JP2605246B2 - Bowling lane repair method and repair materials - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for repairing a bowling lane having excellent transparency, oil resistance, weather resistance (yellowing resistance), abrasion resistance and impact resistance. is there.

(Prior Art and Problems) The bowling lane is usually made of wood, and the surface of the lane is coated with a transparent resin lacquer. However, while the lane is used, the lane is made of wood, so it becomes uneven due to the ball. Therefore, the lane is shaved again to smooth the lane surface (resurface), and a transparent resin lacquer is applied.

This resurface requires many steps,
Since the surface is shaved, the lane becomes thinner and becomes unusable, and the lane itself must be replaced. However, building a new bowling lane is not only expensive,
There is a problem that a long period of time during which the bowling alley cannot be operated is very long because replacement work takes a lot of time.

In recent years, attempts have been made to deal with such a situation by processing a thick resin coating layer on the lane base to eliminate the need for a resurface and facilitate repairs and the like. (Japanese Patent Application Laid-Open No. 58-109563) Although a flexible epoxy resin is used in this, when used in an actual bowling game, the resin coating layer is cracked by an impact such as a ball drop or the like, and a long time in a bowling field is not provided. There was a problem of yellowing due to extended lighting.

Accordingly, the present inventors have studied, as a result of research, a bowling lane in which a polyurethane resin is applied and then a flexible epoxy resin is applied (Japanese Utility Model Application Laid-Open No. 62-160987) and a bowling lane in which a polyurethane resin is applied to 1 mm or more. Showa 6
2-183882). However, they did not satisfy all of transparency, weather resistance, impact resistance, abrasion resistance and oil resistance.

Furthermore, the present inventors conducted research on a bowling lane having a long lane life with excellent transparency, oil resistance, weather resistance (yellowing resistance), impact resistance and abrasion resistance, and after applying an epoxy resin, A bowling lane (Japanese Utility Model Application No. 61-119847) coated with a polyurethane resin was proposed. It satisfies all of transparency, oil resistance, weather resistance (yellowing resistance), impact resistance, and abrasion resistance, but polyurethane resin is easy to foam, depending on the temperature and humidity of the bowling place during construction There was a problem that the lane that had been worked on was difficult to see due to the foaming of the polyurethane resin layer.

For this reason, the present inventors further describe a repair method for stably obtaining a bowling lane having excellent lane life with excellent transparency, oil resistance, weather resistance (yellowing resistance), impact resistance, and abrasion resistance. As a result of research, the present invention has been completed.

(Means for Solving the Problem) That is, the present invention forms an epoxy resin layer having excellent transparency and weather resistance (yellowing resistance) as a base treatment layer on a substrate, and further forms a transparent top layer thereon. When forming a bowling lane with a polyurethane resin layer excellent in heat resistance, oil resistance, weather resistance (yellowing resistance), impact resistance and abrasion resistance, especially when applying polyurethane resin, By removing bubbles generated at the time of two-liquid mixing and the like by a vacuum degassing treatment, a repair method characterized by preventing bubbles from being generated in the polyurethane resin layer and an isocyanate group-containing urethane prepolymer, a polyol and a solvent. And a bowling lane repair material characterized by being a two-component polyurethane resin having a solvent content of 5% by weight or less and a viscosity of 1000 to 3000 centipoise (25 ° C.). It is intended.

(Constitution) The epoxy resin used for the undercoating layer is preferably a hardness (Shore D) at 25 ° C of 50 to 85, especially 65 to 85, a tensile strength of 100 kg / cm ² or more, particularly 100 to 400 kg / cm ² , and an elongation at break. Ten%
Above, especially 30-120%, tear strength 30 kg / cm or more, especially 30-
Having a physical property of 150 kg / cm, a condensation reaction product of bisphenol A or bisphenol F with epichlorohydrin and a curing agent (for example, polyamine and / or a modified product thereof)
Is used. These epoxy resins are
It is preferable to use a flexible epoxy resin which has flexibility by various methods described in the following specific examples and which generally has a breaking elongation of 10% or more as measured by JIS K-6301.

