CN114163612A - Closed polyisocyanate composition and preparation method and application thereof - Google Patents
Closed polyisocyanate composition and preparation method and application thereof Download PDFInfo
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- CN114163612A CN114163612A CN202111390756.8A CN202111390756A CN114163612A CN 114163612 A CN114163612 A CN 114163612A CN 202111390756 A CN202111390756 A CN 202111390756A CN 114163612 A CN114163612 A CN 114163612A
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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
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/80—Masked polyisocyanates
- C08G18/8061—Masked polyisocyanates masked with compounds having only one group containing active hydrogen
- C08G18/807—Masked polyisocyanates masked with compounds having only one group containing active hydrogen with nitrogen containing compounds
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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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Abstract
The invention relates to a blocked isocyanate composition which is prepared by reacting raw materials containing polyisocyanate and a blocking agent, wherein the main blocking agent is 3, 5-dimethylpyrazole; the composition contains aromatic hydrocarbon solvent, and the content of pseudocumene in the aromatic hydrocarbon solvent is 40-50%. The invention also provides a preparation method of the composition, and the composition has good appearance when being used for the single-component coating.
Description
Technical Field
The invention belongs to the field of isocyanate, and particularly relates to a closed polyisocyanate composition and a preparation method thereof.
Background
The blocked isocyanate is generated by the reaction of isocyanate and a blocking agent, the chemical bond formed by the blocking agent and an isocyanate group is relatively weak, and free isocyanate groups can be released under certain conditions, so that the blocked isocyanate is widely used in single-component polyurethane coatings and adhesives, and is particularly suitable for automobile coatings and coil coatings.
The blocking agents for the isocyanate group are various, and currently, the commonly used blocking agents include phenols, alcohols, oximes, β -dicarbonyl compounds, pyrazoles, amides, and the like. Patent US4976837 describes pyrazole compounds as blocking agents, which can reduce the deblocking temperature of blocked isocyanates to some extent; 3, 5-dimethylpyrazole serving as an isocyanate blocking agent can effectively reduce the deblocking temperature of blocked isocyanate and reduce the energy consumption in the high-temperature baking process.
The high boiling point aromatic solvent oil has the characteristics of strong dissolving power, low toxicity, high boiling point, slow volatilization and the like, and is commonly used for producing closed isocyanate. However, in the preparation of 3, 5-dimethylpyrazole-blocked isocyanate compositions, sometimes discernible irregularities appear in the paint film appearance, so that the appearance of the paint film is markedly reduced.
The object of the present invention was to prepare blocked isocyanate compositions which, when used in one-component coatings, give a distinctly improved appearance of the paint film.
Disclosure of Invention
The invention aims to provide a blocked isocyanate composition capable of obviously improving the appearance of a paint film and a preparation method thereof. Aiming at the problems existing in the application of the existing 3, 5-dimethylpyrazole blocked isocyanate product, the appearance performance of a paint film can be obviously improved.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a blocked isocyanate composition is prepared by reacting polyisocyanate with a blocking agent,
(1) the blocking agent comprises 3, 5-dimethylpyrazole;
(2) the product contains aromatic solvent oil, and the content of the pseudocumene in the aromatic solvent oil is 40-50%.
A method for preparing blocked polyisocyanate composition, said method comprises polyisocyanate and 3, 5-dimethylpyrazole, react in the system comprising aromatic hydrocarbon solvent, prepare and get the blocked polyisocyanate composition; controlling the content of the pseudocumene in the aromatic hydrocarbon solvent to be 40-50%. The pseudocumene content in the aromatic hydrocarbon solvent was below 40% or above 50%, and we found that the appearance of the paint film was relatively poor, presumably due to the difference in solvent dissolving capacity and solvent evaporation gradient.
In the present invention, the aromatic hydrocarbon solvent oil generally refers to high boiling point aromatic hydrocarbon solvent oil, and the boiling point range is 130-250 ℃. The inventor conducts experimental research on the flatness of the appearance of a paint film by using a 3, 5-dimethylpyrazole blocked polyisocyanate product as a curing agent, finds that the control of the content of the pseudocumene in a high-boiling-point aromatic hydrocarbon solvent is another direction for improving the appearance problem of the paint film, and accordingly provides a practical industrial scheme.
