Augurman is a coumea of ​​the Burseraceae family, with a dry density of 0.43g cm3, moderate hardness and toughness. The wood has a smooth cut surface, dry shrinkage, and excellent processing, gluing and paint properties.
Rotary-cut veneer structure is uniform, material tone and rotary-cut veneer are mostly used to make plywood [1]. In recent years, the world's plywood companies have increased their use of imported Oguman logs from Gabon.
According to the relevant national industry regulations, plywood used in building decoration is classified as B2 flammable wood material (GB862 6) [2], which must be fire-retardant in order to be used in decoration and decoration. This experiment is under laboratory conditions. Preliminary study on the production process of flame retardant Oguman plywood.
1 Flame retardant Oguman plywood manufacturing process route and detection method
1 . 1 route
In addition to all the properties of general plywood, flame retardant plywood should also have certain flame retardant properties, and flame retardant properties are important characteristics of flame retardant plywood. Generally, flame retardant treatment methods for flame retardant plywood mainly include chemical treatment and physical treatment. The experiment adopts: Firstly, the Oguman veneer is flame-retarded in the manufacturing process of Oguman plywood, and then the flame-retardant adhesive is used as the glue to produce the flame-retardant Oguman plywood; The finished man-made plywood is flame retarded to give it a flame retardant property. Its production process route is:
(1) Flame retardant treatment process route
Veneer veneer flame retardant treatment
Flame retardant modulation
Flame retardant veneer dry coating
Flame retardant adhesive modulation
Group blank hot-press sawing sanding finished product
(2) Flame retardant treatment process of sheet metal
Plywood finished flame retardant treatment
Flame retardant modulation
Dry sanding finished product
1 2 hot pressing process parameters
Hot pressing 3 elements (temperature, pressure, time) are the main parameters of the plywood hot pressing process, which directly affect the quality and strength of the product. Oguman is a softer wood. During hot pressing, the hot pressing pressure should not be too large, and the hot pressing time should not be too long. At the same time, in order to ensure the flame retarding effect, the hot pressing temperature should not be too high. The process parameters used in this test are: hot pressing temperature: 1 0 5 ± 5 ° C; hot pressing time: 0.9 min mm; unit pressure: 0.8 to 1.0 MPa.
1. 3 Detection method
1 . 3 . 1 Flame retardant testing
The oxygen index is the main indicator for evaluating flame retardancy. So far, there is no uniform standard for the flame retardant plywood performance test method of Chinese enterprises. In this experiment, the oxygen index value is measured by the oxygen index test method of the national standard for plastic decorative plates (GB2 40 6-80).
1 . 3 . 2 Main physical and mechanical properties test
The main physical and mechanical properties of flame retardant Oguman plywood, according to the method specified in Class II plywood of GB9846-88, the physical and mechanical properties such as bonding strength and water content were tested.
2 Flame retardant treatment results
2 . 1 board flame retardant treatment
The flame retardant treatment of the board is carried out by veneer treatment, then the flame retardant adhesive is used for gluing and the veneer is not treated. Only the flame retardant adhesive is used for gluing. The oxygen index value, the bonding strength value and the water content value were measured after the board was formed, and the results are shown in Table 1.
Table 1 Performance of the board under different flame retardant treatment conditions
Flame Retardant Treatment Process Condition Oxygen Index (%) Glue Strength (MPa) Moisture Content (%)
Veneer flame retardant treatment of flame retardant urea-formaldehyde resin 40. 60 . 94 1 3 . 0
Veneer-free flame retardant urea-formaldehyde resin adhesive 3 3 . 2 1 . 0 2 1 2 . 6
The veneer is not flame retardant treated urea-formaldehyde resin glue 2 8. 5 1 . 0 8 1 3 . 2
2 . 2 sheet flame retardant treatment
Ordinary Oguman bonded sheets were fire-retardant treated, and the treated flame retardant sheets were measured for oxygen index, bonding strength and water content. The results were as follows: Oxygen index value of 3. 5.5%, gluing strength of 1.08 MPa, moisture content value It is 12.8%.
It can be seen from the above test that both process routes can achieve the purpose of flame retardant, and the bonding strength and water content can meet the requirements of the national standard of ordinary plywood.
3 Conclusions and recommendations
(1) A method of forming a plywood by adding a flame retardant adhesive to a veneer impregnated with a veneer is better than a flame retardant of a plywood impregnated with a finished plywood.
(2) Under laboratory conditions, the flame retardant Oguman plywood production process is feasible, and its main physical and mechanical properties have reached national standards.
(3) In the future, the flame retardant impregnating solution should be further developed to make the flame retardant effect of the flame retardant Oguman plywood better (the oxygen index value is higher).
