CN109456627A - A kind of fireproof flame-retardant coating and preparation method thereof - Google Patents

A kind of fireproof flame-retardant coating and preparation method thereof Download PDF

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Publication number
CN109456627A
CN109456627A CN201811266980.4A CN201811266980A CN109456627A CN 109456627 A CN109456627 A CN 109456627A CN 201811266980 A CN201811266980 A CN 201811266980A CN 109456627 A CN109456627 A CN 109456627A
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parts
fireproof flame
retardant coating
filler
thickener
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曾金菊
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
    • C09D1/02—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances alkali metal silicates
    • C09D1/04—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances alkali metal silicates with organic additives
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/18—Fireproof paints including high temperature resistant paints
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/63—Additives non-macromolecular organic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Fireproofing Substances (AREA)
  • Paints Or Removers (AREA)

Abstract

The invention discloses a kind of fireproof flame-retardant coatings, including following parts by weight of component: 40-70 parts of waterglass, 20-30 parts of filler, 10-20 parts of expanded vermiculite, disubstituted azanol 5-10 parts, 1-10 parts of melamine, 5-10 parts of ammonium polyphosphate, 5-10 parts of the eleventh of the twelve Earthly Branches tetrol, 50-150 parts of water, 5-10 parts of thickener of season.A kind of preparation method of fireproof flame-retardant coating, the following steps are included: 1) water, waterglass, disubstituted azanol, melamine, ammonium polyphosphate and season the eleventh of the twelve Earthly Branches tetrol are added in centrifugal mixer device, it is warming up to 120-140 DEG C and at the uniform velocity stirs 15min, be cooled to room temperature holding；2) in solution, 2h will be stirred by ultrasonic under the conditions of 30-40 DEG C of temperature in filler and expanded vermiculite investment step 1)；3) slurry pH value is adjusted to pH=7-8；4) centrifugal mixer after addition thickener, is sieved to obtain the final product.Fireproof flame-retardant effect of the present invention is excellent, and raw material sources are extensive, cheap, preparation process is simple, easy to operate, reduces production and processing cost.

