CN110105863B - Heat-resistant primer and preparation method thereof - Google Patents

Heat-resistant primer and preparation method thereof Download PDF

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CN110105863B
CN110105863B CN201910382727.3A CN201910382727A CN110105863B CN 110105863 B CN110105863 B CN 110105863B CN 201910382727 A CN201910382727 A CN 201910382727A CN 110105863 B CN110105863 B CN 110105863B
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phosphate
component
ppg
byk
flame retardant
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CN110105863A (en
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李志士
王华进
张立国
姜清淮
王明强
赵薇
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Marine Chemical Research Institute Co Ltd
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Marine Chemical Research Institute Co Ltd
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    • C—CHEMISTRY; METALLURGY
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    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/4009—Two or more macromolecular compounds not provided for in one single group of groups C08G18/42 - C08G18/64
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    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
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    • C08G18/40—High-molecular-weight compounds
    • C08G18/62—Polymers of compounds having carbon-to-carbon double bonds
    • C08G18/6216—Polymers of alpha-beta ethylenically unsaturated carboxylic acids or of derivatives thereof
    • C08G18/622—Polymers of esters of alpha-beta ethylenically unsaturated carboxylic acids
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    • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
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    • C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
    • C08G18/75—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic
    • C08G18/751—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring
    • C08G18/752—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group
    • C08G18/753—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group
    • C08G18/755—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group and at least one isocyanate or isothiocyanate group linked to a secondary carbon atom of the cycloaliphatic ring, e.g. isophorone diisocyanate
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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
    • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
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    • C09D175/08—Polyurethanes from polyethers
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    • 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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    • 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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    • 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
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    • C09D7/60—Additives non-macromolecular
    • C09D7/63—Additives non-macromolecular organic
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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
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    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
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    • C08K2003/0812—Aluminium
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
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    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
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    • C08K3/22—Oxides; Hydroxides of metals
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    • C08K3/32—Phosphorus-containing compounds
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Abstract

The invention discloses a heat-resistant primer and a preparation method thereof, wherein the heat-resistant primer comprises the following components: the component A (weight percentage): 15-30 parts of bisphenol A epoxy resin; 0-10 parts of hydroxyl acrylate resin; 20-50% of inorganic filler; 2-5 parts of an anti-rust pigment; 2-5 parts of non-floating aluminum powder; 5-15% of a flame retardant; 0.5-2% of a dispersant; 0.1-0.5% of defoaming agent; 0.1-0.5 of a leveling agent; 20-40 parts of mixed organic solvent; the component B comprises the following components in percentage by weight: 100 parts of modified isocyanate; the weight ratio of the component A to the component B is 2.5-4: 1. the heat-resistant primer disclosed by the invention can be used in a high-temperature environment of 200 ℃ for a long time, is cured at normal temperature, has good flexibility and certain flame retardance, and can resist various solvent oils and organic solvents.

Description

Heat-resistant primer and preparation method thereof
Technical Field
The invention belongs to the field of coatings, and particularly relates to a heat-resistant primer and a preparation method thereof.
Background
The heat-resistant coating is a coating which can be used at a high temperature of more than 100 ℃ for a long time, and the coating does not change color and the performance of the coating does not lose efficacy. The heat-resistant coating is widely applied in daily life, for example, the heat-resistant coating can be industrially used in important fields of oil pipelines in the petrochemical industry, motor housings working at high temperature, power cabins, the outer surfaces of high-temperature furnace bodies, aerospace and the like; in civil use, the material can be used for electric appliance insulation, heating devices of household appliances and the like.
At present, the heat-resistant coating mainly comprises an organic silicon resin system or an organic silicon modified resin system, the heat resistance of the organic silicon coating is better, but high-temperature curing is usually needed, the construction difficulty is increased, and meanwhile, the hardness of the organic silicon system is high and the flexibility is poor.
Therefore, it is desirable to provide a new heat resistant primer and a method for preparing the same to solve the above problems.
Disclosure of Invention
The invention aims to provide a heat-resistant primer which is cured at normal temperature, good in flexibility, excellent in flame retardance and excellent in tolerance.
