CN109354987B - Polyaspartic acid ester polyurea coating with moderate surface drying time and capable of adapting to environmental change, preparation method, use method and application - Google Patents
Polyaspartic acid ester polyurea coating with moderate surface drying time and capable of adapting to environmental change, preparation method, use method and application 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
- 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
- C09D175/02—Polyureas
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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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
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- 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
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
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- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
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- C08K2201/00—Specific properties of additives
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Abstract
The invention belongs to the technical field of spray polyurea elastic materials, and discloses a polyaspartic ester polyurea coating which has moderate surface drying time and can adapt to environmental changes, and the polyaspartic ester polyurea coating is mainly prepared from the following raw materials: the composite material comprises a material A and a material B, wherein the molar ratio of NCO in the material A to NH in the material B is 1.05-1.1; the material A is mainly prepared from the following raw materials in percentage by weight: 25-44% of polyether polyol, 55-74% of aliphatic polyisocyanate and 1-5% of nano graphene oxide; the material B is mainly prepared from the following raw materials in percentage by weight: 70-80% of polyaspartic acid ester, 10-15% of nano metal oxide filler, 5-10% of pigment filler, 1-3% of defoaming agent, 1-3% of flatting agent and 2-5% of adhesion promoter. The invention also provides a preparation method, a using method and application of the polyaspartic ester polyurea coating. The polyaspartic acid ester polyurea coating provided by the invention has the advantages of easiness in coating, moderate surface drying time and adaptability to environmental changes.
Description
Technical Field
The invention belongs to the technical field of spray polyurea elastic materials, and particularly relates to a polyaspartic acid ester polyurea coating which has moderate surface drying time and can adapt to environmental changes, a preparation method, a use method and application.
Background
The spray polyurea elastic material is a reactive coating product without solvent pollution developed in recent years at home and abroad, and fully shows the advantages of the spray polyurea elastic material in the technical field of water resistance with excellent physicochemical property, excellent public welfare and environmental protection property since the coming out, and is rapidly developed with incomparable superiority. The polyurea coating is hydrophobic and autocatalytic, and has better physical and mechanical properties, tensile strength, wear resistance, impact resistance, chemical corrosion resistance and waterproof performance.
The polyurea coating elastomer coating can realize different reaction systems by selecting proper isocyanate components and amino components, wherein the rapid reaction system can be used for parts needing rapid forming, strengthening and repairing, and the slow reaction system is suitable for various sealing and gap filling. The polyurea coating has high strength and good toughness, can be functionalized, and has wide application prospect in the field of military and civil use.
The performance of the coating determines the protective effect of the coating, and the protective coating used in the anticorrosion field has the following advantages: the mechanical property is good, and the rain wash collision and even friction resistance is realized; good stability, acid and alkali resistance, chemical resistance, oil resistance, aging resistance and ultraviolet resistance; the adhesive force is strong, and the adhesive force and the adhesive property with the substrate are strong; easy construction and environmental protection. In addition, the coating is also required to have barrier properties, hydrophobicity, stain resistance, service life, and the like.
The polyurea elastomer coating is generated by the reaction of amino compounds and isocyanate, and is mainly used for marine bridge anticorrosion. The two-component pure polyurea elastomer coating is a novel, efficient and easily-coated two-component pure polyurea elastomer coating which is developed after high-solid and powder coatings, water-based coatings, photocureable coatings and the like, is successfully researched and developed by the United states at the end of the last 80 years, and is widely applied in the world due to excellent performance. The high thick film elastomer coating has the following characteristics: the coating has the advantages of high solid content, environmental protection, thick, compact and flexible coating film, strong adhesion with a substrate, excellent ultraviolet resistance, impact resistance and other properties, and simple and convenient construction. The research of adding different amounts of polyurea elastomer shows that when the molar fraction of polyurea content reaches 50%, the self-assembly effect initiated by hydrogen bonds increases the crystallinity of the copolymer, the corrosion resistance of the coating is enhanced, and the surface energy is reduced. The pure polyurea heavy-duty anticorrosive coating is coated, is subjected to exposure aging in an artificial marine atmospheric environment, and is tested for performances by infrared spectroscopy, DSC and the like, so that the coating has good mechanical property and ultraviolet resistance, stable structure and excellent corrosion resistance.
