The coating is used in the constant temperature crosslinking system

The coating is used in the constant temperature crosslinking system. With water as a dispersing medium, the polymer emulsion is the development direction of environment-friendly polymer materials.

But dry polymer emulsion obtained compared with solvent base polymer materials, polymer materials, we still have some gap in mechanical properties, especially the water resistant performance, one of the most effective way to improve the performance of polymer emulsion was to make the macromolecular crosslinking.

Room temperature crosslinking system normally only for two-component system (2 k), two-component system using extremely inconvenient, crosslinking agent must join in construction, operation difficulty is big, the quality is difficult to agree between batches, but also very short lifespan.

High temperature crosslinking system can obtain one component packaging (1 k), using high temperature/cib make its application field is very limited, even can be used in a high temperature crosslinking field of application of high energy consumption is also an economic factors must be considered.

The development of low temperature or normal temperature 1K system is the development direction of high polymer emulsion, and the carbonyl hydrazine crosslinking system is one of the most promising one of the current temperature 1K systems. Using DAAM (diacetone acrylamide) as functional monomer in acrylic emulsion is introduced as a molecular carbonyl, carbonyl can and hydrazide under normal temperature acid catalytic dehydration condensation.

The development of DAAM. Experimental raw materials: acetone, analytical; Concentrated sulphuric acid, industrial grade; Acrylonitrile, analytical pure; Sodium chloride, chemical purity; Ammonia, industrial grade; Sodium hydroxide, chemical purity; Acrylate (BA), analytical pure; Acrylic (AA), chemically pure; Styrene (St), industrial aggregation; An emulsifier OP -10, an industrial grade; Sodium lauryl sulfate, chemical purity; Potassium sulfate, chemical purity; Sodium bicarbonate, analysis pure; Distilled water, self-control; Adipic hydrazine.

Steps: in three bottles of 500 mL, add 91 mL of acetone, 37 mL propylene cyanide, stir and add 65 mL of concentrated sulfuric acid, control temperature below 40 ℃. After add 65 mL of concentrated sulfuric acid, add in 40 ~ 50 ℃ water bath after 3 h of reaction temperature below 20 ℃.

Add the reaction mixture slowly to a certain amount of concentrated ammonia water, adjust the pH to 7 ~ 8, and filter. Apply adequate amount to the coarse vacuum distillation after adding distilled water extraction, organic layer products collect temperature 122 ~ 130 ℃, pressure is 660 Pa distillate, porphyrization after cooling, white crystal products, production rate of 45.4%.




Chinese name: Diethyl toluene diamine(DETDA)

Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.

Density 1.022

Viscosity (20 ℃) ??mPa·ss290±10

Pour Point ℃-9

Boiling point of310°C

Flash Point°C161.1°C


First of all, according to the formula ratio will partially monomer (DAAM, BA, St, AA), initiator, water (dispersion medium), emulsifier, etc to join four flask, remove the residual monomer and initiator to the separatory funnel. Install the condenser, mixer and thermometer. Through to condensate, start the agitator, with water bath heating temperature to 76 ℃, insulation to the liquid in blue, stirring up to 86 ℃, slowly add the remaining monomer and part of the initiator solution, 2 ~ 3 h drip off.

Finally, adding the rest of the initiator solution after add up to 90 ℃, the curing of 1 h. And then cooled to 30 ~ 40 ℃, add ammonia adjust pH = 8, discharging emulsion, reaction after adding adipic hydrazine corresponding quantity.

Test the main performance of the synthesized emulsion.

DAAM DSC analysis: PerkinElmer thermal analyzer, film weight 5 ~ 7 mg, temperature 10 ℃ / min.

The determination of crosslinking reaction (TEM photo) will be 1 ~ 2 drops of adipic hydrazine corresponding quantity in emulsion add 10 mL of distilled water, by phosphotungstic acid dyeing apply online, at room temperature after drying with TEM observation and photography.

The arrangement of the wall paint: the wall lacquer is ground in the high speed dispersive device according to the general regulation system.

The images from the electro mirror are visible in the presence of granule material, which is connected to each other. It is confirmed that the crosslinking reaction at room temperature has occurred.

Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd 

Diethyl toluene diamine(DETDA)  http://www.yaruichem.com