CN112940665A - Polyurea coating suitable for waterproof coiled material, preparation method thereof and waterproof material - Google Patents
Polyurea coating suitable for waterproof coiled material, preparation method thereof and waterproof material Download PDFInfo
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- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/02—Polyureas
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- 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
- C08G18/08—Processes
- C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
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- 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
- C08G18/30—Low-molecular-weight compounds
- C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
- C08G18/3225—Polyamines
- C08G18/325—Polyamines containing secondary or tertiary amino groups
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- 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
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- 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
- C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
- C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
- C08G18/6666—Compounds of group C08G18/48 or C08G18/52
- C08G18/667—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38
- C08G18/6681—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/32 or C08G18/3271 and/or polyamines of C08G18/38
- C08G18/6685—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/32 or C08G18/3271 and/or polyamines of C08G18/38 with compounds of group C08G18/3225 or polyamines of C08G18/38
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/10—Adhesives in the form of films or foils without carriers
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- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
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- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
- C09J2301/12—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers
- C09J2301/122—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present only on one side of the carrier, e.g. single-sided adhesive tape
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- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
- C09J2301/12—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers
- C09J2301/124—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present on both sides of the carrier, e.g. double-sided adhesive tape
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- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/20—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself
- C09J2301/208—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself the adhesive layer being constituted by at least two or more adjacent or superposed adhesive layers, e.g. multilayer adhesive
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Abstract
The invention discloses a polyurea coating suitable for a waterproof coiled material, which is characterized by comprising a first component and a second component, wherein the first component comprises an isocyanate polyurea prepolymer; the second component comprises amine-terminated polyether, an amine chain extender, a plasticizer and an auxiliary agent, and the weight ratio of the first component to the second component in the polyurea coating is 1: 0.2-2; the mass ratio of the amine-terminated polyether to the amine chain extender is 1: 0.5-2. The polyurea coating disclosed by the invention preferably selects an amine chain extender with a specific structure, the adaptability with the selected polyether amine is more excellent, the prepared product has high crosslinking density, the rubber body has excellent strength performance and self-healing capability, and the low-temperature flexibility, bonding strength, weather resistance and mechanical performance of the traditional polyurea coating are improved.
Description
Technical Field
The invention relates to the technical field of waterproof coiled materials, in particular to a polyurea coating suitable for a waterproof coiled material, a preparation method of the polyurea coating and a waterproof material comprising an adhesive layer prepared from the polyurea coating.
Background
In the polyurea coating in the prior art, the amine chain extender and the polyether amine have poor adaptability, and the prepared product has low crosslinking density and poor strength performance and self-healing capability.
Disclosure of Invention
In view of the above, in order to overcome the defects of the prior art, the present invention aims to provide a polyurea coating suitable for a waterproofing membrane, which is applied on the waterproofing membrane to improve the adhesion of the waterproofing membrane and the self-healing adhesive ability of the coating.
In order to achieve the purpose, the invention adopts the following technical scheme:
the polyurea coating comprises a first component and a second component, wherein the first component comprises isocyanate polyurea prepolymer; the second component comprises amine-terminated polyether, an amine chain extender, a plasticizer and an auxiliary agent, and the weight ratio of the first component to the second component in the polyurea coating is 1: 0.2-2; the mass ratio of the amine-terminated polyether to the amine chain extender is 1: 0.5-2. The first and second components are stored separately and are mixed at the time of use.
According to some preferred embodiments of the present invention, the isocyanate polyurea prepolymer is prepared from a secondary hindered amine and an isocyanate, wherein the secondary hindered amine is a compound having the following general formula:
wherein X is an alkyl group having 1 to 3 carbon atoms, and R is1、R2、R3、R4Are each a linear or branched alkyl group having 2 to 8 carbon atoms.
