CN116875171A - Low-friction-coefficient powder coating and preparation method thereof - Google Patents
Low-friction-coefficient powder coating and preparation method thereof Download PDFInfo
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- CN116875171A CN116875171A CN202311062334.7A CN202311062334A CN116875171A CN 116875171 A CN116875171 A CN 116875171A CN 202311062334 A CN202311062334 A CN 202311062334A CN 116875171 A CN116875171 A CN 116875171A
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- 239000000843 powder Substances 0.000 title claims abstract description 105
- 238000000576 coating method Methods 0.000 title claims abstract description 88
- 239000011248 coating agent Substances 0.000 title claims abstract description 76
- 238000002360 preparation method Methods 0.000 title claims abstract description 41
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 67
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000004645 polyester resin Substances 0.000 claims abstract description 45
- 229920001225 polyester resin Polymers 0.000 claims abstract description 45
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 36
- -1 polytetrafluoroethylene Polymers 0.000 claims abstract description 36
- ISAOCJYIOMOJEB-UHFFFAOYSA-N benzoin Chemical compound C=1C=CC=CC=1C(O)C(=O)C1=CC=CC=C1 ISAOCJYIOMOJEB-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000000835 fiber Substances 0.000 claims abstract description 33
- 239000010439 graphite Substances 0.000 claims abstract description 33
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 33
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 33
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 33
- 239000011521 glass Substances 0.000 claims abstract description 30
- 239000011324 bead Substances 0.000 claims abstract description 28
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 25
- 239000005543 nano-size silicon particle Substances 0.000 claims abstract description 22
- 229920001228 polyisocyanate Polymers 0.000 claims abstract description 22
- 239000005056 polyisocyanate Substances 0.000 claims abstract description 22
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 22
- 239000000049 pigment Substances 0.000 claims abstract description 21
- OUPZKGBUJRBPGC-UHFFFAOYSA-N 1,3,5-tris(oxiran-2-ylmethyl)-1,3,5-triazinane-2,4,6-trione Chemical compound O=C1N(CC2OC2)C(=O)N(CC2OC2)C(=O)N1CC1CO1 OUPZKGBUJRBPGC-UHFFFAOYSA-N 0.000 claims abstract description 20
- 230000008569 process Effects 0.000 claims abstract description 20
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 17
- 244000028419 Styrax benzoin Species 0.000 claims abstract description 17
- 235000000126 Styrax benzoin Nutrition 0.000 claims abstract description 17
- 235000008411 Sumatra benzointree Nutrition 0.000 claims abstract description 17
- 229960002130 benzoin Drugs 0.000 claims abstract description 17
- 238000005282 brightening Methods 0.000 claims abstract description 17
- 235000019382 gum benzoic Nutrition 0.000 claims abstract description 17
- 239000003831 antifriction material Substances 0.000 claims abstract description 15
- 239000000203 mixture Substances 0.000 claims description 34
- 239000003638 chemical reducing agent Substances 0.000 claims description 19
- 239000002994 raw material Substances 0.000 claims description 19
- 238000001125 extrusion Methods 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 7
- 239000002131 composite material Substances 0.000 claims description 7
- 229920006122 polyamide resin Polymers 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 5
- 229930182556 Polyacetal Natural products 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 5
- 229920006324 polyoxymethylene Polymers 0.000 claims description 5
- 239000004593 Epoxy Substances 0.000 claims description 3
- 239000004698 Polyethylene Substances 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 125000006297 carbonyl amino group Chemical group [H]N([*:2])C([*:1])=O 0.000 claims description 3
- 239000000945 filler Substances 0.000 claims description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 3
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 claims description 3
- 239000000391 magnesium silicate Substances 0.000 claims description 3
- 229910052919 magnesium silicate Inorganic materials 0.000 claims description 3
- 235000019792 magnesium silicate Nutrition 0.000 claims description 3
- 238000006068 polycondensation reaction Methods 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- 238000007873 sieving Methods 0.000 claims description 3
- 239000000454 talc Substances 0.000 claims description 2
- 235000012222 talc Nutrition 0.000 claims description 2
- 229910052623 talc Inorganic materials 0.000 claims description 2
- 238000005457 optimization Methods 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 34
- 238000005299 abrasion Methods 0.000 description 8
- 238000009472 formulation Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
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- 230000002195 synergetic effect Effects 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
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- 150000001875 compounds Chemical class 0.000 description 2
- 238000007405 data analysis Methods 0.000 description 2
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- 239000004615 ingredient Substances 0.000 description 2
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- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000001132 ultrasonic dispersion Methods 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
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- 229920001971 elastomer Polymers 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
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- 239000003973 paint Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 239000002966 varnish 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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/06—Polyurethanes from polyesters
-
- 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
-
- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
-
- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Paints Or Removers (AREA)
Abstract
The invention relates to the technical field of powder coating preparation, and provides a low-friction-coefficient powder coating and a preparation method thereof, wherein the powder coating comprises the following components in parts by weight: 40 to 50 parts of carboxyl-terminated polyester resin A,3 to 3.7 parts of triglycidyl isocyanurate, 10 to 16 parts of hydroxyl-terminated polyester resin B,2.5 to 4 parts of closed polyisocyanate, 0.7 to 1 part of flatting agent, 0.7 to 1 part of brightening agent, 0.3 to 0.5 part of benzoin, 5 to 10 parts of glass beads, 10 to 20 parts of talcum powder, 0.5 to 1 part of graphite fiber, 0.5 to 1.5 parts of antifriction agent, 0.5 to 1 part of polytetrafluoroethylene, 2 to 3 parts of wax powder, 0.1 to 0.3 part of silane coupling agent, 0.05 to 0.2 part of nano silicon dioxide, 0.2 to 0.5 part of wear-resisting agent and 2 to 20 parts of pigment. The invention prepares the low friction coefficient powder coating through the optimization of different formulas and processes.