Although polyurea elastomer coatings have the above advantages, they also have some drawbacks that hinder their application and development: such as too fast curing speed, poor interlayer adhesion, inferior high temperature resistance and corrosion resistance than fluorocarbon coatings, and the like, and the defects are related to the main film forming substance in the spray polyurea waterproof coating and the preparation process thereof, and are also related to the types of the added auxiliary agents. In addition, the spraying of the polyurea elastomer coating is an advanced technology, and the quality and the technology of constructors are also reasons for influencing the performance of the polyurea elastomer coating; secondly, the main raw materials and spraying equipment need to be imported, which causes high cost and is an important reason for restricting the development of polyurea elastomer coatings in China.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a polyaspartic ester polyurea coating which has moderate surface drying time, can adapt to environmental changes and can adapt to more occasions where the coating is applied, and meanwhile, the invention also provides a preparation method, a use method and application of the polyaspartic ester polyurea coating.
The technical scheme adopted by the invention is as follows:
a polyaspartic acid ester polyurea coating with moderate surface drying time and capability of adapting to environmental change is mainly prepared from the following raw materials: the composite material comprises a material A and a material B, wherein the molar ratio of NCO in the material A to NH in the material B is 1.05-1.1;
the material A is mainly prepared from the following raw materials in percentage by weight: 25-44% of polyether polyol, 55-74% of aliphatic polyisocyanate and 1-5% of nano graphene oxide;
the material B is mainly prepared from the following raw materials in percentage by weight: 70-80% of polyaspartic acid ester, 10-15% of nano metal oxide filler, 5-10% of pigment filler, 1-3% of defoaming agent, 1-3% of flatting agent and 2-5% of adhesion promoter.
Specifically, the polyaspartic acid ester polyurea coating is prepared from aliphatic diamine and maleic acid ester, wherein the aliphatic diamine is one or more of isophorone diamine, dicyclohexyl methane diamine, 1, 6-hexamethylene diamine or 3,3 '-dimethyl 4, 4' -dicyclohexyl methane diamine, and the maleic acid ester is one or more of diethyl maleate, dimethyl maleate and dibutyl maleate.
Specifically, the polyether polyol of the polyaspartic acid ester polyurea coating is one or more of polytetrahydrofuran dihydric alcohol, polytetrahydrofuran trihydric alcohol, polyethylene glycol dihydric alcohol or polyethylene glycol trihydric alcohol.
Specifically, in the polyaspartic acid ester polyurea coating, the aliphatic polyisocyanate is one or more of isophorone diisocyanate, hexamethylene diisocyanate trimer, cyclohexane dimethylene isocyanate, and 4, 4-dicyclohexylmethane diisocyanate.
Specifically, the nano metal oxide filler of the polyaspartic acid ester polyurea coating is nano titanium dioxide and/or nano ferroferric oxide.
Specifically, the pigment and filler of the polyaspartic acid ester polyurea coating is one or more of aluminum dihydrogen tripolyphosphate, modified silicon micropowder, barium sulfate, talcum powder or kaolin.
A preparation method of the polyaspartic ester polyurea coating comprises the following steps:
(1) weighing polyether polyol, aliphatic polyisocyanate and nano graphene oxide according to the amount, stirring and uniformly mixing, and reacting after heating to obtain a material A;
(2) weighing aliphatic diamine according to the amount, heating, adding diethyl maleate, and carrying out heat preservation reaction to obtain polyaspartic acid ester;
(3) weighing the polyaspartic ester obtained in the step (2) according to the amount, and preheating to obtain preheated polyaspartic ester;
(4) respectively weighing nano metal oxide filler, pigment filler, defoaming agent, flatting agent and adhesion promoter according to the weight, adding the nano metal oxide filler, pigment filler, defoaming agent, flatting agent and adhesion promoter into preheated polyaspartic ester, and dispersing at a high speed to obtain material B;
(5) and uniformly mixing the material A and the material B according to the molar ratio of NCO in the material A to NH in the material B of 1.05-1.1 to obtain the polyaspartic ester polyurea coating.
