Polypropylene light-transmitting material and preparation method and application thereof

Abstract

The application relates to the field of polypropylene composite materials, and particularly discloses a polypropylene light-transmitting material and a preparation method and application thereof. The polypropylene light-transmitting material disclosed by the application comprises the following components: homopolymer polypropylene MN90B, homopolymer polypropylene V30G, 25-29 parts of rubber G1657, 20-24 parts of magnesium sulfate whiskers, 1-3 parts of an adjusting agent, 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 light-transmittance improver; the adjusting agent is composed of polyolefin and Lotader AX8700 toughening agent; and the light-transmittance improver is composed of sorbitol nucleating agent and organic silicon nucleating agent. The polypropylene light-transmitting material prepared through the technical scheme has excellent mechanical properties and optical properties.

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

[0002] Currently, the national standards for the automotive industry have strict regulations on the performance of bumper materials, and materials represented by PMMA / PC alloy materials dominate in automotive decorative structural parts due to their high light transmittance. However, the cost of PMMA / PC alloy materials is relatively high, which limits their promotion in cost-sensitive applications.

[0003] To reduce costs, some manufacturers have attempted to use other plastics for modification, but it is often difficult to maintain high mechanical properties and high light transmittance at the same time, resulting in a difficult trade-off between performance and cost. With the growing demand of consumers for vehicle appearance design and the emphasis on cost control, developing a light-transmitting material that can meet performance requirements and reduce production costs has become an urgent technical issue. SUMMARY

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

[0005] In a first aspect, the present application provides a polypropylene light-transmitting material, specifically comprising the following components 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 modifier, 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 light transmittance improver; the modifier is composed of a mixture of polyolefin and Lotader AX8700 toughening agent in a weight ratio of 10-15:1-3; and the light 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.

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

[0007] Rubber can enhance the impact resistance of the bumper and provide elasticity; by matching and selecting rubber G1657, better mechanical performance synergistic effect can be achieved. Magnesium sulfate whiskers as reinforcing agents can effectively improve the mechanical properties and thermal stability of polypropylene. Antioxidants can prevent the oxidation and degradation of polypropylene during processing and use; by selecting a combination of high-efficiency antioxidants, the service life of the bumper can be prolonged. The role of lubricants is to improve the demolding performance and surface finish of polypropylene. Ultraviolet absorbers and light stabilizers can protect polypropylene from ultraviolet damage and improve outdoor weather resistance.

[0008] The role of the regulator is to adjust the molecular weight distribution and melting behavior of polypropylene; the addition of polyolefin can enhance the overall mechanical properties of the material, including tensile strength, bending strength, etc.; at the same time, the addition of polyolefin can also increase the modulus of polypropylene, making it more rigid and durable; the Lotader AX8700 toughening agent can significantly improve the toughness and impact resistance of the polypropylene material, and can make the polypropylene better absorb energy when subjected to external impact, thereby reducing the possibility of rupture and damage. In terms of light transmittance and haze, the synergistic use of polyolefin and Lotader AX8700 can further improve the haze of polypropylene by optimizing the crystalline structure and molecular arrangement of polypropylene; at the same time, it can improve the compatibility between polypropylene and inorganic fillers, other raw materials, and avoid excessive reduction in light transmittance caused by phase separation.

[0009] The role of the light transmittance modifier is to enhance the light transmittance and gloss of polypropylene; sorbitol nucleating agent is a classic nucleating agent for light transmission modification of polypropylene, which can significantly improve the light transmittance and haze by forming homogeneous nucleation points to refine the spherulite size; the organic silicon nucleating agent has both light transmission modification and lubrication effects, and the application can balance the light transmittance and mechanical properties of the polypropylene material by optimizing the crystalline morphology of the nucleating agent and the synergistic effect of the regulator.

