WO2022127858A1 - 一种高熔体强度聚丙烯材料及其制备方法和应用 - Google Patents

一种高熔体强度聚丙烯材料及其制备方法和应用 Download PDF

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WO2022127858A1
WO2022127858A1 PCT/CN2021/138775 CN2021138775W WO2022127858A1 WO 2022127858 A1 WO2022127858 A1 WO 2022127858A1 CN 2021138775 W CN2021138775 W CN 2021138775W WO 2022127858 A1 WO2022127858 A1 WO 2022127858A1
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polypropylene
melt
polypropylene material
melt strength
strength polypropylene
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PCT/CN2021/138775
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French (fr)
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陆湛泉
黄险波
叶南飚
陈平绪
程文建
程书文
姜向新
杨霄云
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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
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10—Homopolymers or copolymers of propene
    • C08L23/12—Polypropene
    • 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
    • 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
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • 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
    • C08L2205/04—Polymer mixtures characterised by other features containing interpenetrating networks

Definitions

  • the invention relates to the technical field of engineering plastics, in particular to a high melt strength polypropylene material and a preparation method and application thereof.
  • Polypropylene material is currently the most widely used polymer material. It has the advantages of excellent processing performance and mechanical properties, and is widely used in daily life and industrial production fields, such as: agricultural film, wire and cable, communication, housing construction and aviation manufacturing. Wait.
  • the polyolefin materials suitable for blow molding and blister molding are basically HDPE or PP pure resins. These resins can be molded well, but they still need to be improved in terms of heat resistance and strength.
  • the industry usually uses the high strength and high rigidity of glass fiber to improve product strength and heat resistance, but conventional glass fiber reinforced polypropylene materials have low melt strength, low melt elongation, and surface floating fibers and poor toughness. And other issues.
  • the purpose of the present invention is to provide a polypropylene material with high melt strength that is beneficial to blow molding and suction molding.
  • Another object of the present invention is to provide a method for preparing the above-mentioned high melt strength polypropylene material.
  • a high melt strength polypropylene material, by weight, comprising the following components:
  • the high melt strength polypropylene material in parts by weight, includes the following components:
  • the melt index MI of the linear polypropylene is 0.01-10 g/10min, and the test conditions are 230° C., 2.16Kg load; preferably 0.1-3 g/10min.
  • the melt index MI of the long-chain branched polypropylene is 0.01-10 g/10min, and the test conditions are 230° C., 2.16Kg load; preferably 0.1-3 g/10min.
  • the fluorine compound is ethylene-tetrafluoroethylene copolymer (ETFE), polytetrafluoroethylene (PTFE), fluorinated ethylene propylene copolymer (FEP), perfluoroalkoxy resin (PFA), polychlorinated One or more mixtures of trifluoroethylene (PCTFE), ethylene-monochlorotrifluoroethylene copolymer (ECTFE) or polyvinylidene fluoride (PVDF).
  • ETFE ethylene-tetrafluoroethylene copolymer
  • PTFE polytetrafluoroethylene
  • FEP fluorinated ethylene propylene copolymer
  • PFA perfluoroalkoxy resin
  • PCTFE polychlorinated One or more mixtures of trifluoroethylene
  • ECTFE ethylene-monochlorotrifluoroethylene copolymer
  • PVDF polyvinylidene fluoride
  • high molecular weight fluorine compounds are preferred, which do not melt during the molding process, and will be stretched into fibers under the action of the melt, so that the polypropylene molecular chain and the fluorine compound fibers will form an interpenetrating network, thereby further improving the The melt strength of the entire material. If the molecular weight is too low, the improvement of the melt strength is not obvious, and if the molecular weight is too high, the processing performance is affected. Therefore, preferably, the weight average molecular weight of the fluorine compound is 10-10 million, preferably 5-8 million.
  • the present invention also provides a method for preparing the above-mentioned high-melt-strength polypropylene material. system; and then melt blending and extrusion pelletizing through a twin-screw extruder to prepare a high melt strength polypropylene material.
  • the temperature of the first to second zones of the twin-screw extruder is 120°C-160°C
  • the temperature of the third to fifth zone is 180°C-300°C
  • the temperature of the fifth to tenth zone is 180°C-300°C
  • the screw speed is 300rpm-600rpm.
  • the present invention also provides the application of the above-mentioned high melt strength polypropylene material in blow molding and suction molding occasions.
  • the present invention has the following beneficial effects:
  • the present invention provides a high-melt-strength polypropylene material, including straight-chain polypropylene, long-chain branched polypropylene and fluorine compounds, wherein the long molecular chains of the straight-chain polypropylene are used to increase the entanglement between the molecular chains , which is beneficial to improve the stability of the melt during extrusion and blistering; the addition of long-chain branched polypropylene, using its branched chain structure, can greatly improve the melt strength; high molecular weight fluorine compounds do not melt during the molding process, and are Under the action of the melt, it will be drawn into fibers, so that the polypropylene molecular chains and the fluorine compound fibers will form an interpenetrating network, thereby further improving the melt strength of the entire material.
  • the polypropylene material prepared by the invention has high melt strength, and is mainly suitable for blow molding and suction molding and other occasions.
  • the raw materials used in the examples of the present invention and the comparative examples are all from commercially available;
  • Linear polypropylene 1 MI is 2g/10min (230°C, 2.16Kg load);
  • Linear polypropylene 2 MI is 8g/10min (230°C, 2.16Kg load);
  • Linear polypropylene 3 MI is 20g/10min (230°C, 2.16Kg load);
  • MI is 3g/10min (230°C, 2.16Kg load);
  • MI 10g/10min (230°C, 2.16Kg load);
  • MI is 25g/10min (230°C, 2.16Kg load);
  • Fluorine compound 1 weight average molecular weight 50W polytetrafluoroethylene
  • Fluorine compound 2 weight average molecular weight 500W polytetrafluoroethylene
  • Fluorine compound 3 weight average molecular weight 1W polytetrafluoroethylene.
  • Example 1-11 and Comparative Example 1-2 Preparation of High Melt Strength Polypropylene Material
  • the temperature of the first to second zones of the extruder is 120°C-160°C
  • the temperature of the third to fifth zone is 180°C-300°C
  • the temperature of the fifth to tenth zone is 180°C-300°C
  • the screw speed is 300rpm-600rpm.
  • Melt fracture rate Melt extensional rheometer test, test condition: 180°C.
  • the polypropylene material comprising straight-chain polypropylene, long-chain branched polypropylene and fluorine compounds of the present invention has significantly improved melt strength and melt fracture speed, and is suitable for blow molding and blister molding and other occasions.
  • Comparative example 1 did not add long-chain branched polypropylene, and its melt strength and melt fracture rate were poor; in comparative example 2, long-chain branched polypropylene was introduced, but no fluorine compound was added, and its melt strength and melt The breaking speed is slightly increased, but the improvement effect is not obvious, which shows that there is a synergistic effect between the components of the present invention.

