CN115014901A - Preparation method of carbon fiber multifilament tensile strength sample - Google Patents
Preparation method of carbon fiber multifilament tensile strength sample Download PDFInfo
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- CN115014901A CN115014901A CN202210724655.8A CN202210724655A CN115014901A CN 115014901 A CN115014901 A CN 115014901A CN 202210724655 A CN202210724655 A CN 202210724655A CN 115014901 A CN115014901 A CN 115014901A
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- 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
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention relates to a preparation method of a tensile strength sample of carbon fiber multifilament, which comprises the following steps: 1) winding the multifilament on a winding frame by using a winding machine; 2) placing a winding frame for winding the multifilament into a glue groove; 3) putting the impregnated winding frame into an oven for curing; 4) cutting the solidified multifilament off from a winding frame; 5) pasting the multifilament sample strip according to the mark on the pasting plate; 6) putting the multifilament sample strips pasted with the reinforcing sheets into an oven for curing; 7) trimming the sample strips after the secondary curing; the sticking board for sticking the reinforcing sheet is a sticking board with a mark specially made according to the test requirement, two ends of the sample strip are placed on the smeared adhesive tape, the sample strip is rotated, another reinforcing sheet which is not glued is arranged on the sample strip, and then a layer of plastic paper is covered on the sample strip. The invention simplifies the sample preparation method of multifilament tensile strength, particularly the pasting process of the reinforcing sheet, and improves the effective breaking rate of the sample strip in the testing process.
Description
Technical Field
The invention relates to a tensile strength test sample of carbon fiber multifilament, in particular to a sample preparation method for testing the tensile strength of the carbon fiber multifilament.
Background
The carbon fiber is a high-performance fiber with the carbon content of more than 95 percent, has excellent performances such as high specific modulus, high specific strength, strong fatigue resistance and the like, is an ideal structural and functional material, and is widely applied to the fields of wind power, aerospace, sports goods, transportation and the like. When the carbon fiber is designed and applied as a structural material, the tensile property of the carbon fiber is usually the core performance index of the design of the carbon fiber. The tensile strength of the carbon fiber multifilament is an important mechanical property index for evaluating the performance of the fiber, sample preparation is mainly divided into mechanical gumming and manual gumming, wherein the mechanical gumming is to firstly dip the multifilament into resin and then wind the multifilament onto a frame, and the manual gumming is to firstly wind the multifilament onto the frame and then dip the multifilament into the resin, and finally the sample spline is prepared through the processes of curing and the like.
The tensile property test of the carbon fiber multifilament belongs to destructive tests, has non-repeatability and is influenced by the stability of a sample, a sample preparation process and a test process, and although the test method is consistent with the test equipment, the test result of the test always has discreteness.
Disclosure of Invention
In order to solve the problems of inconvenient operation and poor stability of the existing sample preparation method, the preparation method of the carbon fiber multifilament tensile strength sample with convenient preparation and high effective breaking rate is provided.
The invention provides a preparation method of a carbon fiber multifilament tensile strength sample, which comprises the following steps:
(1) and (3) putting the multifilament on a shelf: winding the carbon fiber multifilament on a winding frame;
(2) gum dipping: placing the winding frame wound with the multifilament into a glue tank with glue solution, and standing for 2-10 min;
(3) and (3) curing: curing the impregnated winding frame at a certain temperature;
(4) cutting silk: cutting the cured multifilament off from a winding frame to obtain a sample strip with a certain length;
(5) pasting a reinforcing sheet: symmetrically and parallelly arranging first reinforcing sheets on two side edges of the pasting plate, coating glue on the first reinforcing sheets at certain intervals, flatly and straightly placing two ends of a sample strip on a glue coating area of the first reinforcing sheets, rotating the sample strip to enable the sample strip to be fully stained with the glue and ensure that each sample strip is flatly arranged, covering a second reinforcing sheet on the first reinforcing sheets, covering a layer of plastic paper on the second reinforcing sheet, and applying 5-10 KN pressure to the area where the reinforcing sheets are located;
(6) and (3) secondary curing: curing the multi-filament sample strip after applying pressure at a certain temperature;
(7) cutting a sample: and removing the adhesive plate, and trimming the secondary cured multifilament sample strip to obtain the sample strip to be measured.
