A polypyrrole / polyethylene geotextile absorbing material for construction and preparation method thereof

Abstract

The present invention discloses a polypyrrole / polyethylene geotextile absorbing material for construction and a preparation method thereof, and the preparation process is divided into three steps: (1) Preparation of substrate. The geotextile is cut into identical sample blocks, weighed and recorded; the geotextile is fully wetted. (2) Preparation of solution: a certain amount of ammonium persulfate and D(+)-10-camphorsulfonic acid are weighed, and 15% (volume ratio) of experimental water is added respectively; at the same time, a certain concentration of pyrrole solution is prepared, and the molar ratio of pyrrole to ammonium persulfate is 1:1 (3) Preparation of materials. Control other conditions unchanged, change the reaction temperature (0°C, 17°C, 37°C, 57°C), and prepare 4 kinds of absorbing materials respectively. First, the geotextile is placed in the pyrrole solution to fully absorb the pyrrole monomer; then the ammonium persulfate solution is added dropwise to the pyrrole solution to initiate an oxidation reaction; as above, after sufficient oxidation, the D(+)-10-camphorsulfonic acid solution is added dropwise for doping; finally, the sample is washed and dried.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic wave absorbing protective materials, and in particular to a polypyrrole / polyethylene geotextile wave absorbing material for construction with a polyethylene geotextile as a substrate and polypyrrole as wave absorbing functional particles and having good wave absorbing performance, and a preparation method thereof. Background Art

[0002] With the rapid development of electronic technology in the civil and military fields, the problem of electromagnetic pollution has become increasingly serious. The World Health Organization has listed it as the fourth largest source of pollution after air pollution, water pollution and noise pollution. Electromagnetic wave radiation can have a great impact on human health and the normal operation of electronic equipment; in the military, it can also interfere with the signals of military electronic equipment such as aircraft and radar, threatening soldiers and information security. Therefore, with the advent of the era of artificial intelligence, the research and development of electromagnetic protection materials is of great significance to both the military and civilian fields.

[0003] Absorbing materials can absorb and attenuate electromagnetic waves incident on the surface of the material, convert electromagnetic energy into other forms of energy such as heat energy and mechanical energy, and thus fundamentally solve the problem of electromagnetic radiation. With the improvement of the sensitivity and wide application of electronic devices, especially wireless electronic devices, all walks of life have put forward higher and higher requirements for the protection of electromagnetic interference (EMI). For rooms containing transformers or other electronic equipment related to electricity and telecommunications, it is particularly necessary to protect against electromagnetic interference. Therefore, the research on absorbing materials for construction is imminent. At present, the research on electromagnetic protection materials for construction by researchers at home and abroad is mainly focused on cement-based building absorbing composite materials with the addition of highly conductive carbon fibers, carbon nanotubes (CNTs) and graphene, and there is relatively little research on electromagnetic protection materials for textile buildings.

[0004] Conductive polymer is a commonly used absorbing functional material with advantages such as good flexibility, easy processing and light weight. Generally, polymers generated only by polymerization initiated by oxidants are non-conductive, but through treatment with dopants, defects can be generated in their regular structure, making them conductive, and their conductive properties can be adjusted over a large range, thereby adjusting their absorbing properties. Among the many conductive polymers, polypyrrole has been widely studied in the fields of electricity and electromagnetic absorption due to its advantages such as simple synthesis, stable properties, green environmental protection, and good conductivity through doping. The π electron clouds in the polypyrrole molecular chain overlap with each other, so that the entire molecule has a common energy band. These π electrons are like free electrons in metal conductors. When an electric field is added to the external environment, these π electrons that make up the π bond will move rapidly along the molecular chain, so that polypyrrole has a certain conductivity.

[0005] Geotextile is a kind of nonwoven and industrial fabric. Its characteristics and functions are isolation, reinforcement, filtration, drainage and protection. Therefore, it can be widely used in the construction of roads and roadbeds, road repairs and as a frame-type reinforcement material required for adding new asphalt covering layers on the road surface; used in dams, dam foundations, embankments, embankments, earth walls and stable steep slopes; used in drainage, discharge, river bank, river embankment protection and coastal protection. It is an excellent performance of protective textiles for construction. Therefore, compounding polypyrrole with polyethylene geotextile is an effective way to enhance the electromagnetic wave absorption function of protective textiles for construction. Summary of the invention

[0006] The technical problem solved by the present invention is to provide a building absorbing material with polyethylene geotextile as a substrate and polypyrrole as an absorbing agent, which can effectively protect electromagnetic waves in an electromagnetic field environment and a preparation method thereof. The present invention uses an in-situ polymerization method to finish polypyrrole on textiles, and uses a building geotextile material with a low price and good flexibility, thereby solving the problem that the use of traditional cement-based building absorbing composite materials is limited due to their high hardness.

