JPH01201281A - Mending method and mending material for bowling lane - Google Patents

Abstract

PURPOSE:To stably obtain a bowling lane having a long lane life and excellent for transparency, oil resistance, antiweatherability (yellowing resistance), impact resistance and wear resistance by coating an epoxy resin layer on the base of the bowling lane, and then, coating a polyurethane rein performed with a vacuum degassing processing. CONSTITUTION:An epoxy resing coated layer 2 is coated on a substrate 1 and a polyurethane resing coated layer 3 is coated over it. After the curing of the epoxy resing layer, polyurethane resins are applied, while, the polyurethane resins should be at a viscosity 1,000-3,000 centipoise, and those outside the above-mentioned range are difficult to be applied. Before the apply (when they are of two part type, during mixture or after the mixture), bubbles existing in the resins are defoaming-processed with the use of a vacuum pump, etc. A primer layer may be provided between the base and the resin coated layer. It is preferable that the epoxy resin coated layer is finished at a width 0.1-0.3mm, and the polyurethane resin coated layer is finished at the width 2-10mm. When the primer is used, the primer layer should be finished at the width 0.05-0.2mm.

Description

[Detailed description of the invention] (Industrial application field) It is related to

(Prior Art and Problems) Bowling lanes are usually made of wood, and the surface of the lane is coated with a transparent resin lacquer. However, as the lanes are made of wood, they become uneven as they are used, so the wood is shaved again to make the lane surface smooth (Resurfacing), and then a transparent resin lacquer is applied.

This resurfacing requires many measures, and since the surface is scraped, the lane gradually becomes thinner and becomes unusable, necessitating the replacement of the lane itself. However, not only is the construction of a new bowling lane expensive, but also the replacement work requires a great deal of time, so there is a problem that the bowling alley will be out of business for a very long time.

In response to this situation, attempts have recently been made to process a thick resin coating layer on the lane base to eliminate the need for resurfacing and facilitate repairs. (Japanese Unexamined Patent Publication No. 58-109563 @) Flexible epoxy resin is used for this, but when it is actually used for urling games, the sol may fall off! #The resin coating layer cracked on your palm? There was a problem with yellowing caused by long-term lighting in the wrestling hall.

As a result of research, the present inventors have developed a bowling lane in which a polyurethane resin is applied and then a flexible epoxy resin (Japanese Utility Model Publication No. 160987/1987), and a bowling lane in which one or more pigeons are coated with a polyurethane resin. (
(Japanese Utility Model Application Publication No. 183882/1982) was proposed. However, these did not satisfy all of transparency, weather resistance, impact resistance, abrasion resistance, and oil resistance.

Furthermore, as a result of research on bowling lanes with long lane lifespans that have excellent transparency, oil resistance, weather resistance (yellowing resistance), impact resistance, and abrasion resistance, the present inventors applied epoxy resin. We proposed a bowling lane coated with polyurethane resin (Utility Application No. 119847/1983). This material satisfies all of transparency, oil resistance, weather resistance (yellowing resistance), impact resistance, and abrasion resistance, but polyurethane resin tends to foam, and the temperature and humidity of the bowling alley during construction In some cases, the lanes that were constructed became unsightly due to the foaming of the IJ urethane resin layer.

For this reason, the present inventors further improved transparency, oil resistance, weather resistance (
The present invention was completed as a result of research into a repair method for stably obtaining bowling lanes with long lane lifespans that have excellent yellowing resistance, impact resistance, and abrasion resistance.

(Means for Solving the Problem) That is, the present invention forms an epoxy resin layer with excellent transparency and weather resistance (yellowing resistance) as a base treatment layer on a substrate, and then forms a transparent top layer on top of the epoxy resin layer. When forming a bowling lane made of a polyurethane resin layer with excellent properties such as durability, oil resistance, weather resistance (yellowing resistance), impact resistance, and abrasion resistance, especially when applying polyurethane resin, during resin manufacturing and A repair method characterized by preventing air bubbles from forming in the polyurethane resin layer by removing air bubbles generated when two liquids are mixed, etc. by a vacuum degassing treatment, and an incyanate group-containing urethane grebolimer and polyol. and a solvent, the solvent is less than 5% by weight, and the viscosity is 1000 to 300.
The present invention provides a bowling lane repair material characterized by being a two-component polyurethane resin of 0 centimeter size (25° C.).

