CN118064042A - Sealing protective coating and preparation method and application thereof - Google Patents
Sealing protective coating and preparation method and application thereof Download PDFInfo
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- CN118064042A CN118064042A CN202410025199.7A CN202410025199A CN118064042A CN 118064042 A CN118064042 A CN 118064042A CN 202410025199 A CN202410025199 A CN 202410025199A CN 118064042 A CN118064042 A CN 118064042A
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- 238000007789 sealing Methods 0.000 title claims abstract description 45
- 239000011253 protective coating Substances 0.000 title claims abstract description 43
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000007788 liquid Substances 0.000 claims abstract description 47
- 239000004721 Polyphenylene oxide Substances 0.000 claims abstract description 33
- 229920000570 polyether Polymers 0.000 claims abstract description 33
- 239000003085 diluting agent Substances 0.000 claims abstract description 25
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000003063 flame retardant Substances 0.000 claims abstract description 24
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000004005 microsphere Substances 0.000 claims abstract description 22
- 229920005862 polyol Polymers 0.000 claims abstract description 21
- 150000003077 polyols Chemical class 0.000 claims abstract description 21
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000004014 plasticizer Substances 0.000 claims abstract description 20
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 19
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 18
- 239000000945 filler Substances 0.000 claims abstract description 16
- 229920005906 polyester polyol Polymers 0.000 claims abstract description 15
- 239000012948 isocyanate Substances 0.000 claims abstract description 14
- 150000002513 isocyanates Chemical class 0.000 claims abstract description 14
- 239000000049 pigment Substances 0.000 claims abstract description 14
- 239000004970 Chain extender Substances 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 150000001412 amines Chemical class 0.000 claims abstract description 12
- 230000001681 protective effect Effects 0.000 claims abstract description 11
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 9
- 239000004965 Silica aerogel Substances 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 5
- 238000000576 coating method Methods 0.000 claims description 56
- 239000011248 coating agent Substances 0.000 claims description 52
- 239000003795 chemical substances by application Substances 0.000 claims description 29
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 28
- 238000003756 stirring Methods 0.000 claims description 26
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 21
- 239000002518 antifoaming agent Substances 0.000 claims description 21
- 238000010438 heat treatment Methods 0.000 claims description 21
- 239000000080 wetting agent Substances 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 15
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 claims description 14
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 14
- 229920001451 polypropylene glycol Polymers 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 13
- 229920000728 polyester Polymers 0.000 claims description 11
- 150000002009 diols Chemical class 0.000 claims description 10
- -1 polyoxypropylene Polymers 0.000 claims description 10
- 238000004806 packaging method and process Methods 0.000 claims description 9
- 229940008841 1,6-hexamethylene diisocyanate Drugs 0.000 claims description 6
- 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 6
- 239000011521 glass Substances 0.000 claims description 6
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 claims description 6
- 229920001610 polycaprolactone Polymers 0.000 claims description 6
- 239000004632 polycaprolactone Substances 0.000 claims description 6
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- 229920000909 polytetrahydrofuran Polymers 0.000 claims description 6
- 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 6
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 claims description 5
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical group [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 5
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- 239000004205 dimethyl polysiloxane Substances 0.000 claims description 5
- 239000006185 dispersion Substances 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 5
- 239000000347 magnesium hydroxide Substances 0.000 claims description 5
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
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- 239000008029 phthalate plasticizer Substances 0.000 claims description 5
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 5
- 229910052580 B4C Inorganic materials 0.000 claims description 4
- VIJYFGMFEVJQHU-UHFFFAOYSA-N aluminum oxosilicon(2+) oxygen(2-) Chemical compound [O-2].[Al+3].[Si+2]=O VIJYFGMFEVJQHU-UHFFFAOYSA-N 0.000 claims description 4
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 4
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- 230000004048 modification Effects 0.000 claims description 4
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- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 4
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 4
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 4
- 238000009736 wetting Methods 0.000 claims description 4
- 230000004888 barrier function Effects 0.000 claims description 3
- XXMIOPMDWAUFGU-UHFFFAOYSA-N hexane-1,6-diol Chemical compound OCCCCCCO XXMIOPMDWAUFGU-UHFFFAOYSA-N 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 230000001680 brushing effect Effects 0.000 claims description 2
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 2
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 2
- 238000007761 roller coating Methods 0.000 claims description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims 2
- 239000005354 aluminosilicate glass Substances 0.000 claims 2
- 229910052710 silicon Inorganic materials 0.000 claims 2
- 239000010703 silicon Substances 0.000 claims 2
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- 238000010276 construction Methods 0.000 abstract description 3
- 239000008199 coating composition Substances 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
- 230000000694 effects Effects 0.000 description 12
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
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- 125000000524 functional group Chemical group 0.000 description 5
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- 125000003277 amino group Chemical group 0.000 description 4
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- 150000001875 compounds Chemical class 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
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- 239000013530 defoamer Substances 0.000 description 4
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- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 4
