GB/T 5237.5-2017Wrought aluminium alloy extruded profiles for architecture - Part 5: Paint coating profiles (English PDF)

4.1 Product Classification

4.1.1 Grade, Status and Size Specifications The grade, condition and size specifications shall comply with the provisions of GB/T 5237.l.

4.1.2 Type of film layer, film layer code, film layer composition, film layer characteristics and applicable environment of corresponding profiles The type of film layer, film layer code, film layer composition, film layer characteristics and applicable environment of the corresponding profiles are shown in Table 1. Table

1 Type of film layer, film layer code, film layer composition, film layer characteristics and applicable environment of corresponding profiles Membrane type film layer code a film layer composition characteristics and corresponding environment of the corresponding profile Two coat LF2-25 primer plus topcoat The second coating is generally a monochromatic or pearlescent mica scintillation effect film layer, which is not required Additional varnish protection. The second coating is suitable for solar radiation and the atmosphere Corrosive environment Three-coat LF3-34 primer, topcoat and varnish The three-coating is generally a metallic effect film in which the ball is used in the paint. Grinding aluminum powder to obtain metal texture effect, the metal texture is different from the second coating The layer of pearlescent mica film, because the aluminum powder is easy to oxidize or peel off, the surface of the film Varnish protection is required to ensure the overall performance of the film. Metallic aluminum paint Generally do not make two coatings. Three coatings are suitable for strong solar radiation and atmosphere Corrosive environment Four coat LF4-55 primer, barrier paint, top coat and varnish The four-coat layer is generally a metal effect film layer with higher performance requirements, and the film layer On the basis of the three-coat layer, a barrier film layer that blocks ultraviolet rays is added, Improved UV resistance. The four coatings are suitable for strong solar radiation, Extremely corrosive atmosphere

Note. The film characteristics, coating characteristics and requirements of primer, barrier paint, topcoat and varnish are shown in Table A.2. a "LF" in the film designation indicates painting treatment, the first Arabic digit after "LF" indicates the type of film layer, and the Arabic number after "-" indicates the film layer. The minimum local film thickness.

4.1.3 Tags and examples Profile marking by product name, this part number, grade, status, section code and length, color (or color number), film order Show. Examples of tags are as follows: Example 1. The paint color is 2345, the film type is four coat, 6063 grade, T5 state, the cross-section code is YST10002, the length is 4000mm, the paint profile, the standard Recorded as. Painting profile GB/T 5237.5-6063T5-YST10002×4000 color 2345LF4-

55 Example 2. The paint color is red, the film type is two coat, 6063 grade, T5 state, the cross-section code is YST10002, the length is 4000mm, the paint profile, the standard Recorded as. Painting profile GB/T 5237.5-6063T5-YST10002×4000 red LF2-25

4.2 Quality Assurance

4.2.1 Process Process assurance see A.1.

4.2.2 Raw materials Refer to A.2 for the quality of the substrate, pretreatment reagents and fluorocarbon paint.

4.3 Chemical composition The chemical composition should meet the requirements of GB/T 5237.1.

4.4 Mechanical properties Mechanical properties should meet the requirements of GB/T 5237.1.

4.5 Dimensional deviation After the profile is removed, the dimensional deviation shall comply with the provisions of GB/T 5237.1. Dimensional changes caused by the film layer should not affect its Assembly and use.

4.6.1 Film thickness

4.6.1.1 The film thickness on the decorative surface shall comply with the requirements of Table 2. Table 2 film thickness Membrane type Average film thickness Mm Local film thickness a Mm Two coats >= 30 >=

25 Three coatings >=40 >=

34 Four coatings >=65 >=55 a Due to the complexity of the cross-sectional shape of the profile, the local film thickness on some surfaces of the profile (such as internal corners, grooves, etc.) is allowed to be lower than the values specified in Table 2, but not allowed There is a phenomenon of exposure.

4.6.1.2 If the non-decorative surface requires film thickness, it shall be agreed between the supplier and the buyer and specified in the order form (or contract).

4.6.2 Gloss The gloss value of the film shall be in accordance with the order form (or contract), with an allowable deviation of ±5 gloss units.

4.6.3 Color difference The color of the film should be basically the same as the model agreed between the supplier and the buyer. The color difference between the monochromatic film and the sample when measured by the instrument method DeltaE*ab<=1.5, the color difference DeltaE*ab<=

1.5 between the profiles of the same batch (referred to as the delivery batch).

4.6.4 Hardness After the pencil scratch test, the hardness of the film layer should be not less than 1H.

4.6.5 Adhesion The dry adhesion, wet adhesion and boiling water adhesion of the film layer should reach level 0.

4.6.6 Resistance to boiling water After the high-pressure water immersion test, the surface of the film layer should be free from falling off, wrinkling, foaming, loss of light, discoloration, etc., and the adhesion should reach 0.

4.6.7 Impact resistance After the impact resistance test, the film layer is allowed to have micro cracks, but a sticky film layer is not allowed on the adhesive tape.

4.6.8 Abrasion resistance After the falling sand test, the wear coefficient should be not less than 1.6L/µm.

4.6.9 Hydrochloric acid resistance After the hydrochloric acid resistance test, there should be no bubbles or other significant changes on the surface of the film.

4.6.10 Resistance to nitric acid After the nitric acid resistance test, the color difference value DeltaE*ab <=

4.6.16 Weather resistance

4.6.16.1 Accelerated weatherability After the accelerated weathering test, the gloss retention of the film layer (the gloss value after the film layer test is relative to the gloss value before the test) The ratio should be not less than 75%, the color difference value DeltaE*ab<=3.0, and the chalking level reaches 0 level.

