Non-intumescent fire retardant coating for steel structure and preparation method of non-intumescent fire retardant coating

Abstract

The invention discloses a non-intumescent fire retardant coating for a steel structure and a preparation method of the non-intumescent fire retardant coating, and solves the technical problems of low environmental protection property, relatively low bonding strength and relatively high surface density of part of existing fire retardant coatings. The environment-friendly building material is prepared from the following components in parts by mass: 75 to 100 parts of base material, 90 to 180 parts of aggregate, 10 to 15 parts of reinforced fiber, 8 to 15 parts of mica powder, 6 to 10 parts of pigment, 0.5 to 1.5 parts of flame retardant, 7 to 15 parts of water glass, 3.5 to 4 parts of attapulgite powder and 90 to 200 parts of water. The base material, the aggregate, the reinforced fiber, the mica powder, the pigment, the flame retardant, the water glass and the attapulgite powder are all inorganic components, do not contain toxic and harmful substances such as benzene, methylbenzene, dimethylbenzene and soluble heavy metal, are stable in property, are matched for use, do not generate harmful gas at high temperature, and are high in environmental protection property; the aggregate and the reinforcing fiber used in the invention are light materials, and the overall surface density of the fireproof coating is low; through the synergistic effect of the water glass, the mica powder and the attapulgite powder, the bonding strength of the fireproof coating is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of building fire protection, and in particular relates to a non-expansion fire retardant coating for steel structures and a preparation method thereof. Background Art

[0002] The structure of a high-rise building is generally a reinforced concrete structure, a steel structure, a steel-concrete composite structure, etc. Concrete structures have good fire resistance, and their fire resistance is mainly due to the concrete aggregate inside them. These concrete aggregates are usually hard, dense mineral materials with high fire resistance. The fire resistance of steel structures is relatively poor. Steel is a combustible material. At high temperatures, the strength and elastic modulus of steel will drop significantly, and may even cause structural damage. Therefore, for steel structure high-rise buildings, fire prevention measures are usually required, such as applying fire retardant coatings, setting up fire partitions, etc., to improve their fire resistance.

[0003] However, during the preparation process of some existing fire retardant coatings, the organic solvents used, the volatile organic compounds added, and some additives used contain toxic and harmful substances, which will release harmful gases, have low environmental protection, pollute the environment, and are not conducive to human health; some fire retardant coatings have a high surface density, which will increase the dead weight of the steel structure and have an adverse effect on the stability and safety of the steel structure building; some fire retardant coatings have a low bonding strength with the steel structure, which reduces the durability of the fire retardant coatings. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a non-expanding fire retardant coating for steel structure and a preparation method thereof, so as to solve the technical problems of low environmental protection, low bonding strength and high surface density of the existing fire retardant coating.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] A non-expanding fire retardant coating for steel structure, comprising the following components in parts by weight:

[0007]

[0008]

[0009] Furthermore, the base material is any one or more of silicate cement, refractory cement and silica sol.

[0010] Furthermore, the base material is silicate cement.

[0011] Furthermore, the aggregate is any one or more of expanded perlite, expanded vermiculite, fly ash, and vitrified microspheres.

[0012] Furthermore, the aggregates are expanded perlite and expanded vermiculite, and the ratio of expanded vermiculite to expanded perlite is 11-12:2.

[0013] Furthermore, the reinforcing fiber is any one or more of aluminum silicate fiber, ceramic fiber, glass fiber, rock wool, and mineral wool.

[0014] Furthermore, the reinforcing fiber is aluminum silicate fiber.

[0015] Furthermore, the pigment is titanium dioxide.

[0016] Furthermore, the flame retardant is aluminum silicate.

[0017] A method for preparing a non-expanding fire retardant coating for a steel structure comprises the following steps:

[0018] Step 1: weigh the raw materials in parts by weight;

[0019] Step 2: Turn on the mixer, add silicate cement, expanded perlite, expanded vermiculite, aluminum silicate fiber, mica powder, and titanium dioxide into the mixer and stir and pre-mix for 15-20 minutes;

[0020] Step 3: Add the prepared water into the mixer and stir for 25-35 minutes;

[0021] Step 4: Add aluminum silicate, attapulgite powder and water glass into a mixer and stir for 5-10 minutes;

[0022] Step 5: Discharge the slurry in the mixer into the colloid grinder for grinding, and the grinding time is 1.2-1.5h;

[0023] Step 6: The slurry in the grinder is discharged into a vibrating screen for filtration, and the impurities mixed in during the operation are filtered out to obtain the fire retardant coating.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The base material, aggregate, reinforcing fiber, mica powder, pigment, flame retardant, water glass and attapulgite powder used in the present invention are all inorganic components, do not contain benzene, toluene, xylene, soluble heavy metals such as lead, cadmium, chromium and other toxic and harmful substances, have stable properties, can be used in combination with each other, and do not generate harmful gases in a high-temperature environment, and are highly environmentally friendly; the aggregate and reinforcing fiber used in the present invention are all lightweight materials, and the overall surface density of the fire-retardant coating is low; the present invention improves the bonding strength of the fire-retardant coating through the synergistic effect of water glass, mica powder and attapulgite powder.

