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A kind of preparation method of alkali-process steam-exploded straw glue-free wood-based panel

A technology of steam-exploding straw and wood-based panels, which is applied to the pretreatment of flat products, manufacturing tools, and molding materials. Improve the content of active groups, save the cost of adding, simplify the process and production line

Inactive Publication Date: 2016-02-24
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] Embodiment 1: Corn stalks are chopped to 2-5 cm, completely immersed in 1% NaOH solution for 10 minutes, taken out, dried to a water content of 30%, packed into a steam explosion tank, and fed with high-pressure steam, at a steam pressure of 1.5 MPa Keep it under the pressure for 5 minutes, and release it instantly under reduced pressure to obtain the alkaline steam-exploded corn stalks. The steam-exploded straw is dried or naturally dried to a water content of 20%, and evenly spread on the platen press, and the upper and lower surfaces of the material contacting the hot platen are all covered with kraft paper. The hot pressing pressure is 0.8 MPa, the temperature is 190° C., and the time is 8 minutes. The glue-free corn stalk wood-based panel can be prepared after the pressure is released and taken out.

Embodiment 2

[0014] Embodiment 2: corn stalks are chopped to 2-5 cm, completely soaked in 2% NaOH solution for 5 minutes, taken out, dried to a water content of 40%, packed into a steam explosion tank, and fed with high-pressure steam, at a steam pressure of 1.3 MPa Keep it under pressure for 10 minutes, and release the pressure instantly to obtain steam-exploded corn stalks. Dry the steam-exploded straw or dry it naturally until the water content is 25%, and spread it evenly on the platen press, and cover the surface of the material touching the hot platen with kraft paper. The hot pressing pressure is 1.0MPa, the temperature is 180°C, the time is 10min, and the glue-free corn stalk wood-based panel can be prepared after the pressure is released and taken out.

Embodiment 3

[0015] Embodiment 3: corn stalks are chopped to 2-5 cm, completely soaked in 3% NaOH solution for 5 minutes, then taken out, dried to a water content of 50%, packed into a steam explosion tank, fed with high-pressure steam, at a steam pressure of 1.2 MPa Keep it under pressure for 10 minutes, and release the pressure instantly to obtain steam-exploded corn stalks. Dry the steam-exploded straw or dry it naturally to a water content of 30%, spread it evenly on the platen press, and cover the surface of the material touching the hot platen with kraft paper. The hot pressing pressure is 1.2MPa, the temperature is 170°C, the time is 10min, and the glue-free corn stalk wood-based panel can be prepared after the pressure is released and taken out.

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Abstract

The invention belongs to the field of binder-less environment-friendly artificial board production, and particularly relates to a method for producing binder-less environment-friendly artificial boards by means of hot pressing with steam exploded stalks as raw materials. The method includes steps of chopping the stalks, dipping the chopped stalks into alkali solution and then taking out with water content controlled, performing a steam explosion process on the stalks to obtain steam exploded stalks, drying the steam exploded stalks until reaching a certain water content, and finally performing hot press molding. In the method, alkali lignin is dissolved out during high-temperature digesting of the alkali-process steam explosion, and is blown instantly to damage cell wall structures, so that active groups of three components in the raw materials are exposed fully. In the later hot press molding process, the lignin dissolved out is subjected to condensation reaction with polysaccharide and lignin of the raw materials at a high temperature so as to form a binding effect. By the method, binder-less binding of the stalks is realized, cost for adding binders is saved, processing and production lines are simplified, environmental pollution caused by synthetic resin binders is reduced, production cost is lowered, and a new effective way is provided for artificial board production.

Description

technical field [0001] The invention belongs to the field of preparation of glue-free environment-friendly wood-based panels, in particular to a method for preparing glue-free environment-friendly wood-based panels by hot-pressing alkaline steam-exploded straw as a raw material. Background technique [0002] my country is a big agricultural country, with an annual output of about 700 million tons of crop straw, which is a huge treasure house of renewable resources. Among the comprehensive industrial utilization technologies of straw, the technology of preparing wood-based panels from straw has huge market development potential and industrialization prospects, which are mainly reflected in the following two aspects: First, with the continuous, rapid and stable development of my country's national economy, construction Industry, manufacturing, residential decoration, packaging and other related industries have continuously expanded demand for panels; second, my country's forest...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B27N1/00B27N3/04B27N3/12
Inventor 陈洪章王冠华
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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