CN210791343U - Double-layer veneer high-strength artificial board - Google Patents
Double-layer veneer high-strength artificial board Download PDFInfo
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Abstract
The utility model discloses a double-deck veneer high strength wood-based plate, including the core, be located the last epidermis and the lower epidermis on core two sides respectively, it includes to go up the epidermis: a first upper skin and a second upper skin; the lower epidermis comprises: a first lower epidermis and a second lower epidermis; the first upper surface skin, the second upper surface skin, the first lower surface skin and the second lower surface skin are all made of wood skins with wood grains, the wood grains of the first upper surface skin and the second upper surface skin are arranged in a staggered or equidirectional mode, and the wood grains of the first lower surface skin and the second lower surface skin are arranged in a staggered or equidirectional mode. The artificial board manufactured by the utility model has very high strength and elastic modulus, and can be used as a structural board or even a bearing board; meanwhile, the flame retardant and waterproof paint has good flame retardant property and waterproof property; the formaldehyde content of the used adhesive is lower than 10 percent, the dosage is less, and the adhesive is a low-formaldehyde artificial board. Has good application prospect.
Description
Technical Field
The utility model relates to an artificial board technical field especially relates to a multilayer veneer high strength wood-based plate.
Background
As the name suggests, the artificial board is a board made by adding chemical adhesives to leftover wastes generated in the processing process of wood. The artificial boards are of many kinds, and the common ones are shaving boards, medium density boards, core boards (large core boards), plywood, and fire-proof boards. Because of their respective different characteristics, they are used in different furniture manufacturing fields. The two sides of the artificial board are usually decorated by stickers or wood veneers. The wood skin is produced and processed from natural wood, the paper is processed by physics, the texture of the natural wood skin is natural and irregular and has concave-convex feeling, the texture of the paper is smooth but looks mechanical, the surface is smooth, and some papers imitate the wood holes of the wood and are still rigid; therefore, more and more wood-skin artificial boards are produced in pursuit of the wood texture of the artificial boards.
With the use of artificial boards in various industries such as decoration, furniture, shipbuilding, automobiles and the like, the application range of the artificial boards is continuously widened, but the requirements on the boards are continuously improved, and particularly the requirements on the strength of the artificial boards are higher and higher. Most of the artificial boards in the current market are shaving boards and plywood, the strength of the artificial boards is not high, and a large amount of adhesive is needed for hot-press bonding; although various environment-friendly adhesives are available on the market, such as polyvinyl alcohol adhesives, polyvinyl alcohol adhesives and the like, the adhesives are not suitable for bonding wood materials, and the most effective adhesives which can be used for hot pressing of plates such as shaving boards and the like are only urea-formaldehyde adhesives at present. However, formaldehyde in the urea-formaldehyde glue can be released continuously in the using process of the artificial board, and the health of people is affected. Therefore, artificial boards with high strength, low formaldehyde content in adhesives and flame retardant effect are needed to fill the market vacancy.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to prior art's not enough, provide an intensity height, low formaldehyde and have flame retardant efficiency's wood skin wood-based plate.
The utility model discloses a following technical scheme realizes, the utility model discloses an aspect provides a double-deck veneer high strength wood-based plate, include the core, be located the last epidermis and the lower epidermis on core two sides respectively. The upper skin includes: a first upper skin and a second upper skin; the lower epidermis comprises: a first lower epidermis and a second lower epidermis; the first upper surface skin, the second upper surface skin, the first lower surface skin and the second lower surface skin are all made of wood skins with wood grains, the wood grains of the first upper surface skin and the second upper surface skin are arranged in a staggered or equidirectional mode, and the wood grains of the first lower surface skin and the second lower surface skin are arranged in a staggered or equidirectional mode.
Preferably, the thickness of the artificial plate is 1.2-3.4 cm.
Preferably, the thicknesses of the first upper skin, the second upper skin, the first lower skin and the second lower skin are 1-2 mm.
Preferably, the core plate is prepared by the following steps:
(1) crushing raw materials into strips with the length of 10cm, then crushing the strips into strips with the length of 3-4 cm, and finally crushing the strips into strip fillers with the length of 2.6cm, the width of 0.8cm and the thickness of 0.6 cm;
(2) dipping the strip-shaped filler into low-formaldehyde glue;
(3) and layering the strip-shaped filler soaked with the low-formaldehyde glue, and then hot-pressing to form the core board.
