CN113318947A - Production method of three-coating wide color-coated plate - Google Patents
Production method of three-coating wide color-coated plate Download PDFInfo
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- CN113318947A CN113318947A CN202110590059.0A CN202110590059A CN113318947A CN 113318947 A CN113318947 A CN 113318947A CN 202110590059 A CN202110590059 A CN 202110590059A CN 113318947 A CN113318947 A CN 113318947A
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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
- 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
- B05D5/065—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 having colour interferences or colour shifts or opalescent looking, flip-flop, two tones
- B05D5/066—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 having colour interferences or colour shifts or opalescent looking, flip-flop, two tones achieved by multilayers
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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
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/28—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
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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
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/36—Successively applying liquids or other fluent materials, e.g. without intermediate treatment
- B05D1/38—Successively applying liquids or other fluent materials, e.g. without intermediate treatment with intermediate treatment
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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
- B05D3/02—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 baking
- B05D3/0254—After-treatment
- B05D3/0272—After-treatment with ovens
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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
- 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
- B05D7/14—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 to metal, e.g. car bodies
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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
- 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
- B05D7/584—No clear coat specified at least some layers being let to dry, at least partially, before applying the next layer
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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
- B05D2202/00—Metallic substrate
- B05D2202/10—Metallic substrate based on Fe
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Abstract
The invention discloses a method for producing a three-coating wide color-coated plate with the width more than 1500mm, which comprises the following steps of coating a structure 3/1, coating three on the upper surface and drying three times, and coating one on the back surface: before production, cleaning the whole-line roller system, including a turning roller and a supporting roller of a coating machine, so as to avoid the influence of foreign matters on the roller surface on the quality of the edge of the wide-width plate; using 1-2 rolls of steel as a front guide, observing the state of a plate surface, and carrying out formal production after confirming that the surface has no defects such as impression and the like; the production line speed of the machine set is 80m/min, the coating is carried out in two times, the coating is carried out on a primary coating machine for the first time, the priming paint on the upper surface and the priming paint on the lower surface are coated, and the baking and the cooling are carried out; and after coating, cleaning the primer plate on the upper surface, replacing the floating coat, pouring the steel coil to an inlet, closing the cleaning section and the pretreatment section, coating the floating coat and the finish coat for the second time, preparing the finish coat paint in a finish coater, and baking and cooling after coating. The three-coating wide color plate has good edge control, and the surface quality and various coating performances of the plate surface meet the requirements.
Description
Technical Field
The invention relates to a production method of a color-coated plate, in particular to a production method of a three-coating wide color-coated plate with the width of more than 1500mm, belonging to the technical field of steel color coating.
Background
The color coated steel plate (hereinafter referred to as color coated plate) is a composite material formed by coating one or more layers of organic coatings on the surface of a metal substrate after the metal substrate passes through a color roller coating unit. The steel plate has the advantages of both steel plate and organic material, so that the steel plate has the advantages of mechanical strength and formability of the steel plate, and has good decoration and corrosion resistance of the organic material, and the steel plate is widely applied to industries such as buildings, household appliances, decoration, transportation, packaging, vehicle manufacturing and the like.
At present, the production method of the color-coated plate is developed from one-coating one-baking to two-coating two-baking, and a three-coating three-baking process appears. The surface state of the color-coated sheet can be classified into a normal coated sheet, an embossed sheet, a printed sheet, and the like. The common technological process of the double-coating double-drying continuous color coating unit mainly comprises the following production procedures: uncoiling → pretreatment → priming → baking → finish coating → baking → post-treatment → coiling. The common two-coat two-bake color coating unit coats the primer and the topcoat once. The primer can be coated with a single layer or a double layer according to the use requirements of users. The performance and the application of the color coated plates with different coatings are slightly different according to the structure of the paint layer. 2/1 is a single-layer back finish, has poor back corrosion resistance and scratch resistance, but has good cohesiveness, and is mainly applied to sandwich panels; the 2/1M structure back paint has good corrosion resistance, scratch resistance and processing formability, has good caking property, and is suitable for single-layer contour plates and sandwich plates; 2/2 the structure is double-layer back paint, which has better corrosion resistance, scratch resistance and processing formability, is mostly used for single-layer contour plates, but has poor caking property, and is not suitable for sandwich plates.
