JP6651430B2 - Seam treatment agent - Google Patents

Description

  The present invention relates to a novel seam treating agent.

  When laying an interior sheet such as a floor material, abutting portions where edges of adjacent interior sheets face each other are generated. The butted portion is a portion where the edges of the interior sheet are in contact with each other or a portion where the edges are opposed to each other with a small interval. Such a butted portion serves as a water entry port, and allows water to penetrate into the base. For this reason, processing (hereinafter, also referred to as "seam processing") for forming a seam portion, which is a portion that plays a role of integrally joining the interior sheets, is performed in the butted portion.

  Various methods have been proposed for performing the joint processing. For example, after the butt portion of the interior sheet is grooved with a cutting machine or grooving cutter and welded with a welding rod, the surplus portion is smoothly cut and finished, or the floor is laid on the base material with an adhesive. Adhesive tape is adhered to the floor material surface so as to cover the upper part of the seam having a gap of a predetermined width formed between the adhered floor materials, and a cut is made along the seam on the adhesive tape. Forming, inserting a seam liquid injection nozzle at the cut of the adhesive tape, injecting the seam liquid into the seam while moving the injection nozzle along the cut of the adhesive tape, and peeling the adhesive tape. There is known a seam construction method for floor materials to be made (Patent Document 1). The seam construction method as in Patent Literature 1 is generally called a seam method, and has an advantage that seam processing can be easily performed. In addition, since a formed joint becomes inconspicuous, it is widely used as a seam processing method for floor materials. Has been adopted.

  Here, the adhesive used in the seam method is also called a seam liquid. The seam liquid is roughly classified into two types, a solvent type and an emulsion type, according to its liquid form. Among them, the solvent-type seam liquid has the feature that the interior sheets can be more firmly joined together because the floor material is adhered while dissolving a part of the flooring material by the solvent contained therein. As such a solvent, for example, an organic solvent such as tetrahydrofuran (THF), methyl ethyl ketone, or cyclohexane is used (Patent Document 2).

Japanese Patent No. 3388960 JP-A-2005-4219

  However, since these conventional solvent-type seam liquids are prepared so as to strongly dissolve a part of the flooring material, when the seam liquid adheres to the interior sheet surface when filling the joint, the surface of the interior sheet may be damaged. Will melt and hurt. As a result, there arises a problem that the appearance of the interior sheet surface is significantly impaired. This is mainly due to the dissolving action of the organic solvent contained in the seam liquid.

  On the other hand, it is conceivable to use an organic solvent having a small dissolving effect on the interior sheet, but since such an organic solvent cannot effectively swell or dissolve the interior sheet, the interior sheet is strongly used. Joining cannot be performed, and it may be difficult to perform efficient seam processing. In other words, since the laid interior sheet may shrink due to temperature change or deterioration over time, it is necessary to have bonding strength enough to withstand it, but if the bonding strength is insufficient, the bonded part will shrink when shrinking. May be destroyed.

  For this reason, although development of a seam solution capable of performing a predetermined seam treatment as much as possible without damaging the surface of the interior sheet is desired, such a seam solution has not yet been developed.

  Therefore, a main object of the present invention is to provide a seam liquid that can smoothly perform seam treatment while suppressing or preventing damage to the surface of an interior sheet.

  The present inventor has conducted extensive studies in view of the problems of the prior art, and as a result, has found that the above object can be achieved by using a liquid treatment agent having a specific composition as a seam treatment agent, thereby completing the present invention. Reached.

That is, the present invention relates to the following seam treating agent.
1. A seam treatment agent used for filling a butt portion between interior sheets mainly composed of a vinyl chloride resin,
(1) The treatment agent is a liquid composition containing a vinyl chloride resin and an organic solvent,
(2) a vinyl chloride resin is dissolved in an organic solvent,
(3) the organic solvent contains a ketone solvent and an alcohol solvent;
A seam treating agent, characterized in that:
2. Item 2. The seam treating agent according to the above item 1, wherein the vinyl chloride resin contains a vinyl chloride-vinyl acetate copolymer.
3. Item 2. The seam treating agent according to item 1, wherein the content of tetrahydrofuran in the organic solvent is 10% by mass or less.
4. Item 2. The seam treating agent according to the above item 1, wherein the content of the alcohol-based solvent is 10 to 25% by mass in the seam treating agent.
5. The seam treating agent according to the above item 1, wherein the ketone-based solvent is contained in an amount of 150 to 350 parts by mass with respect to 100 parts by mass of the alcohol-based solvent.
6. Item 3. The seam treating agent according to the above item 2, wherein the vinyl acetate content in the vinyl chloride-vinyl acetate copolymer is 13 to 25% by mass.
7. Item 2. The seam treating agent according to the above item 1, wherein the content of the vinyl chloride resin is 20 to 35% by mass in the seam treating agent.

  ADVANTAGE OF THE INVENTION According to this invention, the surface of an interior sheet is hardly damaged, and the joint processing agent which can perform desired joint processing can be provided.

  In particular, in the joint treatment agent of the present invention, by using a ketone-based solvent and an alcohol-based solvent in combination, the dissolution of the vinyl chloride-based resin as a resin component in the solvent can be promoted. That is, the alcohol-based solvent hardly dissolves the vinyl chloride-based resin, but by using this together with the ketone-based solvent, the dissolution of the vinyl chloride-based resin can be promoted. As a result, a relatively large amount of vinyl chloride resin can be contained in the treating agent. In other words, a high solid content can be realized, and the seam treatment can be performed efficiently.

  At the same time, a mixed solvent of a ketone-based solvent and an alcohol-based solvent has a weaker dissolving power for an interior sheet made of a vinyl chloride-based resin than THF or the like. However, the surface is hardly damaged, and the desired seam treatment can be effectively performed.

  The seam treating agent of the present invention having such characteristics can be suitably used as a seam liquid to be injected into a seam that is a portion where interior sheets used as a building material come into contact with each other. In particular, it can be suitably used as a seam liquid for joining floor material sheets by filling the butt portion between floor material sheets (tiles).

