CN1586843A

CN1586843A - Method for producing nano artificial board

Info

Publication number: CN1586843A
Application number: CN 200410060862
Authority: CN
Inventors: 甘卫星
Original assignee: Guangxi University
Current assignee: Guangxi University
Priority date: 2004-09-14
Filing date: 2004-09-14
Publication date: 2005-03-02
Anticipated expiration: 2024-09-14
Also published as: CN1586843B

Abstract

The making process of high strength environment protecting artificial board features that during the traditional process of making board with wood fiber and non-wood fiber material and through mechanical separation into unit material in different shapes, drying, gluing, assembling, spreading and hot pressing, nanometer adhesive is adopted. The material consists of unit material 82-92 wt% and nanometer adhesive or nanometer material plus adhesive 8-18 wt%, where nanometer material accounting for 0.5-12 wt%.

Description

The manufacture method of nanometer wood-based plate

Technical field:

The present invention relates to the wood-based plate field, specifically is the process that is processed into sheet material with lignocellulose raw material and non-wood raw material.

Technical background:

Wood-based plate, comprise fiberboard, particieboard, glued board (containing core-board), it be meant component units (fiberboard is that fiber, particieboard are that wood shavings, glued board are that rotary cut venner, core-board are rotary cut venner and reel) drying, applying glue, the assembly of lignocellulose raw material and non-wood raw material or mat formation, the hot-forming various sheet materials of making.The GB18580-2001 national standard that the Chinese government issues at the bottom of calendar year 2001, on July 1st, 2002 executed, wherein the burst size of methanal of regulation wood-based plate is E2 level≤30mg/100g, E1 level≤9mg/100g (perforation extraction); E2 level≤5mg/L, E1 level≤1.5mg/L (drier method).People generally believe that the adhesive that adopts low mol ratio is to solve the important channel that formaldehyde discharges problem.Facts have proved that though adopt the prescription of low mol ratio can reach environmental requirement, the intensity of wood-based plate descends greatly.Though the present wood-based plate of producing or adopt common adhesive to improve intensity but formaldehyde is seriously polluted is though or adopting the adhesive of low mol ratio to solve the intensity that formaldehyde discharges the problem wood-based plate descends greatly.

Summary of the invention:

The object of the invention is to overcome the defective that prior art exists, and a kind of new method of making high-strength environment-friendly type wood-based plate is provided.

The scheme that the object of the invention realizes is to adopt nano material in manufacturing process, promptly be at the unit material that lignocellulose raw material or non-wood raw material is separated into different shape through machining, drying, applying glue, group is gone bad or is mated formation, in hot-forming traditional wood-based plate processing technology of making sheet material, the applying glue operation changed into apply the modifying wood with nano material adhesive, or in the impregnation technology of wood adhesive, adopt nano material, applying glue is in the wood-based plate unit material then, again it is mated formation, hot pressing, the part by weight of material is: unit material accounts for 82%～92%, the nanometer adhesive accounts for 8%～18%, and wherein the nano material consumption is 0.5%～12% of an adhesive consumption.Concrete production technology is: the unit material (fiberboard is that fiber, particieboard are that wood shavings, glued board are that rotary cut venner, core-board are rotary cut venner and reel) that at first lignocellulose raw material and non-wood raw material is separated into different shape through machining, apply the nano modification adhesive then or in impregnation technology, adopt nano material, again it is mated formation or assembly, hot-forming at last.

The modifying wood with nano material adhesive that the present invention adopts is to add nano material in common adhesive, and the optimum mole ratio of adhesive is the 1.10-1.40 ratio of formaldehyde (urea with); The nano level SiO of the most suitable employing of nano material ₂, CaCO ₃, TiO ₂, ZnO, Al ₂O ₃Deng material, can be a kind of or its combination among them.

With the high-strength environment-friendly type nanometer wood-based plate that the inventive method is made, than the high 26%-50% of bonding strength of common wood-based plate, and free formaldehyde release has reduced 20%-40%.The present invention had both solved the problem that the free formaldehyde release of common wood-based plate exceeds standard and the problem of physical and mechanical property difference, had also solved the problem of suitability for industrialized production nanometer wood-based plate cost performance simultaneously.