Further, in the step (1), a winding machine is adopted to apply tension of 1-10 KN, and the carbon fiber multifilament is wound on a winding frame.
Further, in the step (2), the glue solution is epoxy resin, and the glue solution contains epoxy resin, a curing agent and acetone, wherein the mass ratio of the epoxy resin: curing agent = 10: 1, acetone is a solvent, and the proportion is adjustable; the curing agent is an amine.
Further, in the step (5), the glue comprises epoxy resin and a curing agent, and the mass ratio of the epoxy resin: curing agent = 10: and 1, the curing agent is amine.
Further, in the step (3), the winding frame after gum dipping is placed into a 120-135 ℃ blast oven to be cured for 30-70 min.
Further, in the step (5), the pasting plate is made of a composite material plate or a metal alloy plate, and the reinforcing sheet is made of a material with the surface density of 250-600 g/m 2 Kraft paper or chipboard.
Further, in the step (6), the multi-filament sample strip after pressure application is placed into an air-blowing oven at 80-110 ℃ for curing for 90-150 min.
Compared with the prior art, the invention has the advantages that: by adopting the method, the reinforcing sheet pasting process is standardized, on one hand, invalid behaviors such as strip slipping and the like in the test process of the sample can be effectively avoided, and the effective fracture rate of the strip is improved; on the other hand, the perpendicularity of the spline and the reinforcing pieces at the two ends can be guaranteed, and the stability and accuracy of test data are improved.
Drawings
Fig. 1 is a schematic view of a pasting board according to an embodiment of the present invention.
Detailed Description
The present invention will be further explained with reference to examples.
The invention adopts the winding machine and the pasting plate, so that the effect and the stability of carbon fiber winding are improved, and the stability of winding and sample preparation is improved by applying the same tension; secondly, the bonding plate is adopted, so that the verticality of the sample strip is ensured, and the stress deviation during testing is avoided; and thirdly, placing the two ends of the multifilament sample strip on the gluing area of the reinforcing sheet, rotating the sample strip to enable the sample strip to be fully glued, and reducing the invalid fracture rate caused by the falling of the sample strip.
As shown in figure 1, when the reinforcing sheets are arranged on the pasting board, the reinforcing sheets are firstly symmetrically fixed on the designated area of the pasting board, namely two parallel side edges of the pasting board, the pasting board is a composite material board or a metal alloy board, after the reinforcing sheets are arranged in the reinforcing sheet area of the pasting board, epoxy resin glue solution which is uniformly stirred is coated on the reinforcing sheet at certain intervals to form a glue coating area as shown in figure 1, then two ends of a multifilament sample strip are placed on the glue coating area of the reinforcing sheet, the sample strip is rotated to be fully coated with the epoxy resin glue solution, another reinforcing sheet which is not coated with the epoxy resin glue solution is covered on the glued reinforcing sheet, a layer of plastic paper is further covered on the reinforcing sheet, pressure is applied to the area where the reinforcing sheet is located, and the reinforcing sheet can be selected from kraft paper or hard paper.
Example 1:
the tensile strength of a certain domestic T800 carbon fiber multifilament is tested by the following process:
(1) and (4) putting the multifilaments on a shelf, and winding the carbon fiber multifilaments on the winding shelf by applying tension of 5KN by using a winding machine.
(2) Dipping glue, namely putting the resin E44800 g into a baking oven at 50 ℃, drying for 5min, adding acetone for dissolving, adding 80g of curing agent triethylene tetramine, stirring uniformly, and pouring into a glue tank; placing the winding frame for winding the multifilament into a glue tank with glue solution, and standing for 4 min; excess glue on the multifilament yarn was drained.
(3) Curing, namely putting the winding frame subjected to draining and gum dipping into a 120 ℃ blast oven for curing for 40 min;
(4) and (3) cutting filaments, cutting the cured multifilament off from a winding frame in sequence, selecting uniform sample strips without broken filaments, wherein the length of the sample strips is 30cm, and using the sample strips for sticking reinforcing sheets.
