CN114621617A - Extinction auxiliary agent for beta-hydroxyalkylamide powder coating - Google Patents
Extinction auxiliary agent for beta-hydroxyalkylamide powder coating Download PDFInfo
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- CN114621617A CN114621617A CN202011443527.3A CN202011443527A CN114621617A CN 114621617 A CN114621617 A CN 114621617A CN 202011443527 A CN202011443527 A CN 202011443527A CN 114621617 A CN114621617 A CN 114621617A
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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
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/42—Gloss-reducing agents
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- 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
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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Abstract
The invention discloses a delustering assistant for a beta-hydroxyalkylamide powder coating, which comprises acrylic resin, dodecanedioic acid, pyromellitic acid, synthetic wax and an accelerant, wherein the acrylic resin accounts for 70-90% of the total amount of an additive, the dodecanedioic acid accounts for 5-20% of the total amount of the additive, the pyromellitic acid accounts for 3-15% of the total amount of the additive, the synthetic wax accounts for 5-15% of the total amount of the additive, and the accelerant accounts for 0.5-5% of the total amount of the additive. The extinction auxiliary agent for the beta-hydroxyalkylamide powder coating fills the blank that no special extinction auxiliary agent exists in the field of the existing beta-Hydroxyalkylamide (HAA) powder coating, can adjust the glossiness of the coating from 3-60 degrees, and solves the problems of poor extinction effect and rough surface after coating of the existing beta-Hydroxyalkylamide (HAA) powder coating.
Description
Technical Field
The invention relates to the technical field of powder coating additives, in particular to a flatting assistant for a beta-Hydroxyalkylamide (HAA) powder coating.
Background
The powder coating is 100 percent of powder coating without organic solvent, and has the characteristics of environmental protection, high utilization rate (up to 99 percent), high coating efficiency and the like. For the coating industry, the state clearly indicates that environmentally friendly (low VOC) coatings are a significant benefit for powder coatings as an industry of encouraging development. With the policy of changing paint powder released by the state, the share of the powder coating in the coating industry is not only enlarged, but also downstream use enterprises are more and more favored to green and environment-friendly powder materials.
Powder coatings are divided into indoor and outdoor powder coatings, the indoor powder coatings are divided into polyester/epoxy and pure epoxy types, and the outdoor powder coatings are divided into polyester/TGIC, beta-hydroxyalkylamide systems (HAA). At present, the outdoor powder coating mainly uses polyester/TGIC and beta-hydroxyalkylamide system (HAA), like the beta-hydroxyalkylamide system (HAA) in Japan and Europe, and the polyester/TGIC is still used in large quantities in China, America, India and other countries. The use of TGIC is also increasingly restricted domestically. TGIC (isocyanurate) has been shown in experiments to be slightly toxic, may cause allergy when in contact with skin, and is seriously harmful to health when swallowed or in long-term contact. Moreover, TGIC is not stable and is supplied by raw materials and processes. beta-Hydroxyalkylamide (HAA) is currently the most mature curing agent for outdoor powder coatings, except TGIC, and it is stable in supply, non-toxic, and non-hazardous to humans.
However, β -Hydroxyalkylamide (HAA) powder coatings also suffer from the following drawbacks: 1. the coating cannot be thick coated, and pinholes are easy to generate if the coating is thick; 2. the paint is not high temperature resistant and is easy to yellow; 3. suitable matting aids are not available when made into matte or matte powders. At present, the problems of incapability of thick coating and low high temperature resistance and easy yellowing are gradually solved by improving the process. However, the matting of the β -Hydroxyalkylamide (HAA) systems can only be achieved by blending (or dry blending) polyesters of high and low acid number, the gloss is generally only up to a minimum of 30 degrees, and the surface of the applied paint is relatively rough. With the improvement of the aesthetic quality of people, the demand of matte and dull powder is increasing, so that a better-quality beta-Hydroxyalkylamide (HAA) system powder coating matting assistant is urgently needed.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a matting assistant for a beta-hydroxyalkylamide powder coating to fill the gap in the aspect of the prior art, can adjust the glossiness of the coating from 3-60 degrees, and solves the problems of poor matting effect and rough surface after coating of the prior beta-Hydroxyalkylamide (HAA) system powder coating.
In order to achieve the purpose, the invention provides the following technical scheme:
a matting assistant for beta-hydroxyalkylamide powder paint contains acrylic resin, dodecanedioic acid, pyromellitic acid, synthetic wax and promoter.
