PPS modified material with high modulus and high weld mark performance and preparation method thereof

Abstract

The invention belongs to the technical field of high polymer materials, and discloses a high-modulus and high-weld-mark performance PPS modified material which comprises the following raw materials in parts by weight: 42-59 parts of linear PPS resin; 40 to 50 parts of glass fiber; 0-4 parts of an elastomer; and 0.01 to 0.3 part of a coupling agent. A product prepared from the raw materials disclosed by the invention has relatively high bending modulus and good weld mark performance, and meets the requirements of the frameless glass lifter bracket on key performance indexes of an ideal material; in addition, the invention further provides a preparation method of the material, and the preparation method is simple, easy to implement and suitable for large-scale production.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer materials, and in particular to a PPS modified material with high modulus and high weld mark performance and a preparation method thereof. Background Art

[0002] With the development of the modern automotive industry, frameless doors have gradually become standard features on mid- and high-end vehicles. As a key component, the frameless window lift bracket plays a crucial role. Its core function is to assemble and secure the glass through screw mounting holes, and then precisely control the glass's position in the Y direction (perpendicular to the glass plane and parallel to the vehicle's width). This ensures the glass remains stable and smooth during the lifting process, avoiding undesirable phenomena such as shaking and deflection. This has a significant impact on improving the overall performance and sealing of the door glass system, as well as driving and riding comfort and safety.

[0003] In actual production and application, the bracket components of frameless glass lifters are typically made of ADC1 aluminum alloy and require die-casting. This results in high part weight and complex assembly. Using PPS as a replacement can achieve lightweight and low-cost results, but a PPS modified material with high modulus and high weld mark performance is required to ensure high rigidity for the bracket components while also ensuring that the assembly holes do not crack due to the high weld mark performance. However, among the PPS materials available on the market, there are modifications with high modulus and modifications with high weld mark performance, but no implementation has been found that can simultaneously meet both high modulus and high weld mark requirements. During the screw assembly process, if the material used for the bracket components performs poorly, quality issues such as cracking are very likely to occur at the assembly holes. This not only leads to part scrapping and increased production costs, but can also affect the assembly accuracy and reliability of the entire door glass system, negatively impacting the overall quality of the vehicle.

[0004] Currently, there are a variety of modified linear PPS resin materials on the market, such as the patent publication number CN116904030A, entitled "A High-Strength, High-Modulus PPS Reinforced Resin and Its Preparation Method." While this patent provides a high-strength, high-modulus PPS reinforced resin with high flexural modulus, tensile strength, and attractive appearance, it focuses on improving the flexural modulus to enhance the material's rigidity. However, its weld line performance is subpar, failing to meet the strength requirements of assembly holes under high stress. Other PPS materials on the market focus on improving weld line performance but struggle to achieve the desired flexural modulus, resulting in insufficient overall part rigidity. An ideal material should simultaneously meet the following key performance indicators: a flexural modulus greater than 18 GPa to ensure sufficient part rigidity; a weld line tensile stress greater than 70 MPa, and a weld line elongation of at least 0.65% to prevent quality issues such as cracking during screw assembly. Therefore, there is an urgent need in the field to develop a PPS modified material with both high modulus and high weld line performance that meets these key performance indicators. Summary of the Invention

[0005] The purpose of the present invention is to provide a PPS modified material with high modulus and high weld mark performance. The raw materials are simple, and the prepared product has a high flexural modulus and good weld mark performance, which can meet the key performance index requirements of the ideal material for frameless glass lift brackets.

[0006] The technical solution adopted to achieve the purpose of the present invention is: a PPS modified material with high modulus and high weld mark performance, comprising the following raw materials in parts by weight:

[0007] Linear PPS resin: 42-59 parts;

[0008] Glass fiber: 40-50 parts;

[0009] Elastomer: 0-4 parts;

[0010] Coupling agent: 0.01 to 0.3 parts.

[0011] Furthermore, the glass fiber is a high modulus glass fiber.

[0012] Furthermore, the elastomer is ethylene-glycidyl ester copolymer; and the coupling agent is ethyltrimethoxysilane.

[0013] Furthermore, the viscosity index of the linear PPS resin is 40 g / 10 min to 300 g / 10 min.

[0014] Furthermore, in step S1 , a coupling agent is added before feeding the linear PPS resin and the mixture is thoroughly mixed.

