JP2548680B2 - Fiber-containing resin and method for producing the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sludge inside a cooling pipe in order to maintain the performance of a condenser that cools steam discharged mainly from a nuclear power plant or a thermal power plant with water to condense it. Most suitable for cleaning brushes that remove scales such as scales and shells on the inner surface of cooling pipes while extruding impurities such as sand and sand, abrasives for various machine parts, strong cushioning materials, barrel abrasives, etc. And a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, a cleaning brush for cleaning the inside of a cooling pipe of a condenser of this type, an abrasive material for various machine parts, a cushion material having high strength, a barrel abrasive material, etc., are formed of synthetic rubber or the like. It was

[0003]

However, in particular, a cleaning brush or the like for cleaning the inside of the condenser cooling pipe of the condenser is inserted into the cooling pipe at the time of cleaning, and air or water is sent from behind at a high pressure to apply pressure to cool the condenser. Tear strength in relation to running scale from one end to the other end inside the cooling pipe while adhering to the inner surface of the pipe, extruding impurities such as sludge and sand inside the cooling pipe and removing scales such as scales and shellfish on the inner surface of the cooling pipe Strong, durable and light weight are required, but conventional synthetic rubbers have weak tear strength, poor durability and heavy weight. there were.

Therefore, the present invention was created in order to solve the above-mentioned problems, and it is extremely durable and more lightweight than the conventional synthetic rubber products. The present invention provides a resin and a method for producing a fiber-containing resin that can easily and reliably produce a fiber-containing resin to a required hardness.

[0005]

In order to achieve the above-mentioned objects, the resin containing fibers of the present invention is a synthetic resin such as a soft and elastic foam or solid synthetic resin, natural fiber or metal. Various types of fibers such as fibers are impregnated to form a sheet or block.

On the other hand, in the manufacturing method of the present invention, an appropriate amount of a two-liquid mixing type low-viscosity two-liquid urethane foaming agent is injected into a molding die of an appropriate shape and size by an appropriate number of nozzles such as a dispenser, After inserting the target fiber cut into the required shape from above onto the two-component urethane foaming agent, apply the two-component urethane foaming agent to the target fiber with an appropriate pressing jig. Press to an appropriate position where it is fully impregnated, then immediately remove the pressing jig to release the two-component urethane foaming agent and fibers to the natural state, and finally fix the lid tightly on the upper side of the mold. Then, natural curing, heat curing,
Moisture cure.

[0007]

With the above-described technical means, the fiber-containing resin of the present invention is such that the synthetic resin on the cut surface of the outer circumference is pulled inward by stress, and only the fiber remains protruding on the cut surface of the outer circumference. The tear strength should be much higher than that of conventional synthetic rubber.

Further, in the method for producing a resin containing fibers of the present invention, the hardness and the expansion ratio of the two-pack type urethane foaming agent, the density of the fibers, etc. can be arbitrarily selected at the time of production.

[0009]

An embodiment of the present invention will be described below with reference to the drawings.

The fiber-containing resin A of the present invention is shown in FIGS.
As shown in (1), a synthetic resin B such as a soft and elastic foam or solid is impregnated with various fibers C such as synthetic fibers, natural fibers, and metal fibers to be molded into a sheet or block. For example, in the case of a cleaning brush for cleaning the inside of the cooling pipe of a condenser, as shown in FIG. 1, a cylindrical body D whose outer diameter is substantially the same as the inside diameter of the cooling tube is formed, and the cooling pipe inside is formed on the outer peripheral surface of this cylindrical body D. Several grooves E for fitting scales such as scales and shells on the surface are arranged at appropriate intervals in the longitudinal direction, or as shown in FIG. 2, a cylindrical body D whose outer diameter is substantially the same as the inner diameter of the cooling pipe. Only, or as shown in FIG. 3, a spherical body F having a diameter substantially the same as the inner diameter of the cooling pipe is formed.

The types of the fibers C include synthetic fibers, natural fibers, metal fibers and the like. The synthetic fibers include polyester, nylon, carbon and the like, and the natural fibers include wool, pig hair, horse hair and the like. And the metal fibers include stainless steel, brass, iron and the like.

