CN116891663A - Gradient color coating for rail transit vehicles and construction method thereof - Google Patents

Abstract

The invention discloses a gradient color paint for rail transit vehicles, which comprises a basic color paint and a single pigment color paint for color mixing; the basic color paint is any one or two of a double-component color paint and a single-component color paint, and the single pigment color paint is any one or two of the double-component color paint and the single-component color paint. The color-stable color paint prepared by the preparation method of the gradient color paint can realize the stable gradient of the color of the reference color paint through a peristaltic pump and dispersing equipment, and then the effect that the spraying color tends to linearly change is achieved by using proper spraying equipment for construction.

Description

Gradient color paint for rail transit vehicles and its construction method

Technical field

The present invention relates to the technical field of coatings, and in particular to a gradient color coating for rail transit vehicles and a construction method thereof.

Background technique

With the rapid development of rail transit, the demand for rail transit vehicles is also increasing, and the demand for customization and individualization of body appearance is increasing. The gorgeous appearance design makes rail transit vehicles have a strong visual focus and is a new development trend in rail transit vehicle painting.

Gradient color painting is very suitable for rail transit vehicles with long bodies and large areas, and is especially suitable for rail transit body painting that has extremely high color requirements. Due to China's vast territory and long history and culture, various regions have different aesthetics and requirements for the painting of rail transit vehicles around them. Different colors and patterns are displayed in front of the public and become an important part of the overall painting effect. Gradient color has the construction advantages of being colorful and easy to express characteristic modeling design, making it the best choice for special coating of rail transit. In the process of painting the entire rail transit vehicle, the painting effects and color differences of different vehicles and different carriages are required to be highly consistent. This requires that the gradient color needs to have high color stability and smooth color change. Therefore, the coating of rail transit vehicles requires a gradient paint coating solution with good color accuracy, good color stability, and good coating stability.

In view of the above practical needs, the present invention is proposed.

Contents of the invention

The purpose of the present invention is to provide a gradient color paint for rail transit vehicles and a construction method thereof, so as to solve one or more of the above-mentioned existing technical problems.

On the one hand, the invention provides a gradient color paint for rail transit vehicles, including a base color paint and a single-pigment color paint for color mixing; the base color paint is a two-component color paint or a single-component color paint. Any one or two kinds of paints, the single pigment paint is any one or two kinds of two-component paints or single-component paints.

In some embodiments, the two-component paint includes component A and component B; the component A includes, in parts by weight:

The B component includes, in parts by weight:

Curing agent 60-100 parts,

Solvent 0-40 parts.

In certain embodiments, component A is prepared by:

(1) Disperse the solvent, dispersant and defoaming agent evenly to form a mixed liquid;

(2) Add the pigment to the mixed liquid and disperse it evenly to make a pigment slurry;

(3) The pigment slurry passes through grinding equipment to grind the pigment to a fineness of less than 10 microns to make a color slurry;

(4) Add resin and solvent into the paint mixing tank, and add color paste in a dispersed state. After mixing evenly, add wetting agent, leveling agent, thickener, and solvent. After evenly dispersed, filter and package to obtain A Component;

The preparation method of component B is:

Mix the curing agent and solvent evenly, filter and package to prepare component B;

Mix component A and component B evenly to prepare a two-component paint.

In certain embodiments, the one-component paint consists of component A; the component A includes, in parts by weight:

In certain embodiments, preparation of component A:

1) Disperse the solvent, dispersant and defoaming agent evenly to form a mixed liquid;

2) Add the pigment to the mixed solution and disperse it evenly to make a pigment slurry;

3) The pigment slurry passes through grinding equipment to grind the pigment to a fineness of less than 10 microns to make a color slurry;

4) Add resin and solvent into the paint mixing tank, and add color paste in a dispersed state. After mixing evenly, add wetting agent, leveling agent, thickener, and solvent. After evenly dispersed, filter and package to obtain Group A. share.

