CN100575022C - Bamboo matter medium density fibre board (MDF) - Google Patents

Abstract

The present invention is bamboo matter medium density fibre board (MDF) and preparation method thereof, solves existing bamboo fibre heating platen because the easy high temperature carbonization of the contained wax component of surperficial surf green forms black splotch, adhesive strength is low, thickness swelling rate is high, mildew resistance is poor, complicate fabrication process, contaminated environment, be not easy to the problem that secondary operations becomes to imitate solid-wood reinforced floor.It is to be made by the raw material of following weight portion: assorted bamboo fibre 100, urea-formaldehyde glue 8～15, mould inhibitor 0.5～5, curing agent 0.2～3, paraffin wax emulsions 1～3.Its preparation method will be for mixing bamboo after roller stone roller, comb scrape off except that part surface bamboo wax, cut into slices with disc slicer, put into temperature and be the aqueous solution that 80～130 ℃, NaOH account for bamboo chip weight 1～5%, pressurization 0.5MPa boiling bamboo chip 10～15min, after fibre, drying are separated in defibrator process again, the urea-formaldehyde glue that has added mould inhibitor, curing agent and paraffin wax emulsions is sprayed on hot pressing forms on the fiber.Its upper surface can preset the groove of V-type, circular arc type or other moulding, has expanded the raw material sources of medium density fibre board (MDF), has opened up the new way of the assorted bamboo of effective utilization.

Description

Bamboo matter medium density fibre board (MDF)

Technical field:

The present invention relates to medium density fibre board (MDF), relating in particular to assorted bamboo is the bamboo matter medium density fibre board (MDF) that raw material is made.

Technical background:

Fiberboard is that especially density is at 0.45～0.88g/cm to wood-fibred applying glue and the wooden boards goods made through hot pressing ³Between medium density fibre board (MDF) (MDF) with its cheap price and good performance and be widely used in the base material on furniture and floor.Along with development and national economy, stimulating that furniture and consolidated floor are manufacturing to go from strength to strength, also increasing to the demand of MDF.

Yet China is the country that the forest reserves lack relatively, and wood raw material is in short supply, and especially country implements wildwood protected project, carries out to prohibit comprehensively and cuts down.Therefore, many MDF manufacturing enterprise or be about to face because of there is lack of raw materials and cause half threat that stops production, stops production or change the line of production needs to seek alternative materials urgently.CN 1509854A discloses a kind of with caragana microphylla, salix monogolica, shrubs such as red building are the production method that primary raw material is made MDF, CN 1108903C discloses a kind of process of making MDF with cornstalk, CN 1535802A discloses the method for the waste and old production of paper products MDF of a kind of usefulness, CN 1149524A discloses a kind of eucalyptus medium density fibre board (MDF), CN 1235728C discloses a kind of MDF and method made from the ramulus mori fiber thereof, CN 1144153A discloses the technology that a kind of oil palm silk is produced MDF, CN 1004433B discloses a kind of cotton stalk MDF and production technology thereof, and CN 1073497C discloses a kind of straw straw MDF and manufacture method thereof.

China's bamboo resource is very abundant, has bamboo kind more than 40 to belong to kind more than 500, and wherein mao bamboon accounts for 60%, and other assorted bamboo (bamboo that grows thickly, scattered dwarf bamboo etc.) accounts for 40%, mainly is distributed in south 17 provinces (district), and bamboo grove area, accumulation and a year cutting capacity all occupy first place in the world.Bamboo grows in mountain region and hillside fields, soil is required low, drop into and maintenance cost few, plantation survival rate height, growth cycle is lacked, can grow into forest in 3～5 years to become a useful person, be the cellulosic material of fast growing.The wood-based plate that present China is raw material production with the bamboo wood is mainly bamboo plywood, bamboo mat plywood, bamboo wood laminate and bamboo crushed aggregates plate etc., wherein be to be raw material more than 90% with the mao bamboon, and the utilization rate of bamboo wood is low, and assorted in a large number bamboo is not utilized effectively so far as yet.

