CN103722631A - Kneading method of urea molding compound - Google Patents
Kneading method of urea molding compound Download PDFInfo
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- CN103722631A CN103722631A CN201310707589.4A CN201310707589A CN103722631A CN 103722631 A CN103722631 A CN 103722631A CN 201310707589 A CN201310707589 A CN 201310707589A CN 103722631 A CN103722631 A CN 103722631A
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Abstract
The invention discloses a kneading method of a urea molding compound. The kneading method is characterized by comprising the following steps: putting raw materials into a vacuum kneading machine to carry out kneading and dewatering, and kneading at the vacuum degree of 740-760mmHg for 50-70 minutes. As the vacuum kneading machine is adopted, the moisture content of the raw materials is reduced to about 25% from average 30%; the moisture content is reduced by 17%; the homogeneity and the porosity of the raw materials are superior to those of the traditional kneading technology; the diameter of the granularity of soft particles is reduced by more than twice; a foundation for increasing the production capacity is created for a drying procedure. Wastewater which is dewatered in vacuum is respectively subjected to primary filtering treatment of a filter and secondary filter-pressing treatment of a filter press, so that the secondarily processed water solution is clear and transparent, and fed back to a methanol production factory for production of a 37% formaldehyde solution (becoming raw materials). Thus, waste is changed into treasures.
Description
Technical field
The invention belongs to urea moulding material manufacture field, relate in particular to a kind of kneading method of urea moulding material.
Background technology
In the production process of graininess urea moulding material, need through mediating this operation, by tentatively synthetic Lauxite (low-molecular-weight resin) and filler (cellulose), pigment, releasing agent, the auxiliary material such as curing agent, under the heating of steam, flood, mix, react, and under the finding time of blower fan, a large amount of water vapours containing trace formaldehyde are discharged, finally become the soft particle of moisture 30% left and right, and carry out next operation and be dried.
In this operation, except discharging a large amount of steam that contain a small amount of formaldehyde, Lauxite temperature of charge lower than 69 ℃ of conditions under, further straight chain shape low-molecular-weight resin is synthesized in polycondensation, make mean molecule quantity higher than the molecular resin amount entering before kneader, and be accompanied by a part of condensation water of producing of polycondensation synthetic reaction, and enter the moisture of incidental about 45^% before kneader with original Lauxite, in the time of 60 minutes, discharge, become moisture approximately 30% soft particle (some is less than 20 diameter) when mediating terminal.
Traditional kneading mode is the kneader that use capacity is 2000L, adopts external jacket Steam Heating material, and in upper cover perforate around, air enters, and upper cover top is pressed blower fan and extracted hot-air out, stirs the material seething and carry out heat exchange in the cold air entering and kneader.By steam and extracted out discharged to high-altitude by blower fan together containing the steam of formaldehyde on a small quantity, thus in kneader in micro-negative pressure duty, during type selecting, as non-pressure vessel, the steam pressure of chuck is generally at 0.2 ~ 0.25MPa.In this process, there is the not reacted a small amount of free formaldehyde of part to follow the pump drainage of steam together discharged to atmosphere, form the impact on environment.
Summary of the invention
For the problem of above-mentioned prior art existence, the invention provides a kind of kneading method of urea moulding material, adopt the kneading form of vacuum dehydration by the collection containing aldehyde water, processing makes it the use circulating, and eliminates and mediate operation to atmospheric pollution.
The problem existing for solving above-mentioned prior art, the technological means that the present invention takes is: a kind of kneading method of urea moulding material, it is characterized in that, raw material is placed in to vacuum kneader and mediates dehydration, vacuum is 740-760mmHg, kneading time is 50-70min, adopt vacuum kneader, material is moisture drops to 25% left and right by average 30%, water content declines 17%, and the uniformity of material, and gas porosity is better than tradition and mediates technique, the granularity diameter of soft particle declines more than 2 times, is to be dried together to have created the basis that increases production capacity; Waste water after vacuum dehydration through filter, carries out single filter respectively and pressure filter carries out secondary press filtration processing, make to reach clear and feed back to Formaldehyde Production factory through the aqueous solution of after-treatment, formalin for the production of 37% (becoming raw material), for production and application, turns waste into wealth.
