Flame-retardant phthalocyanine blue pigment as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of organic pigments, and particularly relates to a flame-retardant phthalocyanine blue pigment as well as a preparation method and application thereof. The flame-retardant phthalocyanine blue pigment comprises CuPC-MEL-DEA and a copper phthalocyanine blue pigment which are mixed according to a set proportion, the structural formula of the CuPC-MEL-DEA is shown in the specification, and the preparation method of the # imgabs0 # comprises the following steps: introducing molecules of melamine and derivatives thereof with flame-retardant characteristics to copper phthalocyanine pigment molecules to obtain organic pigment derivatives with flame-retardant characteristics; and modifying an organic pigment by using the derivative to obtain a flame-retardant phthalocyanine blue product. The flame-retardant phthalocyanine blue product provided by the invention is used for coloring high polymers, so that the high polymers and products thereof have bright colors and excellent flame retardance.

Description

Technical Field

[0001] The invention belongs to the technical field of organic pigments, and in particular relates to a flame retardant phthalocyanine blue pigment and a preparation method and application thereof. Background Art

[0002] Polymer is a macromolecular material composed of a specific unit structure. Plastic, as a large category of polymers, is widely used in various industries because of its characteristics of light weight, durability, easy processing, moisture resistance, and corrosion resistance. Plastics represented by epoxy resin (EP), polypropylene (PP), polyurethane (PU), polyethylene / polystyrene (PE / PS), etc. are inseparable from human life and modern industry. Polymer materials are colored by organic pigments, so that polymer products have various bright colors.

[0003] Phthalocyanine blue pigment is one of the important categories of organic pigments. It not only has excellent chemical stability, but also has the characteristics of resistance to strong acids, alkalis, solvents and weather fastness, and is widely used in plastic coloring. However, as an organic pigment, phthalocyanine blue pigment is flammable, and smoldering may occur when there is poor heat dissipation during the production process.

[0004] As a high molecular polymer, plastic is essentially composed of three elements: C, H, and O. Organic pigment molecules are mainly composed of atoms such as C, H, O, and N. Therefore, after the polymer material is colored with phthalocyanine blue pigment, it also has the characteristics of being flammable and combustible. Once the formation conditions of the four elements of combustion (combustibles, ignition sources, combustion-supporting materials, and free radical reactions) are met, it is very easy to burn violently in the air, releasing a large amount of heat accompanied by thick smoke and toxic gas release. This inherent flammability not only limits the application scope of polymers, but also causes fires that pose serious threats to people's lives and property every year.

[0005] How to improve the flame retardancy of polymer material products colored with phthalocyanine blue pigment is a technical problem that needs to be solved urgently. Summary of the invention

[0006] In order to solve the above technical problems, the present invention first provides a flame retardant phthalocyanine blue pigment, which is modified by using an organic pigment derivative with flame retardant properties to obtain a modified pigment with flame retardant properties.

[0007] The present invention adopts the following technical solutions:

[0008] A flame retardant phthalocyanine blue pigment comprises CuPC-MEL-DEA and copper phthalocyanine blue pigment mixed in a set ratio, wherein the structural formula of the CuPC-MEL-DEA is shown in Formula I:

[0009]

[0010] Preferably, the added amount of CuPC-MEL-DEA accounts for 30-70 wt % of the phthalocyanine blue pigment, and the rest is copper phthalocyanine blue pigment.

[0011] The second object of the present invention is to provide a method for preparing a flame retardant phthalocyanine blue pigment as described above, comprising introducing molecules of melamine and its derivatives having flame retardant properties into organic pigment molecules to obtain an organic pigment derivative having flame retardant properties.

[0012] The preparation method comprises the following steps:

[0013] S1. Dissolve copper phthalocyanine in concentrated sulfuric acid, add paraformaldehyde and melamine, stir thoroughly, and keep warm at 65-105°C for 5 hours, wherein the mixing mass ratio of copper phthalocyanine: concentrated sulfuric acid: paraformaldehyde: melamine is (28.8-86.4):(300-500):(4.5-20):(15-65);

[0014] S2. A mixture of formaldehyde and diethanolamine was added dropwise to the system. After the addition was completed, the mixture was heated for a second time at 65 to 105° C. for 5 hours, then poured into ice water for dilution, filtered, washed, and dried to obtain the target product CuPC-MEL-DEA, wherein the structure of the CuPC-MEL-DEA is shown in Formula Ⅰ:

[0015]

[0016] S3. Fully mix the CuPC-MEL-DEA powder and the copper phthalocyanine blue pigment to obtain a flame retardant phthalocyanine blue pigment.

