CN111285706A - Waterproof modification method for surface of fiber-reinforced foamed cement insulation board - Google Patents

Waterproof modification method for surface of fiber-reinforced foamed cement insulation board Download PDF

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CN111285706A
CN111285706A CN202010200639.XA CN202010200639A CN111285706A CN 111285706 A CN111285706 A CN 111285706A CN 202010200639 A CN202010200639 A CN 202010200639A CN 111285706 A CN111285706 A CN 111285706A
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parts
insulation board
coating
fiber reinforced
foamed cement
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吕春粉
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Zhengzhou Zhitao Information Technology Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
    • C04B41/5024—Silicates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/60—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only artificial stone
    • C04B41/61—Coating or impregnation
    • C04B41/65—Coating or impregnation with inorganic materials
    • C04B41/68—Silicic acid; Silicates
    • 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
    • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/04—Polyurethanes
    • C09D175/08—Polyurethanes from polyethers
    • 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
    • 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
    • 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
    • C08K2201/00—Specific properties of additives
    • C08K2201/002—Physical properties
    • C08K2201/003—Additives being defined by their diameter
    • 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
    • C08K2201/00—Specific properties of additives
    • C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Laminated Bodies (AREA)
  • Building Environments (AREA)
  • Polyurethanes Or Polyureas (AREA)

Abstract

The invention relates to a surface waterproof modification method of a fiber reinforced foamed cement insulation board, which comprises the steps of coating a composite waterproof coating on the surface of the fiber reinforced foamed cement insulation board to form a composite waterproof layer; the composite waterproof coating is mainly prepared from polyisocyanate and the following raw materials in parts by weight: 100 parts of polyether polyol, 0.5-0.6 part of dispersant, 15-20 parts of plasticizer, 39-41 parts of superfine cement, 4-6 parts of silica fume, 10-12 parts of talcum powder, 0.5-0.6 part of hydrogenated castor oil, 0.1-0.2 part of defoaming agent, 0.3-0.4 part of catalyst, 1.0-1.5 parts of latent curing agent and 10-12 parts of solvent oil. According to the waterproof modification method, the composite waterproof layer with the thickness of 0.5-5.0mm is formed on the surface of the fiber reinforced foamed cement insulation board, the volume water absorption rate of the board is greatly reduced, the reduction rate reaches more than 80%, the freeze-thaw resistance cycle performance and the durability of the board are improved, and the service life of the board is prolonged.

Description

Waterproof modification method for surface of fiber-reinforced foamed cement insulation board
Technical Field
The invention belongs to the technical field of foamed cement boards, and particularly relates to a fiber-reinforced foamed cement insulation board surface waterproof modification method.
Background
In recent years, civil buildings, particularly commercial housing buildings, are rapidly developed, and high-rise and super high-rise buildings are continuously emerged; in order to reduce weight, insulate heat and preserve heat and save energy, the exterior thermal insulation material of the building exterior wall mostly takes organic materials as main materials, such as polystyrene foam (EPS), extruded polystyrene foam (XPS), polyurethane foam (PU) and the like, although the organic materials have better thermal insulation performance, the heat resistance is poor and the organic materials are easy to burn. With the overall promotion of building energy conservation, the fire-proof problem of the external wall heat-insulating material is more and more severe, and the A-grade fire-proof heat-insulating board is the development trend.
At present, inorganic heat-insulating plates are also put into use, such as gypsum plates, cement plates, steel wire mesh frame cement sandwich plates and the like, but most of the inorganic plates have the problems of large density, heavy mass, poor heat-insulating property and the like, so that the application effect is difficult to meet the building energy-saving requirement. Therefore, the foamed cement heat-insulation board with light weight and good heat-insulation performance is developed.
The foaming cement heat-insulation board is a cement-based light heat-insulation material prepared by mixing and stirring cement serving as a main cementing material, mineral admixture, additive and water, adding foaming agent for foaming and then curing; the novel heat-insulation brick is characterized in that the interior of the novel heat-insulation brick contains rich fine closed air holes, so that the effects of light weight and heat insulation are achieved. Because the raw materials are mostly inorganic mineral materials, the foaming cement heat-insulation board can meet the A1-grade non-combustible fireproof requirement, and does not generate toxic gas under the conditions of high temperature or fire, so the safety is high; the board has light volume weight and low heat conductivity coefficient, and is an ideal heat-insulating material; the material has good compatibility with building materials, high bonding strength with walls, low drying shrinkage value of the plate, strong wind resistance and is very suitable for being used as a building outer wall maintenance material; it belongs to a closed porous material and has good sound insulation effect; the mortar can be used for directly bonding the wall, the operation is easy, the construction is simple and convenient, and the period is short. Based on the advantages, the foamed cement heat-insulation board is gradually applied to areas such as a wall heat-insulation fireproof isolation belt, an outer wall heat-insulation layer and the like.
