A polypropylene material and its preparation method and application

Abstract

The present invention discloses a polypropylene material and a preparation method and application thereof. The polypropylene material comprises the following components by weight: 50-70 parts of polypropylene resin, 5-10 parts of polyolefin elastomer, 0.5-1 parts of red nano-transparent pigment, 8-19 parts of luminescent material, 0.2-0.6 parts of lubricant, and 0.3-0.6 parts of light-resistant agent. The polypropylene material has good luminescence performance and aging resistance.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer materials, and in particular to a polypropylene material and a preparation method and application thereof. Background Art

[0002] Warning materials are typically yellow or red. Currently, polypropylene materials with luminous properties are green and blue, and there are no red luminous materials on the market. Red luminous materials require two conditions: red toner or pigment and a luminescent substance. However, prior art has shown that directly combining red toner or pigment with a luminescent substance can obscure the luminescence, preventing light from reaching the surface. Furthermore, red toner or pigment exhibits poor aging resistance, making it impossible to achieve a luminous effect while meeting light resistance requirements. This ineffective warning system fails to alert users in low-light environments.

[0003] Existing patent CN1328313C discloses a method for obtaining a luminescent polypropylene composition by melt-blending polypropylene, a light-storing luminescent material, and powdered rubber. By combining the luminescent material with the powdered rubber, the dispersion of the luminescent material in the polypropylene material can be effectively improved, the friction during processing can be reduced, and the mechanical properties and luminescent properties of the composition can be improved, thereby obtaining a luminescent polypropylene composition with good toughness.

[0004] However, the polypropylene material in the prior art has poor luminescence performance and poor aging resistance under the premise of emitting red light. Summary of the Invention

[0005] In view of this, the present application provides a polypropylene material and a preparation method and application thereof, which can emit red luminous light and has good luminous performance and aging resistance.

[0006] In order to achieve the above technical objectives, this application adopts the following technical solutions:

[0007] In a first aspect, the present application provides a polypropylene material comprising the following components in parts by mass: 50-70 parts of polypropylene resin, 5-10 parts of polyolefin elastomer, 0.5-1 part of red nano transparent pigment, 8-19 parts of luminescent material, 0.2-0.6 parts of lubricant, and 0.3-0.6 parts of light stabilizer.

[0008] Preferably, the polyolefin elastomer is one or more of ethylene-octene copolymer, ethylene-butene copolymer and ethylene-hexene copolymer.

[0009] Preferably, the red nano transparent pigment comprises 100-120 parts of red transparent color paste, 1-3 parts of antioxidant, 1-3 parts of vinyltrichlorosilane coupling agent, and 0.5-2 parts of metal passivator.

[0010] Preferably, the metal ion passivator includes but is not limited to 1,2-bis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl]hydrazine.

[0011] The preparation method of the red nano transparent pigment is as follows: a commercially available red nano transparent color paste, an antioxidant, a coupling agent and a metal passivator are mixed, and the mixture is stirred at high speed under ultrasonic conditions for 3-5 minutes for use.

[0012] In this scheme, the antioxidant is 2,6-di-tert-butylphenol; and the coupling agent is vinyltrichlorosilane.

[0013] Preferably, the particle size of the red transparent color paste is 45-200 nm, more preferably, the particle size of the red transparent color paste is 100-200 nm.

[0014] Preferably, the mass ratio of the red transparent color paste to the metal passivator is 100:0.5-1.

[0015] Preferably, the luminescent material is a sulfur oxide red light-storage luminescent material with an average particle size of 1-60 μm. More preferably, the luminescent material has an average particle size of 10-30 μm.

[0016] Preferably, the light stabilizer is a mixture of a benzophenone light stabilizer and a hindered amine light stabilizer.

