Preparation method of high-solid content wide-temperature range damping polyurethane aqueous dispersion containing nanofiller

Abstract

The invention discloses a preparation method of a high-solid content wide-temperature range damping polyurethane aqueous dispersion containing nanofiller. The preparation method mainly comprises the following steps of: combining polyhydric alcohols and isocyanate to prepare a polyurethane prepolymer (a); preparing an emulsifiable polyurethane prepolymer by using a hydrophilic chain extender (b); and neutralizing and emulsifying, then carrying out secondary chain extension and nanometer hybridization to obtain the aqueous dispersion. The olyurethane dispersion disclosed by the invention is in line with environmental requirements of modern industries by taking water as a dispersion medium, has good storage stability and is simple and practicable in a preparative technology. Compared with a conventional waterborne polyurethane aqueous dispersion, the high-solid content wide-temperature range damping polyurethane aqueous dispersion containing nanofiller has super-high solid content of 50%-60% and high damping behavior (tan delta greater than 0.3) in a wide-temperature range of -50 DEG C to 90 DEG C. The high-solid content wide-temperature range damping polyurethane aqueous dispersion containing nanofiller is an environment-friendly functional polyurethane damping material and can be widely applied to various fields of national economy such as aerospace, automobiles, ship building, precise instruments, architectural ornaments and the like.

Description

technical field

[0001] The invention relates to the preparation of a high-solid-content wide-temperature-range damping polyurethane water dispersion, in particular to a preparation method of a high-solid-content wide-temperature-range damping polyurethane water dispersion which can be used in coating compositions and contains nano fillers. technical background

[0002] Damping material is a functional material that can absorb vibration mechanical energy and convert it into heat energy and dissipate it. The damping vibration reduction and noise reduction technology uses the principle that the damping material converts kinetic energy into heat energy when it deforms, which can reduce various types of mechanical energy. Vibration and noise, improve the precision and life of machinery, and eliminate environmental pollution caused by vibration and noise. There are many types of damping materials, which can be summarized as follows: polymer damping materials, high damping alloys, ...

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