CN110668770B - Preparation method of environment-friendly building heat-insulating material - Google Patents
Preparation method of environment-friendly building heat-insulating material Download PDFInfo
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- CN110668770B CN110668770B CN201911110450.5A CN201911110450A CN110668770B CN 110668770 B CN110668770 B CN 110668770B CN 201911110450 A CN201911110450 A CN 201911110450A CN 110668770 B CN110668770 B CN 110668770B
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- 238000002360 preparation method Methods 0.000 title claims abstract description 51
- 239000011810 insulating material Substances 0.000 title claims abstract description 36
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical class O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 126
- 238000003756 stirring Methods 0.000 claims abstract description 69
- 239000000203 mixture Substances 0.000 claims abstract description 45
- 239000002699 waste material Substances 0.000 claims abstract description 42
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000000463 material Substances 0.000 claims abstract description 39
- 239000011398 Portland cement Substances 0.000 claims abstract description 29
- 238000010276 construction Methods 0.000 claims abstract description 29
- 238000001035 drying Methods 0.000 claims abstract description 29
- 239000000292 calcium oxide Substances 0.000 claims abstract description 20
- 235000012255 calcium oxide Nutrition 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000012774 insulation material Substances 0.000 claims abstract description 19
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 238000009413 insulation Methods 0.000 claims abstract description 9
- 239000000843 powder Substances 0.000 claims description 71
- 239000013543 active substance Substances 0.000 claims description 70
- 239000002245 particle Substances 0.000 claims description 31
- BNIILDVGGAEEIG-UHFFFAOYSA-L disodium hydrogen phosphate Chemical compound [Na+].[Na+].OP([O-])([O-])=O BNIILDVGGAEEIG-UHFFFAOYSA-L 0.000 claims description 18
- 229910000397 disodium phosphate Inorganic materials 0.000 claims description 18
- 235000019800 disodium phosphate Nutrition 0.000 claims description 18
- 238000000227 grinding Methods 0.000 claims description 18
- 238000002386 leaching Methods 0.000 claims description 18
- 239000007788 liquid Substances 0.000 claims description 18
- 238000002156 mixing Methods 0.000 claims description 11
- 239000004567 concrete Substances 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 9
- 239000008367 deionised water Substances 0.000 claims description 9
- 229910021641 deionized water Inorganic materials 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 9
- 239000000725 suspension Substances 0.000 claims description 9
- 239000008399 tap water Substances 0.000 claims description 9
- 235000020679 tap water Nutrition 0.000 claims description 9
- 238000005406 washing Methods 0.000 claims description 9
- 238000005303 weighing Methods 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 6
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 abstract description 66
- 230000000694 effects Effects 0.000 abstract description 27
- 238000001179 sorption measurement Methods 0.000 abstract description 21
- 238000004321 preservation Methods 0.000 abstract description 14
- 230000005587 bubbling Effects 0.000 abstract description 2
- 238000005336 cracking Methods 0.000 abstract description 2
- 239000011449 brick Substances 0.000 description 17
- 230000000052 comparative effect Effects 0.000 description 13
- 239000011464 hollow brick Substances 0.000 description 8
- 238000011161 development Methods 0.000 description 7
- 230000018109 developmental process Effects 0.000 description 7
- 238000011160 research Methods 0.000 description 7
- 238000004134 energy conservation Methods 0.000 description 5
- 238000000746 purification Methods 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- 239000002910 solid waste Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000004566 building material Substances 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000010451 perlite Substances 0.000 description 3
- 235000019362 perlite Nutrition 0.000 description 3
- 239000010802 sludge Substances 0.000 description 3
- 235000019738 Limestone Nutrition 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- XDLMVUHYZWKMMD-UHFFFAOYSA-N 3-trimethoxysilylpropyl 2-methylprop-2-enoate Chemical compound CO[Si](OC)(OC)CCCOC(=O)C(C)=C XDLMVUHYZWKMMD-UHFFFAOYSA-N 0.000 description 1
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 description 1
- 206010028980 Neoplasm Diseases 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000005842 biochemical reaction Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 239000010849 combustible waste Substances 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- SHFGJEQAOUMGJM-UHFFFAOYSA-N dialuminum dipotassium disodium dioxosilane iron(3+) oxocalcium oxomagnesium oxygen(2-) Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[Na+].[Na+].[Al+3].[Al+3].[K+].[K+].[Fe+3].[Fe+3].O=[Mg].O=[Ca].O=[Si]=O SHFGJEQAOUMGJM-UHFFFAOYSA-N 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011499 joint compound Substances 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- -1 sawdust Substances 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000010455 vermiculite Substances 0.000 description 1
- 229910052902 vermiculite Inorganic materials 0.000 description 1
- 235000019354 vermiculite Nutrition 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
Classifications
-
- 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
- C04B28/10—Lime cements or magnesium oxide 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
Abstract
The invention relates to a preparation method of an environment-friendly building heat-insulating material, which comprises the following steps: s1, stirring the construction waste reclaimed material, quicklime, lignocellulose and water to obtain a mixture A; s2, adding the modified diatomite and the ordinary portland cement into the mixture A obtained in the step S1, and stirring to obtain a mixture B; s3, pouring the mixture B obtained in the step S2 into a prefabricated model, curing and drying after initial setting to obtain the environment-friendly building heat-insulating material. The heat insulation material has good heat insulation and heat preservation effects, further improves the formaldehyde adsorption effect of the heat insulation material on the basis of ensuring the heat insulation and heat preservation effects, and can effectively reduce indoor pollution. The invention has the advantages of simple preparation process, wide raw material source, low product cost and no problems of wall cracking, bubbling and the like.
