CN114957741A - Novel low-temperature co-curing high-damping composite material and preparation method thereof - Google Patents
Novel low-temperature co-curing high-damping composite material and preparation method thereof Download PDFInfo
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- 238000013016 damping Methods 0.000 title claims abstract description 52
- 239000002131 composite material Substances 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000004744 fabric Substances 0.000 claims abstract description 47
- 239000003822 epoxy resin Substances 0.000 claims abstract description 43
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 43
- 239000000835 fiber Substances 0.000 claims abstract description 41
- 239000003190 viscoelastic substance Substances 0.000 claims abstract description 34
- 239000000203 mixture Substances 0.000 claims abstract description 33
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 24
- -1 mercapto compound Chemical class 0.000 claims abstract description 16
- 239000002184 metal Substances 0.000 claims abstract description 16
- 230000001680 brushing effect Effects 0.000 claims abstract description 15
- 238000005520 cutting process Methods 0.000 claims abstract description 11
- 229920001971 elastomer Polymers 0.000 claims abstract description 11
- 238000007731 hot pressing Methods 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 238000005507 spraying Methods 0.000 claims abstract description 6
- 230000008569 process Effects 0.000 claims description 9
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 8
- 229920002379 silicone rubber Polymers 0.000 claims description 7
- 229920002554 vinyl polymer Polymers 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000004945 silicone rubber Substances 0.000 claims description 6
- 239000004593 Epoxy Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 239000004850 liquid epoxy resins (LERs) Substances 0.000 claims description 5
- 238000002791 soaking Methods 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 4
- 229910018557 Si O Inorganic materials 0.000 claims description 2
- 125000001931 aliphatic group Chemical group 0.000 claims description 2
- 230000001588 bifunctional effect Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000006116 polymerization reaction Methods 0.000 claims description 2
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Inorganic materials [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 claims description 2
- 125000003396 thiol group Chemical group [H]S* 0.000 claims description 2
- 230000032683 aging Effects 0.000 abstract description 5
- 239000000463 material Substances 0.000 description 14
- 239000010410 layer Substances 0.000 description 12
- 229920000049 Carbon (fiber) Polymers 0.000 description 10
- 239000004917 carbon fiber Substances 0.000 description 10
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 10
- 238000012360 testing method Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- RNLHGQLZWXBQNY-UHFFFAOYSA-N 3-(aminomethyl)-3,5,5-trimethylcyclohexan-1-amine Chemical group CC1(C)CC(N)CC(C)(CN)C1 RNLHGQLZWXBQNY-UHFFFAOYSA-N 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 125000000524 functional group Chemical group 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- IMQFZQVZKBIPCQ-UHFFFAOYSA-N 2,2-bis(3-sulfanylpropanoyloxymethyl)butyl 3-sulfanylpropanoate Chemical compound SCCC(=O)OCC(CC)(COC(=O)CCS)COC(=O)CCS IMQFZQVZKBIPCQ-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010382 chemical cross-linking Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 125000003700 epoxy group Chemical group 0.000 description 1
- 239000003733 fiber-reinforced composite Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
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- 238000000465 moulding Methods 0.000 description 1
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- 238000011160 research Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
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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
- C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
- C08J5/0405—Reinforcing macromolecular compounds with loose or coherent fibrous material with inorganic fibres
- C08J5/042—Reinforcing macromolecular compounds with loose or coherent fibrous material with inorganic fibres with carbon fibres
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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
- C08J2363/00—Characterised by the use of epoxy resins; Derivatives of epoxy resins
- C08J2363/02—Polyglycidyl ethers of bis-phenols
-
- 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
- C08J2383/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
- C08J2383/04—Polysiloxanes
- C08J2383/07—Polysiloxanes containing silicon bound to unsaturated aliphatic groups
-
- 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
- C08J2463/00—Characterised by the use of epoxy resins; Derivatives of epoxy resins
- C08J2463/02—Polyglycidyl ethers of bis-phenols
-
- 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
- C08J2483/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
- C08J2483/04—Polysiloxanes
- C08J2483/07—Polysiloxanes containing silicon bound to unsaturated aliphatic groups
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Abstract
The invention discloses a novel low-temperature co-curing high-damping composite material and a preparation method thereof. The preparation method comprises the following steps: (1) mixing rubber and a mercapto compound to obtain a viscoelastic material; (2) cutting the fiber cloth into required size, and brushing the viscoelastic material prepared in the step (1) on two sides of the fiber cloth by adopting a double-side brushing method to prepare prepreg fiber cloth with the viscoelastic material brushed on two sides; (3) preparing prepreg fiber cloth containing epoxy resin mixture; (4) and (3) spraying a release agent on the metal template, sequentially laying the prepreg fiber cloth with the viscoelastic material coated on the two sides prepared in the step (2) and the prepreg fiber cloth containing the epoxy resin mixture prepared in the step (3) on the lower metal template, and performing hot-pressing curing to obtain the low-temperature co-cured high-damping composite material. The composite material prepared by the invention has the advantages of no falling, aging resistance, high damping and the like.
