CN113321962A - Antistatic powder coating and preparation method thereof - Google Patents
Antistatic powder coating and preparation method thereof Download PDFInfo
- Publication number
- CN113321962A CN113321962A CN202110654555.8A CN202110654555A CN113321962A CN 113321962 A CN113321962 A CN 113321962A CN 202110654555 A CN202110654555 A CN 202110654555A CN 113321962 A CN113321962 A CN 113321962A
- Authority
- CN
- China
- Prior art keywords
- powder coating
- melt extrusion
- antistatic
- treatment
- antistatic powder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/24—Electrically-conducting 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
- 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
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/03—Powdery paints
- C09D5/033—Powdery paints characterised by the additives
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/03—Powdery paints
- C09D5/033—Powdery paints characterised by the additives
- C09D5/037—Rheology improving agents, e.g. flow control agents
-
- 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
- C08K2201/00—Specific properties of additives
- C08K2201/001—Conductive additives
-
- 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
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/04—Antistatic
Abstract
The invention provides an antistatic powder coating, which comprises carboxyl-terminated polyester resin A, carboxyl-terminated polyester resin B, triglycidyl isocyanurate, a dispersing agent, conductive carbon black, a carbon nano tube, a hardening filler, a leveling agent, a first auxiliary agent, a second auxiliary agent, a brightening agent, benzoin, polytetrafluoroethylene and pigment; according to the invention, after the hardening filler is mixed with the modified wax and the carboxylic acid derivative, the dispersion degree and compatibility of the hardening filler in a powder coating system are improved, polyacrylate is used as a surface auxiliary agent, the leveling property and defoaming effect of the powder coating system are obviously improved, the synergistic effect is achieved, and the antistatic performance of the prepared powder coating is obviously improved; the carbon nano tube and the carbon black exist in a powder coating system in a mode of a fine particle reinforced phase, and the weather resistance of the coating is still excellent after the carbon nano tube and the carbon black are used for a long time under the interaction of the components.
Description
Technical Field
The invention relates to the field of preparation of powder coatings, in particular to an antistatic powder coating and a preparation method thereof.
Background
Static electricity is generated when two substances are separated after being brought into close contact, one substance transfers electrons to the other substance to be positively charged, and the other substance receives electrons to be negatively charged. Although the electrostatic capacity is not large, the voltage is high, so that discharge is easy to occur to generate electrostatic sparks to cause explosion, and the static electricity can influence the normal operation of daily equipment. The powder coating can be sprayed in some daily equipment to form a coating with protection, decoration and special functions on the surface of the equipment, but the coating formed by the powder coating in the prior art cannot play an excellent anti-static role, static accumulation is often generated by friction of dust in gas or air, and static discharge is caused to further damage the equipment along with the static accumulation to a certain degree, so that fire or explosion accidents occur. In addition, the prior art has the problems that the components in the antistatic coating are more, the raw materials cannot be fully dispersed, particularly, the receptivity of the filler is poor, and the antistatic performance and the weather resistance of the coating are reduced along with the passage of time.
In conclusion, the above problems still remain to be solved in the field of preparing antistatic powder coating.
Disclosure of Invention
Based on the above, in order to solve the problems that the raw materials of the antistatic powder coating in the prior art cannot be fully dispersed, the filler receptivity is poor, and the antistatic performance and the weather resistance of a coating are reduced, the invention provides the antistatic powder coating, and the specific technical scheme is as follows:
the antistatic powder coating comprises the following preparation raw materials in percentage by mass:
the sum of the mass percentages of the materials is 100 percent;
the first auxiliary agent is polyacrylate, and the second auxiliary agent is a mixture of modified wax and carboxylic acid derivatives.
Further, the acid value of the carboxyl-terminated polyester resin A is 19-24mgKOH/g, the viscosity at 200 ℃ is 3000-3500 mPa.s, and the TG is more than or equal to 62 ℃.
Further, the acid value of the carboxyl-terminated polyester resin B is 48-60mgKOH/g, the viscosity at 200 ℃ is 5000-6000 mPa.s, and the TG is more than or equal to 70 ℃.
