CN110922688A - Manufacturing method of flame-retardant damping cushion for automobile - Google Patents
Manufacturing method of flame-retardant damping cushion for automobile Download PDFInfo
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- CN110922688A CN110922688A CN201911264145.1A CN201911264145A CN110922688A CN 110922688 A CN110922688 A CN 110922688A CN 201911264145 A CN201911264145 A CN 201911264145A CN 110922688 A CN110922688 A CN 110922688A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/16—Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/14—Copolymers of propene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/003—Additives being defined by their diameter
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
Abstract
The invention relates to a method for manufacturing a flame-retardant damping pad for an automobile, which comprises the following steps of (by weight ratio of PP, EPDM, barite powder, aluminum hydroxide and an antioxidant) in the following steps: (5-15): (45-55): (20-30): (0.1-0.5) mixing; putting the weighed raw materials into an internal mixer for high-speed kneading; feeding the mixed material into a single-screw extruder, passing through a die head, and pressing into a sheet with required thickness; and (4) setting the cutting size according to requirements, and cutting the formed sheet to obtain the flame-retardant damping pad for the automobile. Compared with the prior art, the invention can improve the high temperature resistance and has good flame retardant effect by selecting proper raw materials and proportion.
Description
Technical Field
The invention relates to the technical field of manufacturing of automobile damping cushions, in particular to a manufacturing method of an automobile flame-retardant damping cushion.
Background
The damping pad is formed by blending thermoplastic/rubber, inorganic filler and various auxiliaries, is mainly used for automotive interior parts (inner front wall, inner wheel cover and the like), and mainly has the functions of sound insulation and heat insulation. The temperature in the engine compartment is high, the safety requirement on flame retardance is also high, and the safety requirement is high due to the inflammability and the installation position of the material. At present, a few enterprises can produce the material parts, and the materials are basically produced according to the flame retardant standard of GB8410 or TL1010 and generally show the safety performance of automobiles.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a method for manufacturing a flame-retardant damping pad for an automobile, and solves the technical problems of poor high temperature resistance and flame-retardant effect comprehensive performance of the damping pad in the prior art.
The purpose of the invention can be realized by the following technical scheme:
a manufacturing method of an automotive flame-retardant damping cushion comprises the following steps:
(1) preparing materials: PP, EPDM, barite powder, aluminum hydroxide and an antioxidant in a weight ratio of (5-15): (5-15): (45-55): (20-30): (0.1-0.5) mixing;
(2) mixing: putting the weighed raw materials into an internal mixer for high-speed kneading;
(3) extruding into sheets: feeding the mixed material into a single-screw extruder, passing through a die head, and pressing into a sheet with required thickness;
(4) cutting: and (4) setting the cutting size according to requirements, and cutting the formed sheet to obtain the flame-retardant damping pad for the automobile.
The PP is copolymerized PP, the melting point is high, the thermal deformation temperature is high, the melt index is 1.9-3.6 g/10min (230 ℃/2.16kg), the tensile modulus is more than 20MPa, and the bending modulus is more than 700 MPa.
The EPDM is ENB type ethylene propylene diene monomer, the Mooney viscosity is 16-24(ML1+4, 125 ℃), and the ethylene content is 67.5-71.5 wt%.
The barium sulfate content in the barite powder is more than or equal to 92 percent, and the mesh number is 600 meshes.
The particle size (D50) of the aluminum hydroxide is 2.0-3.0 μm, the ignition loss is 34-35 w%, and the whiteness value is more than or equal to 93%.
The antioxidant is a mixture of the antioxidant 1010 and the antioxidant 168, and the mixing ratio is 3:2, so that the antioxidant capacity is improved.
According to a more preferable technical scheme, the PP, the EPDM, the barite powder, the aluminum hydroxide and the antioxidant are mixed according to the weight ratio of (5-10): (5-10): (50-55): (20-25): (0.1-0.5) mixing. By selecting proper raw materials and proportion, on one hand, the high temperature resistance can be improved, and on the other hand, the flame retardant effect is good.
