CN111620994A - Epoxy resin modified aqueous polyurethane oil dispersion and preparation method and application thereof - Google Patents
Epoxy resin modified aqueous polyurethane oil dispersion and preparation method and application thereof Download PDFInfo
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- 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
- C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
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- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
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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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- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
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- C08G18/00—Polymeric products of isocyanates or isothiocyanates
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- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
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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
- C09D5/08—Anti-corrosive paints
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Abstract
The invention discloses an epoxy resin modified aqueous polyurethane oil dispersion, a preparation method and application thereof. The raw materials for preparing the epoxy resin modified waterborne polyurethane oil dispersion comprise the following components: 13-18 parts of epoxy resin, 13-18 parts of dry vegetable oil acid, 0.1-0.5 part of alcoholysis catalyst, 5-8 parts of polyol, 4-8 parts of hydrophilic monomer, 4-8 parts of diisocyanate compound and 1-2 parts of neutralizing agent. The epoxy resin modified water-based polyurethane oil dispersion is suitable for metal protective coatings, and has the advantages of low VOC (volatile organic compound), environmental friendliness, high drying speed, high hardness, good water resistance, good salt spray resistance and the like.
Description
Technical Field
The invention relates to a water-based polyurethane oil dispersion, in particular to an epoxy resin modified water-based polyurethane oil dispersion and a preparation method and application thereof.
Background
Volatile Organic Compounds (VOC) are one of the most important pollutants in air pollution, and therefore, there is a need to start the upgrading of oil to water in the paint industry to reduce the emission of VOC. The water-based paint takes water as a dispersion medium, has the advantages of low combustion, small smell, low toxicity, low pollution and the like, meets the low-carbon green environmental protection requirement which is widely concerned in the world at present, and becomes a mainstream research hotspot.
The water-based polyurethane oil dispersion can be subjected to oxidative crosslinking with oxygen in the air under the action of a metal catalyst due to the fact that the vegetable oil fatty acid containing unsaturated carbon-carbon double bonds can be used for further improving the water resistance and chemical resistance of the water-based polyurethane dispersion; meanwhile, the long-chain nonpolar fatty acid chain can enable the coating film to have a good hydrophobic effect, can endow the coating with good flexibility and high gloss, and is commonly used as a metal protective coating with high environmental protection requirements at present. Most of the preparation methods of the aqueous polyurethane oil dispersion are that under the action of a catalyst (lithium hydroxide and the like), alcoholysis is carried out on dry unsaturated oil (linseed oil, soybean oil and the like) and polyol (glycerol, pentaerythritol and the like), hydroxyl parts are combined with diisocyanate (TDI, HDI and the like), hydrophilic monomer (DMPA and the like) is introduced, and finally triethylamine neutralization salification is carried out to obtain the aqueous polyurethane oil dispersion. However, the aqueous polyurethane oil dispersion still cannot meet the metal protective coating with high requirements on salt mist resistance and acid and alkali resistance, because ester bond parts in the aqueous polyurethane oil dispersion are easily hydrolyzed to form small molecules under high salt mist and acid and alkali corrosion conditions, so that the protective effect on a substrate is lost.
Therefore, it is necessary to develop a water-based urethane oil dispersion having excellent salt spray resistance and acid and alkali resistance.
Disclosure of Invention
In view of the deficiencies of the prior art in aqueous urethane oil dispersions, it is an object of one aspect of the present invention to provide an epoxy modified aqueous urethane oil dispersion. The epoxy resin modified water-based polyurethane oil dispersion not only has the advantages of high gloss, high flexibility and the like of the water-based polyurethane oil dispersion, but also has the advantages of high drying speed, salt mist resistance, good acid and alkali resistance, and can be widely used for water-based metal protective coatings. In order to realize the purpose of the invention, the technical scheme of the invention is as follows:
an epoxy resin modified aqueous polyurethane oil dispersion, the silicone rubber comprises the following components by weight:
preferably, the epoxy resin is selected from one or more of E-20 epoxy resin, E-44 epoxy resin and E-51 epoxy resin.
Preferably, the dry vegetable oil acid is selected from one or more of linoleic acid, soybean oil acid, eleostearic acid, dehydrated ricinoleic acid, abietic acid and cottonseed oil acid.
Preferably, the alcoholysis catalyst is selected from one or more of N, N-dimethylaniline, triethylamine, triethanolamine and diethanolamine.
