CN103215105B - Middle-pressure fire resistant oil taking tricresyl phosphate as base oil and production method thereof - Google Patents
Middle-pressure fire resistant oil taking tricresyl phosphate as base oil and production method thereof Download PDFInfo
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- 239000003921 oil Substances 0.000 title claims abstract description 37
- 230000009970 fire resistant effect Effects 0.000 title claims abstract description 30
- YSMRWXYRXBRSND-UHFFFAOYSA-N TOTP Chemical compound CC1=CC=CC=C1OP(=O)(OC=1C(=CC=CC=1)C)OC1=CC=CC=C1C YSMRWXYRXBRSND-UHFFFAOYSA-N 0.000 title claims abstract description 24
- 239000002199 base oil Substances 0.000 title claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 235000019198 oils Nutrition 0.000 claims abstract description 36
- 239000002253 acid Substances 0.000 claims abstract description 13
- -1 octyl ester Chemical class 0.000 claims abstract description 10
- 235000012424 soybean oil Nutrition 0.000 claims abstract description 7
- 239000003549 soybean oil Substances 0.000 claims abstract description 7
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000012964 benzotriazole Substances 0.000 claims abstract description 5
- 239000003054 catalyst Substances 0.000 claims description 16
- 239000000047 product Substances 0.000 claims description 15
- IWDCLRJOBJJRNH-UHFFFAOYSA-N p-cresol Chemical compound CC1=CC=C(O)C=C1 IWDCLRJOBJJRNH-UHFFFAOYSA-N 0.000 claims description 14
- ZFXVRMSLJDYJCH-UHFFFAOYSA-N calcium magnesium Chemical compound [Mg].[Ca] ZFXVRMSLJDYJCH-UHFFFAOYSA-N 0.000 claims description 12
- 239000002131 composite material Substances 0.000 claims description 12
- XHXFXVLFKHQFAL-UHFFFAOYSA-N phosphoryl trichloride Chemical compound ClP(Cl)(Cl)=O XHXFXVLFKHQFAL-UHFFFAOYSA-N 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- QHPQWRBYOIRBIT-UHFFFAOYSA-N 4-tert-butylphenol Chemical compound CC(C)(C)C1=CC=C(O)C=C1 QHPQWRBYOIRBIT-UHFFFAOYSA-N 0.000 claims description 6
- 239000004593 Epoxy Substances 0.000 claims description 6
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 6
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 6
- 238000004821 distillation Methods 0.000 claims description 6
- 230000032050 esterification Effects 0.000 claims description 6
- 238000005886 esterification reaction Methods 0.000 claims description 6
- 150000002148 esters Chemical class 0.000 claims description 6
- 239000012452 mother liquor Substances 0.000 claims description 6
- 230000007935 neutral effect Effects 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 5
- 238000000746 purification Methods 0.000 claims description 5
- 238000004458 analytical method Methods 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 4
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 3
- 244000275012 Sesbania cannabina Species 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 239000007795 chemical reaction product Substances 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000005304 joining Methods 0.000 claims description 3
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000002808 molecular sieve Substances 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 3
- 238000000967 suction filtration Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 230000002269 spontaneous effect Effects 0.000 abstract description 7
- 238000005299 abrasion Methods 0.000 abstract description 3
- 238000009835 boiling Methods 0.000 abstract description 3
- 239000000460 chlorine Substances 0.000 abstract description 3
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 abstract 1
- 230000032683 aging Effects 0.000 abstract 1
- UQRSMZHDWDMLDH-UHFFFAOYSA-N bis(2-tert-butylphenyl) phenyl phosphate Chemical compound CC(C)(C)C1=CC=CC=C1OP(=O)(OC=1C(=CC=CC=1)C(C)(C)C)OC1=CC=CC=C1 UQRSMZHDWDMLDH-UHFFFAOYSA-N 0.000 abstract 1
- 229910052801 chlorine Inorganic materials 0.000 abstract 1
- 238000002485 combustion reaction Methods 0.000 abstract 1
- 239000006260 foam Substances 0.000 abstract 1
- 238000005461 lubrication Methods 0.000 abstract 1
- DCKVNWZUADLDEH-UHFFFAOYSA-N sec-butyl acetate Chemical group CCC(C)OC(C)=O DCKVNWZUADLDEH-UHFFFAOYSA-N 0.000 description 4
