CN117907217A - Method for judging whether adhesion between glass cement of vehicle window and paint of automobile is qualified or not - Google Patents
Method for judging whether adhesion between glass cement of vehicle window and paint of automobile is qualified or not Download PDFInfo
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- CN117907217A CN117907217A CN202211272301.0A CN202211272301A CN117907217A CN 117907217 A CN117907217 A CN 117907217A CN 202211272301 A CN202211272301 A CN 202211272301A CN 117907217 A CN117907217 A CN 117907217A
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- paint
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- 239000011521 glass Substances 0.000 title claims abstract description 155
- 239000004568 cement Substances 0.000 title claims abstract description 84
- 239000003973 paint Substances 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000000576 coating method Methods 0.000 claims abstract description 170
- 239000011248 coating agent Substances 0.000 claims abstract description 167
- 239000002131 composite material Substances 0.000 claims abstract description 119
- 239000002390 adhesive tape Substances 0.000 claims abstract description 66
- 239000000758 substrate Substances 0.000 claims abstract description 64
- 238000005520 cutting process Methods 0.000 claims abstract description 26
- 238000001035 drying Methods 0.000 claims abstract description 4
- 238000005507 spraying Methods 0.000 claims description 36
- 238000000926 separation method Methods 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 22
- 239000002966 varnish Substances 0.000 claims description 18
- 239000010960 cold rolled steel Substances 0.000 claims description 5
- 239000011324 bead Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 description 44
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 18
- 239000000853 adhesive Substances 0.000 description 8
- 230000001070 adhesive effect Effects 0.000 description 8
- 239000005357 flat glass Substances 0.000 description 7
- 239000003292 glue Substances 0.000 description 7
- 238000001962 electrophoresis Methods 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 241000178435 Eliokarmos dubius Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
Abstract
The invention discloses a method for judging whether the adhesiveness between a glass cement for a vehicle window and a paint of an automobile is qualified or not, which comprises the following steps: 1) Providing a substrate; 2) Forming a composite coating on the substrate; 3) Coating glass cement on the composite coating and drying to obtain glass cement strips, wherein the number of the glass cement strips is more than 2; 4) Cutting and separating one end of a glass adhesive tape from the composite coating along the joint surface of the glass adhesive tape and the composite coating, so that the glass adhesive tape has a movable end part; 5) Applying an upward force perpendicular to the substrate to the movable end of the glass strip obtained in step 4) so that the glass strip is further separated from the composite coating by at least a portion, and recording the morphology of the separated portion of the composite coating; 6) And separating the glass adhesive tape from the bonding surface, observing the morphology of the composite coating, counting, and judging whether the composite coating is qualified or not. The method is simple and feasible, has high accuracy, and is suitable for practical production and coating.
Description
Technical Field
The invention relates to the technical field of glass cement. And more particularly to a method for determining whether the adhesion between a glazing and an automotive paint is acceptable.
Background
The glass cement for the automobile window is used for bonding automobile paint and automobile window glass, good cohesiveness is required between the glass cement and the automobile paint, and whether the adhesion between the glass cement for the automobile window and the automobile paint is qualified or not can be accurately judged. However, there is a method of measuring the interlayer adhesion between a paint and a substrate by the hundred method, but there is no method of directly measuring the adhesion between a glass cement and a paint of an automobile. The hundred lattice method is a method for measuring the adhesiveness between the paint and the substrate, is suitable for the adhesiveness between a hard coating and the substrate, is soft after the glass cement is dried, is thicker after the glass cement coating is dried, and is difficult to measure the adhesiveness between the glass cement and the composite coating by cutting the paint composite coating on the substrate from the surface of the glass cement by a knife, so that the method cannot reflect the degree of the adhesiveness between the glass cement and the automobile paint, and has large test result error and low accuracy.
