CN117776654A

CN117776654A - Double-density fireproof fiberboard and preparation method thereof

Info

Publication number: CN117776654A
Application number: CN202311347084.1A
Authority: CN
Inventors: 司马昕; 李恋恋; 顾海奇
Original assignee: Minye Fire Protection Technology Shandong Co ltd
Current assignee: Minye Fire Protection Technology Shandong Co ltd
Priority date: 2023-10-18
Filing date: 2023-10-18
Publication date: 2024-03-29

Abstract

The invention discloses a dual-density fire-resistant fiber board and a preparation method thereof, the dual-density fire-resistant fiber board comprises a high-density fiber board and a low-density fiber board, wherein the high-density fiber board and the low-density fiber board are formed by pressurizing the high-temperature-resistant fiber material after being immersed by fire-resistant combination liquid, the thickness of the high-density fiber board accounts for 5% -50%, the thickness of the low-density fiber board accounts for 50% -95%, the fire-resistant combination liquid is obtained by diluting fire-resistant combination liquid with water in proportion, and the fire-resistant combination liquid comprises the following raw materials: fillers, binders, dispersants and water repellents. The invention provides a double-density refractory fiber board and a preparation method thereof, wherein the high-temperature resistant fiber board is impregnated with a refractory combination liquid and then pressurized to form an integrated double-density material, and the high-density part has smooth and flat surface, can be directly used without influencing the performance.

Description

Double-density fireproof fiberboard and preparation method thereof

Technical Field

The invention relates to the field of refractory heat insulation materials, in particular to a dual-density refractory fiber board and a preparation method thereof.

Background

The prior refractory and heat-insulating materials mainly comprise microporous composite materials such as aerogel products, calcium silicate plates, aluminum silicate products, magnesium silicate products, glass fiber products, rock wool products, expanded perlite and the like. In order to meet the requirements of different fire resistances and heat insulation, multiple layers of different materials are needed to be matched for use, for example, when a smoke prevention and exhaust ventilation pipeline of a building is built, a layer of rock wool product is wrapped outside an iron sheet air pipe in order to meet the fire resistance requirement of the pipeline, and then a layer of calcium silicate plate is installed. The temperature required by the fire resistance in 2 hours usually reaches 1050 ℃, but the rock wool with conventional thickness can not meet the fire resistance, so that a layer of calcium silicate plate is additionally overlapped outside to improve the fire resistance, the rock wool has the characteristics of low density and low thermal conductivity, and the calcium silicate plate has the characteristics of high density, high thermal conductivity, strong fire resistance, high surface strength, flatness and good weather resistance, and the matching of the calcium silicate plate and the rock wool is a mature solution at present. However, the use of such a solution is limited by objective reasons such as complex construction procedures, too heavy calcium silicate boards, high costs, etc. For example, fire-proofing of bulkheads and decks of marine structures uses a blanket or felt made of silicate fibers for fire-proofing and heat-insulation, wherein silicate fiber products are deeply favored by users due to the characteristics of good high temperature resistance, light weight, low heat conductivity and the like, but at the same time, the defects of uneven surface, poor aesthetic degree and no strength on the surface are easy to break, so that the silicate fiber products suffer from a certain scaling problem.

Therefore, how to solve the above-mentioned drawbacks of the prior art is a subject to be studied and solved by the present invention.

Disclosure of Invention

The invention aims to provide a double-density fireproof fiberboard and a preparation method thereof, and aims to solve the problems of high cost, over-high density, uneven surface and low strength of the existing fireproof material.

