JP2021080340A - Coating agent for enhancing impact resistance of wooden member and vehicular loading space using the same - Google Patents

Abstract

To provide a coating agent capable of applying to various wooden members, exhibiting excellent impact resistance over a long time, capable of relieving from complexity of maintenance, and for enhancing impact resistance of a wooden member and a vehicular loading space using the same.SOLUTION: The coating agent for enhancing the impact resistance of the wooden member of the present invention includes an A agent containing a polyol component and a B agent containing a polyisocyanate component independently. The coating agent of the present invention is applied to the wooden member in the state of an uncured mixture of the A and B agents, and the mixture is cured to form a coating layer on the wooden member. As a result, the impact resistance of the wooden member can be enhanced, and it can be used, for example, as a vehicle loading space.SELECTED DRAWING: Figure 1

Description

The present invention relates to a coating agent for enhancing the impact resistance of a wooden member and a vehicle carrier using the same.

For freight vehicles (for example, trucks), high-strength and hard wood-based materials such as Apiton are used for the cargo bed from the viewpoints of improving the loadability of cargo, low weight, and low cost. Furthermore, in recent years, as the demand for the freight vehicle has increased along with the increase in absolute physical distribution, and the forest resources that can be cut down have tended to be limited, bamboo wood, which is easier to obtain than Apiton wood, is used. There is also a tendency to substitute for vehicle carriers.

A vehicle carrier made of wood-based material is used for a relatively long period of time while being mounted on a vehicle. However, these wood-based materials can be scratched or damaged during use due to the weight of the cargo or the impact of loading or transportation. Alternatively, the moisture flowing out of the cargo, rain, and moisture in the air may cause putrefaction. If these are left for a long period of time, undesired scratches or defects will be generated on the surface of the loading platform, which will not only make it difficult to place the cargo in a stable manner, but may also worsen the working environment of the worker.

From this point of view, Patent Document 1 describes that the rough surface of the wood-based material plate constituting the vehicle carrier is first primed, and then the surface of the wood-based material is protected by arranging a polyurethane urea resin layer. doing. In the primer treatment of Patent Document 1, a two-component urethane resin cured product or a two-component epoxy resin cured product is arranged on the rough surface of the wood-based material plate.

However, the arrangement of the polyurethane urea resin layer as described in Patent Document 1 requires a special and expensive coating device. In this respect, it is not always excellent in versatility.

In addition, in order to arrange the polyurethane urea resin layer, primer treatment is required first. Therefore, for example, when a vehicle once coated with these coatings is to be coated again for maintenance, it is first applied. The polyurethane urea resin layer and the primer layer that have been added must be removed, or a primer treatment must be performed on the polyurethane urea resin layer previously applied, and a new polyurethane urea resin layer must be provided on the primer treatment. For this reason, an excessive burden is left in that maintenance becomes complicated.

Japanese Patent No. 4823382

An object of the present invention is to solve the above problems, and an object of the present invention is that it can be applied to various wooden members, exhibits excellent impact resistance over a long period of time, and has excellent impact resistance. It is an object of the present invention to provide a coating agent for enhancing the impact resistance of a wooden member and a vehicle carrier using the same, which can be freed from the complexity of maintenance.

The present invention is a coating agent for enhancing the impact resistance of a wooden member, which independently contains an agent A containing a polyol component and an agent B containing a polyisocyanate component.

In one embodiment, the wooden member is a vehicle carrier.

In a further embodiment, the vehicle carrier is composed of at least one wood component selected from the group consisting of Apiton and bamboo.

In one embodiment, the coating agent of the present invention is used by directly applying it to the wooden member without providing a primer layer.

The present invention also comprises a wooden member and a coating layer arranged on the outer surface of the wooden member, and the coating layer is composed of a mixed cured product of the A agent and the B agent of the coating agent for vehicles. It is a loading platform.

In one embodiment, the wooden member is composed of a plurality of wooden parts in which a sealing material is arranged at the joint, and a reinforcing tape is attached to the joint.

In one embodiment, the vehicle carrier of the present invention does not include a primer layer between the wooden member and the coating layer.

The present invention also includes a step of applying an uncured mixture of the above-mentioned coating agents A and B on a wooden member, and a step of curing the uncured mixture to obtain a coating layer. This is a method for improving impact resistance.

