CN115385653A - Papermaking deinking sludge-based gel material and preparation method and application thereof - Google Patents

Papermaking deinking sludge-based gel material and preparation method and application thereof Download PDF

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Publication number
CN115385653A
CN115385653A CN202210492813.1A CN202210492813A CN115385653A CN 115385653 A CN115385653 A CN 115385653A CN 202210492813 A CN202210492813 A CN 202210492813A CN 115385653 A CN115385653 A CN 115385653A
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sludge
deinking sludge
paper
gel material
powder
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周锦霞
唐昊
刘浩
孙成武
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Anhui Yuezhi Huiyuan Biotechnology Co ltd
South China University of Technology SCUT
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Anhui Yuezhi Huiyuan Biotechnology Co ltd
South China University of Technology SCUT
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/30—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 magnesium cements or similar cements
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/92—Protection against other undesired influences or dangers
    • E04B1/94—Protection against other undesired influences or dangers against fire
    • E04B1/941—Building elements specially adapted therefor
    • E04B1/942—Building elements specially adapted therefor slab-shaped
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B2/00—Walls, e.g. partitions, for buildings; Wall construction with regard to insulation; Connections specially adapted to walls
    • E04B2/74—Removable non-load-bearing partitions; Partitions with a free upper edge
    • 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
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength

Abstract

The invention provides a paper-making deinking sludge-based gel material and a preparation method and application thereof. The method comprises the following steps: drying deinking sludge from paper mill at 105 deg.c to constant weight, crushing and sieving; taking a proper amount of deinking sludge powder, 85 light calcined powder/magnesium oxide and lignin, uniformly mixing, adding a proper amount of magnesium salt solution, uniformly stirring, pouring into a mold, and cooling and solidifying to obtain the deinking sludge-based gelling material. The minimum density of the deinking sludge-based cementing material reaches 1.138g/cm 3 The bending strength is up to 42.25Mpa, the compression strength is up to 11.66Mpa, the contact angle is up to 90.65 DEG, and the mass loss rate of 30min of muffle furnace calcination at 450 ℃ is 27.52% at minimum. The inventionCan provide a new resource utilization mode for the waste deinking sludge, has simple preparation process and required equipment, and has very good environmental benefit and economic benefit.

Description

Papermaking deinking sludge-based gel material and preparation method and application thereof
Technical Field
The invention relates to the field of papermaking sludge recycling technology and environmental protection, in particular to a papermaking deinking sludge hydrogel material and a preparation method and application thereof
Background
With the rapid development of the paper making industry, the industry also becomes one of the main industries polluting the environment in China. In recent years, the recovery rate of waste paper in China is increased year by year; in 2019, the recovery rate of waste paper in China is 49%, in 2020, the recovery rate of waste paper in China is 65.7%, in 2021, the recovery rate of waste paper in China is as high as 90%. A large amount of deinking sludge is generated in the process of pulping waste paper, and the deinking sludge is solid waste residue generated in the process of flotation and deinking of recycled fiber pulp. The chemical components of the waste paper deinking sludge are complex, organic matters account for 70-90 percent, and inorganic matters and metal impurities account for 10-30 percent; the organic matters mainly comprise plastics, fine fibers, broken cloth, cotton yarns, various organic pigments from printing ink, additives and the like. At present, sludge treatment modes mainly include landfill, incineration and the like, a large amount of land is occupied for the landfill, a small amount of heavy metal elements contained in the sludge can be accumulated and pollute the land, and the seriously polluted land is hardly reused. If the deinking sludge cannot be properly treated, serious environmental pollution will be caused. If the material is incinerated, toxic substances such as dioxin and the like are generated in the incineration process. Therefore, the exploration of a deinking sludge resource utilization way is the key for solving the problem of producing a large amount of deinking sludge in the production process of recycled fiber pulp.
