CN114874528A - Modified HDPE composite material for automobile headrest framework and preparation method thereof - Google Patents
Modified HDPE composite material for automobile headrest framework and preparation method thereof Download PDFInfo
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- CN114874528A CN114874528A CN202210634444.5A CN202210634444A CN114874528A CN 114874528 A CN114874528 A CN 114874528A CN 202210634444 A CN202210634444 A CN 202210634444A CN 114874528 A CN114874528 A CN 114874528A
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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
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethene
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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
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/24—Crystallisation aids
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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
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/062—HDPE
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Abstract
The invention discloses a modified HDPE composite material for an automobile headrest framework and a preparation method thereof, and provides the following technical scheme aiming at the problems of low mechanical strength, easy aging and easy brittleness of the existing HDPE modified material, wherein the modified HDPE composite material is prepared from the following raw materials in parts by weight: 80-100 parts of High Density Polyethylene (HDPE), 1-20 parts of toughening agent, 0-0.2 part of nucleating agent, 0.1-0.5 part of light stabilizer and 0.1-1 part of other auxiliary agents. The preparation method comprises the steps of material preparation, premixing and mixing. According to the invention, the toughening agent and other functional auxiliaries are utilized, so that the material has good mechanical property, aging resistance and embrittlement resistance, can be applied to an automobile headrest framework structure material, further expands the application range of the HDPE material in the automobile industry, and is simple in preparation method and low in raw material cost.
Description
Technical Field
The invention relates to the field of automobile materials, in particular to a modified HDPE composite material for an automobile headrest framework and a preparation method thereof.
Background
With the development of the automobile industry, more and more automobile parts select modified engineering plastics to replace metal parts, and applicable plastic varieties are more and more, such as PP (polypropylene), PA (nylon), ABS (polyacrylonitrile-butadiene-styrene), PBT (polybutylene terephthalate), PET (polyethylene terephthalate), HDPE (high density polyethylene) and the like. The application of the plastic to the automobile has been developed for more than half a century, the lightweight development of the automobile is greatly promoted, good driving experience and riding comfort are provided for a driver, and a space is provided for energy conservation and emission reduction.
In the development and application processes of numerous automotive plastics, HDPE is increasingly valued by the automotive industry interior trim industry because it is safe and non-toxic and does not have pungent odor similar to other materials. The HDPE material has good heat resistance and cold resistance, is outstanding in toughness, low in water absorption, and excellent in insulating performance and radiation resistance.
Although HDPE has many advantages, HDPE has mechanical properties inferior to PP and is prone to aging and brittleness, so that the application range of HDPE in the automobile industry is narrow. At present, the HDPE modification is mainly based on toughening modification of the advantages of the HDPE, and the HDPE modification is mainly based on non-load-bearing members in the application scene of the automobile industry. Therefore, how to modify HDPE in terms of mechanical properties to broaden the application range of HDPE is a problem which needs to be solved urgently in the industry at present.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a modified HDPE composite material for an automobile headrest framework and a preparation method thereof, and the modified HDPE composite material has the advantages of strong mechanical property, aging resistance, embrittlement resistance, simple preparation method and low raw material cost.
In order to achieve the purpose, the invention provides the following technical scheme:
a modified HDPE composite material for an automobile headrest framework is prepared from the following raw materials in parts by weight: 80-100 parts of High Density Polyethylene (HDPE), 1-20 parts of toughening agent, 0-0.2 part of nucleating agent, 0.1-0.5 part of light stabilizer and 0.1-1 part of other auxiliary agents.
By adopting the technical scheme, the toughness and the impact resistance of the HDPE can be enhanced by adding the toughening agent, so that the HDPE is not easy to break when being impacted, and the parameter requirements of the automobile headrest framework are met, so that the automobile headrest framework can be made of the material, and the application range of the HDPE material in the automobile industry field is widened; the nucleating agent and the toughening agent can play a synergistic role by adding, so that the toughening agent can play a better toughening effect, and the material is endowed with more stable comprehensive performance; by adding the light stabilizer, the aging resistance and ultraviolet resistance of the HDPE can be greatly improved, the application range and application scene of the HDPE material can be further widened, and the HDPE material can play a remarkable role in the field of automobile headrest frameworks.
Further, the HDPE resin is a white powder or granular thermoplastic polyolefin produced by copolymerizing ethylene, and the molecular weight of the HDPE is in the range of 4 to 30 ten thousand.
By adopting the technical scheme, the HDPE material in the molecular weight range can be optimally combined with various modifiers and has optimal mechanical properties in actual production.