The synthetic resin B must be a soft and elastic resin, and includes foams and solids. The foams include urethane, silicone, natural rubber, etc. Has silicone, nitrile rubber (NBR), polyurethane and the like.

On the other hand, as a typical example of the method for producing the resin A containing fibers of the present invention, a state where a two-component urethane foaming agent is used will be described. First, as shown in FIG. And above the mold 1 set to the size,
Use the one that covers the lid 3 attached with the sealing clamp 2 so that it can be opened and closed freely, and use the two-liquid type urethane foaming agent 4 which is a two-liquid mixing type low viscosity and has a usable life of 110
Since it is as short as a second, the dispenser uses a gear pump system and uses four nozzles 5. And in the mold 1
2 liquid type urethane foaming agent 4 each nozzle 5 of dispenser
Then, about 30% is injected while moving so that it spreads over the entire bottom of the mold 1. In this case, since the injection amount is about 30% of the whole mold 1, the expansion ratio is about 3%.
It is about double.

Subsequently, as shown in FIG. 5, on the two-component urethane foaming agent 4 injected into the molding die 1 by about 30%,
The target fiber 6 cut into a desired shape is quickly inserted into the molding die 1 from above from above.

Next, as shown in FIG. 6, the target fiber 6 is moved to an appropriate position where the fiber 6 is sufficiently impregnated with the two-component urethane foaming agent 4 by a pressing jig 7 connected to an air cylinder. Press. In this case, the pressing jig 7 is preferably one having the same area as the fiber 6 or one having the same outer diameter as the inner diameter of the molding die 1, and the pressure value depends on the hardness of the fiber 6 but is 3 kg. A degree is preferable.

Then, as shown in FIG. 7, the pressing jig 7 is immediately removed to release the two-component urethane foaming agent 4 and the fiber 6 in a natural state.

Finally, as shown in FIG. 8, a lid 3 is placed on the upper side of the molding die 1 so as to be in close contact therewith, and the lid 3 is fixed by a clamp 2 and left to cure. In this case, foaming was completed in 20 minutes, and curing took 2 hours to demold. The reason for taking sufficient time for this curing is to eliminate tack on the surface and facilitate handling, and it is desirable that the time required for the above-mentioned manufacturing process is within 30 to 40 seconds for one mold.

The hardness of the resin A containing fibers of the present invention can be changed by the hardness and expansion ratio of the two-component urethane foaming agent 4, the density of the fibers 6, and the like. To increase the hardness of the resin A containing fibers of the present invention, either increase the density of the fibers 6 or decrease the expansion ratio of the two-component urethane foaming agent 4,
Increase the hardness of the 2-liquid urethane foaming agent 4 itself. Furthermore, in order to reduce the hardness of the resin A containing fibers of the present invention,
This is possible by taking the reverse method. In addition, the density of the fibers 6 and the selection of the two-component urethane foaming agent 4 have a great influence on the hardness change of the resin A containing fibers of the present invention.

When impregnating and molding with other resin, it is basically the same as urethane foaming, but when molding with solid, other resin is injected until the injection amount reaches the upper part of the fiber 6. However, if both 1st and 2nd liquids are high viscosity products, vacuum degassing is desirable. Further, even for low-viscosity products, if the density of the fiber becomes high, it is considered that air bubbles may be entrapped, so vacuum degassing is necessary. The entrainment and defoaming of air bubbles slightly change depending on the difference in fiber density and resin viscosity, so it is impossible to explain by taking an example.

Further, the injection amount of the foam is determined by selecting the expansion ratio, and in order to stabilize the expansion ratio, the molding die 1 must be manufactured in a closed type.
The injection speed must be within the pot life of the resin used. It is not necessary to use the closed type for solids, but the injection rate is the same.

Further, the curing method includes a heat curing type, a natural curing type, a moisture curing type and the like, and it is desirable to select it after thorough examination according to the purpose. For example, if it is necessary to finish the product in a short time, select the heat-curing type, and if sufficient time is not available and there is no heating furnace, select the natural-curing type. In this case, it goes without saying that the curing time varies depending on the type of resin used.

