WO2018041129A1

WO2018041129A1 - Epoxy emulsion and preparation method therefor

Info

Publication number: WO2018041129A1
Application number: PCT/CN2017/099631
Authority: WO
Inventors: 刘善江; 刘占川; 梅少峰; 胡中源; 董立志; 楚会来; 王亚轩
Original assignee: 河北晨阳工贸集团有限公司
Priority date: 2016-08-30
Filing date: 2017-08-30
Publication date: 2018-03-08
Also published as: CN106221506A; CN106221506B; PH12019500446A1

Abstract

An epoxy emulsion, comprising the following raw materials: solid epoxy resin, a nonionic emulsifier, an anionic emulsifier, and a cosolvent. The solid epoxy resin is a mixture of epoxy resin E-20 and epoxy resin E-12. The mass ratio of the epoxy resin E-20 to the epoxy resin in the solid epoxy resin is 4-2:1. The amount of the nonionic emulsifier is 6-9% of the mass of the solid epoxy resin. The amount of the anionic emulsifier is 0.5-2% of the mass of the solid epoxy resin. The amount of the cosolvent is 8% of the mass of the solid epoxy resin. The epoxy emulsion is prepared by uniformly stirring the solid epoxy resin, the nonionic emulsifier, the anionic emulsifier, and the cosolvent.

Description

Epoxy 3⁄4 ΐ and preparation method thereof

[0001] The present invention relates to the field of epoxy resin emulsion technology.

Background technique

[0002] Epoxy resin has high hardness, good wear resistance, high adhesion and excellent chemical resistance. It can be widely used as wood lacquer, industrial floor coating, anti-corrosion coating, adhesive and ink. With the improvement of the quality of life, people's environmental protection requirements for coatings are becoming more and more strict, so the traditional solvent-based epoxy resin can not meet people's pursuit. In recent years, water-based epoxy resins using water as a dispersion medium have been increasingly favored by people.

[0003] Waterborne epoxy resin refers to a type of coating that does not contain organic solvents or has a very low content, saves energy, is non-polluting, and meets environmental requirements. Water-based epoxy resin is not only easy to store, transport and use, but also has a wide application environment. It can be used in greenhouses and humid environments. It can compensate for the water-sensitive weakness of solvent and solvent-free epoxy coatings, and the construction performance is good. Adjust the construction viscosity, the construction tools can be directly cleaned with water to reduce construction costs.

[0004] The existing epoxy emulsion has the disadvantages of low corrosion resistance, poor emulsion stability, slow drying and high VOC content, which limits the application of the epoxy emulsion.

technical problem

[0005] The technical problem to be solved by the present invention is to provide an epoxy emulsion and a preparation method thereof. The epoxy emulsion has strong anti-corrosion ability, does not blister, does not fall off, does not rust, has small and uniform particle size, and has emulsion stability. Good, can participate in co-grinding, fast drying, low VOC content.

Problem solution

Technical solution

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: an epoxy emulsion comprising the following raw materials: solid epoxy resin, nonionic emulsifier, anionic emulsifier and cosolvent, uniformly obtained by stirring The solid epoxy resin is a mixture of epoxy resin Ε-20 and epoxy resin E-12, and the mass ratio of epoxy resin Ε-20 to epoxy resin in the solid epoxy resin is 4-2:1; Nonionic emulsifier is solid The epoxy resin is 6-9% by mass; the anionic emulsifier is 0.5-2% by mass of the solid epoxy resin; and the amount of the cosolvent is 8% by mass of the solid epoxy resin.

[0007] Preferably, the nonionic emulsifier consists of the following components in percentage by weight:

[0008] Epoxy resin E-20 5-15%,

[0009] Epoxy resin E-51 0.5-2%,

[0010] polyethylene glycol 6000 50-70%,

[0011] boron trifluoride ether 0.1-0.5%,

[0012] Propylene glycol methyl ether acetate 20-32.5%.

[0013] The preparation method of the nonionic emulsifier comprises the following steps:

[0014] (1) Epoxy resin E-20, epoxy resin E-51, polyethylene glycol 6000 and propylene glycol methyl ether acetate are mixed, heated, heated to 60-80 ° C heat preservation, until the material is completely melted;

[0015] (2) After the melting, the mixture is kept for 0.8-2 hours, and boron trifluoride etherate is added dropwise, and the reaction is terminated after 1 to 2 hours, thereby obtaining a nonionic emulsifier.

