Polymer paint crosslinking agent

Polymer paint crosslinking agent

The effect of glass temperature on emulsion performance. The high and low temperature of the glass is directly related to the flexibility of the polymer chain, the molecular chain is flexible and the glass temperature is low. The molecular chain is rigid, the glass temperature is high. By synthesizing the emulsion of different glass temperature, the corresponding elastic coating is made and the performance of elastic coating is tested. The elastic coating PVC = 30%, the crosslinked monomer is 2% of the total monomer.

The effect of emulsion glass temperature on elastic coating

With the decrease of the emulsion glass temperature, the temperature extension of the coating and the low temperature extension rate increase, and the tensile strength and the stain resistance gradually decrease. The effect of glass temperature on the mechanical properties of polymer is consistent.

When the emulsion of glass transition temperature drops below 35 ℃ to -, coating surface too soft, easily stick ash, the fouling resistance can not meet the requirements, and the tensile strength is not up to standard. And DangTu membrane glass transition temperature at 25 ℃ above, the coatings of low elongation decreased. Comprehensive the above test results, the emulsion of glass transition temperature in - 35 ~ 25 ℃, the coating has good comprehensive performance.

Emulsifiers on emulsion polymerization and greater influence on the performance, the structure of emulsifier, critical micelle concentration (CMC) or dosage on the emulsion particle size and its distribution, viscosity, film forming temperature, the polymerization stability and coating continuity integrity, has very important effects on the water resistance, adhesion, etc.

This experiment adopts the reactive emulsifier and the combination of anionic emulsifier compound emulsion system, since it has polymerization activity of reactive emulsifiers, its functional groups can participate in emulsion polymerization reaction, in addition to its effect in conventional emulsifier, can also by covalent bond to become a part of the polymer emulsion particle surface, avoid the emulsifier parsing or from the polymer particles in emulsion membrane migration, greatly reducing the latex film on the surface of the hydrophilic group, thus can improve the stability of the emulsion and improve the water resistance and mechanical properties of emulsion membrane.




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


Anionic emulsifier emulsion stability by electrostatic force, when the anionic emulsifier adsorption in the surface of the polymer particles and ionized form negatively charged surface layer, from the fixed layer to form a potential of system itself, the electrostatic repulsion to maintain the stability of the system [3]. Confirmed by the test of emulsifier content is 1.5% ~ 2.0% of monomer amount, and reactive emulsifier and anionic emulsifier according to 2:1, monomer emulsion effect is better, emulsion stability and other performance is better also.

The variety and dosage of initiator directly affect the product yield and quality, and affect the rate of polymerization, the monomer conversion, the latex particle size and viscosity of emulsion and film forming performance, etc. When the concentration of initiator increases, the conversion rate, viscosity and gel effect of the system increase.

On the other hand, the concentration of initiator increases, the production rate of free radicals is large and the chain termination rate is large, and the average molecular weight of the polymerization decreases. When the concentration of initiator is low, the polymerization rate is low, the system conversion rate is low, the reaction is not complete. In this test reaction, a sulfate initiator was used, causing the dose to be 0.5 ~ 1.0 percent.

In the synthesis of emulsion, the introduction of monomer DAAM - ADH self crosslinking system, through to the emulsion performance and elastic coating testing evaluation, analyses the crosslinking monomer content on the influence of acrylic acid emulsion, test showed that self-crosslinkable monomer content in emulsion is 1.5% ~ 1.5% of total amount of monomer, the corresponding elastic coating has good mechanical properties and resistance to contamination.

The high and low temperature of the emulsion is directly related to the flexibility of the polymer chain, and it also directly affects the mechanical properties and contamination of elastic coatings. Through the study, the emulsion glass transition temperature in - 35 ~ 25 ℃, the corresponding elastic coating has good comprehensive performance.

Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd 

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