CN218399740U - Waterproof roll with high ultraviolet resistance - Google Patents
Waterproof roll with high ultraviolet resistance Download PDFInfo
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- CN218399740U CN218399740U CN202221359886.5U CN202221359886U CN218399740U CN 218399740 U CN218399740 U CN 218399740U CN 202221359886 U CN202221359886 U CN 202221359886U CN 218399740 U CN218399740 U CN 218399740U
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Abstract
The utility model relates to a waterproofing membrane that ultraviolet resistance performance is high. The waterproof roll with high ultraviolet resistance sequentially comprises a first ultraviolet-resistant high-molecular sheet layer, a polyester mesh fabric layer, a titanium alloy film layer and a second ultraviolet-resistant high-molecular sheet layer from top to bottom. This waterproofing membrane's first anti ultraviolet macromolecular sheet layer and second anti ultraviolet macromolecular sheet layer are upper and lower superficial layer, the absorption ultraviolet light that its anti ultraviolet auxiliary agent that contains can be fine, prevent that ultraviolet ray from destroying waterproofing membrane's macromolecular material, on this basis, still compound titanium alloy rete between first anti ultraviolet macromolecular sheet layer and second anti ultraviolet macromolecular sheet layer, after the ultraviolet that is not absorbed by anti ultraviolet auxiliary agent enters into the inlayer, titanium alloy rete absorbs incident ultraviolet ray promptly, thereby the realization is to the better absorption effect of ultraviolet ray, further prevent that ultraviolet ray from destroying waterproofing membrane's macromolecular material, make this waterproofing membrane's ultraviolet resistance ability very excellent.
Description
Technical Field
The utility model relates to a waterproofing membrane field, more specifically relates to a waterproofing membrane that ultraviolet resistance performance is high.
Background
The waterproof roll is mainly used for roofs, building walls, tunnels, highways and other places, can be curled into a roll-shaped flexible building material product for resisting external rainwater and underground water leakage, is used as a leakage-free connection between an engineering foundation and a building, is a first barrier for water prevention of the whole engineering, and plays a vital role in the whole engineering.
At present, the common modified asphalt waterproof coiled material coating material on the market adopts common modified petroleum asphalt, the ultraviolet resistance of the modified asphalt without special treatment is poor, the ultraviolet resistance of a surface film is not special treatment, and the waterproof coiled material made of the modified asphalt waterproof coiled material cannot be used for waterproofing of special building parts, such as exposed roofs, because the ultraviolet resistance of the waterproof coiled material is poor. A traditional chinese patent named a composite waterproof special high polymer asphalt waterproof roll provides a waterproof roll, which improves the weather resistance, such as ultraviolet resistance, of the waterproof roll by providing a weather-resistant facing waterproof layer made of neoprene, but the ultraviolet resistance of the waterproof roll is still limited and needs to be further improved.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a first purpose is to overcome the not high problem of above-mentioned current waterproofing membrane ultraviolet resistance performance, provides a waterproofing membrane that ultraviolet resistance performance is high. This waterproofing membrane's first anti ultraviolet macromolecular sheet layer and second anti ultraviolet macromolecular sheet layer are upper and lower superficial layer, the absorption ultraviolet ray that its anti ultraviolet auxiliary agent that contains can be fine, prevent that ultraviolet ray from destroying waterproofing membrane's macromolecular material, on this basis, still compound titanium alloy rete between first anti ultraviolet macromolecular sheet layer and second anti ultraviolet macromolecular sheet layer, after the ultraviolet that is not absorbed by anti ultraviolet auxiliary agent enters into the inlayer, titanium alloy rete absorbs incident ultraviolet ray promptly, thereby the realization is to the better absorption effect of ultraviolet ray, further prevent that ultraviolet ray from destroying waterproofing membrane's macromolecular material, make this waterproofing membrane's ultraviolet resistance ability very excellent, make waterproofing membrane's weatherability good, long service life. In addition, still compounded the dacron check cloth layer between the waterproofing membrane, this not only makes waterproofing membrane have good root resistance puncture performance, makes the macromolecular sheet layer difficult for splitting under the condition of volume change (for example when expend with heat and contract with cold) moreover, and life is longer.
