CN220763787U - Flame-retardant polyurethane sponge antistatic structure - Google Patents
Flame-retardant polyurethane sponge antistatic structure Download PDFInfo
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- CN220763787U CN220763787U CN202322118003.2U CN202322118003U CN220763787U CN 220763787 U CN220763787 U CN 220763787U CN 202322118003 U CN202322118003 U CN 202322118003U CN 220763787 U CN220763787 U CN 220763787U
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- polyurethane sponge
- flame
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- antistatic structure
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- 239000004814 polyurethane Substances 0.000 title claims abstract description 53
- 229920002635 polyurethane Polymers 0.000 title claims abstract description 51
- 239000003063 flame retardant Substances 0.000 title claims abstract description 35
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 title claims abstract description 29
- 239000010410 layer Substances 0.000 claims abstract description 69
- 239000002344 surface layer Substances 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 14
- 239000011241 protective layer Substances 0.000 claims abstract description 13
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 13
- 230000001681 protective effect Effects 0.000 claims abstract description 7
- 229920000297 Rayon Polymers 0.000 claims description 12
- 239000000835 fiber Substances 0.000 claims description 12
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 8
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 8
- 241001330002 Bambuseae Species 0.000 claims description 8
- 229920002748 Basalt fiber Polymers 0.000 claims description 8
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 8
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 8
- 239000011425 bamboo Substances 0.000 claims description 8
- 239000004917 carbon fiber Substances 0.000 claims description 8
- 239000003365 glass fiber Substances 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- 239000003292 glue Substances 0.000 claims description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 239000012790 adhesive layer Substances 0.000 description 12
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 239000002994 raw material Substances 0.000 description 5
- 229920000742 Cotton Polymers 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 239000006260 foam Substances 0.000 description 4
- 239000002023 wood Substances 0.000 description 4
- 229920002522 Wood fibre Polymers 0.000 description 3
- 239000002025 wood fiber Substances 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- -1 polytetrafluoroethylene Polymers 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 210000002268 wool Anatomy 0.000 description 2
- 229920002955 Art silk Polymers 0.000 description 1
- 229920003043 Cellulose fiber Polymers 0.000 description 1
- 229920002488 Hemicellulose Polymers 0.000 description 1
- 229910000629 Rh alloy Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000006750 UV protection Effects 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- ZOOODBUHSVUZEM-UHFFFAOYSA-N ethoxymethanedithioic acid Chemical compound CCOC(S)=S ZOOODBUHSVUZEM-UHFFFAOYSA-N 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 229920006253 high performance fiber Polymers 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000005543 nano-size silicon particle Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- PXXKQOPKNFECSZ-UHFFFAOYSA-N platinum rhodium Chemical compound [Rh].[Pt] PXXKQOPKNFECSZ-UHFFFAOYSA-N 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004224 protection Effects 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000006277 sulfonation reaction Methods 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000002166 wet spinning Methods 0.000 description 1
- 238000005491 wire drawing Methods 0.000 description 1
- 239000012991 xanthate Substances 0.000 description 1
Abstract
The utility model relates to the technical field of polyurethane sponge, in particular to a flame-retardant polyurethane sponge antistatic structure, which comprises a polyurethane sponge body, wherein a protective material is arranged on the surface of the polyurethane sponge body and comprises a surface layer, a first bonding layer is arranged on one side of the surface layer, a wear-resistant layer is arranged on one side of the first bonding layer, a second bonding layer is arranged on one side of the wear-resistant layer, a flame-retardant layer is arranged on one side of the second bonding layer, a third bonding layer is arranged on one side of the flame-retardant layer, a reinforcing layer is arranged on one side of the third bonding layer, a fourth bonding layer is arranged on one side of the reinforcing layer, and a protective layer is arranged on one side of the fourth bonding layer. According to the polyurethane sponge, the surface layer and the wear-resistant layer are arranged, so that the polyurethane sponge has strong external bearing capacity and certain insulating property, and the polyurethane sponge has high strength and toughness and certain flame retardant property through the flame retardant layer and the reinforcing layer, and the service life of the polyurethane sponge is effectively prolonged through the protective layer.
Description
Technical Field
The utility model relates to the technical field of polyurethane sponge, in particular to a flame-retardant polyurethane sponge antistatic structure.
Background
Polyurethane, namely PU, is abbreviated as Polyurethane, chinese name Polyurethane is abbreviated as Polyurethane, polyurethane sponge is low density PU with foam density lower than 18kg/m3, the method is that the water consumption exceeds 4.5 parts, and the TDI consumption exceeds 55 parts.