Description
Technical Field
The invention relates to the technical field of material preparation, in particular to a novel low-temperature co-curing high-damping composite material and a preparation method thereof.
Background
The resin-based fiber reinforced composite material has the characteristics of light weight, high specific strength, large specific stiffness, aging resistance, excellent damping property and the like, and is widely applied to the fields of aerospace, rail transit, sports products and the like in recent years. With the development of equipment such as aerospace, rail transit, sports goods and the like towards high speed, light weight, automation and multiple functions, the vicious influence of vibration and noise on the stable work of precise electronic instruments and equipment is continuously intensified, the high noise and vibration greatly reduce the fatigue life and service time of the structural member while reducing the precision and reliability of the equipment and system, and great challenge is provided for the safety and comfort of the composite material structural member. The development of a novel structural damping material with high mechanical property and high damping property is very important for carrying out vibration and noise reduction treatment on a structure so as to improve the mechanical environment of the structure, prolong the service time of the structure for bearing cyclic load and impact and the like, and is also one of the hot spots of research in the field of composite materials in recent years.
The traditional vibration damping method mainly adopts a method of adding a damping material, the damping material is a functional material which can absorb vibration mechanical energy and sound energy and convert the vibration mechanical energy and the sound energy into heat energy, electric energy, magnetic energy or other forms of energy to be consumed, and the damping material with high loss factor added into the structure is one of the most effective technical means for inhibiting vibration and noise. The existing ways of adding damping materials can be divided into two categories, namely adding a damping layer outside a structure, and the existing ways are divided into free damping treatment and constrained damping treatment. The free damping treatment is to stick a high-damping additional layer at the position with larger surface strain of the structure, the constrained damping treatment is to add a high-rigidity constrained layer outside the additional damping layer to increase the shear deformation of the damping layer so as to achieve the purpose of consuming vibration energy, and the two methods both belong to passive damping treatment. The method has the defects that the construction is easily limited by various conditions such as structure size, space, quality and the like, and in addition, the damping layer is easily layered and stripped in use; another approach is to incorporate damping materials into the composite structure and co-cure it to form it, which can change the inherent damping and resonant frequency of the structure. The method has the advantages that: firstly, the one-time curing molding can reduce the process cost and does not increase the redundant quality (no additional restraint layer is needed). Secondly, the damping effect of the co-curing damping treatment is better, because the damping material is positioned inside the structure, the structural strain energy is larger, and the energy consumption effect is better. Thirdly, the co-curing damping treatment is considered at the beginning stage of the structure design, and the diversity design can be carried out according to the dynamic environment of the structure and the damping influence factor of the composite material. The viscoelastic material with the damping function is directly co-cured with the composite material prepreg, and the viscoelastic material and the composite material form an interpenetrating network structure through physical fusion or chemical crosslinking, so that the interlayer bonding performance between the viscoelastic material and the composite material is greatly improved. However, the curing temperature required by the co-curing damping composite material developed at present is higher, the requirements of the preparation of the co-curing damping composite material on process conditions and equipment are higher, and the wide use cost is relatively higher.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a novel low-temperature co-curing high-damping composite material and a preparation method thereof. According to the invention, the mercapto compound is used as the curing agent, so that the low-temperature co-curing of the vinyl-terminated organic silicon rubber and the epoxy resin is realized, the prepared composite material has the advantages of no falling off and ageing resistance, the strength of the resin-based fiber composite material is retained, and the damping performance of the structure is greatly improved under the condition of almost no loss of the rigidity of the material.
