Fireproof and moistureproof treatment method for high-density fiberboard

Abstract

The invention provides a fireproof and moistureproof treatment method for a high-density fiberboard, which belongs to the technical field of high-density fiberboards, adopts liquid paraffin as a flame-retardant impregnating medium, has the advantages of low water consumption, good flame-retardant effect and the like, can be reused, is low in cost and flame-retardant in the aspect of ecological environment, and the liquid paraffin has non-toxic property and is environment-friendly. The liquid paraffin is not mutually soluble with the flame retardant during dyeing, the flame-retardant impregnation waste liquid is easy to separate, almost no pollutant is discharged in the whole flame-retardant treatment process, the flame retardant is rapidly brought into the fiberboard through flame-retardant impregnation treatment, one drop of water is not needed in the whole process, the flame-retardant impregnation time is obviously shortened, zero discharge is realized, and the method is environment-friendly and efficient; moreover, residual paraffin after hot water washing still has certain moisture resistance, and further through a sodium methylsilanolate solution which has waterproof and covering effects, and a flame retardant composed of borax and N-hydroxymethyl-3-dimethoxyphosphoryl propionamide, the flame retardant effect is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of high-density fiberboards, in particular to a fireproof and moisture-proof treatment method for high-density fiberboards. Background Art

[0002] In the past, a large number of fiberboards produced in my country were used in a dry state, and were mainly used as thick boards, with poor moisture resistance and heavy weight. In the current fiberboard market, there are few fiberboard products that really focus on moisture resistance and environmental protection performance, and it is difficult to meet the demand for environmentally friendly building materials and flame-retardant building materials in furniture, interior decoration and decoration industries. In areas with humid climates such as the south and Southeast Asia, there is a huge market demand for waterproof, flame-retardant, and high-density fiberboards used in bathroom cabinets, dressing tables, PCB printed circuit boards, vehicle and ship manufacturing, high-end home appliances and bowling lanes in highly humid environments. However, the thickness of the thin fiberboard produced by the manufacturing method of JP2005288861A cosmetic material is 2 to 4 mm, which is still relatively thick and there is still a gap compared with the ultra-thin fiberboard of 1 mm. Similarly, the thickness of the wood wet-process ultra-thin hard fiberboard developed by the Tianjin Wood Industry Research Institute in China is 2 mm, but it is still relatively thick, not environmentally friendly and not waterproof. The complexity of the process and the cost make it impossible to prepare ultra-thin moisture-proof fiberboards, but the thickness limit of 1 mm is out of reach. Those skilled in the art are in urgent need of developing a fireproof and moisture-proof treatment method for high-density fiberboard to meet existing usage needs and performance requirements. Summary of the invention

[0003] In view of the above problems, the present invention aims to provide a fireproof and moisture-proof treatment method for high-density fiberboard.

[0004] The present invention is achieved through the following technical solutions: A fireproof and moisture-proof treatment method for high-density fiberboard comprises the following steps: the first step is to roll a 1mm thick high-density fiberboard into a fiberboard roll using a warp shaft of a roll-up machine; the fiberboard warp shaft roll is placed in a flame retardant impregnation kettle, a flame retardant and liquid paraffin are poured into the flame retardant impregnation kettle and stirred evenly, the amount of the flame retardant is 5-10% of the mass of the liquid paraffin, when the flame retardant impregnation is performed, the flame retardant impregnation bath ratio is 1:3-5, the temperature is raised from room temperature to 90-100°C at 3-5°C / min, the temperature is kept for 1-2h, the temperature is lowered to 90°C, taken out and washed; the second step is to dry the washed flame retardant impregnated fiberboard at 100-105°C for 10-15min, then the temperature is raised to 150-170°C and baked for 2-3min, and then 10-15g / m of water-soluble organic silicon solution is sprayed on the surface of the fiberboard. 2 Finally, it is air-dried in a constant temperature and humidity environment until the surface moisture content is 11-12%, thus obtaining a high-density fiberboard after fire and moisture-proof treatment.

[0005] Furthermore, the density of the 1 mm thick high-density fiberboard is 0.91 to 0.94 g / cm3 .

[0006] Furthermore, the flame retardant is a mixture of N-hydroxymethyl-3-dimethoxyphosphoryl propionamide and borax in a mass ratio of 1:1.

[0007] Furthermore, the first step of cleaning process conditions is hot water cleaning at a temperature of 80°C to 90°C.

[0008] Furthermore, the water-soluble organosilicon solution is a sodium methylsiliconate solution with a mass fraction of 10% to 15%.

[0009] Furthermore, the liquid paraffin has a normal alkane mass fraction of ≥96%.

