CN114853422B - Wave-absorbing foam and preparation method thereof - Google Patents
Wave-absorbing foam and preparation method thereof Download PDFInfo
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- CN114853422B CN114853422B CN202210529067.9A CN202210529067A CN114853422B CN 114853422 B CN114853422 B CN 114853422B CN 202210529067 A CN202210529067 A CN 202210529067A CN 114853422 B CN114853422 B CN 114853422B
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- 239000006260 foam Substances 0.000 title claims abstract description 102
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000004568 cement Substances 0.000 claims abstract description 60
- 229920005989 resin Polymers 0.000 claims abstract description 50
- 239000011347 resin Substances 0.000 claims abstract description 50
- 239000002250 absorbent Substances 0.000 claims abstract description 47
- 230000002745 absorbent Effects 0.000 claims abstract description 47
- 239000002952 polymeric resin Substances 0.000 claims abstract description 44
- 229920003002 synthetic resin Polymers 0.000 claims abstract description 44
- 239000000203 mixture Substances 0.000 claims abstract description 39
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 37
- 239000000463 material Substances 0.000 claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000002002 slurry Substances 0.000 claims abstract description 18
- 238000005303 weighing Methods 0.000 claims abstract description 15
- 239000004088 foaming agent Substances 0.000 claims abstract description 14
- 239000000843 powder Substances 0.000 claims abstract description 14
- 239000000725 suspension Substances 0.000 claims abstract description 14
- 239000003381 stabilizer Substances 0.000 claims abstract description 12
- 238000003756 stirring Methods 0.000 claims description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 14
- 239000006261 foam material Substances 0.000 claims description 10
- 229920002635 polyurethane Polymers 0.000 claims description 7
- 239000004814 polyurethane Substances 0.000 claims description 7
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical group OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 6
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 239000011247 coating layer Substances 0.000 claims description 6
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 5
- 239000011398 Portland cement Substances 0.000 claims description 5
- 239000004917 carbon fiber Substances 0.000 claims description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 5
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 3
- NWGKJDSIEKMTRX-AAZCQSIUSA-N Sorbitan monooleate Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O NWGKJDSIEKMTRX-AAZCQSIUSA-N 0.000 claims description 3
- 235000021355 Stearic acid Nutrition 0.000 claims description 3
- 239000006229 carbon black Substances 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 3
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 3
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 3
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 3
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 3
- 239000008117 stearic acid Substances 0.000 claims description 3
- 239000004593 Epoxy Substances 0.000 claims description 2
- 239000011358 absorbing material Substances 0.000 abstract description 5
- 238000005187 foaming Methods 0.000 description 33
- 239000003822 epoxy resin Substances 0.000 description 8
- 229920000647 polyepoxide Polymers 0.000 description 8
- 238000002310 reflectometry Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 230000006835 compression Effects 0.000 description 5
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 4
- 230000032683 aging Effects 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 238000006731 degradation reaction Methods 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 4
- 238000007493 shaping process Methods 0.000 description 4
- 238000010008 shearing Methods 0.000 description 4
- 239000010410 layer Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229920005749 polyurethane resin Polymers 0.000 description 3
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 3
- 239000004925 Acrylic resin Substances 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 2
- 229920005830 Polyurethane Foam Polymers 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 210000000497 foam cell Anatomy 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 229910010272 inorganic material Inorganic materials 0.000 description 2
- 239000011147 inorganic material Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229920001228 polyisocyanate Polymers 0.000 description 2
- 239000005056 polyisocyanate Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000011496 polyurethane foam Substances 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 229920002994 synthetic fiber Polymers 0.000 description 2
- 239000008399 tap water Substances 0.000 description 2
- 235000020679 tap water Nutrition 0.000 description 2
- 241000746375 Andrographis Species 0.000 description 1
- 229920006934 PMI Polymers 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 210000000077 angora Anatomy 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229920007790 polymethacrylimide foam Polymers 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/02—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding chemical blowing agents
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/10—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by using foaming agents or by using mechanical means, e.g. adding preformed foam
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/42—Pore formers
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/48—Foam stabilisers
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00258—Electromagnetic wave absorbing or shielding materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The invention discloses wave-absorbing foam, and belongs to the technical field of wave-absorbing materials. The wave-absorbing foam consists of the following materials in parts by mass: 50 parts of cement powder; 30-50 parts of water; 0.5-10 parts of a foam stabilizer; 0.5-10 parts of a foaming agent; 5-30 parts of polymer resin; 1-20 parts of a resin curing agent; 5-100 parts of electromagnetic wave absorbent. The invention also provides a preparation method of the wave-absorbing foam, which comprises the following steps: s1, weighing a resin curing agent and water in proportion to obtain a mixture A; s2, weighing 1/3-1/2 mass fraction of polymer resin and electromagnetic wave absorbent to obtain a mixture B; s3, adding the mixture B into the mixture A to obtain a suspension C; s4, adding cement powder, a foam stabilizer, a foaming agent and the remaining mass of polymer resin into the suspension C to obtain wave-absorbing foam slurry; and S5, pouring the wave-absorbing foam slurry into a mold to obtain the wave-absorbing foam block.
