WO2017140097A1

WO2017140097A1 - Composite expanded polytetrafluoroethylene film-polyurethane foam surface full-frequency band strong sound-absorption sheet and preparation method therefor

Info

Publication number: WO2017140097A1
Application number: PCT/CN2016/096302
Authority: WO
Inventors: 张云; 丁荣华
Original assignee: 江苏泛亚微透科技股份有限公司
Priority date: 2016-02-15
Filing date: 2016-08-22
Publication date: 2017-08-24
Also published as: CN105835503A

Abstract

Provided are a composite expanded polytetrafluoroethylene film-polyurethane foam surface full-frequency band strong sound-absorption sheet and a preparation method therefor. The sheet comprises an expanded polytetrafluoroethylene microporous film layer (1) and a polyurethane foam layer (3), wherein a single surface or both surfaces of the polyurethane foam layer (3) are compounded with the expanded polytetrafluoroethylene microporous film layer (1), a bonding layer (2) is arranged between the expanded polytetrafluoroethylene microporous film layer (1) and the polyurethane foam layer (3), and the expanded polytetrafluoroethylene microporous film layer (1) has a thickness of 0.003-0.02 mm. The sheet can reduce noise fatigue-caused accidents and improve the international trade competitiveness for engineering machinery products.

Description

Sheet with composite sound absorption of expanded polytetrafluoroethylene film and polyurethane foam surface and preparation process thereof

Technical field

The invention relates to the field of sound absorbing materials, in particular to a sheet and a preparation process for combining a bulk polytetrafluoroethylene film and a polyurethane foam surface to absorb sound in a full frequency band.

Background technique

At present, the noise emission level of China's construction machinery (excavators, roadheaders, automobile engine compartments and their enclosures) is still far from the world's construction machinery manufacturing powers, and it is difficult for products to enter the markets of these developed regions in batches. Therefore, reducing construction machinery noise is of great significance for safe driving, noise and environmental protection, and the hearing health of operators, and improving the market competitiveness of construction machinery products. Due to the harsh working conditions of the construction machinery, the vibration of the power and working equipment (engine, hydraulic, mechanical transmission system, etc.), strong vibration and noise are generated during operation. With the construction of large-scale projects, engineering machinery is becoming more and more complex, large-scale and high-speed development. The vibration and noise problems are more prominent. The construction noise has become one of the main noise sources in the city. It is very harmful to people and construction machinery and equipment. It not only pollutes the environment, but also affects people's daily life. In serious cases, it may cause engineering accidents. Analyze the spectrum of these noise sources such as engines, hydraulic transmission systems, and cooling fans, and the energy in the low, medium, and high frequency bands. At present, the micro-perforated plate resonance sound absorption structure and polymer material (ordinary polyurethane foam or sound insulation cotton) are generally used for sound absorption and noise reduction. The noise reduction effect of these two types is generally high, and the noise of construction machinery is still above 85dB. Meeting the latest noise limit standards in Europe and the GB16710-2010 earthmoving machinery noise limit standards are not conducive to expanding the foreign product market.

Summary of the invention

The technical problem mainly solved by the invention is to provide a sheet of a composite polytetrafluoroethylene film and a polyurethane foam surface combined with a strong sound absorption sheet and a preparation process thereof, which can control the noise pollution of various frequency bands generated by the engineering machine, so that people Pleasant work in a good environment, reducing accidents caused by noise fatigue.

In order to solve the above technical problem, a technical solution adopted by the present invention is to provide an expanded polytetrafluoroethylene film and a poly The urethane foam surface is combined with a full-band strong sound absorbing sheet, comprising: an expanded polytetrafluoroethylene microporous film layer and a polyurethane foam layer, and the polyurethane foam layer has a single-sided or double-sided composite with expanded aggregate a tetrafluoroethylene microporous film layer, a bonding layer is disposed between the expanded polytetrafluoroethylene microporous film layer and the polyurethane foam layer, and the thickness of the expanded polytetrafluoroethylene microporous film layer is 0.003- 0.02mm.

In a preferred embodiment of the invention, the bonding layer is an adhesive layer or a hot-melt powder bonding layer.

In a preferred embodiment of the invention, the polyurethane foam layer has a thickness of from 12 to 20 mm.

