Creep-resistant glass fiber reinforced polypropylene material, preparation method thereof and liquid accumulator

Abstract

The invention provides a creep-resistant glass fiber reinforced polypropylene material, a preparation method thereof and a liquid accumulator, and belongs to the technical field of polypropylene materials. The high-isotacticity homo-polypropylene adopted by the invention has high crystallinity, an amorphous region with a lower proportion corresponds to the high crystallinity, the amorphous region with the lower proportion can reduce the occurrence of creep deformation in a product stress process, and a propylene part in the propylene-butylene copolymer can participate in crystallization together with the high-isotacticity homo-polypropylene, so that the product has high crystallinity. Butene with a longer side branch chain compared with olefin plays an anchoring role in a polypropylene crystal phase, and the creep resistance effect of the polypropylene material is further improved through the synergistic effect of high-isotacticity homo-polypropylene and the propylene-butene copolymer.

Description

Technical Field

[0001] The invention relates to the technical field of polypropylene materials, and in particular to a creep-resistant glass fiber reinforced polypropylene material and a preparation method thereof, and a liquid storage device. Background Art

[0002] Polypropylene (PP for short) is a semi-crystalline thermoplastic with high impact resistance, strong mechanical properties, resistance to a variety of organic solvents and acid-base corrosion, and is widely used in the industry. Glass fiber reinforced polypropylene (PP-GF for short) is one of the new varieties that has attracted much attention. This material can not only effectively improve the rigidity, impact strength and dimensional stability of the product, but also can be used to make complex automotive module products. However, the creep resistance of polypropylene materials and glass fiber reinforced polypropylene materials is poor, especially polypropylene materials are easily deformed due to stress relaxation at high temperatures, which greatly limits the production and use of products. Therefore, how to improve the high temperature creep resistance of polypropylene materials has become a technical problem that needs to be solved urgently in this field. Summary of the invention

[0003] The object of the present invention is to provide a creep-resistant glass fiber reinforced polypropylene material, a preparation method thereof and a liquid storage device. The creep-resistant glass fiber reinforced polypropylene material provided by the present invention has a high melt index, good processing performance, and excellent mechanical properties and creep resistance.

[0004] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0005] The invention provides a creep-resistant glass fiber reinforced polypropylene material, which comprises 30-80 parts of high-isotactic homopolymer polypropylene, 10-40 parts of propylene-butene copolymer, 10-40 parts of glass fiber, 1-4 parts of maleic anhydride grafted PP and 0.2-0.6 parts of antioxidant in parts by weight.

[0006] Preferably, the high isotactic homopolypropylene is SK HX3300H; the indicators of the high isotactic homopolypropylene are: MFR=5, isotacticity 99 parts, and tensile strength 38 MPa.

[0007] Preferably, the indicators of the propylene-butene copolymer are: MFR=2.6, butene content 3%.

[0008] Preferably, the length of the glass fiber is 2-5 mm, and the diameter of the glass fiber is 8-12 μm.

[0009] Preferably, the maleic anhydride grafted PP is GPM200B.

[0010] Preferably, the antioxidant includes antioxidant 1010 and antioxidant 168.

[0011] Preferably, the mass ratio of the antioxidant 1010 to the antioxidant 168 is 1:(0.5-1.5).

[0012] The present invention provides a method for preparing the creep-resistant glass fiber reinforced polypropylene material described in the above technical solution, comprising: melt-extruding high-isotactic homopolymer polypropylene, glass fiber, maleic anhydride grafted PP, propylene-butene copolymer and antioxidant to obtain the creep-resistant glass fiber reinforced polypropylene material.

[0013] Preferably, the processing temperature during melt extrusion is: first zone: 55-65°C, second zone: 90-110°C, third zone: 140-160°C, fourth zone: 190-200°C, fifth zone: 190-200°C, sixth zone: 190-200°C, seventh zone: 180-190°C, eighth zone: 180-190°C, ninth zone: 180-190°C, tenth zone: 190-200°C, die head 190-200°C.

