CN114854293A - Polyurea coating and preparation method thereof - Google Patents

Polyurea coating and preparation method thereof Download PDF

Info

Publication number
CN114854293A
CN114854293A CN202210692829.7A CN202210692829A CN114854293A CN 114854293 A CN114854293 A CN 114854293A CN 202210692829 A CN202210692829 A CN 202210692829A CN 114854293 A CN114854293 A CN 114854293A
Authority
CN
China
Prior art keywords
component
amino
parts
polyurea coating
chain extender
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210692829.7A
Other languages
Chinese (zh)
Inventor
陈强
范艺千
谭祖中
班登超
王飞
吴湘南
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CRRC Zhuzhou Vehicle Co Ltd
Original Assignee
CRRC Zhuzhou Vehicle Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CRRC Zhuzhou Vehicle Co Ltd filed Critical CRRC Zhuzhou Vehicle Co Ltd
Priority to CN202210692829.7A priority Critical patent/CN114854293A/en
Publication of CN114854293A publication Critical patent/CN114854293A/en
Priority to PCT/CN2022/137275 priority patent/WO2023240945A1/en
Pending legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/02—Polyureas
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • 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
    • C08G18/4063—Mixtures of compounds of group C08G18/62 with other macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • 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
    • C08G18/48—Polyethers
    • C08G18/4804—Two or more polyethers of different physical or chemical nature
    • C08G18/482—Mixtures of polyethers containing at least one polyether containing nitrogen
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • 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
    • C08G18/48—Polyethers
    • C08G18/50—Polyethers having heteroatoms other than oxygen
    • C08G18/5021—Polyethers having heteroatoms other than oxygen having nitrogen
    • C08G18/5024—Polyethers having heteroatoms other than oxygen having nitrogen containing primary and/or secondary amino groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • 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
    • C08G18/61—Polysiloxanes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • 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
    • C08G18/62—Polymers of compounds having carbon-to-carbon double bonds
    • C08G18/6295—Polymers of silicium containing compounds having carbon-to-carbon double bonds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/08—Anti-corrosive paints
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G2150/00—Compositions for coatings
    • C08G2150/90—Compositions for anticorrosive coatings

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Paints Or Removers (AREA)

Abstract

The invention provides a polyurea coating and a preparation method thereof, belonging to the technical field of coatings, wherein the polyurea coating comprises a first component and a second component; the first component comprises the following raw materials: polyether polyols and isocyanates; the second component comprises the following raw materials in parts by mass: 40-60 parts of amino-terminated polyether, 15-20 parts of modified resin and 20-40 parts of amino chain extender. The polyurea coating disclosed by the invention not only has excellent impact resistance, corrosion resistance and wear resistance, but also has the effects of surface self-cleaning and anti-icing, can improve the anti-contamination and anti-icing capabilities of the inner wall of the wagon compartment of the railway wagon, is beneficial to unloading goods, and effectively solves the problems of powder contamination adhesion and the like existing on the inner wall of the wagon body of the railway wagon.