(5) Attaching reinforcing sheets, and adding 2 reinforcing sheets (kraft paper, all 50mm 1000mm in size, and 300g/m in surface density) 2 ) Symmetrically fixing the two parallel sides of a sticking plate (adopting a metal alloy plate, the size is 250mm x 500 mm), taking resin E44300 g, adding 30g of curing agent triethylene tetramine, uniformly stirring to prepare epoxy resin glue, coating the epoxy resin glue on a reinforcing sheet at certain intervals, wherein the coated glue is in a glue strip shape, placing two ends of a sample strip on a reinforcing sheet gluing area (glue strip), rotating the sample strip to enable the sample strip to be fully stained with the epoxy resin glue, covering the reinforcing sheet which is not coated with the glue on the reinforcing sheet which is coated with the glue, covering a layer of plastic paper on the reinforcing sheet, and applying 6KN pressure to the reinforcing sheet area.
(6) And (4) secondary curing, namely placing the multifilament sample strips pasted with the reinforcing sheets into a blowing oven at 80 ℃ for curing for 120 min.
(7) And cutting the sample, removing the adhesive plate after the secondary curing is finished, trimming the sample strips exposed at two sides of the kraft paper by using scissors to be flat, and cutting to obtain one sample strip.
(8) And testing, namely performing tensile test on the sample strip by using a universal tensile machine.
In this example, 10 groups of carbon fiber multifilaments were tested to have a tensile strength of 6014MPa, a CV of 2.7%, and an effective breaking rate of the sample strips of 94.4%.
Example 2:
the tensile strength of a certain domestic T700 carbon fiber multifilament is tested by the following process:
(1) and (4) putting the carbon fiber multifilament on a frame, and applying tension of 6KN by using a winding machine to wind the carbon fiber multifilament on the winding frame.
(2) Dipping glue, namely putting the resin E44900 g into a 50 ℃ oven, drying for 6min, adding acetone for dissolution, adding 90g of curing agent triethylene tetramine, stirring uniformly, and pouring into a glue tank; placing the winding frame for winding the multifilament into a glue tank with glue solution, and standing for 5 min; excess glue on the multifilament yarn was drained.
(3) Curing, namely putting the drained and impregnated winding frame into a 130 ℃ blast oven to be cured for 50 min;
(4) and (3) cutting filaments, cutting the cured multifilament off from a winding frame in sequence, selecting uniform sample strips without broken filaments, wherein the length of the sample strips is more than 25cm, and the sample strips are used for sticking reinforcing sheets.
(5) Attaching reinforcing sheets, and adding 2 reinforcing sheets (kraft paper, all 50mm 1000mm in size, and 300g/m in surface density) 2 ) Symmetrically fixing the two sides of a sticking plate (adopting a metal alloy plate, the size is 250mm x 500 mm), taking resin E44350 g, adding 35g of curing agent triethylene tetramine, uniformly stirring to prepare epoxy resin glue, coating the epoxy resin glue on a reinforcing sheet at a certain interval, wherein the coated glue is in a glue strip shape, placing two ends of a sample strip on a glue coating area (glue strip) of the reinforcing sheet, rotating the sample strip to enable the sample strip to be fully coated with the epoxy resin glue, covering the reinforcing sheet which is not coated with the glue on the reinforced sheet which is coated with the glue, covering a layer of plastic paper on the reinforced sheet, and applying 5KN pressure to the area of the reinforcing sheet.
(6) And (4) secondary curing, namely placing the multifilament sample strips pasted with the reinforcing sheets into a blast oven at 100 ℃ for curing for 120 min.
(7) And cutting the sample, removing the adhesive plate after the secondary curing is finished, trimming the sample strips exposed at two sides of the kraft paper by using scissors to be flat, and cutting to obtain one sample strip.
(8) And testing, namely performing tensile test on the sample strip by using a universal tensile machine.
In this example, 10 groups of carbon fiber multifilaments were tested to have a tensile strength of 5174MPa, a CV of 2.6%, and an effective breaking rate of 100% for the sample strips.
Example 3:
the tensile strength of a certain domestic T800 carbon fiber multifilament is tested by the following process:
the other steps were the same as in example 1, except that in the step (5), the areal density of the reinforcing sheet was 250 g/m 2 。
In this example, 10 groups of carbon fiber multifilaments were tested to have a tensile strength of 5958MPa, a CV of 3.1%, and an effective breaking rate of 90% for the sample strips.
