First, let me tell you how to test the sound insulation effect:
The test method of sound insulation effect is to play music normally in a room and measure the attenuation of sound at the entrance one meter away. For example, the indoor sound pressure level is 90dB, and the outdoor sound pressure level is 60dB, that is, the sound insulation is 30dB. The treatment of room door is also a difficult problem in decoration design. The treatment of the recording studio door is very professional, and the sound insulation effect is good, but the cost is very high. Usually, the price of a soundproof door ranges from four to five thousand yuan to more than ten thousand yuan. At present, it is more practical to adopt the method of integrated door molding and adding sealing strips at the door edge, and the sound insulation effect with door closers is not bad.
The first choice is sound insulation wallboard, which is a professional sound insulation material, with metal plates on both sides and foam plastic with sound insulation effect in the middle. The greater the thickness of this wallboard, the better the sound insulation effect. In some places, due to bearing problems, brick walls or other masonry methods cannot be used, and only light steel keel gypsum boards can be used.
Secondly, it is economical and practical to use 2/4 red brick walls and cement walls on both sides. This partition must be built to the top, and holes need to be punched when ventilation pipes or other routes are needed. Pay attention to the sealing of the pipeline, otherwise it will also cause crosstalk.
Our suggestion is to stick a layer of cement board with higher hardness outside the gypsum board. This cement board has the same appearance (similar size) as gypsum board, but its hardness is much higher than gypsum board, so it is a good sound insulation material. Attention should be paid to the construction technology, especially the gap must be sealed.
Disruptor with mild noise for a long time will affect the sleep quality of nearby residents, and in severe cases, it may lead to the decline of patients' quality of life and even affect patients' health. A sound barrier can provide a quiet environment for users who are disturbed by noise.
Related reading recommendations:
The state stipulates that most families must use safety noise barriers.
Blue Sound Insulation Company's sound barrier is outstanding in performance.
Install the most suitable soundproof door for every household affected by noise.
Advantages of sponge: sponge is a kind of sound-absorbing material with very good performance, otherwise it will not be widely used in recording studio. 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. Strong water absorption, easy to absorb dust, rainy days or after car washing, the car body is greatly increased, which is easy to cause rust! In addition, the sponge without special treatment has poor fire resistance and is generally not flame retardant.
The modified sponge is actually a sponge. Two years ago, in order to solve the water absorption problem of sponge, the automobile sound insulation and noise reduction net specially treated the sponge, and a layer of black plastic film was attached to one side of the sponge, which solved the water absorption problem, but the sound absorption ability was much worse. In addition, the sponge itself is weak in shock absorption, so it is abandoned. At present, there are people in the market who stick stickers and foreign brands, but in fact they sell nearly 100 yuan a square meter. Self-adhesive for sound insulation materials is unscientific.
The asphalt slab originally used for asphalt slab construction has good waterproof, shock absorption and sound insulation effects. Just can't flame retardant, heavy, pollution. Two years ago, Mr. Bird of Paradise recommended many riders to use it. Later, it was found that a modified asphalt board made in Shandong was flame retardant and environmentally friendly, and it could be pasted with a layer of aluminum foil on one side when leaving the factory, which was more beautiful. Although materials need to be heated during construction, the effect is good. Advantages: cheap. Disadvantages: heavy weight and poor sound absorption effect. Asphalt slabs are added under the floor of Outlander, and the A, B and C columns of the car body are filled with ethylene foam for sound absorption and noise reduction.
Because of the different components of raw materials, the physical properties of rubber sheets are very different. For example, there are great differences in surface smoothness, hardness, fire resistance and plasticity. But generally speaking, ordinary rubber has weaker shock absorption and stronger sound insulation than asphalt board. Disadvantages are heavy weight, poor sound absorption effect and difficult construction.
Fiber carpets and industrial carpets are now used in production lines by many automobile manufacturers, and you can see them in most of your cars. It's just that this material can be used on the floor and ceiling of a car, but not in other parts. 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. 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.
Hemp wool is cheap and rich in raw materials. Poor fireproof and moisture-proof performance. It is used in some parts of cars in China.
Aluminum silicate cotton is white or light yellow, soft as cotton, with poor fire resistance, water absorption and dirt resistance. Strong ability to absorb high-frequency noise and poor sound insulation effect. Harmful to human body, not environmentally friendly.
