JP2009270234A - Fiber sheet-like adhesive material, and composite using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fiber sheet-like adhesive material easy to handle in an adhesive step and having high peel strength. <P>SOLUTION: The fiber sheet-like adhesive material, which is formed of fibers comprising 50-95 mass% of a first component made from a thermoplastic resin and 5-50 mass% of a second component made from at least one compound selected from rosins, rosin esters, terpene-based compounds, piperylene-based compounds and hydrocarbon-based compounds, comprises a melt-blown nonwoven fabric or spunbonded nonwoven fabric made of the above fibers. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an adhesive for bonding an object to be bonded, and more particularly to a fiber sheet adhesive.

  Conventionally, for bonding organic materials such as paper, wood, rubber and plastic, and inorganic materials such as glass, ceramic and metal, for example, thermosetting resins such as vinyl acetate components, urea resins, melamine resins and epoxy resins. A thermosetting resin such as is used. And the adhesive agent was apply | coated and used for the adhesion | attachment target object with the liquid form or the solution. However, when an adhesive in liquid form or solution form is applied to an object to be bonded, there is a problem that density unevenness or application unevenness occurs and distortion occurs after drying. There is also a problem that dripping occurs when the adhesive is applied.

  Patent document 1 is disclosing the manufacturing method of the plywood which laminates | stacks a thermoplastic synthetic resin film on a single board, and presses on heating conditions. Moreover, patent document 2 is disclosing the manufacturing method of the plywood using a film adhesive. However, the film-like adhesives as shown in Patent Document 1 and Patent Document 2 have no followability to a non-smooth surface or a surface having irregularities, and are difficult to handle due to holes or wrinkles. There was a problem that uneven adhesion occurred.

  Patent Document 3 discloses a table tennis racket blade body bonded with an adhesive containing short fibers. In Patent Document 3, bonding is performed using an adhesive containing short fibers in order to reinforce bending strength. However, since the short fibers are included in addition to the adhesive component, there is a problem that the short fibers are not uniformly dispersed and the adhesive strength and peel strength are weakened.

  Patent Document 4 discloses a heat-adhesive conjugate fiber including a heat-bonding component including an ethylene copolymer resin and an adhesion promoter and a fiber-forming component. However, in the case of the form of the composite fiber, the fiber-forming component may inhibit the adhesiveness.

JP 58-082706 JP 59-185602 A JP2004-065470 JP 2006-144199 A

  The present invention provides a fiber sheet-like adhesive that is easy to handle in the bonding process of an object to be bonded and has excellent adhesive strength (peeling strength).

  The fiber sheet-like adhesive of the present invention is selected from 50% by mass to 95% by mass of a first component made of a thermoplastic resin and rosin, rosin ester, terpene base compound, piperylene base compound, and hydrocarbon base compound. It is formed from a fiber containing 5% by mass to 50% by mass of at least one second component, and includes a meltblown nonwoven fabric or a spunbonded nonwoven fabric composed of the fiber.

  The composite of the present invention includes the fiber sheet adhesive.

  The wood material composite of the present invention is characterized by including the fiber sheet adhesive.

  The fiber sheet-like adhesive of the present invention is easy to handle and has excellent adhesiveness in the step of bonding the object to be bonded.

  In order to solve the conventional problems, the inventor has studied an adhesive and found a fiber sheet-like adhesive that does not cause dripping when the adhesive is applied. Furthermore, there is no density unevenness or application unevenness that is a problem with adhesives in liquid form or solution form, and the fiber sheet has a structure excellent in adhesive strength (hereinafter also referred to as peel strength) when bonding objects to each other. The adhesive was found.

  That is, the fibrous sheet-like adhesive of the present invention comprises 50% to 95% by mass of a first component made of a thermoplastic resin, and rosin, rosin ester, terpene base compound, piperylene base compound, and hydrocarbon base compound. It is formed from a fiber containing 5% by mass to 50% by mass of at least one selected second component, and includes a meltblown nonwoven fabric or a spunbonded nonwoven fabric comprising the fiber.

