CN110396331B - Recoatable flexible fluorocarbon coating - Google Patents
Recoatable flexible fluorocarbon coating Download PDFInfo
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- CN110396331B CN110396331B CN201910805867.7A CN201910805867A CN110396331B CN 110396331 B CN110396331 B CN 110396331B CN 201910805867 A CN201910805867 A CN 201910805867A CN 110396331 B CN110396331 B CN 110396331B
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- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 title claims abstract description 67
- 238000000576 coating method Methods 0.000 title claims abstract description 48
- 239000011248 coating agent Substances 0.000 title claims abstract description 43
- 239000011347 resin Substances 0.000 claims abstract description 32
- 229920005989 resin Polymers 0.000 claims abstract description 32
- 239000010456 wollastonite Substances 0.000 claims abstract description 15
- 229910052882 wollastonite Inorganic materials 0.000 claims abstract description 15
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 14
- 239000000843 powder Substances 0.000 claims abstract description 13
- 239000000080 wetting agent Substances 0.000 claims abstract description 12
- 239000000758 substrate Substances 0.000 claims abstract description 11
- 239000013638 trimer Substances 0.000 claims description 11
- 239000005056 polyisocyanate Substances 0.000 claims description 10
- 229920001228 polyisocyanate Polymers 0.000 claims description 10
- 239000000126 substance Substances 0.000 claims description 10
- 239000002270 dispersing agent Substances 0.000 claims description 9
- 239000004611 light stabiliser Substances 0.000 claims description 9
- 239000002904 solvent Substances 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 6
- 239000005057 Hexamethylene diisocyanate Substances 0.000 claims description 5
- 239000002518 antifoaming agent Substances 0.000 claims description 5
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical group O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 claims description 5
- 239000012948 isocyanate Substances 0.000 claims description 4
- 150000002513 isocyanates Chemical class 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 239000013008 thixotropic agent Substances 0.000 claims description 3
- UUEWCQRISZBELL-UHFFFAOYSA-N 3-trimethoxysilylpropane-1-thiol Chemical compound CO[Si](OC)(OC)CCCS UUEWCQRISZBELL-UHFFFAOYSA-N 0.000 claims description 2
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 2
- QYKIQEUNHZKYBP-UHFFFAOYSA-N Vinyl ether Chemical compound C=COC=C QYKIQEUNHZKYBP-UHFFFAOYSA-N 0.000 claims description 2
- 239000000654 additive Substances 0.000 claims description 2
- 238000012648 alternating copolymerization Methods 0.000 claims description 2
- UUAGAQFQZIEFAH-UHFFFAOYSA-N chlorotrifluoroethylene Chemical group FC(F)=C(F)Cl UUAGAQFQZIEFAH-UHFFFAOYSA-N 0.000 claims description 2
- 229920001577 copolymer Polymers 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 229920000570 polyether Polymers 0.000 claims description 2
- 239000012752 auxiliary agent Substances 0.000 claims 2
- 239000000945 filler Substances 0.000 claims 2
- 239000000049 pigment Substances 0.000 claims 2
- 239000003973 paint Substances 0.000 abstract description 19
- 239000006087 Silane Coupling Agent Substances 0.000 abstract description 2
- 150000001875 compounds Chemical class 0.000 abstract description 2
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 15
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 15
- 238000000034 method Methods 0.000 description 14
- 229910000831 Steel Inorganic materials 0.000 description 12
- 238000002360 preparation method Methods 0.000 description 12
- 239000010959 steel Substances 0.000 description 12
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 10
- 238000012360 testing method Methods 0.000 description 9
- 239000013530 defoamer Substances 0.000 description 8
- YXRKNIZYMIXSAD-UHFFFAOYSA-N 1,6-diisocyanatohexane Chemical compound O=C=NCCCCCCN=C=O.O=C=NCCCCCCN=C=O.O=C=NCCCCCCN=C=O YXRKNIZYMIXSAD-UHFFFAOYSA-N 0.000 description 7
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 7
- 238000009736 wetting Methods 0.000 description 5
- 239000008096 xylene Substances 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 229910021485 fumed silica Inorganic materials 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000032683 aging Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 238000005536 corrosion prevention Methods 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 239000004408 titanium dioxide Substances 0.000 description 3
- 239000002966 varnish Substances 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 229920002725 thermoplastic elastomer Polymers 0.000 description 2
