CN103552140A - Weather-resistant artificial bamboo and wooden board and manufacturing method thereof - Google Patents

Abstract

The invention discloses a weather-resistant artificial bamboo and wooden board and a manufacturing method thereof. The method comprises the following steps of mixing and dissolving 0.5 to 1.5 percent of a ultraviolet absorber and 0.8 to 2.0 percent of a free radical capturer by a small amount of distilled water, adding low-molecular-weight phenolic resin according to a ratio, and stirring and uniformly mixing the phenolic resin with a mixture of the ultraviolet absorber and the free radical capturer to obtain a solvent A; placing an artificial board surface layer material into the solvent A, completely soaking for 2h to 6h under the normal temperature and the normal pressure, and drying the soaked artificial board surface layer material under the normal temperature until the moisture content is 7 to 11 percent; assembling the artificial board surface layer obtained in step 2 and an artificial board base layer blank, thermally rolling, disassembling, and trimming to obtain a finished product. By soaking the outdoor artificial board surface layer, the light stabilizer and the antioxidant are permeated into cell cavities, even the cell walls, along the glue-water and then are assembled and thermally pressed with a core layer, so that the surface ultraviolet aging process can be slowed down in the application process, and the surface of the artificial board can be protected.

Description

A kind of weatherability bamboo and wood matter wood-based plate and manufacture method thereof

Technical field

The present invention relates to a kind of weatherability bamboo and wood matter wood-based plate and manufacture method thereof.

Background technology

China's outdoor bamboo and wood matter wood-based plate, as increasing in consumptions such as glued board, oriented wood chipboard, Recombined bamboos, these materials pass through preservative treatment conventionally, preservative treatment is only for the erosion of fungi, bacterium and sick worm, and out of doors in use procedure the irradiation of sunshine middle-ultraviolet lamp and the erosion of moisture the durability of material is also had a significant impact, surface produces free radical generation photochemical transformations, cause color, glossiness to change and rough surface, and then crack and deeper destruction, affect attractive in appearance and serviceability, shortened service life.Even therefore some bamboo wood manufacturing enterprises produce huge claim and cause stopping production even bankruptcy.Outdoor bamboo and wood matter wood-based plate field proposes harsh requirement to the weatherability of material, non-oxidizability etc., light aging and the research of protective mechanism aspect are very important, should take appropriate measures, and delay or prevent that phototropic from reacting, stop the erosion of moisture, to adapt to industrial expansion.

At present, light aging research mainly concentrates on the fields such as plastics, rubber, textile, coating, and the application aspect wood materials is very few.By in timber industry with applying light stabilizer and antioxidant in adhesive, can prevent or slow down the light aging process of wood-base fibre and particle panel material, while is along with the prolongation of dip time, low molecule phenolic resins is penetrated into part in wood tissue, the erosion that can resist moisture after solidifying, weaken the effect that surface extends its service life due to the caused hydrothermal aging of moisture expansion and drying shrinkage, increase value-added content of product.

Summary of the invention

The object of the present invention is to provide a kind of weatherability bamboo and wood matter wood-based plate and manufacture method thereof, concrete steps are as follows:

Step 1: in proportion 0.5-1.5% ultra-violet absorber (UVA) and 0.8-2.0% radical scavenger are carried out to mixed dissolution with a small amount of distilled water, add in proportion appropriate low molecule phenolic resins, stir and mix, obtain solvent orange 2 A;

Step 2: at normal temperatures and pressures, wood-based plate skin-material is put into solvent orange 2 A, thorough impregnation 2-6 hour, dry under normal temperature after taking out, to moisture content be 7-11%;

Step 3: by the wood-based plate top layer of gained in step 2 and wood-based plate basic unit assembly, hot pressing, unload plate and cutting edge, obtain finished product.

As preferably, described ultra-violet absorber (UVA) is O-hydroxyl-diphenyl ketone class.

Light stabilizer is to suppress or slow down because photooxidation makes macromolecular material the auxiliary agent of degraded occurs.Selection that can be strong absorbs high-energy ultraviolet light and carries out Conversion of Energy, with heat energy or harmless low forms of radiation, carries out power conversion, and the material that energy is discharged or consumed, is widely used in macromolecular material, textile process, outdoor coating and other field.Along with the increase day by day that synthetic material is applied out of doors, light stabilizer has become one of main species of macromolecular material auxiliary agent.Conventional light stabilizer is broadly divided into 4 classes by its mechanism of action, i.e. ultra-violet absorber (UVA), quencher, radical scavenger and photomask agent.

Ultra-violet absorber (UVA) UVA mainly can fall into 5 types by chemical constitution: (1) O-hydroxyl-diphenyl ketone class, and as UV-9, UV-531 etc.; (2) benzotriazole, as UV-P, UV-327, UV-326 etc.; (3) salicylate class, as BAD, TBS, OPS etc.(4) triazines, as ultra-violet absorber triazine-5; (5) group-substituted acrylonitrile, as UV-Absorber317 etc.

Radical scavenger can be caught the living radical generating in macromolecule, thereby suppresses photo-oxidation process, reaches the stable object of light.This class light stabilizer is mainly hindered amine as light stabilizer (HALS), is mainly that piperidines system, piperidines are that derivative and imidazolidinone are derivative.

