CN116354686A - Thick anti-cracking middle layer coating and preparation method thereof - Google Patents
Thick anti-cracking middle layer coating and preparation method thereof Download PDFInfo
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- CN116354686A CN116354686A CN202211338598.6A CN202211338598A CN116354686A CN 116354686 A CN116354686 A CN 116354686A CN 202211338598 A CN202211338598 A CN 202211338598A CN 116354686 A CN116354686 A CN 116354686A
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- 238000000576 coating method Methods 0.000 title claims abstract description 86
- 239000011248 coating agent Substances 0.000 title claims abstract description 85
- 238000005336 cracking Methods 0.000 title claims abstract description 61
- 238000002360 preparation method Methods 0.000 title abstract description 20
- 239000004568 cement Substances 0.000 claims abstract description 41
- 239000000835 fiber Substances 0.000 claims abstract description 41
- 235000013162 Cocos nucifera Nutrition 0.000 claims abstract description 40
- 244000060011 Cocos nucifera Species 0.000 claims abstract description 40
- 238000010276 construction Methods 0.000 claims abstract description 13
- -1 polyethylene Polymers 0.000 claims description 40
- 239000004698 Polyethylene Substances 0.000 claims description 35
- 229920000573 polyethylene Polymers 0.000 claims description 35
- 229920002678 cellulose Polymers 0.000 claims description 33
- 239000001913 cellulose Substances 0.000 claims description 33
- 229910021487 silica fume Inorganic materials 0.000 claims description 33
- 239000010440 gypsum Substances 0.000 claims description 29
- 229910052602 gypsum Inorganic materials 0.000 claims description 29
- 239000002994 raw material Substances 0.000 claims description 16
- 238000002156 mixing Methods 0.000 claims description 14
- 239000011398 Portland cement Substances 0.000 claims description 13
- 239000011325 microbead Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 9
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- 229920000663 Hydroxyethyl cellulose Polymers 0.000 claims description 3
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims description 3
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- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 3
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 3
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 3
- 125000002467 phosphate group Chemical class [H]OP(=O)(O[H])O[*] 0.000 claims description 3
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- 241000196324 Embryophyta Species 0.000 description 1
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 1
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- 229920002535 Polyethylene Glycol 1500 Polymers 0.000 description 1
- 230000009471 action Effects 0.000 description 1
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- 239000012267 brine Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
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- 239000003960 organic solvent Substances 0.000 description 1
- 125000006353 oxyethylene group Chemical group 0.000 description 1
- 239000011236 particulate material Substances 0.000 description 1
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- 239000013535 sea water Substances 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- VUYXVWGKCKTUMF-UHFFFAOYSA-N tetratriacontaethylene glycol monomethyl ether Chemical compound COCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCO VUYXVWGKCKTUMF-UHFFFAOYSA-N 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
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Classifications
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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
- C04B28/14—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 calcium sulfate cements
- C04B28/142—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/144—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being a flue gas desulfurization product
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00482—Coating or impregnation materials
- C04B2111/00508—Cement paints
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
-
- 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
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to the technical field of constructional engineering, in particular to a thick anti-cracking middle layer coating and a preparation method thereof. The invention can not crack when the coconut fiber is added and coated on 20-40 mm in a single batch, and can finish middle layer construction only by single construction on the wall surface with uneven base surface, thereby saving a great deal of manpower. When the coconut fiber is added to replace cement, the integral compressive strength of the material is increased linearly and rapidly by 0% -35%, and when the compressive strength of the middle layer material reaches 2%, the compressive strength of the middle layer material reaches the inflection point increasing rate area to be stable, so that the characteristics of the middle layer material can be utilized to replace part of cement in the middle layer material, and energy conservation and emission reduction benefits are generated.
Description
Technical Field
The invention relates to the technical field of constructional engineering, in particular to a thick anti-cracking middle layer coating and a preparation method thereof.
Background
The middle layer paint industry of the building has a profound effect on the life of people, the middle layer paint used in the building materials is mainly of a greasy class, the putty is easy to crack when being used for single-pass construction exceeding 2mm, and the uneven wall surface can be subjected to multiple-pass construction, so that time and labor are wasted.
