Unlock instant, AI-driven research and patent intelligence for your innovation.

A method for measuring the crack resistance of coatings on sealants

A determination method and technology of sealant, applied in the field of coatings, can solve the problems of different strengths, detachment tensile force, cracking of paint films, etc., and achieve the effect of simple preparation process

Active Publication Date: 2019-05-03
LANGFANG NIPPON PAINT
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the tensile strength of the paint film on the sealant is different from the strength of the film's round rod bending anti-breaking film, which leads to some coatings reaching the ideal test value through the round rod bending test, which is theoretically recognized to have good Flexibility, but after the paint is sprayed on the sealant in actual production, the expansion and stretching of the sealant will still tear the paint film
In addition, the flexibility of the paint film is judged by the size of the cupping value, but the defects in actual production are still the same as the above
[0004] Therefore, the existing test methods for the crack resistance of coatings on sealants all indirectly evaluate the tensile strength of paint films on sealants, and are separated from the tensile strength received during the expansion and contraction of sealants. Stretch force, cannot accurately evaluate its anti-paint film cracking performance on the sealant
Therefore, there is currently no efficient and practical test method for measuring the crack resistance of coatings on sealants

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for measuring the crack resistance of coatings on sealants
  • A method for measuring the crack resistance of coatings on sealants

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: Carry out the measurement of the anti-cracking property of the coating on the sealant by the measurement method of the crack resistance of the coating on the sealant of the present invention to the intermediate paint used in the first automobile spraying site.

[0034] In this embodiment, the preset temperature of the test environment is 23° C., and the preset relative humidity is 65%, and the paint to be tested is the water-based intermediate paint at the first automobile spraying site.

[0035] Step 1: Prepare a sealant sample that meets the specified requirements on a clean electrophoresis plate: specifically, according to the use process steps of the first car spraying site described in this embodiment, the site coating requirements, and the use of the first car Thoroughly clean the electrophoresis plate, template, etc., and then make a sealant block with a width of 40 mm, a length of 90 mm, and a thickness of 1 mm on the electrophoresis plate.

[0036...

Embodiment 2

[0041] Embodiment 2: by the measuring method of the anti-cracking property of coating on sealant of the present invention, to the comparative evaluation of the anti-cracking property of several different coatings on sealant: be specifically to get five kinds of different in the second automobile spraying scene, However, the crack resistance evaluation of the paint film is carried out on the same sealant for the black water-based intermediate paint.

[0042] In this embodiment, the preset temperature of the test environment is 23° C., and the preset relative humidity is 65%. The paints to be tested are four different, but all are black water-based intermediate paints.

[0043] Step 1: Prepare five sealant samples that meet the specified requirements on a clean electrophoresis plate: specifically, according to the process steps of the second automobile spraying site described in this embodiment, the on-site coating requirements, the electrophoresis Plates, templates, etc. are th...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a method for measuring the crack resistance of a coating on a sealant, comprising the steps of: preparing a sealant sample meeting preset requirements on a clean electrophoresis plate; Determination of crack resistance coating; according to preset requirements to bake the sealant sample after spraying the paint; place the baked sealant sample in an environment with preset temperature and humidity; place the baked sealant sample The glue sample is bent four times, and the paint film state of the paint film of the sealant sample is obtained under the four bending angles respectively; compared with the paint film state under the four bending angles, it is judged that the The crack resistance of the paint on the sealant. The measuring method provided by the invention has a simple process, is suitable for industrial production, and can objectively evaluate the paint cracking resistance of paint films on sealants with different bending angles according to production requirements.

Description

technical field [0001] The invention belongs to the technical field of coatings, in particular to a method for measuring the crack resistance of coatings on sealants. Background technique [0002] At present, in the automobile manufacturing process, due to the requirements of strengthening the noise insulation and heat insulation of the car body, the joints of various parts of the car body are usually filled with sealant, putty, etc., and then sprayed with paint film, and this part of the paint The environment in which paint films are applied is not the same as the environment in which paint sprays are applied to body panels. Because the paint film sprayed on the sealant is in direct contact with the sealant, and the deformation force of the sealant on the paint film during heating or cooling is very different from that of steel plates such as car bodies. Specifically, after the sealant is heated, its expansion coefficient is much higher than that of the steel plate; while ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/32
CPCG01N3/32G01N2203/0005G01N2203/0023G01N2203/0067G01N2203/0682
Inventor 梅鹏杨秋红
Owner LANGFANG NIPPON PAINT