Preferably, the polyol is one or more selected from glycerol, pentaerythritol, dipentaerythritol, neopentyl glycol, diethylene glycol, ethylene glycol, trimethylolpropane, trimethylolethane and polyether polyols.
Preferably, the hydrophilic monomer is selected from one or more of dimethylolpropionic acid, dimethylolbutyric acid, dimethylolvaleric acid and dimethylolnonanoic acid.
Preferably, the diisocyanate compound is one or more selected from the group consisting of toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, trimethylhexamethylene diisocyanate, dicyclohexylmethane diisocyanate, xylylene diisocyanate, tetramethylxylylene diisocyanate, and hexahydrotoluene diisocyanate.
Preferably, the neutralizing agent is one or more selected from the group consisting of N, N-dimethylethanolamine, 2-amino-2-methyl-1-propanol, ammonia, triethylamine, triethanolamine, diethylamine and diethanolamine.
In another aspect, the present invention provides a method for preparing an epoxy resin modified aqueous polyurethane oil dispersion, comprising the steps of:
(1) putting epoxy resin, 13-18 parts by weight of dry vegetable oleic acid and 0.1-0.5 part by weight of alcoholysis catalyst into a reaction kettle, introducing nitrogen until the pressure is 0.05-0.1 mpa, heating to 150-160 ℃ under a stirring state, keeping the temperature for 1 hour, continuously heating to 200-210 ℃ and keeping the temperature until the acid value is less than 1.5 mg of potassium hydroxide/g;
(2) after the acid value is qualified, cooling the reaction system to 110-120 ℃, adding 5-8 parts by weight of polyhydric alcohol and 4-8 parts by weight of hydrophilic monomer, and stirring for dissolving for 20-40 minutes;
(3) distilling under reduced pressure, removing all water, cooling to 60-70 ℃, then dropwise adding 4-8 parts by weight of diisocyanate compound, and finishing dropping within 1.5-2.0 hours; after the dropwise addition is finished, heating to 75-85 ℃, and reacting for 0.5-0.6 hour at the temperature until the viscosity of the reaction system is 20000 cps/30-30000 cps/30 ℃;
(4) after the viscosity is qualified, cooling the reaction system to 40-50 ℃, putting 1-2 parts by weight of neutralizing agent into the reaction kettle, stirring for 20-40 minutes, and then dropwise adding 60-65 parts by weight of deionized water into the reaction system; and after the dropwise addition is finished, continuously stirring for 20-40 minutes to obtain the epoxy resin modified water-based polyurethane oil dispersion.
The solid content of the epoxy resin modified aqueous urethane oil dispersion prepared by the preparation method is 33 to 37 weight percent.
Preferably, the epoxy resin is selected from one or more of E-20 epoxy resin, E-44 epoxy resin and E-51 epoxy resin.
Preferably, the dry vegetable oil acid is selected from one or more of linoleic acid, soybean oil acid, eleostearic acid, dehydrated ricinoleic acid, abietic acid and cottonseed oil acid.
Preferably, the alcoholysis catalyst is selected from one or more of N, N-dimethylaniline, triethylamine, triethanolamine and diethanolamine.
Preferably, the polyol is one or more selected from glycerol, pentaerythritol, dipentaerythritol, neopentyl glycol, diethylene glycol, ethylene glycol, trimethylolpropane, trimethylolethane and polyether polyols.
Preferably, the hydrophilic monomer is selected from one or more of dimethylolpropionic acid, dimethylolbutyric acid, dimethylolvaleric acid and dimethylolnonanoic acid.
Preferably, the diisocyanate compound is one or more selected from the group consisting of toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, trimethylhexamethylene diisocyanate, dicyclohexylmethane diisocyanate, xylylene diisocyanate, tetramethylxylylene diisocyanate, and hexahydrotoluene diisocyanate.
Preferably, in the step (4), the neutralizing agent is selected from one or more of N, N-dimethylethanolamine, 2-amino-2-methyl-1-propanol, ammonia, triethylamine, triethanolamine, diethylamine and diethanolamine.
In a further aspect, the present invention provides the use of the epoxy resin modified aqueous urethane oil dispersion as described above for a metal barrier coating.