FIG. 2 shows a plan view of a plurality of interior sheets (floor materials) laid with a butted portion. As a first embodiment, an example of a procedure for filling a butt portion with the seam treating agent of the present invention will be described. As a second embodiment, an example of a procedure for filling a butt portion with the seam treating agent of the present invention will be described. As a third embodiment, an example of a procedure for filling a butt portion with the seam treating agent of the present invention will be described. It is a figure which shows the state which stuck the adhesive tape over both floor material surfaces so as to straddle a butting part.

1. Seam treatment agent The seam treatment agent of the present invention (the treatment agent of the present invention) is a seam treatment agent used for filling a butt portion between interior sheets mainly composed of a vinyl chloride resin,
(1) The treatment agent is a liquid composition containing a vinyl chloride resin and an organic solvent,
(2) a vinyl chloride resin is dissolved in an organic solvent,
(3) the organic solvent contains a ketone solvent and an alcohol solvent;
It is characterized by the following.

  Here, in order to distinguish it from the vinyl chloride resin in the interior sheet, the vinyl chloride resin contained in the treating agent of the present invention is referred to as “resin component” unless otherwise specified.

Interior Sheet The treatment agent of the present invention is filled into the butted portions of interior sheets and finally used to join the interior sheets. More specifically, it is used as a seam liquid applied to the seam treatment method described below.

  The material of the interior sheet is not particularly limited as long as it is mainly composed of a vinyl chloride resin. In the present invention, "mainly composed of a vinyl chloride resin" means that 1) when the interior sheet has a single-layer structure of a sheet body (base layer), the sheet body is made of a vinyl chloride resin. 2) When the interior sheet has a multilayer structure of a sheet body and another single layer or multiple layers, it means that at least the sheet body is made of a vinyl chloride resin. . In particular, when the interior sheet has a multilayer structure, it is desirable that 50% or more, particularly 80% or more of the thickness thereof be occupied by a layer made of a vinyl chloride resin. That is, by this, 50% or more, particularly 80% or more, of the area of the surfaces where the interior sheets come into contact with each other in the seam treatment is made of a vinyl chloride resin, so that the treatment agent of the present invention enables more effective seam treatment. It can be carried out.

  When the interior sheet has a multilayer structure, for example, a laminate in which at least one of a design layer, a reinforcing layer, a surface protective layer, and the like is formed on a sheet body made of a vinyl chloride resin can be used.

  In particular, in the present invention, it is preferable that a protective layer is laminated on at least the outermost surface of the sheet body made of a vinyl chloride resin. The protective layer is not particularly limited as long as it can stably adhere to the adjacent layer, and various types of polyvinyl chloride resin, low density polyethylene resin, high density polyethylene resin, polyester resin, ethylene vinyl acetate copolymer, etc. Can be used. Further, an ultraviolet curable resin can also be used. The UV-curable resin is not particularly limited, and is, for example, unsaturated polyesters such as a condensate of an unsaturated dicarboxylic acid and a polyhydric alcohol, methacrylates such as polyester methacrylate, polyether methacrylate, polyol methacrylate, melamine methacrylate, and polyester acrylate. And acrylates such as epoxy acrylate, urethane acrylate, polyether acrylate, polyol acrylate and melamine acrylate.

  In the present invention, it is preferable to use an ultraviolet curable resin from the viewpoint of more stably adhering to another layer and forming a strong film. That is, an interior sheet having a protective layer containing a UV-curable resin on the surface can be suitably used. When a protective layer containing a UV-curable resin is formed on the surface, even if the treating agent of the present invention adheres to the sheet surface (that is, the surface protective layer), it hardly damages the surface. After the treatment agent is dried, it can be easily peeled off with a finger or the like and removed. As a result, it is possible to omit the masking step using the adhesive tape which is required in the conventional method, and as a result, it is also possible to reduce the cost of seam processing and shorten the construction period.

  The thickness of the protective layer is not particularly limited and can be appropriately set, but is usually about 0.005 to 0.040 mm, particularly preferably 0.010 to 0.030 mm, and more preferably 0.015 to 0.030 mm. More preferably, it is 0.025 mm.

  In addition, the use or application site of the interior sheet is not particularly limited, and includes, for example, various materials such as a floor material and a wall material, and can be particularly applied to a floor material. That is, the treatment agent of the present invention can be suitably used for a process of filling a butt portion between a plurality of floor materials (particularly, sheet-like floor materials). Therefore, the treating agent of the present invention can be suitably used for seam treatment of vinyl chloride floor tiles such as, for example, composition vinyl chloride floor tiles and multi-layer vinyl chloride floor tiles as flooring materials mainly composed of vinyl chloride resin. it can.

Treatment agent of the present invention The treatment agent of the present invention is a liquid composition containing a vinyl chloride resin and an organic solvent, wherein the vinyl chloride resin is dissolved in an organic solvent, and the organic solvent is a ketone solvent and an alcohol solvent. It is characterized by including.

  Examples of the vinyl chloride resin as a resin component include a vinyl chloride resin (homopolymer) and a copolymer containing vinyl chloride as a copolymerization component. Examples of such a copolymer include a vinyl chloride-vinyl acetate copolymer, a vinyl chloride-ethylene copolymer, a vinyl chloride-propylene copolymer, a vinyl chloride-styrene copolymer, and a vinyl chloride-isobutylene copolymer. And vinyl chloride-vinylidene chloride copolymer, vinyl chloride-butadiene copolymer, vinyl chloride-isoprene copolymer, vinyl chloride-chlorinated propylene copolymer, and the like. These resin components may be used alone or in combination of two or more. By using a vinyl chloride-based resin as the resin component, compatibility with a floor material mainly composed of a vinyl chloride-based resin is improved, and an effective seam treatment can be performed more reliably.

  In the treating agent of the present invention, it is particularly preferable to use at least a vinyl chloride-vinyl acetate copolymer as a resin component. By using a vinyl chloride-vinyl acetate copolymer as a resin component, the solubility in organic solvents is improved, and damage to the surface of the interior sheet is minimized, and an effective seam treatment is more reliably performed. It becomes possible. That is, by improving the solubility in an organic solvent, the amount of an organic solvent having high solubility in a vinyl chloride resin such as THF can be minimized or reduced to zero. Damage can be minimized.

