Based on the author's experience and experience in the formulation of road traffic marking paint (hereinafter referred to as marking paint) for many years, construction process research, engineering site construction, paint performance testing, standard formulation and consulting services, combined with the transportation industry standard JT/ T280-2004 "Pavement marking paint" and national standard GB/T16311-2005 "Quality Requirements and Testing Methods for Road Traffic Marking" as well as related national standards for paint, detailedly introduced the general requirements of marking paint and satisfies road traffic Special performance requirements and testing methods. It is pointed out that in order to produce excellent marking paints, it is necessary to do a good job in the quality control of the entire production process on the basis of strict quality control of raw materials, do a good job of each performance test, and control the paint's performance indicators. The road test is also used to verify the rationality and practicality of the formula. In view of the vastness of China’s territory and the variety of climate changes and application conditions, the use of marking paints with good effect in the northern regions may not be applicable to the southern region. The same marking paints in the arid regions of the west may not be suitable for hot and humid regions in the east. For this reason, It is necessary to make corresponding adjustments to the performance indicators of the marking paint to meet the needs of different regions, different seasons, and different conditions of use.
1 type of marking paint (see Table 1)
Table 1 The main varieties of China's existing marking paint
2 Items tested according to national standards for coatings
2.1 Detecting the Temperature and Humidity of the Environment
The adjustment of the sample state of the marking paint and the temperature and humidity of the test environment are in accordance with the national standard GB/T 9278 “Temperature and humidity of the state and test of the paint sampleâ€: the standard environment temperature (23±2)°C; relative humidity 50% ±5%.
2.2 The state of the paint in the container
Marking line paint at room temperature solvent, two-group classification, water-based (excluding hot-melt) in the state of the container according to GB/T3186 "sampling of coating products" requirements: the coating should be no agglomeration, crusting phenomenon, easy to stir uniform.
2.3 Viscosity
Viscosity affects the application performance of the marking coating and the properties of the coating and must be adjusted to a suitable viscosity.
(1) Normal temperature solvents are measured according to GB/T1723 "Determination of Coating Viscosity (Coating - 4 Viscosity Meter Method)". JT/T280-2004 "road marking paint" provisions (hereinafter referred to as the standard provisions) viscosity range of ≥ 100s.
(2) Normal temperature solvent-reflective type and water-based marking paints are measured according to GB/T 9269 "Determination of Viscosity of Architectural Coatings by Stormer Viscometer Method". The standard stipulates that the viscosity ranges from 80 to 120 (KU value) for the normal-temperature solvent reflective type, ≥ 70 (KU value) for the water-based ordinary type, and 80 to 120 (KU value) for the water-based reflective type.
2.4 Solid content
The solid content of normal-temperature solvent-based, water-based (other than hot-melt and two-component classifications) is determined according to GB/T 1725 "Solid solids content determination method."
Standards: Solvent common solids content ≥ 60%; solvent reflective solids ≥ 65%; water-based ordinary solids ≥ 70%; water-based reflective solids ≥ 75%.
2.5 density
The density of normal temperature solvents, two-component classifications, and water-based markings (other than hot-melt types) for marking coatings is measured according to GB/T 6750, "Determination of Paint and Varnish Density." The standard stipulates that the density of the ordinary type solvent should be ≥ 1.2g/cm3; the density of the solvent type reflecting at room temperature should be ≥ 1.3g/cm3; the density of the two-component ordinary type, reflective type and protruding type should be 1.5 ~ 2.0g/cm3 The density of water-based ordinary type should be ≥1.4g/cm3; the density of water-based reflective type should be ≥1.6g/cm3.
2.6 Softening point
Hot-melt marking paint is made of thermoplastic resin mixed with pigments, fillers and auxiliaries. During construction, the paint is applied to the road surface with a high-temperature liquid flow of 180-220°C. The performance and construction performance of this coating are closely related to the temperature. The standard uses a softening point as one of the indicators of coating quality control. The softening point is measured according to GB/T 9284 "paint and varnish with lacquer base softening point determination method of the world". The standard stipulates that the softening point of hot-melt type and hot-melt reflective type is 96-125°C; the softening point of hot-melt type is ≥100°C.
2.7 Adhesion
Solvents, two-component ordinary, water-based ordinary marking paint (except for hot-melt type, two-component reflective type, two-component protruding type, water-based reflective type) adhesion according to GB/T1720 "paint adhesion test Method determination. Standards: solvent type ≤ 4; two-component ordinary type ≤ 4; water-based ordinary type ≤ 5.