Bamboo fiber is cylindrical tube, and fibre length is only second to softwood and far above broadleaf, but its fibre diameter is little, and the draw ratio of fiber exceeds about one times than softwood, is higher than broadleaf far away; The hot strength of bamboo fiber is only a little bit poorer slightly than present widely used glass fibre, but its specific strength, specific modulus can be equal to glass.Therefore, bamboo fiber has better enhancing effect than lumber fibre.Content of cellulose and timber are similar in the chemical composition of bamboo wood; Pentose content is higher than softwood, and is close with broadleaf; Content of lignin is far above broadleaf, and is approaching with softwood.The chemical composition of bamboo wood is the raw material of a kind of good production MDF between pin, broadleaf generally.

The assorted bamboo resource in area, China Sichuan is very abundant, and area reaches 720,000 hectares, and especially a large amount of wild assorted bamboos as the firewood raw material, are formed the huge wasting of resources by local peasant household.The market price of at present assorted bamboo only is 1/4th of a mao bamboon, utilizes assorted bamboo to produce MDF and has tangible price advantage, can solve MDF raw materials for production problem in short supply to a great extent, and the agricultural industrialization is also had facilitation.

The outer surface surf green of bamboo contains one deck wax, in being hot pressed into the operation process of plate, this wax component not only can form black splotch on the fiberboard surface because of high temperature carbonization, influence the fiberboard presentation quality, and can influence adhesive bonding to bamboo fibre, reduce the internal bond strength of sheet material, this is that bamboo wood prepares one of technical barrier of medium density fibre board (MDF).

CN 1030524C discloses a kind of manufacturing process of dry production mao bamboon medium density fibre board (MDF), this technology does not only solve above-mentioned technical barrier, and because lignin, polysaccharide material and organic the extractives content are higher in the bamboo wood, bamboo fibre pliability by this technology preparation is relatively poor, cause into plate difficulty relatively, the MDF thickness swelling rate of production increases relatively.In addition, because the pH value of bamboo wood between 4.6～6.7, is to be fit to the required sour environment of fungus growth, make the bamboo wood medium density fibre board (MDF) that mildew phenomena take place under normal environment for use easily.CN 1076257C discloses a kind of production method of bamboo fiberboard, and the bamboo fibre with oven dry before gluing places the aqueous solution of agricultural chemicals to soak, to reach the effect of mildew and insect proof.This bamboo fibre through the agricultural chemicals aqueous solution soaking will cause energy waste and water environment pollution through could gluing after the drying once more.

One of main application of MDF is the base material as laminated flooring.A kind of imitative solid-wood reinforced timber floor has been subjected to liking of consumer on the market in recent years, it is characterized in that forming a chamfering at the edge of floor upper surface, thereby makes laminated flooring have the assembly unit effect of similar solid wooden floor board.CN 1484184A discloses a kind of laminated flooring (Fig. 1) with V-type groove structure, because having flooded the abrasion-proof paper and the facing paper of melamine formaldehyde resin and process precuring is fragility, according to its disclosed manufacture method, the steel plate that employing has a V-type convex tendon is directly suppressed abrasion-proof paper, facing paper, MDF and balance paper and is caused abrasion-proof paper or facing paper embrittlement easily, and the yield rate of product is low.Though with steel plate the MDF base material is carried out hot pressing earlier in the actual production with V-type convex tendon, and then abrasion-proof paper, facing paper, MDF and balance paper carried out the secondary hot pressing composite molding, can improve yield rate, but not only increased production cost, reduce production efficiency, and can cause its mechanical properties decrease because the MDF base material is carried out heating for multiple times.

Summary of the invention:

The purpose of this invention is to provide a kind of is the with low cost of raw material with assorted bamboo, and presentation quality is good, internal bond strength is high, the mildew-resistant water resistance is good, and manufacture process is free from environmental pollution, is convenient to the bamboo matter medium density fibre board (MDF) that secondary operations becomes Wood-emulating floor.

The present invention is achieved in that

The present invention is to assorted bamboo fibre applying glue of removing the bamboo wax and the bamboo lumber goods of making through hot pressing.

