CN107858075B - Adhesive liquid and paint spraying method for applying adhesive liquid to surface of LED backboard - Google Patents
Adhesive liquid and paint spraying method for applying adhesive liquid to surface of LED backboard Download PDFInfo
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- CN107858075B CN107858075B CN201711212781.0A CN201711212781A CN107858075B CN 107858075 B CN107858075 B CN 107858075B CN 201711212781 A CN201711212781 A CN 201711212781A CN 107858075 B CN107858075 B CN 107858075B
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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
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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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
- B05D3/10—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 by other chemical means
- B05D3/102—Pretreatment of metallic substrates
-
- 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
- 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
- B05D7/50—Multilayers
- B05D7/56—Three layers or more
- B05D7/58—No clear coat specified
- B05D7/586—No clear coat specified each layer being cured, at least partially, separately
-
- 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
- B05D2503/00—Polyurethanes
-
- 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
- B05D2504/00—Epoxy polymers
-
- 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
- B05D2601/00—Inorganic fillers
- B05D2601/20—Inorganic fillers used for non-pigmentation effect
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
-
- 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
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
- C08L2203/206—Applications use in electrical or conductive gadgets use in coating or encapsulating of electronic parts
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention discloses an adhesive liquid and a paint spraying method applied to the surface of an LED backboard, wherein the adhesive liquid is prepared from the following raw materials in parts by weight: 40-60 parts of epoxy resin, 15-20 parts of a toughening agent, 8-12 parts of an adhesive, 5-8 parts of a diluent, 6-12 parts of attached particles, 6-8 parts of a silane coupling agent and 1-4 parts of a curing accelerator. In the paint spraying process of the surface of the LED backboard, the adjacent paint layers and the surface of the LED backboard are coated with a layer of adhesive liquid, so that the adhesive force of each paint layer can be obviously improved, cracks are not generated when the paint layers are vibrated, the falling rate of the paint layers in the working process is reduced, and the service life is prolonged.
Description
The technical field is as follows:
the invention relates to backboard processing, in particular to an adhesive liquid and a paint spraying method applied to the surface of an LED backboard.
Background art:
painting of metal surfaces is a method of protecting metals from oxidative corrosion. The corrosion phenomenon around us means that various materials are damaged under the action of the environment (the comprehensive action of chemical, electrochemical and a plurality of physical factors), and the performance is reduced or the state is degraded. Painting and coating on the surface of metal is an important means for maintaining corrosion resistance of metal. The good paint spraying protective layer keeps continuous, complete and undamaged, has good combination, and can be a barrier for inhibiting corrosive media from invading.
The back plate is one of indispensable parts in the LCD, the back plate needs to be uncoiled and blanked before being processed on a back plate production line, then is subjected to multiple processing procedures such as stamping, punching, trimming and punching through the back plate production line, and finally is sprayed, most of the LED back plates on the market at present adopt the traditional spraying process to spray paint, the paint layer on the surface of the LED back plate is easy to fall off in the using process, and on one hand, the falling rate is obviously increased when the environmental working temperature reaches 45-60 ℃; on the other hand, cracks appear at the positions of the vibration receiving parts, and meanwhile, the vibration receiving parts can also fall off to a certain degree; in addition, the spraying process of the conventional method.
The invention content is as follows:
in order to overcome the defects of the prior art, the invention aims to provide the adhesive liquid and the paint spraying method applied to the surface of the LED backboard, which can effectively reduce the falling off of the paint layer on the surface of the LED backboard and prolong the service life.
The technical scheme of the invention is as follows:
the adhesive liquid is characterized by comprising the following raw materials in parts by weight: 40-60 parts of epoxy resin, 15-20 parts of a toughening agent, 8-12 parts of an adhesive, 5-8 parts of a diluent, 6-12 parts of attached particles, 6-8 parts of a silane coupling agent and 1-4 parts of a curing accelerator.
The adhesive liquid is characterized in that the toughening agent adopts nano calcium carbonate and nano titanium dioxide, and the proportion relation of the nano calcium carbonate to the nano titanium dioxide is (1-2) to (2-4).
The adhesive liquid is characterized in that the adhesive adopts polyamide resin and polyester resin, and the proportion relation of the polyamide resin to the polyester resin is (1-2) to (2-6).
The adhesive liquid is characterized in that the diluent adopts clay, glass fiber, silica gel powder, alumina and quartz powder in a weight ratio of 1:1:1:1: 2.
The adhesive liquid is characterized in that the adhesive particles are made of carborundum, the particle size of the diamond particles is 0.8-18 microns, and the total weight of the carborundum accounts for 3-5% of the mass of the adhesive liquid.