  The first component of the present invention contains 50% by mass to 95% by mass of a thermoplastic resin, preferably 50% by mass to 70% by mass of a thermoplastic resin, and more preferably 55% by mass to 65% by mass of a thermoplastic resin. Including. The fiber sheet obtained when the thermoplastic resin is 50% by mass or more is easy to handle in the bonding step.

  The thermoplastic resin used in the present invention is not particularly limited, and specifically, polyethylene, polypropylene, ethylene-vinyl alcohol copolymer, ethylene-vinyl acetate copolymer, ethylene- (meth) acrylic acid copolymer. , Ethylene- (meth) methyl acetate copolymer, polyolefin resin such as ethylene- (anhydride) maleic acid, polyester resin such as polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polyamide such as nylon 6 and nylon 66 Based resins. Among them, thermoplastic resins are ethylene-vinyl alcohol copolymer, ethylene-vinyl acetate copolymer, ethylene- (meth) acrylic acid copolymer, ethylene- (meth) acetic acid from the viewpoint of compatibility with the second component. It is preferably at least one selected from a methyl copolymer and ethylene- (maleic anhydride).

  The thermoplastic resin used in the present invention is an ethylene-vinyl alcohol copolymer, an ethylene-vinyl acetate copolymer, an ethylene- (meth) acrylic acid copolymer, an ethylene- (meth) methyl acetate copolymer, and an ethylene- In the case of at least one selected from (anhydrous) maleic acid, the ethylene content in these copolymers is preferably 70 mol% to 98 mol%. When the copolymer has an ethylene content of 70 mol% or more, it can be easily made into fibers, and when the copolymer has an ethylene content of 98 mol% or less, a fiber sheet adhesive having excellent adhesiveness can be obtained.

  The thermoplastic resin used in the present invention preferably has a melting point of 70 ° C to 120 ° C, and more preferably a melting point of 80 ° C to 110 ° C. When the melting point of the thermoplastic resin is 70 ° C. or higher, there is little fusion between fibers and it is easy to form a nonwoven fabric. Further, when the melting point of the thermoplastic resin is 120 ° C. or less, the adhesiveness at a low temperature is excellent.

  The second component of the present invention comprises at least one selected from rosin, rosin ester, terpene base compound, piperylene base compound, and hydrocarbon base compound. As the second component, for example, in the case of rosin and rosin ester, gum rosin, wood rosin and tall oil rosin can be mentioned. In the case of a terpene base compound, a terpene compound, a terpene phenol compound, and a hydrogenated terpene compound are exemplified. In the case of a hydrocarbon base compound, an aromatic hydrocarbon compound is mentioned. Among these, the second component is preferably terpene phenol. Terpenephenol is represented by the general formula shown below (Chemical Formula 1), and is obtained by reacting terpene monomers of α-pinene, β-pinene, and dipentene with phenol.

  The fiber of this invention contains 5 mass%-50 mass% of the 2nd component, Preferably it contains 30 mass%-50 mass%, More preferably, it contains 35 mass%-45 mass%. When the second component is contained in an amount of 5% by mass or more, the adhesiveness to the bonding target is excellent. Further, when the second component is contained in an amount of 50% by mass or less, excessive fusion between the fibers is small, and it is easy to form a melt blown nonwoven fabric or a spunbond nonwoven fabric.

  The second component preferably has a softening point in the range of 100 ° C to 150 ° C, and more preferably has a softening point in the range of 110 ° C to 140 ° C. When the softening point of the second component is 100 ° C. or higher, the fibers are hardly fused immediately after spinning, and a fiber sheet is easily formed. Moreover, it is excellent in the adhesiveness in low temperature as the softening point of a 2nd component is 150 degrees C or less.

  The fiber used by this invention may contain other components in less than 10 mass% other than a 1st component and a 2nd component. Other components are not particularly limited, and examples include flame retardants, adhesion promoters, metal materials, and inorganic materials.