2.8 flexibility
Solvents of ordinary and reflective, two-component general flexibility according to GB/T1731 "film flexibility test" determination. The standard stipulates that the flexibility of ordinary and reflective types of solvents and the flexibility of two-component ordinary types are all 5mm.
2.9 Water resistance
The water resistance of marking paints was measured according to GB/T1733 "Water Resistance Test Method for Coating Films". The standard stipulates that there should be no abnormalities when soaked in water for 24 hours.
2.10 alkali resistance
The alkali resistance of the marking paint is measured according to GB/T9265 Determination of Alkali Resistance of Architectural Coatings. The standard stipulates that there should be no abnormality when soaked in a saturated solution of calcium hydroxide for 24 hours.
2.11 Wear resistance
Determination of abrasion resistance according to GB/T1768 "Determination of paint film wear resistance." It should be emphasized that the test conditions were specified as No. 100 grinding wheel and the load was 1000 g. The weight loss was measured after 200 revolutions. The standard stipulates that the weight loss for solvent, two-group classification, and water-based grinding should be ≤ 40mg, and that for hot-melt wear should be ≤ 80mg.
2.12 Artificial Weathering Acceleration
The experimental accelerated weathering resistance test of hot-melt and dual-class marking paints is based on GB/T16422.1 “Light Exposure Test of Plastics Laboratoryâ€. The standard stipulates that: after artificially accelerated weatherability test, the coating will not produce cracks and flaking; minor powdering and discoloration are allowed, but the chromaticity coordinates should be within the frame specified in Figure 1. The range of the luminance factor should not be greater than 20% of the original. .
Figure 1 The chroma range of the marking coating
2.13 color performance
The color of the marking paint is mainly white and yellow, its color performance is tested according to GB2893 "Safety Color", the instrument used is D65 standard light source illumination, the observation condition is 45°/0° color color difference meter, the detection result is colored Product coordinates and brightness factor are expressed.
The standard stipulates that the measured values ​​of the color coordinates (X, Y) should fall within the box shown in Figure 1. The ordinary type should fall within the solid line box, and the reflective type should fall within the dotted line box, with the white dotted line. Solid line boxes overlap.
The standard stipulates that: the brightness factor of ordinary white paint should be ≥ 0.75; the brightness factor of reflective white paint should be ≥ 0.35; the brightness factor of ordinary yellow paint should be ≥ 0.45; the brightness factor of reflective yellow paint should be ≥ 0.27.
3 Marking Paint Specific Inspection Items
3.1 Non-stick tire drying time
In order to allow traffic to be opened as soon as possible after construction of the marking line, the coating is required to dry quickly. Standards for various types of marking coating non-stick tire time shown in Table 2.
Table 2 Various types of marking coating Non-stick tire drying time min
The test method specified in the standard is to apply a 300 μm thick coating on an asbestos cement board (200 mm×150 mm×50 mm) and immediately time it. After 10 minutes of a solvent-based general-purpose paint (solvent-based reflective paint for 5 minutes), use non-sticky tires. The time analyzer rolls on the coating and checks that there is no adhesive coating on the roller and that the coating is wiped with solvent. After every 30s, measure it until the roller does not adhere to the paint. Record the time of non-stick tire.
3.2 Compressive strength
0.7-2.5mm thick hot-melt marking coating to withstand the frequent rolling of various vehicles and the summer heat test, must have sufficient compressive strength to prevent deformation and cracking. The specified test method is: pouring 3 pieces of 20mm×20mm×20mm paint compression test blocks, compressing for 24 hours at the standard test temperature, and the accuracy of the electronic universal material testing machine is not lower than 0.5. The preload is 10N, loading speed 30mm/min. The standard stipulates that the compressive strength of hot melt ordinary type and reflective type should be ≥12MPa; the type of hot melt protruding type should be ≥12MPa when (23±1)°C; and ≥2MPa when (50±2)°C.