The invention also aims to provide a preparation method of the heat-resistant primer.
The invention relates to a heat-resistant primer which is a bi-component fireproof coating and consists of a component A and a component B, wherein the formula is as follows:
Figure BDA0002053868650000011
the content of the component B is wt%
Modified isocyanate 100
A. The proportion of the component B is 2.5: 1-4: 1.
the film-forming material can affect the physical and chemical properties of the coating such as adhesion, flexibility, medium resistance, heat resistance and the like on the base material. When selecting the film forming material, the resin is considered to meet the requirements of high and low temperature resistance, flexibility, low viscosity, proper crosslinking degree, good cohesive force and the like. The film forming material adopts a polyurethane modified epoxy resin system (a mixed system of bisphenol A type epoxy resin and/or hydroxyl acrylate resin in the component A and the component B). A preferred component A is a mixture of a bisphenol A epoxy resin (epoxy value of 0.12 to 0.56) and a hydroxy acrylate resin. The bisphenol A epoxy resin takes epoxy groups and hydroxyl groups as end groups, can react with NCO to form a cross-linked network, increases the molecular weight of a polymer, and can adjust the flexibility and strength of a film-forming material when the component B is selected from polyol, thereby meeting the actual use requirements.
The inorganic filler is one or more of talcum powder, mica powder, precipitated barium sulfate, heavy calcium, rutile titanium dioxide, fumed silica and argil. The dosage and the proportion of the inorganic filler are calculated according to the critical volume concentration (CPVC), and the upper and lower contents are not more than 10%. The inorganic filler has high oil absorption and can play a role of a thickening agent.
The antirust pigment is one or more of phosphate and zinc powder, and the phosphate antirust pigment comprises but is not limited to: zinc phosphate, molybdenum zinc phosphate and aluminum tripolyphosphate can increase the corrosion resistance of the coating.
The non-floating aluminum powder is added after being ground and dispersed in the preparation process of the coating by stirring, so that the heat dissipation of the coating can be improved, the influence on the coating under high-temperature conditions is reduced, and the heat resistance of the coating is further improved; meanwhile, according to the electrochemical mechanism of the anticorrosive paint, the non-floating aluminum powder can also improve the corrosion resistance of the primer.
Flame retardants can desorb heat to produce a non-combustible gas, decompose to produce free radicals, or other flame retardant mechanisms. The flame retardant can reduce the combustion of the coating, reduce the corresponding time of the fireproof coating and assist the carbon forming reaction of the fireproof coating. The flame retardant can comprise an organic flame retardant and/or an inorganic flame retardant, and the ratio of the amount of the organic flame retardant to the bisphenol A epoxy resin is 2: 1-0.05: 1, the proportion of the using amount of the inorganic flame retardant to the bisphenol A type epoxy resin is 0.5: 1-0.02: 1. the organic flame retardant comprises: phosphate and its derivative, phosphonate, phosphite. The phosphate ester flame retardant comprises: one or more of tricresyl phosphate, triphenyl phosphate, trimethylolpropane triacrylate, triisopropylphenyl phosphate, triethyl phosphate, tributyl phosphate, trioctyl phosphate, isopropylated triphenyl phosphate, triphenyl phosphite, cresyldiphenyl phosphate, tributoxyethyl phosphate, 1, 3, 5-pyrazolone (PMP), cresyldiphenyl phosphate, resorcinol-bis (diphenyl phosphate), bisphenol A-bis (diphenyl phosphate), resorcinol-bis [ bis (2, 6-dimethylphenyl) phosphate ]. The phosphonate ester includes: one or more of N-hydroxymethyl propionamide methylphosphonate, cyclic phosphonate, N, N-p-phenylenediamine (2-hydroxy) dibenzyl phosphonic acid tetraethyl ester and methyl phosphonic acid dimethyl ester. The inorganic flame retardant comprises: one or more of aluminum hydroxide, magnesium hydroxide, aluminum oxide, antimony trioxide, antimony pentoxide, titanium dioxide, zinc oxide, molybdenum trioxide, ammonium molybdate, ammonium dimolybdate, ammonium tetramolybdate, ammonium octamolybdate, zinc molybdate, tin oxide, cuprous oxide and expandable graphite. The aluminum hydroxide and the magnesium hydroxide are both filler type flame retardants, are halogen-free, non-toxic and smoke-inhibiting, and can generate water vapor through decomposition and heat absorption to play a role in diluting to exert flame retardant efficiency. The invention adopts a method of compounding various flame retardants to exert a synergistic flame retardant effect. Phosphate, aluminum hydroxide, and magnesium hydroxide are preferred as flame retardants.
