CN101638874B - Method for preparing fiber wallboard through wet process - Google Patents
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Abstract
The invention discloses a method for preparing a fiber wallboard through a wet process. The method comprises the following steps: 1) pulping: mixing non-wood type natural plant fiber pulp with gramineous plant pulp according to a dry weight ratio of 1:0-1.5 and adding water into the raw materials to dilute the pulp; 2) storing the pulp: placing the obtained mixture pulp into a pulp storage pond and adding water for dilution; 3) carrying out suction filter and formation: inputting the pulp obtained from the previous step into a die cavity for cold-pressing, dehydration and formation so as to obtain a wet blank; and 4) carrying out hot-pressing formation and drying; transferring the wet blank into a hot-pressing mould for hot pressing, removing water generated during the hot pressing, and obtaining the fiber wallboard. The fiber wallboard obtained by using the method has the characteristics of environment-friendliness and high strength.
Description
Technical field
The invention belongs to Material Field, relate to a kind of preparation method who decorates with fiber wallboard, particularly a kind of method for preparing indoor decoration flame retardant type fiber wallboard with the wet method molding process planning.
Background technology
Wall decorative material is indispensable important component part in building construction, is also the important development field in present building material.Building is mainstay of the national economy industry, is also the foundation engineering of modernization construction.At present, the annual city completion area of dwelling structure of China is about 3.35 hundred million m
2, the annual completion area of dwelling structure in villages and small towns is 500,000,000 m approximately
2, approximately 600,000,000 m are built with public building, the productivity of building in city and villages and small towns
2The required wall decorative material of these architectural engineerings approximately needs 4,000,000,000 m with 2.5 times of calculating of construction area
2The huge market demand is for the market prospects of novel wall ornament materials have been established good development foundation.
At present the kind of conventional chamber inner wall ornament materials is a lot, mainly contains on building and ornament materials market at home and abroad: plasterboard, aluminium-plastic panel, polyester fiber board, mineral wool board, tencel cement Side fascia, environmental protection woodwork plate, glued board etc.But it is few that the product on market meets the standard of green building material fully, there is no that the use recyclable materials is made and the decorated articles of complete environmental protection.The easy hardening embrittlement of plastic products, the time is for a long time also easy to change, and discarded being difficult to later on degraded, and causes great environmental pollution.Although plastering is cheap, the outward appearance nature, but serious not, tide is afraid of in moisture absorption, the jaundice variable color easily comes off.Wood chip products is used for the decorative panel liner of furniture mostly, and the decorative pattern veneer is used in the outside, has the problems such as fastness is not high, adhesive contamination.Medium density fibre board (MDF) commonly used, although outward appearance and inherent quality are all relatively good, exist adhesive contamination indoor environment and materials more, expensive in the market, still is subject to certain restrictions on being widely used, and mainly is suitable as high-grade ornament materials.
The materials such as decoration at present, clamping plate that compartment uses, log are essentially combustibles, although also have on the market nonflammable material, but existing, general nonflammable material makes the shortcoming that is difficult for reaching Heavy Weight, the plasterboard of for example making with high burning-point characteristic, in the situation that after burning or weather xeothermic, the easy embrittlement of this gypsum, even cause bending, peel off and the problem such as be full of cracks, especially strengthen with respect to present Global Greenhouse Effect, temperature rises year by year, therefore with gypsum as nonflammable material, do not met the requirement of modern interior decoration, the utmost point need improve.
Dalle in the market adopts the dry process preparation mostly, as plasterboard, artificial decorative board, polyester fiber board, mineral wool board, glued board etc.The string wallboard adopts dry process for forming production mostly, namely be equipped with at normal temperatures the auxiliary agent dry mixed such as amylan or thermoplastic polymer, coupling agent, blowing agent, lubricant mixes thoroughly with the raw material (maize straw, straw, wheat straw, cavings, sawdust etc.) of pulverizing, enter mould with artificial (or machinery) material loading, extrusion modling forms.The step of dry process: raw material pulverizes, reinforcedly mix, mat formation, hot-forming, the demoulding, finished product.The shortcoming that these steps cause is as follows: 1, can not make real degradable green product.To add some photodissociation materials or a small amount of starch makes it be decomposed into little powder in nondegradable material mostly with the product of this explained hereafter on the market, not truly degraded, so its pollution and harm to environment still exists.2, the part product that is added with starch easily goes mouldy under wet environment, unsuitable long preservation; 3, weight lays particular stress on, and cost of transportation is higher, also can increase the weight of offal treatment simultaneously.