The present invention's bamboo medium density fibre board (MDF) of mixing is to be made by the raw material of following weight portion:

Remove the assorted bamboo fibre of bamboo wax: 100

Urea-formaldehyde glue: 8～15

Mould inhibitor: 0.5～5

Curing agent: 0.2～3

Paraffin wax emulsions: 1～3

Its preparation method will be for mixing bamboo after roller stone roller, comb scrape off except that part surface bamboo wax, cut into slices with disc slicer, put into temperature and be the aqueous solution that 80～130 ℃, NaOH account for bamboo chip weight 1～5%, pressurization 0.5MPa boiling bamboo chip 10～15min, fibre is separated in defibrator process again, dry back obtains required bamboo fibre; The urea-formaldehyde glue that has added mould inhibitor, curing agent and paraffin wax emulsions is sprayed on that hot pressing forms on the fiber, hot pressing process uses the cope match-plate pattern with parallel convex tendon, and is fluted at the fiberboard upper surface of making again.

The cross section of the assorted bamboo medium density fibre board (MDF) upper surface groove of the present invention is V-type or circular arc type or ladder type or square type (Fig. 2, Fig. 3).

Curing agent of the present invention is one or more mixtures in ammonium chloride, ammonium sulfate, urea, ammoniacal liquor, hexamethylenetetramine, tartaric acid, oxalic acid, citric acid, acylate etc. and the microcapsules curing agent.

Mould inhibitor of the present invention is one or more mixtures in organic mould inhibitors such as quaternary ammonium salts, biguanides, alcohols, phenols, organic metal class, pyridines, imidazoles, thiophene-based.Its mechanism of action mainly is to combine with the surface of cell membrane anion of bacterium and mould, or reacts with sulfenyl, destroys the synthesis system of albuminous cell film, suppresses the breeding of bacterium and mould.

The present invention has following advantage:

1) improves utilization rate of bamboo, reduce cost of material; 2) adopt advanced production technology, improve presentation quality, mechanical property, fungicidal properties and the water resistance of assorted bamboo medium density fibre board (MDF); 3) in assorted bamboo MDF forming process, surperficial thereon synchronously pre-stamped V-type, circular arc type or other moulding groove are to reduce the follow-up cost that is used to produce imitative solid-wood reinforced timber floor.

In order to overcome the deficiency of technology before, the present invention at first will mix bamboo after roller stone roller, comb scrape off except that part surface bamboo wax, before assorted bamboo chip defibrator process, adopt the alkaline boiling of pressurization of heating again, both can further remove the wax on clean surf green surface, the acidity of assorted bamboo can neutralize again, the organic substance of starch, fat, protein and polysaccharide that stripping is a large amount of and a spot of lignin destroy the acidity and the nutrient environment that are fit to fungus growth, improve the fungicidal properties of assorted bamboo MDF; Can reduce the softening temperature of lignin again, thereby softening assorted bamboo promotes fiber separation, protection fibre morphology and performance, the wearing and tearing and the energy consumption of minimizing subsequent thermal grinder ordered pair fiber.In addition, remain with an amount of lignin in the assorted bamboo fibre, in being hot pressed into the plate process,, can make assorted bamboo fibre become plate rapidly and can not cause excessive degradation owing to the thermoplasticity effect of lignin, the internal stress of institute's panel also obviously reduces, thereby helps improving bonding strength and dimensional stability.Add the mould inhibitor of high effect nontoxic or low toxicity in urea-formaldehyde glue and paraffin wax emulsions waterproofing agent mixing use, can significantly improve the fungicidal properties of assorted bamboo MDF easily, widen its scope of application.The convex tendon that adopts cope match-plate pattern to have V-type, circular arc type or other moulding is hot pressed into plate, can be synchronously preset V-type, circular arc type or other moulding groove at the upper surface of the assorted bamboo MDF of institute's moulding, reduce the follow-up secondary hot pressing process of the process of imitative solid-wood reinforced floor to assorted bamboo MDF that be used for producing, reduction technology cost also improves the quality of products.

