CN105149191A - Infrared and microwave coupling drying method of water-based paint - Google Patents
Infrared and microwave coupling drying method of water-based paint Download PDFInfo
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- CN105149191A CN105149191A CN201510475219.1A CN201510475219A CN105149191A CN 105149191 A CN105149191 A CN 105149191A CN 201510475219 A CN201510475219 A CN 201510475219A CN 105149191 A CN105149191 A CN 105149191A
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Abstract
The invention discloses an infrared and microwave coupling drying method of water-based paint. Infrared drying and microwave drying are alternately carried out. According to infrared drying, the wavelength is controlled to be longer than 5.6 micrometers, power is 500 W-2,000 W, the drying temperature is 30-100 DEG C, and the drying time is 0.5-60 min. According to microwave drying, the microwave frequency is 915 MHz or 2,450 MHz, power is 300 W-1,500 W, the drying temperature is 30-100 DEG C, and time is 0.5-30 min. According to the infrared and microwave coupling drying method of the water-based paint, water in a wet coating in the water-based wood paint is rapidly removed from the outer surface to the inner surface and from interior to exterior, water which is finally left in a paint film and is hard to extract in a traditional coating drying technology is extracted out, the hidden damage to wood products from left water is eliminated, and the hardness of the film is rapidly increased. According to the infrared and microwave coupling drying method, the water resistance and stain resistance of the film can be improved, and meanwhile the time cost for furniture construction, drying and packing to the water-based wood paint is reduced.
Description
Technical field
The present invention relates to paint spraying field, be specifically related to a kind of water paint infrared microwave coupling drying means.
Background technology
Water paint is the coating using water to replace organic solvent as decentralized medium, has the advantage of safety and environmental protection, is the important directions of world's paint development.Because the evaporation rate of water is slow, the latent heat of vaporization is large, makes existing water paint rate of drying slow, can not meet product painting line and produce fast and the requirement of applying, and seriously hinders water paint particularly the applying of aqueous industrial coating.The dry run of water paint mainly comprises the evaporation of moisture and the physics fusion of polyalcohol emulsion particle and chemical crosslinking etc., and wherein the evaporation of moisture is crucial.People pay much attention to coating and coating quality for a long time, to the dry technology of coating, especially enough attention is not had to the dry technology of water paint, the dry technology of existing water paint is only limitted to natural drying, heated-air drying and a small amount of infra-red drying, it is slow to there is programming rate in these dry technologies, thermograde is obvious, it is slow that paint film does solid work speed, cause water-based hardness of film growth rate slow, the moisture that film remains can reduce the resistance to water of film, alcohol resistance and stain resistance etc., but also easily introduces the decorate properties that dust reduces film; In addition, infra-red drying technology is not suitable for dry thicker water-based film, because film is thicker, the thermograde existed in film and the gradation of moisture more obvious, the moisture remained in film is more, will be clear that residual moisture infra-red drying technology need extend drying time, increases energy consumption.Therefore, use the construction of infra-red drying technology water-borne wood coating to need to adopt the construction method of " scumbling multiple tracks ", add number of times and the cost of construction; Obviously, existing dry technology can not solve the slow difficult problem of the rate of drying of water paint.
Conventional drying process comprises heated-air drying and infra-red drying is that external heat is dry, and after material Surface absorption heat, through heat transfer, heat leak is to internal batch, and heat up drying immediately.Microwave drying utilizes electromagnetic wave to be a kind of drying mode of heater as heating source, dried material itself, is the method for a kind of inside heating, and microwave enters material and after being absorbed, its energy becomes heat energy in material dielectric internal conversion.Therefore, microwave drying has that rate of drying is large, energy-conservation, production efficiency is high, uniform drying, easily realize Automated condtrol and the advantage such as to improve the quality of products, and microwave drying is widely used in the drying of food and medicine; But also do not see have microwave drying technology to be applied in the dry run of water paint at present, mainly existing microwave drying technology easily makes dried object qualitative change shape, loses original performance, as microwave drying easily makes wooden or plastics part distortion.
Summary of the invention
The present invention is directed to existing water paint dry technology, to there is programming rate slow, thermograde is obvious, it is slow that paint film does solid work speed, cause water-based hardness of film growth rate slow, the moisture that film remains can reduce resistance to water, the defect such as alcohol resistance and stain resistance of film, there is provided a kind of drying time short, film performance reaches the water paint infrared microwave coupling drying means of solvent-borne type film performance.