- 239000002932 luster Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- DYUQAZSOFZSPHD-UHFFFAOYSA-N Phenylpropyl alcohol Natural products CCC(O)C1=CC=CC=C1 DYUQAZSOFZSPHD-UHFFFAOYSA-N 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000005272 metallurgy Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- VAJVDSVGBWFCLW-UHFFFAOYSA-N 3-Phenyl-1-propanol Chemical compound OCCCC1=CC=CC=C1 VAJVDSVGBWFCLW-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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- Lubricants (AREA)
Abstract
The invention relates to middle-pressure fire resistant oil taking tricresyl phosphate as base oil, and a production method of the middle-pressure fire resistant oil. The middle-pressure fire resistant oil comprises the following components: tricresyl phosphate and di(tertiary butyl phenyl) phenyl phosphate in the weight ratio of (1.5-1.8):(1.1-1.13), epoxidized soybean oil octyl ester which is 0.8-1.0% of the total weight and benzotriazole which is 0.3-0.5% of the total weight. The middle-pressure fire resistant oil provided by the invention has the characteristics of low chlorine content, low acid value and high spontaneous ignition point and boiling point, and has the advantages of good lubrication, abrasion resistance, aging resistance, foam resistance, combustion resistance, thermal stability and the like.
Description
Technical field
The invention belongs to fire resistant oil field, especially a kind of middle pressure fire resistant oil and production method thereof of making base oil with Tritolyl Phosphate.
Background technology
KR series fire resistant lubricant is to aim at high temperature, high pressure or have the high-performance fire resistant oil using under naked light Working environment, this product is to take ester as basic material, and in addition other multiple agent modulation forms, be widely used in generating, lubricated and the hydraulic efficiency system of metallurgy and main equipment, also can be used for military project and aviation field.KR-99-G(high pressure wherein) and in KR-99-Z(press) fire resistant oil is the dedicated hydraulic fire resistant oil for the height of automobile generating unit, pressure speed governing and Controlling System, the use temperature that KR-99-G and KR-99-Z fire resistant oil have is high, operating pressure is large, spontaneous ignition temperature is high, resistivity is high, and lubricity is good, good cooling results, the advantages such as rapid heat dissipation are the ideal products of replace imported fire resistant oil.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art part, provide a kind of as done middle pressure fire resistant oil and the production method thereof of base oil with Tritolyl Phosphate, this fire resistant oil has that cl content is low, acid number is low, spontaneous ignition temperature and the high characteristic of boiling point, there is good oilness, resistance to abrasion, resistance to deterioration, anti-spumescence, the advantages such as non-flame properties and heat-resistant quality energy.
The technical scheme that the present invention realizes object is as follows:
A middle pressure fire resistant oil of making base oil with Tritolyl Phosphate, composition is as follows:
Tritolyl Phosphate: two (tert-butyl-phenyl) phenyl phosphate ester weight ratio=1.5 ~ 1.8:1.1 ~ 1.13, then add the epoxy soybean oil monooctyl ester of the 0.8-1.0% of gross weight, 0.3-0.5% benzotriazole.
The production method of doing the middle pressure fire resistant oil of base oil with Tritolyl Phosphate, step is as follows:
(1) qualified base oil Tritolyl Phosphate (TCP): two (tert-butyl-phenyl) phenyl phosphate ester (TBPP) by a certain percentage: 1.5 ~ 1.8:1.1 ~ 1.13 are mixed, and fully stir 2.5 hours;
(2) the oil product that is mixed in getting is (1) put into and is stipulated that dry, clean constant volume device adds by joining oil product quantity, adds 0.9% epoxy soybean oil, adds 0.4% phenylpropyl alcohol three nitrogen files, fully stirs into mother liquor, and temperature is controlled at 60 ± 2 ℃;
(3) (1) the (2) mother liquor completing is added in a still, fully stirs, temperature is controlled 65 ± 2 ℃, balance 3 ~ 5 o'clock;
(4) (3) will filtering through 50-70 order of completing, temperature is controlled at 65 ± 2 ℃, balance 14 ~ 16 o'clock;
(5) what complete, (4) through sampling, do total analysis, the qualified i.e. middle fire resistant oil of pressing.