In certain embodiments, the resin includes any one or more combinations of acrylic resin, polyester resin, polyurethane resin, fluorocarbon resin, silicone resin, amino resin, epoxy resin, and epoxy ester resin; The pigments include any one or more combinations of inorganic and organic pigments such as heavy metal-free carbon black powder, titanium dioxide, iron oxide, phthalocyanine blue, phthalocyanine green, etc.; the dispersants include ionic and non-ionic dispersions. Any one of agent or high molecular weight dispersant, preferably a high molecular weight dispersant; the defoaming agent is any one of silicone defoaming agent or non-silicon defoaming agent, preferably silicone Copolymer defoamer; the wetting agent includes any one of polymer non-silicon wetting agents or silicone wetting agents, preferably silicone wetting agents; the leveling agent includes polyacrylic acid Any one of ester leveling agents or silicone leveling agents, preferably acrylic leveling agents; the thickeners include clay thickeners, polyamide thickeners, alkali swelling thickeners or polyurethane thickeners. Any one of the thickeners is preferably a polyurethane thickener; the solvent includes any one of esters, ethers, benzene, and ketones, and is preferably an ester or ether solvent with high environmental protection.

In certain embodiments, the curing agent includes any one or more combinations of isocyanate curing agents and amine curing agents.

On the other hand, the invention provides a method for constructing gradient paint for rail transit vehicles. The gradient paint is the above-mentioned paint, which includes the following steps: applying one or more single pigment paints in proportion, through The peristaltic pump regularly and quantitatively adds the paint to the dispersion tank containing the base color paint to maintain uniform dispersion and adjust the color. Then spraying equipment is used for construction to achieve the effect of a linear change in spray color.

Among them: the realization of gradient color is to add one or more single pigment paints regularly and quantitatively to the base paint, and gradually change the color of the base paint through uniform mixing to achieve a controllable color gradient effect. The base color paint is the initial color of the gradient color. It can be a single-pigment paint or a color paint obtained by mixing different pigments. The color paint used for gradient color mixing must be a single-pigment color paint. The purpose is to ensure Accuracy and stability of color gradients.

Further, the single-pigment paint includes a single-pigment paint made from any one of inorganic and organic pigments that do not contain heavy metals.

The exterior painting area of rail transit vehicles is large, which places certain requirements on the accuracy of the hue of the art colors and the smooth transition of different colors. As a key equipment in the paint making process, the peristaltic pump is very suitable for the production of paints with extremely high color requirements and the painting process with excellent color gradient effects. The peristaltic pump can strictly and accurately control the linear change in the amount of color paint added. The entire addition process is visible and controllable, so that the color change of the base color paint tends to be smooth and linear, ensuring the stability and reproducibility of the gradient color product. The working principle of a peristaltic pump is as follows:

As shown in Figure 1, the gland and rollers of the pump compress the hose, and the hose between the two rollers is pillow-shaped. When the rollers rotate, the elastic delivery hose will be squeezed and released alternately to pump. Send single-pigment paint into a container that remains dispersed at a fixed time. As the roller rolls, the elasticity of the hose will continuously restore the pump pipe to its original shape, forming a negative pressure at the pump inlet, prompting the paint to flow and fill the pipe, achieving the purpose of transmission. The pillow-shaped volume formed has a certain relationship with the wall thickness and inner diameter of the peristaltic pump hose and the size of the rollers.

The flow rate of the pump depends on the speed of the pump head and the wall thickness of the hose. Generally, the volume of paint delivered each time is the same.

Furthermore, the peristaltic pump includes any one or more combination of timing, quantitative, metering, and flow rate working modes, and is preferably a high-precision digital peristaltic pump whose flow rate can reach 0.001 mL/min.

A peristaltic pump is used to regularly and quantitatively add one or more single pigment paints, and dispersion equipment is required to ensure that the main paint is in a uniform state at all times. Since the main paint is consumed at any time, the timing and quantitative addition of a single pigment paint is extremely important to ensure the hue stability and smooth change of the product and obtain stable hue changes.

Further, the dispersing equipment includes dispersing equipment using either pneumatic or electric power, preferably a dispersing equipment that can stably operate at a speed of 0-7000 rpm.

Paints with continuously changing colors are applied using appropriate spraying equipment to create a color gradient effect on the surface of the object to be painted.

Further, the spraying equipment includes any one of air spraying equipment, air-mixed spraying equipment, airless spraying equipment, electrostatic spraying equipment, rotary cup, and dish selection spraying equipment; if it is a two-component paint, it can be accurately mixed according to the proportion if needed. Two-component spray equipment for paint and curing agent.

