CN106644785A - Method for testing crack-resistant property of coating on sealant - Google Patents
Method for testing crack-resistant property of coating on sealant Download PDFInfo
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- CN106644785A CN106644785A CN201710070023.3A CN201710070023A CN106644785A CN 106644785 A CN106644785 A CN 106644785A CN 201710070023 A CN201710070023 A CN 201710070023A CN 106644785 A CN106644785 A CN 106644785A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0023—Bending
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0067—Fracture or rupture
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention provides a method for testing crack-resistant property of coating on sealant. The method comprises the following steps of preparing a sealant sample meeting requirements on a clean electrophoresis plate; spraying the coating requiring crack-resistant property testing onto the sealant sample and the electrophoresis plate; baking the sealant sample sprayed with the coating according to preset requirements; putting the baked sealant sample into an environment with preset temperature and humidity; bending the baked sealant sample for at least four times, and respectively obtaining the states of the coating film of the sealant sample at four bending angles; comparing the states of the coating film at four bending angles, and judging the crack-resistant property of the coating on the sealant. The testing method has the advantages that the technology is simple, the method is suitable for industrial production, and the paint crack-resistant property of the coating film on the sealant at different bending angles can be objectively evaluated according to the production requirement..
Description
Technical field
The invention belongs to technical field of coatings, more particularly to a kind of assay method of crack resistance of coating on fluid sealant.
Background technology
At present, in automobile manufacturing process, require because strengthening car body noise isolating, thermal insulating etc., in each part seam crossing of vehicle body
Fluid sealant, putty etc. is usually used to be filled, paint film of coating then is sprayed again, and the ring that this part coatings paint film is applied
Border is with coating paint application is in the environment of vehicle body steel plate and differs.Because the coating paint film being sprayed on fluid sealant and fluid sealant
The difference of the steel plates such as directly contact, and fluid sealant is during being heated or cooling down, the deformation force that paint film is produced and vehicle body
It is very big.Specifically, after fluid sealant is heated, the coefficient of expansion is more much higher than steel plate；And shrink in cooling, coating paint film is in fluid sealant
The upper effect that experienced the power of two processes such as expansion stretching, cooling meat respectively.If the tensile strength of paint film is not high, then
It is very easy in this process split paint.Generally after floating coating ftractures, by drawing crack finish paint and/or priming paint or varnish, so as to make
Integral coating cracking.
And the detection method of existing coating crack resistance mostly by detect coating film electrophoresis plate pliability come between
Connect evaluation, it is common practice that the pliability of paint film is evaluated according to the round bar flexibility of detection coating, so as to evaluate it indirectly
Crack resistance on fluid sealant.But, tensile strength of the coating paint film on fluid sealant bends anti-film breakage with the round bar of paint film
Intensity it is different, cause some coating to reach preferable test value by round bar curved detection, approve that it has very well in theory
Pliability, but after in actual production coating is sprayed on fluid sealant, the expansion of fluid sealant is stretched still by paint film drawing crack.
Additionally, have also to have with the size of Erichsen number to judge the pliability of paint film, but the defect in actual production is still as hereinbefore.
Therefore, the method for testing of crack resistance of the existing coating on fluid sealant is all to go evaluation coating paint film to exist indirectly
Tensile strength on fluid sealant, the tensile force being subject to departing from the expansion on the fluid sealant, during shrinking etc., it is impossible to comment exactly
Valency its anti-paint film on fluid sealant splits the performance of paint.Therefore, there is no at present and efficiently, with gearing to actual circumstances determine coating in fluid sealant
On crack resistance detection method.
In view of this, it is necessary to which a kind of cracking resistance paint that evaluation coating paint film directly can be carried out on fluid sealant is provided
Can such that it is able to evaluate the assay method that anti-paint film of the coating on fluid sealant splits paint performance directly, exactly.
The content of the invention
For the defect of above-mentioned prior art, it is an object of the invention to provide a kind of crack resistance of coating on fluid sealant
Assay method such that it is able to evaluate anti-paint film of the coating on fluid sealant directly, exactly and split paint performance, in solving prior art
The problem of presence.