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- 229920002635 polyurethane Polymers 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 239000012943 hotmelt Substances 0.000 description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
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- 235000012239 silicon dioxide Nutrition 0.000 description 3
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 2
- 229920002396 Polyurea Polymers 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
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- 229910000323 aluminium silicate Inorganic materials 0.000 description 2
- 239000003575 carbonaceous material Substances 0.000 description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
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- 230000000379 polymerizing effect Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- KMBMQZQZBOLJHN-UHFFFAOYSA-N 2-methyloxirane;oxolane Chemical compound CC1CO1.C1CCOC1 KMBMQZQZBOLJHN-UHFFFAOYSA-N 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 241000238631 Hexapoda Species 0.000 description 1
- 206010053615 Thermal burn Diseases 0.000 description 1
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- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
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Landscapes
- Paints Or Removers (AREA)
Abstract
The invention relates to a sealing protective coating and a preparation method and application thereof, belonging to the field of coating compositions. The sealing protective coating comprises a liquid A and a liquid B, wherein the mass ratio of the liquid A to the liquid B is 3:1-8:1. The solution A comprises the following raw materials in parts by weight: 20-60 parts of polyether polyol, 20-30 parts of polyester polyol and 20-50 parts of isocyanate. The liquid B comprises the following raw materials in parts by weight: 25-55 parts of pigment filler, 15-35 parts of polyether amine, 8-25 parts of chain extender, 3-8 parts of plasticizer, 3-8 parts of reactive diluent, 1-5 parts of auxiliary agent and 5-15 parts of flame retardant. The pigment and filler comprises hollow microspheres and graphene, and silica aerogel and/or titanium dioxide can be added. And (3) fully mixing the solution A and the solution B during construction to form a layer of closed protective film, so as to play a role in sealing and protecting. The protective film can be removed by tearing off and peeling off.
Description
Technical Field
The invention belongs to the field of coating compositions, and particularly relates to a sealing protective coating, a preparation method and application thereof.
Background
The disclosure of this background section is only intended to increase the understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art already known to those of ordinary skill in the art.
The existing packaging protection materials, packaging protection modes and methods have specific and certain application range requirements, and along with the continuous improvement of the material packaging protection technical requirements, new packaging protection materials and packaging protection methods are required to be continuously researched, the packaging protection technical level is improved, and the material packaging protection technical requirements are met. At present, the demands of various industries on the sealing and protecting technology are more and more obvious. The surface of the product is provided with a paint film with a protective effect, so that scratches, bumps, scalds, yellowing and the like in the use process can be effectively prevented; the surface of the equipment package is provided with the coating with the sealing function, so that the equipment can be effectively protected from being corroded by friction, collision, dust, water vapor and salt mist in the transportation and long-time storage processes; the metal spraying part is provided with a coating with a protective function, so that oxidation, corrosion, secondary pollution and the like can be prevented; the paint film for sealing and protecting is arranged outside the spare parts, so that the spare parts can be kept as new all the time, and the spare parts can be used at any time.
In the process of sealing and protecting articles, the sealing effect of the articles is reduced due to the comprehensive effects of rain and snow, humidity, acid and alkali, temperature and other environmental factors. The air temperature and humidity are most seriously affected, and are usually shown by corrosion of metal products, mildew and rot of textile and fur products, mildew and fog or glue spreading of optical instruments, failure of electronic components, aging of high polymer products and the like.
Therefore, the preparation of the sealing coating for sealing the protected equipment and the articles, keeping the interiors of the protected equipment and the articles dry, reducing natural erosion and being a main way for preventing or delaying the quality change of the core components of the protected equipment and the articles. When the protected equipment and the articles are started, the sealing coating on the outer surface is removed, or the sealing coating outside the article package is removed, so that the protected equipment and the articles with perfect preservation state can be used immediately.
Besides the general requirements of shock resistance, mildew resistance, moisture resistance, rust resistance, insect resistance, etc., the sealing protective coating also needs to have good sealing, oil stain resistance, pollution such as mud, water resistance, flame retardance, etc., and has the characteristics of simple and convenient use, quick removal and less residue after removal. Generally, the coating with good sealing effect and high mechanical property has high peel strength and tearing strength, is difficult to remove and is not easy to operate. The solvent-type strippable protective coating contains an organic solvent, is harmful to the environment and human body, and has limited use occasions; the hot-melt type strippable protective coating material has low self strength, complex coating process, poor stripping effect and the like; the water-based strippable protective coating has limited thickness and poor durability, has poor functions of collision and the like on protective equipment and articles, and is also unsuitable for protecting equipment such as metal instruments, precise electronic instruments and the like due to the existence of water.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the sealing protective coating, and the preparation method and the application thereof, wherein the sealing protective coating has the characteristics of rapid solidification, strong adaptability of complex special-shaped structures (such as irregular bulges, pits, gaps and the like), excellent performance and rapid peeling and unsealing.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
In the first aspect, the sealing protective coating comprises a liquid A and a liquid B, wherein the mass ratio of the liquid A to the liquid B is 3:1-8:1.
