CN111777373A - Formaldehyde-reducing thermal-insulation mortar for inner side wall of outer wall and preparation method thereof - Google Patents

Formaldehyde-reducing thermal-insulation mortar for inner side wall of outer wall and preparation method thereof Download PDF

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CN111777373A
CN111777373A CN202010464477.0A CN202010464477A CN111777373A CN 111777373 A CN111777373 A CN 111777373A CN 202010464477 A CN202010464477 A CN 202010464477A CN 111777373 A CN111777373 A CN 111777373A
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formaldehyde
activated carbon
carbon fiber
solution
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陆尚文
张青云
李梅
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Hubao Energy Saving Technology Engineering Shanghai Co ltd
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Hubao Energy Saving Technology Engineering Shanghai Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/04—Portland cements
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00017—Aspects relating to the protection of the environment
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00025—Aspects relating to the protection of the health, e.g. materials containing special additives to afford skin protection
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00482—Coating or impregnation materials
    • C04B2111/00508—Cement paints
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/0081—Uses not provided for elsewhere in C04B2111/00 as catalysts or catalyst carriers
    • C04B2111/00827—Photocatalysts
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
    • C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Abstract

The invention relates to the technical field of heat insulation materials for buildings, and particularly discloses formaldehyde-reducing heat insulation mortar for an inner side wall of an outer wall, which is prepared from the following raw materials in parts by weight: 30-47 parts of Portland cement, 10-20 parts of vitrified micro bubbles and Fe-TiO21-10 parts of activated carbon fiber, 3-8 parts of latex powder, 1-5 parts of polypropylene fiber, 1-5 parts of wood fiber, 5-10 parts of diatomite and 30-40 parts of deionized water; the formaldehyde-reducing thermal insulation mortar for the inner side wall of the outer wall has the advantages that indoor formaldehyde can be adsorbed and degraded; also provides a preparation method of the formaldehyde-reducing thermal insulation mortar for the inner side wall of the outer wall.

Description

Formaldehyde-reducing thermal-insulation mortar for inner side wall of outer wall and preparation method thereof
Technical Field
The invention relates to the technical field of heat insulation materials for buildings, in particular to formaldehyde-reducing heat insulation mortar for an outer wall inner side wall and a preparation method thereof.
Background
In modern life, formaldehyde released from interior materials has become one of the main pollutants in indoor air. Artificial wooden floors such as plywood, medium density fiberboard, plywood and composite floor used for decoration are bonded by urea-formaldehyde resin or phenolic resin. The resins contain free formaldehyde, the formaldehyde belongs to volatile organic compounds, and the formaldehyde can be released into the air at normal temperature after decoration, so that the health of people is threatened.
Research shows that the photocatalysis of titanium dioxide can oxidize formaldehyde to generate carbon dioxide and water. However, titanium dioxide needs to be irradiated by ultraviolet light, so that the photocatalytic efficiency is high, and the photocatalytic efficiency is low under sunlight. The catalytic efficiency of titanium dioxide to formaldehyde under common sunlight can be improved by doping metal atoms.
The heat-insulating mortar is prepared by mixing various light materials as aggregate, cement as a cementing material and some modified additives, and stirring and mixing the materials by a production enterprise. The thermal insulation mortar is mainly used for thermal insulation of inner and outer walls of buildings, and has the advantages of convenience in construction, good durability and the like.
In the prior art, heat-insulating mortar capable of reducing the concentration of indoor formaldehyde is available. For example, chinese patent publication No. CN107352872B discloses a high-strength environment-friendly thermal insulation mortar containing diatom sand beads, wherein the thermal insulation mortar comprises the following components: 50-60% of diatomite beads, 10-20% of diatom powder, 5-8% of environment-friendly latex powder, 10-20% of cement, 1% of wood fiber, 2% of cellulose and 0-10% of vitrified micro bubbles.