The present invention adopts water-soluble O-hydroxyl-diphenyl ketone class light stabilizer and HALS type free base capturing agent, both are first used to a small amount of water-soluble solution, then be blended in phenolic resins, by impregnation process is carried out in outdoor wood-based plate top layer, cause light stabilizer and antioxidant along with glue is penetrated into lumen even in cell membrane, carry out assembly and hot pressing with heart layer again, the UVA on top layer can absorb harmful ultra-violet radiation, and energy dissipation is unlikely to cause heat sensitization for heat, radical scavenger absorbs after luminous energy under aerobic state, be oxidized to corresponding NO free radical, stable NO free radical not only can be caught timber light and be decomposed the alkyl diradical inhibition photooxidation reaction producing, reach the stable object of light, and there is power of regeneration in light stabilization process, thereby stoped surface ultraviolet ray ager process in use procedure, wood-based plate surface is played a protective role.

Accompanying drawing explanation

Fig. 1 is process flow diagram of the present invention.

The specific embodiment

In order to make objects and advantages of the present invention clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.

As shown in Figure 1, a kind of weatherability bamboo and wood matter wood-based plate and manufacture method thereof, concrete steps are as follows:

Step 1: in proportion 0.5-1.5% ultra-violet absorber (UVA) and 0.8-2.0% radical scavenger are carried out to mixed dissolution with a small amount of distilled water, add in proportion appropriate low molecule phenolic resins, stir and mix, obtain solvent orange 2 A;

Step 2: at normal temperatures and pressures, wood-based plate skin-material is put into solvent orange 2 A, thorough impregnation 2-6 hour, dry under normal temperature after taking out, to moisture content be 7-11%;

Step 3: by the wood-based plate top layer of gained in step 2 and wood-based plate basic unit assembly, hot pressing, unload plate and cutting edge, obtain finished product.

Wherein, described ultra-violet absorber (UVA) is O-hydroxyl-diphenyl ketone class, and for white is to faint yellow powder, long chain alkane group that can be miscible with macromolecule by connection on O-hydroxyl-diphenyl ketone parent improves, and it is had water-soluble.This aqueous ultraviolet absorbent good water solubility, is faint yellow high transparency liquid after water-soluble, has high absorption efficiency, absorbing wavelength is at 290-390nm, to light, Heat stability is good, be difficult for corrupt, life cycle is long, extremely low working concentration, high absorbent properties.

Embodiment 1

By low molecule phenolic resins (molecular weight: 500-800, viscosity: 15mPas, solids content 38%, concentration dilution to 30% is stand-by), add 2% O-hydroxyl-diphenyl ketone ultra-violet absorber, 1% radical scavenger, stir and mix, at normal temperatures and pressures, put into bamboo fibre veneer, dipping 4-6h takes out, be dried to moisture content 8-11%, heart layer material adopts conventional phenolic resins impregnation, resin added 12-16%, be dried to moisture content 8-11%, assembly, hot pressing (hot pressing pressure: 3.5-5.0MPa hot pressing temperature 150-165 ℃, temperature retention time 30-40min, cool time 20-35min, ), unload plate, cutting edge, obtain finished product.

Embodiment 2

In modified urea-formaldehyde resin (viscosity: 30mPas, solids content 35%), add 0.8% O-hydroxyl-diphenyl ketone ultra-violet absorber, 1% radical scavenger and 0.5% paraffin, stir and mix.At normal temperatures and pressures, put into board using poplar board, dipping 2-4h, is dried to moisture content 7-10%, and intermediate layer board using poplar board is dried to moisture content 7-10%, gluing (glue-spread 250-350g/m ²), assembly, displays, and hot pressing (hot pressing pressure: 0.8-1.2MPa, hot pressing temperature 110-115 ℃, temperature retention time 10-15min), unloads plate, cutting edge, obtains finished product.

The physical and mechanical property of the weather-proof recombining bamboo of table 1 (density: 1.15g/cm ³)

The physical and mechanical property of the weather-proof recombining bamboo of table 2 (density: 1.15g/cm ³)

In sum, as shown in table 1, table 2, the present invention can play prevention or slow down the ager process of wood-base fibre and particle panel material on the basis of physical and mechanical property that does not affect product, and the effect that extends its service life, increases value-added content of product.

The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.

Claims (2)

1. weatherability bamboo and wood matter wood-based plate and a manufacture method thereof, is characterized in that, concrete steps are as follows:

Step 1: in proportion 0.5-1.5% ultra-violet absorber (UVA) and 0.8-2.0% radical scavenger (HALS) are carried out to mixed dissolution with a small amount of distilled water, add in proportion appropriate low molecule phenolic resins, stir and mix, obtain solvent orange 2 A;

Step 2: at normal temperatures and pressures, wood-based plate skin-material is put into solvent orange 2 A, thorough impregnation 2-6 hour, dry under normal temperature after taking out, to moisture content be 7-11%;

Step 3: by the wood-based plate top layer of gained in step 2 and wood-based plate basic unit assembly, hot pressing, unload plate and cutting edge, obtain finished product.

2. a kind of weatherability bamboo and wood matter wood-based plate according to claim 1 and manufacture method thereof, is characterized in that, described ultra-violet absorber (UVA) is O-hydroxyl-diphenyl ketone class.

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