CN115534456A - Flame-retardant conductive foam and preparation process thereof - Google Patents
Flame-retardant conductive foam and preparation process thereof Download PDFInfo
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- CN115534456A CN115534456A CN202211127517.8A CN202211127517A CN115534456A CN 115534456 A CN115534456 A CN 115534456A CN 202211127517 A CN202211127517 A CN 202211127517A CN 115534456 A CN115534456 A CN 115534456A
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- flame
- retardant
- foam
- conductive
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Images
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Abstract
A flame-retardant conductive foam and a preparation process thereof, comprising flame-retardant foam and conductive cloth; the outer layer of the flame-retardant foam is coated with conductive cloth; a flame-retardant layer is arranged between the flame-retardant foam and the conductive cloth; the flame-retardant foam comprises the following components in parts by weight: 25-35 parts of 107 silicon rubber, 15-25 parts of hexagonal boron nitride powder, 15-20 parts of a composite flame retardant, 8-10 parts of methyl terminated hydrogen-containing silicone oil, 5-8 parts of carbon nano tubes, 3-5 parts of vinyl-terminated silicone oil, 3-5 parts of methyl terminated silicone oil with vinyl on a side chain, 3-5 parts of fumed silica, 1-3 parts of an inhibitor, 0.5-1 part of an anti-aging agent and 0.5-1 part of a platinum catalyst. The flame-retardant conductive foam and the preparation process thereof have a simple structure, the formula of the foam is improved, the flame-retardant layer is arranged between the conductive fabric and the flame-retardant foam to improve the flame-retardant property of the conductive foam, and the flame-retardant grade of the prepared conductive foam reaches UL94-HF1.
Description
Technical Field
The invention belongs to the technical field of conductive foam, and particularly relates to flame-retardant conductive foam and a preparation process thereof.
Background
The conductive foam is a gap shielding material which is light, compressible and conductive, and is commonly used for providing conductive connection and shielding at gaps in electronic and electrical equipment. For example, the conductive foam is used for connecting a grounding point of the circuit board and a metal shell or a component, so that the consistency of the system ground potential is realized, and the electromagnetic radiation of the circuit board is reduced. In addition, the screen and keyboard of the mobile phone and the notebook computer can discharge the ESD static electricity to the product grounding wire by using the conductive foam, thereby improving the antistatic capability of the product.
In order to avoid great loss caused by fire accidents or short circuits, besides good electrical conductivity and electromagnetic shielding performance, the conductive foam also needs to have good flame retardant performance, so that flame propagation can be effectively prevented, and core products are protected from being damaged.
In the prior art, in order to improve the flame retardant property of the conductive foam, a flame retardant layer is usually arranged between the conductive fabric and the foam body. For example, chinese patent application No. CN201710896641.3 discloses a multilayer conductive foam with flame retardant property, which includes a foam body and a conductive cloth, the conductive cloth is wrapped on the outer surface of the foam body, the foam body includes a first conductive adhesive layer, a foam layer, a metal layer, and a second conductive adhesive layer, which are sequentially disposed from bottom to top, the foam layer includes a plurality of layers of split foam layers, a reinforcing layer is disposed between two adjacent split foam layers, a thermal insulation layer and a flame retardant layer are sequentially disposed on the outer side of the conductive cloth from inside to outside, the thermal insulation layer is formed by spraying a thermal insulation coating, and the flame retardant layer and the thermal insulation layer are used to achieve the purposes of retarding flame and preventing the fire source from spreading all around.
