Straw particle board employing bark powder modified phenolic resins as adhesives
A technology of phenolic resin glue and phenolic resin, applied in the field of wood science, can solve the problems of environmental pollution and waste, and achieve the effects of simple operation, excellent performance and low cost
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Embodiment 1
[0033] Example 1: Preparation of Rice Straw Particleboard Using Larch Bark Powder Modified Phenolic Resin as Adhesive
[0034] The steps of preparing this rice straw particle board are as follows:
[0035] (1) Preparation of larch bark powder modified phenolic resin adhesive
[0036] Grind 100 kg of larch bark into 80-mesh bark powder and put it into the reaction kettle, add 300 kg of phenol and 6 kg of concentrated sulfuric acid, stir evenly and heat up to 100 ° C, after 2 hours of heat preservation, add 42% sodium hydroxide to carry out After neutralization, lower the temperature to 40°C to obtain a tan viscous liquid which is liquefied larch bark powder activated by phenol, lower the temperature to 40°C, and discharge for storage.
[0037] Raise the temperature of the liquefied larch bark powder to 40°C, add 417 kg of formaldehyde, 81 kg of 42% sodium hydroxide and an appropriate amount of water for the first time, part of which is used to neutralize the acid in the liquef...
Embodiment 2
[0042] Example 2: Preparation of wheat straw particleboard with black wattle bark powder modified phenolic resin as adhesive
[0043] The steps of preparing this wheat straw particle board are as follows:
[0044] (1) Preparation of black wattle bark powder modified phenolic resin adhesive
[0045] Grind 71 kg of black wattle bark into 60-mesh bark powder and put it into the reaction kettle, add 211 kg of phenol and 6.5 kg of concentrated sulfuric acid, stir evenly and heat up to 100°C, keep it warm for 2 hours, add magnesium oxide for neutralization , cooled to 40°C to obtain tan viscous liquid which is liquefied black wattle bark powder activated by phenol, cooled to 40°C, and discharged for storage.
[0046] Raise the temperature of the liquefied black wattle bark powder to 40°C, add 264 kg of formaldehyde, 22 kg of 42% sodium hydroxide and an appropriate amount of water for the first time, heat it for 30 minutes when the temperature is raised to 88°C, and then cool down t...
Embodiment 3
[0051] Example 3: Preparation of corn straw particleboard with fir bark powder modified phenolic resin as adhesive
[0052] The steps to prepare this corn stalk particle board are as follows:
[0053] (1) Preparation of fir bark powder modified phenolic resin adhesive
[0054] Grind 82.5 kg of fir bark into 80-mesh bark powder and put it into the reaction kettle, add 250 kg of phenol and 12.5 kg of concentrated hydrochloric acid, stir evenly and heat up to 120°C, keep it warm for 1.5 hours, add magnesium oxide for neutralization, Cool down to 40°C to obtain liquefied fir bark powder activated by phenol as a tan viscous liquid, cool down to 40°C, and discharge for storage.
[0055] Raise the temperature of the liquefied fir bark powder to 40°C, add 364 kg of formaldehyde, 30.2 kg of 42% sodium hydroxide and an appropriate amount of water for the first time, heat it up to 90°C for 20 minutes, and then cool it down to 60°C for the second time Add the remaining 91 kg of formalde...
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