CN115301518B - Polyurea composite coating, composite material and preparation method thereof - Google Patents

Polyurea composite coating, composite material and preparation method thereof Download PDF

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CN115301518B
CN115301518B CN202211062491.3A CN202211062491A CN115301518B CN 115301518 B CN115301518 B CN 115301518B CN 202211062491 A CN202211062491 A CN 202211062491A CN 115301518 B CN115301518 B CN 115301518B
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polyurea
substrate
coating
modified material
composite
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CN115301518A (en
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张浩天
胡家念
贾永胜
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Jianghan University
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Jianghan University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/36—Successively applying liquids or other fluent materials, e.g. without intermediate treatment
    • B05D1/38—Successively applying liquids or other fluent materials, e.g. without intermediate treatment with intermediate treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/10—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an adhesive surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/52—Two layers
    • B05D7/54—No clear coat specified
    • B05D7/542—No clear coat specified the two layers being cured or baked together
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/52—Two layers
    • B05D7/54—No clear coat specified
    • B05D7/544—No clear coat specified the first layer is let to dry at least partially before applying the second layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2503/00—Polyurethanes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2518/00—Other type of polymers

Abstract

The application relates to the field of polyurea composite materials, in particular to a polyurea composite coating, a composite material and a preparation method thereof; the polyurea composite coating comprises N modified material coatings and N polyurea elastic coating layers, wherein the N modified material coatings and the N polyurea elastic coating layers are alternately arranged; the composite material comprises a substrate and a polyurea composite coating, wherein the polyurea composite coating is coated on at least one surface of the substrate; the method comprises the following steps: pretreating the substrate, and cleaning the rear surface to obtain a third substrate; spraying a modified material coating, and drying to obtain a substrate containing the modified material coating; spraying a polyurea elastic coating layer, and solidifying the polyurea to obtain a polyurea composite material; the bonding strength between the material and the polyurea elastic coating layer is improved through the modified material coating, and meanwhile, bubbles can be avoided between the polyurea elastic coating layer and the substrate, so that the explosion-proof performance of the material can be effectively improved through the polyurea elastic coating layer.

Description

Polyurea composite coating, composite material and preparation method thereof
Technical Field
The application relates to the field of polyurea composite materials, in particular to a polyurea composite coating, a composite material and a preparation method thereof.
Background
The polyurea has the characteristics of light weight, high strength, strong strain dependence, low cost, simple and convenient construction process and the like, can be flexibly sprayed on a vertical surface, an inclined surface, a vertical surface or any curved surface, and can be quickly solidified to reach higher strength after being sprayed, so that the polyurea can be widely applied to the fields of water resistance, wear resistance, corrosion resistance and the like, and can be further applied to the field of antiknock. At present, the polyurea material is sprayed on a structure, so that a light high-strength anti-explosion structure can be realized, and the polyurea material has huge potential application on military-grade anti-explosion vehicles and ships.
Although the polyurea elastic coating belongs to the polyurethane elastic coating from certain angles, if the polyurethane coating of the traditional non-polyurea elastic coating is applied to an antiknock material, the coating is formed by only adopting the polyurea elastic coating, and the coating capability and the bonding performance of the polyurea elastic coating are insufficient, so that the coating cannot be effectively covered on the surface of the material, the antiknock performance of the whole material is lower, and the requirement of high-strength antiknock performance cannot be met, so that how to provide a polyurea composite coating with excellent antiknock performance is a technical problem to be solved at present.
Disclosure of Invention
The application provides a polyurea composite coating, a composite material and a preparation method thereof, which are used for solving the technical problem that the explosion-proof performance of an explosion-proof material of a traditional polyurethane elastic coating in the prior art is too low.
In a first aspect, the application provides a polyurea composite coating, which comprises N modified material coatings and N polyurea elastic coating layers, wherein N modified material coatings and N polyurea elastic coating layers are alternately arranged, N is more than or equal to 1, and N is a positive integer.
Optionally, the modified material coating comprises a polyurethane modified material coating, and the raw materials of the polyurethane modified material coating comprise polyurethane and ethyl acetate.
Optionally, the mass ratio of the polyurethane to the ethyl acetate is 1:1.5-1:4.
Optionally, the raw materials of the polyurea elastic coating layer include isocyanate and amino compound components.
Optionally, the mass ratio of the isocyanate to the amino compound is 1:1.05-1.1.
