CN112080244A - High-strength and fast-curing one-component primer-free polyurethane sealant and preparation method thereof - Google Patents
High-strength and fast-curing one-component primer-free polyurethane sealant and preparation method thereof Download PDFInfo
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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
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
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- C09J175/08—Polyurethanes from polyethers
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
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- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
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- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
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- C08G18/4825—Polyethers containing two hydroxy groups
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- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
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- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
- C08G18/7657—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings
- C08G18/7664—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups
- C08G18/7671—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups containing only one alkylene bisphenyl group
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- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
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- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
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- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
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Abstract
The invention provides a high-strength and fast-curing one-component primer-free polyurethane sealant and a preparation method thereof, wherein the polyurethane sealant comprises the following components in parts by weight: 25-45 parts of polyurethane prepolymer, 20-30 parts of plasticizer, 0-10 parts of filler, 30-50 parts of nano calcium carbonate, 0.2-2 parts of water absorbent, 1-4 parts of synthetic coupling agent and 0.01-1 part of catalyst a; the synthetic coupling agent is prepared by reacting isocyanate b and silane; the silane is selected from secondary aminosilanes and/or mercaptosilanes. The sealant adopts the combined action of the synthetic coupling agent and other components, meets the primer-free adhesion of various base materials under the condition of not reducing the strength of the polyurethane sealant, and has higher strength and quick curing performance.
Description
Technical Field
The invention belongs to the technical field of single-component polyurethane adhesives, and particularly relates to a high-strength and fast-curing single-component primer-free polyurethane sealant and a preparation method thereof.
Background
The single-component polyurethane sealant is a polyurethane adhesive which takes a polymer blocked by an isocyanate (NCO) group as a main effective component and is matched with a plasticizer, a filler, a catalyst and an auxiliary agent.
Polyurethane sealants are widely used as caulking sealing materials for buildings, squares and roads, and for sealing automobiles, glass installations, electronic tanks, submarines, rockets and the like.
At present, the existing polyurethane sealant needs to be primed on many occasions, which severely limits the application range of the sealant.
Disclosure of Invention
In view of the above, the invention aims to provide a high-strength and fast-curing one-component primer-free polyurethane sealant and a preparation method thereof, wherein the sealant can meet the primer-free adhesion of various substrates under the condition of not reducing the strength of the polyurethane sealant.
The invention provides a high-strength and fast-curing single-component primer-free polyurethane sealant which comprises the following preparation raw materials in parts by weight:
25-45 parts of polyurethane prepolymer, 10-30 parts of plasticizer, 0-10 parts of filler, 30-50 parts of nano calcium carbonate, 0.2-2 parts of water absorbent, 1-4 parts of synthetic coupling agent and 0.01-1 part of catalyst a;
the synthetic coupling agent is prepared by reacting isocyanate b and silane; the silane is selected from secondary aminosilanes and/or mercaptosilanes.
Preferably, the secondary aminosilane is selected from one or more of bis- (gamma-trimethoxysilylpropyl) amine, N-phenyl-gamma-aminopropyltrimethoxysilane, N-phenyl-gamma-aminopropyltriethoxysilane, N-butyl-gamma-aminopropyltrimethoxysilane, N-butyl-gamma-aminopropyltriethoxysilane, N-ethyl-3-aminopropyltrimethoxysilane and N-ethyl-3-aminopropyltriethoxysilane;
the mercaptosilane is selected from gamma-mercaptopropyltrimethoxysilane and/or gamma-mercaptopropyltriethoxysilane.
Preferably, the isocyanate b is selected from one or more of toluene diisocyanate, diphenylmethane diisocyanate, isophorone diisocyanate, hexamethylene diisocyanate, xylylene diisocyanate, dicyclohexylmethane diisocyanate, toluene diisocyanate trimer, isophorone diisocyanate trimer, and hexamethylene diisocyanate trimer. .
Preferably, the molar ratio of the isocyanate b to the silane is 1: 0.8-2.0;
the reaction temperature is 50-70 ℃, and the reaction time is 1-4 h.
