CN108897109A - Low-smoke non-halogen flame-retardant air-blowing micro-pipe - Google Patents
Low-smoke non-halogen flame-retardant air-blowing micro-pipe Download PDFInfo
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- CN108897109A CN108897109A CN201810803178.8A CN201810803178A CN108897109A CN 108897109 A CN108897109 A CN 108897109A CN 201810803178 A CN201810803178 A CN 201810803178A CN 108897109 A CN108897109 A CN 108897109A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/443—Protective covering
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0066—Use of inorganic compounding ingredients
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
- C08J9/08—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing carbon dioxide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/4436—Heat resistant
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/02—CO2-releasing, e.g. NaHCO3 and citric acid
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/22—Halogen free composition
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/18—Applications used for pipes
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- C—CHEMISTRY; METALLURGY
- 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
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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- Polymers & Plastics (AREA)
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- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
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Abstract
The invention discloses a kind of fire-retardant air-blowing micro-pipes, and the micro-pipe layer including silicon core layer and extrusion molding outside silicon core layer, silicon core layer is made of silicon substrate high molecular material, and micro-pipe layer is made of fire proofing；In the formula of fire proofing, including, 50~70 parts of flame retardant polyurethane；8~12 parts of foaming agent；10~15 parts of glass fibre；The flame retardant polyurethane of the above component, foaming agent and glass fibre mixing are uniformly put into extruding machine afterwards, squeezes out and obtains micro-pipe pellet；Be added surface modifier into micro-pipe pellet, the mass percent that surface modifier accounts for micro-pipe pellet is 5%~10%, and the two mixing is uniformly put into extruding machine afterwards, using pull-tube type mold silicon core layer outside extrusion moulding micro-pipe layer.Air-blowing micro-pipe of the invention, flame retardant polyurethane has extremely low dynamic friction coefficient and excellent flame retardant property, foaming agent is added in micro-pipe layer fire proofing formula, so that forming the aperture of uniformly continuous inside micro-pipe layer, not only micro-pipe weight can have been reduced but also the contact area between micro-pipe and micro- cable can be reduced, reduced frictional force.
Description
Technical field
The present invention relates to air-blowing micro-cable technical fields, and in particular to a kind of low-smoke non-halogen flame-retardant air-blowing micro-pipe.
Background technique
Air-blowing micro-cable technology was introduced into the country in 2002, and by development these years, many regions have very at home
Good application, this technology is blown into micro-pipe in the main pipe laid first, then according to different demands, respectively difference
Micro- cable of type is blown into micro-pipe, this technology is compared with traditional fiber cable laying, and the effect of under tension is smaller, but is needed
Meet the requirement supplied gas, therefore system has very high requirement to size (or cable diameter), the weight of entire optical cable, also
Ensure to maintain certain rigidity and skin-friction force.Traditional central tubular air-blowing minisize optical cable generally passes through air-blowing machine and is laid in
It is in the tubing of high density polyethylene (HDPE) that inside, which is outside silicon core, and the flame retardant property of polyvinyl piping materials is insufficient, and dynamic friction coefficient is big, makes
It obtains air-blowing micro-cable and does not have the ability for realizing long range air-blowing.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of low-smoke non-halogen flame-retardant air-blowing micro-pipe, flame retardant polyurethane has pole
Low dynamic friction coefficient and excellent flame retardant property are added to foaming agent in micro-pipe layer fire proofing formula, so that in micro-pipe layer
Portion forms the aperture of uniformly continuous, can not only reduce micro-pipe weight but also can reduce the contact area between micro-pipe and micro- cable, and subtract
Few frictional force, further decreases the dynamic friction coefficient of micro- cable, so that air-blowing micro-cable has the ability for realizing long range air-blowing.
