Search

CN-117209900-B - Novel polypropylene foaming material and preparation method and application thereof

CN117209900BCN 117209900 BCN117209900 BCN 117209900BCN-117209900-B

Abstract

The invention belongs to the technical field of polyolefin foaming materials, and particularly relates to a novel polypropylene foaming material, a preparation method and application thereof, wherein the material comprises, by weight, 60-90 parts of random copolymer polypropylene, 10-35 parts of polybutene, 1-5 parts of friction-resistant auxiliary agents, 0.5-3 parts of compatilizers and 0.1-0.5 part of cell regulators, and the novel polypropylene foaming material has the advantages of excellent ultraviolet resistance, yellowing resistance grade of more than 4, adhesive strength of more than or equal to 1.3MPa, and friction resistance DeltaL of less than or equal to 1.1, and can be applied to the field of foaming materials for outdoor structures.

Inventors

  • SUN HAOJIE
  • WANG QI
  • YANG XI
  • Shu Mengxin

Assignees

  • 黄河三角洲京博化工研究院有限公司

Dates

Publication Date
20260512
Application Date
20230831
Priority Date
20230823

Claims (7)

  1. 1. The novel polypropylene foaming material is characterized by comprising the following raw materials in parts by weight: 60-90 parts of random copolymer polypropylene; 10-35 parts of polybutene; 1-3 parts of friction-resistant auxiliary agent; 0.5-3 parts of compatilizer; 0.1-0.5 part of cell regulator; the friction-resistant auxiliary agent is one or two of polyphenylene sulfide and benzoxazine; The random copolymer polypropylene is one or more of ethylene propylene copolymer polypropylene, propylene butyl copolymer polypropylene and ethylene propylene butyl copolymer polypropylene, the number average molecular weight of the random copolymer polypropylene is 6-12 multiplied by 10 4 , and the melt index is 6-10g/10min; The polybutene has a number average molecular weight of 6-15×10 4 and a melt index of 0.5-2.5g/10min; the crystal form of the polybutene is a crystal form I'.
  2. 2. The novel polypropylene foam material according to claim 1, wherein the compatibilizer is one or more of maleic anhydride grafted polypropylene, acrylic acid grafted polypropylene and epoxy resin grafted polypropylene.
  3. 3. The novel polypropylene foam material according to claim 1, wherein the cell regulator is one or more of calcium carbonate, talcum powder, kaolin, montmorillonite and silicon dioxide.
  4. 4. The novel polypropylene foam material according to claim 1, wherein the melting curve of the foam material is of a bimodal structure, the yellowing resistance level is more than 4, the bonding strength is more than or equal to 1.3MPa, and the friction resistance DeltaL is less than or equal to 1.1.
  5. 5. A method for preparing a novel polypropylene foam material as defined in any one of claims 1 to 4, comprising the steps of: S1, uniformly mixing random copolymer polypropylene, polybutene, an antifriction auxiliary agent, a compatilizer and a foam hole regulator, and extruding and granulating by a double-screw extruder; s2, putting the pre-expanded polypropylene particles obtained in the step S1 into a high-pressure reaction container, injecting carbon dioxide fluid with a certain pressure into the container after the temperature is constant, and rapidly releasing pressure after maintaining the pressure for a period of time to obtain EPP primary expanded beads; S3, carrying out air pressure on the EPP primary foaming beads obtained in the step S2, and then introducing the EPP primary foaming beads into a secondary foaming machine, and foaming by water vapor to obtain EPP secondary foaming beads; and S4, performing steam forming on the EPP secondary foaming beads obtained in the step S3, and curing to obtain the EPP foaming material with ultraviolet resistance and high bonding strength.
  6. 6. The method for preparing the novel polypropylene foam material according to claim 5, wherein the temperature range of the reaction vessel in the step S2 is 135-155 ℃, the pressure maintaining pressure of carbon dioxide is 1.5-4.5MPa, the pressure maintaining time is 10-60min, the air pressure in the step S3 is 0.4-1.0MPa, the control temperature of the secondary foaming machine is 70-130 ℃, and the steam forming pressure in the step S4 is 1.2-3.5bar.
  7. 7. Use of a novel polypropylene foam material according to any one of claims 1-4 for the preparation of a foam material for outdoor constructions.

