KR820001591B1 - Adhesive bonding process using foam carrier containing a curable resin - Google Patents

Abstract

A spongy carrier, such as a rubbery polyurethane foam, is impregnated with a room temp. curing adhesive such as a polyurethane, polyester, or epoxy resin, cooled rapidly to prevent premature curing of the adhesive, placed between materials to be bonded together, and warmed to room temp. to cure the adhesive. The method is esp. useful for bonding blocks of polyurethane foam insulation to each other and to the metal walls of ships used for transporting natural gas as liq.

Description

Bonding method using porous material containing curable resin

1 is a schematic diagram illustrating a process of curing a resin by incorporating a liquid thermosetting resin adhesive into a porous material and then quenching to prevent polymerization of the resin.

FIG. 2 illustrates bonding a fiber reinforced reinforced polyurethane block using an adhesive element of porous material according to the present invention.

3 is a view illustrating bonding a fiber reinforced polyurethane foam to a plywood using a binder made of a porous material according to the present invention.

FIG. 4 illustrates bonding a fiber reinforced polyurethane foam to steel using an adhesive of porous material according to the present invention.

5 is a view showing an example in which a quenched plate-shaped resin-impregnated polyurethane foam is applied to the inner surface of a steel body of a liquefied natural sewage (LNG) marine transport ship.

FIG. 6 is a view showing an example of thermally insulating a polyurethane foam reinforced with fibers using the plate-shaped resin impregnated foam illustrated in FIG.

The present invention relates to a bonding method using a porous material bonded to the surface of a resin wood and metal parts, in particular containing a curable resin.

A fundamental problem in handling liquid adhesives that have been cured at ambient temperature is that resin adhesives can be mixed with a curing agent, ie, a catalyst, quickly applied onto the surface to be glued, and then bonded to each other before the adhesive is cured or after a working time. It must be. Scrapers, spatulas, spray nozzles, or similar devices can be used to spread the adhesive, resulting in uneven adhesion of the adhesive and the application of liquid adhesive to areas that do not accept adhesive such as flooring. There is a pedan that stains. The liquid adhesive for room temperature curing currently used should be mixed with powder such as cabosil inorganic powder to prevent dripping or migration when the thickness is over 0.015 inch (0.038 cm). .

Since the adhesive mixing device used for constitutional bonding work should be adjacent to the bonding work place in the case of liquefied natural sesame transport ship, etc., it is necessary to clean the device and when the entry is spilled, etc. Causes urea contamination

In the past, various composite materials or thermosetting resin laminates have been manufactured using plates having a pore structure and containing a thermosetting resin. As an example, an excess of resin is adhered to a central element of a hard foam having a closed pore structure and a reinforcement layer having an elastic opening structure is adhered to a sandwich structure in a mold. It is also made into a composite structure by compressing the out of the foam having a pore structure and heat-curing the resin so that the high-strength reinforcement is bonded to the central element having a hard closed pore structure. However, this system is not applicable to bonding large amounts of reinforcement foam at ambient temperatures. For example, block-shaped fiber reinforced foam insulation can be bonded to each other to form a foam insulation layer of a liquefied natural sesame transport vessel at low temperatures, or it cannot be used to bond such foamed foam insulation to the inside of a ship body. Another example of the conventional method is to perform a fiber reinforcement layer on at least one side of a plate-like material having a pore structure and a thermosetting resin, and compress the plate-shaped foam to extrude resin into the fiber reinforcement layer. Another method is to harden the resin in the plate material, put it in a mold, and thermally harden it at high temperature to reinforce the layer.

The primary object of the present invention is to cure at room temperature and to be cured at low temperatures, even when applied between the surfaces of the adherend and not cured at room temperature without excess resin leaking out to form a single adhesive. The thermosetting resin adhesive can be used to improve the bonding process.

In the bonding process according to the present invention, the impregnation of an appropriate amount of the porous polymer with a liquid polymer that can be cured at ambient temperature is rapidly lowered so that the resin is cured. By inserting the resin impregnated porous material to the ambient temperature again, the excess resin system is compressed from the resin impregnated porous material so that the resin system adheres to the surface of the adjacent adherend and cures. The porous material is such that a line of contact is formed between the adhesives.