In a second aspect, the present application provides a polyurea composite, the composite includes a substrate and the polyurea composite coating of the first aspect, the polyurea composite coating is coated on at least one side of the substrate, the innermost layer of the polyurea composite coating is a modified material coating, and the outermost layer of the polyurea composite coating is a polyurea elastic coating layer.
In a third aspect, the present application provides a method of preparing a polyurea composite, the method comprising:
preprocessing the substrate, and then cleaning the surface to obtain a third substrate;
spraying a modified material coating on the surface of the third substrate, and drying to obtain a substrate containing the modified material coating;
and spraying a polyurea elastic coating layer on the surface of the substrate containing the modified material coating, and then solidifying the polyurea to obtain the polyurea composite material.
Optionally, the pre-treating the substrate and then performing surface cleaning to obtain a third substrate specifically includes:
pretreating the substrate by sand paper to obtain a first substrate;
oil and rust removal are carried out on the first substrate by using a cleaning agent, and a second substrate is obtained;
and cleaning the first surface stains on the second substrate, and then cleaning the second surface stains by using an organic solvent to obtain a third substrate.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
according to the polyurea composite coating provided by the embodiment of the application, the bonding surface of the polyurea elastic coating layer and the material is improved by using the modified material coating layer through the polyurea elastic coating layer and the modified material coating layer which are alternately arranged, and the polarity of the modified material is the same as that of the polyurea elastic coating layer, so that the bonding strength between the material to be coated and the polyurea elastic coating layer can be improved, and meanwhile, the occurrence of bubbles between the polyurea elastic coating layer and the material can be avoided, so that the phenomena of foaming and swelling can be prevented, the polyurea elastic coating layer is uniformly paved on the surface of the material to be coated, and the coating capacity and the bonding capacity between the polyurea elastic coating layer and the material to be coated are improved, so that the explosion-proof performance of the whole material can be effectively improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
In order to more clearly illustrate the embodiments of the application or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic structural diagram of a polyurea composite provided by an embodiment of the present application;
FIG. 2 is a schematic illustration of a coating of a modified material according to an embodiment of the present application;
FIG. 3 is a schematic illustration of a spray coating of a polyurea elastomeric coating layer provided in accordance with an embodiment of the present application;
FIG. 4 is a schematic flow chart of a method according to an embodiment of the present application;
FIG. 5 is a detailed flow chart of a method according to an embodiment of the present application;
FIG. 6 is a schematic structural diagram of a polyurea composite coating coated on one side of a substrate according to an embodiment of the present application;
FIG. 7 is a schematic illustration of a polyurea composite coating coated on one side of a substrate according to an embodiment of the present application;
FIG. 8 is a schematic structural diagram of a polyurea composite coating coated on both sides of a substrate according to an embodiment of the present application;
FIG. 9 is a microstructure of a polyurea composite coated product coated on one side of a substrate according to an embodiment of the present application;
FIG. 10 is a schematic reaction diagram of a polyurea material according to an embodiment of the present application;
FIG. 11 is a graph showing the comparison of the bond strength of an unbrushed modified material coating and a polyurea composite coating having a brushed modified material coating provided by an embodiment of the present application;
wherein, the substrate is 1-substrate, the coating of 2-modified material, the coating of 3-polyurea elastic.
Detailed Description
The advantages and various effects of the present application will be more clearly apparent from the following detailed description and examples. It will be understood by those skilled in the art that these specific embodiments and examples are intended to illustrate the application, not to limit the application.
Throughout the specification, unless specifically indicated otherwise, the terms used herein should be understood as meaning as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. In case of conflict, the present specification will control.
Unless otherwise specifically indicated, the various raw materials, reagents, instruments, equipment and the like used in the present application are commercially available or may be prepared by existing methods.
The inventive thinking of the application is: polyurea sprays are based on the chemical reaction of isocyanates and are sprayed using high temperature, high pressure spray guns. The essence of the synthesis of polyurea elastomer is the reaction of isocyanate (A component), hydroxyl compound (synthesis of semi-prepolymer) and amino compound (B component), and the two reactions are all gradual addition polymerization reactions of hydrogen transfer, and can generate carbamate group, urea group and other compounds.
As shown in fig. 10, the cross-linking reaction of the spray polyurea coating is essentially that the semi-prepolymer reacts with the aminopolyether and the amine chain extender to form ureido groups, and the radical compound forming ureido groups, namely polyurea. Wherein, because the aminopolyether has high activity, the reaction can be cured and molded in a very short time without a catalyst.
