CN113881262A - High-performance outdoor matte powder coating and preparation method thereof - Google Patents
High-performance outdoor matte powder coating and preparation method thereof Download PDFInfo
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- CN113881262A CN113881262A CN202110984726.3A CN202110984726A CN113881262A CN 113881262 A CN113881262 A CN 113881262A CN 202110984726 A CN202110984726 A CN 202110984726A CN 113881262 A CN113881262 A CN 113881262A
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- 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
- C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
- C09D4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09D159/00 - C09D187/00
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- 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
- C09D5/032—Powdery paints characterised by a special effect of the produced film, e.g. wrinkle, pearlescence, matt finish
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- 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
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- 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
- C09D5/08—Anti-corrosive paints
Abstract
The invention provides a high-performance outdoor matt powder coating which comprises the following components in parts by weight: 30-50 parts of epoxy resin, 3-8 parts of butyl acrylate, 5-10 parts of polyethylene glycol dimethyl ether, 1-4 parts of anhydride curing agent, 10-15 parts of flatting agent, 7-12 parts of polyvinyl alcohol, 0.5-1.5 parts of hindered phenol antioxidant, 1-3 parts of wollastonite and 3-5 parts of cyclohexane-1, 2-dicarboxylic acid diglycidyl ester; the epoxy resin is bisphenol A type epoxy resin; the flatting agent is prepared by modifying talcum powder, silicon dioxide and epoxy resin, and the particle size is 5-10 mu m. The powder coating has good extinction effect and good aging resistance, corrosion resistance and other properties.
Description
Technical Field
The invention relates to the technical field of powder material preparation, in particular to a high-performance outdoor matte powder coating and a preparation method thereof.
Background
The powder coating is in a completely different form from general coating, and it exists in a state of fine powder. Since no solvent is used, it is called a powder coating. The powder coating has the characteristics of no solvent, no pollution, recoverability, environmental protection, energy and resource saving, labor intensity reduction, high mechanical strength of a coating film and the like.
The matting powder coating is usually prepared by adding a matting agent having a matting effect to a powder coating formulation, and the materials of the matting agent are known to be classified into inorganic compounds and organic compounds. The inorganic compound comprises silicon oxide, aluminum oxide, calcium carbonate, barium sulfate, titanium dioxide and the like; the organic compound includes Polycarbonate (PC), Polystyrene (PS), Polymethylmethacrylate (PMMA), polyethylene, polypropylene, polyethylene terephthalate (PET), epoxy resin, and the like. If the inorganic matting agent is adopted, the problems of poor dispersibility of inorganic particles in the coating, hard precipitation in the storage process, poor mechanical property of the coating and the like can be caused, and the coating is easy to peel off, thereby seriously influencing the application of the powder coating; when the organic flatting agent is used, a good flatting effect cannot be achieved.
Disclosure of Invention
The invention aims to provide a high-performance outdoor matte powder coating and a preparation method thereof aiming at the defects of the matte powder coating in the prior art.
In order to achieve the purpose, the following technical scheme is adopted in the application:
a high-performance outdoor matt powder coating comprises the following components in parts by weight: 30-50 parts of epoxy resin, 3-8 parts of butyl acrylate, 5-10 parts of polyethylene glycol dimethyl ether, 1-4 parts of anhydride curing agent, 10-15 parts of flatting agent, 7-12 parts of polyvinyl alcohol, 0.5-1.5 parts of hindered phenol antioxidant, 1-3 parts of wollastonite and 3-5 parts of cyclohexane-1, 2-dicarboxylic acid diglycidyl ester.
Preferably, the epoxy resin is bisphenol a type epoxy resin; the flatting agent is prepared by modifying talcum powder, silicon dioxide and epoxy resin, and the particle size is 5-10 mu m.
