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Preparation method and application of thermoplastic acrylonitrile-based terpolymer

A technology of acrylonitrile-based terpolymers and acrylonitrile terpolymers, applied in the direction of single-component synthetic polymer rayon, textiles and papermaking, fiber chemical characteristics, etc., can solve the problem of very high precision and performance Poor repeatability and other problems, to achieve the effect of simple and easy to control polymerization process, wide range of melting processing temperature and good adaptability

Active Publication Date: 2015-12-30
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The study found that the preparation technology of the melt-processable acrylonitrile copolymer also adopts the method of controlling the concentration of the reaction monomer, which requires very high precision of the process, and the repeatability of various performances of the product is poor.

Method used

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  • Preparation method and application of thermoplastic acrylonitrile-based terpolymer
  • Preparation method and application of thermoplastic acrylonitrile-based terpolymer
  • Preparation method and application of thermoplastic acrylonitrile-based terpolymer

Examples

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Embodiment 1

[0033] A reactive monomer for preparing thermoplastic acrylonitrile-based terpolymer, which consists of acrylonitrile, methyl methacrylate and dimethyl maleate in a molar ratio of 80.0:19.5:0.5.

[0034] A preparation method of thermoplastic acrylonitrile-based terpolymer, the steps are as follows:

[0035] Add 0.6L deionized water to the 2L reaction kettle, pass through N 2 The air in the reaction kettle was discharged, the temperature of the reaction system was raised to 70°C, and a compound emulsifier (the mass ratio of OP-10 and sodium lauryl sulfate was 1:9) was added with a total monomer amount of 1.5wt.%. , add the monomer premix that accounts for 1 / 2 of the monomer premix mass, the chain transfer agent dodecyl mercaptan that accounts for 5wt.% of the total amount of reaction monomers and the initiator that accounts for 1wt.% of the total amount of reaction monomers Ammonium persulfate (ammonium persulfate is added in the form of an aqueous solution with a concentration ...

Embodiment 2

[0040] A reactive monomer for preparing thermoplastic acrylonitrile-based terpolymers, consisting of acrylonitrile, methyl methacrylate and dimethyl fumarate in a molar ratio of 85.0:4.5:10.5.

[0041] A preparation method of thermoplastic acrylonitrile-based terpolymer, the steps are as follows:

[0042] Add 0.8L deionized water to the 2L reaction kettle, pass through N 2 The air in the system was discharged, the temperature of the reaction system was raised to 50°C, and a compound emulsifier (a mixture of Tween-60 and sodium lauryl sulfate with a mass ratio of 9:1), Add monomer premix accounting for 1 / 5 of the total monomer premix (the molar ratio of acrylonitrile, methyl methacrylate and dimethyl fumarate is 85.0:4.5:10.5), and then add 0.4wt.% initiator sodium persulfate (sodium persulfate is added in the form of an aqueous solution of 0.1wt.% with a concentration of 0.1wt.%); Mercaptan, after reacting for 1h, adjust the reaction temperature of the system to be 60°C, add...

Embodiment 3

[0046] A reactive monomer for preparing thermoplastic acrylonitrile-based terpolymer, which consists of acrylonitrile, methyl acrylate and dimethyl maleate in a molar ratio of 88:11:1.

[0047] A preparation method of thermoplastic acrylonitrile-based terpolymer, the steps are as follows:

[0048] Replace sodium lauryl sulfate in Example 1 with SP-80, and the mass ratio of the two single components of the compound emulsifier is 8:2; replace methyl methacrylate with methyl acrylate, and the feeding mole of three monomers The ratio is 88:11:1, and the others are the same as in Example 1 to obtain an acrylonitrile-based terpolymer.

[0049] The experimental results of differential scanning calorimeter and thermogravimetric analysis show that the obtained thermoplastic acrylonitrile-based terpolymer has a glass transition temperature of 82°C, a melting point of 177°C and a thermal decomposition temperature of 329°C. Adopt gel permeation chromatography to characterize the molecula...

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Abstract

The invention discloses a preparation method and an application of a thermoplastic acrylonitrile-based terpolymer. In the preparation method, a selected reactive monomer consists of an acrylonitrile monomer, a second monomer and a third monomer. A method for preparing the thermoplastic acrylonitrile-based terpolymer with the reactive monomer comprises the following steps: adding an emulsifying agent into a reaction container filled with deionized water under an oxygen-free condition; adding a chain transfer agent, an initiator and the reactive monomer; reacting at a temperature being 20 to 90 DEG C for 3 to 16 hours to obtain an emulsion; demulsifying the emulsion and standing; performing suction filtration in vacuum to collect a solid; washing the solid with acetone; washing with the deionized water; finally drying in vacuum to obtain powder, namely, the thermoplastic acrylonitrile-based terpolymer. An obtained product can be directly processed into polyacrylonitrile fibers or a polyacrylonitrile film with a melt spinning method, has high performance, and is low in cost.

Description

technical field [0001] The invention relates to the field of preparation of acrylonitrile-based terpolymers, in particular to a preparation method and application of thermoplastic acrylonitrile-based terpolymers. Background technique [0002] Polyacrylonitrile fiber is one of the most important textile polymer fiber materials, and it is also the most important carbon fiber matrix raw material. Polyacrylonitrile macromolecule has a special structure, its decomposition temperature is about 250°C, its melting point is about 317°C, and its decomposition temperature is lower than its melting point. Crosslinking and cyclization have occurred without melting during heating, so solution spinning processes have been used in industrial production, including dry, wet and dry-wet methods, to produce polyacrylonitrile fibers. The solution spinning process is long, and there are environmental pollution problems to varying degrees. Compared with the solution spinning process, the melt sp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/44C08F220/14D01F6/40D01F6/38
Inventor 张兴祥韩娜谭林立李玉林于思聪王天宇
Owner TIANJIN POLYTECHNIC UNIV
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