Coating film performance testing is an important part of coating testing. The test results of the coating film basically reflect the quality level of the product and its function level. The content of coating film performance testing mainly includes four aspects: ① testing of basic physical properties, including appearance and optical properties, mechanical properties and application properties (such as recoatability, sanding etc.); Performance detection, such as the detection of resistance ③ chemical corrosion resistance detection, mainly to check the resistance of the coating film to various chemicals and anti-corrosion (rust) performance ; ④ durability testing. These testing items are mainly carried out on the coating film applied to the substrate . Coating film testing is usually carried out under standard conditions. Although we try our best to imitate the conditions during construction, the results are still different. Maybe the test results of coating film performance are good, but they are not People should study to find out the reason, and adopt a detection method . See Table 9-11 for the general inspection and quality evaluation standards of coating film performance.
| performance | Test method standard | Evaluation method standard | illustrate |
| luster | GB/T 9754 " Determination of 20°, 60 ° and 85 ° specular gloss of paint films of paints and varnishes without metallic pigments" | GB/T 9754 " Determination of 20°, 60 ° and 85 ° specular gloss of paint films of paints and varnishes without metallic pigments" | 20 ° method for high gloss 85° method for low gloss |
| hardness | GB /T 1730 "Paint Film Hardness Determination Method Pendulum Resistance Test" GB /T 6/39 "Pencil Test Method for Coating Film Hardness" | GB /T 1730 "Paint Film Hardness Determination Method Pendulum Resistance Test" GB / T 6/39 "Pencil Method for Determination of Coating Film Hardness" | Relative value of paint film and glass hardness Can be manually tested on site, corresponding to pencil hardness |
| Impact resistance | GB /T 1732 "Determination of impact resistance of paint film " | GB/T 1732 "Determination of impact resistance of paint film" | General requirements substrate thickness ≤ 0.5mn |
| flexibility | GB /T 1731 "Determination of flexibility of paint film" GB/T 1748 "Determination of flexibility of putty film " GB/T 11185 "Paint Film Bending Test ( Tapered Shaft)" GB /T 9753 "Cupping test " | GB/T 1731 "Determination of flexibility of paint film " GB /T 1748 "Putty Film Flexibility Determination Method" GB /T 11185 "Paint Film Bending Test ( Tapered Shaft)" GB /T 9753 "Cupping test " | get value discontinuous Can only be used for putty film determination There is continuity Mainly for coating films with post-forming |
| Adhesion | GB/T1720 "Determination of Paint Film Adhesion" GB/T 9286 " Cross-cut test of paint and varnish film" GB/T 5210 "Determination of Delamination Adhesion Pull-off Method" | GB /T1720 "Determination of Adhesion by Detachment " GB /T 9286 " Cross-cut test of paint and varnish film" GB/T 5210 "Determination of Coating Adhesion Pull-off Method" | Generally suitable for ≤25μm coating film Can measure thick film, also can test on site Visualize binding force per unit area |
| water resistance | GB/T 5209 "Determination of water resistance of paints and varnishes by immersion method" GB/T 1733 "Determination of Water Resistance of Paint Films " | GB/T 5209 "Determination of water resistance of paints and varnishes by immersion method" G8/T 1733 "Determination of Water Resistance of Knee Membrane " | 40℃ flowing water, strong acceleration 23℃ method, boiling water method, static immersion |
| Salt water resistance | GB/T 1263 "Determination of Chemical Resistance of Paint Films" | GB/T 1263 "Determination of Chemical Resistance of Paint Films " | There are 25℃ method and 40 ℃ method |
| Moisture resistance | GB /T1740 "Determination of Humidity and Heat Resistance of Paint Films " | GB/T 1740 "Determination of Knee Membrane Resistance to Humidity and Heat" | Tested at 47℃, humidity 96% |
| Salt spray box | GB/T 1771 "Determination of resistance to neutral salt spray of paints and varnishes" | GB/T 1771 "Determination of resistance to neutral salt spray of paints and varnishes" | NaCl: 50g/L, neutral salt spray at 35°C |
| Artificial accelerated aging test | GB /T 1190 "Light-water exposure equipment (carbon arc type) and implementation method for paint, varnish, spray paint and related products" | GB /T 1766 "Rating method for aging " GB/T 9277 " Evaluation " | The carbon plan is used as a simulated light source, and there is water spray, which has good simulation and acceleration |
| Atmospheric exposure experiment | GB /T 9276 "Coating Natural Weather Exposure Test Method" | GB /T 1766 " Methods for Grading Aging of Paints and Varnish Coatings " GB /T 9277 " Evaluation of Aging of Paint Coatings " | Basically the same as the actual usage |