According to the present invention, it is possible to easily manufacture a vehicle carrier having excellent impact resistance. Further, the coating agent of the present invention does not require a special coating device, and can be applied to a wooden member by using a general-purpose coating means such as a trowel, a spatula, and a roller. Since the coating agent of the present invention can also be repeatedly layered to form a coating film, it can be directly applied onto a coating film deteriorated by use, and maintenance of the loading platform is easy.

It is sectional drawing which shows an example of the loading platform for a vehicle of this invention. It is sectional drawing which shows the other example of the loading platform for a vehicle of this invention. It is a schematic diagram for demonstrating the manufacturing procedure of the vehicle carrier of this invention. It is a photograph of the wooden sample showing the result of the impact resistance test of the wooden sample obtained in Examples and Comparative Examples. It is a photograph of the wooden sample showing the result of the impact resistance test after the moisture resistance test of the wooden sample obtained in Examples and Comparative Examples.

Hereinafter, the present invention will be described in detail.

(Coating agent)
The coating agent of the present invention contains the agent A and the agent B independently.

The coating agent of the present invention is a two-component coating agent that forms a strong coating film through curing by mixing. The term "containing agents A and B independently" as used herein means that an agent A and an agent B are not yet mixed, that is, a cured product of an agent A and an agent B is formed. Refers to the state before.

The agent A constituting the coating agent of the present invention contains a polyol component.

The polyol component contained in the agent A can function as a curing agent for the polyisocyanate component contained in the agent B described later. Examples of the polyol component include ester-based polyols (for example, ester-based diols) and ether-based polyols (for example, ether-based diols).

In one embodiment, the polyol component that can be contained in the agent A preferably includes polyoxyalkylene glycol having an average molecular weight of 2000 to 4000 (for example, polyoxypropylene glycol).

The viscosity of the agent A is not necessarily limited, but is preferably 4000 mPa · sec (25 ° C.) to 11000 mPa · sec (25 ° C.), more preferably 5000 mPa · sec (25 ° C.) to 10000 mPa · sec (25 ° C.).

The agent B constituting the coating agent of the present invention contains a polyisocyanate component.

The polyisocyanate component contained in Agent B is, for example, a polyurethane prepolymer (main agent), and specific examples thereof include polyols such as ester-based polyols (for example, ester-based diols) and ether-based polyols (for example, ether-based diols). And polyisocyanates such as aromatic polyisocyanates (for example, aromatic diisocyanates) and aliphatic polyisocyanates (for example, aliphatic diisocyanates).

In one embodiment, the polyurethane prepolymer that can be contained in the agent B includes polyoxyalkylene glycol (for example, polyoxypropylene glycol) having an average molecular weight of 2000 to 4000 as polyols, and unmodified as polyisocyanates. And / or reaction with modified diphenylalcan diisocyanate (eg, unmodified and / or modified diphenylmethane diisocyanate such as diphenylmethane diisocyanate or methylenebis (4,1-phenylene) = diisocyanate) at a predetermined NCO / OH equivalent ratio. The ones that have been made can be mentioned. The polyurethane prepolymer may contain a phthalic acid-based and / or isophthalic acid-based plasticizer.

The viscosity of the agent B is not necessarily limited, but is preferably 50 mPa · sec (25 ° C.) to 250 mPa · sec (25 ° C.), more preferably 75 mPa · sec (25 ° C.) to 225 mPa · sec (25 ° C.).

In the coating agent of the present invention, both the agent A and the agent B may contain water or an organic solvent (for example, toluene) as a solvent. Alternatively, both Agent A and Agent B may be solvent-free. Furthermore, both Agent A and Agent B may contain additives other than the above (for example, pigments, antifoaming agents, leveling agents). The contents of these solvents and other additives that can be contained in Agents A and B are not particularly limited, and appropriate amounts can be selected by those skilled in the art.

As the agent A and the agent B constituting the coating agent of the present invention, for example, a commercially available two-component polyurethane resin coating material can be used. Conventionally, such a two-component polyurethane resin paint has been used for painting concrete surfaces such as buildings and factories. As a specific example, "Isamu Floor G Hard" manufactured by Isamu Paint Co., Ltd. "Is mentioned.

The coating agent of the present invention is used to improve the impact resistance of a wooden member.