  The content of vinyl acetate in the vinyl chloride-vinyl acetate copolymer as the resin component is not particularly limited, but is usually 10 to 30% by mass, particularly 12 to 25% by mass, and further preferably 13 to 24% by mass. It is desirable to do. Therefore, for example, a vinyl chloride-vinyl acetate copolymer having a vinyl acetate content of 15 to 25% by mass can also be suitably used. By setting the vinyl acetate content within the above range, the bonding strength between the interior sheets can be further increased, and even if the width of the butt portion is large, it does not flow down, and higher filling properties can be obtained. it can.

  The content of the resin component in the treating agent of the present invention can be appropriately set according to the type of the organic solvent to be used and the like, but is generally 20 to 35% by mass, and particularly preferably 20 to 30% by mass. Is preferred. By setting a relatively high concentration as described above, the interior sheets can be joined with relatively high strength without the organic solvent strongly dissolving the interior sheets. In addition, when the concentration of the resin component is increased, the viscosity increases, so that even if the width of the butt portion is large, the resin component does not flow down and higher filling properties can be obtained. As a result, it is possible to contribute to the efficiency of the seam processing.

  The organic solvent contained in the treating agent of the present invention includes a ketone solvent and an alcohol solvent. By using these two kinds of organic solvents in combination, it is possible to effectively dissolve the resin component in the solvent and to suppress or prevent the surface of the interior sheet from being damaged by the solvent.

  The ketone solvent is not particularly limited, and examples thereof include acetone, methyl ethyl ketone, diisobutyl ketone, cyclohexanone, and methyl isobutyl ketone (MIBK). Among them, methyl ethyl ketone is particularly preferable because it has relatively high volatility and lower volatility than alcohol. In this case, by using methyl ethyl ketone and another ketone-based solvent in combination, the curing speed and the like of the treating agent of the present invention can be arbitrarily controlled. For example, by using methyl ethyl ketone and acetone in combination, effects such as shortening of the curing time can be obtained. Further, for example, by using methyl ethyl ketone in combination with at least one of cyclohexanone and methyl isobutyl ketone, effects such as prolonging the curing time can be obtained.

  A ketone-based solvent having a higher volatility is preferable because drying after the seam treatment is faster, but a ketone-based solvent is more preferably lower in volatility than an alcohol-based solvent. That is, a combination of an alcohol-based solvent and a ketone-based solvent having higher volatility than the alcohol-based solvent can be suitably used. If the ketone-based solvent volatilizes before the alcohol-based solvent at the time of the seam treatment, the resin component that is insoluble in the alcohol-based solvent may become powdery and remain on the surface of the seam. On the other hand, when the alcohol-based solvent volatilizes first and then the ketone-based solvent volatilizes, a smooth seam portion is formed. When comparing the volatility, the vapor pressure of the solvent at 20 ° C. is a guide.

  The content of the ketone-based solvent in the treating agent of the present invention can be appropriately set according to the type of the organic solvent to be used, etc., and is generally 40 to 60% by mass, and particularly preferably 50 to 60% by mass. Is preferred.

  The alcohol solvent is not particularly limited, and examples thereof include methanol, ethanol, butanol, isobutanol, isopropyl alcohol, normal propyl alcohol, 1,3-butanediol, 1,4-butanediol, and benzyl alcohol. In particular, at least one of methanol, ethanol, normal propyl alcohol, and isopropyl alcohol is preferable because of its relatively high volatility and rapid drying after construction. Among them, particularly ethanol or a solvent containing ethanol as a main component is most preferable from the viewpoint of safety and the like.

  The content of the alcohol-based solvent in the treating agent of the present invention can be appropriately set according to the type of the organic solvent to be used and the like, but is generally 10 to 30% by mass, and particularly preferably 15 to 25% by mass. Is preferred.

  The ratio of the ketone-based solvent to the alcohol-based solvent in the treatment agent of the present invention is not particularly limited, but is preferably 150 to 350 parts by mass of the ketone-based solvent with respect to 100 parts by mass of the alcohol-based solvent. More preferably, the ketone solvent is used in an amount of 200 to 300 parts by mass with respect to 100 parts by mass. By setting the content within the above range, the resin component can be more reliably dissolved in the organic solvent.

  In the treating agent of the present invention, other solvents may be contained within a range not to impair the effects of the present invention, but the content of the other solvent is desirably 10% by mass or less in the treating agent of the present invention. . In particular, some amount of tetrahydrofuran (THF) may be contained, but from the viewpoint of not damaging the interior sheet, its content is preferably 5% by mass or less in the treating agent of the present invention.

  The treating agent of the present invention preferably contains a coloring agent. As the colorant, for example, in addition to known dyes and pigments, a toner containing a pigment or dye in a resin can be used. By including a coloring agent having the same or similar color as the interior sheet in the treatment agent of the present invention, the joint portion can be made inconspicuous and a floor structure or the like having an integrated appearance can be formed. Further, even when the seam treatment agent is not sufficiently filled, the treatment agent of the present invention can be easily refilled and a seam portion having a good finish can be formed. At this time, as described above, when the seam portion is formed smoothly by the volatile combination of the alcohol-based solvent and the ketone-based solvent, the seam portion becomes less noticeable, and a floor structure or the like having a more integrated appearance is formed. can do.

  Further, in the treating agent of the present invention, an additive added to a known or commercially available seam solution can be blended as necessary within a range not to impair the effects of the present invention. For example, stabilizers, fungicides, weathering stabilizers, surfactants, dispersants, thickeners, plasticizers, preservatives, rust inhibitors, antibacterial agents, antifreeze agents, defoamers, film-forming auxiliaries, Matting agents and the like can be mentioned. The stabilizer is blended for the purpose of preventing discoloration of the resin component at normal temperature, and examples thereof include a metal-based stabilizer containing lead, barium, zinc, calcium, tin and the like, and an organic stabilizer such as an epoxy plasticizer. Examples of the weather stabilizer include an ultraviolet absorber, a light stabilizer and the like.