- 239000004636 vulcanized rubber Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- SVONRAPFKPVNKG-UHFFFAOYSA-N 2-ethoxyethyl acetate Chemical compound CCOCCOC(C)=O SVONRAPFKPVNKG-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 description 1
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- MOUPNEIJQCETIW-UHFFFAOYSA-N lead chromate Chemical compound [Pb+2].[O-][Cr]([O-])(=O)=O MOUPNEIJQCETIW-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D127/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers
- C09D127/02—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
- C09D127/12—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/16—Antifouling paints; Underwater paints
- C09D5/1656—Antifouling paints; Underwater paints characterised by the film-forming substance
- C09D5/1662—Synthetic film-forming substance
- C09D5/1668—Vinyl-type polymers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/16—Antifouling paints; Underwater paints
- C09D5/1687—Use of special additives
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Paints Or Removers (AREA)
Abstract
The invention discloses a recoatable flexible fluorocarbon coating which is an A and B two-component system, wherein a low-Tg flexible fluorocarbon resin system is adopted, the ratio of soft and hard curing agent components is adjusted, and the components react to form an interpenetrating network structure with soft and hard chain segments staggered after curing, so that the flexibility of a paint film of film-forming resin is improved; by adding the acicular wollastonite powder treated by the silane coupling agent, the wettability of fluorocarbon resin to powder is improved, the mechanical impact resistance of the cured paint film enhanced coating is enhanced, and cracks are reduced; the re-coating property of the fluorocarbon coating is improved by using the compound of the substrate wetting agent, and the comprehensive application performance of the coating is improved.
Description
Technical Field
The invention relates to the technical field of surface protection, in particular to a recoatable flexible fluorocarbon coating.
Background
The construction and improvement of high-speed rail and highway networks in China are changing the travel habits and activity laws of Chinese residents, bringing ultra-large-scale social and economic benefits, and meanwhile, large-span steel structure bridges such as suspension bridges, cable-stayed bridges, arch bridges and the like are produced at the same time; due to the characteristics of large flexibility, small rigidity and damping, low fundamental frequency and long period of the large-span steel bridge structure, radial and axial relative deformation occurs under the action of wind load and vibration generated in the vehicle passing process; fluorocarbon coatings are increasingly applied to the field of outdoor steel bridge corrosion prevention due to excellent weather resistance, and particularly for severe marine corrosion environments, the fluorocarbon coatings show an increasingly important position, but conventional fluorocarbon coatings are generally higher in rigidity and poorer in adaptability to steel bridges which are easy to deform, and due to the low surface energy characteristic of fluorocarbon resin, the fluorocarbon coatings are poor in recoatability and cannot completely meet the assembly process requirements of the modern bridge industry.
Chinese patent CN105419602B discloses a normal temperature curing fluorocarbon coating for corrosion prevention and a preparation method thereof, wherein a film forming system of FEVE fluorocarbon resin and isocyanate curing agent is adopted, and the composite effect of nano titanium dioxide and nano cerium dioxide is utilized to further improve the weather resistance of the fluorocarbon coating, so that the fluorocarbon coating can be better applied to the corrosion prevention protection of railway concrete structures and steel structure surfaces in harsh environment, but the fluorocarbon coating is difficult to adapt to the deformation of steel bridges, and the coating is easy to crack at the deformation positions of the steel bridges, loses the protection benefit and causes the steel bridges to be corroded and damaged.
Disclosure of Invention
The invention aims to overcome the defects that the conventional fluorocarbon coating in the prior art is generally high in rigidity and poor in adaptability to steel bridges which are easy to deform, and the fluorocarbon coating is easy to crack at the deformed positions of the steel bridges in the using process and lose the protection benefit, so that the steel bridges are corroded and damaged, and provides the recoatable flexible fluorocarbon coating.