[0014] The present invention provides a liquid reservoir, which is used for storing coolant in a thermal management system. The liquid reservoir is characterized in that the liquid reservoir comprises a shell, the shell is made of creep-resistant glass fiber reinforced polypropylene material, and the creep-resistant glass fiber reinforced polypropylene material comprises, by weight, 30 to 80 parts of high-isotactic homopolypropylene, 10 to 40 parts of propylene-butene copolymer, 10 to 40 parts of glass fiber, 1 to 4 parts of maleic anhydride grafted PP and 0.2 to 0.6 parts of antioxidant.

[0015] The present invention provides a creep-resistant glass fiber reinforced polypropylene material, which comprises 30 to 80 parts of high isotactic homopolymerized polypropylene, 10 to 40 parts of propylene-butene copolymer, 10 to 40 parts of glass fiber, 1 to 4 parts of maleic anhydride grafted PP and 0.2 to 0.6 parts of antioxidant by weight. The present invention can improve the crystallinity of polypropylene by using high isotactic homopolymerized polypropylene, so that the tensile strength of the polypropylene material is higher; the tensile strength and bending strength of polypropylene can be greatly improved by adding glass fiber reinforcement; maleic anhydride grafted PP can greatly improve the dispersibility and compatibility of each component of the composite material; butene in propylene-butene copolymer can provide longer side chains, increase the entanglement between molecules, and enhance creep resistance. In a thermal management system, the operating temperature of the coolant is generally -40 to 120°C. The liquid reservoir prepared by using the creep-resistant glass fiber reinforced polypropylene material provided by the present invention has better dimensional stability and longer service life. The high isotactic homopolypropylene used in the present invention has high crystallinity, and the amorphous region with a lower proportion corresponding to the high crystallinity can reduce the occurrence of creep in the process of product stress, and the propylene part in the propylene-butene copolymer can participate in crystallization together with the high isotactic homopolypropylene, and the butene with a longer side branch chain than the olefin plays an anchoring role in the polypropylene crystal phase, and the synergistic effect of the high isotactic homopolypropylene and the propylene-butene copolymer is further improved to further improve the creep resistance of the polypropylene material. The results of the embodiment show that the melt index MFR of the creep-resistant glass fiber reinforced polypropylene material provided by the present invention is 2.0-2.5 (2.16kg, 230℃), the tensile strength is greater than 105MPa, the tensile creep (120℃, 10MPa, 30h) is 0.45-0.50%, and the tensile creep (130℃, 8MPa, 1000h) is 0.70-0.73%. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A physical diagram of the extruder provided by the present invention;

[0017] Figure 2 This is a schematic diagram of the 1A spline of the ISO 527 standard during the tensile strength test of an embodiment of the present invention;

[0018] Figure 3 A physical picture of the creep tester provided by the present invention;

[0019] Figure 4 This is a physical picture of the creep tester provided by the present invention. DETAILED DESCRIPTION

[0020] The invention provides a creep-resistant glass fiber reinforced polypropylene material, which comprises 30-80 parts of high-isotactic homopolymer polypropylene, 10-40 parts of propylene-butene copolymer, 10-40 parts of glass fiber, 1-4 parts of maleic anhydride grafted PP and 0.2-0.6 parts of antioxidant in parts by weight.

[0021] The creep-resistant glass fiber reinforced polypropylene material provided by the present invention comprises 30 to 80 parts of high isotactic homopolypropylene by weight. In the present invention, the high isotactic homopolypropylene is preferably SK HX3300H; the indexes of the high isotactic homopolypropylene are preferably: MFR=5, isotacticity 99 parts, and tensile strength 38MPa. The present invention can improve the crystallinity of polypropylene by using high isotactic homopolypropylene, thereby making its tensile strength higher.

[0022] As an embodiment of the present invention, the mass fraction of the highly isotactic homopolypropylene can be 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts or 80 parts.

