CN104152029B - A kind of high-temperature resistant nano hole thermal insulation coatings and preparation method - Google Patents
A kind of high-temperature resistant nano hole thermal insulation coatings and preparation method Download PDFInfo
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- Paints Or Removers (AREA)
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Abstract
The invention belongs to high-temperature energy-saving coating material field, be specifically related to a kind of high-temperature resistant nano hole thermal insulation coatings and preparation method。Described coating is made up of the component of following weight portion: aerogel powder 5-15 part, filler 10-20 part, and length is chopped fiber 5-10 part of 1-3mm, film forming matter 30-40 part, solvent 10-50 part;It is possible to additionally incorporate the defoamer of the dispersant of 0.1-0.2 part, the coupling agent of 0.15-0.3 part and 0.05-0.15 part。High-temperature resistant nano hole of the present invention thermal insulation coatings provides the benefit that: 1) lower thermal conductivity;2) high temperature resistant;3) under high temperature, (more than 600 DEG C) are strong with matrix bonding force;4) technique is simple。
Description
Technical field
The invention belongs to high-temperature energy-saving coating material field, be specifically related to a kind of high-temperature resistant nano hole thermal insulation coatings and preparation method。
Technical background
World today's mineral resources energy worsening shortages, the development of world industry in serious threat。Industrial Stoves power consumption accounts for the 25%~40% of total energy consumption, mainly due to heat by furnace lining and furnace outer wall deterioration, therefore, develop the high temperature high efficiency energy-saving and heat-insulating paint being applied in Industrial Stoves inwall, thus it is significant to improving resource utilization by furnace lining and furnace outer wall deterioration to reduce heat。
Nano-pore heat-barrier material refers to the bore dia porous material at nano-scale of material internal。The mechanism of heat insulation of nano-pore heat-barrier material is mainly reflected in the following aspects。First, the contact area between nano-particle is less, and therefore, its thermal conductivity is also little compared with other heat-barrier materials;Secondly, according to molecular motion and collision theory, gas heat-transfer mutually collides mainly by the high-velocity molecular of high temperature side and the low speed molecule of low temperature side and realizes, due to main component N in air2And O2Mean free path be about 70nm, so when the aperture of material internal is less than this critical dimension, the convection heat transfer' heat-transfer by convection of gas molecule is suppressed, thus obtaining ratio without convected air lower thermal conductivity。At present, high temperature resistant heat insulation coating on domestic and international high temperature kiln is of a great variety, but mostly unsatisfactory in technical performance and result of use, is primarily due to the pore structure within prepared thermal insulation coatings and is in macro-scale, thermal conductivity is higher, and effect of heat insulation is not ideal enough;Adopting foam plastics on the other hand is that raw material uses temperature not high, is mainly used in hot water pipeline and building trade。Patent of invention " a kind of nano ceramic high-temperature-resistant thermal-insulation coating and its preparation method and application " (number of patent application: 200610113748.8) is with ceramic fine bead, perlite, glass microballoon etc. for primary raw material, the internal aperture of these raw materials is all in macro-scale, belong to traditional insulation materials, nano material needs to form through stirring, drying and dehydrating and grinding, and technics comparing is complicated。Patent of invention " a kind of nano thermal insulation coating " (number of patent application: 201210554146.1) is main with nano-aluminum phosphate, nano manganese oxide, nano zircite, nano titanium carbide, nano-pearl rock, nanometer calcium silicate powder for raw material, the coating of preparation can be used only in room temperature or middle low temperature environment, is used in that these raw materials of hot environment are easily sintered, crystal is grown up and lost the character of nano material。