In order to solve the above technical problem, another technical solution adopted by the present invention is to provide a preparation process of a sheet of a bulky polytetrafluoroethylene film and a polyurethane foam surface combined with a full-range sound absorbing sound, comprising the following steps:

1) First, the process preparation is performed, and the polyurethane foam and the expanded polytetrafluoroethylene microporous film are unwound;

2) laying a binder on the polyurethane foam;

3) The expanded polytetrafluoroethylene microporous film is covered on the adhesive, and is heated and rolled to make the two adhere firmly;

4) After the inspection is passed, the sheet is obtained by winding up.

In a preferred embodiment of the invention, the process for preparing the expanded polytetrafluoroethylene microporous film comprises the following steps:

1) mixing the polytetrafluoroethylene dispersion resin with the liquid auxiliary agent, and incubating at a temperature of 32 ° C to 40 ° C;

2) after the aging, the mixed product is pressed into a cylindrical blank, and then the cylindrical blank is sliced by calendering;

3) After heating, the auxiliary agent on the sheet is removed, and then the sheet is subjected to unidirectional longitudinal stretching and wide-direction biaxial stretching;

4) The film formed by stretching is heat-set, and after cooling, winding is performed to obtain an expanded polytetrafluoroethylene microporous film.

In a preferred embodiment of the invention, the heating in step 3) is to heat the hot air temperature to 100-120 ° C, the sheet passes through a hot wind field speed of 1-3 m/min, and the heating time is 3-8 min.

In a preferred embodiment of the present invention, in the step 3), the stretching ratio in the longitudinal direction is 3-8 times, and the stretching ratio in the wide biaxial direction is 10-25 times.

In a preferred embodiment of the present invention, in the step 4), the heat setting is performed by placing the film formed by stretching in an infrared heated air at a setting temperature of 350 to 420 °C.

In a preferred embodiment of the invention, the binder is an adhesive or a hot melt powder

In a preferred embodiment of the invention, the drum is heated at a temperature of 120-150 ° C when heated and rolled, and the sheet composite moving speed is 2-5 m/min.

The invention has the beneficial effects that the invention has excellent effects in controlling noise pollution in various frequency bands generated by engineering machinery, enables people to work happily in a good environment, reduces accidents caused by noise fatigue, and improves international trade competition of engineering machinery products. Important new material guarantees for force.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained according to these drawings without any creative work, wherein:

1 is a schematic structural view of a preferred embodiment of a composite sheet of a bulky polytetrafluoroethylene film of the present invention and a polyurethane foam surface;

2 is a schematic structural view of another preferred embodiment of a composite sheet of a bulky polytetrafluoroethylene film of the present invention and a surface of a polyurethane foam composited with strong sound absorption;

Fig. 3 is a graph showing the properties of a sheet which is strongly absorbing sound in the full-band of the expanded polytetrafluoroethylene film of the present invention and the surface of the polyurethane foam.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Please refer to Figure 1 and Figure 2:

Embodiment 1: a sheet of a bulky polytetrafluoroethylene film and a polyurethane foam surface combined with a full-range strong sound absorbing sheet, comprising: an expanded polytetrafluoroethylene microporous film layer 1 and a polyurethane foam layer 3, The single or double sided composite of the polyurethane foam layer 3 has Expanded polytetrafluoroethylene microporous film layer 1.

An adhesive layer 2 is provided between the expanded polytetrafluoroethylene microporous film layer 1 and the polyurethane foam layer 3, and the adhesive layer 2 is preferably an adhesive layer as the adhesive layer 2.

The expanded polytetrafluoroethylene microporous film layer 1 has a thickness of 0.003 mm. The polyurethane foam layer 3 has a thickness of 12 mm.

Polyurethane foam has excellent impact and shock resistance, uniform micro-cellular micro-cavity and high repulsive force inside, high dimensional stability and excellent dimensional stability, free of contaminating chemical and deformable plasticizer It will not pollute other contact materials, maintain high physical properties, produce no corrosive gas, and have a general sound absorption effect.

The porous material constitutes a fine, interconnected multi-layer shaped aperture cavity which is formed by a porous cavity. When a noise wave is transmitted into the microcavity, the microporous cavity generates more air molecules and microfibers vibrating in the hole. The large viscous drag and friction force cause the vibrational kinetic energy of the molecule to be converted into thermal energy and the sound energy is sharply attenuated sharply. The greatly attenuated noise wave is followed by a uniform micro-cellular micro-cavity inside the polyurethane foam. The inside is further attenuated into heat energy.

