CN117924765A - Hydrophobic OoA prepreg, laminated board and preparation method of laminated board - Google Patents
Hydrophobic OoA prepreg, laminated board and preparation method of laminated board Download PDFInfo
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- 230000002209 hydrophobic effect Effects 0.000 title claims abstract description 58
- 238000002360 preparation method Methods 0.000 title abstract description 22
- 239000000203 mixture Substances 0.000 claims abstract description 32
- 229920005989 resin Polymers 0.000 claims abstract description 29
- 239000011347 resin Substances 0.000 claims abstract description 29
- 239000004744 fabric Substances 0.000 claims abstract description 24
- 238000005470 impregnation Methods 0.000 claims abstract description 20
- 239000003292 glue Substances 0.000 claims abstract description 18
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 17
- 239000000835 fiber Substances 0.000 claims abstract description 17
- 238000013329 compounding Methods 0.000 claims abstract description 15
- 239000000843 powder Substances 0.000 claims abstract description 13
- 239000012943 hotmelt Substances 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims description 37
- 239000002313 adhesive film Substances 0.000 claims description 7
- QGBSISYHAICWAH-UHFFFAOYSA-N dicyandiamide Chemical compound NC(N)=NC#N QGBSISYHAICWAH-UHFFFAOYSA-N 0.000 claims description 6
- 239000003365 glass fiber Substances 0.000 claims description 6
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 5
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 5
- 239000003822 epoxy resin Substances 0.000 claims description 4
- 229920000647 polyepoxide Polymers 0.000 claims description 4
- -1 polytetrafluoroethylene Polymers 0.000 claims description 4
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 3
- 239000004202 carbamide Substances 0.000 claims description 3
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims 1
- 229910052799 carbon Inorganic materials 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 19
- 238000010521 absorption reaction Methods 0.000 abstract description 7
- 238000000465 moulding Methods 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 12
- 238000001816 cooling Methods 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000005096 rolling process Methods 0.000 description 8
- 238000003756 stirring Methods 0.000 description 8
- 239000002131 composite material Substances 0.000 description 7
- 238000005520 cutting process Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- OIWXLVBZDMAARO-UHFFFAOYSA-N 2-decylsulfanylethanamine Chemical compound CCCCCCCCCCSCCN OIWXLVBZDMAARO-UHFFFAOYSA-N 0.000 description 4
- 238000004026 adhesive bonding Methods 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 3
- LCFVJGUPQDGYKZ-UHFFFAOYSA-N Bisphenol A diglycidyl ether Chemical compound C=1C=C(OCC2OC2)C=CC=1C(C)(C)C(C=C1)=CC=C1OCC1CO1 LCFVJGUPQDGYKZ-UHFFFAOYSA-N 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000005661 hydrophobic surface Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 230000003075 superhydrophobic effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/24—Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs
- C08J5/241—Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs using inorganic fibres
- C08J5/244—Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs using inorganic fibres using glass fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/38—Layered products comprising a layer of synthetic resin comprising epoxy resins
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2363/00—Characterised by the use of epoxy resins; Derivatives of epoxy resins
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2427/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
- C08J2427/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
- C08J2427/12—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C08J2427/18—Homopolymers or copolymers of tetrafluoroethylene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
- C08K7/14—Glass
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Reinforced Plastic Materials (AREA)
Abstract
The application discloses a hydrophobic OoA prepreg, a laminated board and a preparation method, which belong to the technical field of prepregs, and the preparation method of the hydrophobic OoA prepreg comprises the following steps: uniformly mixing resin, a curing agent 2, an accelerator and hydrophobic powder, and then adding the curing agent 1 into the mixture, and uniformly mixing to prepare a resin mixture; and preparing the resin mixture into a glue film, and then compounding the glue film and the fiber fabric in a hot melt impregnation mode to prepare the hydrophobic OoA prepreg. The preparation method of the laminated board comprises the following steps: layering hydrophobic OoA prepreg, bagging, and solidifying and molding; the prepreg has strong hydrophobicity, low humidity requirement on the preparation environment and low internal porosity in the preparation process, and can effectively solve the problems of strong water absorption, high porosity and the like of the existing prepreg.
Description
Technical Field
The invention belongs to the technical field of prepregs, and particularly relates to a hydrophobic OoA prepreg, a laminated board and a preparation method thereof.