[0026] The base material of the present invention preferably uses silicate cement, which has the advantages of high fire resistance, high durability, excellent mechanical properties, high environmental protection, and high workability. Based on the high fire resistance of silicate cement, silicate cement can withstand deformation and damage in high temperature environments. The present invention applies it to fire-retardant coatings, which can significantly enhance the fire resistance of the coating and effectively prevent the spread of fire; based on the high durability of silicate cement, the present invention applies it to fire-retardant coatings, which can enable the fire-retardant coating to maintain the fireproof effect in complex environments; based on the excellent mechanical properties of silicate cement, the present invention applies it to fire-retardant coatings, which can enhance the folding resistance, compression resistance and bending resistance of the fire-retardant coating, so that the coating is not easily damaged when subjected to external forces; based on the high environmental protection of silicate cement, the present invention applies it to fire-retardant coatings, which can improve the environmental protection performance of the coating and reduce the impact of the coating on the environment; based on the high workability of silicate cement, the present invention applies it to fire-retardant coatings, which can facilitate the construction of the coating and improve the construction efficiency.

[0027] The aggregate of the present invention preferably uses expanded perlite and expanded vermiculite, and the ratio of expanded vermiculite to expanded perlite is 11-12:2. The interior of the expanded perlite is a honeycomb structure, which has the advantages of light weight, non-toxicity, high temperature resistance, and good thermal insulation performance. Expanded vermiculite has a layered structure, which has the advantages of light weight, non-toxicity, tastelessness, and high fire resistance. The present invention adds expanded perlite and expanded vermiculite as fillers to the fire retardant coating, which can increase the fire rating of the fire retardant coating while improving the environmental protection of the fire retardant coating. The inventor found that when the ratio of expanded vermiculite to expanded perlite is 5.5-6.0, the fire resistance of the fire retardant coating can be significantly improved.

[0028] The reinforcing fiber of the present invention preferably uses aluminum silicate fiber, which is a lightweight refractory material with the advantages of high temperature resistance, excellent heat insulation performance, good thermal stability, non-toxicity, strong resistance to mechanical vibration, and good chemical stability. The present invention adds aluminum silicate fiber to the fire retardant coating to enhance the fire retardant performance of the fire retardant coating, improve the environmental protection and corrosion resistance of the coating, and make the overall surface density of the coating lower.

[0029] The improvement of the bonding strength of the present invention is due to the synergistic effect of water glass, mica powder and attapulgite powder. Among them, water glass has good bonding and dispersibility. It is added to the fire retardant coating to disperse solid particles and improve the stability of the coating, which can enhance the fire retardant performance of the fire retardant coating, improve the adhesion of the fire retardant coating, improve the construction performance of the fire retardant coating, improve the fluidity and plasticity of the fire retardant coating, and make the fire retardant coating easy to construct; adding mica powder to the fire retardant coating can improve the fire retardant performance of the fire retardant coating, improve the water resistance of the fire retardant coating, enhance the mechanical strength of the fire retardant coating, improve the corrosion resistance of the fire retardant coating, and improve the bonding strength of the fire retardant coating. The attapulgite powder can expand to form a stable gel structure after absorbing water, improve the viscosity of the fire retardant coating, and thus enhance the bonding strength of the fire retardant coating.

[0030] The pigment of the present invention preferably uses titanium dioxide, which can improve the color of the fire retardant coating, so that the fire retardant coating presents a uniform and bright white color after coating, and titanium dioxide can enhance the ability of the fire retardant coating to resist ultraviolet rays and improve the weather resistance of the fire retardant coating. The flame retardant of the present invention preferably uses aluminum silicate, which can enhance the fire resistance of the fire retardant coating while improving the corrosion resistance, bonding strength, water resistance and durability of the fire retardant coating. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail as follows. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Example 1

[0033] 75 parts of Portland cement, 20 parts of expanded perlite, 110 parts of expanded vermiculite, 10 parts of aluminum silicate fiber, 8 parts of mica powder and 6 parts of titanium dioxide are added to a mixer and stirred for pre-mixing for 15 minutes; then 95 parts of water are added to the mixer and continued to stir for 27 minutes; then 0.6 parts of aluminum silicate, 2 parts of attapulgite powder and 8 parts of water glass are added to the mixer and continued to stir for 5 minutes; then, the slurry in the mixer is discharged into a colloid grinder for grinding for 1.3 hours; finally, the slurry in the grinder is discharged into a vibrating screen for filtration, and the impurities mixed in during the operation are filtered out to obtain the fire retardant coating.

