阅读说明：本技术 一种绝缘、耐电压水性环氧胶及其制备方法 (Insulating and voltage-resistant waterborne epoxy adhesive and preparation method thereof ) 是由 邓华强 何志钧 朱行春 于 2021-10-22 设计创作，主要内容包括：本发明涉及水性环氧胶技术领域,尤其涉及一种绝缘、耐电压水性环氧胶及其制备方法。水性环氧胶由组分一、组分二和蒸馏水按照60:10:30的比例混合、固化形成；组分一包括水性环氧树脂乳液30-70％、粉体半成品40-80％、助剂1-10％、色浆1-5％和蒸馏水20-50％；组分二为改性铵水性环氧固化剂。本发明所用材料为水性制作技术,具有VOC含量低的特点,满足环保要求。功能性强,满足阻燃、耐磨、绝缘、耐电压等测试要求。组分一、组分二现用现混,混合后有3-4小时的使用时间,满足施工要求,同时也保证其工作性能。(The invention relates to the technical field of aqueous epoxy glue, in particular to insulating and voltage-resistant aqueous epoxy glue and a preparation method thereof. The water-based epoxy adhesive is formed by mixing and curing a component I, a component II and distilled water according to the proportion of 60:10: 30; the components comprise 30-70% of aqueous epoxy resin emulsion, 40-80% of powder semi-finished product, 1-10% of auxiliary agent, 1-5% of color paste and 20-50% of distilled water; the second component is modified ammonium water-based epoxy curing agent. The material used in the invention is a water-based manufacturing technology, has the characteristic of low VOC content, and meets the requirement of environmental protection. The functionality is strong, and the test requirements of flame retardance, wear resistance, insulation, voltage resistance and the like are met. The component I and the component II are mixed at present, and the service time is 3-4 hours after mixing, so that the construction requirement is met, and the working performance is ensured.)

1. An insulating voltage-resistant waterborne epoxy adhesive is characterized by being formed by mixing and curing a component I, a component II and distilled water according to a ratio of 60:10: 30; the components comprise 30-70% of aqueous epoxy resin emulsion, 40-80% of powder semi-finished product, 1-10% of auxiliary agent, 1-5% of color paste and 20-50% of distilled water; the second component is modified ammonium water-based epoxy curing agent.

2. The insulating and voltage-resistant waterborne epoxy glue of claim 1, wherein the waterborne epoxy resin emulsion is prepared by emulsifying solid epoxy resin, propylene glycol methyl ether, a solid emulsifier and distilled water; the solid epoxy resin is bisphenol A glycidyl ether novolac epoxy resin, and the epoxy equivalent is 180-190.

3. The insulating and voltage-resistant waterborne epoxy glue of claim 2, wherein each part of the waterborne epoxy resin emulsion comprises 196 parts of solid epoxy resin, 32 parts of propylene glycol methyl ether, 24 parts of solid emulsifier and 148 parts of distilled water, and the preparation process comprises: adding solid epoxy resin, propylene glycol methyl ether and a solid emulsifier into a flask, and preserving at the temperature of below 130 ℃ until the solid epoxy resin, the propylene glycol methyl ether and the solid emulsifier are completely dissolved; putting the completely dissolved materials into a constant temperature bath at 60 ℃ for cooling, and simultaneously dispersing at high speed at 1500 RPM; slowly dripping distilled water according to the process of finishing dripping within 3 hours, adjusting the dispersion rotating speed according to the viscosity rise in the dripping process, stopping dripping until the phase transition point, and maintaining the same rotating speed for dispersing for 1 hour; reducing the dispersion rotation speed, adding the residual distilled water within 45 minutes, and uniformly stirring; cooling to normal temperature for storage.

4. The insulating voltage-resistant waterborne epoxy glue of claim 3, wherein the raw materials for preparing the powder semi-finished product comprise a waterborne epoxy resin emulsion, propylene glycol methyl ether, nano-grade mica powder, nano-grade glass beads, hydrophilic silica powder, nano-grade calcium and a dispersant; the powder needs to be subjected to surface treatment before use.

