CN112048151A - Resin composition for preparing aramid composite core by pultrusion process - Google Patents
Resin composition for preparing aramid composite core by pultrusion process Download PDFInfo
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- CN112048151A CN112048151A CN202010722795.2A CN202010722795A CN112048151A CN 112048151 A CN112048151 A CN 112048151A CN 202010722795 A CN202010722795 A CN 202010722795A CN 112048151 A CN112048151 A CN 112048151A
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- 238000000034 method Methods 0.000 title claims abstract description 45
- 239000002131 composite material Substances 0.000 title claims abstract description 25
- 229920003235 aromatic polyamide Polymers 0.000 title claims abstract description 24
- 239000004760 aramid Substances 0.000 title claims abstract description 23
- 239000011342 resin composition Substances 0.000 title claims abstract description 21
- 239000003822 epoxy resin Substances 0.000 claims abstract description 55
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 53
- 229920006231 aramid fiber Polymers 0.000 claims abstract description 43
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 39
- 239000000835 fiber Substances 0.000 claims description 21
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 12
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 12
- 238000002360 preparation method Methods 0.000 claims description 9
- 150000001412 amines Chemical class 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 5
- 125000003055 glycidyl group Chemical group C(C1CO1)* 0.000 claims description 4
- 150000008065 acid anhydrides Chemical class 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- VILCJCGEZXAXTO-UHFFFAOYSA-N 2,2,2-tetramine Chemical group NCCNCCNCCN VILCJCGEZXAXTO-UHFFFAOYSA-N 0.000 claims description 2
- 239000004593 Epoxy Substances 0.000 claims description 2
- LGRFSURHDFAFJT-UHFFFAOYSA-N Phthalic anhydride Natural products C1=CC=C2C(=O)OC(=O)C2=C1 LGRFSURHDFAFJT-UHFFFAOYSA-N 0.000 claims description 2
- FDLQZKYLHJJBHD-UHFFFAOYSA-N [3-(aminomethyl)phenyl]methanamine Chemical compound NCC1=CC=CC(CN)=C1 FDLQZKYLHJJBHD-UHFFFAOYSA-N 0.000 claims description 2
- -1 alicyclic glycidyl ester Chemical class 0.000 claims description 2
- JHIWVOJDXOSYLW-UHFFFAOYSA-N butyl 2,2-difluorocyclopropane-1-carboxylate Chemical group CCCCOC(=O)C1CC1(F)F JHIWVOJDXOSYLW-UHFFFAOYSA-N 0.000 claims description 2
- 238000001704 evaporation Methods 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims description 2
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 229960001124 trientine Drugs 0.000 claims description 2
- 238000005406 washing Methods 0.000 claims description 2
- 229920005989 resin Polymers 0.000 abstract description 48
- 239000011347 resin Substances 0.000 abstract description 48
- 238000002715 modification method Methods 0.000 abstract description 7
- 239000000203 mixture Substances 0.000 abstract description 6
- 238000005452 bending Methods 0.000 abstract description 2
- 150000008064 anhydrides Chemical class 0.000 description 14
- 239000007788 liquid Substances 0.000 description 14
- 239000003365 glass fiber Substances 0.000 description 10
- 239000003292 glue Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 238000002474 experimental method Methods 0.000 description 5
- 229920000049 Carbon (fiber) Polymers 0.000 description 4
- 239000004917 carbon fiber Substances 0.000 description 4
- 239000003085 diluting agent Substances 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- CSHJJWDAZSZQBT-UHFFFAOYSA-N 7a-methyl-4,5-dihydro-3ah-2-benzofuran-1,3-dione Chemical group C1=CCCC2C(=O)OC(=O)C21C CSHJJWDAZSZQBT-UHFFFAOYSA-N 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 3
- 239000006082 mold release agent Substances 0.000 description 3
- 238000011417 postcuring Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 2
- 238000007598 dipping method Methods 0.000 description 2
- 239000003733 fiber-reinforced composite Substances 0.000 description 2
- 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 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000013307 optical fiber Substances 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 229920006337 unsaturated polyester resin Polymers 0.000 description 2
- 229920001567 vinyl ester resin Polymers 0.000 description 2
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 125000003700 epoxy group Chemical group 0.000 description 1
- 238000001879 gelation Methods 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000000967 suction filtration Methods 0.000 description 1
- 229920006305 unsaturated polyester Polymers 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
-
- 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