By the formula, the formaldehyde in the room can be adsorbed, and the concentration of the formaldehyde in the room is reduced by adsorbing the formaldehyde in the room. However, the above formulation has the following drawbacks: firstly, after formaldehyde is adsorbed in the thermal insulation mortar, when the temperature is high, the formaldehyde can be released into the indoor air again, which is not beneficial to the long-term health of people; the second step is as follows: the adsorption capacity of the thermal insulation mortar is limited, and the thermal insulation mortar can not be adsorbed when the adsorption capacity reaches a certain amount.
Disclosure of Invention
Aiming at the defects in the prior art, the first purpose of the invention is to provide the formaldehyde-reducing thermal insulation mortar for the inner side wall of the outer wall, which has the advantages of being capable of adsorbing and degrading indoor formaldehyde.
The second purpose of the invention is to provide a preparation method of the formaldehyde-reducing thermal insulation mortar for the inner side wall of the outer wall.
In order to achieve the first object, the invention provides the following technical scheme:
the formaldehyde-reducing thermal insulation mortar for the inner side wall of the outer wall is prepared from the following raw materials in parts by weight: 30-47 parts of Portland cement, 10-20 parts of vitrified micro bubbles and Fe-TiO21-10 parts of activated carbon fiber, 3-8 parts of latex powder, 1-5 parts of polypropylene fiber, 1-5 parts of wood fiber, 5-10 parts of diatomite and 30-40 parts of deionized water.
By adopting the technical scheme, the TiO is treated2Doping of metal atom Fe to TiO2Is modified to makeTiO2The photocatalytic activity of the material is red-shifted, the degradation of formaldehyde can be realized under visible light, and Fe-TiO is added2Loaded on the surface of the activated carbon fiber, the activated carbon fiber has stronger adsorption effect on formaldehyde, and after the activated carbon fiber adsorbs the formaldehyde, Fe-TiO on the surface of the activated carbon fiber2The formaldehyde is degraded under visible light, namely sunlight, so that the aim of reducing the concentration of the formaldehyde is fulfilled.
Preferably 35-47 parts of Portland cement, 13-17 parts of vitrified micro-beads and Fe-TiO25-7 parts of activated carbon fiber, 5-6 parts of latex powder, 3-4 parts of polypropylene fiber, 3-4 parts of wood fiber, 5-8 parts of diatomite and 32-36 parts of deionized water.
By adopting the technical scheme, the added Fe-TiO2When the active carbon fiber is 5-7 parts, the effect of the thermal insulation mortar on formaldehyde adsorption and degradation is good; added Fe-TiO2When the activated carbon fiber is less, the effect of the thermal insulation mortar on formaldehyde adsorption and degradation is not ideal; added Fe-TiO2When the number of the activated carbon fibers is large, the effect of the thermal insulation mortar on formaldehyde adsorption and degradation is increased to a small extent, but the cost is increased to a large extent.
Preferably, the Fe-TiO2-the activated carbon fiber is prepared by the following steps:
1) HNO with the concentration of 2-4mol/L3Adding Fe (NO) into the solution3)3Solid, and stirring to dissolve to obtain solution A, HNO3HNO in solution3Molar amount of Fe (NO)3)310-15 times of the molar weight of (A);
2) deionized water is used as a solvent to prepare tetrabutyl titanate solution with the concentration of 2-5 mol/L;
3) dropwise adding the tetrabutyl titanate solution obtained in the step 2) into the solution A obtained in the step 1), stirring while dropwise adding, wherein the molar quantity of tetrabutyl titanate in the tetrabutyl titanate solution is Fe (NO)3)31-5% of molar weight, and continuously reacting for 4-6 hours after the dropwise addition is finished to obtain a mixed solution A;
4) adding activated carbon fiber into the mixed solution A while stirring, wherein the mass of the activated carbon fiber is 5-10 times of that of tetrabutyl titanate in the tetrabutyl titanate solution dropwise added in the step 3), and reacting for 4-6h after the dropwise addition is finished to obtain mixed solution B;
5) carrying out centrifugal separation on the mixed solution B to obtain a precipitate A, washing the precipitate A, and roasting the precipitate A for 2-3h in a nitrogen atmosphere at the temperature of 450-600 ℃ to obtain Fe-TiO2-activated carbon fibres.