Preferably, the raw materials are any one or more of building garbage, waste wooden doors, decorative materials, old furniture and straws.
Preferably, the pressure of the hot pressing is 1.2-1.4 MPa; the hot pressing temperature is 160-190 ℃; and the hot pressing time is 5-10 min.
Preferably, the low-formaldehyde glue comprises the following raw materials in parts by weight: 10-20 parts of urea, 10-20 parts of formaldehyde, 5-10 parts of melamine resin, 10-20 parts of polyvinyl alcohol, 10-20 parts of sodium carboxymethylcellulose, 1-2 parts of hydrochloric acid, 1-2 parts of sodium hydroxide, 1-4 parts of ammonia water, 5-10 parts of low-gluten flour and 5-10 parts of starch.
Preferably, the core plate is formed by layering at least two layers of strip-shaped fillers, and the specifications of the strip-shaped fillers are as follows: the length is 2.6cm, the width is 0.8cm, and the thickness is 0.6 cm.
Preferably, the core plate is formed by laying two layers of strip-shaped fillers: the first layer of strip-shaped fillers are transversely arranged and layered, and the second layer of strip-shaped fillers are longitudinally arranged and layered.
Preferably, the core plate is formed by layering three layers of strip-shaped fillers: the first layer of strip-shaped fillers are transversely arranged and layered, the second layer of strip-shaped fillers are layered in a herringbone mode, and the third layer of strip-shaped fillers are longitudinally arranged and layered.
Preferably, the core plate is formed by layering four layers of strip-shaped fillers: the first layer of strip-shaped filler is transversely arranged and layered, the second layer of strip-shaped filler is longitudinally arranged and layered, the third layer of strip-shaped filler is transversely arranged and layered, and the fourth layer of strip-shaped filler is longitudinally arranged and layered.
Preferably, the core plate is formed by layering five layers of strip-shaped fillers: the first layer of strip-shaped filler is transversely arranged and layered, the second layer of strip-shaped filler is arranged in a herringbone manner and layered, the third layer of strip-shaped filler is longitudinally arranged and layered, the fourth layer of strip-shaped filler is arranged in a herringbone manner and layered, and the fifth layer of strip-shaped filler is transversely arranged and layered.
The second aspect of the present invention provides a method for manufacturing a high-strength artificial board with a double-layer veneer, comprising the steps of:
s01, immersing the second upper surface skin and the second lower surface skin into the flame-retardant low-formaldehyde adhesive, so that the two surfaces of the second upper surface skin and the second lower surface skin are both immersed with the flame-retardant low-formaldehyde adhesive;
s02, sequentially attaching the first upper surface skin, the second upper surface skin soaked with the flame-retardant low-formaldehyde adhesive, the core plate, the second lower surface skin soaked with the flame-retardant low-formaldehyde adhesive and the second lower surface skin together, and prepressing;
and S03, carrying out hot pressing on the pre-pressed board, and cooling and shaping to obtain the double-layer veneer high-strength artificial board.
Preferably, the flame-retardant low-formaldehyde adhesive comprises the following raw materials in parts by weight: 40-50 parts of low-formaldehyde glue, 5-10 parts of low-gluten flour, 5-8 parts of corn starch, 10-15 parts of environment-friendly waterproof glue, 5-10 parts of formaldehyde-eliminating powder and 15-25 parts of organic phosphorus flame retardant;
the low-formaldehyde glue comprises the following raw materials in parts by weight: 10-20 parts of urea, 10-20 parts of formaldehyde, 5-10 parts of melamine resin, 10-20 parts of polyvinyl alcohol, 10-20 parts of sodium carboxymethylcellulose, 1-2 parts of hydrochloric acid, 1-2 parts of sodium hydroxide, 1-4 parts of ammonia water, 5-10 parts of low-gluten flour and 5-10 parts of starch.
Preferably, the glue coating amount of the second upper skin and the second lower skin is 3m2The veneer was coated with 2Kg of a flame retardant low formaldehyde adhesive.
Preferably, the pressure of the pre-pressing is 250-500 kN/m2(ii) a The hot pressing pressure is 350-370 tons, the hot pressing temperature is 100-110 ℃, and the hot pressing time is 20-30 min.
The utility model has the advantages that:
1. the utility model discloses a double-deck veneer high strength wood-based plate adopts the veneer that intensity is high to strengthen the intensity of wood-based plate, and the core adopts the strip filler that the length and width height is 2.6X 0.8X 0.6cm to replace the shaving piece, has improved the intensity of core greatly.