Further, the conductive carbon black has a median average particle diameter of 15nm to 20nm and a specific surface area of 120m2/g-135m2(ii) a resistivity of 0.9 to 1.2. omega. m.
Further, the hardening filler is quartz powder, and the median average particle size of the quartz powder is 5-8 μm.
Further, the leveling agent is polysiloxane modified polyether or polyester modified polyether.
In addition, the invention also provides a preparation method of the antistatic powder coating, which comprises the following steps:
placing the hardening filler into a mixing kettle, adding a second auxiliary agent, fully and uniformly mixing, placing into a medium water bath kettle at the temperature of 65-85 ℃, vibrating for 8-15 min, extruding under the pressure condition of 45-55 MPa, and finally performing first crushing to obtain a mixture A;
continuously adding carboxyl-terminated polyester resin A, carboxyl-terminated polyester resin B, triglycidyl isocyanurate, a dispersing agent, conductive carbon black, carbon nano tubes, hardening filler, a leveling agent, a first auxiliary agent, a brightening agent, benzoin, polytetrafluoroethylene and pigment into the mixing kettle, and fully and uniformly mixing to obtain a mixture B;
and carrying out melt extrusion treatment, second crushing treatment and grinding treatment on the mixture B to obtain the antistatic powder coating.
Further, the extrusion process is completed by a tablet press, and the temperature of the extrusion process is controlled to be 30-85 ℃ during the extrusion process.
Further, the first crushing treatment is: and placing the mixture after extrusion treatment in a crushing tank, wherein a mesh screen with an inclination angle of 45 degrees is arranged in the crushing tank.
Further, the melt extrusion treatment is a twin-screw melt extrusion treatment, and the process parameters of the melt extrusion treatment are as follows: the temperature of the first zone of the melt extrusion treatment is 100-120 ℃; the temperature of the second zone of the melt extrusion treatment is 130-150 ℃; the temperature of the three zones of the melt extrusion treatment is 110-140 ℃; the temperature of the four areas of the melt extrusion treatment is 120-130 ℃; the rotating speed of the host machine for melt extrusion treatment is 1800r/min-3000 r/min.
In the scheme, after the hardening filler is mixed with the modified wax and the carboxylic acid derivative, the dispersion degree of the hardening filler in a powder coating system is improved, the mixture of the modified wax and the carboxylic acid derivative has wetting characteristics, the compatibility of the hardening filler in the powder coating system can be obviously improved, polyacrylate is used as a surface additive, the leveling property and defoaming effect of the powder coating system are obviously improved, and the carboxylic acid derivative and the polyacrylate are synergized, so that the antistatic property of the prepared powder coating is obviously improved; the carbon nano tube and the carbon black exist in a powder coating system in a mode of a fine particle reinforced phase, so that the powder coating not only can show excellent antistatic effect, but also can play a role of reinforcing a coating, and the powder coating is still excellent in weather resistance after being used for a long time under the interaction of components.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to embodiments thereof. It should be understood that the detailed description and specific examples, while indicating the scope of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In an embodiment of the invention, the antistatic powder coating comprises the following preparation raw materials in percentage by mass:
the sum of the mass percentages of the materials is 100 percent;
the first auxiliary agent is polyacrylate, and the second auxiliary agent is a mixture of modified wax and carboxylic acid derivatives.
In one embodiment, the carboxyl-terminated polyester resin A has an acid value of 19-24mgKOH/g, a viscosity of 3000-3500 mPa.s at 200 ℃ and a TG ≥ 62 ℃.
In one embodiment, the carboxyl-terminated polyester resin B has an acid value of 48-60mgKOH/g, a viscosity of 5000-6000 mPa.s at 200 ℃ and a TG ≥ 70 ℃.
By adding the carboxyl-terminated polyester resin A and the carboxyl-terminated polyester resin B in different proportions, a system with good compatibility is formed, which is beneficial to improving the smoothness and the flatness of the surface of a coating, and has stronger surface toughness and tighter surface bonding, so that good coating characteristics can be obtained. When the acid value of the carboxyl-terminated polyester resin is too low, the reactivity is reduced, the weather resistance is reduced, the crosslinking property of a coating is reduced, when the acid value of the carboxyl-terminated polyester resin is too high, the reaction speed during curing is increased, the appearance performance of the formed coating is also reduced, and the melt dispersibility of the powder coating system is poor.
