CN115926665A - Elastic self-adhesive conductive sealing gasket with composite structure and preparation method thereof - Google Patents
Elastic self-adhesive conductive sealing gasket with composite structure and preparation method thereof Download PDFInfo
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- CN115926665A CN115926665A CN202211681604.8A CN202211681604A CN115926665A CN 115926665 A CN115926665 A CN 115926665A CN 202211681604 A CN202211681604 A CN 202211681604A CN 115926665 A CN115926665 A CN 115926665A
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- 238000007789 sealing Methods 0.000 title claims abstract description 46
- 239000000853 adhesive Substances 0.000 title claims abstract description 26
- 239000002131 composite material Substances 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 229920001021 polysulfide Polymers 0.000 claims abstract description 35
- 239000005077 polysulfide Substances 0.000 claims abstract description 35
- 150000008117 polysulfides Polymers 0.000 claims abstract description 35
- 229920000767 polyaniline Polymers 0.000 claims abstract description 26
- 229920005749 polyurethane resin Polymers 0.000 claims abstract description 17
- 229910052751 metal Inorganic materials 0.000 claims abstract description 11
- 239000002184 metal Substances 0.000 claims abstract description 11
- 239000012948 isocyanate Substances 0.000 claims abstract description 10
- 150000002513 isocyanates Chemical class 0.000 claims abstract description 10
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000001257 hydrogen Substances 0.000 claims abstract description 8
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 8
- 238000013329 compounding Methods 0.000 claims abstract description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 24
- 239000003054 catalyst Substances 0.000 claims description 20
- -1 polyoxypropylene Polymers 0.000 claims description 19
- 229920001451 polypropylene glycol Polymers 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical compound ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 claims description 16
- 238000002156 mixing Methods 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 14
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 12
- 229910052786 argon Inorganic materials 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 12
- 229920000570 polyether Polymers 0.000 claims description 12
- 150000002009 diols Chemical class 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 claims description 6
- 229910052797 bismuth Inorganic materials 0.000 claims description 6
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 claims description 5
- 239000012975 dibutyltin dilaurate Substances 0.000 claims description 5
- 239000007789 gas Substances 0.000 claims description 5
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- KXBFLNPZHXDQLV-UHFFFAOYSA-N [cyclohexyl(diisocyanato)methyl]cyclohexane Chemical compound C1CCCCC1C(N=C=O)(N=C=O)C1CCCCC1 KXBFLNPZHXDQLV-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 239000003963 antioxidant agent Substances 0.000 claims description 4
- 230000003078 antioxidant effect Effects 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 125000005442 diisocyanate group Chemical group 0.000 claims description 4
- 229920005862 polyol Polymers 0.000 claims description 4
- 150000003077 polyols Chemical class 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- KSBAEPSJVUENNK-UHFFFAOYSA-L tin(ii) 2-ethylhexanoate Chemical compound [Sn+2].CCCCC(CC)C([O-])=O.CCCCC(CC)C([O-])=O KSBAEPSJVUENNK-UHFFFAOYSA-L 0.000 claims description 3
- OXTJFBHLOXGCPW-UHFFFAOYSA-N 6-cyanatohexyl cyanate Chemical compound N#COCCCCCCOC#N OXTJFBHLOXGCPW-UHFFFAOYSA-N 0.000 claims description 2
- 239000005058 Isophorone diisocyanate Substances 0.000 claims description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 2
- 230000001588 bifunctional effect Effects 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 238000007872 degassing Methods 0.000 claims description 2
- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 238000007790 scraping Methods 0.000 claims description 2
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 claims description 2
- 229910052725 zinc Inorganic materials 0.000 claims description 2
- 239000011701 zinc Substances 0.000 claims description 2
- 239000011148 porous material Substances 0.000 claims 1
- 239000002904 solvent Substances 0.000 abstract description 9
- 238000005260 corrosion Methods 0.000 abstract description 6
- 230000007797 corrosion Effects 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 5
- 239000003566 sealing material Substances 0.000 abstract description 5
- 230000002195 synergetic effect Effects 0.000 abstract description 3
- 229920002635 polyurethane Polymers 0.000 abstract 1
- 239000004814 polyurethane Substances 0.000 abstract 1
- 239000011344 liquid material Substances 0.000 description 8
- 238000004806 packaging method and process Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 5
- 239000003921 oil Substances 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 description 4
- 229920001971 elastomer Polymers 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000000565 sealant Substances 0.000 description 3