[0007] A polypyrrole / polyethylene geotextile absorbing material for construction. The preparation method thereof comprises the following steps:

[0008] Step 1: Preparation of substrate:

[0009] (1) Cut the polyethylene geotextile into sample blocks of the same size, weigh them and record the data.

[0010] (2) Place the weighed polyethylene geotextile into a beaker of water to completely wet it.

[0011] Step 2 Solution preparation:

[0012] (1) Weigh a certain amount of ammonium persulfate (oxidant) and D(+)-10-camphorsulfonic acid (dopant).

[0013] (2) Place ammonium persulfate and D(+)-10-camphorsulfonic acid in two clean beakers, and then add 15% (volume ratio) of experimental water to each beaker. The concentration of the prepared D(+)-10-camphorsulfonic acid solution is 0.30 mol / L to 1.20 mol / L.

[0014] (3) The molar ratio of pyrrole to ammonium persulfate is 1:1, and the concentration of pyrrole monomer is 0.3 mol / L to 1.2 mol / L. Use a pipette to measure a certain amount of pyrrole solution, then slowly and evenly add the pyrrole solution to a beaker containing a certain amount of water, and stir continuously with a glass rod until the solution becomes clear and transparent.

[0015] Step 3 Preparation of polypyrrole / polyethylene geotextile absorbing material for construction:

[0016] (4) Squeeze out the water from the moistened polyethylene geotextile, relax it, put it into the pyrrole solution, and stir it continuously to allow it to fully absorb the pyrrole monomer for 15 to 45 minutes.

[0017] (5) Use a glass rod to pick up the polyethylene geotextile, and add the prepared oxidant solution to the pyrrole solution, stirring and mixing continuously to initiate the oxidation reaction. Initially, the oxidant solution is added at a rate of 1d / s to 3d / s, and then the amount of addition is appropriately increased. The entire addition process is controlled within 8min to 15min. After the addition is completed, continue to stir and mix continuously for 20min to 50min.

[0018] (6) After full oxidation, pick up the polyethylene geotextile with a glass rod, add the prepared dopant solution to the solution, stir and mix continuously, and start doping. Initially, add the dopant solution at a rate of 1d / s to 3d / s, then increase the amount of addition appropriately, and control the entire addition process within 8min to 15min. After the addition is completed, continue to stir and mix continuously for 20min to 50min.

[0019] (7) After the reaction is completed, the polypyrrole / polyethylene geotextile absorbing material is taken out and placed in a beaker filled with clean water, stirred and cleaned with a glass rod for 3 to 6 times, the water is squeezed out, and then naturally dried to complete the preparation.

[0020] Advantages of the present invention:

[0021] The present invention uses polypyrrole as the wave absorbing agent, and polypyrrole has excellent properties such as light weight, good conductivity, and easy to adjust conductivity. At the same time, the in-situ polymerization method is adopted, and the polyethylene geotextile with strong durability, low cost and wide application range is used as the matrix of the wave absorbing material to prepare the polypyrrole / polyethylene geotextile wave absorbing material. The preparation method is simple and easy to operate, and the material has good flexibility and excellent wave absorbing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a flow chart for the preparation of polypyrrole / polyethylene geotextile absorbing materials for construction.

[0023] Figure 2 This is a diagram of the wave absorption mechanism of the polypyrrole / polyethylene geotextile wave absorbing material for construction prepared in the example.

[0024] Figure 3 This is a graph showing the reflection loss (RL) data of the polypyrrole / polyethylene geotextile absorbing material for construction prepared in the example. (Note: 1 reaction temperature is 0°C; 2 reaction temperature is 17°C; 3 reaction temperature is 37°C; 4 reaction temperature is 57°C.) DETAILED DESCRIPTION

[0025] The present invention provides a polypyrrole / polyethylene geotextile absorbing material for construction and a preparation method thereof. The present invention is further described below through specific implementation schemes in conjunction with the accompanying drawings.

[0026] Example 1

[0027] The effect of reaction temperature on the reflection loss of polypyrrole / polyethylene geotextile absorbing materials is investigated. The polypyrrole / polyethylene geotextile absorbing materials for construction and the preparation method thereof include the following steps:

[0028] Step 1: Preparation of substrate:

[0029] (1) Cut the polyethylene geotextile into sample blocks of the same size, weigh and record.

[0030] (2) Place the polyethylene geotextile in a beaker of water to completely wet it.

[0031] Step 2 Preparation of solution:

[0032] (1) Weigh a certain amount of ammonium persulfate and D(+)-10-camphorsulfonic acid.

[0033] (2) Place ammonium persulfate and D(+)-10-camphorsulfonic acid in two clean beakers, and then add 15% (volume ratio) distilled water to each beaker. The concentration of the prepared D(+)-10-camphorsulfonic acid solution is 0.30 mol / L to 1.20 mol / L.

