CN103805026A - Medium-density fiberboard - Google Patents
Medium-density fiberboard Download PDFInfo
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- CN103805026A CN103805026A CN201410025357.5A CN201410025357A CN103805026A CN 103805026 A CN103805026 A CN 103805026A CN 201410025357 A CN201410025357 A CN 201410025357A CN 103805026 A CN103805026 A CN 103805026A
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Abstract
The invention relates to a medium-density fiberboard, which comprises a medium-density fiberboard body, wherein an edge-sealing coating is arranged on the lateral surface of the board body; a thermosetting coating is arranged on the edge-sealing coating and the surface of the board body; the edge-sealing coating is obtained by electrostatically spray-coating and curing an edge-sealing powder coating on the lateral surface of the board body; the thermosetting coating is obtained by electrostatically spray-coating and curing a low-temperature curing powder coating on the edge-sealing coating and the surface of the board body. According to the medium-density fiberboard, a good edge sealing effect can be achieved, and cracks in the lateral surface of the medium-density fiberboard are effectively avoided; an electrostatic spray-coating mode is adopted, so that an edge-sealing process is simple, convenient and suitable for the edge sealing of substrate workpieces in various shapes.
Description
Technical field
The present invention relates to a kind of sheet material, be specifically related to a kind of medium density fiberboard.
Background technology
Thermosetting powder coating(s) is because it is containing organic solvent, and the feature of environmental protection is good, and utilization ratio is high, and the advantage such as storage, convenient transportation is widely used in each field.Because thermo-sensitivity base material (as wood, fiberboard, plastics, cement plate etc.) has thermo-sensitivity, therefore conventional thermosetting powder coating(s) cannot directly apply in thermo-sensitivity logging.Along with modern development in science and technology, existing multiple thermo-sensitivity base material low temperature cured powder coating at present, but in actual production technique, also there is following problems:
Thermo-sensitivity base material is as medium density fiberboard, and after low temperature cured powder coating spraying, in baking-curing process and after solidifying, substrate side there will be the situation of cracking.This generally adopts gummed or mold pressing to obtain because of thermo-sensitivity base material, therefore the density difference at thermo-sensitivity base material different positions place on thickness direction, wherein, on base material, the density of lower surface is larger, and middle portion density is less, take sheet material as example, the density of sheet material middle portion is only on it, 3/4ths of lower surface density, and then cause thermo-sensitivity base material in the time of follow-up baking-curing, because of heat expansion but answer degree difference, also can be fallen to crack by high temperature evaporation because of the moisture of thermo-sensitivity base material inside simultaneously, and along with the continuous evaporation of thermo-sensitivity base material internal moisture, so crackle can spread to its inside from substrate side, have a strong impact on spraying effect, finally cannot meet actual production demand, greatly limit the application of powder coating on thermo-sensitivity base material.
In order to solve the problems of the technologies described above, now more existing correlation techniques are open, the Chinese patent that is CN202685037U as Granted publication number discloses a kind of synthetic plate, comprise mainboard, described mainboard has two relative mainboard faces and is connected to the side between two mainboard faces, wherein, the side of described mainboard is provided with the bead layer being formed by the powder coating of hot melt, on other surfaces of described bead layer and mainboard, is all coated with the coating being formed by powder coating spraying coating process.And the preparation method of a kind of thermo-sensitivity base material edge sealing powder coating is disclosed as the publication number PCT patent that is WO2013/078648A1, its technical scheme is specially: comprise that the side of sealing substrate is in order to avoid from water loss, apply powder coating to substrate surface, then powder coating is cured; This invention also provides the preparation method of another kind of thermo-sensitivity base material edge sealing powder coating, comprise and apply powder coating to substrate surface, heat about 60-90 and melt substrate surface second, surface is there is reach the maximum solidification value of melting powder coating, then maintain the about 120-180 of this solidification value and realize solidifying powder coating second.(its original text is: " The present invention provides a method of powder coating a heat-sensitive item having an edge, which includes sealing the edge against moisture loss from the item, applying powder to a surface of the item, and curing the powder.The present invention also provides another method of powder coating a heat-sensitive item, the method including applying a powder to a surface of the item, heating the surface in a melting stage between about 60 seconds and about 90 seconds sueh that the surface has a surface temperature that reaches a maximum that is above a curing temperature to melt the powder, and heating the surface in a curing stage to maintain the surface temperature at the curing temperature between about 120 seconds and about180 seconds to cure the powder. ").Above technical scheme is all to adopt hot melt powder coating paint substrate side to realize comprising the edge sealing of the thermo-sensitivity base materials such as sheet material, although avoided the generation of side face of plate material crackle, but its edge sealing process complexity, the thermo-sensitivity base material being not suitable for having complicated shape structure carries out edge sealing, the penetrance that liquid applies is simultaneously poor, cannot realize thick painting, intensity and the levelling property of edge sealing coating are all restricted, finally cannot make and obtain high-quality thermo-sensitivity base material edge sealing coating, in addition, it is distinctive " not containing organic solvent that above technical scheme does not more possess powder coating, the feature of environmental protection is good, utilization ratio is high, and store, convenient transportation " etc. advantage.
