CN108731992A - A kind of preparation method of carbon fiber bundle filament test batten - Google Patents
A kind of preparation method of carbon fiber bundle filament test batten Download PDFInfo
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- CN108731992A CN108731992A CN201810250707.6A CN201810250707A CN108731992A CN 108731992 A CN108731992 A CN 108731992A CN 201810250707 A CN201810250707 A CN 201810250707A CN 108731992 A CN108731992 A CN 108731992A
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- aqueous epoxy
- maceration extract
- aqueous
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- 238000012360 testing method Methods 0.000 title claims abstract description 28
- 229920000049 Carbon (fiber) Polymers 0.000 title claims abstract description 20
- 239000004917 carbon fiber Substances 0.000 title claims abstract description 20
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 239000000835 fiber Substances 0.000 claims abstract description 53
- 239000003822 epoxy resin Substances 0.000 claims abstract description 42
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 42
- 239000000284 extract Substances 0.000 claims abstract description 29
- 238000002803 maceration Methods 0.000 claims abstract description 29
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 27
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 27
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 20
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 15
- 239000007864 aqueous solution Substances 0.000 claims abstract description 13
- 238000007598 dipping method Methods 0.000 claims abstract description 13
- 239000002318 adhesion promoter Substances 0.000 claims abstract description 7
- 238000012545 processing Methods 0.000 claims abstract description 5
- 238000002791 soaking Methods 0.000 claims abstract description 5
- 150000003014 phosphoric acid esters Chemical class 0.000 claims abstract description 4
- 229920005989 resin Polymers 0.000 claims description 9
- 239000011347 resin Substances 0.000 claims description 9
- 239000004593 Epoxy Substances 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- 238000007711 solidification Methods 0.000 claims description 6
- 230000008023 solidification Effects 0.000 claims description 6
- 238000004804 winding Methods 0.000 claims description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 4
- 229910019142 PO4 Inorganic materials 0.000 claims description 4
- 150000001412 amines Chemical class 0.000 claims description 4
- 239000008367 deionised water Substances 0.000 claims description 4
- 229910021641 deionized water Inorganic materials 0.000 claims description 4
- 150000002118 epoxides Chemical class 0.000 claims description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims description 4
- 239000001257 hydrogen Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- VALXVSHDOMUUIC-UHFFFAOYSA-N 2-methylprop-2-enoic acid;phosphoric acid Chemical compound OP(O)(O)=O.CC(=C)C(O)=O VALXVSHDOMUUIC-UHFFFAOYSA-N 0.000 claims description 3
- 239000010452 phosphate Substances 0.000 claims description 3
- -1 2- hydroxy ethyl methyl Chemical group 0.000 claims description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 2
- 235000021317 phosphate Nutrition 0.000 claims 2
- 150000003013 phosphoric acid derivatives Chemical class 0.000 claims 1
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 abstract description 12
- 241000108463 Hygrophila <snail> Species 0.000 abstract description 5
- 239000002904 solvent Substances 0.000 abstract description 4
- 238000004500 asepsis Methods 0.000 abstract description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 238000002203 pretreatment Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- VOZKAJLKRJDJLL-UHFFFAOYSA-N 2,4-diaminotoluene Chemical compound CC1=CC=C(N)C=C1N VOZKAJLKRJDJLL-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- YGTXYHBZYODOKK-UHFFFAOYSA-N ethyl 2-methylprop-2-enoate;phosphoric acid Chemical compound OP(O)(O)=O.CCOC(=O)C(C)=C YGTXYHBZYODOKK-UHFFFAOYSA-N 0.000 description 1
- 238000001802 infusion Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 125000002467 phosphate group Chemical group [H]OP(=O)(O[H])O[*] 0.000 description 1
- 239000002574 poison Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/30—Staining; Impregnating ; Fixation; Dehydration; Multistep processes for preparing samples of tissue, cell or nucleic acid material and the like for analysis
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/44—Sample treatment involving radiation, e.g. heat
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Molecular Biology (AREA)
- Reinforced Plastic Materials (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
Abstract
The present invention relates to a kind of preparation methods of carbon fiber bundle filament test batten, using the aqueous solution of aqueous epoxy resins and aqueous epoxy resin curing agent as maceration extract, carbon fibre tow is subjected to pre-soaking processing with phosphoric acid ester adhesion promoter before dipping, and some tension is applied to carbon fibre tow in dipping process, obtain mechanical property test of carbon fiber batten after baking and curing.The present invention solves the disadvantage that the test of traditional carbon fibres synnema with batten preparation process is largely solvent using acetone, it is difficult to solve the problems, such as that aqueous epoxy resins aqueous solution adheres to as maceration extract simultaneously, it is quick with operation, it is simple and practicable, have many advantages, such as asepsis environment-protecting.
