CN111004486B

CN111004486B - Super-hydrophobic self-luminous sound insulation screen and construction method

Info

Publication number: CN111004486B
Application number: CN201911148920.7A
Authority: CN
Inventors: 杨则英; 单煜辉; 刘耕; 赵庆伟; 赵凤金; 张鹏; 曲建波; 程可秀; 王浩; 侯和涛; 田利; 武科; 祁文超
Original assignee: Shandong University
Current assignee: Shandong University
Priority date: 2019-11-21
Filing date: 2019-11-21
Publication date: 2021-06-29
Anticipated expiration: 2039-11-21
Also published as: CN111004486A

Abstract

The invention relates to a super-hydrophobic self-luminous sound-proof screen and a preparation method thereof. The sound-proof screen comprises a sound-proof screen and a super-hydrophobic layer, wherein the super-hydrophobic layer is coated on the surface of the sound-proof screen, the sound-proof screen comprises polycarbonate resin, luminescent powder, reflective powder, kaolin, a water reducing agent and water, and the luminescent powder is K₂SiF₆:Mn₄ ⁺. The sound insulation screen comprises 900 parts of polycarbonate resin, 75-80 parts of luminescent powder, 30-40 parts of reflective powder, 15-20 parts of kaolin, 10 parts of naphthalene water reducer and 50 parts of water. The LED street lamp can effectively reduce noise pollution to surrounding residents, can self-illuminate for a period of time after absorbing sunlight and illumination of the car lamp, has obvious visual effect, reduces lighting of the lamp, saves energy and reduces emission.

Description

Super-hydrophobic self-luminous sound insulation screen and construction method

Technical Field

The invention belongs to the technical field of sound insulation materials, and particularly relates to a super-hydrophobic self-luminous sound insulation screen and a construction method thereof.

Background

The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.

The viaduct plays an important role in the whole traffic system, and the value significance of the viaduct in the social operation process is irreplaceable. After the urban development, the traffic is crowded, the buildings are dense, the streets are difficult to widen, the traffic density can be evacuated by adopting the viaduct, and the transportation efficiency is improved. In addition, in the highways or railways between cities, viaducts are used for avoiding crossing with other line planes, saving land and reducing subgrade settlement (in some areas), and embankments are not needed. The bridge is limited by the existing buildings and required by the lines, and is provided with a plurality of bent bridges and slope bridges. The superstructure of the overhead line bridge generally adopts a simple beam or a continuous beam (or a rigid frame), and a cantilever beam is rare. When the span of the bridge is not large, a plate type structure can be used for the sake of beauty, and the thickness of the plate can be constant or only can be changed along the direction of the transverse bridge, and the plate type structure also can be made into a mushroom-shaped structure. At larger spans, they are often ribbed or box-section (see solid web bridges). The two sides of the box-shaped section extend out of the bridge deck to enlarge the bridge deck, and a narrow pier is arranged below the box-shaped section to form a spine-type structure, so that the bridge is attractive, practical, economical and popular particularly in curved bridges. The arrangement and the form of the piers of the urban elevated line bridge are good and bad, which directly influence the traffic and the beauty, and column type, pile type, rigid frame type and thin-wall type piers are often selected. The pillar pier is a single pillar pier with a rectangular, circular, oval or polygonal cross section. The pile type pier is fine, a plurality of piles are arranged in parallel, and pile tops are connected by a lintel beam to form a rigid frame type pier. The piles may be vertical or inclined and the architrave may be exposed or concealed within the superstructure for aesthetic reasons. The thin-wall pier is large in width (in the direction of a transverse bridge) and small in thickness; its facade may be rectangular, trapezoidal or diverging upwards to support the superstructure.

The rapid development of the viaduct also brings other problems correspondingly, and the generated noise pollution is the relatively prominent negative influence on residential areas near the viaduct at present.

Practice proves that when a vehicle runs, the exhaust of an engine, vibration generated by running, vibration of a vehicle body, friction between tires and the ground and the like are all causes of noise, and then the noise is transmitted through air and a bridge, and is mainly transmitted through air. The method has long been thought to cause serious influence on residents nearby the viaduct. In order to eliminate the influence, the inner arc-shaped noise-proof transparent organic glass baffles can be additionally arranged on the two sides of the viaduct, so that the noise can be greatly reduced. Therefore, the viaduct line in China can be continuously and rapidly constructed, and the arrangement of the sound insulation screen can weaken the influence on surrounding residents so as to meet the requirement of modern transportation and bring great economic benefit.