Further, the toughening agent is a mixture of an ethylene-octene copolymer type toughening agent (POE) and a linear low density polyethylene type toughening agent (LLDPE), wherein the ratio of POE: the weight ratio range of LLDPE is 1: (1-5).
By adopting the technical scheme, POE and LLDPE are jointly used as the toughening agent, the mechanical property of the HDPE material can be further enhanced, and simultaneously, the ageing resistance and the embrittlement resistance of the HDPE material can be further enhanced under the synergistic effect of POE and LLDPE.
Further, the light stabilizer is selected from one or more of hindered phenolic compounds and hindered amine compounds.
By adopting the technical scheme, the light stabilizer can play the best effects of aging resistance and ultraviolet resistance in actual production.
Further, other auxiliary agents comprise an antioxidant, and the antioxidant is a compound antioxidant containing a free radical scavenger.
By adopting the technical scheme, the anti-aging performance of HDPE can be enhanced to a certain extent by adopting the antioxidant in actual production.
A preparation method of a modified HDPE composite material for an automobile headrest framework comprises the following steps:
step one, preparing materials: weighing the raw materials according to the weight ratio of the formula;
step two, premixing: adding the raw materials weighed in the step one into a high-speed mixer for blending to obtain a premix;
step three, mixing: and D, putting the premix obtained in the step two into a double-screw extruder for mixing, and extruding and granulating to obtain the modified HDPE composite material for the automobile headrest framework.
By adopting the technical scheme, the preparation method is simple in process flow, less in steps, convenient for reducing the production cost and beneficial to increasing the overall income.
Further, the raw materials are firstly subjected to hot mixing and then subjected to cold mixing in a high-speed mixer, wherein the hot mixing temperature is 90-120 ℃, and the cold mixing temperature is 20-60 ℃.
By adopting the technical scheme, the hot-mixing and cold-mixing process is adopted, so that the water content of the raw materials is reduced better, the phenomenon that the product quality is reduced due to more air holes in the product produced by the finally prepared HDPE material is avoided, and meanwhile, the fusion degree of each raw material in the obtained mixed material is best, and the mixing efficiency and the mixing effect are improved.
And further, standing and curing for 1-3 hours after blending in the second step.
By adopting the technical scheme and adopting a standing curing process, the method is beneficial to improving the fusion degree of various raw materials, and simultaneously can improve the plasticity of the raw materials, thereby facilitating the operation of the subsequent flow.
Furthermore, the temperature of each zone of the screw of the double-screw extruder in the third step is 170-230 ℃, and the rotating speed of the screw is 250-600 revolutions per minute.
By adopting the technical scheme, in the actual production, the stirring and smelting effects of the double-screw extruder in the rotating speed range are the best, the raw materials cannot be hardened, and the method is favorable for further improving the fusion degree of various raw materials.
Further, preheating is needed for 3-5 min before the mixing of the double-screw extruder in the third step.
By adopting the technical scheme, the material temperature in the double-screw extruder is kept consistent through the preheating energy, and the smelting effect is further promoted.
In conclusion, the invention has the following beneficial effects:
1. the HDPE material provided by the invention has excellent mechanical properties, and has excellent ageing resistance and embrittlement resistance;
2. the preparation method of the HDPE material provided by the invention is simple, has fewer steps, is beneficial to reducing the production cost and improving the comprehensive economic benefit;
3. the HDPE material provided by the invention adopts two modifiers POE and LLPE, which can generate synergistic effect and have better modification effect.
Detailed Description
The present invention will be described in detail with reference to examples.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Example 1
A modified HDPE composite material for an automobile headrest framework is prepared from the following raw materials in parts by weight:
100 parts of HDPE, 0.1 part of nucleating agent, 0.15 part of stabilizer and 0.5 part of other auxiliary agent (antioxidant).
The preparation method comprises the following steps:
step one, preparing materials: the raw materials are weighed one by one according to the weight ratio of the components for standby.
Step two, premixing: and (2) adding the raw materials weighed in the step one into a high-speed mixer, firstly carrying out hot mixing at 90 ℃ for 5min, then carrying out cold mixing at 20 ℃ for 5min, and standing and curing at room temperature for 1h after the cold mixing is finished to obtain the premix.
Step three, mixing: and (3) putting the premix obtained in the step two into a double-screw extruder, preheating for 5 minutes to enable the temperature of each zone of the screw to reach 210 ℃, keeping the temperature of 210 ℃, and extruding and granulating at the screw rotating speed of 480 revolutions per minute to obtain the modified HDPE composite material for the automobile headrest framework.