Description

Polyurea coating and preparation method thereof
Technical Field
The invention relates to the technical field of coatings, in particular to a polyurea coating and a preparation method thereof.
Background
The polyurea coating has excellent impact resistance, corrosion resistance and wear resistance, has good application prospect on railway vehicles, and can prevent the inner wall of a railway vehicle body from being capable of withstanding high-frequency impact and abrasion of goods for a long time.
However, in the prior art, the prior polyurea coating has the problem of poor stain resistance.
Disclosure of Invention
The invention aims to provide a polyurea coating and a preparation method thereof, which can effectively solve the problem of poor stain resistance of the existing polyurea coating.
In a first aspect, embodiments of the present disclosure provide a polyurea coating including a first component and a second component;
the first component comprises the following raw materials: polyether polyols and isocyanates;
the second component comprises the following raw materials in parts by mass: 40-60 parts of amino-terminated polyether, 15-20 parts of modified resin and 20-40 parts of amino chain extender; wherein the modified resin is at least one of silicon modified resin and fluorine modified resin.
Further, the mass ratio of the amino-terminated polyether to the modified resin is (3-4): 1.
Further, the modified resin is at least one of silicon modified acrylic resin JZ-9540 and fluorine modified silicon resin HY-F-101.
Further, the amino-terminated polyether is amino-terminated polyether D-2000.
Further, the amino chain extender is an amino chain extender E-100 and an amino chain extender 6200, and the mass ratio of the amino chain extender to the amino chain extender is 1 (1.5-2).
Furthermore, the ratio of the amount of isocyanate substance in the first component to the sum of the amounts of amino terminated polyether, E-100 and amino chain extender 6200 in the second component is 1.01-1.08.
Further, the viscosity of the first component at a temperature of 25 ℃ is 800-1200 mpa.s, and the NCO index is 14.7% +/-0.3%.
Further, the viscosity of the second component at 25 ℃ is 1300-1700 mpa.s, and the water content is less than or equal to 0.1%.
Further, the mass ratio of the first component to the second component is 1.05: 1; or the volume ratio of the first component to the second component is 1:1.
In a second aspect, embodiments of the present invention provide a method for preparing the polyurea coating, the method including:
reacting the polyether polyol subjected to vacuum dehydration with isocyanate, sampling and measuring the NCO content, and obtaining the first component after the NCO content reaches a set value;
and mixing the raw materials in the second component, dehydrating, sampling, measuring the water content, and obtaining the second component after the water content reaches a set value.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
according to the polyurea coating provided by the embodiment of the invention, the first component of the polyurea coating is synthesized by selecting the polyether polyol and the isocyanate, so that the polyurea coating has impact resistance, corrosion resistance and wear resistance; and selecting the amine-terminated polyether, the modified resin, the amine chain extender and the dosage proportion thereof to synthesize the second component of the polyurea coating, so that the surface energy of the coating is reduced, and the anti-contamination property of the existing polyurea coating is effectively improved through the synergistic cooperation effect of the first component and the second component.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a process flow diagram of a preparation method of a polyurea coating provided in the examples of the present application.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings 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 invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
The polyurea coating has excellent impact resistance, corrosion resistance and wear resistance, has good application prospect in railway vehicles, and can prevent the inner wall of a railway vehicle body from being capable of withstanding high-frequency impact and abrasion of goods for a long time.
However, in the prior art, the prior polyurea coating has the problem of poor contamination resistance, so that the inner wall of a railway vehicle loaded with powder is affected by the contamination adhesion of materials. If the vehicle runs in a low-temperature cold season, the cargos such as powder are easy to agglomerate with ice and adhere to the inner surface of the vehicle body, so that the cargos are not unloaded completely, and the loading benefit is influenced.
In view of this, in order to solve the above technical problems, the general idea provided by the embodiments of the present invention is as follows:
in a first aspect, embodiments of the present disclosure provide a polyurea coating including a first component and a second component;
the first component comprises the following raw materials: polyether polyols and isocyanates;
the second component comprises the following raw materials in parts by mass: 40-60 parts of amino-terminated polyether, 15-20 parts of modified resin and 20-40 parts of amino chain extender; wherein the modified resin is at least one of silicon modified resin and fluorine modified resin.
