CN102615030A - Microwave/hot air collaborative drying method of paste-like coating - Google Patents
Microwave/hot air collaborative drying method of paste-like coating Download PDFInfo
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- CN102615030A CN102615030A CN201210095604XA CN201210095604A CN102615030A CN 102615030 A CN102615030 A CN 102615030A CN 201210095604X A CN201210095604X A CN 201210095604XA CN 201210095604 A CN201210095604 A CN 201210095604A CN 102615030 A CN102615030 A CN 102615030A
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- 238000000576 coating method Methods 0.000 title claims abstract description 66
- 239000011248 coating agent Substances 0.000 title claims abstract description 64
- 238000001035 drying Methods 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims description 24
- 238000007581 slurry coating method Methods 0.000 claims description 11
- 239000003973 paint Substances 0.000 claims description 9
- 230000003247 decreasing effect Effects 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 abstract description 13
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000001704 evaporation Methods 0.000 abstract description 3
- 230000008020 evaporation Effects 0.000 abstract description 3
- 238000007254 oxidation reaction Methods 0.000 abstract description 3
- 239000000758 substrate Substances 0.000 abstract description 3
- 238000009792 diffusion process Methods 0.000 abstract description 2
- 238000004134 energy conservation Methods 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000007605 air drying Methods 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229920002994 synthetic fiber Polymers 0.000 description 2
- 206010062717 Increased upper airway secretion Diseases 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 238000010981 drying operation Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000009970 fire resistant effect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000007306 functionalization reaction Methods 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 208000026435 phlegm Diseases 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
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- Drying Of Solid Materials (AREA)
Abstract
The invention relates to a microwave/hot air collaborative drying method of a paste-like coating, which belongs to the technical field of microwave heating application. the method comprises the following steps of: respectively adjusting microwave power and hot air volume for a coating with water content of 75-90 wt% in a preheating drying stage, a constant speed drying stage and a decelerating drying stage according to water evaporation rate and water diffusion rate in the coating; and fast and deeply drying the coating at a lower temperature. Compared with other drying methods, the microwave-hot air collaborative low temperature fast and deep drying method of the paste-like coating, which is provided by the invention, has the advantages of energy conservation, environment friendliness and high drying speed; and because the drying temperature is lower, high temperature oxidization of a coating metal substrate can be effectively avoided.
Description
Technical field
The present invention relates to a kind of collaborative dry method of microwave/hot blast of pulpous state coating, belong to the heating using microwave applied technical field.
Background technology
Current coating becomes five big synthetic materials in plastics, adhesive, synthetic rubber, synthetic fibers.Coatings industry belongs to new high-tech industry, and its development level is one of sign of a flourishing level of national chemical industry.The volatile organic matter that coating distributes in air when drying and forming-film has constituted serious threat to human ecological environment.For this reason, corresponding environmental regulation has been formulated based on own characteristic in countries in the world, the discharging of VOC in the restriction coating.The research of coating also is hydrotropismization, high solid differentiation, high performance and functionalization development.And slurry coating material because be easy to disperse, but dress is coated with conveniently, both heating cures; Also but the advantage of air drying is widely used in beyond the water paint; The fields such as surface treatment of also painted at solvent-borne type paint, rubber, chemical fibre, plastics, building and metal material are extensively utilized; But because that slurry coating material complicated component, moisture higher, filming performance require is relatively harsher, brought technical barrier for the rapid draing of filming, seriously restricted the development of coatings industry.
The slurry coating material dress is coated on the workpiece and generally will be heated to certain temperature; Could satisfy the requirement of dry moisture content of coating and surface quality; The mode of conventional heating generally has radiation heating; Three kinds of modes of the compound forced convertion heating of forced convertion heating and radiation heating, traditional heating means all are heated partses or the temperature in the heating furnace are equaled or the dry required temperature of a little higher than coating that its firing rate is slower; Film and be heated inequality easily and crackle occurs, seriously restrict the dry production efficiency of coating.And energy consumption for drying is higher, can not realize serialization production.
