CN101642923B - Method for manufacturing bamboo macrofiber composite material - Google Patents
Method for manufacturing bamboo macrofiber composite material Download PDFInfo
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- CN101642923B CN101642923B CN200810041524XA CN200810041524A CN101642923B CN 101642923 B CN101642923 B CN 101642923B CN 200810041524X A CN200810041524X A CN 200810041524XA CN 200810041524 A CN200810041524 A CN 200810041524A CN 101642923 B CN101642923 B CN 101642923B
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Abstract
The invention relates to a method for manufacturing a bamboo macrofiber composite material. Bunchy bamboo fibers of which the green and yellow are removed are taken as raw materials and dipped with a water soluble phenol formaldehyde adhesive, and the production steps comprise material preparation (comprising the preparation of bamboo macrofiber reinforcement and a water soluble phenol formaldehyde resin matrix), adhesive dipping, extraction, warm-pressing, curing and post curing. The method has the advantages that: (1) the method has reasonable process, strong production continuity, high efficiency, low energy consumption, and no environmental pollution; (2) the manufactured bamboo macrofiber composite material has no mold and no crack, and has the density between 0.9 and 1.3g/cm<3>, thehardness between 60 and 150MPa, the static bending strength between 140 and 160MPa, the water-absorbing expansion rate between 0.3 and 2 percent, the surface wear resistance between 0.04 and 0.09g/100r, and the formaldehyde emission between 0.1 and 0.4mg/L; and (3) the invention provides a more positive production technique for reasonably utilizing the bamboo resources, so that the reconstituted bamboo timber application prospect is better.
Description
[technical field]
The present invention relates to the processing technique field of timber or similar material, relate in particular to the manufacturing of wood-based plate, specifically, is a kind of manufacture method of utilizing bamboo to carry out the bamboo macrofiber composite material section bar.
[background technology]
Because the minimizing of the forest reserves and to the restriction of disafforestation, timber resources day is becoming tight.In order to alleviate the nervous situation of timber resources, reach the purpose of protecting environment preferably, it is practicable utilizing growth cycle is short, material capability is good bamboo to substitute timber.
At present, the various product of bamboo manufacturing and the new production technologies utilized emerge in an endless stream, and the appearance of reorganization bamboo makes the human level of utilizing to bamboo reach a new height.Existing reorganization bamboo technology has Chinese patent ZL99117809.2 disclosed " method of recombining bamboo material into reinforced shapes ", and it is that mao bamboon is split into the bamboo silk, and section bar is suppressed and be solidified into to impregnation dress mould after drying through high pressure (10-100Mpa) again.Also has Chinese patent ZL0210518.3 disclosed " reorganization bamboo plywood manufacture method ", dwarf bamboo gone to be rolled into laterally behind the blue or green subdivision do not rupture, the vertically loose and staggered bamboo bundle that links to each other, do not upset the bamboo fibre orientation, form through super-dry, impregnation, assembly and hot pressing again.The reorganization bamboo has overcome the shortcoming that bamboo does not become " material ", makes bamboo also can obtain utilizing as wooden boards.
The reorganization bamboo that prior art is produced has sufficiently and reasonably utilized the inherent characteristic of bamboo fiber, has both guaranteed the high usage of bamboo wood, has kept the original physical and mechanical property of bamboo wood again, and its density is 0.9g/cm
3The time, MOR can reach 89Mpa (vertically) and 59Mpa (laterally), and impact strength can reach 92KJ/m
2, substantially exceeded other timber wood-based plate and common artificial bamboo board, can satisfy the requirement that structural wood uses, be widely used in the ground board industry.There is more factory to be engaged in the production on reorganization bamboo floor at present.
But the reorganization bamboo is as a kind of new material product and since its production technology not full maturity can cause the generation of some problems unavoidably, at first, the phenomenon appearance of going mouldy and ftracture is arranged.According to customs's introduction, because quality problems such as go mouldy in reorganization bamboo floor, cracking have considerable return of goods phenomenon in recent years.A large amount of return of goods have greatly hit the confidence of market to reorganization bamboo product on the one hand, have hindered the development of reorganization bamboo industry; On the other hand, how to overcome that reorganization bamboo product easily goes mouldy, phenomenon easy to crack becomes the task of top priority.
