CN116265131A - Processing method of coated steel - Google Patents

Processing method of coated steel Download PDF

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Publication number
CN116265131A
CN116265131A CN202111542607.9A CN202111542607A CN116265131A CN 116265131 A CN116265131 A CN 116265131A CN 202111542607 A CN202111542607 A CN 202111542607A CN 116265131 A CN116265131 A CN 116265131A
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CN
China
Prior art keywords
coated steel
steel
processing
coating
product according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202111542607.9A
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Chinese (zh)
Inventor
刘海涛
程艳清
白凌云
王迎春
吉志强
庞建新
刘欢
林莉
张志远
范晓红
薛利
王灵艳
张佳琰
张帅
田迎利
姜建召
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Baotou Beifang Chuangye Co Ltd
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Baotou Beifang Chuangye Co Ltd
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Priority to CN202111542607.9A priority Critical patent/CN116265131A/en
Publication of CN116265131A publication Critical patent/CN116265131A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • 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
    • B05D3/007—After-treatment
    • 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
    • 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
    • B05D7/24—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 for applying particular liquids or other fluent materials
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Abstract

The invention discloses a processing method of coated steel, which comprises the following steps: spraying water-based acrylic acid epoxy resin on the surface of clean steel with the surface temperature of 0-15 ℃, and then heating for 3-4 min at 65-80 ℃ to obtain the coated steel; according to GB/T9286-1998, a cross-cut is adopted to detect the coated steel, and the adhesive force of the coating is less than or equal to 1 grade. The processing method of the invention ensures that the adhesive force performance of the coating is good, and is suitable for winter construction.

