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Aziridine crosslinked acrylate resin two-component water-based automobile coating and preparation method thereof

A technology of aziridine crosslinking agent and acrylate, which is applied in the field of organic polymer material preparation, and can solve the problems of large carboxyl and hydroxyl residues, poor compatibility, and poor dispersion of paint films

Active Publication Date: 2014-01-29
GUANGDONG YATU CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The test shows that the water resistance of the cured paint film is not good, whether the crosslinking agent used is water-based amino resin or blocked diisocyanate, and it fails to meet the requirement that the automotive finish paint film must withstand immersion in warm water at 40°C for more than 10 days. It is caused by the poor compatibility of amino resins and blocked diisocyanates with water-dispersed acrylate resins, poor dispersion in water-based coatings, resulting in low cross-linking efficiency and large residual carboxyl and hydroxyl groups in the paint film.

Method used

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  • Aziridine crosslinked acrylate resin two-component water-based automobile coating and preparation method thereof
  • Aziridine crosslinked acrylate resin two-component water-based automobile coating and preparation method thereof
  • Aziridine crosslinked acrylate resin two-component water-based automobile coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Table 3 shows the combination of the functional monomer methacrylic acid and the functional monomer acetoacetoxyethyl methacrylate in Example 1. The amount of acetoacetoxyethyl methacrylate is fixed at 10%, and the methyl group is gradually increased. The dosage of acrylic acid is 7%, 8%, 9%, 10%, 11% and 14% to synthesize water-dispersible acrylate resin feeding formula, the formula number is 1, 2, 3, 4, 5 and 6. There are 6 recipes in total. The six formulations of Example 1 all use the same synthesis process as follows.

[0044] Add 25 parts of ethylene glycol diethyl ether and 15 parts of isopropanol into a four-necked flask equipped with a stirrer, condenser, thermometer and oil bath heating device. Under the protection of nitrogen, the temperature is raised to 105°C, and the amount of The mixture of acrylic acid, methyl methacrylate, styrene, acetoacetoxyethyl methacrylate, butyl acrylate, azobisisobutyronitrile and dodecyl mercaptan is dropped into the four-necked ...

Embodiment 2

[0053] Table 5 Example 2 The basic formula for synthesizing water-dispersed acrylic resin by changing the amount of acrylic acid

[0054]

[0055] Table 5 is Example 2 in the combination of functional monomer methacrylic acid and functional monomer acetoacetoxyethyl methacrylate, the amount of acetoacetoxyethyl methacrylate is fixed at 10% and the amount of acrylic acid is gradually increased It is 5.5%, 6.5%, 7.5%, 8.5%, 9.5%, and 10.5%, while correspondingly reducing the amount of methyl methacrylate. Under the condition of correspondingly reducing the amount of methyl methacrylate, the compounding formula of water-dispersible acrylate resin, the formula number is 7, There are 6 recipes in 8, 9, 10, 11 and 12. The synthesis process of each formula is the same.

[0056] According to the process of synthesizing water-dispersed acrylate resin in Example 1, the 6 water-dispersed acrylate resins numbered 7-12 as shown in Table 5 were synthesized, and the aziryl was prepared according...

Embodiment 3

[0061] Table 7 Example 3 The basic formula for synthesizing water-dispersed acrylic resin by changing the amount of acetoacetoxyethyl methacrylate

[0062]

[0063] Table 7 shows Example 3 in the combination of functional monomer methacrylic acid and functional monomer acetoacetoxyethyl methacrylate, the amount of methacrylic acid is fixed at 10% and acetoacetoxyethyl methacrylate is gradually increased. The dosage is 7%, 8%, 9%, 10%, 11%, and 14%. At the same time, the dosage of water-dispersible acrylate resin is synthesized under the condition of correspondingly reducing the amount of methyl methacrylate. The formula number is as follows There are 6 recipes in 13, 14, 15, 16, 17, and 18. The synthesis process of each formula is the same.

[0064] According to the process for synthesizing water-dispersed acrylate resin in Example 1, the 6 water-dispersed acrylate resins numbered 13-18 as shown in Table 7 were synthesized, and aziryl was prepared according to the formulation of t...

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Abstract

The invention discloses aziridine crosslinked and solidified acrylate resin two-component water-based automobile coating and a preparation method thereof. Water-dispersed acrylate resin used for preparing the two-component water-based coating is prepared by initiating polymerization by virtue of a free radial initiator in an organic cosolvent by a mixture of a monomer component A, a monomer component B and a monomer component C, and then an amine neutralizer is added for neutralization to form aqueous dispersion. The aziridine crosslinked acrylate resin two-component water-based automobile coating is formed by mixing water-dispersed acrylate resin, an aziridine crosslinking agent and other auxiliaries, a paint film formed after spraying and solidification has high gloss, high hardness, high impact resistance and excellent water resistance, interlayer bonding is tight, firm adhesion on a substrate is achieved, and operating requirements of automobile coating are met.

Description

Technical field [0001] The invention belongs to the technical field of organic polymer material preparation, and relates to a preparation method of an acrylic resin two-component waterborne automotive paint crosslinked with aziridine. Background technique [0002] According to the National Bureau of Statistics, from 2000 to 2009, my country’s paint output increased from 1.839 million tons / year to 7.45 million tons / year. These coatings are widely used in petroleum, chemical, automotive, shipbuilding, metallurgy, electric power, and machinery manufacturing. In other fields, almost all the coatings used in these fields are solvent-based coatings. The annual organic solvent volatilization is as high as 2 million tons, and the waste of resources is about 11 billion yuan. Facing the increasingly serious pollution in the coating industry, countries around the world have successively promulgated corresponding regulations to restrict the use of solvent-based coatings. In the context of en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D133/12C09D133/08C09D7/12C08F220/14C08F220/18C08F212/08C08F220/06C08F2/38
Inventor 张育波王炼石阮伟明陈容爱李柏文冯兆华
Owner GUANGDONG YATU CHEM
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