For another example the Chinese patent that Granted publication number is CN202862329U discloses a kind of flawless synthetic plate, comprise mainboard (1), it is characterized in that: described mainboard (1) has two relative mainboard faces (2) and is connected to the side (3) between two mainboard faces (2), the surface of described flawless synthetic plate has by the coating material solidified bead layer forming of UV spectrum (11), described bead layer (11) is evenly coated on each surface of mainboard (1), the skin of described bead layer (11) is provided with the thermoset layer (12) that low-temperature powder spraying forms, described mainboard (1) middle part is provided with circular hole (4), the internal surface of circular hole (4) has bead layer (11), in bead layer (11), be provided with thermoset layer (12).This technical scheme is mentioned and is adopted the coating material solidified plate surface that is coated in of UV spectrum to realize edge sealing, because the penetrance of UV spectrum is poor, therefore can realize curing edge sealing coating very thin, want to obtain the edge sealing coat-thickness with some strength, must repeatedly apply just and can meet, and edge sealing process is complicated equally, the thermo-sensitivity base material being not suitable for having complicated shape structure carries out edge sealing, the penetrance that liquid applies is simultaneously poor, cannot realize thick painting, intensity and the levelling property of edge sealing coating are all restricted, finally cannot make and obtain high-quality thermo-sensitivity base material edge sealing coating, more do not possess equally powder coating distinctive " not containing organic solvent, the feature of environmental protection is good, utilization ratio is high, and store, convenient transportation " etc. advantage.
Therefore, be necessary to propose a kind of technical scheme and solve the technical problem that above-mentioned thermo-sensitivity base material edge sealing exists.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of medium density fiberboard, realize the good edge sealing effect to medium density fiberboard, effectively avoid medium density fiberboard side to crack, and realize employing electrostatic spraying, edge sealing process is simple and convenient, is applicable to the edge sealing of different shape base material workpiece.
Before introducing technical solution of the present invention, the present invention first introduces the concrete origin of present techniques scheme.The applicant tests the various open improvement project in background technology, find that they are all for fear of the crack problem that adopts existing business-like powder coating spraying to exist, adopt medium density fiberboard is carried out to edge sealing in advance, particularly, as adopt hot melt adhesive to apply edge sealing, or adopt ultra-violet curing uv curing coating to apply edge sealing, although certain procedures solved adopt conventional low temperature cured powder coating spray produce crack problem, but its edge sealing process complexity, the medium density fiberboard being not suitable for having complicated shape structure is carried out edge sealing, the penetrance that liquid applies is simultaneously poor, cannot realize thick painting, intensity and the levelling property of edge sealing coating are all restricted, finally cannot make and obtain high-quality medium density fiberboard edge sealing coating, make the application of powder coating on medium density fiberboard edge sealing be subject to extremely arduous restriction.
Applicant learns by analysis, want powder coating and can carry out edge sealing application in medium density fiberboard, should solve and adopt conventional low temperature cured powder coating to spray the problem that causes medium density fiberboard side to crack, medium density fiberboard is carried out to edge sealing processing in advance, avoid again adopting hot melt adhesive to apply edge sealing or adopt ultra-violet curing uv curing coating to apply the substantive defect that the techniques such as edge sealing exist, just need to develop a kind of powder coating that medium density fiberboard edge sealing is used that is applicable to, and this powder coating must have good fast setting and flow leveling, before the evaporation of medium density fiberboard moisture or a large amount of evaporation, complete whole solidification process, edge sealing coating after film-forming must possess good physical strength simultaneously, can realize like this employing electrostatic spraying, edge sealing process is simple and convenient, be applicable to the edge sealing of different shape base material workpiece, also can specifically select according to actual machine strength demand the thickness of spraying simultaneously, further meet the requirement of mechanical strength of different medium density fiberboard for edge sealing coating.
The expertise of accumulating for many years in powder coating industry based on the applicant and lot of experiments research, finally obtain the application, will specifically introduce technical scheme of the present invention below.
The technical solution used in the present invention is as follows:
A kind of medium density fiberboard, comprises medium density fiberboard plate body, and described plate body side has edge sealing coating, and in described edge sealing coating and described plate body surface is provided with thermosetting coating, wherein,
Described edge sealing coating obtains after adopting and adopt powder coating electrostatic spraying for edge sealing, solidification treatment on plate body side;
Described thermosetting coating obtains after adopting and adopt powder coating electrostatic spraying for low-temperature curing, solidification treatment in described edge sealing coating and on described plate body surface.
Preferably, the curing employing infrared spectra curing mode of described edge sealing coating, the wavelength region of described infrared spectra is 0.75-1000 μ m.
Preferably, the curing employing thermofixation mode of described edge sealing coating, described heat curing temperature scope is 100-200 ℃.
Preferably, the curing employing UV spectrum of described edge sealing coating causes and thermal initiation combined type curing mode, and the wavelength region of described UV spectrum is 0.01-0.4 μ m, and the temperature range of described thermal initiation is 60-150 ℃.
Preferably, described edge sealing comprises the raw material of following portions by weight with powder coating:
Wherein, described epoxy resin is to adopt hypocrystalline or holocrystalline or super esterification technique to prepare, for reducing viscosity and raising curing speed.
Preferably, described solidifying agent is any one or a few mixing of imidazolines, hydrazides class, phenolic solidifying agent, for improving the intensity of described curing cross-linking reaction; Described color stuffing is the mixing of any one or two kinds in titanium nickel class, pucherite class inorganic color stuffing, for reflection with absorb infrared spectra, accelerates the process of described curing cross-linking reaction.