Description
Technical Field
The invention relates to the technical field of wave-absorbing materials, in particular to wave-absorbing foam and a preparation method thereof.
Background
The organic wave-absorbing foam material represented by the polyurethane foam wave-absorbing material and the multi-layer PMI wave-absorbing foam has the characteristics of light weight, high strength, high electromagnetic wave absorption strength, wide absorption frequency band range and the like, is very suitable for the requirements of light weight and high performance of products in aerospace, and is widely applied to the aerospace field in recent years. However, the materials are expensive, have poor temperature resistance (no more than 300 ℃), have poor dimensional stability (the thermal expansion coefficient is 50 x 10 < -5 >/K), and limit the popularization and application of the materials in the field of ground equipment.
The cement inorganic foaming material has the characteristics of low price, high temperature resistance (600 ℃ resistance for a long time), good dimensional stability (thermal expansion coefficient is 1 x 10-5/K) and the like, has excellent electromagnetic wave absorption capacity after being compounded with an electromagnetic wave absorbent, and has more and more attention in the fields of ground equipment, particularly ground fixing equipment, such as defense industry, hangar, temporary command post and the like in recent years. The traditional cement inorganic foaming material only simply adds the electromagnetic wave absorbent into the cement foaming material in a blending way to form wave-absorbing foam, a large amount of the electromagnetic wave absorbent causes serious foam slag falling, poor processability and difficult secondary processing, thus influencing popularization and application, and metal electromagnetic wave absorbents such as iron powder and the like are easy to cause performance degradation due to moisture absorption and corrosion, thus influencing further popularization and application.
Disclosure of Invention
The wave-absorbing foam provided by the invention can obstruct the contact of an electromagnetic wave absorbent and water, prevent the performance degradation caused by oxidation and corrosion of the electromagnetic wave absorbent, and has good processing performance and surface quality.
The invention also provides a preparation method of the wave-absorbing foam, which is used for preparing the wave-absorbing foam.
The wave-absorbing foam consists of the following materials in parts by mass:
more preferably, the polymer resin is 10-20 parts by mass, and the resin curing agent is 5-15 parts by mass.
Preferably, the cement powder is one or more of portland cement, sulphoaluminate cement and ferro-aluminate cement.
Preferably, the foam stabilizer is one or more of stearic acid, span 80 and sodium dodecyl sulfate.
Preferably, the foaming agent is hydrogen peroxide.
More preferably, the polymer resin is an aqueous resin.
More preferably, the molecular structure type of the polymer resin is a waterborne polyurethane system, a waterborne acrylic system or a waterborne epoxy resin system.
More preferably, the polymer resin is a room temperature curing resin, and the gel time of the room temperature curing resin is 2-5 times of the setting time of the cement foaming material.
More preferably, the electromagnetic wave absorbent is one or a mixture of carbon black, spherical iron powder, flaky iron powder, chopped carbon fiber and chopped silicon carbide fiber.
