CN102974277B - Method and device for feeding urea in urea-formaldehyde glue modification process by strong acid technique - Google Patents
Method and device for feeding urea in urea-formaldehyde glue modification process by strong acid technique Download PDFInfo
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- CN102974277B CN102974277B CN201210514223.0A CN201210514223A CN102974277B CN 102974277 B CN102974277 B CN 102974277B CN 201210514223 A CN201210514223 A CN 201210514223A CN 102974277 B CN102974277 B CN 102974277B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a device for feeding urea in an urea-formaldehyde glue modification process by a strong acid technique, which comprises a variable frequency speed regulation motor and a rotary valve, wherein the variable frequency speed regulation motor is connected with a speed reducer; the speed reducer is connected with a rotating shaft; the rotating shaft is provided with the rotary valve; a detachable impeller is installed in the rotary valve, the shaft of the impeller is a hollow sleeve, and the sleeve is matched with the rotating shaft through a shaft key; and the upper part of the rotary valve is provided with a material inlet port, and the lower part of the rotary valve is provided with a material discharge port. The feeding method comprises steps as follows: the variable frequency speed regulation motor drives the speed reducer to rotate, the speed reducer drives the rotating shaft to rotate, the rotating shaft drives the impeller to rotate, and urea positioned in a storage tank above the rotary valve enters the rotary valve through the material inlet port under the action of gravity, and is evenly discharged from the material discharge port under the pushing action of impeller blades and added into the reaction kettle, thereby implementing urea feeding. The rotary valve is utilized to implement controllable stepless smooth speed regulation and even feeding of urea to avoid the gelation phenomenon in the urea-formaldehyde glue modification process by the strong acid technique, thereby enhancing the water resistance and other quality indexes of the urea-formaldehyde resin adhesive and effectively lowering the production cost and energy consumption.
Description
Technical field
The invention belongs to the charging process to the chemical reagent of feed rate sensitivity and device, particularly relate to strong acid process modification urea-formaldehyde glue urea charging process and device.
Background technology
China is wood-based plate first big producing country in the world, and in its adhesive used, Lauxite accounts for more than 80%.But urea-formaldehyde glue also exists the shortcomings such as poor water resistance again, usually adopt the method for adding chemical assistant for improving its performance.Therefore by improving the structure of Lauxite, and resin property is improved.Tradition urea-formaldehyde glue manufacture process may be summarized to be weak base-weak acid-weak base three step (being called for short weak acid technique).This traditional handicraft needs the melamine adding higher proportion as modifier, although the method for this large amount of interpolation melamine improves the water-resistant capacity of urea-formaldehyde resin adhesive, cost also increases substantially.And use strong acid-weak acid-weak base three step (being called for short strong acid technique) glue instead, by improving this body structure of urea-formaldehyde resin adhesive to improve its water-resistant capacity and other quality index, the use of melamine in traditional handicraft can be reduced, energy consumption (2.5 to 3 tons of urea could make one ton of melamine) and cost can be reduced.
Strong acid process modification urea-formaldehyde glue is in urea-formaldehyde resin adhesive, introduce the outstanding army ring of water-fast group (Uron ring), but this technique also exists and easily produces gel, and course of reaction is bad the problem such as to control.
Urea feeding mode traditional is at present generally disposable extraction flashboard, urea in storage tank is allowed to flow rapidly into retort, or with bucket elevator, or fill a cloth bag in storage tank outlet, outlet is pinched to control feed rate again with hand, all there is feed rate too fast, the reinforced uneven and uppity problem of feed rate.
In strong acid technique, reaction system is very responsive to feed rate, slightly accidentally will produce gel immediately and make whole pot inventory disposal.If still adopt traditional approach to feed in raw material to urea, be very easy to produce gel, not only do not reach original target, material waste on the contrary in whole reactor, considerably increase production cost, therefore the feed way needing exploitation one new and new feeding device, it can need with adaptive response in stepless speed regulation.
Summary of the invention
In order to overcome the deficiency of existing feed way and feeding device, avoid adopting the problem easily producing gel caking in strong acid process modification urea-formaldehyde glue process, the invention provides a kind of urea charging process and device of strong acid process modification urea-formaldehyde glue, it is evenly fed in raw material to urea by the effect of stepless speed regulation rotary valve, speed that urea feeds in raw material can be regulated and controled according to the temperature of reaction system simultaneously and avoid the appearance of gel, both reach the water-resistant capacity and other quality index that improve urea-formaldehyde resin adhesive, also effectively reduce production cost and energy consumption.