- 238000002791 soaking Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000002210 silicon-based material Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- JRBRVDCKNXZZGH-UHFFFAOYSA-N alumane;copper Chemical compound [AlH3].[Cu] JRBRVDCKNXZZGH-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910021485 fumed silica Inorganic materials 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Sealing Material Composition (AREA)
Abstract
The invention relates to an elastic self-adhesive conductive sealing gasket with a composite structure and a preparation method thereof, belonging to the field of sealing materials. The gasket is formed by compounding and processing polysulfide and conductive polyaniline synergistically modified polyurethane resin and a metal mesh. The modified polyurethane resin consists of a component A and a component B, wherein the component A is a conductive polyaniline modified active hydrogen component, and the component B is a polysulfide modified isocyanate prepolymer component. The gasket provided by the invention adopts the polyurethane resin synergistically modified by polysulfide and conductive polyaniline, so that the gasket has high-elasticity self-adhesiveness of polyurethane and solvent resistance of polysulfide, and meanwhile, the introduction of the conductive polyaniline improves the conductivity of the material and has synergistic effect with a conductive metal mesh, so that the gasket has excellent sealing property, conductivity and corrosion resistance.
Description
Technical Field
The invention relates to the field of sealing gaskets, in particular to an elastic self-adhesive conductive sealing gasket with a composite structure and a preparation method thereof.
Background
The sealing material has the advantages of simple construction, long service life, reliable sealing performance, electric conduction and the like. If the sealing is not proper, the corrosion of the structure and the system can be caused, so that the service life is greatly reduced, and the cost is increased.
The conventional sealing method uses a rubber gasket or sealant as a sealing material. Although the rubber gasket is simple and convenient to install, the rubber gasket has no bonding effect on an interface, the sealing failure is caused by long-term vibration fatigue, the comprehensive protection effect is not good, and particularly, the corrosion inside a machine body is serious in a marine environment; secondly, the use process needs vulcanization, and the working procedure is more complex. The sealant has good sealing effect, but needs to be prepared and constructed on site, has complex working procedures, long period, great influence on construction quality by human factors and insufficient reliability.
In order to solve the above problems, in recent years, elastic self-adhesive gaskets have been gradually popularized and applied, and materials thereof are mainly polyurethane resin and silicone resin, and are subjected to pre-curing molding, so that the gasket is easy to use and has a good sealing effect. But the common polyurethane resin has poor solvent resistance and short sealing life; the organic silicon resin has low bonding strength, and silicone oil is easy to seep out to pollute a bonding interface to cause sealing failure.
Therefore, a sealing material having the characteristics of corrosion resistance, moisture resistance, pressure resistance, wear resistance, fatigue resistance and long service life is in demand. The elastic self-adhesive conductive sealing gasket with the composite structure provided by the invention has the advantages, and simultaneously has excellent conductivity, is easy to disassemble after installation, and does not leave silicon oil residues in the using or removing process.
Disclosure of Invention
In order to solve the problems of the existing sealing material, the invention aims to provide an elastic self-adhesive conductive sealing gasket with a composite structure and a preparation method thereof. The gasket provided by the invention adopts the polyurethane resin synergistically modified by polysulfide and conductive polyaniline, has high-elasticity self-adhesiveness and polysulfide solvent resistance of the polyurethane resin, and simultaneously, the introduction of the conductive polyaniline improves the conductivity of the material and has synergistic effect with a conductive metal mesh, so that the gasket has excellent sealing property, conductivity and corrosion resistance. Meanwhile, as the use of organic silicon materials is avoided, silicon oil residues cannot be left in the using or removing process of the gasket.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the gasket is formed by pouring, curing and compounding polysulfide and polyaniline synergistically modified polyurethane resin and a metal mesh, wherein the modified polyurethane resin consists of a component A and a component B, the component A is a conductive polyaniline modified active hydrogen component, the component B is a polysulfide modified isocyanate prepolymer component, and the polysulfide and polyaniline synergistically modified polyurethane resin is obtained by mixing the component A and the component B according to the weight ratio of 1. Wherein,
the component A comprises the following raw materials in parts by weight:
the component B comprises the following raw materials in parts by weight:
the metal net is an aluminum net or a copper net, the thickness is 0.5-0.6mm, and the aperture is 1.2-1.3mm.
