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A kind of chain transfer agent and its preparation method and application

A chain transfer agent and reaction technology, applied in the field of chain transfer agents, can solve the problems of on-site operators' health effects, central nervous system anesthesia, irritation of respiratory mucosa, etc., to extend the cleaning and maintenance cycle, improve mechanical properties, The effect of reducing production costs

Active Publication Date: 2016-02-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, mercaptan compounds have a special stench, are irritating to the skin and mucous membranes of the respiratory tract, and have an anesthetic effect on the central nervous system. environmental protection

Method used

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  • A kind of chain transfer agent and its preparation method and application
  • A kind of chain transfer agent and its preparation method and application
  • A kind of chain transfer agent and its preparation method and application

Examples

Experimental program
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preparation example Construction

[0024] The preparation method of the chain transfer agent provided by the present invention comprises that in the presence of an initiator and under the conditions of olefin polymerization reaction, the olefin monomer having the structure shown in formula (II) and the conjugated diene are polymerized in a solvent, so that A random copolymer with a number average molecular weight not greater than 20000, preferably 1000-20000, more preferably 2000-12000, more preferably 4000-8000;

[0025]

[0026] Among them, R 1 -R 3 same or different, each independently H or C 1 -C 5 of alkyl.

[0027] The C 1 -C 5 The alkyl group can be reasonably selected according to the above, and will not be repeated here.

[0028] Specifically, the olefin monomer having the structure shown in formula (II) can be selected from 2,4-diphenyl-4-methyl-1-pentene, 2,4-diphenyl-4-methyl-1 -hexene, 2,4-diphenyl-4-methyl-1-heptene, 2,4-diphenyl-4-methyl-1-octene and 2,4-diphenyl-4- A kind of methyl-1-...

preparation example 1

[0041] This preparation example is used to illustrate the chain transfer agent provided by the present invention and its preparation method.

[0042] 140g of 2,4-diphenyl-4-methyl-1-pentene (ie R 1 -R 3 Both are methyl), 140g isoprene and 2000g cyclohexane were added into a 5L polymerization kettle and mixed evenly, then the temperature of the mixture was raised to 50°C, the pressure was controlled at 0.3MPa, and 32.2mL n-butyl lithium ( BuLi) was polymerized for 60 minutes to obtain chain transfer agent a with a number average molecular weight of 4000.

preparation example 2

[0044] This preparation example is used to illustrate the chain transfer agent provided by the present invention and its preparation method.

[0045] 180g of 2,4-diphenyl-4-methyl-1-pentene (ie R 1 -R 3 Both are methyl), 720g cyclopentadiene and 2000g cyclohexane were added to a 5L polymerization kettle and mixed evenly, then the temperature of the mixture was raised to 80°C, the pressure was controlled at 0.5MPa, and 16.2mL n-butyl lithium ( BuLi) was polymerized for 30 minutes to obtain chain transfer agent b with a number average molecular weight of 8000.

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Abstract

The invention discloses a chain transferring agent, a preparation method of the chain transferring agent, and application of the chain transferring agent to olefin polymerization reactions. The chain transferring agent is a random copolymer comprising an olefin unit with the structure shown as a formula (I) and a conjugate diene structural unit, the number-average molecular weight of the random copolymer is not larger than 20000, and R1, R2 and R3 are same or different and independently are H or a C1-C5 alkyl. By employing the chain transferring agent, a polymer with relatively narrow molecular weight distribution and relatively low flocculate content can be obtained, and also the mechanical properties of rubber made of the polymer can be improved. Additionally, the chain transferring agent is a non-thio-alcohol chain transferring agent, does not have offensive odor and exactly has industrial application prospect.

Description

technical field [0001] The invention relates to a chain transfer agent, a preparation method of the chain transfer agent, a chain transfer agent prepared by the method, and an application of the chain transfer agent in olefin polymerization. Background technique [0002] Free radical polymerization has the advantages of wide source of monomers, simple production process, various preparation methods, and low industrialization cost. It has become one of the most important reactions in the synthesis of polymers. However, in the free radical polymerization process, some elementary reactions will make the polymerization process difficult to control, so that it is possible to obtain a polymer with a wide molecular weight distribution, which directly affects the mechanical properties, thermal properties, etc. of the polymer, limiting its application. Therefore, synthesizing a chain transfer agent capable of controlling the molecular weight of the polymer and its distribution makes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F2/38C08F236/10C08F212/32C08L9/06
Inventor 杜昕张杰于国柱李传清徐林解希铭段海东齐玉霞苗玉红
Owner CHINA PETROLEUM & CHEM CORP
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