In order to pursue the light weight and low price of the foamed cement insulation board and reach the use standard of an ultra-light board, the heat conductivity coefficient of the board is reduced by reducing the dry apparent density of the board, the foaming strength is increased, the porosity is increased, the mechanical property of the board is often rapidly reduced, meanwhile, as the open pores, the communication pores and the microcracks are increased, the water absorption rate of the board is also rapidly increased, the higher water absorption rate can further reduce the strength and durability of the foamed cement insulation board, the service life of the foamed cement insulation board is shortened, and the popularization and use of the foamed cement insulation board in winter and in cold regions are also limited.
Disclosure of Invention
The invention aims to provide a surface waterproof modification method for a fiber reinforced foamed cement insulation board, which can greatly reduce the water absorption of the fiber reinforced foamed cement insulation board.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a fiber reinforced foamed cement insulation board surface waterproof modification method comprises the steps of coating a composite waterproof coating on the surface of a fiber reinforced foamed cement insulation board to form a composite waterproof layer;
the composite waterproof coating is mainly prepared from polyisocyanate and the following raw materials in parts by weight: 100 parts of polyether polyol, 0.5-0.6 part of dispersant, 15-20 parts of plasticizer, 39-41 parts of superfine cement, 4-6 parts of silica fume, 10-12 parts of talcum powder, 0.5-0.6 part of hydrogenated castor oil, 0.1-0.2 part of defoaming agent, 0.3-0.4 part of catalyst, 1.0-1.5 parts of latent curing agent and 10-12 parts of solvent oil; the polyisocyanate is used in an amount such that the isocyanate index R is 1.6 to 1.8.
The thickness of the composite waterproof layer is 0.5-5.0 mm. Preferably, the thickness of the composite waterproof layer is 0.8-3.0 mm.
The coating is wet coating, namely, the surface of the fiber reinforced foamed cement insulation board is wetted by water, and then the composite waterproof coating is coated; the coating mode is spraying, brushing, knife coating or spin coating. The wetting method is to use rolling brush to wet or spray to wet.
The polyisocyanate is diphenylmethane diisocyanate.
The polyether polyol consists of polyether diol 2000D and polyether triol 330N, and the polyether triol 330N accounts for 20-25% of the total mass of the polyether polyol. Polyether glycol provides an intramolecular linear structure, so that the elongation at break of the coating film is improved; polyether trihydric alcohol provides an intramolecular cross-linking structure, so that the tensile strength of a coating film is improved, and the viscosity of the coating is also improved; in combination with the tensile strength and viscosity of the coating, polyether triol 330N preferably accounts for 20-25% of the total mass of the polyether polyol.
The plasticizer is dibutyl phthalate. The plasticizer dibutyl phthalate has the effects of reducing the viscosity of the coating, improving the performance of the coating, reducing the hardness and brittleness of the coating and improving the flexibility of the coating.
The particle size of the superfine cement is 0.2-10 mu m; the particle size of the silica fume is 0.1-0.5 μm; the particle size of the talcum powder is 3-10 mu m. The talcum powder has a lubricating effect and improves the operability and ductility of the coating film in the coating process.
The catalyst is dibutyltin dilaurate; the solvent oil is No. 150 solvent oil. The solvent oil has the function of reducing the viscosity of the coating and is convenient for coating construction.
The composite waterproof coating is prepared by a method comprising the following steps:
1) mixing polyether polyol, a dispersing agent, a plasticizer, talcum powder and hydrogenated castor oil according to the formula amount, stirring and dehydrating at the temperature of 110-120 ℃ under a vacuum condition, then cooling to 60-65 ℃, adding polyisocyanate, stirring uniformly, heating to 85-90 ℃, reacting for 2-4h, then cooling to 50-55 ℃, adding a defoaming agent, a catalyst, a latent curing agent and solvent oil according to the formula amount, and dispersing uniformly to obtain a semi-finished product;
2) adding the superfine cement and the silica fume with the formula amount into the semi-finished product obtained in the step 1), shearing and dispersing at a high speed of 1200-1400rpm for 40-60min, and degassing for 20-30min under a vacuum condition to obtain the cement.