The drying speed of the epoxy resin modified waterborne polyurethane oil dispersion is as follows: the surface drying can reach 7-10 min, the solid drying can reach 2.5-3 hr (GB/T1728-79 finger contact method (temperature 23 +/-2 ℃/humidity 50 +/-5 percent)), and the salt spray resistance can reach 250-280 hr (GB-T10125-1997 artificial atmosphere corrosion test salt spray test); the acid and alkali resistance is as follows: the 5% sodium hydroxide solution can reach 115-130 hr, and the 5% hydrochloric acid solution can reach 105-110 hr (GB9274-88 immersion method in determination of liquid-resistant medium for colored paint and varnish).
According to the epoxy resin modified water-based polyurethane oil dispersion disclosed by the invention, the epoxy resin is used for carrying out chemical grafting modification on the water-based polyurethane oil dispersion, so that an ester bond part existing in the water-based polyurethane oil dispersion is effectively protected, and the water-based polyurethane oil dispersion is prevented from being hydrolyzed to form small molecules under the conditions of high salt mist and acid-base corrosion. On the basis of keeping the original advantages of high gloss, high flexibility and the like of the aqueous polyurethane oil dispersion, the drying speed, the salt spray resistance, the acid and alkali resistance and the like of the original aqueous polyurethane oil dispersion are improved, so that the prepared epoxy resin modified aqueous polyurethane oil dispersion can be widely used for metal protective coatings.
Detailed Description
In the description of the present invention, "solution" generally refers to an aqueous solution unless otherwise specified.
In the description of the present invention, "plural" means two or more.
In the description of the present invention, the epoxy resin includes, but is not limited to, E-20 epoxy resin, E-44 epoxy resin, and E-51 epoxy resin.
In the description of the present invention, the dry vegetable oil acid includes, but is not limited to, one or more of linoleic acid, soya oil acid, eleostearic acid, dehydrated ricinoleic acid, abietic acid, and cottonseed oil acid.
In the present description, alcoholysis catalysts include, but are not limited to, one or more of N, N-dimethylaniline, triethylamine, triethanolamine, and diethanolamine.
In the description of the present invention, the polyol includes, but is not limited to, one or more of glycerol, pentaerythritol, dipentaerythritol, neopentyl glycol, diethylene glycol, ethylene glycol, trimethylolpropane, trimethylolethane, and polyether polyols.
In the present description, hydrophilic monomers include, but are not limited to, one or more of dimethylolpropionic acid, dimethylolbutyric acid, dimethylolvaleric acid, and dimethylolnonanoic acid.
In the description of the present invention, the diisocyanate compound includes, but is not limited to, one or more of toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, trimethylhexamethylene diisocyanate, dicyclohexylmethane diisocyanate, xylylene diisocyanate, tetramethylxylylene diisocyanate, and hexahydrotolylene diisocyanate.
In the description of the present invention, the neutralizing agent includes, but is not limited to, one or more of N, N-dimethylethanolamine, 2-amino-2-methyl-1-propanol, ammonia, triethylamine, triethanolamine, diethylamine, and diethanolamine.
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The experimental procedures, for which specific conditions are not indicated in the following examples, are generally carried out under conventional conditions, or under conditions recommended by the manufacturer. Percentages are by weight unless otherwise indicated.
The numbers of "parts" of the raw materials charged in the following examples are "parts by weight"
The properties of the epoxy resin modified aqueous urethane oil dispersions in the following examples were measured as follows:
drying speed: GB/T1728-79 touch method (temperature 23 +/-2 ℃/humidity 50 +/-5%)
Salt spray resistance: GB-T10125-1997 Artificial atmosphere Corrosion test, salt spray test
Acid and alkali resistance: GB9274-88 determination of liquid-resistant media for paints and varnishes.