The polyurea coating provided by the embodiment of the invention comprises a first component and a second component, and the first component of the polyurea coating is synthesized by selecting polyether polyol and isocyanate, so that the performance indexes such as tensile strength, elongation at break, low-temperature flexibility and the like are in excellent states, and the impact resistance, corrosion resistance and wear resistance of the polyurea coating are ensured; the second component of the polyurea coating is synthesized by selecting the amino-terminated polyether, the modified resin (at least one of the silicon modified resin and the fluorine modified resin) and the amino chain extender, and the dosage ratio of the second component to the amino-terminated polyether to the modified resin is controlled, so that the polyurea coating has the effects of surface self-cleaning and anti-icing, the anti-fouling and anti-icing capability of the inner wall of a vehicle body such as a railway vehicle can be improved, and the unloading of goods is facilitated; meanwhile, the chemical crosslinking of the polyurea coating can be improved, and the tensile strength, hardness and wear resistance of the material can be further improved.
In some embodiments, the polyether polyols include, but are not limited to, polyether polyol N204, polyether polyol N210, polyether polyol N220, polyether polyol N240, polyether polyol N280, polyether polyol N303F, polyether polyol N305, polyether polyol N306, polyether polyol N307, polyether polyol N330, other suitable polyether polyols, or any mixture of the foregoing; isocyanates include, but are not limited to, toluene diisocyanate TDI-80, isocyanate MDI-50, other suitable isocyanates; the amino-terminated polyether can be 40 parts, 45 parts, 50 parts, 53 parts, 55 parts, 58 parts, 60 parts and the like; the modified resin can be 15 parts, 16 parts, 17 parts, 18.5 parts, 19 parts and 20 parts; the amino chain extender may be 20 parts, 23 parts, 25 parts, 26 parts, 30 parts, 35 parts, 38 parts, 40 parts. The material is tested, tried and actually used due to the comprehensive consideration of the cost, safety, environmental protection and performance of raw materials. Preferably, the polyether polyol comprises the following components in parts by mass: 30-40 parts of polyether polyol (N220) and 10-20 parts of polyether polyol (N330). Preferably, the isocyanate is selected from 30-60 parts of isocyanate (MDI-50), and by adopting the isocyanate MDI-50, the damage of volatilization of the isocyanate to constructors and environment can be reduced.
As an implementation mode of the embodiment of the invention, the mass ratio of the amino-terminated polyether to the modified resin is (3-4): 1.
The reason for controlling the mass ratio of the amino-terminated polyether to the modified resin to be (3-4):1 is that: an excessively large ratio adversely affects poor stain resistance, and an excessively small ratio adversely affects poor mechanical properties of the coating film. In some embodiments, the mass ratio of the amino-terminated polyether to the modified resin can be 3:1, 3.5:1, 4:1, and the like.
As an implementation mode of the embodiment of the invention, the fluorine modified resin is silicon modified acrylic resin JZ-9540 and fluorine modified silicon resin HY-F-101.
The reason for selecting the silicon modified acrylic resin JZ-9540 and the fluorine modified silicon resin HY-F-101 is to increase the smoothness, improve the hydrophobic and oleophobic properties, enable the coating film to have the lotus leaf effect and have the anti-contamination function.
As an implementation manner of the embodiment of the invention, the amino-terminated polyether is amino-terminated polyether D-2000.
The reason for selecting the amino terminated polyether D-2000 is to ensure high strength and high elongation of the coating.
As an implementation manner of the embodiment of the invention, the amino chain extender is an amino chain extender E-100 and an amino chain extender 6200, and the mass ratio of the amino chain extender to the amino chain extender is 1 (1.5-2).
The reason for selecting the amino chain extender E-100 and the amino chain extender 6200 with the mass ratio of 1 (1.5-2) is that the leveling property of the polyurea coating can be improved by controlling the type and the dosage of the amino chain extender, a better surface state is obtained, and the softness, the impact resistance and the low-temperature resistance of the material can be further improved. An adverse effect of too large a ratio is that the coating film is too hard, and an adverse effect of too small a ratio is that the coating film is too soft. In some embodiments, the mass ratio of amino chain extender E-100 to amino chain extender 6200 can be 1:1.5, 1:1.7, 1:1.8, 1:2, and the like.
As an implementation mode of the embodiment of the invention, the ratio of the amount of the isocyanate substance in the first component to the sum of the amounts of the amino terminated polyether, the E-100 and the amino chain extender 6200 in the second component is 1.01-1.08.
The reason for controlling the amount of the isocyanate substance is that the comprehensive properties of the polyurea coating, such as impact resistance, low temperature resistance and stain resistance, can be improved by controlling the appropriate isocyanate index (namely, the ratio of the amount of the isocyanate substance to the sum of the amounts of the amino-terminated polyether, the E-100 and the amino chain extender 6200 in the second component is 1.01-1.08); when the temperature is too low, the performance of the spray polyurea elastomer material product has large difference, and the time is good and bad; if the isocyanate content is too high, the excess isocyanate reacts with moisture in the air, and the material foams. In some embodiments, the ratio may be 1.01, 1.02, 1.03, 1.04, 1.05, 1.06, 1.07, 1.08, etc.
As an embodiment of the present invention, the viscosity of the first component is 800-1200 mpa.s at 25 ℃ and the NCO index is 14.7% + -0.3%.
The reason for controlling the viscosity of the first component is proper viscosity, and the problems that the performance of the spray polyurea elastomer material is unstable and the reaction speed is too high to generate material foaming phenomenon when the first component and the second component are mixed are avoided. In some embodiments, the viscosity may be 800mpa.s, 900mpa.s, 1000mpa.s, 1050mpa.s, 1100mpa.s, and the like.