The above object of the utility model is realized through following technical scheme:
a waterproof coiled material with high ultraviolet resistance sequentially comprises a first ultraviolet-resistant high polymer sheet layer, a terylene gridding cloth layer, a titanium alloy film layer and a second ultraviolet-resistant high polymer sheet layer from top to bottom.
When in use, the waterproof coiled material is paved on a paved base surface by hot air welding or mechanical fixing to form continuous mechanical bonding and is permanently sealed on the base surface.
The utility model discloses a waterproofing membrane's first anti ultraviolet macromolecular sheet layer and second anti ultraviolet macromolecular sheet layer are upper and lower superficial layer, the absorption ultraviolet ray that its anti ultraviolet auxiliary agent that contains can be fine, prevent that ultraviolet from destroying waterproofing membrane's macromolecular material, on this basis, titanium alloy rete has still been compound between first anti ultraviolet macromolecular sheet layer and second anti ultraviolet macromolecular sheet layer, after the inlayer is entered into to by the ultraviolet absorption of anti ultraviolet auxiliary agent, titanium alloy rete absorbs incident ultraviolet ray promptly, thereby realize the better absorption effect to the ultraviolet ray, further prevent that ultraviolet from destroying waterproofing membrane's macromolecular material, make this waterproofing membrane's ultraviolet resistance can be very excellent, make waterproofing membrane's weatherability good, long service life. In addition, still compound dacron net cloth layer between the waterproofing membrane, it plays the reinforcing effect, and this not only makes waterproofing membrane have good root resistance puncture performance, makes the macromolecular sheet layer difficult for splitting under the condition of volume change (for example when expending with heat and contract with cold) moreover, and life is longer.
The first uvioresistant polymer sheet layer may be made of polymer material, and may have proper polymer material, such as thermoplastic polyolefin elastomer, as required.
Preferably, the first ultraviolet resistant polymer sheet layer is an ultraviolet resistant thermoplastic polyolefin elastomer (TPO) layer.
The dosage of the high polymer material and the ultraviolet-resistant auxiliary agent of the first ultraviolet-resistant high polymer sheet layer is conventional dosage.
Preferably, the first ultraviolet-resistant polymer sheet layer comprises 100 parts of a polymer material and 1-3 parts of an ultraviolet-resistant auxiliary agent.
More preferably, the ultraviolet-resistant auxiliary agent is UV-9.
The first uvioresistant polymer sheet layer may also contain other assistant, for example, toughening agent in 1-3 weight portions.
Preferably, the thickness of the first polymer sheet layer is 0.5 to 1.0mm.
Preferably, the thickness of the terylene gridding cloth layer is 0.1 to 0.3mm.
Preferably, the polyester mesh fabric layer comprises 1-2 layers of polyester mesh fabric.
Preferably, the area of the single mesh of the polyester mesh fabric layer is 4 to 8mm 2 。
Preferably, the shape of the meshes of the polyester mesh fabric layer is square, rectangular or rhombic.
Preferably, the thickness of the titanium alloy film layer is 0.1-0.3 mm.
The titanium alloy film layer may be made of a titanium alloy material that is conventional in the art.
Preferably, the titanium alloy film layer is made of a nano titanium alloy material.
The second anti-ultraviolet polymer sheet layer can be made of polymer materials conventional in the art, and can also be made of suitable polymer materials according to performance requirements, such as thermoplastic polyolefin elastomer materials.
Preferably, the second ultraviolet resistant polymer sheet layer is an ultraviolet resistant thermoplastic polyolefin elastomer (TPO) layer.
The dosage of the high polymer material and the anti-ultraviolet auxiliary agent of the second anti-ultraviolet high polymer sheet layer is conventional dosage.
Preferably, the second anti-ultraviolet polymer sheet layer comprises 100 parts of a polymer material and 1-3 parts of an anti-ultraviolet auxiliary agent.
More preferably, the anti-ultraviolet auxiliary agent is UV-9.
The second uv resistant polymer sheet layer may also contain other auxiliaries, for example, a toughening agent.
