Modified POK material and its preparation method and application in rotational molding process

Abstract

The invention belongs to the technical field of roto-molding materials and processes, and relates to a modified POK material, a preparation method thereof, and an application in a roto-molding process. The formula includes: 100 parts of POK polyketone, 0.1-0.5 parts of antioxidant, 0-1.0 parts of auxiliary antioxidant, 0.3-1.5 parts of ultraviolet absorber, 0-0.5 parts of colorant, and 0-3 parts of dispersing aid; the preparation method includes: grinding POK particles into powder; adding dispersing aid to the powder and stirring; then adding the remaining components and stirring to obtain a modified POK material in powder form. The heat deformation temperature HDT (0.45MPa) of the POK modified material can reach 200-215°C, and the long-term use temperature can reach 120°C. Its performance is better than many engineering plastics in a high temperature environment, and its application field is wider; in terms of low temperature, the POK modified material has excellent low temperature toughness and still has good impact resistance under the working conditions of minus 20-40°C.

Description

Technical Field

[0001] The invention belongs to the technical field of rotational molding materials and processes, and specifically relates to a modified POK material and a preparation method thereof and an application thereof in a rotational molding process. Background Art

[0002] Roto-molding, also known as rotational molding, is a plastic hollow molding method and an important branch of plastic molding technology. In this method, the plastic raw materials are first added to the mold, and then the mold is continuously rotated along two vertical axes by the roto-molding equipment and the mold is heated. Under the action of gravity and heat energy, the plastic raw materials in the mold melt and adhere to the inner wall of the mold cavity, and are evenly coated on the entire surface, forming into the required shape, and then cooled and shaped into a hollow product. In order to adapt to the product processing technology, the raw materials for roto-molding are usually powder-based, and the raw materials need to be fully melted, and are required to have the characteristics of melt viscosity and not easy to decompose at high temperature.

[0003] At present, more than 90% of the raw materials used in the rotational molding industry are polyethylene, followed by a small amount of polypropylene and polyvinyl chloride materials. However, these materials have insufficient high temperature resistance, especially under pressure environments, and the long-term use temperature requirement is lower than 100°C, making it difficult to use them at high temperatures for a long time. In order to meet the use requirements in high temperature environments, nylon materials are selected in some high temperature environments, such as the liquid nylon materials (caprolactam polymerization) in Chinese invention patents CN100355809A, CN108752579A, CN114656630A, and CN114605819A, or the nylon powder materials involved in CN110027150A, CN110027150A, and CN116141557A.

[0004] The existing liquid nylon roto-molding process mostly uses highly toxic isocyanate materials as co-catalysts, which have strict use environments, high environmental risks, and risks of harming the health of manufacturing personnel. It requires the investment of professional chemical plants and equipment. In addition, the anionic ring-opening polymerization reaction time of caprolactam is short and the crystallization temperature range is narrow, making it difficult to set the roto-molding process parameters and control the production process.

[0005] Nylon powder materials for rotational molding are mostly made by grinding nylon 6 particles in a low-temperature environment of liquid nitrogen. Nylon molecules contain many hydroxyl groups (-OH) and amide bonds (-CONH-), which can hydrogen bond with water molecules. When nylon comes into contact with water, water molecules will hydrogen bond with the hydroxyl groups and amide bonds in the nylon molecules, forming a water molecule layer on the surface of the nylon molecules, so that the nylon absorbs water. Hydrogen bonds have low bond energy, are unstable, and are easy to break, which also causes nylon to easily lose bound water after experiencing high temperatures. After absorbing water, the impact strength of nylon products is significantly improved, and the modulus decreases. In order to ensure sufficient impact strength of nylon products, a humidity control process is usually added to the nylon rotational molding products after molding, so that the nylon matrix has a certain moisture content, thereby increasing the toughness of the product, but dehydration will occur in high temperature and dry environment, resulting in large fluctuations in the physical properties of the product, and water absorption and humidity control is time-consuming and energy-consuming, increasing production costs. In addition, the crystallization temperature range of nylon molding is narrow and the molding speed is fast, but the rotational molding process is not easy to accurately control the temperature in the mold, which increases the difficulty of controlling the rotational molding process, resulting in defects such as flow and uneven wall thickness in the rotational molded products. Summary of the invention

[0006] The purpose of the present invention is to solve the above-mentioned problems existing in the prior art, and proposes a modified POK material and a preparation method thereof and an application in a rotational molding process. The modified POK material adopts a new formula to prepare a polyketone (POK) material for rotational molding, and the material is applied to rotational molded products, thereby broadening the application field of rotational molding technology and improving production efficiency.

