Polypropylene light-transmitting material as well as preparation method and application thereof

Abstract

The invention relates to the field of polypropylene composite materials, and particularly discloses a polypropylene light-transmitting material as well as a preparation method and application thereof. The polypropylene light-transmitting material disclosed by the invention is prepared from the following components: homo-polypropylene MN90B, homo-polypropylene V30G, 25 to 29 parts of rubber G1657, 20 to 24 parts of magnesium sulfate whisker, 1 to 3 parts of a regulator, 0.1 to 0.3 part of an antioxidant, 0.2 to 0.4 part of a lubricant, 0.08 to 0.12 part of an ultraviolet absorbent, 0.1 to 0.3 part of a light stabilizer and 0.5 to 0.7 part of a light transmittance improver. The conditioning agent is formed by mixing polyolefin and a Lotader AX8700 toughening agent; the light transmittance improver is formed by mixing a sorbitol nucleating agent and an organic silicon nucleating agent. According to the technical scheme, the polypropylene light-transmitting material with excellent mechanical performance and optical performance is prepared.

Description

Technical Field

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

[0002] Currently, national automotive industry standards have strict requirements for the performance of bumper materials. Materials such as PMMA / PC alloys, due to their high light transmittance, dominate automotive decorative structural components. However, the high cost of PMMA / PC alloys limits their adoption in cost-sensitive applications.

[0003] To reduce costs, some manufacturers have attempted to modify these materials using other plastics. However, maintaining both high mechanical properties and high light transmittance is often difficult, leading to an irreconcilable performance-cost trade-off. With consumers' growing demands for vehicle exterior design and their emphasis on cost control, developing a light-transmitting material that meets performance requirements while reducing production costs has become a pressing technical challenge. Summary of the Invention

[0004] In order to solve the above technical problems, the present application provides a polypropylene light-transmitting material and a preparation method and application thereof.

[0005] In the first aspect, the present application provides a polypropylene translucent material, specifically comprising the following components in parts by weight: 28-32 parts of homopolypropylene MN90B with a melt index of 80-120 g / 10min, 18-22 parts of homopolypropylene V30G with a melt index of 15-25 g / 10min, 25-29 parts of rubber G1657, 20-24 parts of magnesium sulfate whiskers, 1-3 parts of a regulator, 0.1-0.3 parts of an antioxidant, 0.2-0.4 parts of a lubricant, 0.08-0.12 parts of an ultraviolet absorber, 0.1-0.3 parts of a light stabilizer, and 0.5-0.7 parts of a transmittance improver; the regulator is composed of a mixture of polyolefin and Lotader AX8700 toughening agent in a weight ratio of 10-15:1-3; the transmittance improver is composed of a mixture of a sorbitol nucleating agent and a silicone nucleating agent in a weight ratio of 1-5:1-5.

[0006] In the technical solution provided in this application, homopolymer polypropylene MN90B and V30G of specific specifications are selected as the main components of the polypropylene translucent material to provide structural strength and basic transmittance; by adjusting the ratio of MN90B to V30G, the balance between the rigidity and toughness of the material can be optimized to meet the requirements of mechanical performance; in addition, homopolymer polypropylene has a high degree of crystallinity and usually forms larger spherulites, which can increase light scattering, that is, increase haze. MN90B and V30G have different molecular weight distributions or stereoregularities. Blending the two can change the crystallization kinetics, form a heterogeneous crystal structure, increase the light scattering path, and improve the haze.

[0007] Rubber enhances the bumper's impact resistance and provides elasticity; by matching rubber G1657, even better mechanical performance synergy can be achieved. Magnesium sulfate whiskers, as a reinforcing agent, effectively improve the mechanical properties and thermal stability of polypropylene. Antioxidants prevent oxidative degradation of polypropylene during processing and use; by selecting a high-efficiency antioxidant combination, the bumper's service life can be extended. Lubricants improve polypropylene's mold release properties and surface finish. UV absorbers and light stabilizers protect polypropylene from UV damage, enhancing outdoor weather resistance.

[0008] The function of the modifier is to adjust the molecular weight distribution and melting behavior of polypropylene. The addition of polyolefins can enhance the overall mechanical properties of the material, including tensile strength and flexural strength. At the same time, the addition of polyolefins can also increase the modulus of polypropylene, making it harder and more durable. Lotader AX8700 toughening agent can significantly improve the toughness and impact resistance of polypropylene materials, allowing polypropylene to better absorb energy when subjected to external forces, thereby reducing the possibility of cracking and damage. In terms of light transmittance and haze, the synergistic use of polyolefins and Lotader AX8700 can further improve its haze by optimizing the crystal structure and molecular arrangement of polypropylene. At the same time, it can improve the compatibility between polypropylene and inorganic fillers and other raw materials, avoiding excessive decrease in light transmittance due to phase separation.