In the component A, the trifunctional polyether polyol is polyoxypropylene triol, and the molecular weight is 3000-7000; the molecular weight of the difunctional liquid polysulfide is 1000-2500; the conductive polyaniline is spherical and has the particle size of 30-60nm; the catalyst A is at least one of an organic bismuth catalyst and an organic zinc catalyst.
In the component B, the molecular weight of the difunctional liquid polysulfide is 1000-2500; the polyether diol is polyoxypropylene diol, and the molecular weight is 500-2000; the polyether triol is polyoxypropylene triol, and the molecular weight is 3000-7000; the diisocyanate is at least one of toluene diisocyanate, dicyclohexylmethane diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate and hexamethylene dicyanate; the antioxidant is 1010; the catalyst B is at least one of dibutyltin dilaurate, stannous octoate and triethylamine.
Further, the invention also provides a preparation method of the composite structure elastic self-adhesive conductive sealing gasket, which comprises the following steps:
preparation of the A component
Adding trifunctional polyether polyol and bifunctional liquid polysulfide into a reactor for mixing according to parts by weight, heating to 100-120 ℃, vacuumizing for dewatering for 2 hours, then cooling to room temperature, adding conductive nano polyaniline and a catalyst A, removing bubbles under the vacuum state of-0.095-0.1 Mpa, strongly stirring uniformly, removing vacuum by using dry argon gas to obtain a component A, namely a conductive polyaniline modified active hydrogen component, and putting the prepared mixture into a closed container;
preparation of the B component
Mixing polyether diol, polyether triol, difunctional liquid polysulfide and an antioxidant in parts by weight, heating to 100-120 ℃, vacuumizing to remove water for 2h, cooling to 60-80 ℃, adding diisocyanate and a catalyst B for reaction, reacting at 70-80 ℃ for 3h under the protection of argon to obtain a B component polysulfide modified isocyanate prepolymer component, and transferring the B component polysulfide modified isocyanate prepolymer component into a closed container to be sealed and stored in a manner of isolating air and moisture;
3. preparation of elastic self-adhesive conductive sealing gasket with composite structure
And (2) degassing the component A and the component B, uniformly mixing the component A and the component B at room temperature according to the weight ratio of 1 example, pouring the mixture into a mold with an aluminum net or a copper net, uniformly scraping and coating the mixture, wherein the total thickness is 1.2-1.8mm, and standing the mixture at room temperature for 48 hours to completely cure the mixture, thereby preparing the elastic self-adhesive conductive sealing gasket with the composite structure.
Compared with the prior art, the invention has the following beneficial effects:
1. the elastic self-adhesive conductive sealing gasket with the composite structure adopts the polyurethane resin cooperatively modified by polysulfide and conductive polyaniline, has high elastic self-adhesiveness and polysulfide solvent resistance of the polyurethane resin, improves the conductivity of the material by introducing the conductive polyaniline, and has a synergistic effect with a conductive metal mesh, so that the gasket has excellent sealing property, conductivity and corrosion resistance, the sealing life of the gasket under the conditions of various media such as lubricating oil is remarkably prolonged, and the gasket can be used for sealing parts such as antennas and lightning protection.
2. The modified polyurethane resin used by the composite structure elastic self-adhesion conductive sealing gasket has low hardness, high elasticity and self-adhesion effect, is compounded with the aluminum (copper) metal net, improves the conductivity, is used as a reinforcing material to endow the gasket with higher mechanical strength, can bear higher installation pressure and vibration fatigue load, has the sealing advantages of a sealant and a rubber gasket, and has good sealing effect and long service life.
3. The composite structure elastic self-adhesive conductive sealing gasket adopts the pre-cured modified polyurethane resin, can be cut and molded in advance according to the size of a sealing part, does not need on-site mixing construction and curing, and is simple and convenient to use and short in installation period. Meanwhile, the gasket can be detached and reused.
4. The elastic self-adhesive conductive sealing gasket with the composite structure avoids using an organic silicon material, so that silicon oil residues cannot be left in the using or removing process of the gasket.
