CN111548712B - Quickly-cured building polyurea explosion-proof coating and preparation method thereof - Google Patents

Quickly-cured building polyurea explosion-proof coating and preparation method thereof Download PDF

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CN111548712B
CN111548712B CN202010473194.2A CN202010473194A CN111548712B CN 111548712 B CN111548712 B CN 111548712B CN 202010473194 A CN202010473194 A CN 202010473194A CN 111548712 B CN111548712 B CN 111548712B
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parts
component
amino
titanium dioxide
stirring
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CN111548712A (en
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吴显鹏
陶佳栋
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Shengli New Big New Materials Co ltd
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Shandong Xinnuo New Materials Co ltd
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    • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/02—Polyureas
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Abstract

The invention belongs to the technical field of explosion-proof coatings, and particularly discloses a rapidly-cured polyurea explosion-proof coating for buildings and a preparation method thereof, wherein the coating comprises a component A and a component B, the component A comprises, by weight, 15-70 parts of polyether polyol, 15-65 parts of isocyanate, 1-15 parts of modified nano titanium dioxide and 0-10 parts of a diluent, and the component B comprises 45-65 parts of amino-terminated polyether, 20-30 parts of a chain extender, 3-10 parts of a flame retardant, 1-5 parts of amino silicone oil and 4-15 parts of an auxiliary agent and an additive. On the premise of ensuring that the paint has excellent safety protection performance, the tear strength and the curing speed of the product are improved, so that a smooth coating is obtained when the paint is constructed on any curved surface, top surface and vertical wall surface, and the sagging phenomenon is not generated, thereby meeting the requirement of construction on any wall surface of a building under different environments.

Description

Quickly-cured building polyurea explosion-proof coating and preparation method thereof
Technical Field
The invention relates to the technical field of explosion-proof coatings, in particular to a fast-curing polyurea explosion-proof coating for buildings and a preparation method thereof.
Background
With the requirement of domestic safety and environmental protection policies, the application prospect of the explosion-proof coating in the building field is wide, and the polyurea elastomer (abbreviated as polyurea) is used as the main component of the explosion-proof coating. When the polyurea explosion-proof coating is used as a coating, the polyurea explosion-proof coating has good performance in both the construction process and the use process, and is widely applied to the water resistance and heavy corrosion resistance of chemical equipment, high-speed rails, bridges and marine equipment at present.
Although the polyurea explosion-proof coating has good performance, in order to meet certain demanding use requirements, the mechanical and other performances of the coating are considered, and meanwhile, the polyurea explosion-proof coating is rapidly cured so as to meet the construction of any wall surface of a building under different environments, and the common polyurea coating cannot meet the requirements, needs to be modified, and further improves the related performance.
The existing preparation and modification of the polyurea explosion-proof coating mostly adopt a mode of adding fillers, the curing speed is high, the adhesion force of the coating and a base material is easy to be poor, the mechanical property can be influenced to a certain extent, such as the tearing strength, and the tearing strength is an important index for inspecting the polyurea explosion-proof coating.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide an explosion-proof building polyurea explosion-proof coating capable of being rapidly cured, and a preparation method thereof, wherein the mechanical and other properties of the coating can be taken into consideration, the rapid curing is realized, and the good adhesive force of the coating is kept, so that the construction on any wall surface of a building under different environments is met.
In order to achieve the above purpose and other related purposes, the invention provides an explosion-proof rapidly-cured polyurea explosion-proof coating for buildings in a first aspect, which comprises a component A and a component B, wherein the component A comprises, by weight, 15-70 parts of polyether polyol, 15-65 parts of isocyanate, 1-15 parts of modified nano titanium dioxide and 0-10 parts of a diluent, and the component B comprises 45-65 parts of amino-terminated polyether, 20-30 parts of a chain extender, 3-10 parts of a flame retardant, 1-5 parts of amino silicone oil and 4-15 parts of an auxiliary agent and an additive.
Optionally, when the paint is used, the weight ratio of the component A to the component B is 1.5-1: 1.
Optionally, the component B further comprises 1-5 parts of graphene.
