CN117621429A - Synergistic surface treatment method for improving cementing property of carbon fiber composite material - Google Patents
Synergistic surface treatment method for improving cementing property of carbon fiber composite material Download PDFInfo
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- CN117621429A CN117621429A CN202311561071.4A CN202311561071A CN117621429A CN 117621429 A CN117621429 A CN 117621429A CN 202311561071 A CN202311561071 A CN 202311561071A CN 117621429 A CN117621429 A CN 117621429A
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- cloth
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- 239000002131 composite material Substances 0.000 title claims abstract description 86
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 59
- 229920000049 Carbon (fiber) Polymers 0.000 title claims abstract description 57
- 239000004917 carbon fiber Substances 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000004381 surface treatment Methods 0.000 title claims abstract description 24
- 230000002195 synergetic effect Effects 0.000 title claims abstract description 18
- 239000004744 fabric Substances 0.000 claims abstract description 44
- 239000002313 adhesive film Substances 0.000 claims abstract description 23
- 239000003822 epoxy resin Substances 0.000 claims abstract description 16
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 16
- 125000000524 functional group Chemical group 0.000 claims abstract description 13
- 238000009832 plasma treatment Methods 0.000 claims abstract description 11
- 239000000835 fiber Substances 0.000 claims description 10
- 229920000728 polyester Polymers 0.000 claims description 9
- 239000004952 Polyamide Substances 0.000 claims description 7
- 229920002647 polyamide Polymers 0.000 claims description 7
- 230000003746 surface roughness Effects 0.000 claims description 7
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 6
- 239000003365 glass fiber Substances 0.000 claims description 6
- 125000003545 alkoxy group Chemical group 0.000 claims description 5
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 claims description 5
- 229920006332 epoxy adhesive Polymers 0.000 claims description 4
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 4
- 238000000465 moulding Methods 0.000 claims description 4
- 229920002302 Nylon 6,6 Polymers 0.000 claims description 3
- 238000010382 chemical cross-linking Methods 0.000 abstract description 5
- 230000008569 process Effects 0.000 description 10
- 238000004026 adhesive bonding Methods 0.000 description 8
- 239000000853 adhesive Substances 0.000 description 6
- 230000001070 adhesive effect Effects 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000004321 preservation Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000004593 Epoxy Substances 0.000 description 2
- 239000004902 Softening Agent Substances 0.000 description 2
- 238000007718 adhesive strength test Methods 0.000 description 2
- 150000004982 aromatic amines Chemical class 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000012744 reinforcing agent Substances 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000007306 functionalization reaction Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Landscapes
- Chemical Or Physical Treatment Of Fibers (AREA)
- Laminated Bodies (AREA)
Abstract
The invention discloses a synergistic surface treatment method for improving the cementing property of a carbon fiber composite material, and belongs to the field of composite material surface engineering. The method comprises the following steps: s1, when preparing a carbon fiber composite material, preparing the roughness of the carbon fiber composite material through concave-convex patterns on the surface of a strippable cloth or a stripping cloth; s2, carrying out normal-pressure normal-temperature atmospheric plasma treatment on the carbon fiber composite material obtained in the step S1, so that active functional groups are introduced into the surface of the carbon fiber composite material; and S3, bonding the carbon fiber composite materials obtained in the step S2 through adhesive films. The method can increase the number of polar groups on the surface of the composite material and improve the chemical crosslinking between the surface of the composite material and the adhesive film. The single lap joint strength of the carbon fiber reinforced epoxy resin composite material after treatment is improved by more than 80 percent compared with that before treatment.
Description
Technical Field
The invention belongs to the field of composite material surface engineering, and particularly relates to a synergistic surface treatment method for improving the cementing property of a carbon fiber composite material.
Background
Cementing is one method of joining composite structural members. During the bonding process, some polymeric material (adhesive) is used to bond two separate parts (bonded parts). The method can partially or completely eliminate the cost and weight increase caused by mechanical fasteners; the stress distribution of the glue joint is more uniform than a mechanical fastener connection because there is no stress concentration zone caused by the mechanical fastener.
Proper surface treatment is critical to achieve a strong and durable bond. Conventional surface treatment methods generally perform hand polishing, sand blasting, etc. on the surface of the composite material, so as to improve the surface roughness of the composite material. However, the method has poor process stability and serious pollution, and the fiber is easily damaged to cause strength loss. And the degree of improving the strength is limited only by increasing the surface roughness, and the bonding strength can be improved by introducing chemical crosslinking reaction.
