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Method for manufacturing binder-less environment-friendly artificial boards from steam-exploded stalks

A technology of environmentally friendly wood-based panels and steam-exploded straw, which is applied in the direction of manufacturing tools, pressure impregnation, and wood processing equipment, can solve the problems of uneven distribution of laccase enzyme activity, long microbial growth cycle, and low production efficiency of press boards, and achieve reduction Effects of environmental pollution, improved wettability, simplified process and production line

Inactive Publication Date: 2013-10-23
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method does not require an external adhesive, the production efficiency of the press plate is low due to the long microbial growth cycle, and the uneven distribution of laccase activity can easily lead to product instability.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: Corn stalks were chopped to 5 cm, put into a steam explosion tank, fed with high-pressure steam, maintained at a steam pressure of 1.5 MPa for 5 minutes, and released under reduced pressure instantly to obtain steam-exploded corn stalks. The steam-exploded straw is dried or air-dried to a water content of 5%, uniformly mixed with 1% sodium hydroxide solution, the mass solid-liquid ratio is 1:1, and the water content is 52.5%. The steam-exploded straw material added with alkali solution is spread evenly on the platen press, and the upper and lower surfaces of the material contacting the hot platen are all covered with kraft paper. The pre-compression pressure is 0.1MPa, the temperature is 110°C, and the time is 8 minutes. At this time, the water content of the raw material is reduced to 25%, and the hot-pressing pressure is increased to 1.2MPa. The hot-pressing temperature is 185°C, and the time is 8 minutes. The glue-free corn stalk wood-based board can be pr...

Embodiment 2

[0014] Example 2: corn stalks were chopped to 4 cm, put into a steam explosion tank, fed with high-pressure steam, maintained at a steam pressure of 1.3 MPa for 8 minutes, and released instantly under reduced pressure to obtain steam-exploded corn stalks. The steam-exploded straw is dried or air-dried to a water content of 5%, and mixed evenly with 2% sodium hydroxide solution, the mass solid-liquid ratio is 5:4, and the water content is 47.2%. The steam-exploded straw material added with alkali solution is spread evenly on the platen press, and the upper and lower surfaces of the material contacting the hot platen are all covered with kraft paper. The pre-pressing pressure is 0.2MPa, the temperature is 100°C, and the time is 10 minutes. At this time, the water content of the raw material is reduced to 23%, and the hot-pressing pressure is increased to 1.5MPa. The hot-pressing temperature is 170°C, and the time is 8 minutes. The glue-free corn stalk-based panel can be prepared...

Embodiment 3

[0015] Example 3: Wheat straw was chopped to 4 cm, put into a steam explosion tank, fed with high-pressure steam, kept at a steam pressure of 1.3 MPa for 10 minutes, and instantly decompressed and released to obtain steam-exploded wheat straw. The steam-exploded straw is dried or air-dried to a water content of 5%, and mixed evenly with 2% sodium hydroxide solution, the mass solid-liquid ratio is 5:4, and the water content is 47.2%. The steam-exploded straw material added with alkali solution is spread evenly on the platen press, and the upper and lower surfaces of the material contacting the hot platen are all covered with kraft paper. The pre-compression pressure is 0.2MPa, the temperature is 90°C, and the time is 8min. At this time, the water content of the raw material is reduced to 21%, and the hot-pressing pressure is increased to 0.8MPa. The hot-pressing temperature is 190°C, and the time is 5min. The glue-free wheat straw artificial board can be prepared.

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PUM

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Abstract

The invention belongs to the field of manufacture for binder-less environment-friendly artificial boards, and particularly relates to a method for manufacturing binder-less environment-friendly artificial boards. The method is used for manufacturing the binder-less environment-friendly artificial boards from steam-exploded stalk raw materials by means of alkaline activation hot-pressing. The method includes steps of chopping stalk raw materials and performing steam explosion on the chopped stalk raw materials to obtain steam-exploded stalks; adding aqueous alkali into the steam-exploded stalks; uniformly mixing the aqueous alkali with the steam-exploded stalks; controlling the moisture content of a mixture of the aqueous alkali and the steam-exploded stalks; performing hot-pressing and forming on the mixture. The method has the advantages that the wettability of the stalk raw materials can be improved by means of processing the stalks by a steam explosion technology, cell wall structures are destroyed, lignin in the raw materials is easy to dissolve out under an alkaline condition, dissolved lignin and the lignin and polysaccharide in the raw materials are subjected to condensation reaction under a high-temperature condition of a hot-pressing procedure to realize a binding effect, accordingly, the stalk raw materials are bound with one another without binders by the method, the binder adding cost is saved, a process and a production line are simplified, environmental pollution due to synthetic resin binders is reduced advantageously, the production cost is lowered, and a novel and effective way for manufacturing the artificial boards is provided.

Description

technical field [0001] The invention belongs to the field of preparation of glue-free environment-friendly wood-based panels, and in particular relates to a method for preparing glue-free environment-friendly wood-based panels by using steam-exploded straw as a raw material and activating hot pressing with alkali method. Background technique [0002] Agricultural and forestry biomass resources mainly include forest timber resources and crop stalks. Compared with developed countries, the per capita share of forest resources in my country is low. The contradiction between the demand for wood and wood-based panel products and the supply of wood has long existed. my country is a large agricultural country, with an annual output of about 700 million tons of crop straw, but it is generally not used efficiently and has even become a source of pollution in many areas. If my country's rich straw resources are used in the wood-based panel industry, it will greatly alleviate the contra...

Claims

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Application Information

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IPC IPC(8): B27M1/08B27K3/10
Inventor 陈洪章王冠华
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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