Example 1
Putting 300 parts of E-51 epoxy resin (manufacturer: ba ling petrochemical), 400 parts of linoleic acid and 0.6 part of N, N-dimethylaniline into a reaction kettle, introducing nitrogen until the pressure is 0.06mpa, heating to 150-160 ℃ under the stirring state, keeping the temperature for 1 hour, continuously heating to 200-210 ℃ and keeping the temperature until the acid value is less than 1.5 mg of potassium hydroxide/g; cooling to 110-120 ℃ after the acid value is qualified, adding 71 parts of neopentyl glycol and 45 parts of dimethylolpropionic acid, and stirring and dissolving for 30 minutes; vacuumizing, distilling under reduced pressure, removing all water, and cooling; when the temperature is reduced to 60-70 ℃, then 100 parts of toluene diisocyanate are dripped, and the dripping is finished within 1.5-2.0 hours; after the dropwise addition, the temperature is raised to 85 ℃, and after the reaction is carried out for 0.5 hour at the temperature, the viscosity measurement is started until the viscosity is 23700cps/30 ℃; after the viscosity is qualified, cooling to 40-50 ℃, dripping 27 parts of triethylamine into the reaction kettle, and stirring for 30 minutes; 1914 parts of deionized water is dripped into the reaction kettle under high-speed stirring; after the dropwise addition is finished, stirring is continued for 30 minutes; filtering and packaging to finally obtain the milky epoxy resin modified water-based polyurethane oil dispersion with the pH value of 7.5-8.0 and the solid content of 33 percent (weight).
The drying speed, the salt spray resistance and the acid and alkali resistance of the epoxy resin modified water-based polyurethane oil dispersion are measured according to the method, and the performances are as follows:
1. drying speed: drying for 8min, and drying for 3 hr;
2. salt spray resistance: 250 hr;
3. acid and alkali resistance: 5% sodium hydroxide solution for 120hr, and 5% hydrochloric acid solution for 100 hr.
Example 2
342 parts of E-44 epoxy resin (manufacturer: ba ling petrochemical), 400 parts of linoleic acid and 0.8 part of triethylamine are put into a reaction kettle, nitrogen is introduced until the pressure is 0.055mpa, the temperature is raised to 150-160 ℃ under the stirring state, the temperature is kept for 1 hour, the temperature is raised to 200-210 ℃ and the temperature is kept until the acid value is less than 1.5 mg of potassium hydroxide/g; cooling to 110-120 ℃ after the acid value is qualified, adding 71 parts of neopentyl glycol and 60 parts of dimethylolbutyric acid, and stirring for dissolving for 30 minutes; vacuumizing, distilling under reduced pressure, removing all water, and cooling; when the temperature is reduced to 60-70 ℃, then 70 parts of isophorone diisocyanate are dripped, and the dripping is finished within 1.5-2.0 hours; after the dropwise addition is finished, the temperature is raised to 85 ℃, and after the reaction is carried out for 0.5 hour at the temperature, the viscosity measurement is started until the viscosity is 25500cps/30 ℃; after the viscosity is qualified, cooling to 40-50 ℃, adding 36 parts of triethanolamine into the reaction kettle, and stirring for 30 minutes; 1741 parts of deionized water is added into the reaction kettle dropwise under high-speed stirring; after the dropwise addition is finished, stirring is continued for 30 minutes; filtering and packaging to finally obtain the yellowish semitransparent epoxy resin modified water-based polyurethane oil dispersion with the pH value of 7.5-8.0 and the solid content of 36 percent (by weight).
The drying speed, the salt spray resistance and the acid and alkali resistance of the epoxy resin modified water-based polyurethane oil dispersion are measured according to the method, and the performances are as follows:
1. drying speed: drying for 9min, and drying for 2.5 hr;
2. salt spray resistance: 270 hr;
3. acid and alkali resistance: 5% sodium hydroxide solution for 130hr, and 5% hydrochloric acid solution for 110 hr.
Example 3
Putting 200 parts of E-20 epoxy resin (manufacturer: bailing petrochemical), 100 parts of E-51 epoxy resin (manufacturer: bailing petrochemical), 400 parts of dehydrated ricinoleic acid and 0.7 part of diethanol amine into a reaction kettle, introducing nitrogen until the pressure is 0.065mpa, heating to 150-160 ℃ under a stirring state, keeping the temperature for 1 hour, and continuously heating to 200-210 ℃ until the acid value is less than 1.5 mg of potassium hydroxide/g; cooling to 110-120 ℃ after the acid value is qualified, adding 80 parts of diethylene glycol and 50 parts of dimethylolpropionic acid, and stirring for dissolving for 30 minutes; vacuumizing, distilling under reduced pressure, removing all water, and cooling; when the temperature is reduced to 60-70 ℃, then 140 parts of diphenylmethane diisocyanate are dripped, and the dripping is finished within 1.5-2.0 hours; after the dropwise addition is finished, the temperature is raised to 75 ℃, and after the reaction is carried out for 0.5 hour at the temperature, the viscosity measurement is started until the viscosity is 26200cps/30 ℃; after the viscosity is qualified, cooling to 40-50 ℃, dripping 30 parts of triethylamine into the reaction kettle, and stirring for 30 minutes; dropping 1857 parts of deionized water into the reaction kettle under high-speed stirring; after the dropwise addition is finished, stirring is continued for 30 minutes; filtering and packaging to finally obtain the milky epoxy resin modified water-based polyurethane oil dispersion with the pH value of 8.0-8.5 and the solid content of 35 percent (weight).