[0015] Another object of the present invention is to provide a method for preparing a PPS modified material with high modulus and high weld line performance, which is easy to implement and suitable for large-scale production.

[0016] The technical solution used to achieve another object of the present invention is: a method for preparing a PPS modified material with high modulus and high weld mark performance, which specifically includes the following steps:

[0017] Step S1: linear PPS resin, elastomer, and coupling agent are put into a high-speed mixer for stirring and mixing;

[0018] Step S2: feeding the glass fiber and the mixture obtained in step S1 into a twin-screw extruder respectively using a feeder;

[0019] Step S3, mixing, melting, and conveying the glass fiber and the mixture obtained in step S1 in a twin-screw extruder, conveying the glass fiber and the mixture to a die head from a feed port, and extruding the mixture from the die head to obtain a glass fiber-filled linear PPS plastic melt;

[0020] Step S4: Cooling and pelletizing the glass fiber filled linear PPS plastic melt to obtain glass fiber filled linear PPS plastic particles.

[0021] Furthermore, in step S3, the screw temperatures in each section from the feed port to the die head are as follows: in the first section, the screw temperature is controlled within the range of 265-275°C; in the second to seventh sections, the screw temperatures are all controlled within the range of 295-305°C.

[0022] Furthermore, in step S3, the screw speed is controlled within the range of 295-305 rpm, and the melt temperature is monitored and controlled within the range of 350-380°C.

[0023] The present invention has the beneficial effect of producing products using the raw materials of the present invention with high flexural modulus and excellent weld mark performance, meeting the requirements of ideal key material performance indicators. When the material of the present invention is used as the raw material for the bracket components of frameless glass lifters, the high modulus of the material imparts excellent rigidity to the bracket components, effectively resisting deformation under the weight of the glass and various external forces, maintaining precise control of the glass's posture. High weld mark performance is crucial, as weld marks are unavoidable defects in the plastic molding process, often with lower strength than the original material. It also ensures that the assembly holes will not crack or suffer quality issues such as cracking during screw assembly. DETAILED DESCRIPTION

[0024] The examples are provided to better illustrate the present invention, but are not intended to limit the present invention to the examples. Therefore, non-essential improvements and adjustments to the embodiments made by those skilled in the art based on the above-mentioned invention still fall within the scope of protection of the present invention.

[0025] Example 1

[0026] A PPS modified material with high modulus and high weld mark performance comprises the following raw materials in parts by weight:

[0027] Linear PPS resin: 59.7 parts;

[0028] Glass fiber: 40 parts;

[0029] Coupling agent: 0.3 parts.

[0030] Among them, the glass fiber is ordinary glass fiber (E-GF ordinary glass fiber, purchased from Chongqing International Composite Materials Co., Ltd., glass fiber model ECS309A); the coupling agent is ethyltrimethoxysilane; the melt flow rate (i.e., Melt Flow Rate, MFR for short) of the linear PPS resin is 200g / 10min, and the coupling agent is added to the linear PPS resin and fully mixed with the linear PPS resin.

[0031] The method for preparing the PPS modified material using the above materials specifically comprises the following steps:

[0032] Step S1: linear PPS resin and coupling agent are put into a high-speed mixer for stirring and mixing.

[0033] Step S2: using a feeder to feed the glass fiber and the mixture obtained in step S1 into a twin-screw extruder respectively.

[0034] In step S3, the glass fiber and the mixture obtained in step S1 are mixed, melted, and conveyed forward in a twin-screw extruder, conveyed from a feed port to a die head, and extruded from the die head to obtain a glass fiber-filled linear PPS plastic melt.

[0035] In this step, the twin-screw extruder used in the present invention is an existing machine, specifically a co-rotating twin-screw extruder produced by Japan Steel Works. The screw temperatures in each section from the feed port to the die are as follows: in the first section, the screw temperature is controlled within the range of 270°C; in the second to seventh sections, the screw temperature is controlled at 300°C. The screw speed is controlled at 300 rpm, and the melt temperature is monitored and controlled at 370°C.

[0036] Step S4: Cooling and pelletizing the glass fiber filled linear PPS plastic melt to obtain glass fiber filled linear PPS plastic particles.