[0023] The creep-resistant glass fiber reinforced polypropylene material provided by the present invention comprises 10 to 40 parts of propylene-butene copolymer by weight. In the present invention, the propylene-butene copolymer is preferably EN02 produced by Sinopec Qingdao Refining and Chemical Co., Ltd.; the index of the propylene-butene copolymer is preferably: MFR=2.6, butene content 3%. In the present invention, the butene in the propylene-butene copolymer can provide longer side chains, increase the entanglement between molecules, and enhance the creep resistance.

[0024] As an embodiment of the present invention, the mass fraction of the propylene-butene copolymer may be 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts or 40 parts.

[0025] The creep-resistant glass fiber reinforced polypropylene material provided by the present invention comprises 10 to 40 parts of glass fiber (i.e., glass fiber) by weight. In the present invention, the glass fiber is preferably ECS10-03-508S produced by China Jushi Co., Ltd. In the present invention, the length of the glass fiber is preferably 2 to 5 mm, more preferably 3 mm; the diameter of the glass fiber is preferably 8 to 12 μm, more preferably 10 μm. In the present invention, glass fiber reinforcement can greatly improve the tensile strength and flexural strength of polypropylene.

[0026] As an embodiment of the present invention, the mass fraction of the glass fiber can be 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts or 40 parts.

[0027] The creep-resistant glass fiber reinforced polypropylene material provided by the present invention comprises 1 to 4 parts of maleic anhydride grafted PP by weight. In the present invention, the maleic anhydride grafted PP is preferably GPM200B, and more preferably Nengzhiguang polypropylene compatibilizer GPM200B from Ningbo. In the present invention, maleic anhydride grafted PP can greatly improve the compatibility of the composite material and the dispersibility of each component, thereby improving the mechanical properties of the polypropylene material.

[0028] As an embodiment of the present invention, the weight proportion of the maleic anhydride grafted PP can be 1 part, 2 parts, 3 parts or 4 parts.

[0029] The creep-resistant glass fiber reinforced polypropylene material provided by the present invention includes 0.2 to 0.6 parts of antioxidant by weight. In the present invention, the antioxidant preferably includes antioxidant 1010 and antioxidant 168; the mass ratio of the antioxidant 1010 to the antioxidant 168 is preferably 1: (0.5 to 1.5), and more preferably 1: 1. The present invention has no special limitation on the specific source of the antioxidant, and commercially available antioxidants well known to those skilled in the art can be used. The present invention can improve the antioxidant effect of polypropylene fiber by adding an antioxidant.

[0030] As an embodiment of the present invention, the weight fraction of the antioxidant may be 0.2 parts, 0.4 parts or 0.6 parts.

[0031] The present invention can improve the crystallinity of polypropylene by using high-isotactic homopolymer polypropylene, so that the tensile strength of the polypropylene material is higher; the tensile strength and bending strength of polypropylene can be greatly improved by adding glass fiber reinforcement; maleic anhydride grafted PP can greatly improve the compatibility of the composite material and the dispersibility of each component; then the butene in the propylene-butene copolymer can provide a longer side chain, increase the entanglement between molecules, and enhance the creep resistance. In the thermal management system, the operating temperature of the coolant is generally -40 to 120°C, and the liquid storage device prepared by using the creep-resistant glass fiber reinforced polypropylene material provided by the present invention has better dimensional stability and longer service life. The highly isotactic homopolypropylene used in the present invention has high crystallinity. Corresponding to the high crystallinity is a lower proportion of amorphous regions. The lower proportion of amorphous regions can reduce the occurrence of creep during the stress-bearing process of the product. The propylene part in the propylene-butene copolymer can participate in crystallization together with the highly isotactic homopolypropylene, and the butene having a longer side branch chain than olefin plays an anchoring role in the polypropylene crystal phase. Through the synergistic effect of the highly isotactic homopolypropylene and the propylene-butene copolymer, the creep resistance of the polypropylene material is further improved.