Background
Wettability is one of the important properties of solid surfaces, which is mainly determined by the composition and geometry of the surface. The Contact Angle (CA) of a liquid on a solid surface is a physical parameter for measuring wettability of the solid surface, and is generally represented by θ, and the wettability behavior of the solid surface is classified into hydrophilic (θ <90 °), hydrophobic (θ >90 °) and superhydrophobic (θ >150 °) according to the magnitude of θ. Many hydrophobic examples are found in nature, such as: lotus leaves which are not dyed after silt is discharged, rice leaves and water-strides walking on the water surface. Through research on the hydrophobic surface in nature, the following is found: the wettability of the material surface is related to the free energy of the material surface composition substances and the geometric structure of the material surface, and the hydrophilic and hydrophobic states of the material surface can be changed by adjusting the structure of the material surface or the low-surface energy substances so as to meet the use requirements of different environments.
The designability and the integral formability of the composite material lead the composite material to be widely applied to the fields of unmanned aerial vehicles, aerospace, wind power generation and the like, and the research and the application of a non-autoclave (OoA) process are increasingly wide along with the increasingly urgent requirement of composite material structural parts for low-cost manufacture; compared with the traditional autoclave molding process, the OoA prepreg molding process has the obvious advantages of low equipment price, low process energy consumption, high equipment utilization rate, low requirements on die materials and processing and the like, and is considered to be the most likely composite material low-cost manufacturing technology realized in a large scale.
Prepregs are compositions of resin matrix and reinforcement made of resin matrix impregnated with fibres or fabrics under tightly controlled conditions, and are intermediate materials for the manufacture of composite materials whose properties are directly incorporated into the composite material, which is the basis of the composite material, the properties of which depend to a large extent on the properties of the prepreg. The epoxy resin-based OoA prepreg is easy to absorb moisture in the air in the preparation, cutting and layering processes of the prepreg due to the hydrophilicity of the resin, so that the performance of the prepreg is reduced; during oven curing, moisture in the hygroscopic prepreg is difficult to escape, and voids are formed, thereby affecting the quality of the product. Thus, the preparation of OoA prepregs with moisture resistance plays an important role in the development and application of cured articles of art outside the autoclave.
At present, the control means for increasing the porosity of the product caused by moisture absorption of OoA prepreg mainly focuses on the following two aspects, firstly, the moisture absorption degree of the prepreg is reduced by controlling the storage condition, cutting and layering humidity of the prepreg, but the method has high requirements on the production and subsequent treatment of the prepreg, and an accurate evaluation method for the moisture absorption degree of the prepreg is lacking, so that the product yield is not guaranteed, and the fault tolerance rate is low; secondly, the curing process is adjusted, and the moisture discharge speed is increased by keeping the temperature at a fixed temperature for a certain time, but the method has different requirements on different types of resin, and the process exploration process is complex, and is time-consuming and labor-consuming.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the hydrophobic OoA prepreg, the laminated board and the preparation method, wherein the prepreg is strong in hydrophobicity, low in humidity requirement on the preparation environment and low in internal porosity in the preparation process, and the problems of strong water absorption, high porosity and the like of the existing prepreg can be effectively solved.
In order to achieve the above purpose, the technical scheme adopted by the invention for solving the technical problems is as follows:
a method of preparing a hydrophobic OoA prepreg comprising the steps of:
(1) Uniformly mixing resin, a curing agent 2, an accelerator and hydrophobic powder, and then adding the curing agent 1 into the mixture, and uniformly mixing to prepare a resin mixture;
(2) And preparing the resin mixture into a glue film, and then compounding the glue film and the fiber fabric in a hot melt impregnation mode to prepare the hydrophobic OoA prepreg.
Further, in the step (1), the mass ratio of the resin to the curing agent 1 to the curing agent 2 to the accelerator is 100:1.8-10:2-3.5:1.5.
Further, the amount of the hydrophobic powder in the step (1) is 5-25% of the mass of the resin mixture.
Further, in the step (1), the resin is difunctional epoxy resin, the curing agent 2 is dicyandiamide, the accelerator is organic urea, the hydrophobic powder is polytetrafluoroethylene powder, and the curing agent 1 is an aliphatic amine curing agent.
Further, the film forming temperature of the adhesive film in the step (2) is 65-90 ℃.
Further, the surface density of the adhesive film in the step (2) is 80-85g/cm 2.
