CN112250952A - Odorless automobile sealing strip and preparation method thereof - Google Patents
Odorless automobile sealing strip and preparation method thereof Download PDFInfo
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- CN112250952A CN112250952A CN202010954280.5A CN202010954280A CN112250952A CN 112250952 A CN112250952 A CN 112250952A CN 202010954280 A CN202010954280 A CN 202010954280A CN 112250952 A CN112250952 A CN 112250952A
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- 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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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0066—Use of inorganic compounding ingredients
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0095—Mixtures of at least two compounding ingredients belonging to different one-dot groups
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
- C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
- C08J9/104—Hydrazines; Hydrazides; Semicarbazides; Semicarbazones; Hydrazones; Derivatives thereof
- C08J9/105—Hydrazines; Hydrazides; Semicarbazides; Semicarbazones; Hydrazones; Derivatives thereof containing sulfur
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- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/04—N2 releasing, ex azodicarbonamide or nitroso compound
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/16—Ethene-propene or ethene-propene-diene copolymers
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- C08J2491/00—Characterised by the use of oils, fats or waxes; Derivatives thereof
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
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- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
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- C08K2003/265—Calcium, strontium or barium carbonate
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Abstract
The invention discloses an odorless automobile sealing strip which is formed by compounding a dense rubber strip and a foamed rubber strip, wherein the dense rubber strip mainly comprises ethylene propylene diene monomer, reinforcing carbon black, environment-friendly oil, heavy calcium, zinc oxide, stearic acid, a surfactant, a bamboo fragrance, sulfur powder, an accelerant and a vulcanizing agent; the foamed rubber strip mainly comprises ethylene propylene diene monomer, reinforcing carbon black environment-friendly oil, activated calcium, zinc oxide, stearic acid, a processing aid, a bamboo fragrance, sulfur powder, an accelerator, a vulcanizing agent, DTDM, DPTT and a foaming agent. According to the invention, ethylene propylene diene monomer EPDM is used as a main material, and various auxiliary materials and fragrances are added to interact with each other, so that the prepared automobile sealing strip is fragrant and has no pungent smell.
Description
Technical Field
The invention relates to the technical field of automobile parts, in particular to an odorless automobile sealing strip and a preparation method thereof.
Background
The automobile sealing strip is one of important parts of an automobile, is widely applied to positions of automobile doors, automobile windows, automobile bodies, skylights, engine cases, trunk (trunk) boxes and the like, has the functions of sound insulation, dust prevention, seepage and shock absorption, and maintains a small environment in the automobile, so that the automobile sealing strip plays an important role in protecting members, electromechanical devices and accessories in the automobile, and the importance of the functions of attractiveness, environmental protection and comfort of the sealing strip is increasingly highlighted along with the development of the automobile industry.
At present, most of automobile sealing strip materials are made of ethylene propylene diene monomer EPDM (ethylene propylene diene monomer) as a main raw material through a vulcanization crosslinking process, but H is generated in the crosslinking process2S、NH4And the like, and the pungent smell generated by the volatilization of the gases has side effects on the health of human bodies.
Therefore, how to provide a natural, safe and non-irritating automobile sealing strip is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the invention provides a natural, safe and non-irritating-smell automobile sealing strip.
In order to achieve the purpose, the invention adopts the following technical scheme:
an odorless automobile sealing strip is compounded by dense rubber and foamed rubber, wherein the dense rubber mainly comprises the following components in parts by weight: 100 parts of ethylene propylene diene monomer, 180-190 parts of reinforcing carbon black, 120-130 parts of environment-friendly oil, 80-90 parts of heavy calcium carbonate, 6-7 parts of zinc oxide, 1-2 parts of stearic acid, 2-4 parts of surfactant, 0.5-0.6 part of bamboo fragrance, 1-1.5 parts of sulfur powder, 1.5-2 parts of accelerator and 1.1-1.5 parts of vulcanizing agent;
the foaming rubber mainly comprises the following components in parts by weight: 100 parts of ethylene propylene diene monomer, 70-80 parts of reinforcing carbon black, 70-80 parts of environment-friendly oil, 40-50 parts of active calcium, 7-8 parts of zinc oxide, 1-2 parts of stearic acid, 1-2 parts of processing aid, 0.4-0.6 part of bamboo fragrance, 1-1.5 parts of sulfur powder, 1-1.5 parts of accelerator, 1.1-1.5 parts of vulcanizing agent, 0.5-1 part of DTDM, 0.6-1 part of DPTT and 3-4 parts of foaming agent. The density of the compact rubber is different from that of the foamed rubber, the ethylene propylene diene monomer is different, the vulcanization system is close, and the components and the types are slightly different.
