Sound insulation material

Abstract

The invention provides a composition. The composition comprises polyethylene and hollow micro beads. The hollow micro beads have particle sizes of 0.1 to 400 micrometers, true densities of 0.4 to 2.5g / cm<3> and stacking densities of 0.26 to 1.2g / cm<3>. The soft damping sound insulation noise reduction material with high tensile strength and high breaking elongation, which is obtained from the composition disclosed by the invention, has a simple technical process. The obtained product has breaking strength of over 3,402kPa, elongation of over 485 percent, hardness of over 78 Shore A and 250Hz noise exposure of below 30 decibels. The composition also meets the environmental-friendly technical indexes.

Description

technical field [0001] The invention relates to a composition for sound insulation and shock insulation in the automobile interior decoration industry, more particularly to a composition for sound insulation and shock insulation in the automobile interior decoration industry. The composition includes hollow microspheres. Background technique [0002] With the development of China's national economy, people's living standards are getting higher and higher, and cars will become a new consumption hotspot in China. In recent years, the growth rate of domestic car consumption and production has exceeded 30%, which is higher than the national production of the same year. The annual growth rate of the total 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 Chin...

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, the low molecular plasticizer is easy to precipitate, which will greatly reduce the mechanical properties of the sheet, and when the sheet is poured with a soft polyurethane foam layer, the two materials Can not be effectively bonded; second, this kind of sheet is not easy to recycle, 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 a co-rotating twin-screw extruder, and then use a single-screw to plasticize and extrude the sheet. The disadvantages are: First, due to the large amount of inorganic filling, the common process Yes: Use the co-rotating twin-screw extruder to granulate first, 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 for the single-screw extruder to run out of the vacuum and the volatile matter is extracted. It is not clean, the extrusion is unstable, and there are water threads on the surface of the product; Second, due to the large amount of inorganic filling and the general production process, the single-screw extruder has the plasticizing function of Bishun, the ratio of length to diameter is large, and the material fluidity is poor. The thickness of the obtained sheet is uneven, the load of the motor is large, the wear of the equipment is large, and it is impossible to produce wide-width products; in addition, the process flow is also relatively complicated

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