The technical scheme of the invention is as follows:
a preparation method of a low-temperature co-cured high-damping composite material comprises the following steps:
(1) mixing rubber and a mercapto compound to obtain a viscoelastic material;
(2) cutting the fiber cloth into required size, and brushing the viscoelastic material prepared in the step (1) on two sides of the fiber cloth by adopting a double-side brushing method to prepare prepreg fiber cloth with the viscoelastic material brushed on two sides;
(3) cutting the fiber cloth into required size, and soaking in the epoxy resin mixture to obtain prepreg fiber cloth containing the epoxy resin mixture;
(4) and (3) spraying a release agent on the upper metal template and the lower metal template, sequentially paving the prepreg fiber cloth which is prepared in the step (2) and coated with the viscoelastic material on the double surfaces and the prepreg fiber cloth which is prepared in the step (3) and contains the epoxy resin mixture on the lower metal template sprayed with the release agent, and performing hot-pressing curing to obtain the low-temperature co-curing high-damping composite material.
Further, in the step (1), the rubber is vinyl terminated silicone rubber, and the structural formula of the silicone rubber is as follows:
in the formula: the end group is vinyl; n, m and p are respectively the polymerization degrees of Si-O chain links containing different side groups; r 1 Is OH, Me, Vi or Ph; r 2 Is Me, H, Vi, Ph or-CF 3 CH 2 CH 2 。
Further, in the step (1), the mercapto compound is a mercapto compound containing a bifunctional group, a trifunctional group or a tetrafunctional group.
Further, in the step (1), the molar ratio of the vinyl functional group to the mercapto functional group of the mercapto compound in the rubber is 1: 1.2 to 2.
Further, in the step (2), the amount of the brush coating is 20-100 g/m per side 2 ；
Further, in the step (3), the epoxy resin mixture is a mixture of epoxy resin and a curing agent; the epoxy resin is liquid epoxy, and the liquid epoxy resin is one or two of E51 and E44; the curing agent is an aliphatic curing agent or alicyclic amine curing agent; the mass ratio of the epoxy resin to the curing agent is (2.5-3.5): 1.
further, in the step (4), the laying is performed by coating the prepreg fiber cloth of the viscoelastic material on both sides prepared in the step (2) and the prepreg fiber cloth of the epoxy resin mixture prepared in the step (3) according to the ratio of 2-3: and (3) sequentially laying 8-10 layers, and contacting the prepreg fiber cloth with the viscoelastic material coated on the two sides and prepared in the step (2) with a lower metal template sprayed with a release agent.
Further, in the step (4), the pressure of the hot-pressing curing is 0.5-3.5 MPa.
Further, in the step (4), the curing specifically comprises the following steps: curing at 45-60 ℃ for 1.5-3.5 h, then heating to 65-80 ℃ for curing for 1.5-3.5 h, and finally heating to 90-100 ℃ for curing for 1-3 h.
A low-temperature co-curing high-damping composite material prepared by the preparation method.
The sulfhydryl compound adopts compounds with double functional groups, three functional groups and four functional groups; the mercapto compounds include, but are not limited to, the following compounds:
the curing reaction of the base compound is mainly as follows:
or alternatively
The curing reaction of the rubber with the mercapto compound is as follows:
the co-curing reaction of epoxy resin and rubber with mercapto compound is mainly as follows:
the beneficial technical effects of the invention are as follows:
(1) according to the invention, according to a high molecular theory, viscoelastic material components are designed based on the curing condition of epoxy resin and the vulcanization characteristic of rubber (a cross-linking process of rubber changing from linear to net shape), the viscoelastic material is used for manufacturing a carbon fiber prepreg with a damping material through a brush coating process, then the epoxy resin mixture prepreg and the prepreg with the viscoelastic material coated on both sides are layered according to a preset layering sequence, and an embedded low-temperature co-curing composite material product is prepared through a step-by-step heating hot-pressing curing process, so that the low-temperature co-curing of the resin and the viscoelastic material is realized.
(2) The composite material structure prepared by the invention has the advantages of no shedding and aging resistance, not only maintains the strength of the resin-based fiber composite material, but also greatly improves the damping performance of the structure under the condition of almost no loss of the rigidity of the material.
(3) The reaction of the sulfydryl and the epoxy group and the reaction of the sulfydryl and the vinyl have lower temperature, can completely react at 100 ℃, realizes low-temperature co-curing, and greatly reduces the process conditions of the embedded damping composite material.
Detailed Description
The present invention will be described in detail with reference to examples.
Example 1
A novel low-temperature co-curing high-damping composite material is prepared by the following steps:
(1) weighing 200g of liquid vinyl silicone rubber (110-8) (with the viscosity of 5000cp), adding 80g of 2, 2' - (1, 2-ethanediylbioxoxy) bisethanethiol, and uniformly stirring to obtain a viscoelastic material;
(2) cutting the carbon fiber cloth into required size, and uniformly brushing the viscoelastic material prepared in the step (1) on the carbon fiber cloth by adopting a double-sided brushing method, wherein the brushing amount is 20g/m of single side 2 And preparing the prepreg fiber cloth with the viscoelastic material brushed on the two sides.
