阅读说明：本技术 一种基于液滴运动轨迹的涂层均匀性测试装置及测试方法 (Coating uniformity testing device and method based on liquid drop motion track ) 是由 朱宇帆 张振亚 张一获 周继彪 于 2020-05-12 设计创作，主要内容包括：本发明公开了一种基于液滴运动轨迹的涂层均匀性测试装置及测试方法,特点是包括用于提供恒温恒湿环境的矩形外壳、用于夹持试样的水平夹持器、激光发射器和用于记录液滴运动轨迹的摄像机,水平夹持器固定在矩形外壳的内壁,激光发射器位于水平夹持器的上方且摄像机位于水平夹持器的下方,试样位于激光发射器和摄像机之间,激光发射器的线状激光垂直照射在试样表面,其测试过程中在试样表面激光照射线的起始位置滴一滴水滴,液滴在自身重力的作用下向下运动,通过摄像机记录液滴下落的轨迹,若液滴轨迹发生偏移,说明试样涂层厚度不均匀,若液滴轨迹与基准线重合,说明该测试区域试样涂层厚度均匀,优点是简单、高效、使用范围广。(The invention discloses a coating uniformity testing device and a testing method based on a liquid drop movement track, which are characterized by comprising a rectangular shell for providing a constant temperature and humidity environment, a horizontal clamp holder for clamping a sample, a laser emitter and a camera for recording the liquid drop movement track, wherein the horizontal clamp holder is fixed on the inner wall of the rectangular shell, the laser emitter is positioned above the horizontal clamp holder, the camera is positioned below the horizontal clamp holder, the sample is positioned between the laser emitter and the camera, linear laser of the laser emitter vertically irradiates the surface of the sample, a liquid drop drops at the initial position of laser irradiation rays on the surface of the sample in the testing process, the liquid drop moves downwards under the action of self gravity, the falling track of the liquid drop is recorded through the camera, if the track of the liquid drop deviates, the thickness of the coating of the sample is not uniform, if the track of the liquid, the thickness of the sample coating in the test area is uniform, and the advantages of simplicity, high efficiency and wide application range are achieved.)

1. A coating uniformity testing device based on a liquid drop movement track is characterized in that: including the rectangle shell that is used for providing constant temperature and humidity environment, the horizontal holder that is used for the centre gripping sample, laser emitter and the camera that is used for recording the liquid drop motion trail, horizontal holder be located the rectangle shell in and fix the inner wall of rectangle shell, laser emitter be located horizontal holder's top just the camera be located horizontal holder's below, the sample be located laser emitter with the camera between, laser emitter's linear laser vertical irradiation be in the sample surface.

2. A coating uniformity testing method based on a droplet movement track using the testing device of claim 1, characterized by comprising the steps of:

(1) clamping the upper end of the sample by using a horizontal clamp, and adjusting the position of the sample to ensure that the surface center line of the sample is completely vertical to the horizontal plane;

(2) emitting linear laser by a laser generator, vertically irradiating the linear laser on the surface of a sample, and taking the linear laser as a reference standard of a liquid drop moving track;

(3) dropping a water drop at the initial position of the laser irradiation ray on the surface of the sample, wherein the water drop moves downwards under the action of self gravity;

(4) recording the falling track of the liquid drop through a camera, if the falling track of the liquid drop deviates, the thickness of the sample coating is not uniform, and the thickness of the coating in the area where the liquid drop deviates is large, if the falling track of the liquid drop is superposed with linear laser emitted by a laser generator, the thickness of the sample coating in the test area is uniform, and then further carrying out uniformity test on other areas of the coating by horizontally moving the sample;

(5) rotating the sample by 90 degrees, clamping the upper end of the sample by using a horizontal clamp again, adjusting the position of the sample to ensure that the surface center line of the sample is completely vertical to the horizontal plane, and repeating the steps (2) to (4) to measure the uniformity of the surface coating of the sample in the other vertical direction;

(6) if the sample has multiple surfaces, repeating steps (1) - (5) to measure the coating uniformity of the rest of the sample, if the coating on each side of the sample has uniformity, the sample has a uniform coating on the whole, otherwise the sample has a non-uniform coating.

Technical Field

The invention relates to a coating uniformity testing device, in particular to a coating uniformity testing device and a coating uniformity testing method based on a liquid drop motion track.

