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Polyamide acid aqueous sizing agent as well as preparation method and application thereof

A polyamic acid water-based, polyamic acid technology, used in textiles and papermaking, fiber processing, carbon fiber, etc., to achieve the effect of promoting contact, good particle size distribution uniformity, and good film-forming performance

Active Publication Date: 2014-08-20
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that current temperature-resistant thermoplastic sizing agents generally contain organic solvents, the present invention provides a temperature-resistant thermoplastic carbon fiber water-based sizing agent that can improve the interfacial bonding strength between carbon fibers and thermoplastic resins and is suitable for industrial applications, and the sizing agent Preparation and Application Methods

Method used

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  • Polyamide acid aqueous sizing agent as well as preparation method and application thereof
  • Polyamide acid aqueous sizing agent as well as preparation method and application thereof
  • Polyamide acid aqueous sizing agent as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Under nitrogen protection, weigh 322.22g of 3,3',4,4'-benzophenonetetracarboxylic dianhydride, and add it to 1.66L of N,N'-dimethylformamide under stirring conditions, After all the solution was dissolved, 200.24 g of 4,4'-diaminodiphenyl ether was added, and the polycondensation reaction was continued for 2 hours at 0° C. under stirring to obtain a homogeneous and transparent polyamic acid solution. Next, vacuum-dry the polyamic acid solution at 40° C., and pulverize it to obtain polyamic acid powder. Then 50 g of polyamic acid powder was weighed and added to 1 L of deionized water, and 5 g of triethylamine was slowly added to the system under stirring. Continue to maintain the temperature and stir for 1 h after stopping the addition of the ionizing agent to obtain a polyamic acid water-based sizing agent.

[0034]Before sizing, add deionized water into the sizing agent under the condition of stirring, so that the final concentration is 0.5wt%. The prepared sizing...

Embodiment 2

[0036] Under the protection of argon, weigh 218.12g of pyromellitic dianhydride, add it into 1.77L of N,N'-dimethylacetamide under stirring conditions, and add 200.24g of 3, For 4'-diaminodiphenyl ether, the polycondensation reaction was continued for 24 hours at 25° C. under stirring conditions to obtain a homogeneous and transparent polyamic acid solution. Next, vacuum-dry the polyamic acid solution at 80° C., and pulverize it to obtain polyamic acid powder. Then weigh 50 g of polyamic acid powder and add it into 1 L of deionized water, and slowly add 20 g of tributylamine into the system under stirring until the polyamic acid is completely emulsified. After stopping the addition of the ionizing agent, continue to maintain the temperature and stir for 3 hours to obtain a polyamic acid water-based sizing agent.

[0037] Before sizing, add deionized water into the sizing agent under the condition of stirring, so that the final concentration is 1%. Pour the prepared siz...

Embodiment 3

[0039] Under the protection of nitrogen, take by weighing 520.49g of bisphenol A type dianhydride, join in the N-methylpyrrolidone of 1.84L under the condition of stirring, treat to add the m-phenylenediamine of 108.14g after all dissolving, polycondensation reaction is in Continue for 12 hours at 15° C. under stirring conditions to obtain a homogeneous and transparent polyamic acid solution. Next, vacuum-dry the polyamic acid solution at 60° C., and pulverize it to obtain polyamic acid powder. Then weigh 200 g of polyamic acid powder and add it to 1 L of deionized water, and slowly add 10 g of tripropylamine into the system under stirring until the polyamic acid is completely emulsified. After stopping the addition of the ionizing agent, continue to maintain the temperature and stir for 2 hours to obtain a polyamic acid water-based sizing agent.

[0040] Before sizing, add deionized water into the sizing agent under the condition of stirring, so that the final concentr...

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Abstract

The invention discloses a polyamide acid aqueous sizing agent as well as a preparation method and application thereof, and provides a polyamide acid aqueous sizing agent prepared from polyamide acid, a cationization reagent and deionized water in a self-emulsifying manner. The sizing agent can be used for obviously improving the interface bonding strength between a reinforced fiber and thermoplastic resin, and has the advantages of good film-forming property, high storage stability and the like. The polyamide acid aqueous sizing agent is simple and reliable in preparation process, high in production efficiency, and convenient to achieve industrial preparation and application.

Description

technical field [0001] The invention belongs to the technical field of synthetic fiber sizing agents, and relates to a polyamic acid water-based sizing agent for synthetic fiber sizing and a preparation and use method thereof. Background technique [0002] Carbon fiber has a series of excellent properties such as low density, high strength, high modulus, fatigue resistance and creep resistance, and is currently the most widely used advanced composite material reinforcement in high-tech fields. Since the commercialization of carbon fiber, due to the continuous growth of people's demand for higher performance of composite materials, the research on carbon fiber has been concerned by researchers, and carbon fiber sizing agent is a very important part of it. On the one hand, the purpose of carbon fiber sizing is to protect the fibers from mechanical damage during subsequent processing, significantly reduce the generation of wool and broken filaments, and maintain the origi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M15/59D06M13/328D06M11/60C08G73/10D06M101/40
Inventor 吕春祥张寿春原浩杰
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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