JP2010058394A - Steel plate reinforcing sheet, and method for manufacturing the same - Google Patents

Abstract

An object of the present invention is to prevent the strength of a heated thermosetting resin layer from decreasing and to ensure excellent workability while achieving excellent processability and handleability, which can be obtained by a simple process. To provide a steel plate reinforcing sheet and a manufacturing method thereof.
A constraining layer 2 is prepared, and a resin composition containing a thermosetting resin is laminated on the surface of the constraining layer 2 so as to form a corrugated streak space 4 penetrating in the thickness direction. Thus, the steel plate reinforcing sheet 1 is obtained by forming the thermosetting resin layer 3 made of the resin composition adjacent to each other with the streak-like space 4 interposed therebetween.
[Selection] Figure 1

Description

  The present invention relates to a steel plate reinforcing sheet and a manufacturing method thereof, and more particularly to a steel plate reinforcing sheet for reinforcing steel plates used in various industrial products and a manufacturing method thereof.

Conventionally, it is known that a reinforcing sheet is used to reinforce steel plates used in various industrial products. In such a reinforcing sheet, a thermosetting resin layer made of an epoxy resin or a rubber resin is laminated on a reinforcing base material layer such as a glass cloth or an aluminum foil, and the thermosetting resin layer is attached to a steel plate. After wearing, the steel sheet is reinforced by curing it by heating.
However, when a single reinforcing sheet having a relatively large area is attached to a steel plate and heated and cured, the difference in linear expansion coefficient between the heated thermosetting resin layer and the reinforcing base material layer, The heated cured resin layer and the reinforcing base material layer receive stress from each other due to shrinkage due to cooling. Therefore, there is a problem that a crack due to stress concentration occurs in the central portion of the heated thermosetting resin layer, or the steel sheet is distorted.

Therefore, in order to prevent the above problems, an adhesive sheet in which an uncured layer made of a melamine resin is formed on the upper surface of the glass cloth and a slit penetrating the glass cloth is formed (for example, see Patent Document 1). .) The adhesive sheet of Patent Document 1 is obtained by laminating an uncured layer on a glass cloth and then perforating with a cutting blade from the glass cloth to the middle of the uncured layer in the thickness direction to form a cut.
Japanese Patent Laid-Open No. 4-80279

However, in the adhesive sheet proposed in Patent Document 1, since a slit that penetrates the thickness direction is formed in the glass cloth, the glass cloth can sufficiently support the cured layer in which the uncured layer is cured. I can't. Therefore, the reinforcement property with respect to a steel plate falls.
Further, in the conventional reinforcing sheet including the adhesive sheet of Patent Document 1, since one thermosetting resin layer is adhered to a steel sheet with a relatively large area, the upper surface of the thermosetting resin layer and the lower surface of the steel sheet In some cases, unintended bubbles (voids) may be formed. In that case, since the contact area between the upper surface of the thermosetting resin layer and the lower surface of the steel sheet decreases due to the formation of bubbles, there is a problem that the reinforcing sheet falls off the steel sheet during heating and curing.

Moreover, in order to form a slit in the adhesive sheet of patent document 1, since a slit is formed in the glass cloth by which the uncured layer was already laminated, workability will fall. Furthermore, after forming the uncured layer, it is necessary to separately form slits with cutting teeth.
In addition, a portion of the uncured layer may ooze out from the glass cloth slits onto the lower surface of the glass cloth, and when the adhesive sheet is stored, the glass cloths adhere to each other through the uncured layer oozed out of the slits. Therefore, there is a problem that the handleability is low.

  The object of the present invention is to prevent the strength of the heated thermosetting resin layer from being lowered and to achieve excellent workability and handleability while ensuring excellent reinforcing properties. It is in providing the steel plate reinforcement sheet and its manufacturing method which are obtained.

In order to achieve the above object, a steel sheet reinforcing sheet of the present invention includes a constraining layer, and a thermosetting resin layer laminated on the constraining layer and disposed adjacent to each other with a wavy space penetrating in the thickness direction. It is characterized by having.
In the steel plate reinforcing sheet of the present invention, it is preferable that a plurality of the spaces are arranged at intervals in the adjacent direction, and the wave shapes of the spaces have substantially the same phase.

In the steel sheet reinforcing sheet of the present invention, the thermosetting resin layer extends in a crossing direction intersecting the adjacent direction, and the adjacent direction length of the thermosetting resin layer is substantially the same over the crossing direction. It is preferable that it is formed in a wave shape.
Moreover, in the steel plate reinforcement sheet of this invention, it is suitable that ratio of the adjacent direction length of the said space with respect to the thickness of the said thermosetting resin layer is 0.2-15.

Moreover, in the steel plate reinforcement sheet of this invention, it is suitable for the said thermosetting resin layer to contain the heating foaming agent which foams by heating.
Further, the steel sheet reinforcing sheet of the present invention includes a constraining layer and a thermosetting resin layer laminated on the constraining layer, the constraining layer is prepared, and a space penetrating the thickness direction on the surface of the constraining layer. It is characterized by being obtained by forming a thermosetting resin layer so as to be adjacent to each other with a gap therebetween.