Optionally, in the component A, the polyether polyol is at least one selected from polytetrahydrofuran ether glycol, 1, 4-butanediol, polyoxypropylene ether polyol, polybutadiene polyol, polypropylene glycol ether, fatty acid triglyceride, polycaprolactone glycol, tetrabromophthalate glycol and organic phosphate glycol.
Optionally, in the component a, the isocyanate is selected from at least one of diphenylmethane diisocyanate, 1,4 cyclohexane diisocyanate, polymethylene phenyl polyisocyanate, hexamethylene diisocyanate, and isophorone diisocyanate.
Optionally, the preparation method of the modified nano titanium dioxide comprises the following steps: adding polyethylene glycol and nano titanium dioxide into water, adjusting the pH value to 4-5, stirring, performing ultrasonic dispersion to obtain a nano titanium dioxide dispersion solution, then adding a silane coupling agent, adjusting the pH value to 4-5, stirring, performing centrifugal separation, taking the precipitate, re-dispersing the precipitate into the water, performing ultrasonic treatment, performing centrifugal separation, removing excessive silane coupling agent, repeating the operation for two times or more, drying, and performing vacuum cooling to obtain modified nano titanium dioxide powder.
Preferably, in the preparation method of the modified nano titanium dioxide, the stirring time is 0.5-2h, and the ultrasonic dispersion time is 0.5-1.5 h.
Preferably, the silane coupling agent is a gamma-ureidopropyltriethoxysilane coupling agent.
Optionally, in the component a, the diluent is at least one selected from the group consisting of toluene-diphenyl phosphate, 2-ethylhexyl diphenyl carbonate, propylene carbonate, ethyl carbonate, dibutyl phthalate, 2-chloroethyl ester, and acetone.
Optionally, in the component B, the amino-terminated polyether is a primary-secondary amino-terminated polyalkylene oxide compound, the molecular weight of the amino-terminated polyether is 500-5000, and the functionality is 2-3; preferably, the amino-terminated polyether is at least one selected from the group consisting of amino-terminated polyether T5000, amino-terminated polyether D2000, amino-terminated polyether D230, and amino-terminated polyether D400.
Optionally, in the component B, the chain extender is at least one selected from diethyltoluenediamine, dimethylthiotoluenediamine, N-dialkylmethyldiamine, N-dialkylphenylenediamine, and isophoronediamine.
Optionally, in the component B, the flame retardant is selected from at least one of tributyl phosphate, triphenyl phosphate, trichlorobromomethane, tris (2-chloroethyl) phosphate, tris (2-chloroisopropyl) phosphate, dimethyl methyl phosphate, antimony trioxide, ammonium polyphosphate, pentabromodiphenyl ether, aluminum hydroxide, dibromomethane and dichlorobromomethane.
Optionally, in the component B, the auxiliary agent includes an ultraviolet absorber and a dispersant, and the additive includes carbon nanotubes and a pigment.
Optionally, the ultraviolet absorbent is at least one selected from phenyl ortho-hydroxybenzoate, 2, 4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, hexamethylphosphoric triamide, and 2- (2 '-hydroxy-5' -methylphenyl) benzotriazole.
Optionally, the dispersant is selected from at least one of sodium oleate, sodium sulfate, fatty acid polyglycol ester, triethyl hexyl phosphoric acid.
Optionally, the pigment is selected from at least one of silica powder, carbon black and titanium dioxide.
The second aspect of the invention provides a preparation method of the polyurea explosion-proof coating for buildings, which comprises the following steps:
(1) preparing a component A: adding polyether glycol into a reaction kettle, dehydrating for 1-3h at 90-100 ℃, adding modified nano titanium dioxide, stirring for 0.5-2h at 70-90 ℃, adding isocyanate and/or diluent, reacting for 1-4h at 70-90 ℃, cooling after uniformly stirring, and discharging to obtain a component A;
(2) preparing a component B: adding the amino-terminated polyether, the auxiliary agent and the additive into a reaction kettle, stirring and heating to 70-90 ℃, continuing stirring for 2-4h, adding the chain extender, the flame retardant, the amino silicone oil and/or the graphene, and continuing stirring for 2-3h to obtain the component B.
