JPH01176248A - Surface-treatment agent for glass fiber - Google Patents

Abstract

PURPOSE:To obtain a surface-treatment agent having excellent surface-protecting function to glass fiber and excellent compatibility in the following compounding process (formation of FRP), by compounding a filler. CONSTITUTION:The objective surface-treating agent for glass fiber contains a filler. The filer is preferably an organic filler such as nylon spheres or polymethacrylate spheres or an inorganic filler such as calcium carbonate, titanium oxide powder or silica powder. The particle diameter of the filler is preferably 0.01-1mum. The surface-treating agent may contain other conventional additives.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a surface treatment agent for glass fibers that is applied to the surface of glass fibers to prevent damage.

Prior art and its problems FIG. 1 is a schematic diagram showing a glass fiber spinning apparatus.

As shown in FIG. 1, the glass fibers 2 extruded from the nozzle 1 are coated with a surface treatment agent 4 by a surface treatment agent coating device 3 (see FIG. 2), and then collected and wound onto a winding drum 5. It will be done. Such glass fibers are particularly sensitive to abrasion and easily break when the surface is damaged. Therefore, during the process from spinning to winding, it is necessary to avoid contact with mechanical parts or direct contact between single fibers, and the glass fiber surface is coated and protected using a surface treatment agent.

Such surface treatment usually includes (1) a sizing agent (binder);
(plastic aqueous emulsion), (2) softener (cationic surfactant), (3) static remover, and (4) coupling agent. However, when the obtained glass fibers are composited into resin (FRP) as reinforcing fibers, the presence of such a protective film on the surface of the glass fibers is not preferable. In particular, when the components (1) to (3) above are present, the wettability between the glass fiber and the resin (liquid resin before curing) deteriorates, resulting in poor adhesion between the glass fiber and the resin. , the quality performance of the obtained FRP is significantly reduced.

In order to eliminate such adhesion defects, there are methods to incinerate the protective film on the glass fiber surface or remove it with detergent and then apply a new coupling agent and then composite it. FRP strength is significantly reduced due to thermal deterioration.

An object of the present invention is to provide a surface treatment agent that has both a protective function for the surface of glass fibers and compatibility during composite processing in a subsequent process.

Means for Solving the Problems The present invention provides a surface treatment agent for glass fibers characterized by containing a filler.

Fillers that can be incorporated into the surface treatment agent of the present invention include conventional fillers such as organic fillers such as nylon spheres and PMA (polymethacrylic acid) spheres, and inorganic fillers such as calcium carbonate, titanium oxide powder, and silica powder. is also suitably used.

Two or more of these fillers may be used in combination.

Moreover, it is preferable that the particle size of such filler is 0.01-1 μm.

As the sizing agent, which is another component of the surface treatment agent of the present invention, any of those used in conventionally known surface treatment agents, such as a plastic aqueous emulsion, and as the softener, such as a cationic surfactant, may be employed. . Furthermore, antistatic agents, coupling agents, and the like that are used in known surface treatment agents may be employed.

Next, FIGS. 3 and 4 show the results of testing the effects of varying the amount of filler added in the surface treatment agent according to the following composition.

Aetrapku binder: (manufactured by Kao Corporation) surfactant (trimethyltearylammonium chloride)
1 Antistatic agent (ammonium chloride) o, 5
Silane coupling agent 2 (KBM50
3: Made by Shin-Etsu Chemical Co., Ltd. Titanium oxide powder 0-1° (particle size:
200-500 people) Titanium coupling agent 2 (Blenact KR55: manufactured by Ajinomoto Co., Inc.) Water
Remaining amount Figure 3 shows the changes in the tensile strength of glass fiber when the amount of filler added is changed.
The figure shows the interlaminar shear strength (Adhesive Crab ILSS, JIS K 705) of unidirectionally reinforced FRP using this glass fiber.
7) shows the change.

From these results, the amount of filler added to the surface treatment agent is preferably 5 to 7% by weight.

If the amount added is less than this, the strength of the fibers and the adhesive force of FRP will decrease. On the other hand, even if the amount of filler added is larger than this, the adhesive force will be lower.

Next, the following components were mixed in a conventional manner to prepare a surface treatment agent.

Nutrac Binder (manufactured by Kao Corporation) surface-active trimethylstearylammonium chloride)
l Antistatic agent (ammonium chloride) o, 5 Silane coupling agent 2 (KBM503:
(manufactured by Shin-Etsu Chemical Co., Ltd.) Titanium oxide powder 4 (particle size: 200
~500 people) Titanium coupling agent 2 (Blenact KR55: manufactured by Ajinomoto Co., Inc.) Water
Remaining Amount In the spinning apparatus shown in FIG. 1, the surface treatment agent was put into the coating apparatus to surface-treat the spun glass fibers. Next, the glass fiber bundle was heat-treated at 80° C. for about 1 hour in a dryer to form a protective film. A binder (sizing agent) is applied to the surface of the glass fiber.
As a result, the titanium oxide powder was uniformly adhered and fixed.

Due to the bearing effect of particles on the glass surface,
Fuzzing, thread breakage, etc. caused by abrasion between fibers and damage caused by contact with machinery has been reduced, and the tensile strength of the roving (fiber bundle) has been improved by approximately 30%. In addition, since the unevenness of the glass fiber surface caused by the filler dispersed the cohesive force (surface tension) of the plastic stock solution, the wettability of the glass fiber was significantly improved. Furthermore, the adhesive strength between plastic and glass fiber is approximately doubled due to the anchoring effect of the unevenness of the glass surface and the synergistic effect of the coupling agent.

In this example, a titanium coupling agent was used to uniformly disperse the titanium oxide powder in the liquid.

Effects of the Invention The surface treatment agent for glass fibers of the present invention has an excellent protective function on the surface of glass fibers and suppresses the occurrence of fiber breakage, thereby reducing fuzz and thread breakage and increasing the strength of the fibers. improves. In addition, since it has excellent compatibility during post-process composite formation (FRP formation), it is not necessary to remove the protective coating of the processing agent, and the adhesive strength with the matrix resin is improved. Furthermore, it is possible to reduce the amount of expensive coupling agents used.

[Brief explanation of the drawing]

Figure 1 is a glass fiber spinning device, Figure 2 is a cross-sectional view of its surface treatment agent coating device, Figure 3 is a graph showing the relationship between the amount of filler added and the tensile strength of glass fiber, and Figure 4 is a graph showing the relationship between the amount of filler added and the tensile strength of glass fiber. It is a graph showing the relationship between the amount of addition and the interlayer shear strength (adhesive force) of unidirectionally reinforced FRPO using glass fiber coated with this surface treatment agent as a reinforcing fiber. The main symbols in the figure are as follows. 3. Coating device; 4: Surface treatment agent. Figure 1

Claims (1)

[Claims] (1) A surface treatment agent for glass fibers characterized by containing a filler.