[0007] The technical solution of the present invention is:

[0008] A modified POK material, the formula of which includes the following components by weight:

[0009] 100 parts of POK polyketone, 0.1-0.5 parts of antioxidant, 0-1.0 parts of auxiliary antioxidant, 0.3-1.5 parts of ultraviolet absorber, 0-0.5 parts of colorant, and 0-3 parts of dispersing aid.

[0010] In the present invention, the amount of antioxidant per 100 parts of POK polyketone is 0.1 to 0.5 parts, for example, it can be 0.1 parts, 0.15 parts, 0.2 parts, 0.25 parts, 0.3 parts, 0.4 parts or 0.5 parts, but is not limited to the listed values, and other unlisted values ​​within the range are also applicable.

[0011] The amount of auxiliary antioxidant is 0 to 1.0 part, for example, it can be 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 or 1.0, but is not limited to the listed values, and other unlisted values ​​within the range are also applicable.

[0012] The amount of ultraviolet absorber is 0.3 to 1.5 parts, for example, it can be 0.3, 0.5, 0.8, 0.9, 1.0, 1.2, 1.3, 1.4 or 1.5 parts, but is not limited to the listed values, and other values ​​not listed within the range are also applicable.

[0013] The number of colorants is 0 to 0.5 parts, for example, it can be 0 parts, 0.1 parts, 0.15 parts, 0.2 parts, 0.25 parts, 0.3 parts, 0.4 parts or 0.5 parts, but is not limited to the listed values, and other unlisted values ​​within the range are also applicable; when the material to be prepared is colorless, no colorant is needed, and the number of colorants is 0 parts; when the material to be prepared is colored, the number of colorants is adjusted according to the color requirements.

[0014] The amount of the dispersing aid is 0 to 3 parts, for example, 0, 0.5, 1, 1.5, 1.8, 2.0, 2.4 or 3.0 parts, but is not limited to the listed values, and other values ​​not listed within the range are also applicable.

[0015] POK belongs to the polyketone material, a high-strength copolymer formed by binary alternating copolymerization of carbon monoxide and ethylene. Propylene is introduced as the third monomer in some uses. It has a highly crystalline crystalline structure and has the main properties of hydrolysis resistance, impact resistance, wear resistance, chemical resistance, fuel resistance, and gas barrier properties.

[0016] In order to meet the requirements of the product use environment or appearance, the present invention modifies the POK polyketone material by adding several of antioxidants, auxiliary antioxidants, ultraviolet absorbers, colorants, and dispersing aids to achieve the modified application of the POK material.

[0017] Furthermore, the POK polyketone is a polyketone material, which is divided into two types: a high-strength fiber copolymer formed by binary alternating copolymerization of carbon monoxide and ethylene and a ternary copolymer with additional use of propylene; it is selected from one or a mixture of the Korean Hyosung pure resin series M330A, JM036, M610A, M620A, M630A, M710F, M730F, and M930A.

[0018] Furthermore, the antioxidant is a phenolic antioxidant, selected from one or more of the antioxidants 2,6-di-tert-butylphenol, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, and 2,2'-methylenebis(4-methyl-6-tert-butylphenol).

[0019] Furthermore, the auxiliary antioxidant is a phosphite, including one or more of TNPP, 168, and DLTDP.

[0020] Furthermore, the ultraviolet absorber is a benzophenone or a benzotriazole, and is selected from any one or both of 2-hydroxy-4-n-octyloxybenzophenone or 2'-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole.

[0021] Furthermore, the colorant is selected from pigments or masterbatches, and the color of the pigments or masterbatches can be selected from any one or more of cadmium red, cadmium yellow, titanium dioxide, carbon black, phthalocyanine blue, phthalocyanine green, phthalocyanine red, light-fast red, macromolecular red, macromolecular yellow, permanent yellow, permanent purple or azo red according to the color requirements of the product.

