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A kind of antioxidant addition method for thermal oxygen stabilization of lithium series styrene thermoplastic elastomer

A thermoplastic elastomer and thermoplastic elastic technology, applied in the chemical field, can solve the problems that the product cannot change color and maintain stability due to aging, is uneconomical, and the anti-oxidation performance cannot meet the requirements, so as to achieve color change and aging, maintain stability, and overcome product Effect of coloring, good resistance to thermo-oxidative aging effect

Active Publication Date: 2018-04-24
RIANLON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, based on the above description, hindered phenol propionate antioxidants will cause coloring of the product due to strong alkalinity, and the obtained product cannot maintain stability against discoloration and aging
However, the simple hindered phenolic antioxidants used, such as antioxidant BHT, have an active catalyst termination effect to a certain extent, and the antioxidant BHT will be released during the stripping process, and will be volatilized due to the higher temperature in the production process of SBS and SIS Spill, causing pollution, at the same time, its anti-oxidation performance cannot meet the requirements at high temperature, and the use of antioxidant BHT is restricted worldwide; and the use of antioxidant 565 and antioxidant 330 leads to a substantial increase in cost, which is uneconomical of

Method used

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  • A kind of antioxidant addition method for thermal oxygen stabilization of lithium series styrene thermoplastic elastomer
  • A kind of antioxidant addition method for thermal oxygen stabilization of lithium series styrene thermoplastic elastomer
  • A kind of antioxidant addition method for thermal oxygen stabilization of lithium series styrene thermoplastic elastomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The preparation method of SBS comprises the following steps:

[0051] (1) prepare SBS polymerization reaction liquid according to prior art, namely in 2L high pressure reactor, fully replace with high-purity nitrogen, then add 900g purified cyclohexane, 0.2ml tetrahydrofuran and 40g styrene to it, Keep at 50-52°C. A solution of n-butyllithium (BuLi) 2 mmol in cyclohexane (1.3 M) was added to the reactor as an initiator to initiate polymerization. After the polymerization temperature reached the maximum value for 10-12 min, 120 g of butadiene was added. Then, after the polymerization temperature with butadiene reached a maximum value of 7-10 min, a further 40 g of styrene was added. After the styrene polymerization temperature reaches the maximum value for 5-7 minutes, the polymerization reaction liquid-1 is obtained.

[0052] (2) A cyclohexane solution of antioxidant 626 (0.6 g) was added to the reactor, and the solution was stirred at 50-55° C. for 7-10 min to obtai...

Embodiment 2-12

[0056] The operations of Examples 2-12 are the same as those of Example 1, and the difference is only in that the types and amounts of antioxidants of the present invention added in step (2) and step (3) are different, which are specifically listed in Table 3.

[0057] Table 3: Antioxidant species and addition amounts used in Examples 2-12

[0058]

[0059]

Embodiment 13

[0061] The preparation method of SIS includes the following steps:

[0062] (1) prepare SIS polymerization reaction liquid according to prior art, namely in 2L high pressure reactor, fully replace with high-purity nitrogen, then add 1050g purified cyclohexane, 0.034mol tetrahydrofuran and 17.5g styrene into it, and The temperature was kept at 30-35°C. Add n-butyllithium (BuLi) 0.014mmol cyclohexane solution (1.3M) to the reactor as an initiator, and heat up to 45-47°C to initiate polymerization. After the polymerization temperature reaches 50-80°C and after 30-35min , add 135g of isoprene. Then, the reaction is carried out at a polymerization temperature of 100-102° C. for 45-50 min. 17.5 g of styrene was further added, and after the styrene polymerization temperature reached 80-85° C. for 25-27 minutes, a polymerization reaction solution-1 was obtained.

[0063] (2) A cyclohexane solution of antioxidant 626 (0.51 g) was added to the reactor, and the solution was stirred at...

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PUM

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Abstract

The invention relates to an antioxidant addition method for thermal oxidative stabilization of a lithium styrene thermoplastic elastomer. The antioxidant addition method comprises the following steps: adding one or two kinds of diphosphorous acid diaryl pentaerythritol ester antioxidants and / or one kind of phosphorous acid (diaryl monoalkyl) ester antioxidant into polymer reaction liquid, stirring at polymerization reaction temperature for 7-10min, then adding one kind of hindered phenol antioxidant or a compound of one kind of hindered phenol antioxidant and one kind of phosphite ester antioxidant into the reaction liquid, and stirring at polymerization reaction temperature for 7-10min to dissolve the antioxidants in the reaction liquid. The diphosphorous acid diaryl pentaerythritol ester and / or phosphorous acid (diaryl mono alkyl) ester antioxidants play double roles of chain termination and guarantee of the functions of the antioxidants, and simultaneously solve the problem of product coloration caused by strong basicity of the hindered phenol propionate antioxidant, thereby realizing maintenance of stability on discoloration and thermal oxidative aging.

Description

technical field [0001] The invention belongs to the technical field of chemistry, and in particular relates to an antioxidant addition method for thermo-oxidative stabilization of lithium-based styrene-based thermoplastic elastomers. Background technique [0002] Thermoplastic elastomer TPE is a new type of polymer developed in the 1960s, and it is a major breakthrough in the theory and application of polymer material science and engineering. It has the characteristics of rubber and thermoplastics. It shows the high elasticity of rubber at room temperature and is a polymer material that can be plasticized at high temperature. It is called "the third generation rubber" after natural rubber and synthetic rubber. [0003] Among them, styrene-based thermoplastic elastomers, also known as styrene block copolymers, mainly include styrene-butadiene block copolymer SBS, styrene-isoprene block copolymer SIS and its hydrogenated product SEBS, Thermoplastic elastomers such as SEPS ar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F2/42C08F297/04C08L53/02C08K5/527C08K5/134C08K5/526C08K5/13C08K5/3492C08K5/378C08K5/375
CPCC08F2/42C08F297/04C08F297/046C08K5/13C08K5/1345C08K5/3492C08K5/34924C08K5/3725C08K5/378C08K5/526C08K5/527C08K2201/014C08L2201/08C08L53/02
Inventor 汤翠祥安平丁照宇
Owner RIANLON