Set up fire-retardant layer between electrically conductive cloth and the cotton body of bubble and can play fire-retardant effect to electrically conductive bubble cotton, but also have some problems, for example the electric conductivity nature of conducting layer may have been reduced to fire-retardant layer, along with vibration and operating temperature's change, fire-retardant layer probably drops. Therefore, a flame-retardant conductive foam and a preparation process thereof need to be developed, on the premise of ensuring conductivity, the flame-retardant property of the conductive foam is improved by improving the formula of the foam and arranging a flame-retardant layer between the conductive fabric and the flame-retardant foam, and the flame-retardant grade of the prepared conductive foam reaches UL94-HF1.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects, the invention aims to provide the flame-retardant conductive foam and the preparation process thereof, the structure is simple, the flame-retardant performance of the conductive foam is improved by improving the formula of the foam and arranging the flame-retardant layer between the conductive fabric and the flame-retardant foam, the flame-retardant grade of the prepared conductive foam reaches UL94-HF1, and the application prospect is wide.
The purpose of the invention is realized by the following technical scheme:
the flame-retardant conductive foam comprises flame-retardant foam and conductive cloth; the outer layer of the flame-retardant foam is coated with conductive cloth; a flame-retardant layer is arranged between the flame-retardant foam and the conductive cloth;
the flame-retardant foam comprises the following components in parts by weight: 25-35 parts of 107 silicon rubber, 15-25 parts of hexagonal boron nitride powder, 15-20 parts of a composite flame retardant, 8-10 parts of methyl terminated hydrogen-containing silicone oil, 5-8 parts of carbon nano tubes, 3-5 parts of vinyl-terminated silicone oil, 3-5 parts of methyl terminated silicone oil with vinyl-terminated side chains, 3-5 parts of fumed silica, 1-3 parts of an inhibitor, 0.5-1 part of an anti-aging agent and 0.5-1 part of a platinum catalyst; the flame-retardant layer is prepared by coating flame-retardant liquid on the outer surface of the flame-retardant foam in a layer-by-layer self-assembly manner.
The flame-retardant conductive foam is simple in structure, the flame-retardant property of the conductive foam is improved by improving the formula of the foam and arranging the flame-retardant layer between the conductive fabric and the flame-retardant foam, and the flame-retardant grade of the prepared conductive foam reaches UL94-HF1.
Wherein the flame-retardant foam is prepared from 107 silicon rubber serving as a raw material and hexagonal boron nitride powderThe composite flame retardant is prepared by compounding a carbon nano tube as a heat-conducting filler, a composite flame retardant as a flame retardant, methyl terminated hydrogen-containing silicone oil and vinyl terminated silicone oil, and a side chain vinyl-containing methyl terminated silicone oil as a cross-linking agent, fumed silica, an inhibitor, an anti-aging agent and a platinum catalyst auxiliary agent, and has the advantages of quick foaming, closed-cell structure, uniform cell size and uniform distribution, the flame retardant grade reaches UL94-HF1, and the heat conductivity is more than 0.3/W (m.K) -1 The material has excellent mechanical property, and can play roles in buffering, flame retardance and heat conduction.
Further, the flame-retardant conductive foam comprises the following components in parts by mass: 50-60 parts of flame retardant Exolit AP 750, 25-35 parts of aluminum hydroxide powder and 45-15 parts of flame retardant Exolit RP 6145.
The invention adopts the compounding of a flame retardant Exolite AP, aluminum hydroxide powder and a flame retardant Exolite RP, wherein the flame retardant Exolite AP is a non-halogen additive flame retardant based on ammonium polyphosphate, the effect is exerted through the synergistic action of phosphorus/nitrogen, the aluminum hydroxide powder can not fully burn energy-saving flame retardant through dehydration, heat absorption and temperature reduction, the flame retardant Exolite RP is red phosphorus with high phosphorus content and good flame retardant effect, and is synergistic with the aluminum hydroxide powder.
Further, according to the flame-retardant conductive foam, the conductive fabric is a polyimide conductive fabric, and the polyimide conductive fabric is a plain weave fabric made of polyimide fibers along the radial direction of the conductive foam and plated metal polyimide fibers along the circumferential direction of the cross section of the conductive foam; the metal-plated polyimide fiber is any one of polyimide fiber copper plating, nickel plating, silver plating and gold plating, and the thickness of a metal layer of the metal-plated polyimide fiber is 0.1-2.0 mu m.
