CN110511531B - Phenolic foam composite board and preparation method thereof - Google Patents

Phenolic foam composite board and preparation method thereof Download PDF

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Publication number
CN110511531B
CN110511531B CN201910880273.2A CN201910880273A CN110511531B CN 110511531 B CN110511531 B CN 110511531B CN 201910880273 A CN201910880273 A CN 201910880273A CN 110511531 B CN110511531 B CN 110511531B
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phenolic foam
composite board
waste
glass fiber
medium
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CN110511531A (en
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杨准
杨峰
陈晨
王春
刘俊泽
鞠鹏达
董雅君
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Yingkou Xiangyuan New Materials Engineering Technology Co ltd
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Yingkou Xiangyuan New Materials Engineering Technology Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L61/00—Compositions of condensation polymers of aldehydes or ketones; Compositions of derivatives of such polymers
    • C08L61/04—Condensation polymers of aldehydes or ketones with phenols only
    • C08L61/06—Condensation polymers of aldehydes or ketones with phenols only of aldehydes with phenols
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/16—Halogen-containing compounds
    • C08K2003/166—Magnesium halide, e.g. magnesium chloride
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2217—Oxides; Hydroxides of metals of magnesium
    • C08K2003/222—Magnesia, i.e. magnesium oxide
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
    • C08L2205/16—Fibres; Fibrils
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2207/00—Properties characterising the ingredient of the composition
    • C08L2207/20—Recycled plastic

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Laminated Bodies (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)

Abstract

The invention provides a phenolic foam composite board and a preparation method thereof, belonging to the technical field of composite boards. The phenolic foam composite board provided by the invention comprises a first unsaturated resin layer, a first medium-alkali glass fiber net layer, a phenolic foam core layer, a second medium-alkali glass fiber net layer and a second unsaturated resin layer which are sequentially stacked; the preparation raw materials of the phenolic foam core layer comprise: waste phenolic foam, a framework material, fibers, a high-molecular anti-cracking material, a binder and water. The phenolic foam composite board provided by the invention takes waste phenolic foam as a main material, and is matched with a framework material, fibers, a high-molecular anti-cracking material, a binder and water, so that the durability, the safety stability and the fire resistance of a phenolic foam core layer are improved; the medium-alkaline glass fiber net layer and the unsaturated resin layer are used as protective layers, so that the mechanical property, the integrity, the weather resistance and the density of the phenolic foam composite board are further enhanced.

Description

Phenolic foam composite board and preparation method thereof
Technical Field
The invention relates to the technical field of composite boards, in particular to a phenolic foam composite board and a preparation method thereof.
Background
The phenolic foam has the characteristics of flame retardancy, low smoke and high temperature resistant bifurcation, and is widely applied to the fields of aerospace, national defense and military industry, places with strict fire protection requirements such as civil airplanes, ships, stations, oil wells and the like, and building materials of high-rise buildings, hospitals and sports facilities and the like. However, the widespread use of phenolic foam also produces a significant amount of waste phenolic foam.
The existing waste phenolic foam board is mainly applied to the aspects of sandwich boards, carbonized powder additives and resin backfill materials. When the waste phenolic foam is used as a sandwich board core material, the waste phenolic foam boards need to be cut regularly and then assembled to generate a large amount of residual materials, so that the waste phenolic foam is discarded secondarily and cannot be fully utilized; when the waste phenolic aldehyde foam is used as a carbonized powder additive, the waste phenolic aldehyde plate needs to be completely smashed into powder, and the powder is activated into an additive component through the working procedures of high-temperature carbonization, washing, filtering, drying and the like, however, the quality of the product is reduced due to the excessive addition of the waste phenolic aldehyde foam, so that the consumption of the waste phenolic aldehyde foam is less in order to ensure the quality of the product; when the waste phenolic foam is used as a resin backfill material, the waste phenolic foam needs to be completely smashed into powder and added into the resin to be foamed, however, in order to ensure the cell structure and the internal uniformity of a finished plate, the addition amount is very limited, and the utilization rate is not high.
