CN115572528B

CN115572528B - Anticorrosive paint for furniture and preparation method and application thereof

Info

Publication number: CN115572528B
Application number: CN202211424569.1A
Authority: CN
Inventors: 程军峰; 彭鹏鸿
Original assignee: Foshan Gaoming Shoubang Chemical Co ltd
Current assignee: Foshan Gaoming Shoubang Chemical Co ltd
Priority date: 2022-11-15
Filing date: 2022-11-15
Publication date: 2023-06-20
Anticipated expiration: 2042-11-15
Also published as: CN115572528A

Abstract

The invention provides an anticorrosive paint for furniture, a preparation method and application thereof, wherein the anticorrosive paint for furniture comprises silicone oil modified polyurethane epoxy resin, an antirust agent, a solvent and a curing agent, and the anticorrosive paint has good adhesive force and corrosion resistance by the synergistic effect of the silicone oil modified polyurethane epoxy resin and the antirust agent and the preparation of the antirust agent by adopting neodymium iron boron and polytetrafluoroethylene powder. The anticorrosive paint for furniture can be used for replacing the existing anticorrosive paint to solve the problems of poor adhesive force and insufficient corrosion resistance time of the existing anticorrosive paint for furniture.

Description

Anticorrosive paint for furniture and preparation method and application thereof

Technical Field

The invention belongs to the technical field of coatings, and particularly relates to an anti-corrosion coating for furniture, and a preparation method and application thereof.

Background

With the development of industry and economy, the metal material is widely applied to living aspects as a structural material or a functional material, but the metal is easy to be corroded and damaged in a long-term use environment, the service life of the metal material is influenced, and great loss is brought to economy. The economic loss caused by metal corrosion is remarkable, and the direct economic loss caused by metal corrosion is about 7000 hundred million dollars worldwide, and the economic loss caused by metal corrosion in China is about 4% of the total national production value. Metal parts in furniture articles also face corrosion conditions in long-term use environments, affecting the service life of furniture, and therefore, corrosion protection of furniture is critical.

The use of organic coatings in the field of corrosion protection of metallic materials is currently the most economical, most effective and most commonly used method of corrosion protection of metals. Based on the fact that different resins have different material characteristics, people prepare coatings with different functions by using different resins, and prepare composite coatings by using the coatings with different functions so as to meet the use requirements of metal protection. However, the existing organic paint has the problems of weak adhesion to the metal surface, easy occurrence of coating falling off, crevice corrosion under the coating, filiform corrosion and other damages, and the sudden corrosion accident is induced.

Therefore, in order to solve the above problems, it is needed to find an anti-corrosion paint for furniture with strong adhesion and good weather resistance, so as to ensure the stable performance of the metal material in the furniture in a long-term use environment.

Disclosure of Invention

Aiming at the defects existing in the prior art, the invention aims to provide the anti-corrosion coating for furniture and the preparation method thereof, and aims to solve the technical problem that the existing anti-corrosion coating cannot meet the corrosion resistance and stability of furniture in a long-term use environment.

In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:

the anticorrosive paint for furniture comprises the following components in percentage by mass:

30 to 55 percent of silicone oil modified polyurethane epoxy resin

Rust inhibitor 5-10%

15 to 40 percent of solvent

1% -20% of curing agent.

The silicone oil modified polyurethane epoxy resin is prepared from hydroxyalkyl silicone oil, diisocyanate and epoxypropanol in the presence of a catalyst.

The hydroxyalkyl silicone oil is selected from one or more of the following substances: hydroxyethyl silicone oil, hydroxymethyl silicone oil, hydroxypropyl silicone oil, hydroxybutyl silicone oil.

The diisocyanate is selected from one or more of the following: isophorone diisocyanate (IPDI), naphthalene 1, 5-diisocyanate (NDI), methylene dicyclohexyl isocyanate, methylene diphenyl diisocyanate (MDI), toluene Diisocyanate (TDI), hexamethylene Diisocyanate (HDI), xylylene diisocyanate, hydrogenated xylylene diisocyanate, tetramethylxylylene diisocyanate, p-phenylene diisocyanate, 3' -dimethyldiphenyl-4, 4' -diisocyanate (DDDI), 2, 4-trimethylhexamethylene diisocyanate (TMDI), norbornane Diisocyanate (NDI), and 4,4' -dibenzyl diisocyanate (DBDI) and combinations thereof.