The high boiling point aromatic solvent oil mainly contains carbon nonaarene and carbon decaarene, and the components of aromatic solvent oil products produced by different manufacturers on the market have certain difference; the No. 100 aromatic solvent oil is widely applied to closed isocyanate products, and the content of the pseudocumene is generally between 20 and 35 percent. Different components in the aromatic solvent oil have different dissolvability to the coating and volatilization speed in the film forming process, and finally have certain influence on the appearance of the paint film. Based on the difference, the inventor conducts experimental research on the components of the high-boiling-point solvent, and finds that the appearance of a paint film can be effectively improved by controlling the content of the pseudocumene in the high-boiling-point aromatic solvent.
In the invention, the content of the pseudocumene in the high-boiling-point aromatic solvent can be obtained by distilling No. 100 aromatic solvent oil or adjusting the content by adding the pseudocumene. The distillation treatment temperature of the aromatic solvent oil is 40-70 ℃, and the pressure is 50-500 Pa.
In the invention, the mass ratio of the high boiling point aromatic hydrocarbon solvent oil in the closed isocyanate composition is 10-40%.
In the invention, isocyanate reacts with the blocking agent, the blocking reaction can be carried out under the condition of solvent or no solvent, the reaction is mainly determined according to the viscosity of the product, and the solvent is added before the reaction to reduce the viscosity of the system in the reaction process.
In the present invention, the solvent in the blocked isocyanate composition may be added, in addition to the aromatic solvent oil, other conventional paint solvents which do not react with isocyanate, such as ethyl acetate, butyl acetate, propylene glycol methyl ether acetate, n-butyl 3-methoxyacetate, acetone, methyl ethyl ketone, 4-methyl-2-pentanone, cyclohexanone, toluene, xylene, etc. The amount of solvent added is 10-60% of the mass of the blocked isocyanate composition.
In the present invention, the isocyanate is reacted with the blocking agent at a temperature of 30 to 120 ℃ and preferably 40 to 80 ℃.
In the process of the present invention, suitable polyisocyanates are based on diisocyanates and are prepared by processes such as self-polymerization, reaction with polyols and the like, comprising one or more of isocyanurate, uretdione, biuret, urethane, allophanate, iminooxadiazinedione, carbodiimide structures, preferably isocyanurate and biuret structures.
The diisocyanate is one or more of aliphatic and/or cycloaliphatic diisocyanates containing 4 to 30 carbon atoms in addition to NCO groups in the carbon backbone. Preferably one or more selected from the group consisting of 1, 4-butane diisocyanate, 1, 5-pentane diisocyanate, 2, 4-trimethyl-hexamethylene-1, 6-diisocyanate, lysine diisocyanate, isophorone diisocyanate, 1, 3-bis (isocyanatomethyl) cyclohexane and 4, 4' -dicyclohexylmethane diisocyanate, more preferably 1, 6-Hexamethylene Diisocyanate (HDI).
The polyisocyanates have an NCO functionality of 2.5 or more, usually 10 or less, and an isocyanate content of 5 to 40% by weight (calculated on the basis of the absence of solvent).
In the present invention, the polyol reacted with diisocyanate to prepare polyisocyanate may be glycerol, trimethylolpropane, pentaerythritol, polyester polyols, polyether polyols, acrylic polyols, polyolefin polyols, etc.
In the invention, 60-100% (mol ratio) of isocyanate groups are blocked by 3, 5-dimethylpyrazole, and 0-40% (mol ratio) of isocyanate groups are blocked by other blocking agents. Other useful blocking agents are alcohols, oximes, lactams, beta-dicarbonyl compounds, and the like. The alcohol compound can be one or more selected from methanol, ethanol, 2-propanol, n-butanol, sec-butanol, 2-ethyl-1-hexanol, 2-methoxyethanol, 2-ethoxyethanol and 2-butoxyethanol; the lactam compound can be one or more selected from epsilon-caprolactam, delta-valerolactam and gamma-butyrolactam; the beta-dicarbonyl compound may be selected from one or more of dimethyl malonate, diethyl malonate, ethyl acetoacetate, methyl acetoacetate, di-n-propyl malonate, diisopropyl malonate, di-n-butyl malonate and diisobutyl malonate; the oxime compound is selected from one or more of butanone oxime, acetone oxime, formaldehyde oxime, acetaldehyde oxime and cyclohexanone oxime.