(Structure) The epoxy resin used for the base treatment layer preferably has a hardness (Shore D) of 50 to 85 at 25°C, particularly 65 to 8.
5. Tensile strength 100kg7cm or more, especially 100~
400 kg/2, breaking elongation 10 inches or more, especially 30~
120%, tear strength 30 kll/cm or more, especially 30
A combination of a condensation reaction product of bisphenol A or bisphenol F and epichlorohydrin and a curing agent (for example, a polyamine and/or a modified product thereof) is used. These epoxy resins are made flexible using various methods described in the following specific examples, and generally the elongation at break of the cured product is JIS K-6.
Preferred are flexible epoxy resins that are 10% or more as measured by 301.

Specific examples of flexible epoxy resins include ■ or less (+)
~ (Types containing a flexibility-imparting component having a niboxy group in the main system as shown in ♀, (+) polyoxyalkylene glycol diglycidyl ether type, e.g. Epiclon 7
05,707 (Dainippon Ink & Chemicals Co., Ltd. product),
(ji) Long-chain dibasic acid diglycidyl ester type, e.g. OS Resin 101 (product of Intermedia Oil Co., Ltd., OiD bisphenol A alkylene oxide addition type, e.g. EP
-40oo (Asahi Denka (dog products), (1 φ urethane modified niboxy resin type, e.g. Ebitan E-195, E-3
01 (product of Dainippon Ink and Chemicals Co., Ltd.), ■ Types that provide flexibility with a hardening agent, such as polyamide type (condensation product of dimer acid or aliphatic dibasic acid and polyamine), long chain amine (polyether amine) , aliphatic modified amines, etc.)
, ■ Fractional type of rubber elastic material such as HYCAR (product of Gutdrich Co., Ltd.), ■ Linear polymer type such as Kaohmat SK (product of Kako Co., Ltd.), ■ Tie that provides flexibility with a plasticizer 7° such as DOP, There is DBP, which is obtained by using the plasticizer of Procell oil.

Examples include ■ to ■, but ■ is preferred. These epoxy resins are used in combination with a curing agent for ordinary epoxy resins such as polyamine.

Of the base to apply epoxy resin? As for the material of the bowling lane, any of the various woods used for bowling lanes, including maple and rudder, can be used.

The epoxy resin layer of the present invention is provided as a base treatment layer, and its primary purpose is to seal the wood base.

For this reason, the epoxy resin is preferably liquid at room temperature, and it is preferable to add a thixotropic agent (for example, finely powdered silica) to adjust the viscosity. Furthermore, a solvent, an antifoaming agent, etc. may be added.

The amount added is preferably 0.00 parts by weight per 100 parts by weight of the resin.
01 to 10 parts by weight.

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.

If polyurethane resin is directly coated on the base without providing this base treatment layer, the polyurethane resin will foam due to the influence of trace amounts of moisture contained in the wood, resulting in unevenness and will become unusable as a finishing lane.

This epoxy resin for base treatment is intended to penetrate into the gaps between lane materials and bond them together. By adhering in this manner, the underlying lane is strengthened and is effective in preventing cracks from occurring from the underlying material due to looseness of the lane material.

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, one layer of 7' limer may be provided separately if necessary. The polyurethane resin coated on the b0 epoxy resin layer preferably has a hardness (Shore D) of 50 to 85, particularly 60 to 85, and a tensile strength of 200 at 25°C.
kg/'-x 2 or more, especially 200-500 kg7c
m2, elongation at break 30% or more, sometimes 100-400%, tear strength 50 kfl/crs or more, especially 50-200K
It has the physical properties of VcrR and is excellent in transparency, oil resistance, weather resistance, abrasion resistance, and impact resistance, and a two-component polyurethane resin consisting of an incyanate component and a polyol component can be preferably used. Of course, this does not preclude the use of component-type polyurethane resins.