2. The utility model discloses a double-deck veneer high strength wood-based plate, core use raw materials such as building rubbish, decoration abandonment material, straw to make, and raw and other materials do not need kibbling very tiny, both the cost is reduced has improved production efficiency and has simplified production processes again.
3. The double-layer wood-skin high-strength artificial board uses low-formaldehyde glue when manufacturing the core board, and reduces the adding amount of urea-formaldehyde by adding polyvinyl alcohol and sodium carboxymethylcellulose; when the wood veneer is bonded, the flame-retardant low-formaldehyde adhesive is used, and the content of formaldehyde in the artificial board is reduced by adding substances such as low-gluten flour, starch and the like.
4. The utility model discloses a double-deck wood skin high strength wood-based plate uses fire-retardant low aldehyde adhesive when bonding the wood skin, adds the organic phosphorus flame retardant in the gluing agent, uses between two-layer wood skin, and the flame retardant produces phosphoric acid layer formation non-volatility protective layer in the burning and covers in the combustion face, has completely cut off the supply of oxygen, makes the burning stop again because of gathering metaphosphoric acid can promote the high polymer burning to decompose and go on to the carbonization, generates a large amount of moisture to the burning has been prevented. The flame retardant can effectively prevent the wood veneer from burning, thereby protecting the core board.
5. The utility model discloses a grain staggered arrangement of the double-deck veneer of double-deck veneer high strength wood-based plate two sides makes the grain interlock of cuticle from top to bottom, not only beautifully but also increased the intensity of wood-based plate.
6. The utility model discloses a double-deck wood skin high strength wood-based plate has abandoned the preparation technology of traditional shaving board in the preparation of core, replaces shaving piece with 2.6X 0.8X 0.6 cm's strip filler, the quantity of the gluing agent that has significantly reduced, has also reduced the release amount of formaldehyde.
Drawings
FIG. 1 is a schematic structural view of a double-layer wood-skin high-strength artificial board of the present invention;
in FIG. 2, A is a schematic view of a transverse arrangement and layering structure of a strip-shaped filler;
in FIG. 2, B is a schematic view of a longitudinally arranged layer structure of the strip-shaped filler;
in FIG. 2, C is a schematic view of a structure of a layer of the strip-shaped filler arranged in a herringbone pattern;
FIG. 3 is a process flow chart of the double-layer wood-skin high-strength artificial board of the present invention;
shown in the figure:
1. core board, 2, first upper surface skin, 3, first lower surface skin, 4, second upper surface skin, 5, second lower surface skin.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
As described in the background art, the artificial board made of the wood veneer attached to the particle board in the current market needs a board with high strength, low formaldehyde content in the adhesive and flame retardant effect to fill the market vacancy. Based on this, the utility model provides a double-deck veneer high strength wood-based plate, including the core, be located the last epidermis and the lower epidermis on core two sides respectively, it includes to go up the epidermis: a first upper skin and a second upper skin; the lower epidermis comprises: a first lower epidermis and a second lower epidermis; the first upper surface skin, the second upper surface skin, the first lower surface skin and the second lower surface skin are all made of wood skins with wood grains, the wood grains of the first upper surface skin and the second upper surface skin are arranged in a staggered or equidirectional mode, and the wood grains of the first lower surface skin and the second lower surface skin are arranged in a staggered or equidirectional mode.
In order to structurally improve the strength of the artificial board, the core board adopts strip-shaped fillers with the specification of 2.6 multiplied by 0.8 multiplied by 0.6cm to replace shaving pieces, and compared with a common shaving board, the core board after layering and hot pressing has greatly improved strength. The core plate is formed by layering at least two layers of strip-shaped fillers.
As an embodiment of the present invention, the core plate is formed by laying layers of two layers of strip-shaped filler, wherein: the first layer of strip-shaped fillers are transversely arranged and layered, and the second layer of strip-shaped fillers are longitudinally arranged and layered.
As another embodiment of the present invention, the core plate is formed by laying three layers of strip-shaped filler: the first layer of strip-shaped fillers are transversely arranged and layered, the second layer of strip-shaped fillers are layered in a herringbone mode, and the third layer of strip-shaped fillers are longitudinally arranged and layered.