[0016] Preferably, the anionic emulsifier consists of the following components in percentage by weight:

[0017] p-aminobenzoic acid 10-20%;

[0018] propylene glycol methyl ether acetate 30-50%;

[0019] butyl glycidyl ether 10-20%;

[0020] Epoxy resin E-51 10-30%;

[0021] boron trifluoride etherate 0.1-0.5%;

[0022] dimethylethanolamine 5-10%;

[0023] Deionized water 10-30%.

[0024] The preparation method of the anionic emulsifier comprises the following steps:

[0025] (1) p-aminobenzoic acid and a half amount of propylene glycol methyl ether acetate mixed, heated to 50-60 ° C;

[0026] (2) after the dropwise addition of butyl glycidyl ether, 0.5-lh;

[0027] (3) The temperature is raised to 70-80. C, adding boron trifluoride etherate, stirring, liquid system transparent reaction after l-2h;

[0028] (4) maintaining the temperature at 70-80 ° C, the epoxy resin E-51 is dissolved in the other half of the amount of propylene glycol methyl ether acetate, added to the liquid system obtained in step (3), stirring , after transparent, the reaction is l-2h;

[0029] (5) Add dimethylethanolamine and deionized water at 70-80 ° C, stir evenly to obtain anionic emulsification Agent.

[0030] Preferably, the co-solvent is ethylene glycol butyl ether.

[0031] The preparation method of the epoxy emulsion comprises the following steps: placing the solid epoxy resin and the co-solvent in an emulsifier, heating and melting at 90-115 ° C, adding a non-ionic emulsifier and an anionic emulsifier, and stirring uniformly. Adding hot water at 85-95 ° C until the solid content reaches 50-55 wt%, and obtaining an epoxy emulsion.

Advantageous effects of the invention

Beneficial effect

[0032] The beneficial effects produced by the above technical solution are as follows: the epoxy emulsion of the invention is based on epoxy resin E-20, and the epoxy resin E-12 is used to improve the anticorrosive performance of the product; using polyethylene glycol and ring An ionic resin-synthesized nonionic emulsifier emulsifies a resin with an anionic emulsifier synthesized from p-aminobenzoic acid and an epoxy resin. The anionic emulsifier can obtain an epoxy emulsion product with good stability, and the nonionic emulsifier can effectively reduce the particle size of the emulsion and improve the water resistance and salt spray resistance of the emulsion. The nonionic emulsifier and the anionic emulsifier are used together with the emulsifying epoxy resin, which is much less than the amount of an emulsifier alone. The two emulsifiers are arranged at intervals in the emulsion interface, and the packing density is larger than that of an emulsifier alone. More, the synergistic effect of the two emulsifiers makes the emulsion more stable. The product of the invention has the advantages of small particle size and uniformity, good emulsion stability, and can participate in co-grinding, fast drying and strong anti-corrosion ability.

BEST MODE FOR CARRYING OUT THE INVENTION

[0033] The present invention will be further described in detail below in conjunction with the specific embodiments.

Embodiment 1

[0035] An epoxy emulsion comprising the following raw materials: a solid epoxy resin, a nonionic emulsifier, an anionic emulsifier and a co-solvent; wherein the solid epoxy resin is an epoxy resin E-20 and an epoxy resin E-12 The mixture, the solid epoxy resin E-20 and epoxy resin mass ratio is 4:1; the nonionic emulsifier is 7% of the mass of the solid epoxy resin; the anionic emulsifier is solid epoxy resin 1.5% by mass; the amount of cosolvent is 8% by mass of solid epoxy resin.

