CN103085147A - Production method of medium- and high-density fiberboard ultralow in formaldehyde emission - Google Patents
Production method of medium- and high-density fiberboard ultralow in formaldehyde emission Download PDFInfo
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Abstract
The invention relates to a production method of a medium- and high-density fiberboard ultralow in formaldehyde emission. 14-18% of melamine-modified urea resin ultralow in formaldehyde content is added. Internal releasing agent accounting for 0.3-0.5% of the total amount of resin glue is added and mixed into the resin. 0.5-1.0kg.m<3> of resin crosslinking agent is independently added to a glue application spot or is mixed with 1.5-2.5% of compound complexing agent to be added to the glue application spot. By the use of the production method, the contradiction between formaldehyde emission and product quality and yield is overcome, product quality is stable, formaldehyde emission is 2.0-3.0mg/100g, and the production method is available for industrial batch production.
Description
Technical field
The invention provides a kind of manufacture method of ultra-low formaldehyde burst size medium and high density fibre panel.
Background technology
Medium and high density fibre panel is take wood fibre or other plant fiber as raw material, through the fiber preparation, applies synthetic resin (in the majority with Lauxite at present), under the heating pressurized conditions, and a kind of sheet material that is pressed into.Since the production technology of U.S.'s invention sixties in last century wood fibre density board, density board with it fine and close and uniformly quality, good machining property be widely used in the fields such as furniture, indoor decorating, building, packing, the ultrathin sheet material of part high density marches the IT application field as the electronic circuit printed panel.Along with economic growth and social progress, living standard improves constantly, and people more and more pay attention to the quality of life, and the low-carbon environment-friendly theory is rooted in the hearts of the people, and the public has had consciously pursuit for living environment in good health.Under such prerequisite, popular demand has been complied with in the development of ultra-low formaldehyde content medium and high density fibre panel.
In density board, the source of formaldehyde mainly contains the following aspects:
The free state formaldehyde of complete reaction not in the production resin process;
During formaldehyde and urea were synthetic, the unstable groups such as the ehter bond that may form, hemiacetal discharged formaldehyde when sheet material hot pressing.
In resin curing process, easily form unsettled ehter bond between the methylol active group, easy fracture discharges formaldehyde in the sheet material use procedure.
Density board in use, resin is subject to the effect of moisture content and light and aging, constantly decomposes to produce formaldehyde and discharge.Large quantity research and production all show the effective ways that reduce the density board burst size of methanal: the formaldehyde and the urea mol ratio that reduce glue.At present, the core technology of domestic production ultra-low formaldehyde burst size medium and high density fibre panel is: adopt low mol ratio Lauxite synthetic technology, produce the Lauxite of too low free formaldehyde content, for the production of satisfying the ultra-low formaldehyde content medium and high density fibre panel, but this technology there are the following problems: board cost significantly increases; Production line production capacity degradation; Production process is difficult to stable control; The physical and mechanical property of sheet material, especially burst size of methanal and thickness swelling rate are difficult to stable control.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of ultra-low formaldehyde burst size medium and high density fibre panel
For solving the problems of the technologies described above, the present invention realizes like this
The manufacture method of ultra-low formaldehyde burst size medium and high density fibre panel, comprise the raw material peeling, chip, screen, washing, boiling, defibrator process, applying glue, fiber drying, sorting, mat formation, precompressed, hot pressing, cutting edge, turnover panel are cooling, modified, sanding, it is characterized in that:
Defibrator process pressure is 7-8bar, cooking pressure 7-8bar, digestion time 3-4min; Be dried to fiber moisture 10-15%;
Described applying glue step specifically comprises the following steps:
(1), the preparation low formaldehyde content melamine modified urea-formaldehyde glue, the addition of cyanurotriamide modified urea resin glue accounts for the 14%-18% of bone dry fiber weight ratio;
(2), add separately or mix with curing agent and add resin cross-linking agent, the use amount 0.5-1.0kg/m of crosslinking agent in applying glue place
3,Hardener dose 1.5-2.5%;
(3), be cooled to 50 ℃, add inner pattern releasing agent applicable, inner pattern releasing agent applicable accounts for the 0.3%-0.5% of urea-formaldehyde glue gross weight, stirs after adding, and is cooled to 40 ℃, adds lye pH adjustment to 7.5-8.2, plastic emitting.
