4 results about "Sodium polycarboxylate" patented technology

This invention relates to the field of rubber processing aids, and more particularly to a sodium polycarboxylate stripping dispersant for rubber, its preparation method, and its application. This invention uses a ternary copolymer system composed of acrylic acid, maleic anhydride, and acrylamide in a reasonable ratio. The prepared sodium polycarboxylate can withstand harsh stripping conditions (high temperature and high shear) and has highly efficient anti-caking properties. The sodium polycarboxylate prepared by this invention forms a stable protective layer on the surface of rubber particles through a triple mechanism of electrostatic repulsion, steric hindrance, and hydrogen bonding adsorption, effectively preventing the rubber from sticking and agglomerating at high temperatures.

This invention discloses a low-temperature rapid-fired high-density building ceramic brick and its preparation method, belonging to the technical field of building ceramic materials. The ceramic brick uses potassium-sodium feldspar, kaolin, clay, quartz sand, calcined talc, wollastonite, waste ceramic powder, a low-temperature eutectic densifying component, sodium carboxymethyl cellulose, sodium polycarboxylate dispersant, and water as raw materials. The low-temperature eutectic densifying component has a borosilicate glassy phase coating layer, lithium aluminum silicon crystal nuclei, and a calcium-magnesium flux phase. The brick is prepared by ball milling, spray granulation, aging, pressing, drying, and rapid firing. This invention can promote liquid phase wetting, interstitial filling, and glassy phase bridging under low-temperature rapid firing, improving density, mechanical properties, and the utilization rate of waste ceramic powder.

This invention discloses a refractory and anti-oxidation coating for carbon electrodes and its preparation and application methods. The coating is a homogeneous and stable aqueous suspension, comprising, by weight: 28-35 parts potassium silicate, 12-18 parts sodium silicate, 18-25 parts α-alumina micro powder, 10-15 parts boron carbide micro powder, 6-10 parts nano-silicon powder, 4-7 parts cryolite micro powder, 1-3 parts magnesium fluoride micro powder, 3-5 parts mullite whiskers, 1.5-3 parts rare earth composite oxide, and silane coupling agent KH560. 0.3~0.8 parts, sodium polycarboxylate dispersant 0.6~1.2 parts, deionized water 8~15 parts; rare earth composite oxide is composed of La2O3 and CeO2 in a mass ratio of 1:1. The coating has a solid content of 68~75%, pH value of 8.8~9.5, viscosity of 35~50s, particle size D90≤4.5μm, porosity≤8%, and storage stability≥90d. Through the synergistic effect of rare earth-silane dual modification, mullite whisker reinforcement and low-temperature activation of nano-silicon powder, the coating achieves a high-temperature adhesion strength ≥2.2MPa, thermal shock resistance ≥25 cycles, and can be sintered at low temperature with excellent construction performance. It is suitable for various high-temperature working conditions such as electrolytic aluminum and ferroalloy smelting.