CN110698969B - Polyurethane waterproof coating and preparation method thereof - Google Patents
Polyurethane waterproof coating and preparation method thereof Download PDFInfo
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- CN110698969B CN110698969B CN201910981937.4A CN201910981937A CN110698969B CN 110698969 B CN110698969 B CN 110698969B CN 201910981937 A CN201910981937 A CN 201910981937A CN 110698969 B CN110698969 B CN 110698969B
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- 238000000576 coating method Methods 0.000 title claims abstract description 48
- 239000011248 coating agent Substances 0.000 title claims abstract description 47
- 229920002635 polyurethane Polymers 0.000 title claims abstract description 40
- 239000004814 polyurethane Substances 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title claims abstract description 6
- 239000004721 Polyphenylene oxide Substances 0.000 claims abstract description 67
- 229920000570 polyether Polymers 0.000 claims abstract description 67
- 239000002994 raw material Substances 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 6
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 claims description 18
- 239000003963 antioxidant agent Substances 0.000 claims description 17
- 238000003756 stirring Methods 0.000 claims description 17
- 230000003078 antioxidant effect Effects 0.000 claims description 15
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 14
- 239000003054 catalyst Substances 0.000 claims description 14
- 230000002745 absorbent Effects 0.000 claims description 13
- 239000002250 absorbent Substances 0.000 claims description 13
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 12
- ILWKEUYNBFFCMF-UHFFFAOYSA-N 4-chloroaniline methane Chemical compound C.ClC1=CC=C(N)C=C1 ILWKEUYNBFFCMF-UHFFFAOYSA-N 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 8
- QUAMTGJKVDWJEQ-UHFFFAOYSA-N octabenzone Chemical compound OC1=CC(OCCCCCCCC)=CC=C1C(=O)C1=CC=CC=C1 QUAMTGJKVDWJEQ-UHFFFAOYSA-N 0.000 claims description 8
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 7
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 7
- 239000011701 zinc Substances 0.000 claims description 7
- 229910052725 zinc Inorganic materials 0.000 claims description 7
- 241000276489 Merlangius merlangus Species 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 229910052797 bismuth Inorganic materials 0.000 claims description 4
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 claims description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 4
- DXGLGDHPHMLXJC-UHFFFAOYSA-N oxybenzone Chemical compound OC1=CC(OC)=CC=C1C(=O)C1=CC=CC=C1 DXGLGDHPHMLXJC-UHFFFAOYSA-N 0.000 claims description 4
- GDESWOTWNNGOMW-UHFFFAOYSA-N resorcinol monobenzoate Chemical compound OC1=CC=CC(OC(=O)C=2C=CC=CC=2)=C1 GDESWOTWNNGOMW-UHFFFAOYSA-N 0.000 claims description 4
- 238000004078 waterproofing Methods 0.000 claims description 3
- ZXDDPOHVAMWLBH-UHFFFAOYSA-N 2,4-Dihydroxybenzophenone Chemical compound OC1=CC(O)=CC=C1C(=O)C1=CC=CC=C1 ZXDDPOHVAMWLBH-UHFFFAOYSA-N 0.000 claims description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- 150000008301 phosphite esters Chemical class 0.000 claims 1
- 239000004014 plasticizer Substances 0.000 abstract description 8
- 239000002904 solvent Substances 0.000 abstract description 7
- 230000000052 comparative effect Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 239000012855 volatile organic compound Substances 0.000 description 4
- 238000001035 drying Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- ADJMNWKZSCQHPS-UHFFFAOYSA-L zinc;6-methylheptanoate Chemical compound [Zn+2].CC(C)CCCCC([O-])=O.CC(C)CCCCC([O-])=O ADJMNWKZSCQHPS-UHFFFAOYSA-L 0.000 description 3
- 239000010426 asphalt Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 101100387915 Caenorhabditis elegans dop-4 gene Proteins 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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
- C09D175/04—Polyurethanes
- C09D175/08—Polyurethanes from polyethers
-
- 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
- C08G18/12—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step using two or more compounds having active hydrogen in the first polymerisation step
-
- 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
- C08G18/4812—Mixtures of polyetherdiols with polyetherpolyols having at least three hydroxy 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
- C08G18/70—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
-
- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
-
- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Medicinal Chemistry (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Polymers & Plastics (AREA)
- Inorganic Chemistry (AREA)
- Polyurethanes Or Polyureas (AREA)
- Paints Or Removers (AREA)
Abstract
The invention relates to a polyurethane waterproof coating and a preparation method thereof, wherein the polyurethane waterproof coating consists of a component A and a component B, wherein the component A consists of the following raw materials in parts by weight: 300 portions of polyether N-240200-; the component B comprises the following raw materials in parts by weight: 400 parts of polyether N-330300-; the weight ratio of the component A to the component B is 1: 1-3. The polyurethane waterproof coating disclosed by the invention is excellent in performance, free of solvent and plasticizer, friendly to environment and human bodies, represents the development trend of ecological environment-friendly waterproof materials, and is suitable for popularization and application.