In addition, in the prior art, the main adhesive of the middle-layer coating is cement, the cement is a raw material with high energy consumption and high pollution, and the cement is replaced by environment-friendly and green renewable resources for reducing the consumption of environment-friendly and low-carbon environment-friendly materials.
Therefore, development of a middle layer coating which is free from cracking and has heat preservation and heat insulation functions in single-pass construction exceeding 20mm is urgently needed.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a thick anti-cracking middle layer coating and a preparation method thereof, which are used for solving the problems in the prior art.
To achieve the above and other related objects, one aspect of the present invention provides a thick anti-cracking middle layer coating, which comprises the following raw materials in percentage by weight:
in some embodiments of the present invention, the raw materials of the coating comprise the following components in percentage by weight:
in some embodiments of the invention, the length of the coir is from 4 to 9mm.
In some embodiments of the invention, the coconut fibers have a diameter of 10 to 20 microns.
In some embodiments of the invention, the cement is selected from the group consisting of portland cements; the cement is preferably Portland cement No. 42.5.
In some embodiments of the invention, the oxidized polyethylene has a molecular weight of 1000 to 1500.
In some embodiments of the invention, the lightweight aggregate is selected from one or more of vitrified microbeads, polyphenyl particles; preferably, the mesh number of the lightweight aggregate is 70-100 mesh.
In some embodiments of the invention, the retarder is selected from one or more combinations of protein retarder hydroxy acid salts, phosphate salts.
In some embodiments of the invention, the cellulose is selected from one or more of hydroxypropyl methylcellulose, hydroxyethyl cellulose; the molecular weight of the cellulose is 3 ten thousand to 10 ten thousand.
The invention also provides a preparation method of the thick anti-cracking middle layer coating, which comprises the steps of mixing coconut fiber, cement, silica fume, oxidized polyethylene, light aggregate, desulfurized gypsum, retarder and cellulose.
In another aspect, the invention provides the use of a thick anti-cracking middle layer coating according to the invention in the construction field.
The thick anti-cracking middle layer coating provided by the invention has the following beneficial effects:
1. the common middle layer or putty is easy to crack when coated with more than 2mm in a single batch, the construction needs to be carried out for a plurality of times on the wall surface with uneven basal plane, and the middle layer construction can be finished only by single-pass construction on the wall surface with uneven basal plane without cracking when coated with 20-40 mm in a single batch after the addition of the coir, so that a great amount of manpower is saved.
2. When the coconut fiber is added to replace cement, the integral compressive strength of the material is increased linearly and rapidly by 0% -35%, and when the compressive strength of the middle layer material reaches 2%, the compressive strength of the middle layer material reaches the inflection point increasing rate area to be stable, so that the characteristics of the middle layer material can be utilized to replace part of cement in the middle layer material, and energy conservation and emission reduction benefits are generated.
3. The coconut fiber is a waste coconut shell, has high extraction cost ratio, is used as a natural renewable material and has excellent ageing resistance in high salt and alkali, and also maintains good corrosion resistance and ageing resistance when the performance of middle layer materials is improved, and the excellent toughness can increase the flexibility and ductility of a coating and has excellent cracking resistance.
4. The invention ensures that the coconut fiber with high toughness is easier to be laid in the middle layer coating by adding the oxidized polyethylene.
Detailed Description
The following detailed description specifically discloses an embodiment of a thick anti-cracking middle layer coating and a preparation method thereof.
The "range" disclosed herein is defined in terms of lower and upper limits, with a given range being defined by the selection of a lower and an upper limit, the selected lower and upper limits defining the boundaries of the particular range. Ranges that are defined in this way can be inclusive or exclusive of the endpoints, and any combination can be made, i.e., any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60-120 and 80-110 are listed for a particular parameter, it is understood that ranges of 60-110 and 80-120 are also contemplated. Furthermore, if the minimum range values 1 and 2 are listed, and if the maximum range values 3,4 and 5 are listed, the following ranges are all contemplated: 1-3, 1-4, 1-5, 2-3, 2-4 and 2-5. In this application, unless otherwise indicated, the numerical range "a-b" represents a shorthand representation of any combination of real numbers between a and b, where a and b are both real numbers. For example, the numerical range "0-5" means that all real numbers between "0-5" have been listed throughout, and "0-5" is simply a shorthand representation of a combination of these values. When a certain parameter is expressed as an integer of 2 or more, it is disclosed that the parameter is, for example, an integer of 2, 3,4, 5, 6, 7, 8, 9, 10, 11, 12 or the like.
