Secondary curing moulding hardening coating sheet and preparation method
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A secondary curing and hardening coating technology, applied in coatings, epoxy resin coatings, devices for coating liquids on surfaces, etc. Excellent stretchability, excellent adhesion, not easy to peel off
Inactive Publication Date: 2019-07-09
SICHUAN LONGHUA FILM CO LTD
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Problems solved by technology
[0003] At present, 2.5D mobile phone back covers and simple flat displays are facing elimination because they cannot meet people's needs. 3D mobile phone back covers, integrated car covers, 3D curved shape displays and other components have become the general trend
However, in the existing technology, it is difficult to take into account the formability and hardenability of the hardened coated plate with one-time UV curing. The coating must have low hardness and high flexibility to meet the requirements of forming without cracking, but such products have low hardness and poor mechanical properties. Scratch scratches, the life of the product is shorter
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Embodiment 1
[0024] A PC / PMMA two-layer co-extruded composite material sheet with a thickness of 0.64 mm and a size of 1270 mm×1690 mm was selected as the base material of this embodiment.
[0025] Undercoating, the solution of 22 parts by weight of main agent A, the solution of 2.2 parts by weight of curing agent B, the solution of 0.020 parts by weight of catalyst C, and the organic solvent of 75 parts by weight are fully stirred and mixed uniformly to prepare the primer coating.
[0026] Wherein, the solution of main agent A includes 30% acrylate, 46.7% ethyl acetate and 23.3% methyl ethyl ketone by mass fraction, and the solution of curing agent B includes 40% isocyanate curing agent and 60% by mass fraction. % ethyl acetate, catalyst C is 25% dibutyltin dilaurate and 75% ethyl acetate, and the organic solvent is methyl isobutyl ketone.
[0027] Apply the primer coating uniformly on the PMMA surface of the substrate in a flat coating, and then bake at a temperature of 110°C for 6 minut...
Embodiment 2
[0039] (1) A PC sheet with a thickness of 0.80 mm and a size of 1270 mm×1690 mm is selected as the base material of this embodiment.
[0040] (2) Undercoating, the main agent A of 35 parts by weight, the curing agent B of 3.5 parts by weight, the catalyst C of 0.035 parts by weight, and the organic solvent of 61 parts by weight are fully stirred and mixed uniformly to prepare the primer coating.
[0041] Main agent A is 30% acrylate, 46.7% ethyl acetate and 23.3% methyl ethyl ketone, curing agent B is 40% isocyanate curing agent and 60% ethyl acetate, catalyst C is 25% Dimethyl tin neodecanoate and 75% ethyl acetate, the organic solvent is methyl isobutyl ketone.
[0042] Apply the primer coating evenly on the PMMA surface of the substrate in a flat coating, and then bake it at a temperature of 120°C for 5 minutes. After the baking is completed, the primer sheet is obtained and cooled at room temperature stand-by.
[0043](3) Topcoat, fully stir and mix 75 parts by weight of...
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Abstract
The invention discloses a secondary curing moulding hardening coating sheet and a preparation method. The preparation method comprises the following steps of (1), selecting an optical plastic film sheet according to coating specifications; (2), coating one surface of the selected sheet with base coat with high adhesion for the first time, then baking until the coating is dry to obtain a base coatsheet, and cooling the base coat sheet for use; (3), coating the coating of the base coat sheet prepared in step (2) with surface coating allowing secondary curing for the second time, then baking until the surface of the coating is dry to obtain a primarily cured sheet; and (4), according to the shape requirements of the product moulding, carrying out hot pressing or vacuum moulding on the primarily cured sheet, baking at a certain temperature for a certain time, and then curing and hardening by an ultraviolet light to obtain a secondarily cured finished product. The method takes the moldability and high hardenability of hardening coating plates into account and ensures that the coating has excellent stretchability during molding without appearing cracks.
Description
technical field [0001] The invention relates to the technical field of polymer materials, in particular to a secondary cured formable hardened coated sheet and a preparation method. Background technique [0002] With the improvement of living standards, electronic products such as mobile phones have become an indispensable part of people's lives, and cars have become a common means of transportation for people's daily travel. In order to adapt to the aesthetic appearance, special functions, and performance of smart phones and cars PC, PMMA, PC / PMMA composite sheet and other plastic hardened coated products are widely used in smartphone casings and car covers due to their advantages of light weight, low manufacturing cost, and wide range of functions. Important components for mobile phones or automobiles such as boards and 3D curved displays. [0003] At present, 2.5D mobile phone back covers and simple flat displays are facing elimination because they cannot meet people's n...
Claims
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Application Information
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