The convenience of viaducts also brings other problems at night. The viaduct has a great effect on relieving urban traffic pressure, but in recent years, the viaduct constructed at high speed has more electric energy consumed for illumination, and the viaduct is currently in energy conservation and emission reduction all over the country, so that the reduction of energy consumption is a big problem at the present stage.

Disclosure of Invention

In view of the problems in the prior art, it is an object of the present invention to provide a super-hydrophobic self-luminous sound-insulating panel and a method for manufacturing the same.

In order to solve the technical problems, the technical scheme of the invention is as follows:

a super-hydrophobic self-luminous sound-insulating screen is composed of polycarbonate resin, luminous powder K, reflecting powder, kaoline, water-reducing agent and water₂SiF₆:Mn₄ ⁺。

The invention provides a sound insulation screen which can realize self-luminescence for a period of time after absorbing sunlight and illumination of car lamps, wherein the sound insulation screen is a device fixed on two sides of a viaduct, and K is used in the invention₂SiF₆:Mn₄ ⁺In the prior art, K is used as luminescent powder to improve and prolong the self-luminescence time of the sound-proof screen₂SiF₆:Mn₄ ⁺The luminescent powder is applied to ceramic materials, and has luminescent performance, but does not have the property of ultra-long luminescence in the ceramic materials.

In some embodiments, the sound-proof screen comprises 800-1000 parts of polycarbonate resin, 75-80 parts of luminescent powder, 30-40 parts of reflective powder, 15-20 parts of kaolin, 10 parts of naphthalene water reducer and 50 parts of water. All components of the sound-proof screen are matched with each other to form a transparent sound-proof and light-emitting component.

In some embodiments, the reflective powder is glass bead powder with a particle size of 180-220 mesh. In some embodiments, the particle size of the luminescent powder is 550-650 mesh; preferably 580-620 meshes, and more preferably 600 meshes. The luminescent powder in the particle size range solves the problem of short luminescent powder time, and the invention finds that the luminescent powder in the particle size range is added into the sound-proof screen, so that the luminescent time of the sound-proof screen is longer than that of other particle sizes, and the luminescent powder and the base material in the particle size range can better volatilize light.

In some embodiments, the surface of the sound-proof screen is coated with a super-hydrophobic layer, and the super-hydrophobic coating is a boehmite material modified by hydrophobic fluorosilane substances and tetraethoxysilane through addition polymerization or by n-dodecanoic acid. The super-hydrophobic material has a lotus leaf effect, and endows the solid surface with antifouling, waterproof and oil-proof self-cleaning capabilities. The super-hydrophobic material has good light transmittance, but the light transmittance brightness of the material is not influenced, and the adhesion strength of ice and snow and the board surface can be reduced. In some embodiments, the kaolin has a plasticity index ranging from 9 to 18.

The preparation method of the sound insulation screen comprises the following specific steps:

carrying out dry mixing on polycarbonate resin, luminescent powder, reflective powder and kaolin, then adding water doped with a naphthalene-based high-efficiency water reducing agent, and carrying out injection molding on the obtained mixture to form a transparent part;

and dip-coating the outer surface of the transparent part with the super-hydrophobic coating to obtain the sound insulation screen.

In some embodiments, the water content of the polycarbonate resin is 0.02%. In some embodiments, the dry-mix time is 30-50 seconds. In some embodiments. The stirring time after adding water is 120-130 s.

In some embodiments, phosphor K₂SiF₆:Mn₄ ⁺Adding silicon dioxide powder into hydrofluoric acid solution to obtain silicofluoric acid solution; reacting the silicofluoric acid solution with a hydrogen peroxide solution of potassium permanganate and potassium fluoride, washing, centrifuging and drying a product; and mixing and coating the dried product with fluorescent powder under an acidic condition, filtering and drying after reaction, mixing the dried fluorescent product with a fluxing agent, and grinding to obtain the luminescent powder. The ceramic material also has the advantages of ceramic, high melting point, good thermal stability and good erosion resistance. K₂SiF₆:Mn₄ ⁺Have a low thermal conductivity, lower than most well-known low thermal conductivity materials. K doped with rare earth (Ce3+, Eu3+, etc.) for most research activities in the prior art₂SiF₆:Mn₄ ⁺The crystal is used for improving the high-temperature performance of the silicon-based ceramic. Preparation of K according to the invention₂SiF₆:Mn₄ ⁺The light-emitting effect is better when the light-emitting material is used for a sound-proof screen.