Generally, the film thickness of a two-coating color coating product is below 25 mu m, and the market demand of a three-coating color coating product is continuously expanded along with the increase of the demand of users on the color coating products with high corrosion resistance, weather resistance and long service life. The film thickness of the three-coating color coating product is generally more than 30 mu m, the three-coating color coating product is a product with high quality, long service life and high cost, and is mainly applied to sports stadiums, airport buildings, large power plants and other domestic and foreign important engineering construction projects and buildings with severe environment. The three-coating product generally has a coating (front surface) consisting of three layers of coatings, including a base coating, a middle coating and a top coating, and the back surface can be coated with 2 or 3 layers of coatings according to requirements. The coating process of the three-coating product has two types, one is direct three-coating and three-baking, and the other is that the three-coating and three-baking is realized through two coatings on the basis of the original two-coating and two-baking, so that the requirement on the quality control of the product is high. For some special applications, a color-coated sheet with a width of 1400mm or more is required, which is called a wide-format color-coated sheet, and the requirement for production control is higher. At present, in the published patents and documents at home and abroad, no report is available about the production of three-coating wide-width color-coated plates by a two-coating and two-baking machine set.
Disclosure of Invention
The invention aims to produce a high-quality three-coating color plate without changing the structural form of the existing two-coating and two-drying machine set, and simultaneously has the width attribute of the limit specification of a wide color plate.
The invention is realized in such a way that:
a production method of a three-coating wide color-coated plate, which is a coating structure 3/1, wherein the upper surface is coated with three times and dried, and the back surface is coated with one time, is suitable for the current large-scale two-coating two-drying color coating production unit, and specifically comprises the following steps:
before production, the whole-line roller system is cleaned, especially a turning roller and a support roller of a coating machine, so that the influence of foreign matters on the roller surface on the quality of the edge of the wide-width plate is avoided. And (3) taking 1-2 rolls of steel as a front guide, observing the state of the plate surface, and carrying out formal production after confirming that the surface has no defects such as impression and the like.
The technological speed of the machine set is 80m/min, the coating is carried out in two times, the coating is carried out on the primary coating machine for the first time, the priming paint is coated on the upper surface and the lower surface, and the baking and the cooling are carried out. And after coating, cleaning the primer plate on the upper surface, replacing the floating coat, pouring the steel coil to an inlet, closing the cleaning section and the pretreatment section, coating the floating coat and the finish coat for the second time, preparing the finish coat paint in a finish coater, and baking and cooling after coating.
The further scheme is as follows:
the film thickness distribution proportion is as follows: back primer: 5-7 μm, 5-7 μm front primer, 18-20 μm front middle paint and 8-10 μm front finish.
The further scheme is as follows:
the production line speed is 80m/min, and the pretreatment process comprises primary alkali washing, primary composite oxidation, primary hot water rinsing, secondary composite oxidation, secondary hot water rinsing, tertiary hot water rinsing and chemical treatment (chemical coating). The conductivity of the No. 1 alkaline washing tank is 10 +/-1 ms/cm, the free alkali is 3.5-5.0 (10ml), the conductivity of the No. 2 composite oxidation tank is 50 +/-5 ms/cm, the free alkali is 5.0-8.0 (2ml), the conductivity of the No. 4 composite oxidation tank is 55 +/-5 ms/cm, and the free alkali is 5.0-8.0 (2 ml). The strip steel is subjected to passivation treatment by a chemical coating tank in a two-roller reverse coating mode, the chromium point of the chemical coating tank is 15-30 (10ml), and the conductivity is 7 +/-1 ms/cm.