By adopting the proportion, the integral melting point and the thermal deformation temperature of the product can be effectively improved, the consumption is too small, and the product has low melting point and cannot meet the requirement; the use amount is too much, and the performance requirements of the product such as hardness, stretching and the like are influenced. The selected aluminum hydroxide can prevent fuming during combustion, does not produce dripping objects and does not produce toxic gas. By adopting the proportion, if the dosage is too small, the flame retardant effect cannot be achieved; too much kneaded gum block is sticky, which affects production.
Exhausting in the middle of high-speed kneading, controlling the mixing time to be 15-20 minutes, and controlling the discharging temperature to be 180-190 ℃.
The screw temperature of the single-screw extruder is controlled to be 180-200 ℃, and the die head temperature is controlled to be 190-210 ℃.
Compared with the prior art, the technical scheme disclosed by the invention has the advantages that the proper raw materials and proportion are selected, so that the high-temperature resistance can be improved, the good flame-retardant effect is realized, and the following advantages are realized:
(1) the sound insulation pad product using the damping pad has better safety performance, flame with the height of 100mm directly contacts with a part, the part cannot be diffused during combustion, a fire source is removed after the part is combusted for 10 minutes, the flame on the part is self-extinguished after the part is combusted, and the part cannot be combusted continuously. After the combustion time is over, the extinguished part is blown by a blower without reignition.
(2) The sound insulation cushion product using the damping cushion can resist high temperature and can meet the requirement of 130 ℃, can be stored for 500 hours and can be used in the environment below 130 ℃.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
A manufacturing method of an automotive flame-retardant damping cushion comprises the following steps:
(1) preparing materials: PP, EPDM, barite powder, aluminum hydroxide and an antioxidant in a weight ratio of (5-15): (5-15): (45-55): (20-30): (0.1-0.5), wherein the used PP is copolymerized PP, the melting point is high, the heat distortion temperature is high, the melt index is 1.9-3.6 g/10min (230 ℃/2.16kg), the tensile modulus is more than 20MPa, the flexural modulus is more than 700MPa, EPDM is ENB type ethylene propylene diene monomer, the Mooney viscosity is 16-24(ML1+4, 125 ℃), the ethylene content is 67.5-71.5 wt%, the barium sulfate content in the barite powder is more than or equal to 92%, the mesh number is 600 meshes, the particle size of aluminum hydroxide (D50) is 2.0-3.0 mu m, the ignition loss is 34-35 w%, the whiteness value is more than or equal to 93%, and the antioxidant is a mixture of antioxidant 1010 and antioxidant 168 in a weight ratio of 3: 2;
(2) mixing: the weighed raw materials are put into an internal mixer for high-speed kneading, the air needs to be exhausted midway, the mixing time is controlled to be 15-20 minutes, and the discharging temperature is controlled to be 180-190 ℃;
(3) extruding into sheets: feeding the mixed material into a single-screw extruder, pressing the mixed material into a sheet with the required thickness through a die head, wherein the screw temperature of the single-screw extruder is controlled to be 180-200 ℃, and the die head temperature is controlled to be 190-210 ℃;
(4) cutting: and (4) setting the cutting size according to requirements, and cutting the formed sheet to obtain the flame-retardant damping pad for the automobile.
The following are more detailed embodiments, and the technical solutions and the technical effects obtained by the present invention will be further described by the following embodiments.
Example 1
A manufacturing method of an automotive flame-retardant damping cushion comprises the following steps:
(1) preparing materials: mixing PP, EPDM, barite powder, aluminum hydroxide and an antioxidant in a weight ratio of 5: 15: 55: 20: 0.1, mixing, wherein the used PP is copolymerized PP, the melting point is high, the heat distortion temperature is high, the melt index is 1.9g/10min (230 ℃/2.16kg), the tensile modulus is more than 20MPa, the bending modulus is more than 700MPa, the EPDM is ENB type ethylene propylene diene monomer, the Mooney viscosity is 18(ML1+4, 125 ℃), the ethylene content is 67.5 wt%, the barium sulfate content in the barite powder is more than or equal to 92%, the mesh number is 600 meshes, the particle size (D50) of the aluminum hydroxide is 2.0 mu m, the ignition loss is 34 w%, the whiteness value is more than or equal to 93%, and the antioxidant is a mixture of antioxidant 1010 and antioxidant 168 according to the weight ratio of 3: 2;
(2) mixing: the weighed raw materials are put into an internal mixer for high-speed kneading, the air needs to be exhausted midway, the mixing time is controlled to be 15 minutes, and the discharging temperature is controlled to be 180 ℃;
(3) extruding into sheets: feeding the mixed material into a single-screw extruder, pressing the mixed material into a sheet with the required thickness through a die head, wherein the screw temperature of the single-screw extruder is controlled at 180 ℃, and the die head temperature is controlled at 190 ℃;
(4) cutting: and (4) setting the cutting size according to requirements, and cutting the formed sheet to obtain the flame-retardant damping pad for the automobile.