In one embodiment, the ratio of the modified wax to the carboxylic acid derivative is 10-20:1-5, in mass percent.
In one embodiment, the carboxylic acid derivative is one or more of acetic anhydride, methyl methacrylate, and diethyl malonate.
In one embodiment, the second auxiliary agent is prepared by: according to the mass percentage, the modified wax and the carboxylic acid derivative are placed in a mixing kettle and stirred for 5min to 15min at the stirring speed of 500r/min to 1000r/min, so that the second auxiliary agent with uniform dispersion is obtained. The modified wax and the carboxylic acid derivative are added in a certain proportion, wherein the modified wax exists in a microcrystalline form when being cooled to normal temperature, and the thixotropy of the modified wax is favorable for storing the powder coating; the carboxyl carbon in the carboxylic acid derivative being sp2The three hybrid orbitals are in the same plane and the bond angle is about 120 °, one of which forms a σ bond with the carbonyl oxygen and one with the hydrogen or hydrocarbyl carbon. A p orbit is left on the carboxyl carbon and forms a bond with the p orbit on the carbonyl oxygen through side overlapping, so that the carboxylic acid derivative has a lower conjugation effect when being mixed with the modified wax, and the improvement of the whole compatibility, dispersibility and leveling property of a powder system is facilitated.
In one embodiment, the conductive carbon black has a median average particle diameter of 15nm to 20nm and a specific surface area of 120m2/g-135m2(ii) a resistivity of 0.9 to 1.2. omega. m.
In one embodiment, the dispersant is an acrylic copolymer.
In one embodiment, the dispersant is an acrylic acid-hydroxypropyl acrylate copolymer.
In one embodiment, the carbon nanotubes are formed by rolling graphene sheets.
In one embodiment, the hardening filler is quartz powder, and the median average particle size of the quartz powder is 5 μm to 8 μm.
In one embodiment, the leveling agent is polysiloxane-modified polyether or polyester-modified polyether.
In one embodiment, the brightener is a copolymer of butyl acrylate and methyl methacrylate.
In one embodiment, the pigment is one or more of an organic pigment, an inorganic pigment, a metallic pigment, and pearlescence. More specifically, the pigment is one or more of titanium dioxide, iron oxide red, iron oxide yellow and navy blue.
In one embodiment, there is also provided a method for preparing the antistatic powder coating, the method comprising the steps of:
placing the hardening filler into a mixing kettle, adding a second auxiliary agent, fully and uniformly mixing, placing into a medium water bath kettle at the temperature of 65-85 ℃, vibrating for 8-15 min, extruding under the pressure condition of 45-55 MPa, and finally performing first crushing to obtain a mixture A;
continuously adding carboxyl-terminated polyester resin A, carboxyl-terminated polyester resin B, triglycidyl isocyanurate, a dispersing agent, conductive carbon black, carbon nano tubes, hardening filler, a leveling agent, a first auxiliary agent, a brightening agent, benzoin, polytetrafluoroethylene and pigment into the mixing kettle, and fully and uniformly mixing to obtain a mixture B;
and carrying out melt extrusion treatment, second crushing treatment and grinding treatment on the mixture B to obtain the antistatic powder coating.
In one embodiment, the extrusion process is performed by a tablet press, and the temperature of the extrusion process is controlled to be 30-85 ℃ during the extrusion process.
In one embodiment, the first crushing treatment is: and placing the mixture after extrusion treatment in a crushing tank, wherein a mesh screen with an inclination angle of 45 degrees is arranged in the crushing tank.
In one embodiment, the melt extrusion process is a twin screw melt extrusion process, and the process parameters of the melt extrusion process are as follows: the temperature of the first zone of the melt extrusion treatment is 100-120 ℃; the temperature of the second zone for the melt extrusion treatment is 130-150 ℃; the temperature of the three zones of the melt extrusion treatment is 110-140 ℃; the temperature of the four areas of the melt extrusion treatment is 120-130 ℃; the rotating speed of the host machine for melt extrusion treatment is 1800r/min-3000 r/min.
