CN111646764A - Whisker modified hydrated magnesium silicate material and preparation method and application thereof - Google Patents

Whisker modified hydrated magnesium silicate material and preparation method and application thereof Download PDF

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Publication number
CN111646764A
CN111646764A CN202010659567.5A CN202010659567A CN111646764A CN 111646764 A CN111646764 A CN 111646764A CN 202010659567 A CN202010659567 A CN 202010659567A CN 111646764 A CN111646764 A CN 111646764A
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China
Prior art keywords
parts
whisker
magnesium silicate
silica fume
modified hydrated
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CN202010659567.5A
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Chinese (zh)
Inventor
张婷婷
武震林
李童
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Dalian University of Technology
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Dalian University of Technology
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Priority to CN202010659567.5A priority Critical patent/CN111646764A/en
Publication of CN111646764A publication Critical patent/CN111646764A/en
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions 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
    • C04B28/10Lime cements or magnesium oxide cements
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B14/00Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/38Fibrous materials; Whiskers
    • C04B14/383Whiskers
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength

Abstract

The invention provides a whisker modified hydrated magnesium silicate material and a preparation method and application thereof, relating to the technical field of novel building materials. The whisker modified hydrated magnesium silicate material mainly comprises magnesium oxide, silica fume, aggregate, sodium hexametaphosphate and basic magnesium sulfate whisker according to a specific proportion, and energy can be consumed between the basic magnesium sulfate whisker and a whisker modified hydrated magnesium silicate material matrix in a friction mode after the raw materials are cured and molded, so that the generation of cracks and the rapid expansion of fracture surfaces are retarded to a great extent, and the mechanical strength of the whisker modified hydrated magnesium silicate material after being cured and molded can be effectively improved; meanwhile, the addition of sodium hexametaphosphate reduces the water-cement ratio of the whisker modified hydrated magnesium silicate material; the addition of quartz sand and basic magnesium sulfate whiskers provides a framework for the M-S-H gel, and reduces the shrinkage of the M-S-H gel. Therefore, the problems of large water demand and large dry shrinkage deformation of the existing hydrated magnesium silicate cement can be effectively solved.

Description

Whisker modified hydrated magnesium silicate material and preparation method and application thereof
Technical Field
The invention relates to the technical field of novel building materials, in particular to a whisker modified hydrated magnesium silicate material and a preparation method and application thereof.
Background
Cementitious materials, also known as cements. Under the physical and chemical action, it can be changed into firm stone-like body from slurry, and can be used for cementing other materials, so that it can be made into the composite solid matter with a certain mechanical strength. The hydrated magnesium silicate cement is one of the cementing materials, which is made of magnesium oxide (MgO)And silica fume (SiO)2) The material is prepared by adding water and mixing, has the advantages of light weight, low alkalinity, simple production process and the like, has excellent mechanical property, and is a novel green cementing material.
Based on the advantages, the hydrated magnesium silicate cement can be applied to the aspects of refractory heat-insulating materials, solid sealing nuclear waste, heavy metal ions and the like, and shows good application prospect in the field of building materials. However, although the hydrated magnesium silicate cement has many advantages, the hydrated magnesium silicate cement also has the defects of large water demand and large dry shrinkage deformation, and the defects seriously restrict the development of the hydrated magnesium silicate cement, so that a new breakthrough is required to be searched for and the hydrated magnesium silicate cement is better applied.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The whisker modified hydrated magnesium silicate material is mainly prepared from magnesium oxide, silica fume, aggregate, sodium hexametaphosphate and basic magnesium sulfate whiskers, and can effectively improve the mechanical strength of the whisker modified hydrated magnesium silicate material after being cured and molded.
The second purpose of the invention is to provide a preparation method of whisker modified hydrated magnesium silicate material, which has the advantages of simple preparation process, simple and convenient operation, easy implementation, no need of special processing equipment in the preparation process and the like.
The third purpose of the invention is to provide the application of the whisker modified hydrated magnesium silicate material, and the whisker modified hydrated magnesium silicate material can be widely applied to the preparation process of building materials.
In order to achieve the above purpose of the present invention, the following technical solutions are adopted:
the invention provides a whisker modified hydrated magnesium silicate material which comprises the following components in parts by weight: 30-50 parts of magnesium oxide, 40-60 parts of silica fume, 90-120 parts of aggregate, 2-4 parts of sodium hexametaphosphate, 1-8 parts of submicron fiber and 50-60 parts of water;
preferably, the sub-micron fibers comprise basic magnesium sulfate whiskers.