In addition, the process according to the present invention relates to the manufacture of a material impregnated with an adhesive for use in the bonding process, that is, an appropriate amount of liquid that can be cured at ambient temperature on both surfaces of an elastic plate-like polyurethane foam having a pore structure. After continuous spraying of the thermosetting resin (polyurethane, polyester and epoxy resin as the liquid resin), a series of continuous rollers were used to continuously contact the treated surface to impregnate the liquid resin in the plate-like polyurethane foam, The quench is then quenched as it passes through the quenching chamber to prevent hardening of the resin and to prevent the resin from curing even when stored in a cold storage container at a sufficiently low temperature. A portion of the quenched plate-like impregnation material is placed between the surfaces of the adherend. Insert into the ambient temperature and within the foam If the liquid phase is again made to cure sikimeuroseo excess resin is bonded between without being pressed out of the plate-like foamed material it is also impregnated with the foaming material and the blood of the adhesive plate at ambient temperature will be a bonding line formed therebetween.

If adhesive bonding is required, the quenched resin-impregnated porous material or plate containing uncured resin is cut into the required shape or size after quenching and then using fiber reinforced polyurethane foam insulation and plywood, concrete or steel. Place the resin impregnated plate directly to or between the surfaces of the adherend, such as the walls of the liquefied natural sesame transport vessel, and raise the temperature of the resin impregnated plate to ambient temperature to make the resin liquid and harden the plate to a solid state. It can also be glued. When only contact pressure or light bonding pressure is needed, it is about 10 psi, and when it is brought into contact with the bonding surface of the bonded object by applying light bonding pressure, it contains a flexible resin containing a temperature rising to the ambient temperature. ), The plate-shaped foam is compressed and the resin finally hardens at ambient temperature to form a solid bond line.

Foams having a porous pore structure used in the process of the present invention may contain a liquid resin adhesive without dropping or transfer phenomenon, and also from 0.25 cm (0.5 cm) or more from 0.005 inches (0.0127 cm) or less Although it can form the thickness of the adhesive line to the thickness is generally in the range of 0.005 inches.

Broadly speaking, the bonding process according to the present invention impregnates the porous material with an appropriate amount of polymerizable liquid resin that can be cured at ambient temperature so that the resin system does not harden to be cured and is maintained at this temperature for a certain period of time. It is inserted between the complex to raise the temperature to almost ambient temperature to harden the resin system and to join the adjacent surface of the glued material, thereby reducing the thickness of the porous material containing the cured resin that does not leak from the resin impregnation plate. It relates to a process for manufacturing a thing having the adhesive line adjusted in the.

The present invention mixes a liquid resin adhesive and a curing agent to enable uniform and accurate dispersion up to the inside of a porous material having a pore structure, that is, a plate-shaped polyurethane foam.

When stored in a low temperature range of about 0 ° F-40 ° F (-18 ° C about 4 ° C) and frozen, the resin-impregnated foam plate is transferred to the bonding area for adhesion. It was made. When the temperature rises to about 20 ° C, the adhesive in the impregnating plate becomes liquid again and the curing proceeds. At this time, the service life may be somewhat shortened during the operation, and the same curing time as the initial mixture of the same resin and the curing agent is cured. To harden at ambient temperature.

By cutting the plate-like porous adhesive into the correct shape, it can be adhered to the surface of this part without dropping or contamination of the adhesive liquid to the part where cleanliness is required. Porous adhesive according to the present invention can be mutually bonded between plastic, wood or metal.

In the case of bonding work in shipyard using porous adhesive plate, in particular, plate-shaped polyurethane foam having an open structure impregnated with resin, it is an important application example according to the present invention. There is no need to use mineral fillers to control this, and because the resin viscosity range that porous materials can embrace is wide, the liquid adhesive when used in shipyards does not cause any problems.

