KR20080102840A - Apparatus for valuation of anti-solvent property with paint for automobile - Google Patents

Apparatus for valuation of anti-solvent property with paint for automobile Download PDF

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Publication number
KR20080102840A
KR20080102840A KR1020070049810A KR20070049810A KR20080102840A KR 20080102840 A KR20080102840 A KR 20080102840A KR 1020070049810 A KR1020070049810 A KR 1020070049810A KR 20070049810 A KR20070049810 A KR 20070049810A KR 20080102840 A KR20080102840 A KR 20080102840A
Authority
KR
South Korea
Prior art keywords
solvent
coating film
storage tank
resistance evaluation
solvent resistance
Prior art date
Application number
KR1020070049810A
Other languages
Korean (ko)
Inventor
김상균
Original Assignee
현대자동차주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 현대자동차주식회사 filed Critical 현대자동차주식회사
Priority to KR1020070049810A priority Critical patent/KR20080102840A/en
Publication of KR20080102840A publication Critical patent/KR20080102840A/en

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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
    • 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
    • G01N3/40—Investigating hardness or rebound hardness
    • G01N3/42—Investigating hardness or rebound hardness by performing impressions under a steady load by indentors, e.g. sphere, pyramid
    • G01N3/46—Investigating hardness or rebound hardness by performing impressions under a steady load by indentors, e.g. sphere, pyramid the indentors performing a scratching movement
    • 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
    • G01N2203/0076—Hardness, compressibility or resistance to crushing
    • G01N2203/0078—Hardness, compressibility or resistance to crushing using indentation
    • 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
    • G01N2203/04—Chucks, fixtures, jaws, holders or anvils

Abstract

The present invention relates to an apparatus for evaluating solvent resistance of an automotive coating film, and more particularly, by using calcite having a firmness such as nails, it is possible to secure objectivity for the hardness of nails slightly different for each tester during solvent resistance evaluation. The present invention relates to an apparatus for evaluating the solvent resistance of a coating film for automobiles which performs a test under a constant load and maintains a constant amount of solvent loaded on the coating film.

To this end, the present invention is a coating film specimen subject to solvent resistance evaluation; A solvent storage tank in which a predetermined amount of solvent is dropped on the coating film specimen and installed in parallel at a predetermined interval; Scratch jig is slidably coupled between the solvent storage tank, the scratch jig while maintaining a constant load on the coating film specimen; It is mounted on the scratch jig provides a weight resistance to maintain a constant load; provides a solvent resistance evaluation device for a coating film for automobiles, characterized in that configured to include.

Description

Apparatus for valuation of anti-solvent property with paint for automobile}

1 is a perspective view showing a solvent resistance evaluation apparatus of the automotive coating according to an embodiment of the present invention,

Figure 2 is a side view showing the operating state of the solvent storage tank of Figure 1,

3a and 3b is a front view and a side view showing a jig for scratching according to an embodiment of the present invention,

4 is a perspective view showing a solvent storage tank according to an embodiment of the present invention,

5 is a plan view for explaining the operating state of FIG.

<Description of the symbols for the main parts of the drawings>

10: calcite 11: weight

12: dissolving solvent 13: silk batting

14: jig for scratch 14a: support stand

14b: vertical bar 14c: guide bar

14d: support 15: base plate

16: solvent storage tank 17: guide hole

18: solvent inlet 19: coating film specimen

20: cotton cloth 21: hinge pin

The present invention relates to an apparatus for evaluating solvent resistance of an automotive coating film, and more particularly, by using calcite having a firmness such as nails, it is possible to secure objectivity for the hardness of nails slightly different for each tester when evaluating solvent resistance. The present invention relates to an apparatus for evaluating the solvent resistance of a coating film for automobiles which performs a test under a constant load and maintains a constant amount of solvent loaded on the coating film.

In general, the sensitization quality of the outer shell coating film for vehicles should have physical properties, that is, solvent resistance, to withstand not only gloss and color, but also external solvents. Doing.

In more detail, the method for testing the solvent resistance is placed on a cotton cloth with a solvent on the test film more than one day after the production, and scratched four times with nails every 2 minutes with a force of 2 kg.

The test coating film was scratched with the tester's fingernail and the time when the lower coating film surface appeared was recorded.

The test method as described above has the following problems.

First, it is not easy to find exactly the same place to scratch the tester's fingernails.

In other words, after scratching the first four times, you should lift the cotton cloth and check the abnormality of the test coating, and immediately cover the cotton cloth and scratch the same place one minute later. It is virtually impossible.

Second, it is also impossible to apply the force of 2㎏ using nails.

That is, since the results of the test may be different depending on the force of scratching with the finger of the tester, there is a problem that the results may be different for each test depending on the tester and the same tester.

