Polypropylene composition, process for its preparation and use thereof

Abstract

The application discloses a kind of polypropylene composition and its preparation method and application, belong to high polymer material technical field;The polypropylene composition provided by the application includes the following components by mass fraction: 46-68 parts of PP resin, 5-16 parts of toughening agent, 8-22 parts of filler, 0.6-4.2 parts of silicone, 8-17 parts of HDPE resin, 0.1-0.6 parts of phthalocyanine blue, 0-1.2 parts of auxiliary agent;The phthalocyanine blue is beta crystal form;The melt index of the PP resin under 230 DEG C / 2.16kg is greater than or equal to 8g / 10min.The polypropylene composition provided by the application can realize good high blue phase on the basis of also having excellent weather resistance and scratch resistance by selecting appropriate mass fraction of components, and components cooperate with each other.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of high polymer materials, and particularly relates to a polypropylene composition and a preparation method and application thereof. BACKGROUND

[0002] As a high cost-effective general-purpose plastic, polypropylene has excellent mechanical properties of high strength and high toughness, and characteristics of chemical resistance, high heat resistance, etc. after modification, and is widely used in household appliances and automotive products. The original polypropylene interior material for vehicles has fewer colors, mainly considering the safety of passengers (visual fatigue), and the colors are mainly light and black. With the development of new energy and intelligentization of automobiles, new energy automobile manufacturers pursue fashion and advanced design in interior design, and therefore colorful polypropylene materials are more widely used.

[0003] For colorful polypropylene materials, in order to achieve high color saturation, organic pigments are usually used as colorants. Compared with the original polypropylene material using carbon black as a colorant, on the one hand, the stability of organic pigments is generally lower than that of carbon black, which is prone to discoloration under light, and carbon black can be used as an efficient ultraviolet light absorber. The use of organic pigments instead of carbon black makes the material more susceptible to ultraviolet light and more prone to photoaging. On the other hand, the use of organic pigments instead of carbon black significantly reduces the light shielding property of the entire material, significantly increases the lightness value of the material color, and significantly reduces the scratch resistance of the material. Especially for blue automotive interior polypropylene, there are generally problems of weather resistance and scratch resistance. SUMMARY

[0004] The present application aims to overcome the shortcomings of the prior art and provide a polypropylene composition with high blue phase, good weather resistance and scratch resistance, and a preparation method and application thereof.

[0005] To achieve the above-mentioned purpose, in the first aspect of the present application, the present application provides a polypropylene composition, which comprises the following components by mass fraction:

[0006] 46-68 parts of PP resin, 5-16 parts of toughening agent, 8-22 parts of filler, 0.6-4.2 parts of silicone, 8-17 parts of HDPE resin, 0.1-0.6 parts of phthalocyanine blue, and 0-1.2 parts of auxiliary agent;

[0007] The phthalocyanine blue is in a beta crystal form.

[0008] The PP resin has a melt index of ≥8 g / 10 min at 230℃ / 2.16 kg.

[0009] The polypropylene composition provided by the application can realize good high blue phase and has excellent weather resistance and scratch resistance by selecting appropriate mass fractions of components and the cooperation between the components.

[0010] Specifically, the resin system provided by the application can facilitate the dispersion of the beta crystal phthalocyanine blue, so that the polypropylene composition better exhibits blue phase; the addition of silicone and HDPE resin can alleviate the problem of decreased scratch resistance caused by the addition of beta crystal phthalocyanine blue; at the same time, the addition of silicone can also alleviate the problem of decreased weather resistance caused by the addition of beta crystal phthalocyanine blue; in addition, the addition of the toughening agent can further improve the weather resistance and scratch resistance of the polypropylene composition in cooperation with the filler and silicone and HDPE resin.