The preparation method of any one of the high-performance outdoor matte powder coatings comprises the following steps:
s1: adding 15-30 parts of sodium silicate solution into a reaction kettle, heating to 80-90 ℃, dropwise adding 98% hydrochloric acid solution while stirring, adjusting the pH value of the reaction system to 8.3-8.7, wherein the dropwise adding rate is 1-3 drops/second, and after dropwise adding is finished, continuing to perform heat preservation reaction for 1-2 hours;
s2: adding 10-20 parts of talcum powder into the step S1, and continuing to perform heat preservation stirring reaction at the speed of 800-; filtering and washing to obtain a mixture A; adding 30-40 parts of epoxy resin into a reaction kettle, heating to 140 ℃ for 120-;
s3: adding cyclohexane-1, 2-dicarboxylic acid diglycidyl ester into the flatting agent obtained in the step S2 according to the weight part ratio, and continuously reacting for 30-50min at the temperature of 80-90 ℃; then adding epoxy resin, butyl acrylate, polyethylene glycol dimethyl ether, anhydride curing agent, polyvinyl alcohol and hindered phenol antioxidant, and fully and uniformly mixing to obtain a mixture B;
s4: and (5) putting the mixture B obtained in the step S3 into a double-screw extruder, carrying out melting, extruding and granulating, and crushing a product obtained by granulating into fine powder through a plastic crusher to obtain the high-performance outdoor matte powder coating.
Preferably, step S1 specifically includes: adding 25 parts of sodium silicate solution into a reaction kettle, heating to 85 ℃, dropwise adding 98% hydrochloric acid solution while stirring, adjusting the pH value of the reaction system to be 8.5, wherein the dropwise adding speed is 2 drops/second, and after dropwise adding, continuing to perform heat preservation reaction for 1.5 hours.
Preferably, step S2 specifically includes: adding 15 parts of talcum powder into the step S1, and continuing to keep the temperature and stir at the speed of 900r/min for reaction for 45 min; filtering and washing to obtain a mixture A; adding 35 parts of epoxy resin into a reaction kettle, heating to 130 ℃, adding 12 parts of the mixture A while stirring, continuing to react for 1.5 hours, and washing, filtering, drying and crushing to obtain the flatting agent.
Preferably, step S3 specifically includes: adding cyclohexane-1, 2-dicarboxylic acid diglycidyl ester into the flatting agent obtained in the step S2, and continuously reacting for 40min at the temperature of 85 ℃; then adding epoxy resin, butyl acrylate, polyethylene glycol dimethyl ether, anhydride curing agent, polyvinyl alcohol and hindered phenol antioxidant, and fully and uniformly mixing at the speed of 1000r/min to obtain a mixture B.
Preferably, step S4 specifically includes: putting the mixture B obtained in the step S3 into a double-screw extruder, and carrying out melting, extrusion and granulation, wherein the temperature of a zone I of the extruder is 135-155 ℃, and the temperature of a zone II of the extruder is 125-145 ℃; and (3) crushing the product obtained by granulation into fine powder with the particle size of 60-100 mu m by a plastic crusher, and sieving the fine powder by a rotary sieve with a 120-160-mesh sieve to obtain the high-performance outdoor matte powder coating.
Preferably, the temperature of the zone I of the extruder is 145-150 ℃, and the temperature of the zone II of the extruder is 130-140 ℃; the product obtained by granulation is crushed into fine powder with the particle size of 70-80 mu m by a plastic crusher and sieved by a rotary sieve with a 140-150-mesh sieve.
Has the advantages that:
1. the silicon dioxide is prepared by a precipitation method, and although the preparation method has relatively simple process conditions and lower cost, the silicon dioxide has poor structure, the structure is easy to damage under high shear, the specific surface area is small, and the pore volume is small; in order to solve the problem, the crystal form is combined with the layered crystal form talcum powder to form a three-dimensional kernel structure, so that the structure is obviously improved; meanwhile, in order to further improve the problems of dispersibility in the coating and the like, the epoxy resin is used for coating the inner core to finally form the core-shell structure flatting agent, and the grain diameter of the flatting agent is controlled to be 5-10 mu m. The flatting agent prepared by the invention has good flatting effect, obviously improved dispersity in powder coating, difficult coagulation or sedimentation, and synchronously enhanced weather resistance and corrosion resistance.
2. According to the invention, the cyclohexane-1, 2-dicarboxylic acid diglycidyl ester is adopted to modify the surface of the matting agent, so that the number of groups is increased, the steric hindrance effect is utilized to reduce the compatibility with the epoxy resin matrix of the coating main body and reduce the regular arrangement capacity of molecular chains, a micro-roughness effect is formed on the surface of the coating, when incident light reaches the micro-roughness surface, the reflection direction of the light is changed, so that diffuse reflection occurs, and the effects of matting, corrosion resistance and the like are further enhanced under the synergistic effect of the matting agent.
