Free radical-curable acrylic polyol resin composition for manufacturing quartz-based artificial stone with improved uv radiation and weather resistance

Thermal curable hydroxyl-containing acrylic resin composition (acrylic polyol resin), curing by free radical reaction with a catalyst-accelerator which is an oxidation-reduction system, for manufacturing artificial stone to enhance UV and weather resistance, wherein the composition comprising:

• (a) ultraviolet radiation and weather-resistant acrylic polyol resin synthesized from monomer n-butyl methacrylate (n-BMA), styrene, hydroxyethyl methacrylate (HEMA), or 2-hydroxyethyl acrylate (HEA) with the following component ratios:
• (i) n-BMA in the range of 51.5% to 60.5% by weight,
• (ii) styrene in the range of 5.0% to 15.5% by weight,
• (iii) HEMA or HEA in the range of 33.5% to 45.6% by weight,
• (iv) synthesis reaction initiator chosen from the group consisting of dibenzoyl peroxide or di-t-butyl peroxide or azo-di-isobutylronitrile or a combination thereof in the range of 0.01% to 2% by weight calculated by the total weight of the reaction mixture;
• (b) curing catalysts, which is organic peroxide compound, chosen from group consisting of tert-butylperoctoate;
• tert-butyl peroxybenzoate;
• tert-butyl peroxy-3,5,5-trimethylhexanoate;
• ter-butylperoxy-pivalate;
• tert butyl peroxy-2 ethylhexanoate;
• tert butyl peroxy-isobutyrate;
• tert butyl-monoperoxy-maleate;
• tert butyl peroxy-neoheptanoate;
• tert butylperoxy-neodecanoate;
• di(4-methyl benzoyl)peroxide;
• diluaroyl-peroxide;
• 2,5-dimethyl-2-5-di(2-ethylhexanoylperoxy)hexane;
• di(3,5,5-trimethyl-hexanoyl)peroxide;
• tert amylperoxy-neodecanoate;
• 1,1,3,3-tetramethylbutylperoxy-neodecanoate or combination thereof in range from 0.1 to 5% by weight calculated by the weight of the acrylic polyol resin;
• (c) curing accelerator chosen from a group consisting of cobalt (II) salt compounds, preferably cobalt (II) octoate, or manganese salts in the range of 0.005% to 1% by weight calculated by the weight of the acrylic polyol resin.