Disclosure of Invention
The invention aims to provide a phenolic foam composite board and a preparation method thereof.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a phenolic foam composite board, which comprises a first unsaturated resin layer, a first medium-alkali glass fiber net layer, a phenolic foam core layer, a second medium-alkali glass fiber net layer and a second unsaturated resin layer which are sequentially stacked;
the preparation raw materials of the phenolic foam core layer comprise: waste phenolic foam, a surfactant, a framework material, fibers, a high-molecular anti-cracking material, a binder and water.
Preferably, in the raw materials for preparing the phenolic foam core layer, the mass ratio of the waste phenolic foam, the framework material, the fiber, the high polymer anti-cracking material, the binder and the water is (25-55): (9-14): (0.5-2): (3.5-6): (3-5): (10-20).
Preferably, the waste phenolic foam is pretreated before use; the pretreatment method comprises the steps of crushing waste phenolic foam, mixing the crushed waste phenolic foam with a surfactant, washing with water until the pH value of the obtained washing liquid is 6-7, and then filtering and drying.
Preferably, the framework material comprises magnesium oxide and magnesium chloride; the mass ratio of the magnesium oxide to the magnesium chloride is (3-4): (2-3);
the fibers comprise plant fibers and/or glass fibers;
the high-molecular anti-cracking material comprises ethylene-vinyl acetate copolymer;
the binder comprises styrene-acrylic emulsion.
Preferably, the thickness of the phenolic foam core layer is 5-20 mm.
Preferably, the unsaturated resin in the first and second unsaturated resin layers includes 191#And (3) resin.
Preferably, the thicknesses of the first and second medium-alkali glass fiber mesh layers are independently 20-150 mm;
the thicknesses of the first unsaturated resin layer and the second unsaturated resin layer are independently 0.5-1 mm.
Preferably, the density of the phenolic foam composite board is 90-140 kg/m3。
The invention provides a preparation method of the phenolic foam composite board in the technical scheme, which comprises the following steps:
mixing waste phenolic foam, a framework material, fibers, a high-molecular anti-cracking material, a binder and water to obtain a phenolic foam core raw material solution;
sequentially placing the medium-alkaline glass fiber net, the phenolic foam core raw material liquid and the medium-alkaline glass fiber net in a mold, performing cold press molding, and demolding to obtain a semi-finished plate;
and spraying unsaturated resin on the upper surface and the lower surface of the semi-finished plate to obtain the phenolic foam composite plate.
Preferably, the cold press molding temperature is 5-40 ℃, the time is 45-50 h, and the pressure is 150-250 MPa.
The invention provides a phenolic foam composite board, which comprises a first unsaturated resin layer, a first medium-alkali glass fiber net layer, a phenolic foam core layer, a second medium-alkali glass fiber net layer and a second unsaturated resin layer which are sequentially stacked; the preparation raw materials of the phenolic foam core layer comprise: waste phenolic foam, a framework material, fibers, a high-molecular anti-cracking material, a binder and water. The phenolic foam composite board provided by the invention takes the waste phenolic foam as a main material, so that the utilization rate of the waste phenolic foam is obviously improved; the waste phenolic foam is matched with a framework material, fibers, a high-molecular anti-cracking material, a binder and water, so that the obtained phenolic foam core layer has good durability, safety stability and fire resistance; the medium-alkaline glass fiber net layer and the unsaturated resin layer are used as protective layers, so that the mechanical property, the integrity, the weather resistance and the density of the phenolic foam composite board are further enhanced.
The preparation method provided by the invention does not need trimming and cutting of the waste phenolic foam, does not generate secondary discarding of the waste phenolic foam, has high utilization rate of the waste phenolic foam, is simple to operate, and is suitable for large-scale production.
Drawings
FIG. 1 is a schematic view of a process for preparing a phenolic foam core feedstock;
FIG. 2 is a schematic view of a process for preparing a phenolic foam composite board.