Further, the method for producing a steel sheet reinforcing sheet of the present invention includes a step of preparing a constraining layer and a resin composition containing a thermosetting resin so that a space penetrating the thickness direction is formed. And a step of forming thermosetting resin layers made of the resin composition adjacent to each other across the space by being laminated on the surface.
Moreover, in the manufacturing method of the steel plate reinforcement sheet of this invention, it is suitable that the said space is a wave shape.

In the method for manufacturing a steel sheet reinforcing sheet of the present invention, it is preferable that a plurality of the spaces are arranged at intervals in the adjacent direction, and the wave shapes of the spaces have substantially the same phase.
In the method for manufacturing a steel sheet reinforcing sheet according to the present invention, the thermosetting resin layer extends in a crossing direction intersecting the adjacent direction, and the adjacent direction length of the thermosetting resin layer is substantially over the crossing direction. It is preferable that they are formed in the same wave shape.

  In the steel plate reinforcing sheet of the present invention obtained by the method for manufacturing a steel plate reinforcing sheet of the present invention, the space is formed not in the constraining layer but in the thermosetting resin layer. Therefore, with such a constraining layer, the thermosetting resin layer can be reliably constrained to improve the strength of the steel plate reinforcing sheet, and thereby the steel plate can be reliably reinforced. Furthermore, adhesion between the constraining layers can be prevented, and excellent handleability can be realized.

Moreover, in this steel plate reinforcing sheet, even if the heated thermosetting resin layer and the constraining layer are subjected to stress by heating, the stress can be dispersed in the space. Therefore, it is possible to prevent the heated thermosetting resin layer from being damaged and the steel plate from being deformed.
In particular, in the steel sheet reinforcing sheet of the present invention, since the space is corrugated, stress applied from various directions can be dispersed along the corrugated space.

Furthermore, in this steel plate reinforcing sheet, even if unintended bubbles (voids) are formed between the constraining layer and the thermosetting resin layer, the bubbles can be released into the space. Therefore, it is possible to prevent the steel sheet reinforcing sheet from dropping off or the reinforcing property from being lowered due to unintended bubbles (voids).
Moreover, in this manufacturing method of a steel plate reinforcement sheet, a resin composition is laminated | stacked so that space may be formed, and a thermosetting resin layer is formed. Therefore, after forming the thermosetting resin layer, the trouble of forming a separate space can be eliminated. Moreover, since the thermosetting resin layer is formed in advance so as to ensure the space, the space can be easily and reliably formed. Therefore, it is a simple method, and excellent workability can be ensured while reducing the number of manufacturing steps.

FIG. 1 is a plan view of an embodiment of a steel plate reinforcing sheet according to the present invention, and FIG. 2 is a process diagram showing a method for manufacturing the steel plate reinforcing sheet shown in FIG. 1, corresponding to the line BB in FIG. FIG. 3 is a cross-sectional view, and FIG. 3 is an explanatory view showing a reinforcing method for reinforcing the steel plate by placing the steel plate reinforcing sheet shown in FIG. 1 on the steel plate and heating the thermosetting resin layer.
In FIG. 1 and FIG. 2 (b), the steel sheet reinforcing sheet 1 includes a constraining layer 2 and a thermosetting resin layer 3 laminated on the constraining layer 2.

  The constraining layer 2 constrains the thermosetting resin layer 3 to retain the shape of the heat-cured thermosetting resin layer 3 (a foam-cured layer 5 described later, see FIG. 3B), and It is a support layer that imparts toughness to the foamed cured layer 5 to improve strength. The constraining layer 2 has a flat sheet shape and is formed of a material that can be closely integrated with the heated thermosetting resin layer 3 (foamed cured layer 5). Examples of such materials include glass cloth, metal foil, carbon fiber, synthetic resin nonwoven fabric, and woven fabric.

  The glass cloth is made of glass fiber and a known glass cloth is used. The glass cloth includes a resin-impregnated glass cloth. As the resin-impregnated glass cloth, the above-described glass cloth is impregnated with a synthetic resin such as a thermosetting resin or a thermoplastic resin, and a known one is used. In addition, as such a thermosetting resin, an epoxy resin, a urethane resin, a melamine resin, a phenol resin etc. are mentioned, for example. Examples of such thermoplastic resins include vinyl acetate resins, ethylene / vinyl acetate copolymers (EVA), vinyl chloride resins, EVA / vinyl chloride resin copolymers, and the like.

Examples of the metal foil include known metal foils such as aluminum foil, stainless steel foil, and steel foil.
Of these, glass cloth is preferable in view of strength and cost.
The size (size) of the constraining layer 2 is appropriately selected according to the application and purpose. For example, the length in the adjacent direction X (left and right direction in FIG. 1) described later is, for example, 50 to 200 mm, which will be described later. The length in the orthogonal direction Y (vertical direction in FIG. 1) is, for example, 100 to 600 mm.