3.3 glass beads content
As shown in Table 1, the hot-melt reflective marking coating should contain 18% to 25% of glass beads to ensure that the designated marking can continue to reflect light. The standard stipulates the method for determining the content of glass beads in hot-melt reflective paints by using ethyl acetate and xylene mixed solvent to remove the organic part (such as resin) in the paint, and then removing the inorganic part of the paint (such as filler) by dilute hydrochloric acid. , pigments, etc.) until the glass beads are completely separated, washed, dried, weighed, and calculated. 3.4 Low-temperature crack resistance Because of the thicker marking coating (0.7-2.5mm) for hot-melt coating construction, it is easy to crack under low-temperature conditions, so crack detection at low temperature is required. The standard stipulates that the sample shall be kept at -10°C for 4 hours and then left at room temperature for 4 hours. This shall be a cycle. There shall be no cracks after 3 consecutive cycles.
3.5 heating stability
The hot-melt coating needs to be heated to 180-220°C during construction. If the resin in the coating is resistant to high temperature, it will decompose and discolor under long-term high temperatures, thereby affecting the color performance and other properties of the coating. The standard stipulates that the coating should not show yellowing, coking, and agglomeration after being kept at 200-220°C for 4 hours.
3.6 Freeze-thaw stability
Freeze-thaw stability is the storage stability of waterborne marking paints at ambient temperatures below 0°C. The standard stipulates that the sample shall be kept in the covered iron cylinder at (-5±2)°C for 18 hours, and then immediately placed at (23±2)°C for 6 hours as a cycle. After 3 consecutive cycles, it shall be no. Caking, crusting, easy to stir.
The standard stipulates that the measured values ​​of the color coordinates (X, Y) should fall within the box shown in Figure 1. The ordinary type should fall within the solid line box, and the reflective type should fall within the dotted line box, with the white dotted line. Solid line boxes overlap.
The standard stipulates that: the brightness factor of ordinary white paint should be ≥ 0.75; the brightness factor of reflective white paint should be ≥ 0.35; the brightness factor of ordinary yellow paint should be ≥ 0.45; the brightness factor of reflective yellow paint should be ≥ 0.27.
3 Marking Paint Specific Inspection Items
3.1 Non-stick tire drying time
In order to allow traffic to be opened as soon as possible after construction of the marking line, the coating is required to dry quickly. Standards for various types of marking coating non-stick tire time shown in Table 2.
Table 2 Various types of marking coating Non-stick tire drying time min
The test method specified in the standard is to apply a 300 μm thick coating on an asbestos cement board (200 mm×150 mm×50 mm) and immediately time it. The solvent type general paint is applied for 10 min (solvent-based reflective paint for 5 min) and the non-stick tire is used. The time analyzer rolls on the coating and checks that there is no adhesive coating on the roller and that the coating is wiped with solvent. After every 30s, measure it until the roller does not adhere to the paint. Record the time of non-stick tire.
3.2 Compressive strength
0.7-2.5mm thick hot-melt marking coating to withstand the frequent rolling of various vehicles and the summer heat test, must have sufficient compressive strength to prevent deformation and cracking. The specified test method is: pouring 3 pieces of 20mm×20mm×20mm paint compression test blocks, compressing for 24 hours at the standard test temperature, and the accuracy of the electronic universal material testing machine is not lower than 0.5. The preload is 10N, loading speed 30mm/min. The standard stipulates that the compressive strength of hot melt ordinary type and reflective type should be ≥12MPa; the type of hot melt protruding type should be ≥12MPa when (23±1)°C; and ≥2MPa when (50±2)°C.
3.3 glass beads content
As shown in Table 1, the hot-melt reflective marking coating should contain 18% to 25% of glass beads to ensure that the designated marking can continue to reflect light. The standard stipulates the method for determining the content of glass beads in hot-melt reflective paints by using ethyl acetate and xylene mixed solvent to remove the organic part (such as resin) in the paint, and then removing the inorganic part of the paint (such as filler) by dilute hydrochloric acid. , pigments, etc.) until the glass beads are completely separated, washed, dried, weighed, and calculated. 3.4 Low-temperature crack resistance Because of the thicker marking coating (0.7-2.5mm) for hot-melt coating construction, it is easy to crack under low-temperature conditions, so crack detection at low temperature is required. The standard stipulates that the sample shall be kept at -10°C for 4 hours and then left at room temperature for 4 hours. This shall be a cycle. There shall be no cracks after 3 consecutive cycles.
3.5 heating stability
The hot-melt coating needs to be heated to 180-220°C during construction. If the resin in the coating is resistant to high temperature, it will decompose and discolor under long-term high temperatures, thereby affecting the color performance and other properties of the coating. The standard stipulates that the coating should not show yellowing, coking, and agglomeration after being kept at 200-220°C for 4 hours.