Further, the whisker modified hydrated magnesium silicate material comprises the following components in parts by weight: 30-40 parts of magnesium oxide, 40-50 parts of silica fume, 90-100 parts of aggregate, 2-3 parts of sodium hexametaphosphate, 1.5-4 parts of basic magnesium sulfate whisker and 50-55 parts of water;
preferably, the whisker modified hydrated magnesium silicate material comprises the following components in parts by mass: 30 parts of magnesium oxide, 50 parts of silica fume, 90 parts of aggregate, 2 parts of sodium hexametaphosphate, 1.5 parts of basic magnesium sulfate whisker and 55 parts of water;
preferably, the whisker modified hydrated magnesium silicate material comprises the following components in parts by mass: 40 parts of magnesium oxide, 40 parts of silica fume, 100 parts of aggregate, 3 parts of sodium hexametaphosphate, 4 parts of basic magnesium sulfate whisker and 50 parts of water.
Further, the basic magnesium sulfate whisker is NP-TW2 in model, 10-60 microns in length, 0.5-1 micron in diameter and 30-35 in length-diameter ratio;
preferably, the basic magnesium sulfate whisker has the water content of 0.5-1% and the pH value of 9-9.5.
Further, the magnesium oxide comprises any one of light-burned magnesium oxide or heavy-burned magnesium oxide;
preferably, the magnesium oxide is light-burned magnesium oxide;
more preferably, the magnesium oxide is light-burned magnesium oxide with the active content of 82-86% and the median particle size of 7.87 micrometers.
Further, the silica fume comprises any one of 900U-shaped silica fume, 920U-shaped silica fume, 940U-shaped silica fume or 970U-shaped silica fume;
preferably, the silica fume is 920U-shaped silica fume;
more preferably, the silica fume is 920U-shaped silica fume with the median particle size of 255 nm.
Further, the aggregate comprises any one of river sand, quartz sand or limestone sand, preferably quartz sand;
preferably, the aggregate is quartz sand with the particle size of 0.21-0.36 mm.
The invention provides a preparation method of the whisker modified hydrated magnesium silicate material, which comprises the following steps:
the raw materials are uniformly mixed to obtain the whisker modified hydrated magnesium silicate material.
Further, the preparation method comprises the following steps:
(a) mixing magnesium oxide, silica fume and basic magnesium sulfate whisker to obtain a mixture A;
(b) dissolving sodium hexametaphosphate in water to obtain a solution A;
(c) mixing the mixture A obtained in the step (a) with the solution A obtained in the step (b), adding aggregate, and uniformly mixing to obtain a whisker modified hydrated magnesium silicate material;
the order of steps (a) and (b) may be reversed.
The invention provides an application of the whisker modified hydrous magnesium silicate material in preparation of building materials.
Compared with the prior art, the invention has the beneficial effects that:
the whisker modified hydrated magnesium silicate material provided by the invention mainly comprises magnesium oxide, silica fume, aggregate, sodium hexametaphosphate and basic magnesium sulfate whisker according to a specific proportion. The crystal whisker modified hydrated magnesium silicate material prepared from the raw materials consumes energy between the basic magnesium sulfate crystal whisker and the crystal whisker modified hydrated magnesium silicate material matrix in a friction mode after curing and molding, so that the generation of cracks and the rapid expansion of fracture surfaces are retarded to a great extent, and the mechanical strength of the crystal whisker modified hydrated magnesium silicate material after curing and molding can be effectively improved; the addition of the sodium hexametaphosphate reduces the water-cement ratio of the whisker modified hydrated magnesium silicate material; the addition of the quartz sand and the basic magnesium sulfate whisker provides a framework for M-S-H gel, reduces the shrinkage of the M-S-H gel, and is particularly reflected in the improvement of the breaking strength of the whisker modified hydrated magnesium silicate material after curing and molding. Therefore, the problems of large water demand and large dry shrinkage deformation of the existing hydrated magnesium silicate cement can be effectively solved by adding the sodium hexametaphosphate, the quartz sand and the basic magnesium sulfate whisker.
According to the preparation method of the whisker modified hydrated magnesium silicate material, provided by the invention, all raw materials are uniformly mixed to obtain the whisker modified hydrated magnesium silicate material. The preparation method has the advantages of simple preparation process, simple and convenient operation, easy implementation, no need of special processing equipment in the preparation process and the like.
