JP4584562B2 - Adhesive composition for flooring and combing iron used for applying the same - Google Patents

Description

The present invention relates to an organic solvent type adhesive composition for applying a flooring and a comb eyelet used for applying the same .

  Conventionally, adhesive compositions for pasting flooring of buildings include adhesive resins such as vinyl acetate resin and urethane resin, aromatic solvents such as toluene and xylene, esters such as butyl acetate and ethyl acetate. An adhesive composition diluted in a so-called volatile solvent selected from a system solvent and a ketone system solvent such as methyl isobutyl ketone (MIBK) and methyl ethyl ketone (MEK) has been used.

  Certainly, these adhesive compositions have no problem in terms of volatility, but the organic solvent that volatilizes during construction can cause odors and cause discomfort to the installer, or can be highly toxic or cause sick house syndrome. There were problems in terms of safety. Therefore, an adhesive composition using dimethyl carbonate as a solvent is disclosed as a safer solvent.

However, although the adhesive composition using dimethyl carbonate as a solvent is high in safety, it is inferior to the workability of application compared to an adhesive composition using a conventional volatile solvent, and has a long open time. Improvements were desired in terms of work characteristics, such as being inferior in terms of finish.
JP-A-9-279110

The present invention has been made in view of the above-mentioned problems. When dimethyl carbonate is used as a solvent, the adhesive composition for flooring excellent in various work characteristics and comb eyes used for applying the same. The main purpose is to provide services.

The adhesive composition for flooring of this invention consists of a urethane resin, an inorganic filler, and dimethyl carbonate, The mixture ratio of this dimethyl carbonate is 0.1-20 weight%, It is characterized by the above-mentioned. The comb iron used to apply the above composition has a comb peak of 1.65 to 2.05 mm and a comb width of 1.55 to 1.95 mm, and is isosceles with a high comb peak compared to the comb width. Triangular comb-shaped portions are provided with a plurality of end portions formed at regular intervals with a pitch of 3.25 to 4.05 mm.

According to the adhesive composition for flooring of the present invention, it comprises a urethane resin, an inorganic filler, and dimethyl carbonate, and since the blending ratio of the dimethyl carbonate is 0.1 to 20% by weight, it is excellent in coating workability. The open time is shortened and the finish after the flooring is applied is excellent. According to the comb iron of the present invention, the open time can be shortened and the initial adhesive force can be improved.

  The adhesive composition for flooring of the present invention comprises an adhesive resin, an inorganic filler, and dimethyl carbonate, and contains a specific amount of the dimethyl carbonate.

  Examples of the flooring material used as the adherend of the adhesive composition of the present invention include building finishing materials such as polymeric upholstery flooring materials and tile carpet wood type flooring materials. Examples of polymeric flooring materials include composition vinyl floor tiles, homogeneous vinyl floor tiles, vinyl floor sheets, linoleum floor sheets, linoleum floor tiles, olefin floor sheets, olefin floor tiles, rubber tiles, and vinyl floors. Materials, linoleum flooring, rubber flooring and the like. It is also suitable for artificial grass.

  The adhesive resin is not particularly limited as long as it is a synthetic resin that dissolves in dimethyl carbonate, which will be described later, and has adhesiveness. For example, urethane resin, epoxy resin, (modified) vinyl acetate resin, synthetic rubber, acrylic resin, etc. Is mentioned. Among these, urethane resin and acrylic resin are preferably used from the viewpoint of excellent kneadability with each component of the adhesive composition.

  Although the blending ratio of the adhesive resin is not particularly limited, it is usually 20 to 20% of the entire adhesive composition from the viewpoint of excellent application workability, shortening of open time, and excellent finishability of the obtained adhesive composition. It is appropriately selected and used within the range of 80% by weight.

  Here, the application workability is a concept including both ease of application of the adhesive composition and the state of the applied adhesive composition. That is, the workability of application is such that the viscosity is low when the adhesive composition is applied to the base material using a comb iron, and the comb formed after coating is less likely to collapse (that is, less likely to level). Rated as preferred. The open time is the time required for the initial adhesive force to reach 100 gf / 25 mm after the flooring is applied to the base material coated with the adhesive composition. From the viewpoint of work characteristics, the open time is short. It is evaluated as preferable. Further, the finish is evaluated as being preferable as the flooring material has less so-called push-up or blistering after the completion of construction. Such push-up is formed when the solvent in the adhesive composition is transferred in a large amount into the flooring material and the swelling of the flooring proceeds.