Description
Technical Field
The invention relates to a preparation method of an environment-friendly building heat-insulating material.
Background
The heat insulation material is a novel building material integrating decoration and heat insulation, and due to the fact that a large number of micropores exist in the heat insulation material, compared with solid bricks, the heat conductivity coefficient of a brick body is greatly reduced, and the heat insulation performance is enhanced; meanwhile, the brick body can be glazed and the like without other wall surface treatment, has the characteristics of light weight, heat insulation, heat preservation, sound absorption and the like, and has important significance for saving energy and promoting the national sustainable development.
The origin of the heat insulation material dates back to the fifties of the last century, at that time, China starts to manufacture the hollow bricks, but the development of the hollow bricks is slow due to the limitations of economy, technology and the like at that time; in the early stage of the sixties of the twentieth century, a batch of hollow load-bearing bricks were produced in Beijing, Shanghai and the like, but the hollow load-bearing bricks are not popularized in a large range; since the eighties of the last century, with the development of innovation and opening, the national economy enters the rapid development stage, and the nation starts to implement various policies of building material innovation and building energy conservation, so as to promote the research and development of heat-insulating materials and heat-insulating building blocks. The total amount of wall materials reaches 8000 hundred million blocks by 2007, and hollow products account for about 1/5, so that the development is rapid.
With the prohibition of clay bricks in China, the light hollow bricks produced by utilizing solid wastes become the best substitute, so that the solid wastes can be recycled, resources can be saved, and the method has economic and environmental benefits.
At present, the heat insulation material mainly achieves the purpose of forming a large number of micropores in the brick body by adding a pore-forming material, and because the heat conductivity coefficient of air wrapped in the micropores is low, the heat conductivity coefficient of the brick body is greatly reduced due to the existence of the micropores.
The pore-forming materials commonly used at present can be divided into three types, the first type is combustible pore-forming materials, such as straw, sawdust, coal dust, worn tires and the like, and the pore-forming materials are burnt at high temperature to leave holes; the second is industrial combustible waste such as paper industry waste, sludge, food industry waste, etc.; the third is a mineral pore-forming material, such as expanded vermiculite, expanded perlite, zeolite, diatomite, limestone powder and the like, wherein the expanded perlite and other materials contain a large number of pores, and the perlite and the limestone powder are subjected to a biochemical reaction at a high temperature to form a large number of pores.
The rapid development of economy and science and technology in the current society, the continuous acceleration of urban development and the increasingly severe energy problem in China are achieved, energy conservation and environmental protection are advocated in China, low-energy-consumption buildings also become research objects of experts in China, and in recent years, researchers in China pay more and more attention to the research on heat insulation materials. Researchers use solid wastes such as coal gangue, red mud, sludge, fly ash and the like to prepare heat insulation materials, and have made great progress in the aspect of novel walls after continuous efforts for decades. The raw materials are classified into solid waste and sludge waste discharged industrially.