By adopting the technical scheme, Fe-TiO can be obtained2Activated carbon fibres and in the preparation of TiO2Adding iron atoms in the step of crystal is beneficial to the uniformity of the iron atoms loaded on the surface of titanium dioxide, and then adding activated carbon fiber to ensure that Fe-TiO can be used2Are uniformly distributed on the surface of the activated carbon fiber.
Preferably, the reaction temperature of the step 3) is 40-60 ℃.
By adopting the technical scheme, when the temperature is lower, the reaction is slower, and when the temperature is overhigh, the HNO is enabled3Too fast decomposition is not favorable for maintaining the pH of the solution.
Preferably, the centrifugal rotation speed in the step 5) is 3500-6000r/min, and the centrifugal time is 3-5 min.
Through adopting above-mentioned technical scheme, the centrifugation rotational speed is crossed low excessively, can make the sediment incomplete, and the centrifugation rotational speed is too high, is difficult for dispersing when making sediment later stage washing.
Preferably, the activated carbon fiber is pretreated in the step 4) as follows:
soaking the activated carbon fiber in ethanol for 1h, taking out the activated carbon fiber, soaking in distilled water for 1h, taking out the activated carbon fiber, and drying.
By adopting the technical scheme, the impurities on the surface of the activated carbon fiber can be dissolved and removed by pretreating the activated carbon fiber, so that the Fe-TiO on the surface of the activated carbon fiber2The load factor is increased.
The second purpose of the invention is realized by the following technical scheme: a preparation method of formaldehyde-reducing thermal insulation mortar for the inner side wall of an outer wall comprises the following preparation steps:
1) adding into deionized waterFe-TiO2Activated carbon fiber, latex powder, polypropylene fiber, wood fiber and the like are uniformly stirred to obtain a mixed solution C;
2) and adding the Portland cement and the vitrified micro bubbles into the mixed solution C, and uniformly stirring to obtain the formaldehyde-reducing thermal insulation mortar for the inner side wall of the outer wall.
By adopting the technical scheme, firstly, the Fe-TiO is sequentially added into the deionized water2The raw materials with less quantity of the activated carbon fiber, the latex powder, the polypropylene fiber and the wood fiber are uniformly stirred, and then the Portland cement and the vitrified micro bubbles are added for uniform stirring, thereby being beneficial to the rapid uniform mixing of the thermal insulation mortar.
In conclusion, the invention has the following beneficial effects:
(1) the invention is on Fe-TiO2When the addition amount of the activated carbon fiber reaches 4.5%, the adsorption degradation of the corresponding thermal insulation mortar to formaldehyde reaches 87.9% in 24 hours, the concentration of formaldehyde is greatly reduced, and compared with the simple reduction of the concentration of formaldehyde through adsorption, the concentration of formaldehyde can be reduced through degradation, so that the formaldehyde is not released indoors again due to temperature rise in the later period, and the long-term health of people is facilitated.
(2) In the preparation of TiO2Adding iron atoms in the step of crystal is beneficial to the uniformity of the iron atoms loaded on the surface of titanium dioxide, and then adding activated carbon fiber to ensure that Fe-TiO can be used2Are uniformly distributed on the surface of the activated carbon fiber.
Detailed Description
The present invention will be described in further detail with reference to examples.
Raw materials
The portland cement in the invention is selected from corridor Longchen energy-saving science and technology limited; the vitrified micro bubbles adopt 70-90 meshes of vitrified micro bubbles and are selected from Xinyang city Xinjun industry Co., Ltd; the latex powder is selected from Hebei Shenpeng chemical company; the wood fiber is selected from great fire-resistant heat-insulating material limited company; the diatomite is selected from Shijiazhuang Hualang mineral product trade company, and the model is 325 meshes; the polypropylene fiber is selected from Hunan pioneer building materials Co., Ltd, and the elastic modulus is more than 3500 MPa; the activated carbon fiber is selected from environmental protection limited of Jinanju Yi Ji Shi.