The existing foam has very outstanding heat dissipation problem, and the heat inside the foam is not easy to dissipate, so that the temperature automatically rises to more than 180 ℃ in the foaming process, the foam is spontaneous combustion, and the fire hazard is caused.
Disclosure of Invention
The utility model aims to provide a flame-retardant polyurethane sponge antistatic structure for solving the problems in the background technology.
In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a fire-retardant polyurethane sponge antistatic structure, includes the polyurethane cavernosum, a plurality of filling holes have been seted up to the circumference of polyurethane cavernosum, just the inside packing of filling hole has filling material, filling material includes the surface layer, just one side of surface layer is provided with first bond line, first bond line one side is provided with the wearing layer, just one side of wearing layer is provided with the second bond line, the second one side fire-retardant layer of bond line, just one side of fire-retardant layer is provided with the third the bond line, the third one side of bond line is provided with the enhancement layer, one side of enhancement layer is provided with the fourth the bond line, and fourth one side of bond line is provided with the protective layer.
Preferably, the surface layer is made of viscose fibers, the wear-resistant layer is made of glass fibers, and the flame-retardant layer is made of basalt fibers.
Preferably, the reinforcing layer is made of carbon fibers, the protective layer is made of bamboo fibers, and the adhesive layer is nano-silica waterproof glue.
Preferably, the polyurethane sponge body comprises a lower frame and an upper frame, and connecting pins are arranged at the corners of the upper side of the lower frame and the corners of the lower side of the upper frame.
Preferably, the circumference of the connecting pin is sleeved with a hollow pipe, and the upper frame and the lower frame are connected through the hollow pipe.
Preferably, the inner corners of the upper frame and the lower frame are respectively provided with a triangular limiting plate.
Preferably, a chute is arranged on the side wall of the hollow tube, and a baffle is slidably arranged in the inner cavity of the chute.
Preferably, the baffle is slidably connected with the hollow tube, and a plurality of vent holes are formed in the side wall of the baffle.
Compared with the prior art, the utility model has the beneficial effects that:
according to the utility model, the polyurethane sponge body has certain insulating property through the surface layer, the appearance bearing capacity of the polyurethane sponge body is improved through the wear-resistant layer, the polyurethane sponge body has certain flame retardant property through the flame retardant layer, the strength and toughness of the polyurethane sponge body are effectively improved through the reinforcing layer, the service life of the polyurethane sponge body is effectively prolonged through the protective layer, and the connection strength among the surface layer, the wear-resistant layer, the flame retardant layer, the reinforcing layer and the protective layer is effectively enhanced through the adhesive layer.
Drawings
FIG. 1 is a schematic diagram of one side of the overall structure of the present utility model;
FIG. 2 is a schematic view of a lower bracket in the overall structure of the present utility model;
FIG. 3 is a schematic view of an upper bracket in the overall structure of the present utility model;
fig. 4 is a layered schematic view of the protective material in the overall structure of the present utility model.
In the figure: 1. polyurethane sponge; 101. a lower frame; 102. an upper frame; 103. a connecting pin; 201. a surface layer; 202. a wear-resistant layer; 203. a flame retardant layer; 204. a reinforcing layer; 205. a protective layer; 206. an adhesive layer; 3. a hollow tube; 4. a limiting plate; 5. and a baffle.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Examples
Referring to fig. 1-4, there is shown: the embodiment is a preferred implementation manner in the present technical solution, and the anti-static structure of the flame retardant polyurethane sponge includes a polyurethane sponge body 1, a protective material is disposed on the surface of the polyurethane sponge body 1, the protective material includes a surface layer 201, a first adhesive layer 206 is disposed on one side of the surface layer 201, a wear-resistant layer 202 is disposed on one side of the first adhesive layer 206, a second adhesive layer 206 is disposed on one side of the wear-resistant layer 202, a flame retardant layer 203 is disposed on one side of the second adhesive layer 206, a third adhesive layer 206 is disposed on one side of the flame retardant layer 203, a reinforcing layer 204 is disposed on one side of the third adhesive layer 206, a fourth adhesive layer 206 is disposed on one side of the reinforcing layer 204, and a protective layer 205 is disposed on one side of the fourth adhesive layer 206;
it should be noted that, this application is through setting up surface layer 201 for polyurethane cavernosum 1 has certain insulating properties, through wearing layer 202, make the outward appearance bearing capacity of polyurethane cavernosum 1 improved, through fire-retardant layer 203, make polyurethane cavernosum 1 have certain fire-retardant properties, through enhancement layer 204, make effectual intensity and the toughness of improving polyurethane cavernosum 1, through protective layer 205, make the effectual life who improves polyurethane cavernosum 1, through adhesive layer 206, make the effectual joint strength of having strengthened between surface layer 201, wearing layer 202, fire-retardant layer 203, enhancement layer 204 and the protective layer 205.