The blocking agent is used in an amount of 0.95 to 1.1 equivalents, preferably 0.99 to 1.05 equivalents, relative to the isocyanate groups of the polyisocyanate.
In the method, antioxidants such as hindered phenols, hindered amines, phosphites and the like can be added to improve the storage stability of the product.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
(1) the obtained blocked isocyanate composition has good appearance performance when being used for single-component coating after being formed into a film.
(2) The control process of the content of the pseudocumene in the high-boiling-point aromatic solvent oil is simple and easy to realize industrialization.
Detailed Description
The process according to the invention will be further illustrated by the following examples, but the invention is not limited to the examples listed but also encompasses any other known modification within the scope of the claims of the invention.
The main raw material sources are as follows:
polyisocyanate, Wannate HT-100, wanwawa chemistry;
polyisocyanate, Wannate HB-100, wanhua chemistry;
aromatic solvent oil No. 100, chemical Limited of Hualun Jiangsu;
pseudocumene, chemical limited of hualun, Jiangsu;
3, 5-dimethylpyrazole, wacker chemical;
butanone oxime, new materials in the blue sky, Hubei, Inc.;
propylene glycol methyl ether acetate, chemical Limited Jiangsu Hualun.
The following test methods were used in the examples of the invention:
(1) the content of pseudocumene in the aromatic hydrocarbon solvent was measured by gas chromatography.
The test method comprises the following steps: agilent 7890B gas chromatograph; a FID detector; chromatography column Agilent HP-FFAP (50 m.times.320. mu.m.times.0.5 μm); sample inlet temperature: 250 ℃; temperature programming: keeping at 80 deg.C for 8 min; then heating to 100 ℃ at a speed of 20 ℃/min, and keeping for 10 min; heating to 170 deg.C at 35 deg.C/min, and maintaining for 10 min; FID detector temperature: at 300 ℃. The retention time of the pseudocumene is about 13.5min, and the pseudocumene content is calculated according to an area normalization method.
(2) The appearance of the paint film is as follows: the cured films were tested by BYK orange peel tester Wavescan-DOI to test the LW value of the films.
Example 1
Taking Wanhua chemical HDI tripolymer as raw material (
HT-100, NCO content 22.0%). 100g of HT-100, 34g of aromatic hydrocarbon solvent oil (No. 100 aromatic hydrocarbon solvent oil is subjected to reduced pressure distillation at 50 ℃/150Pa, the content of the pseudocumene is 45 percent and is determined according to the gas chromatography), 16g of propylene glycol methyl ether acetate are added into a reaction kettle, nitrogen is used for protection, the mixture is uniformly mixed, then 50.5g of 3, 5-dimethylpyrazole is added in batches, and the reaction temperature is controlled to be 40-60 ℃. And detecting the reaction process by infrared spectroscopy, stopping the reaction when free NCO groups cannot be detected by infrared spectroscopy, and obtaining the blocked isocyanate composition.
Example 2
Using Wanhua chemical HDI biuret as raw material (
HB-100, NCO content 22.0%). 100g of HB-100 and 50g of aromatic hydrocarbon solvent oil (100 # aromatic hydrocarbon solvent oil is added with pseudocumene for mixing, the pseudocumene content is 50%, and the above-mentioned gas chromatography is defined) are added into a reaction kettle, and uniformly mixed under the protection of nitrogen gas, then 50.5g of 3, 5-dimethylpyrazole are added in batches, and the reaction temperature is controlled at 40-60 deg.C. And detecting the reaction process by infrared spectroscopy, stopping the reaction when free NCO groups cannot be detected by infrared spectroscopy, and obtaining the blocked isocyanate composition.