The solution A comprises the following raw materials in parts by weight: 20-60 parts of polyether polyol, 20-30 parts of polyester polyol and 20-50 parts of isocyanate.
The liquid B comprises the following raw materials in parts by weight: 25-55 parts of pigment filler, 15-35 parts of polyether amine, 8-25 parts of chain extender, 3-8 parts of plasticizer, 3-8 parts of reactive diluent, 1-5 parts of auxiliary agent and 5-15 parts of flame retardant.
The pigment and filler comprises hollow microspheres and graphene; the amount of the hollow microspheres is more than or equal to 10 parts, and the amount of the graphene is more than or equal to 5 parts.
The hollow microsphere is ceramic hollow microsphere or glass hollow microsphere, the particle size is 60-120 mu m, and the crushing strength is more than 15MPa.
The graphene is graphene oxide.
Optionally, silica aerogel and/or titanium dioxide are added into the pigment and filler.
The particle size of the silica aerogel is 10-30 mu m, and the diameter of the gap is 20-50 nm.
The titanium dioxide is as follows: the solar reflectance of the rutile type titanium dioxide subjected to aluminum surface modification is more than or equal to 80 percent.
Optionally, the plasticizer is a phthalate plasticizer.
Optionally, the reactive diluent is a multifunctional reactive diluent.
Optionally, the flame retardant is an aluminum hydroxide or magnesium hydroxide flame retardant.
Optionally, the polyether polyol in the liquid a comprises: one or more of polyoxypropylene glycol, polytetrahydrofuran glycol and tetrahydrofuran-propylene oxide copolyglycol.
Optionally, the polyester polyol in the liquid a comprises: one or more of polycaprolactone polyol, polycarbonate diol and polyester diol.
Optionally, the isocyanate in the liquid a comprises: toluene diisocyanate, diphenylmethane diisocyanate, 1, 6-hexamethylene diisocyanate.
Optionally, the polyetheramine in solution B comprises: one or more of amino-terminated polyoxypropylene ether and amino-terminated polyoxyethylene ether.
Optionally, the chain extender in the solution B includes: one or more of 1, 4-butanediol, 1, 6-hexanediol and trimethylolpropane.
Optionally, the auxiliary agent in the liquid B comprises one or more of a leveling agent, a defoaming agent and a wetting agent. The leveling agent is an organosilicon leveling agent, in particular a polyether modified organosilicon leveling agent or a polyester modified organosilicon leveling agent; the defoaming agent is an organosilicon defoaming agent, and is specifically a polydimethylsiloxane defoaming agent; the wetting agent is a wetting dispersion type wetting agent.
Optionally, the ceramic hollow microspheres are made of aluminum oxide, aluminum oxide-silicon oxide, silicon carbide and boron carbide or modified materials based on the aluminum oxide, the aluminum oxide-silicon oxide, the silicon carbide and the boron carbide.
The hollow glass microspheres are made of aluminosilicate or modified materials based on aluminosilicate.
In a second aspect, the preparation method of the sealing protective coating includes:
the preparation method of the solution A comprises the following steps: weighing polyether polyol and polyester polyol, putting the weighed polyether polyol and polyester polyol into a container, stirring and heating the mixture to 100-180 ℃, preserving heat for 1-2 hours, and then cooling the temperature in the heated container to room temperature; and adding isocyanate into the solution, stirring, heating to 60-90 ℃, and preserving heat for 1-2 hours to obtain solution A.
The preparation method of the solution B comprises the following steps: the pigment filler, polyether amine and chain extender are weighed and then put into a container, fully stirred and dispersed, and after the plasticizer, the reactive diluent, the auxiliary agent and the flame retardant are added, fully stirred and dispersed, wet ground and filtered by a filter screen with 100-400 meshes to obtain the liquid B.
The liquid A and the liquid B are packaged and stored respectively, and the liquid A and the liquid B have good film forming performance after being fully mixed together when in use and can be cured into films in a short time, thus becoming a usable sealing protective coating.
Optionally, in the preparation method of the solution A, polyether polyol and polyester polyol are weighed and then put into a container, stirred and heated to 150 ℃, and the temperature is kept for 1 hour and then reduced to room temperature; and adding isocyanate, stirring and heating to 80 ℃, and maintaining for 2 hours to obtain solution A.
