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CN112341925B - Anti-sagging solvent-free type single-component polyurethane waterproof paint and preparation method thereof - Google Patents

Anti-sagging solvent-free type single-component polyurethane waterproof paint and preparation method thereof Download PDF

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Publication number
CN112341925B
CN112341925B CN202011381662.XA CN202011381662A CN112341925B CN 112341925 B CN112341925 B CN 112341925B CN 202011381662 A CN202011381662 A CN 202011381662A CN 112341925 B CN112341925 B CN 112341925B
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solvent
sagging
component polyurethane
polyurethane waterproof
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CN112341925A (en
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孙智宁
程波
孙平刚
郑志杰
宋正红
李富伟
刘金宝
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Yuandahongyu Tangshan Waterproof Material Co ltd
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Yuandahongyu Tangshan Waterproof Material Co ltd
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    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING 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
    • C09D175/00Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/04Polyurethanes
    • C09D175/08Polyurethanes from polyethers
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING 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
    • C09D7/00Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40Additives
    • C09D7/60Additives non-macromolecular
    • C09D7/61Additives non-macromolecular inorganic
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING 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
    • C09D7/00Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40Additives
    • C09D7/60Additives non-macromolecular
    • C09D7/61Additives non-macromolecular inorganic
    • C09D7/62Additives non-macromolecular inorganic modified by treatment with other compounds
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING 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
    • C09D7/00Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40Additives
    • C09D7/60Additives non-macromolecular
    • C09D7/63Additives non-macromolecular organic
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING 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
    • C09D7/00Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40Additives
    • C09D7/65Additives macromolecular
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00Use of inorganic substances as compounding ingredients
    • C08K3/18Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/24Acids; Salts thereof
    • C08K3/26Carbonates; Bicarbonates
    • C08K2003/265Calcium, strontium or barium carbonate

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
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  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Paints Or Removers (AREA)

Abstract

The invention relates to the technical field of building waterproof coatings, and provides an anti-sagging solvent-free type single-component polyurethane waterproof coating which comprises the following raw materials, by weight, 16-23 parts of polyether polyol, 6-10 parts of diphenylmethane diisocyanate, 14-19 parts of a plasticizer, 40-45 parts of a pigment and filler, 0.1-0.4 part of an antifoaming agent, 0.51-1.02 part of a compound catalyst, and 1.2-1.6 parts of a rheological additive. Through the technical scheme, the problems of poor drying film forming speed, poor sagging resistance and poor mechanical property in the prior art are solved.

