CN110885598B - Application of acrylic acid transparent powder with anti-indentation effect - Google Patents
Application of acrylic acid transparent powder with anti-indentation effect Download PDFInfo
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- CN110885598B CN110885598B CN201911179308.6A CN201911179308A CN110885598B CN 110885598 B CN110885598 B CN 110885598B CN 201911179308 A CN201911179308 A CN 201911179308A CN 110885598 B CN110885598 B CN 110885598B
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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
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
- C09D133/04—Homopolymers or copolymers of esters
- C09D133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09D133/062—Copolymers with monomers not covered by C09D133/06
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
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- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
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- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/06—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
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- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
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- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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Abstract
The invention discloses an application of acrylic acid transparent powder with an anti-indentation effect, which comprises 70-90% of GMA acrylic resin and 8-28% of curing agent in parts by weight, wherein the melt index range of the GMA acrylic resin at 125 ℃ is not lower than 35g/10min, and/or the viscosity range of the GMA acrylic resin at 150 ℃ is not higher than 80Pa.s, the epoxy equivalent range of the GMA acrylic resin is not higher than 700g/eq, and the Tg range of the acrylic acid transparent powder after spraying, curing and film forming is not lower than 62 ℃; according to the invention, through screening the formula raw materials, the indentation resistance of the acrylic transparent powder after curing and film forming is obviously improved, and the indentation problem generated in the packaging and transporting process can be effectively avoided or obviously reduced after the acrylic transparent powder is applied to spraying and film forming of a hub product.
Description
Technical Field
The invention belongs to the field of thermosetting powder coatings, and particularly relates to application of acrylic transparent powder with an anti-indentation effect.
Background
In recent years, governments and society pay more and more attention to the problems of environment, safety, energy and the like, and the development of environment-friendly automobile coatings and the advocation of clean production of automobile coating processes are important concerns of automobile coating production and coating enterprises for matching with energy conservation and emission reduction of automobile industry. With China becoming the largest automobile aluminum hub producing country in the world, the production capacity of the hub covered with acrylic transparent powder is huge, the storage base capacity is larger and larger, the transportation path, especially the sea transportation path is very long, during the storage and transportation processes, the edge of the hub is often provided with the indentation, and the indentation can be removed through the polishing process, but also causes certain loss to an OEM manufacturer, and delays the delivery period of the hub.
Therefore, automobile aluminum wheel hub manufacturers hope that powder coating manufacturers analyze from the source of indentation generation and improve the problem, and reduce the burden of the wheel hub manufacturers on adopting polishing process to process indentations. However, the prior powder coating industry has no prior research case and reference technology for the indentation problem, and in order to solve the problem generated when the specific hub is applied, the applicant particularly sets up a research and development subject for researching the acrylic transparent powder with the indentation resisting effect.
Disclosure of Invention
In view of the above, the invention aims to provide acrylic acid transparent powder with an anti-indentation effect and application thereof, wherein the anti-indentation capability of the acrylic acid transparent powder after curing and film forming is remarkably improved by screening formula raw materials, and the indentation problem generated in the packaging and transportation process of the acrylic acid transparent powder can be effectively avoided or remarkably reduced after the acrylic acid transparent powder is applied to spraying and film forming of a hub product.
The technical scheme adopted by the invention is as follows:
the raw materials of the acrylic acid transparent powder with the anti-indentation effect comprise 70-90% of GMA acrylic resin and 8-28% of curing agent, wherein the melt index range of the GMA acrylic resin at 125 ℃ is not lower than 35g/10min, and/or the viscosity range of the GMA acrylic resin at 150 ℃ is not higher than 80Pa.s, the epoxy equivalent range of the GMA acrylic resin is not higher than 700g/eq, and the Tg range of the acrylic acid transparent powder after being sprayed, cured and formed into a film is not lower than 62 ℃.
Preferably, the melt index of the GMA acrylic resin at 125 ℃ is in the range of 40-70g/10min, and/or the viscosity of the GMA acrylic resin at 150 ℃ is in the range of 15-50Pa.s, and the epoxy equivalent of the GMA acrylic resin is in the range of 400-600 g/eq.