[0017] Benzophenone-based light stabilizers include, but are not limited to, one or more of 2-hydroxy-4-n-octyloxy-benzophenone, and hindered amine-based light stabilizers include, but are not limited to, one or more of poly{[6-[(1,1,3,3-tetramethylbutyl)amino]]-1,3,5-triazine-2,4-[(2,2,6,6,-tetramethyl-piperidinyl)imino]-1,6-hexanediyl[(2,2,6,6-tetramethyl-4-piperidinyl)imino]}.

[0018] Preferably, the mass ratio of the benzophenone-based light stabilizer to the hindered amine-based light stabilizer is 1:1-2.

[0019] Preferably, the melt flow rate of the polypropylene resin is 10-90 g / 10 min. The test standard is ISO 1133-2011, and the test condition is 230° C. / 2.16 kg. The polypropylene resin is a homopolymer polypropylene or a copolymer polypropylene, or a mixture thereof.

[0020] Preferably, the lubricant is one or more of ethylene bisstearamide, polyol ester, and fatty acid ester.

[0021] In a second aspect, the present application provides a method for preparing a polypropylene material, comprising the following steps: mixing and stirring a polypropylene resin, a polyolefin elastomer, a luminescent material, a lubricant, and a light-resistant agent, and then adding a red nano-transparent pigment into a twin-screw extruder for granulation.

[0022] Specifically, 50-70 parts of polypropylene resin, 5-10 parts of polyolefin elastomer, 8-19 parts of luminescent material, 0.2-0.6 parts of lubricant, and 0.3-0.6 parts of light stabilizer are mixed in a high-speed mixer at a speed of 500-600rpm for 3-6 minutes and then fed into a twin-screw extruder. 0.5-1 parts of red nano-transparent pigment are added to the above materials through a liquid metering pump according to the formula ratio and then fed into a twin-screw extruder for granulation. The temperature of the twin-screw extruder conveying section is 160°C to 180°C, the temperature of the melt mixing section is 190°C to 220°C, the temperature of the exhaust and homogenization section is 190°C to 230°C, the screw speed is 400-600rpm, and the double vacuum negative pressure is controlled at above -0.06. After extrusion and granulation, the product of the present invention can be obtained.

[0023] In a third aspect, the present application provides a polypropylene material for use in red luminous products, including but not limited to electrical appliances and car interiors with warning requirements.

[0024] The beneficial effects of the present application are as follows: the red nano transparent pigment of the present scheme is conducive to the penetration of light of the red luminescent material, so that it can still emit red luminous light in a poor light environment, and the two work together to achieve good luminous performance; at the same time, the components of the red nano transparent pigment are formulated to solve the problem of poor aging resistance of the red transparent color paste, improve the aging resistance of the overall polypropylene material, and have good luminous performance. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0026] The raw materials in the examples and comparative examples of this scheme are shown in the following table: The scheme is further illustrated by specific examples below.

[0027] Table 1 Source of raw materials

[0028]

[0029]

[0030] Ingredients Description:

[0031] Among the luminescent materials, the chemical structures of sulfur oxide red light-storage type luminescent material-1, sulfur oxide red light-storage type luminescent material-2, sulfur oxide red light-storage type luminescent material-3, and sulfur oxide red light-storage type luminescent material-4 differ only in their particle sizes;

[0032] The lubricant is ethylene bisstearamide.

[0033] Table 2 Preparation of red transparent pigment

[0034]

[0035] Examples 1-11 and Comparative Examples 1-2

[0036] A polypropylene material comprises the components listed in Table 1 in their respective mass fractions. The preparation method comprises: first, mixing a luminescent material and a metal ion passivator in a high-speed mixer at 500 rpm for 3 minutes; then, adding a polypropylene resin, a lubricant, and a compounded lightfastness agent in the high-speed mixer in the respective proportions; mixing at the same speed for 3 minutes; and then feeding the mixture into a twin-screw extruder. A self-made nano-transparent pigment is then fed into a twin-screw extruder along with the above materials via a liquid metering pump in the formulated proportions for granulation. The temperature of the twin-screw extruder conveying section is 160°C, the temperature of the melt mixing section is 190°C, the temperature of the exhaust and homogenization section is 230°C, the screw speed is 600 rpm, and the double vacuum negative pressure is controlled at or above -0.06. The material is obtained after extrusion and granulation.

