阅读说明：本技术 一种用于ntc热敏电阻温度报警器的水性防护涂层及其制备方法 (Water-based protective coating for NTC thermistor temperature alarm and preparation method thereof ) 是由 赵丽 宋小利 曹喜贺 于 2021-08-26 设计创作，主要内容包括：本发明涉及一种用于NTC热敏电阻温度报警器的水性防护涂层及其制备方法,其包括如下按重量百分比配比的原料：去离子水5.05-19.38％、分散剂0.5-1.0％、第一消泡剂0.1-0.2％、第二消泡剂0.12-0.25％、流平剂0.3-0.6％、杀菌剂0.1-0.2％、基材润湿剂0.15-0.55％、抗闪锈剂0.5-1.5％、pH调节剂0.1-0.4％、第一类增稠剂0.3-0.55％、第二类增稠剂0.15-0.25％、炭黑2.0-3.5％、改性三聚磷酸铝8.0-12.0％、无锌环保型防锈颜料4.0-9.0％、水性改性环氧树脂45-65％、成膜助剂2.1-4.2％、偶联剂2.5-3.5％。本发明具有薄涂、耐酸蚀、高浓度盐水、耐腐蚀等的优点,且能够兼顾环保要求。(The invention relates to a water-based protective coating for an NTC thermistor temperature alarm and a preparation method thereof, wherein the water-based protective coating comprises the following raw materials in percentage by weight: 5.05 to 19.38 percent of deionized water, 0.5 to 1.0 percent of dispersant, 0.1 to 0.2 percent of first defoaming agent, 0.12 to 0.25 percent of second defoaming agent, 0.3 to 0.6 percent of flatting agent, 0.1 to 0.2 percent of bactericide, 0.15 to 0.55 percent of base material wetting agent, 0.5 to 1.5 percent of flash rust inhibitor, 0.1 to 0.4 percent of pH regulator, 0.3 to 0.55 percent of first thickening agent, 0.15 to 0.25 percent of second thickening agent, 2.0 to 3.5 percent of carbon black, 8.0 to 12.0 percent of modified aluminum tripolyphosphate, 4.0 to 9.0 percent of zinc-free environment-friendly antirust pigment, 45 to 65 percent of water-based modified epoxy resin, 2.1 to 4.2 percent of film-forming additive and 2.5 to 3.5 percent of coupling agent. The invention has the advantages of thin coating, acid corrosion resistance, high-concentration saline water, corrosion resistance and the like, and can meet the requirement of environmental protection.)

1. A waterborne protective coating for an NTC thermistor temperature alarm, characterized in that: comprises the following raw materials in percentage by weight

2. The aqueous protective coating for an NTC thermistor temperature alarm of claim 1, characterized in that: the water-based protective coating comprises the following raw materials in percentage by weight

3. The aqueous protective coating for an NTC thermistor temperature alarm of claim 1, characterized in that: the water-based protective coating comprises the following raw materials in percentage by weight

4. The aqueous protective coating for an NTC thermistor temperature alarm of claim 1, characterized in that: the water-based protective coating comprises the following raw materials in percentage by weight

5. The aqueous protective coating for an NTC thermistor temperature alarm of claim 1, characterized in that: the waterborne modified epoxy resin is self-emulsifying single-component modified epoxy resin, does not need to be matched with a curing agent, and can be self-crosslinked to form a film.

6. The aqueous protective coating for an NTC thermistor temperature alarm of claim 1, characterized in that: the first defoaming agent is a modified organic silicon defoaming agent, and the second defoaming agent is a modified polysiloxane defoaming agent.

7. The aqueous protective coating for an NTC thermistor temperature alarm of claim 1, characterized in that: the first thickening agent is a nonionic polyurethane thickening agent, and the second thickening agent is an alkali swelling thickening agent.

8. The aqueous protective coating for an NTC thermistor temperature alarm of claim 1, characterized in that: the coupling agent is poly (glycidoxypropyltrimethoxysilane).

