High strength fire retardant flake board and method of making same

Abstract

The application discloses a kind of high-strength flame-retardant shaving board, which is made of the following raw material components by weight: shavings 800-1200 parts, composite adhesive 50-200 parts. The composite adhesive is made of the following components by weight: modified soybean glue 20-80 parts, modified guar gum 20-80 parts, curing agent 5-20 parts, flame retardant 5-10 parts. The high-strength flame-retardant shaving board prepared by the application has high strength and good mechanical properties. The combination of modified soybean glue and modified guar gum in the adhesive component improves the internal glue bonding strength of the material. The combination of hydroxyethyl melamine and sodium tetraborate improves the static bending strength of the material. The combination of urea phosphate and halloysite nanotubes improves the flame retardant performance of the material.

Description

Technical Field

[0001] This invention belongs to the field of particleboard technology, specifically relating to a high-strength flame-retardant particleboard and its preparation method. Background Technology

[0002] Particleboard is a type of engineered wood product. It is made from wood processing residues, small-diameter timber, and wood chips, which are processed into wood chips using specialized equipment. These chips are then mixed with adhesives (such as urea-formaldehyde resin) and pressed under high temperature and pressure. Particleboard has a uniform structure, a smooth surface that is easy to laminate or paint; it has good sound absorption and heat insulation properties; good lateral load-bearing capacity; and it is inexpensive with high raw material utilization.

[0003] Particleboard has significant defects in mechanical and flame-retardant properties, limiting its application in high-end and specialized engineering fields. In terms of mechanical properties, the primary defect of particleboard is its insufficient nail-holding power. Because the board is made of interwoven wood chips and adhesives, its internal structure is not as dense as solid wood. When a nail is screwed in, the wood chips are easily crushed rather than forming a tight thread, resulting in low screw holding power and pull-out strength, making it particularly unsuitable for connectors that are repeatedly disassembled and reassembled. Secondly, its bending strength and modulus of elasticity are limited, making it prone to creep and even breakage under concentrated loads; for example, as a bookshelf shelf, it will show significant sagging deformation after long-term use. Furthermore, particleboard has poor transverse tensile strength (internal bond strength), and if the manufacturing process is not properly controlled, delamination and cracking can easily occur at the glued interface between the wood chips. Regarding flame-retardant properties, as a wood-based material, the organic components of particleboard (cellulose, hemicellulose, lignin) are naturally flammable, with a limiting oxygen index typically only 20-25%, making it extremely easy to ignite and rapidly spread flames. More seriously, the board contains a large amount of organic adhesives such as urea-formaldehyde resin, which decompose and release flammable gases at high temperatures, further fueling the fire. Currently common flame-retardant modification methods, such as adding phosphorus-nitrogen flame retardants to the raw materials, can improve fire resistance time, but they significantly degrade the mechanical strength of the particleboard. This is because the poor compatibility between flame retardants and adhesives weakens the bonding interface between the wood chips, leading to a further decrease in internal bond strength and nail-holding power. Simultaneously, flame retardants are prone to moisture absorption and migration, not only reducing the long-term flame-retardant stability of the board but also exacerbating its inherent defect of swelling when exposed to moisture. Summary of the Invention

[0004] The purpose of this invention is to provide a high-strength flame-retardant particleboard and its preparation method.

[0005] A high-strength flame-retardant particleboard is made from the following raw material components in parts by weight: 800-1200 parts of particleboard and 50-200 parts of composite adhesive.

[0006] The composite adhesive is made of the following components in parts by weight: 20-80 parts modified soybean gum, 20-80 parts modified guar gum, 5-20 parts curing agent, and 5-10 parts flame retardant.

[0007] The modified soybean gum is prepared as follows: 5-10 parts by weight of soybean protein and 20-40 parts by weight are mixed and stirred for 15-30 minutes to obtain a soybean protein solution system; the system temperature is adjusted to 40-60℃, and 1-5 parts of polycaprolactam are added to the system and stirred for 30-60 minutes; the system pH is adjusted to 8-10 and stirred for 15-30 minutes; 0.2-1.5 parts of ammonium persulfate are added to the system and stirred for 15-30 minutes; 1-4 parts of caffeic acid are added to the system and stirred for 15-30 minutes to obtain the final product.