The whisker modified hydrated magnesium silicate material provided by the invention can be widely applied to the preparation process of building materials.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
According to one aspect of the invention, the whisker modified hydrated magnesium silicate material comprises the following components in parts by mass: 30-50 parts of magnesium oxide, 40-60 parts of silica fume, 90-120 parts of aggregate, 2-4 parts of sodium hexametaphosphate, 1-8 parts of submicron fiber and 50-60 parts of water.
Preferably, the sub-micron fibers comprise basic magnesium sulfate whiskers.
The crystal whisker modified hydrated magnesium silicate material of the invention uses the following raw materials:
magnesium oxide: providing a magnesium raw material, and providing an alkaline environment for the formation of M-S-H gel after reaction with water.
Silica fume: a siliceous starting material is provided.
Aggregate: providing a framework for the M-S-H gel to limit drying shrinkage of the M-S-H gel.
Sodium hexametaphosphate: sodium hexametaphosphate can be used as MgO-SiO2-H2The dispersant of the O-gelling system reduces the water consumption and can regulate and control Mg in the solution2+And (4) concentration.
Basic magnesium sulfate whisker: also called as magnesium salt whisker, the appearance is white powder, the crystal shape is needle-like or fibrous, and the pH value is between 9 and 9.5. The pH value of the basic magnesium sulfate whisker is closer to that of a hydrated magnesium silicate system, and the basic magnesium sulfate whisker is a novel needle-shaped short fiber green environment-friendly reinforcing material. Meanwhile, the strength and the modulus of the basic magnesium sulfate are close to theoretical values of bond strength of a complete crystal material, the basic magnesium sulfate has the characteristics of high strength, high modulus, excellent heat resistance and excellent heat insulation performance, and has double composite action of fiber and mineral fine powder. The crack begins to be generated in the cement matrix along with the continuous increase of external stress, when the crack tries to penetrate through the whisker, the whisker prevents and passivates the expansion of the crack tip and the fracture surface, however, the stress concentration generated at the crack tip can cause the whisker to fracture, so that the crack continues to expand, but the fracture process of the whisker still consumes a part of energy, so that the peak load capacity of the cement-based composite material is increased, the capacity dissipation effect of the basic magnesium sulfate whisker in the toughening mechanism effectively reduces the stress concentration phenomenon at the crack tip in the cement material, so that the stress distribution and transfer are optimized, and the compressive strength, the breaking strength and other properties are improved by a lot compared with the original performance.
The whisker modified hydrated magnesium silicate material provided by the invention mainly comprises magnesium oxide, silica fume, aggregate, sodium hexametaphosphate and basic magnesium sulfate whisker according to a specific proportion. The crystal whisker modified hydrated magnesium silicate material prepared from the raw materials consumes energy by friction between the basic magnesium sulfate crystal whisker and a crystal whisker modified hydrated magnesium silicate material matrix after curing and molding, so that the generation of cracks and the rapid expansion of fracture surfaces are retarded to a great extent, the mechanical strength of the crystal whisker modified hydrated magnesium silicate material after curing and molding can be effectively improved, the addition of sodium hexametaphosphate reduces the water-cement ratio of the crystal whisker modified hydrated magnesium silicate material; the addition of the quartz sand and the basic magnesium sulfate whisker provides a framework for M-S-H gel, reduces the shrinkage of the M-S-H gel, and is particularly reflected in the improvement of the breaking strength of the whisker modified hydrated magnesium silicate material after curing and molding. Therefore, the problems of large water demand and large dry shrinkage deformation of the existing hydrated magnesium silicate cement can be effectively solved by adding the sodium hexametaphosphate, the quartz sand and the basic magnesium sulfate whisker.
Typical but non-limiting preferred embodiments of the above-mentioned magnesium oxide are: 30 parts, 32 parts, 34 parts, 35 parts, 36 parts, 38 parts, 40 parts, 42 parts, 45 parts, 46 parts, 48 parts and 50 parts; typical but non-limiting preferred embodiments of the above silica fume are: 40 parts, 42 parts, 44 parts, 45 parts, 46 parts, 48 parts, 50 parts, 52 parts, 55 parts, 56 parts, 58 parts and 60 parts; typical but non-limiting preferred embodiments of the above aggregate are: 90 parts, 92 parts, 94 parts, 95 parts, 96 parts, 98 parts, 100 parts, 102 parts, 105 parts, 106 parts, 108 parts, 110 parts, 112 parts, 115 parts, 116 parts, 118 parts and 120 parts; typical but non-limiting preferred embodiments of the above sodium hexametaphosphate are: 2 parts, 3 parts and 4 parts; typical but non-limiting preferred embodiments of the above basic magnesium sulfate whiskers are: 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts and 8 parts; typical but non-limiting preferred embodiments of the above water are: 50 parts, 52 parts, 55 parts, 56 parts, 58 parts and 60 parts.