In a third aspect, the use of the above-described containment barrier coating in the containment barrier of equipment and articles.
The sealing protective coating is used on the surfaces of equipment and articles in a spraying, brushing or roller coating mode, and can form a layer of sealing protective film after being dried in air for a short time after being coated on the surfaces, so as to play a role in sealing and protecting.
When the equipment and the articles are unsealed for use, the protective film is removed in a tearing and peeling mode, so that the equipment and the articles can be easily torn and peeled off, are completely peeled off, basically have no residue, and do not have any influence on the protected equipment and the articles.
The beneficial effects of the invention are as follows:
1. the sealing protective coating provided by the invention is divided into two components, namely the solution A and the solution B, which are fully mixed together during construction and use, so that the sealing protective coating has good film forming performance, the solution A and the solution B cannot be dried to form a film before being mixed, and the sealing protective coating has no good coating performance and is convenient to store and operate.
2. The sealing protective coating disclosed by the invention can be coated on the surfaces of the protected equipment and articles to be rapidly dried to form a layer of flexible, compact and continuous coating film, can isolate mediums such as water, air and salt mist from directly contacting the protected equipment and articles, has the protection effects of preventing dirt, stains, rust, ultraviolet rays, high and low temperature, harmful substances and the like on the protected equipment and articles, and ensures that the protected equipment and articles can be stably sealed for a long time and can be started at any time. Can be quickly peeled off from the whole surface during unsealing, and does not destroy the original coating.
3. Compared with the protection methods such as a sealed packaging method, a dry air method and the like, the invention has the advantages that the coating area can be made larger, the invention is suitable for large-volume equipment and articles with complex structures, the construction is simple, and the coating layer does not need subsequent maintenance.
4. The sealing protective coating does not release toxic and harmful substances, and solves the problems that the solvent type strippable protective coating contains an organic solvent and the use environment is limited; the solution A and the solution B are mixed to form a film without heating, so that the problems of low self strength, complex coating process, poor stripping effect and the like of the hot-melt strippable protective coating material are solved; the water-based strippable protective coating does not contain moisture, solves the problems that the thickness of the water-based strippable protective coating is limited, the durability is poor, the functions of collision and the like on protective equipment and articles are poor, and meanwhile, the water-based coating is not suitable for protecting equipment such as metal instruments and precise electronic instruments due to the existence of the moisture.
5. The sealing protective coating is a special functional coating, and is a polyurethane functional coating formed by polymerizing high molecular compounds containing various functional groups. The coating is suitable for coating protection of different materials such as metal, plastic, liquid crystal display, glass, wood and the like. The formed coating protective film has high strength, but relatively small adhesive force, can be easily peeled off in a whole piece, and can be used for rapidly unsealing equipment and articles.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
In the embodiment 1, the sealing protective coating comprises a liquid A and a liquid B, wherein the mass ratio of the liquid A to the liquid B is 3:1.
The solution A comprises the following raw materials in parts by weight: 28 parts of polyoxypropylene glycol, 20 parts of polytetrahydrofuran glycol, 10 parts of polycarbonate glycol, 15 parts of polyester diol, 13 parts of toluene diisocyanate and 14 parts of 1, 6-hexamethylene diisocyanate (calculated by 48 parts of polyether polyol, 25 parts of polyester polyol and 27 parts of isocyanate).
The liquid B comprises the following raw materials in parts by weight: 50 parts of hollow microspheres, 5 parts of graphene, 20 parts of amino-terminated polypropylene oxide ether, 8 parts of 1, 4-butanediol, 4 parts of plasticizer, 4 parts of reactive diluent, 1 part of auxiliary agent and 8 parts of flame retardant, wherein the auxiliary agent comprises: 0.5 part of flatting agent, 0.5 part of defoamer (calculated by weight: 55 parts of pigment filler, 20 parts of polyether amine, 8 parts of chain extender, 4 parts of plasticizer, 4 parts of reactive diluent, 1 part of auxiliary agent and 8 parts of flame retardant).
The plasticizer is phthalate plasticizer.
The reactive diluent is a multifunctional reactive diluent.
The flame retardant is aluminum hydroxide or magnesium hydroxide flame retardant.
The leveling agent is an organosilicon leveling agent, and specifically is a polyether modified organosilicon leveling agent or a polyester modified organosilicon leveling agent.
The defoaming agent is an organosilicon defoaming agent, and specifically is a polydimethylsiloxane defoaming agent.
The preparation method comprises the following steps:
(1) The polyoxypropylene glycol, the polytetrahydrofuran glycol, the polycarbonate glycol and the polyester diol are weighed and then put into a heating container, stirred at 70rpm and heated to 150 ℃, and the temperature in the heating container is reduced to room temperature after heat preservation for 1 h.
