Residue soil base baking-free light thermal insulation material and preparation method and application thereof
阅读说明：本技术 渣土基免烧轻质保温材料及其制备方法和应用 (Residue soil base baking-free light thermal insulation material and preparation method and application thereof ) 是由 张水 李水生 阳栋 于 2021-09-07 设计创作，主要内容包括：本发明公开了一种渣土基免烧轻质保温材料及其制备方法和应用,包括：工程渣土以干重计80份～100份、无机轻集料15份～65份、轻烧氧化镁5份～30份、氯化镁1份～15份、聚合物乳液3份～10份、纤维0.2份～1.5份、改性剂0.1份～1.5份。本发明的渣土基免烧轻质保温材料,以工程渣土为基体材料,无机轻集料为骨料,轻烧氧化镁、氯化镁、聚合物乳液为复合胶结材料,实现了工程渣土资源化利用。上述渣土基免烧轻质保温材料具有质轻、保温、隔热、防火的特性,可在建筑墙体保温中广泛应用。(The invention discloses a slag-based baking-free light thermal insulation material and a preparation method and application thereof, wherein the slag-based baking-free light thermal insulation material comprises the following components: the engineering slag soil comprises 80 to 100 portions of dry weight, 15 to 65 portions of inorganic light aggregate, 5 to 30 portions of light calcined magnesia, 1 to 15 portions of magnesium chloride, 3 to 10 portions of polymer emulsion, 0.2 to 1.5 portions of fiber and 0.1 to 1.5 portions of modifier. The residue soil-based baking-free light heat-insulating material disclosed by the invention takes engineering residue soil as a matrix material, inorganic light aggregate as aggregate, and light-burned magnesium oxide, magnesium chloride and polymer emulsion as a composite cementing material, so that the resource utilization of the engineering residue soil is realized. The slag-soil-based baking-free light thermal insulation material has the characteristics of light weight, thermal insulation, heat insulation and fire prevention, and can be widely applied to thermal insulation of building walls.)
1. The residue soil-based baking-free light thermal insulation material is characterized by comprising the following components in parts by mass:
the engineering slag soil comprises 80 to 100 portions of dry weight, 15 to 65 portions of inorganic light aggregate, 5 to 30 portions of light calcined magnesia, 1 to 15 portions of magnesium chloride, 3 to 10 portions of polymer emulsion, 0.2 to 1.5 portions of fiber and 0.1 to 1.5 portions of modifier.
2. The muck-based unfired lightweight thermal insulation material according to claim 1, wherein,
the engineering slag soil comprises 85 to 95 parts by dry weight, 15 to 65 parts by weight of inorganic light aggregate, 8 to 25 parts by weight of light calcined magnesia, 2 to 9 parts by weight of magnesium chloride, 5 to 8 parts by weight of polymer emulsion, 0.2 to 1.0 part by weight of fiber and 0.3 to 1.0 part by weight of modifier.
3. The muck-based unburned light-weight thermal insulation material according to claim 1 or 2,
the engineering muck is soil muck generated by foundation pit excavation or underground engineering construction; and/or the presence of a gas in the gas,
the water content of the engineering muck is lower than 3%.
4. The muck-based unburned light-weight thermal insulation material according to claim 1 or 2,
the inorganic lightweight aggregate adopts at least one of expanded perlite and vitrified micro-beads; and/or the presence of a gas in the gas,
the inorganic lightweight aggregate has a bulk density of not more than 120kg/m3。
5. The muck-based unburned light-weight thermal insulation material according to claim 1 or 2,
the polymer emulsion adopts at least one of VAE emulsion and polyvinyl alcohol emulsion; and/or
The solid content of the polymer emulsion is more than or equal to 50 percent.
6. The muck-based unburned light-weight thermal insulation material according to claim 1 or 2,
the fiber is at least one of crop straw fiber and polypropylene fiber; and/or the presence of a gas in the gas,
the length of the fibers does not exceed 20 mm; and/or the presence of a gas in the gas,
the modifier is at least one of phosphate, sulfate, phosphoric acid or silicon powder.
7. The preparation method of the muck-based unfired light thermal insulation material as claimed in any one of claims 1 to 6, which is characterized by comprising the following steps:
s1, adding magnesium chloride into water, and uniformly stirring to obtain a magnesium chloride aqueous solution;
s2, adding a modifier into the magnesium chloride aqueous solution obtained in the step S1, and uniformly stirring to obtain a mixture A;
s3, uniformly stirring the inorganic lightweight aggregate and the polymer emulsion, and uniformly stirring the inorganic lightweight aggregate, the polymer emulsion, the engineering slag soil, the light burned magnesium oxide and the fibers to obtain a mixture B;
s4, adding the mixture A obtained in the step S2 into the mixture B obtained in the step S3 in a spraying mode, and uniformly stirring to obtain a mixture C;
s5, filling the mixture C obtained in the step S4 into a mold, adopting a pressure forming process, demolding, and curing to obtain the residue soil-based baking-free light heat-insulating material.