In the present invention, the 85 incyanate component is preferably in the form of an isocyanate group-containing urethane polymer. This isocyanate group-containing urethane polymer is formed by the reaction of a polyhydroxyl compound and a polyisocyanate compound.

Examples of the polyhydroxyl compound include various polyester polyols and/or I-reather deliols used in the production of general urethane compounds.

The polyester polyol referred to herein includes condensates of polyhydric alcohols and polybasic carboxylic acids, condensates of hydroxycarmenic acid and polyhydric alcohols, etc. Polyhydric alcohols used in these include ethylene glycol, propylene glycol, etc. , butanediol, diethylene glycol, glycerin, hexanetriol, trimethylol pro-gun, etc. Examples of polybasic carboxylic acids include adipic acid, geltaric acid, azelaic acid, fumaric acid, maleic acid, phthalic acid, and terephthalic acid. , dimer acid, pyromellitic acid, etc. Also useful as condensates of hydroxycarmenic acid and polyhydric alcohols are castor oil, and reaction products of castor oil and ethylene glycol and propylene glycol. Furthermore, as the polyester polyol, lactone-based polyester polyols obtained by ring-opening polymerization of lactones such as ε-caprolactone can also be used. These lactone-based polyester podiols include those obtained by addition polymerizing one or more of ξ-caglolactone, δ-valerolactone, β-methyl-δ-valerolactone, etc. to the polyhydric alcohols mentioned above. Either can be used. The polyether polyol is a product obtained by addition-polymerizing one or more alkylene oxides such as ethylene oxide, propylene oxide, butylene oxide, and tetrahydrofuran to a compound having two or more active hydrogens, and is a product obtained by addition-polymerizing 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 known polyether polyol used in the production of resins can be used. In this case, examples of compounds having two or more active hydrogens include, in addition to the above-mentioned polyhydric alcohols and polybasic carboxylic acids, ethylenediamine,
Examples include amines such as hexamethylene diamine, alkanolamines such as ethanolamine and pronopronolamine, polyhydric phenols such as resorcinol and bisphenol, and mustard oil.

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

Incyanate group-containing urethane prepoly? The polyisocyanate compound used in the production of - 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, such as tolylene diisocyanate and diphenylmethane diisocyanate. , cyanidine diisocyanate,
Aromatic polyisocyanate compounds such as naphthalene diisocyanate, triphenylmethane triisocyanate, bis(diisocyanatotolyl)phenylmethane, and polymethylene polyphenyl polyisocyanate can also be used, but aliphatic or alicyclic polyisocyanate compounds are more preferably used. It is preferable to use a polyisocyanate compound from the viewpoint of preventing yellowing. Examples of aliphatic or alicyclic polyisocyanate compounds include inphorone diisocyanate, dicyclohexylmethanoisocyanate (hydrogenated diphenylmethane diisocyanate), hexamethylene diisocyanate, xylylene diisocyanate, hydrogenated tolylene diisocyanate, isopropylidene bis(cyclohexyl isocyanate) ) etc.

The polyisocyanate compound used in the present invention may be a combination of two or more polyisocyanate compounds. An aromatic polyisocyanate compound may be used in combination with the aliphatic or alicyclic polyisocyanate compound to the extent that yellowing resistance is not impaired.

The incyanate 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 polyisocyanate compound can be determined arbitrarily as long as the isocyanate is in excess. It may be set based on conditions such as compounding ratio and reactivity, but it is preferably 1/1.1 or more.

If the ratio is closer to 1/1 than 1/1.1, the viscosity of the resin will be high and the rinsing workability will be poor. On the other hand, if there is a large excess of incyanate, there is no particular upper limit to the molar ratio, and in some cases, the polyisocyanate compound mentioned above as the incyanate component is not converted into a urethane prepolymer and its 'd! Well, you can use it.