Patent of invention " a kind of high temperature resistant heat insulation coating " (number of patent application: 201310245274.2) selects heat stable resin, hollow microsphere inorganic filler, needle-like cordierite powder, graphite, molybdenum bisuphide are raw material, the aperture of this insulating moulding coating is bigger, the thermal conductivity of graphite raw material is higher and oxidizable under high temperature, therefore uses temperature not high。If thermal insulation coatings can be realized at high temperature can keep the character of nano-pore structure, to improving the energy-conservation significant of Industrial Stoves。
Summary of the invention
It is an object of the invention to provide a kind of high-temperature resistant nano hole thermal insulation coatings and preparation method。
The present invention seeks to be achieved through the following technical solutions:
A kind of high-temperature resistant nano hole thermal insulation coatings, described coating is made up of the component of following weight portion: aerogel powder 5-15 part, filler 10-20 part, length is chopped fiber 5-10 part of 1-3mm, film forming matter 30-40 part, solvent 10-50 part, it is possible to additionally incorporate the defoamer of the dispersant of 0.1-0.2 part, the coupling agent of 0.15-0.3 part and 0.05-0.15 part。
Described filler is one or more arbitrary proportions mixing in nano oxidized silica flour, nano alumina powder, nano oxidized zirconium powder。
Described aerogel powder is the silica aerogel powder with nanoaperture structure that Zhong Shankebang chemical materials Technology Co., Ltd. produces, and powder diameter is sized to 1-100 micron。
Described chopped fiber is one or more in zirconia crystal fiber, alpha-alumina crystals fiber, mullite crystal fiber and high aluminum fiber。
Described film forming matter is one or more arbitrary proportions mixing in silicone resin emulsion, polyurethane resin, acrylic resin, Ludox and styrene-acrylic emulsion。
Described solvent is one or both in ethanol or deionized water;Described dispersant is the one in the polyethylene glycol type water reducer CAMTMENTFS10 that sodium tripolyphosphate, sodium hexameta phosphate, ammonium polyacrylate and BASF Aktiengesellschaft produce;Described coupling agent is silane coupler;Described defoamer is the one in organic silicon defoamer or polyether-modified silicon defoaming agent。
Raw material used in the present invention can be commercially available, and specification meets country or industry standard。
The preparation method of above-mentioned high-temperature resistant nano hole thermal insulation coatings, its preparation method is: weigh solvent according to proportioning and dispersant is put in homogenizer and stirred 5-10 minute with the rotating speed of 500-1000rpm, make dispersant be completely dissolved in solvent;Add nano-sized filler powder by proportioning to stir with the rotating speed of 5000-8000rpm, high rotating speed and dispersant combined effect are fully opened soft-agglomerated for nanometer powder part, it is evenly distributed in solvent, the aerosil adding respective amount after stirring 10-30 minute is stirred for 10-30 minute with identical rotating speed, can make on the one hand that aerogel powder is fully dispersed to be opened, on the other hand nanometer powder and aerogel powder be mixed uniformly;It is subsequently adding film forming matter to stir 10-30 minute with the rotating speed of 1000-2000rpm, if film forming matter is easily caused emulsion breaking containing emulsion rotating speed is too high and loses due effect;Finally it is sequentially added into chopped fiber, defoamer and coupling agent by proportioning to stir 30-60 minute with the rotating speed of 1000-2000rpm, namely obtains high-temperature resistant nano hole thermal insulation coatings。
Chopped fiber plays skeleton function in the coating, can keep the stability of coating on the one hand, and the high temperature sintering that can reduce coating on the other hand shrinks, reduces the high-temperature heat conductivity of coating and the effect of hinder coating cracking;Defoamer can eliminate the foam in coating and improve the mobility of coating;Coupling agent can improve the room temperature cementability of coating and matrix (material that coating to be brushed), and hinder coating ftractures。