Example 2
A manufacturing method of an automotive flame-retardant damping cushion comprises the following steps:
(1) preparing materials: mixing PP, EPDM, barite powder, aluminum hydroxide and an antioxidant in a weight ratio of 6: 10: 50: 25: 0.3, wherein the used PP is copolymerized PP, the melting point is high, the heat distortion temperature is high, the melt index is 2g/10min (230 ℃/2.16kg), the tensile modulus is more than 20MPa, the bending modulus is more than 700MPa, the EPDM is ENB type ethylene propylene diene monomer, the Mooney viscosity is 22(ML1+4, 125 ℃), the ethylene content is 68.5 wt%, the barium sulfate content in the barite powder is more than or equal to 92 percent, the mesh number is 600 meshes, the particle size (D50) of the aluminum hydroxide is 2.0 mu m, the ignition loss is 35w percent, the whiteness value is more than or equal to 93 percent, and the antioxidant is a mixture of antioxidant 1010 and antioxidant 168 according to the weight ratio of 3: 2;
(2) mixing: the weighed raw materials are put into an internal mixer for high-speed kneading, the air exhaust is needed in the midway, the mixing time is controlled to be 16 minutes, and the discharging temperature is controlled to be 190 ℃;
(3) extruding into sheets: feeding the mixed material into a single-screw extruder, pressing the mixed material into a sheet with the required thickness through a die head, wherein the screw temperature of the single-screw extruder is controlled at 190 ℃, and the die head temperature is controlled at 190 ℃;
(4) cutting: and (4) setting the cutting size according to requirements, and cutting the formed sheet to obtain the flame-retardant damping pad for the automobile.
Example 3
A manufacturing method of an automotive flame-retardant damping cushion comprises the following steps:
(1) preparing materials: mixing PP, EPDM, barite powder, aluminum hydroxide and an antioxidant in a weight ratio of 10: 10: 50: 24: 0.2, wherein the used PP is copolymerized PP, the melting point is high, the heat distortion temperature is high, the melt index is 2.6g/10min (230 ℃/2.16kg), the tensile modulus is more than 20MPa, the flexural modulus is more than 700MPa, the EPDM is ENB type ethylene propylene diene monomer, the Mooney viscosity is 16(ML1+4, 125 ℃), the ethylene content is 71.5 wt%, the barium sulfate content in the barite powder is more than or equal to 92%, the mesh number is 600 meshes, the particle size (D50) of the aluminum hydroxide is 3.0 mu m, the ignition loss is 34 w%, the whiteness value is more than or equal to 93%, and the antioxidant is a mixture of antioxidant 1010 and antioxidant 168 according to the weight ratio of 3: 2;
(2) mixing: the weighed raw materials are put into an internal mixer for high-speed kneading, the air exhaust is needed in the midway, the mixing time is controlled to be 20 minutes, and the discharging temperature is controlled to be 190 ℃;
(3) extruding into sheets: feeding the mixed material into a single-screw extruder, pressing the mixed material into a sheet with the required thickness through a die head, wherein the screw temperature of the single-screw extruder is controlled at 200 ℃, and the die head temperature is controlled at 210 ℃;
(4) cutting: and (4) setting the cutting size according to requirements, and cutting the formed sheet to obtain the flame-retardant damping pad for the automobile.