The dispersing agent is one or more of BYK-AT203, BYK-AT204, BYK-9076, BYK-9077, BYK-P104S, BYK-ATU, BYK-103, BYK-110, BYK-142, BYK-161, BYK-162, BYK-163, BYK-164, BYK-170, BYK-180 and BYK-182 in Pico chemistry.
The defoaming agent is one or more of BYK-051, BYK-052, BYK-053, BYK-054, BYK-055, BYK-057, BYK-060, BYK-065, BYK-066N, BYK-067A, BYK-070, BYK-071, BYK-072, BYK-077, BYK-085, BYK-088, BYK-A525, BYK-A530, BYK-A535, BYK-A550, BYK-A555, BYK-A560, BYK-1752 and BYK-1790 in Pico chemistry.
The leveling agent is one or more of BYK-300, BYK-301, BYK-306, BYK-307, BYK-310, BYK-320, BYK-323, BYK-322, BYK-331, BYK-333, BYK-354, BYK-358N, BYK-361N, BYK-370, BYK-371, BYK-378 and BYK-388 which are Pico chemistry.
The mixed organic solvent is a mixed solution of xylene, butyl acetate and PMA (propylene glycol methyl ether acetate), and the weight ratio of the xylene, the butyl acetate and the PMA is 5: 3: 2 or 1: 1: 1.
the synthesis method of the modified isocyanate comprises the following steps of adding IPDI (isophorone diisocyanate) into a reaction kettle, heating to 50 ℃, and N2And (3) protecting, dropwise adding a polyol solution under stirring, keeping the temperature at 80-90 ℃ after dropwise adding is finished within 0.5-1 h, reacting for 2-3 h, measuring the NCO content, discharging, cooling to room temperature, adding butyl acetate, and adjusting the solid content to 70-80 wt% to obtain the primer modified isocyanate.
The polyol comprises one or more of polyether polyol and polyester polyol with two functionality and three functionality, wherein the polyether polyol comprises one or more of PPG-200, PPG-400, PPG-600, PPG-1000, PPG-1500, PPG-2000, PPG-3000, PPG-4000, PPG-6000 and PPG-8000. The polyester polyol comprises one or more of ethylene glycol, propylene glycol, diethylene glycol, trimethylolpropane, 1, 4-butanediol, adipic acid, sebacic acid, 1, 6-hexanediol, neopentyl glycol, 3-methyl-1, 5-pentanediol, dodecanedioic acid, isophthalic acid, azelaic acid and polycaprolactone. Preferably, the mixed liquid of 2-3 kinds of polyols, preferably, the polyol ratio is 1: (1 to 4), or 1: (1-4): (1-2).
The NCO content (mass fraction) of the isocyanate prepolymer is between 8 and 15 percent.
The preparation method of the heat-resistant primer comprises the following steps:
1. preparing a mixed organic solvent: xylene, butyl acetate and propylene glycol monomethyl ether acetate are mixed according to the weight ratio of 5: 3: 2 or 1: 1: 1, mixing;
2. preparing a component A: adding bisphenol A epoxy resin in the component A into a mixed organic solvent under stirring at the rotating speed of 600-700 r/min, adding all components except non-floating aluminum powder and an auxiliary agent after the resin is completely dispersed, grinding to the fineness of less than or equal to 45 microns by using a basket type sand mill at the rotating speed of 1900-2000 r/min, adding the auxiliary agent under stirring at the rotating speed of 600-700 r/min, filtering by using an 80-mesh filter screen, adding the ground and dispersed non-floating aluminum powder under stirring at 200-300 r/min, and uniformly dispersing to obtain the component A;
3. preparing a component B: adding IPDI into a reaction kettle, heating to 50 ℃, and N2Protection, dropwise adding a polyalcohol solution under stirring, keeping the temperature at 80-90 ℃ after dropwise adding is finished within 0.5-1 h, reacting for 2-3 h, measuring the NCO content, discharging, cooling to room temperature, adding butyl acetate, and adjusting the solid content to 70-80 wt% to obtain a component B;
before construction, A, B components in the heat-resistant primer are mixed according to the proportion of 2.5-4: 1, mixing, and then adopting a spraying, brushing and rolling method to carry out construction.