It is an object of the invention to thermal insulation coatings and be internally formed nano-pore structure。The present invention selects aerosil to be primary raw material, and it is possible to additionally incorporate some nanometer powders is implant, forms nanopore network structure with the chopped fiber that length is 1-3mm for skeleton。SiO2Aerogel powder has the nanoscale pore structure of complexity, SiO2Aeroge is different from the porous material of macroscopic void, and the thermal conductivity that its very thin nanostructured makes material is extremely low, has great specific surface area, and the scattering of light, sound is all much smaller than traditional porous material。SiO2The nanoaperture of aeroge and the crooked route of fiber multihole network structure prevent the gaseous heat conduction of air and the solid state heat conduction of gel skeleton respectively, can also blocking radiant heat by dopen Nano powder。This 3 aspect combined effect, has almost blocked all approach of hot transmission, has made SiO2Aeroge plays good insulation effect。SiO2The heat conductivity of aeroge is at 0.013W/ (m K) below, far below the heat conductivity [0.025W/ (m K)] of still air under room temperature, and have that density is low, water proof fire retardant, environmental protection, anti-soda acid are corrosion-resistant, the not easily feature such as aging, long service life。The present invention selects SiO2Aeroge and nanometer powder are as the raw material preparing nano-pore thermal insulation coatings, it is possible to make coating possess the construction features of nano-pore, have ultralow thermal conductivity and SiO2Airsetting rubber powder belongs to the inorganic material of loose shape, adds high-temperature fibre and Nano filling can ensure that coating at high temperature uses。
The difficult point of the technology of the present invention is in that SiO2Sintering shrinkage under the dispersibility of aeroge and high temperature。SiO2Aeroge belongs to and is connected with each other solid micelle, through surface modification with process the SiO making very hydrophobic performance2Aerogel powder, aerogel powder is in a solvent through high-speed stirred and dispersant, and its dispersion effect neither be very good。After nanometer powder and dispersant are sufficiently stirred for by the present invention again and SiO2Aeroge stirs together, and aeroge soft-agglomerated to nanometer powder and part is scatter by dispersant, and scattered nano-particles filled is opened soft-agglomerated for major part aeroge to aeroge is internal by high-speed stirred, so can realize nanometer powder and SiO2Aeroge good dispersion。SiO2Aeroge is all made up of colloidal particle, at high temperature uses (more than 600 DEG C) easily generation sintering shrinkage cause the cracking of coating and come off, affects serviceability。Resistant to elevated temperatures chopped fiber is joined in thermal insulation coatings by the present invention, plays the effect of skeleton in coating, plays the effect hindering aeroge sintering shrinkage on the one hand, and the intensity and the porosity that improve coating on the other hand reduce heat conductivity。
High-temperature resistant nano hole of the present invention thermal insulation coatings provides the benefit that:
1) lower thermal conductivity。The present invention selects the aerosil with nano-pore structure to be primary raw material, and the thermal conductivity of aerosil is at 0.013W/ (m K) below, it is possible to make coating have relatively low thermal conductivity。Mutually pile up can form nano-pore structure it addition, the nanometer powder that the present invention selects is filler with aeroge, coating adds chopped fiber and is possible not only to improve the intensity of coating and the thermal conductivity of coating can be reduced。
2) high temperature resistant。The present invention selects several inorganic material to combine, and selects fiber to reduce coating shrinkage, select resistant to elevated temperatures inorganic filler to improve the use temperature of coating in coating, and the coating maximum operation (service) temperature prepared by the present invention is up to 1000 DEG C。