And the production method of described Tritolyl Phosphate is:
Adopt stock yard, p-cresol and phosphorus oxychloride in molar ratio: 2.2-2.6:1-1.3 is esterification under the effect of catalyzer calcium magnesium composite catalyst, between catalyst levels is 0.22-0.3wt%, p-cresol, acid discharge; Neutral equilibrium temperature is controlled 145 ℃, underpressure distillation 730-750mmHg left and right, and 380-390 ℃, then rectification and purification 730-750mmHg, 380-390 ℃, filters 50-60 order and filters, and getting its fine work is base oil, in the middle of it, the requirement of p-cresol Non-scale.
And the production method of described two (tert-butyl-phenyl) phenyl phosphate ester is as follows:
Adopt raw material p-tert-butylphenol, phenol and phosphorus oxychloride, in molar ratio: 2:2.4 ~ 3.1:1.8 ~ 2.2, esterification under the effect of catalyzer calcium magnesium composite catalyst, catalyst levels is the p-tert-butylphenol of 0.15wt%, temperature is controlled at 120-150 ℃, acid discharge, neutral equilibrium, underpressure distillation 740-755mmHg, 390-400 ℃, then rectifying 740-755mmHg, 390-400 ℃ of purification, filter 50-60 order and filter, getting its fine work is base oil.
And the preparation method's of described calcium magnesium composite catalyst step is as follows:
(1) claim HZSM-5 type molecular sieve, calcium sulfate, magnesium chloride, sesbania powder, in the reactor adding water to;
(2) stir, heat, control temperature of reaction at 80 ± 5 ℃, heating 6 ~ 8h;
(3) reaction product is filtered, suction filtration, washes with water;
(4) the product after washing is dried, grind, get≤100 object catalyzer, roasting, obtains calcium magnesium composite catalyst.
The parts by weight of raw material are as follows:
Advantage of the present invention and beneficial effect are:
1, to have cl content low for middle pressure fire resistant oil provided by the invention, and acid number is low, and the characteristic that spontaneous ignition temperature and boiling point are high has good oilness, resistance to abrasion, resistance to deterioration, anti-spumescence, the advantages such as non-flame properties and heat-resistant quality energy.
2, this product application, in industry high temperature, high pressure, oil pumping systems such as metallurgy, machinery, military projects, also extends near the system of working other high temperature heat source or naked light.
3, preparation method of the present invention is simple, process control is thin, and acid number is controlled obviously, and the product indices of producing is all good compared with currently available products index.
Embodiment
Below in conjunction with embodiment, following embodiment is illustrative, is not determinate, can not limit protection scope of the present invention with following embodiment.
Two (tert-butyl-phenyl) phenyl phosphate ester is called for short tertiary butyl ester.
A middle pressure fire resistant oil of making base oil with Tritolyl Phosphate, composition is as follows:
It is just like Tritolyl Phosphate (TCP): tertiary butyl ester (TBPP) weight ratio=1.5 ~ 1.8:1.1 ~ 1.13, then add 0.9% epoxy soybean oil monooctyl ester and 0.4% benzotriazole of gross weight.
Production method is as follows:
(1) qualified base oil Tritolyl Phosphate (TCP): tertiary butyl ester (TBPP) by a certain percentage: 1.5 ~ 1.8:1.1 ~ 1.13 are mixed, and fully stir 2.5 hours;
(2) the oil product that is mixed in getting is (1) put into and is stipulated that dry, clean constant volume device adds by joining oil product quantity, adds 0.9% epoxy soybean oil monooctyl ester, adds 0.4% phenylpropyl alcohol triazole, fully stirs into mother liquor, and temperature is controlled at 60 ± 2 ℃;
(3) (1) the (2) mother liquor completing is added in a still, fully stirs, temperature is controlled 65 ± 2 ℃, balance 3 ~ 5 o'clock;
(4) (3) will filtering through 50-60 order of completing, temperature is controlled at 65 ± 2 ℃, balance 14 ~ 16 o'clock;
(5) what complete, (4) through sampling, do total analysis, qualified, become the finished product, press fire resistant oil in, with cleaning-drying pail pack, be packaged as processed oil and weigh afterwards, put in storage.