The manufacture method of aforesaid ultra-low formaldehyde burst size medium and high density fibre panel is characterized in that the melamine modified urea-formaldehyde glue preparation process of described low formaldehyde content is as follows:
(1), at first add formaldehyde in reactor, regulate pH to 8.8～9.0 with sodium hydroxide solution after stirring, add melamine and first part of urea of 85 % by weight, stir after 10-15 minute, be warming up to gradually 90-95 ℃, insulation reaction 20-25 minute; First part of urea addition accounts for the 40-45% of urea gross weight;
Add second part of urea, after insulation reaction 10-15 minute, cool to 80-85 ℃, add formic acid to transfer pH to 6.40～6.60, temperature is controlled at 85-90 ℃, and a polycondensation end viscosity was at 18.5～19.5 seconds; Add first part of auxiliary agent, cool to 88 ℃ of left and right and add the 3rd part of urea and residue 15% melamine, be reacted to viscosity under 78 ℃ of-82 ℃ of conditions is 18.5-19.5 second always; Add second part of auxiliary agent and the 4th part of urea, insulation reaction 10 minutes; Fast cooling is during to 45-50 ℃, and hydro-oxidation sodium solution conditioned reaction liquid pH value is 7.8-8.2; Ph and viscosity are surveyed in sampling, and product is pumped out to basin; Second part of urea accounts for the 5.0-5.5% of urea total amount; The 3rd part of urea accounts for the 19.0-20.0% of urea total amount; Described auxiliary agent is ET600, and first part of auxiliary agent accounts for the 0.20-0.25% of glue gross weight; Second part of auxiliary dosage accounts for the 0.10-0.12% of glue gross weight; The amount of melamine accounts for the 2.5-5.5% of glue gross weight.
The manufacture method of aforesaid ultra-low formaldehyde burst size medium and high density fibre panel is characterized in that the melamine modified urea-formaldehyde glue preparation process of described low formaldehyde content is as follows:
(1), at first add formaldehyde in reactor, regulate pH to 8.8～9.0 with sodium hydroxide solution after stirring, add melamine and first part of urea of 85 % by weight, stir after 10 minutes, be warming up to gradually 90-91 ℃, insulation reaction 20 minutes; First part of urea addition accounts for 42.9% of urea gross weight;
Add second part of urea, insulation reaction cooled to 83-85 ℃ after 15 minutes, added formic acid to transfer pH to 6.40～6.60, and temperature is controlled at 88-90 ℃, and a polycondensation end viscosity was at 18.5～19.5 seconds; Add first part of auxiliary agent, cool to 88 ℃ of left and right and add the 3rd part of urea and residue 15% melamine, be reacted to viscosity under 78 ℃ of-82 ℃ of conditions is 18.5-19.5 second always; Add second part of auxiliary agent and the 4th part of urea, insulation reaction 10 minutes; During fast cooling to 46 ℃, hydro-oxidation sodium solution conditioned reaction liquid pH value is 7.8-8.2; Ph and viscosity are surveyed in sampling, and product is pumped out to basin; Second part of urea accounts for 5.1% of urea total amount; The 3rd part of urea accounts for 19.8% of urea total amount; Described auxiliary agent is ET600, and first part of auxiliary agent accounts for 0.23% of glue gross weight; Second part of auxiliary dosage accounts for 0.115% of glue gross weight; The amount of melamine accounts for the 2.5-5.5% of glue gross weight.
The manufacture method of aforesaid ultra-low formaldehyde burst size medium and high density fibre panel, it is characterized in that described curing agent comprises following component: water, ammonium chloride, hexa, boron chloride, triethanolamine and phosphoric acid, the percetage by weight of each component is: water 70%-2%, ammonium chloride 19-21%, hexa 1.5-2.5%, boron chloride 2-4%, triethanolamine 1.5-2.5%, phosphatase 11-3%.The invention provides that a kind of low cost, high-quality, production technology are simple, the efficient environmental protection density plate of mass.Be embodied in following some:
(1), realize serialization High-efficient Production in enormous quantities, the press day per unit area yield of producing 20 ten thousand steres per year can reach 1000 sides left and right, moulding: hot pressing factor 7.1-7.2.Density 850kg/m
3, plate moisture content 4.5-6% directly mixes use with inner pattern releasing agent applicable with glue, simple to operate, solves sticking press steel belt problem;
(2), solve the contradictory problems of burst size of methanal and product quality, the burst size of methanal of product can reach 2.0-3.0mg/100g, reaches the E0 grade standard, and constant product quality.7.8mm, the 10.8mm medium and high density fibre panel main performance index of the present invention's preparation are as shown in table 1:
Table 1
(4), at present, the large-scale production in batches of this product, offer the sage resemble wait famous brand name produce the F**** floor and outlet Japanese etc.