Preferably, the water absorbent is selected from one or more of alkyl sulfonic acid isocyanate, calcium oxide and molecular sieve;
the filler is selected from one or more of ground silica, ground calcium carbonate, talcum powder, clay, organic bentonite, hydrogenated castor oil and barium sulfate;
the catalyst a is selected from one or more of tertiary amine catalyst, organic tin catalyst and organic bismuth catalyst;
the plasticizer is selected from one or more of alkyl sulfonate, phthalate, cyclohexane dicarboxylate, phosphate triester and citrate triester.
Preferably, the polyurethane prepolymer is prepared by reacting polyether polyol, isocyanate a and a catalyst b in a mass ratio of 100: 5-20: 0.01-0.05;
the polyether polyol is selected from polyether triol with the molecular weight of 3000-6000 and/or polyether diol with the molecular weight of 1000-4000;
the isocyanate a is selected from one or more of toluene diisocyanate, diphenylmethane diisocyanate, 1, 4-phenylene diisocyanate, polymethylene polyphenylene polyisocyanate, xylylene diisocyanate, tetramethylxylylene diisocyanate, tolidine diisocyanate, 1, 5-naphthalene diisocyanate, triphenylmethane triisocyanate, hexamethylene diisocyanate, trimethylhexamethylene diisocyanate, lysine diisocyanate, norbornane diisocyanate, trans-cyclohexane-1, 4-diisocyanate, isophorone diisocyanate, bis (isocyanatomethyl) cyclohexane and dicyclohexylmethane diisocyanate.
Preferably, the nano calcium carbonate is selected from one or more of fatty acid coated nano calcium carbonate, titanate coated nano calcium carbonate, aluminate coated nano calcium carbonate, silane coated nano calcium carbonate and acrylate coated nano calcium carbonate.
Preferably, the NCO mass content in the polyurethane prepolymer is 2.20-2.61%.
The invention provides a preparation method of a single-component primer-free polyurethane sealant, which adopts the technical scheme and comprises the following steps:
and uniformly mixing the polyurethane prepolymer, the plasticizer, the water absorbent, the filler and the nano calcium carbonate under a vacuum condition, adding the synthetic coupling agent and the catalyst a, and uniformly stirring to obtain the high-strength and fast-curing one-component primer-free polyurethane sealant.
The invention provides a high-strength and fast-curing single-component primer-free polyurethane sealant which comprises the following preparation raw materials in parts by weight: 25-45 parts of polyurethane prepolymer, 20-30 parts of plasticizer, 0-10 parts of filler, 30-50 parts of nano calcium carbonate, 0.2-2 parts of water absorbent, 1-4 parts of synthetic coupling agent and 0.01-1 part of catalyst a; the synthetic coupling agent is prepared by reacting isocyanate b and silane; the silane is selected from secondary aminosilanes and/or mercaptosilanes. The sealant adopts the combined action of the synthetic coupling agent and other components, meets the primer-free adhesion of various base materials under the condition of not reducing the strength of the polyurethane sealant, and has higher strength and quick curing performance.
Detailed Description
The invention provides a high-strength and fast-curing single-component primer-free polyurethane sealant which comprises the following preparation raw materials in parts by weight:
25-45 parts of polyurethane prepolymer, 10-30 parts of plasticizer, 0-10 parts of filler, 30-50 parts of nano calcium carbonate, 0.2-2 parts of water absorbent, 1-4 parts of synthetic coupling agent and 0.01-1 part of catalyst a;
the synthetic coupling agent is prepared by reacting isocyanate b and silane; the silane is selected from secondary aminosilanes and/or mercaptosilanes.
The single-component primer-free polyurethane sealant provided by the invention comprises 25-45 parts of polyurethane prepolymer; in specific examples, the polyurethane prepolymer is used in an amount of 25 parts, 35 parts, or 45 parts. The polyurethane adhesive is prepared by reacting polyether polyol, isocyanate a and a catalyst b in a mass ratio of 100: 5-20: 0.01-0.05; the polyether polyol is selected from polyether triol with the molecular weight of 3000-6000 and the hydroxyl value of 28-56 mgKOH/g and/or polyether diol with the molecular weight of 1000-4000 and the hydroxyl value of 28-112 mgKOH/g; the polyether polyol is more preferably selected from the group consisting of polyether triol having a molecular weight of 5000, polyether triol having a molecular weight of 6000 and polyether diol having a molecular weight of 2000.