The conductive layer is made of polyimide fibers and plated metal polyimide fibers, the LOI of the polyimide fibers can reach more than 45%, the polyimide fibers do not burn, can be quickly shrunk and carbonized under flame of more than 300 ℃, and can keep certain strength, the plated metal polyimide fibers have excellent conductive performance, and the conductive performance of the conductive cloth is guaranteed, the using amount of the plated metal polyimide fibers is reduced, and the cost is reduced.
Further, the viscosity of the 107 silicon rubber of the flame-retardant conductive foam is 10000-20000mPa & s; the active hydrogen mole fraction of the methyl terminated hydrogen-containing silicone oil is 0.8-1.6%; the viscosity of the vinyl-terminated silicone oil is 10000-20000 mPas, and the vinyl mole fraction is 0.5-1.0%; the viscosity of the methyl terminated silicone oil with the side chain containing vinyl is 10000-20000mPa & s, and the vinyl mole fraction is 0.3-0.8%; the average grain diameter of the hexagonal boron nitride powder is 5-10 mu m; the average grain diameter of the carbon nano tube is 5-10nm; the fumed silica is fumed silica A380; the inhibitor is ethynyl cyclohexanol; the anti-aging agent is anti-aging agent BHT; the platinum catalyst is KE-808.
Further, foretell fire-retardant type electrically conducts the bubble cotton, be provided with the accommodation hole that a plurality of is used for holding the buffering post in the fire-retardant bubble is cotton uniformly, the buffering post sets up in the accommodation hole.
Further, foretell fire-retardant type electrically conducts bubble cotton, the buffer column is trapezoidal round platform or trapezoidal terrace with edge structure, the accommodation hole is for falling trapezoidal round platform or falling trapezoidal terrace with edge structure.
The accommodating hole and the buffer column are matched to improve the buffering and damping capacity of the conductive foam, and the accommodating hole and the buffer column are shaped to facilitate mechanical operation during manufacturing and maintain stable structure of the conductive foam when the conductive foam is stressed.
The invention also relates to a preparation process of the flame-retardant conductive foam, which comprises the following steps:
(1) Preparing flame-retardant foam: adding 107 silicon rubber, vinyl-terminated silicon oil and methyl-terminated silicon oil with vinyl-terminated side chains into a stirrer together for stirring, then sequentially adding hexagonal boron nitride powder, a composite flame retardant, a carbon nano tube, fumed silica, an inhibitor and an anti-aging agent, continuing to stir until the mixture is uniformly mixed, then sequentially adding methyl-terminated hydrogen-containing silicon oil and a platinum catalyst, continuing to stir until the mixture is uniformly mixed, simultaneously vacuumizing to remove air, finally coating the mixed material on the surface of a PET release film at 20 ℃, placing the PET release film in the air for 10-15min, and gradually foaming and molding the mixed material to obtain the flame-retardant foam;
(2) Preparation of the flame-retardant layer: soaking the flame-retardant foam in 0.1M nitric acid solution for 5-10min, washing with deionized water for 1-3min, and soaking the flame-retardant foam in 1% PAA solution for 1-3min; sequentially and alternately immersing the flame-retardant foam into a polyethylene sub-solution, a beta-iron oxyhydroxide solution and a sodium alginate solution for layer-by-layer self-assembly, wherein each immersion process lasts for 1-3min, then washing for 1-3min by using deionized water, and wringing to remove excessive water to obtain a layer of self-assembly, wherein the number of the self-assembly layers is 3-5; when the required layer number is reached, the flame-retardant foam is placed in an oven at 400-700 ℃ for drying overnight;
(3) Preparing conductive foam: and compounding and molding the conductive cloth and the flame-retardant foam with the flame-retardant layer to obtain the conductive foam.
