CN105565843A - Highly-light-transmitting highly-heat-insulating composite material and preparation method thereof - Google Patents
Highly-light-transmitting highly-heat-insulating composite material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a highly-light-transmitting highly-heat-insulating composite material and a preparation method thereof. Silicon dioxide aerogel serving as a super heat-insulation material is adopted to be subjected to surface chemical state regulation and is composited with an AM (acrylamide) and MMA (methyl methacrylate) bulk copolymerization system to prepare the composite material, and the prepared polymer composite material with the silicon dioxide aerogel being functionalized is high in heat insulation and light transmission and the like. The highly-light-transmitting highly-heat-insulating composite material and the preparation method thereof have the advantages that since the functionalized silicon dioxide aerogel serves as a PMMA functionalized phase, heat insulation performance and visible light transmittance of PMMA can be enhanced, and conditions are created for popularizing the PMMA to the field of heat insulation of transparent building envelopes.
Description
Technical field
The invention belongs to building heat preservation lagging material field, more particularly, relate to a kind of high printing opacity, high heat-insulation composite material and preparation method thereof.
Background technology
In building energy consumption, the calorific loss of transparent enclosure structure accounts for very large proportion, and its reason is derived from the low thermal insulation of glass of building component to a great extent.Particularly increasingly severe instantly in environment and energy problem; improve the heat insulating level of building transparent enclosure structure; make great efforts to advance building energy conservation, for improving building thermal environments, alleviate environmental pollution, resource of preserving our planet and ecotope all have comparatively deep meaning.People recognize building transparent enclosure structure heat dissipation capacity this problem large very early in fact, propose the method that some improve glass component thermal insulation, such as hollow or vacuum glass, heat-reflecting glass, Low-E glass and pad pasting glass etc.But these methods fundamentally do not solve the problem of transparent enclosure structure heat radiation, the heat preservation and insulation method of these glass components also reaches far away our expection (Liu Nianxiong, Qin Youguo, building thermal environments in other words conj.or perhaps, press of Tsing-Hua University, 2005).
Polymethylmethacrylate (Polymethylmethacrylate, be called for short PMMA, English Acrylic), also known as doing acryl or synthetic glass, the number-average molecular weight of its cast panel polymkeric substance is generally 2.2 × 104, and relative density is 1.19 ~ 1.20, and specific refractory power is 1.482 ~ 1.521, hydroscopicity is below 0.5%, and second-order transition temperature is 105 DEG C.Having high-clarity, low price, be easy to the advantages such as mechanical workout, is the glass equivalent material usually often used.The thermal conductivity of PMMA is about 0.2W/m.K, and distance building heat preservation insulation requirement greatly differs from each other, meanwhile, PMMA mechanical strength, shock resistance etc. still have the space that can promote, and (horse accounts for boomerang, methacrylate resin and application thereof, Chemical Industry Press, 2002; Li Lei, Yan Yue, acrylic resin and application thereof, Chemical Industry Press, 2012).
Aerosil is the nano-porous materials of a kind of novel low density, transparent, structure-controllable.With traditional silicon dioxide Particle Phase ratio, aerosil has continuous print tridimensional network, (different silica sources prepares the progress of aerosil to have the constructional features such as low density, high voidage, high-specific surface area, Wang Ni etc., material Leader A: a summary section, 28th volume the 1st phase in 2014,42-45).Have excellent thermal and insulating performance, under normal temperature and pressure, thermal conductivity is extremely low, is the solid material that thermal conductivity known is at present minimum, is with a wide range of applications in the heat insulation field of building heat preservation simultaneously.
Summary of the invention
The object of the present invention is to provide a kind of preparation method of composite material of polymethyl methacrylate of aerosil functionalization, adopt super insulating material aerosil, surface chemistry conditions regulation and control are carried out to it, and itself and acrylamide (AM) and methyl methacrylate (MMA) bulk copolymerization system compound are prepared matrix material, the polymer composites of obtained aerosil functionalization has high printing opacity, the high feature such as heat insulation.