[0008] The modified guar gum is prepared as follows: 60-100 parts by weight of water and 120-180 parts by weight of dimethylamine are mixed evenly, 60-100 parts by weight of guar gum powder are added, and the mixture is stirred for 0.5-1.5 hours. Then, 0.5-1.2 parts by weight of N-vinyl-2-pyrrolidone and 0.5-1.2 parts by weight of N-alkylsulfonated acrylamide are added, and the mixture is stirred for 15-30 minutes. Finally, 0.5-1.2 parts by weight of potassium persulfate are added, the reaction vessel is sealed, and the mixture is stirred for 24-48 hours to obtain the modified guar gum.

[0009] The curing agent is a mixture of hydroxyethyl melamine and sodium tetraborate in a mass ratio of (1-3):1.

[0010] The flame retardant is a mixture of urea phosphate and halloysite nanotubes in a mass ratio of (1-3):1.

[0011] The preparation method of the high-strength flame-retardant particleboard is carried out according to the following steps:

[0012] (1) Preparation of wood shavings: The wood is peeled, sieved, and impurities are removed. The wood is then added to a pulverizer and processed into wood shavings to obtain wood shaving raw materials.

[0013] (2) Preparation of glue-mixed wood shavings: Dry the wood shavings raw material, place them in a drum mixer, add modified soybean glue, modified guar gum and flame retardant, stir at 500-1000 r / min for 1-3 h, add curing agent, stir at 1000-2000 r / min for 1-3 min, dry to a moisture content of 2-6 wt%, and obtain glue-mixed wood shavings;

[0014] (3) Preparation of particleboard: The glue-mixed wood chips are laid into a single layer of board blank, placed in a steel mold frame, and then placed in a hot press for hot pressing, demolding and curing to obtain particleboard.

[0015] The wood shavings in step (1) are 80-160mm long, 20-60mm wide, and 0.3-0.6mm thick.

[0016] The hot pressing pressure in step (3) is 3-6 MPa, the hot pressing time is 6-15 min, and the hot pressing temperature is 120-150℃.

[0017] The beneficial effects of the present invention are as follows: The high-strength flame-retardant particleboard prepared by the present invention has high strength and good mechanical properties. The combination of modified soybean gum and modified guar gum in the adhesive component improves the internal bonding strength of the material. The combination of hydroxyethyl melamine and sodium tetraborate improves the static bending strength of the material. The combination of urea phosphate and halloysite nanotubes improves the flame-retardant properties of the material. Detailed Implementation

[0018] To facilitate understanding of the present invention, a more comprehensive description will be given below. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the present invention.

[0019] Example 1

[0020] A high-strength flame-retardant particleboard is made from the following raw material components in parts by weight: 1000 parts particleboard and 150 parts composite adhesive. The composite adhesive is made from the following components in parts by weight: 65 parts modified soybean gum, 65 parts modified guar gum, 12 parts curing agent, and 8 parts antibacterial agent. The curing agent is a mixture of hydroxyethyl melamine and sodium tetraborate in a mass ratio of 2:1. The flame retardant is a mixture of urea phosphate and halloysite nanotubes in a mass ratio of 2:1.

[0021] The modified soybean gum is prepared as follows: 8 parts by weight of soybean protein and 25 parts by weight are mixed and stirred for 20 minutes to obtain a soybean protein solution system; the system temperature is adjusted to 50℃, 4 parts by weight of polycaprolactam are added to the system and stirred for 50 minutes; the system pH is adjusted to 9 and stirred for 20 minutes; 0.6 parts by weight of ammonium persulfate are added to the system and stirred for 20 minutes; 3 parts by weight of caffeic acid are added to the system and stirred for 20 minutes to obtain the modified soybean gum.

[0022] The modified guar gum is prepared as follows: 80 parts by weight of water and 140 parts by weight of dimethylamine are mixed evenly, 80 parts by weight of guar gum powder are added, and the mixture is stirred for 1 hour. Then, 0.8 parts by weight of N-vinyl-2-pyrrolidone and 0.8 parts by weight of N-alkylsulfonated acrylamide are added, and the mixture is stirred for 20 minutes. Finally, 0.8 parts by weight of potassium persulfate are added, the reaction vessel is sealed, and the mixture is stirred for 36 hours to obtain the modified guar gum.

[0023] The preparation method of the high-strength flame-retardant particleboard is carried out according to the following steps:

[0024] (1) Preparation of wood shavings: The wood is peeled, sieved, and impurities are removed. The wood is then put into a pulverizer and processed into wood shavings to obtain wood shaving raw material. The wood shavings are 100 mm long, 30 mm wide, and 0.4 mm thick.

