GB/T 5237.4-2017Wrought aluminium alloy extruded profiles for architecture - Part 4: Powder 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 Types of membrane layers and characteristics of membrane layers The type of film layer and the characteristics of the film layer are shown in Table 1. Table

1 Types and characteristics of the film layer Film type film layer code a film characteristics Polyester powder coating GA

40 The film layer is sprayed and solidified by a powder coating of saturated carboxylated polyester as a main component, which has good corrosion protection. Performance and weather resistance Polyurethane powder coating GU

40 The film layer is spray-cured from a powder coating of saturated hydroxy polyester as a main component, and has high wear resistance. Can, and the film is smooth, fine texture. For thermal transfer, ink permeability is superior to polyester film Fluorocarbon powder coating GF

40 The film layer is sprayed and cured by a powder coating of thermosetting FEVE resin as the main component, or by thermoplastic The PVDF resin is formed by spraying a powder coating of the main component. Has better weather resistance, Suitable for environments with severe corrosive atmospheres and strong solar radiation Other powder coatings GO

40 See YS/T 680-2016 a The first English letter in the film code indicates dusting; the second English letter indicates powder type, where A indicates polyester powder, U table The polyurethane powder is shown, F is a fluorocarbon powder, and O is another powder; the Arabic numerals following the letters indicate the minimum local film thickness limit.

4.1.3 Film appearance effect The appearance of the film layer is shown in Table 2. Table

2 Film appearance effect Membrane appearance effect note The flat effect has a variety of glossy layers of low light, flat light and high light. The surface of the film is smooth and rich in color. Table 2 (continued) Membrane appearance effect note Texture effect Sand grain The surface of the film has a three-dimensional effect. Suitable for most aluminum door and window profiles, the film gloss should not be less than 5 gloss unit. It is difficult to guarantee the film performance when the film gloss is lower than 5. Wood grain Including heat transfer wood grain and double-spray wood grain, it has the appearance of wood texture. Thermal transfer wood grain layer currently It is mainly suitable for environments with low pollution and weak UV radiation and indoors. When applied outdoors, it should pay more attention to powder. Strict control of quality, ink quality and process. Double-spray wood grain has a three-dimensional effect and can be applied outdoors Hammer, wrinkles, Dali Stone pattern, three-dimensional color carving The surface of the film presents a variety of good three-dimensional or artistic effects. However, the weather resistance and acid and alkali resistance of this type of film are slightly Poor, currently used mainly indoors Metal effect The surface of the film highlights the effect of metallic texture or metallic flicker. However, the variety and dosage of pigments have certain limitations. Sex, the film of aluminum pigment is slightly alkaline

4.1.4 Membrane performance level and applicable environment of corresponding profiles The performance level of the film layer is divided into I grade, II grade and III grade according to the test results of accelerated weather resistance. The performance level of the film shall be agreed between the supplier and the buyer, and In the order form (or contract), if it is not specified, it will be supplied in Class I. See Table 3 for the applicable environment of the film performance level corresponding to the profile. Table

3 Applicable environment of the film performance level corresponding to the profile Film performance level profile applicable environment Class III excellent weather resistance for environments with strong solar radiation Class II good weatherability, suitable for environments with strong solar radiation Class I general weather resistance, suitable for general solar radiation intensity environment

4.1.5 Tags and examples Profile marking by product name, this part number, grade, status, section code and length, color (or color number), film performance level, film The order of the layer code is represented. Examples of tags are as follows: 6063 grade, T5 state, section code is 421001, length of 6000mm, 3003 color, grade I film performance, film code GU40 powder Profile, marked as. Dusting profile GB/T 5237.4-6063T5-421001×6000 color 3003I grade GU40

4.2 Quality Assurance

4.2.1 Process Process assurance see A.1.

4.2.2 Raw materials Refer to A.2 for substrate quality, pretreatment reagents and powder coating quality.

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 local thickness of the film on the decorative surface shall be not less than 40 µm, and the average film thickness shall be controlled between 60 µm and 120 µm. Due to the profile The complexity of the cross-sectional shape makes it possible to have a film thickness of certain surfaces (such as internal corners, grooves, etc.) below the specified value. Have a film thickness When he special requirements, it can be agreed between the supplier and the buyer and stated in the order form (or contract).

Note. When the film thickness is too thick, the film flexibility will be reduced.

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 and tolerance of the film shall comply with the requirements of Table 4. Table

4 Gloss value and allowable deviation unit is gloss unit Gloss value range gloss value allowable deviation 3~30 ±5 31~70 ±7 71~100 ±10

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 DeltaEab* <= 1.5, the color difference DeltaEab* <=

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

4.6.4 Indentation hardness According to the indentation hardness test, the film indentation resistance should be not less than 80.

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 and wrinkling, but it is allowed to see the very small gas which is visible and extremely dispersed. The bubble exists and the adhesion should reach level 0.