In present published technology, patent documentation CN1108988A discloses " production method of the glue-free hardboard of a kind of dry method ", the method through fiber separation, drying, gets a kind of wood-based plate in the condition compacted under, the hot pressing that do not apply synthetic resin with plant material.The product strength of the method gained is lower.
Patent documentation CN1654180 discloses " a kind of method of manufacturing glue-less fiber board by leak-free type hot pressing technology ", and it provides, and a kind of hot pressing pressure is low, the manufacture method of the thickness of product and the larger non-glue fibre board of density range.Due to its raw material that uses with and special process, cause this kind non-glue fibre board insufficient strength when thickness is low.
Disclose in patent documentation CN1184161C " environment protection type flame-retarding decorative plate and preparation method thereof ", the method provide a kind of formaldehydeless, have fire retardation, make simple, that cost is low environment friendly decoration board and preparation method thereof, but the method is to add conventional flame retardants in dry process, then add glutinous paste and do the adhesive extrusion forming, technique relative complex and not being applied on wet processing.
The fiber board products that existing wet therapy forming process is produced, mainly that the tableware equal thickness is less than the goods of 5mm, its production technology adopts Steam Pressure transmission and pressurization basically, moulding pressure is less, thereby be difficult to form certain thickness goods, and can not form the surface and have the degree of precision goods, more not relate to the formation of convex-concave degree.Goods and the relevant report of the three-dimensional paper technology production of paper mould wet method flame retardant type fiber wallboard also appear using up to now.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of with low cost, manufacture craft and simply utilizes wet processing to prepare the method for fiber wallboard, adopt the method preparation and fiber wallboard have environmental protection and high-intensity characteristics.
In order to solve the problems of the technologies described above, the invention provides a kind of method of utilizing wet processing to prepare fiber wallboard, comprise the following steps successively:
1), slurrying:
Non-wood type natural plant fibre slurry and grass slurry are mixed according to 1: 0～1.5 dry weight weight ratio; Become raw material; Thin up is dredged slurry in above-mentioned raw materials, must mix slurry after uniform stirring; The raw material dry weight accounts for 3.0～5.0% of mixed slurry weight amount;
2), storage slurry:
Above-mentioned mixing slurry is put into pulp storage tank, be watered dilution, after uniform stirring, get slurries; Described raw material dry weight accounts for 0.3～0.6% of slurry weight; Preferred 0.4%;
3), filtering molding:
Above-mentioned slurries are input to carry out the Squeeze dewatering moulding in die cavity, get wet base; The wet base of gained be in die cavity slurry weight 1.0～10.0%; Preferred 8.0%;
4), thermocompression forming and drying
Above-mentioned wet base is transferred in hot-die, at 0.5～5.0kg/cm
3Pressure and the temperature of 98～280 ℃ under hot pressing 18～60s, and remove the moisture that produces in hot pressing; Get fiber wallboard.
As the improvement that utilizes wet processing to prepare the method for fiber wallboard of the present invention: be step 1): add waterproofing agent and/or fire retardant and water to dredge slurry in raw material, uniform stirring must mix slurry; Waterproofing agent is 2.0%～15.0% of raw material dry weight, preferred 2.5%～9.0%; Fire retardant is 1.0%～45.0% of raw material dry weight, preferred 18.0%～28.0%.
Improve as the another kind of the method that wet processing prepares fiber wallboard that utilizes of the present invention: waterproofing agent and/or fire retardant are added water dilute, fully after dissolving spray coating liquor; With step 3) the wet base of gained sprays first with above-mentioned spray coating liquor; And then carry out step 4) thermocompression forming with dry, and in step 4) in carry out simultaneously the spray again of spray coating liquor; Twice spray waterproofing agent total amount used is 2.0%～15.0%, preferred 2.5%～9.0% of die cavity Raw dry weight; Twice spray fire retardant total amount used is 1.0%～45.0%, preferred 18.0%～28.0% of die cavity Raw dry weight.