The invention adopts a three-component assembly method to assemble the flame-retardant layer, and through the mode, the polyethylene, the beta-iron oxyhydroxide and the sodium alginate are combined together through electrostatic adsorption acting force, particularly the mutual diffusion effect between the polyethylene sub molecular chain and the sodium alginate molecular chain can increase the charge density on the surface of the beta-iron oxyhydroxide, thereby enhancing the adsorption force of the beta-iron oxyhydroxide, leading the beta-iron oxyhydroxide to be embedded and well distributed in a polymer coating layer formed by the polyethylene sub/sodium alginate, further well dispersing on the surface of the flame-retardant foam, and forming a closely-packed reticular structure which can well play a barrier effect, delay the release of combustible gas generated during combustion, has better flame-retardant effect, and can not damage the structure of the conductive foam.
Further, the preparation process of the flame-retardant conductive foam comprises the following steps of:
(1) Polyethylene sub-solution: adding polyethyleneimine into deionized water, adjusting the pH value to 8.5-9.5 with 1M hydrochloric acid or sodium hydroxide, and stirring for 24 hours to prepare a polyethyleneimine solution of 5-10 mg/mL;
(2) Beta-iron oxyhydroxide solution: dispersing beta-iron oxyhydroxide powder in deionized water, adjusting the pH value to 8.5-9.5 by using sodium hydroxide, and stirring for 24 hours to prepare 8-13mg/mL polyethylene sub-solution;
(3) Sodium alginate solution: dispersing sodium alginate in deionized water, stirring until the sodium alginate is dissolved, and preparing a sodium alginate solution with the concentration of 2-5 mg/mL.
Compared with the prior art, the invention has the following beneficial effects:
(1) The flame-retardant conductive foam disclosed by the invention is simple in structure, the flame retardant property of the conductive foam is improved by improving the formula of the foam and arranging the flame retardant layer between the conductive fabric and the flame-retardant foam, and the flame retardant grade of the prepared conductive foam reaches UL94-HF1;
(2) The invention discloses flame-retardant conductive foam which is prepared by compounding 107 silicon rubber serving as a raw material, hexagonal boron nitride powder and carbon nano tubes serving as heat-conducting fillers, a composite flame retardant serving as a flame retardant, methyl-terminated hydrogen-containing silicone oil, vinyl-terminated silicone oil and methyl-terminated silicone oil with vinyl-terminated side chains serving as a cross-linking agent, fumed silica, an inhibitor, an anti-aging agent and a platinum catalyst auxiliary agent, and has the advantages of quick foaming, closed-cell structure, uniform cell size and uniform distribution, wherein the flame-retardant grade reaches UL94-HF1, and the thermal conductivity is more than 0.3/W (m.K) -1 The mechanical property is excellent;
(3) According to the flame-retardant conductive foam disclosed by the invention, the conductive layer is made of the polyimide conductive fabric and the plated metal polyimide fibers, so that the flame retardant property is good, and through the orientation of the polyimide fibers and the plated metal polyimide fibers, the conductive property of the conductive fabric is ensured, the using amount of the plated metal polyimide fibers is reduced, and the cost is reduced;
(4) The preparation process of the flame-retardant conductive foam is simple, the flame-retardant layer is assembled by adopting a three-component assembly method, the process is green and environment-friendly, and by adopting the mode, the polyethylene, the beta-iron oxyhydroxide and the sodium alginate are combined together through electrostatic adsorption acting force to form a tightly-stacked net-shaped structure which can well play a barrier effect, delay the release of combustible gas generated during combustion, has a good flame-retardant effect and cannot damage the structure of the conductive foam.
Drawings
FIG. 1 is a schematic cross-sectional view of a flame retardant conductive foam of example 1 of the present invention;
FIG. 2 is a schematic cross-sectional view of a flame retardant conductive foam of embodiment 2 of the present invention;
FIG. 3 is a schematic view of a structure of a buffer column of the flame-retardant conductive foam of embodiment 2 of the present invention;
in the figure: the flame-retardant foam comprises flame-retardant foam 1, a buffer column 11, a containing hole 12, conductive cloth 2 and a flame-retardant layer 3.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to specific experimental data in fig. 1-3, examples 1-2, and example 3, and comparative examples 1-3, example 4, and example 5, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, but 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.