The thickness of the constraining layer 2 is, for example, 20 to 2000 μm, preferably 100 to 1000 μm. In particular, when the constraining layer 2 is a glass cloth, the thickness is preferably 300 μm or less. When 2 is metal foil, it is preferably 100 μm or less.
The thermosetting resin layer 3 is formed in a pattern in which a streaky space 4 as a space is secured on the surface of the constraining layer 2. Specifically, the thermosetting resin layer 3 is formed in a pattern that is arranged adjacent to each other with a streak-like space 4 penetrating in the stacking direction (hereinafter referred to as the thickness direction).

In the thermosetting resin layer 3, as shown in FIG. 1, the streak spaces 4 extend along an orthogonal direction (vertical direction in FIG. 1) Y orthogonal to the adjacent direction X (horizontal direction in FIG. 1). A plurality of lines are arranged in the direction X with an interval W1 therebetween.
Each streak-like space 4 is formed so as to meander in a wave shape whose width W1 (length in the adjacent direction X) is the same in the orthogonal direction Y. Further, each streak space 4 is continuously formed in the orthogonal direction Y from the one end to the other end of the thermosetting resin layer 3.

Each streak space 4 has a wave shape in plan view (when projected in the thickness direction). Specifically, each streaky space 4 is formed in a sine wave (sinusoidal) wave shape in plan view. That is, each mountain is arranged (zigzag) so that both sides of the adjacent direction X in the reference line S (virtual line) along the orthogonal direction Y are alternately sandwiched (staggered).
In addition, the wave shape of each streaky space 4 has the same amplitude A, the same wavelength λ, and the same phase.

Thereby, the space | interval W2 in the adjacent direction X between each streaky space 4, ie, the width W2 (length of the adjacent direction X) of each thermosetting resin layer 3, is the same over the orthogonal direction Y.
That is, each thermosetting resin layer 3 is formed by being partitioned into each streaky space 4, and more specifically, each streaky space 4 has the same amplitude A, the same wavelength λ, and the same phase as each of the streaky spaces 4 described above. It is formed into a shape. Further, each thermosetting resin layer 3 is formed so as to meander in a wave shape whose width (length in the adjacent direction X) W2 is the same in the orthogonal direction Y.

  The dimension of the thermosetting resin layer 3 is appropriately selected according to its use and purpose, and the thickness T (see FIG. 2B) is, for example, 0.5 to 3 mm, preferably 0.6 to 2. 5 mm, and the width (length in the adjacent direction X) W2 of each thermosetting resin layer 3 is, for example, 5 to 150 mm, preferably 10 to 100 mm. Further, the interval W1 in the adjacent direction X between the thermosetting resin layers 3, that is, the width W1 of each streaky space 4 (length in the adjacent direction X) is, for example, 0.1 to 45 mm, preferably 0. 0.1 to 15 mm, more preferably 0.2 to 10 mm.

  Thus, the ratio of the spacing W1 in the adjacent direction X between the thermosetting resin layers 3 to the thickness T of the thermosetting resin layer 3, that is, the width (length in the adjacent direction X) W1 of each streaky space 4 (W1 / T) is, for example, 0.2 to 15, preferably 0.5 to 12. When the ratio is less than the above range, the width W1 of each streaky space 4 becomes excessively narrow, and the streaky space 4 is not secured when the thermosetting resin layer 3 expands in the heating and curing steps. There is. Moreover, when the said ratio exceeds the said range, the width W1 of each stripe-like space 4 will become large too much, and the steel plate 6 (after-mentioned) may not fully be reinforced.

  The amplitude A and the wavelength λ of the thermosetting resin layer 3 and the streaky space 4 are appropriately selected depending on the application and purpose. In the relationship between the amplitude A and the wavelength λ, the wavelength λ is the amplitude A, for example, etc. Double to 10 times, preferably 1.5 to 8 times. Specifically, the amplitude A of the thermosetting resin layer 3 and the streaky space 4 is, for example, 5 to 100 mm, preferably 10 to 50 mm, and the wavelength λ is, for example, 5 to 1000 mm, preferably 15 ~ 400 mm.

And the thermosetting resin layer 3 is formed from the resin composition containing a thermosetting resin, for example.
The thermosetting resin is not particularly limited, and examples thereof include an epoxy resin, a synthetic rubber (rubber-based resin), or a mixture of an epoxy resin and a synthetic rubber.
Examples of the epoxy resin include bisphenol type epoxy resins (for example, bisphenol A type epoxy resins, bisphenol F type epoxy resins, bisphenol S type epoxy resins, water-added bisphenol A type epoxy resins, dimer acid-modified bisphenol A type epoxy resins, etc.) , Aromatic epoxy resins such as novolak type epoxy resins (for example, phenol novolak type epoxy resins, cresol novolak type epoxy resins, biphenyl type epoxy resins), naphthalene type epoxy resins, for example, triepoxypropyl isocyanurate (triglycidyl isocyanate) Nurate), nitrogen-containing ring epoxy resins such as hydantoin epoxy resins, for example, aliphatic epoxy resins, alicyclic epoxy resins (for example, dicyclocyclic epoxy resins), Glycidyl ether type epoxy resin, glycidyl ester type epoxy resins, and glycidyl amine type epoxy resin.