3. The epoxy resin is taken as a main body, and butyl acrylate and polyethylene glycol dimethyl ether are taken as auxiliary materials to improve the flexibility of the epoxy resin; and by adding hindered phenols, the weather resistance of the powder coating is further improved.
Detailed Description
The present invention is further illustrated below by reference to the following examples, which are intended to be illustrative of the invention only and are not intended to be limiting.
Example 1
S1: adding 15 parts of sodium silicate solution into a reaction kettle, heating to 80 ℃, dropwise adding 98% hydrochloric acid solution while stirring, adjusting the pH value of the reaction system to be 8.3, wherein the dropwise adding rate is 1 drop/second, and after dropwise adding is finished, continuing to perform heat preservation reaction for 1 hour;
s2: adding 10 parts of talcum powder into the step S1, and continuing to keep the temperature and stir at the speed of 800r/min for reaction for 30 min; filtering and washing to obtain a mixture A; adding 30 parts of epoxy resin into a reaction kettle, heating to 120 ℃, adding 9 parts of the mixture A while stirring, continuing to react for 1 hour, and washing, filtering, drying and crushing to obtain a flatting agent;
s3: adding 3 parts of cyclohexane-1, 2-dicarboxylic acid diglycidyl ester into 10 parts of the flatting agent obtained in the step S2, and continuously reacting for 30min at the temperature of 80 ℃; then adding 30 parts of epoxy resin, 3 parts of butyl acrylate, 5 parts of polyethylene glycol dimethyl ether, 1 part of anhydride curing agent, 10 parts of flatting agent, 7 parts of polyvinyl alcohol, 0.5 part of hindered phenol antioxidant and 1 part of wollastonite, and fully and uniformly mixing to obtain a mixture B;
s4: putting the mixture B obtained in the step S3 into a double-screw extruder, and carrying out melting, extrusion and granulation, wherein the temperature of an area I of the extruder is 135 ℃, and the temperature of an area II of the extruder is 125 ℃; and (3) crushing the product obtained by granulation into fine powder with the particle size of 60-80 mu m by a plastic crusher, and sieving the fine powder by a rotary sieve with a 120-140-mesh sieve to obtain the high-performance outdoor matte powder coating.
Example 2
S1: adding 30 parts of sodium silicate solution into a reaction kettle, heating to 90 ℃, dropwise adding 98% hydrochloric acid solution while stirring, adjusting the pH value of the reaction system to be 8.7, wherein the dropwise adding speed is 3 drops/second, and after dropwise adding, continuing to perform heat preservation reaction for 2 hours;
s2: adding 20 parts of talcum powder into the step S1, and continuing to keep the temperature and stir at the speed of 1000r/min for reaction for 50 min; filtering and washing to obtain a mixture A; adding 40 parts of epoxy resin into a reaction kettle, heating to 140 ℃, adding 15 parts of the mixture A while stirring, continuing to react for 2 hours, and washing, filtering, drying and crushing to obtain a delustering agent;
s3: adding 5 parts of cyclohexane-1, 2-dicarboxylic acid diglycidyl ester into 15 parts of the flatting agent obtained in the step S2, and continuously reacting for 50min at the temperature of 90 ℃; then adding 50 parts of epoxy resin, 8 parts of butyl acrylate, 10 parts of polyethylene glycol dimethyl ether, 4 parts of anhydride curing agent, 15 parts of flatting agent, 12 parts of polyvinyl alcohol, 1.5 parts of hindered phenol antioxidant and 3 parts of wollastonite, and fully and uniformly mixing to obtain a mixture B;
s4: putting the mixture B obtained in the step S3 into a double-screw extruder, and carrying out melting, extrusion and granulation, wherein the temperature of an area I of the extruder is 155 ℃, and the temperature of an area II of the extruder is 145 ℃; and (3) crushing the product obtained by granulation into fine powder of 80-100 mu m by a plastic crusher, and sieving by a rotary sieve with a sieve of 140-160 meshes to obtain the high-performance outdoor matte powder coating.