The heat-resistant primer disclosed by the invention uses a polyurethane modified epoxy resin system, can be used in a high-temperature environment of 200 ℃ for a long time, is cured at normal temperature, has good flexibility and certain flame retardance, can resist various solvent oils and organic solvents, meets the requirements of the industrial high-temperature use environment, can be matched with functional coatings such as a fireproof coating, a fireproof heat-insulating coating and the like for use, increases the adhesion of an expanded carbon layer and a base material, and ensures the fireproof performance of the fireproof coating.
The preparation method of the heat-resistant primer is simple and convenient and is easy to operate.
Detailed Description
The following examples serve to further illustrate the invention.
Example 1
Figure BDA0002053868650000041
Figure BDA0002053868650000051
The preparation method comprises the following specific steps:
1. preparing a mixed organic solvent: xylene, butyl acetate and propylene glycol monomethyl ether acetate are mixed according to the weight ratio of 5: 3: 2, mixing;
2. preparing a component A: adding 30g of bisphenol A epoxy resin (with an epoxy value of 0.51) in the component A into a mixed organic solvent under stirring AT the rotating speed of 600-700 r/min, after the resin is completely dispersed, adding 10g of mica powder, 10g of precipitated barium sulfate, 5g of rutile titanium dioxide, 5g of zinc phosphate, 2g of magnesium hydroxide, 2g of bisphenol A-bis (diphenyl phosphate) and 2g of diphenyl phosphate (except all components except floating aluminum powder and auxiliaries) to the mixed organic solvent, grinding the mixture to the fineness of less than or equal to 45 mu m AT the rotating speed of 1900-2000 r/min by using a basket type sand mill, adding 1.5g of BYK-AT203, 0.2g of BYK-051, 0.3g of BYK-310 and filtering by using an 80-mesh filter screen under stirring AT the rotating speed of 600-700 r/min, adding 2g of non-floating aluminum powder under stirring AT the rotating speed of 200-300 r/min, and uniformly dispersing to obtain the component A;
3. and B component: adding IPDI into a reaction kettle, heating to 50 ℃, and adding N2Under protection, dropwise adding a mixed solution of PPG-400 and PPG-2000 under stirring, wherein the ratio of the PPG-400 to the PPG-2000 is 1: and 2, after dropwise adding within 0.5h, keeping the temperature at 80-90 ℃ for reacting for 2.5h, measuring the NCO content, discharging, cooling to room temperature, adding butyl acetate, and adjusting the solid content to 75 wt% to obtain the component B.
A. B, the two components are as follows: 1, and mixing and using.
The paint film properties were tested as follows.
