Reconstituted bamboo board and preparation method thereof

A technology for recombining bamboo boards and bamboo materials, which is applied in the direction of manufacturing tools, mechanical equipment, wood processing utensils, etc., can solve the problem that the alternative method of adhesive selection has not been paid attention to, and achieve good corrosion resistance, high early strength, and safe use. Effect

Inactive Publication Date: 2018-11-13

BEIJING FORESTRY UNIVERSITY

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AI-Extracted Technical Summary

Problems solved by technology

[0005] At present, the research on improving the performance of recombinant bamboo mainly focuses on the treatment technology of bamboo body or the modification method of adhesive, so that one or several propert...

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Abstract

The invention discloses a preparation method of a reconstituted bamboo board and reconstituted bamboo prepared through the method. After bamboo wood is disposed in inorganic adhesives for impregnation, assembly and pressing treatment are carried out successively, the reconstituted bamboo is obtained, and the inorganic adhesives are formed by mixing geopolymers, stimulation solutions and modifiersin sequence. The geopolymers are used as the novel inorganic adhesives of the reconstituted bamboo prepared by adopting the method and play the effects of adhesives, fire-proofing agents and water-proofing agents, composite modifiers are added, and meanwhile the combination of the reinforcing and toughening of a matrix and the capacity expansion of bamboo wood glue joint interfaces is realized. The reconstituted bamboo has excellent mechanical properties, excellent water resistance, fire resistance and durability, has remarkable production, energy conservation and emission reduction effects, and is green and environment friendly. The technology is beneficial for efficient utilization of the bamboo wood and kaolin resources.

Application Domain

Non-macromolecular adhesive additivesCane mechanical working +3

Technology Topic

ChemistryAdhesive +7

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Examples

Experimental program(4)

Example Embodiment

[0065] Example 1

[0066] 1) Bamboo unit preparation

[0067] Cut the moso bamboo into bamboo tubes, cut out bamboo bundles with a length of 350mm (according to the size of the existing moulding equipment) after disintegration; then dry the bamboo bundles, where the drying temperature is (105±5)℃, and the moisture content is 8% (usually 5%-40%) of dry bamboo bundle units.

[0068] 2) Preparation of inorganic adhesive

[0069] 2-1) First, prepare an alkaline excitation solution, blend liquid sodium silicate with a modulus of 1.5 (usually 1-3.5) and a NaOH solution with a concentration of 10 mol/L (usually 1-30 mol/L) to prepare After the mixed solution is cooled to room temperature, let it stand for 20h (usually 20-36h) to make an alkaline excitation solution, standby, liquid Na 2 SiO 3 The volume ratio with NaOH solution is 2.5:1 (usually 1-5:1);

[0070] In the embodiment of the present invention, the NaOH solution is taken as an example as an alkaline solution and mixed with liquid sodium silicate to prepare an alkaline excitation solution. In addition to the NaOH solution, other alkaline solutions such as Na 2 CO 3 Solution, LiOH solution, KOH solution, K 2 CO 3 All alkaline solutions are suitable for the present invention.

[0071] 2-2) Put metakaolin and alkali stimulating liquid in a cement mortar mixer, mix well, and then add 1% modifier kh-550 silane coupling agent, and then perform high speed under the condition of rotating speed of 1400r/min Shear and stir to make an inorganic adhesive, in which the mass ratio of metakaolin to alkaline excitation solution is 0.7:1 (usually 0.5-0.8:1); the addition of modifier is 1% (usually 1%-30) %), that is, the mass ratio of modifier to metakaolin is 1:100, and the solid content of the prepared inorganic adhesive is 70%.

[0072] The modifier is mixed with the geopolymer first, and the stirring is not uniform; first is mixed with the alkali excitation liquid, which is prone to agglomeration. Therefore, the geopolymer is first mixed with the alkali excitation liquid, and then mixed with the modifier to obtain a homogeneous inorganic Adhesive.

[0073] In the embodiment of the present invention, the modifier is illustrated by taking kh-550 silane coupling agent as an example. Other silane coupling agents are suitable for the present invention, such as kh-560 silane coupling agent or kh-570 silane coupling agent. The geopolymer is described with metakaolin as an example, and other geopolymers such as fly ash, slag or coal gangue are all suitable for the present invention.

[0074] 3) Dipping

[0075] Put the dried bamboo bundles in an inorganic adhesive, dipping, and dipping under normal pressure for 10 minutes (usually 1-30 minutes); the amount of dipping is 30% (usually 10%-50%).