- C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
- C08J5/046—Reinforcing macromolecular compounds with loose or coherent fibrous material with synthetic macromolecular fibrous material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/50—Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC]
- B29C70/52—Pultrusion, i.e. forming and compressing by continuously pulling through a die
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/50—Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC]
- B29C70/52—Pultrusion, i.e. forming and compressing by continuously pulling through a die
- B29C70/521—Pultrusion, i.e. forming and compressing by continuously pulling through a die and impregnating the reinforcement before the die
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
- C08G59/42—Polycarboxylic acids; Anhydrides, halides or low molecular weight esters thereof
- C08G59/4223—Polycarboxylic acids; Anhydrides, halides or low molecular weight esters thereof aromatic
-
- 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
- C08J2477/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
- C08J2477/10—Polyamides derived from aromatically bound amino and carboxyl groups of amino carboxylic acids or of polyamines and polycarboxylic acids
Abstract
The invention belongs to the technical field of resin modified compositions, and particularly relates to a resin composition suitable for an aramid composite core and a modification method. The invention provides a resin composition for preparing a high-performance aramid composite core by a pultrusion process, which comprises the following components in percentage by weight: multifunctional epoxy resin, curing agent and nano aramid fiber. According to the invention, the high-temperature epoxy resin is modified mainly according to the surface properties of the aramid fiber, so that the bonding capability between the aramid fiber and the resin can be improved, the heat resistance and the toughness of the resin are improved, and the bending resistance of the composite core is improved.
Description
Technical Field
The invention belongs to the technical field of resin modified compositions, and particularly relates to a resin composition suitable for an aramid composite core and a modification method.
Background
The pultrusion process requires that the matrix resin has the characteristics of long applicable period, short gelation time, high curing speed and the like. The matrix resin suitable for pultrusion of the composite material mainly comprises epoxy resin and unsaturated polyester. The low viscosity and the long working life are the necessary conditions for the resin to meet the continuous large-scale production requirement of pultrusion products, and the fast reaction speed is the natural requirement of the pultrusion process and meets the requirement of fast molding. The high temperature resistance and toughness are that the pultruded composite core meets the requirements of high-temperature environment use and better bending performance and construction performance. At present, the more applied resin is epoxy resin which is mainly used for carbon fibers and glass fibers, but the applied aramid fibers are fewer, and the surface bonding performance between the epoxy resin and the aramid fibers is poor, so that the use of the epoxy resin is influenced. The resin developed by aiming at the aramid fiber can meet the better wetting property with the aramid fiber and has better heat resistance and toughness.
Patent document 1 discloses a high temperature resistant epoxy resin composition for rapid pultrusion and a preparation method thereof. The epoxy resin composition comprises epoxy resin, an amine curing agent, a latent curing agent, a compound of a low-molecular epoxy group and an inorganic filler, and the prepared high-temperature epoxy resin can be rapidly cured in a short time. The method has the advantages of economy, environmental protection, controllable reaction and great industrial application value.
Patent document 2 discloses a pultrusion method and apparatus for producing a fiber-reinforced composite material, which employs a simple epoxy resin system and a mixed system of a resin, a curing agent, and a mold release agent, and produces a sample having a low resin content although the method is easy to operate.
Patent document 3 discloses a matrix resin composition of a resin-based fiber-reinforced composite mandrel for an overhead conductor and a patent application of a method for using the same, and the main technical scheme is to mix and use epoxy resin, a curing agent and an accelerator, and soak the epoxy resin, the curing agent and the accelerator with fibers.