The reaction mechanism of the spray-coating polyurea elastic coating is quite different from that of the traditional spray-coating polyurethane elastic coating, urea groups in the spray-coating polyurea elastic coating are in a geometrically symmetrical structure taking C=O groups as the center according to molecular structure analysis, and the urea groups are more stable than carbamate groups of the polyurethane coating, so that the comprehensive performances of aging resistance, wear resistance, corrosion resistance and the like of the polyurea coating are better than those of polyurethane, and the application of the polyurea elastic coating on a super-strong board is feasible to improve the antiknock performance of the super-strong board.
However, since the polyurea elastic coating is used on the super-strong board and is easy to generate foaming and swelling phenomena due to different polarities, the explosion-proof performance of the super-strong board can be affected, and therefore, the problem of combination of the polyurea elastic coating and the super-strong board needs to be further solved.
The technical scheme provided by the embodiment of the application aims to solve the technical problems, and the overall thought is as follows:
in one embodiment of the present application, as shown in FIG. 1, a polyurea composite coating is provided, wherein the polyurea composite coating comprises N modified material coatings and N polyurea elastic coating layers, and N modified material coatings and N polyurea elastic coating layers are alternately arranged, wherein N is greater than or equal to 1 and N is a positive integer.
In some alternative embodiments, the modifying material coating comprises a polyurethane-type modifying material coating.
In the embodiment of the application, the modified coating layer is controlled to be a polyurethane modified material coating layer, and the modified coating layer and the polyurea elastic coating layer are firmly bonded by utilizing the strong adhesion of polyurethane.
In some alternative embodiments, as shown in fig. 2, the modified material coating 2 includes a polyurethane-type modified material coating 2, and the raw materials of the polyurethane-type modified material coating 2 include polyurethane and ethyl acetate.
In the embodiment of the application, the positive effect of controlling the composition of the raw materials of the polyurethane-type modified material coating 2 is that the polyurethane and the ethyl acetate can form the double-component polyurethane-type coating, and the double-component polyurethane-type coating has good adhesion, so that the adhesion between the substrate 1 and the modified material coating 2 is firm, and meanwhile, the substrate 1 can be firmly adhered with the polyurea elastic coating layer 3 through the modified material coating 2.
In some alternative embodiments, the mass ratio of the polyurethane to the ethyl acetate is 1:1.5 to 1:4.
In the embodiment of the application, the positive effect of controlling the mass ratio of polyurethane to ethyl acetate to be 1:1.5-1:4 is that the cohesiveness between the polyurea material and the steel plate is high within the mass ratio range; when the mass ratio is larger or smaller than the end value of the range, the polyurea material bubbles bulge or have lower bonding degree to some extent.
In some alternative embodiments, as shown in fig. 3, the starting materials for the polyurea elastomeric coating layer 3 include an isocyanate and an amino compound component, wherein the amino compound component is an amine terminated polyether and a liquid ammonia chain extender.
In the embodiment of the application, the raw materials of the polyurea elastic coating layer 3 are controlled, so that the reaction between isocyanate and amino compounds can generate the polyurea elastic coating, and a large amount of polyurea materials can be formed on the surface of the modified material coating layer 2, so that the polyurea elastic coating layer 3 is completely molded.
In some alternative embodiments, the mass ratio of the isocyanate to the amino compound is 1:1.05 to 1.1, wherein the mass ratio of the isocyanate to the amino compound may be 1:1.05, 1:1.08, 1:1.09, or 1:1.1.
In the embodiment of the application, the positive effect of controlling the mass ratio of isocyanate to amino compound to be 1:1.05-1.1 is that the spraying effect can be ensured to be uniform within the range of the mass ratio, and the foaming performance is not easy to be excellent; when the value of the mass ratio is larger or smaller than the end value of the range, the property difference of the polyurea composite coating can be large to a certain extent, the polyurea composite coating is good and bad, the water in the air is easy to react, and air bubbles are easy to generate.
In some alternative embodiments, the modified material coating 2 has a thickness of 100 μm to 500 μm.
In the embodiment of the application, the thickness of the modified material coating 2 is 100-500 mu m, and the positive effects are that in the thickness range, the bonding strength of the modified material is enhanced, no bubbles are generated between the substrate 1 and the polyurea elastic coating layer 3, the phenomena of foaming and swelling are prevented, the polyurea elastic coating layer 3 is uniformly paved on the surface of the modified material coating 2, and the explosion-proof performance of the substrate 1 is improved; when the thickness is larger or smaller than the end value of the range, the adhesion strength between the substrate 1 and the paint layer 3 may be unstable to some extent.