  The urethane resin is not particularly limited as long as it is publicly known as an adhesive application. For example, the urethane resin is produced by a known method using polyol, isocyanate, and optionally a chain extender or other known components as raw material components. can do.

  Examples of the polyol include polyether polyols and polyester polyols. Examples of the polyether polyol include polyoxyethylene diol, polyoxypropylene diol, polyoxybutylene diol, polytetramethylene diol, and polyoxyethylene triol. , Polyoxypropylene triol, castor oil-modified polyol, epoxy-modified polyol, and the like. These can be used alone or in combination of two or more. Examples of the polyester polyol include polyethylene adipate glycol, polypropylene adipate glycol, polyethylene butylene adipate glycol, polyneopentyl sebacate glycol, and the like. These can be used alone or in combination of two or more.

  Examples of the isocyanate include methylene diisocyanate, ethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate (HDI), dodecamethylene diisocyanate, lysine diisocyanate, 4,4′-diphenylmethane diisocyanate (MDI), 2,4, or 2,6-trimethyl. Diisocyanate (TDI), isophorone diisocyanate (IPDI), xylylene diisocyanate (XDI), 1,5-naphthalene diisocyanate (NDI), polyphenylmethane polyisocyanate (crude MDI), diisocyanate dimer or trimer, etc. These may be used alone or in combination of two or more.

  Examples of the chain extender include diols such as ethylene glycol, propylene glycol, neopentyl glycol, 1,4-butanediol, 1,6-hexanediol, ethylenediamine, 1,2-propanediamine, 1,6-hexamethylene. Examples thereof include diamines, and these can be used alone or in combination of two or more.

  The inorganic filler is not particularly limited as long as it is excellent in kneadability with each component of the adhesive composition and exhibits excellent application workability in the obtained adhesive composition, for example, surface treatment Calcium carbonate, calcium carbonate, carbon black, mica, talc, clay, titanium oxide, zeolite, diatomaceous earth, silica (hydrophilic / hydrophobic), rubber powder, (organic / inorganic) balloon, etc. Two or more kinds can be mixed and used. That is, when the above inorganic filler is blended, the thixotropy of the resulting adhesive composition is increased, and the comb formed when applied with a comb iron is less likely to collapse. Will be demonstrated.

  The blending ratio of the inorganic filler is preferably 30 to 60% by weight, and more preferably 40 to 55% by weight, from the viewpoint of exhibiting the economical efficiency of the obtained adhesive composition and excellent coating workability.

  Dimethyl carbonate is preferably 0.1 to 20% by weight as a blending ratio in the adhesive composition from the viewpoint of excellent finish by shortening the open time of the obtained adhesive composition and optimizing the pasting time. %, More preferably 5 to 19% by weight, particularly preferably 7 to 18% by weight. Here, the pasting time refers to the time required for the transfer rate of the adhesive composition to the floor material to reach 50% as measured from the open time. Although it is generally evaluated that the pasting time is preferably longer, it is not preferable that the pasting time is too long because the finish tends to be inferior. That is, there is a strong correlation between the pasting time and the finish, and from the viewpoint of improving the finish, it is required to optimize the pasting time. In the present invention, 60 to 90 minutes are evaluated as appropriate as the pasting time.

  The adhesive composition of the present invention may optionally contain acetone from the viewpoint of volatilizing dimethyl carbonate in a shorter time during construction. In the case of using acetone, the blending ratio is preferably 2 to 10% by weight, more preferably 2 to 9% in the adhesive composition from the viewpoint of improving the volatility of dimethyl carbonate and the economics of the resulting adhesive composition. % By weight, particularly preferably 2 to 8% by weight.

  The adhesive composition of the present invention includes, for example, a stabilizer, an adhesion promoter, a curing agent, a curing accelerator, a plasticizer, a thixotropic agent, in addition to the above-described components, as long as the object of the present invention is not impaired. You may contain well-known additives, such as an agent, a pigment, and antioxidant.

