Component Amount / mol Component Amount / mol
Dimethyl Terephthalate 80 1,4 butanediol 200
Dimethyl Isophthalate 20 Tetra-n-butyl titanate 0.03
Dimer acid (fat dibasic acid with 36 carbon atoms) 30 Hydrogenated liquid polybutadiene diol 15
After preparing dimethyl terephthalate, dimethyl isophthalate, dimer acid and butane diol, adding 0.01 mol of catalyst tetra-n-butyl titanate and heating under nitrogen protection at 200Â° C. for 1 hour for esterification exchange. Then, hydrogenated liquid polybutadiene diol and tetra-n-butyl titanate 0.02 mol were added, and polycondensation was performed by heating under vacuum at 240Â° C. for 4 h. The resulting polyester elastomer copolymer was hot-pressed at 180[deg.] C. into a film of about 75 [mu]m for bonding aluminum plates and polypropylene plates. However, the copolymer melt viscosity is too high, difficult to coat, so add 2% mol of butanediol, depolymerization under nitrogen protection at 240 Â°C depolymerization 1.5h, the obtained polyester elastomer copolymer is easy to use hot melt coating Cloth machine for coating, made of thin film.
Source: 21st Century Fine Network
UPVC Doors offer a low maintenance solution, they also keep your home warm and by keeping noise and draughts out your guaranteed a more relaxing homely atmosphere, all pvc doors offer unrivalled security with hinges and locks that are fitted directly to the door`s steel reinforcement.
We all want a door that`s long lasting and secure, that`s why we offer a 10-year guarantee on materials and workmanship, and a 5 year guarantee against fog and condensation in the sealed units.
We know how important it is for you to fit stylish PVC doors that are built to last but not have to pay prices which will break the bank. For safety and security, all of our glazed UPVC External Doors are fitted with toughened safety glass. We believe our hinges to be the best on the market, allowing door adjustment on all 3 planes (Horizontal, Vertical and Lateral) of up to an amazing 6mm.
Upvc Doors,Upvc Patio Doors,Upvc Exterior Doors,Upvc Double Doors
Lingyin Construction Materials LTD , http://www.lingyincn.com