5. The elastic self-adhesive conductive sealing gasket with the composite structure has wide application range, can be used in the fields of aerospace, rail transit, electronic components and the like, and is particularly suitable for sealing and protecting various antennas of helicopters and airplanes of various types.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further illustrated by the following examples, which are provided by way of illustration of the present invention and not by way of limitation. The experimental procedures in the following examples were carried out in a conventional manner unless otherwise specified, and materials, reagents and the like used in the following examples were commercially available unless otherwise specified.
Example 1
(1) Preparation of component A:
adding 30 parts of polyoxypropylene triol (molecular weight 5000) and 25 parts of difunctional liquid polysulfide (molecular weight 2500) into a reactor, fully mixing, heating to 100-120 ℃, vacuumizing for dewatering for 2 hours, cooling to room temperature, detecting that the water content of a liquid material is less than 100ppm, adding 10 parts of conductive nano polyaniline and 0.016 part of organic bismuth catalyst, removing bubbles under the vacuum state of-0.095-0.1 MPa, strongly stirring until the system is uniform, removing vacuum by using dry argon gas to obtain a component A, namely a conductive polyaniline modified active hydrogen component, and putting the prepared mixture into a closed container;
(2) Preparation of the component B:
adding 10 parts of difunctional liquid polysulfide (molecular weight of 2500), 20 parts of polyoxypropylene diol (molecular weight of 2000) and 12 parts of polyoxypropylene triol (molecular weight of 5000) into a dry 500mL four-mouth bottle, adding 0.15 part of antioxidant 1010, heating to 100-120 ℃, vacuumizing to remove water for 2h, detecting that the water content of the liquid material is less than 100ppm, cooling to 60-80 ℃, adding 23.5 parts of dicyclohexylmethane diisocyanate, adding 0.034 part of dibutyltin dilaurate as a catalyst, reacting for 3h at 70-80 ℃ under the protection of argon to obtain a B component polysulfide modified isocyanate prepolymer component, and transferring into a closed container to be sealed and stored in a manner of isolating air and moisture;
(3) Preparing an elastic self-adhesive conductive sealing gasket with a composite structure:
and (3) hermetically packaging the prepared component A and the component B in a certain packaging form, uniformly mixing at room temperature according to the weight ratio of 1.
Example 2
(1) Preparation of component A:
adding 35 parts of polyoxypropylene triol (molecular weight 5000) and 20 parts of difunctional liquid polysulfide (molecular weight 2500) into a reactor, fully mixing, heating to 100-120 ℃, vacuumizing for dewatering for 2 hours, cooling to room temperature, detecting that the water content of a liquid material is less than 100ppm, adding 20 parts of conductive nano polyaniline and 0.016 part of organic bismuth catalyst, removing bubbles under the vacuum state of-0.095-0.1 MPa, strongly stirring until the system is uniform, removing vacuum by using dry argon gas to obtain a component A, namely a conductive polyaniline modified active hydrogen component, and putting the prepared mixture into a closed container;
(2) Preparation of the component B:
adding 15 parts of difunctional liquid polysulfide (molecular weight of 2500), 15 parts of polyoxypropylene diol (molecular weight of 2000) and 20 parts of polyoxypropylene triol (molecular weight of 5000) into a dry 500mL four-mouth bottle, adding 0.18 part of antioxidant 1010, heating to 100-120 ℃, vacuumizing to remove water for 2h, detecting that the water content of the liquid material is less than 100ppm, cooling to 60-80 ℃, adding 26.5 parts of compound dicyclohexylmethane diisocyanate and diphenylmethane diisocyanate, adding 0.5 part of stannous octoate as a catalyst, reacting for 3h at 70-80 ℃ under the protection of argon to prepare a B component polysulfide modified isocyanate prepolymer component, and transferring the B component into a closed container to be sealed and stored in a mode of isolating air and moisture;
(3) Preparing an elastic self-adhesive conductive sealing gasket with a composite structure:
and (3) hermetically packaging the prepared component A and the component B in a certain packaging form, uniformly mixing at room temperature according to the weight ratio of 1.