Through a great deal of exploratory experiments, the inventor adopts green renewable resource coconut fiber, and has the characteristics of higher toughness and brine resistance (being not easy to corrode in cement). When replacing part of cement, the invention can improve the integral strength and toughness of the material and has good ageing resistance, but also because the characteristics of the material are not easy to lay in the material, the invention overcomes the difficult problem by the synergistic effect between a plurality of components and the coir, and the thick anti-cracking middle layer coating is obtained. On this basis, the present invention has been completed.
One aspect of the invention provides a thick anti-cracking middle layer coating, which comprises raw materials such as coconut fiber, cement, silica fume, oxidized polyethylene, lightweight aggregate, desulfurized gypsum, retarder, cellulose and the like.
In the thick anti-cracking middle layer coating provided by the invention, the raw materials comprise 1-4% of coconut fiber according to the weight percentage of the thick anti-cracking middle layer coating. In some embodiments, the coconut fiber may also be 1% -2%, 2% -4%, 2% -3%, 3% -4%, etc. by weight. The coconut fiber has high flexibility and high salt water resistance. When the present invention is used, it is generally desirable that the coir fiber be of a certain length, for example, 4 to 9mm, 4 to 6mm, 6 to 9mm, 4 to 5mm, 5 to 6mm, 6 to 7mm, 7 to 8mm, 8 to 9mm, or the like. The diameter of the coir may be 10 to 20 microns, 10 to 15 microns, 15 to 20 microns, 10 to 13 microns, 13 to 15 microns, 15 to 18 microns, 18 to 20 microns, etc.
In the thick anti-cracking middle layer coating provided by the invention, the raw materials comprise 30-50% of cement according to the weight percentage of the thick anti-cracking middle layer coating. In some embodiments, the cement may also be 30-35%, 35-45%, 30-40%, 40-50%, 30-45%, 45-50%, or the like by weight. In some embodiments, the cement is selected from portland cements. Specifically, the portland cement may be, for example, 42.5 portland cement. Cement is used as an adhesive.
In the thick anti-cracking middle layer coating provided by the invention, the raw materials comprise 5-15% of silica fume according to the weight percentage of the thick anti-cracking middle layer coating. In some embodiments, the weight percentage of the silica fume can also be 5% -8%, 8% -12%, 12% -15%, 5% -10%, 10% to the whole15%, 5% -8%, 8% -10%, or 10% -12% etc. Silica fume, also called silica fume, microsilica, is gray or off-white powder, refractoriness in appearance>1600 ℃. Weight by volume: 200-250 kg/cubic meter. The fineness of the silica fume is less than 1 mu m and accounts for more than 80 percent, the average grain diameter is 0.1 to 0.3 mu m, and the specific surface area is as follows: 20-28 m 2 And/g. The fineness and specific surface area are about 80-100 times of cement and 50-70 times of fly ash. In the present invention, the mesh number of the silica fume may be, for example, 100 to 400 mesh, 100 to 200 mesh, 200 to 300 mesh, 300 to 400 mesh, or the like. Silica fume can fill the pores between cement particles.