Secondly, existing production technology exists contaminated environment and the excessive problem of power consumption.
The glue-applying technique of prior art production reorganization bamboo is used the mode of impregnation more, and then dry, both the solvent adhesive solvent.In this process, the solvent that contains harmful substance such as a large amount of free aldehyde becomes gas and is dispersed in the air by drying the oven dry means, has greatly destroyed environment all round, serious harm workman and resident's health.
The pressing mode that prior art is produced the reorganization bamboo has two kinds, a kind of is cold-press process, as described in Chinese patent ZL99117809.2, its high-pressure that adopts is 10～100Mpa, preferably more than 50Mpa, adopt so high pressure, the tonnage demand of press than higher, is 0.2m as producing the 2000MM*100MM pressure surface
2Material, requiring production density with the pressure of 75Mpa is 1.1g/cm
3Material, the tonnage demand of press is more than 1800 tons, this has directly improved the cost of investment of producing the reorganization bamboo, and the pressure surface specification of reorganization bamboo product also is limited in the scope of little length, adopts so high pressure, power consumption is very big.Another kind is a heat pressing process, as described in Chinese patent ZL02120518.3, when adopting phenolic resins, its thermal pressure is 3Mpa, and hot pressing temperature is 140 ℃, and hot pressing time is the 1.0min/mm thickness of slab, though the used pressure of hot pressing mode is 3Mpa, can produce the material of big length pressure surface, but the used time is longer, relative also just big of energy consumption.
Once more, the production stage of prior art has improvable place.For example, it is to adopt the mode of drying that prior art is produced the drying of reorganization bamboo before compacting, and as described in Chinese patent ZL99117809.2, this needs the long time, and poor controllability, and the scale industry of the bamboo that is not suitable for recombinating is produced.Present manufacturing enterprise generally adopts the mode of oven dry, repressed again, curing, and this middle phenomenon that has energy waste, power consumption also is very large.
In sum, the reorganization bamboo product that prior art is produced have easily go mouldy, defective easy to crack, have excessive problem of contaminated environment and power consumption or the like aborning, these are current reorganization bamboo industry urgent problems.
[summary of the invention]
The objective of the invention is to overcome the deficiencies in the prior art, at reorganization bamboo product easily go mouldy, defective easy to crack, at easy contaminated environment, the excessive problem of power consumption in its production process, provide that a kind of technology is reasonable, production efficiency is high, power consumption is low, the manufacture method of non-environmental-pollution, the bamboo macrofiber reinforcing material of its production is difficult for going mouldy, not easy to crack, intensity is better.
For realizing above purpose, the technical scheme that the present invention takes is:
A kind of manufacture method of bamboo macrofiber composite material section bar, its production stage comprises:
(1) raw material is prepared
A, bamboo macrofiber strengthen the preparation of body
A-1 blocks the thick bamboo tube isometric with bamboo macrofiber composite material with bamboo, cuts into the bamboo chip that width is 20～50mm open with machinery, removes the green grass or young crops (epidermis of bamboo) and the Huang (bamboo chamber wall) of bamboo chip again and is rolled into the pencil bamboo fibre;