Optionally, in the step (1), the preparation method of the modified nano titanium dioxide comprises: adding polyethylene glycol and nano titanium dioxide into water, adjusting the pH value to 4-5, stirring, performing ultrasonic dispersion to obtain a nano titanium dioxide dispersion solution, then adding a silane coupling agent, adjusting the pH value to 4-5, stirring, performing centrifugal separation, taking the precipitate, re-dispersing the precipitate into the water, performing ultrasonic treatment, performing centrifugal separation, removing excessive silane coupling agent, repeating the operation for two times or more, drying, and performing vacuum cooling to obtain modified nano titanium dioxide powder.
Preferably, in the preparation method of the modified nano titanium dioxide, the stirring time is 0.5-2h, and the ultrasonic dispersion time is 0.5-1.5 h.
Preferably, the silane coupling agent is a gamma-ureidopropyltriethoxysilane coupling agent.
As mentioned above, the polyurea explosion-proof coating for buildings and the preparation method thereof have the following beneficial effects:
the invention provides a novel polyurea explosion-proof coating for buildings, which can improve the tearing strength and the curing speed of a product on the premise of ensuring the excellent safety protection performance of the coating, so that the coating can be constructed on any curved surface, top surface and vertical wall surface to obtain a flat coating without sagging phenomenon.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
The invention provides a fast-curing building polyurea explosion-proof coating which comprises a component A and a component B, wherein the component A comprises, by weight, 15-70 parts of polyether polyol, 15-65 parts of isocyanate, 1-15 parts of modified nano titanium dioxide and 0-10 parts of diluent, and the component B comprises 45-65 parts of amino-terminated polyether, 20-30 parts of chain extender, 3-10 parts of flame retardant, 1-5 parts of amino silicone oil and 4-15 parts of auxiliary agent and additive.
When the paint is used, the weight ratio of the component A to the component B is 1.5-1: 1.
And the component B also comprises 1-5 parts of graphene.
In the component A, polyether polyol is selected from at least one of polytetrahydrofuran ether glycol, 1, 4-butanediol, polyoxypropylene ether polyol, polybutadiene polyol, polypropylene glycol ether, fatty acid triglyceride, polycaprolactone glycol, tetrabromophthalate glycol and organic phosphate glycol. The polyether polyols in the following examples are selected from polytetrahydrofuran ether glycol, 1, 4-butanediol, polybutadiene polyol, polypropylene glycol ether, fatty acid triglyceride, polycaprolactone diol and tetrabromophthalate diol, and polyurea explosion-proof coatings prepared from other polyether polyols (polyoxypropylene ether polyol and organic phosphate ester diol) also have the same or similar performance.
In the component A, isocyanate is selected from at least one of diphenylmethane diisocyanate, 1,4 cyclohexane diisocyanate, polymethylene phenyl polyisocyanate, hexamethylene diisocyanate and isophorone diisocyanate.
In the component A, the diluent is selected from at least one of toluene-diphenyl phosphate, 2-ethylhexyl diphenyl ester, propylene carbonate, ethyl carbonate, dibutyl phthalate, 2-chloroethyl ester and acetone. The diluent in the following examples is selected from toluene-diphenyl phosphate, 2-ethylhexyl diphenyl phosphate and acetone, and polyurea explosion-proof coatings prepared by adopting other types of diluents (propylene carbonate, ethyl carbonate, dibutyl phthalate and 2-chloroethyl ester) also have the same or similar performance.
In the component B, the amino-terminated polyether is a primary-secondary amino-terminated polyalkylene oxide compound, the molecular weight of the amino-terminated polyether is 500-5000, and the functionality is 2-3; preferably, the amino-terminated polyether is at least one selected from the group consisting of amino-terminated polyether T5000, amino-terminated polyether D2000, amino-terminated polyether D230, and amino-terminated polyether D400.
In the component B, the chain extender is selected from at least one of diethyltoluenediamine, dimethylthiotoluenediamine, N-dialkyl-methyl diamine, N-dialkyl-phenylenediamine and isophorone diamine. The chain extenders in the following examples are selected from diethyltoluenediamine, dimethylthiotoluenediamine, and polyurea explosion-proof coatings prepared by using other chain extenders (N, N-dialkyl methyl diamine, N-dialkyl phenylenediamine, isophorone diamine) also have the same or similar performance.
