CN116144248B - High-temperature-resistant powder coating capable of being recoated and preparation process thereof - Google Patents
High-temperature-resistant powder coating capable of being recoated and preparation process thereof Download PDFInfo
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- CN116144248B CN116144248B CN202310035460.7A CN202310035460A CN116144248B CN 116144248 B CN116144248 B CN 116144248B CN 202310035460 A CN202310035460 A CN 202310035460A CN 116144248 B CN116144248 B CN 116144248B
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- powder coating
- organic silicon
- silicon resin
- resistant powder
- recoatable
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- 238000000576 coating method Methods 0.000 title claims abstract description 45
- 239000011248 coating agent Substances 0.000 title claims abstract description 44
- 239000000843 powder Substances 0.000 title claims abstract description 33
- 238000002360 preparation method Methods 0.000 title abstract description 9
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 36
- 229920005989 resin Polymers 0.000 claims abstract description 36
- 239000011347 resin Substances 0.000 claims abstract description 36
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 36
- 239000010703 silicon Substances 0.000 claims abstract description 36
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 claims abstract description 24
- 125000003944 tolyl group Chemical group 0.000 claims abstract description 17
- 239000003822 epoxy resin Substances 0.000 claims abstract description 14
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 14
- QGBSISYHAICWAH-UHFFFAOYSA-N dicyandiamide Chemical compound NC(N)=NC#N QGBSISYHAICWAH-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 11
- 239000000049 pigment Substances 0.000 claims abstract description 11
- 239000000945 filler Substances 0.000 claims abstract description 10
- 239000003795 chemical substances by application Substances 0.000 claims description 13
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 claims description 11
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 9
- 229920000570 polyether Polymers 0.000 claims description 9
- 239000011521 glass Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- JCVQKRGIASEUKR-UHFFFAOYSA-N triethoxy(phenyl)silane Chemical compound CCO[Si](OCC)(OCC)C1=CC=CC=C1 JCVQKRGIASEUKR-UHFFFAOYSA-N 0.000 claims description 8
- GXDVEXJTVGRLNW-UHFFFAOYSA-N [Cr].[Cu] Chemical compound [Cr].[Cu] GXDVEXJTVGRLNW-UHFFFAOYSA-N 0.000 claims description 7
- 229910052788 barium Inorganic materials 0.000 claims description 7
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims description 7
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 7
- 239000004576 sand Substances 0.000 claims description 7
- JNYUEHVKLOZOHU-UHFFFAOYSA-N diethoxy-[(2-methylpropan-2-yl)oxy]silane Chemical compound CC(C)(O[SiH](OCC)OCC)C JNYUEHVKLOZOHU-UHFFFAOYSA-N 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 6
- 239000000178 monomer Substances 0.000 claims description 6
- 239000002904 solvent Substances 0.000 claims description 6
- CPUDPFPXCZDNGI-UHFFFAOYSA-N triethoxy(methyl)silane Chemical compound CCO[Si](C)(OCC)OCC CPUDPFPXCZDNGI-UHFFFAOYSA-N 0.000 claims description 6
- 239000003054 catalyst Substances 0.000 claims description 5
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- LLHKCFNBLRBOGN-UHFFFAOYSA-N propylene glycol methyl ether acetate Chemical compound COCC(C)OC(C)=O LLHKCFNBLRBOGN-UHFFFAOYSA-N 0.000 claims description 5
- -1 siloxanes Chemical class 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 4
- ISAOCJYIOMOJEB-UHFFFAOYSA-N benzoin Chemical compound C=1C=CC=CC=1C(O)C(=O)C1=CC=CC=C1 ISAOCJYIOMOJEB-UHFFFAOYSA-N 0.000 claims description 4
- 238000001125 extrusion Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 244000028419 Styrax benzoin Species 0.000 claims description 2
- 235000000126 Styrax benzoin Nutrition 0.000 claims description 2
- 235000008411 Sumatra benzointree Nutrition 0.000 claims description 2
- 229960002130 benzoin Drugs 0.000 claims description 2
- 235000019382 gum benzoic Nutrition 0.000 claims description 2
- 239000002671 adjuvant Substances 0.000 claims 2
- 239000003623 enhancer Substances 0.000 claims 1
- DQYBDCGIPTYXML-UHFFFAOYSA-N ethoxyethane;hydrate Chemical compound O.CCOCC DQYBDCGIPTYXML-UHFFFAOYSA-N 0.000 claims 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 claims 1
- 230000008018 melting Effects 0.000 claims 1
- 238000012643 polycondensation polymerization Methods 0.000 claims 1
- 239000006087 Silane Coupling Agent Substances 0.000 abstract description 15