Description

Anti-sagging solvent-free type single-component polyurethane waterproof paint and preparation method thereof
Technical Field
The invention relates to the technical field of building waterproof coatings, in particular to an anti-sagging solvent-free type single-component polyurethane waterproof coating which is particularly suitable for construction in closed spaces such as basements, fire-fighting water pools and the like and under special environments such as rainy seasons, side wall facades of basements, slope surfaces and the like.
Background
The polyurethane waterproof paint is prepared with isocyanate, polyether, catalyst, assistant, pigment and other material and through addition polymerization. At present, the conventional polyurethane coating has high viscosity, a manufacturer increases the amount of a filler in order to reduce cost, the coating has high viscosity, and the coating is difficult to construct and apply without adding a solvent, but the solvent is volatilized during construction due to the addition of the solvent, so that the coating has high taste and air pollution; meanwhile, the existing polyurethane waterproof coating has the defect of low strength in drying and film forming, and is not beneficial to slow drying and delay of construction period under working conditions such as winter in low-temperature and low-humidity environment; in addition, for the side face of a basement, a high-speed rail, a subway, a tunnel, civil air defense and the like, waterproof construction needs to be carried out on a vertical face or a slope face, the existing polyurethane waterproof coating can flow when being coated on the vertical face or the slope face, so that the thickness of a coating film is uneven, for example, a coating film with the thickness of 1.5mm needs to be coated, the existing polyurethane coating can reach the specified thickness by being coated for 4-5 times, the construction efficiency is greatly reduced, and the construction cost is increased.
Disclosure of Invention
The invention provides an anti-sagging solvent-free type single-component polyurethane waterproof coating and a preparation method thereof, which solve the problems of poor drying film-forming speed, anti-sagging property and mechanical property in the related technology.
The technical scheme of the invention is as follows:
the anti-sagging solvent-free single-component polyurethane waterproof coating comprises, by weight, 16-23 parts of polyether polyol, 6-10 parts of diphenylmethane diisocyanate, 15-20 parts of a plasticizer, 40-45 parts of a pigment filler, 0.1-0.4 part of a defoaming agent, 0.51-1.02 part of a compound catalyst and 1.2-1.6 parts of a rheological additive.
As a further technical scheme, the polyether polyol is two or more of polyether polyol with the relative molecular weight of 2000 and the hydroxyl value of 54.0-58 mgKOH/g, polyether polyol with the relative molecular weight of 5000 and the hydroxyl value of 32.0-36.5 mgKOH/g and polyether polyol with the relative molecular weight of 4000 and the hydroxyl value of 34.5-37.0 mgKOH/g.
According to a further technical scheme, the diphenylmethane diisocyanate comprises 6.5-7 parts of MDI-100 and 1-1.2 parts of MDI-50, wherein the mass ratio of 4,4' -diphenylmethane diisocyanate to 2, 4-diphenylmethane diisocyanate is 8-10: 1, MDI-100 is MDI with more than 98% of 4,4' -diphenylmethane diisocyanate, and MDI-50 is a mixture of 2, 4-diphenylmethane diisocyanate and 4,4' -diphenylmethane diisocyanate, and the ratio of the MDI-50 is 6: 4.
As a further technical scheme, the plasticizer comprises diisononyl phthalate, and also comprises one or more of chlorinated paraffin and non-reactive modifier;
wherein the chlorinated paraffin is chlorinated paraffin with the average length of carbon chain more than 13,
the non-reactive modifier is a naphthalene or biphenyl based non-reactive modifier comprising one or more of isopropylnaphthalene or isopropylbiphenyl.
As a further technical scheme, the pigment and filler comprises ground calcium carbonate, heptyl undecyl hydroxyl stearate modified kaolin, and one or more of nano calcium carbonate, carbon black and bentonite.
According to a further technical scheme, the preparation method of the heptyl undecyl hydroxyl stearate modified kaolin comprises the following steps of stirring 1400-1500 meshes of kaolin in a ball mill, adding heptyl undecyl hydroxyl stearate, wherein the weight ratio of the heptyl undecyl hydroxyl stearate to the kaolin is 1.5-2: 98-98.5, heating to 80-90 ℃, keeping the temperature for half an hour, then cooling to 40 ℃, and discharging to obtain the heptyl undecyl hydroxystearate modified kaolin.
As a further technical scheme, the compound catalyst is a mixture of two or more of dibutyltin dilaurate, zinc 2-ethylhexanoate and a non-reactive oxazolidine latent curing agent.
As a further technical scheme, the rheological additive is micro-powder polyamide wax, dimethylene cyclohexane bis (hydroxy stearamide) and liquid modified urea,
or a micronized polyamide wax and dimethylenecyclohexane bis-hydroxystearamide.
The invention also provides a preparation method of the anti-sagging solvent-free single-component polyurethane waterproof coating, which comprises the following steps:
s1, adding polyether polyol and a plasticizer into the reaction kettle, and stirring at a high speed and heating to 80 ℃;
