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Preparation method of aqueous sizing agent for carbon fibers

A carbon fiber and water-based technology, applied in the direction of carbon fiber, etc., can solve the problems that it is not suitable for use at low concentration and the particle size of the sizing agent is large, and achieve the effect of reproducibility and improvement of fiber performance

Inactive Publication Date: 2013-02-06
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to provide a method for preparing a water-based sizing agent for carbon fibers in order to solve the technical problem that the existing sizing agent has a large particle size and is not suitable for use at low concentrations

Method used

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  • Preparation method of aqueous sizing agent for carbon fibers
  • Preparation method of aqueous sizing agent for carbon fibers

Examples

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specific Embodiment approach 1

[0018] Specific embodiment one: the preparation method of the aqueous sizing agent that is used for carbon fiber in this embodiment is carried out according to the following steps:

[0019] 1. Preparation of epoxy emulsifier: Add 30-35 parts by weight of epoxy resin and 4-7 parts by weight of POSS to the organic solvent, and add 1-2 parts by weight of coupling agent at 80-90°C React for 1 hour, cool down to 40-50°C, then add 50-60 parts by weight of polyethylene glycol for mixing, add 3-6 parts by weight of coupling agent at 80-90°C for 2 hours, then vacuumize and lower to room temperature , to obtain epoxy emulsifier;

[0020] 2. Mix the epoxy emulsifier with the epoxy resin under the condition of 40-70°C. The amount of the epoxy emulsifier is 2-3 times the mass of the epoxy resin, and then add deionized water until the phase transition is obtained. Water-based sizing agent for carbon fiber.

[0021] The POSS structure described in this embodiment is as follows:

[0022] ...

specific Embodiment approach 2

[0023] Embodiment 2: This embodiment is different from Embodiment 1 in that the epoxy resin described in step 1 is epoxy resin EP-20. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0024] Embodiment 3: This embodiment is different from Embodiment 1 in that the coupling agent described in step 1 is diisocyanate or toluene diisocyanate. Others are the same as in the first embodiment.

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PUM

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Abstract

The invention provides a preparation method of an aqueous sizing agent for carbon fibers, relates to a preparation method of a sizing agent, and solves the technical problem that the existing sizing agent is large in particle size and not suitable for being used under low concentration. The method includes preparing an epoxy emulsifier; and mixing the epoxy emulsifier with epoxy resin under a temperature of 40-70DEG C, and then adding in deionized water until phase transition to obtain the aqueous sizing agent for the carbon fibers, wherein the adding amount of the epoxy emulsifier is 2-3 times that of the epoxy resin. According to the method, the sizing agent with a particle size and with a main peak of 0.1mum is prepared under a phase inversion method, the smaller the particle size, the easier to spread on the surfaces of the carbon fibers, so that the fiber performances are improved.

Description

technical field [0001] The invention relates to a preparation method of a sizing agent. Background technique [0002] Due to the low elongation and brittleness of carbon fibers, due to repeated friction, stretching and impact caused by processing movements, the fibers will appear fuzzy, loose or split. The quality of the product has been seriously affected, and the hairs are flying everywhere, which will cause open circuit accidents such as electrical equipment and instruments, and seriously affect the working environment. Secondly, the surface energy of carbon fiber after surface treatment increases, and it is easy to absorb moisture and impurities in the air. The longer the fiber surface is exposed to the air, the worse the effect of fiber surface treatment. Sizing can improve the active surface of fiber surface treatment. for protection. Finally, the sizing agent acts as a transition bonding layer between the carbon fiber and the matrix resin, and at the same time bonds...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M15/55D06M15/564D06M101/40
Inventor 刘丽张庆波黄玉东龙军姜大伟
Owner HARBIN INST OF TECH
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