Example 4
A manufacturing method of an automotive flame-retardant damping cushion comprises the following steps:
(1) preparing materials: mixing PP, EPDM, barite powder, aluminum hydroxide and an antioxidant in a weight ratio of 15: 12: 55: 30: 0.5, wherein the used PP is copolymerized PP, the melting point is high, the heat distortion temperature is high, the melt index is 3.6g/10min (230 ℃/2.16kg), the tensile modulus is more than 20MPa, the flexural modulus is more than 700MPa, the EPDM is ENB type ethylene propylene diene monomer, the Mooney viscosity is 20(ML1+4, 125 ℃), the ethylene content is 71.5 wt%, the barium sulfate content in the barite powder is more than or equal to 92%, the mesh number is 600 meshes, the particle size (D50) of the aluminum hydroxide is 2.5 mu m, the ignition loss is 35 w%, the whiteness value is more than or equal to 93%, and the antioxidant is a mixture of antioxidant 1010 and antioxidant 168 according to the weight ratio of 3: 2;
(2) mixing: the weighed raw materials are put into an internal mixer for high-speed kneading, the air exhaust is needed in the midway, the mixing time is controlled to be 20 minutes, and the discharging temperature is controlled to be 185 ℃;
(3) extruding into sheets: feeding the mixed material into a single-screw extruder, pressing the mixed material into a sheet with the required thickness through a die head, wherein the screw temperature of the single-screw extruder is controlled at 200 ℃, and the die head temperature is controlled at 200 ℃;
(4) cutting: and (4) setting the cutting size according to requirements, and cutting the formed sheet to obtain the flame-retardant damping pad for the automobile.
Example 5
A manufacturing method of an automotive flame-retardant damping cushion comprises the following steps:
(1) preparing materials: mixing PP, EPDM, barite powder, aluminum hydroxide and an antioxidant in a weight ratio of 15: 10: 55: 30: 0.1, wherein the used PP is copolymerized PP, the melting point is high, the heat distortion temperature is high, the melt index is 3.6g/10min (230 ℃/2.16kg), the tensile modulus is more than 20MPa, the flexural modulus is more than 700MPa, the EPDM is ENB type ethylene propylene diene monomer, the Mooney viscosity is 24(ML1+4, 125 ℃), the ethylene content is 71.5 wt%, the barium sulfate content in the barite powder is more than or equal to 92%, the mesh number is 600 meshes, the particle size of aluminum hydroxide (D50) is 3.0 mu m, the ignition loss is 35 w%, the whiteness value is more than or equal to 93%, and the antioxidant is a mixture of antioxidant 1010 and antioxidant 168 in a weight ratio of 3: 2;
(2) mixing: the weighed raw materials are put into an internal mixer for high-speed kneading, the air exhaust is needed in the midway, the mixing time is controlled to be 20 minutes, and the discharging temperature is controlled to be 190 ℃;
(3) extruding into sheets: feeding the mixed material into a single-screw extruder, pressing the mixed material into a sheet with the required thickness through a die head, wherein the screw temperature of the single-screw extruder is controlled at 200 ℃, and the die head temperature is controlled at 200 ℃;
(4) cutting: and (4) setting the cutting size according to requirements, and cutting the formed sheet to obtain the flame-retardant damping pad for the automobile.
The following tests were performed on the flame retardant damping pad for automobiles manufactured in the above examples:
and (3) flame retardance detection: the flame-retardant damping pad for the automobile manufactured by the embodiment can meet GB8410 and TL1010 standards, and the flame-retardant performance is tested according to PV3357, so that a sample is not ignited in the combustion time, has smoke, does not drop a melt, does not re-ignite, has a damaged area phi 90mm, meets the standard specification and is less than 150mm, and the flame-retardant damping pad is qualified.
Compared with the existing common products, the flame retardant property is tested according to PV3357, and the sample is completely burnt out in about 4min and is unqualified.
And (3) detecting the high temperature resistance: the existing product can meet the high temperature storage requirement of 95 ℃ for 400 hours; the flame-retardant damping pad for the automobile manufactured by the embodiment has high temperature resistance of 130 ℃ and can be stored for 500 hours at high temperature.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The embodiments described above are intended to facilitate the understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. The manufacturing method of the flame-retardant damping cushion for the automobile is characterized by comprising the following steps of:
(1) preparing materials: PP, EPDM, barite powder, aluminum hydroxide and an antioxidant in a weight ratio of (5-15): (5-15): (45-55): (20-30): (0.1-0.5) mixing;
(2) mixing: putting the weighed raw materials into an internal mixer for high-speed kneading;
(3) extruding into sheets: feeding the mixed material into a single-screw extruder, passing through a die head, and pressing into a sheet with required thickness;
(4) cutting: and (4) setting the cutting size according to requirements, and cutting the formed sheet to obtain the flame-retardant damping pad for the automobile.