Description of drawings
Fig. 1 is process chart of the present invention.
The specific embodiment
The present invention is described in further detail below in conjunction with the specific embodiment.In following process, the alkali lye of the adjusting pH value of using is sodium hydroxide solution.
Fig. 1 is process chart of the present invention.With reference to shown in Figure 1, a kind of manufacture method of ultra-low formaldehyde burst size medium and high density fibre panel specifically comprises the following steps:
(1), raw material peeling: mainly take poplar, pine, weedtree as raw material, carry out peeling;
(2), chip and screen: by wood chipping equipment, above-mentioned trees being cut into the wood chip of length and width 15-25cm, thickness 5cm left and right, for excessive (greater than 55cm) or cross spile (less than 4mm) and must through Screening Treatment, guarantee chip quality and form requirement.
(3), washing: because of mixing, sandstone are arranged, the impurity such as metal, body refuse, so wood chip must be through the washing processing, but this process has increased the moisture content of wood chip;
(4), boiling: the wood chip of washing enters pre-boiling cylinder to carry out pre-boiling cylinder and carries out pre-boiling, wood chip is heated evenly carries out preliminarily softened, through the plunger spiral, wood chip is sent to the boiling cylinder again and soften processing, wood chip boiling under HTHP, pre-boiling, cooking pressure are controlled at 7-8bar, and the time is adjustable;
(5), defibrator process: the wood chip of boiling is by discharging screw defibrator process feed, and the wood chip of boiling becomes fiber by abrasive disc solution fibre between mill.Be to improve the fiber water proofing property, adopt the mode of adding paraffin in the grinding machine, defibrator process: mill chamber pressure 7-8bar, cooking pressure 7-8bar, digestion time is 3-4min approximately;
(6), applying glue: each component of impregnation is made solution, send into measuring tank with pump (water is direct), the measuring tank liquid level presets, the start and stop of control pump, the glue that modulates by the applying glue pump through mixing with fiber in blow-off pipe after nozzle atomization, applying glue, resin added 14%-18%, paraffin consumption 7-7.5kg/m
3, curing agent 1.5-2.5%;
(7), dried, classified: the fiber drying pipeline of applying glue is dried to fiber moisture 10-11%, delivers to the fiber feed bin after cyclone separator and sorting unit carry out sorting;
(8), moulding: the fiber of fiber feed bin makes sheet material, hot pressing factor 7.1-7.2 after passing through mat formation preheating, hot pressing cutting edge.Density 850kg/m3, plate moisture content: 4.5-6%;
(9), cooling: as, to need to carry out cooling processing through cooling turnover panel because temperature is higher from press sheet material out, further enhance product performance;
(10), modified: cooled sheet material must carry out the modifier treatment of 3-4 days, and the stress in balance sheet material, moisture content etc. improve its stability;
(11), sanding check: the sheet material after modified carries out sanding according to demand to be processed, and surperficial pre-hardening thickness sand is removed, and plank is cut into certain specification as required.
The total mol ratio 0.922 of cyanurotriamide modified urea resin wherein, addition mol ratio 1.811, secondary polycondensation mol ratio 1.312. urea are divided 4 inputs, and (feed intake with the Un representative, wherein U represents urea at every turn, the number of times that the n representative is added), wherein addition stage urea divides input 2 times.Formaldehyde once drops into, the melamine amount accounts for liquid glue gross weight 4.63%, wherein for the first time three polyamine amounts (feed intake with Mn representative, wherein M represents melamine at every turn, the number of times that the n representative is added) account for liquid glue gross weight 3.94%, the triamine amount accounts for 0.7% of liquid glue gross weight for the second time.Auxiliary agent ET600 addition accounts for 0.35% of glue gross weight, and ET600 accounts for 0.12% for the first time.
Concrete preparation process is as follows:
(1), add formaldehyde, the hydro-oxidation sodium solution is regulated pH to 8.8～9.0, add M1 and U1, stir after 10 minutes, be heated to 78 ℃-80 ℃ in 25-30 minute, be warming up to again 90-91 ℃ after closing thermal source, survey pH(and require to be not less than 7.0, otherwise the hydro-oxidation sodium solution is adjusted), insulation reaction 20 minutes; Add U2, insulation reaction was surveyed pH 〉=6.7 after 15 minutes;
(2), cool to 83-85 ℃, add formic acid minute 2-3 time, transfer pH to 6.40～6.60, temperature is controlled at 88-90 ℃, when viscosity reaches 15 seconds, surveys a viscosity every 5～10 minutes, control viscosity was at 18.5～19.5 seconds (30 ℃);
(3), add immediately part ET-600(1 after reaching viscosity) (different batches that the numeral in bracket is added), and cool to about 88 ℃ and added U3 and M2 with 10-15 minute, be reacted to viscosity under 78 ℃ of-82 ℃ of conditions is 18.5-19.5 second (30 ℃) always;
(4), add ET600(2), add U4, insulation reaction 10 minutes;
(5), during fast cooling to 46 ℃, conditioned reaction liquid pH value is 7.8-8.2;
(6), be cooled to below 42 ℃, ph and viscosity are surveyed in sampling, and product is pumped out to basin.