In addition, the method according to the present invention allows the resin-impregnated porous material according to the present invention to be used without supervising or training the people handling the conveyor and the adhesive mixing machine with the spray nozzles at various different bonding sites in the ship. Not only can it be manufactured in a single, remote location, but it can also carry quenched resin impregnated porous materials to specific bonding sites in the vessel. Moreover, if the porous plate filled with adhesive on the various elements to be bonded inside the vessel, that is, the opening plate of the opening structure, is installed at the correct position and cleaned, it can give a great construction reliability with low cost.

Accordingly, the present invention relates to the construction of room temperature curable adhesives required to bond insulation, and more particularly to the insulation of large vessels transporting low temperature fluids (especially liquefied natural sesame) using fiber reinforced polyurethane insulation.

The present invention will be described in detail with reference to the accompanying drawings. In FIG. 1, the porous material 10 is supplied from the raw material storage roll 12 to enter the conveyor 16 through the guide roll 14. 1/8 inch (0.315 cm) and 1/4 inch (0.63 cm) should be used and have an opening structure to accommodate the resin. The plate material having such a pore structure should be compressible, flexible, and wettable by liquid resin, and it should be a continuous structure in the open state so that the liquid resin can pass through the plate material without obstacles.

Porous material or plates should not be reacted with the thermosetting resin constituting the plate. In practice, the use of tubular foam having a pore structure uses plate-like polyurethane with elasticity, particularly as a pore structure. Polyurethanes made of polyester and polyether are used, and polyether type is particularly used because it can be secured.

Instead of a flexible polyurethane foam having a pore structure, an elastic body having other pore structures such as cotton cloth, glass fiber or sponge rubber, and latex cellulose foam may be used.

The present invention also relates to the use of an elastic polyurethane foam sheet having a pore structure for resin impregnation.

A liquid thermosetting resin on the underside of the plate using a disperser 18 prior to passing the plate-shaped polyurethane foam 18 with the opening structure under the idle roll 14, 10. Spray or disperse. The liquid thermosetting resin that can be appropriately used in the process according to the present invention can be cured at room temperature (about 20 ° C). Among these are liquid polyurethane liquid polyesters and liquid epoxy resins. Liquid melamine and silicone resins may also be used.

The thermosetting resin is converted into a cured form by crosslinking with an appropriate room temperature curing agent, with or without adding a curing catalyst or accelerator. The room temperature hardening | curing agent used suitably for the resin shown above uses a well-known thing. The polyurethane resin adhesive is produced by reacting isocyanates such as diphenylmethane-4,4'-diisocyanade (MIDI) with a polyol. Particularly good among epoxy resins are liquid glycidyl polyethers of polyhydric phenols such as diglycidyl ether of bisphenol A (BPA), which are made by reacting epichlorohydrin and BAP in the presence of caustic soda. What is good as polyester is unsaturated polyester known by the lamination process.

Suitable as room temperature curing agent for liquid polyurethanes are non-chlorinated amines. Suitable epoxies as room temperature curing agents are aliphatic amines, in particular aliphatic polyamines or aliphatic polyamides, and methyl ethyl ketone peroxide for polyesters.

As a hardening | curing agent for epoxy resins and a polyester resin, a well-known thing is used.

The bottom surface of the polyurethane plate material 10 is sprayed with a liquid resin adhesive, and then passed through the bottom of the rool 14, which is sprayed on the top surface as the same liquid adhesive using the disperser 20. The plate-like material thus treated is moved along the conveyor 16 to be brought into contact with the lower surface of the compression roller 24 to be passed through. The roller 24 is an open grid or pleated roller 25 which penetrates the liquid resin into the elastic plate-like material 10 while moving.

Therefore, the elastic sheet-like material 10 is locally compressed and then relaxed to absorb the resin. However, the roll moves the resin axially from the position where the resin on the plate-like material 10 is deposited. It also prevents the resin from accumulating locally and allows the resin to penetrate uniformly into the plate material 10. The amount of liquid resin used and the amount of resin penetrated into the plate-shaped foam 10 are only about the degree of impregnation of the plate-like material and partly impregnation with the resin, and not all pores of the plate-shaped foam are filled with resin, but a large number of openings. This plate-like foam remains in the center adjacent to it. Porous material or plate-like polyurethane foam 10 is impregnated with a liquid resin system at room temperature for a few seconds, and then passes through a roll 26 to be introduced into the quenching chamber 28, where the resin-impregnated plate material 10 ' Rapid cooling at low temperatures prevents the resin from polymerizing or curing. The quenching process of the thermosetting liquid polyurethane resin may be performed at a temperature of about 40 ° F (+ 4 ° C.).

