CN111500155A - Modified cork composite material - Google Patents
Modified cork composite material Download PDFInfo
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- CN111500155A CN111500155A CN202010483334.4A CN202010483334A CN111500155A CN 111500155 A CN111500155 A CN 111500155A CN 202010483334 A CN202010483334 A CN 202010483334A CN 111500155 A CN111500155 A CN 111500155A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D131/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an acyloxy radical of a saturated carboxylic acid, of carbonic acid, or of a haloformic acid; Coating compositions based on derivatives of such polymers
- C09D131/02—Homopolymers or copolymers of esters of monocarboxylic acids
- C09D131/04—Homopolymers or copolymers of vinyl acetate
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
- C09D133/04—Homopolymers or copolymers of esters
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- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D161/00—Coating compositions based on condensation polymers of aldehydes or ketones; Coating compositions based on derivatives of such polymers
- C09D161/04—Condensation polymers of aldehydes or ketones with phenols only
- C09D161/06—Condensation polymers of aldehydes or ketones with phenols only of aldehydes with phenols
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
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- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/18—Fireproof paints including high temperature resistant paints
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/18—Applications used for pipes
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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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
- 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
Abstract
The invention discloses a modified cork wood composite material which comprises the following raw materials in parts by weight: 0-100 parts of adhesive, 5-55 parts of functional cork, 2-35 parts of functional material, 17-450 parts of diluent, 0-35 parts of auxiliary agent and 0-25 parts of pigment; the functional cork comprises: at least one of cork powder, puffed and softened cork, carbonized cork and semi-carbonized cork; the functional material comprises: flame retardants, preservatives, bactericides and/or coloring pigments. The invention reduces the weight of the protective product, improves the ablation heat-insulating property, and avoids the problems of brittle fracture and falling off caused by ablation shrinkage due to the addition of the boron phenolic flame-retardant material in the modified cork; in the application of the protective material in the civil field, the weight is lighter, the heat insulation performance and the ageing resistance are better, and the service life of the protective product is finally prolonged.
Description
Technical Field
The invention relates to the technical field of biological composite materials, in particular to a modified cork composite material.
Background
Cork has good heat insulation performance, and is widely used in civil fields as a heat insulation material, such as beam columns, wall surfaces, roof panels, tile members and the like of building steel structure houses. The cork has the advantages of low thermal conductivity coefficient, light specific gravity, good process performance, wide source, low price and the like, and is also applied to the thermal protection field of various aerospace vehicles. For example, an "Apollo" spacecraft employs cork as a heat shield, and cork thermal protection is attached to both the "Aliran" launch vehicle satellite fairing and the tertiary cryogenic tank. The shells of CZ-3, CZ-2E carrier rocket satellite fairings and booster rocket fairings in China are also adhered with cork wood materials. The formed composite cork sheet material is generally adhered to the surface of a product one by one through an adhering process, and is adhered to complex parts which are easy to be impacted, so that cracks are easy to generate, the potential safety hazard of easy falling exists, and the ablation resistance and heat insulation performance of the product are influenced. Meanwhile, the thermal conductivity of the common cork material is higher than that of the modified cork (the thermal conductivity of the common cork is 0.06, and the thermal conductivity of the modified cork is 0.04), and the thermal protection layer on the surface of the appliance working under the conditions of high heat flow, strong vibration and ablation is easy to deform, shrink, crack and fall off, so that the thermal protection performance on the surface of the appliance is influenced. The above-mentioned shortcomings of the existing cork make its application in high technology fields limited.
In addition, because the cork has the performances of corrosion resistance, heat insulation and light weight, the cork is used as a protective material coating, and provides higher and more updated requirements for the variety and the performance of the coating, thereby promoting the improvement and the improvement of the traditional coating variety and the development and the application of high-performance variety. At present, most of traditional metal and plastic surface anticorrosive and heat-insulating coatings are polymer synthetic coatings, and have unsatisfactory heat insulation performance and ageing resistance, and the traditional protective material coatings are not environment-friendly. The existing protective materials on the surfaces of metal furniture, seats, beds, table tops and armrests have poor flame retardant performance and comfort performance, and particularly, the protective materials on the surfaces of the metal furniture are flammable and have potential safety hazards in case of fire.
Disclosure of Invention
In view of the above-mentioned drawbacks or shortcomings, it is an object of the present invention to provide a modified cork composite material.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a modified cork composite material comprises the following raw materials in parts by weight:
the adhesive comprises: solvent-based adhesives, rubber-based adhesives and/or emulsion-based adhesives; the solvent-based adhesive comprises: at least one of epoxy resin glue, polyurethane glue and organic silicon resin glue;
the functional cork comprises: at least one of cork powder, puffed and softened cork, carbonized cork and semi-carbonized cork;
the functional material comprises: flame retardants, preservatives, bactericides, and/or coloring pigments;
the auxiliary agent comprises: leveling agent, defoaming agent, dispersant, hydrophobic agent, thickener, accelerator and wetting agent.
The rubber-type adhesive comprises: at least one of chloroprene rubber, nitrile rubber, styrene butadiene rubber and silicon rubber; the emulsion type adhesive comprises at least one of polyurethane emulsion, epoxy resin emulsion, organic silicon emulsion, polyacrylate emulsion and VAE emulsion, and the solid content is 23-50%.
