Chengdu property protection wall material

Theoretically, any material (substance) has different degrees of shock absorption, sound insulation and sound absorption, even a piece of paper or cloth. The effective ways to block noise transmission mainly include sealing, shock prevention, sound insulation and sound absorption. On the basis of shock absorption, sound insulation, sound absorption and sealing treatment can achieve a quiet and comfortable effect. In the process of vehicle sound insulation and noise reduction, the sound absorption performance of the sound insulation products used will directly affect the noise reduction effect.

Vehicle noise reduction products are divided into four categories: A, shock absorption material B, sound absorption material C, sound insulation material D and sealing material. From the development trend of lightweight, the ideal vehicle sound insulation material is definitely not a single paste of shock absorption, sound insulation and sound absorption products, but a comprehensive application of these sound insulation principles by a product.

The sound insulation and noise reduction materials used in automobiles shall meet the following standards as far as possible:

Lightweight materials are the general trend of the whole automobile manufacturing field. Light materials will not increase the weight of the car body too much, and will not increase fuel consumption after construction.

It has good sound insulation and sound absorption performance in a wide frequency band, and the sound insulation and sound absorption performance is stable and reliable for a long time.

It has certain strength, is not easy to be damaged and aged during installation and use, and has long service life.

The appearance is clean and pollution-free.

Moisture-proof, waterproof, corrosion-resistant and moth-proof, not easy to mold.

It's not easy to burn, so it's better to be fireproof and flame retardant.

Environmentally friendly materials, free of harmful substances such as asbestos, glass fiber and heavy metal lead.

The material itself is convenient for construction, such as easy cutting and firm pasting.

First of all, sponge

Advantages: Sponge is a sound-absorbing material with excellent performance, otherwise it will not be widely used in recording studios. Sponges with sound-absorbing grooves on the surface have better sound-absorbing effect! This sponge is commonly known as wave cotton. Disadvantages: the sponge has poor shock absorption and sound insulation performance.

Disadvantages: strong water absorption, easy to absorb dust, rainy days or after car washing, the car body is greatly increased, which is easy to rust! In addition, the sponge without special treatment has poor fire resistance and is generally not flame retardant.

Not recommended!

Second, the asphalt slab

Advantages: The asphalt slab originally used in the building has good waterproof, shock absorption and sound insulation effects.

Disadvantages: poor high temperature resistance, no flame retardant, heavy weight and pollution.

Not recommended!

Three, fiber carpet, industrial carpet

Now many car manufacturers use this material on their production lines. You can see it in your car. It's just that this material can be used on the floor and ceiling of a car, but not in other parts. You can see that the front floor and ceiling of Huapu and Li Xia cars, the interior trim of trunk and the front floor of Guangben 3.0 are also used.

Advantages: low cost.

Disadvantages: the shock absorption effect is general, although it has certain sound absorption and sound insulation ability, it is not waterproof, fireproof and anticorrosive.

Not recommended!

Fourth, glass fiber cotton.

Advantages: good sound absorption, thermal insulation, non-spontaneous combustion, anti-corrosion and moisture-proof.

Disadvantages: it has strong water absorption and looks like aluminum silicate cotton, but it is not environmentally friendly. It has been gradually eliminated in the industrial field, but some construction shops still use it, and some protective pads for range hoods are made of it. Loose fibers are easy to pollute the environment; There are pores in it, which are connected with each other, so water vapor can easily soak in. If individual products are damaged, it will lead to pollution and pose a threat to health.

Not recommended!

Five, sound-absorbing coatings

Gray-black liquid used for spraying.

Advantages: For the parts where it is inconvenient to paste sound insulation materials, spraying materials can be used.

Disadvantages: the sound absorption and sound insulation effect is average, and the shock absorption ability after multi-layer painting is ok.

Can be used.

Six, foam expansion agent

Scientific name polyurethane, white and yellowish.

Advantages: the shock absorption and sound insulation effect is acceptable, and it is often used for sound insulation of A, B and C columns. Commonly used in construction and thermal insulation industries.

Disadvantages: the sound absorption effect is average. After being used in vehicles, it will bring inconvenience to future maintenance. Some have fire prevention ability, do not absorb water, and have high price and fire prevention ability.

Can be used.

Seven, lead plate composite materials

Generally black in appearance, it consists of two kinds of foam materials and a layer of lead plate with a lead plate in the middle, which generally does not attract attention and is often used in the construction of vehicle floor parts.

Advantages: it can obviously restrain the noise in the middle and low frequencies and is convenient for construction.

Disadvantages: not environmentally friendly. Long-term exposure to heavy metal lead can easily lead to chronic lead poisoning, especially for pregnant women and young children. Heavy materials affect acceleration performance and increase fuel consumption.

Not recommended!

Eight, butyl rubber sound insulation and vibration isolation plate.

Butyl rubber as the main raw material, covered with a layer of aluminum foil, commonly known as sound insulation and vibration prevention board.

Advantages: butyl rubber has excellent sound insulation and vibration reduction effect, is environment-friendly and has long service life. Aluminum foil material can not only block thermal radiation, but also greatly increase strength. At present, the best sound insulation and vibration reduction materials on the market can be applied to doors, trunks, floors, hoods, fenders, ceilings, firewalls and other parts.

Disadvantages: high cost of raw materials.

Highly recommended! (Double precision, daylight saving time, Boya, etc. )

Nine, sound-absorbing cotton

Advantages: Good sound absorption and heat insulation performance, which can not only absorb external noise, but also reduce the penetration of external heat. When it is used in combination with the sound insulation and vibration prevention plate made of butyl rubber, better noise elimination effect can be obtained. At the same time, it has good resilience and flexibility, and can be widely used in the friction contact parts between some parts and decorative plates (such as rear partition plates) to eliminate the noise generated therefrom.

Disadvantages: poor vibration reduction effect, certain water absorption, not suitable for wet and strong vibration parts (such as car doors).