The catalyst is selected from dibutyl tin dilaurate and dibutyl tin dioctanoate.

The catalyst is preferably present in an amount of 0.005 to 3.5% by weight, based on the amount of the hydroxyalkyl silicone oil.

The molar ratio of the hydroxyl silicone oil, the diisocyanate and the epoxypropanol is 1:2:1.

The rust inhibitor is prepared by stirring neodymium iron boron powder in a perfluoro isobutyl methyl ether dispersion liquid of polytetrafluoroethylene powder, and the specific method is as follows: adding 100-1000ppm of neodymium iron boron powder into perfluoro isobutyl methyl ether dispersion liquid of polytetrafluoroethylene powder, and stirring for 0.5-1 hour to obtain the product;

the particle size of the neodymium iron boron powder is 3-5 microns; the particle size of the polytetrafluoroethylene powder is 5-8 microns, and the mass concentration of the polytetrafluoroethylene powder in the perfluoro isobutyl methyl ether dispersion liquid of the polytetrafluoroethylene powder is 8%;

the solvent is selected from n-butyl acetate or propylene glycol methyl ether acetate.

The curing agent is selected from one or more of the following substances: ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, diethylaminopropylamine, aliphatic modified amines, aromatic amines, phthalic anhydride, dicyandiamide.

The second object of the invention is to provide a preparation method of the anti-corrosive paint for furniture, which comprises the following steps:

s1, preparing silicone oil modified polyurethane epoxy resin:

adding hydroxyalkyl silicone oil into a container, vacuum dehydrating at 100-130 ℃, reducing the temperature to 70-90 ℃, adding diisocyanate and a catalyst, and reacting for 2-6h at 70-90 ℃; adding epoxy propanol, and reacting for 2-5 hours at 50-80 ℃ to obtain silicone oil modified polyurethane epoxy resin;

and S2, uniformly stirring and mixing the silicone oil modified polyurethane epoxy resin, the antirust agent, the solvent and the curing agent in a container according to the formula to obtain the anticorrosive paint.

A third object of the invention is to provide an application of the anti-corrosive paint for furniture in furniture.

The fourth object of the invention is to provide an application of the anti-corrosion paint for furniture in improving the anti-corrosion property and the adhesion with metal of the furniture paint.

Compared with the prior art, the invention has the following advantages:

(1) The inventor creatively selects the silicone oil modified polyurethane epoxy resin as the matrix resin of the anti-corrosion coating, and the polyurethane epoxy resin part and the silicone oil in the resin have the synergistic effect of improving the overall adhesiveness of the coating.

(2) The inventor creatively adopts a compound system of neodymium iron boron powder and polytetrafluoroethylene powder as an antirust agent, and by the synergistic effect of the neodymium iron boron and the polytetrafluoroethylene powder, the contact between water and metal in the environment is inhibited by utilizing good cohesiveness of the neodymium iron boron and the metal, and the corrosion resistance and adhesiveness of the anticorrosive paint are further improved.

Detailed Description

The raw materials and equipment used in the invention are common raw materials and equipment in the field unless specified otherwise; the methods used in the present invention are conventional in the art unless otherwise specified.

Unless otherwise defined, all terms used in the specification have the same meaning as commonly understood by one of ordinary skill in the art, but are defined in the specification to be used in the event of a conflict.

For a better description of the objects, technical solutions and advantages of the present invention, the present invention will be further described with reference to the following specific examples.

Preparation of silicone oil modified polyurethane epoxy resin:

preparation of silicone oil modified polyurethane epoxy resin Si-PUEP-1:

adding 0.01mol of hydroxypropyl silicone oil into a three-neck flask with a stirrer, a thermometer and a nitrogen-introducing device, vacuum dehydrating at 120 ℃ for 2 hours, reducing the temperature to 80 ℃, adding 0.02mol of mixed solution of isophorone diisocyanate and 0.03-wt% (mass fraction of hydroxypropyl silicone oil) of dibutyltin dilaurate, and reacting at 80 ℃ for 4 hours; then 0.01mol of epoxy propanol is added for reaction for 3 hours at 60 ℃ to obtain the silicone oil modified polyurethane epoxy resin Si-PUEP-1.