In the thick anti-cracking middle layer coating provided by the invention, the raw materials comprise 0.5-1% of oxidized polyethylene according to the weight percentage of the thick anti-cracking middle layer coating. In some embodiments, the oxidized polyethylene may also be 0.5% to 0.8%, 0.8% to 1%, 0.5% to 0.6%, 0.6% to 0.7%, 0.7% to 0.8%, 0.8% to 0.9%, or 0.9% to 1% by weight, etc. In the present invention, the molecular weight of the oxidized polyethylene may be, for example, a mixture obtained by polycondensation of ethylene oxide and water. Of the formula OH (CH) 2 CH 2 O) n H represents the average number of oxyethylene groups, and the value of n can be 22-30, 22-24, 24-26, 26-28, 28-30, etc. The oxidized polyethylene has a molecular weight greater than 1000, and in some embodiments, the oxidized polyethylene may have a molecular weight of 1000 to 1500, 1000 to 1200, 1200 to 1500, 1000 to 1100, 1100 to 1200, 1200 to 1300, 1300 to 1400, 1400 to 1500, or the like. Oxidized polyethylene is a white particulate material that is soluble in water and in certain organic solvents. The solution has high viscosity under low concentration, can be processed by calendaring, extrusion, casting and other modes, is thermoplastic resin, and has good compatibility with other resins. Is resistant to bacterial attack and has weak hygroscopicity in the atmosphere. The high toughness of coir is not easily laid in middle layer coatings, and applicant has found that this problem can be solved by adding oxidized polyethylene (polyethylene glycol) to the material. Oxidized polyethylene (polyethylene glycol) is a nonionic type high molecular polymer which can be wrapped on the surface of coconut fiber to keep the coconut fiber moist and soft, so that the coconut fiber is not damagedIn the case of fibers, they are soft and easily spread out during agitation.
In the thick anti-cracking middle layer coating provided by the invention, the raw materials comprise 15-25% of light aggregate according to the weight percentage of the thick anti-cracking middle layer coating. In some embodiments, the weight percentage of the lightweight aggregate may also be 15% -25%, 15% -20%, 20% -25%, 15% -18%, 18% -20%, 20% -22%, 22% -25%, or the like. In some embodiments, the lightweight aggregate is selected from one or more combinations of vitrified microbeads, white vermiculite, polyphenyl particles, and the like. Specifically, the lightweight aggregate may be, for example, 70 to 100 mesh, 70 to 80 mesh, 80 to 90 mesh, or 90 to 100 mesh. Further, the lightweight aggregate is preferably selected from vitrified microbeads. The vitrified microbeads may be, for example, 70 to 100 mesh, 70 to 80 mesh, 80 to 90 mesh, or 90 to 100 mesh, etc.
In the thick anti-cracking middle layer coating provided by the invention, the raw materials comprise 5-25% of desulfurized gypsum according to the weight percentage of the thick anti-cracking middle layer coating. In some embodiments, the weight percentage of the desulfurized gypsum can also be 5% -10%, 10% -15%, 15% -20%, 20% -25%, 5% -20%, 5% -15%, 15% -25%, etc. The desulfurized gypsum has the function of assisting in improving the initial strength of the product.
In the thick anti-cracking middle layer coating provided by the invention, the raw materials comprise 0.05-0.1% of retarder according to the weight percentage of the thick anti-cracking middle layer coating. In some embodiments, the retarder may also be 0.05% to 0.08%, or 0.08% to 0.1%, etc. The retarder in the present invention may be, for example, one or a combination of a plurality of protein retarders, hydroxy acid salts, phosphate salts, and the like. The retarder is used for adjusting the initial setting time and the final setting time of the desulfurized gypsum.
In the thick anti-cracking middle layer coating provided by the invention, the raw materials also comprise 0.3-0.5% of cellulose according to the weight percentage of the thick anti-cracking middle layer coating. In some embodiments, the weight percent of the cellulose may be, for example, 0.3% to 0.4%, 0.4% to 0.5%, 0.3% to 0.35%, 0.35% to 0.4%, 0.4% to 0.45%, or 0.45% to 0.5%, etc. The cellulose is selected from one or more of hydroxypropyl methylcellulose, hydroxyethyl cellulose, etc. The molecular weight of the cellulose can be 3 ten thousand to 10 ten thousand, 3 ten thousand to 5 ten thousand, 5 ten thousand to 8 ten thousand, 8 ten thousand to 10 ten thousand, etc. The water-retaining property of the product is improved by the action of cellulose.
In a specific embodiment of the invention, the raw materials of the thick anti-cracking middle layer coating comprise the following components in percentage by weight:
in a preferred embodiment of the invention, the raw materials of the thick anti-cracking middle layer coating comprise the following components in percentage by weight:
the invention also provides a preparation method of the thick anti-cracking middle layer coating, which comprises the following steps: mixing the coconut fiber, cement, silica fume, oxidized polyethylene, light aggregate, desulfurized gypsum, retarder and cellulose.