[0022] Furthermore, the dispersing aid is white wax oil or high-viscosity dimethyl silicone oil.

[0023] The present invention also protects a method for preparing the modified POK material, comprising the following steps:

[0024] Weigh each formula component according to the mass fraction;

[0025] Set the rotation speed to 120-300 r / min and the grinding time to 10-30 min to grind the POK polyketone particles into powder with a particle size of 100-20 mesh;

[0026] When the formula includes a dispersing aid, add the dispersing aid to the POK polyketone powder and stir for 2 to 5 minutes at a stirring speed of 30 to 100 r / min;

[0027] Then, the remaining other components in the formula are added, stirred for 10 to 30 minutes at a stirring rate of 20 to 80 r / min to obtain a modified POK material in powder form.

[0028] The present invention further protects the application of the modified POK material in the field of rotational molding, wherein the modified POK material is in powder form and is used to produce rotational molded products.

[0029] Furthermore, the modified POK material is applied to a rotational molding process, and the process steps include:

[0030] The modified POK material in powder form is added to the product mold, and the mold is continuously rotated along two vertical axes. At the same time, the mold is heated, and the heating temperature is controlled at 240-280°C for 15-35 minutes. Under the action of gravity and heat energy, the POK raw material in the mold gradually melts and adheres to the inner wall of the mold cavity, and is evenly coated on the entire inner wall surface, forming into the required shape, and then cooling and shaping into a hollow product.

[0031] Beneficial effects of the present invention:

[0032] The heat deformation temperature HDT (0.45MPa) of the POK modified material provided by the present invention can reach 200-215°C, and the long-term use temperature can reach 120°C, which is basically consistent with the temperature resistance of nylon. Its performance is better than many engineering plastics in high temperature environments and has a wider application field. In terms of low temperature, the POK modified material has excellent low-temperature toughness and still has good impact resistance under working conditions of minus 20-40°C.

[0033] The rotational molded products produced by modified POK materials are formed and rolled off the production line in one step after cooling, without the need to add a humidity adjustment process, thereby improving product production efficiency and long-term performance stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A flow chart of the preparation method provided in Example 1 of the present invention;

[0035] Figure 2 This is a flow chart of the preparation method provided in Example 4 of the present invention. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In order to further understand the present invention, the present invention will be further described in conjunction with the accompanying drawings and embodiments.

[0038] Example 1

[0039] The formula of the modified POK material provided in this embodiment is formulated according to the following mass fractions:

[0040] 100 parts of POK M730F, 0.4 parts of 2,6-di-tert-butylphenol, 0.3 parts of TNPP, 0.6 parts of 2-hydroxy-4-n-octyloxybenzophenone, 0.1 parts of pigment carbon black, and 1.2 parts of white wax oil.

[0041] A method for preparing a modified POK material comprises the following steps:

[0042] Weigh each formula component according to the above mass fractions;

[0043] POK M730F particles were added to a grinding mill, and ground into powder by the grinding mill. The grinding speed was set to 120 r / min, and the grinding was performed for 15 min to obtain POK M730F powder with a particle size of 100 mesh.

[0044] The ground POK M730F powder was weighed according to the capacity of the mixer, added to the mixer, and white wax oil was added according to the mass ratio. The machine was started and stirred for 5 minutes at a stirring speed of 50 r / min.

[0045] 2,6-di-tert-butylphenol, TNPP, 2-hydroxy-4-n-octyloxybenzophenone and pigment carbon black were added in proportion by mass, and the mixture was stirred for 10 minutes at a stirring rate of 60 r / min to obtain a modified POK material in powder form.

[0046] application:

[0047] The prepared modified POK powder is added to the product mold, and the mold is continuously rotated along two vertical axes. At the same time, the mold is heated. The heating temperature is controlled at 250°C and the heating time is 28 minutes. Under the action of gravity and heat energy, the POK raw material in the mold gradually melts and adheres to the inner wall of the mold cavity, and is evenly coated on the entire inner wall surface, forming into the required shape, cooling for 20 minutes, and finally forming a hollow product with a wall thickness of 4 mm.