[0022]

INDUSTRIAL APPLICABILITY The resin A containing fibers of the present invention is soft and elastic at the time of molding a cleaning brush in the condenser cooling pipe, an abrasive for various machine parts, a strong cushioning material, a barrel abrasive, etc. By impregnating various fibers C such as synthetic fibers, natural fibers, and metal fibers into a synthetic resin B such as a foam or a solid having a property to form a sheet or a block, the synthetic resin B has softness and elasticity. Since it is better than the conventional synthetic rubber, the synthetic resin B on the cut surface of the outer circumference is pulled inward by the stress, and only the fibers C remain protruding on the cut surface of the outer circumference. The tear strength is further increased, the durability is extremely better than that of the conventional synthetic rubber, and the weight can be remarkably reduced.

Further, in the method for producing the resin A containing fibers of the present invention, the two-liquid mixing type low-viscosity two-liquid urethane foaming agent 4 in the molding die 1 having an appropriate shape and size is used by an appropriate number of nozzles such as a dispenser. After injecting an appropriate amount at 5, the target fiber 6 cut into a required shape is inserted from above onto the two-component urethane foaming agent 4, and then the target fiber 6 is applied to an appropriate pressing jig 7. And press the fiber 6 to an appropriate position where the two-component urethane foaming agent 4 is sufficiently impregnated, and then immediately remove the pressing jig 7 to remove the two-component urethane foaming agent 4 and the fiber 6 in a natural state. , And finally, the lid 3 is closely fixed to the upper side of the molding die 1 so as to be naturally cured, heat-cured and moisture-cured. By arbitrarily selecting the magnification and the density of the fiber 6, etc., The Wei-containing resin A can be easily and reliably manufactured to the required hardness.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state where a cleaning brush for cleaning the inside of a condenser cooling pipe of a condenser is formed of the resin containing fibers of the present invention.

FIG. 2 is a perspective view showing a state where the other cleaning brush of FIG. 1 is also molded.

FIG. 3 is a perspective view showing a state where the other cleaning brush of FIG. 1 is also molded.

FIG. 4 is a process drawing showing the method for producing a fiber-containing resin of the present invention, which is a cross-sectional view showing a step of injecting a two-component urethane foaming agent into a molding die.

5 is a sectional view showing a step of inserting fibers onto the two-component urethane foaming agent of FIG. 4. FIG.

FIG. 6 is a cross-sectional view showing a step of pressing the two-component urethane foaming agent and fibers of FIG.

7 is a cross-sectional view showing a process of releasing the two-component urethane foaming agent and fibers of FIG. 6 to a natural state.

8 is a cross-sectional view showing a standing process until the two-component urethane foaming agent and fibers in FIG. 7 are cured.

[Explanation of symbols]

 A Fiber-containing resin B Synthetic resin C Fiber D Cylinder E Groove F F Sphere 1 Mold 2 Clamp 3 Lid 4 2 Liquid urethane foaming agent 5 Nozzle 6 Fiber 7 Pressing jig

Claims (2)

(57) [Claims] 1. A fiber characterized by being formed into a sheet or a block by impregnating a synthetic resin such as a soft and elastic foam or solid with various fibers such as synthetic fiber, natural fiber and metal fiber. Filled resin. 2. A two-liquid mixing type low-viscosity two-component urethane foaming agent is injected into a molding die of an appropriate shape and size with an appropriate number of nozzles such as a dispenser, and the two-component urethane foaming agent After inserting the target fiber cut into the required shape from above, insert the target fiber into the appropriate position with a suitable pressing jig until the fiber is sufficiently impregnated with the two-component urethane foaming agent. Press, then immediately remove the pressing jig to release the two-component urethane foaming agent and fibers to the natural state, and finally, fix the lid tightly on the upper side of the mold to allow natural curing and heating. A method for producing a resin containing fibers, which comprises curing and moisture curing.