Fireproof plate with high corrosion resistance

Abstract

The invention relates to the technical field of fireproof plates, and provides a fireproof plate with high corrosion resistance. The fireproof plate is prepared from the following raw material components in parts by weight: 60 parts of Portland cement, 8 to 12 parts of refractory fiber, 10 to 20 parts of pyrophyllite powder, 8 to 16 parts of functional aggregate, 5 to 8 parts of epoxy resin, 0.5 to 1.5 parts of curing agent, 12 to 16 parts of flame retardant and 20 parts of water, the functional aggregate comprises zirconite powder and calcium metaborate in a weight ratio of (1: 9)-(9: 1). By means of the technical scheme, the problem that in the related technology, a fireproof plate is poor in breaking strength is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of fireproof boards, and in particular to a fireproof board with strong corrosion resistance. Background Art

[0002] Fireproof panels, as an important building material, are widely used in construction, decoration, shipbuilding, and other fields. Their fireproofing performance is directly related to the safety of people's lives and property. With the rapid development of the construction industry, the performance requirements for fireproof panels are becoming increasingly stringent. Not only must they have excellent fireproofing properties, but they must also have high flexural strength to adapt to complex and changing operating environments.

[0003] Traditional fireproof panels are primarily based on silicate cement, with refractory fibers and flame retardants added to create silicate fireproof panels. Calcium silicate fireproof panels, due to their excellent weather resistance, waterproofing, and sound absorption properties, are widely used in firewalls and partition walls in high-rise buildings and industrial plants. However, silicate fireproof panels are subject to significant pressure during use. Due to their insufficient flexural strength in practical applications, they are prone to fracture when subjected to external stress, impacting their service life and safety.

[0004] Therefore, developing a fireproof board with higher flexural strength is of great significance for extending the service life of the fireproof board and protecting people's lives. Summary of the Invention

[0005] The present invention provides a fireproof board with strong corrosion resistance, which solves the problem of poor flexural strength of the fireproof board in the related art.

[0006] The technical solutions of the present invention are as follows: The present invention provides a fireproof board with strong corrosion resistance, the raw materials of which include the following components in parts by weight: 60 parts of Portland cement, 8-12 parts of refractory fiber, 10-20 parts of pyrophyllite powder, 8-16 parts of functional aggregate, 5-8 parts of epoxy resin, 0.5-1.5 parts of curing agent, 12-16 parts of flame retardant, and 20 parts of water; The functional aggregate comprises zircon powder and calcium metaborate in a weight ratio of 1:9 to 9:1.

[0007] As a further technical solution, the weight ratio of the zircon powder to calcium metaborate is 2~4:1.

[0008] In the fireproof board obtained by the present invention, the content ratio of zircon powder and calcium metaborate is adjusted. The weight ratio of zircon powder and calcium metaborate is 1:9~9:1, for example, it can be 1:9, 1:5, 1:4, 1:3, 1:1, 2:1, 3:1, 4:1, 5:1, 7:1, 9:1, preferably 1:9, 2:1, 4:1, 9:1, more preferably 2:1, 4:1. When the weight ratio of zircon powder and calcium metaborate is 2~4:1, the flexural strength of the fireproof board can be further improved, so that the flexural strength of the fireproof board is increased to more than 12.1 MPa.

[0009] As a further technical solution, the raw materials further include 6 to 10 parts of expansion material; The expansion material includes one or more of expanded graphite, expanded vermiculite, expanded perlite, and hollow floating beads.

[0010] In the fireproof board that the present invention obtains, expansion material is also added, and expansion occurs when encountering high temperature, effectively stops the transmission of heat, improves the fireproof and heat-insulating performance of the fireproof board as a whole, joins in the fireproof board simultaneously and helps to reduce the weight of the fireproof board, makes it easy to use.Wherein expansion can be one or more expansion materials of those skilled in the art, for example, can be expanded graphite, expanded vermiculite, expanded perlite, hollow floating beads, preferably expanded vermiculite, hollow floating beads.When the expansion material comprises expanded vermiculite, hollow floating beads, the weight ratio of expanded vermiculite and hollow floating beads is 2~4:1, for example, can be 2:1,3:1,4:1, preferably 3:1.