Description

Processing method of coated steel
Technical Field
The invention relates to a processing method of coated steel.
Background
The treatment agent for coating steel materials generally used contains a large amount of harmful substances such as benzene, toluene, xylene, etc., which are flammable and explosive, have high toxicity and are harmful to the environment and the health of workers. With the development of the technology for producing aqueous treating agents, aqueous treating agents are receiving increasing attention as more environmentally friendly surface treating agents. The water-based treating agent takes water as a solvent, has long surface drying time and is greatly influenced by temperature, and the construction process is different from that of the organic solvent type treating agent.
In addition, the temperature in the factory building in winter is lower and basically maintained at 0 ～ 5 ℃, the surface temperature of the steel is lower than 5 ℃ under the condition of colder external environment in winter, which is unfavorable forThe surface of the aqueous treating agent is dried. Therefore, it is required to ensure that the performance of the steel material after construction by the water-based treating agent is not reduced, the surface drying time of the steel material after construction is short, the steel material is stacked without sticking plates and paint dropping, the daily yield of the steel material coating treatment is not reduced, and the requirement of mass production of the steel material with hundred tons of daily yield can be met. Therefore, different aqueous treating agents need to be matched with proper coating processes to obtain coated steel with excellent performance.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a method for processing a coated steel material such that the adhesion of the coating layer is 1 level or less and is suitable for winter construction. The aim of the invention is realized by the following technical scheme.
The invention provides a processing method of coated steel, which comprises the following steps:
spraying water-based acrylic acid epoxy resin on the surface of clean steel with the surface temperature of 0-15 ℃, and then heating for 3-4 min at 65-80 ℃ to obtain the coated steel; according to GB/T9286-1998, a cross-cut is adopted to detect the coated steel, and the adhesive force of the coating is less than or equal to 1 grade.
According to the invention, a large number of researches and experiments show that the coating formed by spraying the water-based acrylic epoxy resin can ensure that the processed steel has good performance and can meet the actual needs. In the present invention, the aqueous acrylic epoxy resin may be used as known in the art, and is not described herein.
Aiming at the characteristics of lower temperature in a factory building in winter and water-based acrylic epoxy resin, the invention discovers that the adhesive force of a coating can be less than or equal to 1 level by controlling the heating temperature and the heating time, and the surface drying can be fast (the surface drying time is controlled to be less than 6 minutes), so that the processed steel is stacked without sticking plates and paint dropping. Therefore, the method can meet the batch production of about hundred tons of daily yield of steel surface treatment, and achieves the daily yield target of the original production line.
The surface temperature of the clean steel material at the time of spraying may be 0 to 15 ℃, preferably 0 to 10 ℃, more preferably 0 to 5 ℃. Thus, the coating can be favorable for adapting to factory building environments in winter and ensuring good adhesive force performance of the coating.
In the present invention, the heating temperature may be 65 to 80 ℃, preferably 70 to 80 ℃, more preferably 75 to 80 ℃, still more preferably 78 to 80 ℃. The heating time is 3 to 4 minutes, preferably 3 to 3.5 minutes. The resulting coating thickness may be 10 to 20. Mu.m, preferably 12 to 19. Mu.m, more preferably 14 to 19. Mu.m. Thus being beneficial to ensuring that the performance of the processed steel meets the requirements. The surface drying time of the steel in the invention refers to the surface drying time of the clean steel after being sprayed by adopting the water-based acrylic epoxy resin.
According to one embodiment of the present invention, an aqueous acrylic epoxy resin is sprayed on the surface of a clean steel material having a surface temperature of 0 to 10 ℃ and then heated at 75 to 80 ℃ for 3 to 4 minutes to obtain a coated steel material.
According to the method for processing a coated steel product of the present invention, the surface temperature is preferably 0 to 10 ℃. Thus, the method can be better suitable for the factory building environment in winter.
According to the method for processing coated steel of the present invention, the heating temperature is preferably 75 to 80℃and the heating time is preferably 3 to 3.5 minutes. Therefore, the coating can be better suitable for the factory building environment in winter, the adhesive force performance of the obtained coating can be ensured, and the requirement of quick surface drying can be met.
According to the method for processing a coated steel product of the present invention, preferably, high-pressure airless spraying is used for the spraying. Thus, the coating of the steel surface can be realized quickly and uniformly.
In the present invention, spraying can be achieved using a high pressure airless spray gun. The flow rate of the nozzle of the spray gun is 1.3-1.5L/min, and the width of the mist is 150-300 mm.
According to the method for processing a coated steel material of the present invention, it is preferable that the spraying distance is 250 to 400mm.
In the present invention, the spraying distance may be 250 to 400mm, preferably 300 to 400mm. The spraying pressure may be 0.3 to 0.4MPa, preferably 0.3 to 0.35MPa. This can be advantageous to ensure that the thickness and uniformity of the coating are satisfactory.