A-2, to go green grass or young crops to go pencil bamboo fibre behind the Huang to be placed on to contain in 0.5～2% the sodium hydroxide solution, heat to 60～90 ℃, soak and soak half an hour with clear water again after 2～3 hours, get hemicellulose and pectin content and account for the pencil bamboo fibre of fabric integer below 12%;
A-3 accounts for the pencil bamboo fibre of fabric integer below 12% with hemicellulose and pectin content and is placed on digestion in the color pond, takes out after modulating required color;
As product color is not had specific (special) requirements and can save the A-3 step;
Require to coffee-like as product colour, can be in carbide furnace carbonization to substitute the A-3 step;
As product color is required to be true qualities, can be placed in 1～2% hydrogen peroxide solution digestion 2～4 hours to substitute the A-3 step;
A-4, the above pencil bamboo fibre of handling well is dried to moisture content under 60～100 ℃ of temperature be 8～12%, ties up with equal portions weight after go-no-go;
The preparation of B, water-soluble phenolic resin adhesive
Prepare water-soluble phenolic resin adhesive in reactor, the mol ratio of phenol, formaldehyde is 1: 1.25～1.50, and the molecular resin amount that makes adhesive is 100～400, and solid content is 18～25%, is 0.1～0.3Pas at 25 ℃ of following viscositys; Water-soluble phenolic resin adhesive is placed in the impregnation pond;
Described water soluble phenol resin is for adding the Modified Water Soluble Phenolic Resin of function ingredients;
(2) impregnation
The pencil bamboo fibre of tying up is put into the impregnation basket, winched in the impregnation pond impregnation 5～15 minutes, realize the infiltration of water-soluble phenolic resin adhesive, carry afterwards to drop glue platform drop glue 10～30 minutes to the pencil bamboo fibre with driving;
(3) extract
The pencil bamboo fibre that contains glue behind the drop glue is put in the vacuum chamber, heat and the extracting vacuum, in the bamboo fibre temperature reaches 40～80 ℃, room vacuum less than the condition of 50KPa under extracting contain the moisture that contains free phenol, free aldehyde in the micellelike bamboo fibre, make the bamboo fibre moisture content remain on 8～15%;
(4) temperature and pressure
With temperature in the extraction step be between 70～80 ℃, moisture content is the feed system that weight that 8～15% pencil bamboo fibre needs by composite density is put into hydraulic press, by feed system the pencil bamboo fibre is moved into die cavity, suppress, pressure is 3～30MPa;
Preferable pressure is 6～9Mpa.
(5) solidify
Behind the temperature and pressure, will be cured immediately through the pencil bamboo fiber products of compacting, the temperature of pencil bamboo fiber products continues to heat to 125～135 ℃ to it, and keeps making in 2～4 hours its curing between 70～80 ℃ at this moment;
(6) solidify the back
With in the warehouse, displaying 7～15 days after the pencil bamboo fiber products demoulding after solidifying, finish the back solidification process that discharges internal stress, promptly become the bamboo macrofiber composite material section bar after 7～15 days, its physical and mechanical property is: density is 0.9～1.3g/cm
3, hardness is 60～150MPa, and MOR is at 140～160MPa, and expansion rate of water absorption is 0.3～2%, and surface abrasion resistance is 0.04～0.09g/100r, burst size of methanal is 0.1～0.4mg/L.
Manufacture method of the present invention, owing to removed surf green tabasheer part, overcome because the problem that the surface tension reason adhesive of surf green tabasheer can't permeate, adhesive has reached homogeneity to dipping, the infiltration of bamboo fibre, reduce the reorganization bamboo and formed the uneven situation of fiber adhesive strength, overcome the defective of cracking.And bamboo pencil form makes the maximization of bamboo fibre contact adhesive surface area, helps the infiltration of adhesive to bamboo fibre, and bamboo fibre moving in the whole production flow process do not constituted influence.