[0036] The preparation method of the epoxy emulsion comprises the following steps: placing the solid epoxy resin and the co-solvent in an emulsifier, heating and melting at 90-95 ° C, adding a non-ionic emulsifier and an anionic emulsifier, and stirring uniformly. After adding hot water at 85-90 ° C until the solid content reaches 50 wt%, an epoxy emulsion is obtained. [0037] wherein, the nonionic emulsifier is composed of the following components by weight: epoxy resin E-20 12%, epoxy resin E-51 0.5%, polyethylene glycol 6000 67.4%, boron trifluoride etherate 0.1 %, propylene glycol methyl ether acetate 20%. The preparation method of the nonionic emulsifier comprises the following steps: (1) weighing the above components by weight, epoxy resin E-20, epoxy resin E-51, polyethylene glycol 6000, propylene glycol methyl ether acetate The ester is added to the four-necked flask; the four-necked flask is heated, heated to 60-65 ° C, and kept warm until the material is completely melted; (2) After melting, a small crucible is kept, and boron trifluoride etherate is slowly dropped into four In the bottle; after 2 hours of incubation, the reaction was terminated, and a nonionic emulsifier was obtained.

[0038] The anionic emulsifier consists of the following components by weight: p-aminobenzoic acid 10%; propylene glycol methyl ether acetate 30%; butyl glycidyl ether 14.9%; epoxy resin E-51 10%; trifluoride Boron ether 0.1%; dimethylethanolamine 5%; deionized water 30%. The preparation method of the anionic emulsifier comprises the following steps: (1) weighing the above components by weight, adding p-aminobenzoic acid and half of the amount of propylene glycol methyl ether acetate to a four-necked flask, and heating the four-necked flask , heating to 50-55 ° C; (2) butyl glycidyl ether was dropped into a four-necked flask within 2 h, kept for 1 h; (3) warmed to 70-75. C, adding boron trifluoride diethyl ether, stirring, the liquid is transparent and reacting for 1.5h; (4) keeping the temperature of the epoxy resin E- 51 into the other half of the propylene glycol methyl ether acetate while maintaining the temperature at 70-75 ° C After the middle, it is added to the liquid system obtained in the step (3), stirred, and reacted transparently for 2 hours; (5) at 70-75. Add dimethylethanolamine and deionized water under C and stir well to obtain an anionic emulsifier.

Example 2

[0040] An epoxy emulsion comprising the following raw materials: a solid epoxy resin, a nonionic emulsifier, an anionic emulsifier and a cosolvent; wherein the solid epoxy resin is an epoxy resin E-20 and an epoxy resin E-12 The mixture, the epoxy resin E-20 and epoxy resin mass ratio of solid epoxy resin is 3:1; the nonionic emulsifier is 6% of the mass of solid epoxy resin; the anionic emulsifier is solid epoxy resin 2% by mass; the amount of cosolvent is 8% by mass of solid epoxy resin.

[0041] The preparation method of the epoxy emulsion comprises the following steps: placing the solid epoxy resin and the co-solvent in an emulsification kettle, heating and melting at 95-100 ° C, adding a non-ionic emulsifier and an anionic emulsifier, and stirring uniformly. After adding hot water at 90-95 ° C until the solid content reached 55 wt%, an epoxy emulsion was obtained.

[0042] wherein, the nonionic emulsifier is composed of the following components by weight: epoxy resin E-20 5%, epoxy resin E-51 2%, polyethylene glycol 6000 70%, boron trifluoride etherate 0.2 <3⁄4, propylene glycol methyl ether acetate 22.8%. The preparation method of the nonionic emulsifier comprises the following steps: (1) weighing the above components by weight, epoxy resin E-20, epoxy resin E-51, polyethylene glycol 6000, propylene glycol methyl ether acetate The ester was added to the four-necked flask; the four-necked flask was heated, heated to 65-70 ° C, and kept warm until the material was completely melted; (2) After the melting, the temperature was kept for 0.8 hours, and the boron trifluoride etherate was slowly dropped into the four ports. In the bottle; after 2 hours of incubation, the reaction was terminated, and a nonionic emulsifier was obtained.