[0034] (3) The molar ratio of pyrrole to ammonium persulfate is 1:1, and the concentration of pyrrole monomer is 0.3 mol / L to 1.2 mol / L. Use a pipette to measure a certain amount of pyrrole solution, and then slowly and evenly add the pyrrole solution to a beaker containing a certain amount of water, stirring while adding. After the addition is completed, continue to stir with a glass rod until the oil spots on the surface of the solution disappear, that is, the pyrrole monomer is completely dissolved in the water and the solution is clear and transparent.

[0035] Step 3 Preparation of polypyrrole / polyethylene geotextile absorbing material for construction:

[0036] (4) The pyrrole solution was placed in different temperature environments (0°C, 17°C, 37°C, and 57°C), and other conditions were kept unchanged. Then, the polyethylene geotextile was placed in the pyrrole solution and stirred continuously to allow it to fully absorb the pyrrole monomer for 15 minutes to 45 minutes, and four absorbing materials with different reaction temperatures were prepared.

[0037] (5) The temperature during the experimental reaction is the same as step (4). Use a glass rod to pick up the polyethylene geotextile, add the prepared ammonium persulfate solution to the pyrrole solution, stir evenly, then put the polyethylene geotextile back into the solution, stir and stir continuously to initiate the reaction. Initially, add the oxidant solution at a rate of 1d / s to 3d / s, then increase the amount of addition appropriately, and control the entire addition process within 8min to 15min. After the addition is completed, continue to stir and stir continuously for 20min to 50min.

[0038] (6) The temperature during the experimental reaction is the same as step (4). After sufficient oxidation, pick up the polyethylene geotextile with a glass rod, add the prepared D(+)-10-camphorsulfonic acid solution to the solution, stir evenly, then put the polyethylene geotextile back into the solution, stir and mix continuously, and start doping. Initially, add the D(+)-10-camphorsulfonic acid solution at a rate of 1d / s to 3d / s, then increase the amount of addition appropriately, and control the entire addition process within 8 min to 15 min. After the addition is completed, continue to stir and mix continuously for 20 min to 50 min.

[0039] (7) After the reaction is completed, the polypyrrole / polyethylene geotextile absorbing material is taken out and placed in a beaker filled with clean water, and stirred and washed repeatedly 3 to 6 times with a glass rod.

[0040] According to the process, the absorbing performance of the polypyrrole / polyethylene geotextile absorbing material for construction is different at different reaction temperatures. The reflection loss curve is as follows: Figure 3 As shown. Figure 3 It can be seen that with the increase of reaction temperature, the reflection loss value tends to decrease, and when the reaction temperature is 0℃, the material has the best wave absorption effect.

Claims

1. A method for preparing a polypyrrole / polyethylene geotextile absorbing material for construction, characterized in that: The following steps are involved: (1) Preparation of substrate: Cut the polyethylene geotextile into identical sample blocks, weigh and record the weight; then put the polyethylene geotextile into water to fully wet it; (2) Solution preparation: Weigh ammonium persulfate and D(+)-10-camphorsulfonic acid, and then add 15% by volume of experimental water to prepare solutions, thereby obtaining an ammonium persulfate solution and a D(+)-10-camphorsulfonic acid solution; Use a pipette to measure pyrrole, slowly and uniformly add the pyrrole to a beaker containing water, stirring while adding, to obtain a pyrrole solution; wherein the concentration of the prepared D(+)-10-camphorsulfonic acid solution is 0.30 mol / L to 1.20 mol / L, the molar ratio of the pyrrole to the ammonium persulfate is 1:1, and the concentration of the pyrrole solution is 0.3 mol / L to 1.2 mol / L; (3) Preparation of materials: first, the polyethylene geotextile prepared in step (1) is placed in the pyrrole solution, and is continuously stirred to fully absorb the pyrrole monomer; then, the ammonium sulfate solution is dripped into the pyrrole solution to initiate an oxidation reaction; after sufficient oxidation, the D(+)-10-camphorsulfonic acid solution is dripped to carry out a doping reaction, and after the reaction is completed, the polypyrrole / polyethylene geotextile absorbing material for construction is washed and dried to prepare; wherein the reaction temperature in the preparation process is 0°C, 17°C, 37°C or 57°C.

2. The method for preparing a polypyrrole / polyethylene geotextile absorbing material for construction according to claim 1, characterized in that: The process of dropwise adding the ammonium sulfate solution and the D(+)-10-camphorsulfonic acid solution is 8 to 15 minutes, the time of the oxidation reaction and the doping reaction is 20 to 50 minutes, and the time of fully adsorbing the pyrrole monomer is 15 to 45 minutes.

3. The polypyrrole / polyethylene geotextile absorbing material for construction obtained by the preparation method according to claim 1 or 2.

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