The further scheme is as follows:
the first coating process: front and back priming paint. The two-roll reverse coating is adopted, the kinematic viscosity of the coating is 130 +/-5 cts (35 ℃) of the front surface primer, and the kinematic viscosity of the back surface primer is 80 +/-5 cts (35 ℃). And (5) performing primer coating on the upper surface and the lower surface of the coating on a primary coating machine. The specific process for controlling the roll speed and pressure to ensure the surface quality of the edge of the wide board is shown in table 1 below.
TABLE 1 control of the first primer application Process
| Primer front side | Primer backing | |
| Roll speed (coating roll (m/min)) | 100±10 | 100±10 |
| Roller speed (with material roller) | 50±10 | 50±10 |
| Pressure (kg) between coating roller and strip roller | 1600±10 | 1600±10 |
| Coating roller and strip pressure (kg) | 100～300 | - |
The further scheme is as follows:
and (3) a second coating process: and (4) intermediate paint and finish paint. And pouring the steel coil subjected to the first coating process to an inlet, simultaneously cleaning an upper surface primer plate, replacing intermediate painting, and preparing finish paint on a finish painting plate. Cleaning the foreign matters such as the surface adhesive tape and the like, and closing the cleaning section and the chemical coating section. The kinematic viscosity of the middle coating is set to be 320 +/-5 cts (35 ℃), and the kinematic viscosity of the finish coating is set to be 150 +/-5 cts (35 ℃). In order to ensure the surface quality of the edge of the wide board, the roll speed and pressure are controlled, and the specific process is shown in table 2 below.
TABLE 2 control chart of the production method of the second coating of the middle and top paints
The further scheme is as follows:
and (5) baking. The invention adopts a one-stage furnace temperature baking mode, has simple operation and avoids unstable product quality caused by complex production method. The specific process is shown in table 3 below. The strip steel is cooled by a water cooling tower (an internal and external circulating system), and the water cooling temperature is less than or equal to 45 ℃.
TABLE 3 baking Process parameters
The invention has the following beneficial effects:
(1) the invention creatively utilizes the two-coating and two-baking machine set to directly produce the three-coating wide color plate, the front and back priming paint is coated in the first production, the middle paint and the finish paint are coated in the second production, and the damage to the middle paint caused by back and forth transportation is avoided. The film thickness and the plate shape are controlled by kinematic viscosity, roller speed and pressure, so that the coating integrity and excellent surface quality of the edge of a 1500mm wide color plate are ensured;
(2) according to the invention, the baking process of the primer, the intermediate paint and the finish paint is innovatively set as a one-stage baking process, so that the manual operation errors caused by the stage process are avoided, and the product quality is unstable. The operation is simple, and the production method is easy to control;
(3) the thickness of the three-coating wide color plate produced by the invention is more than or equal to 33 μm, and the surface quality of the edge part is excellent. The surface color difference delta E of the product coating is less than or equal to 0.45, the glossiness (60 ℃) is 30-35, the T bend is less than or equal to 2T, the reverse impact is 9J, the MEK wiping resistance is over 100 times, the pencil hardness can reach F level, the surface quality of the board surface and various coating performances are excellent, and the requirements are met.
The invention creatively utilizes the prior two-coating and two-baking machine set to produce the three-coating wide color-coated plate with excellent surface quality, wherein the width of the color-coated plate can be 1500mm, and the total coating thickness of the front surface is more than or equal to 33 mu m. The method adopts a one-stage furnace temperature control method of primary coating, intermediate coating and top coating, is simple to operate and easy to control; the method of firstly coating the front surface primer and the back surface primer and then coating the front surface intermediate paint and the top paint is adopted, so that the intermediate paint damage caused by back and forth movement is avoided, and the integrity of the coating is ensured; the roller system and the channel line are completely cleaned, the coating thickness is adjusted by innovatively utilizing the movement viscosity, the roller speed and the pressure of the coating, and the surface quality of the edge of the wide plate is controlled. The three-coating wide color plate produced by the production method has good edge control, and the surface quality and various coating properties of the plate surface meet the requirements.