The NCO index of the first component is controlled because of the appropriate NCO content to ensure that the materials in the first component have the appropriate reactivity.
As an implementation manner of the embodiment of the invention, the viscosity of the second component at the temperature of 25 ℃ is 1300-1700 mpa.s, and the moisture content is less than or equal to 0.1%.
The viscosity of the second component is controlled to be proper, so that the unstable performance of the spray polyurea elastomer material and the foaming phenomenon of the material caused by the over-high reaction speed when the first component and the second component are mixed are avoided; the moisture content is controlled, so that the reaction of isocyanate and moisture in the air is avoided, and the foaming phenomenon of the material can be generated. In some embodiments, the viscosity of the second component may be 1400mpa.s, 1600mpa.s, 1680mpa.s, 1700mpa.s, and the like.
As an implementation of the embodiments of the present invention, the mass ratio of the first component to the second component is 1.05: 1; or the volume ratio of the first component to the second component is 1:1.
The reason for controlling the mass ratio or the volume ratio of the first component to the second component is to ensure that the reaction ratio of the coating is accurate and the coating film has a compact structure; an excessively large ratio causes swelling and foaming of the coating film, and an excessively small ratio causes low strength and poor abrasion resistance of the coating film.
It should be noted that:
(1) the first component can be properly added with a first auxiliary agent according to the polyurea coating component disclosed in the prior art and actual needs, so that the components of the first component are stably dispersed in the system. Preferably, the first auxiliary agent comprises 1 part or less of stabilizing agent by mass, and the stabilizing agent comprises but is not limited to tartaric acid, benzoic acid, other appropriate stabilizing agents, or any mixture of the compounds.
(2) Based on the above (1), a second auxiliary agent can also be suitably added to the second component, so that the components of the second component are stably dispersed in the system. Preferably, the second auxiliary agent comprises one or more of a dispersing agent (such as a polymer nonionic aqueous dispersing agent and the like) and a defoaming agent (such as an organic silicon aqueous defoaming agent and the like), and the mass fraction is 1-5 parts. In addition, in order to prepare the actual requirement of the color of the coating, 1-5 parts of color paste can be added into the second component, wherein the color paste can be selected from amino ether as a base material and carbon black, titanium dioxide and the like as pigments.
Based on the same inventive concept, the embodiment of the invention also provides a preparation method of the polyurea coating, which comprises the following steps:
reacting the polyether polyol subjected to vacuum dehydration with isocyanate, sampling and measuring the NCO content, and obtaining the first component after the NCO content reaches a set value;
and mixing the raw materials in the second component, dehydrating, sampling, measuring the water content, and obtaining the second component after the water content reaches a set value.
In the preparation method of the polyurea coating provided by the embodiment of the invention, the overall properties of the first component and the second component in different production batches are stable by strictly controlling the property parameters of the first component and the second component, such as NCO content in the first component and water content in the second component, and when the polyurea coating is used, the total weight ratio of the first component to the second component can be determined according to the following weight ratio of A: b is 1.05:1, volume ratio A: b is mixed and cured into a film in a ratio of 1:1, so that the use convenience of the polyurea coating is improved.
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The experimental methods of the following examples, which are not specified under specific conditions, are generally determined according to national standards. If there is no corresponding national standard, it is carried out according to the usual international standards, to the conventional conditions or to the conditions recommended by the manufacturer.
Example 1
The present example provides a method for preparing a polyurea coating, as shown in fig. 1, comprising:
adding 35 parts of polyether polyol (N220) and 15 parts of polyether polyol (N330) produced by Jiangsu Jinperch company into a reaction kettle according to the mass proportion, and dehydrating for 2 hours under the vacuum condition of 120 ℃ and the vacuum degree of 0.08MPa until the water content is qualified; and then closing the vacuum pump, reducing the temperature to 60 ℃, adding 45 parts of isocyanate (MDI-50) produced by Futaiwan corporation and 0.5 part of stabilizer (tartaric acid), uniformly mixing, slowly heating to 80 ℃, reacting at constant temperature for 2 hours, sampling to measure the NCO content, reducing the temperature to 40 ℃ after a set result of 13-16%, and discharging to obtain the first component.
According to the mass ratio, 45 parts of terminal amino polyether (D-2000) produced by the American Hensman company, 15 parts of fluorine modified resin (fluorine silicon modified acrylic resin), 3 parts of auxiliary agent (dispersing agent), 15 parts of amino chain extender (E-100) produced by the American Yabao company, 15 parts of amino chain extender (6200) produced by the Nicotiana Wanhua company and 2 parts of color paste are mixed, put into a reaction kettle, dehydrated in vacuum at 120 ℃ for 1 hour, and filtered by a 200-mesh screen after the moisture is detected to be qualified, so that the second component is obtained.