  The treating agent of the present invention takes the form of a liquid composition as a resin solution, and its viscosity is not particularly limited as long as it has fluidity at room temperature, and can be appropriately adjusted according to a site to be applied. If the viscosity of the treating agent of the present invention is too low, the treating agent may be easily injected into the gap, but may easily flow out to the ground surface. On the other hand, when the viscosity of the treating agent of the present invention is too high, it is difficult to flow out to the ground surface, but it may be difficult to inject the treating agent into the gap. Therefore, in the treating agent of the present invention, the viscosity may be set to a specific range in consideration of balance. For example, when the interior sheet is a floor material or the like, the viscosity at 23 ° C. is generally 40 to 20,000 mPa · s, particularly preferably 50 to 10,000 mPa · s, and more preferably 70 to 1100 mPa · s. Is more preferable. Therefore, for example, it can be suitably set in the range of 100 to 1100 mPa · s, and for example, can be set to 70 to 300 mPa · s. Here, the viscosity (mPa · s) is measured at a temperature of 23 ° C. using a BII type viscometer (manufactured by Toki Sangyo Co., Ltd., model name “BHII”) at a rotation speed of 20 rpm. Value.

The TI value of the processing agent having low fluidity is not particularly limited. The TI value is the ratio of the viscosity under low shear to the viscosity under high shear. If the TI value is high, the fluidity is relatively low after injection of the seam treatment agent, so that the seam treatment agent does not easily flow out to the base surface. On the other hand, if the TI value is low, the fluidity is relatively high in the state after the injection, and the seam treatment agent easily flows out to the base surface. Therefore, it is not preferable to set a very low value. For this reason, the TI value is preferably set relatively high, but needs to be set in consideration of the balance with the above-mentioned viscosity value. For example, the TI value of the treatment agent is usually preferably 1.0 or more. In addition, the upper limit of the TI value of the treatment agent is not particularly limited, but is a practical value of 8.0 or less, and preferably 7.0 or less. In the present invention, the TI value is a value calculated by the following equation.
TI value = (viscosity measured at a rotation speed of 6 rpm) / (viscosity measured at a rotation speed of 60 rpm)
However, the viscosity used for calculating the TI value is measured using a BII type viscometer (manufactured by Toki Sangyo Co., Ltd., model name “BMII”) at a temperature of 23 ° C.

2. Production of the treating agent of the present invention The treating agent of the present invention can be obtained by uniformly mixing these components so that the vinyl chloride resin is dissolved in the organic solvent. The mixing method is not limited as long as the vinyl chloride resin is dissolved in the organic solvent, and can be implemented by using a known device such as a mixer or a kneader.

  The order of blending these components is not particularly limited as long as the vinyl chloride resin can be dissolved in the organic solvent. In particular, in the present invention, in particular, 1) a step of preparing a dispersion by dispersing a vinyl chloride resin in an alcohol solvent (dispersion step) and 2) a vinyl chloride by mixing the dispersion with a ketone solvent. The treatment agent of the present invention can be suitably produced by a production method including a step of obtaining a solution of a system resin (dissolution step).

  In the dispersion step, by using an alcohol-based solvent that is an organic solvent in which the vinyl chloride-based resin is not dissolved, the fine particles of the vinyl chloride-based resin can be highly dispersed in a liquid phase in advance. In particular, even when the vinyl chloride resin is a fine powder (for example, a particle diameter of 500 μm or less), a dispersion without lumps can be prepared using an alcohol solvent. Moreover, since the vinyl chloride resin is dispersed in the alcohol solvent before the dissolving step, the amount of the alcohol solvent used can be reduced. As a result, more efficient dissolution can be realized in the dissolving step. it can.

  In the dissolving step, the individual fine particles of the vinyl chloride-based resin in the dispersion are rapidly dissolved in the ketone-based solvent by mixing the ketone-based solvent, which is an organic solvent in which the vinyl chloride-based resin is dissolved, with the dispersion. .

  Thus, the treating agent of the present invention can be obtained. In other words, as the treating agent of the present invention, 1) a step of preparing a dispersion by dispersing a vinyl chloride resin in an alcohol solvent (dispersion step) and 2) mixing the dispersion with a ketone solvent. This makes it possible to suitably use a seam treatment liquid obtained by a production method including a step of obtaining a solution of a vinyl chloride resin (dissolution step).

  The vinyl chloride resin, organic solvent, and the like used in this production method are as described in 1. above. The same one as described in can be used. In addition, the amounts used of these are also the same as those in 1. What is necessary is just to carry out similarly to what was demonstrated in.

3. Seam treatment method The seam treatment method using the treatment agent of the present invention can be carried out according to a known seam treatment procedure, except that the treatment agent of the invention is used as a seam liquid. That is, the treatment agent of the present invention can be applied to any of the methods without using any special treatment conditions. Hereinafter, an embodiment in which a seam treatment of a vinyl chloride resin floor material as an interior sheet is performed using the treatment agent of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the plurality of flooring materials 1 a to 1 d are arranged on a base with the butting portions of the edges facing each other. In FIG. 1, four floor materials 1a to 1d are shown for convenience, but the floor material A is not necessarily limited to four, and may be two or more. In addition, in FIG. 1, each of the floor materials 1 a to 1 d is formed in a square shape in a plan view, but is not limited thereto. Can be selected. In addition, the plurality of flooring materials 1a to 1d have their edges formed in a straight line, but the edges may be formed in a curved line. Although it is difficult with conventional seam liquids to form gaps in the joint between curved shapes, it is difficult to use the treating agent of the present invention to fill the gaps and more reliably join, so it is also suitable for joining between curved shapes. Can be used for

  Abutting portions 2 are formed between the edges of each flooring 1a to 1d. The butting portion 2 is a slight gap generated between the butting end surfaces. That is, after the first floor material 1a is fixed on the base, the second floor material 1b is laid so that the butted end surface of the second floor material 1b is in contact with the butted end surface. In this case, the butted end faces are not necessarily in contact with each other over the entire edge portion, or the contacted portions are not so closely contacted that water does not leak. There is a slight gap through which moisture and the like pass. Such a gap is the butting portion 2 described above. If the width of the butted portion 2 is too large, it may be difficult to reliably join the butted portion. Therefore, the width of the butted portion 2 is usually 0 to 0.5 mm, preferably 0 to 0.3 mm.

