Dialkyl terephthalates and their use
A technology of dialkyl terephthalate and dialkyl phthalate, which is applied in the field of dialkyl terephthalate, can solve the problems such as the decline in the application of short-chain phthalates, and achieve volatile The effect of reduced resistance and good storage stability
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Embodiment 1
[0099] Embodiment 1: preparation di-n-pentyl terephthalate
[0100] 679 g (3.5 mol) of dimethyl terephthalate (Oxxynova company), 1.7g of tetrabutyl orthotitanate (0.25% by mass, based on DMT, DuPont Company, Tyzor TnBT) and first a total of 748g (8.5 moles) of 200g of n-amyl alcohol (greater than 99% purity, FLUKA Company) and It was heated slowly until a homogeneous mixture of DMT and alcohol was obtained, then the stirrer was turned on. The fractionation head was adjusted so that the overhead temperature was kept constant at about 65°C (the boiling point of methanol). From a bottom temperature of about 185° C., the remaining alcohol was fed slowly so that the temperature in the flask did not drop below 180° C. and sufficient reflux was maintained for distillation. The withdrawn distillate was assayed by means of GC analysis to determine the amount of methanol separated off. Samples were taken from the reaction flask every 30 minutes after a large amount of methanol (appr...
Embodiment 2
[0102] Embodiment 2: preparation di-n-butyl terephthalate
[0103] 679 g (3.5 moles) of dimethyl terephthalate (Oxxynova), 1.7 g of tetrabutyl orthotitanate (0.25% by mass, based on DMT, DuPont, Tyzor TnBT) and first 200 g of a total of 629 g (8.5 moles) of n-butanol (European Oxo, purity 99.9%) were treated with Heat slowly until a homogeneous mixture of DMT and alcohol is obtained, then turn on the stirrer. The fractionation head was adjusted so that the overhead temperature was kept constant at about 65°C (the boiling point of methanol). From a bottom temperature of about 185°C, the remaining alcohol was fed slowly so that the temperature in the flask did not drop below 180°C and a suitable reflux was maintained. The withdrawn distillate was assayed by means of GC analysis to determine the amount of methanol separated off. Samples were taken from the reaction flask every 30 minutes after a large amount of methanol (approximately 90% of the expected 7 moles of methanol) h...
Embodiment 3
[0105] Embodiment 3: preparation plastisol
[0106] The weighings of the components used in each of the plastisols 1-3 are given in Table 1 below.
[0107] Table 1: Formulations (all given in phr (= parts by mass per 100 parts by mass of PVC))
[0108]
[0109] The temperature was adjusted to 25°C before adding the plasticizer. First the liquid components and then the powder components were added to the PE beaker. The mixture was stirred manually with the aid of a slurry scraper so that no unwetted powder remained. The mixing beaker was then clamped in the clamping device of the dissolution stirrer. Set the stir bar to 1800 rpm before immersing the stir bar in the mixture. Stir for a while after the stirrer is turned on, until a temperature of 30.0° C. is reached on the digital display of the temperature sensor. This ensures that the plastisol is homogenized when a defined energy is introduced. Then, immediately adjust the plastisol temperature to 25.0°C.
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Abstract
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