9. A method of preparing an aqueous protective coating for an NTC thermistor temperature alarm according to any of claims 1 to 8, characterized in that: the method comprises the following steps:

(1) slowly adding deionized water in the formula into a mixing tank according to the proportion, adding a dispersing agent, a flatting agent, a first defoaming agent, a base material wetting agent and a pH regulator under the stirring state of 300r/min, and stirring the bactericide at the speed of 500-800r/min for dispersing for 10-30 min;

(2) slowing down, slowly adding carbon black, modified aluminum phosphate and zinc-free environment-friendly anti-rust pigment under the stirring state of 300r/min, slowly adding a first thickening agent after the substances are completely soaked, gradually increasing the speed to 1000r/min, stirring for 25-35min, sealing and soaking for 4h, transferring the mixture to a horizontal sand mill for grinding, starting circulating cooling water, controlling the grinding temperature to be not more than 40 ℃, measuring by using a scraper blade fineness meter until the fineness reaches 15-20 mu m, and discharging grinding slurry to a paint mixing tank;

(3) slowly adding the water-based modified epoxy resin, the film forming auxiliary agent, the second type defoaming agent, the leveling agent, the flash rust resisting agent and the coupling agent into a paint mixing tank under the stirring of 300r/min, accelerating to 500r/min, dispersing for 15-30min, then adjusting the viscosity to 70-90ku by using deionized water and the second type thickening agent, filtering by using 200-mesh filter cloth, and packaging to obtain the water-based protective coating.

Technical Field

The invention relates to the technical field of coatings, in particular to a water-based protective coating for an NTC thermistor temperature alarm and a preparation method thereof.

Background

NTC is an abbreviation of Negative Temperature Coefficient, which means Negative Temperature Coefficient, and generally refers to semiconductor material or component with large Negative Temperature Coefficient, so called NTC thermistor is a Negative Temperature Coefficient thermistor. The material is a semiconductor ceramic formed by fully mixing, molding, sintering and other processes of two or more metal oxides of manganese, copper, silicon, cobalt, iron, nickel, zinc and the like, and a thermistor is required to play stable temperature control and temperature measurement functions under ultrahigh temperature, ultrahigh pressure and other severe conditions by many high-tech electronic products at present,

the alarm is based on the principle that a nickel alloy material contact is welded by a special material to form a welding spot, the welding spot is in a power-off state in a normal state, when the temperature reaches 46 ℃, the welding spot is melted, the nickel alloy material is connected at the moment, the power is turned on, and the alarm is started, so that the early warning effect is achieved. The device is generally used in the fields with severe environment and strong corrosivity, the service life of the alarm is easily influenced due to corrosion, rusting and the like, so that the alarm is particularly important to take protective measures, but the currently used protective coating is basically solvent-based paint which contains a large amount of VOC (volatile organic compounds) and pollutes the atmosphere; meanwhile, the paint also contains a large amount of benzene series, which causes great harm to the physical and psychological health of coating workers, and under the background, the development of the environment-friendly paint which meets the technical requirements, has low VOC and does not contain the benzene series is imperative.

Disclosure of Invention

The invention aims to provide a water-based protective coating for an NTC thermistor temperature alarm and a preparation method thereof.

The above object of the present invention is achieved by the following technical solutions:

a water-based protective coating for an NTC thermistor temperature alarm comprises the following raw materials in percentage by weight

The invention is further configured to: the water-based protective coating comprises the following raw materials in percentage by weight

The invention is further configured to: the water-based protective coating comprises the following raw materials in percentage by weight

The invention is further configured to: the water-based protective coating comprises the following raw materials in percentage by weight

By adopting the technical scheme, the selected modified aluminum tripolyphosphate and the zinc-free environment-friendly antirust pigment synergistically solve the antirust problem, and meanwhile, the antirust pigment does not contain heavy metals, so that the antirust pigment is more environment-friendly and scientific.

The invention is further configured to: the waterborne modified epoxy resin is self-emulsifying single-component modified epoxy resin, does not need to be matched with a curing agent, and can be self-crosslinked to form a film.

By adopting the technical scheme, the paint is diluted by tap water, is convenient and quick to construct, greatly reduces the discharge of VOC (volatile organic compounds), and can form a compact coating film through self-crosslinking.

The invention is further configured to: the first defoaming agent is a modified organic silicon defoaming agent, and the second defoaming agent is a modified polysiloxane defoaming agent.

The invention is further configured to: the first thickening agent is a nonionic polyurethane thickening agent, and the second thickening agent is an alkali swelling thickening agent.

By adopting the technical scheme, the problem of thickening of the solvent behind the modified epoxy resin is well solved, the good storage stability of the system is ensured, and meanwhile, the anti-sagging property of construction is solved.

The invention is further configured to: the coupling agent is poly (glycidoxypropyltrimethoxysilane).