[0037] Examples 2-3, Comparative Example 1, Comparative Example 2

[0038] Examples 2-3, Comparative Examples 1, and Comparative Example 2 utilize the same raw material types and processing methods as Example 1. The only difference lies in the raw material ratios. Specifically, the weight ratios of linear PPS resin to glass fiber per 100 parts by weight of the material in Examples 2-3, Comparative Examples 1, and Comparative Example 2 differ from that in Example 1. A comparison of the weight ratios of the various raw materials per 100 parts by weight of the material in Examples 1-3, Comparative Examples 1, and Comparative Example 2 is shown in Table 1 below.

[0039] Table 1 Comparison of weight parts of each raw material in Examples 1-3, Comparative Example 1 and Comparative Example 2

[0040] raw material Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Linear PPS resin / part 59.7 54.7 49.7 69.7 44.7 E-GF ordinary glass fiber / part 40 45 50 30 55 Coupling agent / part 0.3 0.3 0.3 0.3 0.3 Total / share 100 100 100 100 100

[0041] The products of Examples 1-3, Comparative Example 1, and Comparative Example 2 were tested to determine their corresponding tensile strength, elongation at break, flexural strength, flexural modulus, weld line stress, weld line strain, and processability. The test results are shown in Table 2 below.

[0042] The methods for detecting the above parameters are all existing methods. For example, the tensile strength and elongation at break are tested using the ASTM D638 (Standard test method for tensile properties of plastics) or ISO 527 (Determination of tensile properties of plastics) test standard; the flexural strength and flexural modulus are tested using the ASTM D790 (Test method for flexural properties of plastics) or ISO 178 (Determination of flexural properties of plastics) test standard; the weld mark stress and strain are tested using the ASTM D638 (Standard test method for tensile properties of plastics) or ISO 527 (Determination of tensile properties of plastics) test standard.

[0043] Test conditions: tensile test speed: 5mm / min, weld mark test speed: 1mm / min, bending test speed: 2mm / min

[0044] Ambient temperature: 23±2℃, humidity: 50%RH

[0045] Table 2 Comparison of product performance tests of Examples 1-3, Comparative Example 1, and Comparative Example 2

[0046] Test items Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Tensile strength / MPa 180 195 185 150.0 188.0 Elongation at break / % 1.7 1.6 1.6 1.5 1.2 Bending strength / MPa 270 284 275 220.0 281.0 Flexural modulus / GPa 15 17.5 18 12.0 21.5 Weld mark stress / MPa 73 71 70 75.0 64.0 Weld line strain / % 0.53 0.53 0.5 0.6 0.4 Processability ○ ○ ○ ○ ○

[0047] Note: In the processability, ○ represents excellent processability of granulation extrusion, △ represents good processability of granulation extrusion, and × represents great difficulty in granulation extrusion and poor processability.

[0048] According to the results of Table 2 above, in a fixed weight portion of material (i.e., 100 parts by weight), in Examples 1-3, Comparative Example 1, and Comparative Example 2, as the proportion of glass fiber increases, the increase in the flexural modulus decreases, while the strength first increases and then decreases, and when the glass fiber is 45 parts (i.e., Example 2), the comprehensive strength and modulus are the highest. The proportion of glass fiber in Comparative Example 1 is too small, which results in its flexural modulus being too small; the proportion of glass fiber in Comparative Example 2 is too large, and although the flexural modulus is large, the weld mark performance is poor and brittle fracture is prone to occur. Therefore, among Examples 1-3, Comparative Example 1, and Comparative Example 2, Example 2 is preferred as the best embodiment.

[0049] Example 4

[0050] The glass fiber in Example 2 is ordinary glass fiber. In order to further explore the influence of glass fiber type on product performance, the present invention also designs Example 4.

[0051] Compared with Example 2, Example 4 has the same processing method. The only difference is the type of raw glass fiber. Example 2 is E-GF ordinary glass fiber, and Example 4 is TM-GF high modulus glass fiber. The composition and performance comparison of E-GF ordinary glass fiber and TM-GF high modulus glass fiber are shown in Table 3 below.

[0052] Table 3 Comparison of the composition and properties of E-GF ordinary glass fiber and TM-GF high modulus glass fiber

[0053]

[0054] The specific comparison of the weight parts of each raw material in Example 2 and Example 4 per 100 parts by weight of the material is shown in Table 4 below.