The flame retardant comprises: at least one of high silica glass powder, hollow silica micro powder, ceramic micro-beads, ammonium polyphosphate and boron phenolic aldehyde; the preservative is as follows: comprises at least one of zinc powder and graphene.
The cork powder is purified 99% cork powder, the granularity of the purified cork powder is 80-120 meshes, and the granularity of the puffed soft cork, the carbonized cork and the semi-carbonized cork is 80-300 meshes.
The epoxy resin adhesive comprises a curing agent, the epoxy resin is polyamide resin E-44, and the ratio of the epoxy resin adhesive to the curing agent is 2:1 or 1:1 to form a reaction curing type coating adhesive; the curing agent is low molecular polyamide 651 or 650; the cork composite material is a cork light ablation heat insulation protective coating.
5 parts of cork powder or carbonized cork powder or a mixture of the cork powder and the carbonized cork powder, 55 parts of polyurethane, 5 parts of coloring pigment, 23 parts of diluting solvent, 8 parts of preservative, 3.4 parts of auxiliary agent and 2 parts of graphene; the preservative is zinc composite powder or zinc phosphate, and the auxiliary agent comprises 0.6 part of wetting agent, 0.6 part of dispersing agent, 0.7 part of thickening agent, 0.6 part of bactericide, 0.5 part of flatting agent and 0.4 part of defoaming agent; the diluting solvent is water.
10 parts of cork powder, 9 parts of flame retardant, 17 parts of diluent, 15 parts of coloring pigment and 2.7 parts of hydrophobic agent; the flame retardant is a mixture of 4 parts of ceramic microspheres and 5 parts of hollow silicon dioxide micropowder, and the coloring pigment is rutile titanium dioxide powder; the particle size of the rutile titanium dioxide powder and the talc powder is 400-800 meshes.
The modified cork composite material also comprises light calcium carbonate for filling, and the granularity of the light calcium carbonate is 0.5-15 um; the diluting solvent is water.
40 parts of semi-carbonized cork, 77 parts of adhesive, 15 parts of diluent solvent, 5 parts of flame retardant, 23 parts of curing agent and 2 parts of light calcium carbonate powder, wherein the adhesive is modified epoxy resin, the diluent solvent is absolute ethyl alcohol, and the flame retardant is any one of ammonium polyphosphate, high silica glass powder and boron phenolic; the ratio of the modified epoxy resin to the curing agent is 10: 3.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a modified cork composite material, 1, which adopts natural renewable oak bark with a cellular structure of a honeycomb-shaped inflatable structure to process purified cork, puffed cork and carbonized cork. The cork is divided into ablation foaming cork flame-retardant material and flame-retardant material formed by mixing cork and flame retardant. The special heat insulation/cold property of the puffed and softened cork and the carbonized cork increases the volume of the cork filling material by 15-20%, reduces the volume weight by 15-20%, reduces the heat conductivity coefficient from 0.06 to 0.04, reduces the weight of a protective product, improves the instruments working under the conditions of high heat flow, strong vibration and ablation, and improves the ablation heat insulation property of the surface heat protective material.
2. After the cork, the adhesive and the boron phenolic are fully mixed, the boron phenolic resin has ablation performance and flame retardant property, and is converted from an expansion solid state into a hot melting state when being heated, so that appliances working under the conditions of high heat flow, strong vibration and ablation are prevented, the thermal protection layer on the surface of the appliance is brittle and falls off due to ablation shrinkage, and the safety is ensured. It benefits from the unique physical phenomenon of solid-to-semi-liquid conversion during ablation due to the synergistic effect of epoxy resin, boron phenolic resin and rubber type glue. The advantages are more prominent under the conditions of high heat flow, strong vibration and ablation.
3. The low cost, high efficiency, long life, the adoption of molecular combination stable natural renewable purified cork, puffed soft cork, carbonized cork as functional filling material and high molecular synthetic coating, construction cost reduction than production material is nearly two thirds; compared with the construction efficiency of spraying and pasting the cork paint, the efficiency of construction is improved by more than one time. Compared with the mineral polymer synthetic protective material coating, the coating is lighter in application in civil field equipment, pipelines and facilities, has better heat insulation performance and ageing resistance, can prolong the service life by 2-3 times compared with a plastic foaming material, reduces the reactive power loss of hot gas energy sources of electric and thermal plants, and can reach more than 20 years to the maximum.
4. The cork light ablation heat insulation (cold) protection material is compared with synthetic polymers, ablation reduces the pollution of harmful gas emission such as carbon dioxide to the atmosphere, and is more environment-friendly.
Detailed Description
The present invention will be described in detail with reference to embodiments thereof, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, belong to the scope of the present invention.
Cork wood: commonly known as "wood plug", the bark product, stem and root of tree species with well developed plant wood plug layer and surface protective tissue after growing roughly. The cork skin has the advantages of good elasticity, sealing property, heat insulation property, sound insulation property, electric insulation property and friction resistance, and has the advantages of no toxicity, no smell, small specific gravity, soft hand feeling, fire resistance, flammability class B2, self-extinguishing property and the like. So that the cork or the modified cork has good application prospect in the fields of ablation heat-insulation protective coating, filler/putty or compound glue.
The modified cork is characterized in that the defects of large cork specific gravity, large sand inclusion and more impurities are overcome by adopting a physical and chemical method, and the cork performance is improved. For example:
the cork is purified by removing the heavier sand inclusion and black skin in the cork by adopting a wind power and water floating method so as to improve the purity and reduce the volume weight.