According to one embodiment of the invention, the spraying distance is 300-400 mm; the spraying pressure is 0.3-0.4 MPa.
According to the method for processing a coated steel product of the present invention, the spraying pressure is preferably 0.3 to 0.4MPa.
According to the process for the production of coated steel according to the invention, the aqueous acrylic epoxy resin preferably has a viscosity of 20 to 40s, measured according to GB/T1723-1993 using a coating-4 viscometer at 18 ℃. Thus, the uniform spraying of the aqueous acrylic epoxy resin can be realized. Those aqueous acrylic epoxy resins known in the art may be used and will not be described in detail herein.
In the present invention, the viscosity of the aqueous acrylic epoxy resin may be 20 to 40 seconds, preferably 20 to 30 seconds, more preferably 20 to 25 seconds. According to a preferred embodiment of the present invention, the aqueous acrylic epoxy resin has a viscosity of 20 to 30 seconds. The viscosity of the invention is measured in seconds(s) according to GB/T1723-1993 coating viscosimetry using a coating-4 viscometer at 18 ℃.
According to the method for processing a coated steel product of the present invention, the aqueous acrylic epoxy resin is preferably used in the form of an aqueous solution, and the solid content of the acrylic epoxy resin in the aqueous solution is 45wt% or more. On one hand, the surface drying time of the steel surface is not more than 6min, the steel is stacked without sticking plates and paint dropping, and on the other hand, the adhesive force performance of the coating is ensured to be good.
In the present invention, the solid content of the acrylic epoxy resin in the aqueous solution is preferably 45wt% or more and less than 90wt%, more preferably 50wt% or more and less than 85wt%.
The method for processing a coated steel material according to the present invention preferably further comprises the steps of:
and (3) performing shot blasting on the surface of the steel so that the cleanliness of the surface of the steel reaches the Sa2.5 level specified in GB/T8923-2011, the rust cleaning reaches the St3 level specified in GB/T8923-2011, and the surface roughness is 30-80 mu m, so that the clean surface of the steel is formed. This is advantageous in ensuring good adhesion properties of the resulting coating.
According to one embodiment of the present invention, the method for processing coated steel comprises the following specific steps:
performing shot blasting and dust blowing treatment on the steel surface to ensure that the surface cleanliness of the steel reaches the Sa2.5 level specified in GB/T8923-2011, the rust cleaning reaches the St3 level specified in GB/T8923-2011, and the surface roughness is 30-80 mu m, so that a clean steel surface is formed;
spraying water-based acrylic acid epoxy resin on the surface of clean steel with the surface temperature of 0-15 ℃, and then heating for 3-4 min at 65-80 ℃ to obtain the coated steel; according to GB/T9286-1998, a cross-cut is adopted to detect the coated steel, and the adhesive force of the coating is less than or equal to 1 grade.
According to the method of processing a coated steel product of the present invention, the coating thickness is preferably 10 to 20 μm. Thus meeting the actual needs.
The coating obtained by the processing method of the coated steel has the adhesive force less than or equal to 1 level, the quality of the coating meets the requirements, the coating is suitable for winter construction, the quick surface drying after coating can be realized, and the requirement of mass production of the coated steel can be met. In addition, the mechanical properties of the welded seam of the processed steel meet the technical requirements of products; the corrosion resistance of the processed steel meets the technical requirements of products.
Detailed Description
The present invention will be further described with reference to specific examples, but the scope of the present invention is not limited thereto.
Example 1
And (3) performing shot blasting on the steel, and performing dust blowing treatment on the surface of the steel to form a clean steel surface. The aqueous acrylic epoxy resin with the viscosity of 20s is sprayed on the surface of clean steel with the surface temperature of 5 ℃ in a high-pressure airless spraying mode under the spraying distance of 300mm and the spraying pressure of 0.3 MPa. And then heating at 80 ℃ for 3min to obtain the coated steel.
And (5) drying the coated steel surface. The thickness of the coating was 15 μm. The coated steel materials are sequentially stacked, and the stacked steel materials are not sticky to plates and paint is not dropped. The adhesion performance test results of the coatings are shown in table 1.
Example 2
The only difference from example 1 is that the surface temperature is 0 ℃.
And (5) drying the coated steel surface. The coated steel materials are sequentially stacked, and the stacked steel materials are not sticky to plates and paint is not dropped. The adhesion performance test results of the coatings are shown in table 1.
Comparative example 1
The only difference from example 1 is that the heating time was 5.5min.
The surface of the coated steel is dry. The coated steel materials are sequentially stacked, and the stacked steel materials are not sticky to plates and paint is not dropped. The adhesion performance test results of the coatings are shown in table 1.
Comparative example 2
The only difference from example 1 is that the heating temperature is 90 ℃.
And (5) drying the coated steel surface. The coated steel materials are sequentially stacked, and the stacked steel materials are not sticky to plates and paint is not dropped. The adhesion performance test results of the coatings are shown in table 1.
Comparative example 3
The only difference from example 1 is that the spraying pressure was 0.55MPa. The thickness of the coating was 25 μm.