[0017] Preferably, in step S2, in the mixture, the mass ratio of formaldehyde to diethanolamine is (9.0-40):(25-75), and the mass ratio of the total amount of the added mixture to copper phthalocyanine is (0.5-2.0):1.

[0018] Preferably, the mass fraction of the concentrated sulfuric acid is 98%, the purity of the copper phthalocyanine is greater than 98%, and the dissolution temperature is lower than 25°C.

[0019] Preferably, in step S3, the added amount of CuPC-MEL-DEA accounts for 30-70wt% of the phthalocyanine blue pigment, and the rest is copper phthalocyanine blue pigment.

[0020] The preparation route of the above CuPC-MEL-DEA can be expressed as follows:

[0021]

[0022] The preparation routes are mainly intended to illustrate the present invention and not to limit it.

[0023] The third object of the present invention is to provide the use of the flame retardant phthalocyanine blue pigment as described above in the preparation of flame retardant polymer materials.

[0024] Preferably, the polymer material is any one of PP, PE, PS, PET, PVC, PA, and PAN, or a mixture of several of them.

[0025] Preferably, the method for preparing the flame-retardant polymer material is to place the dried flame-retardant phthalocyanine blue pigment and polymer material particles in an extruder according to a set ratio for compounding and granulation to obtain the desired flame-retardant polymer material.

[0026] Preferably, the flame retardant phthalocyanine blue pigment and the polymer material particles are mixed in a mass ratio of (3-9):(91-97).

[0027] Preferably, the drying condition is drying at a temperature of 60-105° C. until the moisture content is less than 0.5 wt %.

[0028] The beneficial effects of the present invention are:

[0029] By introducing a group with flame retardant function into the phthalocyanine blue pigment molecule, the flame retardancy of the phthalocyanine blue pigment is improved, and at the same time, it has flame retardant properties. The largest industrial use of melamine is to prepare amino resins. Since the melamine combustion system absorbs heat and decomposes and releases ammonia, a polycondensate is formed, which accelerates surface carbonization, thereby playing a flame retardant role, it can be directly used as a flame retardant in the field of flame retardant insulation. Melamine can also be modified to prepare a series of melamine derivatives with flame retardant properties. The present application obtains copper phthalocyanine derivatives by chemically connecting copper phthalocyanine molecules and melamine and its derivatives with flame retardant properties, and then mixing the derivatives with phthalocyanine blue pigment to obtain an organic pigment phthalocyanine blue product with both color performance and flame retardant performance. When a fire accident occurs, melamine and its derivative groups absorb heat and decompose and release inert media such as ammonia, water vapor, and carbon dioxide, effectively reducing the surrounding combustible gas and oxygen concentrations, inhibiting the combustion of the substrate, and achieving the purpose of flame retardancy.

[0030] Phthalocyanine blue pigments used for coloring polymer materials are dispersed in the polymer material system in the form of fine particles. The smaller the pigment particles, the greater the surface free energy and the more serious the tendency to agglomerate, which will seriously affect the dispersion effect of the pigment particles in the polymer material, thereby affecting the coloring performance of the pigment. The copper phthalocyanine derivatives provided in this application are excellent dispersants for phthalocyanine blue pigments, which can effectively prevent the agglomeration of pigment particles and improve the dispersibility of pigment particles in polymer materials, thereby enabling polymers and their products to have brighter color vision.

[0031] Experiments show that the flame-retardant phthalocyanine blue pigment can effectively improve the LOI value and UL094 grade of the polymer, reduce the release of heat and smoke, and greatly improve the flame retardancy of colored polymer products. DETAILED DESCRIPTION

[0032] The technical solution of the present invention is described in more detail below in conjunction with embodiments and experiments.

[0033] Unless otherwise specified, the terms used herein have the meanings commonly understood by those skilled in the art.

[0034] Example 1

[0035] A method for preparing a flame retardant phthalocyanine blue pigment comprises the following steps:

[0036] S1.250g of 98% sulfuric acid is added to a four-necked flask, stirred and cooled, and 57.6g of copper phthalocyanine (CuPC) with a purity greater than 98% is slowly added. Stirring is continued at below 25°C until the copper phthalocyanine is completely dissolved, about 30 minutes. After stirring, 15g of paraformaldehyde and 60g of melamine (MEL) are slowly added. After stirring for 30 minutes, the temperature is raised to 95°C and kept warm for 5 hours.