3.6 Freeze-thaw stability
Freeze-thaw stability is the storage stability of waterborne marking paints at ambient temperatures below 0°C. The standard stipulates that the sample shall be kept in the covered iron cylinder at (-5±2)°C for 18 hours, and then immediately placed at (23±2)°C for 6 hours as a cycle. After 3 consecutive cycles, it shall be no. Caking, crusting, easy to stir.
1 type of marking paint (see Table 1)
Table 1 The main varieties of China's existing marking paint
2 Items tested according to national standards for coatings
2.1 Detecting the Temperature and Humidity of the Environment
The adjustment of the sample state of the marking paint and the temperature and humidity of the test environment are in accordance with the national standard GB/T 9278 “Temperature and humidity of the state and test of the paint sampleâ€: the standard environment temperature (23±2)°C; relative humidity 50% ±5%.
2.2 The state of the paint in the container
Marking line paint at room temperature solvent, two-group classification, water-based (excluding hot-melt) in the state of the container according to GB/T3186 "sampling of coating products" requirements: the coating should be no agglomeration, crusting phenomenon, easy to stir uniform.
2.3 Viscosity
Viscosity affects the application performance of the marking coating and the properties of the coating and must be adjusted to a suitable viscosity.
(1) Normal temperature solvents are measured according to GB/T1723 "Determination of Coating Viscosity (Coating - 4 Viscosity Meter Method)". JT/T280-2004 "road marking paint" provisions (hereinafter referred to as the standard provisions) viscosity range of ≥ 100s.
(2) Normal temperature solvent-reflective type and water-based marking paints are measured according to GB/T 9269 "Determination of Viscosity of Architectural Coatings by Stormer Viscometer Method". The standard stipulates that the viscosity ranges from 80 to 120 (KU value) for the normal-temperature solvent reflective type, ≥ 70 (KU value) for the water-based ordinary type, and 80 to 120 (KU value) for the water-based reflective type.
2.4 Solid content
The solid content of normal-temperature solvent-based, water-based (other than hot-melt and two-component classifications) is determined according to GB/T 1725 "Solid solids content determination method."
Standards: Solvent common solids content ≥ 60%; solvent reflective solids ≥ 65%; water-based ordinary solids ≥ 70%; water-based reflective solids ≥ 75%.
2.5 density
The density of normal temperature solvents, two-component classifications, and water-based markings (other than hot-melt types) for marking coatings is measured according to GB/T 6750, "Determination of Paint and Varnish Density." The standard stipulates that the density of the ordinary type solvent should be ≥ 1.2g/cm3; the density of the solvent type reflecting at room temperature should be ≥ 1.3g/cm3; the density of the two-component ordinary type, reflective type and protruding type should be 1.5 ~ 2.0g/cm3 The density of water-based ordinary type should be ≥1.4g/cm3; the density of water-based reflective type should be ≥1.6g/cm3.
2.6 Softening point
Hot-melt marking paint is made of thermoplastic resin mixed with pigments, fillers and auxiliaries. During construction, the paint is applied to the road surface with a high-temperature liquid flow of 180-220°C. The performance and construction performance of this coating are closely related to the temperature. The standard uses a softening point as one of the indicators of coating quality control. The softening point is measured according to GB/T 9284 "paint and varnish with lacquer base softening point determination method of the world". The standard stipulates that the softening point of hot-melt type and hot-melt reflective type is 96-125°C; the softening point of hot-melt type is ≥100°C.
2.7 Adhesion
Solvents, two-component ordinary, water-based ordinary marking paint (except for hot-melt type, two-component reflective type, two-component protruding type, water-based reflective type) adhesion according to GB/T1720 "paint adhesion test Method determination. Standards: solvent type ≤ 4; two-component ordinary type ≤ 4; water-based ordinary type ≤ 5.
2.8 flexibility
Solvents of ordinary and reflective, two-component general flexibility according to GB/T1731 "film flexibility test" determination. The standard stipulates that the flexibility of ordinary and reflective types of solvents and the flexibility of two-component ordinary types are all 5mm.
2.9 Water resistance
The water resistance of marking paints was measured according to GB/T1733 "Water Resistance Test Method for Coating Films". The standard stipulates that there should be no abnormalities when soaked in water for 24 hours.