Description
Technical Field
The invention belongs to the technical field of powder coating preparation, and particularly relates to a low-friction-coefficient powder coating and a preparation method thereof.
Background
The powder coating is a novel 100% solid powder coating without solvent, and has the characteristics of no solvent, no pollution, recoverability, environmental protection, energy and resource conservation, high mechanical strength of coating film and the like.
The industries of curtain hanging rings, guide rails, large-scale precision machine tools, fan impellers, shaft sleeves, piston rods and the like pay more attention to economic losses caused by self-abrasion of equipment, and meanwhile, the requirements on antifriction performance of powder coatings are higher. Powder coatings are widely used in spray finishing in these industries to form a coating film having protective, decorative and special functions on the surface of equipment. The conventional manufacturer generally only considers powder coating decoration, and does not consider the problems of abrasion and the like during the running of equipment in the industries. Therefore, low coefficient of friction powder coatings were designed to address the current industry problems.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a low friction coefficient powder coating to solve the problem that the powder coating in the prior art cannot reduce abrasion in industries such as curtain hanging rings, guide rails, large-scale precision machine tools, fan impellers, shaft sleeves, piston rods and the like.
The technical scheme provided by the invention is as follows: the low friction coefficient powder coating comprises the following preparation raw materials in parts by weight: 40 to 50 parts of carboxyl-terminated polyester resin A,3 to 3.7 parts of triglycidyl isocyanurate, 10 to 16 parts of hydroxyl-terminated polyester resin B,2.5 to 4 parts of closed polyisocyanate, 0.7 to 1 part of flatting agent, 0.7 to 1 part of brightening agent, 0.3 to 0.5 part of benzoin, 5 to 10 parts of glass beads, 10 to 20 parts of talcum powder, 0.5 to 1 part of graphite fiber, 0.5 to 1.5 parts of antifriction agent, 0.5 to 1 part of polytetrafluoroethylene, 2 to 3 parts of wax powder, 0.1 to 0.3 part of silane coupling agent, 0.05 to 0.2 part of nano silicon dioxide, 0.2 to 0.5 part of wear-resisting agent and 2 to 20 parts of pigment.
As an improvement, the acid value of the carboxyl terminated polyester resin A is 30-36 mgKOH/g, and the viscosity at 200 ℃ is 3500-4500 mPa.s.
As an improvement, the hydroxyl value of the hydroxyl-terminated polyester resin B is 35-45 mgKOH/g, and the viscosity at 200 ℃ is 4000-6000 mPa.s.
As an improved scheme, the epoxy equivalent of the triglycidyl isocyanurate is less than or equal to 108 g/eq under the condition of 90-105 ℃.
As an improvement, the NCO content of the closed polyisocyanate is 14.0-15.0%, and the carbon content of the graphite fiber is more than or equal to 99%.
As an improvement, the friction reducer is prepared by mixing 0.5 to 1 part by weight of polyamide resin and 1 to 2 parts by weight of polyacetal, wherein the polyamide resin is a polycondensation type high molecular compound having a CONH structure in the molecule.
As an improved scheme, the median particle diameter of the talcum powder is 5-25um, and the talcum powder comprises hydrous magnesium silicate;
the wax powder is mixed wax of composite micro powder comprising polyethylene wax and polytetrafluoroethylene wax, the melting range is 130-135 ℃, and the median particle diameter is 10-15 um.
As an improved scheme, the wear-resistant agent is Al 2 O 3 /TiO 2 Composite powder, wherein Al 2 O 3 /TiO 2 Has a mohs hardness of 9.
