CN111944344A - Indoor smokeless powder coating matting aid - Google Patents
Indoor smokeless powder coating matting aid Download PDFInfo
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- CN111944344A CN111944344A CN202010904658.0A CN202010904658A CN111944344A CN 111944344 A CN111944344 A CN 111944344A CN 202010904658 A CN202010904658 A CN 202010904658A CN 111944344 A CN111944344 A CN 111944344A
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- powder coating
- acrylic resin
- epoxy
- smokeless powder
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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
-
- 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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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Paints Or Removers (AREA)
Abstract
The invention discloses an indoor smokeless powder coating extinction auxiliary agent, which consists of acrylic resin, synthetic wax, an accelerant and a metal compound; the acrylic resin accounts for 60-90% of the total amount of the auxiliary agent, the synthetic wax accounts for 5-10% of the total amount of the auxiliary agent, the accelerator accounts for 5-20% of the total amount of the auxiliary agent, and the metal compound accounts for 5-15% of the total amount of the auxiliary agent. The extinction auxiliary agent for the indoor smokeless powder coating can effectively solve the problem that smoke is generated due to high-temperature baking in the preparation process of the polyester/epoxy extinction powder coating at present.
Description
Technical Field
The invention relates to the technical field of powder coating additives, in particular to an indoor smokeless powder coating matting additive.
Background
The powder coating is a green coating without organic solvent, and has the characteristics of no solvent, environmental protection, high utilization rate (up to 99 percent) and the like. For the coating industry, the country specifies environmental friendly (low VOC) coatings as a class of industry encouraging development, which is a significant benefit policy for powder coatings. With the policy of changing paint powder released by the state, the share of the powder coating in the coating industry is continuously enlarged, and downstream use enterprises are more and more favored to green and environment-friendly powder.
The powder coating is divided into indoor and outdoor powder coatings, the indoor powder coating is divided into polyester/epoxy and pure epoxy type, and the outdoor powder coating mainly comprises polyester/TGIC. The paint is divided into high-gloss (more than 80 degrees), flat-gloss (50-70 degrees), matte (10-50 degrees) and dull (less than 10 degrees) powder paint according to the gloss classification. Matte and matte powders are prepared by adding a matting aid to achieve the desired gloss. Currently, indoor powder coatings are based on polyester/epoxy open type, and the flatting agents used are roughly divided into: reactive and non-reactive.
The reactive flatting agent has good flatting effect in polyester/epoxy powder coating, has very good performances such as leveling property, mechanical property (impact), yellowing resistance, plate surface fullness and the like, and is a mainstream flatting agent in the market at present. However, the matting agent has the following disadvantages: when the matting assistant is added into polyester/epoxy powder paint to prepare matte or dull powder paint, a small amount of smoke is emitted at high temperature (140-200 ℃) due to metal salt in the baking process, and the metal salt reacts with carboxyl acrylic resin with high acid value at high temperature to generate smoke.
With the increase of public awareness of ecological environment, the market demand for smokeless matting agents is increasing.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide an indoor smokeless powder coating extinction auxiliary agent, and solves the problem that smoke is generated due to high-temperature baking in the preparation process of polyester/epoxy extinction powder coating at present.
In order to achieve the purpose, the invention provides the following technical scheme:
an indoor smokeless powder paint extinction assistant is composed of acrylic resin, synthetic wax, promoter and metallic compound.
The invention comprises the following steps: firstly, metal salts such as stearic acid, zinc stearate, calcium stearate and the like are not added, so that the carboxyl acrylic resin and the epoxy resin form a simple carboxylic acid reaction; secondly, smoke is prevented from being generated by adding smoke inhibitors such as aluminum hydroxide, magnesium hydroxide, zinc borate and the like.
Preferably, the acrylic resin accounts for 60-90% of the total amount of the auxiliary agent, the synthetic wax accounts for 5-10% of the total amount of the auxiliary agent, the accelerator accounts for 5-20% of the total amount of the auxiliary agent, and the metal compound accounts for 5-15% of the total amount of the auxiliary agent.
In the formulations of the present invention, the amount of acrylic resin may be determined according to the gloss range, such as: when the design gloss is 2 to 15 degrees, the amount of the acrylic resin can be increased appropriately, and when the design gloss is more than 15 degrees, the amount of the acrylic resin can be decreased appropriately. In the formula, the amount of the designed acrylic resin accounts for 60-90% of the total amount of the auxiliary agent, and the better smoke abatement and extinction effects can be realized by matching with the amount of other components.
Preferably, the acrylic resin is epoxy acrylic resin and carboxyl acrylic resin.
Preferably, the epoxy acrylic resin is a copolymer of Glycidyl Methacrylate (GMA) and other (meth) acrylate monomers (which may be any one or more methacrylate monomers other than GMA). GMA is a widely used acrylate monomer, and can provide reactive epoxy groups to acrylic resin.
