KR890003158B1 - Drying-dripping apparatus for frp - Google Patents

Abstract

An apparatus includes (a) roving grille wound with fiber yarn, (b) dipping bath (12) having guide rollers (8,8') and conveyor rollers (9a,9b,9c,9d) to dip fiber yarn into thermosetting resin, (c) a guide metal form, (d) a die with a preheater, (e) conveyor rollers, (f) a cutter, (g) a drying chamber (7) having thermo/ hygrometer (4), air inlet/outlet (5,5'), far ir oscillator (2,2'), open/close door (3,3') and rollers (1,1') and (h) water pipe (11) joined with the prehater at the bottom of bath (12).

Description

Dry impregnation device of FRP reinforced material

1 is a schematic diagram of an FRP manufacturing process of the present invention.

2 is a schematic longitudinal sectional view of the present invention.

3 is a plan view of an impregnation tank showing a state in which the fiber yarn passes through the roller on the impregnation tank of the present invention.

* Explanation of symbols for main parts of the drawings

1,1 ': Roller 2,2': Far infrared heater

3,3 ': Retractable door 4: Temperature and hygrometer

5,5 ': Air inlet and outlet 6,6': Guide panel

7: drying chamber 8,8 ': guide roller

9a, 9b, 9c, 9d: feed roller 10: guide mold

11: water pipe 12: impregnation tank

13: resin liquid

The present invention relates to a drying impregnation apparatus for reinforcing materials capable of producing high-quality precision products by smoothly impregnating the reinforcing materials in a continuous drawing molding method of a fiber-reinforced plastic product.

Pultruded molding is a method of manufacturing fiber-reinforced plastic (FRP) products, which is a relatively new plastic molding method with its origin in the 1950s. Generally speaking, the reinforcing material is continuously impregnated with a resin and passed through a die of a predetermined cross-sectional shape. It is a method of carrying out continuous mass drawing of a product having a uniform cross section and a die mold shape by thermal curing.

As the reinforcing material used in the pultrusion method, any filamentary material having strength such as glass fiber or aramid fiber is used, and a mixed filament reinforcing material such as roving, mat, and cross is used, but the most widely used in terms of price As a blended glass fiber and polyester yarn containing about 50%, for example, Lucky Co., Ltd. RS 240 R 50 (2.4g glass fiber per 1m of mixed yarn, 50% content). Thermosetting resins such as epoxy resins, unsaturated polyester resins, phenol resins, and polyamide resins may be used as resins, but the general properties of polyester resins, for example, because of their excellent properties in high strength products having corrosion resistance, electrical resistance, and light weight, Unsaturated polyester resins are used a lot, for example, Liquid Unsaturated Polyester Resin for Reinfored Plastics produced by Miwon Co., Ltd. is used. About 65% -95% is unsaturated polyester resin and the rest Is the situation using an epoxy resin.

However, polyester reinforcing materials such as RS 240 R 50 contain about 1.0% -1.5% of moisture because they are exposed to air. When impregnated with, the water contained in the fiber yarn caused bubbles around the fiber yarn, so that impregnation was not good and cracks occurred in the product even after curing.

When impregnating fiber yarns with a resin solution, hundreds of fibers (usually 200-500 strands) wound on roving grills are entangled with each other or are formed in a part which is not impregnated with a resin, and mixed with unsaturated polyester resins. Additives For example, agglomeration and separation of fillers, curing agents, accelerators, and release agents resulted in problems in maintaining the strength of the product and incapable of producing precision products.

Therefore, the present invention is to provide a drying impregnation device of reinforcing material (fiber yarn) to improve the impregnation of the resin to produce a high-quality product by drying the fiber yarn drawn from the roving grill and passing through a roller installed with a spiral groove. It is.

In general, the resin impregnation degree varies depending on the viscosity of the resin, the impregnation time, the temperature of the resin, the amount of the resin, the humidity of the fiber yarn, etc. The unsaturated impregnation resin is maintained at a constant temperature and degree using the drying impregnation apparatus according to the present invention. The complete reinforcement of the dried reinforcing material (fiber yarn) to improve the quality and strength of the product and to shorten the curing time to increase the productivity as described in detail by the accompanying drawings as follows.

As shown in FIG. 1 to FIG. 3, the present invention provides rollers 1 and 1 'at the inlet and outlet of the drying chamber 7, which is closed by an openable door 3 and 3', and has a fiber yarn feed passage inside the drying chamber. Far-infrared heating device (2, 2 ') is installed in the upper and lower guide rollers (8, 8) in a conduit tank (12) having a water pipe (11) with a hot water circulation device installed at the bottom with the guide panel (6') in between. 8 ') and feed rollers 9a, 9b, 9c, and 9d are constructed.

Hundreds of fiber yarns drawn from the roving grill on the left side of FIG. 1 are coupled to a suitable size by a guide panel 6 and transferred to a drying chamber 7 enclosed by a roller 1 installed in an openable door 3. do.

In the drying chamber (7), there are far-infrared heat generating devices (2, 2 ') and air inlets and outlets (5, 5') for controlling the inflow and outflow of air, so that the temperature and humidity in the drying chamber are automatically connected to the temperature and hygrometer (4). Controlled by a controller (not shown).

