JP2006176727A - Adhesive for floor board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a one-liquid type adhesive for a floor board excellent in workability, wherein peeling-off of a synthetic resin material for a floor board can easily be conducted with a simple procedure without giving damage to the material and a subfloor and thus the peeling-off material itself can be recycled. <P>SOLUTION: The adhesive comprises 100 pts.wt. of a composition containing 20-70 wt% of a rubbery polymer containing no functional group reactive with an isocyanate group and 80-30 wt% of a sticking resin forming no network structure by reacting with an isocyanate group, and 6-30 pts.wt. of an isocyanate compound. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a pressure-sensitive adhesive for floors, and in particular, allows a synthetic resin floor material to be easily peeled off without requiring labor, and without damaging the peeled synthetic resin floor material or floor substrate. The present invention relates to a floor pressure-sensitive adhesive that is one-part and excellent in workability while being reusable.

  Conventionally, synthetic resin flooring has been used with an adhesive on the floor base so that the synthetic resin flooring does not slip, peel off or bulge by walking on it. I was trying to stick firmly.

  However, if the synthetic resin flooring is firmly attached to the floor base using an adhesive, the synthetic resin flooring can be removed when the synthetic resin flooring is removed or replaced during maintenance. There is a problem that it takes time to peel off the flooring material, and the flooring material and the floor base made of synthetic resin are damaged and it is difficult to reuse the flooring material as it is.

In order to cope with such problems, floor adhesives that are used for indoor floors and carpeted on floors have been put to practical use as floor adhesives that are relatively loosely attached to carpet floors ( For example, see Patent Document 1).
JP 2002-188072 A

  However, the conventional adhesive for floors consists of a two-component curable composition comprising a component having a functional group that reacts with isocyanate as a main component and an isocyanate compound, so that both of them are completely in an accurate ratio. There is a problem in terms of workability and the like, for example, it is necessary to mix the pressure-sensitive adhesive once mixed in a short time.

  In view of the problems of the conventional floor pressure-sensitive adhesive, the present invention makes it possible to easily remove the synthetic resin floor material without trouble, and to remove the peeled synthetic resin floor material and floor base. An object of the present invention is to provide a floor pressure-sensitive adhesive that is one-component and excellent in workability while being reusable as it is without being damaged.

  In order to achieve the above object, the pressure-sensitive adhesive for floors of the present invention is a tackifying resin that does not form a network structure by reacting with a rubber-like polymer 20 to 70 wt% having no functional group that reacts with an isocyanate group and an isocyanate group. 6 to 30 parts by weight of an isocyanate compound is blended with 100 parts by weight of a composition composed of 80 to 30 wt%.

  Examples of the rubbery polymer include styrene butadiene styrene block copolymer (SBS), styrene butadiene rubber (SBR), styrene isoprene styrene block copolymer (SIS), styrene ethylene butylene styrene block copolymer (SEBS), and isoprene. One type or two or more types such as rubber (IR) and butyl rubber (IIR) can be used.

  Examples of tackifying resins include petroleum resins, terpene hydrocarbon resins, coumarone indene resins, ketone resins, and rosin esters having an average number of functional groups per molecule of functional groups that react with isocyanate groups of 1.0 or less. 1 type, or 2 or more types, such as resin, can be used.

  Examples of isocyanate compounds include diisocyanate compounds, uretidine dione dimerization products of diisocyanate compounds, biuret type trimerization products, isocyanurate type trimerization products, adducts with polyols, triisocyanate compounds and polymeric polyisocyanate compounds. 1 type (s) or 2 or more types can be used.

The floor adhesive of the present invention comprises 20 to 70 wt% of a rubber-like polymer having no functional group that reacts with an isocyanate group, and 80 to 30 wt% of a tackifier resin that does not form a network structure by reacting with the isocyanate group. Since the isocyanate compound is blended in an amount of 6 to 30 parts by weight with respect to 100 parts by weight of the composition, the synthetic resin floor material can be easily peeled off without any trouble, and the peeled synthetic resin. While being able to be reused as it is without damaging the flooring material or the floor base, it has the property of being one-component and excellent in workability.
And the viscosity in one liquid is stable for a long time, the initial adhesive strength is strong, it does not peel off against the curl of the sheet-like synthetic resin flooring, and the isocyanate type By blending the compound, the heat resistance and plasticizer resistance are improved, and furthermore, since the adhesive strength after aging is appropriate, the synthetic resin flooring can be easily replaced.