[0009] The function of the transmittance modifier is to enhance the transmittance and gloss of polypropylene; sorbitol nucleating agent is a classic nucleating agent for polypropylene transmittance modification, which refines the spherulite size by forming homogeneous nucleation points, significantly improving the transmittance and haze; silicone nucleating agents have both transmittance modification and lubrication effects. This application optimizes the crystal morphology through the nucleating agent and combines the synergistic effect of the regulator to balance the transmittance and mechanical properties of the polypropylene material.

[0010] Preferably, the polypropylene translucent material specifically includes the following components in parts by weight: 29-31 parts of homopolypropylene MN90B with a melt index of 80-120 g / 10min, 19-21 parts of homopolypropylene V30G with a melt index of 15-25 g / 10min, 26-28 parts of rubber G1657, 21-23 parts of magnesium sulfate whiskers, 1.5-2.5 parts of a regulator, 0.15-0.25 parts of an antioxidant, 0.25-0.35 parts of a lubricant, 0.09-0.11 parts of an ultraviolet absorber, 0.15-0.25 parts of a light stabilizer, and 0.55-0.65 parts of a transmittance improver.

[0011] Preferably, the regulator is composed of a mixture of polyolefin and Lotader AX8700 toughening agent in a weight ratio of 11-14:1.5-2.5.

[0012] Preferably, in the regulator, the polyolefin is selected from Versify TM One or more of POE 8200, POE 8880, LC675, and SK8730L.

[0013] Preferably, the transmittance improver is composed of a mixture of a sorbitol nucleating agent and an organosilicon nucleating agent in a weight ratio of 1-2:3-5.

[0014] Preferably, the sorbitol nucleating agent is NX8000K dibenzylidene sorbitol nucleating agent; the organosilicon nucleating agent is selected from Dow MB50-001, R972, 120. One or more of 3988.

[0015] Preferably, the performance parameters of the magnesium sulfate whiskers are: diameter 1-2 μm, aspect ratio 30-36:1, purity ≥98%, bulk density 0.20-0.23 g / cm 3 , the microstructure is needle-shaped; the lubricant is selected from one or more of zinc stearate and calcium stearate.

[0016] Preferably, the antioxidant is composed of a mixture of antioxidant 1010 and antioxidant 168 at a weight ratio of 0.5-1.5:0.5-1.5.

[0017] In a second aspect, the present application provides a method for preparing the above-mentioned polypropylene light-transmitting material, which specifically comprises the following steps in sequence: Homopolypropylene MN90B, homopolypropylene V30G, rubber, regulator, antioxidant, lubricant, UV absorber, light stabilizer, and transmittance improver are added to a screw extruder from a main feed port; magnesium sulfate whiskers are fed into the screw extruder from a side feed device; and a polypropylene light-transmitting material is obtained through melt extrusion and drying. The temperature settings of the screw extruder are as follows: zone 1 170-190°C, zone 2 180-195°C, zone 3 200-230°C, die head temperature 215-230°C, screw speed 350-450r / min; feeding rate 30-45kg / h.

[0018] In a third aspect, the present application provides the application of the above-mentioned polypropylene light-transmitting material in automobile bumper materials.

[0019] The polypropylene translucent material provided in this application has excellent high haze performance. When used on a translucent bumper with an LED light source on the back of the component, it can effectively reduce the phenomenon of seeing the light source point from the appearance and improve the texture.

[0020] In summary, the technical solution of this application has the following effects: This application selects homopolypropylene MN90B, homopolypropylene V30G, and rubber G1657 as the main ingredients, adds magnesium sulfate whiskers, and mixes polyolefins and Lotader AX8700 toughening agent to form a regulator, selects sorbitol nucleating agent and silicone nucleating agent to mix to form a transmittance improver, and combines them with antioxidants, zinc stearate lubricants, ultraviolet absorbers, and light stabilizers in specific amounts to prepare a polypropylene material with excellent light transmittance, haze and mechanical properties. DETAILED DESCRIPTION

[0021] The present application is further described in detail below in conjunction with examples, comparative examples and performance testing experiments. These examples should not be construed as limiting the scope of protection claimed in this application. Example

[0022] Examples 1-5 Examples 1-5 respectively provide a polypropylene light-transmitting material and a preparation method thereof.

