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Paint composition and preparation and using methods thereof
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A composition and coating technology, which can be applied to epoxy resin coatings, coatings, devices for coating liquid on surfaces, etc. The effect of adhesion and good mechanical properties
Active Publication Date: 2011-04-06
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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However, if the photoinitiator content is too large, the curing rate of the paint film will be too fast during the UV curing process, resulting in large shrinkage of the cured paint film, large residual stress, and cracking of the cured paint film.
Too much photoinitiator content in the coating also makes the coating species remain more photoinitiator after UV curing, which affects the weather resistance of the cured paint film
In addition, the hardness of the paint film after the above-mentioned waterborne epoxy acrylate photocuring also needs to be improved
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[0055] The present invention also provides a preparation method of the above-mentioned coating composition, comprising:
[0056] Add water-based epoxy acrylate, photoinitiator and cross-linking agent to the auxiliary agent under stirring state, and then filter.
[0057] Concrete preparation process is preferably as follows:
[0058] a) Put the leveling agent and defoamer in the mixer and mix evenly, set the stirring speed to 700rpm-900rpm, stir for 10min-20min, add water-based epoxy acrylate, and increase the stirring speed to 1200rpm-1400rpm and stir 2h~4h.
[0059] b) Add co-solvent, photoinitiator and water-based crosslinking agent to the mixture obtained in step a, set the stirring speed to 1400rpm-1600rpm, stir for 25min-40min and then filter with a 200-mesh filter to obtain a water-based epoxy acrylate coating.
[0060] The using method of coating composition provided by the invention is as follows:
[0061] After the coating composition is sprayed on the surface of t...
Embodiment 1～ Embodiment 6
[0075] The coating composition of above-mentioned 6 embodiments all is to prepare according to the following method:
[0076] 1. Add the leveling agent and defoamer to the paint tank, set the stirring speed to 800rpm, stir for 15 minutes, add water-based epoxy acrylate, set the stirring speed to 1300rpm, and stir for 2.5 hours.
[0077] 2. Add a cosolvent, a photoinitiator and a crosslinking agent to the mixture obtained in step 1, set the stirring speed to 1500 rpm, stir for 30 minutes, and filter with a 200-mesh filter to obtain a coating composition.
[0078] Above-mentioned 6 embodiment raw materials and consumption are listed in Table 2.
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Abstract
The invention provides a paint composition, which comprises waterborne epoxyacrylate, a photoinitiator, a crosslinking agent and an auxiliary in the weight ratio of 35-62:0.5-3:13-24:3.5-12.5. The invention also provides a method for preparing the paint composition, which comprises the following steps of: adding the waterborne epoxyacrylate, the photoinitiator and the crosslinking agent into the auxiliary under stirring; and filtering after complete stirring. The invention also provides a method for using the paint composition, which comprises the following steps of: spraying the paint composition on the surface of a substrate, and curing by ultravioletradiation; and baking and thermally curing the substrate after radiation. A paint film formed after the paint composition is subjected to ultravioletray-heat dual curing has higher mechanical performance, wherein the adhesive force is between 0 and 1 level, the flexibility is 1mm, and the hardness is between 4 and 5H.
Description
technical field [0001] The invention relates to the field of coatings, in particular to a coating composition and a preparation method and application method thereof. Background technique [0002] Epoxyacrylate is an oligomer produced by the ring-opening esterification reaction of epoxy resin and acrylic acid or epoxy resin and methacrylic acid. Epoxy acrylate has excellent water resistance, weather resistance, corrosion resistance and thermal stability, good adhesion, and has both the hardness and mechanical properties of epoxy resin. Epoxy acrylate contains carbon-carbon unsaturated double bonds, which are prone to photocuring under the action of photoinitiators. Therefore, epoxy acrylate is widely used as the main film-forming resin of photocurable coatings. [0003] Although epoxy acrylate has the above advantages, it needs to add a large amount of organic solvents such as toluene and xylene to achieve the construction viscosity when it is prepared into a coating. The ...
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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/10C09D7/12B05D3/02B05D3/06
Inventor 张红明李季王献红王佛松
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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