[0043] The anionic emulsifier consists of the following components by weight: p-aminobenzoic acid 15%; propylene glycol methyl ether acetate 30%; butyl glycidyl ether 10%; epoxy resin E-51 20%; trifluoride Boron ether 0.2%; dimethylethanolamine 10%; deionized water 14.8%. The preparation method of the anionic emulsifier comprises the following steps: (1) weighing the above components by weight, adding p-aminobenzoic acid and half of the amount of propylene glycol methyl ether acetate to a four-necked flask, and heating the four-necked flask , heating to 55-60 ° C; (2) butyl glycidyl ether was dropped into a four-necked flask over 1 h, incubated for 0.5 h; (3) warmed to 75-80. C, adding boron trifluoride diethyl ether, stirring, the liquid is transparent and reacting for 2h; (4) keeping the temperature of the epoxy resin E-51 into the other half of the propylene glycol methyl ether acetate while maintaining the temperature at 75-80 ° C Thereafter, it is added to the liquid system obtained in the step (3), stirred, and then reacted transparently for 1 hour; (5) at 75-80. Add dimethylethanolamine and deionized water under C and stir well to obtain an anionic emulsifier.

Embodiment 3

[0045] An epoxy emulsion comprising the following raw materials: a solid epoxy resin, a nonionic emulsifier, an anionic emulsifier and a co-solvent; wherein the solid epoxy resin is an epoxy resin E-20 and an epoxy resin E-12 The mixture, the solid epoxy resin E-20 and epoxy resin mass ratio is 2:1; the nonionic emulsifier is 9% of the mass of the solid epoxy resin; the anionic emulsifier is the solid epoxy resin 0.5% by mass; the amount of cosolvent is 8% by mass of solid epoxy resin.

[0046] The preparation method of the epoxy emulsion comprises the following steps: placing the solid epoxy resin and the co-solvent in an emulsifier, heating and melting at 100-105 ° C, adding a non-ionic emulsifier and an anionic emulsifier, and stirring uniformly. After adding hot water at 88-93 ° C until the solid content reached 51 wt%, an epoxy emulsion was obtained.

[0047] wherein, the nonionic emulsifier consists of the following components by weight: epoxy resin E-20 10%, epoxy resin E-51 1%, polyethylene glycol 6000 60%, boron trifluoride etherate 0.3 %, propylene glycol methyl ether acetate 28.7%. The preparation method of the nonionic emulsifier comprises the following steps: (1) weighing the above components by weight, epoxy resin E-20, epoxy resin E-51, polyethylene glycol 6000, propylene glycol methyl ether acetate Ester Add to the four-necked flask; heat the four-necked flask, heat it to 70-75 ° C, keep warm until the material is completely melted; (2) keep it for 2 hours after melting, slowly drip the boron trifluoride etherate into the four-necked bottle The reaction was terminated after 1.5 h of incubation to obtain a nonionic emulsifier.

[0048] The anionic emulsifier consists of the following components by weight: p-aminobenzoic acid 10%; propylene glycol methyl ether acetate 50%; butyl glycidyl ether 10%; epoxy resin E-51 10%; trifluoride Boron ether 0.5%; dimethylethanolamine 9.5%; deionized water 10%. The preparation method of the anionic emulsifier comprises the following steps: (1) weighing the above components by weight, adding p-aminobenzoic acid and half of the amount of propylene glycol methyl ether acetate to a four-necked flask, and heating the four-necked flask , heating to 52-57 ° C; (2) butyl glycidyl ether was dropped into a four-necked flask within 1.5 h, kept for 1 h; (3) warmed to 72-77. C, adding boron trifluoride etherate, stirring, the liquid is transparent and reacting for 1 hour; (4) keeping the temperature of the epoxy resin E-51 into the other half of the propylene glycol methyl ether acetate while maintaining the temperature at 72-77 ° C Thereafter, it was added to the liquid system obtained in the step (3), stirred, and then reacted transparently for 1.5 hours; (5) Dimethylethanolamine and deionized water were added at 72-77 ° C, and the mixture was stirred to obtain an anionic emulsifier.

Example 4

[0050] An epoxy emulsion comprising the following raw materials: a solid epoxy resin, a nonionic emulsifier, an anionic emulsifier and a co-solvent; wherein the solid epoxy resin is an epoxy resin E-20 and an epoxy resin E-12 The mixture, the solid epoxy resin E-20 and epoxy resin mass ratio is 2.5:1; the nonionic emulsifier is 8% of the solid epoxy resin; the anionic emulsifier is solid epoxy resin 1% by mass; the amount of cosolvent is 8% by mass of solid epoxy resin.