Description
Technical field
The present invention relates to a kind of preparation methods of carbon fiber bundle filament test batten, belong to testing research field.
Background technology
Carbon fiber has the characteristics that high specific strength, high ratio modulus, high temperature resistant, corrosion-resistant, electrical and thermal conductivity is good, is advanced multiple
The important reinforcement of condensation material, is widely used in the fields such as space flight and aviation, communications and transportation, building energy and Leisure Sport.?
In the preparation of carbon fiber, production and application process, the mechanical property of characterization carbon fiber accurately and timely and its important.Due to carbon fiber
The tow that product is a large amount of carbon mono-filaments composition is tieed up, Mechanics Performance Testing is divided into monofilament method and synnema method, wherein monofilament method
Sample prepares before need not particularly testing, and has the characteristics that simple and quick, but usual test result is discrete larger, test process
Human factor is more, is gradually replaced by synnema method.Synnema method refer to test process fibre bundle as a whole into
Row test to ensure all monofilament while stress in test process tow needs that carbon fibre tow is prepared into survey before testing
Testing bar.Epoxy resin infusion process is generally used to carry out the preparation of carbon fiber bundle filament test batten at present, this method uses acetone
For solvent dissolved epoxy, prepared batten can accurately reflect the mechanical property of carbon fiber.But acetone is a kind of easy
Volatile organic solvent, itself has certain toxicity, and is that one kind easily system poison easily makes quick-fried chemicals, belongs to national strictly pipe
The chemicals of control suffers from stringent management and control measures, to the timely of carbon fiber mechanical property to production, purchase, transport and use
Accurate test brings many difficulties.Carbon fiber bundle filament test batten directly is prepared using aqueous epoxy resins, there are resins
The problems such as, poor adhesive force poor to fiber coherent, batten test result accuracy are poor, discrete big.
Invention content
The object of the present invention is to provide a kind of using aqueous epoxy resins as the carbon fiber bundle filament test batten of impregnating agent
Preparation method.Using the aqueous solution of aqueous epoxy resins and aqueous epoxy resin curing agent as maceration extract, by carbon before dipping
Fibre bundle carries out pre-soaking processing with phosphoric acid ester adhesion promoter, and applies centainly to carbon fibre tow in dipping process
Tension obtains mechanical property test of carbon fiber batten after baking and curing, solves traditional carbon fibres multifilament test batten system
The shortcomings that standby process largely uses acetone to be solvent, while solving aqueous epoxy resins aqueous solution and adhering to difficulty as maceration extract
The problem of.
For achieving the above object, concrete scheme is as follows：Via the configuration of maceration extract, the dipping of fibre bundle, solidification
It is obtained with removing for fibre bundle, fibre bundle pre-soaking processing is carried out before fibre bundle dipping, the maceration extract is by aqueous
Epoxy resin and aqueous epoxy resin curing agent composition.
The solid content of the aqueous epoxy resins is 40%~55%, and epoxide equivalent value is 0.16~0.25mol/
100g, viscosity are 250~1000cps.
The solid content of the aqueous epoxy resin curing agent is 40%~55%, and amine hydrogen equivalent value is 150~280, is glued
Degree is 1000~3000cps.
Specific steps include as follows：
(1) configuration of maceration extract：Deionized water will be added in aqueous epoxy resins, stir evenly, is configured to epoxy resin
The aqueous solution that mass percent is 20%~38%；Then aqueous epoxy resin curing agent is added, stirs evenly, aqueous ring is made
The mass ratio of oxygen resin maceration extract, curing agent and aqueous epoxy resins is 0.5~1：1；
(2) fibre bundle pre-treatment：Carbon fibre tow is wrapped on fixed frame, winding process applies of 1~10N
Power is impregnated 1~5 minute in mass percent concentration is 1~5% adhesion promoter aqueous solution；
The adhesion promoter is phosphate compounds, is epoxy phosphate ester, methacrylic acid phosphoric acid ester, 2- hydroxyls
One or several kinds in ethyl methacrylate phosphate.
Adhesion promoter effectively increases the interaction between carbon fibre tow and aqueous epoxy resins, increases carbon fiber
The adhesion amount for tieing up epoxy resin on tow enhances epoxy resin and interfibrous interaction after solidification, improves filament
The boundling effect of beam.
(3) dipping of fibre bundle：Step (2) treated fibre bundle is placed in the aqueous ring of step (1) together with frame
It is impregnated 1~20 minute in oxygen resin maceration extract；
(4) solidification of fibre bundle：Carbon fibre tow is stood 1~5 minute after being taken out in maceration extract together with frame, is put
Enter baking and curing 1~10 hour in 90~140 DEG C of baking oven；
(5) removing for fibre bundle refers to being removed carbon fibre tow from fixed frame using tools such as scissors.