2. The manufacturing method of the flame-retardant damping pad for the automobile according to claim 1, wherein the PP is copolymerized PP, the melt index is 1.9-3.6 g/10min (230 ℃/2.16kg), the tensile modulus is more than 20MPa, and the flexural modulus is more than 700 MPa.
3. The method of claim 1, wherein the EPDM is an ENB type ethylene propylene diene monomer rubber, the Mooney viscosity is 16-24(ML1+4, 125 ℃), and the ethylene content is 67.5-71.5 wt%.
4. The method for manufacturing the flame-retardant damping pad for the automobile according to claim 1, wherein the barium sulfate content in the barite powder is more than or equal to 92 wt%, and the mesh number is 600 meshes.
5. The method for manufacturing the flame-retardant damping pad for the automobile as claimed in claim 1, wherein the particle size (D50) of the aluminum hydroxide is 2.0-3.0 μm, the ignition loss is 34-35 w%, and the whiteness value is not less than 93%.
6. The method for manufacturing the flame-retardant damping pad for the automobile according to claim 1, wherein the antioxidant is a mixture of an antioxidant 1010 and an antioxidant 168.
7. The method for manufacturing the flame-retardant damping pad for the automobile as claimed in claim 6, wherein the weight ratio of the antioxidant 1010 to the antioxidant 168 is 3: 2.
8. The manufacturing method of the flame-retardant damping pad for the automobile according to any one of claims 1 to 7, wherein the weight ratio of the PP, the EPDM, the barite powder, the aluminum hydroxide and the antioxidant is (5-10): (5-10): (50-55): (20-25): (0.1-0.5).
9. The method for manufacturing the flame-retardant damping pad for the automobile according to claim 1, wherein the air is exhausted in the middle of high-speed kneading, the mixing time is controlled to be 15-20 minutes, and the discharging temperature is controlled to be 180-190 ℃.
10. The method for manufacturing the flame-retardant damping pad for the automobile according to claim 1, wherein the screw temperature of the single-screw extruder is controlled to be 180-200 ℃, and the die head temperature is controlled to be 190-210 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911264145.1A CN110922688A (en) | 2019-12-10 | 2019-12-10 | Manufacturing method of flame-retardant damping cushion for automobile |
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| CN201911264145.1A CN110922688A (en) | 2019-12-10 | 2019-12-10 | Manufacturing method of flame-retardant damping cushion for automobile |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111423655A (en) * | 2020-06-04 | 2020-07-17 | 杨陈 | Environment-friendly flame-retardant hot-melt type damping film for automobile and preparation method thereof |
| CN113956676A (en) * | 2021-02-02 | 2022-01-21 | 福清市胜德塑胶制品有限公司 | Shock-absorbing and buffering exercise mat and preparation method thereof |
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| CN109233078A (en) * | 2018-08-24 | 2019-01-18 | 株洲时代新材料科技股份有限公司 | A kind of rail traffic acoustic dampening composite and preparation method thereof |
| CN109251403A (en) * | 2018-08-24 | 2019-01-22 | 株洲时代新材料科技股份有限公司 | A kind of rail traffic fire-retardant acoustic dampening composite and preparation method thereof |
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| CN103937061A (en) * | 2013-01-18 | 2014-07-23 | 神华集团有限责任公司 | Polyolefin composition, sound insulation material and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111423655A (en) * | 2020-06-04 | 2020-07-17 | 杨陈 | Environment-friendly flame-retardant hot-melt type damping film for automobile and preparation method thereof |
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| CN113956676A (en) * | 2021-02-02 | 2022-01-21 | 福清市胜德塑胶制品有限公司 | Shock-absorbing and buffering exercise mat and preparation method thereof |
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