Specific examples of the flexible epoxy resin include a type in which a flexibility imparting component having an epoxy group as shown in the following (i) to (iv) is contained in a main agent system, (i) polyoxyalkylene glycol diglycidyl. Ether type, for example, Epicron 705,707 (product of Dainippon Ink and Chemicals, Inc.),
(Ii) long chain dibasic acid diglycidyl ester type, for example, OS
Resin 101 (product of Okamura Oil Co., Ltd., (iii) bisphenol A alkylene oxide addition type, for example, EP-4000 (product of Asahi Denka Co., Ltd.), (IV) urethane-modified epoxy resin type, for example, Epitan E-195, E- 301 (manufactured by Dainippon Ink and Chemicals, Inc.), a type that provides flexibility with a curing agent, for example, a polyamide type (condensate of dimer acid or aliphatic dibasic acid and polyamine), a long-chain amine (polyetheramine, Aliphatic modified amines), rubber elastic material dispersion type such as HYCAR (Goodrich Co., Ltd. product), linear polymer type such as Kaomat SK (Kao Co., Ltd. product), etc. DO
There are P, DBP, and those obtained with the plasticizer of process oil. Is preferred, but is preferred. These epoxy resins are used by mixing ordinary epoxy resin curing agents such as polyamines.

As the material of the bowling lane on which the epoxy resin is applied, any of various woods used for bowling lanes, such as maple, can be used.

The epoxy resin layer of the present invention is provided as a base treatment layer, and has a first object of sealing a base wood.

For this reason, the epoxy resin is preferably liquid at room temperature, and it is preferable to add a thixotropic agent (for example, fine powder silica) to adjust the viscosity. Further solvent,
An antifoaming agent may be added. The addition amount is preferably 0.01 to 10 parts by weight based on 100 parts by weight of the resin.

It is also preferable that this epoxy resin be defoamed in the same manner as the polyurethane resin described later to remove air bubbles generated during mixing and the like.

If the polyurethane resin is directly coated on the substrate without providing the undercoating layer, the polyurethane resin undergoes a foaming phenomenon due to the influence of a trace amount of moisture contained in the wood, and cannot be used as a bowling lane having irregularities.

The epoxy resin for base treatment is intended to enter the gap between the lane materials and bond the lane materials. Adhesion in this manner strengthens the underlying lane and is effective in preventing cracks from occurring from the underlying due to rattling of the lane materials.

Furthermore, since this epoxy resin layer generally has better adhesion to the substrate than the polyurethane resin layer, it can also serve as a primer layer. Of course, a primer layer may be separately provided as necessary.

The polyurethane resin coated on the epoxy resin layer preferably has a hardness (Shore D) of 50 to 85 at 25 ° C,
In particular 60 to 85, tensile strength 200kg / cm ² or more, particularly 200~500kg / cm
² , Elongation at break 30% or more, especially 100-400%, tear strength 50kg /
cm, especially 50 to 200 kg / cm, two-component polyurethane resin composed of isocyanate component and polyol component with excellent transparency, oil resistance, weather resistance, abrasion resistance and impact resistance. Can be preferably used. Of course, this does not hinder the use of a one-component polyurethane resin.