[0048] Test Example 1

[0049] The performance of products produced using the same mold and different materials (LLDPE, PA6, and the modified POK material prepared in Example 1) was compared, and the results are shown in Table 1 below:

[0050] Table 1 Comparison of product performances made of different materials

[0051] LLDPE PA6 Modified POK of Example 1 Hardness / D 62 72 75 Tensile strength / MPa 18 60 58 Elongation at break / % 323 22 187 Melting point / ℃ 125 218 222 Heat deformation temperature (0.45MPa) / ℃ 72 190 202 Brittle temperature / ℃ -70 -45 -47

[0052] Example 2

[0053] The formula of the modified POK material provided in this embodiment is formulated according to the following weight proportions:

[0054] 100 parts of POK M330A, 0.3 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, 0.5 parts of auxiliary antioxidant 168, 0.9 parts of 2'-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, 0.2 parts of phthalocyanine green, and 1.5 parts of high-viscosity dimethyl silicone oil.

[0055] A method for preparing a modified POK material comprises the following steps:

[0056] Weigh each formula component according to the above mass fractions;

[0057] POK M330A particles were added to a grinding mill, and ground into powder by the grinding mill. The grinding speed was set to 120 r / min, and the grinding was performed for 10 min to obtain POK M330A powder with a particle size of 80 mesh.

[0058] The ground POK M330A powder was weighed according to the capacity of the mixer, added to the mixer, and high-viscosity dimethyl silicone oil was added according to the mass ratio. The machine was started and stirred for 2 minutes at a stirring speed of 30 r / min.

[0059] Pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate], auxiliary antioxidant 168, 2'-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole and phthalocyanine green were added in proportion by mass, and the mixture was stirred for 15 minutes at a stirring rate of 30 r / min to obtain a modified POK material in powder form.

[0060] application:

[0061] The prepared modified POK powder is added to the product mold, and the mold is continuously rotated along two vertical axes. At the same time, the mold is heated, and the heating temperature is controlled at 240°C for 30 minutes. Under the action of gravity and heat energy, the POK raw material in the mold gradually melts and adheres to the inner wall of the mold cavity, and is evenly coated on the entire inner wall surface, forming into the required shape, cooling for 20 minutes, and finally forming a hollow product with a wall thickness of 3.5 mm.

[0062] Example 3

[0063] The formula of the modified POK material provided in this embodiment is formulated according to the following weight proportions:

[0064] 100 parts of POK JM036, 0.5 parts of β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, 1.0 parts of DLTDP, 1.5 parts of 2-hydroxy-4-n-octyloxybenzophenone, 0.5 parts of pigment carbon black, and 3 parts of white wax oil.

[0065] A method for preparing a modified POK material comprises the following steps:

[0066] Weigh each formula component according to the above mass fractions;

[0067] POK JM036 particles were added to a grinding mill and ground into powder. The grinding speed was set to 100 r / min and the grinding was performed for 30 min to obtain POK JM036 powder with a particle size of 40 mesh.

[0068] The ground POK JM036 powder was weighed according to the capacity of the mixer, added to the mixer, and white wax oil was added according to the mass ratio. The machine was started and stirred for 5 minutes at a stirring speed of 100 r / min.

[0069] Add β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, DLTDP, 2-hydroxy-4-n-octyloxybenzophenone, and pigment carbon black according to the mass ratio, start stirring for 15 minutes at a stirring rate of 50 r / min to obtain a modified POK material in powder form.

[0070] application:

[0071] The prepared modified POK powder is added to the product mold, and the mold is continuously rotated along two vertical axes. At the same time, the mold is heated. The heating temperature is controlled at 265°C and the heating time is 35 minutes. Under the action of gravity and heat energy, the POK raw material in the mold gradually melts and adheres to the inner wall of the mold cavity, and is evenly coated on the entire inner wall surface to be formed into the required shape. After cooling for 25 minutes, it is formed into a hollow product with a wall thickness of 5.5 mm.

[0072] Example 4

[0073] The formula of the modified POK material provided in this embodiment is formulated according to the following weight proportions:

[0074] 100 parts of POK M610A, 0.4 parts of 2,2'-methylenebis(4-methyl-6-tert-butylphenol), 0.6 parts of 2'-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, 0.1 parts of phthalocyanine blue, and 1.2 parts of high-viscosity dimethyl silicone oil.