Here, the term "wooden member" used in the present specification includes the whole processed or molded wood-based plant as a raw material, for example, a preparation (for example, cut out from one log to a predetermined size). Wood (for example, lumber) or solid wood; wood-based materials (eg, laminated wood, plywood, particle board, fiber board, oriented strand board); wood flour and thermoplastic, laminated with small dimensions without adhesive or adhesive. A wood-based resin obtained by kneading a resin or a heat-curable resin; a plate material, a square material, and other members having a predetermined shape (these square materials, the plate material, and other members are individually separated into simply "wood parts". ”), As well as combinations thereof.

The woody plants that make up the wooden members are not necessarily limited, but for example, red pine, black pine, ichii, ginkgo, inumaki, ezo pine, kaya, karamatsu, koyamaki, sawara, sugi, bamboo, tsuga, togasawara, todomatsu, rat, Hinoki, Hiba, Himekomatsu, Fir, Aodamo, Aohada, Akagashi, Asada, Ismoki, Itayakaede, Inuenju, Egonoki, Onigurumi, Kaki, Katsura, Kihada, Kiri, Kusunoki, Kuri, Keyaki, Kojii, Sakura, Sawagurumi White oak, white birch, tabnoki, tsuge, tochinoki, doronoki, fake acacia, sen, harigiri, harnile, hannoki, beech, hoonoki, macamba, mizuki, mizunara, mizume, yachidamo, yanagi, yamaguwa, agachisu, oak Pine, Southern Yellow Pine, Spruce, Taihi, Beisugi, Batesga, Beihi, Beihiba, Beimatsu, Beimomi, Benimatsu, Hongsun, Hokuyokaramatsu, Ponderosa Pine, Radiata Pine, Merck Sea Pine, Mexican Cypress, Redwood, Lodge Ball Pine, Acacia Man Guum, Asobe, Apiton, African Mahogany, Alvisia, Yellow Birch, Yellow Poplar, Yellow Melanchi, Ipe, Iroko, Elima, Oakme, Obeche, Older, Kapoor, Capoc, Camerele, Karin, Carofilm, Gubas, Gerongan, Kempas , Cordia, Kokutan, Cocrojua, Coco palm, Rubber tree, Sapelli, Jelton, Jara, John Con, Silver Beach, Spanish Cedar, Scepter, Soft Maple, Dark Red Melanchi, Town, Dao, Tagayasan, Teak, Nato, Hard Maple, Basswood, Barça, beach, hickory, bubinga, ply, black walnut, black cherry, black bean, pelpok, white ash, white oak, white meranti, macole, mahogany, malas, mansonia, menina, mersawa, melbau, mengeris, monkey pot , Light red meranchi, lapra, ramin, lignum baita, red oak, and rosewood. In the present invention, the wooden member is preferably a loading platform for vehicles such as trucks, trains (freight cars), turret trucks, and carts, because a wooden member having improved impact resistance is particularly desired. It is more preferable that the vehicle carrier is composed of Apiton wood, bamboo wood, or a combination thereof.

The coating agent of the present invention may or may not be provided with a primer layer in advance when applied to such a wooden member. The coating agent of the present invention can be applied to the wooden member because it can reduce the complicated work for the primer treatment, but does not cause a substantial difference in impact resistance and the appearance of the coating film. It is preferable not to arrange the primer layer in advance for the application.

(Vehicle carrier)
FIG. 1 is a cross-sectional view showing an example of a vehicle carrier of the present invention.

As shown in FIG. 1, the vehicle carrier 100 of the present invention includes a wooden member 110 and a coating layer 120 arranged on the surface of the wooden member 110. The wooden member 110 is a member processed or molded for a vehicle carrier made of the above materials.

The coating layer 120 is composed of a mixed cured product of the A agent and the B agent of the coating agent. In the mixed cured product of the agent A and the agent B, the polyol component contained in the agent A reacts with the polyisocyanate component contained in the agent B by mixing the agent A and the agent B of the coating agent. It is a coating film of a cured polyurethane resin.

The thickness of the coating layer 120 (coating film) is not necessarily limited, but is preferably 0.8 mm to 2.5 mm, more preferably 1.0 mm to 2.0 mm, and the thickness of the coating layer 120 is 0.8 mm. If it is less than the above value, it may not be possible to provide sufficient cushioning property to the wooden member 110, and the impact resistance may be inferior. When the thickness of the coating layer 120 exceeds 2.5 mm, the impact resistance to the wooden member 110 is not significantly changed, but rather the productivity of the loading platform may be lowered in that a large amount of the coating agent is used.

In the vehicle carrier 100 of the present invention, as shown in FIG. 1, the wooden member 110 and the coating layer 120 are in direct contact with each other, and the primer layer is not included between them. For example, even if a recess 112 such as a scratch is present in a part of the wooden member 110, the coating layer 120 can directly cover the recess 112 to form a substantially smooth coating film surface 113. From this, the vehicle carrier 100 of the present invention has an excellent appearance regardless of the surface condition of the wooden member 110.

Further, in the vehicle carrier 100 of the present invention, a top coat layer (not shown) may be provided on the coating film surface 113. The topcoat layer may be provided, for example, so that the coating layer 120 avoids direct exposure to UV light and / or imparts water resistance. The material constituting the top coat layer may be, for example, a polyurethane resin coating material having excellent weather resistance.

FIG. 2 is a cross-sectional view showing another example of the vehicle carrier of the present invention.

In the vehicle loading platform 200 of the present invention shown in FIG. 2, the wooden member 210 is configured by arranging a sealing material 214 at a joint between two adjacent wooden parts 210a and 210b. Further, a reinforcing tape 216 is attached on the joint (the side on which the coating layer 220 is arranged). The coating layer 220 is arranged so as to completely cover the recesses 212 such as scratches existing on the surfaces of the reinforcing tape 216 and the wooden member 210 (specifically, the wooden part 210a). As a result, the coating film surface 213 of the coating layer 220 can have a substantially smooth surface, and the vehicle carrier 100 of the present invention has a plurality of wooden members constituting a wooden member 110 composed of a plurality of wooden parts 210a and 210b. The parts 210a and 210b are firmly fixed and have an excellent appearance regardless of the surface condition thereof.

(Manufacturing method of vehicle carrier)
The method for manufacturing the vehicle carrier of the present invention will be described.

First, as shown in FIG. 3A, a plurality of wooden parts 310a, 310b, 310c, 310d, 310e, 310f are arranged so as to form one plane, and the gaps 318a, 318b, 318c of the wooden parts are arranged. , 318d, 318e, a known sealing material is placed at the joints by means well known to those skilled in the art.

Next, known reinforcing tapes 314a, 314b, 314c, 314d, 314e are attached to the joints to which the sealing material is applied, and a plurality of wooden parts 310a, 310b, 310c, 310d, 310e, 310f are fixed to each other. The member 310 is manufactured ((b) in FIG. 3).

After that, as shown in FIG. 3C, the coating agent A of the present invention was applied onto the wooden member 310 (for example, on the surface to which the reinforcing tapes 314a, 314b, 314c, 314d, 314e were attached). An uncured mixture 315 with Agent B is provided. The uncured mixture of the agent A and the agent B shown in FIG. 3 (c) is produced by mixing the agent A and the agent B so as to be substantially uniform immediately before the application on the wooden member 310. .. Since the reaction (curing) is started by mixing the agent A and the agent B, it is preferable to quickly apply the agent to the wooden member 310.

The application of the uncured mixture 315 onto the wooden member 310 may be performed by a spraying device for coating a polyurethane resin paint or a high-pressure mixed spraying device, or may be directly brushed. The amount (coating amount) of the uncured mixture 315 applied onto the wooden member 310 is not necessarily limited, but is preferably 0.7 kg / m ^{2 to} 2.5 kg / m ² , more preferably 1.0 kg / m. ^{It is 2 to} 2.0 kg / m ² . If the amount of the uncured mixture 315 applied onto the wooden member 310 is ^{less than 0.7 kg / m 2} , a coating layer having a sufficient thickness cannot be obtained and an appropriate resistance to the obtained vehicle carrier. Impact resistance may not be obtained. When the amount of the uncured mixture 315 applied onto the wooden member 310 ^{exceeds 2.5 kg / m 2} , a coating layer having a sufficient thickness can be obtained, but the impact resistance of the obtained vehicle carrier is that. This does not change, but rather may reduce productivity.

Then, when the uncured mixture 315 is left to cure until it is cured, a vehicle carrier 300 in which the coating layer 320 is arranged on the wooden member 310 can be obtained.

In this way, the vehicle carrier can be manufactured.

(Method for increasing the impact resistance of wooden members)
The impact resistance of the wooden member is determined by applying an uncured mixture of the coating agents A and B of the present invention to the wooden member, as illustrated in the above description of the method for manufacturing a vehicle carrier, and then applying the uncured mixture. It can be enhanced by curing the uncured mixture to form a coating layer on the wooden member.

The coating layer formed by the method of the present invention is a coating film of a polyurethane resin, which itself has an appropriate cushioning property. As a result, even if an impact is applied to the coating layer from the outside, the coating layer acts as a cushion to absorb and disperse the impact, and damage or dents on the wooden member can be prevented. Therefore, when the wooden member is, for example, a cargo bed for a vehicle, it is possible to prevent the cargo bed from being damaged or an undesired dent from being generated when the cargo is loaded or unloaded or unexpectedly dropped.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples.

(Example 1: Preparation of wooden sample (E1))
A flat plate made of two Apiton materials measuring 10 cm x 10 cm x 1.8 cm (one flat plate is provided with a hozo to enable joining to each other at the joints, and the other flat plate is provided with a hozo. A one-component urethane-based sealing material (urethane seal S700NB manufactured by Cemedine Co., Ltd.) was placed at the joint portion and bonded together. On the other hand, the A and B agents of the polyurethane resin paint (“Isamu Floor G Hard” manufactured by Isamu Paint Co., Ltd.) composed of the A agent containing a polyol component and the B agent containing a polyisocyanate component can be uniformly and briefly applied. Mixed. Before this is cured, it is applied to a flat surface obtained by combining the above-mentioned Apiton materials with a rubber spatula (manufactured by Otsuka Brush Manufacturing Co., Ltd.) at ^{a coating amount of 1.0 kg / m 2} , and a wooden having a cured coating layer. A sample (E1) was prepared. The thickness of the coating layer of this wooden sample (E1) was measured using a constant pressure thickness measuring device (PG-20 manufactured by Teclock Co., Ltd.), and it was found that the coating film had a coating film in the range of 0.9 mm to 1.1 mm. confirmed.

The obtained wooden sample (E1) was evaluated as follows.

(Appearance evaluation)
The coated surface of the obtained wooden sample was visually observed and classified according to the following criteria in comparison with the Apiton material without the coating layer:
"○" ... A substantially smooth coating film was formed without pinholes.
"Δ": There were no pinholes, and the surface was somewhat rough, but a coating film that could withstand use was formed.
“X”: A coating film was formed in which pinholes were conspicuous and could not be said to be suitable for use.

(Adhesion test)
Obtained by attaching a 4 cm x 4 cm iron attachment to a wooden sample with an epoxy resin adhesive (Quick Mender # 16351 manufactured by Konishi Co., Ltd.) and using a simple tensile tester (R-20000ND manufactured by Sanko Techno Co., Ltd.). The adhesive strength between the wooden member and the coating layer (adhesive strength of the coating layer to the wooden member (N / mm ² )) was measured in the wooden sample.

(Impact resistance test)
The obtained wooden sample was tested according to JIS K 5600-5-3 (DuPont type) with each weight of "500 g and 30 cm", "500 cm and 50 cm" and "1 kg and 50 cm". After dropping the weight onto the coating layer, the surface condition of the coating layer was observed and photographed, and classified according to the following criteria:
"○": Although there was a dent on the surface, there was no crack in the coating film or the wooden member.
"Δ": There was a dent on the surface, and there were fine cracks in the coating film or the wooden member.
"X": There was a dent on the surface, and there was a crack that was clearly visible on the coating film or the wooden member.

(Adhesion test after moisture resistance test)
The obtained sample was placed in a predetermined humidity environment in accordance with JIS K 5600-7-2 for 10 days, and then a 4 cm x 4 cm iron attachment was attached to an epoxy resin adhesive (Quick Mender # 16351 manufactured by Konishi Co., Ltd.). ), And using a simple tensile tester (R-20000ND manufactured by Sanko Techno Co., Ltd.), the adhesive force between the wooden member and the coating layer in the obtained wooden sample (coating layer for the wooden member). Adhesive strength (N / mm ² )) was measured.

(Impact resistance test after moisture resistance test)
The obtained sample was placed in a predetermined humidity environment according to JIS K 5600-7-2 for 10 days, and then this wooden sample was subjected to JIS K 5600-5-3 (DuPont formula). A test was conducted for each of the "500 g and 30 cm", "500 cm and 50 cm", and "1 kg and 50 cm" weights, and the surface condition of the coating layer after the weights were dropped onto the coating layer was observed and photographed. Taken and classified according to the following criteria:
"○": Although there was a dent on the surface, there was no crack in the coating film or the wooden member.
"Δ": There was a dent on the surface, and there were fine cracks in the coating film or the wooden member.
"X": There was a dent on the surface, and there was a crack that was clearly visible on the coating film or the wooden member.

(Abrasion resistance test)
For the obtained wooden sample, a wooden pallet piece cut to a size of 2 cm × 2 cm was attached to the friction element using a Gakushin type friction fastness tester (manufactured by Tester Sangyo Co., Ltd. (model number: AB-301)). The friction element was reciprocated 1000 times on the plane on which the coating layer was arranged, and the state of the plane thereafter was visually observed.

The results obtained are shown in Table 1 and FIGS. 4-5.

(Example 2: Preparation of wooden sample (E2))
A wooden sample (E2) having a cured coating layer was prepared in the same manner as in Example 1 except that the coating amount of the polyurethane resin paint ^{was changed to 1.5 kg / m 2.} The thickness of the coating layer of this wooden sample (E2) was measured in the same manner as in Example 1, and it was confirmed that the wood had a coating film in the range of 1.4 mm to 1.6 mm.

The obtained wooden sample (E2) was evaluated in the same manner as in Example 1, and the obtained results are shown in Table 1 and FIGS. 4 to 5.

(Example 3: Preparation of wooden sample (E3))
A wooden sample (E3) having a cured coating layer was prepared in the same manner as in Example 1 except that the coating amount of the polyurethane resin paint ^{was changed to 2.0 kg / m 2.} The thickness of the coating layer of this wooden sample (E3) was measured in the same manner as in Example 1, and it was confirmed that the wood had a coating film in the range of 1.9 mm to 2.1 mm.

The obtained wooden sample (E3) was evaluated in the same manner as in Example 1. The results obtained are shown in Table 1 and FIGS. 4-5.

(Comparative example 1: Preparation of wooden sample (C1))
A wooden sample (C1) made of Apiton material was obtained in the same manner as in Example 1 except that the polyurethane resin paint was not applied.

The obtained wooden sample (C1) was evaluated in the same manner as in Example 1. The results obtained are shown in Table 1 and FIGS. 4-5.

As shown in Table 1 and FIGS. 4 to 5, the wooden samples (E1) to (E3) produced in Examples 1 to 3 have excellent impact resistance as compared with the sample (Apiton material) of Comparative Example 1. Had. This tendency was also the same in the results of the impact resistance test after each wooden sample was exposed to the moisture resistance test. Further, the wooden samples (E1) to (E3) produced in Examples 1 to 3 are also excellent in wear resistance as compared with the sample (Apiton material) of Comparative Example 1, and are slightly due to the reciprocation of the friction element. Although scars were confirmed, the joint portion was not cracked as in Comparative Example 1. From this, it can be seen that the wooden samples (E1) to (E3) produced in Examples 1 to 3 can be used as a vehicle carrier instead of the Apiton material.

100,200,300 Vehicle bed 110,210,310 Wooden members 120,220,320 Coating layers 210a, 210b Wooden parts 212 Recesses 213 Coating surface surface 214 Sealant 216 Reinforcing tape 315 Uncured mixture

Claims (8)

A coating agent for enhancing the impact resistance of a wooden member, which independently contains an agent A containing a polyol component and an agent B containing a polyisocyanate component. The coating agent according to claim 1, wherein the wooden member is a vehicle carrier. The coating agent according to claim 2, wherein the vehicle carrier is composed of at least one kind of wood parts selected from the group consisting of Apiton wood and bamboo wood. The coating agent according to any one of claims 1 to 3, which is used by directly applying it to the wooden member without providing a primer layer. For vehicles, which comprises a wooden member and a coating layer arranged on the outer surface of the wooden member, and the coating layer is composed of a mixed cured product of the coating agent A and B according to claim 1. Loading platform. The vehicle carrier according to claim 5, wherein the wooden member is composed of a plurality of wooden parts in which a sealing material is arranged at the joint, and a reinforcing tape is attached to the joint. The vehicle carrier according to claim 5 or 6, which does not include a primer layer between the wooden member and the coating layer. A wooden member comprising a step of applying an uncured mixture of the coating agent A and the agent B according to claim 1 onto the wooden member, and a step of curing the uncured mixture to obtain a coating layer. A method for increasing impact resistance.

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