CN114656830A - A kind of universal long-acting water-based environmental protection paint remover and its preparation method and use method - Google Patents

Abstract

The invention discloses a universal long-acting water-based environment-friendly paint stripper, a preparation method and a use method thereof, and belongs to the field of paint strippers. A universal long-acting water-based environmentally friendly paint stripper comprises, by weight percentage, 30%-65% deionized water, 5%-30% inorganic alkali, 10%-30% main solvent, 1%-10% A cosolvent and a 5%-20% accelerator; compared with the prior art, a general-purpose long-acting water-based environment-friendly paint stripper of the present application has strong universality of paint; the paint stripping performance is efficient and durable, Long service life and low consumption; free of dichloromethane, phenol, formic acid and low boiling point solvents, safe and environmentally friendly, low volatilization rate at room temperature, low odor, good stability, can well meet transportation and storage requirements; low cost , the production equipment is simple, the preparation method is simple, the use method is simple, and has good economy.

Description

A kind of general long-acting water-based environmental protection paint remover and its preparation method and use method

technical field

The invention relates to the field of paint strippers, in particular to a general long-acting water-based environment-friendly paint stripper and a preparation method and use method thereof.

Background technique

At present, although there are many types of water-based paint strippers on the market, their versatility for paint types is relatively poor, and they are often only suitable for some specific types of powder coatings or paints or water-based paints or electrophoretic paints. When the workpiece is loaded back, the paint stripping effect is not ideal. In addition, most of the water-based paint strippers on the market are mainly of the paint film dissolving type. With the prolongation of use time and the accumulation of paint film dissolution, the paint stripping effect of the paint remover will be greatly reduced, resulting in the consumption of paint remover. Significant increase, and even frequent tank changes are required; therefore, a universal long-acting water-based environmentally friendly paint stripper and a preparation method and a use method thereof are proposed.

SUMMARY OF THE INVENTION

Aiming at the deficiencies of the prior art, the present invention provides a general long-acting water-based environment-friendly paint stripper and a preparation method and a use method thereof.

The object of the present invention can be realized through the following technical solutions:

A general-purpose long-acting water-based environmentally friendly paint remover, the general long-acting water-based environmentally friendly paint remover comprises, by weight percentage, 30%-65% deionized water, 5%-30% inorganic alkali, 10% %-30% main solvent, 1%-10% cosolvent, 5%-20% accelerator, 1%-10% complexing agent, 1%-5% corrosion inhibitor.

Further, the inorganic base is a mixture of one or more of sodium hydroxide, potassium hydroxide, sodium carbonate and potassium carbonate.

Further, the main solvent is benzyl alcohol, dimethyl sulfoxide, sulfolane, N,N-dimethylformamide, morpholine, ethylene glycol monobutyl ether, diethylene glycol butyl ether, ethylene glycol monobutyl ether A mixture of one or more of methyl ether, propylene glycol methyl ether, propylene glycol propyl ether, ethylene glycol phenyl ether, N-methyl-2-pyrrolidone, and N-hydroxyethyl-2-pyrrolidone.

Further, the cosolvent is a mixture of one or more of ethylene glycol, polyethylene glycol 400, glycerol, diethylene glycol, and glycidol.

Further, the accelerator is furfuryl alcohol, tetrahydrofurfuryl alcohol, furfuryl mercaptan, furfuryl polyethylene glycol, tetrahydrofurfuryl polyethylene glycol, furfurylamine, tetrahydrofurfurylamine, 2-phenyldiethanolamine, octadecyl A mixture of one or more of the amines.

Further, the complexing agent is a mixture of one or more of disodium EDTA, tetrasodium EDTA, sodium citrate, sodium oxalate, and sodium gluconate.

Further, the corrosion inhibitor is a mixture of one or more of monoethanolamine, diethanolamine, triethanolamine, diisopropanolamine, triisopropanolamine, and sodium metasilicate pentahydrate.

Further, the resistivity of the deionized water is greater than 4 MΩ·cm.

On the other hand, the present invention also provides a kind of preparation method of the general-purpose long-acting water-based environmentally friendly paint stripper as described in any of the above, comprising the following steps:

Dissolving the inorganic base in deionized water to form a base solution; then adding a main solvent, a cosolvent, a promoter, a complexing agent and a corrosion inhibitor to the base solution in sequence;

Stir to make all components completely dissolved, and obtain the universal long-acting water-based environmental protection paint stripper.