Specifically, in the preparation method, the temperature in the step (1) is raised to 70-90 ℃, and the reaction time is 8-16h after the temperature is raised; heating to 70-90 ℃ in the step (2), wherein the diethyl maleate is added dropwise, the dripping time of the diethyl maleate is 28-32min, the reaction temperature of the heat preservation reaction is 84-86 ℃, and the reaction time of the heat preservation reaction is 22-26 h; the preheating temperature in the step (3) is 48-52 ℃; in the step (5), the NCO mole content of the material A accounts for 10-15% of the total moles of all reaction substrates in the material A.
The application method of the polyaspartic ester polyurea coating comprises the step of coating the polyaspartic ester polyurea coating on a primer layer or a middle coating layer in a rolling, brushing or spraying mode, wherein the dosage of the polyaspartic ester polyurea coating is 0.15kg/m2。
An application of the polyaspartic acid ester polyurea coating in preparing bridge, outdoor building, concrete and furniture decorative coatings.
The invention has the beneficial effects that:
because the polyurea coating taking the aromatic compound as the raw material is easy to age and has poor weather resistance, the aliphatic polyisocyanate is used as the raw material to prepare the polyurea waterproof coating, so that the light stability and the weather resistance of the polyurea waterproof coating can be effectively improved, and the coating has excellent yellowing resistance, antifouling performance and anticorrosion performance while having the waterproof performance. Meanwhile, aliphatic diamine and maleic acid ester are selected to prepare polyaspartic acid ester, so that the wettability of the polyurea coating is further improved on the basis of ensuring the low viscosity and easy spraying performance of the coating, the curing speed is moderate, and the construction time is prolonged. Meanwhile, the polyaspartic ester polyurea coating system provided by the invention has the advantages of low reaction speed and longer gel time, can be constructed by using traditional spraying equipment without purchasing expensive static mixed bi-component spraying equipment, and is simple and easy to operate and convenient to popularize.
Detailed Description
The present invention is further illustrated below with reference to specific examples.
Example 1
The embodiment aims to provide a polyaspartic ester polyurea coating which has moderate surface drying time and can adapt to environmental changes, and the method specifically comprises the following steps:
(1) preparation of material A:
weighing 25% of polytetrahydrofuran diol, 74% of isophorone diisocyanate and 1% of nano graphene oxide in percentage by weight, adding the weighed materials into a three-necked bottle with a stirrer, a heating device and a condenser, heating to 70 ℃, mixing, reacting for 12 hours, measuring the content of NCO, and synthesizing a prepolymer of which the mole number of the NCO is 10% of the total mole number of reaction substrates;
(2) preparation of the component B:
weighing corresponding amount of isophorone diamine, adding the isophorone diamine into a three-necked bottle with a stirrer, a heating device and a condenser, heating to 70 ℃, dropwise adding corresponding amount of diethyl maleate for 30min, and reacting at 85 ℃ for 24h to obtain polyaspartic ester; weighing 70% of polyaspartic acid ester, preheating to 50 ℃, then weighing 30% of filler mixture and auxiliary agent (comprising 10% of nano titanium dioxide, 10% of aluminium dihydrogen tripolyphosphate, 3% of defoaming agent, 3% of flatting agent and 4% of adhesion promoter) respectively, and adding the filler mixture and the auxiliary agent into the preheated polyaspartic acid ester to obtain material B; and dispersing at high speed to obtain dispersed material A and material B.
(3) Preparation of polyaspartic acid ester polyurea coating:
and mixing the dispersed material A and the material B according to the NCO content and NH content molar ratio of 1.05 to obtain the polyaspartic acid ester polyurea coating.