Another object of the present invention is to provide a method for preparing a low friction coefficient based powder coating, comprising the steps of:
s1, sequentially adding glass beads, graphite fibers, a friction reducer, polytetrafluoroethylene, nano silicon dioxide and an anti-wear agent into a reaction container, stirring materials in a water bath kettle at the temperature of 80-90 ℃, dispersing the materials for 2-3 hours by ultrasonic waves, and then carrying out bonding process treatment to ensure that the graphite fibers, the friction reducer, the polytetrafluoroethylene and the anti-wear agent are uniformly adsorbed on the surfaces of the glass beads to obtain a mixture A;
s2, placing the wax powder, the talcum powder, the pigment and the silane coupling agent into a stirrer for stirring at the speed of 100 PRM-150 PRM until a sticky mixture with uniform color is obtained, and then performing tabletting treatment and high-speed grinding by a coffee mill to repeatedly adhere the wax powder on the surfaces of the filler and the pigment particles to obtain a mixture B;
s3, fully and uniformly mixing carboxyl-terminated polyester resin A, triglycidyl isocyanurate, hydroxyl-terminated polyester resin B, talcum powder, closed polyisocyanate, leveling agent, brightening agent, benzoin, mixture A and mixture B by using a mixer to obtain a mixture C;
and S4, carrying out melt extrusion, tabletting, crushing, fine crushing, sieving and grading on the mixture C to obtain the low-friction-coefficient powder coating.
As a modification, the step of melt extrusion of the mixture C specifically includes:
and (3) directly feeding the mixture C into a double screw for melt extrusion again after melt extrusion of a single screw, wherein the operation frequency of the single screw is 35Hz-40Hz, and the frequency of a double screw extruder is 42Hz-50Hz.
In the embodiment of the invention, the blocked polyisocyanate is used as a curing agent to react with the hydroxyl-terminated polyester resin B to generate polyurethane, and the chemical reaction between functional groups does not occur in the melting and leveling process of the blocked polyisocyanate before deblocking, and the viscosity of the selected carboxyl-terminated polyester resin A is low, so that a smooth and flat coating film is formed in a sufficient time in the melting and leveling process of the low-friction powder coating under the synergistic effect, wax powder is fully transferred to the coating film in a sufficient time, talcum powder, antifriction agent and graphite fiber are sufficiently time to form a layer of lubricating film, and polytetrafluoroethylene and an antiwear agent are sufficiently time to form a low-energy surface. Meanwhile, in the high-temperature curing process, the glass beads and polyurethane are mutually accommodated to provide a coating film with high crosslinking density, so that graphite fibers, a friction reducer, polytetrafluoroethylene and an antiwear agent adsorbed on the glass beads are better dispersed, namely, the raw materials such as carboxyl-terminated polyester resin A, hydroxyl-terminated polyester resin B and the glass beads cooperate with each other, so that the surface of the coating film has lower roughness and the coating film has higher compactness;
the wax powder migrates to the surface of the coating film in the process of melting and leveling the powder coating, reduces the surface tension and the surface friction coefficient of the film layer, and plays a role in slip increasing. In the process of transferring the wax matrix to the surface, the gas adsorbed on the porous substrate or the water vapor of the coating film is also removed, so that the compactness of the coating film is further increased, and the smoothness of the coating film is improved. The invention relates to a treatment process for stirring, tabletting and grinding wax powder, talcum powder and pigment, which aims to solve the problems of hazing, reduced gloss, reduced storage stability and the like of the surface of a coating film when the addition amount of the wax powder is too large;
by utilizing the self-lubricity of talcum powder and antifriction agent and matching with graphite fibers with special hexagonal lamellar structures, a layer of lubricating film is very easy to form on the surface of a powder coating film, so that the friction retardation of the coating film can be effectively reduced;
the polytetrafluoroethylene and the wear-resistant agent act together to form a low-energy surface of the coating film, so that surface molecules can slide mutually, the friction coefficient is extremely low, and the wear resistance of the coating film can be enhanced.
Detailed Description
Embodiments of the technical scheme of the present invention will be described in detail below. The following examples are only for the purpose of more clearly illustrating the technical aspects of the present invention, and thus are merely exemplary and are not to be construed as limiting the scope of the present invention.