(2) The weighed toluene diisocyanate and 1, 6-hexamethylene diisocyanate are added into a container of the step (1), stirred at 150rpm and heated to 80 ℃, and kept for 2 hours to obtain a solution A.
(3) Adding the weighed hollow microspheres, graphene, amino-terminated polyoxypropylene ether and 1, 4-butanediol into a new heating container, and fully stirring and dispersing at 600rpm for 30min;
(4) Adding a plasticizer, a reactive diluent, a leveling agent, a defoaming agent, a wetting agent and a flame retardant into the container in the step (3), fully stirring and dispersing at 1600rpm, continuously dispersing for 30min, grinding, and filtering by a 200-mesh filter screen to obtain a liquid B.
(5) And uniformly mixing the solution A and the solution B in a ratio of 3:1, coating the mixture on the surface of a sample plate, and curing to obtain a coating formed by the sealing protective coating.
In the embodiment 2, the sealing protective coating comprises a liquid A and a liquid B, wherein the mass ratio of the liquid A to the liquid B is 5:1.
The solution A comprises the following raw materials in parts by weight: 12 parts of polyoxypropylene glycol, 8 parts of tetrahydrofuran-oxypropylene copolymer glycol, 12 parts of polycaprolactone polyol, 18 parts of polycarbonate diol, 23 parts of diphenylmethane diisocyanate and 27 parts of 1, 6-hexamethylene diisocyanate (calculated by 20 parts of polyether polyol, 30 parts of polyester polyol and 50 parts of isocyanate).
The liquid B comprises the following raw materials in parts by weight: 5 parts of silicon dioxide aerogel, 12 parts of hollow microspheres, 8 parts of graphene, 35 parts of amino-terminated polyoxypropylene ether, 11 parts of 1, 6-hexanediol, 9 parts of trimethylolpropane, 3 parts of plasticizer, 8 parts of reactive diluent, 4 parts of auxiliary agent and 5 parts of flame retardant, wherein the auxiliary agent comprises: 2 parts of flatting agent, 0.5 part of defoaming agent, 1.5 parts of wetting agent (calculated by 25 parts of pigment filler, 35 parts of polyether amine, 20 parts of chain extender, 3 parts of plasticizer, 8 parts of reactive diluent, 4 parts of auxiliary agent and 5 parts of flame retardant).
The plasticizer is phthalate plasticizer.
The reactive diluent is a multifunctional reactive diluent.
The flame retardant is aluminum hydroxide or magnesium hydroxide flame retardant.
The leveling agent is an organosilicon leveling agent, and specifically is a polyether modified organosilicon leveling agent or a polyester modified organosilicon leveling agent.
The defoaming agent is an organosilicon defoaming agent, and specifically is a polydimethylsiloxane defoaming agent.
The wetting agent is a wetting dispersion type wetting agent.
The preparation method comprises the following steps:
(1) The polypropylene oxide glycol, the tetrahydrofuran-propylene oxide copolymer glycol, the polycaprolactone polyol and the polycarbonate diol are weighed and then put into a heating container, stirred at 70rpm and heated to 100 ℃, and the temperature in the heating container is reduced to room temperature after 2 hours of heat preservation.
(2) And (3) adding the weighed diphenylmethane diisocyanate and 1, 6-hexamethylene diisocyanate into the container in the step (1), stirring at 150rpm, heating to 60 ℃, and maintaining for 2 hours to obtain the solution A.
(3) Adding the weighed silicon dioxide aerogel, hollow microspheres, graphene, amino-terminated polypropylene oxide ether and 1, 4-butanediol into a new heating container, and fully stirring and dispersing at 600rpm for 30min;
(4) Adding the weighed plasticizer, reactive diluent, flatting agent, defoamer, wetting agent and flame retardant into the container in the step (3), fully stirring and dispersing at 1600rpm, grinding after continuously dispersing for 30min, and filtering by a 200-mesh filter screen to obtain the liquid B.
(5) And uniformly mixing the solution A and the solution B in a ratio of 5:1, coating the mixture on the surface of a sample plate, and curing to obtain a coating formed by the sealing protective coating.
The embodiment 3 is a sealing protective coating, which comprises a liquid A and a liquid B, wherein the mass ratio of the liquid A to the liquid B is 8:1.
The solution A comprises the following raw materials in parts by weight: 25 parts of polytetrahydrofuran glycol, 35 parts of tetrahydrofuran-propylene oxide copolymer glycol, 13 parts of polycaprolactone polyol, 7 parts of polyester diol, 10 parts of toluene diisocyanate and 10 parts of diphenylmethane diisocyanate (calculated by 60 parts of polyether polyol, 20 parts of polyester polyol and 20 parts of isocyanate).