In the third aspect, the present invention also provides a method of using the general-purpose long-acting water-based environmental protection paint remover as described in any of the above, characterized in that the paint to be stripped is completely immersed in the general-purpose In the long-acting water-based environmentally friendly paint stripper, the paint stripping temperature is 70 to 90°C, and the paint stripping time is 1 to 60 minutes.

Beneficial effects of the present invention:

The universal and long-acting water-based environmentally friendly paint stripper provided by the invention has strong versatility and can efficiently remove various conventional types of coatings, such as polyester resins, polyurethane resins, epoxy resins, acrylic resins, alkyd resins, Film-forming resins such as fluorocarbon resins and powder coatings or paints or water-based paints or electrophoretic paints of different curing systems.

The paint stripping performance is efficient and durable, with long service life and low consumption. Through the scientific compounding of various components such as deionized water, inorganic base, main solvent, co-solvent, accelerator, complexing agent and corrosion inhibitor, the paint stripper has excellent paint film stripping effect and moderate paint The film dissolving power can dissolve the coating to a lower degree, and to a greater extent make the coating peel off from the surface of the substrate, and gradually accumulate and precipitate to the bottom of the tank, thereby significantly reducing the dissolution loss of the paint remover. Tank, filter and clean the paint residue, so that the paint stripper can always maintain a good paint stripping effect and greatly prolong the service life of the paint stripper.

Free of dichloromethane, phenol, formic acid and low boiling point solvents. Safe and environmentally friendly, low volatilization rate at room temperature, low odor, good stability, can well meet the requirements of transportation and storage. Has good economy. The cost is low, the production equipment is simple, the preparation method is simple, and the use method is simple.

High-efficiency and long-lasting paint stripping performance, long service life and low consumption; free of dichloromethane, phenol, formic acid and low-boiling point solvents, safe and environmentally friendly, low volatilization rate at room temperature, low odor, good stability, and can well meet transportation requirements and storage requirements; low cost, simple production equipment, simple preparation method, simple use method, and good economy.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In the description of this specification, description with reference to the terms "one embodiment," "example," "specific example," etc. means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one aspect of the present invention. in one embodiment or example. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

A general-purpose long-acting water-based environmentally friendly paint remover, the general long-acting water-based environmentally friendly paint remover comprises, by weight percentage, 30%-65% deionized water, 5%-30% inorganic alkali, 10% %-30% main solvent, 1%-10% cosolvent, 5%-20% accelerator, 1%-10% complexing agent, 1%-5% corrosion inhibitor.

Further, the inorganic base is a mixture of one or more of sodium hydroxide, potassium hydroxide, sodium carbonate and potassium carbonate.

Further, the main solvent is benzyl alcohol, dimethyl sulfoxide, sulfolane, N,N-dimethylformamide, morpholine, ethylene glycol monobutyl ether, diethylene glycol butyl ether, ethylene glycol monobutyl ether A mixture of one or more of methyl ether, propylene glycol methyl ether, propylene glycol propyl ether, ethylene glycol phenyl ether, N-methyl-2-pyrrolidone, and N-hydroxyethyl-2-pyrrolidone.

Further, the cosolvent is a mixture of one or more of ethylene glycol, polyethylene glycol 400, glycerol, diethylene glycol, and glycidol.

Further, the accelerator is furfuryl alcohol, tetrahydrofurfuryl alcohol, furfuryl mercaptan, furfuryl polyethylene glycol, tetrahydrofurfuryl polyethylene glycol, furfurylamine, tetrahydrofurfurylamine, 2-phenyldiethanolamine, octadecyl A mixture of one or more of the amines.

Further, the complexing agent is a mixture of one or more of disodium EDTA, tetrasodium EDTA, sodium citrate, sodium oxalate, and sodium gluconate.

Further, the corrosion inhibitor is a mixture of one or more of monoethanolamine, diethanolamine, triethanolamine, diisopropanolamine, triisopropanolamine, and sodium metasilicate pentahydrate.

Further, the resistivity of the deionized water is greater than 4 MΩ·cm.