Further, in the step 1) and the step 2), the vacuum condition refers to that the vacuum degree is not lower than 0.085 MPa. Further, the degree of vacuum is preferably 0.09 to 0.10 MPa.
In the step 1), the rotation speed of stirring and dehydration is 800-1000 rpm; the stirring speed after the polyisocyanate addition was 200 and 400 rpm.
According to the waterproof modification method for the surface of the fiber-reinforced foamed cement heat-insulating board, disclosed by the invention, the composite waterproof coating is coated on the surface (front surface and/or back surface and/or side surface) of the fiber-reinforced foamed cement heat-insulating board, and is dried to form a composite waterproof layer with the thickness of 0.5-5.0mm, so that the water absorption of the system of the board can be greatly reduced.
The invention relates to a method for waterproof modification of the surface of a fiber-reinforced foamed cement heat-insulating board, wherein a composite waterproof coating is prepared from polyisocyanateEster and polyether polyol, a dispersant, a plasticizer, superfine cement, silica fume, talcum powder, hydrogenated castor oil, a defoaming agent, a catalyst, a latent curing agent and solvent oil. The reaction of polyisocyanates with polyether polyols to form NCO-terminated polyurethane resins as the main film-forming substance of coatings relies on moisture (H) in the working surface and/or in the air2O) reaction and solidification to form a film, and isocyanate (-NCO) and active hydrogen (-H) react to form the main body structure of the polyurethane composite waterproof film layer. The isocyanate index R is 1.6-1.8, the content of-NCO in the polymer is high, the content of hard segments and the crosslinking density are increased, the polymer can form microphase separation of hard segments and soft segments, the hard segments provide strength and the soft segments provide ductility, the tensile strength, the elongation at break and the bonding strength of the coating are improved, and the coating has a smooth, bright, non-sticky and waterproof surface. -NCO and H in coatings2The reaction of O to generate carbamic acid (-NHCOOH), which is unstable and is easy to decompose to generate CO2Gas, which may cause pinholes, bubbles, etc. on the surface of the coating film; the latent curing agent is added into the coating, and the latent curing agent reacts with water (or moisture) preferentially in a system to generate an active group, and the active group is rapidly crosslinked and cured with isocyanate groups to form a film, so that the generation of gas is avoided, and the phenomena of pores and cracking on the surface of a coating film are avoided.
In the composite waterproof coating used by the invention, superfine cement, silica fume and talcum powder are used as fillers to form a framework of a waterproof coating system, so that the strength and viscosity of the coating system are improved. The filler powder is wrapped by a polyurethane resin system, the superfine cement and the silica fume are used as second cementing materials, and the superfine cement exposed on the surface of the coating and moisture (H) in a working surface and/or air are mixed in the coating film forming process2O) reaction hardening to form a film, wherein the superfine cement in the coating reacts with water (or moisture) permeated into the film for solidification, the particle size of the silica fume is small, the silica fume can be effectively filled between cement particles and pores of a resin three-dimensional network, gel is generated with hydration products in the pores, and the compactness and the waterproofness of the film are improved; the inorganic material curing process is combined with the curing reaction of the polyurethane resin to form an organic-inorganic composite waterproof coating, so that on one hand, the composite waterproof coating and the fiber reinforced foamed cement insulation board are addedCompatibility, the bonding force of the two is enhanced, and the coating film is not easy to fall off; on the other hand, the compatibility of the composite waterproof layer formed by the composite waterproof coating and subsequent building materials (such as external decorative materials) is improved, the bonding force of the composite waterproof layer and the subsequent building materials is enhanced, and the external construction is facilitated. During the subsequent use process of the composite waterproof layer formed by drying the coating film, if cracks are generated on the surface of the coating film or the composite waterproof layer is collided to generate defects, the exposed superfine cement and silica fume in the cracks or the defects can continuously react with the moisture in the working surface or the air, secondary hardening is carried out to form a film, the pores of the cracks or the defects are sealed, the expansion and the growth of the cracks or the defects are prevented, and therefore the waterproof effect is continuously exerted.