One aspect of the present invention provides a kind of assay method of crack resistance of coating on fluid sealant, including following step
Suddenly：
Step 1：The fluid sealant sample for meeting preset requirement is prepared on the electrophoresis plate of cleaning；
Step 2：The coating of crack resistance to be determined is sprayed on the fluid sealant sample and electrophoresis plate；
Step 3：The fluid sealant sample after the sprayed coating is toasted by preset requirement；
Step 4：Fluid sealant sample after baking is positioned in the environment of preset temperature and humidity；
Step 5：Fluid sealant sample after the baking is at least carried out into four bendings, and obtains the fluid sealant sample respectively
Coating lacquer membrane stage of this coating paint film under four angle of bend；
Step 6：The coating lacquer membrane stage under four angle of bend is contrasted, judges the coating on the fluid sealant
Crack resistance.
Preferably, the step 1 is further comprising the steps：
By electrophoresis plate degreasing solvent wiped clean, and solvent is allowed to volatilize naturally completely；And
The template of fluid sealant either inking knife absolute ethyl alcohol or degreasing solvent wiped clean is made, according still further to default
Require to be prepared on the electrophoresis plate sealing joint strip or block that meet preset requirement (generally according to the production of actual automobile production manufacturer
The length of the fluid sealant of onsite application, width, thickness parameter are preparing).
Preferably, the fluid sealant sample of the preset requirement is width 40mm, long 90mm, the sealed gluing block of thick 1mm or sealing
Adhesive tape.
Preferably, in the step 2, the coating includes the coating of floating coating or floating coating, finish paint and varnish；It is described
Coating is sprayed by mechanical hand or air cannon, thickness and the preset requirement of the coating paint film that the coating is successively sprayed
Thickness is consistent.
Preferably, in the step 3, the preset requirement is：First pass through 80 DEG C of baking ovens to preheat 5 minutes, preheating is finished
Toast 30 minutes under the conditions of 140 DEG C.
Preferably, in the step 4, the fluid sealant sample after the baking is dry is in the preset temperature and the ring of humidity
At least 4 hours are placed in border.Preferably, the preset temperature and humidity are 23 DEG C of preset temperature, preset relative humidity 65%.
Preferably, in the step 5, the fluid sealant sample from middle bent at least four times, wherein the first time
Angle of bend is less than second angle of bend, and second angle of bend is less than the third time angle of bend, described
Third time angle of bend is less than the 4th angle of bend.
Preferably, in the step 5,45 ° of the first time angle of bend, second 90 ° of angle of bend, third time are curved
135 ° of bent angle, the 4th 180 ° of angle of bend；Every time the fluid sealant sample should place at least 4 hours after bending.
Preferably, the step 6 further includes to contrast the coating paint film, the coating being separately recorded under different angles
The step of paint film state, the paint film state includes the crackle number and depth of the paint film cracking；The fluid sealant sample is curved
Bent angle is set to 45 °, 90 °, 135 °, 180 ° four kinds.
As a result of above-mentioned technical proposal, the present invention has advantages below and beneficial effect：Painting provided by the present invention
The assay method preparation process is simple of crack resistance of the material on fluid sealant, suitable industrialized production；The thickness of fluid sealant, coated film
Thickness can be controlled according to Different field, Production requirement；Can be according to Production requirement, to coating paint film at differently curved angle
Cracking resistance paint on fluid sealant on degree carries out objective determination；The assay method of crack resistance of the coating of the present invention on fluid sealant
Apply also for being measured the coating paint film cracking resistance paint performance in the coatings such as fluid sealant, putty plate.
Specific embodiment
In order to be illustrated more clearly that the present invention, with reference to preferred embodiment, the present invention is described further.Ability
Field technique personnel should be appreciated that following specifically described content is illustrative and be not restrictive, and should not limit this with this
The protection domain of invention.