[0011] As a further technical solution, the pyrophyllite powder is modified pyrophyllite powder; The raw materials of the modified pyrophyllite powder include pyrophyllite powder, hydroxyethylidene diphosphonic acid and polyvinyl butyral.

[0012] In the fireproof board obtained by the present invention, pyrophyllite powder is modified by using hydroxyethylidene diphosphonic acid and polyvinyl butyral. When the pyrophyllite powder is dispersed in the matrix component of silicate cement, the interface bonding between the pyrophyllite powder and the silicate cement and other components in the fireproof board can be improved to form a relatively dense structure. While maintaining the good flexural strength of the fireproof board, it can effectively prevent corrosive substances from penetrating into the interior of the fireproof board, thereby improving the corrosion resistance of the fireproof board.

[0013] As a further technical solution, the weight ratio of the hydroxyethylidene diphosphonic acid and polyvinyl butyral to the pyrophyllite powder is 3 to 8:30, for example, it can be 3:30, 4:30, 5:30, 6:30, 7:30, 8:30, preferably 4:30, 6:30.

[0014] As a further technical solution, the weight ratio of the hydroxyethylidene diphosphonic acid to polyvinyl butyral is 1:3.

[0015] In the fireproof board obtained by the present invention, when the weight ratio of the sum of hydroxyethylidene diphosphonic acid and polyvinyl butyral to pyrophyllite powder is 4-6:30, and the weight ratio of hydroxyethylidene diphosphonic acid and polyvinyl butyral is 1:3, the corrosion resistance of the fireproof board can be further improved. When the weight ratio of the sum of hydroxyethylidene diphosphonic acid and polyvinyl butyral to pyrophyllite powder is outside the range of 4-6:30, the corrosion resistance of the fireproof board is relatively poor.

[0016] As a further technical solution, the preparation method of the modified pyrophyllite powder comprises the following steps: A1, after dispersing the pyrophyllite powder in water, adding the hydroxyethylidene diphosphonic acid, mixing evenly, concentrating, and drying to obtain pretreated pyrophyllite powder; A2. Dispersing the polyvinyl butyral in acetone, adding the pretreated pyrophyllite powder, mixing evenly, concentrating, and drying to obtain the modified pyrophyllite powder.

[0017] As a further technical solution, in step A1, when the mixing is uniform, stirring is performed at 50-60° C. at a stirring speed of 300-400 r / min for 20-40 min.

[0018] As a further technical solution, in step A2, when the mixing is uniform, stirring is performed at 40-50° C. and a stirring speed of 100-200 r / min for 1-2 hours.

[0019] As a further technical solution, the refractory fiber includes one or more of carbon fiber, basalt fiber, and asbestos, preferably basalt fiber.

[0020] As a further technical solution, the curing agent includes one or both of ethylenediamine and triethylenetetramine, preferably triethylenetetramine.

[0021] As a further technical solution, the flame retardant includes one or more of melamine, dicyandiamide, and diphenyl phosphate, preferably melamine.

[0022] The present invention provides a method for preparing a fireproof board with strong corrosion resistance, which is used to prepare the fireproof board with strong corrosion resistance, comprising the following steps: S1. After blending the raw materials other than the curing agent and water, add the curing agent and water, mix well, and obtain a slurry; S2. Add the slurry into a mold, solidify and shape it, demould it, and maintain it to obtain a fireproof board.

[0023] As a further technical solution, in step S2, during the curing process, the temperature is 30-50°C, the relative humidity is 70%-80%, and the time is 24-30 hours; During the curing, the temperature is 30-50° C., the relative humidity is 70%-80%, and the time is 24-30 hours.

[0024] The working principle and beneficial effects of the present invention are: 1. In the present invention, silicate cement is used as the main base material, which can give the fireproof board a stable structure. Combined with refractory fiber, pyrophyllite powder, functional aggregate, epoxy resin, curing agent and flame retardant, through the reasonable combination of various components, a fireproof board with a stable structure, good flame retardant properties and good flexural strength can be obtained.