3) under high temperature, (more than 600 DEG C) are strong with matrix bonding force。Major part thermal insulation coatings uses the not high one side of temperature to be because coating itself based on Organic substance, and pore structure is formed by Organic substance;Selecting organic bond on the other hand, when temperature is too high, coating easily comes off。The nano-sized filler that the present invention selects at high temperature can interpenetrate with refractory material matrix, be sintered to one can ensure that coating and matrix are completely embedded, and coating does not fall off。
4) technique is simple。The present invention is raw materials used needs not move through mixing, drying, broken and grinding, and coating once stirs and can use。
Detailed description of the invention
In conjunction with the embodiment provided, the present invention is illustrated:
Embodiment 1: a kind of high-temperature resistant nano hole thermal insulation coatings, it is made up of following weight portion, the aerosil of nano-pore structure 5 parts, nano zircite 3 parts, nano silicon oxide 10 parts, nano aluminium oxide 7 parts, alpha-alumina crystals chopped fiber 2 parts, mullite crystal chopped fiber 3 parts, high alumina chopped fiber (Al2O3>=40w%) 5 parts, organic siliconresin 30 parts, deionized water 30 parts, ethanol 5 parts, polyethylene glycol type water reducer CAMTMENTFS10 dispersant 0.15 part that BASF Aktiengesellschaft produces, silane coupler 0.3 part, organic silicon defoamer 0.05 part。
According to said ratio weigh deionized water, ethanol and dispersant put into homogenizer stirs 10 minutes with the rotating speed of 500rpm after add after corresponding nano zircite, aluminium oxide and silicon oxide powder stir 30 minutes with the rotating speed of 8000rpm, the aerosil adding respective amount is stirred for 10 minutes with the rotating speed of 8000rpm;It is subsequently adding organic siliconresin to stir 30 minutes with the rotating speed of 2000rpm;Finally it is sequentially added into chopped fiber, organic silicon defoamer and silane coupler by proportioning to stir 30 minutes with the rotating speed of 2000rpm, namely obtains high-temperature resistant nano hole thermal insulation coatings。
Embodiment 2: a kind of high-temperature resistant nano hole thermal insulation coatings and preparation method, it is made up of following weight portion, the aerosil of nano-pore structure 10 parts, nano silicon oxide 10 parts, nano aluminium oxide 7 parts, mullite crystal chopped fiber 3 parts, high alumina chopped fiber (Al2O3>=40w%) 2 parts, polyurethane resin 40 parts, deionized water 10 parts, ethanol 18 parts, polyethylene glycol type water reducer CAMTMENTFS20 dispersant 0.2 part that additional BASF Aktiengesellschaft produces, silane coupler 0.15 part, organic silicon defoamer 0.15 part。
According to said ratio weigh deionized water, ethanol and dispersant put into homogenizer stirs 5 minutes with the rotating speed of 1000rpm after add after corresponding nano aluminium oxide and silicon oxide powder stir 10 minutes with the rotating speed of 8000rpm, the aerosil adding respective amount is stirred for 30 minutes with the rotating speed of 8000rpm;It is subsequently adding polyurethane resin to stir 10 minutes with the rotating speed of 1000rpm;Finally it is sequentially added into mullite crystal chopped fiber and high alumina chopped fiber, organic silicon defoamer and silane coupler by proportioning to stir 60 minutes with the rotating speed of 1000rpm, namely obtains high-temperature resistant nano hole thermal insulation coatings。
Embodiment 3: a kind of high-temperature resistant nano hole thermal insulation coatings and preparation method, is made up of following weight portion, the aerosil of nano-pore structure 15 parts, nano silicon oxide 10 parts, crystal of zirconium oxide chopped fiber 3 parts, high alumina chopped fiber (Al2O3>=40w%) 2 parts, polyurethane resin 30 parts, Ludox 10 parts, deionized water 30 parts, ethanol 10 parts, polyethylene glycol type water reducer CAMTMENTFS10 dispersant 0.15 part that BASF Aktiengesellschaft produces, silane coupler 0.3 part, polyether-modified silicon defoaming agent 0.05 part。
