WO2023024939A1 - Microfoam polypropylene composition, and preparation method therefor and application thereof - Google Patents

Microfoam polypropylene composition, and preparation method therefor and application thereof Download PDF

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WO2023024939A1
WO2023024939A1 PCT/CN2022/112211 CN2022112211W WO2023024939A1 WO 2023024939 A1 WO2023024939 A1 WO 2023024939A1 CN 2022112211 W CN2022112211 W CN 2022112211W WO 2023024939 A1 WO2023024939 A1 WO 2023024939A1
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polypropylene
polypropylene composition
parts
microfoamed
nano
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PCT/CN2022/112211
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French (fr)
Chinese (zh)
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陈嘉杰
陈平绪
叶南飚
俞飞
杨波
吴国峰
罗忠富
陈延安
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金发科技股份有限公司
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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
    • C08J9/08—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 carbon dioxide
    • 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
    • C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
    • 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
    • C08J9/009—Use of pretreated compounding ingredients
    • 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
    • C08J2203/02—CO2-releasing, e.g. NaHCO3 and citric acid
    • 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
    • C08J2205/00—Foams characterised by their properties
    • C08J2205/04—Foams characterised by their properties characterised by the foam pores
    • C08J2205/044—Micropores, i.e. average diameter being between 0,1 micrometer and 0,1 millimeter
    • 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
    • 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
    • C08J2323/10—Homopolymers or copolymers of propene
    • C08J2323/14—Copolymers of propene
    • 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
    • C08J2477/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers

Definitions

  • the invention relates to the technical field of polymer materials, and more specifically, relates to a microfoamed polypropylene composition and a preparation method and application thereof.
  • Polypropylene (PP) material has been widely used in various assembly systems of automobiles due to its good comprehensive performance. Most of the automotive exterior and interior parts are injection molded using polypropylene composite materials. Automotive interior parts such as dashboards, pillars, glove boxes, door panels, etc., exterior parts such as bumpers, anti-scratch strips, spoilers, etc.
  • Microfoaming refers to the thermoplastic material as the matrix, and the middle layer of the product is densely covered with closed micropores with a size ranging from ten to tens of microns.
  • Micro-foaming injection molding technology has broken through many limitations of traditional injection molding. On the basis of basically ensuring the performance of the product, it can significantly reduce the weight and shorten the molding cycle, and has the advantages of small internal stress and warpage, high straightness, stable size, The large molding window and other characteristics, especially in the production of high-precision and high-end products, compared with conventional injection molding, have become an important direction for the development of injection molding technology in recent years.
  • polypropylene chemical micro-foaming material which has the characteristics of light weight, high specific strength, sound insulation, heat insulation, etc., and is different from unfoamed polypropylene.
  • expanded polypropylene products can not only significantly reduce the weight of the part, shorten the molding cycle, reduce the amount of material used, save costs, but also eliminate sink marks, and improve the warping deformation and dimensional stability of the part.
  • micro-foamed polypropylene material also has the disadvantage of poor mechanical properties. Due to the low melt strength of polypropylene, generally only 20-35cN, for micro-foamed polypropylene materials with uneven cell distribution, the unevenly distributed cells will become the source of cracks during the stress process, affecting Mechanical properties of foamed materials.
  • the improvement of the above-mentioned defects is generally carried out from two aspects: (1) improving the foaming state to make the cell distribution more uniform; (2) adding high-melt-strength polymers or elastomers by blending , to increase the melt strength of the polypropylene substrate, thereby improving the mechanical properties of the foamed material.
  • Chinese patent application CN102115561A discloses a method for physically foaming polypropylene sheets, which uses high-melt strength polypropylene and adds nucleating agents and bubble stabilizers and other auxiliary agents;
  • Chinese patent application CN108059771A discloses a method with High melt strength polypropylene micro-foaming material, which improves the melt strength of the micro-foaming material by blending high melt strength ethylene-methacrylic acid ionomer resin.
  • the present invention provides a micro-foamed polypropylene composition, which has high mechanical strength at low temperatures and can be used at -30°C.
  • Another object of the present invention is to provide a preparation method of the above-mentioned microfoamed polypropylene composition.
  • Another object of the present invention is to provide the application of the micro-foamed polypropylene composition in the preparation of automotive interior parts.
  • a micro-foaming polypropylene composition comprising a polypropylene composite material and a blowing agent;
  • the polypropylene composite material comprises the following components by weight:
  • the melt flow rate of the polypropylene resin is 1.8-5.0g/10min under the conditions of 230°C and 2.16kg;
  • the melting point of the polyamide resin is 155-210°C
  • the nanometer metal oxide is treated with a cationic surfactant.
  • the detection method of the melt flow rate of described polypropylene resin is GB/T 3682-2000.
  • the detection method of the fusing point of described polyamide resin is HG/T 2235-1991.
  • the micro-foamed polypropylene composition of the present invention comprises a polypropylene composite material and a foaming agent.
  • the polypropylene composite material uses polypropylene resin as the matrix resin, blended with polyamide resin with a melting point of 155-210°C, and the melt strength of polyamide is generally more than twice that of polypropylene. body strength, thereby improving the melt strength of the PP/PA system of the present invention.
  • the melting point of polyamide resin is relatively high.
  • the melting point of PA commonly used in the market is generally above 215°C, such as the melting point of PA6 is 215-225°C, and the melting point of PA66 is 250-260°C.
  • PA with a higher melting point is blended with PP with a melting point of about 189°C, the mechanical properties of PP will be greatly reduced due to the need for higher processing temperature and greater shear force.
  • the inventors have found that by selecting a specific polyamide resin with a low melting point, the defect of difficulty in blending PP and PA can be overcome, so as to improve the mechanical properties of the microfoamed polypropylene composition of the present invention.
