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Method for lowering melting point of fusible polyacrylonitrile resin

A technology of polyacrylonitrile resin and melting point, which is applied in the field of reducing the melting point of fusible polyacrylonitrile resin, can solve problems such as adverse effects on performance, and achieve the effects of improving flow properties, increasing melt index, and avoiding decomposition.

Inactive Publication Date: 2007-12-12
SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method for lowering the melting point of meltable polyacrylonitrile resin. The technical problem to be solved is to add a solid additive to the existing meltable polyacrylonitrile resin to make the meltable polyacrylonitrile resin The processing melting point of the polyacrylonitrile resin is reduced to below 200 ° C, and the added additives will not have adverse effects on the melt processing of the polyacrylonitrile resin and the performance of the product.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take the meltable polyacrylonitrile resin and additives and add them into a 2L open container equipped with a stirring device according to the required weight ratio, and stir for about 15 minutes until the additives and the resin are mixed evenly. If the additives are lumpy, first crush the additives into powder or fine particles, and the particle size should not exceed 200 mesh.

[0020] Fusible polyacrylonitrile resin is the copolymer of acrylonitrile and methyl methacrylate, based on the total amount of all polymerized units, the content of methyl methacrylate in the copolymer is 15% by weight, and the viscosity-average molecular weight of the resin is 4000, the melting point of the resin is 240°C, and the melt index measured at 240°C is 11g / 10 minutes.

Embodiment 2～8

[0022] Fusible polyacrylonitrile resin is the copolymer of acrylonitrile and acrylonitrile, based on the total amount of all polymerized units, the content of acrylonitrile in the copolymer is 14% by weight, and the viscosity-average molecular weight of polyacrylonitrile resin is 3500 . All the other are the same as embodiment 1

[0023] The specific additives used in each embodiment, the weight ratio of additives and polyacrylonitrile resin mixed, and the melting point and melt index of the mixture are listed in Table 1.

[0024] Further with the low-melting-point fusible polyacrylonitrile resin that embodiment 2~8 obtains as raw material, adopt the technology of melt spinning to carry out spinning, make the acrylic fiber of 1.46dtex, test the breaking strength and breaking elongation of fiber, its result sees Table 2.

[0025] Table 1.

[0026] Additives

Additives / Resins

(weight ratio)

melting point

(℃)

Melt Index

(g / 10min) ...

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Abstract

A process for lowering the fusion point of fusible polyacrylonitrile resin to lower than 200 deg.C features that the fusible polyacrylonitrile resin particles are proportionally and mechanically mixed with the solid additive chosen from p-hydroxybenzoic acid, meta-phenyldibenzoic acid and their mixture.

Description

technical field [0001] The invention relates to a method for lowering the melting point of meltable polyacrylonitrile resin, in particular to a method for lowering the melting point of meltable polyacrylonitrile resin by adding solid additives. Background technique [0002] Polyacrylonitrile resin is a high polymer with a wide range of uses, especially the performance of fibers made of polypropylene resin is similar to that of wool, and it occupies a large proportion in the total production of synthetic fibers. However, a defect of polyacrylonitrile resin is that the melting point (theoretical value is 319°C) is higher than the decomposition temperature (generally 250°C), so it cannot be processed by melting, and polyacrylonitrile fibers can usually only be processed by solution spinning. This spinning method uses a large amount of toxic, harmful or corrosive solvents. During the production process, the solvent must be recovered and purified, and the fibers must be washed an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L33/20C08K5/092
Inventor 李荣安季春晓杜欣庄王雁周涛
Owner SINOPEC SHANGHAI PETROCHEMICAL CO LTD