Emulsion coating with crosslinking agent

Emulsion coating with crosslinking agent,Research has made great progress, there have been several crosslinking agent can be used for room temperature crosslinking. The more valuable is resin emulsion containing carboxyl.

Emulsion coatings by crosslinking agent at room temperature crosslinking of study on the most promising approach is the introduction of unsaturated group in the polymer, can make its oxidative cross-linking automatically. Can be used with allyl monomer, or polymer synthesis again after the introduction of double bond, called the faculties reaction (postfunctionalization).

Allyl refers to propylene molecules of methyl (CH3) after removing carbon atoms in a hydrogen atom, one price for the rest of the group, structured as follows: H2C = CH - CH2 -. - CH = CH - CH3 is called allyl (system named 1 - allyl) - CH2 - CH = CH2 is called allyl base name (system 2 - allyl)

The above is propylene and are allyl based are common nomenclature. If in the middle of the propylene molecules get rid of a hydrogen carbon atoms, common nomenclature is called "vision" is different - 1 propenyl; If replacing called isobutylene or with a methyl 2 - methyl - 1 - propylene. Regardless of the name must contain a double bond selected the longest carbon chain as the main chain, when number must begin from carbon atoms with free price, so can't call < 2 - allyl >, double bond position is still in the no. 1, instead of no. 2, is only the position of the substituents in no. 2.

Allyl is for electronic group, and allyl is electron-withdrawing groups. Allyl is for electronic group, so the activity is higher, allyl grignard reagent activity is higher.

All kinds of monochrome coatings (paint) is also called the primary varieties, although quite a lot, but also far can't satisfy people's needs, which requires the painter in the practical work, using the existing primary colors mix out more colorful paint color.

Color matching is a complex and meticulous work, because the sort of color very much, need to understand the performance of various pigments, also need accurate judgment of color difference. Used after paint, mainly by practical experience, according to the need to paint model to identify the existence of several kinds of monochrome, roughly how much is the proportion of each monochrome small kind mixing experiment, and then to carry on the preparation, but also should be carried out according to the basic principle of color science.




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


Wet film coating to lose effective liquidity (including baking to regain flow due to the raise of temperature in graphics), the distribution and flow. The distribution and flow flat, such as the former has described is driven by surface tension, including the surface of the surface tension of the interval difference caused by the surface flow, the surface flow, in some cases, is not conducive to the full flow flat and formed the paint film.

This malady caused by surface tension of the film including shrinkage cavity, orange peel, color, webbing, etc., in this paper, the shrinkage cavity and orange peel were briefly introduced.

If we put the surface tension of the larger paint coating to a substrate surface tension is relatively small, then paint not wetting substrate, the coating in the mechanical strength of the coating can be coated material on the surface, but not because the surface wettability and surface tension have a tendency to liquid coating back into spherical particles. In volatile solvent at the same time, the system viscosity increases, so the coating before into a spherical particles, viscosity has been increased flow enough to make the ground to a halt. This creates a layer of non-uniform membrane, some area just a little bit thick membrane (if any), and adjacent place unusually thick, this kind of behavior is often referred to as the "bounce back".

"Shrinkage" refers to the coating surface defect small, round, looks like a crater. Porosity is due to internal coating or coating on the wet surface after the construction of low surface tension caused by the pollution particles.

Some small surface tension of the substances dissolved in the near surface of the coating caused by local surface tension difference, because "Ma Lange, surface flow effect", the film part of the surface tension of small displacement particles around trying to cover large surface tension coating. When the flow, solvent evaporation, surface tension difference increase, so the flow to continue.

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