  • Nano-metal oxides can act as a foaming skeleton in the micro-foaming material, which helps to form more uniform cells. Moreover, since the catalyst used in the synthesis of PA usually contains chloride ions, when PP and PA are blended and processed, the residual chloride ions in PA are easy to form HCl, resulting in the degradation of PP, thereby reducing the mechanical properties of the PP/PA matrix. The addition of nano-metal oxides can inhibit this degradation, and play the role of acid absorption during processing, so that the mechanical properties of PP and PA are not affected after blending.
  • the nano-metal oxides are treated with cationic surfactants, they have better dispersion and compatibility in the PP/PA matrix, and more uniform distribution in the polypropylene composite material, making the mechanical properties of each position in the micro-foamed polypropylene composition The strength is more even, and the cell formation is more uniform, which in turn greatly improves the impact resistance at low temperature.
  • the micro-foamed polypropylene composition consists of 94-98 wt.% polypropylene composite material and 2-6 wt.% foaming agent.
  • the polypropylene resin is copolymerized polypropylene and/or homopolymerized polypropylene.
  • the polyamide resin has a melting point of 170-185°C.
  • the polyamide resin is one or more of PA6/PA66/PA610 copolyamide, PA6/PA6/PA1010 copolyamide, PA6/PA66/PA1010 copolyamide or PA6/PA66 copolyamide.
  • the average particle diameter of the nano metal oxide is 50-200nm
  • the average particle size of the nano-metal oxide is 60-80 nm.
  • the method of treating the nanometer metal oxide with a cationic surfactant is:
  • the nano-metal oxide is nano-magnesium oxide and/or nano-zinc oxide.
  • the cationic surfactant is one or more of ammonium polycarboxylate, ammonium acetate or triammonium citrate.
  • the crosslinking agent is a peroxide crosslinking agent.
  • the crosslinking agent is one or more of dicumyl peroxide, phenylacetyl peroxide, di-tert-butyl peroxide or dicumyl hydroperoxide.
  • the compatibilizer is grafted maleic anhydride polypropylene and/or grafted maleic anhydride polyethylene.
  • the blowing agent is a chemical blowing agent.
  • the chemical blowing agent has a core-shell structure, the shell is LDPE, and the core is sodium bicarbonate.
  • the melt flow rate of the LDPE is 0.5-3 g/10 min under the conditions of 190° C. and 2.16 kg.
  • the other auxiliary agents include one or more of crosslinking auxiliary agents, heat stabilizers, light stabilizers or ultraviolet absorbers.
  • the crosslinking aid is divinylbenzene.
  • the heat stabilizer is one or more of phenol, phosphite, and thioester heat stabilizers.
  • the light stabilizer is a hindered amine light stabilizer.
  • the ultraviolet absorber is a benzophenone ultraviolet absorber and/or a benzotriazole ultraviolet absorber.
  • the micro-foamed polypropylene composition has more excellent low-temperature impact resistance.
  • the present invention also protects the preparation method of the microfoamed polypropylene composition, comprising the following steps:
  • step S2 Mixing the polypropylene composite material prepared in step S1 with a foaming agent, and performing secondary mold opening and injection molding to obtain the microfoamed polypropylene composition.
  • the extruder is a twin-screw extruder, wherein the extrusion temperature is 180-230° C., and the screw speed is 400-450 rpm.
  • the mixing temperature in step S1 is 30-60°C.
  • the injection molding temperature in step S2 is 190-220°C.
  • the present invention also protects the application of the micro-foamed polypropylene composition in the preparation of automotive interior parts.
  • the invention develops a micro-foaming polypropylene composition with excellent mechanical properties at low temperature.
  • a small amount of polyamide resin with low melting point in polypropylene resin and synergizing with nanometer metal oxide treated with cationic surfactant the mechanical properties of micro-foamed polypropylene composition are effectively improved.
  • the notched Izod impact strength of the microfoamed polypropylene composition of the present invention is ⁇ 7.7 kJ/m 2 .
  • the raw material in embodiment and comparative example all can be obtained by commercially available;
  • the reagents, methods and equipment used in the present invention are conventional reagents, methods and equipment in the technical field.
  • nanometer metal oxide is treated with a cationic surfactant, and the treatment method is:
  • blend nano-metal oxides and cationic surfactants at a weight percentage of 1:0.02 and stir for 3 minutes;
  • the extrusion temperature of the twin-screw extruder is 180-230° C.
  • the screw speed is 400-450 rpm
  • the injection molding temperature is 190-220° C.
  • the test method is as follows:
  • Tensile strength tested according to ISO 527-2-2016, the tensile speed is 50mm/min, the unit is MPa;
  • Flexural modulus tested according to ISO-178-2010, the test speed is 50mm/min, the unit is MPa;
  • Low temperature cantilever impact strength tested according to ISO 180-2019 standard, the test condition is -30°C, and the unit is kJ/m 2 .
  • the apparent density of the micro-foamed polypropylene composition of each embodiment of the present invention is 0.72-0.795 g/cm 3 , that is, it has a micro-foaming effect; the tensile strength and flexural modulus are high, and Notched Izod impact strength at -30°C is ⁇ 7.7kJ/m 2 , and has excellent mechanical properties at low temperatures.
  • the nano-metal oxide used in Comparative Example 4 was not treated with a surfactant, and the Nano-metal oxide was not contained in Comparative Example 5.
  • the low-temperature Izod impact strength of the micro-foamed polypropylene composition obtained was respectively 5.7kJ/m 2. 6.8kJ/m 2 , which cannot meet the actual use requirements of low temperature and high impact resistance.
  • the content of nanometer metal oxide is too much, so that the apparent density of the microfoamed polypropylene composition is too high, and the low-temperature Izod notched impact strength is low, which is 6.9 kJ/m 2 .
  • no polyamide resin was contained, and the micro-foamed polypropylene composition obtained had extremely low tensile strength and low-temperature Izod impact strength, and poor mechanical properties.