In one embodiment, the particle size of the antistatic powder coating is 30 μm to 33 μm.
Different resins, additives and processes are combined, so that the compatibility difference and dispersion unevenness among the components are reduced, the surface leveling state of the system is improved, the surface leveling state and physical properties better than those of the traditional antistatic powder coating are obtained, and the antistatic powder coating is better applied to electronic equipment and meets the antistatic requirement.
According to the scheme, after the hardening filler is mixed with the carboxylic acid derivative, the dispersion degree of the hardening filler in a powder coating system is improved, the carboxylic acid derivative can obviously improve the compatibility of the hardening filler in the powder coating system, and the carboxylic acid derivative and the polyacrylate are used as surface additives, so that the leveling property and the defoaming effect of the powder coating system are obviously improved, and the carboxylic acid derivative and the polyacrylate are synergistically enhanced, so that the antistatic performance of the prepared powder coating is obviously improved; the carbon nano tube and the carbon black exist in a powder coating system in a mode of a fine particle reinforced phase, so that the powder coating not only can show excellent antistatic effect, but also can play a role of reinforcing a coating, and the powder coating is still excellent in weather resistance after being used for a long time under the interaction of components.
Embodiments of the present invention will be described in detail below with reference to specific examples.
Embodiments 1 to 5 provide an antistatic powder coating, comprising the following steps:
placing 20g of modified wax and 3g of acetic anhydride in a mixing kettle, and stirring at a stirring speed of 800r/min for 15min to obtain a uniformly dispersed second auxiliary agent;
placing the hardening filler into a mixing kettle, adding the second auxiliary agent, fully and uniformly mixing, placing into a water bath kettle at the temperature of 75 ℃, vibrating for 10min, extruding under the conditions of 50MPa and the temperature of 75 ℃, and finally performing first crushing to obtain a mixture A;
continuously adding carboxyl-terminated polyester resin A, carboxyl-terminated polyester resin B, triglycidyl isocyanurate, a dispersing agent, conductive carbon black, carbon nano tubes, hardening filler, a leveling agent, a first auxiliary agent, a brightening agent, benzoin, polytetrafluoroethylene and pigment into the mixing kettle, and fully and uniformly mixing to obtain a mixture B;
and (2) subjecting the mixture B to melt extrusion treatment, wherein the process parameters of the melt extrusion treatment are as follows: the temperature of a first zone of the melt extrusion treatment is 100 ℃; the temperature of the second zone of the melt extrusion treatment is 150 ℃; the temperature of three zones of the melt extrusion treatment is 110 ℃; the temperature of the four zones of the melt extrusion treatment is 130 ℃; the rotating speed of a main machine for melt extrusion treatment is 1800r/min, and the antistatic powder coating with the particle size of 30 mu m is obtained after the second crushing treatment and the grinding treatment.
Comparative example 1:
the difference from example 5 is that the second auxiliary agent is a single carboxylic acid derivative without adding a modifying wax, and the other ingredients are the same as example 5.
Comparative example 2:
the difference from example 5 is that the carboxylic acid derivative is not added, the second auxiliary agent is a single modified wax, and the other ingredients are the same as example 5.
Comparative example 3:
the difference from the example 5 is that the first auxiliary agent is not added, and other components are the same as the example 5.
Comparative example 4:
the difference from example 5 is that a polyester resin is added instead of the carboxyl-terminated polyester resin A and the carboxyl-terminated polyester resin B, and the other components are the same as in example 5.
Comparative example 5:
the difference from example 5 is that titanium dioxide is added instead of the acrylic acid-hydroxypropyl acrylate copolymer, and other components and amounts are the same as example 5.
The raw material components and the amounts (mass percentages) used in examples 1 to 5 and comparative examples 1 to 5 are shown in tables 1 and 2, respectively.
Table 1:
table 2:
the antistatic powder coatings prepared in examples 1 to 5 and the antistatic powder coatings prepared in comparative examples 1 to 5 were subjected to antistatic performance test with the test standard of SJ/T10694-2006, and the results are shown in Table 3.