8. The method for preparing the slag-based baking-free light thermal insulation material according to claim 7, characterized in that,
the Baume degree of the magnesium chloride aqueous solution in the step S1 is 22-30; and/or
In the step S3, the engineering muck is crushed to a particle size of less than 4.75 mm.
9. The method for preparing the slag-based baking-free light thermal insulation material according to claim 7, characterized in that,
the water content of the mixture C in the step S4 is 6-18%; and/or
The molding pressure of the pressure molding process in the step S5 is 5 MPa-15 MPa.
10. Use of the residue soil-based baking-free light thermal insulation material according to any one of claims 1 to 6 or the residue soil-based baking-free light thermal insulation material prepared by the preparation method according to any one of claims 7 to 9 in building thermal insulation building material products.
Technical Field
The invention relates to the field of solid waste treatment, in particular to a residue soil-based baking-free light heat-insulating material. In addition, the invention also relates to a preparation method of the slag-soil-based baking-free light thermal insulation material.
Background
With the development of economy and the advancement of urbanization, construction waste continuously and rapidly increases. According to data statistics, about 18 hundred million t of construction wastes are generated every year, the resource utilization rate is less than 5 percent, and the current stock of construction wastes reaches more than 200 hundred million t. Among these construction wastes, the engineering waste has become the "prime force". At present, the main disposal method of engineering dregs is mainly to send to a receiving field for centralized landfill or stacking, and the situation of 'dregs enclosing city' is formed. The engineering dregs are buried or stacked in a centralized way, which not only occupies a large amount of land resources, pollutes the surrounding environment and has expensive disposal cost, but also has potential safety hazard.
The engineering slag soil is a mineral deposit in a city, is a resource misplaced place, and should be researched and utilized. At present, the utilization of engineering muck is concentrated on: separating sand and stone in the engineering muck, and preparing the sand through processes of washing, screening and the like; engineering residue soil is used as a main raw material, and building material products such as bricks, ceramsite and the like are manufactured by adopting a sintering process. However, the above method for resource utilization of engineering slag soil still has the problems of low utilization rate, high energy consumption and the like.
Disclosure of Invention
The invention provides a slag-soil-based non-fired light thermal insulation material and a preparation method and application thereof, and aims to solve the technical problems of low resource utilization rate of engineering slag soil and high energy consumption of slag-soil-based sintered products.
The technical scheme adopted by the invention is as follows:
the residue soil-based baking-free light thermal insulation material comprises the following components in parts by mass: the engineering slag soil comprises 80 to 100 portions of dry weight, 15 to 65 portions of inorganic light aggregate, 5 to 30 portions of light calcined magnesia, 1 to 15 portions of magnesium chloride, 3 to 10 portions of polymer emulsion, 0.2 to 1.5 portions of fiber and 0.1 to 1.5 portions of modifier.
Furthermore, the engineering slag soil comprises 85 to 95 parts by dry weight of inorganic light aggregate 15 to 65 parts, 8 to 25 parts by light-burned magnesia, 2 to 9 parts by magnesium chloride, 5 to 8 parts by polymer emulsion, 0.2 to 1.0 part by fiber and 0.3 to 1.0 part by modifier.
Further, the engineering muck is soil-like muck generated by foundation pit excavation or underground engineering construction; and/or the water content of the engineering muck is lower than 3 percent.
Further, the inorganic lightweight aggregate adopts at least one of expanded perlite and vitrified micro bubbles; and/or the bulk density of the inorganic lightweight aggregate is not more than 120kg/m3。
Further, the polymer emulsion adopts at least one of VAE emulsion and polyvinyl alcohol emulsion; and/or the solid content of the polymer emulsion is more than or equal to 50 percent.
Furthermore, the fiber is at least one of crop straw fiber and polypropylene fiber; and/or the length of the fibres does not exceed 20 mm.
Further, the modifier adopts at least one of phosphate, sulfate, phosphoric acid or silicon powder.