Therefore, in order to overcome the defects, the invention provides a synergistic surface treatment method for improving the bonding strength of a composite material. The surface roughness of the composite material can be accurately controlled by using the strippable cloth or the demolding cloth in the curing and forming process of the composite material, and the experimental repeatability is high. Secondly, active groups are introduced into the rough surface of the composite material by utilizing a plasma technology, so that the composite material is favorable for chemical combination with the adhesive, and the adhesive bonding strength of the composite material is further improved.
Disclosure of Invention
The invention aims to solve the technical problem of providing a synergistic surface treatment method for improving the cementing property of a carbon fiber composite material aiming at the defects in the prior art. The method aims at improving the cementing performance of the composite material by introducing physical mechanical occlusion through coating strippable cloth or release cloth on the surface in the preparation process of the carbon fiber composite material, then introducing active groups on the surface through plasma treatment, and increasing the chemical crosslinking of the composite material and the chemical adhesive.
The specific technical scheme adopted by the invention is as follows:
the invention provides a synergistic surface treatment method for improving the cementing property of a carbon fiber composite material, which comprises the following steps:
s1, when preparing a carbon fiber composite material, preparing the roughness of the carbon fiber composite material through concave-convex patterns on the surface of a strippable cloth or a stripping cloth;
s2, carrying out normal-pressure normal-temperature atmospheric plasma treatment on the carbon fiber composite material obtained in the step S1, so that active functional groups are introduced into the surface of the carbon fiber composite material;
and S3, bonding the carbon fiber composite materials obtained in the step S2 through adhesive films.
Preferably, the step S1 specifically includes the following steps:
and paving the strippable cloth or the demolding cloth with the patterns on the upper surface and the lower surface of the composite material preform, curing in an autoclave according to a curing system of the prepreg, performing hot press molding, taking out, demolding, and tearing the strippable cloth or the demolding cloth to prepare the surface roughness of the carbon fiber composite material.
Further, the prepreg is a medium-temperature cured epoxy resin carbon fiber prepreg or a high-temperature cured epoxy resin carbon fiber prepreg.
Preferably, the strippable cloth is a polyester, polyamide or glass fiber fabric, and the stripping cloth is woven from nylon 66 or polyester fibers.
Preferably, the plasma processing parameters are as follows:
the nozzle distance was 12mm, the equipment power was 800w, and the processing speed was 15mm/s.
Preferably, the reactive functional groups include alkoxy, carbonyl, carboxyl and hydroxyl groups.
Preferably, the adhesive film is an epoxy adhesive film containing support fibers.
Further, the support fibers include polyester, polyamide, and glass fibers.
Preferably, in the step S3, the bonding is to perform hot press molding in an autoclave according to the curing system of the adhesive film used, and the two carbon fiber composite materials are tightly bonded.
Compared with the prior art, the invention has the following beneficial effects:
in the invention, the concave-convex patterns of the strippable cloth and the release cloth can form a rough surface with high regularity and repeatability on the composite material, and the grooves and the pits provide more bonding sites, so that the interfacial adhesion is increased; the plasma treatment introduces active functional groups such as alkoxy, carbonyl, carboxyl and the like, and enhances the molecular adsorption capacity and wettability of the surface of the adhesive, thereby improving the bonding strength. The method of combining mechanical interlocking and chemical functionalization can be used for effectively manufacturing the composite material joint with excellent mechanical properties.
Drawings
FIG. 1 is a schematic illustration of the surface roughness of a carbon fiber reinforced epoxy composite material made using a strippable or release cloth;
fig. 2 is a schematic diagram of the plasma surface treatment of the carbon fiber reinforced epoxy resin composite.
Fig. 3 is a graph showing the change of the contact angle of the surface of the carbon fiber composite material before and after plasma treatment.
Fig. 4 is a graph of stress-strain curves of carbon fiber composites before and after co-surface treatment.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a synergistic surface treatment method for improving the cementing property of a carbon fiber composite material, which comprises the following steps:
s1, when the carbon fiber composite material is prepared, the roughness of the carbon fiber composite material is prepared through concave-convex patterns on the surface of the strippable cloth or the stripping cloth.
As a preferred embodiment of the present invention, this step may specifically be performed by the following method:
and (3) paving the strippable cloth or the demolding cloth with the patterns on the upper surface and the lower surface of the composite material preform, curing and hot-press forming in an autoclave according to the curing system of the prepreg (namely the resin standard curing system), taking out, demolding, tearing the strippable cloth or the demolding cloth, and thus preparing the surface roughness of the carbon fiber composite material.
