CN112552015A - Magnesium phosphate fireproof coating - Google Patents

Magnesium phosphate fireproof coating Download PDF

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Publication number
CN112552015A
CN112552015A CN202011477139.7A CN202011477139A CN112552015A CN 112552015 A CN112552015 A CN 112552015A CN 202011477139 A CN202011477139 A CN 202011477139A CN 112552015 A CN112552015 A CN 112552015A
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China
Prior art keywords
magnesium phosphate
fireproof coating
parts
phosphate
wollastonite
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
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CN202011477139.7A
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Chinese (zh)
Inventor
毕万利
关岩
谷晓峰
张毅
孙美硕
孙赫男
卢俊伯
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Liaoning Keda Zhongchi Magnesium Building Material Technology Co ltd
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Liaoning Keda Zhongchi Magnesium Building Material Technology Co ltd
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Priority to CN202011477139.7A priority Critical patent/CN112552015A/en
Publication of CN112552015A publication Critical patent/CN112552015A/en
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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
    • C04B28/34—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 cold phosphate binders
    • 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
    • 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
    • C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength

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  • 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)
  • Paints Or Removers (AREA)

Abstract

The invention discloses a magnesium phosphate fireproof coating, which is prepared by taking ammonium dihydrogen phosphate, dead burned magnesia and expanded perlite as main raw materials through crushing, fine grinding and mixing. The magnesium phosphate fireproof coating provided by the invention has the advantages of wide raw material source, low price, high early strength and quick and convenient construction; wollastonite is doped into the fireproof coating, so that the high-temperature resistance of the magnesium phosphate fireproof coating is effectively improved, and the pollution to the environment is reduced; the polypropylene fiber is added into the magnesium phosphate fireproof coating, so that the bonding strength and the breaking strength of the magnesium phosphate fireproof coating are successfully improved.