Technical purpose of the present invention is achieved by following technical proposals:
A kind of high printing opacity, high heat-insulation composite material and preparation method thereof, carry out according to following step:
Step 1,80-150 weight part tetraethoxy and 100-170 weight part dehydrated alcohol are mixed at 50-70 DEG C, add after 0.1-1 weight part hydrochloric acid stirs and leave standstill 30-180min, add 0.01-0.2 parts by weight of sodium hydroxide subsequently, be stirred to it to dissolve completely, obtain wet gel by after above-mentioned solution left standstill 2-6h, in wet gel, add 0.1-1 weight part KH550 coupling agent, product is placed in CO
2in supercritical high-pressure extraction device, with CO
2for medium carries out supercritical drying 3h, i.e. functionalized SiO 2 aerogel under temperature 33-50 DEG C and air pressure 7-10MPa;
In described step 1, tetraethoxy and dehydrated alcohol are mixed, stirring velocity is 150-300 turns/min, and churning time is 5-30min;
In described step 1, add 0.1-1 weight part hydrochloric acid and stir, stirring velocity is 150-300 turns/min, and churning time is 5-30min;
In described step 1, described hydrochloric acid is 10-12mol/L hydrochloric acid (i.e. in the aqueous solution of often liter of hydrogenchloride, the amount of substance of hydrogenchloride);
In described step 1, when adding 0.1-1 weight part KH550 coupling agent in wet gel, at 60-70 DEG C, leave standstill 1-3h;
In described step 1, described KH550 coupling agent is 3-aminopropyl triethoxysilane;
Step 2, the functionalized SiO 2 aerogel that 5-10 weight part step (1) obtains is joined ultrasonic disperse in the mixture of 100 parts by weight of methylmethacrylate and 10 parts by weight propylene acid amides even, add the dibenzoyl peroxide of 0.02-0.2 weight part subsequently, after ultrasonic disperse is even, dispersion liquid is placed on kick off temperature and carries out copolymerization with the side vinyl of Methyl Methacrylate, acrylamide and aerosil surface polysiloxane, reaction times is at least 24h, can obtain high printing opacity, high heat-insulation composite material after polymerization;
In described step 2, functionalized SiO 2 aerogel, methyl methacrylate and acrylamide ultrasonic disperse is even, and the ultrasonic disperse time is 1-2h;
In described step 2, the dibenzoyl peroxide ultrasonic disperse adding 0.02-0.2 weight part is even, and the ultrasonic disperse time is 3-10min.
In described step 2, kick off temperature is 70-80 degrees Celsius.
In described step 2, first temperature of reaction is remained on kick off temperature, after polymerization 2h, dispersion liquid is polymerized 24h at 45-50 DEG C, then by dispersion liquid successively at 80 DEG C, 90 DEG C, at 100 DEG C, reacts 2h respectively.
The aerosil using technical scheme of the present invention to prepare has three-dimensional porous reticulated structure, Nanosem430 field emission scanning electron microscope by Dutch Philips observes the SEM photo that obtains of aerosil of preparation as shown in Figure 1, in figure, light field is the three-dimensional porous nano network that silicon-dioxide offspring is piled up, and details in a play not acted out on stage, but told through dialogues is hole.This aerogel visible has higher porosity, the present invention utilizes the equipment of carbon dioxide upercritical fluid extraction, with liquid carbon dioxide, supercritical drying is carried out to hygrometric state gel, namely replace with the solvent of liquid carbon dioxide to hygrometric state gel adsorption, and keep the vesicular structure in gel simultaneously.
