Cathodic electrophoretic coating capable of improving yellowing of automobile sealant, and preparation method and application thereof
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A technology of cathodic electrophoretic paint and glue yellow, applied in electrophoretic paint, epoxy resin paint, coating and other directions, can solve problems such as yellowing of sealant
Active Publication Date: 2018-06-01
美高微球(南通)科技有限公司
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[0006] The object of the present invention is to provide a kind of cathodic electrophoretic paint and its preparation method for improving the yellowing of automobile sealant in order to overcome the defect in the technical existence of sealant yellowing phenomenon on the above-mentioned existing automobile cathode electrophoretic coating line
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Embodiment 1
[0127] In order to illustrate the present invention more clearly, the present invention will be further described below in conjunction with preferred embodiments. It should be understood by those skilled in the art that the content specifically described below is illustrative rather than restrictive, and should not limit the protection scope of the present invention with this.
[0128] Under the situation that the purpose of the present invention is clarified and explained by the following examples, the components of the composition are all explained in parts by weight as a general standard. Unless otherwise specified, for the sake of brevity, "parts" in the embodiments of the present invention have the same meaning as parts by weight.
[0129] Example 1
[0130] 1. Preparation of semi-blocked isocyanate (HBI), the formula is shown in the following table:
[0131] 1. The formula is shown in the table below:
[0132] Chinese name
Feed weight:g
Isophorone...
Embodiment 2
[0267] Same as Example 1, the difference is:
[0268] In the preparation of semi-blocked isocyanate (HBI):
[0269] The 2-ethylhexanol added to the blocking agent is changed to one or two of trimethylolpropane, methyl ethyl ketone oxime (MEKO), caprolactam, and ethylene glycol butyl ether, as long as the total equivalent ratio is 1:1;
[0270] The result is similar to Example 1.
Embodiment 3
[0272] Same as Example 1, the difference is:
[0273] In the preparation of semi-blocked isocyanate (HBI):
[0274] The polyisocyanate can be changed to aromatic, aliphatic, alicyclic diisocyanate or mixture thereof, such as TDI, P-MDI, IPDI, HDI and their polymers, as long as the equivalent ratio remains unchanged. ;
[0275] The result is similar to Example 1.
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Abstract
The invention discloses a cathodic electrophoretic coating capable of improving the yellowing of an automobile sealant, and a preparation method and application thereof. According to the invention, polyisocyanate and an epoxy main chain undergo oxazolidonization, and a mixed structure of a tertiary-amine-grafted epoxy-terminated quaternary ammonium salt 4N structure or ketoimine-epoxy resin-amidated primary amine salt 1N structure and a thio compound-rafted epoxy-terminated thio salt 3S structure is introduced at the same time; since a mixed component composed of 3S+4N or 3S+1N is used as a main dispersion emulsion of cathodic electrophoretic color paste, the dispersibility and storage stability of the cathodic electrophoretic color paste are guaranteed; the number of amino groups in the cathodic electrophoretic coating is greatly reduced, so amine substances released by a cathodic electrophoretic film during high-temperature baking of an automobile is substantially reduced; and influence on yellowing reactivity of a plasticizer in the automobile sealant is greatly decreased, and the situation that automobiles are returned to factories and production lines for reworking and maintenance due to yellowing of the sealant with time is eliminated.
Description
technical field [0001] The invention belongs to the technical field of synthesis of dispersion emulsions for cathodic electrophoretic coatings, and relates to the synthesis, preparation method and coating application of a modified epoxy resin emulsion having a quaternary ammonium salt structure or a primary amine salt structure and a thio salt structure at the same time technology. Background technique [0002] Cathodic electrophoretic coatings are generally composed of two packages consisting of main emulsion and dispersed color paste. Considering the stability, the two are put into the bath solution in proportion on the coating line for use. The type of hydrophilic group on the end group of the pigment-dispersed water-based resin has a great influence on the dispersibility, electrophoresis and corrosion resistance of the pigment. The emulsion is also based on the basic polymer resin with amine groups, so the water-based color paste dispersion resin should not only conside...
Claims
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Application Information
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