The assay method of crack resistance of the coating that one embodiment of the present of invention is provided on fluid sealant, including it is following
Step：
Step 1：The fluid sealant sample for meeting preset requirement is prepared on the electrophoresis plate of cleaning；Specifically, first will be described
Electrophoresis plate degreasing solvent wiped clean, and allow solvent to volatilize naturally completely；Then, the template or inking for making fluid sealant
Knife absolute ethyl alcohol or degreasing solvent wiped clean, prepare on the electrophoresis plate according still further to preset requirement and meet preset requirement
Sealing joint strip or block (length of the fluid sealant for generally using according to actual automobile production manufacturer production scene, width, thickness are joined
Count to prepare)；
Step 2：The coating of crack resistance to be determined is sprayed on the fluid sealant sample and electrophoresis plate；During the coating includes
Japanning or the coating of floating coating, finish paint and varnish；The coating is sprayed by mechanical hand or air cannon, described successively to spray
The thickness of the coating paint film of painting is consistent with the thickness of preset requirement.
Step 3：By the fluid sealant sample described in preset requirement baking successively after sprayed coating；The preset requirement is：First
Preheated 5 minutes by 80 DEG C of baking ovens, preheating is finished toasts 30 minutes under the conditions of 140 DEG C.
Step 4：Fluid sealant sample after baking is positioned in the environment of preset temperature and humidity；Specifically, will toast
Fluid sealant sample afterwards is positioned in the environment of preset temperature and humidity 4h (hour) to ensure before bending, fluid sealant sample
Humiture it is consistent with default environment, so as to obtain state S0 of the paint film under without angle of bend (0 °)；The preset temperature and wet
Spend for 23 DEG C of preset temperature, preset relative humidity 65%.
Step 5：Fluid sealant sample after the baking is at least carried out into four bendings, and obtains the coating paint film respectively
Coating lacquer membrane stage S1, S2, S3, S4 under four angle of bend；Wherein described first time angle of bend is less than described
Second angle of bend, second angle of bend is less than the third time angle of bend, and the third time angle of bend is little
In the 4th angle of bend, every time the fluid sealant sample should place at least 4 hours after bending；Specifically, to the baking
The different angles of fluid sealant sample bending after roasting, 45 ° of first time angle of bend, second 90 ° of angle of bend, third time angle of bend
Degree 135 °, the 4th 180 ° of angle of bend, whether observation film has splits paint phenomenon, carries out being curved under low-angle first, curved
Place after song at least 4 hours, angle of bend is then gradually increased again, other angles are identical.
Step 6：State S0～S4 is contrasted, crack resistance of the coating on the fluid sealant is judged：Specifically, it is right
Than the coating paint film, the coating lacquer membrane stage being separately recorded under different angles, the paint film state is opened including the paint film
The crackle number for splitting and depth；The fluid sealant sample angle of bend is set to 45 °, 90 °, 135 °, 180 ° four kinds, and with scene
Fluid sealant angle of bend on vehicle body is contrasted, and cracking resistance paint performance of the coating on fluid sealant is evaluated with this.Preferably,
Fluid sealant angle of bend on the live vehicle body is also configured as 45 °, 90 °, 135 °, 180 ° four kinds.
Embodiment 1：Assay method by crack resistance of the coating of the present invention on fluid sealant is existing to the first vehicle spray painting
The floating coating that field uses carries out the measure of crack resistance of the coating on fluid sealant.
In the present embodiment, the preset temperature of the test environment is 23 DEG C, presets relative humidity 65%, the painting to be tested
Expect for the aqueous primer surfacer at first vehicle spray painting scene.
Step 1：Prepare on the electrophoresis plate of cleaning and meet the fluid sealant sample for specifying requirement：Specifically, according to this enforcement
The use processing step at the first vehicle spray painting scene described in example, the electrophoresis that post coat is required, used first automobile
Plate, template etc. are thoroughly cleaned, and wide 40mm, long 90mm, the sealed gluing block of thick 1mm are then made on the electrophoresis plate.
Step 2：The coating of crack resistance to be determined is sprayed on the fluid sealant sample and electrophoresis plate, the coating is described
The aqueous primer surfacer at the first vehicle spray painting scene；Specifically, the aqueous primer surfacer at the first vehicle spray painting scene passes through machine
Hand or air cannon are sprayed, and the thickness of the coating paint film of the spraying is consistent with the thickness of preset requirement；In the present embodiment
In, the thick floating coatings of 35um, levelling 5 minutes are sprayed on the sealed gluing block.
Step 3：Fluid sealant sample by the spraying floating coating and after levelling first passes through 80 DEG C of baking ovens and preheats 5 minutes, in advance
Heat is finished toasts 30 minutes under the conditions of 140 DEG C, then takes out nature and is cooled to room temperature.