In order to achieve the above purpose, the first technical scheme adopted by the invention is as follows:

a preparation method of a double-density refractory fiberboard comprises the following steps:

in a first step, the first step is to provide a first step,

adding 20-30 parts by mass of kaolin into 50-65 parts by mass of sodium silicate solution, fully mixing, and standing until the kaolin is uniformly dispersed, wherein the solid content of the sodium silicate solution is 30-50%;

then adding 1.5-15 parts by mass of a bi-component high-temperature-resistant adhesive mixture, 1-10 parts by mass of a silane coupling agent and 0.5-5 parts by mass of a siloxane waterproof agent, and uniformly stirring to obtain a precast refractory slurry, wherein the bi-component high-temperature-resistant adhesive mixture is a mixture of epoxy resin and a corresponding curing agent thereof;

step two, a step two of the method,

uniformly mixing the precast refractory slurry and water according to the ratio (mass) of 1:1-20 to obtain precast refractory liquid, immersing a fiber blanket or fiber felt in the precast refractory liquid, and completely immersing the fiber blanket or fiber felt in the precast refractory liquid;

step three, the step three is that,

taking out the fully infiltrated fiber blanket or fiber felt, compressing to 10-90% of the original thickness to extrude water in gaps of the fiber blanket or fiber felt, solidifying at 25-200 ℃ in an extrusion state, and naturally curing for 1-3 days after solidification to form a dual-density refractory fiber board with a low-density layer as a top layer and a high-density layer as a bottom layer, wherein the high-density layer is solid plate-shaped, and the low-density layer is fiber elastic.

Preferably, the kaolin is 800-1500 mesh.

Preferably, the time of standing in the first step is 5-15 minutes. The kaolin with higher fineness cannot be fully mixed in a single stirring step, and still static aging is required to fully mix the kaolin powder with the liquid sodium silicate. Too short a standing may cause insufficient aging, while too long a standing does not cause negative effects, it is unnecessary to perform too long a standing from the viewpoint of time cost. As will be appreciated by those skilled in the art.

Preferably, the fiber blanket or the fiber felt is cotton, blanket or felt made of high temperature resistant fibers, and the high temperature resistant fibers are one or more of high silica fibers, alumina fibers, aluminum silicate fibers, alkaline earth silicate fibers and basalt fibers.

Preferably, the volume weight of the fiber blanket or the fiber mat is 70 kg-160 kg/m ³ 。

Preferably, in the first step, 10 to 30 parts by mass of aluminum hydroxide is added to the sodium silicate solution and mixed together.

In the application, the silane coupling agent is one or a combination of more of aminopropyl triethoxysilane (KH 550), glycidoxypropyl trimethoxysilane (KH 560), methacryloxy-propyl trimethoxysilane (KH 570) and helium ethyl-aminopropyl trimethoxysilane (KH 792). Silane coupling agents are a class of substances with two functional groups of different properties, one part of the functional groups in the molecules of which can react with organic molecules, and the other part of the functional groups can react with adsorbed water on the surface of an inorganic substance to form firm adhesion. The coupling agent in the composite material can react with some groups on the surface of the reinforcing material and can react with matrix resin to form an interface layer between the reinforcing material and the resin matrix, and the interface layer can transfer stress, so that the bonding strength between the reinforcing material and the resin is enhanced, the performance of the composite material is improved, and meanwhile, the coupling agent can prevent from penetrating into the interface with other media, improves the interface state, and is beneficial to the ageing resistance, the stress resistance and the electrical insulation performance of the product. Among them, the addition of the silane coupling agent plays an important role in the formation of double density and the adhesion of the facestock.

The siloxane waterproof agent is a polymer containing Si-O-Si bonds to form a main chain structure. It is customary to call silicones or polysilicates, which may be linear, cyclic or crosslinked polymers. The adhesive temperature coefficient is small, the compression resistance is good, the surface tension is low, the hydrophobicity and the moisture resistance are good, and the specific heat conductivity is small. Widely used in personal care products such as cosmetics; the product is industrially used as defoamer, release agent, lubricant, hydrophobing agent, heat transfer oil, hydraulic oil, electric insulating liquid, honest vibration oil, north polishing agent, brightening agent, plastic lubricant, leather finishing agent, surfactant and the like. In this application, the silicone waterproofing agent is polydimethylsiloxane (PMX-200) and/or aminomethyl siloxane (DC 949).