Description
Technical Field
The invention belongs to the technical field of coatings, and particularly relates to a polyurethane waterproof coating and a preparation method thereof.
Background
The polyurethane waterproof material is developed in the 60 th of the 20 th century, and is developed from the initial tar polyurethane waterproof coating to the asphalt polyurethane waterproof coating and the current polyurethane color waterproof coating in China.
At present, the two-component polyurethane waterproof coating for domestic buildings mainly comprises asphalt and solvent type waterproofing, and contains a solvent and a plasticizer, wherein the solvent is added, so that a certain amount of VOC (volatile organic compounds) is generated in the curing process of the product and is released into the atmosphere to cause environmental pollution and is not good for human health, the cost can be reduced by adding the plasticizer into the coating, the tensile strength, toughness, extensibility and other properties of the coating are improved to a certain extent, but the coating has higher process requirements and is easy to oxidize and separate out, and meanwhile, the environmental protection problem caused by the coating is not ignored.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a polyurethane waterproof coating and a preparation method thereof. The polyurethane waterproof coating has excellent performances, does not contain solvent and plasticizer, and is environment-friendly and human-friendly.
The technical scheme of the invention is as follows:
a polyurethane waterproof coating consists of a component A and a component B,
the component A comprises the following raw materials in parts by weight: 300 portions of polyether N-240200-;
the component B comprises the following raw materials in parts by weight: 400 parts of polyether N-330300-;
the weight ratio of the component A to the component B is 1: 1-3.
Preferably, the component A consists of the following raw materials in parts by weight: polyether N-240250, polyether N-3050450 and diphenylmethane diisocyanate 350; the component B comprises the following raw materials in parts by weight: polyether N-330350 parts, coarse whiting 550 parts, antioxidant 2 parts, ultraviolet absorbent 2 parts, toner 15 parts, p-chloroaniline methane 50 parts, and catalyst 3 parts.
Preferably, the antioxidant is a mixture of phosphite antioxidants and hindered phenol antioxidants.
Preferably, the ultraviolet absorbent is any one of 2, 4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-n-octoxybenzophenone and resorcinol monobenzoate.
Preferably, the catalyst is organic bismuth and/or organic zinc.
A method for preparing the polyurethane waterproof coating, which comprises the following steps:
(1) preparing a component A: adding polyether N-240 and polyether N-3050 into a reaction kettle, heating to 110 ℃, stirring while vacuumizing, then cooling to 60 ℃, adding diphenylmethane diisocyanate to fully react to obtain a component A;
(2) preparing a component B: adding polyether N-330, heavy calcium carbonate, an antioxidant, an ultraviolet absorbent, toner, p-di-o-chloroaniline methane and a catalyst into a reaction kettle, heating to 100-;
(3) preparing a polyurethane waterproof coating: and (3) uniformly mixing and stirring the component A prepared in the step (1) and the component B prepared in the step (2) to obtain the polyurethane waterproof coating.
Preferably, in the step (1), the stirring speed is 1000-; the reaction temperature is 70-75 ℃, and the reaction time is 3-5 h.