As another embodiment of the present invention, the core plate is formed by laying four layers of strip-shaped fillers: the first layer of strip-shaped filler is transversely arranged and layered, the second layer of strip-shaped filler is longitudinally arranged and layered, the third layer of strip-shaped filler is transversely arranged and layered, and the fourth layer of strip-shaped filler is longitudinally arranged and layered.
As another embodiment of the present invention, the core plate is formed by laying five layers of strip-shaped fillers: the first layer of strip-shaped filler is transversely arranged and layered, the second layer of strip-shaped filler is arranged in a herringbone manner and layered, the third layer of strip-shaped filler is longitudinally arranged and layered, the fourth layer of strip-shaped filler is arranged in a herringbone manner and layered, and the fifth layer of strip-shaped filler is transversely arranged and layered.
The different laying direction of each layer of the strip-shaped filler can increase the strength of the core board.
The veneer jointed with the core board adopts soft log veneer, and compared with the log veneer, the veneer is more elastic and tough and is easier to be jointed with the core board. The surface of the log board is smooth, the surface of the log skin is provided with grains, when the log board is attached to the core board, the friction force generated by the log skin and the core board is larger, and the wood grains can be attached to the core board more tightly in staggered arrangement and occlusion; the thickness of each layer of veneer is 1-2 mm, and the strength of the artificial board is further increased.
The low-formaldehyde glue comprises the following raw materials in parts by weight: 10-20 parts of urea, 10-20 parts of formaldehyde, 5-10 parts of melamine resin, 10-20 parts of polyvinyl alcohol, 10-20 parts of sodium carboxymethylcellulose, 1-2 parts of hydrochloric acid, 1-2 parts of sodium hydroxide, 1-4 parts of ammonia water, 5-10 parts of low-gluten flour and 5-10 parts of starch.
The strip-shaped filler in the core plate is low-formaldehyde glue, polyvinyl alcohol and sodium carboxymethyl cellulose are added on the basis of urea-formaldehyde glue, the two substances can be polymerized into a film, the adhesive property of the urea-formaldehyde glue is increased and the curing agent is acted when the two substances are used together with flour and starch, and the content of urea-formaldehyde is greatly reduced; the formaldehyde content is reduced from 40% to 20%. Meanwhile, compared with the shaving board, the content of the adhesive used for manufacturing the core board is greatly reduced. The shaving board needs a large amount of adhesive to bond shaving pieces or particles together, and the core board of the invention uses strip-shaped fillers with certain sizes, so that the adhesive consumption is greatly reduced, and the content of formaldehyde released by the adhesive is greatly reduced compared with the shaving board with the same size.
The flame-retardant low-formaldehyde adhesive comprises the following raw materials in parts by weight: 40-50 parts of low-formaldehyde glue, 5-10 parts of low-gluten flour, 5-8 parts of corn starch, 10-15 parts of environment-friendly waterproof glue, 5-10 parts of formaldehyde eliminating powder and 15-25 parts of organic phosphorus flame retardant.
The low-formaldehyde glue comprises the following raw materials in parts by weight: 10-20 parts of urea, 10-20 parts of formaldehyde, 5-10 parts of melamine resin, 10-20 parts of polyvinyl alcohol, 10-20 parts of sodium carboxymethylcellulose, 1-2 parts of hydrochloric acid, 1-2 parts of sodium hydroxide, 1-4 parts of ammonia water, 5-10 parts of low-gluten flour and 5-10 parts of starch.
The environment-friendly waterproof glue and the formaldehyde-eliminating powder are commercially available products and can be purchased from chatting brilliant environment-friendly science and technology development limited company.