[0025] 2. In the fireproof board obtained by the present invention, the functional aggregate formed by zircon powder and calcium metaborate is added to the fireproof board. By using zircon powder and calcium metaborate in combination, the stability of the internal structure of the fireproof board can be improved, so that it can better bear external stress, thereby improving the flexural strength of the fireproof board. DETAILED DESCRIPTION

[0026] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0027] In the following examples and comparative examples, the silicate cement is ordinary silicate cement, model PO32.5; the epoxy resin is bisphenol A epoxy resin, model DER330; the diameter of the basalt fiber is 17 μm and the length is 2 mm; the average particle size of the pyrophyllite powder is 45 μm; the average particle size of the zircon powder is 45 μm; the melamine, CAS number 108-78-1, has an active ingredient content of 98%; the average particle size of the expanded vermiculite is 1 mm; the average particle size of the hollow floating beads is 75 μm; and the model of the polyvinyl butyral is PVB B90.

[0028] Example 1 A method for preparing a fireproof board with strong corrosion resistance comprises the following steps: S1. Blend 60 parts of Portland cement, 8 parts of basalt fiber, 10 parts of pyrophyllite powder, 0.8 parts of zircon powder, 7.2 parts of calcium metaborate, 5 parts of epoxy resin, and 12 parts of melamine, then add 0.5 parts of triethylenetetramine and 20 parts of water, mix well, and obtain a slurry; S2. Add the slurry into a mold, solidify and shape it at 30°C and a relative humidity of 70% for 30 hours, demould it, and cure it at 30°C and a relative humidity of 70% for 30 hours to obtain a fireproof board.

[0029] Example 2 A method for preparing a fireproof board with strong corrosion resistance comprises the following steps: S1, after blending 60 parts of Portland cement, 8 parts of basalt fiber, 10 parts of pyrophyllite powder, 0.8 part of zircon powder, 7.2 parts of calcium metaborate, 5 parts of epoxy resin, 4.5 parts of expanded vermiculite, 1.5 parts of hollow floating beads and 12 parts of melamine, 0.5 part of triethylenetetramine and 20 parts of water were added, and mixed uniformly to obtain a slurry; S2. Add the slurry into a mold, solidify and shape it at 30°C and a relative humidity of 70% for 30 hours, demould it, and cure it at 30°C and a relative humidity of 70% for 30 hours to obtain a fireproof board.

[0030] Example 3 A method for preparing a fireproof board with strong corrosion resistance comprises the following steps: S1, after blending 60 parts of Portland cement, 10 parts of basalt fiber, 15 parts of pyrophyllite powder, 6 parts of zircon powder, 6 parts of calcium metaborate, 7 parts of epoxy resin, 6 parts of expanded vermiculite, 2 parts of hollow floating beads and 14 parts of melamine, 1 part of triethylenetetramine and 20 parts of water were added, and mixed uniformly to obtain a slurry; S2. Add the slurry into a mold, solidify and shape it at 45°C and a relative humidity of 75% for 28 hours, demould it, and cure it at 45°C and a relative humidity of 75% for 28 hours to obtain a fireproof board.

[0031] Example 4 A method for preparing a fireproof board with strong corrosion resistance comprises the following steps: S1, after blending 60 parts of Portland cement, 12 parts of basalt fiber, 20 parts of pyrophyllite powder, 14.4 parts of zircon powder, 1.6 parts of calcium metaborate, 8 parts of epoxy resin, 7.5 parts of expanded vermiculite, 2.5 parts of hollow floating beads and 16 parts of melamine, 1.5 parts of triethylenetetramine and 20 parts of water were added, and mixed uniformly to obtain a slurry; S2. Add the slurry into a mold, solidify and shape it at 50°C and 80% relative humidity for 24 hours, demould it, and cure it at 50°C and 80% relative humidity for 24 hours to obtain a fireproof board.

[0032] Example 5 The only difference between this embodiment and embodiment 3 is that in this embodiment, 10 parts of zircon powder and 2 parts of calcium metaborate are added.

[0033] Example 6 The only difference between this embodiment and embodiment 3 is that in this embodiment, 8 parts of zircon powder and 4 parts of calcium metaborate are added.