Preferably, in step (1), the NCOwt% of the A component is 7.5-8.5%, and the A component has a viscosity of 3000-7000cps at 25 ℃.
Preferably, in the step (2), the stirring speed is 2500-.
Preferably, in step (2), the viscosity of the B component at 25 ℃ is 15000-30000 cps.
The invention has the beneficial effects that:
the polyurethane waterproof coating is prepared by fully reacting a prepolymer prepared by taking polyether N-240, polyether N-3050 and diphenylmethane diisocyanate as raw materials with polyether N-330, coarse whiting, an antioxidant, an ultraviolet absorbent, toner, p-chloroaniline methane and a catalyst, and is prepared by controlling the excess percentage of the diphenylmethane diisocyanate relative to the polyether (polyether N-240, polyether N-3050 and polyether N-330) and the proportion of difunctional polyether (polyether N-240) to trifunctional polyether (polyether N-3050 and polyether N-330) so that the finally prepared polyurethane waterproof coating has the advantages of short surface drying time, short actual drying time, high solid content, low curing shrinkage, tensile strength and low cost under the condition of not containing a solvent and a plasticizer at the same time, The elongation at break and the tearing strength are both high, the shock resistance is high, and the weather aging resistance is good; the invention has no VOC emission, no free TDI, is environment-friendly and human-friendly, represents the development trend of ecological environment-friendly waterproof materials, and is suitable for popularization and application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention. In the following examples, 1 part by weight represents 1 g.
Example 1
This example provides a polyurethane waterproof coating, which is composed of a component A and a component B,
the component A comprises the following raw materials in parts by weight: polyether N-240250, polyether N-3050450 and diphenylmethane diisocyanate 350;
the component B comprises the following raw materials in parts by weight: polyether N-330350 parts, heavy calcium carbonate 550 parts, antioxidant (B225)2 parts, ultraviolet absorbent (2-hydroxy-4-N-octoxybenzophenone) 2 parts, toner 15 parts, p-chloroaniline methane 50 parts, and organic zinc catalyst (zinc isooctanoate) 3 parts.
The weight ratio of the component A to the component B is 1: 2.
Further, a method for preparing the polyurethane waterproof coating is provided, which comprises the following steps:
(1) preparing a component A: adding polyether N-240 and polyether N-3050 into a reaction kettle, heating to 100 ℃, stirring at the speed of 1000r/min for 1.5h, simultaneously extracting vacuum until the vacuum degree is 0.085Mpa, then cooling to 60 ℃, adding diphenylmethane diisocyanate to fully react at 70-75 ℃ for 3h to obtain a component A with the NCOwt% of 7.5% and the viscosity of 5000cps/25 ℃;
(2) preparing a component B: adding polyether N-330, heavy calcium carbonate, an antioxidant (B225), an ultraviolet absorbent (2-hydroxy-4-N-octoxybenzophenone), a toner, p-chloroaniline methane and an organic zinc catalyst (zinc isooctanoate) into a reaction kettle, heating to 100 ℃, stirring at the speed of 2500r/min for 1.5h, simultaneously extracting vacuum to the vacuum degree of 0.085Mpa, and then cooling to obtain a component B with the viscosity of 20000cps/25 ℃;
(3) preparing a polyurethane waterproof coating: and (3) uniformly mixing and stirring the component A prepared in the step (1) and the component B prepared in the step (2) to obtain the polyurethane waterproof coating.
Example 2
This example provides a polyurethane waterproof coating, which is composed of a component A and a component B,
the component A comprises the following raw materials in parts by weight: polyether N-240200 parts, polyether N-3050400 parts and diphenylmethane diisocyanate 300 parts;
the component B comprises the following raw materials in parts by weight: polyether N-330300 parts, coarse whiting 500 parts, antioxidant (B225)1 part, ultraviolet absorbent (2-hydroxy-4-methoxybenzophenone) 1 part, toner 10 parts, p-chloroaniline methane 40 parts, and organic bismuth catalyst (DY-20)1 part;
the weight ratio of the component A to the component B is 1: 1.