The epoxy equivalent of the epoxy-based acrylic resin suitable for the extinction assistant is 200-800, based on the formula disclosed by the invention, because the extinction effect is not ideal when the epoxy equivalent is too high, and the cost is too high when the epoxy equivalent is too low, the epoxy equivalent cannot be normally applied in an industrial manner, and experiments in combination with the invention prove that the optimal range of the epoxy equivalent of the epoxy-based acrylic resin is 300-600, and the effect can reach the best.
Preferably, the carboxyl acrylic resin is methacrylic acid or a copolymer of acrylic acid and other (meth) acrylate monomers, and based on the formula of the invention, the acid value of the acrylic resin is selected to be within a certain range, so that industrial production and application are difficult according to the current technology when the acid value is more than 300, and a delustering effect is difficult to realize when the acid value is too low, and therefore, the resin acid value of the carboxyl acrylic resin is selected to be 100-300.
Preferably, the epoxy acrylic resin accounts for 10-50% of the total resin; the carboxyl acrylic resin accounts for 50-90% of the total resin.
Preferably, the synthetic wax is one or more of polyethylene wax, polypropylene wax, and amide wax (ethylene bis stearamide, EBS). The synthetic wax has the following effects in the formula of the invention: 1. helping extinction; 2. the surface fullness is improved.
Preferably, the accelerant is 2-mercaptobenzothiazole Zinc (ZMBT) capable of promoting the crosslinking reaction of carboxyl and epoxy. Compared with other accelerators, the zinc 2-mercaptobenzothiazole accelerates the reaction of carboxyl and epoxy groups slowly, is just suitable for powder coating application, and the slow reaction speed is one of the core points of the application of the zinc 2-mercaptobenzothiazole (ZMBT) in the invention.
Preferably, the metal compound is one or more of aluminum hydroxide, magnesium hydroxide and zinc borate. The smoke-eliminating powder paint has certain smoke-eliminating effect in high molecular material, such as aluminum hydroxide, magnesium hydroxide, zinc borate, etc. and is used in powder paint for the first time.
The extinction auxiliary agent for the indoor smokeless powder coating can effectively solve the problem that smoke is generated due to high-temperature baking in the preparation process of the polyester/epoxy extinction powder coating at present.
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: GMA300, which means an epoxy acrylic resin having an equivalent weight of 300, and so on; the carboxyl acrylic resins of different acid values are expressed as: AR150, a carboxyl acrylic resin with an acid number of 150, and so on.
For convenience of description, in the synthetic wax, ethylene bis stearamide is expressed as EBS; polyethylene wax is expressed as PE; the polypropylene wax is expressed as PP.
For convenience of description, among the metal compounds, aluminum hydroxide is expressed as Al (OH)3(ii) a Expressing zinc hydroxide as Zn (OH)2(ii) a Expression of zinc borate as 2ZnO 3B2O3·3.5H2O。
The accelerant is 2-mercaptobenzothiazole zinc, ZMBT for short.
Example 1:
an indoor smokeless powder paint flatting assistant is prepared from the following components in percentage by weightComprises the following components: GMA 3005-20%, AR 1505-30%, AR 23020-50%, AR 3005-20%, PE 2-10%, Al (OH)35-15% of ZMBT 5-20%, and the sum of the weight percentages of the components is 100%.
Example 2:
an indoor smokeless powder coating extinction auxiliary agent comprises the following components in percentage by weight: GMA 55010-30%, AR 2305-30%, AR 30010-50%, PE 2-10%, Al (OH)35-15% of ZMBT 5-20%, and the sum of the weight percentages of the components is 100%.
Example 3:
an indoor smokeless powder coating extinction auxiliary agent comprises the following components in percentage by weight: GMA 70010-30%, AR 1505-30%, AR 3005-60%, PP 2-10%, Zn (OH)25-15% of ZMBT 5-20%, and the sum of the weight percentages of the components is 100%.
Example 4:
an indoor smokeless powder coating extinction auxiliary agent comprises the following components in percentage by weight: GMA 5505-20%, AR 23050-70%, AR 30020-60%, EBS 2-10%, Al (OH)35-15% of ZMBT 5-20%, and the sum of the weight percentages of the components is 100%.
Example 5:
an indoor smokeless powder coating extinction auxiliary agent comprises the following components in percentage by weight: GMA 3005-20%, AR 15025-60%, AR 23030-80%, PP 2-10%, 2ZnO 3B2O3·3.5H2O5-15% and ZMBT 5-20%, wherein the sum of the weight percentages of the components is 100%.
Example 6:
a polyester/epoxy powder coating has the following formula (according to the GB/T21776-2008 standard of powder coatings) in percentage by weight:
remarking: the 1#, 2#, 3#, 4#, and 5# groups are respectively paint formulas added with the indoor smokeless powder paint extinction assistant of the invention in the examples 1-5, and the 6# and 7# groups are paint formulas added with the general powder paint extinction assistant.
