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Method for preparing compressed section bar

A profile and wood technology, which is applied in the field of preparation of compressed profiles, can solve the problems of reduced dimensional stability of profiles, and achieve high dimensional stability, low production cost, and good mechanical properties

Inactive Publication Date: 2013-02-27
HUZHOU TIEFO REFRACTORIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the substrate layer treated by this method is only mechanically compressed and not cured. It will be affected by temperature and humidity during use, which will reduce the dimensional stability of the profile.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A method for preparing a compressed profile, comprising the steps in turn:

[0044] a. Lumber making: wood blanks are made from fast-growing logs;

[0045] b. Normal temperature, normal pressure or low pressure impregnation of acetylated solution of 2,2-bis(3,5-diamino-4-hydroxyphenyl)propane with a thermal decomposition temperature above 200°C and a concentration of 15-20wt% flame retardant 1- 2h;

[0046] c. Compression carbonization: On the hot press, control the temperature of the backing plate of the hot press to 150-180°C, send the wood obtained after the treatment in step b into the hot press, and quickly close the hot press until it just touches the wood. Preheat for 10-120s, then keep warm for 1-3 hours; then stack the pressed wood, put it on a pallet, send it to a carbonization kiln using superheated steam as the heat treatment medium, and treat it under the condition of 180-210°C for 2 ~4h;

[0047] d. Shape for 5-8h.

[0048]

Embodiment 2

[0050] Same as Example 1, the difference is that the flame retardant in step b is an ammonium polyphosphate solution with a concentration of 35-45wt%, and the ammonium polyphosphate flame retardant is preferably a high degree of polymerization crystalline type II ammonium polyphosphate (NH 4 PO 3 ) n (n>20), impregnate flame retardants with thermal decomposition temperature above 200°C for 1.5 hours at normal temperature and pressure or low pressure. The step c is on the hot press, and the temperature of the backing plate of the hot press is controlled to be 160°C, and the wood obtained after the treatment in step b is sent to the hot press, and the hot press is quickly closed until it just touches the wood, and the wood is preheated for 50°C. ~100s, then keep warm for 1~3h; then stack the pressed wood, put it on the pallet, send it to a carbonization kiln using superheated steam as the heat treatment medium, and treat it at 180~210℃ for 2~4h.

[0051]

Embodiment 3

[0053] Same as Example 2, the difference is that the step c is on the hot press, the temperature of the backing plate of the hot press is controlled at 160°C, the wood obtained after the treatment in step b is sent into the hot press, and the hot press is quickly closed until it just touches For wood, preheat the wood for 80s, then keep it warm for 2 hours; then stack the pressed wood, put it on a pallet, and send it to a carbonization kiln using superheated steam as the heat treatment medium, and treat it at 180-210 °C 2~4h. Said step d is finalized for 5-8h.

[0054]

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PUM

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Abstract

The invention relates to a method for preparing a compressed section bar, which belongs to a wooden product production process technology. The method comprises the following steps of: a, preparing a material: preparing a wooden blank from a raw wood fast-growing lumber; b, dipping a flame retardant of which the thermal decomposition temperature is over 200 DEG C for 1-2 hours at normal temperature and under normal pressure or a low pressure; c, pressing and carbonizing: on a hot press, controlling the temperature of a base plate of the hot press at 150-180 DEG C, feeding wood obtained in the step b into the hot press, rapidly closing the hot press till wood is just contacted, preheating wood for 10-120 seconds, and preserving heat for 1-3 hours; and piling pressed wood, putting onto a tray, feeding into a carbonizing kiln in which overheat steam is taken as a thermal treatment medium, and treating at the temperature of 180-210 DEG C for 2-4 hours; and d, forming for 5-8 hours. Due to the adoption of the production method disclosed by the invention, a rapid-growing solid wood flame-retardant section bar of a large thickness can be molded at one time, and the prepared section bar has high corrosion resistance, high weather resistance, a long service life and a wide application range.

Description

technical field [0001] The invention belongs to the field of wood product production, and in particular relates to a method for preparing compressed profiles. Background technique [0002] As a renewable resource, wood is more and more valued by people, but the anisotropy of wood itself makes wood prone to warping, cracking, deformation, perishability, mildew, and short service life during use, especially fast-growing wood. , these wood defects are more serious, thereby limiting the use of wood. Therefore, in order to improve the dimensional stability of wood and prolong the service life of wood, people have carried out many scientific research activities on the improvement of wood function. [0003] In the 1990s, Finland, the Netherlands, France and Germany began to conduct research on carbonized wood (scientific name: heat-treated wood or heat-modified wood). The typical process is to impregnate the wood in high-temperature (160°C-240°C) hot oil. Processing, or using ine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27M1/08B27M1/06B27M1/02B27K3/02B27K3/42B27K3/16
Inventor 计小良
Owner HUZHOU TIEFO REFRACTORIES
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