Disclosure of Invention
Based on the above facts, an object of the present invention is to provide a method for judging whether the adhesion between a window glass paste and a paint of an automobile is acceptable. The method has high accuracy, and the client does not feedback the problem of adhesiveness NG between the glass cement and the automobile paint.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a method for judging whether the adhesiveness between the glass cement of the vehicle window and the paint of the vehicle is qualified or not comprises the following steps:
1) Providing a substrate;
2) Forming a composite coating on the substrate;
3) Coating glass cement on the composite coating and drying to obtain glass cement strips, wherein the number of the glass cement strips is more than 2;
4) Cutting and separating one end of a glass adhesive tape from the composite coating along the joint surface of the glass adhesive tape and the composite coating, so that the glass adhesive tape has a movable end part;
5) Applying an upward force perpendicular to the substrate to the movable end of the glass strip obtained in step 4) so that the glass strip is further separated from the composite coating by at least a portion, and recording the morphology of the separated portion of the composite coating;
6) Cutting along the opening of the joint surface of the glass adhesive tape and the composite coating in the step 5), applying upward force vertical to the substrate to the movable end part of the glass adhesive tape, separating a part of the glass adhesive tape from the composite coating, and recording the morphology of the composite coating of the separated part;
7) Repeating step 6) until the glass adhesive tape is completely separated from the composite coating;
8) Repeating the steps 4) -7), and sequentially separating other glass adhesive tapes from the composite coating;
9) And judging whether the adhesion between the glass cement of the vehicle window and the paint of the vehicle is qualified or not by counting the appearance of the composite coating of the separated part each time.
Further, in the step 2), the composite coating is a middle coating, a top coating and a varnish which are sequentially arranged.
Further, in the step 3), the glass cement is continuously and uniformly coated on the surface of the composite coating in the form of a triangular rubber strip, wherein the width of the bottom of the coated triangular rubber is 8-12mm, the height is 8-10mm, and the length is 150+/-20 mm;
and then flattening the coated glass cement into glass cement strips with the height of 6+/-1 mm.
Further, the angle between the cutting direction and the substrate is 60 degrees+/-15 degrees, and the cutting depth is the depth of cutting through the composite coating to the substrate.
Further, in step 4) and step 6), the force is applied in such a magnitude that the glass bead is separated from the composite coating by a length of 10mm to 20mm.
Further, in step 9), the method for judging whether the adhesion between the glass frit and the paint of the automobile is qualified or not by counting the morphology of the composite coating of each separated part comprises the following steps:
After separating the glass adhesive tape from the composite coating by a part each time, observing the morphology of a separation surface on the composite coating, if the separation surface is damaged by less than 50 percent of area, marking the separation surface as qualified, otherwise marking the separation surface as unqualified;
Counting the qualified times, and counting the total number as m; counting the unqualified times, and counting the total number as n, wherein m and n are positive integers;
if m/m+n is more than 75%, the adhesiveness between the glass cement for the vehicle window and the paint of the vehicle is qualified;
if m/m+n is less than 75%, the adhesion between the glass frit and the paint of the automobile is not qualified.
Further, in step 1), the substrate is a cold-rolled steel sheet for automobile body, and the size of the substrate is preferably 100×200mm.
Further, in step 2), the method of forming a composite coating on a substrate includes the steps of:
Spraying 30-35 mu m aqueous middle coating on a substrate, leveling for 3min at the temperature of 23+/-2 ℃ and the humidity of 65+/-5%, baking for 5min at the temperature of 80 ℃ and baking for 20min at the temperature of 140 ℃;
coating water-based finish paint with the thickness of 15-20 mu m on water, leveling for 3min at the temperature of 23+/-2 ℃ and the humidity of 65+/-5%, and baking for 5min at the temperature of 80 ℃;
spraying varnish with the thickness of 30-40 mu m on the water-based surface paint, leveling for 7min under the conditions of the temperature of 23+/-2 ℃ and the humidity of 65+/-5%, and baking for 20min under the conditions of 140 ℃ so as to form a composite coating on a substrate;
Or alternatively
Spraying 15-20 mu m aqueous intermediate coating on a substrate, and baking under the conditions: 80 ℃ for x3min;
Coating water-based finish paint with the thickness of 15-20 mu m on water, leveling for 3min at the temperature of 23+/-2 ℃ and the humidity of 65+/-5%, and baking for 5min at the temperature of 80 ℃;
spraying varnish with the thickness of 30-40 mu m on the water-based surface paint, leveling for 7min under the conditions of the temperature of 23+/-2 ℃ and the humidity of 65+/-5%, and baking for 20min under the conditions of 140 ℃ so as to form a composite coating on a substrate;
Or alternatively
Spraying 30-35 mu m of oily middle coating on a substrate, leveling for 7min at the temperature of 23+/-2 ℃ and the humidity of 65+/-5%, and baking for 20min at 140 ℃;
Spraying 15-20 mu m aqueous finish paint on the middle coating, leveling for 3min at the temperature of 23+/-2 ℃ and the humidity of 65+/-5%, and baking for 5min at the temperature of 80 ℃;
And (3) spraying varnish with the thickness of 30-40 mu m on the finish paint, leveling for 7min at the temperature of 23+/-2 ℃ and the humidity of 65+/-5%, and baking for 20min at the temperature of 140 ℃ so as to form the composite coating on the substrate.