[0076] 4) Billet assembly

[0077] The dipped bamboo bundles are assembled into blanks with a fixed width layer by layer along the grain. When forming the blanks, the slab quality is calculated according to the design density of the prepared reorganized bamboo board. In the embodiment of the present invention, the density of the designed reorganized bamboo board is 1.0g /cm 3 As an example, spread the dipped bamboo bundles evenly and loosely into a slab;

[0078] 5) Suppression treatment

[0079] The pavement slab is subjected to cold pressing treatment, where the control pressure is 3 MPa (usually 1-10 MPa), the temperature is 25 °C, and after the cold pressing treatment for 2 minutes, the pressure is maintained at 3 MPa, and then kept at room temperature. Pressure treatment for 2 days (usually 1-5 days);

[0080] 6) Curing, sanding, trimming

[0081] After the press is relieved of pressure, it is allowed to stand at room temperature for 5 days (usually 1-28 days), that is, curing treatment is carried out for 5 days; then the slab after curing treatment is sanded, trimmed, etc. to obtain the present invention The geopolymer-based reconstituted bamboo board.

[0082] The physical and chemical performance test methods of wood-based panels and decorative wood-based panels GBT 17657-2013 and the physical and chemical performance indicators of outdoor reorganized bamboo flooring in the national standard "Reconstituted Bamboo Flooring" are used to determine the static bending strength (MOR) and modulus of elasticity (MOE) of the prepared reorganized bamboo. ), internal bonding strength (IB), water absorption thickness swelling rate and anti-mold performance were tested, and the measurement results are shown in Table 1.

Example Embodiment

[0083] Example 2

[0084] 1) Bamboo unit preparation

[0085] Saw the moso bamboo into bamboo tubes, cut out bamboo filaments with a length of 350mm (according to the size of the existing molding tool) after disintegration; then dry the bamboo filaments, where the drying temperature is (105±5)℃, and the moisture content is 10% (usually 5%-40%) of dry bamboo silk units.

[0086] 2) Preparation of inorganic adhesive

[0087] 2-1) First, prepare an alkaline excitation solution, blend liquid sodium silicate with a modulus of 1.4 (usually 1-3.5) and a NaOH solution with a concentration of 11mol/L (usually 1-30mol/L) to prepare After the mixture is cooled to room temperature, let it stand for 24h (usually 20-36h) to make an alkaline excitation solution, standby, liquid Na 2 SiO 3 The volume ratio to NaOH solution is 2.6:1 (usually 1-5:1);

[0088] 2-2) Put metakaolin and alkali activator in a cement mortar mixer, mix well, then add 6% modifier ethylene-vinyl acetate copolymer hot melt adhesive powder, and then rotate at 700r/min Under high-speed shearing and agitation, the inorganic adhesive is made, in which the mass ratio of metakaolin to alkali excitation solution is 0.6:1 (usually 0.5-0.8:1); the addition of modifier is 6% (usually 1 -30%), that is, the mass ratio of modifier to metakaolin is 6:100, and the solid content of the prepared inorganic adhesive is 65%.

[0089] 3) Dipping

[0090] Put the dried bamboo bundles in an inorganic adhesive, dipping, and dipping under normal pressure for 15min (usually 1-30min); the amount of dipping is 40% (usually 10%-50%).

[0091] 4) Billet assembly

[0092] The dipped bamboo bundles are assembled according to the pattern and the width is fixed layer by layer, and the quality of the slab is calculated according to the designed density of the prepared reorganized bamboo board during the assembly. In the embodiment of the present invention, the density of the designed reorganized bamboo board is 0.8g /cm 3 As an example, spread the dipped bamboo bundles evenly and loosely into a slab;

[0093] 5) Suppression treatment

[0094] Carry out cold pressing treatment on the pavement slab, where the control pressure is 10MPa (usually 1-10MPa), the temperature is 30℃ (usually -10-40℃), and the cold pressing treatment is 5min (usually 1-10min) Afterwards, under the condition of maintaining the pressure at 10MPa, the temperature is raised and maintained at 60°C, and the pressure maintaining treatment is carried out for 4h (usually 1-24h);

[0095] 6) Curing, sanding, trimming

[0096] After the press is relieved of pressure, the slab is cooled to 40°C (usually below 50°C) and allowed to stand for 7 days (usually 1-28 days), that is, curing treatment is carried out for 7 days; then the curing treatment of the slab is carried out Sanding, trimming, etc., to prepare the geopolymer-based reconstituted bamboo board of the present invention.