The isocyanate a is preferably selected from one or more of Toluene Diisocyanate (TDI), diphenylmethane diisocyanate (MDI), 1, 4-phenylene diisocyanate, polymethylene polyphenylene polyisocyanate, Xylylene Diisocyanate (XDI), tetramethylxylylene diisocyanate (TMXDI), tolidine diisocyanate (TODI), 1, 5-Naphthalene Diisocyanate (NDI), triphenylmethane triisocyanate, Hexamethylene Diisocyanate (HDI), trimethylhexamethylene diisocyanate (TMHDI), lysine diisocyanate, norbornane diisocyanate (NBDI), trans-cyclohexane-1, 4-diisocyanate, isophorone diisocyanate (IPDI), bis (isocyanatomethyl) cyclohexane (H6XDI) and dicyclohexylmethane diisocyanate (H12MDI), more preferably selected from diphenylmethane diisocyanate; the diphenylmethane diisocyanate is selected from 4,4 '-MDI and/or 2, 4' -MDI. In a particular embodiment, the isocyanate a is preferably selected from 4, 4' -MDI.
The catalyst b is preferably selected from one or more of dioctyltin dilaurate, dibutyltin dilaurate, dimethyltin dilaurate, stannous octoate, butyltin oxide, and octyltin oxide, and more preferably from one or more of dibutyltin dilaurate, butyltin oxide, and dioctyltin dilaurate.
The mass content of NCO in the polyurethane prepolymer is 2.20-2.61%; in particular embodiments, the NCO mass content is 2.20%, 2.23%, or 2.61%.
The single-component primer-free polyurethane sealant provided by the invention comprises 10-30 parts of a plasticizer; in specific embodiments, the plasticizer is used in an amount of 20 parts, 25 parts, or 30 parts. The plasticizer is preferably selected from one or more of alkyl sulfonates, phthalates, cyclohexanedicarboxylates, phosphate triesters, and citrate triesters, more preferably from phthalates and/or cyclohexanedicarboxylates. The phthalate is preferably diisononyl phthalate and/or diisodecyl phthalate. In a specific embodiment, the plasticizer is DIDP.
The single-component primer-free polyurethane sealant provided by the invention comprises 0-10 parts of filler; in particular embodiments, the filler is used in an amount of 0 parts, 5 parts, or 10 parts. The filler is preferably selected from one or more of ground silica, ground calcium carbonate, talc, clay, organobentonite, hydrogenated castor oil and barium sulphate; more preferably from ground calcium carbonate. In the specific embodiment, the heavy calcium carbonate is of the type
2。
The single-component primer-free polyurethane sealant provided by the invention comprises 30-50 parts of nano calcium carbonate as a raw material; in specific embodiments, the amount of the nano calcium carbonate is 50 parts, 40 parts or 30 parts. What is needed isOne or more of the fatty acid coated nano calcium carbonate, titanate coated nano calcium carbonate, aluminate coated nano calcium carbonate, silane coated nano calcium carbonate and acrylate coated nano calcium carbonate are preferably selected from silane coated nano calcium carbonate. The silane-coated nano calcium carbonate is selected from
SPM and/or
500。
The single-component primer-free polyurethane sealant provided by the invention comprises 0.2-2 parts of water absorbent; in specific examples, the water absorbing agent is used in an amount of 0.2 parts, 0.5 parts, 1 part or 2 parts. The water absorbent is preferably selected from one or more of alkyl sulfonic acid isocyanate, calcium oxide and molecular sieve; more preferably from calcium oxide.