Along with the intensification of greenhouse effect and environmental pollution, the research on building energy conservation and green buildings is more and more emphasized in all countries in the world. In the building, the outer wall is not only divided into indoor and outdoor, but also plays a role in heat preservation, so that the comfort of indoor temperature is ensured, how to reduce indoor and outdoor heat exchange is realized, and the reduction of the heat transfer coefficient of the wall body becomes an important research direction for building energy conservation. The western European and American countries start to replace solid bricks by hollow bricks and lightweight wall materials in the fifth and sixty years of the twentieth century, and the situation that the hollow bricks, the solid bricks and various novel wall materials coexist is formed. In Belgium, from 50 to 70 in the 20 th century, the proportion of solid bricks in the wall material is reduced from 95% to 40%, and the proportion of hollow bricks is increased from only 2% to 48%, so that the conversion from the solid bricks to the hollow bricks is basically realized. In recent years, with the continuous research of scientific researchers on the aspect of building energy conservation, the hollow brick is greatly developed, wherein in the porous brick, the maximum number of holes can reach 134, the maximum void ratio can reach 65%, and the thinnest hole wall is only 3 mm. For example, the single-wall heat-insulating brick developed in Germany not only greatly improves the thermal property of the brick through a large number of holes in the brick and heat-insulating mortar filled in the holes, but also obviously improves the mechanical property of the brick body due to the existence of the heat-insulating mortar.
Although the technology is continuously advanced, the environment-friendly building material is gradually becoming the tumor product in the market, the heat insulation material not only focuses on the heat insulation effect, but also focuses on the functional function (for example, adsorbing harmful substances, etc.) of the heat insulation material, and patent document CN109336530B discloses a building waste regeneration heat insulation material which has the effect of adsorbing formaldehyde, however, in the face of today's increasingly harsh market competition environment, the adsorption effect of the heat insulation material to formaldehyde is not particularly ideal, and there is still a further improved demand.
Disclosure of Invention
In order to solve the technical problem that the adsorption effect of the heat-insulating material on formaldehyde in the prior art is not particularly ideal, the invention provides the following technical scheme:
the preparation method of the environment-friendly building heat-insulating material is characterized by comprising the following steps:
s1, stirring the construction waste reclaimed material, quicklime, lignocellulose and water to obtain a mixture A;
s2, adding the modified diatomite and the ordinary portland cement into the mixture A obtained in the step S1, and stirring to obtain a mixture B;
s3, pouring the mixture B obtained in the step S2 into a prefabricated model, curing and drying after initial setting to obtain the environment-friendly building heat-insulating material.
The environment-friendly building heat-insulating material comprises the following raw materials in parts by weight: 60 parts of construction waste recycled materials, 10 parts of ordinary portland cement, 3 parts of quicklime, 10 parts of modified diatomite and 4 parts of lignocellulose;
the preparation process of the modified diatomite comprises the following steps:
(1) grinding the shell to obtain shell powder with the particle size of 80-120 nm;
(2) leaching the shell powder prepared in the step (1) by using a sodium hydrogen phosphate solution to obtain liquid-containing shell powder;
(3) preserving the heat of the shell powder with the liquid obtained in the step (2) at 500 ℃ for 10min, leaching with tap water, and drying to obtain active shell powder;
(4) weighing kieselguhr with the particle size of 800-900 nm, putting the kieselguhr into deionized water, stirring to form a suspension, adding an active agent, performing ultrasonic stirring, washing, filtering, and drying a product to obtain active kieselguhr;
(5) mixing active shell powder and active diatomite, stirring for 20min while keeping the temperature, cooling, and grinding to obtain modified diatomite;
the composite fertilizer comprises, by weight, 4 parts of active shell powder, 5 parts of diatomite and 1 part of an active agent.
In the preparation process of the modified diatomite, the active agent in the step (4) is composed of an active agent I and an active agent II according to the weight ratio of 2: 1;
wherein, the structural formula of the active agent I is as follows:
wherein, the chemical structural formula of the active agent II is as follows:
preferably, the temperature for the heat preservation in step (5) of the process for preparing modified diatomaceous earth is 550 ℃.
Preferably, the construction waste recycled material is waste concrete with the particle size of 40 mu m.
Preferably, the strength grade of ordinary portland cement is 42.5.
Preferably, the concentration of the sodium hydrogen phosphate solution is 3.5%.
Preferably, the ultrasonic stirring temperature in the step (4) of the preparation process of the modified diatomite is 60 ℃, and the ultrasonic stirring time is 2 hours.
The technical scheme of the invention has the following beneficial effects:
(1) the heat insulation material has good heat insulation and heat preservation effects, further improves the formaldehyde adsorption effect of the heat insulation material on the basis of ensuring the heat insulation and heat preservation effects, and can reduce indoor pollution. The invention has the advantages of simple preparation process, wide raw material source, low product cost and no problems of wall cracking, bubbling and the like.