As the further improvements in methods of utilizing wet processing to prepare fiber wallboard of the present invention: non-wood type natural plant fibre slurry is bamboo pulp, cane syrup, straw pulp, reed pulp or secondary stock; The grass slurry adopts grass stalk or gramineous lawn to make.The manufacture craft of grass slurry is as follows: the grass stalk after first drying or gramineous lawn removal of impurities, then be ground into the length of 1～5cm, then the 60～72h that is soaked in water, utilize kneading or grinding leaser to make the grass slurry.The grass stalk is rice straw, maize straw, wheat stalk, corncob, broomcorn straw or Barley straw, and gramineous lawn is Festuca Arundinacea, rye grass or annual bluegrass.
As the further improvements in methods of utilizing wet processing to prepare fiber wallboard of the present invention: fire retardant is organic silicon fibre retardant (particularly water-soluble organic silicon fire retardant), phosphorus-nitrogen containing flame retardant or inorganic combustion inhibitor; Waterproofing agent is organosilicon series waterproofing agent or environment-friendly type waterproofing agent;
Organic silicon fibre retardant such as the SFR10 that can select GE company, polysiloxanes fire retardant etc.;
Phosphorus-nitrogen containing flame retardant for example can be selected the rich FR2003 of chemical company that seizes, the water-soluble flame retardant FR-PN of the large chemical company in sea, Qingdao City etc.;
Inorganic combustion inhibitor such as the ZR-BB02 that can select aluminium hydroxide, magnesium hydroxide, Firebrake ZB, borax, Hangzhou long-range chemical assistant factory etc.;
Organosilicon series waterproofing agent for example can be selected dodecyltrimethoxysilane (DTS), Methyl Hydrogen Polysiloxane Fluid, hydroxy silicon oil;
The environment-friendly type waterproofing agent is made the LZ19-06 class Cypres that glues factory, the cationic neutral sizing agent of HA-321 of Tianjin Synthetic Material Industry Research Institute development etc. such as the waterproofing agent FT-310A that can select Hangzhou long-range chemical assistant factory and waterproofing agent T-556, the waterproofing agent CH-2 of HangZhou HangHua BoMo paper Chemicals products Co., Ltd, good the doing in the full pool, Pinghu.
As the further improvements in methods of utilizing wet processing to prepare fiber wallboard of the present invention: step 4) be hot pressing 18～60s at the temperature of the pressure of 1.5～2.5kg/cm3 and 170～265 ℃.
As the further improvements in methods of utilizing wet processing to prepare fiber wallboard of the present invention: step 3) cold pressing at the pressure of 0.5～2.0Kg/cm3.
Adopt the preparation method of fiber wallboard of the present invention, have following advantage:
1, owing to utilizing the non-wood type natural plant fibre slurry such as cane syrup, reed pulp, bamboo pulp, straw pulp to be main raw material, utilized the grass that grass stalk or gramineous lawn are made to starch as auxiliary material; These raw material sources are extensive, storage greatly, all belongs to renewable resource, and for example, Chinese annual agricultural crop straw output reaches 6.2 hundred million tons more than, approximately 4,000 ten thousand tons of bagasse annual productions; Therefore method of the present invention has that raw material is easy to get, characteristics with low cost.The present invention avoids having used wood pulp as raw material, contributes to preserving the ecological environment.Fiber wallboard of the present invention reaches the requirement of the indoor decoration plate in medium-density plate GB GB11718 of the same type, and wherein content of formaldehyde is zero, is a kind of novel environmental protection goods, is particularly suitable for interior decoration.
2, owing to having added suitable fire retardant and waterproofing agent in raw material, and adopt special process of the present invention, guaranteed the abundant absorption of waterproofing agent and fire retardant, simple to operate, can effectively control the use amount of waterproofing agent and fire retardant, workable; The fiber wallboard that has not only guaranteed gained has good water proof fire retardant function, can also effectively avoid the production process pollution on the environment, has also reduced production cost simultaneously.The selection of fire retardant and waterproofing agent is the principle of mutually not repelling according to water-soluble feature and both.
3, take full advantage of the good advantage of grass starch deflection that non-wood type natural plant fibre slurry adhesion is strong and utilize kneading or grinding leaser to make, improve the intensity of goods when reducing costs, thereby guaranteed to produce the fiber wallboard of certain thickness and intensity.
4, owing to having adopted special process of the present invention, therefore can overcome the defective that dry process need add adhesive, also can overcome conventional wet technique and can not produce the defective with certain thickness stereo product.
5, utilize particular surface on hot pressing die, can make the front of fiber wallboard form the exquisite pattern with three-dimensional convex-concave sense, not only can play the effect in the border of beautifying ring, can also reach the effect of sound-absorption and heat-insulation.