Preferably, in the third step, after the impregnated fiber blanket or fiber mat is taken out, a surface material is placed on the top surface and/or the bottom surface of the fiber blanket or fiber mat, and then curing is performed.

Preferably, the surface material is one or two of aluminum foil, glass fiber cloth and flame-retardant polyester film. Wherein, the flame-retardant polyester film can be selected from different colors or different printing patterns to provide the product decoration applicability.

In order to achieve the above purpose, the second technical scheme adopted by the invention is as follows:

the double-density fire-resistant fiber board obtained by the preparation method.

Wherein the thickness of the high-density area of the obtained double-density refractory fiber board is 5 to 50 percent of the thickness of the double-density refractory fiber board, and the density is 220kg/m ³ ～600kg/m ³ The method comprises the steps of carrying out a first treatment on the surface of the The thickness of the low density area accounts for 50-95% of the thickness of the dual-density refractory fiber board, and the density is 100kg/m ³ ～200kg/m ³ 。

The relative thickness of the high-density layer and the low-density layer can be increased by adjusting the dilution ratio of the precast refractory composition and water, when the thickness of the high-density part needs to be increased, the addition amount of water is reduced when the refractory composition and water are diluted, so that the solid content of the refractory mixed solution is increased, more refractory composition can be absorbed in the product after dipping, and more refractory composition remains in the product after excess water is extruded, thereby increasing the thickness of the high-density layer. Conversely, if the thickness of the high-density layer is required to be reduced, the amount of dilution water can be increased, the components of the refractory composition in the product can be reduced, and the thickness of the high-density layer of the obtained product can be reduced.

When selecting fiber blanket or felt with different volume weight, the density of the high-density layer and the low-density layer can be adjusted, wherein the low-density layer is the original density of fiber material, and the high-density layer has higher density due to the improvement of fiber density and easy retention of more refractory composition components when water is extruded. In addition, the same density fibrous material and refractory composition can also be used to produce articles with higher density layers by increasing the compression ratio.

Wherein the bi-component high temperature resistant adhesive mixture is a mixture of epoxy resin and a corresponding curing agent thereof. The corresponding curing agent may also be an epoxy resin. The epoxy resin and the corresponding curing agent mixture can be a two-component epoxy resin glue, which is composed of two components, and needs to be used after being mixed.

If the surface material is not needed, the soaked fiber blanket or fiber felt is taken out and placed on a plane, and a release agent is preferably coated on the plane, so that the release after curing is facilitated.

Wherein curing in an extruded state is necessary.

The compression ratio determines the density of the high-density area after the finished product, and the compression ratio is large, so that the density of the high-density area is high; the compression ratio is small, and the density of the high-density area is correspondingly reduced; the density of the filler and fiber bonds in the refractory composition varies.

The method comprises the steps of extruding water from a fiber blanket or a fiber felt which is soaked for the first time, inverting the front side and the back side, placing the fiber blanket or the fiber felt in a precast refractory liquid again, extruding the water, and solidifying. This results in a high density layer on both sides of the fibre blanket or fibre mat, i.e. a structure of high density layer 1-low density layer-high density layer 2. Wherein the density of the high density layer 1 may be different from the density of the high density layer 2.

The curing temperature is not necessarily required, and generally, the higher the temperature is, the shorter the curing time is. And whether curing is completed is determined, which is known to those skilled in the art, and thus is not described in detail herein.

The time of natural curing is not necessarily required, and is known to those skilled in the art according to the specific situation, so it is not described herein.

Wherein "density" and "volume weight" are used in the industry to measure the mass per unit volume of a product, both of which are synonymous in this application.

