CN110591541A - Single-component polyurethane waterproof coating production line - Google Patents
Single-component polyurethane waterproof coating production line Download PDFInfo
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- CN110591541A CN110591541A CN201910983918.5A CN201910983918A CN110591541A CN 110591541 A CN110591541 A CN 110591541A CN 201910983918 A CN201910983918 A CN 201910983918A CN 110591541 A CN110591541 A CN 110591541A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 55
- 239000004814 polyurethane Substances 0.000 title claims abstract description 33
- 229920002635 polyurethane Polymers 0.000 title claims abstract description 33
- 239000011248 coating agent Substances 0.000 title abstract description 15
- 238000000576 coating method Methods 0.000 title abstract description 15
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 89
- 230000018044 dehydration Effects 0.000 claims abstract description 88
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 43
- 239000000463 material Substances 0.000 claims abstract description 41
- 238000000034 method Methods 0.000 claims abstract description 32
- 238000006243 chemical reaction Methods 0.000 claims abstract description 25
- 239000003973 paint Substances 0.000 claims abstract description 15
- 238000001816 cooling Methods 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 238000004321 preservation Methods 0.000 claims abstract description 8
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 34
- 239000000843 powder Substances 0.000 claims description 33
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 31
- 229920000570 polyether Polymers 0.000 claims description 31
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 19
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 17
- 238000002156 mixing Methods 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 239000000084 colloidal system Substances 0.000 claims description 11
- 238000005086 pumping Methods 0.000 claims description 8
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical compound ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 claims description 7
- 150000002009 diols Chemical class 0.000 claims description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 239000002826 coolant Substances 0.000 claims description 5
- 239000000945 filler Substances 0.000 claims description 5
- 239000004014 plasticizer Substances 0.000 claims description 5
- 239000002904 solvent Substances 0.000 claims description 5
- 239000012948 isocyanate Substances 0.000 claims description 4
- 150000002513 isocyanates Chemical class 0.000 claims description 4
- 238000007664 blowing Methods 0.000 claims description 2
- 238000004078 waterproofing Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 15
- 238000010924 continuous production Methods 0.000 abstract description 5
- 208000005156 Dehydration Diseases 0.000 description 77
- 238000003756 stirring Methods 0.000 description 15
- 238000005265 energy consumption Methods 0.000 description 12
- 239000000203 mixture Substances 0.000 description 7
- 238000003860 storage Methods 0.000 description 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 6
- 239000006185 dispersion Substances 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 239000000110 cooling liquid Substances 0.000 description 5
- 229910001873 dinitrogen Inorganic materials 0.000 description 5
- 239000011344 liquid material Substances 0.000 description 5
- 230000035484 reaction time Effects 0.000 description 5
- 239000000428 dust Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000004615 ingredient Substances 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000011049 filling Methods 0.000 description 3
- 238000013329 compounding Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000000379 polymerizing effect Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000009924 canning Methods 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000012809 cooling fluid Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 150000004658 ketimines Chemical class 0.000 description 1
- 239000002075 main ingredient Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000011527 polyurethane coating Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 235000012222 talc Nutrition 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/08—Polyurethanes from polyethers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/80—Processes for incorporating ingredients
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Polyurethanes Or Polyureas (AREA)
Abstract
The invention relates to a single-component polyurethane waterproof paint production device, in particular to a single-component polyurethane waterproof paint production line which comprises a batching kettle, a dehydration kettle and a polymerization reaction kettle, wherein the batching kettle, the dehydration kettle and the polymerization reaction kettle are sequentially communicated, and the batching kettle, the dehydration kettle and the polymerization reaction kettle are respectively provided with an independent heating device, an independent heat preservation device and an independent cooling device. In the process of producing the polyurethane waterproof coating, materials are respectively subjected to production operation through the three reaction kettles, and each reaction kettle can keep the temperature required by the reaction in the stage, so that the temperature of the reaction kettle does not need to be repeatedly adjusted and controlled back and forth in the reaction process, and energy can be saved; moreover, the invention has continuous production and improves the production efficiency.
Description
Technical Field
The invention relates to polyurethane production equipment, in particular to a single-component polyurethane waterproof coating production line.