The liquid B comprises the following raw materials in parts by weight: 5 parts of silicon dioxide aerogel, 10 parts of hollow microspheres, 8 parts of titanium dioxide, 6 parts of graphene, 8 parts of amino-terminated polypropylene oxide ether, 7 parts of amino-terminated polyethylene oxide ether, 12 parts of 1, 4-butanediol, 13 parts of trimethylolpropane, 8 parts of plasticizer, 3 parts of reactive diluent, 5 parts of auxiliary agent and 15 parts of flame retardant, wherein the auxiliary agent comprises: 2 parts of flatting agent, 1 part of defoamer, 2 parts of wetting agent (calculated by weight: 29 parts of pigment filler, 15 parts of polyether amine, 25 parts of chain extender, 8 parts of plasticizer, 3 parts of reactive diluent, 5 parts of auxiliary agent and 15 parts of flame retardant).
The plasticizer is phthalate plasticizer.
The reactive diluent is a multifunctional reactive diluent.
The flame retardant is aluminum hydroxide or magnesium hydroxide flame retardant.
The leveling agent is an organosilicon leveling agent, and specifically is a polyether modified organosilicon leveling agent or a polyester modified organosilicon leveling agent.
The defoaming agent is an organosilicon defoaming agent, and specifically is a polydimethylsiloxane defoaming agent.
The wetting agent is a wetting dispersion type wetting agent.
The preparation method comprises the following steps:
(1) Weighing polytetrahydrofuran glycol, tetrahydrofuran-propylene oxide copolymer glycol, polycaprolactone polyol and polyester diol, putting into a heating container, stirring at 70rpm, heating to 180 ℃, preserving heat for 1h, and cooling the temperature in the heating container to room temperature.
(2) And (3) adding the weighed toluene diisocyanate and diphenylmethane diisocyanate into the container in the step (1), stirring at 150rpm, heating to 60 ℃, and maintaining for 2 hours to obtain solution A.
(3) Adding the weighed silica aerogel, hollow microspheres, titanium dioxide, graphene, amino-terminated polypropylene oxide ether, amino-terminated polyethylene oxide ether, 1, 4-butanediol and trimethylolpropane into a new heating container, and fully stirring and dispersing at 600rpm for 30min;
(4) Adding the weighed plasticizer, reactive diluent, flatting agent, defoamer, wetting agent and flame retardant into the container in the step (3), fully stirring and dispersing at 1600rpm, grinding after continuously dispersing for 30min, and filtering by a 200-mesh filter screen to obtain the liquid B.
(5) And uniformly mixing the solution A and the solution B in a ratio of 8:1, coating the mixture on the surface of a sample plate, and curing to obtain a coating formed by the sealing protective coating.
Comparative example 1, commercially available JEK-205 acrylic polyurethane topcoat, which is prepared from aliphatic polyurethane, hydroxyl-containing synthetic resin, pigment filler, auxiliary agent, solvent, etc., is a common weatherable topcoat.
Comparative example 2 the release coating raw material of comparative example 2 comprises the following parts by weight:
The formula is an aqueous strippable coating, the stripping strength is smaller than that of examples 1-3, but the elongation at break is smaller than that of examples 1-3, so that the coating is brittle, has no higher ductility, flexibility and plasticity, and is easy to break under the action of larger pulling force.
The preparation method of the water-based strippable coating comprises the following steps:
(1) Deionized water and aqueous polyurethane resin are sequentially put into a reaction kettle, the stirring speed is adjusted to be 100-200 rpm, and the stirring is continued for 5-15 min;
(2) Putting the cosolvent into a reaction kettle, and continuously stirring for 1-5 min at the stirring speed of 100-200 rpm;
(3) Adding a pH value regulator into a reaction kettle, regulating the pH value of the solution to 7.5-8.5, regulating the stirring speed to 300-500 rpm, and continuously stirring for 5-10 min;
(4) Adding a wetting agent, a defoaming agent, a thickening agent and a stripping accelerator into a reaction kettle, adjusting the stirring speed to 500-800 rpm, and continuously stirring for 10-20 min; and filtering to obtain the final product.
Example 4
The coatings obtained in examples 1 to 3 were subjected to performance test and compared with comparative examples 1 and 2, and the results are shown in table 1.
TABLE 1
In the polyether polyols of the liquid A according to the invention, the main chain contains ether bonds (-R-O-R-), and the end groups or side groups contain more than 2 hydroxyl groups (-OH).
The polyester polyol contains more polar groups such as ester groups, amino groups and the like in the molecule, has strong cohesive strength and adhesive force, and has higher strength and wear resistance.