Further, described vacuum kneader comprises kneader and vacuum unit.
Further, described vacuum unit is selected liquid-ring type vacuum unit, and this feature is oil-containing not in pumping process, by water ring, keeps vacuum, and the water that forms water ring can be recycled.
Further, described vacuum unit comprises main and auxiliaries, and described main frame is also connected with heat exchanger, and described heat exchanger is 50M
2and 20M
2heat exchanger series connection, guarantee the efficient of heat exchanger.The rapid condensation of steam-energy that heat exchanger is deviate from vacuum, reduces the pressure to pump in vacuum unit, pump is normally worked in specified pressure range, and alleviate the load of pump.
Further, described filter adopts active carbon filter, and described pressure filter adopts multi-layer microporous filter membrane pressure filter.
Further, the assembly in whole operation, as kneader inner bag, vacuum pipeline, heat exchanger end socket, tubulation card, receiver, waits and all adopts 3o4 stainless steel, prevents that iron ion from entering in waste water, to eliminate the iron ion producing in waste water.
The kneading method of urea moulding material of the present invention, compares with conventional method, has following advantage:
1. solve in urea moulding material production technology and mediate operation formaldehyde for to atmospheric pollution, reached the target that water circulation is used, turn waste into wealth.
2. mediating operation is feasible by the technique of vacuum dehydration, and the production of urea moulding material or melamine formaldehyde molding compound has been started to new technology, and the reliability of product quality is stepped a stage, and has realized efficient feasible.
3. improved in-situ production environment, protection worker's health.
4. mediate the more original technique specific energy consumption of vacuum dewatering technique and rise to some extent, but because unit dehydrating effect significantly improves, for the integrated production capacity of following process can improve 30% left and right, integrated cost declines 30%.
The specific embodiment
Embodiment 1
Select the vacuum kneader of 2500L to mediate dehydration, its external jacket is selected the 0.4MPa of resistance to steam pressure, but inwall vacuum is not more than the vacuum kneader of 0.1MPa, and vacuum is 750mmHg, and kneading time is 60min.In order to make, vacuum kneader is withstand voltage and stable running is more reliable, and we take the wall thickness of kneader to thicken, the technical measures that the support of two slurry axles is reinforced.
In waste water after vacuum dehydration, the free formaldehyde that contains a small amount of mechanical admixture, we have selected the processed continuously method of secondary, the method for the first order for filtering, filtered aqueous solution impurity is less than or equal to 5 μ; The second level is repeatedly press filtration, through the aqueous solution impurity of press filtration, is less than or equal to 2 μ.To the organic filtering layer in filter, burn in being placed on gas furnace absorption is saturated, the organic substance of its absorption is converted into water and carbon dioxide is realized element.
Described vacuum unit comprises main and auxiliaries, and described main frame is also connected with heat exchanger, and described heat exchanger is 50M
2and 20M
2heat exchanger series connection, guarantee the efficient of heat exchanger.The rapid condensation of steam-energy that heat exchanger is deviate from vacuum, reduces the pressure to pump in vacuum unit, pump is normally worked in specified pressure range, and alleviate the load of pump.For improving the efficiency of summer high temperature dehydration in season.We set the temperature of the coolant water temperature of heat exchanger.When cooling water temperature surpasses design temperature, we produce by freezing unit the water at low temperature of setting and substitute cooling water, keep stable working condition, to guarantee stable dehydrating effect.
Method described in embodiment 1, in the water that the material of test manufacture is deviate from after comparing with limpid distilled water conclusion: do not find pigment and muddy thing, the aqueous solution approaches the transparency of distilled water; Waste water, by filtration treatment, reaches clear, reaches the quality requirement (except containing trace formaldehyde) that formaldehyde factory absorbs formaldehyde institute water.