[0023] The difference between the above embodiments is that the amounts of the raw material components in the polypropylene light-transmitting material are different, as shown in Table 1.

[0024] The preparation method of the polypropylene light-transmitting material in the above embodiment is specifically as follows.

[0025] According to Table 1, weigh the corresponding weights of the raw material components respectively; SK8730L polyolefin and Lotader AX8700 toughening agent were mixed in a high-speed mixer at a weight ratio of 13:2 for 3 minutes to obtain a conditioning agent; Take homopolymer polypropylene MN90B with a melt index of 100g / 10min, homopolymer polypropylene V30G with a melt index of 20g / 10min, rubber G1657 (SEBS elastomer), regulator, antioxidant (composed of a mixture of antioxidant 1010 and antioxidant 168 in a weight ratio of 1:1), zinc stearate lubricant, ultraviolet absorber SUNV5540, light stabilizer UV70DF, transmittance improver (composed of a nucleating agent NX8000K dibenzylidene sorbitol in a weight ratio of 1.5:4, R972 organic silicon nucleating agent mixture) was mixed in a high-speed mixer for 8 minutes and fed into a screw extruder from the main feeding device; Magnesium sulfate whisker NP-YW2 (diameter 1.5 μm, aspect ratio 30-36:1, purity 99%, bulk density 0.22 g / cm 3 , the microstructure is needle-shaped) is fed into the screw extruder from the side feeding device; The mixture is melt-extruded through a screw extruder and dried to obtain a polypropylene light-transmitting material; The temperature settings of the twin-screw extruder are as follows: zone 1 180°C, zone 2 190°C, zone 3 220°C, die head temperature 220°C, screw speed 400r / min; and feed rate 35kg / h.

[0026] Table 1 Amount of each raw material component in the polypropylene light-transmitting material in Examples 1-5 and Comparative Examples 1-2 Examples 6-10 Examples 6-10 respectively provide a polypropylene light-transmitting material and a preparation method thereof.

[0027] The difference between the above embodiment and embodiment 3 is that the type of regulator is different, as shown below.

[0028] In Example 6, the regulator is composed of a mixture of POE 8880 polyolefin and Lotader AX8700 toughening agent in a weight ratio of 13:2.

[0029] In Example 7, the regulator is composed of a mixture of LC675 polyolefin and Lotader AX8700 toughening agent in a weight ratio of 13:2.

[0030] In Example 8, the regulator is composed of a mixture of SK8730L polyolefin and Lotader AX8700 toughening agent in a weight ratio of 10:3.

[0031] In Example 9, the regulator is composed of a mixture of SK8730L polyolefin and Lotader AX8700 toughening agent in a weight ratio of 11:2.5.

[0032] In Example 10, the regulator is composed of a mixture of SK8730L polyolefin and Lotader AX8700 toughening agent in a weight ratio of 14:1.5.

[0033] The other process parameters in the above embodiment are the same as those in Example 3.

[0034] Examples 11-16 Examples 11-16 respectively provide a polypropylene light-transmitting material and a preparation method thereof.

[0035] The difference between the above embodiment and embodiment 3 is that the types of transmittance modifiers are different, as shown below.

[0036] In Example 11, the transmittance modifier is composed of NX8000K dibenzylidene sorbitol nucleating agent, Dow MB50-001 silicone nucleating agent mixed composition.

[0037] In Example 12, the transmittance improver is composed of NX8000K dibenzylidene sorbitol nucleating agent at a weight ratio of 1.5:4, 3988 organic silicon nucleating agent mixed composition.

[0038] In Example 13, the transmittance improver is composed of NX8000K dibenzylidene sorbitol nucleating agent at a weight ratio of 4:1.5, R972 organic silicon nucleating agent mixed composition.

[0039] In Example 14, the transmittance improver is composed of NX8000K dibenzylidene sorbitol nucleating agent at a weight ratio of 1:1, R972 organic silicon nucleating agent mixed composition.

[0040] In Example 15, the transmittance improver is composed of NX8000K dibenzylidene sorbitol nucleating agent at a weight ratio of 1:5, R972 organic silicon nucleating agent mixed composition.

[0041] In Example 16, the transmittance improver is composed of NX8000K dibenzylidene sorbitol nucleating agent at a weight ratio of 2:3, R972 organic silicon nucleating agent mixed composition.

[0042] The other process parameters in the above embodiment are the same as those in Example 3.