The selection of the ethylene propylene diene monomer in the foamed rubber simultaneously meets the following conditions: mooney viscosity ML125(1+4) is 90, content of the third monomer (ENB) is 8.9%, and TS1 is 12 seconds under the vulcanization condition that vulcanization speed satisfies 180 ℃;
the selection of the ethylene propylene diene monomer in the dense rubber simultaneously meets the following conditions: mooney viscosity ML125(1+4) is 70, content of the third monomer (ENB) is 4.9%, and TS1 is 31 seconds under the vulcanization condition that vulcanization speed satisfies 180 ℃.
Preferably, in the above odorless automobile sealing strip, the dense rubber strip mainly comprises the following components in parts by weight: 100 parts of ethylene propylene diene monomer, 0-190 parts of reinforcing carbon black SSO-118, 120-130 parts of environment-friendly oil, 80-90 parts of heavy calcium carbonate, 6-7 parts of zinc oxide, 1-2 parts of stearic acid, 2-4 parts of surfactant, 0.5-0.6 part of bamboo fragrance, 1-1.5 parts of sulfur powder, 1.5-2 parts of accelerator ZDBC and 1.1-1.5 parts of vulcanizing agent MBTS.
Further preferably, the compact rubber strip mainly comprises the following components in parts by weight: 100 parts of ethylene propylene diene monomer, 0 part of reinforcing carbon black SSO-1180 part, 125 parts of environment-friendly oil, 90 parts of heavy calcium, 7 parts of zinc oxide, 1.5 parts of stearic acid, 2 parts of surfactant, 0.5 part of bamboo fragrance, 1.5 parts of sulfur powder, 1.5 parts of accelerator ZDBC and 1.5 parts of vulcanizing agent MBTS.
Preferably, in the above odorless automobile sealing strip, the foamed rubber strip mainly comprises the following components in parts by weight: 100 parts of ethylene propylene diene monomer, 70-80 parts of reinforcing carbon black HS-4570, 70-80 parts of environment-friendly oil, 40-50 parts of active calcium, 7-8 parts of zinc oxide, 1-2 parts of stearic acid, 1-2 parts of processing aid, 0.4-0.6 part of bamboo fragrance, 1-1.5 parts of sulfur powder, 1-1.5 parts of accelerator ZDBC, 1.1-1.5 parts of vulcanizing agent MBT, 0.5-1 part of DTDM, 0.6-1 part of DPTT and 3-4 parts of foaming agent OBSH.
Further preferably, the foamed rubber strip mainly comprises the following components in parts by weight: 100 parts of ethylene propylene diene monomer, 80 parts of reinforcing carbon black HS-4580 parts, 70 parts of environment-friendly oil, 50 parts of active calcium, 7 parts of zinc oxide, 1 part of stearic acid, 2 parts of processing aid, 0.6 part of bamboo fragrance, 1.5 parts of sulfur powder, 1.5 parts of accelerator ZDBC, 1.5 parts of vulcanizing agent MBT, 0.5 part of DTDM, 0.6 part of DPTT and 3.5 parts of foaming agent OBSH.
Preferably, in the above one odorless automobile weather strip, the surfactant is activated zinc oxide.
The beneficial effects of the above technical scheme are: it is the most important inorganic activator in rubber industry, and adding active zinc oxide into rubber material can not only accelerate vulcanization speed, but also improve crosslinking degree, and zinc oxide plays a role of promoting auxiliary agent in rubber, and improves vulcanization efficiency.
Preferably, in the above odorless automobile weather strip, the processing aid is a dispersant.
The beneficial effects of the above technical scheme are: the dispersant can improve the dispersivity of carbon black and other powder in rubber material, prevent roller sticking, reduce scorching and shorten processing time, and it also has the functions of improving the flowability and plasticizing of rubber material.
Preferably, in the above one odorless automobile weather strip, the BAMBOO fragrance is BAMBOO fragrance bambo.
The beneficial effects of the above technical scheme are: through experimental research, other essences or fragrances can not well cover the smell of the rubber, and the bamboo fragrance has a good covering effect on the smell of the rubber.
