Coating metal ion crosslinking agent

Coating metal ion crosslinking agent

Metal ion crosslinking mechanism. Metal ion crosslinking polymer (also called from dimer) usually refers to the macromolecular chain containing a small amount of less than 10% (mole fraction) suspension acid radical, and the acid group and part or all of the suspension and the category of polymer into salt. The concept was first proposed by Rees and others in the 1960s, the same year that the ethylene/methacrylate ion interlinked polymers were introduced.

Ionic groups and ion of the electrostatic attraction and repulsion between and complexing action made from polymers has a unique state of aggregation structure, the structure determines its is different from the nature of the substrate.

There are ion clusters or more heavy ion to play the role of a junction, made from dimer dynamic mechanical properties compared with common polymer with high initial modulus, high elongation at break, low permanent deformation of the special mechanical properties.

The group can be divided into two groups: carboxylic acid, sulfonate, mercap-type, and phosphite. The study of carboxylic acid is the most studied, since carboxylic acid is easier to introduce in the emulsion system, and the performance is better, so there are almost 90 percent of the carboxylic acid in the polymer.

Carboxylic acid type transition metal ions in ionic crosslinking emulsion tend to form ammonia complexing ions, in the process of emulsion film, as the ammonia volatilization, metal ions, gradually free from complexes, emulsion also gradually changed from weak alkaline to weak acid. Then the non-soluble salt or compound can be formed by the carboxylic acid ions suspended from the metal ions and emulsion polymer chains, thus the crosslinking of the adhesive film is achieved.

Adhesion determination: according to GB/T 9286-1998, the spacing is 2 mm.

Dry time measurement: the dry and solid work of the table in GB/T 1728-1979 (1989), and the method of dry and dry.

The appearance of lotion: placed under natural light.

Emulsion viscosity determination: emulsion under the condition of (23 + 2) ℃ tu - 4 cup is used to test, in seconds (s) records.




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


The storage stability of emulsion and the grinding and adhesion of the coating: according to the regulation of HG/T 3828-2006.

Determination of resistance to water: use specifications for 100 microns of wet film coating latex evenly coated in 10 cm x 15 cm of the glass, placed in 7 days with paraffin wax sealing side and the water, to can't clearly see through glass under 5 black words on white paper records the time (h). Determine its water resistance by the amount of time it appears.

The determination of the minimum film-forming temperature: according to GB/T 9267-1988, with tianjin's day of test equipment co., LTD., manufacture QMB tester to determine the minimum film-forming temperature of the minimum film-forming temperature of latex.

Infrared spectrum analysis: the PE - M1730 Fourier transform infrared spectrometer (Perkin Elmer - companies in the United States) under constant temperature and humidity, an analysis of the infrared/biphenyl acrylic emulsion.

Infrared spectroscopy analysis. In 1 731 cm - 1 C = O stretching vibration peak, carboxyl in the form of a single, C = O absorption peak of wave number is about 745 cm - 1, and in the form of dimers, absorbing wave number between 1 710 ~ 1 735 cm - 1. After crosslinking polymer, 1 731 cm - 1 the dimerization of C = O absorption peaks of the carboxyl still exists, and the new appeared 1 and 1 599 cm - 515 cm - 1 1 absorption peak, its for C = O carboxylate asymmetric peak, indicating that some of carboxyl and metal ion complexing crosslinking reaction happened.

The effect of the added amount of acrylic function unit. During polymerization in functional acrylic monomers make latex particle surface distribution have COO - functional groups, not only can be used as a junction with zinc ions, but also have great help to the stability of the emulsion.

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