The advantages of the present invention：
The present invention provides a kind of preparation methods of carbon fiber bundle filament test sample, solve the survey of traditional carbon fibres synnema
The shortcomings that batten preparation process on probation largely uses acetone to be solvent, has test result accurate, and operation is quick, simple and practicable,
Has many advantages, such as asepsis environment-protecting.
Specific implementation mode
Embodiment 1
(1) configuration of aqueous epoxy resins maceration extract：Aqueous epoxy resins F0404 (solid content 45%, epoxide equivalent
Value be 0.18mol/100g, viscosity 300cps) in be added deionized water, stir evenly, be configured to epoxy resin quality percentage
Than the aqueous solution for 30%；Aqueous epoxy resin curing agent F0405 is added, and (solid content 50%, amine hydrogen equivalent value are 200, viscosity
For 1500cps), the mass ratio of aqueous epoxy resins and aqueous epoxy resin curing agent is 1：1；It stirs evenly, aqueous ring is made
Oxygen resin maceration extract；
(2) fibre bundle pre-treatment：The T800 grade 12K carbon fibre tows that toray company produces are wrapped in fixed frame
On, winding process applies the tension of 5N, is impregnated 3 minutes in mass ratio is 1% epoxy phosphate aqueous solution of ester；
(3) dipping of fibre bundle：Step (2) treated fibre bundle is placed in the water-base epoxy of step (1) together with frame
It is impregnated 3 minutes in resin maceration extract；
(4) cure：Carbon fibre tow stands 2 minutes together with frame after being taken out in maceration extract, is put into 120 DEG C of baking oven
Baking and curing 3 hours；
(5) fibre bundle is removed：Carbon fibre tow is removed from fixed frame using tools such as scissors.
Embodiment 2
(1) configuration of aqueous epoxy resins maceration extract：Aqueous epoxy resins F0404 (solid content 45%, epoxide equivalent value
For 0.20mol/100g, viscosity 600cps) in be added deionized water, stir evenly, be configured to epoxy resin mass percent
For 25% aqueous solution；Aqueous epoxy resin curing agent F0405 is added, and (solid content 50%, amine hydrogen equivalent value are 250, and viscosity is
1500cps), the mass ratio of aqueous epoxy resins and aqueous epoxy resin curing agent is 0.75：1, it stirs evenly, aqueous ring is made
Oxygen resin maceration extract；
(2) fibre bundle pre-treatment：The T800 grade 12K carbon fibre tows that toray company produces are wrapped in fixed frame
On, winding process applies the tension of 3N, is impregnated 1 minute in mass ratio is 2% methacrylic acid phosphoric acid ester aqueous solution；
(3) dipping of fibre bundle：Step (2) treated fibre bundle is placed in the water-base epoxy of step (1) together with frame
It is impregnated 15 minutes in resin maceration extract；
(4) cure：Carbon fibre tow stands 4 minutes together with frame after being taken out in maceration extract, is put into 110 DEG C of baking oven
Baking and curing 5 hours；
(5) fibre bundle is removed：Carbon fibre tow is removed from fixed frame using tools such as scissors.
Embodiment 3
(1) (2) are the same as embodiment 1；
(3) dipping of fibre bundle：Step (2) treated fibre bundle is placed in the water-base epoxy of step (1) together with frame
It is impregnated 10 minutes in resin maceration extract；
(4) cure：Carbon fibre tow stands 2 minutes together with frame after being taken out in maceration extract, is put into 130 DEG C of baking oven
Baking and curing 2 hours；
(5) fibre bundle is removed：Carbon fibre tow is removed from fixed frame using tools such as scissors.
Comparative example
(1) the recipe configuration maceration extract that GB/T3362-2005 recommends, in mass ratio, epoxy resin E51 are pressed：Triethylene four
Amine：Acetone=10：1：20；
(2) the T800 grade 12K carbon fibre tows that toray company produces are wrapped on fixed frame, winding process is applied
The tension for adding 8N is subsequently placed in the maceration extract of step (1) and impregnates 10 minutes；
(3) carbon fibre tow stands 2 minutes together with frame after being taken out in maceration extract, is put into 130 DEG C of baking oven and dries
Solidification 2 hours；
(4) carbon fibre tow is removed from fixed frame using tools such as scissors.
After reinforced sheet is pasted at the carbon fiber batten both ends that above-described embodiment and comparative example are obtained, according to GB/T3362-
2005 test method carries out tensile property test, and test result is listed in table 1.Carbon fiber sample prepared by method using the present invention
Item can accurately reflect intrinsic tensile mechanical properties.
Table 1
Claims (10)
1. a kind of preparation method of carbon fiber bundle filament test batten, via the configuration of maceration extract, fibre bundle dipping, solidification and
Removing for fibre bundle is obtained, it is characterised in that the maceration extract is aqueous epoxy resins and aqueous epoxy resin curing agent
Aqueous solution.
