Resin varnish _ thick film coating _ performance testing scheme [with instrument list]

This article is excerpted from "Development of Solvent-based Thick Film Silicone Coatings", which mainly introduces the performance testing of resin varnishes and thick film coatings, including temperature resistance, chemical resistance, thermal weight loss analysis, contact angle test, gloss test, pencil Hardness test, coating adhesion test, expounding performance testing methods and attaching a list of instrument schemes.

1. Temperature resistance test

Put the coated silicone resin paint film with different R/Si values into a digital display electric heating constant temperature Drying Oven at 200°C for 1h, then put the silicone resin sample in a box-type resistance furnace at 350°C for 1h, take it out Cool to room temperature and conduct heat resistance test. Use a magnifying glass to observe the surface condition of the paint film of the test piece. If there are no cracks, reduced adhesion, peeling, color change, edge cracking, etc., it means that the paint film has good temperature resistance.

2. Performance test of chemical resistance

Use absorbent cotton to dip in ethanol and trichlorethylene respectively, and repeatedly wipe the surface of the silicone resin paint film to observe whether the paint film has substrate exposure, softening or falling off. If one or more of the above phenomena appear, it means The resin has poor chemical resistance.

3. Thermogravimetric analysis

Using a synchronous thermal analyzer, the atmosphere is argon, the heating rate is 10°C/min, and the temperature range is from 30°C to so0°C.

4. Contact angle test

The contact angles of the resin varnish coating film and the thick film coating film with water were measured on a contact angle measuring instrument. Each measurement is completed within 10 seconds of contact between the droplet and the sample surface, and 5 different places are selected for each sample for testing, and the average value of 5 results is taken.

5. Gloss test

The gloss of the coating film at 60° was measured with a gloss meter. For each sample, 5 different places were selected for testing, and the average of 5 results was taken as the final result. For samples with many surface defects, select areas with no defects or relatively few defects to test the glossiness.

6. Pencil hardness test

Use a pencil Hardness Tester to test the pencil hardness of the silicone resin sample according to GB/T6739-2006.

7. Coating adhesion test

Use a paint film adhesion Tester, according to GB/T1720-1979, to test the paint film adhesion of silicone resin samples.

8. Impact resistance test

According to GB/T1727, place the silicone resin paint film on the iron platform of the paint film impactor, let the weight fall freely on the punch from a certain height, record the height, and conduct three tests. Use a magnifying glass to observe whether the paint film has cracks, wrinkles and peeling off.

The following is a summary of the list of testing instruments for this experimental instrument plan, which is a reference for industry users to choose models.

Mechanical Properties - Destructive
	Modern environment QCJ-II-A (1m) paint film impact Tester
	Specification parameters: impact type spherical collision top impact, impact height 0~100cm, drop hammer mass 1000g, punch diameter Φ8mm, mold base aperture Φ15mm, meet the standard GB/T 1732-1993, overall size 252*140*1340mm, net weight of the instrument 14kg
Environmental testing - temperature and humidity control
	Shanghai Jingqi 202-1A Electric Heating Constant Temperature Drying Oven
	Specifications: power supply voltage ~220V 50Hz, power consumption 1000W, temperature control range RT+10~300°C, temperature fluctuation ±1°C, studio size 450×350×450 (mm), loading bracket (standard configuration) (block) 2
Physical Properties - Gloss
	3nh YG60 Gloss Meter
	Specification parameters: measuring angle 60°, measuring spot 9*15mm (60°), measuring range 0~1000GU, graduation value 0.1GU, characteristics can be used in paint ink, coating, paper printing, plastic electronics, furniture, ceramics, electroplating, Gloss measurement and gloss data transfer in hardware, marble and other industries. , measurement mode basic mode, statistical mode, continuous mode, quality control mode, measurement time 0.5s, repeatability 0~100GU: ±0.2GU; 100~1000GU: ±0.2%GU, accuracy meets JJG 696 first-class work gloss Instrument requirements, automatic shutdown time 30~120 seconds optional, automatic inspection and calibration/manual calibration at startup, operating language Simplified Chinese, English, Traditional Chinese, data storage 35,000 (basic mode and continuous mode 15,000, quality control mode 10,000 bar, statistical mode 10000), display 2.3 inch black and white display, dimensions 160*52*84mm, weight about 300g (including calibration box and battery), power supply 1 AA battery (AA alkaline battery or Ni-MH rechargeable battery), can measure more than 10000 times; or use USB port, data interface USB, software GQC6 quality management software, quality inspection report printing, more function expansion, working temperature 0~40°C (32~104°F), storage temperature -20~50°C (-4~122°F), working humidity less than 85%RH, no condensation, meet the standards ISO2813, GB/T9754, JJG696
General Laboratory Equipment - Temperature/Humidity
	Elite SX2-4-10G Resistance Box Furnace
	Specification parameters: the maximum temperature is 1000°C, the temperature control range is ≤900°C, the workpiece is heated with iron-chromium-aluminum alloy heating wire, the furnace volume is 7.2L, the heating power is 4KW, the temperature control accuracy is ±1°C, the heating rate is ≤15°C/min, and the temperature control Instrument LCD/intelligent PID temperature control, thermocouple K-type thermocouple, furnace size 300*200*120mm, power supply voltage AC220V 50Hz, overall size 650*520*670mm
Mechanical Properties - Hardness
	Modern Environment PPH-1000 Pencil Hardness Tester
	Specification parameters: load 1000g, applicable standard GB/T 6739-1996, standard pencil 6B-6H (13 pieces)
Mechanical Properties - Adhesion
	Jingke QFZ Adhesion Tester
	Specification parameters: the diameter of the drawing is the diameter of the drawing, the working stroke is ≥80mm, the weight of the weight is 100g, 500g, 200g, 200g, the effective area of the workbench is 100*50mm, the rotating needle adopts the 808 brand stylus, which can be easily replaced, and can be used less than 5 times