Preferably, the curing agent is a dodecyl diacid or a dodecyl diacid.
Preferably, the Tg range of the acrylic transparent powder after being sprayed and cured into a film is 63-68 ℃.
Preferably, the curing temperature of the acrylic transparent powder is 175-180 ℃, and the curing time is 20-25 minutes.
Preferably, the auxiliary agent comprises one or a mixture of several of ultraviolet absorber and light stabilizer.
In order to realize the coating of the automatic production line, the applicant pays attention to that automobile hub manufacturers generally carry out rapid transportation and packaging on the premise of ensuring the temperature safety after acrylic transparent powder is heated and cured into a transparent coating film on a spraying production line, however, the applicant finds that the problem is also another factor causing indentation, preferably, the application of the acrylic transparent powder is to spray the acrylic transparent powder on a workpiece to be sprayed and then heat and cure into the transparent coating film, wherein the workpiece which is heated and cured is cooled, the temperature range of the cooling is 15-40 ℃, and the cooling time is not less than 30 minutes.
Preferably, the cooling mode comprises the step of placing the workpiece which is subjected to heating solidification in a cooling environment chamber, and the cooling environment chamber adopts electric control cooling or natural cooling.
Preferably, the workpiece comprises a hub, and the transparent coating film is used as a glazing surface of the hub, generally an automobile hub.
Preferably, the hub after finishing coating is protected by a packing material, and the packing material does not contain a plasticizing material.
Preferably, the packing material is made of foamed cotton.
The melt index test standard of the invention is ASTM D1238-57T, and the detection instrument adopts a melt index meter; the testing standard of the viscosity is GB/T22314-; the test standard of the epoxy equivalent is GB/T4612-2008; the standard for testing melting point is according to ASTM D2117.
In the process of developing the acrylic transparent powder with the anti-indentation effect, the applicant finds that the indentation problems fed back by automobile hub manufacturers are all discovered after the automobile hub manufacturers finish transporting and packaging the acrylic transparent powder to downstream manufacturers, while powder coating manufacturers need to solve the indentation problems generated by the acrylic transparent powder, a large amount of simulation tests on the anti-indentation effect of the acrylic transparent powder after spraying, curing and film forming are needed, the automobile hubs are heavy, large in size, high in cost and complex in transportation process, and obviously, the powder coating products in the research and development process are infeasible to be directly detected according to actual conditions, however, the existing detection projects aiming at the powder coating curing and film coating are all for detecting the adhesive force (including grid drawing, a shaft rod bending method and impact resistance) and weather resistance of the film, and the detection projects cannot evaluate the anti-indentation performance of the; the indentation instrument applied to the field of liquid paint film coating adopts a single indentation head to detect the film coating, and adopts a point-pressing contact mode, so that after trial, the applicant finds that the indentation instrument cannot be used for evaluating the indentation resistance effect of the transparent acrylic powder, the detection efficiency is low, and the detection cost is high.
Therefore, preferably, the invention also provides a rapid detection method for the anti-indentation performance of the coating film, which adopts a contact laminated plate to carry out press contact on the coating film of the substrate to be detected placed on the detection operation platform, and is used for forming a press contact substrate coating film area of the coating film of the substrate to be detected, wherein the area of the press contact substrate coating film area is smaller than that of the coating film of the substrate to be detected; the gravity source is contacted with the upper part of the contact laminated plate through a transition lamination flat plate, the area of the transition lamination flat plate is larger than that of the lamination contact substrate coating area, and the gravity source is used for adjusting the uniform distribution of pressure applied to the lamination contact substrate coating area by the gravity source; and observing whether the film coating area of the press-fit contact substrate generates indentation marks relative to the film coating area of the non-press-fit contact substrate or not after the gravity source applies pressure to the film coating area of the press-fit contact substrate for a target time.
Preferably, the area of the coating area of the press-fit contact substrate is not more than 70% of the area of the coating area of the substrate to be detected, and the area of the transition press-fit flat plate is not less than 150% of the area of the coating area of the press-fit contact substrate.
Preferably, the gravity source is located in a gravity center area of the transition press flat plate.
Preferably, the gravity source is a weight.