[0037] S2. After the insulation is completed, a mixture of formaldehyde and diethanolamine (DEA) (including 30 g of formaldehyde and 70 g of diethanolamine) is slowly added dropwise to the system. After the addition is completed, the system is kept warm at 90°C for 5 hours. After the insulation is completed, the material is poured into ice water for dilution, filtered, washed, and dried, and finally the target product CuPC-MEL-DEA is obtained through a two-step Mannich reaction.

[0038] The structural formula of CuPC-MEL-DEA is shown in Formula I:

[0039]

[0040] S3. The CuPC-MEL-DEA dry powder is fully mixed with the phthalocyanine blue pigment dry powder in a mixer at a mass fraction of 50%. After the mixing is completed, the mixture is measured and packaged to finally obtain a flame-retardant phthalocyanine blue pigment.

[0041] Example 2

[0042] A method for preparing a flame retardant phthalocyanine blue pigment comprises the following steps:

[0043] S1.500g of 98% sulfuric acid is added to a four-necked flask, stirred and cooled, and 86.4g of copper phthalocyanine (CuPC) with a purity greater than 98% is slowly added. Stirring is continued for 30 minutes below 25°C until the copper phthalocyanine is completely dissolved. After stirring, 20g of paraformaldehyde and 65g of melamine (MEL) are slowly added. After fully stirring for 30 minutes, the temperature is raised to 95°C and kept warm for 5 hours.

[0044] S2. After the insulation is completed, a mixture of formaldehyde and diethanolamine (DEA) (40 g of formaldehyde and 75 g of diethanolamine) is slowly added dropwise to the system. After the addition is completed, the system is kept warm at 100°C for 5 hours. After the insulation is completed, the material is poured into ice water for dilution, filtered, washed, and dried, and finally the target product CuPC-MEL-DEA is obtained through a two-step Mannich reaction.

[0045] The structural formula of CuPC-MEL-DEA is shown in Formula I:

[0046]

[0047] S3. The CuPC-MEL-DEA dry powder is fully mixed with the phthalocyanine blue pigment dry powder in a mixer at a mass fraction of 50%. After the mixing is completed, the mixture is measured and packaged to finally obtain a flame-retardant phthalocyanine blue pigment.

[0048] Example 3

[0049] A method for preparing a flame retardant phthalocyanine blue pigment comprises the following steps:

[0050] S1.400g of 98% sulfuric acid is added to a four-necked flask, stirred and cooled, and 65g of copper phthalocyanine (CuPC) with a purity greater than 98% is slowly added. Stirring is continued for 30 minutes below 25°C until the copper phthalocyanine is completely dissolved. After stirring, 10g of paraformaldehyde and 50g of melamine (MEL) are slowly added. After stirring for 30 minutes, the temperature is raised to 95°C and kept warm for 5 hours.

[0051] S2. After the insulation is completed, a mixture of formaldehyde and diethanolamine (DEA) (including 20 g of formaldehyde and 55 g of diethanolamine) is slowly added dropwise to the system. After the addition is completed, the system is kept warm at 95°C for 5 hours. After the insulation is completed, the material is poured into ice water for dilution, filtered, washed, and dried, and finally the target product CuPC-MEL-DEA is obtained through a two-step Mannich reaction.

[0052] The structural formula of CuPC-MEL-DEA is shown in Formula I:

[0053]

[0054] S3. The CuPC-MEL-DEA dry powder is fully mixed with the phthalocyanine blue pigment dry powder in a mixer at a mass fraction of 50%. After the mixing is completed, the mixture is measured and packaged to finally obtain a flame-retardant phthalocyanine blue pigment.

[0055] Example 4

[0056] A method for preparing a flame retardant phthalocyanine blue pigment comprises the following steps:

[0057] S1.200g of 98% sulfuric acid is added to a four-necked flask, stirred and cooled, and 30g of copper phthalocyanine (CuPC) with a purity greater than 98% is slowly added. Stirring is continued at below 25°C until the copper phthalocyanine is completely dissolved, about 30 minutes. After stirring, 8g of paraformaldehyde and 30g of melamine (MEL) are slowly added. After stirring for 30 minutes, the temperature is raised to 95°C and kept warm for 5 hours.