Detailed Description
The invention provides a phenolic foam composite board, which comprises a first unsaturated resin layer, a first medium-alkali glass fiber net layer, a phenolic foam core layer, a second medium-alkali glass fiber net layer and a second unsaturated resin layer which are sequentially stacked;
the preparation raw materials of the phenolic foam core layer comprise: waste phenolic foam, a framework material, fibers, a high-molecular anti-cracking material, a binder and water.
In the invention, the waste phenolic foam is preferably pretreated before use, and the pretreatment mode is preferably that the waste phenolic foam is crushed and then mixed with a surfactant, washed by water until the pH value of the obtained washing liquid is 6-7, and then filtered and dried.
The crushing is not particularly limited, and the waste phenolic foam can be ensured to be flocculent.
In the present invention, the surfactant is preferably methyl silicone oil. In the invention, the using amount ratio of the waste phenolic foam to the surfactant is preferably (10-15): (3-5), the mass of the water used for washing is preferably 4.5-8 times that of the waste phenolic foam. In the invention, the water washing is preferably carried out under the condition of stirring, and the stirring time is preferably 25-35 min; the stirring speed in the present invention is not particularly limited, and a stirring speed well known in the art may be used. In the present invention, it is preferable that the obtained washing liquid is allowed to stand before the pH value of the washing liquid is detected; the standing time is preferably 45-60 min. The washing frequency is not particularly limited, and the pH value of the washing liquid obtained after washing can be ensured to be 6-7. In the invention, the surfactant is beneficial to fully soaking the waste phenolic foam, so that acid in the waste phenolic foam can be removed, the compatibility of the obtained pretreated waste phenolic foam and other raw materials can be enhanced, and the durability, safety stability and fire resistance of the phenolic foam core layer can be further improved.
The filtration is not particularly limited in the present invention, and a filtration operation well known in the art may be employed. In the invention, the drying temperature is preferably 45-55 ℃; the drying time is not specially limited, and the moisture content of the solid material can be ensured to be less than 20 wt%.
In the present invention, the framework material preferably includes magnesium oxide and magnesium chloride; the mass ratio of the magnesium oxide to the magnesium chloride is preferably (3-4): (2-3). According to the invention, the framework material is added into the waste phenolic foam, and the strength of the phenolic foam core layer can be improved under the combined action of other raw materials.
In the present invention, the fibers preferably include plant fibers and/or glass fibers, more preferably plant fibers or glass fibers; the length and fineness of the fiber are not particularly limited in the present invention, and those well known in the art may be used. According to the invention, the fiber is added into the waste phenolic foam, and the strength of the phenolic foam core layer can be improved under the combined action of other raw materials.
In the invention, the high-molecular anti-cracking material is preferably ethylene-vinyl acetate copolymer; the mass fraction of the vinyl acetate in the ethylene-vinyl acetate copolymer is preferably 5-15%. According to the invention, the high-molecular anti-cracking material is added into the waste phenolic foam, so that the strength of the phenolic foam core layer can be improved under the combined action of other raw materials.
In the present invention, the binder preferably includes a styrene-acrylic emulsion (i.e., styrene-acrylate emulsion); the solid content of the styrene-acrylic emulsion is preferably 5-10%. In the invention, the styrene-acrylic emulsion has good adhesive force, good water resistance, oil resistance, heat resistance and aging resistance, and can improve the strength, weather resistance and aging resistance of the phenolic foam core layer when being used together with other raw materials.