Preferably, the coating film of the substrate to be detected is subjected to press contact by adopting a first contact pressing plate and a second contact pressing plate which are distributed at intervals and used for forming a first press contact substrate coating film area and a second press contact substrate coating film area of the coating film of the substrate to be detected, and the sum of the areas of the first press contact substrate coating film area and the second press contact substrate coating film area is smaller than the area of the coating film of the substrate to be detected; the gravity source is simultaneously contacted with the upper part of the first contact laminated board and the upper part of the second contact laminated board through a transition lamination flat board, and the area of the transition lamination flat board is larger than the sum of the areas of the first lamination contact substrate coating area and the second lamination contact substrate coating area.
Preferably, the area of the first press contact substrate coating film area and the area of the second press contact substrate coating film area are equal.
Preferably, the substrate to be detected is coated with a packing material, and the contact laminated plate is in direct press contact with the packing material.
Preferably, the packaging material is selected from thermoplastic films, non-woven fabrics or foamed cotton which do not contain a plasticizer.
Preferably, the substrate coating to be detected is detected in a temperature adjusting chamber, and the detection temperature ranges from 30 ℃ to 80 ℃.
Preferably, the pressure applied to the coating film area of the press contact substrate is in the range of 500-5000Pa, and the target time for applying the pressure is not less than 30 minutes.
Preferably, the base material coating film to be detected is obtained by spraying and curing powder coating on a metal substrate.
Preferably, the rapid detection device applied to the rapid detection method for the indentation resistance of the coating film comprises a contact laminated plate and a gravity source, wherein the contact laminated plate is in contact with the coating film of the substrate to be detected, and a transition laminated plate is arranged between the contact laminated plate and the gravity source; the area of the substrate coating film to be detected is larger than the area of a substrate coating film pressing contact area between the laminated board and the substrate coating film to be detected, and the area of the transition pressing flat board is larger than the area of the substrate coating film pressing contact area.
Preferably, the rapid detection device comprises a first contact pressing plate and a second contact pressing plate which are distributed at intervals, and the transition pressing plate is simultaneously contacted with the upper part of the first contact pressing plate and the upper part of the second contact pressing plate; the sum of the areas of the first press-fit contact substrate coating area and the second press-fit contact substrate coating area is smaller than the area of the substrate coating to be detected, and the area of the transition press-fit flat plate is larger than the sum of the areas of the first press-fit contact substrate coating area and the second press-fit contact substrate coating area.
Preferably, the distance between the first contact laminate plate and the second contact laminate plate ranges from 1 to 5 cm.
Preferably, the gravity source is a weight.
Preferably, the transition pressing flat plate is a glass plate.
Preferably, the weight of the gravity source is in the range of 500g-5 Kg.
Preferably, the coating film area of the press contact substrate is in a rectangular shape.
The acrylic transparent powder provided by the invention has the anti-indentation effect, namely, after the acrylic transparent powder is sprayed on a workpiece and is heated and cured into a transparent coating, the indentation problem can not occur after the acrylic transparent powder is transported for a long time, or at least the indentation problem is obviously improved compared with the existing acrylic transparent powder.
After a large number of screening tests, the invention surprisingly discovers that the specific screening selection is carried out on the related parameter range of GMA acrylic resin, so that the Tg of the transparent coating after spraying and curing is at least not lower than 62 ℃ (once the Tg of the coating is lower than 62 ℃, the indentation resistance is obviously reduced), the transparent coating has obviously more excellent indentation resistance compared with the conventional acrylic transparent powder in the prior art, and the problem of indentation generated in the process of packaging and transporting the hub product can be effectively avoided or obviously reduced after the acrylic transparent powder provided by the invention is applied to the spraying and film forming of the hub product.
The invention also provides a method for further cooling the transparent coating film after the spraying and curing of the production line are finished, the cooling temperature range is 15-40 ℃, the cooling time is not less than 30 minutes, and a large number of tracking tests show that the pressure mark resistance of the coating film can be further obviously reduced through the cooling step under the specific condition.
