CN113438884A - Water-based high-permeability wave-absorbing plate and preparation method thereof - Google Patents
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Abstract
The invention provides a water-based high-permeability wave absorbing plate and a preparation method thereof, wherein the water-based high-permeability wave absorbing plate comprises the following components in parts by mass: 80-200 parts of absorbent and 10-50 parts of water-based thermoplastic binder; also comprises a dispersant, a defoaming agent, a thickening agent and a cross-linking agent. The technical scheme provided by the invention solves the problems of solvent pollution, slow volatilization speed of aqueous formula coating, low product magnetic permeability, poor product temperature resistance and the like in the prior art.
Description
Technical Field
The invention relates to the field of electromagnetic interference and electromagnetic compatibility, in particular to a water-based high-permeability wave-absorbing plate and a preparation method thereof.
Background
With the rapid development of information technology, electronic exhibits are developed to high frequency, micro size and integration, and electromagnetic interference and electromagnetic radiation pollution are more serious. The wave-absorbing material can absorb electromagnetic waves incident to the surface of the wave-absorbing material and then convert the electromagnetic waves into heat energy or energy in other forms, and can effectively solve the problems of electromagnetic interference and electromagnetic radiation pollution.
The wave-absorbing material mainly comprises an absorbent and a binder, the binder generally adopts thermoplastic resin, and the wave-absorbing material mainly has two production processes, wherein one process is dry production, namely, firstly, the absorbent and the thermoplastic resin are subjected to banburying and plasticizing in a banbury mixer, then, the absorbent is taken out of a sheet on a calender, and finally, the sheet is vulcanized and crosslinked on a vulcanizer; the other method is wet coating, wherein the warm coating is divided into a solvent type formula and a water type formula, the production process comprises the steps of firstly stirring and dispersing the absorbent, the binder and the auxiliary agent uniformly, then coating the mixture on a PET release film to volatilize the solvent or water, then drying the mixture to obtain a coating, and vulcanizing and crosslinking the coating on a vulcanizing machine, wherein the solvent type formula is different from the water type formula, the solvent is added into the solvent type formula, the water is added into the water type formula, and the solvent type formula pollutes the environment and harms the body health of production workers. At present, the production of the wave-absorbing material has been tried by an aqueous formula, but a large amount of solvents which can be mixed and dissolved with water, such as absolute ethyl alcohol, acetone and the like, are required to be added into the formula to improve the volatilization speed, so that the solvent pollution is not completely avoided.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a water-based coating-formed wave-absorbing material, aiming at solving the problems of solvent pollution, slow volatilization speed of water-based formula coating, low magnetic conductivity of products and poor temperature resistance of products in the prior art.
On one hand, the invention provides a water-based high-permeability wave absorbing plate which comprises the following components in parts by mass: 80-200 parts of absorbent and 10-50 parts of water-based thermoplastic binder; also comprises a dispersant, a defoaming agent, a thickening agent and a cross-linking agent.
Further, the absorbent is one or more of iron-based, iron-silicon-based, iron-cobalt-based, iron-aluminum-based, iron-molybdenum-based, iron-chromium-based, iron-nickel-based, iron-manganese-based and iron-beryllium-based alloy powder. The preferred form is a tablet form, D50 is 20-100 μm.
Further, the aqueous thermoplastic binder is one or more of aqueous polyurethane dispersion, aqueous EVA emulsion, SBR emulsion, aqueous acrylic resin, polyvinyl alcohol, polyethylene oxide, aqueous epoxy resin and aqueous organic silicon resin.
Further, the dispersant is one or more of polyether phosphate, modified acrylic polymer and polyurethane dispersant.
The defoaming agent is one or more of defoaming agents such as polyethers, higher alcohols, silicones, polyether-modified silicones, self-emulsifying agents, silicones, and the like.
Further, the thickening agent is one of associative polyurethane thickening agent, modified hydroxyethyl fiber, sodium carboxymethyl cellulose and sodium alginate.