According to another aspect of the invention, the preparation method of the slag-soil based baking-free light thermal insulation material comprises the following steps:
s1, adding magnesium chloride into water, and uniformly stirring to obtain a magnesium chloride aqueous solution;
s2, adding a modifier into the magnesium chloride aqueous solution obtained in the step S1, and uniformly stirring to obtain a mixture A;
s3, uniformly stirring the inorganic lightweight aggregate and the polymer emulsion, and uniformly stirring the inorganic lightweight aggregate, the polymer emulsion, the engineering slag soil, the light burned magnesium oxide and the fibers to obtain a mixture B;
s4, adding the mixture A obtained in the step S2 into the mixture B obtained in the step S3 in a spraying mode, and uniformly stirring to obtain a mixture C;
s5, filling the mixture C obtained in the step S4 into a mold, adopting a pressure forming process, demolding, and curing to obtain the residue soil-based baking-free light heat-insulating material.
Further, the Baume degree of the magnesium chloride aqueous solution in the step S1 is 22-30; and/or the engineering slag soil crushed to the particle size of less than 4.75mm in the step S3 is adopted.
Further, the water content of the mixture C in the step S4 is 6-18%; and/or the molding pressure of the pressure molding process in the step S5 is 5MPa to 15 MPa.
According to another aspect of the invention, the invention also provides application of the muck-based unfired light thermal insulation material in building thermal insulation building materials.
The invention has the following beneficial effects:
the invention relates to a residue soil base baking-free light thermal insulation material, which comprises: engineering slag soil, inorganic light aggregate, light burned magnesium oxide, magnesium chloride, polymer emulsion, fiber and modifier. Engineering muck is used as a matrix material, inorganic lightweight aggregate is used as aggregate, magnesium oxychloride cement and polymer emulsion are used as cementing materials, and the resource utilization of the engineering muck is realized. The inorganic lightweight aggregate has the advantages of light volume weight and good durability, and can effectively reduce the volume weight of the product, so that the inorganic lightweight aggregate has good heat preservation and heat insulation properties. The magnesium oxychloride cement has strong bonding performance, is very easy to bond with various materials, can effectively solidify engineering slag soil, and obtains a slag soil base non-fired product with high strength; meanwhile, the production period can be shortened because the coagulation and hardening are quicker. The polymer emulsion has good adhesive property and film forming property, and can effectively improve the mechanical strength and waterproof property of the product. The disorderly distributed fibers have a reinforcing effect, so that the bending strength and the tensile strength of the product can be improved, and the toughness of the product can be improved. The modifier can effectively inhibit the halogen return of the magnesium oxychloride cement product. The magnesia oxychloride cement and the polymer emulsion are used as composite cementing materials, and a pressure forming process is adopted to obtain the high-strength slag-soil-based non-fired product under the combined action of chemistry and physics. On the basis, a proper amount of inorganic light aggregate is added, so that the volume weight of the slag-soil-based non-fired product is reduced, and the slag-soil-based non-fired product has good heat preservation and heat insulation properties. The polymer emulsion can form a polymer film in a matrix, has certain flexibility and deformability, and can effectively block capillary channels; the fiber has the effects of strengthening and toughening, and can effectively prevent the generation and the expansion of micro cracks in the matrix; the polymer emulsion and the fiber have synergistic effect to improve the toughness of the product, improve the waterproof performance of the product and overcome the defects of large brittleness and poor water resistance of the magnesium oxychloride cement product. Meanwhile, as the main raw material is inorganic material, the product also has the advantage of fire resistance. The raw materials of the slag-soil-based non-fired light heat-insulating material have synergistic effect, so that the obtained slag-soil-based non-fired light heat-insulating material has the characteristics of light weight, heat preservation, heat insulation and fire resistance, and overcomes the defects of large brittleness and poor water resistance of a magnesium oxychloride cement product. The slag-soil-based baking-free light thermal insulation material can be used for producing thermal insulation materials such as thermal insulation blocks, thermal insulation boards and the like, and can be widely applied to thermal insulation of building walls. The residue soil-based baking-free light thermal insulation material provides a new technical support for resource utilization of engineering residue soil, can consume a large amount of engineering residue soil, improves the resource utilization rate of the residue soil, can develop a new product in the field of novel materials, meets the requirements for building a resource-saving and environment-friendly society, and has better ecological benefit, social benefit and economic benefit.