The polyesters used in the experiments were commercially available general indoor 50:50 and 60:40 polyester, wherein the used polyester resin is Shenjian SJ3B (50:50), Guanghua GH1261(60:40), Tiansong 5700 (50:50) and Zhongfa 5086A (50:50), the used epoxy resin is baring petrochemical 014U, and the leveling agent is white carbon black diffusion acrylate leveling agent PV 88; the benzoin is Jiangxi middle and large benzoin, the carbon black is Sanling MA-100, and other raw materials are all commercial products.
The preparation process of the coating comprises the following steps: weighing the raw materials according to the formula, premixing the raw materials, extruding, tabletting, crushing and sieving to obtain the finished product of the powder coating.
Effect embodiment:
the finished products of the powder coatings of the groups 61# to 7# in the above embodiments are placed on an emulsifying instrument with a constant temperature of 200 ℃ for observation, wherein the powder coatings of the groups 1# to 5# prepared by respectively adopting the extinction auxiliary agents in the embodiments 1 to 5 of the invention have no smoke, and the powder coatings of the groups 6# and 7# prepared by adopting the universal extinction auxiliary agents have smoke. The specific test results are shown in the following table:
the colloidizing instrument is used for detecting the colloidizing time of the powder coating, the surface of the colloidizing instrument is a smooth round brass plate, the thickness of the instrument is 15-20 mm, the diameter of the instrument is 120mm, a hole with the diameter of 7mm and the depth of 65mm is formed in the center of the side face of the instrument, and the instrument can be used for inserting a thermometer.
The experimental results show that: the extinction auxiliary agent for the indoor smokeless powder coating can effectively solve the problem that smoke is generated due to high-temperature baking in the preparation process of the polyester/epoxy extinction powder coating at present.
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 (10)
1. An indoor smokeless powder coating extinction auxiliary agent is characterized by consisting of acrylic resin, synthetic wax, an accelerant and a metal compound.
2. The indoor smokeless powder coating extinction additive according to claim 1, wherein the acrylic resin accounts for 60-90% of the total amount of the additive, the synthetic wax accounts for 5-10% of the total amount of the additive, the accelerator accounts for 5-20% of the total amount of the additive, and the metal compound accounts for 5-15% of the total amount of the additive.
3. The indoor smokeless powder coating matting aid according to claim 1, characterized in that said acrylic resins are epoxy-based acrylic resins and carboxyl-based acrylic resins.
4. The indoor smokeless powder coating extinction auxiliary agent is characterized in that the epoxy-based acrylic resin is a copolymer of glycidyl methacrylate and one or more methacrylate monomers except the glycidyl methacrylate, and the epoxy equivalent of the epoxy-based acrylic resin is 200-800.
5. The indoor smokeless powder coating extinction auxiliary according to claim 4, wherein the epoxy-based acrylic resin has an epoxy equivalent weight of 300-600.
6. The indoor smokeless powder coating extinction auxiliary agent is characterized in that 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 100-300.
7. The indoor smokeless powder coating extinction auxiliary agent is characterized in that the epoxy acrylic resin accounts for 10-50% of the total amount of the resin; the carboxyl acrylic resin accounts for 50-90% of the total resin.
8. An indoor smokeless powder coating matting aid according to claim 1 characterised in that said synthetic wax is one or more of polyethylene wax, polypropylene wax, amide wax.
9. The indoor smokeless powder coating matting aid according to claim 1, characterized in that said accelerator is zinc 2-mercaptobenzothiazole which promotes the crosslinking reaction of carboxyl groups with epoxy groups.
10. An indoor smokeless powder coating matting aid according to claim 1 characterised in that said metal compound is one or more of aluminium hydroxide, magnesium hydroxide, zinc borate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010904658.0A CN111944344A (en) | 2020-09-01 | 2020-09-01 | Indoor smokeless powder coating matting aid |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010904658.0A CN111944344A (en) | 2020-09-01 | 2020-09-01 | Indoor smokeless powder coating matting aid |
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| CN111944344A true CN111944344A (en) | 2020-11-17 |
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| CN202010904658.0A Pending CN111944344A (en) | 2020-09-01 | 2020-09-01 | Indoor smokeless powder coating matting aid |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113621263A (en) * | 2021-08-20 | 2021-11-09 | 梧州市泽和高分子材料有限公司 | Extinction auxiliary agent for beta-Hydroxyalkylamide (HAA) powder coating body using carboxyl acrylic resin as main body |
| CN114716863A (en) * | 2022-04-25 | 2022-07-08 | 佛山市客临登新材料有限公司 | Outdoor flatting agent capable of being stored for long time and use method thereof |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113621263A (en) * | 2021-08-20 | 2021-11-09 | 梧州市泽和高分子材料有限公司 | Extinction auxiliary agent for beta-Hydroxyalkylamide (HAA) powder coating body using carboxyl acrylic resin as main body |
| CN114716863A (en) * | 2022-04-25 | 2022-07-08 | 佛山市客临登新材料有限公司 | Outdoor flatting agent capable of being stored for long time and use method thereof |
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Application publication date: 20201117 |