CN111732833A - Waterborne polyurethane for automotive interior and automotive chassis paint - Google Patents
Waterborne polyurethane for automotive interior and automotive chassis paint Download PDFInfo
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- CN111732833A CN111732833A CN202010636862.9A CN202010636862A CN111732833A CN 111732833 A CN111732833 A CN 111732833A CN 202010636862 A CN202010636862 A CN 202010636862A CN 111732833 A CN111732833 A CN 111732833A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
- C08L75/04—Polyurethanes
- C08L75/06—Polyurethanes from polyesters
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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
- C08G18/0838—Manufacture of polymers in the presence of non-reactive compounds
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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
- C08G18/08—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
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
- C08L75/04—Polyurethanes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
- C08L75/04—Polyurethanes
- C08L75/08—Polyurethanes from polyethers
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- 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
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- 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
- C09D175/06—Polyurethanes from polyesters
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- 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
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/18—Fireproof paints including high temperature resistant paints
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
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Abstract
The invention relates to waterborne polyurethane for automotive interior and automotive chassis paint, which comprises the following components: 10-30 parts of fat dissolving particles; 10-50 parts of polyisocyanate; 20-40 parts of a hydrogen-containing compound; 0.5-2 parts of a flame retardant; 1-5 parts of a chain extender; 1-5 parts of zeolite powder; 0.5-0.8 part of epoxy resin curing agent; 0.2-0.6 part of organic drier; 10-50 parts of a water-based curing agent; 0.5-1 part of foam hole regulator, and the waterborne polyurethane prepared by the method has moderate viscosity, light color, high brightness and good leveling property, is nontoxic after being cured with epoxy resin, has better insulativity, water resistance and wear resistance, and can play a good protection role when being used for automobile interior trim or automobile chassis paint.
Description
Technical Field
The invention relates to the field of automobile interior decoration spraying or automobile chassis paint spraying, in particular to waterborne polyurethane for automobile interior decoration and automobile chassis paint.
Background
The automobile chassis armor is characterized in that the automobile chassis armor is named as an automobile chassis anti-collision antirust sound insulation (primer), namely chassis paint, and a high-tech adhesive rubber asphalt coating which has the advantages of no toxicity, high coverage rate and high adhesiveness, can be sprayed on exposed parts of a vehicle chassis, a hub, an oil tank, an automobile lower coaming, a trunk and the like, and is a novel polyurethane system using water instead of an organic solvent as a dispersion medium, namely water-dispersed polyurethane, water-system polyurethane or water-based polyurethane. The waterborne polyurethane takes water as a solvent, has the advantages of no pollution, safety, reliability, excellent mechanical property, good compatibility, easy modification and the like, and the waterborne polyurethane gradually replaces the solvent type, thus becoming an important direction for the development of the polyurethane industry. Waterborne polyurethanes have many advantages and are therefore widely used in coatings, inks, adhesives, leather finishes, artificial leather, glove lubricants, and the like. Taking leather finishing agent as an example, finishing is an important link in the leather manufacturing process. It can increase the beauty and durability of leather, improve grade, increase the variety of patterns and widen the application range. The waterborne polyurethane can be widely applied to paint spraying of automotive interior spray layers and automotive chassis paint spraying in a large amount, a firm elastic protective layer is formed after quick drying, impact of flying stones and gravel can be prevented, corrosion of moisture, acid rain and salt on metal of the automotive chassis is avoided, the chassis is prevented from rusting and rusting, driving safety of an automobile owner is protected, and the waterborne polyurethane emulsion prepared by the traditional method is poor in stability, low in viscosity and free of flame retardance, and is sprayed on the automotive interior and the chassis, so that the safety performance is low.
Disclosure of Invention
The invention overcomes the defects of the prior art and provides the waterborne polyurethane for the automotive interior and the automotive chassis paint.
In order to achieve the purpose, the invention adopts a technical scheme that: an aqueous polyurethane for automotive interior and automotive chassis paints comprising: 10-30 parts of fat dissolving particles; 10-50 parts of polyisocyanate; 20-40 parts of a hydrogen-containing compound; 0.5-2 parts of a flame retardant; 1-5 parts of a chain extender; 1-5 parts of zeolite powder; 0.5-0.8 part of epoxy resin curing agent; 0.2-0.6 part of organic drier; 10-50 parts of a water-based curing agent; 0.5-1 part of foam pore regulator.