Beneficial effects: The preparation method of the gradient paint provided by the present invention can produce a stable color paint. Through the peristaltic pump and dispersion equipment, the base color paint can achieve a stable gradient color, and then use appropriate spraying equipment for construction to achieve spraying. The color tends to change linearly.

Description of the drawings

Figure 1 is a working principle diagram of the peristaltic pump of the present invention.

Detailed ways

The present invention will be described in further detail below through embodiments.

The raw materials used in the present invention are all commercially available products.

The resin was selected as hydroxyl acrylic resin with a solid content of 45% and a hydroxyl content (to solid) of 3.3%. It was used as the resin in composition A and was purchased from Covestro (China) Co., Ltd. with the product number of Bayhydrol A145. (single component resin)

The curing agent is an aliphatic polyisocyanate with a solid content of 100% and an NCO content (to solid) of 20.8%. It is used as the curing agent component of the two-component polyurethane system in composition B and is purchased from Covestro (China) Co., Ltd. Company, product number Bayhydur 2655.

Rutile titanium dioxide was used as the white pigment. As a pigment for single-pigment paint, the solid content was 100%. It was purchased from Chemours Chemical (China) Co., Ltd. with product number R 706.

The color number of the permanent red pigment is PR170 red pigment. As a single pigment paint pigment, the solid content is 100%. It is purchased from Lily Group Co., Ltd. and the product number is HB-5RKB.

The color number of the rose red pigment is PR122 red pigment. As a single pigment paint pigment, the solid content is 100%. It is purchased from Lily Group Co., Ltd. and the product number is 1171.

The black pigment is carbon black pigment with color number PB7. As a single pigment paint pigment, the solid content is 100%. It is purchased from Mitsubishi Corporation of Japan, and the product number is MA100.

The dispersant was an acrylate copolymer containing pigment affinity groups with an active ingredient content of 40%. It was purchased from BYK Chemical (China) Co., Ltd. with the product number of BYK 190.

The defoaming agent is a mixture of polyethersiloxane copolymer and hydrophobic particles, with an active ingredient content of 24%. It is purchased from Digao (China) Co., Ltd., and the product number is Airex 902W.

The wetting agent was a polyether-modified silicone solution with an active ingredient content of 52%, which was purchased from BYK Chemical (China) Co., Ltd. with the product number of BYK 346.

The leveling agent uses an ionic polyacrylic acid copolymer solution with an active ingredient content of 52%. It is purchased from BYK Chemical (China) Co., Ltd. with the product number of BYK 381.

The thickener was a nonionic polyurethane solution with an active ingredient content of 60%, which was purchased from Digao (China) Co., Ltd. with the product number of ViscoPlus 3030.

The solvent for component A is deionized water, which is made by the company.

Propylene glycol diacetate is used as the solvent for component B. It has a molecular weight of 160.17, a boiling point of 191°C, and low toxicity. It is purchased from Dow Chemical (China) Co., Ltd.

The peristaltic pump is a pulse distribution type peristaltic pump with a maximum speed of 600 rpm and a flow range of 0.001-880 ml/min. It was purchased from Shanghai Zhixin Instrument Co., Ltd.

Test base material: aluminum plate. The length, width and thickness of the steel plate are 3 meters, 2 meters and 1 mm respectively. They were purchased from Guangzhou Honghong Trading Co., Ltd.

The two-component single-pigment paint is composed of component A and component B; the component A includes, in parts by weight:

The B component includes, in parts by weight:

Curing agent 60-100 parts

Solvent 0-40 parts

Preparation of component A:

1) Disperse the solvent, dispersant and defoaming agent evenly to form a mixed liquid;

2) Add a single pigment into the mixed liquid and disperse it evenly to make a pigment slurry;

3) The pigment slurry passes through grinding equipment to grind the pigment to a fineness of less than 10 microns to make a color slurry;

4) Add resin and solvent into the paint mixing tank, and add color paste in a dispersed state. After mixing evenly, add wetting agent, leveling agent, thickener, and solvent. After evenly dispersed, filter and package.

to component A;

Preparation of component B:

1) Mix the curing agent and solvent evenly, filter and package to prepare component B;

Through the above preparation process, four single-pigment paints are prepared as component A, namely black paint, white paint, permanent red paint, and rose red paint; one curing agent is prepared as component B.

