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Asymmetric star-shaped hydrogenated block copolymer and preparation method and application thereof

A hydrogenated styrene-butadiene block and asymmetric technology, which is applied in the field of polymers, can solve the problems of large compression set, large decline in mechanical properties, and failure to meet sealing strips, etc., and achieve long service life, excellent UV resistance, and improved The effect of heat resistance

Pending Publication Date: 2020-11-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] After the traditional block copolymer SEBS is processed into a sealing strip, its mechanical properties drop more, and the compression permanent deformation is larger, which cannot meet the requirements of the sealing strip.

Method used

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  • Asymmetric star-shaped hydrogenated block copolymer and preparation method and application thereof
  • Asymmetric star-shaped hydrogenated block copolymer and preparation method and application thereof
  • Asymmetric star-shaped hydrogenated block copolymer and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] Add 2.5 liters of cyclohexane and raffinate oil mixture (the mixing ratio of cyclohexane and raffinate oil is 9:1) into the 5 liter polymerization kettle purged with nitrogen, which contains 500 mg / kg of solvent of tetrahydrofuran. The temperature of the mixture was raised to 50° C., 67 g of styrene, 0.20 g of pentamethyldiethylenetriamine, and then 3.57 mmol of n-butyllithium were added to initiate the reaction. After stirring and reacting for 20-30 minutes, add 150g of butadiene into the active polymer, control the reaction temperature at 65-75°C, stir and react for 20-40min, then add a mixture of 33g of styrene and 1.25g of divinylbenzene Put the monomer into the active polymer, stir and react for 20 to 30 minutes, then add 0.9 mmol of coupling agent silicon tetrachloride, and stir and react for 10 to 30 minutes. After the polymerization, press the polymer into a 5-liter hydrogenation tank, control the temperature at 50-100 °C, add 68 mmg of methyl benzoate to the hy...

Embodiment 2

[0084] Implementation steps are the same as in Example 1, changing the addition of each material and controlling the reaction temperature. Wherein the solvent is in the same amount as tetrahydrofuran. In the first stage, 60 g of styrene and 0.25 g of tetramethylethylenediamine were added, and then 3.57 mmol of n-butyllithium was added to initiate the reaction. Add 175g of butadiene in the second stage, during which the reaction temperature is controlled at 50-65°C, add a mixture of 15g of styrene and 1.5g of divinylbenzene into the active polymer in the third stage, and then add 0.9mmol of the coupling agent silicon tetrachloride Perform coupling. After the polymerization, carry out the hydrogenation reaction for 60-120 minutes, and add 5ml of water to terminate the reaction. 0.6% antioxidant based on the weight of the polymer was added to the reaction mixture. The solid is separated, and the drying oven is devolatilized to obtain an asymmetric star-shaped hydrogenated bloc...

Embodiment 3

[0086] Step is all identical with embodiment 1 except conditioner and material addition. The regulator is 0.48 g of tetrahydrofurfuryl alcohol ethyl ether, the coupling agent is divinylbenzene, and the amount of coupling agent added is 1.4 g. Meanwhile, the reaction temperature is controlled at 40-55°C, the reaction is stirred for 40-60 minutes, and then an asymmetric star-shaped hydrogenated block copolymer (S 1 EBS 2 )nDVB. The molecular weight of the copolymer is 347388 (Mn), the coupling degree is 6.15, the coupling efficiency is 83.57%, and the 1,2-structure content of the PB segment is 70.5%. NMR spectrum see figure 2 .

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Abstract

The invention discloses an asymmetric star-shaped hydrogenated block copolymer and a preparation method and application thereof. The structural formula of the asymmetric star-shaped hydrogenated blockcopolymer is (S1EBS2) nM, wherein S1 represents a polymer chain segment of a styrene monomer; S2 represents a polymer chain segment of copolymerization of styrene and a divinylbenzene monomer; the molecular weight of the polymer chain segment S1 is greater than that of the polymer chain segment S2; and the polymer is mainly prepared by polymerizing and coupling to obtain (S1EBS2) nM and then hydrogenating. The technical problem of low coupling efficiency of styrene at the tail end of a polymer arm is solved, and a sealing material with low compression deformation, high resilience and long service life is prepared and is widely applied to the field of sealing parts.

Description

technical field [0001] The invention relates to an asymmetric hydrogenated star-shaped polystyrene-polyconjugated diene-b-polystyrene block copolymer suitable for excellent weather resistance, low compression deformation and high resilience, and its preparation method and application, belonging to polymer field. Background technique [0002] The main functions of seals are shock absorption, noise reduction, heat insulation, sealing, dustproof and waterproof, so they must have good corrosion resistance, weather resistance, chemical resistance, low compression deformation and high resilience. Commonly used sealing strip materials are modified PVC, neoprene (CR), nitrile rubber (NBR), polyurethane elastomer (PU), thermoplastic vulcanizate (TPV), ethylene-propylene rubber and thermoplastic elastomer rubber, and silicone rubber. sealing strip. [0003] PVC sealing strips, neoprene, and nitrile rubber have poor ozone resistance and weather resistance; polyurethane elastomers hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F297/04C08F8/04C08L53/02
CPCC08F297/04C08F8/04C08L53/025
Inventor 彭小寒袁煜艳
Owner CHINA PETROLEUM & CHEM CORP
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