The technical scheme of the invention has the design principle and advantages that:

the product adopts high temperature resistant fiber material, is immersed in prefabricated refractory liquid prepared specifically, and after solidification, an upper layer and a lower layer of integral material with different densities can be obtained, the low density part ensures better heat insulation property with lower heat conductivity, the high density part has better fire resistance and certain strength, and the damage of high heat density to the structure at high temperature is resisted. Effectively combines the characteristics of low-density refractory materials and high-density refractory materials, and improves the refractory performance.

The fiber blanket/felt is a homogeneous standard product manufactured by a needle punching method, has low density and a large amount of gaps inside the material. The prefabricated refractory liquid contains inorganic refractory filler kaolin and inorganic adhesive sodium silicate solution, after the fiber blanket absorbs the solution, the filler and the adhesive are fully distributed in the gaps inside the material, but most of the filler and the adhesive are water, the material is dehydrated by downward pressurization, at the moment, the intricate fiber material is a natural filter screen, a large amount of water is discharged, a large amount of filler and adhesive are reserved at the bottom of the material, the bottom filler and the fiber are pressed together during pressurization and dehydration, after heating and drying, the filler and the internal fiber are adhered into a whole, and the fiber can improve the strength and the tensile force of the surface layer material to form an integral double-density material. The surface of the high-density part is smooth and flat, and the high-density part can be directly used without influencing the performance. If the appearance has a certain requirement, different facing materials can be selected for lamination, such as composite aluminum foil, polyester synthetic film, inner decorative facing paper, metal materials and the like, and the extension application is improved.

The technical scheme solves the problems of high comprehensive cost, high product density, too heavy product, uneven surface of cotton felt products, low surface strength of cotton board products, low weather resistance of organic composite materials, multi-layer superposition use, complex construction and the like of the traditional fireproof fiber products.

Drawings

FIG. 1 is a schematic view of a dual density refractory fiberboard of example 1 of the present invention.

FIG. 2 is a schematic representation of a dual density refractory fiberboard obtained in example process A of example 2 of the present invention.

FIG. 3 is a schematic representation of a dual density refractory fiberboard obtained in example process D of example 2 of the present invention.

In the above figures: 1. a low density layer; 2. a high density layer; 3. a surface material.

Detailed Description

The invention is further described below with reference to the accompanying drawings and examples:

example 1

Kaolin (calcined, 1250 mesh, molecular weight 258) sodium silicate solution (3.46 kg, baume 40, 35% solids content) from Shanxi Jinkun mineral products, henan platinum cast materials, inc. epoxy resin A (E44, epoxy equivalent 210-230) Nantong starSynthetic Material Co., ltd epoxy resin B (JP-206B) Nantong star synthetic Material Co., ltd silane coupling agent (KH 560, molecular weight 236.3) Jiangsu light coupling agent, silicone waterproofing agent (PMX-200, viscosity 500) of Jiangsu light coupling agent, manchurian chemical reagent, dispersant (polycarboxylate dispersant Ecospert 5040) of Americana Corning aluminium hydroxide (analytical grade) Chemicals, shandong Fumeisi New material, inc. aluminium silicate fiber blanket (Standard, volume weight 96 kg/m) ³ 4cm thick Shandong Min's fire resistant fiber kaolin (1.73 kg) was mixed with sodium silicate solution (3.46 kg) and the resulting kaolin solution mixture was allowed to stand until the clay was dissolved (about 5-15 minutes). Epoxy A (279 g) was mixed with epoxy B (81 g) until A and B formed a polymeric epoxy mixture. A mixture of silane (300 g), siloxane (150 g) and polymeric epoxy resin was added to the kaolin solution. The resulting mixture was stirred to form a preformed refractory slurry (about 3-5 minutes).

In this embodiment, the specific parts by mass of each component may be adjusted within a specified range as required.

Composition of the composition	Parts by weight of
		Sodium silicate	50-65
Kaolin clay	20-30
		Silane coupling agent	1-10
Silicone waterproofing agent	0.5-5
		Epoxy part A	4-12
Epoxy part B	1-4

The resulting refractory composition was mixed with water in a ratio of 1:3, diluting and stirring to fully mix the liquid to obtain the precast refractory mixed liquid.