In the invention, in the raw materials for preparing the phenolic foam core layer, the mass ratio of the waste phenolic foam, the framework material, the fiber, the high polymer anti-cracking material, the binder and the water is preferably (25-55): (9-14): (0.5-2): (3.5-6): (3-5): (10-20), more preferably (30-50): (9.5-13.3): (0.9-1.8): (3.8-5.7): (2.5-5): (12-20), most preferably (35-50): (10-13): (1-1.5): (4-5): (3-4.5): (15-20). The phenolic foam composite board provided by the invention takes the waste phenolic foam as a main material, so that the utilization rate of the waste phenolic foam is obviously improved; the waste phenolic foam is matched with a framework material, fibers, a high-molecular anti-cracking material, a binder and water, so that the durability, the safety stability and the fire resistance of the phenolic foam core layer are improved.
In the invention, the thickness of the phenolic foam core layer is preferably 5-20 mm, more preferably 8-20 mm, and most preferably 10-15 mm.
In the present invention, the thickness of the first and second medium alkali glass fiber mesh layers is independently preferably 20 to 150mm, more preferably 30 to 120mm, and most preferably 50 to 100 mm. The medium-alkali glass fiber net is not specially limited, and the medium-alkali glass fiber net can be sold in the market; the medium-alkaline glassThe size of the fiber web is preferably 5mm multiplied by 5mm, and the surface density of the medium-alkali glass fiber web is preferably 125g/m2. The medium-alkaline glass fiber net adopted by the invention has good chemical stability, strong cohesiveness with resin and good dimensional stability; the medium-alkaline glass fiber net layer is used as a protective layer, so that the mechanical property, the integrity, the weather resistance and the density of the phenolic foam composite board are further enhanced.
In the present invention, the unsaturated resin in the first and second unsaturated resin layers preferably includes 191#And (3) resin. In the present invention, the thicknesses of the first unsaturated resin layer and the second unsaturated resin layer are independently preferably 0.5 to 1mm, more preferably 0.6 to 0.9mm, and most preferably 0.7 to 0.8 mm. The phenolic foam composite board provided by the invention has the protection and leveling effects by using the unsaturated resin layer, and the mechanical property, the integrity, the weather resistance and the density of the phenolic foam composite board can be further improved.
In the invention, the density of the phenolic foam composite board is preferably 90-140 kg/m3More preferably 120 to 140kg/m3。
In the present invention, all the raw material components are commercially available products well known to those skilled in the art unless otherwise specified.
The invention provides a preparation method of the phenolic foam composite board in the technical scheme, which comprises the following steps:
mixing waste phenolic foam, a framework material, fibers, a high-molecular anti-cracking material, a binder and water to obtain a phenolic foam core raw material solution;
sequentially placing the medium-alkaline glass fiber net, the phenolic foam core raw material liquid and the medium-alkaline glass fiber net in a mold, performing cold press molding, and demolding to obtain a semi-finished plate;
and spraying unsaturated resin on the upper surface and the lower surface of the semi-finished plate to obtain the phenolic foam composite plate.
The invention mixes the waste phenolic foam, the framework material, the fiber, the high polymer anti-cracking material, the binder and the water to obtain the phenolic foam core raw material liquid.
In the invention, the waste phenolic foam, the framework material, the fiber, the high polymer anti-cracking material, the binder and the water are preferably mixed in the sequence of firstly mixing the framework material, the fiber, the high polymer anti-cracking material and part of the water to obtain slurry; and secondly, mixing the waste phenolic foam, the slurry, the binder and the residual water to obtain phenolic foam core raw material liquid, wherein the process flow diagram is shown in figure 1.
In the present invention, the waste phenolic foam is preferably pre-treated prior to use. In the present invention, the pretreatment is preferably the same as the pretreatment of the waste phenolic foam in the above technical scheme, and is not described herein again.
In the present invention, the mass ratio of the partial water to the remaining water is preferably 1: (0.5 to 2), and more preferably 1: 1. In the present invention, the first mixing and the second mixing are preferably performed by stirring, and the stirring speed in the present invention is not particularly limited, and may be a stirring speed known in the art. In the present invention, the time for the first mixing and the second mixing is independently preferably 45 to 60 min.
