CN111218117A - Elastic foam material, preparation method thereof and automobile skylight sunshade curtain rail limiting strip - Google Patents
Elastic foam material, preparation method thereof and automobile skylight sunshade curtain rail limiting strip Download PDFInfo
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- CN111218117A CN111218117A CN202010134600.2A CN202010134600A CN111218117A CN 111218117 A CN111218117 A CN 111218117A CN 202010134600 A CN202010134600 A CN 202010134600A CN 111218117 A CN111218117 A CN 111218117A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- 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
- C08J9/102—Azo-compounds
- C08J9/103—Azodicarbonamide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60J—WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES
- B60J7/00—Non-fixed roofs; Roofs with movable panels, e.g. rotary sunroofs
- B60J7/0007—Non-fixed roofs; Roofs with movable panels, e.g. rotary sunroofs moveable head-liners, screens, curtains or blinds for ceilings
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0014—Use of organic additives
- C08J9/0023—Use of organic additives containing oxygen
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- 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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/04—N2 releasing, ex azodicarbonamide or nitroso compound
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2383/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
- C08J2383/04—Polysiloxanes
- C08J2383/07—Polysiloxanes containing silicon bound to unsaturated aliphatic groups
-
- 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
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/14—Peroxides
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Emergency Medicine (AREA)
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Abstract
The invention discloses an elastic foaming material, which is formed by combining polymethyl vinyl siloxane rubber serving as a substrate with an organic foaming agent and performing microwave heating and cyclic vulcanization under the catalysis of a cross-linking agent; the raw materials for preparing the elastic foaming material comprise the following components in percentage by mass: 85-95% of polymethylvinylsiloxane rubber, 2-8% of organic foaming agent, 2-5% of cross-linking agent and 0.1-3% of color master batch. The invention also discloses a preparation method of the elastic foaming material and an automobile skylight sun-shading curtain track limiting strip prepared from the elastic foaming material. According to the invention, the substrate is combined with the foaming agent and subjected to microwave heating circulating vulcanization molding under the action of the cross-linking agent, so that the obtained material has the advantages of uniform foaming pores, low density, good resilience and smooth surface.
Description
Technical Field
The invention relates to the technical field of high polymer materials, in particular to an elastic foam material, a preparation method thereof and a track limiting strip of a sun-shading curtain of an automobile skylight.
Background
At present, in the automobile industry, panoramic sunroofs are widely popularized, the panoramic sunroofs enable the visual field of drivers to be wider, however, the roofs can be irradiated by more sunlight and ultraviolet rays, and therefore, sun-shading curtains are required to be installed on the automobile sunroofs to shade the sunlight and the ultraviolet rays. The sunshade curtain is assembled in the track of panorama skylight both sides, adjusts the position of sunshade curtain through the removal of slider in the track. In present design, can only the relative slip between slider and the track, the width between the skylight slide rail is a fixed value, but current sunshade screen is because the material reason, along with sunshine ultraviolet irradiation, leads to the size to change after the temperature risees, under the unchangeable condition of width size again between the guide rail, leads to drawing the curtain at the pulling force nonconformity of guide rail both sides, causes the noise that sends easily, and the pulling is not smooth and easy.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention provides an elastic foam material, which reduces the density of the material, promotes the uniform distribution of foam cells of the foam material, and improves the resilience and surface smoothness of the material.
The invention also aims to provide a preparation method of the elastic foaming material, which comprises the steps of carrying out microwave heating circulation vulcanization, setting a sectional heating vulcanization mode, accurately controlling temperature difference in each section, reducing the density of the material, and improving the distribution uniformity, resilience and surface smoothness of foaming pores of the material.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
an elastic foaming material is prepared by combining polymethyl vinyl siloxane rubber (VMQ) serving as a substrate with an organic foaming agent, and performing microwave heating cyclic vulcanization molding under the catalysis of a cross-linking agent; the raw materials for preparing the elastic foaming material comprise the following components in percentage by mass:
85-95% of polymethylvinylsiloxane rubber (VMQ),
2 to 8 percent of organic foaming agent,
2 to 5 percent of cross-linking agent,
0.1-3% of color master batch.