For achieving the above object, technical scheme of the present invention is as follows:
A kind of water paint microwave-infrared coupling drying means, hocketed by infra-red drying and microwave drying, control the wavelength of infra-red drying more than 5.6 μm, power is 500W-2000W, and baking temperature is 30-100 DEG C, and drying time is 0.5-60min; The microwave frequency of microwave drying is 915 or 2450MHz; Power is 300W-1500W, and baking temperature is 30-100 DEG C, and the time is 0.5-30min.
For realizing the object of the invention further, preferably, the number of times that described infra-red drying and microwave drying hocket is 2-7 time.
Preferably, the combination that described infra-red drying and microwave drying hocket is: infra-red drying-microwave drying, infra-red drying-microwave drying-infra-red drying, infra-red drying-microwave drying-infra-red drying-microwave drying or infra-red drying-microwave drying-infra-red drying-microwave drying-infra-red drying.
Preferably, the combination that described infra-red drying and microwave drying hocket is: microwave drying-infra-red drying, microwave drying-infra-red drying-microwave drying, microwave drying-infra-red drying-microwave drying-infra-red drying or microwave drying-infra-red drying-microwave drying-infra-red drying-microwave drying.
Preferably, the time of described infra-red drying is 2-20min.
Preferably, the time of described microwave drying is 1-10min.
Inventor finds through research, and infrared ray is good to the penetrability of object, and infra-red radiation is heated externally to film inside by film, and the heat time is short, and homogeneous heating, moisture evaporation are smooth, do not produce the defects such as pin hole, bubble, speckle.And microwave drying is heated from film inside, easily eliminate thermograde and the gradation of moisture of wet coating, be conducive to homogeneous heating.Adopt infra-red drying and microwave drying to hocket for the drying of water-borne wood coating, infra-red drying can be made full use of by film outside gradually to the inner dry run of film, the free moisture of 60-80% in energy rapid evaporation wet coating; And microwave drying can ensure heat from film to external diffusion, the moisture remaining in film inside is spread to coating surface, fast removes moisture, particularly Bound moisture residual in film.Therefore, infrared microwave coupling dry technology, give full play to respective advantage, overcome shortcoming each other, than being used alone infra-red drying or microwave drying can save a large amount of energy consumptions, ensure that film has excellent properties and also can not destroy wooden and plastics part, particularly such combination can overcome the problem that microwave drying easily makes dried object qualitative change shape, the film obtained.
Compared with prior art, tool of the present invention has the following advantages:
1) the present invention adopts infrared microwave coupling dry technology, realize moisture in the wet coating of water-borne wood coating from table to quick removal inner and from inside to outside, in work progress by be difficult in conventional drying techniques extract final residual in paint film 10% ~ 15% water propose in the lump, eliminate residual moisture to damage the stealth of wood-based product, and set up hardness fast.
2) the present invention greatly reduces the time cost of furniture spray paint, the bone dry time of water-borne wood coating individual layer can be reduced to normal temperature self-drying 40% in complete.
3) the present invention to be coupled dry technology by infrared microwave, strictly controls drying time, baking temperature etc., overcomes the defect that prior art microwave drying easily makes dried object qualitative change shape.
4) the present invention to be coupled dry technology by infrared microwave, overcoming existing water paint dry technology, to there is programming rate slow, thermograde is obvious, it is slow that paint film does solid work speed, cause water-based hardness of film growth rate slow, the moisture that film remains can reduce the defects such as the resistance to water of film, alcohol resistance and stain resistance.
5) compare with independent infra-red drying with traditional heated air drying, the present invention has better parching property and dust-proof effect, hardness of film growth rate can be improved, improve resistance to water and the stain resistance of film, reduce water-borne wood coating to furniture construction, the time cost being dried to packaging simultaneously.
Specific embodiment
For understanding the present invention better, below in conjunction with embodiment, the present invention is further illustrated, but embodiment does not form limiting the scope of the invention.