s2, adding the nano calcium carbonate or bentonite in the pigment and filler, dispersing at high speed for 30min, and continuing to heat;
s3, adding other pigments and fillers, heating to 120 ℃, and dehydrating under the vacuum degree of-0.095 MPa until the water content is lower than 0.03%;
s4, cooling to 65 ℃, adding diphenylmethane diisocyanate, heating to 80 ℃ and reacting for 3 h;
s5, cooling to 65 ℃, adding a defoaming agent and compounding a catalyst;
s6, cooling to 60 ℃, adding rheological additive, diluting with dimethyl sulfoxide (DMSO), dispersing at high speed for 30min, standing, vacuum degassing for 30min, discharging and packaging.
The invention also provides application of the anti-sagging solvent-free single-component polyurethane waterproof coating in the field of building waterproofing.
The invention has the beneficial effects that:
1. the anti-sagging solvent-free single-component polyurethane waterproof coating provided by the invention can realize moderate viscosity without adding a solvent, and simultaneously has excellent drying film forming speed and anti-sagging property, and simultaneously the formed film has excellent physical and mechanical properties, and the surface is smooth and has no air holes.
2. According to the invention, heptyl undecyl hydroxyl stearate is used for modifying kaolin, a gel structure is formed through a hydrogen bond, the affinity of the kaolin with liquid materials is increased, and the dispersibility of the kaolin is improved, so that the mechanical property of the kaolin is better endowed to a polyurethane coating, and meanwhile, the flexibility of the coating is increased to a certain extent due to the long chain of the heptyl undecyl hydroxyl stearate.
3. According to the invention, dimethylene cyclohexane bis-hydroxystearamide and polyamide wax powder are compounded to exert a synergistic effect, and a strong network structure is formed in a paint system, so that the coating has excellent sagging resistance and sedimentation resistance, and the viscosity and the mechanical property of the coating are increased.
4. According to the invention, zinc 2-ethylhexanoate, dibutyltin dilaurate and a non-reactive oxazolidine latent curing agent are compounded with a catalyst, three components play a synergistic effect and are mutually enhanced, so that the surface drying time and the actual drying time are prolonged, and the bonding strength is reduced. The compound catalyst can accelerate the drying and film-forming speed and increase the bonding strength of the coating.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any inventive step, are intended to be within the scope of the present invention.
Example 1
The anti-sagging solvent-free single-component polyurethane waterproof coating comprises the following formula:
components Parts by weight
Polyether DL-2000 10
Polyether 330N 6
Diisononyl phthalate 9
Plasticizer Novares LA300 5
Dimethylene cyclohexane bis (hydroxystearamide) 0.2
Nano calcium carbonate M400 1
Carbon black 2
Ground calcium carbonate 36
Modified kaolin 1
MDI-100 6.5
MDI-50 1.2
Dibutyl tin dilaurate 0.01
Oxazolidine latent curing agent HY-901 0.5
Defoaming agent A-2270 0.1
Polyamide wax powder SLX 1
The preparation method comprises the following steps:
s1, stirring 1400 mesh kaolin in a ball mill, adding heptyl undecyl hydroxyl stearate, wherein the weight ratio of the heptyl undecyl hydroxyl stearate to the kaolin is 2: 98, heating to 90 ℃, keeping the temperature for half an hour, then cooling to 40 ℃, and discharging to obtain the heptyl undecyl hydroxystearate modified kaolin.
S2, adding polyether polyol and a plasticizer into the reaction kettle, and stirring at a high speed and heating to 80 ℃;
s3, adding nano calcium carbonate M400, dispersing at high speed for 30min, and continuing to heat;
s4, adding other pigments and fillers, heating to 120 ℃, and dehydrating under the vacuum degree of-0.095 MPa until the water content is lower than 0.03%;
s5, cooling to 65 ℃, adding diphenylmethane diisocyanate, heating to 80 ℃ and reacting for 3 h;
s6, cooling to 65 ℃, adding a defoaming agent and compounding a catalyst;
s7, cooling to 60 ℃, adding rheological additive, diluting with dimethyl sulfoxide (DMSO), dispersing at high speed for 30min, standing, vacuum degassing for 30min, discharging and packaging.
Example 2
The anti-sagging solvent-free single-component polyurethane waterproof coating comprises the following formula:
components Parts by weight
Polyether DL-2000 14
Polyether 330N 6
Diisononyl phthalate 10
Isopropyl naphthalene 6
Dimethylene cyclohexane bis (hydroxystearamide) 0.2
Bentonite clay 1
Carbon black 2
Ground calcium carbonate 38
Modified kaolin 1
MDI-100 7
MDI-50 1.2
2-Ethyl hexanoic acid zinc salt 0.01
Dibutyl tin dilaurate 0.01
Oxazolidine latent curing agent HY-901 0.6
Defoaming agent A-2270 0.3
Liquid modified urea LA-150 0.5
Polyamide wax powder SLX 1
The preparation method comprises the following steps:
s1, stirring 1500-mesh kaolin in a ball mill, adding heptyl undecyl hydroxyl stearate, wherein the weight ratio of the heptyl undecyl hydroxyl stearate to the kaolin is 1.5: 98.5, heating to 80 ℃, keeping the temperature for half an hour, then cooling to 40 ℃, and discharging to obtain the heptyl undecyl hydroxystearate modified kaolin.