Liu zhong and the like disclose a method for preparing activated carbon by utilizing papermaking deinking sludge, which comprises the steps of drying and crushing the deinking sludge, mixing the deinking sludge with peanut shells and zinc chloride, and preparing the deinking sludge-based activated carbon through a series of processes. The method can utilize the waste sludge as resources, has good environmental benefit and economic benefit, but has complex process, needs a large amount of hydrochloric acid in the process, and is not environment-friendly from another aspect (the patent number is CN 201610595303.1). Yuyongqing and the like disclose a preparation process for preparing foaming filler by utilizing deinked sludge, which recycles the deinked sludge, effectively reduces the production cost and plays a great role in improving the ecological environment. The preparation process is complex, and the large-scale utilization of the deinking sludge has disadvantages (patent number: CN 201310151347.1).
Disclosure of Invention
The invention aims to provide a preparation method and application of a papermaking deinking sludge cementing material. Aiming at the defects of the prior art, the method for producing the gelled material by utilizing the deinked sludge, the magnesium oxide and the magnesium salt is provided, the process steps and the required equipment are simple, the preparation process does not need to be fired, the self-crosslinking coagulation can be carried out in a low-temperature environment, the production cost is low, and the economic benefit and the environmental benefit are higher. The prepared deinking sludge cementing material has the advantages of low density, high strength and good flame retardant property. The invention can provide a new resource utilization mode for the waste deinking sludge, has simple preparation process and required equipment, and has very good environmental benefit and economic benefit.
The purpose of the invention is realized by the following technical scheme:
a preparation method of a paper-making deinking sludge hydrogel material comprises the following steps:
(1) Drying deinking sludge collected from a paper mill in a drying oven at 105 ℃ to be absolutely dry, crushing, and sieving by a sieve of 50-100 meshes;
(2) Preparing 20-25 wt% magnesium salt solution and 8-12 wt% polycaprolactone solution;
(3) Uniformly stirring and mixing 10-40 wt% of papermaking deinking sludge powder, 10-40 wt% of 85 light burning powder/magnesium oxide and 1-5 wt% of lignin;
(4) Adding 40-55 wt% of the magnesium sulfate solution prepared in the step (2) into the uniformly stirred mixed powder in the step (3), and uniformly stirring and mixing;
(5) And (4) pouring the uniformly mixed material in the step (4) into a mould, and drying at the temperature of 35-45 ℃.
Preferably, the deinking sludge in the step (1) is crushed and sieved by a 60-mesh sieve;
preferably, the concentration of the magnesium salt in the step (2) is 23.3wt%, and the concentration of the polycaprolactone solution is 4wt%;
preferably, the deinking sludge powder, 85 light-burned powder and lignin in the step (3) account for 39wt% of the deinking sludge powder, 58wt% of the 85 light-burned powder and 3wt% of the lignin;
preferably, the amount of the magnesium sulfate solution added in the step (4) is 23.3wt%;
preferably, the drying temperature of the cementing material in the step (5) is 37 ℃.
The papermaking deinking sludge hydrogel material is applied to preparing building material; the building material comprises a fireproof plate or a light partition wall.
Compared with the prior art, the invention has the beneficial effects that:
1. the gelled material prepared by the deinking sludge does not need to be calcined at high temperature, can be spontaneously crosslinked and coagulated at natural temperature, has short production period and higher economic benefit and environmental benefit.
2. The gel material prepared by taking deinked sludge as a main material and 85 light calcined powder/magnesium oxide, magnesium sulfate/magnesium chloride and lignin as auxiliary materials has excellent performance, and the lowest density is 1.138g/cm 3 The contact angle reaches 90.65 degrees at most, the waterproof performance is good, the bending strength reaches 42.25Mpa, the compressive strength reaches 11.71Mpa, and the minimum mass loss rate of the muffle furnace after being calcined at 450 ℃ for 30min is 27.52 percent.
3. Different from the traditional cement product curing, the deinked sludge-based cementing material has good water retention property, does not need additional watering curing, and can obtain a baking-free cured product through natural drying and standing curing.
4. The minimum density of the deinking sludge-based cementing material reaches 1.138g/cm 3 The bending strength is up to 42.25Mpa, the compression strength is up to 11.66Mpa, the contact angle is up to 90.65 DEG, and the mass loss rate of 30min of muffle furnace calcination at 450 ℃ is 27.52% at minimum.