As the polyol component of the polyurethane resin, all of the above-mentioned polyhydroxyl compounds used in the production of incyanate group-containing urethane prepolymers can be used. That is, one or more of the polyester polyols and polyether polyols described above can be used. Furthermore, a low molecular weight polyhydroxy compound such as the above-mentioned polyhydric alcohol can also be used in combination as a polyol component. Furthermore, the incyanate component or the polyol component may contain a curing catalyst (for example, a metal catalyst such as dibutyltin laurylate or lead octylate), a solvent (for example, xylene, toluene, or ethyl acetate), or an antifoaming agent (for example, a silicone antifoaming agent). agent) and various stabilizers (for example, ultraviolet absorbers, antioxidants) can be added preferably in an amount of 0.01 to 5 times and 11%. Since the solvent causes thinning after curing, it is preferable that the solvent be 3 times thicker or less.

The polyurethane resin layer of the present invention is provided as a top layer and usually has a thickness of 111111 or more, preferably 2 to
10 pieces are coated.

The thickness of this coating does not have to be uniform over the entire lane, and may be varied depending on the location, such as increasing the thickness in areas where the goal falls frequently.

Furthermore, coating may be performed by limiting the portions that are particularly desired to be coated, such as the binder portion.

When coating the resin layer, the surface of the lane is cut and polished to remove dirt and the like as a pretreatment.

The thickness of the coating layer is the amount by which the level of the approach part (where the ball is thrown) is lowered from the reference plane due to cutting, etc.

Next, apply epoxy resin for base treatment evenly using a rubber applicator or the like. Before and after this operation, apply a masking chip etc. to the outer periphery of the application area so that the upper edge is equal to or greater than the intended coating thickness.

After this epoxy resin layer has hardened, polyurethane resin is poured in, and this polyurethane resin has a viscosity of 100%.
It has a centipoise of 0 to 3000 centipoise, and if it is outside this range, it will be difficult to pour. Before pouring (2o.

(For type, mix the two liquids while or after mixing)
Then, use a vacuum pump or the like to remove air bubbles from the resin. Of course, the resin may be defoamed at the time of manufacturing, but it is preferable to have it defoamed at the time of construction because it generates fewer bubbles. An example of a product used for this vacuum degassing is Mixter manufactured by Mixter Industries.

Examples include hard mixers made by Nippon Sosei Gyogyo, which are equipped with a vacuum pump attached to a container-rotating mixer.

By defoaming the polyurethane resin, it is possible to completely prevent the polyurethane resin from foaming during curing, and the finish when cured is also very beautiful. As mentioned above, it is preferable that the degassing treatment is also applied to the epoxy resin for base treatment. While pouring the defoamed polyurethane resin,
Smooth it out with an applicator, etc.

After the polyurethane resin has hardened, masking chips etc. are removed, the entire surface is sanded, and the outer periphery is chamfered to finish.

Polyurethane resin has particularly excellent abrasion resistance and impact resistance, so... It can fully cope with conditions such as the lining falling down.

Further, the resin coating layer of the present invention has excellent transparency and weather resistance (yellowing resistance) K for both the epoxy resin layer and the polyurethane resin layer, so that marks such as bowling lane marks serving as the base can be clearly identified.

Further, on the polyurethane resin coating layer, a C wax (C wax) is applied to improve the rotation of the gelling ball, but the polyurethane resin layer exhibits strong resistance to this wax and can be used for a long period of time.

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

The drawing is a gI cross-sectional view of one embodiment of the resin-coated bowling lane according to the present invention. Referring to the drawings, a resin-coated bowling lane is constructed by coating a base 1 with an epoxy resin coating layer 2 and a polyurethane resin coating layer 3 thereon. When providing the layer, Zolaima No. 4 may be provided between the base and the resin coating layer.

