Formaldehyde-free flame-retardant plywood produced by using soybean protein glue and preparation method thereof

Abstract

A formaldehyde-free flame-retardant plywood produced by using soybean protein glue and a preparation method thereof belong to the technical field of artificial boards. A first layer of transverse veneer is connected to one side of a first layer of longitudinal veneer, the other side of the first layer of longitudinal veneer is connected to a glue layer, the other side of the glue layer is connected to a second layer of longitudinal veneer, and the other side of the second layer of longitudinal veneer is connected to a second layer of transverse veneer. The process includes impregnating veneer with a flame retardant, mixing flame retardant with soybean protein glue, gluing, pre-pressing, hot pressing, sanding, veneer, polishing and other processes. In order to ensure the flame retardancy of the wood board, the veneer and the adhesive are both combined with a flame retardant, the veneer is impregnated with a water-soluble non-halogen flame retardant, and the adhesive is mixed with an insoluble powder flame retardant, which effectively ensures the flame retardancy and water resistance of the plywood. The advantage is that the flame retardancy of the board itself is retained, and the formaldehyde hazard of the formaldehyde-containing adhesive when the traditional flame retardant board is subjected to high temperature is solved. At the same time, the excellent water resistance of soybean protein glue also ensures the water and moisture resistance of the board.

Description

Technical Field

[0001] The invention relates to a formaldehyde-free flame-retardant plywood produced by utilizing soybean protein glue and a preparation method thereof, belonging to the technical field of artificial boards. Background Art

[0002] The demand for flame-retardant boards in the building decoration industry is increasing. Among them, artificial wood boards, especially flame-retardant boards mainly based on plywood, account for an increasing proportion in engineering decoration. Although traditional "trialdehyde" glue flame-retardant plywood has basically met the requirements of the building decoration industry for fire resistance, under the condition of high-temperature radiation or direct burning of other burning materials, the "trialdehyde" glue inside the board will decompose and release a large amount of toxic and harmful formaldehyde gas, which will also cause great harm to the human body. Therefore, plywood that is both formaldehyde-free and flame-retardant will become the focus and difficulty of research in the artificial board industry. Summary of the invention

[0003] In order to overcome the deficiencies of the prior art, the present invention provides a formaldehyde-free flame-retardant plywood produced by using soybean protein glue and a preparation method thereof.

[0004] A formaldehyde-free flame-retardant plywood produced by using soybean protein glue, wherein a first transverse veneer is connected to one side of a first longitudinal veneer, the other side of the first longitudinal veneer is connected to a glue layer, the other side of the glue layer is connected to a second longitudinal veneer, and the other side of the second longitudinal veneer is connected to a second transverse veneer.

[0005] The first layer of transverse veneer is connected to one side of the first layer of longitudinal veneer by bonding, and the other side of the second layer of longitudinal veneer is connected to the second layer of transverse veneer by bonding.

[0006] The invention discloses a formaldehyde-free flame-retardant plywood produced by using soybean protein glue. The transverse veneer and the longitudinal veneer are connected to form a composite board, and the composite board is connected to another composite board through a glue layer to form a multi-layer composite board.

[0007] Multilayer composite panels contain more than two layers of composite panels.

[0008] A method for preparing formaldehyde-free flame-retardant plywood produced by using soybean protein glue comprises the following steps:

[0009] Step 1, soaking the veneer in water containing 30-80% water-soluble flame retardant for about 72 hours, and drying after soaking;

[0010] Step 2, mixing the water-insoluble flame retardant with the soybean protein glue for standby use;

[0011] Step 3: Apply the soy protein glue prepared in step 2 to the dried veneer, and then perform paving, pre-pressing, hot pressing, sanding, veneering and polishing to obtain the soy protein glue formaldehyde-free flame-retardant plywood.

[0012] The flame retardant impregnates the veneer, and both the veneer and the adhesive are bonded with the flame retardant.

[0013] The flame retardant used for impregnating the veneer is a water-based non-halogen flame retardant, including one or more combinations of monoguanidine phosphate, diguanidine phosphate, ammonium polyphosphate with a polymerization degree lower than 20, silane coupling agent, soluble borate, potassium molybdate, and water-soluble melamine nitrogen-phosphorus complex.

[0014] The flame retardant mixed with the adhesive is an insoluble flame retardant, including one or more combinations of zinc borate, zinc metaborate, zinc fluoroborate, ammonium polyphosphate with a polymerization degree greater than 100, and antimony oxide.