Example 2
A modified HDPE composite material for an automobile headrest framework is prepared from the following raw materials in parts by weight:
90 parts of HDPE, 10 parts of POE toughening agent, 0.15 part of stabilizer and 0.5 part of other auxiliary agent (antioxidant).
The preparation method comprises the following steps:
step one, preparing materials: the raw materials are weighed one by one according to the weight ratio of the components for standby.
Step two, premixing: and (2) adding the raw materials weighed in the step one into a high-speed mixer, firstly carrying out hot mixing at 90 ℃ for 5min, then carrying out cold mixing at 20 ℃ for 5min, and standing and curing at room temperature for 1h after the cold mixing is finished to obtain the premix.
Step three, mixing: and (3) putting the premix obtained in the step two into a double-screw extruder, preheating for 5 minutes to enable the temperature of each zone of the screw to reach 210 ℃, keeping the temperature of 210 ℃, and extruding and granulating at the screw rotating speed of 480 revolutions per minute to obtain the modified HDPE composite material for the automobile headrest framework.
Example 3
A modified HDPE composite material for an automobile headrest framework is prepared from the following raw materials in parts by weight:
90 parts of HDPE, 10 parts of LLDPE toughening agent, 0.1 part of nucleating agent, 0.15 part of stabilizing agent and 0.5 part of other auxiliary agent (antioxidant).
The preparation method comprises the following steps:
step one, preparing materials: the raw materials are weighed one by one according to the weight ratio of the components for standby.
Step two, premixing: and (2) adding the raw materials weighed in the step one into a high-speed mixer, firstly carrying out hot mixing at 90 ℃ for 5min, then carrying out cold mixing at 20 ℃ for 5min, and standing and curing at room temperature for 1h after the cold mixing is finished to obtain the premix.
Step three, mixing: and (3) putting the premix obtained in the step two into a double-screw extruder, preheating for 5 minutes to enable the temperature of each zone of the screw to reach 210 ℃, keeping the temperature of 210 ℃, and extruding and granulating at the screw rotating speed of 480 revolutions per minute to obtain the modified HDPE composite material for the automobile headrest framework.
Example 4
A modified HDPE composite material for an automobile headrest framework is prepared from the following raw materials in parts by weight:
90 parts of HDPE, 10 parts of POE toughening agent, 0.1 part of nucleating agent, 0.15 part of stabilizing agent and 0.5 part of other auxiliary agent (antioxidant).
The preparation method comprises the following steps:
step one, preparing materials: the raw materials are weighed one by one according to the weight ratio of the components for standby.
Step two, premixing: and (2) adding the raw materials weighed in the step one into a high-speed mixer, firstly carrying out hot mixing at 90 ℃ for 5min, then carrying out cold mixing at 20 ℃ for 5min, and standing and curing at room temperature for 1h after the cold mixing is finished to obtain the premix.
Step three, mixing: and (3) putting the premix obtained in the step two into a double-screw extruder, preheating for 5 minutes to enable the temperature of each zone of the screw to reach 210 ℃, keeping the temperature of 210 ℃, and extruding and granulating at the screw rotating speed of 480 revolutions per minute to obtain the modified HDPE composite material for the automobile headrest framework.
Example 5
A modified HDPE composite material for an automobile headrest framework is prepared from the following raw materials in parts by weight:
90 parts of HDPE, 5 parts of POE toughening agent, 5 parts of LLDPE toughening agent, 0.1 part of nucleating agent, 0.15 part of stabilizing agent and 0.5 part of other auxiliary agent (antioxidant).
The preparation method comprises the following steps:
step one, preparing materials: the raw materials are weighed one by one according to the weight ratio of the components for standby.
Step two, premixing: and (2) adding the raw materials weighed in the step one into a high-speed mixer, firstly carrying out hot mixing at 90 ℃ for 5min, then carrying out cold mixing at 20 ℃ for 5min, and standing and curing at room temperature for 1h after the cold mixing is finished to obtain the premix.
Step three, mixing: and (3) putting the premix obtained in the step two into a double-screw extruder, preheating for 5 minutes to enable the temperature of each zone of the screw to reach 210 ℃, keeping the temperature of 210 ℃, and extruding and granulating at the screw rotating speed of 480 revolutions per minute to obtain the modified HDPE composite material for the automobile headrest framework.
Comparative example 1
100 parts of HDPE are weighed according to parts by weight.