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 239000010410 layer Substances 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000004593 Epoxy Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- JLUFWMXJHAVVNN-UHFFFAOYSA-N methyltrichlorosilane Chemical compound C[Si](Cl)(Cl)Cl JLUFWMXJHAVVNN-UHFFFAOYSA-N 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 2
- 238000006068 polycondensation reaction Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- ORVMIVQULIKXCP-UHFFFAOYSA-N trichloro(phenyl)silane Chemical compound Cl[Si](Cl)(Cl)C1=CC=CC=C1 ORVMIVQULIKXCP-UHFFFAOYSA-N 0.000 description 2
- 239000005052 trichlorosilane Substances 0.000 description 2
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005282 brightening Methods 0.000 description 1
- KTUQUZJOVNIKNZ-UHFFFAOYSA-N butan-1-ol;hydrate Chemical compound O.CCCCO KTUQUZJOVNIKNZ-UHFFFAOYSA-N 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 230000021164 cell adhesion Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000007822 coupling agent Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- CWAFVXWRGIEBPL-UHFFFAOYSA-N ethoxysilane Chemical compound CCO[SiH3] CWAFVXWRGIEBPL-UHFFFAOYSA-N 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- CHJMFFKHPHCQIJ-UHFFFAOYSA-L zinc;octanoate Chemical compound [Zn+2].CCCCCCCC([O-])=O.CCCCCCCC([O-])=O CHJMFFKHPHCQIJ-UHFFFAOYSA-L 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
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
-
- 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
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
-
- 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
- C09D5/03—Powdery paints
- C09D5/033—Powdery paints characterised by the additives
-
- 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
- C09D5/18—Fireproof paints including high temperature resistant paints
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Paints Or Removers (AREA)
- Epoxy Resins (AREA)
Abstract
The invention discloses a recoatable high-temperature-resistant powder coating which comprises the following components in parts by mass: 10-20% of methyl phenyl siloxane type organic silicon resin, 16-32% of bisphenol A type epoxy resin, 4-8% of dicyandiamide, 40-60% of pigment filler, 1-2% of silane coupling agent and 0.5-2% of auxiliary agent. The invention also discloses a preparation process of the recoating high-temperature-resistant powder coating. The invention selects the methyl phenyl siloxane type organic silicon resin, weakens the rigidity of the organic silicon resin, increases the thermoplasticity of the organic silicon resin, improves the surface energy of the organic silicon resin as much as possible and increases the binding force during recoating under the premise of ensuring the temperature resistance.
Description
Technical Field
The invention relates to a powder coating and a preparation process thereof, in particular to a recoatable high-temperature-resistant powder coating and a preparation process thereof.
Background
The powder coating is an environment-friendly coating widely applied to the surface coating of base materials or equipment in various industries at present, and has been rapidly developed in recent years with the advantages of economy, high efficiency, environmental protection, energy conservation and the like. The powder coating contains no solvent, is 100% solid powder coating, has the characteristics of no solvent, no pollution, energy and resource saving, labor intensity reduction, high mechanical strength of coating film and the like, and can be widely applied to the fields of building, automobiles, machinery, chemical industry, energy sources, electronic and electrical equipment and the like.
In the coating of powder coating, because of the requirement of the coating process, if the poor surface state of the coating occurs, a layer of coating is required to be sprayed for modification, and the binding force between the two layers is required to be good enough, at least the grade of 2mm multiplied by 2mm and less than or equal to 1 can be tested through the hundred-grid adhesive force, so that the use requirement can be met. However, conventional powder coating resistant to the high temperature of more than 400 ℃ cannot be recoated, and once poor spraying occurs, the whole workpiece can only be stripped or scrapped, so that the coating cost is greatly increased. The high-temperature resistant powder coating is characterized in that the existing high-temperature resistant powder coating above 400 ℃ consists of organic silicon resin, epoxy resin, an epoxy curing agent, a filler, low-melting-point glass powder, pigment and an auxiliary agent, wherein the organic silicon resin has lower surface energy, so that the surface energy of a coating formed by the high-temperature resistant powder coating is lower than that of a common coating.
