This standard specifies the technical requirements, test methods, inspection rules, as well as marking, packaging, transportation and storage of powder electrostatic spray coatings for steel doors and windows. This standard applies to the coating of thermosetting powder coatings for building steel doors and windows. JG/T 3045.2-1998 Technical conditions for powder electrostatic spray coatings for steel doors and windows JG/T3045.2-1998 Standard download decompression password: www.bzxz.net
This standard specifies the technical requirements, test methods, inspection rules, as well as marking, packaging, transportation and storage of powder electrostatic spray coatings for steel doors and windows. This standard applies to the coating of thermosetting powder coatings for building steel doors and windows.

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Construction Industry Standard of the People's Republic of China JG/T3045.2—1998
Technical Conditions of Franklinism Powder Spraying Coating for Steel Doors and SachesConstruction Standard
Published on February 9, 1998
Implementation on June 1, 1998
Ministry of Construction of the People's Republic of China
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JG/T3045.2—1998
This standard is formulated based on the Guidelines for Standardization Work GB/T1.1-1993 and GB/T1.31997, citing relevant national standards and combining the product's own characteristics. During the formulation of this standard, the Japanese standard JIS K5980-1986 "Baking paint film on metal base materials" and the British standard BS6497-1984 "British standard specification for powder organic coatings applied to hot-dip galvanized hot-rolled steel profiles and prefabricated steel sheets for windows and related buildings and baked and for galvanized steel profiles and prefabricated steel sheets coated with powder organic coatings as a final finish" were adopted in a non-equivalent manner.
This standard was proposed by the Standard and Quota Research Institute of the Ministry of Construction. This standard is under the jurisdiction of the China Building Standard Design Institute, the technical coordination unit for building products and equipment standards of the Ministry of Construction.
The initiators of this standard are: Zhejiang Provincial Architectural Science and Design Institute, China Building Metal Structure Association, Zhuji Aluminum Alloy Steel Door and Window Factory, Deqing Mingquan Electrostatic Equipment Manufacturing Company, Huangshan Huajia Chemical Co., Ltd.
The main drafters of this standard are: Cen Rujun, Yan Leiguang, Zhang Baokang, Si Guoguang, Huang Liming, Chen Yanzong.
This standard is entrusted to Zhejiang Academy of Building Science for interpretation. Engineering Construction Standard Full Text Information System
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Construction Industry Standard of the People's Republic of China Technical Conditions for Electrostatic Powder Spraying Coating for Steel Doors and Saches JG/T3045.2—1998
Specification of franklinism powder spraying coating for steel doors and saches Scope
This standard specifies the technical requirements, test methods, inspection rules, and marking, packaging, transportation, and storage of electrostatic powder spraying coatings for steel doors and saches. This standard applies to the coating of thermosetting powder coatings for building steel doors and windows. 2
Cited Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB175-92 Portland cement, ordinary Portland cement GB178-77 Standard sand for cement strength test GB1740-79 Determination of moisture and heat resistance of paint film
GB1764-79 Determination of paint film thickness
GB/T1766-1995 Rating method for aging of paints and varnishes GB/T1771-91 Determination of neutral salt spray resistance of paints and varnishes GB/T1865-1997 Weathering and soil radiation exposure (filtered xenon arc radiation) of paints and varnishes
Approved by the Ministry of Construction of the People's Republic of China on February 9, 1998
Implemented on June 1, 1998
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GB 5827.1—86
Inspection rules for solid steel windows
GB5827.2—86
6Inspection rules for hollow steel windows
GB/T6739—1996Coating hardness pencil test methodGB8486—87
Inspection rules for hollow steel screen doors and windows
GB9155-88Hollow steel doors
GB9156—88
GB9157—88
Solid steel doors
Solid steel screen doors and windows
GB9271-88
Standard test panels for paints and varnishes
GB9286-88
JC/T 481—92
3 Technical requirements
3.1 General requirements
Scratching test of paint and varnish film
Building slaked lime powder
3.1.1 Before electrostatic powder spraying, steel doors and windows should meet the requirements specified in technical documents such as GB5827.1, GB5827.2, GB8486, GB9155, GB9156, GB9157, etc. 3.1.2
Before electrostatic powder spraying, oil, rust, scale and other impurities on the surface of steel doors and windows should be removed, and no cleaning liquid or other impurities that affect the quality of the coating should remain. 3.1.3
After surface treatment, steel doors and windows should be electrostatically sprayed with powder within 24 hours. Steel doors and windows exposed to sunlight should use thermosetting pure polyester powder coating or acrylic powder coating with excellent weather resistance. 3.2 Appearance of coating
3.2.1 The coating appearance of steel doors and windows should be flat and smooth3.2.2
The coating of steel doors and windows with any of the following conditions is an allowable defect: a) Slight orange peel;
p) Inconspicuous pinholes and shrinkage holes;
c) Inconspicuous color difference.
3.2.3 The coating of steel doors and windows with any of the following conditions is an allowable defect: a) Severe orange peel;
b) Obvious pinholes and shrinkage holes;
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c) Severe color difference;
d) Important surface exposed or scratched;
e) Bubbling;
f) Partial shedding.
3.3 Color of coating
The color of the coating of steel doors and windows shall be basically consistent with the selected sample or color plate. 3.4 Thickness of coating
The average thickness of the coating on the decorative surface shall not be less than 60μm, and the minimum point shall not be less than 40μm.
Hardness of coating
The hardness of coating shall not be less than H. www.bzxz.net
3.6 Cross-cut test of coating
The cross-cut test of coating shall reach level 0 in the inspection result classification table in GB9286-88.