The two surfaces of the core plate are adhered with the veneers by using the flame-retardant low-formaldehyde adhesive, and the core plate is prepared by adding low-gluten flour, corn starch, environment-friendly glue prevention, formaldehyde elimination powder and an organic phosphorus flame retardant on the basis of the low-formaldehyde adhesive. The formula is obtained through long-term repeated tests, the low-gluten flour and the corn starch can increase the cohesiveness of the low-formaldehyde glue, and simultaneously prevent the urea-formaldehyde glue from being large in shrinkage after being cured and preventing the adhesive layer from generating internal stress to reduce the cohesiveness. The addition of the environment-friendly waterproof glue can not only enable the artificial board to achieve the waterproof purpose, but also control the release of formaldehyde in the artificial board and ensure the health of a user. The formaldehyde eliminating powder can reduce the release of formaldehyde in the urea-formaldehyde resin adhesive and improve the stability of the urea-formaldehyde resin. The organic phosphorus fire retardant DMMP is an additive fire retardant, when wood veneer bonded by the fire retardant catches fire, DMMP decomposes to generate a phosphoric acid layer to form a nonvolatile protective layer to cover the wood veneer, thereby isolating the supply of oxygen, promoting the combustion to stop and preventing the combustion because the polymetaphosphoric acid can promote the combustion decomposition of high polymer to carbonization to produce a large amount of water. When the fire occurs, the combustion of the artificial board is started from two sides, when the first layer of wood skin is combusted to the second layer of wood skin, the flame-retardant low-formaldehyde adhesive between the two layers of wood skins prevents the combustion from continuing, and the core board is protected from being ignited. Therefore, the two layers of the flame-retardant low-formaldehyde adhesives on the surface of the second layer of the veneer can effectively protect the artificial board when catching fire, and have good flame-retardant effect. The addition of the low-gluten flour, the corn starch, the waterproof formaldehyde removing agent and the organic phosphorus flame retardant reduces the formaldehyde content from about 20 percent to below 10 percent.
In order to clearly illustrate the technical features of the present solution, the present solution is explained below by way of specific embodiments.
Example 1:
1. the wood veneer is poplar wood veneer, the thicknesses of the first upper veneer, the second upper veneer, the first lower veneer and the second lower veneer are all 1mm, the wood grains of the first upper veneer and the second upper veneer are vertically staggered, and the wood grains of the first lower veneer and the second lower veneer are vertically staggered;
2. manufacturing the core plate:
(1) crushing old furniture into strips with the length of 10cm, then crushing the old furniture into strips with the length of 4cm, and finally crushing the old furniture into strip fillers with the length of 2.6cm, the width of 0.8cm and the thickness of 0.6 cm;
(2) dipping the strip-shaped filler into low-formaldehyde glue;
(3) laying the strip-shaped filler dipped with the low-formaldehyde glue into three layers: the first layer is transversely arranged, the second layer is shaped like a Chinese character 'ren', and the third layer is longitudinally arranged; then hot pressing is carried out, the pressure is 1.2MPa, the hot pressing temperature is 190 ℃, and the hot pressing time is 5 min; and cooling to obtain the core plate.
3. The low-formaldehyde glue comprises the following raw materials in parts by weight: 10 parts of urea, 10 parts of formaldehyde, 5 parts of melamine resin, 10 parts of polyvinyl alcohol, 10 parts of sodium carboxymethylcellulose, 1 part of hydrochloric acid, 1 part of sodium hydroxide, 1 part of ammonia water, 5 parts of low-gluten flour and 5 parts of starch.
The flame-retardant low-formaldehyde adhesive comprises the following raw materials in parts by weight: 50 parts of low-formaldehyde glue, 10 parts of low-gluten flour, 8 parts of corn starch, 15 parts of environment-friendly waterproof glue, 10 parts of formaldehyde eliminating powder and 25 parts of organic phosphorus flame retardant.
4. Manufacturing the artificial board:
s01, immersing the second upper surface skin and the second lower surface skin into the flame-retardant low-formaldehyde adhesive, so that the two surfaces of the second upper surface skin and the second lower surface skin are both immersed with the flame-retardant low-formaldehyde adhesive;
s02, sequentially attaching the first upper surface skin, the second upper surface skin soaked with the flame-retardant low-formaldehyde adhesive, the core plate, the second lower surface skin soaked with the flame-retardant low-formaldehyde adhesive and the second lower surface skin together, and prepressing at a pressure of 250kN/m2；
S03, carrying out hot pressing on the pre-pressed plate, wherein the pressure is 350 tons, the temperature is 110 ℃, and the time is 20 min; cooling and shaping to obtain the double-layer veneer high-strength artificial board.
The thickness of the artificial board is as follows: 2.2 cm.
Example 2
1. The wood veneer is poplar wood veneer, the thickness of the first upper veneer and the first lower veneer is 1mm, the thickness of the second upper veneer and the thickness of the second lower veneer are both 2mm, the wood grains of the first upper veneer and the second upper veneer are arranged in the same direction, and the wood grains of the first lower veneer and the second lower veneer are arranged in the same direction;
2. manufacturing the core plate:
(1) firstly crushing the construction waste into strips with the length of 10cm, then crushing the strips into strips with the length of 4cm, and finally crushing the strips into strip fillers with the length of 2.6cm, the width of 0.8cm and the thickness of 0.6 cm;
(2) dipping the strip-shaped filler into low-formaldehyde glue;
(3) laying the strip-shaped filler dipped with the low-formaldehyde glue into three layers: the first layer is transversely arranged, the second layer is shaped like a Chinese character 'ren', and the third layer is longitudinally arranged; then hot pressing is carried out, the pressure is 1.3MPa, the hot pressing temperature is 175 ℃, and the hot pressing time is 8 min; and cooling to obtain the core plate.