Example 3
Taking Wanhua chemical HDI tripolymer as raw material (
HT-100, NCO content 22.0%). 100g of HT-100, 50g of aromatic hydrocarbon solvent oil (No. 100 aromatic hydrocarbon solvent oil is subjected to reduced pressure distillation at 50 ℃/100Pa, the content of the pseudocumene is 40 percent, which is determined according to the gas chromatography), nitrogen protection and uniform mixing are carried out, then 9.2g of butanone oxime and 40.4g of 3, 5-dimethylpyrazole are sequentially added, and the reaction temperature is controlled to be 40-60 ℃. And detecting the reaction process by infrared spectroscopy, stopping the reaction when free NCO groups cannot be detected by infrared spectroscopy, and obtaining the blocked isocyanate composition.
Example 4
Taking Wanhua chemical HDI tripolymer as raw material (
HT-100, NCO content 22.0%). 100g of HT-100, 34g of aromatic hydrocarbon solvent oil (No. 100 aromatic hydrocarbon solvent oil is subjected to reduced pressure distillation at 50 ℃/150Pa, the content of the pseudocumene is 45 percent and is determined according to the gas chromatography), 16g of propylene glycol methyl ether acetate are added into a reaction kettle, nitrogen is used for protection, the mixture is uniformly mixed, then 55.3g of 3, 5-dimethylpyrazole is added in batches, and the reaction temperature is controlled to be 40-60 ℃. And detecting the reaction process by infrared spectroscopy, stopping the reaction when free NCO groups cannot be detected by infrared spectroscopy, and obtaining the blocked isocyanate composition.
Example 5
Taking Wanhua chemical HDI tripolymer as raw material (
HT-100, NCO content 22.0%). 100g of HT-100, 34g of aromatic hydrocarbon solvent oil (No. 100 aromatic hydrocarbon solvent oil is subjected to reduced pressure distillation at 50 ℃/150Pa, the content of pseudocumene is 45 percent and is determined according to the gas chromatography), 16g of propylene glycol methyl ether acetate is added into a reaction kettle, nitrogen is used for protection, the mixture is uniformly mixed, 47.9g of 3, 5-dimethylpyrazole is added in batches, the reaction temperature is controlled to be 40-60 ℃, and the reaction is stopped after 5 hours of reaction, so that the closed isocyanate composition is obtained.
Comparative example 1
Taking Wanhua chemical HDI tripolymer as raw material (
HT-100, NCO content 22.0%). 100g of HT-100, 34g of aromatic solvent oil (No. 100 aromatic solvent oil, 30 percent of pseudocumene content, determined according to the gas chromatography) and 16g of propylene glycol monomethyl ether acetate are added into a reaction kettle, are uniformly mixed under the protection of nitrogen, and then 50.5g of 3, 5-dimethylpyrazole is added in batches, and the reaction temperature is controlled at 40-60 ℃. And detecting the reaction process by infrared spectroscopy, stopping the reaction when free NCO groups cannot be detected by infrared spectroscopy, and obtaining the blocked isocyanate composition.
Comparative example 2
Taking Wanhua chemical HDI tripolymer as raw material (
HB-100, NCO content 22.0%). 100g of HT-100 and 50g of aromatic hydrocarbon solvent oil (100 # aromatic hydrocarbon solvent oil is added with pseudocumene for mixing, the pseudocumene content is 35 percent and is determined according to the gas chromatography) are added into a reaction kettle, the mixture is uniformly mixed under the protection of nitrogen, then 50.5g of 3, 5-dimethylpyrazole is added in batches, and the reaction temperature is controlled to be 40-60 ℃. And detecting the reaction process by infrared spectroscopy, stopping the reaction when free NCO groups cannot be detected by infrared spectroscopy, and obtaining the blocked isocyanate composition.
Comparative example 3
Taking Wanhua chemical HDI tripolymer as raw material (
HT-100, NCO content 22.0%). 100g of HT-100, 50g of aromatic hydrocarbon solvent oil (100 # aromatic hydrocarbon solvent oil is added with pseudocumene, the pseudocumene content is 60 percent, determined according to the gas chromatography), under the protection of nitrogen, the mixture is uniformly mixed, then 9.2g of butanone oxime and 40.4g of 3, 5-dimethylpyrazole are sequentially added, and the reaction temperature is controlled to be 40-60 ℃. And detecting the reaction process by infrared spectroscopy, stopping the reaction when free NCO groups cannot be detected by infrared spectroscopy, and obtaining the blocked isocyanate composition.