The commonly used pultrusion resin is unsaturated polyester resin and vinyl ester resin, and the resin material has the problems of low heat resistance and poor interface performance. The epoxy resin has excellent performance, but for general epoxy resin, the viscosity of a resin system taking amines as a curing agent is higher, the performance can be greatly reduced after a diluent is added, the resin taking liquid anhydride as the curing agent is often cured at high temperature for a long time, and the epoxy resin has certain limitation when being used in a pultrusion process. The invention relates to a resin modification method for preparing a high-performance aramid composite core by a pultrusion process. Pultrusion is a method of making high performance, low cost continuous composite materials.
Documents of the prior art
Patent document
Patent document 1: CN 201110183270.7
Patent document 2: CN 109016565A
Patent document 3: CN 102604328A
Disclosure of Invention
Technical problem to be solved by the invention
The invention aims to solve the problems of low heat resistance and poor interface performance of the commonly used resin for pultrusion.
Means for solving the technical problem
Aiming at the problems, the invention provides a resin composition for preparing a high-performance aramid composite core by a pultrusion process and a modification method of the composition.
According to one embodiment of the present invention, there is provided a resin composition for use in a pultrusion process for producing a high-performance aramid composite core, comprising: multifunctional epoxy resin, curing agent and nano aramid fiber.
In one embodiment, the curing agent is selected from anhydrides or amines.
In one embodiment, the aramid fiber is para-aramid, meta-aramid, or III-aramid fiber.
In one embodiment, the multifunctional epoxy resins are high temperature resistant epoxy resins.
In one embodiment, the mass fraction of the nano-aramid fiber in the resin composition is 0.05% to 5%.
In one embodiment, the multifunctional epoxy-condensed resin is a glycidyl ether-amine type epoxy resin, a cycloaliphatic glycidyl ester type epoxy).
In one embodiment, the acid anhydride curing agent is selected from phthalic anhydride and maleic anhydride, and the amine curing agent is selected from triethylene tetramine, m-xylylenediamine, m-phenylethylamine, and the like.
In one embodiment, the glycidyl ether-amine epoxy resin is 1-glycidyl ether, 4-diglycidylamine epoxy resin.
According to a second aspect of the present invention, there is provided a method for preparing a resin composition for preparing a high-performance aramid composite core in a pultrusion process, comprising: the nano aramid fiber is prepared by cutting high-orientation aromatic fibers such as para-aramid fiber, meta-aramid fiber, aramid fiber III, PBO, M5 and the like, dissolving the cut fibers in a DMSO/KOH solution, wherein the mass fraction of the fibers is 0.1-0.6%, filtering, washing with water for multiple times, drying in vacuum, dispersing the nano-aramid fiber in acetone, mixing with multifunctional epoxy resin, and evaporating the acetone solution to remove the acetone solution.
The invention has the advantages of
The invention relates to a resin modification method for preparing a high-performance aramid composite core by a pultrusion process. Pultrusion is a method of making high performance, low cost continuous composite materials. The commonly used pultrusion resin is unsaturated polyester resin and vinyl ester resin, and the resin material has the problems of low heat resistance and poor interface performance. The epoxy resin has excellent performance, but for general epoxy resin, the viscosity of a resin system taking amines as a curing agent is higher, the performance can be greatly reduced after a diluent is added, the resin taking liquid anhydride as the curing agent is often cured at high temperature for a long time, and the epoxy resin has certain limitation when being used in a pultrusion process. The invention uses aModified multifunctional epoxy resinsThe curing characteristic of the resin is utilized, and the resin is matched with liquid anhydride to carry out pultrusion process, so that the resin system has good pultrusion performance.
Further features of the present invention will become apparent from the following description of exemplary embodiments.
Detailed Description
One embodiment of the present disclosure will be specifically described below, but the present disclosure is not limited thereto.
The invention uses aModified multifunctional epoxy resinsThe curing characteristic of the resin is utilized, and the resin is matched with liquid anhydride to carry out pultrusion process, so that the resin system has good pultrusion performance. The invention relates to a resin modification method for preparing a high-performance aramid composite core by a pultrusion process. The epoxy resin is adopted to prepare the composite material, but for the general epoxy resin, the viscosity of a resin system taking amine as a curing agent is higher, the performance can be greatly reduced after a diluent is added, and the resin taking liquid anhydride as the curing agent is often cured at high temperature for a long time.