Example 2
The embodiment aims to provide a polyaspartic ester polyurea coating which has moderate surface drying time and can adapt to environmental changes, and the method specifically comprises the following steps:
(1) preparation of material A:
weighing 30% of polytetrahydrofuran triol, 67% of hexamethylene diisocyanate and 3% of nano graphene oxide in percentage by weight, adding the polytetrahydrofuran triol, the hexamethylene diisocyanate and the nano graphene oxide into a three-necked bottle with a stirrer, a heating device and a condenser, heating to 75 ℃, mixing, reacting for 8 hours, measuring the content of NCO, and synthesizing a prepolymer of which the mole number of the NCO is 15% of the total mole number of reaction substrates;
(2) preparation of the component B:
weighing dicyclohexylmethanediamine with corresponding weight, adding the dicyclohexylmethanediamine into a three-necked bottle with a stirrer, a heating device and a condenser, heating to 75 ℃, dropwise adding diethyl maleate with corresponding weight for 30min, and reacting at 85 ℃ for 24h to obtain polyaspartic acid ester; weighing 80% of polyaspartic acid ester, preheating to 50 ℃, then weighing 20% of filler mixture and auxiliary agent (comprising 11% of nano titanium dioxide, 5% of modified silicon micropowder, 1% of defoaming agent, 1% of flatting agent and 2% of adhesion promoter) respectively, and adding the filler mixture and the auxiliary agent into the preheated polyaspartic acid ester to obtain material B; and dispersing at high speed to obtain dispersed material A and material B.
(3) Preparation of polyaspartic acid ester polyurea coating:
and mixing the dispersed material A and the material B according to the NCO content and NH content molar ratio of 1.05 to obtain the polyaspartic acid ester polyurea coating.
Example 3
The embodiment aims to provide a polyaspartic ester polyurea coating which has moderate surface drying time and can adapt to environmental changes, and the method specifically comprises the following steps:
(1) preparation of material A:
weighing 35% of polyethylene glycol diol, 60% of hexamethylene diisocyanate trimer and 5% of nano graphene oxide by weight percent, adding the weighed materials into a three-necked bottle with a stirrer, a heating device and a condenser, heating to 80 ℃, mixing, reacting for 14 hours, measuring the content of NCO, and synthesizing a prepolymer of which the mole number of the NCO is 10% of the total mole number of reaction substrates;
(2) preparation of the component B:
weighing 1, 6-hexanediamine with corresponding weight, adding into a three-necked flask equipped with a stirrer, a heating device and a condenser, heating to 80 ℃, dropwise adding diethyl maleate with corresponding weight for 30min, and reacting at 85 ℃ for 24h to obtain polyaspartic acid ester; weighing 76% of polyaspartic acid ester, preheating to 50 ℃, then weighing 24% of filler mixture and auxiliary agent (comprising 15% of nano titanium dioxide, 5% of barium sulfate, 1% of defoaming agent, 1% of flatting agent and 2% of adhesion promoter) respectively, and adding the filler mixture and the auxiliary agent into the preheated polyaspartic acid ester to obtain material B; and dispersing at high speed to obtain dispersed material A and material B.
(3) Preparation of polyaspartic acid ester polyurea coating:
and mixing the dispersed material A and the material B according to the NCO content and NH content molar ratio of 1.05 to obtain the polyaspartic acid ester polyurea coating.
Example 4
The embodiment aims to provide a polyaspartic ester polyurea coating which has moderate surface drying time and can adapt to environmental changes, and the method specifically comprises the following steps:
preparation of material A:
weighing 44% of polyethylene glycol triol, 51% of cyclohexane dimethylene isocyanate and 5% of nano graphene oxide, adding the weighed materials into a three-necked bottle provided with a stirrer, a heating device and a condenser, heating to 90 ℃, mixing, reacting for 16 hours, measuring the content of NCO, and synthesizing a prepolymer of which the mole number of the NCO is 10% of the total mole number of reaction substrates;
preparation of the component B:
weighing 3,3 '-dimethyl 4, 4' -dicyclohexylmethanediamine with corresponding weight, adding into a three-necked bottle with a stirrer, a heating device and a condenser, heating to 90 ℃, dropwise adding diethyl maleate with corresponding weight for 30min, and reacting at 85 ℃ for 24h to obtain polyaspartic acid ester; weighing 72% of polyaspartic acid ester, preheating to 50 ℃, then weighing 28% of filler mixture and auxiliary agent (comprising 13% of nano ferroferric oxide, 8% of talcum powder, 2% of defoaming agent, 2% of flatting agent and 3% of adhesion promoter) respectively, and adding the filler mixture and the auxiliary agent into the preheated polyaspartic acid ester to obtain material B; and dispersing at high speed to obtain dispersed material A and material B.