The method comprises the steps of immersing an aluminum silicate fiber blanket in a fire-resistant mixed solution, taking out the aluminum silicate fiber blanket after the solution is saturated and absorbed, pressurizing the aluminum silicate fiber blanket up and down to a thickness of 2.5cm, extruding out excessive water, placing the aluminum silicate fiber blanket on a metal template, and carrying out spray coating of a release agent on the contact surface of the metal template and an aluminum silicate fiber product and drying the contact surface, so that the contact surface is separated from the metal template after drying the product, or paving a layer of film material precoated with the release agent between the aluminum silicate fiber product and the metal template, thereby facilitating the demoulding and production of the product. Placing the fiber board in a press, curing the fiber board at 70 ℃ for 120 minutes, taking out the fiber board for natural curing for 48 hours, and demoulding the fiber board to obtain the dual-density fire-resistant fiber board. The high-density surface is smooth and flat without a facing, so that secondary coating or re-construction is convenient during subsequent secondary construction.

Example 2

Example procedure A

The resulting refractory composition was mixed with water in a ratio of 1:3, diluting and stirring to fully mix the liquid to obtain the precast refractory mixed solution.

Soaking an aluminum silicate fiber blanket in a fire-resistant mixed solution, taking out the aluminum silicate fiber blanket after the solution is saturated and absorbed, pressurizing the aluminum silicate fiber blanket up and down to a thickness of 2.5cm, extruding excessive water, placing the aluminum silicate fiber blanket on an aluminum foil, placing the aluminum silicate fiber blanket in a press, curing the aluminum silicate fiber blanket at 70 ℃ for 120 minutes, taking out and naturally curing the aluminum silicate fiber blanket for 48 hours, and thus obtaining the double-density fire-resistant fiber board.

Example procedure B

The resulting refractory composition was mixed with water in a ratio of 1:15 diluting and stirring to fully mix the liquid to obtain the precast refractory mixed solution.

Soaking an aluminum silicate fiber blanket in a fire-resistant mixed solution, taking out the aluminum silicate fiber blanket after the solution is saturated and absorbed, pressurizing the aluminum silicate fiber blanket up and down to a thickness of 1cm, extruding excessive water, placing the aluminum silicate fiber blanket on glass fiber cloth, placing the glass fiber cloth in a press, curing for 120 minutes at 70 ℃, taking out and naturally curing for 48 hours, thus obtaining the double-density fire-resistant fiber board. The glass fiber cloth increases the structural strength of the surface plate.

Example procedure C

The resulting refractory composition was mixed with water in a ratio of 1:10, diluting and stirring to fully mix the liquid to obtain the precast refractory mixed solution.

Soaking an aluminum silicate fiber blanket in a fire-resistant mixed solution, taking out the aluminum silicate fiber blanket after the solution is saturated and absorbed, pressurizing the aluminum silicate fiber blanket up and down to a thickness of 2cm, extruding excessive water, placing the aluminum silicate fiber blanket on a flame-retardant polyester film, placing the flame-retardant polyester film in a press, curing the flame-retardant polyester film at 70 ℃ for 120 minutes, taking out and naturally curing the flame-retardant polyester film for 48 hours, and thus obtaining the double-density fire-resistant fiber board. The flame-retardant polyester film can be selected from different colors or different printed patterns to provide product decoration applicability.

Example procedure D

The resulting refractory composition was mixed with water in a ratio of 1: and 5, diluting and stirring to fully mix the liquid to obtain the precast refractory mixed solution.