Swelling and crushing the softened cork, adding a proper amount of silicone oil into the cork, and heating and pressurizing by superheated steam; or heating and pressurizing at high frequency, and suddenly decompressing and puffing for a certain time; or wet grinding the soft wood by water soaking to increase the expansion pores of the soft wood particles. The method can expand the volume of the cork by 15-20%, reduce the volume weight by 15-20%, and ensure that the cork has better heat insulation and sound insulation properties.
The carbonized cork is obtained by soaking cork raw material for 24 hours or steaming cork with superheated steam for 2 hours. And then, putting the cork particles into a rotary frying furnace capable of heating and controlling the temperature, and frying, wherein when the temperature in the cork particles reaches over 260 ℃, the swelling pores of the cork particles are increased, the volume is increased by 15-20%, and the weight is reduced by 15-20%. The color changes from yellow to brownish black. The carbonized cork has the advantages of insulating and antistatic performance, and better heat insulation, sound absorption, corrosion prevention and ageing resistance.
The invention provides a modified cork wood composite material which comprises the following raw materials in parts by weight:
the adhesive comprises: solvent-based adhesives, rubber-based adhesives and/or emulsion-based adhesives; the solvent-based adhesive comprises: at least one of epoxy resin glue, polyurethane glue and organic silicon resin glue;
the functional cork comprises: at least one of cork powder, puffed and softened cork, carbonized cork and semi-carbonized cork;
the functional material comprises: flame retardants, preservatives, bactericides, and/or coloring pigments;
the auxiliary agent comprises: leveling agent, defoaming agent, dispersing agent, hydrophobic agent, thickening agent, accelerator (catalyst) and wetting agent.
Preferably, the rubber-type adhesive includes: at least one of neoprene phenolic rubber, nitrile rubber, styrene butadiene rubber and silicon rubber; the emulsion type adhesive comprises at least one of polyurethane emulsion, epoxy resin emulsion, polyacrylate emulsion and VAE emulsion, and the solid content is 23-50%.
Preferably, the flame retardant comprises: at least one of high silica glass powder, hollow silica micro-bead powder, ceramic micro-beads, ammonium polyphosphate and boron phenolic aldehyde; the preservative is as follows: comprises at least one of zinc powder and graphene.
Preferably, the cork powder is purified 99% cork powder, the granularity of the purified cork powder is 80-120 meshes, and the granularity of the puffed soft cork, the carbonized cork and the semi-carbonized cork is 80-300 meshes.
Preferably, the epoxy resin glue comprises a curing agent, the epoxy resin is polyamide resin E-44, and the ratio of the epoxy resin glue to the curing agent is 2:1 or 1:1 to form a reaction curing type coating adhesive; the curing agent is low molecular polyamide 651 or 650; the cork composite material composition of the embodiment is a cork light ablation-resistant heat-insulating protective coating, and is mainly applied to a thermal protective material on the surface of an apparatus working under the conditions of high heat flow and vibration, the diluent solvent of the epoxy resin is absolute ethyl alcohol, and when the epoxy resin adhesive is an epoxy resin E-44 adhesive, the epoxy resin adhesive is a thermal protective adhesive and is mainly used for a high-temperature-resistant coating. In addition, when the epoxy resin adhesive is a modified epoxy adhesive (DG-4 optical transparent adhesive) and is a cryogenic (-196 ℃) adhesive, the epoxy resin adhesive is mainly used for low-temperature-resistant coating, and the problem of cryogenic (-193 ℃) protection is solved by using the biological carbonization modified material. The flame retardant comprises one or more of high silica glass powder (less than or equal to 120 meshes), hollow silica micro-bead powder, ceramic micro-beads, ammonium polyphosphate and boron phenolic aldehyde. The boron phenolic aldehyde has good flame retardant property and oxidation resistance, so that the heat resistance, oxidation resistance and ablation resistance of the resin are improved simultaneously. The deformation shrinkage, cracking and even falling of the surface thermal protection material of the appliance working under the conditions of high heat flow, strong vibration and ablation are avoided.
It is noted that boron phenolic aldehyde has good flame retardant and oxidation resistance properties, and unstable boric acid (HBO) is generated due to water loss of boric acid at 171 DEG C2) When the temperature rises to about 270 ℃, the boric acid continues to dehydrate to generate stable B2O3When the temperature is higher than 325 ℃, B2O3The resin is transformed into a compact glass state structure, so that the mechanical property of the resin is improved, and when the temperature is higher than the temperature, the glass state structure has certain fluidity so as to be attached to the surface of the material to form a compact protective film, and air is blocked from entering the material, so that the resin cork is prevented from further burning, and therefore, the heat resistance, the oxidation resistance and the ablation resistance of the resin are simultaneously improved. The boron phenolic resin has higher resistanceThe heat property and the better instant high temperature resistance can be widely applied to the field of thermal protection of the surface of appliances working under the conditions of high heat flow, strong vibration and ablation and the fields of civil industries such as automobile friction materials, chemical engineering, machinery, steel seats, steel furniture and the like.