(3) Cutting the fiber cloth into required size, and soaking in the epoxy resin mixture to obtain prepreg fiber cloth containing the epoxy resin mixture; the epoxy resin mixture is a mixture of epoxy resin and a curing agent; the epoxy resin is liquid epoxy, and the liquid epoxy resin is E44; the curing agent is isophorone diamine; the mass ratio of the epoxy resin to the curing agent is 2.5: 1.
(4) spraying a release agent on the upper metal template and the lower metal template, and mixing the prepreg carbon fiber cloth prepared in the step (2) with the prepreg fiber cloth containing the epoxy resin mixture prepared in the step (3) according to the ratio of 2: 8 layers are sequentially laid, and the mixture is placed into a temperature test box for hot-pressing curing, wherein the pressure of the hot-pressing curing is 1.2 MPa; and (3) heating the temperature test box according to curing process curves of reacting for 2 hours at 60 ℃, reacting for 2 hours at 80 ℃ and reacting for 3 hours at 100 ℃ to prepare the low-temperature co-curing high-damping composite material.
Example 2
A novel low-temperature co-curing high-damping composite material is prepared by the following steps:
(1) weighing 200g of liquid vinyl silicone rubber (with the viscosity of 5000cp), and adding 160g of 2, 2' - (1, 2-ethanediylbioxoxy) bisethanethiol to obtain a viscoelastic material;
(2) cutting the carbon fiber cloth into required size, and uniformly brushing the viscoelastic material prepared in the step (1) on the carbon fiber cloth by adopting a double-sided brushing method, wherein the brushing amount is 100g/m of single side 2 And preparing the prepreg fiber cloth with the viscoelastic material brushed on the two sides.
(3) Cutting the fiber cloth into required size, and soaking in the epoxy resin mixture to obtain prepreg fiber cloth containing the epoxy resin mixture; the epoxy resin mixture is a mixture of epoxy resin and a curing agent; the epoxy resin is liquid epoxy, and the liquid epoxy resin is E51; the curing agent is isophorone diamine; the mass ratio of the epoxy resin to the curing agent is 3.5: 1.
(4) spraying a release agent on the upper metal template and the lower metal template, and mixing the prepreg carbon fiber cloth prepared in the step (2) with the prepreg fiber cloth containing the epoxy resin mixture prepared in the step (3) according to the ratio of 3: 10 layers are sequentially laid, and the mixture is placed into a temperature test box for hot-pressing curing, wherein the pressure of the hot-pressing curing is 0.5 MPa; the temperature test box is heated according to the curing process curve of reacting at 45 ℃ for 3.5 hours, reacting at 65 ℃ for 1.5 hours and reacting at 90 ℃ for 1 hour to prepare the low-temperature co-curing high-damping composite material.
Example 3
A novel low-temperature co-curing high-damping composite material is prepared by the following steps:
(1) weighing 200g of liquid vinyl silicone rubber (with the viscosity of 5000cp), adding 160g of trimethylolpropane tris (3-mercaptopropionate) and uniformly stirring to obtain a viscoelastic material;
(2) cutting the carbon fiber cloth into required size, and uniformly brushing the viscoelastic material prepared in the step (1) on the carbon fiber cloth by adopting a double-sided brushing method, wherein the brushing amount is 80g/m of single side 2 And preparing the prepreg fiber cloth with the viscoelastic material brushed on the two sides.
(3) Cutting the fiber cloth into required size, and soaking in the epoxy resin mixture to obtain prepreg fiber cloth containing the epoxy resin mixture; the epoxy resin mixture is a mixture of epoxy resin and a curing agent; the epoxy resin is liquid epoxy, and the liquid epoxy resin is E51; the curing agent is isophorone diamine; the mass ratio of the epoxy resin to the curing agent is 3: 1.
(4) spraying a release agent on the upper metal template and the lower metal template, and mixing the prepreg carbon fiber cloth prepared in the step (2) with the prepreg fiber cloth containing the epoxy resin mixture prepared in the step (3) according to the ratio of 3: 9, the layers are sequentially and respectively laid, and the mixture is put into an oven for hot-pressing curing, wherein the pressure of the hot-pressing curing is 3.5 MPa; the oven is heated according to the curing process curve of reacting for 1.5 hours at 50 ℃, reacting for 3.5 hours at 70 ℃ and reacting for 2 hours at 95 ℃ to prepare the low-temperature co-curing high-damping composite material.