The specific embodiment:

Embodiment 1:

The nanometer adhesive formulation: the mol ratio of urea and formaldehyde is 1.2; Formaldehyde, content 37%, 560 kilograms of consumptions; Urea, content 100%, 345 kilograms of consumptions; Polyvinyl alcohol, content 100%, 10 kilograms of consumptions; Liquid caustic soda (NaOH), content 30%, an amount of (accent pH value); Ammonium chloride, content 25%, an amount of (accent pH value); Nano material, SiO ₂3 kilograms, CaCO ₃4 kilograms, TiO ₂2 kilograms.Nanometer adhesive synthesis technique: in stainless steel cauldron, drop into the formalin of full dose by prescription, start paddle, add 200 kilograms in first urea, and add 10 kilograms of polyvinyl alcohol, hydro-oxidation sodium adjust pH is 7.2-7.6, open return valve, open steam valve then and slowly evenly heat up, in 20 minutes, steadily rise to 72 ℃, the steam off valve allows reactant be warming up to 92 ± 1 ℃ automatically then.Be incubated 30 minutes, be cooled to 86 ± 1 ℃, add ammonium chloride adjust pH to 4.5 and carry out polycondensation reaction, when viscosity reaches 20 seconds (be coated with-4 glasss, 20 ℃ after), add second batch of urea 105 kg and add NaOH to regulate pH value to 5.5, lower the temperature slightly and be incubated at 75 ℃ of about 30-40 minutes, survey cloud point, add 40 kilograms in the 3rd batch of urea at last, add nano level SiO simultaneously ₂3 kilograms, CaCO ₃4 kilograms, TiO ₂2 kilograms, with NaOH the pH value is adjusted to 7.2, be cooled to 69 ± 1 ℃ slightly, be incubated 20 minutes.The closing volume valve carries out vacuum dehydration (nanometer glued board and nanometer core-board adhesive do not need to carry out vacuum dehydration) then, after solid content reaches 62 ± 1%, stop the dehydration, the pH value is transferred to 7.5, be cooled to 35 ℃ after discharging.

Adopt nano material in the impregnation technology: produce adhesive by above-mentioned synthesis technique, just temporarily do not add nano material, but with nano level SiO ₂, CaCO ₃, TiO ₂Material adds in the impregnation operation of Wood-based Panel Production.

Embodiment 2:

The manufacture method of nanofiber plate.Component: fiber 82%, adhesive 7%, CaCO ₃0.5%, TiO ₂0.5%.The fiber element material of drying adds CaCO in impregnation ₃And TiO ₂, again through mat formation, the hot-forming nanofiber plate of making.

Embodiment 3:

The manufacture method of nanometer particieboard.Component: wood shavings 89%, adhesive 10.6%, CaCO ₃0.2%, SiO ₂0.2%.The wood shavings unit material of drying adds CaCO in impregnation ₃And SiO ₂, again through mat formation, the hot-forming nanometer particieboard of making.

Embodiment 4:

The manufacture method of nanometer glued board.Component: base material 90%, press the nanometer adhesive 10% of example example 1 method preparation.In base material, apply the nanometer adhesive after organize badly, hot-forming, make the nanometer glued board.

Embodiment 5:

The manufacture method of nanometer core-board.Component: base material 92%, adhesive 6.5%, SiO ₂1.5%.When base material impregnation operation, add SiO ₂, impregnation after mat formation, the hot-forming nanometer core-board of making.

Claims

1, a kind of manufacture method of nanometer wood-based plate, it is the unit material that lignocellulose raw material or non-wood raw material is separated into different shape through machining, drying, applying glue, group is gone bad or is mated formation, the hot-forming sheet material of making, it is characterized in that applying glue is to apply the modifying wood with nano material adhesive or add nano material in the impregnation technology of Wood-based Panel Production, applying glue is in the wood-based plate unit material then, the part by weight of material is: unit material accounts for 82%～92%, the nanometer adhesive accounts for 8%～18%, and wherein the nano material consumption is 0.5%～12% of an adhesive consumption.

2,, it is characterized in that the nano material that is adopted is SiO according to the manufacture method of the described nanometer wood-based plate of claim 1 ₂, CaCO ₃, TiO ₂, ZnO, Al ₂O ₃In a kind of or its combination.

3,, it is characterized in that used modifying wood with nano material adhesive is to add nano material in common adhesive according to the manufacture method of claim 1 or 2 described nanometer wood-based plates.