Embodiment 1: a general long-acting water-based environmentally friendly paint remover contains the components shown in Table 1

Table 1

paint remover ingredients weight percentage Deionized water 50% sodium hydroxide 15% Benzyl alcohol 10% Ethylene Glycol 5% Tetrahydrofurfurylamine 10% Sodium Gluconate 5% Triethanolamine 5%

The preparation method of the above-mentioned paint stripper is as follows: first, sodium hydroxide is dissolved in deionized water to form a base solution, then benzyl alcohol, ethylene glycol, tetrahydrofurfurylamine, sodium gluconate and triethanolamine are added successively, and all components are stirred to make the base solution. Parts were completely dissolved to obtain the paint remover.

The method of using the above-mentioned paint stripper for stripping paint is as follows: completely immerse the painted part to be stripped in the paint stripper, the temperature is 80° C., and the temperature is kept for 60 minutes.

Embodiment 2: a general-purpose long-acting water-based environmentally friendly paint stripper contains the components shown in Table 2:

Table 2

paint remover ingredients weight percentage Deionized water 30% sodium hydroxide 15% Potassium hydroxide 5% Benzyl alcohol 10% Propylene Glycol Methyl Ether 10% Ethylene Glycol 2% furfuryl alcohol 10% Tetrahydrofurfurylamine 5% Disodium EDTA 10% Diisopropanolamine 3%

The preparation method of the above-mentioned paint stripper is: first dissolving sodium hydroxide and potassium hydroxide in deionized water to form a base solution, then adding benzyl alcohol, propylene glycol methyl ether, ethylene glycol, furfuryl alcohol, tetrahydrofurfurylamine, ethyl alcohol successively. Disodium diaminetetraacetate and diisopropanolamine are stirred to completely dissolve all components to obtain the paint stripper.

The method of using the above-mentioned paint stripper for paint stripping is the same as that in Example 1.

Embodiment 3: a kind of general-purpose long-acting water-based environmentally friendly paint remover contains the components shown in Table 3

table 3

paint remover ingredients weight percentage Deionized water 30% Potassium hydroxide 15% Benzyl alcohol 10% Propylene Glycol Methyl Ether 10% Glycol phenyl ether 5% Ethylene Glycol 8% tetrahydrofurfuryl alcohol 10% Tetrahydrofurfurylamine 2% Sodium citrate 8% Triisopropanolamine 2%

The preparation method of the above-mentioned paint stripper is: first, potassium hydroxide is dissolved in deionized water to form a base liquid, and then benzyl alcohol, propylene glycol methyl ether, ethylene glycol phenyl ether, ethylene glycol, tetrahydrofurfuryl alcohol, tetrahydrofurfuryl alcohol are added successively. furfurylamine, sodium citrate and triisopropanolamine, and stirring to completely dissolve all components to obtain the paint stripper.

The method of using the above-mentioned paint stripper for paint stripping is the same as that in Example 1.

The painted parts to be stripped of the same material, same volume and same surface area are respectively coated with polyester powder coating, epoxy powder coating, polyurethane paint, fluorocarbon paint, alkyd paint, acrylic water-based paint and cathodic electrophoretic paint.

600；The polyester powder coating used is from AkzoNobel Powder Coatings

600;

100；Epoxy powder coatings used are from AkzoNobel Powder Coatings

100;

The polyurethane paint used is from Beko Industrial Coatings DJ-291-98001;

The fluorocarbon paint used is from Beco Industrial Coatings FJ-233-98001;

The alkyd paint used is from Beco Industrial Coatings AD-621-98001;

LKD1030；Acrylic water-based paint used from Sherwin-Williams

LKD1030;

800。The cathodic electrocoat used is from BASF cathodic electrocoat

800.