After the phenolic foam core raw material liquid is obtained, the medium-alkaline glass fiber net, the phenolic foam core raw material liquid and the medium-alkaline glass fiber net are sequentially placed in a die, and are demoulded after cold press molding, so that a semi-finished product of the plate is obtained.
The type of the mold is not particularly limited in the present invention, and a mold known in the art may be used. The size of the mold is not particularly limited in the present invention, and is preferably determined as needed.
In the present invention, the release agent is preferably a water glass gelling material. In the present invention, before the spreading of the medium alkali glass fiber net, preferably, a release agent is coated on the inner cavity of the mold and dried. In the present invention, the release agent is preferably a water glass gelling material. In the invention, the drying temperature is preferably 25-35 ℃, the drying time is preferably 1-2 h, and the release agent is solidified in the drying process.
In the invention, the cold press molding temperature is preferably 5-40 ℃, and in the embodiment of the invention, the cold press molding temperature is preferably room temperature; the cold press molding time is preferably 45-50 h, and more preferably 48 h; the pressure of the cold press molding is preferably 150-250 MPa, and more preferably 200-250 MPa.
In the present invention, the release agent applied in the mold facilitates subsequent demolding.
After the demolding is finished, the invention preferably further comprises trimming and shaping the obtained semi-finished product. The trimming and shaping method of the present invention is not particularly limited, and a trimming and shaping method known in the art may be used.
After the semi-finished product of the plate is obtained, the upper surface and the lower surface of the semi-finished product of the plate are sprayed with unsaturated resin to obtain the phenolic foam composite plate.
The spraying method of the present invention is not particularly limited, and a spraying method known in the art may be used. The surface of the semi-finished plate is sprayed with the unsaturated resin, so that the sealing and leveling effects are achieved, and the surface impact resistance, the water resistance and the weather resistance of the phenolic foam composite plate can be improved.
The preparation method of the phenolic foam composite board provided by the invention does not need trimming and cutting of the waste phenolic foam, does not generate secondary discarding of the waste phenolic foam, has high utilization rate of the waste phenolic foam, is simple to operate, and is suitable for large-scale production.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
(1) Preparing phenolic foam core raw material liquid according to the process flow chart shown in figure 1
Crushing the waste phenolic foam board into floccules by adopting a crusher, stirring and mixing the flocculent waste phenolic foam, a surfactant and water according to a mass ratio of 10:3:70 for 30min, standing for 50min, detecting the pH value of the system, repeating the stirring, mixing and standing operations until the pH value of a washing liquid is 6.5, filtering the obtained system, and drying at 50 ℃ until the water content of the material is less than 20% to obtain the pretreated waste phenolic foam;
putting magnesium oxide, magnesium chloride, high molecular polymer, plant fiber and water in a stirrer according to the mass ratio of 4:2.5:2:5:5, and stirring and mixing for 55min to obtain slurry;
stirring and mixing the pretreated waste phenolic foam, the slurry, the styrene-acrylic emulsion and the water for 50min according to the mass ratio of 50:30:3:5 to obtain a phenolic foam core raw material liquid;
(2) the phenolic foam composite board is prepared according to the process flow chart shown in figure 2
Smearing a sodium silicate gel material in an inner cavity of a mould, paving a medium-alkaline glass fiber net after the sodium silicate gel material is solidified at room temperature, pouring a phenolic foam core raw material liquid, paving the medium-alkaline glass fiber net on the surface of the prepared raw material liquid, performing cold press molding for 48 hours at room temperature under the condition of 180MPa, and then demolding to obtain a semi-finished product of the plate;
spraying 191 the surface of the semi-finished plate#And (5) covering and leveling the resin to obtain the phenolic foam composite board.
