Flame-retardant early-warning solid wood board and preparation method thereof

Abstract

In order to overcome the flammable disadvantage of wood materials, improve the safe use performance of the wood materials and reduce the use of petrochemical-based flame retardants, a solid wood board can be subjected to dipping flame-retardant treatment by preparing a bio-based flame retardant, forming a nitrogen-phosphorus metal series synergistic flame-retardant system and brushing a photocureable coating added with metal ions. The high-efficiency functional wood material with flame-retardant and early-warning functions is prepared.

Description

Technical Field

[0001] The present invention belongs to the field of flame retardant warning, and specifically relates to a method for preparing a bio-based flame retardant, a flame retardant warning photocuring coating, and a modified solid wood board. Technical Background

[0002] Fire poses a great threat to human life and property safety. From ancient times to the present, there have been countless casualties caused by fire. The threat of fire must be prevented.

[0003] Wood is widely used in various fields of human production and life due to its light weight and high strength. However, one of the major disadvantages of wood is that it is flammable. The same is true for all kinds of wood materials such as solid wood boards. If they are not treated with flame retardants and encounter fire, the fire loss may increase. There have been studies on fire prevention for a long time. By treating combustible materials by impregnating them in flame retardants, using surface coatings, or directly grafting flame retardant elements and effective components into the molecular chains of polymers, thereby modifying them into flame retardant materials, and replacing combustible materials with flame retardant materials is a common way to prevent fires.

[0004] Bio-based flame retardant is the use of various renewable raw materials to prepare flame retardants or flame retardant treatment. Commonly used bio-based materials such as phytic acid, chitosan, citric acid, etc. are used to modify animal and plant extracts to form a bio-based flame retardant system. Bio-based flame retardant systems are relatively more environmentally friendly. At the same time, some flame retardants modified by bio-based will have better interfacial compatibility. The development of bio-based flame retardants is one of the current research hotspots. However, this method of only modifying the flame retardant of combustible materials and replacing the combustible materials with flame retardant materials is relatively passive, relying on the flame retardant materials to self-extinguish or slow down the combustion rate to reduce losses. Therefore, the application of flame retardant warning treatment on solid wood boards and various combustible and flammable materials is extremely important and critical.

[0005] In order to solve the problem of flammability of solid wood boards and prevent problems before they occur, we can formulate bio-based flame retardants to form a nitrogen-phosphorus-metal synergistic flame retardant system, impregnate solid wood boards with flame retardant treatment, and apply light-curing coatings with metal ions to generate voltage for early warning when heated. Solid wood boards treated with these two methods can protect the substrate in high temperature environments and send out early warning signals for a long time. Summary of the invention

[0006] The technical problem solved by the present invention is to provide a method for preparing a flame retardant warning solid wood board, which uses a solid wood board as a substrate, soaks the substrate in a flame retardant, dries it, and applies a flame retardant warning light-cured coating to finally prepare a flame retardant warning solid wood board. The method can also be used for other types of man-made boards, such as fiberboard, plywood, particleboard, blockboard, etc., and can also be used for decorative paper such as impregnated paper, and can effectively provide flame retardant warning performance.

[0007] The technical problem solved by the present invention is achieved by adopting the following technical solutions:

[0008] A method for preparing a flame retardant early warning solid wood board comprises the following steps:

[0009] (1) Preparation of bio-based flame retardant: phytic acid and hydrolyzed collagen are mixed in a certain ratio and fully hydrolyzed to prepare a bio-based flame retardant;

[0010] (2) Preparation of flame retardant warning coating: Phytic acid and ferroferric oxide are completely reacted under heating conditions to generate phytic acid iron; phytic acid iron and montmorillonite are heated and mixed in a certain proportion; polyurethane acrylate, tripropylene glycol diacrylate, trimethylbenzoyl diphenylphosphine oxide, 1-hydroxycyclohexyl phenyl ketone, phytic acid iron and montmorillonite mixed solution are mixed in a certain proportion, and stirred thoroughly to obtain a light-cured flame retardant warning coating;