In the above embodiment, the natural and renewable oak bark with cellular structure of cellular aerated structure is used to process purified cork, puffed cork, and carbonized cork. The cork is divided into ablation foaming cork flame-retardant material and flame-retardant material formed by mixing cork and flame retardant. The special heat insulation (cold) property of the puffed and softened cork and the carbonized cork increases the volume of the cork filling material by 15-20%, reduces the volume weight by 15-20%, reduces the heat conductivity coefficient from 0.06 to 0.03, reduces the weight of a protective product, improves the appliances working under the conditions of high heat flow, strong vibration and ablation, improves the ablation heat insulation property of a surface heat protective layer, improves the heat insulation (cold) and heat preservation properties of the protective layer in the civil chemical industry and machinery, and improves the heat insulation (cold), heat preservation and comfort properties of metal seats and steel clamps.
In addition, after the cork, the adhesive and the boron phenolic are fully utilized to be mixed, as the boron phenolic resin has ablation performance and flame retardant property, the boron phenolic resin is converted into a hot melting state from an expansion solid state when being heated, the poly-phosphorus acid is heated to decompose phosphorus gas, block oxygen and resist flame, the high heat resistance and the vibration resistance of a thermal protection material on the surface of the appliance working under the conditions of high heat flow, strong vibration and ablation are improved, the safety is ensured, and the thermal protection coating is prevented from deforming, shrinking, cracking and falling off. So that the special properties of high heat resistance and vibration resistance must be achieved during the ablation of the composite coating. The defects that the existing other thermal protection materials are brittle and fall off due to ablation shrinkage are overcome, and the safety is ensured. The boron phenolic resin and the rubber type glue have the unique physical phenomenon of converting from a solid state to a semi-liquid state during ablation. Under the condition of high heat flow, the advantages are more prominent.
In some possible implementations, the modified cork composite is a cork ablative-resistant, thermal-insulating protective coating, a thermal/cold, corrosion-resistant, aging-resistant aqueous cork composite coating, a water-resistant, thermal-insulating cork composite coating, a cork composite thermal-insulating, corrosion-resistant, aging-resistant coating molding filler or putty, a biological cork composite glue; the coating can be carried out by using an air compressor, a cement paste spraying kettle, a paint spraying gun and an electric high-pressure spraying machine for spraying or scraping by a scraper, reacting, volatilizing, curing and forming, or heating and volatilizing, or filling into a mold, pressurizing, heating and curing and forming.
Specifically, the modified cork composite material comprises the following raw materials in parts by weight:
the modified cork composite material of the embodiment is a cork ablation-resistant and heat-insulating protective coating, and is mainly applied to the field of thermal protection of the surface of an appliance working under the conditions of high heat flow, strong vibration and ablation; the metal furniture can be applied to civil heating power, electric power, chemical production equipment, pipeline heat insulation and refrigerated trucks, and can be even sprayed on the outer surface of the metal furniture, so that the metal furniture is more attractive in appearance, has the touch feeling of being warm in winter and cool in summer, improves the use comfort, and plays a better antirust role.
The preparation method of the cork compound ablation-resistant heat-insulating protective coating in the embodiment comprises the following steps: weighing and metering the epoxy adhesive curing agent according to the design requirements of different-purpose coatings under the conditions that the temperature is more than or equal to 25 ℃ and the normal temperature, weighing and metering the components of various materials according to the ratio of the components, pouring the epoxy adhesive curing agent into a material barrel of a stirrer containing the adhesive curing agent according to the proportion of the adhesive and the curing agent by using a diluent solvent which accounts for 20 percent of the total dilution amount, and stirring for 3-5 minutes until the epoxy adhesive curing agent. Mixing other functional materials and solid auxiliary agent uniformly, pouring into a material barrel of a stirrer, stirring for 5-10 minutes until uniform, adding the auxiliary agent, stirring for 3-5 minutes, and adding cork powder with different meshes according to requirements. Stirring for 10-20 min according to the total weight and the spraying curing time, subpackaging into a paint bucket, pouring the stirred sizing material and the curing agent into the stirring bucket for mixing according to the spraying time and the requirement during spraying, and then adding the rest diluting solvent. Adding the functional material, the auxiliary agent and the cork in sequence, adding the rest diluent, and spraying.
It should be noted that the diluent solvent matched with the epoxy resin adhesive is 99% absolute ethyl alcohol, the diluent solvent matched with the polyurethane adhesive is any one of xylene, rosin water and acetone, the diluent solvent matched with the rubber adhesive is ethyl acetate and xylene, and the diluent of the water-based adhesive is water.
In the embodiment, the spraying process method for the construction of the cork compound ablation-resistant heat-insulating protective coating comprises the following steps: firstly, cleaning dust and oil stains on the surface of a spraying device by using a solvent absolute ethyl alcohol, and roughening the surface of stainless steel with a too smooth surface by using 60-mesh abrasive paper, and then cleaning. The surface which does not need to be sprayed is pasted with color separation paper or is worn with a plug which is easy to remove.