(3) Preparation of polyaspartic acid ester polyurea coating:
and mixing the dispersed material A and the material B according to the NCO content and NH content molar ratio of 1.05 to obtain the polyaspartic acid ester polyurea coating.
Example 5
The embodiment aims to provide a polyaspartic ester polyurea coating which has moderate surface drying time and can adapt to environmental changes, and the method specifically comprises the following steps:
preparation of material A:
weighing 43% of polyethylene glycol triol, 54% of 4, 4-dicyclohexylmethane diisocyanate and 3% of nano graphene oxide, adding the mixture into a three-necked bottle with a stirrer, a heating device and a condenser, heating to 80 ℃, mixing, reacting for 13 hours, measuring the content of NCO, and synthesizing a prepolymer of which the mole number of NCO is 15% of the total mole number of reaction substrates;
preparation of the component B:
weighing 3,3 '-dimethyl 4, 4' -dicyclohexylmethanediamine with corresponding weight, adding into a three-necked bottle with a stirrer, a heating device and a condenser, heating to 80 ℃, dropwise adding diethyl maleate with corresponding weight for 30min, and reacting at 85 ℃ for 24h to obtain polyaspartic acid ester; weighing 70% of polyaspartic acid ester, preheating to 50 ℃, then respectively weighing 30% of filler mixture and auxiliary agent (comprising 12% of nano ferroferric oxide, 8% of kaolin, 2% of defoaming agent, 3% of flatting agent and 5% of adhesion promoter), and adding the filler mixture and the auxiliary agent into the preheated polyaspartic acid ester to obtain material B; and dispersing at high speed to obtain dispersed material A and material B.
(3) Preparation of polyaspartic acid ester polyurea coating:
and mixing the dispersed material A and the material B according to the NCO content and NH content molar ratio of 1.05 to obtain the polyaspartic acid ester polyurea coating.
The maleic acid ester in the invention can be one or more of diethyl maleate, dimethyl maleate and dibutyl maleate besides diethyl maleate. In addition, the aliphatic diamine, polyether polyol, aliphatic polyisocyanate, nano metal oxide filler and pigment filler used in the present invention are not limited to the single reactant in examples 1 to 5, and may be one or more of the above listed raw materials, such as aluminum dihydrogen tripolyphosphate, modified silicon micropowder, barium sulfate, talc powder or kaolin.
The CAS number or goods number and other specific information of the raw materials used by the polyaspartic ester polyurea coating provided by the invention are as follows:
aliphatic diamine: isophoronediamine (CAS No.2855-13-2), dicyclohexylmethanediamine, 1, 6-hexamethylenediamine (CAS No.124-09-4) or 3,3 '-dimethyl-4, 4' -dicyclohexylmethanediamine (CAS No. 6864-37-5);
maleic acid ester: diethyl maleate (CAS No.141-05-9), dimethyl maleate (CAS No.624-48-6), dibutyl maleate (CAS No. 105-76-0);
polyether polyol: polytetrahydrofuran diol, polytetrahydrofuran triol, polyethylene glycol diol or polyethylene glycol triol (Jining HuaKai resin Co., Ltd.);
aliphatic polyisocyanate: isophorone diisocyanate (CAS No.4098-71-9), hexamethylene diisocyanate (CAS No.822-06-0), hexamethylene diisocyanate trimer, cyclohexane dimethylene isocyanate or 4, 4-dicyclohexylmethane diisocyanate (Shenzhen Jinhuasheng chemical Co., Ltd.);
nano metal oxide filler: nanometer titanium dioxide, and nanometer ferroferric oxide (Ningbo Jinlei nanometer materials science and technology Co., Ltd.).
Pigment and filler: aluminium dihydrogen tripolyphosphate (CAS No.17375-35-8), modified silicon micropowder, barium sulfate (CAS No.7727-43-7), pulvis Talci (CAS No.14807-96-6) or Kaolin (CAS No. 52624-41-6);
defoamer (sichuan jia baoli paint ltd), leveling agent (sichuan jia baoli paint ltd), adhesion promoter (sichuan jia baoli paint ltd).