Abstract

Disclosed in the present invention are a microfoam polypropylene composition, and a preparation method therefor and an application thereof. The microfoam polypropylene composition consists of a polypropylene composite material and a foaming agent; the polypropylene composite material comprises the following components in parts by weight: 76-86 parts of polypropylene resin, 5-10 parts of polyamide resin, 2-8 parts of a crosslinking agent, 5-20 parts of nano-metal oxide, 3-8 parts of a compatibilizer, and 0-2 parts of other additives; the melt flow rate of the polypropylene resin is 1.8-5.0 g/10 min under the conditions of 230°C and 2.16 kg; the melting point of the polyamide resin is 155-210°C; the nano-metal oxide is treated with a cationic surfactant. By blending a small amount of polyamide resin having a low melting point in the polypropylene resin and synergizing with the nano-oxide treated with the cationic surfactant, the mechanical properties of the microfoam polypropylene composition are effectively improved, so that the notched izod impact strength of the polypropylene composition at -30°C is greater than or equal to 7.7 kJ/m2.

Description

一种微发泡聚丙烯组合物及其制备方法和应用A kind of microfoaming polypropylene composition and its preparation method and application 技术领域technical field
本发明涉及高分子材料技术领域，更具体的，涉及一种微发泡聚丙烯组合物及其制备方法和应用。The invention relates to the technical field of polymer materials, and more specifically, relates to a microfoamed polypropylene composition and a preparation method and application thereof.
背景技术Background technique
聚丙烯(PP)材料由于其良好的综合性能，在汽车各大总成***中获得了广泛应用。汽车外饰件与内饰件大多使用聚丙烯复合材料注塑成型。汽车内饰件如仪表板、立柱、杂物箱、门板等，外饰件如保险杠、防擦条、扰流板等。Polypropylene (PP) material has been widely used in various assembly systems of automobiles due to its good comprehensive performance. Most of the automotive exterior and interior parts are injection molded using polypropylene composite materials. Automotive interior parts such as dashboards, pillars, glove boxes, door panels, etc., exterior parts such as bumpers, anti-scratch strips, spoilers, etc.
微发泡是指以热塑性材料为基体，制品中间层密布尺寸从十到几十微米的封闭微孔。微发泡注塑成型技术突破了传统注塑的诸多局限，在基本保证制品性能的基础上，可以明显减轻重量和缩短成型的周期，并具有内应力和翘曲小、平直度高、尺寸稳定、成型视窗大等特点，特别是在生产高精密和高档制品上与常规注塑相比较独具优势，成为近年来注塑技术发展的一个重要方向。Microfoaming refers to the thermoplastic material as the matrix, and the middle layer of the product is densely covered with closed micropores with a size ranging from ten to tens of microns. Micro-foaming injection molding technology has broken through many limitations of traditional injection molding. On the basis of basically ensuring the performance of the product, it can significantly reduce the weight and shorten the molding cycle, and has the advantages of small internal stress and warpage, high straightness, stable size, The large molding window and other characteristics, especially in the production of high-precision and high-end products, compared with conventional injection molding, have become an important direction for the development of injection molding technology in recent years.
采用注塑成型工艺在聚丙烯材料中引入几十微米到几百微米尺寸的泡孔得到聚丙烯化学微发泡材料，具有质轻、比强度高，隔音，隔热等特点，与未发泡聚丙烯相比，发泡聚丙烯产品不仅能显著降低制件重量，缩短成型周期，降低材料用量、节省成本，还能消除缩痕，改善制件的翘曲变形和尺寸稳定性。Using injection molding technology to introduce cells with a size of tens of microns to hundreds of microns into polypropylene material to obtain polypropylene chemical micro-foaming material, which has the characteristics of light weight, high specific strength, sound insulation, heat insulation, etc., and is different from unfoamed polypropylene. Compared with propylene, expanded polypropylene products can not only significantly reduce the weight of the part, shorten the molding cycle, reduce the amount of material used, save costs, but also eliminate sink marks, and improve the warping deformation and dimensional stability of the part.
但微发泡聚丙烯材料也具有力学性能较差的缺陷。由于聚丙烯的熔体强度低，一般仅为20～35cN，对于泡孔分布不均的微发泡聚丙烯材料，在受力过程中，分布不均的泡孔会成为裂纹的发源地，影响发泡材料的力学性能。However, the micro-foamed polypropylene material also has the disadvantage of poor mechanical properties. Due to the low melt strength of polypropylene, generally only 20-35cN, for micro-foamed polypropylene materials with uneven cell distribution, the unevenly distributed cells will become the source of cracks during the stress process, affecting Mechanical properties of foamed materials.
现有技术中，对于上述缺陷的改善一般是从两个方面进行：(1)改善发泡状态，使得泡孔分布更均一；(2)通过共混添加高熔体强度的聚合物或弹性体，以提高聚丙烯基材的熔体强度，进而改善发泡材料的力学性能。In the prior art, the improvement of the above-mentioned defects is generally carried out from two aspects: (1) improving the foaming state to make the cell distribution more uniform; (2) adding high-melt-strength polymers or elastomers by blending , to increase the melt strength of the polypropylene substrate, thereby improving the mechanical properties of the foamed material.
例如中国专利申请CN102115561A公开了一种物理发泡聚丙烯片材的方法，该方法采用高熔体强度聚丙烯，添加成核剂和气泡稳定剂等助剂；中国专利申请CN108059771A公开了一种具有高熔体强度聚丙烯微发泡材料，该材料通过共混高熔体强度的乙烯-甲基丙烯酸离子键聚合物树脂以提高微发泡材料的熔体强度。For example, Chinese patent application CN102115561A discloses a method for physically foaming polypropylene sheets, which uses high-melt strength polypropylene and adds nucleating agents and bubble stabilizers and other auxiliary agents; Chinese patent application CN108059771A discloses a method with High melt strength polypropylene micro-foaming material, which improves the melt strength of the micro-foaming material by blending high melt strength ethylene-methacrylic acid ionomer resin.