Utilize U.S. Nicolet--5DX Fourier transform infrared spectroscopy detected silica aerogel and matrix material, result as shown in Figure 2.Fig. 2 is the infrared spectrogram of each aerogel and matrix material, wherein a is the infrared absorption curve of PMMA mass polymerization, b is the infrared absorption curve of aerosil, c is the infrared absorption curve of P (MMA-co-AM), d is the infrared absorption curve of aerosil without KH550 process and P (MMA-co-AM) matrix material, and e is the infrared absorption curve of matrix material prepared by the present invention.As can be seen from the absorption curve of curve a, MMA mass polymerization at 1731cm
-1there is stronger infrared absorption peak in vicinity, this peak produces due to the stretching vibration of C=O; Curve b is the infrared absorpting light spectra of pure SA, can significantly find at 3435cm from this curve
-1, 1095cm
-1, 1643cm
-1near all there is stronger absorption peak.At 3435cm
-1absorption peak be because the stretching vibration of Si-OH produces, at 1643cm
-1the absorption peak at place causes due to H-O-H flexural vibration effect, and at 1904cm
-1neighbouring absorption peak is formed by the anti-stretching vibration of Si-O-Si; Curve c finds that there is the characteristic peak of AM near 1718cm-1, this is because the C=O in AM there occurs stretching vibration.Hydrogen bond has two important features: the first, occurred the transfer transport of " important " from proton acceptor (Y) to proton donor (X-H); The second, along with the weakening of X-H key is extended, the increase of bond distance and the frequency of X-H stretching vibration reduce, and are therefore called red shift to low-frequency movement.The red shift of X-H stretching vibration can from tens of to hundreds of wavelength not etc., think that the formation of hydrogen bond provides clear and definite information, therefore red shift is considered to a key character of hydrogen bond.In addition, the key closing on hydrogen bond in Y also can die down due to the formation of hydrogen bond, although the red shift of this key can be much little compared with the red shift of X-H stretching vibration, but still can be gone out by infrared measurement, thus demonstrate the existence of hydrogen bond.Experimental result shows, hydrogen bond X-H ... the formation of Y, can make the feature reduction rate (Zhu Huaiwu, organic spectroscopic analysis, Guizhou education publishing house, 1998) frequently of the key of X-H.Reason is the formation of hydrogen bond, and the key of X-H will be made elongated, because this reducing the force constant of key.And the force constant of key reduces, then the characteristic frequency of X-H key can be made to reduce.Correlation curve c and d can find at 3450cm
-1near P (MMA-co-AM) polymkeric substance and all there is absorption peak without the aerosil of KH550 process and P (MMA-co-AM) matrix material, this is due to NH
2the stretching vibration of middle N-H key produces, but in the matrix material obtained in embodiment 2, the peak of this position moves to low field, therefore demonstrates the phase interface defining between aerosil with polymkeric substance and be connected with hydrogen bond.
Nanosem430 field emission scanning electron microscope by Dutch Philips is observed the PMMA based composites section obtained, Fig. 3 is SEM photo, as can be seen from Figure 3, compared with conventional bulk polymerization PMMA material, the matrix material microtexture prepared according to the method for the invention presents random tridimensional network, keep the microscopic appearance of aerogel, hole distribution is comparatively even, aperture is 30-50nm, and there is higher porosity, porosity on average reaches 98-99.5%, the heat-proof quality (Determination of conductive coefficients the results are shown in Table 1) that matrix material keeps higher can be made, to make matrix material of the present invention as the application of heat preserving and insulating material.
With reference to research paper (SilicaAerogel – Poly (ethylene-co-vinylacetate) CompositeforTransparentHeatRetentionFilms, JOURNALOFPOLYMERSCIENCE, PARTB:POLYMERPHYSICS2014,52,927 – 935), adopt U.S. Nicolet--5DX Fourier transform infrared spectroscopy to measure the transmittance of the high transparency height thermal insulating coating being used for immature soil waterproof.Use Xi'an Xiatech Electronic Technology Co., Ltd. TC3000E type thermal conductivity instrument to test the thermal conductivity that each embodiment obtains matrix material, test result is as shown in table 1.The aerosil super insulating material of porous is incorporated in PMMA, the heat-proof quality of matrix material can be improved.Meanwhile, by forming the phase interface that hydrogen bond is connected between aerosil with PMMA, matrix material heat-proof quality and light transmission are increased dramatically, and transmittance on average can reach 97%-99%, and thermal conductivity on average can reach 0.01-0.03W/mK.