As shown in fig. 2-3, the polyurethane sponge 1 comprises a lower frame 101 and an upper frame 102, wherein connecting pins 103 are arranged at the corners of the upper side of the lower frame 101 and the corners of the lower side of the upper frame 102, a hollow pipe 3 is sleeved on the periphery of the connecting pins 103, the upper frame 102 is connected with the lower frame 101 through the hollow pipe 3, triangular limiting plates 4 are arranged at the corners of the inner sides of the upper frame 102 and the lower frame 101, sliding grooves are formed in the side walls of the hollow pipe 3, a baffle 5 is slidably arranged in an inner cavity of each sliding groove, the baffle 5 is slidably connected with the hollow pipe 3, and a plurality of ventilation holes are formed in the side walls of the baffle 5;
when the device is used, the lower frame 101 is preferably placed on the ground, then one end of the hollow tube 3 is aligned with the connecting pin 103 arranged at the corner of the upper side of the lower frame 101, the hollow tube 3 is spliced with the connecting pin 103 after alignment, the hollow tube 3 is installed, the baffle 5 is aligned with the sliding groove on the side wall of the hollow tube 3, the baffle 5 is put down after alignment, then the connecting pin 103 at the corner of the lower side of the upper frame 102 is spliced with the other end of the hollow tube 3, the limiting plate 4 at the inner side of the upper frame 102 and the lower frame 101 is used for limiting the position of an object, the baffle 5 is used for protecting the object, and the vent hole formed on the baffle 5 is used for ventilating the interior of the polyurethane sponge 1.
As shown in fig. 4, the surface layer 201 is made of viscose fiber, the wear-resistant layer 202 is made of glass fiber, the flame-retardant layer 203 is made of basalt fiber, the reinforcing layer 204 is made of carbon fiber, the protective layer 205 is made of bamboo fiber, and the bonding layer 206 comprises nano-silica waterproof glue;
the viscose belongs to cellulose fiber, which is prepared by taking natural fiber as raw material, preparing soluble cellulose xanthate through the procedures of alkalization, aging, sulfonation and the like, then dissolving in dilute alkali solution to prepare viscose, preparing the viscose through wet spinning, adopting different raw materials and spinning processes, respectively obtaining common viscose, high wet modulus viscose, high strength viscose and the like, wherein the common viscose has common physical and mechanical properties and chemical properties, and is divided into cotton, wool and filament type, commonly called artificial cotton, artificial wool and artificial silk, the hygroscopicity of the viscose accords with the physiological requirement of human skin, and the viscose has the characteristics of smoothness, coolness, ventilation, static resistance, ultraviolet resistance, gorgeous color, better dyeing fastness and the like, and has the characteristics of cotton nature, silk quality, being a plant fiber of a tunnel, and being superior to natural source;
glass fiber is an inorganic nonmetallic material with excellent performance, and has the advantages of good insulativity, strong heat resistance, good corrosion resistance and high mechanical strength, and is generally used as a reinforcing material in a composite material, an electric insulating material and a heat insulating material, and the glass fiber can be divided into continuous fiber, fixed-length fiber and glass cotton according to the shape and the length;
the basalt fiber is a continuous fiber which is prepared by drawing natural basalt, wherein the basalt stone is melted at 1450-1500 ℃, and then is drawn at high speed through a platinum-rhodium alloy wire-drawing bushing, the color of the pure natural basalt fiber is generally brown, and the basalt fiber is a novel inorganic environment-friendly green high-performance fiber material which is composed of oxides such as silicon dioxide, aluminum oxide, calcium oxide, magnesium oxide, ferric oxide, titanium dioxide and the like. The basalt continuous fiber has high strength and various excellent performances such as electric insulation, corrosion resistance, high temperature resistance and the like. In addition, the production process of basalt fiber determines that the produced waste is less, the environmental pollution is small, and the product can be directly degraded in the environment after being abandoned without any harm, so the basalt fiber is a real environment-friendly and environment-friendly material;
the main component of the carbon fiber is polytetrafluoroethylene, and the polytetrafluoroethylene has good chemical stability, so that the carbon fiber has certain corrosion resistance, the carbon fiber has smooth and defect-free surface, and the isotropy is very uniform, so that the carbon fiber still has good dielectric property and good magnetic permeability under high frequency, and the carbon fiber has insulating property;
