CN108641299B - Microwave color development composite material and preparation method thereof - Google Patents
Microwave color development composite material and preparation method thereof Download PDFInfo
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- CN108641299B CN108641299B CN201810517397.XA CN201810517397A CN108641299B CN 108641299 B CN108641299 B CN 108641299B CN 201810517397 A CN201810517397 A CN 201810517397A CN 108641299 B CN108641299 B CN 108641299B
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K2003/2275—Ferroso-ferric oxide (Fe3O4)
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
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Abstract
A microwave color development composite material and its preparation method, this composite material includes laminating the shielding layer, developing layer, absorbing layer connected sequentially, the shielding layer is a glass fiber fabric or light-colored chemical fiber fabric coated with paraffin; the color development layer is a natural fiber fabric, a chemical fiber fabric or a film material with a dyed and/or printed pattern; the wave-absorbing layer is a fabric woven by fibers of the wave-absorbing powder coating or a fabric of the wave-absorbing powder coating, and the shielding layer, the color development layer and the wave-absorbing layer are sequentially laminated and then compounded with epoxy resin to obtain the microwave color development composite material. When the composite material is irradiated by microwaves, the wave absorbing layer absorbs the waves and generates heat to enable the temperature of the composite material to rise to be above 60 ℃, white paraffin of the shielding layer is melted and becomes transparent, and the color or the pattern of the color development layer is displayed; when the microwave irradiation is turned off, the paraffin is solidified, and the composite material is recovered to be white, so that the microwave color development is realized, and the method is simple and easy to implement, and has wide application in the fields of electronic product shells, advertisement industry and the like.
Description
Technical Field
The invention belongs to the field of new materials, and particularly relates to a microwave color development composite material and a preparation method thereof.
Background
With the rapid development of the electronic information industry and the field of new materials, people increasingly have wide requirements on materials with certain mechanical properties and special functions. The color developing material refers to a material with a certain color change under certain conditions, such as electrification, heating, microwave and the like. Such color developing materials have great demands in the fields of smart materials, electronic product housings, advertisements, and the like.
The color development material generally refers to an electrochromic, temperature-sensitive color-change or photosensitive color development coating material. Typical representatives of electrochromic materials are tungsten trioxide and polythiophene and derivatives thereof, viologen, tetrathiafulvalene, metal phthalocyanine compounds and the like. Electrochromic materials using viologen as a functional material have been put to practical use. Photochromic materials are materials that change color when excited by a light source. In the 60's of the 20 th century, the corning studio in the united states first discovered the reversible photochromic properties of silver halide-containing glasses and developed photochromic eyewear. However, due to its high cost and complex processing technology, it is not suitable for manufacturing large-area photochromic glass, and thus, its commercial application in the building field is limited. The thermochromic pigment is used for realizing color conversion by changing the molecular structure of an organic substance due to electron transfer at a specific temperature. The color-changing substance not only has bright color, but also can realize color change from a' colored state to a colorless state. However, the light resistance of the thermochromic pigment is poor, and the thermochromic pigment can fade and lose efficacy quickly under the exposure of strong sunlight, so that the irradiation of strong sunlight and ultraviolet light is avoided, the service life of the thermochromic pigment is prolonged, and the thermochromic pigment is only suitable for indoor use.
Disclosure of Invention
The invention aims to provide a microwave color development composite material and a preparation method thereof, the composite material can develop colors and patterns under microwave irradiation, can be repeatedly used in the microwave irradiation process, is simple and easy to implement, has low cost, and can realize industrialization.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a microwave color development composite material comprises a shielding layer, a color development layer and a wave absorbing layer which are sequentially attached and connected, wherein the shielding layer is a glass fiber fabric or a non-dyed chemical fiber fabric coated with paraffin; the color development layer is a natural fiber fabric, a chemical fiber fabric or a film with a dyed and/or printed pattern; the wave-absorbing layer is a fabric woven by fibers of the wave-absorbing material coating, or the wave-absorbing layer is a fabric of the wave-absorbing material coating.
Preferably, the thickness of the fabric in the shielding layer is 0.5-2 mm, and the thickness of the paraffin coating is 0.1-3 mm.
Preferably, the non-dyed chemical fiber fabric in the shielding layer is a fabric woven by at least one of chemical fibers such as polyester fibers, polypropylene fibers and the like.
Preferably, the thickness of the color development layer is 10-500 micrometers, the thinner the thickness of the color development layer is, the better the heat conductivity is, the faster the paraffin of the shielding layer is melted, and the faster the microwave color development process is, the thickness of the color development layer is controlled within 10-500 micrometers, so that the heat transfer function is ensured no matter which material is selected by the color development layer, and the heat generated by the wave absorbing layer can be transferred to the shielding layer.