By technological approaches of the present invention, using functionalized SiO 2 aerogel as PMMA functionalization phase, heat-proof quality and the visible light transmissivity of PMMA can being promoted, creating conditions to the building heat insulation field of transparent enclosure structural thermal insulation for promoting PMMA.
Accompanying drawing explanation
Fig. 1 is the SEM photo of inventive silica aerogel.
Fig. 2 is the infrared spectrogram of inventive silica aerogel and matrix material.
Fig. 3 is the SEM photo of PMMA matrix material Tensile fracture of the present invention.
Embodiment
Technical scheme of the present invention is further illustrated below in conjunction with specific embodiment, in scheme, reagent and raw material are all purchased from Tianjin Kermel Chemical Reagent Co., Ltd., and what supercritical drying equipment adopted is Haian Oil Scientific Research Apparatus Co., Ltd. CO2 supercritical high-pressure extraction device.
Embodiment 1
(1) by 150g tetraethoxy, 170g dehydrated alcohol mix and blend 30min at 70 DEG C, add 0.1g hydrochloric acid, 180min is left standstill after stirring at room temperature 30min, add 0.01g sodium hydroxide subsequently, be stirred to it to dissolve completely, obtain wet gel by after above-mentioned solution left standstill 6h, in wet gel, add 0.9gKH550 coupling agent, at 60 DEG C, leave standstill 1h, product is placed in CO
2in supercritical high-pressure extraction device, with CO
2for medium carries out supercritical drying 3h under temperature 50 C and air pressure 10MPa, i.e. functionalized SiO 2 aerogel;
(2) the functionalized SiO 2 aerogel that 10g step (1) obtains is joined in 100g methyl methacrylate, then ultrasonic disperse 1h is carried out, add the dibenzoyl peroxide of 0.2g subsequently, ultrasonic disperse 10min, then dispersion liquid is first placed on the bulk copolymerization of Methyl Methacrylate and acrylamide in the water-bath of 75 DEG C, from water-bath, take out the water bath with thermostatic control of putting into 50 DEG C after 2h be polymerized 24h, subsequently by it successively at 80 DEG C, 90 DEG C, respectively place 2h in the water bath with thermostatic control of 100 DEG C, high printing opacity, high heat-insulation composite material can be obtained.
Embodiment 2
(1) by 80g tetraethoxy, 100g dehydrated alcohol mix and blend 5min at 50 DEG C, add 0.1g hydrochloric acid, 30min is left standstill after stirring at room temperature 5min, add 0.01g sodium hydroxide subsequently, be stirred to it to dissolve completely, obtain wet gel by after above-mentioned solution left standstill 2h, in wet gel, add 0.8gKH550 coupling agent, at 65 DEG C, leave standstill 1h, product is placed in CO
2in supercritical high-pressure extraction device, with CO
2for medium carries out supercritical drying 3h, i.e. functionalized SiO 2 aerogel at temperature 35 DEG C and air pressure 7MPa;
(2) the functionalized SiO 2 aerogel that 5g step (1) obtains is joined in 100g methyl methacrylate, then ultrasonic disperse 1h is carried out, add the dibenzoyl peroxide of 0.02g subsequently, ultrasonic disperse 3min, then dispersion liquid is first placed on the bulk copolymerization of Methyl Methacrylate and acrylamide in the water-bath of 75 DEG C, from water-bath, take out the water bath with thermostatic control of putting into 50 DEG C after 2h be polymerized 24h, subsequently by it successively at 80 DEG C, 90 DEG C, respectively place 2h in the water bath with thermostatic control of 100 DEG C, high printing opacity, high heat-insulation composite material can be obtained.