Drawings
FIG. 1 is a sectional electron microscope image of a deinked sludge material;
FIG. 2 is a histogram of contact angles of 10wt% polycaprolactone coated with different numbers of layers;
FIG. 3 is a graph of the contact angle of deinking sludge gel material added;
FIG. 4 is a contact angle diagram of pure 85 light calcined powder cementing material;
FIG. 5 contact angle plot of deinking sludge-based cementitious material coated with polycaprolactone solution.
Detailed Description
The present invention is further illustrated by the following examples.
A preparation method of a paper-making deinking sludge-based gel material comprises the following steps:
1) Uniformly stirring and mixing papermaking deinking sludge powder, active materials and lignin;
the active material is magnesium oxide analytically pure or 85 light calcined powder;
2) Adding the magnesium salt solution, stirring uniformly, pouring into a mold, and drying to obtain a gelling agent material;
3) Coating the polycaprolactone solution on the surface of the gelling agent material, and naturally drying.
The preparation method of the papermaking deinking sludge powder comprises the following steps: drying deinking sludge collected from a paper mill in a 105 ℃ oven to be absolutely dry, crushing, and sieving by a 50-100 mesh sieve, preferably 60-80 mesh.
In the step 3), the coating weight is 0.05mL/cm 2 The number of coating times is 1 to 7.
In the step 1), the lignin is bamboo alkali lignin.
In the step 2), the drying temperature is 30-45 ℃.
The papermaking sludge cementing material comprises 10-40 wt% of papermaking deinking sludge powder, 40-55 wt% of magnesium salt solution, 10-40 wt% of magnesium oxide, 1-5 wt% of lignin and 8-12 wt% of polycaprolactone solution;
the magnesium salt solution is magnesium sulfate solution or magnesium chloride solution. The concentration of the magnesium salt solution is 21-25 wt%.
Example 1
(1) Drying the deinked sludge in a 105 ℃ oven to be absolutely dry, crushing, sieving by a 60-mesh sieve, and collecting sludge powder;
(2) The activity of magnesium oxide of 85 light burning powder (purchased from the Liaoning ocean high-tech materials Co., ltd.) was tested;
(3) Preparing 23.3wt% magnesium sulfate solution;
(4) And (2) uniformly mixing 100g of deinked sludge powder, 10085 g of light-burned powder and 2g of lignin in the step (1), then adding 23.3wt% of magnesium sulfate solution prepared in the step (3) in batches, uniformly stirring, then loading the sludge into a mold, cooling, solidifying, demolding and drying at 40 ℃. The cross-sectional electron microscope image of the deinked sludge-based gelling material is shown in FIG. 1. The bending strength is 16.12Mpa, the compression strength is 6.32Mpa, the contact angle is 48.84 degrees, and the density is 1.382kg/m 3 And the mass loss rate after the material is calcined in a muffle furnace for 30min at the temperature of 450 ℃ is 31.80 percent.
Example 2
(1) Drying the deinked sludge in a 105 ℃ oven to be completely dry, crushing, sieving by a 50-mesh sieve, and collecting sludge powder;
(2) Preparing 21wt% magnesium sulfate solution;
(3) Uniformly mixing 133.3g of deinked sludge powder, 66.7g of light burning powder and 10g of lignin in the step (1), then adding the 21wt% solution prepared in the step (3) in batches, uniformly stirring, then loading the sludge into a mold, cooling and solidifying, demolding, and drying at 37 ℃. The bending strength and the compression strength of the steel plate are tested to be 25.38Mpa, 4.38Mpa, the contact angle is 54.88 degrees (the contact angle is shown in figure 3), and the density is 1.138g/cm 3 And the mass loss rate of the material after being calcined in a muffle furnace for 30min at the temperature of 450 ℃ is 33.52 percent.
Example 3
(1) Drying the deinked sludge in a 105 ℃ oven to be absolutely dry, crushing, sieving by a 100-mesh sieve, and collecting sludge powder;
(2) Preparing 25wt% magnesium sulfate solution;
(3) And (2) uniformly mixing 80g of deinked sludge powder, 120 85 g of light burning powder and 6g of lignin in the step (1), then adding 25wt% of the solution prepared in the step (3) in batches, uniformly stirring, then loading the sludge into a mold, cooling, solidifying, demolding and drying at the temperature of 30 ℃. The bending strength is 38.22Mpa, the compression strength is 8.89Mpa, the contact angle is 37.98 degrees, and the density is 1.506g/cm 3 And the mass loss rate after the material is calcined in a muffle furnace for 30min at the temperature of 450 ℃ is 33.5 percent.