The residue soil-based baking-free light heat-insulating material is prepared by adding magnesium chloride into water to prepare a magnesium chloride aqueous solution, and then adding a modifier to prepare a mixture A; uniformly stirring inorganic lightweight aggregate and polymer emulsion, and then uniformly stirring the inorganic lightweight aggregate, the polymer emulsion, engineering slag soil, light calcined magnesia and fibers to obtain a mixture B; adding the mixture A into the mixture B in a spraying manner, and uniformly stirring to prepare a mixture C; and (3) filling the mixture C into a mold, adopting a pressure forming process, demolding, and maintaining to obtain the residue soil-based baking-free light heat-insulating material. The inorganic lightweight aggregate and the polymer emulsion are uniformly stirred, so that the polymer emulsion is wrapped on the surface of the inorganic lightweight aggregate, the bonding strength between the inorganic lightweight aggregate and other raw materials can be improved, a formed polymer film can block capillary pipelines, and the waterproof performance of the residue soil-based baking-free lightweight heat-insulating material is improved. The mixture A is added into the mixture B in a spraying mode, and the spraying mode is favorable for uniformly mixing the magnesium chloride aqueous solution and the modifier into the engineering muck so as to solve the problem that the engineering muck is difficult to be uniformly mixed with other raw materials due to high viscosity. The preparation process of the slag-soil-based baking-free light heat-insulating material is simple, the required production field is small, and the production period is short; by adopting a sintering-free process, a large amount of energy can be saved, and the method is low-carbon and environment-friendly. Therefore, the preparation method of the slag-based baking-free light heat-insulating material has the characteristics of simple preparation process, sintering-free property, small production investment and the like.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail with reference to examples.
The residue soil-based baking-free light heat-insulating material comprises the following components in parts by mass: the engineering slag soil comprises 80 to 100 portions of dry weight, 15 to 65 portions of inorganic light aggregate, 5 to 30 portions of light calcined magnesia, 1 to 15 portions of magnesium chloride, 3 to 10 portions of polymer emulsion, 0.2 to 1.5 portions of fiber and 0.1 to 1.5 portions of modifier.
The invention relates to a residue soil base baking-free light thermal insulation material, which comprises: engineering slag soil, inorganic light aggregate, light burned magnesium oxide, magnesium chloride, polymer emulsion, fiber and modifier. Engineering muck is used as a matrix material, inorganic lightweight aggregate is used as aggregate, magnesium oxychloride cement and polymer emulsion are used as cementing materials, and the resource utilization of the engineering muck is realized. The inorganic lightweight aggregate has the advantages of light volume weight and good durability, and can effectively reduce the volume weight of the product, so that the inorganic lightweight aggregate has good heat preservation and heat insulation properties. The magnesium oxychloride cement has strong bonding performance, is very easy to bond with various materials, can effectively solidify engineering slag soil, and obtains a slag soil base non-fired product with high strength; meanwhile, the production period can be shortened because the coagulation and hardening are quicker. The polymer emulsion has good adhesive property and film forming property, and can effectively improve the mechanical strength and waterproof property of the product. The disorderly distributed fibers have a reinforcing effect, so that the bending strength and the tensile strength of the product can be improved, and the toughness of the product can be improved. The modifier can effectively inhibit the halogen return of the magnesium oxychloride cement product. The magnesia oxychloride cement and the polymer emulsion are used as composite cementing materials, and a pressure forming process is adopted to obtain the high-strength slag-soil-based non-fired product under the combined action of chemistry and physics. On the basis, a proper amount of inorganic light aggregate is added, so that the volume weight of the slag-soil-based non-fired product is reduced, and the slag-soil-based non-fired product has good heat preservation and heat insulation properties. The polymer emulsion can form a polymer film in a matrix, has certain flexibility and deformability, and can effectively block capillary channels; the fiber has the effects of strengthening and toughening, and can effectively prevent the generation and the expansion of micro cracks in the matrix; the polymer emulsion and the fiber have synergistic effect to improve the toughness of the product, improve the waterproof performance of the product and overcome the defects of large brittleness and poor water resistance of the magnesium oxychloride cement product. Meanwhile, as the main raw material is inorganic material, the product also has the advantage of fire resistance. The raw materials of the slag-soil-based non-fired light heat-insulating material have synergistic effect, so that the obtained slag-soil-based non-fired light heat-insulating material has the characteristics of light weight, heat preservation, heat insulation and fire resistance, and overcomes the defects of large brittleness and poor water resistance of a magnesium oxychloride cement product. The slag-soil-based baking-free light thermal insulation material can be used for producing thermal insulation materials such as thermal insulation blocks, thermal insulation boards and the like, and can be widely applied to thermal insulation of building walls. The residue soil-based baking-free light thermal insulation material provides a new technical support for resource utilization of engineering residue soil, can consume a large amount of engineering residue soil, improves the resource utilization rate of the residue soil, can develop a new product in the field of novel materials, meets the requirements for building a resource-saving and environment-friendly society, and has better ecological benefit, social benefit and economic benefit.