Further, the cross-linking agent is one or more of blocked water-based isocyanate, a propylene oxide compound, an aziridine compound, an amino resin, MOCA, dicumyl peroxide and 3, 5-dimethylthiotoluenediamine (DMTDA).
On the other hand, the invention also provides a preparation method of the water-based high-permeability wave-absorbing plate, which comprises the following steps:
s10: stirring and dispersing an absorbent, a water-based thermoplastic binder, a dispersing agent, a defoaming agent, a thickening agent, a cross-linking agent and deionized water into uniform slurry;
wherein, the absorbent accounts for 80 to 200 parts; 10-50 parts of the water-based thermoplastic binder; 100 portions and 300 portions of deionized water; the addition amount of the dispersant is 0.1-1% of the mass of the slurry; the addition amount of the defoaming agent is 0.1-1% of the mass of the slurry; the addition amount of the thickening agent is 0.1-1% of the mass of the slurry; the addition amount of the cross-linking agent is 1-50% of the solid content in the aqueous thermoplastic binder;
s20: coating the slurry, and volatilizing water to form a coating;
s30: and carrying out hot-pressing crosslinking on the coating to obtain the wave absorbing plate.
Preferably, the deionized water has a conductivity of 10 μ S or less.
Further, step S20 includes:
s21: coating the slurry in a blade coating mode; the slurry forms an orientation effect under the action of a scraper, which is beneficial to the magnetic property of a final product;
s22: and the microwave and hot air are combined for volatilizing the moisture in the slurry to form the coating. The traditional hot air coating machine has very low near-volatilization efficiency on water, low coating speed and high energy consumption, the microwave has higher volatilization speed on water, the temperature of common microwave is up to 300 ℃ due to the rapid temperature rise of water and an absorbent, and the crosslinking agent in the PET film and the sizing agent can not bear the high temperature, and the microwave can volatilize the solvent water in a short time and can not cause the crosslinking agent to lose efficacy due to the matching of the microwave dosage, the structure and a cooling device.
Further, the hot pressing conditions were as follows: when the wave absorbing plate is required to be a sheet, a vacuumizing flat vulcanizing machine is adopted, the hot pressing temperature is 150-190 ℃, and the pressure is 5-50 Mpa; when the wave absorbing plate is required to be a coiled material, a roller type continuous vulcanizing machine is adopted, the hot pressing temperature is 170-210 ℃, and the pressure is 2-10 Mpa.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of the preparation of the wave-absorbing plate provided by the present invention.
FIG. 2 is a schematic diagram of temperature resistance detection according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and 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, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
[ example 1 ]
Referring to fig. 1, the present embodiment provides an aqueous high-permeability wave-absorbing plate, and a preparation method thereof includes the following steps:
s10: mixing the absorbent, deionized water, a dispersing agent, a defoaming agent and a thickening agent, putting the mixture into a stirring dispersion pot, stirring and dispersing for 2 hours at the stirring speed of 25 revolutions per minute and 2000 revolutions per minute, then adding the aqueous thermoplastic resin and the crosslinking agent, setting the stirring speed to be 25 revolutions per minute and 1200 revolutions per minute, and stirring and dispersing for 1 hour to obtain the slurry.
Wherein the absorbent is sheet iron-silicon-aluminum powder, 85 parts; 127 parts of deionized water; the dispersant is polyether acid ester, and the using amount of the polyether acid ester is 0.5 percent of the mass of the slurry; the defoaming agent is a polyether defoaming agent, and the using amount of the polyether defoaming agent is 0.1% of that of the slurry; the thickening agent is modified hydroxyethyl cellulose, and the using amount of the thickening agent is 0.7 percent of the mass of the slurry; 30 parts of water-based EVA emulsion is selected as the water-based thermoplastic binder; the cross-linking agent is DMTDA, and the using amount of the cross-linking agent is 3% of the mass of the aqueous thermoplastic binder.