Test example:
the mechanical properties between the layers of the composite materials prepared in examples 1-2 were tested, their shore hardness was tested by shore durometer according to national standard, and tensile properties were tested according to national standard. The tear strength was measured by a tear strength tester, and the test results are shown in table 1.
TABLE 1
As can be seen from Table 1, by matching the design of the viscoelastic material with the design of the layering of different materials, the composite material structure prepared by the embodiment of the invention has good hardness and tensile strength, the maximum elongation rate reaches 350.8% (the maximum elongation rate refers to the elongation rate between the composite material plates bonded by the viscoelastic material), and the composite material structure has the advantages of no falling and ageing resistance, not only maintains the strength of the resin matrix fiber composite material, but also improves the damping performance of the composite material.
The foregoing is only a preferred embodiment of the present invention and it should be noted that modifications and adaptations can be made by those skilled in the art without departing from the principle of the present invention and should be considered as the scope of the present invention.
Claims (10)
1. The preparation method of the low-temperature co-curing high-damping composite material is characterized by comprising the following steps of:
(1) mixing rubber and a mercapto compound to obtain a viscoelastic material;
(2) cutting the fiber cloth into required size, and brushing the viscoelastic material prepared in the step (1) on two sides of the fiber cloth by adopting a double-side brushing method to prepare prepreg fiber cloth with the viscoelastic material brushed on two sides;
(3) cutting the fiber cloth into required size, and soaking in the epoxy resin mixture to obtain prepreg fiber cloth containing the epoxy resin mixture;
(4) and (3) spraying a release agent on the upper metal template and the lower metal template, sequentially paving the prepreg fiber cloth which is prepared in the step (2) and coated with the viscoelastic material on the two sides and the prepreg fiber cloth containing the epoxy resin mixture and prepared in the step (3) on the lower metal template sprayed with the release agent, and performing hot-pressing curing to obtain the low-temperature co-cured high-damping composite material.
2. The production method according to claim 1, wherein in the step (1), the rubber is a vinyl-terminated silicone rubber having a structural formula as follows:
in the formula: the end group is vinyl; n, m and p are respectively the polymerization degrees of Si-O chain links containing different side groups; r 1 Is OH, Me, Vi or Ph; r 2 Is Me, H, Vi, Ph or-CF 3 CH 2 CH 2 。
3. The method according to claim 1, wherein in the step (1), the mercapto compound is a mercapto compound having a bifunctional group, a trifunctional group or a tetrafunctional group.
4. The method according to claim 1, wherein in the step (1), the molar ratio of the vinyl group in the rubber to the mercapto group in the mercapto compound is 1: 1.2 to 2.
5. The preparation method according to claim 1, wherein in the step (2), the amount of the brush coating is 20 to 100g/m per side 2 。
6. The method according to claim 1, wherein in the step (3), the epoxy resin mixture is a mixture of an epoxy resin and a curing agent; the epoxy resin is liquid epoxy, and the liquid epoxy resin is one or two of E51 and E44; the curing agent is an aliphatic curing agent or alicyclic amine curing agent; the mass ratio of the epoxy resin to the curing agent is (2.5-3.5): 1.
7. the preparation method according to claim 1, wherein in the step (4), the laying is performed by coating the prepreg fiber cloth with the viscoelastic material on both sides prepared in the step (2) and the prepreg fiber cloth with the epoxy resin mixture prepared in the step (3) in a ratio of 2-3: and (3) sequentially laying 8-10 layers, and contacting the prepreg fiber cloth with the viscoelastic material coated on the two sides and prepared in the step (2) with a lower metal template sprayed with a release agent.
8. The method according to claim 1, wherein in the step (4), the pressure of the hot-press curing is 0.5 to 3.5 MPa.
9. The preparation method according to claim 1, wherein in the step (4), the curing is performed by the following specific process: curing at 45-60 ℃ for 1.5-3.5 h, then heating to 65-80 ℃ for 1.5-3.5 h, and finally heating to 90-100 ℃ for 1-3 h.
10. A low temperature co-cured high damping composite prepared by the preparation method of any one of claims 1-9.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116141703A (en) * | 2023-04-18 | 2023-05-23 | 天津爱思达航天科技股份有限公司 | Polyurethane toughened epoxy damping composite material and preparation method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20080277057A1 (en) * | 2007-01-23 | 2008-11-13 | The Boeing Company | Composite laminate having a damping interlayer and method of making the same |
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