Glue-free fiber plasticized plate and preparation method thereof

A technology of fiber and wood fiber, which is applied in the field of glue-free fiber plasticized board and its preparation, can solve the problems of high water absorption expansion rate, low accessibility of hydroxyl groups, and low static bending strength of glue-free fiber board, and achieve water swelling The effect of low rate and high static bending strength

Active Publication Date: 2022-05-27
INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the aldehyde group of this method is significantly lower, and the accessibility of the hydroxyl group on the surface of the straw is lower, and the static bending strength of the formed glueless fiberboard is lower, and the water expansion rate is higher.

Method used

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  • Glue-free fiber plasticized plate and preparation method thereof
  • Glue-free fiber plasticized plate and preparation method thereof
  • Glue-free fiber plasticized plate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Step 1): add 800mL of distilled water to a 1.5L beaker, weigh 50g of poplar fiber into the beaker, quickly add 40g of sodium periodate and 5g of isopropanol, and stir at room temperature for 4h in the dark. Filter and wash to neutrality to remove unreacted sodium periodate and isopropanol, and obtain dialdehyde-modified wood fiber after drying and equilibration.

[0067] Step 2): Weigh 40g of dry dialdehyde-modified wood fibers and place them in a constant temperature and humidity box. Obtain the moisture content of 9% by gravimetric method, and disperse the wood fibers with 9% moisture content evenly with a pulverizing disperser for later use.

[0068] Step 3): Put the evenly dispersed wood fibers into a pre-pressing frame with a size of 10cm×10cm for preliminary pre-pressing, and then put a thickness gauge of 3mm thickness between the two steel plates, and perform hot pressing at 75 ° C. The pressure was 15 MPa, and after maintaining the pressure for 5 minutes, the pr...

Embodiment 2

[0074] Step 1): add 800mL of distilled water to a 1.5L beaker, weigh 50g of poplar fiber into the beaker, quickly add 50g of sodium periodate and 5g of isopropanol, and stir at room temperature for 6h in the dark. Filter and wash to neutrality to remove unreacted sodium periodate and isopropanol, and obtain dialdehyde-modified wood fiber after drying and equilibration.

[0075] Step 2): Weigh 40g of dry aldehyde-based wood fibers and place them in a constant temperature and humidity box, obtain a moisture content of 10% by a gravimetric method, and use a pulverizing and dispersing machine to disperse the wood fibers with a moisture content of 10% evenly for use.

[0076] Step 3): Put the evenly dispersed wood fibers into a pre-pressing frame with a size of 10cm×10cm for preliminary pre-pressing, and then put a thickness gauge of 3mm thickness between the two steel plates, and perform hot pressing at 100°C. The pressure was 20 MPa, and after maintaining the pressure for 3 minut...

Embodiment 3

[0082] Step 1): Add 800 mL of distilled water to a 1.5L beaker, weigh 50g of Chinese fir fiber into the beaker, quickly add 50g of sodium periodate and 5g of isopropanol, and stir at room temperature for 8h in the dark. Filter and wash to neutrality to remove unreacted sodium periodate and isopropanol, and obtain dialdehyde-modified wood fiber after drying and equilibration.

[0083] Step 2): Weigh 40g of dry aldehyde-based wood fibers and place them in a constant temperature and humidity box, obtain a moisture content of 12% by gravimetric method, and uniformly disperse the wood fibers with a moisture content of 12% with a pulverizing and dispersing machine for later use.

[0084] Step 3): Put the evenly dispersed wood fibers into a pre-pressing frame with a size of 10cm×10cm for preliminary pre-pressing, and then put a thickness gauge of 3mm thickness between the two steel plates, and perform hot pressing at 80 ° C. The pressure was 15 MPa, and after maintaining the pressure...

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Abstract

According to the glue-free fiber plastified plate and the preparation method thereof, wood fibers are prepared by dissociating a wood secondary wall S2 layer, the wood fibers are subjected to directional oxidation through sodium periodate to prepare dialdehyde modified wood fibers, the water content of the dialdehyde modified wood fibers is regulated and controlled to be 9%-15%, the dialdehyde modified wood fibers are subjected to hot pressing at the temperature of 75-100 DEG C to form the plate, and the glue-free fiber plastified plate is obtained. Therefore, the glue-free fiber plastified plate with high static bending intensity and low water absorption expansion rate is prepared.

Description

technical field [0001] The invention relates to a glue-free fiber plasticized board and a preparation method thereof, in particular to a glue-free fiber plasticized board based on wood fiber dialdehyde modification and a preparation method thereof. Background technique [0002] Adhesive-free fiberboard refers to a man-made fiberboard made by hot pressing wood fiber or other plant fiber without adding adhesive. Realize into a board. Adhesive-free fiberboard can avoid the drawbacks caused by adding adhesives because no additional adhesives are added. [0003] At present, the adhesives used for fiberboard in my country are still mainly aldehyde adhesives, mainly urea-formaldehyde resin adhesive, phenolic resin adhesive, melamine-formaldehyde resin adhesive, etc., which account for more than 90% of the total amount of adhesives used in the fiberboard industry. Fiberboard products made of adhesives will continuously release harmful gases such as formaldehyde, which will not only...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27N3/12B27N3/10B27K3/04D21B1/06D21D1/30
CPCB27N3/12B27N3/10B27K3/04D21B1/06D21D1/30Y02W30/91
Inventor 陈媛李改云张轶媛范东斌
Owner INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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