In the composite waterproof coating used by the invention, the hydrogenated castor oil is used as a thixotropic agent, and a hydrogen bond group is formed by hydroxyl on a chain of the hydrogenated castor oil and a carbamate group to form a thixotropic network structure, so that the system has a thixotropic effect, the inorganic filler is conveniently dispersed, and the storage stability of the system is improved. The dispersant has the function of improving the dispersibility of the inorganic powder in the system; the defoamer acts to eliminate foaming of the coating system.
Through detection, after the surface modification treatment is carried out on the fiber reinforced foamed cement insulation board by adopting the waterproof modification method, a composite waterproof layer with the thickness of 0.5-5.0mm is formed on the surface of the board. The appearance of the modified board has no cracks, unfilled corners, corner falling, layer cracks, surface oil stains and the like; the composite waterproof layer formed on the surface of the waterproof layer is small in thickness, has little influence on the size of the board, is good in appearance quality, and meets the use requirement. The composite waterproof coating used in the invention forms a thin composite waterproof layer on the surface of the plate, and has little influence on the apparent density, the heat conductivity coefficient, the non-combustible performance and the compressive strength of the plate, and has no negative influence. The water absorption rate of the system of the board obtained by the waterproof modification method is between 2.38% and 2.61%, the water absorption rate of the system is greatly reduced, and the reduction rate reaches more than 80%, because the composite waterproof layer formed by the modification treatment of the composite waterproof coating seals open holes on the surface of the board, the channel of water entering the board is blocked, the board has good waterproof and waterproof capabilities and the capacity of preventing water vapor invasion, most of water cannot enter the board, and the water absorption rate of the board is greatly reduced. In an anti-freeze-thaw cycle experiment, the temperature is maintained at-18 ℃ for 3h and at 20 ℃ for 6h as a cycle, after 50 cycles, the compression strength loss rate of the modified plate (commercial product) is 32.04%, and the strength loss is extremely high; the loss rate of the compressive strength of the board modified by the composite waterproof coating is only 14.60-15.84%, so that the strength loss is greatly reduced, and the modified board has extremely low volume water absorption, greatly reduces the damage of moisture to the interior of the board in freeze-thaw cycles, and has high strength retention rate. Experimental results show that the composite waterproof layer formed by the composite waterproof coating greatly reduces the volume water absorption of the fiber reinforced foamed cement insulation board, improves the freeze-thaw resistance cycle performance and durability of the insulation board, and prolongs the service life of the insulation board.
Detailed Description
The present invention will be further described with reference to the following embodiments.
In a specific embodiment, the polyether polyol used is composed of a commercially available polyether diol 2000D (relative molecular weight 2000, hydroxyl value 55mgKOH/g) and a polyether triol 330N (relative molecular weight 4800, hydroxyl value 35mgKOH/g), the polyether triol 330N constituting 20% of the total mass of the polyether polyol.
The superfine cement is commercially available superfine Portland cement, and has active particle size of 0.2-10 μm and water content<0.15 percent. The silica fume used is a commercial product, SiO2The content is more than or equal to 90 percent, the particle diameter of the particles is 0.1-0.5 mu m, and the specific surface area is 20-28m2Water content less than or equal to 1.0 percent per gram. The talc powder is commercially available, SiO2The content is 60%, the content of magnesium oxide is 30%, and the particle diameter is 3-10 μm.
The dispersant used was the commercially available wetting dispersant DISPER BYK-180. The defoaming agent is a commercial solvent-type system silicone defoaming agent BYK-141. The latent curing agent is a polyurethane latent curing agent ALT-101 which is commercially available.
Example 1
The surface waterproof modification method of the fiber reinforced foamed cement insulation board of the embodiment is to coat a composite waterproof coating on the surface of the fiber reinforced foamed cement insulation board to form a composite waterproof layer with the thickness of 1.0 mm;
the method specifically comprises the following steps: and (3) coating the surface (comprising the front surface, the back surface and the side edges) of the fiber reinforced foamed cement insulation board with a wetting rolling brush to wet the fiber reinforced foamed cement insulation board, then coating the composite waterproof coating, and naturally drying to form a composite waterproof layer with the thickness of 1.0 mm.