The adhesive liquid is characterized in that the curing accelerator adopts triethanolamine and DPM-30, the ratio of the triethanolamine to the DPM-30 is 2:1, and the mass fraction of the DPM-30 in the adhesive liquid is 0.5-2.0%.
A method for painting the surface of an LED backboard by using the adhesive liquid as claimed in claim 1, which comprises the steps of,
1) after the LED backboard is punched and formed, removing dust on the surface, and performing blowing dust removal, clean water cleaning and compressed air blowing cleaning by compressed air until the surface is dry;
2) cleaning primary oil stains on the surface of the dried LED backboard, sequentially cleaning by using a sodium hydroxide aqueous solution, a hydrochloric acid aqueous solution and clear water, and then air-drying;
3) carrying out secondary oil stain cleaning on the surface of the dried LED backboard, putting the LED backboard into an acetone steam tank for oil removal, controlling the temperature to be 62-64 ℃, treating for 13-18 min, taking out and airing;
4) spraying the adhesive liquid on the surface of the LED backboard, coating the first layer in a normal-temperature environment, airing for 8-10 min, and performing steam hot air circulation heating and drying for 10-15 min; coating the second layer, airing for 8-12 min, performing steam hot air circulation heating and drying for 10-15 min, then naturally cooling, and coating the two uniform layers to form an inner attachment layer without bubbles on the surface;
5) in a paint spraying chamber, spraying epoxy paint serving as a primer outside the attachment layer by using a spray gun, and drying after spraying is finished, wherein the time is controlled to be 15-20 min, and the baking temperature is 60-62 ℃;
6) spraying the adhesive liquid outside the primer, airing for 12-15 min in a normal temperature environment, performing steam hot air circulation heating and drying for 10-15 min, then naturally cooling, and uniformly spraying to form an intermediate adhesive layer without bubbles on the surface;
7) spraying polyurethane intermediate paint outside the intermediate attachment layer in a high-pressure airless paint spraying mode, heating and drying by hot air circulation, controlling the time to be 30-35 min, controlling the baking temperature to be 62-65 ℃, and naturally cooling;
8) spraying the adhesive liquid outside the polyurethane intermediate paint, airing for 15-20 min in a normal-temperature environment, performing steam hot air circulation heating and drying for 10-15 min, then naturally cooling, and uniformly spraying to form an outer adhesive layer without bubbles on the surface;
9) and spraying finish paint outside the outer attachment layer by adopting a high-pressure airless paint spraying mode, heating and drying by steam and hot air circulation, controlling the time to be 30-35 min, controlling the baking temperature to be 65-68 ℃, and naturally cooling.
The paint spraying method for the surface of the LED backboard is characterized in that the thickness of a first layer of the inner adhesion layer is 50-80 micrometers, and the thickness of a second layer of the inner adhesion layer is 25-35 micrometers.
The paint spraying method for the surface of the LED backboard is characterized in that the thickness of the middle adhesion layer is 60-80 microns.
The paint spraying method for the surface of the LED backboard is characterized in that the thickness of the outer attached layer is 50-70 microns.
The invention has the advantages that:
1. the method adopts the reasonably-configured adhesive solution, the adhesive solution contains adhesive particles, the adhesive particles adopt carborundum, the particle size of the diamond particles is 0.8-18 microns, the total weight of the carborundum accounts for 3-5% of the mass fraction of the adhesive solution, the adhesive solution is uniformly coated, and the surface of the adhesive layer forms a point-shaped anti-falling structure after drying;
2. in the process of spraying the surface of the LED backboard, a layer of adhesive liquid coating layer is respectively arranged between the backboard and the primer, between the primer and the intermediate paint, and between the intermediate paint and the finish paint, so that the adhesive force of the paint layer can be obviously improved;
3. after the surface of the LED backboard is sprayed, practice proves that: the peeling rate of the paint layer is changed from 8% to zero at 45-60 ℃, and is reduced from 8-15% to (0.5-1)%, at 60-65 ℃;
4. after the surface of the LED backboard is sprayed, the practice proves that the crack occurrence rate of a paint layer is obviously reduced under the same vibration test condition compared with the spraying of the traditional process.
The specific implementation mode is as follows:
the technical solutions of the present invention are explained below to facilitate understanding for those skilled in the art.
The adhesive liquid consists of the following raw materials in parts by weight: 40-60 parts of epoxy resin, 15-20 parts of a toughening agent, 8-12 parts of an adhesive, 5-8 parts of a diluent, 6-12 parts of attached particles, 6-8 parts of a silane coupling agent and 1-4 parts of a curing accelerator.