Table 3:
from the data analysis of table 3, it can be seen that the single component used as the second aid in the powder system in comparative example 1 and comparative example 2, the antistatic properties of the powder coatings obtained were significantly poorer than those of the powder coatings of examples 1 to 5, comparative example 3 no first auxiliary was added, and in comparative example 4 polyester resin was used instead of carboxyl-terminated polyester resin a and carboxyl-terminated polyester resin B, in comparative example 5, titanium dioxide was added instead of the acrylic acid-hydroxypropyl acrylate copolymer, but the antistatic properties of the powder coatings prepared in comparative examples 3-5 were significantly inferior to those of the powder coatings prepared in examples 1-5 of the present invention, indicating that the components of the powder coatings of the present invention form a complete interaction system in the powder system, contributing to obtaining a powder coating with excellent antistatic properties.
The antistatic powder coatings prepared in examples 1 to 5 and the antistatic powder coatings prepared in comparative examples 1 to 5 were subjected to a gloss retention test for 1000 hours by a xenon lamp according to the method one in the standard GB/T1865 color paint and varnish artificial weathering and artificial radiation exposure filtered xenon arc radiation, and the results are shown in the following Table 4.
Table 4:
as can be seen from the data analysis of Table 4, the antistatic powder coating prepared in the present invention has excellent light-retaining rate of 85% or more, but the antistatic powder coatings of comparative examples 1-5 have significantly poorer light-retaining rate than those of examples 1-5. In addition, the powder coatings prepared in examples 1 to 5 and the powder coatings prepared in comparative examples 1 to 5 were subjected to strength tests and weather resistance tests, and the results showed that the powder coatings of examples 1 to 5 of the present invention had more excellent strength and weather resistance in forming a coating layer than the powder coatings of examples 1 to 5, because the powder coatings prepared in the present invention were more widely used.
Examples 6 to 8:
a method for preparing an antistatic powder coating in embodiments 6 to 8, comprising the steps of:
placing the modified wax and the carboxylic acid derivative in a mixing kettle, and stirring at a stirring speed of 1000r/min for 15min to obtain a uniformly dispersed second auxiliary agent;
placing the hardening filler into a mixing kettle, adding a second auxiliary agent, fully and uniformly mixing, placing into a water bath kettle at the temperature of 65 ℃, vibrating for 15min, extruding under the conditions of 45MPa and the temperature of 85 ℃, and finally performing first crushing to obtain a mixture A;
continuously adding carboxyl-terminated polyester resin A, carboxyl-terminated polyester resin B, triglycidyl isocyanurate, a dispersing agent, conductive carbon black, carbon nano tubes, hardening filler, a leveling agent, a first auxiliary agent, a brightening agent, benzoin, polytetrafluoroethylene and pigment into the mixing kettle, and fully and uniformly mixing to obtain a mixture B;
and (2) subjecting the mixture B to melt extrusion treatment, wherein the process parameters of the melt extrusion treatment are as follows: the temperature of the first zone of the melt extrusion treatment is 120 ℃; the temperature of the second zone of the melt extrusion treatment is 130 ℃; the temperature of three zones of the melt extrusion treatment is 140 ℃; the temperature of the four zones of the melt extrusion treatment is 130 ℃; the rotating speed of a main machine for melt extrusion treatment is 1800r/min, and the antistatic powder coating with the particle size of 33 mu m is obtained after the second crushing treatment and the grinding treatment.
It should be noted that: the ingredients and amounts in examples 6-8 were the same as in example 5, but the ratio of modified wax to acetic anhydride was different.
Comparative examples 6 to 8:
comparative examples 6 to 8 were conducted in a different ratio of the modified wax to the carboxylic acid derivative from example 8, and the other components, contents and preparation process were the same as in comparative example 8.
The addition ratios (mass percentages) of the modified waxes and the carboxylic acid derivatives in examples 6 to 8 and comparative examples 6 to 8 are shown in table 5 below.
Table 5:
| example 6 | Example 7 | Example 8 | Comparative example 6 | Comparative example 7 | Comparative example 8 | |
| Modified wax | 10 | 20 | 15 | 6 | 25 | 15 |
| Acetic anhydride | 1 | 5 | 3 | 1 | 7 | 11 |
The antistatic powder coatings prepared in examples 6 to 8 and the antistatic powder coatings prepared in comparative examples 6 to 8 were subjected to antistatic performance test with the test standard of SJ/T10694-2006, and the results are shown in Table 6.