Petroleum fiber cotton is white, soft as cotton, melts in fire, has poor water absorption capacity and is not resistant to dirt. Strong ability to absorb high-frequency noise and poor sound insulation effect.
Glass fiber cotton has good sound absorption, water absorption, heat insulation, non-spontaneous combustion, corrosion resistance and moisture resistance. The appearance is similar to that of aluminum silicate cotton, but it is not environmentally friendly. It has been gradually eliminated in the industrial field, but it is still used in some construction shops, and some protective mats 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. The old Cherokee co-pilot has a small amount of use under the mat.
Industrial plastic board is black, soft, waterproof and has certain fire resistance. It is mostly used in thermal insulation equipment or air conditioning industry in construction industry. Advantages: strong sound insulation and shock absorption, and low price. Insufficient: no sound absorption ability. It smells. At present, it is used by a few riders and some car soundproof storefronts, and there are also products with self-adhesive (back glue). The price is slightly higher, and a small amount can be coated on the bottom plate. The rest is easy to stick or fall off, so be careful.
Advantages of foamed silica gel board: soft, nonflammable, waterproof, moderate weight and environmental protection. Good sound insulation and shock absorption effect and long service life. Insufficient: the sound absorption performance is average. The cost is too high: raw materials alone cost more than 90 yuan per kilogram, so the cost performance is not high.
The sound-absorbing coating is gray-black liquid and sprayed. The sound absorption and insulation effect is average, but the shock absorption ability after multi-layer brushing is ok.
Polyurethane, the scientific name of polystyrene foam, is yellow in white, and some of it has fire prevention ability, which does not absorb water and has fire prevention ability at a higher price. Commonly used in construction and thermal insulation industries. The shock absorption and sound insulation ability is ok, and the sound absorption effect is average. After being used on the vehicle, it will bring inconvenience to future maintenance. Many netizens of the sound insulation and noise reduction network will use it when dealing with A, B and C columns.
Most of the common aluminum foil composite materials in the market are brand-free. Made of aluminum foil and sponge or multi-fiber material, with adhesive on the other side. Mostly used for sound insulation and protection of range hoods. Advantages: light weight and good reflection performance for sound waves. Insufficient: the composite layer generally absorbs water; Poor fire protection performance; The aluminum foil layer reflects a lot of heat energy to the engine and adjacent lines, which is not conducive to engine heat dissipation and is easy to accelerate line aging; Self-adhesion is easy to get sticky and fall off at high temperature.
The sound insulation felt is made of iron powder, PVC or asphalt, which is moisture-proof and moth-proof. It is a flame-retardant product and is often used in water pipe wrapping, wall sticking and other construction fields. Good sound insulation performance, no sound absorption ability.
Polyurethane foam is the main component of foamed rubber. The cured polyurethane foam material can play a good role in sound insulation, sound absorption, corrosion prevention and waterproof, and the better polyurethane material has flame retardant design. But the sound absorption performance is unstable. Most vehicle seats are made of this material. There are many polyurethane sound insulation and sound absorption materials under the back seat of China car, and a little is also used for the door interior panel of Guangben 3.0.
Most peak sponges or rubber products release toxic substances at high temperature, and the modified products have certain flame retardancy. It is not waterproof and easy to vacuum, and it is easier to hide dirt and accept dirt after soaking in water or being wet. It has good sound absorption performance. Sponge material has almost no sound insulation performance, and its thickness is generally 3CM or even thicker, which is not suitable for suppressing automobile noise. It is often used as a wall sound absorption material for cinemas, recording studios and KTV.
Steady sound-proof and sound-absorbing cotton takes industrial rubber and plastic as the main carrier, adding various specifications of sound-proof particles, nitrogen foaming and molding, and has a gray-black appearance. The most distinctive feature is the design of special-shaped sound-absorbing groove for automobile noise. Fireproof and waterproof, soft and elastic, and the bottom is glued to stop vibration; The front face is covered with miniature sound-absorbing holes and special-shaped sound-absorbing grooves, which effectively filter noises of different frequencies and wavelengths. It integrates the functions of shock absorption, sound insulation and sound absorption, meets all the requirements of lightweight and environmental protection of vehicle noise reduction materials, and has high cost performance.