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Preparation method of solution polymerized styrene-butadiene rubber

A technology of solution-polymerizing styrene-butadiene rubber and solvent is applied in the rubber field, which can solve the problems of life and property threats, environmental pollution, and smoke generation, and achieve excellent mechanical properties, increase the scope of application, and reduce energy consumption.

Pending Publication Date: 2021-11-26
山东京博中聚新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, styrene-butadiene rubber is extremely flammable and will produce thick smoke and molten droplets when burned. Once ignited, it may cause serious fire accidents and pose a serious threat to human life and property. performance matters
[0003] Flame-retardant styrene-butadiene rubber generally has two methods to obtain, one method is to add flame retardant to styrene-butadiene rubber for mixing and processing to obtain styrene-butadiene rubber products with flame-retardant effect, such as publication number CN104610608A and publication number The Chinese patent of CN104610608A is to add a halogen-containing flame retardant to styrene-butadiene rubber to obtain a rubber compound with a better flame-retardant effect, but when it exerts a flame-retardant effect, it will release a large amount of smoke, toxic substances and corrosion. These substances will pollute the environment and cause harm to human health; the Chinese patent with the publication number CN107118412A uses halogen-free hydroxymethyl lignin, transition metal silicate and magnesium hydroxide composite flame retardant The flame-retardant styrene-butadiene rubber composition prepared from the styrene-butadiene rubber composition has good flame-retardant properties and mechanical properties, but magnesium hydroxide is an inorganic substance and has poor compatibility with styrene-butadiene rubber, resulting in difficulty in processing and molding
Another kind of method is that brominated agent reacts with styrene-butadiene rubber rubber, introduces bromine functional group and reaches the purpose of improving flame retardancy, prior art generally redissolves styrene-butadiene rubber, and solvent is halogenated hydrocarbon (publication number is CN103059367A Chinese patent), but it does not involve the direct bromination of styrene-butadiene rubber in the synthesis process, and does not regulate the product structure. If the bromine content is greater than 60%, almost all butadiene double bonds will react, which will reduce the original performance of styrene-butadiene rubber. The product is only Suitable for flame retardant

Method used

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  • Preparation method of solution polymerized styrene-butadiene rubber
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  • Preparation method of solution polymerized styrene-butadiene rubber

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preparation example Construction

[0023] The invention provides a method for preparing solution-polymerized styrene-butadiene rubber, comprising: S1) in a protective atmosphere, mixing styrene, butadiene, a solvent and organic lithium to carry out a polymerization reaction to obtain a glue solution; S2) mixing the The glue is mixed with the brominating agent to carry out the bromination reaction, the acid-binding agent is added for neutralization, washed with water, and the organic phase is obtained by standing for stratification; S3) the organic phase, the antioxidant and the stabilizer are mixed, and the solvent is removed to obtain the solution polymerization SBR.

[0024] Among them, the present invention has no special limitation on the sources of all raw materials, which can be commercially available.

[0025] In a protective atmosphere, styrene, butadiene, solvents, and organic lithium are mixed for polymerization to obtain a glue; the protective atmosphere is a protective atmosphere well known to those...

Embodiment 1

[0040] In this example, Br 2 is the brominating agent, Br 2 The mol ratio with butadiene is 0.3:1, and concrete implementation steps are as follows:

[0041] 1.1 Prepare styrene-butadiene random copolymers by living anionic polymerization technology: seal a 500ml polymerization bottle under the protection of high-purity nitrogen, vacuum bake and pump three times, add 195g cyclohexane solvent, 14.5g styrene, 21.75g Butadiene, start stirring, after the temperature rises to 55°C, add 0.14mL n-butyllithium solution (concentration: 1.6mol / L), react for 60min, add 0.34g triethylene glycol, stop for 5min, and obtain glue.

[0042] 1.2 Take 6.1ml Br 2 Add to the glue solution obtained in step 1.1 and stir vigorously, the bromination reaction temperature is 45°C, and the bromination reaction time is 60min.

[0043] 1.3 Add 1wt% NaOH solution to step 1.2, and react for 5 minutes to make the pH of the liquid system ≥ 7.

[0044] 1.4 Wash the system obtained in step 1.3 with deionized...

Embodiment 2

[0050] In this example, Br 2 is the brominating agent, Br 2 The mol ratio with butadiene is 0.35:1, and the specific implementation steps are as follows:

[0051] 2.1 Prepare styrene-butadiene random copolymers by living anion polymerization technology: seal a 500ml polymerization bottle under the protection of high-purity nitrogen, bake and pump three times under vacuum, add 195g cyclohexane solvent, 14.5g styrene, 21.75g Butadiene, start stirring, after the temperature rises to 55°C, add 0.14mL n-butyllithium solution (concentration: 1.6mol / L), react for 60min, add 0.34g triethylene glycol, stop for 5min, and obtain glue.

[0052] 2.2 Take 7.1ml of Br 2 Add to the glue solution obtained in step 2.1 and stir vigorously, the bromination reaction temperature is 45°C, and the bromination reaction time is 60min.

[0053] 2.3 Add 1wt% NaOH solution to step 2.2, and react for 5 minutes to make the pH of the liquid system ≥ 7.

[0054] 2.4 Wash the system obtained in step 2.3 wi...

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Abstract

The invention provides a preparation method of solution polymerized styrene-butadiene rubber, which comprises: S1) in a protective atmosphere, mixing styrene, butadiene, a solvent and organic lithium, and carrying out a polymerization reaction to obtain a rubber solution; s2) mixing the rubber solution with a brominating agent for bromination reaction, adding an acid-binding agent for neutralization, washing with water, and standing for layering to obtain an organic phase; and S3) mixing the organic phase, the antioxidant and the stabilizer, and removing the solvent to obtain the solution polymerized styrene-butadiene rubber. Compared with the prior art, the brominated solution-polymerized styrene-butadiene rubber with flame retardant property is directly synthesized by adding the brominating agent while the solution-polymerized styrene-butadiene rubber is prepared by adopting an active anionic polymerization technology, and a styrene-butadiene rubber solvent does not need to be removed before bromination for redissolution, so that the aims of simplifying a solution-polymerized styrene-butadiene rubber process and reducing energy consumption are fulfilled; and the obtained solution polymerized styrene-butadiene rubber has excellent mechanical properties, so that the application range of the solution polymerized styrene-butadiene rubber product is widened.

Description

technical field [0001] The invention belongs to the technical field of rubber, in particular to a preparation method of solution-polymerized styrene-butadiene rubber. Background technique [0002] Styrene-butadiene rubber is a styrene-butadiene copolymer synthesized from styrene and butadiene. Its processing performance and product performance are relatively close to those of natural rubber, and it is heat-resistant and wear-resistant, vulcanization speed and durable. It is better than natural rubber in terms of aging and other aspects, and can be used together with natural rubber and various other rubbers. Therefore, styrene-butadiene rubber is widely used in various production fields such as rubber hoses, tires, wires and cables, and medical appliances. It is the earliest rubber product manufactured by industrialization, and it is also the largest synthetic rubber variety. However, styrene-butadiene rubber is extremely flammable and will produce thick smoke and molten dro...

Claims

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Application Information

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IPC IPC(8): C08F236/10C08F212/08C08F8/22
CPCC08F8/22C08F236/10C08F212/08
Inventor 谢晴李立霞韩飞荆帅林栾波任学斌王耀伟
Owner 山东京博中聚新材料有限公司