[0034] Example 2

[0035] 80 parts of silicate cement, 25 parts of expanded perlite, 137.5 parts of expanded vermiculite, 12 parts of aluminum silicate fiber, 9 parts of mica powder, and 8 parts of titanium dioxide are added to a mixer and stirred for pre-mixing, and the stirring time is 17 minutes; then 112 parts of water are added to the mixer and continued to stir, and the stirring time is 25 minutes; then 0.5 parts of aluminum silicate and 10 parts of water glass are added to the mixer and continued to stir, and the stirring time is 7 minutes; then, the slurry in the mixer is discharged into a colloid grinder for grinding, and the grinding time is 1.2 hours; finally, the slurry in the grinder is discharged into a vibrating screen for filtration, and the impurities mixed in during the operation are filtered out, and the fire retardant coating is obtained.

[0036] Example 3

[0037] 90 parts of Portland cement, 15 parts of expanded perlite, 82.5 parts of expanded vermiculite, 13 parts of aluminum silicate fiber, 8.5 parts of mica powder, and 7 parts of titanium dioxide are added to a mixer and stirred for pre-mixing for 19 minutes; then 90 parts of water are added to the mixer and continued to stir for 26 minutes; then 1 part of aluminum silicate, 4 parts of attapulgite powder, and 9 parts of water glass are added to the mixer and continued to stir for 7.5 minutes; then, the slurry in the mixer is discharged into a colloid grinder for grinding for 1.35 hours; finally, the slurry in the grinder is discharged into a vibrating screen for filtration, and the impurities mixed in during the operation are filtered out to obtain the fire retardant coating.

[0038] Example 4

[0039] 100 parts of silicate cement, 10 parts of expanded perlite, 60 parts of expanded vermiculite, 11 parts of aluminum silicate fiber, 10 parts of mica powder, and 7.7 parts of titanium dioxide are added to a mixer and stirred for pre-mixing for 20 minutes; then 150 parts of water are added to the mixer and continued to stir for 28 minutes; then 1.2 parts of aluminum silicate, 2.5 parts of attapulgite powder, and 14 parts of water glass are added to the mixer and continued to stir for 9.5 minutes; then, the slurry in the mixer is discharged into a colloid grinder for grinding for 1.25 hours; finally, the slurry in the grinder is discharged into a vibrating screen for filtration, and the impurities mixed in during the operation are filtered out to obtain the fire retardant coating.

[0040] Example 5

[0041] 85 parts of silicate cement, 18 parts of expanded perlite, 108 parts of expanded vermiculite, 15 parts of aluminum silicate fiber, 9.5 parts of mica powder and 9 parts of titanium dioxide are added to a mixer and stirred for pre-mixing for 19.5 minutes; then 125 parts of water are added to the mixer and continued to stir for 26.5 minutes; then 0.7 parts of aluminum silicate, 3 parts of attapulgite powder and 13.5 parts of water glass are added to the mixer and continued to stir for 8.7 minutes; then, the slurry in the mixer is discharged into a colloid grinder for grinding for 1.4 hours; finally, the slurry in the grinder is discharged into a vibrating screen for filtration, and the impurities mixed in during the operation are filtered out to obtain the fire retardant coating.

[0042] Example 6

[0043] 95 parts of silicate cement, 12 parts of expanded perlite, 72 parts of expanded vermiculite, 10.5 parts of aluminum silicate fiber, 12 parts of mica powder, and 9.5 parts of titanium dioxide are added to a mixer and stirred for pre-mixing for 18.5 minutes; then 105 parts of water are added to the mixer and continued to stir for 30 minutes; then 0.5 parts of aluminum silicate, 3.5 parts of attapulgite powder, and 15 parts of water glass are added to the mixer and continued to stir for 9 minutes; then, the slurry in the mixer is discharged into a colloid grinder for grinding for 1.38 hours; finally, the slurry in the grinder is discharged into a vibrating screen for filtration, and the impurities mixed in during the operation are filtered out to obtain the fire retardant coating.