  In the case where the width of the butting portion 2 is 0 mm, the butting end surfaces are in contact with each other and macroscopically, there is no gap, but microscopically, due to minute unevenness existing in the butting end surface, Since the contacting portions are not necessarily in close contact without water leakage, it is necessary to join the butted portions 2.

Seam processing method (first embodiment)
FIG. 2 is a schematic cross-sectional view showing an outline of the procedure for injecting the treatment agent of the present invention into the butted portion. In FIG. 2, 1) a step of laying a plurality of floor materials while forming an abutting portion with the edges of the floor material facing each other (floor laying step); A step of applying an adhesive tape over the surface (tape attaching step), 3) forming a cut line along the butt portion in the surface of the adhesive tape, and dividing the adhesive tape into a first region and a second region sandwiching the cut line (Incision line forming step), 4) a step of injecting the treatment agent of the present invention from the cut line into the butted portion (injection step), 5) a step of drying the injected treatment agent of the invention (drying step), and 6) A method including a step of peeling the pressure-sensitive adhesive tape from the floor material after the treating agent of the present invention has dried (peeling step) is shown.

1) Floor material laying step As described above, the floor materials 1a to 1d are laid on the surface of the groundwork (not shown) as shown in FIG. This step corresponds to FIG.

  At the time of laying the floor materials 1a to 1d, the first floor material 1a is fixed on the base using an adhesive or the like, and the edge of the second floor material 1b is joined to the end face of the edge of the first floor material 1a. And the second floor material 1b is fixed on the base. Thereafter, by repeating the same steps, a floor structure on which the plurality of floor materials 1a to 1d are laid is constructed. In this constructed floor structure (existing floor), the butted portion 2 is formed between the edges of the laid first floor material 1a and the second floor material 1b. The butted portion 2 of the existing floor is joined according to the following steps.

2) Tape Sticking Step As shown in FIG. 2 (b), in the present embodiment, an adhesive tape 3 is used as a masking tape, and the adhesive tape 3 is attached so as to straddle the butted portion 2 formed on the existing floor surface. .

  It is preferable that the pressure-sensitive adhesive tape 3 includes a band-shaped substrate and a pressure-sensitive adhesive layer provided on the back surface of the substrate.

  As the substrate in the adhesive tape 3, it is preferable to use a solvent-resistant substrate that is not easily eroded by the organic solvent in the treatment agent of the present invention. The substrate may be transparent, translucent or opaque. Examples of such a substrate include a laminated sheet in which a cloth sheet and a polyolefin sheet such as polyethylene or polypropylene are laminated; a polyolefin sheet such as polyethylene or polypropylene; a paper sheet such as cellulose fiber. Further, the base material is preferably one that can be stretched at least in the width direction. The pressure-sensitive adhesive tape 3 having extensibility in the width direction is expanded in the width direction by applying a force in the plane. In particular, it is preferable to use an adhesive tape having extensibility in the width direction and the longitudinal direction.

  Examples of the pressure-sensitive adhesive include a pressure-sensitive pressure-sensitive adhesive that exhibits tackiness at room temperature and that adheres to an adherend when pressed. Examples of the material of the adhesive include a rubber-based material and an acrylic-based material. The pressure-sensitive adhesive layer can be peeled off from the adherend without leaving the pressure-sensitive adhesive on the adherend, and can be re-applied. In addition, it is preferable to employ a solvent-resistant adhesive as the adhesive.

  The pressure-sensitive adhesive tape 3 is not particularly limited, and a known or commercially available adhesive tape can be used. As a commercially available product, for example, “Scotch Sealing and Masking Tape 80S” manufactured by 3M Japan Ltd. can be suitably used.

  As described above, the existing floor has the butt portion 2 between the butt end surfaces of the first floor material 1a and the second floor material 1b. As shown in FIG. 2B, the abutting portion 2 and the longitudinal direction of the band-shaped adhesive tape 3 are made substantially parallel to each other, and a single band-shaped adhesive tape 3 is closed so as to cover the upper opening of the abutting portion. The first floor material 1a and the second floor material 1b are attached over the surfaces of both floor materials while straddling the butt portion 2 between the two floor materials. In this case, an adhesive tape may be adhered to each butt portion of each flooring material. However, as shown in FIG. 5, a plurality of flooring materials are arranged so as to straddle the entire butting portion formed continuously. One adhesive tape 3 may be adhered. Note that FIG. 5 shows a state in which the adhesive tape 3 is attached so as to close the butt portion formed continuously in the vertical direction in the arrangement of the floor materials 1a to 1d shown in FIG. Thereafter, an adhesive tape may be applied so as to cover the butted portion 2 formed continuously in the lateral direction.

3) Cut line forming step As shown in FIG. 2C, a cut line 4 is formed in the adhesive tape along the butt portion 2 in the plane of the region on the butt portion 2 of the adhesive tape 3, and the cut line is formed. The adhesive tape 3 is divided into two areas sandwiching 4. The cutting line 4 can be formed by using a cutting tool such as a cutter or a roll cutter. Note that, instead of the blades, a jig (not shown) having a sharp tip may be used.

4) Injection Step As shown in FIG. 2D, the tip of the nozzle of the injection tool 5 filled with the treatment agent of the present invention is pushed into the butting portion 2 from the cut line 4 to inject the liquid treatment agent of the present invention into the butting portion 2. I do. The liquid treating agent 6 of the present invention, which has entered the butting portion 2, slowly swells or dissolves the vinyl chloride resin constituting the flooring materials 1a to 1b, and finally, the resin contained in the treating agent 6 of the present invention described later. Strong bonding is achieved by a synergistic effect with the curing of the components.

5) Drying Step As shown in FIG. 2 (e), after injecting the treating agent 6 of the present invention, the liquid is dried until the organic solvent contained in the treating agent 6 of the present invention is volatilized. As a result, the liquid treatment agent of the present invention dries, and the seam portion 7 is formed. Drying may be either natural drying or forced drying. In the case of forced drying, drying may be performed by blowing cold air or hot air with a blowing device such as a blower or a dryer, or drying while heating. In the case of natural drying, the drying time is, for example, about 5 to 20 minutes.