然而，共混添加高熔体强度的聚合物后，聚丙烯微发泡材料的力学性能与传统的未发泡聚丙烯材料相比，依旧有较大差距，特别是在低温下的抗冲击性能， 现有技术CN108059771A报道该聚丙烯微发泡材料在-30℃下悬梁臂缺口冲击强度最高仅能达到6.5kJ/m 2，难以满足实际需求。 However, after blending and adding high melt strength polymers, the mechanical properties of polypropylene microfoamed materials still have a large gap compared with traditional unfoamed polypropylene materials, especially the impact resistance at low temperature , The prior art CN108059771A reports that the notched cantilever impact strength of the polypropylene microfoam material at -30°C can only reach 6.5kJ/m 2 , which is difficult to meet the actual demand.
因此，需要开发出一种低温下力学性能优异的微发泡聚丙烯组合物。Therefore, it is necessary to develop a microfoamed polypropylene composition with excellent mechanical properties at low temperature.
发明内容Contents of the invention
本发明为克服上述现有技术所述的低温下力学性能差的缺陷，提供一种微发泡聚丙烯组合物，该微发泡聚丙烯组合物在低温下力学强度高，在-30℃条件下悬梁臂缺口冲击强度≥7.7kJ/m 2。 In order to overcome the defects of poor mechanical properties at low temperatures described in the prior art, the present invention provides a micro-foamed polypropylene composition, which has high mechanical strength at low temperatures and can be used at -30°C. Lower cantilever arm notched impact strength ≥ 7.7kJ/m 2 .
本发明的另一目的在于提供上述微发泡聚丙烯组合物的制备方法。Another object of the present invention is to provide a preparation method of the above-mentioned microfoamed polypropylene composition.
本发明的另一目的在于提供上述微发泡聚丙烯组合物在制备汽车内饰件中的应用。Another object of the present invention is to provide the application of the micro-foamed polypropylene composition in the preparation of automotive interior parts.
为解决上述技术问题，本发明采用的技术方案是：In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:
一种微发泡聚丙烯组合物，所述微发泡聚丙烯组合物包括聚丙烯复合材料与发泡剂；A micro-foaming polypropylene composition, said micro-foaming polypropylene composition comprising a polypropylene composite material and a blowing agent;
所述聚丙烯复合材料包括如下重量份的组分：The polypropylene composite material comprises the following components by weight:
聚丙烯树脂(PP)76～86份，76-86 parts of polypropylene resin (PP),
聚酰胺树脂(PA)5～10份，5-10 parts of polyamide resin (PA),
交联剂2～8份，2 to 8 parts of crosslinking agent,
纳米金属氧化物5～20份，5-20 parts of nano metal oxides,
相容剂3～8份，3-8 parts of compatibilizer,
其他助剂0～2份，0-2 parts of other additives,
所述聚丙烯树脂在230℃、2.16kg条件下，熔体流动速率为1.8～5.0g/10min；The melt flow rate of the polypropylene resin is 1.8-5.0g/10min under the conditions of 230°C and 2.16kg;
所述聚酰胺树脂的熔点为155～210℃，The melting point of the polyamide resin is 155-210°C,
所述纳米金属氧化物经阳离子表面活性剂处理。The nanometer metal oxide is treated with a cationic surfactant.
所述聚丙烯树脂的熔体流动速率的检测方法为GB/T 3682-2000。所述聚酰胺树脂的熔点的检测方法为HG/T 2235-1991。The detection method of the melt flow rate of described polypropylene resin is GB/T 3682-2000. The detection method of the fusing point of described polyamide resin is HG/T 2235-1991.
本发明的微发泡聚丙烯组合物，包括聚丙烯复合材料与发泡剂。其中聚丙烯复合材料以聚丙烯树脂为基体树脂，共混添加了熔点为155～210℃的聚酰胺树脂，聚酰胺的熔体强度一般为聚丙烯的两倍以上，利用聚酰胺自身的高熔体强度，进而提高了本发明PP/PA体系的熔体强度。The micro-foamed polypropylene composition of the present invention comprises a polypropylene composite material and a foaming agent. Among them, the polypropylene composite material uses polypropylene resin as the matrix resin, blended with polyamide resin with a melting point of 155-210°C, and the melt strength of polyamide is generally more than twice that of polypropylene. body strength, thereby improving the melt strength of the PP/PA system of the present invention.
聚酰胺树脂的熔点较高，市面上常用的PA熔点一般为215℃以上，如PA6 熔点为215～225℃，PA66熔点为250～260℃。而熔点较高的PA与熔点为189℃左右的PP共混时，由于需要较高的加工温度，较大的剪切力，会使得PP的力学性能大幅下降。发明人研究发现，通过选用特定的低熔点聚酰胺树脂，能够克服PP与PA共混加工困难的缺陷，以提高本发明微发泡聚丙烯组合物的力学性能。The melting point of polyamide resin is relatively high. The melting point of PA commonly used in the market is generally above 215°C, such as the melting point of PA6 is 215-225°C, and the melting point of PA66 is 250-260°C. When PA with a higher melting point is blended with PP with a melting point of about 189°C, the mechanical properties of PP will be greatly reduced due to the need for higher processing temperature and greater shear force. The inventors have found that by selecting a specific polyamide resin with a low melting point, the defect of difficulty in blending PP and PA can be overcome, so as to improve the mechanical properties of the microfoamed polypropylene composition of the present invention.
纳米金属氧化物在微发泡材料中能够起到发泡骨架的作用，有助于泡孔成型更均匀。并且，由于PA合成时使用的催化剂通常含有氯离子，PP与PA共混加工时，PA中残存的氯离子易形成HCl，造成PP的降解，从而使得PP/PA基体的力学性能下降。而纳米金属氧化物的加入能够抑制该降解，在加工过程中起到吸酸的作用，使得PP与PA共混后力学性能不受影响。Nano-metal oxides can act as a foaming skeleton in the micro-foaming material, which helps to form more uniform cells. Moreover, since the catalyst used in the synthesis of PA usually contains chloride ions, when PP and PA are blended and processed, the residual chloride ions in PA are easy to form HCl, resulting in the degradation of PP, thereby reducing the mechanical properties of the PP/PA matrix. The addition of nano-metal oxides can inhibit this degradation, and play the role of acid absorption during processing, so that the mechanical properties of PP and PA are not affected after blending.