[0051] The preparation method of the epoxy emulsion comprises the following steps: placing the solid epoxy resin and the co-solvent in an emulsification kettle, heating and melting at 105-110 ° C, adding a nonionic emulsifier and an anionic emulsifier, and stirring uniformly. After adding hot water at 85-95 ° C until the solid content reached 52 wt%, an epoxy emulsion was obtained.

[0052] wherein, the nonionic emulsifier consists of the following components by weight: epoxy resin E-20 15%, epoxy resin E-51 2%, polyethylene glycol 6000 50%, boron trifluoride etherate 0.5 %, propylene glycol methyl ether acetate 32.5%. The preparation method of the nonionic emulsifier comprises the following steps: (1) weighing the above components by weight, epoxy resin E-20, epoxy resin E-51, polyethylene glycol 6000, propylene glycol methyl ether acetate The ester is added to the four-necked flask; the four-necked flask is heated, heated to 75-80 ° C, and kept warm until the material is completely melted; (2) After melting, a small crucible is kept, and boron trifluoride etherate is slowly dropped into four In the bottle; insulation lh The reaction is terminated and a nonionic emulsifier is obtained.

[0053] The anionic emulsifier consists of the following components by weight: p-aminobenzoic acid 10%; propylene glycol methyl ether acetate 40%; butyl glycidyl ether 20%; epoxy resin E-51 13.7%; trifluoride Boron ether 0.3%; dimethylethanolamine 6%; deionized water 10%. The preparation method of the anionic emulsifier comprises the following steps: (1) weighing the above components by weight, adding p-aminobenzoic acid and half of the amount of propylene glycol methyl ether acetate to a four-necked flask, and heating the four-necked flask , heating to 50-60 ° C; (2) butyl glycidyl ether into a four-necked flask within 1.5h, held for 45min; (3) warmed to 70-80 ° C, added boron trifluoride etherate, After stirring, the liquid is transparent and reacted for 1.5 hours; (4) while maintaining the temperature at 70-80 ° C, the epoxy resin E-51 is dissolved in the other half of the propylene glycol methyl ether acetate, and then added to the step (3). In the obtained liquid system, the mixture was stirred and allowed to react for 1.5 hours after being transparent; (5) Dimethylethanolamine and deionized water were added at 70-80 ° C, and the mixture was stirred uniformly to obtain an anionic emulsifier.

Example 5

An epoxy emulsion comprising the following raw materials: a solid epoxy resin, a nonionic emulsifier, an anionic emulsifier and a co-solvent; wherein the solid epoxy resin is an epoxy resin E-20 and an epoxy resin E-12 The mixture, the solid epoxy resin E-20 and epoxy resin mass ratio is 3.5:1; the nonionic emulsifier is 7% of the mass of the solid epoxy resin; the anionic emulsifier is solid epoxy resin 1.25% by mass; the amount of cosolvent is 8% by mass of solid epoxy resin.

[0056] The preparation method of the epoxy emulsion comprises the following steps: placing the solid epoxy resin and the co-solvent in an emulsifier, heating and melting at 110-115 ° C, adding a non-ionic emulsifier and an anionic emulsifier, and stirring uniformly. When 85-95 ° C hot water was added until the solid content reached 53 wt%, an epoxy emulsion was obtained.

[0057] wherein, the nonionic emulsifier is composed of the following components by weight: epoxy resin E-20 8%, epoxy resin E-51 0.5%, polyethylene glycol 6000 67.4%, boron trifluoride etherate 0.1 %, propylene glycol methyl ether acetate 24%. The preparation method of the nonionic emulsifier comprises the following steps: (1) weighing the above components by weight, epoxy resin E-20, epoxy resin E-51, polyethylene glycol 6000, propylene glycol methyl ether acetate The ester is added to the four-necked flask; the four-necked flask is heated, heated to 60-70 ° C, and kept warm until the material is completely melted; (2) After melting, a small crucible is kept, and boron trifluoride etherate is slowly dropped into four In the bottle; the reaction was terminated after 1.5 h of incubation, and a nonionic emulsifier was obtained.