[0011] (3) Flame retardant warning treatment of solid wood boards: clean wood materials with a moisture content of less than 5% after drying are subjected to a two-stage treatment of impregnation and coating; first, the wood materials are immersed in a bio-based flame retardant for a period of time, then taken out and dried in an oven; the flame retardant warning coating is evenly applied to the solid wood, and then irradiated under ultraviolet light until it is completely dry, thereby obtaining a flame retardant warning modified solid wood board;

[0012] To ensure the excellent performance of the sample, preferably, in the preparation of the bio-based flame retardant in step (1), the concentration of phytic acid is 50%, and the mass ratio of phytic acid to hydrolyzed collagen is 5:1;

[0013] Preferably, the standard for sufficient hydrolysis in the preparation of the bio-based flame retardant in step (1) is that the solution is clear and transparent, without foam and undissolved powder;

[0014] Preferably, in the preparation of the flame retardant warning coating in step (2), the concentration of phytic acid is 50%, and the amount of ferroferric oxide added is 0.5 g ferroferric oxide per 100 ml phytic acid;

[0015] Preferably, in the preparation of the flame retardant warning coating in step (2), the heating condition of phytic acid and ferrosoferric oxide is 80° C.;

[0016] Preferably, in the preparation of the flame retardant warning coating in step (2), the standard for the complete reaction of phytic acid and ferrosoferric oxide is that the solution is clear and there is no unreacted black powder;

[0017] Preferably, in the preparation of the flame retardant warning coating in step (2), the ratio of phytic acid iron to montmorillonite is 3:1, and the heating condition is 60°C-90°C;

[0018] Preferably, in the preparation of the flame retardant warning coating in the above step (2), the ratio of polyurethane acrylate, tripropylene glycol diacrylate, trimethylbenzoyl diphenyl phosphine oxide, 1-hydroxycyclohexyl phenyl ketone, phytic acid iron and montmorillonite mixed solution is as follows: polyurethane acrylate 75%, tripropylene glycol diacrylate 6%, trimethylbenzoyl diphenyl phosphine oxide 2%, 1-hydroxycyclohexyl phenyl ketone 2%, phytic acid iron and montmorillonite mixed solution 15%;

[0019] Preferably, the wood material in the flame retardant warning treatment of the solid wood board in step (3) above can be a solid wood board of poplar, pine, elm or the like;

[0020] Preferably, in the step (3) of the solid wood board flame retardant early warning treatment, the solid wood board is immersed in the bio-based flame retardant for 5 minutes and the drying temperature is 60° C.;

[0021] Preferably, the thickness of the flame retardant warning light-cured coating applied in the flame retardant warning treatment of the solid wood board in step (3) is 200±30 μm;

[0022] Preferably, in the above step (3) of flame retardant early warning treatment of solid wood board, the wavelength of ultraviolet lamp is 365nm, and the irradiation time is 5s.

[0023] Specific implementation cases

[0024] In order to better illustrate the technical means and preparation process of the present invention, the present invention is explained below in conjunction with specific implementation cases.

[0025] Example 1

[0026] Prepare bio-based flame retardant according to the mass ratio of phytic acid: hydrolyzed collagen 5:1, take 200g of 50% phytic acid solution and 40g of hydrolyzed collagen, stir appropriately after mixing, and let stand at room temperature for 12 hours until the mixed solution is clear and free of impurities. Take 300ml of 50% phytic acid solution and 1.5g of ferroferric oxide powder, heat the phytic acid to 80℃ in a condensation reflux device, add ferroferric oxide three times, react until the solution is clear and free of black powder, and take it out for use. Prepare a mixed solution according to the mass ratio of phytic acid iron: montmorillonite 3:1, take 3g of phytic acid iron solution and 1g of montmorillonite powder, and stir evenly at 80℃. Prepare 5g of flame retardant warning coating according to the ratio of 75% polyurethane acrylate, 6% tripropylene glycol diacrylate, 2% trimethylbenzoyl diphenyl phosphine oxide, 2% 1-hydroxycyclohexyl phenyl ketone, and 15% of phytic acid iron and montmorillonite mixed solution. Take 3.75g polyurethane acrylate, 3g tripropylene glycol diacrylate, 1g trimethylbenzoyl diphenyl phosphine oxide, 1g 1-hydroxycyclohexyl phenyl ketone, 0.75g of phytic acid iron and montmorillonite mixed solution. First, dissolve trimethylbenzoyl diphenyl phosphine oxide and 1-hydroxycyclohexyl phenyl ketone powder in tripropylene glycol diacrylate, add other components in turn, stir evenly for use. Take a poplar board with a moisture content of less than 5% after drying and immerse it in the bio-based flame retardant for 5 minutes. After removing the excess flame retardant, put it in a 60℃ oven and dry it until the moisture content is less than 5%. Apply the flame retardant warning coating evenly on the surface of the poplar board after flame retardant treatment, and control the coating thickness to 200±30μm. The evenly coated poplar board was placed under a 365nm ultraviolet lamp for 5s, and a flame retardant warning poplar board was obtained after the light curing was completed.