A preparation method for preparing the wave-absorbing foam comprises the following steps:
s1, weighing a resin curing agent and water in proportion, adding the resin curing agent into the water, and uniformly dispersing to obtain a mixture A;
s2, weighing 1/3-1/2 mass fraction of polymer resin and electromagnetic wave absorbent, and stirring for 2-4 h to enable the polymer resin to fully wet the electromagnetic wave absorbent to obtain a mixture B;
s3, adding the mixture B into the mixture A, stirring at a rotating speed of 50-100r/min to enable the polymer resin on the surface of the electromagnetic wave absorbent and the resin curing agent in the mixture A to generate a curing reaction, and forming a resin coating layer on the surface of the electromagnetic wave absorbent to obtain a suspension C;
s4, adding cement powder, a foam stabilizer, a foaming agent and the remaining mass part of polymer resin into the suspension C, and uniformly stirring to obtain wave-absorbing foam slurry;
and S5, pouring the wave-absorbing foam slurry into a mould, and curing the polymer resin gel after the cement foam material is foamed, shaped and hardened to obtain the wave-absorbing foam block.
The invention provides a wave-absorbing foam, which is characterized in that a polymer resin component is introduced into a wave-absorbing material, the polymer resin can form a layer of protective film in situ on the surface of an electromagnetic wave absorbent to prevent the electromagnetic wave absorbent from contacting with external moisture, and the polymer resin is gradually precipitated and solidified in the foaming and solidifying process of a cement foaming material by utilizing the incompatibility principle of a cement inorganic material and the polymer resin, so that the cement foaming material is subjected to hole sealing, the contact of the electromagnetic wave absorbent and the moisture is further prevented, and the performance degradation caused by oxidation and corrosion of the cement foaming material is prevented. Meanwhile, compared with the existing cement inorganic wave-absorbing foam material and polymer organic wave-absorbing foam material, the foam material has the following advantages:
(1) Good processability and surface quality: the surface of the wave-absorbing foam material is covered by the polymer resin material to form a layer of film to be bonded together, so that the problems of slag falling, uneven surface, poor surface quality, low foam bonding strength during subsequent construction and easiness in debonding in the traditional cement inorganic foam processing process are solved;
(2) Excellent environmental resistance: the surface of the electromagnetic wave absorbent in the wave absorbing foam is uniformly coated by the polymer resin, so that the corrosion of external moisture and cement components on the electromagnetic wave absorbent such as ferrite is effectively prevented, and the problem of performance degradation caused by poor environment resistance in the use process of the traditional inorganic wave absorbing material is avoided;
(3) Excellent compressive strength: the polymer resin is separated out on the surface of the cement foaming material and fills micropores on the wall of the cement foaming material, so that the compressive strength of the cement foaming material is improved by more than 30% compared with the traditional cement inorganic foam.
(4) Excellent high temperature resistance and dimensional stability: the skeleton of the wave-absorbing foam is made of cement inorganic materials, and compared with the traditional polymer organic foam, the wave-absorbing foam has excellent high-temperature resistance and dimensional stability, the temperature resistance is improved to 600 ℃ from below 300 ℃ of the organic foam, and the thermal expansion coefficient is reduced to 1 × 10-5 from 50 × 10-5/K of the organic foam.
(5) The low-cost effect is remarkable: the cost is only 1/10-1/3 of that of organic foams such as PMI foam, polyimide foam, epoxy foam or polyurethane foam and the like.
The invention also provides a preparation method of the wave-absorbing foam, which is used for preparing the wave-absorbing foam.
Drawings
FIG. 1 is a graph of reflectivity data for example 1 of the present invention;
FIG. 2 is a graph of reflectivity data for example 2 of the present invention;
FIG. 3 is a graph of reflectivity data for example 3 of the present invention;
FIG. 4 is a graph of reflectance data for comparative example 1 of the present invention.
Detailed Description
An embodiment of the present invention will be described in detail below with reference to the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the embodiment.