[0034] Example 7 The only difference between this embodiment and embodiment 3 is that in this embodiment, 9.6 parts of zircon powder and 2.4 parts of calcium metaborate are added.

[0035] Example 8 The pyrophyllite powder is modified pyrophyllite powder, and the preparation method of the modified pyrophyllite powder comprises the following steps: A1. Dispersing 30 parts of pyrophyllite powder in 50 parts of water, adding 0.75 parts of hydroxyethylidene diphosphonic acid, stirring at 55° C. and 360 r / min for 30 min, concentrating, and drying to obtain pretreated pyrophyllite powder; A2. Dispersing 2.25 parts of polyvinyl butyral in 50 parts of acetone, adding the above-mentioned pretreated pyrophyllite powder, stirring at 50° C. and a stirring speed of 150 r / min for 1.5 h, concentrating, and drying to obtain modified pyrophyllite powder; A method for preparing a fireproof board with strong corrosion resistance comprises the following steps: S1. 60 parts of Portland cement, 10 parts of basalt fiber, 15 parts of modified pyrophyllite powder, 9.6 parts of zircon powder, 2.4 parts of calcium metaborate, 7 parts of epoxy resin, 6 parts of expanded vermiculite, 2 parts of hollow floating beads and 14 parts of melamine were blended, and then 1 part of triethylenetetramine and 20 parts of water were added and mixed to obtain a slurry; S2. Add the slurry into a mold, solidify and shape it at 45°C and a relative humidity of 75% for 28 hours, demould it, and cure it at 45°C and a relative humidity of 75% for 28 hours to obtain a fireproof board.

[0036] Example 9 The only difference between this embodiment and embodiment 8 is that in the preparation method of the modified pyrophyllite powder in this embodiment, 2 parts of hydroxyethylidene diphosphonic acid and 6 parts of polyvinyl butyral are added.

[0037] Example 10 The only difference between this embodiment and embodiment 8 is that in the preparation method of the modified pyrophyllite powder in this embodiment, 1 part of hydroxyethylidene diphosphonic acid and 3 parts of polyvinyl butyral are added.

[0038] Example 11 The only difference between this embodiment and embodiment 8 is that in the preparation method of the modified pyrophyllite powder in this embodiment, 1.5 parts of hydroxyethylidene diphosphonic acid and 4.5 parts of polyvinyl butyral are added.

[0039] Example 12 The only difference between this embodiment and embodiment 8 is that the preparation method of the modified pyrophyllite powder in this embodiment is different, specifically: After dispersing 30 parts of pyrophyllite powder in 50 parts of water, 3 parts of hydroxyethylidene diphosphonic acid were added, and the mixture was stirred at 50°C and a stirring speed of 360 r / min for 2 hours, concentrated, and dried to obtain modified pyrophyllite powder.

[0040] Example 13 The only difference between this embodiment and embodiment 8 is that the preparation method of the modified pyrophyllite powder in this embodiment is different, specifically: 3 parts of polyvinyl butyral were dispersed in 50 parts of acetone, and 30 parts of pyrophyllite powder were added. The mixture was stirred at 50° C. and a stirring speed of 360 r / min for 2 hours, concentrated, and dried to obtain modified pyrophyllite powder.

[0041] Comparative Example 1 The only difference between this comparative example and Example 3 is that in this comparative example, the zircon powder is replaced by an equal amount of calcium metaborate.

[0042] Comparative Example 2 The only difference between this comparative example and Example 3 is that in this comparative example, calcium metaborate is replaced by an equal amount of zircon powder.

[0043] Comparative Example 3 The only difference between this comparative example and Example 3 is that in this comparative example, neither zircon powder nor calcium metaborate was added.

