阅读说明：本技术 一种水性可剥离单变色不可逆示温涂料及其制备方法 (Water-based strippable single-color-change irreversible temperature indicating coating and preparation method thereof ) 是由 田永丰 杨康 孙哲 李建飞 丁渊文 徐润斌 于 2021-06-15 设计创作，主要内容包括：本发明涉及一种水性可剥离单变色不可逆示温涂料,及其制备与使用方法。该涂料包括树脂、变色颜料、填料、助剂、溶剂,其中所述树脂为市售的水性SBS乳液、水性可剥离丙烯酸乳液和水性可剥离PU乳液中的任意一种,树脂的固体份均为50％,所述变色颜料为硬脂酸锌、硬脂酸铅、硬脂酸钙和硬脂酸镉中的任意一种。发明制备的水性可剥离单变色不可逆示温涂料,在变色前,漆膜颜色为白色；变色后,漆膜颜色变透明,具有明显的变色效果。变色速度快,达到指定变色温度立即变色；测温精度高,测温误差为±5℃。测温结束后,易于剥离去除,不影响测温部件的后续表面处理。(The invention relates to a water-based strippable single-discoloration irreversible temperature indicating coating, and a preparation method and a use method thereof. The paint comprises resin, color-changing pigment, filler, auxiliary agent and solvent, wherein the resin is any one of commercially available water-based SBS emulsion, water-based strippable acrylic emulsion and water-based strippable PU emulsion, the solid part of the resin is 50%, and the color-changing pigment is any one of zinc stearate, lead stearate, calcium stearate and cadmium stearate. The water-based strippable single-color-change irreversible thermopaint prepared by the invention has the advantages that before color change, the color of a paint film is white; after the color of the paint film is changed, the paint film becomes transparent and has obvious color changing effect. The color changing speed is high, and the color can be changed immediately when the specified color changing temperature is reached; the temperature measurement precision is high, and the temperature measurement error is +/-5 ℃. After the temperature measurement is finished, the temperature measurement component is easy to strip and remove, and the subsequent surface treatment of the temperature measurement component is not influenced.)

1. The water-based strippable single-color-change irreversible temperature indicating coating is characterized in that: comprises the following components in percentage by mass:

2. the aqueous strippable single-change irreversible thermopaint of claim 1, which is characterized in that: the resin is any one of commercially available water-based SBS emulsion, water-based strippable acrylic emulsion and water-based strippable PU emulsion; the resin was 50% solids.

3. The aqueous strippable single-change irreversible thermopaint of claim 1, which is characterized in that: the filler is one or more of silicon dioxide, talcum powder, quartz powder, kaolin and aluminum oxide.

4. The aqueous strippable single-change irreversible thermopaint of claim 1, which is characterized in that: the color-changing pigment is any one of zinc stearate, lead stearate, calcium stearate and cadmium stearate.

5. The aqueous strippable single-change irreversible thermopaint of claim 1, which is characterized in that: the auxiliary agent is one or more of byk190, byk191, byk192, FA179 and byk 180.

6. The aqueous strippable single-change irreversible thermopaint of claim 1, which is characterized in that: the solvent is deionized water.

7. A method for preparing the water-based strippable single-color irreversible thermopaint of any one of claims 1 to 6, which is characterized in that: the production steps are as follows:

(1) weighing and batching, namely adding a solvent and an auxiliary agent according to the formula amount, stirring at a high speed until the auxiliary agent is completely dissolved, sequentially adding a filler and a color-changing pigment, and stirring while adding materials until the system is uniform and has no agglomeration to obtain a slurry;

(2) grinding and dispersing: feeding the prepared slurry into a sand mill for grinding and dispersing, adding the resin emulsion when the fineness is not more than 30 mu m, stirring at a high speed, controlling the stirring speed at 200-300 r/min, and stirring for 30-60 min to uniformly disperse the components;

(3) discharging: and filtering the dispersed paint liquid by using a 120-mesh screen and canning to obtain the water-based strippable temperature indicating paint.

8. Use of the aqueous strippable single-change irreversible thermopaint of any one of claims 1 to 6, characterized in that: the coating can be coated by brushing or spraying, and the thickness is suitable to be 50-80 mu m; after finishing coating, naturally drying at room temperature for 24 hours to measure the temperature; after the color of the coating is changed, the coating can be easily peeled off manually only by naturally cooling to room temperature.

Technical Field

The invention belongs to the technical field of color-changing coatings, and particularly relates to a water-based strippable single-color-changing irreversible temperature indicating coating and a preparation and use method thereof.