The invention also aims at a rapid detection method for the anti-indentation performance of the coating, a contact laminated plate and a substrate to be detected are coated to form a laminated contact substrate coating area, then a transitional lamination flat plate is used for uniformly and evenly transmitting the pressure of a gravity source to the laminated contact substrate coating area, and meanwhile, the areas of the contact laminated plate and the transitional lamination flat plate are reasonably configured, so that the rapid detection of the anti-indentation effect of the coating can be realized; in order to further facilitate observation and comparison of indentation marks of a coating film and further ensure uniform pressure transmission from a pressure source to a coating film area of a pressing contact substrate, and the contact pressing plate contacted with the coating film of the substrate to be detected does not tilt, the invention further provides a structural design of adopting first contact pressing plates and second contact pressing plates which are distributed at intervals and a transition pressing flat plate which is contacted with the upper part of the first contact pressing plate and the upper part of the second contact pressing plate at the same time, which is favorable for rapid and direct observation and comparison, and simultaneously the first contact pressing plates and the second contact pressing plates which are distributed at intervals are simultaneously used as supporting base surfaces of the transition pressing flat plate, so that the flatness and the stress uniformity of different pressing plates are ensured, and the detection accuracy and the detection efficiency of the anti-indentation performance of the coating film are ensured.
Drawings
FIG. 1 is a schematic structural diagram of a rapid detection device for indentation resistance of a coating film in example 1 of the present invention;
FIG. 2 is a block diagram showing the steps of the method for rapidly detecting the indentation resistance of a coating film in example 1 of the present invention;
FIG. 3 is a schematic structural diagram of a rapid detection device for indentation resistance of a coating film in example 2 of the present invention;
FIG. 4 is a photograph comparison of step B30) of example 2 of the present invention;
FIG. 5 is a photograph comparison of comparative example 3, step B30), according to the invention.
Detailed Description
The present embodiment provides an acrylic transparent powder with anti-indentation effect, and the formula raw materials of the acrylic transparent powder are shown in table 1 below:
table 1 raw material formulation of the examples of the present application
| Raw materials | Parts by weight |
| GMA acrylic resin | 70 to 90 portions of |
| Curing agent | 8-28 parts of |
| Leveling agent | 0 to 1 portion of |
| Degassing agent | 0 to 1 portion of |
| Ultraviolet absorber | 0 to 1 portion of |
| Light stabilizers | 0 to 1 portion of |
Wherein the melt index range of GMA acrylic resin at 125 ℃ is not lower than 35g/10min, and/or the viscosity range of GMA acrylic resin at 150 ℃ is not higher than 80Pa.s, the epoxy equivalent range of GMA acrylic resin is not higher than 700g/eq, and the Tg range of acrylic transparent powder after spraying, curing and film forming is not lower than 62 ℃; further preferably, in the present embodiment, the melt index of the GMA acrylic resin at 125 ℃ is in the range of 40-70g/10min, and/or the viscosity of the GMA acrylic resin at 150 ℃ is in the range of 15-50Pa.s, and the epoxy equivalent of the GMA acrylic resin is in the range of 400-; the curing agent adopts dodecyl diacid or dodecyl diacid; more preferably, in the present embodiment, the Tg range of the acrylic transparent powder after spray curing to a film is 63 to 68 ℃.
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1: the formula raw materials of the acrylic acid transparent powder with the anti-indentation effect are shown in the following table 2:
table 2 example 1 raw materials table of formulation
In this example 1, it was determined that the A254 GMA acrylic resin provided by DIC had a melt index in the range of 46 to 54g/10min at 125 ℃ (ASTM-D1238-57T), a viscosity in the range of 20 to 40Pa.s at 150 ℃, a Tg in the range of 45 to 51 ℃, and an epoxy equivalent in the range of 480-520 g/eq; the melting point of the decaalkyl diacid is 130-133 ℃ for
In other embodiments, the epoxy equivalent of the GMA acrylic resin is in the range of 400-600g/eq, GMA acrylic resins outside this range exhibit significantly poorer performance in achieving the target Tg range of the coating film, and the anti-rutting effect is significantly worse as soon as the coating film is below 62 ℃.