Luminescent powder K₂SiF₆:Mn₄ ⁺The preparation process comprises the steps of firstly preparing to obtain K₂SiF₆:Mn₄ ⁺Then again at K₂SiF₆:Mn₄ ⁺Surface coating ofAnd (4) fluorescent powder to obtain the luminescent powder.

Preferably, the concentration of the hydrofluoric acid solution is 40%, and the mass ratio (or molar ratio) of hydrofluoric acid to silicon dioxide is 1: 1.2. Preferably, the mass ratio (or molar ratio) of the silicofluoric acid to the potassium permanganate and the potassium fluoride is 1:1.2:1.2, and the mass concentration of the hydrogen peroxide of the potassium fluoride is 30%. Preferably, the mass coating ratio of the dried product to the fluorescent powder is 0.2.

The super-hydrophobic self-luminous sound-insulating screen is applied to the field of viaducts.

The invention has the beneficial effects that:

compared with the common sound insulation screen, the super-hydrophobic self-luminous sound insulation screen has self-luminous performance, plays a certain role in illumination and warning at night, and saves energy. The super-hydrophobic self-luminous sound-proof screen PC board absorbs and stores sunlight in the daytime, and then slowly releases energy stored in the luminescent powder at night, and the luminescence can be continued for 12-16 hours sometimes.

The super-hydrophobic self-luminous sound-insulating screen can effectively reduce noise pollution to surrounding residents, can realize self-luminous for a period of time after absorbing sunlight and illumination of vehicle lamps, has obvious visual effect, reduces lighting of the vehicle, saves energy and reduces emission. The super-hydrophobic self-luminous sound-insulating screen has low manufacturing cost and higher luminous identification degree, and the rest brightness can still be identified by human eyes after the brightness is attenuated for 12 hours.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the invention and not to limit the invention.

Fig. 1 shows the degree of luminescence of the self-luminous soundproof PC board prepared in example 1.

Fig. 2 is a graph showing the tendency of luminescence decay of the self-luminous acoustic panel prepared in example 1.

Detailed Description

It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise. The invention will be further illustrated by the following examples

Example 1

The preparation method of the luminescent powder comprises the following steps:

1. standard solution preparation

Respectively preparing potassium permanganate (KMnO4) with the purity of 99.5 percent; potassium fluoride (KF,) of 99% purity; hydrofluoric acid (HF) with a concentration of 40%, hydrogen peroxide solution (H2O2) with a concentration of 30%, silicon dioxide (SiO2) with a purity of 99%; methanol (CH3OH) with the purity of 99 percent, absolute ethyl alcohol (CH3CH2OH) with the purity of 99.7 percent, nitric acid (HNO3) with the purity of 99 percent, ammonia water (NH4OH) with the purity of 99 percent, ethyl orthosilicate (C8H20O4Si), and laboratory water is self-made deionized water.

2. Preparation procedure

1) Preparing a hydrofluoric acid solution: weighing 10g of hydrofluoric acid by using balance, putting the hydrofluoric acid into a 100ml beaker, measuring 40ml of deionized water, and preparing a hydrofluoric acid solution at normal temperature;

2) adding 30ml of hydrofluoric acid solution into the beaker, and then adding SiO₂Powder is reacted to generate a silicofluoric acid solution;

3) adding 3ml of silicofluoric acid solution and potassium permanganate;

4) dropwise adding hydrogen peroxide (H2O2) with the concentration of potassium fluoride of 30 percent, and stirring for 60 minutes;

5) washing with methanol and deionized water, and centrifuging in a 4000r/min centrifuge;

6) drying the resultant in an oven at 80 ℃ for 4 hours;

7) adding nitric acid to adjust the pH value of the solution to 2, carrying out water bath at 80 ℃ for 1h, adding fluorescent powder according to the coating ratio of 0.2, and stirring the solution in a stirrer to form gel;

8) cooling to room temperature, carrying out first suction filtration, then washing for 3 times by using deionized water, and carrying out suction filtration;

9) drying at 80 deg.C for 12 hr;

10) adding a small amount of fluxing agent, and grinding by using a mortar;

11) fully grinding to obtain the long-afterglow luminescent powder.