Background
The polyurethane waterproof paint is a novel waterproof material, has high strength, high elongation, high solid content and high bonding force, can be constructed at normal temperature, is simple and convenient to operate, is non-toxic and harmless, and has excellent weather resistance and ageing resistance.
The production process of the polyurethane waterproof coating comprises the steps of proportioning, dehydrating and polymerizing, and then filling, wherein in the production process, the production temperature of proportioning and dehydrating is high and is kept constant at about 110 ℃, the temperature of polymerization is slightly low and is kept constant at about 70-80 ℃.
The production line of the polyurethane waterproof coating in the traditional production process carries out the processes of material mixing, dehydration and polymerization reaction in a reaction kettle, and is called integral forming for short, namely, the material mixing, the material adding for dehydration and the material adding for polymerization reaction are carried out firstly. The defects of the prior art are that the temperature difference between the reaction temperature of the batching and dehydration stage and the reaction temperature of the polymerization stage is large, the temperature of the reaction kettle needs to be raised in the production process to carry out the batching and dehydration stage, and then the temperature is lowered to carry out the polymerization reaction, so that the circulation is repeated, the energy consumption is large, the production process can only be carried out in a single circulation manner, the consumed time is long, and the comprehensive production efficiency is low.
Disclosure of Invention
The invention aims to provide a single-component polyurethane waterproof coating production line, which reduces the energy consumption of the polyurethane waterproof coating in the production process; and the production is continuous, and the production efficiency is improved.
The invention aims to be realized by the following technical scheme:
the single-component polyurethane waterproof coating production line comprises a batching kettle, a dehydration kettle and a polymerization reaction kettle, wherein the batching kettle, the dehydration kettle and the polymerization reaction kettle are sequentially communicated, and the batching kettle, the dehydration kettle and the polymerization reaction kettle are respectively provided with an independent heating device, an independent heat preservation device and an independent cooling device.
Through adopting above-mentioned technical scheme, at the in-process of production polyurethane waterproof coating, the material can produce the operation respectively through three reation kettle, and every reation kettle can both keep its required temperature of this stage reaction, just so need not to make a round trip to adjust control repeatedly reation kettle's temperature at the in-process of reaction, can the energy saving.
The invention is further configured to: the ratio of the total volume of the batching kettle, the dehydration kettle and the polymerization reaction kettle is 1:1: 2.
By adopting the technical scheme, the difference between the reaction time in the batching kettle and the reaction time in the dehydration kettle is small in comprehensive, and the sum of the reaction time in the polymerization reaction kettle and the time for canning materials is twice as long as the reaction time of the batching kettle, so that after the total volume ratio of the batching kettle, the dehydration kettle and the polymerization reaction kettle is set to be 1:1:2, the effect of continuous production can be realized, the vacancy rate of production equipment is reduced, and the production efficiency is improved.
The invention is further configured to: the batching kettle, the dehydration kettle and the polymerization kettle are all communicated and provided with a vacuum pump system, the vacuum pump system comprises a first vacuum pump set and a second vacuum pump set, the first vacuum pump set is communicated with the batching kettle and the polymerization kettle, and the second vacuum pump set is communicated with the dehydration kettle.
Through adopting above-mentioned technical scheme, all need under vacuum environment at the in-process of batching cauldron, dehydration cauldron and polymerization reaction cauldron production, wherein first vacuum pump group is exactly the power supply that provides vacuum environment for batching cauldron and polymerization reaction cauldron, and second vacuum pump group is the power supply that provides vacuum environment for the dehydration cauldron.
The invention is further configured to: the cooling medium of the first vacuum pump group and the second vacuum pump group adopts low-viscosity polyether glycol.
Through adopting above-mentioned technical scheme, adopt low viscosity polyether glycol as the medium of vacuum pump package, can make polyether glycol heat up at vacuum pump moving in-process, polyether glycol after the intensification is stored in the storage tank, directly pumps polyether glycol after the heating to the batching cauldron when needing to use, can save the energy of reheating polyether glycol, reduce the energy consumption, promote the utilization ratio of the energy.
