A composite fireproof furniture board and preparation method thereof

Abstract

The invention discloses a composite fireproof furniture board and a preparation method thereof, belonging to the technical field of fireproof furniture boards. A first layer of isocyanate glue is coated on both sides of a spliced ​​sandwich wood board, and flame retardant films are respectively pasted thereon, and then a second layer of isocyanate glue is coated on the flame retardant films on both sides, and melamine decorative paper is respectively pasted thereon, and the composite fireproof furniture board is obtained by rolling and compounding; a gel material is prepared to make the composite flame retardant powder evenly dispersed, and the pressed flame retardant film is thin, which is conducive to composite application in furniture boards. The expanded graphite in the composite flame retardant powder can be over-expanded to isolate the fire source, and the magnesium carbonate also has a flame retardant effect. The phosphorus-based flame retardant can form a continuous and dense carbon layer with organic matter. The original mesh structure of the gel material can make the integrity of the flame retardant film better, so that the flame retardant film forms a stable flame retardant network after combustion, and prevents the expanded flame retardant layer from peeling off, thereby playing an effective fire prevention role.

Description

Technical Field

[0001] The invention belongs to the technical field of fireproof furniture boards, and in particular relates to a composite fireproof furniture board and a preparation method thereof. Background Art

[0002] Furniture boards refer to various wood boards used to make furniture, including solid wood boards, particle boards, density boards, etc. These boards have different application scenarios due to their characteristics and uses. Eco-board is a type of furniture board with special environmental protection and decorative properties.

[0003] Ecological board, also known as paint-free board or melamine board, is made of two veneers with a sandwich board in the middle and covered with a layer of melamine decorative surface. It is environmentally friendly and only requires the glue used to meet the standards, but its stability is average and may deform after long-term use. It is not recommended to be used as cabinet doors. The scope of application only includes cabinets, cabinets and panel furniture. Ecological boards are generally not fire-resistant, especially some ecological boards that use more glue. The glue will release flammable gases under high temperature conditions, and its fire resistance may be worse, thereby accelerating the spread of fire. Therefore, how to improve the fire resistance of paint-free ecological furniture boards is the current research focus.

[0004] The invention application with publication number CN117359741A discloses a fir core fireproof flame retardant ecological board and its preparation method, wherein the fir board is soaked in a modified flame retardant solution, heated and soaked, taken out, and dried to absolute dryness to obtain the fir core fireproof flame retardant ecological board. However, the spliced ​​sandwich wood board of the ecological board has a limited amount of adsorption of the flame retardant, and after being prepared into a composite ecological board, it is inevitable to use glue, which limits the flame retardant performance of the final product. Summary of the invention

[0005] The purpose of the present invention is to provide a composite fireproof furniture board and a preparation method thereof, and by improving the preparation method of the furniture board, the composite flame retardant layer improves its fireproof performance.

[0006] The purpose of the present invention can be achieved by the following technical solutions: A method for preparing a composite fireproof furniture board comprises the following steps: A first layer of isocyanate glue is applied on both sides of the spliced ​​sandwich wood board, and flame retardant films are respectively pasted thereon. Then a second layer of isocyanate glue is applied on the flame retardant films on both sides, and melamine decorative paper is respectively pasted thereon. The composite fireproof furniture board is obtained by rolling and compounding.

[0007] Furthermore, the flame retardant film is prepared by the following steps: Step 1: Add styrene-maleic anhydride copolymer, deionized water and sodium hydroxide to a reactor at 90-95°C, stir and react at 200-300r / min for 120-150min, cool to 70-75°C, add phosphorus flame retardant, expanded graphite, paraffin, and 1% trisodium citrate aqueous solution to the reactor, stir and emulsify at 8000-10000r / min for 5-8min to obtain a composite emulsion; Furthermore, the usage ratio of styrene-maleic anhydride copolymer, deionized water, sodium hydroxide, phosphorus-based flame retardant, expanded graphite, paraffin and trisodium citrate aqueous solution is 4-5g:250mL:0.8-1g:0.5-0.8g:8-10g:60-80g:800-1000mL.

