Loss resistance and chemical stability of wood flame retardant WFR_(J1)

Loss-resistance and Chemical Stability of Wood Fire Retardant WFRp Liu Weiming (Luhe Forestry Bureau, Heilongjiang Province) Fang Guizhen Pang Jiujun Yu Jing Jin Zhongling (Northeast Forestry University, Harbin 150040) P and the resistance to WFR being the resistance of the timber of Populus euphratica Fuel treatment effect. The results of the study show that WFR is a good wood flame retardant.

And compound with water-soluble resin. It can greatly improve the resistance to loss of treated wood and the qualitative properties of chemical spikes. It enhances the volume and the quality of chemically modified wood, as well as its anti-corrosion and anti-corrosion properties. Compounding agents provide comprehensive functional improvements to the quality of treated wood.

The fast-growing tree species, Populus simonii, was used as a sample. The flame-retardant WFRn modified wood made by Northeast Forestry University was used to modify the wood and was treated with a low-molecular-weight water-soluble resin to improve the leaching resistance of the flame retardant. Chemical stability will play an important role in making full use of fast-growing forest resources, saving wood, increasing the added value of wood products, and alleviating the increasingly tense forest resource crisis.

1 Experimental method Maoershan Experimental Forest Farm, Northeast Forestry University. WFR, wood flame retardant is synthesized by water-soluble low-molecular-weight resin prepared by East:Linye University, see [1]. After synthesis, it is mixed with different concentrations of resin solution, and then added to WFRK according to different proportions. The sample is treated with vacuum one. Pressurization method, see 〔2〕 Determination of oxygen index according to GB8624-91 method, using the top ignition method. The flame retardancy test of construction materials was entrusted with the state's fixed fire extinguishing system and the quality supervision, inspection and testing of refractory components. Part 1: Fang Guizhen, female, born in March 1954, Northeast Forestry University. Professor, -88 Toe, Flame Retardant Treated Wood Loss Resistance and Chemical Stability Test Specimen Size (radial x chordwise x length) 20mm x 20mm x 10mm; hot and cold water, and 1% NaOH extract and benzene-ethanol For the determination method of extract content, please refer to [4], 2 Results and Discussion 2.1 Flame Retardant Wood's Oxygen Index WFR Water-soluble flame retardant, using room-temperature impregnated wood sample, the measured oxygen index of the sample is shown in table K mass fraction 15% of the flame retardant WFR, and the low molecular weight resin PF compounded to deal with the oxygen index of the wood of Populus euphratica as shown in Table 2.-95 stipulates that the wood materials in certain parts of the building must meet the flame retardant B1 level of the building materials (detection Method according to GB8625-88), but the test needs to be tested at the national designated testing center. The cost is high and the amount of sample to be measured is larger. This study uses the oxygen index to measure the flame retardant effect of treated wood. Oxygen index method has good comparability with the test results of Class B1. The higher the oxygen index, the stronger the flame retardant performance of the material, and the one-oxygen index can reach more than 50%. The plate can be tested at the B1 level. The oxygen index of wood of Populus euphratica is 17%. When WFR, the mass fraction reaches 10%, the oxygen index of wood of Populus euphratica after flame retardant treatment can exceed 50%. Table 2 Compound treatment Fuel WFRn treatment Populus grandiflora wood oxygen index determination PF mass fraction Inspiratory rate Oxygen index Absorption rate Oxygen index material 2.2 Building material flame retardancy test Flame retardancy test in order to improve the volume stability and physical and mechanical properties of flame-retardant treated wood Agent WFR water-soluble low-molecular-weight resin composite treatment of Populus euphratica wood can be seen from Table 2: Composite treatment of wood fire-retardant properties without adverse effects, but the resin mass fraction is too high when the impact of flame retardant absorption, so that a slight flame-retardant properties decline.

Using flame retardant and water-soluble low-molecular-weight resin to treat the Populus euphratica Oliv. Wood, on the basis of achieving 30% higher compressive strength and improved hardness on the basis of the H part, the tearing and flame retardancy of the treated wood was tested. The test results are shown in the table. 3. Comprehensive functions to improve the detection of flame retardancy of building materials of the large Qingyang timber ship, B1 indicators Table 3 Test results of the flame retardancy of the building materials Test items Standard Article number and standard requirements Test results Conclusion 1 Test for elegance and appraisal GB/T 8658- 88. It is not allowed to have a low-flammable ignition filter paper. The flame tip does not reach the mark within 2 s. No low-kilogram material is acceptable. K: The average value/mm The qualified T smoke temperature/Syed smoke density level (SDR) pass judgment Eligible for the use of flame retardant as a "residue for the emission of 2.3% of the sister-inhibitor." See the results of the determination of the resistance to loss of the wood of Populus euphratica in combination with the low-molecular-weight PF resin. Only the WFR, the flame-retardant wood, was extracted by cold water. At 12d, the WflR content was 12.5%B and the attrition loss rate was over 11%. The loss of flame retardant was greater, but the loss of treating agent was similar to that of the wood treated with WFb and low molecular M resin. About 3%, its loss resistance The results of hot water extraction experiments obtained by the hot water extraction experiment similar to that of the cold water show that: WFR, I have certain resistance to churn, However, it is weak, and it is not suitable for use in rooms or humid environments, but the method of compounding with water-soluble molecular resins not only enhances the flame-retardant WFR, but also increases the range of use, and it is also large. The flame retardancy of poplar wood has no effect, VFRK15%) and different mass fractions of PF deal with the change of cold water extract content of Populus euphratica wood. VFRK 15%) and different mass fractions of PF in the treatment of extracts from hot water extracts of Populus euphratica wood 2.4 Chemical stability of flame retardants In order to use modified wood in harsh environments, inorganic acids, alkalis and organics were used in this study. The solvent acts on the modified wood, and improves the weather resistance of the flame retardant through compounding treatment. The flame retardant deuterium-enriched water-soluble low-molecular-resin composite treatment of the chemical stability of the Populus euphratica wood Qualitative measurement results can be seen in 0. Large reductions in resistance to acids, bases, and organic solvents increase, their chemical stability is greatly improved, and thus the weatherability of treated wood is also enhanced, and the modified wood can be treated in acid rain and alkali. Used in an environmental environment, with anti-corrosion and anti-insect properties, can be used in outdoor building materials. 0 6 12 18 24 24 time A different quality fractions WFR, change of benzene-ethanol extract content in treated Populus euphratica wood different content WFR, change of HC1 extract content of treated Populus euphratica wood time / h WFRUS%) and The content of benzene-ethanol extracts in different Populus euphratica woods treated with different mass fractions of PF was varied by WFR, the content of l%NaOH extracts from treated Populus euphratica wood was changed by 1 hour, and VFRK15%) and different mass fractions of PF were used to treat Populus euphratica The change of l% NaOH extract content of wood can be seen from the experimental results: only the flame retardant wood treated with WFRn, under the action of acid, alkali and organic solvents, the loss rate is high, and the chemical stability is poor, while the use of WFR, and Low molecular weight resin composite treatment of wood, at the same time, the loss rate of treatment agent 0VFRK15%) and different mass fractions of PF treatment of poplar wood HC1 extract content changes 3 conclusions and recommendations WFR, is a better performance resistance The flame retardant properties of wood are not adversely affected by the combination of fuels and low molecular weight resins. WFR and low molecular weight resins are used to treat wood with a large degree of resistance to leaching and chemical stability. . The compounding agent enhances the volume stability, anti-corrosion performance and mechanical strength of the modified wood, so that the quality of the wood is comprehensively improved.