Example 6
A varnish was prepared on the basis of the blocked polyisocyanate prepared in examples 1 to 3 and comparative examples 1 to 3 and the polyacrylic polyol (Coder resin AC1370-a), NCO/OH ═ 1.05, and the solids content was 50% (the dilution solvent was butyl acetate), and 0.5% (calculated as the varnish solids content) of dibutyltin dilaurate was added to the coating.
The varnish prepared was sprayed on clean tin plate, baked at 140 ℃ for 30min to give a paint film of 30-40 μm, and then the Lw value of the paint film was tested. The test results are given in the table below.
TABLE 1 paint film appearance testing
As can be seen from the above table, the paint films prepared by using the blocked isocyanates prepared in examples 1 to 5 as raw materials are tested by an orange peel tester, and the Lw value of the paint film is obviously lower than that of the paint films prepared in comparative examples 1 to 3; the blocked isocyanates prepared in examples 1 to 5 gave paint films starting from the starting materials which had a significantly better appearance than the paint films prepared in comparative examples 1 to 3. The blocked polyisocyanates prepared according to the invention therefore have a better paint film appearance.
Claims (10)
1. A blocked isocyanate composition prepared by reacting reaction raw materials comprising a polyisocyanate and a blocking agent, characterized in that:
(1) the blocking agent comprises 3, 5-dimethylpyrazole;
(2) the product contains aromatic solvent oil, and the content of the pseudocumene in the aromatic solvent oil is 40-50%.
2. A blocked polyisocyanate composition according to claim 1, wherein the blocked isocyanate composition has an aromatic mineral spirit content of 10 to 40%.
3. Blocked polyisocyanate composition according to claim 1 or 2, characterized in that 3, 5-dimethylpyrazole is the main blocking agent and 60-100% of the isocyanate groups are reacted with 3, 5-dimethylpyrazole.
4. The blocked polyisocyanate composition according to any one of claims 1 to 3, wherein the content of pseudocumene in the aromatic hydrocarbon solvent oil is controlled by adding pseudocumene to the aromatic hydrocarbon solvent or by distillation under reduced pressure.
5. The process for producing a blocked polyisocyanate composition according to any one of claims 1 to 4, wherein a blocked polyisocyanate composition is produced by reacting a polyisocyanate with a blocking agent comprising 3, 5-dimethylpyrazole in a system containing an aromatic solvent oil; controlling the content of the pseudocumene in the aromatic hydrocarbon solvent oil to be 40-50%.
6. A process according to claim 5, characterised in that the blocking agent is reacted with the isocyanate at a temperature of 30 to 120 ℃, preferably 40 to 80 ℃.
7. The process of claim 5 or 6, wherein the polyisocyanate is derived from one or more of aliphatic and/or cycloaliphatic diisocyanates by self-polymerization or reaction with a polyol, preferably wherein the polyisocyanate contains one or more of isocyanurate groups, uretdione groups, biuret groups, urethane groups, allophanate groups, iminooxadiazinedione groups and carbodiimide groups; preferably, the polyisocyanate has an NCO functionality of 2.5 to 10 and an isocyanate content of 5 to 40% by weight.
8. The process according to claim 7, characterized in that the diisocyanate is one or more of aliphatic and/or cycloaliphatic diisocyanates containing from 4 to 30 carbon atoms in the carbon skeleton in addition to the NCO groups; one or more of 1, 4-butane diisocyanate, 1, 5-pentane diisocyanate, 2, 4-trimethyl-hexamethylene-1, 6-diisocyanate, lysine diisocyanate, isophorone diisocyanate, 1, 3-bis (isocyanatomethyl) cyclohexane and 4, 4' -dicyclohexylmethane diisocyanate are preferred, and 1, 6-hexamethylene diisocyanate is more preferred.
9. A process according to any one of claims 4 to 8, characterised in that the blocking agent is used in an amount of 0.95 to 1.1 equivalents, preferably 0.99 to 1.05 equivalents, relative to the isocyanate groups of the polyisocyanate.
10. Use of a blocked isocyanate composition according to any one of claims 1 to 4 or obtained by a process according to any one of claims 5 to 9 in one-component polyurethane coatings or adhesives; preferably, the one-component polyurethane coating is an automobile coating or a coil coating.
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