The embodiment of the invention provides wave-absorbing foam which is prepared from the following materials in parts by mass:
the cement powder has no special requirement, and can be portland cement, sulphoaluminate cement, ferroaluminate cement or any other system capable of being used for preparing cement foam;
the water has no special requirement and can be tap water, distilled water, purified water, rainwater and the like;
the foam stabilizer is one or more of stearic acid, span 80 and sodium dodecyl sulfate.
The foaming agent is hydrogen peroxide.
The polymer resin is required to be aqueous resin, the molecular structure type of the resin can be an aqueous polyurethane system, an aqueous acrylic acid system, an aqueous epoxy resin system and the like, the aqueous polyurethane system can be AH-0201A and AH-0201AF of Angora China, the aqueous acrylic acid system can be AR648A and AS2810A of Fangjing synthetic materials Co., ltd of Dongguan city, the aqueous epoxy resin system can be GS-730A and GS740A of Changzhou Guangshu chemical engineering Co., ltd, and the variety and the brand of the aqueous resin can include but are not limited to the above brands.
The resin curing agent is required to be a curing agent matched with water-based resin, the molecular structure type of the resin can be a water-based polyurethane system, a water-based acrylic acid system, a water-based epoxy resin system and the like, the water-based polyurethane system curing agent can be an Andrographis A05 polyisocyanate curing agent, the water-based acrylic acid system curing agent can be an amino curing agent 717 and an amino curing agent 325 from Fangguan synthetic materials Co., ltd, the water-based epoxy resin system curing agent can be a Kyowa Guanshu chemical engineering science and technology Co., ltd GS-730B and GS740B, the varieties and brands of the water-based resin curing agent include but are not limited to the brands, and all substances capable of curing the water-based resin in a cement system can be used as the curing agent. The resin curing agent is used in an amount to cure the polymer resin to obtain suitable properties.
If the organic system composed of the polymer resin and the resin curing agent is a room temperature curing resin system, the gel time of the organic system is required to be longer than the foaming and setting time of the cement foaming material, namely the polymer resin is required to start gel curing after the foaming and setting of foam cells of the cement foaming material are finished, otherwise, the foam framework formation of the cement foaming material is influenced, organic matters cannot be separated out on the surface of the foam cells, the requirements of the invention cannot be met, the performance of the foam is finally influenced, the room temperature gel time of the polymer resin is generally required to be 2-5 times of the setting time of the cement foaming material, the efficiency and the forming of large-size products are comprehensively considered, and the gel time of the polymer resin is preferably 2-3 times of the cement foaming and setting time.
When the organic system composed of the polymer resin and the resin curing agent is a high-temperature curing organic polymer system which does not gel at room temperature, the organic system is not limited by the factors, and can be placed into a drying room or an oven for heating and curing after the foam of the cement foaming material is completely solidified and molded.
The electromagnetic wave absorbent may be one or a mixture of carbon black, spherical iron powder, flake iron powder, chopped carbon fiber and chopped silicon carbide fiber.
The preparation method for preparing the wave-absorbing foam comprises the following steps:
s1, weighing a resin curing agent and water in proportion, adding the resin curing agent into the water, and uniformly dispersing by using a high-speed shearing dispersion machine to obtain a mixture A; because the cement foaming material contains more components including water, foaming agent, cement powder and the like, the cement foaming material in the application adopts the cement foaming material in the prior art, has no special requirement and can be used according to the conventional proportion. The mass of the water in the step refers to the mass of the water with the required proportion in the cement foaming material in corresponding mass parts, and the balance is the foaming agent, the cement powder and other components in the cement foaming material.
S2, weighing 1/3-1/2 mass fraction of polymer resin and electromagnetic wave absorbent, and stirring for 2-4 h to enable the polymer resin to fully wet the electromagnetic wave absorbent to obtain a mixture B;
s3, adding the mixture B into the mixture A, stirring at a rotating speed of 50-100r/min to enable the polymer resin on the surface of the electromagnetic wave absorbent and the resin curing agent in the mixture A to generate a curing reaction, and forming a resin coating layer on the surface of the electromagnetic wave absorbent to obtain a suspension C;
s4, adding cement powder, a foaming agent, a foam stabilizer and the remaining parts by mass of polymer resin into the suspension C, and uniformly stirring to obtain wave-absorbing foam slurry;
and S5, pouring the wave-absorbing foam slurry into a mould, and curing the polymer resin gel after the cement foam material is foamed, shaped and hardened to obtain the wave-absorbing foam block.