As a further preferable scheme, the raw materials for preparing the elastic foaming material comprise the following components in percentage by mass:
89.5 to 92.6 percent of polymethyl vinyl siloxane rubber (VMQ),
3 to 5 percent of organic foaming agent,
3 to 5 percent of cross-linking agent,
0.5-1% of color master batch.
In a further preferred embodiment, the organic blowing agent of the present invention is an OBSH or AC blowing agent.
In a further preferred embodiment, the crosslinking agent of the present invention is bis-tetra-crosslinking agent (2, 4-dichloroperoxybenzoyl) or platinum vulcanizing agent.
In a more preferable embodiment, the density of the elastic foaming material of the invention is 0.3 to 0.6g/cm3。
A method for preparing an elastic foam material comprises
Mixing: adding part of polymethylvinylsiloxane rubber (VMQ), color master and organic foaming agent in the formula amount into a mixing roll, mixing uniformly, then adding a cross-linking agent, continuously mixing uniformly, finally adding the rest polymethylvinylsiloxane rubber (VMQ), and continuously mixing to obtain a mixed material;
a feeding step: putting the mixed material into an extruder head, and extruding from a die port;
and (3) vulcanization molding: conveying the mixed material extruded from the port of the mold into a microwave heating circulating vulcanization drying tunnel box through a conveyor belt to be heated and vulcanized and molded in sections to obtain a vulcanized and molded rubber strip;
and (3) secondary vulcanization: the vulcanized rubber strip is placed in a baking oven for baking.
As a further preferable scheme, in the vulcanization molding step of the present invention, the vulcanization tank for the sectional heating vulcanization molding is divided into 9 temperature sections, the vulcanization time of each temperature section is 20 to 25s, and each temperature section is set as follows:
a first temperature section: the temperature is 180-185 ℃ and the temperature is lower than the normal temperature,
a second temperature section: the temperature is 175-179 ℃ and,
a third temperature stage: the temperature is between 172 and 174 ℃,
a fourth temperature section: the temperature is 167-171 ℃,
a fifth temperature stage: the temperature is 163-166 ℃,
a sixth temperature stage: the temperature is 155-162 ℃,
a seventh temperature stage: the temperature is 147-154 ℃,
an eighth temperature stage: the temperature is 143-146 ℃,
a ninth temperature stage: the temperature is 140-142 ℃,
as a further preferable scheme, in the feeding step, a screw with the diameter of 60-80 mm is adopted as an extruder head, the length-diameter ratio of the screw is 12:1, the maximum extrusion amount is 20kg/h, and the extrusion speed is 30-80 rpm/min.
As a further preferable scheme, in the secondary vulcanization step, the baking temperature is 180-200 ℃, and the baking time is 0.5-1.5 h.
A track limiting strip of a sun-shading curtain of an automobile skylight is prepared by adopting the elastic foaming material.
Compared with the prior art, the invention has the following beneficial effects:
1. the elastic foaming material is prepared by combining polymethyl vinyl siloxane (VMQ) serving as a substrate with a foaming agent and performing microwave heating circulating vulcanization molding under the action of a cross-linking agent, and the obtained material has the advantages of uniform foaming pores, low density, good resilience and smooth surface.
2. In the preparation method of the elastic foaming material, the microwave heating circulating vulcanization molding specifically adopts sectional heating, each section accurately controls the temperature difference, and the balanced temperature is utilized to promote the reaction among the cross-linking agent, the organic foaming agent and the base material in the material, so that the molecular chains of the base material are cross-linked to generate the high-elasticity foaming body.
3. The elastic foaming material is applied to preparing the track limiting strip of the sun-shading curtain of the automobile skylight, and the skylight roller shutter can still keep smooth retraction and pulling without noise abnormity after being deformed at high temperature and changed in size due to the high resilience performance of the elastic foaming material.
