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Epoxy-terminated polysulfide rubber modified SBS, preparation method thereof, and application of modified SBS in modified asphalt

A technology of polysulfide rubber and epoxy-terminated technology, which is applied in the field of modified SBS rubber, can solve the problems that it has not been reported and cannot be used as an anionic polymerization active lithium coupling agent.

Active Publication Date: 2019-12-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Liquid polysulfide rubber is cured and formed according to the condensation of mercaptan at the end of the molecular chain with metal oxides or ring-opening crosslinking with epoxy-based oligomers, but liquid polysulfide rubber cannot be used as a coupling agent for anionic polymerization of active lithium
Up to now, the literature on epoxidized polysulfide rubber used as the mid-end modification technology of the anionic polymer SBS molecular chain has not been reported.

Method used

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  • Epoxy-terminated polysulfide rubber modified SBS, preparation method thereof, and application of modified SBS in modified asphalt
  • Epoxy-terminated polysulfide rubber modified SBS, preparation method thereof, and application of modified SBS in modified asphalt
  • Epoxy-terminated polysulfide rubber modified SBS, preparation method thereof, and application of modified SBS in modified asphalt

Examples

Experimental program
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Effect test

Embodiment 1

[0088] Add 3500mL of cyclohexane solution of 10% n-hexane in mass fraction to a 5-liter polymerization kettle under the protection of nitrogen, then add 0.2mL tetrahydrofuran, and heat the solvent in the polymerization kettle to 50-60°C with hot water , put 100g of styrene into the polymerization kettle and start stirring, then inject 1.0mol / L n-butyllithium 12mL into the polymerization kettle with a syringe, and react for 20~25min; then add 338 butadiene at 50~90℃ After reacting for 25min; adding the toluene solution mass concentration that is prepared from preparation example (1) again is 50% end epoxy polysulfide rubber solution 10.6g, at 55 ～ After the coupling reaction was carried out at 70°C for 30 minutes. Discharge the polymer, and add 1.25g of antioxidant 1076 into the glue, stir the glue, then add the glue into boiling water and stir for 40 minutes, after the solvent is fully evaporated, filter out the water, and put it at 80°C Bake at low temperature for 2h. That ...

Embodiment 2

[0091] With the relevant process conditions in Example 1 unchanged, only changing the amount of n-butyllithium is 14mL, the amount of butadiene is 580mL, and the mass concentration of the toluene solution prepared in the preparation example (2) is 50%. Epoxy polysulfide rubber solution 34.3g.

[0092] The SBS Mn after coupling was measured to be 8.24×10 4 ,M W =13.34×10 4 ; Melt index 7.9g / 10min; 300% modulus stress of 2.16MPa, elongation at break of 1030% and permanent deformation of 12% were measured after the rubber was pressed into tablets.

Embodiment 3

[0094] With the relevant process conditions in Example 1 unchanged, only changing the amount of n-butyllithium to 10mL, the amount of butadiene to 435mL, and the mass concentration of the toluene solution prepared in Preparation Example (3) to be 50% end Epoxy polysulfide rubber solution 37.5g.

[0095] The SBS Mn after coupling was measured to be 11.73×10 4 ,M W =18.84×10 4 ; Melt index 3.67g / 10min; 300% modulus stress of 2.46MPa, elongation at break of 860% and permanent deformation of 16% were measured after the rubber was pressed into tablets.

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Abstract

The invention discloses an epoxy-terminated polysulfide rubber modified SBS, a preparation method thereof, and an application of the modified SBS in modified asphalt. The preparation method of the modified SBS comprises the following steps: performing anionic polymerization to obtain a styrene-butadiene block copolymer sol containing active terminal lithium, and coupling the styrene-butadiene block copolymer sol with an epoxy-terminated polysulfide rubber to obtain the epoxy-terminated polysulfide rubber modified styrene-butadiene block copolymer. The polymer retains the original mechanical properties of the styrene-butadiene block polymer, makes the polysulfide rubber have low-temperature flexibility, weather resistance and aging resistance, and improves the polarity of the butadiene-styrene block polymer, so the modified SBS has an improved plasticizing effect and enhanced affinity, and can obviously reduce the segregation phenomenon of the butadiene-styrene block polymer and asphaltwhen used for asphalt modification.

Description

technical field [0001] The present invention relates to a kind of modified SBS rubber material, particularly a kind of epoxy-terminated polysulfide rubber is used as the coupling agent of anionic polymer SBS to prepare the method for epoxy-terminated polysulfide rubber modified styrene-butadiene block copolymer, It also relates to the use of epoxy-terminated polysulfide rubber modified styrene-butadiene block copolymer as a modified asphalt additive, which belongs to the technical field of modified SBS rubber. Background technique [0002] The traditional styrene-butadiene block polymer (SBS) has a linear and star structure, and the linear structure includes SBS (YH-791H) produced by the Synthetic Rubber Division of Baling Petrochemical Company of China Petroleum and Chemical Corporation; Coupling agents used for star-shaped polymers include silicon tetrachloride, alkoxysilane, etc. as coupling agents for active lithium polymers, such as models such as SBS (YH-815). This ty...

Claims

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Application Information

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IPC IPC(8): C08G81/02C08L95/00C08L87/00C08K3/34C08K3/26
CPCC08G81/024C08L95/00C08K2003/265C08L87/005C08K3/34C08K3/26Y02A30/30
Inventor 张建国邢立江刘篪梁智英蒋文英
Owner CHINA PETROLEUM & CHEM CORP
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