3. The low-formaldehyde glue comprises the following raw materials in parts by weight: 15 parts of urea, 15 parts of formaldehyde, 8 parts of melamine resin, 15 parts of polyvinyl alcohol, 15 parts of sodium carboxymethylcellulose, 1 part of hydrochloric acid, 2 parts of sodium hydroxide, 2 parts of ammonia water, 8 parts of low-gluten flour and 8 parts of starch.
The flame-retardant low-formaldehyde adhesive comprises the following raw materials in parts by weight: 45 parts of low-formaldehyde glue, 8 parts of low-gluten flour, 6 parts of corn starch, 13 parts of environment-friendly waterproof glue, 8 parts of formaldehyde eliminating powder and 20 parts of organic phosphorus flame retardant.
4. Manufacturing the artificial board:
s01, immersing the second upper surface skin and the second lower surface skin into the flame-retardant low-formaldehyde adhesive, so that the two surfaces of the second upper surface skin and the second lower surface skin are both immersed with the flame-retardant low-formaldehyde adhesive;
s02, sequentially attaching the first upper surface skin, the second upper surface skin soaked with the flame-retardant low-formaldehyde adhesive, the core plate, the second lower surface skin soaked with the flame-retardant low-formaldehyde adhesive and the second lower surface skin together, and prepressing at a pressure of 350kN/m2；
S03, carrying out hot pressing on the pre-pressed plate, wherein the pressure is 360 tons, the temperature is 105 ℃, and the time is 25 min; cooling and shaping to obtain the double-layer veneer high-strength artificial board.
The thickness of the artificial board is as follows: 2.4 cm.
Example 3
1. The wood veneer is poplar wood veneer, the thicknesses of the first upper veneer, the second upper veneer, the first lower veneer and the second lower veneer are all 2mm, the wood grains of the first upper veneer and the second upper veneer are vertically staggered, and the wood grains of the first lower veneer and the second lower veneer are vertically staggered;
2. manufacturing the core plate:
(1) firstly crushing the waste wood door into strips with the length of 10cm, then crushing the strips into strips with the length of 4cm, and finally crushing the strips into strip fillers with the length of 2.6cm, the width of 0.8cm and the thickness of 0.6 cm;
(2) dipping the strip-shaped filler into low-formaldehyde glue;
(3) laying the strip-shaped filler dipped with the low-formaldehyde glue into three layers: the first layer is transversely arranged, the second layer is shaped like a Chinese character 'ren', and the third layer is longitudinally arranged; then hot pressing is carried out, the pressure is 1.4MPa, the hot pressing temperature is 160 ℃, and the hot pressing time is 10 min; and cooling to obtain the core plate.
3. The low-formaldehyde glue comprises the following raw materials in parts by weight: 20 parts of urea, 20 parts of formaldehyde, 10 parts of melamine resin, 20 parts of polyvinyl alcohol, 20 parts of sodium carboxymethylcellulose, 2 parts of hydrochloric acid, 2 parts of sodium hydroxide, 4 parts of ammonia water, 10 parts of low-gluten flour and 10 parts of starch.
The flame-retardant low-formaldehyde adhesive comprises the following raw materials in parts by weight: 40 parts of low-formaldehyde glue, 5 parts of low-gluten flour, 5 parts of corn starch, 10 parts of environment-friendly waterproof glue, 5 parts of formaldehyde eliminating powder and 15 parts of organic phosphorus flame retardant.
4. Manufacturing the artificial board:
s01, immersing the second upper surface skin and the second lower surface skin into the flame-retardant low-formaldehyde adhesive, so that the two surfaces of the second upper surface skin and the second lower surface skin are both immersed with the flame-retardant low-formaldehyde adhesive;
s02, sequentially attaching the first upper surface skin, the second upper surface skin soaked with the flame-retardant low-formaldehyde adhesive, the core plate, the second lower surface skin soaked with the flame-retardant low-formaldehyde adhesive and the second lower surface skin together, and prepressing at a pressure of 500kN/m2；
S03, carrying out hot pressing on the pre-pressed plate, wherein the pressure is 370 tons, the temperature is 100 ℃, and the time is 20 min; cooling and shaping to obtain the double-layer veneer high-strength artificial board.