Adopt special process of the present invention, the thickness that can make the fiber wallboard of gained is 1.2～10mm, and the stereo concave-convex pattern height in fiber wallboard front reaches 5～100mm, and the convex-concave degree of common wallpaper is below 0.5mm.
The fiber wallboard main performance index that adopts the inventive method to produce is as follows: content of formaldehyde is almost nil, reaches the E0 level, (and these pathogenic carcinogens of radon, benzene, ammonia and trichloro-ethylene not detected), compression strength 〉=200Mpa; Heat transfer coefficient≤0.020W/m
2K; High temperature dimensional stability≤0.2%.The final detection data of following embodiment all meet above-mentioned performance indications.Include the fiber wallboard of waterproofing agent and fire retardant, water proofing property meets the examination criteria of GB13341-2003 and GB/T1540-2002, and flame retardant effect meets the national examination criteria of GB/T 5464-1999 and GB/T 8627-1999.
In sum, the fiber wallboard that adopts the inventive method to produce has the specific of lightweight, sound-absorbing and effect of heat insulation, is a kind of real Green Product.Simultaneously, such wallboard has unique convex-concave design, forms pattern elegant in appearance, has good artistic effect, thereby, can meet modern life demand.
The specific embodiment
Below in conjunction with embodiments of the invention, invention is further elaborated, but does not limit the present invention.
Embodiment 1, a kind of method of utilizing wet processing to prepare fiber wallboard, carry out successively following steps:
1, slurrying:
The primary colors bamboo pulp of the dry weight 90% by commercial acquisition is added beater, add water and dredge slurry 20min, beating degree is 14～15SR (beating degree); Then change in the pond of filling a prescription and stir 5min, must mix slurry; The dry weight of primary colors bamboo pulp accounts for 3% of mixed slurry weight amount.
2, storage slurry:
Above-mentioned mixing slurry is put into pulp storage tank, be watered dilution, and after the agitator uniform stirring with 10～12r/min, get slurries; The dry weight of described primary colors bamboo pulp accounts for 0.3% of slurry weight.
3, filtering molding:
Homogenate after making is transported in the die cavity of the automatic paper pulp moulding apparatus that Hangzhou Eurasian equipment Co., Ltd produces by pipeline, with vacuum filtration method suction strainer, uses 1.0Kg/cm
3Pressure, elder generation's press filtration in die cavity falls to account for the moisture of slurry weight 90%, gets wet base; Weight that namely should wet base be in die cavity slurry weight 10%.
4, thermocompression forming and drying
Above-mentioned wet base is transferred to shaping and drying in the hot-die of this forming machine, the upper and lower mould of hot pressing is at 1.5Kg/cm
3The effect of hot pressing mold clamping force under fit tightly, the moisture content in wet base is siphoned away by hot pressing counterdie vacuum after vaporization; Hot pressing patrix temperature is controlled at 180 ℃ ± 2 ℃, and hot pressing counterdie temperature is controlled at 200 ℃, and total hot pressing time is 30s; Get goods (being fiber wallboard).
5, trimming and check finished product
After thermocompression forming was completed, compressed air blew to goods on conveyer belt, then delivered to the side cutter cuts burr, last quality inspection, packing warehouse-in.This embodiment mould therefor size is 46 * 46cm, and the plate body thickness of fiber wallboard is 9mm; Height of concave convex is 5mm.The stereo concave-convex pattern can change according to mould, and the present embodiment is designed to the China knot pattern, but is not limited to this pattern.
The compression strength of this fiber wallboard is 〉=200N that its plane tensile strength is 0.78Mpa; Plate body density is 0.68g/cm
3
Embodiment 2, a kind of method of utilizing wet processing to prepare fiber wallboard are adjusted into following content with the slurrying of step 1:
1, slurrying:
The primary colors bamboo pulp of the dry weight 90% by commercial acquisition is added beater, add water and dredge slurry 20min, beating degree is 14～15SR (beating degree); Then change in the pond of filling a prescription and stir 5min, then add the waterproofing agent of primary colors bamboo pulp dry weight 5% and the fire retardant of raw material dry weight 20%, after stirring 6min with per minute 10 agitators that turn, must mix slurry; The dry weight of primary colors bamboo pulp accounts for 3% of mixed slurry weight amount.