[0032] The present invention also provides a method for preparing the creep-resistant glass fiber reinforced polypropylene material described in the above technical solution, comprising: melt-extruding high-isotactic homopolymer polypropylene, glass fiber, maleic anhydride grafted PP, propylene-butene copolymer and antioxidant to obtain the creep-resistant glass fiber reinforced polypropylene material.

[0033] In the present invention, the melt extrusion is preferably carried out in an extruder. The present invention has no particular limitation on the specific model of the extruder, and an extruder well known to those skilled in the art can be used. As an embodiment of the present invention, the physical diagram of the extruder is as follows: Figure 1 shown.

[0034] In the present invention, the melt extrusion method is preferably: firstly, the highly isotactic homopolypropylene and the propylene-butene copolymer are uniformly mixed, and then sequentially pass through the first zone, the second zone and the third zone, then the mixture of maleic anhydride grafted PP and the antioxidant is added, and then sequentially pass through the fourth zone and the fifth zone, and finally the glass fiber is added, and sequentially pass through the sixth zone, the seventh zone, the eighth zone, the ninth zone and the tenth zone. The present invention performs melt extrusion in the above manner, plasticizing and mixing the highly isotactic homopolypropylene and the propylene-butene copolymer in the first zone to the third zone, mixing the maleic anhydride grafted PP and the antioxidant in the fourth zone and the fifth zone, and mixing the glass fiber in the sixth zone to the tenth zone.

[0035] In the present invention, the processing temperature of the melt extrusion is preferably: first zone: 55-65°C, second zone: 90-110°C, third zone: 140-160°C, fourth zone: 190-200°C, fifth zone: 190-200°C, sixth zone: 190-200°C, seventh zone: 180-190°C, eighth zone: 180-190°C, ninth zone: 180-190°C, tenth zone: 190-200°C, die 190-200°C, more preferably: first zone: 60°C, second zone: 100°C, third zone: 150°C, fourth zone: 200°C, fifth zone: 200°C, sixth zone: 200°C, seventh zone: 190°C, eighth zone: 190°C, ninth zone: 190°C, tenth zone: 200°C, die 200°C. The present invention has no special requirements for the pressure and extrusion speed of the melt extrusion, which can be determined according to the technical common sense of those skilled in the art. The present invention can make the components fully mixed and uniform by controlling the processing temperature of each interval during melt extrusion, thereby further improving the mechanical properties and high temperature creep resistance of the creep-resistant glass fiber reinforced polypropylene material.

[0036] The preparation process provided by the present invention is simple, and a glass fiber reinforced polypropylene material with excellent mechanical properties and high-temperature creep resistance can be obtained through mixing and melt extrusion. The main equipment required is an extruder, and other expensive equipment is not required, so the cost is low and it is conducive to large-scale industrial promotion.

[0037] The present invention also provides a liquid reservoir, which is used for storing coolant in a thermal management system. The liquid reservoir includes a shell, and the material of the shell is a creep-resistant glass fiber reinforced polypropylene material. The creep-resistant glass fiber reinforced polypropylene material includes, by mass, 30 to 80 parts of high-tactic homopolymer polypropylene, 10 to 40 parts of propylene-butene copolymer, 10 to 40 parts of glass fiber, 1 to 4 parts of maleic anhydride grafted PP and 0.2 to 0.6 parts of antioxidant.

[0038] The present invention has no particular limitation on the specific shape of the liquid reservoir, and a liquid reservoir well known to those skilled in the art for storing coolant in a thermal management system may be used.

[0039] The present invention has no particular limitation on the specific method for preparing the shell using creep-resistant glass fiber reinforced polypropylene material, and the method for preparing the shell using polypropylene material well known to those skilled in the art can be used.

[0040] The technical solutions in the present invention will be described clearly and completely below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. 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.

[0041] Example 1

[0042] A creep-resistant glass fiber reinforced polypropylene material, which is composed of 50 parts of high-isotactic homopolymer polypropylene, 20 parts of propylene-butene copolymer, 30 parts of glass fiber, 2 parts of maleic anhydride grafted PP, and 0.4 parts of antioxidant by weight.