Example 1:
the embodiment provides a wave-absorbing foam, which is composed of the following materials in parts by mass:
the performance parameters of the waterborne polyurethane resin are as follows:
| type (2): | aqueous polyurethane | Viscosity: | greater than or equal to 100mPa.s (viscosity adjustable) |
| Appearance: | milky white liquid | Solid content: | 40±1％ |
| PH： | 6-9 | softening point: | 55-60℃ |
| specific gravity: | 1.06±0.02g/cm 3 | temperature resistance: | 60 deg.C (Single component) |
A preparation method for preparing the wave-absorbing foam comprises the following steps:
s1, weighing 40 parts by mass of water and 15 parts by mass of A05 polyisocyanate curing agent, adding the resin curing agent into the water, and uniformly dispersing by using a high-speed shearing dispersion machine to obtain a mixture A for later use;
s2, weighing 10 parts by mass of AH-0201A aqueous polyurethane resin and 50 parts by mass of carbonyl iron powder electromagnetic wave absorbent, and stirring for 2 hours to enable the resin to fully wet the carbonyl iron powder electromagnetic wave absorbent to obtain a mixture component B for later use;
s3, slowly adding the mixture B into the mixture A, keeping the rotating speed of 50-100r/min, enabling resin on the surface of the electromagnetic wave absorbent and a resin curing agent in the mixture A to generate a curing reaction, and forming a resin coating layer on the surface of the electromagnetic wave absorbent to obtain a suspension C containing the electromagnetic wave absorbent;
s4, adding 50 parts by mass of cement powder, 5 parts by mass of a foam stabilizer, 5 parts by mass of a foaming agent and 10 parts by mass of AH-0201A aqueous polyurethane resin into the suspension C, and uniformly stirring to obtain wave-absorbing foam slurry;
s5, pouring the wave-absorbing foam slurry into a 300 x 100mm mould, foaming the cement foaming material, shaping and hardening, solidifying the polymer resin gel, and obtaining a wave-absorbing foam block after the foam surface is not sticky;
and S6, processing the wave-absorbing foam block into a 300-40mm foam block, and testing the room-temperature compression strength and reflectivity.
Example 2
The embodiment provides a wave-absorbing foam, which is composed of the following materials in parts by mass:
a preparation method for preparing the wave-absorbing foam comprises the following steps:
s1, weighing 35 parts by mass of water, 5 parts by mass of amino curing agent 717 and 10 parts by mass of chopped carbon fiber electromagnetic wave absorbent, adding a resin curing agent into the water, and uniformly dispersing the resin curing agent by using a high-speed shearing dispersion machine to obtain a mixture A for later use;
s2, weighing 4 parts by mass of AR648A water-based acrylic resin and 60 parts by mass of carbonyl iron powder electromagnetic wave absorbent, stirring for 2 hours to enable the resin to fully wet the carbonyl iron powder electromagnetic wave absorbent, and obtaining a mixture component B for later use;
s3, slowly adding the mixture B into the mixture A, keeping the rotating speed of 50-100r/min, enabling resin on the surface of the electromagnetic wave absorbent and a resin curing agent in the mixture A to generate a curing reaction, and forming a resin coating layer on the surface of the electromagnetic wave absorbent to obtain a suspension C containing the electromagnetic wave absorbent;
s4, adding 50 parts by mass of sulphoaluminate cement powder, 6 parts by mass of a foam stabilizer, 9 parts by mass of a foaming agent and 6 parts by mass of AR648A aqueous acrylic resin into the suspension C, and uniformly stirring to obtain a wave-absorbing foam slurry;
s5, pouring the wave-absorbing foam slurry into a 300 x 100mm mold, foaming the cement foaming material, shaping and hardening, solidifying the polymer resin gel, and obtaining a wave-absorbing foam block after the surface of the foam is not sticky;
and S6, processing the wave-absorbing foam block material into a foam block with the thickness of 300-40mm, and testing the room-temperature compression strength and the reflectivity.