The ZR-BB01 fire retardant that the FT-556 waterproofing agent that waterproofing agent for example can select Hangzhou long-range chemical assistant factory to produce, fire retardant for example can select Hangzhou long-range chemical assistant factory to produce.
Select different upper/lower dies, all the other contents are with embodiment 1.
The thickness of gained fiber wallboard is 2.5mm; Height of concave convex is 5mm.
This fiber wallboard compression strength is 〉=200N, and its plane tensile strength is 0.71Mpa, and plate body density is 0.69g/cm
3
Water proofing property meets the examination criteria of GB13341-2003 and GB/T1540-2002, and flame retardant effect meets the national examination criteria of GB/T 5464-1999 and GB/T 8627-1999.
Embodiment 3, a kind of method of utilizing wet processing to prepare fiber wallboard, make the slurrying of step 1 into following content:
1, slurrying:
Waterproofing agent and fire retardant are joined in Object storing drum in proportion, add the water stirring and make its dissolving, after stirring 6min with agitator, add the primary colors bamboo pulp of dry weight 90%, thin up is dredged slurry, fully stirs in holding stock tank, after 20min, must mix slurry; Waterproofing agent is 2.5% of primary colors bamboo pulp dry weight, and fire retardant is 18% of primary colors bamboo pulp dry weight; The dry weight of primary colors bamboo pulp accounts for 3% of mixed slurry weight amount.
Select the upper/lower die with relief pattern, all the other contents are all with embodiment 2.
The thickness of fiber wallboard is 2.5mm; Height of concave convex is 5mm.
The fiber wallboard compression strength that forms be 〉=200N, its plane tensile strength is 0.73Mpa, plate body density is 0.70g/cm
3
Its water proofing property and flame retardant effect all meet national examination criteria.
Embodiment 4, a kind of method of utilizing wet processing to prepare fiber wallboard, carry out successively following steps:
1, preliminary treatment:
After being dried removal of impurities, broomcorn straw is ground into the length of 1～5cm, then the 60～72h that is soaked in water, put into kneading or grinding leaser, high dense mill is rubbed the mill sub-wire with the hands and is become certain density mechanical pulp (being the broomcorn straw mechanical pulp);
In this broomcorn straw mechanical pulp, the dry weight of broomcorn straw is 10%.
2, slurrying:
The broomcorn straw mechanical pulp (as the grass slurry) of primary colors bamboo pulp and the dry weight 10% of dry weight 60% is mixed according to the dry weight weight ratio of 1: 1, become raw material; Be put in beater, add water and dredge slurry 25min, beating degree is 14～15SR (beating degree); Then change in the pond of filling a prescription, add the waterproofing agent of raw material dry weight 9% and the fire retardant of raw material dry weight gross weight 25%, after stirring 7min with per minute 10 agitators that turn, must mix slurry; The dry weight of the dry weight of primary colors bamboo pulp+broomcorn straw mechanical pulp=raw material dry weight, the raw material dry weight accounts for 5% of mixed slurry weight amount.
3, storage slurry:
Above-mentioned mixing slurry is put into pulp storage tank, be watered dilution, and after the agitator uniform stirring with 10～12r/min, get slurries; The dry weight of described raw material accounts for 0.4% of slurry weight;
4, filtering molding:
Slurries after making are transported in the die cavity of the automatic paper pulp moulding apparatus that Hangzhou Eurasian equipment Co., Ltd produces by pipeline, with vacuum filtration method suction strainer, use 1.0Kg/cm
3Pressure, elder generation's press filtration in die cavity falls to account for the moisture of slurry weight 99%, gets wet base; Weight that namely should wet base be in die cavity slurry weight 1%.
5, thermocompression forming and drying
Above-mentioned wet base is transferred to shaping and drying in the hot-die of this forming machine, the upper and lower mould of hot pressing is at 1.5Kg/cm
3The effect of hot pressing mold clamping force under fit tightly, the moisture content in wet base is siphoned away by hot pressing counterdie vacuum after vaporization; Hot pressing patrix temperature is controlled at 180 ℃ ± 2 ℃, and hot pressing counterdie temperature is controlled at 200 ℃, and total hot pressing time is 18s; Get goods.
6, trimming and check finished product
After thermocompression forming was completed, compressed air blew to goods on conveyer belt, delivered to the side cutter cuts burr, last quality inspection, packing warehouse-in.
The thickness of fiber wallboard is 2.5mm; Height of concave convex is 5mm.