[0008] Furthermore, the phosphorus-based flame retardant includes, but is not limited to, tricresyl phosphate, triisopropylphenyl phosphate and tributyl phosphate.

[0009] Step 2: Add the composite emulsion and the magnesium acetate solution with a molar concentration of 0.15 mol / L into a clean reactor, stir for 3-3.5 hours at 80-85°C and 200-300 r / min, add the sodium carbonate solution with a molar concentration of 0.165 mol / L into the reactor and continue stirring for 3-3.5 hours, cool naturally, filter, wash the filter cake with deionized water 2-3 times, and vacuum dry at 40-50°C to obtain a composite flame retardant powder.

[0010] Furthermore, the volume ratio of the composite emulsion, the magnesium acetate solution and the sodium carbonate solution is 3:2:2.

[0011] Step 3: Add 1.5% by mass of polyvinyl alcohol solution, composite flame retardant powder, acrylamide, vinyl acetate, methylene bisacrylamide and ammonium persulfate into the reactor, stir at 800-1000r / min for 15-20min, then transfer to the mold for cast spreading, keep warm and cross-link at 60°C for 6-8h to obtain a gel material, then vacuum dry at 40-60°C, press and form to obtain a flame retardant film with a thickness of 0.2-0.6mm.

[0012] Furthermore, the solvent of the polyvinyl alcohol solution with a mass fraction of 1.5% is a mixture of dimethyl sulfoxide and deionized water in a volume ratio of 1:3.

[0013] Furthermore, the mass ratio of the polyvinyl alcohol solution with a mass fraction of 1.5%, the composite flame retardant powder, acrylamide, vinyl acetate, methylene bisacrylamide and ammonium persulfate is 200:5-8:15-15.5:1.6-1.7:0.16-0.17:1.

[0014] Beneficial effects of the present invention: The composite fireproof furniture board of the present invention is further compounded with a flame retardant film between the melamine decorative paper and the spliced ​​sandwich wood board, which can form a stable flame retardant layer on the surface of the spliced ​​sandwich wood board after burning in fire, and has good fireproof and flame retardant effect.

[0015] In the emulsion system of the composite emulsion, the phosphorus-based flame retardant is loaded on the surface of the expanded graphite, and the styrene-maleic anhydride copolymer is used as an anionic surfactant, the hydrophobic end of which points to the paraffin droplets and the hydrophilic end points to the water phase. The formed paraffin micelles cover the expanded graphite, and the paraffin micelles complex the magnesium ions and carbonate ions in the magnesium acetate solution and the sodium carbonate solution. The two ions generate magnesium carbonate particles in situ and deposit on the surface of the paraffin micelles, and assemble into a magnesium carbonate shell, so as to prepare a stable composite flame retardant powder, prevent the loss of flame retardant substances, and ensure the flame retardant effect.

[0016] During the preparation of the flame retardant film, composite flame retardant powder and materials such as acrylamide are prepared into gel materials, so that the composite flame retardant powder is evenly dispersed and the pressed flame retardant film is thin, which is conducive to composite application in furniture panels. The expanded graphite in the composite flame retardant powder can over-expand to isolate the fire source, magnesium carbonate also has a flame retardant effect, and the phosphorus-based flame retardant can form a continuous and dense carbon layer with organic matter. The original mesh structure of the gel material can make the flame retardant film more integrated, so that the flame retardant film forms a stable flame retardant network after combustion, preventing the expanded flame retardant layer from peeling off, thereby playing an effective fire prevention role. DETAILED DESCRIPTION

[0017] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0018] Embodiment 1: This embodiment provides a composite fireproof furniture board, which is prepared by the following preparation method: Step 1: At 90°C, add 4kg styrene-maleic anhydride copolymer, 250L deionized water and 0.8kg sodium hydroxide into the reactor, stir and react at 200r / min for 120min, cool to 70°C, add 0.5kg tricresyl phosphate, 8kg expanded graphite, 60kg paraffin and 800L 1% trisodium citrate aqueous solution into the reactor, stir and emulsify at 8000r / min for 5min to obtain a composite emulsion.