In a preferred embodiment of the invention, the flame retardant is 4-aminobenzene or phosphorus biphenol oxide, which is introduced by a chain extension reaction.
In a preferred embodiment of the present invention, the polyisocyanate can include one or a combination of two or more of toluene diisocyanate or tolylene polyphenyl polyisocyanate or isophorone diisocyanate.
In a preferred embodiment of the present invention, the hydrogen-containing compound is a macromolecular compound including a polyester polyol, a polyether polyol or a polyol resin emulsion.
In a preferred embodiment of the present invention, the fat dissolving particles are provided with a plurality of pores.
In order to achieve the above purpose, the second technical solution adopted by the present invention is: a preparation method of waterborne polyurethane for automotive interior and automotive chassis paint comprises the following steps:
s1, adding polyisocyanate into a container, heating to 15-50 ℃, adding fat-dissolving particles, allowing the polyisocyanate to flow into pores of the fat-dissolving particles to form granular polyisocyanate, and storing for later use;
s2, adding zeolite powder, a water-based curing agent and the zeolite powder into a hydrogen-containing compound to form emulsion, adding the granular polyisocyanate in the S1 into the emulsion prepared by the S2, and stirring and reacting for 2-4 hours at the temperature of 20-80 ℃;
s3, mixing ketimine with an end-NCO polyurethane prepolymer containing an ionic group by a ketimine method, adding a proper amount of water, releasing diamine or hydrazine, and carrying out chain extension on the prepolymer to obtain an aqueous polyurethane-urea dispersion liquid;
and S4, adding the flame retardant, the epoxy resin curing agent and the cell regulator into the aqueous polyurethane-urea dispersion liquid for curing and drying, and stirring for 1-2 hours to obtain the emulsion aqueous polyurethane.
In a preferred embodiment of the present invention, in S3, a protective film can be formed on the surface of the-NCO-terminated group of the polyurethane prepolymer having a hydrophilic ionic group and being terminated with the-NCO by adding methylethylketone imine, pyrrolidone or sodium bisulfite.
In a preferred embodiment of the invention, S4 is heated, and a cross-linking agent is added during the heating process to react, so as to form the net-structure waterborne polyurethane adhesive film.
In a preferred embodiment of the present invention, after stirring for 2 hours in S2, the mixture is allowed to stand for 24 hours, and the mixed solution is cooled to room temperature.
The invention solves the defects in the background technology, and has the following beneficial effects:
(1) the waterborne polyurethane prepared by the method has moderate viscosity, light color, high brightness and good leveling property, is nontoxic after being cured with epoxy resin, has better insulativity, water resistance and wear resistance, and can play a good protection role when being used for automobile interior trim or automobile chassis paint.
(2) After the fixing agent and the flame retardant are added into the waterborne polyurethane, the waterborne polyurethane has good tensile strength and flame retardant property, wherein the maximum tensile strength can reach 6.2MPa, the elongation at break can reach 810%,
(3) the polyisocyanate can be absorbed and dissolved into the pores through the porous fat-dissolving particles, so that the polyisocyanate can be uniformly distributed, and the prepared polyisocyanate is in a particle structure, so that the hardness of the waterborne polyurethane can be improved in the preparation process, and the effective area of the particle polyisocyanate in the chain extension reaction can be increased.
(4) In the prepolymer mixing method, when water-soluble primary diamine is used as a chain extender, because the reaction rate of amino and-NCO groups is too high, a dispersion with uniform and fine particle size is difficult to obtain, ketimine is generated by the reaction of ketone and diamine, and ketone-hydrazine is generated by the reaction of ketone and hydrazine. The ketimine/ketone-linked nitrogen does not generate chain extension reaction prematurely when being mixed with the terminal-NCO polyurethane prepolymer containing the ionic group, but when meeting water, the ketimine/ketone-linked nitrogen reacts with the water to release diamine/hydrazine to carry out chain extension on the prepolymer, and the chain extension reaction can be carried out smoothly due to the restriction of the release reaction, so that the waterborne polyurethane-urea dispersion liquid with good performance is obtained.
Detailed Description
The present invention will now be described in further detail with reference to examples.