Example 3
S1: adding 25 parts of sodium silicate solution into a reaction kettle, heating to 85 ℃, dropwise adding 98% hydrochloric acid solution while stirring, adjusting the pH value of the reaction system to be 8.5, wherein the dropwise adding speed is 2 drops/second, and after dropwise adding, continuing to perform heat preservation reaction for 1.5 hours;
s2: adding 15 parts of talcum powder into the step S1, and continuing to keep the temperature and stir at the speed of 900r/min for reaction for 45 min; filtering and washing to obtain a mixture A; adding 35 parts of epoxy resin into a reaction kettle, heating to 130 ℃, adding 12 parts of the mixture A while stirring, continuing to react for 1.5 hours, and washing, filtering, drying and crushing to obtain a delustering agent;
s3: adding 4 parts of cyclohexane-1, 2-dicarboxylic acid diglycidyl ester into 12 parts of the flatting agent obtained in the step S2, and continuously reacting for 40min at the temperature of 85 ℃; then adding 40 parts of epoxy resin, 6 parts of butyl acrylate, 7 parts of polyethylene glycol dimethyl ether, 2 parts of anhydride curing agent, 13 parts of flatting agent, 10 parts of polyvinyl alcohol, 1 part of hindered phenol antioxidant and 2 parts of wollastonite, and fully and uniformly mixing to obtain a mixture B;
s4: putting the mixture B obtained in the step S3 into a double-screw extruder, and carrying out melting, extrusion and granulation, wherein the temperature of an area I of the extruder is 145 ℃, and the temperature of an area II of the extruder is 135 ℃; and (3) crushing the product obtained by granulation into fine powder with the particle size of 70-80 mu m by a plastic crusher, and sieving the fine powder by a rotary sieve with a 140-150-mesh sieve to obtain the high-performance outdoor matte powder coating.
Comparative example 1
Compared with the example 1, the steps S1 and S2 are lacked, the diglycidyl ester of cyclohexane-1, 2-dicarboxylic acid is lacked in the step S3, the silica flatting agent is directly added, and other steps and conditions are not changed.
Comparing with comparative example 1 and example 1, it can be seen that when silica is directly used as the matting agent, the silica is not well dispersed in the coating, and is easy to settle, agglomerate and peel off, which results in the decrease of properties such as matting, flexibility and spraying effect of the powder coating.
Comparative example 2
Compared with example 1, no talc was added in step S2, and the other steps and conditions were unchanged.
Comparing with comparative example 2 and example 1, it is known that the silica flatting agent prepared by the precipitation method has poor structure, the structure is easy to be damaged under high shear, and the performances of weather resistance, corrosion resistance, wear resistance and the like of the powder coating are reduced.
Comparative example 3
Compared with example 1, no diglycidyl cyclohexane-1, 2-dicarboxylate was added in step S3, and the other steps and conditions were unchanged.
Comparing with comparative example 3 and example 1, it is known that the surface of the powder coating is not modified by steric hindrance effect, and the compatibility is not affected, so the micro-roughness effect on the surface of the coating powder is not good, and the properties of the powder coating such as extinction and corrosion resistance are reduced.
Comparative example 4
Compared with the example 1, butyl acrylate and polyethylene glycol dimethyl ether are not added in the step S3, and other steps and conditions are not changed.
Comparing with comparative example 4 and example 1, it can be seen that the flexibility of the epoxy resin is obviously reduced in the absence of butyl acrylate and polyethylene glycol dimethyl ether, which results in poor mechanical properties and easy breakage of the powder coating.
The surface gloss, impact resistance, salt spray resistance, artificial accelerated aging, adhesive force and hardness performance test is carried out according to GB/T21776-2008 'Standard guide for detecting powder coating and coating thereof'; the bending test was according to GB/T6742-2007.
The above examples and comparative examples were tested and the results are as follows:
the above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above embodiment, but equivalent modifications or changes made by those skilled in the art according to the present disclosure should be included in the scope of the present invention as set forth in the appended claims.
Claims (8)
1. The high-performance outdoor matt powder coating is characterized by comprising the following components in parts by weight: 30-50 parts of epoxy resin, 3-8 parts of butyl acrylate, 5-10 parts of polyethylene glycol dimethyl ether, 1-4 parts of anhydride curing agent, 10-15 parts of flatting agent, 7-12 parts of polyvinyl alcohol, 0.5-1.5 parts of hindered phenol antioxidant, 1-3 parts of wollastonite and 3-5 parts of cyclohexane-1, 2-dicarboxylic acid diglycidyl ester.