[0097] The physical and chemical performance test methods of wood-based panels and decorative wood-based panels GBT 17657-2013 and the physical and chemical performance indicators of outdoor reorganized bamboo flooring in the national standard "Reconstituted Bamboo Flooring" are used to determine the static bending strength (MOR) and modulus of elasticity (MOE) of the prepared reorganized bamboo. ), internal bonding strength (IB), water absorption thickness swelling rate and anti-mold performance were tested, and the measurement results are shown in Table 1.

Example Embodiment

[0098] Example 3

[0099] 1) Bamboo unit preparation

[0100] Cut the moso bamboo into bamboo tubes, cut bamboo strips with a length of 350mm after disintegration; then dry the bamboo strips, where the drying temperature is (105±5)℃, and the moisture content of the dried product is 8% (usually 5%- 40%) of the dry bamboo strip unit.

[0101] 2) Preparation of inorganic adhesive

[0102] 2-1) First, prepare an alkaline excitation solution, blend liquid sodium silicate with a modulus of 1.3 (usually 1-3.5) and a NaOH solution with a concentration of 20mol/L (usually 1-30mol/L) to prepare After the mixed solution is cooled to room temperature, let it stand for 28h (usually 20-36h) to make an alkaline excitation solution, standby, liquid Na 2 SiO 3 The volume ratio with NaOH solution is 3:1 (usually 1-5:1);

[0103] 2-2) Put metakaolin and alkali activator in a cement mortar mixer, mix well, then add 8% modifier acrylic 707 emulsion, and then perform high-speed shearing and stirring at a speed of 1400r/min. Made into an inorganic adhesive, in which the mass ratio of metakaolin to alkaline excitation solution is 0.6:1 (usually 0.5-0.8:1); the addition of modifier is 8% (usually 1%-30%), namely The mass ratio of modifier to metakaolin is 8:100, and the prepared inorganic adhesive has a solid content of 63%.

[0104] In the embodiment of the present invention, the modifier is described by taking acrylic 707 emulsion as an example. Other acrylic emulsions such as pure acrylic emulsion, silicone acrylic emulsion, and vinegar acrylic emulsion are all suitable for the present invention.

[0105] 3) Dipping

[0106] Put the dried bamboo bundles in an inorganic adhesive, dipping, and dipping under normal pressure for 12 minutes (usually 1-30min); the amount of dipping is 35% (usually 10%-50%).

[0107] 4) Billet assembly

[0108] The dipped bamboo bundles are assembled into blanks with fixed width layer by layer along the grain. When forming the blanks, the slab quality is calculated according to the design density of the prepared reorganized bamboo boards. In the embodiment of the present invention, the density of the designed reorganized bamboo boards is 0.9g. /cm 3 As an example, spread the dipped bamboo bundles evenly and loosely into a slab;

[0109] 5) Suppression treatment

[0110] Carry out cold pressing treatment on the pavement slab, in which the control pressure is 2MPa (usually 1-10MPa), the temperature is 35°C, and after the cold pressing treatment for 2min, the temperature is increased and maintained at 80 under the condition of maintaining the pressure of 2MPa Under the condition of ℃, the pressure keeping treatment is 8h (usually 1-24h);

[0111] 6) Curing, sanding, trimming

[0112] After the press is relieved of pressure, the slab is cooled to 50°C (usually below 50°C) and allowed to stand for 7 days (usually 1-28 days), that is, curing is performed for 7 days; then the cured slab is processed Sanding, trimming, etc., to prepare the geopolymer-based reconstituted bamboo board of the present invention.

[0113] The physical and chemical performance test methods of wood-based panels and decorative wood-based panels GBT 17657-2013 and the physical and chemical performance indicators of outdoor reorganized bamboo flooring in the national standard "Reconstituted Bamboo Flooring" are used to determine the static bending strength (MOR) and modulus of elasticity (MOE) of the prepared reorganized bamboo. ), internal bonding strength (IB), water absorption thickness swelling rate and anti-mold performance were tested, and the measurement results are shown in Table 1.

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PUM

Property	Measurement	Unit
Density	1.0	g/cm³
Density	0.8	g/cm³
Density	0.9	g/cm³
tensile		MPa
Particle size		Pa
strength	10

Description & Claims & Application Information

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the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

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Classification and recommendation of technical efficacy words

Improve early strength
Good mechanical properties

Reconstituted bamboo board and preparation method thereof

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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