In the component B, the flame retardant is selected from at least one of tributyl phosphate, triphenyl phosphate, trichlorobromomethane, tris (2-chloroethyl) phosphate, tris (2-chloroisopropyl) phosphate, dimethyl methyl phosphate, antimony trioxide, ammonium polyphosphate, pentabromodiphenyl ether, aluminum hydroxide, dibromomethane and dichlorobromomethane. The following examples select tributyl phosphate, trichlorobromomethane, ammonium polyphosphate, aluminum hydroxide, dibromomethane, dichlorobromomethane as flame retardants, and polyurea explosion-proof coatings prepared from other flame retardants (triphenyl phosphate, tris (2-chloroethyl) phosphate, tris (2-chloroisopropyl) phosphate, dimethyl methylphosphonate, antimony trioxide, pentabromodiphenyl ether) also have the same or similar properties.
In the component B, the auxiliary agent comprises an ultraviolet absorbent and a dispersing agent, and the additive comprises carbon nano tubes and a pigment.
Wherein the ultraviolet absorbent is at least one selected from phenyl ortho-hydroxybenzoate, 2, 4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, hexamethylphosphoric triamide and 2- (2 '-hydroxy-5' -methylphenyl) benzotriazole. Phenyl o-hydroxybenzoate and 2, 4-dihydroxybenzophenone are selected as the ultraviolet absorbers in the following examples, and polyurea explosion-proof paint prepared by adopting other ultraviolet absorbers (2-hydroxy-4-methoxybenzophenone, hexamethylphosphoric triamide and 2- (2 '-hydroxy-5' -methylphenyl) benzotriazole) also has the same or similar performance.
Wherein the dispersant is at least one selected from sodium oleate, sodium sulfate, fatty acid polyglycol ester and triethylhexyl phosphoric acid. Sodium oleate and sodium sulfate are selected as the dispersing agents in the following examples, and the polyurea explosion-proof coating prepared by adopting other dispersing agents (fatty acid polyglycol ester and triethylhexylphosphoric acid) also has the same or similar performance.
Wherein the pigment is selected from at least one of silica powder, carbon black and titanium dioxide.
The modified nano titanium dioxide is prepared by adopting nano titanium dioxide powder produced by combined fertilizer Zhonghang nanotechnology development Limited company through autonomous surface modification treatment, and the specific preparation method is as follows:
adding a certain amount of polyethylene glycol-400 and nano titanium dioxide powder into deionized water, adjusting the pH to 4-5 by using sodium hydroxide and hydrochloric acid, stirring for 0.5-1.5h, and performing ultrasonic dispersion for 0.5-1.5h to obtain nano titanium dioxide dispersion liquid; and then adding a gamma-ureidopropyltriethoxysilane coupling agent, adjusting the pH value to 4-5, stirring for 1-2h at 50-70 ℃, then centrifugally separating, taking the precipitate, re-dispersing the precipitate into deionized water, ultrasonically treating for 0.5-1h, centrifugally separating, removing the excess silane coupling agent, repeating the operation for three times, drying for 24-48h at 95-103 ℃, and cooling in vacuum for 2-3h to obtain the modified nano titanium dioxide powder.
Example 1
A quick-curing building polyurea explosion-proof coating comprises the following raw materials in parts by weight:
the component A comprises: 46 parts of polytetrahydrofuran ether glycol, 24 parts of 1, 4-butanediol, 15 parts of hexamethylene diisocyanate, 8 parts of modified nano titanium dioxide and 8 parts of acetone;
and B component: 15 parts of amino-terminated polyether T5000, 35 parts of amino-terminated polyether D2000, 10 parts of amino-terminated polyether D230, 30 parts of diethyltoluenediamine, 3 parts of dibromomethane, 2 parts of amino silicone oil, 1 part of graphene, 1 part of sodium oleate and 2 parts of titanium dioxide.
The preparation method comprises the following steps:
(1) preparing a component A: adding polytetrahydrofuran ether diol and 1, 4-butanediol into a reaction kettle, dehydrating for 2h at 100 ℃, adding modified nano titanium dioxide, stirring for 0.5h at 90 ℃, adding hexamethylene diisocyanate, reacting for 1h at 90 ℃, cooling after uniformly stirring, and discharging to obtain the component A.