Further, the fibers in the step (2) are glass fiber fabrics or carbon fiber fabrics.
Further, the hot melting temperature of the hot melting impregnation mode in the step (2) is 35-60 ℃, and the presoaking pressure is 0.05-0.2Mpa.
Further, the impregnation mode in the step (2) is single-sided impregnation, and the resin content is 40-55%.
A hydrophobic OoA prepreg is prepared by the method.
A laminate comprising the hydrophobic OoA prepreg described above.
The preparation method of the laminated board comprises the following steps: and (3) layering the hydrophobic OoA prepreg, bagging, and then curing and forming to obtain the finished product.
Further, the laminate curing temperature is 110-180 ℃.
The beneficial effects of the invention are as follows:
1. According to the invention, polytetrafluoroethylene powder hydrophobic powder is used as a filler to be added into a resin matrix formula, so that the problem of water absorption of the prepreg is solved from the source, extra working hours and working procedures are not added, and the preparation method is convenient to operate and easy for large-scale preparation.
2. According to the method, the preparation of the hydrophobic prepreg is completed in a two-step hot-melt impregnation mode, new equipment is not needed, the operation is simple, the water contact angle of the prepreg is larger than 125 ℃, the prepreg is stored in environments with different humidity, the water contact angle is not obviously reduced, the hydrophobic performance is stable, the limit requirements on the environment humidity in the prepreg storage, cutting and layering processes can be obviously reduced, the quality of an oven cured product can be effectively improved, and the application range of OoA prepregs is enlarged; meanwhile, the laminated board prepared by the prepreg is excellent in appearance, the porosity is lower than 1%, the mechanical property is stable, and the application of OoA products in a load-bearing structural member can be improved; in addition, the laminated board also has excellent hydrophobic performance, the water contact angle is more than 150 ℃, the condition that the performance of the product fails due to moisture absorption can be effectively improved, the preparation process of an additional coating is reduced, the energy consumption and time are saved, and the laminated board can be widely applied to various fields such as unmanned aerial vehicles, aerospace, wind power generation and the like.
Drawings
FIG. 1 is a graph showing the contact angle between a prepreg and water in the examples;
FIG. 2 is a graph showing the contact angle between the laminate and water in the embodiment;
FIG. 3 is a schematic view of a prepreg according to an embodiment;
FIG. 4 is a graph showing the contact angle between the prepreg and water in comparative example 1;
FIG. 5 is a graph showing the contact angle between the laminate and water in comparative example 1;
FIG. 6 is a view of the prepreg of comparative example 1.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the particular embodiments described herein are illustrative only and are not intended to limit the invention, i.e., the embodiments described are merely some, but not all, of the embodiments of the invention.
Thus, the following detailed description of the embodiments of the invention, as provided, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.
It is noted that relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.
The features and capabilities of the present invention are described in further detail below with reference to the examples and figures.
Example 1
A hydrophobic OoA prepreg, the method of preparation comprising the steps of:
(1) 728.5g of difunctional epoxy resin DGEBA, 16.1g of dicyandiamide, 10.9g of organic urea Dyhard UR200 and 78.7g of polytetrafluoroethylene powder PTFE are uniformly mixed, 25.6g of fatty amine curing agent DTEA is added into the mixture, stirring is carried out for 15min at the rotating speed of 200r/min, the rotating speed is increased to 500r/min, stirring is carried out for 20min, and the resin mixture is prepared;
(2) Uniformly coating the resin mixture on release paper, then preparing a glue film by gluing and rolling, wherein the film forming temperature is 70 ℃, cooling and rolling to prepare the glue film, and the surface density of the glue film is 81g/cm 2; then compounding the adhesive film and the fiber fabric in a hot melt impregnation mode to prepare hydrophobic OoA prepreg; wherein, the fiber fabric is glass fiber plain weave fabric, the surface density of the fiber fabric is 100g/m 2, the single-sided impregnation mode is adopted for compounding, the compounding temperature is 40 ℃, and the impregnation pressure is 0.1Mpa.
A laminate, the method of making comprising the steps of: cutting the hydrophobic OoA prepreg into a predetermined size, layering and bagging according to the requirement, then treating for 3 hours at 130 ℃, cooling, solidifying and forming to obtain the finished product.
