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Non-aldehyde recombinant material and manufacturing method thereof

A manufacturing method and technology for reconstituting materials, which can be used in the manufacture of tools, flat products, other household appliances, etc., can solve the problems of inability to dilute with water solvent, difficult to achieve uniform sizing, and high cost of reconstituted bamboo, so as to reduce costs and reduce costs. Environmental pollution, avoid harmful gas pollution to the air, the effect of strong solid wood

Active Publication Date: 2009-07-22
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

[0006] 3. At present, the adhesives used for recombined wood are mainly phenolic resin adhesives, urea-formaldehyde resin adhesives and melamine-modified urea-formaldehyde resin adhesives, all of which are polar adhesives. Since bamboo (wood) is a polar material, these adhesives Adhesives have poor permeability in bamboo (wood) wood, and it is difficult to achieve uniform sizing
The main reason: the sizing method of the recombined wood is the dipping method. In order to control the amount of sizing and the uniformity of the dipping, it is generally necessary to dilute the solid content of the adhesive to between 8% and 30%, while the aromatic diisocyanate It is a non-water-soluble adhesive and cannot be diluted with water solvents. If an aromatic diisocyanate adhesive is used to impregnate directly, the cost of producing recombined bamboo will be too high due to the high cost of aromatic diisocyanate

Method used

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  • Non-aldehyde recombinant material and manufacturing method thereof
  • Non-aldehyde recombinant material and manufacturing method thereof
  • Non-aldehyde recombinant material and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] A kind of formaldehyde-free recombined wood provided by the present invention comprises several pieces of bamboo (wood) bundles formed by parallel grain structures, between adjacent bamboo (wood) bundles and in the cracks of each bamboo (wood) bundle An adhesive layer is arranged in the middle, and the adhesive of the adhesive layer is aromatic diisocyanate.

[0053] The aromatic diisocyanate is diphenylmethane diisocyanate (MDI) or polymeric isocyanate (PMDI).

[0054] The sizing amount of the aromatic diisocyanate is 5% to 20% of the mass of the dry bamboo (wood) bundle.

[0055] If it is bamboo material, the bamboo bundle contains bamboo green and bamboo yellow.

[0056] like image 3 In the process shown, firstly, the fresh moso bamboo is sawn into 2.0m bamboo sections; the moso bamboo is divided into several pieces of bamboo, and after removing the bamboo green and bamboo yellow, it is loosened with a wire press machine to form a network The bamboo bundle of str...

Embodiment 2

[0071] use as Figure 4 In the process shown, first, fresh green bamboo, dragon bamboo, Ci bamboo, hemp bamboo, thunder bamboo, pole bamboo and other miscellaneous bamboos are cut and sawed into bamboo sections with a length of 2.0m; then they are divided into several bamboo pieces , using a debonding machine to decompose it to form bamboo bundles with a network structure, and the bamboo bundles contain bamboo green and bamboo yellow.

[0072] Drying of bamboo bundles: the above bamboo bundles were dried in an oven at 103° C. so that the final moisture content was 15%.

[0073] Bamboo bundle sizing: use the airless spray sizing method, the glue output pressure is 10MPa, the diameter of the nozzle is 0.35mm, and polymerized isocyanate (PMDI) is evenly sprayed on the bamboo bundle surface, and the sizing amount is the dry bamboo bundle 5% by weight.

[0074] Pavement of slabs: Weigh the wood bundles according to the preset density, and lay the above-mentioned sized wood bundle...

Embodiment 3

[0081] Cut and saw fresh poplar, eucalyptus, masson pine, locust tree, rubber wood, palm tree and other fast-growing wood or economic forest wood into 2.5m long wood sections; form veneers with a thickness of 4mm by rotary cutting, and then form Wood beam blinds with a width of 1220mm.

[0082] Drying of the wood bundle curtain: place the above wood bundle curtain in an oven at 103° C. for drying so that its final moisture content is 20%.

[0083]Glue sizing of wood beam curtains: Airflow spray sizing method is adopted, the air pressure is 0.35MPa, and the diameter of the nozzle is 1.3mm. The polymeric isocyanate (PMDI) will be evenly sprayed on the surface of the wood beam curtain, and the sizing amount is 18%.

[0084] Pavement of slabs: weigh the wood bundle curtain according to the preset density, and stack the above-mentioned glued wood bundle curtains in parallel along the direction of the grain to form blanks.

[0085] Curing molding: send the assembled slabs into a h...

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Abstract

The invention provides an aldehydeless heavy component material. The material comprises a plurality of bamboo (wood) bundles formed by a cis-grain parallel structure; an adhesive layer is arranged between the adjacent bamboo (wood) bundles and in the gap of each bamboo (wood) bundle; and an adhesive of the adhesive layer is aromatic diisocyanate. The adhesive application amount is 5 to 20 percentof absolute dry weight of the bamboo (wood) bundle. The invention also provides a method for manufacturing the heavy component material; the method comprises working procedures of the manufacture of the bamboo (wood) bundle, drying, adhesive application, assembly, curing molding, and post treatment, and the like. In the adhesive application procedure, the used adhesive is the aromatic diisocyanate; and the adopted adhesive application method is an adhesive application method through spraying. The method adopts the aromatic diisocyanate adhesive, so that formaldehyde release amount and free phenol detection value of the heavy component material are the same as the detection value of a bamboo (wood) base material, and the heavy component material has good bonding performance and strengthensthe mechanical performance of the heavy component material; the adhesive application method is adopted adhesive spraying in the process, so the manufacturing method greatly reduces the adhesive application amount, and application of the aromatic diisocyanate adhesive with high cost to the heavy component material has feasibility of implementation.

Description

technical field [0001] The invention provides a recombined wood, especially an aldehyde-free recombined wood. The invention also provides a method for manufacturing the aldehyde-free recombinant material. Background technique [0002] Recombined wood includes recombined bamboo and recombined wood, which is made of bundles (or strips) of bamboo or wood after a series of mechanical and chemical processing, and is made by drying, sizing, paving and gluing. A new type of wood or bamboo composite material, due to the special texture structure of the recombined wood, good physical and mechanical properties and high utilization of raw materials, in recent years, especially the recombined bamboo has been rapidly developed. Recombinant wood can be divided into hot-press curing molding method and cold-press drying curing molding method according to the molding process. The hot-press curing molding method is as follows: figure 1 As shown, the process of cold pressing, drying and curi...

Claims

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Application Information

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IPC IPC(8): B27N3/00B27N3/08B27N1/02
CPCB27N3/04
Inventor 余养伦于文吉祝荣先周月任丁华
Owner INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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