The color development layer in the invention can be a natural fiber fabric with a dyed and/or printed pattern, such as at least one of cotton fiber, wool fiber and hemp fiber; chemical fiber fabrics with dyeing and/or printing patterns can also be used; it may also be a film having a dyed and/or printed pattern.
Preferably, the wave-absorbing material is ferrite powder, carbon nano tubes or graphene and the like, and is uniformly coated on the surface of the fiber or fabric, wherein the coating thickness is 0.2-1 mm; at the moment, the wave-absorbing material can quickly generate heat under the action of microwaves.
The invention also provides a preparation method of the microwave color development composite material, which comprises the following steps:
1) making a shielding layer
Heating paraffin to be more than 60 ℃ to melt, and then uniformly coating the paraffin on the surface of a glass fiber fabric or a non-dyed chemical fiber fabric to obtain a shielding layer, wherein the thickness of the paraffin coating formed on the surface of the fabric in the shielding layer is 0.1-3 mm;
2) making wave-absorbing layer
Uniformly coating the wave-absorbing material on the surface of the fiber or fabric, wherein the thickness of the coating of the wave-absorbing material is 0.2-1 mm; weaving fibers of the wave-absorbing material coating into fabric serving as a wave-absorbing layer, or weaving the fabric of the wave-absorbing material coating into fabric serving as a wave-absorbing layer;
3) curing and forming
And paving the shielding layer, the color development layer and the wave absorption layer in sequence to form a prefabricated body, placing the prefabricated body in a mold, soaking an epoxy resin solution into the prefabricated body by using a VARTM (vacuum assisted transfer molding) method, curing and molding at room temperature, and demolding to obtain the microwave color development composite material.
The shielding layer, the color development layer and the wave absorption layer are sequentially layered and then compounded with epoxy resin to obtain the microwave color development composite material, wherein the shielding layer is composed of glass fiber fabrics coated with paraffin or impregnated with paraffin or non-dyed chemical fiber fabrics, and when the thickness of the fabrics is 0.5-2 mm, the fabrics in the shielding layer are also in a transparent or nearly transparent state after the paraffin coated on the shielding layer is melted. Therefore, when the composite material is in a microwave environment, the paraffin of the shielding layer is melted and becomes transparent by heat generated after the wave absorbing material in the wave absorbing layer absorbs the heat, so that the color and/or the pattern of the color development layer under the shielding layer are displayed, and the microwave color development is realized. And (4) closing the microwave irradiation, cooling and solidifying the paraffin in the shielding layer, and recovering the composite material to be white again. The microwave color development composite material disclosed by the invention is widely applied to the fields of electronic product shells, advertisement industries and the like.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention utilizes the principle that the wave-absorbing powder material generates heat in a microwave environment to ensure that the paraffin of the shielding layer in the composite material is melted and then the shielding layer becomes transparent, thereby showing the color and/or pattern of the color development layer under the shielding layer and realizing the microwave color development. The paraffin is transparent due to physical change under the heating condition (above 60 ℃), the process is a reversible process, and the paraffin in the shielding layer is solidified and recovered to be white after the microwave irradiation is turned off. Therefore, the microwave color development composite material provided by the invention can be repeatedly used for many times in the process of opening or closing the microwave irradiation, and has important application value in electronic product shells and advertisement industries.
2. The preparation method provided by the invention is simple and feasible, has low cost and can realize industrialization.
Drawings
Fig. 1 is a schematic structural view of a composite material according to embodiments 1 to 3 of the present invention, 1: shielding layer, 2: color development layer, 3: and a wave-absorbing layer.
Detailed Description
The invention is further illustrated by the following examples and figures. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Example 1: microwave color development composite material based on ferrite
(1) Selecting a glass fiber (megalithic group) fabric with the fineness of 400tex, wherein the density of the fabric is 10 pieces/cm, and the thickness of the fabric is 1 mm; paraffin (58 # by Hebei Pont chemical Co., Ltd.) is put into a heating tank and heated to 60 ℃ to be melted; the glass fiber fabric was dipped in paraffin so that the paraffin was coated on the surface of the glass fiber fabric to a thickness of 0.5 mm to form a white shielding layer fabric. A PVA plastic sheet printed with fonts is selected as a color development layer, and the thickness of the PVA plastic sheet is 200 microns. Selecting a glass fiber fabric coated with black ferrite powder (Shenzhen Taihai transmission mechanical accessory, Inc., model 0032), wherein the fiber fineness is 400tex, the fabric density is 10 pieces/cm, the glass fiber fabric is used as a wave absorbing layer, the particle size range of the black ferrite powder is 0.5-5 micrometers, and the coating thickness is 0.5 millimeter; the shielding layer, the color development layer and the wave-absorbing layer are cut into 10 cm by 10 cm fabrics, and the fabrics are sequentially layered (as shown in figure 1) and placed in a mould.