[0037] Table 3 Component formulation of each polypropylene material

[0038]

[0039]

[0040] Evaluation Test

[0041] The luminescence performance and aging resistance of the polypropylene materials obtained in Examples 1-11 and Comparative Examples 1-2 were tested, and the results are shown in Table 2.

[0042] Luminous Performance Test Method: Place the prepared sample (100mm x 100mm) in a D65 light source box and illuminate continuously for 30 minutes at a distance of 15cm. Then, measure the luminous intensity in a darkroom using a colorimeter. Irradiance: 1.25W / (m²·nm) @ 420nm; Continuous Illumination; Black Standard Temperature: (100±2)°C; Relative Humidity: (50±5)%; Inner Filter: Borosilicate Glass; Outer Filter: Soda-Lime Glass.

[0043] Light aging test method: According to GB / T16422-2022 interior material light aging test, the light exposure time is 500 hours. The samples after aging are compared with those before aging. The higher the level, the smaller the change. The details are as follows;

[0044] Level 5 – Grayscale ≥ 4 / 5; Level 4 – Grayscale change 4 levels; Level 3 – Grayscale change 3 levels; Level 2 – Grayscale change 2 levels. Gray card grades refer to ISO105 A02 1993.

[0045] Table 4 Test results

[0046]

[0047]

[0048] It can be seen from the data of Example 2 and Comparative Example 2 that when the red transparent paste exceeds the specified dosage, its brightness is reduced, and the color of the sample changes significantly after aging, and the aging resistance is poor; it can be seen from the data of Example 1 that when the component does not contain red transparent paste and only contains luminescent material, its brightness will also be reduced, and its brightness will drop significantly after light aging, and the color of the sample after aging changes significantly; this shows that the red transparent paste in this scheme can improve the brightness of the material within the specified dosage range and has good aging resistance.

[0049] The above are only preferred specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or replacements that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.

Claims

1. A polypropylene material, characterized in that: The invention comprises the following components in parts by mass: 50-70 parts of polypropylene resin, 5-10 parts of polyolefin elastomer, 0.5-1 parts of red nano transparent pigment, 8-19 parts of luminescent material, 0.2-0.6 parts of lubricant, and 0.3-0.6 parts of light-resistant agent; The red nano transparent pigment is composed of 100-120 parts of red transparent color paste, 1-3 parts of antioxidant, 1-3 parts of vinyl trichlorosilane coupling agent, and 0.5-2 parts of metal passivator; The luminescent material is a sulfur oxide red light-storage luminescent material with an average particle size of 10-30 μm; The light stabilizer is a mixture of a benzophenone light stabilizer and a hindered amine light stabilizer.

2. The polypropylene material according to claim 1, characterized in that The particle size of the red transparent color paste is 45-205 nm.

3. The polypropylene material according to claim 1, characterized in that The mass ratio of the red transparent color paste to the metal passivator is 100:0.5-1.

4. The polypropylene material according to claim 1, characterized in that The mass ratio of the benzophenone light stabilizer to the hindered amine light stabilizer is 1:1-2.

5. The polypropylene material according to claim 1, characterized in that The melt flow rate of polypropylene resin is 10-90 g / 10 min, the test standard is ISO 1133-2011, and the test conditions are 230°C / 2.16KG.

6. A method for preparing the polypropylene material according to any one of claims 1 to 5, characterized in that: The method comprises the following steps: mixing polypropylene resin, polyolefin elastomer, luminescent material, lubricant and light-resistant agent, adding red nano transparent pigment and granulating the mixture into a twin-screw extruder.

7. Use of the polypropylene material according to any one of claims 1 to 5 as a red luminous product.

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