A kind of aziridine cross-linked acrylate resin two-component water-based automotive coating and preparation method thereof

An aziridine crosslinking agent and acrylate technology, which is applied in the field of organic polymer material preparation, can solve the problems of poor water resistance of the cured paint film, large carboxyl and hydroxyl residues in the paint film, and poor compatibility.

Active Publication Date: 2016-06-01
GUANGDONG YATU CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of aziridine cross-linked acrylate resin two-component water-based automotive coating and preparation method thereof
  • A kind of aziridine cross-linked acrylate resin two-component water-based automotive coating and preparation method thereof
  • A kind of aziridine cross-linked acrylate resin two-component water-based automotive coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Table 3 is that in the combination of functional monomer methacrylic acid and functional monomer acetoacetoxyethyl methacrylate in embodiment 1, the amount of acetoacetoxyethyl methacrylate is fixed at 10%, and the amount of methyl methacrylate is gradually increased. The dosage of acrylic acid is 7%, 8%, 9%, 10%, 11% and 14%. 6. There are 6 formulas in total. The 6 formulations of Example 1 all adopt 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, a condenser, a thermometer and an oil bath heating device. Acrylic acid, methyl methacrylate, styrene, acetoacetoxyethyl methacrylate, butyl acrylate, azobisisobutyronitrile and dodecyl mercaptan were dropped into the four-necked flask with a constant pressure funnel In 4h, drop it within 4h, keep it warm for 1h, dissolve the remaining azobisisobutyronitrile with 10 parts of ethylene glycol diethyl eth...

Embodiment 2

[0053] Table 5 Example 2 changes the basic formula of acrylic acid consumption to synthesize water-dispersible acrylate resin

[0054]

[0055] Table 5 shows that in the combination of functional monomer methacrylic acid and functional monomer acetoacetoxyethyl methacrylate in Example 2, the amount of acetoacetoxyethyl methacrylate is fixed at 10% and gradually increases the amount of acrylic acid 5.5%, 6.5%, 7.5%, 8.5%, 9.5% and 10.5%, while correspondingly reducing the amount of methyl methacrylate to synthesize the feeding formula of water-dispersible acrylate resin, the formula numbers are 7, 8, 9, 10, 11 and 12, a total of 6 recipes. The synthesis process of each recipe is the same.

[0056] According to the technological process of embodiment 1 synthetic water-dispersible type acrylate resin synthetic table 5 numbering is 6 kinds of water-dispersible type acrylate resins of 7~12, prepares aziridine according to the formula of embodiment 1 preparation coating and the ...

Embodiment 3

[0061] Table 7 Example 3 Change the amount of acetoacetoxyethyl methacrylate to synthesize the basic formula of water-dispersible acrylate resin

[0062]

[0063]Table 7 is that in the combination of functional monomer methacrylic acid and functional monomer acetoacetoxyethyl methacrylate in embodiment 3, the amount of methacrylic acid is fixed at 10% and gradually increases acetoacetoxyethyl methacrylate The dosage is 7%, 8%, 9%, 10%, 11% and 14%, and the feeding formula for synthesizing water-dispersible acrylic resin under the condition of correspondingly reducing the dosage of methyl methacrylate at the same time, its formula numbers are in order 13, 14, 15, 16, 17 and 18, a total of 6 recipes. The synthesis process of each recipe is the same.

[0064] According to the technological process of embodiment 1 synthesizing water-dispersible type acrylate resin, synthetic table 7 is numbered as 6 kinds of water-dispersible type acrylate resins of 13~18, prepares aziridine a...

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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 method for preparing a two-component water-based automotive coating of acrylate resin crosslinked with aziridine. Background technique [0002] According to the data of the National Bureau of Statistics, from 2000 to 2009, my country's coating production increased from 1.839 million tons per year to about 7.45 million tons per year. These coatings are widely used in petroleum, chemical, automobile, shipbuilding, metallurgy, electric power, machinery manufacturing And other fields, and the coatings used in these fields are almost all solvent-based coatings, the annual volatilization of organic solvents is as high as 2 million tons, and the waste of resources is about more than 11 billion yuan. Faced with the increasingly serious pollution of the paint industry, countries around the world have promulgated corresponding regulations to limit the use of sol...

Claims

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Application Information

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Patent Type & Authority Patents(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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