  In the process of drying the treating agent 6 of the present invention, the swollen or dissolved vinyl chloride resin constituting the floor materials 1a to 1b hardens, or the vinyl chloride resin constituting the floor materials 1a to 1b and the treating agent of the present invention 6 are hardened, and the edges of the first flooring 1a and the edges of the second flooring 1b are joined together through a joint 7 made of a cured body made of the treatment agent of the present invention, butted together. The parts are joined.

6) Adhesive Tape Peeling Step After the seam portion 7 is formed by drying and curing the treatment agent of the present invention, the adhesive tape 3 is removed from the first floor material 1a and the second floor material 1b while being peeled off. As shown in f), a floor structure in which the butted portions 2 are joined via the joints 7 is obtained.

  When the butting parts 2 are joined, the butting end face of the first floor material 1a and the butting end face of the second floor material 1b substantially disappear. For this reason, the obtained floor structure is excellent in water-sealing properties, and since the treating agent of the present invention hardly damages the floor material surface, it is possible to obtain an excellent aesthetic appearance free from dirt, damage and the like.

Seam processing method (second embodiment)
FIG. 3 shows an outline of another embodiment in which the treatment agent of the present invention is injected. In FIG. 3, 1) a step of laying a plurality of floor materials so that the edges of the floor materials face each other (floor laying step), 2) a step of injecting the treating agent of the present invention into the butted portion (injection step), 3) Before the injected treatment agent of the present invention cures, a step of applying an adhesive tape over the surfaces of both flooring materials (both interior sheets) so as to straddle the butt portion (tape attaching step); 4) Injection The method includes a step of drying the treated agent of the present invention (drying step) and 5) a step of peeling off the adhesive tape from the floor material after the agent of the present invention is dried (peeling off the adhesive tape).

  According to the method according to the second embodiment, an adhesive tape is applied across the surfaces of both flooring materials (both interior sheets) so as to straddle the abutting portion, particularly before the injected treating agent of the present invention is cured. Since the process includes a step, even if a surplus of the treating agent of the present invention overflows from the butt portion in the pouring step, the surplus can be easily removed by the adhesive tape after drying. Therefore, the seam processing can be performed relatively easily. Further, after the injection step and before the treatment agent of the present invention is completely dried and cured, the adhesive tape serves as a protective layer, which can effectively prevent dust, sand and the like from adhering to the injection part. Therefore, even if the treatment agent of the present invention is hardly stepped on, for example, by a human before the treatment agent is completely dried and cured, it can contribute to, for example, shortening the construction period and increasing the efficiency.

  The floor material laying step in the second embodiment can be performed in the same manner as the floor material laying step in the first embodiment, as shown in FIG. The implantation step in the second embodiment can be performed in the same manner as the implantation step in the first embodiment except that no masking is performed as shown in FIG. The tape attaching process in the second embodiment is performed before the injected seam treating agent is cured as shown in FIGS. 3C to 3D, except that the tape attaching process is performed in the first embodiment. Can be carried out in the same manner as in the tape sticking step. The drying process in the second embodiment is performed in the same manner as the drying process in the first embodiment, except that the drying process is performed in a state where an adhesive tape is adhered, as illustrated in FIG. Can be. The pressure-sensitive adhesive tape peeling step in the second embodiment can be performed in the same manner as the pressure-sensitive adhesive tape peeling step in the first embodiment, as shown in FIG. However, in the pressure-sensitive adhesive tape peeling step in the present embodiment, there is an advantage that an excess (unnecessary portion) of the injected treating agent of the present invention that overflows the surface of the interior sheet (floor material) can be removed.

  In particular, in the tape sticking step of the second embodiment, it is preferable to use, for example, an adhesive tape having a paper sheet as a base material, from the viewpoint that drying and curing of the treating agent of the present invention can be further promoted. As the paper sheet, similarly to the case of the first embodiment, a paper sheet of cellulose fiber or the like can be suitably used. A paper sheet is preferable because it has a high air permeability so that drying of the seam-treating agent is accelerated. However, even a resin sheet having a high air permeability can be expected to have the same effect as a paper sheet.

Joint processing method (third embodiment)
FIG. 4 shows an outline of the third embodiment. In FIG. 4, 1) a step of laying a plurality of floor materials so that edges of the floor materials face each other (floor laying step) (FIG. 4 (a)); Step of turning over at least one of the materials and injecting the treatment agent of the present invention into a region corresponding to the abutting portion (injection step) (FIG. 4B), 3) Before the injected treatment agent of the present invention is cured, A step of applying an adhesive tape over the surfaces of both floor materials so as to straddle the butted portion (tape attaching step) (FIG. 4 (d)), 4) a step of drying the injected treating agent of the present invention (drying step) and 5) A method including a step of peeling the pressure-sensitive adhesive tape from the floor material after the treatment agent of the present invention is dried (pressure-sensitive adhesive tape peeling step) (FIG. 4E) is shown. The third embodiment is substantially the same as the second embodiment except that the flooring is turned in the pouring step.

  According to the third embodiment, since the application of the joint treatment agent is facilitated, it is possible to contribute to an improvement in work efficiency. Further, since it is easy to visually confirm whether or not the seam treatment agent has been sufficiently applied, it is also possible to effectively reduce work mistakes such as, for example, residual coating and insufficient coating. Since the application amount of the seam treatment agent can be increased, it is possible to more reliably fill the butted portion. Furthermore, since a high-viscosity seam-treating agent can be used without any trouble, the degree of freedom in seam-treatment design is increased.

  In the third embodiment, in the injection step, at the time of injecting the treatment agent of the present invention, at least one of the floor materials facing each other is turned over, and the treatment agent of the present invention is injected into the region 8 corresponding to the abutting portion. In this case, one of the flooring materials is usually turned.

  The region 8 corresponding to the butt portion is not particularly limited as long as the butt portion can be joined, and may be, for example, the butt surface (side surface) of one unturned floor material or its periphery, or both floors. When the material is turned over, it may be any surface such as a base surface on which the butted portion is arranged.

  Hereinafter, examples and comparative examples are shown, and the features of the present invention will be described more specifically. However, the scope of the present invention is not limited to the examples.