And (3) immersing the aluminum silicate fiber blanket in a fire-resistant mixed solution, taking out the aluminum silicate fiber blanket after the solution is saturated, pressurizing the aluminum silicate fiber blanket up and down to a thickness of 2.5cm, and extruding out excessive water. Reversing the aluminum silicate fiber blanket by 180 degrees, immersing again in a fire-resistant mixed solution, taking out the aluminum silicate fiber blanket after saturated absorption, pressurizing up and down to a thickness of 2.5cm, placing the aluminum silicate fiber blanket on an aluminum foil, placing an aluminum foil layer on a surface layer, placing the aluminum foil layer in a press, curing for 120 minutes at 70 ℃, taking out and naturally curing for 48 hours, thus obtaining the double-density fire-resistant fiber board, namely, a top layer and a bottom layer high-density platy, wherein the middle part is a bottom density fibrous material.

Example procedure E

The resulting refractory composition was mixed with water in a ratio of 1:20, diluting and stirring to fully mix the liquid to obtain the precast refractory mixed solution.

And (3) immersing the aluminum silicate fiber blanket in a fire-resistant mixed solution, taking out the aluminum silicate fiber blanket after the solution is saturated, pressurizing the aluminum silicate fiber blanket up and down to a thickness of 2.5cm, and extruding out excessive water. Reversing the aluminum silicate fiber blanket by 180 degrees, immersing again in a fire-resistant mixed solution, taking out the aluminum silicate fiber blanket after saturated absorption, pressurizing up and down to a thickness of 2.5cm, placing the aluminum silicate fiber blanket on glass fiber cloth, placing a layer of glass fiber cloth on a surface layer, placing the glass fiber cloth in a press, curing at 70 ℃ for 120 minutes, taking out and naturally curing for 48 hours, and obtaining the dual-density fire-resistant fiber board, namely a top layer and a bottom layer high-density platy, wherein the middle part is a bottom density fibrous material. The glass fiber cloth increases the structural strength of the surface plate.

Example procedure F

And (3) immersing the aluminum silicate fiber blanket in a fire-resistant mixed solution, taking out the aluminum silicate fiber blanket after the solution is saturated, pressurizing the aluminum silicate fiber blanket up and down to a thickness of 2.5cm, and extruding out excessive water. Reversing the aluminum silicate fiber blanket by 180 degrees, immersing again in a fire-resistant mixed solution, taking out the aluminum silicate fiber blanket after saturated absorption, pressurizing up and down to a thickness of 2.5cm, placing the aluminum silicate fiber blanket on a flame-retardant polyester film, placing a layer of flame-retardant polyester film on a surface layer, placing the surface layer in a press, curing for 120 minutes at 70 ℃, taking out and naturally curing for 48 hours, and obtaining the dual-density fire-resistant fiber board, wherein the top layer and the bottom layer are high-density platy, and the middle part is made of a bottom-density fibrous material. The flame-retardant polyester film can be selected from different colors or different printed patterns to provide product decoration applicability.

The dual-density refractory fiber board produced according to example A process of example 2 had a board thickness of 2.5cm and an areal density of 312kg/M ³ The dual-density refractory fiber produced by example D had a thickness of 2.5cm and an areal density of 410kg/m ³ 。

Performance comparison graph

Product(s)	Hydrophobic property	Thermal conduction	Strength of	Fire resistant	Appearance of appearance
						Aluminium silicate fibre blanket	Not hydrophobic	500℃，0.17W/(m·k)	/	Crystallization shrinkage at 1200 DEG C	Homogeneous loose fiber
Example A	99％	500℃，0.16W(m·k)	1.5MPa	1200 ℃ and complete surface carbonization structure (plate surface)	Surface leveling and smoothing (plate surface)
						Example D	99％	500℃，0.18W/(m·k)	3.5MPa	1200 ℃ and complete surface carbonization structure (plate surface)	Surface leveling and smoothing (plate surface)