[0043] The high-isotactic homopolymer polypropylene is SK HX3300H produced in South Korea, and the indicators of the high-isotactic homopolymer polypropylene are: MFR=5, isotacticity 99 parts, and tensile strength 38MPa; the glass fiber is ECS10-03-508S produced by China Jushi Co., Ltd., and the length of the glass fiber is 3mm, and the diameter of the glass fiber is 10μm; the maleic anhydride grafted PP is Nengzhiguang polypropylene compatibilizer GPM200B produced in Ningbo; the propylene-butene copolymer is EN02 produced by Sinopec Qingdao Refining and Chemical Co., Ltd., and the indicators of the propylene-butene copolymer are: MFR=2.6, butene content 3%; the antioxidants are antioxidant 1010 and antioxidant 168, and the mass ratio of antioxidant 1010 to antioxidant 168 is 1:1;

[0044] The preparation method of the creep-resistant glass fiber reinforced polypropylene material is as follows:

[0045] Highly isotactic homopolymerized polypropylene, glass fiber, maleic anhydride grafted PP, propylene-butene copolymer and antioxidant are melt-extruded in an extruder to obtain a creep-resistant glass fiber reinforced polypropylene material;

[0046] The melt extrusion method is as follows: firstly, the high isotactic homopolymer polypropylene and the propylene-butene copolymer are uniformly mixed, and then sequentially pass through the first zone, the second zone and the third zone, then add the mixture of maleic anhydride grafted PP and the antioxidant, and then sequentially pass through the fourth zone and the fifth zone, and finally add the glass fiber, and sequentially pass through the sixth zone, the seventh zone, the eighth zone, the ninth zone and the tenth zone;

[0047] The processing temperature of the melt extrusion is: first zone: 60°C, second zone: 100°C, third zone: 150°C, fourth zone: 200°C, fifth zone: 200°C, sixth zone: 200°C, seventh zone: 190°C, eighth zone: 190°C, ninth zone: 190°C, tenth zone: 200°C, and die head 200°C.

[0048] Example 2

[0049] A creep-resistant glass fiber reinforced polypropylene material is composed of 60 parts of high-isotactic homopolymer polypropylene, 10 parts of propylene-butene copolymer, 30 parts of glass fiber, 2 parts of maleic anhydride grafted PP, and 0.4 parts of antioxidant, based on weight parts; other conditions are the same as those in Example 1.

[0050] Comparative Example 1

[0051] A glass fiber reinforced polypropylene material, composed by weight: 70 parts of polypropylene, 30 parts of glass fiber, 2 parts of maleic anhydride grafted PP, and 0.4 parts of antioxidant;

[0052] The polypropylene is S1003 produced by Zhejiang Petrochemical Co., Ltd.; the glass fiber is ECS10-03-508S produced by China Jushi Co., Ltd., the length of the glass fiber is 3 mm, and the diameter of the glass fiber is 10 μm; the maleic anhydride grafted PP is Nengzhiguang polypropylene compatibilizer GPM200B produced by Ningbo; the antioxidants are antioxidant 1010 and antioxidant 168, and the mass ratio of antioxidant 1010 to antioxidant 168 is 1:1;

[0053] The preparation method of the glass fiber reinforced polypropylene material is:

[0054] The polypropylene, glass fiber, maleic anhydride grafted PP and antioxidant are melt-extruded in an extruder to obtain a glass fiber reinforced polypropylene material;

[0055] The melt extrusion method is: first add polypropylene, pass through the first zone, the second zone and the third zone in sequence, then add the mixture of maleic anhydride grafted PP and antioxidant, then pass through the fourth zone and the fifth zone in sequence, and finally add glass fiber, pass through the sixth zone, the seventh zone, the eighth zone, the ninth zone and the tenth zone in sequence;

[0056] The processing temperature of the melt extrusion is: first zone: 60°C, second zone: 100°C, third zone: 150°C, fourth zone: 200°C, fifth zone: 200°C, sixth zone: 200°C, seventh zone: 190°C, eighth zone: 190°C, ninth zone: 190°C, tenth zone: 200°C, and die head 200°C.