Description

Magnesium phosphate fireproof coating
Technical Field
The invention relates to the field of refractory materials, in particular to a magnesium phosphate fireproof coating.
Background
The construction disasters include earthquake disasters, fires, flood disasters, and the like, wherein the fire is one of the construction disasters which have the greatest influence on the lives of people. The direct economic loss number of the fire in China is incredible, and especially after the building fire happens, the direct economic loss number of the fire in China can cause huge threats and aggressions to the life and property safety of people. In view of the huge losses and effects caused by building fires, we should pay sufficient attention to building fire prevention and fire resistance.
In a fire disaster, the carbon fiber cloth is adhered by epoxy glue to reinforce the reduction of the bearing capacity of the concrete structural member, and simultaneously the carbon fiber cloth is withdrawn, so that the high temperature resistance of the carbon fiber cloth is difficult to meet the design requirement. The fire-proof paint is used on the surface of flammable base material, can reduce the flammability of the surface of the material to be painted, can retard the rapid spread of fire, and is a special paint for improving the fire endurance of the material to be painted.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the magnesium phosphate fireproof coating which is low in price, quick in construction and excellent in high-temperature resistance.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the magnesium phosphate fireproof coating is characterized by comprising the following components in parts by weight:
5-15 parts of ammonium dihydrogen phosphate
25-35 parts of dead burned magnesia
15-35 parts of expanded perlite bulk material
0.25 to 0.35 portion of wollastonite
0.5 to 1.5 portions of borax
0.5-1 part of polypropylene fiber
15-25 parts of water
Step one, crushing the re-burnt magnesia with the formula amount into re-burnt magnesia particles with the particle size of 3-5mm in a crusher, and finely grinding the re-burnt magnesia particles in a ball mill for 30-60min to obtain re-burnt magnesia powder;
step two, pouring ammonium dihydrogen phosphate, borax and wollastonite in the formula amount and the dead burnt magnesium powder obtained in the step one into a ball milling tank, fine milling for 5-15min, and sieving with a 200-mesh sieve to obtain mixed powder;
pouring the mixed powder into a planetary mixer, adding 10-15 parts of water by weight, stirring for 2-5min, sequentially adding the polypropylene fibers and the rest water in the formula amount into the planetary mixer, and continuously stirring for 2-5min to obtain mixed slurry;
and step four, adding the expanded perlite bulk materials in the formula amount into the mixed slurry in parts by weight, and stirring for 2-5min to obtain the magnesium phosphate fireproof coating.
The ammonium dihydrogen phosphate is industrial grade ammonium dihydrogen phosphate, NH4H2PO4≥98%。
The borax is industrial grade borax Na2B4O7·10H2O≥95%。
The wollastonite is industrial-grade wollastonite, SiO2≥50%，CaO≥45%。
The MgO in the dead burnt magnesia is more than or equal to 90 percent.
The polypropylene fiber has the length of 2-5mm and the diameter of 25-50 μm.
The particle size of the expanded perlite bulk material is 1-2 mm.
The main chemical component of wollastonite is CaSiO3The magnesium phosphate coating has good high-temperature resistance, and can improve the high-temperature resistance of the magnesium phosphate coating; b in borax4O7 2-Ions and Mg in magnesium oxide2+A layer of precipitate film is generated by the reaction and covered on the surface of the magnesium oxide, so that the reaction time can be delayed, and the delayed coagulation effect is realized; the anti-cracking performance of the magnesium phosphate fireproof coating can be effectively improved by mixing a small amount of polypropylene fibers.
Compared with the prior art, the invention has the beneficial effects that: 1) the magnesium phosphate fireproof coating has the advantages of wide raw material source, low price, high early strength and quick and convenient construction; 2) wollastonite is doped into the fireproof coating, so that the high-temperature resistance of the magnesium phosphate fireproof coating is effectively improved, and the pollution to the environment is reduced; 3) the polypropylene fiber is added into the magnesium phosphate fireproof coating, so that the bonding strength and the breaking strength of the magnesium phosphate fireproof coating are successfully improved.
Drawings
FIG. 1 is a process flow diagram of an embodiment of the present invention.
Detailed Description
The pure grades of each raw material used in the following examples are shown in table 1 below.
TABLE 1 pure grades of the feedstocks
Figure 617535DEST_PATH_IMAGE001
The preparation process of the present invention is further illustrated by the following examples:
example 1:
crushing 250g of dead burnt magnesia into dead burnt magnesia particles with the particle size of 3-5mm in a crusher, and finely grinding the dead burnt magnesia particles in a ball mill for 30min to obtain dead burnt magnesia powder;
step two, pouring 80g of ammonium dihydrogen phosphate, 8g of borax, 2.5g of wollastonite and the dead burnt magnesium powder obtained in the step one into a ball milling tank, carrying out fine grinding for 8min, and sieving by a 200-mesh sieve to obtain mixed powder;
pouring the mixed powder into a planetary mixer, adding 150g of water, stirring for 3min, sequentially adding 8g of polypropylene fibers with the length of 4mm and the diameter of 40 mu m and 50g of water into the planetary mixer, and continuously stirring for 3min to obtain mixed slurry;
and step four, adding 250g of expanded perlite bulk material with the particle size of 2mm into the mixed slurry, and stirring for 3min to obtain the magnesium phosphate fireproof coating.
The magnesium phosphate fireproof coating prepared in the embodiment forms a magnesium phosphate fireproof layer on a wall body through wall body cleaning, wall body wetting, fireproof coating construction and maintenance. The density of the magnesium phosphate fireproof layer is 2g/cm3The fire resistance limit is 180min, the bonding strength is 1.0MPa, the dry shrinkage is 0.05 percent, and the combustion performance is A1 grade.
Example 2:
crushing 300g of dead burnt magnesia into dead burnt magnesia particles with the particle size of 3-5mm in a crusher, and finely grinding the dead burnt magnesia particles in a ball mill for 30min to obtain dead burnt magnesia powder;
pouring 100g of ammonium dihydrogen phosphate, 10g of borax, 3g of wollastonite and the dead burnt magnesium powder obtained in the step one into a ball milling tank, carrying out fine grinding for 8min, and sieving by a 200-mesh sieve to obtain mixed powder;
pouring the mixed powder into a planetary mixer, adding 150g of water, stirring for 4min, sequentially adding 9g of polypropylene fibers with the length of 4mm and the diameter of 40 mu m and 50g of water into the planetary mixer, and continuously stirring for 4min to obtain mixed slurry;
and step four, adding 300g of expanded perlite bulk material with the particle size of 2mm into the mixed slurry, and stirring for 4min to obtain the magnesium phosphate fireproof coating.
The magnesium phosphate fireproof coating prepared in the embodiment forms a magnesium phosphate fireproof layer on a wall body through wall body cleaning, wall body wetting, fireproof coating construction and maintenance. The density of the magnesium phosphate fireproof layer is 1.8g/cm3The fireproof limit is 200min, the bonding strength is 1.15MPa, the dry shrinkage is 0.045%, and the combustion performance is A1 grade.
Example 3:
crushing 350g of dead burnt magnesia into dead burnt magnesia particles with the particle size of 3-5mm in a crusher, and finely grinding the dead burnt magnesia particles in a ball mill for 30min to obtain dead burnt magnesia powder;
step two, pouring 150g of ammonium dihydrogen phosphate, 15g of borax, 3.5g of wollastonite and the dead burnt magnesium powder obtained in the step one into a ball milling tank, carrying out fine grinding for 8min, and sieving by a 200-mesh sieve to obtain mixed powder;
pouring the mixed powder into a planetary mixer, adding 150g of water, stirring for 2min, sequentially adding 10g of polypropylene fibers with the length of 4mm and the diameter of 40 mu m and 50g of water into the planetary mixer, and continuously stirring for 2min to obtain mixed slurry;
and step four, adding 350g of expanded perlite bulk material with the particle size of 2mm into the mixed slurry, and stirring for 2min to obtain the magnesium phosphate fireproof coating.
The magnesium phosphate fireproof coating prepared in the embodiment forms a magnesium phosphate fireproof layer on a wall body through wall body cleaning, wall body wetting, fireproof coating construction and maintenance. The density of the magnesium phosphate fireproof layer is 1.78g/cm3The fireproof limit is 220min, the bonding strength is 1.72MPa, the dry shrinkage is 0.043%, and the combustion performance is A1 grade.