Background

The temperature indicating paint is a paint which indicates the temperature and the temperature distribution of the surface of a measured part by the color change of a coating. According to the reversibility of color change, the method is divided into: reversible temperature indicating paint and irreversible temperature indicating paint; the color of the paint is divided into the following parts according to the number of the color changes along with the temperature: single color-changing temperature indicating paint and multiple color-changing temperature indicating paint. The color change of the temperature indicating paint is realized by utilizing the principles of thermal decomposition, solid-phase reaction, phase change and the like of pigments. The formed product mainly comprises multi-color irreversible thermopaint, single-color reversible thermopaint, thermopaint and the like. The coating is suitable for positions which are not suitable for measurement, such as thermometers, thermocouples, radiation pyrometers and the like, or continuously operating parts and other parts which need large-area temperature distribution measurement. If the device is used for chemical industry, oil refining and the outer wall of a reaction kettle, the overtemperature early warning effect is achieved; the temperature and temperature distribution measuring device is used for measuring the temperature and temperature distribution of aircraft engines, internal instruments and the like.

Most of commercially available single-color irreversible temperature-indicating coatings are oil coatings, which are mainly realized by thermal decomposition and solid-phase reaction of pigments, and the temperature measurement error is usually +/-10 ℃, so that the problem of low temperature measurement precision generally exists. In addition, the conventional single-color-changing irreversible temperature indicating coating can remain on the surface of the measured part after being used, and can be cleaned only by using a paint remover or sand blowing treatment, so that the residues of the coating can not influence the subsequent surface treatment and use of the measured part.

The temperature indicating patch also has the function of the single-color-changing irreversible temperature indicating coating, the temperature measurement is accurate, and the error is +/-5 ℃. During preparation, the color-changing pigment is required to be adhered to the surface of the absorbable material coated with the back glue, and then a layer of transparent plastic film convenient for observation is coated on the color-changing pigment. Therefore, the preparation process is complicated.

Disclosure of Invention

The invention aims to provide a water-based strippable single-color-change irreversible temperature indicating coating and a production and use method thereof. The temperature-measuring paint can solve the problems of low temperature-measuring precision, easy residue after temperature measurement and environmental pollution caused by the oily single-color irreversible temperature-measuring paint, and can also solve the problem of complex preparation process of the temperature-measuring paster.

The technical scheme of the invention is as follows:

the formula of the water-based strippable single-color-change irreversible temperature indicating coating comprises the following components in percentage by mass:

the resin is any one of commercially available water-based SBS emulsion, water-based strippable acrylic emulsion and water-based strippable PU emulsion; the solid parts of the resin are all 50 percent;

the filler is one or more of silicon dioxide, talcum powder, quartz powder, kaolin and aluminum oxide;

the color-changing pigment is any one of zinc stearate, lead stearate, calcium stearate and cadmium stearate;

the auxiliary agent is one or more of byk190, byk191, byk192, FA179 and byk 180;

the solvent is deionized water.

The invention also provides a preparation method of the water-based strippable single-color-change irreversible thermopaint, which is characterized by comprising the following production steps:

(1) weighing and batching, namely adding a solvent and an auxiliary agent according to the formula amount, stirring at a high speed until the auxiliary agent is completely dissolved, sequentially adding a filler and a color-changing pigment, and stirring while adding materials until the system is uniform and has no agglomeration to obtain a slurry;

(2) grinding and dispersing: feeding the prepared slurry into a sand mill for grinding and dispersing, adding the resin emulsion when the fineness is not more than 30 mu m, stirring at a high speed, controlling the stirring speed at 200-300 r/min, and stirring for 30-60 min to uniformly disperse the components;

(3) discharging: and filtering the dispersed paint liquid by using a 120-mesh screen and canning to obtain the water-based strippable temperature indicating paint.

The coating can be coated by brushing or spraying, and the thickness is suitable to be 50-80 mu m; after finishing coating, naturally drying at room temperature for 24 hours to measure the temperature; after the color of the coating is changed, the coating can be easily peeled off manually only by naturally cooling to room temperature.

The invention has the beneficial effects that: the water-based strippable single-color-change irreversible temperature indicating coating prepared by the invention has the advantages that before color change, the color of a paint film is white; after the color of the paint film is changed, the paint film becomes transparent and has obvious color changing effect. The color changing speed is high, and the color can be changed immediately when the specified color changing temperature is reached; the temperature measurement precision is high, and the temperature measurement error is +/-5 ℃. After the temperature measurement is finished, the temperature measurement component is easy to strip and remove, and the subsequent surface treatment of the temperature measurement component is not influenced.