[0055] Table 4 Comparison of weight parts of each raw material in Example 2 and Example 4

[0056] raw material Example 2 Example 4 Linear PPS resin / part 54.7 54.7 Glass fiber / part 45 45 Coupling agent / part 0.3 0.3 Total / share 100 100 Glass fiber types E-GF ordinary glass fiber TM-GF high modulus glass fiber

[0057] The product of Example 4 was tested using the product testing method of Example 2 to test the corresponding tensile strength, elongation at break, flexural strength, flexural modulus, weld line stress, weld line strain and processability. The test results are compared with the test results of Example 2 as shown in Table 5 below.

[0058] Table 5 Comparison of the product test results of Example 4 and the test results of Example 2

[0059] Test items Example 2 Example 4 Tensile strength / MPa 195 209 Elongation at break / % 1.6 1.6 Bending strength / MPa 284 304 Flexural modulus / GPa 17.5 19 Weld mark stress / MPa 71 72 Weld line strain / % 0.53 0.54 Processability ○ ○

[0060] Note: In the processability, ○ represents excellent processability of granulation extrusion, △ represents good processability of granulation extrusion, and × represents great difficulty in granulation extrusion and poor processability.

[0061] The results in Table 5 above show that, given a fixed weight of material, with the same raw material types, proportions, and processing methods, the product produced using high modulus glass fiber has better overall performance than that produced using conventional glass fiber. Therefore, the glass fiber of the present invention is preferably high modulus glass fiber.

[0062] Examples 5-7

[0063] In order to further explore the effect of linear PPS resin MFR on product performance, the present invention also designed Examples 5-7 based on Example 4.

[0064] Compared with Example 4, Examples 5-7 have the same raw material types, proportions, and processing methods. The only difference is the MFR of the linear PPS resin. The MFR comparison of the PPS resins of Examples 4-7 is shown in Table 6 below.

[0065] Table 6 Comparative table of MFR of PPS resins of Examples 4-7

[0066]

[0067] The products of Examples 5-7 were tested using the product testing method of Example 4 to test the corresponding tensile strength, elongation at break, flexural strength, flexural modulus, weld line stress, weld line strain and processability. The test results are compared with the test results of Example 4 as shown in Table 7 below.

[0068] Table 7 Comparison of product test results of Examples 5-7 and test results of Example 4

[0069] Test items Example 4 Example 5 Example 6 Example 7 Tensile strength / MPa 209 210 211 214 Elongation at break / % 1.6 1.6 1.6 1.6 Bending strength / MPa 304 300 305 306 Flexural modulus / GPa 19 18.2 18.1 18.1 Weld mark stress / MPa 72 68 73 73 Weld line strain / % 0.54 0.5 0.58 0.6 Processability ○ ○ △ ×

[0070] Note: In the processability, ○ represents excellent processability of granulation extrusion, △ represents good processability of granulation extrusion, and × represents great difficulty in granulation extrusion and poor processability.

[0071] The data in Table 6 show that the viscosity index ranking from highest to lowest is: Example 5 > Example 4 > Example 6 > Example 7. The results in Table 7 indicate that the weld line performance of Examples 4, 6, and 7 is slightly improved compared to that of Example 5. This indicates that decreasing the MFR of the linear PPS resin slightly improves the weld line performance; however, as the MFR of the linear PPS resin decreases, processability decreases. Based on a comprehensive analysis of the overall product performance, Example 4 offers the best overall performance among Examples 4-7. Therefore, Example 4 is preferred as the best example among Examples 4-7.

[0072] Examples 8-9, Comparative Example 3

[0073] In order to further improve the performance of the PPS material, the present invention also designed Examples 8-9 and Comparative Example 3 based on Example 4.

[0074] In terms of raw materials: Compared with Example 4, Examples 8-9 and Comparative Example 3 have the same types, proportions and MFR (200g / 10min) of other raw materials as Example 4. The only difference is that: Examples 8-9 and Comparative Example 3 further add an elastomer on the basis of Example 4, and the elastomer is ethylene-glycidyl ester copolymer (E / GMA), which is purchased from Sumitomo Chemical Co., Ltd., and the weight proportion of the linear PPS resin in 100 parts by weight of the material changes after the elastomer is added.

