Antioxidant 1010 is a macromolecular multifunctional hindered phenolic antioxidant, soluble in benzene, acetone, chloroform, insoluble in water. No pollution, no coloring, small volatility, good extraction resistance. It is widely used in polyethylene, polypropylene, paraformaldehyde, ABS resin, PS resin, PVC, engineering plastics, rubber and petroleum products, and has excellent antioxidant properties for polypropylene and polyethylene. It can effectively extend the service life of products.
Its thickening mechanism is the work of existing hydrogen bonds. There are also end-group associations. Compared with general increasing R-NN-R-NN-R thickener, its anti-settling and anti-sagging properties HA should be better. According to the different polarity of the end groups, modified polyurea
Thickeners can be divided into three types: low-polarity polyurea thickening R represents low, medium, and high-polarity end groups; Diamine skeleton)
Thickener. The first two are used to thicken solvent-based coatings. Figure 19-7 is modified to modify polyurea to thicken. The high-polarity polyurea thickener can be used in both polar solvent-based coatings and water-based coatings. Thicken. Products of low-polarity, medium-polarity and high-polarity polyurea thickeners are BY K-411, BY K-410 and BYK-991, respectively.
At present, there are mainly three types of inorganic thickeners used in latex paint:
The first type is bentonite. Sodium-based bentonite is used more frequently. It has a flaky structure and increases water absorption volume to form a thixotropic three-dimensional network structure to thicken the system.
The second type is attapulgite, which is needle-shaped. After being dispersed in water, the particles form a network, which envelops the water to increase the thickness. Its thickening efficiency is higher than that of bentonite, and it has good thixotropic properties to prevent pigments and fillers from sinking.
The third type is fumed silica (white carbon black). In the production of coatings, the viscosity of the system can be controlled by adding appropriate white carbon black. When the system contains alcohol, the thickening effect is better, and it has a good Thixotropic performance, good anti-settling effect.
The common characteristics of these three inorganic thickeners are good biodegradability and low-shear thickening effect, but the roll coating has poor splash resistance.
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