These epoxy resins may be used alone or in combination. Among these epoxy resins, in view of reinforcing properties, bisphenol type epoxy resins such as dimer acid-modified bisphenol A type epoxy resins are preferably used.
Moreover, such an epoxy resin has an epoxy equivalent of, for example, 90 to 1000 g / eq.

Examples of the synthetic rubber include styrene synthetic rubber, acrylonitrile / butadiene rubber (NBR: acrylonitrile / butadiene copolymer), isoprene rubber, butadiene rubber, and the like.
The styrene synthetic rubber is a synthetic rubber in which at least styrene is used as a raw material monomer, and is not particularly limited. For example, styrene / butadiene random copolymer, styrene / butadiene / styrene block copolymer, styrene / Examples thereof include styrene / butadiene rubbers such as ethylene / butadiene copolymers and styrene / ethylene / butadiene / styrene block copolymers, and styrene / isoprene rubbers such as styrene / isoprene / styrene block copolymers.

In the mixture of the epoxy resin and the synthetic rubber, the compounding ratio of the epoxy resin is, for example, 30 to 95 parts by weight, preferably 40 to 90 parts by weight with respect to 100 parts by weight of the mixture.
When the thermosetting resin contains an epoxy resin, a curing agent is preferably used in combination.
The curing agent is an epoxy resin curing agent, and is a compound having activity in a temperature range of 80 to 200 ° C., specifically, an amine compound, an acid anhydride compound, an amide compound, a hydrazide compound, Examples include imidazole compounds and imidazoline compounds.

Examples of the amine compound include ethylenediamine, propylenediamine, diethylenetriamine, triethylenetetramine, amine adducts thereof, metaphenylenediamine, diaminodiphenylmethane, and diaminodiphenylsulfone.
Acid anhydride compounds include, for example, phthalic anhydride, maleic anhydride, tetrahydrophthalic anhydride, hexahydrophthalic anhydride, methyl nadic anhydride, pyromellitic anhydride, dodecenyl succinic anhydride, dichlorosuccinic acid. Examples include acid anhydrides, benzophenone tetracarboxylic acid anhydrides, and chlorendic acid anhydrides.

Examples of amide compounds include dicyandiamide and polyamide.
Examples of the hydrazide compound include dihydrazides such as adipic acid dihydrazide.
Examples of imidazole compounds include methylimidazole, 2-ethyl-4-methylimidazole, ethylimidazole, isopropylimidazole, 2,4-dimethylimidazole, phenylimidazole, undecylimidazole, heptadecylimidazole, 2-phenyl-4- And methyl imidazole.

Examples of the imidazoline compounds include methyl imidazoline, 2-ethyl-4-methyl imidazoline, ethyl imidazoline, isopropyl imidazoline, 2,4-dimethyl imidazoline, phenyl imidazoline, undecyl imidazoline, heptadecyl imidazoline, 2-phenyl-4- And methyl imidazoline.
These curing agents may be used alone or in combination. Of these curing agents, in view of adhesiveness, an amide compound is preferable.

Moreover, although the mixture ratio of a hardening | curing agent is based also on the equivalent ratio of a hardening | curing agent and an epoxy resin, it is 3-30 weight part with respect to 100 weight part of epoxy resins, for example.
Moreover, a hardening accelerator can be used together with a hardening | curing agent as needed.
Examples of the curing accelerator include ureas (including 3- (3,4-dichlorophenyl) -1,1-dimethylurea (DCMU)), tertiary amines, phosphorus compounds, quaternary ammonium salts, organics. Examples include metal salts. These may be used alone or in combination. The blending ratio of the curing accelerator is, for example, 0.1 to 20 parts by weight with respect to 100 parts by weight of the epoxy resin.

When the thermosetting resin contains a synthetic rubber, a crosslinking agent (vulcanizing agent) is preferably used in combination.
The crosslinking agent is a synthetic rubber crosslinking agent (vulcanizing agent), and examples thereof include sulfur, peroxide, quinonedioxime, metal oxide (for example, zinc oxide, magnesium oxide, etc.), alkylphenol and the like. The mixing ratio of the crosslinking agent is, for example, 0.5 to 30 parts by weight with respect to 100 parts by weight of the synthetic rubber.

Moreover, a crosslinking accelerator (vulcanization accelerator) can be used in combination with the crosslinking agent as required.
Examples of the crosslinking accelerator include aldehyde ammonia, aldehyde amine, thiourea, thiazole, sulfenamide, thiuram, and dithiocarbamate. The mixing ratio of the crosslinking accelerator is, for example, 0.5 to 20 parts by weight with respect to 100 parts by weight of the synthetic rubber.

The resin composition contains a foaming agent in addition to the thermosetting resin described above.
The foaming agent is a heating foaming agent that foams by heating, and examples thereof include an inorganic foaming agent and an organic foaming agent. Examples of the inorganic foaming agent include ammonium carbonate, ammonium hydrogen carbonate, sodium hydrogen carbonate, ammonium nitrite, sodium borohydride, azides and the like.