[0015] The adhesive contains Bayer D03 adhesive, which contains 20% soybean defatted protein and 15% soybean protein isolate, and uses urea and sodium hydroxide as main modifiers. It is ground into powder by two stages of colloid mill and homogenizer in the state of aqueous solution.

[0016] The advantages of the present invention are: it overcomes the flammability of common plywood, and the fire retardant grade can reach A2 level. It does not contain formaldehyde and other harmful substances, and overcomes the inherent deficiency of urea-formaldehyde resin glue; it does not release free formaldehyde, far exceeding the European E0 grade (0.5 mg / L) and Japanese F☆☆☆☆ (0.3 mg / L), and all process indicators are better than existing glues, with high cost performance; the board has high bonding strength, and the average bonding strength is greater than 1.05Mpa; it has excellent water resistance, and the glue does not delaminate after boiling for more than 8 hours. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] When considered in conjunction with the accompanying drawings, the present invention can be more completely and better understood and many of the accompanying advantages can be easily known by referring to the detailed description below, but the drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention, as shown in the figure:

[0018] Figure 1 It is a structural schematic diagram of the present invention.

[0019] The present invention is further described below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0020] Obviously, many modifications and changes made by those skilled in the art based on the purpose of the present invention belong to the protection scope of the present invention.

[0021] It will be understood by those skilled in the art that, unless expressly stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when an element or component is said to be "connected" to another element or component, it may be directly connected to the other element or component, or there may be an intermediate element or component. The term "and / or" used herein includes any unit and all combinations of one or more associated listed items.

[0022] Those skilled in the art will understand that unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as generally understood by those skilled in the art.

[0023] To facilitate the understanding of the embodiments, further explanations will be given below, and each embodiment does not constitute a limitation of the present invention.

[0024] Embodiment 1: A formaldehyde-free flame-retardant plywood produced by using soy protein glue, the plywood includes processes such as impregnating veneer with flame retardant, mixing flame retardant with soy protein glue, gluing, pre-pressing, hot pressing, sanding, veneering, polishing, etc., wherein in order to ensure the flame retardancy of the wood board, the veneer and the adhesive are both combined with the flame retardant, the veneer is impregnated with a water-soluble non-halogen flame retardant, and the adhesive is mixed with an insoluble powder flame retardant. Such a combination can more effectively ensure the flame retardancy and water resistance of the plywood.

[0025] The flame retardant used for impregnating the veneer is a water-based non-halogen flame retardant, including one or more combinations of monoguanidine phosphate, diguanidine phosphate, ammonium polyphosphate with a polymerization degree lower than 20, silane coupling agent, soluble borate, potassium molybdate, water-soluble melamine nitrogen-phosphorus complex, etc.

[0026] The flame retardant mixed with the adhesive is an insoluble flame retardant, including one or more combinations of zinc borate, zinc metaborate, zinc fluoroborate, ammonium polyphosphate with a polymerization degree greater than 100, antimony oxide, etc.

[0027] Soy protein glue uses Bayer D03 adhesive, which contains 20% soy defatted protein and 15% soy protein isolate, with urea and sodium hydroxide as the main modifiers. It is made by two-stage homogenization grinding in a colloid mill and a homogenizer in the state of aqueous solution.

[0028] A formaldehyde-free flame-retardant plywood produced by using soybean protein glue comprises the following steps:

[0029] (1) The veneer is immersed in water containing a certain amount of water-soluble flame retardant for about 72 hours, and then dried after the immersion is completed;

[0030] (2) Mixing the water-insoluble flame retardant with the soybean protein glue for later use;

[0031] (3) The dried veneer is coated with the soybean protein glue described in step (2), and subjected to processes such as paving, pre-pressing, hot pressing, sanding, veneering, and polishing to obtain a soybean protein glue formaldehyde-free flame-retardant plywood.

[0032] Example 2: Figure 1 As shown, a formaldehyde-free flame retardant plywood produced by using soy protein glue, a first layer of transverse veneer 1 is connected to one side of a first layer of longitudinal veneer 2, the other side of the first layer of longitudinal veneer 2 is connected to a first adhesive layer 3, the other side of the first adhesive layer 3 is connected to a second layer of longitudinal veneer 4, the other side of the second layer of longitudinal veneer 4 is connected to a second layer of transverse veneer 5, the other side of the second layer of transverse veneer 5 is connected to a third layer of longitudinal veneer 6, the other side of the third layer of longitudinal veneer 6 is connected to a second adhesive layer 7, the other side of the second adhesive layer 7 is connected to a third layer of longitudinal veneer 9, and the other side of the third layer of longitudinal veneer 9 is connected to a third layer of transverse veneer 8.