Description

A kind of fireproof flame-retardant coating and preparation method thereof
Technical field
The present invention relates to anti-flaming dope, specifically a kind of fireproof flame-retardant coating and preparation method thereof.
Background technique
Fire proofing material refers to that various prevent fires the modern times plays the role of material that is critical, being chiefly used in building.Commonly Fire proofing material includes fire-proof plate, fire resistant doorsets, flame resistant glass, fireproof coating fire prevention packet etc..Fireproof flame-retardant coating is its a kind of coating It can make the dedicated functionality coating of the combustible materials delayed combustion such as timber.Fireproof flame-retardant coating except have protection decoration function in addition to, Should mainly have prevents ground by the i.e. anti-flaming function of flame ignition；Prevent development, that is, fire-retardant function that ground burns or sluggishness is burnt Energy；Ground is isolated with heat source, temperature is avoided to increase i.e. heat insulating function etc..It is widely used in the friendship such as building, vehicle, aircraft, tire Logical tool and historical relic's protection, electric appliance, cable, warehouse, military project and aerospace etc..
Existing common anti-flaming dope has that carbonization time is short and fire endurance is short after heated.
Summary of the invention
The purpose of the present invention is to provide a kind of fireproof flame-retardant coatings, to solve the problems mentioned in the above background technology.
To achieve the above object, the invention provides the following technical scheme:
A kind of fireproof flame-retardant coating, including following parts by weight of component:
40-70 parts of waterglass, 20-30 parts of filler, 10-20 parts of expanded vermiculite, disubstituted azanol 5-10 parts, melamine 1- 10 parts, 5-10 parts of ammonium polyphosphate, 5-10 parts of the eleventh of the twelve Earthly Branches tetrol, 50-150 parts of water, 5-10 parts of thickener of season.
As a further solution of the present invention: 50-60 parts of waterglass, 22-28 parts of filler, 12-17 parts of expanded vermiculite, double to take For 7-8 parts of azanol, 4-6 parts of melamine, 7-8 parts of ammonium polyphosphate, 7-8 parts of the eleventh of the twelve Earthly Branches tetrol, 80-120 parts of water, 7-8 parts of thickener of season.
As a further solution of the present invention: 55 parts of waterglass, 25 parts of filler, 15 parts of expanded vermiculite, disubstituted azanol 8 Part, 5 parts of melamine, 7 parts of ammonium polyphosphate, 8 parts of the eleventh of the twelve Earthly Branches tetrol, 100 parts of water, 8 parts of thickener of season.
As a further solution of the present invention: the filler is one of titanium dioxide, sodium metasilicate fiber and Boron tribromide Or more than one compositions.
As a further solution of the present invention: the sodium metasilicate fiber is dusting sodium metasilicate fiber.
As a further solution of the present invention: the thickener is Silica hydrogel.
A kind of preparation method of fireproof flame-retardant coating, comprising the following steps:
1) water, waterglass, disubstituted azanol, melamine, ammonium polyphosphate and season the eleventh of the twelve Earthly Branches tetrol are added to centrifugal mixer dress In setting, it is warming up to 120-140 DEG C and at the uniform velocity stirs 15min, be cooled to room temperature holding；
2) in solution, 2h will be stirred by ultrasonic under the conditions of 30-40 DEG C of temperature in filler and expanded vermiculite investment step 1)；
3) slurry pH value is adjusted to pH=7-8；
4) centrifugal mixer after addition thickener, is sieved to obtain the final product.
Compared with prior art, the beneficial effects of the present invention are:
The present invention utilizes glass, filler, expanded vermiculite, disubstituted azanol, melamine, ammonium polyphosphate, season the eleventh of the twelve Earthly Branches tetrol, water It is excellent that fireproof flame-retardant coating fireproof flame-retardant effect obtained is reacted with thickener, and raw material sources are extensive, cheap, preparation process Simply, easy to operate, reduce production and processing cost；Various group partition inter-capacitives are preferable, it can be ensured that the storage of coating long period is equal Even stabilization；Preferred raw material simultaneously, the application also optimizes the content of each raw material, and control controls the reaction temperature of each step, time Etc. parameters, so that each raw material is acted synergistically, greatly improve the flame retardant effect and stability of fire retardant of the present invention.
Specific embodiment
The technical scheme in the embodiments of the invention will be clearly and completely described below, it is clear that described implementation Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common Technical staff's every other embodiment obtained without making creative work belongs to the model that the present invention protects It encloses.
Embodiment 1
A kind of fireproof flame-retardant coating, including following parts by weight of component:
40 parts of waterglass, 20 parts of filler, 1 part of expanded vermiculite, 5 parts of disubstituted azanol, 1 part of melamine, ammonium polyphosphate 5 Part, 5 parts of the eleventh of the twelve Earthly Branches tetrol, 50 parts of water, 5 parts of thickener of season.
A kind of preparation method of fireproof flame-retardant coating, comprising the following steps:
1) water, waterglass, disubstituted azanol, melamine, ammonium polyphosphate and season the eleventh of the twelve Earthly Branches tetrol are added to centrifugal mixer dress In setting, it is warming up to 120-140 DEG C and at the uniform velocity stirs 15min, be cooled to room temperature holding；
2) in solution, 2h will be stirred by ultrasonic under the conditions of 30-40 DEG C of temperature in filler and expanded vermiculite investment step 1)；
3) slurry pH value is adjusted to pH=7-8；
4) centrifugal mixer after addition thickener, is sieved to obtain the final product.
Embodiment 2
A kind of fireproof flame-retardant coating, including following parts by weight of component:
50 parts of waterglass, 22 parts of filler, 12 parts of expanded vermiculite, 7 parts of disubstituted azanol, 4 parts of melamine, ammonium polyphosphate 7 Part, 7 parts of the eleventh of the twelve Earthly Branches tetrol, 80 parts of water, 7 parts of thickener of season.
A kind of preparation method of fireproof flame-retardant coating, comprising the following steps:
1) water, waterglass, disubstituted azanol, melamine, ammonium polyphosphate and season the eleventh of the twelve Earthly Branches tetrol are added to centrifugal mixer dress In setting, it is warming up to 120-140 DEG C and at the uniform velocity stirs 15min, be cooled to room temperature holding；
2) in solution, 2h will be stirred by ultrasonic under the conditions of 30-40 DEG C of temperature in filler and expanded vermiculite investment step 1)；
3) slurry pH value is adjusted to pH=7-8；
4) centrifugal mixer after addition thickener, is sieved to obtain the final product.
Embodiment 3
A kind of fireproof flame-retardant coating, including following parts by weight of component:
55 parts of waterglass, 25 parts of filler, 15 parts of expanded vermiculite, 8 parts of disubstituted azanol, 5 parts of melamine, ammonium polyphosphate 7 Part, 8 parts of the eleventh of the twelve Earthly Branches tetrol, 100 parts of water, 8 parts of thickener of season.
A kind of preparation method of fireproof flame-retardant coating, comprising the following steps:
1) water, waterglass, disubstituted azanol, melamine, ammonium polyphosphate and season the eleventh of the twelve Earthly Branches tetrol are added to centrifugal mixer dress In setting, it is warming up to 120-140 DEG C and at the uniform velocity stirs 15min, be cooled to room temperature holding；
2) in solution, 2h will be stirred by ultrasonic under the conditions of 30-40 DEG C of temperature in filler and expanded vermiculite investment step 1)；
3) slurry pH value is adjusted to pH=7-8；
4) centrifugal mixer after addition thickener, is sieved to obtain the final product.
Embodiment 4
A kind of fireproof flame-retardant coating, including following parts by weight of component:
60 parts of waterglass, 28 parts of filler, 17 parts of expanded vermiculite, 8 parts of disubstituted azanol, 6 parts of melamine, ammonium polyphosphate 8 Part, 8 parts of the eleventh of the twelve Earthly Branches tetrol, 120 parts of water, 8 parts of thickener of season.
A kind of preparation method of fireproof flame-retardant coating, comprising the following steps:
1) water, waterglass, disubstituted azanol, melamine, ammonium polyphosphate and season the eleventh of the twelve Earthly Branches tetrol are added to centrifugal mixer dress In setting, it is warming up to 120-140 DEG C and at the uniform velocity stirs 15min, be cooled to room temperature holding；
2) in solution, 2h will be stirred by ultrasonic under the conditions of 30-40 DEG C of temperature in filler and expanded vermiculite investment step 1)；
3) slurry pH value is adjusted to pH=7-8；
4) centrifugal mixer after addition thickener, is sieved to obtain the final product.
Embodiment 5
A kind of fireproof flame-retardant coating, including following parts by weight of component:
70 parts of waterglass, 30 parts of filler, 20 parts of expanded vermiculite, 10 parts of disubstituted azanol, 10 parts of melamine, ammonium polyphosphate 10 parts, 10 parts of the eleventh of the twelve Earthly Branches tetrol, 150 parts of water, 10 parts of thickener of season.
A kind of preparation method of fireproof flame-retardant coating, comprising the following steps:
1) water, waterglass, disubstituted azanol, melamine, ammonium polyphosphate and season the eleventh of the twelve Earthly Branches tetrol are added to centrifugal mixer dress In setting, it is warming up to 120-140 DEG C and at the uniform velocity stirs 15min, be cooled to room temperature holding；
2) in solution, 2h will be stirred by ultrasonic under the conditions of 30-40 DEG C of temperature in filler and expanded vermiculite investment step 1)；
3) slurry pH value is adjusted to pH=7-8；
4) centrifugal mixer after addition thickener, is sieved to obtain the final product.
Comparative example 1
A kind of fireproof flame-retardant coating, including following parts by weight of component:
55 parts of waterglass, 25 parts of titanium dioxide, 15 parts of expanded vermiculite, 8 parts of disubstituted azanol, 5 parts of melamine, ammonium polyphosphate 7 parts, 8 parts of the eleventh of the twelve Earthly Branches tetrol, 100 parts of water, 8 parts of thickener of season.
A kind of preparation method of fireproof flame-retardant coating, comprising the following steps:
1) water, waterglass, disubstituted azanol, melamine, ammonium polyphosphate and season the eleventh of the twelve Earthly Branches tetrol are added to centrifugal mixer dress In setting, it is warming up to 120-140 DEG C and at the uniform velocity stirs 15min, be cooled to room temperature holding；
2) in solution, 2h will be stirred by ultrasonic under the conditions of 30-40 DEG C of temperature in filler and expanded vermiculite investment step 1)；
3) slurry pH value is adjusted to pH=7-8；
4) centrifugal mixer after addition thickener, is sieved to obtain the final product.
Comparative example 2
A kind of fireproof flame-retardant coating, including following parts by weight of component:
55 parts of waterglass, 25 parts of sodium metasilicate fiber, 15 parts of expanded vermiculite, 8 parts of disubstituted azanol, 5 parts of melamine, poly- phosphorus 7 parts of sour ammonium, 8 parts of the eleventh of the twelve Earthly Branches tetrol, 100 parts of water, 8 parts of thickener of season.
A kind of preparation method of fireproof flame-retardant coating, comprising the following steps:
1) water, waterglass, disubstituted azanol, melamine, ammonium polyphosphate and season the eleventh of the twelve Earthly Branches tetrol are added to centrifugal mixer dress In setting, it is warming up to 120-140 DEG C and at the uniform velocity stirs 15min, be cooled to room temperature holding；
2) in solution, 2h will be stirred by ultrasonic under the conditions of 30-40 DEG C of temperature in filler and expanded vermiculite investment step 1)；
3) slurry pH value is adjusted to pH=7-8；
4) centrifugal mixer after addition thickener, is sieved to obtain the final product.
Comparative example 3
A kind of fireproof flame-retardant coating, including following parts by weight of component:
55 parts of waterglass, 25 parts of Boron tribromide, 15 parts of expanded vermiculite, 8 parts of disubstituted azanol, 5 parts of melamine, polyphosphoric acid 7 parts of ammonium, 8 parts of the eleventh of the twelve Earthly Branches tetrol, 100 parts of water, 8 parts of thickener of season.
A kind of preparation method of fireproof flame-retardant coating, comprising the following steps:
1) water, waterglass, disubstituted azanol, melamine, ammonium polyphosphate and season the eleventh of the twelve Earthly Branches tetrol are added to centrifugal mixer dress In setting, it is warming up to 120-140 DEG C and at the uniform velocity stirs 15min, be cooled to room temperature holding；
2) in solution, 2h will be stirred by ultrasonic under the conditions of 30-40 DEG C of temperature in filler and expanded vermiculite investment step 1)；
3) slurry pH value is adjusted to pH=7-8；
4) centrifugal mixer after addition thickener, is sieved to obtain the final product.
Comparative example 4
A kind of fireproof flame-retardant coating, including following parts by weight of component:
55 parts of waterglass, 25 parts of filler, 15 parts of expanded vermiculite, 8 parts of disubstituted azanol, 5 parts of melamine, ammonium polyphosphate 7 Part, 8 parts of the eleventh of the twelve Earthly Branches tetrol, 100 parts of water, 8 parts of thickener of season.
A kind of preparation method of fireproof flame-retardant coating, comprising the following steps:
1) water, waterglass, disubstituted azanol, melamine, ammonium polyphosphate and season the eleventh of the twelve Earthly Branches tetrol are added to centrifugal mixer dress In setting, room temperature at the uniform velocity stirs 15min；
2) in solution, 2h will be stirred by ultrasonic in filler and expanded vermiculite investment step 1)；
3) slurry pH value is adjusted to pH=7-8；
4) centrifugal mixer after addition thickener, is sieved to obtain the final product.
The resulting anti-flaming dope performance indicator of embodiment 1-5 and comparative example 1-4 is as shown in table 1:
Table 1
Testing result is as listed in Table 1: from test result as can be seen that in embodiment 1-5 formula in each component content Variation, expansion multiplying power, carbonization time, fire endurance, carbon yield, Heat liberation unit and cigarette yield can change therewith；Pass through comparison Example 1-3 is compared with embodiment 3 respectively it can be found that the selection difference of wire feeding is for expansion multiplying power, carbonization time, fire resisting pole Limit, carbon yield, Heat liberation unit and cigarette yield can also be influenced, while from the point of view of control, and the difference of this performance is also to combine respectively Component is to pass through each component synergistic effect acquisition；By the comparison respectively of comparative example 4 and embodiment 3 it can be found that preparation When temperature selection also can shadow for expansion multiplying power, carbonization time, fire endurance, carbon yield, Heat liberation unit and cigarette yield It rings.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims Variation is included within the present invention.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art The other embodiments being understood that.