Manufacture method of the present invention, a unit component of synthetic are the pencil bamboo fibres of handling through past hemicellulose, pectin composition.The chemical composition of bamboo fibre mainly comprises the mineral salts of cellulose, hemicellulose, lignin, pectin and trace etc., and wherein, cellulose and lignin account for about 80% of integral body, are the components of synthetic unit component; Hemicellulose is some low-molecular-weight glycan compounds, mainly contains poly pentose and hexasaccharide and forms, and its molecular weight is little, the degree of polymerization is little, chemical property is very unstable, is Powdered in fiber, and the water absorbing properties more much higher than cellulose arranged; And pectin is a kind of acid sugar that mixes that has, be distributed between the fibrocyte and fibrocyte and non-fibrocyte between, and be filled in some spaces of primary wall; The existence of hemicellulose and pectin is the essential condition that reorganization bamboo product goes mouldy.These small molecular weight material play a part bonding in original bamboo fibre, and its bonding force is not enough to far to offset that reorganization bamboo product is subjected to high pressure and the mechanical stress that forms adds the hydrophilicity that hemicellulose is fabulous, is reorganization bamboo product another main cause easy to crack.Because hemicellulose has very unsettled chemical property, pectin is the material that contains the specific admixture chain formation of uronic acid unit, in dilute alkaline soln, be easy to be removed, the present invention adopts the method that adds a small amount of diluted alkaline boiling to remove hemicellulose and pectin composition in the bamboo fibre, the bamboo fibre that is utilized after the processing does not contain or contains less hemicellulose and pectin composition material, treated bamboo fibre can remake toning according to the needs in market and handle, make a unit component of reorganization bamboo synthetic thus, overcome the bamboo product of recombinating in the prior art and easily gone mouldy, defective easy to crack.In addition,, make adhesive more abundant, guaranteed the quality of reorganization bamboo product the infiltration of bamboo fibre because above-mentioned processing makes the void space that reaches between the fibrocyte in the cell membrane increase and increase.
Manufacture method of the present invention, its essence is of the processing of raw material bamboo fiber bundle through past hemicellulose and pectin composition, make the void space that reaches in the cell membrane between inner cell of bamboo fibre and the cell increase and increase, make water-soluble phenolic resin adhesive be penetrated into these void spaces effectively by solvent, again by the bamboo fibre after the solvent water volatilization is carried out high pressure compacting and hot setting, make the molecule crosslinked one-tenth of phenolic resins have the insoluble not molten three-dimensional-structure of suitable intensity, fiber is linked together securely network-likely, and the fiber gap after these processing, what have is nail-like, shape is colluded in being of having, taper is dispersed in being of having, the void shape that has is often very complicated, also extending little space in the big space, as tree root, water-soluble phenolic resin adhesive solidifies the back and produce powerful mechanical bond power in these space, the picture nail, the picture hook, the picture tenon, as tree root, form firm adhesion, the physical and mechanical property of reorganization bamboo product is remained on: density is at 0.9～1.3g/cm
3Between, hardness is between 60～150MPa, and MOR is between 140～160MPa, and expansion rate of water absorption is between 0.3～2%, and surface abrasion resistance is between 0.04～0.09g/100r, and burst size of methanal is between 0.1～0.4mg/L.
Manufacture method of the present invention; according to inventor's years of researches and practice; for solving contaminated environment and the excessive problem of power consumption that prior art exists; and help scale standard production; the technical solution of taking is: the bamboo fibre of handling well is positioned in the impregnation basket; be hung with driving and realize the infiltration of water-soluble phenolic resin adhesive in the impregnation pond bamboo fibre; be positioned in the vacuum tank again behind the drop; be lower than 80 ℃ in the bamboo fibre temperature; vacuum contains free phenol less than extracting to contain in the glue bamboo fibre under the condition of 50KPa in the container; the moisture of free aldehyde material; this technical process; make and contain glue bamboo fibre moisture content and reach 8～15%; the temperature of this moment should remain between 70～80 ℃; reach after this technology purpose; can adorn mold pressing system to bamboo fibre; adopt the mode of temperature and pressure compacting; moisture content is 8～15%; bamboo fibre between 70～80 ℃ of the temperature is to realize moulding under the situation of 3～30MPa at pressure; reorganization bamboo after the moulding is to finish curing under 125～135 ℃ the condition in temperature, solidifies after the demoulding after deposit was finished in 7～15 days.
Manufacture method of the present invention, adopt in the vacuum extraction adhesive that the mode of water is environmental protection in the harmful substance such as free phenol, free aldehyde and solvent flashing, adopt the mode of drying to make a large amount of harmful substances such as free aldehyde distribute in air harm workman's and peripheral resident health than prior art and will get well a lot.The present invention has accomplished the extraction of harmful substances such as free phenol, free aldehyde is reclaimed, and can utilize again---the moisture that contains free phenol, free aldehyde material that will extract is stored in the water of making glue next time in the hold-up tank, joining glue through cooling, both provided cost savings, controlled because of solvent distributes the loss that causes, made surrounding enviroment avoid pollution again.