Example 1
The low friction coefficient powder coating comprises the following preparation raw materials in parts by weight: 45 parts of carboxyl-terminated polyester resin A,3.4 parts of triglycidyl isocyanurate, 12 parts of hydroxyl-terminated polyester resin B,3 parts of blocked polyisocyanate, 0.9 part of flatting agent, 0.9 part of brightening agent, 0.5 part of benzoin, 10 parts of glass beads, 10 parts of talcum powder, 1 part of graphite fiber, 1 part of antifriction agent, 0.8 part of polytetrafluoroethylene, 2 parts of wax powder, 0.2 part of silane coupling agent, 0.1 part of nano silicon dioxide, 0.5 part of wear-resisting agent and 8.7 parts of pigment;
wherein, the specific constraint parameters of the components are as follows:
the acid value of the carboxyl-terminated polyester resin A is 30-36 mgKOH/g, and the viscosity at 200 ℃ is 3500-4500 mPa.s;
the hydroxyl value of the hydroxyl-terminated polyester resin B is 35-45 mgKOH/g, and the viscosity at 200 ℃ is 4000-6000 mPa.s;
triglycidyl isocyanurate has an epoxy equivalent of g/eq less than or equal to 108 at 90-105 ℃;
the NCO content of the closed polyisocyanate is 14.0-15.0%, and the carbon content of the graphite fiber is more than or equal to 99%;
polytetrafluoroethylene is a high molecular polymer prepared by polymerizing tetrafluoroethylene as a monomer, white powder, carbon atoms in formed long chain group molecules are surrounded by surrounding atoms, actual adhesion between molecules is small, a low-energy surface is formed, surface molecules can slide mutually, and an extremely low friction coefficient is presented;
the antifriction agent is prepared by mixing 0.5 to 1 part of polyamide resin and 1 to 2 parts of polyacetal, wherein the polyamide resin is a polycondensation type high molecular compound with a CONH structure in the molecule; polyacetal is a thermoplastic high-density high-crystallinity high-molecular polymer with good self-lubricity;
the glass microsphere is an inorganic nonmetallic spherical material with a micron-sized hollow structure, can be compatible with thermosetting resins such as polyurethane, epoxy resin and the like, and has the density of 0.25-0.28g/cm 3 ；
Talcum powder is white powder with the median particle diameter of 5-25um, contains water-containing magnesium silicate as the main component, and has the characteristics of good lubricity, high temperature resistance, corrosion resistance and the like;
the wax powder is mixed wax of composite micro powder comprising polyethylene wax and polytetrafluoroethylene wax, the melting range is 130-135 ℃, and the median particle diameter is 10-15 um;
the graphite fiber has a hexagonal crystal structure, and is easy to shear due to the special hexagonal lamellar structure, so that a layer of lubricating film is very easy to form on a friction surface in the friction process, and a good self-lubricating effect is achieved;
wear-resistant agent, al 2 O 3 /TiO 2 The composite powder has better antifriction and antiwear properties, wherein Al 2 O 3 /TiO 2 Is a high strength wear resistant material with a mohs hardness of 9.
The median particle diameter of the nano silicon dioxide is 30+/-5 nn, and the nano silicon dioxide is white powder, has good dispersibility and can greatly improve the scrub resistance, strength and hardness of the coating.
Based on the above description, the preparation method of the low friction coefficient powder coating specifically comprises the following steps:
s1, sequentially adding glass beads, graphite fibers, a friction reducer, polytetrafluoroethylene, nano silicon dioxide and an anti-wear agent into a reaction container, stirring materials in a water bath kettle at the temperature of 80-90 ℃, dispersing the materials for 2-3 hours by ultrasonic waves, and then carrying out bonding process treatment to ensure that the graphite fibers, the friction reducer, the polytetrafluoroethylene and the anti-wear agent are uniformly adsorbed on the surfaces of the glass beads to obtain a mixture A;
s2, placing the wax powder, the talcum powder, the pigment and the silane coupling agent into a stirrer for stirring at the speed of 100 PRM-150 PRM until a sticky mixture with uniform color is obtained, and then performing tabletting treatment and high-speed grinding by a coffee mill to repeatedly adhere the wax powder on the surfaces of the filler and the pigment particles to obtain a mixture B;
s3, fully and uniformly mixing carboxyl-terminated polyester resin A, triglycidyl isocyanurate, hydroxyl-terminated polyester resin B, talcum powder, closed polyisocyanate, leveling agent, brightening agent, benzoin, mixture A and mixture B by using a mixer to obtain a mixture C;
and S4, carrying out melt extrusion, tabletting, crushing, fine crushing, sieving and grading on the mixture C to obtain the low-friction-coefficient powder coating.
In this example, the preparation method prepares a low friction coefficient powder coating with excellent performance through the optimization of different formulas and processes.
Wherein: the preparation method of the antifriction agent comprises the following steps:
according to parts by weight, 0.5 to 1 part of polyamide resin and 1 to 2 parts of polyacetal are put into a plastic mixing device to be mixed for 10 to 30 minutes under the condition of 200 to 300RPM, and then the mixture is subjected to melt extrusion and tabletting by a single screw extruder to obtain soft mixture flakes, and then the soft mixture flakes are crushed by a swing type crusher to obtain the friction reducer with strong friction force reducing capability;
the Al mentioned above 2 O 3 /TiO 2 The preparation method of the composite powder comprises the following steps: the aluminum-containing gel and the titanium-containing gel are synthesized under hydrothermal conditions.