The isocyanate component referred to in the present invention is preferably in the form of an isocyanate group-containing urethane prepolymer.
This isocyanate group-containing urethane prepolymer is produced by reacting a polyhydroxyl compound with a polyisocyanate compound. Examples of the polyhydroxyl compound include various polyester polyols and / or polyether polyols used for producing general urethane compounds. As used herein, the polyester polyol includes a condensate of a polyhydric alcohol and a polybasic carboxylic acid, a condensate of a hydroxycarboxylic acid and a polyhydric alcohol, and the like. Examples of the polyhydric alcohol used therein include ethylene glycol and propylene. Glycol, butanediol, diethylene glycol, glycerin, hexanetriol, trimethylolpropane, and the like.Examples of polybasic carboxylic acids include adipic acid, glutaric acid, azelaic acid, fumaric acid, maleic acid, phthalic acid, terephthalic acid, and dimer. Acid, pyromellitic acid and the like. Also useful as a condensate of hydroxycarboxylic acid and polyhydric alcohol are castor oil, and reaction products of castor oil with ethylene glycol, propylene glycol and the like. Further, as the polyester polyol, lactone-based polyester polyols obtained by ring-opening polymerization of lactones such as ε-caprolactone can also be used. As the lactone-based polyester polyols, ε-
Caprolactone, δ-valerolactone, β-methyl-δ
-Any one obtained by addition polymerization of one or more of valerolactone and the like can be used. The polyether polyol is, for example, a product obtained by addition polymerization of one or more alkylene oxides such as ethylene oxide, propylene oxide, butylene oxide, and tetrahydrofuran to a compound having two or more active hydrogens. Any of the known polyether polyols used for producing resins can be used.
In this case, as the compound having two or more active hydrogens,
For example, in addition to the above-mentioned polyhydric alcohols and polybasic carboxylic acids, amines such as ethylenediamine and hexamethylenediamine, alkanolamines such as ethanolamine and propanolamine, polyhydric phenols such as resorcinol and bisphenol, castor oil And the like.

As the polyhydroxyl compound, one or more of a polyester polyol and a polyether polyol may be used, and a low molecular weight polyhydroxy compound such as the above-mentioned polyhydric alcohol may be used in combination.

The polyisocyanate compound used in the production of the isocyanate group-containing urethane prepolymer is a compound having two or more isocyanate groups in the molecule, and various compounds used in the production of ordinary polyurethane resins can be used. Isocyanate, diphenylmethane diisocyanate, dianidin diisocyanate,
Aromatic polyisocyanate compounds such as naphthalene diisocyanate, triphenylmethane triisocyanate, bis (diisocyanatotolyl) phenylmethane, and polymethylene polyphenyl polyisocyanate can also be used, but more preferably aliphatic or alicyclic compounds are used. It is preferable to use a polyisocyanate compound from the viewpoint of preventing yellowing. Examples of the aliphatic or alicyclic polyisocyanate compound include isophorone diisocyanate, dicyclohexylmethane diisocyanate (hydrogenated diphenylmethane diisocyanate), hexamethylene diisocyanate, xylylene diisocyanate, hydrogenated tolylene diisocyanate, and isopropylidene bis (cyclohexyl isocyanate). It is.

The polyisocyanate compound used in the present invention comprises 2
You may use a combination of two or more kinds of polyisocyanate compounds,
Particularly, an aromatic or alicyclic polyisocyanate compound may be used in combination with an aromatic polyisocyanate compound to such an extent that yellowing resistance is not impaired.

The isocyanate group-containing urethane prepolymer used in the present invention is obtained by reacting a polyhydroxyl compound and a polyisocyanate compound, but the reaction molar ratio of the polyhydroxyl compound and the polyisocyanate compound may be any as long as the isocyanate excess. The mixing ratio, reactivity and the like may be set in consideration of the conditions, but preferably 1 / 1.1 or more. When the ratio is closer to 1/1 than 1 / 1.1, the viscosity of the resin becomes too high, and the workability is deteriorated. Conversely, when there is a large excess of isocyanate, there is no particular upper limit on the molar ratio. In some cases, the above-mentioned polyisocyanate compound may be used as isocyanate component without urethane prepolymerization.