Abstract

本发明公开了一种高熔体强度聚丙烯材料及其制备方法和应用，包括：直链聚丙烯10-90份；长支链聚丙烯0.5-50份；氟类化合物0.01-20份。本发明利用直链聚丙烯的长分子链，增加分子链之间的缠结，利于提高挤出和吸塑时熔体的稳定；长支链聚丙烯的加入，利用其支链结构，可以极大提高熔体强度；氟类化合物在成型过程中不熔，在熔体的作用下会被拉伸为纤维，这样聚丙烯分子链和氟类化合物纤维会形成互穿网络，从而进一步提高整个材料的熔体强度。本发明制备得到的聚丙烯材料具有较高的熔体强度，主要适用于吹塑和吸塑等场合。

Description

一种高熔体强度聚丙烯材料及其制备方法和应用 技术领域
本发明涉及工程塑料技术领域，特别涉及一种高熔体强度聚丙烯材料及其制备方法和应用。
背景技术
聚丙烯材料是目前用量最大的高分子材料，具有优异的加工性能和力学性能等优点，被广泛应用于日常生活和工业生产领域，如：农用薄膜、电线电缆、通讯、房屋建筑和航空制造业等。
目前适用于吹塑和吸塑用的聚烯烃材料，基本都是HDPE或者PP纯树脂，这些树脂能较好地成型，但是在耐热和强度方面还需要改善。行业内通常是利用玻璃纤维的高强度和高刚性来提高产品强度和耐热，但常规的玻璃纤维增强聚丙烯材料具有熔体强度低，熔体延伸率低，还有表面浮纤和韧性差等问题。
因此，有必要研究一种适用于吹塑和吸塑用的高熔体强度聚丙烯材料。
发明内容
为了克服现有技术的缺点与不足，本发明的目的在于提供一种利于吹塑和吸塑等场合的高熔体强度的聚丙烯材料。
本发明的另一目的是提供上述高熔体强度聚丙烯材料的制备方法。
本发明是通过以下技术方案实现的：
一种高熔体强度聚丙烯材料，按重量份计，包括以下组分：
直链聚丙烯    10-90份；
长支链聚丙烯  0.5-50份；
氟类化合物    0.01-20份。
作为本发明进一步优选的实施方式，高熔体强度聚丙烯材料，按重量份计，包括以下组分：
直链聚丙烯   40-75份；
长支链聚丙烯 20-40份；
氟类化合物   8-20份。
优选的，所述直链聚丙烯的熔融指数MI为0.01-10g/10min，测试条件为230℃，2.16Kg负荷；优选为0.1-3g/10min。
优选的，所述长支链聚丙烯的熔融指数MI为0.01-10g/10min，测试条件为230℃，2.16Kg负荷；优选为0.1-3g/10min。
优选的，所述氟类化合物为乙烯-四氟乙烯共聚物(ETFE)、聚四氟乙烯(PTFE)、氟化乙丙共聚物(FEP)、全氟烷氧基树脂(PFA)、聚氯三氟乙烯(PCTFE)、乙烯-一氯三氟乙烯共聚合物(ECTFE)或聚偏氟乙烯(PVDF)中一种或几种的混合物。
本发明优选高分子量的氟类化合物，其在成型过程中不熔，在熔体的作用下会给拉伸为纤维，这样聚丙烯分子链和氟类化合物纤维会形成互穿网络，从而进一步提高整个材料的熔体强度。分子量过低，对熔体强度的改善不明显，分子量过高，影响其加工性能，因此，优选的，所述氟类化合物的重均分子量为10-1000万，优选为500-800万。