The cohesive strength and the permanent viscosity of the material can be improved by introducing a large number of urea bonds. The bi-component polyurea has rapid reaction, high material crosslinking density and short strength time reaching the end point, and can improve the efficiency of on-site glue preparation. It has high permeability and hydrophilicity, and can slowly permeate into various base materials, strengthen chemical and physical anchoring and raise the adhesion to various base materials.
In some preferred embodiments of the present invention, the isocyanate is selected from one, a combination of two or more of diphenylmethane diisocyanate (MDI), Toluene Diisocyanate (TDI), isophorone diisocyanate (IPDI), Hexamethylene Diisocyanate (HDI), Xylylene Diisocyanate (XDI), hydrogenated diphenylmethane diisocyanate, and the like.
According to some preferred aspects of the invention, the amine chain extender in the second component is a compound having the same formula structure as the secondary sterically hindered amine, i.e. the amine chain extender is also a compound having the following general formula:
wherein X is an alkyl group having 1 to 3 carbon atoms, and R is1、R2、R3、R4Are each a linear or branched alkyl group having 2 to 8 carbon atoms.
In some preferred embodiments of the invention, the amine chain extender may remain the same compound as the secondary hindered amine, or a different compound may be used but conforming to the general formula described above.
According to some preferred embodiments of the invention, the amino-terminated polyether is a primary amino polyether or a secondary amino polyether.
In some preferred embodiments of the present invention, the amino-terminated polyether is a primary amino polyether such as D230, D400, D2000, D4000, T403, T3000, T5000, etc. from Hensman, or a secondary amino polyether such as SD231, SD401, SD2001, etc. from Hensman.
In some preferred embodiments of the present invention, the plasticizer is selected from at least one of naphthenic oil, chlorinated paraffin, DINP (diisononyl phthalate), DIDP (diisodecyl phthalate), DOTP (dioctyl terephthalate), vegetable fat, and the like.
In some preferred embodiments of the present invention, the ratio of the amino-terminated polyether, the amine chain extender, and the plasticizer in the second component is 10% to 70% by mass.
In some preferred embodiments of the present invention, the auxiliary agent comprises conventional agents such as antifoaming agents, antioxidants, and the like, which may be selected according to the actual situation.
Wherein the defoaming agent is one or the combination of two or more of physical defoaming agents such as polysiloxane defoaming agent and/or silicone defoaming agent, and chemical defoaming agents such as calcium oxide, magnesium oxide, calcium hydroxide, oxazolidine latent curing agent and ketimine latent curing agent.
The antioxidant is one or two or more selected from 2, 6-tertiary butyl-4-methylphenol, bis (3, 5-tertiary butyl-4-hydroxyphenyl) thioether and tetra [ beta- (3, 5-tertiary butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester.
The invention also provides a preparation method of the polyurea coating, which comprises the following steps:
preparing a first component: adding isocyanate into sterically hindered secondary amine with the moisture content of below 300ppm for reaction, sampling and testing the mass fraction of NCO to reach a preset value, and finishing the reaction to obtain an isocyanate polyurea prepolymer;
preparing a second component: and mixing and dehydrating the amino-terminated polyether, the amine chain extender and the plasticizer until the moisture content is below 300ppm, adding the auxiliary agent, and uniformly stirring to obtain the second component.
According to some preferred embodiments of the present invention, in the step of preparing the isocyanate polyurea prepolymer, the preset value of the mass fraction of NCO of the reaction system is 1 to 5%.
According to some preferred embodiments of the present invention, the dehydration temperature for the preparation of the isocyanate polyurea prepolymer and the second component is 115-130 ℃. In some preferred embodiments of the invention, the dehydration temperature is preferably 120 ℃.
In some embodiments of the present invention, a method of preparing a polyurea coating includes the steps of:
1) preparation of the first component
Dehydrating sterically hindered secondary amine at 120 ℃ until the water content is below 300ppm, then dropwise adding isocyanate, reacting for 2-4h at 70-100 ℃, sampling to test that the mass fraction of NCO reaches a preset value, and finishing the reaction to obtain the isocyanate polyurea prepolymer.