(2) Preparing a component B: adding amino-terminated polyether T5000, amino-terminated polyether D2000, amino-terminated polyether D230 sodium oleate and sodium oleate into a reaction kettle, stirring, heating to 90 ℃, continuing stirring for 3 hours, adding diethyltoluenediamine, dibromomethane, amino-silicone oil and graphene, and continuing stirring for 3 hours to obtain a component B.
The coating is prepared by spraying and manufacturing a Kyowa park brand JHPK-BPT1 spraying device according to the ratio of A to B to 1.
Example 2
A quick-curing building polyurea explosion-proof coating comprises the following raw materials in parts by weight:
and (2) component A: 42 parts of polytetrahydrofuran ether glycol, 28 parts of polybutadiene polyol, 16 parts of polymethylene phenyl polyisocyanate, 4 parts of modified nano titanium dioxide, 7 parts of toluene-diphenyl phosphate and 3 parts of acetone;
and B component: 10 parts of amino-terminated polyether T5000, 30 parts of amino-terminated polyether D2000, 20 parts of amino-terminated polyether D400, 30 parts of diethyl toluene diamine, 2 parts of amino silicone oil, 2 parts of trichlorobromomethane, 1 part of titanium dioxide, 2 parts of graphene and 2 parts of 2, 4-dihydroxy benzophenone.
The preparation method comprises the following steps:
(1) preparing a component A: adding polytetrahydrofuran ether glycol and polybutadiene polyol into a reaction kettle, dehydrating for 3h at 90 ℃, adding modified nano titanium dioxide, stirring for 2h at 70 ℃, adding polymethylene phenyl polyisocyanate, reacting for 4h at 70 ℃, cooling after uniformly stirring, and discharging to obtain the component A.
(2) Preparing a component B: adding the amino-terminated polyether T5000, the amino-terminated polyether D2000, the amino-terminated polyether D400, titanium dioxide and 2, 4-dihydroxy benzophenone into a reaction kettle, stirring and heating to 70 ℃, continuing to stir for 4 hours, adding diethyltoluenediamine, trichlorobromomethane, amino silicone oil and graphene, and continuing to stir for 3 hours to obtain a component B.
The coating is prepared by spraying and manufacturing a Kyowa park brand JHPK-BPT1 spraying device according to the proportion of A to B to 1.5 to 1.
Example 3
A quick-curing building polyurea explosion-proof coating comprises the following raw materials in parts by weight:
the component A comprises: 36 parts of polybutadiene polyol, 34 parts of polycaprolactone diol, 18 parts of isophorone diisocyanate, 6 parts of modified nano titanium dioxide, 8 parts of 2-ethylhexyl diphenyl ester and 4 parts of acetone;
and B component: 10 parts of amino-terminated polyether T5000, 40 parts of amino-terminated polyether D2000, 5 parts of amino-terminated polyether D230, 35 parts of diethyl toluene diamine, 4 parts of amino silicone oil, 6 parts of dichlorobromomethane, 2 parts of titanium dioxide, 3 parts of graphene and 2 parts of phenyl o-hydroxybenzoate.
The preparation method comprises the following steps:
(1) preparing a component A: adding polybutadiene polyol and polycaprolactone diol into a reaction kettle, dehydrating for 2h at 100 ℃, adding modified nano titanium dioxide, stirring for 1h at 80 ℃, adding isophorone diisocyanate, reacting for 2h at 80 ℃, uniformly stirring, cooling, and discharging to obtain the component A.
(2) Preparing a component B: adding amino-terminated polyether T5000, amino-terminated polyether D2000, amino-terminated polyether D230, phenyl o-hydroxybenzoate and titanium dioxide into a reaction kettle, stirring and heating to 70-90 ℃, continuing to stir for 2-4h, adding diethyltoluenediamine, dichlorobromomethane, amino-silicone oil and graphene, and continuing to stir for 2-3h to obtain a component B.
The coating is prepared by spraying and manufacturing a Kyowa park brand JHPK-BPT1 spraying device according to the proportion of A to B to 1.5 to 1.