The invention is further configured to: the second vacuum pump group comprises a second vacuum pump and a Roots blower, an air suction port of the Roots blower is communicated with the dehydration kettle, and an air suction port of the second vacuum pump is communicated with an air outlet of the Roots blower.
Through adopting above-mentioned technical scheme, adopt the compound mode of roots's fan and vacuum pump, can promote the vacuum to dehydration cauldron evacuation to promote dehydration kettle's dehydration efficiency.
The invention is further configured to: a pumping pump and a colloid mill are communicated between the batching kettle and the dehydration kettle through a pipeline.
Through adopting above-mentioned technical scheme, all be provided with agitating unit in batching cauldron and the dehydration cauldron, mix powder and liquid material, promote reaction efficiency, after setting up the colloid mill between batching cauldron and dehydration cauldron, the material can pass through the colloid mill from the in-process that the batching cauldron was carried to the dehydration cauldron, can guarantee the material intensive mixing under the effect of colloid mill, just so can reduce the power of agitating unit in the dehydration cauldron to save electric energy consumption.
The invention is further configured to: the bottom of the batching kettle is communicated with a powder pipe.
Through adopting above-mentioned technical scheme, at the in-process of batching, the powder can be followed the bottom of batching cauldron and added to promote the mixture degree of consistency of powder and liquid material, reduce the mixing degree of difficulty and mix time.
The invention is further configured to: a nitrogen blowing pipe is arranged at the bottom inside the dehydration kettle.
Through adopting above-mentioned technical scheme, at the in-process of dehydration, continuously through the nitrogen drum pipe nitrogen gas of going into to the dehydration cauldron to promote the area of contact of dehydration in-process material and outside gas greatly, promote the efficiency of dehydration by a wide margin, reduce the time of dehydration.
The second purpose of the invention is realized by the following technical scheme:
a preparation method of a polyurethane waterproof coating comprises the following steps:
s1, adding polyether diol, polyether triol, plasticizer and powdery filler into the batching kettle, and keeping a constant temperature and vacuum state;
s2, uniformly mixing the materials in the batching kettle, pouring the materials into a dehydration kettle, and dehydrating at constant temperature in a vacuum state;
s3, pouring the materials in the dehydration kettle into a polymerization reaction kettle after the water content of the materials in the dehydration kettle is less than three ten-thousandth, adding isocyanate, solvent oil and latent curing agent, pumping to a vacuum environment, and preserving heat for reaction.
Through adopting above-mentioned technical scheme, the reaction in batching cauldron, dehydration cauldron and the polymerization reaction cauldron can go on alone, also can guarantee that temperature and pressure in every reation kettle can both the independent control, need not to adjust reaction temperature repeatedly according to the process change to the loss of the energy has been reduced, the utilization ratio of the promotion energy.
The invention is further configured to: in step S1, the powder is fed from the lower end of the compounding tank through a feed pipe.
Through adopting above-mentioned technical scheme, utilize the mode of submerged feeding in the batching cauldron, can make powder and liquid material fully contact, promote the efficiency of compounding.
In summary, the present invention has the following technical effects:
1. by independently arranging the batching kettle, the dehydration kettle and the polymerization reaction kettle, three stages of batching, dehydrating and polymerizing reaction are not influenced mutually and can be carried out simultaneously, the production time is effectively shortened, the production continuity can be realized, and the production efficiency is improved;
2. the preparation kettle, the dehydration kettle and the reaction kettle are independently arranged, so that the temperature can be independently controlled in each stage, a single heating and warming process can be carried out for the preparation and dehydration, and a polymerization reaction kettle can be used for cooling and heat preservation, so that the energy consumption is reduced, and the production cost is reduced;
3. the polyether glycol is used as a medium of the vacuum pump group, so that the polyether glycol can be heated, and the purpose of secondarily utilizing the heating energy consumption of the vacuum pump group is achieved;
4. through set up the colloid mill between batching cauldron and dehydration cauldron, reached and promoted the material and mixed homogeneous degree and storage stability, also can reduce dehydration cauldron's stirring power simultaneously.
Drawings
FIG. 1 is a schematic plan view of the first embodiment;
fig. 2 is a schematic diagram of the arrangement of the second vacuum pump group.