Further, the glass cement is glass cement for automobile windows.
The beneficial effects of the invention are as follows:
in the method, a method capable of directly measuring the adhesion between the glass cement and the paint of the automobile is provided, and the blank in the corresponding field is filled. Meanwhile, the method has high accuracy of detection results and small error, and is suitable for judging the matching property of glass cement and automobile paint before on-site coating.
Drawings
The following describes the embodiments of the present invention in further detail with reference to the drawings.
FIG. 1 shows a schematic view of the application of a glass strip in some embodiments.
FIG. 2 shows a schematic view of a cut glass strip in some embodiments.
Detailed Description
In order to more clearly illustrate the present invention, the present invention will be further described with reference to preferred embodiments and the accompanying drawings. Like parts in the drawings are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and that this invention is not limited to the details given herein.
Based on the problem that whether the adhesion between the glass cement for the vehicle window and the paint of the automobile is qualified or not can not be accurately judged in the prior art, the specific embodiment of the invention provides a method for judging whether the adhesion between the glass cement for the vehicle window and the paint of the automobile is qualified or not, which comprises the following steps:
1) A substrate is provided.
Suitable substrates are cold-rolled steel sheets for automotive bodies. The size of the substrate is preferably (50-100) mmx (200-300) mm.
An exemplary substrate may be an electrophoretic sheet, which is wiped clean with a nonwoven and isopropyl alcohol (IPA) prior to use.
2) A composite coating is formed on the substrate.
The composite coating can comprise an intermediate coating, a top coating and a varnish which are arranged in sequence. The intermediate coat, the top coat and the varnish may be aqueous or solvent, and may be selected by those skilled in the art as required, without being particularly limited thereto.
Illustratively, a method of forming a composite coating on a substrate includes the steps of:
Spraying 30-35 mu m aqueous middle coating on a substrate, leveling for 3min at the temperature of 23+/-2 ℃ and the humidity of 65+/-5%, baking for 5min at the temperature of 80 ℃ and baking for 20min at the temperature of 140 ℃;
coating water-based finish paint with the thickness of 15-20 mu m on water, leveling for 3min at the temperature of 23+/-2 ℃ and the humidity of 65+/-5%, and baking for 5min at the temperature of 80 ℃;
spraying varnish of 30-40 mu m on the water-based surface paint, leveling for 7min under the conditions of the temperature of 23+/-2 ℃ and the humidity of 65+/-5%, and baking for 20min under the conditions of 140 ℃ so as to form a composite coating on the substrate.
Illustratively, a method of forming a composite coating on a substrate includes the steps of:
spraying 15-20 mu m aqueous intermediate coating on a substrate, and baking under the conditions: 80 ℃ for x3min;
Coating water-based finish paint with the thickness of 15-20 mu m on water, leveling for 3min at the temperature of 23+/-2 ℃ and the humidity of 65+/-5%, and baking for 5min at the temperature of 80 ℃;
spraying varnish of 30-40 mu m on the water-based surface paint, leveling for 7min under the conditions of the temperature of 23+/-2 ℃ and the humidity of 65+/-5%, and baking for 20min under the conditions of 140 ℃ so as to form a composite coating on the substrate.
Illustratively, a method of forming a composite coating on a substrate includes the steps of:
Spraying 30-35 mu m of oily middle coating on a substrate, leveling for 7min at the temperature of 23+/-2 ℃ and the humidity of 65+/-5%, and baking for 20min at 140 ℃;
Spraying 15-20 mu m aqueous finish paint on the middle coating, leveling for 3min at the temperature of 23+/-2 ℃ and the humidity of 65+/-5%, and baking for 5min at the temperature of 80 ℃;
And (3) spraying varnish with the thickness of 30-40 mu m on the finish paint, leveling for 7min at the temperature of 23+/-2 ℃ and the humidity of 65+/-5%, and baking for 20min at the temperature of 140 ℃ so as to form the composite coating on the substrate.
3) And coating glass cement on the composite coating and drying to obtain glass cement strips, wherein the number of the glass cement strips is more than 2.
In this embodiment, the glass frit may be an automotive window glass frit. In this embodiment, the specific choice of glass cement is not required.