In this embodiment, the graphite fiber, the friction reducer, the polytetrafluoroethylene and the wear-resistant agent are uniformly dispersed and adsorbed on the glass beads, and the glass beads and the polyurethane are mutually accommodated when cured at a high temperature, so that the components of the graphite fiber, the friction reducer, the polytetrafluoroethylene and the wear-resistant agent can be uniformly dispersed in the coating film.
In this embodiment, the dispersing agent is nano silicon dioxide, and the specific process is as follows:
adding graphite fiber, friction reducer, polytetrafluoroethylene, wear-resisting agent and glass microsphere nano silicon dioxide into a reaction vessel, stirring the materials in a water bath kettle at the temperature of 80-90 ℃ and dispersing the materials for 2-3 hours by ultrasonic waves, primarily dispersing the materials, and then carrying out heat mixing process treatment. The heat mixing process is to add the preliminarily dispersed materials into a reaction kettle of a mixer, and bond the mixer for 600s-800s under the conditions that the temperature is 90-95 ℃ and the rotating speed is 1200-1300 PRM.
In this embodiment, the step of melt extrusion of the mixture C comprises in particular:
directly feeding the mixture C into a double screw for melt extrusion again after melt extrusion of a single screw, wherein the running frequency of the single screw is 35Hz-40Hz, and the frequency of a double screw extruder is 42Hz-50Hz;
the components are uniformly dispersed through twice melt extrusion of the single screw and the double screws, so that the stability, lower friction coefficient, smoother, finer and higher-hardness surface of the prepared powder coating is further improved, and the durability of the coating is further improved.
Example 2
The low friction coefficient powder coating comprises the following preparation raw materials in parts by weight: 45 parts of carboxyl-terminated polyester resin A,3.4 parts of triglycidyl isocyanurate, 16 parts of hydroxyl-terminated polyester resin B,4 parts of blocked polyisocyanate, 0.9 part of flatting agent, 0.9 part of brightening agent, 0.5 part of benzoin, 10 parts of glass beads, 10 parts of talcum powder, 1 part of graphite fiber, 1 part of antifriction agent, 0.8 part of polytetrafluoroethylene, 2 parts of wax powder, 0.2 part of silane coupling agent, 0.1 part of nano silicon dioxide, 0.5 part of wear-resisting agent and 3.7 parts of pigment;
the preparation process parameters and preparation methods of this example 2 and example 1 are the same except that the proportions of the above preparation components are different, and are not described here again.
Example 3
The low friction coefficient powder coating comprises the following preparation raw materials in parts by weight: 50 parts of carboxyl-terminated polyester resin A,3.7 parts of triglycidyl isocyanurate, 12 parts of hydroxyl-terminated polyester resin B,3 parts of blocked polyisocyanate, 0.9 part of flatting agent, 0.9 part of brightening agent, 0.5 part of benzoin, 10 parts of glass beads, 10 parts of talcum powder, 1 part of graphite fiber, 1 part of antifriction agent, 0.8 part of polytetrafluoroethylene, 2 parts of wax powder, 0.2 part of silane coupling agent, 0.1 part of nano silicon dioxide, 0.5 part of wear-resisting agent and 3.4 parts of pigment;
the preparation process parameters and preparation methods of this example 3 are the same as those of example 1 except that the proportions of the respective preparation components are different, and are not described here again.
Example 4
The low friction coefficient powder coating comprises the following preparation raw materials in parts by weight: 45 parts of carboxyl-terminated polyester resin A,3.4 parts of triglycidyl isocyanurate, 12 parts of hydroxyl-terminated polyester resin B,3 parts of blocked polyisocyanate, 0.9 part of flatting agent, 0.9 part of brightening agent, 0.5 part of benzoin, 10 parts of glass beads, 20 parts of talcum powder, 1 part of graphite fiber, 1 part of antifriction agent, 0.8 part of polytetrafluoroethylene, 2 parts of wax powder, 0.2 part of silane coupling agent, 0.1 part of nano silicon dioxide, 0.5 part of wear-resisting agent and 3.7 parts of pigment;
the preparation process parameters and preparation methods of this example 4 are the same as those of example 1 except that the proportions of the respective preparation components are different, and are not described here again.