Therefore, the combination of the microporous membrane of the expanded polytetrafluoroethylene high-performance fiber and the polyurethane foam has exhibited excellent sound absorption and noise reduction capability, and the microporous film experiment shows that the noise reduction in the whole frequency band is better. .

The invention also relates to a preparation process of a sheet of a bulky polytetrafluoroethylene film and a polyurethane foam surface combined with a full-range sound absorbing sound, comprising the following steps:

2) laying an adhesive on the polyurethane foam;

3) The expanded polytetrafluoroethylene microporous film is covered on the adhesive, and is heated and rolled to make the two sheets adhere firmly. When the heating is rolled, the heating temperature of the drum is 120 ° C, and the composite moving speed of the sheet is 2 m/min.

4) After the inspection is passed, the sheet is obtained by winding up.

The preparation process of the expanded polytetrafluoroethylene microporous film comprises the following steps:

1) mixing the polytetrafluoroethylene dispersion resin and the liquid auxiliary agent in a weight ratio of 5:1, and incubating at a temperature of 32 ° C;

Wherein, the heating is to heat the hot air temperature to 100 ° C, the sheet passes the hot wind field speed of 1 m / min, and the heating time is 3 min;

The longitudinal stretching ratio is 3 times, and the wide biaxial stretching ratio is 10 times;

4) The film formed after stretching is heat-set, and after cooling, winding is performed to obtain an expanded polytetrafluoroethylene microporous film;

Among them, the heat setting is to place the film formed after stretching into an infrared heated air at a setting temperature of 350 ° C.

Embodiment 2: a sheet of a bulky polytetrafluoroethylene film and a polyurethane foam surface combined with a full-range strong sound absorbing sheet, comprising: an expanded polytetrafluoroethylene microporous film layer 1 and a polyurethane foam layer 3, The expanded polytetrafluoroethylene microporous film layer 1 is laminated on one side or both sides of the polyurethane foam layer 3.

An adhesive layer 2 is provided between the expanded polytetrafluoroethylene microporous film layer 1 and the polyurethane foam layer 3, and the adhesive layer 2 is preferably a hot melt powder as the adhesive layer 2.

The expanded polytetrafluoroethylene microporous film layer 1 has a thickness of 0.01 mm. The thickness of the polyurethane foam layer 3 was 16 mm.

2) arranging hot melt powder on the polyurethane foam;

3) The expanded polytetrafluoroethylene microporous film is covered on the hot-melt powder, and is heated and rolled to make the two sheets adhere firmly. When the heating is rolled, the heating temperature of the drum is 134 ° C, and the composite moving speed of the sheet is 3 m/min.

4) After the inspection is passed, the sheet is obtained by winding up.

1) mixing the polytetrafluoroethylene dispersion resin and the liquid auxiliary agent in a ratio of 7:2 by weight, and incubating at a temperature of 36 ° C;

Wherein, the heating is to heat the hot air temperature to 110 ° C, the sheet passes the hot wind field speed of 2 m / min, and the heating time is 5 min;

The longitudinal stretching ratio is 5 times, and the wide biaxial stretching ratio is 20 times;

Among them, the heat setting is to place the film formed after stretching into an infrared heated air at a setting temperature of 380 ° C.

Embodiment 3: a sheet of a bulky polytetrafluoroethylene film and a polyurethane foam surface combined with a full-range sound absorbing sheet, comprising: an expanded polytetrafluoroethylene microporous film layer 1 and a polyurethane foam layer 3, The expanded polytetrafluoroethylene microporous film layer 1 is laminated on one side or both sides of the polyurethane foam layer 3.

The expanded polytetrafluoroethylene microporous film layer 1 has a thickness of 0.008 mm, and the polyurethane foam layer 3 has a thickness of 15 mm.

2) arranging hot melt powder on the polyurethane foam;

3) The expanded polytetrafluoroethylene microporous film is covered on the hot-melt powder, and is heated and rolled to make the two sheets adhere firmly. When the heating is rolled, the heating temperature of the drum is 110 ° C, and the composite moving speed of the sheet is 4 m/min.

4) After the inspection is passed, the sheet is obtained by winding up.

1) mixing the polytetrafluoroethylene dispersion resin and the liquid auxiliary agent in a weight ratio of 5:1, and incubating at a temperature of 38 ° C;

Wherein, the heating is to heat the hot air temperature to 108 ° C, the sheet passes the hot wind field speed of 3 m / min, and the heating time is 6 min;

The longitudinal stretching ratio is 4 times, and the wide biaxial stretching ratio is 18 times;

Among them, the heat setting is to place the film formed after stretching into an infrared heated air at a setting temperature of 400 ° C.