S2, adding polyether polyol and a plasticizer into the reaction kettle, and stirring at a high speed and heating to 80 ℃;
s3, adding bentonite, dispersing at high speed for 30min, and continuing to heat;
s4, adding other pigments and fillers, heating to 120 ℃, and dehydrating under the vacuum degree of-0.095 MPa until the water content is lower than 0.03%;
s5, cooling to 65 ℃, adding diphenylmethane diisocyanate, heating to 80 ℃ and reacting for 3 h;
s6, cooling to 65 ℃, adding a defoaming agent and compounding a catalyst;
s7, cooling to 60 ℃, adding rheological additive, diluting with dimethyl sulfoxide (DMSO), dispersing at high speed for 30min, standing, vacuum degassing for 30min, discharging and packaging.
Example 3
The anti-sagging solvent-free single-component polyurethane waterproof coating comprises the following formula:
components Parts by weight
Polyether DL-2000 16
Polyether 330N 6
Diisononyl phthalate 12
Isopropyl naphthalene 7
Dimethylene cyclohexane bis (hydroxystearamide) 0.4
Bentonite clay 1.5
Carbon black 2
Ground calcium carbonate 40
Modified kaolin 1.5
MDI-100 7
MDI-50 1
2-Ethyl hexanoic acid zinc salt 0.02
Oxazolidine latent curing agent HY-901 1
Defoaming agent A-2270 0.4
Polyamide wax powder SLX 1.2
The preparation method is the same as that of example 2.
Comparative example 1
The formula is as follows:
Figure BDA0002808639300000051
Figure BDA0002808639300000061
the preparation method is different from the example 2 in that one step of modified kaolin is omitted, and the other steps are the same.
Comparative example 2
The formula is as follows:
Figure BDA0002808639300000062
Figure BDA0002808639300000071
the preparation method is the same as that of example 2.
Comparative example 3
The formula is as follows:
components Parts by weight
Polyether DL-2000 14
Polyether 330N 6
Diisononyl phthalate 10
Isopropyl naphthalene 6
Dimethylene cyclohexane bis (hydroxystearamide) 0.2
Bentonite clay 1
Carbon black 2
Ground calcium carbonate 38
Modified kaolin 1
MDI-100 7
MDI-50 1.2
Defoaming agent A-2270 0.3
Liquid modified urea LA-150 0.5
Polyamide wax powder SLX 1
The preparation method is different from the example 2 in that the addition of the compound catalyst is omitted, and the rest is the same.
The performance test results are shown in the following table, wherein the tests of solid content, surface drying time, actual drying time, tensile strength, elongation at break, tearing strength and bonding strength are carried out according to GB/T19250-2013 polyurethane waterproof coating, and the test of a sag resistance tester with the thickness of 450-1000 um requires that the coating is thick for 1mm and does not sag once.
TABLE 1 tables of Performance test data of examples 1 to 3 and comparative examples 1 to 3
Figure BDA0002808639300000072
Figure BDA0002808639300000081
As can be seen from the data in the table, the anti-sagging solvent-free type single-component polyurethane waterproof coating prepared in the embodiments 1 to 3 meets the requirements of a pavement anti-skid coating, has excellent performance, can have excellent drying film forming speed and anti-sagging property under the condition of not adding a solvent, and has excellent physical and mechanical properties, such as strength and the like, of a formed film. The raw material proportion and the preparation method adopted in the embodiment 2 are the technical scheme with relatively better comprehensive data in all aspects of the invention, and the prepared coating has the best performance.
Compared with the example 2, the kaolin is not modified by the heptyl undecyl hydroxy stearate, the mechanical properties of the comparative example 2 are reduced to different degrees, the tensile strength is reduced by 0.1MPa, the elongation at break is reduced by 15%, the tear strength is reduced by 1N/mm, and the bonding strength is reduced by 0.3 MPa. The heptyl undecyl hydroxyl stearate is used for modifying the kaolin, a gel structure is formed through hydrogen bonds, the affinity of the kaolin and a liquid material is increased, and the dispersibility of the kaolin is improved, so that the mechanical property of the kaolin is better endowed to the polyurethane coating, and meanwhile, the long chain of the heptyl undecyl hydroxyl stearate also increases the flexibility of the coating to a certain degree.
Comparative example 2 compared with example 2, the sag resistance was deteriorated, the adhesive strength was reduced by 0.4MPa, and the tear strength was reduced by 1.7N/mm without adding dimethylene cyclohexane bishydroxystearamide and the liquid modified urea. The dimethylene cyclohexane bis-hydroxystearamide and the polyamide wax powder are compounded to play a synergistic role, and a strong network structure is formed in a paint system, so that the coating has excellent sagging resistance and sedimentation resistance, and the viscosity of the coating is increased.
Compared with the example 2, the compound catalyst 2-ethylhexoic acid zinc, dibutyltin dilaurate and oxazolidine latent curing agent is not added in the comparative example 3, so that the surface drying time and the actual drying time are prolonged, and the bonding strength is reduced. The compound catalyst can accelerate the drying and film-forming speed and increase the bonding strength of the coating.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (6)