Preferably, described powder coating comprises the raw material of following portions by weight:
Preferably, described UV spectrum initiator is any one or a few the mixing in benzoin derivatives, benzil derivative, dialkoxy methyl phenyl ketone, alpha-hydroxyalkyl benzophenone; Described thermal initiator is any one or a few the mixing in benzoyl peroxide, azo diethyl heptonitrile, azo diethyl butyronitrile; Described color stuffing is transparence, for reflection and absorption UV spectrum.
Preferably, the producer of described UV spectrum adopts mercury lamp and potassium lamp.
Preferably, described auxiliary agent comprises any one or a few of flow agent, rheological agent, viscosity-depression agent, air release agent, defoamer; Described air release agent and/or defoamer adopt the mixing of any one or two kinds in wax powder, polyethers oligomer.
Medium density fiberboard described in the present invention in full refers to that its density range is generally at 0.5-0.8g/cm
3, the sheet material that thickness is 1-40mm.
Principle of work of the present invention and advantage: the present invention obtains edge sealing coating after adopting powder coating electrostatic spraying for edge sealing, solidification treatment on medium density fiberboard plate body side, then after adopting powder coating electrostatic spraying for low-temperature curing, solidification treatment in this edge sealing coating and on plate body surface, obtain thermosetting coating, edge sealing process is simple and convenient, be applicable to the edge sealing of different shape base material workpiece, the thickness that simultaneously also can specifically select according to actual machine strength demand spraying, further meets the requirement of mechanical strength of different medium density fiberboard for edge sealing coating
The present invention further optimally, propose to adopt the thermosetting resin of a certain proportion of epoxy resin as edge sealing powder coating, epoxy resin itself has good curing cross-linked performance, make the edge sealing coating after film-forming possess good physical strength, epoxy resin simultaneously provided by the invention adopts hypocrystalline or holocrystalline or super esterification technique to prepare, the viscosity that can effectively reduce powder coating improves the curing speed of powder coating simultaneously, thereby make powder coating possess good flow leveling and fast setting performance, before the evaporation of medium density fiberboard moisture or a large amount of evaporation, complete whole solidification process, powder coating provided by the invention has been realized the good edge sealing effect to medium density fiberboard, effectively avoid medium density fiberboard side to crack.
The present invention further optimally, proposes to adopt infrared spectra curing mode to realize and solidifies, diffractive due to infrared spectra, and therefore solidification effect is good, can significantly accelerate the process of curing cross-linking reaction.
The present invention further optimally, because the curing system of UV spectrum initiator and unsaturated polyester resin or super esterified polyester resin has good flow leveling and fast setting performance, but simultaneously because UV spectrum exists penetrance poor, can realize curing coating very thin, thereby make the edge sealing coating very thin (being no more than 20mm) finally preparing, want to obtain the edge sealing coat-thickness with some strength, must repeatedly apply the requirement of strength that just can meet edge sealing coating, cause edge sealing process extremely complicated, cannot realize industrialization at all, the embodiment of the present invention is for this technological deficiency, propose to adopt the curing composite curing mode of thermal initiator on the curing basis of UV spectrum initiator simultaneously, make can realize curing coating and reach certain thickness by spraying once, and then meet the requirement of mechanical strength of edge sealing coating, therefore the embodiment of the present invention has realized before the evaporation of medium density fiberboard moisture or a large amount of evaporation, complete whole solidification process, the powder coating that the embodiment of the present invention provides has been realized the good edge sealing effect to medium density fiberboard, effectively avoid medium density fiberboard side to crack.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, the accompanying drawing the following describes is only some embodiment that record in the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Accompanying drawing 1 is the block diagram of preparing of edge sealing powder coating under the specific embodiment of the invention;
Accompanying drawing 2 is structural representations of medium density fiberboard under the specific embodiment of the invention.
Embodiment
The embodiment of the invention discloses a kind of medium density fiberboard, comprise medium density fiberboard plate body, plate body side has edge sealing coating, and in edge sealing coating and plate body surface is provided with thermosetting coating, wherein,
Edge sealing coating obtains after adopting and adopt powder coating electrostatic spraying for edge sealing, solidification treatment on plate body side;
Thermosetting coating obtains after adopting and adopt powder coating electrostatic spraying for low-temperature curing, solidification treatment in edge sealing coating and on plate body surface.
The present invention obtains edge sealing coating after adopting powder coating electrostatic spraying for edge sealing, solidification treatment on medium density fiberboard plate body side, then after adopting powder coating electrostatic spraying for low-temperature curing, solidification treatment in this edge sealing coating and on plate body surface, obtain thermosetting coating, edge sealing process is simple and convenient, be applicable to the edge sealing of different shape base material workpiece, the thickness that simultaneously also can specifically select according to actual machine strength demand spraying, further meets the requirement of mechanical strength of different medium density fiberboard for edge sealing coating
The embodiment of the present invention further optimally, propose to adopt the thermosetting resin of a certain proportion of epoxy resin as edge sealing powder coating, epoxy resin itself has good curing cross-linked performance, make the edge sealing coating after film-forming possess good physical strength, the epoxy resin that the embodiment of the present invention provides simultaneously adopts hypocrystalline or holocrystalline or super esterification technique to prepare, the viscosity that can effectively reduce powder coating improves the curing speed of powder coating simultaneously, thereby make powder coating possess good flow leveling and fast setting performance, before the evaporation of medium density fiberboard moisture or a large amount of evaporation, complete whole solidification process, the powder coating that the embodiment of the present invention provides has been realized the good edge sealing effect to medium density fiberboard, effectively avoid medium density fiberboard side to crack.