In practical application, the prepreg can be a medium-temperature cured epoxy resin carbon fiber prepreg or a high-temperature cured epoxy resin carbon fiber prepreg. The strippable cloth can be made of polyester, polyamide or glass fiber fabrics, the stripping cloth is woven from polyamide (nylon 66) or polyester fibers through a certain production process, and certain roughness of the surfaces of the strippable cloth and the stripping cloth is required to be ensured.
S2, carrying out normal-pressure normal-temperature atmospheric plasma treatment on the carbon fiber composite material obtained in the step S1, so that active functional groups are introduced into the surface of the carbon fiber composite material.
As a preferred embodiment of the invention, the plasma treatment parameters can be adjusted to obtain surface active groups on the surface of the treated composite material. For example, it may be set to: the nozzle distance was 12mm, the equipment power was 800w, and the processing speed was 15mm/s. The surface active groups obtained after treatment refer to functional groups such as C= O, O-C=O, and can generate chemical crosslinking reaction with the adhesive film. For example, active functional groups such as alkoxy, carbonyl and carboxyl can improve the surface energy, enhance the wettability of the surface to glue, and generate chemical reaction with the glue film in the secondary gluing process, thereby further improving the gluing strength.
And S3, bonding the carbon fiber composite materials obtained in the step S2 through adhesive films.
As a preferred embodiment of the invention, the gluing is to carry out hot press molding in an autoclave according to the curing system of the adhesive film used, and the two carbon fiber composite materials are tightly glued.
In practice, the film is an epoxy film containing support fibers (common fiber types include polyester, polyamide and glass fibers). The adhesive film can also comprise a high-temperature resistant aromatic amine type or catalytic curing agent, and the optional range of the reinforcing and softening agent shared by the high-temperature resistant aromatic amine type or catalytic curing agent and the reinforcing and softening agent is wide.
The method and effect of the present invention will be further illustrated by the following examples.
Example 1
In the embodiment, the carbon fiber reinforced epoxy resin composite material is subjected to surface treatment and adhesive strength test, the prepreg of the composite material is a medium-temperature cured epoxy resin prepreg (USN 15000), the strippable cloth is a Release Ply B, and the adhesive film is a modified epoxy adhesive film (AF 191K), and the specific treatment process is as follows:
firstly, the strippable cloth with patterns is paved on the upper surface and the lower surface of the composite material preformed body, and is cured in an autoclave according to the curing system of USN15000 prepreg (heat preservation at 120 ℃ for 2 h). The surface of the composite material after being taken out and demoulded can obtain the same pattern as the strippable cloth after being heated and pressurized in the forming process, so that the mechanical interlocking effect of the composite material and the adhesive (adhesive film) is enhanced, as shown in figure 1. And then carrying out plasma treatment on the obtained composite material sample, wherein the distance between plasma nozzles is 12mm, the power of equipment is 800w, and the treatment speed is 15mm/s. The surface of the treated composite material can obtain active functional groups such as alkoxy, hydroxyl, carbonyl, carboxyl and the like (shown in figure 2), the surface energy is increased, the contact angle is reduced (shown in figure 3), and the active functional groups and the AF191K adhesive film react chemically in the adhesive bonding (heat preservation at 177 ℃ for 1 h) process, so that the adhesive bonding strength is further improved. The single lap joint strength of the carbon fiber reinforced epoxy resin composite material after treatment is improved by more than 80 percent compared with that before treatment.
Example two
In the embodiment, the carbon fiber reinforced epoxy resin composite material is subjected to surface treatment and adhesive strength test, the prepreg of the composite material is toughened high-temperature cured epoxy resin prepreg (IM 7/M91), the strippable cloth is (Release Ply B), the adhesive film is an epoxy adhesive film (AF 191K), and the specific treatment process is as follows:
firstly, laying strippable cloth with patterns on the upper surface and the lower surface of a composite material preformed body, and curing in an autoclave according to a curing system (heat preservation at 180 ℃ for 2 h) of toughening high-temperature curing epoxy resin prepreg. The surface of the composite material after being taken out and demoulded can obtain the same pattern as the strippable cloth after being heated and pressurized in the forming process, so that the mechanical interlocking effect of the composite material and the adhesive (adhesive film) is enhanced, as shown in figure 1. And then carrying out plasma treatment on the obtained composite material sample, wherein the distance of a plasma nozzle is 12mm, the power of equipment is 800w, the treatment speed is 15mm/s, active functional groups such as hydroxyl, carboxyl and the like (shown in figure 2) can be obtained on the surface of the treated composite material, and the active functional groups and the AF191K adhesive film generate chemical reaction in the adhesive bonding (heat preservation at 177 ℃ for 1 h) process, so that the adhesive bonding strength is further improved. The single lap strength of the carbon fiber reinforced epoxy resin composite material after the synergistic surface treatment is improved by more than 80% compared with that before the treatment, as shown in figure 4.