Example 4: An expanded polytetrafluoroethylene film and a polyurethane foam surface are combined with a full-range strong sound absorbing sheet, including: The expanded polytetrafluoroethylene microporous film layer 1 and the polyurethane foam layer 3 are laminated on one side or both sides of the polyurethane foam layer 3 with an expanded polytetrafluoroethylene microporous film layer 1.

The expanded polytetrafluoroethylene microporous film layer 1 has a thickness of 0.02 mm. The thickness of the polyurethane foam layer 3 was 20 mm.

2) laying an adhesive on the polyurethane foam;

3) The expanded polytetrafluoroethylene microporous film is covered on the adhesive, and is heated and rolled to make the two sheets adhere firmly. When the heating is rolled, the heating temperature of the drum is 150 ° C, and the composite moving speed of the sheet is 5 m/min.

4) After the inspection is passed, the sheet is obtained by winding up.

1) mixing the polytetrafluoroethylene dispersion resin and the liquid auxiliary agent in a weight ratio of 5:1, and at a temperature Heated and cooked in an environment of 40 ° C;

Wherein, the heating is to heat the hot air temperature to 120 ° C, the sheet passes the hot wind field speed of 3 m / min, and the heating time is 8 min;

The longitudinal stretching ratio is 8 times, and the wide biaxial stretching ratio is 25 times;

Among them, the heat setting is to place the film formed after stretching in an infrared heated air at a setting temperature of 420 ° C.

In summary, the expanded polytetrafluoroethylene film and the polyurethane foam surface are combined with the full-range sound-absorbing sheet, which greatly reduces the noise level of the construction machinery in China, the expanded polytetrafluoroethylene film and the polyurethane foam surface. The composite full-band sound-absorbing sheet will upgrade the engineering machinery products, and the new composite materials will enhance the competitiveness of construction machinery products in international trade.

The development test method of the invention is: combining the expanded polytetrafluoroethylene film of different thickness with the polyurethane by hot melt powder or adhesive, according to GB/T 18696.2-2002 (ISO 10534-2:1998) "acoustic impedance tube Measurement of middle sound absorption coefficient and sound impedance Part 2 Transfer function method" Sample preparation and measurement of sound absorption coefficient, and found that the sound absorption coefficient of each frequency band is excellent combination material, and it is determined that the noise of each frequency band of the construction machine has strong sound absorption and noise reduction. The thickness range of the expanded polytetrafluoroethylene film. (Not all expanded polytetrafluoroethylene films of all thickness have strong sound absorption, especially medium and high frequency noise waves sensitive to human ears).

Standing wave tube test instrument features:

SKC's Z-Series impedance tube is used to determine the sound absorption coefficient of sound absorbing materials under normal incidence conditions. The whole system consists of standing wave tube, high-end microphone, data acquisition card, computer and so on. The tester software automatically calculates the sound absorption coefficient based on the measured peak sound level value and valley sound level value, and can generate a coordinate curve of the sound absorption coefficient and the frequency. The frequency and amplitude of the instrument output signal can be set freely within the specified range. Since only a small amount of sound absorbing material is required as a test piece, it is particularly suitable for parameter research and design of sound absorbing materials. Z series impedance tube system is tested according to national standard GB/T18696.2-2002 "Measurement of sound absorption coefficient and acoustic impedance acoustics in impedance tube Part 2: Transfer function method" and ISO10534-2:1998, test common building sound absorbing materials, Sound absorption coefficient of various materials such as automotive interior materials and industrial sound absorbing materials. Relative to the standing wave ratio method of the standing wave tube, the test time is short, The spectrum is continuous and reproducible. Especially when conducting material research, the efficiency of the contrast experiment can be greatly improved.

Figure 3 and Table 1 are the performance data and graphs of the sheet with the strong sound absorption of the expanded polytetrafluoroethylene film and the polyurethane foam surface.

Table 1

The above test parameter chart shows that the composite material of the expanded polytetrafluoroethylene film and polyurethane has a high sound absorption coefficient in each frequency band, which is much higher than the requirements of Volkswagen, and the sound absorption coefficient of the sheet has a world leading level.