Example 4
(1) Drying the deinked sludge in a 105 ℃ oven to be completely dry, crushing, sieving by a 60-mesh sieve, and collecting sludge powder;
(2) Preparing 23.3wt% magnesium chloride solution;
(3) And (2) uniformly mixing 100g of deinked sludge powder obtained in the step (1), 100g of magnesium oxide and 2g of lignin, then adding 23.3wt% of solution prepared in the step (2) in batches, uniformly stirring, then loading the sludge into a mold, cooling and solidifying, demolding, and drying at 40 ℃. The bending strength is 31.5Mpa, the compression strength is 7.72Mpa, the contact angle is 33.7 degrees, and the density is 2.373g/cm 3 And the mass loss rate after the material is calcined in a muffle furnace for 30min at the temperature of 450 ℃ is 28.07 percent.
Example 5
(1) Drying the deinked sludge in a 105 ℃ oven to be absolutely dry, crushing, sieving by a 60-mesh sieve, and collecting sludge powder;
(2) Preparing 21wt% magnesium chloride solution;
(3) And (2) uniformly mixing 133.3g of deinked sludge powder obtained in the step (1), 66.7g of magnesium oxide and 10g of lignin, then adding the 21wt% solution prepared in the step (2) in batches, uniformly stirring, then loading the sludge into a mold, cooling, solidifying, demolding and drying at 40 ℃. The bending strength is 36.28Mpa, the compression strength is 6.02Mpa, the contact angle is 58.1 degrees, and the density is 1.451g/cm 3 And the mass loss rate after the material is calcined in a muffle furnace for 30min at the temperature of 450 ℃ is 31.05 percent.
Example 6
(1) Drying the deinked sludge in a 105 ℃ oven to be absolutely dry, crushing, sieving by a 80-mesh sieve, and collecting sludge powder;
(2) Preparing 25wt% magnesium chloride solution;
(3) And (2) uniformly mixing 66.7g of deinked sludge powder obtained in the step (1), 133.3g of magnesium oxide and 6g of lignin, then adding the 25wt% solution prepared in the step (2) in batches, uniformly stirring, then loading the sludge into a mold, cooling, solidifying, demolding and drying at 40 ℃. The bending strength is 42.3Mpa, the compression strength is 11.66Mpa, the contact angle is 27.25 degrees, and the density is 1.612g/cm 3 And the mass loss rate after the material is calcined in a muffle furnace for 30min at the temperature of 450 ℃ is 28.56 percent.
Example 7
(1) Drying the deinked sludge in a 105 ℃ oven to be completely dry, crushing, sieving by a 60-mesh sieve, and collecting sludge powder;
(2) Preparing 23.3wt% magnesium sulfate solution;
(3) And (2) uniformly mixing 150g of deinked sludge powder, 50g of 85 light burning powder and 6g of lignin in the step (1), then adding the 23.3wt% solution prepared in the step (2) in batches, uniformly stirring, then loading the sludge into a mold, cooling and solidifying, demolding, and drying at 37 ℃. The bending strength is 12.84Mpa, the compression strength is 2.56Mpa, the contact angle is 30.68 degrees, and the density is 1.259g/cm 3 And the mass loss rate is 31.81 percent after the material is calcined for 30min in a muffle furnace at the temperature of 450 ℃.
Example 8
(1) Drying the deinked sludge in a 105 ℃ oven to be completely dry, crushing, sieving by a 60-mesh sieve, and collecting sludge powder;
(2) Preparing 23.3wt% magnesium sulfate solution;
(3) And (2) uniformly mixing 66.7g of deinked sludge powder, 133.3g of 85 light calcined powder and 10g of lignin in the step (1), then adding the 23.3wt% solution prepared in the step (2) in batches, uniformly stirring, then loading the sludge into a mold, cooling, solidifying, demolding and drying at 37 ℃. The bending strength is 27.08Mpa, the compression strength is 9.72Mpa, the contact angle is 39 degrees, and the density is 1.393g/cm 3 And the mass loss rate after the material is calcined in a muffle furnace for 30min at the temperature of 450 ℃ is 34.86 percent.
