Definition
Putty polishing tester is a special experimental equipment used to evaluate the anti-wear performance and construction convenience of the surface treatment layer of building decoration materials after curing under mechanical grinding operation. The instrument quantifies and measures the grinding efficiency, surface uniformity and dust generation of materials by simulating the grinding process in actual construction, and provides data support for product quality control and process optimization.
Principle
The instrument is designed based on the principle of friction and wear, usually using a rotating or reciprocating grinding head to periodically polish the surface of the specimen under the specified load, speed and stroke. The polishability of a material is characterized by measuring the amount of material removed after a specified number of grinds, changes in surface gloss, or the time it takes to polish to a specific state. The core relationship can be expressed as follows: the grinding performance is related to the hardness, bond strength and particle fineness of the material, which can be described by the following simplified model:
G = k · (F · N) / (H · t)
G represents the grinding efficiency index, k is the instrument constant, F is the applied load, N is the number of polishing, H is the material hardness-related parameters, and t is the grinding time. The model reflects the correlation between the material removal rate and the mechanical parameters and the properties of the material itself under controlled conditions.
Measurement method
The measurement process is carried out in accordance with relevant industry standards such as the Architectural Coatings and Putty Product Testing Specifications. First, the prepared specimen is fixed on the instrument platform, and the specified type of sanding sandpaper or sanding head is installed. Set instrument parameters, including load force, grinding speed, reciprocating or rotational stroke, and total sanding cycles. After starting the instrument, the sanding head moves uniformly across the specimen surface. After completion, the specimen is removed, the surface dust is removed, and the material loss mass is measured by the weighing method, or the surface roughness meter and gloss meter are used to evaluate the surface state change. Some methods also collect dust from sanding and weigh it to assess job cleanliness.
Influencing factors
The results are influenced by multiple factors. In terms of materials, the bonding strength of the base material, the type and particle size distribution of the filler, the degree of curing and the moisture content will all change its grinding resistance. In the instrument parameters, the load size, the movement speed of the grinding head, the number of sandpaper mesh and the grinding trajectory mode directly affect the wear rate and surface effect. Environmental conditions such as temperature and relative humidity may affect the physical state of the material and the wear of the sandpaper. In addition, the uniformity and flatness of sample preparation are also the prerequisites for ensuring data reliability.
Application:
This instrument is mainly used in building material manufacturers, quality inspection institutions and R&D units. In the development stage of putty, coating base, decorative mortar and other products, it is used to screen formulations and optimize process parameters. In production quality control, it is used for consistency inspection of batch product performance. In terms of construction guidance, help determine the best sanding time and tool selection. In addition, its test data can provide a technical basis for the formulation and revision of relevant industry standards.
Selection
When selecting an instrument, consider that the measurement range should cover the expected range of hardness and polishing of the material to be tested. The instrument should have parameter adjustable functions, such as load, speed, and stroke can be accurately controlled to adapt to different standard methods. Stability and repeatability are the key indicators, and it is recommended to pay attention to the stability of the transmission system and the reliability of the clamping mechanism. The data collection method should choose a model that directly measures and records parameters such as the number of polishing, time and mass loss to improve efficiency. In addition, the instrument design should facilitate sandpaper replacement and dust cleaning, and meet laboratory safety and environmental protection requirements.