The composite waterproof coating is prepared from 4, 4' -diphenylmethane diisocyanate and the following raw materials in parts by weight: 100 parts of polyether polyol, 0.50 part of a dispersing agent, 20 parts of plasticizer dibutyl phthalate, 39 parts of superfine cement, 6 parts of silica fume, 10 parts of talcum powder, 0.6 part of hydrogenated castor oil, 0.10 part of a defoaming agent, 0.30 part of catalyst dibutyltin dilaurate, 1.0 part of a latent curing agent and 12 parts of No. 150 solvent oil; the amount of 4, 4' -diphenylmethane diisocyanate used satisfies the isocyanate index R of 1.6.
The composite waterproof coating is prepared by the following method:
1) mixing polyether polyol, a dispersing agent, a plasticizer dibutyl phthalate, talcum powder and hydrogenated castor oil according to a formula amount, stirring and dehydrating at the rotating speed of 900rpm under the vacuum condition that the temperature is 115 ℃ and the vacuum degree is not lower than 0.09MPa, cooling to 60 ℃, adding 4, 4' -diphenylmethane diisocyanate according to a calculated required amount, uniformly stirring at the rotating speed of 300rpm, heating to 90 ℃, reacting for 3 hours, cooling to 50 ℃, adding a defoaming agent, a catalyst dibutyltin dilaurate, a latent curing agent and 150# solvent oil according to the formula amount, and stirring at the rotating speed of 300rpm until the mixture is uniformly dispersed to obtain a semi-finished product;
2) adding superfine cement and silica fume with the formula amount into the semi-finished product obtained in the step 1), shearing and dispersing at a high speed of 1000rpm for 60min, and degassing for 30min under the vacuum condition that the vacuum degree is not lower than 0.09MPa to obtain the composite waterproof coating.
Example 2
The surface waterproof modification method of the fiber reinforced foamed cement insulation board of the embodiment is to coat a composite waterproof coating on the surface of the fiber reinforced foamed cement insulation board to form a composite waterproof layer with the thickness of 1.0 mm;
the method specifically comprises the following steps: and (3) coating the surface (comprising the front surface, the back surface and the side edges) of the fiber reinforced foamed cement insulation board with a wetting rolling brush to wet the fiber reinforced foamed cement insulation board, then coating the composite waterproof coating, and naturally drying to form a composite waterproof layer with the thickness of 1.0 mm.
The composite waterproof coating is prepared from 4, 4' -diphenylmethane diisocyanate and the following raw materials in parts by weight: 100 parts of polyether polyol, 0.55 part of a dispersing agent, 18 parts of plasticizer dibutyl phthalate, 40 parts of superfine cement, 5 parts of silica fume, 11 parts of talcum powder, 0.55 part of hydrogenated castor oil, 0.15 part of a defoaming agent, 0.35 part of catalyst dibutyltin dilaurate, 1.4 parts of a latent curing agent and 11 parts of No. 150 solvent oil; the amount of 4, 4' -diphenylmethane diisocyanate used satisfies the isocyanate index R ═ 1.7.
The composite waterproof coating is prepared by the following method:
1) mixing polyether polyol, a dispersing agent, a plasticizer dibutyl phthalate, talcum powder and hydrogenated castor oil according to a formula amount, stirring and dehydrating at the rotating speed of 1000rpm under the vacuum conditions that the temperature is 110 ℃ and the vacuum degree is not lower than 0.09MPa, cooling to 60 ℃, adding 4, 4' -diphenylmethane diisocyanate according to a calculated required amount, uniformly stirring at the rotating speed of 400rpm, heating to 85 ℃ for reaction for 4 hours, cooling to 50 ℃, adding a defoaming agent, a catalyst dibutyltin dilaurate, a latent curing agent and 150# solvent oil according to the formula amount, and stirring at the rotating speed of 400rpm until the mixture is uniformly dispersed to obtain a semi-finished product;
2) adding superfine cement and silica fume with the formula amount into the semi-finished product obtained in the step 1), shearing and dispersing at a high speed of 1100rpm for 50min, and removing bubbles for 25min under a vacuum condition with the vacuum degree not lower than 0.09MPa to obtain the composite waterproof coating.