5. The insulating and voltage-resistant waterborne epoxy glue of claim 4, wherein each part of the semi-finished powder comprises 55 parts of waterborne epoxy resin emulsion, 6.8 parts of propylene glycol methyl ether, 12 parts of nano-mica powder, 5 parts of nano-glass beads, 0.1 part of hydrophilic silica powder, 21 parts of nano-calcium and 0.1 part of dispersant, and the preparation process comprises: adding 30% of waterborne epoxy resin emulsion into a stirring tank, adding a dispersing agent and propylene glycol methyl ether under the stirring state of 300r/min, and dispersing for 5-10 min; adding hydrophilic silicon dioxide powder, nano calcium and nano-grade glass beads at the speed of 300r/min, and then stirring for 10-20min at the speed of 500 r/min; adding the nano mica powder and the rest aqueous epoxy resin emulsion at the state of 300r/min, and then stirring at the speed of 300r/min for 10-20 min.

6. The insulating voltage-resistant waterborne epoxy glue of claim 5, wherein in the preparation process of the powder semi-finished product, circulating cooling water is started in the whole process, and the temperature is controlled not to exceed 40 ℃.

7. The insulating and voltage-resistant waterborne epoxy glue of claim 1, wherein the auxiliaries comprise a pH adjusting aid, a flame retardant, a thickener, a waterborne defoamer and an adhesion promoter; wherein the aqueous defoamer is TEGO Foamex 825; the pH adjusting auxiliary agent is AMP-95 of Dow chemistry; the adhesion promoter is a siloxane coupling agent; the flame retardant is in a phosphorus-nitrogen liquid type; the thickening agent is a nonionic hydrophobic modified polyurethane rheological thickening agent.

8. The insulating and voltage-resistant waterborne epoxy glue of claim 1, wherein the color paste is a high-temperature-resistant inorganic pigment, and is ground and surface-treated with emulsion before use, and the fineness is nanometer level.

9. A preparation method of insulating and voltage-resistant waterborne epoxy glue is characterized by comprising the following steps:

s1, adding the aqueous epoxy resin emulsion into a stirring tank, adding the powder semi-finished product and the color paste under the stirring state of 300r/min, and dispersing for 10-20 min;

s2, adding a flame retardant and a thickening agent at the state of 300r/min, and then stirring and dispersing at 500r/min for 5-10 min;

s3, standing the mixed liquid for 120min at normal temperature, sequentially adding an adhesion promoter, a water-based defoaming agent and a pH adjusting aid under a stirring state of 300r/min, and then stirring and dispersing for 20-30min at 500r/min to prepare a component I; starting circulating cooling water in the whole process, and controlling the temperature not to exceed 40 ℃;

s4, the component I, the component II and deionized water are mixed at present according to the proportion of 60:10:30, stirred evenly and filtered by a 200-mesh sieve.

10. An insulating and voltage-resistant aqueous epoxy adhesive is applied to galvanized iron with a surface treated by a brush, and is baked at 80 ℃ for 1H and then at 130 ℃ for 6H.

Technical Field

The invention relates to the technical field of aqueous epoxy glue, in particular to insulating and voltage-resistant aqueous epoxy glue and a preparation method thereof.

Background

The epoxy resin adhesive has many unique advantages of high insulation, large structural strength, good sealing performance and the like, is widely applied to insulation and packaging of high and low voltage electric appliances, motors and electronic components, and is developed quickly. The pouring method is mainly used for pouring insulating packaging parts of electric appliances and motors. The manufacture of integral fully-sealed insulating package parts of high-voltage and low-voltage electric appliances such as electromagnets, contactor coils, mutual inductors, dry-type transformers and the like. The rapid development in the electrical industry has progressed from atmospheric casting, vacuum casting to automatic pressure gel forming. Because of its superior performance, it has a great tendency to replace the traditional metal, ceramic and glass packaging. Epoxy laminated plastics are widely used in the fields of electronics and electrical appliances. Among them, the development of epoxy copper clad laminate is particularly rapid, and has become one of the basic materials in the electronic industry.