(2) The formaldehyde adsorption effect of the modified diatomite can be greatly improved by treating the diatomite with the specific composite active agent (composed of the active agent I and the active agent II), the active agent is beneficial to improving the adsorption speed and the balance adsorption quantity of the diatomite surface to formaldehyde gas, and compared with the existing active agent, the specific active agent used in the invention can synergistically improve the formaldehyde adsorption effect of the modified diatomite (the formaldehyde purification rate is more than 85% in 8h), and the adsorption effect is superior to that of a single active agent or a collocation mode of a non-invention embodiment.
(3) The optimal stirring and heat-insulating temperature of the active shell powder and the active diatomite is not 450 ℃ acknowledged in the prior art, and researches show that the active shell powder with small particle size can achieve better modification effect on the diatomite with large particle size and a porous structure by increasing the mixing temperature of the active shell powder and the active diatomite to 550 ℃, so that the formaldehyde adsorption effect is improved (the formaldehyde purification rate is more than 90% in 8h), the higher the temperature is, and the formaldehyde adsorption effect is reduced when the temperature exceeds 550 ℃ (such as 650 ℃).
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the following examples and comparative examples.
Example 1
The preparation method of the environment-friendly building heat-insulating material is characterized by comprising the following steps:
s1, stirring the construction waste reclaimed material, quicklime, lignocellulose and water to obtain a mixture A;
s2, adding the modified diatomite and the ordinary portland cement into the mixture A obtained in the step S1, and stirring to obtain a mixture B;
s3, pouring the mixture B obtained in the step S2 into a prefabricated model, curing and drying after initial setting to obtain the environment-friendly building heat-insulating material.
The environment-friendly building heat-insulating material comprises the following raw materials in parts by weight: 60 parts of construction waste recycled materials, 10 parts of ordinary portland cement, 3 parts of quicklime, 10 parts of modified diatomite and 4 parts of lignocellulose;
the preparation process of the modified diatomite comprises the following steps:
(1) grinding the shell to obtain shell powder with the particle size of 80-120 nm;
(2) leaching the shell powder prepared in the step (1) by using a sodium hydrogen phosphate solution to obtain liquid-containing shell powder;
(3) preserving the heat of the shell powder with the liquid obtained in the step (2) at 500 ℃ for 10min, leaching with tap water, and drying to obtain active shell powder;
(4) weighing kieselguhr with the particle size of 800-900 nm, putting the kieselguhr into deionized water, stirring to form a suspension, adding an active agent, performing ultrasonic stirring, washing, filtering, and drying a product to obtain active kieselguhr;
(5) mixing active shell powder and active diatomite, stirring for 20min while keeping the temperature, cooling, and grinding to obtain modified diatomite;
wherein, the weight parts of active shell powder are 4, the weight parts of diatomite are 5, and the weight parts of an active agent are 1; in the preparation process of the modified diatomite, the active agent in the step (4) is composed of an active agent I and an active agent II according to the weight ratio of 2: 1;
wherein, the structural formula of the active agent I is as follows:
wherein, the chemical structural formula of the active agent II is as follows:
wherein the heat preservation temperature in the step (5) of the preparation process of the modified diatomite is 550 ℃, the construction waste recycled material is waste concrete with the particle size of 40 mu m, the strength grade of the ordinary portland cement is 42.5, the concentration of the sodium hydrogen phosphate solution is 3.5 percent, the ultrasonic stirring temperature in the step (4) of the preparation process of the modified diatomite is 60 ℃, and the ultrasonic stirring time is 2 hours.
Example 2
The preparation method of the environment-friendly building heat-insulating material is characterized by comprising the following steps:
s1, stirring the construction waste reclaimed material, quicklime, lignocellulose and water to obtain a mixture A;
s2, adding the modified diatomite and the ordinary portland cement into the mixture A obtained in the step S1, and stirring to obtain a mixture B;
s3, pouring the mixture B obtained in the step S2 into a prefabricated model, curing and drying after initial setting to obtain the environment-friendly building heat-insulating material.