Description

Novel polypropylene foaming material and preparation method and application thereof Technical Field The invention belongs to the technical field of polyolefin foam materials, and particularly relates to a novel polypropylene foam material and a preparation method and application thereof. Background The polypropylene foaming material maintains the excellent performance of polypropylene, not only can reduce the weight, but also has good physical property, thermal property and recyclability, can be widely used for inner parts, sound insulation and heat insulation parts of automobiles, and can also be used for packaging materials of foods, cosmetics, electronic products and the like. The heat-resistant temperature of the foaming PS is 80 ℃, the heat-resistant temperature of the foaming PE is only 70-80 ℃, the heat-resistant temperature of the foaming PP can be up to 120 ℃, and the dimensional shrinkage rate of the foaming PP material is only 2% after the foaming PP material is placed at 120 ℃ for 22 hours, so that the foaming PP material is more suitable for being used in occasions with higher temperature. In addition, polypropylene is not only low in water absorption but also has good insulation, chemical stability and a low dielectric constant. Meanwhile, the polystyrene foam material takes alkane as a foaming agent, which is not beneficial to environmental protection and difficult to recycle, on the other hand, the plastic foam taking polyurethane as a raw material can generate partial toxic auxiliary substances in the foaming processing process, and the polyurethane foam material can not be recycled, so compared with the polypropylene foam material, the polypropylene foam material has very obvious advantages, and the polypropylene carbon dioxide foaming technology gradually replaces the traditional polyethylene, polystyrene and polyurethane foam plastic in the future due to the characteristics of green, no pollution, recycling and the like. However, the polypropylene foaming material has the problems of poor ultraviolet aging resistance, poor wear resistance, short service life, bonding strength and the like in application, for example, the ultraviolet resistance is poor, the service life is short in outdoor occasions, the main reasons are that under the combined action of light, oxygen and heat, beta bonds of polypropylene molecules are broken, alkyl free radicals, hydroxyl free radicals and peroxides are generated, so that molecular chain segments are linked and decomposed, and the random copolymerization polypropylene has a larger friction coefficient, so that the friction resistance and scratch resistance are poor. At present, the ultraviolet resistance of polypropylene is mainly improved by an ultraviolet absorber or a hindered amine light stabilizer, but the ultraviolet absorber and the hindered amine light stabilizer are organic small molecules, and have the defects of easy volatilization and easy degradation. The improvement of the friction resistance of the polypropylene material is mainly achieved by adding metal oxide, mineral powder and the like, but for the polypropylene foaming material, excessive addition of the metal oxide or the mineral powder can have adverse effects on cell nucleation, cell growth and uniform cell distribution. Disclosure of Invention In order to solve the technical problems, the invention provides a novel polypropylene foaming material, a preparation method and application thereof, and the EPP foaming material has excellent ultraviolet resistance, high bonding strength and good friction resistance, and meanwhile, due to the existence of polybutene components, the energy consumption of steam forming is reduced, the material shrinkage rate is low, the cell size and the cell punching distribution are uniform, so that the EPP foaming material is a functional polymer foaming material with excellent comprehensive performance. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the novel polypropylene foaming material comprises the following raw materials in parts by weight: preferably, the friction-resistant auxiliary agent is one or more of polyphenylene sulfide, polyketone and benzoxazine. Polyphenylene sulfide, polyketone and benzoxazine are high molecular polymers, have good friction resistance, and have better compatibility with a system compared with an inorganic friction resistance agent, and the high molecular polymers, polypropylene and polybutene chain segments are physically entangled together to form a space network structure in the melting process, so that the stability of a framework of a cell structure is improved in the foaming process, the phenomenon of cell merging and collapse is not easy to generate, and the mechanical property of the foaming material is enhanced. Preferably, the random copolymer polypropylene is one or more of ethylene propylene copolymer polypropylene, propylene butyl copolymer polypropylene