Illustratively, forming the glass strip on the composite coating may include the steps of:
a. And continuously and uniformly coating the glass cement on the surface of the composite coating in the form of a triangular rubber strip, wherein the width of the bottom of the coated triangular rubber is 12-18mm, the height is 8-10mm, and the length is 150+/-20 mm.
A glue gun may be used to apply the glass cement to the composite coating. The front end of the glue outlet of the glue gun is lightly touched on the surface of the test board in the coating process of the glass glue, and the glue gun is vertical to the surface of the test board.
The glass cement is coated along the long side of the substrate. The glass adhesive tapes are arranged in parallel.
B. and c, flattening the glass cement coated in the step a into a glass cement strip with the height of 6+/-1 mm.
Specifically, the glass adhesive tape with the height of 6+/-1 mm can be flattened by a PE film within 5min after the glass adhesive tape is coated in the step a.
The glass strips are preferably arranged parallel to each other, and the distance between adjacent glass strips is preferably 20-30mm.
In each formed glass adhesive tape, the positions of the glass adhesive tapes at the two ends and the edge of the substrate are 10-15mm or more.
4) And cutting and separating one end of one glass adhesive tape from the composite coating along the joint surface of the glass adhesive tape and the composite coating, so that the glass adhesive tape has a movable end part.
Placing the product obtained in the step 3) for more than 168 hours before cutting.
The cutting may be performed using a knife. Any one of the two glass adhesive tapes is directly cut along the surface of the paint composite coating to scratch the paint film of the paint composite coating on the substrate. The direction of the knife cutting the glass adhesive tape is that the angle between the knife and the plate is preferably 60 degrees+/-15 degrees, and the obtained test result is more accurate; the cutting point is the joint of the glass adhesive tape and the composite coating; because the overall thickness of the composite coating is very thin, the depth of cut is preferably such that the cut cuts through the composite coating to the substrate. The cutting width is longer than the width of the glass cement. Illustratively, the knife blade may be a 9mm wallpaper blade of commercial specifications.
5) Applying an upward force perpendicular to the substrate to the movable end of the glass strip obtained in step 4) such that the glass strip is further separated from the composite coating by at least a portion and recording the topography of the separated portion of the composite coating.
The force applied is of a length such that the glass strip is separated from the composite coating by a length of 10mm to 20mm. In practice, the movable end of the glass strip can be further separated from the composite coating by pulling the movable end upward by hand, so that the length of the movable portion of the glass strip is increased by 10mm-20mm.
Wherein, the morphology of the composite coating of the separated part is recorded specifically comprises: the failure of the composite coating on the release surface was recorded.
Further, the applied force causes the glass strip to separate further completely from the composite coating.
6) Cutting along the opening of the joint surface of the glass adhesive tape and the composite coating in the step 5), applying upward force perpendicular to the substrate to the movable end of the glass adhesive tape, so that the glass adhesive tape is further separated from the composite coating by a part, and recording the morphology of the separated part of the composite coating.
In this step, reference may be made to the above step 4), and the magnitude and manner of the applied force may be referred to the above step 5), which is not described herein.
In this step, the length of the glass strip further separated from the composite coating is the same as in step 5) to ensure the accuracy of the test.
7) Repeating step 6) until the glass adhesive tape is completely separated from the composite coating.
8) Repeating the steps 4) -7), and sequentially separating other glass adhesive tapes from the composite coating.
The test substrates were placed at a constant atmosphere of 40 c/100% relative humidity for 240 hours before each separation of the other glass strips from the composite coating, and then removed for testing.
9) And judging whether the adhesion between the glass cement of the vehicle window and the paint of the vehicle is qualified or not by counting the appearance of the composite coating of the separated part each time.
Illustratively, the method for judging whether the adhesion between the glass cement and the paint of the automobile is qualified or not by counting the morphology of the composite coating of each separated part comprises the following steps:
After separating the glass adhesive tape from the composite coating by a part each time, observing the morphology of a separation surface on the composite coating, if the separation surface is damaged by less than 50 percent of area, marking the separation surface as qualified, otherwise marking the separation surface as unqualified;
Counting the qualified times, and counting the total number as m; counting the unqualified times, and counting the total number as n, wherein m and n are positive integers;
if m/m+n is more than 75%, the adhesiveness between the glass cement for the vehicle window and the paint of the vehicle is qualified;
if m/m+n is less than 75%, the adhesion between the glass frit and the paint of the automobile is not qualified.
The method has high test accuracy and no problem of NG feedback from clients.