Detailed Description
The color coating is composed of front polyurethane primer and back epoxy primer; a high durability intermediate coat; the production speed of the machine set is 80 m/min.
The following description will explain specific embodiments.
Example 1: the pretreatment process comprises the following steps: the conductivity of the No. 1 alkaline washing tank is 10ms/cm, and the free alkali is 4.0; the conductivity of the No. 2 composite oxidation tank is 50ms/cm, and the free alkali is 6.0; the conductivity of the No. 4 composite oxidation tank is 55ms/cm, and the free alkali is 6.0(2 ml); the chemical coating bath had a chromium point of 20(10ml) and an electrical conductivity of 7 ms/cm. The first primer coating production method comprises the following steps: the kinematic viscosity of the front coating is 130cts, the roller speed of a coating roller is 95m/min, the roller speed of a material carrying roller is 50m/min, the pressure between the coating roller and the material carrying roller is 1600kg, and the pressure between the coating roller and the strip steel is 100 kg; the kinematic viscosity of the back coating is 80cts, the roller speed of a coating roller is 100m/min, the roller speed of a material carrying roller is 55m/min, and the pressure between the coating roller and the material carrying roller is 1590 kg; the baking temperature PMT of the primer steel plate is 224 ℃. The production method of the secondary coating intermediate coat and finish coat comprises the following steps: the kinematic viscosity of the intermediate coating is 320cts (35 ℃), the roller speed of a coating roller is 105m/min, the roller speed of a strip roller is 65m/min, the pressure between the coating roller and the strip roller is 1600kg, the pressure between the coating roller and the strip steel is 200kg, and the baking temperature PMT of the intermediate coating steel plate is 226 ℃. The kinematic viscosity of the finish paint is 150cts (35 ℃), the roller speed of a coating roller is 100m/min, the roller speed of a material carrying roller is 55m/min, the pressure between the coating roller and the material carrying roller is 1600kg, and the pressure between the coating roller and the strip steel is 200 kg; the baking temperature PMT of the finish steel plate is 232 ℃.
Example 2: the pretreatment process comprises the following steps: the conductivity of the No. 1 alkaline washing tank is 9ms/cm, and the free alkali is 4.0; the conductivity of the No. 2 composite oxidation tank is 52ms/cm, and the free alkali is 6.5; the conductivity of the No. 4 composite oxidation tank is 56ms/cm, and the free alkali is 6.5(2 ml); the chemical coating bath had a chromium point of 22(10ml) and an electrical conductivity of 7 ms/cm. The first primer coating production method comprises the following steps: the kinematic viscosity of the front coating is 125cts, the roller speed of a coating roller is 100m/min, the roller speed of a material carrying roller is 55m/min, the pressure between the coating roller and the material carrying roller is 1600kg, and the pressure between the coating roller and the strip steel is 200 kg; the kinematic viscosity of the back coating is 82cts, the roller speed of a coating roller is 95m/min, the roller speed of a material carrying roller is 55m/min, and the pressure between the coating roller and the material carrying roller is 1600 kg; the baking temperature PMT of the priming steel plate is 226 ℃. The production method of the secondary coating intermediate coat and finish coat comprises the following steps: the kinematic viscosity of the intermediate coating is 322cts (35 ℃), the roller speed of a coating roller is 102m/min, the roller speed of a material carrying roller is 62m/min, the pressure between the coating roller and the material carrying roller is 1590kg, the pressure between the coating roller and the steel strip is 150kg, and the baking temperature PMT of the intermediate coating steel plate is 228 ℃. The kinematic viscosity of the finish paint is 152cts (35 ℃), the roller speed of a coating roller is 90m/min, the roller speed of a material carrying roller is 50m/min, the pressure between the coating roller and the material carrying roller is 1590kg, and the pressure between the coating roller and the strip steel is 150 kg; the baking temperature PMT of the finish steel plate is 230 ℃.
