Autoatic Scratch Tester QHZ

Autoatic Scratch Tester

Purpose：

The strength, hardness and adhesion of the coating film are important physical properties of the coating film, which directly affect the important performance of the coating film, such as: abrasion resistance; Abrasion resistance; Scratch resistance; The impact resistance, the retention effect of the coating film and the difficulty of cleaning, etc. Therefore, the strength and hardness of the coating film are necessary indicators for evaluating the performance of the coating. This instrument can conveniently and comprehensively evaluate the physical characteristics such as film strength, hardness and adhesion. Therefore, the purpose of this instrument is to characterize the strength, hardness and adhesion of the coating through the penetration resistance of the coating of the paint film template when it is scored by the scoring needle.

This instrument is a special equipment developed for the implementation of gb9279-88, which is the condition for the implementation of this national standard.

Working principle of the instrument：

This instrument is mainly composed of a stylus rack and a workbench. The stylus on the stylus rack ensures that it acts vertically on the film template (the template is fixed on the experimental platform on the workbench and can move horizontally or longitudinally; the horizontal movement can be mobile or manual after the power is turned off, and the vertical movement is manual).

After the power is turned on, the red indicator of the power switch lights up to indicate that the instrument is powered on. At this time, if the return switch is in the experimental state, the workbench moves from right to left, and the scriber contacts the sample plate in the "experimental" stroke; In the return stroke (the return switch is turned back to the "return" state), the workbench moves from left to right, and the stylus is lifted without touching the template. By changing the weights added on the stylus holder, it can be measured whether the paint film can be broken under different weights. The minimum weight required to break the paint film is used to judge the value of the scratch resistance of the coating film.

Use requirements：

1. Coating film template: prepared according to gb9271-88, specification: 120 * 50mm

2. Experimental environment: temperature 23 ± 2 ° C, relative humidity 50 ± 5% (refer to gb9278-88)

Parameters:

Model: qhz

Stroke needle length ≥ 60mm

Stroke needle moving speed: 20 ~ 40mm / S

Diameter of steel ball of scriber: 1mm

Load (loading) range 0 ~ 2000g

The angle between the scriber and the test sample plate is 10 ~ 15 °

Minimum increment: 50g

Motor power: 15W

Conform to standards GB / t9279-88 and iso1518-73

Power supply voltage: 220V 50Hz

Overall dimension: 180 * 230 * 280mm

Instrument weight: 10kg

Speed regulation: constant speed, no speed regulation