In some alternative embodiments, the thickness of the polyurea elastic coating layer 3 is 2mm to 8mm.
In the embodiment of the application, the positive effect that the thickness of the polyurea elastic coating layer 3 is 2-8 mm is that the steel plate coated with the polyurea composite coating can achieve the optimal protection effect within the thickness range; when the thickness is greater than or less than the end value of the range, it may be caused to a certain extent that a certain protective effect is greatly reduced when the thickness of the polyurea elastic coating layer 3 is less than 2mm or that the protective effect on the substrate 1 is not significantly enhanced and is uneconomical when the thickness of the polyurea elastic coating layer 3 is greater than 8mm.
In one embodiment of the present application, as shown in fig. 2, a polyurea composite is provided, where the composite includes a substrate 1 and the polyurea composite coating, the polyurea composite coating is coated on at least one surface of the substrate 1, the innermost layer of the polyurea composite coating is a modified material coating, and the outermost layer of the polyurea composite coating is a polyurea elastic coating layer, where the substrate 1 may be a super-strong steel substrate, a plastic substrate, an explosion-proof glass substrate, or other materials with explosion-proof performance.
In one embodiment of the present application, as shown in fig. 4, there is provided a method of preparing a polyurea composite, the method comprising:
s1, preprocessing the substrate 1, and then cleaning the surface to obtain a third substrate;
s2, spraying the modified material coating 2 on the surface of the third substrate, and drying to obtain a substrate containing the modified material coating 2;
s3, spraying a polyurea elastic coating layer 3 on the surface of the substrate 1 containing the modified material coating layer 2, and then solidifying polyurea to obtain a polyurea composite material, wherein different pressure values of 1800-2000 psi, 2000-2500 psi and 2500-3000 psi of a high-temperature high-pressure spraying machine are adopted for spraying, and meanwhile, the temperature value of the high-temperature high-pressure spraying machine can be set to be 5 ℃, 60 ℃, 65 ℃, 70 ℃ and 80 ℃ for spraying.
In some alternative embodiments, the pre-treating the substrate 1 and then performing surface cleaning to obtain a third substrate specifically includes:
s101, polishing the substrate 1 by sand paper to obtain a first substrate;
s102, degreasing and derusting the first substrate by using a cleaning agent to obtain a second substrate;
s103, cleaning the first surface stains on the second substrate, and then cleaning the second surface stains by using an organic solvent to obtain a third substrate.
In the embodiment of the application, when the substrate 1 is a super-strong steel substrate, most rust stains on the surface of the substrate 1 can be removed and the removed stains on the surface of the substrate 1 can be removed by polishing the substrate 1, then the residual stains on the surface of the substrate 1 are cleaned by a cleaning agent to remove oil stains and stains, and finally the second surface stains are cleaned by an organic solvent to avoid the oil stains, so that a third substrate can be obtained, and the subsequent spraying of the modified material coating 2 is convenient.
In some alternative embodiments, the detergent HY-303 type strong rust and oil remover.
Example 1
A polyurea composite coating, which comprises 1 modified material coating 2 and 1 polyurea elastic coating layer 3, wherein the modified material coating 2 and the polyurea elastic coating layer 3 are alternately arranged.
The modified material coating 2 comprises a polyurethane modified material coating 2, and the raw materials of the polyurethane modified material coating 2 comprise polyurethane and ethyl acetate.
The mass ratio of polyurethane to ethyl acetate was 1:3.
The raw materials of the polyurea elastic coating layer 3 include isocyanate and amino compound components.
The mass ratio of isocyanate to amino compound was 1:1.08.
The thickness of the modified material coating 2 was 100. Mu.m.
The thickness of the polyurea elastic coating layer 3 was 6mm.
As shown in fig. 6 and 7, the composite material comprises a substrate 1 and a polyurea composite coating coated on one surface of the substrate 1, wherein the polyurea composite coating comprises 1 modified material coating 2 and 1 polyurea elastic coating layer 3, the modified material coating 2 and the polyurea elastic coating layer 3 are alternately arranged, the innermost layer of the polyurea composite coating is the modified material coating 2, and the outermost layer of the polyurea composite coating is the polyurea elastic coating layer 3.
