Sound and shock insulating composition for automobile interior decoration industry

Abstract

The invention discloses a sound and shock insulating composition for automobile interior decoration industry. The composition comprises polyethylene and modified hollow beads, wherein polyethylene is selected from high density polyethylene, low density polyethylene, ultra high molecular weight polyethylene and linear low density polyethylene; the grain size of the hollow beads is 0.1-400 microns, the true density is 0.4-2.5g / cm<3> and the bulk density is 0.26-1.2g / cm<3>. The finished product obtained by the invention has the characteristics of being high in tensile strength, high in elongation at break, flexible, damping, sound insulating and noise reducing, and is simple in technical process. The breaking strength of the obtained product is over 3402kpa, the elongation at break is over 485%, the hardness is over 78 shore hardness A and the noise exposure at 250hz is below 30 decibel. The composition simultaneously meets environmental technical indexes.

Description

technical field [0001] The invention relates to a composition for sound and shock insulation in the automobile interior decoration industry, more particularly to a sound and shock insulation composition for the automobile interior decoration industry. Background technique [0002] With the prosperity and development of China's national economy and the higher and higher living standards of the people, cars will become a new consumption hotspot. The annual growth rate of value is more than 20 percentage points higher. However, there is still a big gap between China's car production technology and foreign countries. An important aspect of this gap is reflected in the large-scale promotion and application of new materials and technologies in China. Therefore, we should focus on new materials and technologies for foreign cars, narrow the gap, and raise the level of my country's car production technology to a higher level. [0003] Improving the comfort and safety of cars and t...

AI Technical Summary

Problems solved by technology

This sheet has a good barrier type, but its material strength is low and cannot be molded. It is mostly used for flat floors of trucks or cars. This material is currently the main barrier sheet for vehicles in China.

[0007] PVC-based soft barrier sheet: This material is a thermoplastic barrier soft sheet of PVC filled with inorganic substances and plasticized with plasticizers. Due to the relatively large proportion of PVC resin itself, it can be easily prepared with high specific gravity. sheet, but there are two major defects in this material: first, low molecular plasticizers are easy to precipitate, which will greatly reduce the mechanical properties of the sheet, and when the sheet is poured into a soft polyurethane foam layer, the two The material cannot be effectively bonded; secondly, this kind of sheet is not easy to recycle and is not environmentally friendly. It will release a large amount of harmful hydrogen chloride gas and produce carcinogens when burned

Chinese patent CN1583864A discloses a preparation method of a sound-insulating damping and noise-reducing sheet for cars, but the sound-insulating and noise-reducing effect is not outstanding

The general production process of this kind of sound insulation sheet is: first granulate with co-rotating twin-screw extruder, and then extrude the sheet with single-screw plasticization. The disadvantages are: First, due to the large amount of inorganic substances, the common The process is: first use the co-rotating twin-screw extruder to granulate, and then use the single-screw extruder to plasticize and extrude the sheet. Because the particles are easy to absorb moisture and difficult to dry, it is easy to run out of the single-screw extruder vacuum, and the volatile matter The pumping is not clean, the extrusion is unstable, and there are water threads on the surface of the product; secondly, due to the large amount of inorganic fillers and the general production process, the single-screw extruder has a plasticizing function due to its high aspect ratio and poor material fluidity. The thickness of the prepared sheet is uneven, the load of the motor is large, the equipment wears out, and it is impossible to produce wide-width products; in addition, the process flow is relatively complicated

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