(2) Preparing epoxy resin (Guangzhou Hengyue chemical Co., Ltd., product number: E-44) and matched curing agent 651 polyamide according to the volume ratio of 4: relationship 1 300 ml of epoxy resin solution was prepared. And soaking the prepared epoxy resin solution into the shielding layer, the developing layer and the enhancement layer by a vacuum resin transfer molding process (VARTM), standing at room temperature for 24 hours for curing molding, and demolding to obtain the microwave developing composite material.
(3) The composite material is placed in a microwave irradiation environment with power of 20 watts, after 2 seconds, the white shielding fabric above the color development layer becomes transparent, the pattern of the color development fabric is displayed, and after the irradiation is closed for 30 seconds, the surface of the composite material recovers to be white.
Example 2: microwave color development composite material based on graphene coating
(1) A pure white polyester fabric (Shaoxing Kongshi-Chile-dyeing-Tertiary textile Co., Ltd.) with a fiber fineness of 200tex and a fabric density of 25 is selected, and the gram weight is about: 130 (g/m)2) The thickness is 2 mm; paraffin (58 # by Hebei Pont chemical Co., Ltd.) is put into a heating tank and heated to 60 ℃ to be melted; the glass fiber fabric is dipped into paraffin, and the paraffin is coated on the surface of the glass fiber fabric by a blade coating method, wherein the coating thickness is 0.1 mm, and a white shielding layer fabric is formed.
(2) The terylene printed fabric with the fiber fineness of 200tex and the fabric density of 20 pieces/cm is used as a color development layer and the thickness of 300 microns. Coating a polyester fabric with a graphene water-soluble suspension (Wikigaokou carbon material Co., Ltd., lamella thickness: 10-15nm) coating layer with a thickness of 0.3 mm; the shielding layer, the color development layer and the wave-absorbing layer are cut into 10 cm by 10 cm fabrics, and the fabrics are sequentially layered (as shown in figure 1) and placed in a mould.
(3) Preparing epoxy resin (Guangzhou Hengyue chemical Co., Ltd., product number: E-44) and matched curing agent 651 polyamide according to the volume ratio of 4: relationship 1 300 ml of epoxy resin solution was prepared. Soaking the prepared epoxy resin solution into the fabric through a vacuum resin transfer molding process, standing at room temperature for 24 hours for curing molding, and demolding to obtain the microwave color development composite material.
(4) The composite material is placed in a microwave irradiation environment with power of 20 watts, after 2 seconds, the white shielding fabric above the color development layer becomes transparent, the pattern of the color development fabric is displayed, and after the irradiation is closed for 30 seconds, the surface of the composite material recovers to be white.
Example 3: microwave color development composite material based on carbon nano tube coating
(1) Selecting a glass fiber (megalithic group) fabric with the fineness of 400tex, wherein the density of the fabric is 10 pieces/cm, and the thickness of the fabric is 0.5 mm; paraffin (58 # by Hebei Pont chemical Co., Ltd.) is put into a heating tank and heated to 60 ℃ to be melted; the glass fiber fabric was dipped in paraffin so that the paraffin was coated on the surface of the glass fiber fabric to a thickness of 1 mm to form a white shielding layer fabric. The cotton fabric with the printed pattern is used as a color development layer, and the thickness is 400 mm. Selecting a glass fiber fabric coated with 1% by weight of carbon nanotube suspension (Shenzhen Tuoling evolution science and technology Limited, 30-60nm in carbon tube diameter), uniformly coating the carbon nanotube suspension on the surface of the fabric by a blade coating method, wherein the coating thickness is 0.4 mm, the fiber fineness is 400tex, and the fabric density is 10 pieces/cm, and the glass fiber fabric is used as a wave-absorbing layer; the shielding layer, the color development layer and the wave-absorbing layer are cut into 10 cm by 10 cm fabrics, and the fabrics are sequentially layered (as shown in figure 1) and placed in a mould.
(2) Preparing epoxy resin (Guangzhou Hengyue chemical Co., Ltd., product number: E-44) and matched curing agent 651 polyamide according to the volume ratio of 4: relationship 1 300 ml of epoxy resin solution was prepared. Soaking the prepared epoxy resin solution into the fabric through a vacuum resin transfer molding process, standing at room temperature for 24 hours for curing molding, and demolding to obtain the microwave color development composite material.