Preferably, the thickness of the second anti-ultraviolet polymer sheet layer is 0.5-1.0 mm.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses a waterproofing membrane's first anti ultraviolet macromolecular sheet layer and second anti ultraviolet macromolecular sheet layer are upper and lower superficial layer, the absorption ultraviolet ray that its anti ultraviolet auxiliary agent that contains can be fine, prevent that ultraviolet pair waterproofing membrane's macromolecular material from destroying, on this basis, titanium alloy rete has still been compound between first anti ultraviolet macromolecular sheet layer and second anti ultraviolet macromolecular sheet layer, after not being entered into the ultraviolet inlayer by the ultraviolet of anti ultraviolet auxiliary agent absorptive ultraviolet, titanium alloy rete absorbs incident ultraviolet ray promptly, thereby realize the better absorption effect to the ultraviolet ray, further prevent that ultraviolet pair waterproofing membrane's macromolecular material from destroying, make this waterproofing membrane's durability very excellent, make waterproofing membrane's weatherability good, long service life. In addition, still compound dacron net cloth layer between the waterproofing membrane, it plays the reinforcing effect, and this not only makes waterproofing membrane have good root resistance puncture performance, makes the macromolecular sheet layer difficult for splitting under the condition of volume change (for example when expending with heat and contract with cold) moreover, and life is longer.
Drawings
Fig. 1 is a schematic sectional structure view of a waterproofing membrane according to example 1.
Fig. 2 is a schematic view of a partial structure of the polyester scrim layer of the waterproof roll of example 1.
Fig. 3 is a schematic view showing a rolled state of the waterproofing membrane of embodiment 1.
In the figure, 1 is a first uvioresistant polymer sheet layer, 2 is a terylene gridding cloth layer, 3 is a titanium alloy film layer, and 4 is a second uvioresistant polymer sheet layer.
Detailed Description
For a clearer and more complete description of the technical solutions of the present invention, the present invention will be described in further detail below with reference to specific embodiments, it being understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention, and that various changes can be made within the scope defined by the claims of the present invention.
Example 1
This embodiment provides a waterproofing membrane that ultraviolet resistance is high, and fig. 1 is the cross-sectional structure of this waterproofing membrane schematic diagram, as shown in fig. 1, this waterproofing membrane includes first anti ultraviolet macromolecular sheet layer 1, dacron net cloth layer 2, titanium alloy membranous layer 3 and second anti ultraviolet macromolecular sheet layer 4 from top to bottom in proper order. The first high polymer sheet layer 1 is an anti-ultraviolet thermoplastic polyolefin elastomer (TPO) layer, the thickness of the first high polymer sheet layer is 0.8mm, and the selected anti-ultraviolet auxiliary agent is UV-9. The terylene mesh cloth layer 2 comprises 1 terylene mesh cloth layer, the thickness of the terylene mesh cloth layer 2 is 0.2mm, figure 2 is a partial structure schematic diagram of the terylene mesh cloth layer, as shown in figure 2, the shape of meshes is positiveSquare, 6mm mesh area 2 . The thickness of the titanium alloy film layer 3 is 0.2mm, and the titanium alloy film layer is made of a nano titanium alloy material. The second high polymer sheet layer 4 is an anti-ultraviolet thermoplastic polyolefin elastomer (TPO) layer, the thickness of the TPO layer is 0.8mm, and the selected anti-ultraviolet auxiliary agent is UV-9. The rolled-up state of the waterproofing membrane is shown in fig. 3.
The preparation method of the waterproof roll comprises the following steps: 100 parts of thermoplastic polyolefin elastomer particles and 2 parts of anti-ultraviolet auxiliary agent are mixed to obtain a mixture for later use. And mechanically pressing the polyester mesh fabric layer and the titanium alloy film layer to obtain a composite layer for later use. And (3) compounding the mixture on the upper surface and the lower surface of the composite layer through extrusion molding of a screw extruder to prepare the waterproof roll with high ultraviolet resistance.
The shape of the mesh may be adjusted according to actual requirements and processing difficulty, and may be, for example, a rectangle or a rhombus.
When in use, the waterproof coiled material is paved on a paved base surface by adopting hot air welding or mechanical fixation to form continuous mechanical bonding and is sealed on the base surface.