A method of preparing a polyurea composite comprising:
s101, polishing the substrate 1 by using 80-mesh sand paper to obtain a first substrate;
s102, degreasing and derusting the first substrate by using a cleaning agent to obtain a second substrate, wherein the specific steps are as follows:
placing the substrate 1 on the surface of a table top, dipping a fixed amount of cleaning liquid by a brush, brushing the surface of the substrate 1, and then standing the substrate 1 with the rust and oil removing cleaning agent for 10-15 min to obtain a second substrate;
s103, cleaning the first surface dirt on the second substrate in a dry towel wiping mode, spraying absolute ethyl alcohol on the second substrate to clean the second surface dirt, and then performing heating drying 10 to obtain a third substrate.
S2, spraying the modified material coating 2 on the surface of the third substrate, and drying for 10-15 min to prevent the third substrate from rust again, so as to obtain a substrate 1 containing the modified material coating 2;
s3, spraying the polyurea elastic coating layer 3 on the surface of the substrate 1 containing the modified material coating layer 2, and then solidifying the polyurea to obtain the polyurea composite material shown in fig. 9.
The cleaning agent HY-303 type powerful rust and oil removing agent.
Example 2
Example 1 and example 2 are compared, and example 2 and example 1 differ in that:
as shown in fig. 8, the composite material comprises a substrate 1 and polyurea composite coatings coated on two sides of the substrate 1, wherein the polyurea composite coatings comprise 1 modified material coating 2 and 1 polyurea elastic coating layer 3, the modified material coating 2 and the polyurea elastic coating layer 3 are alternately arranged, the innermost layer of the polyurea composite coatings is the modified material coating 2, and the outermost layer of the composite material is the polyurea elastic coating layer 3.
Example 3
Comparing example 3 with example 1, example 3 differs from example 1 in that:
the mass ratio of polyurethane to ethyl acetate is 1:1.5.
The mass ratio of isocyanate to amino compound was 1:1.08.
The thickness of the modified material coating 2 was 100. Mu.m.
The thickness of the polyurea elastic coating layer 3 was 2mm.
Example 4
Comparing example 4 with example 1, example 4 differs from example 1 in that:
the mass ratio of polyurethane to ethyl acetate was 1:4.
The mass ratio of isocyanate to amino compound was 1:1.08.
The thickness of the modified material coating 2 was 500 μm.
The thickness of the polyurea elastic coating layer 3 is 3mm.
Comparative example 1
Comparative example 1 was compared with example 1, and the difference between comparative example 1 and example 1 was that:
the modified material coating 2 is not used,
the thickness of the polyurea elastic coating layer 3 was 1mm.
Comparative example 2
Comparative example 2 and example 1 were compared, and the comparative example 2 and example 1 differ in that:
the mass ratio of polyurethane to ethyl acetate is 1:1.
The mass ratio of isocyanate to amino compound was 1:1.08.
The thickness of the modified material coating 2 was 80 μm.
The thickness of the polyurea elastic coating layer 3 was 2mm.
Comparative example 3
Comparative example 3 was compared with example 1, and the difference between comparative example 3 and example 1 was that:
the mass ratio of polyurethane to ethyl acetate was 1:5.
The mass ratio of isocyanate to amino compound was 1:1.08.
The thickness of the modified material coating 2 was 600 μm.
The thickness of the polyurea elastic coating layer 3 is 3mm.
Related experiments:
the products obtained in each example and each comparative example were collected and subjected to performance test, and the results are shown in table 1.
Test method of related experiment:
bond strength data: a comparison experiment is carried out by respectively bonding the non-brushed modified material coating 2 and the polyurea composite coating brushed with the modified material coating 2 on the steel substrate 1, and experimental equipment is carried out by using an Instron company 68TM-30 type universal tensile testing machine in America.
TABLE 1
Specific analysis of table 1:
the bonding strength of the coating refers to the bonding strength between the polyurea composite coating and the steel plate, and the larger the bonding strength is, the firm bonding of the polyurea composite coating on the steel plate is indicated, so that the explosion-proof effect of the steel plate can be effectively improved.
From the data of examples 2-3 and comparative examples 1-3, it can be seen that:
as shown in the data of fig. 11 and table 1, the adhesive strength gradually decreases as the thickness of the polyurea elastic coating layer 3 increases, and when the modified material coating layer 2 is used, the adhesive strength of the polyurea composite coating layer is greatly increased compared with that of the coating layer 2 without brushing the modified material, and the explosion-proof effect is more favorably affected.