In the figure, 1, a batching kettle; 11. a pump; 12. colloid milling; 13. a powder pipe; 14. a powder bin; 2. a dehydration kettle; 3. a polymerization reaction kettle; 421. a second vacuum pump; 422. a Roots blower; 43. a liquid storage tank.
Detailed Description
The first embodiment is as follows:
as shown in figure 1, this embodiment has introduced a monocomponent polyurethane waterproofing paint production line, including batching cauldron 1, dehydration cauldron 2 and polymerization reaction cauldron 3, batching cauldron 1, dehydration cauldron 2 and polymerization reaction cauldron 3 loop through the pipeline intercommunication to batching cauldron 1, dehydration cauldron 2 and polymerization reaction cauldron 3 all possess independent heating, heat preservation and cooling device, all are provided with the stirring rake in batching cauldron 1, dehydration cauldron 2 and the polymerization reaction cauldron 3. In the production process, the materials are mixed and dehydrated and then enter a reaction stage, and the temperature requirements of three stages are different, so that the mixing kettle 1, the dehydration kettle 2 and the polymerization reaction kettle 3 keep the temperature of the process, the temperature is not required to be repeatedly increased and decreased in the continuous production process, and compared with the prior art, the time and the energy consumption caused by the repeated temperature increase and decrease are greatly saved.
Batching time is close with dehydration time, and reaction time is batching time and dehydration time sum, consequently, sets up batching cauldron 1, dehydration cauldron 2 and reation kettle 3 volume as 1:1:2, not only can the continuous production be realized, but also the vacancy rate of the equipment can be reduced, and the production efficiency is improved.
In actual production process, for improving reaction efficiency, batching cauldron 1, dehydration cauldron 2 and polymerization cauldron 3 all are in vacuum state, and react under the environment of filling nitrogen at best, guarantee the stability of reaction, avoid appearing oxidation or side reaction, consequently need set up the vacuum pump system to batching cauldron 1, dehydration cauldron 2 and polymerization cauldron 3 intercommunication. The maximum vacuum degree of the batching kettle 1 and the polymerization reaction kettle 3 is-0.09 MPa during the reaction; while the dehydration reaction stage requires higher vacuum degree, and the maximum vacuum degree is generally maintained at-0.095 MPa. The vacuum degree of vacuum pumps such as common water ring vacuum pumps and the like cannot meet the requirement, so that a vacuum pump set needs to be additionally designed.
In this embodiment, the vacuum pump system includes a first vacuum pump group and a second vacuum pump group, the first vacuum pump group is respectively communicated with the batching kettle 1 and the polymerization reaction kettle 3, and the second vacuum pump group is communicated with the dehydration kettle 2. The first vacuum pump group is a common vacuum pump group, such as a water ring vacuum pump, a multi-stage water ring vacuum pump, etc., as shown in fig. 2; the second vacuum pump group includes second vacuum pump 421 and roots's fan 422, adopts the compound mode, and roots's fan 422's inlet scoop and dehydration cauldron 2 intercommunication, second vacuum pump 421's inlet scoop and roots's fan 422's air outlet intercommunication. The operation of second vacuum pump 421 produces pressure differential between inlet scoop and the air outlet, forms the vacuum, adds roots's fan 422 and carries out secondary evacuation on the basis of second vacuum pump 421 outlet vacuum, promotes the vacuum in the dehydration cauldron.
And a vacuum sensor for detecting the vacuum degree is arranged in the dehydration kettle 2, the vacuum degree in the dehydration kettle 2 is detected, when the vacuum degree is reduced to a certain value, if the vacuum degree is less than minus 0.09MPa, the combined system of the Roots blower 422 and the second vacuum pump 421 is started simultaneously for vacuumizing until the vacuum degree meets the requirement of minus 0.095MPa, when the vacuum degree is maintained within a specified range, the system automatically closes the Roots blower 422, the operation of the vacuum pump 421 is utilized for maintaining the vacuum degree, and energy is saved.