The preparation method of the waterborne polyurethane can be generally divided into an external emulsification method and an internal emulsification method. The external emulsification method is a method for forcibly dispersing polyurethane particles in water under the action of strong shearing force by adopting an external emulsifier, but the method has the defects of large using amount of the emulsifier, long reaction time, coarse emulsion particles, poor quality of finally obtained products, poor physical and mechanical properties of glue layers and the like, so the method is basically not used in the current production. The internal emulsification method can be divided into acetone method, prepolymer mixing method, melting dispersion method, ketimine/ketone-nitrogen-linking method and protective end group emulsification.
Example 1: an aqueous polyurethane for automotive interior and automotive chassis paints comprising: 10 parts of fat dissolving particles; 50 parts of polyisocyanate; 40 parts of a hydrogen-containing compound; 0.5 part of flame retardant; 1 part of a chain extender; 1 part of zeolite powder; 0.5 part of epoxy resin curing agent; 0.2 part of organic drier; 10 parts of a water-based curing agent; and 0.5 part of a foam pore regulator.
According to the embodiment of the invention, the flame retardant is 4-aminobenzene, and the flame retardant is introduced through a chain extension reaction.
According to an embodiment of the present invention, the polyisocyanate can include toluene diisocyanate.
According to an embodiment of the present invention, the hydrogen-containing compound is a macromolecular compound including a polyester polyol.
According to the embodiment of the invention, the fat dissolving particles are provided with a plurality of pores, the cross section of each pore is circular, and the size of each pore is 20 microns.
After the fixing agent and the flame retardant are added into the waterborne polyurethane, the waterborne polyurethane has good tensile strength and flame retardant property, wherein the highest tensile strength can reach 2.4MPa, and the elongation at break can reach 510%.
The fat-dissolving particles can be materials containing active groups such as sulfenyl groups and halogenated hydrocarbon groups, the polyisocyanates can be absorbed and dissolved into pores through the porous fat-dissolving particles, the polyisocyanates can be uniformly distributed, the prepared polyisocyanates are in particle structures, and the hardness of the waterborne polyurethane can be improved in the preparation process, and the effective area of the granular polyisocyanate in the chain extension reaction can be increased.
Example 2: an aqueous polyurethane for automotive interior and automotive chassis paints comprising: 20 parts of fat dissolving particles; 40 parts of polyisocyanate; 30 parts of a hydrogen-containing compound; 1 part of a flame retardant; 3 parts of a chain extender; 2 parts of zeolite powder; 0.7 part of epoxy resin curing agent; 0.5 part of organic drier; 20 parts of a water-based curing agent; and 0.8 part of a foam pore regulator.
According to the embodiment of the invention, the flame retardant is phosphorus oxybenzene, and the flame retardant is introduced through chain extension reaction.
According to embodiments of the present invention, the polyisocyanate can include a multitimetic polyphenyl polyisocyanate.
According to an embodiment of the invention, the hydrogen containing compound is a macromolecular compound, including polyether polyols.
According to the embodiment of the invention, a plurality of pores are arranged on the fat dissolving particles, the cross sections of the pores are of conical structures, and the size of the conical tip positioned on the outer side of the fat dissolving particles is 10 micrometers.
After the fixing agent and the flame retardant are added into the waterborne polyurethane, the waterborne polyurethane has good tensile strength and flame retardant property, wherein the highest tensile strength can reach 3.6MPa, and the elongation at break can reach 630%.
The polyisocyanate can be absorbed and dissolved into the pores through the porous fat-dissolving particles, so that the polyisocyanate can be uniformly distributed, and the prepared polyisocyanate is in a particle structure, so that the hardness of the waterborne polyurethane can be improved in the preparation process, and the effective area of the particle polyisocyanate in the chain extension reaction can be increased.
Example 3: an aqueous polyurethane for automotive interior and automotive chassis paints comprising: 30 parts of fat dissolving particles; 10 parts of polyisocyanate; 20 parts of a hydrogen-containing compound; 2 parts of a flame retardant; 5 parts of a chain extender; 5 parts of zeolite powder; 0.8 part of epoxy resin curing agent; 0.6 part of organic drier; 40 parts of a water-based curing agent; and 1 part of a foam pore regulator.
According to the embodiment of the invention, the flame retardant is 4-aminobenzene, and the flame retardant is introduced through a chain extension reaction.
According to an embodiment of the invention, the polyisocyanate comprises isophorone diisocyanate.
According to an embodiment of the present invention, the hydrogen-containing compound is a macromolecular compound including a polyol resin emulsion.