The engineering muck is soil muck generated by foundation pit excavation or underground engineering construction. Because the main component of the engineering muck is clay, the water content and the viscosity of the engineering muck are higher, the resource utilization difficulty is higher. The light-burned magnesium oxide and magnesium chloride are main raw materials of magnesium oxychloride cement, and the magnesium oxychloride cement has strong bonding performance, is very easy to bond with various materials, can be quickly coagulated and hardened under the condition of normal temperature and pressure maintenance, and can form a product with higher strength. Compared with the traditional cementing materials (cement, lime and the like), under the condition of the same mixing amount, the mechanical strength of the product is higher, and the time required by setting and hardening is shorter, so that the slag-soil-based non-fired light thermal insulation material with higher strength can be prepared by adopting the magnesium oxychloride cement to cure the engineering slag soil, and the production period is shorter. The residue soil-based baking-free light heat-insulating material is prepared by solidifying engineering residue soil by adopting magnesium oxychloride cement, the occupation ratio of the engineering residue soil is up to 50-80%, and the higher utilization ratio of the engineering residue soil is realized. However, the volume weight of the slag-based non-fired solid building material product is relatively large (the volume weight of the press-molded product is 2000 kg/m)3About 1800kg/m of casting molding product3Left and right) can only be applied to bearing walls in building walls, because ofAnd limits the application range of the building wall. The invention reduces the volume weight of the slag-soil-based non-fired product by adding the inorganic light aggregate, and ensures that the slag-soil-based non-fired product has the functions of heat preservation and heat insulation, and the dry density of the slag-soil-based non-fired product is lower than 1000kg/m3The performance indexes such as dry density, thermal conductivity coefficient, compressive strength and the like can meet the relevant regulations of GB/T11968-2020 autoclaved aerated concrete block; meanwhile, the adopted raw materials are mainly inorganic materials, so that the residue soil-based non-fired light heat-insulating material has the advantage of fire resistance, the combustion performance grade is A grade, and the residue soil-based non-fired light heat-insulating material is a non-combustible material. Therefore, the residue soil-based baking-free light heat-insulating material can improve the fire safety of buildings.
In the embodiment, the engineering muck comprises 85 to 95 parts by dry weight, 15 to 65 parts by dry weight of inorganic light aggregate, 8 to 25 parts by dry weight of light-burned magnesia, 2 to 9 parts by dry weight of magnesium chloride, 5 to 8 parts by dry weight of polymer emulsion, 0.2 to 1.0 part by dry weight of fiber and 0.3 to 1.0 part by dry weight of modifier. The residue soil-based baking-free light heat-insulating material obtained by the proportion has higher compressive strength and lower heat conductivity coefficient under the condition of the same volume weight. More preferably, the engineering slag soil comprises 85 to 95 parts by dry weight of inorganic light aggregate 15 to 65 parts by dry weight of light burned magnesium oxide 10 to 20 parts by dry weight of inorganic light aggregate, 3 to 6 parts by dry weight of magnesium chloride, 5 to 8 parts by dry weight of polymer emulsion, 0.3 to 0.6 part by dry weight of fiber and 0.3 to 0.6 part by dry weight of modifier.
In this embodiment, the engineering muck is soil-like muck generated by excavation of a foundation pit or construction of an underground engineering. And/or the water content of the engineering muck is lower than 3 percent. The residue soil-based baking-free light heat-insulating material is prepared by taking engineering residue soil as a matrix material, wherein the engineering residue soil is soil-based residue soil. The slag-soil-based baking-free light thermal insulation material can be used for producing building thermal insulation materials such as thermal insulation blocks, thermal insulation boards and the like, and can be widely applied to thermal insulation of building walls. The water content of the engineering muck is lower than 3%. The main component of the engineering muck is clay which has high water content and high viscosity and is difficult to be uniformly mixed with other raw materials. After the engineering slag soil is air-dried or dried, the engineering slag soil is beneficial to carrying out crushing treatment and uniformly mixing with other raw materials.
In this embodiment, the inorganic lightweight aggregate is at least one of expanded perlite and vitrified micro beads. And/or, inorganic light-weightThe bulk density of the material is not more than 120kg/m3. The inorganic light aggregate is at least one of expanded perlite and vitrified micro bubbles, and the expanded perlite and vitrified micro bubbles are taken as light aggregate, so that the inorganic light aggregate has the characteristics of light volume weight, small heat conductivity coefficient, no combustion, good durability and the like, can effectively reduce the volume weight of building material products, has the characteristics of good heat preservation, heat insulation, fire prevention and the like, and overcomes the defects of easy combustion of EPX and XPS plates, harmful gas generation at high temperature, poor aging resistance and weather resistance and the like. The inorganic lightweight aggregate has a bulk density of not more than 120kg/m3. The smaller the bulk density of the inorganic lightweight aggregate is, the smaller the thermal conductivity thereof is. When the inorganic lightweight aggregate bulk density is not more than 120kg/m3In the process, the residue soil-based baking-free light thermal insulation material with lower dry density grade and smaller heat conductivity coefficient can be prepared.