Further, a method for preparing the polyurethane waterproof coating is provided, which comprises the following steps:
(1) preparing a component A: adding polyether N-240 and polyether N-3050 into a reaction kettle, heating to 100 ℃, stirring at the speed of 1000r/min for 1h, simultaneously extracting vacuum until the vacuum degree is 0.085Mpa, then cooling to 60 ℃, adding diphenylmethane diisocyanate to fully react at 70-75 ℃ for 3h to obtain a component A with the NCOwt% of 7.5% and the viscosity of 3000cps/25 ℃;
(2) preparing a component B: adding polyether N-330, coarse whiting, an antioxidant (B225), an ultraviolet absorbent (2-hydroxy-4-methoxybenzophenone), a toner, p-chloroaniline methane and an organic bismuth catalyst (DY-20) into a reaction kettle, heating to 100 ℃, stirring for 1h at the speed of 2500r/min, simultaneously vacuumizing to the vacuum degree of 0.085Mpa, and then cooling to obtain a component B with the viscosity of 15000cps/25 ℃;
(3) preparing a polyurethane waterproof coating: and (3) uniformly mixing and stirring the component A prepared in the step (1) and the component B prepared in the step (2) to obtain the polyurethane waterproof coating.
Example 3
This example provides a polyurethane waterproof coating, which is composed of a component A and a component B,
the component A comprises the following raw materials in parts by weight: polyether N-240300, polyether N-3050500 and diphenylmethane diisocyanate 400;
the component B comprises the following raw materials in parts by weight: polyether N-330400 parts, heavy calcium carbonate 600 parts, antioxidant (B215)3 parts, ultraviolet absorbent (resorcinol monobenzoate) 3 parts, toner 20 parts, p-chloroaniline methane 60 parts and organic zinc catalyst (KRZN1)5 parts;
the weight ratio of the component A to the component B is 1: 3.
Further, a method for preparing the polyurethane waterproof coating is provided, which comprises the following steps:
(1) preparing a component A: adding polyether N-240 and polyether N-3050 into a reaction kettle, heating to 110 ℃, stirring at the speed of 2000r/min for 2h, simultaneously extracting vacuum until the vacuum degree is 0.1Mpa, then cooling to 60 ℃, adding diphenylmethane diisocyanate to fully react at 70-75 ℃ for 5h to obtain a component A with the NCOwt% of 8.5% and the viscosity of 7000cps/25 ℃;
(2) preparing a component B: adding polyether N-330, heavy calcium carbonate, an antioxidant (B215), an ultraviolet absorbent (resorcinol monobenzoate), toner, p-chloroaniline methane and an organic zinc catalyst (KRZN1) into a reaction kettle, heating to 110 ℃, stirring at the speed of 3000r/min for 2h, simultaneously vacuumizing to the vacuum degree of 0.1Mpa, and then cooling to obtain a component B with the viscosity of 30000cps/25 ℃;
(3) preparing a polyurethane waterproof coating: and (3) uniformly mixing and stirring the component A prepared in the step (1) and the component B prepared in the step (2) to obtain the polyurethane waterproof coating.
Comparative example 1
The difference from example 1 is only that the composition of the raw material of the component A is different, and the component A of the comparative example consists of the following raw materials in parts by weight: polyether N-240450, polyether N-3050250 and diphenylmethane diisocyanate 350.
Comparative example 2
The difference from example 1 is only that the composition of the raw material of the component A is different, and the component A of the comparative example consists of the following raw materials in parts by weight: polyether N-240250 parts, polyether N-3050450 parts and diphenylmethane diisocyanate 600 parts.
Comparative example 3
The difference from example 1 is only that the composition of the raw material of the component B is different, and the component B of the comparative example consists of the following raw materials in parts by weight: polyether N-330350 parts, heavy calcium carbonate 550 parts, plasticizer DOP 4 parts, toner 15 parts, p-chloroaniline methane 50 parts, and organic zinc catalyst (zinc isooctanoate) 3 parts.