Example 9
(1) Drying the deinked sludge in a 105 ℃ oven to be absolutely dry, crushing, sieving by a 60-mesh sieve, and collecting sludge powder;
(2) Preparing 23.3wt% magnesium sulfate solution;
(3) And (2) uniformly mixing 100g of deinked sludge powder, 10085 g of light-burned powder and 6g of lignin in the step (1), then adding 23.3wt% of solution prepared in the step (2) in batches, uniformly stirring, then loading the sludge into a mold, cooling, solidifying, demolding and drying at 37 ℃. The bending strength is 22.54Mpa, the compression strength is 5.08Mpa, the contact angle is 61.38 degrees, and the density is 1.307g/cm 3 And the mass loss rate after the material is calcined in a muffle furnace for 30min at the temperature of 450 ℃ is 33.44 percent.
Example 10
(1) Drying the deinked sludge in a 105 ℃ oven to be absolutely dry, crushing, sieving by a 60-mesh sieve, and collecting sludge powder;
(2) Preparing 23.3wt% magnesium sulfate solution;
(3) And (2) uniformly mixing 120g of deinked sludge powder obtained in the step (1), 80g of 85 light-burned powder and 2g of lignin, then adding the 23.3wt% solution prepared in the step (2) in batches, uniformly stirring, then loading the sludge into a mold, cooling, solidifying, demolding and drying at 37 ℃. The bending strength is 20.9Mpa, the compression strength is 5.29Mpa, the contact angle is 53.89 degrees, and the density is 1.324g/cm 3 And the mass loss rate after the material is calcined in a muffle furnace for 30min at the temperature of 450 ℃ is 31.66 percent.
Example 11
(1) Drying the deinked sludge in a 105 ℃ oven to be absolutely dry, crushing, sieving by a 60-mesh sieve, and collecting sludge powder;
(2) Preparing 23.3wt% magnesium sulfate solution;
(3) And (2) uniformly mixing 50g of deinked sludge powder, 150g of 85 light-burned powder and 6g of lignin in the step (1), then adding 23.3wt% of solution prepared in the step (2) in batches, uniformly stirring, then loading the sludge into a mold, cooling, solidifying, demolding and drying at 37 ℃. The bending strength is 24.03MPa, the compression strength is 9MPa, the contact angle is 36.34 degrees, and the density is 1.471g/cm 3 And the mass loss rate after the material is calcined in a muffle furnace for 30min at the temperature of 450 ℃ is 34.08 percent.
Example 12
(1) Drying the deinked sludge in a 105 ℃ oven to be completely dry, crushing, sieving by a 60-mesh sieve, and collecting sludge powder;
(2) Preparing 23.3wt% magnesium sulfate solution;
(3) And (2) uniformly mixing 100g of deinking sludge powder, 100g of 85 light-burned powder and 10g of lignin in the step (1), then adding the 23.3wt% solution prepared in the step (2) in batches, uniformly stirring, then loading the sludge into a mold, cooling, solidifying, demolding and drying at 37 ℃. The bending strength is 34.04Mpa, the compression strength is 6.59Mpa, the contact angle is 66.98 degrees, and the density is 1.416g/cm 3 And the mass loss rate after the material is calcined in a muffle furnace for 30min at the temperature of 450 ℃ is 34.61 percent.
Example 13
(1) Drying the deinked sludge in a 105 ℃ oven to be absolutely dry, crushing, sieving by a 60-mesh sieve, and collecting sludge powder;
(2) Preparing 23.3wt% magnesium chloride solution;
(3) And (2) uniformly mixing 150g of deinked sludge powder obtained in the step (1), 50g of magnesium oxide and 6g of lignin, then adding the 23.3wt% solution prepared in the step (2) in batches, uniformly stirring, then loading the sludge into a mold, cooling and solidifying, demolding, and drying at 37 ℃. The bending strength is 21.35Mpa, the compression strength is 5.53Mpa, the contact angle is 56.76 degrees, and the density is 1.423g/cm 3 And the mass loss rate of the material after being calcined in a muffle furnace for 30min at the temperature of 450 ℃ is 29.77 percent.