The toughening agent adopts nano calcium carbonate and nano titanium dioxide, and the proportion relation of the nano calcium carbonate and the nano titanium dioxide is (1-2) to (2-4).
The diluent adopts clay, glass fiber, silica gel powder, alumina and quartz powder with the weight ratio of 1:1:1:1: 2.
The adhesive is prepared from polyamide resin and polyester resin, wherein the ratio of polyamide resin to polyester resin is (1-2) to (2-6).
The adhesive particles are made of carborundum, the grain size of the diamond particles is 0.8-18 microns, the total weight of the carborundum accounts for 3% -5% of the mass fraction of the adhesive liquid, the adhesive liquid is uniformly coated, and after drying, the surface of the adhesive layer forms a point-shaped anti-falling structure, so that the adhesive force of outer layer spraying can be increased.
The curing accelerator adopts triethanolamine and DPM-30, the ratio of the triethanolamine to the DPM-30 is 2:1, wherein the mass fraction of the DPM-30 in the adhesive liquid is 0.5-2.0%, and the physical property and the chemical use property of a cured product are not influenced through detection.
A method for spraying paint on the surface of an LED backboard by using adhesive liquid comprises the following steps,
1) after the LED backboard is punched and formed, removing dust on the surface, and performing blowing dust removal, clean water cleaning and compressed air blowing cleaning by compressed air until the surface is dry;
2) cleaning primary oil stains on the surface of the dried LED backboard, sequentially cleaning by using a sodium hydroxide aqueous solution, a hydrochloric acid aqueous solution and clear water, and then air-drying;
3) carrying out secondary oil stain cleaning on the surface of the dried LED backboard, putting the LED backboard into an acetone steam tank for oil removal, controlling the temperature to be 62-64 ℃, treating for 13-18 min, taking out and airing;
4) spraying the adhesive liquid on the surface of the LED backboard, coating the first layer in a normal-temperature environment, airing for 8-10 min, and performing steam hot air circulation heating and drying for 10-15 min; coating the second layer, airing for 8-12 min, performing steam hot air circulation heating and drying for 10-15 min, then naturally cooling, and coating the two uniform layers to form an inner attachment layer without bubbles on the surface;
5) in a paint spraying chamber, spraying epoxy paint serving as a primer outside the attachment layer by using a spray gun, and drying after spraying is finished, wherein the time is controlled to be 15-20 min, and the baking temperature is 60-62 ℃;
6) spraying the adhesive liquid outside the primer, airing for 12-15 min in a normal temperature environment, performing steam hot air circulation heating and drying for 10-15 min, then naturally cooling, and uniformly spraying to form an intermediate adhesive layer without bubbles on the surface;
7) spraying polyurethane intermediate paint outside the intermediate attachment layer in a high-pressure airless paint spraying mode, heating and drying by hot air circulation, controlling the time to be 30-35 min, controlling the baking temperature to be 62-65 ℃, and naturally cooling;
8) spraying the adhesive liquid outside the polyurethane intermediate paint, airing for 15-20 min in a normal-temperature environment, performing steam hot air circulation heating and drying for 10-15 min, then naturally cooling, and uniformly spraying to form an outer adhesive layer without bubbles on the surface;
9) and spraying finish paint outside the outer attachment layer by adopting a high-pressure airless paint spraying mode, heating and drying by steam and hot air circulation, controlling the time to be 30-35 min, controlling the baking temperature to be 65-68 ℃, and naturally cooling.
The first layer of the inner adhesion layer is 50-80 microns thick, and the second layer of the inner adhesion layer is 25-35 microns thick; the thickness of the middle adhesion layer is 60-80 microns; the thickness of the outer adhesive layer is 50-70 microns, and the thicknesses of the inner adhesive layer, the middle adhesive layer and the outer adhesive layer are generally operated according to the trend of thinning in sequence in the using process, and are adjusted according to actual conditions.
The paint hundred lattice test experiment of the invention: ISO class: 0 — ASTM rating: the edges of the 5B cut were completely smooth without any flaking of the grid edges.
The invention has been described in an illustrative manner, and it is to be understood that the invention is not limited in its application to the details of construction and to the arrangements of the components set forth in the following description, since such modifications are intended to be included within the spirit and scope of the invention as defined in the appended claims.