Background

Objects exposed to the atmosphere are subject to attack by various corrosive elements, for example steel structures which are critical in engineering are susceptible to failure due to oxygen corrosion, and for this reason it is necessary to coat their outer surfaces with a protective coating. Still other structures require special properties such as fire protection, stealth, insulation, etc., which require the application of a special coating material to the surface. In addition, the coating also has a decorative effect, can fully change the appearance of the substrate, and endows the substrate with gorgeous colors, different gloss and rich texture. Although the coating has the characteristics of protection, insulation, decoration and the like, the coating is required to be uniformly coated on the surface of the substrate so as to fully play the role of the coating. However, due to the influence of factors such as coating mode, coating material property, substrate property and the like, the thickness of the coating layer is not uniform, thereby affecting the coating effect. Therefore, it is urgently needed to develop a coating uniformity testing device which can be simple, efficient and wide in application range.

Disclosure of Invention

The invention aims to provide a coating uniformity testing device and a coating uniformity testing method based on a liquid drop motion track, which are simple, efficient and wide in application range.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a coating uniformity testing arrangement based on liquid drop motion trail, is including the rectangle shell that is used for providing constant temperature and humidity environment, the horizontal holder that is used for the centre gripping sample, laser emitter and the camera that is used for recording the liquid drop motion trail, horizontal holder be located the rectangle shell in and fix the inner wall of rectangle shell, laser emitter be located the top of horizontal holder and the camera be located the below of horizontal holder, the sample be located laser emitter with the camera between, laser emitter's linear laser shine perpendicularly the sample surface.

A coating uniformity testing method based on a liquid drop motion track by using the testing device comprises the following steps:

(1) clamping the upper end of the sample by using a horizontal clamp, and adjusting the position of the sample to ensure that the surface center line of the sample is completely vertical to the horizontal plane;

(2) emitting linear laser by a laser generator, vertically irradiating the linear laser on the surface of a sample, and taking the linear laser as a reference standard of a liquid drop moving track;

(3) dropping a water drop at the initial position of the laser irradiation ray on the surface of the sample, wherein the water drop moves downwards under the action of self gravity; when the thickness of the coating on the surface of the sample is not uniform, the Young modulus of the coating is lower than that of the substrate, namely the coating is soft and the substrate is hard, the apparent contact angles of two sides of the liquid drop are different due to the thickness difference of the soft coating, the contact angle of the liquid drop is small in a thick coating area, namely the area is more hydrophilic, and the water drop can move to the thick coating area in the falling process;

(4) recording the falling track of the liquid drop through a camera, if the falling track of the liquid drop deviates, the thickness of the sample coating is not uniform, and the thickness of the coating in the area where the liquid drop deviates is large, if the falling track of the liquid drop is superposed with linear laser emitted by a laser generator, the thickness of the sample coating in the test area is uniform, and then further carrying out uniformity test on other areas of the coating by horizontally moving the sample;

(5) rotating the sample by 90 degrees, clamping the upper end of the sample by using a horizontal clamp again, adjusting the position of the sample to ensure that the surface center line of the sample is completely vertical to the horizontal plane, and repeating the steps (2) to (4) to measure the uniformity of the surface coating of the sample in the other vertical direction;

(6) if the sample has multiple surfaces, repeating steps (1) - (5) to measure the coating uniformity of the rest of the sample, if the coating on each side of the sample has uniformity, the sample has a uniform coating on the whole, otherwise the sample has a non-uniform coating.

Compared with the prior art, the invention has the advantages that

1. The invention mainly utilizes the gradient difference of the Young modulus of the substrate to influence the movement track of the liquid drop, and tests the uniformity of the coating by observing the change of the track of the liquid drop, so that the device has the characteristics of high efficiency, convenience and simple and convenient operation.

2. In the measuring process, the liquid drop moves by depending on the gravity of the liquid drop and without depending on equipment such as a circuit and the like, so the invention has the characteristics of safety, low price and firmness and durability.

3. The invention does not have a complex magnetic induction device of a common coating thickness gauge, but directly judges by the shooting result of a camera, thereby having the characteristics of convenient preparation and wide application range.

In conclusion, the device has the characteristics of high efficiency, convenience, safety, wide application range, low price, convenience in preparation and firmness and durability, is separated from the traditional coating uniformity measuring device in a certain sense, and has wider application space compared with the existing coating measuring devices with most designs.

Drawings

FIG. 1 is a schematic structural diagram of a coating uniformity testing device based on a droplet movement track according to the present invention;

fig. 2 is a schematic structural diagram of the testing apparatus after the sample in fig. 1 is rotated by 90 °, wherein the labels are as follows: 1-rectangular shell, 2-horizontal holder, 3-laser emitter, 4-sample, 5-camera;

fig. 3 is a schematic view of the droplet movement principle of the present invention.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.