The embodiment of the present invention further optimally, proposes to adopt infrared spectra curing mode to realize and solidifies, diffractive due to infrared spectra, and therefore solidification effect is good, can significantly accelerate the process of curing cross-linking reaction.
The embodiment of the present invention further optimally, because the curing system of UV spectrum initiator and unsaturated polyester resin or super esterified polyester resin has good flow leveling and fast setting performance, but simultaneously because UV spectrum exists penetrance poor, can realize curing coating very thin, thereby make the edge sealing coating very thin (being no more than 20mm) finally preparing, want to obtain the edge sealing coat-thickness with some strength, must repeatedly apply the requirement of strength that just can meet edge sealing coating, cause edge sealing process extremely complicated, cannot realize industrialization at all, the embodiment of the present invention is for this technological deficiency, propose to adopt the curing composite curing mode of thermal initiator on the curing basis of UV spectrum initiator simultaneously, make can realize curing coating and reach certain thickness by spraying once, and then meet the requirement of mechanical strength of edge sealing coating, therefore the embodiment of the present invention has realized before the evaporation of medium density fiberboard moisture or a large amount of evaporation, complete whole solidification process, the powder coating that the embodiment of the present invention provides has been realized the good edge sealing effect to medium density fiberboard, effectively avoid medium density fiberboard side to crack.
Embodiment 1:
Shown in Figure 2, a kind of medium density fiberboard, comprise medium density fiberboard plate body 100, plate body side has edge sealing coating 200, in edge sealing coating 200 and plate body 100 surfaces are provided with thermosetting coating 300, wherein, edge sealing coating 200 adopts and on plate body 100 sides, adopts powder coating electrostatic spraying for edge sealing, infrared spectra curing mode to obtain after processing, and the concrete wavelength region of infrared spectra is 100-300 μ m.Natch, in other embodiment, can also select the infrared spectra of other concrete wavelength regions.
In the present embodiment, edge sealing comprises the raw material of following portions by weight with powder coating:
63 parts of epoxy resin, wherein, epoxy resin is to adopt hypocrystalline or holocrystalline or super esterification technique to prepare, for reducing viscosity and raising curing speed, particularly, in the present embodiment, epoxy resin is to adopt holocrystalline technique to prepare;
10 parts, solidifying agent, for producing curing cross-linking reaction with epoxy resin; Preferably, solidifying agent adopts one or more high reactivity solidifying agent to mix and makes, for improving the intensity of curing cross-linking reaction, further preferably, high reactivity solidifying agent is any one or a few mixing of imidazolines, hydrazides class, phenolic solidifying agent, particularly, in the present embodiment, solidifying agent imidazolines high reactivity solidifying agent;
20 parts of color stuffings, preferably, color stuffing is inorganic color stuffing, for improving thermostability and chemical stability, further preferably, inorganic color stuffing is the mixing of any one or two kinds in titanium nickel class, pucherite class inorganic color stuffing, be the infrared spectra of 0.75-1000 μ m for reflecting with absorbing wavelength scope, for accelerating the process of curing cross-linking reaction, particularly, in the present embodiment, color stuffing is titanium nickel class inorganic color stuffing;
7 parts of auxiliary agents; Particularly, in the present embodiment, auxiliary agent comprises 1 part of flow agent, 0.5 part of rheological agent, 0.5 portion of viscosity-depression agent, 3 parts of air release agents and 2 parts of defoamers, and more specifically, in the present embodiment, air release agent and defoamer adopt respectively wax powder and polyethers oligomer.
In the present embodiment, flow agent, rheological agent and viscosity-depression agent all can adopt any one material in existing known technology, as flow agent can adopt homopolymer and multipolymer and the modified polyorganosiloxane of acrylate, launch no longer one by one in this article to repeat.
Natch, in other embodiments, powder coating provided by the invention can also add other auxiliary agents of certainweight umber, for example add according to actual needs the curing catalysts that promotes curing cross-linking reaction, or add and promote the expanding material of powder coating different components in melt stage consistency, or add aluminum oxide growth agent auxiliary agent etc.
Shown in Figure 1, in the present embodiment, the preparation method of powder coating for above-mentioned edge sealing, wherein, its operation steps comprises as follows:
A), whole raw materials of parts by weight described above put into mixing tank mix, obtain batch mixing;
B), batch mixing that above-mentioned steps a) is obtained is placed in forcing machine and melt extrudes, and then after cooling process, obtains compressing tablet material;
C) the first coarse reduction of compressing tablet material, above-mentioned steps b) being obtained is ground and is obtained fine powder;
D), fine powder that above-mentioned steps c) is obtained separates by cyclonic separator, classification is sieved, and detects, finished product;
E), complete the preparation of medium density fiberboard edge sealing powder coating.
Embodiment 2:
The present embodiment 2 all the other technical schemes are identical with above-described embodiment 1, distinguish and are only, edge sealing comprises the raw material of following portions by weight with powder coating:
25 parts of epoxy resin;
20 parts, solidifying agent;
35 parts of color stuffings;
20 parts of auxiliary agents, particularly, in the present embodiment, auxiliary agent comprises 3 parts of flow agents, 5 parts of rheological agents, 5 portions of viscosity-depression agents, 3 parts of air release agents and 4 parts of defoamers.