Disclosure of Invention
It is an object of the present invention to provide a high temperature resistant powder coating that is recoatable.
The second purpose of the invention is to provide a preparation process of the recoating high-temperature-resistant powder coating.
One of the purposes of the invention is realized by the following technical scheme: the recoatable high temperature resistant powder coating comprises the following components in percentage by mass:
10 to 20 percent of methyl phenyl siloxane type organic silicon resin
Bisphenol A type epoxy resin 16-32%
Dicyandiamide 4-8%
Pigment and filler 40-60%
Silane coupling agent 1-2%
0.5-2% of auxiliary agent.
Preferably, the method comprises the steps of,
15% of methyl phenyl siloxane type organic silicon resin
Bisphenol A type epoxy resin 20%
Dicyandiamide 5%
Pigment and filler 57%
Silane coupling agent 2%
1% of auxiliary agent.
The methyl phenyl siloxane type organic silicon resin is synthesized by taking ethoxysilane as a monomer and adopting high-temperature dealcoholization polycondensation. In one embodiment, phenyl triethoxysilane, methyl triethoxysilane and dimethyl triethoxysilane are selected to form a mixed monomer, and the methyl phenyl siloxane type organic silicon resin is obtained through dealcoholization and polycondensation in the presence of n-butanol, a solvent and a catalyst.
The proportion of the phenyltriethoxysilane, the methyltriethoxysilane and the dimethyltriethoxysilane affects the temperature resistance, and an increase in the amount of the phenyltriethoxysilane can improve the temperature resistance, but too much of the phenyltriethoxysilane can result in strong rigidity and reduced recoating capability. Thus, in a preferred embodiment of the present invention, the mass ratio between the phenyltriethoxysilane, methyltriethoxysilane and dimethyltriethoxysilane is 20:15:3.
The solvent includes water, propylene glycol methyl ether acetate (PMA), etc.
The silane coupling agent is nonionic polyether siloxane. The nonionic structure enables the coupling agent to be suitable for various surfaces of cations, anions and nonionic, and can be well combined with other various components in the coating. The polyether siloxane has stronger temperature resistance, is more suitable for being used in high-temperature resistant products, can adapt to the temperature required by curing particularly in the curing process, ensures the increase of the interlayer adhesive force, and has great help to both the coating and the substrate and the coating. The polyether siloxane has excellent wettability, can be uniformly attached to the surface of a target inorganic substance by high-speed dispersion in a short time, and has better effect in the subsequent combination with various components of a formula than the traditional silane coupling agent.
Nonionic polyether siloxanes such as5847。
The pigment and filler comprises one or more than two of low-melting-point glass powder, precipitated barium, iron-manganese black, copper-chromium black, iron oxide red and the like.
The auxiliary agent is an auxiliary agent for a conventional powder coating and comprises one or two of benzoin, a leveling agent, a brightening agent, a sand grain agent and a ventilation agent.
The second object of the invention is realized by the following technical scheme: the preparation process of the high temperature resistant powder coating capable of being recoated comprises the steps of weighing methyl phenyl siloxane type organic silicon resin, bisphenol A type epoxy resin, dicyandiamide, pigment and filler, silane coupling agent and auxiliary agent according to the proportion, fully mixing and crushing; feeding the crushed materials into an extruder for melt extrusion; the extruded material is pressed into tablets, cooled, crushed, sieved and packaged.
Compared with the prior art, the method has the following beneficial effects:
1. in order to achieve higher high temperature resistance, generally, the organic silicon resin is generally introduced with phenyl groups as much as possible, phenyl groups are rigid mechanisms, so that the final organic silicon resin has strong rigidity and poor flexibility, and a coating film formed by the organic silicon resin has lower surface energy and poorer bonding force with a second layer of coating material when being melted under the same wettability.
The invention selects the methyl phenyl siloxane type organic silicon resin, weakens the rigidity of the organic silicon resin, increases the thermoplasticity of the organic silicon resin, improves the surface energy of the organic silicon resin as much as possible and increases the binding force during recoating under the premise of ensuring the temperature resistance. Compared with the existing product, the recoating adhesive force of the invention has very obvious effect. The traditional organic silicon resin has a plurality of ring bodies, has extremely high rigidity and cannot be recoated.
2. The invention also adds a silane coupling agent, in particular to nonionic polyether siloxane, which increases the residual hydroxyl content of the whole surface of the coating on one hand and can be tightly combined with the solidified first layer when the second layer of coating is melted during recoating by adjusting the combination capacity between organic and inorganic matter interfaces on the other hand.
