JPS6366939B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reinforcing mat suitable as a reinforcing body for compositions such as mortar or resin, and a method for producing the same.

Glass fiber-reinforced mortar (GRC) is a chopped glass fiber bundle (hereinafter referred to as chopped strand).
It can be manufactured by pre-mixing (abbreviated as CS) and mortar and molding and hardening it into a predetermined shape, but this method has the following drawbacks.

(1) When mixing CS and mortar, the glass fibers are easily damaged and their strength decreases.

(2) In order to thoroughly mix CS and mortar, it is necessary to use mortar with high moisture content and good fluidity, making it difficult to obtain a cured product with high strength.

(3) In order to mix CS and mortar sufficiently,
It is necessary to use a relatively short CS, and it is difficult to obtain a cured product with sufficient strength.

(4) During mixing, CS opens and becomes entangled, making it difficult to obtain a uniform product.

In order to solve the difficulties associated with mixing mortar and CS, a method has been proposed in which CS and mortar are simultaneously sprayed onto the mold surface, but it is difficult to obtain a homogeneous product without cavities that is unlikely to cause delamination, etc. There is a drawback.

In order to solve the above-mentioned difficulties, a method (referred to as a casting method) has also been proposed in which mortar is injected into a glass fiber reinforced body that has been given a predetermined shape in advance. The present invention is
In the process of conducting various experiments on reinforcing bodies made of glass fiber bundles used in the casting method, we investigated ways to solve the problems of delayed mortar hardening at the interface of the reinforcing bodies, which sometimes occurs, and the resulting decrease in strength. As a result, we have arrived at the present invention. As described below, it has been found that the reinforcing body of the present invention has the following advantages.

(1) In the present invention, since the glass fiber bundles constituting the reinforcing mat are coated with a cured product of polyester resin, epoxy resin, phenol resin, or melamine resin, deterioration of the glass fiber bundles due to alkali can be effectively prevented.

(2) Furthermore, compared to ordinary chopped strand mats, the mat of the present invention has a higher compression ratio even when the glass fiber bundles are thinner, makes it difficult for the glass fiber bundles to move, and reduces the passage resistance of coarse particles in the mortar. is also small, making it difficult for mortar components to separate.

Next, the present invention will be explained in more detail.

In the present invention, the weight per 1000m is 20~
Use a long glass fiber bundle of 50gr. Glass fiber bundles are manufactured by adding a sizing agent to glass fibers drawn from a bushing and converging them.The weight per 1000m of glass fiber bundles depends on the thickness of the glass fibers and the number of bundles. Determined. glass fiber bundle
The weight per 1000m (hereinafter referred to as thickness) is within the above-mentioned range, and the thickness and number of bundles of glass fibers to obtain suitable results are approximately 10 to 30μ and 30 to 7000, respectively. The sizing agent is suitably a liquid one containing a total solid content of about 3% of a film forming agent such as a vinyl acetate polymer or polyester, or a lubricant such as an amine surfactant. In addition, the amount of sizing agent added is 0.5 to 2% of the weight of the glass fiber bundle as a solid content.
It is appropriate to set it as a degree.

A long glass fiber bundle is dropped and deposited on a moving conveyor. Here, long refers to uncut continuous fiber bundles or cut pieces of 60 cm or more, preferably 100 cm or more. The glass fiber bundles are piled up on the conveyor in a non-directionally curved shape and intertwined with each other to form a mat-like material. The amount of accumulated glass fiber bundles is
Appropriately, it is about 300 to 1200gr/ ^m2 .

A thermosetting binder is added to the glass fiber bundle and heated to polymerize and harden the binder, thereby bonding the glass fiber bundles together. At this time, it is necessary to sufficiently polymerize the thermosetting binder; if the polymerization is insufficient, mortar hardening will be delayed and strength will decrease accordingly, and if polymerization is extremely low, the mortar may not harden. It turns out that there is something. For example, when a polyester resin emulsion is used in the production of continuous strand mats (CSM), which are conventionally used for FRP reinforcement, inhibition of mortar hardening cannot be effectively prevented under normal conditions. It is not possible to obtain a film that is sufficiently polymerized (although polymerization can be sufficiently increased by extremely increasing the heating temperature and heating time, this method is not practical).