The following examples 1-2 provide a flame retardant conductive foam.
Example 1
As shown in fig. 1, the flame-retardant conductive foam of the present invention includes a flame-retardant foam 1 and a conductive fabric 2; the outer layer of the flame-retardant foam 1 is coated with a conductive cloth 2; and a flame-retardant layer 3 is arranged between the flame-retardant foam 1 and the conductive cloth 2.
Example 2
As shown in fig. 2 and 3, in the flame-retardant conductive foam of the present invention, a plurality of receiving holes 12 for receiving the buffer posts 11 are uniformly formed in the flame-retardant foam 1, the buffer posts 11 are disposed in the receiving holes 12, the buffer posts 11 are in a trapezoidal frustum structure, and the receiving holes 12 are in an inverted trapezoidal frustum structure. The accommodating hole 12 and the buffer column 11 are designed in a matched mode, so that the buffer damping capacity of the conductive foam can be improved, the accommodating hole 12 and the buffer column 11 are shaped, so that the mechanical operation is easy to achieve during manufacturing, and the structural stability of the conductive foam can be maintained when the conductive foam is stressed.
The following example 3 and comparative example 1 provide a foam.
Example 3
The flame-retardant foam 1 comprises the following components in parts by weight: 32 parts of 107 silicon rubber, 17 parts of hexagonal boron nitride powder, 15 parts of composite flame retardant, 9 parts of methyl terminated hydrogen-containing silicone oil, 6 parts of carbon nano tube, 4 parts of vinyl terminated silicone oil, 4 parts of methyl terminated silicone oil with vinyl on a side chain, 4 parts of fumed silica, 2 parts of inhibitor, 0.6 part of anti-aging agent and 0.8 part of platinum catalyst. The composite flame retardant comprises the following components in parts by weight: the flame retardant comprises 750 parts of flame retardant Exolit AP, 25 parts of aluminum hydroxide powder and 614 parts of flame retardant Exolit RP.
Wherein the viscosity of the 107 silicone rubber is 16000mPa & s; the molar fraction of active hydrogen of the methyl-terminated hydrogen-containing silicone oil is 1.5 percent; the viscosity of the vinyl-terminated silicone oil is 20000mPa & s, and the vinyl mole fraction is 0.8%; the viscosity of the methyl terminated silicone oil with the side chain containing vinyl is 18000mPa & s, and the vinyl mole fraction is 0.6%; the average grain diameter of the hexagonal boron nitride powder is 6 mu m; the average grain diameter of the carbon nano tube is 6nm; the fumed silica is fumed silica A380; the inhibitor is ethynyl cyclohexanol; the anti-aging agent is anti-aging agent BHT; the platinum catalyst is KE-808. The raw materials are all common raw materials in the market foam industry.
Preparing the flame-retardant foam 1: adding the 107 silicone rubber, the vinyl-terminated silicone oil and the methyl-terminated silicone oil with vinyl-terminated side chains into a stirrer together for stirring, then sequentially adding the hexagonal boron nitride powder, the composite flame retardant, the carbon nano tube, the fumed silica, the inhibitor and the anti-aging agent, continuing to stir until the mixture is uniformly mixed, then sequentially adding the methyl-terminated hydrogen-containing silicone oil and the platinum catalyst, continuing to stir until the mixture is uniformly mixed, simultaneously vacuumizing to remove air, finally coating the mixed material on the surface of a PET release film at 20 ℃, placing the PET release film in the air for 15min, and gradually foaming and molding the mixed material to obtain the flame-retardant foam 1.
Comparative example 1
Comparative example 1 is polyurethane foam DW30 from Jiangsu green resource new materials, inc.
Comparative example 2
Comparative example 2 was PE foam from plastic packaging limited, ark, su, industrial park.