Further, if air or air streaks are present in the middle of the strip during the process of separating the glass strip from the composite coating, this area is not considered for evaluation. If the air area in the whole glass adhesive tape is too long (more than or equal to 25% of the cut surface), the adhesion between the glass adhesive tape and the composite coating can not be evaluated, and the experiment should be reworked.
Further, in the above steps 4) to 9), test and test environment: temperature (23.+ -. 2 ℃ C.) and humidity (50.+ -. 10%).
The following describes the technical scheme of the present invention with reference to some specific embodiments:
example 1
The adhesion between the automotive window glass cement and the automotive paint coating was tested: wherein, the automobile window glass cement is SUNSTAR H C.
The test method specifically comprises the following steps:
test and test environment: temperature (23.+ -. 2 ℃ C.), humidity (50.+ -. 10%)
Test board material: cold-rolled steel sheet for automobile body;
test plate: cut from the body part top coat or made according to the following method:
The method comprises the following steps:
A. spraying 30-35 μm water-based automobile middle coating (AQU-3004) on 100x200mm electrophoresis plate, leveling for 3min at 23+ -2deg.C and 65+ -5% humidity, baking for 5min at 80deg.C, and baking for 20min at 140deg.C;
B. Spraying 15-20 mu m aqueous automobile finish (AR-3020-1 8X 2) on the middle layer, leveling for 3min at 23+ -2deg.C and 65+ -5% humidity, and baking for 5min at 80deg.C;
C. Spraying 30-40 μm varnish (MAC 0-1860-X) on the finish paint, leveling for 7min at 23+ -2deg.C and 65+ -5% humidity, and baking for 20min at 140 deg.C.
Or alternatively
A. 15-20 mu m aqueous automobile intermediate coating (AR-620 8105) sprayed on 100x200mm electrophoresis board, baking strip
Piece (2): 80 ℃ for x3min;
B. spraying 15-20 mu m aqueous automobile finish (AR-3020-1 8X 2), leveling for 3min at 23+ -2deg.C and 65+ -5% humidity, and baking at 80deg.C for 5min;
C. Spraying 30-40 μm varnish (MAC 0-1860-X) on the finish paint, leveling for 7min at 23+ -2deg.C and 65+ -5% humidity, and baking for 20min at 140 deg.C.
Or alternatively
A. Spraying 30-35 μm oily automobile middle coating (OP-5-1 8105) on a 100x200mm electrophoresis board, leveling for 7min under the condition that the temperature is 23+/-2 ℃ and the humidity is 65+/-5%, and baking for 20min under the condition of 140 ℃;
B. Spraying 15-20 mu m aqueous automobile finish (AR-3020-1 8X 2) on the middle layer, leveling for 3min at 23+ -2deg.C and 65+ -5% humidity, and baking for 5min at 80deg.C;
C. Spraying 30-40 μm varnish (MAC 0-1860-X) on the finish paint, leveling for 7min at 23+ -2deg.C and 65+ -5% humidity, and baking for 20min at 140 deg.C.
Test panel cleaning: the test panels were wiped clean with nonwoven and isopropyl alcohol (IPA) prior to testing.
The glass cement coating mode comprises the following steps: and continuously and uniformly coating the glass cement on the surface of the test board in the form of a triangular rubber strip (the bottom of the coated glass cement is 8-12mm, the height is 8-10mm, and the length is 150+/-20 mm), and lightly touching the surface of the test board at the front end of a cement outlet of a cement gun in the coating process, wherein the cement gun is vertical to the surface of the test board.
Coating a glass adhesive tape: two strips of glass cement were applied to both sides of the test plate as shown in fig. 1.
Glass adhesive tape treatment: and (5) flattening the adhesive tape into adhesive tapes with the height of 6+/-1 mm by using a PE film within 5 minutes after the adhesive coating.
The testing process comprises the following steps: ① After the test plate combined with the glass adhesive tape was placed for 168 hours, any one of the two glass adhesive tapes was cut directly along the surface of the paint composite coating using a sharp knife to scratch the paint film of the paint composite coating on the substrate, as shown in fig. 2. Wherein, the direction of glass adhesive tape is cut to the knife is: the angle between the knife and the plate is 60 degrees plus or minus 15 degrees; the cutting point is the joint of the adhesive tape and the plate; cutting the composite coating to the substrate by cutting the composite coating; the cutting length is longer than the width of the glass cement; each cut point is spaced apart by a distance of 10mm while holding the strip evenly forced upward as shown in fig. 2: the included angle between the pulling-out angle and the plate is 90 degrees, at the moment, the pulling force of the glass cement on the composite coating is maximum, and the pulling force between the adhesive tape and the composite coating can be reduced when the angle is too large or too small. Pulling out the loose end until the adhesive tape is torn. The adhesive strip is then cut again along the substrate and pulled repeatedly until torn again. This procedure was repeated over the whole length of the strip so that the fracture pattern could be clearly assessed.