Third, there are many problems in securing the objectivity of the test in the situation where the evaporation rate of xylene dropped on the cotton cloth is different for each season or temperature.

The present invention has been made in view of the above, as a jig made of calcite (3 degrees) forming a grade such as nails (2.5-3 degrees) in Moss firm machine for nail hardness of slightly different for each tester To ensure objectivity and to perform tests with a certain amount of load using weights, the amount of solvent (xylene) dipped in the coating film can be kept constant, thereby reducing test errors that may occur during solvent resistance evaluation. The purpose of the present invention is to provide a solvent resistance evaluation apparatus for automotive coatings that can be reduced.

In the present invention for achieving the above object in the solvent resistance evaluation apparatus of the coating film for automobiles,

Coating specimens subject to solvent resistance evaluation; A solvent storage tank in which a predetermined amount of solvent is dropped on the coating film specimen and installed in parallel at a predetermined interval; Scratch jig is slidably coupled between the solvent storage tank, the scratch jig while maintaining a constant load on the coating film specimen; And a weight that is mounted to the scratch jig to maintain a constant load.

In a preferred embodiment, the solvent storage tank is a guide hole formed to be movable in the longitudinal direction on both sides of the upper, a plurality of solvent dropping port formed at regular intervals on the bottom, the solvent inlet formed on the front surface, and the filling cotton pad It includes, and after the solvent inlet through the solvent inlet to wet the pongee, characterized in that a certain amount of solvent to drop the coating film specimen through the solvent inlet.

In a more preferred embodiment, the solvent storage tank is coupled to the bottom end of the front end by a hinge pin on the base plate is rotated in the vertical direction of the rear end of the tank, the coating film on the base plate in the state of raising the rear end of the tank up And the solvent storage tank is lowered back to its original position.

In addition, the scratch jig is a support for supporting the weight, the guide bar which is formed in the horizontal direction from the lower portion of the weight support and penetrates the front and rear direction through the guide hole, the support formed on the lower portion of the guide bar And a calcite which is supported by the support when the guide bar is moved and which scratches the coating film specimen under a constant load.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view illustrating a solvent resistance evaluation apparatus for an automotive coating film according to an embodiment of the present invention, and FIG. 2 is a side view showing an operating state of the solvent storage tank of FIG. 1.

3A and 3B are a clear view and a side view showing a scratch jig according to an embodiment of the present invention, Figure 4 is a perspective view showing a solvent storage tank according to an embodiment of the present invention.

The present invention is to solve the problems caused by the difference between the strength of each tester nail strength and the pressure to press the coating film and the amount of solvent applied to the coating film that can occur when the solvent resistance evaluation.

Therefore, the present invention drips 12 dropping the calcite 10 applied to the same hardness in place of the tester's fingernail, the weight weight 11 that can be applied a constant size load and a certain amount of solvent on the coating film surface ) And a pongee 13.

Apparatus for evaluating the solvent resistance of an automotive coating film according to an embodiment of the present invention is a scratch jig 14 for applying a scratch to the coating film surface with a constant strength, and the base plate 15 of a predetermined area across the jig It consists of a solvent storage tank (16) installed parallel to.

The scratch jig 14 for applying a load on the coating film surface has a support 14a for mounting the weight 11 on the upper portion, a vertical bar 14b formed downward from the support and the middle of the vertical rod It is composed of a guide bar 14c formed in both sides in the side portion and a support 14d supporting the calcite 10 at the lower end of the vertical rod 14b.

The support 14a has an area of a suitable size to put a combination of weights 11 of different sizes, the guide bar 14c is free to move the scratch jig 14 in the horizontal direction. To make sure.

The calcite 10 (Mos firmness; 3) is similar to the nail firmness (2.5-3) in the Mohs hard machine, which is a part directly in contact with the coating film surface, and protrudes through the lower end of the support 14d while the jig is moved. The lower end has a pointed shape to scratch the coating surface.

The solvent storage tank 16 is installed in a rectangular shape parallel to the base plate 15 at regular intervals, the lower end portion of one side is hinged to the other side is installed in a structure capable of rotating in the vertical direction.

The upper end of the rectangular body supports the support 14a of the scratch jig 14, guide holes 17 are formed in the longitudinal direction on both sides of the upper part of the jig, and the solvent dripping holes 12 at regular intervals on the bottom of the tank. ) Is formed, and a solvent inlet 18 through which a solvent can be introduced is formed at the lower part of the front surface of the tank.

The guide bar 14c is inserted into both sides through the guide hole 17, and a silk pad is formed in the lower portion of the rectangular shape so that the solvent is dropped into the coating film specimen 19 in a predetermined amount through the solvent inlet 12. 13) is filled, and when the solvent is introduced through the solvent inlet 18 is installed in a structure that the solvent is soaked in the silk batting (13).