In order to solve the above-mentioned technical problems, the present invention provides a kind of low-smoke non-halogen flame-retardant air-blowing micro-pipes, including silicon core layer
With micro-pipe layer of the extrusion molding outside silicon core layer, the silicon core layer is made of silicon substrate high molecular material, and the micro-pipe layer is by fire proofing
It is made；In the formula of the fire proofing, in parts by weight, including,
50~70 parts of flame retardant polyurethane；
8~12 parts of foaming agent；
10~15 parts of glass fibre；
The flame retardant polyurethane of the above component, foaming agent and glass fibre mixing are uniformly put into extruding machine afterwards, extrusion obtains
Obtain micro-pipe pellet；
Surface modifier is added into the micro-pipe pellet, the mass percent that surface modifier accounts for micro-pipe pellet is 5%
~10%, the two mixing uniformly afterwards put into extruding machine in, using pull-tube type mold silicon core layer outside extrusion moulding micro-pipe layer.
In order to solve the above-mentioned technical problems, the present invention provides a kind of low-smoke non-halogen flame-retardant air-blowing micro-pipes, including silicon core layer
With micro-pipe layer of the extrusion molding outside silicon core layer, the silicon core layer is made of silicon substrate high molecular material, and the micro-pipe layer is by fire proofing
It is made；In the formula of the fire proofing, in parts by weight, including,
The flame retardant polyurethane of the above component, plasticizer, glass fibre and polyethylene glycol mixing are uniformly put into extruding machine afterwards
In, it squeezes out and obtains micro-pipe pellet；
Surface modifier is added into the micro-pipe pellet, the mass percent that surface modifier accounts for micro-pipe pellet is 5%
~10%, the two mixing uniformly afterwards put into extruding machine in, using pull-tube type mold silicon core layer outside extrusion moulding micro-pipe layer.
It further comprise in the formula of the flame retardant polyurethane, according to parts by weight in a preferred embodiment of the present invention
Meter, including,
72~86 parts of polyurethane；
20~32 parts of fire retardant；
3~6 parts of carbon black.
In a preferred embodiment of the present invention, further comprise the surface modifier be modified silicon oil.
It further comprise the foaming agent is calcium carbonate or magnesium carbonate or carbonic acid in a preferred embodiment of the present invention
Hydrogen sodium.
In a preferred embodiment of the present invention, further comprise the glass fibre be short glass fiber, it is described be chopped
Glass fibre length is 0.5-1.5mm, and the diameter of the short glass fiber is 10-20 μm.
It further comprise the fire retardant is aluminium hydroxide or red phosphorus or phosphoric acid in a preferred embodiment of the present invention
Ester.
In a preferred embodiment of the present invention, further comprise the plasticizer be di-n-octyl phthalate or neighbour
Phthalic acid di-sec-octyl.
It further comprise that the preparation method of the modified epoxy is in a preferred embodiment of the present invention：By 56 parts
Epoxy resin and 22 parts of dimethyl diethoxysilanes are uniformly mixed, and 8 parts of surface modifier dibutyl tin dilaurates are added, rise
Distilled water is added dropwise to 108 DEG C in temperature, is warming up to 112 DEG C, reacts 10h, then adds 4 parts of curing agent, stir evenly, at 200 DEG C
Lower heating 2.8h, obtains modified epoxy.
In a preferred embodiment of the present invention, further comprise the curing agent be inclined benzoic anhydride and methyl tetrahydro phthalic anhydride
Mixture, the weight ratio of the two are 2:5.
One, low-smoke non-halogen flame-retardant air-blowing micro-pipe of the invention, the silicon core layer prepared using silicon substrate high molecular material, surface
Chemical energy is lower, and dynamic friction coefficient is less than 0.1；It is added to flame retardant polyurethane and foaming agent in micro-pipe layer fire proofing formula, is hindered
There is flame-retardant polyurethane the dynamic friction coefficient of extremely low (less than 0.08) and excellent flame retardant property, the foaming agent of addition to make micro-pipe layer
Inside forms the aperture of uniformly continuous, can not only reduce the weight of micro-pipe but also can reduce the contact surface between micro-pipe and micro- cable
Product reduces frictional force, further decreases the dynamic friction coefficient of micro-pipe, so that air-blowing micro-cable has the energy for realizing long range air-blowing
Power.
Secondly, be added to surface modifier in micro-pipe layer material of the invention, can reduce the viscosity of micro-pipe layer, micro-pipe system
After the completion of standby, the micro-pipe collection of more same sizes or different size is bundled together, when completing main pipe production, micro-pipe and main pipe
Between will not glue it is glutinous.