Detailed Description
The invention will be further described with reference to specific embodiments:
the elastic foaming material is formed by combining polymethyl vinyl siloxane (VMQ) serving as a substrate with an organic foaming agent and performing microwave heating and cyclic vulcanization under the catalysis of a cross-linking agent; the raw materials for preparing the elastic foaming material comprise the following components in percentage by mass:
85-95% of polymethylvinylsiloxane rubber (VMQ),
2 to 8 percent of organic foaming agent,
2 to 5 percent of cross-linking agent,
0.1-3% of color master batch.
As a further preferable scheme, the raw materials for preparing the elastic foaming material comprise the following components in percentage by mass:
89.5 to 92.6 percent of polymethyl vinyl siloxane rubber (VMQ),
3 to 5 percent of organic foaming agent,
3 to 5 percent of cross-linking agent,
0.5-1% of color master batch.
In a further preferable scheme, the organic foaming agent disclosed by the invention is an OBSH (4,4' -oxybis-benzenesulfonylhydrazide) or AC foaming agent or a ZX-JY168 physical foaming agent.
As a further preferable scheme, the cross-linking agent is bis-tetra (2, 4-dichloroperoxybenzoyl) cross-linking agent or platinum vulcanizing agent, and the cross-linking agent has the characteristics of high vulcanizing temperature and high vulcanizing speed.
In a more preferable embodiment, the density of the elastic foaming material of the invention is 0.3 to 0.6g/cm3。
The raw materials for preparing the elastic foaming material also comprise 0.5-1.5% of impurities.
A method for preparing an elastic foam material comprises
Mixing: adding part of polymethylvinylsiloxane rubber (VMQ), color master and organic foaming agent in the formula amount into a mixing roll, mixing uniformly, then adding a cross-linking agent, continuously mixing uniformly, finally adding the rest polymethylvinylsiloxane rubber (VMQ), and continuously mixing to obtain a mixed material;
a feeding step: putting the mixed material into an extruder head, and extruding from a die port;
and (3) vulcanization molding: conveying the mixed material extruded from the port of the mold into a microwave heating circulating vulcanization drying tunnel box through a conveyor belt to be heated and vulcanized and molded in sections to obtain a vulcanized and molded rubber strip;
and (3) secondary vulcanization: the vulcanized rubber strip is placed in a baking oven for baking.
As a further preferable scheme, in the vulcanization molding step of the present invention, the vulcanization tank for the sectional heating vulcanization molding is divided into 9 temperature sections, the vulcanization time of each temperature section is 20 to 25s, and each temperature section is set as follows:
a first temperature section: the temperature is 180-185 ℃ and the temperature is lower than the normal temperature,
a second temperature section: the temperature is 175-179 ℃ and,
a third temperature stage: the temperature is between 172 and 174 ℃,
a fourth temperature section: the temperature is 167-171 ℃,
a fifth temperature stage: the temperature is 163-166 ℃,
a sixth temperature stage: the temperature is 155-162 ℃,
a seventh temperature stage: the temperature is 147-154 ℃,
an eighth temperature stage: the temperature is 143-146 ℃,
a ninth temperature stage: the temperature is 140-142 ℃,
in the scheme, the forming temperature of the vulcanizing tank is set to 9 temperature sections, the temperature difference of each section is accurately controlled, and the crosslinking agent and the organic foaming agent in the material are promoted to react with the polymethyl vinyl siloxane rubber (VMQ) serving as a base material by using balanced temperature, so that the molecular chains of the VMQ are crosslinked, and the high-elasticity foaming body is generated.
Furthermore, in the vulcanization forming step, the vulcanization time at different temperature sections can be accurately controlled by controlling the speed of the conveyor belt. Preferably, the speed of the conveyor belt is 300-600 mm/min.