Example 3
The surface waterproof modification method of the fiber reinforced foamed cement insulation board of the embodiment is to coat a composite waterproof coating on the surface of the fiber reinforced foamed cement insulation board to form a composite waterproof layer with the thickness of 1.0 mm;
the method specifically comprises the following steps: and (3) coating the surface (comprising the front surface, the back surface and the side edges) of the fiber reinforced foamed cement insulation board with a wetting rolling brush to wet the fiber reinforced foamed cement insulation board, then coating the composite waterproof coating, and naturally drying to form a composite waterproof layer with the thickness of 1.0 mm.
The composite waterproof coating is prepared from 4, 4' -diphenylmethane diisocyanate and the following raw materials in parts by weight: 100 parts of polyether polyol, 0.60 part of a dispersing agent, 18 parts of plasticizer dibutyl phthalate, 41 parts of superfine cement, 6 parts of silica fume, 12 parts of talcum powder, 0.5 part of hydrogenated castor oil, 0.20 part of a defoaming agent, 0.40 part of catalyst dibutyltin dilaurate, 1.3 parts of a latent curing agent and 10 parts of No. 150 solvent oil; the amount of 4, 4' -diphenylmethane diisocyanate used satisfies the isocyanate index R ═ 1.8.
The composite waterproof coating is prepared by the following method:
1) mixing polyether polyol, a dispersing agent, a plasticizer dibutyl phthalate, talcum powder and hydrogenated castor oil according to a formula amount, stirring and dehydrating at the rotating speed of 800rpm under the vacuum condition that the temperature is 120 ℃ and the vacuum degree is not lower than 0.085MPa, cooling to 65 ℃, adding 4, 4' -diphenylmethane diisocyanate in a required amount according to calculation, uniformly stirring at the rotating speed of 300rpm, heating to 90 ℃ for reaction for 2 hours, cooling to 55 ℃, adding a defoaming agent, a catalyst dibutyltin dilaurate, a latent curing agent and 150# solvent oil according to the formula amount, and stirring at the rotating speed of 300rpm until the materials are uniformly dispersed to obtain a semi-finished product;
2) adding superfine cement and silica fume with the formula amount into the semi-finished product obtained in the step 1), shearing and dispersing at a high speed of 1200rpm for 40min, and degassing for 20min under a vacuum condition with the vacuum degree not lower than 0.09MPa to obtain the composite waterproof coating.
The fiber reinforced foamed cement insulation boards adopted in the embodiments 1 to 3 are commercially available products, and in order to verify the effect of the above embodiments on the surface waterproof modification method, the modified boards were tested according to the requirements of JC/T2200-2013 cement-based foamed insulation boards, and the results are shown in table 1.
Comparison of Performance before and after modification of fiber-reinforced foamed Cement insulation boards in examples 1 to 3
Figure BDA0002419248320000071
As can be seen from the comparison results in table 1, after the surface modification treatment is performed on the commercially available fiber reinforced foamed cement insulation boards by using the surface modification methods of examples 1 to 3, the appearance of the modified boards is free from cracks, missing edges and corners, delamination, surface oil stains and the like; the specification (length multiplied by width multiplied by thickness) of the plate before modification is 300mm multiplied by 50mm, the composite waterproof layer (thickness 1.0mm) formed on the surface of the modified plate has little influence on the size of the plate, the size is within the allowable deviation range, the appearance quality is good, and the use requirement is met. The composite waterproof layer is very thin, so that the influence on the apparent density, the heat conductivity coefficient, the non-combustible performance and the compressive strength of the board is small, and no negative influence is caused.
The water absorption of the system of the plate (a commercial product) before modification is 13.06 percent, and the plate does not meet the standard requirement actually; the water absorption rate of the system of the board modified by the surface modification method in the embodiments 1 to 3 is between 2.38% and 2.61%, and the water absorption rate of the system is greatly reduced, and the reduction rate is more than 80%, because the composite waterproof layer formed by the modification process closes the open holes on the surface of the board, blocks the passage of water entering the board, has good waterproof and waterproof capabilities and prevents the invasion of water vapor, most of the water cannot enter the board, and thus the water absorption rate of the board is greatly reduced. In an anti-freeze-thaw cycle experiment, the temperature is kept for 3h at the temperature of 18 ℃ below zero and 6h at the temperature of 20 ℃ for one cycle, after 50 cycles, the compressive strength of the plate (a commercial product) before modification is reduced from 0.540MPa to 0.367MPa, the loss rate of the compressive strength is 32.04%, and the strength loss is extremely large; the compressive strength of the modified plate is respectively reduced from 0.544MPa, 0.541MPa and 0.543MPa to 0.461MPa, 0.462MPa and 0.457MPa, the loss rate of the compressive strength is only 14.60-15.84%, and the loss rate of the strength is greatly reduced, because the volume water absorption of the modified plate is extremely low, the damage of moisture to the interior of the plate is greatly reduced in a freeze-thaw cycle, and the strength retention rate is high.