4.6.16.2 Natural weatherability When the demand side has requirements for natural weatherability, it shall be agreed between the supplier and the buyer, and shall be indicated in the order form (or contract), and the film shall be naturally resistant for 10 years. Membrane gloss retention rate after the test (can be set for different atmospheric corrosion test stations, but not less than 10 years) (The percentage of the gloss value after the film test is relative to the gloss value before the test) should be not less than 50%; the color difference value DeltaE*ab<=5.0; film thickness loss The rate should be no more than 10%.

4.6.17 Other When the demand side has requirements for other performances, the supplier and the buyer shall refer to GB/T 8013.3 for specific agreement and indicate in the order form (or contract).

4.7 Appearance quality The film on the decorative surface of the profile shall be smooth and uniform, and no flow marks, wrinkles, bubbles, shedding and other defects affecting the use shall be permitted.

5.4 Film properties

5.4.1 Film thickness According to the provisions of GB/T 4957, the average value of the five partial film thicknesses is recorded as the average film thickness of the film layer to be tested.

5.4.2 Gloss According to the provisions of GB/T 9754, measured by 60° angle of incidence.

5.4.3 Color difference

5.4.3.1 Visual measurement According to the provisions of GB/T 9761.

5.4.3.2 Instrumental assay The arbitration test uses a color difference meter and is carried out in accordance with the provisions of GB/T 11186.2 and GB/T 11186.3.

5.4.4 Hardness The pencil hardness test was carried out according to GB/T 6739, and the test results were evaluated according to the scratch of the surface film layer.

5.4.5 Adhesion

5.4.5.1 Dry adhesion 5.4.5.1.1 According to the provisions of GB/T 9286, the cross-cut spacing is 1mm. 5.4.5.1.2 Cover the adhesive tape 1) with an adhesive force greater than 10N/25mm on the cross-cut film layer, and press it to remove the air under the adhesive tape. The adhesive tape is quickly pulled up at an angle perpendicular to the surface of the film and rated according to the provisions of GB/T 9286. 1) Scotch 610 adhesive tape or Permacel 99 adhesive tape is an example of a suitable commercial product. This information is given to facilitate the use of this section. It does not imply endorsement of these products.

5.4.5.2 Wet adhesion After the sample is cut according to the provisions of 5.4.5.1.1, it is placed in 38°C±5°C and immersed in the third grade water specified in GB/T 6682 for 24 hours. The sample was wiped dry and tested and rated according to 5.4.5.1.2 within 5 min.

5.4.5.3 Boiling water adhesion 5.4.5.3.1 Cut the specimen according to the provisions of 5.4.5.1.1. 5.4.5.3.2 Inject the third-grade water specified in GB/T 6682 into the beaker to a depth of about 80mm, and put 2~3 pieces of clean broken in the beaker. Porcelain piece. Heat at the bottom of the beaker until the water boils. 5.4.5.3.3 Suspend the sample in boiling water for 20 minutes. The sample should be below 10mm on the water surface, but should not touch the bottom of the container. In trial Keep the water temperature not lower than 95 °C during the process, and add the third grade water specified in GB/T 6682 to the cup at any time to keep the water level high. Less than 80mm. 5.4.5.3.4 Remove and dry the sample and test and rate it according to 5.4.5.1.2 within 5 minutes.

5.4.6 boiling water resistance Inject three levels of water specified in GB/T 6682 to a depth of about 80 mm in a pressure cooker, and place a sample of about 50 mm length vertically in water. Medium, the sample should be below 10mm on the water surface, but can not touch the bottom of the container, heated to a pressure of 0.1MPa ± 0.01MPa, and maintain a constant pressure After 1 h, the sample was taken out and dried, and the surface layer change after the test was visually inspected, and the sample was taken within

5.4.5.1 within 5 min. Adhesion test and rating.

5.4.7 Impact resistance

5.4.7.1 Preparation of standard test panels. select pure aluminum plates with a size of 150mm × 75mm × 1.0mm and the state is H24 or H14, same as the batch The profiles were sprayed and cured on the same line using the same process and then placed for 24 h.

5.4.7.2 Using a punch with a diameter of 16mm ± 0.3mm, carry out the impact test according to the method specified in GB/T 1732. the hammer (1000g±5g) directly placed on the surface of the film (positive punch) directly impacting the standard test plate at a suitable height, and the punching depth is 2.5mm± 0.3mm pit, immediately cover the surface of the film after the impact test with adhesive tape with adhesive force greater than 10N/25mm, press tightly to row Remove the air under the adhesive tape, and then quickly pull up the adhesive tape at an angle perpendicular to the surface of the film to visually observe the change of the film in the pit and the periphery. Happening.

5.4.8 Wear resistance The falling sand test shall be carried out in accordance with the provisions of GB/T 8013.3. The abrasive shall comply with the standard sand specified in GB/T 17671.

5.4.9 Hydrochloric acid resistance The hydrochloric acid test solution (1 9) was prepared by analyzing pure hydrochloric acid (rho=

1.19 g/mL) and the tertiary water specified in GB/T 6682. In the sample 10 drops of hydrochloric acid test solution was dripped on the surface of the film, covered with a watch glass, placed in an environment of 18 ° C ~ 27 ° C for 15 min, and then used Wash and dry. The surface of the film after the test was visually inspected.

5.4.10 Resistance to nitric acid Inject 100 mL of analytically pure nitric acid (rho=

1.40 g/mL) into a.200 mL jar and place the sample membrane layer down on the bottle mouth. On the upper side, the sample was taken off after 30 minutes, rinsed with tap water and dried, and the surface of the film after the test was checked after being placed for 1 hour. Test at temperature The degree is from 18 ° C to 27 ° C and the humidity is less than 50%.

5.4.11 Mortar resistance

5.4.11.1 Take 75g of construction lime specified in JC/T 479 and 225g of construction sand speci...