JP5529808B2 - Vehicle flooring and repair method thereof - Google Patents

Description

The present invention relates to a vehicle flooring and a repair method thereof.

  As a vehicle floor material such as a truck floor material, a high-strength wood such as hardwood Apiton is widely used from the viewpoint of cargo loadability, weight, cost, and the like.

  When attaching such flooring to a vehicle, it is common to attach a joist that combines horizontal and vertical members on the chassis of the vehicle, spread the flooring on this, and fix it to the joist with screws or the like. is there.

  In Patent Document 1, a prepreg sheet in which a thermosetting resin is impregnated on a sheet base material that can be impregnated with a resin is superposed on at least the surface of a wood-based core material, and the laminate is heated and pressed to form a surface layer. A vehicular flooring having a shape formed therein is disclosed.

JP 2001-239615 A

  Since the vehicle flooring is used for a long period of time while being mounted on a vehicle, scratches and defects are likely to occur at the time of use. Eventually not suitable for use.

  Therefore, repair of the vehicle flooring is required, but with the vehicle flooring as disclosed in Patent Document 1, it is difficult to repair the vehicle mounted on the vehicle. The flooring material must be removed and processed in a dedicated factory, and it is necessary to reattach it after processing. Therefore, such a vehicle flooring has a drawback that it requires labor and a lot of cost to maintain it.

  On the other hand, a steel plate flooring is also affixed on an existing flooring. However, this method is expensive and excessively increases the weight of the vehicle. The actual load capacity will decrease. In addition, there are also environmental impacts associated with the deterioration of fuel efficiency and problems of re-acquisition of vehicle registration due to an increase in vehicle weight.

Accordingly, an object of the present invention is a vehicle flooring that is excellent in wear resistance and impact resistance, exhibits durability over a long period of time, and is overwhelmingly lighter than a steel plate, and has a scratch on the surface. It is an object of the present invention to provide a vehicle flooring that can exhibit the above characteristics even when a wood material having a defect is used and can be repaired in a state of being mounted on the vehicle. Another object of the present invention is to provide a method for repairing such a vehicle flooring.

  The present invention comprises a wood material plate having at least one of the main surfaces being a rough surface, a base layer formed on the rough surface of the wood material plate, and a polyurethane urea resin layer formed on the base layer. Provided is a vehicle flooring.

  The vehicle floor material of the present invention has a characteristic layer structure in which a base material layer is provided on a rough wood material plate and a polyurethane urea resin layer is provided thereon. The adhesiveness to the board becomes strong, and the layer made of the same resin does not peel off over time, and the wood material board is protected for a long time. Moreover, since the interlayer adhesive strength is high, the high wear resistance of the polyurethane urea resin can be maintained over a long period of time.

  Accordingly, durability against friction with cargo during loading and unloading can be improved, and maintenance properties such as weather resistance and cleaning can be improved.

  In addition, since the wood material is used, it is overwhelmingly lighter than a steel plate and does not significantly increase the vehicle weight. Furthermore, since it exhibits the slip resistance equivalent to that of a wood material such as Apiton material, no sliding peculiar to the resin is seen, and loading can be performed satisfactorily.

  Furthermore, since the underlayer can be formed at room temperature, and the polyurethane urea resin can be formed by reaction at room temperature, it is possible to repair the floor material on the vehicle.

  The underlayer is preferably made of urethane resin and / or epoxy resin, and the underlayer is formed on the first underlayer formed on the rough surface and having the smoothed surface, and on the smoothed surface of the first underlayer. It is particularly preferable that the second underlayer is formed.

  When the above material is used as the underlayer, the adhesion to the polyurethane urea resin is particularly improved, and the wear resistance, impact resistance and durability can be particularly improved. Further, by dividing the underlayer into the first underlayer and the second underlayer as described above, the former can be provided with a putty-like function for smoothing the rough surface, and the first underlayer and polyurethane can be imparted to the latter. The function as a primer layer which improves the adhesive force with a urea resin layer can be provided.