The invention aims to provide a resin modification method for preparing a high-performance aramid composite core by a pultrusion process, which solves the problems of low heat resistance and poor interface performance of the commonly used resin for pultrusion while improving the mechanical property of fiber and endows a resin system with good pultrusion performance.
The main structure of a single product prepared by the invention is as follows: aramid fiber and epoxy resin are compositely formed into a sample (wherein the epoxy resin is obtained by modifying nano aramid fiber) prepared from the aramid fiber, which is adopted by the invention, through a pultrusion process, and the sample can be used as a supporting material of a cable core.
As a preferred technical scheme:
according to the resin composition for preparing the aramid composite core by the pultrusion process, the epoxy resin used in the experiment is selected from the commercially available epoxy resin and a curing agent, the accelerator is selected from liquid anhydride, and the volume ratio of the resin: curing agent: releasing agent: accelerator 10:10:1: 1.
The method is characterized in that the epoxy resin, the curing agent and the accelerator are uniformly mixed, vacuum defoamed and injected into a standard sample mold, and the mixture is heated and cured in an oven according to the conditions of 80 ℃ for 1h +120 ℃ for 2h +150 ℃ for 2h to prepare a casting body for testing mechanical properties.
In the above-described method, the resin system and the internal mold release agent are mixed with each other and poured into the glue tank.
In the method, the pultrusion mould adopts a three-section stepped heating mould, and the temperature ranges from 200 ℃ to 300 ℃. .
In the method described above, the resin system used to wet the fibers and the internal mold release agent are mixed with each other and poured into the glue bath.
The method as described above, wherein the volume ratio of fiber to resin during pultrusion is 3: 2. .
In the above method, the speed of the drawing was set to 8 cm/min. According to the method, the aramid fiber is subjected to surface cleaning, specifically, the aramid fiber is placed in an acetone or toluene solvent, soaked and heated to 80-100 ℃ for 2-4 hours, taken out and dried in vacuum.
Examples
The present invention is described in more detail by way of examples, but the present invention is not limited to the following examples.
The preparation of the nano aramid fiber comprises the following operations:
(1) preparing 1g aramid fiber small sections by using an ultrafine shearing machine;
(2)500ml of DMSO solution, 1.5g of KOH and 1g of aramid fiber are mixed and stirred, and are placed for a week;
(3) taking a certain amount of ANFs/DMSO solution, and performing suction filtration for 3-4 times by using deionized water to obtain nano aramid fibers (ANFs);
(4) drying in an oven at 80 deg.C for 1-2 h.
Example 1
A pultrusion preparation method of a glass fiber belt coated aramid fiber stranded wire comprises the following steps:
(1) in the experiment, commercially available high-temperature-resistant epoxy resin is selected, the corresponding curing agent is modified methyl tetrahydrophthalic anhydride, and the mass ratio of the resin: curing agent: releasing agent: liquid anhydride 10:10:1: 1.
(2) Selecting a die with a die orifice diameter of 2.5mm, respectively preparing pultrusion samples, setting the speed of a tractor to be 8cm/min, and setting the curing temperature of three sections to be 240 ℃, 250 ℃ and 240 ℃;
(3) carrying out a secondary pultrusion process on the sample obtained by primary pultrusion, twisting seven pultruded samples into a fried dough twist sample through a rotary die, wherein the three-section curing temperature is 180 ℃, 190 ℃ and 180 ℃;
(4) during twisting, two glass fiber belts are introduced at the position of a die inlet and on two sides of the die inlet so as to be coated around a twisted sample;
(5) and collecting a finished product after molding. The surface appearance of the sample is greatly improved, the surface is smooth, the solidification is complete, and no obvious gully or yarn shedding phenomenon is found.