Example 5
The low friction coefficient powder coating comprises the following preparation raw materials in parts by weight: 45 parts of carboxyl-terminated polyester resin A,3.4 parts of triglycidyl isocyanurate, 12 parts of hydroxyl-terminated polyester resin B,3 parts of blocked polyisocyanate, 0.9 part of flatting agent, 0.9 part of brightening agent, 0.5 part of benzoin, 10 parts of glass beads, 10 parts of talcum powder, 0.8 part of graphite fiber, 0.5 part of friction reducer, 0.8 part of polytetrafluoroethylene, 2 parts of wax powder, 0.2 part of silane coupling agent, 0.1 part of nano silicon dioxide, 0.5 part of wear-resisting agent and 9.4 parts of pigment;
the preparation process parameters and preparation methods of this example 5 are the same as those of example 1 except that the proportions of the respective preparation components are different, and are not described here again.
For the specific implementation results of the above five examples in the specification, eight comparative examples are given below:
comparative example 1
Comparative example 1 differs from example 1 in the preparation raw materials and proportions, and is otherwise identical, specifically: the low friction coefficient powder coating comprises the following preparation raw materials in parts by weight: 30 parts of carboxyl-terminated polyester resin A,2.2 parts of triglycidyl isocyanurate, 12 parts of hydroxyl-terminated polyester resin B,3 parts of blocked polyisocyanate, 0.9 part of flatting agent, 0.9 part of brightening agent, 0.5 part of benzoin, 10 parts of glass beads, 20 parts of talcum powder, 1 part of graphite fiber, 1 part of friction reducer, 0.8 part of polytetrafluoroethylene, 2 parts of wax powder, 0.2 part of silane coupling agent, 0.1 part of nano silicon dioxide, 0.5 part of wear-resisting agent and 14.9 parts of pigment.
Comparative example 2
Comparative example 2 differs from example 1 in the preparation raw materials and proportions, and is otherwise identical, specifically: the low friction coefficient powder coating comprises the following preparation raw materials in parts by weight: 45 parts of carboxyl-terminated polyester resin A,3.4 parts of triglycidyl isocyanurate, 12 parts of hydroxyl-terminated polyester resin B,3 parts of blocked polyisocyanate, 0.9 part of flatting agent, 0.9 part of brightening agent, 0.5 part of benzoin, 10 parts of glass beads, 10 parts of talcum powder, 1 part of graphite fiber, 1 part of antifriction agent, 2 parts of wax powder, 0.2 part of silane coupling agent, 0.1 part of nano silicon dioxide, 0.5 part of wear-resisting agent and 9.5 parts of pigment.
Comparative example 3
Comparative example 3 differs from example 1 in the preparation raw materials and proportions, and is otherwise identical, specifically: the low friction coefficient powder coating comprises, by weight, 45 parts of carboxyl-terminated polyester resin A,3.4 parts of triglycidyl isocyanurate, 12 parts of hydroxyl-terminated polyester resin B,3 parts of blocked polyisocyanate, 0.9 part of leveling agent, 0.9 part of brightening agent, 0.5 part of benzoin, 10 parts of talcum powder, 0.8 part of polytetrafluoroethylene, 1 part of graphite fiber, 0.5 part of antifriction agent, 2 parts of wax powder, 0.2 part of silane coupling agent, 0.1 part of nano silicon dioxide, 0.5 part of wear-resisting agent and 18.7 parts of pigment.
Comparative example 4
Comparative example 4 differs from example 1 in the preparation raw materials and proportions, and is otherwise identical, specifically: the low friction coefficient powder coating comprises, by weight, 45 parts of carboxyl-terminated polyester resin A,3.4 parts of triglycidyl isocyanurate, 12 parts of hydroxyl-terminated polyester resin B,3 parts of blocked polyisocyanate, 0.9 part of leveling agent, 0.9 part of brightening agent, 0.5 part of benzoin, 10 parts of talcum powder, 10 parts of glass beads, 0.8 part of polytetrafluoroethylene, 1 part of graphite fiber, 2 parts of wax powder, 0.2 part of silane coupling agent, 0.1 part of nano silicon dioxide, 0.5 part of wear-resisting agent and 9.7 parts of pigment.
Comparative example 5
Comparative example 5 differs from example 1 in the preparation raw materials and proportions, and is otherwise identical, specifically: the low friction coefficient powder coating comprises the following preparation raw materials in parts by weight: 45 parts of carboxyl-terminated polyester resin A,3.4 parts of triglycidyl isocyanurate, 12 parts of hydroxyl-terminated polyester resin B,3 parts of blocked polyisocyanate, 0.9 part of flatting agent, 0.9 part of brightening agent, 0.5 part of benzoin, 10 parts of glass beads, 1 part of graphite fiber, 1 part of friction reducer, 0.8 part of polytetrafluoroethylene, 2 parts of wax powder, 0.2 part of silane coupling agent, 0.1 part of nano silicon dioxide, 0.5 part of wear-resisting agent and 18.7 parts of pigment.