纳米金属氧化物经阳离子表面活性剂处理后，在PP/PA基体中分散性、相容性更优，在聚丙烯复合材料中分布更均一，使得微发泡聚丙烯组合物中各个位置的力学强度更平均，且泡孔成型更均一，进而大幅度提高了低温下的抗冲击性能。After the nano-metal oxides are treated with cationic surfactants, they have better dispersion and compatibility in the PP/PA matrix, and more uniform distribution in the polypropylene composite material, making the mechanical properties of each position in the micro-foamed polypropylene composition The strength is more even, and the cell formation is more uniform, which in turn greatly improves the impact resistance at low temperature.
优选地，所述微发泡聚丙烯组合物由94～98wt.％聚丙烯复合材料与2～6wt.％发泡剂组成。Preferably, the micro-foamed polypropylene composition consists of 94-98 wt.% polypropylene composite material and 2-6 wt.% foaming agent.
优选地，所述聚丙烯树脂为共聚聚丙烯和/或均聚聚丙烯。Preferably, the polypropylene resin is copolymerized polypropylene and/or homopolymerized polypropylene.
优选地，所述聚酰胺树脂的熔点为170～185℃。Preferably, the polyamide resin has a melting point of 170-185°C.
优选地，所述聚酰胺树脂为PA6/PA66/PA610共聚聚酰胺、PA6/PA6/PA1010共聚聚酰胺、PA6/PA66/PA1010共聚聚酰胺或PA6/PA66共聚聚酰胺中的一种或几种。Preferably, the polyamide resin is one or more of PA6/PA66/PA610 copolyamide, PA6/PA6/PA1010 copolyamide, PA6/PA66/PA1010 copolyamide or PA6/PA66 copolyamide.
优选地，所述纳米金属氧化物的平均粒径为50～200nmPreferably, the average particle diameter of the nano metal oxide is 50-200nm
更优选地，所述纳米金属氧化物的平均粒径为60～80nm。More preferably, the average particle size of the nano-metal oxide is 60-80 nm.
优选地，所述纳米金属氧化物经阳离子表面活性剂处理的方法为：Preferably, the method of treating the nanometer metal oxide with a cationic surfactant is:
在45～55℃下，将纳米金属氧化物与阳离子表面活性剂按照重量百分比1:(0.01～0.05)共混后搅拌2～4分钟。At 45-55°C, blend the nanometer metal oxide and the cationic surfactant according to weight percentage 1:(0.01-0.05) and stir for 2-4 minutes.
优选地，所述纳米金属氧化物为纳米氧化镁和/或纳米氧化锌。Preferably, the nano-metal oxide is nano-magnesium oxide and/or nano-zinc oxide.
优选地，所述阳离子表面活性剂为聚羧酸铵、乙酸铵或柠檬酸三铵中一种或几种。Preferably, the cationic surfactant is one or more of ammonium polycarboxylate, ammonium acetate or triammonium citrate.
优选地，所述交联剂为过氧化物类交联剂。Preferably, the crosslinking agent is a peroxide crosslinking agent.
可选的，所述交联剂为过氧化二异丙苯、过氧化苯乙酰、二叔丁基过氧化物 或过氧化氢二异丙苯中的一种或几种。Optionally, the crosslinking agent is one or more of dicumyl peroxide, phenylacetyl peroxide, di-tert-butyl peroxide or dicumyl hydroperoxide.
优选地，所述相容剂为接枝马来酸酐聚丙烯和/或接枝马来酸酐聚乙烯。Preferably, the compatibilizer is grafted maleic anhydride polypropylene and/or grafted maleic anhydride polyethylene.
优选地，所述发泡剂为化学发泡剂。Preferably, the blowing agent is a chemical blowing agent.
优选地，所述化学发泡剂具有核-壳结构，壳为LDPE，核为碳酸氢钠。Preferably, the chemical blowing agent has a core-shell structure, the shell is LDPE, and the core is sodium bicarbonate.
更优选地，所述LDPE的熔体流动速率在190℃、2.16kg条件下为0.5～3g/10min。More preferably, the melt flow rate of the LDPE is 0.5-3 g/10 min under the conditions of 190° C. and 2.16 kg.
优选地，所述其他助剂包括交联助剂、热稳定剂、光稳定剂或紫外线吸收剂中一种或几种。Preferably, the other auxiliary agents include one or more of crosslinking auxiliary agents, heat stabilizers, light stabilizers or ultraviolet absorbers.
优选地，所述交联助剂为二乙烯基苯。Preferably, the crosslinking aid is divinylbenzene.
所述热稳定剂为酚类、亚磷酸酯类、硫代酯类热稳定剂中的一种或几种。The heat stabilizer is one or more of phenol, phosphite, and thioester heat stabilizers.
优选地，所述光稳定剂为受阻胺类光稳定剂。Preferably, the light stabilizer is a hindered amine light stabilizer.
优选地，所述紫外线吸收剂为二苯甲酮类紫外线吸收剂和/或苯并***类紫外线吸收剂。Preferably, the ultraviolet absorber is a benzophenone ultraviolet absorber and/or a benzotriazole ultraviolet absorber.
在上述重量范围内，所述微发泡聚丙烯组合物具有更优异的低温抗冲击性能。Within the above weight range, the micro-foamed polypropylene composition has more excellent low-temperature impact resistance.