As the polyol component of the polyurethane resin, all of the above-mentioned polyhydroxyl compounds used for producing an isocyanate group-containing urethane prepolymer can be used. That is, one or more of the above-mentioned polyester polyols and polyether polyols can be used.
Further, a low molecular weight polyhydroxy compound such as the above-mentioned polyhydric alcohol can be used in combination as a polyol component.
Further, a curing catalyst (for example, a metal catalyst such as dibutyltin laurate and lead octylate) and a solvent (for example, xylene, toluene,
Ethyl acetate), an antifoaming agent (for example, a silicon-based antifoaming agent),
Various stabilizers (e.g., ultraviolet absorbers, antioxidants) can be preferably added at 0.01 to 5% by weight. The solvent is preferably 3% by weight or less, because the solvent becomes thin after curing.

The polyurethane resin layer of the present invention is provided as a top layer and is usually coated to a thickness of 1 mm or more, preferably 2 to 10 mm.

This coating thickness does not have to be uniform over the entire lane, and the coating thickness may be changed depending on the location, for example, by increasing the location where the ball falls sharply.

Further, the coating may be performed by limiting only a portion to be coated, such as a pin deck portion.

When coating the resin layer, dirt or the like obtained by cutting and polishing the surface of the lane is removed as a pretreatment. The thickness of the coating layer is equal to the level lower than the reference plane of the approach portion (where the ball is thrown) due to cutting or the like.

Next, a base treatment epoxy resin is uniformly applied using a rubber applicator or the like. Before or after this operation, a masking tape or the like is stuck on the outer periphery of the application portion so that the upper end edge thereof has a thickness equal to or more than the planned thickness.

After this epoxy resin layer is cured, a polyurethane resin is poured in.
~ 3000 centipoise, it is difficult to pour outside this range. Before pouring (in the case of a two-liquid type, while mixing or after mixing the two liquids), air bubbles existing in the resin are defoamed using a vacuum pump or the like. Needless to say, defoaming treatment may be performed at the time of resin production, but defoaming treatment at the time of construction at the site is preferable because foaming is less generated. Examples of the apparatus used for the defoaming under reduced pressure include, for example, a mixer equipped with a vacuum pump on a rotary agitator such as Mixter manufactured by Mixter Industries and a hard mixer manufactured by Nippon Sosei Kogyo.

By defoaming the polyurethane resin, it is possible to completely prevent the polyurethane resin layer from foaming during curing, and the finish upon curing becomes very beautiful. As described above, it is preferable that the defoaming treatment is also applied to the epoxy resin for base treatment. While pouring the defoamed polyurethane resin,
Smooth with an applicator.

After the polyurethane resin is cured, the masking tape or the like is removed, and the entire surface is sanded to finish the outer peripheral edge by chamfering.

Since polyurethane resin is particularly excellent in wear resistance and impact resistance, it can sufficiently cope with conditions such as bowling ball falling.

Further, the resin coating layer of the present invention is an epoxy resin layer,
Since both the polyurethane resin layers are excellent in transparency and weather resistance (yellowing resistance), marks and the like of a bowling lane as a base can be clearly identified.

Further, wax is applied on the polyurethane resin coating layer to improve the rotation of the bowling ball. The polyurethane resin layer exhibits strong resistance to the wax and can be used for a long time.

The bowling lane of the present invention is constituted by providing an epoxy resin coating layer and a polyurethane resin coating layer on a substrate.

The drawing is a longitudinal sectional view of one embodiment of a bowling lane coated with a resin according to the present invention. The resin-coated bowling lane will be described with reference to the drawings. The resin-coated bowling lane is formed by coating an epoxy resin coating layer 2 on a substrate 1 and a polyurethane resin coating layer 3 thereon. At this time, a primer layer 4 may be provided between the base and the resin coating layer.

The resin-coated bowling lane of the present invention can be manufactured by manufacturing a cured resin into a plate-like body having a predetermined size and bonding it to a base, but is usually directly constructed on site. And generally, an epoxy resin coating layer is preferably used.
0.1 to 0.3 mm, the polyurethane resin coating layer is preferably finished to 2 to 10 mm. When a primer is used, this primer layer is preferably finished to a thickness of 0.05 to 0.2 mm.