In a preferred embodiment of the invention, the whisker modified hydrated magnesium silicate material comprises the following components in parts by mass: 30-40 parts of magnesium oxide, 40-50 parts of silica fume, 90-100 parts of aggregate, 2-3 parts of sodium hexametaphosphate, 1.5-4 parts of basic magnesium sulfate whisker and 50-55 parts of water;
preferably, the whisker modified hydrated magnesium silicate material comprises the following components in parts by mass: 30 parts of magnesium oxide, 50 parts of silica fume, 90 parts of aggregate, 2 parts of sodium hexametaphosphate, 1.5 parts of basic magnesium sulfate whisker and 55 parts of water;
preferably, the whisker modified hydrated magnesium silicate material comprises the following components in parts by mass: 40 parts of magnesium oxide, 40 parts of silica fume, 100 parts of aggregate, 3 parts of sodium hexametaphosphate, 4 parts of basic magnesium sulfate whisker and 50 parts of water.
In the invention, the technical effect of the whisker modified hydrated magnesium silicate material is further optimized by further adjusting and optimizing the dosage proportion of the raw materials of each component.
In a preferred embodiment of the invention, the basic magnesium sulfate whisker has a length of 10-60 microns, a diameter of 0.5-1 micron and an aspect ratio of 30-35;
in a preferred embodiment, the basic magnesium sulfate whisker has the model number of NP-TW2, the length of 10-60 microns and the length-diameter ratio of 30-35.
Preferably, the basic magnesium sulfate whisker has the water content of 0.5-1% and the pH value of 9-9.5.
In a preferred embodiment of the present invention, the magnesium oxide includes any one of light-burned magnesium oxide or heavy-burned magnesium oxide, preferably light-burned magnesium oxide;
preferably, the magnesium oxide is light-burned magnesium oxide with the active content of 82-86% and the median particle size of 7.87 microns.
As a preferable embodiment, the light-burned magnesium oxide has high activity, is beneficial to generating M-S-H gel and improves the mechanical property.
In a preferred embodiment of the present invention, the silica fume comprises any one of 900U-shaped silica fume, 920U-shaped silica fume, 940U-shaped silica fume or 970U-shaped silica fume, preferably 920U-shaped silica fume;
preferably, the silica fume is 920U-shaped micro silica fume with the median particle size of 255 nm.
In a preferred embodiment of the present invention, the aggregate includes any one of river sand, quartz sand, or limestone sand, preferably quartz sand;
preferably, the aggregate is quartz sand with the particle size of 0.21-0.36 mm.
In a preferred embodiment, the aggregate quartz sand has less impurities and is in an irregular multi-edge shape, so that the aggregate quartz sand can form better bonding force with the whisker modified hydrated magnesium silicate material and improve the mechanical property of the whisker modified hydrated magnesium silicate material.
According to one aspect of the invention, the preparation method of the whisker modified hydrated magnesium silicate material comprises the following steps:
the raw materials are uniformly mixed to obtain the whisker modified hydrated magnesium silicate material.
According to the preparation method of the whisker modified hydrated magnesium silicate material, provided by the invention, all raw materials are uniformly mixed to obtain the whisker modified hydrated magnesium silicate material. The preparation method has the advantages of simple preparation process, simple and convenient operation, easy implementation, no need of special processing equipment in the preparation process and the like.
In a preferred embodiment of the present invention, the preparation method comprises the steps of:
(a) mixing magnesium oxide, silica fume and basic magnesium sulfate whisker to obtain a mixture A;
(b) dissolving sodium hexametaphosphate in water to obtain a solution A;
(c) mixing the mixture A obtained in the step (a) with the solution A obtained in the step (b), adding aggregate, and uniformly mixing to obtain a whisker modified hydrated magnesium silicate material;
the order of steps (a) and (b) may be reversed.
According to one aspect of the invention, the whisker modified hydrous magnesium silicate material is applied to preparation of building materials.