Thirdly, be added to glass fibre in micro-pipe layer material of the invention, can be improved the intensity of micro-pipe layer.
Four, be added to modified modified epoxy resin and polyethylene glycol in micro-pipe layer material of the invention, polyethylene glycol with
Modified epoxy generates interfacial interaction by physics and chemical mode, on the one hand by Hydrogenbond, forms mixture,
So that there are more soft segments in epoxy resin cure network structure, the volume and density of free volume are increased, freely
Volume is the random hole for piling up generation of segment in material structure, is that the part spatial volume not occupied by strand provides
The space of sub-chain motion, when by applied stress, free volume is bigger, strand warm-up movement is easier, and then alleviates and answer
Power is concentrated, and the environmental stress resistance of air-blowing micro-pipe is improved.
Specific embodiment
The present invention is further explained in the light of specific embodiments, so that those skilled in the art can be preferably
Understand the present invention and can be practiced, but illustrated embodiment is not as a limitation of the invention.
Embodiment 1
Embodiment 1 discloses a kind of low-smoke non-halogen flame-retardant air-blowing micro-pipe, micro- outside silicon core layer including silicon core layer and extrusion molding
Tube layer, silicon core layer are made of silicon substrate high molecular material, and micro-pipe layer is made of fire proofing；The formula such as table of micro-pipe layer fire proofing
Shown in 1：
Formula table in 1 embodiment 1 of table
| Component | Content (parts by weight) |
| Flame retardant polyurethane | 50 |
| Foaming agent | 8 |
| Glass fibre | 13 |
Embodiment 2
Embodiment 2 discloses a kind of low-smoke non-halogen flame-retardant air-blowing micro-pipe, micro- outside silicon core layer including silicon core layer and extrusion molding
Tube layer, silicon core layer are made of silicon substrate high molecular material, and micro-pipe layer is made of fire proofing；The formula such as table of micro-pipe layer fire proofing
Shown in 2：
Formula table in 2 embodiment 2 of table
| Component | Content (parts by weight) |
| Flame retardant polyurethane | 70 |
| Foaming agent | 12 |
| Glass fibre | 15 |
Embodiment 3
Embodiment 3 discloses a kind of low-smoke non-halogen flame-retardant air-blowing micro-pipe, micro- outside silicon core layer including silicon core layer and extrusion molding
Tube layer, silicon core layer are made of silicon substrate high molecular material, and micro-pipe layer is made of fire proofing；The formula such as table of micro-pipe layer fire proofing
Shown in 3：
Formula table in 3 embodiment 3 of table
| Component | Content (parts by weight) |
| Flame retardant polyurethane | 60 |
| Foaming agent | 10 |
| Glass fibre | 10 |
Specifically, the forming process of low-smoke non-halogen flame-retardant air-blowing micro-pipe is as follows in above-described embodiment 1~3：
The flame retardant polyurethane of the above component, foaming agent and glass fibre mixing are uniformly put into extruding machine afterwards, extrusion obtains
Obtain micro-pipe pellet；
Be added surface modifier into micro-pipe pellet, surface modifier account for the mass percent of micro-pipe pellet be 5%~
10%, the two mixing uniformly afterwards put into extruding machine in, using pull-tube type mold silicon core layer outside extrusion moulding micro-pipe layer.
Specifically, each component selection is as follows in above-described embodiment 1~3：
Above-mentioned surface modifier is modified silicon oil.
Above-mentioned foaming agent is calcium carbonate or magnesium carbonate or sodium bicarbonate.
Above-mentioned glass fibre is short glass fiber, and short glass fiber length is 0.5-1.5mm, short glass fiber
Diameter is 10-20 μm.
In the formula of above-mentioned flame retardant polyurethane, include in parts by weight,
The first proportion：72 parts of polyurethane, 20 parts of fire retardant, 3 parts of carbon black.
Second of proportion：86 parts of polyurethane, 32 parts of fire retardant, 6 parts of carbon black.
