Creep-resistant polypropylene composite material with interpenetrating network structure and preparation method thereof

Abstract

The invention discloses a creep-resistant polypropylene composite material with an interpenetrating network structure and a preparation method thereof. The polypropylene composite material includes the following components: low melting index polypropylene, antioxidant, surfactant, compatibilizer, nucleating agent, polymeric MDI, polyether polyol, polyester polyol, delayed amines catalyst. The polypropylene composite material in the present invention has better creep resistance, and can improve the service life of the material under the working condition of long-term alternating stress.

Description

technical field [0001] The invention relates to a polypropylene composite material, in particular to a creep-resistant polypropylene composite material with an interpenetrating network structure and a preparation method thereof, belonging to the technical field of polypropylene modification. Background technique [0002] As a general-purpose plastic, polypropylene has the advantages of low price and good heat resistance. It is widely used in automobiles, home appliances, office supplies and various electronic and electrical fields. Especially in recent years, the functionalization technology of polypropylene has become more and more In some special fields, it replaces engineering plastics and is used as some structural parts, requiring parts to have a longer service life, and higher requirements for creep resistance of polypropylene materials, but due to its semi-crystalline molecular morphology, molecular chain Long and compliant, under the stress of long-term fatigue, the ...

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Problems solved by technology

[0003] Chinese patent CN106188862A provides a polypropylene composite material with excellent creep resistance, by introducing polybutene-1 and β-nucleating agent, wherein polybutene-1 is introduced to increase the entanglement of molecular chains, β-nucleating agent to Increase the bonding point to reduce the occurrence of creep, but both methods are a kind of physical combination, and the crystal form produced by the β-nucleating agent has an unstable shape, and finally has limited ability to limit the molecular chain of polypropylene. Cannot significantly improve its creep resistance properties

[0004] Chinese patent CN105504500A provides a preparation method of creep-resistant polypropylene composite material. By introducing a cooling masterbatch into the formula, the molecular chain of polypropylene is degraded and micro-crosslinked during the extrusion process, resulting in limited bonding points. The molecular chain moves to improve the creep resistance performance, but on the one hand, the molecular chain becomes shorter through degradation, and other mechanical properties will be lost. In addition, the process of peroxide degradation is uncontrollable, and the product performance stability is poor, resulting in improved creep resistance of the material space is limited

[0005] The current creep-resistant polypropylene composite materials mainly use aspect ratio fillers, nucleating agents or other resins with long chain branches to increase physical bonding points, the intermolecular force is weak, and the other part undergoes microscopic degradation through degradation. Cross-linking, but the process is uncontrollable, and the molecular chain breaks obviously, and the performance of the composite material drops significantly

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