[0025] (2) Preparation of Glue-mixed wood shavings: Dry the wood shavings raw material, place it in a drum mixer, add modified soybean glue, modified guar gum and flame retardant, stir at 800 r / min for 2 h, add curing agent, stir at 1500 r / min for 2 min, and dry to a moisture content of 4 wt% to obtain Glue-mixed wood shavings;

[0026] (3) Preparation of particleboard: The glue-mixed wood chips are laid into a single layer of board blank, placed in a steel film frame, and placed in a hot press for hot pressing, demolding and curing to obtain particleboard; the hot pressing pressure is 4MPa, the hot pressing time is 8min, and the hot pressing temperature is 130℃.

[0027] Example 2

[0028] A high-strength flame-retardant particleboard is made from the following raw material components in parts by weight: 850 parts particleboard and 75 parts composite adhesive. The composite adhesive is made from the following components in parts by weight: 30 parts modified soybean gum, 30 parts modified guar gum, 10 parts curing agent, and 5 parts antibacterial agent. The curing agent is a mixture of hydroxyethyl melamine and sodium tetraborate in a 1:1 mass ratio. The flame retardant is a mixture of urea phosphate and halloysite nanotubes in a 1:1 mass ratio.

[0029] The modified soybean gum is prepared as follows: 6 parts by weight of soybean protein and 22 parts by weight are mixed and stirred for 15 minutes to obtain a soybean protein solution system; the system temperature is adjusted to 45℃, 2 parts by weight of polycaprolactam are added to the system, and stirred for 40 minutes; the system pH is adjusted to 8.5, and stirred for 15 minutes; 0.3 parts by weight of ammonium persulfate are added to the system, and stirred for 15 minutes; 2 parts by weight of caffeic acid are added to the system, and stirred for 15 minutes to obtain the final product.

[0030] The modified guar gum is prepared as follows: 70 parts by weight of water and 130 parts by weight of dimethylamine are mixed evenly, 70 parts by weight of guar gum powder are added, and the mixture is stirred for 0.5 h. Then, 0.6 parts by weight of N-vinyl-2-pyrrolidone and 0.6 parts by weight of N-alkylsulfonated acrylamide are added, and the mixture is stirred for 15 min. Finally, 0.6 parts by weight of potassium persulfate are added, the reaction vessel is sealed, and the mixture is stirred for 24 h to obtain the modified guar gum.

[0031] The preparation method of the high-strength flame-retardant particleboard is carried out according to the following steps:

[0032] (1) Preparation of wood shavings: The wood is peeled, sieved, and impurities are removed. The wood is then added to a pulverizer and processed into wood shavings to obtain wood shaving raw material. The wood shavings are 90 mm long, 25 mm wide, and 0.3 mm thick.

[0033] (2) Preparation of Glue-mixed wood shavings: Dry the wood shavings raw material, place it in a drum mixer, add modified soybean glue, modified guar gum and flame retardant, stir at 600 r / min for 1 h, add curing agent, stir at 1200 r / min for 3 min, and dry to a moisture content of 3 wt% to obtain Glue-mixed wood shavings;

[0034] (3) Preparation of particleboard: The glue-mixed wood chips are laid into a single layer of board blank, placed in a steel film frame, and placed in a hot press for hot pressing, demolding and curing to obtain particleboard; the hot pressing pressure is 3MPa, the hot pressing time is 8min, and the hot pressing temperature is 125℃.

[0035] Example 3

[0036] A high-strength flame-retardant particleboard is made from the following raw material components in parts by weight: 1100 parts particleboard and 180 parts composite adhesive. The composite adhesive is made from the following components in parts by weight: 75 parts modified soybean gum, 75 parts modified guar gum, 20 parts curing agent, and 10 parts antibacterial agent. The curing agent is a mixture of hydroxyethyl melamine and sodium tetraborate in a mass ratio of 3:1. The flame retardant is a mixture of urea phosphate and halloysite nanotubes in a mass ratio of 3:1.

[0037] The modified soybean gum is prepared as follows: 10 parts by weight of soybean protein and 30 parts by water are mixed and stirred for 30 minutes to obtain a soybean protein solution system; the system temperature is adjusted to 55°C, 4 parts of polycaprolactam are added to the system, and stirred for 60 minutes; the system pH is adjusted to 9.5, and stirred for 30 minutes; 1.5 parts of ammonium persulfate are added to the system, and stirred for 30 minutes; 4 parts of caffeic acid are added to the system, and stirred for 30 minutes to obtain the modified soybean gum.