The surface part of the coated steel product is not surface-dried, and the dip board and the paint are stacked. The adhesion performance test results of the coatings are shown in table 1.
Comparative example 4
The only difference from example 1 is that the heating temperature is 40 ℃.
The surface part of the coated steel product is not surface-dried, and the coated steel products are sequentially stacked, so that the plate is dipped and the paint is removed. The adhesion performance test results of the coatings are shown in table 1.
Comparative example 5
The only difference from example 1 is that the heating time was 1min.
The surface of the coated steel is dry. The coated steel materials are sequentially stacked, and the stacked steel materials are not sticky to plates and paint is not dropped. The adhesion performance test results of the coatings are shown in table 1.
Comparative examples 6 to 7
The only difference from example 1 is that the aqueous acrylic epoxy resin was replaced with an aqueous epoxy resin and an aqueous acrylic resin, respectively.
The surface of the coated steel is dry. The coated steel materials are sequentially stacked, and the stacked steel materials are not sticky to plates and paint is not dropped. The adhesion performance test results of the coatings are shown in table 2.
The test method of the coated steel product is described below.
1) And (3) adhesive force detection: and (3) after the coated steel products obtained in the examples and the comparative examples are continuously dried for 24 hours, measuring the coating, and conforming to the process requirements when the coating is in the range of 14-19 mu m. According to the related requirements of GB/T9286-1998 'cross-cut test of color paint and varnish film', a cross-cut device (1 mm) is adopted to detect the adhesive force of the coating, and the inspection result is less than or equal to 1 grade and is qualified.
2) Mechanical property test after welding:
according to ISO15614-1 Specification of welding procedure for metallic materials, authentication welding procedure test part 1: the standard of arc welding and gas welding of steel and arc welding of nickel and nickel alloy requires that the weld between the coated steels obtained in the examples be subjected to magnetic powder and X-ray inspection;
detecting the mechanical property of the weld joint according to NB/T47013.4, and judging that the detection result is I grade;
according to GB/T228.1-2010 section 1 Metal Material tensile test: the room temperature test method carries out tensile test detection;
the bending test detection is carried out according to GB/T232-2010 bending test method for metallic materials.
Through performance detection, the quality of the welding seam meets the standard B-level requirement of ISO5817-2014 'quality grade of welding-steel, nickel, titanium and alloy fusion welding joints (excluding electron beam welding) -defects', and the defects such as air holes, slag inclusion, cracks and the like are not found in the welding seam, so that the product requirement is met.
TABLE 1 adhesion Performance test results of coatings
Numbering device Spraying pressure/MPa Surface temperature/. Degree.C Heating temperature/. Degree.C Heating time/min Adhesion test
Example 1 0.3 5 80 3 △
Example 2 0.3 0 80 3 △
Comparative example 1 0.3 5 80 5.5 △△
Comparative example 2 0.3 5 90 3 △△△
Comparative example 3 0.55 5 80 3 △△△
Comparative example 4 0.3 5 40 3 △△
Comparative example 5 0.3 5 80 1 △△
Note that: in Table 1, one "Δ" represents an adhesion test of grade 1 or grade 0, indicating eligibility; more than two "Δ" represent failure in the adhesion test, and more "Δ" represents poorer adhesion performance.
TABLE 2 adhesion Performance test results of coatings
Numbering device Spray raw material Adhesion test
Example 1 Water-based acrylic epoxy resin △
Comparative example 6 Water-based epoxy resin △△
Comparative example 7 Aqueous acrylic resin △△
Note that: the meaning of "Δ" in table 2 is the same as that of "Δ" in table 1.
As can be seen from the comparison between the example 1 and the comparative example 1, too short a drying time can not cause rapid surface drying of the steel surface, and too long a drying time can affect the adhesive force performance of the coating. As can be seen from a comparison of example 1 and comparative example 2, the drying temperature cannot be too high, which would affect the adhesion properties of the coating. As is clear from a comparison of example 1 and comparative example 3, a suitable range of spray pressure is required, and too high spray pressure results in too thick a coating, which affects the adhesion properties of the coating. As can be seen from a comparison of example 1 and comparative example 4, the surface temperature needs to be controlled within a suitable range in order to achieve rapid drying on the one hand and to ensure satisfactory adhesion properties of the coating on the other hand. As is clear from a comparison of example 1 and comparative examples 6 and 7, the adhesion of the aqueous acrylic epoxy resin is superior to other types of aqueous treating agents, and has an important effect on the coating properties.
In summary, the adhesion of the coating obtained by the processing method of the coated steel is detected to be less than or equal to 1 level, the requirement is met, meanwhile, the steel can be quickly dried, the steel is stacked without sticking plates and paint dropping, and the requirement of mass production of hundred tons of steel produced in daily life can be met. In addition, the mechanical properties of the welded seam of the processed steel are qualified.
The present invention is not limited to the above-described embodiments, and any modifications, improvements, substitutions, and the like, which may occur to those skilled in the art, fall within the scope of the present invention without departing from the spirit of the invention.