② The test plate is placed under constant atmosphere 40 ℃/100% relative humidity for 240 hours, and after the test plate is taken out, the second glass cement is subjected to adhesion test between glass cement and paint composite coating in 30 minutes by using a ① test mode.
Description: if air or air pockets in the middle of the strip occur during the evaluation (possibly due to air sealed into the strip during the glue application), this area is not considered for evaluation. If the air area in the adhesive tape is too long (25% of the cut surface is not equal), the adhesion between the adhesive tape and the composite coating cannot be evaluated, and the experiment should be reworked.
After separating the glass adhesive tape from the composite coating by a part each time, observing the morphology of a separation surface on the composite coating, if the separation surface is damaged by less than 50 percent of area, marking the separation surface as qualified, otherwise marking the separation surface as unqualified;
After each separation, the ratio of the total number of qualified fracture surfaces to the total number of fracture surfaces is 100%, and the adhesion between the glass fiber reinforced plastic and the automobile paint is qualified.
The glass cement is further used for the actual automobile coated by the composite coating, the condition of the adhesion NG between the glass cement and the composite coating does not occur in the production of multiple batches, and the condition of the adhesion NG between the glass cement and the composite coating is not received at the same time. The method is high in accuracy.
Example 2
The adhesion between the automotive window glass cement and the automotive paint coating was tested: wherein, the automobile window glass adhesive is W-868.
The test method specifically comprises the following steps:
test and test environment: temperature (23.+ -. 2 ℃ C.), humidity (50.+ -. 10%);
Test board material: cold-rolled steel sheet for automobile body;
test plate: cut from the body part top coat or made according to the following method:
A. spraying 30-35 μm water-based automobile middle coating (AQU-3004) on 100x200mm electrophoresis plate, leveling for 3min at 23+ -2deg.C and 65+ -5% humidity, baking for 5min at 80deg.C, and baking for 20min at 140deg.C;
B. Spraying 15-20 mu m aqueous automobile finish (AR-3020-1 8X 2) on the middle layer, leveling for 3min at 23+ -2deg.C and 65+ -5% humidity, and baking for 5min at 80deg.C;
C. Spraying 30-40 μm varnish (MAC 0-1860-X) on the finish paint, leveling for 7min at 23+ -2deg.C and 65+ -5% humidity, and baking for 20min at 140 deg.C.
Or alternatively
A. 15-20 mu m aqueous automobile intermediate coating (AR-620 8105) sprayed on 100x200mm electrophoresis board, baking strip
Piece (2): 80 ℃ for x3min;
B. spraying 15-20 mu m aqueous automobile finish (AR-3020-1 8X 2), leveling for 3min at 23+ -2deg.C and 65+ -5% humidity, and baking at 80deg.C for 5min;
C. Spraying 30-40 μm varnish (MAC 0-1860-X) on the finish paint, leveling for 7min at 23+ -2deg.C and 65+ -5% humidity, and baking for 20min at 140 deg.C.
Or alternatively
A. Spraying 30-35 μm oily automobile middle coating (OP-5-1 8105) on a 100x200mm electrophoresis board, leveling for 7min under the condition that the temperature is 23+/-2 ℃ and the humidity is 65+/-5%, and baking for 20min under the condition of 140 ℃;
B. Spraying 15-20 mu m aqueous automobile finish (AR-3020-1 8X 2) on the middle layer, leveling for 3min at 23+ -2deg.C and 65+ -5% humidity, and baking for 5min at 80deg.C;
C. Spraying 30-40 μm varnish (MAC 0-1860-X) on the finish paint, leveling for 7min at 23+ -2deg.C and 65+ -5% humidity, and baking for 20min at 140 deg.C.
Test panel cleaning: the test panels were wiped clean with nonwoven and isopropyl alcohol (IPA) prior to testing.
The glass cement coating mode comprises the following steps: and continuously and uniformly coating the glass cement on the surface of the test board in the form of a triangular rubber strip (the bottom of the coated glass cement is 8-12mm, the height is 8-10mm, and the length is 150+/-20 mm), and lightly touching the surface of the test board at the front end of a cement outlet of a cement gun in the coating process, wherein the cement gun is vertical to the surface of the test board.