  Examples of organic foaming agents include N-nitroso compounds (N, N′-dinitrosopentamethylenetetramine, N, N′-dimethyl-N, N′-dinitrosotephthalamide, etc.), azo compounds, and the like. (Eg, azobisisobutyronitrile, azodicarboxylic acid amide, barium azodicarboxylate, etc.), fluorinated alkanes (eg, trichloromonofluoromethane, dichloromonofluoromethane, etc.), hydrazine compounds (eg, p-toluenesulfonyl) Hydrazide, diphenylsulfone-3,3′-disulfonylhydrazide, 4,4′-oxybis (benzenesulfonylhydrazide), allylbis (sulfonylhydrazide) and the like, semicarbazide compounds (for example, p-toluylenesulfonyl semicarbazide, 4,4 '-Oki Bis (benzenesulfonyl semicarbazide), etc.), triazole compound (e.g., 5-morpholyl-1,2,3,4-thiatriazole, etc.) and the like.

  As the foaming agent, a heat-expandable substance (for example, isobutane, pentane, etc.) is enclosed in a microcapsule (for example, a microcapsule made of a thermoplastic resin such as vinylidene chloride, acrylonitrile, acrylic acid ester, methacrylic acid ester). Examples thereof include thermally expanded fine particles. As such thermally expandable fine particles, for example, commercially available products such as microspheres (trade name, manufactured by Matsumoto Yushi Co., Ltd.) are used.

These foaming agents may be used alone or in combination. Of these foaming agents, 4,4′-oxybis (benzenesulfonylhydrazide) (OBSH) is preferably used in consideration of stable foaming without being influenced by external factors.
The blending ratio of the foaming agent is 20 parts by weight or less and usually 0.1 parts by weight or more with respect to 100 parts by weight of the thermosetting resin.

Moreover, a foaming accelerator can be used together with a foaming agent as necessary. Examples of the foam accelerator include guanidine compounds. These foaming accelerators may be used alone or in combination. The blending ratio of the foaming accelerator is, for example, 10 parts by weight or less with respect to 100 parts by weight of the thermoplastic resin.
In addition to the above components, the resin composition includes a filler, an anti-sagging agent (thixotropic agent), a low-polar rubber, and, if necessary, for example, a pigment, a tackifier, a thixotropic agent, Known additives such as a lubricant, an anti-scorch agent, a stabilizer, a softening agent, a plasticizer, and an anti-aging agent can be added at an appropriate ratio.

  Examples of the filler include calcium carbonate (for example, heavy calcium carbonate, light calcium carbonate, white gloss, etc.), talc, mica, clay, mica powder, silica, alumina, aluminum silicate, titanium oxide, carbon black, acetylene black, Examples thereof include aluminum powder and glass powder (powder). These fillers can be used alone or in combination. The blending ratio of the filler is, for example, 1 to 500 parts by weight, preferably 10 to 300 parts by weight with respect to 100 parts by weight of the thermosetting resin.

Examples of the sag preventive agent include organic bentonite, carboxymethyl cellulose, sodium alginate, aluminum stearate and the like. These sagging inhibitors may be used alone or in combination, and the blending ratio is, for example, 0.1 to 30 parts by weight with respect to 100 parts by weight of the thermosetting resin.
The low-polar rubber is, for example, rubber having no polar group such as amino group, carboxyl group, and nitrile group. For example, solid or liquid synthetic rubber such as butadiene rubber, polybutene rubber, and synthetic natural rubber is used. Can be mentioned. These low polar rubbers can be used alone or in combination. The blending ratio of the low polar rubber is, for example, 1 to 100 parts by weight, preferably 5 to 70 parts by weight with respect to 100 parts by weight of the thermosetting resin.

Next, an embodiment of a method for producing a steel sheet reinforcing sheet of the present invention will be described with reference to FIG.
First, in this method, a constraining layer 2 is prepared as shown in FIG.
Next, in this method, as shown in FIG. 2 (b), the thermosetting resin layer 3 is formed by laminating the resin composition on the surface of the constraining layer 2 in the pattern described above.

In order to form the thermosetting resin layer 3, first, a resin composition is prepared by blending the above-described components in the blending ratio described above. In order to prepare the resin composition, for example, the resin composition is kneaded with a mixing roll, a pressure kneader, an extruder, or the like to prepare a paste-like resin composition (hereinafter referred to as a paste composition).
Next, the paste composition is laminated on the surface of the constraining layer 2 in the pattern described above to form the thermosetting resin layer 3.

  In order to form the thermosetting resin layer 3 with the above-described pattern, for example, first, a paste composition is formed with the above-described pattern on a release sheet such as a PET sheet, and then this is formed on the constraining layer 2. A method (transfer method) in which the transfer sheet is transferred to the top and then the release sheet is peeled off from the thermosetting resin layer 3 is exemplified. Or the method (direct coating method) etc. which directly form a paste composition in the above-mentioned constrained layer 2 by a well-known patterning method are mentioned.

In the transfer method, examples of the method of forming the resin composition in a pattern on the release sheet include patterning methods such as drawing under computer control and a combing method. A combing method is preferable.
In the comb scraping method, first, the paste composition described above was applied to the entire surface of the release sheet, and then applied by a comb (not shown) having a scraping leg corresponding to the streaky space 4. The paste composition is scraped off.