The preparation method of the super-hydrophobic layer comprises the following steps:

1) sequentially dissolving 1g of sodium metaaluminate powder and 8.7g of urea crystals in 30ml of deionized water;

2) transferring the solution into a polytetrafluoroethylene inner container after 20 min;

3) sealing in a stainless steel reaction kettle, and keeping the temperature at 140 ℃ for 10 hours

4) Taking out, cooling to room temperature in the air, filtering, washing with deionized water and absolute ethyl alcohol, and drying to obtain boehmite

5) Preparing 60ml of 1mol/L n-dodecanoic acid ethanol solution;

6) adding 0.4g of boehmite powder and reacting for 2 hours with stirring;

7) filtering and separating by using filter paper, and drying for 4 hours at 60 ℃ to obtain the super-hydrophobic coating;

8) and (3) coating the paint on a concrete base to obtain the super-hydrophobic modified surface.

Preparing a self-luminous sound-proof screen:

1) PC board special for sound barrier: taking polycarbonate resin as a main component, drying before processing, controlling the specific drying temperature to be 110 ℃, drying for 8 hours to reduce the water content to be below 0.02%, adding 900 parts of polycarbonate resin, 75 parts of luminescent powder, 30 parts of reflective powder and 15 parts of kaolin, dry-mixing for 40s, pouring tap water doped with 4 parts of naphthalene high-efficiency water reducing agent, stirring for 120s, and forming a transparent part by using the obtained mixture in an injection molding mode;

2) super hydrophobic layer: dip-coating a layer of super-hydrophobic coating outside the PC board of the sound insulation screen formed in the step 1).

The self-luminous soundproof screen prepared in example 1 had a high contact angle and a low rolling angle, which were 156.6 ° and 5.2 °, respectively.

The tensile strengths of the prepared super-hydrophobic self-luminous cured product after 3 days and 28 days are 33Mpa and 72Mpa respectively.

As can be seen from FIG. 1, the self-luminous sound-proof screen has a good luminous effect, and as can be seen from FIG. 2, the luminous time of the self-luminous sound-proof screen can be 8-12h, and the luminous decay is less at 12h compared with 8-11 h.

Example 2

The difference from example 1 is that the particle size of the luminescent powder is 580 mesh.

Preparing a self-luminous sound-proof screen:

1) PC board special for sound barrier: taking polycarbonate resin as a main component, drying before processing, controlling the specific drying temperature to be 115 ℃, drying for 8 hours to reduce the water content to be below 0.02%, adding 900 parts of polycarbonate resin, 80 parts of luminescent powder, 40 parts of reflective powder and 20 parts of kaolin, dry-mixing for 40s, pouring tap water doped with 6 parts of naphthalene high-efficiency water reducing agent, stirring for 130s, and forming a transparent part by using the obtained mixture in an injection molding mode;

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A preparation method of a super-hydrophobic self-luminous sound-proof screen is characterized by comprising the following steps: the sound insulation screen comprises 800-1000 parts of polycarbonate resin, 75-80 parts of luminescent powder, 30-40 parts of reflective powder, 15-20 parts of kaolin, 10 parts of naphthalene water reducer and 50 parts of water; the luminescent powder is K₂SiF₆:Mn₄ ⁺；

The method comprises the following specific steps:

dip-coating the outer surface of the transparent part with a super-hydrophobic coating to obtain a sound insulation screen;

the water content of the polycarbonate resin was 0.02%;

the dry mixing time is 30-50 s;

the stirring time after adding water is 120-130 s.

2. The preparation method of the super-hydrophobic self-luminous sound-proof screen according to claim 1, wherein the method comprises the following steps: the reflective powder is glass bead powder with the particle size of 180-220 meshes.

3. The preparation method of the super-hydrophobic self-luminous sound-proof screen according to claim 1, wherein the method comprises the following steps: the particle size of the luminescent powder is 550-650 meshes.

4. The preparation method of the super-hydrophobic self-luminous sound-proof screen according to claim 1, wherein the method comprises the following steps: the particle size of the luminescent powder is 580-620 meshes.

5. The preparation method of the super-hydrophobic self-luminous sound-proof screen according to claim 1, wherein the method comprises the following steps: the particle size of the luminescent powder is 600 meshes.

6. The preparation method of the super-hydrophobic self-luminous sound-proof screen according to claim 1, wherein the method comprises the following steps: the surface of the sound insulation screen is coated with a super-hydrophobic layer, and the super-hydrophobic coating is a boehmite material modified by n-dodecanoic acid or obtained by addition polymerization and compounding of hydrophobic fluorosilane substances and ethyl orthosilicate.

7. The application of the sound-proof screen prepared by the method for preparing the super-hydrophobic self-luminous sound-proof screen as claimed in any one of claims 1 to 6 in the field of viaducts.