Assorted bamboo medium density fibre board (MDF) of the present invention; the raw material sources of medium density fibre board (MDF) have not only been expanded; alleviated the contradiction of raw material supply anxiety; and the effect of having played saving timber, having protected forest resources; opened up a new way for effective utilization of assorted bamboo simultaneously; and can increase bamboo farming income, have ecology and social benefit preferably.

Description of drawings:

The imitative solid-wood reinforced timber floor assembly unit effect schematic diagram that Fig. 1 makes for the present invention

Fig. 2 surface has the profile of the bamboo matter medium density fibre board (MDF) of V-type groove

Fig. 3 surface has the profile of the bamboo matter medium density fibre board (MDF) of circular groove

The preparation technology figure of Fig. 4 bamboo matter medium density fibre board (MDF)

The heat pressing process figure of Fig. 5 bamboo matter medium density fibre board (MDF) making sheet

The specific embodiment:

The invention will be further described below by embodiment and accompanying drawing.Need to prove that these embodiment are used to limit protection scope of the present invention, protection scope of the present invention is as the criterion with appending claims.

To mix bamboo after roller stone roller, comb scrape off except that part surface bamboo wax, adopt disc type bamboo timber slicer that assorted bamboo is chipped, put into temperature and be the aqueous solution pressurization 0.5MPa boiling 15min that 120 ℃ NaOH accounts for bamboo chip weight 5%, the bamboo chip of boiling is dropped into the QM6 defibrator carry out defibrator process and separate fibre, obtain bamboo fibre and carry out drying; The bamboo fibre of 100 weight portions is sprayed the mixed glue solution of being formed by 5 weight portion mould inhibitors, 1.5 weight portion curing agent, 3 weight portion paraffin wax emulsions waterproofing agents and 12 weight portion urea-formaldehyde glues of 21.5 weight portions; The moulding of mating formation then, precompressed, the steel form that uses cope match-plate pattern to have the V-type convex tendon carries out hot pressing, control thickness 8mm ± about 0.20, hot pressing temperature 160-165 ℃, pressing cycle 270s (Fig. 4, Fig. 5); After passing through health, sanding again, make the assorted bamboo medium density fibre board (MDF) of finished product.Through quality inspection, all meet the requirement of high-class product among standard GB/T 11718-1999 " medium density fibre board (MDF) ", testing result is as follows:

Project Unit Index request Embodiment Density ??Kg/m ³ ??450～880 ??0.85 Internal bond strength ??MPa ??≥0.65 ??1.17 MOR ??MPa ??≥23 ??28 Thickness swelling rate ??％ ??≤15 ??11 Moisture content ??％ ??4～13 ??10 Burst size of methanal ??mg/100g ??≤9.0 ??8.2 Fungicidal properties * Grade ??- ??1

* pressing ASTM G21-96 method detects.

Claims (2)

1, a kind of bamboo matter medium density fibre board (MDF) is characterized in that it is to be made by the raw material of following weight portion:

Remove the assorted bamboo fibre of bamboo wax: 100

Urea-formaldehyde glue: 8～15

Mould inhibitor: 0.5～5

Curing agent: 0.2～3

Paraffin wax emulsions: 1～3,

To mix bamboo after roller stone roller, comb scrape off except that part surface bamboo wax, cut into slices with disc slicer, put into temperature and be the aqueous solution that 80～130 ℃, NaOH account for bamboo chip weight 1～5%, pressurization 0.5MPa boiling bamboo chip 10～15min, fibre is separated in defibrator process again, dry back obtains required bamboo fibre; The urea-formaldehyde glue that has added mould inhibitor, curing agent and paraffin wax emulsions is sprayed on that hot pressing forms on the fiber, hot pressing process uses the cope match-plate pattern with parallel convex tendon, and is fluted at the fiberboard upper surface of making again.

2, the manufacture method of bamboo matter medium density fibre board (MDF) according to claim 1, the cross section that it is characterized in that groove are V-type or circular arc type or ladder type or square type.