The resin-coated 7'hyN lining lane of the present invention can be produced by manufacturing a cured resin into a plate of a certain size and bonding it to a base, but it is usually constructed directly on-site. In general, the epoxy resin coating layer is preferably finished in a length of 0.1 to 0.3 m, and the polyurethane resin coating layer is preferably finished in a length of 2 to 10 m. In addition, when using a primer, this primer layer has a thickness of 0.05 to 0.
．． Preferably, it is finished to 2 rm.

Furthermore, an existing transparent resin lacquer for lanes may be applied on the resin coating layer for finishing. In this case, this lacquer layer is finished to a thickness of 0.1 m. As this lacquer, acrylic resin, acrylic polyurethane resin, polyurethane resin, etc. are preferably used.

(Effects) Particularly notable effects are the transparency of the coating layer, weather resistance (
seen in yellowing resistance) and impact resistance. Because it has excellent transparency, there is no problem in identifying marks on the base even if a thick coating is applied.

In addition, because it has excellent weather resistance (yellowing resistance), it does not yellow even if exposed to bowling alley lights for a long time, and maintains the excellent transparency it had at the time of construction.

Furthermore, it has excellent impact resistance, so even if you accidentally throw a pole onto the lane during an actual Geuring Derm, the coating layer will not crack or separate from the base. Moreover, since the polyurethane resin coating layer has little change in hardness due to changes in environmental temperature,
Even when the lanes are cold in the winter, the hardness does not become extremely high (hard and stiff) and properties such as impact resistance are maintained.

On the other hand, even if the lane gets hot in the summer, the hardness will drop dramatically (
Because it does not become soft (softening), high physical properties are maintained. or,
Because there is little change in hardness due to changes in environmental temperature? - How is it rolling? -The sound produced when the metal falls does not change in winter or summer, and stable characteristics are exhibited in this aspect as well. This effect cannot be expected with only an epoxy resin coating layer or a coating layer made of other materials such as polycarbonate. An excellent bowling lane can only be obtained by coating an epoxy resin layer with a polyurethane resin layer as in the present invention.

Example 1 For a bowling lane that has been used for about 15 years and has become difficult to continue with a regular glue surface, we first applied a flexible epoxy resin, Epithan E, using polyoxyalkylene glycol diglycidyl ether as a flexibility imparting component. −
307U (manufactured by Dainippon Ink & Chemicals, Inc.) was mixed with Laccamite WH-0363 curing agent, defoamed, and applied to a thickness of about 0.2 van using a rubber applicator as a base treatment.

After the epoxy resin of the base treatment layer had hardened by leaving it at room temperature overnight, masking tape was pasted on the outer periphery of the lane and turned so that when the polyurethane resin was poured in, it leaked in the shape of b.

Next, a two-component polyurethane resin consisting of an incyanate group-containing urethane polymer, Kogitan E-310 (manufactured by Dainippon Ink and Chemicals) and a polyol component, Epithane C-75 (manufactured by Dainippon Ink and Chemicals), was applied as a two-part polyurethane resin. After mixing and degassing on site, it is poured into a lane with an average thickness of approximately 511 mm.
I applied it to make it look like 11.

At this time, the paint was applied thickly (approximately 7 to 10 m) in the binder deck and approach areas where impact resistance is particularly required, and approximately 2 to 3 m in the center of the lane.

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

As a finishing touch, apply urethane paint, U-300.
Approximately 0.05 m of Score Coat (manufactured by Periostin) was applied.

The obtained cured epoxy resin for base treatment has a hardness of 68 (C, A D) and a tensile strength of 255 kl/cns at 25°C.
It has an elongation of 95 cm and a tear strength of 85 cm.

In addition, the polyurethane resin for the top has a hardness of 72 (
Shore D), tensile strength of 385 degrees, elongation of 170 inches, and tear strength of 120 kfl/cm.

This lane was used for actual games for one year (approximately 20,000 games played), and it maintained its excellent transparency without yellowing.

Furthermore, the coating layer did not crack or peel from the base.

Example 2 For a bowling lane that had been used for about 10 years, resin coating was applied only to the most severely damaged bin decks.