Table 6:
as can be seen from the data analysis in table 6, the addition ratio of the modified wax and the carboxylic acid derivative in the present invention affects the antistatic performance of the prepared powder coating, and the present invention limits the addition ratio of the modified wax and the carboxylic acid derivative, thereby not only promoting the compatibility of the whole powder system, but also affecting the antistatic performance of the prepared powder coating.
Examples 9 to 11:
placing 20g of modified wax and 3g of acetic anhydride in a mixing kettle, and stirring at a stirring speed of 800r/min for 15min to obtain a uniformly dispersed second auxiliary agent;
placing the hardening filler into a mixing kettle, adding a second auxiliary agent, fully and uniformly mixing, placing into a water bath kettle at the temperature of 75 ℃, vibrating for 10min, extruding under the conditions of 50MPa and the temperature of 75 ℃, and finally performing first crushing to obtain a mixture A;
continuously adding carboxyl-terminated polyester resin A, carboxyl-terminated polyester resin B, triglycidyl isocyanurate, a dispersing agent, conductive carbon black, carbon nano tubes, hardening filler, a leveling agent, a first auxiliary agent, a brightening agent, benzoin, polytetrafluoroethylene and pigment into the mixing kettle, and fully and uniformly mixing to obtain a mixture B;
and performing melt extrusion treatment on the mixture B, wherein the rotating speed of a main machine of the melt extrusion treatment is 1800-3000 r/min, and performing secondary crushing treatment and grinding treatment to obtain the antistatic powder coating with the particle size of 20 mu m.
The ingredients and amounts used in examples 9 to 11 were the same as in example 5, but the specific conditions for the melt extrusion treatment were different.
Comparative examples 9 to 11:
the melt extrusion processing conditions in comparative examples 9 to 11 were different from those in example 11, and the other examples were the same as those in example 11.
The melt extrusion processing conditions for examples 9-11 and comparative examples 9-11 are shown in Table 7 below.
Table 7:
the antistatic powder coatings prepared in examples 9 to 11 and the antistatic powder coatings prepared in comparative examples 9 to 11 were subjected to antistatic performance test with the test standard of SJT 10694-.
Table 8:
from the data analysis in table 8, it can be seen that the melt extrusion processing conditions of the present invention also affect the antistatic performance of the prepared powder coating, and the powder coating of the present invention can obtain better antistatic performance under the synergistic effect of the components, the content of the components and the process conditions. In addition, the powder coating prepared in comparative example 10 shows a significant decrease in the gloss of the product surface and poor mechanical properties such as impact and adhesion during melt extrusion due to an excessively high extrusion temperature. Therefore, under the action of the melt extrusion processing parameters, the powder coating with better antistatic effect can be obtained.
Comparative example 12:
the difference from example 5 is that no carbon nanotubes were added, and the other examples were the same as example 5.
Comparative example 13:
the difference from example 5 is that carbon black is added, and the other steps are the same as example 5.
The powder coatings of comparative example 12 and comparative example 13 were subjected to a gloss retention test using a xenon lamp for 1000h, as described in the method one of the GB/T1865-2009 paint and varnish Artificial weathering and Artificial radiation Exposure filtered xenon arc radiation standards, with the results shown in Table 9 below.
Table 9:
from the data analysis in table 9, it can be seen that the addition of carbon nanotubes and carbon black in the present invention can ensure the excellent antistatic performance of the prepared powder coating, and also can contribute to the enhancement of the weatherability of the coating formed by the powder coating.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The antistatic powder coating is characterized by comprising the following preparation raw materials in percentage by mass:
the sum of the mass percentages of the materials is 100 percent;
the first auxiliary agent is polyacrylate, and the second auxiliary agent is a mixture of modified wax and carboxylic acid derivatives.
2. The antistatic powder coating as claimed in claim 1, wherein the carboxyl-terminated polyester resin A has an acid value of 19 to 24mgKOH/g, a viscosity of 3000-3500 mPa-s at 200 ℃ and a TG of 62 ℃ or more.