In order to achieve the above purpose, the invention provides the following technical scheme:
a recoatable flexible fluorocarbon coating is a two-component system of A and B, and 100 parts by mass of the coating comprises:
the component A comprises:
and B component: 1.5-2 parts of polyisocyanate trimer
10.3 to 12.1 parts of elastic curing agent
2-3 parts of a component B solvent;
the fluorocarbon resin is FEVE fluorocarbon resin with low Tg (glass transition temperature) and alternating copolymerization structure of chlorotrifluoroethylene and vinyl ether, the Tg value is less than or equal to 20 ℃, the solid content of the fluorocarbon resin accounts for 50 percent of the fluorocarbon resin, the content of the solid content of the fluorocarbon resin in dry film mass is more than or equal to 43 percent, and other additives comprise one or more of thixotropic agent, defoaming agent, dispersing agent and light stabilizer.
Preferably, the fluorocarbon resin is LF600X resin.
Preferably, the fluorocarbon coating comprises 100 parts by mass of:
the component A comprises:
and B component: 1.6-1.8 parts of polyisocyanate trimer
9.4 to 11.2 parts of elastic curing agent
And 2.4-2.9 parts of a component B solvent.
Preferably, the polyisocyanate trimer is Hexamethylene Diisocyanate (HDI) trimer with a solid content of 90% or more.
Preferably, the elastic curing agent is an aliphatic polyisocyanate composed of Hexamethylene Diisocyanate (HDI) and having NCO (isocyanate) content of 8% or less.
Preferably, the mass ratio of the elastic curing agent to the polyisocyanate trimer is 1.8-3.4: 1.
Preferably, the substrate wetting agent is a polyether siloxane copolymer.
Preferably, the modified wollastonite is acicular wollastonite powder modified by 3-mercaptopropyltrimethoxysilane.
Further preferably, the acicular wollastonite powder has a particle size of 1250 mesh.
Preferably, the isocyanate index in the two-component system is 1.07 to 1.11.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
the recoatable flexible fluorocarbon coating adopts a low-Tg flexible fluorocarbon resin system, adjusts the component proportion of soft and hard curing agents, and reacts after curing to form an interpenetrating network structure with soft and hard chain segments staggered, so that the flexibility of a paint film of the film-forming resin is improved; by adding the acicular wollastonite powder treated by the silane coupling agent, the wettability of fluorocarbon resin to powder is improved, the mechanical impact resistance of the cured paint film enhanced coating is enhanced, and cracks are reduced; the re-coating property of the fluorocarbon coating is improved by using the compound of the substrate wetting agent, and the comprehensive application performance of the coating is improved; the fluorocarbon coating has excellent weather resistance, chemical stability, water resistance and stain resistance, the preparation process is simple, the construction is convenient, the tensile strength is high, the elongation at break can reach more than 180%, the light retention rate after resisting artificial weather aging for 6000 hours is more than 80%, the weather resistance is excellent, the product has good self-recoatability, the conventional recoatability window time reaches 7-14 days, and the recoatability flexible fluorocarbon coating can meet the use requirements of long service life, deformation resistance and overlong recoatability period in the actual use of a super-span steel bridge.
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. It should be understood that the scope of the above-described subject matter is not limited to the following examples, and any techniques implemented based on the disclosure of the present invention are within the scope of the present invention.
Example 1
The recoatable flexible fluorocarbon coating is a two-component system A and B.
The component A comprises: adding 47.2Kg of fluorocarbon resin (AGC company LF600X) and 4.8Kg of butyl acetate into a mixing tank, adding 1.63Kg of thixotropic agent (degussa R972), and dispersing at high speed of 800R/min for 20min to be uniform;
adding 0.23Kg of dispersing agent (digao 610s) at the rotating speed of 500R/min, sequentially adding 13.8Kg of rutile titanium dioxide (R818), 0.5Kg of carbon black (N660), 1Kg of medium chrome yellow and 1.4Kg of treated modified wollastonite powder after dispersing for 10min, dispersing for 30min, and grinding to the fineness of less than 30 μm;
0.36Kg of a substrate wetting agent (digao 450), 0.23Kg of a defoaming agent (merck MOK6021), 0.64Kg of a light stabilizer (Ciba refinement 5151) and the rest of a butyl acetate solvent were added and dispersed at a rotation speed of 600r/min for 20min to be uniform, to obtain a component A.