Example 2
(1) Preparing phenolic foam core raw material liquid according to the process flow chart shown in figure 1
Crushing the waste phenolic foam board into floccules by adopting a crusher, stirring and mixing the flocculent waste phenolic foam, a surfactant and water according to a mass ratio of 10:3:70 for 25min, standing for 50min, detecting the pH value of a system, repeating the stirring, mixing and standing operations until the pH value of a washing liquid is 6.5, filtering the obtained system, and drying at 50 ℃ until the water content of the material is less than 20% to obtain pretreated waste phenolic foam;
putting magnesium oxide, magnesium chloride, high molecular polymer, plant fiber and water in a stirrer according to the mass ratio of 3:2:2.5:8:3, and stirring and mixing for 45min to obtain slurry;
stirring and mixing the pretreated waste phenolic foam, the slurry, the styrene-acrylic emulsion and the water for 50min according to the mass ratio of 55:20:5:8 to obtain a phenolic foam core raw material liquid;
(2) the phenolic foam composite board is prepared according to the process flow chart shown in figure 2
Smearing a sodium silicate gel material in an inner cavity of a mould, paving a medium-alkaline glass fiber net after the sodium silicate gel material is solidified at room temperature, pouring a phenolic foam core raw material liquid, paving the medium-alkaline glass fiber net on the surface of the prepared raw material liquid, performing cold press molding for 48 hours at room temperature under the condition of 200MPa, and then demolding to obtain a semi-finished product of the plate;
spraying 191 the surface of the semi-finished plate#And (5) sealing and leveling the resin to obtain the phenolic foam composite board.
Example 3
(1) Preparing phenolic foam core raw material liquid according to the process flow chart shown in figure 1
Phenolic foam pretreatment: crushing the waste phenolic foam board into floccules by adopting a crusher, stirring and mixing the flocculent waste phenolic foam, a surfactant and water according to the mass ratio of 12:4.5:78 for 30min, standing for 50min, detecting the pH value of a system, repeating the stirring, mixing and standing operations until the pH value of a washing liquid is 6.5, filtering the obtained system, and drying at 50 ℃ until the water content of the material is less than 20% to obtain pretreated waste phenolic foam;
putting magnesium oxide, magnesium chloride, high molecular polymer, plant fiber and water in a stirrer according to the mass ratio of 3.5:3:3:6:4, and stirring and mixing for 55min to obtain slurry;
stirring and mixing the pretreated waste phenolic foam, the slurry, the styrene-acrylic emulsion and the water for 50min according to the mass ratio of 60:25:4:10 to obtain a phenolic foam core raw material liquid;
(2) the phenolic foam composite board is prepared according to the process flow chart shown in figure 2
Smearing a sodium silicate gel material in an inner cavity of a mould, paving a medium-alkaline glass fiber net after the sodium silicate gel material is solidified at room temperature, pouring a phenolic foam core raw material liquid, paving the medium-alkaline glass fiber net on the surface of the prepared raw material liquid, performing cold press molding for 48 hours at room temperature under the condition of 250MPa, and then demolding to obtain a semi-finished product of the plate;
spraying 191 the surface of the semi-finished plate#And (5) covering and leveling the resin to obtain the phenolic foam composite board.
Comparative example 1
A phenolic foam composite board was prepared according to the method of example 1, except that no surfactant was added to the board as in example 1.
Comparative example 2
A phenolic foam composite board was prepared according to the method of example 1, except that no medium alkali glass fiber web was added to the board in example 1.
Comparative example 3
A phenolic foam composite board was prepared in accordance with the method of example 1, except that no spray coating 191 was used#And (3) resin.
Test example
The performance of the phenolic foam composite boards prepared in examples 1 to 3 and comparative examples 1 to 3 was tested, and the test results are shown in table 1.