An H-XP3 polyurea spraying machine produced by GRACO company in America is adopted to spray a first component and a second component according to the ratio of the first component to the second component being 1:1 (volume ratio) is mixed and sprayed on steel, the mixture is solidified into a film at the temperature of 20-35 ℃, the thickness of the dry film after the film is formed is controlled to be 2.5-3.0 mm, the neutral salt spray resistance is not less than 3000h, the artificial weather aging resistance is not less than 3000h, the tear strength is not less than 72KN/m, and the bonding strength with the steel substrate is more than 10 MPa.
Example 2
This example provides a polyurea coating that differs from example 1 only in that: the adopted second component comprises 60 parts of amino-terminated polyether (D-2000) and 18 parts of fluorine modified resin (fluorine-silicon modified acrylic resin); the rest steps and parameters are the same.
The spraying machine of H-XP3 polyurea manufactured by GRACO company in America is adopted to spray the first component and the second component according to the ratio of the first component to the second component as 1:1 (volume ratio) is mixed and sprayed on steel, the mixture is solidified into a film at the temperature of 20-35 ℃, the thickness of the dry film after the film is formed is controlled to be 2.5-3.0 mm, the neutral salt spray resistance is not less than 3000h, the artificial weather aging resistance is not less than 3000h, the tear strength is not less than 72KN/m, and the bonding strength with the steel substrate is more than 10 MPa.
Example 3
This example provides a polyurea coating that differs from example 1 only in that: the second component comprises 40 parts of amino-terminated polyether (D-2000) and 20 parts of fluorine modified resin (fluorine-silicon modified acrylic resin); the rest steps and parameters are the same.
The first component and the second component are sprayed by an H-XP3 polyurea spraying machine produced by GRACO company in America according to the ratio of the first component to the second component of 1:1 (volume ratio) is mixed and sprayed on steel, the mixture is solidified into a film at the temperature of 20-35 ℃, the thickness of the dry film after the film is formed is controlled to be 2.5-3.0 mm, the neutral salt spray resistance is not less than 3000h, the artificial weather aging resistance is not less than 3000h, the tear strength is not less than 72KN/m, and the bonding strength with the steel substrate is more than 10 MPa.
Example 4
This example provides a polyurea coating that differs from example 1 only in that: the first component used is: adding 30 parts of polyether polyol (N220) and 10 parts of polyether polyol (N330) produced by Jiangsu Jinqi corporation into a reaction kettle, and dehydrating for 2 hours under the vacuum condition of 120 ℃ and 0.08MPa of vacuum degree until the water content is qualified; then, closing a vacuum pump, reducing the temperature to 60 ℃, adding 30 parts of isocyanate (MDI-50) produced by Futaiwan corporation and 1 part of stabilizer (tartaric acid), uniformly mixing, slowly heating to 80 ℃, reacting at constant temperature for 2 hours, sampling to measure the NCO content, reducing the temperature to 40 ℃ after a set result of 13-16%, and discharging to obtain the first component; the rest steps and parameters are the same.
The spraying machine of H-XP3 polyurea manufactured by GRACO company in America is adopted to spray the first component and the second component according to the ratio of the first component to the second component as 1:1 (volume ratio) is mixed and sprayed on steel, the mixture is solidified into a film at the temperature of 20-35 ℃, the thickness of the dry film after the film is formed is controlled to be 2.5-3.0 mm, the neutral salt spray resistance is not less than 3000h, the artificial weather aging resistance is not less than 3000h, the tear strength is not less than 72KN/m, and the bonding strength with the steel substrate is more than 10 MPa.
Example 5
This example provides a polyurea coating that differs from example 1 only in that: the fluorine modified resin in the second component is fluorine modified silicon resin HY-F-101; the rest steps and parameters are the same.
The spraying machine of H-XP3 polyurea manufactured by GRACO company in America is adopted to spray the first component and the second component according to the ratio of the first component to the second component as 1:1 (volume ratio) is mixed and sprayed on steel, the mixture is solidified into a film at the temperature of 20-35 ℃, the thickness of the dry film after the film is formed is controlled to be 2.5-3.0 mm, the neutral salt spray resistance is not less than 3000h, the artificial weather aging resistance is not less than 3000h, the tear strength is not less than 72KN/m, and the bonding strength with the steel substrate is more than 10 MPa.
Comparative example 1
This example provides a polyurea coating that differs from example 1 only in that: the second component comprises 70 parts of amino-terminated polyether (D-2000) and 18 parts of fluorine modified resin (silicon modified acrylic resin); the rest steps and parameters are the same.
The spraying machine of H-XP3 polyurea manufactured by GRACO company in America is adopted to spray the first component and the second component according to the ratio of the first component to the second component as 1:1 (volume ratio) is mixed and sprayed on steel, the mixture is solidified into a film at the temperature of 20-35 ℃, the thickness of the dry film after the film is formed is controlled to be 2.5-3.0 mm, the neutral salt spray resistance is 2050h, and the artificial climate aging resistance is 1800 h.