Moreover, as a method of forming the paste composition in a pattern on the constraining layer 2 in the direct application method, for example, a patterning method similar to the above can be mentioned. In the comb scraping method, first, the above paste composition is applied to the entire surface of the constraining layer 2, and then the applied resin composition is scraped by a comb having a scraping leg corresponding to the streaky space 4. Take and remove.
Thereby, the steel plate reinforcement sheet 1 provided with the constraining layer 2 and the thermosetting resin layer 3 laminated thereon can be obtained.

In addition, the thickness (total thickness of the thermosetting resin layer 3 and the constraining layer 2) of the steel plate reinforcing sheet 1 is, for example, 0.5 to 5 mm, or preferably 0.6 to 3.5 mm.
Next, a method for reinforcing the steel plate 6 using the steel plate reinforcing sheet 1 will be described with reference to FIG.
In this method, first, the steel plate reinforcing sheet 1 is disposed on the steel plate 6 as shown in FIG. Specifically, the surface (upper surface) of the thermosetting resin layer 3 of the steel plate reinforcing sheet 1 is attached to the surface (lower surface) of the steel plate 6. The steel plate 6 is not particularly limited, and is formed from a thin metal plate or the like.

Then, as shown in FIG.3 (b), while heating the steel plate reinforcement sheet 1, the thermosetting resin layer 3 is hardened and it is made to foam. Although heating temperature is based also on the kind of resin composition, it is 160-210 degreeC, for example.
Then, the thermosetting resin layer 3 is increased in strength and thickness due to curing and foaming to become the foam cured layer 5.

In addition, the volume expansion ratio at the time of foaming of the foaming hardening layer 5 after foaming is 5.0 times or less, for example, and is 1.1 times or more normally. The density of the foamed cured layer 5 (the volume of the weight of the foaming and curing layer 5 (g) / foamed cured layer 5 (g / cm ³⁾⁾ is, for example, 0.2 to 1.0 g / cm ^3.
In addition, the thickness of the foaming hardening layer 5 after foaming is 8 mm or less, for example, Preferably, it is 5 mm or less. Moreover, the width W1 of each streaky space 4 after foaming is, for example, 0.2 to 10 mm.

  In the steel sheet reinforcing sheet 1, the streaky space 4 is formed not in the constraining layer 2 but in the thermosetting resin layer 3. That is, no opening (a space such as a slit penetrating in the thickness direction) is formed in the constraining layer 2, and the constraining layer 2 is formed flat. Therefore, the constraining layer 2 can reliably restrain the thermosetting resin layer 3 to improve the strength of the steel plate reinforcing sheet 1, and thereby the steel plate 6 can be reliably reinforced. Furthermore, adhesion between the constraining layers 2 can be prevented, and excellent handleability can be realized.

Further, in the steel sheet reinforcing sheet 1, even when the heated thermosetting resin layer 3 and the constraining layer 2 are subjected to stress due to heating, the stress can be dispersed by the streaks 4. For this reason, it is possible to prevent the heated thermosetting resin layer 3, that is, the foam cured layer 5 from being damaged and the steel plate 6 from being deformed.
Further, in the steel sheet reinforcing sheet 1, even if unintended bubbles (voids) are formed between the constraining layer 2 and the thermosetting resin layer 3, the bubbles can be released to the streak space 4. Therefore, it is possible to prevent the steel plate reinforcing sheet 1 from dropping off or the reinforcing property from being lowered due to unintended bubbles (voids). In particular, in the steel sheet reinforcing sheet 1, since the streaky space 4 has a wave shape, the stress applied from the adjacent direction X and the orthogonal direction Y can be dispersed along the wavy streaky space 4.

  Further, in this manufacturing method, the thermosetting resin layer 3 is formed by laminating the resin composition (paste composition) so that the streaky space 4 is formed. Therefore, after the formation of the thermosetting resin layer 3, it is possible to eliminate the need to separately form a space such as the streaky space 4. Moreover, since the thermosetting resin layer 3 is formed in advance so that the streak space 4 is secured, the streak space 4 can be easily and reliably formed. Therefore, it is a simple method, and excellent workability can be ensured while reducing the number of manufacturing steps.

  In the above description, the wave shape of each streaky space 4 is formed as a sine wave. For example, although not shown, a triangular wave (isosceles triangular wave) shape, a rectangular wave shape, a trapezoidal wave shape, an arc wave shape, an elliptical arc An appropriate wave shape such as a wave shape can be formed. Preferably, it is formed into a wave shape such as a sine wave shape, a circular wave shape, or an elliptical arc wave shape having a curved portion that is gently curved. Thereby, the stress applied to each thermosetting resin layer 3 can be uniformly dispersed while relaxing along the curved portion of the streaky space 4.

  In the above description, each streak space 4 is formed in a wave shape having the same phase. However, for example, the streaky spaces 4 may be formed in different phases (shifted). Specifically, as shown in FIG. 4, the streak spaces 4 are formed by shifting the phases adjacent to each other by ½. In that case, each thermosetting resin layer 3 has a wide portion 7 having a wide width (length in the adjacent direction X) and a narrow portion 8 narrower than the wide portion 7 along the orthogonal direction Y. It is formed in a shape that is alternately arranged one after another.

