Star-shaped high-styrene rubber and preparation method thereof

A technology of high styrene rubber and styrene, which is applied to tire parts, transportation and packaging, special tires, etc., can solve the problems of insufficient tensile strength and hardness, low equipment utilization rate, high production cost, etc., and achieve improved hardness And dynamic mechanical properties, uniform distribution, and the effect of improving rigidity

Active Publication Date: 2018-06-01
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And mostly adopt latex coagulation technology in the prior art, although this technological process can obtain the high styrene rubber with better performance, the main problem that this method exists is: at first in technology, need to synthesize SBR-1500 or SBR-1500 respectively earlier SBR-1502 latex and high styrene resin emulsion, the two emulsions that pass the analysis are mixed in a certain proportion, and then coagulated and dried to obtain high styrene rubber. The process is relatively long and requires two water phases, oil phases, Initiator preparation and degassing and other synthesis processes; secondly, in terms of production costs, since the conversion rate of synthetic SBR-1500 or SBR-1502 latex monomers is only 70%, unreacted monomers account for 30%, and this part of monomers is in small and medium-sized It is difficult to recycle in large-scale production devices, resulting in high production costs and relatively large equipment, auxiliary materials, personnel, time, and energy required for the polymerization process; in addition, in the production cycle, since the synthesis temperature of high styrene resin emulsion is High-temperature polymerization, there are many structural gels in the polymerization kettle, and the polymerization kettle used usually needs to be cleaned once to produce 10 batches, so the utilization rate of the equipment is low
The above-mentioned polymers all have the disadvantages that the tensile strength and hardness of the product are not high enough

Method used

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  • Star-shaped high-styrene rubber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In a jacketed 15L stainless steel reactor, the system was replaced 3 times with argon gas. Add 3287g of cyclohexane, 420g of styrene (accounting for 35% of the total amount of monomers), 160g of isoprene (accounting for 13.3% of the total amount of monomers) into the polymerization kettle, add 12.1mmol of n-butyllithium, and heat up to 50°C, polymerize for 80 minutes, and then press the mixture of 4.32g THF, 2833g cyclohexane, 300g styrene (25% of the total monomer), 200g isoprene (16.7% of the total monomer) Put into the polymerization kettle to continue the reaction for 60 minutes, then press 680g of cyclohexane and 120g of butadiene (accounting for 10% of the total amount of monomers) into the polymerization kettle to continue the reaction for 40 minutes. 4 The coupling agent is used for coupling reaction, and the reaction time is 60 minutes. After the coupling reaction is completed, treat the coupled reaction mixture with water, add 100 g of water, and 12 g of anti...

Embodiment 2

[0034]In a jacketed 15L stainless steel reactor, the system was replaced 3 times with argon gas. Add 2890g of cyclohexane, 330g of styrene (accounting for 27.5% of the total amount of monomers), 180g of isoprene (accounting for 15% of the total amount of monomers) into the polymerization kettle, add 24.1mmol of n-butyllithium, and heat up to 60°C, polymerize for 50 minutes, and then press the mixture of 8.64g THF, 3230g cyclohexane, 330g styrene (accounting for 27.5% of the total amount of monomers), and 240g of isoprene (accounting for 20% of the total amount of monomers) Put into the polymerization kettle to continue the reaction for 70 minutes, then press 680g of cyclohexane and 120g of butadiene (accounting for 10% of the total amount of monomers) into the polymerization kettle to continue the reaction for 40 minutes. 6.6mmolSncl 4 (Joining Sncl for the first time 4 80% of the total amount, after 15 minutes of reaction, add the remaining 20%) coupling agent for coupling ...

Embodiment 3

[0038] In a jacketed 15L stainless steel reactor, the system was replaced 3 times with argon gas. Add 3400g of cyclohexane, 324g of styrene (accounting for 27% of the total amount of monomers), 276g of isoprene (accounting for 23% of the total amount of monomers) into the polymerization kettle, add 8.1mmol of n-butyllithium, and heat up to 60°C, polymerize for 50 minutes, and then press the mixture of 2.16g THF, 2720g cyclohexane, 216g (accounting for 18% of the total amount of monomers) styrene, and 264g (accounting for 22% of the total amount of monomers) of isoprene Put into the polymerization kettle to continue the reaction for 70 minutes, then press 680g of cyclohexane and 120g of butadiene (accounting for 10% of the total amount of monomers) into the polymerization kettle to continue the reaction for 40 minutes. 2.2mmolSncl 4 (Joining Sncl for the first time 4 80% of the total amount, after 15 minutes of reaction, add the remaining 20%) coupling agent for coupling reac...

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Abstract

The invention provides an isoprene-styrene-butadiene high-styrene rubber containing random gradual transition segments and a preparation method thereof. The structural formula is [I1→S1-I2 / S2-B3]n-Y, wherein Y is Si or Sn, n is the degree of branching, and n is greater than or equal to 2.5 and less than or equal to 4. I1→S1 is polystyrene and polyisoprene gradient copolymer; I2 / S2 is polystyrene and isoprene random segment copolymer; B3 is butadiene homopolymer; polystyrene in the structural formula The mass fraction of the gradient segment of polyisoprene and polyisoprene is 30-70wt%, the mass fraction of the random segment of polystyrene and polyisoprene is 25-60wt%, and the mass fraction of butadiene homopolymer is 5-10 %; The high styrene rubber of the present invention has the characteristics of high hardness, good strength, good elasticity, and high degree of branching. When used in combination with various synthetic rubbers or natural rubbers, it can improve the rigidity, hardness, and wear resistance of rubber products , tear resistance, dielectric properties and other properties.

Description

technical field [0001] The present invention relates to a kind of isoprene-styrene-butadiene high styrene rubber containing random gradient segment and its preparation method. The synthesized polymer is characterized by high hardness, high wear resistance, good elasticity and branching High-strength star-shaped high-styrene rubber. Background technique [0002] The copolymer composed of isoprene or butadiene and styrene, the bound styrene is generally 23-30%, if the bound styrene content is high, the plasticity of the obtained copolymer is greater; otherwise, the elasticity of the copolymer is greater . Generally, copolymers with a styrene binding amount of 45% to 70% in the molecular structure are called high-styrene rubbers, and those with a combined styrene content of more than 70% are called high-styrene resins. Due to the high amount of bound styrene in high styrene rubber, its physical properties are different from those of general-purpose styrene-butadiene rubber. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F297/04C08F2/38C08F8/42B60C1/00
Inventor 史工昌董静王锋杨绮波康安福宋同江龚光碧梁滔郑聚成李晶翟云芳钟启林丛日新张元寿陈建刚
Owner PETROCHINA CO LTD
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