[0038] The modified guar gum is prepared as follows: 90 parts by weight of water and 170 parts by weight of dimethylamine are mixed evenly, 90 parts by weight of guar gum powder are added, and the mixture is stirred for 1.5 hours. Then, 1 part by weight of N-vinyl-2-pyrrolidone and 1 part by weight of N-alkylsulfonated acrylamide are added, and the mixture is stirred for 30 minutes. Finally, 1 part by weight of potassium persulfate is added, the reaction vessel is sealed, and the mixture is stirred for 48 hours to obtain the modified guar gum.

[0039] The preparation method of the high-strength flame-retardant particleboard is carried out according to the following steps:

[0040] (1) Preparation of wood shavings: The wood is peeled, sieved, and impurities are removed. The wood is then put into a pulverizer and processed into wood shavings to obtain wood shaving raw material. The wood shavings are 140 mm long, 50 mm wide, and 0.5 mm thick.

[0041] (2) Preparation of Glue-mixed wood shavings: Dry the wood shavings raw material, place it in a drum mixer, add modified soybean glue, modified guar gum and flame retardant, stir at 800 r / min for 2 h, add curing agent, stir at 1800 r / min for 2 min, dry to a moisture content of 4.5 wt%, and obtain Glue-mixed wood shavings;

[0042] (3) Preparation of particleboard: The glue-mixed wood chips are laid into a single layer of board blank, placed in a steel film frame, and placed in a hot press for hot pressing, demolding and curing to obtain particleboard; the hot pressing pressure is 5MPa, the hot pressing time is 12min, and the hot pressing temperature is 140℃.

[0043] Comparative Example 1

[0044] A high-strength flame-retardant particleboard is made from the following raw material components in parts by weight: 1000 parts particleboard and 150 parts composite adhesive. The composite adhesive is made from the following components in parts by weight: 130 parts modified soybean adhesive, 12 parts curing agent, and 8 parts antibacterial agent. The curing agent is a mixture of hydroxyethyl melamine and sodium tetraborate in a mass ratio of 2:1. The flame retardant is a mixture of urea phosphate and halloysite nanotubes in a mass ratio of 2:1.

[0045] The modified soybean gum is prepared as follows: 8 parts by weight of soybean protein and 25 parts by weight are mixed and stirred for 20 minutes to obtain a soybean protein solution system; the system temperature is adjusted to 50℃, 4 parts by weight of polycaprolactam are added to the system and stirred for 50 minutes; the system pH is adjusted to 9 and stirred for 20 minutes; 0.6 parts by weight of ammonium persulfate are added to the system and stirred for 20 minutes; 3 parts by weight of caffeic acid are added to the system and stirred for 20 minutes to obtain the modified soybean gum.

[0046] The preparation method of the high-strength flame-retardant particleboard is carried out according to the following steps:

[0047] (1) Preparation of wood shavings: The wood is peeled, sieved, and impurities are removed. The wood is then put into a pulverizer and processed into wood shavings to obtain wood shaving raw material. The wood shavings are 100 mm long, 30 mm wide, and 0.4 mm thick.

[0048] (2) Preparation of Glue-mixed wood shavings: Dry the wood shavings raw material, place it in a drum mixer, add modified soybean glue and flame retardant, stir at 800 r / min for 2 h, add curing agent, stir at 1500 r / min for 2 min, and dry to a moisture content of 4 wt% to obtain Glue-mixed wood shavings;

[0049] (3) Preparation of particleboard: The glue-mixed wood chips are laid into a single layer of board blank, placed in a steel film frame, and placed in a hot press for hot pressing, demolding and curing to obtain particleboard; the hot pressing pressure is 4MPa, the hot pressing time is 8min, and the hot pressing temperature is 130℃.

[0050] Comparative Example 2

[0051] A high-strength flame-retardant particleboard is made from the following raw material components in parts by weight: 1000 parts particleboard and 150 parts composite adhesive. The composite adhesive is made from the following components in parts by weight: 130 parts modified guar gum, 12 parts curing agent, and 8 parts antibacterial agent. The curing agent is a mixture of hydroxyethyl melamine and sodium tetraborate in a mass ratio of 2:1. The flame retardant is a mixture of urea phosphate and halloysite nanotubes in a mass ratio of 2:1.