This fiber wallboard compression strength is 〉=200N, and its plane tensile strength is 0.67Mpa, and plate body density is 0.64g/cm
3
Water proofing property and flame retardant effect all meet national examination criteria.
Embodiment 5, a kind of method of utilizing wet processing to prepare fiber wallboard, carry out successively following steps:
1, preliminary treatment:
Be equal to embodiment 4.In this broomcorn straw mechanical pulp, the dry weight of broomcorn straw is 40%.
2, slurrying:
The primary colors bamboo pulp of dry weight 60% and the broomcorn straw mechanical pulp of dry weight 40% are mixed according to the dry weight weight ratio of 3: 2, become raw material, be put in beater, add water and dredge slurry 25min, beating degree is 14～15SR (beating degree); Then change in the pond of filling a prescription, add the waterproofing agent of raw material dry weight 8%, after stirring 5min with per minute 10 agitators that turn, must mix slurry; The dry weight of the dry weight of primary colors bamboo pulp+broomcorn straw mechanical pulp=raw material dry weight, the raw material dry weight accounts for 5% of mixed slurry weight amount.
3, storage slurry:
Above-mentioned mixing slurry is put into pulp storage tank, be watered dilution, and after the agitator uniform stirring with 10～12r/min, get slurries; Described raw material dry weight accounts for 0.3% of slurry weight;
4, filtering molding:
Slurries after making are transported in the die cavity of the automatic paper pulp moulding apparatus that Hangzhou Eurasian equipment Co., Ltd produces by pipeline, with vacuum filtration method suction strainer, use 1.5Kg/cm
3Pressure, elder generation's press filtration in die cavity falls to account for the moisture of slurry weight 95%, gets wet base; Weight that namely should wet base be in die cavity slurry weight 5%.
5, thermocompression forming and drying
Above-mentioned wet base is transferred to shaping and drying in the hot-die of this forming machine, the upper and lower mould of hot pressing is at 1.5Kg/cm
3The effect of hot pressing mold clamping force under fit tightly, the moisture content in wet base is siphoned away by the vacuum of hot pressing counterdie after vaporization; Hot pressing patrix temperature is controlled at 180 ℃ ± 2 ℃, and hot pressing counterdie temperature is controlled at 200 ℃, and total hot pressing time is 20s; Get goods.
6, trimming and check finished product
After thermocompression forming was completed, compressed air blew to goods on conveyer belt, delivered to the side cutter cuts burr, last quality inspection, packing warehouse-in.
The thickness of fiber wallboard is 2.5mm; Height of concave convex is 5mm.
This fiber wallboard compression strength is 〉=200N, and its plane tensile strength is 0.69Mpa, and plate body density is 0.65g/cm
3
Water proofing property meets national examination criteria.
Embodiment 6, a kind of method of utilizing wet processing to prepare fiber wallboard, carry out successively following steps:
1, preliminary treatment:
After being dried removal of impurities, wheat stalk is ground into the length of 1～5cm, then the 60h that is soaked in water, put into kneading or grinding leaser, high dense mill is rubbed the mill sub-wire with the hands and is become certain density mechanical pulp (being the wheat stalk mechanical pulp).
In this wheat stalk mechanical pulp, the dry weight of wheat stalk is 40%.
2, slurrying:
The wheat stalk mechanical pulp (as the grass slurry) of bamboo pulp and the dry weight 40% of dry weight 60% is mixed according to the dry weight weight ratio of 1: 1.5, become raw material, be put in beater, add water and dredge slurry 30min, beating degree is 14～15SR (beating degree); Then change in the pond of filling a prescription, after stirring 7min with per minute 10 agitators that turn, must mix slurry; The raw material dry weight accounts for 4% of mixed slurry weight amount.
The dry weight of the dry weight of bamboo pulp+wheat stalk mechanical pulp=raw material dry weight.
3, storage slurry:
Above-mentioned mixing slurry is put into pulp storage tank, be watered dilution, and after the agitator uniform stirring with 10～12r/min, get slurries; Described raw material dry weight accounts for 0.5% of slurry weight;
4, filtering molding:
Slurries after making are transported in the die cavity of the automatic paper pulp moulding apparatus that Hangzhou Eurasian equipment Co., Ltd produces by pipeline, with vacuum filtration method suction strainer, use 1.0Kg/cm
3Pressure, elder generation's press filtration in die cavity falls to account for the moisture of slurry weight 99%, gets wet base.