The whisker modified hydrated magnesium silicate material provided by the invention can be widely applied to the preparation process of building materials.
The technical solution of the present invention will be further described with reference to examples and comparative examples.
Examples 1 to 7
A whisker modified hydrated magnesium silicate material comprises the following components in parts by weight:
wherein the magnesium oxide is light-burned magnesium oxide with the active content of 82-86% and the median particle size of 7.87 microns; the silica fume is 920U-shaped micro silica fume with the median particle size of 255 nm; the aggregate is quartz sand with the particle size of 0.21-0.36 mm; the basic magnesium sulfate whisker is NP-TW2 in model, 10-60 microns in length, 0.5-1 micron in diameter, 30-35 in length-diameter ratio, 0.5-1% in water content and 9-9.5 in pH.
The preparation method of the whisker modified hydrated magnesium silicate material comprises the following steps:
(a) mixing magnesium oxide, silica fume and basic magnesium sulfate whisker to obtain a mixture A;
(b) dissolving sodium hexametaphosphate in water to obtain a solution A;
(c) adding the mixture A obtained in the step (a) into the solution A obtained in the step (b) for 3 times, stirring for 120 seconds at first and then 120 seconds at last, and finally adding the aggregate, continuously stirring and uniformly mixing to obtain the whisker modified hydrated magnesium silicate material.
Example 8
The method is the same as that of example 5 except that the basic magnesium sulfate whisker adopted in the method is NP-TW1, the length is 3.5-120 microns, the diameter is 0.5-2 microns, the length-diameter ratio is 8-70, the water content is 0.5-1%, and the pH value is 9-10.5.
Example 9
The same as example 5 was repeated, except that the aggregate used in this example was a ceramsite.
Example 10
A whisker modified hydrated magnesium silicate material comprises the following components in parts by weight:
the preparation method of the whisker modified hydrated magnesium silicate material is the same as that of example 5.
Comparative example 1
The comparative example is the same as example 5 except that the raw material composition does not contain basic magnesium sulfate whiskers.
Comparative example 2
The comparative example is the same as example 5 except that the basic magnesium sulfate whiskers in the raw material components were replaced with glass fibers.
Comparative example 3
The comparative example is the same as example 5 except that the basic magnesium sulfate whiskers in the raw material components are replaced by plant fibers.
Comparative example 4
The comparative example is the same as example 5 except that the basic magneislum whiskers in the raw material components are replaced by brucite fibers.
Experimental example 1
In order to show that the whisker modified hydrated magnesium silicate material prepared by the method has the characteristic of high mechanical strength after being cured, the whisker modified hydrated magnesium silicate materials prepared in the examples 1 to 10 and the comparative examples 1 to 4 are subjected to a curing detection test, and the method specifically comprises the following steps:
(1) pouring the whisker modified hydrated magnesium silicate materials prepared in the embodiments 1-10 and the comparative examples 1-4 into a mold, and then putting the mold on a vibrating machine to vibrate for 120s to reduce gaps in slurry to the maximum extent to prepare a sample; the samples were then cured at 20 ℃ at 95% relative humidity and demolded after 24 h. And (3) placing the demoulded mortar test piece into a standard curing room with the relative humidity of 95% for continuous curing for 28d to obtain the test material.
(2) And detecting the prepared test material by adopting a cube compressive strength test and a three-point bending flexural strength test, wherein the test ages are 28d, the loading rate of the cube compressive strength test is 2400N/S, and the three-point bending test is carried out on the sample under the conditions of 100mm span and 50N/S loading rate. The tensile strength and the compressive strength are tested by adopting a WHY-300/10 microcomputer control compression and bending tester (Shanghai Hualong test instrument, Inc.) according to the national standard GB/T17671-1999.