[0075] A method for preparing a modified POK material comprises the following steps:

[0076] Weigh each formula component according to the above mass fractions;

[0077] POK M610A particles were added to a grinding mill and ground into powder. The grinding speed was set to 210 r / min and the grinding was performed for 20 min to obtain POK M610A powder with a particle size of 40 mesh.

[0078] The ground POK M610A powder was weighed according to the capacity of the mixer, added to the mixer, and high-viscosity dimethyl silicone oil was added according to the mass ratio. The machine was started and stirred for 3 minutes at a stirring speed of 60 r / min.

[0079] 2,2'-methylenebis(4-methyl-6-tert-butylphenol), 2'-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole and phthalocyanine blue were added in proportion by mass, and the mixture was stirred for 22 minutes at a stirring rate of 70 r / min to obtain a modified POK material in powder form.

[0080] application:

[0081] The prepared modified POK powder is added to the product mold, and the mold is continuously rotated along two vertical axes. At the same time, the mold is heated, and the heating temperature is controlled at 250°C for 25 minutes. Under the action of gravity and heat energy, the POK raw material in the mold gradually melts and adheres to the inner wall of the mold cavity, and is evenly coated on the entire inner wall surface, forming into the required shape, cooling for 25 minutes, and finally forming a hollow product with a wall thickness of 5 mm.

[0082] Example 5

[0083] 100 parts of POK M630A, 0.4 parts of 2,6-di-tert-butylphenol, 0.6 parts of 2-hydroxy-4-n-octyloxybenzophenone, and 1.2 parts of white wax oil.

[0084] A method for preparing a modified POK material comprises the following steps:

[0085] Weigh each formula component according to the above mass fractions;

[0086] POK M630A particles were added to a grinding mill, and ground into powder by the grinding mill. The grinding speed was set to 200 r / min, and the grinding was performed for 15 min to obtain POK M630A powder with a particle size of 50 mesh.

[0087] The ground POK M630A powder was weighed according to the capacity of the mixer, added to the mixer, and white wax oil was added according to the mass ratio. The machine was started and stirred for 5 minutes at a stirring speed of 50 r / min.

[0088] 2,6-di-tert-butylphenol and 2-hydroxy-4-n-octyloxybenzophenone were added in proportion by mass, and the mixture was stirred for 10 minutes at a stirring rate of 80 r / min to obtain a modified POK material in powder form.

[0089] application:

[0090] The prepared modified POK powder is added to the product mold, and the mold is continuously rotated along two vertical axes. At the same time, the mold is heated. The heating temperature is controlled at 250°C and the heating time is 22 minutes. Under the action of gravity and heat energy, the POK raw material in the mold gradually melts and adheres to the inner wall of the mold cavity, and is evenly coated on the entire inner wall surface to be formed into the required shape. After cooling for 25 minutes, it is formed into a hollow product with a wall thickness of 4 mm.

[0091] Example 6

[0092] 100 parts of POK M710F, 0.4 parts of 2,6-di-tert-butylphenol, 0.3 parts of DLTDP, 0.6 parts of 2'-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, and 0.1 parts of Permanent Yellow.

[0093] A method for preparing a modified POK material comprises the following steps:

[0094] Weigh each formula component according to the above mass fractions;

[0095] POK M710F particles were added to a grinding mill and ground into powder. The grinding speed was set to 200 r / min and the grinding was performed for 15 min to obtain POK M710F powder with a particle size of 30 mesh.

[0096] The ground POK M710F powder was weighed according to the capacity of the mixer, added to the mixer, and 2,6-di-tert-butylphenol, DLTDP, 2'-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole and Permanent Yellow were added according to the mass ratio. The machine was started and stirred for 15 minutes at a stirring rate of 50 r / min to obtain a modified POK material in powder form.

[0097] application:

[0098] The prepared modified POK powder is added to the product mold, and the mold is continuously rotated along two vertical axes. At the same time, the mold is heated, and the heating temperature is controlled at 250°C for 18 minutes. Under the action of gravity and heat energy, the POK raw material in the mold gradually melts and adheres to the inner wall of the mold cavity, and is evenly coated on the entire inner wall surface, forming into the required shape, cooling for 20 minutes, and finally forming a hollow product with a wall thickness of 4 mm.