In the known drying process, no matter be radiation heating or Convective Heating, the transmission of heat all is from outward appearance to inner essence that needs just can remove moisture through the long period, have reduced drying efficiency; Especially to depth drying, all will workpiece be heated to higher temperature usually, just can be dried to the inside of coating, and the volatilization of chemical reaction or solvent takes place when reaching uniform temperature for some coating easily, this is undoubtedly the dry difficult point of high-moisture percentage coating.
Summary of the invention
The collaborative dry method of microwave/hot blast that the purpose of this invention is to provide a kind of pulpous state coating; Characteristics in conjunction with microwave drying, heated-air drying; The inner heater of microwave on the one hand capable of using is built in the inner vapour pressure gradient that produces of material, and the branch forced conveyance that will wet is to the material surface; Can adopt the auxiliary thermal source of energy-efficient heat pump as drying system on the other hand, the wet branch that will under microwave action, be transported to the material surface utilizes hot blast to carry out highly effective drying.Thereby, carry out speed, energy efficiency and economy that the collaborative drying of microwave-heat pump can effectively improve pulpous state coating drying operation, and cleanliness without any pollution, process is easy to control can realize the serialization production run.
The technical scheme that the present invention adopted is to adopt the continuous microwave/heat pump drying equipment of adjustable power; Preheating and drying stage, constant rate drying period, decreasing drying rate period in coating; Respectively according to the evaporation and the diffusion rate of moisture in the coating; Regulate microwave power and hot blast air quantity, make the high-moisture percentage slurry coating material carry out quick, depth drying below 65 ℃.Concrete steps comprise as follows:
(1) the preheating and drying stage: the uniform dress of slurry coating material is coated on the workpiece, then workpiece is placed in the microwave dryer, microwave output power 4～6kW/m is 50～60wt% up to the coating average moisture content;
(2) constant rate drying period: the power of adjustment microwave dryer is 10～15kW/m, and surface of the work blows 60～65 ℃ of temperature, speed is 1.0～2.5m
3The hot blast of/s is 15～20wt% up to the coating average moisture content;
(3) decreasing drying rate period: the power of adjustment microwave dryer is 3～5kW/m, and surface of the work blows 60～65 ℃ of temperature, speed is 0.2～0.8m
3The hot blast of/s, up to the coating average moisture content less than 1wt%.
Said coating is anticorrosion, resistant to elevated temperatures water paint.
The moisture content of said slurry coating material is 75～90wt%.
The thickness of said dress coating is 1～6mm, keeps the paint thickness uniformity.
Said microwave frequency is 2450MHz.
Said step (1)～(3) are provided with extractor fan, are convenient to vent water vapor, prevent that the dewfall phenomenon from producing, and the exhausting amount is controlled at 1000～1500m
3/ h.
Microwave dryer of the present invention can be processed the tunnel type continuous microwave-heat pump drying equipment of a plurality of microwave equipment series connection; According to certain speed dress being coated with workpiece is transported in microwave-heat pump drying equipment; The travelling speed and the drying time of workpiece are confirmed in variation through the monitoring moisture content, can realize the drying process of serialization.