The third proportion：79 parts of polyurethane, 26 parts of fire retardant, 4.5 parts of carbon black.
In 1~embodiment of embodiment 3, the formula of flame retardant polyurethane uniformly select the first match or second proportion or
Then the third is matched.
Embodiment 4
Embodiment 4 discloses a kind of low-smoke non-halogen flame-retardant air-blowing micro-pipe, micro- outside silicon core layer including silicon core layer and extrusion molding
Tube layer, silicon core layer are made of silicon substrate high molecular material, and micro-pipe layer is made of fire proofing；The formula such as table of micro-pipe layer fire proofing
Shown in 4：
Formula table in 4 embodiment 4 of table
| Component | Content (parts by weight) |
| Fire-retardant nylon | 50 |
| Plasticizer | 8 |
| Modified epoxy | 15 |
| Polyethylene glycol | 5 |
Embodiment 5
Embodiment 5 discloses a kind of low-smoke non-halogen flame-retardant air-blowing micro-pipe, micro- outside silicon core layer including silicon core layer and extrusion molding
Tube layer, silicon core layer are made of silicon substrate high molecular material, and micro-pipe layer is made of fire proofing；The formula such as table of micro-pipe layer fire proofing
Shown in 5：
Formula table in 5 embodiment 5 of table
| Component | Content (parts by weight) |
| Fire-retardant nylon | 70 |
| Plasticizer | 12 |
| Modified epoxy | 10 |
| Polyethylene glycol | 3 |
Embodiment 6
Embodiment 6 discloses a kind of low-smoke non-halogen flame-retardant air-blowing micro-pipe, micro- outside silicon core layer including silicon core layer and extrusion molding
Tube layer, silicon core layer are made of silicon substrate high molecular material, and micro-pipe layer is made of fire proofing；The formula such as table of micro-pipe layer fire proofing
Shown in 6：
Formula table in 6 embodiment 6 of table
| Component | Content (parts by weight) |
| Fire-retardant nylon | 60 |
| Plasticizer | 10 |
| Modified epoxy | 13 |
| Polyethylene glycol | 4 |
Specifically, the forming process of low-smoke non-halogen flame-retardant air-blowing micro-pipe is as follows in above-described embodiment 4~6：
The flame retardant polyurethane of the above component, plasticizer, glass fibre and polyethylene glycol mixing are uniformly put into extruding machine afterwards
In, it squeezes out and obtains micro-pipe pellet；
Be added surface modifier into micro-pipe pellet, surface modifier account for the mass percent of micro-pipe pellet be 5%~
10%, the two mixing uniformly afterwards put into extruding machine in, using pull-tube type mold silicon core layer outside extrusion moulding micro-pipe layer.
Specifically, each component selection is as follows in above-described embodiment 4~6：
Above-mentioned surface modifier is modified silicon oil.
Above-mentioned plasticizer is di-n-octyl phthalate or di-sec-octyl phthalate.
The preparation method of above-mentioned modified epoxy is：56 parts of epoxy resin and 22 parts of dimethyl diethoxysilanes are mixed
It closes uniformly, 8 parts of surface modifier dibutyl tin dilaurates is added, be warming up to 108 DEG C, distilled water is added dropwise, is warming up to 112 DEG C,
10h is reacted, 4 parts of curing agent is then added, stirs evenly, heat 2.8h at 200 DEG C, obtain modified epoxy.
Above-mentioned curing agent is the mixture of inclined benzoic anhydride and methyl tetrahydro phthalic anhydride, and the weight ratio of the two is 2:5.
Embodiment described above is only to absolutely prove preferred embodiment that is of the invention and being lifted, protection model of the invention
It encloses without being limited thereto.Those skilled in the art's made equivalent substitute or transformation on the basis of the present invention, in the present invention
Protection scope within.Protection scope of the present invention is subject to claims.