The water ring vacuum pump that second vacuum pump 421 generally adopted, water ring vacuum pump need the medium at the in-process of operation, and general medium is water, and at the in-process of operation because the shearing action of blade, the temperature can rise step by step, and along with evacuation goes on, the boiling point will reduce when the temperature rises, and the performance of a large amount of moisture evaporation meeting greatly reduced vacuum pump 421 evacuation consequently need cool off constantly to the medium in vacuum pump 421 to guarantee vacuum pump 421's efficiency. The pump cavity shell of the vacuum pump 422 is provided with a cooling cavity, and the cooling cavity is filled with cooling liquid to cool working media in the pump cavity, so that the cooling effect is achieved.
The cooling liquid in the cooling chamber is preferably circulated to prevent the cooling liquid from continuously rising to lower the cooling efficiency, and therefore, as shown in fig. 2, a liquid storage tank 43 is provided in the vacuum pump system, and the liquid storage tank 43 is communicated with the cooling chamber through a pipeline and a pipeline pump to circulate the cooling liquid. The cooling liquid in the liquid storage tank 43 can be water or other media, in this embodiment, the cooling medium is polyether glycol with low viscosity, and the viscosity is 100-300 mPa.S at the normal temperature of 25 ℃. The polyether glycol is a necessary material in the production of polyurethane waterproof paint, and is sent into a batching kettle 1 before reaction, and is batched and mixed with other raw materials after being heated. After the polyether glycol is used as a cooling medium, the temperature of the polyether glycol is gradually increased along with the heat exchange in the cooling process, and the heated polyether glycol is directly pumped into the batching kettle 1, so that the comprehensive utilization of energy is realized. The cooling fluid within reservoir 43 may cool both the first and second vacuum pump sets.
For further promoting dehydration efficiency of dehydration cauldron 2, set up the nitrogen drum pipe in the inside bottom of dehydration cauldron 2, the nitrogen drum pipe is the annular setting best, and nitrogen gas is gone into to the interior drum of dehydration cauldron 2 while stirring at the in-process of dehydration, and during the nitrogen gas bubble was smashed the material of sneaking into in the dehydration cauldron 2 by the stirring rake, promoted material and gaseous area of contact, in the nitrogen gas bubble was sneaked into in the evaporation of water in the material, finally along with nitrogen gas discharges together, has promoted the efficiency of dehydration greatly.
In conventional production line, the stirring rake in batching cauldron 1 and the dehydration cauldron 2 is the triaxial stirring rake, and a middle main stirring rake, both sides set up the dispersion stirring rake respectively promptly, and middle main stirring rake plays main dispersion, and both sides dispersion stirring rake is high-order dispersion and low level dispersion, provides high shear force to it is more even to be convenient for liquid material and powder mixture, needs three motor to drive to carry out work this moment, and the energy consumption is than higher. In this embodiment, as shown in fig. 1, add a pump 11 and colloid mill 12 between batching cauldron 1 and dehydration cauldron 2's pipeline, the material is expected to utilize colloid mill 12 to grind the material to mix to dehydration cauldron 2's in-process in the batching cauldron 1, guarantee the homogeneous degree of material, guarantee the homogeneous degree of the material mixture in dehydration cauldron 2, consequently only need set up the main stirring rake of a low-power in dehydration cauldron 2, and energy consumption is saved, equipment cost and cost of maintenance are reduced, improve dehydration cauldron's gas tightness simultaneously.
The main ingredients in the ingredient kettle 1 are polyether diol, polyether triol and powder, the powder is a mixture of talcum powder and heavy calcium carbonate, the polyether diol and the polyether triol are firstly added into the ingredient kettle 1 in the ingredient process, the powder is added from the upper part of the ingredient kettle 1 in a spiral feeding mode, and then the processes of vacuumizing, heating and stirring are carried out, the liquid-powder contact surface is small in the process, and the mixing efficiency is low, so that the dust of the powder cannot be inhibited. In this embodiment, as shown in fig. 1, the powder material is fed under liquid, a powder material pipe 13 is communicated with the bottom of the blending kettle 1, the powder material pipe 13 is communicated with a powder material bin 14, the polyether diol and polyether triol are added into the blending kettle 1, heating and vacuum pumping are performed (the pressure is controlled to be-0.08 MPa to-0.075 MPa), a valve of the powder material pipe 13 is opened, and the powder material can enter the blending kettle 1 from hydraulic pressure under the vacuum pumping action, so that the powder material and the liquid material are uniformly mixed. In the process of opening the valve of the powder pipe 13, the vacuum valve is in a closed state, so that the dust raising of the powder can be reduced, and the difficulty in environment-friendly dust treatment is reduced.