[0057] Comparative Example 2

[0058] A glass fiber reinforced polypropylene material, which is composed of 70 parts of high-tactic homopolymer polypropylene, 30 parts of glass fiber, 2 parts of maleic anhydride grafted PP, and 0.4 parts of antioxidant by weight;

[0059] The high-isotactic homopolymer polypropylene is SKHX3300H produced in South Korea, and the indicators of the high-isotactic homopolymer polypropylene are: MFR=5, isotacticity 99 parts, and tensile strength 38MPa; the glass fiber is ECS10-03-508S produced by China Jushi Co., Ltd., and the length of the glass fiber is 3mm, and the diameter of the glass fiber is 10μm; the maleic anhydride grafted PP is Nengzhiguang polypropylene compatibilizer GPM200B produced in Ningbo; the antioxidants are antioxidant 1010 and antioxidant 168, and the mass ratio of antioxidant 1010 to antioxidant 168 is 1:1;

[0060] The preparation method of the glass fiber reinforced polypropylene material is:

[0061] Highly isotactic homopolymerized polypropylene, glass fiber, maleic anhydride grafted PP and antioxidant are melt-extruded in an extruder to obtain a glass fiber reinforced polypropylene material;

[0062] The melt extrusion method is: first add high-tactic homopolymer polypropylene, pass through the first zone, the second zone and the third zone in sequence, then add the mixture of maleic anhydride grafted PP and antioxidant, then pass through the fourth zone and the fifth zone in sequence, and finally add glass fiber, pass through the sixth zone, the seventh zone, the eighth zone, the ninth zone and the tenth zone in sequence;

[0063] The processing temperature of the melt extrusion is: first zone: 60°C, second zone: 100°C, third zone: 150°C, fourth zone: 200°C, fifth zone: 200°C, sixth zone: 200°C, seventh zone: 190°C, eighth zone: 190°C, ninth zone: 190°C, tenth zone: 200°C, and die head 200°C.

[0064] Comparative Example 3

[0065] A glass fiber reinforced polypropylene material, composed by weight: 70 parts of propylene-butene copolymer, 30 parts of glass fiber, 2 parts of maleic anhydride grafted PP, and 0.4 parts of antioxidant;

[0066] The glass fiber is ECS10-03-508S produced by China Jushi Co., Ltd., with a length of 3 mm and a diameter of 10 μm; the maleic anhydride grafted PP is Nengzhiguang polypropylene compatibilizer GPM200B produced by Ningbo; the propylene-butene copolymer is EN02 produced by Sinopec Qingdao Refining and Chemical Co., Ltd., with the following indicators: MFR=2.6, butene content 3%; the antioxidants are antioxidant 1010 and antioxidant 168, and the mass ratio of antioxidant 1010 to antioxidant 168 is 1:1;

[0067] The preparation method of the glass fiber reinforced polypropylene material is:

[0068] The glass fiber, maleic anhydride grafted PP, propylene-butene copolymer and antioxidant are melt-extruded in an extruder to obtain a glass fiber reinforced polypropylene material;

[0069] The melt extrusion method is: first add propylene-butene copolymer, pass through the first zone, the second zone and the third zone in sequence, then add the mixture of maleic anhydride grafted PP and antioxidant, then pass through the fourth zone and the fifth zone in sequence, and finally add glass fiber, pass through the sixth zone, the seventh zone, the eighth zone, the ninth zone and the tenth zone in sequence;

[0070] The processing temperature of the melt extrusion is: first zone: 60°C, second zone: 100°C, third zone: 150°C, fourth zone: 200°C, fifth zone: 200°C, sixth zone: 200°C, seventh zone: 190°C, eighth zone: 190°C, ninth zone: 190°C, tenth zone: 200°C, and die head 200°C.