And (3) starting vacuum defoaming 30 minutes before discharging to obtain the magnetic water-based slurry with the solid content of 48.38%. Wherein the flaky ferrosilicon aluminum powder D50 is 50um, and the apparent density is 0.45.
S20: coating the magnetic water-based slurry on a PET release film in a blade coating mode at a coating speed of 5 m/min; and (3) volatilizing solvent water by combining microwave and hot air to form a coating with the width of 330mm and the thickness of 130 um.
S30: cutting the coated coil coating into sheets with the length of 350mm, overlapping the two cut sheets, placing the PET with the coating facing inwards into a flat vulcanizing machine, and vulcanizing and crosslinking at the temperature of 175 ℃, the pressure of 20Mpa and the time of 60 seconds to obtain the wave absorbing plate.
[ example 2 ]
The present example provides an aqueous high permeability wave absorbing plate, which is prepared by the method described in example 1, except that:
1. 88 parts of flaky ferrosilicon aluminum powder is selected as the absorbent; 175 parts of the deionized water; the dispersant is a modified acrylic polymer, and the using amount of the modified acrylic polymer is 0.5% of the mass of the slurry; the defoaming agent is a polyether defoaming agent, and the using amount of the polyether defoaming agent is 0.1% of that of the slurry; the thickening agent is modified hydroxyethyl cellulose, and the using amount of the thickening agent is 0.7 percent of the mass of the slurry; 24 parts of aqueous polyurethane dispersion is selected as the aqueous thermoplastic binder; the cross-linking agent is dicumyl peroxide, and the dosage of the cross-linking agent is 3% of the mass of the aqueous thermoplastic binder.
The solid content of the magnetic aqueous slurry obtained in the step S10 was 39.96%; wherein, the flaky ferrosilicon aluminum powder D50 is 70um, and the loose packed density is 0.32.
2. The hot pressing temperature is 185 ℃ and the pressure is 50 Mpa.
[ example 3 ]
The present example provides an aqueous high permeability wave absorbing plate, which is prepared by the method described in example 1, except that:
1. 105 parts of flaky ferrosilicon aluminum powder is selected as the absorbent; 215 parts of deionized water; the dispersant is a modified acrylic polymer, and the using amount of the modified acrylic polymer is 0.3% of the mass of the slurry; polyether modified silicon is selected as the defoaming agent, and the using amount of the polyether modified silicon is 0.5% of that of the slurry; the thickening agent is modified hydroxyethyl cellulose, and the using amount of the thickening agent is 0.8 percent of the mass of the slurry; 35 parts of water-based acrylic resin is selected as the water-based thermoplastic binder; the cross-linking agent is MOCA, and the dosage of the cross-linking agent is 5% of the mass of the aqueous thermoplastic binder.
The solid content of the magnetic aqueous slurry obtained in the step S10 was 40.68%; wherein, the flaky ferrosilicon aluminum powder D50 is 60um, and the loose packed density is 0.41.
2. The hot pressing temperature is 185 ℃ and the pressure is 50 Mpa.
[ example 4 ]
The present example provides an aqueous high permeability wave absorbing plate, which is prepared by the method described in example 1, except that:
1. the absorbent is sheet iron-silicon-aluminum powder, 135 parts; 145 parts of deionized water; the dispersant is polyether phosphate, and the using amount of the polyether phosphate is 0.5% of the mass of the slurry; polyether modified silicon is selected as the defoaming agent, and the using amount of the polyether modified silicon is 0.6% of that of the slurry; the thickening agent is modified hydroxyethyl cellulose, and the using amount of the thickening agent is 0.3 percent of the mass of the slurry; 44 parts of water-based organic silicon resin is selected as the water-based thermoplastic binder; the cross-linking agent is blocked water-based isocyanate, and the using amount of the cross-linking agent is 5% of the mass of the water-based thermoplastic adhesive.
The solid content of the magnetic aqueous slurry obtained in the step S10 is 56.16%; wherein, the flaky ferrosilicon aluminum powder D50 is 70um, and the loose packed density is 0.32.