[0019] Step 2: Add 900L of the composite emulsion and 600L of a magnesium acetate solution with a molar concentration of 0.15mol / L into a clean reactor, stir for 3h at 80°C and 200r / min, add 600L of a sodium carbonate solution with a molar concentration of 0.165mol / L into the reactor and continue stirring for 3h, cool naturally, filter, wash the filter cake twice with deionized water, and vacuum dry at 40°C to obtain a composite flame retardant powder.

[0020] Step 3: Dimethyl sulfoxide and deionized water are mixed into a solvent in a volume ratio of 1:3, PVA-1750 is added to prepare a polyvinyl alcohol solution with a mass fraction of 1.5%, 200 kg of polyvinyl alcohol solution with a mass fraction of 1.5%, 5 kg of composite flame retardant powder, 15 kg of acrylamide, 1.6 kg of vinyl acetate, 0.16 kg of methylene bisacrylamide and 1 kg of ammonium persulfate are added into the reactor, stirred at 800 r / min for 15 min, then transferred to the mold for cast spreading, kept warm and cross-linked at 60 ° C for 6 h to obtain a gel material, which is then vacuum dried at 40 ° C and pressed into shape to obtain a flame retardant film with a thickness of 0.2 mm.

[0021] Step 4: Apply a first layer of isocyanate glue on both sides of the spliced ​​sandwich wood board, and stick flame retardant films on them respectively. Then apply a second layer of isocyanate glue on the flame retardant films on both sides, and stick melamine decorative paper on them respectively. Roll-press and compound them to obtain a composite fireproof furniture board.

[0022] Embodiment 2: This embodiment provides a composite fireproof furniture board, which is prepared by the following preparation method: Step 1: At 92°C, add 4.5kg of styrene-maleic anhydride copolymer, 250L of deionized water and 0.9kg of sodium hydroxide into the reactor, stir and react at 250r / min for 135min, cool to 72°C, add 0.65kg of triisopropylphenyl phosphate, 9kg of expanded graphite, 70kg of paraffin and 900L of 1% trisodium citrate aqueous solution into the reactor, stir and emulsify at 9000r / min for 6min to obtain a composite emulsion.

[0023] Step 2: Add 900L of the composite emulsion and 600L of a magnesium acetate solution with a molar concentration of 0.15mol / L into a clean reactor, stir for 3.2h at 82°C and 250r / min, add 600L of a sodium carbonate solution with a molar concentration of 0.165mol / L into the reactor and continue stirring for 3.2h, cool naturally, filter, wash the filter cake with deionized water 3 times, and vacuum dry at 45°C to obtain a composite flame retardant powder.

[0024] Step 3: Dimethyl sulfoxide and deionized water are mixed into a solvent in a volume ratio of 1:3, PVA-1750 is added to prepare a polyvinyl alcohol solution with a mass fraction of 1.5%, 200 kg of polyvinyl alcohol solution with a mass fraction of 1.5%, 6.5 kg of composite flame retardant powder, 15.2 kg of acrylamide, 1.65 kg of vinyl acetate, 0.165 kg of methylene bisacrylamide and 1 kg of ammonium persulfate are added into the reactor, stirred at 900 r / min for 18 min, then transferred to the mold for cast spreading, kept warm and cross-linked at 60 ° C for 7 h to obtain a gel material, which is then vacuum dried at 50 ° C and pressed into shape to obtain a flame retardant film with a thickness of 0.4 mm.

[0025] Step 4: Apply a first layer of isocyanate glue on both sides of the spliced ​​sandwich wood board, and stick flame retardant films on them respectively. Then apply a second layer of isocyanate glue on the flame retardant films on both sides, and stick melamine decorative paper on them respectively. Roll-press and compound them to obtain a composite fireproof furniture board.