The embodiment specifically proposes that the acrylic acid transparent powder provided by the embodiment is applied, the acrylic acid transparent powder is sprayed on a workpiece to be sprayed and then is heated and cured into a transparent coating film, the curing temperature range is 175-; wherein, the workpiece which is heated and solidified is placed in a cooling environment chamber, the workpiece which is heated and solidified is cooled, the cooling temperature range is 15-40 ℃, the cooling time is not less than 30 minutes, and the cooling environment chamber adopts electric control cooling or natural cooling;
preferably, in the embodiment, the workpiece is an automobile hub, the transparent coating film is used as a finishing surface of the automobile hub, and the coated automobile hub is protected by a packaging material which does not contain a plasticizing material; the packing material can be selected from thermoplastic film, non-woven fabric or foamed cotton; specifically, in the embodiment 1, when the automobile hub is subsequently applied to the automobile hub, the foam cotton is used as the packing material;
further preferably, the automobile hub after being heated and solidified is cooled, the cooling temperature is set at 25 ℃, the cooling time is 60 minutes, the cooling environment chamber adopts electric control cooling, and naturally the automobile hub can be placed outdoors for ventilation and natural cooling, and the cooling time is not less than 30 minutes; after cooling, adopting a packing material to protect the coated automobile hub;
referring to fig. 1, in order to rapidly detect the anti-indentation performance of the coating film of the acrylic transparent powder provided by the present invention, the present embodiment further provides a device for rapidly detecting the anti-indentation performance of the coating film, wherein the base material coating film 12 to be detected is a transparent coating film obtained by spraying a cured powder coating on an aluminum substrate 11 (in other embodiments, an iron substrate may also be used); the coating film of the base material to be detected is coated with the packaging material, the embodiment most preferably adopts the foam cotton 13, in other embodiments, the packaging material can also adopt a thermoplastic film or non-woven fabric which does not contain a plasticizer, and the coating film 12 of the base material to be detected which is coated by the foam cotton 13 in the embodiment can better simulate the indentation generation environment of the hub;
in this embodiment, the rapid detection device includes a contact pressure plate 110 in contact with the foam cotton 13, and a weight 130 as a gravity source (in other embodiments, other objects with a fixed total amount may be used as the gravity source, which is not particularly limited in this embodiment), a transition pressure plate 120 is disposed between the contact pressure plate 110 and the weight 130, and the transition pressure plate 120 is a glass plate; wherein, the area of the substrate coating film 12 to be detected is larger than the area of the substrate coating film pressed and contacted area between the pressed laminated plate 110 and the substrate coating film 12 to be detected, and the area of the transitional pressing flat plate 120 is larger than the area of the substrate coating film pressed and contacted area; preferably, the area of the coating area of the press-fit contact substrate is not more than 70% of the area of the coating area of the substrate to be detected, and the area of the transition press-fit flat plate is not less than 150% of the area of the coating area of the press-fit contact substrate; the pressure applied to the region where the substrate coating film is in press contact with the pressing surface is in the range of 500-5000Pa, the target time for applying the pressure is not less than 30 minutes, preferably, the target time for applying the pressure is set to be more than 1 hour, the specific parameter selection can be specifically set based on the actual indentation resistance requirement, and the higher the pressure is, the longer the target time for applying the pressure is, the higher the indentation resistance requirement of the substrate coating film 12 to be detected is represented;
specifically, in the present embodiment, the substrate coating film 12 to be detected is a transparent coating film obtained by spraying and curing a powder coating on the aluminum substrate 11 of a5 standard, the contact laminated plate 110 is an aluminum contact laminated plate with a length of 12cm and a width of 3cm, the glass plate as the intermediate laminated plate 120 is generally of a5 standard, and the weight 130 is 2 kg;
referring to fig. 2, in this embodiment, the above-mentioned rapid detection apparatus is used for rapid detection of the anti-indentation performance of the coating film, and the detection method is as follows:
A10) placing the base material coating film 12 to be detected coated with the foamed cotton 13 on a detection operation table (not shown in the figure), placing the detection operation table in a temperature adjusting chamber (not shown in the figure, and specifically adopting a temperature box), wherein the temperature adjusting range is 30-80 ℃;
A20) placing the contact laminated plate 110 on the foam cotton 13 for forming a pressed contact substrate coating film area of the substrate coating film 12 to be detected; then, the transition pressing flat plate 120 and the weight 130 are sequentially placed on the contact pressing plate 110, and the weight 130 is located in the gravity center area of the transition pressing flat plate 120;
A30) after the temperature of the temperature adjustment chamber was set at 50 ℃, the weight 130, the transition press plate 120, the contact press plate 110 and the foam 13 were removed after the time reached 60 minutes, and it was observed that no impression mark was generated in the press-contact substrate coating area on the aluminum substrate 11 relative to the non-press-contact substrate coating area, as shown in fig. 4.