Example 1-1
As a resin component, in Example 1-1, a powdery vinyl chloride-vinyl acetate resin (product name “SOLVINE M5R” manufactured by Nissin Chemical Industry Co., Ltd., vinyl chloride content: 76.3% by mass, vinyl acetate content: 23) Mass%, dicarboxylic acid content 0.7 mass%, particle size 100-120 μm), and after mixing this resin component and ethanol, methyl ethyl ketone (MEK) is added to dissolve the vinyl chloride-vinyl acetate copolymer. By doing so, a resin solution was prepared.
Next, a pigment (manufactured by Dainichi Seika Kogyo Co., Ltd.), an antibacterial and antifungal agent (product name "Deniside BF-1" manufactured by Nagase ChemteX Corporation), a plasticizer (diisononyl phthalate (DINP)) were added to the obtained resin solution. )) And a stabilizer (product name "SB-35" manufactured by Tokyo Fine Chemical Co., Ltd.) to obtain a seam treatment agent, and the ratio of each component in the treatment agent is shown in Table 1. The unit of the numerical value in each component in 1 is mass%.

Example 1-2
Using a liquid polyurethane resin (product name "NL2249E" manufactured by Mitsui Chemicals, Inc., resin content 30%, solvent content (ethyl acetate / IPA) 70%), and after mixing this resin component and ethanol, methyl ethyl ketone (MEK) is added. A seam treating agent was obtained in the same manner as in Example 1-1, except that a resin solution was prepared by dissolving the resin component.

Example 1-3
After using a liquid vinyl acetate-alkyl acrylate resin (product name "Sebian A800" manufactured by Daicel Chemical Co., Ltd., resin content: 45 to 50%, solvent content (methanol): 45 to 50%), this resin component is mixed with ethanol. , Methyl ethyl ketone (MEK) was added, and a resin solution was prepared by dissolving the resin component, to obtain a seam treating agent in the same manner as in Example 1-1.

Example 1-4
Using a solid polyester resin (product name "Byron 500" manufactured by Toyobo Co., Ltd.), this resin component was mixed with ethanol, and then methyl ethyl ketone (MEK) was added to dissolve the resin component to prepare a resin solution. Otherwise, a seam treating agent was obtained in the same manner as in Example 1-1.

Example 1-5
Using a powdery butyral resin (product name "ESLEC BL-1" manufactured by Sekisui Chemical Co., Ltd.), mixing this resin component with ethanol, adding methyl ethyl ketone (MEK), and dissolving the resin component A seam treating agent was obtained in the same manner as in Example 1-1, except that a resin solution was prepared.

Example 1-6 to Example 1-10
As a resin component, a powdery vinyl chloride-vinyl acetate resin (product name “SOLVINE M5R” manufactured by Nissin Chemical Co., Ltd., vinyl chloride content 76.3% by mass, vinyl acetate content 23% by mass, dicarboxylic acid content (0.7% by mass, particle size of 100 to 120 μm), this resin component is mixed with ethanol, and then methyl ethyl ketone (MEK) and acetone are added to dissolve the vinyl chloride-vinyl acetate copolymer. Was prepared.
Next, a pigment (manufactured by Dainichi Seika Kogyo Co., Ltd.), an antibacterial and antifungal agent (product name "Deniside BF-1" manufactured by Nagase ChemteX Corporation), a plasticizer (diisononyl phthalate (DINP)) were added to the obtained resin solution. )) And a stabilizer (product name “SB-35” manufactured by Tokyo Fine Chemical Co., Ltd.) to obtain a joint treatment agent, and the ratio of each component in the treatment agent is shown in Table 2. The unit of the numerical value for each component in 2 is mass%.

Example 1-7 to Example 1-10
A seam treating agent was prepared in the same manner as in Example 1-6, except that the composition was as shown in Table 2.

Comparative Example 1-1
A seam treating agent was prepared in the same manner as in Example 1-1, except that methylene chloride was used instead of the mixed solvent of ethanol and methyl ethyl ketone.

Test Example 1-1
With respect to the seam-treating agents obtained in Example 1-1 to Example 1-10 and Comparative Example 1-1, the solubility of a vinyl chloride-vinyl acetate copolymer as a resin component was visually observed. The results are shown in Tables 1 and 2.
The evaluation result was evaluated as “x” when the resin component was not sufficiently dispersed and could be confirmed as an aggregate (dama), and “o” when the presence of the aggregate was not recognized as described above. The results are shown in Tables 1 and 2. As is clear from the results of Tables 1 and 2, no lumps were observed in any of the joint treatment agents, and it was found that almost all resin components were dissolved in the organic solvent.

Test Example 1-2
The seam treatment was performed according to the first embodiment using the seam treating agents of Examples 1-1 to 1-10 and Comparative Example 1-1. A commercially available floor material was used as the interior sheet. This floor material is formed with a protective layer (thickness: 20 μm) containing a urethane acrylate solventless UV curable resin (product name “Aurex NO.145TK” manufactured by China Paint Co., Ltd.). The size of one flooring material is 300 mm long × 100 mm wide × 2 mm thick (including the thickness of the protective layer).
The vertical edges of the two flooring materials were butted against each other, and after the seam treatment agent was injected into the butted portion, an adhesive tape was applied before the seam treatment agent was cured (that is, within 5 minutes after the injection). After a certain period of time, the adhesive tape was slowly peeled off with fingers. In that case, 1) the presence or absence of damage on the floor material surface and 2) the presence or absence of the seam treatment agent remaining on the floor material surface were visually evaluated. The results are shown in Tables 1 and 2.
In the evaluation of 1) above, “○” indicates that no damage (erosion) is observed on the floor material surface, “△” indicates that there is no noticeable damage on the floor material surface but slight discoloration, and “△” indicates that the floor material surface is slightly discolored. Was evaluated as "x" when damage due to dissolution was observed.
In the evaluation of the above 2), when the seam treatment agent did not remain on the flooring material surface, "O", when the seam treatment agent partially remained, "一部", (The case where the seam-treating agent on the floor material surface was hardly removed by the adhesive tape) was evaluated as “x”.