The invention is beneficial to the lightweight of engineering machinery vehicles and has excellent sound absorption and noise reduction capability; no new weight is added, and energy saving and environmental protection compliance conditions are created for realizing light weight of engineering machinery; surface anti-pollution ability is strong against ultraviolet and weathering It is suitable for construction machinery in harsh weather conditions, and can fully exert the effect of strong sound absorption and sound insulation.

It has excellent effects in controlling noise pollution in various frequency bands generated by engineering machinery, making people work happily in a good environment, reducing accidents caused by noise fatigue, and improving important new material guarantees for the competitiveness of international trade in construction machinery products.

The above is only the embodiment of the present invention, and thus does not limit the scope of the patent of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification of the present invention, or directly or indirectly applied to other related technical fields, The same is included in the scope of patent protection of the present invention.

Claims

A sheet of expanded polytetrafluoroethylene film and polyurethane foam surface combined with a full-range strong sound absorption sheet, characterized by comprising: an expanded polytetrafluoroethylene microporous film layer and a polyurethane foam layer, the polyurethane foam The single-sided or double-sided composite layer of the cotton layer is combined with an expanded polytetrafluoroethylene microporous film layer, and an adhesive layer is disposed between the expanded polytetrafluoroethylene microporous film layer and the polyurethane foam layer, and the expanded body The thickness of the polytetrafluoroethylene microporous film layer is 0.003-0.02 mm.
The sheet of the expanded polytetrafluoroethylene film according to claim 1 and the surface of the polyurethane foam are combined to absorb sound in the full range, wherein the adhesive layer is an adhesive layer or a hot-melt powder bonding layer.
The expanded polytetrafluoroethylene film according to claim 1 and the polyurethane foam surface are combined with a full-range strong sound absorbing sheet, wherein the polyurethane foam layer has a thickness of 12-20 mm.
The invention discloses a process for preparing a full-band strong sound absorbing sheet of the expanded polytetrafluoroethylene film and the polyurethane foam surface according to claim 1, which comprises the following steps:

1) First, the process preparation is performed, and the polyurethane foam and the expanded polytetrafluoroethylene microporous film are unwound;

2) laying a binder on the polyurethane foam;

3) The expanded polytetrafluoroethylene microporous film is covered on the adhesive, and is heated and rolled to make the two adhere firmly;

4) After the inspection is passed, the sheet is obtained by winding up.
The method for preparing a full-band strong sound absorbing sheet of the expanded polytetrafluoroethylene film and the polyurethane foam surface according to claim 4, wherein the preparation process of the expanded polytetrafluoroethylene microporous film comprises the following step:

1) mixing the polytetrafluoroethylene dispersion resin with the liquid auxiliary agent, and incubating at a temperature of 32 ° C to 40 ° C;

2) after the aging, the mixed product is pressed into a cylindrical blank, and then the cylindrical blank is sliced by calendering;

3) After heating, the auxiliary agent on the sheet is removed, and then the sheet is subjected to unidirectional longitudinal stretching and wide-direction biaxial stretching;

4) The film formed by stretching is heat-set, and after cooling, winding is performed to obtain an expanded polytetrafluoroethylene microporous film.
The process for preparing a expanded polytetrafluoroethylene microporous film according to claim 5, wherein the heating in the step 3) is to heat the hot air temperature to 100-120 ° C, and the expanded polytetrafluoroethylene flakes pass through the hot wind field. The speed is 1-3m/min and the heating time is 3-8min.
The process for preparing a expanded polytetrafluoroethylene microporous film according to claim 5, wherein in the step 3), the stretching ratio in the longitudinal direction is 3-8 times, and the stretching ratio in the wide biaxial stretching is 10-25. Times.
The process for preparing an expanded polytetrafluoroethylene microporous film according to claim 5, wherein in the step 4), the heat setting is performed by placing the film formed by stretching in an infrared heated air at a setting temperature of 350-420 ° C.
The composite polytetrafluoroethylene film according to claim 4 is combined with the surface of the polyurethane foam A process for preparing a sheet of strong sound absorption, characterized in that the binder is an adhesive or a hot melt powder.
The invention discloses a process for preparing a full-band strong sound absorbing sheet of the expanded polytetrafluoroethylene film and the polyurethane foam surface according to claim 4, wherein the heating temperature of the drum is 120-150 ° C during heating and rolling, and the sheet is used. The composite moving speed is 2-5m/min.