  The second underlayer may contain Portland cement powder. Further, if the first underlayer is made of a resin for the first underlayer selected from the group consisting of a two-component urethane resin cured product and a two-component epoxy resin cured product, the function of the first underlayer is further improved. If the second underlayer is made of a second underlayer resin selected from the group consisting of a one-part moisture-curing urethane resin cured product and a two-part epoxy resin cured product. The function as a primer is improved. Therefore, the wear resistance, impact resistance, and durability of the floor material as a whole are significantly improved.

  The first base layer resin before curing preferably has a higher viscosity than the second base layer resin before curing. By using the first base layer resin having a high viscosity, it is possible to cope with a rough surface, and the interlayer adhesion is improved.

  As the polyurethane urea resin constituting the polyurethane urea resin layer, it is preferable to use a reaction product of a polyurethane prepolymer and a polyamine, or a reaction product of a polyurethane prepolymer, a polyamine and a polyol. In this case, the polyurethane urea resin layer can contain at least one of an antibacterial agent, a deodorant and a light stabilizer.

From the viewpoint of wear resistance, impact resistance and durability, the polyurethane urea resin layer preferably has a tensile strength of 5 N / mm ² or more, an elongation of 150% or more, and a tensile product of 700 N / mm or more. is there.

  The vehicle flooring may be made of a woody material with scratches or defects. That is, the rough surface may be formed by scratches or defects on the surface of the wood material plate, or gaps between joint portions of the plurality of wood material plates.

  In addition, as a wood material board, the use of a plywood having an Apiton single plate on the surface, a board material made of a laminated material containing Apiton, or a board material made of a solid Apiton material, the high durability and heavy thickness of Apiton are exhibited. Therefore, it is suitable as a vehicle flooring.

  A top coat layer may be formed on the polyurethane urea resin layer. This topcoat layer is preferably provided with a function such as prevention of ultraviolet rays, whereby the durability is remarkably improved.

This invention provides the repair method of the flooring material other than the vehicle flooring mentioned above. That is, the present invention provides an underlayer forming step of forming an underlayer by laminating and curing an unreacted urethane resin and / or an epoxy resin on a rough surface of a wood material plate in which at least one of the main surfaces is a rough surface. And a polyurethane urea resin layer forming step in which a polyurethane urea resin layer is formed by laminating and curing a mixture containing a polyurethane prepolymer and a polyamine, or a mixture containing a polyurethane prepolymer, a polyamine and a polyol on an underlayer. Provided is a method for repairing a vehicle flooring.

  The underlayer forming step includes a first underlayer forming step of forming a first underlayer by laminating and curing an unreacted two-component urethane resin or two-component epoxy resin on the rough surface; In addition, it is preferable to form a second base layer forming step of forming a second base layer by laminating and curing an unreacted one-part moisture-curable urethane resin or two-part epoxy resin. As a result, the underlayer becomes two layers and the above-described effects are exhibited.

  The said mixture containing a polyurethane prepolymer and a polyamine, or the said mixture containing a polyurethane prepolymer, a polyamine, and a polyol can be laminated | stacked by spray application, for example.

  In addition, after the polyurethane urea resin layer forming step, a top coat layer forming step is performed in which a highly weather-resistant two-component urethane resin is laminated and cured on the polyurethane urea resin layer to form a top coat layer. Further improved vehicle flooring may be obtained.

According to the present invention, it is a vehicle flooring that is excellent in wear resistance and impact resistance, exhibits durability over a long period of time, and is overwhelmingly lighter than a steel plate, and has a defect such as a scratch on the surface. The present invention provides a vehicle flooring that can exhibit the above-described characteristics even when a wood material having a certain thickness is used, and that can be repaired in a state of being mounted on a vehicle, and a repair method thereof.

  Specifically, the weight reduction is as follows. That is, when a polyurethane urea resin layer having a thickness of about 2 mm is formed on a truck bed (an area of about 23 m 2), the total weight increase is about 59 kg for a new vehicle and about 74 kg even when the flooring is severely damaged. However, when a steel plate of about 2 mm is used, the weight increases by 400 kg or more. By carrying out the present invention, coating can be performed with a slight increase in weight, which leads to reduction of fuel such as gasoline, and the effect is great in consideration of economic and environmental loads.

