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

Active Publication Date: 2010-04-14
BEIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the straw is used as fuel, or farmers burn it directly in the farmland

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

A straw particle board employing bark powder modified phenolic resins as adhesives adopts straws as main raw materials and woodworking fragment wood shavings as secondary materials. The particle board is characterized in that the adhesives of the pressed straw particle board employ the bark powder modified phenolic resins, a large amount of renewable wood processing remained bark powders are adopted to replace parts of petrochemical phenols, the phenols are employed to directly activate the bark powders, the bark powders are applied to preparation of phenolic resin adhesives, and operation is simple. In a gluing process, CH3Si (OH) 3 organic silicon liquor with low cost is adopted to modify the adhesives so as to enable the adhesives to easily moisten, penetrate and diffuse on the surfaces of the straws, thereby being favorable for glue joint of the straws. Simultaneously, interfaces of the straws are modified so as to enable the bark powder adhesives to be applied to production of the straw particle board. The straw particle board produced by adopting the adhesives has the advantages of attaching importance to effective usage of biological materials, having low product manufacturing cost, fine performance, strong operability and bringing remarkable ecological benefits and environmental benefits after being popularized.

Description

technical field [0001] The invention relates to the preparation of a modified phenolic resin adhesive by using bark powder as a raw material, which is used for pressing straw particle boards, and belongs to the field of wood science and technology in forestry engineering. Background technique [0002] At present, crop straws, such as rice straw and wheat straw, are used as raw materials to press straw-based panels, and isocyanate adhesives are generally used. However, the price of this type of adhesive is high, and the price of isocyanate is 10-12 times that of urea-formaldehyde resin glue for wood particleboard. At present, the world is vigorously advocating the use of biomass energy and biomass materials and reducing petrochemical products. At the same time, a large amount of wood processing residues, such as bark powder, is effectively used as a biomass raw material, and its chemical properties are used to replace part of phenol for phenolic resin. Synthesis, which can n...

Claims

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Application Information

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IPC IPC(8): B27N3/02B27N1/00B27N1/02B27N3/08
Inventor 时君友温明宇
Owner BEIHUA UNIV
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