Preferably, the acrylic resin accounts for 70-90% of the total amount of the additive, the dodecanedioic acid accounts for 5-20% of the total amount of the additive, the pyromellitic acid accounts for 3-15% of the total amount of the additive, the synthetic wax accounts for 5-15% of the total amount of the additive, and the accelerator accounts for 0.5-5% of the total amount of the additive.
Preferably, the acrylic resin includes epoxy acrylic resin and carboxyl acrylic resin.
Preferably, the epoxy acrylic resin is a copolymer of glycidyl methacrylate and one or more methacrylate monomers except Glycidyl Methacrylate (GMA), the GMA is a widely used acrylate resin and can endow the acrylate resin with reactive epoxy groups, and the epoxy equivalent of the epoxy acrylic resin is 600-1400, and the optimal range is 600-1000.
Preferably, the carboxyl acrylic resin is methacrylic acid or a copolymer of acrylic acid and other methacrylate monomers, and the resin acid value of the carboxyl acrylic resin is 50-260.
Preferably, the epoxy acrylic resin accounts for 30-70% of the total resin; the carboxyl acrylic resin accounts for 20-60% of the total resin.
Preferably, the accelerator is a compound that can accelerate the crosslinking reaction of carboxyl groups and epoxy groups.
Preferably, the accelerator comprises 2-mercaptobenzothiazole zinc, dimethyl imidazole, diphenyl imidazole line and ammonium bromide.
Compared with the prior art, the invention has the following advantages:
the extinction auxiliary agent for the beta-hydroxyalkylamide powder coating fills the blank that no special extinction auxiliary agent exists in the field of the existing beta-Hydroxyalkylamide (HAA) powder coating, can adjust the glossiness of the coating from 3-60 degrees, and solves the problems of poor extinction effect and rough surface after coating of the existing beta-Hydroxyalkylamide (HAA) powder coating.
Extinction principle: the complex reaction system is utilized to make microscopic unevenness on the surface of the coating film so as to achieve the light extinction effect. Such as: 1. the epoxy acrylic resin reacts with the carboxyl acrylic resin and also reacts with the unsaturated polyester; 2. the beta-hydroxyalkylamide reacts with the unsaturated polyester and also with the carboxy acrylic resin. The addition of the accelerator can promote the uneven speed of the coating in the reaction shrinkage process to cause microscopic unevenness on the surface of the coating, thereby realizing the extinction.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto. The reagents, equipment and methods employed in the present invention are all reagents, equipment and methods conventionally available in the art and conventionally used methods, unless otherwise specified.
For convenience of description, epoxy-based (GMA) acrylic resins of different epoxy equivalent weights are expressed as: g600, namely the epoxy acrylic resin with the equivalent weight of 600, and the like; the carboxyl acrylic resins of different acid values are expressed as: a100, which is a carboxyl acrylic resin with an acid value of 100, and so on.
For convenience of description, the accelerator zinc 2-mercaptobenzothiazole is expressed as ZMBT, dimethylimidazole is expressed as imidazole, diphenylimidazoline is expressed as imidazoline, ammonium bromide is expressed as NH4Br, dodecanedioic acid is expressed as DDDA, pyromellitic acid is expressed as PMDA, ethylene bis stearamide is expressed as EBS, polyethylene wax is expressed as PE, and polypropylene wax is expressed as PP.
Example 1:
a matting aid for beta-hydroxyalkylamide powder coatings, consisting of, in weight percent: g60010-25%, G90020-40%, A7020-40%, PE 2-10%, PP 5-10%, imidazole 0.5-5%, ZMBT 5-10%, and the sum of the weight percentages of the components is 100%.
Example 2:
a matting aid for beta-hydroxyalkylamide powder coatings, consisting of, in weight percent: g70020-50%, G90010-30%, A10010-30%, DDDA 5-10%, PE 2-10%, PP 5-10%, imidazole 1-5%, ZMBT 5-10%, and the sum of the weight percentages of the components is 100%.
Example 3:
a matting aid for beta-hydroxyalkylamide powder coatings, consisting of, in weight percent: 10-30% of G600, 30-60% of G90030, 10-60% of A16010, 5-10% of PMDA, 5-10% of PP, 2-10% of EBS, 1-5% of imidazoline and 5-10% of ZMBT, wherein the sum of the weight percentages of the components is 100%.