[0033] The transverse veneer is connected with the longitudinal veneer to form a composite board, and the composite board is connected with another composite board through a glue layer to form a multi-layer composite board.

[0034] Multilayer composite panels contain more than two layers of composite panels.

[0035] The transverse veneer and the longitudinal veneer are immersed in a flame retardant, which is a water-based non-halogen flame retardant, including one or more combinations of monoguanidine phosphate, diguanidine phosphate, ammonium polyphosphate with a polymerization degree of less than 20, silane coupling agent, soluble borate, potassium molybdate, water-soluble melamine nitrogen-phosphorus complex, etc.

[0036] The flame retardant contained in the adhesive layer is an insoluble flame retardant, and the insoluble flame retardant includes one or more combinations of zinc borate, zinc metaborate, zinc fluoroborate, ammonium polyphosphate with a polymerization degree greater than 100, antimony oxide, and the like.

[0037] The adhesive layer contains soybean protein glue using Bayer D03 adhesive, which contains 20% soybean defatted protein and 15% soybean protein isolate, with urea and sodium hydroxide as main modifiers. It is ground into powder by colloid mill and homogenizer in two stages in the state of aqueous solution.

[0038] As described above, the embodiments of the present invention are described in detail, but it is obvious to those skilled in the art that many variations are possible without departing from the inventive point and effect of the present invention. Therefore, all such variations are also included in the protection scope of the present invention.

Claims

1. A method for preparing formaldehyde-free flame-retardant plywood produced by using soybean protein glue, the plywood includes the following processes: impregnating veneer with flame retardant, mixing flame retardant with soybean protein glue, coating, pre-pressing, hot pressing, sanding, veneering, and polishing, characterized in that , The first transverse veneer of the plywood is connected to one side of the first longitudinal veneer, the other side of the first longitudinal veneer is connected to the first glue layer, the other side of the first glue layer is connected to the second longitudinal veneer, the other side of the second longitudinal veneer is connected to the second transverse veneer, the other side of the second transverse veneer is connected to the third longitudinal veneer, the other side of the third longitudinal veneer is connected to the second glue layer, the other side of the second glue layer is connected to the third longitudinal veneer, and the other side of the third longitudinal veneer is connected to the third transverse veneer. The transverse veneer and the longitudinal veneer in the plywood are connected to form a composite board, and the composite board is connected to another composite board through the glue layer to form a multi-layer composite board. The multi-layer composite board contains more than 2 layers of composite boards. The fire retardant grade of the plywood reaches A2 level, no free formaldehyde is released, the average bonding strength is greater than 1.05Mpa, and the glue does not debond after boiling for more than 8 hours; Contains the following steps: Step 1, soaking the veneer in water containing 30%-80% water-soluble flame retardant for about 72 hours, and drying after soaking; Step 2, mixing the water-insoluble flame retardant with the soybean protein glue for standby use; Step 3, the dried veneer is coated with the soy protein glue of step 2, and after paving, pre-pressing, hot pressing, sanding, veneering, and polishing, the soy protein glue formaldehyde-free flame-retardant plywood is obtained; The veneer is impregnated with a flame retardant, and the veneer and soy protein glue are both combined with the flame retardant. The flame retardant used to impregnate the veneer is a water-soluble non-halogen flame retardant, including one or more combinations of monoguanidine phosphate, diguanidine phosphate, ammonium polyphosphate with a polymerization degree of less than 20, silane coupling agent, soluble borate, potassium molybdate, and a water-soluble melamine nitrogen-phosphorus complex. The flame retardant mixed with the soy protein glue is an insoluble powder flame retardant, including one or more combinations of zinc borate, zinc metaborate, zinc fluoroborate, ammonium polyphosphate with a polymerization degree greater than 100, and antimony oxide; the soy protein glue contains Bayer D03 adhesive, and the Bayer D03 adhesive contains 20% soy defatted protein and 15% soy protein isolate, and uses urea and sodium hydroxide as main modifiers. It is made by two-stage homogenization grinding in a colloid mill and a homogenizer in the state of aqueous solution.

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