[0058] The anionic emulsifier consists of the following components by weight: p-aminobenzoic acid 10%; propylene glycol methyl ether Acetate 30%; butyl glycidyl ether 14.9%; epoxy resin E-51 30%; boron trifluoride ether 0.1%; dimethylethanolamine 5%; deionized water 10%. The preparation method of the anionic emulsifier comprises the following steps: (1) weighing the above components by weight, adding p-aminobenzoic acid and half of the amount of propylene glycol methyl ether acetate to a four-necked flask, and heating the four-necked flask , heating to 50-60 ° C; (2) butyl glycidyl ether into a four-necked flask within 1.5h, held for 45min; (3) warmed to 70-80 ° C, added boron trifluoride etherate, After stirring, the liquid is transparent and reacted for 1.5 hours; (4) while maintaining the temperature at 70-80 ° C, the epoxy resin E-51 is dissolved in the other half of the propylene glycol methyl ether acetate, and then added to the step (3). In the obtained liquid system, the mixture was stirred and allowed to react for 1.5 hours after being transparent; (5) Dimethylethanolamine and deionized water were added at 70-80 ° C, and the mixture was stirred uniformly to obtain an anionic emulsifier.

Example 6

An epoxy emulsion comprising the following raw materials: a solid epoxy resin, a nonionic emulsifier, an anionic emulsifier and a cosolvent; wherein the solid epoxy resin is an epoxy resin E-20 and an epoxy resin E-12 a mixture of solid epoxy resin E-20 and epoxy resin mass ratio of 3:1; nonionic emulsifier dosage of solid epoxy resin 8%; anionic emulsifier amount of solid epoxy resin 1.5% by mass; the amount of cosolvent is 8% by mass of solid epoxy resin.

[0061] The preparation method of the epoxy emulsion comprises the following steps: placing the solid epoxy resin and the co-solvent in an emulsification kettle, heating and melting at 100-110 ° C, adding a nonionic emulsifier and an anionic emulsifier, and stirring uniformly. Adding 85-95 ° C hot water until the solid content reaches 54 wt%, an epoxy emulsion is obtained.

[0062] wherein, the nonionic emulsifier is composed of the following components by weight: epoxy resin E-20 9.4%, epoxy resin E-51 0.5%, polyethylene glycol 6000 70%, boron trifluoride etherate 0.1 %, propylene glycol methyl ether acetate 20%. The preparation method of the nonionic emulsifier comprises the following steps: (1) weighing the above components by weight, epoxy resin E-20, epoxy resin E-51, polyethylene glycol 6000, propylene glycol methyl ether acetate The ester is added to the four-necked flask; the four-necked flask is heated, heated to 70-80 ° C for heat preservation, and kept warm until the material is completely melted; (2) After melting, a small crucible is kept, and boron trifluoride etherate is slowly dropped into four In the bottle; after 2 hours of incubation, the reaction was terminated, and a nonionic emulsifier was obtained.

[0063] The anionic emulsifier consists of the following components by weight: p-aminobenzoic acid 20%; propylene glycol methyl ether acetate 30%; butyl glycidyl ether 10%; epoxy resin E-51 21.6%; trifluoride Boron ether 0.4%; dimethylethanolamine 8%; deionized water 10%. The preparation method of the anionic emulsifier comprises the following steps : (1) Weighing the above components by weight, adding p-aminobenzoic acid and half of propylene glycol methyl ether acetate to a four-necked flask, heating the four-necked flask to 50-60 ° C; 2) butyl glycidyl ether was dropped into a four-necked flask over 1.5 h, and kept for 45 min; (3) The temperature was raised to 70-80 ° C, boron trifluoride etherate was added, stirred, and the liquid was transparent and reacted for 1.5 h; (4) After maintaining the temperature at 70-80 ° C, the epoxy resin E-51 is dissolved in the other half of the propylene glycol methyl ether acetate, and then added to the liquid system obtained in the step (3), stirred, and transparent. The reaction was carried out for 1.5 h; (5) Dimethylethanolamine and deionized water were added at 70-80 ° C, and the mixture was stirred to obtain an anionic emulsifier.