2) Preparation of the second component
Dehydrating the amine-terminated polyether, the amine chain extender and the plasticizer at 120 ℃ until the water content is below 300ppm, then cooling to 55 ℃, adding the auxiliary agent, the color paste and the like, stirring uniformly, and defoaming for 30min to obtain the second component. And (4) sealing and storing the second component in dark.
For convenience of description and understanding, the steps are distinguished and numbered, and in actual preparation, the steps such as the preparation of the isocyanate polyurea prepolymer in the first component and the preparation of the second component can be carried out simultaneously or sequentially.
The invention also provides a waterproof material which comprises a substrate, an anti-sticking layer and an adhesive layer for bonding the substrate and the anti-sticking layer, wherein the adhesive layer is prepared from the polyurea coating. The polyurea coating is used on the waterproof coiled material, so that the cohesiveness of the waterproof material and the self-healing adhesive holding capacity of the coating can be improved.
According to some preferred embodiments of the present invention, the waterproof material is prepared by mixing and reacting a first component and a second component, applying the mixture onto the substrate, covering a release layer on the applied polyurea coating, and heating the whole to obtain the waterproof roll. Specifically, a first component and a second component are added into a reaction kettle and react for 1-3 hours at 20-60 ℃, after materials are fully reacted, the temperature is increased to 180 ℃, the viscosity of the coating is reduced, the coating is coated on a substrate through a coater or naturally flows to the substrate to be uniformly spread, an anti-sticking layer is covered on the coated polyurea coating, then the polyurea coating is put into a drying oven to be heated, and other structural layers are attached after heating and shaping, so that the finished coiled material can be formed.
In some preferred embodiments of the present invention, the substrate may be a tire base or another release layer, and the tire base is a PET polyester film, a cross laminated film PE film, a PVC sheet, a PE sheet, a TPO sheet, a composite sheet, a polyester non-woven tire base, a fiberglass tire, a copper tire base, or the like.
In some preferred embodiments of the present invention, the anti-adhesion layer may be natural sand, machine-made sand or other fine powder, a silicone oil film, an emulsion, or the like.
In some embodiments of the invention, when the substrate is a release layer, the waterproofing material is free of a matrix, in its simplest form with a polyurea tie layer formed between two release layers using the polyurea coating described above.
In some preferred embodiments of the present invention, other adhesive layers may be disposed between the tire base and the release layer in addition to the adhesive layer made of polyurea paint; other adhesive layers can be asphalt glue, epoxy glue, butyl glue, hot-melt pressure-sensitive glue, polyurethane glue and other glue materials.
Compared with the prior art, the invention has the advantages that: the polyurea coating disclosed by the invention preferably selects an amine chain extender with a specific structure, the adaptability with the selected polyether amine is more excellent, the prepared product has high crosslinking density, the rubber body has excellent strength performance and self-healing capability, and the low-temperature flexibility, bonding strength, weather resistance and mechanical performance of the traditional polyurea coating are improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic sectional view of a waterproof material according to preferred embodiment 1 of the present invention;
FIG. 2 is a schematic sectional view of a waterproof material according to preferred embodiment 2 of the present invention;
FIG. 3 is a schematic sectional view of a waterproof material according to preferred embodiment 3 of the present invention;
FIG. 4 is a schematic sectional view of a waterproof material according to preferred embodiment 4 of the present invention;
FIG. 5 is a schematic sectional view of a waterproof material according to preferred embodiment 5 of the present invention;
FIG. 6 is a schematic sectional view of a waterproof material according to preferred embodiment 6 of the present invention;
FIG. 7 is a schematic sectional view of a waterproof material according to preferred embodiment 7 of the present invention;
fig. 8 is a schematic sectional view of a waterproof material according to preferred embodiment 8 of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not a whole embodiment. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The polyurea coating in this example includes a first component and a second component in a weight ratio of 1: 2.
The first component comprises isocyanate polyurea prepolymer; the second component comprises amine-terminated polyether, amine chain extender, plasticizer, color paste, antioxidant and defoaming agent.