Claims (4)
1. A paint spraying method for the surface of an LED backboard is characterized by comprising the following steps,
1) after the LED backboard is punched and formed, removing dust on the surface, and performing blowing dust removal, clean water cleaning and compressed air blowing cleaning by compressed air until the surface is dry;
2) cleaning primary oil stains on the surface of the dried LED backboard, sequentially cleaning by using a sodium hydroxide aqueous solution, a hydrochloric acid aqueous solution and clear water, and then air-drying;
3) carrying out secondary oil stain cleaning on the surface of the dried LED backboard, putting the LED backboard into an acetone steam tank for oil removal, controlling the temperature to be 62-64 ℃, treating for 13-18 min, taking out and airing;
4) spraying the adhesive liquid on the surface of the LED backboard, coating the first layer in a normal-temperature environment, airing for 8-10 min, and performing steam hot air circulation heating and drying for 10-15 min; coating the second layer, airing for 8-12 min, performing steam hot air circulation heating and drying for 10-15 min, then naturally cooling, and coating the two uniform layers to form an inner attachment layer without bubbles on the surface;
5) in a paint spraying chamber, spraying epoxy paint serving as a primer outside the attachment layer by using a spray gun, and drying after spraying is finished, wherein the time is controlled to be 15-20 min, and the baking temperature is 60-62 ℃;
6) spraying the adhesive liquid outside the primer, airing for 12-15 min in a normal temperature environment, performing steam hot air circulation heating and drying for 10-15 min, then naturally cooling, and uniformly spraying to form an intermediate adhesive layer without bubbles on the surface;
7) spraying polyurethane intermediate paint outside the intermediate attachment layer in a high-pressure airless paint spraying mode, heating and drying by hot air circulation, controlling the time to be 30-35 min, controlling the baking temperature to be 62-65 ℃, and naturally cooling;
8) spraying the adhesive liquid outside the polyurethane intermediate paint, airing for 15-20 min in a normal-temperature environment, performing steam hot air circulation heating and drying for 10-15 min, then naturally cooling, and uniformly spraying to form an outer adhesive layer without bubbles on the surface;
9) spraying finish paint outside the outer attachment layer by adopting a high-pressure airless paint spraying mode, circularly heating and drying by steam and hot air for 30-35 min at the baking temperature of 65-68 ℃, naturally cooling,
the adhesive liquid is prepared from the following raw materials in parts by weight: 40-60 parts of epoxy resin, 15-20 parts of toughening agent, 8-12 parts of adhesive, 5-8 parts of diluent, 6-12 parts of attached particles, 6-8 parts of silane coupling agent and 1-4 parts of curing accelerator,
the toughening agent adopts nano calcium carbonate and nano titanium dioxide, the proportion relation of the nano calcium carbonate and the nano titanium dioxide is (1-2) to (2-4),
the adhesive adopts polyamide resin and polyester resin, the proportion relation of the polyamide resin and the polyester resin is (1-2) to (2-6),
the diluent adopts clay, glass fiber, silica gel powder, alumina and quartz powder with the weight ratio of 1:1:1:1:2,
the adhesive particles are made of carborundum, the particle size of the diamond particles is 0.8-18 microns, the mass fraction of the total weight of the carborundum in the adhesive liquid is 3-5%,
the curing accelerator adopts triethanolamine and DPM-30, the ratio of the triethanolamine to the DPM-30 is 2:1, and the mass fraction of the DPM-30 in the adhesive liquid is 0.5-2.0%.
2. The method for painting the surface of the LED backboard according to claim 1, wherein the thickness of the first layer of the inner attached layer is 50-80 microns, and the thickness of the second layer is 25-35 microns.
3. The method for painting the surface of the LED backboard according to claim 1, wherein the thickness of the intermediate adhesion layer is 60-80 microns.
4. The method for painting the surface of the LED backboard according to claim 1, wherein the thickness of the outer attached layer is 50-70 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711212781.0A CN107858075B (en) | 2017-11-28 | 2017-11-28 | Adhesive liquid and paint spraying method for applying adhesive liquid to surface of LED backboard |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711212781.0A CN107858075B (en) | 2017-11-28 | 2017-11-28 | Adhesive liquid and paint spraying method for applying adhesive liquid to surface of LED backboard |
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| Publication Number | Publication Date |
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| CN107858075A CN107858075A (en) | 2018-03-30 |
| CN107858075B true CN107858075B (en) | 2020-04-10 |
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| CN114316742A (en) * | 2021-12-24 | 2022-04-12 | 深圳市图特美高分子材料有限公司 | Coating for circuit board base plate and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101804716A (en) * | 2010-03-26 | 2010-08-18 | 长沙学院 | organic composite coating for impeller |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101804716A (en) * | 2010-03-26 | 2010-08-18 | 长沙学院 | organic composite coating for impeller |
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