本发明还提供上述高熔体强度聚丙烯材料的制备方法，其步骤如下：按照配方含量称量各组分，并将各组分混合均匀，随后将混合物加入双螺杆挤出机的主喂料***；然后通过双螺杆挤出机熔融共混、挤出造粒制备得到高熔体强度聚丙烯材料。
优选的，双螺杆挤出机一至二区温度为120℃-160℃，三至五区温度为180℃-300℃，五至十区温度为180℃-300℃，螺杆转速为300rpm-600rpm。
本发明还提供了上述高熔体强度聚丙烯材料在吹塑和吸塑场合中的应用。
本发明与现有技术相比，具有如下有益效果：
本发明提供了一种高熔体强度聚丙烯材料，包括直链聚丙烯、长支链聚丙烯和氟类化合物，其中，利用直链聚丙烯的长分子链，增加分子链之间的缠结，利于提高挤出和吸塑时熔体的稳定；长支链聚丙烯的加入，利用其支链结构，可以极大提高熔体强度；高分子量的氟类化合物在成型过程中不熔，在熔体的作用下会被拉伸为纤维，这样聚丙烯分子链和氟类化合物纤维会形成互穿网络，从而进一步提高整个材料的熔体强度。
本发明制备得到的聚丙烯材料具有较高的熔体强度，主要适用于吹塑和吸塑等场合。
具体实施方式
下面通过具体实施方式来进一步说明本发明，以下实施例为本发明较佳的实施方式，但本发明的实施方式并不受下述实施例的限制。
本发明实施例和对比例所采用的原料均来源于市购；
直链聚丙烯1：MI为2g/10min(230℃，2.16Kg负荷)；
直链聚丙烯2：MI为8g/10min(230℃，2.16Kg负荷)；
直链聚丙烯3：MI为20g/10min(230℃，2.16Kg负荷)；
长支链聚丙烯1：MI为3g/10min(230℃，2.16Kg负荷)；
长支链聚丙烯2：MI为10g/10min(230℃，2.16Kg负荷)；
长支链聚丙烯3：MI为25g/10min(230℃，2.16Kg负荷)；
氟类化合物1：重均分子量50W聚四氟乙烯；
氟类化合物2：重均分子量500W聚四氟乙烯；
氟类化合物3：重均分子量1W聚四氟乙烯。
实施例1-11及对比例1-2：高熔体强度聚丙烯材料的制备
按照表1配方含量称量各组分，并将各组分混合均匀，随后将混合物加入双螺杆挤出机的主喂料***；然后通过双螺杆挤出机熔融共混、挤出造粒制备得到聚丙烯材料。
其中挤出机一至二区温度为120℃-160℃，三至五区温度为180℃-300℃，五至十区温度为180℃-300℃，螺杆转速为300rpm-600rpm。
各性能的测试标准或方法：
熔体强度：熔体拉伸流变仪测试，测试条件：180℃；
熔体断裂速度：熔体拉伸流变仪测试，测试条件：180℃。
表1各实施例与对比例中各组分的具体配比(重量份)及各性能测试结果
Figure PCTCN2021138775-appb-000001
由上表可以看出，本发明包含直链聚丙烯、长支链聚丙烯和氟类化合物的聚丙烯材料，其熔体强度和熔体断裂速度明显提高，适用于吹塑和吸塑等场合。对比例1未加入长支链聚丙烯，其熔体强度和熔体断裂速度均较差；对比例2中引入了长支链聚丙烯，但未加入氟类化合物，其熔体强度和熔体断裂速度稍微有所提高，但提高效果不明显，由此可以表明，本 发明各组分之间具有协同增效作用。