Example 3
The embodiment provides a wave-absorbing foam, which is composed of the following materials in parts by mass:
the preparation method for preparing the wave-absorbing foam comprises the following steps:
s1, weighing 40 parts by mass of water, 20 parts by mass of GS-730B curing agent and 5 parts by mass of chopped carbon fiber electromagnetic wave absorbent, adding the resin curing agent into the water, and uniformly dispersing by using a high-speed shearing dispersion machine to obtain a mixture A for later use;
s2, weighing 13 parts by mass of GS-730A waterborne epoxy resin and 100 parts by mass of carbonyl iron powder electromagnetic wave absorbent, and stirring for 2 hours to enable the GS-730A waterborne epoxy resin to fully wet the carbonyl iron powder electromagnetic wave absorbent to obtain a mixture component B for later use;
s3, slowly adding the mixture B into the mixture A, keeping the rotating speed of 50-100r/min, enabling resin on the surface of the electromagnetic wave absorbent and a resin curing agent in the mixture A to generate a curing reaction, and forming a resin coating layer on the surface of the electromagnetic wave absorbent to obtain a suspension C containing the electromagnetic wave absorbent;
s4, adding the other components except water of the cement foaming material and 12 parts by mass of GS-730A water-based epoxy resin into the suspension C, and uniformly stirring to obtain wave-absorbing foam slurry;
s5, pouring the wave-absorbing foam slurry into a 300 x 100mm mould, foaming the cement foaming material, shaping and hardening, solidifying the polymer resin gel, and obtaining a wave-absorbing foam block after the foam surface is not sticky;
and S6, processing the wave-absorbing foam block into a 300-40mm foam block, and testing the room-temperature compression strength and reflectivity.
Comparative example 1
This example is a comparative example, and the formulation is composed of the following materials in parts by mass:
s1, weighing portland cement powder, tap water, a foam stabilizer and a foaming agent in proportion, and uniformly stirring to obtain a portland cement foaming slurry;
s2, adding carbonyl iron powder electromagnetic wave absorbent in a corresponding proportion into the foaming slurry, and uniformly stirring to obtain cement wave-absorbing foam slurry;
s3, pouring the cement wave-absorbing foam slurry into a 300 x 100mm mould, and after the cement foam material is foamed, shaping and hardening to obtain a cement wave-absorbing foam block material;
and S4, processing the wave-absorbing foam block into 300-40mm foam, and testing the room-temperature compression strength and reflectivity.
As can be seen from Table 1 and FIGS. 1-4, the foam of the present invention has excellent compressibility and environmental resistance, the compressibility before aging is higher than that of the inorganic foam with similar formulation (comparative example 1), and the decrease of either compressibility or reflectivity after aging at 25 deg.C and 70% humidity is much smaller than that of the inorganic foam.
| Example 1 | Example 2 | Example 3 | Comparative example 1 | |
| Density (kg/m) 3 ) | 216 | 218 | 216 | 216 |
| Compressive Strength before aging (MPa) | 0.65 | 0.68 | 0.67 | 0.46 |
| Compressive Strength after aging (MPa) | 0.51 | 0.53 | 0.50 | 0.21 |
| Coefficient of linear expansion (. About.10) -5 /K) | 0.9 | 0.9 | 1 | 1 |
TABLE 1 compression property at room temperature and linear expansion coefficient of wave-absorbing foam
The above disclosure is only for a few specific embodiments of the present invention, however, the present invention is not limited to the above embodiments, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present invention.