[0011] Exemplarily, the PP resin can be any point value or any two-point range value between 46-68 parts, such as 48-66 parts, or 48 parts, 50 parts, 52 parts, 55 parts, 58 parts, 60 parts, 62 parts, 65 parts, 66 parts, etc.; the toughening agent can be any point value or any two-point range value between 5-16 parts, such as 6-15 parts, or 5 parts, 6 parts, 7 parts, 8 parts, 10 parts, 12 parts, 14 parts, 15 parts, 16 parts, etc.; the filler can be any point value or any two-point range value between 8-22 parts, such as 10-20 parts, or 8 parts, 10 parts, 12 parts, 14 parts, 16 parts, 18 parts, 20 parts, 22 parts, etc.; the silicone can be any point value or any two-point range value between 0.6-4.2 parts, such as 1.2-2.4 parts, or 0.6 parts, 1 part, 2 parts, 3 parts, 4 parts, 4.2 parts, etc.; the HDPE resin can be any point value or any two-point range value between 8-17 parts, such as 10-15 parts, or 8 parts, 10 parts, 12 parts, 14 parts, 16 parts, 17 parts, etc.; the phthalocyanine blue can be any point value or any two-point range value between 0.1-0.6 parts, such as 0.2-0.5 parts, or 0.2 parts, 0.3 parts, 0.4 parts, 0.5 parts, 0.6 parts, etc.; the auxiliary agent can be any point value or any two-point range value between 0-1.2 parts, such as 0.1-1 part, or 0 parts, 0.2 parts, 0.4 parts, 0.6 parts, 0.8 parts, 1 part, 1.2 parts, etc.

[0012] Preferably, the mass percentage of the PP resin in the polypropylene composition is ≥41%.

[0013] More preferably, the mass percentage of the PP resin in the polypropylene composition is 47-67%.

[0014] As a preferred embodiment of the polypropylene composition of the present application, the polypropylene composition comprises the following components by mass fraction: 55-63 parts of PP resin, 8-12 parts of toughening agent, 13-17 parts of filler, 1.2-2.4 parts of silicone, 10-14 parts of HDPE resin, 0.3-0.4 parts of phthalocyanine blue, and 0.2-0.5 parts of auxiliary agent.

[0015] The present application research found that the mass fraction of the components in the polypropylene composition can affect the comprehensive performance of the components, and when the mass fraction of the components is further selected within the above range, the comprehensive performance of the obtained polypropylene composition is more excellent.

[0016] It should be noted that the melt index of the PP resin at 230℃ / 2.16kg is tested according to ISO 1133-1 2022.

[0017] Exemplarily, the melt index of the PP resin at 230℃ / 2.16kg can be any point value or any two-point range value between ≥8g / 10min, such as 8-60g / 10min, 10-60g / 10min, 10-30g / 10min, 15-60g / 10min, 30-60g / 10min, etc., or can be 8g / 10min, 10g / 10min, 12g / 10min, 15g / 10min, 18g / 10min, 20g / 10min, 22g / 10min, 25g / 10min, 28g / 10min, 30g / 10min, 32g / 10min, 35g / 10min, 38g / 10min, 40g / 10min, 42g / 10min, 45g / 10min, 48g / 10min, 50g / 10min, 52g / 10min, 55g / 10min, 58g / 10min, 60g / 10min, etc.

[0018] As a preferred embodiment of the polypropylene composition of the present application, the melt index of the PP resin at 230℃ / 2.16kg is 15-30g / 10min. For example, it can be 15g / 10min, 17g / 10min, 19g / 10min, 20g / 10min, 22g / 10min, 24g / 10min, 26g / 10min, 28g / 10min, 30g / 10min, etc.

[0019] The present application research found that by selecting a PP resin with a melt index of ≥8g / 10min, and further selecting a PP resin with a melt index of 15-30g / 10min, a relatively suitable fluidity can be provided, and good compatibility with other components can be achieved, which can effectively enable the polypropylene composition to exhibit high blue phase, and the obtained polypropylene composition has more excellent weather resistance and scratch resistance.

[0020] As a preferred embodiment of the polypropylene composition of the present application, the melt viscosity of the toughening agent at 190℃, 1000S -1 The melt viscosity at shear rate is 400-600Pa·s.

[0021] It should be noted that the melt viscosity of the toughening agent at 190℃, 1000S -1 The melt viscosity at shear rate is tested according to ASTM D3835-16 2016.

[0022] Exemplarily, the melt viscosity of the toughening agent at 190℃, 1000S -1 The melt viscosity at shear rate can be any point value or any two-point range value between 400-600Pa·s, such as 406-598Pa·s, 406-449Pa·s, 406-461Pa·s, 406-598Pa·s, 461-598Pa·s, etc., or can be 400Pa·s, 406Pa·s, 420Pa·s, 450Pa·s, 480Pa·s, 500Pa·s, 520Pa·s, 550Pa·s, 580Pa·s, 600Pa·s, etc.