In summary, the polyurethane production line in this embodiment has the following advantages:
1. the production process of the polyurethane waterproof coating is divided into three stages of burdening, dehydration and polymerization reaction by the novel polyurethane production line, so that the three stages are not influenced mutually and can be carried out simultaneously, the production time is effectively shortened, the production continuity can be realized, and the production efficiency is improved;
2. compared with the production process of integral forming, the single heating and temperature rising process is carried out on the batching kettle 1 and the dehydration kettle 2, and the temperature reduction and heat preservation process is carried out on the polymerization reaction kettle 3, so that the reaction kettle does not need to be repeatedly heated and cooled, the energy consumption is reduced, and the production cost is reduced; the production time of the batching, dehydration and polymerization reaction processes in the production process of the integrated polyurethane is about 20 hours, the production efficiency is improved by about 40 percent after the segmented continuous production, the power consumption of each ton of polyurethane is 140 degrees/ton, and the steam energy consumption is reduced to 0.2m 3/ton;
3. in order to improve the efficiency of the vacuum dehydration stage and solve the storage of polyurethane coating and the fluctuation of product viscosity in the later stage, the invention adopts a powder drying treatment technology, a secondary vacuum pumping technology and a bottom nitrogen filling technology in the design process, increases the air flow and exchange speed of the dehydration kettle 2, and improves the dehydration efficiency of the product and the stability of the product in the later stage;
4. under the shearing and dispersing action of the colloid mill 12, the powder material is dispersed more uniformly, the appearance of the finished coating product is finer and smoother, the product defects are fewer, and the tensile strength and the elongation at break of the finished coating product prepared by the method are improved by about 25 percent compared with those of the traditional method.
Example two:
the embodiment introduces a preparation method of a polyurethane waterproof coating, which specifically comprises the following steps.
S1, adding polyether diol, polyether triol, plasticizer and powder filler into the batching kettle 1, and stirring while keeping constant temperature and vacuum state to uniformly mix the materials. In this example, talc and ground calcium carbonate were used as the powder filler.
S11, drying 15 parts by mass of 800-mesh talcum powder and 20 parts by mass of 800-mesh heavy calcium carbonate for later use, wherein the water content is less than 1 per thousand.
S12, adding 17 parts by mass of polyether diol with molecular weight of 2000, 5 parts by mass of polyether triol with molecular weight of 5600 and 10 parts by mass of plasticizer into a blending kettle 1, opening a main stirring paddle of the blending kettle 1, heating to 80 ℃, adding 0.2 part by mass of carbon black, 0.3 part by mass of dispersant and 0.5 part by mass of anti-settling agent, continuously heating to 100 ℃, vacuumizing to prepare for extracting powder, controlling the pressure of the powder to be-0.08 to-0.075 MPa in a vacuum liquid feeding mode, and keeping a vacuum valve in a closed state in the powder absorbing process to reduce the dust raising of the powder and influence on environmental protection; and the powder feeding valve is controlled by a PLC control system, and the heat is continuously preserved until the temperature reaches 110 ℃ and the dispersion is carried out for 1h at a high speed.
The plasticizer is C9/C10 polymer containing phenol unsaturated aromatic hydrocarbon, and the viscosity is 300-400mp.s at 25 ℃.
The polyether glycol can adopt the cooling medium polyether glycol used for cooling the vacuum pump system in the first embodiment, and energy consumed for heating the polyether glycol is reduced, so that waste heat emitted by the vacuum pump system is recycled, and energy consumption is reduced.
S2, after the materials in the batching kettle 1 are fully reacted, pouring the materials into a dehydration kettle 2, and dehydrating at constant temperature in a vacuum state.
