Introduction to the analysis method of raw materials for powder coatings (I)

appearance related to standards: GB/T 27809-2011 light or colorless transparent particles , no visible debris,GB/T 27808-2011 light or colorless transparent particles, no visible debris, GB/T 27808-2011 TGIC:white powder or particles; HAA: yellow to white powder or particles. Test method: visual 2(platinum cobalt) Transparent Liquid Color with Platinum -Cobalt Rating Color Part 1 Visual Method Method Principle: Compare the color of the sample with the color standard. The standard color matching fluid closest to the sample color was identified and the results were represented in platinum - cobalt units Chinese.reagents:(IV.) potassium chloride; cobalt chloride (II.) heteate; hydrochloric acid. instruments: color; terolight meter; color pool; of the color standard: platinum - cobalt standard raw liquid :500 - cobalt units; platinum -cobalt standard color solution (0-500): a total of 20 units.procedure: (1)pour a certain sample into a color tube to the tick line. (2) 7.2 place the plug on the color tube plug in the color meter and compare with the standard color fluid until the standard color fluid with the most matching color is found. of the results: the color of the sample is expressed in the color of the standard color solution that best matches the color of the sample, i.e. the number of platinum - cobalt units. If the color is between two standard color solutions, it is expressed in the number of units in which the color is darker. 3color paint, varnish and plastic non-volatile content determination, equivalent to the use of international standards: ISO 3251:2003 terminology and definition: non-volatile refers to the specified test conditions, the sample after volatile resulting in the quality score of the residue. equipment: metal or glass flat ;oven ; analytical balance; dryer.test step: two parallel tests. (1) oil removal and cleaning utensils. Dry the vessel at a specified or agreed temperature for a specified time and place in the dryer until used. (2) the quality m0 and sample quality m1,the sample is laid out in the vessel. (3) the vessel containing the sample in an oven at a specified temperature until the specified time has been removed. (4)the vessel to the dryer after heating to cool it to room temperature. (5)the mass of the weighing vessel and the remaining m2,generation formula to calculate the non-volatilew . (6)w0 in the product standard, the average of the two measurements as the final result. : The (1) be aware that the test temperature, test time and weighing volume meet the requirements of the standard. (2) test samples must be evenly tiled in the utensils, said good samples must be careful not to blow off. (3) before and after the test must be cooled and weighed in the dryer. 4Chemical Reagent Melting Point Range Determination General Method Melting Point Range Definition: Temperature range from the beginning of melting of the substance to full melting by capillary. Vispication: the (1) principle is to heat the sample in the melting point tube from below the temperature at the time of the initial melt to higher than the temperature at the time of the final melt, by visual observation of the temperature of the initial melt and the final melt to determine the melting point range of the sample. (2) instruments: round-bottom flaming bottles; test tubes; hoses; brackets; measuring thermometers and auxiliary thermometers; melting point tubes; heating devices; heating fluids. (3) measurement steps include, preparation of (1) samples: crushing, drying and loading (with 800mm high glass tube) . (2) sample: the thermally conductive liquid is heated to 10 degrees C below the initial melting point and warms up at a rate of 1±0.1 . (3) the temperature of the primary melt when a small droplet occurs in local melting, and the temperature at the time of complete melting of the sample is the final melting temperature. Record the temperature of the initial melt and the temperature of the final melt. (4) the results: the calculation of the thermometer reading correction or melting point range. instrument method: (1) principle is to heat samples in capillary tubes and observe changes in their phase change process or light transmission during phase change to determine the melting point. (2) instruments: melting tube; (3) measurement procedure: (1) sample pre-treatment; (2) according to the instrument instructions. The results are read out directly melting . : (1) Pay attention to sample pre-treatment ( crushing, drying and loading, etc .) ; (2) pay attention to heating speed. 5Test Method: GB/T 12007. 6-1989 epoxy resin softening point determination method global method, reference to the use of ISO4625:1980;Paint and varnish binder - soft The determination of the chemical point - Global Law method synthesization: the determination of the horizontal copper ring resin, under the action of the steel ball, in the water bath or glycerated bath, according to the prescribed speed heated to the temperature of the steel ball falling 25mm. instruments and reagents: copper rings; steel balls; copper ring frames; beers; thermometers; agitators; ovens; electric furnaces, etc. sample preparation: the sample is placed above the sample estimated softening point 60 degrees C heating 30min,to melt it. Pour the melted resin into the copper ring and mold it. After cooling at room temperature 30min test .test step: distilled water for resins with a softening point below 85 degrees C, and glycerated for 85 degrees C above. (1) the water bath or glycero bath below the estimated softening point 45 degrees C, the height of the liquid in the beech is 100mm to 108mm; (2) mounts the resin-mounted ring on the stand, places the steel ball in the heat-transmitting liquid used, and places it in the middle of the ring with a tweezer after 15min(3) the temperature into the center hole of the bracket. (4) stir until the test is complete. (5) begins to heat up, starting with a 3min warming rate of 5 degrees C/min, and then the heating speed should be adjusted to 0.5 degrees C/min until the temperature referred to by the thermometer when the steel ball falls on the lower plate after the resin softens to softening point . results show that (1) is measured twice in parallel, averaged, and taken to one after the number of points. (2) difference between the parallel measured values is not greater than 0.5 degrees C . note: (1) Pay attention to the correct use of thermal media; (2) Pay attention to the preparation of the test mold do not produce bubbles; (3) pay attention to the starting temperature of the heating process, heating speed, (4) test process must be used stirring, so that the test process temperature is uniform. (5) the correct reading of the softening point temperature. 6 Melt viscosity standard: GB/T 27809-2011 tested according to GB/T 9751.1-2008 regulations; GB/T 27808-2011 tested in accordance with GB/T 9751.1-2008 regulations. Test at one of these temperatures as agreed by the parties, GB/T 27807-2011 GB/T 2794-1995 . test method: GB/T 9751.1-2008 -color paint and varnish with rotary viscosity meter to determine viscosity Part 1: cone plate viscosity meter (equivalent to ISO2884-1:1999); GB/T 2794-1995 Adhesive viscosity measurement GB/T 9751.1-2008: (1) principle: the viscosity measured by the rotary viscosity meter is the dynamic viscosity, it is based on the oscic viscosity varies with the shear rate and reversible change. (2) instruments: rotating viscosity meter; (3) test step: three measurements. (1) the same sample should choose the same roors and speed, so that the reading on the dial 20% to 80%; (2) will be in a thermostat bath with the sample, so that the sample temperature and test temperature balance, and maintain the test temperature even. (3) the roor vertically into the center of the specimen and bring the liquid surface to the roor level mark. (4) the rotary viscosity meter and wait for the to . GB/T 2794-1995: (1) Instruments: Cone Plate