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CN-122011600-A - Impact-resistant polypropylene composition with heat-resistant oil and preparation method and application thereof

CN122011600ACN 122011600 ACN122011600 ACN 122011600ACN-122011600-A

Abstract

The invention discloses an impact-resistant polypropylene composition of heat-resistant oil, a preparation method and application thereof, wherein the polypropylene composition comprises, by weight, 50-70 parts of copolymerized polypropylene, 15-25 parts of a toughening agent, 15-25 parts of an inorganic filler, 1-3 parts of an oil-resistant auxiliary agent, 0.5-1 part of a dispersing agent and 0.1-0.3 part of a nucleating agent, wherein the toughening agent is any one of an ethylene-methacrylate copolymer, an ethylene-butyl acrylate-glycidyl methacrylate copolymer or a maleic anhydride grafted polyolefin elastomer. The polypropylene composition of the invention can realize excellent hot oil resistance and high impact strength, and simultaneously can realize good surface smoothness and food contact safety.

Inventors

  • BAI HUA

Assignees

  • 东莞市富华塑胶有限公司

Dates

Publication Date
20260512
Application Date
20260401

Claims (10)

  1. 1. An impact-resistant polypropylene composition with heat-resistant oil is characterized by comprising the following components in parts by weight: 50-70 parts of copolymerized polypropylene; 15-25 parts of a toughening agent; 15-25 parts of inorganic filler; 1-3 parts of oil-resistant auxiliary agent; 0.5-1 part of dispersing agent; 0.1-0.3 part of nucleating agent; Wherein the toughening agent is any one of ethylene-methacrylate copolymer, ethylene-butyl acrylate-glycidyl methacrylate copolymer or maleic anhydride grafted polyolefin elastomer.
  2. 2. The polypropylene composition according to claim 1, wherein the copolymerized polypropylene is any one of an impact copolymerized polypropylene or a random copolymerized polypropylene.
  3. 3. The polypropylene composition according to claim 1, wherein the melt index of the copolymer polypropylene is 15-25 g/10min.
  4. 4. The polypropylene composition according to claim 1, wherein the mass ratio of the copolymerized polypropylene to the inorganic filler is (2.5-5): 1.
  5. 5. The polypropylene composition according to claim 1, wherein the inorganic filler is any one or more of needle-like wollastonite, platy talc or silica microspheres.
  6. 6. The polypropylene composition according to claim 5, wherein the platy talc has a flake diameter of 2 to 5 μm.
  7. 7. The polypropylene composition according to claim 1, further comprising 0.1 to 0.3 parts by weight of an antioxidant.
  8. 8. A process for the preparation of a polypropylene composition according to any one of claims 1 to 7, comprising the steps of: s1, pretreating and premixing raw materials, namely weighing inorganic filler and dispersing agent according to parts by weight, putting the inorganic filler and the dispersing agent into a high-speed mixer, mixing the inorganic filler and the dispersing agent for 3-5 minutes at normal temperature at a rotating speed of 800-1200 rpm to form preactivated filler, and uniformly mixing the preactivated filler with other components according to parts by weight to obtain a mixed material; s2, adding the uniformly mixed materials into a double-screw extruder for melt blending, extruding and granulating, and drying to obtain the polypropylene composition.
  9. 9. The process for producing a polypropylene composition according to claim 8, wherein the extrusion screw has an aspect ratio of (40-48) 1, the extruder temperature is 1 zone 80-120 ℃,2-5 zone 210-240 ℃,6-8 zone 220-245 ℃, and the screw speed of the twin-screw extruder is 300-400 r/min.
  10. 10. Use of the polypropylene composition according to any one of claims 1 to 7 for the preparation of food cutlery boxes.