Claims (9)
1. The wave-absorbing foam is characterized by comprising the following materials in parts by mass:
50 parts of cement powder;
30-50 parts of water;
0.5-10 parts of a foam stabilizer;
0.5-10 parts of foaming agent;
5-30 parts of polymer resin;
1-20 parts of a resin curing agent;
5-100 parts of an electromagnetic wave absorbent;
the preparation method of the wave-absorbing foam comprises the following steps:
s1, weighing a resin curing agent and water in proportion, adding the resin curing agent into the water, and uniformly dispersing to obtain a mixture A;
s2, weighing 1/3 to 1/2 mass fraction of polymer resin and an electromagnetic wave absorbent, and stirring for 2 to 4 hours to enable the polymer resin to fully wet the electromagnetic wave absorbent to obtain a mixture B;
s3, adding the mixture B into the mixture A, stirring at a rotating speed of 50-100r/min to enable the polymer resin on the surface of the electromagnetic wave absorbent and the resin curing agent in the mixture A to generate a curing reaction, and forming a resin coating layer on the surface of the electromagnetic wave absorbent to obtain a suspension C;
s4, adding cement powder, a foam stabilizer, a foaming agent and the remaining parts by mass of polymer resin into the suspension C, and uniformly stirring to obtain wave-absorbing foam slurry;
and S5, pouring the wave-absorbing foam slurry into a mold, and curing the polymer resin gel after the cement foam material is foamed, shaped and hardened to obtain the wave-absorbing foam block.
2. The wave absorbing foam according to claim 1, wherein the polymer resin is 10-20 parts by mass and the resin curing agent is 5-15 parts by mass.
3. The foam according to claim 1, wherein the cement powder is one or more of portland cement, sulphoaluminate cement, and ferro-aluminate cement.
4. The wave absorbing foam according to claim 1, wherein the foam stabilizer is one or more of stearic acid, span 80 and sodium dodecyl sulfate.
5. The foam of claim 1, wherein the foaming agent is hydrogen peroxide.
6. A microwave absorbing foam according to claim 1 wherein said polymeric resin is an aqueous resin.
7. The wave absorbing foam of claim 6, wherein the polymer resin has a molecular structure of an aqueous polyurethane system, an aqueous acrylic system, or an aqueous epoxy system.
8. The wave absorbing foam of claim 1, wherein the polymer resin is a room temperature curing resin, and the gel time of the room temperature curing resin is 2-5 times of the setting time of the cement foam material.
9. The wave absorbing foam according to claim 1, wherein the electromagnetic wave absorbent is one or a mixture of carbon black, spherical iron powder, flake iron powder, chopped carbon fiber and chopped silicon carbide fiber.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102674881A (en) * | 2012-05-18 | 2012-09-19 | 大连理工大学 | A kind of absorbing foam concrete and preparation method thereof |
| CN102807385A (en) * | 2012-07-19 | 2012-12-05 | 江苏科技大学 | Cement-based waterborne epoxy resin foam heat insulation material and preparation method thereof |
| CN112625556A (en) * | 2020-11-24 | 2021-04-09 | 西安科锐盛创新科技有限公司 | Flexible coating with wave absorbing function |
| CN113930134A (en) * | 2021-11-30 | 2022-01-14 | 航天科工武汉磁电有限责任公司 | Wave-absorbing coating and preparation method thereof |
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| KR20140134909A (en) * | 2013-05-15 | 2014-11-25 | 한국과학기술원 | Cement-based Porous Construction Material Having Electro Magnetic Wave Absorption |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102674881A (en) * | 2012-05-18 | 2012-09-19 | 大连理工大学 | A kind of absorbing foam concrete and preparation method thereof |
| CN102807385A (en) * | 2012-07-19 | 2012-12-05 | 江苏科技大学 | Cement-based waterborne epoxy resin foam heat insulation material and preparation method thereof |
| CN112625556A (en) * | 2020-11-24 | 2021-04-09 | 西安科锐盛创新科技有限公司 | Flexible coating with wave absorbing function |
| CN113930134A (en) * | 2021-11-30 | 2022-01-14 | 航天科工武汉磁电有限责任公司 | Wave-absorbing coating and preparation method thereof |
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