Detailed Description
Example 1
| Raw material name | Quantity of |
| Methyl phenyl siloxane type organic silicon resin | 15％ |
| Bisphenol A type epoxy resin | 20％ |
| Dicyandiamide | 5％ |
| Low-melting glass powder | 8％ |
| Copper chromium black | 7％ |
| Manganese iron black | 7％ |
| Precipitated barium | 35％ |
| Sand grain agent | 1％ |
| Silane coupling agent | 2％ |
| And (5) summation: | 100％ |
the silane coupling agent is5847。
The preparation process comprises the following steps:
(1) Preparation of methyl phenyl siloxane type organic silicon resin
200g of phenyltriethoxysilane, 150g of methyltriethoxysilane, 30g of dimethyltriethoxysilane, 30g of propylene glycol methyl ether acetate (PMA) and 0.1g of acetic acid are put into an overhead tank and stirred uniformly to obtain a mixed monomer. 50g of n-butanol and 100g of water are pumped into the reaction kettle.
At 15-25 deg.c, mixed monomer is dropped into the reaction kettle while stirring for 2 hr, and the reaction is maintained for 5 hr. Then heating to 70 ℃, starting dealcoholization reaction, adding 0.02g of triethanolamine catalyst when heating to 90 ℃, and continuing to react to 140-145 ℃ for 2 hours to obtain the catalyst.
(2) Weighing methyl phenyl siloxane type organic silicon resin, bisphenol A type epoxy resin, dicyandiamide, pigment and filler, silane coupling agent and auxiliary agent according to the proportion, fully mixing and crushing; feeding the crushed materials into an extruder for melt extrusion; the extruded material is pressed into tablets, cooled, crushed, sieved and packaged.
Example 2
Unlike example 1, the following is: the organic silicon resin has higher duty ratio, more excellent appearance after temperature resistance and no obvious influence on the recoating performance.
| Raw material name | Quantity of |
| Methyl phenyl siloxane type organic silicon resin | 20％ |
| Bisphenol A type epoxy resin | 20％ |
| Dicyandiamide | 5％ |
| Low-melting glass powder | 8％ |
| Copper chromium black | 7％ |
| Manganese iron black | 7％ |
| Precipitated barium | 30％ |
| Sand grain agent | 1％ |
| Silane coupling agent | 2％ |
| And (5) summation: | 100％ |
example 3
Unlike example 1, the following is: the organic silicon resin has unchanged proportion, the proportion of an epoxy curing system is increased, the gloss of the obtained coating is higher than that of example 1, the temperature resistance performance is not different at 400 ℃, but the coating is easy to foam when being burnt by open fire, is not suitable for a scene directly contacting the open fire, and has no change in the recoating adhesive force effect.
Example 4
Unlike example 1, the following is: the polyether silane coupling agent is eliminated, the recoating adhesion test is that the grade is reduced, and the recoating adhesion of 2mm multiplied by 2mm hundred lattice passes grade 1.
| Raw material name | Quantity of |
| Methyl phenyl siloxane type organic silicon resin | 15％ |
| Bisphenol A type epoxy resin | 20％ |
| Dicyandiamide | 5％ |
| Low-melting glass powder | 8％ |
| Copper chromium black | 7％ |
| Manganese iron black | 7％ |
| Precipitated barium | 37％ |
| Sand grain agent | 1％ |
| Silane coupling agent | 0 |
| And (5) summation: | 100％ |
comparative example 1
Unlike example 1, the following is: the silicone resin was prepared by conventional techniques, see comparative example 2. The recoating adhesion was poor, the recoating 2mm x 2mm hundred cell adhesion was rated 4 and judged as not recoated.
| Raw material name | Quantity of |
| Organic silicon resin (traditional technology) | 15％ |
| Bisphenol A type epoxy resin | 20％ |
| Dicyandiamide | 5％ |
| Low-melting glass powder | 8％ |
| Copper chromium black | 7％ |
| Manganese iron black | 7％ |
| Precipitated barium | 37％ |
| Sand grain agent | 1％ |
| And (5) summation: | 100％ |
comparative example 2
Unlike example 1, the following is: the organic silicon resin is prepared by the traditional process, and is added with a common silane coupling agent KH560 to recoat the level of 3-4 of 2mm multiplied by 2mm hundred lattice adhesive force, and the organic silicon resin is judged as being incapable of recoating.