  The fiber constituting the fiber sheet adhesive of the present invention may be a single fiber or a composite fiber. Especially, it is preferable that it is the form of a single fiber. Here, a single fiber means that a fiber consists of one segment in a fiber cross section. The single fiber includes a fiber formed by mixing two or more components and a fiber formed of a polymer alloy. When the fiber is a single fiber, the fiber is easily softened evenly in the fiber cross section, so that the bonding temperature can be easily managed and handled. The form of the fiber cross section may be any form such as solid, hollow, or irregular.

  The fiber sheet-like adhesive of the present invention includes a meltblown nonwoven fabric or a spunbonded nonwoven fabric composed of fibers containing a first component and a second component. Especially, it is preferable that a fiber sheet adhesive contains the melt blown nonwoven fabric which consists of a fiber containing a 1st component and a 2nd component. Since the fiber sheet-like adhesive is configured to include a meltblown nonwoven fabric or a spunbond nonwoven fabric containing the first component and the second component, the fiber is directly formed into a sheet shape without being sufficiently stretched. Since each component is randomly arranged at the molecular level, it becomes easy to soften and a fiber sheet-like adhesive having excellent adhesion can be obtained. The property of being easily softened is particularly remarkable in the case of a melt blown nonwoven fabric. In addition, when the fiber sheet-like adhesive is a configuration including a meltblown nonwoven fabric containing the first component and the second component, due to the configuration that is a uniform and dense nonwoven fabric, when bonding the objects to be bonded together, When heat is applied, the components constituting the fiber sheet-like adhesive spread and a further excellent adhesive force can be obtained. Moreover, it is easy to adjust to the below-mentioned single fiber fineness, and it is easy to adjust to the range of the fabric weight mentioned later.

  The method for producing the fiber sheet adhesive of the present invention will be described by taking a single fiber as an example. A mixed component of the first component and the second component is prepared. The mixed ingredients may be provided in the form of a masterbatch. Then, using a suitable spinning nozzle so as to obtain a desired fiber cross-sectional structure, when obtaining a meltblown nonwoven fabric, a conventional meltblown method is used. When obtaining a spunbond nonwoven fabric, a conventional spunbond method is used. it can. The melt blown method is, for example, melt-extruded, blown-spun fibers spun from a spinneret as a fine fiber stream by a high-temperature and high-speed gas, and spun onto a collection belt or another layer placed on the collection belt. This can be done by collecting above. In the spunbond method, a resin is melt-extruded from an extruder, a resin is spun from a spinneret, and the spun fibers are taken up by an air-flow traction type device such as an air soccer, and the fibers together with the air current are collected on a collecting belt or Collect on another layer placed on the collection belt. Thereafter, if necessary, the web can be carried out by bonding the fibers to each other using a heating device such as a hot air spraying device or a heating roll.

  The single fiber fineness of the fiber containing the first component and the second component is preferably 0.05 dtex to 20 dtex, and the single fiber fineness is more preferably 0.1 dtex to 18 dtex. If the single fiber fineness is less than 0.05 dtex, sufficient adhesion may not be obtained, and if the single fiber fineness exceeds 20 dtex, the adhesion with the object to be bonded may be deteriorated. The single fiber fineness was calculated by observing a melt-blown nonwoven fabric or a spunbonded nonwoven fabric with an electron microscope magnified 50 to 1000 times, randomly selecting 150 fibers constituting the nonwoven fabric, measuring the fiber diameter, and calculating. .

  The fiber sheet adhesive of the present invention may be laminated with other layers, and examples of the other layers include woven fabrics, knitted fabrics, and non-woven fabrics. Among these, the other layer used by laminating is preferably a nonwoven fabric, and more preferably a spunbonded nonwoven fabric. When the fiber sheet adhesive is laminated with other layers, other functions can be imparted to the fiber sheet surface. For example, the adhesiveness can be adjusted. For example, the stacked layers can function as release paper.