[0043] Comparative Example Comparative Example 1-2 Comparative Examples 1-2 respectively provide a polypropylene light-transmitting material and a preparation method thereof.

[0044] The difference between the comparative example and Example 3 is that the amounts of the raw material components in the polypropylene light-transmitting material are different, as shown in Table 1.

[0045] The other process parameters in the above comparative example are the same as those in Example 1.

[0046] Comparative Examples 3-7 Comparative Examples 3-7 respectively provide a polypropylene light-transmitting material and a preparation method thereof.

[0047] The differences between the above comparative example and Example 3 are specifically as follows.

[0048] In Comparative Example 3, an equal amount of copolymerized polypropylene BEW03A having a melt index of 100 g / 10 min was used instead of homopolymerized polypropylene MN90B.

[0049] In Comparative Example 4, the amount of homopolypropylene MN90B with a melt index of 100 g / 10 min is 20 parts, and the amount of homopolypropylene V30G with a melt index of 20 g / 10 min is 30 parts.

[0050] In Comparative Example 5, an equal amount of rubber LC670 was used to replace rubber G1657.

[0051] In Comparative Example 6, the regulator is composed of a mixture of SK8730L polyolefin and Elvaloy 4924 toughening agent in a weight ratio of 13:2.

[0052] In Comparative Example 7, the regulator is composed of a mixture of SK8730L polyolefin and Lotader AX8700 toughening agent in a weight ratio of 2:13.

[0053] The other process parameters in the above comparative example are the same as those in Example 1.

[0054] Performance testing Tensile strength (yield strength) and elongation at break: tested in accordance with ISO 527, 50 mm / min. Test specimen: injection molded ISO A type polypropylene light-transmitting material specimen.

[0055] Tensile modulus: Tested in accordance with ISO 527, 2 mm / min; Test specimen: Injection molded ISO A type polypropylene light-transmitting material specimen.

[0056] Flexural strength and flexural modulus: tested in accordance with the method specified in ISO 178. Test specimen: injection molded ISO A-type polypropylene light-transmitting material specimen.

[0057] Charpy notched impact (two temperatures: 23°C and -30°C): Tested in accordance with ISO 179. Test specimen: Injection molded 80mm x 10mm x 4mm A-notch polypropylene light-transmitting material specimen.

[0058] Light transmittance: Light transmittance is tested in accordance with GB / T 2410-2008. Test specimen: A polypropylene light-transmitting material disc specimen with a diameter of 50 mm and a thickness of 2 mm, which is injection molded.

[0059] Haze: Haze is tested in accordance with GB / T 2410-2008. Test specimen: A polypropylene light-transmitting material disc sample with a diameter of 50 mm and a thickness of 2 mm, which is injection molded.

[0060] Test results: as shown in Table 2.

[0061] Table 2 Performance test results of polypropylene light-transmitting materials in Examples and Comparative Examples From the test results in the above table, it can be seen that the polypropylene light-transmitting material prepared by using the technical solution provided by the present application has excellent mechanical and optical properties.

[0062] By comparing the test results of Examples 1-5 and Comparative Examples 1-2, it can be seen that the relationship between the amounts of each raw material component has a significant impact on the performance of the polypropylene light-transmitting material product. By screening and optimizing the amounts of each raw material component, the polypropylene light-transmitting material prepared in this application has excellent mechanical and optical properties.

[0063] In Comparative Example 3, an equal amount of copolymerized polypropylene BEW03A with a melt index of 100 g / 10 min is used instead of homopolypropylene MN90B. In Comparative Example 4, the amount of homopolypropylene MN90B with a melt index of 100 g / 10 min is 20 parts, and the amount of homopolypropylene V30G with a melt index of 20 g / 10 min is 30 parts. In Comparative Example 5, an equal amount of rubber LC670 is used instead of rubber G1657, and the performance of the prepared polypropylene light-transmitting material is poor. In comparison, the embodiment of the present application uses 28-32 parts of homopolypropylene MN90B with a melt index of 80-120 g / 10 min, 18-22 parts of homopolypropylene V30G with a melt index of 15-25 g / 10 min, and 25-29 parts of rubber G1657 as the main ingredients, and the performance of the prepared polypropylene light-transmitting material is excellent.

[0064] By comparing the test results of Examples 3, 6-10, and Comparative Examples 6-9, the present application selects a polypropylene light-transmitting material prepared by mixing a polyolefin and a Lotader AX8700 toughening agent in a weight ratio of 10-15:1-3 to form a regulator, and the performance is excellent.