5, make spray coating liquor:
The waterproofing agent of raw material dry weight gross weight 5% and the fire retardant of raw material dry weight gross weight 18% fully are dissolved in the water, and for example can control the mass concentration of waterproofing agent in spray coating liquor is 10%.
6, spray first:
Half of above-mentioned spray coating liquor is sprayed on all wet bases equably, i.e. spray coating liquor=above-mentioned steps 5 used on each wet base) quantity of the wet base of spray coating liquor ÷ 2 ÷ of gained.
7, thermocompression forming and drying
Wet base after above-mentioned spray is first transferred to shaping and drying in the hot-die of this forming machine, and the upper and lower mould of hot pressing is at 1.5Kg/cm
3The effect of hot pressing mold clamping force under fit tightly, in the time of hot pressing, the wet base in hot-die is sprayed again, second half of above-mentioned spray coating liquor is sprayed on all wet bases equably; Moisture content in wet base is siphoned away by hot pressing counterdie vacuum after vaporization; Hot pressing patrix temperature is controlled at 180 ℃ ± 2 ℃, and hot pressing counterdie temperature is controlled at 200 ℃, and total hot pressing time is 25s; Get goods.
8, trimming and check finished product
After thermocompression forming was completed, compressed air blew to goods on conveyer belt, delivered to the side cutter cuts burr, last quality inspection, packing warehouse-in.
The thickness of fiber wallboard is 2.5mm; Height of concave convex is 5mm.
This fiber wallboard compression strength is 〉=200N, and its plane tensile strength is 0.63Mpa, and plate body density is 0.62g/cm
3
Water proofing property and flame retardant effect all meet national examination criteria.
Embodiment 7, a kind of method of utilizing wet processing to prepare fiber wallboard
The rice straw mechanical pulp of handling well that the conversion dry weight is respectively 70% primary colors cane syrup and 30% mixes according to the dry weight weight ratio of 2: 1, becomes raw material; The dry weight of the dry weight of primary colors cane syrup+rice straw mechanical pulp=raw material dry weight; Raw material is put in and adds the thin slurry of water 30min in beater, then the slurries after above-mentioned discongesting are changed in the pond of filling a prescription, then after adding waterproofing agent and fire retardant to stir 10min, waterproofing agent is 9% of raw material dry weight, and fire retardant is 25% of raw material dry weight, must mix slurry; To mix slurry and put into pulp storage tank, thin up accounts for 0.35% of mixed slurry weight amount to the raw material dry weight.Hot pressing patrix temperature is controlled at 240 ℃, and the counterdie temperature is controlled at 260 ℃, and hot pressing time is 20s.All the other all are equal to embodiment 4.
The thickness of fiber wallboard is 2.5mm; Height of concave convex is 5mm.
This fiber wallboard compression strength is 〉=200N, and its plane tensile strength is 0.66Mpa, and plate body density is 0.61g/cm
3
Water proofing property and flame retardant effect all meet national examination criteria.
Embodiment 8, a kind of method of utilizing wet processing to prepare fiber wallboard,
Changing the dry weight 60% primary colors bamboo pulp in embodiment 4 into dry weight is 77% white cane syrup, changes the broomcorn straw mechanical pulp of dry weight 10% into dry weight 23% wheat stalk mechanical pulp; Mix according to the dry weight weight ratio of 1: 1 above-mentioned 2, do not add waterproofing agent and fire retardant.During hot pressing, the patrix temperature is controlled at 110 ℃, and hot pressing counterdie temperature is controlled at 120 ℃ of left and right, and total hot pressing time is 60s.All the other all are equal to embodiment 4.
The thickness of fiber wallboard is 2.5mm; Height of concave convex is 5mm.
This fiber wallboard compression strength is 〉=200N, and its plane tensile strength is 0.63Mpa, and plate body density is 0.60g/cm
3
Embodiment 9, a kind of method of utilizing wet processing to prepare fiber wallboard,
Change the dry weight 60% primary colors bamboo pulp in embodiment 4 into dry weight 90% white reed pulp, change the broomcorn straw mechanical pulp of dry weight 10% into dry weight 10% maize straw mechanical pulp; Mix according to the dry weight weight ratio of 1: 1 above-mentioned 2, add the waterproofing agent of raw material dry weight 10% and the fire retardant of raw material dry weight gross weight 30%.All the other are with embodiment 4.