(1) Use white paint, permanent red paint, and rose red paint to prepare a total of 1 kg of base color paint according to the following proportions.

Paint formula Permanent red paint (%) White paint (%) Rose red paint (%) Base color paint 82 15 3

Use a peristaltic pump to drop the black paint into the base color paint at a fixed dosage of 6 ml/min, and use an electric disperser to disperse to achieve a gradual color change. Finally sprayed on the surface of the substrate.

(2) Use white paint, permanent red paint, and rose red paint to prepare a total of 1 kg of base color paint according to the following proportions. At the same time, prepare 6 color paints according to the following formula, and spray them on the surface of the substrate in sections.

The preparation method is specifically as follows:

S1. Mix deionized water, high molecular weight block copolymer solution containing pigment affinity groups, modified polyether siloxane solution and a certain proportion of organic pigments (including but not limited to phthalocyanine pigments, azo pigments, etc.) to make the base Colored organic matter) are mixed, dispersed and sanded at a temperature of 35-45°C to obtain a special color paint with stable color;

Precisely add the peristaltic pump according to the color number of the standard color plate to avoid color deviation and waste of raw materials;

S2. Intermittently add quantitatively while the specific dispersing equipment maintains the dispersed state at all times to prepare a special color paint.

The special colored paint provided in the embodiment of the present invention is prepared by using the preparation method provided in the embodiment of the present invention.

After adding the aliphatic isocyanate curing agent to the gradient main agent, the =NCO double bond in the hydroxy acrylic polyurethane resin and the aliphatic isocyanate is triggered to polymerize, and the gradient paint solidifies into a film.

The gradient color main agent (main paint with a specific color) in the embodiment of the present invention includes the special color paint provided in the embodiment of the present invention.

The method for applying the gradient color provided by the present invention is as follows:

The gradient color scheme provided by this embodiment includes an independently stored curing agent and the gradient color main agent of the embodiment of the present invention;

Preferably, the curing agent accounts for 25-35% of the mass of the gradient color main agent.

Preferably, the curing agent is an aliphatic isocyanate.

The gradient color application method provided in this embodiment includes mixing the above-mentioned curing agent and the above-mentioned gradient color main agent and then applying it to the surface of the target object.

The features and performance of the present invention will be described in further detail below with reference to examples.

Example 1

This embodiment provides a method for preparing gradient colors, specifically:

First add acrylic/polyurethane resin to the dispersion tank, then add solvent, dispersant, wetting agent, leveling agent, defoaming agent, and deionized water in sequence while maintaining the dispersed state. While maintaining the dispersed state, use a specific peristaltic pump to quantitatively add the above-prepared special color paint, and stir for about 20 minutes until the mixture is evenly stirred; that is, the specific color paint is produced.

The proportions of raw materials used in the preparation process of the specific color paints of the Examples are shown in Table 1:

Table 1 Example specific color paint preparation raw material dosage formula

The preparation method of the gradient color main agent provided in this embodiment is as follows:

According to the dosage ratio in Table 2, add the prepared specific paint, resin, solvent, grinding paste, and additives (leveling agent, wetting agent, defoaming agent) to the high-speed mixing equipment in sequence at 500 rpm/ Mix at a stirring speed of 10 minutes for 10 minutes to prepare the gradient color main agent; then use specific peristaltic pump equipment to sequentially add the color paint (gradient color main agent) quantitatively, mix evenly, and then add rheological additives in the specific mixing equipment at Continue dispersing at a speed of 500 rpm for about 30 minutes until the mixture is evenly mixed to prepare the gradient color main agent n.

Example 2

This embodiment is basically the same as Embodiment 1, except that the dosage of the specific color paint is 0.01kg.

Example 3

This embodiment is basically the same as Embodiment 1, except that the dosage of the specific color paint is 0.02kg.

Example 4

This embodiment is basically the same as Embodiment 1, except that the dosage of the specific color paint is 0.03kg.

Example 5

This embodiment is basically the same as Embodiment 1, except that the dosage of the specific color paint is 0.04kg.