The invention also discloses a preparation method of the odorless automobile sealing strip, which comprises the following steps:
(1) adding ethylene propylene diene monomer, reinforcing carbon black, environment-friendly oil, heavy calcium carbonate/active calcium, zinc oxide, stearic acid and surfactant/processing aid into an internal mixer, stirring at a low speed, and heating to 70 +/-2 ℃;
(2) adding the rest components into different internal mixers according to the composition of the dense rubber and the foamed rubber, continuously stirring and heating to 100 +/-2 ℃ to obtain respective corresponding mixtures;
(3) discharging the mixture from an internal mixer to an open mill, discharging and cooling to obtain dense rubber and foamed rubber respectively;
(4) respectively feeding the dense rubber and the foamed rubber into different extruders, forming through a neck ring mold, and processing into a semi-finished sealing strip through hot air microwave vulcanization;
(5) and carrying out post-processing such as corner connection, interface trimming and the like on the semi-finished product, and packaging to obtain the finished product of the automobile sealing strip.
The sealing strip is prepared by combining various raw materials together, vulcanizing to convert linear rubber macromolecules into macromolecular dense rubber and foamed rubber with a net structure and mechanical properties, and compounding the two rubbers to obtain the sealing strip with sealing, waterproof, windproof and noise-proof functions.
Specifically, the extrusion vulcanization process enables rubber with a high-elasticity linear structure to be continuously molded through a mouth shape required by a product under the interaction of an extruder cylinder and a rotating screw, and further heated, vulcanized and crosslinked through microwave hot air or other heat media to be converted into the rubber with a net structure with mechanical property;
before vulcanization, the rubber is in a linear structure, and the molecules interact with each other by Van der Waals force, so that the rubber has the properties of high plasticity, high elongation and solubility; during vulcanization, molecules are initiated to generate chemical crosslinking reaction; after vulcanization, the rubber is in a net structure, and molecules are mainly combined by chemical bonds, so that the mechanical properties (tensile strength, hardness, tensile strength, elongation and elasticity), physical properties and chemical stability of the rubber are greatly improved.
According to the technical scheme, compared with the prior art, the invention discloses and provides an odorless automobile sealing strip, EPDM (ethylene-propylene-diene monomer) is a main material, reinforcing carbon black is a reinforcing agent, environment-friendly oil is a plasticizer, heavy calcium is a filling agent, zinc oxide and stearic acid are active agents, a dispersing agent is a processing aid, sulfur is a cross-linking agent, other components are used as an accelerator and a foaming agent to play roles, EPDM (ethylene-propylene-diene monomer) is used as a main material, various auxiliary materials and fragrance are added to interact, rubber before vulcanization is of a linear structure, molecules interact by van der Waals force, and the odorless automobile sealing strip has large plasticity, high elongation and dissolubility; during vulcanization, molecules are initiated to generate chemical crosslinking reaction; after vulcanization, the rubber is in a net structure, the finally prepared automobile sealing strip is fragrant and has no pungent smell, the tensile strength of the prepared sealing strip is more than 300 percent, the hardness is 75 +/-5, the tensile strength is more than 7MPA, and the elongation is more than 350 percent.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention discloses a preparation method of an odorless automobile sealing strip, which comprises the following steps:
(1) adding ethylene propylene diene monomer, reinforcing carbon black, environment-friendly oil, heavy calcium carbonate/active calcium, zinc oxide, stearic acid and surfactant/processing aid into an internal mixer, stirring at a low speed, and heating to 70 +/-2 ℃;
(2) adding the rest components into different internal mixers according to the composition of the dense rubber and the foamed rubber, continuously stirring and heating to 100 +/-2 ℃ to obtain respective corresponding mixtures;
(3) discharging the mixture from an internal mixer to an open mill, discharging and cooling to obtain dense rubber and foamed rubber respectively;
(4) respectively feeding the dense rubber and the foamed rubber into different extruders, forming through a neck ring mold, and processing into a semi-finished sealing strip through hot air microwave vulcanization;
(5) and carrying out post-processing on the semi-finished product, and packaging to obtain the finished product of the automobile sealing strip.