The single-component primer-free polyurethane sealant provided by the invention comprises 1-4 parts of synthetic coupling agent; in specific embodiments, the synthetic coupling agent is used in an amount of 1 part, 2 parts, or 4 parts. The synthetic coupling agent is prepared by reacting isocyanate b and silane; the silane is selected from secondary aminosilane and/or mercaptosilane; the secondary aminosilane is selected from one or more of bis- (gamma-trimethoxysilylpropyl) amine, N-phenyl-gamma-aminopropyltrimethoxysilane, N-phenyl-gamma-aminopropyltriethoxysilane, N-butyl-gamma-aminopropyltrimethoxysilane, N-butyl-gamma-aminopropyltriethoxysilane, N-ethyl-3-aminopropyltrimethoxysilane and N-ethyl-3-aminopropyltriethoxysilane; the mercaptosilane is selected from gamma-mercaptopropyltrimethoxysilane and/or gamma-mercaptopropyltriethoxysilane. The isocyanate b is preferably selected from one or more of toluene diisocyanate, diphenylmethane diisocyanate, isophorone diisocyanate, hexamethylene diisocyanate, xylylene diisocyanate, dicyclohexylmethane diisocyanate, toluene diisocyanate trimer, isophorone diisocyanate trimer, and hexamethylene diisocyanate trimer. In the invention, the molar ratio of the isocyanate b to the silane is 1: 0.8-2.0; the reaction temperature is 50-70 ℃, and the reaction time is 1-4 h. In a specific embodiment, the isocyanate b is a TDI trimer and/or an HDI trimer; the silane is N-phenyl-gamma-aminopropyltrimethoxysilane and/or gamma-mercaptopropyltrimethoxysilane. The molar ratio of the isocyanate b to the silane is 1:1.0 or 1: 2.0; the reaction time is 1h or 4 h; the temperature of the reaction is 50 ℃ or 70 ℃.
The raw materials for preparing the single-component primer-free polyurethane sealant comprise 0.01-1 part of catalyst a. The catalyst a is selected from one or more of tertiary amine catalyst, organic tin catalyst and organic bismuth catalyst. In a specific embodiment, the amine catalyst is dimorpholinodiethyl ether; the tin catalyst is dibutyltin dilaurate.
The invention provides a preparation method of a single-component primer-free polyurethane sealant, which adopts the technical scheme and comprises the following steps:
and uniformly mixing the polyurethane prepolymer, the plasticizer, the water absorbent, the filler and the nano calcium carbonate under a vacuum condition, adding the synthetic coupling agent and the catalyst a, and uniformly stirring to obtain the high-strength and fast-curing one-component primer-free polyurethane sealant.
In the present invention, the polyurethane prepolymer is preferably prepared according to the following method:
the polyether polyol, the isocyanate a and the catalyst b are reacted according to the mass ratio of 100: 5-20: 0.01-0.05 to obtain the polyurethane material.
The polyether polyol is preferably heated to 110-130 ℃ for dehydration for 2h, then cooled to 50 ℃, added with isocyanate a and a catalyst b, heated to 75-90 ℃, stirred for reaction for 2-6 h, and cooled to below 50 ℃ after the-NCO content reaches a set value, so as to obtain the polyurethane prepolymer.
The plasticizer is preferably dehydrated for 2 hours in vacuum at the temperature of 110-130 ℃ for standby;
the filler and the nano calcium carbonate are preferably dried in vacuum at 120 ℃ for 24 hours until the water content is 1500ppm for later use.
The vacuum degree adopted under the vacuum condition is not lower than 980 mbar.
The invention adopts the following method to test the performance of the polyurethane sealant:
curing speed: testing according to the specification of HG/T3263-;
tensile strength: testing was performed as specified in GB/T528-2009;
substrate adhesion: testing was performed as specified in HG/T3263-;
for further illustration of the present invention, the following examples are provided to describe the high strength, fast curing one-component primer-free polyurethane sealant and the preparation method thereof in detail, but they should not be construed as limiting the scope of the present invention.
Preparatory example 1
1000g of polyether triol (average molecular weight 5000) and 500g of polyether diol (average molecular weight 2000) were heated to 130 ℃ to dehydrate for 2 hours, then cooled to 50 ℃ and 255g of 4,4 '-diisocyanatophenylmethane (4, 4' -MDI) (in this case, NCO/OH is 1.8) and 0.15g of dibutyltin dilaurate were added, and after mixing, the temperature was raised to 90 ℃ to react for 3 hours, thereby obtaining a polyurethane prepolymer a1 having an NCO% content of 2.20%.