The drying process of embodiment below: after the workpiece after polishing carries out spraying application, workpiece is fixed on drying line, move with drying line, through infrared microwave coupling arid region, the concrete erection sequence in arid region and chief engineer's hop count can be the one in following any combination: microwave-infrared, infrared-microwave, microwave-infrared-microwave, infrared-microwave-infrared, microwave-infrared-microwave-infrared, infrared-microwave-infrared-microwave, microwave-infrared-microwave-infrared-microwave etc.Workpiece is behind arid region, coating decoration personnel can select again spray-applied primer according to Workpiece coating effect and construction requirement or directly enter the coating decoration of finish paint, then workpiece with drying line again through infrared microwave coupling arid region, until obtain desirable painting effect.Concrete drying process describes sees embodiment 1,2; Other embodiment techniques are see embodiment 1,2 and this place's explanation.
Embodiment 1
To spraying one aqueous one-component priming paint with together with the furniture of aqueous one-component finish paint carry out drying, dry run is as table 1:
Table 1
The drying process of table 1: spray the workpiece after one priming paint, first through infra-red drying, baking temperature is 30 DEG C, and drying time is 0.5 minute; Then through microwave drying, baking temperature is 50 DEG C, and drying is 5 minutes.Workpiece carries out the construction of one finish paint again, through infra-red drying (40 DEG C, 3 minutes) after construction; Then through microwave drying (50 DEG C, 3 minutes), dry through above-mentioned infrared microwave coupling, the test of its film performance as listed in table 2.In table 2, independent infra-red drying is identical with embodiment 1 (table 1) with the condition of independent microwave drying.The drying process of each embodiment is below all see table 1.
Table 2
As can be seen from Table 2, the hardness of film obtained after infrared microwave coupling drying rises to HB by the B of infra-red drying; In water-resistance property of coating, dry heat resistance and alcohol resistance, with solvent based coating high performance level.The infrared microwave coupling dry technology of the present embodiment is compared than independent infra-red drying or microwave drying also obvious advantage, and film resistance to water, dry heat resistance and alcohol resistance are promoted to 5 grades, 4 grades, 4 grades by 4 grades, 3 grades, 3 grades.And the film of gained of the present invention overcomes those skilled in the art completely and generally believes that microwave drying easily makes the prejudice of workpiece deformation (comprising film); Meanwhile, the present embodiment also overcomes the problem of prior art water-based dried coating film time length, and the present embodiment overall drytime only has 11.5min.The present embodiment can obtain above-mentioned drying effect may come from microwave-infrared coupling dry technology, give full play to infrared and microwave drying advantage separately and respective deficiency can be overcome, wherein infra-red drying makes the most of free moisture in water paint to evaporate rapidly, microwave drying then easily can extract in paint film the Bound moisture being difficult to overflow, simultaneously due to the swing in high frequency of hydrone under microwave action, the emulsion particle as the water-based emulsion of main film forming substance is made to obtain better mutually merging on microcosmic, the helping film-formation result more remarkable and can escape from paint film faster of coalescents, thus cause the obvious hardness of paint film to set up speed quickening, smooth density rises, surface chemical resistance performance improves.Table 2 also illustrates microwave drying overlong time, also makes workpiece that slight distortion occurs, can not meet coating specification.
Embodiment 2
To brushing one aqueous one-component priming paint with together with the furniture of aqueous one-component finish paint carry out drying, dry run is as table 3.The drying process of table 3 is see table 1.
Table 3
Table 4
| Test event | Microwave-infrared coupling is dry | Infra-red drying | Microwave drying |
| Appearance of film | Without exception | Without exception | Without exception |
| Drying time, min | 7min | 7min | 7min |
| Pencil hardness | HB | B | B |
| Gloss (20 °, %) | 47 | 41 | 35 |
| Resistance to water, level | 5 | 4 | 4 |
| Dry heat resistance, level | 5 | 4 | 4 |
| Alcohol resistance, level | 4 | 3 | 3 |
As can be seen from Table 4, workpiece is through the construction of priming paint and finish paint, through infrared-microwave-infrared three sections of coupling dry technologies, its hardness of film rises to HB by the B of independent infra-red drying or microwave drying, and water-resistance property of coating, dry heat resistance and alcohol resistance are then corresponding is upgraded to 5 grades, 5 grades and 4 grades indescribably by 4 grades, 4 grades and 3 fractions.This further illustrates infrared-microwave-infrared coupling dry technology, can play respective advantage, can significantly improve hardness of film, the smooth densification of dry coating film of acquisition, and chemical resistance performance is excellent.