Embodiment 3:
The present embodiment 3 all the other technical schemes are identical with above-described embodiment 1, distinguish and are only, edge sealing comprises the raw material of following portions by weight with powder coating:
30 parts of epoxy resin;
18 parts, solidifying agent;
32 parts of color stuffings;
20 parts of auxiliary agents, particularly, in the present embodiment, auxiliary agent comprises 3 parts of flow agents, 5 parts of rheological agents, 5 portions of viscosity-depression agents, 3 parts of air release agents and 4 parts of defoamers.
Embodiment 4:
The present embodiment 4 all the other technical schemes are identical with above-described embodiment 1, distinguish and are only, edge sealing comprises the raw material of following portions by weight with powder coating:
40 parts of epoxy resin;
15 parts, solidifying agent;
25 parts of color stuffings;
20 parts of auxiliary agents, particularly, in the present embodiment, auxiliary agent comprises 3 parts of flow agents, 5 parts of rheological agents, 5 portions of viscosity-depression agents, 3 parts of air release agents and 4 parts of defoamers.
Embodiment 5:
The present embodiment 5 all the other technical schemes are identical with above-described embodiment 1, distinguish and are only, edge sealing comprises the raw material of following portions by weight with powder coating:
50 parts of epoxy resin;
12 parts, solidifying agent;
30 parts of color stuffings;
8 parts of auxiliary agents, particularly, in the present embodiment, auxiliary agent comprises 1 part of flow agent, 0.5 part of rheological agent, 0.5 portion of viscosity-depression agent, 3 parts of air release agents and 3 parts of defoamers.
Embodiment 6:
The present embodiment 6 all the other technical schemes are identical with above-described embodiment 1, distinguish and are only, edge sealing comprises the raw material of following portions by weight with powder coating:
58 parts of epoxy resin;
10 parts, solidifying agent;
22 parts of color stuffings;
10 parts of auxiliary agents, particularly, in the present embodiment, auxiliary agent comprises 2 parts of flow agents, 2 parts of rheological agents, 2 portions of viscosity-depression agents, 2 parts of air release agents and 2 parts of defoamers.
Embodiment 7:
The present embodiment 7 all the other technical schemes are identical with above-described embodiment 1, distinguish and are only, edge sealing comprises the raw material of following portions by weight with powder coating:
70 parts of epoxy resin;
10 parts, solidifying agent;
5 parts of color stuffings;
15 parts of auxiliary agents, particularly, in the present embodiment, auxiliary agent comprises 3 parts of flow agents, 3 parts of rheological agents, 3 portions of viscosity-depression agents, 4 parts of air release agents and 2 parts of defoamers.
Embodiment 8:
The present embodiment 8 all the other technical schemes are identical with above-described embodiment 1, distinguish and are only, edge sealing comprises the raw material of following portions by weight with powder coating:
63 parts of epoxy resin;
2 parts, solidifying agent;
25 parts of color stuffings;
10 parts of auxiliary agents, particularly, in the present embodiment, auxiliary agent comprises 2 parts of flow agents, 2 parts of rheological agents, 2 portions of viscosity-depression agents, 2 parts of air release agents and 2 parts of defoamers.
Embodiment 9:
The present embodiment 9 all the other technical schemes are identical with above-described embodiment 1, distinguish and are only, edge sealing comprises the raw material of following portions by weight with powder coating:
63 parts of epoxy resin;
2 parts, solidifying agent;
35 parts of color stuffings.
Embodiment 10:
The present embodiment 10 all the other technical schemes are identical with above-described embodiment 1, distinguish and are only, epoxy resin is to adopt hypocrystalline technique to prepare.
Embodiment 11:
The present embodiment 11 all the other technical schemes are identical with above-described embodiment 1, distinguish and are only, epoxy resin is to adopt super esterification technique to prepare.
Embodiment 12:
The present embodiment 12 all the other technical schemes are identical with above-described embodiment 1, and difference is only, solidifying agent employing hydrazides class high reactivity solidifying agent.
Embodiment 13:
The present embodiment 13 all the other technical schemes are identical with above-described embodiment 1, difference is, edge sealing coating 200 adopts and on plate body 100 sides, adopts powder coating electrostatic spraying for edge sealing, thermofixation mode to obtain after processing, particularly, in the present embodiment, employing hot-blast furnace equipment is cured, and heat curing temperature is 140 ℃, natch, in other embodiments, can also adopt other heat curing temperatures, preferably, heat curing temperature is 100-200 ℃.
Embodiment 14:
The present embodiment 14 all the other technical schemes are identical with above-described embodiment 1, difference is, edge sealing coating 200 obtains after adopting and adopt powder coating electrostatic spraying for edge sealing, UV spectrum initiation and thermal initiation combined type solidification treatment on plate body 100 sides, particularly, in the present embodiment, the wavelength region of UV spectrum is 0.1-0.2 μ m, and the temperature of thermal initiation is 80 ℃.Natch, in other embodiment, can also select UV spectrum and the thermal initiation temperature of other concrete wavelength regions.