After the acrylic transparent powder coating of the embodiment 1 is provided to a hub manufacturer for package and transportation verification, the generation of indentation marks is also fed back.
Example 2: the rest of the technical solution of this embodiment 2 is the same as that of embodiment 1, except that, in this embodiment 2, please refer to fig. 3, the rapid detection device includes a first contact pressing plate 110a and a second contact pressing plate 110b which are distributed at intervals, the first contact pressing plate 110a and the second contact pressing plate 110b both use aluminum contact pressing plates with a length of 12cm and a width of 3cm, preferably, the distance between the first contact pressing plate 110a and the second contact pressing plate 110b is in a range of 1-5 cm; specifically, in the present embodiment, the distance D between the first contact laminated plate 110a and the second contact laminated plate 110b is 2 cm;
in this embodiment, the rapid detection device is used for rapid detection of the indentation resistance of the coating film, and the detection method is as follows:
B10) placing the base material to be detected coated film 12 coated with the foamed cotton 13 on a detection operation table, and placing the detection operation table in a temperature adjusting chamber, wherein the temperature adjusting range is 30-80 ℃;
B20) placing the first contact laminated plate 110a and the second contact laminated plate 110b which are distributed at intervals on the foamed cotton for forming a pressed contact substrate coating film area of the substrate coating film 12 to be detected; then, placing the transition pressing flat plate 120 and the weight 130 on the contact pressing plate in sequence, wherein the weight 130 is positioned in the gravity center area of the transition pressing flat plate 120;
B30) after the temperature of the temperature adjusting chamber is set at 50 ℃, the time is counted, and after the time reaches 60 minutes, the weight 130, the transition press-fit flat plate 120, the first contact press-fit plate 110a, the second contact press-fit plate 110b and the foam cotton 13 are respectively removed, as shown in fig. 4, wherein a) is a shot picture of the base material coating film 12 to be detected before detection, b) is a shot picture of the base material coating film 12 in the step, and it is observed that no indentation mark is generated in the press-fit contact base material coating film area on the aluminum substrate 11 relative to the non-press-fit contact base material coating film area.
After the acrylic transparent powder coating of the embodiment 2 is provided for a hub manufacturer for packaging and transportation verification, no indentation mark is generated in feedback.
Example 3: the rest of the technical scheme of the embodiment 3 is the same as that of the embodiment 1, except that GMA acrylic resin provided by Anderson (epoxy equivalent of 400-450g/eq, and melt index at 150 ℃ in the range of 46-54g/10min) is adopted to replace the GMA acrylic resin in the embodiment 1 in the embodiment 3; no indentation marks were detected.
Example 4: the rest technical solutions of this example 4 are the same as those of example 1, except that the formula raw materials of this example 4 are shown in table 3 below:
table 3 example 4 raw materials table of the formulations
Example 5: the rest technical scheme of this example 5 is the same as that of example 1, except that the formula raw materials of this example 5 are shown in table 4 below:
table 4 example 5 raw materials table of the formulations
Example 6: the rest technical solutions of this example 6 are the same as those of example 1, except that the formula raw materials of this example 6 are shown in table 5 below:
table 5 example 6 raw materials table of the formulations
Example 7: the rest technical solutions of this example 7 are the same as those of example 1, except that the following formula materials of this example 7 are shown in table 6:
table 6 example 7 raw materials table of the formulations
Example 8: the rest of the technical solution of this example 8 is the same as that of example 1, except that in this example 8, the temperature of the temperature adjustment chamber was set at 30 ℃ or 35 ℃ or 40 ℃ or 45 ℃ in step a30), and then the weight, the glass plate, the contact laminated plate, and the foam were removed after 80 minutes, and it was observed that no impression mark was generated in the area of the coating film of the press-contact substrate on the aluminum substrate with respect to the area of the coating film of the non-press-contact substrate.