Isocyanates include monoisocyanates (R-n=c=o) and diisocyanates (o=c=n-R-n=c=o). The isocyanate structure contains unsaturated bond, so that the isocyanate has high activity and is easy to react with organic or inorganic matters with active groups (such as hydroxyl, amino, carboxyl and the like).
The polyether amine in the solution B is a polymer with a main chain of a polyether structure and an amine group as a terminal active functional group, the amine group provides possibility for the polyether amine to react with various compounds, and the special molecular structure of the polyether amine enables the polyether amine to have excellent comprehensive performance. The chain extender is a low molecular weight multifunctional compound containing hydroxyl or amino, and reacts with polyetheramine to form a bridge between molecular chains, so that the molecular chains are extended by diffusion, the molecular weight is increased, and the viscosity of the system is improved.
The aerogel in the solution B is a high-dispersion solid nanoscale material which is formed by mutually agglomerating colloid particles or high polymer molecules to form a nano porous network structure and is filled with gaseous dispersion media in pores, and has the characteristics of low heat conductivity coefficient, low density, high porosity, large specific surface area and the like. In the manufacturing process, the liquid silicon compound is mixed with the liquid solvent which volatilizes rapidly to form gel, and then the gel is subjected to measures such as temperature rise and pressure in a pressure container, so that the liquid in the gel is discharged, and the low-density aerogel material which is porous, disordered and has a nano-level continuous network structure can be obtained.
Specifically, the hollow microsphere has the characteristics of light specific gravity, lipophilicity, good fluidity, heat insulation, sound insulation, low oil absorption rate and the like, and is used as a closed hollow sphere to form a microscopic independent heat insulation cavity, so that the heat insulation property of the coating to heat is effectively improved.
Titanium dioxide can highly reflect the infrared radiation (the main heat source) of sunlight, and prevent the heat of the sun from accumulating and heating up on the surface of the coating. By adding the heat insulation filler, the heat insulation effect of the coating can be effectively improved.
After the graphene is subjected to oxidation treatment, the graphene oxide still maintains the layered structure of graphite, and as a novel carbon material with excellent performance, the novel carbon material has higher specific surface area and rich surface functional groups, and the lamellar graphene oxide can not only improve the mechanical property, corrosion resistance and the like of the coating, but also reduce the surface energy of the coating, improve the application effect and enable the coating to be easily and rapidly stripped.
The chain extender is also called a chain extender, and can be used for expanding a molecular chain and increasing the molecular weight through reaction, so that the mechanical property and the technological property of a product can be improved, the extensibility is ensured, and meanwhile, a certain tensile strength is given to the coating.
The plasticizer is used as an auxiliary agent of the high polymer material, so that the performance of the high polymer material can be effectively improved, and the flexibility of the coating is enhanced.
The reactive diluent is a substance with epoxy functional groups in a molecular structure, can dissolve or disperse a film-forming substance, can participate in a film-forming reaction in the film-forming process of the coating, forms nonvolatile components which are remained in a coating film, keeps the performance of the coating, and can play a role in toughening.
After the solution A and the solution B are mixed, amino groups in the material react with isocyanate groups to form polyurea coating, and the polyurea coating has excellent performance.
The lamellar graphene oxide filler can not only improve the mechanical property, corrosion resistance and the like of the coating, but also reduce the surface energy of the coating, improve the application effect and enable the coating to be easily and rapidly stripped.
The sealing protective coating is a special functional coating, and is a polyurethane functional coating formed by polymerizing high molecular compounds containing various functional groups. The coating is suitable for coating protection of different materials such as metal, plastic, liquid crystal display, glass, wood and the like.
The coating can be coated on the surfaces of the protected equipment and articles to quickly dry cocoons to form a layer of flexible, compact and continuous coating film, can isolate the direct contact of mediums such as water, air, salt mist and the like with the protected equipment and articles, has the protection effects of preventing dirt, stains, rust, ultraviolet rays, high and low temperature, harmful substances and the like on the protected equipment and articles, and ensures that the protected equipment and articles can be stably sealed for a long time and started at any time. Can be quickly peeled off from the whole surface during unsealing, and does not destroy the original coating.
