| CPC B32B 5/32 (2013.01) [B32B 5/18 (2013.01); B32B 2250/22 (2013.01); B32B 2264/104 (2013.01); B32B 2266/0235 (2013.01); B32B 2307/4026 (2013.01); B32B 2307/546 (2013.01); B32B 2307/558 (2013.01); B32B 2307/7145 (2013.01); B32B 2419/00 (2013.01)] | 6 Claims |
|
1. A wide low-temperature impact-resistant and bending-resistant polyvinyl chloride (PVC) foam co-extruded sheet, comprising a core layer and a skin layer, the core layer comprising following raw materials in parts by weight:
a PVC resin powder: 50-80 parts;
a silicone-methyl methacrylate-ethyl acrylate composite low-temperature toughening and reinforcing agent: 3-6 parts;
a filler: 10-25 parts;
a foaming regulator I: 5-15 parts;
a white foaming agent: 1-4 parts;
a calcium-zinc stabilizer: 3-6 parts;
a cold-resistant plasticizer: 3-6 parts;
stearic acid 0.1-0.5 parts;
a polyethylene wax: 0.2-1.1 parts; and
an oxidized polyethylene wax: 0.2-0.8 parts; and
the skin layer comprising the following raw materials in parts by weight:
the PVC resin powder: 60-100 parts;
the silicone-methyl methacrylate-ethyl acrylate composite low-temperature toughening and reinforcing agent: 5-9 parts;
an activated nano-silica: 1-3 parts;
a foaming regulator II: 2-5 parts;
a composite foaming agent: 0.3-1.2 parts;
the calcium-zinc stabilizer: 4-5 parts;
a composite weather-resistant modifier: 2-5 parts;
rutile titanium dioxide: 3-8 parts;
the polyethylene wax: 0.2-1.1 parts;
the oxidized polyethylene wax: 0.2-0.5 parts;
the cold-resistant plasticizer: 2-4 parts; and
a compound antibacterial and mildewproof agent: 0.5-1.5 parts,
wherein
the silicone-methyl methacrylate-ethyl acrylate composite low-temperature toughening and reinforcing agent comprises the following raw materials in percentage by mass: 55-85% of silicone emulsion, 5-15% of ethyl acrylate, and 10-30% of methyl methacrylate;
a method for preparing the silicone-methyl methacrylate-ethyl acrylate composite low-temperature toughening and reinforcing agent comprises following steps:
(1) adding 70% by mass of water and sodium dodecyl benzene sulfonate to a reaction kettle, stirring and reacting at 55° C. for 1.5 h to obtain a first mixture;
(2) adding methyl triethoxysilane and the remaining water to a reaction kettle for stirring, with a stirring speed of 500 r/min; and then warming to 60° C. and adjusting the stirring speed to 3000 r/min, adding the first mixture, and continuing a reaction for 5 h after completion of a dropwise addition to obtain the silicone emulsion;
(3) mixing ethyl acrylate and methyl methacrylate evenly according to a mass ratio, and then adding benzoyl peroxide to dissolve a mixture of ethyl acrylate and methyl methacrylate and obtain a second mixture; and
(4) simultaneously dropping the silicone emulsion and the second mixture into n-butanol for 4 h, thereafter adjusting a pH of a solution to 7, then stirring and reacting for 4.5-5 h at a temperature maintained between 100-105° C. to form a salt by neutralization, drying and pelletizing to obtain the silicone-methyl methacrylate-ethyl acrylate composite low-temperature toughening and reinforcing agent,
wherein in the preparation of the silicone emulsion, sodium dodecyl benzene sulfonate accounts for 5% by mass, methyl triethoxysilane accounts for 60% by mass, and the balance is water, wherein the PVC foam co-extruded sheet comprises a width of up to 1560 millimetre (mm).
|