Coating a glass adhesive tape: two strips of glass cement were applied to both sides of the test plate as shown in fig. 1.
Glass adhesive tape treatment: and (5) flattening the adhesive tape into adhesive tapes with the height of 6+/-1 mm by using a PE film within 5 minutes after the adhesive coating.
The testing process comprises the following steps: ① After the test plate combined with the glass adhesive tape was placed for 168 hours, any one of the two glass adhesive tapes was cut directly along the surface of the paint composite coating using a sharp knife to scratch the paint film of the paint composite coating on the substrate, as shown in fig. 2. Wherein, the direction of glass adhesive tape is cut to the knife is: the angle between the knife and the plate is 60 degrees plus or minus 15 degrees; the cutting point is the joint of the adhesive tape and the plate; cutting the composite coating to the substrate by cutting the composite coating; the cutting length is longer than the width of the glass cement; each cut point is spaced apart by a distance of 10mm while holding the strip evenly forced upward as shown in fig. 2: the included angle between the pulling-out angle and the plate is 90 degrees, at the moment, the pulling force of the glass cement on the composite coating is maximum, and the pulling force between the adhesive tape and the composite coating can be reduced when the angle is too large or too small. The loose end is pulled out until the adhesive strip tears (if the adhesive is not well adhered to the coating, the adhesive strip will be separated from the composite coating). The adhesive strip is then cut again along the substrate and pulled repeatedly until torn again. This procedure was repeated over the whole length of the strip so that the fracture pattern could be clearly assessed.
② The test plate is placed under constant atmosphere 40 ℃/100% relative humidity for 240 hours, and after the test plate is taken out, the second glass cement is subjected to adhesion test between glass cement and paint composite coating in 30 minutes by using a ① test mode.
Description: if air or air pockets in the middle of the strip occur during the evaluation (possibly due to air sealed into the strip during the glue application), this area is not considered for evaluation. If the air area in the adhesive tape is too long (25% of the cut surface is not equal), the adhesion between the adhesive tape and the composite coating cannot be evaluated, and the experiment should be reworked.
After separating the glass adhesive tape from the composite coating by a part each time, observing the morphology of a separation surface on the composite coating, if the separation surface is damaged by less than 50 percent of area, marking the separation surface as qualified, otherwise marking the separation surface as unqualified;
After each separation, the proportion of the total number of qualified fracture surfaces to the total number of fracture surfaces is 30%. It is known that the adhesion between the glazing and the automotive paint is unacceptable and cannot be used in subsequent production applications.
To further verify the accuracy of this conclusion, we performed repeated experiments, with results consistent with the previous conclusions.
It should be understood that the foregoing examples of the present invention are provided merely for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention, and that various other changes and modifications may be made therein by one skilled in the art without departing from the spirit and scope of the present invention as defined by the appended claims.
Claims (9)
1. The method for judging whether the adhesiveness between the glass cement of the vehicle window and the paint of the vehicle is qualified or not is characterized by comprising the following steps:
1) Providing a substrate;
2) Forming a composite coating on the substrate;
3) Coating glass cement on the composite coating and drying to obtain glass cement strips, wherein the number of the glass cement strips is more than 2;
4) Cutting and separating one end of a glass adhesive tape from the composite coating along the joint surface of the glass adhesive tape and the composite coating, so that the glass adhesive tape has a movable end part;
5) Applying an upward force perpendicular to the substrate to the movable end of the glass strip obtained in step 4) so that the glass strip is further separated from the composite coating by at least a portion, and recording the morphology of the separated portion of the composite coating;
6) Cutting along the opening of the joint surface of the glass adhesive tape and the composite coating in the step 5), applying upward force vertical to the substrate to the movable end part of the glass adhesive tape, separating a part of the glass adhesive tape from the composite coating, and recording the morphology of the composite coating of the separated part;
7) Repeating step 6) until the glass adhesive tape is completely separated from the composite coating;
8) Repeating the steps 4) -7), and sequentially separating other glass adhesive tapes from the composite coating;
9) And judging whether the adhesion between the glass cement of the vehicle window and the paint of the vehicle is qualified or not by counting the appearance of the composite coating of the separated part each time.
2. The method of claim 1, wherein in step 2) the composite coating is a basecoat, a topcoat, and a clearcoat disposed in sequence.