[0099] Example 7

[0100] The formula of the modified POK material provided in this embodiment is formulated according to the following weight proportions:

[0101] 100 parts of POK M930A, 0.4 parts of 2,6-di-tert-butylphenol, and 0.6 parts of 2-hydroxy-4-n-octyloxybenzophenone.

[0102] A method for preparing a modified POK material comprises the following steps:

[0103] Weigh each formula component according to the above mass fractions;

[0104] POK M930A particles were added to a grinding mill, and ground into powder by the grinding mill. The grinding speed was set to 200 r / min, and the grinding was performed for 20 min to obtain POK M930A powder with a particle size of 20 mesh.

[0105] The ground POK M930A powder was weighed according to the capacity of the mixer, added to the mixer, and 2,6-di-tert-butylphenol and 2-hydroxy-4-n-octyloxybenzophenone were added according to the mass ratio. The machine was started and stirred for 15 minutes at a stirring rate of 50 r / min to obtain a modified POK material in powder form.

[0106] application:

[0107] The prepared modified POK powder is added to the product mold, and the mold is continuously rotated along two vertical axes. At the same time, the mold is heated. The heating temperature is controlled at 250°C and the heating time is 25 minutes. Under the action of gravity and heat energy, the POK raw material in the mold gradually melts and adheres to the inner wall of the mold cavity, and is evenly coated on the entire inner wall surface, forming into the required shape, cooling for 20 minutes, and finally forming a hollow product with a wall thickness of 4 mm.

[0108] The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments, or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, modification, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A modified POK material for rotational molding, characterized in that: Calculated by weight, its formula Includes the following components: 100 parts of POK polyketone, 0.1-0.5 parts of antioxidant, 0-1.0 parts of auxiliary antioxidant, 0.3-1.5 parts of ultraviolet absorber, 0-0.5 parts of colorant, 0.5-3 parts of dispersing aid; The POK polyketone is selected from one or more of M330A, JM036, M610A, M620A, M630A, M710F, M730F, and M930A; The antioxidant is selected from one or more of the antioxidants 2,6-di-tert-butylphenol, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, and 2,2'-methylenebis(4-methyl-6-tert-butylphenol); The auxiliary antioxidant includes one or more of TNPP, 168, and DLTDP; The dispersing aid is white wax oil or high-viscosity dimethyl silicone oil; The preparation method of the modified POK material comprises the following steps: Weigh each formula component according to the mass fraction; Set the rotation speed to 120-300 r / min and the grinding time to 10-30 min to grind the POK polyketone particles into powder with a particle size of 100-20 mesh; Add dispersing aid to POK polyketone powder, stir for 2-5 minutes, and stir at a speed of 30-100 r / min; Then, the remaining other components in the formula are added, stirred for 10 to 30 minutes at a stirring rate of 20 to 80 r / min to obtain a modified POK material in powder form.

2. The modified POK material according to claim 1, characterized in that: The ultraviolet absorber is selected from any one or both of 2-hydroxy-4-n-octyloxybenzophenone and 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole.

3. The modified POK material according to claim 1, characterized in that: The colorant is selected from pigments or masterbatches, and its colors include cadmium red, cadmium yellow, titanium dioxide, carbon black, phthalocyanine blue, phthalocyanine green, phthalocyanine red, light-fast red, macromolecular red, macromolecular yellow, permanent yellow, permanent violet or azo red.

4. Application of the modified POK material according to any one of claims 1 to 3 in the field of rotational molding, characterized in that: The modified POK material is in powder form and is used for producing rotational molding products.

5. The use according to claim 4, characterized in that: The modified POK material is applied to a rotational molding process, and the process steps include: The modified POK material in powder form is added to the product mold, and the mold is continuously rotated along two vertical axes. At the same time, the mold is heated, and the heating temperature is controlled at 240-280°C for 15-35 minutes. Under the action of gravity and heat energy, the POK raw material in the mold gradually melts and adheres to the inner wall of the mold cavity, and is evenly coated on the entire inner wall surface, forming into the required shape, and then cooling and shaping into a hollow product.

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