2. The high performance outdoor matte powder coating according to claim 1, wherein said epoxy resin is bisphenol a type epoxy resin; the flatting agent is prepared by modifying talcum powder, silicon dioxide and epoxy resin, and the particle size is 5-10 mu m.
3. A preparation method of a high-performance outdoor matte powder coating is characterized by comprising the following steps:
s1: adding 15-30 parts of sodium silicate solution into a reaction kettle, heating to 80-90 ℃, dropwise adding 98% hydrochloric acid solution while stirring, adjusting the pH value of the reaction system to 8.3-8.7, wherein the dropwise adding rate is 1-3 drops/second, and after dropwise adding is finished, continuing to perform heat preservation reaction for 1-2 hours;
s2: adding 10-20 parts of talcum powder into the step S1, and continuing to perform heat preservation stirring reaction at the speed of 800-; filtering and washing to obtain a mixture A; adding 30-40 parts of epoxy resin into a reaction kettle, heating to 140 ℃ for 120-;
s3: adding cyclohexane-1, 2-dicarboxylic acid diglycidyl ester into the flatting agent obtained in the step S2 according to the weight part ratio, and continuously reacting for 30-50min at the temperature of 80-90 ℃; then adding epoxy resin, butyl acrylate, polyethylene glycol dimethyl ether, anhydride curing agent, polyvinyl alcohol and hindered phenol antioxidant, and fully and uniformly mixing to obtain a mixture B;
s4: and (5) putting the mixture B obtained in the step S3 into a double-screw extruder, carrying out melting, extruding and granulating, and crushing a product obtained by granulating into fine powder through a plastic crusher to obtain the high-performance outdoor matte powder coating.
4. The method for preparing the high-performance outdoor matte powder coating according to claim 3, wherein the step S1 specifically comprises: adding 25 parts of sodium silicate solution into a reaction kettle, heating to 85 ℃, dropwise adding 98% hydrochloric acid solution while stirring, adjusting the pH value of the reaction system to be 8.5, wherein the dropwise adding speed is 2 drops/second, and after dropwise adding, continuing to perform heat preservation reaction for 1.5 hours.
5. The method for preparing the high-performance outdoor matte powder coating according to claim 3, wherein the step S2 specifically comprises: adding 15 parts of talcum powder into the step S1, and continuing to keep the temperature and stir at the speed of 900r/min for reaction for 45 min; filtering and washing to obtain a mixture A; adding 35 parts of epoxy resin into a reaction kettle, heating to 130 ℃, adding 12 parts of the mixture A while stirring, continuing to react for 1.5 hours, and washing, filtering, drying and crushing to obtain the flatting agent.
6. The method for preparing the high-performance outdoor matte powder coating according to claim 3, wherein the step S3 specifically comprises: adding cyclohexane-1, 2-dicarboxylic acid diglycidyl ester into the flatting agent obtained in the step S2, and continuously reacting for 40min at the temperature of 85 ℃; then adding epoxy resin, butyl acrylate, polyethylene glycol dimethyl ether, anhydride curing agent, polyvinyl alcohol and hindered phenol antioxidant, and fully and uniformly mixing at the speed of 1000r/min to obtain a mixture B.
7. The method for preparing the high-performance outdoor matte powder coating according to claim 3, wherein the step S4 specifically comprises: putting the mixture B obtained in the step S3 into a double-screw extruder, and carrying out melting, extrusion and granulation, wherein the temperature of a zone I of the extruder is 135-155 ℃, and the temperature of a zone II of the extruder is 125-145 ℃; and (3) crushing the product obtained by granulation into fine powder with the particle size of 60-100 mu m by a plastic crusher, and sieving the fine powder by a rotary sieve with a 120-160-mesh sieve to obtain the high-performance outdoor matte powder coating.
8. The method for preparing high-performance outdoor matte powder coating according to claim 7, wherein the temperature of the first zone of the extruder is 145-150 ℃, and the temperature of the second zone of the extruder is 130-140 ℃; the product obtained by granulation is crushed into fine powder with the particle size of 70-80 mu m by a plastic crusher and sieved by a rotary sieve with a 140-150-mesh sieve.
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Cited By (1)
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| CN117820936A (en) * | 2024-03-06 | 2024-04-05 | 广东睿智环保科技股份有限公司 | Preparation method and application of diffuse reflection powder coating |
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