Example 4
A quick-curing building polyurea explosion-proof coating comprises the following raw materials in parts by weight:
the component A comprises: 35 parts of polytetrahydrofuran ether glycol, 25 parts of polypropylene glycol ether, 20 parts of hexamethylene diisocyanate, 30 parts of diphenylmethane diisocyanate, 15 parts of modified nano titanium dioxide and 8 parts of acetone;
and B component: 15 parts of amino-terminated polyether T5000, 25 parts of amino-terminated polyether D2000, 10 parts of amino-terminated polyether D230, 25 parts of diethyl methyl diamine, 8 parts of ammonium polyphosphate, 3 parts of amino silicone oil, 5 parts of graphene, 1 part of sodium sulfate, 2 parts of titanium dioxide and 2 parts of silica micropowder.
The preparation method comprises the following steps:
(1) preparing a component A: adding polytetrahydrofuran ether glycol and polypropylene glycol ether into a reaction kettle, dehydrating for 3h at 90 ℃, adding modified nano titanium dioxide, stirring for 0.5h at 90 ℃, adding isocyanate, reacting for 2h at 90 ℃, uniformly stirring, cooling, and discharging to obtain the component A.
(2) Preparing a component B: adding the amino-terminated polyether T5000, the amino-terminated polyether D2000, the amino-terminated polyether D230, sodium sulfate, titanium dioxide and silica micro-stone powder into a reaction kettle, stirring and heating to 90 ℃, continuing stirring for 2 hours, adding diethyl methyl diamine, ammonium polyphosphate, amino silicone oil and graphene, and continuing stirring for 2 hours to obtain a component B.
The coating is prepared by spraying and manufacturing a Kyowa park brand JHPK-BPT1 spraying device according to the proportion of A to B to 1.2 to 1.
Example 5
A quick-curing building polyurea explosion-proof coating comprises the following raw materials in parts by weight:
the component A comprises: 35 parts of polytetrahydrofuran ether glycol, 25 parts of fatty acid triglyceride, 30 parts of 1,4 cyclohexane diisocyanate, 10 parts of modified nano titanium dioxide and 6 parts of acetone;
and B component: 15 parts of amino-terminated polyether T5000, 30 parts of amino-terminated polyether D2000, 20 parts of dimethyl-thio toluene diamine, 10 parts of tributyl phosphate, 1 part of amino silicone oil, 3 parts of graphene, 1 part of sodium oleate, 3 parts of titanium dioxide and 1 part of silica micropowder.
The preparation method comprises the following steps:
(1) preparing a component A: adding polytetrahydrofuran ether glycol and fatty acid triglyceride into a reaction kettle, dehydrating for 2h at 100 ℃, adding modified nano titanium dioxide, stirring for 2h at 80 ℃, adding 1,4 cyclohexane diisocyanate and acetone, reacting for 2h at 90 ℃, cooling after uniformly stirring, and discharging to obtain the component A.
(2) Preparing a component B: adding the amino-terminated polyether T5000, the amino-terminated polyether D2000, sodium oleate, titanium dioxide, silica flour, an auxiliary agent and an additive into a reaction kettle, stirring, heating to 70 ℃, continuing stirring for 4 hours, adding dimethylthio toluenediamine, tributyl phosphate, amino silicone oil and graphene, and continuing stirring for 3 hours to obtain a component B.
The coating is prepared by spraying and manufacturing a Kyowa park brand JHPK-BPT1 spraying device according to the ratio of A to B to 1.
Example 6
A quick-curing building polyurea explosion-proof coating comprises the following raw materials in parts by weight:
the component A comprises: 35 parts of polytetrahydrofuran ether glycol, 25 parts of polybutadiene polyol, 10 parts of hexamethylene diisocyanate, 10 parts of diphenylmethane diisocyanate, 12 parts of modified nano titanium dioxide and 10 parts of acetone;
and B component: 25 parts of amino-terminated polyether T5000, 25 parts of amino-terminated polyether D230, 30 parts of diethyltoluenediamine, 5 parts of aluminum hydroxide, 5 parts of amino silicone oil, 1 part of sodium oleate and 2 parts of titanium dioxide.