In the preparation method of the thick anti-cracking middle layer coating provided by the invention, specifically, coconut fiber, cement, silica fume, oxidized polyethylene, light aggregate, desulfurized gypsum, retarder and cellulose are mixed according to the proportion provided by the first aspect of the invention. For example, the mixture may be mixed at a certain stirring speed. Specifically, for example, the mixture may be uniformly mixed at a speed of 100 to 200rpm, 100 to 150rpm, or 150 to 200 rpm.
The invention also provides application of the thick anti-cracking middle layer coating in constructional engineering.
The thick anti-cracking middle layer coating provided by the invention has the following beneficial effects:
1. the common middle layer or putty is easy to crack when coated with more than 2mm in a single batch, the construction needs to be carried out for a plurality of times on the wall surface with uneven basal plane, and the middle layer construction can be finished only by single-pass construction on the wall surface with uneven basal plane without cracking when coated with 20-40 mm in a single batch after the addition of the coir, so that a great amount of manpower is saved.
2. When the coconut fiber is added to replace cement, the integral compressive strength of the material is increased linearly and rapidly by 0% -35%, and when the compressive strength of the middle layer material reaches 2%, the compressive strength of the middle layer material reaches the inflection point increasing rate area to be stable, so that the characteristics of the middle layer material can be utilized to replace part of cement in the middle layer material, and energy conservation and emission reduction benefits are generated.
3. The coconut fiber is a waste coconut shell, has high extraction cost ratio, is used as a natural renewable material and has excellent ageing resistance in high salt and alkali, and also maintains good corrosion resistance and ageing resistance when the performance of middle layer materials is improved, and the excellent toughness can increase the flexibility and ductility of a coating and has excellent cracking resistance.
4. The invention ensures that the coconut fiber with high toughness is easier to be laid in the middle layer coating by adding the oxidized polyethylene.
The advantageous effects of the present invention are further illustrated below with reference to examples.
In order to make the objects, technical solutions and advantageous technical effects of the present invention more clear, the present invention is described in further detail below with reference to examples. However, it should be understood that the examples of the present invention are merely for the purpose of explaining the present invention and are not intended to limit the present invention, and the examples of the present invention are not limited to the examples given in the specification. The specific experimental or operating conditions were not noted in the examples and were made under conventional conditions or under conditions recommended by the material suppliers.
Furthermore, it is to be understood that the reference to one or more method steps in this disclosure does not exclude the presence of other method steps before or after the combination step or the insertion of other method steps between these explicitly mentioned steps, unless otherwise indicated; it should also be understood that the combined connection between one or more devices/means mentioned in the present invention does not exclude that other devices/means may also be present before and after the combined device/means or that other devices/means may also be interposed between these two explicitly mentioned devices/means, unless otherwise indicated. Moreover, unless otherwise indicated, the numbering of the method steps is merely a convenient tool for identifying the method steps and is not intended to limit the order of arrangement of the method steps or to limit the scope of the invention in which the invention may be practiced, as such changes or modifications in their relative relationships may be regarded as within the scope of the invention without substantial modification to the technical matter.
In the examples described below, reagents, materials and apparatus used are commercially available unless otherwise specified.
Unless otherwise indicated below, the coir used was purchased from Indian coir of European Bo and a commercial company, inc. of Qingdao. Cement was purchased from the seawater mud mill elephant brand 42.5 Portland cement. Silica fume was purchased from Shandong Boken silicon materials Co., ltd., anken microsilica 920. Oxidized polyethylene was purchased from Pandale International trade company, inc., model number PEG-1500. The manufacturer of the lightweight aggregate is Hebei Xinyang 70-100 mesh vitrified microbeads. The desulfurization gypsum is purchased from the power plant desulfurization gypsum of mineral product processing factories of Lingshu county sources. Retarder was purchased from Hebei synergistic chemistry Co., ltd.HN-302. HK100000S of cellulose. The manufacturer of chlorinated polyethylene is the American Dow CPE 702P.
Example 1
The embodiment relates to a thick anti-cracking middle layer coating and a preparation method thereof, wherein the coating comprises the steps of uniformly mixing coconut fiber, cellulose, cement, silica fume, oxidized polyethylene, lightweight aggregate, desulfurized gypsum and retarder at the speed of 100-200 rpm. Specifically, the weight percentages of the components are shown in Table 1.