[0058] S2. After the insulation is completed, a mixture of formaldehyde and diethanolamine (DEA) (including 15 g of formaldehyde and 45 g of diethanolamine) is slowly added dropwise to the system. After the addition is completed, the system is kept warm at 90°C for 5 hours. After the insulation is completed, the material is poured into ice water for dilution, filtered, washed, and dried, and finally the target product CuPC-MEL-DEA is obtained through a two-step Mannich reaction.

[0059] The structural formula of CuPC-MEL-DEA is shown in Formula I:

[0060]

[0061] S3. The CuPC-MEL-DEA dry powder is fully mixed with the phthalocyanine blue pigment dry powder in a mixer at a mass fraction of 50%. After the mixing is completed, the mixture is measured and packaged to finally obtain a flame-retardant phthalocyanine blue pigment.

[0062] Example 5

[0063] A colored polymer material sample is prepared by using a flame retardant phthalocyanine blue pigment. The method comprises the following steps: placing the flame retardant phthalocyanine blue pigment and polymer material particles in an oven at 60-105° C. and drying them until the moisture content is less than 0.2wt%, placing the dried flame retardant phthalocyanine blue pigment and polymer material particles in a twin-screw extruder at a mass ratio of (3-9):(91-97) for compounding and granulation, wherein the three-stage temperatures of the extruder are respectively set at 185-200° C., 205-220° C., and 210-225° C., placing the granulated particles in an oven and drying them at 60-105° C. until the moisture content is less than 0.2wt%, thereby obtaining the desired sample.

[0064] test

[0065] Referring to the preparation method of Example 5, colored polymer material samples were prepared respectively using the flame-retardant phthalocyanine blue pigments prepared in Examples 1-4, specifically:

[0066] Sample 1: The flame retardant phthalocyanine blue pigment and polymer material particles PP prepared in Example 1 are placed in an oven, dried at 75°C until the moisture content is less than 0.2wt%, and then the flame retardant phthalocyanine blue pigment and polymer material particles are placed in a twin-screw extruder at a mass ratio of 5:95 for compounding and granulation. The three-stage temperatures of the extruder are 195°C, 215°C, and 220°C, respectively. The granulated particles are placed in an oven and dried at 60°C until the moisture content is less than 0.2wt%, to obtain Sample 1.

[0067] Sample 2: The flame retardant phthalocyanine blue pigment and polymer material particles PE prepared in Example 2 are placed in an oven and dried at 85°C until the moisture content is less than 0.2wt%. The flame retardant phthalocyanine blue pigment and polymer material particles are placed in a twin-screw extruder at a mass ratio of 3:97 for compounding and granulation. The three-stage temperatures of the extruder are 185°C, 205°C, and 210°C, respectively. The granulated particles are placed in an oven and dried at 70°C until the moisture content is less than 0.2wt%, to obtain Sample 2.

[0068] Sample 3: The flame retardant phthalocyanine blue pigment and polymer material particles PS prepared in Example 3 are placed in an oven and dried at 85°C until the moisture content is less than 0.2wt%. The flame retardant phthalocyanine blue pigment and polymer material particles are placed in a twin-screw extruder at a mass ratio of 7:93 for compounding and granulation. The three-stage temperatures of the extruder are 195°C, 205°C, and 215°C, respectively. The granules are placed in an oven and dried at 850°C until the moisture content is less than 0.2wt%, to obtain Sample 3.

[0069] Sample 4: The flame retardant phthalocyanine blue pigment and polymer material particles PET prepared in Example 4 are placed in an oven and dried at 95°C until the moisture content is less than 0.2wt%. The flame retardant phthalocyanine blue pigment and polymer material particles are placed in a twin-screw extruder at a mass ratio of 9:91 for compounding and granulation. The three-stage temperatures of the extruder are 200°C, 205°C, and 215°C, respectively. The granulated particles are placed in an oven and dried at 105°C until the moisture content is less than 0.2wt%, to obtain Sample 4.

[0070] Blank sample 1: The polymer material particles PP are placed in an oven and dried at 75°C until the moisture content is less than 0.2wt%. The polymer material PP particles are placed in a twin-screw extruder for granulation. The three-stage temperatures of the extruder are 195°C, 215°C, and 220°C, respectively. The granulated particles are placed in an oven and dried at 60°C until the moisture content is less than 0.2wt%, to obtain blank sample 1.

[0071] Blank sample 2: The polymer material particles PE are placed in an oven and dried at 85°C until the moisture content is less than 0.2wt%. The polymer PE material particles are placed in a twin-screw extruder for granulation. The three-stage temperatures of the extruder are 185°C, 205°C, and 210°C, respectively. The granulated particles are placed in an oven and dried at 70°C until the moisture content is less than 0.2wt%, to obtain blank sample 2.