Figure BDA0002053868650000052
Figure BDA0002053868650000061
Example 2
Figure BDA0002053868650000062
1. Preparing a mixed organic solvent: xylene, butyl acetate and propylene glycol monomethyl ether acetate are mixed according to the weight ratio of 1: 1: 1, mixing;
2. preparing a component A: adding 15g of bisphenol A epoxy resin (with an epoxy value of 0.44) and 5g of hydroxy acrylate resin in the component A into a mixed organic solvent under stirring at a rotating speed of 600-700 r/min, after the resin is completely dispersed, adding 3g of rutile titanium dioxide, 12g of fumed silica, 5g of argil, 10g of talcum powder, 5g of aluminium tripolyphosphate, 5g of triphenyl phosphate, 2g of aluminum hydroxide and 1g of antimony trioxide, grinding to a fineness of less than or equal to 45 mu m by using a basket type sand mill at a rotating speed of 1900-2000 r/min, adding 1.5g of BYK-161, 0.1g of BYK-065 and 0.4g of BYK-333 under stirring at a rotating speed of 600-700 r/min, filtering by using an 80-mesh filter screen, adding 5g of non-floating aluminum powder under stirring at a rotating speed of 200-300 r/min, and uniformly dispersing to obtain the component A;
and 3, component B: adding IPDI into a reaction kettle, heating to 50 ℃, and adding N2Under protection, dropwise adding a mixed solution of PPG-200 and PPG-1000 under stirring, wherein the ratio of the PPG-200 to the PPG-1000 is 1: 4, after the dropwise addition is finished within 1 hour, the temperature is kept at 80-90 ℃ for reaction for 2.5 hours, and then the reaction is carried outAfter the NCO content is determined, discharging, cooling to room temperature, adding butyl acetate, and adjusting the solid content to 70 wt%.
A. B, mixing the two components according to the proportion of 2.5: 1, and mixing and using.
The paint film properties were tested as follows.
Numbering Test items Test results
1 Flexibility 1mm
2 Impact resistance 100cm
3 Heat resistance The coating does not bulge and fall off after being heated for 100 hours at 200 ℃, and the coating is slightly discolored after being lost of light
4 High-temperature resistant solvent oil 90d
5 Acetone-resistant wipe Reciprocating 100 times without exposing bottom
6 Flame retardancy (UL94) Class V-0
7 Limiting oxygen index LOI 32.1
8 Adhesion force 4.2MPa
Example 3
Figure BDA0002053868650000071
Figure BDA0002053868650000081
1. Preparing a mixed organic solvent: xylene, butyl acetate and propylene glycol monomethyl ether acetate are mixed according to the weight ratio of 1: 1: 1, mixing;
2. preparing a component A: adding 20g of bisphenol A epoxy resin (with an epoxy value of 0.21) and 10g of hydroxy acrylate resin in the component A into a mixed organic solvent under stirring at the rotating speed of 600-700 r/min, after the resin is completely dispersed, adding 2g of rutile titanium dioxide, 6g of triple superphosphate, 4g of argil, 8g of mica powder, 2g of zinc powder, 10g of dimethyl methylphosphonate and 2g of magnesium hydroxide, grinding to the fineness of less than or equal to 45 mu m by using a basket type sand mill at the rotating speed of 1900-2000 r/min, adding 0.5g of BYK-9076, 0.1g of BYK-053 and 0.4g of BYK-331 under stirring at the rotating speed of 600-700 r/min, filtering by using an 80-mesh filter screen, adding 2g of non-leafing aluminum powder and 2g of expandable graphite under stirring at the rotating speed of 200-300 r/min, and uniformly dispersing to obtain the component A;
and 3, component B: adding IPDI into a reaction kettle, heating to 50 ℃, and adding N2Under the protection, a mixed solution of 1, 4-butanediol, PPG-1500 and diethylene glycol is dripped under stirring, and the proportion of the 1, 4-butanediol, the PPG-1500 and the diethylene glycol is as follows: 4: after the dropwise addition is finished within 2, 1h, keepingReacting at 80-90 ℃ for 2.5h, measuring the NCO content, discharging, cooling to room temperature, adding butyl acetate, and adjusting the solid content to 70 wt%.
A. B, mixing the two components according to the proportion of 3.5: 1, and mixing and using.
The paint film properties were tested as follows.
Numbering Test items Test results
1 Flexibility 1mm
2 Impact resistance 100cm
3 Heat resistance At 200 ℃ for 120h, the coating does not bulge and fall off, and the color of the coating is slightly changed after light loss
4 High-temperature resistant solvent oil 90d
5 Acetone-resistant wipe Reciprocating 100 times without exposing bottom
6 Flame retardancy (UL94) Class V-0
7 Limiting oxygen index LOI 29.6
8 Adhesion force 3.9MPa
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.