Wherein the raw material composition of the solid rubber and the foamed rubber is shown in examples 1-3:
example 1
The dense rubber strip consists of the following components in parts by weight: 100 parts of ethylene propylene diene monomer, 0 part of reinforcing carbon black SSO-1180 part, 125 parts of environment-friendly oil, 90 parts of heavy calcium, 7 parts of zinc oxide, 1.5 parts of stearic acid, 2 parts of surfactant, 0.5 part of bamboo fragrance, 1.5 parts of sulfur powder, 1.5 parts of accelerator ZDBC and 1.5 parts of vulcanizing agent MBTS;
the foaming rubber strip comprises the following components in parts by weight: 100 parts of ethylene propylene diene monomer, 80 parts of reinforcing carbon black HS-4580 parts, 70 parts of environment-friendly oil, 50 parts of active calcium, 7 parts of zinc oxide, 1 part of stearic acid, 2 parts of processing aid, 0.6 part of bamboo fragrance, 1.5 parts of sulfur powder, 1.5 parts of accelerator ZDBC, 1.5 parts of vulcanizing agent MBT, 0.5 part of DTDM, 0.6 part of DPTT and 3.5 parts of foaming agent OBSH.
The sealing strip compounded by the dense rubber strip and the foamed rubber strip prepared in the embodiment 1 is applied to a doorframe sealing strip of a Jili certain vehicle type, the physical performance of a rubber product is not affected, the compression load is 4 +/-2N, the insertion force is less than 50N, the extraction force is more than 60N, and the odor grade is improved to 5.3.
Example 2
The dense rubber strip consists of the following components in parts by weight: 100 parts of ethylene propylene diene monomer, 120 parts of reinforcing carbon black SSO-1180 parts, 120 parts of environment-friendly oil, 80 parts of heavy calcium carbonate, 6 parts of zinc oxide, 1 part of stearic acid, 2 parts of surfactant, 0.5 part of bamboo fragrance, 1 part of sulfur powder, 1.5 parts of accelerator ZDBC and 1.1 parts of vulcanizing agent MBTS;
the foaming rubber strip comprises the following components in parts by weight: 100 parts of ethylene propylene diene monomer, 70 parts of reinforcing carbon black HS-4570 parts, 70 parts of environment-friendly oil, 40 parts of active calcium, 7 parts of zinc oxide, 1 part of stearic acid, 1 part of processing aid, 0.4 part of bamboo fragrance, 1 part of sulfur powder, 1 part of accelerator ZDBC, 1.1 part of vulcanizing agent MBT, 0.5 part of DTDM, 0.6 part of DPTT and 3 parts of foaming agent OBSH.
The sealing strip compounded by the dense rubber strip and the foamed rubber strip prepared in the embodiment 2 is applied to the door frame sealing strip of a Jili certain vehicle type, the physical performance of a rubber product is not affected, the compression load is 4.5 +/-2N, the insertion force is less than 50N, the extraction force is more than 60N, and the odor grade is improved to 5.5 grade.
Example 3
The dense rubber strip consists of the following components in parts by weight: 100 parts of ethylene propylene diene monomer, 100 parts of reinforcing carbon black SSO-1190 parts, 130 parts of environment-friendly oil, 90 parts of heavy calcium carbonate, 7 parts of zinc oxide, 2 parts of stearic acid, 4 parts of surfactant, 0.6 part of bamboo fragrance, 1.5 parts of sulfur powder, 2 parts of accelerator ZDBC and 1.5 parts of vulcanizing agent MBTS;
the foaming rubber strip comprises the following components in parts by weight: 100 parts of ethylene propylene diene monomer, 80 parts of reinforcing carbon black HS-4580 parts, 80 parts of environment-friendly oil, 50 parts of active calcium, 8 parts of zinc oxide, 2 parts of stearic acid, 2 parts of processing aid, 0.6 part of bamboo fragrance, 1.5 parts of sulfur powder, 1.5 parts of accelerator ZDBC, 1.5 parts of vulcanizing agent MBT, 1 part of DTDM, 1 part of DPTT and 4 parts of foaming agent OBSH.