Synthesis of the organic silicon resin: 250g of mono phenyl trichlorosilane, 120g of mono methyl trichlorosilane, 50g of dimethyl trichlorosilane, 200g of dimethylbenzene, 30g of n-butyl alcohol, 150g of dimethylbenzene and 800g of water are taken. And when the temperature is less than 25 ℃, adding the monophenyl trichlorosilane, the monomethyl trichlorosilane and the dimethyl trichlorosilane into a high-level tank, stirring uniformly to obtain a mixed monomer, gradually adding water and n-butanol, and maintaining for 30min after the addition is completed for 3.5-4 h. Then washing for 5 times until the pH value is neutral, filtering and concentrating, adding 0.2g of catalyst zinc octoate, heating to 150 ℃, vacuumizing for 3 hours, and cooling and discharging.
| Raw material name | Quantity of |
| Organic silicon resin (traditional technology) | 15％ |
| Bisphenol A type epoxy resin | 20％ |
| Dicyandiamide | 5％ |
| Low-melting glass powder | 8％ |
| Copper chromium black | 7％ |
| Manganese iron black | 7％ |
| Precipitated barium | 35％ |
| Sand grain agent | 1％ |
| Silane coupling agent KH560 | 2％ |
| And (5) summation: | 100％ |
the present invention will be described in further detail with reference to the following examples, but the embodiments of the present invention are not limited thereto, and other various modifications, substitutions, or alterations can be made according to the above-described aspects of the present invention, and according to the ordinary skill and familiar means of the art, without departing from the basic technical spirit of the present invention.
Claims (6)
1. The recoating high-temperature-resistant powder coating is characterized by comprising the following components in percentage by mass:
10 to 20 percent of methyl phenyl siloxane type organic silicon resin
Bisphenol A type epoxy resin 16-32%
Dicyandiamide 4-8%
Pigment and filler 40-60%
Nonionic polyether siloxanes 1-2%
0.5-2% of auxiliary agent;
the methyl phenyl siloxane type organic silicon resin is prepared by dealcoholization and condensation polymerization of phenyl triethoxysilane, methyl triethoxysilane and dimethyl triethoxysilane which form a mixed monomer in the presence of n-butanol, a solvent and a catalyst; the mass ratio of the phenyl triethoxysilane to the methyl triethoxysilane to the dimethyl triethoxysilane is 20:15:3.
2. The recoatable high temperature resistant powder coating according to claim 1, comprising the following components in mass fraction:
15% of methyl phenyl siloxane type organic silicon resin
Bisphenol A type epoxy resin 20%
Dicyandiamide 5%
Pigment and filler 57%
Nonionic polyether siloxanes 2%
1% of auxiliary agent.
3. The recoatable high temperature resistant powder coating of claim 1, wherein the solvent comprises water and propylene glycol methyl ether acetate.
4. The recoatable high temperature resistant powder coating of claim 1, wherein the pigment comprises one or a combination of more than two of a low melting glass frit, precipitated barium, iron manganese black, copper chromium black, iron oxide black, and iron oxide red.
5. The recoatable high temperature resistant powder coating of claim 1, wherein the adjuvant is a conventional powder coating adjuvant including, but not limited to, one or a combination of two of benzoin, leveling agent, gloss enhancer, sand grain agent and air permeable agent.
6. The process for preparing the recoatable high temperature resistant powder coating according to any one of claims 1 to 5, wherein the process comprises weighing methyl phenyl siloxane type organic silicon resin, bisphenol a type epoxy resin, dicyandiamide, pigment and filler, nonionic polyether siloxane and auxiliary agent according to a proportion, fully mixing and crushing; feeding the crushed materials into an extruder for melt extrusion; the extruded material is pressed into tablets, cooled, crushed, sieved and packaged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310035460.7A CN116144248B (en) | 2023-01-10 | 2023-01-10 | High-temperature-resistant powder coating capable of being recoated and preparation process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN113683941A (en) * | 2021-09-18 | 2021-11-23 | 航佳彩新材料(广东)有限公司 | Open fire-resistant high-temperature powder coating special for fireplace and preparation method thereof |
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| CN113683941A (en) * | 2021-09-18 | 2021-11-23 | 航佳彩新材料(广东)有限公司 | Open fire-resistant high-temperature powder coating special for fireplace and preparation method thereof |
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