Water-soluble phenolic resin adhesive is the phenolic resins on first rank, after temperature arrives 80 ℃, its polycondensation reaction will be accelerated, and water its temperature in vaporescence is directly proportional with vapour pressure, mode that the present invention adopts has realized under the cryogenic conditions volatilization to water, this state for the control A-stage resin is favourable, also makes the adhesive strength of adhesive that assurance has been arranged.
In this processing step, indoor pressure is lower than atmospheric pressure all the time, and molecular weight gas is few, density is low, contain the low effect of playing sterilization of oxygen rate.The influence of growing reorganization bamboo product quality of mould is very large, and prior art was not carried out sterilization treatment to raw material from start to finish, its mode of drying of taking has greatly improved the chance that mould grows again, has stayed hidden danger for later the going mouldy of reorganization bamboo product.Therefore, this technology of the present invention is reasonable, feasible, effective, and it had both controlled the reaction process of A-stage resin, has controlled the microbiological contamination chance of product again, multipurpose such as realized environmental protection, quality control and save time.
With 10～100MPa, preferably the pressure more than the 50MPa is very energy-conservation to the mode that manufacture method of the present invention adopts 3～30MPa pressure temperature and pressure with respect to prior art.The rigidity of bamboo fibre is bigger, prior art adopts is drying mode under the normal pressure, spread in the fluid boundary course air that the steam of vaporization of being heated forms by bamboo fibre surface, the bamboo fibre internal moisture will move to the surface, if its speed that moves is unable to catch up with the evaporation rate on surface, boundary layer, the boundary layer moisture film will break, local dry and cracked phenomenon will appear in the bamboo fibre surface, expand whole outer surface then to, form the surface sclerosis, increased the rigidity of bamboo fibre before the compacting again greatly.And the present invention adopts the moisture evaporation mode under the vacuum condition, and owing to the pressure differential between in the bamboo fibre and the surface is bigger, under the effect of barometric gradient, moisture is shifted to the surface very soon, the surface sclerosis can not occur.In addition, because temperature remained between 70～80 ℃ when bamboo fibre was pressed, between the moisture content 8～15%, under this physical condition, the flexibility of bamboo fibre is extraordinary, so the pressure that when compacting uses is just smaller, 3～30MPa pressure is just much of that, preferably in the scope of 6～9MPa, can reduce energy consumption widely during compacting.And it has broken through the restriction of press tonnage to product pressure surface specification, as with press tonnage of the prior art, with same pressure, just can produce greater than the several-fold reorganization of prior art bamboo pressure surface specification, output also will increase several times, and production capacity and usefulness significantly increase.
Manufacture method of the present invention, the mode that adopts vacuum and temperature and pressure to combine, and suppressing back enforcement curing at once, and three step continuitys are strong, and linking degree height accomplishs without any letup, and has saved a large amount of energy to the full extent.Containing the glue bamboo fibre is heated in vacuum chamber and is remained between 70～80 ℃, just carry out temperature and pressure immediately, be cured behind the temperature and pressure at once, bamboo fibre temperature during temperature and pressure is not waste basically, solidify and also on this temperature, to continue to heat, not only do not waste energy and shortened the time of solidifying.And prior art, contain the glue bamboo fibre after drying because the inhomogeneous needs of moisture content are displayed transfers all, and because the dry used time is long, scale can not be accomplished successional the butt joint with pressing process greatly, being contained the glue bamboo fibre by pressure often needs to display for a long time, the temperature of temperature when being dried reduced to room temperature, need restart when being cured then the bamboo fibre under the room temperature is heated, this need spend the more energy and time.Both contrasts, energy-saving effect highly significant of the present invention.