The specific detection results are as follows:
the above table shows that the whisker modified hydrated magnesium silicate material prepared in the embodiments 3-5 of the present invention has excellent mechanical strength after curing, wherein the 28d compressive strength is not less than 55MPa, and the 28d cleavage tensile strength is not less than 5.3MPa, which are far superior to the hydrated magnesium silicate cement mortar in the comparative example 1, so that the present invention prepares the hydrated magnesium silicate cement-based composite mortar by adding quartz sand and basic magnesium sulfate whisker, and utilizes sodium hexametaphosphate to reduce the water-cement ratio and reduce the shrinkage caused by excessive moisture; the framework lapped by the quartz sand and the basic magnesium sulfate whisker can limit the drying shrinkage of M-S-H gel to a certain extent when the whisker modified hydrated magnesium silicate material is dehydrated and dried, reduce the generation of internal drying shrinkage cracks, and reduce the stress concentration phenomenon at the tip of the internal cracks of the cement material when the whisker modified hydrated magnesium silicate material is subjected to external stress, so that the stress distribution and transfer are optimized, and the mechanical strength of the cement-based composite material is greatly improved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. The whisker modified hydrated magnesium silicate material is characterized by comprising the following components in parts by mass: 30-50 parts of magnesium oxide, 40-60 parts of silica fume, 90-120 parts of aggregate, 2-4 parts of sodium hexametaphosphate, 1-8 parts of submicron fiber and 50-60 parts of water;
preferably, the sub-micron fibers comprise basic magnesium sulfate whiskers.
2. The whisker modified hydrated magnesium silicate material of claim 1, which comprises the following components in parts by mass: 30-40 parts of magnesium oxide, 40-50 parts of silica fume, 90-100 parts of aggregate, 2-3 parts of sodium hexametaphosphate, 1.5-4 parts of basic magnesium sulfate whisker and 50-55 parts of water.
3. The whisker modified hydrated magnesium silicate material of claim 1, which comprises the following components in parts by mass: 30 parts of magnesium oxide, 50 parts of silica fume, 90 parts of aggregate, 2 parts of sodium hexametaphosphate, 1.5 parts of basic magnesium sulfate whisker and 55 parts of water;
preferably, the whisker modified hydrated magnesium silicate material comprises the following components in parts by mass: 40 parts of magnesium oxide, 40 parts of silica fume, 100 parts of aggregate, 3 parts of sodium hexametaphosphate, 4 parts of basic magnesium sulfate whisker and 50 parts of water.
4. The whisker modified hydrated magnesium silicate material of any one of claims 1 to 3, wherein the basic magnesium sulfate whisker has a model number NP-YW2, a length of 10 to 60 microns, a diameter of 0.5 to 1 micron, and an aspect ratio of 30 to 35;
preferably, the basic magnesium sulfate whisker has the water content of 0.5-1% and the pH value of 9-9.5.
5. The whisker-modified hydrated magnesium silicate material according to any one of claims 1 to 3, wherein the magnesium oxide comprises any one of light-burned magnesium oxide and heavy-burned magnesium oxide;
preferably, the magnesium oxide is light-burned magnesium oxide;
more preferably, the magnesium oxide is light-burned magnesium oxide with the active content of 82-86% and the median particle size of 7.87 micrometers.
6. The whisker-modified hydrated magnesium silicate material according to any one of claims 1 to 3, wherein the silica fume comprises any one of 900U-shaped silica fume, 920U-shaped silica fume, 940U-shaped silica fume or 970U-shaped silica fume;
preferably, the silica fume is 920U-shaped silica fume;
more preferably, the silica fume is 920U-shaped silica fume with the median particle size of 255 nm.
7. The whisker-modified hydrated magnesium silicate material according to any one of claims 1 to 3, wherein the aggregate comprises any one of river sand, quartz sand or limestone sand, preferably quartz sand;
preferably, the aggregate is quartz sand with the particle size of 0.21-0.36 mm.
8. A method for preparing the whisker modified hydrated magnesium silicate material according to any one of claims 1 to 7, wherein the method comprises the following steps:
the raw materials are uniformly mixed to obtain the whisker modified hydrated magnesium silicate material.
9. The method for preparing whisker modified hydrated magnesium silicate material according to claim 8, wherein the method comprises the following steps:
(a) mixing magnesium oxide, silica fume and basic magnesium sulfate whisker to obtain a mixture A;
(b) dissolving sodium hexametaphosphate in water to obtain a solution A;
(c) mixing the mixture A obtained in the step (a) with the solution A obtained in the step (b), adding aggregate, and uniformly mixing to obtain a whisker modified hydrated magnesium silicate material;
the order of steps (a) and (b) may be reversed.
10. Use of the whisker modified hydrous magnesium silicate material as set forth in any one of claims 1 to 7 in preparation of building materials.
CN202010659567.5A 2020-07-09 2020-07-09 Whisker modified hydrated magnesium silicate material and preparation method and application thereof Pending CN111646764A (en)

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN111303775A (en) * 2020-03-30 2020-06-19 山东建筑大学 Anti-cracking inorganic adhesive for bamboo and wood structure and preparation method thereof

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