The method can increase the number of polar groups on the surface of the composite material and improve the chemical crosslinking between the surface of the composite material and the adhesive film. The single lap joint strength of the carbon fiber reinforced epoxy resin composite material after treatment is improved by more than 80 percent compared with that before treatment.
The above embodiment is only a preferred embodiment of the present invention, but it is not intended to limit the present invention. Various changes and modifications may be made by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present invention. Therefore, all the technical schemes obtained by adopting the equivalent substitution or equivalent transformation are within the protection scope of the invention.
Claims (9)
1. A synergistic surface treatment method for improving the cementing property of a carbon fiber composite material is characterized by comprising the following steps:
s1, when preparing a carbon fiber composite material, preparing the roughness of the carbon fiber composite material through concave-convex patterns on the surface of a strippable cloth or a stripping cloth;
s2, carrying out normal-pressure normal-temperature atmospheric plasma treatment on the carbon fiber composite material obtained in the step S1, so that active functional groups are introduced into the surface of the carbon fiber composite material;
and S3, bonding the carbon fiber composite materials obtained in the step S2 through adhesive films.
2. The synergistic surface treatment method for improving the cementing property of a carbon fiber composite material according to claim 1, wherein the step S1 is specifically as follows:
and paving the strippable cloth or the demolding cloth with the patterns on the upper surface and the lower surface of the composite material preform, curing in an autoclave according to a curing system of the prepreg, performing hot press molding, taking out, demolding, and tearing the strippable cloth or the demolding cloth to prepare the surface roughness of the carbon fiber composite material.
3. The synergistic surface treatment method for improving the cementing property of a carbon fiber composite material according to claim 2, wherein the prepreg is a medium-temperature cured epoxy resin carbon fiber prepreg or a high-temperature cured epoxy resin carbon fiber prepreg.
4. The synergistic surface treatment method for improving the cementing property of a carbon fiber composite material according to claim 1, wherein the strippable cloth is a polyester, polyamide or glass fiber fabric, and the release cloth is woven from nylon 66 or polyester fiber.
5. The synergistic surface treatment method for improving the cementing property of a carbon fiber composite material according to claim 1, wherein the plasma treatment parameters are as follows:
the nozzle distance was 12mm, the equipment power was 800w, and the processing speed was 15mm/s.
6. A synergistic surface treatment method for improving the cementing properties of carbon fiber composites as claimed in claim 1, wherein the reactive functional groups comprise alkoxy groups, carbonyl groups, carboxyl groups and hydroxyl groups.
7. The synergistic surface treatment method for improving the cementing property of a carbon fiber composite material as claimed in claim 1, wherein the adhesive film is an epoxy adhesive film containing supporting fibers.
8. The synergistic surface treatment method for improving the cementing properties of carbon fiber composite materials as claimed in claim 7, wherein the supporting fibers comprise polyester, polyamide and glass fibers.
9. The synergistic surface treatment method for improving the cementing performance of the carbon fiber composite material according to claim 1, wherein in the step S3, the cementing is performed by hot press forming in an autoclave according to the curing system of the adhesive film used, and two carbon fiber composite materials are tightly cemented.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311561071.4A CN117621429A (en) | 2023-11-22 | 2023-11-22 | Synergistic surface treatment method for improving cementing property of carbon fiber composite material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311561071.4A CN117621429A (en) | 2023-11-22 | 2023-11-22 | Synergistic surface treatment method for improving cementing property of carbon fiber composite material |
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| Publication Number | Publication Date |
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| CN117621429A true CN117621429A (en) | 2024-03-01 |
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|---|---|---|---|
| CN202311561071.4A Pending CN117621429A (en) | 2023-11-22 | 2023-11-22 | Synergistic surface treatment method for improving cementing property of carbon fiber composite material |
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| Country | Link |
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| CN (1) | CN117621429A (en) |
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- 2023-11-22 CN CN202311561071.4A patent/CN117621429A/en active Pending
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