According to said ratio weigh deionized water, ethanol and dispersant put into homogenizer stirs 10 minutes with the rotating speed of 800rpm after add after corresponding nano oxidized Si powder stirs 20 minutes with the rotating speed of 6000rpm, the aerosil adding respective amount is stirred for 20 minutes with the rotating speed of 6000rpm;It is subsequently adding polyurethane resin and Ludox to stir 15 minutes with the rotating speed of 800rpm;Finally it is sequentially added into crystal of zirconium oxide chopped fiber and high alumina chopped fiber, polyether-modified silicon defoaming agent and silane coupler by proportioning to stir 45 minutes with the rotating speed of 800rpm, namely obtains high-temperature resistant nano hole thermal insulation coatings。
Embodiment 4: a kind of high-temperature resistant nano hole thermal insulation coatings and preparation method, it is made up of following weight portion, the aerosil of nano-pore structure 10 parts, nano zircite 5 parts, nano silicon oxide 10 parts, nano aluminium oxide 5 parts, alpha-alumina crystals chopped fiber 5 parts, mullite crystal chopped fiber (Al2O3>=40w%) 5 parts, acrylic resin 30 parts, Ludox 20 parts, deionized water 25 parts, additional sodium tripolyphosphate dispersant 0.15 part, silane coupler 0.2 part, polyether-modified silicon defoaming agent 0.1 part。
Weighing deionized water according to said ratio and dispersant is put into and added after corresponding nano zircite, aluminium oxide and silicon oxide powder stir 10 minutes with the rotating speed of 5000rpm after stirring 5 minutes with the rotating speed of 500rpm in homogenizer, the aerosil adding respective amount is stirred for 30 minutes with the rotating speed of 5000rpm;It is subsequently adding acrylic resin and Ludox to stir 10 minutes with the rotating speed of 1000rpm;Finally it is sequentially added into aluminium oxide and mullite crystal chopped fiber, organic silicon defoamer and silane coupler by proportioning to stir 30 minutes with the rotating speed of 1000rpm, namely obtains high-temperature resistant nano hole thermal insulation coatings。
Embodiment 5: a kind of high-temperature resistant nano hole thermal insulation coatings and preparation method, it is made up of following weight portion, the aerosil of nano-pore structure 10 parts, nano zircite 10 parts, nano silicon oxide 5 parts, nano aluminium oxide 5 parts, crystal of zirconium oxide chopped fiber 2 parts, mullite crystal chopped fiber 3 parts, styrene-acrylic emulsion 30 parts, Ludox 15 parts, ethanol 40 parts, ammonium polyacrylate dispersant 0.15 part, silane coupler 0.2 part, organic silicon defoamer 0.05 part。
Weighing ethanol according to said ratio and dispersant is put into and added after corresponding nano zircite, aluminium oxide and silicon oxide powder stir 10 minutes with the rotating speed of 7000rpm after stirring 8 minutes with the rotating speed of 600rpm in homogenizer, the aerosil adding respective amount is stirred for 25 minutes with the rotating speed of 7000rpm;It is subsequently adding styrene-acrylic emulsion and Ludox to stir 10 minutes with the rotating speed of 1500rpm;Finally it is sequentially added into zirconium oxide and mullite crystal chopped fiber, organic silicon defoamer and silane coupler by proportioning to stir 50 minutes with the rotating speed of 1500rpm, namely obtains high-temperature resistant nano hole thermal insulation coatings。
Embodiment 6: a kind of high-temperature resistant nano hole thermal insulation coatings and preparation method, is made up of following weight portion, the aerosil of nano-pore structure 5 parts, nano alumina powder 20 parts, high alumina chopped fiber (Al2O3>=40w%) 10 parts, acrylic resin 10 parts, styrene-acrylic emulsion 25 parts, deionized water 20 parts, ethanol 15 parts, sodium hexameta phosphate dispersant 0.2 part, silane coupler 0.2 part, polyether-modified silicon defoaming agent 0.1 part。
According to said ratio weigh deionized water, ethanol and dispersant put into homogenizer stirs 7 minutes with the rotating speed of 1000rpm after add after corresponding Nano-sized Alumina Powder stirs 15 minutes with the rotating speed of 6000rpm, the aerosil adding respective amount is stirred for 25 minutes with the rotating speed of 6000rpm;It is subsequently adding acrylic resin and styrene-acrylic emulsion to stir 10 minutes with the rotating speed of 1600rpm;Finally it is sequentially added into high alumina chopped fiber, polyether-modified silicon defoaming agent and silane coupler by proportioning to stir 35 minutes with the rotating speed of 1600rpm, namely obtains high-temperature resistant nano hole thermal insulation coatings。