3. The antistatic powder coating as claimed in claim 1, wherein the carboxyl-terminated polyester resin B has an acid value of 48 to 60mgKOH/g, a viscosity of 5000-6000 mPas at 200 ℃ and a TG of 70 ℃ or more.
4. The antistatic powder coating according to claim 1, wherein the conductive carbon black has a median average particle diameter of 15nm to 20nm and a specific surface area of 120m2/g-135m2(ii) a resistivity of 0.9 to 1.2. omega. m.
5. The antistatic powder coating of claim 1 wherein the hardening filler is quartz powder, and the mean average particle size of the quartz powder is 5 μm to 8 μm.
6. The antistatic powder coating of claim 1 wherein the leveling agent is a polysiloxane-modified polyether or a polyester-modified polyether.
7. A process for preparing the antistatic powder coating according to any one of claims 1 to 6, comprising the steps of:
placing the hardening filler into a mixing kettle, adding a second auxiliary agent, fully and uniformly mixing, placing into a medium water bath kettle at the temperature of 65-85 ℃, vibrating for 8-15 min, extruding under the pressure condition of 45-55 MPa, and finally performing first crushing to obtain a mixture A;
continuously adding carboxyl-terminated polyester resin A, carboxyl-terminated polyester resin B, triglycidyl isocyanurate, a dispersing agent, conductive carbon black, carbon nano tubes, hardening filler, a leveling agent, a first auxiliary agent, a brightening agent, benzoin, polytetrafluoroethylene and pigment into the mixing kettle, and fully and uniformly mixing to obtain a mixture B;
and carrying out melt extrusion treatment, second crushing treatment and grinding treatment on the mixture B to obtain the antistatic powder coating.
8. The method of preparing an antistatic powder coating material as claimed in claim 7, wherein the extrusion process is performed by a tablet press, and the temperature of the extrusion process is controlled to be 30-80 ℃ during the extrusion process.
9. The method for preparing an antistatic powder coating according to claim 7, wherein the first crushing treatment is: and placing the mixture after extrusion treatment in a crushing tank, wherein a mesh screen with an inclination angle of 45 degrees is arranged in the crushing tank.
10. The method for preparing the antistatic powder coating according to claim 7, wherein the melt extrusion process is a twin-screw melt extrusion process, and the process parameters of the melt extrusion process are as follows: the temperature of the first zone of the melt extrusion treatment is 100-120 ℃; the temperature of the second zone of the melt extrusion treatment is 130-150 ℃; the temperature of the three zones of the melt extrusion treatment is 110-140 ℃; the temperature of the four areas of the melt extrusion treatment is 120-130 ℃; the rotating speed of the host machine for melt extrusion treatment is 1800r/min-3000 r/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110654555.8A CN113321962B (en) | 2021-06-11 | 2021-06-11 | Antistatic powder coating and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110654555.8A CN113321962B (en) | 2021-06-11 | 2021-06-11 | Antistatic powder coating and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113321962A true CN113321962A (en) | 2021-08-31 |
| CN113321962B CN113321962B (en) | 2022-06-17 |
Family
ID=77421218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110654555.8A Active CN113321962B (en) | 2021-06-11 | 2021-06-11 | Antistatic powder coating and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113321962B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114316756A (en) * | 2021-12-31 | 2022-04-12 | 广东华江粉末科技有限公司 | Thermochromic powder coating and preparation method thereof |
| CN115975425A (en) * | 2022-12-30 | 2023-04-18 | 大钣科技(长兴)有限公司 | Light-colored conductive powder coating capable of being recoated and preparation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9206320B1 (en) * | 2013-07-18 | 2015-12-08 | Hentzen Coatings, Inc. | Matte-appearance powder coating compositions with chemical agent resistance |
| CN106634263A (en) * | 2016-11-22 | 2017-05-10 | 天长市金陵电子有限责任公司 | Thermosetting type static spraying powder coating and a preparing method thereof |
| CN109233405A (en) * | 2018-09-17 | 2019-01-18 | 常州市源长新材料科技有限公司 | A kind of antistatic powder coating and preparation method thereof |