Technological principle of the present invention is to adopt microwave drying, does not need heat conduction from outward appearance to inner essence, but comes directly to carry out drying through microwave in the energy dissipation of material internal moisture, can remove moisture timely and effectively; The dielectric constant of water is very high, and room temperature condition is issued to 78, belongs to strong suction ripple material; Utilize the microwave selective heating, need not whole work-piece is heated, only the moisture in the coating is heated; Thereby realize dry the saving energy and reduce the cost of coating; But for the single microwave drying of high-moisture material, its energy consumption is higher.And heat pump can reclaim the energy in the hot humid air effectively, and energy-saving benefit is (electric weight of every consumption 1kWh can provide the heat of 3～4kWh) significantly, and can be except that the part steam in the humid air that reduces phlegm and internal heat.Thereby the application of heat pump can make the energy utilization efficiency of traditional drying equipment increase substantially.But the inner rate of drying with the top layer of material is inconsistent.In the intermediary and later stages of drying, the drying though the skin of material has become, material inside still needs further dry, and resistance that its wet branch outwards transmits is very big, causes the wet reduction significantly that divides evaporation capacity, and extend arid cycle, and energy consumption increases.In conjunction with the characteristics of microwave drying, heat pump drying, the inner heater of microwave on the one hand capable of using is built in the inner vapour pressure gradient that produces of material, and the branch forced conveyance that will wet is to the material surface; Can adopt the auxiliary thermal source of energy-efficient heat pump as drying system on the other hand, the wet branch that will under microwave action, be transported to the material surface utilizes hot blast to carry out highly effective drying.
The present invention has following advantage and good effect:
(1), under suitable exhausting amount; Regulate line speed and microwave power; Can with moisture content up to below 90% the moisture drying to 1% and the temperature of workpiece lower, can avoid problems such as the oxidation of substrate is impaired, really realized low temperature, the quick-drying effect of the degree of depth;
(2), through at feed arrangement configuration moisture teller, can regulate transport tape speed and microwave power automatically to the coating of different moisture content, compare with existing drying mode, process is more easy to control, energy-saving effect is more remarkable;
(3), in microwave cavity, set up monitoring device, the superficial appearance that monitoring is in real time filmed also can feed back on display screen, is convenient to prevent the emergency situations such as crackle, " skinning ", material carbonization of dried coating film process;
(4), this patent utilizes the collaborative dry moisture in the coating that just optionally heats of microwave/hot blast; Heated parts not; Can effectively prevent situations such as high-temperature oxydation or the workpiece of coating substrate be impaired, and baking temperature is lower, avoids VOC, CO in the coating effectively
2Etc. the generation in public hazards source, real having accomplished saved energy and reduce the cost, cleaner production.
The specific embodiment
Below in conjunction with embodiment the present invention is done to further describe, but the invention is not restricted to the following stated scope.
Embodiment 1: the collaborative dry method concrete steps of the microwave/hot blast of present embodiment pulpous state coating comprise as follows:
(1) the preheating and drying stage: the uniform dress of the fire-resistant slurry coating material of magnesia (moisture content is 83wt%) is coated on the workpiece; The thickness of dress coating is 5mm; Keep the paint thickness uniformity, then workpiece is placed in the microwave dryer microwave output power 5kW/m; Microwave frequency is 2450MHz, is 50wt% up to the coating average moisture content;
(2) constant rate drying period: the power of adjustment microwave dryer is 12kW/m, and surface of the work blows 65 ℃ of temperature, speed is 1.0m
3The hot blast of/s is 20wt% up to the coating average moisture content;
(3) decreasing drying rate period: the power of adjustment microwave dryer is 3kW/m, and surface of the work blows 65 ℃ of temperature, speed is 0.2m
3The hot blast of/s, the coating moisture content on the discharging opening workpiece are that 0.74wt% and smooth surface do not have obvious crackle, and each item performance indications of filming all are higher than conventional drying.Through calculating, microwave drying coating dehydrating amount is 0.41kg/kWh.
Said step (1)～(3) are provided with extractor fan, are convenient to vent water vapor, prevent that the dewfall phenomenon from producing, and the exhausting amount is controlled at 1247m
3/ h.