Example 3
(1) Preparation of component A:
adding 40 parts of polyoxypropylene triol (molecular weight 5000) and 15 parts of difunctional liquid polysulfide (molecular weight 2500) into a reactor, fully mixing, heating to 100-120 ℃, vacuumizing for dewatering for 2 hours, cooling to room temperature, detecting that the water content of a liquid material is less than 100ppm, adding 30 parts of conductive nano polyaniline and 0.018 part of organic bismuth catalyst, removing bubbles under the vacuum condition that the pressure is-0.095-0.1 MPa, strongly stirring until the system is uniform, removing the vacuum by using dry argon gas to obtain a component A, namely a conductive polyaniline modified active hydrogen component, and putting the prepared mixture into a closed container;
(2) Preparation of the component B:
adding 20 parts of difunctional liquid polysulfide (molecular weight of 2500), 30 parts of polyoxypropylene diol (molecular weight of 2000) and 10 parts of polyoxypropylene triol (molecular weight of 5000) into a dry 500mL four-port bottle, adding 0.2 part of antioxidant 1010, heating to 100-120 ℃, vacuumizing to remove water for 2h, detecting that the water content of the liquid material is less than 100ppm, cooling to 60-80 ℃, adding 35 parts of diphenylmethane diisocyanate and 0.045 part of dibutyltin dilaurate as a catalyst, reacting for 3h at 70-80 ℃ under the protection of argon to prepare a B component polysulfide modified isocyanate prepolymer component, transferring the B component into a closed container, and sealing and storing in a manner of isolating air and moisture; (3) Preparing an elastic self-adhesive conductive sealing gasket with a composite structure:
and (3) hermetically packaging the prepared component A and the prepared component B in a certain packaging form, uniformly mixing the components in a weight ratio of 1.
Comparative example 1
(1) Preparation of component A:
adding 45 parts of polyoxypropylene triol (with the molecular weight of 5000) into a reactor, heating to 100-120 ℃, vacuumizing for dewatering for 2 hours, then cooling to room temperature, detecting that the moisture content of a liquid material is less than 100ppm, adding 20 parts of fumed silica, adding 0.016 part of organic bismuth catalyst, removing bubbles under the vacuum state of the pressure of-0.095-0.1 Mpa, stirring strongly until the system is uniform, removing vacuum by using dry argon to obtain a component A, and putting the prepared mixture into a closed container;
(2) Preparation of the component B:
adding 20 parts of polyoxypropylene diol (molecular weight 2000) and 22 parts of polyoxypropylene triol (molecular weight 5000) into a dry 500mL four-mouth bottle, adding 0.15 part of antioxidant 1010, heating to 100-120 ℃, vacuumizing to remove water for 2h, cooling to 60-80 ℃ after detecting the moisture content of liquid materials to be less than 100ppm, adding 23.5 parts of dicyclohexylmethane diisocyanate, adding 0.034 part of dibutyltin dilaurate serving as a catalyst, reacting for 3h at 70-80 ℃ under the protection of argon to obtain a component B, transferring into a closed container, and sealing and storing by isolating air and moisture;
(3) Preparing an elastic self-adhesive conductive sealing gasket with a composite structure:
and (3) hermetically packaging the prepared component A and the prepared component B in a certain packaging form, uniformly mixing the components at room temperature according to the weight ratio of 1.
Performance testing
1. Hardness (shore O): according to the GB/T531.1-2008 standard, the measurement is carried out by adopting a Shore durometer.
2. Peel strength: and the peeling degree of the aluminum alloy plate is 180 degrees, and the measurement is carried out according to the GB/T2792 standard.
3. Lap resistance: measured using a Ullidide (UNI-T) UT620C milliohm Meter.
4. Water vapor transmission rate: according to the GB/T30412-2013 standard, a moderate sensor method is adopted for measurement.
5. Solvent resistance: the solvent resistance test of the composite structure elastic self-adhesive conductive sealing gasket comprises the steps of respectively placing the gasket in water and No. 15 aviation hydraulic oil, preserving heat at 30 ℃ for 30 days, measuring the weight change of the gasket before and after soaking, and calculating the oil absorption rate and the water absorption rate.
The absorption rate was calculated as:
in the formula: m is 1 -represents the mass after soaking;
m 0 representing the mass before soaking.
The examples and comparative examples were tested for performance as shown in table 1.