Embodiment 3
(1) by 96g tetraethoxy, 145g dehydrated alcohol mix and blend 24min at 65 DEG C, add 0.5g hydrochloric acid, 87min is left standstill after stirring at room temperature 12min, add 0.13g sodium hydroxide subsequently, be stirred to it to dissolve completely, obtain wet gel by after above-mentioned solution left standstill 5h, in wet gel, add 0.5gKH550 coupling agent, at 68 DEG C, leave standstill 1h, product is placed in CO
2in supercritical high-pressure extraction device, with CO
2for medium carries out supercritical drying 3h, i.e. functionalized SiO 2 aerogel at temperature 44 DEG C and air pressure 9MPa;
(2) the functionalized SiO 2 aerogel that 7g step (1) obtains is joined in 100g methyl methacrylate, then ultrasonic disperse 1h is carried out, add the dibenzoyl peroxide of 0.14g subsequently, ultrasonic disperse 4.8min, then dispersion liquid is first placed on the bulk copolymerization of Methyl Methacrylate and acrylamide in the water-bath of 75 DEG C, from water-bath, take out the water bath with thermostatic control of putting into 50 DEG C after 2h be polymerized 24h, subsequently by it successively at 80 DEG C, 90 DEG C, respectively place 2h in the water bath with thermostatic control of 100 DEG C, high printing opacity, high heat-insulation composite material can be obtained.
Embodiment 4
(1) by 113g tetraethoxy, 156g dehydrated alcohol mix and blend 27min at 64 DEG C, add 0.34g hydrochloric acid, 76min is left standstill after stirring at room temperature 25min, add 0.04g sodium hydroxide subsequently, be stirred to it to dissolve completely, obtain wet gel by after above-mentioned solution left standstill 5h, in wet gel, add 0.1gKH550 coupling agent, at 69 DEG C, leave standstill 1h, product is placed in CO
2in supercritical high-pressure extraction device, with CO
2for medium carries out supercritical drying 3h under temperature 50 C and air pressure 8MPa, i.e. functionalized SiO 2 aerogel;
(2) the functionalized SiO 2 aerogel that 9g step (1) obtains is joined in 100g methyl methacrylate, then ultrasonic disperse 1h is carried out, add the dibenzoyl peroxide of 0.14g subsequently, ultrasonic disperse 9min, then dispersion liquid is first placed on the bulk copolymerization of Methyl Methacrylate and acrylamide in the water-bath of 75 DEG C, from water-bath, take out the water bath with thermostatic control of putting into 50 DEG C after 2h be polymerized 24h, subsequently by it successively at 80 DEG C, 90 DEG C, respectively place 2h in the water bath with thermostatic control of 100 DEG C, high printing opacity, high heat-insulation composite material can be obtained.
Embodiment 5
(1) by 145g tetraethoxy, 148g dehydrated alcohol mix and blend 27min at 50-70 DEG C, add 0.3g hydrochloric acid, 154min is left standstill after stirring at room temperature 22min, add 0.16g sodium hydroxide subsequently, be stirred to it to dissolve completely, obtain wet gel by after above-mentioned solution left standstill 5.5h, in wet gel, add 1gKH550 coupling agent, at 65 DEG C, leave standstill 1h, product is placed in CO
2in supercritical high-pressure extraction device, with CO
2for medium carries out supercritical drying 3h, i.e. functionalized SiO 2 aerogel at temperature 33 DEG C and air pressure 7.1MPa;
(2) the functionalized SiO 2 aerogel that 9.1g step (1) obtains is joined in 100g methyl methacrylate, then ultrasonic disperse 1h is carried out, add the dibenzoyl peroxide of 0.19g subsequently, ultrasonic disperse 6min, then dispersion liquid is first placed on the bulk copolymerization of Methyl Methacrylate and acrylamide in the water-bath of 75 DEG C, from water-bath, take out the water bath with thermostatic control of putting into 50 DEG C after 2h be polymerized 24h, subsequently by it successively at 80 DEG C, 90 DEG C, respectively place 2h in the water bath with thermostatic control of 100 DEG C, high printing opacity, high heat-insulation composite material can be obtained.