Particularly, in the present embodiment, edge sealing comprises the raw material of following portions by weight with powder coating:
63 parts of unsaturated polyester resins;
5 parts of UV spectrum initiators, the wavelength region of UV spectrum is 0.01-0.4 μ m, preferably, the mixing of any one or a few in UV spectrum initiator employing carbonyl compound class, dye class, metal organic, halide-containing class, azo-compound class and peralcohol class UV spectrum initiator; Further preferably, UV spectrum initiator is any one or a few the mixing in benzoin derivatives, benzil derivative, dialkoxy methyl phenyl ketone, alpha-hydroxyalkyl benzophenone; Particularly, in the present embodiment, UV spectrum initiator is benzil derivative;
5 parts of thermal initiators, the temperature range of its thermal initiation is 60-150 ℃, preferably, thermal initiator is any one or a few the mixing in benzoyl peroxide, azo diethyl heptonitrile, azo diethyl butyronitrile; Particularly, in the present embodiment, thermal initiator is benzoyl peroxide;
20 parts of color stuffings, preferably, color stuffing is transparence, for reflection and absorption UV spectrum, for accelerating the process of curing cross-linking reaction, particularly, in the present embodiment, the color stuffing of transparence is silica powder;
7 parts of auxiliary agents; Particularly, in the present embodiment, auxiliary agent comprises 1 part of flow agent, 0.5 part of rheological agent, 0.5 portion of viscosity-depression agent, 3 parts of air release agents and 2 parts of defoamers, and more specifically, in the present embodiment, air release agent and defoamer adopt respectively wax powder and polyethers oligomer.
Further particularly, in the present embodiment, the producer of UV spectrum adopts mercury lamp and potassium lamp, this is that the surface coverage performance of mercury lamp is good because a large amount of research experiments by the applicant are found, but penetrance is poor, and the surface coverage poor-performing of potassium lamp, but penetrance is good, therefore mercury lamp and potassium lamp are combined with the producer as UV spectrum by the embodiment of the present invention, further improves the solidification effect that embodiment of the present invention UV spectrum causes.
Embodiment 15:
The present embodiment 15 all the other technical schemes are identical with above-described embodiment 14, distinguish and are only, edge sealing comprises the raw material of following portions by weight with powder coating:
25 parts of unsaturated polyester resins;
10 parts of UV spectrum initiators;
10 parts of thermal initiators;
35 parts of color stuffings;
20 parts of auxiliary agents, particularly, in the present embodiment, auxiliary agent comprises 3 parts of flow agents, 5 parts of rheological agents, 5 portions of viscosity-depression agents, 3 parts of air release agents and 4 parts of defoamers.
Embodiment 16:
The present embodiment 16 all the other technical schemes are identical with above-described embodiment 14, distinguish and are only, edge sealing comprises the raw material of following portions by weight with powder coating:
30 parts of unsaturated polyester resins;
2 parts of UV spectrum initiators;
16 parts of thermal initiators
32 parts of color stuffings;
20 parts of auxiliary agents, particularly, in the present embodiment, auxiliary agent comprises 3 parts of flow agents, 5 parts of rheological agents, 5 portions of viscosity-depression agents, 3 parts of air release agents and 4 parts of defoamers.
Embodiment 17:
The present embodiment 17 all the other technical schemes are identical with above-described embodiment 14, distinguish and are only, edge sealing comprises the raw material of following portions by weight with powder coating:
40 parts of unsaturated polyester resins;
12 parts of UV spectrum initiators;
3 parts of thermal initiators
25 parts of color stuffings;
20 parts of auxiliary agents, particularly, in the present embodiment, auxiliary agent comprises 3 parts of flow agents, 5 parts of rheological agents, 5 portions of viscosity-depression agents, 3 parts of air release agents and 4 parts of defoamers.
Embodiment 18:
The present embodiment 18 all the other technical schemes are identical with above-described embodiment 14, distinguish and are only, edge sealing comprises the raw material of following portions by weight with powder coating:
50 parts of unsaturated polyester resins;
6 parts of UV spectrum initiators;
6 parts of thermal initiators;
30 parts of color stuffings;
8 parts of auxiliary agents, particularly, in the present embodiment, auxiliary agent comprises 1 part of flow agent, 0.5 part of rheological agent, 0.5 portion of viscosity-depression agent, 3 parts of air release agents and 3 parts of defoamers.
Embodiment 19:
The present embodiment 19 all the other technical schemes are identical with above-described embodiment 14, distinguish and are only, edge sealing comprises the raw material of following portions by weight with powder coating:
50 parts of unsaturated polyester resins;
20 parts of UV spectrum initiators;
1 part of thermal initiator;
19 parts of color stuffings;
10 parts of auxiliary agents, particularly, in the present embodiment, auxiliary agent comprises 2 parts of flow agents, 2 parts of rheological agents, 2 portions of viscosity-depression agents, 2 parts of air release agents and 2 parts of defoamers.
Embodiment 20:
The present embodiment 20 all the other technical schemes are identical with above-described embodiment 14, distinguish and are only, edge sealing comprises the raw material of following portions by weight with powder coating:
70 parts of unsaturated polyester resins;
1 part of UV spectrum initiator;
20 parts of thermal initiators;
5 parts of color stuffings;
4 parts of auxiliary agents, particularly, in the present embodiment, auxiliary agent comprises 0.5 part of flow agent, 1 part of rheological agent, 1 portion of viscosity-depression agent, 1 part of air release agent and 0.5 part of defoamer.
Embodiment 21:
The present embodiment 21 all the other technical schemes are identical with above-described embodiment 14, distinguish and are only, edge sealing comprises the raw material of following portions by weight with powder coating:
63 parts of unsaturated polyester resins;
1 part of UV spectrum initiator;
1 part of thermal initiator;
25 parts of color stuffings;
10 parts of auxiliary agents, particularly, in the present embodiment, auxiliary agent comprises 2 parts of flow agents, 2 parts of rheological agents, 2 portions of viscosity-depression agents, 2 parts of air release agents and 2 parts of defoamers.