Example 14
(1) Drying the deinked sludge in a 105 ℃ oven to be absolutely dry, crushing, sieving by a 60-mesh sieve, and collecting sludge powder;
(2) Preparing 23.3wt% magnesium chloride solution;
(3) And (2) uniformly mixing 100g of deinked sludge powder obtained in the step (1), 100g of magnesium oxide and 6g of lignin, then adding the 23.3wt% solution prepared in the step (2) in batches, uniformly stirring, then loading the sludge into a mold, cooling and solidifying, demolding, and drying at 37 ℃. The bending strength is 31.35Mpa, the compression strength is 8.16Mpa, the contact angle is 56.55 degrees, and the density is 1.626g/cm 3 And the mass loss rate after the material is calcined in a muffle furnace for 30min at the temperature of 450 ℃ is 30.08 percent.
Example 15
(1) Drying the deinked sludge in a 105 ℃ oven to be absolutely dry, crushing, sieving by a 60-mesh sieve, and collecting sludge powder;
(2) Preparing 23.3wt% magnesium chloride solution;
(3) And (2) uniformly mixing 120g of deinked sludge powder obtained in the step (1), 80g of magnesium oxide and 2g of lignin, then adding the 23.3wt% solution prepared in the step (2) in batches, uniformly stirring, then loading the sludge into a mold, cooling and solidifying, demolding, and drying at 37 ℃. The bending strength is 26.11Mpa, the compression strength is 4.63Mpa, the contact angle is 35.52 degrees, and the density is 1.441g/cm 3 And the mass loss rate of the material after being calcined in a muffle furnace at 450 ℃ for 30min is 29.23 percent.
Example 16
(1) Drying the deinked sludge in a 105 ℃ oven to be completely dry, crushing, sieving by a 60-mesh sieve, and collecting sludge powder;
(2) Preparing 23.3wt% magnesium chloride solution;
(3) And (2) uniformly mixing 50g of deinked sludge powder obtained in the step (1), 150g of magnesium oxide and 6g of lignin, then adding 23.3wt% of solution prepared in the step (2) in batches, uniformly stirring, then loading the sludge into a mold, cooling and solidifying, demolding, and drying at 37 ℃. The bending strength is 15.22Mpa, the compression strength is 8.08Mpa, the contact angle is 37.6 degrees, and the density is 1.706g/cm 3 And the mass loss rate of the material after being calcined in a muffle furnace at 450 ℃ for 30min is 27.52 percent.
Example 17
Influence of coating layer number of polycaprolactone solution on hydrophobic property of deinked sludge cementing material
(1) The formula of the prepared deinking sludge-based cementing material comprises 80g of deinking sludge powder, 120g of 85 caustic soda powder, 2g of lignin and 150g of 23.3wt% magnesium sulfate solution.
(2) For the cement prepared in example 2, 21 pieces of cement were taken and then coated with 1, 2, 3, 4, 5, 6, 7 layers of 10wt% polycaprolactone solution, 3 parallel layers each. Waiting for air drying after each layer is coated, and coating the next layer, wherein the coating weight is 0.05mL/cm each time 2 。
(3) The contact angles of the deinked sludge gel materials with different coating layer numbers were measured. As a result, as shown in FIG. 2, the contact angle gradually increased with the increase in the number of layers of the polycaprolactone solution applied, but after 6 layers were applied, the contact angle did not increase any more. The contact angle of the material coated with 6 layers of polycaprolactone solution reaches 81.27 degrees (the contact angle is shown in figure 5), and compared with the material not coated with polycaprolactone solution, the contact angle is improved by 50.11 percent.