[0010] Preferably, the polypropylene light-transmitting material comprises the following components by weight: 29-31 parts of homopolymer polypropylene MN90B with a melt index of 80-120 g / 10 min, 19-21 parts of homopolymer polypropylene V30G with a melt index of 15-25 g / 10 min, 26-28 parts of rubber G1657, 21-23 parts of magnesium sulfate whiskers, 1.5-2.5 parts of a modifier, 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 light transmittance improver.

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

[0012] Preferably, in the modifier, the polyolefin is selected from Versify TM POE 8200, POE 8880, LC675, SK8730L.

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

[0014] Preferably, the sorbitol nucleating agent is NX8000K dibenzyl sorbitol nucleating agent, and the silicone nucleating agent is selected from Dow MB50-001, R972, 120, 3988.

[0015] Preferably, the magnesium sulfate whisker has the following performance parameters: a diameter of 1-2 μm, an aspect ratio of 30-36:1, a purity of ≥98%, and a bulk density of 0.20-0.23 g / cm 3 , and a microstructure in the form of needles; and the lubricant is selected from one or more of zinc stearate and calcium stearate.

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

[0017] In a second aspect, the application provides a preparation method of the above-mentioned polypropylene light-transmitting material, which specifically comprises the following steps in sequence:

[0018] The homopolypropylene MN90B, the homopolypropylene V30G, rubber, a regulator, an antioxidant, a lubricant, an ultraviolet absorber, a light stabilizer, and a light transmittance improver are added into a screw extruder from a main feeding port; the magnesium sulfate whisker is fed into the screw extruder from a side feeding device; and the polypropylene light-transmitting material is obtained through melting extrusion and drying.

[0019] The temperature of the screw extruder is set as follows: 170-190 DEG C in the first zone, 180-195 DEG C in the second zone, 200-230 DEG C in the third zone, 215-230 DEG C in the die head, and 350-450 r / min of screw rotation speed; and the feeding speed is 30-45 kg / h.

[0020] In a third aspect, the application provides an application of the polypropylene light-transmitting material in an automobile bumper material.

[0021] The polypropylene light-transmitting material provided by the application has excellent high-haze performance, can effectively weaken the phenomenon of seeing light source points from the appearance, and improves the quality when used in a light-transmitting bumper with LED light sources on the back of the part.

[0022] In summary, the technical scheme of the application has the following effects:

[0023] The application selects the homopolypropylene MN90B, the homopolypropylene V30G, and rubber G1657 as the main material, adds the magnesium sulfate whisker, and mixes the polyolefin and the Lotader AX8700 toughening agent to form the regulator, selects the sorbitol nucleating agent and the organic silicon nucleating agent to form the light transmittance improver, and combines the antioxidant, the zinc stearate lubricant, the ultraviolet absorber, and the light stabilizer according to specific amounts, so that the prepared polypropylene material has excellent light transmittance, haze, and mechanical properties. DETAILED DESCRIPTION

[0024] The application is further described in detail below in combination with examples, comparative examples, and performance detection tests, and the examples cannot be understood as limiting the scope of the application.

[0025] Examples

[0026] Examples 1-5

[0027] Examples 1-5 respectively provide a polypropylene light-transmitting material and a preparation method thereof.

[0028] The difference between the above examples lies in that the amounts of the raw material components in the polypropylene light-transmitting material are different, and the specific amounts are shown in Table 1.

[0029] The preparation method of the polypropylene light-transmitting material in the above examples is specifically shown as follows.

[0030] According to Table 1, the corresponding weights of the raw material components are respectively taken.