Step 4：Fluid sealant sample after baking is positioned over into preset temperature for 23 DEG C, the environment of relative humidity 65% is preset
In, to obtain state S0 of the coating paint film under without angle of bend；Specifically, the fluid sealant sample by baking after dry is default
Temperature is 23 DEG C, presets in the environment of relative humidity 65% and places 4 hours, observes state S0 of the film under without angle of bend.S0 shapes
State be without bending in the case of state of the paint film on fluid sealant, generally corresponding is at vehicle body plane.State S0 etc.
Blank state is same as, is that the state under bending afterwards therewith is contrasted.Wherein, the paint film state is including the paint film
No cracking, and the crackle number and depth of cracking.
Step 5：Fluid sealant sample after the baking is at least carried out into four bendings, and obtains the coating paint film respectively
Coating lacquer membrane stage S1 (model bends 45 ° with coating) under four angle of bend, (model and coating bend S2
90 °), S3 (model and coating bend 135 °), S4 (model and coating bend 180 °), wherein the first time angle of bend
Less than second angle of bend, second angle of bend is less than the third time angle of bend, and the third time is curved
Bent angle is less than the 4th angle of bend, and every time the fluid sealant sample should place at least 4 hours after bending；Specifically,
To the fluid sealant sample middle bent after the baking, 45 ° of first time angle of bend, second 90 ° of angle of bend, third time are curved
135 ° of bent angle, the 4th 180 ° of angle of bend, film is observed respectively splits paint phenomenon, every time the fluid sealant sample after bending
At least 4 hours should be placed.
Step 6：State S0～S4 is contrasted, crack resistance of the coating on the fluid sealant is judged：Specifically, it is right
Recorded than coating lacquer membrane stage of the coating paint film under different angles, state S1 during 45 ° of first time angle of bend
For flawless, paint film is intact；During 90 ° of second angle of bend state S2 is flawless or splits paint, paint film is intact；It is curved for the third time
State S3 during 135 ° of bent angle is that without splitting paint, paint film is intact；State S4 after 4th 180 ° of angle of bend is tiny to occur
Crackle, afterwards crackle gradually expands to place 1 hour (h), places crackle after 24h and does not continue to expand.
Embodiment 2：Several different coating are existed by the assay method of crack resistance of the coating of the present invention on fluid sealant
Crack resistance comparative evaluation on fluid sealant：Specially the second vehicle spray painting scene take five kinds it is different, but be the water of black
Property floating coating carries out the crack resistance evaluation of paint film on identical fluid sealant.
In the present embodiment, the preset temperature of the test environment is 23 DEG C, presets relative humidity 65%, the painting to be tested
Expect different for four kinds, but be the aqueous primer surfacer of black.
Step 1：Prepare on the electrophoresis plate of cleaning and meet five parts of fluid sealant samples for specifying requirement：Specifically, foundation
Described in the present embodiment the second vehicle spray painting scene use processing step, post coat require, to the electrophoresis plate, template etc.
Thorough cleaning, then makes on the electrophoresis plate respectively four pieces of wide 40mm, long 90mm, the sealed gluing block of thick 1mm.The sealing
Glue sample is respectively labeled as 1#, 2#, 3# and 4#, 5#.
Step 2：Sprayed coating, the painting on 1#, 2#, 3#, 4# and 5# fluid sealant sample and electrophoresis plate respectively
Material includes the aqueous primer surfacer at the second vehicle spray painting scene, and the aqueous primer surfacer at the second vehicle spray painting scene passes through
Mechanical hand or air cannon are sprayed, and the thickness of the coating paint film of the spraying is consistent with the thickness of preset requirement；At this
In embodiment, the thick floating coatings of 35um, levelling 5 minutes are sprayed on described 1#, 2#, 3# and 4#, 5# sealed gluing blocks respectively.
Step 3：1#, 2#, 3# and 4# after the spraying floating coating simultaneously levelling, 5# fluid sealant sample standard deviations are first passed through into 80 DEG C
Baking oven is preheated 5 minutes, and preheating is finished toasts 30 minutes under the conditions of 140 DEG C, then takes out nature and is cooled to room temperature.