The thickness of fiber wallboard is 2.5mm; Height of concave convex is 5mm.
This fiber wallboard compression strength is 〉=200N, and its plane tensile strength is 0.64Mpa, and plate body density is 0.63g/cm
3
Water proofing property and flame retardant effect all meet national examination criteria.
At last, it is also to be noted that, what more than enumerate is only several specific embodiments of the present invention.Obviously, the invention is not restricted to above embodiment, many distortion can also be arranged.All distortion that those of ordinary skill in the art can directly derive or associate from content disclosed by the invention all should be thought protection scope of the present invention.
Claims (7)
1. method of utilizing wet processing to prepare fiber wallboard is characterized in that comprising the following steps successively:
1), slurrying:
Non-wood type natural plant fibre slurry and grass slurry are mixed according to 1: 2/3～1.5 dry weight weight ratio, become raw material; Perhaps, take non-wood type natural plant fibre slurry as raw material;
Thin up is dredged slurry in above-mentioned raw materials, must mix slurry after uniform stirring; The raw material dry weight accounts for 3.0～5.0% of mixed slurry weight amount;
Described non-wood type natural plant fibre slurry is bamboo pulp, cane syrup, straw pulp, reed pulp or secondary stock;
Described grass slurry adopts grass stalk or gramineous lawn to make, its manufacture craft is as follows: the grass stalk after first drying or gramineous lawn removal of impurities, then be ground into the length of 1～5cm, 60～the 72h that is soaked in water again utilizes kneading or grinding leaser to make the grass slurry; Described grass stalk is rice straw, maize straw, wheat stalk, corncob, broomcorn straw or Barley straw, and described gramineous lawn is Festuca Arundinacea, rye grass or annual bluegrass;
2), storage slurry:
Above-mentioned mixing slurry is put into pulp storage tank, be watered dilution, after uniform stirring, get slurries; Described raw material dry weight accounts for 0.3～0.6% of slurry weight;
3), filtering molding:
Above-mentioned slurries are input to carry out the Squeeze dewatering moulding in die cavity, get wet base; The wet base of gained be in die cavity slurry weight 1.0～10.0%;
4), thermocompression forming and drying:
Above-mentioned wet base is transferred in hot-die, at 0.5～5.0kg/cm
3Pressure and the temperature of 98～280 ℃ under hot pressing 18～60s, and remove the moisture that produces in hot pressing; Get fiber wallboard.
2. the method for utilizing wet processing to prepare fiber wallboard according to claim 1, it is characterized in that: be described step 1): add waterproofing agent and/or fire retardant and water to dredge slurry in raw material, uniform stirring must mix slurry; Waterproofing agent is 2.0%～15.0% of raw material dry weight, and fire retardant is 1.0%～45.0% of raw material dry weight.
3. the method for utilizing wet processing to prepare fiber wallboard according to claim 1 is characterized in that: waterproofing agent and/or fire retardant are added water dilute, fully after dissolving spray coating liquor; With step 3) the wet base of gained sprays first with above-mentioned spray coating liquor; And then carry out step 4) thermocompression forming with dry, and in step 4) in carry out simultaneously the spray again of spray coating liquor; Twice spray waterproofing agent total amount used is 2.0%～15.0% of die cavity Raw dry weight, and twice spray fire retardant total amount used is 1.0%～45.0% of die cavity Raw dry weight.
4. the according to claim 2 or 3 described methods of utilizing wet processing to prepare fiber wallboard, it is characterized in that: described fire retardant is organic silicon fibre retardant, phosphorus-nitrogen containing flame retardant or inorganic combustion inhibitor; Described waterproofing agent is organosilicon series waterproofing agent or environment-friendly type waterproofing agent.
5. the method for utilizing wet processing to prepare fiber wallboard according to claim 4, it is characterized in that: described organic silicon fibre retardant is the water-soluble organic silicon fire retardant.
6. the method for utilizing wet processing to prepare fiber wallboard according to claim 5, is characterized in that: be described step 4) at 1.5～2.5kg/cm
3Pressure and the temperature of 170～265 ℃ under hot pressing 18～60s.
7. the method for utilizing wet processing to prepare fiber wallboard according to claim 6, is characterized in that: described step 3) at 0.5～2.0Kg/cm
3Pressure cold pressing.
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| CN 200910168626 CN101638874B (en) | 2008-08-28 | 2009-08-24 | Method for preparing fiber wallboard through wet process |
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