After inspection, the paint removers obtained from the formulas of Examples 1 to 3 can remove the paints of 6 different systems at 80°C and within a working time of 60 minutes, and the paint stripping rate is 100%. %. See Table 4 for details:

Table 4

In addition, after inspection, the paint strippers obtained from the formulations of Examples 1 to 3 can also be used to remove 6 kinds of paints without residues at 80 ° C and 60 minutes of action time for 6 kinds of paints after aging. The paint stripping rate is 100%. See Table 5 for details:

table 5

In the present invention, inorganic alkali components are preferred, and under strong alkali conditions, coatings containing ester bonds (polyester, polyurethane, alkyd, etc.) are prone to hydrolysis, thereby rapidly peeling off. Aqueous solvents containing aromatic hydrocarbon functional groups are preferred, and the low-polarity characteristics of aromatic hydrocarbon functional groups are used to increase the similar compatibility effect with the same low-polarity coating (acrylic, epoxy, fluorocarbon, etc.), thereby helping to improve paint stripping. The osmotic swelling effect of the agent components on the coating. Preference is given to specific accelerators and complexing agents, which can significantly promote the penetration swelling peeling of the coating by the paint stripper component. At the same time, it can also endow the paint stripper with more efficient and lasting paint stripping effect. The use method of heating and soaking is preferred, which can further accelerate the interaction between the components, and greatly improve the penetration, swelling and peeling effects of the paint remover on the coating.

The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions only illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have Various changes and modifications fall within the scope of the claimed invention.

Claims (10)

1. a general-purpose long-acting water-based environmental protection paint remover, is characterized in that, the water-based environmental-friendly paint remover of described general long-acting type comprises by weight percentage, 30%-65% deionized water, 5%-30% % inorganic base, 10%-30% main solvent, 1%-10% cosolvent, 5%-20% accelerator, 1%-10% complexing agent, 1%-5% corrosion inhibitor agent. 2. the water-based environmental protection paint stripper of general long-acting type according to claim 1, is characterized in that, described inorganic base is one or more in sodium hydroxide, potassium hydroxide, sodium carbonate, salt of wormwood mixture. 3. the water-based environmental protection paint stripper of general long-acting type according to claim 1, is characterized in that, described main solvent is benzyl alcohol, dimethyl sulfoxide, sulfolane, N,N-dimethylformamide, Morpholine, ethylene glycol monobutyl ether, diethylene glycol butyl ether, ethylene glycol monomethyl ether, propylene glycol methyl ether, propylene glycol propyl ether, ethylene glycol phenyl ether, N-methyl-2-pyrrolidone, N-hydroxyl Mixtures of one or more of ethyl-2-pyrrolidone. 4. the water-based environmental protection paint stripper of general long-acting type according to claim 1, is characterized in that, described cosolvent is ethylene glycol, polyethylene glycol 400, glycerol, diethylene glycol, propylene oxide A mixture of one or more of the alcohols. 5. the water-based environmental protection paint stripper of general long-acting type according to claim 1, is characterized in that, accelerator is furfuryl alcohol, tetrahydrofurfuryl alcohol, furfuryl mercaptan, furfuryl polyethylene glycol, tetrahydrofurfuryl poly A mixture of one or more of ethylene glycol, furfurylamine, tetrahydrofurfurylamine, 2-phenyldiethanolamine, and octadecylamine. 6. the water-based environmental protection paint stripper of general long-acting type according to claim 1, is characterized in that, described complexing agent is disodium EDTA, tetrasodium EDTA, sodium citrate, A mixture of one or more of sodium oxalate and sodium gluconate. 7. the water-based environmental protection paint stripper of general long-acting type according to claim 1, is characterized in that, corrosion inhibitor is monoethanolamine, diethanolamine, triethanolamine, diisopropanolamine, triisopropanolamine, five A mixture of one or more of water sodium metasilicate. 8. The general-purpose long-acting water-based environmentally friendly paint stripper according to claim 1, wherein the resistivity of the deionized water is greater than 4 MΩ·cm. 9. the preparation method of the water-based environmental protection paint stripper of a general long-acting type as described in any one of claim 1-8, is characterized in that, comprises the following steps: Dissolving the inorganic base in deionized water to form a base solution; then adding a main solvent, a cosolvent, a promoter, a complexing agent and a corrosion inhibitor to the base solution in sequence; Stir to make all components completely dissolved, and obtain the universal long-acting water-based environmental protection paint stripper. 10. the using method of the water-based environment-friendly paint stripper of a general long-acting type as described in any one of claim 1-8, it is characterized in that, the coating part to be stripped is completely immersed in described general long-acting In the type of water-based environmentally friendly paint stripper, the paint stripping temperature is 70 to 90°C, and the paint stripping time is 1 to 60 minutes.