Comparative example 2
This example provides a polyurea coating that differs from example 1 only in that: the fluorine modified resin in the second component is replaced by amino-terminated polyether T-5000; the rest steps and parameters are the same.
The spraying machine of H-XP3 polyurea manufactured by GRACO company in America is adopted to spray the first component and the second component according to the ratio of the first component to the second component as 1:1 (volume ratio) is mixed and sprayed on the steel.
Comparative example 3
This example provides a polyurea coating that differs from example 1 only in that: in the adopted second component, the fluorine modified resin is replaced by silicon modified acrylic resin JZ-9540; the rest steps and parameters are the same.
The spraying machine of H-XP3 polyurea manufactured by GRACO company in America is adopted to spray the first component and the second component according to the ratio of the first component to the second component as 1:1 (volume ratio) is mixed and sprayed on the steel.
Test examples
The polyurea coatings obtained in examples 1 to 5 and comparative examples 1 to 2 were examined and the general performance index data are shown in Table 1.
TABLE 1 polyurea coatings Performance test results
Figure BDA0003700907870000081
As can be seen from Table 1, the polyurea coating disclosed by the invention not only has excellent impact resistance, corrosion resistance and wear resistance, but also has the effects of surface self-cleaning and anti-icing, can improve the anti-contamination and anti-icing capabilities of the inner wall of the wagon compartment, is beneficial to unloading goods, and effectively solves the problems of powder contamination adhesion, ice agglomeration and the like existing on the inner wall of the wagon body of a railway vehicle. In conclusion, the polyurea coating disclosed by the invention can achieve the following effects:
(1) the tensile strength of the coating is more than or equal to 19.0MPa, the elongation at break is more than or equal to 450 percent, the tearing strength is more than or equal to 72KN/m, and the bonding strength with the steel substrate is more than 10 MPa.
(2) When the thickness of the coating is controlled to be 2.5mm-3.0mm, the neutral salt spray resistance is more than or equal to 3000h, and the artificial climate aging resistance is more than or equal to 3000 h.
(3) The water contact angle of the coating is more than or equal to 100 degrees, the icing force is less than or equal to 50 kg.f.
Finally, it is further noted that, herein, relational terms such as "first" and "second," and the like, may be 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. Also, 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.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. A polyurea coating characterized in that the polyurea coating comprises a first component and a second component;
the first component comprises the following raw materials: polyether polyols and isocyanates;
the second component comprises the following raw materials in parts by mass: 40-60 parts of amino-terminated polyether, 15-20 parts of modified resin and 20-40 parts of amino chain extender;
wherein the modified resin is at least one of silicon modified resin and fluorine modified resin.
2. The polyurea coating of claim 1, wherein the mass ratio of the amino-terminated polyether to the modified resin is (3-4): 1.
3. The polyurea coating according to claim 1 or 2, wherein the modified resin is at least one of a silicon-modified acrylic resin and a fluorine-modified silicone resin.
4. The polyurea coating of claim 3, wherein the amino-terminated polyether is amino-terminated polyether D-2000.
5. The polyurea coating according to claim 1 or 2, wherein the amino chain extender comprises a mixture of an amino chain extender E-100 and an amino chain extender 6200, and the mass ratio of the amino chain extender E-100 to the amino chain extender 6200 is 1 (1.5-2).
6. The polyurea coating of claim 5, wherein the amount of material of the isocyanate is n1, the sum of the amounts of material of the amino terminated polyether, the amino chain extender E-100, and the amino chain extender 6200 is n2, and n1 and n2 satisfy the relationship: n1: n2 is 1.01-1.08: 1.
7. The polyurea coating according to claim 1 or 2, wherein the physical properties of the first component satisfy:
the viscosity is 800-1200 mpa.s at the temperature of 25 ℃;
the NCO index is 14.4-15%.
8. The polyurea coating according to claim 1 or 2, wherein the physical properties of the second component satisfy:
the viscosity at the temperature of 25 ℃ is 1300-1700 mpa.s;
the water content is less than or equal to 0.1 percent by mass.
9. The polyurea coating of claim 1, wherein the mass ratio of the first component to the second component is 1.05: 1; or
The volume ratio of the first component to the second component is 1:1.
10. A method for preparing the polyurea coating according to any one of claims 1 to 9, comprising the steps of:
chemically reacting the polyether polyol with the isocyanate to obtain the first component;
and mixing 40-60 parts of the amino-terminated polyether, 15-20 parts of modified resin and 20-40 parts of the amino chain extender, and dehydrating to obtain the second component.
CN202210692829.7A 2022-06-17 2022-06-17 Polyurea coating and preparation method thereof Pending CN114854293A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202210692829.7A CN114854293A (en) 2022-06-17 2022-06-17 Polyurea coating and preparation method thereof
PCT/CN2022/137275 WO2023240945A1 (en) 2022-06-17 2022-12-07 Polyurea coating and preparation method therefor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210692829.7A CN114854293A (en) 2022-06-17 2022-06-17 Polyurea coating and preparation method thereof