1. The anti-sagging solvent-free single-component polyurethane waterproof coating is characterized by comprising the following raw materials, by weight, 16-23 parts of polyether polyol, 6-10 parts of diphenylmethane diisocyanate, 14-19 parts of a plasticizer, 40-45 parts of a pigment filler, 0.1-0.4 part of a defoaming agent, 0.51-1.02 part of a compound catalyst and 1.2-1.6 parts of a rheological additive;
the pigment and filler comprises heavy calcium carbonate, heptyl undecyl hydroxyl stearate modified kaolin, and one or more of nano calcium carbonate, carbon black and bentonite;
the rheological additive is micro-powder polyamide wax, dimethylene cyclohexane bis-hydroxystearamide and liquid modified urea,
or micropowder polyamide wax and dimethylene cyclohexane bis (hydroxystearamide);
the preparation method of the heptyl undecyl hydroxyl stearate modified kaolin comprises the steps of stirring 1400-1500 meshes of kaolin in a ball mill, adding heptyl undecyl hydroxyl stearate, wherein the weight ratio of the heptyl undecyl hydroxyl stearate to the kaolin is 1.5-2: 98-98.5, heating to 80-90 ℃, keeping the temperature for half an hour, then cooling to 40 ℃, and discharging to obtain heptyl undecyl hydroxyl stearate modified kaolin;
the compound catalyst is two or more than two of dibutyltin dilaurate, zinc 2-ethyl hexanoate and a non-reactive oxazolidine latent curing agent.
2. The anti-sagging solvent-free type one-component polyurethane waterproof coating material as claimed in claim 1, wherein the polyether polyol is two or more of a polyether polyol having a relative molecular mass of 2000 and a hydroxyl value of 54.0 to 58mgKOH/g, a polyether polyol having a relative molecular mass of 5000 and a hydroxyl value of 32.0 to 36.5mgKOH/g, and a polyether polyol having a relative molecular mass of 4000 and a hydroxyl value of 34.5 to 37.0 mgKOH/g.
3. The anti-sagging solvent-free type one-component polyurethane waterproof coating as claimed in claim 1, wherein the diphenylmethane diisocyanate comprises 6.5-7 parts of MDI-100 and 1-1.2 parts of MDI-50, and the mass ratio of 4,4' -diphenylmethane diisocyanate to 2, 4-diphenylmethane diisocyanate is 8-10: 1.
4. The anti-sagging solvent-free one-component polyurethane waterproof coating material of claim 1, wherein the plasticizer comprises diisononyl phthalate, and further comprises one or more of chlorinated paraffin and non-reactive modifier;
wherein the chlorinated paraffin is chlorinated paraffin with the average length of carbon chain more than 13,
wherein the non-reactive modifier is a non-reactive modifier based on naphthalene or biphenyl, and comprises one or more of isopropyl naphthalene or isopropyl biphenyl.
5. A method for preparing the sag-resistant solvent-free one-component polyurethane waterproof coating material according to claim 1, comprising the steps of:
s1, adding polyether polyol and a plasticizer into the reaction kettle, and stirring at a high speed and heating to 80 ℃;
s2, adding the nano calcium carbonate or bentonite in the pigment and filler, dispersing at high speed for 30min, and continuing to heat;
s3, adding other pigments and fillers, heating to 120 ℃, and dehydrating under the vacuum degree of-0.095 MPa until the water content is lower than 0.03%;
s4, cooling to 65 ℃, adding diphenylmethane diisocyanate, heating to 80 ℃ and reacting for 3 h;
s5, cooling to 65 ℃, adding a defoaming agent and compounding a catalyst;
s6, cooling to 60 ℃, adding rheological additive, diluting with DMSO, dispersing at high speed for 30min, standing, vacuum degassing for 30min, discharging and packaging.
6. The use of the anti-sagging solvent-free one-component polyurethane waterproof coating according to any one of claims 1 to 4 in the field of building waterproofing.
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CN113372804B (en) * 2021-05-27 2023-01-20 锦绣防水科技有限公司 Single-component polyurethane waterproof paint capable of forming film once and preparation method thereof
CN113652161A (en) * 2021-08-18 2021-11-16 北新禹王防水科技集团有限公司 Anti-sagging polyurethane waterproof coating
CN118271956A (en) * 2024-05-06 2024-07-02 丽天防水科技有限公司 Quick-drying type single-component polyurethane waterproof coating and preparation method thereof

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