One or more technical solutions in the embodiments of the present application at least have the following technical effects or advantages:
(1) According to the polyurea composite coating provided by the embodiment of the application, the polyurea elastic coating layers 4 and the modified material coating layers 3 are alternately arranged, and the modified material coating layers 3 are utilized to improve the bonding surface of the polyurea elastic coating layers 4 and the material, so that the polyurea elastic coating layers 4 are uniformly paved on the surface of the substrate 1, and further, the coating capacity and the bonding capacity between the polyurea elastic coating layers 4 and the material to be coated are improved, and the explosion-proof performance of the whole material can be effectively improved by the polyurea elastic coating layers 4.
(2) According to the composite material provided by the embodiment of the application, the polyurea composite coating comprising the modified material coating 2 and the polyurea elastic coating layer 3 is arranged on the surface of the substrate 1, and the modified material coating 2 is arranged on the surface of the substrate 1, so that the bonding strength between the substrate 1 and the polyurea elastic coating layer 3 is improved, and meanwhile, bubbles between the polyurea elastic coating layer 3 and the substrate 1 can be avoided, so that the phenomena of foaming and swelling can be prevented, the polyurea elastic coating layer 3 is uniformly paved on the surface of the substrate 1, and the explosion-proof performance of the substrate 1 can be effectively improved by the polyurea elastic coating layer 3.
(3) The composite material provided by the embodiment of the application utilizes the excellent characteristics of the polyurea material, including the advantages of high elongation, high nonlinearity, strong strain rate dependence, good shock resistance and good toughness, and simultaneously combines the substrate 1 with relatively high rigidity, so that the anti-explosion performance of the substrate 1 can be effectively improved by combining the polyurea material.
(4) When the substrate is a steel plate with antiknock performance, compared with the steel plate with antiknock performance of the same grade, the composite material provided by the embodiment of the application has the advantages of light weight and high strength because the polyurea elastic coating layer 4 can replace part of the thickness of the material and the material is lighter than steel.
(5) The method provided by the embodiment of the application has the advantages of simple and convenient preparation method, no pollution, strong practicability, environmental protection and low production cost.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.
The endpoints and any values of the ranges disclosed herein are not limited to the precise range or value, and are understood to encompass values approaching those ranges or values. For numerical ranges, one or more new numerical ranges may be found between the endpoints of each range, between the endpoint of each range and the individual point value, and between the individual point value, in combination with each other, and are to be considered as specifically disclosed herein.
The foregoing is only a specific embodiment of the application to enable those skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (3)

1. The composite material is characterized by comprising a substrate and a polyurea composite coating, wherein the polyurea composite coating is coated on at least one surface of the substrate, the innermost layer of the polyurea composite coating is a modified material coating, the outermost layer of the polyurea composite coating is a polyurea elastic coating layer, the polyurea composite coating comprises N modified material coatings and N polyurea elastic coating layers, the N modified material coatings and the N polyurea elastic coating layers are alternately arranged, N is more than 1 and N is a positive integer, the modified material coating comprises a polyurethane modified material coating, the raw materials of the polyurethane modified material coating comprise polyurethane and ethyl acetate, the raw materials of the polyurea elastic coating layer comprise isocyanate and amino compound components, the mass ratio of the polyurethane to the ethyl acetate is 1:1.5-1:4, the mass ratio of the isocyanate to the amino compound is 1:1.05-1.1, the thickness of the modified material coating is 100-500 mu m, the thickness of the polyurea elastic coating layer is 2-8 mm, and the substrate or the glass substrate comprises super-strength steel.
2. A method of preparing the polyurea composite of claim 1, wherein the method comprises:
preprocessing the substrate, and then cleaning the surface to obtain a third substrate;
spraying a modified material coating on the surface of the third substrate, and drying to obtain a substrate containing the modified material coating;
and spraying a polyurea elastic coating layer on the surface of the substrate containing the modified material coating, and then solidifying the polyurea to obtain the polyurea composite material.
3. The method according to claim 2, wherein the pre-treating the substrate followed by surface cleaning results in a third substrate, specifically comprising:
pretreating the substrate by sand paper to obtain a first substrate;
oil and rust removal are carried out on the first substrate by using a cleaning agent, and a second substrate is obtained;
and cleaning the first surface stains on the second substrate, and then cleaning the second surface stains by using an organic solvent to obtain a third substrate.
CN202211062491.3A 2022-08-31 2022-08-31 Polyurea composite coating, composite material and preparation method thereof Active CN115301518B (en)

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