Embodiment 2: the collaborative dry method concrete steps of the microwave/hot blast of present embodiment pulpous state coating comprise as follows:
(1) the preheating and drying stage: the uniform dress of the anticorrosion slurry coating material of super fine zinc oxide (moisture content is 90wt%) is coated in the Q235-A surface of the work; The thickness of dress coating is 1mm; Keep the paint thickness uniformity, then workpiece is placed in the microwave dryer microwave output power 4kW/m; Microwave frequency is 2450MHz, is 55wt% up to the coating average moisture content;
(2) constant rate drying period: the power of adjustment microwave dryer is 15kW/m, and surface of the work blows 60 ℃ of temperature, speed is 2.0m
3The hot blast of/s is 15wt% up to the coating average moisture content;
(3) decreasing drying rate period: the power of adjustment microwave dryer is 4kW/m, and surface of the work blows 60 ℃ of temperature, speed is 0.6m
3The hot blast of/s is that 0.65wt% and smooth surface do not have obvious crackle up to the coating average moisture content, and each item performance indications of filming all are higher than conventional drying.Through calculating, microwave drying coating dehydrating amount is 0.32kg/kWh.
Said step (1)～(3) are provided with extractor fan, are convenient to vent water vapor, prevent that the dewfall phenomenon from producing, and the exhausting amount is controlled at 1500m
3/ h.
Embodiment 3: the collaborative dry method concrete steps of the microwave/hot blast of present embodiment pulpous state coating comprise as follows:
(1) the preheating and drying stage: the uniform dress of the high temperature resistant slurry coating material of phosphate base (moisture content is 75wt%) is coated on the workpiece; The thickness of dress coating is 6mm; Keep the paint thickness uniformity, then workpiece is placed in the microwave dryer microwave output power 6kW/m; Microwave frequency is 2450MHz, is 60wt% up to the coating average moisture content;
(2) constant rate drying period: the power of adjustment microwave dryer is 10kW/m, and surface of the work blows 63 ℃ of temperature, speed is 2.5m
3The hot blast of/s is 18wt% up to the coating average moisture content;
(3) decreasing drying rate period: the power of adjustment microwave dryer is 5kW/m, and surface of the work blows 62 ℃ of temperature, speed is 0.8m
3The hot blast of/s, the coating moisture content on the discharging opening workpiece are that 0.44wt% and smooth surface do not have obvious crackle, and each item performance indications of filming all are higher than conventional drying.Through calculating, microwave drying coating dehydrating amount is 0.46kg/kWh.
Said step (1)～(3) are provided with extractor fan, are convenient to vent water vapor, prevent that the dewfall phenomenon from producing, and the exhausting amount is controlled at 1000m
3/ h.
Claims (6)
1. microwave/the hot blast of a pulpous state coating is worked in coordination with dry method, it is characterized in that concrete steps comprise as follows:
(1) the preheating and drying stage: the uniform dress of slurry coating material is coated on the workpiece, then workpiece is placed the microwave equipment inner drying, microwave output power 4～6kW/m is 50～60wt% up to the coating average moisture content;
(2) constant rate drying period: the power of adjustment microwave dryer is 10～15kW/m, and surface of the work blows 60～65 ℃ of temperature, speed is 1.0～2.5m
3The hot blast of/s is 15～20wt% up to the coating average moisture content;
(3) decreasing drying rate period: the power of adjustment microwave dryer is 3～5kW/m, and surface of the work blows 60～65 ℃ of temperature, speed is 0.2～0.8m
3The hot blast of/s, up to the coating average moisture content less than 1wt%.
2. the collaborative dry method of the microwave/hot blast of pulpous state coating according to claim 1, it is characterized in that: said coating is anticorrosion, resistant to elevated temperatures water paint.
3. the collaborative dry method of the microwave/hot blast of pulpous state coating according to claim 1 and 2, it is characterized in that: the moisture content of said slurry coating material is 75～90wt%.
4. the collaborative dry method of the microwave/hot blast of pulpous state coating according to claim 1, it is characterized in that: the thickness of said dress coating is 1～6mm, keeps the paint thickness uniformity.
5. the collaborative dry method of the microwave/hot blast of pulpous state coating according to claim 1, it is characterized in that: said microwave frequency is 2450MHz.