Effect example 1
Respectively reacting 1, 6-hexamethylene diamine, dicyclohexylmethane diamine, 3 '-dimethyl 4, 4' -dicyclohexylmethane diamine and isophorone diamine with diethyl maleate to obtain 4 polyaspartic esters 1#, 2#, 3# and 4#, and mixing the obtained polyaspartic esters 1#, 2#, 3# and 4# with other components in the material B to obtain four different materials B; the mol number of NCO in the material A is 10 percent of the total mol number of the reaction substrates; the material A was reacted with four different materials B at a molar ratio NCO/NH of 1.05, and the gel time and the tack free time were measured using a stopwatch, the results of which are shown in Table 1:
table 1 effects the gel time and tack free time of the polyaspartic ester polyurea coating in example 1
| Polyurea type | Gel time (25 deg.C)/min | Surface drying time (25 deg.C)/min |
| 1# | 0.5～1 | 2～3 |
| 2# | 45～60 | 120～180 |
| 3# | 60～90 | 180～240 |
| 4# | 5～10 | 20～30 |
Effect example 2
Respectively reacting 1, 6-hexamethylene diamine, dicyclohexyl methane diamine, 3 '-dimethyl 4, 4' -dicyclohexyl methane diamine and isophorone diamine with diethyl maleate to obtain 4 polyaspartic esters 1#, 2#, 3# and 4#, mixing the obtained polyaspartic esters 1#, 2#, 3# and 4# with other components in the material B to obtain four different materials B, wherein the mol number of NCO in the material A is 15% of the total mol number of a reaction substrate; the material A was then reacted with four different materials B at a molar ratio NCO/NH of 1.05 and the gel time and open time were measured using a stopwatch, the results of which are shown in Table 2:
table 2 effects the gel time and tack free time of the polyaspartic acid ester polyurea coating in example 2
| Polyurea type | Gel time (25 deg.C)/min | Surface drying time (25 deg.C)/min |
| 1# | 0.5～1 | 2～3 |
| 2# | 45～60 | 120～180 |
| 3# | 60～90 | 180～240 |
| 4# | 5～10 | 20～30 |
Effect example 3
Respectively reacting 1, 6-hexamethylene diamine, dicyclohexyl methane diamine, 3 '-dimethyl 4, 4' -dicyclohexyl methane diamine and isophorone diamine with diethyl maleate to obtain 4 polyaspartic esters 1#, 2#, 3# and 4#, mixing the obtained polyaspartic esters 1#, 2#, 3# and 4# with other components in the material B to obtain four different materials B, wherein the mol number of NCO in the material A is 10% of the total mol number of a reaction substrate; the material A was then reacted with four different materials B at a molar ratio NCO/NH of 1.1, and the gel time and open time were measured using a stopwatch, the results of which are shown in Table 3:
table 3 effects the gel time and tack free time of the polyaspartic ester polyurea coating in example 3
| Polyurea type | Gel time (25 deg.C)/min | Surface drying time (25 deg.C)/min |
| 1# | 0.5～1 | 2～3 |
| 2# | 45～60 | 120～180 |
| 3# | 60～90 | 180～240 |
| 4# | 5～10 | 20～30 |
The polyether polyol in the component a in the effect examples 1 to 3 may be polytetrahydrofuran diol, polytetrahydrofuran triol, polyethylene glycol diol or polyethylene glycol triol, and the aliphatic polyisocyanate in the component a may be isophorone diisocyanate, hexamethylene diisocyanate trimer, cyclohexane dimethylene isocyanate or 4, 4-dicyclohexylmethane diisocyanate. From the results of effect examples 1 to 3, it is understood that when different aliphatic diamines were selected to prepare the coating, the obtained coating had a wide range of changes in gel time and open time, and was suitable for most of the use cases.
The present invention is not limited to the above-described alternative embodiments, and various other forms of products can be obtained by anyone in light of the present invention. The above detailed description should not be taken as limiting the scope of the invention, which is defined in the claims, and which the description is intended to be interpreted accordingly.