Claims (7)

1. The magnesium phosphate fireproof coating is characterized by comprising the following components in parts by weight:
5-15 parts of ammonium dihydrogen phosphate
25-35 parts of dead burned magnesia
15-35 parts of expanded perlite bulk material
0.25 to 0.35 portion of wollastonite
0.5 to 1.5 portions of borax
0.5-1 part of polypropylene fiber
15-25 parts of water
Step one, crushing the re-burnt magnesia with the formula amount into re-burnt magnesia particles with the particle size of 3-5mm in a crusher, and finely grinding the re-burnt magnesia particles in a ball mill for 30-60min to obtain re-burnt magnesia powder;
step two, pouring ammonium dihydrogen phosphate, borax and wollastonite in the formula amount and the dead burnt magnesium powder obtained in the step one into a ball milling tank, fine milling for 5-15min, and sieving with a 200-mesh sieve to obtain mixed powder;
pouring the mixed powder into a planetary mixer, adding 10-15 parts of water by weight, stirring for 2-5min, sequentially adding the polypropylene fibers and the rest water in the formula amount into the planetary mixer, and continuously stirring for 2-5min to obtain mixed slurry;
and step four, adding the expanded perlite bulk materials in the formula amount into the mixed slurry in parts by weight, and stirring for 2-5min to obtain the magnesium phosphate fireproof coating.
2. The magnesium phosphate fireproof coating of claim 1, wherein the ammonium dihydrogen phosphate is technical grade ammonium dihydrogen phosphate, NH4H2PO4≥98%。
3. The magnesium phosphate fireproof coating of claim 1, wherein the borax is technical grade borax, Na2B4O7·10H2O≥95%。
4. The magnesium phosphate fireproof paint of claim 1, wherein the wollastonite is industrial grade wollastonite, SiO2≥50%，CaO≥45%。
5. The magnesium phosphate fireproof coating as claimed in claim 1, wherein MgO in the dead burned magnesite is greater than or equal to 90%.
6. The magnesium phosphate fire retardant coating according to claim 1, wherein the polypropylene fiber has a length of 2-5mm and a diameter of 25-50 μm.
7. The magnesium phosphate fireproof paint according to claim 1, wherein the particle size of the expanded perlite bulk material is 1-2 mm.
CN202011477139.7A 2020-12-15 2020-12-15 Magnesium phosphate fireproof coating Pending CN112552015A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115029023A (en) * 2022-06-13 2022-09-09 西南科技大学 Chemical bonding type fireproof anticorrosive paint for steel structure and preparation method thereof

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110723955A (en) * 2019-12-03 2020-01-24 山东鲁阳节能材料股份有限公司 Fireproof material and preparation method thereof

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110723955A (en) * 2019-12-03 2020-01-24 山东鲁阳节能材料股份有限公司 Fireproof material and preparation method thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
注册消防工程师资格考试用书编委会主编: "《消防安全技术实务》", 30 June 2017, 电子科技大学出版社 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115029023A (en) * 2022-06-13 2022-09-09 西南科技大学 Chemical bonding type fireproof anticorrosive paint for steel structure and preparation method thereof

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Application publication date: 20210326