(3) The composite material is placed in a microwave irradiation environment with power of 20 watts, after 2 seconds, the white shielding fabric above the color development layer becomes transparent, the pattern of the color development fabric is displayed, and after the irradiation is closed for 30 seconds, the surface of the composite material recovers to be white.
Claims (6)
1. The microwave color-developing composite material is characterized by comprising a shielding layer, a color-developing layer and a wave-absorbing layer which are sequentially attached and connected, wherein the shielding layer is a glass fiber fabric or a light-colored chemical fiber fabric coated with paraffin; the color development layer is a natural fiber fabric, a chemical fiber fabric or a film with a dyed and/or printed pattern; the wave-absorbing layer is a fabric coated with a wave-absorbing material;
the light-colored chemical fiber fabric in the shielding layer is a fabric woven by at least one of polyester fibers and polypropylene fibers;
the thickness of the fabric in the shielding layer is 0.5-2 mm, and the thickness of the paraffin coating is 0.1-3 mm.
2. The microwave color-developing composite material according to claim 1, wherein the natural fiber fabric in the color-developing layer is at least one of cotton fiber, wool fiber and hemp fiber.
3. The microwave color-developing composite material according to claim 1 or 2, wherein the thickness of the color-developing layer is 10 to 500 μm.
4. The microwave color development composite material of claim 1, wherein the wave-absorbing material is ferrite powder, carbon nanotubes or graphene.
5. The microwave color-developing composite material according to claim 1, wherein the thickness of the coating of the wave-absorbing material in the wave-absorbing layer is 0.2-1 mm.
6. The method for preparing a microwave-chromogenic composite material as claimed in any one of claims 1 to 5, comprising:
1) making a shielding layer
Heating paraffin to more than 60 ℃ to melt, and then uniformly coating the paraffin on the surface of a glass fiber fabric or a light-colored chemical fiber fabric to obtain a shielding layer, wherein the thickness of the paraffin coating formed on the surface of the fabric in the shielding layer is 0.1-3 mm, and the light-colored chemical fiber fabric is a fabric woven by at least one of polyester fibers and polypropylene fibers;
2) making wave-absorbing layer
Uniformly coating the wave-absorbing material on the surface of the fiber, wherein the thickness of the coating of the wave-absorbing material is 0.2-1 mm; weaving fibers of the wave-absorbing material coating into fabric as a wave-absorbing layer;
or uniformly coating the wave-absorbing material on the surface of the fabric, wherein the thickness of the coating of the wave-absorbing material is 0.2-1 mm, and taking the obtained fabric coated with the wave-absorbing material coating as a wave-absorbing layer;
3) curing and forming
Sequentially paving the shielding layer, the developing layer and the wave-absorbing layer in a mould, soaking the epoxy resin solution into the shielding layer, the developing layer and the wave-absorbing layer by using a VARTM method, curing and molding at room temperature, and demolding to obtain the microwave developing composite material.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0636863U (en) * | 1992-10-27 | 1994-05-17 | パイロットインキ株式会社 | Reversible thermochromic laminate |
| EP1264707A2 (en) * | 2001-05-14 | 2002-12-11 | Oji Paper Co., Ltd. | Thermosensitive recording material and novel color developer compounds |
| CN105022176A (en) * | 2015-09-02 | 2015-11-04 | 福建师范大学 | Electrochromic device |
| CN108003841A (en) * | 2017-12-04 | 2018-05-08 | 合肥联宝信息技术有限公司 | Waveguide hot material and its preparation method and application is inhaled in a kind of phase transformation |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0636863U (en) * | 1992-10-27 | 1994-05-17 | パイロットインキ株式会社 | Reversible thermochromic laminate |
| EP1264707A2 (en) * | 2001-05-14 | 2002-12-11 | Oji Paper Co., Ltd. | Thermosensitive recording material and novel color developer compounds |
| CN105022176A (en) * | 2015-09-02 | 2015-11-04 | 福建师范大学 | Electrochromic device |
| CN108003841A (en) * | 2017-12-04 | 2018-05-08 | 合肥联宝信息技术有限公司 | Waveguide hot material and its preparation method and application is inhaled in a kind of phase transformation |
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Address after: Room 274, 169-5 Fangshui Road, Jiangbei new district, Nanjing, Jiangsu 210047 Patentee after: Hecan new material technology (Nanjing) Co.,Ltd. Address before: 314500 a-11, Xinghe investment and entrepreneurship Park, Gaoqiao Town, Tongxiang City, Jiaxing City, Zhejiang Province Patentee before: JIAXING PULILONG COMPOSITE MATERIALS Co.,Ltd. |