Multifunctional damping film for automobile and preparation method thereof

Abstract

The invention discloses an automobile-used multifunctional damping rubber sheet. The automobile-used multifunctional damping rubber sheet comprises an adhesive reinforcing rubber layer (2), a damping rubber layer (1) arranged on the upper surface of the reinforcing rubber layer (2) and an anti-sticking layer (3) arranged on the lower surface of the reinforcing rubber layer (2). The preparation method of the automobile-used multifunctional damping rubber sheet comprises the following steps: (1) preparing the damping rubber layer; (2) preparing the reinforcing rubber layer; (3) bonding the damping rubber layer onto the upper surface of the reinforcing rubber layer and bonding release paper on the upper surface of the reinforcing rubber layer to form the final product. The automobile-used multifunctional damping rubber sheet combines damping and reinforcing together, meanwhile, has the using functions of first and second categories of engineering materials, can be mounted in two environments at normal temperature or after high temperature and used in various vehicle environments, is excellent in performance, environment-friendly, and convenient to use, and has multiple functions.

Description

technical field [0001] The invention belongs to the field of preparation of automobile NVH engineering materials, and in particular relates to a multifunctional damping film for automobiles and a preparation method thereof. Background technique [0002] Automotive NVH (vibration, noise, comfort) engineering, including the use of damping methods to control vibration and suppress noise. There are two types of engineering materials usually used: one is the damping film for automobiles. There are two types of materials that are often used. Models, namely hot-melt type and magnetic suction type, and the other type is reinforcing film for automobiles. These materials use hot-melt or thermosetting methods to attach products to body panels to control vibration and suppress noise. The hot-melt type in the first category is used for flat parts such as the body floor, and the damping film is attached to the steel plate by heating and melting; the magnetic suction type in the first cate...

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Problems solved by technology

[0003] 1. The first type of products need to be baked at high temperature during installation, and volatile organic compounds will be precipitated after some materials are baked, polluting the workshop environment. For magnetic material products, there is a problem of residual magnetism, and the magnetic function of the product is only used in the baking process. The time is 30 minutes. After baking, the magnetism is useless, but the residual magnetism is useless and difficult to remove. It is reported that the magnetic field of the residual magnetism will also pollute the environment inside the car. The natural attenuation of the residual magnetism takes quite a long time. The density of magnetic products is 2.5-2.7, which is about 40% higher than that of ordinary materials, which is not conducive to the lightweight of automotive products

[0004] 2. The biggest problem in the use of magnetic material products is that they are prone to foaming after baking. This is a common problem in the industry. The mechanism of foaming is not very clear. It is generally believed to be caused by the uneven distribution of magnetic powder in the product. There are still many problems in the improvement of

[0005] 3. The second type of reinforcing film for automobiles, the product hardens after baking, which enhances the strength of the steel plate at the additional part, but the damping coefficient is very low, generally on the order of 0.03, which is more than 70% lower than ordinary damping materials. Enhanced and reduced damping; the baking temperature of this type of product is 170 ° C ~ 180 ° C, and it needs to be installed before the electrophoresis of the body, and the parts covered by the product may not be electrophoresed, and there is a risk of corrosion on the body panels

However, the product does not give the installation conditions. If it is installed at room temperature, the damping coefficient may be realized, but the shear strength and reinforcement ratio are difficult to achieve. If it is installed under baking, the shear strength and reinforcement ratio may be possible. Realized, but the damping coefficient is difficult to achieve. At this time, the material is very hard, so the product is essentially a single-function damping film (installed at room temperature) or reinforcing film (after baking). High damping and high reinforcement cannot be achieved at the same time. , failed to achieve multi-functionality

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