Manufacture method of the present invention, the continuity of each flow process is strong in the production stage, and linking degree height can be realized scale standard production.As weighing as the output bottleneck to account for ratio between investments press over half in the equipment: production specification is the product of 2500 * 200 * 200mm, a press per tour can be produced 100 reorganization bamboo profiles in 8 hours, consume the bamboo fibre raw material of doing and to reach 10 tons more than, amount to former bamboo (with average 25 kilograms of calculating, surf green is done comprehensive utilizations such as bamboo mat, bamboo curtain splint) reach more than 1600 bamboos, can produce the nearly 600m in the thick floor of 15mm
2This output and bamboo of the prior art utilize level relatively, are considerable scale, and the social benefit that produces also is significant.
Good effect of the present invention is:
(1) provide that a kind of technology is reasonable, production efficiency is high, power consumption is low, the manufacture method of the bamboo macrofiber composite material section bar of non-environmental-pollution, and the production procedure continuity is strong, linking degree height, can realize scale standard production.
(2) the bamboo macrofiber composite material section bar of producing by the present invention be difficult for going mouldy, not easy to crack, intensity is better.
(3), make the application prospect of bamboo macrofiber composite material section bar (reorganization bamboo) more bright for sufficiently and reasonably utilizing bamboo resource that a kind of positive technical scheme is provided.
[specific embodiment]
Describe the manufacture method of a kind of bamboo macrofiber composite material section bar of the present invention in detail below in conjunction with performance.
Specification is the manufacture method of the reorganization bamboo product of 2500 * 200 * 200mm, and its production stage is:
(1) raw material is prepared
A, bamboo macrofiber strengthen the preparation of body
A-1 blocks into the long thick bamboo tube of 2500mm with bamboo, cuts into the bamboo chip that width is 40mm open with colliding again, goes the green grass or young crops (epidermis of bamboo) and Huang (penetrale of bamboo, the bamboo chamber wall) part of blue or green roller removal bamboo chip and is rolled into the pencil bamboo fibre with steel brush again;
A-2 heats to 80 ℃ in 0.8% the sodium hydroxide solution going green grass or young crops to go pencil bamboo fibre behind the Huang to be placed on to contain, soak and soak half an hour with clear water again after 2 hours, hemicellulose and pectin content account for the pencil bamboo fibre of fabric integer 8%;
A-3 is placed on digestion in the color pond with hemicellulose and the very low pencil bamboo fibre of pectin content, takes out after modulating required color;
As product color is not had specific (special) requirements and can save this step;
As product color is required to coffee-like, can be in carbonization in the carbide furnace to substitute this step: hemicellulose and the very low pencil bamboo fibre of pectin content are placed in the carbide furnace, under 3 kilograms of pressure, the condition of 2 hours time, bamboo fibre are carried out carbonization;
A-4, the above pencil bamboo fibre of handling well is dried to moisture content under 60 ℃ of temperature be 12%, after go-no-go with 20 kilograms of equal portions weight/tie up;
The preparation of B, water-soluble phenolic resin adhesive
Prepare water-soluble phenolic resin adhesive in reactor, the mol ratio of phenol, formaldehyde is 1: 1.25, and the resin mean molecule quantity that makes adhesive is 150, and solid content is 18%, is 300cPas at 25 ℃ of following viscositys; Water-soluble phenolic resin adhesive is placed in the impregnation pond;
(2) impregnation
With the above moisture content of handling well is that 12% pencil bamboo fibre is placed in the impregnation basket, winches in the impregnation pond impregnation with driving a vehicle and carries after 5 minutes and put drop glue platform drop glue 15 minutes;
(3) extract
The bamboo fibre that contains glue behind the drop glue is put in the vacuum chamber, heat and extracting vacuum, reach in the bamboo fibre temperature and to extract the moisture that contains free phenol, free aldehyde under 80 ℃, the condition of vacuum at 50KPa, extract is stored in the hold-up tank after cooling, and making the bamboo fibre moisture content remain on 13%, temperature remains on 80 ℃;
(4) temperature and pressure
Temperature in the vacuum chamber is reached 80 ℃, moisture content be placed on the feed system of hydraulic press in 13% bamboo fibre 5 bundles, finish the action that bamboo fibre is moved to die cavity by feed system, implement compacting, temperature and pressure pressure is 9Mpa;
(5) solidify
Pencil bamboo fiber products after the compacting is cured immediately, and the temperature of bamboo fibre continues to heat it to 135 ℃ between 70～80 ℃ at this moment, keeps 2 hours, makes its curing;
(6) solidify the back
To in the warehouse, display 15 days after the pencil bamboo fiber products demoulding after solidifying, solidify the final program that discharges internal stress after finishing; Promptly become the bamboo macrofiber composite material section bar after 15 days.