Preparation example 1
Fe-TiO2-the activated carbon fiber is prepared by the following steps:
1) at a concentration of 2mol/L HNO3Adding Fe (NO) into the solution3)3Solid, and stirring to dissolve to obtain solution A, HNO3HNO in solution3Molar amount of Fe (NO)3)310 times the molar amount of (c);
2) deionized water is used as a solvent to prepare tetrabutyl titanate solution with the concentration of 2 mol/L;
3) dropwise adding the tetrabutyl titanate solution obtained in the step 2) into the solution A obtained in the step 1), stirring while dropwise adding, wherein the molar quantity of tetrabutyl titanate in the tetrabutyl titanate solution is Fe (NO)3)3After dropwise adding 1% of the molar weight, continuously reacting for 4 hours to obtain a mixed solution A, wherein the reaction temperature is 45 ℃;
4) adding activated carbon fiber into the mixed solution A while stirring, wherein the mass of the activated carbon fiber is 5 times of that of tetrabutyl titanate in the tetrabutyl titanate solution dropwise added in the step 3), and reacting for 4 hours after the dropwise addition is finished to obtain mixed solution B;
5) centrifuging the mixed solution B at 3500r/min for 5min to obtain precipitate A, and roasting the precipitate A at 450 deg.C in nitrogen atmosphere for 3h to obtain Fe-TiO2-activated carbon fibres.
Preparation example 2
Fe-TiO2-the activated carbon fiber is prepared by the following steps:
1) at a concentration of 3mol/L HNO3Adding Fe (NO) into the solution3)3Solid, and stirring to dissolve to obtain solution A, HNO3The molar weight of HNO3 in the solution is Fe (NO)3)312.5 times the molar amount of (c);
2) deionized water is used as a solvent to prepare tetrabutyl titanate solution with the concentration of 4 mol/L;
3) dropwise adding the tetrabutyl titanate solution obtained in the step 2) into the solution A obtained in the step 1), stirring while dropwise adding, wherein the molar quantity of tetrabutyl titanate in the tetrabutyl titanate solution is Fe (NO)3)3After the dropwise addition of 3 percent of the molar weight is finished, continuously reacting for 5 hours to obtain a mixed solution A, wherein the reaction temperature is 55 ℃;
4) adding activated carbon fiber into the mixed solution A while stirring, wherein the mass of the activated carbon fiber is 7 times of that of tetrabutyl titanate in the tetrabutyl titanate solution dropwise added in the step 3), and reacting for 6 hours after the dropwise addition is finished to obtain mixed solution B;
5) centrifuging the mixed solution B for 4min at the rotating speed of 5000r/min to obtain a precipitate A, washing the precipitate A, and roasting the precipitate A for 2h at the temperature of 500 ℃ in a nitrogen atmosphere to obtain Fe-TiO2-activated carbon fibres.
Preparation example 3
Fe-TiO2-the activated carbon fiber is prepared by the following steps:
1) HNO at a concentration of 4mol/L3Adding Fe (NO) into the solution3)3Solid, and stirring to dissolve to obtain solution A, HNO3HNO in solution3Molar amount of Fe (NO)3)315 times the molar amount of (c);
2) deionized water is used as a solvent to prepare tetrabutyl titanate solution with the concentration of 5 mol/L;
3) dropwise adding the tetrabutyl titanate solution obtained in the step 2) into the solution A obtained in the step 1), stirring while dropwise adding, wherein the molar quantity of tetrabutyl titanate in the tetrabutyl titanate solution is Fe (NO)3)3After 5 percent of the molar weight is added dropwise, continuously reacting for 6 hours to obtain a mixed solution A, wherein the reaction temperature is 60 ℃;
4) adding activated carbon fiber into the mixed solution A while stirring, wherein the mass of the activated carbon fiber is 10 times of that of tetrabutyl titanate in the tetrabutyl titanate solution dropwise added in the step 3), and reacting for 5 hours after the dropwise addition is finished to obtain mixed solution B;
5) centrifuging the mixed solution B at 6000r/min for 3min to obtain precipitate A, washing the precipitate A, and roasting the precipitate A in nitrogen atmosphere at 600 deg.C for 2h to obtain Fe-TiO2-activated carbon fibres.