The performance of table 1 composite material of polymethyl methacrylate
| Embodiment | Transmittance (%) | Thermal conductivity (W/mK) |
| 1 | 98.45 | 0.027 |
| 2 | 98.84 | 0.028 |
| 3 | 97.26 | 0.022 |
| 4 | 98.42 | 0.019 |
| 5 | 97.89 | 0.017 |
According to the technical scheme of content of the present invention, in adjustment preparation process, corresponding processing parameter carries out the preparation of differing materials, and the material of final preparation, reveals identical character with material base table prepared by above-described embodiment.
Above to invention has been exemplary description; should be noted that; when not departing from core of the present invention, any simple distortion, amendment or other those skilled in the art can not spend the equivalent replacement of creative work all to fall into protection scope of the present invention.
Claims (10)
1. high printing opacity, a high heat-insulation composite material, it is characterized in that, porosity reaches 98-99.5%, even aperture distribution, and at 30-50nm, transmittance is 97%-99%, and thermal conductivity is 0.01-0.03W/mK, carries out according to following step:
Step 1,80-150 weight part tetraethoxy and 100-170 weight part dehydrated alcohol are mixed at 50-70 DEG C, add after 0.1-1 weight part hydrochloric acid stirs and leave standstill 30-180min, add 0.01-0.2 parts by weight of sodium hydroxide subsequently, be stirred to it to dissolve completely, obtain wet gel by after above-mentioned solution left standstill 2-6h, in wet gel, add 0.1-1 weight part KH550 coupling agent, product is placed in CO
2in supercritical high-pressure extraction device, with CO
2for medium carries out supercritical drying 3h, i.e. functionalized SiO 2 aerogel under temperature 33-50 DEG C and air pressure 7-10MPa;
In described step 1, described KH550 coupling agent is 3-aminopropyl triethoxysilane;
Step 2, the functionalized SiO 2 aerogel that 5-10 weight part step (1) obtains is joined ultrasonic disperse in the mixture of 100 parts by weight of methylmethacrylate and 10 parts by weight propylene acid amides even, add the dibenzoyl peroxide of 0.02-0.2 weight part subsequently, after ultrasonic disperse is even, dispersion liquid is placed on kick off temperature and carries out copolymerization with the side vinyl of Methyl Methacrylate, acrylamide and aerosil surface polysiloxane, reaction times is at least 24h, can obtain high printing opacity, high heat-insulation composite material after polymerization.
2. the high printing opacity of one according to claim 1, high heat-insulation composite material, it is characterized in that, in described step 1, tetraethoxy and dehydrated alcohol are mixed, stirring velocity is 150-300 turns/min, churning time is 5-30min, add 0.1-1 weight part hydrochloric acid to stir, stirring velocity is 150-300 turns/min, and churning time is 5-30min, described hydrochloric acid is 10-12mol/L hydrochloric acid (i.e. in the aqueous solution of often liter of hydrogenchloride, the amount of substance of hydrogenchloride).
3. the high printing opacity of one according to claim 1, high heat-insulation composite material, is characterized in that, in described step 1, when adding 0.1-1 weight part KH550 coupling agent in wet gel, at 60-70 DEG C, leaves standstill 1-3h.
4. the high printing opacity of one according to claim 1, high heat-insulation composite material, it is characterized in that, in described step 2, by even to functionalized SiO 2 aerogel, methyl methacrylate and acrylamide ultrasonic disperse, the ultrasonic disperse time is 1-2h, the dibenzoyl peroxide ultrasonic disperse adding 0.02-0.2 weight part is even, and the ultrasonic disperse time is 3-10min.
5. the high printing opacity of one according to claim 1, high heat-insulation composite material, it is characterized in that, in described step 2, first temperature of reaction is remained on kick off temperature, kick off temperature is 70-80 degrees Celsius, after polymerization 2h, dispersion liquid is polymerized 24h at 45-50 DEG C, again by dispersion liquid successively at 80 DEG C, 90 DEG C, at 100 DEG C, react 2h respectively.