According to the embodiment of the invention, the fat dissolving particles are provided with a plurality of pores, the cross section of each pore is of a square structure, and the size of each pore is 5 microns.
After the fixing agent and the flame retardant are added into the waterborne polyurethane, the waterborne polyurethane has good tensile strength and flame retardant property, wherein the highest tensile strength can reach 5.7MPa, and the elongation at break can reach 720%.
The fat dissolving particles can be porous zeolite particles, are polished to be prepared into fat dissolving particles with a preset size, and are sprayed with materials with alkenyl active groups on the surfaces and in pores through a process, the polyisocyanate can be absorbed and dissolved into the pores through the porous fat dissolving particles, so that the polyisocyanate can be uniformly distributed, and the prepared polyisocyanate is in a particle structure, so that the hardness of the waterborne polyurethane can be improved in the preparation process, and the effective area of the granular polyisocyanate in the chain extension reaction can be increased.
In order to achieve the above purpose, the second technical solution adopted by the present invention is: a preparation method of waterborne polyurethane for automotive interior and automotive chassis paint comprises the following steps:
s1, adding polyisocyanate into a container, heating to 15-50 ℃, adding fat-dissolving particles, allowing the polyisocyanate to flow into pores of the fat-dissolving particles to form granular polyisocyanate, and storing for later use;
s2, adding zeolite powder, a water-based curing agent and the zeolite powder into a hydrogen-containing compound to form emulsion, adding the granular polyisocyanate in the S1 into the emulsion prepared by the S2, and stirring and reacting for 2-4 hours at the temperature of 20-80 ℃;
s3, mixing ketimine with an end-NCO polyurethane prepolymer containing an ionic group by a ketimine method, adding a proper amount of water, releasing diamine or hydrazine, and carrying out chain extension on the prepolymer to obtain an aqueous polyurethane-urea dispersion liquid;
and S4, adding the flame retardant, the epoxy resin curing agent and the cell regulator into the aqueous polyurethane-urea dispersion liquid for curing and drying, and stirring for 1-2 hours to obtain the emulsion aqueous polyurethane.
According to the embodiment of the present invention, the surface of the terminal-NCO group of the polyurethane prepolymer having a hydrophilic ionic group and a terminal-NCO can be formed into a protective film by adding methylethylketone imine, pyrrolidone or sodium bisulfite in S3.
The porous fat-dissolving particles can absorb and dissolve the polyisocyanate into the pores, so that the polyisocyanate can be uniformly distributed, and the prepared polyisocyanate is in a particle structure, so that the hardness of the waterborne polyurethane can be improved in the preparation process, and the effective area of the particle polyisocyanate in the chain extension reaction can be increased.
According to the embodiment of the invention, S4 is heated to 50 ℃, and a cross-linking agent is added in the heating process for reaction to form the water-based polyurethane adhesive film with the net structure.
According to the embodiment of the invention, after stirring for 2 hours in S2, the mixture is allowed to stand for 24 hours, and the mixed solution is cooled to normal temperature.
The waterborne polyurethane prepared by the method has moderate viscosity, light color, high brightness and good leveling property, is nontoxic after being cured with epoxy resin, has better insulativity, water resistance and wear resistance, and can play a good protection role when being used for automobile interior trim or automobile chassis paint.
After the fixing agent and the flame retardant are added into the waterborne polyurethane, the waterborne polyurethane has good tensile strength and flame retardant property, wherein the highest tensile strength can reach 6.2MPa, and the highest elongation at break can reach 810%.
In the prepolymer mixing method, when water-soluble primary diamine is used as a chain extender, because the reaction rate of amino and-NCO groups is too high, a dispersion with uniform and fine particle size is difficult to obtain, ketimine is generated by the reaction of ketone and diamine, and ketone-hydrazine is generated by the reaction of ketone and hydrazine. The ketimine/ketone-linked nitrogen does not generate chain extension reaction prematurely when being mixed with the terminal-NCO polyurethane prepolymer containing the ionic group, but when meeting water, the ketimine/ketone-linked nitrogen reacts with the water to release diamine/hydrazine to carry out chain extension on the prepolymer, and the chain extension reaction can be carried out smoothly due to the restriction of the release reaction, so that the waterborne polyurethane-urea dispersion liquid with good performance is obtained.