The preparation method of the polyurea coating in the embodiment comprises the following steps:
1) preparation of the first component
Preparing an isocyanate polyurea prepolymer: dehydrating 200g of hindered secondary amine at 120 ℃ until the water content is below 300ppm, then dropwise adding 200g of diphenylmethane diisocyanate, reacting for 3 hours at 80 ℃, sampling and testing the NCO mass fraction to reach a preset value of 5%, and finishing the reaction to obtain the isocyanate polyurea prepolymer.
The secondary sterically hindered amine in this example is a compound of the formula:
wherein X is-CH2-，R1、R2、R3、R4is-CH2CH3。
2) Preparation of the second component
And (3) dehydrating 150g of amine-terminated polyether, 150g of amine chain extender and 198g of plasticizer at 120 ℃ until the water content is below 300ppm, then cooling to 55 ℃, adding 1g of antioxidant, 0.5g of defoaming agent and 0.5g of color paste, uniformly stirring and defoaming for 30min to obtain a second component. And (4) sealing and storing the second component in dark.
In this example, the amino-terminated polyether in the second component was D230 primary amino polyether from hensman, and the amine chain extender was a compound having the same structural formula as the hindered secondary amine.
Example 2
The polyurea coating in this example includes a first component and a second component in a weight ratio of 1: 0.5.
The first component comprises isocyanate polyurea prepolymer; the second component comprises amine-terminated polyether, amine chain extender, plasticizer, color paste, antioxidant and defoaming agent.
The preparation method of the polyurea coating in the embodiment comprises the following steps:
1) preparation of the first component
Preparing an isocyanate polyurea prepolymer: dehydrating 200g of hindered secondary amine at 120 ℃ until the water content is below 300ppm, then dropwise adding 200g of toluene diisocyanate, reacting for 3 hours at 80 ℃, sampling and testing the NCO mass fraction to reach a preset value of 2%, and finishing the reaction to obtain the isocyanate polyurea prepolymer.
The secondary sterically hindered amine in this example is a compound of the formula:
wherein X is-CH2CH2CH2-，R1、R2、R3、R4Is CH3CH2C(CH3)CH(CH3)CH2CH3。
2) Preparation of the second component
200g of amine-terminated polyether, 100g of amine chain extender and 198g of plasticizer are dehydrated at 120 ℃ until the water content is below 300ppm, then the temperature is reduced to 55 ℃, 1g of antioxidant, 0.5g of defoaming agent and 0.5g of color paste are added, the mixture is stirred uniformly and defoamed for 30min to obtain a second component. And (4) sealing and storing the second component in dark.
In this example, the amino-terminated polyether in the second component was a T3000 primary amino polyether from hensman, and the amine chain extender was a compound of the same formula as the sterically hindered secondary amine.
Example 3
Referring to fig. 1, the waterproof material in this embodiment sequentially includes, from top to bottom, a first anti-sticking layer, a first polyurea bonding layer, a base, a second polyurea bonding layer, and a second anti-sticking layer. The first polyurea bonding layer and the second polyurea bonding layer are formed from the polyurea coating preparation of examples 1-2.
When the waterproof coiled material is prepared, the first component and the second component are added into a reaction kettle, the reaction is carried out naturally for 2 hours at 40 ℃, after the materials are fully reacted, the temperature is increased to 180 ℃, the viscosity of the coating is reduced, the coating is coated on a substrate through a coater, an anti-sticking layer is covered on the coated polyurea coating, then the polyurea coating enters an oven, and the finished coiled material can be formed after heating and curing.
The base member in this embodiment is the TPO sheet, and first antiseized layer and second antiseized layer are the silicon oil film. In other embodiments, the substrate may be a tire base or another release layer, the tire base being a PET polyester film, a cross laminated film PE film, a PVC sheet, a PE sheet, a TPO sheet, a composite sheet, a polyester non-woven tire base, a fiberglass tire, a copper tire base, a composite tire base, or the like; the anti-sticking layer can be natural sand, machine-made sand or other fine powder, silicon oil film, emulsion, etc.
