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A kind of SBS containing 1,2 structure uniformly distributed butadiene block and its hydride, preparation and application method

A technology of uniform distribution and butadiene, applied in the field of SBS containing 1,2 structure uniform distribution of butadiene blocks and its hydride, preparation and application, can solve the problem of uneven distribution of butadiene and meet the needs of industrial The effect of production requirements, wide source of raw materials, and mature preparation process

Active Publication Date: 2021-09-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The existing method for synthesizing SBS cannot solve the problem of uneven distribution of 1,2-structure butadiene in the B block. The third purpose of the present invention is to provide a butadiene that realizes SBS by simply improving the synthesis conditions of the process. A Method for the Uniform Distribution of 1,2 Structures in Diene Blocks

Method used

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  • A kind of SBS containing 1,2 structure uniformly distributed butadiene block and its hydride, preparation and application method
  • A kind of SBS containing 1,2 structure uniformly distributed butadiene block and its hydride, preparation and application method
  • A kind of SBS containing 1,2 structure uniformly distributed butadiene block and its hydride, preparation and application method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Add 3500mL of cyclohexane solution with a mass fraction of 10% n-hexane to a 5-liter steel polymerization kettle under nitrogen protection, and inject 1.5g of THF and 50mL of styrene into the polymerization kettle at the same time with a syringe. After the temperature of the solvent rises to 55-65°C, inject 6.5mL of 0.5mol / L n-butyllithium into the polymerization kettle with a syringe to start the first stage of polymerization. The polymerization pressure is 0.2-0.3MPa. After 23-25min of polymerization, the When the initial temperature of the second stage is controlled at 66 ° C, 340 mL of butadiene solution mixed with 0.95 mL tetrahydrofurfuryl alcohol ethyl ether in the butadiene metering tank is uniformly pressed into the polymerization kettle within 16 minutes with nitrogen gas, and if necessary, the Add cooling water to control the temperature rise rate, that is, the temperature rise rate is controlled at (0.5-1) °C / min, and the second-stage polymerization temperatu...

Embodiment 2

[0061] With the process conditions in Example 1 unchanged, only the styrene of the first section and the third section polymerization is all set to 55mL, the n-butyllithium 4mL that the first section initiates is used, and activator selects DTHFP for use, and its consumption 0.28 mL, the second stage uses 325 mL of butadiene, 1.0 mL of DTHFP that is miscible in butadiene, the initial temperature of the second stage is controlled at 70 ° C, and the butadiene solution of ditetrahydrofurfuryl propane is used within 18 minutes with nitrogen Press evenly into the polymerization kettle.

[0062] Results: The content of 1,2-addition units in polybutadiene units in different polymerization time periods in the butadiene chain growth stage and the corresponding polymerization temperature are shown in Table 1.

[0063] Table 1 Corresponding relationship between 1,2-addition unit content and temperature in different polymerization stages of butadiene polymerization

[0064]

[0065] N...

Embodiment 3

[0069] With the process conditions in Example 1 constant, the styrene of the first section and the third section polymerization is all set as 55mL, the n-butyllithium 5mL that the first section initiates is used, and activator selects tetrahydrofurfurylamine for use, and its consumption 0.35mL, 325mL of butadiene is used in the second stage, 1.0mL of tetrahydrofurfurylamine is miscible in butadiene, the initial temperature of the second stage is controlled at 68°C, and the butadiene solution of tetrahydrofurfurylamine is filled with nitrogen in the Press evenly into the polymerization kettle within 18 minutes.

[0070] Results: See Table 2 for the content of 1,2-addition units in polybutadiene units at different polymerization time periods in the butadiene chain growth stage and the corresponding polymerization temperature in the polymerization process.

[0071] Table 2 Corresponding relationship between 1,2-addition unit content and temperature in different polymerization sta...

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Abstract

The invention discloses a SBS containing uniformly distributed butadiene blocks with a 1,2 structure and its hydride SEBS and a preparation and application method. The preparation process of the SBS is that styrene is polymerized by an initiator under the action of an activator, The second-stage polymerization process is to dissolve the 1,2 structure regulator in butadiene and evenly add it to the polymerization kettle within 16-18 minutes. After the addition is completed, it will react for another 8-12 minutes. The third-stage polymerization can be polymerized with styrene or Coupled with a coupling agent, the content of 1,2-addition units in the polybutadiene segment in the obtained SBS is 38-42% and uniformly distributed, and the SEBS obtained after hydrogenation is compatible and stable with naphthenic oil or white oil Good performance, low oil mobility in SEBS, high light transmittance, can be widely used in transparent elastic materials.

Description

technical field [0001] The present invention relates to a kind of SBS and its hydrogenated product SEBS, especially to a kind of SBS containing 1,2 structure uniformly distributed butadiene block and SEBS elastomer containing short-chain branched uniformly distributed EB block, and anionic polymerization synthesis Method for polystyrene-butadiene-styrene block polymers containing 1,2 structure uniformly distributed butadiene blocks and hydrogenated products thereof, also relates to SEBS elastomers containing short-chain branched uniformly distributed EB blocks as The application of transparent elastic materials belongs to the field of SBS or SEBS elastomers. Background technique [0002] Styrene and conjugated diene are directional polymerized into a triblock copolymer under the trigger of n-butyllithium in a cyclohexane solution. The polymer molecular chain can be linear or star-shaped. This polymer is commonly known as thermoplastic elastic A material of the body. For ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F297/04C08F8/04C08F2/38
CPCC08F2/38C08F8/04C08F297/044
Inventor 张建国吕志龙王旭佘振银蒋文英
Owner CHINA PETROLEUM & CHEM CORP
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