This waterproofing membrane's first anti ultraviolet macromolecular sheet layer and second anti ultraviolet macromolecular sheet layer are upper and lower superficial layer, the absorption ultraviolet ray that its anti ultraviolet auxiliary agent that contains can be fine, prevent that ultraviolet ray from destroying waterproofing membrane's macromolecular material, on this basis, still compound titanium alloy rete between first anti ultraviolet macromolecular sheet layer and second anti ultraviolet macromolecular sheet layer, after the ultraviolet that is not absorbed by anti ultraviolet auxiliary agent enters into the inlayer, titanium alloy rete absorbs incident ultraviolet ray promptly, thereby the realization is to the better absorption effect of ultraviolet ray, further prevent that ultraviolet ray from destroying waterproofing membrane's macromolecular material, make this waterproofing membrane's ultraviolet resistance ability very excellent, make waterproofing membrane's weatherability good, long service life. In addition, still compound dacron net cloth layer between the waterproofing membrane, it plays the reinforcing effect, and this not only makes waterproofing membrane have good root resistance puncture performance, makes the macromolecular sheet layer difficult for splitting under the condition of volume change (for example when expending with heat and contract with cold) moreover, and life is longer.
Example 2
The embodiment provides a waterproofing membrane that ultraviolet resistance is high, and this waterproofing membrane includes first anti ultraviolet macromolecular sheet layer 1, dacron net cloth layer 2, titanium alloy membranous layer 3 and second anti ultraviolet macromolecular sheet layer 4 from top to bottom in proper order. The first high polymer sheet layer 1 is an anti-ultraviolet thermoplastic polyolefin elastomer (TPO) layer, the thickness of the first high polymer sheet layer is 0.5mm, and the selected anti-ultraviolet auxiliary agent is UV-9. The terylene gridding cloth layer 2 comprises 1 terylene gridding cloth layer, the thickness of the terylene gridding cloth layer 2 is 0.1mm, the shape of the mesh is square, and the area of the mesh is 4mm 2 . The thickness of the titanium alloy film layer 3 is 0.1mm, and the titanium alloy film layer is made of a nano titanium alloy material. The second high polymer sheet layer 4 is an anti-ultraviolet thermoplastic polyolefin elastomer (TPO) layer, the thickness of the TPO layer is 0.5mm, and the selected anti-ultraviolet auxiliary agent is UV-9.
The preparation method of the waterproof roll comprises the following steps: and mixing 100 parts of thermoplastic polyolefin elastomer particles and 2 parts of ultraviolet-resistant auxiliary agent to obtain a mixture for later use. And mechanically pressing the polyester mesh fabric layer and the titanium alloy film layer to obtain a composite layer for later use. And (3) compounding the mixture on the upper surface and the lower surface of the composite layer through extrusion molding of a screw extruder to prepare the waterproof roll with high ultraviolet resistance.
When in use, the waterproof coiled material is paved on a paved base surface by adopting hot air welding or mechanical fixation to form continuous mechanical bonding and is sealed on the base surface.
This waterproofing membrane's first anti ultraviolet macromolecular sheet layer and second anti ultraviolet macromolecular sheet layer are upper and lower superficial layer, the absorption ultraviolet ray that its anti ultraviolet auxiliary agent that contains can be fine, prevent that ultraviolet ray from destroying waterproofing membrane's macromolecular material, on this basis, still compound titanium alloy rete between first anti ultraviolet macromolecular sheet layer and second anti ultraviolet macromolecular sheet layer, after the ultraviolet that is not absorbed by anti ultraviolet auxiliary agent enters into the inlayer, titanium alloy rete absorbs incident ultraviolet ray promptly, thereby the realization is to the better absorption effect of ultraviolet ray, further prevent that ultraviolet ray from destroying waterproofing membrane's macromolecular material, make this waterproofing membrane's ultraviolet resistance ability very excellent, make waterproofing membrane's weatherability good, long service life. In addition, still compound dacron net cloth layer between the waterproofing membrane, it plays the reinforcing effect, and this not only makes waterproofing membrane have good root resistance puncture performance, makes the macromolecular sheet layer difficult for splitting under the condition of volume change (for example when expending with heat and contract with cold) moreover, and life is longer.
