A polyisobutylene-based random copolymer with uniform structure and its preparation method
A polyisobutylene-based, random copolymer technology is applied in the field of isobutylene copolymer synthesis, which can solve the problems of large difference in reactivity ratio, unstable product performance, and uneven copolymer structure, so as to reduce heat generation and prevent glue The effect of particle bonding and improving production efficiency
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Embodiment 1
[0029] At -95°C, add 184g of methyl chloride, 40.5g of isobutylene and 26g of p-methylstyrene into the reactor, and mix well. The concentration of isobutylene monomer is 16.2wt%, and the content of p-methylstyrene is 10.4wt%. . Take 1.8ml trichlorotriethyldialuminum chloride solution (0.4M), 1.8mg water and 2.2ml ethanol solution (0.1M) in methyl chloride solution (0.1M), mix and configure it as an initiating system, then add 25ml methyl chloride solution to dilute, in- Low-temperature aging at 95°C for 5 minutes. Squeeze the aged initiator system into the reactor to initiate polymerization, the polymerization time reaches 69 hours sticking to the kettle, add 20ml of pre-cooled methanol to terminate the reaction, and vacuum dry. The number average molecular weight was 320000 g / mol.
[0030] Such as figure 1 As shown, in the synthesis process of polyisobutylene-based random copolymer, under the same conditions, without adding the third component, the exothermic heat is parti...
Embodiment 2
[0033]At -95°C, add 184g of methyl chloride, 40.5g of isobutylene and 26g of p-tert-butylstyrene to the reactor, then add 1.5ml of ethanol in methyl chloride solution (0.1M), mix well, and the concentration of isobutylene monomer is 12.43wt%, and the content of p-tert-butylstyrene is 13wt%. Take 1.8ml of trichlorotriethyldialuminum chloride solution (0.4M) and 3.89mg of water, mix to configure the initiation system, then add 25ml of methyl chloride to dilute, and age at -95°C for 5min at low temperature. Squeeze the aged initiator system into the reactor to initiate polymerization, the polymerization time reaches 40 hours without sticking to the kettle, add 20ml of pre-cooled methanol to terminate the reaction, and dry in vacuum. The number average molecular weight is 60000 g / mol.
Embodiment 3
[0035] At -95°C, 184g of methyl chloride, 40.5g of isobutylene and 26g of m-methylstyrene were added to the reactor and mixed thoroughly, the concentration of isobutylene monomer was 16.2wt%, and the content of m-methylstyrene was 10.4wt%. Take 1.8ml trichlorotriethyldialuminum chloride solution (0.4M), 3.89mg water and 1.5ml ethanol solution (0.1M) and mix them to form an initiating system, then add 25ml methyl chloride solution for dilution, Under the condition of ℃, low-temperature aging for 5 minutes. Squeeze the aged initiator system into the reactor to initiate polymerization, the polymerization time reaches 40 hours without sticking to the kettle, add 20ml of pre-cooled methanol to terminate the reaction, and dry in vacuum. The number average molecular weight is 100000 g / mol.
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