  Hereinafter, embodiments of the floor pressure-sensitive adhesive of the present invention will be described.

  This floor adhesive is an adhesive suitable for adhering a synthetic resin floor material, for example, a vinyl chloride floor material, to a floor base material, and is a rubber-like polymer having no functional group that reacts with an isocyanate group. 100 wt% composition comprising 20 to 70 wt%, more preferably 40 to 60 wt%, and 80 to 30 wt% tackifying resin that does not form a network structure by reacting with isocyanate groups, more preferably 60 to 40 wt% 6 to 30 parts by weight, more preferably 8 to 20 parts by weight of an isocyanate-based compound with respect to parts.

  In this case, examples of the rubber-like polymer include styrene butadiene styrene block copolymer (SBS), styrene butadiene rubber (SBR), styrene isoprene styrene block copolymer (SIS), styrene ethylene butylene styrene block copolymer ( One or more of SEBS), isoprene rubber (IR), butyl rubber (IIR) and the like can be used. Among these, styrene isoprene styrene block copolymer (SIS) is particularly preferable.

  Examples of tackifying resins include petroleum resins, terpene hydrocarbon resins, coumarone indene resins, ketone resins, and rosin esters having an average number of functional groups per molecule of functional groups that react with isocyanate groups of 1.0 or less. 1 type (s) or 2 or more types, such as resin, can be used.

  Furthermore, as the isocyanate compound, hexamethylene diisocyanate, tolylene diisocyanate (TDI), crude TDI, xylylene diisocyanate, naphthalene diisocyanate, paraphenylene diisocyanate, 2-chloro-1,4-phenyl diisocyanate, 4,4′-diphenylmethane Diisocyanate compounds such as diisocyanate (MDI), trimethylhexamethylene diisocyanate, isophorone diisocyanate, uretidinedione type dimerization products of these diisocyanate compounds, also biuret type trimerization products, also isocyanurate type trimerization products, also 1,3-propanediol, Adducts with polyols such as trimethylolpropane, triphenylmethane triisocyanate, tris (isocyanate) Tofeniru) can be used one or more polymeric polyisocyanate compounds such as triisocyanate compounds such as thiophosphate and crude MDI ( "PAPI" Dow Nippon Polyurethane Co., Ltd.).

On the other hand, as the solvent for dissolving the above components, one or more organic solvents such as toluene, MEK, acetone, normal hexane, cyclohexane, methylcyclohexane and the like can be used. The pressure-sensitive adhesive is adjusted to a viscosity of about 1500 to 6000 mPa · s / 20 ° C., which is suitable for use in one liquid.
In this case, in addition to the main raw material, an inorganic filler, an antioxidant, a light stabilizer, a plasticizer, a pigment, and the like can be appropriately blended as necessary.
Moreover, the said adhesive uses the rubber-like polymer, tackifying resin, an isocyanate type compound, and a solvent in the container, and stirs with a stirrer and uses what was melt | dissolved completely.

  In Table 1, the composition and evaluation of the Example of an adhesive for floors of this invention and a comparative example are shown.

Here, the peel strength test conditions are 90 ° peel, the speed is 50 mm / min, and the sample bonding condition is that the adhesive is applied to the slate plate by 180 g / m ² with 5 mm intervals. After a predetermined time, the sample was placed, and a 5 kg load roller was reciprocated twice and pressed. In addition, the 25-mm width PVC flooring made from Takiron Co., Ltd. was used for the sample.

As a criterion for evaluation, the peel strength needs to be 2.5 to 10 N / 25 mm (◯), preferably 4.0 to 9.0 N / 25 mm (◎), and is unsuitable if out of range (× ).
When the viscosity of the adhesive is remarkably changed between 5 days after production and 20 days after production, it is not stable and difficult to use as a one-component type.

  As is clear from Table 1, it was confirmed that the floor pressure-sensitive adhesives of each Example had various properties relating to stability and peel strength required for the floor pressure-sensitive adhesives under various conditions.