[0052] The modified guar gum is prepared as follows: 80 parts by weight of water and 140 parts by weight of dimethylamine are mixed evenly, 80 parts by weight of guar gum powder are added, and the mixture is stirred for 1 hour. Then, 0.8 parts by weight of N-vinyl-2-pyrrolidone and 0.8 parts by weight of N-alkylsulfonated acrylamide are added, and the mixture is stirred for 20 minutes. Finally, 0.8 parts by weight of potassium persulfate are added, the reaction vessel is sealed, and the mixture is stirred for 36 hours to obtain the modified guar gum.

[0053] The preparation method of the high-strength flame-retardant particleboard is carried out according to the following steps:

[0054] (1) Preparation of wood shavings: The wood is peeled, sieved, and impurities are removed. The wood is then put into a pulverizer and processed into wood shavings to obtain wood shaving raw material. The wood shavings are 100 mm long, 30 mm wide, and 0.4 mm thick.

[0055] (2) Preparation of guar gum shavings: Dry the shavings raw material, place it in a drum mixer, add modified guar gum and flame retardant, stir at 800 r / min for 2 h, add curing agent, stir at 1500 r / min for 2 min, and dry to a moisture content of 4 wt% to obtain guar gum shavings.

[0056] (3) Preparation of particleboard: The glue-mixed wood chips are laid into a single layer of board blank, placed in a steel film frame, and placed in a hot press for hot pressing, demolding and curing to obtain particleboard; the hot pressing pressure is 4MPa, the hot pressing time is 8min, and the hot pressing temperature is 130℃.

[0057] Comparative Example 3

[0058] A high-strength flame-retardant particleboard is made from the following raw material components in parts by weight: 1000 parts particleboard and 150 parts composite adhesive. The composite adhesive is made from the following components in parts by weight: 65 parts modified soybean gum, 65 parts modified guar gum, 12 parts hydroxyethyl melamine, and 8 parts antibacterial agent. The flame retardant is a mixture of urea phosphate and halloysite nanotubes in a mass ratio of 2:1.

[0059] The modified soybean gum is prepared as follows: 8 parts by weight of soybean protein and 25 parts by weight are mixed and stirred for 20 minutes to obtain a soybean protein solution system; the system temperature is adjusted to 50℃, 4 parts by weight of polycaprolactam are added to the system and stirred for 50 minutes; the system pH is adjusted to 9 and stirred for 20 minutes; 0.6 parts by weight of ammonium persulfate are added to the system and stirred for 20 minutes; 3 parts by weight of caffeic acid are added to the system and stirred for 20 minutes to obtain the modified soybean gum.

[0060] The modified guar gum is prepared as follows: 80 parts by weight of water and 140 parts by weight of dimethylamine are mixed evenly, 80 parts by weight of guar gum powder are added, and the mixture is stirred for 1 hour. Then, 0.8 parts by weight of N-vinyl-2-pyrrolidone and 0.8 parts by weight of N-alkylsulfonated acrylamide are added, and the mixture is stirred for 20 minutes. Finally, 0.8 parts by weight of potassium persulfate are added, the reaction vessel is sealed, and the mixture is stirred for 36 hours to obtain the modified guar gum.

[0061] The preparation method of the high-strength flame-retardant particleboard is carried out according to the following steps:

[0062] (1) Preparation of wood shavings: The wood is peeled, sieved, and impurities are removed. The wood is then put into a pulverizer and processed into wood shavings to obtain wood shaving raw material. The wood shavings are 100 mm long, 30 mm wide, and 0.4 mm thick.

[0063] (2) Preparation of Glue-mixed wood shavings: Dry the wood shavings raw material, place it in a drum mixer, add modified soybean gum, modified guar gum and flame retardant, stir at 800 r / min for 2 h, add hydroxyethyl melamine, stir at 1500 r / min for 2 min, and dry to a moisture content of 4 wt% to obtain Glue-mixed wood shavings.

[0064] (3) Preparation of particleboard: The glue-mixed wood chips are laid into a single layer of board blank, placed in a steel film frame, and placed in a hot press for hot pressing, demolding and curing to obtain particleboard; the hot pressing pressure is 4MPa, the hot pressing time is 8min, and the hot pressing temperature is 130℃.