(4) The anti-leak performance and paint performance of flame-retardant Oguman plywood are yet to be further studied in the future.
Rotary-cut veneer structure is uniform, material tone and rotary-cut veneer are mostly used to make plywood [1]. In recent years, the world's plywood companies have increased their use of imported Oguman logs from Gabon.
According to the relevant national industry regulations, plywood used in building decoration is classified as B2 flammable wood material (GB862 6) [2], which must be fire-retardant in order to be used in decoration and decoration. This experiment is under laboratory conditions. Preliminary study on the production process of flame retardant Oguman plywood.
1 Flame retardant Oguman plywood manufacturing process route and detection method
1 . 1 route
In addition to all the properties of general plywood, flame retardant plywood should also have certain flame retardant properties, and flame retardant properties are important characteristics of flame retardant plywood. Generally, flame retardant treatment methods for flame retardant plywood mainly include chemical treatment and physical treatment. The experiment adopts: Firstly, the Oguman veneer is flame-retarded in the manufacturing process of Oguman plywood, and then the flame-retardant adhesive is used as the glue to produce the flame-retardant Oguman plywood; The finished man-made plywood is flame retarded to give it a flame retardant property. Its production process route is:
(1) Flame retardant treatment process route
Veneer veneer flame retardant treatment
Flame retardant modulation
Flame retardant veneer dry coating
Flame retardant adhesive modulation
Group blank hot-press sawing sanding finished product
(2) Flame retardant treatment process of sheet metal
Plywood finished flame retardant treatment
Flame retardant modulation
Dry sanding finished product
1 2 hot pressing process parameters
Hot pressing 3 elements (temperature, pressure, time) are the main parameters of the plywood hot pressing process, which directly affect the quality and strength of the product. Oguman is a softer wood. During hot pressing, the hot pressing pressure should not be too large, and the hot pressing time should not be too long. At the same time, in order to ensure the flame retarding effect, the hot pressing temperature should not be too high. The process parameters used in this test are: hot pressing temperature: 1 0 5 ± 5 ° C; hot pressing time: 0.9 min mm; unit pressure: 0.8 to 1.0 MPa.
1. 3 Detection method
1 . 3 . 1 Flame retardant testing
The oxygen index is the main indicator for evaluating flame retardancy. So far, there is no uniform standard for the flame retardant plywood performance test method of Chinese enterprises. In this experiment, the oxygen index value is measured by the oxygen index test method of the national standard for plastic decorative plates (GB2 40 6-80).
1 . 3 . 2 Main physical and mechanical properties test
The main physical and mechanical properties of flame retardant Oguman plywood, according to the method specified in Class II plywood of GB9846-88, the physical and mechanical properties such as bonding strength and water content were tested.
2 Flame retardant treatment results
2 . 1 board flame retardant treatment
The flame retardant treatment of the board is carried out by veneer treatment, then the flame retardant adhesive is used for gluing and the veneer is not treated. Only the flame retardant adhesive is used for gluing. The oxygen index value, the bonding strength value and the water content value were measured after the board was formed, and the results are shown in Table 1.
Table 1 Performance of the board under different flame retardant treatment conditions
Flame Retardant Treatment Process Condition Oxygen Index (%) Glue Strength (MPa) Moisture Content (%)
Veneer flame retardant treatment of flame retardant urea-formaldehyde resin 40. 60 . 94 1 3 . 0
Veneer-free flame retardant urea-formaldehyde resin adhesive 3 3 . 2 1 . 0 2 1 2 . 6
The veneer is not flame retardant treated urea-formaldehyde resin glue 2 8. 5 1 . 0 8 1 3 . 2
2 . 2 sheet flame retardant treatment
Ordinary Oguman bonded sheets were fire-retardant treated, and the treated flame retardant sheets were measured for oxygen index, bonding strength and water content. The results were as follows: Oxygen index value of 3. 5.5%, gluing strength of 1.08 MPa, moisture content value It is 12.8%.
It can be seen from the above test that both process routes can achieve the purpose of flame retardant, and the bonding strength and water content can meet the requirements of the national standard of ordinary plywood.
3 Conclusions and recommendations
(1) A method of forming a plywood by adding a flame retardant adhesive to a veneer impregnated with a veneer is better than a flame retardant of a plywood impregnated with a finished plywood.
(2) Under laboratory conditions, the flame retardant Oguman plywood production process is feasible, and its main physical and mechanical properties have reached national standards.
(3) In the future, the flame retardant impregnating solution should be further developed to make the flame retardant effect of the flame retardant Oguman plywood better (the oxygen index value is higher).
(4) The anti-leak performance and paint performance of flame-retardant Oguman plywood are yet to be further studied in the future.
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