[0031] SK8730L polyolefin, Lotader AX8700 toughening agent were mixed in a high-speed mixer in a weight ratio of 13:2 for 3 min to obtain the regulator;

[0032] Homopolypropylene MN90B with a melt index of 100 g / 10 min, homopolypropylene V30G with a melt index of 20 g / 10 min, rubber G1657 (SEBS elastomer), the regulator, antioxidant (consisting of antioxidant 1010 and antioxidant 168 mixed in a weight ratio of 1:1), zinc stearate lubricant, ultraviolet absorber SUNV5540, light stabilizer UV70DF, light transmittance improver (consisting of NX8000K dibenzyl sorbitol nucleating agent and R972 silicone nucleating agent mixed in a weight ratio of 1.5:4), were mixed in a high-speed mixer for 8 min and fed into a screw extruder from a main feeding device;

[0033] Magnesium sulfate whiskers NP-YW2 (diameter of 1.5 μm, aspect ratio of 30-36:1, purity of 99%, bulk density of 0.22 g / cm 3 , microstructure in needle shape) were fed into the screw extruder from a side feeding device;

[0034] The mixture was melt-extruded through the screw extruder, and dried to obtain the polypropylene light-transmitting material;

[0035] The temperature of the twin-screw extruder was set as follows: 180°C in the first zone, 190°C in the second zone, 220°C in the third zone, the die temperature was 220°C, and the screw rotation speed was 400 r / min; the feeding speed was 35 kg / h.

[0036] Table 1 Amounts of each raw material component in the polypropylene light-transmitting material in Examples 1-5 and Comparative Examples 1-2

[0037]

[0038] Examples 6-10

[0039] Examples 6-10 respectively provide a polypropylene light-transmitting material and a preparation method thereof.

[0040] The above examples differ from Example 3 in that the types of the regulator are different, as shown below.

[0041] In Example 6: the regulator consists of POE 8880 polyolefin and Lotader AX8700 toughening agent mixed in a weight ratio of 13:2.

[0042] In Example 7: the conditioning agent consists of a mixture of LC675 polyolefin, Lotader AX8700 toughener in a weight ratio of 13:2.

[0043] In Example 8: the conditioning agent consists of a mixture of SK8730L polyolefin, Lotader AX8700 toughener in a weight ratio of 10:3.

[0044] In Example 9: the conditioning agent consists of a mixture of SK8730L polyolefin, Lotader AX8700 toughener in a weight ratio of 11 :2.5.

[0045] In Example 10: the conditioning agent consists of a mixture of SK8730L polyolefin, Lotader AX8700 toughener in a weight ratio of 14:1.5.

[0046] In the above examples, other process parameters are the same as in Example 3.

[0047] Examples 11-16

[0048] Examples 11-16 each provide a polypropylene light-transmitting material and a method of making the same.

[0049] The above examples differ from Example 3 in that the type of light-transmission modifier is different, as shown below.

[0050] In Example 11: the light-transmission modifier consists of a mixture of NX8000K dibenzyl sorbitol nucleating agent, Dow MB50-001 silicone nucleating agent in a weight ratio of 1.5:4.

[0051] In Example 12: the light-transmission modifier consists of a mixture of NX8000K dibenzyl sorbitol nucleating agent, 3988 silicone nucleating agent in a weight ratio of 1.5:4.

[0052] In Example 13: the light-transmission modifier consists of a mixture of NX8000K dibenzyl sorbitol nucleating agent, R972 silicone nucleating agent in a weight ratio of 4:1.5.

[0053] In Example 14: the light-transmission modifier consists of a mixture of NX8000K dibenzyl sorbitol nucleating agent, R972 silicone nucleating agent in a weight ratio of 1:1.

[0054] In Example 15: the light-transmission modifier consists of a mixture of NX8000K dibenzyl sorbitol nucleating agent, R972 silicone nucleating agent in a weight ratio of 1:5.

[0055] In Example 16: the light transmittance modifier is composed of NX8000K dibenzyl sorbitol nucleating agent and Irgafos168 antioxidant in a weight ratio of 2:3, R972 silicone nucleating agent is mixed.

[0056] The other process parameters in the above examples are the same as those in Example 3.

[0057] Comparative Example

[0058] Comparative Example 1-2

[0059] Comparative Example 1-2 respectively provides a polypropylene light-transmitting material and a preparation method thereof.