It is preferable that the fiber sheet adhesive and the other layer are bonded to each other with fibers constituting a melt blown nonwoven fabric or a spunbond nonwoven fabric. When the fiber sheet adhesive and other layers are bonded with the fibers constituting the meltblown nonwoven fabric or spunbond nonwoven fabric, the meltblown nonwoven fabric or spunbond nonwoven fabric even if the other layer does not have sufficient adhesiveness The surface on which the other layers are arranged also has adhesiveness due to the fibers constituting the. Such a configuration can be obtained, for example, by accumulating the first component and the second component on another layer by using the above-described meltblown method or spunbond method. Further, it is preferable that the basis weight of the other layers is ^{5g / m 2 ~30g / m 2} . When the basis weight of the other layer is 5 g / m ^{2 to} 30 g / m ² , the fibers constituting the fiber sheet-like adhesive easily enter between the fibers constituting the other layers or inside the other layers. The decrease tends to be relatively small. For example, a spunbonded nonwoven fabric having a single fiber fineness of 1 dtex to 20 dtex may be used. In particular, when a laminated body obtained by placing a spunbonded nonwoven fabric on a support and melt-spraying and laminating by a melt blown method while sucking under a nozzle, fibers are formed between fibers constituting other layers or inside other layers. The fibers constituting the sheet-like adhesive are easy to enter, and both adhesiveness and reinforcing effect can be achieved.

Fiber sheet-like adhesive of the present invention preferably has a basis weight is ^{10g / m 2 ~200g / m 2} , more preferably the basis weight is ^{10g / m 2 ~100g / m 2} , a basis weight of 20 g / m further preferably ^{2 ~80g} / m ^2. When the basis weight is 10 g / m ² or more, unevenness in basis weight hardly occurs, and when the basis weight is 200 g / m ² or less, it can be suitably used in the field where the bonding objects are brought into close contact with each other. For example, a plywood described later.

  Since the fiber sheet-like adhesive of the present invention is in the form of a fiber sheet, it is easy to follow a bent surface or an uneven surface and is excellent in handleability. In addition, there is little or no entanglement due to static electricity or the like. Therefore, the fiber sheet-like adhesive of the present invention can be used for applications in which two or more objects to be bonded are bonded. Examples of objects to be bonded include organic materials such as woven fabrics, knitted fabrics, nonwoven fabrics, paper, wooden materials, rubber, foams, and resin molded products, and inorganic materials such as glass, bricks, tiles, ceramics, cement materials, stone materials, and metals. Materials.

  The composite of the present invention includes the fiber sheet adhesive of the present invention. Here, the composite refers to a structure in which two or more objects to be bonded are bonded. Two or more objects to be bonded may be the same type of combination or different types of combinations. Especially, as for a composite, it is preferable that 1 or more of the adhesion target object is a wooden material, and it is more preferable that it is a composite of wooden materials. Furthermore, the composite of the present invention is preferably a plywood.

  The fiber sheet adhesive of the present invention is particularly excellent as an adhesive when molding a plywood. Note that the plywood is a board obtained by laminating thinly cut single plates made of a wooden material or the like, with the fiber directions orthogonal to each other, and alternately laminating and hot-pressure bonding. When the fiber sheet adhesive of the present invention is used when bonding the veneer, the fiber sheet adhesive can be laminated between the veneer and the veneer and bonded by heat and pressure to obtain a plywood. There is no process to apply and excellent processability. Further, there is no problem of dripping of the adhesive or drying, and the handleability is also good. Furthermore, the fiber sheet adhesive of the present invention does not generate formaldehyde even when decomposed, and can be widely used in the field where people come into contact.

  The composite containing the fiber sheet adhesive of the present invention includes a wall material, a floor material, a ceiling material, a shutter board, a scaffolding material for a construction site, a concrete formwork, a signboard, a bulletin board, a drawing board, a desk, a chair, a shelf, and a bag. , Skis, snowboards, surfboards, table tennis tables, table tennis rackets, etc.

