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Magnesia cement glued straw artificial board and preparation method thereof

A technology of magnesium cement and wood-based panels, which is applied in the field of building material engineering, can solve the problems of glass fiber strength attenuation, straw wood-based panels are not fireproof, and use scope restrictions, and achieve the effects of maintaining ecological balance, shortening production cycles, and saving labor time.

Pending Publication Date: 2020-11-17
北京水木华宸科技发展有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the glass fiber is susceptible to moisture erosion and alkaline corrosion, the strength of the glass fiber is continuously attenuated, and the scope of use is greatly restricted.
Particleboards, wood wool boards, and wood chipboards bonded with magnesium oxychloride cement or magnesium oxysulfide cement have been successfully developed and produced on a large scale abroad. Only particleboard has formed two major international brands since the 1970s (Heraklith board in Europe and Tectum board in the United States). board), but only limited to woody plants. For straw-based panels, the organic adhesive isocyanate resin (MDI) is still used. However, organic glued straw-based panels are not fireproof, not waterproof, easy to age, and easy to mildew

Method used

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Examples

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Effect test

preparation example Construction

[0024] The preparation method of the magnesium cement glued straw artificial board of the present invention comprises: adding water to the magnesium sulfoaluminate cement and stirring it into a pure magnesium cement slurry, and mixing it with processed long strips of straw in a roller to form a semi-dry slurry; Packed into a semi-dry slab; preheated and pre-pressed for heat preservation, hot-pressed in a plane press after the initial setting time of the magnesium cement and before the final setting time; after natural curing and post-treatment, it becomes a magnesium cement glued straw Wood-based panels. Straw is an annual plant with a short growth period, low lignification, short fiber cells, and high ash and sugar content. Compared with wood materials, the mechanical properties of straw are poor. Therefore, straw stalks are used to make magnesium cement glued straw wood-based panels. When processing straw stalks, the mechanical damage of straw fibers caused by impact and c...

Embodiment 1

[0028] Example 1: Magnesium cement glued wheat straw wood-based panel

[0029] The wheat straw is cut open and processed into long strips with a length of 20-25 mm and a width of 1.0-1.5 mm. In parts by weight, 100 parts of long wheat straw and 200 parts of magnesia sulphoaluminate cement are taken. The magnesia sulphoaluminate cement is mixed with water to form a clean slurry, and after the clean slurry is made, it is fully mixed with long strips of wheat straw in a roller mill to form a semi-dry slurry. After directional paving into a semi-dry slab, after preheating and pre-pressing and heat preservation, the pressure is 4 MPa, the temperature is 130 ° C, the hot pressing time is 5 minutes, and the natural curing is 5 days after demoulding. After trimming, it becomes a magnesium cement glued straw wood-based panel. All performance indicators can meet the requirements specified in JC / T411-2007 "cement chipboard" and GB / T24312-2009 "cement particleboard".

Embodiment 2

[0030] Example 2: Magnesium cement glued corn stalk wood-based panel

[0031] The pith is removed from the corn stalk, and the outer skin is processed into a stalk filament with a length of 15-30 mm and a width of 0.8-1.5 mm. In parts by weight, 100 parts of corn stalk silk and 30 parts of magnesia sulphoaluminate cement are taken. The magnesia sulphoaluminate cement is mixed with water to form a clean slurry, and after the clean slurry is made, it is fully mixed with corn stalks in a roller mill to form a semi-dry slurry. After directional paving into a semi-dry slab, after preheating and pre-pressing and heat preservation, it is hot-pressed at a pressure of 6MPa, a temperature of 150°C, and a hot-pressing time of 7 minutes. After demoulding, it is naturally cured for 7 days, and after trimming, it becomes a magnesium cement glued corn stalk wood-based panel. All performance indicators can meet the requirements stipulated in GB / T18958-2013 "Fire Retardant Medium Density Fib...

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Abstract

The invention relates to a magnesia cement glued straw artificial board and a preparation method thereof. The magnesia cement glued straw artificial board is manufactured by compounding straw and magnesia sulphoaluminate cement. The weight ratio of the straw to the magnesia cement is, for example, 100: 30 to 100: 200. Preferably, the magnesia cement is magnesia sulphoaluminate cement with high sugar resistance. The magnesia cement glued straw artificial board has the advantages that (1) agricultural waste straw is utilized; (2) a semi-dry hot press molding process is adopted, so that the production period is shortened; and (3) the manufactured magnesia cement glued straw artificial board is fireproof, waterproof, anti-aging, anti-mildew, large in thermal resistance and beneficial to building energy conservation.

Description

technical field [0001] The invention belongs to the field of building material engineering and relates to a magnesium cement glued straw artificial board and a production and preparation method thereof. Background technique [0002] The existing magnesium cement glued straw wood-based panel technology includes magnesium oxychloride cement or magnesium oxysulfide cement and straw scraps, glass fiber mesh cloth, and adopts wet material method roll forming to produce glass magnesium flat board. Because the glass fiber is susceptible to moisture erosion and alkaline corrosion, the strength of the glass fiber is continuously attenuated, which is greatly restricted in the scope of use. Particleboards, wood wool boards, and wood chipboards bonded with magnesium oxychloride cement or magnesium oxysulfide cement have been successfully developed and produced on a large scale abroad. Only particleboard has formed two major international brands since the 1970s (Heraklith board in Europe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/30B28B3/00B28C5/40C04B111/20C04B111/27C04B111/28
CPCC04B28/30B28C5/402B28C5/406B28B3/00C04B2111/27C04B2111/28C04B2111/2092C04B18/248
Inventor 马新花谌萌丛鲁克高忠文周树海
Owner 北京水木华宸科技发展有限公司
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