Utilizing Waste Cotton/Pigeon Pea Stalk Fibers Composites for Enhanced Sound Absorption and Insulation in Automotive Interiors

ABSTRACT

This study investigates the synthesis and characterization of composite materials, pigeon pea stem, and cotton fibers blended in different ratios such as 100/0, 70/30, 60/40, 50/50, 30/70, and 0/100. These composite materials were produced using a compression molding technique. According to ASTM standards, the acoustics, thermal conductivity, and physical characteristics of the composite samples were tested to assess their qualities. The impedance tube method detailed in ASTM E1050 was used to determine the sound absorption coefficients (SAC) for acoustics. The SAC values were measured at six frequencies such as 125, 250, 500, 1000, 2000, and 4000 Hz. The results showed that composite samples made from waste cotton and pigeon pea demonstrated sound absorption values of greater than 80%. Superior sound insulation and absorption, moisture absorption, fiber properties have also been demonstrated by waste composites. Especially, the waste cotton/pea stalk waste fiber composites achieved over 75% sound absorption, while the waste 28% composites performed well in terms of sound absorption, moisture absorption, and fiber properties. Even in humid conditions, the composite samples constructed from used cotton and pigeon pea stalks demonstrated good moisture resistance without reducing their insulating qualities. Soundproofing barriers are composite layers of foam or pigeon pea/cotton.

摘要

本研究研究了以 100/0、70/30、60/40、50/50、30/70 和 0/100 等不同比例混合的复合材料、木豆茎和棉纤维的合成和表征。这些复合材料是使用压缩成型技术生产的。根据 ASTM 标准，对复合材料样品的声学、导热性和物理特性进行了测试，以评估其质量。 ASTM E1050 中详述的阻抗管方法用于确定声学吸声系数 (SAC)。 SAC值是在125、250、500、1000、2000和4000Hz等六个频率下测量的。结果表明，由废棉和木豆制成的复合材料样品的吸声值大于80%。废旧复合材料也表现出了优越的隔音吸音、吸湿、纤维特性。特别是废棉/豌豆秆废纤维复合材料的吸声率达到75%以上，而废28%复合材料在吸声、吸湿和纤维性能方面表现良好。即使在潮湿的条件下，由用过的棉花和木豆秆制成的复合材料样品也表现出良好的防潮性，而不会降低其绝缘性能。隔音屏障是泡沫或木豆/棉的复合层。

KEYWORDS:

• Acoustics
• composite
• impedance tube
• Thermal insulation
• pigeon pea stalk fibers
• sound absorption

关键词:

• 声学
• 混合成的
• 阻抗管
• 隔热
• 鸽子豌豆茎纤维
• Sound absorption吸声

Disclosure statement

No potential conflict of interest was reported by the author(s).

Highlight of the paper

The study investigates waste cotton and pigeon pea stalk composite materials for sound absorption, thermal conductivity, and physical characteristics. The waste composites demonstrated over 80% sound absorption and excellent insulation, moisture resistance, and fiber properties. Notably, the waste cotton/pea stalk composites achieved over 75% sound absorption and maintained their qualities even in humid conditions. These materials offer cost-benefit advantages and contribute to green structures, making them promising substitutes for natural fiber composites in various applications, promoting eco-friendly practices and sustainable development.

Key findings and contributions of the study:

• The study successfully synthesized composite materials using waste cotton and pigeon pea stem fibers in different ratios. These waste composites offer potential solutions for sustainable development, as they utilize agricultural waste materials that would otherwise be discarded

• The waste composite materials demonstrated excellent sound absorption capabilities, with some samples achieving sound absorption values of over 80%. The composites showed consistent enhancement in sound-absorbing performance as the frequency increased, making them suitable for noise control applications, especially in handling high-frequency sounds effectively

• The utilization of waste cotton and pigeon pea materials in composite production contributes to green building initiatives and sustainable practices, promoting eco-friendly products and reducing environmental waste.

Novelty of the paper

The paper explores the synthesis and characterization of waste composite materials using pigeon pea stem and cotton fibers. The use of agricultural waste materials for composite production contributes to sustainable practices and environmental benefits.