The thickness of the artificial board is as follows: 2.6 cm.
Comparative example 1
1. The wood veneer is poplar wood veneer, the thicknesses of the first upper veneer, the second upper veneer, the first lower veneer and the second lower veneer are all 1mm, and the wood grains are arranged in a staggered mode;
2. core board: adopting a common shaving board with the thickness of 1.8 cm;
3. adhesive: commercially available urea-formaldehyde glue;
4. manufacturing the artificial board:
the same as in example 1.
Artificial board thickness: 2.2 cm.
Comparative example 2
1. The wood veneer is poplar wood veneer, the thickness of the first upper surface skin and the first lower surface skin is 1mm, and the thickness of the second upper surface skin and the thickness of the second lower surface skin are both 2 mm;
2. core board: adopting a common shaving board with the thickness of 1.8 cm;
3. adhesive: commercially available urea-formaldehyde glue;
4. manufacturing the artificial board:
the same as in example 2.
Artificial board thickness: 2.4 cm.
Comparative example 3
1. The wood veneer is poplar wood veneer, and the thicknesses of the first upper surface skin, the second upper surface skin, the first lower surface skin and the second lower surface skin are all 2 mm;
2. core board: adopting a common shaving board with the thickness of 1.8 cm;
3. adhesive: commercially available urea-formaldehyde glue;
4. manufacturing the artificial board:
the same as in example 3.
Artificial board thickness: 2.6 cm.
Test example 1: static bending strength test
The static bending strength (three points) and the elastic modulus of the artificial board samples prepared in the examples 1-3 and the comparative examples 1-3 are tested by using an universal electronic tensile testing machine according to GB/T17657 plus 2013 physicochemical property test method for artificial boards and veneers, and the obtained results are shown in Table 1.
TABLE 1 static bending Strength and elastic modulus test results
| Item | Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| Static bending strength MPa | 31.4 | 30.6 | 30.2 | 20.0 | 19.1 | 18.8 |
| Modulus of elasticity MPa | 3287 | 3215 | 3116 | 2701 | 2658 | 2581 |
As can be seen from Table 1, the flexural strength and the elastic modulus of the artificial boards prepared in the examples 1 to 3 are much higher than those of the artificial boards prepared in the comparative examples 1 to 3, and the artificial boards prepared in the examples have very high flexural strength and elastic modulus and can be used as structural boards and even bearing boards.
Test example 2: test for flame retardancy
The artificial boards manufactured in examples 1 to 3 and comparative examples 1 to 3 were subjected to an oxygen index test using an oxygen index meter, and the results are shown in table 2.
Table 2 oxygen index test results
| Item | Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| Oxygen index% | 36.2 | 35.4 | 35.1 | 26.3 | 26.0 | 25.4 |
As can be seen from Table 2, the oxygen index of the artificial board prepared in the embodiment 1-3 is far greater than that of the comparative example 1-3, the maximum value reaches 36.2, and the artificial board completely meets the flame-retardant requirement, and the utility model discloses a flame retardant effect of the double-layer veneer high-strength artificial board is obvious.
Test example 3: test for Formaldehyde Release amount
The artificial board samples manufactured in examples 1-3 and comparative examples 1-3 are put into a dryer at a certain temperature according to GB/T17657 plus 2013 physicochemical property test method for artificial boards and veneers, the formaldehyde released by the test pieces is absorbed by a certain volume of water, and the formaldehyde content in the water within 24h is measured. The results are shown in Table 3.
TABLE 3 Formaldehyde emission
As can be seen from table 3, the formaldehyde emission of the artificial boards prepared in examples 1 to 3 is much lower than that of comparative examples 1 to 3, the formaldehyde emission of example 1 is the lowest, which is related to the addition amount of formaldehyde eliminating powder in the flame-retardant low-formaldehyde adhesive used in example 1, and the environment-friendly waterproof adhesive used in the flame-retardant low-formaldehyde adhesive also has the function of controlling formaldehyde emission. The artificial board of the invention is a more environment-friendly low-formaldehyde artificial board.
Test example 4: water absorption swelling test
The water absorption thickness expansion rate of the artificial board samples prepared in examples 1-3 and comparative examples 1-3 is tested by using a water tank and a micrometer according to GB/T17657 and 2013 physicochemical property test method for artificial boards and veneers, and the obtained results are shown in Table 4.