[0010] Beneficial effects of the present invention: The fireproof and moisture-proof treatment method of the high-density fiberboard disclosed by the invention adopts liquid paraffin as the flame retardant impregnation medium, has the advantages of small water consumption, good flame retardant effect, etc., can be reused, low cost, and flame retardant in the ecological environment. The liquid paraffin has a non-toxic property, and the liquid paraffin dyeing is not miscible with the flame retardant, the flame retardant impregnation waste liquid is easy to separate, and the liquid paraffin can be reused for flame retardant treatment after recovery. There is almost no pollutant emission in the whole flame retardant treatment process, and the flame retardant is quickly brought into the fiberboard through the flame retardant impregnation treatment. The whole process does not use a drop of water, and the flame retardant impregnation time is significantly shortened, so as to achieve "zero" emission, environmental protection and high efficiency, and the paraffin remaining after hot water washing still has a certain moisture resistance, and further through the sodium methylsiliconate solution, it has waterproof and covering effects, effectively inhibits flaming combustion, slows down the spread of fire, reduces the smoke concentration and toxicity when the material is burned, and creates conditions for fire evacuation and escape. The flame retardant composed of borax and N-hydroxymethyl-3-dimethoxyphosphoryl propionamide has low cost and improves the flame retardant effect. The production process is easy to operate, environmentally friendly and ultra-thin, and can be applied to the lamination of flame-retardant veneer artificial board substrates. The veneer artificial board has high dimensional stability and better decorative effect, and has broad market prospects. DETAILED DESCRIPTION

[0011] The present invention is described below with specific examples, but is not intended to be limiting of the present invention. Example 1

[0012] Equipment and raw materials: Qingdao Jinhaiyuan Chemical 99.6% borax; Shanghai Qian 1mm thick high-density fiberboard has a density of 0.94g / cm 3 Liquid paraffin has a normal alkane mass fraction of ≥96%; Liside N-hydroxymethyl-3-dimethoxyphosphoryl propionamide; A fireproof and moisture-proof treatment method for high-density fiberboard comprises the following steps: the first step is to roll a 1mm thick high-density fiberboard into a fiberboard roll using a warp shaft of a roll-up machine; the fiberboard warp shaft roll is placed in a flame-retardant impregnation kettle, a flame retardant and liquid paraffin are poured into the flame-retardant impregnation kettle and stirred evenly, the amount of the flame retardant is 10% of the mass of the liquid paraffin, when the flame-retardant impregnation is performed, the flame-retardant impregnation bath ratio is 1:5, the temperature is increased from room temperature to 100°C at 5°C / min, the temperature is kept for 2h, the temperature is lowered to 90°C, and the fiberboard is taken out for cleaning, the flame retardant is a mixture of N-hydroxymethyl-3-dimethoxyphosphoryl propionamide and borax in a mass ratio of 1:1, and the cleaning process condition temperature is 90°C hot water for cleaning; the second step is to dry the cleaned flame retardant impregnated fiberboard at 105°C for 15min, then heat it to 170°C and bake it for 3min, and then spray 15g / m2 of water-soluble organic silicon solution on its surface. 2 After that, the water-soluble organic silicon solution is a 15% by mass sodium methylsiliconate solution, and then it is air-dried in a constant temperature and humidity environment to a surface moisture content of 12%, thus obtaining a high-density fiberboard after fire and moisture-proof treatment.

[0013] Product: Density 0.95g / cm 3 ; Density deviation within the board -1.9,1.5%; Moisture content 12%; Static bending strength 50.9MPa; Elastic modulus 4858MPa; Internal bonding strength 1.71MPa; Surface bonding strength 2.38MPa; Water absorption thickness expansion rate 21.0%; Water absorption rate 45.0%. Flame retardant B1-B grade, oxygen index 38.9%. Example 2

[0014] Equipment and raw materials: 99.6% borax from Chuandong Chemical; the density of 1mm thick high-density fiberboard from Shanghai Qian is 0.91g / cm 3 . Jinyuan Petrochemical liquid paraffin with a normal alkane mass fraction of ≥98%; N-hydroxymethyl-3-dimethoxyphosphoryl propionamide pyrovatex CP.