In this embodiment, the polymer emulsion is at least one of a VAE emulsion and a polyvinyl alcohol emulsion. And/or the solid content of the polymer emulsion is more than or equal to 50 percent. The VAE emulsion and the polyvinyl alcohol emulsion have good adhesive property, can improve the adhesive strength among raw materials, and improve the mechanical strength of the slag-based baking-free light thermal insulation material under the synergistic effect with magnesium oxychloride cement; meanwhile, the VAE emulsion and the polyvinyl alcohol emulsion also have good film forming characteristics, and the formed polymer film can effectively block capillary pipelines and improve the waterproof performance of the residue soil-based baking-free light heat-insulating material. The solid content of the polymer emulsion is controlled to be more than or equal to 50 percent, so that the polymer emulsion can have better adhesive property and film-forming property.
In this embodiment, the fiber is at least one of a crop straw fiber and a polypropylene fiber. And/or the length of the fibres does not exceed 20 mm. The fiber can improve the cracking resistance of the slag-soil-based non-fired light heat-insulating material and overcome the defect of large brittleness of a magnesium oxychloride cement product. The length of the fiber is not more than 20mm, which is beneficial to the uniform dispersion of the fiber in the mixture, thereby more effectively preventing the generation and the expansion of micro-cracks in the matrix, improving the anti-cracking performance of the product and obviously improving the toughness of the product.
In this embodiment, the modifier is at least one of phosphate, sulfate, phosphoric acid, or silicon powder. The modifier can effectively inhibit the halogen return of the magnesium oxychloride cement product.
According to another aspect of the invention, the preparation method of the slag-soil based baking-free light thermal insulation material comprises the following steps:
s1, adding magnesium chloride into water, and uniformly stirring to obtain a magnesium chloride aqueous solution;
s2, adding a modifier into the magnesium chloride aqueous solution obtained in the step S1, and uniformly stirring to obtain a mixture A;
s3, uniformly stirring the inorganic lightweight aggregate and the polymer emulsion, and uniformly stirring the inorganic lightweight aggregate, the polymer emulsion, the engineering slag soil, the light burned magnesium oxide and the fibers to obtain a mixture B;
s4, adding the mixture A obtained in the step S2 into the mixture B obtained in the step S3 in a spraying mode, and uniformly stirring to obtain a mixture C;
s5, filling the mixture C obtained in the step S4 into a mold, adopting a pressure forming process, demolding, and curing to obtain the residue soil-based baking-free light heat-insulating material.
The residue soil-based baking-free light heat-insulating material is prepared by adding magnesium chloride into water to prepare a magnesium chloride aqueous solution, and then adding a modifier to prepare a mixture A; uniformly stirring inorganic lightweight aggregate and polymer emulsion, and then uniformly stirring the inorganic lightweight aggregate, the polymer emulsion, engineering slag soil, light calcined magnesia and fibers to obtain a mixture B; adding the mixture A into the mixture B in a spraying manner, and uniformly stirring to prepare a mixture C; and (3) filling the mixture C into a mold, adopting a pressure forming process, demolding, and maintaining to obtain the residue soil-based baking-free light heat-insulating material. The inorganic lightweight aggregate and the polymer emulsion are uniformly stirred, so that the polymer emulsion is wrapped on the surface of the inorganic lightweight aggregate, the bonding strength between the inorganic lightweight aggregate and other raw materials can be improved, a formed polymer film can block capillary pipelines, and the waterproof performance of the residue soil-based baking-free lightweight heat-insulating material is improved. The mixture A is added into the mixture B in a spraying mode, the spraying mode is favorable for uniformly mixing the magnesium chloride aqueous solution and the modifier into the engineering muck, and the problem that the engineering muck is difficult to uniformly mix with other raw materials due to high viscosity is solved. The preparation process of the slag-soil-based baking-free light heat-insulating material is simple, the required production field is small, and the production period is short; by adopting a sintering-free process, a large amount of energy can be saved, and the method is low-carbon and environment-friendly. Therefore, the preparation method of the slag-based baking-free light heat-insulating material has the characteristics of simple preparation process, sintering-free property, small production investment and the like.
