阅读说明：本技术 一种深色高强力苯乙烯-丁二烯橡胶的制造方法 (Method for preparing deep-color high-strength styrene-butadiene rubber ) 是由 王健 李伟 王志 于 2020-05-22 设计创作，主要内容包括：本发明公开了一种深色高强力苯乙烯-丁二烯橡胶的制造方法,该法采用低温乳液聚合,将丁二烯、苯乙烯、脱盐水、除氧剂、调节剂、乳化剂和引发剂等经静态混合器在线混合,通过控制苯乙烯-丁二烯橡胶聚合物中结合苯乙烯含量等手段,经过聚合、单体回收、掺合、凝聚、干燥等步骤制备聚合物,进而实现产品具有较高的定伸应力。同时采用脂肪酸皂和松香酸皂的混合皂为乳化剂,有效解决产品了在制造过程存在的严重粘连设备和产品在加工时存在的易粘辊的缺陷,有效提高了橡胶的生产和加工效率。(The invention discloses a method for preparing dark-color high-strength styrene-butadiene rubber, which adopts low-temperature emulsion polymerization, and comprises the steps of mixing butadiene, styrene, desalted water, an oxygen scavenger, a regulator, an emulsifier, an initiator and the like on line through a static mixer, controlling the content of the combined styrene in a styrene-butadiene rubber polymer, and the like, and preparing the polymer through the steps of polymerization, monomer recovery, blending, coagulation, drying and the like, so that the product has higher stress at definite elongation. Meanwhile, the mixed soap of fatty acid soap and rosin acid soap is used as an emulsifier, so that the defects of serious adhesion equipment in the manufacturing process and easy adhesion of a roller during processing of the product are effectively overcome, and the production and processing efficiency of rubber is effectively improved.)

1. A method for producing a deep-colored high-strength styrene-butadiene rubber, comprising: butadiene, styrene, desalted water, an oxygen scavenger, a regulator, an emulsifier and an initiator are mixed on line by a static mixer by adopting a low-temperature emulsion polymerization method, and then are coagulated and dried to obtain the polymer.

2. The process of claim 1, wherein the oxygen scavenger is sodium dithionite, the modifier is t-dodecyl mercaptan, and the initiator is t-butyl hydroperoxide, benzoyl peroxide, cumene hydroperoxide, or Azobisisobutyronitrile (AIBN).

3. The process for producing a dark-colored high-strength styrene-butadiene rubber according to claim 1, wherein the emulsifier is a mixture of a fatty acid soap and rosin acid.

4. The method for producing a deep color high strength styrene-butadiene rubber according to claim 1, wherein the weight ratio of butadiene to styrene is 100 to 70: 50 to 30, and the monomer concentration is 10 to 60g of total monomer/100 mg of solvent.

5. The method for preparing the dark-colored high-strength styrene-butadiene rubber according to claim 1, wherein the polymerization temperature is controlled to be 5-8 ℃, the reaction time is controlled to be 8-12 hours, and the reaction pressure is controlled to be 0.2-0.5 MPa.

6. The process for producing a dark-colored high-tenacity styrene-butadiene rubber according to claim 1, wherein the styrene-butadiene rubber polymer has a total styrene content of 29.0 ± 1.0% by weight and a mooney viscosity (ML (1 + 4)/100 ℃) of 60 ± 5.

7. The method for producing a deep color high strength styrene-butadiene rubber according to claim 1, wherein a terminating agent is added to the latex after the polymerization conversion rate reaches 65 to 70%, and the terminating agent may be sodium dimethyldithiocarbamate or diethylhydroxylamine.

Technical Field

The invention relates to the technical field of rubber manufacturing, in particular to a method for manufacturing dark-colored high-strength styrene-butadiene rubber.

Background

Styrene Butadiene Rubber (SBR), produced by the copolymerization of butadiene and styrene. The production method is divided into emulsion polymerization and solution polymerization, and the comprehensive performance and the chemical stability of the polymer are better. In the prior art, in the manufacturing and production process of SBR1566, because the emulsifier is made of all-loose soap, the product is stuck on a roller, the processing is not facilitated, and the defects of low stress at definite elongation and low practicability exist, the improvement is made, and the manufacturing method of the dark-color high-strength styrene-butadiene rubber is provided.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provides a method for preparing a dark-colored high-strength styrene-butadiene rubber.

In order to achieve the purpose, the invention adopts the following technical scheme:

a process for producing a dark colored high tenacity styrene-butadiene rubber, the process comprising: butadiene, styrene, desalted water, an oxygen scavenger, a regulator, an emulsifier and an initiator are mixed on line by a static mixer by adopting a low-temperature emulsion polymerization method, and then are coagulated and dried to obtain the polymer.

As a preferable technical scheme of the invention, the oxygen scavenger is sodium hydrosulfite, the regulator is tert-dodecyl mercaptan, and the initiator can be tert-butyl hydroperoxide, benzoyl peroxide, cumene hydroperoxide and Azobisisobutyronitrile (AIBN).

As a preferable technical scheme of the invention, the emulsifier is prepared by adopting a mixture of fatty acid soap and abietic acid.

As a preferred technical scheme of the invention, the weight ratio of butadiene to styrene is 100-70: 50-30, and the monomer concentration is 10-60 g of total monomer/100 mg of solvent.

As a preferred technical scheme of the invention, the polymerization reaction temperature is controlled to be 5-8 ℃, the reaction time is controlled to be 8-12 hours, and the reaction pressure is controlled to be 0.2-0.5 MPa.

As a preferred embodiment of the present invention, the styrene-butadiene rubber polymer has a total styrene content of 29.0. + -. 1.0% by weight and a Mooney viscosity (ML (1 + 4)/100 ℃ C.) of 60. + -.5.

As a preferred technical scheme of the invention, a terminating agent is added into the latex after the conversion rate of the polymerization reaction reaches 65-70%, and the terminating agent can be sodium dimethyldithiocarbamate and diethylhydroxylamine.

The invention has the beneficial effects that: the manufacturing method of the dark-color high-strength styrene-butadiene rubber has the following advantages: 1. the mixed emulsifier of the fatty acid soap and the rosin acid is used, so that roll sticking is avoided, and processing is facilitated; 2. the stress at definite elongation of the product is high at 35min and 145 ℃, and reaches (17.5 +/-2.0) MPa; 3. due to the use of the high-efficiency antioxidant, the content of the antioxidant is reduced, and the content of the organic acid is reduced, so that the content of the softener in the rubber is greatly reduced, and the tensile strength of the rubber is improved; 4. the content of the softener is greatly reduced, so that the tearing and cracking performance of the rubber product can be improved; 5. the quantity of double bonds is reduced due to the rising of the content of the styrene, and the heat aging performance of the rubber is improved; 6. the anti-slippery performance of the product is improved due to the increased content of benzene ring.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.