News Details
Emulsion coating crosslinking agent
2017-8-25 17:20:46
Emulsion coating crosslinking agent
The emulsion coating crosslinking agent has made great progress, and several crosslinking agents can be used for room temperature crosslinking.
The most valuable emulsion used in the cross-linking agent is the resin emulsion containing the carboxyl group.
The most promising method for the study of the cross-linking agent in emulsion is to introduce an unsaturated group in the polymer, which can automatically oxidize the crosslinking.It is possible to introduce double bonds with allyl monomers or polymer synthesis, which is called postfunctionalization.
An allyl group is the one that is left after a hydrogen atom is removed from the methyl (CH3 -) carbon atom in the molecule of propylene.CH = ch-ch3 is called n-propyl (system named 1-propylene) - CH2 - CH = CH2 - CH2 - diallyl (system called 2-propylene).
The above n-propylene and normal propylene are both common nomenclature.If you remove a hydrogen from the intermediate carbon atom in the propylene molecule, the common name method is hetero-1 propylenyl;If you use a methyl group instead of a isobutylene or 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.
The allyl group is the electron group, and the propylene group is the electron group.Because the allyl group is the electron group, the activity is higher, the reagent activity of allyl 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.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Uses:
The emulsion coating crosslinking agent has made great progress, and several crosslinking agents can be used for room temperature crosslinking.
The most valuable emulsion used in the cross-linking agent is the resin emulsion containing the carboxyl group.
The most promising method for the study of the cross-linking agent in emulsion is to introduce an unsaturated group in the polymer, which can automatically oxidize the crosslinking.It is possible to introduce double bonds with allyl monomers or polymer synthesis, which is called postfunctionalization.
An allyl group is the one that is left after a hydrogen atom is removed from the methyl (CH3 -) carbon atom in the molecule of propylene.CH = ch-ch3 is called n-propyl (system named 1-propylene) - CH2 - CH = CH2 - CH2 - diallyl (system called 2-propylene).
The above n-propylene and normal propylene are both common nomenclature.If you remove a hydrogen from the intermediate carbon atom in the propylene molecule, the common name method is hetero-1 propylenyl;If you use a methyl group instead of a isobutylene or 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.
The allyl group is the electron group, and the propylene group is the electron group.Because the allyl group is the electron group, the activity is higher, the reagent activity of allyl 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.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Uses:
The product is identical to Ethancure 100 and Lonza DETDA 80, DETDA is very effective polyurethane elastomer chain extender; also be used as polyurethane and epoxy resin curing agent, epoxy resin of an antioxidant, industrial oils and lubricants . In addition, also as intermediates in organic synthesis.Especially for the RIM (reaction injection molding), is important in the field of spray polyurea chain extender species. Also can be used for casting polyurethane elastomer (CPU) and a curing agent, epoxy curing agent, epoxy resin of antioxidants, lubricants and industrial oils other antioxidants.
Color matching is a more complicated and detailed work, because there are so many kinds of colors, you need to know the performance of various pigments, and you also need to judge the color difference accurately.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.
The wet film is spread and flatten out from coating to loss of effective fluidity (including the flow patterns that have been reacquired by the increase of temperature during baking).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.
The defects of paint film caused by surface tension include shrinkage cavity, orange peel, float color and thick edge, etc. This paper introduces the shrinkage cavity and orange peel.
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.At the same time, the solvent is volatilizing, the viscosity of the system is increasing, so the viscosity has increased enough to make the flow basically stop before forming spherical particles.This results in an uneven layer of membranes, some of which are only a little thick (if there is a membrane), and the adjacent areas are unusually thick, which is often referred to as "retraction".
"Shrinkage" means the defect of a small and round surface on the surface of the paint, which looks like a crater.The shrinkage cavity is caused by the coating internal or the wet surface adhesion of the wet surface adhesion to the low surface tension.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 occurs, the solvent evaporates and the surface tension increases, so the flow continues.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Color matching is a more complicated and detailed work, because there are so many kinds of colors, you need to know the performance of various pigments, and you also need to judge the color difference accurately.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.
The wet film is spread and flatten out from coating to loss of effective fluidity (including the flow patterns that have been reacquired by the increase of temperature during baking).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.
The defects of paint film caused by surface tension include shrinkage cavity, orange peel, float color and thick edge, etc. This paper introduces the shrinkage cavity and orange peel.
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.At the same time, the solvent is volatilizing, the viscosity of the system is increasing, so the viscosity has increased enough to make the flow basically stop before forming spherical particles.This results in an uneven layer of membranes, some of which are only a little thick (if there is a membrane), and the adjacent areas are unusually thick, which is often referred to as "retraction".
"Shrinkage" means the defect of a small and round surface on the surface of the paint, which looks like a crater.The shrinkage cavity is caused by the coating internal or the wet surface adhesion of the wet surface adhesion to the low surface tension.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 occurs, the solvent evaporates and the surface tension increases, so the flow continues.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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