S21, grinding and mixing the materials in the batching kettle 1 by a colloid mill 12, and then feeding the materials into a dehydration kettle 2.
S22, starting the main stirring rotating speed to be controlled at 60-100rpm, controlling the dehydration vacuum degree to be less than or equal to-0.095 MPa, controlling the water content to be less than or equal to 0.3 per mill, controlling the temperature to be 108 +/-2 ℃, and controlling the dehydration time to be 3 hours.
S3, pouring the materials in the dehydration kettle 2 into a polymerization reaction kettle 3 after the water content is less than three ten-thousandth, adding isocyanate, solvent oil and latent curing agent, wherein TDI80/20 is preferably adopted as the isocyanate, 150 # solvent oil is preferably adopted as the solvent oil, and ketimine latent curing agent is preferably adopted as the latent curing agent, pumping to a vacuum environment, and carrying out heat preservation for reaction.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (10)
1. The utility model provides a single component polyurethane waterproofing paint production line, its characterized in that, includes batching cauldron (1), dehydration cauldron (2) and polymerization cauldron (3), and batching cauldron (1), dehydration cauldron (2) and polymerization cauldron (3) communicate in proper order, and batching cauldron (1), dehydration cauldron (2) and polymerization cauldron (3) all dispose independent heating, heat preservation and cooling device.
2. The production line of one-component polyurethane waterproof paint as claimed in claim 1, wherein the ratio of the total volume of the batching kettle (1), the dewatering kettle (2) and the polymerization reaction kettle (3) is 1:1: 2.
3. The production line of one-component polyurethane waterproof paint according to claim 1, characterized in that the batching kettle (1), the dewatering kettle (2) and the polymerization reaction kettle (3) are all communicated and provided with a vacuum pump system, the vacuum pump system comprises a first vacuum pump group and a second vacuum pump group, the first vacuum pump group is communicated with the batching kettle (1) and the polymerization reaction kettle (3), and the second vacuum pump group is communicated with the dewatering kettle (2).
4. The production line of one-component polyurethane waterproof paint as claimed in claim 3, wherein the cooling medium of the first vacuum pump set and the second vacuum pump set is low viscosity polyether glycol.
5. The production line of one-component polyurethane waterproof paint as claimed in claim 3, wherein the second vacuum pump group comprises a second vacuum pump (421) and a Roots blower (422), the suction inlet of the Roots blower (422) is communicated with the dehydration kettle (2), and the suction inlet of the second vacuum pump (421) is communicated with the air outlet of the Roots blower (422).
6. The production line of one-component polyurethane waterproof paint as claimed in claim 1 ~ 5, wherein the batching kettle (1) and the dewatering kettle (2) are communicated with each other through a pipeline and provided with a pumping pump (11) and a colloid mill (12).
7. The production line of one-component polyurethane waterproof paint as claimed in claim 1 ~ 5, wherein the bottom of the batching kettle (1) is communicated with a powder pipe (13).
8. The production line of one-component polyurethane waterproof paint as claimed in claim 1 ~ 5, wherein a nitrogen blowing pipe is arranged at the bottom position inside the dehydration kettle (2).
9. A method for preparing a single-component polyurethane waterproof paint, which is characterized in that the polyurethane waterproof paint production line of claim 1 ~ 8 is adopted, and the method comprises the following steps:
s1, adding polyether diol, polyether triol, plasticizer and powdery filler into the batching kettle (1), and keeping a constant temperature and vacuum state;
s2, uniformly mixing the materials in the batching kettle (1), pouring the materials into a dehydration kettle (2), and dehydrating at constant temperature in a vacuum state;
s3, pouring the materials in the dehydration kettle (2) into a polymerization reaction kettle (3) after the water content is less than three ten-thousandth, adding isocyanate, solvent oil and latent curing agent, pumping to a vacuum environment, and carrying out heat preservation for reaction.
10. The method of claim 9, wherein the powdery filler is fed from the lower end of the batching kettle (1) through a feed pipe in step S1.
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Cited By (1)
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| CN114032021A (en) * | 2021-11-12 | 2022-02-11 | 黄冈凯伦新材料有限公司 | Production process of MPU polyurethane waterproof coating |
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