Step 4：1#, 2#, 3# and 4# after baking, 5# fluid sealant samples are placed in into preset temperature for 23 DEG C, are preset
In the environment of relative humidity 65%, to obtain state S0, S0', S0 of the coating paint film under without angle of bend respectively ", S0 " ',
S0””；Specifically, to baking after dry 1#, 2#, 3# and 4#, 5# fluid sealant samples are placed on preset temperature for 23 DEG C, preset phase
To 4 hours in the environment of humidity 65%, observe state S0, S0', the S0 of four parts of films under without angle of bend ", S0 " ', S0 " ".Its
In, paint film state S0, S0', S0 ", S0 " ', S0 " " whether ftracture including the paint film respectively, and cracking crackle number
Mesh and depth.
Step 5：Respectively 1#, 2#, 3# and the 4# after the baking, 5# fluid sealants sample are at least carried out into four bendings, and
The coating lacquer of described 1#, 2#, 3# and 4#, the coating paint film on 5# fluid sealant samples under four angle of bend is obtained respectively
Membrane stage S1, S2, S3, S4, S1', S2', S3', S4', S1 ", S2 ", S3 ", S4 ", S1 " ', S2 " ', S3 " ', S4 " ', S1 " ",
S2””、S3””、S4””.First time angle of bend described in wherein every piece fluid sealant sample is less than second angle of bend, institute
Second angle of bend is stated less than the third time angle of bend, the third time angle of bend is less than the 4th angle of bend
Degree, every time the fluid sealant sample standard deviation should place at least 4 hours after bending；Specifically, to 1#, 2#, the 3# after the baking and
4#, 5# fluid sealant sample middle part is curved, first time angle of bend be 45 °, second angle of bend be 90 °, the 3rd
Secondary angle of bend be 135 °, the 4th angle of bend be 180 °, the film of five pieces of fluid sealant samples of observed and recorded respectively
Paint phenomenon is split, every time described 1#, 2#, 3# and 4#, 5# fluid sealants sample standard deviation should place at least 4 hours after bending.
Step 6：State S0～S4, S0'～S4', S0 are contrasted respectively "～S4 ", S0 " '～S4 " ', S0 " "～S4 " ",
Judge crack resistance of the five kinds of coating on described 1#, 2#, 3# and 4#, five pieces of fluid sealant samples of 5#.Specifically, to the painting
Coating lacquer membrane stage of the material paint film under different angles is recorded, please refer to table 1.
The state of described 1#, 2#, 3# and 4#, 5# fluid sealant sample paint films when angle of bend is 0 ° be respectively S0, S0',
The original state of S0 ", S0 " ', S0 " ", paint film is complete, and without cracking, then the coating of the fluid sealant sample paint film is on fluid sealant
The situation of paint film cracking will not be produced when using under conditions of 0 ° of bending.
State S1 during 45 ° of the 1# fluid sealants sample paint film first time angle of bend is flawless, and paint film is intact；Second
State S2 during 90 ° of secondary angle of bend is without flawless, and paint film is intact；State S3 flawless during 135 ° of third time angle of bend,
Paint film is intact；There are fine cracks in state S4 during 180 ° of the 4th angle of bend, and afterwards crackle gradually expands to place 1 hour (h),
Place crackle after 24h not continuing to expand.
State S1' flawless during 45 ° of the 2# fluid sealants sample paint film first time angle of bend, paint film is intact；Second
State S2' flawless during 90 ° of secondary angle of bend, paint film is intact；State S3' flawless during 135 ° of third time angle of bend,
Paint film is intact；There are fine cracks in state S4' during 180 ° of the 4th angle of bend, and crackle number is 2, places 1 hour (h)
Afterwards crackle gradually expands, and places crackle after 24h and does not continue to expand.
State S1 during 45 ° of the 3# fluid sealants sample paint film first time angle of bend " flawless, paint film is intact；Second
, without flawless, paint film is intact for state S2 during 90 ° of secondary angle of bend "；State S3 during 135 ° of third time angle of bend " occurs thin
Crackle, crackle number is 2；Crackle number increases state S4 during 180 ° of the 4th angle of bend " is 6 articles, places 1 hour
H () afterwards crackle gradually expands, place crackle after 24h and do not continue to expand.