In order to further confirm the effect of the invention, the inventor of the application refers to the GB/T19250-2013 standard to perform various performance tests of the embodiment 1 and the comparative examples 1-3 of the invention, and the results are shown in the table 1:
table 1 results of performance testing
The results show that the ratio between polyether N-240 and polyether N-3050 and the ratio between polyether (polyether N-240 and polyether N-3050) and diphenylmethane diisocyanate, including the dry-out time, the tensile strength, the elongation at break, the tear strength, and the heat shrinkage, are changed, indicating that the ratio of the materials has a significant effect on the properties of the final coating, and further analysis shows that the ratio between the difunctional polyether (polyether N-240) and the trifunctional polyether (polyether N-3050) and the excess percentage of diphenylmethane diisocyanate to the polyether (polyether N-240, polyether N-3050) in the absence of solvent and plasticizer have a significant effect on the physical properties of the coating: the excessive percentage of the diphenylmethane diisocyanate is large, the tensile strength and the tearing strength of the coating are high, the heating shrinkage rate is small, the excessive percentage of the diphenylmethane diisocyanate is small, the tensile strength and the tearing strength of the coating are low, and the heating shrinkage rate is large; the ratio of difunctional polyether to trifunctional polyether is reduced, the surface drying time is shortened, the tensile strength is relatively increased, and the foaming is relatively easy. In addition, the invention obtains various performance indexes equivalent to those of the plasticizer, but the invention has no VOC emission, is more beneficial to the environment and human health, and therefore, is obviously better in the aspect of environmental protection.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (6)
1. The polyurethane waterproof coating is characterized by comprising a component A and a component B:
the component A comprises the following raw materials in parts by weight: 300 portions of polyether N-240200-;
the component B comprises the following raw materials in parts by weight: 400 parts of polyether N-330300-; the weight ratio of the component A to the component B is 1: 1-3;
the antioxidant is a mixture of phosphite ester antioxidant and hindered phenol antioxidant;
the ultraviolet absorbent is any one of 2, 4-dihydroxy benzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-n-octoxybenzophenone and resorcinol monobenzoate;
the catalyst is organic bismuth and/or organic zinc;
the preparation method of the polyurethane waterproof coating comprises the following steps:
(1) preparing a component A: adding polyether N-240 and polyether N-3050 into a reaction kettle, heating to 110 ℃, stirring while vacuumizing, then cooling to 60 ℃, adding diphenylmethane diisocyanate to fully react to obtain a component A;
(2) preparing a component B: adding polyether N-330, heavy calcium carbonate, an antioxidant, an ultraviolet absorbent, toner, p-di-o-chloroaniline methane and a catalyst into a reaction kettle, heating to 100-;
(3) preparing a polyurethane waterproof coating: and (3) uniformly mixing and stirring the component A prepared in the step (1) and the component B prepared in the step (2) to obtain the polyurethane waterproof coating.
2. The polyurethane waterproof coating of claim 1, wherein the component A is composed of the following raw materials in parts by weight: polyether N-240250, polyether N-3050450 and diphenylmethane diisocyanate 350; the component B comprises the following raw materials in parts by weight: polyether N-330350 parts, coarse whiting 550 parts, antioxidant 2 parts, ultraviolet absorbent 2 parts, toner 15 parts, p-chloroaniline methane 50 parts, and catalyst 3 parts.
3. The polyurethane waterproof coating material as claimed in claim 1, wherein in the step (1), the stirring speed is 1000-; the reaction temperature is 70-75 ℃, and the reaction time is 3-5 h.
4. The polyurethane waterproofing coating according to claim 1, wherein in step (1), NCOwt% in the A component is 7.5 to 8.5%, and the viscosity of the A component at 25 ℃ is 3000-7000 cps.
5. The polyurethane waterproof coating material as claimed in claim 1, wherein in the step (2), the stirring speed is 2500-.
6. The polyurethane waterproofing coating according to claim 1, wherein in the step (2), the viscosity of the B component at 25 ℃ is 15000-30000 cps.
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