The polyurethane adhesive comprises a two-component polyurethane adhesive and a single-component polyurethane adhesive, wherein the two-component polyurethane adhesive comprises polyurethane and a curing agent, and the mixing ratio of the polyurethane to the curing agent is 1:1 or 1.2: 1. The epoxy resin or the two-component polyurethane type adhesive PU and the curing agent are respectively mixed before spraying, and when in use, the epoxy resin or the two-component polyurethane type adhesive PU and the curing agent are poured into a stirrer together and stirred for 5 to 20 minutes until the epoxy resin or the two-component polyurethane type adhesive PU and the curing agent are uniformly mixed for standby. Selecting the following components according to the particle size of cork powder in the coating: spraying with air compressor and stone paint spraying pot below 80 mesh, and spraying with air compressor and paint spraying gun or motor-driven electric paint equipment above 80 mesh. The adhesive and the putty are constructed according to the conventional method. The special requirements include manual painting, scraping and spraying, and the larger thickness is formed by pouring and curing by a mould (reactive epoxy glue). The reactive coating is prepared by pouring the mixed sizing material and curing agent together according to the required time and the required thickness, and adjusting the coating to the dilution convenient for spraying by using the rest 20 percent of diluent. The spraying environment needs air draft equipment, and open fire electrical equipment is forbidden. In winter, the room temperature is more than or equal to 25 ℃, epoxy and silicon rubber liquid and water-based paint exist in the room at more than or equal to 25 ℃, and the solvent is diluted while the solvent is taken.
Example 6, a modified cork composite material comprising the following raw materials in parts by weight: 5 parts of a mixture of cork powder and carbonized cork powder, 55 parts of polyurethane, 2 parts of graphene, 8 parts of zinc composite material powder or zinc phosphate, 0.6 part of wetting agent, 0.6 part of dispersing agent, 0.7 part of thickening agent, 0.6 part of bactericide, 0.5 part of flatting agent, 0.4 part of defoaming agent, 5 parts of coloring pigment and 23 parts of diluent (water). Preferably, the particle size of the cork powder is less than or equal to 80-300 meshes.
The preparation of the cork composite material of the above embodiment specifically comprises the following steps:
1) the preparation method comprises the steps of mixing and stirring graphene, zinc oxide, cork powder or carbonized cork powder, adsorbing and dispersing the zinc powder composite material by utilizing the honeycomb structural holes damaged on the cork surface, and uniformly mixing the zinc powder composite material with a large surface area and a unique two-bit lamellar structure. Or mixing the cork powder and the graphene uniformly. Stirred for 30 minutes.
2) Adding water, a dispersing agent, a wetting agent, a defoaming agent, a bactericide, a thickening agent and a pigment into the waterborne polyurethane according to the ratio of parts by weight. Stirring for 5 minutes, adding a mixture of cork smaller than or equal to 250 meshes, graphene and zinc powder (or a graphene/zinc composite material), continuously stirring for 15 minutes, and adding a coloring pigment and a leveling agent. The water-based cork composite coating for heat insulation/cold insulation, corrosion prevention and aging resistance is obtained, and is mainly used for plastic or metal furniture, seats, bedding, table tops and armrests; outdoor high-voltage power line towers, wind energy and solar upright towers; building beam columns, wall surfaces, roof panels and tile components of a metal structure house; oil brick well platform. Has the advantages of environmental protection, no toxicity, high corrosion resistance, rust prevention, water prevention, heat insulation (cold and hot), heat preservation and skid resistance.
Example 7, a modified cork composite material comprising the following raw materials in parts by weight: 15 parts of high-performance organic silicon emulsion, 25 parts of polyacrylate emulsion, 10 parts of cork powder, 4 parts of ceramic microspheres, 5 parts of hollow silica microsphere powder, 4 parts of talcum powder, 1 part of cosolvent, 1 part of multifunctional assistant, 0.3 part of defoamer, 2.7 parts of hydrophobing agent, 15 parts of coloring pigment and 17 parts of diluent (water). Specifically, the coloring pigment is rutile titanium dioxide powder, the particle sizes of the rutile titanium dioxide powder and the talcum powder are 400-800 meshes, the cosolvent is 95% +/-2 propylene glycol, the multifunctional auxiliary agent is alkyl acid polyoxyethylene ether, the hydrophobic agent is an ultramarine S2 type agent, and the defoaming agent is 25% +/-5 methyl silicone oil. Further, the cork is any one of expanded cork, decolored cork and carbonized cork. The modified cork composite material composition of the embodiment is a waterproof heat-insulation cork composite coating, and has the advantages that the volume of the expanded cork and the carbonized cork is enlarged, and the heat insulation and heat preservation performance is improved; the decolored cork makes the white cork more beautiful; the carbonized cork has the advantages of corrosion resistance, rust prevention, insulation, aging resistance and capability of prolonging the service life of a protective product. The coating is mainly used for the antirust and anticorrosive beam columns of buildings such as factory buildings, warehouses, hospitals, schools, supermarkets, houses and the like, and protective coatings on the surfaces of wall surfaces, roof panels and tile components, so that the steel structure buildings have the performances of heat insulation, sound insulation, heat preservation, shock resistance, moisture resistance, insulation, water resistance and the like, preferably, the thickness of the coating of a protective material applied to the structural surfaces of the buildings is generally 0.1 cm-1 cm or 1 cm-5 cm, and particularly, the coating is applied to the protective coatings of the external walls of the buildings and has the performances of heat preservation, water resistance, scouring resistance and ageing resistance; the protective coating on the surfaces of the plastic seat, the metal furniture, the seat, the bed, the tabletop and the armrests enables the product to have the performances of corrosion resistance, rust resistance, heat insulation, heat preservation and the like, and the use comfort level is further improved; compared with the mineral polymer synthetic protective material coating, the coating is lighter in application in civil field equipment, pipelines and facilities, has better heat insulation performance and ageing resistance, can prolong the service life by 2-3 times compared with a plastic foaming material, reduces the reactive power loss of hot gas energy sources of electric and thermal plants, and can reach more than 20 years to the maximum.