Example 2
A preparation process of a cable composite core comprises the following steps:
preparing epoxy resin and pre-dipping liquid before pultrusion, selecting commercially available epoxy resin (added with nano modified fiber) and curing agent, wherein the resin: curing agent: releasing agent: liquid anhydride 10:10:1: 1; the aramid fiber passes through a presoaking groove to be presoaked; the fiber passes through a glue groove and is glued; curing in a mold at three stages at 260 deg.C, 270 deg.C and 260 deg.C; taking out the mold, passing through a tunnel type oven, performing post-curing treatment, respectively winding the prepared samples on different coils, and collecting; and (3) carrying out a secondary pultrusion process on the prepared sample, changing the inner wall of the die into a rotary type, passing one product through the central bundling hole without heating, uniformly distributing the four optical fiber products in the four bundling holes around the central bundling hole, simultaneously drawing in a rubber layer to coat the four optical fiber products, and rotating to obtain the cable composite core.
Example 3
A method for preparing a cable core supporting material based on a pultrusion process comprises the following steps:
(1) selecting epoxy resin for preparation, and matching with a proper amount of liquid anhydride;
(2) the fiber passes through a glue groove and is glued; curing in a mold in three stages at 180 deg.C, 190 deg.C, 180 deg.C, and pultrusion speed of 10 cm/min;
(3) then, taking out the die, passing through a tunnel type drying oven, carrying out post-curing treatment, preparing four groups of samples according to the method, and respectively winding the prepared samples on different coils;
(4) the four prepared samples are subjected to a secondary pultrusion process, the inner wall of the die is changed into a rotary type, one product passes through the central bundling hole, the other products are uniformly distributed in six bundling holes around the central bundling hole, are pre-soaked through a pre-soaking groove and enter a glue groove, and are soaked through the die with a rotating device on the inner wall, and an aramid fiber belt is pulled in the position of a die inlet and is coated around the stranded wire, so that the surface performance is improved.
Example 4
A composite pultrusion preparation process of glass fiber and carbon fiber comprises the following steps:
preparing epoxy resin and a pre-dipping solution before pultrusion, selecting the epoxy resin and a curing agent, wherein the resin is as follows: curing agent: releasing agent: liquid anhydride 10:10:1: 1; and (3) allowing the fiber to pass through a prepreg tank for prepreg treatment, wherein the volume ratio of epoxy resin: diluent 1: 3; the fiber passes through a glue groove and is glued; entering a die to be solidified in three sections, wherein the temperature is respectively set to be 240 ℃, 250 ℃ and 240 ℃; the carbon fiber is placed in the middle, and both sides are glass fiber, get into the mould solidification, go out the mould afterwards, through tunnel formula oven, the postcure is handled, twines the sample that makes respectively on different coils, collects from this and has obtained compound core.
Example 5
A pultrusion preparation method of a glass fiber belt coated aramid fiber comprises the following steps:
(1) the experiment selects high-temperature-resistant epoxy resin, and the corresponding curing agent is modified methyl tetrahydrophthalic anhydride which is prepared from the following resins in percentage by mass: curing agent: releasing agent: liquid anhydride 10:10:1: 1.
(2) Selecting a die with a die orifice diameter of 6.5mm, setting the speed of a tractor to be 8cm/min, and setting the three-section curing temperature to be 180 ℃, 190 ℃ and 180 ℃;
(3) introducing two glass fiber belts at two sides of a die inlet so as to wrap the glass fiber belts around the twisted sample;
(5) and collecting a finished product after molding.
Example 6
A pultrusion process for aramid fiber supporting materials of cable cores comprises the following steps:
(1) selecting the diameter of a die opening to be 2.5 mm;
(2) preparing commercially available epoxy resin and liquid anhydride;
(3) the fiber passes through a glue groove and is glued; curing in a mold in three stages at 180 deg.C, 190 deg.C, 180 deg.C, and pultrusion speed of 5 cm/min;
(4) then, taking out the die, passing through a tunnel type drying oven, carrying out post-curing treatment, preparing four groups of samples according to the method, and respectively winding the prepared samples on different coils;
(5) the four prepared samples are subjected to a secondary pultrusion process, the inner wall of the die is changed into a rotary type, one product passes through the central bundling hole, the other products are uniformly distributed in six bundling holes around the central bundling hole, are pre-soaked through a pre-soaking groove and enter a glue groove, and are soaked through the die with a rotating device on the inner wall, and an aramid fiber belt is pulled in the position of a die inlet and is coated around the stranded wire, so that the surface performance is improved.
