Butadiene-isoprene copolymer and its preparation method
A technology of isoprene and butadiene, applied in the field of butadiene-isoprene copolymer and its preparation, can solve the problems of poor performance of polymerization products, unfavorable industrial promotion and application, and environmental pollution, etc., and achieve good The effect of stability and ease of use in large-scale industrial production
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[0019] One aspect of the present invention provides a method for preparing a butadiene-isoprene copolymer, the method comprising: polymerizing butadiene and isoprene in an organic solvent in the presence of a homogeneous rare earth catalyst ;
[0020] Wherein, the homogeneous rare earth catalyst is a homogeneous solution containing component A, component B, component C, component D and component E;
[0021] Component A: neodymium phosphonate compounds represented by formula (1);
[0022] Component B: an alkylaluminum compound selected from one or more of trialkylaluminum and dialkylaluminum hydride;
[0023] Component C: a halogenated compound, the halogenated compound is selected from one or more of haloalkylaluminum, halosilane and sesquihaloalkylaluminum;
[0024] Component D: conjugated diene;
[0025] Component E: the compound shown in formula (2);
[0026] Formula 1) Formula (2)
[0027] Among them, R a1 , R a2 , R b1 , R b2 , R c1 , R c2 , R d1 , R d2 a...
preparation example 1
[0070] 30mL of hydrochloric acid (concentration: 12mol / L) was added to 0.05mol of Nd2O3, then heated to boiling and stirred for 30min, the obtained NdCl aqueous solution was lavender and transparent. Add 0.3 mol of bis(2-ethylhexyl) phosphonate acetone solution (180 mL of acetone) into 450 mL of sodium hydroxide aqueous solution (sodium hydroxide content is 0.3 mol), mix well to obtain a light yellow solution, and then add Stir and mix the above NdCl aqueous solution to obtain a suspension containing fine white granular precipitates, filter and wash the filter cake 3 times with appropriate amount of distilled water and acetone respectively, and then place it in an oven at 60°C for 72 hours to obtain bis(2-ethyl Neodymium phosphonate.
[0071] Catalyst preparation example 1
[0072] Under nitrogen protection, 250mL of hexane, 3.5mmol of bis(2-ethylhexyl)phosphonate neodymium, 1.75mmol of bis(2-ethylhexyl)phosphonate and 140mmol of butadiene were mixed at 20°C Mix for 30 minut...
preparation example 2
[0074] This example is used to illustrate the homogeneous rare earth catalyst and its composition of the present invention.
[0075] Under nitrogen protection, 250mL of hexane, 3.5mmol of bis(2-ethylhexyl)phosphonate neodymium, 1.75mmol of bis(2-ethylhexyl)phosphonate and 175mmol of butadiene were mixed at 20°C Mix for 30 minutes, then add 17.5 mL of a hexane solution of diisobutylaluminum hydride with a concentration of 1 mol / L at 30°C and stir and mix for 30 minutes, then raise the temperature to 60°C, and then add 10.5 mL of diisobutylaluminum hydride with a concentration of 1 mol / L A hexane solution of ethyl aluminum chloride, and aged for 2h to obtain a catalyst in a homogeneous solution state, that is, a homogeneous rare earth catalyst C1, wherein the content of Nd element is 0.0119mmol / mL; two (2-ethylhexyl) The molar ratio of neodymium phosphonate, diisobutylaluminum hydride, diethylaluminum chloride, butadiene and bis(2-ethylhexyl)phosphonate is 1:5:3:50:0.5.
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