Example 3: the pretreatment process comprises the following steps: the conductivity of the No. 1 alkaline washing tank is 11ms/cm, and the free alkali is 3.8; the conductivity of the No. 2 composite oxidation tank is 55ms/cm, and the free alkali is 7.0; the conductivity of the No. 4 composite oxidation tank is 58ms/cm, and the free alkali is 7.0(2 ml); the chemical coating bath had a chromium point of 25(10ml) and an electrical conductivity of 6.5 ms/cm. The first primer coating production method comprises the following steps: the kinematic viscosity of the front coating is 128cts, the roller speed of a coating roller is 105m/min, the roller speed of a material carrying roller is 58m/min, the pressure between the coating roller and the material carrying roller is 1605kg, and the pressure between the coating roller and the strip steel is 150 kg; the kinematic viscosity of the back coating is 78cts, the roller speed of a coating roller is 100m/min, the roller speed of a material carrying roller is 56m/min, and the pressure between the coating roller and the material carrying roller is 1610 kg; the baking temperature PMT of the primer steel plate is 224 ℃. The production method of the secondary coating intermediate coat and finish coat comprises the following steps: the kinematic viscosity of the intermediate coating is 318cts (35 ℃), the roller speed of a coating roller is 110m/min, the roller speed of a strip roller is 70m/min, the pressure between the coating roller and the strip roller is 1600kg, the pressure between the coating roller and the strip steel is 250kg, and the baking temperature PMT of the intermediate coating steel plate is 226 ℃. The kinematic viscosity of the finish paint is 148cts (35 ℃), the roller speed of a coating roller is 100m/min, the roller speed of a material carrying roller is 55m/min, the pressure between the coating roller and the material carrying roller is 1600kg, and the pressure between the coating roller and the strip steel is 200 kg; the baking temperature PMT of the finish steel plate is 232 ℃.
Example 4: the pretreatment process comprises the following steps: the conductivity of the No. 1 alkaline washing tank is 9.5ms/cm, and the free alkali is 4.0; the conductivity of the No. 2 composite oxidation tank is 58ms/cm, and the free alkali is 7.2; the conductivity of the No. 4 composite oxidation tank is 54ms/cm, and the free alkali is 6.8(2 ml); the chemical coating bath had a chromium point of 18(10ml) and an electrical conductivity of 7.2 ms/cm. The first primer coating production method comprises the following steps: the kinematic viscosity of the front coating is 134cts, the roller speed of a coating roller is 108m/min, the roller speed of a material carrying roller is 56m/min, the pressure between the coating roller and the material carrying roller is 1608kg, and the pressure between the coating roller and the strip steel is 210 kg; the kinematic viscosity of the back coating is 82cts, the roller speed of a coating roller is 108m/min, the roller speed of a material carrying roller is 58m/min, and the pressure between the coating roller and the material carrying roller is 1595 kg; the baking temperature PMT of the priming steel plate is 226 ℃. The production method of the secondary coating intermediate coat and finish coat comprises the following steps: the kinematic viscosity of the intermediate coating is 325cts (35 ℃), the roller speed of a coating roller is 110m/min, the roller speed of a material carrying roller is 72m/min, the pressure between the coating roller and the material carrying roller is 1605kg, the pressure between the coating roller and the strip steel is 280kg, and the baking temperature PMT of the intermediate coating steel plate is 226 ℃. The kinematic viscosity of the finish paint is 152cts (35 ℃), the roller speed of a coating roller is 102m/min, the roller speed of a material carrying roller is 58m/min, the pressure between the coating roller and the material carrying roller is 1605kg, and the pressure between the coating roller and the strip steel is 220 kg; the baking temperature PMT of the finish steel plate is 226 ℃.