[0071] Comparative Example 4

[0072] A glass fiber reinforced polypropylene material, which is composed of 50 parts of polypropylene, 20 parts of propylene-butene copolymer, 30 parts of glass fiber, 2 parts of maleic anhydride grafted PP, and 0.4 parts of antioxidant by weight;

[0073] The polypropylene is S1003 produced by Zhejiang Petrochemical Co., Ltd.; the glass fiber is ECS10-03-508S produced by China Jushi Co., Ltd., the length of the glass fiber is 3mm, and the diameter of the glass fiber is 10μm; the maleic anhydride grafted PP is Nengzhiguang polypropylene compatibilizer GPM200B produced by Ningbo; the propylene-butene copolymer is EN02 produced by Sinopec Qingdao Refining and Chemical Co., Ltd., and the indicators of the propylene-butene copolymer are: MFR=2.6, butene content 3%; the antioxidants are antioxidant 1010 and antioxidant 168, and the mass ratio of antioxidant 1010 to antioxidant 168 is 1:1;

[0074] The preparation method of the glass fiber reinforced polypropylene material is:

[0075] The polypropylene, glass fiber, maleic anhydride grafted PP, propylene-butene copolymer and antioxidant are melt-extruded in an extruder to obtain a glass fiber reinforced polypropylene material;

[0076] The melt extrusion method is: firstly, polypropylene and propylene-butene copolymer are uniformly mixed, and then passed through the first zone, the second zone and the third zone in sequence, then the mixture of maleic anhydride grafted PP and antioxidant is added, and then passed through the fourth zone and the fifth zone in sequence, and finally glass fiber is added, and passed through the sixth zone, the seventh zone, the eighth zone, the ninth zone and the tenth zone in sequence;

[0077] The processing temperature of the melt extrusion is: first zone: 60°C, second zone: 100°C, third zone: 150°C, fourth zone: 200°C, fifth zone: 200°C, sixth zone: 200°C, seventh zone: 190°C, eighth zone: 190°C, ninth zone: 190°C, tenth zone: 200°C, and die head 200°C.

[0078] The properties of the glass fiber reinforced polypropylene materials obtained in Examples 1 to 2 and Comparative Examples 1 to 4 were tested, and the results are shown in Table 1:

[0079] Table 1 Properties of glass fiber reinforced polypropylene materials obtained in Examples 1 to 2 and Comparative Examples 1 to 4

[0080]

[0081] In Table 1, the melt index is tested by a melt index tester;

[0082] The test conditions for tensile strength are: temperature 23°C, tensile speed 5mm / min; the test specimen for tensile strength is the 1A specimen of ISO 527 standard, as shown in the schematic diagram Figure 2 As shown, Figure 2In the figure, l1 is 80±2mm, l2 is 109.3±3.2mm, l3 is 170mm, L is 115±1mm, r is 24±1mm, b1 is 10.0±0.2mm, b2 is 20.0±0.2mm, h is 4.0±0.2mm, and l0 is 50.0±0.5mm;

[0083] The tensile creep is tested by a creep tester, the actual picture of the creep tester is as follows: Figure 3 and Figure 4 shown.