The final plate containing the quenched resin is wound on the roll 30 in the mobile freezer storage container 32 to store the roll 33 made of the plate-like material 10 'impregnated with the quenched resin and suitable bonding process. Use at

Therefore, using a continuous process, the liquid resin system is impregnated in a plate-like polyurethane foam, then passed through the quench chamber and wound and stored in the roll phase. If the plate-like material impregnated with resin is instantaneously quenched and stored frozen, step B of the resin adhesive is unnecessary and during the quenching and freezing storage, the resin inevitably remains in an unreacted state as in a liquid phase. As a result, the quenched resin impregnation can be stored at 40 ° F (+ 4 ° C.) for up to two days, but at lower temperatures for a long time, for example, at 0 ° F (−18 ° C.) for four weeks. By controlling the amount of the liquid resin adhesive penetrated into the plate-shaped polyurethane foam 10 of the opening structure, the adhesive can be bonded by preventing the excess resin from being extruded out of the bonding process and penetrating into the adherend.

Thus, as stated, the porous material or plate-like foam 10 is partially penetrated into the resin. The amount of liquid resin applied to the plate-shaped foam is adjusted by measuring a specified amount of the liquid resin with respect to the speed of the plate-shaped foam moving along the conveyor 16 using a suitable known measuring device through the disperser 18,20. Can be. From this point of view, the amount of liquid resin adhesive penetrated into the porous material or the plated polyurethane foam generally varies depending on the property of the adherend, especially when it is necessary to perform strong adhesion at low temperatures.

For example, when the fiber-reinforced polyurethane foam block is bonded to plywood, a thin adhesive line is formed, so the amount of adhesive per 1 ft ² is small. This is when the fiber-reinforced polyurethane foam block is bonded to a metal such as a steel ship body. In the case of steel bodies, the surface is irregular due to welding spots or boards in adhesive lines.

When used for adhesive purposes according to the present invention, a portion of the quenched plate material (10 ') impregnated with an uncured resin is cut into a required size or shape, and the surface of the adherend, such as a fiber reinforced polyurethane foam block, plywood or hull. Construct between steel blocks such as these blocks. When the quenched resin impregnated plate is used for the adherend, the impregnated resin gradually becomes liquid as the plate temperature rises to room temperature, and whether or not pressurized, the resin is cured at room temperature, so that a strong resin bond is formed between adjacent adherend surfaces. Will be created. During the bonding process, the plate-shaped foam impregnated with resin can be compressed under pressure of about 10-12 psi to compress the thickness of about 0.25 inch (0.635 cm) to about 0.015 inch (0.038 cm) while the plate material is partially impregnated with resin. Because it is made, resin does not come out. The bond formed after curing is due to the solid resin. At this time, about 3 to 4% by weight of the bonded foam is formed. Depending on the nature of the resin, the physical properties of the resin bond line may vary. When the polyurethane resin is used, the property of the cured resin bond line becomes like a hardened rubber. When the epoxy resin is used, the bond line becomes more firm.

The present invention uses a quenched resin impregnated porous material or a porous polyurethane foam plate material (10 '), and in particular, a porous insulating block in a large scale liquefied sesame transport line, which is bonded to each other or adhered to wood and metal surfaces. It is used to

Therefore, the second shows an example of the present invention by inserting the quenched resin impregnated tubular material (10 ') to the required size between the fiber-reinforced foam insulation block 34 is bonded. The polyurethane foam block 34 is a closed polyurethane foam formed by reinforcing fibers of X, Y and Z (38, 40 and 42) in the polyurethane foam body 36 in the longitudinal, transverse and depth directions, respectively. It is a matrix.

The ends of these fibers should be exposed, especially in bundles of fibers, which facilitate the adhesion of the reinforced polyurethane blocks to each other or to other structural elements.