Example 4:
a matting aid for beta-hydroxyalkylamide powder coatings, consisting of, in weight percent: g60020-40%, G70010-30%, A7020-40%, PE 5-10%, PP 5-10%, and ammonium bromide 2-10%, wherein the sum of the weight percentages of the components is 100%.
Example 5:
a matting aid for beta-hydroxyalkylamide powder coatings, consisting of, in weight percent: g70010-30%, G120030-60%, A10020-40%, PE 5-10%, PP 5-10%, ZMBT 5-10%, and the sum of the weight percentages of all the components is 100%.
Example 6:
a matting aid for beta-hydroxyalkylamide powder coatings, consisting of, in weight percent: g60010-30%, G90020-40%, A10030-50%, PE 2-10%, EBS 5-10% and ZMBT 5-10%, wherein the sum of the weight percentages of the components is 100%.
Example 7:
a matting aid for beta-hydroxyalkylamide powder coatings, consisting of, in weight percent: g90030-60%, G120020-40%, A7020-40%, DDDA 5-15%, PDMA 3-10%, PP 5-10%, EBS 2-10%, imidazoline 0.5-5%, ZMBT 5-10%, and the sum of the weight percentages of all the components is 100%.
Example 8:
a beta-hydroxyalkylamide system powder coating, the formulation of which is as follows (reference to powder coating GB/T21776-2008 standard) in weight percent:
the 1#, 2#, 3#, 4#, 5#, 6# and 7# groups are respectively 7 groups of beta-hydroxyalkylamide system powder coatings, the flatting agents in the 7 groups of coatings sequentially adopt the flatting auxiliaries in the examples 1-7, and the data in the table show that the gloss of the powder coatings added with the flatting agent can be adjusted from 3-60 degrees.
The polyesters used in the experiments were commercially available general β -hydroxyalkylamide system curing polyesters (95:5, 96:4 and 96.5:3.5 polyesters); the polyester resin is Shenjiangding (DSM) P847(96:4), P865(95:5), P835(96.5:3.5), P870(93:7), Guanghua GH3320(95:5), HG4406(93:7), GH4407(97:3), Tiansong CE3068 (95:5) and Tiantian 6583(95: 5); the beta-Hydroxyalkylamide (HAA) is Shanghai Yao E350; the leveling agent is white carbon black diffusion acrylate leveling agent PV 88; the Benzonum is Jiangxi middle-sized Benzonum; the carbon black is Sanling MA-100; other raw materials are also commercial products.
The preparation process of the coating comprises the following steps: the preparation method is consistent with the traditional powder coating preparation process, the raw materials are weighed according to the formula, and the finished product of the powder coating is obtained by premixing, extruding, tabletting, crushing and sieving the raw materials.
The extinction assistant for beta-Hydroxyalkylamide (HAA) system powder coating of the invention
Technical Field
The invention relates to the technical field of powder coating additives, in particular to a flatting assistant for a beta-Hydroxyalkylamide (HAA) powder coating.
Background
The powder coating is 100 percent of powder coating without organic solvent, and has the characteristics of environmental protection, high utilization rate (up to 99 percent), high coating efficiency and the like. For the coating industry, the country clearly points out that environment-friendly (low VOC) coatings are a great benefit for powder coatings as a class of industry encouraging development. With the policy of changing paint powder released by the state, the share of the powder coating in the coating industry is not only enlarged, but also downstream use enterprises are more and more favored to green and environment-friendly powder materials.
Powder coatings are divided into indoor and outdoor powder coatings, the indoor powder coatings are divided into polyester/epoxy and pure epoxy types, and the outdoor powder coatings are divided into polyester/TGIC, beta-hydroxyalkylamide systems (HAA). At present, the outdoor powder coating mainly uses polyester/TGIC and beta-hydroxyalkylamide system (HAA), like the beta-hydroxyalkylamide system (HAA) in Japan and Europe, and the polyester/TGIC is still used in large quantities in China, America, India and other countries. The use of TGIC is also increasingly restricted domestically. TGIC (isocyanurate) has been shown in experiments to be slightly toxic, may cause allergy when in contact with skin, and is seriously harmful to health when swallowed or in long-term contact. Moreover, TGIC is not stable and is supplied by raw materials and processes. beta-Hydroxyalkylamide (HAA) is currently the most mature curing agent for outdoor powder coatings, except TGIC, and it is stable in supply, non-toxic, and non-hazardous to humans.