The preparation method comprises the following steps:
(1) preparing a component A: adding polytetrahydrofuran ether glycol and polybutadiene polyol into a reaction kettle, dehydrating for 3 hours at the temperature of 90 ℃, adding modified nano titanium dioxide, stirring for 0.5-2 hours at the temperature of 80 ℃, adding hexamethylene diisocyanate, reacting for 3 hours at the temperature of 80 ℃, uniformly stirring, cooling, and discharging to obtain the component A.
(2) Preparing a component B: adding the amino-terminated polyether T5000, the amino-terminated polyether D230, sodium oleate and titanium dioxide into a reaction kettle, stirring, heating to 80 ℃, continuing stirring for 3 hours, adding diethyltoluenediamine, aluminum hydroxide and amino silicone oil, and continuing stirring for 3 hours to obtain a component B.
The coating is prepared by spraying and manufacturing a Kyowa park brand JHPK-BPT1 spraying device according to the proportion of A to B to 1.4 to 1.
Comparative example 1
The composition, preparation and application of the coating in this comparative example were the same as in example 1, except that the modified nano-titania was not included.
Comparative example 2
The coating composition, preparation and application method in this comparative example are the same as in example 1, except that the purchased nano titanium dioxide (composite fertilizer medium navigation nano) is directly used.
Comparative example 3
The coating composition, preparation and use methods in this comparative example were the same as example 1, except that graphene was not included.
Comparative example 4
The coating composition, preparation and application method in this comparative example were the same as example 1, except that the amino silicone oil was not included.
Comparative example 5
The composition, preparation and application methods of the coating in this comparative example were the same as in example 1, except that modified nano titanium dioxide, graphene and amino silicone oil were not included.
The coatings of examples 1 to 6 and comparative examples 1 to 5 were sprayed on a ground iron plate, respectively, to a thickness of 2mm, and the properties were tested, and the surface dry time measurement was carried out in accordance with the regulations of GB/T23446-2009 spray polyurea waterproofing coating, the adhesion measurement was carried out in accordance with the regulations of GB/T1720 spray polyurea waterproofing coating, and the hardness and tensile strength measurements were carried out in accordance with the regulations of GB/T23446-2009 spray polyurea waterproofing coating; the tear strength was determined according to method B of GB/T529-. After a plurality of tests, the time for the coating to reach the optimal mechanical strength is obtained, and the results are shown in table 1, and the data of table 1 shows the time for the adhesion, hardness, tensile strength and tear strength to reach the optimal mechanical strength.
TABLE 1
Figure GDA0003633950180000091
The experimental data show that the performances of the coatings of the embodiments 1 to 6 are obviously superior to those of the coatings of the comparative examples 1 to 5, which shows that after the modified nano titanium dioxide, the graphene and the amino silicone oil are added, the curing speed of the coatings is high, the time for reaching the optimal mechanical strength is prolonged to 4 to 5 days, the adhesion is good, the tensile strength and the tear strength are high, and the use requirements are completely met.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims (3)

1. The quick-curing building polyurea explosion-proof coating is characterized by comprising a component A and a component B, wherein the component A comprises the following raw materials in parts by weight: 15-70 parts of polyether polyol, 15-65 parts of isocyanate, 1-15 parts of modified nano titanium dioxide and 0-10 parts of diluent, wherein the component B comprises the following raw materials: 45-65 parts of amino-terminated polyether, 20-30 parts of chain extender, 3-10 parts of flame retardant, 1-5 parts of amino silicone oil, 1-5 parts of graphene and 4-15 parts of auxiliary agent and additive;
when the adhesive is used, the weight ratio of the component A to the component B is 1.5-1: 1;
the polyether polyol is selected from at least one of polytetrahydrofuran ether glycol and polyoxypropylene ether polyol;
the isocyanate is at least one of diphenylmethane diisocyanate, 1, 4-cyclohexane diisocyanate, hexamethylene diisocyanate and isophorone diisocyanate;
