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Process for preparing nano SiO2 modified carbon fiber emulsion pasting agent

A modified carbon and nanotechnology, applied in fiber processing, fiber chemical characteristics, textiles and papermaking, etc., can solve the problems of general interface performance, influence of interface adhesion of sizing carbon fiber composites, poor compatibility, etc.

Active Publication Date: 2005-06-29
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

At present, according to the report of the Fifth National Symposium on New Carbon Materials in China, the interlayer shear of composite material splines when polyurethane modified epoxy resin is used as carbon fiber sizing agent when the polyurethane content accounts for 40% of the epoxy resin mixed emulsion The shear strength (ILSS) has reached 95.0MPa, but due to the large content of polyurethane, the compatibility between the emulsion and the epoxy resin matrix is ​​poor, so the interfacial adhesion of the sizing carbon fiber composite material is affected; according to US Patent US4420512, Dec.13, 1983 It is reported that the emulsion-type sizing agent consisting of epoxy resin, emulsifier, lubricant, softener and diluent has excellent emulsion stability and thermal stability, but the interfacial properties of sized carbon fiber composites are mediocre

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add KH-570 and nano-SiO to the 2L reactor 2 , Epoxy resin AG-80 and acetone are mixed to obtain modified epoxy resin, and the weight ratio of the four is 1: 20: 10000: 1000. In another 2L stirred reactor, the emulsifier alkylphenol polyoxyethylene (10) ether (OP-10), sorbitan fatty acid ester (S-60) and sorbitan fatty acid ester polyoxyethylene Ether (T-80) was mixed in a weight ratio of 3:5:2 and heated to 80°C. Its hydrophilic-lipophilic balance (HLB) was 9.82. After stirring evenly, it was cooled to room temperature to form a light yellow paste solid, which was made into a mixed emulsifier. Mixed emulsifier and nano-SiO 2 The modified epoxy resin AG-80 was melted and mixed at a weight ratio of 8:100 and stirred evenly, and deionized water was slowly added until the mass fraction of the total solid content was 5%, and the water was added while stirring rapidly with an emulsifier, and the rotation speed was 13000r / min, stirring for 50min to obtain a white emulsion. ...

Embodiment 2

[0020] The preparation method of sizing agent is the same as example 1. Dilute the obtained emulsion to 1%, and then sizing the T300 carbon fiber with a strength of 3.53GPa. The dipping time is 60s, and the water is dried at 125°C for 5 minutes. The samples are placed in a desiccator for later use. The strength of the carbon fiber is 3.78GPa, an increase of 7.2%; the interfacial shear strength (IFSS) of the single fiber composite is 35.01MPa; the interlaminar shear strength (ILSS) of the fiber composite is 89.5MPa.

Embodiment 3

[0022] The preparation method of sizing agent is the same as example 1. Dilute the obtained emulsion to 1.5%, and then sizing the carbon fiber with a strength of 3.53GPa T300. The dipping time is 90s, and the water is dried at 125°C for 5 minutes. The samples are placed in a desiccator for later use. The strength of the carbon fiber is 3.77GPa, an increase of 6.8%; the interfacial shear strength (IFSS) of the single fiber composite is 36.80MPa; the interlaminar shear strength (ILSS) of the fiber composite is 93.4MPa.

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Abstract

A preparation method of a nano-SiO2 modified carbon fiber emulsion sizing agent, which uses nano-SiO2 as a sizing resin modification material, and the modified material, sizing resin, emulsifier, dispersant, organic solvent and particle-free water are prepared in a certain weight ratio Carbon fiber-forming functional emulsion sizing agent. After the carbon fiber is impregnated with a certain concentration of modified sizing agent for an appropriate time, the strength of the carbon fiber increases by up to 8.7%; the interfacial shear strength (IFSS) of the single fiber composite material can reach up to 43.67MPa; ILSS) up to 98.7MPa.

Description

technical field [0001] The invention belongs to the preparation of a carbon fiber functional emulsion sizing agent. Background technique [0002] Carbon fiber has a series of excellent properties such as high specific strength, high specific modulus, high temperature resistance, fatigue resistance, creep resistance, electrical conductivity, heat transfer and small thermal expansion coefficient, and is widely used in fiber-reinforced resin-based composite materials. However, carbon fiber is a brittle material. During the production and processing process, the wool and monofilament are easily broken by mechanical friction, which reduces the strength of carbon fiber and affects the mechanical properties of composite materials. Sizing carbon fiber can solve this problem well. The sizing agent not only protects the carbon fiber, but also can enhance the interfacial bonding between the fiber and the matrix resin in the carbon fiber composite material, and improve the mechanical p...

Claims

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Application Information

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IPC IPC(8): D01F9/12D06M15/55
Inventor 吕春祥王心葵杨禹
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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