However, β -Hydroxyalkylamide (HAA) powder coatings also suffer from the following drawbacks: 1. the coating cannot be thick coated, and pinholes are easy to generate if the coating is thick; 2. the paint is not high temperature resistant and is easy to yellow; 3. suitable matting aids are not available when made into matte or matte powders. At present, the problems of incapability of thick coating and low high temperature resistance and easy yellowing are gradually solved by improving the process. However, the matting of the β -Hydroxyalkylamide (HAA) systems can only be achieved by blending (or dry blending) polyesters of high and low acid number, the gloss is generally only up to a minimum of 30 degrees, and the surface of the applied paint is relatively rough. With the improvement of the aesthetic quality of people, the demand of matte and dull powder is increasing, so that a better-quality beta-Hydroxyalkylamide (HAA) system powder coating matting assistant is urgently needed.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a matting assistant for a beta-hydroxyalkylamide powder coating to fill the gap in the aspect of the prior art, can adjust the glossiness of the coating from 3-60 degrees, and solves the problems of poor matting effect and rough surface after coating of the prior beta-Hydroxyalkylamide (HAA) system powder coating.
In order to achieve the purpose, the invention provides the following technical scheme:
a matting assistant for beta-hydroxyalkylamide powder paint contains acrylic resin, dodecanedioic acid, pyromellitic acid, synthetic wax and promoter.
Preferably, the acrylic resin accounts for 70-90% of the total amount of the additive, the dodecanedioic acid accounts for 5-20% of the total amount of the additive, the pyromellitic acid accounts for 3-15% of the total amount of the additive, the synthetic wax accounts for 5-15% of the total amount of the additive, and the accelerator accounts for 0.5-5% of the total amount of the additive.
Preferably, the acrylic resin includes epoxy acrylic resin and carboxyl acrylic resin.
Preferably, the epoxy acrylic resin is a copolymer of glycidyl methacrylate and one or more methacrylate monomers except Glycidyl Methacrylate (GMA), the GMA is a widely used acrylate resin and can endow the acrylate resin with reactive epoxy groups, and the epoxy equivalent of the epoxy acrylic resin is 600-1400, and the optimal range is 600-1000.
Preferably, the carboxyl acrylic resin is methacrylic acid or a copolymer of acrylic acid and other methacrylate monomers, and the resin acid value of the carboxyl acrylic resin is 50-260.
Preferably, the epoxy acrylic resin accounts for 30-70% of the total resin; the carboxyl acrylic resin accounts for 20-60% of the total resin.
Preferably, the accelerator is a compound that can accelerate the crosslinking reaction of carboxyl groups and epoxy groups.
Preferably, the accelerator comprises 2-mercaptobenzothiazole zinc, dimethyl imidazole, diphenyl imidazole line and ammonium bromide.
Compared with the prior art, the invention has the following advantages:
the extinction auxiliary agent for the beta-hydroxyalkylamide powder coating fills the blank that no special extinction auxiliary agent exists in the field of the existing beta-Hydroxyalkylamide (HAA) powder coating, can adjust the glossiness of the coating from 3-60 degrees, and solves the problems of poor extinction effect and rough surface after coating of the existing beta-Hydroxyalkylamide (HAA) powder coating.
Extinction principle: the complex reaction system is utilized to make microscopic unevenness on the surface of the coating film so as to achieve the light extinction effect. Such as: 1. the epoxy acrylic resin reacts with the carboxyl acrylic resin and also reacts with the unsaturated polyester; 2. the beta-hydroxyalkylamide reacts with the unsaturated polyester and also with the carboxy acrylic resin. The addition of the accelerator can promote the uneven speed of the coating in the reaction shrinkage process to cause microscopic unevenness on the surface of the coating, thereby realizing the extinction.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto. The reagents, equipment and methods employed in the present invention are all reagents, equipment and methods conventionally available in the art and conventionally used methods, unless otherwise specified.
For convenience of description, epoxy-based (GMA) acrylic resins of different epoxy equivalent weights are expressed as: g600, namely the epoxy acrylic resin with the equivalent weight of 600, and the like; the carboxyl acrylic resins of different acid values are expressed as: a100, which is a carboxyl acrylic resin with an acid value of 100, and so on.