And B component: 3Kg of butyl acetate, 1.9Kg of HDI trimer (Bayer 3390) and 12Kg of an elastomeric curing agent (Asahi chemical E402-90T) were added to a mixing bowl and dispersed uniformly at a rotation speed of 500r/min to obtain component B.
Example 2
The recoatable flexible fluorocarbon coating is a two-component system A and B.
The component A comprises: the preparation method comprises 51.5Kg of fluorocarbon resin (AGC company LF600X), 13.2Kg of rutile titanium dioxide (R818), 0.2Kg of carbon black (N660), 1.3Kg of treated modified wollastonite powder, 1.5Kg of bentonite (BP-183B), 0.2Kg of dispersant (digao 628), 0.2Kg of defoamer (merck MOK6021), 0.62Kg of light stabilizer (Ciba refinement 5151), 0.34Kg of substrate wetting agent (digao Wet KL 245), 6Kg of butyl acetate and 9Kg of xylene, and is the same as in example 1.
And B component: comprising 10.9Kg of an elastomer curing agent (Asahi chemical E405-80T), 1.8Kg of HDI trimer (Pasteur HI 190B/S) and 2.9Kg of butyl acetate, was prepared in the same manner as in example 1.
Example 3
The recoatable flexible fluorocarbon coating is a two-component system A and B.
The component A comprises: the process includes 53.6Kg fluorocarbon resin (AGC company LF600X), 12.4Kg rutile titanium dioxide (R962), 1.2Kg modified wollastonite powder after treatment, 10Kg ultra-dispersed rheology assistant (hamming moded change 1828), 1.4Kg wetting dispersant (bike byk163), 0.21Kg defoamer (basf evaf ka EFKA2722), 0.57Kg light stabilizer (vapour parkerization 5151), 0.32Kg substrate wetting agent (digogo 450), 5Kg butyl acetate, 7.8Kg xylene, 1.2Kg ethylene glycol ethyl ether acetate, and the preparation method is the same as example 1.
And B component: including 10.3Kg of elastomeric curative (Asahi chemical E402-90T), 1.7Kg of HDI trimer (Pasteur HI 190B/S), and 2.6Kg of butyl acetate, was prepared in the same manner as in example 1.
Example 4
The recoatable flexible fluorocarbon coating is a two-component system A and B.
The component A comprises: the preparation method comprises 56.2Kg of fluorocarbon resin (AGC company LF600X), 11.4Kg of rutile titanium dioxide, 1.1Kg of treated modified wollastonite powder, 1.3Kg of fumed silica (R972), 0.18Kg of wetting dispersant (digao 610s), 0.14Kg of defoamer (Pasteur Effa EFKA2722), 0.28Kg of substrate wetting agent (Clariant UD505), 0.19Kg of defoamer (Merck MOK6021), 0.51Kg of light stabilizer (Pasteur 5060), 5Kg of butyl acetate and 7.5Kg of xylene, and is the same as example 1.
And B component: including 11.2Kg of elastomeric curative (Asahi chemical E402-90T), 1.6Kg of HDI trimer (Bayer 3390), and 2.4Kg of butyl acetate, the preparation method was the same as in example 1.
Example 5
The recoatable flexible fluorocarbon coating is a two-component system A and B.
The component A comprises: the preparation method comprises 58.3Kg of fluorocarbon resin (AGC company LF600X), 10.1Kg of titanium dioxide, 1.0Kg of treated modified wollastonite powder, 1.2Kg of fumed silica (R972), 0.17Kg of wetting dispersant (digao 610s), 0.13Kg of defoamer (Pasteur Effka EFKA2722), 0.17Kg of defoamer (merck MOK6021), 0.26Kg of substrate wetting agent (digao Wet505), 0.47Kg of light stabilizer (UV-9), 4.5Kg of butyl acetate and 11.4Kg of xylene, and is the same as in example 1.