Preparation of silicone oil modified polyurethane epoxy acrylate Si-PUEP-2:

adding 0.01mol of hydroxyethyl silicone oil into a three-neck flask provided with a stirrer, a thermometer and a nitrogen-introducing device, vacuum dehydrating at 120 ℃ for 2 hours, reducing the temperature to 80 ℃, adding a mixed solution of 0.02mol of methylene diphenyl diisocyanate and 0.03-wt% (mass fraction of the hydroxyethyl silicone oil) of dibutyltin dilaurate, and reacting at 80 ℃ for 4 hours; and adding 0.01mol of epoxy propanol, and reacting for 3 hours at 60 ℃ to obtain the silicone oil modified polyurethane epoxy acrylate Si-PUEP-2.

Preparation of polyurethane epoxy resin

Preparation of polyurethane epoxy resin PUEP-1:

adding 0.01mol of polyethylene glycol 200 into a three-neck flask with a stirrer, a thermometer and a nitrogen-introducing device, vacuum dehydrating at 120 ℃ for 2 hours, reducing the temperature to 80 ℃, adding 0.02mol of mixed solution of isophorone diisocyanate and 0.03-wt% (mass fraction of the polyethylene glycol 200) of dibutyltin dilaurate, and reacting at 80 ℃ for 4 hours; then 0.01mol of epoxy propanol is added for reaction for 3 hours at 60 ℃ to obtain polyurethane epoxy acrylate PUEP-1.

Preparation of polyurethane epoxy acrylate PUEP-2:

adding 0.01mol of polyethylene glycol 300 into a three-neck flask provided with a stirrer, a thermometer and a nitrogen-introducing device, carrying out vacuum dehydration at 120 ℃ for 2 hours, reducing the temperature to 80 ℃, adding a mixed solution of 0.02mol of methylene diphenyl diisocyanate and 0.03 and wt% (mass fraction of the polyethylene glycol 300) of dibutyltin dilaurate, and reacting at 80 ℃ for 4 hours; then 0.01mol of epoxy propanol is added for reaction for 3 hours at 60 ℃ to obtain polyurethane epoxy acrylate PUEP-2.

Preparation of rust inhibitor:

preparation of rust inhibitor A-1:

adding 500ppm of neodymium iron boron powder into a perfluoro isobutyl methyl ether dispersion liquid of polytetrafluoroethylene powder (the number average molecular weight of which is 1-1.5 ten thousand) with the mass concentration of 8%, stirring for 1 hour.

Preparation of rust inhibitor A-2:

adding 800ppm of neodymium iron boron powder into a perfluoro isobutyl methyl ether dispersion liquid of polytetrafluoroethylene powder (the number average molecular weight of which is 1-1.5 ten thousand) with the mass concentration of 8%, and stirring for 1 hour.

Example 1

The preparation of the anti-corrosion paint for furniture comprises the following steps:

firstly, preparing the following raw materials in percentage by mass:

Si-APUE-1 50%

rust inhibitor A-1% 10%

Propylene glycol methyl ether acetate 30%

Ethylenediamine 10%

And secondly, uniformly stirring and mixing Si-APUE-1, an antirust agent A-1, propylene glycol methyl ether acetate and ethylenediamine in a container according to the formula to obtain the anticorrosive paint.

Example 2

firstly, preparing the following raw materials in percentage by mass:

Si-APUE-1 52%

rust inhibitor A-1 8%

Propylene glycol methyl ether acetate 30%

Ethylenediamine 10%

Example 3

firstly, preparing the following raw materials in percentage by mass:

Si-APUE-1 55%

rust inhibitor A-1 5%

Propylene glycol methyl ether acetate 30%

Ethylenediamine 10%

Example 4

firstly, preparing the following raw materials in percentage by mass:

Si-APUE-1 50%

rust inhibitor A-2% 10%

Propylene glycol methyl ether acetate 30%

Ethylenediamine 10%

And secondly, uniformly stirring and mixing Si-APUE-1, an antirust agent A-2, propylene glycol methyl ether acetate and ethylenediamine in a container according to the formula to obtain the anticorrosive paint.

