Sizing agent for reinforced fiber and its application

Abstract

Provided are: a sizing agent for reinforcing fibers, which has high viscosity at high temperatures, while having excellent heat resistance at the same time; and reinforcing fibers which are provided with this sizing agent. A sizing agent for reinforcing fibers, which contains at least one component selected from among the component (I) and the component (II) described below. Component (I): a compound obtained by reacting a titanium compound (A) and a compound (B) having an active hydrogen group. Component (II): a titanium compound (A) and a compound (B) having an active hydrogen group. It is preferable that the compound (B) contains a compound (B1) having a hydroxyl group. It is also preferable that the compound (B1) contains at least one resin selected from among epoxy resins, polyester resins, urethane resins and polyether polyol resins.

Description

technical field [0001] The present invention relates to a sizing agent for reinforcing fibers and a reinforcing fiber obtained by adding the sizing agent for reinforcing fibers. Background technique [0002] By coating the fibers with a sizing agent, various properties can be imparted: improving the bundling property and smoothing the manufacturing process, adjusting the texture of the manufactured fibers, and imparting functions to the fibers. Among these properties, bundling is one of the most important properties for improving production efficiency and quality. It is greatly affected by the viscosity of the sizing agent. When the viscosity is low, problems such as low bundling and fluffing of fibers may occur. Therefore, as described in Patent Document 1, it is very important to increase the viscosity of the sizing agent in order to improve the bundling properties. [0003] The sizing agent for reinforcing fibers is coated on the surface of the reinforcing fibers. Vario...

AI Technical Summary

Problems solved by technology

[0004] At this time, if the sizing agent is decomposed by heat, the adhesion between carbon fibers and the like and the matrix resin will decrease; the decomposed product will gasify, resulting in voids, and FRP that cannot satisfy the desired physical property values ​​may be performed.

In addition, when FRP is made, it is exposed to a high-temperature environment as described above. Therefore, if the viscosity of the sizing agent is low at high temperature, it may be excessively dispersed and the carbon fiber may be broken, so the specified performance may not be exhibited.

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