Table 1 example 1 thick anti-cracking middle layer coating the weight percentages (wt%) of the components:
| coconut fiber length 9mm | 3％ |
| Cellulose HK100000S | 0.35％ |
| 42.5 Portland Cement | 45％ |
| 200 mesh silica fume | 10％ |
| Oxidized polyethylene (polyethylene glycol) | 0.6％ |
| Lightweight aggregate (vitrified microbead 70-100 mesh) | 21％ |
| Desulfurized gypsum | 20％ |
| Retarder (HN-302) | 0.05％ |
| Totals to | 100％ |
Example 2
The embodiment relates to a thick anti-cracking middle layer coating and a preparation method thereof, wherein the coating comprises the steps of uniformly mixing coconut fiber, cellulose, cement, silica fume, oxidized polyethylene, lightweight aggregate, desulfurized gypsum and retarder at the speed of 100-200 rpm. Specifically, the weight percentages of the components are shown in Table 2.
Table 2 example 2 weight percent (wt%) of each component of the thick anti-spalling middle layer coating:
example 3
The embodiment relates to a thick anti-cracking middle layer coating and a preparation method thereof, wherein the coating comprises the steps of uniformly mixing coconut fiber, cellulose, cement, silica fume, oxidized polyethylene, lightweight aggregate, desulfurized gypsum and retarder at the speed of 100-200 rpm. Specifically, the weight percentages of the components are shown in Table 3.
Table 3 example 3 weight percent (wt%) of each component of the thick anti-spalling middle layer coating:
| coconut fiber length 9mm | 4％ |
| Cellulose HK100000S | 0.35％ |
| 42.5 Portland Cement | 45％ |
| 200 mesh silica fume | 10％ |
| Oxidized polyethylene (polyethylene glycol) | 0.6％ |
| Lightweight aggregate (vitrified microbead 70-100 mesh) | 20％ |
| Desulfurized gypsum | 20％ |
| Retarder (HN-302) | 0.05％ |
| Totals to | 100％ |
Example 4
The embodiment relates to a thick anti-cracking middle layer coating and a preparation method thereof, wherein the coating comprises the steps of uniformly mixing coconut fiber, cellulose, cement, silica fume, oxidized polyethylene, lightweight aggregate, desulfurized gypsum and retarder at the speed of 100-200 rpm. Specifically, the weight percentages of the components are shown in Table 4.
Table 4 example 4 thick anti-cracking middle layer coating the weight percent (wt%) of each component:
| coconut fiber length 6mm | 2％ |
| Cellulose HK100000S | 0.35％ |
| 42.5 Portland Cement | 45％ |
| 200 mesh silica fume | 10％ |
| Oxidized polyethylene (polyethylene glycol) | 0.6％ |
| Lightweight aggregate (vitrified microbead 70-100 mesh) | 22％ |
| Desulfurized gypsum | 20％ |
| Retarder (HN-302) | 0.05％ |
| Totals to | 100％ |
Example 5
The embodiment relates to a thick anti-cracking middle layer coating and a preparation method thereof, wherein the coating comprises the steps of uniformly mixing coconut fiber, cellulose, cement, silica fume, oxidized polyethylene, lightweight aggregate, desulfurized gypsum and retarder at the speed of 100-200 rpm. Specifically, the weight percentages of the components are shown in Table 5.
Table 5 example 5 weight percent (wt%) of each component of the thick anti-spalling middle layer coating:
| coconut fiber length 9mm | 2％ |
| Cellulose HK100000S | 0.35％ |
| 42.5 Portland Cement | 45％ |
| 200 mesh silica fume | 10％ |
| Oxidized polyethylene (polyethylene glycol) | 1％ |
| Lightweight aggregate (vitrified microbead 70-100 mesh) | 21.6％ |
| Desulfurized gypsum | 20％ |
| Retarder (HN-302) | 0.05％ |
| Totals to | 100％ |
Example 6
The embodiment relates to a thick anti-cracking middle layer coating and a preparation method thereof, wherein the coating comprises the steps of uniformly mixing coconut fiber, cellulose, cement, silica fume, oxidized polyethylene, lightweight aggregate, desulfurized gypsum and retarder at the speed of 100-200 rpm. Specifically, the weight percentages of the components are shown in Table 6.