Example 4:
the tensile strength of a certain domestic T800 carbon fiber multifilament is tested by the following process:
the other steps were the same as in example 1, except that in the step (5), the areal density of the reinforcing sheet was 600g/m 2 。
In this example, 10 groups of carbon fiber multifilaments were tested to have a tensile strength of 6042MPa, a CV of 2.6%, and an effective breaking rate of 95.3% for the sample strips.
Comparative example 1:
the tensile strength of a certain domestic T800 carbon fiber multifilament is tested by the following process:
the other steps were the same as in example 1, except that in the step (5), the areal density of the reinforcing sheet was 200g/m 2 。
In this comparative example, 10 groups of carbon fiber multifilaments were tested to have a tensile strength of 5762MPa, a CV of 5.3%, and an effective breaking rate of the sample strips of 78.4%.
In the above embodiment, in order to increase the reliability of the tensile property test result of the multifilament, the present invention simplifies the operation steps, optimizes the reinforcing sheet attaching process, and improves the effective breaking rate of the sample strip during the test process.
Claims (8)
1. A method for preparing a tensile strength test sample of carbon fiber multifilament is characterized by comprising the following steps:
(1) and (3) putting the multifilament on a shelf: winding the carbon fiber multifilament on a winding frame;
(2) gum dipping: placing the winding frame wound with the multifilament into a glue tank with glue solution, and standing for 2-10 min;
(3) and (3) curing: curing the impregnated winding frame at a certain temperature;
(4) cutting silk: cutting the cured multifilament off from a winding frame to obtain a sample strip with a certain length;
(5) pasting a reinforcing sheet: symmetrically and parallelly arranging first reinforcing sheets on two side edges of the pasting plate, coating glue on the first reinforcing sheets at certain intervals, flatly and straightly placing two ends of a sample strip on a glue coating area of the first reinforcing sheets, rotating the sample strip to enable the sample strip to be fully stained with the glue and ensure that each sample strip is flatly arranged, covering a second reinforcing sheet on the first reinforcing sheets, covering a layer of plastic paper on the second reinforcing sheet, and applying 5-10 KN pressure to the area where the reinforcing sheets are located;
(6) secondary curing: curing the multi-filament sample strip after applying pressure at a certain temperature;
(7) cutting a sample: and removing the adhesive plate, and trimming the secondary cured multifilament sample strip to obtain the sample strip to be measured.
2. The method according to claim 1, wherein in the step (1), the carbon fiber multifilament yarn is wound on the winding frame by applying a tension of 1 to 10KN by using a winding machine.
3. The method according to claim 1, wherein in the step (2), the glue solution comprises epoxy resin, a curing agent and acetone, wherein the mass ratio of the epoxy resin: curing agent = 10: and 1, the curing agent is amine.
4. The method according to claim 1, wherein in the step (5), the glue comprises an epoxy resin and a curing agent, and the mass ratio of the epoxy resin: curing agent = 10: and 1, the curing agent is amine.
5. The method according to claim 1, wherein in the step (3), the winding frame after gum dipping is placed in a 120-135 ℃ blast air oven for curing for 30-70 min.
6. The method according to claim 1, wherein in the step (5), the adhesive sheet is a composite material sheet or a metal alloy sheet, and the reinforcing sheet has an areal density of 250 to 600g/m 2 Kraft paper or chipboard.
7. The method according to claim 1, wherein in the step (6), the multi-filament sample after the pressure is applied is placed in a blowing oven at 80-110 ℃ for curing for 90-150 min.
8. A carbon fiber multifilament tensile strength specimen prepared according to the process of any one of claims 1-7.
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| CN202210724655.8A CN115014901A (en) | 2022-06-24 | 2022-06-24 | Preparation method of carbon fiber multifilament tensile strength sample |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117367919A (en) * | 2023-12-04 | 2024-01-09 | 北京玻钢院复合材料有限公司 | Carbon fiber multifilament tensile property test sample and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117367919A (en) * | 2023-12-04 | 2024-01-09 | 北京玻钢院复合材料有限公司 | Carbon fiber multifilament tensile property test sample and manufacturing method thereof |
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