Claims (8)
1. A polyaspartic acid ester polyurea coating with moderate surface drying time and capability of adapting to environmental change is characterized by being mainly prepared from the following raw materials: the composite material comprises a material A and a material B, wherein the molar ratio of NCO in the material A to NH in the material B is 1.05-1.1;
the material A is mainly prepared from the following raw materials in percentage by weight: 25-44% of polyether polyol, 55-74% of aliphatic polyisocyanate and 1-5% of nano graphene oxide;
the material B is mainly prepared from the following raw materials in percentage by weight: 70-80% of polyaspartic acid ester, 10-15% of nano metal oxide filler, 5-10% of pigment filler, 1-3% of defoaming agent, 1-3% of flatting agent and 2-5% of adhesion promoter;
the preparation method of the polyaspartic ester polyurea coating comprises the following steps:
(1) weighing polyether polyol, aliphatic polyisocyanate and nano graphene oxide according to the amount, stirring and uniformly mixing, and reacting after heating to obtain a material A;
(2) weighing aliphatic diamine according to the amount, heating, adding diethyl maleate, and carrying out heat preservation reaction to obtain polyaspartic acid ester;
(3) weighing the polyaspartic ester obtained in the step (2) according to the amount, and preheating to obtain preheated polyaspartic ester;
(4) respectively weighing nano metal oxide filler, pigment filler, defoaming agent, flatting agent and adhesion promoter according to the weight, adding the nano metal oxide filler, pigment filler, defoaming agent, flatting agent and adhesion promoter into preheated polyaspartic ester, and dispersing at a high speed to obtain material B;
(5) uniformly mixing the material A and the material B according to the molar ratio of NCO in the material A to NH in the material B of 1.05-1.1 to obtain the polyaspartic ester polyurea coating;
heating to 70-90 ℃ in the step (1), wherein the reaction time is 8-16h after heating; heating to 70-90 ℃ in the step (2), wherein the diethyl maleate is added dropwise, the dripping time of the diethyl maleate is 28-32min, the reaction temperature of the heat preservation reaction is 84-86 ℃, and the reaction time of the heat preservation reaction is 22-26 h; the preheating temperature in the step (3) is 48-52 ℃; in the step (5), the NCO mole content of the material A accounts for 10-15% of the total moles of all reaction substrates in the material A.
2. The polyaspartate polyurea coating of claim 1, wherein: the polyaspartic acid ester is prepared from aliphatic diamine and maleic acid ester, wherein the aliphatic diamine is one or more of isophorone diamine, dicyclohexyl methane diamine, 1, 6-hexamethylene diamine or 3,3 '-dimethyl 4, 4' -dicyclohexyl methane diamine, and the maleic acid ester is one or more of diethyl maleate, dimethyl maleate and dibutyl maleate.
3. The polyaspartate polyurea coating of claim 1, wherein: the polyether polyol is one or more of polytetrahydrofuran dihydric alcohol, polytetrahydrofuran trihydric alcohol, polyethylene glycol dihydric alcohol or polyethylene glycol trihydric alcohol.
4. The polyaspartate polyurea coating of claim 1, wherein: the aliphatic polyisocyanate is one or more of isophorone diisocyanate, hexamethylene diisocyanate trimer, cyclohexane dimethylene isocyanate or 4, 4-dicyclohexylmethane diisocyanate.
5. The polyaspartate polyurea coating of claim 1, wherein: the nano metal oxide filler is nano titanium dioxide and/or nano ferroferric oxide.
6. The polyaspartate polyurea coating of claim 1, wherein: the pigment and filler is one or more of aluminum dihydrogen tripolyphosphate, modified silicon micropowder, barium sulfate, talcum powder or kaolin.
7. A method according to any one of claims 1 to 6The application method of the polyaspartic acid ester polyurea coating is characterized in that: the polyaspartic ester polyurea coating is coated on the primer layer or the intermediate coating layer in a rolling, brushing or spraying way, and the dosage of the polyaspartic ester polyurea coating is 0.15kg/m2。
8. Use of a polyaspartate polyurea coating according to any of claims 1-6 for the preparation of a bridge, exterior building, concrete and furniture decorative coating.
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