the bamboo-wood fiber is a novel environment-friendly building material made of bamboo and wood, and is made of bamboo and wood, the fiber-finely-divided bamboo-wood fiber board has the advantages of good board environment-friendly performance, fireproof performance, material water resistance, corrosion resistance and the like, the raw material technology is widely applied to the fields of building, material furniture, decoration and the like, the fiber-finely-divided raw material of the bamboo-wood fiber is mainly bamboo and wood, the bamboo is a raw material plant which grows fast, light in weight and high in material hardness, and is known as green steel, and the bamboo-wood made of material bamboo is mainly cellulose, hemicellulose, lignin and the like;
the nano silicon waterproof adhesive can not reduce the activity of the waterproof adhesive surface due to external friction. Because it has good wear resistance, can prevent mild friction in daily life, comprehensive face of gluing protects, guarantees its life-span and protective effect.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present utility model, and the present utility model is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present utility model has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (8)
1. An anti-static structure of flame-retardant polyurethane sponge comprises a polyurethane sponge body (1); the method is characterized in that: the polyurethane sponge comprises a polyurethane sponge body (1), wherein a protective material is arranged on the surface of the polyurethane sponge body (1), the protective material comprises a surface layer (201), a first bonding layer (206) is arranged on one side of the surface layer (201), a wear-resistant layer (202) is arranged on one side of the bonding layer (206), a second bonding layer (206) is arranged on one side of the wear-resistant layer (202), a flame-retardant layer (203) is arranged on one side of the bonding layer (206), a third bonding layer (206) is arranged on one side of the flame-retardant layer (203), a reinforcing layer (204) is arranged on one side of the bonding layer (206), a fourth bonding layer (206) is arranged on one side of the reinforcing layer (204), and a protective layer (205) is arranged on one side of the bonding layer (206).
2. The flame retardant polyurethane sponge antistatic structure of claim 1, wherein: the surface layer (201) is made of viscose fiber, the wear-resistant layer (202) is made of glass fiber, and the flame-retardant layer (203) is made of basalt fiber.
3. The flame retardant polyurethane sponge antistatic structure of claim 1, wherein: the reinforcing layer (204) is made of carbon fibers, the protective layer (205) is made of bamboo fibers, and the bonding layer (206) is nano-silica waterproof glue.
4. The flame retardant polyurethane sponge antistatic structure of claim 1, wherein: the polyurethane sponge body (1) comprises a lower frame (101) and an upper frame (102), and connecting pins (103) are arranged at the corners of the upper side of the lower frame (101) and the corners of the lower side of the upper frame (102).
5. The flame retardant polyurethane sponge antistatic structure of claim 4, wherein: the circumference of the connecting pin (103) is sleeved with a hollow tube (3), and the upper frame (102) and the lower frame (101) are connected through the hollow tube (3).
6. The flame retardant polyurethane sponge antistatic structure of claim 4, wherein: and triangular limiting plates (4) are arranged at the inner corners of the upper frame (102) and the lower frame (101).
7. The flame retardant polyurethane sponge antistatic structure of claim 5, wherein: a sliding groove is formed in the side wall of the hollow tube (3), and a baffle (5) is slidably arranged in the inner cavity of the sliding groove.
8. The flame retardant polyurethane sponge antistatic structure of claim 7, wherein: the baffle (5) is in sliding connection with the hollow pipe (3), and a plurality of vent holes are formed in the side wall of the baffle (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322118003.2U CN220763787U (en) | 2023-08-08 | 2023-08-08 | Flame-retardant polyurethane sponge antistatic structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322118003.2U CN220763787U (en) | 2023-08-08 | 2023-08-08 | Flame-retardant polyurethane sponge antistatic structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220763787U true CN220763787U (en) | 2024-04-12 |
Family
ID=90617812
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322118003.2U Active CN220763787U (en) | 2023-08-08 | 2023-08-08 | Flame-retardant polyurethane sponge antistatic structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220763787U (en) |
-
2023
- 2023-08-08 CN CN202322118003.2U patent/CN220763787U/en active Active
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