Example 9: the rest of the technical solution of this example 9 is the same as that of example 1, except that in this example 8, after the temperature of the temperature adjustment chamber was set at 55 ℃ or 60 ℃ or 70 ℃ or 80 ℃ in step a30), the weight, the glass plate, the contact laminated plate and the foam cotton were removed after the timer reached 60 minutes, and it was observed that no impression mark was generated in the area of the coating film of the press-contact substrate on the aluminum substrate relative to the area of the coating film of the non-press-contact substrate.
Comparative example 1: the remaining technical solution of comparative example 1 is the same as that of example 1, except that in comparative example 1, the transparent powder of GMA acrylic acid commercially available in comparative example 1 was used, and it was detected that the impression mark was generated.
The acrylic acid transparent powder coating of the comparative example 1 is provided for a hub manufacturer for package and transportation verification, and obvious indentation marks are fed back.
Comparative example 2: the rest of the technical scheme of the comparative example 2 is the same as that of the example 1, except that in the comparative example 2, the GMA acrylic transparent powder which is previously sold in batches by the applicant is adopted in the comparative example 2, and the impression mark is detected and observed to be generated.
The acrylic acid transparent powder coating of the comparative example 2 is provided for a hub manufacturer for package and transportation verification, and obvious indentation marks are fed back.
Comparative example 3: the rest of the technical solutions of the comparative example 3 are the same as those of the example 2, except that in the comparative example 3, the acrylic transparent powder which is previously sold in batches by the applicant is adopted in the comparative example 3, as shown in fig. 5, wherein c) is a picture of a substrate coating film to be detected before detection, B) is a picture of the substrate coating film according to the step B30), indentation marks are observed to be generated, and the indentation marks are clearer than those of the comparative example 2, and the indentation marks are basically consistent with the areas of the substrate coating films in press contact, so that the structural design of the spaced contact press plate provided by the example 2 is more favorable for detection accuracy.
Comparative example 4: the rest technical schemes of the comparative example 4 are the same as those of the embodiment 1, and the difference is that in the comparative example 4, the wrapping material with the plasticizer is adopted to protect the automobile hub after coating and cooling, and after high-temperature and long-time transportation, the problem that partial hub generates indentation is still found.
Comparative example 5: the rest technical scheme of the comparative example 5 is the same as that of the example 1, except that in the comparative example 5, when the transparent acrylic powder coating provided by the example 1 is applied to the automobile hub subsequently, the transparent acrylic powder coating is directly packaged and transported without a special cooling step, and still a more obvious indentation problem is found.
Thus, it can be seen from the above comparative examples 4 to 5 that, although the acrylic powder coating material proposed in the present application can improve the anti-indentation effect of the coating film, the coating film having been heat-cured is cooled for not less than 30 minutes in the subsequent application, while the package protection using a wrapping material having a plasticizer is not required, which are causes of the indentation of the coating film.
After comparison of a large number of examples by the applicant, the rapid detection technology for the indentation resistance of the coating film provided by the application can be used as a test technology for rapidly detecting the indentation effect of the coating film by a powder coating manufacturer, and the detection result is consistent with the subsequent actual verification result; on the premise of ensuring the detection accuracy, the film coating indentation effect detection technology provided by the application can obviously improve the detection efficiency, and meanwhile, the detection process is very simple and the cost is extremely low.