Publications (1)

Publication Number Publication Date
CN114854293A true CN114854293A (en) 2022-08-05

Family

ID=82625935

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210692829.7A Pending CN114854293A (en) 2022-06-17 2022-06-17 Polyurea coating and preparation method thereof

Country Status (2)

Country Link
CN (1) CN114854293A (en)
WO (1) WO2023240945A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116333573A (en) * 2023-02-16 2023-06-27 盾鼎防水科技有限公司 Bio-based rigid polyurea waterproof coating
WO2023240945A1 (en) * 2022-06-17 2023-12-21 中车株洲车辆有限公司 Polyurea coating and preparation method therefor

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107903803A (en) * 2017-11-27 2018-04-13 烟台市顺达聚氨酯有限责任公司 A kind of freezer high water vapor rejection polyurethane coating and preparation method thereof
CN108129980A (en) * 2017-12-26 2018-06-08 株洲市九华新材料涂装实业有限公司 A kind of city rail vehicle super branched polyurethane finishing coat
CN108178812A (en) * 2017-12-30 2018-06-19 浙江工业大学 A kind of fluorinated silicone modified acrylic resin and its preparation and application
CN109251645A (en) * 2018-09-11 2019-01-22 中车长江车辆有限公司 A kind of spray polyurea elastomer anticorrosive paint and preparation method thereof
CN111690319A (en) * 2020-07-01 2020-09-22 江苏瑞腾涂装科技有限公司 Novel automatically cleaning plastic-coated steel pipe
KR102304986B1 (en) * 2021-04-14 2021-09-24 김학봉 Polyurea coating waterproofing material with excellent waterproofing and durability, and its manufacturing method
CN114410175A (en) * 2021-12-11 2022-04-29 东来涂料技术（上海）股份有限公司 High-wear-resistance coating for automotive interior parts and preparation method thereof

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5162388A (en) * 1991-06-04 1992-11-10 Texaco Chemical Company Aliphatic polyurea elastomers
CN101818019A (en) * 2009-02-26 2010-09-01 北京东方雨虹防水技术股份有限公司 Spray polyurea high-performance waterproof paint and preparation method thereof
CN102993930A (en) * 2012-09-29 2013-03-27 北京东方雨虹防水技术股份有限公司 Highly-heat-resistant spray polyurea elastic coating and preparation method for same
CN103214921A (en) * 2013-04-17 2013-07-24 北京东方雨虹防水技术股份有限公司 Reflective heat insulation spray-polyurea elastic coating and preparation method thereof
CN103804689B (en) * 2014-02-27 2017-01-04 湖北大学 A kind of silicone oligomer of the special resistance to anti-soil of polyureas and preparation method thereof
US9714363B2 (en) * 2014-12-23 2017-07-25 Super Skin Systems, Inc. Silicone polyurea
CN105968285A (en) * 2016-06-02 2016-09-28 深圳市深赛尔股份有限公司 Waterborne silane polyurea resin and preparation method thereof
CN106010175B (en) * 2016-07-05 2018-02-23 江苏苏博特新材料股份有限公司 A kind of preparation method and applications of bridge anti-freezing ice type two-component polyurea water-repellent paint
CN109944216B (en) * 2018-12-26 2020-12-25 新疆万华昌兴节能科技有限责任公司 Preparation method of anti-icing coating
CN112210277A (en) * 2019-07-12 2021-01-12 常州市大使涂料有限公司 Polyurea composite layer tensile waterproof coating
CN111410900A (en) * 2019-12-20 2020-07-14 北京科汇科技股份有限公司 Environment-friendly polyurea composition antifouling anticorrosive paint
CN112794975A (en) * 2021-01-14 2021-05-14 青岛爱尔家佳新材料股份有限公司 Organic silicon modified polyurea for ocean non-toxic antifouling and preparation method thereof
CN113004777B (en) * 2021-02-03 2022-03-15 中山大学 Polyurea coating, coating and preparation method thereof
CN114854293A (en) * 2022-06-17 2022-08-05 中车株洲车辆有限公司 Polyurea coating and preparation method thereof

