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Polybutadiene rubber and preparation method thereof

A technology for polybutadiene rubber and butadiene, which is applied in the field of polybutadiene rubber and its preparation, can solve the problems of high quality requirements, complicated process control, inability to prepare basic molecular weight polymers, etc. The effect of control and wide molecular weight distribution

Active Publication Date: 2014-10-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The staged feeding process has high requirements on the quality of raw materials, and the process control is relatively complicated. In the case of the same material residence time in a single tank and the same number of polymerization tanks, it is limited by the conversion rate of the monomer. feedstock, the staged feed process cannot produce polymers with higher molecular weights
And the invention does not use a gel inhibitor, it is difficult to ensure the long-term operation of the device

Method used

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  • Polybutadiene rubber and preparation method thereof

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preparation example Construction

[0024] The preparation method of the polybutadiene rubber in the present invention also includes removing the organic solvent after contacting the copolymer solution with the terminator. The methods for removing the organic solvent are well known to those skilled in the art, and will not be repeated here. In order to obtain polybutadiene rubber with more excellent aging resistance, preferably, the preparation method of the polybutadiene rubber also includes contacting the copolymer solution with a terminator and before removing the organic solvent, The chemical solution is in contact with the anti-aging agent. The amount of the anti-aging agent can generally be 0.1-2% by weight of the content of the polybutadiene rubber. The anti-aging agent can be various existing anti-aging agents that can be used as polybutadiene rubber additives, for example, the anti-aging agent can be phenolic and / or amine anti-aging agents, preferably selected from 2,6-ditertiary One of butyl p-cresol...

Embodiment 1

[0039] This embodiment is used to illustrate the preparation method of the polybutadiene rubber provided by the present invention.

[0040] The reaction was carried out in two 5-liter polymerization reactors connected in series. Under the protective atmosphere of high-purity nitrogen, the residence time of the materials in the single tank is 30 minutes, and the pressure in the polymerization tank is controlled at 0.7 MPa (gauge pressure). The feed rate of various reaction materials is: mixed solvent (cyclohexane and n-hexane, weight ratio 88:12) 6199g / h, 1,3-butadiene 1361g / h, n-butyllithium 1.09g / h and 1,2-butadiene 0.68g / h. Control the polymerization reaction temperature of the first kettle to 100±2°C, and the polymerization reaction temperature of the second kettle to 125±2℃, add a terminator isopropanol 1.02g / h to the outlet of the second kettle to terminate the reaction, and add 0.2% of monomer weight to prevent aging Agent Irganox1520 to obtain polybutadiene rubber glu...

Embodiment 2

[0042] This example is used to illustrate the preparation method of polybutadiene rubber provided by the present invention.

[0043] Using the same experimental conditions as in Example 1, the only difference is that the amount of 1,2-butadiene added is 0.41 g / h. The monomer conversion and the molecular parameters and gel content of polybutadiene rubber are shown in Table 1.

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Abstract

The invention discloses polybutadiene rubber and a preparation method thereof. The polybutadiene rubber comprises 5-15wt% of a structural unit obtained by 1,2-polymerization of 1,3-butadiene and 85-95wt% of a structural unit obtained by 1,4-polymerization of 1,3-butadiene. The polybutadiene rubber has cis-1,4-structural unit content of 30-45wt%, a number-average molecular weight of 40000-500000 and molecular weight distribution of 2.0-3.0. The polybutadiene rubber obtained by the preparation method has wide molecular weight distribution, guarantees complete monomer conversion in reasonable staying time and has gelling controllability in the reaction.

Description

technical field [0001] The invention relates to a polybutadiene rubber and a preparation method thereof. Background technique [0002] Polybutadiene rubber (LCBR) prepared by lithium-based polymerization technology is not only the first choice for impact modification of PS and ABS resins, but also an ideal rubber for tires or rubber shoes. Due to its excellent processing performance, high filling performance, wear resistance, dimensional stability, low hysteresis loss, and low permanent deformation, in tire production, LCBR is used as tread rubber in combination with other rubber types, and is used in radial tires. Zikou glue and apex glue are also widely used. [0003] As rubber for tires, LCBR needs to be blended with reinforcing fillers such as silica and carbon black, as well as vulcanizing agents, accelerators and other additives. The speed and efficiency with which these additives are absorbed and subsequently dispersed in the rubber matrix, that is, the processing of...

Claims

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Application Information

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IPC IPC(8): C08F136/06C08F2/06
Inventor 吕万树李传清徐林邰峰解希铭胡保利王丽丽鲁文平
Owner CHINA PETROLEUM & CHEM CORP
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