The polyether triol (average molecular weight 5000)1000g and the polyether diol (average molecular weight 2000)500g are heated to 130 ℃ for dehydration for 2 hours, then cooled to 50 ℃, 275g of 4,4 '-diisocyanatophenylmethane (4, 4' -MDI) (NCO/OH is 2.0) and 0.45g of butyl tin oxide are added, mixed and heated to 75 ℃ for reaction for 5 hours, and the polyurethane prepolymer A2 with the NCO% content of 2.61 is obtained.
1500g of polyether triol (average molecular weight 6000) are heated to 130 ℃ for dehydration for 2 hours, then the temperature is reduced to 50 ℃, 227g of 4,4 '-diisocyanatophenylmethane (4, 4' -MDI) (NCO/OH 2.2 in this case) and 0.82g of dioctyltin dilaurate are added, and after mixing, the temperature is raised to 80 ℃ for reaction for 4 hours, so that a polyurethane prepolymer A3 with the NCO% content of 2.23% is obtained.
And reacting the TDI tripolymer with N-phenyl-gamma-aminopropyltrimethoxysilane at the molar ratio of 1:1.0 at 50 ℃ for 1h to obtain the synthetic coupling agent B1.
HDI tripolymer and gamma-mercaptopropyltrimethoxysilane are reacted for 4 hours at 70 ℃ according to the molar ratio of 1:2.0 to obtain the synthetic coupling agent B2.
Examples 1 to 6
And (2) adding the plasticizer, the water removing agent, the dried filler and the nano calcium carbonate after the polyurethane prepolymer is dehydrated into a planetary mixer according to a certain proportion, uniformly mixing under a vacuum condition, wherein the vacuum degree is not lower than 980mbar, then adding the synthetic coupling agent and the catalyst a, and uniformly stirring to obtain the high-strength and fast-curing one-component primer-free polyurethane sealant.
Comparative examples 1 to 2
Adding the polyurethane prepolymer A1, the dehydrated plasticizer, the dehydrated water removing agent, the dried filler and the nano calcium carbonate into a planetary mixer according to a certain proportion, uniformly mixing under a vacuum condition, wherein the vacuum degree is not lower than 980mbar, then adding the coupling agent gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane and the catalyst, and uniformly stirring to obtain the single-component polyurethane sealant.
The performance test of the raw materials and products adopted by the polyurethane sealants prepared in examples 1-6 and comparative examples 1-2 is carried out, and the results are shown in tables 1 and 2.
TABLE 1 raw material composition and Performance test results for polyurethane sealants prepared in examples 1-4
Table 2 raw material compositions and performance test results of the polyurethane sealants prepared in examples 5 to 6 and comparative examples
The embodiment of the invention provides a high-strength and fast-curing single-component primer-free polyurethane sealant, which comprises the following raw materials in parts by weight: 25-45 parts of polyurethane prepolymer, 20-30 parts of plasticizer, 0-10 parts of filler, 30-50 parts of nano calcium carbonate, 0.2-2 parts of water absorbent, 1-4 parts of synthetic coupling agent and 0.01-1 part of catalyst a; the synthetic coupling agent is prepared by reacting isocyanate b and silane; the silane is selected from secondary aminosilanes and/or mercaptosilanes. The sealant adopts the combined action of the synthetic coupling agent and other components, meets the primer-free adhesion of various base materials under the condition of not reducing the strength of the polyurethane sealant, and has higher strength and quick curing performance.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. A high-strength and fast-curing single-component primer-free polyurethane sealant comprises the following preparation raw materials in parts by weight:
25-45 parts of polyurethane prepolymer, 20-30 parts of plasticizer, 0-10 parts of filler, 30-50 parts of nano calcium carbonate, 0.2-2 parts of water absorbent, 1-4 parts of synthetic coupling agent and 0.01-1 part of catalyst a;
the synthetic coupling agent is prepared by reacting isocyanate b and silane; the silane is selected from secondary aminosilanes and/or mercaptosilanes.