In other embodiments, if the second polyurea bonding layer and the second release layer are removed, a water repellent material having a structure as shown in fig. 2 is formed.
In another embodiment of the present application, as shown in fig. 3, the waterproofing material is devoid of a base and has a polyurea bonding layer formed from a polyurea coating material between two release layers. As shown in fig. 8, other adhesive layers are further provided between the polyurea adhesive layer and the anti-sticking layer, the other adhesive layers can be asphalt glue, epoxy glue, butyl glue, hot-melt pressure-sensitive glue, polyurethane glue and other glue materials, and no tire base exists in the whole waterproof material.
In another embodiment of the present application, as shown in fig. 4 and 5, there is another bonding layer between the tire base and the polyurea bonding layer, and the other bonding layer can be asphalt glue, epoxy glue, butyl glue, hot melt pressure sensitive glue, polyurethane glue, etc.
In another embodiment of the present application, as shown in fig. 6 and 7, there is another adhesive layer between the polyurea adhesive layer and the release layer, and the other adhesive layer can be asphalt glue, epoxy glue, butyl glue, hot melt pressure sensitive glue, polyurethane glue, etc.
Comparative example 1
The polyurea coating in the comparative example is different from that in example 1 in that the second component only contains the amino-terminated polyether and does not contain the amine chain extender, the content of the amine chain extender is replaced by the amino-terminated polyether, and other components are the same as those in example 1.
Comparative example 2
The polyurea coating in the comparative example is different from the polyurea coating in example 1 in that the second component only contains the amine chain extender and does not contain the amine-terminated polyether, the content of the amine-terminated polyether is replaced by the amine chain extender, and other components are the same as those in example 1.
Comparative example 3
This comparative example was an adhesive layer formed using a conventional hot-melt pressure-sensitive adhesive as a coating.
The manufacturing method comprises the steps of heating and melting materials such as naphthenic oil and SIS, heating to 180 ℃ to reduce the viscosity of the coating, coating the coating on a substrate through a coater, covering an anti-sticking layer on the coated polyurea coating, then feeding the polyurea coating into an oven, and forming the polyurea coating into the finished waterproof coiled material after heating and curing.
Comparative example 4
This comparative example was a bonding layer formed using a conventional polyurea coating as a coating layer. Specifically, when the isocyanate polyurea prepolymer is prepared, the steric hindrance secondary amine is replaced by polyether polyol, and then the conventional polyurea coating is prepared.
Testing and analysis
Referring to GB/T23457-2017 pre-paved waterproof coiled material and a relevant method in GB/T19250-2013 polyurethane waterproof coating standard, the coatings in examples 1-2 and comparative examples 1-4 are applied to the waterproof coiled material and subjected to a relevant performance test, and the results are shown in Table 2.
Table 1 shows the raw material formulations (in parts by mass) of the coatings in examples 1 to 2 and comparative examples 1 to 4
TABLE 2 test results of the properties of the waterproof rolls prepared from the polyurea coatings of examples 1 to 3 and comparative examples 1 to 3
As can be seen from the test data in Table 2, the relative performance of the polyurea material prepared in examples 1 and 2 applied to the waterproof roll is similar to that of the waterproof roll prepared by the conventional hot melt adhesive in certain performance; but the hot melt adhesive belongs to physical dispersion melting and non-reaction crosslinking, compared with the hot melt adhesive, polyurea belongs to reaction crosslinking, the high molecular structure is more compact, the durability is better, the extreme low temperature can be resisted, the high temperature resistance is better, and the hot melt adhesive is resistant to acid and alkali bubbles. The amine chain extender and the amino-terminated polyether need to be used together to achieve a better effect, and the single use has poor comprehensive performance; and the proportion of the amine chain extender and the amino-terminated polyether is changed to have certain influence on the adhesion of the material, and the proper proportion needs to be controlled, so that if the conventional polyurethane (comparative example 4) is adopted, the adhesion is greatly reduced, and the self-healing effect is not generated.