| CN112341912A (en) * | 2020-10-20 | 2021-02-09 | 擎天材料科技有限公司 | Powder coating and preparation method and application thereof |
| CN112778882A (en) * | 2020-12-25 | 2021-05-11 | 上海邦中新材料有限公司 | Antistatic polyester powder coating and preparation method thereof |
-
2021
- 2021-06-11 CN CN202110654555.8A patent/CN113321962B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9206320B1 (en) * | 2013-07-18 | 2015-12-08 | Hentzen Coatings, Inc. | Matte-appearance powder coating compositions with chemical agent resistance |
| CN106634263A (en) * | 2016-11-22 | 2017-05-10 | 天长市金陵电子有限责任公司 | Thermosetting type static spraying powder coating and a preparing method thereof |
| CN109233405A (en) * | 2018-09-17 | 2019-01-18 | 常州市源长新材料科技有限公司 | A kind of antistatic powder coating and preparation method thereof |
| CN112341912A (en) * | 2020-10-20 | 2021-02-09 | 擎天材料科技有限公司 | Powder coating and preparation method and application thereof |
| CN112778882A (en) * | 2020-12-25 | 2021-05-11 | 上海邦中新材料有限公司 | Antistatic polyester powder coating and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114316756A (en) * | 2021-12-31 | 2022-04-12 | 广东华江粉末科技有限公司 | Thermochromic powder coating and preparation method thereof |
| CN115975425A (en) * | 2022-12-30 | 2023-04-18 | 大钣科技(长兴)有限公司 | Light-colored conductive powder coating capable of being recoated and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113321962B (en) | 2022-06-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113321962B (en) | Antistatic powder coating and preparation method thereof | |
| CN106280698B (en) | High-temperature-resistant PI white label ink and preparation method thereof | |
| CN110079130B (en) | Modified red mud for coating and preparation method thereof | |
| WO2021103989A1 (en) | Powder coating having ultrahigh weather-proof and matt effects | |
| CN111393961A (en) | Thermosetting thermoplastic amphoteric powder coating and preparation method thereof | |
| CN108192433B (en) | Modified fluorocarbon powder coating for aluminum surface and preparation method thereof | |
| CN112724805B (en) | Anti-slip powder coating and preparation method thereof | |
| CN115558384B (en) | Low-temperature-cured high-corner-coverage powder coating and preparation method thereof | |
| CN110885458B (en) | Polymer wax powder with self-repairing function and preparation method thereof | |
| EP3845618A1 (en) | Powder coating used for household appliance coiled material and preparation method therefor | |
| CN111057434A (en) | Super weather-resistant finishing powder coating and preparation method thereof | |
| CN106566292B (en) | The preparation method of high dispersive graphene microchip and its application in anti-static and anti-corrosive paint | |
| CN102485816A (en) | Novel thermoplastic powder coating | |
| CN112029081B (en) | Low-temperature curing type metal powder coating, preparation method and polyester resin used in low-temperature curing type metal powder coating | |
| CN112724801A (en) | Matte powder coating for wheel hub and preparation method thereof | |
| CN108822702A (en) | A kind of super thick-slurry type quick drying paint and preparation method thereof for vehicle arrangement | |
| CN112724798B (en) | Powder coating with metal effect and preparation method thereof | |
| CN114350238A (en) | Conductive lubricating anticorrosive paint and preparation method thereof | |
| CN110256875B (en) | Composite modifier capable of improving oxygen index and application method of composite modifier in preparation of modified red mud for coating | |
| CN112457748B (en) | High-toughness low-temperature-resistant powder coating and preparation method thereof | |
| CN110194928B (en) | Preparation method of outdoor powder coating capable of effectively reducing cost | |
| US11203686B2 (en) | Polymer wax powder having a self-repairing function and preparation method thereof | |
| CN112194963A (en) | Thermosetting powder coating and processing technology thereof | |
| CN114085363B (en) | Polyester resin for high-filling powder coating, preparation method of polyester resin and high-filling powder coating | |
| CN113462263A (en) | Ultrahigh-hardness ceramic powder coating and production process thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |