CN211164393U - Environmental protection moisture-proof blockboard - Google Patents

Abstract

The utility model discloses an environment-friendly moisture-proof blockboard, which comprises a core board, and the core board is a moisture-proof core board impregnated with urea-formaldehyde resin. In the utility model, the core board is immersed in the urea-formaldehyde resin, and the moisture-proof core board is obtained after fully curing and drying. Urea-formaldehyde resin not only evenly covers the surface of the core board, but also fully adsorbed into the wood fiber gap of the core board. After the urea-formaldehyde resin is cured, the urea-formaldehyde that penetrates into the wood fiber gap can not only improve the moisture resistance of the core board, but also in its pulling Under traction, the urea-formaldehyde resin covering the surface of the core board is not easy to peel off, and is very closely attached to the surface of the core board, which further improves the moisture-proof performance of the core board.

Description

Environmental protection moisture-proof blockboard

technical field

The utility model belongs to the technical field of blockboard production, in particular to an environment-friendly and moisture-proof blockboard.

Background technique

Blockboard refers to a special plywood made by glue pressing on the basis of plywood production, with wood slats spliced or hollow board as the core board, covered with two or more layers of plywood on both sides. Blockboard has excellent comprehensive performance. Compared with solid wood jigsaw, blockboard has the characteristics of stable structure, large format, outstanding solid wood texture, beautiful board surface, good mechanical properties, and production of high-quality wood. The demand is very large, and it is very popular in the market. It is widely used in the production and construction of furniture manufacturing, sewing machine tabletops, carriages, ships, etc.

Blockboard is more stable than solid wood board, but it is afraid of moisture, so the process requirements are very high. Not only enough space is needed to allow the wood to have sufficient time for adaptive natural drying, but also strict drying process control through a drying kiln; At present, it is usually used in a dry state. In order to expand its applicability in high temperature, high humidity and outdoor environments, it is necessary to improve its moisture resistance.

In order to solve the above problems, the Chinese utility model patent with publication number CN202530627U discloses a water-resistant and fire-resistant blockboard. The water-resistant and fire-resistant blockboard includes a blockboard body, and the body of the blockboard is wrapped around a layer of melamine resin and Phenolic resin mixed coating; the thickness of the melamine resin and phenolic resin mixed coating is 0.3-1.0 mm.

However, in a damp state, the waterproof organic coating is easily peeled off from the substrate, so simply wrapping the organic coating on the surface of the substrate cannot have an effective moisture-proof effect.

Utility model content

The purpose of the invention of the present utility model is to provide an environment-friendly and moisture-proof blockboard with good moisture-proof performance.

For realizing the above-mentioned purpose of the invention, the technical scheme of the present utility model is as follows:

An environment-friendly and moisture-proof blockboard includes a core board, and the core board is a moisture-proof core board impregnated with urea-formaldehyde resin.

As we all know, the performance of the block board depends on the performance of the core board. The utility model immerses the core board in the urea-formaldehyde resin, and obtains the moisture-proof core board after fully curing and drying. Urea-formaldehyde resin not only evenly covers the surface of the core board, but also fully adsorbed into the wood fiber gap of the core board. After the urea-formaldehyde resin is cured, the urea-formaldehyde that penetrates into the wood fiber gap can not only improve the moisture resistance of the core board, but also in its pulling Under traction, the urea-formaldehyde resin covering the surface of the core board is not easy to peel off, and is very closely attached to the surface of the core board, which further improves the moisture-proof performance of the core board.

In the above-mentioned environmental protection and moisture-proof blockboard, the thickness of the moisture-proof core board is 10-13mm.

In the above-mentioned environmental protection and moisture-proof blockboard, the surface of the moisture-proof core board is bonded with a solid wood veneer layer through a first adhesive layer, and activated carbon is dispersed in the first adhesive layer. The activated carbon is dispersed in the first adhesive layer, so that the blockboard has a certain adsorption performance for harmful gases such as formaldehyde.

In the above-mentioned environment-friendly and moisture-proof blockboard, a fumed silica layer is formed on the outer surface of the first adhesive layer. The formation process of the first adhesive layer with the fumed silica layer is as follows: fully wet the activated carbon with water, add it into the adhesive, and add fumed silica at the same time; , the water in the pores of the activated carbon evaporates, forming air channels in the activated carbon adhesive layer, and the flocculent fumed silica is suspended on the surface of the first adhesive layer to form a fumed silica layer, which is outside the first adhesive layer. A porous structure is formed on the surface, and the porous structure is connected with the pores of the activated carbon through the air passages formed by the evaporation of water, which ensures that the activated carbon can circulate and contact with the external air, and further improves the formaldehyde adsorption performance of the blockboard.

In the above-mentioned environment-friendly and moisture-proof blockboard, the moisture-proof core board has a rough surface. The rough surface enables a larger bonding surface between the moisture-proof core board and the first adhesive layer, and increases the adsorption amount of the first adhesive layer to the free formaldehyde released by the moisture-proof core board.

The rough surface can be formed in the following way: in the above-mentioned environmental protection and moisture-proof blockboard, the surface of the moisture-proof core board is formed with several grooves arranged in parallel.

In the above-mentioned environmental protection and moisture-proof blockboard, the moisture-proof core board is formed by splicing a plurality of wooden strips, and the grooves are evenly arranged along the length direction of the wooden strips. On narrow strips, it is more convenient to arrange the grooves along the length of the strip.

In the above-mentioned environment-friendly and moisture-proof blockboard, on the adjacent wooden strips, the grooves are arranged in dislocation. In this way, the adhesion between the moisture-proof core board and the first adhesive layer can be further improved, and the effect of the addition of activated carbon on the adhesion of the two can be avoided.

In the above-mentioned environment-friendly and moisture-proof blockboard, the solid wood veneer layer is bonded with a finishing layer through the second adhesive layer.

In the above-mentioned environmental protection and moisture-proof blockboard, the facing layer is an Okoume layer.

Compared with the prior art, the beneficial effects of this practical information are reflected in:

In the utility model, the core board is immersed in the urea-formaldehyde resin, and the moisture-proof core board is obtained after fully curing and drying. Urea-formaldehyde resin not only evenly covers the surface of the core board, but also fully adsorbed into the wood fiber gap of the core board. After the urea-formaldehyde resin is cured, the urea-formaldehyde that penetrates into the wood fiber gap can not only improve the moisture resistance of the core board, but also in its pulling Under traction, the urea-formaldehyde resin covering the surface of the core board is not easy to peel off, and is very closely attached to the surface of the core board, which further improves the moisture-proof performance of the core board.

Description of drawings

Fig. 1 is the structural representation of a kind of environmental protection moisture-proof blockboard of the present utility model;

FIG. 2 is a schematic structural diagram of a core board of an environment-friendly and moisture-proof blockboard of the present invention.

Detailed ways

The technical solutions of the present utility model will be described in further detail below with reference to the accompanying drawings and specific embodiments.

Example 1

As shown in FIG. 1 , an environment-friendly and moisture-proof blockboard in the present embodiment includes a core board. Both sides of the core board are bonded to a solid wood veneer layer 3 through a first adhesive layer 2 , and the surface of the solid wood veneer layer 3 is bonded. The facing layer 5 is again adhered by the second adhesive layer 4 .

In this embodiment, the core board is a moisture-proof core board 1. As shown in FIG. 2 and in conjunction with FIG. 1, the preparation method of the moisture-proof core board 1 is as follows: first, coat the side of the planed Chinese fir strips 11 with polyvinyl acetate , and then put it into a metal frame; apply a lateral pressure to the metal frame through bolts, and then send it to a 100t flat press for glue, cold-press forming, and obtain a core board; then place the core board in urea-formaldehyde resin emulsion for 4h dipping , and then hot-pressed at 1.5MPa and 160°C for 600s, using a thickness gauge to control the compression thickness to 12mm, stop the temperature of the press and cool it to below 70°C, and take out the core plate; then use atmospheric pressure steam to heat the core plate, the heat treatment It includes the following stages: ① Raise the heat treatment temperature from room temperature to 100 °C with a heating rate of 20 °C/h; ② Increase the heat treatment temperature from 100 °C to 150 °C with a heating rate of 10 °C/h; ③ At 150 °C Incubate for 1 hour; ④ Raise the heat treatment temperature from 150 ℃ to 190 ℃, and keep it at 190 ℃ for 2 hours; ⑤ Naturally cool to room temperature, take it out; Then according to the requirements of GB/T1931-2009, the fir core board was dried to absolute dryness at 103±2°C to obtain a moisture-proof core board 1.