EXAMPLE 3 addition of aluminium hydroxide to precast refractory size

Numbering device	Description of the invention
		1	Weighing sodium silicate solution
2	Adding metakaolin and aluminium hydroxide into sodium silicate solution
		3	Introducing the mixture into a digital LC-OES-120 blender
4	The stirrer rotation speed was increased to 1500rpm
		5	For 10 minutes until the kaolin and aluminum hydroxide are completely mixed into the sodium silicate solution
6	Aging the solution for 60 minutes
		7	Adding silane coupling agent
8	Adding siloxanes
		9	The epoxy resin A part and the epoxy resin B part react and then are added
10	The additive portion was mixed in a beaker and the mixture was introduced into a stirrer
		11	The stirring speed is increased by 1500rpm, and stirring is continued for 10 minutes
12	Adding a dispersant
		13	Adding 3 times mass of water, stirring at 1500rpm for 10 min until mixing thoroughly
14	Is taken out from the stirrer and can be used

The developed fire resistant compositions were tested for adhesion, with the total amount of epoxy resin increasing from 3% to 5% and then not significantly different between 6% and 8%. The lower epoxy resin load can save cost, has certain strength on the bonding effect of the organic facing material, and shows better fireproof performance. The combination properties of the incorporation of different waterproofing agents, silane coupling agents, dispersants were also analyzed while optimizing the adhesion.

Therefore, in the technical scheme, the epoxy resin accounts for 3-8% of the total mass of the precast refractory mortar.

Through test analysis and comparison, the usage amount of the aluminum hydroxide refractory material is increased, the physical and chemical properties are stable at normal temperature, the oxide refractory performance is better, the nanometer aluminum hydroxide not only can increase the limited oxygen index of the flame-retardant polymer and increase the flame-retardant performance, but also is beneficial to improving the surface smoothness, the mechanical and electrical properties of the polymer product and enhancing the anti-leakage, anti-arc and anti-abrasion capabilities of the polymer product. When the ambient temperature is increased to 200-350 ℃, dehydration and heat absorption are carried out, and the temperature rise of the polymer is inhibited; the concentration of the combustible polymer is reduced. The concentration of the combustible gas and the oxygen can be diluted by the water vapor discharged from dehydration, so that combustion can be prevented; in addition, an Al2O3 protective film is generated on the surface of the combustible material after dehydration, so that oxygen is isolated, and continuous combustion can be prevented;

product(s)	Hydrophobic property	Thermal conduction	Strength of	Fire resistant	Appearance of appearance
						Aluminium silicate fibre blanket	Not hydrophobic	500℃，0.17W(m·k)	/	Crystallization shrinkage at 1200 DEG C	Homogeneous loose fiber
Example A	99％	500℃，0.14W(m·k)	2.5MPa	1200 ℃ and complete surface carbonization structure (plate surface)	Surface leveling and smoothing (plate surface)
						Example D	99％	500℃，0.15W(m·k)	4.5MPa	1200 ℃ and complete surface carbonization structure (plate surface)	Surface leveling and smoothing (plate surface)

Example A article of double Density fire resistant cellucotton Board

The following are fire resistance tests

The test piece is two groups of 6M long metal steel plate air pipes wrapped with platy fireproof cotton, the diameter of an orifice A is 1000 x 500mm, the diameter of an orifice B is 1000 x 250mm, the thickness of the metal steel plate is 1mm, the splicing parts of the air pipes are connected by adopting angle steel flanges, and the thickness of a double-density fireproof fiber plate is 4cm (the thickness of a high-density part is 1cm and the thickness of a low-density part is 4 cm). The test method is according to GB/T17428-2009 fire resistance test method for ventilating duct, and the test needs to meet the integrity and heat insulation simultaneously.