By adopting the technical scheme, the waterborne modification is carried out, so that the compactness of the coating can be effectively improved, the corrosion resistance and the water resistance of the paint film are further improved, and the adhesive force of the epoxy coating on the nickel alloy is improved through a covalent bond.

A preparation method of a water-based protective coating for an NTC thermistor temperature alarm comprises the following steps:

(1) slowly adding deionized water in the formula into a mixing tank according to the proportion, adding a dispersing agent, a flatting agent, a first defoaming agent, a base material wetting agent and a pH regulator under the stirring state of 300r/min, and stirring the bactericide at the speed of 500-800r/min for dispersing for 10-30 min;

(2) slowing down, slowly adding carbon black, modified aluminum phosphate and zinc-free environment-friendly anti-rust pigment under the stirring state of 300r/min, slowly adding a first thickening agent after the substances are completely soaked, gradually increasing the speed to 1000r/min, stirring for 25-35min, sealing and soaking for 4h, transferring the mixture to a horizontal sand mill for grinding, starting circulating cooling water, controlling the grinding temperature to be not more than 40 ℃, measuring by using a scraper blade fineness meter until the fineness reaches 15-20 mu m, and discharging grinding slurry to a paint mixing tank;

(3) slowly adding the water-based modified epoxy resin, the film forming auxiliary agent, the second type defoaming agent, the leveling agent, the flash rust resisting agent and the coupling agent into a paint mixing tank under the stirring of 300r/min, accelerating to 500r/min, dispersing for 15-30min, then adjusting the viscosity to 70-90ku by using deionized water and the second type thickening agent, filtering by using 200-mesh filter cloth, and packaging to obtain the water-based protective coating.

By adopting the technical scheme, the thickness of the aqueous protective coating is controlled to be 22-36 um.

In conclusion, the beneficial technical effects of the invention are as follows:

the invention has the advantages of thin coating, acid corrosion resistance, high-concentration saline water and corrosion resistance, does not contain foaming organic matters, can meet the requirement of environmental protection, can ensure that the normal use of the alarm system is not influenced before and after corrosion, can meet the stability of a paint film in a soaking state of the high-concentration saline water (the saline water with the concentration of 20 percent), can meet the performance of the paint film under the condition of thin coating (22-36um), can meet the temperature property of the paint film under an acidic state, and can not exceed 46 ℃ of the curing temperature of the paint film, thereby ensuring that welding spots of the alarm system are intact, and the antirust pigment has no heavy metal and is more environment-friendly.

Detailed Description

The invention discloses a water-based protective coating for an NTC thermistor temperature alarm, which comprises the following raw materials in percentage by weight

The waterborne modified epoxy resin is self-emulsifying single-component modified epoxy resin, does not need to be matched with a curing agent, and can be self-crosslinked to form a film.

The first defoaming agent is a modified organic silicon defoaming agent, and the second defoaming agent is a modified polysiloxane defoaming agent.

The first thickening agent is a nonionic polyurethane thickening agent, and the second thickening agent is an alkali swelling thickening agent.

The coupling agent is poly (glycidoxypropyltrimethoxysilane).

A preparation method of a water-based protective coating for an NTC thermistor temperature alarm comprises the following steps:

(1) slowly adding deionized water in the formula into a mixing tank according to the proportion, adding a dispersing agent, a flatting agent, a first defoaming agent, a base material wetting agent and a pH regulator under the stirring state of 300r/min, and stirring the bactericide at the speed of 500-800r/min for dispersing for 10-30 min;

(2) slowing down, slowly adding carbon black, modified aluminum phosphate and zinc-free environment-friendly anti-rust pigment under the stirring state of 300r/min, slowly adding a first thickening agent after the substances are completely soaked, gradually increasing the speed to 1000r/min, stirring for 25-35min, sealing and soaking for 4h, transferring the mixture to a horizontal sand mill for grinding, starting circulating cooling water, controlling the grinding temperature to be not more than 40 ℃, measuring by using a scraper blade fineness meter until the fineness reaches 15-20 mu m, and discharging grinding slurry to a paint mixing tank;

(3) slowly adding the water-based modified epoxy resin, the film forming auxiliary agent, the second type defoaming agent, the leveling agent, the flash rust resisting agent and the coupling agent into a paint mixing tank under the stirring of 300r/min, accelerating to 500r/min, dispersing for 15-30min, then adjusting the viscosity to 70-90ku by using deionized water and the second type thickening agent, filtering by using 200-mesh filter cloth, and packaging to obtain the water-based protective coating.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, several embodiments accompanied with a method for preparing an aqueous protective coating for an NTC thermistor temperature alarm according to the present invention are described below.