The main component production method of described middle pressure fire resistant oil is as follows:
A. the technical process of Tritolyl Phosphate: (TCP)
Adopt stock yard, p-cresol and phosphorus oxychloride in molar ratio: 2.2-2.6:1-1.3 between catalyzer (calcium magnesium composite catalyst) 0.22%-0.3%(presses, p-cresol calculates) act under esterification, acid discharge; Neutral equilibrium temperature is controlled 145 ℃, underpressure distillation (730-750mmHg left and right, 380-390 ℃), rectification and purification (730-750mmHg, 380-390 ℃) again, negative pressure control is more than 680 mmhg, rear secondary filter 50-60 order filters, and getting its fine work is base oil used.
B. the technical process of two (tert-butyl-phenyl) phenyl phosphate ester: (TBPP)
Adopt raw material p-tert-butylphenol, phenol and phosphorus oxychloride, in molar ratio: 2:2.4 ~ 3.1:1.8 ~ 2.2, at catalyzer (calcium magnesium composite catalyst) 0.15%(, pressing p-tert-butylphenol calculates) esterification under effect, temperature is controlled at 120-150 ℃, acid discharge, neutral equilibrium, underpressure distillation (740-755mmHg, 390-400 ℃), then rectifying (740-755mmHg, 390-400 ℃) purify, control negative pressure more than 690 mmhg, secondary filter 50-60 order filters, and getting its fine work is base oil used.
The preparation method of calcium magnesium composite catalyst, step is as follows:
(1) claim HZSM-5 type molecular sieve, calcium sulfate, magnesium chloride, sesbania powder, in the reactor adding water to;
(2) stir, heat, control temperature of reaction at 80 ± 5 ℃, heating 6 ~ 8h;
(3) reaction product is filtered, suction filtration, washes with water;
(4) the product after washing is dried, grind, get≤100 object catalyzer, roasting, obtains calcium magnesium composite catalyst.
The parts by weight of raw material are as follows:
Table 1 Tritolyl Phosphate quality and technical index
| Project | Index |
| Color and luster (Pt-Co) # ≤ | 80 |
| 20 ℃ of g/cm of density 3 ≤ | 1.180 |
| Acid number mgKOH/g≤ | 0.080 |
| 40 ℃ of mm of viscosity 2/s ≥ | 30 |
| Flash-point ℃ >= | 225 |
| Spontaneous ignition temperature ℃ >= | 430 |
| Cl content mg/g≤ | 35 |
Table 2 tertiary butyl ester quality and technical index
| Project | Index |
| Color and luster (Pt-Co) # ≤ | 80 |
| 20 ℃ of g/cm of density 3 ≤ | 1.170 |
| Acid number mgKOH/g≤ | 0.080 |
| 40 ℃ of mm of viscosity 2/s ≥ | 45 |
| Flash-point ℃ >= | 235 |
| Spontaneous ignition temperature ℃ >= | 530 |
| Cl content mg/g≤ | 50 |
In table 3, press fire resistant oil mass analysis as following table
| Project | Index |
| Color and luster (Pt-C o） #≤ | 80 |
| Acid number mgKOH/ g≤ | 0.080 |
| 20 ℃ of density. g/ CM 3 | 1.130-1.170 |
| 40 ℃ of viscosity. MM 2/s | 29-36 |
| Flash-point ℃ | 235 |
| Granularity SAEA-6D level≤ | 6 |
| Pour point ℃≤ | -18 |
| Spontaneous ignition temperature (triangle is also) ℃ >= | 530 |
| (hot plate) ℃ >= | 700 |
| Chlorinity %≤ | 0.005 |
| Moisture ppm≤ | 1000 |
Claims (5)
1. with Tritolyl Phosphate, do a middle pressure fire resistant oil for base oil, it is characterized in that: composition is as follows:
Tritolyl Phosphate: two (tert-butyl-phenyl) phenyl phosphate ester weight ratio=1.5～1.8:1.1～1.13, the epoxy soybean oil monooctyl ester of the 0.8-1.0% of gross weight, 0.3-0.5% benzotriazole.