Along with the development of society, the protection consciousness of human beings on the living environment is continuously improved, for the electronic industry, the requirements and restriction conditions in the aspects of sanitation, environmental protection, labor protection and the like are gradually increased, and the green production consciousness of people is further strengthened. Particularly, suppliers of western countries such as the united states, japan and the european union have clearly proposed a demand for using an environment-friendly insulating paste to suppliers. Therefore, efforts to develop and apply environmentally friendly aqueous insulating adhesives are underway. The water-based epoxy adhesive is a project developed based on the oily epoxy adhesive and meeting the requirement on environmental protection. However, the existing water-based epoxy glue has the problems of insufficient voltage resistance, abrasion resistance, heat resistance, corrosion resistance, poor adhesion and the like.

Disclosure of Invention

Aiming at the problems in the background technology, an insulating and voltage-resistant waterborne epoxy adhesive and a preparation method thereof are provided. The material used in the invention is a water-based manufacturing technology, has the characteristic of low VOC content, and meets the requirement of environmental protection. The functionality is strong, and the test requirements of flame retardance, wear resistance, insulation, voltage resistance and the like are met. The component I and the component II are mixed at present, and the service time is 3-4 hours after mixing, so that the construction requirement is met, and the working performance is ensured.

The invention provides an insulating and voltage-resistant waterborne epoxy adhesive which is formed by mixing and curing a component I, a component II and distilled water according to the proportion of 60:10: 30; the components comprise 30-70% of aqueous epoxy resin emulsion, 40-80% of powder semi-finished product, 1-10% of auxiliary agent, 1-5% of color paste and 20-50% of distilled water; the second component is modified ammonium water-based epoxy curing agent.

Preferably, the aqueous epoxy resin emulsion is prepared by emulsifying solid epoxy resin, propylene glycol methyl ether, a solid emulsifier and distilled water; the solid epoxy resin is bisphenol A glycidyl ether novolac epoxy resin, and the epoxy equivalent is 180-190.

Preferably, each part of the aqueous epoxy resin emulsion comprises 196 parts of solid epoxy resin, 32 parts of propylene glycol methyl ether, 24 parts of solid emulsifier and 148 parts of distilled water, and the preparation process comprises the following steps: adding solid epoxy resin, propylene glycol methyl ether and a solid emulsifier into a flask, and preserving at the temperature of below 130 ℃ until the solid epoxy resin, the propylene glycol methyl ether and the solid emulsifier are completely dissolved; putting the completely dissolved materials into a constant temperature bath at 60 ℃ for cooling, and simultaneously dispersing at high speed at 1500 RPM; slowly dripping distilled water according to the process of finishing dripping within 3 hours, adjusting the dispersion rotating speed according to the viscosity rise in the dripping process, stopping dripping until the phase transition point, and maintaining the same rotating speed for dispersing for 1 hour; reducing the dispersion rotating speed and ensuring full mixing. Adding the rest distilled water within 45 minutes, and uniformly stirring; cooling to normal temperature for storage.

Preferably, the raw materials for preparing the powder semi-finished product comprise aqueous epoxy resin emulsion, propylene glycol methyl ether, nano-grade mica powder, nano-grade glass beads, hydrophilic silicon dioxide powder, nano-grade calcium and a dispersing agent; the powder needs to be subjected to surface treatment before use.

Preferably, each part of the raw materials for preparing the semi-finished powder comprise 55 parts of waterborne epoxy resin emulsion, 6.8 parts of propylene glycol methyl ether, 12 parts of nano-mica powder, 5 parts of nano-glass beads, 0.1 part of hydrophilic silicon dioxide powder, 21 parts of nano-calcium and 0.1 part of dispersant, and the preparation process comprises the following steps: adding 30% of waterborne epoxy resin emulsion into a stirring tank, adding a dispersing agent and propylene glycol methyl ether under the stirring state of 300r/min, and dispersing for 5-10 min; adding hydrophilic silicon dioxide powder, nano calcium and nano-grade glass beads at the speed of 300r/min, and then stirring for 10-20min at the speed of 500 r/min; adding the nano mica powder and the rest aqueous epoxy resin emulsion at the state of 300r/min, and then stirring at the speed of 300r/min for 10-20 min.