Description

Impact-resistant polypropylene composition with heat-resistant oil and preparation method and application thereof Technical Field The invention relates to the technical field of high polymer materials, in particular to an impact-resistant polypropylene composition of heat-resistant oil, and a preparation method and application thereof. Background Polypropylene (PP) has become a main stream material for disposable cutlery boxes because of its light weight, non-toxicity, chemical corrosion resistance, excellent processability, low cost, etc., wherein homo-polypropylene and common impact co-polypropylene are widely used in the field of takeaway cutlery boxes, etc., by virtue of their good rigidity and processing flowability. However, with the rapid development and improvement of quality requirements in the takeaway industry, the conventional polypropylene cutlery box has serious defects in three aspects of impact resistance, heat and oil resistance and surface smoothness, and the three have obvious contradiction of eliminating each other, so that the high-end application requirements are difficult to meet. In the aspect of heat and oil resistance, the temperature of oil foods such as fried foods, braised dishes and the like in Chinese fast food reaches 80-120 ℃, the heat-resistant deformation temperature of common polypropylene is lower (the homo-PP is 90-100 ℃, the co-PP is 85-95 ℃), the polypropylene is easy to soften, warp and even leak when heated oil is at Cheng Fanggao ℃, and meanwhile, the polypropylene molecular chain has high affinity to grease, and is easy to expand when contacted for a long time, so that the strength is reduced. In terms of impact resistance, the cutlery box with the thinned design is easy to damage in transportation and distribution, and particularly the toughness of the cutlery box is rapidly reduced in a low-temperature environment in winter, and the cutlery box can be broken and leaked due to slight collision. In the aspect of surface smoothness, the surface glossiness is low after injection molding, flow marks and pits are easy to appear, when filler is added to improve rigidity, uneven dispersion of the filler can also form a white spot or orange peel effect, the product grade is reduced, and the adhesion of greasy dirt is increased. More critical is that inorganic filler is added to improve the heat resistance and the oil resistance, but the impact toughness and the surface smoothness are reduced, elastomer toughening agent is added to improve the impact resistance, but the heat resistance oil ability is weakened, the glossiness is influenced, and the filler dosage is often reduced to improve the surface smoothness, so that the heat resistance oil property is sacrificed. Therefore, there is a need for developing a polypropylene composition which is capable of simultaneously achieving both heat and oil resistance and impact resistance while ensuring a smooth surface. Disclosure of Invention Aiming at the defects in the prior art, the invention provides an impact-resistant polypropylene composition of heat-resistant oil, and a preparation method and application thereof. The invention aims to prepare the polypropylene material for the disposable cutlery box, which has excellent heat and oil resistance, high impact strength and good surface smoothness by carefully selecting matrix resin, a toughening agent, inorganic filler and functional auxiliary agent and optimizing the proportion and the process, so as to overcome the defects in the prior art. The invention provides a heat-resistant impact-resistant polypropylene composition, which comprises, by weight, 50-70 parts of copolymerized polypropylene, such as 50, 55, 60, 65 and 70 parts of a toughening agent, such as 15, 18, 20, 22 and 25 parts of an inorganic filler, such as 15, 18, 20, 22 and 25 parts of an oil-resistant additive, 1-3 parts of an oil-resistant additive, such as 1, 1.5, 2, 2.5 and 3 parts of a dispersing agent, 0.5-1 part of a dispersing agent, 0.5, 0.6, 0.7, 0.8, 0.9 and 1 part of a nucleating agent, such as 0.1, 0.2 and 0.3 part of a nucleating agent, wherein the toughening agent is any one of ethylene-methacrylate copolymer, ethylene-butyl acrylate-glycidyl methacrylate copolymer or maleic anhydride grafted polyolefin elastomer. The invention realizes multi-level resistance to high-temperature oil medium through cooperative construction of a triple protection system, firstly, aiming at a rigid framework, the invention forms a three-dimensional rigid network penetrating each other in a polypropylene matrix by adding inorganic filler into a formula, and the network structure has extremely high thermal stability, when the material contacts high-temperature hot oil, the rigid framework can effectively resist heat flow softening, and provides structural support for the material. Meanwhile, the addition of the nucleating agent obviously improves the crystallinity of the polypropylene, so that the molecular chain arr