Example 2
A hydrophobic OoA prepreg, the method of preparation comprising the steps of:
(1) Mixing 728.5gDGEBA, 25.6g dicyandiamide, 10.9g Dyhard UR200 and 118.1 and gPTFE uniformly, then adding 16.1 and g DTEA into the mixture, stirring the mixture for 15min at a rotating speed of 200r/min, increasing the rotating speed to 500r/min, stirring the mixture for 20min, and uniformly mixing the mixture to obtain a resin mixture;
(2) Uniformly coating the resin mixture on release paper, then preparing a glue film by gluing and rolling, wherein the film forming temperature is 70 ℃, cooling and rolling to prepare the glue film, and the surface density of the glue film is 81g/cm 2; then compounding the adhesive film and the fiber fabric in a hot melt impregnation mode to prepare hydrophobic OoA prepreg; wherein, the fiber fabric is glass fiber plain weave fabric, the surface density of the fiber fabric is 100g/m 2, the single-sided impregnation mode is adopted for compounding, the compounding temperature is 40 ℃, and the impregnation pressure is 0.1Mpa.
A laminate, the method of making comprising the steps of: cutting the hydrophobic OoA prepreg into a predetermined size, layering and bagging according to the requirement, then treating for 3 hours at 130 ℃, cooling, solidifying and forming to obtain the finished product.
Example 3
A hydrophobic OoA prepreg, the method of preparation comprising the steps of:
(1) 728.3g of DGEBA, 21.9g of dicyandiamide, 10.9g Dyhard UR200 and 78.7. 78.7gPTFE are uniformly mixed, 23.3g DTEA is added into the mixture, stirring is carried out for 15min at a rotating speed of 200r/min, the rotating speed is increased to 500r/min, stirring is carried out for 20min, and the resin mixture is prepared;
(2) Uniformly coating the resin mixture on release paper, then preparing a glue film by gluing and rolling, wherein the film forming temperature is 70 ℃, cooling and rolling to prepare the glue film, and the surface density of the glue film is 81g/cm 2; then compounding the adhesive film and the fiber fabric in a hot melt impregnation mode to prepare hydrophobic OoA prepreg; wherein, the fiber fabric is glass fiber plain weave fabric, the surface density of the fiber fabric is 100g/m 2, the single-sided impregnation mode is adopted for compounding, the compounding temperature is 40 ℃, and the impregnation pressure is 0.1Mpa.
A laminate, the method of making comprising the steps of: cutting the hydrophobic OoA prepreg into a predetermined size, layering and bagging according to the requirement, then treating for 3 hours at 130 ℃, cooling, solidifying and forming to obtain the finished product.
Example 4
A hydrophobic OoA prepreg, the method of preparation comprising the steps of:
(1) Mixing 728.8gDGEBA, 19.7g dicyandiamide, 10.9g Dyhard UR200 and 78.7. 78.7gPTFE uniformly, then adding 27.6g DTEA into the mixture, stirring the mixture for 15min at a rotating speed of 200r/min, increasing the rotating speed to 500r/min, stirring the mixture for 20min, and uniformly mixing the mixture to obtain a resin mixture;
(2) Uniformly coating the resin mixture on release paper, then preparing a glue film by gluing and rolling, wherein the film forming temperature is 70 ℃, cooling and rolling to prepare the glue film, and the surface density of the glue film is 81g/cm 2; then compounding the adhesive film and the fiber fabric in a hot melt impregnation mode to prepare hydrophobic OoA prepreg; wherein, the fiber fabric is glass fiber plain weave fabric, the surface density of the fiber fabric is 100g/m 2, the single-sided impregnation mode is adopted for compounding, the compounding temperature is 40 ℃, and the impregnation pressure is 0.1Mpa.
A laminate, the method of making comprising the steps of: cutting the hydrophobic OoA prepreg into a predetermined size, layering and bagging according to the requirement, then treating for 3 hours at 130 ℃, cooling, solidifying and forming to obtain the finished product.
Comparative example 1
The addition of hydrophobic powder was omitted on the basis of example 1.
Experimental example
The water contact angles of the hydrophobic OoA prepregs and laminates prepared in examples 1 to 4 and comparative example 1, respectively, were measured, and the specific measurement results are shown in table 1 and fig. 1 to 6; the porosity of the laminates was then determined by ultrasonic testing and the mechanical properties of the laminates were determined and the specific results are shown in table 2.