the preparation method of the modified nano titanium dioxide comprises the following steps: adding polyethylene glycol-400 and nano titanium dioxide powder into deionized water, adjusting pH to 4-5 with sodium hydroxide and hydrochloric acid, stirring for 0.5-1.5h, and ultrasonically dispersing for 0.5-1.5h to obtain nano titanium dioxide dispersion liquid; then adding gamma-ureidopropyltriethoxysilane coupling agent, adjusting pH to 4-5, stirring for 1-2h at 50-70 ℃, then centrifugally separating, taking precipitate, re-dispersing the precipitate into deionized water, ultrasonically treating for 0.5-1h, centrifugally separating, removing excessive silane coupling agent, repeating the operation for three times, drying for 24-48h at 95-103 ℃, and cooling in vacuum for 2-3h to obtain modified nano titanium dioxide powder;
the diluent is at least one selected from propylene carbonate, ethyl carbonate, dibutyl phthalate and acetone;
the amino-terminated polyether is at least one selected from amino-terminated polyether T5000, amino-terminated polyether D2000, amino-terminated polyether D230 and amino-terminated polyether D400;
the chain extender is at least one selected from diethyl toluene diamine, dimethyl sulfur toluene diamine, N-dialkyl methyl diamine, N-dialkyl benzene diamine and isophorone diamine;
the flame retardant is selected from at least one of tributyl phosphate, triphenyl phosphate, trichlorobromomethane, tris (2-chloroethyl) phosphate, tris (2-chloroisopropyl) phosphate, dimethyl methyl phosphonate, antimony trioxide, ammonium polyphosphate, pentabromodiphenyl ether, aluminum hydroxide, dibromomethane and dichlorobromomethane;
in the component B, the auxiliary agent is an ultraviolet absorbent and a dispersing agent, and the additive is a carbon nano tube and a pigment; the ultraviolet absorbent is at least one selected from phenyl ortho-hydroxybenzoate, 2, 4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone and 2- (2 '-hydroxy-5' -methylphenyl) benzotriazole; the dispersant is selected from at least one of sodium oleate, sodium sulfate, fatty acid polyglycol ester and triethylhexyl phosphoric acid;
the preparation method of the coating comprises the following steps:
(1) preparing a component A: adding polyether glycol into a reaction kettle, dehydrating for 1-3h at 90-100 ℃, adding modified nano titanium dioxide, stirring for 0.5-2h at 70-90 ℃, adding isocyanate and a diluent, reacting for 1-4h at 70-90 ℃, uniformly stirring, cooling, and discharging to obtain a component A;
(2) preparing a component B: adding the amino-terminated polyether, the auxiliary agent and the additive into a reaction kettle, stirring and heating to 70-90 ℃, continuing stirring for 2-4h, adding the chain extender, the flame retardant, the amino silicone oil and the graphene, and continuing stirring for 2-3h to obtain the component B.
2. The coating of claim 1, wherein: the pigment is selected from at least one of carbon black and titanium dioxide.
3. A method for preparing the polyurea explosion-proof coating for construction according to any one of claims 1 to 2, wherein: the method comprises the following steps:
(1) preparing a component A: adding polyethylene glycol-400 and nano titanium dioxide powder into deionized water, adjusting pH to 4-5 with sodium hydroxide and hydrochloric acid, stirring for 0.5-1.5h, and ultrasonically dispersing for 0.5-1.5h to obtain nano titanium dioxide dispersion liquid; then adding gamma-ureidopropyltriethoxysilane coupling agent, adjusting pH to 4-5, stirring for 1-2h at 50-70 ℃, then centrifugally separating, taking precipitate, re-dispersing the precipitate into deionized water, ultrasonically treating for 0.5-1h, centrifugally separating, removing excessive silane coupling agent, repeating the operation for three times, drying for 24-48h at 95-103 ℃, and cooling in vacuum for 2-3h to obtain modified nano titanium dioxide powder; adding polyether polyol into a reaction kettle, dehydrating for 1-3h at 90-100 ℃, adding modified nano titanium dioxide, stirring for 0.5-2h at 70-90 ℃, adding isocyanate and a diluent, reacting for 1-4h at 70-90 ℃, cooling after uniformly stirring, and discharging to obtain a component A;
(2) preparing a component B: adding the amino-terminated polyether, the auxiliary agent and the additive into a reaction kettle, stirring and heating to 70-90 ℃, continuing stirring for 2-4h, adding the chain extender, the flame retardant, the amino silicone oil and the graphene, and continuing stirring for 2-3h to obtain the component B.
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