That is, the evaluation device is a jig 14 running between two solvent storage tanks 16 (rectangular) containing a solvent (xylene) as a polypropylene injection molding to maintain a constant load by the weight (11) It is installed in a structure in which a load is applied to the coating film, and the solvent is dripped downward by a certain amount by the pongee 13 soaking the solvent inside the solvent storage tank 16.

Referring to the method of using the solvent resistance evaluation apparatus for automotive coating film according to the present invention by such a configuration as follows.

5 is a plan view for explaining the operating state of FIG.

First, a weight of 11 kg (11) is put on the support, lift one end of the solvent storage tank (16) and put the coating film specimen (19) on the base plate 15 on the cotton cloth (gauze; 20) Cover, and then lower the solvent storage tank (16) to its original position.

At this time, the solvent is introduced through the solvent inlet 18 to wet the silk batting 13, and the cotton cloth 20 is wetted through the dripping opening 12 to drop a predetermined amount of solvent onto the coating film surface, and then the jig for scratching ( Hold the guide bar (14c) of 14) by hand and proceed 4 times from side to side to scratch. After that, repeat every 1 minute and record the time the lower coating surface appears.

By this method, the present invention improves the problem that an incorrect load and nail strength may occur for each tester by using the scratch jig 14 having a constant load and a constant firmness, and the degree of the solvent dropping on the coating film. Can be kept constant to ensure objectivity and accuracy of the test and to avoid wasting money on retesting.

While the invention has been shown and described with respect to certain preferred embodiments thereof, the invention is not limited to these embodiments, and has been claimed by those of ordinary skill in the art to which the invention pertains. It includes all the various forms of embodiments that can be carried out without departing from the spirit.

As described above, according to the solvent resistance evaluation apparatus of the automotive coating film according to the present invention, by using a scratch jig having a constant load and a certain firmness, there is a problem that inaccurate load and nail strength may occur for each tester It can be improved, and the pongee cotton containing the solvent inside maintains the degree of solvent solvent dropping on the coating film to ensure the objectivity and accuracy of the test and prevent waste of the cost of the retest.

Claims (4)

In the solvent resistance evaluation apparatus of the automotive coating film, Coating specimens subject to solvent resistance evaluation; A solvent storage tank in which a predetermined amount of solvent is dropped on the coating film specimen and installed in parallel at a predetermined interval; Scratch jig is slidably coupled between the solvent storage tank, the scratch jig while maintaining a constant load on the coating film specimen; A weight which is mounted on the scratch jig to maintain a constant load; Solvent resistance evaluation device for a coating film for automobiles, characterized in that configured to include. The method according to claim 1, The solvent storage tank includes a guide hole formed to be movable in the longitudinal direction on both sides of the upper portion, a plurality of solvent dropping holes formed at regular intervals on the bottom surface, a solvent inlet formed on the front surface, and a pongee pad filled therein. Solvent resistance evaluation device for a automotive coating film, characterized in that the solvent is injected through the solvent inlet to wet the pongee, and a certain amount of solvent is added to the coating film specimen through the solvent inlet. The method according to claim 2, The solvent storage tank is coupled to the lower end of the front end by the hinge pin 21 on the base plate to rotate the rear end of the tank in the vertical direction, the coating film specimen is disposed on the base plate in a state in which the rear end of the tank is raised up Solvent resistance evaluation device for a coating film for cars, characterized in that lowering the solvent storage tank back to the original position. The method according to claim 2, The scratch jig is a support for supporting the weight, the guide bar is formed in the horizontal direction in the lower portion of the support and moving through the guide hole in the front and rear direction, the support formed in the lower portion of the guide bar, Moving the guide bar is supported by the support and the solvent resistance evaluation device for a coating film for automobiles, characterized in that it comprises a calcite to scratch the coating film specimen with a constant load.
KR1020070049810A 2007-05-22 2007-05-22 Apparatus for valuation of anti-solvent property with paint for automobile KR20080102840A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020070049810A KR20080102840A (en) 2007-05-22 2007-05-22 Apparatus for valuation of anti-solvent property with paint for automobile

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020070049810A KR20080102840A (en) 2007-05-22 2007-05-22 Apparatus for valuation of anti-solvent property with paint for automobile

Publications (1)

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KR20080102840A true KR20080102840A (en) 2008-11-26

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107884295A (en) * 2017-10-18 2018-04-06 林敏� A kind of nailing nail tip hardness quick determination method
KR20190126486A (en) * 2018-05-02 2019-11-12 주식회사 포스코 Drawing unit and coating test apparatus having thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107884295A (en) * 2017-10-18 2018-04-06 林敏� A kind of nailing nail tip hardness quick determination method
KR20190126486A (en) * 2018-05-02 2019-11-12 주식회사 포스코 Drawing unit and coating test apparatus having thereof

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