  In addition, since the polyurethane urea resin layer is formed by coating, the loading platform can be easily cleaned and dried in a short time, and the loading platform can always be kept sanitary and safe with simple maintenance. It also contributes to reducing the burden on the shipping company and shortening the repair time.

It is sectional drawing of the flooring for vehicles which concerns on 1st Embodiment. It is sectional drawing of the flooring for vehicles which concerns on 2nd Embodiment. It is sectional drawing of the flooring for vehicles which concerns on 3rd Embodiment. It is sectional drawing of the flooring for vehicles which concerns on 4th Embodiment. It is sectional drawing of the flooring for vehicles which concerns on 5th Embodiment. It is sectional drawing of the flooring for vehicles which concerns on 6th Embodiment. It is sectional drawing of the flooring for vehicles which concerns on 7th Embodiment. It is sectional drawing of the flooring for vehicles which concerns on 8th Embodiment. It is sectional drawing of the flooring for vehicles which concerns on 9th Embodiment.

  Hereinafter, preferred embodiments will be described with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted. In addition, the drawings are exaggerated for easy understanding, and the dimensional ratios do not necessarily match those described.

  FIG. 1 is a cross-sectional view of a vehicle flooring according to the first embodiment. A vehicle floor material 101 shown in FIG. 1 includes a base material layer 4 on a rough surface of a wood material plate 2 having a rough surface (notch-shaped) on one of main surfaces, and polyurethane on the base material layer 4. The urea resin layer 6 is provided.

  FIG. 2 is a cross-sectional view of the vehicle flooring according to the second embodiment. A vehicle flooring 102 shown in FIG. 2 includes a base layer 4 on a rough surface of a wooden material plate 2 having a rough surface (not shown) on one of the main surfaces. A polyurethane urea resin layer 6 is provided on the plate 2. In the first embodiment, the underlayer 4 covers the entire rough surface of the wood material plate 2, whereas in the second embodiment, the underlayer 4 is filled in the concave portion of the rough surface of the wood material plate 2. Yes.

  FIG. 3 is a cross-sectional view of the vehicle flooring according to the third embodiment. The vehicle flooring 103 shown in FIG. 3 has a first ground layer 4a and a second ground layer 4b on the rough surface of the wood material plate 2 having a rough surface (notch-shaped) on one of the main surfaces. And a polyurethane urea resin layer 6 on the second underlayer 4b.

  FIG. 4 is a cross-sectional view of the vehicle flooring according to the fourth embodiment. The vehicle flooring 104 shown in FIG. 4 has a first ground layer 4a and a second ground layer 4b on the rough surface of the wood material plate 2 having a rough surface (not shown) on one of the main surfaces. And a polyurethane urea resin layer 6 on the second underlayer 4b. In the third embodiment, the first underlayer 4a covers the entire rough surface of the wood material plate 2, whereas in the fourth embodiment, the first underlayer 4a is a concave portion of the rough surface of the wood material plate 2. Is filled.

  FIG. 5 is a cross-sectional view of a vehicle flooring according to a fifth embodiment. The vehicle flooring 105 shown in FIG. 5 has a rough gap between the joint portions of the two wooden material plates 2, the gap is filled with the underlayer 4, and the filled underlayer 4 and the wooden material plate are filled with the gap. A polyurethane urea resin layer 6 is formed on 2.

  FIG. 6 is a cross-sectional view of a vehicle flooring according to a sixth embodiment. In the vehicle flooring 106 shown in FIG. 6, the gap between the joint portions of the two wood material plates 2 is a rough surface, and the gap is filled with the first foundation layer 4a, and the filled first foundation layer 4a is filled. And the 2nd foundation layer 4b is formed on the wood material board 2, and the 1st foundation layer 4a and the 2nd foundation layer 4b become the foundation layer 4 as a whole. A polyurethane urea resin layer 6 is formed on the second underlayer 4b.

  FIG. 7 is a cross-sectional view of a vehicle flooring according to a seventh embodiment. In the vehicle flooring 107 shown in FIG. 7, the gap between the joint portions of the two wooden material plates 2 is a rough surface, and the rough surface (notch) is also formed on the upper surface (one of the main surfaces) of the wooden material plate 2. Is shown). A base layer 4 is formed on these rough surfaces, and a polyurethane urea resin layer 6 is formed on the base layer 4.

