High-strength and high-heat-resistance bio-based polyamide composition and preparation method thereof

Abstract

The invention discloses a high-strength and high-heat-resistance bio-based polyamide composition and a preparation method thereof. The high-strength and high-heat-resistance bio-based polyamide composition is prepared from the following raw materials in parts by weight: 43.50-89.95% of bio-based polyamide resin slices; 10-50% of a reinforcing body; 0.01-2% of a rare earth compound; 0.01 to 1% of a copper salt antioxidant combination; 0.01-1% of a free radical capturing agent; 0.01 to 0.5% of heat conduction master batch; 0.01-1% of a stabilizing agent; and 0-1% of a dispersant. The preparation method has the advantages that the bio-based polyamide resin slices are prepared from pentamethylene diamine and adipic acid through a step-by-step polycondensation process or prepared from pentamethylene diamine, adipic acid and terephthalic acid through a step-by-step polycondensation process, the pentamethylene diamine is prepared through starch fermentation, and the prepared polyamide resin belongs to environment-friendly engineering plastic; and in order to fill the technical blank in the field of high heat resistance of the bio-based polyamide material, components such as a rare earth compound, a copper salt antioxidant combination, a free radical scavenger and heat-conducting master batch are introduced into the formula design, so that the bio-based polyamide material is endowed with excellent long-period thermo-oxidative aging resistance.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a high-strength, high-heat-resistant bio-based polyamide composition and a preparation method thereof. Background technique [0002] Bio-based materials refer to a new class of materials manufactured by biological, chemical and physical methods using renewable biomass, including crops, trees, other plants and their residues and inclusions as raw materials. With the characteristics of green, resource saving, and environmental friendliness, it is a major focus of the future development of materials. According to the research report released by Occasm Research, the current global production of bio-based chemicals and polymer materials is about 50 million tons, and it is estimated that by 2021 The output value can reach 10 billion to 15 billion US dollars. Bio-based materials help to solve the problems of resource and energy shortages and environmental pollution faced by global econ...

AI Technical Summary

Problems solved by technology

However, most of the currently published patents are aimed at the research on the long-term thermo-oxidative aging performance of petroleum-based polyamide compositions, and there is no research on the long-term thermo-oxidative aging properties of bio-based polyamides. Heat-resistant resin, improving the oxygen barrier of the polyamide surface, and the use of antioxidants are difficult to balance performance and economic benefits, and the aging treatment conditions are generally concentrated at 150-230°C for 1000h, or after 80°C and After storage under the condition of 90% relative humidity, carry out high-temperature long-term thermal oxygen aging test

However, under the actual working conditions of automobiles, the polyamide composition is in an environment combined with periodic thermal oxygen aging (210-230°C) and periodic high temperature and high humidity (85°C, 85%RH). The tests in previous patents The conditions are different from the working conditions of the automotive engine system, which cannot objectively reflect the material performance under real working conditions, thus limiting the application range of polyamide compositions

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