[0064] Comparing the performance of Example 1 with the comparative example, the test results obtained are shown in Table 1:

Comparative Example: Shanghai Xinhua Resin Factory STW703A Waterborne Epoxy Resin;

[0066] The epoxy emulsion prepared in Example 1;

[0067] The comparative example is a STW703A waterborne epoxy resin of a Shanghai Xinhua Resin Factory which is used in a large amount on the market. It is sprayed on the tinplate and cold-rolled steel plate by using two waterborne epoxy resin paints of Example 1 and the comparative example. The same thickness, test dryness and salt spray resistance after 7 days of curing.

[0068] The VOC content of Example 1 of 40 mg / g is much lower than the comparative example of 100 mg / g; salt spray resistance of Example 1 720h no blister, no shedding, no rust, the comparison is only 480h; In the dry day, the anionic emulsifier was added in Example 1 to increase the surface dryness, and the dryness in the table of Example 1 was 10 min, and the comparative example was about 30 min.

Claims

Claim

[Claim 1] An epoxy emulsion comprising the following raw materials: a solid epoxy resin, a nonionic emulsifier, an anionic emulsifier, and a cosolvent, which are uniformly obtained by stirring;

Wherein, the solid epoxy resin is a mixture of epoxy resin E-20 and epoxy resin E-12, and the mass ratio of epoxy resin E-20 and epoxy resin in the solid epoxy resin is 4-2:1;

The amount of nonionic emulsifier is 6-9% of the mass of the solid epoxy resin;

The amount of anionic emulsifier is 0.5-2% of the mass of the solid epoxy resin;

The amount of cosolvent is 8% of the mass of solid epoxy resin;

The nonionic emulsifier is composed of the following components by weight: epoxy resin E-20 5-15%,

Epoxy resin E-51 0.5-2%

Polyethylene glycol 6000 50-70%,

Boron trifluoride ether 0.1-0.5%

Propylene glycol methyl ether acetate 20-32.5%;

The anionic emulsifier is composed of the following components in weight percentage: p-aminobenzoic acid 10-20%;

Propylene glycol methyl ether acetate 30-50% ;

Butyl glycidyl ether 10-20% ;

Epoxy resin E-51 10-30%;

Boron trifluoride ether 0.1-0.5%;

Dimethylethanolamine 5-10%;

Deionized water 10-30%.

[Claim 2] An epoxy emulsion according to claim 1, characterized in that the method for preparing the nonionic emulsifier comprises the following steps:

(1) mixing epoxy resin E-20, epoxy resin E-51, polyethylene glycol 6000 and propylene glycol methyl ether acetate, heating, heating to 60-80 ° C to keep warm until the material is completely melted;

{2) After the temperature is maintained for 0.8-2 hours after melting, boron trifluoride etherate is added dropwise, and the reaction is terminated after further 1-2 hours of incubation to obtain a nonionic emulsifier.

[Claim 3] An epoxy emulsion according to claim 1, characterized in that the preparation method of the anionic emulsifier comprises the following steps: (1) p-aminobenzoic acid and a half amount of propylene glycol methyl ether acetate The ester is mixed and heated to 50-60 ° C;

(2) After dropping butyl glycidyl ether, it is kept for 0.5-lh;

(3) Warm up to 70-80. C, adding boron trifluoride etherate, stirring, the liquid is transparent and reacting for 1- 2h _;

(4) After maintaining the temperature at 70-80 ° C, the epoxy resin E-51 is dissolved in the other half of the propylene glycol methyl ether acetate, and then added to the liquid system obtained in the step (3), stirred, and transparent. Reaction l-2h;

(5) Add dimethylethanolamine and deionized water at 70-80 ° C, and mix well to obtain an anionic emulsifier.

[Claim 4] An epoxy emulsion according to claim 1, wherein the co-solvent is ethylene glycol butyl ether.

[Claim 5] The method for preparing an epoxy emulsion according to claim 1, comprising the following steps:

The solid epoxy resin and the cosolvent are placed in an emulsification kettle, heated and melted at 90-115 ° C, and then a nonionic emulsifier and an anionic emulsifier are added. After stirring uniformly, hot water is added at 85-95 ° C to a solid content of 50. An epoxy emulsion was obtained at -55 wt%.