The fiber is preferably a glass fiber for reinforcement, and these blocks will be referred to as 3-D (three-dimensional three-dimen sional) foam blocks.

Insert the quenched resin impregnated polyurethane adhesive plate 10 'between the 3-D foam insulation block 34 and raise the temperature of the adhesive plate 10' in the porous material to the load. After the resin is made into a liquid again and the resin is cured at room temperature for a short time, the polyurethane block 34 is bonded through the adhesive line 10a. In order to increase the adhesive strength between the polyurethane blocks 34, a fiber such as 42 protruding from the surface of the 3-D foam insulation block may be formed. When contact pressure is applied between the blocks 34 or about 10 to 12 psi, the adhesive may be applied even if a vacuum pressure is applied.

As stated, the plate-shaped foam 10 of the opening structure according to the present invention functions as a carrier of the resin adhesive.

When the adhesive is cured by joining the surface of the polyurethane foam block 34, the plate carrier 10 becomes part of the final bond line 10a between the blocks 34, but cures the resin for practical purposes. When the adhesive line is generated, the plate-shaped carrier 10 loses its previous action.

정도에 불과한 극히 적은 부분에 불과하다. 진술한 바와 같이 발포체로 된 운반체 또는 개공구조의 플리우레탄 판상물질(10)속에 침투시킨 액산 수지량은 충분하여 10-12psi정도의 적당한 접점압력만으로서도 접착이 가능하기 때문에 수지함침판상물질(10')으로 부터 과잉의 수지가 압출되어 나와서 폐공구조를 가진 플리우레탄 발포체블록(34)중으로 들어가지 않는다.Therefore, the carrier made of urethane foam is about the total weight of the adhesive line 10a.

It is only a very small part. As stated above, the amount of the liquid acid resin penetrated into the foamed carrier or the opening of the polyurethane plate-like material 10 of the opening structure is sufficient, so that the adhesion can be performed only by a suitable contact pressure of about 10-12 psi. Excess resin is extruded from and does not enter into the polyurethane foam block 34 having a closed hole structure.

3 illustrates another example of the present invention, in which a 3-D polyurethane foam block 34 having a closed pore structure is adhered to the plywood block 44 using a porous material or a resin-impregnated polyurethane foam plate 10 '.

In the example of FIG. 4, the 3-D foam insulation 34 is bonded to the steel plate 46 using a plate-shaped resin impregnated polyurethane foam 10 ', that is, the 3-D foam insulation is liquefied natural sesame. It is bonded to the steel body of the ranker (tanker). In the example of FIG. 3 and FIG. 4, when attaching the 3-D foam block 34 to the plywood block 44 and attaching the 3-D foam block material block 34 to the steel plate 46, the example of FIG. As described above, the same bonding method is used. Referring to FIG. 5, the winding 33 of the quenched resin impregnated plate 10 'is liquefied in bonding the 3-D polyurethane foam insulation block or board 34 to the inner steel surface of the natural sesame ranker. It is applied directly to the working part in the dock 50 of natural sesame tank.

The resin impregnated plate (10) was quenched on the vertical inner surface (54) of the hull using a clip (not illustrated) while unwinding the winding of the resin impregnated plate (33) standing on the scaffold (52). Stick '). When the plate 10 'is unwound, it is released on the top row of the 3-D polyurethane block 34 already bonded to the inner surface 54 of the hull according to the process according to the present invention.

The upper edge 56 of the top end of the 3-D foam block 34 previously bonded to the hull wall 54 with a similar winding 33 'of a quenched resin impregnation plate 10' having a desired width. Loosen on top. (See Figure 6.)

As shown in FIG. 6, immediately after the quenched resin impregnated plates 10 'and 10'a as described above, a 3-D polyurethane foam insulation 34' similar to 34 was previously implemented. Apply the same corner construction on the plate-shaped resin impregnated foam 10'a bonded to the upper edge 56 of the foam block 34, and also perpendicular to the resin impregnated plate 10 'fixed to the dock wall. do. Resin impregnated plate 10 '(10'a) which was quenched by bonding the foam block 34' to the resin impregnated plates 10 'and 10'a by applying light contact pressure or vacuum pressure at about 10 psi for a predetermined time. The foam block 34 'adheres to the upper surface 56 of the lower row of the foam insulation block 34 and the inner surface of the hull by raising the temperature of the sheet to room temperature and curing the resin in the multiple layers at about room temperature. To be.