  FIG. 8 is a cross-sectional view of a vehicle flooring according to an eighth embodiment. In the vehicle flooring 108 shown in FIG. 8, the gap between the joint portions of the two wooden material plates 2 is a rough surface, and the rough surface (notch) is also formed on the upper surface (one of the main surfaces) of the wooden material plate 2. Is shown). A base layer 4 is formed on these rough surfaces, and a polyurethane urea resin layer 6 is formed on the base layer 4 and the wood material plate 2. In the seventh embodiment, the underlayer 4 covers the entire rough surface of the wood material plate 2, whereas in the eighth embodiment, the underlayer 4 includes a rough concave portion on the upper surface of the wood material plate 2 and The gap between the joint portions of the two wooden material plates 2 is filled.

  FIG. 9 is a cross-sectional view of a vehicle flooring according to a ninth embodiment. In the vehicle flooring 109 shown in FIG. 9, the gap between the joint portions of the two wooden material plates 2 is a rough surface, and the rough surface (notch) is also formed on the upper surface (one of the main surfaces) of the wooden material plate 2. Is shown). A first underlayer 4a is formed on these rough surfaces, a second underlayer 4b is formed on the first underlayer 4a, and the underlayer 4 is formed as a whole. A polyurethane urea resin layer 6 is formed on the second underlayer 4b.

  In the above-described embodiment, the wood material plate 2 may be a plate-like material containing a wood component. However, a plywood provided with an Apiton single plate on its surface, a plate material made of a laminated material containing Apiton, and a plate material made of a solid Apiton material are preferable. The former two are particularly preferable. Apiton is a kind of southern wood and belongs to Dipterocarpus of the Dipterocarpaceae family.

  The wood material plate 2 used in the repair of the vehicle floor material is preferably one in which the surface of the floor material is polished by a polisher or the like to make the surface uneven, thereby removing the crust around the screw for fixing the floor plate. In particular, when retrofitting an existing vehicle flooring, it is preferable to remove the dirt on the floorboard together with polishing, hole filling, degreasing, etc., and dry using a jet heater or the like.

  The first ground layer 4a may be any material that can smooth the rough surface of the wood material plate 2, but the material forming the first ground layer 4a may be different depending on the rough surface of the wood material plate 2. It is preferable to select from the viewpoint of interlayer adhesion.

  For example, when the entire main surface of the first underlayer 4a is damaged, it is necessary to form the first underlayer 4a by rubbing the entire surface. In this case, a two-component type urethane coating waterproof material is suitable, and for example, Millionate C (trade name, manufactured by Hodogaya Bandex Building Materials) can be used.

  When the rough surface of the wood material plate 2 is partially cut away, a putty-like two-component urethane-coated floor material having no fluidity is suitable, for example, HC grip (trade name, manufactured by Hodogaya Bandex Building Materials). ) Can be used. When the main surface of the wood material plate 2 is severely damaged and the rough surface is rough, it is necessary to form the first base layer 4a by squeezing the entire surface. In this case, Quick E1E2 (trade name, manufactured by Nippon Special Paint Co., Ltd.), which is a quick curing type of epoxy resin, is suitable.

  The second undercoat layer 4b may be any resin as long as it can improve the adhesion between the first undercoat layer 4a and the polyurethane urea layer 6, but it is a one-component moisture-curing urethane resin cured product or a two-component epoxy. A cured resin is preferable. In addition, in order to strengthen the bond between the wood material plate 2 or the first ground layer 4a and the polyurethane urea resin layer 6, a material obtained by appropriately adding Portland cement powder may be used.

  The one-component moisture-curable urethane resin is a solvent-based one-component moisture-curable urethane resin having a resin content of about 30 to 60% by weight (particularly 49 to 51% by weight), and has a viscosity of 80 to 150 mPa · s / 20 ° C. Are preferred. The NCO content of the one-component moisture-curing urethane resin is preferably 3 to 5% (preferably 4 to 5%), and the finger-drying time is preferably about 1.5 to 2.5 (hour / 23 ° C.). . In addition, when mixing and using Portland cement, it is preferable to mix in the ratio of 1/1 by weight ratio. One-part moisture-curing urethane resin having such properties includes Millionate CB-30 (product name, manufactured by Hodogaya Bandex Building Materials).