The present invention is achieved in that
The urea feeding device of strong acid process modification urea-formaldehyde glue, comprises frequency control motor and rotary valve, and described frequency control motor is connected with decelerator, and decelerator is connected with turning cylinder; Turning cylinder is provided with rotary valve; Be provided with removable impeller in rotary valve, the axle of impeller is hollow cover letter, and sleeve is coordinated by axle key with turning cylinder; Material inlet port is arranged at rotary valve top, and material outlet is arranged at rotary valve bottom.
The blade quantity of described impeller is 6 ~ 10.
The valve gap of the rotary valve in the urea feeding device of strong acid process modification urea-formaldehyde glue of the present invention is dismountable, impeller can be taken out and clean.
Feeding device operation principle: under the driving of frequency control motor, drives the vane rotary on main shaft through reductor, and material is sent out to discharging opening from top feed bin equably by wheel rotation drive.
The present invention utilizes the urea feeding device of strong acid process modification urea-formaldehyde glue to carry out the method for feeding in raw material: start power supply, frequency control motor drives decelerator to rotate, decelerator drives turning cylinder to rotate again, turning cylinder impeller is rotated, the urea being positioned at storage tank above rotary valve enters rotary valve from material inlet port under gravity, impeller blade promote under equably from material outlet out add in anti-still realize urea feed in raw material.This feed way ensure that the ratio of every formaldehyde and urea in a flash reaches requirement, operating personnel can change according to temperature in the kettle simultaneously, change the frequency of drive motors, thus change the rotating speed of rotary valve, realize stepless stepless speed control, so both avoid urea feeding quantity to rise and fall sharply and quickly and the process of impact reaction, also control the rate of change of reaction temperature simultaneously, not the unordered release of reason reaction heat and out of control.
Described frequency control motor FREQUENCY CONTROL is at 10 ~ 60Hz, and turning cylinder rotating speed is 5 ~ 25r/min.
The urea charging process of strong acid process modification urea-formaldehyde glue of the present invention and the utilization of device mainly in the urea of strong acid process modification urea-formaldehyde glue feeds in raw material.
In strong acid technique, the pH value of initial stage formalin is adjusted to 1 ~ 2, if continue to use traditional weak acid technique to add urea mode fast, so reactant can produce gel immediately under strong acid environment.Analyze its reason, can think that when adding first urea, urea and formaldehyde too addition reaction occur, generate monomethylolurea (see reaction equation 1) and dimethylol urea (see reaction equation 2).Wherein dimethylol urea, can dewater further and generate water-fast group Uron ring (oxa--3,5 phenodiazine cyclohexyl tetraketone) (see reaction equation 3) under strong acid (pH < 3) condition.
H
2NCONH
2+HCHO→H
2NCONHCH
2OH （1）
2HCHO+H
2NCONH
2→OC（NHCH
2OH）
2 （2）
2HCHO+H
2NCONH
2→OC（NHCH
2OH）
2→O=C（NHCH
2）
2O+H
2O （3）
That is:
Reaction equation (1) and reaction equation (3) are reversible reactions.If only from reaction equation (3), when formaldehyde and urea molecule are than=2, water-fast group Uron ring can be generated, but due to the difference of the equilibrium constant, reaction equation (3) than reaction equation (1) and (2) much slow.Formaldehyde must be excessive, just contributes to the carrying out of reaction equation (3).If it is too fast to add urea, the ratio of local urea and formaldehyde does not reach requirement, then reaction equation (1) and reaction equation (2) easily carry out, and reaction equation (3) then cannot carry out.Uron ring not and generate time, namely methylolurea reacts further with urea and namely enters polycondensation phase (reaction equation 4 to 7 etc.), reaction heat impels again temperature to raise fast to cause reaction rate significantly to accelerate, reactant molecule amount increases rapidly, so form the bidimensional even water-fast macromolecule of three-dimensional structure, cause whole still material generation gelling and scrap.Although this is also know that strong acid technique has the advantage improving resin structure, for security consideration, the reason seldom adopted.
H
2NCONHCH
2OH﹢H
2NCONH
2→H
2NCONHCH
2NHCONH
2﹢H
2O （4）
H
2NCONHCH
2OH﹢H
2NCONHCH
2OH→H
2NCONHCH
2NHCONHCH
2OH﹢H
2O （5）
H
2NCONHCH
2OH﹢HOCH
2NHCONHCH
2OH→HOCH
2NHCONHCH
2NHCONHCH
2OH﹢H
2O （6）
HOCH
2NHCONHCH
2OH﹢HOCH
2NHCONHCH
2OH→OC（NHCH
2OCH
2NH）
2CO﹢2H
2O （7）
…….