Moisture and heat resistance of coating after removal
The moisture and heat resistance of coating shall be level 1 of the evaluation grade in GB1740-79. Mortar resistance of coating
There shall be no phenomenon of coating detachment and coating change due to the influence of mortar and removal of mortar.
3.9 Salt spray resistance of coating
Except for the range within 2.0mm of the scribe line, the coating shall not fall off from the surface. 3.10, Permeability resistance of coating
The coating shall not bubble beyond 3mm from the edge of the test panel. 3.11 Weather resistance of coating
The weather resistance of the remaining layer shall be in accordance with the rating method of GB/T1766-1995, and the single item rating is: 1 for loss of gloss, 1 for discoloration, 0 for powdering; or in accordance with the provisions of Table 13 of GB/T1766-1995, the comprehensive rating is "good" 3
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4 Test method
4.1 Test panel Preparation
The test plate adopts a steel plate with a size of 120mm×60mm×(0.3~1.0)mm, and its surface treatment is carried out according to the provisions of GB9271. Then, a coating is formed on the test plate under the same process conditions as the coating of the workpiece to be tested, and a test plate with a coating thickness of 60μm±20μm is selected for testing
Use normal or corrected vision, under natural scattered light, with the eyes at a distance of about 30cm and an angle of about 120~140 degrees to check. 4.3
Overlap the test plate with the selected standard color plate by 1/4 of the area, and use normal or corrected vision, under natural scattered light, with the eyes at a distance of about 30cm and an angle of about 120~140 degrees to check.
According to GB1764, 6 points are selected on the important surface of steel doors and windows for measurement. Hardness
Test on the test board according to GB/T6739
Scratching test
Test on the test board according to GB9286, with an interval of 1mm. 4.7 Moisture and heat resistance
Test on the test board according to GB1740, with a time of 480h4.8
Mortar resistance
Mortar paste is made by adding 15g slaked lime in accordance with JC/T481-92, 41g cement in accordance with GB175-92, 244g standard sand in accordance with GB178-77 and sufficient tap water. A layer of mortar paste with a thickness of not less than 2mm is applied to each test plate and placed at a temperature of 38℃±3℃ and a relative humidity of 95%±5% for 24h. After 24h, the mortar paste is wiped off the surface of the test plate by hand, and any residue on it is wiped off with a soft wet cloth, and normal or corrected vision is used for inspection. 4
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4.9 Salt Spray Resistance Test
Draw two cross diagonal lines on the test plate (the scratches are deep to the metal matrix, the diagonal lines do not penetrate the diagonals, and the diagonal endpoints are equidistant from the diagonals), and then test for 480 hours according to the provisions of GB1771. After the test, the corrosion flow should not leave the scratch line 2.0mm, and there should be no trace of corrosion on the rest. Wash the test plate with clean water and dry it at 23℃±2℃, then stick a piece of tape paper with a size of about 25mmX150mm on the cutting area, and then quickly pull it apart in the direction perpendicular to the test plate.
4.10 Permeability of coating
Add distilled water to the pressure cooker, the water depth is 25mm±3mm, partially immerse the test plate in water, make the immersion length at least 25mm, and tighten the pot cover. Heat the pressure cooker until steam gushes out of the valve, and make the internal pressure head 0.1MPa ± 0.01MPa. Continue heating for 2h from the first gust of steam, then cool carefully, take out the test plate and check it immediately.
4.11 Weather resistance of coating
Perform according to GB18651997 for 480h. 5
Inspection rules
Factory inspection
The items for factory inspection are 3.2, 3.3, 3.4, 3.5, 3.6 and 3.7. 5.2 Type inspection
The items for type inspection are 10 items in 3.2~3.11 of this standard. 5.2.1 Type inspection should be carried out in any of the following situations: a) when the first production or production is resumed after suspension for more than half a year; b) after two years of continuous production;
) when the powder coating type is changed or the production process is significantly changed; d) when the factory inspection result is significantly different from the last type inspection; e) when the national quality supervision agency proposes a type inspection requirement. 5.2.2 When conducting type inspection, the weather resistance performance is allowed to be based on the test report provided by the powder coating manufacturer by the national statutory testing unit. 5
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5.3 Sampling Rules
When the batch is less than or equal to 300, the factory inspection should be carried out once for each batch. If the batch is greater than 300, the factory inspection should be increased once for every increase of 500. Sampling quantity: For items tested with steel doors and windows, the sampling quantity for each batch is 2%, but shall not be less than 5 models. For type inspection, the sampling quantity is 6 models. For items tested with test panels, the sampling quantity shall be implemented according to the corresponding standards. If there is no stipulation in the standards, 3 test panels shall be taken for each item in each batch for testing.
5.4 Judgment rules
The coating of plastic-sprayed steel doors and windows must all be qualified according to the test of this standard. When one or more items are unqualified, the unqualified items shall be doubled for inspection. If there is still one unqualified item, the coating of the batch of plastic-sprayed steel doors and windows shall be judged as unqualified. 6
Marking, packaging, transportation, purchase and storage
Add "(Plastic Spraying)" or "(PS)" after the specified steel door and window marking to indicate that the batch of steel doors and windows is a coating electrostatically sprayed with thermosetting powder coating as a protective and decorative layer, and indicate the color of the coating.
Each plastic-sprayed steel door and window shall be packaged separately, and special protective measures shall be used, especially at the corners of the window frame.
6.3 Transportation
Plastic-sprayed steel doors and windows should be wrapped and secured to facilitate transportation; be careful when loading, unloading and handling; collision is strictly prohibited during transportation.
Plastic-sprayed steel doors and windows should be stored or covered with tarpaulins, etc. When stacking, use a heat block to heat and level the fish, the vertical fish angle should not be less than 70°, and avoid contact with corrosive media. 6
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