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107903803A (en) * 2017-11-27 2018-04-13 烟台市顺达聚氨酯有限责任公司 A kind of freezer high water vapor rejection polyurethane coating and preparation method thereof
CN108129980A (en) * 2017-12-26 2018-06-08 株洲市九华新材料涂装实业有限公司 A kind of city rail vehicle super branched polyurethane finishing coat
CN108178812A (en) * 2017-12-30 2018-06-19 浙江工业大学 A kind of fluorinated silicone modified acrylic resin and its preparation and application
CN109251645A (en) * 2018-09-11 2019-01-22 中车长江车辆有限公司 A kind of spray polyurea elastomer anticorrosive paint and preparation method thereof
CN111690319A (en) * 2020-07-01 2020-09-22 江苏瑞腾涂装科技有限公司 Novel automatically cleaning plastic-coated steel pipe
KR102304986B1 (en) * 2021-04-14 2021-09-24 김학봉 Polyurea coating waterproofing material with excellent waterproofing and durability, and its manufacturing method
CN114410175A (en) * 2021-12-11 2022-04-29 东来涂料技术（上海）股份有限公司 High-wear-resistance coating for automotive interior parts and preparation method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023240945A1 (en) * 2022-06-17 2023-12-21 中车株洲车辆有限公司 Polyurea coating and preparation method therefor
CN116333573A (en) * 2023-02-16 2023-06-27 盾鼎防水科技有限公司 Bio-based rigid polyurea waterproof coating

Also Published As

Publication number Publication date
WO2023240945A1 (en) 2023-12-21

Similar Documents

Publication Publication Date Title
CN114854293A (en) Polyurea coating and preparation method thereof
US4400498A (en) Thermoplastic polyurethane resins
CA1216589A (en) Isocyanate-terminated prepolymers with low free monomer contents
CA1103827A (en) Cationic electrolyte-stable dispersions and process for producing polyurethanes useful therein
DE19547448C2 (en) Abrasion-resistant coating compositions based on fluorinated alcohols
CN110229301B (en) Preparation method and application of waterborne polyurethane resin synthetic leather
US20030027921A1 (en) Nonaqueous thermosetting two-component coating composition
CN109251645B (en) Spray polyurea elastic anticorrosive paint and preparation method thereof
TW201125885A (en) Coating compositions for glass substrates
IL145213A (en) Polyurethane solutions containing alkoxysilane structural units
CN105026450A (en) One-component moisture-curable composition
CN111909346B (en) Preparation of aqueous high-temperature self-crosslinking polyurethane dispersions
CN110204740A (en) From delustring polyurethane aqueous dispersion body
CN111019507B (en) High-strength waterborne polyurethane/cellulose nano composite emulsion and preparation method thereof
JP6171302B2 (en) Urethane adhesive composition
CN106560498A (en) Urethane Adhesive Composition
US4569961A (en) Polyurethane lacquers containing nitroso-aromatics
CA2018885C (en) A moisture-hardening coating composition and method for its production
CN113861829A (en) Nano SiO2Modified super-hydrophobic acrylic polyurethane varnish and preparation method thereof
KR20150144875A (en) Polyurea paint
CN114989707B (en) Polyurea coatings
US6253505B1 (en) Iron-oxide-containing one or two-component polyurethane paint for coating elastomers, its production and use
EP4039763A1 (en) Adhesive composition and rubber reinforcing material
CN112646109A (en) Polyphenylene sulfide ketone modified polyurethane aqueous resin and preparation method thereof
CN113667117A (en) Preparation method of water-soluble polyaniline, water-soluble polyaniline-containing high-temperature conductive primer for glass fiber reinforced plastics and preparation method of water-soluble polyaniline-containing water-soluble high-temperature conductive primer

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20220805