Claims (10)

1. A processing method of coated steel is characterized by comprising the following steps:
spraying water-based acrylic acid epoxy resin on the surface of clean steel with the surface temperature of 0-15 ℃, and then heating for 3-4 min at 65-80 ℃ to obtain the coated steel; according to GB/T9286-1998, a cross-cut is adopted to detect the coated steel, and the adhesive force of the coating is less than or equal to 1 grade.
2. The method of processing a coated steel product according to claim 1, wherein the surface temperature is 0 to 10 ℃.
3. The method of processing a coated steel product according to claim 2, wherein the heating temperature is 75 to 80 ℃ and the heating time is 3 to 3.5 minutes.
4. The method of claim 1, wherein the spraying is high pressure airless spraying.
5. The method of producing a coated steel product according to claim 4, wherein the spray distance is 250 to 400mm.
6. The method of producing a coated steel product according to claim 5, wherein the spraying pressure is 0.3 to 0.4MPa.
7. The method of processing a coated steel product according to claim 6, wherein the aqueous acrylic epoxy resin has a viscosity of 20 to 40 seconds as measured by a paint-4 viscometer according to GB/T1723-1993 at 18 ℃.
8. The method of processing a coated steel product according to claim 7, wherein the aqueous acrylic epoxy resin is used in the form of an aqueous solution, and the solid content of the acrylic epoxy resin in the aqueous solution is 45wt% or more.
9. The method of processing a coated steel product according to any one of claims 1 to 8, further comprising the steps of:
and (3) performing shot blasting on the surface of the steel so that the cleanliness of the surface of the steel reaches the Sa2.5 level specified in GB/T8923-2011, the rust cleaning reaches the St3 level specified in GB/T8923-2011, and the surface roughness is 30-80 mu m, so that the clean surface of the steel is formed.
10. The method of processing a coated steel product according to claim 9, wherein the coating thickness is 10 to 20 μm.
CN202111542607.9A 2021-12-16 2021-12-16 Processing method of coated steel Pending CN116265131A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111542607.9A CN116265131A (en) 2021-12-16 2021-12-16 Processing method of coated steel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111542607.9A CN116265131A (en) 2021-12-16 2021-12-16 Processing method of coated steel

Publications (1)

Publication Number Publication Date
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Country Status (1)

Country Link
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Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
刘薇薇: "《电泳涂装百科全书》", 中国建筑工业出版社, pages: 288 - 293 *
孙世强等: "工程机械传动部件水性漆涂装试验研究", 中国设备工程, pages 105 - 106 *
苗帅等: "水性漆在柴油机涂装上的应用", 内燃机与动力装置, vol. 35, no. 6, pages 59 - 63 *
董建峰;: "铁路货车用水性漆涂装工艺", 现代涂料与涂装, no. 01, pages 43 - 45 *

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