Embodiment 7: a kind of high-temperature resistant nano hole thermal insulation coatings and preparation method, is made up of following weight portion, the aerosil of nano-pore structure 10 parts, nano silicon oxide 20 parts, mullite crystal chopped fiber 3 parts, high alumina chopped fiber (Al2O3>=40w%) 2 parts, polyurethane resin 30 parts, deionized water 20 parts, ethanol 30 parts, polyethylene glycol type water reducer CAMTMENTFS10 dispersant 0.1 part that additional BASF Aktiengesellschaft produces, silane coupler 0.15 part, organic silicon defoamer 0.15 part。
According to said ratio weigh deionized water, ethanol and dispersant put into homogenizer stirs 5 minutes with the rotating speed of 7000rpm after add after corresponding nano aluminium oxide and silicon oxide powder stir 30 minutes with the rotating speed of 5000rpm, the aerosil adding respective amount is stirred for 30 minutes with the rotating speed of 5000rpm;It is subsequently adding polyurethane resin to stir 10 minutes with the rotating speed of 1000rpm;Finally it is sequentially added into mullite crystal chopped fiber and high alumina chopped fiber, organic silicon defoamer and silane coupler by proportioning to stir 60 minutes with the rotating speed of 1000rpm, namely obtains high-temperature resistant nano hole thermal insulation coatings。
Claims (5)
1. a high-temperature resistant nano hole thermal insulation coatings, it is characterized in that described coating is made up of the component of following weight portion: aerogel powder 5-15 part, filler 10-20 part, length is chopped fiber 5-10 part of 1-3mm, film forming matter 30-40 part, solvent 10-50 part, it is possible to additionally incorporate the defoamer of the dispersant of 0.1-0.2 part, the coupling agent of 0.15-0.3 part and 0.05-0.15 part;The preparation method of a kind of high-temperature resistant nano hole thermal insulation coatings, weighs solvent according to proportioning and dispersant is put in homogenizer and stirred 5-10 minute with the rotating speed of 500-1000rpm, make dispersant be completely dissolved in solvent;Add filler by proportioning to stir with the rotating speed of 5000-8000rpm, high rotating speed and dispersant combined effect are fully opened soft-agglomerated for filler part, it is evenly distributed in solvent, add aerogel powder after stirring 10-30 minute and be stirred for 10-30 minute with identical rotating speed, can make on the one hand that aerogel powder is fully dispersed to be opened, on the other hand nanometer powder and aerogel powder be mixed uniformly;It is subsequently adding film forming matter to stir 10-30 minute with the rotating speed of 1000-2000rpm;Finally it is sequentially added into chopped fiber, defoamer and coupling agent by proportioning to stir 30-60 minute with the rotating speed of 1000-2000rpm, namely obtains high-temperature resistant nano hole thermal insulation coatings;Described aerogel powder is the silica aerogel powder with nanoaperture structure, and powder diameter is 1-100 micron;Described filler is the mixture of one or more arbitrary proportions in nano oxidized Si powder, Nano-sized Alumina Powder, nano zirconium oxide powder。
2. a kind of high-temperature resistant nano hole as claimed in claim 1 thermal insulation coatings, it is characterised in that described chopped fiber is one or more in zirconia crystal fiber, alpha-alumina crystals fiber, mullite crystal fiber and high aluminum fiber。
3. a kind of high-temperature resistant nano hole as claimed in claim 1 thermal insulation coatings, it is characterised in that described film forming matter is one or more arbitrary proportions mixing in silicone resin emulsion, waterborne polyurethane resin, water-borne acrylic resin, Ludox。
4. a kind of high-temperature resistant nano hole as claimed in claim 1 thermal insulation coatings, it is characterised in that described solvent is one or both in ethanol and deionized water。
5. a kind of high-temperature resistant nano hole as claimed in claim 1 thermal insulation coatings, it is characterised in that described dispersant is the one in sodium tripolyphosphate, sodium hexameta phosphate, ammonium polyacrylate and polyethylene glycol type water reducer;Described coupling agent is silane coupler;Described defoamer is organic silicon defoamer。
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