Example 5: the pretreatment process comprises the following steps: the conductivity of the No. 1 alkaline washing tank is 10.2ms/cm, and the free alkali is 4.2; the conductivity of the No. 2 composite oxidation tank is 48ms/cm, and the free alkali is 6.8; the conductivity of the No. 4 composite oxidation tank is 58ms/cm, and the free alkali is 7.0(2 ml); the chrome spot of the chemical coating bath was 22(10ml), and the conductivity was 7.2 ms/cm. The first primer coating production method comprises the following steps: the kinematic viscosity of the front coating is 132cts, the roller speed of a coating roller is 105m/min, the roller speed of a material carrying roller is 58m/min, the pressure between the coating roller and the material carrying roller is 1598kg, and the pressure between the coating roller and the strip steel is 250 kg; the kinematic viscosity of the back coating is 78cts, the roller speed of a coating roller is 105m/min, the roller speed of a material carrying roller is 55m/min, and the pressure between the coating roller and the material carrying roller is 1595 kg; the baking temperature PMT of the priming steel plate is 228 ℃. The production method of the secondary coating intermediate coat and finish coat comprises the following steps: the kinematic viscosity of the intermediate coating is 318cts (35 ℃), the roller speed of a coating roller is 105m/min, the roller speed of a strip roller is 58m/min, the pressure between the coating roller and the strip roller is 1600kg, the pressure between the coating roller and the strip steel is 260kg, and the baking temperature PMT of the intermediate coating steel plate is 228 ℃. The kinematic viscosity of the finish paint is 154cts (35 ℃), the roller speed of a coating roller is 105m/min, the roller speed of a material carrying roller is 60m/min, the pressure between the coating roller and the material carrying roller is 1600kg, and the pressure between the coating roller and the strip steel is 250 kg; the baking temperature PMT of the finish steel plate is 228 ℃.
Example 6: the pretreatment process comprises the following steps: the conductivity of the No. 1 alkaline washing tank is 10.5ms/cm, and the free alkali is 4.5; the conductivity of the No. 2 composite oxidation tank is 52ms/cm, and the free alkali is 7.2; the conductivity of the No. 4 composite oxidation tank is 60ms/cm, and the free alkali is 5.8(2 ml); the chemical coating bath had a chromium spot of 25(10ml) and an electrical conductivity of 7.5 ms/cm. The first primer coating production method comprises the following steps: the kinematic viscosity of the front coating is 128cts, the roller speed of a coating roller is 108m/min, the roller speed of a material carrying roller is 55m/min, the pressure between the coating roller and the material carrying roller is 1600kg, and the pressure between the coating roller and the strip steel is 270 kg; the kinematic viscosity of the back coating is 83cts, the roller speed of a coating roller is 108m/min, the roller speed of a material carrying roller is 58m/min, and the pressure between the coating roller and the material carrying roller is 1605 kg; the baking temperature PMT of the priming steel plate is 226 ℃. The production method of the secondary coating intermediate coat and finish coat comprises the following steps: the kinematic viscosity of the intermediate coating is 322cts (35 ℃), the roller speed of a coating roller is 102m/min, the roller speed of a material carrying roller is 52m/min, the pressure between the coating roller and the material carrying roller is 1605kg, the pressure between the coating roller and the steel strip is 265kg, and the baking temperature PMT of the intermediate coating steel plate is 228 ℃. The kinematic viscosity of the finish paint is 146cts (35 ℃), the roller speed of a coating roller is 102m/min, the roller speed of a material carrying roller is 62m/min, the pressure between the coating roller and the material carrying roller is 1605kg, and the pressure between the coating roller and the strip steel is 260 kg; the baking temperature PMT of the finish steel plate is 230 ℃.