Embodiment 3
To spraying twice aqueous double-component priming paint with together with the furniture of aqueous double-component finish paint carry out drying, dry run is as table 5:
Table 5
After dry, paint film property test case is listed by table 6:
Table 6
| Test event | Microwave-infrared coupling is dry | Infra-red drying | Microwave drying |
| Appearance of film | Without exception | Without exception | Without exception |
| Drying time, min | 11.5 | 11.5 | 11.5 |
| Pencil hardness | HB | B | B |
| Gloss (20 °, %) | 32° | 29° | 25 |
| Resistance to water, level | 5 | 5 | 4 |
| Dry heat resistance, level | 4 | 3 | 3 |
| Alcohol resistance, level | 4 | 3 | 3 |
Embodiment 4
To spraying twice aqueous one-component priming paint with together with the furniture of aqueous one-component finish paint carry out drying, dry run is as table 7:
Table 7
After dry, paint film property test case is listed by table 8:
Table 8
| Test event | Microwave-infrared coupling is dry | Infra-red drying | Microwave drying |
| Appearance of film | Without exception | Without exception | Workpiece deformation |
| Drying time, min | 39 | 39 | 39 |
| Pencil hardness | HB | B | B |
| Gloss (20 °, %) | 47 | 41 | 40 |
| Resistance to water, level | 5 | 4 | 4 |
| Dry heat resistance, level | 5 | 4 | 3 |
| Alcohol resistance, level | 4 | 3 | 3 |
Embodiment 5
To spraying twice aqueous double-component priming paint with together with the furniture of aqueous double-component finish paint carry out drying, dry run is as table 9:
Table 9
After dry, paint film property test case is listed by table 10:
Table 10
| Test event | Microwave-infrared coupling is dry | Infra-red drying | Microwave drying |
| Appearance of film | Without exception | Without exception | Workpiece deformation |
| Drying time, min | 143.5 | 143.5 | 143.5 |
| Pencil hardness | H | F | B |
| Gloss (20 °, %) | 47 | 41 | 40 |
| Resistance to water, level | 5 | 4 | 4 |
| Dry heat resistance, level | 5 | 4 | 4 |
| Alcohol resistance, level | 4 | 3 | 3 |
Embodiment 6
To spraying twice aqueous double-component priming paint with together with the furniture of aqueous double-component finish paint carry out drying, dry run is as table 11:
Table 11
After dry, paint film property test case is listed by table 12:
Table 12
| Test event | Microwave-infrared coupling is dry | Infra-red drying | Microwave drying |
| Appearance of film | Without exception | Without exception | Workpiece deformation |
| Drying time, min | 186 | 600 | 143.5 |
| Pencil hardness | H | F | F |
| Gloss (20 °, %) | 47 | 41 | 40 |
| Resistance to water, level | 5 | 4 | 4 |
| Dry heat resistance, level | 5 | 4 | 4 |
| Alcohol resistance, level | 4 | 3 | 3 |
Embodiment 7
To spraying three road aqueous double-component priming paint with together with the furniture of aqueous double-component finish paint carry out drying, dry run is as table 13:
Table 13
After dry, paint film property test case is listed by table 14:
Table 14
| Test event | Microwave-infrared coupling is dry | Infra-red drying | Microwave drying |
| Appearance of film | Without exception | Without exception | Workpiece deformation |
| Drying time, min | 262 | 780 | 143.5 |
| Pencil hardness | H | HB | F |
| Gloss (20 °, %) | 47° | 41° | 40 |
| Resistance to water, level | 5 | 4 | 4 |
| Dry heat resistance, level | 5 | 4 | 4 |
| Alcohol resistance, level | 4 | 3 | 3 |
Embodiment 8
To spraying three road aqueous double-component priming paint with together with the furniture of aqueous double-component finish paint carry out drying, dry run is as table 15:
Table 15
After dry, paint film property test case is listed by table 16:
Table 16
| Test event | Microwave-infrared coupling is dry | Infra-red drying | Microwave drying |
| Appearance of film | Without exception | Without exception | Workpiece deformation |
| Drying time, min | 316 | 316 | 316 |
| Pencil hardness | H | F | F |
| Gloss (20 °, %) | 47 | 41 | 40 |
| Resistance to water, level | 5 | 4 | 4 |
| Dry heat resistance, level | 5 | 4 | 4 |
| Alcohol resistance, level | 4 | 3 | 3 |
Embodiment 9
To spraying twice aqueous one-component priming paint with together with the furniture of aqueous one-component finish paint carry out drying, dry run is as table 17:
Table 17
After dry, paint film property test case is listed by table 18:
Table 18
| Test event | Microwave-infrared coupling is dry | Infra-red drying | Microwave drying |
| Appearance of film | Without exception | Without exception | Workpiece deformation |
| Drying time, min | 30 | 30 | 30 |
| Pencil hardness | HB | B | B |
| Gloss (20 °, %) | 46 | 41 | 40 |
| Resistance to water, level | 5 | 4 | 4 |
| Dry heat resistance, level | 5 | 4 | 4 |
| Alcohol resistance, level | 4 | 3 | 3 |
Embodiment 10
To spraying twice aqueous double-component priming paint with together with the furniture of aqueous double-component finish paint carry out drying, dry run is as table 19:
Table 19
After dry, paint film property test case is listed by table 20:
Table 20
| Test event | Microwave-infrared coupling is dry | Infra-red drying | Microwave drying |
| Appearance of film | Without exception | Without exception | Workpiece deformation |
| Drying time, min | 45 | 45 | 45 |
| Pencil hardness | H | F | F |
| Gloss (20 °, %) | 92 | 88 | 86 |
| Resistance to water, level | 5 | 4 | 4 |
| Dry heat resistance, level | 5 | 4 | 4 |
| Alcohol resistance, level | 5 | 4 | 3 |
Better can implement the present invention as mentioned above.
Claims (6)
1. a water paint microwave-infrared coupling drying means, is characterized in that, hocketed by infra-red drying and microwave drying, control the wavelength of infra-red drying more than 5.6 μm, power is 500W-2000W, and baking temperature is 30-100 DEG C, and drying time is 0.5-60min; The microwave frequency of microwave drying is 915 or 2450MHz; Power is 300W-1500W, and baking temperature is 30-100 DEG C, and the time is 0.5-30min.
2. water paint microwave-infrared coupling drying means according to claim 1, it is characterized in that, the number of times that described infra-red drying and microwave drying hocket is 2-7 time.
3. water paint microwave-infrared coupling drying means according to claim 1 and 2, it is characterized in that, the combination that described infra-red drying and microwave drying hocket is: infra-red drying-microwave drying, infra-red drying-microwave drying-infra-red drying, infra-red drying-microwave drying-infra-red drying-microwave drying or infra-red drying-microwave drying-infra-red drying-microwave drying-infra-red drying.
4. water paint microwave-infrared coupling drying means according to claim 1 and 2, it is characterized in that, the combination that described infra-red drying and microwave drying hocket is: microwave drying-infra-red drying, microwave drying-infra-red drying-microwave drying, microwave drying-infra-red drying-microwave drying-infra-red drying or microwave drying-infra-red drying-microwave drying-infra-red drying-microwave drying.
5. water paint microwave-infrared coupling drying means according to claim 1, it is characterized in that, the time of described infra-red drying is 2-20min.
6. water paint microwave-infrared coupling drying means according to claim 1, it is characterized in that, the time of described microwave drying is 1-10min.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN109676726A (en) * | 2018-12-25 | 2019-04-26 | 中南林业科技大学 | A kind of method of modifying of bamboo and wood modifying agent, preparation method and fast-growing bamboo and wood |
| CN110339984A (en) * | 2019-06-21 | 2019-10-18 | 广州市五次枋实业有限公司 | A kind of aqueous lacquer wood production line of far infrared microwave coupling |
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| CN104438008A (en) * | 2014-11-11 | 2015-03-25 | 泰安鲁普耐特塑料有限公司 | Dip coating treatment method for chemical fiber ropes |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104438008A (en) * | 2014-11-11 | 2015-03-25 | 泰安鲁普耐特塑料有限公司 | Dip coating treatment method for chemical fiber ropes |
Non-Patent Citations (1)
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN109676726A (en) * | 2018-12-25 | 2019-04-26 | 中南林业科技大学 | A kind of method of modifying of bamboo and wood modifying agent, preparation method and fast-growing bamboo and wood |
| CN110339984A (en) * | 2019-06-21 | 2019-10-18 | 广州市五次枋实业有限公司 | A kind of aqueous lacquer wood production line of far infrared microwave coupling |
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