Comparative example 3
Comparative example 3 is PP foam from scholar plastic packaging ltd, suzhou industrial park.
The following example 4 provides a flame retardant foam 1 with a flame retardant layer 3.
Wherein, the raw materials such as polyethyleneimine, hydrochloric acid, sodium hydroxide, beta-iron oxyhydroxide powder, sodium alginate, nitric acid and the like are all commercially available industrial common raw materials.
Example 4
The preparation of the flame-retardant foam 1 with the flame-retardant layer 3 comprises the following steps:
(1) Adding polyethylene into deionized water, adjusting the pH value to about 9 with 1M hydrochloric acid or sodium hydroxide, and stirring for 24h to obtain 8mg/mL polyethylene sub-solution; beta-iron oxyhydroxide solution: dispersing beta-iron oxyhydroxide powder in deionized water, adjusting the pH value to about 9 by using sodium hydroxide, and stirring for 24 hours to prepare 12mg/mL polyethylene sub-solution; dispersing sodium alginate in deionized water, and stirring until the sodium alginate is dissolved to prepare a 4mg/mL sodium alginate solution;
(2) Soaking the flame-retardant foam obtained in the embodiment 3 in 0.1M nitric acid solution for 5-10min, then washing with deionized water for 1-3min, and soaking the flame-retardant foam in 1% PAA solution for 2min; sequentially and alternately immersing the flame-retardant foam into a polyethylene sub-solution, a beta-iron oxyhydroxide solution and a sodium alginate solution for layer-by-layer self-assembly, wherein each immersion process lasts for 3min, then washing for 1-3min by using deionized water, and wringing to remove excessive water to obtain a layer of self-assembly, wherein the number of the self-assembly layers is 4; when the required number of layers is reached, the flame-retardant foam is placed in an oven at 650 ℃ to be dried overnight, and the flame-retardant foam 1 with the flame-retardant layer 3 is obtained.
Example 5 below provides a conductive foam.
Example 5
The conductive foam is obtained by compounding and molding the conductive fabric 1 and the flame-retardant foam 1 with the flame-retardant layer 3 in the embodiment 4. The conductive fabric 2 is a polyimide conductive fabric, and the polyimide conductive fabric is a plain weave fabric (with the area density of 180 g/m) made of polyimide fibers (50 wt%) along the radial direction of conductive foam and silver-plated polyimide fibers (50 wt%) along the circumferential direction of the cross section of the conductive foam 2 ) The thickness of the silver plating layer of the silver-plated polyimide fiber is 1.0 mu m.
Effect verification:
the foam of example 3 and comparative examples 1 to 3 was subjected to a flame retardancy UL94 foam horizontal burning test in accordance with the standard GB/T8332-2008 foam burning Performance test methods horizontal burning method, and the test results are shown in Table 1.
TABLE 1 flame retardancy test results
| Flame retardant rating | |
| Example 3 | UL94-HF1 |
| Comparative example 1 | UL94-HF2 |
| Comparative example 2 | UL94-HF2 |
| Comparative example 3 | UL94-HF2 |
From table 1, the flame retardant property of the flame retardant foam prepared by the invention is superior to that of common polyurethane foam DW30, PE foam and PP foam in the prior art.
The mechanical properties of the flame-retardant foam of example 3 and of the flame-retardant foam 1 with a flame-retardant layer 3 of example 4 were then determined according to the standard "GB/T15048-1994 rigid foam compression creep test method", the results of which are shown in Table 2.
TABLE 2 mechanical Property test results
| Compressive strength (MPa) | Modulus of elasticity (Mpa) | |
| Example 3 | 1.13 | 32.41 |
| Example 4 | 1.12 | 32.38 |
From table 2, the mechanical properties of the flame-retardant foam are not affected by the flame-retardant layer prepared by coating the flame-retardant foam on the outer surface of the flame-retardant foam layer by layer self-assembly.