[0015] A fireproof and moisture-proof treatment method for high-density fiberboard comprises the following steps: the first step is to roll a 1mm thick high-density fiberboard into a fiberboard roll using a warp shaft of a roll-up machine; the fiberboard warp shaft roll is placed in a flame-retardant impregnation kettle, a flame retardant and liquid paraffin are poured into the flame-retardant impregnation kettle and stirred evenly, the amount of the flame retardant is 5% of the mass of the liquid paraffin, when the flame-retardant impregnation is performed, the flame-retardant impregnation bath ratio is 1:3, the temperature is increased from room temperature to 90°C at 3°C / min, the temperature is kept for 1h, the temperature is lowered to 90°C, and the fiberboard is taken out for cleaning, the flame retardant is a mixture of N-hydroxymethyl-3-dimethoxyphosphoryl propionamide and borax in a mass ratio of 1:1, and the cleaning process condition temperature is 80°C hot water for cleaning; the second step is to dry the cleaned flame retardant impregnated fiberboard at 100°C for 10min, then heat it to 150°C and bake it for 2min, and then spray 10g / m2 of water-soluble organic silicon solution on its surface. 2Finally, the water-soluble organic silicon solution is a 10% by mass sodium methylsiliconate solution, and then it is air-dried in a constant temperature and humidity environment to a surface moisture content of 11%, thereby obtaining a high-density fiberboard after fire and moisture-proof treatment.

[0016] Product: Density 0.94g / cm 3 ; Density deviation within the board -1.8,1.4%; Moisture content 4.5%; Static bending strength 50.4MPa; Elastic modulus 4798MPa; Internal bonding strength 1.67MPa; Surface bonding strength 2.33MPa; Water absorption thickness expansion rate 21.0%; Water absorption rate 45.8%. Flame retardant B1-B grade, oxygen index 38.5%.

[0017] Note: The moisture content is determined according to the moisture content determination method specified in 4.3 of GB / T17657-2013. The static bending strength and elastic modulus are determined according to the static bending strength and elastic modulus determination methods specified in 4.7 of GB / T17657-2013, and the specimen is balanced. If the specimen is not damaged, the maximum load is taken as Fmax for static bending strength calculation. The internal bonding strength is determined according to the internal bonding (bonding) strength determination method specified in 4.11 of GB / T17657-2013, and the specimen is balanced. The surface bonding strength is determined according to the test method specified in 6.9 of GB / T11718-2021, and the specimen is balanced. The water absorption thickness expansion rate is determined according to the water absorption expansion rate determination method 1 specified in 4.4 of GB / T17657-2013, and the immersion time is required to be 24h±5min, and the measurement after immersion is completed within 10min. The water absorption rate is determined according to the 24h water absorption rate determination method specified in 4.6 of GB / T17657-2013. The formaldehyde emission is determined according to the formaldehyde emission determination provisions in GB18580-2017. The combustion performance classification is determined according to the criteria specified in Chapter 5 of GB8624-2012, and the classification and identification is carried out according to Chapter 6 and Appendix B of GB8624-2012. The oxygen index is determined according to the method specified in GB / T2406.2-2009.

Claims

1. A fireproof and moisture-proof treatment method for high-density fiberboard, characterized in that: The following steps are involved: The first step is to roll a 1mm thick high-density fiberboard into a fiberboard roll using a warp beam of a winding machine; place the fiberboard warp beam in a flame retardant impregnation kettle, pour the flame retardant and liquid paraffin into the flame retardant impregnation kettle and stir evenly. The amount of flame retardant is 5-10% of the mass of liquid paraffin. When performing flame retardant impregnation, the flame retardant impregnation bath ratio is 1:3-5, and the temperature is increased from room temperature to 90-100°C at 3-5°C / min, kept warm for 1-2h, cooled to 90°C, taken out and cleaned; the second step is to dry the cleaned flame retardant impregnated fiberboard at 100-105°C for 10-15min, then heat it to 150-170°C and bake it for 2-3min, and then spray 10-15g / m of water-soluble silicone solution on its surface. 2 Finally, it is air-dried in a constant temperature and humidity environment until the surface moisture content is 11-12%, thus obtaining a high-density fiberboard after fire and moisture-proof treatment.

2. The fireproof and moisture-proof treatment method of high-density fiberboard according to claim 1, characterized in that: The density of the 1 mm thick high-density fiberboard is 0.91 to 0.94 g / cm 3 .

3. The fireproof and moisture-proof treatment method of high-density fiberboard according to claim 1, characterized in that: The flame retardant is a mixture of N-hydroxymethyl-3-dimethoxyphosphoryl propionamide and borax in a mass ratio of 1:

1.

4. The fireproof and moisture-proof treatment method of high-density fiberboard according to claim 1, characterized in that: The first step of cleaning process conditions is hot water cleaning at a temperature of 80°C to 90°C.

5. The fireproof and moisture-proof treatment method of high-density fiberboard according to claim 1, characterized in that: The water-soluble organic silicon solution is a sodium methylsiliconate solution with a mass fraction of 10% to 15%.

6. The fireproof and moisture-proof treatment method of high-density fiberboard according to claim 1, characterized in that: The liquid paraffin has a normal alkane mass fraction of ≥96%.