2. preparation method according to claim 1, it is characterised in that the solid content of the aqueous epoxy resins be 40%~
55%, epoxide equivalent value is 0.16~0.25mol/100g, and viscosity is 250~1000cps.
3. preparation method according to claim 1, it is characterised in that the solid content of the aqueous epoxy resin curing agent is
40%~55%, amine hydrogen equivalent value is 150~280, and viscosity is 1000~3000cps.
4. preparation method according to claim 1, it is characterised in that the configuration of the maceration extract refers to by water-base epoxy
Deionized water is added in resin, stirs evenly, is configured to the aqueous solution that epoxy resin mass percent is 20%~38%；Then
Aqueous epoxy resin curing agent is added, stirs evenly, is made aqueous epoxy resins maceration extracts, curing agent and aqueous epoxy resins
Mass ratio is 0.5~1：1.
5. preparation method according to claim 1, it is characterised in that first carry out fibre bundle preimpregnation before fibre bundle dipping
Bubble processing.
6. preparation method according to claim 5, it is characterised in that the pre-soaking processing of the fibre bundle refers to by carbon
Fibre bundle is wrapped on fixed frame, winding process apply 1~10N tension, be subsequently placed in mass percent concentration be 1~
It is impregnated 1~5 minute in 5% phosphoric acid ester adhesion promoter aqueous solution.
7. preparation method according to claim 6, it is characterised in that the phosphoric acid ester adhesion promoter is epoxy
One or several kinds in phosphate, methacrylic acid phosphoric acid ester, 2- hydroxy ethyl methyl acrylated phosphates.
8. preparation method according to claim 1, it is characterised in that the dipping of the fibre bundle is to handle pre-soaking
Fibre bundle afterwards impregnates 1~20 minute together with frame in aqueous epoxy resins maceration extract.
9. preparation method according to claim 1, it is characterised in that the solidification refers to by carbon fibre tow together with frame
Frame from maceration extract take out after stand 1~after five minutes, at a temperature of 90~140 DEG C, baking and curing 1~10 hour.
10. preparation method according to claim 1, it is characterised in that removing for the fibre bundle refers to utilizing scissors
Equal tools remove carbon fibre tow from fixed frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810250707.6A CN108731992A (en) | 2018-03-26 | 2018-03-26 | A kind of preparation method of carbon fiber bundle filament test batten |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810250707.6A CN108731992A (en) | 2018-03-26 | 2018-03-26 | A kind of preparation method of carbon fiber bundle filament test batten |
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| Publication Number | Publication Date |
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| CN108731992A true CN108731992A (en) | 2018-11-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810250707.6A Pending CN108731992A (en) | 2018-03-26 | 2018-03-26 | A kind of preparation method of carbon fiber bundle filament test batten |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111562279A (en) * | 2020-05-11 | 2020-08-21 | 江苏恒神股份有限公司 | Characterization method of skin-core structure of pre-oxidized fiber |
| CN111638112A (en) * | 2020-05-29 | 2020-09-08 | 威海拓展纤维有限公司 | Preparation method of carbon fiber bundle wire test sample strip |
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|---|---|---|---|---|
| CN101736593A (en) * | 2010-01-08 | 2010-06-16 | 哈尔滨工业大学 | Preparation method of water-base epoxy resin sizing agent for carbon fiber |
| CN102809499A (en) * | 2012-08-15 | 2012-12-05 | 中国科学院宁波材料技术与工程研究所 | Sample preparation method for carbon fiber tensile property test |
| CN104120605A (en) * | 2014-07-16 | 2014-10-29 | 哈尔滨工业大学 | Carbon nanotube modified emulsion sizing agent, preparation method and applications thereof |
| CN105043840A (en) * | 2015-09-21 | 2015-11-11 | 核工业理化工程研究院 | Large-tow carbon fiber tensile sample manufacturing method |
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2018
- 2018-03-26 CN CN201810250707.6A patent/CN108731992A/en active Pending
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| CN101736593A (en) * | 2010-01-08 | 2010-06-16 | 哈尔滨工业大学 | Preparation method of water-base epoxy resin sizing agent for carbon fiber |
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| CN104120605A (en) * | 2014-07-16 | 2014-10-29 | 哈尔滨工业大学 | Carbon nanotube modified emulsion sizing agent, preparation method and applications thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111562279A (en) * | 2020-05-11 | 2020-08-21 | 江苏恒神股份有限公司 | Characterization method of skin-core structure of pre-oxidized fiber |
| CN111638112A (en) * | 2020-05-29 | 2020-09-08 | 威海拓展纤维有限公司 | Preparation method of carbon fiber bundle wire test sample strip |
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Application publication date: 20181102 |