The environment-friendly building heat-insulating material comprises the following raw materials in parts by weight: 60 parts of construction waste recycled materials, 10 parts of ordinary portland cement, 3 parts of quicklime, 10 parts of modified diatomite and 4 parts of lignocellulose;
the preparation process of the modified diatomite comprises the following steps:
(1) grinding the shell to obtain shell powder with the particle size of 80-120 nm;
(2) leaching the shell powder prepared in the step (1) by using a sodium hydrogen phosphate solution to obtain liquid-containing shell powder;
(3) preserving the heat of the shell powder with the liquid obtained in the step (2) at 500 ℃ for 10min, leaching with tap water, and drying to obtain active shell powder;
(4) weighing kieselguhr with the particle size of 800-900 nm, putting the kieselguhr into deionized water, stirring to form a suspension, adding an active agent, performing ultrasonic stirring, washing, filtering, and drying a product to obtain active kieselguhr;
(5) mixing active shell powder and active diatomite, stirring for 20min while keeping the temperature, cooling, and grinding to obtain modified diatomite;
wherein, the weight parts of active shell powder are 4, the weight parts of diatomite are 5, and the weight parts of an active agent are 1; in the preparation process of the modified diatomite, the active agent in the step (4) is composed of an active agent I and an active agent II according to the weight ratio of 2: 1;
wherein, the structural formula of the active agent I is as follows:
wherein, the chemical structural formula of the active agent II is as follows:
wherein the heat preservation temperature in the step (5) of the preparation process of the modified diatomite is 450 ℃, the construction waste recycled material is waste concrete with the particle size of 40 mu m, the strength grade of the ordinary portland cement is 42.5, the concentration of the sodium hydrogen phosphate solution is 3.5 percent, the ultrasonic stirring temperature in the step (4) of the preparation process of the modified diatomite is 60 ℃, and the ultrasonic stirring time is 2 hours.
Example 3
The preparation method of the environment-friendly building heat-insulating material is characterized by comprising the following steps:
s1, stirring the construction waste reclaimed material, quicklime, lignocellulose and water to obtain a mixture A;
s2, adding the modified diatomite and the ordinary portland cement into the mixture A obtained in the step S1, and stirring to obtain a mixture B;
s3, pouring the mixture B obtained in the step S2 into a prefabricated model, curing and drying after initial setting to obtain the environment-friendly building heat-insulating material.
The environment-friendly building heat-insulating material comprises the following raw materials in parts by weight: 60 parts of construction waste recycled materials, 10 parts of ordinary portland cement, 3 parts of quicklime, 10 parts of modified diatomite and 4 parts of lignocellulose;
the preparation process of the modified diatomite comprises the following steps:
(1) grinding the shell to obtain shell powder with the particle size of 80-120 nm;
(2) leaching the shell powder prepared in the step (1) by using a sodium hydrogen phosphate solution to obtain liquid-containing shell powder;
(3) preserving the heat of the shell powder with the liquid obtained in the step (2) at 500 ℃ for 10min, leaching with tap water, and drying to obtain active shell powder;
(4) weighing kieselguhr with the particle size of 800-900 nm, putting the kieselguhr into deionized water, stirring to form a suspension, adding an active agent, performing ultrasonic stirring, washing, filtering, and drying a product to obtain active kieselguhr;
(5) mixing active shell powder and active diatomite, stirring for 20min while keeping the temperature, cooling, and grinding to obtain modified diatomite;
wherein, the weight parts of active shell powder are 4, the weight parts of diatomite are 5, and the weight parts of an active agent are 1; in the preparation process of the modified diatomite, the active agent in the step (4) is composed of an active agent I and an active agent II according to the weight ratio of 2: 1;
wherein, the structural formula of the active agent I is as follows:
wherein, the chemical structural formula of the active agent II is as follows:
wherein the heat preservation temperature in the step (5) of the preparation process of the modified diatomite is 650 ℃, the construction waste recycled material is waste concrete with the particle size of 40 mu m, the strength grade of the ordinary portland cement is 42.5, the concentration of the sodium hydrogen phosphate solution is 3.5 percent, the ultrasonic stirring temperature in the step (4) of the preparation process of the modified diatomite is 60 ℃, and the ultrasonic stirring time is 2 hours.
Comparative example 1
The preparation method of the environment-friendly building heat-insulating material is characterized by comprising the following steps:
s1, stirring the construction waste reclaimed material, quicklime, lignocellulose and water to obtain a mixture A;
s2, adding the modified diatomite and the ordinary portland cement into the mixture A obtained in the step S1, and stirring to obtain a mixture B;
s3, pouring the mixture B obtained in the step S2 into a prefabricated model, curing and drying after initial setting to obtain the environment-friendly building heat-insulating material.