In light of the foregoing description of the preferred embodiment of the present invention, it is to be understood that various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. An aqueous polyurethane for automotive interior and automotive chassis paints, comprising: 10-30 parts of fat dissolving particles; 10-50 parts of polyisocyanate; 20-40 parts of a hydrogen-containing compound; 0.5-2 parts of a flame retardant; 1-5 parts of a chain extender; 1-5 parts of zeolite powder; 0.5-0.8 part of epoxy resin curing agent; 0.2-0.6 part of organic drier; 10-50 parts of a water-based curing agent; 0.5-1 part of foam pore regulator.
2. The aqueous polyurethane for automotive interiors and automotive chassis paints according to claim 1, wherein: the flame retardant is 4-aminobenzene or phosphorus biphenol oxide, and is introduced through chain extension reaction.
3. The aqueous polyurethane for automotive interiors and automotive chassis paints according to claim 1, wherein: the polyisocyanate can include one or a combination of two or more of toluene diisocyanate or polymethylene polyphenyl polyisocyanate or isophorone diisocyanate.
4. The aqueous polyurethane for automotive interiors and automotive chassis paints according to claim 1, wherein: methods of chain extension by chain extenders include the ketoimine method or the ketodiazo method.
5. The aqueous polyurethane for automotive interiors and automotive chassis paints according to claim 1, wherein: the hydrogen-containing compound is a macromolecular compound and comprises polyester polyol, polyether polyol or polyol resin emulsion.
6. The aqueous polyurethane for automotive interiors and automotive chassis paints according to claim 1, wherein: the fat dissolving particles are provided with a plurality of pores.
7. A process for the preparation of the aqueous polyurethane according to any one of claims 1 to 6 for automotive interiors and automotive chassis paints, comprising the steps of:
s1, adding polyisocyanate into a container, heating to 15-50 ℃, adding fat-dissolving particles, allowing the polyisocyanate to flow into pores of the fat-dissolving particles to form granular polyisocyanate, and storing for later use;
s2, adding zeolite powder, a water-based curing agent and the zeolite powder into a hydrogen-containing compound to form emulsion, adding the granular polyisocyanate in the S1 into the emulsion prepared by the S2, and stirring and reacting for 2-4 hours at the temperature of 20-80 ℃;
s3, mixing ketimine with an end-NCO polyurethane prepolymer containing an ionic group by a ketimine method, adding a proper amount of water, releasing diamine or hydrazine, and carrying out chain extension on the prepolymer to obtain an aqueous polyurethane-urea dispersion liquid;
and S4, adding the flame retardant, the epoxy resin curing agent and the cell regulator into the aqueous polyurethane-urea dispersion liquid for curing and drying, and stirring for 1-2 hours to obtain the emulsion aqueous polyurethane.
8. The aqueous polyurethane for automotive interiors and auto chassis paints according to claim 7, wherein: in S3, a protective film can be formed on the surface of the terminal-NCO group of the polyurethane prepolymer having a hydrophilic ionic group and a terminal-NCO group by adding methyl ethyl ketone imine, pyrrolidone, or sodium bisulfite.
9. The aqueous polyurethane for automotive interiors and auto chassis paints according to claim 7, wherein: s4, heating, adding a cross-linking agent in the heating process for reaction, and forming the net-structure waterborne polyurethane adhesive film.
10. The aqueous polyurethane for automotive interiors and auto chassis paints according to claim 7, wherein: after stirring for 2 hours in S2, the mixture was allowed to stand for 24 hours, and the mixed solution was cooled to room temperature.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010636862.9A CN111732833A (en) | 2020-07-03 | 2020-07-03 | Waterborne polyurethane for automotive interior and automotive chassis paint |
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| CN202010636862.9A CN111732833A (en) | 2020-07-03 | 2020-07-03 | Waterborne polyurethane for automotive interior and automotive chassis paint |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115260941A (en) * | 2022-08-24 | 2022-11-01 | 苏州瑞高新材料有限公司 | Dirt-resistant leather product for automobile interior decoration and preparation method thereof |
| CN115521666A (en) * | 2022-09-29 | 2022-12-27 | 英德市东顺精细化工实业有限公司 | Flame-retardant insulating chassis armor suitable for new energy vehicle |
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| CN115521666A (en) * | 2022-09-29 | 2022-12-27 | 英德市东顺精细化工实业有限公司 | Flame-retardant insulating chassis armor suitable for new energy vehicle |
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