Table 1: water contact angle measurement result
As can be seen from the results in the above table, the prepregs and laminates prepared by the methods of examples 1 to 4 all have a large water contact angle, whereas the prepregs and laminates of comparative example 1 have a small water contact angle, demonstrating that the prepregs and laminates prepared by the methods of the application have a good hydrophobic effect.
Table 2: measurement of porosity and mechanical Properties
As can be seen from the results in the above table, the laminates prepared by the methods of examples 1 to 4 all had smaller porosities, and had larger tensile strength, tensile modulus, and interlaminar shear strength, while the laminate of comparative example 1 had increased porosities, and decreased tensile strength, tensile modulus, and interlaminar shear strength, demonstrating that the mechanical properties of the laminate of comparative example 1 were deteriorated.
Taking the hydrophobic OoA prepregs in example 1 and comparative example 1 as an example, the prepared hydrophobic OoA prepreg was subjected to pretreatment under 80% RH humidity for 2 hours, and then laminates were prepared using the treated hydrophobic OoA prepreg, water contact angles of the hydrophobic OoA prepreg and the laminates before and after the treatment were measured, respectively, and porosity and mechanical properties of the laminates were measured, and specific results are shown in tables 3 to 4.
Table 3: water contact angle measurement result
As can be seen from the results of table 3, the prepregs subjected to the high humidity environment treatment in example 1 and comparative example 1 showed little change in water contact angle as compared with the prepregs before treatment; the water contact angle of the laminate also does not vary much.
Table 4: measurement of porosity and mechanical Properties
As can be seen from the results in Table 4, the prepregs subjected to the high humidity treatment in example 1 had slightly increased porosity compared with the prepregs before the treatment, and the mechanical properties of the resulting laminates were not greatly changed from those of the laminates before the treatment; compared with the prepreg before treatment, the prepreg subjected to the high-humidity environment treatment in the comparative example 1 has larger porosity increment range, and the mechanical property of the prepared laminated board also has larger change, so that the prepreg in the comparative example 1 has larger hydrophobic property, is more sensitive to moisture in the environment and can directly influence the performance of the laminated board.
Claims (10)
1. A method of preparing a hydrophobic OoA prepreg comprising the steps of:
(1) Uniformly mixing resin, a curing agent 2, an accelerator and hydrophobic powder, and then adding the curing agent 1 into the mixture, and uniformly mixing to prepare a resin mixture;
(2) And preparing the resin mixture into a glue film, and then compounding the glue film and the fiber fabric in a hot melt impregnation mode to prepare the hydrophobic OoA prepreg.
2. The method of preparing a hydrophobic OoA prepreg according to claim 1, wherein the mass ratio of resin, curing agent 1, curing agent 2 and accelerator in step (1) is 100:1.8-10:2-3.5:1.5.
3. The method of preparing a hydrophobic OoA prepreg according to claim 1, wherein the amount of hydrophobic powder used in step (1) is 5-25% by mass of the resin mixture.
4. The method of preparing a hydrophobic OoA prepreg according to claim 1, wherein in step (1) the resin is a difunctional epoxy resin, the curing agent 2 is dicyandiamide, the accelerator is an organic urea, the hydrophobic powder is polytetrafluoroethylene powder, and the curing agent 1 is an aliphatic amine curing agent.
5. The method of preparing a hydrophobic OoA prepreg according to claim 1 wherein the adhesive film in step (2) has an areal density of 80-85g/cm 2.
6. The method of preparing a hydrophobic OoA prepreg according to claim 1 wherein the fibres in step (2) are glass fibre fabrics or carbon fibre fabrics.
7. The method for preparing a hydrophobic OoA prepreg according to claim 1, wherein the hot-melt impregnation mode in the step (2) has a hot-melt temperature of 35-60 ℃ and a prepreg pressure of 0.05-0.2Mpa.
8. A hydrophobic OoA prepreg, characterised in that it is produced by a process as claimed in any one of claims 1 to 7.
9. A laminate comprising the hydrophobic OoA prepreg of claim 8.
10. A method of producing a laminate as claimed in claim 9, comprising the steps of: and (3) layering the hydrophobic OoA prepreg, bagging, and then curing and forming to obtain the finished product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410108328.9A CN117924765A (en) | 2024-01-25 | 2024-01-25 | Hydrophobic OoA prepreg, laminated board and preparation method of laminated board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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