  The adhesive composition of the present invention is produced by uniformly kneading an adhesive resin as an essential component, an inorganic filler and dimethyl carbonate, and optionally acetone and / or the above-mentioned various additives.

  Here, when a urethane resin is used as the adhesive resin, from the viewpoint of facilitating handling when the inorganic filler is kneaded, dimethyl carbonate and, if necessary, acetone are added to the urethane resin and stirred to impart fluidity. The obtained liquid urethane resin and the inorganic filler are preferably kneaded using a known kneader. At this time, if the inorganic filler is added with dimethyl carbonate and, if desired, acetone and stirred to impart fluidity, handling properties when kneading can be further enhanced.

  In pasting the flooring using the adhesive composition, a predetermined amount of the adhesive composition is applied to the base material using an application tool, and the flooring is sequentially pasted after the open time has elapsed.

  Here, a comb eye is usually used as the application tool. As the comb iron, for example, a comb iron defined in JIS A 5536, that is, a regular triangle comb forming portion 2 having a comb mountain (a) of 2.0 mm and a comb width (b) of 2.0 mm. However, it is possible to use a comb iron 1 having end portions formed at a regular interval with a pitch (c) of 5.0 mm (see FIG. 1).

  Further, from the viewpoint of shortening the open time and improving the initial adhesive strength, the formation of triangular combs having a comb mountain (a) of 1.65 to 2.05 mm and a comb width (b) of 1.55 to 1.95 mm A comb eye with a plurality of end portions formed at equal intervals at a pitch (c) of 3.25 to 4.05 mm may be used as the portion 2. That is, compared to the former comb iron, the latter comb iron is an isosceles triangle having a higher comb peak than the comb width, so that the inside of the comb pile formed after applying the adhesive composition The solvent such as dimethyl carbonate tends to volatilize and the pitch (c) is small, so the surface area of the applied adhesive composition is increased by that amount, which further improves the volatility of the solvent such as dimethyl carbonate. Will do.

  Here, the initial adhesive strength means 90-degree peel adhesion strength after 10 minutes and 30 minutes after applying the adhesive composition to the base material using a comb eyelet, and at each time passage The larger the 90-degree peel adhesive strength as an absolute value, the higher the initial adhesive strength, and the better the evaluation. Both the open type and the initial adhesive strength have a strong correlation with the volatility of the solvent, and the use of the latter comb iron improves the volatilization performance of the solvent, thereby reducing the open time. The initial adhesive force can be improved.

  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 these examples. Various characteristics were measured by the following methods. In this embodiment, “parts” means parts by weight.

(90 degree peel strength)
Apply slate plate specified in JIS A 5430 as a base material, vinyl floor sheet (PVC sheet) 25 mm in width specified in JIS A 5705 as a flooring material, and apply according to JIS A 5536 with diagonally raised irons. To measure. In the subsequent tests, the same base material and flooring material are used.

(Open time)
Using a comb iron, the adhesive composition is applied to a slate plate and a PVC sheet is immediately attached, and the peel adhesive strength is measured every 10 minutes after 10 minutes. The time when the 90-degree peel adhesion strength reaches 100 gf / 25 mm is defined as the open time. The measurement is performed 10 times at 25 ° C., and the minimum and maximum values are displayed.

(Initial adhesive strength)
Using a comb iron, the adhesive composition is applied to a slate plate, and a PVC sheet is immediately attached, and the 90 ° peel adhesive strength after 10 minutes and 30 minutes is measured. The measurement is performed 10 times at 23 ± 2 ° C. and 50 ± 10% RH, and the average value is displayed.

(Attachable time)
The time required for the transfer rate of the adhesive composition to the PVC sheet to reach 50% is measured from the open time. The measurement is performed 10 times at 25 ° C., and the minimum and maximum values are displayed.

(Coating workability)
In each of the above tests, when the adhesive composition is repeatedly applied to the base material using a comb iron, the working efficiency does not decrease and it is easy to apply, or 10 combs are formed after the application. It was evaluated from the viewpoint of whether it would not collapse more than a minute. The evaluation is ◯ when the coating workability is excellent, Δ when the coating workability is normal, and x when the coating workability is poor.

