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Acrylic-based varnish compositions, varnishes and applications thereof
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A technology of varnish and hydroxyacrylic acid, which is applied in the field of coatings, can solve the problems of reducing acid resistance, and achieve excellent acid resistance, good mechanical properties, and environmental friendliness
Active Publication Date: 2022-02-08
NIPPON PAINT CHINA
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Problems solved by technology
Compared with the two-component varnish of the hydroxyl-isocyanate crosslinking system, the one-component varnish is easier to hydrolyze in acidic environment, thus greatly reducing the acid resistance, which has always been the biggest weakness of the one-component varnish
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[0110] Simultaneously with the following initiator mixture, specifically: 200 parts of 2-ethylhexanoic acid tert-butyl Kayaester O (Akzo Nobel Company), 159 parts of di-tert-amy...
Embodiment 1
[0117] The formulation of the clear varnish coating is shown in Table 1 below. Its preparation method comprises the following steps:
[0119] 2) At the speed of 300-500rpm, add TINUVIN 292, TINUVIN 384-2, BYK358N and BYK 310 to the main cylinder a in sequence, and continue to stir for 30 minutes after the addition is complete;
[0120] 3) Add n-butanol to the auxiliary vat b, then add AAC 2500 at a constant speed of 200-400rpm, and continue to stir for 15 minutes; then stir the mixture in the obtained auxiliary vat b at 300-500rpm in the main vat a In the state of , add it to the main cylinder a, and continue to stir for 20 minutes after the addition is complete;
[0121] 4) At a speed of 300-500rpm, add blocked isocyanate B and acryli...
Embodiment 2
[0130]The preparation method is the same as in Example 1, except that the acrylic resin A in step 4) is replaced by ETERAC7393-S-80, and the blocked isocyanate B is replaced by Desmodur BL 3175A.
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Abstract
The invention discloses an acrylic-based varnish composition, which comprises the following components in parts by weight: 20-30 parts of high-solid thermosetting hydroxyl acrylic resin; 3-8 parts of polycarbonatepolyol; etherified amino 20-30 parts of resin; 5-10 parts of urethane-type amino resin; 3-8 parts of blocked isocyanate crosslinking agent; 20-30 parts of diurea compound modified acrylic resin; 2-5 parts of varnish additive; varnishDiluent 10‑15 parts. The finish cleaning composition is environmentally friendly, has high appearance, high performance, especially excellent acid resistance. The invention also discloses the varnish comprising the varnish composition and the application of the varnish.
Description
technical field [0001] The invention relates to the technical field of coatings. More particularly, it relates to an acrylic-based clearcoat composition, varnish and applications thereof. Background technique [0002] Since the beginning of the 21st century, China's auto production and sales have grown rapidly and have reached the number one position in the world. Environmental problems caused by automotive coatings and coatingengineering have increasingly become the focus of social attention. In 2015, the Ministry of Finance and the State Administration of Taxation issued a 4% consumption tax on paints with a volatile organic compound (VOCs) content greater than 420g / L under construction. In addition, they also officially began to charge for VOCs emissions. [0003] As the outermost coating in automotive coatings, varnish has high technical requirements for appearance and various properties such as weather resistance and chemical resistance. As a technical direction, wa...
Claims
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