Embodiment 22:
The present embodiment 22 all the other technical schemes are identical with above-described embodiment 14, distinguish and are only, edge sealing comprises the raw material of following portions by weight with powder coating:
63 parts of epoxy resin;
1 part of UV spectrum initiator;
1 part of thermal initiator;
35 parts of color stuffings.
Embodiment 23:
The present embodiment 23 all the other technical schemes are identical with above-described embodiment 14, and difference is only, the super resin ester of powder coating employing for edge sealing.
Embodiment 24:
The present embodiment 24 all the other technical schemes are identical with above-described embodiment 14, and difference is only, UV spectrum initiator employing benzoin derivatives, and thermal initiator adopts azo diethyl heptonitrile.
Comparative example 1:
This comparative example 1 all the other technical schemes are identical with above-described embodiment 1, and difference is, this comparative example 1 adopts business-like low temperature cured powder coating to carry out edge sealing to medium density fiberboard and obtains edge sealing coating.
Comparative example 2:
This comparative example 2 all the other technical schemes are identical with above-described embodiment 14, and difference is, this comparative example 2 adopts business-like conventional powder coating to carry out edge sealing to medium density fiberboard and obtains edge sealing coating.
Comparative example 3:
This comparative example 3 all the other technical schemes are identical with above-described embodiment 1, and difference is, it is that the disclosed preparation method of PCT patent of WO2013/078648A1 carries out edge sealing to medium density fiberboard and prepares edge sealing coating, edge sealing process complexity that this comparative example 3 adopts publication number.
Comparative example 4:
This comparative example 4 all the other technical schemes are identical with above-described embodiment 1, difference is, this comparative example 4 adopts Granted publication number to prepare edge sealing coating for the disclosed edge bonding method of Chinese patent of CN202862329U carries out edge sealing to medium density fiberboard, applying number of times is 1 time, edge sealing coating is thin, edge sealing process complexity.
Comparative example 5:
This comparative example 5 all the other technical schemes are identical with above-described embodiment 1, difference is, this comparative example 5 adopts Granted publication number to prepare edge sealing coating for the disclosed edge bonding method of Chinese patent of CN202862329U carries out edge sealing to medium density fiberboard, and applying number of times is 4 times, edge sealing process complexity.
Comparative example 6:
This comparative example 6 all the other technical schemes are identical with above-described embodiment 1, difference is only, it is the disclosed edge bonding method of Chinese patent of CN202862329U that this comparative example 6 adopts Granted publication number, but further adding thermal initiator to carry out liquid in conjunction with this edge bonding method applies, realization is carried out edge sealing to medium density fiberboard and is prepared edge sealing coating, applying number of times is 1 time, edge sealing process complexity.
The implementation result comparison of all kinds of medium density fiberboard edge sealing of table 1 coating
The present invention also endpoint value of the each composition to powder coating composition tests respectively, can obtain equally similar good implementation result, in order to save length herein, will not enumerate and repeats at this.
The present invention adopts differential scanning calorimetric analysis instrument the in full described film-forming time, and tests acquired results with reference to ISO11357 standard; Described thickness refers to the thickness of edge sealing coating, is to adopt desk type wood to creep into row test acquired results; Described cross-hatching sticking power is to test acquired results with reference to GB/T9286-1998 standard; Described levelling property is to test acquired results with reference to ASTM D2801 standard; Whether described water-soluble swollen test refers to the medium density fiberboard with edge sealing coating is fully immersed in water, observe edge sealing coating and ftracture.
Can obviously find out from table 1 data, the film-forming speed of various embodiment of the present invention is very fast, and the mechanical property of edge sealing coating, flow leveling and water-fast swelling behavior all show excellence, and realize and adopt electrostatic spraying, edge sealing process is simple and convenient, be applicable to the edge sealing of different shape base material workpiece, also can specifically select according to actual machine strength demand the thickness of spraying simultaneously, further meet the requirement of mechanical strength of different medium density fiberboard for edge sealing coating, and comparative example 1 and comparative example 2 after water-soluble swollen test 1h and produce cracking phenomena in solidification process, cannot prepare qualified edge sealing coating respectively after film-forming, and although comparative example 3 can obtain better edge sealing coating performance, but because being adopts liquid to apply (being equivalent to adopt paint application), edge sealing process complexity, the medium density fiberboard being not suitable for having complicated shape structure is carried out edge sealing, the penetrance that liquid applies is simultaneously poor, cannot realize thick painting, the intensity of edge sealing coating and levelling property are all restricted, finally cannot make and obtain high-quality medium density fiberboard edge sealing coating, and comparative example 4 is because the penetrance of UV spectrum is poor, can only realize solidifying shallow layer, therefore very thin through the edge sealing coating that single applies, UV spectrum is curing, finally cause its non-constant of edge sealing coating machine intensity preparing, cannot practical requirement, and comparative example 5 is in order to overcome the defect existing in comparative example 4, carry out repeatedly applying for 4 times, UV spectrum solidify after can prepare better edge sealing coating performance, and comparative example 6 is in order to overcome the defect existing in comparative example 5, add thermal initiator to solidify, but implementation result and comparative example 4 are basic identical, therefore the liquid of UV spectrum initiator and thermal initiator applies to solidify and does not have improvement effect, and, identical with comparative example 3, comparative example 4, comparative example 5 and comparative example 6 due to be all adopt liquid apply (being equivalent to adopt paint application), edge sealing process complexity, the medium density fiberboard being not suitable for having complicated shape structure is carried out edge sealing, the penetrance that liquid applies is simultaneously poor, cannot realize thick painting, intensity and the levelling property of edge sealing coating are all restricted, finally cannot make and obtain high-quality medium density fiberboard edge sealing coating, in addition, comparative example 3, 4, 5, 6 all more not possess powder coating distinctive " containing organic solvent, the feature of environmental protection is good, utilization ratio is high, and store, convenient transportation " etc. advantage.