Claims (6)
1. a kneading method for urea moulding material, is characterized in that, raw material is placed in to vacuum kneader and mediates dehydration, and vacuum is 740-760mmHg, and kneading time is 50-70min; Waste water after vacuum dehydration through filter, carries out single filter respectively and pressure filter carries out secondary press filtration processing.
2. the kneading method of a kind of urea moulding material according to claim 1, is characterized in that, described vacuum kneader comprises kneader and vacuum unit.
3. the kneading method of a kind of urea moulding material according to claim 2, is characterized in that, described vacuum unit is selected liquid-ring type vacuum unit.
4. the kneading method of a kind of urea moulding material according to claim 1, is characterized in that, described vacuum unit comprises main and auxiliaries, and described main frame is also connected with heat exchanger.
5. the kneading method of a kind of urea moulding material according to claim 4, is characterized in that, described heat exchanger is 50M
2and 20M
2heat exchanger series connection.
6. according to the kneading method of a kind of urea moulding material described in claim 1-5 any one, it is characterized in that, described filter adopts active carbon filter, and described pressure filter adopts multi-layer microporous filter membrane pressure filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310707589.4A CN103722631A (en) | 2013-12-20 | 2013-12-20 | Kneading method of urea molding compound |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310707589.4A CN103722631A (en) | 2013-12-20 | 2013-12-20 | Kneading method of urea molding compound |
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| Publication Number | Publication Date |
|---|---|
| CN103722631A true CN103722631A (en) | 2014-04-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310707589.4A Pending CN103722631A (en) | 2013-12-20 | 2013-12-20 | Kneading method of urea molding compound |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103978565A (en) * | 2014-05-07 | 2014-08-13 | 王莹 | Bulk molding compound (BMC) production method capable of improving performances of product |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57114A (en) * | 1980-05-30 | 1982-01-05 | Matsushita Electric Works Ltd | Production of solid urea resin |
| JPS5930815A (en) * | 1982-08-14 | 1984-02-18 | Matsushita Electric Works Ltd | Preparation of solid urea resin |
| CN201400631Y (en) * | 2009-04-24 | 2010-02-10 | 杭州恒达环保实业有限公司 | Plastic cleaning wastewater treatment system |
| CN101921454A (en) * | 2010-05-21 | 2010-12-22 | 常州乔尔塑料有限公司 | Novel low-shrinkage amino moulding compound and preparation method thereof |
| CN102719057A (en) * | 2012-07-06 | 2012-10-10 | 溧阳市乔森塑料有限公司 | Antistatic resin sand and preparation method thereof |
| CN202666575U (en) * | 2012-05-11 | 2013-01-16 | 三江化工有限公司 | Pre-reaction dehydration device for alcohol ether production |
-
2013
- 2013-12-20 CN CN201310707589.4A patent/CN103722631A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57114A (en) * | 1980-05-30 | 1982-01-05 | Matsushita Electric Works Ltd | Production of solid urea resin |
| JPS5930815A (en) * | 1982-08-14 | 1984-02-18 | Matsushita Electric Works Ltd | Preparation of solid urea resin |
| CN201400631Y (en) * | 2009-04-24 | 2010-02-10 | 杭州恒达环保实业有限公司 | Plastic cleaning wastewater treatment system |
| CN101921454A (en) * | 2010-05-21 | 2010-12-22 | 常州乔尔塑料有限公司 | Novel low-shrinkage amino moulding compound and preparation method thereof |
| CN202666575U (en) * | 2012-05-11 | 2013-01-16 | 三江化工有限公司 | Pre-reaction dehydration device for alcohol ether production |
| CN102719057A (en) * | 2012-07-06 | 2012-10-10 | 溧阳市乔森塑料有限公司 | Antistatic resin sand and preparation method thereof |
Non-Patent Citations (1)
| Title |
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| 周本省: "《工业冷却水处理的物理方法及工程应用》", 30 September 2008, 化学工业出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103978565A (en) * | 2014-05-07 | 2014-08-13 | 王莹 | Bulk molding compound (BMC) production method capable of improving performances of product |
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Application publication date: 20140416 |