HK-XR-14The high-speed mechanical stability tester for latex meets the requirements of GBT 8301-2008 Determination of Mechanical Stability of Concentrated Natural Latex and SHT 1151-1998 Determination of High speed Mechanical Stability of Synthetic Latex. This instrument is mainly suitable for latex production units and research institutes to conduct mechanical stability tests on natural latex and synthetic latex, and is an essential instrument for improving latex quality.

Testing method:

Firstly, dilute 100g of the sample with ammonia solution to achieve a solid content of 55% of the total mass fraction. Then, immediately heat the sample to 36-37 ℃ using a heating device while gently stirring. Then immediately filter the heated latex with a stainless steel wire mesh, weigh 80g of latex and place it in a container. Verify that the temperature of the latex should be at 35 ℃± 1 ℃. Place the latex in the designated position of the instrument for high-speed stirring and start timing until the endpoint is reached. The agitator speed should be 14000r/min ± 200r/min throughout the entire process.

Judgment of the endpoint: Before reaching the endpoint, the vortex around the stirring rod becomes noticeably shallower, and the sound of the stirring device also changes. There are two methods to determine the endpoint:

1Palm method: The judgment method is to take a drop of latex sample with a clean glass rod every 15 seconds, and gently place the sample on the palm of the hand. The endpoint is when * coagulation particles appear. To confirm that the endpoint has been reached, the stirring device can be stirred for another 15 seconds before sampling. If there is an increase in coagulation particles in the sample, it indicates that the judgment of the endpoint is correct.

2Water dispersion method: Take a flat bottomed dish containing 100-150mL of water, place it on a black surface, use a sharp glass rod to take a small droplet of the sample and immediately place it on the water surface of the flat bottomed dish. If the latex does not coagulate, it will disperse into the water in a few seconds and appear as a milky white cloud. If the latex coagulates, it is easy to see the coagulated particles after the sample is dispersed into the water.