Example 7: the pretreatment process comprises the following steps: the conductivity of the No. 1 alkaline washing tank is 9.8ms/cm, and the free alkali is 4.5; the conductivity of the No. 2 composite oxidation tank is 54ms/cm, and the free alkali is 7.8; the conductivity of the No. 4 composite oxidation tank is 56ms/cm, and the free alkali is 7.5(2 ml); the chemical coating bath had a chromium point of 18(10ml) and an electrical conductivity of 7.5 ms/cm. The first primer coating production method comprises the following steps: the kinematic viscosity of the front coating is 128cts, the roller speed of a coating roller is 98m/min, the roller speed of a material carrying roller is 48m/min, the pressure between the coating roller and the material carrying roller is 1608kg, and the pressure between the coating roller and the strip steel is 180 kg; the kinematic viscosity of the back coating is 82cts, the roller speed of a coating roller is 98m/min, the roller speed of a material carrying roller is 58m/min, and the pressure between the coating roller and the material carrying roller is 1608 kg; the baking temperature PMT of the priming steel plate is 226 ℃. The production method of the secondary coating intermediate coat and finish coat comprises the following steps: the kinematic viscosity of the intermediate coating is 322cts (35 ℃), the roller speed of the coating roller is 108m/min, the roller speed of the belting roller is 52m/min, the pressure between the coating roller and the belting roller is 1608kg, the pressure between the coating roller and the belting roller is 180kg, and the baking temperature PMT of the intermediate coating steel plate is 228 ℃. The kinematic viscosity of the finish paint is 158cts (35 ℃), the roller speed of a coating roller is 95m/min, the roller speed of a material carrying roller is 62m/min, the pressure between the coating roller and the material carrying roller is 1608kg, and the pressure between the coating roller and the strip steel is 180 kg; the baking temperature PMT of the finish steel plate is 232 ℃.
After production as in the above examples, the color-coated plate was sampled and tested for front film thickness and coating properties. The results are shown in table 4 below, all of which meet the performance requirements and provide excellent levels of coating adhesion.
TABLE 4 color coating Performance test results
The test results show that: the three-coating wide color plate has a front film thickness of more than or equal to 33 mu m, a color difference delta E of less than 1, a glossiness of 25-45, a T bend of less than 4T, a pencil hardness F, an impact property of 9J and MEK wiping resistance of more than or equal to 100 times. The edge of the color plate is well controlled, and the defects of missing coating, coining and the like do not occur, and the surface quality and various coating performances of the wide plate surface meet the requirements.
The invention can be suitable for the production of three-coating wide color-coated plates with the width of more than 1500 mm.
Although the present invention has been described herein with reference to the illustrated embodiments thereof, which are intended to be preferred embodiments of the present invention, it is to be understood that the invention is not limited thereto, and that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure.
Claims (6)
1. A production method of a three-coating wide color-coated plate is characterized by comprising the following steps:
the coating structure 3/1, upper surface three scribbles three dries by fire, and the back is one scribbles, is applicable to large-scale two and scribbles two colored coating production units that dry by fire, specifically includes the following step:
before production, cleaning the whole-line roller system, including a turning roller and a supporting roller of a coating machine, so as to avoid the influence of foreign matters on the roller surface on the quality of the edge of the wide-width plate;
using 1-2 rolls of steel as a front guide, observing the state of a plate surface, and carrying out formal production after confirming that the surface has no defects such as impression and the like;
the production line speed of the machine set is 80m/min, the coating is carried out in two times, the coating is carried out on a primary coating machine for the first time, the priming paint on the upper surface and the priming paint on the lower surface are coated, and the baking and the cooling are carried out; and after coating, cleaning the primer plate on the upper surface, replacing the floating coat, pouring the steel coil to an inlet, closing the cleaning section and the pretreatment section, coating the floating coat and the finish coat for the second time, preparing the finish coat paint in a finish coater, and baking and cooling after coating.
2. The method of producing a three-coat wide color-coated sheet according to claim 1, wherein:
the film thickness distribution proportion is as follows: back primer: 5-7 μm, 5-7 μm front primer, 18-20 μm front middle paint and 8-10 μm front finish.