The drying speed, the salt spray resistance and the acid and alkali resistance of the epoxy resin modified water-based polyurethane oil dispersion are measured according to the method, and the performances are as follows:
1. drying speed: drying for 10min, and drying for 3 hr;
2. salt spray resistance: 265 hr;
3. acid and alkali resistance: 5% sodium hydroxide solution 115hr, 5% hydrochloric acid solution 105 hr.
Example 4
Putting 200 parts of E-20 epoxy resin (manufacturer: bailing petrochemical), 100 parts of E-51 epoxy resin (manufacturer: bailing petrochemical), 400 parts of eleostearic acid and 0.7 part of diethanolamine into a reaction kettle, introducing nitrogen until the pressure is 0.07mpa, heating to 150-160 ℃ under a stirring state, keeping the temperature for 1 hour, and continuing heating to 200-210 ℃ until the acid value is less than 1.5 mg of potassium hydroxide/g; cooling to 110-120 ℃ after the acid value is qualified, adding 150 parts of difunctional polyether PPG (manufacturer: Shandong Lanxingdong Co., Ltd.) with the molecular weight of 1000 and 60 parts of dimethylolpropionic acid, and stirring and dissolving for 30 minutes; vacuumizing, distilling under reduced pressure, removing all water, and cooling; when the temperature is reduced to 60-70 ℃, then 100 parts of hexahydrotoluene diisocyanate are dripped, and the dripping is finished within 1.5-2.0 hours; after the dropwise addition is finished, the temperature is raised to 85 ℃, and after the reaction is carried out for 0.5 hour at the temperature, the viscosity is measured till the viscosity is 27500cps/30 ℃; after the viscosity is qualified, cooling to 40-50 ℃, dripping 42 parts of triethylamine into the reaction kettle, and stirring for 30 minutes; beginning to dropwise add 1953 parts of deionized water into the reaction kettle under high-speed stirring; after the dropwise addition is finished, stirring is continued for 30 minutes; filtering and packaging to finally obtain the yellow semitransparent epoxy resin modified water-based polyurethane oil dispersion with the pH value of 8.0-8.5 and the solid content of 35 percent (weight).
The drying speed, the salt spray resistance and the acid and alkali resistance of the epoxy resin modified water-based polyurethane oil dispersion are measured according to the method, and the performances are as follows:
1. drying speed: drying for 7min, and drying for 2.6 hr;
2. salt spray resistance: 280 hr;
3. acid and alkali resistance: 5% sodium hydroxide solution 126hr, 5% hydrochloric acid solution 108 hr.
Comparative example 1
A commercially available aqueous polyurethane oil dispersion comprising the components: TDI, polyether polyol, linseed oil, neopentyl glycol, DMPA, triethylamine and water.
The applicant determines the drying speed, the salt spray resistance and the acid and alkali resistance according to the determination method, and the properties are as follows:
1. drying speed: drying for 20min, and drying for 5 hr;
2. salt spray resistance: 105 hr;
3. acid and alkali resistance: 5% sodium hydroxide solution 69hr, and 5% hydrochloric acid solution 80 hr.
By comparing the data of the drying speed, the salt spray resistance and the acid and alkali resistance of the commercially available aqueous polyurethane oil dispersion with the data of the examples 1 to 4 of the present invention, it can be seen that the epoxy resin modified aqueous polyurethane oil dispersion of the present invention has great advantages in drying speed, salt spray resistance and acid and alkali resistance.
The above embodiments are merely preferred embodiments of the present invention, which are not intended to limit the scope of the present invention, and various changes may be made in the above embodiments of the present invention. All simple and equivalent changes and modifications made according to the claims and the content of the specification of the present application fall within the scope of the claims of the present patent application. The invention has not been described in detail in order to avoid obscuring the invention.