As shown in FIG. 1 , the surface of the moisture-proof core board 1 is not only covered with a layer of urea-formaldehyde resin 12, but also the urea-formaldehyde resin 12 is fully adsorbed into the wood fiber gaps of the core board and cured. The urea-formaldehyde resin 12 intruding into the wood fiber gap can not only improve the moisture-proof performance of the core board, but also under its pulling and pulling, the urea-formaldehyde resin 12 covering the surface of the core board is not easy to peel off, and is very closely attached to the surface of the core board, which further improves the performance of the core board. Moisture resistance of the core board.

As shown in FIG. 1 , activated carbon is dispersed in the first adhesive layer 2 of this embodiment, and a fumed silica layer 21 is formed on the outer surface of the first adhesive layer 2 . The formation process of the first adhesive layer 2 with the fumed silica layer 21 is as follows: fully wet the activated carbon with water, add it into the adhesive, and add fumed silica at the same time; After curing, the water in the pores of the activated carbon evaporates, forming air channels in the activated carbon adhesive layer, and the flocculent fumed silica is suspended on the surface of the first adhesive layer 2 to form a fumed silica layer 21, which is in the first adhesive layer. The outer surface of the agent layer 2 forms a porous structure, and the porous structure is connected with the pores of the activated carbon through the air channels formed by the evaporation of water, which ensures that the activated carbon can be in contact with the external air in a circular manner, so that the blockboard has excellent formaldehyde adsorption performance.

In order to improve the bonding strength between the moisture-proof core board 1 and the first adhesive layer 2, as shown in FIG. 1 and FIG. 2, the fir wood strips 11 used in this embodiment are formed with a number of grooves 11a. The grooves 11a have a triangular cross section; and, all the grooves 11a are arranged in parallel and uniformly along the length direction of the fir wood strips 11 . After the fir wood strips 11 are spliced into a core board, the grooves 11a on the adjacent fir wood strips 11 may be arranged oppositely or in dislocation (as shown in FIG. 2 ). Compared with the relative arrangement, the dislocation arrangement of the grooves 11a can further improve the bonding strength between the moisture-proof core board 1 and the first adhesive layer 2 .

In this embodiment, the solid wood veneer is a poplar veneer with a thickness of 2.2 mm; the veneer layer 5 is an Okoume layer.

Claims (10)

1. An environmental protection moisture-proof blockboard, comprising a core board, wherein the core board is a moisture-proof core board (1) impregnated with urea-formaldehyde resin. 2. The environmental protection moisture-proof blockboard according to claim 1, characterized in that, the thickness of the moisture-proof core board (1) is 10-13 mm. 3. The environmental protection moisture-proof blockboard as claimed in claim 1, wherein the surface of the moisture-proof core board (1) is bonded with a solid wood veneer layer (3) through the first adhesive layer (2). , activated carbon is dispersed in the first adhesive layer (2). 4. The environment-friendly and moisture-proof blockboard according to claim 3, characterized in that, a fumed silica layer (21) is formed on the outer surface of the first adhesive layer (2). 5. The environmental protection moisture-proof blockboard according to claim 3, characterized in that, the moisture-proof core board (1) has a rough surface. 6. The environmental protection moisture-proof blockboard according to claim 5, characterized in that, a plurality of grooves (11a) arranged in parallel are formed on the surface of the moisture-proof core board (1). 7. The environmental protection moisture-proof blockboard according to claim 6, wherein the moisture-proof core board (1) is formed by splicing a plurality of wooden strips (11), and the grooves (11a) are along the wooden strips. (11) The length direction is evenly arranged. 8. The environment-friendly and moisture-proof blockboard according to claim 7, characterized in that, on the adjacent wooden strips (11), the grooves (11a) are arranged in dislocation. 9. The environmental protection moisture-proof blockboard according to any one of claims 3-8, wherein the solid wood veneer layer (3) is bonded with a veneer through the second adhesive layer (4) layer (5). 10. The environmental protection moisture-proof blockboard according to claim 9, characterized in that, the facing layer (5) is an Okoume layer.

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