3. The method according to claim 1, wherein in the step 3), the glass cement is continuously and uniformly coated on the surface of the composite coating in the form of a triangular rubber strip, wherein the width of the bottom of the coated triangular rubber is 8-12mm, the height is 8-10mm, and the length is 150+/-20 mm;
and then flattening the coated glass cement into glass cement strips with the height of 6+/-1 mm.
4. The method of claim 1, wherein the cutting is performed at an angle of 60 ° ± 15 ° from the substrate and at a depth of the cutting to scratch the composite coating to the substrate.
5. The method of claim 1, wherein in step 4) and step 6), the force is applied in a length such that the glass bead is separated from the composite coating by a length of 10mm to 20mm.
6. The method of claim 1, wherein in step 9), the method for determining whether the adhesion between the glazing and the automotive paint is acceptable by counting the morphology of the composite coating of each divided portion comprises the steps of:
After separating the glass adhesive tape from the composite coating by a part each time, observing the morphology of a separation surface on the composite coating, if the separation surface is damaged by less than 50 percent of area, marking the separation surface as qualified, otherwise marking the separation surface as unqualified;
Counting the qualified times, and counting the total number as m; counting the unqualified times, and counting the total number as n, wherein m and n are positive integers;
if m/m+n is more than 75%, the adhesiveness between the glass cement for the vehicle window and the paint of the vehicle is qualified;
if m/m+n is less than 75%, the adhesion between the glass frit and the paint of the automobile is not qualified.
7. Method according to claim 1, characterized in that in step 1) the substrate is a cold rolled steel sheet for automotive bodies, the dimensions of the substrate preferably being 100x200mm.
8. The method of claim 2, wherein in step 2), the method of forming the composite coating on the substrate comprises the steps of:
Spraying 30-35 mu m aqueous middle coating on a substrate, leveling for 3min at the temperature of 23+/-2 ℃ and the humidity of 65+/-5%, baking for 5min at the temperature of 80 ℃ and baking for 20min at the temperature of 140 ℃;
coating water-based finish paint with the thickness of 15-20 mu m on water, leveling for 3min at the temperature of 23+/-2 ℃ and the humidity of 65+/-5%, and baking for 5min at the temperature of 80 ℃;
spraying varnish with the thickness of 30-40 mu m on the water-based surface paint, leveling for 7min under the conditions of the temperature of 23+/-2 ℃ and the humidity of 65+/-5%, and baking for 20min under the conditions of 140 ℃ so as to form a composite coating on a substrate;
Or alternatively
Spraying 15-20 mu m aqueous intermediate coating on a substrate, and baking under the conditions: 80 ℃ for x3min;
Coating water-based finish paint with the thickness of 15-20 mu m on water, leveling for 3min at the temperature of 23+/-2 ℃ and the humidity of 65+/-5%, and baking for 5min at the temperature of 80 ℃;
spraying varnish with the thickness of 30-40 mu m on the water-based surface paint, leveling for 7min under the conditions of the temperature of 23+/-2 ℃ and the humidity of 65+/-5%, and baking for 20min under the conditions of 140 ℃ so as to form a composite coating on a substrate;
Or alternatively
Spraying 30-35 mu m of oily middle coating on a substrate, leveling for 7min at the temperature of 23+/-2 ℃ and the humidity of 65+/-5%, and baking for 20min at 140 ℃;
The middle coating is sprayed with 15-20 mu m of water-based finish paint, and the water-based finish paint is leveled for 3min under the conditions of the temperature of 23+/-2 ℃ and the humidity of 65+/-5%, and baked for 5min under the condition of 80 ℃;
And (3) spraying varnish with the thickness of 30-40 mu m on the finish paint, leveling for 7min at the temperature of 23+/-2 ℃ and the humidity of 65+/-5%, and baking for 20min at the temperature of 140 ℃ so as to form the composite coating on the substrate.
9. The method of claim 1 wherein the glass cement is an automotive glazing cement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211272301.0A CN117907217A (en) | 2022-10-18 | 2022-10-18 | Method for judging whether adhesion between glass cement of vehicle window and paint of automobile is qualified or not |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211272301.0A CN117907217A (en) | 2022-10-18 | 2022-10-18 | Method for judging whether adhesion between glass cement of vehicle window and paint of automobile is qualified or not |
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| CN117907217A true CN117907217A (en) | 2024-04-19 |
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| CN202211272301.0A Pending CN117907217A (en) | 2022-10-18 | 2022-10-18 | Method for judging whether adhesion between glass cement of vehicle window and paint of automobile is qualified or not |
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| Country | Link |
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| CN (1) | CN117907217A (en) |
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