The physical and mechanical property of bamboo macrofiber composite material section bar is: density is 0.9～1.3g/cm
3, hardness is 60～150MPa, and MOR is at 140～160MPa, and expansion rate of water absorption is 0.3～2%, and surface abrasion resistance is 0.04～0.09g/100r, burst size of methanal is 0.1～0.4mg/L.
Claims (8)
1. the manufacture method of a bamboo macrofiber composite material section bar is characterized in that, its production stage comprises:
(1) raw material is prepared
A, bamboo macrofiber strengthen the preparation of body
A-1 blocks the thick bamboo tube isometric with bamboo macrofiber composite material with bamboo, cuts into the bamboo chip that width is 20～50mm open with machinery, removes the blue or green and yellow of bamboo chip again, and is rolled into the pencil bamboo fibre;
A-2, to go green grass or young crops to go pencil bamboo fibre behind the Huang to be placed on to contain in 0.5～2% the sodium hydroxide solution, heat to 60～90 ℃, soak and soak half an hour with clear water again after 2～3 hours, get hemicellulose and pectin content and account for the pencil bamboo fibre of fabric integer below 12%;
A-3 is placed on digestion in the color pond with hemicellulose and the very low pencil bamboo fibre of pectin content, takes out after modulating required color;
A-4, the above pencil bamboo fibre of handling well is dried to moisture content under 60～100 ℃ of temperature be 8～12%, ties up with equal portions weight after go-no-go;
The preparation of B, water-soluble phenolic resin adhesive
Prepare water-soluble phenolic resin adhesive in reactor, the mol ratio of phenol, formaldehyde is 1: 1.25～1.50, and the molecular resin amount that makes adhesive is 100～400, and solid content is 18～25%, is 0.1～0.3Pas at 25 ℃ of following viscositys; Water-soluble phenolic resin adhesive is placed in the impregnation pond;
(2) impregnation
The pencil bamboo fibre of tying up is put into the impregnation basket, winched in the impregnation pond impregnation 5～15 minutes, realize the infiltration of water-soluble phenolic resin adhesive, carry afterwards to drop glue platform drop glue 10～30 minutes to the pencil bamboo fibre with driving;
(3) extract
The pencil bamboo fibre that contains glue behind the drop glue is put in the vacuum chamber, heat and the extracting vacuum, in the bamboo fibre temperature reaches 40～80 ℃, room vacuum less than the condition of 50KPa under extracting contain the moisture that contains free phenol, free aldehyde in the micellelike bamboo fibre, make the bamboo fibre moisture content remain on 8～15%;
(4) temperature and pressure
With temperature in the extraction step be between 70～80 ℃, moisture content is the feed system that weight that 8～15% pencil bamboo fibre needs by composite density is put into hydraulic press, by feed system the pencil bamboo fibre is moved into die cavity, suppress, pressure is 3～30MPa;
(5) solidify
Behind the temperature and pressure, will be cured immediately through the pencil bamboo fiber products of compacting, the temperature of pencil bamboo fiber products continues to heat to 125～135 ℃ to it, and keeps making in 2～4 hours its curing between 70～80 ℃ at this moment;
(6) solidify the back
With in the warehouse, displaying 7～15 days after the pencil bamboo fiber products demoulding after solidifying, finish the back solidification process that discharges internal stress, promptly become the bamboo macrofiber composite material section bar after 7～15 days.
2. the manufacture method of bamboo macrofiber composite material section bar according to claim 1 is characterized in that, in the B of production stage (1), described water-soluble phenolic resin adhesive is for adding the Modified Water Soluble Phenolic Resin adhesive of function ingredients.