For convenience of description, the accelerator zinc 2-mercaptobenzothiazole is expressed as ZMBT, dimethylimidazole is expressed as imidazole, diphenylimidazoline is expressed as imidazoline, ammonium bromide is expressed as NH4Br, dodecanedioic acid is expressed as DDDA, pyromellitic acid is expressed as PMDA, ethylene bis stearamide is expressed as EBS, polyethylene wax is expressed as PE, and polypropylene wax is expressed as PP.
Example 1:
a matting aid for beta-hydroxyalkylamide powder coatings is composed of the following components in percentage by weight: g60010-25%, G90020-40%, A7020-40%, PE 2-10%, PP 5-10%, imidazole 0.5-5%, ZMBT 5-10%, and the sum of the weight percentages of the components is 100%.
Example 2:
a matting aid for beta-hydroxyalkylamide powder coatings, consisting of, in weight percent: g70020-50%, G90010-30%, A10010-30%, DDDA 5-10%, PE 2-10%, PP 5-10%, imidazole 1-5%, ZMBT 5-10%, and the sum of the weight percentages of the components is 100%.
Example 3:
a matting aid for beta-hydroxyalkylamide powder coatings, consisting of, in weight percent: g60010-30%, G90030-60%, A16010-60%, PMDA 5-10%, PP 5-10%, EBS 2-10%, imidazoline 1-5% and ZMBT 5-10%, wherein the sum of the weight percentages of the components is 100%.
Example 4:
a matting aid for beta-hydroxyalkylamide powder coatings, consisting of, in weight percent: g60020-40%, G70010-30%, A7020-40%, PE 5-10%, PP 5-10%, and ammonium bromide 2-10%, wherein the sum of the weight percentages of the components is 100%.
Example 5:
a matting aid for beta-hydroxyalkylamide powder coatings, consisting of, in weight percent: g70010-30%, G120030-60%, A10020-40%, PE 5-10%, PP 5-10%, ZMBT 5-10%, and the sum of the weight percentages of the components is 100%.
Example 6:
a matting aid for beta-hydroxyalkylamide powder coatings, consisting of, in weight percent: g60010-30%, G90020-40%, A10030-50%, PE 2-10%, EBS 5-10% and ZMBT 5-10%, wherein the sum of the weight percentages of the components is 100%.
Example 7:
a matting aid for beta-hydroxyalkylamide powder coatings, consisting of, in weight percent: g90030-60%, G120020-40%, A7020-40%, DDDA 5-15%, PDMA 3-10%, PP 5-10%, EBS 2-10%, imidazoline 0.5-5%, ZMBT 5-10%, and the sum of the weight percentages of all the components is 100%.
Example 8:
a beta-hydroxyalkylamide system powder coating, the formulation of which is as follows (reference to powder coating GB/T21776-2008 standard) in weight percent:
the 1#, 2#, 3#, 4#, 5#, 6# and 7# groups are respectively 7 groups of beta-hydroxyalkylamide system powder coatings, the flatting agents in the 7 groups of coatings sequentially adopt the flatting aids of the examples 1-7, and the data in the table show that the gloss of the powder coating added with the flatting agent can be adjusted from the range of 3-60 degrees.
The polyesters used in the experiments were commercially available general β -hydroxyalkylamide system curing polyesters (95:5, 96:4 and 96.5:3.5 polyesters); the polyester resin is Shenjiangding (DSM) P847(96:4), P865(95:5), P835(96.5:3.5), P870(93:7), Guanghua GH3320(95:5), HG4406(93:7), GH4407(97:3), Tiansong CE3068 (95:5) and Tiantian 6583(95: 5); the beta-Hydroxyalkylamide (HAA) is Shanghai Yao E350; the leveling agent is white carbon black diffusion acrylate leveling agent PV 88; the Benzonum is Jiangxi middle-sized Benzonum; the carbon black is Sanling MA-100; other raw materials are also all commercial products.
The preparation process of the coating comprises the following steps: the preparation method is consistent with the traditional powder coating preparation process, the raw materials are weighed according to the formula, and the finished product of the powder coating is obtained by premixing, extruding, tabletting, crushing and sieving the raw materials.
The powder coating finished product prepared by the extinction assistant for the beta-Hydroxyalkylamide (HAA) system powder coating has the normal film thickness of 60-90 microns, no pinholes, no yellowing phenomenon and weather resistance reaching the industrial level.