2.10 alkali resistance
The alkali resistance of the marking paint is measured according to GB/T9265 Determination of Alkali Resistance of Architectural Coatings. The standard stipulates that there should be no abnormality when soaked in a saturated solution of calcium hydroxide for 24 hours.
2.11 Wear resistance
Determination of abrasion resistance according to GB/T1768 "Determination of paint film wear resistance." It should be emphasized that the test conditions were specified as No. 100 grinding wheel and the load was 1000 g. The weight loss was measured after 200 revolutions. The standard stipulates that the weight loss for solvent, two-group classification, and water-based grinding should be ≤ 40mg, and that for hot-melt wear should be ≤ 80mg.
2.12 Artificial Weathering Acceleration
The experimental accelerated weathering resistance test of hot-melt and dual-class marking paints is based on GB/T16422.1 “Light Exposure Test of Plastics Laboratoryâ€. The standard stipulates that: after artificially accelerated weatherability test, the coating will not produce cracks and flaking; minor powdering and discoloration are allowed, but the chromaticity coordinates should be within the frame specified in Figure 1. The range of the luminance factor should not be greater than 20% of the original. .
Figure 1 The chroma range of the marking coating
2.13 color performance
The color of the marking paint is mainly white and yellow, its color performance is tested according to GB2893 "Safety Color", the instrument used is D65 standard light source illumination, the observation condition is 45°/0° color color difference meter, the detection result is colored Product coordinates and brightness factor are expressed.
The standard stipulates that the measured values ​​of the color coordinates (X, Y) should fall within the box shown in Figure 1. The ordinary type should fall within the solid line box, and the reflective type should fall within the dotted line box, with the white dotted line. Solid line boxes overlap.
The standard stipulates that: the brightness factor of ordinary white paint should be ≥ 0.75; the brightness factor of reflective white paint should be ≥ 0.35; the brightness factor of ordinary yellow paint should be ≥ 0.45; the brightness factor of reflective yellow paint should be ≥ 0.27.
3 Marking Paint Specific Inspection Items
3.1 Non-stick tire drying time
In order to allow traffic to be opened as soon as possible after construction of the marking line, the coating is required to dry quickly. Standards for various types of marking coating non-stick tire time shown in Table 2.
Table 2 Various types of marking coating Non-stick tire drying time min
The test method specified in the standard is to apply a 300 μm thick coating on an asbestos cement board (200 mm×150 mm×50 mm) and immediately time it. After 10 minutes of a solvent-based general-purpose paint (solvent-based reflective paint for 5 minutes), use non-sticky tires. The time analyzer rolls on the coating and checks that there is no adhesive coating on the roller and that the coating is wiped with solvent. After every 30s, measure it until the roller does not adhere to the paint. Record the time of non-stick tire.
3.2 Compressive strength
0.7-2.5mm thick hot-melt marking coating to withstand the frequent rolling of various vehicles and the summer heat test, must have sufficient compressive strength to prevent deformation and cracking. The specified test method is: pouring 3 pieces of 20mm×20mm×20mm paint compression test blocks, compressing for 24 hours at the standard test temperature, and the accuracy of the electronic universal material testing machine is not lower than 0.5. The preload is 10N, loading speed 30mm/min. The standard stipulates that the compressive strength of hot melt ordinary type and reflective type should be ≥12MPa; the type of hot melt protruding type should be ≥12MPa when (23±1)°C; and ≥2MPa when (50±2)°C.
3.3 glass beads content
As shown in Table 1, the hot-melt reflective marking coating should contain 18% to 25% of glass beads to ensure that the designated marking can continue to reflect light. The standard stipulates the method for determining the content of glass beads in hot-melt reflective paints by using ethyl acetate and xylene mixed solvent to remove the organic part (such as resin) in the paint, and then removing the inorganic part of the paint (such as filler) by dilute hydrochloric acid. , pigments, etc.) until the glass beads are completely separated, washed, dried, weighed, and calculated. 3.4 Low-temperature crack resistance Because of the thicker marking coating (0.7-2.5mm) for hot-melt coating construction, it is easy to crack under low-temperature conditions, so crack detection at low temperature is required. The standard stipulates that the sample shall be kept at -10°C for 4 hours and then left at room temperature for 4 hours. This shall be a cycle. There shall be no cracks after 3 consecutive cycles.
