High-strength straw brick and preparation method thereof
A straw brick, high-strength technology, applied in the field of straw building materials, can solve the problems of difficult to obtain satisfactory bonding strength, complex and irregular shape of straw, low comprehensive mechanical strength of materials, etc. Effect
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[0015] Example 1
[0016] A high-strength straw brick is made of the following raw materials: 80 parts by weight of modified straw, 30 parts of cement, 10 parts of modified urea-formaldehyde resin, 10 parts of stone powder, 3 parts of ceramsite, 0.1 parts of ammonium chloride, and polystyrene 1 part of sulfide powder.
[0017] The preparation method is as follows: mix the modified straw, stone powder, ceramsite, polyphenylene sulfide powder and cement, stir evenly, add appropriate amount of water and stir evenly, add the modified urea-formaldehyde resin, stir evenly, and then add ammonium chloride and stir evenly to obtain Mixture: pave the mixture into a mold, press and shape, coagulate and cure, solidify and release, and dry, and it is ready.
Example Embodiment
[0018] Example 2
[0019] A high-strength straw brick is made of the following raw materials: 70 parts by weight of modified straw, 25 parts of cement, 10 parts of modified urea-formaldehyde resin, 9 parts of stone powder, 3 parts of ceramsite, 0.2 parts of ammonium chloride, and 1 part of phenyl sulfide powder.
[0020] The preparation method of the modified urea-formaldehyde resin is as follows: add the formaldehyde solution to the reactor, adjust the pH to 8.0, raise the temperature to 80°C, add the first batch of urea, mix uniformly, keep the reaction temperature for 30 minutes, the reaction is over, and the temperature is reduced to 70°C , Adjust the pH to 5, keep for 20 minutes, then adjust the pH to 7, add the second batch of urea, mix well, keep the reaction for 20 minutes, cool to 30°C, adjust the pH to 4.5, add 2,2-bis(dimethylol)aniline, After the reaction is kept for 30 minutes, the pH is adjusted to 7.0 to obtain a modified urea-formaldehyde resin. Among them, the ma...
Example Embodiment
[0022] Example 3
[0023] A high-strength straw brick, comprising the following raw materials by weight: 75 parts by weight of modified straw, 26 parts of cement, 12 parts of modified urea-formaldehyde resin, 8 parts of stone powder, 4 parts of ceramsite, 0.2 parts of ammonium chloride, poly 0.5 parts of phenyl sulfide powder.
[0024] Among them, the preparation method of modified straws is as follows: dry crop straws, crush them, add them to lye and soak them for 5 hours, remove them, wash them to neutrality, dry them, and cut them into 4mm straw sections. Add the straw section of the stalk to the steam explosion tank, pass steam into the tank to a pressure of 1.5MPa, hold the pressure for 8 minutes, perform steam explosion treatment, and release the pressure to spray to obtain modified straw.
[0025] A method for preparing high-strength straw bricks, the steps are as follows: mix modified straw, stone powder, ceramsite, polyphenylene sulfide powder and cement, stir evenly, add a...
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