And B component: including 13Kg of elastomeric curative (Asahi chemical E405-80T), 1.5Kg of HDI trimer (Bayer 3390), and 2.2Kg of butyl acetate, the preparation method was the same as in example 1.
Comparative example 1
A fluorocarbon paint is composed of A, B components.
The component A comprises: the preparation method comprises 25.5Kg of fluorocarbon resin (AGC company LF600X), 16.9Kg of titanium dioxide, 1.77Kg of fumed silica (R972), 0.26Kg of wetting dispersant (digao 610s), 0.2Kg of defoaming agent (Pasteur Effka EFKA2722), 0.26Kg of defoaming agent (Merck MOK6021), 0.71Kg of light stabilizer (UV-9), 6.9Kg of butyl acetate and 10.3Kg of dimethylbenzene, and is the same as the preparation method of the example 1.
And B component: including 4.0Kg of elastomeric curative (Asahi chemical E402-90T), 1.7Kg of HDI trimer (Bayer 3390), and 3.4Kg of butyl acetate, the preparation method was the same as in example 1.
Comparative example 2
A fluorocarbon paint is composed of A, B components.
The component A comprises: the preparation method comprises 48.9Kg of fluorocarbon resin (AGC company LF600X), 15.8Kg of titanium dioxide, 1.6Kg of fumed silica (R972), 0.24Kg of wetting dispersant (digao 610s), 0.24Kg of defoamer (Pasteur Effka EFKA2722), 0.18Kg of defoamer (Merck MOK6021), 0.36Kg of substrate wetting agent (digao Wet505), 0.66Kg of light stabilizer (UV-9), 6.4Kg of butyl acetate and 9.6Kg of xylene, and is the same as in example 1.
And B component: including 10.4Kg of elastomeric curative (Asahi chemical E402-90T), 1.1Kg of HDI trimer (Pasteur HI 190B/S), and 3.1Kg of butyl acetate, was prepared in the same manner as in example 1.
Performance testing
The flexible coatings prepared in examples 1 to 5 and comparative examples 1 to 2 were subjected to a performance test.
The obtained product was uniformly coated on a substrate, dried at 25 ℃ for 2 hours to surface dryness, then placed in an oven at 80 ℃ for 2 hours, completely dried, taken out, and subjected to performance index test according to the following test method, and the test results are shown in table 1.
Impact strength: measured according to the Chinese national standard GB/T1732-1993 'paint film impact resistance measuring method'.
Flexibility: the flexibility is determined according to the Chinese national standard GB/T1731-1993 paint film flexibility determination method.
Elongation at break: the paint film is required to be made into a free film with the thickness of not less than 100 mu m, and after drying, the paint film is cut into a dumbbell shape specified in GB/T528-2009 determination of tensile stress strain property of vulcanized rubber or thermoplastic rubber, and the dumbbell shape is measured by a testing machine with the moving speed of 50 mm/min.
Tensile strength: the paint film is required to be made into a free film with the thickness of not less than 100 mu m, and after drying, the paint film is cut into a dumbbell shape specified in GB/T528-2009 determination of tensile stress strain property of vulcanized rubber or thermoplastic rubber, and the dumbbell shape is measured by a testing machine with the moving speed of 50 mm/min.
Salt water resistance, alkali resistance and acid resistance: the method is carried out according to the regulation of the first method (soaking method) of the Chinese national standard GB/T9274-1988 determination of liquid-resistant media of colored paint and varnish.
Paint film adhesion (pull-open method): the method is carried out according to the regulations of Chinese national standard GB/T5210-2006 adhesion test by color paint and varnish pulling method.
Light aging resistance: the method is carried out according to the standard fluorescent ultraviolet ray/condensation test method of the plastic, paint and rubber material artificial climate aging test method fluorescent ultraviolet lamp for mechanical industrial products of the Chinese national standard GB/T14522-2008, and a UVB light source is adopted, wherein the illumination and condensation period is 4 hours of illumination and 4 hours of condensation.
Recoatability: and testing and evaluating according to the Chinese national standard GB/T34681 and 2017 'determination of matching property and recoatability of colored paint and varnish coating'.
