformly mixed sizing material into an extruder, extruding the sizing material into a continuous sheet at the temperature of 85 ℃, compounding aluminum foil with the thickness of 0.1mm on the upper layer of the sheet, attaching release paper on the lower layer of the sheet, and enabling the total thickness of the product to be 2.0mm (not counted as the thickness of the release paper);
s4: the continuous sheet is cut to a target size.
Performance testing of various embodiments of the invention:
(1) High-frequency damping performance test:
Samples were tested for high frequency damping performance on a VBT-Obest shock Liang Zhuaipan test system according to ASTM E756. The total thickness of the sample was 2.0mm, the width was 12.5mm and the length was 215mm. Specifically, the cut-out size sample was peeled off of the release paper and attached to a steel bar having a thickness of 1.0mm, a width of 12.5mm and a length of 241 mm. The steel bar to be tested, to which the specimen is attached, is clamped vertically at one end and vibrated at an excitation frequency of 1-1000HZ by a non-contact electromagnetic exciter located near the free end. Responses of the bars to various frequency excitations are measured by suitably positioned sensors and the vibration amplitude of the test bars is detected. Damping performance is expressed by loss factor, and is considered to meet application requirements when the loss factor of the sample at 1000HZ high frequency excitation is not less than 0.1.
(2) Flame retardant performance test:
The vertical burn rating was tested using a vertical burn equipment according to ANSI/UL 94-2021, with spline dimensions of 125mm by 13mm by 2mm.
(3) Peel strength test:
according to GB/T2790, a peel force test was performed on a 25mm wide sample attached to a steel plate using a tensile machine at a tensile speed of 100mm/min.
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | |
| Density (g/cm 3) | 2.92 | 2.76 | 2.65 | 2.83 | 3.25 |
| High-frequency damping coefficient of 1000HZ | 0.12 | 0.11 | 0.11 | 0.12 | 0.14 |
| UL94 flame retardant rating | V-0 | V-0 | V-0 | V-0 | V-0 |
| Peel strength (N/25 mm) | 38.9 | 41.3 | 44.9 | 40.4 | 36.6 |
Compared with the prior art (density 1.5-2.2g/cm 3), the damping sheet prepared by the formula and the process has the advantages that the density of the prepared product is higher than 2.6g/cm 3 and can reach 3.3g/cm 3 at most through reasonable proportioning and synergistic effect of different materials, and the damping sheet has excellent high-frequency damping performance, excellent flame retardance and excellent cohesiveness.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related arts are included in the scope of the present invention.
Claims (4)
1. A halogen-free flame-retardant high-density damping fin is characterized in that: the damping sheet comprises the following components in percentage by mass: 5 to 10 percent of butyl rubber, 5 to 10 percent of liquid polyisobutene, 25 to 50 percent of aluminum hydroxide, 25 to 50 percent of reduced iron powder, 10 to 20 percent of melamine cyanurate, 0.5 to 3.0 percent of zinc oxide and 0.5 to 2.0 percent of titanate coupling agent.
2. The halogen-free flame retardant high density damping fin as claimed in claim 1, wherein: the halogen-free flame-retardant high-density damping sheet comprises the following components in percentage by mass: 6-8% of butyl rubber, 6-8% of liquid polyisobutene, 30-45% of aluminum hydroxide, 28-40% of reduced iron powder, 15-20% of melamine cyanurate, 0.5-2.0% of zinc oxide and 0.5-1.0% of titanate coupling agent.
3. The halogen-free flame retardant high density damping fin as claimed in claim 1, wherein: the halogen-free flame-retardant high-density damping sheet comprises the following components in percentage by mass: 6% of butyl rubber, 7% of liquid polyisobutene, 36% of aluminum hydroxide, 30% of reduced iron powder, 20% of melamine cyanurate, 0.5% of zinc oxide and 0.5% of titanate coupling agent.
4. A preparation method of a halogen-free flame-retardant high-density damping sheet comprises the following steps:
S1: adding butyl rubber, semi-liquid polyisobutene, aluminum hydroxide and titanate coupling agent into an open mill for mixing at 40-80 ℃ at 20-40 rpm until the sizing material is smooth and has no obvious granular sensation;
s2: adding the rest half liquid polyisobutene, reduced iron powder and melamine cyanurate into an open mill, continuously mixing with the sizing material obtained in the step S1, wherein the temperature is 40-80 ℃ and the rotating speed is 20-40 rpm until the sizing material is smooth and has no obvious granular sensation;
s3: putting the uniformly mixed sizing material into an extruder, extruding the sizing material into a continuous sheet at the temperature of 60-120 ℃, compounding aluminum foil or glass fiber cloth on the upper layer of the sheet, and attaching release paper on the lower layer of the sheet;
S4: and cutting the continuous sheet into a target size to obtain the halogen-free flame-retardant high-density damping sheet.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118272007A true CN118272007A (en) | 2024-07-02 |
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