Preparation example 4
Fe-TiO2The preparation method comprises the following steps:
1) at a concentration of 3mol/L HNO3Adding Fe (NO) into the solution3)3Solid, and stirring to dissolve to obtain solution A, HNO3HNO in solution3Molar amount of Fe (NO)3)312.5 times the molar amount of (c);
2) deionized water is used as a solvent to prepare tetrabutyl titanate solution with the concentration of 4 mol/L;
3) dropwise adding the tetrabutyl titanate solution obtained in the step 2) into the solution A obtained in the step 1), stirring while dropwise adding, wherein the molar quantity of tetrabutyl titanate in the tetrabutyl titanate solution is Fe (NO)3)3After the dropwise addition of 2.5 percent of the molar weight is finished, continuously reacting for 5 hours to obtain a mixed solution A;
3) centrifuging the mixed solution A at 6000r/min for 5min, collecting precipitate, and roasting at 500 deg.C for 2.5 h.
The activated carbon fiber is pretreated as follows:
soaking the activated carbon fiber in ethanol for 1h, taking out the activated carbon fiber, soaking in distilled water for 1h, taking out the activated carbon fiber, and drying.
Example 1
The formaldehyde-reducing thermal insulation mortar for the inner side wall of the outer wall in the embodiment 1 has the following components in percentage by weight as shown in Table 1, and the processing operation specifically comprises the following steps:
1) adding Fe-TiO into deionized water2Activated carbon fiber, latex powder, polypropylene fiber, wood fiber and the like are stirred for 2 hours to obtain mixed liquor C, wherein Fe-TiO2Activated carbon fiber Fe-TiO obtained in preparation example 12-activated carbon fibres;
2) and adding the Portland cement and the vitrified micro bubbles into the mixed solution C, and stirring for 1h to obtain the formaldehyde-reducing thermal insulation mortar for the inner side wall of the outer wall.
TABLE 1 composition and content of raw materials of formaldehyde-reducing thermal insulation mortar for inner side wall of outer wall
Figure BDA0002512134230000061
Example 2
The formaldehyde-reducing thermal insulation mortar for the inner side wall of the outer wall in example 2 has the components shown in Table 1, wherein Fe-TiO2Activated carbon fiber Fe-TiO obtained in preparation example 22-activated carbon fibres. The processing procedure was the same as in example 1.
Example 3
The formaldehyde-reducing thermal insulation mortar for the inner side wall of the outer wall in example 3 has the components in the contents shown in Table 1, wherein Fe-TiO2Activated carbon fiber Fe-TiO obtained in preparation example 32-activated carbon fibres. The processing procedure was the same as in example 1.
Example 4
The formaldehyde-reducing thermal insulation mortar for the inner side wall of the outer wall in example 3 has the components in the contents shown in Table 1, wherein Fe-TiO2Activated carbon fiber Fe-TiO obtained in preparation example 22-activated carbon fibres. The processing procedure was the same as in example 1.
Example 5
The formaldehyde-reducing thermal insulation mortar for the inner side wall of the outer wall in example 3 has the components in the contents shown in Table 1, wherein Fe-TiO2Activated carbon fiber Fe-TiO obtained in preparation example 32-activated carbon fibres. The processing procedure was the same as in example 1.
Examples 6 to 9
The formaldehyde-reducing thermal mortar for the inner side walls of the exterior walls of examples 6 to 9 has the following components in the amounts shown in Table 1, wherein Fe-TiO2Activated carbon fiber Fe-TiO obtained in preparation example 22Activated carbon fibers, the processing steps of which are the same as those of example 1.
Comparative example 1
The content of each component of the exterior wall inner side wall formaldehyde-reducing thermal insulation mortar of the comparative example 1 is shown in the example 4, and the difference from the example 4 is that Fe-TiO is used2-replacing activated carbon fiber with Fe-TiO2Added Fe-TiO2Amount of active ingredient of activated carbon fiber and Fe-TiO2The same amount, the same working procedure as in example 1 was followed for comparative example 1.