TABLE 1 results of Performance test
As shown in the table above, the overall performance of the fluorocarbon coating prepared in the examples 1-5 of the present invention is better than that of the fluorocarbon coating prepared in the comparative examples 1-2, wherein the overall performance in the example 3 is the best; comparative example 1 the content of the flexible fluorocarbon resin in the dry film is less than 43 percent, which causes the overall brittleness of the paint film, the elongation at break only reaches 80 percent, and the deformation resistance is insufficient; in the comparative example 2, the flexible fluorocarbon resin accounts for 45% of the mass content of the dry film, but the mass ratio of the elastic curing agent to the polyisocyanate trimer is more than 3.4:1, which reaches 4: 1. the paint film is too soft, the elongation at break index is high, the adhesive force is insufficient, the long-acting application requirement cannot be met, and meanwhile, the interlayer adhesive force is obviously insufficient in the re-coating tests of the comparative examples 1-2.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. The recoatable flexible fluorocarbon coating is characterized by being an A and B two-component system, wherein 100 parts by mass of the coating comprise:
the component A comprises: 47.2-58.3 parts of fluorocarbon resin
11.1-15.3 parts of pigment and filler
1-1.4 parts of modified wollastonite
0.26 to 0.36 portion of base material wetting agent
11.4-15.7 parts of component A solvent
2.0-3.0 parts of other auxiliary agents;
and B component: 1.5-2 parts of polyisocyanate trimer
10.3 to 12.1 parts of elastic curing agent
2-3 parts of a component B solvent;
the fluorocarbon resin is low-Tg FEVE fluorocarbon resin with a chlorotrifluoroethylene and vinyl ether alternating copolymerization structure, the Tg value is less than or equal to 20 ℃, the solid content of the fluorocarbon resin accounts for 50 percent of the fluorocarbon resin, the solid content of the fluorocarbon resin accounts for more than or equal to 43 percent of the mass of a dry film, and other additives comprise one or more of thixotropic agents, defoaming agents, dispersing agents and light stabilizers; the mass ratio of the elastic curing agent to the fluorocarbon resin cured by the polyisocyanate trimer is 1.8-3.4: 1; the isocyanate index in the two-component system is 1.07-1.11.
2. A fluorocarbon coating according to claim 1, characterized in that 100 parts by mass thereof comprises:
the component A comprises: 51.5-56.2 parts of fluorocarbon resin
12.5 to 14.7 portions of pigment and filler
1.1-1.3 parts of modified wollastonite
0.28 to 0.34 portion of base material wetting agent
12.5-15.1 parts of component A solvent
2.3-2.7 parts of other auxiliary agents;
and B component: 1.6-1.8 parts of polyisocyanate trimer
10.3 to 11.2 parts of elastic curing agent
And 2.4-2.9 parts of a component B solvent.
3. A fluorocarbon coating according to claim 1, characterized in that the polyisocyanate trimer is hexamethylene diisocyanate trimer having a solids content of 90% or more.
4. A fluorocarbon coating according to claim 1, characterized in that the elastomeric curing agent is asahi chemical E402-90T or asahi chemical E405-80T.
5. A fluorocarbon coating according to claim 1, characterized in that the substrate wetting agent is a polyether siloxane copolymer.
6. A fluorocarbon coating as claimed in claim 1, characterized in that the modified wollastonite is acicular wollastonite powder modified by 3-mercaptopropyltrimethoxysilane.
7. A fluorocarbon coating according to claim 6, characterized in that the acicular wollastonite powder has a particle size of 1250 mesh.
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| CN1207357C (en) * | 2003-04-18 | 2005-06-22 | 中国科学院金属研究所 | Nano-fluoro carbon aircraft paint and its preparation method |
| JP2007023175A (en) * | 2005-07-19 | 2007-02-01 | Nippon Kayaku Co Ltd | Low-refractive index resin composition and cured product thereof |
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| CN1580154A (en) * | 2004-05-18 | 2005-02-16 | 大连振邦氟涂料股份有限公司 | A kind of fluorocarbon coating and preparation method thereof |
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