[0065] Comparative Example 4

[0066] A high-strength flame-retardant particleboard is made from the following raw material components in parts by weight: 1000 parts particleboard and 150 parts composite adhesive. The composite adhesive is made from the following components in parts by weight: 65 parts modified soybean gum, 65 parts modified guar gum, 12 parts sodium tetraborate, and 8 parts antibacterial agent. The flame retardant is a mixture of urea phosphate and halloysite nanotubes in a mass ratio of 2:1.

[0067] The modified soybean gum is prepared as follows: 8 parts by weight of soybean protein and 25 parts by weight are mixed and stirred for 20 minutes to obtain a soybean protein solution system; the system temperature is adjusted to 50℃, 4 parts by weight of polycaprolactam are added to the system and stirred for 50 minutes; the system pH is adjusted to 9 and stirred for 20 minutes; 0.6 parts by weight of ammonium persulfate are added to the system and stirred for 20 minutes; 3 parts by weight of caffeic acid are added to the system and stirred for 20 minutes to obtain the modified soybean gum.

[0068] The modified guar gum is prepared as follows: 80 parts by weight of water and 140 parts by weight of dimethylamine are mixed evenly, 80 parts by weight of guar gum powder are added, and the mixture is stirred for 1 hour. Then, 0.8 parts by weight of N-vinyl-2-pyrrolidone and 0.8 parts by weight of N-alkylsulfonated acrylamide are added, and the mixture is stirred for 20 minutes. Finally, 0.8 parts by weight of potassium persulfate are added, the reaction vessel is sealed, and the mixture is stirred for 36 hours to obtain the modified guar gum.

[0069] The preparation method of the high-strength flame-retardant particleboard is carried out according to the following steps:

[0070] (1) Preparation of wood shavings: The wood is peeled, sieved, and impurities are removed. The wood is then put into a pulverizer and processed into wood shavings to obtain wood shaving raw material. The wood shavings are 100 mm long, 30 mm wide, and 0.4 mm thick.

[0071] (2) Preparation of Glue-mixed wood shavings: Dry the wood shavings raw material, place it in a drum mixer, add modified soybean gum, modified guar gum and flame retardant, stir at 800 r / min for 2 h, add sodium tetraborate, stir at 1500 r / min for 2 min, dry to a moisture content of 4 wt%, and obtain Glue-mixed wood shavings.

[0072] (3) Preparation of particleboard: The glue-mixed wood chips are laid into a single layer of board blank, placed in a steel film frame, and placed in a hot press for hot pressing, demolding and curing to obtain particleboard; the hot pressing pressure is 4MPa, the hot pressing time is 8min, and the hot pressing temperature is 130℃.

[0073] Comparative Example 5

[0074] A high-strength flame-retardant particleboard is made from the following raw material components in parts by weight: 1000 parts particleboard and 150 parts composite adhesive. The composite adhesive is made from the following components in parts by weight: 65 parts modified soybean gum, 65 parts modified guar gum, 12 parts curing agent, and 8 parts urea phosphate. The curing agent is a mixture of hydroxyethyl melamine and sodium tetraborate in a mass ratio of 2:1.

[0075] The modified soybean gum is prepared as follows: 8 parts by weight of soybean protein and 25 parts by weight are mixed and stirred for 20 minutes to obtain a soybean protein solution system; the system temperature is adjusted to 50℃, 4 parts by weight of polycaprolactam are added to the system and stirred for 50 minutes; the system pH is adjusted to 9 and stirred for 20 minutes; 0.6 parts by weight of ammonium persulfate are added to the system and stirred for 20 minutes; 3 parts by weight of caffeic acid are added to the system and stirred for 20 minutes to obtain the modified soybean gum.

[0076] The modified guar gum is prepared as follows: 80 parts by weight of water and 140 parts by weight of dimethylamine are mixed evenly, 80 parts by weight of guar gum powder are added, and the mixture is stirred for 1 hour. Then, 0.8 parts by weight of N-vinyl-2-pyrrolidone and 0.8 parts by weight of N-alkylsulfonated acrylamide are added, and the mixture is stirred for 20 minutes. Finally, 0.8 parts by weight of potassium persulfate are added, the reaction vessel is sealed, and the mixture is stirred for 36 hours to obtain the modified guar gum.

[0077] The preparation method of the high-strength flame-retardant particleboard is carried out according to the following steps:

[0078] (1) Preparation of wood shavings: The wood is peeled, sieved, and impurities are removed. The wood is then put into a pulverizer and processed into wood shavings to obtain wood shaving raw material. The wood shavings are 100 mm long, 30 mm wide, and 0.4 mm thick.