Adopt method and apparatus of the present invention to strong acid explained hereafter urea-formaldehyde glue, stepless stepless speed control can be realized by changing the frequency of motor, effectively can control the speed that urea is reinforced, guarantee the uniformity of feeding in raw material, the ratio of regulation and control urea and formaldehyde is reacting in the scope required, make formaldehyde excessive, be conducive to reacting the direction generated to Uron ring and carry out, thus avoid the phenomenon that material produces gel.So both can reduce the consumption of melamine, and reduce production cost, can guarantee the quality of urea-formaldehyde glue, water resistance is good simultaneously.
Beneficial effect of the present invention:
The possibility adopting charging process of the present invention and device to avoid gel in strong acid process modification urea-formaldehyde glue process to produce, also improves the security of production, for produce carry out smoothly and improve the quality of products lay the foundation.After adopting the present invention, the feed rate of urea is controlled, and the change of feeding quantity seamlessly transits, thus ensure that:
1). the coordination of feed rate and material dissolution speed and reaction rate, avoids because feed rate is improper and cause material to produce gel and the problem of scrapping;
2). control frequency control motor well, reinforced every in a flash, the amount of formaldehyde and urea, than all in the scope required, makes reaction carry out along required approach, thus ensure that product quality;
3). it is caused by material reaction heat release that reaction temperature changes, and controls feed rate and also just controls reaction temperature change, than cooling or heating are more effective and energy-conservation indirectly.
Accompanying drawing illustrates:
Fig. 1 is the structural representation of the urea feeding device of strong acid process modification urea-formaldehyde glue of the present invention;
Fig. 2 is the structural representation of impeller in rotary valve of the present invention;
Fig. 3 is that schematic diagram is looked on a left side for rotary valve of the present invention;
Reference numeral: frequency control motor 1, rotary valve 2, decelerator 3, turning cylinder 4, impeller 5, material inlet port 6, material outlet 7.
Detailed description of the invention
Embodiment 1
The urea feeding device (as Suo Shi Fig. 1 ~ 3) of strong acid process modification urea-formaldehyde glue, comprise frequency control motor 1 and rotary valve 2, frequency control motor 1 is connected with decelerator 3, and decelerator 3 is connected with turning cylinder 4; Turning cylinder 4 is provided with rotary valve 2; Be provided with removable impeller 5 in rotary valve 2, the blade quantity of impeller 5 is 8, and the axle of impeller 5 is hollow sleeves, and sleeve is coordinated by axle key with turning cylinder 4; Material inlet port 6 is arranged at rotary valve 2 top, and material outlet 7 is arranged at rotary valve 2 bottom.
The urea feeding device of above-mentioned strong acid process modification urea-formaldehyde glue is utilized to carry out the method for feeding in raw material: to start power supply, frequency control motor 1 is made to drive decelerator 3 to rotate, decelerator 3 drives turning cylinder 4 to rotate again, turning cylinder 4 impeller 5 is rotated, the urea being positioned at storage tank above rotary valve 2 enters rotary valve 2 from material inlet port 6 under gravity, impeller 5 blade promote under equably from material outlet 7 out add in anti-still realize urea feed in raw material.Frequency control motor FREQUENCY CONTROL is at 10 ~ 60Hz, and turning cylinder rotating speed is 5 ~ 25r/min.
Urea charging process of the present invention and device, after applying in the production of strong acid process modification urea-formaldehyde glue, melamine consumption can reduce to the half of weak acid technique, production cost reduces 12-15% than traditional weak acid technique, every quality index of made building template meets Standard, refers to following table.
Template quality and GB Indexes Comparison
Note: sheeting process is that template glue adds 15-20% wholemeal, resin added: 250-300g/m
2(disregarding wholemeal), the 1.3MPa that colds pressing (plate pressure), 40 minutes, hot pressing: 1.3MPa (plate pressure), 110 DEG C, 20 points.
Embodiment 2
The urea feeding device of strong acid process modification urea-formaldehyde glue, comprise frequency control motor 1 and rotary valve 2, frequency control motor 1 is connected with decelerator 3, and decelerator 3 is connected with turning cylinder 4; Turning cylinder 4 is provided with rotary valve 2; Be provided with removable impeller 5 in rotary valve 2, the blade quantity of impeller 5 is 10, and the axle of impeller 5 is hollow sleeves, flutedly in sleeve matches with the bar shaped key of turning cylinder 4 projection; Material inlet port 6 is arranged at rotary valve 2 top, and material outlet 7 is arranged at rotary valve 2 bottom.
The urea feeding device of above-mentioned strong acid process modification urea-formaldehyde glue is utilized to carry out the method for feeding in raw material: to start power supply, frequency control motor 1 is made to drive decelerator 3 to rotate, decelerator 3 drives turning cylinder 4 to rotate again, turning cylinder 4 impeller 5 is rotated, the urea being positioned at storage tank above rotary valve 2 enters rotary valve 2 from material inlet port 6 under gravity, impeller 5 blade promote under equably from material outlet 7 out add in anti-still realize urea feed in raw material.Frequency control motor FREQUENCY CONTROL is at 20 ~ 40Hz, and turning cylinder rotating speed is 10 ~ 20r/min.