The sealing strip compounded by the dense rubber strip and the foamed rubber strip prepared in the embodiment 3 is applied to the door frame sealing strip of a Jili certain vehicle type, the physical performance of a rubber product is not affected, the compression load is 3.5 +/-1.5N, the insertion force is less than 50N, the extraction force is more than 60N, and the odor grade is improved to 5.1 grade.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the scheme disclosed by the embodiment, the scheme corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. The utility model provides an odorless automobile sealing strip which characterized in that, is formed by closely knit rubber strip and foaming rubber strip complex, wherein closely knit rubber strip mainly includes the component of following parts by weight: 100 parts of ethylene propylene diene monomer, 180-190 parts of reinforcing carbon black, 120-130 parts of environment-friendly oil, 80-90 parts of heavy calcium carbonate, 6-7 parts of zinc oxide, 1-2 parts of stearic acid, 2-4 parts of surfactant, 0.5-0.6 part of bamboo fragrance, 1-1.5 parts of sulfur powder, 1.5-2 parts of accelerator and 1.1-1.5 parts of vulcanizing agent;
the foaming rubber strip mainly comprises the following components in parts by weight: 100 parts of ethylene propylene diene monomer, 70-80 parts of reinforcing carbon black, 70-80 parts of environment-friendly oil, 40-50 parts of active calcium, 7-8 parts of zinc oxide, 1-2 parts of stearic acid, 1-2 parts of processing aid, 0.4-0.6 part of bamboo fragrance, 1-1.5 parts of sulfur powder, 1-1.5 parts of accelerator, 1.1-1.5 parts of vulcanizing agent, 0.5-1 part of DTDM, 0.6-1 part of DPTT and 3-4 parts of foaming agent.
2. The odorless automobile sealing strip according to claim 1, wherein the dense rubber strip mainly comprises the following components in parts by weight: 100 parts of ethylene propylene diene monomer, 0-190 parts of reinforcing carbon black SSO-118, 120-130 parts of environment-friendly oil, 80-90 parts of heavy calcium carbonate, 6-7 parts of zinc oxide, 1-2 parts of stearic acid, 2-4 parts of surfactant, 0.5-0.6 part of bamboo fragrance, 1-1.5 parts of sulfur powder, 1.5-2 parts of accelerator ZDBC and 1.1-1.5 parts of vulcanizing agent MBTS.
3. The odorless automobile sealing strip according to claim 1, wherein the foamed rubber strip mainly comprises the following components in parts by weight: 100 parts of ethylene propylene diene monomer, 70-80 parts of reinforcing carbon black HS-4570, 70-80 parts of environment-friendly oil, 40-50 parts of active calcium, 7-8 parts of zinc oxide, 1-2 parts of stearic acid, 1-2 parts of processing aid, 0.4-0.6 part of bamboo fragrance, 1-1.5 parts of sulfur powder, 1-1.5 parts of accelerator ZDBC, 1.1-1.5 parts of vulcanizing agent MBT, 0.5-1 part of DTDM, 0.6-1 part of DPTT and 3-4 parts of foaming agent OBSH.
4. The odorless automotive weatherstrip of any one of claim 1 wherein said surfactant is activated zinc oxide.
5. The odorless automotive weatherstrip of any one of claim 1 wherein said processing aid is a dispersant.
6. An odorless automotive weatherstrip according to any one of claims 1 to 5 wherein said BAMBOO fragrance is BAMBOO fragrance bambo.
7. The method for preparing the odorless automobile weather strip according to any one of claims 1 to 6, comprising the steps of:
(1) adding ethylene propylene diene monomer, reinforcing carbon black, environment-friendly oil, heavy calcium carbonate/active calcium, zinc oxide, stearic acid and surfactant/processing aid into an internal mixer, stirring at a low speed, and heating to 70 +/-2 ℃;
(2) adding the rest components into different internal mixers according to the composition of the dense rubber and the foamed rubber, continuously stirring and heating to 100 +/-2 ℃ to obtain respective corresponding mixtures;
(3) discharging the mixture from an internal mixer to an open mill, discharging and cooling to obtain dense rubber and foamed rubber respectively;
(4) respectively feeding the dense rubber and the foamed rubber into different extruders, forming through a neck ring mold, and processing into a semi-finished sealing strip through hot air microwave vulcanization;
(5) and carrying out post-processing on the semi-finished product, and packaging to obtain the finished product of the automobile sealing strip.
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| CN202010954280.5A CN112250952A (en) | 2020-09-11 | 2020-09-11 | Odorless automobile sealing strip and preparation method thereof |
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| CN202010954280.5A CN112250952A (en) | 2020-09-11 | 2020-09-11 | Odorless automobile sealing strip and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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