  As the two-component epoxy resin constituting the second underlayer 4b, bisphenol A type epoxy resin, bisphenol F type epoxy resin, novolac type epoxy resin and the like are mainly used, and amine type, polyamine type and mercaptan type curing agents are applied. Two-part epoxy resins are preferred. The two-part epoxy resin may be solventless, organic solvent-based, or water-based.

  The polyurethane urea resin constituting the polyurethane urea resin layer 6 is preferably a reaction product of a polyurethane prepolymer (main agent) and a polyamine (curing agent), or a reaction product of a polyurethane prepolymer (main agent) with a polyamine and a polyol (curing agent). It is.

  As the polyurethane prepolymer as the main agent, polyols such as ester polyols (especially ester diols), ether polyols (especially ether diols), aromatic polyisocyanates (especially aromatic diisocyanates), aliphatics A polyisocyanate such as a polyisocyanate (especially an aliphatic diisocyanate), an alicyclic polyisocyanate (especially an alicyclic diisocyanate), etc., reacted with an NCO / OH equivalent ratio exceeding 1.7. It is done.

  Particularly preferred as the polyurethane prepolymer is polyoxypropylene glycol (molecular weight of about 2000 to 4000, particularly a mixture of different molecular weights) as the polyol, diphenylmethane diisocyanate and / or modified diphenylmethane diisocyanate as the polyisocyanate, and NCO. The reaction is carried out so that the / OH equivalent ratio is about 8 to 15 (particularly about 10 to 15). The polyurethane prepolymer may contain a phthalic acid-based or isophthalic acid-based plasticizer.

  The polyamine as the curing agent may be a mixture or a single substance, but preferably contains at least an aromatic polyamine. As the aromatic polyamine, dialkyltoluenediamine is preferable, and diethyltoluenediamine (DETDA) is particularly preferable.

  When the polyamine is a mixture, an aliphatic polyamine may be used in addition to the aromatic polyamine, and the polyoxypropylene diamine (molecular weight of about 2000 to 5000) is preferable as the aliphatic polyamine.

  In the case of using a mixture of polyamine and polyol as a curing agent for the polyurethane prepolymer, the polyol is preferably an aliphatic polyol, and particularly preferably polyoxypropylene ethylene glycol (molecular weight of about 2000 to 3000).

In reacting the main agent with the curing agent, the equivalent ratio of NCO / NH ₂ or NCO / (NH ₂ + OH) is preferably 0.8 to 1.4, more preferably 1.0 to 1.3. 1 to 1.2 is more preferable.

  The viscosity of the main agent before curing is preferably 400 to 700 mPa · s / 20 ° C. (particularly 500 to 600 mPa · s / 20 ° C.), and the viscosity of the curing agent before curing is 400 to 800 mPa · s / 20 ° C. (particularly 500 ˜700 mPa · s / 20 ° C.). The tack free time is preferably 5 to 60 seconds.

The polyurethane urea resin layer has a tensile strength of 5 N / mm ² or more (particularly 5 to 30 N / mm ^2, more preferably 8 to 25 N / mm ² ), and an elongation of 150% or more (particularly 150 to 700, further 200 to 600). %). The elongation at break of the polyurethane urea resin layer is preferably 200 to 600%, and the tear strength is preferably 40 to 100 N / mm. The tensile product (product of breaking strength and elongation at break) is preferably 700 N / mm or more (particularly 800 to 1500 N / mm, more preferably 900 to 1400 N / mm). The measurement can be performed according to JISA 6021.

  The wear resistance of the polyurethane urea resin layer conforms to JIS K 7204 (Plastic-Wear test method using wear wheels. Use H-22 for wear wheel type, load 9.8N, rotation speed 1000 rotations) And weight loss is 100 mg or less, and wear depth is 0.05 mm or less.