TABLE 1 comparison of the Performance of the examples and comparative examples
As can be seen from the test data in Table 1, the hardness and peel strength of the example and comparative example gaskets are not greatly different and the performance is equivalent. However, the lap resistance of the gasket of the embodiment of the invention is lower than that of the gasket of the comparative example, which shows that the conductivity of the gasket of the invention is higher than that of the comparative example, and the conductivity is greatly improved, and simultaneously, the water vapor transmission rate, the oil absorption rate and the water absorption rate of the gasket of the invention are lower than those of the gasket of the comparative example, which shows that the solvent resistance of the gasket of the invention is also greatly improved, because the conductive polyaniline and polysulfide with solvent resistance are introduced into the polyurethane resin, the conductivity and the solvent resistance of the gasket are greatly improved.
The embodiments described above are implementations of the invention having significant features, and the invention can be implemented in other ways, and any obvious alterations without departing from the inventive concept are within the scope of the invention.
Claims (5)
1. The elastic self-adhesive conductive sealing gasket with a composite structure is characterized in that the gasket is formed by pouring, curing and compounding polysulfide and polyaniline synergistically modified polyurethane resin and a metal mesh, the modified polyurethane resin consists of a component A and a component B, the component A is a conductive polyaniline modified active hydrogen component, the component B is a polysulfide modified isocyanate prepolymer component, and the component A and the component B are mixed according to a weight ratio of 1,
the component A comprises the following raw materials in parts by weight:
the component B comprises the following raw materials in parts by weight:
2. the composite elastic self-adhesive conductive sealing gasket of claim 1, wherein the metal mesh is an aluminum mesh or a copper mesh, the thickness of the metal mesh is 0.5-0.6mm, and the pore diameter of the metal mesh is 1.2-1.3mm.
3. The composite elastic self-adhesive conductive sealing gasket according to claim 1, wherein in the component A, the trifunctional polyether polyol is polyoxypropylene triol, and the molecular weight is 3000-7000; the molecular weight of the difunctional liquid polysulfide is 1000-2500; the conductive nano polyaniline is spherical, and the particle size is 30-60nm; the catalyst A is at least one of an organic bismuth catalyst and an organic zinc catalyst.
4. The composite elastic self-adhesive conductive sealing gasket of claim 1, wherein in said B component, said difunctional liquid polysulfide has a molecular weight of 1000 to 2500; the polyether diol is polyoxypropylene diol, and the molecular weight is 500-2000; the polyether triol is polyoxypropylene triol, and the molecular weight is 3000-7000; the diisocyanate is at least one of toluene diisocyanate, dicyclohexylmethane diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate and hexamethylene dicyanate; the antioxidant is 1010; the catalyst B is at least one of dibutyltin dilaurate, stannous octoate and triethylamine.
5. The method for preparing the elastic self-adhesive conductive sealing gasket with the composite structure according to claim 1, wherein the method comprises the following steps:
(1) Preparation of component A
Adding trifunctional polyether polyol and bifunctional liquid polysulfide into a reactor for mixing according to parts by weight, heating to 100-120 ℃, vacuumizing for dewatering for 2 hours, then cooling to room temperature, adding conductive nano polyaniline and a catalyst A, removing bubbles under the vacuum state of-0.095-0.1 Mpa, strongly stirring uniformly, removing vacuum by using dry argon gas to obtain a component A, namely a conductive polyaniline modified active hydrogen component, and putting the prepared mixture into a closed container;
(2) Preparation of component B
Mixing polyether diol, polyether triol, difunctional liquid polysulfide and antioxidant in parts by weight, heating to 100-120 ℃, vacuumizing to remove water for 2h, cooling to 60-80 ℃, adding diisocyanate and a catalyst B for reaction, reacting for 3h at 70-80 ℃ under the protection of argon to obtain a component B polysulfide modified isocyanate prepolymer component, and transferring the component B polysulfide modified isocyanate prepolymer component into a closed container to be sealed and stored in a manner of isolating air and moisture;
(3) Preparation of elastic self-adhesive conductive sealing gasket with composite structure
And degassing the component A and the component B, uniformly mixing the component A and the component B at room temperature according to the weight ratio of 1 example to 1 example, pouring the mixture into a mold with an aluminum net or a copper net, uniformly scraping and coating the mixture to obtain a total thickness of 1.2-1.8mm, and standing the mixture at room temperature for 48 hours to completely cure the mixture so as to obtain the elastic self-adhesive conductive sealing gasket with a composite structure.
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