Liquid unsaturated polyester resin, epoxy resin, phenolic resin, which has hardening properties on glass fiber bundles,
Alternatively, spray on melamine resin to form a thin film of the resin, and then heat at 80 to 160°C for about 1 to 3 minutes to harden the resin, bonding the glass fiber bundles together with the cured resin, and forming the glass fiber bundle. By forming a thin film of cured resin on the surface of the mat, it was possible to obtain a mat that is extremely suitable for the purpose of the present invention.

A preferred highly polymerized cured product is a mixture of liquid unsaturated polyester resin and styrene (the mixing ratio of the two is
(100 to 300:100 is appropriate). Alternatively, an epoxy resin containing a hardening agent can also be used.

The reason why mortar curing is delayed when the binder is insufficiently polymerized is not fully clear, but if the polymerization is insufficient, the alkaline components contained in the cement decompose the binder polymer molecules and the It is thought that the molecular components delay the hardening of mortar, and 1% glass fiber bundle matt
It has been found that suitable results can be obtained by using a binder whose elution amount when immersed in NaOH solution at 20°C for 5 minutes is 15 wt% or less of the total binder amount (loss on ignition).

For example, when polyester emulsion is used as in conventional CSM, the amount of alkali elution is
25wt%, which causes delay in mortar hardening,
When a mixture of unsaturated polyester and styrene is used, the amount of alkaline elution is 10 wt%, and very suitable results can be obtained.

The amount of resin to be added is appropriately determined so that the total amount of the resin and the sizing agent is 2 to 50 wt% based on the glass fiber bundle. If the amount of resin is too small, the effect will not be sufficient, and if the amount of resin is too large, the resin will not adhere uniformly, making it difficult to obtain a uniform product.

When the reinforcing body of the present invention is formed into a predetermined shape and impregnated with mortar, the mortar hardens quickly and is reinforced with long, undamaged glass fiber bundles, which provide high strength.
GRC can be obtained, and glass fibers are less likely to deteriorate due to alkali in mortar.

Next, examples of the present invention will be shown.

Example: A continuous strand of 200 glass fibers with a thickness of 13μ with a solid content of 1% vinyl acetate-based sizing agent and a weight of 83gr per 1000m is moved at a rate of 530gr/m ² on a conveyor. It was caused to fall and accumulate. Spray liquid unsaturated polyester resin (157BQT manufactured by Showa Kobunshi Co., Ltd.) containing 1% by weight of BPO and an air hardening agent onto the falling strands at a ratio of 15% by weight to the strands. 120℃
The resin was cured by heating for 2 minutes to obtain a mat-like material having a thickness of 7 mm, a bulk specific gravity of 87 Kg/m ³ , and an alkali elution amount of 10 wt%. As shown in Figure 1, mix this pine-like material with 5 parts by weight of Portland cement and sand (0.5 mm or less).
passing through a mortar consisting of 3 parts by weight and 3 parts by weight of water to impregnate the pine-like material with mortar,
Furthermore, spray mortar of the same composition on the top surface with a spray device, smooth the surface with a roller, and heat it at 50℃ for 5 minutes.
After curing for a period of time, the physical properties of GRC were measured after one month.
I got the following results.

Bending strength 384Kg/cm ² Tensile strength 141Kg/cm ² Izotsu impact strength 13.2Kg/cm ²

[Brief explanation of drawings]

Figure 1 shows the reinforcing mat of the present invention.
FIG. 2 is an explanatory diagram showing a method for manufacturing GRC. In the figure, 1 indicates reinforcing mat and 2 indicates mortar.

Claims (1)

[Claims] 1. A pine-like material in which long glass fiber bundles weighing 20 to 500 gr per 1000 m are piled up in a curved shape, and the glass fiber bundles have an alkali elution amount of 15%.
The following unsaturated polyester resin, epoxy resin, phenolic resin, or melamine resin cured product is coated and bonded to each other, and the ratio of the total amount of the sizing agent and resin cured product to the weight of the glass fiber bundle is A reinforcing mat characterized by a ratio of 2 to 50:100. 2. A step of depositing long glass fiber bundles weighing 20 to 500 gr per 1000 m on a moving conveyor to form a pine-like material, a step of applying an unsaturated polyester resin composition containing styrene, a pine-like material A method for producing a reinforcing pine comprising the step of heating and curing a resin composition.