The preparation method of the heat-insulating waterproof antirust cork composite coating comprises the following specific steps:
1. firstly, the cork powder or carbonized cork, talcum powder, rutile titanium dioxide, ceramic microspheres and hollow silica microsphere powder which meet the requirements of mesh and quality are weighed according to the proportion requirement, put into a mixer to be stirred for 20 minutes and uniformly mixed to form cork functional filler, and the cork functional filler is mutually attached to micropores on the surface of the cork and taken out for standby.
2. The cosolvent, the multifunctional auxiliary agent, the hydrophobing agent and a part of water are stirred in a stirrer again according to the formula, and the coloring pigment and a part of cork functional filler are sequentially added under slow stirring. Stirring at high speed for 20 minutes, adding the organosilicon emulsion, polyacrylate emulsion and defoaming agent into the dispersed pigment dispersion liquid under slow stirring according to the formula after the detection fineness is less than or equal to 40mm, and stirring at the speed of more than or equal to 800 revolutions per minute for 40 minutes. After stirring uniformly, slowly adding another part of the cork functional filler left under the condition of 200 revolutions per minute, and continuing stirring. And gradually adding diluent water according to the degree of dilution until the mixture is uniformly dispersed, so that the spraying is convenient.
Example 8, a modified cork composite material comprising the following raw materials in parts by weight: 100 parts of VAE emulsion (vinyl acetate-ethylene copolymer emulsion), 10 parts of cork or carbonized cork, 20 parts of water and 2 parts of light calcium carbonate; the cork is one or the combination of natural pure cork, puffed cork and carbonized cork, water is used as a diluent, and the functional material preservative is zinc oxide and light calcium is used as a filler. The cork composite material composition of the embodiment is a biological cork composite glue, belongs to a cork composite liquid and semi-liquid material, is mainly used for paving indoor and outdoor ground rubber cork floors and pasting indoor cork floors, wallboards, wallpaper and other materials, and has the advantages that cork is natural, non-toxic and environment-friendly, cork contains a tannin (tannin) substance, plant tannin exists in barks and fruits of various trees (such as rubber trees and lacquer trees)), and is also a main component in galls generated by insect attack on the trees, and the content of the galls can reach 50-70%. The tannin is yellow or brown yellow amorphous loose powder, has strong hygroscopicity, is easy to dissolve in water, and the tannin aqueous solution has the property of semi-colloidal solution, so that the biological cork adhesive in the embodiment has stronger viscosity, is natural and environment-friendly, and simultaneously enhances the moisture absorption and absorption performance of the biological cork adhesive; the cork has larger friction coefficient, is mixed with the VAE sizing agent, greatly improves the bonding property, lightens the weight of the adhesive, improves the water resistance of the adhesive, increases the performances of heat insulation, heat preservation and sound insulation, improves the capacities of corrosion resistance, oxidation resistance and environment adaptation compared with other chemical polymer adhesives, and expands the application range from indoor to outdoor so as to expand the application range.
The light calcium carbonate is white powder, tasteless and odorless; the granularity is 0.5-15 um; a specific gravity of about 2.71; decomposing at 825-896.6 deg.C, melting point 1339 deg.C; is insoluble in water and alcohol, soluble in acid, stable in air, and slightly hygroscopic. The biological cork compound adhesive mainly plays a role in filling, increases the thickness of the adhesive, enables the biological cork compound adhesive to be plump and firm, improves the product quality, and reduces the cost.
The preparation method of the biological cork compound adhesive comprises the following specific steps:
1. firstly, weighing functional cork, preservative and light calcium according with the parts by mass requirement respectively, loading the weighed materials into a mixer, stirring for 15-20 minutes, uniformly mixing, and pouring out for later use.
2. Weighing the adhesive in parts, pouring the adhesive into a reaction kettle or a normal-temperature (more than or equal to 20 ℃) stirrer for stirring, simultaneously adding parts of diluent water, stirring and heating the mixture, and enabling the temperature to reach more than or equal to 30 ℃ to thin the adhesive liquid (the temperature can not be increased any more), and uniformly mixing the adhesive liquid with water.
3. And adding the uniformly mixed powder of the functional cork, the preservative and the filler into the uniformly stirred water-gel emulsion while stirring, and stirring for 20-30 minutes until the mixture is uniform.
4. Weighing and filling into a glue barrel under the condition that the temperature of the residual glue solution is thinner.