[0027] The above describes the basic principle, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements fall within the scope of the protection required. The scope of protection required by the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for preparing a flame retardant warning solid wood board, comprising the following steps: (1) Preparation of bio-based flame retardant: phytic acid and hydrolyzed collagen are mixed in a certain ratio and fully hydrolyzed to prepare a bio-based flame retardant; (2) Preparation of flame retardant warning coating: Phytic acid and ferroferric oxide are completely reacted under heating conditions to generate phytic acid iron; phytic acid iron and montmorillonite are heated and mixed in a certain proportion; polyurethane acrylate, tripropylene glycol diacrylate, trimethylbenzoyl diphenylphosphine oxide, 1-hydroxycyclohexyl phenyl ketone, phytic acid iron and montmorillonite mixed solution are mixed in a certain proportion, and stirred thoroughly to obtain a light-cured flame retardant warning coating; (3) Flame retardant warning treatment of solid wood boards: clean wood materials with a moisture content of less than 5% after drying are subjected to a two-stage treatment of impregnation and coating; first, the wood materials are immersed in a bio-based flame retardant for a period of time, then taken out and dried in an oven; the flame retardant warning coating is evenly applied to the solid wood, and then irradiated under ultraviolet light until it is completely dry, thereby obtaining a flame retardant warning modified solid wood board; To ensure the excellent performance of the sample, preferably, in the preparation of the bio-based flame retardant in the above step (1), the concentration of phytic acid is 50%, and the mass ratio of phytic acid to hydrolyzed collagen is 5:1; Preferably, the standard for sufficient hydrolysis in the preparation of the bio-based flame retardant in step (1) is that the solution is clear and transparent, without foam and undissolved powder; Preferably, in the preparation of the flame retardant warning coating in step (2), the concentration of phytic acid is 50%, and the amount of ferroferric oxide added is 0.5 g ferroferric oxide per 100 ml phytic acid; Preferably, in the preparation of the flame retardant warning coating in step (2), the heating condition of phytic acid and ferrosoferric oxide is 80° C.; Preferably, in the preparation of the flame retardant warning coating in step (2), the standard for the complete reaction of phytic acid and ferrosoferric oxide is that the solution is clear and there is no unreacted black powder; Preferably, in the preparation of the flame retardant warning coating in step (2), the ratio of phytic acid iron to montmorillonite is 3:1, and the heating condition is 60°C-90°C; Preferably, in the preparation of the flame retardant warning coating in the above step (2), the ratio of polyurethane acrylate, tripropylene glycol diacrylate, trimethylbenzoyl diphenyl phosphine oxide, 1-hydroxycyclohexyl phenyl ketone, phytic acid iron and montmorillonite mixed solution is as follows: polyurethane acrylate 75%, tripropylene glycol diacrylate 6%, trimethylbenzoyl diphenyl phosphine oxide 2%, 1-hydroxycyclohexyl phenyl ketone 2%, phytic acid iron and montmorillonite mixed solution 15%; Preferably, the wood material in the flame retardant warning treatment of the solid wood board in step (3) above can be a solid wood board of poplar, pine, elm or the like; Preferably, in the step (3) of the solid wood board flame retardant early warning treatment, the solid wood board is immersed in the bio-based flame retardant for 5 minutes and the drying temperature is 60° C.; Preferably, the thickness of the flame retardant warning light-cured coating applied in the flame retardant warning treatment of the solid wood board in step (3) is 200±30 μm; Preferably, in the above step (3) of flame retardant early warning treatment of solid wood board, the wavelength of ultraviolet lamp is 365nm, and the irradiation time is 5s.