Sound absorption and thermal insulation polyolefin foamed sheet and preparation method thereof

Abstract

The invention discloses a sound absorption and thermal insulation polyolefin foamed sheet and a preparation method thereof. The foamed sheet comprises the following raw materials in parts by weight: 110-140 parts of component A, 20-170 parts of component B, 1-20 parts of foaming agent, 0.01-8 parts of cell regulator and 0.1-20 parts of filler, wherein the component A consists of 100 parts of polyethylene and 10-40 parts of polyethylene copolymer; and the component B consists of 10-30 parts of thermoplastic elastomer, 10-80 parts of polyolefin resin and 0-60 parts of rubber. The method comprises the following steps: weighing the polyethylene resin, the thermoplastic elastomer, the polyolefin resin, the rubber, the foaming agent, the cell regulator and the filler according to the weight parts; and performing mixing granulation, sheet extrusion, irradiation crosslinking and free foaming to obtain the foamed sheet. In the invention, the prepared foamed material integrates the sound absorption and thermal insulation functions, the opening rate reaches 5-70%, the sound absorption coefficient reaches 0.2-0.5, and the heat conductivity coefficient reaches 0.026-0.035.

Description

Technical field [0001] The invention relates to the field of foamed sheets, in particular to a sound-absorbing and heat-insulating polyolefin foamed sheet and a preparation method thereof. Background technique [0002] Foam materials can be divided into closed-cell and open-cell foam materials according to their different structures. Among them, the closed-cell foam material has an independent cell structure, and the internal cells are separated from the cells by a wall film, and they are not connected to each other. Because the thermal conductivity of the air in the cells is small, it is closed in the cells and cannot be convective. At the same time, the radiation effect between the cell walls is also very small. It is a material with very good thermal insulation performance. The widely used foam materials mainly include polystyrene, polyimide, phenolic resin, polyurethane, polyolefin and other hair materials. 泡材料. Polyurethane rigid foam materials are favored for their low the...

AI Technical Summary

Problems solved by technology

Polyurethane rigid foaming materials are favored for their low thermal conductivity, high specific strength, low cost and good mechanical strength, but they cannot be used in acid-base environments. Polyolefin cross-linked foaming materials have excellent insulation Resistance, thermoformability, moisture resistance, moisture resistance, and many production techniques, but there are problems of poor sound absorption and poor creep recovery

[0003] Compared with closed-cell foamed materials, open-celled foamed materials have extremely superior sound-absorbing performance due to the interconnection between cells, which attenuates the sound wave energy, but also has the problem of poor heat insulation performance.

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