[0044] Experimental Example 1 The fireproof boards prepared in Examples 1 to 7 and Comparative Examples 1 to 3 were tested for flexural strength according to the determination method in GB / T 7019-2014 "Test Methods for Fiber Cement Products". During the test, the fireproof board specimens were square specimens with a thickness of 9 mm and a length × width of 250 mm × 250 mm. The loading speed was controlled so that the specimens broke within 30 seconds, and the failure load was read. The test results are shown in Table 1: Table 1 Flexural strength test results

[0045] Compared with Comparative Examples 1 to 3, the flexural strength of the fireproof boards prepared in Examples 1 to 7 is improved, indicating that the functional aggregates of zircon powder and calcium metaborate are added to the fireproof boards, and zircon powder and calcium metaborate have a synergistic effect. By using the two together, the flexural strength of the fireproof boards can be improved, so that the flexural strength can be increased to above 10.2 MPa.

[0046] Experimental Example 2 The fireproof board samples prepared in Examples 7 to 13 were placed in a 20% by mass hydrochloric acid solution at 60° C. and corroded for 48 hours. After being taken out and dried, the flexural strength test after corrosion was performed according to the above flexural strength test method. The test results are shown in Table 2: Table 2 Corrosion resistance test results

[0047] The flexural strength retention rates after corrosion of Examples 7 to 13 were calculated according to the formula: flexural strength retention rate after corrosion = flexural strength after corrosion / flexural strength before corrosion × 100%. Compared with Example 7 and Examples 12 to 13, the flexural strength retention rates after corrosion of the fireproof boards prepared in Examples 8 to 11 were improved, indicating that the modification of pyrophyllite powder with hydroxyethylidene diphosphonic acid and polyvinyl butyral can improve the corrosion resistance of the fireproof boards.

[0048] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A fireproof board with strong corrosion resistance, characterized in that: The raw materials include the following components in parts by weight: 60 parts of Portland cement, 8-12 parts of refractory fiber, 10-20 parts of pyrophyllite powder, 8-16 parts of functional aggregate, 5-8 parts of epoxy resin, 0.5-1.5 parts of curing agent, 12-16 parts of flame retardant, and 20 parts of water; The functional aggregate comprises zircon powder and calcium metaborate in a weight ratio of 1:9 to 9:

1.

2. A fireproof board with strong corrosion resistance according to claim 1, characterized in that: The weight ratio of the zircon powder to calcium metaborate is 2-4:

1.

3. A fireproof board with strong corrosion resistance according to claim 1, characterized in that: The raw materials also include 6 to 10 parts of expansion material; The expansion material includes one or more of expanded graphite, expanded vermiculite, expanded perlite, and hollow floating beads.

4. A fireproof board with strong corrosion resistance according to claim 1, characterized in that: The pyrophyllite powder is modified pyrophyllite powder; The raw materials of the modified pyrophyllite powder include pyrophyllite powder, hydroxyethylidene diphosphonic acid and polyvinyl butyral.

5. A fireproof board with strong corrosion resistance according to claim 4, characterized in that: The weight ratio of the hydroxyethylidene diphosphonic acid and polyvinyl butyral to the pyrophyllite powder is 3 to 8:

30.

6. A fireproof board with strong corrosion resistance according to claim 4, characterized in that: The preparation method of the modified pyrophyllite powder comprises the following steps: A1, after dispersing the pyrophyllite powder in water, adding the hydroxyethylidene diphosphonic acid, mixing evenly, concentrating, and drying to obtain pretreated pyrophyllite powder; A2. Dispersing the polyvinyl butyral in acetone, adding the pretreated pyrophyllite powder, mixing evenly, concentrating, and drying to obtain the modified pyrophyllite powder.

7. A fireproof board with strong corrosion resistance according to claim 1, characterized in that: The refractory fiber includes one or more of carbon fiber, basalt fiber, and asbestos.

8. The fireproof board with strong corrosion resistance according to claim 1, characterized in that: The curing agent includes one or both of ethylenediamine and triethylenetetramine.

9. The fireproof board with strong corrosion resistance according to claim 1, characterized in that: The flame retardant includes one or more of melamine, dicyandiamide, and diphenyl phosphate.

10. A method for preparing a fireproof board with strong corrosion resistance, for preparing a fireproof board with strong corrosion resistance as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: S1. After blending the raw materials other than the curing agent and water, add the curing agent and water, mix well, and obtain a slurry; S2. Add the slurry into a mold, solidify and shape it, demould it, and maintain it to obtain a fireproof board.

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