Example 9, a modified cork composite material comprising the following raw materials in parts by weight: 77 parts of modified epoxy resin J241 (produced by chemical research institute of academy of sciences of Heilongjiang province), 23 parts of curing agent, 40 parts of purified cork powder or carbonized cork, 15 parts of absolute ethyl alcohol, 5 parts of ammonium polyphosphate, high silica glass powder or boron phenolic aldehyde and 2 parts of light calcium carbonate powder; the ratio of the modified epoxy resin to the curing agent is 10:3, the ammonium polyphosphate, the high-silica glass powder and the boron phenolic aldehyde are fireproof and flame-retardant functional materials, the boron phenolic aldehyde has good flame-retardant performance and oxidation resistance, and the light calcium carbonate powder is a thickening agent; the modified cork composite material composition of the embodiment is a cork composite heat-insulation, anti-corrosion and anti-aging coating molding filler or putty, and has the advantages that the density is less than or equal to 0.7g/cm3, the heat conductivity coefficient is less than or equal to 0.2w/(m.k), the fireproof, anti-corrosion and anti-aging performances of a higher molecular material are better, the service life is longer by more than 20 years, the modified cork composite material composition is mainly used for sticking a high-ablation-resistant sheet cork thermal protection material, and the temperature resistance is more than or equal to 200 ℃; manufacturing a light epoxy glass fiber steel skeleton of the wind energy fan blade; when the thermal protection material is adhered under the conditions of high heat flow, strong vibration and ablation, the riveting hole is filled with putty mixed with cork and modified epoxy resin J241; when the coating is applied to steel furniture, seats, beds and other civil products, the bottom surface is leveled when the thermal insulation wood-like thermal insulation coating is sprayed on the coating.
The boron phenolic aldehyde has good flame retardant property and oxidation resistance, and has ablation resistance, low smoke, low toxicity, low heat productivity and high carbon residue. The main mechanism is as follows: due to the introduction of a B-O bond with high bond energy in the boron phenolic resin, the thermal decomposition temperature of the resin is obviously improved, the heat resistance is enhanced, the carbon residue rate is increased, compact glassy carbon can be generated on the surface of the resin at high temperature, the glassy carbon can effectively prevent oxygen from entering the resin, further combustion of the resin is inhibited, and the flame retardant property of the resin is improved, so that the high-temperature stability and the oxidation resistance of the material are greatly improved.
Light calcium carbonate, also called precipitated calcium carbonate, is called light calcium powder for short, and is prepared by burning limestone and other raw materials in sections to generate lime and carbon dioxide, adding water to digest the lime to generate lime milk (main component of calcium hydroxide), introducing carbon dioxide to carbonize the lime milk to generate calcium carbonate precipitate, dehydrating, drying and pulverizing. Or the double decomposition reaction of sodium carbonate and calcium chloride to produce calcium carbonate precipitate, dewatering, drying and crushing. The light calcium carbonate is used as filler, can be quickly cured and formed, and reduces the cost.
The invention has the beneficial effects that:
1) the invention mainly adopts natural renewable oak bark with cellular structure of honeycomb-shaped inflatable structure to process purified cork, puffed softened cork and carbonized cork (granularity is 80-300 meshes). The cork particles are an ablation foaming cork flame-retardant heat-insulation material and a flame-retardant material formed by mixing cork and a flame retardant. The special heat insulation (cold insulation) performance of the puffed and softened cork and the carbonized cork is that the volume of the cork material is increased by 15-20%, the volume weight is reduced by 15-20%, the heat conductivity coefficient of the low-density material is reduced from 0.06 to 0.03, the volume is expanded again during ablation, the heat insulation performance is improved again, the weight is reduced again, and the effective load of an appliance working under the conditions of high heat flow, strong vibration and ablation and the ablation, heat insulation, cold insulation and environmental protection performance in the operation process are improved.
2) The thermal protection material fully plays a role in converting the expansion solid state of cork, rubber glue, boron phenolic aldehyde and a mixture thereof into a hot melt state when being heated, improves the performance of high heat resistance and vibration resistance necessary for the surface protection material of the appliance working under the conditions of high heat flow, strong vibration and ablation, ensures safety, and prevents the thermal protection material from deformation, shrinkage, cracking and falling off. It benefits from the unique physical phenomenon of solid-to-semi-liquid conversion during ablation of natural cork, rubber liquid and boron phenolic. Under the condition of high heat flow, the advantages are more prominent.
3) The biological natural expanded cork composite coating has the functions of insulation and static resistance, and the carbonized cork composite coating also has unique functions of absorbing electric waves and sound waves and absorbing sound, so that the composite coating of the modified cork has a sound insulation effect, and the sound insulation effect in a building with a steel structure is good.
In addition, the modified cork compound coating enables a steel structure building to have the performances of heat insulation, sound insulation, heat preservation, shock resistance, moisture resistance, insulation, water resistance and the like, preferably, the thickness of the coating of the protective material applied to the surface of the structure of the building is generally 0.1 cm-1 cm or 1 cm-5 cm, and particularly, the modified cork compound coating is applied to the protective coating of the outer wall of the building and has the performances of heat preservation, water resistance, scouring resistance and ageing resistance; the protective coating on the surfaces of the plastic seat, the metal furniture, the seat, the bed, the tabletop and the armrests enables the product to have the performances of corrosion resistance, rust resistance, heat insulation, heat preservation and the like, and the use comfort level is further improved; compared with the mineral polymer synthetic protective material coating, the coating is lighter, and has better heat insulation performance and ageing resistance when applied to equipment, pipelines and facilities in the civil field.
4) The natural polymer synthetic coating which adopts the natural renewable purified cork, the puffed cork and the carbonized cork with stable molecular combination as the functional filling material has low cost, high efficiency and long service life, and the product cost is reduced by nearly two thirds compared with the production material cost; compared with the construction efficiency of spraying and pasting the modified cork paint, the construction efficiency is improved by more than one time. The coating of the protective material synthesized by higher molecules applied to equipment, furniture, chemical engineering, heat and electric pipelines and facilities in the civil field has better adhesion and ageing resistance, the service life can be prolonged by 2-3 times, the reactive power loss of hot gas energy is reduced, and the service life of the product is prolonged, and can reach more than 20 years to the maximum.