Example 2-1
As a resin component, a powdery vinyl chloride-vinyl acetate copolymer (product name “SOLVINE M5R” manufactured by Nissin Chemical Industry Co., Ltd., vinyl chloride content 76.3% by mass, vinyl acetate content 23% by mass, dicarboxylic acid) This resin component is mixed with ethanol using a content of 0.7% by mass and a particle size of 100 to 120 μm), and then methyl ethyl ketone (MEK) is added thereto to dissolve the vinyl chloride-vinyl acetate copolymer. Was prepared. A seam treating agent was obtained by adding a pigment (manufactured by Dainichi Seika Kogyo Co., Ltd.) and an antibacterial / antifungal agent (product name "DENICIDE BF-1" manufactured by Nagase ChemteX Corporation) to this resin solution. The proportion of each component in the obtained treating agent is shown in Table 3. The unit of the numerical value of each component in Table 3 is% by mass.

Examples 2-2 to 2-4
A seam treating agent was prepared in the same manner as in Example 2-1 except that the mixing ratio of each component was changed as shown in Table 3.

Comparative Example 2-1
A seam treating agent was prepared in the same manner as in Example 2-1 except that ethanol was not used.

Test Example 2-1
With respect to the seam treating agents obtained in Example 2-1 to Example 2-4 and Comparative Example 2-1, the solubility of a vinyl chloride-vinyl acetate copolymer as a resin component was visually observed. The evaluation result was evaluated as “x” when the resin component was not sufficiently dispersed and could be confirmed as an aggregate (dama), and “o” when the presence of the aggregate was not recognized as described above. Table 3 shows the results.
As is clear from the results in Table 3, lump was generated in Comparative Example 2-1 not using ethanol, while lump was confirmed in the seam treating agents according to Example 2-1 to Example 2-4. However, it was found that almost all the resin components were dissolved in the organic solvent.

Comparative Example 2-2
A seam treating agent was prepared in the same manner as in Example 2-1 except that THF was used instead of the mixed solvent of ethanol and methyl ethyl ketone.

Test Example 2-2
The surface properties when the seam-treating agents of Example 2-1 and Comparative Example 2-2 were applied to a vinyl chloride resin were observed. The test method was performed by a procedure in which 2 g of a seam treatment agent was dropped on the surface of a sheet made of a vinyl chloride resin, covered with a watch glass, allowed to stand for 30 minutes, and then visually checked for the state of the sheet surface. The evaluation was made by visually observing the surface of the vinyl chloride resin. As a result, no damage (erosion) due to dissolution was observed on the surface of the vinyl chloride resin. Is recognized as "x". Table 4 shows the results.

  As is clear from the results in Table 4, in Comparative Example 2-2 using THF as an organic solvent, the vinyl chloride resin was strongly dissolved and the surface was damaged, whereas the seam treatment in Example 2-1 was performed. It can be seen that the agent does not cause such damage.

Example 2-5
As a resin component, a vinyl chloride-vinyl acetate copolymer (product name "Solvain M5" manufactured by Nissin Chemical Industry Co., Ltd., vinyl chloride content 86.0% by mass, vinyl acetate content 13.4% by mass, dicarboxylic acid content Except for using 0.6% by mass), a joint treatment agent was prepared in the same manner as in Example 2-1.

Test Example 2-3
The vinyl chloride resin floor material sheets were joined using the seam treating agents of Example 2-1 and Example 2-5, and the breaking strength was measured. The measurement sample of the breaking strength was obtained by subjecting a vinyl chloride resin flooring sheet to a seam treatment, leaving it to stand for 7 days, and cutting (25 mm width) 90 degrees from the seam. The breaking strength was measured by pulling the joint in the direction of 90 degrees. Table 5 shows the results.

  As is clear from the results in Table 5, the higher the vinyl acetate content of the vinyl chloride-vinyl acetate copolymer (Example 2-1), which is the resin component of the seam-treating agent, can achieve higher breaking strength. I understand. As described above, in the present invention, a higher breaking strength can be obtained by setting the vinyl acetate content of the vinyl chloride-vinyl acetate copolymer particularly in the range of 20 to 25% by mass.

Examples 2-6 to 2-16
A seam treating agent having the composition shown in Table 6 was prepared according to the procedure of Example 2-1. The viscosity at 23 ° C. of the obtained seam treating agent was measured. Table 6 shows the results. The unit of the numerical value of each component in Table 6 is% by mass.

Test Example 2-4
The seam treatment was performed using the seam treating agents of Examples 2-6 to 2-16. The vertical edges of two commercially available vinyl chloride flooring materials (300 mm long x 100 mm wide x 2 mm thick) are butted against each other so that the gap is 0.0 mm and 0.2 mm, and the seam treatment agent is applied to the butted portion. After injecting and drying and curing, the filling property of the gap (state of the gap) was visually observed. The evaluation was evaluated as “」 ”when the gap was sufficiently filled,“ △ ”when the gap was almost completely filled, and“ × ”when the gap could still be confirmed to exist. Table 6 shows the results.
As is clear from the results in Table 6, according to the seam treating agents of Examples 2-6 to 2-16 according to the treating agent of the present invention, the predetermined viscosity can be maintained, and as a result, the butt portions of the floor materials are joined. Can be filled without gaps.

Claims (5)

A seam treatment agent used for filling a butt portion between interior sheets mainly composed of a vinyl chloride resin,
(1) The treatment agent is a liquid composition containing a vinyl chloride resin and an organic solvent,
(2) a vinyl chloride resin is dissolved in an organic solvent,
(3) the organic solvent includes a ketone-based solvent and an alcohol-based solvent ,
(4) The ketone solvent is a mixture of a) methyl ethyl ketone or b) methyl ethyl ketone and another ketone solvent, and the alcohol solvent is at least one of methanol, ethanol, normal propyl alcohol and isopropyl alcohol. is there,
A seam treating agent, characterized in that: The seam treating agent according to claim 1, wherein the vinyl chloride-based resin includes a vinyl chloride-vinyl acetate-based copolymer. The seam treating agent according to claim 1, wherein the content of tetrahydrofuran in the organic solvent is 10% by mass or less. The seam treating agent according to claim 1, wherein the content of the alcohol-based solvent is 10 to 25% by mass in the seam treating agent. The seam treating agent according to claim 1, wherein the ketone-based solvent is included in an amount of 150 to 350 parts by mass based on 100 parts by mass of the alcohol-based solvent.