TABLE 1 phenolic foam composite board Performance test results
Figure BDA0002205671970000091
Figure BDA0002205671970000101
As can be seen from Table 1, compared with the comparative example, the phenolic foam composite board provided by the invention has the advantages of low water absorption rate and wet expansion rate, high flexural strength and impact strength and high flame retardant grade.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (9)

1. The phenolic foam composite board is characterized by comprising a first unsaturated resin layer, a first medium-alkali glass fiber net layer, a phenolic foam core layer, a second medium-alkali glass fiber net layer and a second unsaturated resin layer which are sequentially laminated;
the preparation raw materials of the phenolic foam core layer comprise: waste phenolic foam, a framework material, fibers, a high-molecular anti-cracking material, a binder and water;
the framework material comprises magnesium oxide and magnesium chloride; the mass ratio of the magnesium oxide to the magnesium chloride is (3-4): (2-3);
the fibers comprise plant fibers and/or glass fibers;
the high-molecular anti-cracking material comprises ethylene-vinyl acetate copolymer;
the binder comprises styrene-acrylic emulsion.
2. The phenolic foam composite board as claimed in claim 1, wherein in the raw materials for preparing the phenolic foam core layer, the mass ratio of the waste phenolic foam, the framework material, the fiber, the high polymer anti-cracking material, the binder and the water is (25-55): (9-14): (0.5-2): (3.5-6): (3-5): (10-20).
3. The phenolic foam composite board as claimed in claim 1 or 2, wherein the waste phenolic foam is pre-treated prior to use; the pretreatment method comprises the steps of crushing waste phenolic foam, mixing the crushed waste phenolic foam with a surfactant, washing with water until the pH value of the obtained washing liquid is 6-7, and then filtering and drying.
4. The phenolic foam composite board as claimed in claim 1 or 2, wherein the phenolic foam core layer has a thickness of 5 to 20 mm.
5. The phenolic foam composite board of claim 1, wherein the unsaturated resin in the first and second unsaturated resin layers comprises 191#And (3) resin.
6. The phenolic foam composite board according to claim 1, wherein the first and second medium alkali glass fiber mesh layers independently have a thickness of 20 to 150 mm;
the thicknesses of the first unsaturated resin layer and the second unsaturated resin layer are independently 0.5-1 mm.
7. The phenolic foam composite board as claimed in claim 1, 2, 5 or 6, wherein the density of the phenolic foam composite board is 90-140 kg/m3。
8. A method for preparing the phenolic foam composite board as claimed in any one of claims 1 to 7, which is characterized by comprising the following steps:
mixing waste phenolic foam, a framework material, fibers, a high-molecular anti-cracking material, a binder and water to obtain a phenolic foam core raw material solution;
sequentially placing the medium-alkaline glass fiber net, the phenolic foam core raw material liquid and the medium-alkaline glass fiber net in a mold, performing cold press molding, and demolding to obtain a semi-finished plate;
and spraying unsaturated resin on the upper surface and the lower surface of the semi-finished plate to obtain the phenolic foam composite plate.
9. The preparation method of claim 8, wherein the cold press molding temperature is 5-40 ℃, the time is 45-50 h, and the pressure is 150-250 MPa.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8429547D0 (en) * 1983-11-25 1985-01-03 Bristol Composite Mat Structural panel
US4784902A (en) * 1985-09-19 1988-11-15 Geoffrey Crompton Components that can exhibit low smoke, toxic fume and burning characteristics, and their manufacture
CN202031187U (en) * 2011-03-07 2011-11-09 营口象圆新材料工程技术有限公司 Phenolic aldehyde composite fireproof insulation board for building
CN104985648A (en) * 2015-06-24 2015-10-21 中国林业科学研究院木材工业研究所 Flame-retardant composite plate containing phenolic foam crushed material and manufacturing method and application thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8429547D0 (en) * 1983-11-25 1985-01-03 Bristol Composite Mat Structural panel
US4784902A (en) * 1985-09-19 1988-11-15 Geoffrey Crompton Components that can exhibit low smoke, toxic fume and burning characteristics, and their manufacture
CN202031187U (en) * 2011-03-07 2011-11-09 营口象圆新材料工程技术有限公司 Phenolic aldehyde composite fireproof insulation board for building
CN104985648A (en) * 2015-06-24 2015-10-21 中国林业科学研究院木材工业研究所 Flame-retardant composite plate containing phenolic foam crushed material and manufacturing method and application thereof

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