Claims (4)

1. A heat-resistant primer is characterized by comprising the following components:
Figure FDA0002662068500000011
the weight ratio of the component A to the component B is 2.5-4: 1;
the synthesis method of the modified isocyanate comprises the following steps: adding isophorone diisocyanate into a reaction kettle, heating to 50 ℃, and N2Protection, dropwise adding a polyalcohol solution under stirring, keeping the temperature at 80-90 ℃ after dropwise adding is finished within 0.5-1 h, reacting for 2-3 h, measuring the NCO content, discharging, cooling to room temperature, adding butyl acetate, and adjusting the solid content to 70-80 wt%; the polyol solution comprises 2-3 bifunctional and trifunctional polyether polyols and polyester polyols;
the polyether polyol is one or more of PPG-200, PPG-400, PPG-600, PPG-1000, PPG-1500, PPG-2000, PPG-3000, PPG-4000, PPG-6000 and PPG-8000; when the polyol solution is a mixture of two polyols, the weight ratio of the two polyols is 1: (1-4); when the polyol solution is a mixture of three polyols, the weight ratio of the three polyols is 1: (1-4): (1-2);
the flame retardant comprises an organic flame retardant and an inorganic flame retardant, wherein the weight ratio of the organic flame retardant to the bisphenol A epoxy resin is (0.05-2): 1, the weight ratio of the inorganic flame retardant to the bisphenol A epoxy resin is 0.02-0.5: 1; the organic flame retardant is phosphate; the inorganic flame retardant is aluminum hydroxide and magnesium hydroxide;
the epoxy value of the bisphenol A type epoxy resin is 0.12-0.56; the inorganic filler is one or more of talcum powder, mica powder, precipitated barium sulfate, heavy calcium, rutile titanium dioxide, fumed silica and argil; the antirust pigment is one or more of phosphate and zinc powder; the phosphate is zinc phosphate, aluminum phosphate, molybdenum zinc phosphate and aluminum tripolyphosphate.
2. The heat resistant primer according to claim 1, wherein the phosphate ester comprises: one or more of tricresyl phosphate, triphenyl phosphate, triisopropylphenyl phosphate, triethyl phosphate, tributyl phosphate, trioctyl phosphate, isopropylated triphenyl phosphate, triphenyl phosphite, cresyldiphenyl phosphate, tributoxyethyl phosphate, cresyldiphenyl phosphate, resorcinol-bis (diphenyl phosphate), bisphenol a-bis (diphenyl phosphate), and resorcinol-bis [ bis (2, 6-dimethylphenyl) phosphate ].
3. The heat-resistant primer according to claim 1, wherein the mixed organic solvent is a mixed solution of xylene, butyl acetate and propylene glycol methyl ether acetate, and the weight ratio of the xylene, the butyl acetate and the propylene glycol methyl ether acetate is 5: 3: 2 or 1: 1: 1.
4. a method of preparing a heat resistant primer according to claim 1, comprising the steps of:
(1) preparing a mixed organic solvent: xylene, butyl acetate and propylene glycol monomethyl ether acetate are mixed according to the weight ratio of 5: 3: 2 or 1: 1: 1, mixing;
(2) preparing a component A: adding bisphenol A epoxy resin in the component A into a mixed organic solvent under stirring at the rotating speed of 600-700 r/min, adding all components except non-floating aluminum powder and an auxiliary agent after the resin is completely dispersed, grinding to the fineness of less than or equal to 45 microns by using a basket type sand mill at the rotating speed of 1900-2000 r/min, adding the auxiliary agent under stirring at the rotating speed of 600-700 r/min, filtering by using an 80-mesh filter screen, adding the ground and dispersed non-floating aluminum powder under stirring at 200-300 r/min, and uniformly dispersing to obtain the component A;
(3) preparing a component B: adding isophorone diisocyanate into a reaction kettle, heating to 50 ℃, and N2And (3) protecting, dropwise adding the polyalcohol solution under stirring, keeping the temperature at 80-90 ℃ after dropwise adding is finished within 0.5-1 h, reacting for 2-3 h, measuring the NCO content, discharging, cooling to room temperature, adding butyl acetate, and adjusting the solid content to 70-80 wt% to obtain a component B.
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