Comparative example 6
Comparative example 6 differs from example 1 in the preparation raw materials and proportions, and is otherwise identical, specifically: the low friction coefficient powder coating comprises the following preparation raw materials in parts by weight: 45 parts of carboxyl-terminated polyester resin A,3.4 parts of triglycidyl isocyanurate, 12 parts of hydroxyl-terminated polyester resin B,3 parts of blocked polyisocyanate, 0.9 part of flatting agent, 0.9 part of brightening agent, 0.5 part of benzoin, 10 parts of glass beads, 10 parts of talcum powder, 1 part of friction reducer, 0.8 part of polytetrafluoroethylene, 2 parts of wax powder, 0.2 part of silane coupling agent, 0.1 part of nano silicon dioxide, 0.5 part of wear-resisting agent and 9.7 parts of pigment.
Comparative example 7
Comparative example 7 differs from example 1 in that comparative example 7 was not subjected to the single screw and twin screw melt extrusion mixing treatment, and otherwise was the same as example 1.
Comparative example 8
The difference from example 1 is that the glass beads, graphite fibers, friction reducer, polytetrafluoroethylene, nano silica, and abrasion resistant agent of comparative example 8 were not subjected to the processes of stirring in a water bath, ultrasonic dispersion and bonding, and otherwise were the same as example 1.
Wherein the respective raw material components and amounts (parts by weight) of comparative examples 1 to 6 and examples 1 to 5 are shown in the following tables, respectively:
specific effects are given below for examples 1 to 5 and comparative examples 1 to 8 described above:
test example one: low coefficient of friction performance test
Referring to test standard BS7976-2-2002+a1-2013, the test results are shown in the following table:
from this table, it can be seen that the low friction coefficient powder coatings prepared in examples 1-5 have excellent low friction properties with a PTV of 32 or less;
the preparation methods of comparative examples 1 to 6 are the same as those of examples 1 to 5, and the carboxyl-terminated polyester resin A in the low-friction powder coating prepared in comparative example 1 is insufficient in addition amount, and has insufficient fluidity at the time of high-temperature curing, resulting in poor surface leveling property and thus low friction capacity; the formulation of comparative example 2 was free of polytetrafluoroethylene; the formulation of comparative example 3 was free of glass beads; the friction reducer is not added in the formula of the comparative example 4; the formulation of comparative example 5 was free of talc; comparative example 6 lacks graphite fiber in the formulation; however, the results show that the low friction performance of the low friction powder coatings prepared in comparative examples 2-6 is significantly worse than the low friction powder coatings prepared in examples 1-5, indicating that the ingredients of the present invention have a synergistic effect and the amount of each ingredient added also affects the low friction performance of the powder coatings.
The difference with the example 1 is that the glass beads, graphite fibers, antifriction agents, polytetrafluoroethylene, nano silicon dioxide and wear-resistant agents in the comparative example 7 are not subjected to melt extrusion mixing treatment of a single screw and a double screw; the difference with example 1 is that the glass beads, graphite fibers, antifriction agents, polytetrafluoroethylene, nano silica and antiwear agents in comparative example 8 are not subjected to the processes of stirring, ultrasonic dispersion and bonding in a water bath, and the other processes are the same as example 1; however, the experimental results show that the low friction performance of the low friction powder coating prepared in comparative examples 7-8 is significantly worse than that of the low friction powder coating prepared in examples 1-5, indicating that the low friction powder coating of the invention can obtain a powder coating with better low friction performance under the synergistic effect of the components and the process.
Test example two: hardness test
Referring to test standard HG/T2006-2022, the test results are shown in the following table:
from the analysis of the data in the table, it is clear that the pencil hardness of the low friction coefficient powder coating prepared by the invention reaches more than 2H, the pencil hardness analysis of the low friction coefficient powder coating prepared in comparative examples 1-8 shows that the hardness of the low friction coefficient powder coating prepared by the invention is also influenced by different components, the addition amount of the components and the preparation process.
Test example three: abrasion resistance test
Referring to the test standard GBT 1768-2006 paint and varnish abrasion resistance measuring rotary rubber grinding wheel method, the test results are shown in the following table:
from the data analysis of this table, it is evident that the abrasion resistance of the coatings formed from the low-friction-coefficient powder coatings prepared in comparative examples 1 to 8 is significantly inferior to that of the coatings formed from the low-friction-coefficient powder coatings prepared in examples 1 to 5, indicating that the low-friction-coefficient powder coatings of the present invention can obtain a low-friction-coefficient powder coating having better abrasion resistance under the synergistic effect of the components and process of the low-friction-coefficient powder coating.