[0060] The difference between the above comparative example and Example 3 is that the amount of each raw material component in the polypropylene light-transmitting material is different, as shown in Table 1.

[0061] The other process parameters in the above comparative example are the same as those in Example 1.

[0062] Comparative Example 3-7

[0063] Comparative Example 3-7 respectively provides a polypropylene light-transmitting material and a preparation method thereof.

[0064] The difference between the above comparative example and Example 3 is as follows.

[0065] In Comparative Example 3: equal amount of copolymerized polypropylene BEW03A with a melt index of 100 g / 10 min is used to replace homopolymerized polypropylene MN90B.

[0066] In Comparative Example 4: the amount of homopolymerized polypropylene MN90B with a melt index of 100 g / 10 min is 20 parts, and the amount of homopolymerized polypropylene V30G with a melt index of 20 g / 10 min is 30 parts.

[0067] In Comparative Example 5: equal amount of rubber LC670 is used to replace rubber G1657.

[0068] In Comparative Example 6: the modifier is composed of SK8730L polyolefin and Elvaloy4924 toughening agent in a weight ratio of 13:2.

[0069] In Comparative Example 7: the modifier is composed of SK8730L polyolefin and Lotader AX8700 toughening agent in a weight ratio of 2:13.

[0070] The other process parameters in the above comparative example are the same as those in Example 1.

[0071] Performance detection test

[0072] Tensile strength (yield strength), elongation at break: tested according to the method specified in ISO 527, 50 mm / min, test specimens: ISO A type polypropylene transparent material specimens molded by injection.

[0073] Tensile modulus: tested according to the method specified in ISO 527, 2 mm / min, test specimens: ISO A type polypropylene transparent material specimens molded by injection.

[0074] Flexural strength, flexural modulus: tested according to the method specified in ISO 178, test specimens: ISO A type polypropylene transparent material specimens molded by injection.

[0075] Charpy notched impact (two temperatures: 23℃, -30℃): tested according to the method specified in ISO 179, test specimens: polypropylene transparent material specimens of size 80 mm x 10 mm x 4 mm molded by injection and milled A type notched.

[0076] Transmittance: tested according to the method specified in GB / T 2410-2008, test specimens: polypropylene transparent material disc specimens of size 50 mm in diameter and 2 mm in thickness molded by injection.

[0077] Haze: tested according to the method specified in GB / T 2410-2008, test specimens: polypropylene transparent material disc specimens of size 50 mm in diameter and 2 mm in thickness molded by injection.

[0078] Test results: as shown in Table 2.

[0079] Table 2: Performance test results of polypropylene transparent material in examples and comparative examples

[0080]

[0081]

[0082] From the test results in the above table, it can be seen that the polypropylene transparent material prepared by using the technical solution provided in the present application has excellent mechanical properties and optical properties.

[0083] By comparing the test results of Comparative Examples 1-5 and Comparative Examples 1-2, it can be seen that the amount of each raw material component has a great influence on the performance of the polypropylene transparent material product. By screening and optimizing the amount of each raw material component, the polypropylene transparent material prepared in the present application has excellent mechanical properties and optical properties.

[0084] 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; in Comparative Example 4, the amount of homopolymerized polypropylene MN90B having a melt index of 100 g / 10 min was 20 parts, and the amount of homopolymerized polypropylene V30G having a melt index of 20 g / 10 min was 30 parts; in Comparative Example 5, an equal amount of rubber LC670 was used instead of rubber G1657, and the polypropylene light-transmitting material prepared had poor performance; in contrast, in the present application, 28-32 parts of homopolymerized polypropylene MN90B having a melt index of 80-120 g / 10 min, 18-22 parts of homopolymerized polypropylene V30G having a melt index of 15-25 g / 10 min, and 25-29 parts of rubber G1657 were used as the main material, and the polypropylene light-transmitting material prepared had excellent performance.