Experimental results show that the surface waterproof modification method greatly reduces the volume water absorption of the fiber reinforced foamed cement insulation board, improves the freeze-thaw resistance cycle performance and durability of the fiber reinforced foamed cement insulation board, and prolongs the service life of the fiber reinforced foamed cement insulation board.

Claims (9)

1. A fiber reinforced foamed cement insulation board surface waterproof modification method is characterized by comprising the following steps: coating a composite waterproof coating on the surface of the fiber reinforced foamed cement insulation board to form a composite waterproof layer;
the composite waterproof coating is mainly prepared from polyisocyanate and the following raw materials in parts by weight: 100 parts of polyether polyol, 0.5-0.6 part of dispersant, 15-20 parts of plasticizer, 39-41 parts of superfine cement, 4-6 parts of silica fume, 10-12 parts of talcum powder, 0.5-0.6 part of hydrogenated castor oil, 0.1-0.2 part of defoaming agent, 0.3-0.4 part of catalyst, 1.0-1.5 parts of latent curing agent and 10-12 parts of solvent oil; the polyisocyanate is used in an amount such that the isocyanate index R is 1.6 to 1.8.
2. The fiber reinforced foamed cement insulation board surface waterproof modification method according to claim 1, characterized in that: the thickness of the composite waterproof layer is 0.5-5.0 mm.
3. The fiber reinforced foamed cement insulation board surface waterproof modification method according to claim 1, characterized in that: the coating is wet coating, namely, the surface of the fiber reinforced foamed cement insulation board is wetted by water, and then the composite waterproof coating is coated; the coating mode is spraying, brushing, knife coating or spin coating.
4. The fiber reinforced foamed cement insulation board surface waterproof modification method according to claim 1, characterized in that: the polyisocyanate is diphenylmethane diisocyanate.
5. The fiber reinforced foamed cement insulation board surface waterproof modification method according to claim 1, characterized in that: the polyether polyol consists of polyether diol 2000D and polyether triol 330N, and the polyether triol 330N accounts for 20-25% of the total mass of the polyether polyol.
6. The fiber reinforced foamed cement insulation board surface waterproof modification method according to claim 1, characterized in that: the plasticizer is dibutyl phthalate.
7. The fiber reinforced foamed cement insulation board surface waterproof modification method according to claim 1, characterized in that: the particle size of the superfine cement is 0.2-10 mu m; the particle size of the silica fume is 0.1-0.5 μm; the particle size of the talcum powder is 3-10 mu m.
8. The fiber reinforced foamed cement insulation board surface waterproof modification method according to claim 1, characterized in that: the catalyst is dibutyltin dilaurate; the solvent oil is No. 150 solvent oil.
9. The fiber reinforced foamed cement insulation board surface waterproof modification method according to claim 1, characterized in that: the composite waterproof coating is prepared by a method comprising the following steps:
1) mixing polyether polyol, a dispersing agent, a plasticizer, talcum powder and hydrogenated castor oil according to the formula amount, stirring and dehydrating at the temperature of 110-120 ℃ under a vacuum condition, then cooling to 60-65 ℃, adding polyisocyanate, stirring uniformly, heating to 85-90 ℃, reacting for 2-4h, then cooling to 50-55 ℃, adding a defoaming agent, a catalyst, a latent curing agent and solvent oil according to the formula amount, and dispersing uniformly to obtain a semi-finished product;
2) adding the superfine cement and the silica fume with the formula amount into the semi-finished product obtained in the step 1), shearing and dispersing at a high speed of 1200-1400rpm for 40-60min, and degassing for 20-30min under a vacuum condition to obtain the cement.
CN202010200639.XA 2020-03-20 2020-03-20 Waterproof modification method for surface of fiber-reinforced foamed cement insulation board Withdrawn CN111285706A (en)

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