Test example four: dry adhesion test
Referring to test standard HG/T2006-2022, the test results are shown in the following table:
from the data analysis of this table, it is seen that the dry adhesion of the low friction coefficient powder coating prepared according to the present invention reaches the 0 level, and has better use properties, and from the dry adhesion analysis of the low friction coefficient powder coating prepared in comparative examples 1 to 8, the components and the component proportions in the present invention also affect the adhesion of the prepared low friction coefficient powder coating.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention, and are intended to be included within the scope of the appended claims and description.
Claims (10)
1. The low friction coefficient powder coating is characterized by comprising the following preparation raw materials in parts by weight: 40 to 50 parts of carboxyl-terminated polyester resin A,3 to 3.7 parts of triglycidyl isocyanurate, 10 to 16 parts of hydroxyl-terminated polyester resin B,2.5 to 4 parts of closed polyisocyanate, 0.7 to 1 part of flatting agent, 0.7 to 1 part of brightening agent, 0.3 to 0.5 part of benzoin, 5 to 10 parts of glass beads, 10 to 20 parts of talcum powder, 0.5 to 1 part of graphite fiber, 0.5 to 1.5 parts of antifriction agent, 0.5 to 1 part of polytetrafluoroethylene, 2 to 3 parts of wax powder, 0.1 to 0.3 part of silane coupling agent, 0.05 to 0.2 part of nano silicon dioxide, 0.2 to 0.5 part of wear-resisting agent and 2 to 20 parts of pigment.
2. The low-friction-coefficient powder coating according to claim 1, wherein the carboxyl-terminated polyester resin a has an acid value of 30 to 36 mgKOH/g and a viscosity of 3500 to 4500 mpa.s at 200 ℃.
3. The low-friction powder coating according to claim 1, wherein the hydroxyl-terminated polyester resin B has a hydroxyl value of 35 to 45mgKOH/g and a viscosity of 4000 to 6000 mpa.s at 200 ℃.
4. The low-friction powder coating according to claim 1, wherein the triglycidyl isocyanurate has an epoxy equivalent weight of g/eq.ltoreq.108 at 90 ℃ to 105 ℃.
5. The low coefficient of friction powder coating according to claim 1, wherein the blocked polyisocyanate has an NCO content of 14.0 to 15.0% and the graphite fibers have a carbon content of 99% or more.
6. The low friction coefficient powder coating according to claim 1, wherein the friction reducer is prepared by mixing 0.5 to 1 part by weight of a polyamide resin and 1 to 2 parts by weight of a polyacetal, wherein the polyamide resin is a polycondensation type polymer having a CONH structure in the molecule.
7. The low coefficient of friction powder coating according to claim 1, wherein the talc has a median particle size of 5 to 25um and comprises hydrous magnesium silicate;
the wax powder is mixed wax of composite micro powder comprising polyethylene wax and polytetrafluoroethylene wax, the melting range is 130-135 ℃, and the median particle diameter is 10-15 um.
8. The low coefficient of friction powder coating of claim 1, wherein the antiwear agent is Al 2 O 3 /TiO 2 Composite powder, wherein Al 2 O 3 /TiO 2 Has a mohs hardness of 9.
9. A method for preparing a low friction coefficient powder coating according to any one of claims 1 to 8, characterized in that the method comprises the steps of:
s1, sequentially adding glass beads, graphite fibers, a friction reducer, polytetrafluoroethylene, nano silicon dioxide and an anti-wear agent into a reaction container, stirring materials in a water bath kettle at the temperature of 80-90 ℃, dispersing the materials for 2-3 hours by ultrasonic waves, and then carrying out bonding process treatment to ensure that the graphite fibers, the friction reducer, the polytetrafluoroethylene and the anti-wear agent are uniformly adsorbed on the surfaces of the glass beads to obtain a mixture A;
s2, placing the wax powder, the talcum powder, the pigment and the silane coupling agent into a stirrer for stirring at the speed of 100 PRM-150 PRM until a sticky mixture with uniform color is obtained, and then performing tabletting treatment and high-speed grinding by a coffee mill to repeatedly adhere the wax powder on the surfaces of the filler and the pigment particles to obtain a mixture B;
s3, fully and uniformly mixing carboxyl-terminated polyester resin A, triglycidyl isocyanurate, hydroxyl-terminated polyester resin B, talcum powder, closed polyisocyanate, leveling agent, brightening agent, benzoin, mixture A and mixture B by using a mixer to obtain a mixture C;
and S4, carrying out melt extrusion, tabletting, crushing, fine crushing, sieving and grading on the mixture C to obtain the low-friction-coefficient powder coating.
10. The method for preparing a low friction powder coating according to claim 9, characterized in that the step of melt extrusion of said mixture C comprises in particular:
and (3) directly feeding the mixture C into a double screw for melt extrusion again after melt extrusion of a single screw, wherein the operation frequency of the single screw is 35Hz-40Hz, and the frequency of a double screw extruder is 42Hz-50Hz.
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