[Tensile shear bond strength]
The measurement was performed according to JIS K 6851.
Three commercially available wooden boards of 80 mm × 25 mm and 3 mm thickness are prepared, and an adhesive is laminated between the two wooden boards so that the bonding area A is 25 mm × 13 mm, and is added using a hot press machine. Heat-pressure bonding was performed under the conditions of a pressure temperature of 105 ° C., a pressing force of 10 kg / cm ² , and a pressing time of 2 minutes. Under this condition, three wooden composites are produced. The obtained wooden composite was pulled at a rate of 2 mm / min with a tensile tester, and the maximum load P was determined. The tensile shear bond strength S was calculated from S = P / A.

[Single fiber fineness]
Single fiber fineness is an average of single fiber fineness calculated by observing a melt-blown nonwoven fabric or a spunbond nonwoven fabric with an electron microscope magnified 500 times, randomly selecting 150 fibers constituting the nonwoven fabric, and measuring the fiber diameter. And asked.

(Raw material 1)
60% by mass of an ethylene-acrylic acid copolymer (trade name N1035, manufactured by Mitsui DuPont Polychemical Co., Ltd.) having a melting point of 100 ° C. and an ethylene content of 90 mol% as the first component, and a terpene as the second component Phenol (trade name: YS Polystar T115, Yasuhara Chemical Co., Ltd.) was mixed with 40% by mass to obtain raw material 1.

Example 1
A spunbonded nonwoven fabric (trade name: Shinwa 6615, manufactured by Shinwa Co., Ltd.) having a single fiber fineness of 6.6 dtex and having a basis weight of 15 g / m ² as a main component was prepared. While placing the spunbond nonwoven fabric on the transport belt of the meltblown apparatus and continuously supplying it, the raw material 1 is sucked under the nozzle by the meltblown method onto the surface of the spunbond nonwoven fabric, and the weight per unit area is on the spunbond nonwoven fabric. Was accumulated so as to be 15 g / m ² to obtain a fiber sheet-like adhesive having a basis weight of 30 g / m ² . The single fiber fineness was 0.5 dtex.

Accumulation by the melt blown method was performed according to the following conditions.
Polymer melting temperature (° C.) 230
Polymer discharge rate (g / min) 15
Hot air temperature (℃) 300
Hot air flow rate (m ³ / min) 2.2
Hot air pressure (MPa) 0.2
Orifice hole diameter (mm) 0.35
Nozzle width (mm) 800
Nozzle pitch (mm) 0.8
Production speed (m / min) 6.1

(Example 2)
Used when manufacturing Example 1 except that the raw material 1 was accumulated on the spunbonded nonwoven fabric by the melt blown method so that the basis weight was 20 g / m ² and the production speed was 4.6 m / min. A fiber sheet-like adhesive having a basis weight of 35 g / m ² was obtained according to the same procedure as described above. The single fiber fineness was 0.5 dtex.

(Example 3)
Used when manufacturing Example 1 except that the raw material 1 was accumulated on the spunbonded nonwoven fabric by the melt blown method so that the basis weight was 25 g / m ² and the production speed was 3.7 m / min. A fiber sheet-like adhesive having a basis weight of 40 g / m ² was obtained according to the same procedure as described above. The single fiber fineness was 0.5 dtex.

Example 4
Used when manufacturing Example 1 except that the raw material 1 was accumulated on the spunbonded nonwoven fabric by the melt blown method so that the basis weight was 35 g / m ² and the production speed was 2.6 m / min. A fiber sheet-like adhesive having a basis weight of 50 g / m ² was obtained according to the same procedure as described above. The single fiber fineness was 0.5 dtex.

(Example 5)
Used when manufacturing Example 1 except that the raw material 1 was accumulated on the conveyor belt by the melt blown method so that the basis weight was 35 g / m ² and the production speed was 2.6 m / min. A fiber sheet-like adhesive having a basis weight of 35 g / m ² was obtained according to the same procedure as described above. The single fiber fineness was 0.5 dtex.

(Example 6)
Example 1 except that the raw material 1 was accumulated on the conveyor belt so as to have a basis weight of 70 g / m ² by the melt blown method, the polymer discharge rate was 20 g / min, and the production speed was 1.7 m / min. A fiber sheet-like adhesive having a basis weight of 70 g / m ² was obtained according to the same procedure as that adopted when manufacturing. The single fiber fineness was 0.9 dtex.