To those skilled in the art, obviously the invention is not restricted to the details of above-mentioned one exemplary embodiment, and in the situation that not deviating from spirit of the present invention or essential characteristic, can realize the present invention with other specific form.Therefore, no matter from which point, all should regard embodiment as exemplary, and be nonrestrictive, scope of the present invention is limited by claims rather than above-mentioned explanation, is therefore intended to all changes that drop in the implication and the scope that are equal to important document of claim to include in the present invention.Any Reference numeral in claim should be considered as limiting related claim.
In addition, be to be understood that, although this specification sheets is described according to embodiment, but be not that each embodiment only comprises an independently technical scheme, this narrating mode of specification sheets is only for clarity sake, those skilled in the art should make specification sheets as a whole, and the technical scheme in each embodiment also can, through appropriately combined, form other embodiments that it will be appreciated by those skilled in the art that.
Claims (10)
1. a medium density fiberboard, comprises medium density fiberboard plate body, and described plate body side has edge sealing coating, and in described edge sealing coating and described plate body surface is provided with thermosetting coating, it is characterized in that,
Described edge sealing coating obtains after adopting and adopt powder coating electrostatic spraying for edge sealing, solidification treatment on plate body side;
Described thermosetting coating obtains after adopting and adopt powder coating electrostatic spraying for low-temperature curing, solidification treatment in described edge sealing coating and on described plate body surface.
2. medium density fiberboard as claimed in claim 1, is characterized in that, the curing employing infrared spectra curing mode of described edge sealing coating, and the wavelength region of described infrared spectra is 0.75-1000 μ m.
3. medium density fiberboard as claimed in claim 1, is characterized in that, the curing employing thermofixation mode of described edge sealing coating, and described heat curing temperature scope is 100-200 ℃.
4. medium density fiberboard as claimed in claim 1, it is characterized in that, the curing employing UV spectrum of described edge sealing coating causes and thermal initiation combined type curing mode, and the wavelength region of described UV spectrum is 0.01-0.4 μ m, and the temperature range of described thermal initiation is 60-150 ℃.
5. medium density fiberboard as claimed in claim 2 or claim 3, is characterized in that, described edge sealing comprises the raw material of following portions by weight with powder coating:
Wherein, described epoxy resin is to adopt hypocrystalline or holocrystalline or super esterification technique to prepare, for reducing viscosity and raising curing speed.
6. medium density fiberboard as claimed in claim 5, is characterized in that, described solidifying agent is any one or a few mixing of imidazolines, hydrazides class, phenolic solidifying agent, for improving the intensity of described curing cross-linking reaction; Described color stuffing is the mixing of any one or two kinds in titanium nickel class, pucherite class inorganic color stuffing, for reflection with absorb infrared spectra, accelerates the process of described curing cross-linking reaction.
7. medium density fiberboard as claimed in claim 4, is characterized in that, described powder coating comprises the raw material of following portions by weight:
8. medium density fiberboard as claimed in claim 7, is characterized in that, described UV spectrum initiator is any one or a few the mixing in benzoin derivatives, benzil derivative, dialkoxy methyl phenyl ketone, alpha-hydroxyalkyl benzophenone; Described thermal initiator is any one or a few the mixing in benzoyl peroxide, azo diethyl heptonitrile, azo diethyl butyronitrile; Described color stuffing is transparence, for reflection and absorption UV spectrum.
9. medium density fiberboard as claimed in claim 8, is characterized in that, the producer of described UV spectrum adopts mercury lamp and potassium lamp.
10. medium density fiberboard as claimed in claim 7, is characterized in that, described auxiliary agent comprises any one or a few of flow agent, rheological agent, viscosity-depression agent, air release agent, defoamer; Described air release agent and/or defoamer adopt the mixing of any one or two kinds in wax powder, polyethers oligomer.
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| CN201410025357.5A CN103805026A (en) | 2014-01-20 | 2014-01-20 | Medium-density fiberboard |
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| CN201410025357.5A CN103805026A (en) | 2014-01-20 | 2014-01-20 | Medium-density fiberboard |
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| CN104497816A (en) * | 2014-12-31 | 2015-04-08 | 山东朗法博粉末涂装科技有限公司 | Medium density fiberboard employing high-permeability nano water-based resin edge banding |
| CN106566376A (en) * | 2016-10-19 | 2017-04-19 | 武汉科技大学 | Low-light-leveling and low-temperature-curing epoxy powder coating used for coating medium-density fiberboard |
| CN111921808A (en) * | 2020-08-13 | 2020-11-13 | 上海市富力达科技股份有限公司 | Powder spraying method for carbon fiber composite material plate |
| CN112266724A (en) * | 2020-11-02 | 2021-01-26 | 佛山市协通橡塑制品有限公司 | Coating for wear-resistant layer of running board, preparation method of coating and running board |
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| CN112266724A (en) * | 2020-11-02 | 2021-01-26 | 佛山市协通橡塑制品有限公司 | Coating for wear-resistant layer of running board, preparation method of coating and running board |
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Application publication date: 20140521 |