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Grafting emulsion and preparation method thereof

A technology of emulsion and solvent, applied in the field of coatings, can solve the problems of salt spray of paint film, aging time cupping performance and uneven distribution, etc., and achieve the effect of long aging time, good cupping performance and long time

Active Publication Date: 2021-07-30
武汉双虎涂料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this emulsion has the problem of uneven distribution during use, and the salt spray, aging time, and cupping properties of the paint film cannot be taken into account.

Method used

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  • Grafting emulsion and preparation method thereof

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Effect test

preparation example Construction

[0025] This specific embodiment also proposes the preparation method of the above-mentioned graft emulsion, including the following steps: according to the proportion of each component, methyl methacrylate, butyl acrylate, hydroxyethyl methacrylate, glycidyl methacrylate, benzene Mix ethylene and the first azobisisobutyronitrile, add the modified epoxy resin dropwise at 98-105°C, keep it warm for 1-2 hours, then continue to drop the first solvent and the second azo at 98-105°C Diisobutyronitrile mixture, heat preservation for 1-2 hours; after the heat preservation, add methylethanolamine and diethanolamine to the reaction kettle, raise the temperature to 110-120°C and keep it for 2-3 hours; then cool down to 65-70°C and continue to add Plasticizer, blocking cross-linking agent and organic acid are mixed, and water is continuously added and mixed to obtain the graft emulsion.

[0026] Further, the preparation method proposed in this specific embodiment also includes preparing t...

Embodiment 1

[0029] A blocking crosslinking agent, prepared by the following steps:

[0030] According to the mass percentage calculation in the reaction bottle, add isocyanate, 15% third solvent methyl isobutyl ketone and 0.02% organotin catalyst, feed nitrogen, start stirring, raise the temperature to 40°C, add octanol dropwise, during the reaction , the temperature of the reaction bottle does not exceed 70°C. After the drop, the isocyanate content is detected to be less than 0.5%, and then 4.88% of the third solvent methyl isobutyl ketone is added to obtain a blocked crosslinking agent; The ratio is 1:1.05, and the total amount of isocyanate and -OH-containing blocking agent accounts for 80% of the total mass of raw materials.

Embodiment 2

[0032] A blocking crosslinking agent, prepared by the following steps:

[0033] In the reaction bottle, according to the mass percentage calculation, add isocyanate, 6% of the third solvent methyl isobutyl ketone and 0.04% organic tin catalyst, feed nitrogen, start stirring, heat up to 45 ° C, dropwise add the blocking agent octanol, in During the reaction, the temperature of the reaction bottle does not exceed 70°C. After the dripping, it is detected that the isocyanate content is less than 0.5%, and then 3.96% of the third solvent methyl isobutyl ketone is added to obtain a blocked crosslinking agent; : The ratio of 1.05 is put in, and the total amount of isocyanate and octanol accounts for 90% of the total mass of raw materials.

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Abstract

The invention relates to a grafting emulsion and a preparation method thereof. The grafting emulsion is prepared from 4 to 8 parts of methyl methacrylate, 2.5 to 4 parts of butyl acrylate, 3 to 5 parts of hydroxyethyl methylacrylate, 1 to 3 parts of glycidyl methacrylate, 1 to 3 parts of styrene, 0.1 to 0.5 part of first azodiisobutyronitrile, 10 to 15 parts of modified epoxy resin, 2 to 5 parts of first solvent, 0.01 to 0.1 part of second azodiisobutyronitrile, 1 to 3 parts of plasticizer, 5 to 9 parts of closed crosslinking agent, 0.5-1 part of organic acid, 1-2 parts of diethanol amine, 2-5 parts of methylethanolamine and 50-80 parts of water. The invention also discloses a preparation method of the grafting emulsion. The salt spray time of an electrophoresis paint film prepared from the grafting emulsion under the cooperation of all the components is long and can reach 865 hours, the aging time can reach 688 hours, the single-side corrosion expansion at the scribing position is smaller than 2 mm, and the cupping test can reach 13 mm.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a graft emulsion and a preparation method thereof. Background technique [0002] The traditional electrophoretic paint is epoxy electrophoretic paint, which has poor aging resistance. After the frame of a commercial vehicle is assembled, it is generally placed in the parking lot, and the compartment is not equipped until it is sold, so the entire frame is always exposed to the outside. The traditional frame painting process is epoxy electrophoretic primer plus topcoat. However, due to the need to increase the site and labor of the topcoat, and the extensive use of solvent-based topcoats, environmental pollution has been caused. Therefore, in recent years, commercial vehicle frame factories mostly use bottom-surface-integrated electrophoretic paint, that is, use cationic acrylic emulsion and cationic epoxy emulsion cold-splicing process to prepare bottom-surface-integrated elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/10C08F220/14C08F220/18C08F220/20C08F220/32C08F212/08C09D151/08C09D5/44
CPCC08F283/10C09D151/08C09D5/4415C08F220/14C08F220/1804C08F220/20C08F220/325C08F212/08
Inventor 曾现策严刚刘亚枝李玉花吴田王清丹金其文阙雷锋
Owner 武汉双虎涂料股份有限公司