State S1 during 45 ° of the 4# fluid sealants sample paint film first time angle of bend " ' flawless, paint film is intact；Second
State S2 during 90 ° of secondary angle of bend " ' there are fine cracks, crackle number is 2；Shape during 135 ° of third time angle of bend
State S3 " ' crackle number increase be 6；State S4 during 180 ° of the 4th angle of bend " ' crackle number increases is 7 articles, places 1
Afterwards crackle gradually expands hour (h), places crackle after 24h and does not continue to expand.
There is crackle in state S1 during 45 ° of the 5# fluid sealants sample paint film first time angle of bend " ", and crackle number is 1
Bar；Crackle number increases state S2 during 90 ° of second angle of bend " " is 2；State during 135 ° of third time angle of bend
It is 6 that the crackle number of S3 " " increases；Crackle number increases state S4 during 180 ° of the 4th angle of bend " " is 7 articles, places 1
Afterwards crackle gradually expands hour (h), places crackle after 24h and does not continue to expand.
Crackle when crackle no longer changes, to coating surface on described 1#, 2#, 3# and 4#, five pieces of fluid sealant samples of 5#
Quantity, size, deep narrow etc. carry out comparative evaluation.Wherein, when the fluid sealant sample paint film bending 45 °, 90 °, 135 ° and
Paint film is respectively under 180 ° of states complete, during without cracking, then provable coating to be measured makes under conditions of 45 ° of bending on fluid sealant
Used time does not result in the situation of paint film cracking.Conversely, being respectively paint film cracking under 45 °, 90 °, 135 ° and 180 ° states, split
Line bar counts number now as shown in table 1 below, and crack depth is deeper, and paint film cross-linked network state is by drawing crack, then provable to treat
Survey coating crack resistance time or poor on experiment fluid sealant.
When different coating to be measured with same fluid sealant when experiments supporting is carried out, the fluid sealant sample of the coating to be measured
There is the situation of paint film cracking when bending is to same angle in paint film, then the paint film by contrast under same flexure angle splits
Line bar number, depth judge, crackle bar number less, crack depth it is less, then the crack resistance of coating is good, otherwise crack resistance take second place or
Difference.
Evaluation method specifically refers to table 1 below：
Table 1
The present invention other embodiment specific evaluation method in, it is also an option that according to bending plate face angle,
The several respects such as crack number, the depth of appearance carry out comparative evaluation.
Contrasted by the example of upper table 1, it can be seen that 1# fluid sealants sample is at 0 °, 45 °, 90 °, 135 °, multiple angles such as 180 °
Under degree, the coating paint film on fluid sealant is covered in without cracking situation, illustrate that 1# coating cracking resistance on fluid sealant is excellent.2#
, there is 2 Cracks, explanation under 180 ° of case of bendings in fluid sealant sample paint film flawless under 0 °, 45 °, 90 °, 135 ° of angles
Cracking resistance of the 2# coating on fluid sealant is not so good as 1# coating.In the same manner, contrasted item by item with this parameter, can be determined, same
Plant crack resistance performance on fluid sealant as follows：The coating paint film crack resistance of the 1# fluid sealants sample is optimum, the 2# fluid sealants sample
This coating paint film crack resistance is taken second place, the coating paint film crack resistance of the 3# fluid sealants sample third, the 4# fluid sealants sample
Third, the coating paint film crack resistance of the 5# fluid sealants sample is worst for this coating paint film crack resistance.
As a result of above-mentioned technical proposal, the present invention has advantages below and beneficial effect：Painting provided by the present invention
The assay method preparation process is simple of crack resistance of the material on fluid sealant, suitable industrialized production；The thickness of fluid sealant, coated film
Thickness can be controlled according to Different field, Production requirement；Can be according to Production requirement, to coating paint film at differently curved angle
Cracking resistance paint on fluid sealant on degree carries out objective determination；The assay method of crack resistance of the coating of the present invention on fluid sealant
Apply also for being measured the coating paint film cracking resistance paint performance in the coatings such as fluid sealant, putty plate.