Claims (10)
1. a kind of low-smoke non-halogen flame-retardant air-blowing micro-pipe, it is characterised in that：Micro-pipe layer including silicon core layer and extrusion molding outside silicon core layer,
The silicon core layer is made of silicon substrate high molecular material, and the micro-pipe layer is made of fire proofing；In the formula of the fire proofing,
In parts by weight, including,
50~70 parts of flame retardant polyurethane；
8~12 parts of foaming agent；
10~15 parts of glass fibre；
The flame retardant polyurethane of the above component, foaming agent and glass fibre mixing are uniformly put into extruding machine afterwards, it is micro- to squeeze out acquisition
Pipe pellet；
Be added surface modifier into the micro-pipe pellet, surface modifier account for the mass percent of micro-pipe pellet be 5%~
10%, the two mixing uniformly afterwards put into extruding machine in, using pull-tube type mold silicon core layer outside extrusion moulding micro-pipe layer.
2. a kind of low-smoke non-halogen flame-retardant air-blowing micro-pipe, it is characterised in that：Micro-pipe layer including silicon core layer and extrusion molding outside silicon core layer,
The silicon core layer is made of silicon substrate high molecular material, and the micro-pipe layer is made of fire proofing；In the formula of the fire proofing,
In parts by weight, including,
50~70 parts of fire-retardant nylon；
8~12 parts of plasticizer；
10~15 parts of modified epoxy；
3~5 parts of polyethylene glycol；
The flame retardant polyurethane of the above component, plasticizer, glass fibre and polyethylene glycol mixing are uniformly put into extruding machine afterwards, squeezed
Micro-pipe pellet is obtained out；
Be added surface modifier into the micro-pipe pellet, surface modifier account for the mass percent of micro-pipe pellet be 5%~
10%, the two mixing uniformly afterwards put into extruding machine in, using pull-tube type mold silicon core layer outside extrusion moulding micro-pipe layer.
3. low-smoke non-halogen flame-retardant air-blowing micro-pipe as described in claim 1, it is characterised in that：The formula of the flame retardant polyurethane
In, in parts by weight, including,
72~86 parts of polyurethane；
20~32 parts of fire retardant；
3~6 parts of carbon black.
4. low-smoke non-halogen flame-retardant air-blowing micro-pipe as claimed in claim 1 or 2, it is characterised in that：The surface modifier is to change
Property silicone oil.
5. low-smoke non-halogen flame-retardant air-blowing micro-pipe as described in claim 1, it is characterised in that：The foaming agent be calcium carbonate or
Magnesium carbonate or sodium bicarbonate.
6. low-smoke non-halogen flame-retardant air-blowing micro-pipe as described in claim 1, it is characterised in that：The glass fibre is staple glass
Fiber, the short glass fiber length are 0.5-1.5mm, and the diameter of the short glass fiber is 10-20 μm.
7. low-smoke non-halogen flame-retardant air-blowing micro-pipe as claimed in claim 2, it is characterised in that：The fire retardant be aluminium hydroxide or
Person's red phosphorus or phosphate.
8. low-smoke non-halogen flame-retardant air-blowing micro-pipe as claimed in claim 2, it is characterised in that：The plasticizer is phthalic acid
Di-n-octyl or di-sec-octyl phthalate.
9. low-smoke non-halogen flame-retardant air-blowing micro-pipe as claimed in claim 2, it is characterised in that：The preparation of the modified epoxy
Method is：56 parts of epoxy resin and 22 parts of dimethyl diethoxysilanes are uniformly mixed, 8 parts of two laurels of surface modifier are added
Sour dibutyl tin is warming up to 108 DEG C, and distilled water is added dropwise, and is warming up to 112 DEG C, reacts 10h, then adds 4 parts of curing agent, stir
It mixes uniformly, heats 2.8h at 200 DEG C, obtain modified epoxy.
10. low-smoke non-halogen flame-retardant air-blowing micro-pipe as claimed in claim 9, it is characterised in that：The curing agent is inclined benzoic anhydride
With the mixture of methyl tetrahydro phthalic anhydride, the weight ratio of the two is 2:5.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810803178.8A CN108897109A (en) | 2018-07-20 | 2018-07-20 | Low-smoke non-halogen flame-retardant air-blowing micro-pipe |
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| CN201810803178.8A CN108897109A (en) | 2018-07-20 | 2018-07-20 | Low-smoke non-halogen flame-retardant air-blowing micro-pipe |
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