(Comparative Example 1)
A card web made of a core-sheath type composite fiber (trade name NBF (A), manufactured by Daiwabo Polytech Co., Ltd.) having a single fiber fineness of 2.2 dtex, a fiber length of 51 mm, a core component of polypropylene, and a sheath component of ethylene-acrylic acid copolymer. Was heat-bonded at 110 ° C. for 30 seconds to obtain a fiber sheet-like adhesive comprising a thermal bond nonwoven fabric having a basis weight of 15 g / m ² .

(Comparative Example 2)
A fiber sheet-like adhesive was obtained according to the same procedure as that adopted when producing Comparative Example 1 except that the basis weight was 35 g / m ² .

(Comparative Example 3)
^On the spunbonded nonwoven fabric having a basis weight of 15 g / m ² used in Example 1, the card web made of the core-sheath type composite fiber used in Comparative Example 1 was laminated so as to have a basis weight of 15 g / m ^2, and 110 ° C. For 30 seconds to obtain a fiber sheet-like adhesive having a basis weight of 30 g / m ² .

  Table 1 shows the tensile shear bond strengths of the wood composites using Examples 1 to 6 and Comparative Examples 1 to 3.

  In Examples 1 to 5, the tensile shear bond strength was high. On the other hand, Comparative Examples 1 to 3 had low tensile shear adhesive strength, and sufficient adhesive strength was not obtained. Further, the wood composite of Comparative Example 3 had very low adhesive strength, and peeling occurred before measuring the tensile shear adhesive strength with a tensile tester.

  When Example 1 and Comparative Example 3 were compared, Example 1 had excellent adhesive strength, but Comparative Example 3 had very low adhesive strength. Moreover, when Example 5 and Comparative Example 2 were compared, Example 5 had excellent adhesive strength, but Comparative Example 2 had low adhesive strength.

  The fiber sheet adhesive of the present invention is an organic material such as woven fabric, knitted fabric, nonwoven fabric, paper, wooden material, rubber, foam, resin molding, glass, brick, tile, ceramic, cement material, stone material, metal, etc. It can be used for adhesion of inorganic materials. The composite of the present invention includes a wall material, a floor material, a ceiling material, a shutter board, a scaffolding material for a construction site, a concrete formwork, a signboard, a bulletin board, a drawing board, a desk, a chair, a shelf, a bag, a ski board, and a snowboard. It can be used in various fields such as surfboards, table tennis tables and table tennis rackets.

Claims (7)

50% by mass to 95% by mass of a first component made of a thermoplastic resin,
A rosin, a rosin ester, a terpene base compound, a piperylene base compound, and a second component consisting of at least one selected from a hydrocarbon base compound and formed from a fiber containing 5% by mass to 50% by mass;
A fiber sheet-like adhesive comprising a meltblown nonwoven fabric or a spunbond nonwoven fabric made of the fibers.   The fiber sheet adhesive according to claim 1, wherein the fiber is a single fiber.   The fiber sheet adhesive according to claim 1 or 2, wherein the thermoplastic resin is a thermoplastic resin having a melting point of 70C to 120C.   The thermoplastic resin is an ethylene-vinyl alcohol copolymer, an ethylene-vinyl acetate copolymer, an ethylene- (meth) acrylic acid copolymer, an ethylene- (meth) methyl acetate copolymer, and an ethylene- (anhydrous) maleate. The fiber sheet adhesive according to any one of claims 1 to 3, wherein the fiber sheet adhesive is at least one selected from acids. Fiber sheet-like adhesive according to any one of claims 1 to 4, weight per unit area of the fibrous sheet-like adhesive material is characterized in that it is a ^{10g / m 2 ~200g / m 2} .   The composite_body | complex containing the fiber sheet-like adhesive material as described in any one of Claims 1-5.   A wooden material composite comprising the fiber sheet adhesive according to any one of claims 1 to 5.