[0085] Based on the test results of Comparative Examples 3, 6-10, and Comparative Examples 6-9, the present application selected a light-transmittance modifier composed of a mixture of polyolefin and Lotader AX8700 toughening agent in a weight ratio of 10-15:1-3, and the polypropylene light-transmitting material prepared had excellent performance.

[0086] Based on the test results of Comparative Examples 3, 11-13, the present application selected a light-transmittance modifier composed of a mixture of sorbitol nucleating agent and silicone nucleating agent in a weight ratio of 1-5:1-5, and the performance of the polypropylene light-transmitting material was further improved.

[0087] Although the present application has been described in detail with general description and specific embodiments above, some modifications or improvements can be made on the basis of the present application, which is obvious to those skilled in the art. Therefore, these modifications or improvements made on the basis of not deviating from the spirit of the present application are within the scope of the present application.

Claims

1. A polypropylene light-transmitting material, characterized by, Specifically comprising the following components by weight: 28-32 parts of homopolypropylene MN90B with a melt index of 100 g / 10 min, 18-22 parts of homopolypropylene V30G with a melt index of 20 g / 10 min, 25-29 parts of rubber G1657, 20-24 parts of magnesium sulfate whiskers, 1-3 parts of a modifier, 0.1-0.3 parts of an antioxidant, 0.2-0.4 parts of a lubricant, 0.08-0.12 parts of a UV absorber, 0.1-0.3 parts of a light stabilizer, 0.5-0.7 parts of a light transmittance improver; The modifier is composed of polyolefin and Lotader AX8700 toughening agent in a weight ratio of 10-15:1-3; the polyolefin is selected from one or more of Versify™ POE 8200, POE 8880, LC675, and SK8730L; The light transmittance improver is composed of sorbitol nucleating agent and silicone nucleating agent in a weight ratio of 1-5:1-5; the silicone nucleating agent is selected from one or more of Dow Corning® MB50-001, Aerosil® R972, and Tospearl® 120.

2. The polypropylene light-transmitting material according to claim 1, characterized in that, Specifically comprising the following components by weight: 29-31 parts of homopolypropylene MN90B with a melt index of 100 g / 10 min, 19-21 parts of homopolypropylene V30G with a melt index of 20 g / 10 min, 26-28 parts of rubber G1657, 21-23 parts of magnesium sulfate whiskers, 1.5-2.5 parts of a modifier, 0.15-0.25 parts of an antioxidant, 0.25-0.35 parts of a lubricant, 0.09-0.11 parts of a UV absorber, 0.15-0.25 parts of a light stabilizer, 0.55-0.65 parts of a light transmittance improver.

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

5. The polypropylene light-transmitting material according to claim 1, wherein The sorbitol nucleating agent is NX8000K dibenzylidene sorbitol nucleating agent.

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

7. The polypropylene light-transmitting material according to claim 1, wherein The antioxidant is composed of antioxidant 1010 and antioxidant 168 in a weight ratio of 0.5-1.5:0.5-1.

5.

8. The method for preparing the polypropylene light-transmitting material according to any one of claims 1-7, characterized in that, Specifically comprising the following steps in sequence: The homopolypropylene MN90B, the homopolypropylene V30G, the rubber G1657, the modifier, the antioxidant, the lubricant, the UV absorber, the light stabilizer, and the light transmittance improver are added to the screw extruder from the main feeding port; the magnesium sulfate whiskers are fed to the screw extruder from the side feeding device; and the polypropylene light-transmitting material is obtained through melt extrusion and drying; The temperature of the screw extruder is set as follows: 170-190°C for zone 1, 180-195°C for zone 2, 200-230°C for zone 3, 215-230°C for the die head, and the screw rotation speed is 350-450 r / min; the feeding speed is 30-45 kg / h.

9. Use of the polypropylene light-transmitting material according to any one of claims 1-7 in automobile bumper materials.

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