Comparative example 2
Exterior wall interior of comparative example 2The side wall formaldehyde-reducing thermal insulation mortar is shown as example 4, and is different from example 4 in that Fe-TiO is added2Replacing the activated carbon fiber with activated carbon fiber, the amount of activated carbon fiber added and Fe-TiO2The same amount of activated carbon fibers as in the activated carbon fibers, and the same processing procedure as in example 1 was carried out in comparative example 2.
Comparative example 3
The content of each component of the exterior wall inner side wall formaldehyde-reducing thermal insulation mortar of the comparative example 3 is shown in the example 4, and the difference from the example 4 is that Fe-TiO2The amount of activated carbon fiber added was 0, and the procedure of comparative example 3 was the same as in example 1.
Comparative example 4
The high-strength environment-friendly thermal insulation mortar containing the diatom ooze beads in the embodiment 2 of the Chinese invention patent with the publication number of CN 107352872B.
Performance test
The exterior wall inner side wall formaldehyde-reducing thermal insulation mortars in the examples 1-9 and the comparative examples 1-4 are respectively extracted, the quality of the thermal insulation mortar is detected according to GB/T20473-2006 building thermal insulation mortar, and the specific results are shown in Table 2.
Wherein, when the bulk density is less than 350kg/m3, the product is qualified; the compressive strength is qualified when being more than 0.40 MPa; when the heat conductivity coefficient is less than 0.085, the product is qualified; when the softening coefficient is more than 0.50, the product is qualified.
Table 2 test results of formaldehyde-reducing thermal insulation mortar for inner walls of exterior walls in examples 1 to 9 and comparative examples 1 to 4
Figure BDA0002512134230000071
As can be seen from the data in Table 2, the bulk density, compressive strength, thermal conductivity coefficient, softening coefficient and the like of the formaldehyde-reducing thermal insulation mortar for the inner side wall of the outer wall are all qualified.
As can be seen from examples 1 to 9 and comparative examples 1 to 3, Fe-TiO was added separately2-activated carbon fiber, Fe-TiO2And activated carbon fiber for reducing the bulk density and resisting the formaldehyde of the heat-insulating mortar on the inner side wall of the outer wallThe compressive strength, thermal conductivity, softening coefficient, etc. do not have significant effects.
Formaldehyde adsorption degradation test
And (3) test treatment: the formaldehyde-reducing thermal insulation mortar for the inner side walls of the outer walls of the examples 1 to 9 and the comparative examples 1 to 4 is uniformly coated on the inner wall of a reaction chamber, the reaction chamber is a cubic small chamber made of transparent rigid plastics, the volume of the reaction chamber is 100L, one small door can be opened, the air tightness of the small door is good after the small door is closed, and the thermal insulation mortar is coated and then dried for 10 hours at 35 ℃.
Adsorption experiment: the reaction chamber is filled with a solution with the concentration of 1.5mg/m3Standing the formaldehyde gas for 24 hours without being irradiated by a fluorescent lamp, namely under a dark condition, and then sampling and detecting the concentration of formaldehyde in the reaction cabin by a formaldehyde analyzer;
wherein the adsorption rate is (C)Initial-CAfter standing still)/CInitial
CInitialIs the initial concentration of formaldehyde; cAfter standing stillThe concentration of formaldehyde is after standing and being adsorbed.
Degradation experiments: standing for 24 hours in the reaction cabin after the adsorption experiment is finished under the condition of irradiation of a fluorescent lamp, and then sampling and detecting the concentration of formaldehyde in the reaction cabin through a formaldehyde analyzer;
wherein the degradation rate is (C)After standing still-CAfter the reaction)/CAfter standing stillAdsorption Rate
CAfter the reactionThe concentration of formaldehyde is obtained after 24 hours of catalytic reaction under the irradiation of a fluorescent lamp.
Formaldehyde removal rate ═ CInitial-CFinally, the product is processed)/CInitial
Wherein, CFinally, the product is processedThe concentration of formaldehyde after the degradation experiment in the reaction chamber is completed.