The fiber yarn contains 1.0% -1.5% moisture in the air, and the temperature of the drying chamber is maintained at about 65 ° C, and the moisture content is dried at about 0.5%, followed by the roller (1 ') and guide panel in the open door (3'). (6 ') is neatly gathered and bundles are conveyed to the impregnation tank (12).

The conveyed fiber yarn is separated up and down by the guide roller 8 and the grooves are sequentially passed through the feed rollers 9a, 9b, 9c, and 9d installed at regular intervals, and the known unsaturated polyester resin in the sedimentation tank 12 is provided. The solution 13 is sufficiently impregnated to prevent entanglement of the fiber yarn.

In the feed rollers 9a, 9b, 9c, and 9d, the fiber yarns are transferred between the grooves in which the grooves are installed at regular intervals, and the fiber yarn strands passing through the first grooves of the primary roller 9a are separated and passed through the second grooves. Passes through four feed rollers (9a, 9b, 9c, 9d) in the resin solution, repeating the separation of the fiber yarns in such a way that they pass through the first groove of the secondary roller (9b) in combination with the separated one of the fiber yarn strands. When the fiber is vertically impregnated with the vertical liquid.

At this time, since the unsaturated polyester vertical liquid 13 in the impregnation tank 12 starts to harden at 80 ° C. or higher, it should always maintain a temperature below that. 11) Since the temperature in the impregnation tank 12 is kept constant by using hot water discarded after preheating the die mold during the machine operation, the temperature of the preheater is always automatically controlled to keep the temperature below 80 ° C in the machine operation. When the hot water with residual heat is transferred to the water pipe of the lower part of the impregnation tank 12, a temperature (approximately 40 ° C.) which is most suitable for impregnation can be obtained, so that a separate heating device or temperature control device is not required.

The degree of impregnation of the resin is that the viscosity of the resin plays an important role, but usually 20-25 poise is most suitable.

In addition, a small amount of catalyst may be mixed with the resin to allow substantially sufficient time to elapse during the residence time in the filler or draw-out die, and a polymerization inhibitor or mold release agent may be used to prevent the resin from gelling. In order to improve the commerciality of the product, a metal oxide such as TiO ₂ may be mixed with the resin liquid to obtain the color of the product.

EXAMPLE

In order to manufacture 2 inch thick FRP channel, RS 240-R 50, 232 strands of yarn produced by Lucky Co., Ltd. are extracted from roving grill, and then combined into multiple strands at the guide panel.

While maintaining the temperature of the drying chamber at 65 ℃, the moisture content of the fiber yarn is dried from 1.0-1.5% to 0.5%.

The guide panel is transferred to the feed roller installed in the impregnating tank.The feed rollers are equipped with 40 round recesses, so that the fiber thread strands pass through the resin liquid while separating and separating the fiber strands into the guide rollers. Pass it through.

At this time, the temperature of the resin was maintained at about 40 ℃ using hot water with the residual heat of the yale device of the die mold, the viscosity was adjusted to 20-25poise and a few other catalysts, fillers, release agents and the like.

The test values of the products produced through the die mold and the drawing machine are as follows.

Performance analysis table of this product in drawing direction

In the above description, a glass fiber yarn containing about 50% of glass fiber and polyester is used, but a reinforcing material is not limited thereto in order to use the apparatus according to the present invention.

By using such a device, continuous molding of FRP products, cooling and cutting of products transferred to conveyor belts, and production of finished products make it easier to impregnate resins in impregnation tanks while increasing the efficiency of 2-4 times than conventional ones with a few manpower. As a result, it is possible to increase the strength of the product, to prevent deformation of the product, to shorten the curing time, to increase productivity, and to eliminate the aggregation and separation of various additives (fillers, curing agents, accelerators, and release agents). You can wait. In addition, because the temperature of the impregnation tank is maintained by using hot water that is discarded after preheating the die mold, a separate heating device or temperature control device is not necessary, which saves fuel and the temperature can be controlled at a constant rate with the speed of product production. It is

Most shapes of products produced by the RP method are solid, hollow or virtually unlimited and include, for example, H beams, chanels, flange beams, solid bars or lots, round tubes and square tubes, angles, Almost all construction materials such as flat sheets, automobiles, aircrafts, etc. are widely used.

Claims (1)

In the FRP continuous drawing machine consisting of a roving grill wound with fiber yarn, an impregnation tank for impregnating fiber yarn in a thermosetting resin, a die die with a preheating device, a drawing machine, and a cutter, the fiber sent to the roving grill A thermo-hygrometer (4) is attached to the inside to dry the yarn, and has controllable air inlets and outlets (5, 5 '), and a far infrared heating device (2, 2') is installed on the upper and lower parts of the inside, and is closed and closed on both sides. Impregnation tank 12 with guide rollers 8, 8 'and transfer rollers 9a, 9b, 9c, 9d, with drying chamber 7 with doors 3, 3' and rollers 1, 1 '. Dry impregnation device of the FRP reinforcing material, characterized in that the impregnation temperature is adjusted by installing a water pipe (11) associated with the preheating device of the die mold.

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