[0023] Preferably, the melt viscosity of the toughening agent at 190℃, 1000S -1 The melt viscosity at shear rate is 440-480Pa·s.

[0024] The present application found that the melt viscosity of the toughening agent not only affects the compatibility of the toughening agent and the PP resin, but also affects the interaction between the toughening agent and the filler, silicone, phthalocyanine blue and HDPE. When the melt viscosity of the toughening agent is further selected to be 400-600Pa·s, especially 440-480Pa·s, the scratch resistance and weather resistance of the obtained polypropylene composition are more excellent, and the blue phase can be exhibited better.

[0025] It should be noted that the present application does not have special requirements for the melt index of the HDPE resin. Exemplarily, the melt index of the HDPE resin at 190℃ / 2.16kg can be 3-15g / 10min according to IS0 1133-1 2022.

[0026] As a preferred embodiment of the polypropylene composition of the present application, the toughening agent comprises at least one of SEBS and POE.

[0027] Preferably, the toughening agent comprises SEBS.

[0028] As a preferred embodiment of the polypropylene composition of the present application, the filler comprises at least one of talc, calcium carbonate, barium sulfate and mica.

[0029] Preferably, the filler comprises mica.

[0030] The present application has found that the addition of the filler not only helps the dispersion of the β crystal phthalocyanine blue, so that the polypropylene composition better shows the blue phase, but also helps to improve the scratch resistance and weather resistance of the polypropylene composition, and when the filler is further selected to be the above-mentioned type of substance, especially mica, the lamellar structure thereof can make the comprehensive performance of the obtained polypropylene composition more excellent.

[0031] It should be noted that the present application does not have special requirements for the average particle size of the filler. Illustratively, the particle size of the filler can be 3-25 μm.

[0032] As a preferred embodiment of the polypropylene composition of the present application, the auxiliary agent comprises at least one of an antioxidant and a light stabilizer.

[0033] Preferably, the antioxidant comprises at least one of antioxidant 1010, antioxidant 168, antioxidant 1076, antioxidant 1790, and antioxidant 770.

[0034] Preferably, the light stabilizer comprises at least one of UV-3808, light stabilizer LA-402AF, and light stabilizer T-81.

[0035] In a second aspect of the present application, the present application provides a preparation method of the polypropylene composition, which comprises the following steps: uniformly mixing the components and then melt mixing, and then extruding and granulating to obtain the polypropylene composition.

[0036] As a preferred embodiment of the preparation method of the present application, the temperature of the melt mixing is 100-210 ℃, and the rotation speed of the screw during the melt mixing is 350-450 r / min.

[0037] It should be noted that the silicone in the present application can be added in the form of silicone master granules. The present application does not have special requirements for the silicone master granules, and illustratively, the silicone master granules comprise the following components by mass fraction: 55-65 parts of silicone, and 35-45 parts of polypropylene.

[0038] In a third aspect of the present application, the present application provides the use of the polypropylene composition in the preparation of automobile interiors.

[0039] Illustratively, the automobile interiors comprise automobile instrument panels, automobile seats, automobile roofs, automobile fenders, automobile door inner panels, etc.

[0040] Compared with the prior art, the polypropylene composition provided by the application has good high blue phase, excellent weather resistance and scratch resistance by selecting appropriate mass fractions of components and mutual cooperation between the components. DETAILED DESCRIPTION

[0041] For better illustrating the purpose, technical scheme and advantages of the application, the application will be further described in combination with specific examples.

[0042] The reagents, methods and equipment used in the application are all conventional reagents, methods and equipment in the field unless otherwise specified, and the raw materials used in parallel experiments are the same batch of raw materials unless otherwise specified.