2. The hot pressing temperature is 185 ℃ and the pressure is 50 Mpa.
[ example 5 ]
The present example provides an aqueous high permeability wave absorbing plate, which is prepared by the method described in example 1, except that:
1. the absorbent is sheet iron-silicon-aluminum powder, and 167 parts of the absorbent is selected; 165 parts of deionized water; the dispersant is polyether phosphate, and the using amount of the polyether phosphate is 0.5% of the mass of the slurry; polyether modified silicon is selected as the defoaming agent, and the using amount of the polyether modified silicon is 0.6% of that of the slurry; the thickening agent is modified hydroxyethyl cellulose, and the using amount of the thickening agent is 0.8 percent of the mass of the slurry; 18 parts of polyethylene oxide is selected as the aqueous thermoplastic binder; the cross-linking agent is 3, 5-dimethylthiotoluenediamine, and the using amount of the cross-linking agent is 5% of the mass of the aqueous thermoplastic binder.
The solid content of the magnetic aqueous slurry obtained in the step S10 was 53.85%; wherein the flaky ferrosilicon aluminum powder D50 is 60um, and the apparent density is 0.38.
2. The hot pressing temperature is 185 ℃ and the pressure is 50 Mpa.
[ examples 6 to 10 ]
An aqueous high permeability wave absorbing plate is provided, which is prepared by the method described in example 2, except that an aqueous polyurethane dispersion is used as the aqueous thermoplastic binder; see table 1 for details.
TABLE 1
The wave-absorbing plate provided in examples 1-10 was tested according to the following test items:
and (3) appearance detection: the test was carried out as specified in clause 6.1 of GB/T32596-2016. The wave-absorbing material has the advantages of smooth appearance surface, uniform color distribution, no bubbles, cracks, holes, deformation, corrosion, obvious impurities, processing damage, no powder falling, no layering, no scratch and other obvious apparent defects.
The density detection method comprises the following steps: the test was carried out as specified in clause 6.5 of GB/T32596-2016.
The thickness detection method comprises the following steps: the test was carried out as specified in clause 6.5 of GB/T32596-2016.
The relative magnetic permeability detection method comprises the following steps: the test is carried out according to the specification of 6.2 of GB/T32596-2016, and the numerical value at 3MHz is taken, the inner diameter of the sample holder is 6mm, the outer diameter is 19mm, and the height is kept between 0.2mm and 0.7 mm.
The surface resistance detection method comprises the following steps: the test was carried out as specified in clause 6.5 of GB/T32596-2016.
The wear-resisting times detection method comprises the following steps: the detection is carried out according to the specification of 3.3 of HG/T4303-.
Testing method of temperature resistance. Cutting the wave-absorbing finished product into 5cmx5cm sheets, taking points on the sheets according to the squared figure and measuring the thickness of the points by a micrometer, then putting the sheets into an oven, wherein the oven temperature is 120 ℃, the baking time is 2 hours, taking out the sheets and measuring the thickness of 9 points again, and referring to figure 2.
The water resistance detection method comprises the following steps: detection was carried out according to the GB/T1733-1993.
And (3) an alkali resistance detection method: detection is carried out according to the specification of GB/T9274-1988.
The salt spray resistance detection method comprises the following steps: the assay was carried out according to the GB/T1771-1991.
The ethanol resistance detection method comprises the following steps: detection is carried out according to the specification of GB/T1763-1979.
The impact resistance detection method comprises the following steps: detection was carried out according to the GB/T1732-1993.
The salt water resistance detection method comprises the following steps: detection was carried out according to the GB/T10834-1989.
The detection results are shown in table 2, wherein the comparative example is the water-based wave-absorbing material which is circulated in the market.