Example 3
The embodiment provides a waterproofing membrane that resistant ultraviolet performance is high, and this waterproofing membrane from the top down includes first anti ultraviolet macromolecular sheet layer 1, dacron net cloth layer 2, titanium alloy membranous layer 3 and second anti ultraviolet macromolecular sheet layer 4 in proper order. The first high polymer sheet layer 1 is an anti-ultraviolet thermoplastic polyolefin elastomer (TPO) layer, the thickness of the first high polymer sheet layer is 1.0mm, and the selected anti-ultraviolet auxiliary agent is UV-9. The terylene gridding cloth layer 2 comprises 2 terylene gridding cloth layers, the thickness of the terylene gridding cloth layer 2 is 0.3mm, the shape of the mesh is square, and the area of the mesh is 8mm 2 . The thickness of the titanium alloy film layer 3 is 0.3mm, and the titanium alloy film layer is made of a nano titanium alloy material. The second high polymer sheet layer 4 is an anti-ultraviolet thermoplastic polyolefin elastomer (TPO) layer, the thickness of the TPO layer is 1.0mm, and the selected anti-ultraviolet auxiliary agent is UV-9.
The preparation method of the waterproof roll comprises the following steps: 100 parts of thermoplastic polyolefin elastomer particles and 2 parts of anti-ultraviolet auxiliary agent are mixed to obtain a mixture for later use. And mechanically laminating the polyester mesh fabric layer and the titanium alloy film layer to obtain a composite layer for later use. And compounding the mixture on the upper surface and the lower surface of the composite layer by extrusion molding of a screw extruder to prepare the waterproof roll with high ultraviolet resistance.
When in use, the waterproof coiled material is paved on a paved base surface by adopting hot air welding or mechanical fixation to form continuous mechanical bonding and is sealed on the base surface.
This waterproofing membrane's first anti ultraviolet macromolecular sheet layer and second anti ultraviolet macromolecular sheet layer are upper and lower superficial layer, the absorption ultraviolet ray that its anti ultraviolet auxiliary agent that contains can be fine, prevent that ultraviolet ray from destroying waterproofing membrane's macromolecular material, on this basis, still compound titanium alloy rete between first anti ultraviolet macromolecular sheet layer and second anti ultraviolet macromolecular sheet layer, after the ultraviolet that is not absorbed by anti ultraviolet auxiliary agent enters into the inlayer, titanium alloy rete absorbs incident ultraviolet ray promptly, thereby the realization is to the better absorption effect of ultraviolet ray, further prevent that ultraviolet ray from destroying waterproofing membrane's macromolecular material, make this waterproofing membrane's ultraviolet resistance ability very excellent, make waterproofing membrane's weatherability good, long service life. In addition, still compound dacron net cloth layer between the waterproofing membrane, it plays the reinforcing effect, and this not only makes waterproofing membrane have good root resistance puncture performance, makes the macromolecular sheet layer difficult for splitting under the condition of volume change (for example when expending with heat and contract with cold) moreover, and life is longer.
Example 4
The embodiment provides a waterproof roll with high ultraviolet resistance, and the waterproof roll sequentially comprises a first ultraviolet-resistant high polymer sheet layer 1, a terylene gridding cloth layer 2, a titanium alloy film layer 3 and a second ultraviolet-resistant high polymer sheet layer 4 from top to bottom. The first high polymer sheet layer 1 is an anti-ultraviolet thermoplastic polyolefin elastomer (TPO) layer, the thickness of the first high polymer sheet layer is 0.8mm, and the selected anti-ultraviolet auxiliary agent is UV-9. The terylene gridding cloth layer 2 comprises 1 terylene gridding cloth layer, the thickness of the terylene gridding cloth layer 2 is 0.2mm, the shape of the meshes is square, and the area of the meshes is 6mm 2 . The thickness of the titanium alloy film layer 3 is 0.2mm, and the titanium alloy film layer is made of a nano titanium alloy material. The second high polymer sheet layer 4 is an anti-ultraviolet thermoplastic polyolefin elastomer (TPO) layer, the thickness of the TPO layer is 0.8mm, and the selected anti-ultraviolet auxiliary agent is UV-9.