Preferably, in the preparation process of the powder semi-finished product, circulating cooling water is started in the whole process, and the temperature is controlled not to exceed 40 ℃.

Preferably, the auxiliary agent comprises a pH adjusting auxiliary agent, a flame retardant, a thickening agent, a water-based defoaming agent and an adhesion promoter; wherein the aqueous defoamer is TEGO Foamex 825; the pH adjusting auxiliary agent is AMP-95 of Dow chemistry; the adhesion promoter is a siloxane coupling agent; the flame retardant is in a phosphorus-nitrogen liquid type; the thickening agent is a nonionic hydrophobic modified polyurethane rheological thickening agent.

Preferably, the color paste is high-temperature-resistant inorganic pigment, and is ground and subjected to surface treatment by using emulsion before use, wherein the fineness is in a nanometer level.

The invention provides a preparation method of insulating and voltage-resistant waterborne epoxy glue, which comprises the following steps:

s1, adding the aqueous epoxy resin emulsion into a stirring tank, adding the powder semi-finished product and the color paste under the stirring state of 300r/min, and dispersing for 10-20 min;

s2, adding a flame retardant and a thickening agent at the state of 300r/min, and then stirring and dispersing at 500r/min for 5-10 min;

s3, standing the mixed liquid for 120min at normal temperature, sequentially adding an adhesion promoter, a water-based defoaming agent and a pH adjusting aid under a stirring state of 300r/min, and then stirring and dispersing for 20-30min at 500r/min to prepare a component I; starting circulating cooling water in the whole process, and controlling the temperature not to exceed 40 ℃;

s4, the component I, the component II and deionized water are mixed at present according to the proportion of 60:10:30, stirred evenly and filtered by a 200-mesh sieve.

The invention provides an application of insulating and voltage-resistant waterborne epoxy glue, which is characterized in that the insulating and voltage-resistant waterborne epoxy glue is coated on galvanized iron with surface treatment by a brush, and is baked at 80 ℃ for multiplied by 1H and then baked at 130 ℃ for multiplied by 6H.

Compared with the prior art, the invention has the following beneficial technical effects:

the material used in the invention is a water-based manufacturing technology, has the characteristic of low VOC content, and meets the requirement of environmental protection. The functionality is strong, and the test requirements of flame retardance, wear resistance, insulation, voltage resistance and the like are met. The component I and the component II are mixed at present, and the service time is 3-4 hours after mixing, so that the construction requirement is met, and the working performance is ensured.

Detailed Description

Example one

The invention provides an insulating and voltage-resistant waterborne epoxy adhesive which is formed by mixing and curing a component I, a component II and distilled water according to the proportion of 60:10: 30; the components comprise 30-70% of aqueous epoxy resin emulsion, 40-80% of powder semi-finished product, 1-10% of auxiliary agent, 1-5% of color paste and 20-50% of distilled water; the second component is modified ammonium water-based epoxy curing agent.

Further, the water-based epoxy resin emulsion is formed by emulsifying solid epoxy resin, propylene glycol methyl ether, a solid emulsifier and distilled water; the solid epoxy resin is bisphenol A glycidyl ether novolac epoxy resin, and the epoxy equivalent is 180-190.

Further, the raw materials for preparing the powder semi-finished product comprise aqueous epoxy resin emulsion, propylene glycol methyl ether, nano-grade mica powder, nano-grade glass beads, hydrophilic silicon dioxide powder, nano-grade calcium and a dispersing agent; the powder needs to be subjected to surface treatment before use.

Further, the auxiliary agent comprises a pH adjusting auxiliary agent, a flame retardant, a thickening agent, a water-based defoaming agent and an adhesion promoter; wherein the aqueous defoamer is TEGO Foamex 825; the pH adjusting auxiliary agent is AMP-95 of Dow chemistry; the adhesion promoter is a siloxane coupling agent; the flame retardant is in a phosphorus-nitrogen liquid type; the thickening agent is a nonionic hydrophobic modified polyurethane rheological thickening agent.

Further, the color paste is a high-temperature-resistant inorganic pigment, and is ground and subjected to surface treatment by using emulsion before use, wherein the fineness is in a nanometer level.