[0084] It can be seen from Table 1 that the melt index of the creep-resistant glass fiber reinforced polypropylene material provided by the present invention at 230°C is significantly improved compared with that of Comparative Example 1 and Comparative Examples 3-4, but slightly lower than that of Comparative Example 2, and the melt index of Example 2 at 230°C is higher than that of Example 1. By comparison, it can be seen that with the increase of the content of high-isotactic homopolymer polypropylene in the glass fiber reinforced polypropylene material, the melt index of the glass fiber reinforced polypropylene material can be significantly improved, and the fluidity is better during the processing, which is conducive to the preparation of the glass fiber reinforced polypropylene material; and by comparing the tensile strength, it can be seen that with the increase of the content of high-isotactic homopolymer polypropylene in the glass fiber reinforced polypropylene material, the tensile strength shows an upward trend. When the content of high-isotactic homopolymer polypropylene in the glass fiber reinforced polypropylene material reaches more than 50 parts, the upward trend gradually tends to be gentle; by comparing the tensile creep of the glass fiber reinforced polypropylene material under different conditions, it can be seen that It can be seen that when high-isotactic homopolypropylene and propylene-butene copolymer are not added, the tensile creep value of the glass fiber reinforced polypropylene material is the largest, and the high-temperature creep resistance is the worst. When propylene-butene copolymer is used to replace a part of Zhejiang Petrochemical S1003 polypropylene, the high-temperature creep resistance of the material is slightly improved (tensile creep value), and when high-isotactic homopolypropylene or propylene-butene copolymer is used to completely replace Zhejiang Petrochemical S1003 polypropylene, the high-temperature creep resistance of the material is significantly improved. At this time, the tensile creep values ​​of the two materials are similar, indicating that the high-temperature creep resistance is similar. After compounding with high-isotactic homopolypropylene and propylene-butene copolymer, it is found that the tensile creep value of the glass fiber reinforced polypropylene material is reduced again, and the high-temperature creep resistance is further improved. High-isotactic homopolypropylene and propylene-butene copolymer can play a synergistic role to further improve the high-temperature creep resistance of the material.

[0085] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A creep-resistant glass fiber reinforced polypropylene material, which comprises, by weight, 30 to 80 parts of high-isotactic homopolymer polypropylene, 10 to 40 parts of propylene-butene copolymer, 10 to 40 parts of glass fiber, 1 to 4 parts of maleic anhydride grafted PP and 0.2 to 0.6 parts of antioxidant.

2. The creep-resistant glass fiber reinforced polypropylene material according to claim 1, characterized in that: The highly isotactic homopolymer polypropylene is SK HX3300H; the indicators of the highly isotactic homopolymer polypropylene are: MFR=5, isotacticity 99 parts, and tensile strength 38 MPa.

3. The creep-resistant glass fiber reinforced polypropylene material according to claim 1, characterized in that: The indicators of the propylene-butene copolymer are: MFR=2.6, butene content 3%.

4. The creep-resistant glass fiber reinforced polypropylene material according to claim 1, characterized in that: The length of the glass fiber is 2-5 mm, and the diameter of the glass fiber is 8-12 μm.

5. The creep-resistant glass fiber reinforced polypropylene material according to claim 1, characterized in that: The maleic anhydride grafted PP is GPM200B.

6. The creep-resistant glass fiber reinforced polypropylene material according to claim 1, characterized in that: The antioxidants include antioxidant 1010 and antioxidant 168.

7. The creep-resistant glass fiber reinforced polypropylene material according to claim 6, characterized in that: The mass ratio of the antioxidant 1010 to the antioxidant 168 is 1:(0.5-1.5).

8. The method for preparing the creep-resistant glass fiber reinforced polypropylene material according to any one of claims 1 to 7, comprising: The highly isotactic homopolymerized polypropylene, glass fiber, maleic anhydride grafted PP, propylene-butene copolymer and antioxidant are melt-extruded to obtain a creep-resistant glass fiber reinforced polypropylene material.

9. The preparation method according to claim 8, characterized in that: The processing temperature during melt extrusion is: first zone: 55-65°C, second zone: 90-110°C, third zone: 140-160°C, fourth zone: 190-200°C, fifth zone: 190-200°C, sixth zone: 190-200°C, seventh zone: 180-190°C, eighth zone: 180-190°C, ninth zone: 180-190°C, tenth zone: 190-200°C, and die head 190-200°C.

10. A liquid reservoir used in a thermal management system to store coolant, characterized in that: The liquid reservoir includes a shell, and the material of the shell is a creep-resistant glass fiber reinforced polypropylene material. The creep-resistant glass fiber reinforced polypropylene material includes, by weight, 30 to 80 parts of high-tactic homopolymer polypropylene, 10 to 40 parts of propylene-butene copolymer, 10 to 40 parts of glass fiber, 1 to 4 parts of maleic anhydride grafted PP and 0.2 to 0.6 parts of antioxidant.

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