[0079] (2) Preparation of Glue-mixed wood shavings: Dry the wood shavings raw material, place it in a drum mixer, add modified soybean glue, modified guar gum and urea phosphate, stir at 800 r / min for 2 h, add curing agent, stir at 1500 r / min for 2 min, and dry to a moisture content of 4 wt% to obtain Glue-mixed wood shavings;

[0080] (3) Preparation of particleboard: The glue-mixed wood chips are laid into a single layer of board blank, placed in a steel film frame, and placed in a hot press for hot pressing, demolding and curing to obtain particleboard; the hot pressing pressure is 4MPa, the hot pressing time is 8min, and the hot pressing temperature is 130℃.

[0081] Comparative Example 6

[0082] A high-strength flame-retardant particleboard is made from the following raw material components in parts by weight: 1000 parts particleboard and 150 parts composite adhesive. The composite adhesive is made from the following components in parts by weight: 65 parts modified soybean gum, 65 parts modified guar gum, 12 parts curing agent, and 8 parts halloysite nanotubes. The curing agent is a mixture of hydroxyethyl melamine and sodium tetraborate in a mass ratio of 2:1.

[0083] The modified soybean gum is prepared as follows: 8 parts by weight of soybean protein and 25 parts by weight are mixed and stirred for 20 minutes to obtain a soybean protein solution system; the system temperature is adjusted to 50℃, 4 parts by weight of polycaprolactam are added to the system and stirred for 50 minutes; the system pH is adjusted to 9 and stirred for 20 minutes; 0.6 parts by weight of ammonium persulfate are added to the system and stirred for 20 minutes; 3 parts by weight of caffeic acid are added to the system and stirred for 20 minutes to obtain the modified soybean gum.

[0084] The modified guar gum is prepared as follows: 80 parts by weight of water and 140 parts by weight of dimethylamine are mixed evenly, 80 parts by weight of guar gum powder are added, and the mixture is stirred for 1 hour. Then, 0.8 parts by weight of N-vinyl-2-pyrrolidone and 0.8 parts by weight of N-alkylsulfonated acrylamide are added, and the mixture is stirred for 20 minutes. Finally, 0.8 parts by weight of potassium persulfate are added, the reaction vessel is sealed, and the mixture is stirred for 36 hours to obtain the modified guar gum.

[0085] The preparation method of the high-strength flame-retardant particleboard is carried out according to the following steps:

[0086] (1) Preparation of wood shavings: The wood is peeled, sieved, and impurities are removed. The wood is then put into a pulverizer and processed into wood shavings to obtain wood shaving raw material. The wood shavings are 100 mm long, 30 mm wide, and 0.4 mm thick.

[0087] (2) Preparation of Glue-mixed wood shavings: Dry the wood shavings raw material, place it in a drum mixer, add modified soybean gum, modified guar gum and halloysite nanotubes, stir at 800 r / min for 2 h, add curing agent, stir at 1500 r / min for 2 min, and dry to a moisture content of 4 wt% to obtain Glue-mixed wood shavings.

[0088] (3) Preparation of particleboard: The glue-mixed wood chips are laid into a single layer of board blank, placed in a steel film frame, and placed in a hot press for hot pressing, demolding and curing to obtain particleboard; the hot pressing pressure is 4MPa, the hot pressing time is 8min, and the hot pressing temperature is 130℃.

[0089] Experimental example:

[0090] According to GB / T 17657-2022 "Test Methods for Physical and Chemical Properties of Wood-based Panels and Decorative Wood-based Panels", the internal bond strength (MPa) of the particleboard prepared in Examples 1-3 and Comparative Examples 1-2 was determined. The experimental results were statistically analyzed using SPSS 24.0 software. Quantitative data were analyzed using... (mean ± standard deviation) represents the mean. The Kolmogorov-Smirnov test was used to test the normality of the data. For normally distributed data, a t-test was used to compare the differences in means between two groups, with P < 0.05 considered statistically significant. The results are shown in Table 1.

[0091] Table 1

[0092]

[0093] Note: * indicates that compared with Example 1 group, P<0.05.