本发明还保护上述微发泡聚丙烯组合物的制备方法，包括如下步骤：The present invention also protects the preparation method of the microfoamed polypropylene composition, comprising the following steps:
S1.将聚丙烯树脂、聚酰胺树脂、交联剂、纳米金属氧化物、相容剂、其他助剂混合均匀后，加至挤出其中，经熔融、挤出造粒，得到所述聚丙烯复合材料；S1. After mixing polypropylene resin, polyamide resin, crosslinking agent, nanometer metal oxide, compatibilizer and other additives uniformly, add them to extrusion, melt and extrude granulation to obtain the polypropylene composite materials;
S2.将步骤S1制得的聚丙烯复合材料与发泡剂混合，经二次开模注塑成型得到所述微发泡聚丙烯组合物。S2. Mixing the polypropylene composite material prepared in step S1 with a foaming agent, and performing secondary mold opening and injection molding to obtain the microfoamed polypropylene composition.
优选地，所述挤出机为双螺杆挤出机，其中挤出温度为180～230℃，螺杆转速为400～450转/分钟。Preferably, the extruder is a twin-screw extruder, wherein the extrusion temperature is 180-230° C., and the screw speed is 400-450 rpm.
优选地，步骤S1中所述混合的温度为30～60℃。Preferably, the mixing temperature in step S1 is 30-60°C.
优选地，步骤S2中所述注塑成型的温度为190～220℃。Preferably, the injection molding temperature in step S2 is 190-220°C.
本发明还保护上述微发泡聚丙烯组合物在制备汽车内饰件中的应用。The present invention also protects the application of the micro-foamed polypropylene composition in the preparation of automotive interior parts.
与现有技术相比，本发明的有益效果是：Compared with prior art, the beneficial effect of the present invention is:
本发明开发出了一种低温下力学性能优异的微发泡聚丙烯组合物。通过在聚丙烯树脂中共混少量低熔点的聚酰胺树脂，并与经阳离子表面活性剂处理的纳米金属氧化物协同作用，有效提高了微发泡聚丙烯组合物的力学性能，在-30℃条件下本发明的微发泡聚丙烯组合物的悬梁臂缺口冲击强度≥7.7kJ/m 2。 The invention develops a micro-foaming polypropylene composition with excellent mechanical properties at low temperature. By blending a small amount of polyamide resin with low melting point in polypropylene resin and synergizing with nanometer metal oxide treated with cationic surfactant, the mechanical properties of micro-foamed polypropylene composition are effectively improved. The notched Izod impact strength of the microfoamed polypropylene composition of the present invention is ≥7.7 kJ/m 2 .
具体实施方式Detailed ways
下面结合具体实施方式对本发明作进一步的说明。The present invention will be further described below in combination with specific embodiments.
实施例及对比例中的原料均可通过市售得到；The raw material in embodiment and comparative example all can be obtained by commercially available;
Figure PCTCN2022112211-appb-000001
Figure PCTCN2022112211-appb-000001
Figure PCTCN2022112211-appb-000002
Figure PCTCN2022112211-appb-000002
除非特别说明，本发明采用的试剂、方法和设备为本技术领域常规试剂、方法和设备。Unless otherwise specified, the reagents, methods and equipment used in the present invention are conventional reagents, methods and equipment in the technical field.
实施例1～23Examples 1-23
实施例1～23的微发泡聚丙烯组合物中各组分含量如表1所示。The content of each component in the micro-foamed polypropylene composition of Examples 1-23 is shown in Table 1.
其制备方法为：Its preparation method is:
S1.根据表1将PP、PA、交联剂、纳米金属氧化物、相容剂、其他助剂(如有)在50℃下混合均匀后，加至双螺杆挤出机中，经熔融、挤出造粒，得到所述聚丙烯复合材料；S1. According to Table 1, mix PP, PA, cross-linking agent, nano-metal oxide, compatibilizer, and other additives (if any) at 50°C evenly, then add them to the twin-screw extruder, melt, Extruding and granulating to obtain the polypropylene composite material;
其中纳米金属氧化物经阳离子表面活性剂处理，处理方法为：Wherein the nanometer metal oxide is treated with a cationic surfactant, and the treatment method is:
在45～55℃下，将纳米金属氧化物与阳离子表面活性剂按照重量百分比1:0.02共混后搅拌3min；At 45-55°C, blend nano-metal oxides and cationic surfactants at a weight percentage of 1:0.02 and stir for 3 minutes;
S2.将步骤S1制得的聚丙烯复合材料98wt.％与发泡剂2wt.％混合，经二次开模注塑成型得到所述微发泡聚丙烯组合物；S2. Mix 98wt.% of the polypropylene composite material prepared in step S1 with 2wt.% of the foaming agent, and obtain the microfoamed polypropylene composition through secondary mold opening and injection molding;
其中双螺杆挤出机的挤出温度为180～230℃，螺杆转速为400～450转/分钟；注塑成型的温度为190～220℃。Wherein the extrusion temperature of the twin-screw extruder is 180-230° C., the screw speed is 400-450 rpm; the injection molding temperature is 190-220° C.
表1实施例1～23的微发泡聚丙烯组合物中各组分含量Contents of each component in the microfoamed polypropylene composition of Table 1 Examples 1 to 23
Figure PCTCN2022112211-appb-000003
Figure PCTCN2022112211-appb-000003
Figure PCTCN2022112211-appb-000004
Figure PCTCN2022112211-appb-000004
Figure PCTCN2022112211-appb-000005
Figure PCTCN2022112211-appb-000005
对比例1～7Comparative example 1～7
对比例1～7的微发泡聚丙烯组合物中各组分含量如表2所示。The content of each component in the micro-foamed polypropylene composition of Comparative Examples 1-7 is shown in Table 2.
对比例1～2和4～7的制备方法与实施例1～23相同，The preparation method of comparative examples 1～2 and 4～7 is identical with embodiment 1～23,
对比例3的制备方法与实施例1～23的区别在于，双螺杆挤出机的挤出温度为260～280℃。The difference between the preparation method of Comparative Example 3 and Examples 1-23 is that the extrusion temperature of the twin-screw extruder is 260-280°C.