Curing agent comprises following component: water, ammonium chloride, hexa, triethanolamine and phosphoric acid, the weight ratio of each component is: water 71.7%-75.9%, ammonium chloride 20-22%, hexa 2-3%, triethanolamine 0.1-0.3%, phosphoric acid 2-3%.This curing agent can effectively improve the solidification effect of sheet material and resin.
The above-mentioned specific embodiment does not limit technical scheme of the present invention in any form, and every employing is equal to replaces or technical scheme that the mode of equivalent transformation obtains all drops on protection scope of the present invention.
Claims (3)
1. the manufacture method of ultra-low formaldehyde burst size medium and high density fibre panel, comprise the raw material peeling, chip, screen, washing, boiling, defibrator process, applying glue, fiber drying, sorting, mat formation, precompressed, hot pressing, cutting edge, turnover panel are cooling, modified, sanding, it is characterized in that:
Defibrator process pressure is 7-8bar, cooking pressure 7-8bar, digestion time 3-4min; Be dried to fiber moisture 10-15%;
Described applying glue step specifically comprises the following steps:
The melamine modified urea-formaldehyde glue of preparation low formaldehyde content, the addition of cyanurotriamide modified urea resin glue accounts for the 14%-18% of bone dry fiber weight ratio;
Add separately or mix with curing agent and add resin cross-linking agent, the use amount 0.5-1.0kg/m of crosslinking agent in applying glue place
3,Hardener dose 1.5-2.5%;
Be cooled to 50-55 ℃, add inner pattern releasing agent applicable, inner pattern releasing agent applicable accounts for the 0.3%-0.5% of urea-formaldehyde glue gross weight, stirs after adding, and is cooled to 48-42 ℃, adds lye pH adjustment to 7.5-8.2, plastic emitting.
2. the manufacture method of ultra-low formaldehyde burst size medium and high density fibre panel according to claim 1 is characterized in that the melamine modified urea-formaldehyde glue preparation process of described low formaldehyde content is as follows:
(1), at first add formaldehyde in reactor, regulate pH to 8.8～9.0 with sodium hydroxide solution after stirring, add melamine and first part of urea of 85 % by weight, stir after 10-15 minute, be warming up to gradually 90-95 ℃, insulation reaction 20-25 minute; First part of urea addition accounts for the 40-45% of urea gross weight;
Add second part of urea, after insulation reaction 10-15 minute, cool to 80-85 ℃, add formic acid to transfer pH to 6.40～6.60, temperature is controlled at 85-90 ℃, and a polycondensation end viscosity was at 18.5～19.5 seconds; Add first part of auxiliary agent, cool to 88 ℃ of left and right and add the 3rd part of urea and residue 15% melamine, be reacted to viscosity under 78 ℃ of-82 ℃ of conditions is 18.5-19.5 second always; Add second part of auxiliary agent and the 4th part of urea, insulation reaction 10 minutes; Fast cooling is during to 45-50 ℃, and hydro-oxidation sodium solution conditioned reaction liquid pH value is 7.8-8.2; Ph and viscosity are surveyed in sampling, and product is pumped out to basin; Second part of urea accounts for the 5.0-5.5% of urea total amount; The 3rd part of urea accounts for the 19.0-20.0% of urea total amount; Described auxiliary agent is ET600, and first part of auxiliary agent accounts for the 0.20-0.25% of glue gross weight; Second part of auxiliary dosage accounts for the 0.10-0.12% of glue gross weight; The amount of melamine accounts for the 2.5-5.5% of glue gross weight.
3. the manufacture method of ultra-low formaldehyde burst size medium and high density fibre panel according to claim 1, it is characterized in that described curing agent comprises following component: water, ammonium chloride, hexa, boron chloride, triethanolamine and phosphoric acid, the percetage by weight of each component is: water 70%-2%, ammonium chloride 19-21%, hexa 1.5-2.5%, boron chloride 2-4%, triethanolamine 1.5-2.5%, phosphatase 11-3%.
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