In the feeding step, an extruder head adopts a screw with the diameter of 60-80 mm, the length-diameter ratio of the screw is 12:1, the maximum extrusion amount is 20kg/h, and the extrusion speed is 30-80 rpm/min.
As a further preferable scheme, in the secondary vulcanization step, the baking temperature is 180-200 ℃, and the baking time is 0.5-1.5 h.
A track limiting strip of a sun-shading curtain of an automobile skylight is prepared by adopting the elastic foaming material.
The following are specific examples of the present invention, and the raw materials, facilities and the like in the following examples are commercially available, unless the present invention is particularly limited.
Examples 1 to 5
The elastic foams of examples 1-5 were prepared by the following method, and the specific parameter settings for examples 1-5 are shown in Table 1.
Mixing: adding part of polymethylvinylsiloxane rubber (VMQ), color master and organic foaming agent in the formula amount into a mixing roll, mixing uniformly, then adding a cross-linking agent, continuously mixing uniformly, finally adding the rest polymethylvinylsiloxane rubber (VMQ), and continuously mixing to obtain a mixed material;
a feeding step: putting the mixed material into an extruder head, and extruding the mixed material from a die port, wherein the extruder head adopts a phi 60-phi 80mm screw, the length-diameter ratio of the screw is 12:1, the maximum extrusion amount is 20kg/h, and the extrusion speed is 30-80 rpm/min;
and (3) vulcanization molding: the mixed material extruded from the port of the die is sent to a drying channel of a microwave heating circulating vulcanization box through a conveyor belt to be heated and vulcanized and molded in sections, the vulcanization box for vulcanization molding is divided into 9 temperature sections, the vulcanization time of each temperature section is 20-25s, and the setting of each temperature section is as follows:
a first temperature section: the temperature is 180-185 ℃ and the temperature is lower than the normal temperature,
a second temperature section: the temperature is 175-179 ℃ and,
a third temperature stage: the temperature is between 172 and 174 ℃,
a fourth temperature section: the temperature is 167-171 ℃,
a fifth temperature stage: the temperature is 163-166 ℃,
a sixth temperature stage: the temperature is 155-162 ℃,
a seventh temperature stage: the temperature is 147-154 ℃,
an eighth temperature stage: the temperature is 143-146 ℃,
a ninth temperature stage: the temperature is 140-142 ℃,
obtaining a vulcanized rubber strip;
and (3) secondary vulcanization: the vulcanized rubber strip is placed in a baking oven for baking at the temperature of 180-200 ℃ for 0.5-1.5 h.
Table 1: example 1-parameter settings of example 5
Testing of performance parameters
The foamed materials of examples 1 to 5 described above were subjected to performance tests, and the items and results of the tests are shown in Table 2.
1. And (3) testing a compression force value: whether the design of the compression amount of the product on the guide rail is matched or not is shown, 19.7N force value is applied to the direction of 5mm of the foaming strip, and the compression distance of the foaming materials of the examples 1-5 is observed.
2. Density measurement: the density of the elastic foams described in examples 1 to 5 was measured to ensure the softness of the product.
3. The mechanical properties of the product in the high temperature state were verified by the ageing performance, amplified as disclosed in DIN 53508.
4. And (3) the flame retardant property is verified whether the material meets the combustion requirement of the automotive upholstery by adopting the method disclosed by FMVSS 302.
5. Automotive interior volatility (VOC/FOG) measurements volatiles were measured from the elastic foams of examples 1-5 using TS-INT-001 (2014).
6. And (4) detecting harmful substances.
Table 2: results of performance parameter testing
Various other modifications and changes may occur to those skilled in the art, such as those described above, and other embodiments, and it is intended that all such modifications and changes fall within the scope of the appended claims.