表2对比例1～7的微发泡聚丙烯组合物中各组分含量Contents of each component in the microfoamed polypropylene composition of Table 2 Comparative Examples 1 to 7
Figure PCTCN2022112211-appb-000006
Figure PCTCN2022112211-appb-000006
性能测试Performance Testing
对上述实施例及对比例制备的微发泡聚丙烯组合物进行性能测试。Performance tests were performed on the microfoamed polypropylene compositions prepared in the above examples and comparative examples.
测试方法具体如下：The test method is as follows:
表观密度：按照ISO 1183-2019标准进行测试，单位为g/cm 3； Apparent density: tested according to the ISO 1183-2019 standard, the unit is g/cm 3 ;
拉伸强度：按照ISO 527-2-2016进行测试，拉伸速度为50mm/min，单位为MPa；Tensile strength: tested according to ISO 527-2-2016, the tensile speed is 50mm/min, the unit is MPa;
弯曲模量：按照ISO-178-2010进行测试，试验速度为50mm/min，单位为MPa；Flexural modulus: tested according to ISO-178-2010, the test speed is 50mm/min, the unit is MPa;
低温悬梁臂冲击强度：按照ISO 180-2019标准进行测试，测试条件为-30℃，单位为kJ/m 2。 Low temperature cantilever impact strength: tested according to ISO 180-2019 standard, the test condition is -30°C, and the unit is kJ/m 2 .
实施例及对比例的测试结果见表3和表4。The test results of Examples and Comparative Examples are shown in Table 3 and Table 4.
表3实施例1～23的测试结果The test result of table 3 embodiment 1～23
Figure PCTCN2022112211-appb-000007
Figure PCTCN2022112211-appb-000007
Figure PCTCN2022112211-appb-000008
Figure PCTCN2022112211-appb-000008
Figure PCTCN2022112211-appb-000009
Figure PCTCN2022112211-appb-000009
Figure PCTCN2022112211-appb-000010
Figure PCTCN2022112211-appb-000010
表4对比例1～7的测试结果The test result of table 4 comparative example 1～7
Figure PCTCN2022112211-appb-000011
Figure PCTCN2022112211-appb-000011
根据表3的测试结果，本发明各实施例的微发泡聚丙烯组合物的表观密度为0.72～0.795g/cm 3，即具有微发泡效果；拉伸强度和弯曲模量高，且-30℃下悬梁臂缺口冲击强度≥7.7kJ/m 2，在低温下具有优异的力学性能。 According to the test results in Table 3, the apparent density of the micro-foamed polypropylene composition of each embodiment of the present invention is 0.72-0.795 g/cm 3 , that is, it has a micro-foaming effect; the tensile strength and flexural modulus are high, and Notched Izod impact strength at -30°C is ≥7.7kJ/m 2 , and has excellent mechanical properties at low temperatures.
由实施例1、4、6、7，聚酰胺的熔点为170～185℃时，微发泡聚丙烯组合物低温悬梁臂冲击强度更高。由实施例1、10、11、14、15，纳米金属氧化物的平均粒径为60～80nm时，在-30℃的悬梁臂冲击强度更高，说明低温抗冲击性能更好。由实施例1、实施例18～20，随着纳米金属氧化物的含量增加，制得的微发泡聚丙烯组合物的密度逐渐变大，发泡程度逐渐变弱，纳米金属氧化物的含量为10～15重量份时，微发泡聚丙烯组合物的力学性能更优From Examples 1, 4, 6, and 7, when the melting point of polyamide is 170-185° C., the low-temperature Izod impact strength of the microfoamed polypropylene composition is higher. From Examples 1, 10, 11, 14, and 15, when the average particle size of the nanometer metal oxide is 60-80nm, the Izod impact strength at -30°C is higher, indicating better low-temperature impact resistance. From Example 1 and Examples 18 to 20, as the content of nano-metal oxides increases, the density of the prepared microfoamed polypropylene composition gradually increases, the degree of foaming gradually becomes weaker, and the content of nano-metal oxides When it is 10 to 15 parts by weight, the mechanical properties of the microfoamed polypropylene composition are better
根据表4的测试结果，对比例1、2中PP的熔体流动速率过高或过低时，无法与PA良好相容，使得PP/PA体系力学性能差，微发泡聚丙烯组合物的低温下悬梁臂冲击强度较差。对比例3中使用的PA熔点过高，无法在180～230℃的加 工温度下加工，必须使用更高的加工温度；在260～280℃的加工温度下，PP自身力学性能大幅下降，也使得微发泡聚丙烯组合物的拉伸强度、弯曲模量和低温悬梁臂冲击强度都较差。According to the test results in Table 4, when the melt flow rate of PP in Comparative Examples 1 and 2 is too high or too low, it cannot be well compatible with PA, so that the mechanical properties of the PP/PA system are poor, and the microfoamed polypropylene composition Izod impact strength is poor at low temperature. The melting point of PA used in Comparative Example 3 is too high to be processed at a processing temperature of 180-230°C, and a higher processing temperature must be used; at a processing temperature of 260-280°C, the mechanical properties of PP itself are greatly reduced, which also makes Microcellular polypropylene compositions are inferior in tensile strength, flexural modulus and low temperature Izod impact strength.
对比例4中使用的纳米金属氧化物不经表面活性剂处理，对比例5中不含有纳米金属氧化物，制得的微发泡聚丙烯组合物的低温悬梁臂冲击强度分别为5.7kJ/m 2、6.8kJ/m 2，无法满足实际低温高耐冲的使用要求。对比例6中纳米金属氧化物的含量过多，使得微发泡聚丙烯组合物的表观密度过高，低温悬梁臂缺口冲击强度较低，为6.9kJ/m 2。对比例7中不含有聚酰胺树脂，制得的微发泡聚丙烯组合物拉伸强度和低温悬梁臂冲击强度都极低，力学性能差。 The nano-metal oxide used in Comparative Example 4 was not treated with a surfactant, and the Nano-metal oxide was not contained in Comparative Example 5. The low-temperature Izod impact strength of the micro-foamed polypropylene composition obtained was respectively 5.7kJ/m 2. 6.8kJ/m 2 , which cannot meet the actual use requirements of low temperature and high impact resistance. In comparative example 6, the content of nanometer metal oxide is too much, so that the apparent density of the microfoamed polypropylene composition is too high, and the low-temperature Izod notched impact strength is low, which is 6.9 kJ/m 2 . In Comparative Example 7, no polyamide resin was contained, and the micro-foamed polypropylene composition obtained had extremely low tensile strength and low-temperature Izod impact strength, and poor mechanical properties.