[0043] PP resin 1: melt index at 230℃ / 2.16kg is 30g / 10min, EP548R, CNOOC Shell Petrochemicals Co., Ltd.;

[0044] PP resin 2: melt index at 230℃ / 2.16kg is 15g / 10min, K9017, Taiwan Chemical Fibre Co., Ltd., Taiwan Province, China;

[0045] PP resin 3: melt index at 230℃ / 2.16kg is 60g / 10min, BX3900, SK Chemicals;

[0046] PP resin 4: melt index at 230℃ / 2.16kg is 10g / 10min, K9010, Taiwan Chemical Fibre Co., Ltd., Taiwan Province, China;

[0047] PP resin 5: melt index at 230℃ / 2.16kg is 4g / 10min, PP7032E3, Exxon Mobil Corporation;

[0048] Toughening agent 1: SEBS, melt viscosity at 1000S -1 shear rate is 461Pa·s, SEBS S6552, Zhejiang Zhongli Synthetic New Material Co., Ltd.;

[0049] Toughening agent 2: SEBS, melt viscosity at 1000S -1 shear rate is 598Pa·s, SEBS 9552U, Li Changrong Chemical Industry Co., Ltd.;

[0050] Toughening agent 3: SEBS, melt viscosity at 1000S -1 shear rate is 406Pa·s, SEBS G1657, Kortec Polymer Co., Ltd.;

[0051] Toughening agent 4: POE, melt viscosity at 1000S-1 Melt viscosity at shear rate 449 Pa-s, POE ENGAGE 7467, Dow Chemical;

[0052] Filler 1: Mica, 300HC, Huajing Mica Co., Ltd.;

[0053] Filler 2: Talc, TYT-777A, Beihai Group;

[0054] Filler 3: Calcium carbonate, AC-05N, Guangdong Xianglong Technology Co., Ltd.;

[0055] Silicone: Silicone masterbatch, the mass percentage of silicone in the silicone masterbatch is 60%, and the balance is polypropylene, commercially available;

[0056] Eruic acid amide: commercially available;

[0057] HDPE: HDPE DMDA8008, PetroChina Co., Ltd.;

[0058] Phthalocyanine blue 1: β crystal form, commercially available;

[0059] Phthalocyanine blue 2: α crystal form, commercially available;

[0060] Antioxidant: a mixture of antioxidant 1010 and antioxidant 168 in a ratio of 1:1, antioxidant 1010 and antioxidant 168 are commercially available;

[0061] Light stabilizer: UV-3808, commercially available.

[0062] Examples 1-11 and Comparative Examples 1-7

[0063] The examples and comparative examples of the present application provide a polypropylene composition, the component content (weight parts) of the polypropylene composition is shown in Tables 1-2;

[0064] Table 1

[0065]

[0066] Table 2

[0067]

[0068] The preparation method of the polypropylene composition provided in Example 1 is as follows:

[0069] After the components are mixed evenly, they are added into a twin-screw extruder for melt mixing. There are totally 8 sections, and the temperatures of the first section to the eighth section are 100℃, 200℃, 200℃, 200℃, 200℃, 210℃, 200℃, and 200℃ respectively. The screw rotation speed is 400r / min. After melt mixing, the polypropylene composition is obtained by extrusion granulation.

[0070] The preparation method of the polypropylene composition provided in Examples 2-11 and Comparative Examples 1-7 is consistent with that of Example 1, and the relevant components are not added.

[0071] Effect example

[0072] The performance of the polypropylene composition prepared in the effect example, the verification example and the comparative example is verified, including the following aspects:

[0073] 1. Blue phase test: The test is performed according to GB / T 7921-2008, D65 light source, SCI mode, test Lab value, and record b value;

[0074] 2. Weather resistance test: The test is performed according to the method B in ISO 4892-2:2013, and then the color difference ΔE value is calculated and recorded. Specifically, during the test, the irradiation is 1.1W / (m 2 ·nm)@420nm, the black standard temperature is 100℃, the relative humidity is 20%, and the continuous light irradiation time is 650h. The ΔE is calculated and recorded. ; wherein L1 represents the lightness value before the test, a1 represents the red-green attribute before the test, and b1 represents the yellow-blue attribute before the test; L2 represents the lightness value after the test, a2 represents the red-green attribute after the test, and b2 represents the yellow-blue attribute after the test;

[0075] 3. Scratch resistance test: The test is performed according to the Volkswagen PV3952 standard, and the test conditions are as follows: 10N, measure the L value before and after scratching, calculate and record ΔL, wherein ΔL=the L value after scratching-the L value before scratching;

[0076] The results obtained by the above tests are shown in Table 3.

