Characteristics of dispersing additive for aqueous coatings

2021-09-30   Pageview:119

Particularly suitable for pigment concentrates, for transparent iron oxide and transparent titanium dioxide pigments, for transparent effects, low foaming and solvent free.

Typical application
– Pigment concentrates
– Automotive paints
– Wood paints, varnishes and stains
– Wood stains
– Leather coatings
– Industrial coatings

 

 

 

 

 

 

 

 

 

 

 

 

 

The solubility of azo compounds in solvents is also very important. Common azo compounds are hardly soluble in water but easily soluble in organic solvents. By introducing hydrophilic groups in oil-soluble azo compounds, water-soluble azo initiators have been developed. This water-soluble initiator is generally suitable for aqueous polymerization and emulsion polymerization of polymer synthesis. Compared with oil-soluble azo initiators, water-soluble azo initiators have higher initiation efficiency, higher relative molecular weight, good water solubility and less residue. The structure of common water-soluble azo initiators is shown below.

HNCH, CH, NH-C-N-N-C
2HCNHCH, CH, NH
(4-24)
R
CH, CH
B-C-N–N-A(4-25)CNeN
R can be H-, -CH,, CHCH zN He, -CH, CH, OH, CH: etc., A and B are active end groups (one OH or -COOH, etc.). Water-soluble initiator with active end groups Agents can be used to prepare telechelic polymers.

The polymerization temperature of the water-soluble coupling initiator at 4/2=10h is 56℃. The water-soluble azo initiator is used to initiate the polymerization of acrylamide, and the relative molecular weight of the obtained polylactam is about 14 million to 18 million. The product has good solubility. When R is a polyethylene oxidized wax cyclic amidine group [, the water-soluble couple The decomposition rate of the nitrogen initiator is increased by 10 times, and it can be used for the polymerization of acrylamide in water at 50°C or the polymerization of vinyl acetate (VAc) in methanol at 50°C. The reaction is 3h, and the conversion rate is ≥90%.

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