The environment-friendly building heat-insulating material comprises the following raw materials in parts by weight: 60 parts of construction waste recycled materials, 10 parts of ordinary portland cement, 3 parts of quicklime, 10 parts of modified diatomite and 4 parts of lignocellulose;
the preparation process of the modified diatomite comprises the following steps:
(1) grinding the shell to obtain shell powder with the particle size of 80-120 nm;
(2) leaching the shell powder prepared in the step (1) by using a sodium hydrogen phosphate solution to obtain liquid-containing shell powder;
(3) preserving the heat of the shell powder with the liquid obtained in the step (2) at 500 ℃ for 10min, leaching with tap water, and drying to obtain active shell powder;
(4) weighing kieselguhr with the particle size of 800-900 nm, putting the kieselguhr into deionized water, stirring to form a suspension, adding an active agent, performing ultrasonic stirring, washing, filtering, and drying a product to obtain active kieselguhr;
(5) mixing active shell powder and active diatomite, stirring for 20min while keeping the temperature, cooling, and grinding to obtain modified diatomite;
wherein, the weight parts of active shell powder are 4, the weight parts of diatomite are 5, and the weight parts of an active agent are 1; in the preparation process of the modified diatomite, the active agent in the step (4) is composed of hexadecyl trimethyl ammonium bromide and an active agent II according to the weight ratio of 2: 1;
wherein, the chemical structural formula of the active agent II is as follows:
wherein the heat preservation temperature in the step (5) of the preparation process of the modified diatomite is 550 ℃, the construction waste recycled material is waste concrete with the particle size of 40 mu m, the strength grade of the ordinary portland cement is 42.5, the concentration of the sodium hydrogen phosphate solution is 3.5 percent, the ultrasonic stirring temperature in the step (4) of the preparation process of the modified diatomite is 60 ℃, and the ultrasonic stirring time is 2 hours.
Comparative example 2
The preparation method of the environment-friendly building heat-insulating material is characterized by comprising the following steps:
s1, stirring the construction waste reclaimed material, quicklime, lignocellulose and water to obtain a mixture A;
s2, adding the modified diatomite and the ordinary portland cement into the mixture A obtained in the step S1, and stirring to obtain a mixture B;
s3, pouring the mixture B obtained in the step S2 into a prefabricated model, curing and drying after initial setting to obtain the environment-friendly building heat-insulating material.
The environment-friendly building heat-insulating material comprises the following raw materials in parts by weight: 60 parts of construction waste recycled materials, 10 parts of ordinary portland cement, 3 parts of quicklime, 10 parts of modified diatomite and 4 parts of lignocellulose;
the preparation process of the modified diatomite comprises the following steps:
(1) grinding the shell to obtain shell powder with the particle size of 80-120 nm;
(2) leaching the shell powder prepared in the step (1) by using a sodium hydrogen phosphate solution to obtain liquid-containing shell powder;
(3) preserving the heat of the shell powder with the liquid obtained in the step (2) at 500 ℃ for 10min, leaching with tap water, and drying to obtain active shell powder;
(4) weighing kieselguhr with the particle size of 800-900 nm, putting the kieselguhr into deionized water, stirring to form a suspension, adding an active agent, performing ultrasonic stirring, washing, filtering, and drying a product to obtain active kieselguhr;
(5) mixing active shell powder and active diatomite, stirring for 20min while keeping the temperature, cooling, and grinding to obtain modified diatomite;
wherein, the weight parts of active shell powder are 4, the weight parts of diatomite are 5, and the weight parts of an active agent are 1; the preparation process of the modified diatomite comprises the following steps of (4) preparing an active agent, namely an active agent I and gamma-methacryloxypropyltrimethoxysilane according to the weight ratio of 2: 1;
wherein, the structural formula of the active agent I is as follows:
wherein the heat preservation temperature in the step (5) of the preparation process of the modified diatomite is 550 ℃, the construction waste recycled material is waste concrete with the particle size of 40 mu m, the strength grade of the ordinary portland cement is 42.5, the concentration of the sodium hydrogen phosphate solution is 3.5 percent, the ultrasonic stirring temperature in the step (4) of the preparation process of the modified diatomite is 60 ℃, and the ultrasonic stirring time is 2 hours.
Comparative example 3
The preparation method of the environment-friendly building heat-insulating material is characterized by comprising the following steps:
s1, stirring the construction waste reclaimed material, quicklime, lignocellulose and water to obtain a mixture A;
s2, adding the modified diatomite and the ordinary portland cement into the mixture A obtained in the step S1, and stirring to obtain a mixture B;
s3, pouring the mixture B obtained in the step S2 into a prefabricated model, curing and drying after initial setting to obtain the environment-friendly building heat-insulating material.
