A polymer composition of two-arm styrene-conjugated diene and its preparation and application in asphalt modification
A technology of conjugated diene and polymer, which is applied in the direction of building structure, building components, building insulation materials, etc., can solve the problems of insufficient dynamic viscosity, poor processing performance of asphalt modification, and difficult to disperse, so as to improve the anti-rutting performance , improved elongation, and good processing performance
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Embodiment 1
[0070] Example 1 - Polymer 1:
[0071] Add 1500g of cyclohexane and 0.3g of tetrahydrofuran into the first reaction kettle, add 3.4ml (0.5mol / l) n-butyllithium as an initiator, raise the temperature to 50°C, add 22g of styrene into the reaction kettle, and react for 25min , then add 88g of isoprene, react for 30 minutes and set aside. Add 1500g of cyclohexane and 0.3g of tetrahydrofuran into the second reaction kettle, add 7.7ml (0.5mol / l) n-butyllithium as an initiator, raise the temperature to 50°C, add 50g of styrene into the reaction kettle, and react for 25min , then add 200g of butadiene, react for 30min, then add 7.1ml (0.31mol / l) of dichlorodimethylsilane in the kettle, react at 60°C for 40min, and use gel permeation chromatography (GPC) for sampling , The molecular weight and distribution of the product were measured. Next, add the styrene-isoprene polymer solution in the first reactor to this part of the coupled reaction system, and react at 60°C for 40 minutes to ...
Embodiment 2
[0077] According to the way of polymer 1, only the addition amount of butadiene and styrene SB polymerization initiator n-butyllithium is changed to 3.85ml (0.5mol / l), and the addition amount of SI polymerization initiator n-butyllithium is 2.75ml (0.5 mol / l), the molecular weight of the SB polymer is 77,690 g / mol, the molecular weight of the SI polymer is 80,350 g / mol, and the diblock content is 10%.
[0078] Polymer solution, (SB) 2 X two-arm polymer 71%;
[0079] (SB)X(IS) asymmetric two-arm polymer 19%;
[0080] SB block polymer 5%;
[0081] SI block polymer 5%.
Embodiment 3-6
[0083] According to the method of polymer 1, four kinds of linear coupling polymers with different coupling agents were prepared. Table 1 lists the polymer reactions and test results.
[0084] Table 1
[0085]
[0086] The response of different couplers is emphasized, as is the distribution of the ambedding structure in the other cases.
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