Then, the thermal stability of the flame retardant foam of example 3 and the flame retardant foam 1 with flame retardant layer 3 of example 4 was examined using a TGA 5500 analyzer, which included transferring 5-8mg of sample powder into a platinum pan, testing at a heating rate of 10 ℃/min under a nitrogen stream, the test temperature rising from room temperature to 800 ℃, resulting in mass loss at 300 ℃ and 500 ℃, and the test results are shown in table 3.
TABLE 3 thermal stability test results
| Mass loss at 300 deg.C (%) | Mass loss at 500 deg.C (%) | |
| Example 3 | 24 | 50 |
| Example 4 | 20 | 48 |
As can be seen from table 3, the flame-retardant foam 1 with the flame-retardant layer 3 in example 4 has better thermal stability than the flame-retardant foam in example 3, mainly because the network structure of polyethylenesub- β -iron oxyhydroxide-sodium alginate formed on the surface of the flame-retardant foam 1 has a barrier effect on the volatile gas generated by cracking of the flame-retardant foam 1 during the anoxic thermal degradation process, thereby improving the thermal stability.
Then, the volume resistivity of the conductive foam of the example 5 is tested according to the GB/T22042-2008 garment antistatic performance surface resistivity test method, and the test result is that the volume resistivity is 38 Ω & cm, which shows that the conductive foam of the example 5 has better conductive performance.
The invention has many applications and the above description is only a preferred embodiment of the invention. It should be noted that the above examples are only for illustrating the present invention, and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications can be made without departing from the spirit of the invention, and these modifications should be construed as within the scope of the invention.
Claims (8)
1. The flame-retardant conductive foam is characterized by comprising flame-retardant foam (1) and conductive cloth (2); the outer layer of the flame-retardant foam (1) is coated with conductive cloth (2); a flame-retardant layer (3) is arranged between the flame-retardant foam (1) and the conductive cloth (2);
the flame-retardant foam (1) comprises the following components in parts by weight: 25-35 parts of 107 silicon rubber, 15-25 parts of hexagonal boron nitride powder, 15-20 parts of a composite flame retardant, 8-10 parts of methyl terminated hydrogen-containing silicone oil, 5-8 parts of carbon nano tubes, 3-5 parts of vinyl-terminated silicone oil, 3-5 parts of methyl terminated silicone oil with vinyl on a side chain, 3-5 parts of fumed silica, 1-3 parts of an inhibitor, 0.5-1 part of an anti-aging agent and 0.5-1 part of a platinum catalyst; the flame-retardant layer (3) is prepared by coating flame-retardant liquid on the outer surface of the flame-retardant foam (1) in a layer-by-layer self-assembly manner.
2. The flame-retardant conductive foam according to claim 1, wherein the composite flame retardant comprises the following components in parts by weight: 50-60 parts of flame retardant Exolit AP 750, 25-35 parts of aluminum hydroxide powder and 45-15 parts of flame retardant Exolit RP 6145.
3. The flame-retardant type conductive foam according to claim 1, wherein the conductive fabric (2) is a polyimide conductive fabric, and the polyimide conductive fabric is a plain weave fabric made of polyimide fibers in the radial direction of the conductive foam and metal-plated polyimide fibers in the circumferential direction of the cross section of the conductive foam; the metal-plated polyimide fiber is any one of polyimide fiber copper plating, nickel plating, silver plating and gold plating, and the thickness of a metal layer of the metal-plated polyimide fiber is 0.1-2.0 mu m.
4. The flame-retardant conductive foam according to claim 1, wherein the viscosity of 107 silicone rubber is 10000-20000 mPas; the molar fraction of active hydrogen of the methyl-terminated hydrogen-containing silicone oil is 0.8-1.6%; the viscosity of the vinyl-terminated silicone oil is 10000-20000 mPas, and the vinyl mole fraction is 0.5-1.0%; the viscosity of the methyl terminated silicone oil with the side chain containing vinyl is 10000-20000mPa & s, and the vinyl mole fraction is 0.3-0.8%; the average grain diameter of the hexagonal boron nitride powder is 5-10 mu m; the average grain diameter of the carbon nano tube is 5-10nm; the fumed silica is fumed silica A380; the inhibitor is ethynyl cyclohexanol; the anti-aging agent is anti-aging agent BHT; the platinum catalyst is KE-808.