6. a preparation method for high printing opacity, high heat-insulation composite material, is characterized in that, carries out according to following step:
Step 1,80-150 weight part tetraethoxy and 100-170 weight part dehydrated alcohol are mixed at 50-70 DEG C, add after 0.1-1 weight part hydrochloric acid stirs and leave standstill 30-180min, add 0.01-0.2 parts by weight of sodium hydroxide subsequently, be stirred to it to dissolve completely, obtain wet gel by after above-mentioned solution left standstill 2-6h, in wet gel, add 0.1-1 weight part KH550 coupling agent, product is placed in CO
2in supercritical high-pressure extraction device, with CO
2for medium carries out supercritical drying 3h, i.e. functionalized SiO 2 aerogel under temperature 33-50 DEG C and air pressure 7-10MPa;
In described step 1, described KH550 coupling agent is 3-aminopropyl triethoxysilane;
Step 2, the functionalized SiO 2 aerogel that 5-10 weight part step (1) obtains is joined ultrasonic disperse in the mixture of 100 parts by weight of methylmethacrylate and 10 parts by weight propylene acid amides even, add the dibenzoyl peroxide of 0.02-0.2 weight part subsequently, after ultrasonic disperse is even, dispersion liquid is placed on kick off temperature and carries out copolymerization with the side vinyl of Methyl Methacrylate, acrylamide and aerosil surface polysiloxane, reaction times is at least 24h, can obtain high printing opacity, high heat-insulation composite material after polymerization.
7. the preparation method of a kind of high printing opacity according to claim 6, high heat-insulation composite material, it is characterized in that, in described step 1, tetraethoxy and dehydrated alcohol are mixed, stirring velocity is 150-300 turns/min, churning time is 5-30min, add 0.1-1 weight part hydrochloric acid to stir, stirring velocity is 150-300 turns/min, churning time is 5-30min, described hydrochloric acid is 10-12mol/L hydrochloric acid (i.e. in the aqueous solution of often liter of hydrogenchloride, the amount of substance of hydrogenchloride).
8. the preparation method of a kind of high printing opacity according to claim 6, high heat-insulation composite material, is characterized in that, in described step 1, when adding 0.1-1 weight part KH550 coupling agent in wet gel, at 60-70 DEG C, leaves standstill 1-3h.
9. the preparation method of a kind of high printing opacity according to claim 6, high heat-insulation composite material, it is characterized in that, in described step 2, by even to functionalized SiO 2 aerogel, methyl methacrylate and acrylamide ultrasonic disperse, the ultrasonic disperse time is 1-2h, the dibenzoyl peroxide ultrasonic disperse adding 0.02-0.2 weight part is even, and the ultrasonic disperse time is 3-10min.
10. the preparation method of a kind of high printing opacity according to claim 5, high heat-insulation composite material, it is characterized in that, in described step 2, first temperature of reaction is remained on kick off temperature, kick off temperature is 70-80 degrees Celsius, after polymerization 2h, dispersion liquid is polymerized 24h at 45-50 DEG C, again by dispersion liquid successively at 80 DEG C, 90 DEG C, at 100 DEG C, react 2h respectively.
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| US11851334B2 (en) | 2016-02-24 | 2023-12-26 | Massachusetts Institute Of Technology | Solar thermal aerogel receiver and materials therefor |
| US11170750B2 (en) | 2018-04-25 | 2021-11-09 | Massachusetts Institute Of Technology | Energy efficient soundproofing window retrofits |
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| CN112795122A (en) * | 2020-12-30 | 2021-05-14 | 中国建筑材料科学研究总院有限公司 | Nano powder-based heat insulation material and preparation method thereof |
| CN114534693A (en) * | 2022-02-18 | 2022-05-27 | 南京工业大学 | Preparation method of transparent hydrophobic spherical silica aerogel adsorbent |
| CN114534693B (en) * | 2022-02-18 | 2024-05-10 | 南京工业大学 | Preparation method of transparent hydrophobic spherical silica aerogel adsorbent |
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