Urea charging process of the present invention and device, after applying in the production of strong acid process modification urea-formaldehyde glue, melamine consumption can reduce to the half of weak acid technique, production cost reduces 12-15% than traditional weak acid technique, every quality index of made building template meets Standard, refers to following table.
Template quality and GB Indexes Comparison
Note: sheeting process is that template glue adds 15-20% wholemeal, resin added: 250-300g/m
2(disregarding wholemeal), the 1.3MPa that colds pressing (plate pressure), 40 minutes, hot pressing: 1.3MPa (plate pressure), 110 DEG C, 20 points.
Claims (3)
1. utilize the urea feeding device of strong acid process modification urea-formaldehyde glue to carry out the method for feeding in raw material, it is characterized in that: the urea feeding device of described strong acid process modification urea-formaldehyde glue, comprise frequency control motor (1) and rotary valve (2), frequency control motor (1) is connected with decelerator (3), and decelerator (3) is connected with turning cylinder (4); Turning cylinder (4) is provided with rotary valve (2); Be provided with removable impeller (5) in rotary valve (2), the axle of impeller (5) is hollow sleeve, and sleeve is coordinated by axle key with turning cylinder (4); Material inlet port (6) is arranged at rotary valve (2) top, and material outlet (7) is arranged at rotary valve (2) bottom; Described reinforced method starts power supply, frequency control motor (1) drives decelerator (3) to rotate, decelerator (3) drives turning cylinder (4) to rotate again, turning cylinder (4) impeller (5) is rotated, the urea being positioned at rotary valve (2) top storage tank enters rotary valve (2) from material inlet port (6) under gravity, out enters anti-still in that to realize urea reinforced under the blade of impeller (5) promotes equably from material outlet (7).
2. the urea feeding device of strong acid process modification urea-formaldehyde glue that utilizes according to claim 1 carries out the method for feeding in raw material, and it is characterized in that: described frequency control motor (1) FREQUENCY CONTROL is at 10 ~ 60Hz, and turning cylinder (4) rotating speed is 5 ~ 25 r/min.
3. utilize the urea feeding device of strong acid process modification urea-formaldehyde glue to carry out the application of charging process as defined in claim 1, it is characterized in that: its utilization in the urea of strong acid process modification urea-formaldehyde glue feeds in raw material.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210514223.0A CN102974277B (en) | 2012-12-05 | 2012-12-05 | Method and device for feeding urea in urea-formaldehyde glue modification process by strong acid technique |
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|---|---|---|---|
| CN201210514223.0A CN102974277B (en) | 2012-12-05 | 2012-12-05 | Method and device for feeding urea in urea-formaldehyde glue modification process by strong acid technique |
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| CN102974277A CN102974277A (en) | 2013-03-20 |
| CN102974277B true CN102974277B (en) | 2015-01-14 |
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| CN104329502A (en) * | 2014-10-28 | 2015-02-04 | 陆锁根 | Non-pollution ceramic rotary blanking valve |
| CN107504803A (en) * | 2017-07-14 | 2017-12-22 | 嘉兴石化有限公司 | A kind of method of CTA drying machines blanking rotary valve Anti-blockage |
| CN112094144B (en) * | 2020-08-31 | 2022-10-11 | 内蒙古博隆生态科技有限公司 | Comprehensive utilization device for turning agricultural wastes into valuables |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101274231A (en) * | 2007-12-25 | 2008-10-01 | 上海威泽尔机械设备制造有限公司 | Self-suction batch feeder |
| CN201441904U (en) * | 2009-05-30 | 2010-04-28 | 潍坊世华化工有限公司 | Automatic powdery material feeding device of reaction kettle |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101274231A (en) * | 2007-12-25 | 2008-10-01 | 上海威泽尔机械设备制造有限公司 | Self-suction batch feeder |
| CN201441904U (en) * | 2009-05-30 | 2010-04-28 | 潍坊世华化工有限公司 | Automatic powdery material feeding device of reaction kettle |
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Inventor after: Dong Huaping Inventor after: Wan Yang Inventor after: Lai Wenjing Inventor before: Liu Youyan Inventor before: Zhang Yunming |
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| CP03 | Change of name, title or address | ||
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Address after: 537116 Guigang the Guangxi Zhuang Autonomous Region Industrial Park (stone card) main garden Patentee after: Guangxi Huasheng Wood Industry Co., Ltd. Address before: 530004 Nanning University Road, the Guangxi Zhuang Autonomous Region, No. 100 Patentee before: Guangxi University |