Control material 1 was prepared as follows:
(1) putting the weighed HDPE into a feeding machine;
(2) HDPE is fed into a double-screw extruder from a feeding machine, preheated for 5 minutes, extruded and granulated to obtain a reference material 1, wherein the temperature of each zone of the screw is 210 ℃, and the rotating speed of the screw is 480 rpm.
Comparative example 2
100 parts of HDPE and 0.5 part of other auxiliary agents (antioxidants) are weighed according to parts by weight.
Control material 2 was prepared as follows:
(1) putting the weighed HDPE and the antioxidant into a high-speed mixer to be mixed for 10 minutes to obtain a premix, and putting the premix into a feeder;
(2) and feeding the premix into a double-screw extruder from a feeding machine, preheating for 5 minutes, wherein the temperature of each zone of a screw is 210 ℃, the rotating speed of the screw is 480 revolutions per minute, and extruding and granulating to obtain a reference material 2.
Experimental example 1
The materials obtained in examples 1-5 and comparative examples 1-2 were subjected to mechanical property tests, and the test results were as follows:
TABLE 1 summary of the results of the mechanical Property parameter measurements of the materials obtained in examples 1-5 and comparative examples 1-2
As can be seen from Table 1, by analysis of comparative examples 1 and 2, the addition of an antioxidant leads to a loss of the mechanical properties of the HDPE, so that it is necessary to modify it to maintain its mechanical properties after the addition of the antioxidant. As can be seen from comparison of example 1 and comparative example 2, the addition of the nucleating agent and the light stabilizer provides a significant improvement in toughness and impact strength. Comparing examples 1, 2, it was found that the toughening effect of POE is more pronounced than that of the nucleating agent, and that no substantial loss of other mechanical properties results. Comparing examples 3 and 4, it is found that LLDPE has a good compatibility with HDPE and is an ethylene copolymer, but the reinforcing effect is inferior to POE. Compared with the examples 2 and 4, it can be obviously observed that when the toughening agent and the nucleating agent coexist, the toughening effect is better than that when the toughening agent and the nucleating agent exist singly, which shows that the nucleating agent has the effect of promoting POE to exert reinforcing modification, particularly that the induced crystal part has the reinforcing effect on the HDPE base material, and the reinforcing effect is better than the impact resistance loss possibly caused by the light stabilizer, and further shows that the auxiliary agents with different toughening mechanisms have synergistic effect, so that HDPE can be well toughened, and the HDPE material is endowed with better toughness, so that the HDPE material is not easy to embrittle. In comparison with examples 4 and 5, it can be seen that although the modification capability of LLDPE is inferior to that of POE, the addition of LLDPE and POE at the same time further improves the performance of HDPE material, and the toughness is higher and the brittleness is less.
Experimental example 2
The materials obtained in examples 1-5 and comparative examples 1-2 were subjected to an anti-aging test according to the thermo-oxidative aging test standard GB/T7141-2008, and the test results are as follows:
TABLE 2 summary of the aging resistance test results for the materials of examples 1-5 and comparative examples 1-2
As can be seen from Table 2, the addition of the antioxidant can enhance the anti-aging properties of HDPE to some extent as analyzed by comparative examples 1 and 2. Comparing example 1 with comparative example 2, it can be seen that the addition of nucleating agents and light stabilizers can also improve certain aging resistance of HDPE. Comparing examples 2, 3 and 4, it is known that the aging resistance of HDPE can be improved by introducing POE and LLDPE, but obviously, the aging resistance of HDPE is not modified by POE, and the aging resistance of HDPE material is obviously improved after introducing LLDPE modifier into HDPE. Through comparison examples 4, 5, after POE and LLDPE modifier were introduced simultaneously to HDPE, there was further improvement again in HDPE's ageing resistance, showed that POE and LLDPE have certain synergism in the aspect of the ageing resistance from this, can the combined action strengthen the ageing resistance of HDPE material, made the HDPE material more difficult ageing.
In conclusion, the HDPE material can be applied to manufacturing of the automobile headrest framework, and can be used for producing the automobile headrest framework which is non-toxic, strong in mechanical property, anti-aging and anti-embrittlement.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (10)
1. The modified HDPE composite material for the automobile headrest framework is characterized by being prepared from the following raw materials in parts by weight: 80-100 parts of High Density Polyethylene (HDPE), 1-20 parts of toughening agent, 0-0.2 part of nucleating agent, 0.1-0.5 part of light stabilizer and 0.1-1 part of other auxiliary agents.