  The sliding resistance of the polyurethane urea resin layer is preferably about 90 to 130 in accordance with a test method for surface friction characteristics using an ASTM E303 British pendulum resistance tester.

  The formation of the polyurethane urea resin layer can be carried out by spray lining using a spray device dedicated to polyurethane resin coating or a high-pressure mixing spray device.

  The vehicle flooring material may have a topcoat layer, but the topcoat layer is preferably one that can reduce the arrival of ultraviolet rays at the polyurethane urea resin layer 6. Furthermore, in order to prevent infiltration of water, it is more preferable that it is provided with water resistance. The top coat layer may be applied after the primer application.

  As the top coat layer, a cured product of a two-component polyurethane resin containing a polyurethane prepolymer as a main agent and a polyol as a curing agent is suitable, and a double-end isocyanate polyurethane prepolymer is preferred as the polyurethane prepolymer. As the polyol, those containing acrylic polyol are suitable. HC Ecotop (trade name, manufactured by Hodogaya Bandex Building Materials) can be used as a material capable of forming such a topcoat layer.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not restrict | limited to these Examples.

(Abrasion comparison test)
[Example 1, Comparative Examples 1-2]
Polyurethane urea resin [based on a polyurethane prepolymer obtained by reacting diphenylmethane diisocyanate / modified diphenylmethane diisocyanate and polyoxypropylene glycol at an NCO / OH equivalent ratio = 10, and a mixture of diethyltoluenediamine and polyoxypropylenediamine as a curing agent, Reaction product reacted to have an NCO / (NH ₂ + OH) equivalent ratio = 1.2. Hereinafter, it is referred to as “polyurethane urea resin A”. ], Plywood, a general-purpose color urethane flooring (RF-2000 made by Hodogaya Bandex building materials) was subjected to a comparative test of wear resistance.

The test method was a wear test method using plastic-abrasion wheels defined in JIS K 7204. The test was performed under the conditions of a load of 9.8 N and a rotation speed of 1000 rotations using H-22 as the type of wear wheel. The test results are listed in Table 1 below. The weight loss and wear depth indicate that the smaller the numerical value, the harder the material to wear.

  From the results shown in Table 1, the polyurethane urea resin had a weight loss of about 1/9 compared to the plywood, and the wear resistance depth was about 1/20. In comparison tests with general-purpose color urethane floors, the wear depth is about 1/6, and polyurethane urea resin is suitable for durability comparison.

(Slip resistance test)
[Examples 2 to 3, Comparative Example 3]
Sliding is also an important performance for vehicle flooring. If the material is slippery, it may lead to claims such as damage to the luggage unless sufficient consideration is given to the stability of the luggage while traveling. A sliding resistance comparison test was conducted, and the results are shown in Table 2 below.

The test method is based on a test method for surface friction characteristics using an ASTM E303 British pendulum resistance tester. This test was developed by the Road Research Institute in the United Kingdom for the purpose of measuring the slip resistance of the surface, and is the method adopted by the Japan Highway Public Corporation, the Japan Road Association, and others. In addition, the larger the numerical value, the more difficult it is to slip.

  From the results in Table 2, it was found that there was no significant difference compared to wood (Apiton), and that loading could be handled with the same measures as before.

(Adhesion test)
[Examples 4 to 7]
Using an Apiton material as a wood material plate, an underlying layer made of the following material was formed on the rough surface, and a polyurethane urea resin A was formed thereon. The adhesive strength of the polyurethane urea resin layer of this flooring was measured by Kenken method (test atmosphere: 23 ° C.). The results are shown in Table 3. The Kenken-type adhesion test is a test conducted using a Kenken-type adhesion tester manufactured under the guidance of the Institute of Architecture, Ministry of Construction.

^＊保土谷バンデックス建材製ミリオネートＣＢ-３０にポルトランドセメントを１：１で混合したもの Apiton material was used as the wood material plate, and first and second underlayers made of the following materials were formed on the rough surface, and polyurethane urea resin A was formed on the second underlayer. The adhesive strength of the polyurethane urea resin layer of this flooring was measured by Kenken method (test atmosphere: 23 ° C.). The results are shown in Table 4.

