Preparation method of flame-retardant 3D printing wood dust material
A 3D printing and flame-retardant technology, which is applied in the field of polymer chemical materials, can solve the problems affecting the application of wood, poor mechanical strength, and flammability of wood, and achieve the effect of not easy biological adhesion, high mechanical strength, and changing the properties of wood
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[0019] Example 1
[0020] A preparation method of 3D printing wood chip material, the specific steps are as follows:
[0021] 1. Put ordinary sawdust with a particle size of less than 1mmX1mmX1mm into the reactor, add benzene solvent to completely immerse it for 15min, steam dry at 120°C, and vacuum to 100Pa to obtain sawdust with a moisture content of 7-12%;
[0022] 2. Use acetic anhydride to immerse the wood chips obtained in step 1, add 40% acetic anhydride, benzene as the solvent, pressurize to 1MPa, react at 130°C for 8h, release the pressure, unload the acetic anhydride, and vacuum to 100Pa to obtain The water content is 5-8% wood chips.
[0023] 3. Add benzene, KD-2 flame retardant, polyacrylonitrile-based carbon fiber and trimethylolpropane tris(3-aziridinyl propionate) binding agent to the wood chips obtained in step 2, at 100℃~ Mix and stir at 120°C to obtain flame-retardant 3D printed wood chip material.
Example Embodiment
[0024] Example 2
[0025] A preparation method of 3D printing wood chip material, the specific steps are as follows:
[0026] 1. Put ordinary wood chips with a particle size of less than 1mmX1mmX1mm into the reactor, add toluene solvent to completely immerse them for 12min, steam dry at 110°C, and vacuum to 150Pa to obtain wood chips with a moisture content of 8-13%;
[0027] 2. Use formic anhydride to immerse the wood chips obtained in step 1, add 30% formic anhydride, toluene as the solvent, pressurize to 1MPa, react at 120°C for 10h, release the pressure and formic anhydride, and vacuum to 150Pa to obtain The water content is 5-8% wood chips.
[0028] 3. Add toluene solvent, FRW flame retardant, glass fiber and trimethylolpropane tris(3-aziridinyl propionate) binding agent to the wood chips obtained in step 2, and proceed at 100℃~120℃ Mix and stir to obtain flame-retardant 3D printed wood chips.
Example Embodiment
[0029] Example 3:
[0030] A preparation method of 3D printing wood chip material, the specific steps are as follows:
[0031] 1. Put ordinary wood chips with a particle size of less than 1mmX1mmX1mm into the reactor, add ethylbenzene solvent to completely immerse them for 10min, steam dry at 100℃, and vacuum to 200Pa to obtain wood chips with a moisture content of 8-15% ;
[0032] 2. Use acetic anhydride to immerse the wood chips obtained in step 1, add 20% acetic anhydride, ethylbenzene as the solvent, pressurize to 1MPa, react at 110°C for 8h, release the pressure, unload the acetic anhydride, and vacuum to 200Pa to obtain Sawdust with a moisture content of 5-10%;
[0033] 3. Add ethylbenzene, dihydrogen ammonium monoboric acid flame retardant, polyacrylonitrile-based carbon fiber and trimethylolpropane tris (3-aziridinyl propionate) binding agent to the wood chips obtained in step 2, Mix and stir at 100°C to 120°C to obtain a flame-retardant 3D printed wood chip material.
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