10.2.2 integrity test pieces are capable of sustaining the time to fire resistant performance during the fire resistance test. The test piece is considered to lose integrity if any of the following limitations occur:

A. the test was performed according to 8.4.1, the cotton pad was ignited;

B. according to the requirements of 8.4.2, the slit probe can pass through;

C. the backfire face has a flame and a duration exceeding 10s.

10.2.3 heat insulating test piece was held for a period of time during which the wire maintains the heat insulating properties. The test piece was considered to lose heat insulating properties when the temperature rise of the backfire surface of the test piece exceeded the following limit.

a) The average temperature rise exceeds the initial average temperature of 140 ℃;

b) The temperature rise at any point exceeds the initial temperature (including moving the thermocouple) by 180 ° (the initial temperature should be the initial average temperature of the backfire at the beginning of the test)

Fire resistance test time 120 minutes

Pipeline A:

integrity of the unlit cotton pad; no cracks appear; no flame appears; the pressure difference in the pipe was 189Pa. It was judged that integrity was not lost.

The average temperature rise of the back surface of the heat-insulating pipeline is less than 140 ℃; the highest single-point temperature rise is less than 180 ℃; integrity is not lost. It was determined that the heat insulating property was not lost.

Pipeline B:

integrity of the unlit cotton pad; no cracks appear; no flame is present. It was judged that integrity was not lost.

The test result is detected by a 1200min fire resistance test by coating the surface of a metal air pipe with a 4cm thick double-density fire resistant fiber plate. According to the test process, the temperature in the furnace is raised from 0 ℃ to 1050 ℃ in the test process of 0-120 min, the average temperature of the back surface of the test piece A tube is raised from 0 ℃ to 118 ℃, and the average temperature of the back surface of the test piece B tube is raised from 0 ℃ to 132 ℃. In the comprehensive view, the temperature of the temperature measuring point of the backfire surface of the test piece in the time period rises slowly, and the double-density fireproof fiber board has good high-temperature heat insulation property. According to the requirements of the non-inflammable fire-resistant limit time of the building, the double-density fire-resistant fiber board with different thickness is selected, so that the requirements of different fire-resistant limits can be met, the fire-resistant limit performance can reach more than 180min, and the requirements of different fire-resistant applications can be met.

The above embodiments are provided to illustrate the technical concept and features of the present invention and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the spirit of the present invention should be construed to be included in the scope of the present invention.

Claims

1. A preparation method of a double-density refractory fiber board is characterized in that: the method comprises the following steps:

in a first step, the first step is to provide a first step,

step two, a step two of the method,

uniformly mixing the precast refractory slurry and water according to the proportion of 1:1-20 to obtain precast refractory liquid, immersing a fiber blanket or fiber felt in the precast refractory liquid, and completely immersing the fiber blanket or fiber felt in the precast refractory liquid;

step three, the step three is that,

2. The method of manufacturing according to claim 1, characterized in that: the fiber blanket or the fiber felt is cotton, blanket or felt made of high temperature resistant fibers, and the high temperature resistant fibers are one or more of high silica fibers, alumina fibers, aluminum silicate fibers, alkaline earth silicate fibers and basalt fibers.

3. The preparation method according to claim 1, characterized in that: the volume weight of the fiber blanket or the fiber felt is 70 kg-160 kg/m ³ 。

4. The method of manufacturing according to claim 1, characterized in that: in the first step, 10 to 30 parts by mass of aluminum hydroxide is added into the sodium silicate solution and mixed together.

5. The method of manufacturing according to claim 1, characterized in that: the silane coupling agent is one or a combination of more of aminopropyl triethoxysilane, glycidol ether oxygen propyl trimethoxysilane, methacryloxy-propyl trimethoxysilane and helium ethyl-aminopropyl trimethoxysilane.

6. The method of manufacturing according to claim 1, characterized in that: the siloxane waterproof agent is polydimethylsiloxane and/or aminomethyl siloxane.

7. The method of manufacturing according to claim 1, characterized in that: and in the third step, after the soaked fiber blanket or fiber felt is taken out, placing a surface material on the top surface and/or the bottom surface of the fiber blanket or fiber felt, and then curing.

8. The method of manufacturing according to claim 7, wherein: the surface material is one or two of aluminum foil, glass fiber cloth and flame-retardant polyester film.

9. A dual density fire resistant fiberboard obtainable by the method of any one of claims 1 to 8.