TABLE 3 Formaldehyde adsorption degradation test result of exterior wall inside wall formaldehyde-reducing thermal insulation mortar
Adsorption Rate (%) Degradation Rate (%) Formaldehyde removal rate (%)
Example 1 12.7 46.0 58.7
Example 2 15.2 53.9 69.1
Example 3 18.3 69.9 88.2
Example 4 19.2 70.9 90.1
Example 5 19.8 71.2 91.0
Example 6 12.5 46.5 59.0
Example 7 15.3 53.6 68.9
Example 8 18.2 69.7 87.9
Example 9 20.0 71.3 91.3
Comparative example 1 6.9 30.8 37.7
Comparative example 2 20.2 0.1 20.3
Comparative example 3 6.7 0.1 6.8
Comparative example 4 10.3 0.1 10.4
As can be seen from the data in Table 3, the formaldehyde adsorption rate and the degradation rate of the exterior wall inner side wall formaldehyde-reducing thermal insulation mortar (examples 1-9) are higher than those of the thermal insulation mortar in the comparative example 4. The heat-insulating mortar has higher formaldehyde adsorption rate and degradation rate, so that the formaldehyde removal rate in the reaction cabin is obviously improved.
As can be seen from examples 1 to 5 and comparative example 3, Fe-TiO prepared in preparation examples 1 to 32The activated carbon fiber has obvious adsorption and degradation effects on formaldehyde, so that the formaldehyde in the reaction cabin is obviously reduced.
As can be seen from examples 4 and 6 to 9, the Fe-TiO content in the mortar is dependent on the temperature2The increase of the addition amount of the activated carbon fiber shows an upward trend of the adsorption and degradation of formaldehyde by the corresponding thermal mortar, but when the addition amount reaches 4.5%, the rising amplitude of the activated carbon fiber is reduced.
As can be seen from the data of example 4 and comparative examples 1-3, Fe-TiO alone was added2The removal rate of the activated carbon fiber and the formaldehyde is limited and is obviously lower than that of the added Fe-TiO2-thermal insulation mortar of activated carbon fibers. Analysis of Fe-TiO2Although formaldehyde has better degradation effect under sunlight, the formaldehyde has poor adsorption and degradation capability due to the small contact area with the formaldehyde. The activated carbon fiber can absorb formaldehyde, but the absorption capacity is limited, so that the removal rate of the formaldehyde is limited.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

Claims (7)

1. The utility model provides an outer wall inside wall formaldehyde reduction heat preservation mortar which characterized in that: the composition is prepared from the following raw materials in parts by weight: 30-47 parts of Portland cement, 10-20 parts of vitrified micro bubbles and Fe-TiO21-10 parts of activated carbon fiber, 3-8 parts of latex powder, 1-5 parts of polypropylene fiber, 1-5 parts of wood fiber, 5-10 parts of diatomite and 30-40 parts of deionized water.
2. The exterior wall inner side wall formaldehyde-reducing thermal insulation mortar of claim 1, which is characterized in that: the raw materials comprise, by weight, 35-47 parts of Portland cement, 13-17 parts of vitrified micro bubbles and Fe-TiO25-7 parts of activated carbon fiber, 5-6 parts of latex powder, 3-4 parts of polypropylene fiber, 3-4 parts of wood fiber, 5-8 parts of diatomite and 32-36 parts of deionized water.
3. The exterior wall inner side wall formaldehyde-reducing thermal insulation mortar of claim 1, which is characterized in that: the Fe-TiO2-the activated carbon fiber is prepared by the following steps:
1) HNO with the concentration of 2-4mol/L3Adding Fe (NO) into the solution3)3Solid, and stirring to dissolve to obtain solution A, HNO3HNO in solution3Molar amount of Fe (NO)3)310-15 times of the molar weight of (A);
2) deionized water is used as a solvent to prepare tetrabutyl titanate solution with the concentration of 2-5 mol/L;
3) dropwise adding the tetrabutyl titanate solution obtained in the step 2) into the solution A obtained in the step 1), stirring while dropwise adding, wherein the molar quantity of tetrabutyl titanate in the tetrabutyl titanate solution is Fe (NO)3)31-5% of molar weight, and continuously reacting for 4-6 hours after the dropwise addition is finished to obtain a mixed solution A;
4) adding activated carbon fiber into the mixed solution A while stirring, wherein the mass of the activated carbon fiber is 5-10 times of that of tetrabutyl titanate in the tetrabutyl titanate solution dropwise added in the step 3), and reacting for 4-6h after the dropwise addition is finished to obtain mixed solution B;
5) carrying out centrifugal separation on the mixed solution B to obtain a precipitate A, washing the precipitate A, and roasting the precipitate A for 2-3h in a nitrogen atmosphere at the temperature of 450-600 ℃ to obtain Fe-TiO2-activated carbon fibres.