Detailed Description

This example demonstrates a waterborne strippable single-discoloration irreversible thermopaint and a method for its preparation.

The first embodiment is as follows:

accurately 54.0g of deionized water and 1.0g of byk190 were weighed and stirred with high speed until byk190 was completely dissolved. And controlling the stirring speed at 200-300 r/min, sequentially adding 5.0g of talcum powder and 10.0g of lead stearate, and continuously stirring until the system is uniform and has no agglomeration to obtain the slurry. The prepared slurry was sent to a sand mill to be ground and dispersed, and the fineness was measured to be 30 μm. Then, adding 30.0g of water-based SBS emulsion, stirring at a high speed, controlling the stirring speed at 200-300 r/min, and stirring for 30min to uniformly disperse the components. And finally, filtering the dispersed paint liquid by using a 120-mesh screen and canning to obtain the water-based strippable temperature indicating paint. The paint number is 1, and the technical indexes are shown in Table 1.

Example two:

accurately weighed 42.0g of deionized water, 4.0g of byk192, 1.0g of 1.0gFA179 and stirred with high speed until byk192 and FA179 are completely dissolved. And controlling the stirring speed at 200-300 r/min, sequentially adding 6.0g of silicon dioxide and 12.0g of cadmium stearate, and continuously stirring until the system is uniform and has no agglomeration to obtain the slurry. The prepared slurry was sent to a sand mill to be ground and dispersed, and the fineness was measured to be 30 μm. Then, 35.0g of water-based strippable acrylic emulsion is added, high-speed stirring is used, the stirring speed is controlled to be 200-300 r/min, and stirring is carried out for 30min, so that all the components are uniformly dispersed. And finally, filtering the dispersed paint liquid by using a 120-mesh screen and canning to obtain the water-based strippable temperature indicating paint. The paint 2 is marked and the technical indexes are detailed in Table 1.

Example three:

accurately weighed 36.0g of deionized water, 1.0g of byk191, 1.0g of 1.0gFA179 and stirred with high speed until byk191 and FA179 are completely dissolved. And controlling the stirring speed at 200-300 r/min, sequentially adding 8.0g of quartz powder and 14.0g of zinc stearate, and continuously stirring until the system is uniform and has no agglomeration to obtain the slurry. The prepared slurry was sent to a sand mill to be ground and dispersed, and the fineness was measured to be 30 μm. Then, 40.0g of the aqueous strippable PU emulsion is added, high-speed stirring is used, the stirring speed is controlled to be 200-300 r/min, and stirring is carried out for 50min, so that all the components are uniformly dispersed. And finally, filtering the dispersed paint liquid by using a 120-mesh screen and canning to obtain the water-based strippable temperature indicating paint. The paint 3 is marked, and the technical indexes are shown in table 1.

Example four:

22.0g of deionized water, 2.0g of byk180, 1.0g of 1.0gFA179 were weighed out accurately and stirred with high speed until byk180 and FA179 were completely dissolved. And controlling the stirring speed at 200-300 r/min, sequentially adding 10.0g of aluminum oxide and 15.0g of calcium stearate, and continuously stirring until the system is uniform and has no agglomeration to obtain the slurry. The prepared slurry was sent to a sand mill to be ground and dispersed, and the fineness was measured to be 30 μm. Then, adding 50.0g of water-based SBS emulsion, stirring at a high speed, controlling the stirring speed at 200-300 r/min, and stirring for 60min to uniformly disperse the components. And finally, filtering the dispersed paint liquid by using a 120-mesh screen and canning to obtain the water-based strippable temperature indicating paint. Marked as coating 4, the technical indexes are detailed in table 1.

The implementation effect is as follows:

TABLE 1 technical indices of aqueous strippable temperature-indicating coatings

Item	Color before color change	Color after color change	Color change temperature of	Color error, deg.C	Peel Strength after discoloration, N
						Coating 1	White colour	Is transparent	115	±5	4～6
Paint 2	White colour	Is transparent	115	±5	4～6
						Coating 3	White colour	Is transparent	135	±5	4～6
Coating 4	White colour	Is transparent	155	±5	4～6

The present disclosure has been described in terms of the above-described embodiments, which are merely exemplary of the implementations of the present disclosure. It must be noted that the disclosed embodiments do not limit the scope of the disclosure. Rather, variations and modifications are possible within the spirit and scope of the disclosure, and these are all within the scope of the disclosure.