4.6.7 Impact resistance

4.6.7.1 After the impact test, the test layer of the grade I film properties shall have no cracking or shedding.

4.6.7.2 Grade II film properties and grade III film properties The test film layer is allowed to have a slight crack after the impact test, but the adhesion is used. Adhesive tape larger than 10N/25mm 1) When further inspection, the surface of the film layer should be free from sticking. 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.

Note. The anodized pretreated powder coating is not suitable for impact resistance testing.

4.6.8 Anti-cupping

4.6.8.1 After the cupping test, the test film layer of the grade I film properties shall be free from cracking or falling off;

4.6.8.2 Grade II film properties and grade III film properties The test film layer is allowed to crack slightly after the cupping test, but with adhesion When the adhesive tape with a force greater than 10N/25mm is further inspected, the surface of the film layer should be free from sticking.

Note. The anodized pretreated spray film layer is not suitable for the anti-cupping performance test.

4.6.9 Resistance to bending

4.6.9.1 The test layer of the grade I film properties shall be free from cracking or peeling after the bending test;

4.6.9.2 Grade II film properties and grade III film properties The test film layer is allowed to have a slight crack after the bending resistance test, but the adhesion is applied. When the adhesive tape with a force greater than 10N/25mm is further inspected, the surface of the film layer should be free from sticking.

Note. The anodized pretreated powder coating is not suitable for bending resistance testing.

4.6.10 wear resistance After the falling sand test, the wear coefficient should be not less than 0.8L/µm.

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

4.6.12 mortar resistance After the mortar resistance test, the surface of the film layer should not fall off or other obvious changes.

4.6.13 Solvent resistance The result of the solvent resistance test of the film layer is preferably 3 or 4 grades.

4.6.14 detergent resistance After the detergent resistance test, there should be no blistering, shedding or other obvious changes on the surface of the film.

4.6.15 Salt spray corrosion resistance After the salt spray corrosion test, the unilateral penetration corrosion width under the film on both sides of the scribe line shall not exceed 4 mm, and the portions on the sides of the scribe line 4 mm apart There should be no blistering, shedding or other significant changes in the surface of the film.

4.6.16 resistance to filiformity When the demand side has requirements for resistance to filamentous corrosion, it shall be agreed between the supplier and the buyer and specified in the order form (or contract). Membrane layer resistant to filiform corrosion The filamentary corrosion coefficient fS after the test should not be greater than 0.3, and the length of the corrosion wire should not be greater than 2 mm.

4.6.17 Heat and humidity resistance After the heat and humidity resistance test, the comprehensive damage level of the surface of the film layer should reach Grade 1.

4.6.18 Weather resistance

4.6.18.1 Accelerated weatherability The accelerated weathering performance of the film shall comply with the requirements in Table 5. Table

5 Accelerated weather resistance Film performance level Accelerated weatherability Test time h test results Gloss retention rate a color difference Class III 4000 >=75% DeltaEab*<=

3 Class II 1000 >=90% DeltaEab* should not be larger than YS/T 680-2016 50% of the value specified in Appendix D Class I 1000 >=50% DeltaEab* should not be larger than YS/T 680-2016 The values specified in Appendix D a Gloss retention is the percentage of the gloss value after the film test relative to its pre-test gloss value.

4.6.18.2 Natural weatherability When the demander has requirements for natural weatherability, it is advisable to select the corresponding natural weatherability level according to Table 6 and agree on the test conditions, and order Indicated in the order (or contract). Table

6 Natural weather resistance test results Natural weather resistance grade test time a Natural weathering test results Gloss retention rate Class III 5 years >= 50% DeltaEab* should not be greater than the value specified in YS/T 680-2016 Appendix D Class II 3 years >= 50% DeltaEab* should not be greater than the value specified in YS/T 680-2016 Appendix D Class I 1 year >= 50% DeltaEab* should not be greater than the value specified in YS/T 680-2016 Appendix D a Different test times can be set for different atmospheric corrosion test stations, but not less than the time specified in the table.

4.6.19 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 should be smooth and uniform, allowing slight orange peeling, and no wrinkles, flow marks, bubbling, cracks, etc. are allowed. Defects used.

5.4 Film properties

5.4.1 Film thickness The method for detecting the thickness of the film layer is carried out in accordance with the provisions of GB/T 4957.

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

5.4.3 Color difference The measurement of chromatic aberration is usually carried out by visual inspection and instrumental method, and the visual method is carried out in accordance with the provisions of GB/T 9761. Instrument method The provisions of GB/T 11186.2 and GB/T 11186.3 are carried out. The monochromatic film arbitration test uses an instrument method.

5.4.4 Indentation hardness According to the provisions of GB/T 9275.

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 2mm. 5.4.5.1.2 Cover the film on the cross-cut film with an adhesive tape with an adhesion greater than 10N/25mm, 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 acc...