On the other hand, when the PAPI135 of the isocyanate compound is too small as in Comparative Example 1, the adhesive is greatly affected by the migration of the plasticizer of the synthetic resin floor material such as vinyl chloride, and the peel strength after 20 days at 50 ° C. Is weak.
When the PAPI135 of the isocyanate compound is too much as in Comparative Example 2, the peel strength after 20 days at 20 ° C. is too strong, and it takes time to replace the synthetic resin flooring.
When PAPI135 of an isocyanate compound is not blended as in Comparative Example 3, the heat-resistant peel strength at the time of peeling at 50 ° C. after bonding at 20 ° C. and leaving for 20 days at 20 ° C. is weak. In addition, the adhesive is greatly affected by the migration of a plasticizer in a synthetic resin floor material such as vinyl chloride, and the peel strength after 20 days at 50 ° C. is also weak.
As in Comparative Example 4, when a rosin ester resin having an average functional group number per molecule of functional groups that react with isocyanate is 1.0 or more, the solution viscosity of the pressure-sensitive adhesive is greatly increased and the stability is poor.
When the ratio of the tackifying resin is too large with respect to the rubbery polymer as in Comparative Example 5, the adhesive is greatly affected by the migration of the plasticizer of the synthetic resin floor material such as vinyl chloride. The peel strength after days is weak.
As in Comparative Example 6, when the ratio of the tackifying resin to the rubbery polymer is too small, the adhesive strength to the synthetic resin flooring material is weak.

Thus, the floor pressure-sensitive adhesive of this example is composed of 20 to 70 wt% of a rubber-like polymer that does not have a functional group that reacts with an isocyanate group, and 80 to 30 wt% of a tackifying resin that does not form a network structure by reacting with the isocyanate group. Since 6 to 30 parts by weight of an isocyanate compound is blended with 100 parts by weight of the composition comprising the above, the synthetic resin flooring can be easily peeled off without requiring any trouble, and peeling. While being able to be reused as it is without damaging the synthetic resin floor material and floor base, it has the property of being excellent in workability with one liquid.
This floor adhesive has a stable viscosity over a long period of time, has a strong initial adhesive strength, and can be peeled off from a sheet-like synthetic resin flooring curl. In addition, heat resistance and plasticizer resistance are improved by blending an isocyanate compound, and since the adhesive strength after aging is appropriate, there is no need for troubles such as when the synthetic resin sheet is replaced. And other properties required for floor adhesives.

  In addition, the resin is composed of 40 to 60 wt% of a rubber-like polymer and 60 to 40 wt% of a tackifying resin, or 8 to 20 parts by weight of an isocyanate compound is blended with 100 parts by weight of the composition. Even better peel strength can be obtained.

  As mentioned above, although the adhesive for floors of the present invention has been described based on the examples thereof, the present invention is not limited to the compositions and the like described in the above-mentioned examples, and the configurations thereof are appropriately made within the scope not departing from the gist thereof. Can be changed.

  The pressure-sensitive adhesive for floors of the present invention has a stable viscosity for a long time, has a strong initial adhesive strength, and can be peeled off from a sheet-like synthetic resin flooring curl. In addition, since it has the characteristics of having excellent heat resistance and plasticizer resistance and suitable adhesive strength after aging, for example, it can be suitably used for the use of removable adhesives for floors. it can.

Claims (4)

  For 100 parts by weight of a composition comprising 20 to 70 wt% of a rubbery polymer having no functional group that reacts with an isocyanate group and 80 to 30 wt% of a tackifying resin that does not form a network structure by reacting with an isocyanate group, A floor adhesive comprising 6 to 30 parts by weight of an isocyanate compound.   The rubbery polymer is composed of one or more of styrene butadiene styrene block copolymer, styrene butadiene rubber, styrene isoprene styrene block copolymer, styrene ethylene butylene styrene block copolymer, isoprene rubber and butyl rubber. The floor adhesive according to claim 1.   One type of rosin ester resin having an average number of functional groups per molecule of a functional group that reacts with a petroleum resin, a terpene hydrocarbon resin, a coumarone indene resin, a ketone resin, and an isocyanate group, It consists of 2 or more types, The adhesive for floors of Claim 1 or 2 characterized by the above-mentioned.   Isocyanate compound is diisocyanate compound, uretidine dione dimerization product of diisocyanate compound, biuret type trimerization product, isocyanurate type trimerization product, adduct body with polyol, triisocyanate compound and polymeric polyisocyanate compound It consists of the above, The floor adhesive of Claim 1, 2, or 3 characterized by the above-mentioned.