In this embodiment, the engineering slag soil in step S3 is crushed into particles with a particle size of less than 4.75 mm. The engineering slag soil usually contains large broken stones, and the particle size of the broken stones affects the forming and the performance of products. The engineering slag soil is crushed by the double-roller machine, so that the particle size of the engineering slag soil is kept in a reasonable range, the homogeneity of the engineering slag soil particles is improved, and the stability of the performance of the slag soil-based baking-free light heat-insulating material is favorably ensured. The magnesium oxychloride cement and the polymer emulsion are used as composite cementing materials, the expanded perlite and the vitrified micro bubbles are used as aggregates, and the engineering muck is used as a base material, so that the prepared muck-based non-fired light thermal insulation material is mainly used for producing building materials such as thermal insulation blocks, thermal insulation boards and the like, the size of the product is smaller, the particle size of engineering muck particles is controlled to be smaller than 4.75mm, and the product can be ensured to be easy to form and stable in performance.
In this embodiment, the Baume degree of the magnesium chloride aqueous solution in step S1 is 22-30. The magnesium chloride is an important component material of magnesium oxychloride cement. The magnesium oxychloride cement is prepared by using light calcined powder obtained by calcining magnesite or ash (main component is MgO) obtained by calcining dolomite at low temperature, and using magnesium chloride hexahydrate (MgCl)2·6H2O) or the like as a blending agent, and water is added thereto to form a hardened cement. The test result shows that the magnesium oxychloride cement hydration product mainly comprises 518 phases, Mg (OH)2When the additive is used as a supplement, the properties of the hardened body are optimal. The baume degree of the magnesium chloride aqueous solution is 22-30, and MgO/MgCl2The molar ratio of (a) is 5-13, 518 phases in a hydration product account for more, and Mg (OH)2The ratio is less, and the strength of a hardened body is higher.
In this embodiment, the water content of the mixture C in step S4 is 6% to 18%. The optimal moisture content exists in the engineering muck mixture formed under pressure, the maximum dry density and the higher limit pressure can be obtained under the condition of the optimal moisture content, and then the muck-based baking-free light heat-insulating material with higher strength is obtained. Meanwhile, the optimum baume degree of the magnesium chloride is 22-30, and the water content of the mixture is limited. Test results show that when the water content is 6-18%, the slag-soil-based unburned light heat-insulating material can be molded under high pressure to obtain a compact slag-soil-based blank, and magnesium chloride can react under a high baume degree to obtain a high-strength slag-soil-based unburned light heat-insulating material under physical and chemical synergistic effects.
In this embodiment, the molding pressure of the pressure molding process in step S5 is 5MPa to 15 MPa. The pressure forming process is adopted, the ultimate pressure is different in different grain compositions and mixing ratios, and when the pressure exceeds the ultimate pressure, the reinforcing effect cannot be achieved, and the blank body can be damaged. The invention adopts the inorganic light aggregate to reduce the volume weight of the residue soil-based non-fired light heat-insulating material, so that the residue soil-based non-fired light heat-insulating material has the characteristics of heat insulation and heat insulation. However, since the compressive strength of the lightweight aggregate is low, when the forming pressure is too high, the porous structure is damaged due to excessive compression, and the thermal insulation performance of the residue-based non-fired lightweight thermal insulation material is reduced. Therefore, the optimal molding pressure is determined by comprehensively considering the mechanical strength and the heat conductivity coefficient of the residue soil-based non-fired light heat-insulating material, and the molding pressure range is 5MPa to 15 MPa.
According to another aspect of the invention, the invention also provides application of the muck-based unfired light thermal insulation material in building thermal insulation building materials. The material is particularly applied to wall heat-insulating materials such as heat-insulating building blocks, heat-insulating plates and the like.
Examples
Example 1
The residue soil-based baking-free light heat-insulating material comprises the following components in parts by mass: 100 parts of engineering slag soil by dry weight, 15 parts of expanded perlite, 8 parts of light burned magnesium oxide, 2 parts of magnesium chloride, 3 parts of VAE emulsion, 0.4 part of crop straw fiber and 0.5 part of sodium phosphate.
The preparation method of the slag-based baking-free light thermal insulation material comprises the following steps:
s1, adding magnesium chloride into water, and uniformly stirring to obtain a magnesium chloride solution with a Baume degree of 22;
s2, adding sodium phosphate into the magnesium chloride solution obtained in the step S1, and uniformly stirring to obtain a mixture A;
s3, firstly, drying or air-drying the engineering muck until the water content is lower than 3%, then crushing the engineering muck until the particle size is smaller than 4.75mm, then uniformly stirring the expanded perlite and the VAE emulsion, and then uniformly stirring the expanded perlite, the light burned magnesium oxide and the crop straw fiber to prepare a mixture B;
s4, adding the mixture A obtained in the step S2 into the mixture B obtained in the step S3 in a spraying mode, and uniformly stirring to obtain a mixture C, wherein the water content of the mixture C is 10%;
s5, filling the mixture C obtained in the step S4 into a die, forming in a hydraulic press with the pressure of 12MPa, demolding, and naturally curing to obtain the residue soil-based baking-free light heat-insulating material.