Further, an existing transparent resin lacquer for lane may be applied on the resin coating layer for finishing. In this case, this lacquer layer is finished to about 0.1 mm. As the lacquer, an acrylic resin, an acrylic polyurethane resin, a polyurethane resin, or the like is preferably used.

(Effect) Particularly remarkable effects are seen in the transparency, weather resistance (yellowing resistance) and impact resistance of the coating layer. Because of its excellent transparency, there is no problem in identifying the marks on the substrate even if a thick coating is applied.

In addition, since it has excellent weather resistance (yellowing resistance), it does not yellow even when exposed to the lighting of a bowling alley for a long time, and maintains excellent transparency at the beginning of construction.

Further, since it has excellent impact resistance, even if the ball is mistakenly thrown onto a lane during an actual bowling game, for example, there is no occurrence of cracking of the coating layer or peeling off from the base. Moreover, when the hardness of the polyurethane resin coating layer changes little with respect to the change in environmental temperature, the hardness does not become extremely high (hardens) even when the lane is cooled in winter, and the characteristics such as impact resistance remain unchanged. Will be retained. Conversely, even if the lane becomes hot in the summer, the hardness does not extremely decrease (become soft), so that high physical properties are maintained. Further, since the change in hardness is small with respect to the change in the environmental temperature, the rolling characteristic of the ball, the sound when the ball falls, and the like do not change in winter and summer, and stable characteristics are exhibited in this aspect. This effect cannot be expected with only the epoxy resin coating layer or a coating layer made of another material such as polycarbonate. An excellent bowling lane can be obtained only by coating the polyurethane resin layer on the epoxy resin layer as in the present invention.

Example 1 For a bowling lane which has been used for about 15 years and it is difficult to continue a normal resurfacing, first, a flexible epoxy resin epitan using polyoxyalkylene glycol diglycidyl ether as a flexibility-imparting component was used. E-
307U (made by Dainippon Ink and Chemicals, Inc.) as lactamide
After being mixed with the WH-036S curing agent, the defoamed product was applied to a thickness of about 0.2 mm using a rubber applicator as a base treatment.

After standing at room temperature overnight, after the epoxy resin of the base treatment layer was cured, a masking tape was applied around the periphery of the lane to prevent the polyurethane resin from being poured.

Next, a two-part polyurethane resin comprising an isocyanate group-containing urethane prepolymer, Epitan E-310 (manufactured by Dainippon Ink and Chemicals) and a polyol component, epitan C-75 (manufactured by Dainippon Ink and Chemicals) is mixed in two parts, After defoaming at the site, it was poured into a lane and applied so as to have an average thickness of about 5 mm. At this time, the thickness of the pin deck and the vicinity of the approach where impact resistance is required is particularly thick (about 7 to 10 m).
m), the center of the lane was applied so as to be about 2-3 mm.

After the polyurethane resin layer was cured at room temperature overnight, the masking tape was removed and the entire lane surface was sanded.

As a finish, urethane-based paint, U-300
About 0.05 mm of a score coat (manufactured by Veri Austin) was applied.

The obtained cured epoxy resin for base treatment had a hardness of 68 (Shore D) at 25 ° C., a tensile strength of 255 kg / cm ² , an elongation of 95%, and a tear strength of 85 kg / cm.

The top polyurethane resin has a hardness of 72 (Shore D) at 25 ° C, a tensile strength of 385 kg / mm ² , an elongation of 170%, and a tear strength of 12
It was 0 kg / cm.

This lane was used for actual bowling games for one year (approximately 20,000 digestive games), but maintained excellent transparency at the beginning of construction without yellowing. In addition, the coating layer did not crack or peeled off from the substrate.

Example 2 A resin coating was applied only to the pin deck portion which was most severely damaged on a bowling lane which had been used for about 10 years.