2. the production method of doing the middle pressure fire resistant oil of base oil with Tritolyl Phosphate as claimed in claim 1, is characterized in that: step is as follows:
(1) qualified base oil Tritolyl Phosphate: two (tert-butyl-phenyl) phenyl phosphate ester by a certain percentage: 1.5～1.8:1.1～1.13 are mixed, and fully stir 2.5 hours;
(2) the oil product that is mixed in getting is (1) put into and is stipulated that dry, clean constant volume device adds by joining oil product quantity, adds the epoxy soybean oil monooctyl ester of 0.8-1.0%, adds the benzotriazole of 0.3-0.5%, fully stirs into mother liquor, and temperature is controlled at 60 ± 2 ℃;
(3) (1) the (2) mother liquor completing is added in still, fully stirs, temperature is controlled 65 ± 2 ℃, balance 3～5 hours;
(4) (3) will filtering through 50-70 order of completing, temperature is controlled at 65 ± 2 ℃, balance 14～16 hours;
(5) what complete, (4) through sampling, do total analysis, the qualified i.e. middle fire resistant oil of pressing.
3. according to doing the production method of the middle pressure fire resistant oil of base oil with Tritolyl Phosphate described in right 2, it is characterized in that: the production method of described Tritolyl Phosphate is:
Adopt stock yard, p-cresol and phosphorus oxychloride in molar ratio: 2.2-2.6:1-1.3 is esterification under the effect of catalyzer calcium magnesium composite catalyst, catalyst levels be between, the 0.22-0.3wt% of p-cresol, acid discharge; Neutral equilibrium temperature is controlled 145 ℃, underpressure distillation 730-750mmHg, and 380-390 ℃, then rectification and purification 730-750mmHg, 380-390 ℃, filters 50-60 order and filters, and getting its fine work is base oil.
4. according to doing the production method of the middle pressure fire resistant oil of base oil with Tritolyl Phosphate described in right 2, it is characterized in that: the production method of described two (tert-butyl-phenyl) phenyl phosphate ester is as follows:
Adopt raw material p-tert-butylphenol, phenol and phosphorus oxychloride, in molar ratio: 2:2.4～3.1:1.8～2.2, esterification under the effect of catalyzer calcium magnesium composite catalyst, catalyst levels is the 0.15wt% of p-tert-butylphenol, temperature is controlled at 120-150 ℃, acid discharge, neutral equilibrium, underpressure distillation 740-755mmHg, 390-400 ℃, then rectifying 740-755mmHg, 390-400 ℃ of purification, 50-60 order filters again, and getting its fine work is base oil.
5. according to doing the production method of the middle pressure fire resistant oil of base oil with Tritolyl Phosphate described in claim 3 or 4, it is characterized in that: the preparation method's of described calcium magnesium composite catalyst step is as follows:
(1) claim HZSM-5 type molecular sieve, calcium sulfate, magnesium chloride, sesbania powder, add water in reactor;
(2) stir, heat, control temperature of reaction at 80 ± 5 ℃, heating 6～8h;
(3) reaction product is filtered, suction filtration, washes with water;
(4) the product after washing is dried, grind, get≤100 object catalyzer, roasting, obtains calcium magnesium composite catalyst;
The parts by weight of raw material are as follows:
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| CN201310121447.XA CN103215105B (en) | 2013-04-09 | 2013-04-09 | Middle-pressure fire resistant oil taking tricresyl phosphate as base oil and production method thereof |
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| CN110724582A (en) * | 2019-10-08 | 2020-01-24 | 山东瑞兴阻燃科技有限公司 | Tert-butylated triphenyl phosphate flame-retardant hydraulic oil and preparation method thereof |
| CN114181757B (en) * | 2020-09-14 | 2022-06-28 | 安美科技股份有限公司 | A kind of phosphate ester fire-resistant oil |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1231458A (en) * | 1967-09-06 | 1971-05-12 | ||
| CN101679720A (en) * | 2008-04-09 | 2010-03-24 | 住友电气工业株式会社 | Flame-retardant tube and heat-shrinkable tube using the flame-retardant tube |
| CN101983230A (en) * | 2008-03-31 | 2011-03-02 | 埃克森美孚研究工程公司 | Lubricant composition with improved varnish deposit resistance |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1231458A (en) * | 1967-09-06 | 1971-05-12 | ||
| CN101983230A (en) * | 2008-03-31 | 2011-03-02 | 埃克森美孚研究工程公司 | Lubricant composition with improved varnish deposit resistance |
| CN101679720A (en) * | 2008-04-09 | 2010-03-24 | 住友电气工业株式会社 | Flame-retardant tube and heat-shrinkable tube using the flame-retardant tube |
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