4. The exterior wall inner side wall formaldehyde-reducing thermal insulation mortar of claim 3, which is characterized in that: the reaction temperature of the step 3) is 40-60 ℃.
5. The exterior wall inner side wall formaldehyde-reducing thermal insulation mortar of claim 3, which is characterized in that: the centrifugal rotating speed in the step 5) is 3500-6000r/min, and the centrifugal time is 3-5 min.
6. The exterior wall inner side wall formaldehyde-reducing thermal insulation mortar of claim 3, which is characterized in that: the activated carbon fiber is pretreated in the step 4) as follows:
soaking the activated carbon fiber in ethanol for 1h, taking out the activated carbon fiber, soaking in distilled water for 1h, taking out the activated carbon fiber, and drying.
7. The preparation method of the formaldehyde-reducing thermal insulation mortar for the inner side wall of the outer wall as claimed in any one of claims 1 to 6, which is characterized by comprising the following steps: the preparation method comprises the following preparation steps:
1) adding Fe-TiO into deionized water2Activated carbon fiber, latex powder, polypropylene fiber, wood fiber and the like are uniformly stirred to obtain a mixed solution C;
2) and adding the Portland cement and the vitrified micro bubbles into the mixed solution C, and uniformly stirring to obtain the formaldehyde-reducing thermal insulation mortar for the inner side wall of the outer wall.
CN202010464477.0A 2020-05-28 2020-05-28 Formaldehyde-reducing thermal-insulation mortar for inner side wall of outer wall and preparation method thereof Pending CN111777373A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114180888A (en) * 2021-11-25 2022-03-15 福建省三棵树新材料有限公司 Formaldehyde removal-based decoration material and preparation process thereof

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KR100747054B1 (en) * 2005-12-15 2007-08-07 (주) 서호건업 Block and the manufacturing of the same
CN102266762A (en) * 2011-05-12 2011-12-07 东华大学 Preparation method for TiO2-ACF material for removing indoor low concentration formaldehyde
CN103011721A (en) * 2012-11-16 2013-04-03 合肥神舟建筑工程有限公司 Modified nano-kieselguhr inorganic thermal-insulation mortar coated with plant ash and preparation method thereof
CN104310902A (en) * 2014-09-30 2015-01-28 青岛文创科技有限公司 Environment-friendly thermal insulation mortar
CN107936766A (en) * 2017-11-30 2018-04-20 明光市泰丰新材料有限公司 A kind of interior wall coating for purifying air and preparation method thereof

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Publication number Priority date Publication date Assignee Title
KR100747054B1 (en) * 2005-12-15 2007-08-07 (주) 서호건업 Block and the manufacturing of the same
CN102266762A (en) * 2011-05-12 2011-12-07 东华大学 Preparation method for TiO2-ACF material for removing indoor low concentration formaldehyde
CN103011721A (en) * 2012-11-16 2013-04-03 合肥神舟建筑工程有限公司 Modified nano-kieselguhr inorganic thermal-insulation mortar coated with plant ash and preparation method thereof
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CN107936766A (en) * 2017-11-30 2018-04-20 明光市泰丰新材料有限公司 A kind of interior wall coating for purifying air and preparation method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114180888A (en) * 2021-11-25 2022-03-15 福建省三棵树新材料有限公司 Formaldehyde removal-based decoration material and preparation process thereof

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