Example 18
(1) Drying the deinked sludge in a 105 ℃ drying oven to be completely dry, crushing, sieving by a 50-mesh sieve, and collecting sludge powder;
(2) Preparing 23.3wt% magnesium sulfate solution and 12wt% polycaprolactone solution;
(3) Uniformly mixing the deinked sludge powder obtained in the step (1), 85 light burning powder and lignin according to the proportion shown in the table 1, then adding 150g of the 23.3wt% magnesium sulfate solution prepared in the step (2) in batches, uniformly stirring, then loading the sludge into a mold, cooling, solidifying, demolding, and drying at 37 ℃.
(4) And (3) taking the gel material prepared in the step (3), coating the gel material on the surface for 4 times by using the 10wt% polycaprolactone solution prepared in the step (2) according to the coating weight of 0.05mL/cm & lt 2 & gt. After each layer is coated, a new layer is coated after being dried.
(5) And (5) testing the bending strength, the compression strength, the contact angle and the density of the cementing material prepared in the step (4).
TABLE 1
Figure BDA0003632183730000081
Comparative example 1
Mixing 200g 85 light calcined powder and 150g 23.3wt% magnesium sulfate solution, pouring into a mold, cooling, solidifying, and testing the flexural strength of 50.756Mpa, compressive strength of 7.01Mpa, contact angle of 5.67 ° (contact angle figure is shown in figure 4), and density of 1.880g/cm 3 And the mass loss rate after the combustion at 450 ℃ is 30.66 percent.
Comparative example 2
Mixing 200g of magnesium oxide and 100g of 23.3wt% magnesium chloride solution uniformly, pouring the mixture into a mold, and testing the bending strength of the mixture after cooling and solidification to be 40.87Mpa, the compressive strength to be 9.78Mpa, the contact angle to be 8.13 degrees and the density to be 2.002g/cm 3 And the mass loss rate after the combustion at 450 ℃ is 22.75 percent.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the present invention, and these modifications should also be construed as the protection scope of the present invention.

Claims (10)

1. A preparation method of a paper-making deinking sludge-based gel material, which is characterized in that,
1) Uniformly stirring and mixing papermaking deinking sludge powder, active materials and lignin;
the active material is magnesium oxide analytically pure or 85 light calcined powder;
2) Adding the magnesium salt solution, stirring uniformly, pouring into a mould, and drying to obtain a gelling agent material;
3) Coating the polycaprolactone solution on the surface of the gelling agent material, and naturally drying.
2. The preparation method of the paper-making deinking sludge-based gel material as claimed in claim 1, wherein the pretreatment method of the paper-making deinking sludge powder comprises the following steps: drying the deinking sludge collected by a paper mill in a 105 ℃ oven to be absolutely dry, crushing and sieving by a 50-100 mesh sieve.
3. The method for preparing a paper deinking sludge-based gel material according to claim 1, wherein the amount of the gel material applied in step 3) is 0.05mL/cm per application 2 The number of coating times is 1 to 7.
4. The method for preparing a paper deinking sludge-based gel material according to claim 1, wherein the concentration of the magnesium salt solution is 21 to 25wt%.
5. The method for preparing a paper deinking sludge-based gel material as claimed in claim 1, wherein the lignin used is bamboo alkali lignin.
6. The method for preparing a paper-making deinking sludge-based gel material according to claim 1, wherein the drying temperature in the step 2) is 30 ℃ to 45 ℃.
7. The paper-making deinking sludge-based gel material prepared by the preparation method of any one of claims 1 to 6, wherein the paper-making sludge gel material comprises 10 to 40 weight percent of paper-making deinking sludge powder, 40 to 55 weight percent of magnesium salt solution, 10 to 40 weight percent of magnesium oxide, 1 to 5 weight percent of lignin and 8 to 12 weight percent of polycaprolactone solution.
8. The paper deinking sludge-based gel material of claim 7, wherein the magnesium salt solution is a magnesium sulfate solution or a magnesium chloride solution.
9. The preparation method of any one of claims 7 or 8, wherein the paper-making deinking sludge hydrogel material is prepared by the preparation method and is applied to preparation of building materials.
10. Use according to claim 9, wherein the building material comprises fire-resistant panels or light-weight partitions.
CN202210492813.1A 2022-05-07 2022-05-07 Papermaking deinking sludge-based gel material and preparation method and application thereof Pending CN115385653A (en)

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