The preparation method of the waterproof roll comprises the following steps: mixing 100 parts of thermoplastic polyolefin elastomer particles, 2 parts of ultraviolet-resistant auxiliary agent and 2 parts of toughening agent to obtain a mixture for later use. And mechanically laminating the polyester mesh fabric layer and the titanium alloy film layer to obtain a composite layer for later use. And (3) compounding the mixture on the upper surface and the lower surface of the composite layer through extrusion molding of a screw extruder to prepare the waterproof roll with high ultraviolet resistance.
When in use, the waterproof coiled material is paved on a paved base surface by adopting hot air welding or mechanical fixation to form continuous mechanical bonding and is sealed on the base surface.
This waterproofing membrane's first anti ultraviolet macromolecular sheet layer and second anti ultraviolet macromolecular sheet layer are upper and lower superficial layer, the absorption ultraviolet ray that its anti ultraviolet auxiliary agent that contains can be fine, prevent that ultraviolet ray from destroying waterproofing membrane's macromolecular material, on this basis, still compound titanium alloy rete between first anti ultraviolet macromolecular sheet layer and second anti ultraviolet macromolecular sheet layer, after the ultraviolet that is not absorbed by anti ultraviolet auxiliary agent enters into the inlayer, titanium alloy rete absorbs incident ultraviolet ray promptly, thereby the realization is to the better absorption effect of ultraviolet ray, further prevent that ultraviolet ray from destroying waterproofing membrane's macromolecular material, make this waterproofing membrane's ultraviolet resistance ability very excellent, make waterproofing membrane's weatherability good, long service life. In addition, still compounded the dacron check cloth layer between the waterproofing membrane, it plays the reinforcing effect, and this not only makes waterproofing membrane have good root resistance puncture performance, makes the macromolecular sheet layer difficult for splitting under the condition of volume change (for example when expend with heat and contract with cold) moreover, and life is longer.
It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations to the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (8)
1. The waterproof roll with high ultraviolet resistance is characterized by sequentially comprising a first ultraviolet-resistant high polymer sheet layer (1), a polyester mesh fabric layer (2), a titanium alloy film layer (3) and a second ultraviolet-resistant high polymer sheet layer (4) from top to bottom;
the first ultraviolet-resistant high polymer sheet layer (1) is an ultraviolet-resistant thermoplastic polyolefin elastomer layer;
the second anti-ultraviolet high polymer sheet layer (4) is an anti-ultraviolet thermoplastic polyolefin elastomer layer.
2. The waterproofing membrane according to claim 1, wherein the thickness of the first ultraviolet-resistant polymer sheet layer (1) is 0.5 to 1.0mm.
3. A water-proof coiled material according to claim 1, wherein the thickness of the terylene gridding cloth layer (2) is 0.1 to 0.3mm.
4. The waterproof roll according to claim 1, wherein the terylene gridding cloth layer (2) comprises 1-2 layers of terylene gridding cloth.
5. A waterproofing membrane according to claim 1, wherein the area of the single mesh of the terylene mesh fabric layer (2) is 4-8 mm 2 。
6. A sheet of waterproofing membrane according to claim 1, wherein the shape of the meshes of the polyester mesh layer (2) is square, rectangular or rhombic.
7. The waterproofing membrane according to claim 1, wherein the thickness of the titanium alloy film layer (3) is 0.1 to 0.3mm.
8. The waterproofing membrane according to claim 1, wherein the thickness of the second ultraviolet resistant polymer sheet layer (4) is 0.5 to 1.0mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221359886.5U CN218399740U (en) | 2022-05-31 | 2022-05-31 | Waterproof roll with high ultraviolet resistance |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221359886.5U CN218399740U (en) | 2022-05-31 | 2022-05-31 | Waterproof roll with high ultraviolet resistance |
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| Publication Number | Publication Date |
|---|---|
| CN218399740U true CN218399740U (en) | 2023-01-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221359886.5U Active CN218399740U (en) | 2022-05-31 | 2022-05-31 | Waterproof roll with high ultraviolet resistance |
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- 2022-05-31 CN CN202221359886.5U patent/CN218399740U/en active Active
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