Synthesis and Application of Paint Printing Thickener

Inverse emulsion polymerization uses an emulsifier and a stirring action to disperse the water-soluble monomer in a non-polar organic liquid to form a water-in-oil (W/O type) emulsion, which is then subjected to a polymerization reaction. During the polymerization, since the aqueous monomer solution is dispersed in the oil in micron-sized particles, the polymerization product formed after the polymerization remains at the micron level. Therefore, the invert emulsion can maintain a low viscosity during the polymerization process, and is easy to stir and dissipate heat. The final product thickener is a liquid formulation 12i, which is easy to use.

Paint printing paste is composed of paint, adhesive, thickener and a small amount of auxiliary materials. The performance of thickener plays an important role in printing. Synthetic thickeners have the following advantages: (1) long storage time, need to add preservatives; (2) easy to use, its viscous body can be used after stirring with water for 10 min; (3) cheap; (4) water absorption Large, thickening effect is good, color paste stability, no delamination, no skinning, printing can reduce the drag knife, blocking mesh, improve color fastness; (5) high temperature fixation, will not harden and discoloration.

1 Test

1.1 Chemicals

Acrylic acid (AA), acrylamide (AM), paint green PB, urea, coating binder (all of above products are industrial grade), N, N · methylenebisacrylamide (BMAA), ammonium persulfate, ammonia water ( 25% -28%), Span~0, Span-80, 200# solvent oil, Tween 80, TX-10 (all of which are commercially available as analytical grade or chemical grade).

1.2 Equipment

Four-necked flask, dropping funnel, force-stirred stirrer (JJ-1), NDJ-79 rotary viscometer, oven (101-2A type), and rubbing fastness tester (Model 571).

1.3 Polymerization method

Acrylic acid and acrylamide were mixed, distilled water, initiator and cross-linking agent were added, and the mixture was cooled to room temperature with stirring, referred to as solution A. In a 500-ml four-necked flask equipped with a stirrer, a thermometer, a dropping funnel, and a nitrogen gas pipe, the amount was lost. The solvent oil and emulsifier are well mixed, and the water bath is heated to a certain temperature so that the emulsifier is completely dissolved in the solvent oil. After nitrogen is exhausted for 20-25 minutes, the solution A is slowly added under high-speed stirring, and the high speed is added. Stir for 10 min, then gradually increase the temperature to 60 °C for 2 h and then heat up to 70 °C for 1 h. Adjust the pH to 7 with aqueous ammonia, and mix thoroughly until even yellowing to obtain a light yellow viscous polymer.

Source: China Washing & Dyeing Industry Information Center