[0026] Embodiment 3: This embodiment provides a composite fireproof furniture board, which is prepared by the following preparation method: Step 1: At 95°C, add 5kg of styrene-maleic anhydride copolymer, 250L of deionized water and 1kg of sodium hydroxide to the reactor, stir and react at 300r / min for 150min, cool to 75°C, add 0.8kg of tributyl phosphate, 10kg of expanded graphite, 80kg of paraffin and 1000L of 1% trisodium citrate aqueous solution to the reactor, stir and emulsify at 10000r / min for 8min to obtain a composite emulsion.

[0027] Step 2: Add 900L of the composite emulsion and 600L of a magnesium acetate solution with a molar concentration of 0.15mol / L into a clean reactor, stir for 3.5h at 85°C and 300r / min, add 600L of a sodium carbonate solution with a molar concentration of 0.165mol / L into the reactor and continue stirring for 3.5h, cool naturally, filter, wash the filter cake with deionized water 3 times, and vacuum dry at 50°C to obtain a composite flame retardant powder.

[0028] Step 3: Dimethyl sulfoxide and deionized water are mixed into a solvent in a volume ratio of 1:3, PVA-1750 is added to prepare a polyvinyl alcohol solution with a mass fraction of 1.5%, 200 kg of polyvinyl alcohol solution with a mass fraction of 1.5%, 8 kg of composite flame retardant powder, 15.5 kg of acrylamide, 1.7 kg of vinyl acetate, 0.17 kg of methylene bisacrylamide and 1 kg of ammonium persulfate are added into the reactor, stirred at 1000 r / min for 20 min, then transferred to the mold for cast spreading, kept warm and cross-linked at 60 ° C for 8 h to obtain a gel material, which is then vacuum dried at 60 ° C and pressed into shape to obtain a flame retardant film with a thickness of 0.6 mm.

[0029] Step 4: Apply a first layer of isocyanate glue on both sides of the spliced ​​sandwich wood board, and stick flame retardant films on them respectively. Then apply a second layer of isocyanate glue on the flame retardant films on both sides, and stick melamine decorative paper on them respectively. Roll-press and compound them to obtain a composite fireproof furniture board.

[0030] Comparative Example 1: Based on Example 3, the expanded graphite was replaced with ordinary graphite, and the other steps remained unchanged to prepare a composite fireproof furniture board.

[0031] Comparative Example 2: Based on Example 3, the composite emulsion in step 1 is directly centrifuged and precipitated, and the composite flame retardant powder is replaced after drying and crushing, and the flame retardant film is directly prepared according to the steps in step 3 to prepare a composite fireproof furniture board.

[0032] Comparative Example 3: Based on Example 3, the flame retardant film is not compounded, and the other steps remain unchanged to prepare a composite fireproof furniture board.

[0033] Comparative Example 4: On the basis of Example 3, without compounding the flame retardant film, the composite flame retardant powder in step 2 is mixed with isocyanate glue at an addition amount of 30wt%, and then melamine decorative paper is pasted and rolled to prepare a composite fireproof furniture board.

[0034] The raw materials in the embodiments and comparative examples are all conventional commercially available products, and the material of the spliced ​​sandwich wood board is fir.

[0035] Performance tests were performed on Examples 1 to 3 and Comparative Examples 1 to 4. The fire retardant effects of different furniture panels were tested according to GB / T 2046-2009. The samples were vertically fixed in the combustion tube of the limiting oxygen index tester. A nitrogen-oxygen mixed gas flowed through the combustion tube from bottom to top in a certain proportion. The sample was ignited by the top ignition method using an igniter. The burning time and the length of the sample burning were recorded at the same time. The minimum oxygen concentration that just maintained balanced combustion was determined according to the criterion. Five parallel tests were performed for each group, and the results were averaged. The oxygen index of each group was recorded. The results are shown in Table 1: Table 1 project Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Oxygen Index / LOI% 43.8 44.3 46.5 38.2 35.6 26.4 33.5 It can be seen from Table 1 that the oxygen index in Examples to Example 3 is higher, and the oxygen index in Comparative Example 1 decreases because the expanded graphite can increase the distance between the surface layer of the board and the sandwich board after it expands when heated by fire, increase the distance between the combustible material and the open flame, and improve the flame retardant effect; the oxygen index in Comparative Example 2 decreases because the composite flame retardant powder coated with magnesium carbonate is more stable, magnesium carbonate also has a flame retardant effect, and the flame retardant material in Comparative Example 2 is lost during the preparation process, resulting in a decrease in the flame retardant effect; the oxygen index in Comparative Example 4 decreases because by preparing the flame retardant film, the original mesh structure of the gel material can make the flame retardant film have better integrity, and after burning in fire, the phosphorus-based flame retardant can form a continuous and dense carbon layer with organic matter, forming a stable flame retardant network to prevent the expanded flame retardant layer from peeling off, thereby playing an effective fire prevention role.