In the above-described method, the 3-D polyurethane foam insulation block is further formed in the hull to form a vertical column, thereby completely forming a layer of 3-D polyurethane foam insulation on the hull.

As stated, the amount of resin adhesive used depends on the properties of the adhesive. Therefore, when the surface of 3-D polyurethane foam is bonded to each other to create a 0.1 inch (0.25 cm) thick adhesive line that is tough even at low temperatures, the surface area of the liquid resin adhesive is used. Use 300 g per 1 ft ² .

To bond the 3-D polyurethane foam to the plywood to form a 0.015 inch (0.038 cm) thick adhesive line, 45 g of a liquid resin adhesive per 1 ft ² is used. When bonding 3-D polyurethane foam blocks to steel, 150 g of liquid resin per 1 ft ² is used to create a 0.050 inch (0.127 cm) thick adhesive line. It can be seen that various kinds of objects can be bonded according to the present invention as illustrated in FIGS. 2 to 4.

For example, when bonding wood to each other or steel to each other, the principles and methods of the present invention are used. Furthermore, the method described in FIG. 1 and illustrated in FIG. 1 may be performed by spraying liquid adhesive on both sides of the plate when bonding to the liquid adhesive-opening plate-like polyurethane foam 10. I) or other suitable method may be used to apply liquid resin adhesive to the plate 10 so that the liquid resin penetrates into the plate. Therefore, according to the present invention, the amount of the liquid adhesive agent per 1 ft ² of the adhesive line is appropriately deposited and deposited on the flexible foam plate of the open structure, so that the adhesive penetrates into the flexible foam, thereby obtaining a uniform thickness necessary for low temperature insulation adhesion. To form an adhesive.

The time to work by infiltrating the catalyzed room temperature curing adhesive into the flexible foam sheet can be extended as necessary, i.e. the temperature of the quenched plate, which has been quenched and transferred to the surface to which the quenched plate is to be bonded. Just raise the temperature to room temperature so that the adhesion can be achieved. Generally, about 0.25 inch (0.63 cm) thickness of resin can penetrate into the porous cloud body or the flexible foam plate of the open structure. Exceeding this will impair the quenching process.

As stated, the present invention allows the surface of an object to be bonded in a relatively simple and effective manner, and in particular, it can be carried out by curing at room temperature in order to bond the foam insulation necessary for the interior of a large, weakened natural sesame container. have. Therefore, the minimum cost and personnel can be avoided, and the cleaning operation by using the liquid resin adhesive can be avoided. Also, an appropriate amount of room temperature-curable liquid thermosetting resin is used to impregnate the porous porous carrier in the open structure and quench it for several seconds. After use, the plate-shaped resin-impregnated porous carrier that was quenched during use was cut into a suitable shape and size, and placed between an object such as a polyurethane foam insulation block or between a hull of a liquefied natural sesame tanker and a polyurethane foam insulation block to apply pressure. Or bonding without adding, the temperature of the adhesive is raised to room temperature to become a liquid adhesive, hardening without applying a large pressure to the adjacent surface of the object and without excess adhesive is squeezed to increase the strength, especially at low temperatures By serving The St. carrier or foam plates, which will be created as part achieved a complete bond line.

Claims (1)

Impregnating the porous carrier with an appropriate amount of liquid polymerizable resin that can be cured at ambient temperature, and rapidly impregnating the temperature of the resin-impregnated porous carrier so that the resin system does not cure and is kept in a cooled state for a period of time, and at least a part of the resin After inserting the impregnated porous carrier between the adherends, the temperature is raised to ambient temperature so that the resin system is cured and adhered to the adjacent surface of the adherend and substantially no excess resin is extruded from the resin-impregnated porous carriers. Bonding method using a porous material containing a curable resin to form an adhesive line between the adhesives due to the cured resin.

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