Effect example 1:
the finished powder coatings with the matting aid according to the invention were compared with powder coatings of the generic β -Hydroxyalkylamide (HAA) system (cf. powder coatings GB/T21776-2008 standard) and the results are given in the following table:
the finished product of the powder coating prepared by the agent has the normal film thickness of 60-90 microns, no pinholes, no yellowing phenomenon and weather resistance reaching the industrial level.
Effect example 1:
the finished powder coatings with the matting aid according to the invention were compared with powder coatings of the generic β -Hydroxyalkylamide (HAA) system (cf. powder coatings GB/T21776-2008 standard) and the results are given in the following table:
the data in the table show that the groups 1# to 5# are general-purpose beta-Hydroxyalkylamide (HAA) system powder coatings, and the groups 6# and 7# are finished powder coatings added with the extinction assistant, so that the extinction assistant can adjust the glossiness of the powder coatings from 3 to 60 degrees, and the problems of poor extinction effect and rough surface after coating of the existing beta-Hydroxyalkylamide (HAA) system powder coatings are solved.
Effect example 2:
the finished powder coating with the matting aid of the invention was compared with a universal beta-Hydroxyalkylamide (HAA) two-component system powder coating (cf. powder coating GB/T21776-2008 standard), the results of which are given in the following table:
in the table, the 1# to 4# groups are general-purpose beta-Hydroxyalkylamide (HAA) two-component system powder coatings, and the 5# groups, 6# groups and 7# groups are finished powder coatings added with the extinction assistant, and the data in the table show that the extinction assistant can adjust the glossiness of the powder coatings from 3 to 60 degrees, so that the problems of poor extinction effect and surface roughness after being coated of the existing beta-Hydroxyalkylamide (HAA) system powder coatings are solved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and their concepts should be considered to be equivalent or modified within the technical scope of the present invention.
Claims (9)
1. The matting assistant for beta-hydroxyalkyl amide powder paint features that it includes acrylic resin, dodecanedioic acid, pyromellitic acid, synthetic wax and promoter.
2. A matting aid for a β -hydroxyalkylamide powder coating according to claim 1 characterised in that said acrylic resin comprises 70-90% of the total additive amount, said dodecanedioic acid comprises 5-20% of the total additive amount, said pyromellitic acid comprises 3-15% of the total additive amount, said synthetic wax comprises 5-15% of the total additive amount, said accelerator comprises 0.5-5% of the total additive amount.
3. A matting aid for a β -hydroxyalkylamide powder coating according to claim 1 or 2, characterised in that said acrylic resins comprise epoxy-and carboxy-acrylic resins.
4. A matting aid for a β -hydroxyalkylamide powder coating according to claim 3 wherein the epoxy-based acrylic resin is a copolymer of glycidyl methacrylate and one or more methacrylate-based monomers other than glycidyl methacrylate, and has an epoxy equivalent weight of 600 to 1400.
5. A matting aid for β -hydroxyalkylamide powder coatings according to claim 4, wherein said epoxy acrylic resin has an epoxy equivalent weight of 600 to 1000.
6. A matting aid for β -hydroxyalkylamide powder coatings according to claim 3, wherein said carboxy acrylic resin is methacrylic acid or a copolymer of acrylic acid and other methacrylate monomers, and the carboxy acrylic resin has a resin acid value of 50-260.
7. A matting aid for β -hydroxyalkylamide powder coatings according to claim 3 characterised in that said epoxy acrylic resin represents 30-70% of the total resin; the carboxyl acrylic resin accounts for 20-60% of the total resin.
8. A matting aid for a β -hydroxyalkylamide powder coating according to claim 1 characterised in that said accelerator is a compound which can accelerate the cross-linking reaction of carboxyl groups with epoxy groups.
9. A matting aid for a β -hydroxyalkylamide powder coating according to claim 8 characterised in that said accelerator comprises zinc 2-mercaptobenzothiazole, dimethylimidazole, diphenylimidazole, ammonium bromide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011443527.3A CN114621617A (en) | 2020-12-08 | 2020-12-08 | Extinction auxiliary agent for beta-hydroxyalkylamide powder coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011443527.3A CN114621617A (en) | 2020-12-08 | 2020-12-08 | Extinction auxiliary agent for beta-hydroxyalkylamide powder coating |
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