Claims (10)
1. An elastic foaming material is characterized in that polymethyl vinyl siloxane rubber is used as a substrate and is combined with an organic foaming agent, and the elastic foaming material is formed by microwave heating and cyclic vulcanization under the catalysis of a cross-linking agent; the raw materials for preparing the elastic foaming material comprise the following components in percentage by mass:
85-95% of polymethyl vinyl siloxane rubber,
2 to 8 percent of organic foaming agent,
2 to 5 percent of cross-linking agent,
0.1-3% of color master batch.
2. The elastic foamed material according to claim 1, wherein the raw materials for preparing the elastic foamed material comprise the following components in percentage by mass:
89.5 to 92.6 percent of polymethyl vinyl siloxane rubber,
3 to 5 percent of organic foaming agent,
3 to 5 percent of cross-linking agent,
0.5-1% of color master batch.
3. An elastic foamed material according to claim 1 or 2, characterized in that the organic foaming agent is an OBSH or AC foaming agent.
4. The elastic foamed material according to claim 1 or 2, wherein the crosslinking agent is bis-tetra (2, 4-dichloroperoxybenzoyl) crosslinking agent or platinum vulcanizing agent.
5. The elastic foamed material according to claim 1 or 2, wherein the density of the elastic foamed material is 0.3 to 0.6g/cm3。
6. A process for the preparation of an elastic cellular material according to any one of claims 1 to 5, comprising
Mixing: adding part of polymethylvinylsiloxane rubber, color master and organic foaming agent in the formula amount into a mixing roll, mixing uniformly, then adding a cross-linking agent, continuously mixing uniformly, finally adding the rest polymethylvinylsiloxane rubber, and continuously mixing to obtain a mixed material;
a feeding step: putting the mixed material into an extruder head, and extruding from a die port;
and (3) vulcanization molding: conveying the mixed material extruded from the port of the mold into a microwave heating circulating vulcanization drying tunnel box through a conveyor belt to be heated and vulcanized and molded in sections to obtain a vulcanized and molded rubber strip;
and (3) secondary vulcanization: the vulcanized rubber strip is placed in a baking oven for baking.
7. The method for preparing elastic foamed material according to claim 6, wherein in the vulcanization molding step, the vulcanization tank for the sectional heating vulcanization molding is divided into 9 temperature sections, each temperature section has a vulcanization time of 20-25s, and each temperature section is set as follows:
a first temperature section: the temperature is 180-185 ℃ and the temperature is lower than the normal temperature,
a second temperature section: the temperature is 175-179 ℃ and,
a third temperature stage: the temperature is between 172 and 174 ℃,
a fourth temperature section: the temperature is 167-171 ℃,
a fifth temperature stage: the temperature is 163-166 ℃,
a sixth temperature stage: the temperature is 155-162 ℃,
a seventh temperature stage: the temperature is 147-154 ℃,
an eighth temperature stage: the temperature is 143-146 ℃,
a ninth temperature stage: the temperature is 140-142 ℃.
8. The preparation method of the elastic foaming material according to claim 6, wherein in the feeding step, a screw with the diameter of 60-80 mm is adopted as an extruder head, the length-diameter ratio of the screw is 12:1, the maximum extrusion amount is 20kg/h, and the extrusion rate is 30-80 rpm/min.
9. The method for preparing an elastic foamed material according to claim 6, wherein in the secondary vulcanization step, the baking temperature is 180 to 200 ℃ and the baking time is 0.5 to 1.5 hours.
10. A track limiting strip of a sun-shading curtain of an automobile skylight is characterized by being prepared from the elastic foaming material of any one of claims 1 to 5.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010134600.2A CN111218117A (en) | 2020-03-02 | 2020-03-02 | Elastic foam material, preparation method thereof and automobile skylight sunshade curtain rail limiting strip |
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| CN202010134600.2A CN111218117A (en) | 2020-03-02 | 2020-03-02 | Elastic foam material, preparation method thereof and automobile skylight sunshade curtain rail limiting strip |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111923703A (en) * | 2020-08-20 | 2020-11-13 | 上海济雨实业有限公司 | Light automobile skylight structural member and preparation method thereof |
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