Claims (10)
1. The epoxy resin modified aqueous polyurethane oil dispersion is characterized in that raw materials for preparing the epoxy resin modified aqueous polyurethane oil dispersion comprise the following components in parts by weight:
2. the epoxy-modified aqueous urethane oil dispersion according to claim 1, wherein the epoxy resin is selected from one or more of E-20 epoxy resin, E-44 epoxy resin and E-51 epoxy resin.
3. The epoxy-modified aqueous urethane oil dispersion according to claim 1, wherein the dry vegetable oleic acid is selected from one or more of linoleic acid, soy oleic acid, eleostearic acid, dehydrated ricinoleic acid, abietic acid, and cottonseed oleic acid.
4. The epoxy modified aqueous urethane oil dispersion according to claim 1, wherein the alcoholysis catalyst is selected from one or more of the group consisting of N, N-dimethylaniline, triethylamine, triethanolamine and diethanolamine.
5. The epoxy modified aqueous urethane oil dispersion according to claim 1, wherein the polyol is selected from one or more of glycerol, pentaerythritol, dipentaerythritol, neopentyl glycol, diethylene glycol, ethylene glycol, trimethylolpropane, trimethylolethane and polyether polyols.
6. The epoxy modified aqueous urethane oil dispersion according to claim 1, wherein the hydrophilic monomer is selected from one or more of dimethylolpropionic acid, dimethylolbutyric acid, dimethylolvaleric acid and dimethylolnonanoic acid.
7. The epoxy-modified aqueous urethane oil dispersion according to claim 1, wherein the diisocyanate compound is selected from one or more of toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, trimethylhexamethylene diisocyanate, dicyclohexylmethane diisocyanate, xylylene diisocyanate, tetramethylxylylene diisocyanate, and hexahydrotoluene diisocyanate.
8. The epoxy modified aqueous urethane oil dispersion according to claim 1, wherein the neutralizing agent is selected from one or more of N, N-dimethylethanolamine, 2-amino-2-methyl-1-propanol, ammonia, triethylamine, triethanolamine, diethylamine and diethanolamine.
9. A process for the preparation of an epoxy resin modified aqueous urethane oil dispersion according to any one of claims 1 to 7, characterized in that it comprises the steps of:
(1) putting epoxy resin, 13-18 parts by weight of dry vegetable oleic acid and 0.1-0.5 part by weight of alcoholysis catalyst into a reaction kettle, introducing nitrogen until the pressure is 0.05-0.1 mpa, heating to 150-160 ℃ under a stirring state, keeping the temperature for 1 hour, continuously heating to 200-210 ℃ and keeping the temperature until the acid value is less than 1.5 mg of potassium hydroxide/g;
(2) after the acid value is qualified, cooling the reaction system to 110-120 ℃, adding 5-8 parts by weight of polyhydric alcohol and 4-8 parts by weight of hydrophilic monomer, and stirring for dissolving for 20-40 minutes;
(3) distilling under reduced pressure, removing all water, cooling to 60-70 ℃, then dropwise adding 4-8 parts by weight of diisocyanate compound, and finishing dropping within 1.5-2.0 hours; after the dropwise addition is finished, heating to 75-85 ℃, and reacting for 0.5-0.6 hour at the temperature until the viscosity of the reaction system is 20000 cps/30-30000 cps/30 ℃;
(4) after the viscosity is qualified, cooling the reaction system to 40-50 ℃, putting 1-2 parts by weight of neutralizing agent into the reaction kettle, stirring for 20-40 minutes, and then dropwise adding 60-65 parts by weight of deionized water into the reaction system; and after the dropwise addition is finished, continuously stirring for 20-40 minutes to obtain the epoxy resin modified water-based polyurethane oil dispersion.
10. Use of the epoxy resin-modified aqueous urethane oil dispersion according to any one of claims 1 to 8 or prepared by the preparation process according to claim 9 for metal barrier coatings.
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| CN115259694A (en) * | 2022-08-12 | 2022-11-01 | 成都理工大学 | Epoxy resin enhanced basalt fiber impregnating compound and preparation method thereof |
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Application publication date: 20200904 Assignee: Zhejiang Yiwei New Material Technology Co.,Ltd. Assignor: YUNYAN MATERIAL TECHNOLOGY (SHANGHAI) CO.,LTD. Contract record no.: X2023310000034 Denomination of invention: An epoxy resin modified waterborne urethane oil dispersion and its preparation method and use Granted publication date: 20220617 License type: Common License Record date: 20230317 |