5) The cork is beneficial to protecting the ecological atmospheric environment, the application of the reproducible cork has protected the forest ecology, and the cork light ablation heat insulation (cold) protective material is more environment-friendly compared with the synthetic polymer. The cork has high added value utilization, improves the purchase price of raw materials, and mobilizes the enthusiasm of forest farmers for protecting, building and utilizing cork oak forests. Realizes the virtuous cycle of richness, mountain green and water elegance, and harmonious relation between people and nature.
It will be appreciated by those skilled in the art that the foregoing embodiments are merely preferred embodiments of the invention, and thus, modifications, variations and equivalents of the parts of the invention may be made by those skilled in the art, which are still within the spirit of the invention and which are intended to be within the scope of the invention.
Claims (9)
1. The modified cork composite material is characterized by comprising the following raw materials in parts by weight:
the adhesive comprises: solvent-based adhesives, rubber-based adhesives and/or emulsion-based adhesives; the solvent-based adhesive comprises: at least one of epoxy resin glue, polyurethane glue and organic silicon resin glue;
the functional cork comprises: at least one of cork powder, puffed and softened cork, carbonized cork and semi-carbonized cork;
the functional material comprises: flame retardants, preservatives, bactericides, and/or coloring pigments;
the auxiliary agent comprises: leveling agent, defoaming agent, dispersant, hydrophobic agent, thickener, accelerator and wetting agent.
2. A modified cork composite according to claim 1, characterized in that the rubber-type glue comprises: at least one of chloroprene rubber, nitrile rubber, styrene butadiene rubber and silicon rubber; the emulsion type adhesive comprises at least one of polyurethane emulsion, epoxy resin emulsion, organic silicon emulsion, polyacrylate emulsion and VAE emulsion, and the solid content is 23-50%.
3. The modified cork composite according to claim 1, wherein the flame retardant comprises: at least one of high silica glass powder, hollow silica micro powder, ceramic micro-beads, ammonium polyphosphate and boron phenolic aldehyde; the preservative is as follows: comprises at least one of zinc powder and graphene.
4. The modified cork composite material according to claim 1, wherein the cork powder is purified 99% cork powder, and the purified cork powder has a particle size of 80-120 mesh, and the expanded softened cork, carbonized cork, and semi-carbonized cork have particle sizes of 80-300 mesh.
5. A modified cork composite according to claim 1, 3 or 4, characterized in that the epoxy glue comprises a curing agent, the epoxy resin being a polyamide resin E-44, the epoxy glue and curing agent being present in a ratio of 2:1 or 1:1 to form a reaction curing type coating adhesive; the curing agent is low molecular polyamide 651 or 650; the cork composite material is a cork light ablation heat insulation protective coating.
6. The modified cork composite material according to claim 1 or 2, characterized in that 5 parts of cork powder or carbonized cork powder or a mixture thereof, 55 parts of polyurethane, 5 parts of coloring pigment, 23 parts of diluting solvent, 8 parts of preservative, 3.4 parts of assistant, and further comprising 2 parts of graphene; the preservative is zinc composite powder or zinc phosphate, and the auxiliary agent comprises 0.6 part of wetting agent, 0.6 part of dispersing agent, 0.7 part of thickening agent, 0.6 part of bactericide, 0.5 part of flatting agent and 0.4 part of defoaming agent; the diluting solvent is water.
7. The modified cork composite according to claim 1, characterized in that cork powder 10 parts, flame retardant 9 parts, diluent 17 parts, coloring pigment 15 parts, hydrophobic agent 2.7 parts; the flame retardant is a mixture of 4 parts of ceramic microspheres and 5 parts of hollow silicon dioxide micropowder, and the coloring pigment is rutile titanium dioxide powder; the particle size of the rutile titanium dioxide powder and the talc powder is 400-800 meshes.
8. The modified cork composite material according to claim 1, further comprising light calcium carbonate for filling, wherein the light calcium carbonate has a particle size of 0.5-15 um; the diluting solvent is water.
9. The modified cork composite material according to claim 1, wherein the semi-carbonized cork composite material comprises 40 parts of semi-carbonized cork, 77 parts of adhesive, 15 parts of diluent solvent, 5 parts of flame retardant, 23 parts of curing agent and 2 parts of light calcium carbonate powder, wherein the adhesive is modified epoxy resin, the diluent solvent is absolute ethyl alcohol, and the flame retardant is any one of ammonium polyphosphate, high silica glass powder and boron phenolic; the ratio of the modified epoxy resin to the curing agent is 10: 3.
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| CN112592641A (en) * | 2020-12-15 | 2021-04-02 | 郑林义 | Cork composite thermal insulation powder coating material, preparation method thereof and coating |
| CN114012841A (en) * | 2021-10-14 | 2022-02-08 | 德华兔宝宝装饰新材股份有限公司 | Low-smoke antirust flame-retardant plywood and manufacturing method thereof |
| CN115975246A (en) * | 2023-01-12 | 2023-04-18 | 山东农业大学 | Carbonized cork composite polyurethane co-foaming flame-retardant thermal-insulation material and preparation method thereof |
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