Compared with the prior art, the invention has the following advantages:
1. the coating formed by the polyurea coating belongs to a viscoelastic body, and is in a never-cured state like a non-cured rubber asphalt coating; the coating product has 100 percent of solid content, is safe, environment-friendly and has no pungent smell. The manufactured coiled material is environment-friendly and has no pungent smell.
2. Compared with an asphalt sizing material, the polyurea coating material has more excellent compatibility with a base material and is less prone to oil migration.
3. Compared with hot melt pressure sensitive adhesive, the adhesive has superior initial adhesion and lasting adhesion, has stronger cohesive force, and can resist the influence of high temperature on the deformation of the tire base.
4. The polyurea coating has excellent cohesiveness and excellent self-repairing and self-healing performance.
5. The polyurea coating has excellent bonding force with a wet concrete base surface or a mortar base surface.
The above embodiments are merely illustrative of the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and implement the invention, and not to limit the scope of the invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the scope of the present invention.
Claims (10)
1. The polyurea coating suitable for the waterproof coiled material is characterized by comprising a first component and a second component, wherein the first component comprises an isocyanate polyurea prepolymer; the second component comprises amine-terminated polyether, an amine chain extender, a plasticizer and an auxiliary agent, and the weight ratio of the first component to the second component in the polyurea coating is 1: 0.2-2; the mass ratio of the amine-terminated polyether to the amine chain extender is 1: 0.5-2.
2. The polyurea coating according to claim 1, wherein the isocyanate polyurea prepolymer is prepared from a sterically hindered secondary amine and isocyanate, and the sterically hindered secondary amine is a compound having the following general formula:
wherein X is an alkyl group having 1 to 3 carbon atoms, and R is1、R2、R3、R4Are each a linear or branched alkyl group having 2 to 8 carbon atoms.
3. The polyurea coating of claim 2, wherein the amine chain extender in the second component is a compound having the general formula:
wherein X is an alkyl group having 1 to 3 carbon atoms, and R is1、R2、R3、R4Are each a linear or branched alkyl group having 2 to 8 carbon atoms.
4. The polyurea coating of claim 2, wherein the amino-terminated polyether is a primary amino polyether or a secondary amino polyether.
5. The polyurea coating according to claim 2, wherein the mass ratio of the amine-terminated polyether, the amine chain extender and the plasticizer in the second component is 10-70%.
6. A process for preparing a polyurea coating according to any one of claims 1 to 5, comprising the steps of:
preparing a first component: adding isocyanate into sterically hindered secondary amine with the moisture content of below 300ppm for reaction, sampling and testing the mass fraction of NCO to reach a preset value, and finishing the reaction to obtain an isocyanate polyurea prepolymer;
preparing a second component: and mixing and dehydrating the amino-terminated polyether, the amine chain extender and the plasticizer until the moisture content is below 300ppm, adding the auxiliary agent, and uniformly stirring to obtain the second component.
7. The method according to claim 6, wherein the predetermined value of NCO mass fraction in the reaction system in the step of preparing the isocyanate polyurea prepolymer is 1 to 5%.
8. The method as claimed in claim 6, wherein the dehydration temperature for preparing the first component and the second component is 115-130 ℃.
9. A waterproof roll characterized by comprising a base body, a release layer and an adhesive layer for bonding the base body and the release layer, wherein the adhesive layer is prepared by using the polyurea coating material according to any one of claims 1 to 5.
10. The waterproofing membrane according to claim 9, wherein the first component and the second component are mixed and reacted and then applied to the substrate, and a release layer is coated on the applied polyurea coating material, and the waterproofing membrane is obtained after the entire is heated.
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| CN202110152854.1A CN112940665B (en) | 2021-02-04 | 2021-02-04 | Polyurea coating suitable for waterproof coiled material, preparation method thereof and waterproof material |
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