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Application of 1, 2-dialkoxy propane as polarity regulator for synthesizing high vinyl aryl ethylene-conjugated diene block copolymer

A technology of dialkoxypropane and high vinyl styrene, which is applied in the field of styrene-butadiene rubber synthesis, can solve the problem of no display ratio relationship, etc., and achieve the effect of outstanding elastic properties

Pending Publication Date: 2022-03-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no experimental data showing the vinyl content of the synthesized conjugated diene polymers in relation to the ratio of controller to initiator

Method used

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  • Application of 1, 2-dialkoxy propane as polarity regulator for synthesizing high vinyl aryl ethylene-conjugated diene block copolymer
  • Application of 1, 2-dialkoxy propane as polarity regulator for synthesizing high vinyl aryl ethylene-conjugated diene block copolymer
  • Application of 1, 2-dialkoxy propane as polarity regulator for synthesizing high vinyl aryl ethylene-conjugated diene block copolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5

[0034] SBS block copolymers using the preferred polarity regulators of the present invention: SBS block copolymerization in the high temperature range.

[0035] Cyclohexane (2500 mL) was charged to a 5 liter stainless steel stirred reactor under a nitrogen atmosphere. The solvent temperature was stabilized at 50 °C by circulating water inside the reactor and the reactor temperature control was turned off. Then, a first portion of styrene monomer (41 mL) was loaded into the reactor. The styrene feed operation was completed within 0.5 minutes. Thereafter the reactor temperature control was stopped. Thereafter, DMP and n-butyllithium initiator were added to the reactor. The active initiator content and the molar ratio of polar modifier to initiator are shown in the table. Then, a waiting time of 30 minutes was implemented and the feed of butadiene (324 mL) was completed over a period of about 2 minutes. The heat of butadiene polymerization raised the reaction initiation temp...

Embodiment 6～7

[0044] SIS block copolymers using polarity regulators preferred according to the invention: SIS block copolymerization at low polarity regulator concentrations in the high temperature range.

[0045] The first step is to prepare polystyrene hard segment (S). In a jacketed stainless steel polymerization kettle replaced with nitrogen, add 3000 mL of purified cyclohexane, heat up to 50°C with jacketed hot water, and dissolve the first part of benzene 49 mL of ethylene monomer was loaded into the reactor. The styrene feed operation was completed within 0.5 minutes. Thereafter, DMP, n-butyl lithium initiator was added to the reactor. The active initiator content and the molar ratio of polar modifier to initiator are shown in the table. The reaction temperature is 40°C to 70°C, the reaction pressure is 0.2Mp to 0.5Mp, the amount of styrene added is 50% of the total amount of styrene added, and the amount of added butyllithium initiator is determined by the designed average molecul...

Embodiment 8～10

[0053] SIS block copolymers using polarity regulators preferred according to the invention: SIS block copolymerization at high polarity regulator concentrations in the high temperature range.

[0054] (1) load cyclohexane solvent into the reactor; (2) stabilize the solvent to a certain temperature; (3) load styrene monomer and DMP; (4) load n-butyllithium; (5) the first benzene Homopolymerization of ethylene blocks where heat of polymerization increases reactor temperature gradually from styrene charge up to peak temperature; (6) 30 minute waiting time after peak temperature; (7) loading of isoprene monomer And record the reactor temperature; (8) block copolymerization of isoprene, wherein the heat of reaction raises the reactor temperature to the peak temperature, record the peak temperature and the time from the start of isoprene charging to the time when the peak temperature occurs Elapsed time; (9) waiting time; (10) loading second portion of styrene charge; (11) allowing ...

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Abstract

The invention discloses an application of 1, 2-dialkoxy propane as a polarity regulator for synthesizing a high vinyl arylethene-conjugated diene segmented copolymer, and in the process of synthesizing the arylethene-conjugated diene segmented copolymer by an anionic polymerization method, the 1, 2-dialkoxy propane is used as the polarity regulator to synthesize the high vinyl arylethene-conjugated diene segmented copolymer. The method is characterized in that the high vinyl aryl ethylene-conjugated diene block copolymer is obtained. According to the invention, the 1, 2-dialkoxy propane polarity regulator is adopted, so that the preparation of the block copolymer of conjugated diene and aryl ethylene is facilitated, the produced block copolymer is not doped with a random repetitive unit, and a conjugated diene block with high-level addition of 1, 2-vinyl and 3, 4-vinyl and single-peak narrow molecular weight distribution can be obtained.

Description

technical field [0001] The present invention relates to the application of 1,2-dialkoxypropane, in particular to the use of 1,2-dialkoxypropane as anionic polymerization to synthesize high vinyl aryl vinyl-conjugated diene block copolymers for polar adjustment The application of the agent belongs to the technical field of styrene-butadiene rubber synthesis. Background technique [0002] The process of anionic polymerization in solution of aliphatic hydrocarbons initiated by alkyllithium is block copolymerization of conjugated diene monomers (such as butadiene and isoprene) and vinyl aromatic monomers (such as styrene) to produce general technology. This is because the anionic polymerization of these types of monomers in aliphatic hydrocarbon solutions occurs by a chain reaction mechanism lacking both termination and chain transfer reactions, such polymerization mechanisms being so-called living polymerizations. The reactivity of the polymerization allows a variety of block...

Claims

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Application Information

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IPC IPC(8): C08F297/04C08F2/38
CPCC08F297/04C08F2/38Y02T10/86
Inventor 周正严绍敏王旭江国防
Owner CHINA PETROLEUM & CHEM CORP
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