6. the collaborative dry method of the microwave/hot blast of pulpous state coating according to claim 1, it is characterized in that: said step (1)～(3) are provided with extractor fan, and the exhausting amount is controlled at 1000～1500m
3/ h.
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| CN201210095604.XA CN102615030B (en) | 2012-04-01 | 2012-04-01 | Microwave/hot air collaborative drying method of paste-like coating |
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| CN201210095604.XA CN102615030B (en) | 2012-04-01 | 2012-04-01 | Microwave/hot air collaborative drying method of paste-like coating |
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| CN102615030B CN102615030B (en) | 2014-09-03 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105737527A (en) * | 2015-12-25 | 2016-07-06 | 河南勃达微波装备股份有限公司 | Pyrophyllite drying method |
| CN107192218A (en) * | 2017-05-31 | 2017-09-22 | 镇江虎瑞生物科技有限公司 | The furnace drying method that a kind of microwave can be combined with air |
| CN107552351A (en) * | 2017-09-08 | 2018-01-09 | 浙江省林业科学研究院 | A kind of aqueous woodware paint drying equipment and its drying means |
| CN109395996A (en) * | 2018-12-07 | 2019-03-01 | 九牧厨卫股份有限公司 | A kind of water paint drying means |
| CN110495584A (en) * | 2019-09-25 | 2019-11-26 | 中国热带农业科学院农产品加工研究所 | A kind of method that serialization prepares mango fruit cake |
| CN113558166A (en) * | 2020-04-28 | 2021-10-29 | 中国农业机械化科学研究院 | Microwave-assisted drying method for agricultural products |
| WO2022188273A1 (en) * | 2021-03-09 | 2022-09-15 | 四川大学 | Microwave-hot air coupled drying process for water-based synthetic leather |
| CN115414790A (en) * | 2022-08-26 | 2022-12-02 | 安徽普朗膜技术有限公司 | Method for preparing dry-wet reversible organic ultra/micro-filtration membrane by microwave drying technology |
| CN115569824A (en) * | 2021-06-21 | 2023-01-06 | 四川大学 | Microwave drying device for leather coating |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105737527A (en) * | 2015-12-25 | 2016-07-06 | 河南勃达微波装备股份有限公司 | Pyrophyllite drying method |
| CN105737527B (en) * | 2015-12-25 | 2018-11-09 | 河南勃达微波装备股份有限公司 | A kind of pyrophillite drying means |
| CN107192218A (en) * | 2017-05-31 | 2017-09-22 | 镇江虎瑞生物科技有限公司 | The furnace drying method that a kind of microwave can be combined with air |
| CN107552351A (en) * | 2017-09-08 | 2018-01-09 | 浙江省林业科学研究院 | A kind of aqueous woodware paint drying equipment and its drying means |
| CN109395996A (en) * | 2018-12-07 | 2019-03-01 | 九牧厨卫股份有限公司 | A kind of water paint drying means |
| CN110495584A (en) * | 2019-09-25 | 2019-11-26 | 中国热带农业科学院农产品加工研究所 | A kind of method that serialization prepares mango fruit cake |
| CN113558166A (en) * | 2020-04-28 | 2021-10-29 | 中国农业机械化科学研究院 | Microwave-assisted drying method for agricultural products |
| WO2022188273A1 (en) * | 2021-03-09 | 2022-09-15 | 四川大学 | Microwave-hot air coupled drying process for water-based synthetic leather |
| CN115569824A (en) * | 2021-06-21 | 2023-01-06 | 四川大学 | Microwave drying device for leather coating |
| CN115414790A (en) * | 2022-08-26 | 2022-12-02 | 安徽普朗膜技术有限公司 | Method for preparing dry-wet reversible organic ultra/micro-filtration membrane by microwave drying technology |
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| Publication number | Publication date |
|---|---|
| CN102615030B (en) | 2014-09-03 |
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