^* Hodogaya Bandex building material Millionate CB-30 mixed with Portland cement 1: 1

(Comparison of loading platform durability)
When Apitoton (including plywood) is applied to a flat body, the track travel distance is 100,000 km / year or more, but under such conditions, the surface is crushed within one year. And some surface destruction is seen after 3 years. When the vehicle flooring of the present invention (Embodiment 7) is applied, the state can be kept almost unchanged from the initial state although there are slight scratches on the surface even after 3 years.

(Durability comparison by driver)
If the surface of the Apiton material is scratched 4 to 5 times with a Phillips screwdriver, it will be rolled up, dented (a step will be created), and cracked. Scratches occur, but no occurrence of burns is observed.

(Battery test with hammer)
The vehicle floor material of Example 7 (thickness of polyurethane urea resin layer: 3 mm) was hit 10,000 times with a hammer having a weight of about 1 kg, but the polyurethane urea resin layer was not peeled off from the apton material. When the Apiton material itself was struck with a hammer, it was rolled up 4-5 times, resulting in dents (steps formed) and cracks.

  From the results of the above durability tests, etc., when the upper layer of the Apitone material is coated with a coating film such as a polyurethane urea resin layer, the durability of the Apitone material is significantly improved compared to using the Apitone material alone without coating. The effect of the coating is clear.

  2 ... wood material plate, 4 ... undercoat layer, 4a ... first undercoat layer, 4b ... second undercoat layer, 6 ... polyurethane urea resin layer.

Claims (14)

An underlayer forming step of forming an underlayer by laminating and curing an unreacted urethane resin and / or an epoxy resin on the rough surface of the wood material plate, at least one of the main surfaces of which is a rough surface;
A polyurethane urea resin layer forming step of forming a polyurethane urea resin layer by laminating and curing a mixture containing a polyurethane prepolymer and a polyamine or a mixture containing a polyurethane prepolymer, a polyamine and a polyol on the underlayer. , Repair method for vehicle flooring. The repair method according to claim 1, wherein the underlayer is made of a urethane resin and / or an epoxy resin. The said foundation | substrate layer is comprised from the 1st foundation | substrate layer formed on the said rough surface and having the smoothing surface, and the 2nd foundation | substrate layer formed on the said smoothing surface of the said 1st foundation | substrate layer. Or the repair method of 2 description. The repair method according to claim 3, wherein the first foundation layer is made of a resin for a first foundation layer selected from the group consisting of a two-component urethane resin cured product and a two-component epoxy resin cured product. The repair method according to claim 3 , wherein the second underlayer is made of a resin for a second underlayer selected from the group consisting of a one-part moisture-curing urethane resin cured product and a two-part epoxy resin cured product. 5. The repair method according to claim 4 , wherein the second underlayer is made of a resin for a second underlayer selected from the group consisting of a one-part moisture curable urethane resin cured product and a two-part epoxy resin cured product. The repair method according to claim 6 , wherein the first base layer resin before curing has a higher viscosity than the second base layer resin before curing. The repair method according to any one of claims 3 to 7, wherein the second underlayer contains Portland cement powder. The polyurethane urea resin constituting the polyurethane urea resin layer is a reaction product of a polyurethane prepolymer and a polyamine, or a reaction product of a polyurethane prepolymer, a polyamine, and a polyol, according to any one of claims 1 to 8 . Repair method . The polyurethane urea resin layer, the antimicrobial agent, repair method according to any one of claim 1 to 9 containing at least one deodorant and light stabilizers. The polyurethane urea resin layer has a tensile strength of 5N / mm ² or more, elongation of 150% or more, the tensile product is 700 N / mm or more, the repair method according to any one of claims 1-10. The repair method according to any one of claims 1 to 11 , wherein the rough surface is formed by a scratch or a defect on a surface of the wooden material plate or a gap between joint portions of the plurality of wooden material plates. The wood material board, plywood comprising a Apiton veneer surface sheet made of laminated wood containing Apiton, or a plate made of Apiton solid wood, repairing method according to any one of claims 1 to 12. The polyurethane urea resin layer, repair method according to any one of claims 1 to 13, further comprising a step of forming a top coat layer.

Images