显然，本发明的上述实施例仅仅是为清楚地说明本发明所作的举例，而并非是对本发明的实施方式的限定。对于所属领域的普通技术人员来说，在上述说明的基础上还可以做出其它不同形式的变化或变动。这里无需也无法对所有的实施方式予以穷举。凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明权利要求的保护范围之内。Apparently, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the implementation of the present invention. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. All modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the claims of the present invention.

Claims (10)

  1. 一种微发泡聚丙烯组合物，所述微发泡聚丙烯组合物包括聚丙烯复合材料与发泡剂，其特征在于，所述聚丙烯复合材料包括如下重量份的组分：A kind of microfoaming polypropylene composition, described microfoaming polypropylene composition comprises polypropylene composite material and foaming agent, it is characterized in that, described polypropylene composite material comprises following components by weight:
    聚丙烯树脂76～86份，聚酰胺树脂5～10份，交联剂2～8份，纳米金属氧化物5～20份，相容剂3～8份，其他助剂0～2份，76-86 parts of polypropylene resin, 5-10 parts of polyamide resin, 2-8 parts of crosslinking agent, 5-20 parts of nano-metal oxide, 3-8 parts of compatibilizer, 0-2 parts of other additives,
    所述聚丙烯树脂在230℃、2.16kg条件下，熔体流动速率为1.8～5.0g/10min；The melt flow rate of the polypropylene resin is 1.8-5.0g/10min under the conditions of 230°C and 2.16kg;
    所述聚酰胺树脂的熔点为155～210℃，The melting point of the polyamide resin is 155-210°C,
    所述纳米金属氧化物经阳离子表面活性剂处理。The nanometer metal oxide is treated with a cationic surfactant.
  2. 根据权利要求1所述微发泡聚丙烯组合物，其特征在于，所述聚丙烯树脂为共聚聚丙烯和/或均聚聚丙烯。The microfoamed polypropylene composition according to claim 1, wherein the polypropylene resin is copolymerized polypropylene and/or homopolymerized polypropylene.
  3. 根据权利要求1所述微发泡聚丙烯组合物，其特征在于，所述聚酰胺树脂的熔点为170～185℃。The microfoamed polypropylene composition according to claim 1, wherein the polyamide resin has a melting point of 170-185°C.
  4. 根据权利要求1所述微发泡聚丙烯组合物，其特征在于，所述聚酰胺树脂为PA6/PA66/PA610共聚聚酰胺、PA6/PA6/PA1010共聚聚酰胺、PA6/PA66/PA1010共聚聚酰胺或PA6/PA66共聚聚酰胺中的一种或几种。The microfoamed polypropylene composition according to claim 1, wherein the polyamide resin is PA6/PA66/PA610 copolyamide, PA6/PA6/PA1010 copolyamide, PA6/PA66/PA1010 copolyamide Or one or more of PA6/PA66 copolyamides.
  5. 根据权利要求1所述微发泡聚丙烯组合物，其特征在于，所述纳米金属氧化物的平均粒径为50～200nm。The microfoamed polypropylene composition according to claim 1, wherein the average particle diameter of the nanometer metal oxide is 50-200 nm.
  6. 根据权利要求1所述微发泡聚丙烯组合物，其特征在于，所述阳离子表面活性剂为聚羧酸铵、乙酸铵或柠檬酸三铵中一种或几种。The microfoaming polypropylene composition according to claim 1, wherein the cationic surfactant is one or more of ammonium polycarboxylate, ammonium acetate or triammonium citrate.
  7. 根据权利要求1所述微发泡聚丙烯组合物，其特征在于，所述纳米金属氧化物为纳米氧化镁和/或纳米氧化锌。The microfoamed polypropylene composition according to claim 1, wherein the nano-metal oxide is nano-magnesium oxide and/or nano-zinc oxide.
  8. 根据权利要求1所述微发泡聚丙烯组合物，其特征在于，所述交联剂为过氧化物类交联剂。The microfoamed polypropylene composition according to claim 1, wherein the crosslinking agent is a peroxide crosslinking agent.
  9. 权利要求1～8任一项所述微发泡聚丙烯组合物的制备方法，其特征在于，包括如下步骤：The preparation method of the microfoamed polypropylene composition according to any one of claims 1 to 8, characterized in that, comprising the steps of:
    S1.将聚丙烯树脂、聚酰胺树脂、交联剂、纳米金属氧化物、相容剂、其他助剂混合均匀后，加至挤出机中，经熔融、挤出造粒，得到所述聚丙烯复合材料；S1. After mixing polypropylene resin, polyamide resin, crosslinking agent, nanometer metal oxide, compatibilizer and other auxiliary agents uniformly, add them to the extruder, melt and extrude granulation to obtain the polymer Acrylic composite materials;
    S2.将步骤S1制得的聚丙烯复合材料与发泡剂混合，经二次开模注塑成型得到所述微发泡聚丙烯组合物。S2. Mixing the polypropylene composite material prepared in step S1 with a foaming agent, and performing secondary mold opening and injection molding to obtain the microfoamed polypropylene composition.
  10. 权利要求1～8任一项所述微发泡聚丙烯组合物在制备汽车内饰件中的应 用。Application of the microfoamed polypropylene composition described in any one of claims 1 to 8 in the preparation of automotive interior parts.
PCT/CN2022/112211 2021-08-23 2022-08-12 Microfoam polypropylene composition, and preparation method therefor and application thereof WO2023024939A1 (en)

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