2. The modified HDPE composite material for the framework of the automobile headrest, as claimed in claim 1, wherein: the HDPE resin is white powder or granular thermoplastic polyolefin generated by ethylene copolymerization, and the molecular weight of the HDPE is in the range of 4-30 ten thousand.
3. The modified HDPE composite material for the automobile headrest framework as claimed in claim 1, wherein: the toughening agent adopts a mixture of an ethylene-octene copolymer toughening agent (POE) and a linear low-density polyethylene toughening agent (LLDPE), wherein the POE: the weight ratio range of LLDPE is 1: (1-5).
4. The modified HDPE composite material for the automobile headrest framework as claimed in claim 1, wherein: the light stabilizer is selected from one or more mixtures of hindered phenolic compounds and hindered amine compounds.
5. The modified HDPE composite material for the automobile headrest framework as claimed in claim 1, wherein: the other auxiliary agents comprise antioxidants, and the antioxidants are compound antioxidants containing free radical scavengers.
6. A method for preparing the modified HDPE composite material used for the automobile headrest framework, which is described in any one of claims 1 to 5, is characterized by comprising the following steps:
step one, preparing materials: weighing the raw materials according to the weight ratio of the formula;
step two, premixing: adding the raw materials weighed in the step one into a high-speed mixer for blending to obtain a premix;
step three, mixing: and D, putting the premix obtained in the step two into a double-screw extruder for mixing, and extruding and granulating to obtain the modified HDPE composite material for the automobile headrest framework.
7. The preparation method of the modified HDPE composite material for the automobile headrest framework as claimed in claim 6, wherein the second step is that the raw materials are firstly hot-mixed and then cold-mixed in a high-speed mixer, the hot-mixing temperature is 90-120 ℃, and the cold-mixing temperature is 20-60 ℃.
8. The preparation method of the modified HDPE composite material for the automobile headrest framework, according to claim 6, is characterized in that: and after blending, the second step needs to be kept stand and cured for 1-3 hours.
9. The preparation method of the modified HDPE composite material for the automobile headrest framework, according to claim 6, is characterized in that: the temperature of each zone of a screw of the double-screw extruder in the third step is 170-230 ℃, and the rotating speed of the screw is 250-600 revolutions per minute.
10. The preparation method of the modified HDPE composite material for the automobile headrest framework, according to claim 6, is characterized in that: in the third step, preheating is needed for 3-5 min before the mixing of the double-screw extruder.
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| CN101948617A (en) * | 2010-10-08 | 2011-01-19 | 苏州旭光聚合物有限公司 | Glass fiber/mineral composite reinforced modified nylon-6 material and preparation method thereof |
| CN103044775A (en) * | 2012-12-26 | 2013-04-17 | 江苏金发科技新材料有限公司 | Glass fiber reinforced polypropylene composite material for car radiator grid and preparation process thereof |
| CN104861287A (en) * | 2015-04-18 | 2015-08-26 | 济源市中原化工有限公司 | Whisker-modifying PP composite material used for automobile meter desk and preparation method thereof |
| CN111448201A (en) * | 2017-07-06 | 2020-07-24 | 巴斯夫欧洲公司 | Stabilized polyolefin compositions comprising benzofuranones and hindered amine light stabilizers |
| WO2022016787A1 (en) * | 2020-07-20 | 2022-01-27 | 金发科技股份有限公司 | Automotive dashboard polypropylene composite material and preparation method therefor |
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- 2022-06-07 CN CN202210634444.5A patent/CN114874528B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101948617A (en) * | 2010-10-08 | 2011-01-19 | 苏州旭光聚合物有限公司 | Glass fiber/mineral composite reinforced modified nylon-6 material and preparation method thereof |
| CN103044775A (en) * | 2012-12-26 | 2013-04-17 | 江苏金发科技新材料有限公司 | Glass fiber reinforced polypropylene composite material for car radiator grid and preparation process thereof |
| CN104861287A (en) * | 2015-04-18 | 2015-08-26 | 济源市中原化工有限公司 | Whisker-modifying PP composite material used for automobile meter desk and preparation method thereof |
| CN111448201A (en) * | 2017-07-06 | 2020-07-24 | 巴斯夫欧洲公司 | Stabilized polyolefin compositions comprising benzofuranones and hindered amine light stabilizers |
| WO2022016787A1 (en) * | 2020-07-20 | 2022-01-27 | 金发科技股份有限公司 | Automotive dashboard polypropylene composite material and preparation method therefor |
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