Example 5

firstly, preparing the following raw materials in percentage by mass:

Si-APUE-1 52%

rust inhibitor A-2 8%

Propylene glycol methyl ether acetate 30%

Ethylenediamine 10%

Example 6

firstly, preparing the following raw materials in percentage by mass:

Si-APUE-1 55%

rust inhibitor A-2 5%

Propylene glycol methyl ether acetate 30%

Ethylenediamine 10%

Example 7

firstly, preparing the following raw materials in percentage by mass:

Si-APUE-2 50%

rust inhibitor A-1% 10%

Propylene glycol methyl ether acetate 30%

Ethylenediamine 10%

And secondly, uniformly stirring and mixing Si-APUE-2, an antirust agent A-1, propylene glycol methyl ether acetate and ethylenediamine in a container according to the formula to obtain the anticorrosive paint.

Example 8

firstly, preparing the following raw materials in percentage by mass:

Si-APUE-2 50%

rust inhibitor A-2% 10%

Propylene glycol methyl ether acetate 30%

Ethylenediamine 10%

And secondly, uniformly stirring and mixing Si-APUE-2, an antirust agent A-2, propylene glycol methyl ether acetate and ethylenediamine in a container according to the formula to obtain the anticorrosive paint.

Comparative example 1

Preparation of an anticorrosive paint:

firstly, preparing the following raw materials in percentage by mass:

Si-APUE-1 60%

propylene glycol methyl ether acetate 30%

Ethylenediamine 10%

And secondly, uniformly stirring and mixing Si-APUE-1, propylene glycol methyl ether acetate and ethylenediamine in a container according to the formula to obtain the anticorrosive paint.

Comparative example 2

Preparation of an anticorrosive paint:

firstly, preparing the following raw materials in percentage by mass:

Si-APUE-1 45%

rust inhibitor A-2% 15%

Propylene glycol methyl ether acetate 30%

Ethylenediamine 10%

Comparative example 3

Preparation of an anticorrosive paint:

firstly, preparing the following raw materials in percentage by mass:

APUE-1 60%

propylene glycol methyl ether acetate 30%

Ethylenediamine 10%

And secondly, stirring and uniformly mixing APUE-1, propylene glycol methyl ether acetate and ethylenediamine in a container according to the formula to obtain the anticorrosive paint.

Comparative example 4

Preparation of an anticorrosive paint:

firstly, preparing the following raw materials in percentage by mass:

APUE-1 50%

rust inhibitor A-2% 10%

Propylene glycol methyl ether acetate 30%

Ethylenediamine 10%

And secondly, stirring and mixing APUE-1, an antirust agent A-2, propylene glycol methyl ether acetate and ethylenediamine uniformly in a container according to the formula to obtain the anticorrosive paint.

Sample preparation and performance testing:

the anticorrosive paint of each example and comparative example was applied to the surface of a dried stainless 304 stainless steel plate with a thickness of 80 μm and cured at room temperature for 10 days to prepare a corresponding template.

The adhesion, chemical stability and salt spray resistance of the panels were measured.

Adhesion test: using a pull-off method adhesion tester, adhering the adjusted template to a special spindle for testing by using an adhesive, adjusting the state of the spindle for 24 hours at room temperature after adhering, using the pull-off method adhesion tester to pull the spindle, and pulling off the instantaneous Pa when the spindle is pulled off.

Chemical resistance stability test: preparing 10% NaOH solution and 10% H by volume ₂ SO ₄ Solution, 3% nacl solution. Coating the template with rosin seal at 5 mm position on the edge of the test plate, sealing, and respectively placing the test plate into the chemical reagentAnd recording the appearance of the soaking sample plate once a day, checking whether the coating is complete, foaming, falling off and maintaining for 120 days, wherein the process cut-off time is based on the occurrence of bad states such as foaming, falling off and the like.

Salt spray resistance test: and (3) marking a cross by using a blade on the adjusted sample, placing the sample in a salt spray test box, starting the salt spray test box, observing whether a paint film around the cross falls off after a certain time, taking the first observed falling-off phenomenon as test cut-off time, and recording the time.

The test results are shown in Table 1 below:

TABLE 1

As can be seen from comparison of examples 1-8 and comparative examples 1-4 in Table 1, the silicone oil modified polyurethane epoxy resin and the rust inhibitor have synergistic effect, and the adhesion and corrosion resistance of the anticorrosive paint are improved together by compounding the two.