The environment-friendly building heat-insulating material comprises the following raw materials in parts by weight: 60 parts of construction waste recycled materials, 10 parts of ordinary portland cement, 3 parts of quicklime, 10 parts of modified diatomite and 4 parts of lignocellulose;
the preparation process of the modified diatomite comprises the following steps:
(1) grinding the shell to obtain shell powder with the particle size of 80-120 nm;
(2) leaching the shell powder prepared in the step (1) by using a sodium hydrogen phosphate solution to obtain liquid-containing shell powder;
(3) preserving the heat of the shell powder with the liquid obtained in the step (2) at 500 ℃ for 10min, leaching with tap water, and drying to obtain active shell powder;
(4) weighing kieselguhr with the particle size of 800-900 nm, putting the kieselguhr into deionized water, stirring to form a suspension, adding an active agent, performing ultrasonic stirring, washing, filtering, and drying a product to obtain active kieselguhr;
(5) mixing active shell powder and active diatomite, stirring for 20min while keeping the temperature, cooling, and grinding to obtain modified diatomite;
wherein, the weight parts of active shell powder are 4, the weight parts of diatomite are 5, and the weight parts of an active agent are 1; preparation process of modified diatomite, in the step (4), the active agent is composed of an active agent I;
wherein, the structural formula of the active agent I is as follows:
wherein the heat preservation temperature in the step (5) of the preparation process of the modified diatomite is 550 ℃, the construction waste recycled material is waste concrete with the particle size of 40 mu m, the strength grade of the ordinary portland cement is 42.5, the concentration of the sodium hydrogen phosphate solution is 3.5 percent, the ultrasonic stirring temperature in the step (4) of the preparation process of the modified diatomite is 60 ℃, and the ultrasonic stirring time is 2 hours.
Comparative example 4
The preparation method of the environment-friendly building heat-insulating material is characterized by comprising the following steps:
s1, stirring the construction waste reclaimed material, quicklime, lignocellulose and water to obtain a mixture A;
s2, adding the modified diatomite and the ordinary portland cement into the mixture A obtained in the step S1, and stirring to obtain a mixture B;
s3, pouring the mixture B obtained in the step S2 into a prefabricated model, curing and drying after initial setting to obtain the environment-friendly building heat-insulating material.
The environment-friendly building heat-insulating material comprises the following raw materials in parts by weight: 60 parts of construction waste recycled materials, 10 parts of ordinary portland cement, 3 parts of quicklime, 10 parts of modified diatomite and 4 parts of lignocellulose;
the preparation process of the modified diatomite comprises the following steps:
(1) grinding the shell to obtain shell powder with the particle size of 80-120 nm;
(2) leaching the shell powder prepared in the step (1) by using a sodium hydrogen phosphate solution to obtain liquid-containing shell powder;
(3) preserving the heat of the shell powder with the liquid obtained in the step (2) at 500 ℃ for 10min, leaching with tap water, and drying to obtain active shell powder;
(4) weighing kieselguhr with the particle size of 800-900 nm, putting the kieselguhr into deionized water, stirring to form a suspension, adding an active agent, performing ultrasonic stirring, washing, filtering, and drying a product to obtain active kieselguhr;
(5) mixing active shell powder and active diatomite, stirring for 20min while keeping the temperature, cooling, and grinding to obtain modified diatomite;
wherein, the weight parts of active shell powder are 4, the weight parts of diatomite are 5, and the weight parts of an active agent are 1; preparation process of modified diatomite, in the step (4), the active agent is composed of an active agent II;
wherein, the chemical structural formula of the active agent II is as follows:
wherein the heat preservation temperature in the step (5) of the preparation process of the modified diatomite is 550 ℃, the construction waste recycled material is waste concrete with the particle size of 40 mu m, the strength grade of the ordinary portland cement is 42.5, the concentration of the sodium hydrogen phosphate solution is 3.5 percent, the ultrasonic stirring temperature in the step (4) of the preparation process of the modified diatomite is 60 ℃, and the ultrasonic stirring time is 2 hours.
The preparation method of the environment-friendly building heat-insulating material comprises the following steps:
s1, stirring the construction waste reclaimed material, quicklime, lignocellulose and water to obtain a mixture A;
s2, adding the modified diatomite and the ordinary portland cement into the mixture A obtained in the step S1, and stirring to obtain a mixture B;
s3, pouring the mixture B obtained in the step S2 into a prefabricated model, curing and drying after initial setting to obtain the environment-friendly building heat-insulating material.
The following table details the composition of the active agent and the temperature in step (5) of the modified diatomaceous earth in examples 1 to 3 and comparative examples 1 to 4.