The sealing protective coating solves the problems that the solvent type strippable protective coating contains an organic solvent and the use environment is limited; solves the problems of low self strength, complex coating process, poor stripping effect and the like of the hot-melt strippable protective coating material; the problems that the thickness of the water-based strippable protective coating is limited, the durability is poor, the functions of collision and the like on protective equipment and articles are poor, and meanwhile, the water-based coating is not suitable for protecting equipment such as metal instruments and precise electronic instruments due to the existence of water are solved.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The sealing protective coating is characterized by comprising the following components: the liquid comprises a liquid A and a liquid B, wherein the mass ratio of the liquid A to the liquid B is 3:1-8:1;
The solution A comprises the following raw materials in parts by weight: 20-60 parts of polyether polyol, 20-30 parts of polyester polyol and 20-50 parts of isocyanate;
the liquid B comprises the following raw materials in parts by weight: 25-55 parts of pigment filler, 15-35 parts of polyether amine, 8-25 parts of chain extender, 3-8 parts of plasticizer, 3-8 parts of reactive diluent, 1-5 parts of auxiliary agent and 5-15 parts of flame retardant;
The pigment and filler comprises hollow microspheres and graphene; the amount of the hollow microspheres is more than or equal to 10 parts, and the amount of the graphene is more than or equal to 5 parts.
The auxiliary agent comprises one or more of a leveling agent, a defoaming agent and a wetting agent.
2. The seal protective coating of claim 1, wherein the polyether polyol comprises: one or more of polyoxypropylene glycol, polytetrahydrofuran glycol and tetrahydrofuran-propylene oxide copolymer glycol;
preferably, the polyester polyol comprises: one or more of polycaprolactone polyol, polycarbonate diol and polyester diol;
preferably, the isocyanate comprises: toluene diisocyanate, diphenylmethane diisocyanate, 1, 6-hexamethylene diisocyanate.
3. The seal protective coating of claim 1, wherein the polyetheramine comprises: one or more of amino-terminated polyoxypropylene ether and amino-terminated polyoxyethylene ether;
Preferably, the chain extender comprises: one or more of 1, 4-butanediol, 1, 6-hexanediol and trimethylolpropane;
Preferably, the plasticizer is a phthalate plasticizer;
preferably, the reactive diluent is a multifunctional reactive diluent;
Preferably, the flame retardant is an aluminum hydroxide or magnesium hydroxide flame retardant;
preferably, the leveling agent is an organosilicon leveling agent;
Preferably, the defoaming agent is an organosilicon defoaming agent;
Preferably, the wetting agent is a wetting dispersion type wetting agent.
4. A seal coat as claimed in claim 3, wherein,
The leveling agent is a polyether modified organic silicon leveling agent or a polyester modified organic silicon leveling agent;
The defoaming agent is polydimethylsiloxane defoaming agent.
5. The sealing protective coating as claimed in claim 1, wherein the hollow microspheres are ceramic hollow microspheres and/or glass hollow microspheres, the particle size is 60-120 μm, and the crushing strength is more than 15MPa;
The ceramic hollow microspheres are made of one or more of aluminum oxide, aluminum oxide-silicon oxide, silicon carbide and boron carbide, or modified materials based on the aluminum oxide, the aluminum oxide-silicon oxide, the silicon carbide and the boron carbide;
The hollow glass microspheres are made of aluminosilicate glass or modified materials based on aluminosilicate glass;
The graphene is graphene oxide.
6. The seal coat of claim 1, wherein silica aerogel and/or titania is added to the pigment filler.
7. The seal protective coating of claim 6 wherein the silica aerogel has a particle size of 10 to 30 μm and a void diameter of 20 to 50nm;
the titanium dioxide is as follows: the solar reflectance of the rutile type titanium dioxide subjected to aluminum surface modification is more than or equal to 80 percent.
8. A method of preparing a barrier coating as claimed in any one of claims 1 to 7, comprising:
Weighing polyether polyol and polyester polyol, putting the weighed polyether polyol and polyester polyol into a container, stirring and heating the mixture to 100-180 ℃, preserving heat for 1-2 hours, and then cooling the temperature in the heated container to room temperature; adding isocyanate into the solution, stirring, heating to 60-90 ℃, and preserving heat for 1-2 hours to obtain solution A;
weighing pigment and filler, polyether amine and chain extender, adding into a container, stirring and dispersing fully, adding plasticizer, reactive diluent, auxiliary agent and flame retardant, stirring and dispersing fully, grinding by wet method, and filtering by a 100-400 mesh filter screen to obtain solution B;
And (5) packaging and storing the solution A and the solution B respectively, and mixing the solutions together when in use.
9. The method of preparing as claimed in claim 8, wherein:
Weighing polyether polyol and polyester polyol, putting into a container, stirring and heating to 150 ℃, preserving heat for 1h, and cooling to room temperature; and adding isocyanate, stirring and heating to 80 ℃, and maintaining for 2 hours to obtain solution A.
10. Use of a sealing protective coating according to any of claims 1 to 7 and/or a method of preparation according to any of claims 8 to 9 for sealing protection of equipment and objects,
The sealing protective coating is used on the surfaces of equipment and articles in a spraying, brushing or roller coating mode to form a layer of sealed protective film;
When the equipment and the articles are unsealed for use, the protective film is removed in a tearing and peeling mode.
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