Meanwhile, the present application also performs performance testing on the coating film of the present embodiment, and the test results refer to table 7 below:
table 7: test results of the coating film of this example
After a large number of screening tests, the embodiment surprisingly discovers that specific screening selection is carried out on the relevant parameter range of GMA acrylic resin, the Tg of the transparent coating film after spraying and curing is at least not lower than 62 ℃, the transparent coating film has obviously better anti-indentation capacity compared with the conventional acrylic transparent powder in the prior art, and the acrylic transparent powder provided by the embodiment can effectively avoid or obviously reduce the indentation problem generated in the packaging and transporting process of the wheel hub product after being applied to the spraying and film forming of the wheel hub product.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (9)
1. The application of the acrylic acid transparent powder with the anti-indentation effect is characterized in that the acrylic acid transparent powder is sprayed on a workpiece to be sprayed and then heated and solidified into a transparent coating, wherein the workpiece which is heated and solidified is cooled, the cooling temperature range is 15-40 ℃, and the cooling time is not less than 30 minutes; the raw materials of the acrylic acid transparent powder comprise 70-90% of GMA acrylic resin and 8-28% of curing agent, wherein the melt index range of the GMA acrylic resin at 125 ℃ is not lower than 35g/10min, the viscosity range of the GMA acrylic resin at 150 ℃ is not higher than 80Pa.s, the epoxy equivalent range of the GMA acrylic resin is not higher than 700g/eq, and the Tg range of the acrylic acid transparent powder after spraying, curing and film forming is not lower than 62 ℃.
2. The use of the acrylic transparent powder according to claim 1, wherein the GMA acrylic resin has a melt index ranging from 40 to 70g/10min at 125 ℃, a viscosity ranging from 15 to 50 Pa-s at 150 ℃, and an epoxy equivalent ranging from 400-600 g/eq.
3. The use of the acrylic transparent powder of claim 1, wherein the curing agent is a decaalkyl diacid or a dodecyl diacid.
4. The use of the acrylic transparent powder as claimed in claim 1, wherein the curing temperature of the acrylic transparent powder is 175-180 ℃ and the curing time is 20-25 minutes.
5. The use of the transparent acrylic powder according to claim 1, wherein the method for detecting the anti-indentation effect comprises: carrying out press contact on a base material coating film to be detected placed on a detection operation table by adopting a contact press plate, and forming a press contact base material coating film area of the base material coating film to be detected, wherein the area of the press contact base material coating film area is smaller than that of the base material coating film to be detected; the gravity source is contacted with the upper part of the contact laminated plate through a transition lamination flat plate, the area of the transition lamination flat plate is larger than that of the lamination contact substrate coating area, and the gravity source is used for adjusting the uniform distribution of pressure applied to the lamination contact substrate coating area by the gravity source; and observing whether the film coating area of the press-fit contact substrate generates indentation marks relative to the film coating area of the non-press-fit contact substrate or not after the gravity source applies pressure to the film coating area of the press-fit contact substrate for a target time.
6. The use of the acrylic transparent powder according to claim 1, wherein the cooling means comprises placing the heated and solidified workpiece in a cooling environment chamber, and the cooling environment chamber adopts electric control cooling or natural cooling.
7. The use of the acrylic transparent powder according to claim 1, wherein the workpiece comprises a hub, and the transparent coating film serves as a cover surface of the hub.
8. The use of the acrylic transparent powder according to claim 7, wherein the hub after coating is protected by a wrapping material, and the wrapping material does not contain a plasticizing material.
9. The use of the acrylic transparent powder of claim 8, wherein the packaging material is made of foam cotton.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1074397A (en) * | 1992-01-15 | 1993-07-21 | 莫顿国际股份有限公司 | Prevent the method for filiform corrosion of alumin |
| KR20060077824A (en) * | 2004-12-31 | 2006-07-05 | 주식회사 케이씨씨 | Thermosetting acrylic clear powder coating composition for preparing coating with excellent corrosion resistance |
| CN109913074A (en) * | 2019-02-20 | 2019-06-21 | 六安捷通达新材料有限公司 | A kind of epoxy functional acrylic resin for transparent powder paint |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1074397A (en) * | 1992-01-15 | 1993-07-21 | 莫顿国际股份有限公司 | Prevent the method for filiform corrosion of alumin |
| KR20060077824A (en) * | 2004-12-31 | 2006-07-05 | 주식회사 케이씨씨 | Thermosetting acrylic clear powder coating composition for preparing coating with excellent corrosion resistance |
| CN109913074A (en) * | 2019-02-20 | 2019-06-21 | 六安捷通达新材料有限公司 | A kind of epoxy functional acrylic resin for transparent powder paint |
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