[0036] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a composite fireproof furniture board, It is characterized in that The steps include: A first layer of isocyanate glue is applied on both sides of the spliced ​​sandwich wood board, and flame retardant films are respectively attached thereto, and then a second layer of isocyanate glue is applied on the flame retardant films on both sides, and melamine decorative paper is respectively attached thereto, and the composite fireproof furniture board is obtained by rolling and laminating; The flame retardant film is prepared by the following steps: Add 1.5wt% polyvinyl alcohol solution, composite flame retardant powder, acrylamide, vinyl acetate, methylenebisacrylamide and ammonium persulfate into a reactor, stir at 800-1000r / min for 15-20min, then transfer to a mold for cast spreading, keep warm at 60℃ for cross-linking for 6-8h to obtain a gel material, vacuum dry, and press to obtain a flame retardant film with a thickness of 0.2-0.6mm.

2. A method for preparing a composite fireproof furniture board according to claim 1, It is characterized in that The solvent of the polyvinyl alcohol solution is a mixture of dimethyl sulfoxide and deionized water in a volume ratio of 1:

3.

3. A method for preparing a composite fireproof furniture board according to claim 1, It is characterized in that The mass ratio of the polyvinyl alcohol solution, the composite flame retardant powder, acrylamide, vinyl acetate, methylenebisacrylamide and ammonium persulfate is 200:5-8:15-15.5:1.6-1.7:0.16-0.17:

1.

4. The method for preparing a composite fireproof furniture board according to claim 1, It is characterized in that The composite flame retardant powder is prepared by the following steps: Add the composite emulsion and a 0.15 mol / L magnesium acetate solution into a clean reactor, stir at 80-85°C and 200-300 r / min for 3-3.5 hours, add a 0.165 mol / L sodium carbonate solution into the reactor and continue stirring for 3-3.5 hours, cool naturally, filter, wash, and vacuum dry to obtain a composite flame retardant powder.

5. A method for preparing a composite fireproof furniture board according to claim 4, It is characterized in that The volume ratio of the composite emulsion, the magnesium acetate solution and the sodium carbonate solution is 3:2:

2.

6. A method for preparing a composite fireproof furniture board according to claim 4, It is characterized in that The composite emulsion is prepared by the following steps: At 90-95° C., styrene-maleic anhydride copolymer, deionized water and sodium hydroxide are added to a reactor, and the mixture is stirred at 200-300 r / min for 120-150 min. The mixture is cooled to 70-75° C., a phosphorus flame retardant, expanded graphite, paraffin and 1 wt% trisodium citrate aqueous solution are added to the reactor, and the mixture is stirred and emulsified at 8000-10000 r / min for 5-8 min to obtain a composite emulsion.

7. A method for preparing a composite fireproof furniture board according to claim 6, It is characterized in that The dosage ratio of the styrene-maleic anhydride copolymer, deionized water, sodium hydroxide, phosphorus-based flame retardant, expanded graphite, paraffin and trisodium citrate aqueous solution is 4-5g: 250mL: 0.8-1g: 0.5-0.8g: 8-10g: 60-80g: 800-1000mL.

8. The method for preparing a composite fireproof furniture board according to claim 6, It is characterized in that The phosphorus-based flame retardant is any one of tricresyl phosphate, triisopropylphenyl phosphate and tributyl phosphate.