[0072] Blank sample 3: The polymer material particles PS are placed in an oven and dried at 85°C until the moisture content is less than 0.2wt%, and then the polymer material PS particles are placed in a twin-screw extruder for granulation. The three-stage temperatures of the extruder are 195°C, 205°C, and 215°C, respectively. The granulated particles are placed in an oven and dried at 850°C until the moisture content is less than 0.2wt%, to obtain blank sample 3.

[0073] Blank sample 4: The polymer material particles PET are placed in an oven and dried at 95°C until the moisture content is less than 0.2wt%. The polymer material PET particles are placed in a twin-screw extruder for granulation. The three-stage temperatures of the extruder are 200°C, 205°C, and 215°C, respectively. The granulated particles are placed in an oven and dried at 105°C until the moisture content is less than 0.2wt%, to obtain blank sample 4.

[0074] Comparative sample 1: The phthalocyanine blue pigment and polymer material particles PP purchased from the market were placed in an oven at 75°C and dried until the moisture content was less than 0.2wt%, and then the flame retardant phthalocyanine blue pigment and polymer material particles were placed in a twin-screw extruder at a mass ratio of 5:95 for compound granulation. The three-stage temperatures of the extruder were 195°C, 215°C, and 220°C, respectively. The granules were placed in an oven and dried at 60°C until the moisture content was less than 0.2wt%, to obtain comparative sample 1.

[0075] Comparative sample 2: The phthalocyanine blue pigment and polymer material particles PE purchased from the market were placed in an oven and dried at 85°C until the moisture content was less than 0.2wt%. The flame retardant phthalocyanine blue pigment and polymer material particles were placed in a twin-screw extruder at a mass ratio of 3:97 for compound granulation. The three-stage temperatures of the extruder were 185°C, 205°C, and 210°C, respectively. The granules were placed in an oven and dried at 70°C until the moisture content was less than 0.2wt%, to obtain comparative sample 2.

[0076] Comparative sample 3: The phthalocyanine blue pigment and polymer material particles PS purchased from the market were placed in an oven and dried at 85°C until the moisture content was less than 0.2wt%. The flame retardant phthalocyanine blue pigment and polymer material particles were placed in a twin-screw extruder at a mass ratio of 7:93 for compound granulation. The three-stage temperatures of the extruder were 195°C, 205°C, and 215°C, respectively. The granules were placed in an oven and dried at 850°C until the moisture content was less than 0.2wt%, to obtain comparative sample 3.

[0077] Sample 4: The phthalocyanine blue pigment and polymer material particles PET purchased from the market were placed in an oven and dried at 95°C until the moisture content was less than 0.2wt%. The flame retardant phthalocyanine blue pigment and polymer material particles were placed in a twin-screw extruder at a mass ratio of 9:91 for compound granulation. The three-stage temperatures of the extruder were 200°C, 205°C, and 215°C, respectively. The granulated particles were placed in an oven and dried at 105°C until the moisture content was less than 0.2wt%, to obtain comparison sample 4.

[0078] Samples 1-3, blank samples and control samples 1-3 were respectively pressed into sheets using a vulcanizer, one part of which was used for color performance test, and the other part was prepared using a universal sample making machine to obtain samples. The limiting oxygen index LOI of the samples was tested according to GB / T2406.2-2009, and the vertical burning performance of the samples was tested according to GB / T 2408-2008.

[0079] result

[0080] 1. Color performance

[0081] The color intensity of the comparative sample 1 is 100%, and the color intensity of the sample 1 is 110%; the color intensity of the comparative sample 2 is 100%, and the color intensity of the sample 2 is 105%; the color intensity of the comparative sample 3 is 100%, and the color intensity of the sample 3 is 106%; the color intensity of the comparative sample 4 is 100%, and the color intensity of the sample 4 is 104%. It can be seen that the coloring ability of the flame retardant phthalocyanine blue pigment provided by the present application is better than that before modification.

