Agen leveling adalah sejenis aditif pelapis, yang dapat membuat permukaan lapisan menjadi halus setelah konstruksi, dan mengurangi cacat seperti gelombang dan gelembung pada permukaan lapisan. Agen perata umumnya merupakan senyawa organik polimer, perannya adalah untuk mengurangi tegangan permukaan lapisan, sehingga mengurangi akumulasi pembentukan cairan dan gelembung pada permukaan lapisan, agar permukaan lapisannya lebih halus. The amount of leveling agent in the paint is small, usually only need to add 0.1% ke 1% of the proportion, but for some high-demand coating products, the choice of leveling agent and the amount of addition is very important.

Test performance and standard
The following is the performance of the leveling agent to be tested and the corresponding testing method, as well as the possible testing standards:

Uji kinerja, metode pengujian dan standar pengujian agen leveling

Uji kinerja, metode pengujian dan standar pengujian agen leveling

It is necessary to select appropriate detection methods and standards according to different types of leveling agents and application scenarios, and pay attention to the accuracy and repeatability of detection.

Metode deteksi
The following is the performance of the leveling agent to be tested and the corresponding testing method:

Appearance: Observe the appearance of the sample and check whether there are bad phenomena such as color difference, suspended matter and precipitation.

Viskositas: It can be measured by rotating viscometer, drip method, direct drawing method and other methods. The rotary viscometer can measure the viscosity, fluidity and other properties of leveling agent. Drip method can be used to test the flow performance of paint, usually using centrifugal drip meter or tube drip meter; The direct stretching method is suitable for the measurement of high viscosity coatings.

Kepadatan: The density of the leveling agent is measured using a densitometer, usually a tube densitometer or an electronic densitometer.

Solubility: Solubility test can be carried out, the leveling agent is mixed with the solvent and observed and judged, and it can also be analyzed by instruments such as GC-MS.

Volatility: can use oven method to determine the volatility of the paint, according to a certain temperature and time conditions, measure the quality of the paint change, calculate the volatile content. Testing standards include ISO 3251, ASTM D2369, GB/T 1728, dll..

Uji kinerja, metode pengujian dan standar pengujian agen leveling

Drying time: can be measured by oven method, touch drying method and other methods, according to the degree of coating drying to evaluate the length of drying time. Testing standards include ASTM D1640, ASTM D869, ISO 9117, dll..

Flatness: It can be measured by color difference meter, observation method, patch method and other methods to evaluate the flatness and gloss of the coating surface. Testing standards include ISO 2813, ASTM D523, JIS K 7105, GB/T 9754, dll..

Adhesi: The bonding strength between the coating and the substrate can be measured by means of grid method and peel test. Test standards include ASTM D3359, ASTM D6677, GB/T 9286, dll..

Ketahanan aus: Wear testing machine can be used to measure the wear resistance of the coating. Testing standards include ISO 7784, ASTM D4060, JIS K 7204, GB/T 1768, dll..

Ketahanan terhadap bahan kimia: Chemical resistance test can be used to soak in chemical reagents to test the resistance of the coating to chemical reagents.

Tahan air: soaking test, spray test and other methods can be used to measure the coating’s resistance to water. Testing standards include ISO 2812-2, ASTM D2247, JIS K 5600-7-1, GB/T 1733, dll..

Tahan terhadap cuaca: artificial climate aging test, natural climate aging test and other methods can be used to measure the durability of the coating under different climatic conditions. Testing standards include ASTM D4587, ISO 11507, JIS K 5600-5-7, GB/T 1865, dll..

Tahan api: flammability test, combustion test and other methods can be used to measure and evaluate the fire resistance of the coating. Testing standards include ASTM E84, GB/T 8626, dll..

VOC content: It can be measured by gas chromatography to evaluate the content of volatile organic compounds in coatings. Testing standards include ASTM D6886, JIS K 0561, GB/T 23985 and so on.