5. The flame-retardant conductive foam according to claim 1, wherein a plurality of accommodating holes (12) for accommodating the buffer posts (11) are uniformly formed in the flame-retardant foam (1), and the buffer posts (11) are arranged in the accommodating holes (12).
6. The flame retardant type conductive foam according to claim 5, wherein the buffer column (11) is of a trapezoidal circular truncated cone or trapezoidal frustum structure, and the accommodating hole (12) is of an inverted trapezoidal circular truncated cone or inverted trapezoidal frustum structure.
7. The process for preparing the flame-retardant conductive foam according to any one of claims 1 to 6, which is characterized by comprising the following steps of:
(1) Preparing the flame-retardant foam: adding 107 silicon rubber, vinyl-terminated silicon oil and methyl-terminated silicon oil with vinyl-terminated side chains into a stirrer together for stirring, then sequentially adding hexagonal boron nitride powder, a composite flame retardant, a carbon nano tube, fumed silica, an inhibitor and an anti-aging agent, continuing to stir until the mixture is uniformly mixed, then sequentially adding methyl-terminated hydrogen-containing silicon oil and a platinum catalyst, continuing to stir until the mixture is uniformly mixed, simultaneously vacuumizing to remove air, finally coating the mixed material on the surface of a PET release film at 20 ℃, placing the PET release film in the air for 10-15min, and gradually foaming and molding the mixed material to obtain the flame-retardant foam;
(2) Preparation of the flame-retardant layer: soaking the flame-retardant foam in 0.1M nitric acid solution for 5-10min, washing with deionized water for 1-3min, and soaking the flame-retardant foam in 1% PAA solution for 1-3min; sequentially and alternately immersing the flame-retardant foam into a polyethylene sub-solution, a beta-iron oxyhydroxide solution and a sodium alginate solution for layer-by-layer self-assembly, wherein each immersion process lasts for 1-3min, then washing for 1-3min by using deionized water, and wringing to remove excessive water to obtain a layer of self-assembly, wherein the number of the self-assembly layers is 3-5; when the required layer number is reached, the flame-retardant foam is placed in an oven at 400-700 ℃ for drying overnight;
(3) Preparing the conductive foam: and compounding and molding the conductive cloth (1) and the flame-retardant foam (1) with the flame-retardant layer (3) to obtain the conductive foam.
8. The process for preparing the flame-retardant conductive foam according to claim 7, wherein the preparation of the flame-retardant layer (3) further comprises the following steps:
(1) Polyethylene sub-solution: adding polyethyleneimine into deionized water, adjusting the pH value to 8.5-9.5 with 1M hydrochloric acid or sodium hydroxide, and stirring for 24 hours to prepare a polyethyleneimine solution of 5-10 mg/mL;
(2) Beta-iron oxyhydroxide solution: dispersing beta-iron oxyhydroxide powder in deionized water, adjusting the pH value to 8.5-9.5 by using sodium hydroxide, and stirring for 24 hours to prepare 8-13mg/mL polyethylene sub-solution;
(3) Sodium alginate solution: dispersing sodium alginate in deionized water, stirring to dissolve, and making into 2-5mg/mL sodium alginate solution.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116390467A (en) * | 2023-05-06 | 2023-07-04 | 苏州唐东电子科技有限公司 | High-elasticity conductive foam and manufacturing process thereof |
| CN116390467B (en) * | 2023-05-06 | 2023-09-19 | 苏州唐东电子科技有限公司 | Manufacturing process of high-elasticity conductive foam |
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| CN115534456B (en) | 2024-07-05 |
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