Table 6 example 6 thick anti-cracking middle layer coating the weight percent (wt%) of each component:
comparative example 1
The comparative example relates to a middle layer coating and a preparation method thereof, wherein the middle layer coating comprises the steps of uniformly mixing wood fiber, cellulose, cement, silica fume, oxidized polyethylene, lightweight aggregate, desulfurized gypsum and retarder at the speed of 100-200 rpm. Specifically, the weight percentages of the components are shown in Table 7.
Table 7 weight percent (wt%) of the components of the middle layer coating in comparative example 1:
| wood fibre 1mm | 2％ |
| Cellulose HK100000S | 0.35％ |
| Cement 42.5 | 45％ |
| 200 mesh silica fume | 10％ |
| Oxidized polyethylene (polyethylene glycol) | 0.6％ |
| Lightweight aggregate (vitrified microbead 70-100 mesh) | 22％ |
| Desulfurized gypsum | 20％ |
| Retarder (HN-302) | 0.05％ |
| Totals to | 100％ |
Comparative example 2
The comparative example relates to a middle layer coating and a preparation method thereof, wherein the middle layer coating comprises the steps of uniformly mixing the coconut fiber with the length of 12mm, the cellulose, the cement, the silica fume, the oxidized polyethylene, the lightweight aggregate, the desulfurized gypsum and the retarder at the speed of 100-200 rpm. Specifically, the weight percentages of the components are shown in Table 8.
Table 8 weight percent (wt%) of the layer coating components in comparative example 2:
comparative example 3
The comparative example relates to a middle layer coating and a preparation method thereof, wherein the middle layer coating comprises the steps of uniformly mixing the coconut fiber length, the cellulose, the cement, the silica fume, the oxidized polyethylene, the lightweight aggregate, the desulfurized gypsum and the retarder at the speed of 100-200 rpm. Specifically, the weight percentages of the components are shown in Table 9.
Table 9 weight percent (wt%) of each component of the layer coating in comparative example 3:
| coconut fiber length 9mm | 2％ |
| Cellulose HK100000S | 0.35％ |
| Cement 42.5 | 45％ |
| 200 mesh silica fume | 10％ |
| Oxidized polyethylene (polyethylene glycol) | 0.6％ |
| Lightweight aggregate (Bai Zhidan 70-100 mesh) | 22％ |
| Desulfurized gypsum | 20％ |
| Retarder (HN-302) | 0.05％ |
| Totals to | 100％ |
Comparative example 4
The comparative example relates to a middle layer coating and a preparation method thereof, wherein the middle layer coating comprises the steps of uniformly mixing the coconut fiber length, the cellulose, the cement, the silica fume, the chlorinated polyethylene, the lightweight aggregate, the desulfurized gypsum and the retarder at the speed of 100-200 rpm. Specifically, the weight percentages of the components are shown in Table 10.
Table 10 weight percent (wt%) of each component of the layer coating in comparative example 4:
comparative example 5
The comparative example relates to a middle layer coating and a preparation method thereof, wherein the middle layer coating comprises the steps of uniformly mixing the cellulose, the cement, the silica fume, the oxidized polyethylene, the lightweight aggregate, the desulfurized gypsum and the retarder at the speed of 100-200 rpm. Specifically, the weight percentages of the components are shown in Table 11.
Table 11 weight percent (wt%) of the components of the middle layer coating in comparative example 5:
| cellulose HK100000S | 0.35％ |
| 42.5 Portland Cement | 45％ |
| 200 mesh silica fume | 10％ |
| Oxidized polyethylene (polyethylene glycol) | 1％ |
| Lightweight aggregate (vitrified microbead 70-100 mesh) | 23.6％ |
| Desulfurized gypsum | 20％ |
| Retarder (HN-302) | 0.05％ |
| Totals to | 100％ |
Test method
1. Test method of initial drying crack resistance: JG/T24-2000
2. Corrosion resistance testing method: GB/T10125-1997
3. The aging resistance testing method comprises the following steps: GB/T1865
4. Method for testing flexibility: JC/T1004-2006 tested as appendix B
5. Compressive strength method: 6.12 in JG/T283-2010
6. Thermal conductivity coefficient: GB/T10294-2008
The test results of each example and comparative example are detailed in table 12.