3.5 heating stability
The hot-melt coating needs to be heated to 180-220°C during construction. If the resin in the coating is resistant to high temperature, it will decompose and discolor under long-term high temperatures, thereby affecting the color performance and other properties of the coating. The standard stipulates that the coating should not show yellowing, coking, and agglomeration after being kept at 200-220°C for 4 hours.
3.6 Freeze-thaw stability
Freeze-thaw stability is the storage stability of waterborne marking paints at ambient temperatures below 0°C. The standard stipulates that the sample shall be kept in the covered iron cylinder at (-5±2)°C for 18 hours, and then immediately placed at (23±2)°C for 6 hours as a cycle. After 3 consecutive cycles, it shall be no. Caking, crusting, easy to stir.
The standard stipulates that the measured values ​​of the color coordinates (X, Y) should fall within the box shown in Figure 1. The ordinary type should fall within the solid line box, and the reflective type should fall within the dotted line box, with the white dotted line. Solid line boxes overlap.
The standard stipulates that: the brightness factor of ordinary white paint should be ≥ 0.75; the brightness factor of reflective white paint should be ≥ 0.35; the brightness factor of ordinary yellow paint should be ≥ 0.45; the brightness factor of reflective yellow paint should be ≥ 0.27.
3 Marking Paint Specific Inspection Items
3.1 Non-stick tire drying time
In order to allow traffic to be opened as soon as possible after construction of the marking line, the coating is required to dry quickly. Standards for various types of marking coating non-stick tire time shown in Table 2.
Table 2 Various types of marking coating Non-stick tire drying time min
The test method specified in the standard is to apply a 300 μm thick coating on an asbestos cement board (200 mm×150 mm×50 mm) and immediately time it. The solvent type general paint is applied for 10 min (solvent-based reflective paint for 5 min) and the non-stick tire is used. The time analyzer rolls on the coating and checks that there is no adhesive coating on the roller and that the coating is wiped with solvent. After every 30s, measure it until the roller does not adhere to the paint. Record the time of non-stick tire.
3.2 Compressive strength
0.7-2.5mm thick hot-melt marking coating to withstand the frequent rolling of various vehicles and the summer heat test, must have sufficient compressive strength to prevent deformation and cracking. The specified test method is: pouring 3 pieces of 20mm×20mm×20mm paint compression test blocks, compressing for 24 hours at the standard test temperature, and the accuracy of the electronic universal material testing machine is not lower than 0.5. The preload is 10N, loading speed 30mm/min. The standard stipulates that the compressive strength of hot melt ordinary type and reflective type should be ≥12MPa; the type of hot melt protruding type should be ≥12MPa when (23±1)°C; and ≥2MPa when (50±2)°C.
3.3 glass beads content
As shown in Table 1, the hot-melt reflective marking coating should contain 18% to 25% of glass beads to ensure that the designated marking can continue to reflect light. The standard stipulates the method for determining the content of glass beads in hot-melt reflective paints by using ethyl acetate and xylene mixed solvent to remove the organic part (such as resin) in the paint, and then removing the inorganic part of the paint (such as filler) by dilute hydrochloric acid. , pigments, etc.) until the glass beads are completely separated, washed, dried, weighed, and calculated. 3.4 Low-temperature crack resistance Because of the thicker marking coating (0.7-2.5mm) for hot-melt coating construction, it is easy to crack under low-temperature conditions, so crack detection at low temperature is required. The standard stipulates that the sample shall be kept at -10°C for 4 hours and then left at room temperature for 4 hours. This shall be a cycle. There shall be no cracks after 3 consecutive cycles.
3.5 heating stability
The hot-melt coating needs to be heated to 180-220°C during construction. If the resin in the coating is resistant to high temperature, it will decompose and discolor under long-term high temperatures, thereby affecting the color performance and other properties of the coating. The standard stipulates that the coating should not show yellowing, coking, and agglomeration after being kept at 200-220°C for 4 hours.
3.6 Freeze-thaw stability
Freeze-thaw stability is the storage stability of waterborne marking paints at ambient temperatures below 0°C. The standard stipulates that the sample shall be kept in the covered iron cylinder at (-5±2)°C for 18 hours, and then immediately placed at (23±2)°C for 6 hours as a cycle. After 3 consecutive cycles, it shall be no. Caking, crusting, easy to stir.
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