First, a one-component polyurethane-based primer, Pandex T-200 (manufactured by Dainippon Ink and Chemicals) was applied to a thickness of about 0.05 mm, and then, as in Example 1, Epitan E-307U was used for a base treatment to a thickness of about 0.15 mm. Coated.

Further, after the epoxy layer was cured, a necessary portion was masked, and Epitan E-310 / Epitan C-75 having a thickness of about 8 mm was poured in the same manner as in Example 1. After curing, the masking tape was removed, and the interface with the masking tape was chamfered to finish.

This lane has also passed about one year (approximately 20,000 digestive games), but retains excellent transparency at the beginning of construction without yellowing. Also, there is no cracking of the coating layer and no peeling from the substrate.

Comparative Example 1 A lane in the same state as the lane used in Example 1 was poured into a lane in which a flexible epoxy resin using a polyoxyalkylene glycol diglycidyl ether type was used. It was applied to an average thickness of about 5 mm. At this time, the coating was applied so that the pin deck portion and the vicinity of the approach were thick (about 7 to 10 mm), and the center of the lane was about 2 to 3 mm.

After the epoxy resin was cured at room temperature overnight, the masking tape was removed and the entire lane surface was sanded.

As a finish, urethane-based paint, U-300
About 0.05 mm of a score coat was applied.

The obtained epoxy resin cured product has a hardness of 72 (Shore D) at 25 ° C., a tensile strength of 260 kg / cm ² , an elongation of 85%, and a tear strength of 90 kg / cm.
Met.

When used for actual bowling games, several cracks occurred near the foul line within one week (within 400 digestive games). After continuing to use it as it was, cracks reached more than 30 places in 3 months (about 5,000 games consumed), mainly near the foul line and pin deck. In addition, it was difficult to identify marks on the base due to yellowing, and it was not possible to continue using the marks.

Comparative Example 2 Only the polyurethane resin of Example 1 was applied on a substrate in the same manner as in Example 1 except that the defoaming operation was not performed.

In the obtained lane, since many bubbles were generated, the white lane was poor in transparency and the base mark could not be identified. In addition, impact resistance was poor due to bubbles.

Comparative Example 3 The defoamed polyurethane resin of Example 1 was applied to a base lane in a thickness of 2 mm, and the epoxy resin of Comparative Example 1 was applied thereon in a thickness of 3 mm.

When used in a game, cracks occurred on the lane surface three months later, and the impact resistance was poor. Further, the yellowing resistance was poor and it was difficult to identify marks. Furthermore, in the polyurethane resin layer, some bubbles were generated, which caused cracks and deteriorated transparency.

[Brief description of the drawings]

1 and 2 are longitudinal sectional views of one embodiment of a bowling lane in which a polyurethane resin layer formed by the repair method according to the present invention is formed on an epoxy resin layer. In this drawing, reference numeral 1 denotes a base, 2 denotes an epoxy resin coating layer,
Reference numeral 3 denotes a polyurethane resin coating layer, 4 denotes a primer layer, 5 denotes a lacquer layer, 6 denotes an approach portion, and 7 denotes a pin deck portion.

Claims (5)

(57) [Claims] 1. A method for repairing a bowling lane, comprising applying an epoxy resin layer onto a base of a bowling lane, and then applying a polyurethane resin obtained by subjecting air bubbles to defoaming under reduced pressure. 2. The bowling lane repair method according to claim 1, wherein the epoxy resin has a thixotropic agent added thereto. 3. The method according to claim 1, wherein the thickness of the epoxy resin layer is 0.1 to 0.3 mm and the thickness of the polyurethane resin layer is 2 to 10 mm. 4. A bowling lane repaired by the repair method according to claim 1. 5. Bowling comprising a urethane prepolymer containing isocyanate groups, a polyol and a solvent, wherein the solvent is 5% by weight or less and the viscosity is 1000 to 3000 centipoise (25 ° C.). Repair material for lane.