[0077] Table 3

[0078]

[0079] As can be seen from Table 3, when the technical solution of the present application is adopted, the obtained polypropylene can exhibit excellent blue phase, and also has good weather resistance and scratch resistance. Specifically, the b value of the obtained polypropylene composition is below-18.5, the ΔE is below 2.08, and the ΔL is below 1.29.

[0080] From the examples 1-3 and the comparative examples 4-7, it can be seen that the mass parts of the components in the polypropylene composition will affect the comprehensive effect of the product, when the addition amount of silicone in the comparative example 4 is too much, the weather resistance of the obtained composition is obviously deteriorated; when the addition amount of HDPE in the comparative example 5 is too little, the scratch resistance of the obtained composition presents an obvious downward trend; when the addition amount of phthalocyanine blue in the comparative example 6 is too little, not only the b value increases, i.e. the blue phase decreases, but also the scratch resistance of the obtained composition presents an obvious downward trend; when the addition amount of phthalocyanine blue in the comparative example 7 is too much, although the blue phase of the obtained product is better, the weather resistance is significantly deteriorated;

[0081] From the examples 1, examples 4-6 and the comparative example 3, it can be seen that the melt index of the PP resin will also affect the performance of the product, when the melt index of the PP resin in the comparative example 3 is not within the range given in the application, the blue phase of the obtained composition is weak, and the scratch resistance is also significantly deteriorated;

[0082] From the examples 1 and the comparative example 2, it can be seen that the crystal form of phthalocyanine blue will also affect the comprehensive performance of the composition, when the crystal form of phthalocyanine blue in the comparative example 2 is not in the application, the weather resistance of the obtained composition is significantly deteriorated; from the examples 1 and the comparative example 1, it can be seen that when the comparative example 1 uses erucamide to replace silicone, the weather resistance of the obtained composition is significantly deteriorated.

[0083] Finally, it should be noted that the above examples are to illustrate the technical solutions of the application and not to limit the protection scope of the application, although the application has been described in detail with reference to the preferred examples, those skilled in the art should understand that the technical solutions of the application can be modified or replaced equivalently without departing from the essence and scope of the technical solutions of the application.

Claims

1. A polypropylene composition, characterized in that, The polypropylene composition comprises the following components by mass fraction: 46-68 parts of PP resin, 5-16 parts of toughening agent, 8-22 parts of filler, 0.6-4.2 parts of silicone, 8-17 parts of HDPE resin, 0.1-0.6 parts of phthalocyanine blue, 0-1.2 parts of auxiliary agent; The phthalocyanine blue is in a β crystal form; The PP resin has a melt index of ≥8 g / 10 min at 230℃ / 2.16 kg.

2. The polypropylene composition according to claim 1, characterized in that The polypropylene composition comprises the following components by mass fraction: 55-63 parts of PP resin, 8-12 parts of toughening agent, 13-17 parts of filler, 1.2-2.4 parts of silicone, 10-14 parts of HDPE resin, 0.3-0.4 parts of β phthalocyanine blue, 0.2-0.5 parts of auxiliary agent.

3. The polypropylene composition according to claim 1, characterized in that The PP resin has a melt index of 15-30 g / 10 min at 230℃ / 2.16 kg.

4. The polypropylene composition according to claim 1, characterized in that The flexibilizer has a melt viscosity of 400-600 Pa-s at 190°C, 1000 s -1 400-600 Pa-s at 190°C, 1000 s 5. The polypropylene composition according to claim 1, characterized in that The toughening agent comprises at least one of SEBS and POE.

6. The polypropylene composition according to claim 1, characterized in that The filler comprises at least one of talc, calcium carbonate, barium sulfate, and mica.

7. The polypropylene composition according to claim 1, characterized in that The auxiliary agent comprises at least one of an antioxidant and a light stabilizer.

8. Process for the preparation of a polypropylene composition according to any one of claims 1 to 7, characterized in that, The preparation method comprises the following steps: After the components are uniformly mixed, melt mixing is performed, followed by extrusion granulation to obtain the polypropylene composition.

9. Use of the polypropylene composition according to any one of claims 1-7 in the preparation of automotive interior trim.

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