[0044] Example 7

[0045] 86 parts of silicate cement, 22 parts of expanded perlite, 121 parts of expanded vermiculite, 14 parts of aluminum silicate fiber, 14 parts of mica powder, and 8.5 parts of titanium dioxide are added to a mixer and stirred for pre-mixing, and the stirring time is 19.6 minutes; then 117 parts of water are added to the mixer and continued to stir, and the stirring time is 31 minutes; then 1.25 parts of aluminum silicate, 2.8 parts of attapulgite powder, and 13 parts of water glass are added to the mixer and continued to stir, and the stirring time is 6.5 minutes; then, the slurry in the mixer is discharged into a colloid grinder for grinding, and the grinding time is 1.26 hours; finally, the slurry in the grinder is discharged into a vibrating screen for filtration, and the impurities mixed in during the operation are filtered out, and the fire retardant coating is obtained.

[0046] Example 8

[0047] 78 parts of silicate cement, 21 parts of expanded perlite, 115.5 parts of expanded vermiculite, 13.5 parts of aluminum silicate fiber, 13 parts of mica powder, and 7.5 parts of titanium dioxide are added to a mixer and stirred for pre-mixing, and the stirring time is 16.8 minutes; then 120 parts of water are added to the mixer and continued to stir, and the stirring time is 29.5 minutes; then 0.5 parts of aluminum silicate, 3.7 parts of attapulgite powder, and 11.5 parts of water glass are added to the mixer and continued to stir, and the stirring time is 5.5 minutes; then, the slurry in the mixer is discharged into a colloid grinder for grinding, and the grinding time is 1.45 hours; finally, the slurry in the grinder is discharged into a vibrating screen for filtration, and the impurities mixed in during the operation are filtered out, and the fire retardant coating is obtained.

[0048] Finally, it should be noted that the above embodiments are only preferred embodiments of the present invention to illustrate the technical solutions of the present invention, rather than limiting them, and certainly not limiting the patent scope of the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention. In other words, any changes or modifications made to the main design concept and spirit of the present invention that have no substantive significance, and the technical problems they solve are still consistent with the present invention, should be included in the protection scope of the present invention. In addition, the direct or indirect application of the technical solutions of the present invention in other related technical fields is also included in the patent protection scope of the present invention.

Claims

1. A non-expanding fire retardant coating for steel structure, characterized in that: It is composed of the following components in parts by weight:

2. A non-expanding fire retardant coating for steel structure according to claim 1, characterized in that: The base material is any one or more of silicate cement, refractory cement and silica sol.

3. A non-expanding fire retardant coating for steel structure according to claim 2, characterized in that: The base material is silicate cement.

4. A non-expanding fire retardant coating for steel structure according to claim 1, characterized in that: The aggregate is any one or more of expanded perlite, expanded vermiculite, fly ash, and vitrified microspheres.

5. A non-expanding fire retardant coating for steel structure according to claim 4, characterized in that: The aggregates are expanded perlite and expanded vermiculite, and the ratio of expanded vermiculite to expanded perlite is 11-12:

2.

6. A non-expanding fire retardant coating for steel structure according to claim 1, characterized in that: The reinforcing fiber is any one or more of aluminum silicate fiber, ceramic fiber, glass fiber, rock wool, and mineral wool.

7. A non-expanding fire retardant coating for steel structure according to claim 6, characterized in that: The reinforcing fiber is aluminum silicate fiber.

8. The non-expanding fire retardant coating for steel structure according to claim 1, characterized in that: The pigment is titanium dioxide.

9. The non-expanding fire retardant coating for steel structure according to claim 1, characterized in that: The flame retardant is aluminum silicate.

10. A method for preparing a non-expanding fire retardant coating for steel structure according to any one of claims 1 to 9, characterized in that: The steps include: Step 1: weigh the raw materials in parts by weight; Step 2: Turn on the mixer, add silicate cement, expanded perlite, expanded vermiculite, aluminum silicate fiber, mica powder, and titanium dioxide into the mixer and stir and pre-mix for 15-20 minutes; Step 3: Add the prepared water into the mixer and stir for 25-35 minutes; Step 4: Add aluminum silicate, attapulgite powder and water glass into a mixer and stir for 5-10 minutes; Step 5: Discharge the slurry in the mixer into the colloid grinder for grinding, and the grinding time is 1.2-1.5h; Step 6: The slurry in the grinder is discharged into a vibrating screen for filtration, and the impurities mixed in during the operation are filtered out to obtain the fire retardant coating.

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