Low-emission polypropylene reclaimed material and preparation method thereof

Abstract

The invention discloses a low-emission polypropylene reclaimed material and a preparation method thereof. The polypropylene reclaimed material is composed of the following components in percentage by weight: 96.0-98.8% of polypropylene reclaimed material, 1.0-3.0% of adsorbent and 0.2-1.0% of antioxidant. The secondary processing on the polypropylene reclaimed material can aggravate the degree of oxidative degradation. The adsorbent added into the polypropylene reclaimed material can effectively adsorb low-molecular compounds, and meanwhile, adsorb and remove the acidic substances and residual catalyst in the melt, thereby inhibiting the material from further degradation and further effectively reducing the influence of the oxidative degradation of the polypropylene reclaimed material on the emission performance in the secondary processing process.

Description

technical field [0001] The invention relates to a low-emission polypropylene recycled material, in particular to a low-emission polypropylene recycled material and a preparation method thereof. Background technique [0002] Thermoplastic polymers such as PP and PE will degrade under the action of high heat and high shear force during the extrusion process. The degradation products of polymers contain a large number of low-molecular compounds, some of which will detach from the material itself in the form of gas, and will be released successively during the later application process of the material, thus polluting the application environment. The impact on the material is mainly reflected in the odor , VOC, condensation and TVOC etc. Part of the broken molecules will continue to exist in the material as molecules, and its impact on the material is mainly focused on mechanical properties, such as tensile strength, rigidity, and toughness. [0003] In recent years, the market...

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Problems solved by technology

[0003] In recent years, the market demand for polypropylene materials has shown a sharp upward trend, which means that the pressure on energy demand is also increasing. If the degradation of polyolefin materials can be effectively inhibited and the impact of degradation products on downstream applications will be reduced impact, then recycled and recycled polypropylene materials can be re-applied to conventional market demand, thereby greatly reducing the total amount of polyolefins input to the environment, the synergy between traditional hindered phenolic antioxidants and phosphite antioxidants The effect can effectively prevent the further development of the degradation process, but inevitably, a certain amount of degradation products will still be released and affect the emission performance of the material, thus adversely affecting the subsequent application. As an active substance, the adsorbent , can effectively absorb the small molecules produced during the degradation process that cannot be excluded independently and the acidic substances and catalyst residues remaining in the melt, thereby effectively improving the safety index of the recycled materials in the downstream application process

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