First, a one-component polyurethane glimmer, Mater Index T-200 (manufactured by Dainippon Ink Chemical), was applied to a thickness of about 0.05cm, and then, as in Example 1, Epithane E-307U was applied to a thickness for base treatment. It was applied to a distance of approximately 0.15 m.

Furthermore, after the epoxy layer had hardened, the necessary parts were masked, and in the same manner as in Example 1, Epithane E-310/Epitane C-75 was poured to a thickness of approximately 81 cm. After curing, the masking tape was removed and the interface with the masking tape was chamfered to give a finishing touch.

Approximately 1 year has passed for this lane as well (the number of digested rams is approximately 20,000 rms).
-) maintains the excellent transparency it had at the time of construction without yellowing. Also, the coating layer does not crack or peel off from the base.

Comparative Example 1 For a lane in the same condition as the lane used in Example 1,
A flexible epoxy resin based on polyoxyalkylene glycol diglycidyl ether was poured into the masked lanes.

It was applied to about 5 areas with an average thickness. At this time, the coating was applied thickly (approximately 7 to 10 m) near the bin deck and approach areas, and approximately 2 to 3 thick in the center of the lane.

After the epoxy resin had hardened by leaving it at room temperature overnight, the masking tape was removed and the entire lane surface was sanded.

As a finishing touch, apply urethane paint, U-300.
Approximately 0.05 m+ of score coat was applied.

The obtained epoxy resin cured product had a hardness of 72 (Shore D) at 25°C, a tensile strength of 260 kg/crR2, and an elongation of 85 t4.
, the tear strength was 90'y47cm.

When the actual product was used for a Uring game, cracks occurred in several places near the K foul line within a week (within 400 games). After 3 months of continued use (approximately 5,000 derms), cracks appeared mainly around the foul line and the binding area.
Reached 0 or more locations.

There was also yellowing and it was difficult to identify the marks on the board, making it impossible to continue using it.

Comparative Example 2 In Example 1, j? The IJ urethane resin alone was coated on the substrate in the same manner as in Example 1 to a thickness of 5+m without defoaming.

The obtained V-n was white with poor transparency due to the generation of a large number of bubbles, and the marks on the base could not be identified. Also, the impact resistance was poor due to the bubbles.

Comparative Example 3 The degassed polyurethane resin of Example 1 was applied to the lanes of the substrate to a thickness of 2 cm, and the epoxy resin of Comparative Example 1 was further applied thereon to a thickness of 3 cm.

When used for games, cracks appeared on the surface of the lane after 3 months, and the impact resistance was poor.

In addition, the yellowing resistance was poor and the identification of marks was a solid layer. Furthermore, some air bubbles were generated in the polyurethane resin layer.
This resulted in the occurrence of cracks and deterioration of transparency.

[Brief explanation of the drawing]

1 and 2 are longitudinal ffr 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 indicates a base, 2 indicates a polyurethane resin coating layer, 3 indicates a polyurethane resin coating layer, 4 indicates a primer layer, 5 indicates a lacquer layer, 6 indicates an approach section, and 7 indicates a binder section. Figure 1

Claims (1)

[Claims] 1. A method for repairing a bowling lane, which comprises applying an epoxy resin layer to the base of the bowling lane, and then applying a polyurethane resin that has been degassed under reduced pressure. 2. The bowling lane repair method according to claim 1, wherein the epoxy resin is one to which a thixotropic agent is added. 3. The bowling lane repair method according to claim 1, wherein the epoxy resin layer has a thickness of 0.1 to 0.3 mm, and the polyurethane resin layer has a thickness of 2 to 10 mm. 4. A bowling lane repaired by the repair method of claim 1. 5. Bowling lane repair characterized by being a two-component polyurethane resin consisting of an isocyanate group-containing urethane prepolymer, a polyol, and a solvent, with a solvent content of 5% by weight or less and a viscosity of 1000 to 3000 centipoise (25°C) Material.