3. the manufacture method of bamboo macrofiber composite material section bar according to claim 1, it is characterized in that, in the extraction of production stage (3), the moisture that contains free phenol, free aldehyde of extracting is stored in the hold-up tank through cooling, make glue next time, join the water of glue.
4. the manufacture method of bamboo macrofiber composite material section bar according to claim 1 is characterized in that, the bamboo macrofiber composite material section bar of after solidify production stage (6) back, finishing, and its physical and mechanical property is: density is 0.9～1.3g/cm
3, hardness is 60～150MPa, and MOR is at 140～160MPa, and expansion rate of water absorption is 0.3～2%, and surface abrasion resistance is 0.04～0.09g/100r, burst size of methanal is 0.1～0.4mg/L.
5. the manufacture method of bamboo macrofiber composite material section bar according to claim 1 is characterized in that, as product color is not had specific (special) requirements and can save the A-3 step.
6. the manufacture method of bamboo macrofiber composite material section bar according to claim 1, it is characterized in that, as product color is required to be true qualities, hemicellulose and pectin content can be accounted for the pencil bamboo fibre of fabric integer 12% below and be placed in 1～2% hydrogen peroxide solution digestion 2～4 hours with alternative A-3 step.
7. the manufacture method of bamboo macrofiber composite material section bar according to claim 1, it is characterized in that, require to coffee-like as product colour, hemicellulose and pectin content can be accounted for the pencil bamboo fibre of fabric integer 12% below and be placed in the carbide furnace carbonization with alternative A-3 step.
8. the manufacture method of bamboo macrofiber composite material section bar according to claim 7, it is characterized in that, described carbonization, its technology is: hemicellulose and pectin content are accounted for the pencil bamboo fibre of fabric integer below 12% be placed in the carbide furnace, under 2～3 kilograms of pressure, the condition of 2～4 hours time bamboo fibre is carried out carbonization.
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|---|---|---|---|---|
| CN101774191B (en) * | 2010-03-09 | 2013-03-27 | 陈琳 | Bamboo fiber bundle plywood production technology |
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| CN104085023A (en) * | 2014-06-30 | 2014-10-08 | 贵州新锦竹木制品有限公司 | Mould-proof moth-proof process of bamboo chip |
| CN105328763A (en) * | 2015-10-21 | 2016-02-17 | 苏州东邦家具有限公司 | Preparation method for recombined bamboo wood for furniture manufacturing |
| CN107053415A (en) * | 2017-06-02 | 2017-08-18 | 黄山徽州竹艺轩雕刻有限公司 | The processing method of bamboo wood carbonization |
| CN107498652B (en) * | 2017-09-06 | 2020-10-23 | 南京林业大学 | High-strength bamboo fiber curtain-OSB container bottom plate and manufacturing method thereof |
| CN108202376A (en) * | 2018-01-03 | 2018-06-26 | 中山市大涌镇生产力促进中心 | A kind of lighting solid wood profile and its manufacturing method |
| CN108356939B (en) * | 2018-03-01 | 2021-05-14 | 安徽农业大学 | Preparation method of light bamboo wood |
| CN112356196A (en) * | 2020-10-30 | 2021-02-12 | 重庆大学 | Preparation method of high-performance bamboo steel composite material |
| CN113667432B (en) * | 2021-08-20 | 2022-06-28 | 广东省林业科学研究院 | Bamboo-based fiber composite material based on modified adhesive and novel assembly mode and preparation method and application thereof |
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| US5972467A (en) * | 1998-07-23 | 1999-10-26 | Washo; Kenji | Pressure forming process for pressure-formed bamboo products |
| CN101161432A (en) * | 2006-11-01 | 2008-04-16 | 胡波 | Color plant integrated material and its preparing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5972467A (en) * | 1998-07-23 | 1999-10-26 | Washo; Kenji | Pressure forming process for pressure-formed bamboo products |
| CN101161432A (en) * | 2006-11-01 | 2008-04-16 | 胡波 | Color plant integrated material and its preparing method |
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