Preferably, as shown in FIG. 1, each streak space 4 is formed in a waveform having the same phase. Thereby, each thermosetting resin layer 3 is formed with a uniform width, stress concentration in the thermosetting resin layer 3 can be prevented, and damage to the thermosetting resin layer can be further prevented.
In the description shown in FIG. 1 described above, the interval W1 between the streaks 4 is the same in the orthogonal direction Y. However, for example, it can be different in the orthogonal direction Y as shown in FIG.

In FIG. 5, the interval W <b> 1 in the adjacent direction X in each streaky space 4 gradually becomes wider from each mountain (valley) toward the reference line S (virtual line). That is, the shortest width (that is, the length in the direction orthogonal to the traveling direction in which each of the streaks 4 meanders) D is the same in the orthogonal direction Y.
Preferably, as shown in FIG. 1, the interval W <b> 1 between the streaks 4 is the same over the orthogonal direction Y. Thus, when the resin composition is formed into a pattern by a combing method, the resin composition is laminated on the entire surface using a long release sheet (or constraining layer 2) extending in the orthogonal direction. While the release sheet is continuously running in the orthogonal direction Y, a comb having a scraping foot having the same width as the interval W1 between the streaks 4 is reciprocated in the adjacent direction X. Therefore, the streak-like space 4 meandering into a wave shape can be formed by a simple combing method.

In the above description, the foam cured layer 5 is formed by heating the thermosetting resin layer 3 made of a resin composition containing a foaming agent. For example, although not shown, the foaming agent (and the foam accelerator) The cured layer (cured layer that does not foam) can also be formed by heating the thermosetting resin layer 3 made of a resin composition that does not contain ().
Preferably, the resin composition contains a foaming agent. As a result, the steel sheet reinforcing sheet 1 is further improved in rigidity because the thickness is increased by the formation of the foamed hardened layer 5 after foaming, so that the strength can be further improved.

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples and comparative examples, but the present invention is not limited to the examples and comparative examples.
Example 1
90 parts of dimer acid-modified bisphenol A type epoxy resin (Epototo YD-172, manufactured by Tohto Kasei Co., Ltd.), 10 parts of solid bisphenol A type epoxy resin (Epicoat # 1001, manufactured by Japan Epoxy Resin Co., Ltd.), polybutene (low polarity rubber, polybutene HV) -300, manufactured by Nippon Petrochemical Co., Ltd.) 10 parts, talc 100 parts, organite (anti-sagging agent, organic bentonite, manufactured by Nippon Organic Clay Co., Ltd.) 5 parts, and carbon black 1 part mixed roll heated to 120-130 ° C. After being kneaded and cooled, the kneaded product was mixed with 5 parts of dicyandiamide (curing agent), 0.5 part of DCMU (curing accelerator, DCMU-99, manufactured by Hodogaya Chemical Co., Ltd.), OBSH (foaming agent, Neoselbon N #). 4 parts (1000S, manufactured by Eiwa Kasei Kogyo Co., Ltd.) were further added and kneaded with a mixing roll. Thereby, a paste composition was prepared.

Next, the paste composition was applied to the surface of the PET sheet (release sheet) so as to have a thickness of 1 mm. Next, the paste composition is formed so that a plurality of sinusoidal wave-shaped streaks having the amplitude A of 25 mm, the wavelength λ of 50 mm, the width (length in the adjacent direction) W1 of 1 mm, and the same phase are formed. The thermosetting resin layer was formed by scraping and removing the object.
Thereafter, the thermosetting resin layer is bonded to a constraining layer made of glass cloth (150 mm × 200 mm) having a thickness of 0.2 mm, and the thermosetting resin layer is transferred onto the constraining layer, thereby reinforcing the steel sheet reinforcing sheet. Got.

Example 2
A thermosetting resin layer was formed in the same manner as in Example 1 except that the width (length in the adjacent direction) W1 of the streaky space was changed to 3 mm, and then a steel plate reinforcing sheet was obtained.
Example 3
A thermosetting resin layer was formed in the same manner as in Example 1 except that the width (length in the adjacent direction) W1 of the streaky space was changed to 4 mm, and then a steel plate reinforcing sheet was obtained.

Example 4
A thermosetting resin layer was formed in the same manner as in Example 1 except that the width (length in the adjacent direction) W1 of the streak space was changed to 0.2 mm, and then a steel plate reinforcing sheet was obtained.
Example 5
A thermosetting resin layer was formed in the same manner as in Example 1 except that the width (length in the adjacent direction) W1 of the streaky space was changed to 0.1 mm, and then a steel plate reinforcing sheet was obtained.

Example 6
A thermosetting resin layer was formed in the same manner as in Example 1 except that the width (length in the adjacent direction) W1 of the streak space was changed to 10 mm, and then a steel plate reinforcing sheet was obtained.
Example 7
In the preparation of the paste composition, a thermosetting resin layer was formed in the same manner as in Example 1 except that OBSH (foaming agent) was not added, and then a steel plate reinforcing sheet was obtained.