Claims (7)

1. a kind of fireproof flame-retardant coating, which is characterized in that including following parts by weight of component:
40-70 parts of waterglass, 20-30 parts of filler, 10-20 parts of expanded vermiculite, disubstituted azanol 5-10 parts, melamine 1-10 Part, 5-10 parts of ammonium polyphosphate, 5-10 parts of the eleventh of the twelve Earthly Branches tetrol, 50-150 parts of water, 5-10 parts of thickener of season.
2. a kind of fireproof flame-retardant coating according to claim 1, which is characterized in that 50-60 parts of waterglass, filler 22-28 Part, 12-17 parts of expanded vermiculite, disubstituted azanol 7-8 parts, 4-6 parts of melamine, 7-8 parts of ammonium polyphosphate, 7-8 parts of the eleventh of the twelve Earthly Branches tetrol of season, 80-120 parts of water, 7-8 parts of thickener.
3. a kind of fireproof flame-retardant coating according to claim 1, which is characterized in that 55 parts of waterglass, 25 parts of filler, expansion 15 parts of vermiculite, 8 parts of disubstituted azanol, 5 parts of melamine, 7 parts of ammonium polyphosphate, 8 parts of the eleventh of the twelve Earthly Branches tetrol, 100 parts of water, 8 parts of thickener of season.
4. a kind of fireproof flame-retardant coating according to claim 1, which is characterized in that the thickener is Silica hydrogel.
5. any fireproof flame-retardant coating according to claims 1 to 4, which is characterized in that the filler is titanium dioxide, silicic acid One of sodium fiber and Boron tribromide or more than one compositions.
6. a kind of fireproof flame-retardant coating according to claim 5, which is characterized in that the sodium metasilicate fiber is dusting silicic acid Sodium fiber.
7. a kind of preparation method of fireproof flame-retardant coating, which comprises the following steps:
1) water, waterglass, disubstituted azanol, melamine, ammonium polyphosphate and season the eleventh of the twelve Earthly Branches tetrol are added in centrifugal mixer device, It is warming up to 120-140 DEG C and at the uniform velocity stirs 15min, be cooled to room temperature holding；
2) in solution, 2h will be stirred by ultrasonic under the conditions of 30-40 DEG C of temperature in filler and expanded vermiculite investment step 1)；
3) slurry pH value is adjusted to pH=7-8；
4) centrifugal mixer after addition thickener, is sieved to obtain the final product.
CN201811266980.4A 2018-10-29 2018-10-29 A kind of fireproof flame-retardant coating and preparation method thereof Withdrawn CN109456627A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110436809A (en) * 2019-09-06 2019-11-12 石家庄易辰防火保温材料有限公司 A kind of fire-type expanded vermiculite and preparation method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110436809A (en) * 2019-09-06 2019-11-12 石家庄易辰防火保温材料有限公司 A kind of fire-type expanded vermiculite and preparation method thereof

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