The proportions of raw materials used in the preparation process of the gradient color main agent n are shown in Table 2:

Table 2 Raw material formula ratios of Examples 1-5

Comparative Example 1-5

The preparation method of Comparative Examples 1-5 is basically the same as that of Example 1, except that the specific colorant addition method is different from that of Example 1.

Example 1 A specific peristaltic pump is used to accurately add the color slurry in a timed, quantitative and gradual manner, and keep the main agent dispersed at all times, and keep the dispersion at all times while adding all the materials, to produce a stable gradient color main agent n to n+ 1.

Compared with Example 1, in Comparative Example 1, a professional colorist 1 manually added specific color pastes for color mixing, and weighed using an analytical grade balance to prepare gradient color main agents n to n+1.

Compared with Example 1, in Comparative Example 2, a professional colorist 2 manually added specific color pastes for color mixing, and weighed using an analytical grade balance to prepare gradient color main agents n to n+1.

Compared with Example 1, in Comparative Example 3, a professional colorist 3 manually added specific color pastes for color mixing, and weighed using an analytical grade balance to prepare gradient color main agents n to n+1.

Compared with Example 1, in Comparative Example 4, a professional colorist 4 manually added specific color pastes for color mixing, and weighed using an analytical grade balance to prepare gradient color main agents n to n+1.

Compared with Example 1, in Comparative Example 5, a professional colorist 5 manually added specific color pastes for color mixing, and weighed using an analytical grade balance to prepare gradient color main agents n to n+1.

The color difference between the specific gradient color main agents n and n+1 is shown in Table 3:

Test Methods

Mix (100) parts by weight of the gradient main agent and (30) parts by weight of the curing agent in the above-mentioned Example 1 and Comparative Examples 1 to 5, and apply them on an aluminum plate with a 55 μm polyurethane white intermediate coating (aluminum plate thickness 1 mm) , conduct film curing at 60°C*2h, and obtain the gradient color cured films in Example 1 and Comparative Examples 1 to 5 respectively. Colorimeter testing (cooperating with visual judgment) was performed on each gradient color paint film. The results are listed in the table below. 3:

Table 3 Color difference data of gradient colors in Comparative Examples 1-5

Comparative example 1 Comparative example 2 Comparative example 3 Comparative example 4 Comparative example 5 Example 1 L 37.15 37.55 36.13 35.86 37.09 37.22 A 62.15 65.44 59.02 63.41 59.89 60.24 B 44.42 47.52 46.52 45.98 44.12 45.60 δE 0.89 1.85 2.51 1.54 1.26 0.17

The color difference test judgment complies with the requirements of GB/T9754 and GB/T9761.

The color differences shown in Comparative Examples 1-5 are much larger than those in Example 1 due to artificially added factors. Even if an analytical grade balance is used for weighing, the problem of large color differences cannot be avoided.

Since the preparation of the gradient color main agent includes the specific peristaltic pump provided by the present invention to add the special color slurry regularly and quantitatively, the gradient color main agent has excellent color stability and smooth color transition from n to n+1. By using a peristaltic pump to quantitatively add color paste, the color deviation caused by inaccurate addition during the production process is reduced, the unnecessary amount of color paste is reduced, and the color stability of the gradient color main agent is ensured. The stability between color n and n+1 is achieved. It solves the inaccuracy of traditional manual color mixing and the uncertainty of the amount of color paste added, and is very suitable for large-area and multi-color painting construction of rail transit vehicles.

To sum up: the preparation method of gradient color paint provided by the present invention can produce a color paint with stable color. Through the peristaltic pump and dispersion equipment, the color of the base color paint can be gradually changed stably, and then suitable spraying equipment can be used for construction. Achieve the effect of spray color tending to change linearly.

The above expressions are only preferred modes of the present invention. It should be pointed out that for those of ordinary skill in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, and these should also be regarded as the protection of the invention. within the range.

Claims (10)

1. A gradient color paint for rail transit vehicles, comprising a base color paint and a single pigment color paint for color mixing; the basic color paint is any one or two of a double-component color paint and a single-component color paint, and the single pigment color paint is any one or two of the double-component color paint and the single-component color paint.