Example 2
The residue soil-based baking-free light heat-insulating material comprises the following components in parts by mass: 100 parts of engineering slag soil by dry weight, 24 parts of expanded perlite, 12 parts of light burned magnesium oxide, 4 parts of magnesium chloride, 5 parts of polyvinyl alcohol emulsion, 0.6 part of polypropylene fiber and 0.6 part of phosphoric acid.
The preparation method of the slag-based baking-free light thermal insulation material comprises the following steps:
s1, adding magnesium chloride into water, and uniformly stirring to obtain a magnesium chloride solution with a Baume degree of 25;
s2, adding phosphoric acid into the magnesium chloride solution obtained in the step S1, and uniformly stirring to obtain a mixture A;
s3, firstly, drying or air-drying the engineering muck until the water content is lower than 3%, then crushing the engineering muck until the particle size is smaller than 4.75mm, then uniformly stirring the expanded perlite and the polyvinyl alcohol emulsion, and then uniformly stirring the expanded perlite, the light burned magnesium oxide and the polypropylene fiber to prepare a mixture B;
s4, adding the mixture A obtained in the step S2 into the mixture B obtained in the step S3 in a spraying mode, and uniformly stirring to obtain a mixture C, wherein the water content of the mixture C is 12%;
s5, filling the mixture C obtained in the step S4 into a die, forming in a hydraulic press with the pressure of 10MPa, and naturally curing after demolding to obtain the residue soil-based baking-free light heat-insulating material.
Example 3
The residue soil-based baking-free light heat-insulating material comprises the following components in parts by mass: 100 parts of engineering slag soil by dry weight, 42 parts of vitrified micro bubbles, 20 parts of light burned magnesium oxide, 6 parts of magnesium chloride, 8 parts of polyvinyl alcohol emulsion, 0.8 part of polypropylene fiber and 0.8 part of sodium phosphate.
The preparation method of the slag-based baking-free light thermal insulation material comprises the following steps:
s1, adding magnesium chloride into water, and uniformly stirring to obtain a magnesium chloride solution with a Baume degree of 30;
s2, adding sodium phosphate into the magnesium chloride solution obtained in the step S1, and uniformly stirring to obtain a mixture A;
s3, firstly, drying or air-drying the engineering muck until the water content is lower than 3%, crushing until the particle size is smaller than 4.75mm, then, uniformly stirring the vitrified micro bubbles and the polyvinyl alcohol emulsion, and then, uniformly stirring the vitrified micro bubbles, the engineering muck, the light burned magnesium oxide and the polypropylene fiber to prepare a mixture B;
s4, adding the mixture A obtained in the step S2 into the mixture B obtained in the step S3 in a spraying mode, and uniformly stirring to obtain a mixture C, wherein the water content of the mixture C is 13%;
s5, filling the mixture C obtained in the step S4 into a die, forming in a hydraulic press with the pressure of 8MPa, and naturally curing after demolding to obtain the residue soil-based baking-free light heat-insulating material.
The dry density, compressive strength and thermal conductivity coefficient of the residue soil-based unfired light thermal insulation material prepared in the above examples 1, 2 and 3 were tested according to the test method of autoclaved aerated concrete block (GB/T11968-Buck 2020).
The test results are shown in table 1.
TABLE 1 test results of examples 1 to 3
As can be seen from Table 1, the addition of a proper amount of inorganic lightweight aggregate can significantly reduce the volume weight of the slag-based non-fired product, and make the slag-based non-fired product have good heat preservation and heat insulation properties. With the increase of the mixing amount of the inorganic light aggregate, the dry density and the heat conductivity coefficient of the slag-based unfired light heat-insulating material are gradually reduced, the compressive strength is reduced, but the compressive strength and the heat conductivity coefficient are superior to the requirements of dry density grades B04, B05 and B06 in autoclaved aerated concrete block (GB/T11968-. Therefore, the engineering muck is used as a matrix material, the inorganic light aggregate is used as an aggregate, the magnesium oxychloride cement and the polymer emulsion are used as a composite cementing material, and the prepared muck-based non-fired light heat-insulating material has the characteristics of light weight, heat preservation and heat insulation, has the advantage of fire resistance because the main raw materials are inorganic materials, can meet the requirements of wall heat preservation and heat insulation, can improve the fire resistance safety of buildings, and has wide application prospect. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
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