Example 7
A pultrusion preparation method of a glass fiber belt coated aramid stranded wire is a comparative experiment of example 1, modified nano aramid fibers are not added into resin, and the method comprises the following steps:
(1) in the experiment, commercially available high-temperature-resistant epoxy resin is selected, and the corresponding curing agent is modified methyl tetrahydrophthalic anhydride which is prepared from the following resins in percentage by mass: curing agent: releasing agent: liquid anhydride 10:10:1: 1.
(2) Selecting a die with a die orifice diameter of 2.5mm, respectively preparing pultrusion samples, setting the speed of a tractor to be 8cm/min, and setting the curing temperature of three sections to be 240 ℃, 250 ℃ and 240 ℃;
(3) carrying out a secondary pultrusion process on the sample obtained by primary pultrusion, twisting seven pultruded samples into a fried dough twist sample through a rotary die, wherein the three-section curing temperature is 180 ℃, 190 ℃ and 180 ℃;
(4) during twisting, two glass fiber belts are introduced at the position of a die inlet and on two sides of the die inlet so as to be coated around a twisted sample;
(5) and collecting a finished product after molding. By observing the surface appearance of the sample, the sample has poor curing effect and obvious gully and yarn shedding phenomena on the surface.
Industrial applicability
The main structure of a single product prepared by the invention is as follows: aramid fiber and epoxy resin are compounded through a pultrusion process to form a sample made of the aramid fiber, the sample can be used as a supporting material of a cable core, compared with a traditional method of using carbon fiber to prepare a composite core, the bonding force between the epoxy resin and the fiber is improved, the safety coefficient is greatly improved, the reliability and the safety of an intelligent power grid and a power supply line are improved, and the occurrence of sudden accidents caused by natural disasters is effectively reduced.
The present invention is not limited to the above embodiments, and any changes or substitutions that can be easily made by those skilled in the art within the technical scope of the present invention are also within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A resin composition for preparing a high-performance aramid composite core by a pultrusion process is characterized by comprising the following components in parts by weight: multifunctional epoxy resin, curing agent and modified nano aramid fiber.
2. The resin composition according to claim 1, wherein the curing agent is selected from an acid anhydride or an amine.
3. The resin composition of claim 1, wherein the nano-aramid fiber is a para-aramid, meta-aramid, aramid III fiber.
4. The resin composition according to claim 1, wherein the multifunctional epoxy resin is a high temperature resistant epoxy resin.
5. The resin composition according to claim 1, wherein the mass fraction of the nano-aramid fiber in the resin composition is 0.05 to 5%.
6. The resin composition according to claim 4, wherein the polyfunctional epoxy resin comprises one of glycidyl ether-amine type epoxy resin and alicyclic glycidyl ester type epoxy.
7. The resin composition according to claim 2, wherein the acid anhydride curing agent is selected from phthalic anhydride and maleic anhydride, and the amine curing agent is selected from triethylene tetramine, m-xylylenediamine and m-phenylethylamine.
8. The resin composition according to claim 6, wherein the glycidyl ether-amine epoxy resin is 1-glycidyl ether, 4-diglycidylamine epoxy resin.
9. A preparation method of a resin composition for preparing a high-performance aramid composite core by a pultrusion process is characterized by comprising the following steps of: the nano aramid fiber is prepared by using one or more of para-aramid fiber, meta-aramid fiber, aramid fiber III, PBO and M5 and dissolving the para-aramid fiber, the meta-aramid fiber, the aramid fiber III, the PBO and the M5 in a DMSO/KOH solution after being cut short, wherein the mass fraction of the fiber is 0.1-0.6%, then filtering and washing the fiber for multiple times by using water, drying the fiber in vacuum, dispersing the nano-aramid fiber in acetone, mixing the nano-aramid fiber with multifunctional epoxy resin, and evaporating and removing the acetone solution.
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