[0075] In terms of preparation method: In the preparation of products in Examples 8-9 and Comparative Example 3, an elastomer processing step is added.

[0076] The specific comparison of the weight parts of each raw material in Examples 8-9, Comparative Example 3 and Example 4 per 100 parts by weight of the material is shown in Table 8 below.

[0077] Table 8 Comparison of weight parts of each raw material in Examples 8-9, Comparative Example 3 and Example 4

[0078] raw material Example 4 Example 8 Example 9 Comparative Example 3 Linear PPS resin / part 54.7 52.7 50.7 48.7 Glass fiber / part 45 45 45 45 Coupling agent / part 0.3 0.3 0.3 0.3 Elastomer / part 0 2 4 6 Total / share 100 100 100 100 Elastomer E / GMA E / GMA E / GMA E / GMA

[0079] The preparation methods of Examples 8-9 and Comparative Example 3 specifically include the following steps:

[0080] Step S1: linear PPS resin, elastomer, and coupling agent are put into a high-speed mixer for stirring and mixing.

[0081] Step S2: using a feeder to feed the glass fiber and the mixture obtained in step S1 into a twin-screw extruder respectively.

[0082] In step S3, the glass fiber and the mixture obtained in step S1 are mixed, melted, and conveyed forward in a twin-screw extruder, conveyed from a feed port to a die head, and extruded from the die head to obtain a glass fiber-filled linear PPS plastic melt.

[0083] The twin-screw extruder used in the present invention is an existing machine, specifically a co-rotating twin-screw extruder manufactured by Japan Steel Works. The screw temperatures in each section from the feed port to the die are controlled as follows: in the first section, the screw temperature is controlled within the range of 270°C; in sections 2 through 7, the screw temperature is controlled at 300°C. The screw speed is controlled at 300 rpm, and the melt temperature is monitored and controlled at 370°C.

[0084] Step S4: Cooling and pelletizing the glass fiber filled linear PPS plastic melt to obtain glass fiber filled linear PPS plastic particles.

[0085] The above method was used to process the materials of Examples 8-9 and Comparative Example 3 to prepare products, and the product testing method of Example 4 was used to test the products of Examples 8-9 and Comparative Example 3 to test the corresponding tensile strength, elongation at break, flexural strength, flexural modulus, weld mark stress, weld mark strain and processability. The test results are compared with the test results of Example 4 as shown in Table 7 below.

[0086] Table 9 Comparison of the test results of the products of Examples 8-9 and Comparative Example 3 with the test results of Example 4

[0087]

[0088]

[0089] The results in Table 8 show that, within 100 parts by weight of the material, increasing the elastomer content leads to improved weld line performance, but with some decreases in flexural strength and flexural modulus. Based on the above parameter comparison, Example 8 achieves the best overall performance. Therefore, Example 8 is the preferred embodiment over Examples 4, 8-9, and Comparative Example 3.

[0090] Comparative Example 4

[0091] In order to further explore the influence of the type of elastomer on the material properties, the present invention also designed Comparative Example 4 based on Example 8.

[0092] The raw material ratio and processing method of Comparative Example 4 are exactly the same as those of Example 8. The only difference is the type of elastomer. Specifically, in every 100 parts by weight of the material, the elastomer in Example 8 is E / GMA, and the elastomer in Comparative Example 4 is polyoxymethylene grafted maleic anhydride (POM-g-MAH), which is purchased from Xinyue Manufacturing Co., Ltd. The specific comparison of the weight parts of each raw material in Comparative Example 4 and Example 8 is shown in Table 10 below.

[0093] Table 10 Comparison of weight of each raw material in Comparative Example 4 and Example 8

[0094] raw material Example 8 Comparative Example 4 Linear PPS resin / part 52.7 52.7 Glass fiber / part 45 45 Coupling agent / part 0.3 0.3 Elastomer / part 2 2 Total / share 100 100 Elastomer E / GMA POM-g-MAH

[0095] The material of Example 8 was processed to prepare a product, and the product testing method of Example 8 was used to test the product of Comparative Example 4 to test the corresponding tensile strength, elongation at break, flexural strength, flexural modulus, weld mark stress, weld mark strain and processability. The test results are compared with the test results of Example 8 as shown in Table 11 below.