Claims (9)

  1. 一种高熔体强度聚丙烯材料，其特征在于，按重量份计，包括以下组分：
    直链聚丙烯     10-90份；
    长支链聚丙烯   0.5-50份；
    氟类化合物     0.01-20份。
  2. 根据权利要求1所述的高熔体强度聚丙烯材料，其特征在于，按重量份计，包括以下组分：
    直链聚丙烯     40-75份；
    长支链聚丙烯   20-40份；
    氟类化合物     8-20份。
  3. 根据权利要求1或2所述的高熔体强度聚丙烯材料，其特征在于，所述直链聚丙烯的熔融指数MI为0.01-10g/10min，测试条件为230℃，2.16Kg负荷；优选为0.1-3g/10min。
  4. 根据权利要求1或2所述的高熔体强度聚丙烯材料，其特征在于，所述长支链聚丙烯的熔融指数MI为0.01-10g/10min，测试条件为230℃，2.16Kg负荷；优选为0.1-3g/10min。
  5. 根据权利要求1或2所述的高熔体强度聚丙烯材料，其特征在于，所述氟类化合物为乙烯-四氟乙烯共聚物ETFE、聚四氟乙烯PTFE、氟化乙丙共聚物FEP、全氟烷氧基树脂PFA、聚氯三氟乙烯PCTFE、乙烯-一氯三氟乙烯共聚合物ECTFE或聚偏氟乙烯PVDF中的一种或几种的混合物。
  6. 根据权利要求5所述的高熔体强度聚丙烯材料，其特征在于，所述氟类化合物的重均分子量为10-1000万，优选为500-800万。
  7. 根据权利要求1-6任一项所述的高熔体强度聚丙烯材料的制备方法，其步骤如下：
    按照配方含量称量各组分，并将各组分混合均匀，随后将混合物加入双螺杆挤出机的主喂料***；然后通过双螺杆挤出机熔融共混、挤出造粒制备得到高熔体强度聚丙烯材料。
  8. 根据权利要求7所述的高熔体强度聚丙烯材料的制备方法，其特征在于，所述双螺杆挤出机一至二区温度为120℃-160℃，三至五区温度为180℃-300℃，五至十区温度为180℃-300℃，螺杆转速为300rpm-600rpm。
  9. 根据权利要求1-6任一项所述的高熔体强度聚丙烯材料在吹塑或吸塑场合中的应用。
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