3. The method of producing a three-coat wide color-coated sheet according to claim 1, wherein:
the pretreatment process comprises primary alkali washing, primary composite oxidation, primary hot water rinsing, secondary composite oxidation, secondary hot water rinsing, tertiary hot water rinsing and chemical treatment; the conductivity of the No. 1 alkaline washing tank is 10 +/-1 ms/cm, the free alkali is 3.5-5.0 points and 10ml, the conductivity of the No. 2 composite oxidation tank is 50 +/-5 ms/cm, the free alkali is 5.0-8.0 points and 2ml, the conductivity of the No. 4 composite oxidation tank is 55 +/-5 ms/cm, and the free alkali is 5.0-8.0 points and 2 ml; and (3) passivating the strip steel by a chemical coating tank in a two-roller reverse coating mode, wherein the chromium point of the chemical coating tank is 15-30 points, 10ml, and the conductivity is 7 +/-1 ms/cm.
4. The method of producing a three-coat wide color-coated sheet according to claim 1, wherein:
the first coating process: priming paint on the front side and the back side; adopting two-roller reverse coating, wherein the kinematic viscosity of the coating at 35 ℃ is 130 +/-5 cts for front primer, and 80 +/-5 cts for back primer; coating priming paint on the upper surface and the lower surface of the coating on a primary coating machine; the specific process for controlling the roll speed and pressure to ensure the surface quality of the edge of the wide board is shown in table 1 below;
TABLE 1 control of the first primer application Process
5. The method of producing a three-coat wide color-coated sheet according to claim 1, wherein:
and (3) a second coating process: intermediate paint and finish paint; pouring the steel coil subjected to the first coating process to an inlet, simultaneously cleaning an upper surface primer plate, replacing intermediate painting, and preparing finish paint on a fine painting plate; cleaning the foreign matters such as the board adhesive tape and the like, and closing the cleaning section and the chemical coating section; setting the kinematic viscosity of the middle coating at 35 ℃ to be 320 +/-5 cts, and setting the kinematic viscosity of the finish coating to be 150 +/-5 cts; in order to ensure the surface quality of the edge of the wide plate, the roll speed and the pressure are controlled, and the specific process is shown in the following table 2;
TABLE 2 control chart of the production method of the second coating of the middle and top paints
6. The method of producing a three-coat wide color-coated sheet according to claim 1, wherein:
baking; the invention adopts a one-stage furnace temperature baking mode, has simple operation and avoids unstable product quality caused by complex production method; the specific process is shown in the following table 3; cooling the strip steel by adopting a water cooling tower with an internal and external circulating system, wherein the water cooling temperature is less than or equal to 45 ℃;
TABLE 3 baking Process parameters
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115011186A (en) * | 2022-06-20 | 2022-09-06 | 马鞍山钢铁股份有限公司 | Environment-friendly passivation primer with high corrosion resistance and excellent adhesive force, preparation method thereof, environment-friendly economical building color-coated plate and production method thereof |
| CN115445889A (en) * | 2022-09-19 | 2022-12-09 | 山东新美达科技材料有限公司 | Preparation method of color coated steel plate with ultrahigh film thickness |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101811114A (en) * | 2009-02-25 | 2010-08-25 | 宝山钢铁股份有限公司 | Production technique of three-coat color-coated steel plate |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101811114A (en) * | 2009-02-25 | 2010-08-25 | 宝山钢铁股份有限公司 | Production technique of three-coat color-coated steel plate |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115011186A (en) * | 2022-06-20 | 2022-09-06 | 马鞍山钢铁股份有限公司 | Environment-friendly passivation primer with high corrosion resistance and excellent adhesive force, preparation method thereof, environment-friendly economical building color-coated plate and production method thereof |
| CN115445889A (en) * | 2022-09-19 | 2022-12-09 | 山东新美达科技材料有限公司 | Preparation method of color coated steel plate with ultrahigh film thickness |
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