TABLE 2
As can be seen from the above table, the examples 1 to 10 are greatly improved in the density, magnetic permeability, surface resistance, abrasion resistance, temperature resistance, water resistance, ethanol resistance, etc., as compared with the comparative examples.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The water-based high-permeability wave-absorbing plate is characterized by comprising the following components in parts by mass:
80-200 parts of absorbent and 10-50 parts of water-based thermoplastic binder;
also comprises a dispersant, a defoaming agent, a thickening agent and a cross-linking agent.
2. The aqueous high permeability wave absorbing plate of claim 1, wherein the absorber is one or more of iron-based, iron-silicon-based, iron-cobalt-based, iron-aluminum-based, iron-molybdenum-based, iron-chromium-based, iron-nickel-based, iron-manganese-based, and iron-beryllium-based alloy powders.
3. The aqueous high permeability wave absorbing plate of claim 1, wherein the aqueous thermoplastic binder is one or more of an aqueous polyurethane dispersion, an aqueous EVA emulsion, an SBR emulsion, an aqueous acrylic resin, polyvinyl alcohol, polyethylene oxide, an aqueous epoxy resin, and an aqueous silicone resin.
4. The aqueous high permeability wave absorbing plate of claim 1, wherein the dispersant is one or more of polyether phosphate, modified acrylic polymer, polyurethane dispersant.
5. The water-based high permeability wave-absorbing plate of claim 1, wherein the defoaming agent is one or more of polyether, high carbon alcohol, silicon, polyether-modified silicon, self-emulsifying type, polysiloxane and the like.
6. The aqueous high-permeability wave-absorbing plate of claim 1, wherein the thickener is one of associative polyurethane thickener, modified hydroxyethyl fiber, sodium carboxymethyl cellulose and sodium alginate.
7. The aqueous high permeability wave absorbing plate of claim 1, wherein the cross-linking agent is one or more of blocked aqueous isocyanate, propylene oxide compound, aziridine compound, amino resin, MOCA, dicumyl peroxide, 3, 5 dimethylthiotoluenediamine (DMTDA).
8. The method for preparing a wave-absorbing plate according to any one of claims 1 to 7, comprising the steps of:
s10: stirring and dispersing an absorbent, a water-based thermoplastic binder, a dispersing agent, a defoaming agent, a thickening agent, a cross-linking agent and deionized water into uniform slurry;
wherein, the absorbent accounts for 80 to 200 parts; 10-50 parts of the water-based thermoplastic binder; 100 portions and 300 portions of deionized water; the addition amount of the dispersant is 0.1-1% of the mass of the slurry; the addition amount of the defoaming agent is 0.1-1% of the mass of the slurry; the addition amount of the thickening agent is 0.1-1% of the mass of the slurry; the addition amount of the cross-linking agent is 1-50% of the solid content in the aqueous thermoplastic binder;
s20: coating the slurry, and volatilizing water to form a coating;
s30: and carrying out hot-pressing crosslinking on the coating to obtain the wave absorbing plate.
9. The method according to claim 8, wherein step S20 includes:
s21: coating the slurry in a blade coating mode;
s22: and the microwave and hot air are combined for volatilizing the moisture in the slurry to form the coating.
10. The method of manufacturing of claim 8, wherein the hot pressing conditions are as follows:
when the wave absorbing plate is required to be a sheet, a vacuumizing flat vulcanizing machine is adopted, the hot pressing temperature is 150-190 ℃, and the pressure is 5-50 Mpa;
when the wave absorbing plate is required to be a coiled material, a roller type continuous vulcanizing machine is adopted, the hot pressing temperature is 170-210 ℃, and the pressure is 2-10 Mpa.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113801437A (en) * | 2021-10-21 | 2021-12-17 | 航天特种材料及工艺技术研究所 | Wave-absorbing epoxy resin, wave-absorbing epoxy resin composite material and preparation method thereof |
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| CN114316697A (en) * | 2022-01-25 | 2022-04-12 | 东莞天卫电磁技术有限公司 | Water-soluble wave-absorbing slurry, wave-absorbing film and preparation method thereof |
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