[0065] By comparing Examples 3 and 11-13, the present application selects a transmittance improver composed of a mixture of a sorbitol nucleating agent and a silicone nucleating agent in a weight ratio of 1-5:1-5, thereby further improving the performance of the polypropylene light-transmitting material.

[0066] Although the present invention has been described in detail above using general descriptions and specific embodiments, it will be apparent to those skilled in the art that modifications and improvements may be made based on the present invention. Therefore, such modifications and improvements, which do not depart from the spirit of the present invention, are intended to be within the scope of protection claimed herein.

Claims

1. A polypropylene light-transmitting material, characterized in that: Specifically, it includes the following components in parts by weight: 28-32 parts of homopolypropylene MN90B with a melt index of 80-120 g / 10 min, 18-22 parts of homopolypropylene V30G with a melt index of 15-25 g / 10 min, 25-29 parts of rubber G1657, 20-24 parts of magnesium sulfate whiskers, 1-3 parts of a regulator, 0.1-0.3 parts of an antioxidant, 0.2-0.4 parts of a lubricant, 0.08-0.12 parts of an ultraviolet absorber, 0.1-0.3 parts of a light stabilizer, and 0.5-0.7 parts of a transmittance improver; The regulator is composed of a mixture of polyolefin and Lotader AX8700 toughening agent in a weight ratio of 10-15:1-3; the transmittance improver is composed of a mixture of sorbitol nucleating agent and organic silicon nucleating agent in a weight ratio of 1-5:1-5.

2. The polypropylene light-transmitting material according to claim 1, characterized in that: Specifically, it includes the following components in parts by weight: 29-31 parts of homopolypropylene MN90B with a melt index of 80-120 g / 10min, 19-21 parts of homopolypropylene V30G with a melt index of 15-25 g / 10min, 26-28 parts of rubber G1657, 21-23 parts of magnesium sulfate whiskers, 1.5-2.5 parts of a regulator, 0.15-0.25 parts of an antioxidant, 0.25-0.35 parts of a lubricant, 0.09-0.11 parts of an ultraviolet absorber, 0.15-0.25 parts of a light stabilizer, and 0.55-0.65 parts of a transmittance improver.

3. The polypropylene light-transmitting material according to claim 1, characterized in that: The regulator is composed of a mixture of polyolefin and Lotader AX8700 toughening agent in a weight ratio of 11-14:1.5-2.

5.

4. The polypropylene light-transmitting material according to claim 1, characterized in that: In the regulator, the polyolefin is selected from one or more of Versify™ POE 8200, POE 8880, LC675, and SK8730L.

5. The polypropylene light-transmitting material according to claim 1, characterized in that: The light transmittance improver is composed of a mixture of a sorbitol nucleating agent and an organosilicon nucleating agent in a weight ratio of 1-2:3-5.

6. The polypropylene light-transmitting material according to claim 1, characterized in that: The sorbitol nucleating agent is NX8000K dibenzylidene sorbitol nucleating agent; the silicone nucleating agent is selected from one or more of Dow Corning® MB50-001, Aerosil® R972, Tospearl® 120, and Millad® 3988.

7. The polypropylene light-transmitting material according to claim 1, characterized in that: The performance parameters of the magnesium sulfate whiskers are: diameter of 1-2 μm, aspect ratio of 30-36:1, purity ≥98%, and bulk density of 0.20-0.24 g / cm 3 , the microstructure is needle-shaped; the lubricant is selected from one or more of zinc stearate and calcium stearate.

8. The polypropylene light-transmitting material according to claim 1, characterized in that: The antioxidant is composed of a mixture of antioxidant 1010 and antioxidant 168 at a weight ratio of 0.5-1.5:0.5-1.

5.

9. The method for preparing the polypropylene light-transmitting material according to any one of claims 1 to 8, characterized in that: Specifically, the following steps are performed in sequence: Homopolypropylene MN90B, homopolypropylene V30G, rubber, regulator, antioxidant, lubricant, UV absorber, light stabilizer, and transmittance improver are added to a screw extruder from a main feed port; magnesium sulfate whiskers are fed into the screw extruder from a side feed device; and a polypropylene light-transmitting material is obtained through melt extrusion and drying. The temperature settings of the screw extruder are as follows: zone 1 170-190°C, zone 2 180-195°C, zone 3 200-230°C, die head temperature 215-230°C, screw speed 350-450r / min; feeding rate 30-45kg / h.

10. Use of the polypropylene light-transmitting material according to any one of claims 1 to 8 in automobile bumper materials.

Images