2. The gradient color coating for rail transit vehicles of claim 1, wherein the two-component color paint comprises a component a and a component B; the component A comprises the following components in parts by weight:

the component B comprises the following components in parts by weight:

60-100 parts of curing agent,

0-40 parts of solvent.

3. A gradient paint for rail transit vehicles as claimed in claim 2, wherein,

the preparation method of the component A comprises the following steps:

(1) Uniformly dispersing a solvent, a dispersing agent and a defoaming agent to form a mixed solution;

(2) Adding pigment into the mixed solution, and uniformly dispersing to prepare pigment slurry;

(3) Grinding pigment slurry to fineness of below 10 microns through grinding equipment to prepare color paste;

(4) Adding resin and solvent into a paint mixing cylinder, adding color paste in a dispersed state, uniformly mixing, adding wetting agent, flatting agent, thickener and solvent, uniformly dispersing, and filtering and packaging to obtain a component A;

the preparation method of the component B comprises the following steps:

uniformly mixing a curing agent and a solvent, filtering and packaging to prepare a component B;

and uniformly mixing the component A and the component B to prepare the double-component color paint.

4. The gradient color coating for rail transit vehicles of claim 1, wherein the one-component color paint is composed of a component a; the component A comprises the following components in parts by weight:

5. a gradient paint for rail transit vehicles as claimed in claim 1, wherein,

and (3) preparation of a component A:

1) Uniformly dispersing a solvent, a dispersing agent and a defoaming agent to form a mixed solution;

2) Adding pigment into the mixed solution, and uniformly dispersing to prepare pigment slurry;

3) Grinding pigment slurry to fineness of below 10 microns through grinding equipment to prepare color paste;

4) Adding resin and solvent into a paint mixing cylinder, adding color paste in a dispersed state, uniformly mixing, adding wetting agent, leveling agent, thickener and solvent, uniformly dispersing, filtering and packaging to obtain the component A.

6. A gradient color coating for rail transit vehicles according to claim 2 or 4, wherein the resin comprises any one or more combinations of acrylic resin, polyester resin, polyurethane resin, fluorocarbon resin, silicone resin, amino resin, epoxy ester resin; the pigment comprises any one or a combination of a plurality of inorganic and organic pigments such as carbon black powder without heavy metal, titanium dioxide, ferric oxide, phthalocyanine blue, phthalocyanine green and the like; the dispersing agent comprises any one of ionic dispersing agent, nonionic dispersing agent or high molecular weight dispersing agent, preferably high molecular weight dispersing agent; the defoaming agent is any one of an organic silicon type defoaming agent or a non-silicon type defoaming agent, and is preferably a siloxane copolymer defoaming agent; the wetting agent comprises any one of a polymer non-silicon type wetting agent or an organic silicon type wetting agent, preferably an organic silicon type wetting agent; the leveling agent comprises any one of polyacrylate leveling agent or organic silicon leveling agent, and is preferably acrylate leveling agent; the thickener comprises any one of clay thickener, polyamide thickener, alkali swelling thickener or polyurethane thickener, preferably polyurethane thickener; the solvent comprises any one of esters, ethers, benzene and ketones, and is preferably an ester or ether solvent with high environmental protection.

7. The gradient color coating for rail transit vehicles of claim 2, wherein the curing agent comprises any one or more combinations of isocyanate curing agents and amine curing agents.

8. A method of constructing a gradient color paint for rail transit vehicles, the gradient color paint being the paint of any one of claims 1 to 7, comprising the steps of: one or more single pigment colored paints are added into a dispersion cylinder containing the reference colored paint in a fixed time and a fixed quantity through a peristaltic pump according to a proportion, the uniform dispersion is kept, the color is adjusted, and then the spraying equipment is used for construction, so that the effect that the spraying color tends to linearly change is achieved.

9. The method for applying a gradient color coating material to a rail transit vehicle according to claim 8, wherein the peristaltic pump is a peristaltic pump with a minimum addition amount of 0.001 mL/min.

10. The construction method of the gradient color coating for the rail transit vehicle according to claim 8, wherein the spraying equipment is any one of air spraying equipment, mixed gas spraying equipment, airless spraying equipment, electrostatic spraying equipment, rotary cup and disc selecting spraying equipment; in the case of two-component coatings, two-component spraying equipment is used which can mix the color paint and the curing agent in a precise ratio.