Example 1

The invention discloses a water-based protective coating for an NTC thermistor temperature alarm, which comprises the following raw materials in percentage by weight: 10% of deionized water, 0.8% of dispersing agent, 0.15% of first defoaming agent, 0.21% of second defoaming agent, 0.45% of flatting agent, 0.15% of bactericide, 0.35% of base material wetting agent, 1.0% of flash rust resisting agent, 0.25% of pH regulator, 0.45% of first thickening agent, 0.2% of second thickening agent, 2.8% of carbon black, 10.0% of modified aluminum tripolyphosphate, 7.0% of zinc-free environment-friendly antirust pigment and 55% of water-based modified epoxy resin; 3.1 percent of film forming additive and 3.0 percent of coupling agent.

The waterborne modified epoxy resin is self-emulsifying single-component modified epoxy resin, does not need to be matched with a curing agent, and can be self-crosslinked to form a film.

The first defoaming agent is a modified organic silicon defoaming agent, and the second defoaming agent is a modified polysiloxane defoaming agent.

The first thickening agent is a nonionic polyurethane thickening agent, and the second thickening agent is an alkali swelling thickening agent.

The coupling agent is poly (glycidoxypropyltrimethoxysilane).

A preparation method of a water-based protective coating for an NTC thermistor temperature alarm comprises the following steps:

(1) slowly adding deionized water in the formula into a mixing tank according to the proportion, adding a dispersing agent, a flatting agent, a first defoaming agent, a base material wetting agent and a pH regulator under the stirring state of 300r/min, and stirring the bactericide at the speed of 500-800r/min for dispersing for 10-30 min;

(2) slowing down, slowly adding carbon black, modified aluminum phosphate and zinc-free environment-friendly anti-rust pigment under the stirring state of 300r/min, slowly adding a first thickening agent after the substances are completely soaked, gradually increasing the speed to 1000r/min, stirring for 25-35min, sealing and soaking for 4h, transferring the mixture to a horizontal sand mill for grinding, starting circulating cooling water, controlling the grinding temperature to be not more than 40 ℃, measuring by using a scraper blade fineness meter until the fineness reaches 15-20 mu m, and discharging grinding slurry to a paint mixing tank;

(3) slowly adding the water-based modified epoxy resin, the film forming auxiliary agent, the second type defoaming agent, the leveling agent, the flash rust resisting agent and the coupling agent into a paint mixing tank under the stirring of 300r/min, accelerating to 500r/min, dispersing for 15-30min, then adjusting the viscosity to 70-90ku by using deionized water and the second type thickening agent, filtering by using 200-mesh filter cloth, and packaging to obtain the water-based protective coating.

Example 2

The invention discloses a water-based protective coating for an NTC thermistor temperature alarm, which comprises the following raw materials in percentage by weight: 5.05% of deionized water, 0.5% of dispersing agent, 0.1% of first defoaming agent, 0.12% of second defoaming agent, 0.3% of flatting agent, 0.1% of bactericide, 0.15% of base material wetting agent, 0.5% of flash rust resisting agent, 0.1% of pH regulator, 0.3% of first thickening agent, 0.15% of second thickening agent, 2.0% of carbon black, 8.0% of modified aluminum tripolyphosphate, 4.0% of zinc-free environment-friendly anti-rust pigment and 45% of aqueous modified epoxy resin; 2.1 percent of film-forming additive and 2.5 percent of coupling agent.

The waterborne modified epoxy resin is self-emulsifying single-component modified epoxy resin, does not need to be matched with a curing agent, and can be self-crosslinked to form a film.

The first defoaming agent is a modified organic silicon defoaming agent, and the second defoaming agent is a modified polysiloxane defoaming agent.

The first thickening agent is a nonionic polyurethane thickening agent, and the second thickening agent is an alkali swelling thickening agent.

The coupling agent is poly (glycidoxypropyltrimethoxysilane).