(finish)
Apply the adhesive composition to the slate plate using a comb iron and immediately apply the PVC sheet, then fix the two sides with an instantaneous adhesive and cut the middle of the flooring parallel to the two sides. When 24 hours passed, it was observed whether the PVC sheet was flat or not.

(Production example of urethane resin)
200 g of polybutylene adipate diol (weight average molecular weight 2000), 200 g of polyoxypropylene diol (weight average molecular weight 2000) and 83.2 g of neopentyl glycol are mixed, and 209 g of tolylene diisocyanate (TDI) is added thereto. A urethane resin was obtained by reacting at 80 ° C. for 5 hours in a nitrogen atmosphere.

(Production example 1 of liquid urethane resin)
223.4 g of dimethyl carbonate, 44 g of “Coronate 1040” (manufactured by Nippon Polyurethane Industry Co., Ltd.) and “Coronate HX” (manufactured by Nippon Polyurethane Industry Co., Ltd.) as the curing agent, and “Millionate” as the adhesion promoter 11.3 g of “MTL” (manufactured by Nippon Polyurethane Industry Co., Ltd.), 0.69 g of “Millionate MR-100” (manufactured by Nippon Polyurethane Industry Co., Ltd.) as stabilizer, and 0.01 g of “Sand Stub P-EPQ” as antioxidant In addition, by diluting, a liquid urethane resin A having an adhesive resin content of 78% was obtained.

(Production example 2 of liquid urethane resin)
Instead of dimethyl carbonate used in Production Example 1 of the liquid urethane resin, 223.4 g of toluene / ethyl acetate = 1/3 (w / w) was added and diluted to obtain a liquid urethane resin having an adhesive resin content of 78%. B was obtained.

(Production Example 1 of Adhesive Composition)
45 parts of an inorganic filler (clay / silica = 1/1 (w / w)), 5 parts of dimethyl carbonate and 5 parts of acetone, respectively, and 45 parts of the obtained kneaded product and the liquid urethane resin A, respectively. An adhesive composition A was obtained by kneading.

(Production Example 2 of Adhesive Composition)
An adhesive composition B was obtained by kneading 96 parts of the liquid urethane resin A and 4 parts of acetone.

(Production Example 3 of Adhesive Composition)
30 parts of an inorganic filler (clay / silica = 1/1 (w / w)) and 31.5 parts of dimethyl carbonate are kneaded, and 38.5 parts of the obtained kneaded product and the liquid urethane resin A are kneaded. Thus, an adhesive composition C was obtained.

(Production Example 4 of Adhesive Composition)
47 parts of inorganic filler (clay / silica = 1/1 (w / w)), 3 parts of acetone, 0.9 part of toluene and 10.6 parts of ethyl acetate, Adhesive composition D was obtained by kneading 38.5 parts of the liquid urethane resin B.

(Examples 1 and 2 and Comparative Examples 1 to 4)
By applying the adhesive composition using any one of the following two types of comb irons, the coating workability, open time, initial adhesive strength, pasting time, finish, and the like were evaluated.
≪Combine eye≫
JIS specified product; comb eye specified in JIS A 5536. Comb 2.0 mm, comb width 2.0 mm, pitch 5.0 mm.
Product of the present invention; comb eyes newly developed in the present invention. Comb mountain 1.85 mm, comb width 1.75 mm, pitch 3.65 mm.

  The results are shown in Table 1. In addition, the compounding quantity of each component in Table 1 has shown the quantity contained in the last adhesive composition.

  From the results of Table 1, compared with Comparative Examples 1 and 2, Examples 1 and 2 are excellent in coating workability, have a short open time, excellent initial adhesive strength, and are able to optimize the time for tensioning. It was found that the finish after applying the material was also excellent.

It is a front view which shows a comb eye iron and its edge part.

Explanation of symbols

1 Comb iron 2 Comb eye forming part

Claims (1)

Comb iron used for applying an adhesive composition for flooring , comprising a urethane resin, an inorganic filler and dimethyl carbonate, wherein the blending ratio of the dimethyl carbonate is 0.1 to 20% by weight. It has a mountain 1.65~2.05mm and comb width 1.55～1.95Mm, the comb tooth forming portions of Kushiyama high isosceles triangle than the comb width, pitch from 3.25 to 4. Comb eye with end parts formed at a regular interval of 05 mm.

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