Obviously, the above embodiment of the present invention is only intended to clearly illustrate example of the present invention, and is not right
The restriction of embodiments of the present invention, for those of ordinary skill in the field, may be used also on the basis of the above description
To make other changes in different forms, the embodiment that the present invention is enumerated cannot give all of embodiment thoroughly
To the greatest extent, it is every to belong to the obvious change or change still in protection model of the invention that technical scheme extends out
The row for enclosing.The all documents for referring in the present invention all in this application be incorporated as reference, as same piece document it is independent
It is cited as with reference to such.
Claims (10)
1. the assay method of crack resistance of a kind of coating on fluid sealant, it is characterised in that：Comprise the following steps：
Step 1：The fluid sealant sample for meeting preset requirement is prepared on the electrophoresis plate of cleaning；
Step 2：The coating of crack resistance to be determined is sprayed on the fluid sealant sample and electrophoresis plate；
Step 3：The fluid sealant sample after the sprayed coating is toasted by preset requirement；
Step 4：Fluid sealant sample after baking is positioned in the environment of preset temperature and humidity；
Step 5：Fluid sealant sample after the baking is at least carried out into four bendings, and obtains the fluid sealant sample respectively
Coating lacquer membrane stage of the coating paint film under four angle of bend；
Step 6：The coating lacquer membrane stage under four angle of bend is contrasted, judges that the coating is anti-on the fluid sealant
Fragility.
2. the assay method of crack resistance of the coating according to claim 1 on fluid sealant, it is characterised in that：The step
1 is further comprising the steps：
By electrophoresis plate degreasing solvent wiped clean, and solvent is allowed to volatilize naturally completely；And
The template of fluid sealant either inking knife absolute ethyl alcohol or degreasing solvent wiped clean is made, according still further to preset requirement
The sealing joint strip or block for meeting preset requirement is prepared on the electrophoresis plate.
3. the assay method of crack resistance of the coating according to claim 1 on fluid sealant, it is characterised in that：It is described default
The fluid sealant sample of requirement be width 40mm, the sealed gluing block or sealing joint strip of long 90mm, thick 1mm.
4. the assay method of crack resistance of the coating according to any one of claim 1-3 on fluid sealant, it is characterised in that：
In the step 2, the coating includes the coating of floating coating or floating coating, finish paint and varnish；The coating by mechanical hand or
Person's air cannon is sprayed, and the thickness of the coating paint film that the coating is successively sprayed is consistent with the thickness of preset requirement.
5. the assay method of crack resistance of the coating according to any one of claim 1-3 on fluid sealant, it is characterised in that：
In the step 4, it is little that the fluid sealant sample after the baking is dry places at least 4 in the preset temperature with the environment of humidity
When.
6. the assay method of the crack resistance according to the coating described in claim 1 on fluid sealant, it is characterised in that：The step 5
In, the fluid sealant sample is from middle bent at least four times, wherein the first time angle of bend bends less than described second
Angle, second angle of bend is less than the third time angle of bend, and the third time angle of bend is less than the described 4th
Secondary angle of bend.
7. the assay method of crack resistance of the coating according to claim 6 on fluid sealant, it is characterised in that：Described first
45 ° of secondary angle of bend, second 90 ° of angle of bend, 135 ° of third time angle of bend, the 4th 180 ° of angle of bend；It is curved every time
The fluid sealant sample should place at least 4 hours after song.
8. the assay method of crack resistance of the coating according to any one of claim 1-3 on fluid sealant, it is characterised in that：
In the step 3, the preset requirement is：First pass through 80 DEG C of baking ovens to preheat 5 minutes, preheating is finished dries under the conditions of 140 DEG C
It is roasting 30 minutes.
9. the assay method of crack resistance of the coating according to claim 5 on fluid sealant, it is characterised in that：The step
Preset temperature and humidity are 23 DEG C of preset temperature in 4, preset relative humidity 65%.
10. the assay method of crack resistance of the coating according to claim 6 or 7 on fluid sealant, it is characterised in that：It is described
Step 6 further includes to contrast the coating paint film, described the step of the coating lacquer membrane stage being separately recorded under different angles
Paint film state includes the crackle number and depth of the paint film cracking；The fluid sealant sample angle of bend be set to 45 °, 90 °,
135 °, 180 ° four kinds.
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