2. The one-component top-coat polyurethane sealant according to claim 1, wherein the secondary aminosilane is selected from one or more of bis- (γ -trimethoxysilylpropyl) amine, N-phenyl- γ -aminopropyltrimethoxysilane, N-phenyl- γ -aminopropyltriethoxysilane, N-butyl- γ -aminopropyltrimethoxysilane, N-butyl- γ -aminopropyltriethoxysilane, N-ethyl-3-aminopropyltrimethoxysilane and N-ethyl-3-aminopropyltriethoxysilane;
the mercaptosilane is selected from gamma-mercaptopropyltrimethoxysilane and/or gamma-mercaptopropyltriethoxysilane.
3. The one-component primer-free polyurethane sealant according to claim 1, wherein the isocyanate b is selected from one or more of toluene diisocyanate, diphenylmethane diisocyanate, isophorone diisocyanate, hexamethylene diisocyanate, xylylene diisocyanate, dicyclohexylmethane diisocyanate, toluene diisocyanate trimer, isophorone diisocyanate trimer, and hexamethylene diisocyanate trimer.
4. The single-component primer-free polyurethane sealant according to claim 1, wherein the molar ratio of the isocyanate b to the silane is 1: 0.8-2.0;
the reaction temperature is 50-70 ℃, and the reaction time is 1-4 h.
5. The one-component primer-free polyurethane sealant according to claim 1, wherein the water absorbent is selected from one or more of alkyl sulfonic acid isocyanate, calcium oxide and molecular sieve;
the filler is selected from one or more of ground silica, ground calcium carbonate, talcum powder, clay, organic bentonite, hydrogenated castor oil and barium sulfate;
the catalyst a is selected from one or more of tertiary amine catalyst, organic tin catalyst and organic bismuth catalyst;
the plasticizer is selected from one or more of alkyl sulfonate, phthalate, cyclohexane dicarboxylate, phosphate triester and citrate triester.
6. The single-component primer-free polyurethane sealant according to claim 1, wherein the polyurethane prepolymer is prepared by reacting polyether polyol, isocyanate a and a catalyst b in a mass ratio of 100: 5-20: 0.01-0.05;
the polyether polyol is selected from polyether triol with the molecular weight of 3000-6000 and/or polyether diol with the molecular weight of 1000-4000;
the isocyanate a is selected from one or more of toluene diisocyanate, diphenylmethane diisocyanate, 1, 4-phenylene diisocyanate, polymethylene polyphenylene polyisocyanate, xylylene diisocyanate, tetramethylxylylene diisocyanate, tolidine diisocyanate, 1, 5-naphthalene diisocyanate, triphenylmethane triisocyanate, hexamethylene diisocyanate, trimethylhexamethylene diisocyanate, lysine diisocyanate, norbornane diisocyanate, trans-cyclohexane-1, 4-diisocyanate, isophorone diisocyanate, bis (isocyanatomethyl) cyclohexane and dicyclohexylmethane diisocyanate.
7. The single-component primer-free polyurethane sealant according to claim 1, wherein the nano calcium carbonate is one or more selected from the group consisting of fatty acid-coated nano calcium carbonate, titanate-coated nano calcium carbonate, aluminate-coated nano calcium carbonate, silane-coated nano calcium carbonate and acrylate-coated nano calcium carbonate.
8. The single-component primer-free polyurethane sealant as claimed in claim 1, wherein the NCO mass content of the polyurethane prepolymer is 2.20-2.61%.
9. A preparation method of the single-component primer-free polyurethane sealant as claimed in any one of claims 1 to 8 comprises the following steps:
and uniformly mixing the polyurethane prepolymer, the plasticizer, the water absorbent, the filler and the nano calcium carbonate under a vacuum condition, adding the synthetic coupling agent and the catalyst a, and uniformly stirring to obtain the high-strength and fast-curing one-component primer-free polyurethane sealant.
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| CN112521905A (en) * | 2020-12-16 | 2021-03-19 | 广西华纳新材料科技有限公司 | Moisture-curing polyurethane sealant and preparation method thereof |
| CN113046015A (en) * | 2021-04-30 | 2021-06-29 | 盛势达(广州)化工有限公司 | Sealant and preparation method and application thereof |
| CN113429926A (en) * | 2021-06-29 | 2021-09-24 | 东风汽车有限公司东风日产乘用车公司 | Polyurethane adhesive and preparation method and application thereof |
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