Table 12
As can be seen from Table 12, the addition of coir significantly increased the single pass application thickness and maintained the initial cracking resistance, but when using other lengths of coir, the single pass application thickness was reduced and the initial cracking resistance was also reduced, as was the case with the non-added coir material, both in the single pass batch and the initial cracking. The added compressive strength of the coir is obviously improved, and the compressive strength of the coir is reduced when chlorinated polyethylene is used. The added coconut fiber has obvious improvement on corrosion resistance and artificial aging resistance, and other plant fibers have poor effects in corrosion resistance and aging resistance. The addition of the coir has obvious improvement on flexibility, but the use of the coir with different lengths has reduced influence on the flexibility, and the use of the chlorinated polyethylene has obvious influence on the reduction of the flexibility. The addition of coir improves thermal insulation, but the use of different lengths of coir has a reduced impact on thermal insulation.
The cement in the formula is 45%, and the relationship between the coconut fiber and the compressive strength is as follows:
TABLE 13
| 9MM coir | Compressive strength MPa |
| 0％ | 2.8 |
| 1％ | 2.9 |
| 2％ | 3.4 |
| 3％ | 3.5 |
| 4％ | 3.7 |
| 5％ | 3.7 |
| 6％ | 3.8 |
As can be seen from the above table, the rate of rise of the added amount of coir is fastest between 0 and 2%, and later as the added amount of coir is further increased, the rate of rise of compressive strength is slowed down, and when it exceeds 4%, the rise of compressive strength is not significant. Therefore, the weight percentage of the coir is 1 to 4% in consideration of costs.
In summary, the present invention effectively overcomes the disadvantages of the prior art and has high industrial utility value.
While the invention has been described with respect to preferred embodiments thereof, it will be understood by those skilled in the art that various modifications and additions may be made without departing from the scope of the invention. Equivalent embodiments of the present invention will be apparent to those skilled in the art having the benefit of the teachings disclosed herein, when considered in the light of the foregoing disclosure, and without departing from the spirit and scope of the invention; meanwhile, any equivalent changes, modifications and evolution of the above embodiments according to the essential technology of the present invention still fall within the scope of the technical solution of the present invention.
Claims (10)
1. The thick anti-cracking middle layer coating comprises the following raw materials in percentage by weight:
2. the thick anti-cracking middle layer coating according to claim 1, wherein the raw materials of the coating comprise the following components in percentage by weight:
3. the thick anti-cracking middle layer coating of claim 1 or 2, wherein said coir has a length of 4 to 9mm;
and/or the diameter of the coconut fiber is 10-20 microns.
4. The thick anti-cracking middle layer coating of claim 1 or 2, wherein the cement is selected from the group consisting of portland cements; the cement is preferably Portland cement No. 42.5.
5. The thick anti-cracking middle layer coating of claim 1 or 2, wherein the oxidized polyethylene has a molecular weight of 1000 to 1500.
6. The thick anti-cracking middle layer coating according to claim 1 or 2, wherein the lightweight aggregate is selected from one or more of vitrified microbeads and polyphenyl particles; preferably, the mesh number of the lightweight aggregate is 70-100 mesh.
7. The thick anti-cracking middle layer coating of claim 1 or 2, wherein the retarder is selected from one or more of the group consisting of protein retarder hydroxy acid salts and phosphate salts.
8. The thick anti-cracking middle layer coating of claim 1 or 2, wherein the cellulose is selected from one or more of hydroxypropyl methylcellulose, hydroxyethyl cellulose; the molecular weight of the cellulose is 3 ten thousand to 10 ten thousand.
9. A method of preparing a thick anti-cracking middle layer coating as claimed in any one of claims 1 to 8, comprising mixing coconut fiber, cement, silica fume, oxidized polyethylene, lightweight aggregate, desulphurized gypsum, retarder, cellulose.
10. Use of the thick anti-cracking middle layer coating of any one of claims 1-8 in the construction field.
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