Comparative Example 1
A thermosetting resin layer was formed in the same manner as in Example 1 except that the paste composition was uniformly applied to the entire surface of the glass cloth, and then a steel plate reinforcing sheet was obtained.
Comparative Example 2
A sine wave slit having the same shape as in Example 1 was formed in the glass cloth of the steel sheet reinforcing sheet obtained in Comparative Example 1, and this was used as the steel sheet reinforcing sheet in Comparative Example 2.

(Evaluation)
(1) Adhesiveness The steel plate reinforcement sheet of each Example and each comparative example is attached to a steel plate (made of aluminum) having a size of 200 mm × 300 mm, and the presence or absence of bubbles between the thermosetting resin layer and the steel plate is checked. It was observed visually. The results are shown in Table 1.
(2) Distortion of steel plate The steel plate reinforcing sheet of each example and each comparative example was cut into a size of 50 mm × 100 mm, and this was attached to a steel plate having a thickness of 0.8 mm and a size of 200 mm × 300 mm, at 180 ° C. The mixture was heated for 20 minutes to be foam-cured (cured in Example 7), then allowed to cool and cooled to room temperature (23 ° C.). Thereafter, the distortion of the steel sheet was visually observed. The results are shown in Table 1.
(3) Bending strength The steel sheet reinforcing sheet of each example and each comparative example was cut into a size of 25 mm × 150 mm, and this was attached to a steel plate having a thickness of 0.8 mm and a size of 25 mm × 150 mm. The mixture was heated for minutes to be foam-cured (cured in Example 7), then allowed to cool and cooled to room temperature (23 ° C.). Thereafter, the bending strength was measured.

  In the measurement of the bending strength, each test piece was supported with a span of 100 mm with the steel sheet facing upward, and at the center in the longitudinal direction, the test bar was lowered from above in the vertical direction at a compression speed of 5 mm / min. And the bending strength when a thermosetting resin layer displaced 1 mm after contacting a steel plate was evaluated. The results are shown in Table 1.

The top view of one embodiment of the steel plate reinforcement sheet of the present invention is shown. It is process drawing which shows the manufacturing method of the steel plate reinforcement sheet | seat shown in FIG. 1, Comprising: It is sectional drawing corresponding to the BB line of FIG. 1, Comprising: (a) is a process of preparing a constrained layer, (b) is The process of forming a thermosetting resin layer with the pattern in which a streak-like space is formed by laminating | stacking a resin composition on the surface of a constrained layer is shown. (A) shows the process of arrange | positioning a steel plate reinforcement sheet to a steel plate, (b) shows the process of heating a steel plate reinforcement sheet and hardening and foaming a thermosetting resin layer. The top view of other embodiment (The aspect which the phase of the sine wave of each streaky space shifted | deviated 1/2) is shown. The top view of other embodiment (The aspect from which the width | variety of the adjacent direction of each streaky space differs in an orthogonal direction) of the steel plate reinforcement sheet | seat of this invention is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Steel plate reinforcement sheet 2 Constrained layer 3 Thermosetting resin layer 4 Streaky space T Thickness X of the thermosetting resin layer X Adjacent direction Y Orthogonal direction W1 Adjacent length of the streaky space

Claims (10)

A constrained layer;
A steel plate reinforcing sheet comprising: a thermosetting resin layer laminated on the constraining layer and disposed adjacent to each other with a wavy space penetrating in the thickness direction.   2. The steel sheet reinforcing sheet according to claim 1, wherein a plurality of the spaces are arranged at intervals in an adjacent direction, and the wave shapes of the spaces have substantially the same phase.   The thermosetting resin layer extends in an intersecting direction intersecting the adjacent direction, and is formed in a wave shape in which the adjacent direction length of the thermosetting resin layer is substantially the same over the intersecting direction. The steel sheet reinforcing sheet according to claim 2.   The steel sheet reinforcing sheet according to any one of claims 1 to 3, wherein a ratio of a length in an adjacent direction of the space to a thickness of the thermosetting resin layer is 0.2 to 15.   The steel sheet reinforcing sheet according to any one of claims 1 to 4, wherein the thermosetting resin layer contains a heating foaming agent that foams by heating. A constraining layer, and a thermosetting resin layer laminated on the constraining layer,
A steel plate reinforcing sheet obtained by preparing the constraining layer and forming a thermosetting resin layer on the surface of the constraining layer so as to be adjacent to each other with a space penetrating in the thickness direction. . Preparing a constraining layer;
By laminating a resin composition containing a thermosetting resin on the surface of the constraining layer so that a space penetrating in the thickness direction is formed, the thermosetting resin layer made of the resin composition is And a step of forming adjacent to each other across a space.   The method for manufacturing a steel sheet reinforcing sheet according to claim 7, wherein the space has a wave shape.   The method for manufacturing a steel sheet reinforcing sheet according to claim 8, wherein a plurality of the spaces are arranged at intervals in the adjacent direction, and the wave shapes of the spaces have substantially the same phase.   The thermosetting resin layer extends in an intersecting direction intersecting the adjacent direction, and is formed in a wave shape in which the adjacent direction length of the thermosetting resin layer is substantially the same over the intersecting direction. The manufacturing method of the steel plate reinforcement sheet of Claim 9.

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