In order to verify the formaldehyde removing adsorption effect of the examples 1 to 3 and the comparative examples 1 to 4, the formaldehyde removing adsorption effect of the samples of the examples 1 to 3 and the comparative examples 1 to 4 was tested, and the test method (including the parameters such as concentration, pressure and concentration) refers to the test procedure of CN109336530B formaldehyde adsorption performance, and the results are as follows:
| numbering | Formaldehyde purification rate (8h) |
| Example 1 | 91.2％ |
| Example 2 | 87.9％ |
| Example 3 | 88.5％ |
| Comparative example 1 | 82.6％ |
| Comparative example 2 | 84.3％ |
| Comparative example 3 | 78.4％ |
| Comparative example 4 | 76.1％ |
The above results show that: (1) from the effect data of examples 1-3 and comparative examples 1-4, it can be seen that the formaldehyde adsorption effect of the modified diatomite can be greatly improved by treating the diatomite with the composite active agent (composed of the active agent I and the active agent II), the active agent is beneficial to improving the formaldehyde adsorption speed and the equilibrium adsorption amount on the surface of the diatomite, compared with the existing active agent, the specific active agent used in the invention can synergistically improve the formaldehyde adsorption effect of the modified diatomite (the formaldehyde purification rate is more than 85% in 8h), and the adsorption effect is better than that of a single active agent or a collocation manner described in non-examples 1-3. (2) From the effect data of the example 1 and the examples 2 to 3, it can be seen that the optimal stirring and heat-insulating temperature of the active shell powder and the active diatomite is not 450 ℃ which is generally accepted in the prior art, and the research of the invention finds that the active shell powder with small particle size can achieve better modification effect on the diatomite with large particle size and porous structure by increasing the mixing temperature of the active shell powder and the active diatomite to 550 ℃, so as to improve formaldehyde adsorption effect (formaldehyde purification rate of more than 90% for 8h), and the higher the temperature is, the better the temperature is, and the formaldehyde adsorption effect shows a tendency of decreasing after the temperature exceeds 550 ℃ (such as 650 ℃).
Claims (6)
1. The preparation method of the environment-friendly building heat-insulating material is characterized by comprising the following steps:
s1, stirring the construction waste reclaimed material, quicklime, lignocellulose and water to obtain a mixture A;
s2, adding the modified diatomite and the ordinary portland cement into the mixture A obtained in the step S1, and stirring to obtain a mixture B;
s3, pouring the mixture B obtained in the step S2 into a prefabricated model, curing and drying after initial setting to obtain the environment-friendly building heat-insulating material;
the environment-friendly building heat-insulating material comprises the following raw materials in parts by weight: 60 parts of construction waste recycled materials, 10 parts of ordinary portland cement, 3 parts of quicklime, 10 parts of modified diatomite and 4 parts of lignocellulose;
the preparation process of the modified diatomite comprises the following steps:
(1) grinding the shell to obtain shell powder with the particle size of 80-120 nm;
(2) leaching the shell powder prepared in the step (1) by using a sodium hydrogen phosphate solution to obtain liquid-containing shell powder;
(3) preserving the heat of the shell powder with the liquid obtained in the step (2) at 500 ℃ for 10min, leaching with tap water, and drying to obtain active shell powder;
(4) weighing kieselguhr with the particle size of 800-900 nm, putting the kieselguhr into deionized water, stirring to form a suspension, adding an active agent, performing ultrasonic stirring, washing, filtering, and drying a product to obtain active kieselguhr;
(5) mixing active shell powder and active diatomite, stirring for 20min while keeping the temperature, cooling, and grinding to obtain modified diatomite;
wherein, the weight parts of active shell powder are 4, the weight parts of diatomite are 5, and the weight parts of an active agent are 1;
in the preparation process of the modified diatomite, the active agent in the step (4) is composed of an active agent I and an active agent II according to the weight ratio of 2: 1;
wherein, the structural formula of the active agent I is as follows:
wherein, the chemical structural formula of the active agent II is as follows:
2. the method for preparing environment-friendly building thermal insulation material according to claim 1, wherein the thermal insulation temperature in the step (5) of the preparation process of the modified diatomite is 550 ℃.
3. The method for preparing the environment-friendly building thermal insulation material as claimed in claim 1, wherein the construction waste recycled material is waste concrete with the particle size of 40 μm.
4. The method for preparing environment-friendly building thermal insulation material according to claim 1, wherein the strength grade of the ordinary portland cement is 42.5.
5. The method for preparing environment-friendly building thermal insulation material according to claim 1, wherein the concentration of the sodium hydrogen phosphate solution is 3.5%.
6. The method for preparing the environment-friendly building thermal insulation material according to claim 1, wherein the ultrasonic stirring temperature in the step (4) of the preparation process of the modified diatomite is 60 ℃, and the ultrasonic stirring time is 2 hours.
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