Example two

In this embodiment, each part of the aqueous epoxy resin emulsion includes 196 parts of a solid epoxy resin, 32 parts of propylene glycol methyl ether, 24 parts of a solid emulsifier, and 148 parts of distilled water, and the preparation process includes: adding solid epoxy resin, propylene glycol methyl ether and a solid emulsifier into a flask, and preserving at the temperature of below 130 ℃ until the solid epoxy resin, the propylene glycol methyl ether and the solid emulsifier are completely dissolved; putting the completely dissolved materials into a constant temperature bath at 60 ℃ for cooling, and simultaneously dispersing at high speed at 1500 RPM; slowly dripping distilled water according to the process of finishing dripping within 3 hours, adjusting the dispersion rotating speed according to the viscosity rise in the dripping process, stopping dripping until the phase transition point, and maintaining the same rotating speed for dispersing for 1 hour; reducing the dispersion rotating speed and ensuring full mixing. Adding the rest distilled water within 45 minutes, and uniformly stirring; cooling to normal temperature for storage.

EXAMPLE III

In this embodiment, each part of the raw materials for preparing the powder semi-finished product includes 55 parts of aqueous epoxy resin emulsion, 6.8 parts of propylene glycol methyl ether, 12 parts of nano-mica powder, 5 parts of nano-glass beads, 0.1 part of hydrophilic silica powder, 21 parts of nano-calcium, and 0.1 part of dispersant, and the preparation process includes: adding 30% of waterborne epoxy resin emulsion into a stirring tank, adding a dispersing agent and propylene glycol methyl ether under the stirring state of 300r/min, and dispersing for 5-10 min; adding hydrophilic silicon dioxide powder, nano calcium and nano-grade glass beads at the speed of 300r/min, and then stirring for 10-20min at the speed of 500 r/min; adding the nano mica powder and the rest aqueous epoxy resin emulsion at the state of 300r/min, and then stirring at the speed of 300r/min for 10-20 min. In the preparation process of the powder semi-finished product, circulating cooling water is started in the whole process, and the temperature is controlled to be not more than 40 ℃.

Example four

The invention provides a preparation method of insulating and voltage-resistant waterborne epoxy glue, which comprises the following steps:

s1, adding the aqueous epoxy resin emulsion into a stirring tank, adding the powder semi-finished product and the color paste under the stirring state of 300r/min, and dispersing for 10-20 min;

s2, adding a flame retardant and a thickening agent at the state of 300r/min, and then stirring and dispersing at 500r/min for 5-10 min;

s3, standing the mixed liquid for 120min at normal temperature, sequentially adding an adhesion promoter, a water-based defoaming agent and a pH adjusting aid under a stirring state of 300r/min, and then stirring and dispersing for 20-30min at 500r/min to prepare a component I; starting circulating cooling water in the whole process, and controlling the temperature not to exceed 40 ℃;

s4, the component I, the component II and deionized water are mixed at present according to the proportion of 60:10:30, stirred evenly and filtered by a 200-mesh sieve.

Example four

The invention provides an application of insulating and voltage-resistant waterborne epoxy glue, which is characterized in that the insulating and voltage-resistant waterborne epoxy glue is coated on galvanized iron with surface treatment by a brush, and is baked at 80 ℃ for multiplied by 1H and then baked at 130 ℃ for multiplied by 6H.

The epoxy value of the finished product prepared by the invention is 0.3-0.35; the solid content is 50 percent; the viscosity (cps @25 ℃ C.) is 5000-. The results of the practical application of the properties of the cured coating film are shown in Table 1:

TABLE 1

The material used in the invention is a water-based manufacturing technology, has the characteristic of low VOC content, and meets the requirement of environmental protection. The functionality is strong, and the test requirements of flame retardance, wear resistance, insulation, voltage resistance and the like are met. The component I and the component II are mixed at present, and the service time is 3-4 hours after mixing, so that the construction requirement is met, and the working performance is ensured.

While the embodiments of the present invention have been described in detail, the present invention is not limited thereto, and various changes can be made without departing from the gist of the present invention within the knowledge of those skilled in the art.