[0094] According to GB / T 17657-2022 "Test Methods for Physical and Chemical Properties of Wood-based Panels and Decorative Wood-based Panels", the static bending strength (MPa) of the particleboard prepared in Examples 1-3 and Comparative Examples 3-4 was determined. The experimental results were statistically analyzed using SPSS 24.0 software. Measurement data were analyzed using... (mean ± standard deviation) represents the mean. The Kolmogorov-Smirnov test was used to test the normality of the data. For normally distributed data, a t-test was used to compare the differences in means between two groups, with P < 0.05 considered statistically significant. The results are shown in Table 2.

[0095] Table 2

[0096]

[0097] Note: * indicates that compared with Example 2 group, P<0.05.

[0098] According to GB 8624-2012 "Classification of Burning Performance of Building Materials and Products", the burning performance ratings of the particleboard prepared in Examples 1-3 and Comparative Examples 5-6 were determined. The burning performance ratings of the particleboard in Examples 1-3 were all B1-C, and the burning performance ratings of the particleboard in Comparative Examples 5-6 were all B2-D.

[0099] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A high-strength flame-retardant particleboard, characterized in that, It is made from the following raw material components in parts by weight: 800-1200 parts wood shavings and 50-200 parts composite adhesive.

2. The high-strength flame-retardant particleboard according to claim 1, characterized in that, The composite adhesive is made of the following components in parts by weight: 20-80 parts modified soybean gum, 20-80 parts modified guar gum, 5-20 parts curing agent, and 5-10 parts flame retardant.

3. The high-strength flame-retardant particleboard according to claim 2, characterized in that, The modified soybean gum is prepared as follows: 5-10 parts by weight of soybean protein and 20-40 parts by weight are mixed and stirred for 15-30 minutes to obtain a soybean protein solution system; the system temperature is adjusted to 40-60℃, and 1-5 parts of polycaprolactam are added to the system and stirred for 30-60 minutes; the system pH is adjusted to 8-10 and stirred for 15-30 minutes; 0.2-1.5 parts of ammonium persulfate are added to the system and stirred for 15-30 minutes; 1-4 parts of caffeic acid are added to the system and stirred for 15-30 minutes to obtain the final product.

4. The high-strength flame-retardant particleboard according to claim 2, characterized in that, The modified guar gum is prepared as follows: 60-100 parts by weight of water and 120-180 parts by weight of dimethylamine are mixed evenly, 60-100 parts by weight of guar gum powder are added, and the mixture is stirred for 0.5-1.5 hours. Then, 0.5-1.2 parts by weight of N-vinyl-2-pyrrolidone and 0.5-1.2 parts by weight of N-alkylsulfonated acrylamide are added, and the mixture is stirred for 15-30 minutes. Finally, 0.5-1.2 parts by weight of potassium persulfate are added, the reaction vessel is sealed, and the mixture is stirred for 24-48 hours to obtain the modified guar gum.

5. The high-strength flame-retardant particleboard according to claim 2, characterized in that, The curing agent is a mixture of hydroxyethyl melamine and sodium tetraborate in a mass ratio of (1-3):

1.

6. The high-strength flame-retardant particleboard according to claim 2, characterized in that, The flame retardant is a mixture of urea phosphate and halloysite nanotubes in a mass ratio of (1-3):

1.

7. The method for preparing the high-strength flame-retardant particleboard according to claim 1, characterized in that, Follow these steps: (1) Preparation of wood shavings: The wood is peeled, sieved, and impurities are removed. The wood is then added to a pulverizer and processed into wood shavings to obtain wood shaving raw materials. (2) Preparation of glue-mixed wood shavings: Dry the wood shavings raw material, place them in a drum mixer, add modified soybean glue, modified guar gum and flame retardant, stir at 500-1000 r / min for 1-3 h, add curing agent, stir at 1000-2000 r / min for 1-3 min, dry to a moisture content of 2-6 wt%, and obtain glue-mixed wood shavings; (3) Preparation of particleboard: The glue-mixed wood chips are laid into a single layer of board blank, placed in a steel mold frame, and then placed in a hot press for hot pressing, demolding and curing to obtain particleboard.

8. The method for preparing high-strength flame-retardant particleboard according to claim 7, characterized in that, The wood shavings in step (1) are 80-160mm long, 20-60mm wide, and 0.3-0.6mm thick.

9. The method for preparing high-strength flame-retardant particleboard according to claim 7, characterized in that, The hot pressing pressure in step (3) is 3-6 MPa, the hot pressing time is 6-15 min, and the hot pressing temperature is 120-150℃.

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