TABLE 4 Water swelling Rate
As can be seen from Table 4, the water absorption of the artificial boards prepared in examples 1 to 3 is lower than that of comparative examples 1 to 3, and the artificial boards are related to the environmental-friendly waterproof adhesive added to the flame-retardant low-formaldehyde adhesive used in the examples, so that the waterproof performance of the products is good.
Test example 5: bond Strength test
The bonding strength and the surface bonding strength of the artificial boards prepared in examples 1-3 and comparative examples 1-3 were tested by using a universal tensile testing machine according to GB/T17657 plus 2013 physicochemical property test method for artificial boards and veneered artificial boards, and the obtained results are shown in Table 5.
TABLE 5 bonding Strength test results
Can know by table 5, embodiment 1 ~ 3 plywood's that makes bonding strength and surface bonding strength all are slightly higher than comparative example 1 ~ 3, show the utility model discloses a fire-retardant low aldehyde adhesive has fine adhesion property, and formaldehyde content is low, is the low aldehyde adhesive of ideal.
Of course, the above description is not limited to the above examples, and technical features of the present invention that are not described in the present application may be implemented by or using the prior art, and are not described herein again; the above embodiments and drawings are only used for illustrating the technical solutions of the present invention and are not intended to limit the present invention, and the present invention has been described in detail with reference to the preferred embodiments, and those skilled in the art should understand that changes, modifications, additions or substitutions made by those skilled in the art within the spirit of the present invention should also belong to the protection scope of the claims of the present invention.
Claims (8)
1. Double-deck veneer high strength wood-based plate includes the core, is located the last epidermis and the lower epidermis on core two sides respectively, its characterized in that, it includes to go up the epidermis: a first upper skin and a second upper skin; the lower epidermis comprises: a first lower epidermis and a second lower epidermis; the first upper surface skin, the second upper surface skin, the first lower surface skin and the second lower surface skin are all made of wood skins with wood grains, the wood grains of the first upper surface skin and the second upper surface skin are arranged in a staggered or equidirectional mode, and the wood grains of the first lower surface skin and the second lower surface skin are arranged in a staggered or equidirectional mode.
2. The artificial board according to claim 1, wherein the thickness of the artificial board is 1.2-3.4 cm.
3. The artificial board according to claim 1, wherein the first upper skin, the second upper skin, the first lower skin and the second lower skin have a thickness of 1-2 mm.
4. The artificial board according to claim 1, wherein the core board is formed by layering at least two layers of strip-shaped fillers, and the specifications of the strip-shaped fillers are as follows: the length is 2.6cm, the width is 0.8cm, and the thickness is 0.6 cm.
5. An artificial board according to claim 4, wherein the core is formed by laying up two layers of strip-like filler: the first layer of strip-shaped fillers are transversely arranged and layered, and the second layer of strip-shaped fillers are longitudinally arranged and layered.
6. An artificial board according to claim 4, wherein the core is formed by layering three layers of strip-like filler: the first layer of strip-shaped fillers are transversely arranged and layered, the second layer of strip-shaped fillers are layered in a herringbone mode, and the third layer of strip-shaped fillers are longitudinally arranged and layered.
7. An artificial board according to claim 4, wherein the core is formed by laying up four layers of strip-like filler: the first layer of strip-shaped filler is transversely arranged and layered, the second layer of strip-shaped filler is longitudinally arranged and layered, the third layer of strip-shaped filler is transversely arranged and layered, and the fourth layer of strip-shaped filler is longitudinally arranged and layered.
8. An artificial board according to claim 4, wherein the core board is formed by layering five layers of strip-like fillers: the first layer of strip-shaped filler is transversely arranged and layered, the second layer of strip-shaped filler is arranged in a herringbone manner and layered, the third layer of strip-shaped filler is longitudinally arranged and layered, the fourth layer of strip-shaped filler is arranged in a herringbone manner and layered, and the fifth layer of strip-shaped filler is transversely arranged and layered.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110405868A (en) * | 2019-08-15 | 2019-11-05 | 泰安市森鑫工贸有限公司 | The double-deck wood skin high-strength artificial plate and its manufacturing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110405868A (en) * | 2019-08-15 | 2019-11-05 | 泰安市森鑫工贸有限公司 | The double-deck wood skin high-strength artificial plate and its manufacturing method |
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