A preparation method of a water-based protective coating for an NTC thermistor temperature alarm comprises the following steps:

(1) slowly adding deionized water in the formula into a mixing tank according to the proportion, adding a dispersing agent, a flatting agent, a first defoaming agent, a base material wetting agent and a pH regulator under the stirring state of 300r/min, and stirring the bactericide at the speed of 500-800r/min for dispersing for 10-30 min;

(2) slowing down, slowly adding carbon black, modified aluminum phosphate and zinc-free environment-friendly anti-rust pigment under the stirring state of 300r/min, slowly adding a first thickening agent after the substances are completely soaked, gradually increasing the speed to 1000r/min, stirring for 25-35min, sealing and soaking for 4h, transferring the mixture to a horizontal sand mill for grinding, starting circulating cooling water, controlling the grinding temperature to be not more than 40 ℃, measuring by using a scraper blade fineness meter until the fineness reaches 15-20 mu m, and discharging grinding slurry to a paint mixing tank;

(3) slowly adding the water-based modified epoxy resin, the film forming auxiliary agent, the second type defoaming agent, the leveling agent, the flash rust resisting agent and the coupling agent into a paint mixing tank under the stirring of 300r/min, accelerating to 500r/min, dispersing for 15-30min, then adjusting the viscosity to 70-90ku by using deionized water and the second type thickening agent, filtering by using 200-mesh filter cloth, and packaging to obtain the water-based protective coating.

Example 3

The invention discloses a water-based protective coating for an NTC thermistor temperature alarm, which comprises the following raw materials in percentage by weight: 19.38% of deionized water, 1.0% of dispersing agent, 0.2% of first defoaming agent, 0.25% of second defoaming agent, 0.6% of flatting agent, 0.2% of bactericide, 0.55% of base material wetting agent, 1.5% of flash rust inhibitor, 0.4% of pH regulator, 0.55% of first thickening agent, 0.25% of second thickening agent, 3.5% of carbon black, 12.0% of modified aluminum tripolyphosphate, 9.0% of zinc-free environment-friendly anti-rust pigment and 65% of aqueous modified epoxy resin; 4.2 percent of film-forming additive and 3.5 percent of coupling agent.

The waterborne modified epoxy resin is self-emulsifying single-component modified epoxy resin, does not need to be matched with a curing agent, and can be self-crosslinked to form a film.

The first defoaming agent is a modified organic silicon defoaming agent, and the second defoaming agent is a modified polysiloxane defoaming agent.

The first thickening agent is a nonionic polyurethane thickening agent, and the second thickening agent is an alkali swelling thickening agent.

The coupling agent is poly (glycidoxypropyltrimethoxysilane).

A preparation method of a water-based protective coating for an NTC thermistor temperature alarm comprises the following steps:

(1) slowly adding deionized water in the formula into a mixing tank according to the proportion, adding a dispersing agent, a flatting agent, a first defoaming agent, a base material wetting agent and a pH regulator under the stirring state of 300r/min, and stirring the bactericide at the speed of 500-800r/min for dispersing for 10-30 min;

(2) slowing down, slowly adding carbon black, modified aluminum phosphate and zinc-free environment-friendly anti-rust pigment under the stirring state of 300r/min, slowly adding a first thickening agent after the substances are completely soaked, gradually increasing the speed to 1000r/min, stirring for 25-35min, sealing and soaking for 4h, transferring the mixture to a horizontal sand mill for grinding, starting circulating cooling water, controlling the grinding temperature to be not more than 40 ℃, measuring by using a scraper blade fineness meter until the fineness reaches 15-20 mu m, and discharging grinding slurry to a paint mixing tank;

(3) slowly adding the water-based modified epoxy resin, the film forming auxiliary agent, the second type defoaming agent, the leveling agent, the flash rust resisting agent and the coupling agent into a paint mixing tank under the stirring of 300r/min, accelerating to 500r/min, dispersing for 15-30min, then adjusting the viscosity to 70-90ku by using deionized water and the second type thickening agent, filtering by using 200-mesh filter cloth, and packaging to obtain the water-based protective coating.

Practical application tests prove that the detection results of the embodiments 1 to 3 of the invention are as follows:

the technical scheme in the embodiment of the application at least has the following technical effects or advantages: the invention has the advantages of thin coating, acid corrosion resistance, high-concentration saline water and corrosion resistance, does not contain foaming organic matters, can meet the requirement of environmental protection, can ensure that the normal use of the alarm system is not influenced before and after corrosion, can meet the stability of a paint film in a soaking state of the high-concentration saline water (the saline water with the concentration of 20 percent), can meet the performance of the paint film under the condition of thin coating (22-36um), can meet the temperature property of the paint film under an acidic state, and can not exceed 46 ℃ of the curing temperature of the paint film, thereby ensuring that welding spots of the alarm system are intact, and the antirust pigment has no heavy metal and is more environment-friendly.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.