[0096] Table 11 Comparison of the test results of the product of comparative example 4 and the test results of embodiment 8

[0097] Test items Example 8 Comparative Example 4 Tensile strength / MPa 200 185.0 Elongation at break / % 1.8 2.1 Bending strength / MPa 296 290.0 Flexural modulus / GPa 18.2 14.0 Weld mark stress / MPa 72 73.0 Weld line strain / % 0.65 0.7 Processability ○ ○

[0098] As can be seen from the results of Table 11, the flexural modulus and complete strength of Example 8 are higher than those of Comparative Example 4, and the weld line performance gap is not large. That is, on the basis of the identical types of other raw materials, proportions, and processing methods, the elastomer adopts E / GMA compared with POM-g-MAH, which can make the overall performance of the material better. Therefore, among Example 8 and Comparative Example 4, Preferred Example 8 is the best embodiment.

[0099] The material prepared using the raw materials of the present invention exhibits a high flexural modulus and excellent weld mark performance. Among the key performance indicators, the flexural modulus must be greater than 18 GPa, ensuring sufficient rigidity for the component. The weld mark tensile stress must be greater than 70 MPa, and the weld mark elongation must be no less than 0.65%, meeting the key performance indicators required for an ideal material for a frameless glass lifter bracket. For bracket components, excellent weld mark performance ensures that the assembly holes will not crack due to insufficient strength at the weld mark when subjected to the enormous stress of screw assembly, thereby ensuring the service life and reliability of the component. When used as the raw material for frameless glass lifter bracket components, the material of the present invention exhibits a high flexural modulus and excellent weld mark performance. The material's high modulus properties impart excellent rigidity to the bracket components, effectively resisting deformation under the weight of the glass and various external forces, maintaining precise control of the glass's position. High weld mark performance is crucial, as weld marks are unavoidable defects in the plastic molding process and often have lower strength than the material itself. It also ensures that the assembly holes will not crack during screw assembly, resulting in quality issues such as cracking.

[0100] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be covered by the scope of the claims of the present invention.

Claims

1. A PPS modified material with high modulus and high weld line performance, characterized in that: The invention comprises the following raw materials in parts by weight: Linear PPS resin: 42-59 parts; Glass fiber: 40-50 parts; Elastomer: 0-4 parts; Coupling agent: 0.01 to 0.3 parts.

2. The PPS modified material with high modulus and high weld mark performance according to claim 1, characterized in that The glass fiber is a high modulus glass fiber.

3. The PPS modified material with high modulus and high weld mark performance according to claim 1 or 2, characterized in that: The elastomer is ethylene-glycidyl ester copolymer; the coupling agent is ethyltrimethoxysilane.

4. The PPS modified material with high modulus and high weld mark performance according to claim 1 or 2, characterized in that: The melt flow rate of the linear PPS resin is 40 g / 10 min to 300 g / 10 min.

5. The PPS modified material with high modulus and high weld mark performance according to claim 3, characterized in that: The melt flow rate of the linear PPS resin is 40 g / 10 min to 300 g / 10 min.

6. A method for preparing a PPS modified material with high modulus and high weld line performance, characterized in that: The specific steps include: Step S1: linear PPS resin, elastomer, and coupling agent are put into a high-speed mixer for stirring and mixing; Step S2: feeding the glass fiber and the mixture obtained in step S1 into a twin-screw extruder respectively using a feeder; Step S3, mixing, melting, and conveying the glass fiber and the mixture obtained in step S1 in a twin-screw extruder, conveying the glass fiber and the mixture to a die head from a feed port, and extruding the mixture from the die head to obtain a glass fiber-filled linear PPS plastic melt; Step S4: Cooling and pelletizing the glass fiber filled linear PPS plastic melt to obtain glass fiber filled linear PPS plastic particles.

7. The method for preparing a PPS modified material with high modulus and high weld mark performance according to claim 6, wherein: In step S3, the screw temperatures in each section from the feed port to the die head are as follows: in the first section, the screw temperature is controlled within the range of 265-275°C; in the second to seventh sections, the screw temperatures are all controlled within the range of 295-305°C.

8. The method for preparing a PPS modified material with high modulus and high weld mark performance according to claim 6, wherein: In step S3, the screw speed is controlled within the range of 295-305 rpm, and the melt temperature is monitored and controlled within the range of 350-380°C.

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