As can be seen from comparison of examples 1-3,4-6,7-8 and comparative examples 1 and 2 in Table 1, as the rust inhibitor in the paint increases, the adhesive force and salt spray resistance of the paint are improved, and the chemical stability is kept better, the additive amount of the rust inhibitor in examples 1 and 4 achieves the best paint performance, which indicates that a certain content of neodymium iron boron and polytetrafluoroethylene powder in the rust inhibitor in the paint brings about the improvement of the adhesive force and corrosion resistance of the paint.

As can be seen from comparison of examples 1-3,4-6,7-8 and comparative examples 3-4 in Table 1, the modification of the main resin in the coating with silicone oil brings about improvement in various properties of the coating.

All numbers or expressions referring to amounts of components, process conditions, etc. used in the specification and claims are to be understood as modified in all instances by "about". All ranges directed to the same component or property are inclusive of the endpoints, which endpoints are independently combinable. Because these ranges are continuous, they include every value between the minimum and maximum values. It should also be understood that any numerical range recited herein is intended to include all sub-ranges within that range.

The above examples only show embodiments of the present invention, and the description thereof is more specific and detailed, but should not be construed as limiting the scope of the invention, but all technical solutions obtained by equivalent substitution or equivalent transformation shall fall within the scope of the invention.

Claims

1. The anticorrosive paint for furniture is characterized by comprising the following components in percentage by mass:

30 to 55 percent of silicone oil modified polyurethane epoxy resin

Rust inhibitor 5-10%

15 to 40 percent of solvent

1% -20% of curing agent;

the silicone oil modified polyurethane epoxy resin is prepared from hydroxyalkyl silicone oil, diisocyanate and epoxypropanol in the presence of a catalyst;

the preparation of the silicone oil modified polyurethane epoxy resin comprises the following steps:

the molar ratio of the hydroxyalkyl silicone oil to the diisocyanate to the epoxypropanol is 1:2:1;

the rust inhibitor is prepared by stirring neodymium iron boron powder in a perfluoro isobutyl methyl ether dispersion liquid of polytetrafluoroethylene powder, and the specific method is as follows: adding 100-1000ppm of neodymium iron boron powder into the perfluoro isobutyl methyl ether dispersion liquid of polytetrafluoroethylene powder, and stirring for 0.5-1 hour to obtain the polytetrafluoroethylene powder; the mass concentration of the polytetrafluoroethylene powder in the perfluoro-isobutyl methyl ether dispersion liquid of the polytetrafluoroethylene powder is 8%.

2. The anticorrosive paint for furniture according to claim 1, wherein the hydroxyalkyl silicone oil is selected from one or more of the following: hydroxyethyl silicone oil, hydroxymethyl silicone oil, hydroxypropyl silicone oil, hydroxybutyl silicone oil;

the diisocyanate is selected from one or more of the following: isophorone diisocyanate (IPDI), naphthalene 1, 5-diisocyanate (NDI), methylene dicyclohexyl isocyanate, methylene diphenyl diisocyanate (MDI), toluene Diisocyanate (TDI), hexamethylene Diisocyanate (HDI), xylylene diisocyanate, hydrogenated xylylene diisocyanate, tetramethylxylylene diisocyanate, p-phenylene diisocyanate, 3' -dimethyldiphenyl-4, 4' -diisocyanate (DDDI), 2, 4-trimethylhexamethylene diisocyanate (TMDI), norbornane Diisocyanate (NDI), and 4,4' -dibenzyl diisocyanate (DBDI) and combinations thereof;

3. The anticorrosive paint for furniture according to claim 2, wherein the catalyst is present in an amount of 0.005 to 3.5% by weight based on the amount of the hydroxyalkyl silicone oil.

4. A furniture anticorrosive paint according to any one of claims 1 to 3, characterized in that,

the particle size of the neodymium iron boron powder is 3-5 microns; the particle size of the polytetrafluoroethylene powder is 5-8 microns.

5. A furniture anticorrosive paint according to any one of claims 1 to 3, wherein the solvent is selected from n-butyl acetate or propylene glycol methyl ether acetate;

6. A method for preparing the anticorrosive paint for furniture according to any one of claims 1 to 5, comprising the steps of:

s1, preparing silicone oil modified polyurethane epoxy resin:

7. Use of the anticorrosive paint for furniture according to any one of claims 1 to 5 in furniture.

8. Use of the anticorrosive paint for furniture according to any one of claims 1 to 5 for improving the corrosion resistance and adhesion to metals of the paint.