[0082] 2. Limiting oxygen index LOI and combustion performance

[0083] The limiting oxygen index LOI of blank sample 1 is 18.0%, and the dripping time is 3.7s;

[0084] The limiting oxygen index LOI of comparative sample 1 is 18.2% and the dripping time is 3.7s;

[0085] The limiting oxygen index LOI of sample 1 is 24% and the dripping time is 35s;

[0086] The limiting oxygen index LOI of blank sample 2 is 18.3%, and the dripping time is 3.9s;

[0087] The limiting oxygen index LOI of comparative sample 2 is 18.1% and the dripping time is 3.7s;

[0088] Sample 2 has a limiting oxygen index LOI of 22% and a dripping time of 28s;

[0089] The limiting oxygen index LOI of blank sample 3 is 18.4%, and the dripping time is 4.0s;

[0090] The limiting oxygen index LOI of comparative sample 3 is 18.5%, and the dripping time is 3.9s;

[0091] The limiting oxygen index LOI of sample 3 is 26%, and the dripping time is 45 s.

[0092] The limiting oxygen index LOI of blank sample 4 is 18.1%, and the dripping time is 3.8s;

[0093] The limiting oxygen index LOI of comparative sample 4 is 18.3%, and the dripping time is 3.9s;

[0094] The limiting oxygen index LOI of sample 4 is 25%, and the dripping time is 43 s.

[0095] It can be seen that the limiting oxygen index LOI and dripping time of the control samples 1-4 and the blank samples 1-4 are not much different, while the limiting oxygen index LOI of the samples 1-4 is significantly improved, and the dripping time is extended by up to 11.5 times, indicating that the flame retardant phthalocyanine blue pigment provided in the present application reduces the flammability of the polymer material, making it have better flame retardant properties and safer.

[0096] The above implementation modes are only used to illustrate the technical solutions of the present invention, but not to limit the present invention. Although the present invention has been described in detail with reference to the above implementation modes, those skilled in the art should understand that any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A flame retardant phthalocyanine blue pigment, characterized in that: It comprises CuPC-MEL-DEA and copper phthalocyanine blue pigment mixed in a set ratio, wherein the structural formula of the CuPC-MEL-DEA is shown in formula (I):

2. The flame retardant phthalocyanine blue pigment according to claim 1, characterized in that: The added amount of CuPC-MEL-DEA accounts for 30-70wt% of the phthalocyanine blue pigment, and the rest is copper phthalocyanine blue pigment.

3. A method for preparing a flame retardant phthalocyanine blue pigment as claimed in claim 1, characterized in that: The following steps are involved: S1. Dissolve copper phthalocyanine in concentrated sulfuric acid, add paraformaldehyde and melamine, stir thoroughly, and keep warm at 65-105°C for 5 hours, wherein the mixing mass ratio of copper phthalocyanine: concentrated sulfuric acid: paraformaldehyde: melamine is (28.8-86.4):(200-500):(4.5-20):(15-65); S2. A mixture of formaldehyde and diethanolamine was added dropwise to the system. After the addition was completed, the mixture was heated for a second time at 65 to 105° C. for 5 hours, then poured into ice water for dilution, filtered, washed, and dried to obtain the target product CuPC-MEL-DEA, wherein the structure of the CuPC-MEL-DEA is shown in formula (I): S3. Fully mix the CuPC-MEL-DEA powder and the copper phthalocyanine blue pigment to obtain a flame retardant phthalocyanine blue pigment.

4. The method for preparing a flame retardant phthalocyanine blue pigment according to claim 3, characterized in that: In step S2, in the mixture, the mass ratio of formaldehyde to diethanolamine is (9.0-40):(25-75), and the mass ratio of the total amount of the added mixture to copper phthalocyanine is (0.5-2.0):

1.

5. The method for preparing a flame retardant phthalocyanine blue pigment according to claim 3, characterized in that: In the step S3, the added amount of CuPC-MEL-DEA accounts for 30-70wt% of the phthalocyanine blue pigment, and the rest is copper phthalocyanine blue pigment.

6. Use of the flame-retardant phthalocyanine blue pigment as claimed in claim 1 in the preparation of flame-retardant polymer materials.

7. The use according to claim 6, characterized in that The polymer material is any one of PP, PE, PS, PET, PVC, PA and PAN or a mixture of several of them.

8. The use according to claim 6, characterized in that The method for preparing the flame-retardant polymer material is to place the dried flame-retardant phthalocyanine blue pigment and polymer material particles in an extruder according to a set ratio for compounding and granulation to obtain the desired flame-retardant polymer material.

9. The use according to claim 8, characterized in that The flame retardant phthalocyanine blue pigment and the polymer material particles are mixed in a mass ratio of (3-9):(91-97).

10. The use according to claim 8, characterized in that The drying condition is to dry at a temperature of 60-105° C. until the moisture content is less than 0.5 wt %.

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