A polyphenylene sulfide resin composition and preparation method thereof

Abstract

The present invention discloses a polyphenylene sulfide resin composition and a preparation method thereof, belonging to the field of polymer materials. The product of the present invention introduces an ethylene-acid copolymer having a specific acid content into a base polyphenylene sulfide resin having a specific pH. Under the combined action of the two resins, the GMA in the GMA-containing toughening agent can fully react with the polyphenylene sulfide resin without GMA residue, resulting in an excellent product appearance. At the same time, the toughening agent forms a cross-linked network with the ethylene-acid copolymer, further improving the toughness of the product, and the impact strength can reach 12 kJ / m 2 The above mentioned products will not have the problem of mold scale in production and have excellent comprehensive performance.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer materials, and in particular to a polyphenylene sulfide resin composition and a preparation method thereof. Background Art

[0002] In recent years, polyphenylene sulfide resin (PPS) composite materials using glass fiber as reinforcing filler have been widely used in the automotive field due to their excellent mechanical properties and flame retardancy. However, as the requirements for the integration and thin-walling of automotive parts in the automotive field gradually increase, people's requirements for the mechanical strength, especially the toughness, of glass fiber reinforced PPS composite materials are also getting higher and higher. The general solution to improve the toughness of PPS composite materials is to introduce toughening agents such as elastomer resins, especially ethylene copolymer elastomer toughening agents containing GMA (glycidyl methacrylate), because GMA reacts with the end groups of polyphenylene sulfide resins, thereby achieving high compatibility compared to other toughening agents. However, this type of toughening agent has significant defects. During the processing, the residual GMA is easily decomposed to produce volatile gases, resulting in poor appearance of the product during injection molding. If a toughening agent with a low GMA content is used, the product will not achieve the ideal toughening effect. Summary of the Invention

[0003] Based on the defects of the prior art, the present invention aims to provide a polyphenylene sulfide resin composition. This product introduces an ethylene-acid copolymer with a specific acid content into a base polyphenylene sulfide resin with a specific pH. Under the combined action of the two resins, the GMA in the GMA-containing toughening agent can fully react with the polyphenylene sulfide resin without any GMA residue. The product has excellent appearance. At the same time, the toughening agent will form a cross-linked network with the ethylene-acid copolymer, further improving the toughness of the product. The problem of mold deposit will not occur during production, and the overall performance is excellent.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A polyphenylene sulfide resin composition comprises the following components in parts by weight:

[0006] 60-90 parts of polyphenylene sulfide resin, 1-9 parts of toughening agent containing GMA chain segment, 10-50 parts of glass fiber, and 0.1-1 part of ethylene-acid copolymer;

[0007] The pH of the polyphenylene sulfide resin is ≥7, and the acid content of the ethylene-acid copolymer is 4-10%.

[0008] Preferably, the weight proportion of the polyphenylene sulfide resin is in the range of any one or both of 60 parts, 65 parts, 70 parts, 75 parts, 80 parts, 85 parts, and 90 parts; the weight proportion of the toughening agent containing the GMA segment is in the range of any one or both of 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, and 9 parts; the weight proportion of the glass fiber is in the range of any one or both of 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, and 50 parts; and the weight proportion of the ethylene acid copolymer is in the range of any one or both of 0.1 part, 0.2 part, 0.5 part, 0.8 part, and 1 part.

[0009] Preferably, in the polyphenylene sulfide resin composition, the mass content of the polyphenylene sulfide resin accounts for ≥55wt%.

[0010] Preferably, the acid content of the ethylene acid copolymer is in the range of 4%, 5%, 6%, 8%, 10%, or any two of them.

[0011] More preferably, the acid content of the ethylene-acid copolymer is 4 to 8%.

[0012] In existing polyphenylene sulfide resin composite materials, toughening agents containing GMA segments are often used to react with the end groups of the PPS matrix resin, so that the toughening agent can be fully compatible with the polyphenylene sulfide resin to improve the toughness of the product. However, the GMA segments often have incomplete reactions, causing them to continue to react and produce volatile gases during the product injection molding process, which directly leads to a lower appearance yield of the product. However, if the toughening agent content is reduced, or the content of the GMA segments in the toughening agent is reduced, the reaction between the toughening agent and the PPS resin will be insufficient, the toughening agent will not be fully compatible, and the toughness improvement of the product will not be ideal. Based on this problem, the inventors used alkaline polyphenylene sulfide resin as the base resin, introduced a toughening agent containing GMA chain segments, and further introduced an ethylene-acid copolymer containing a specific acid content as a compound modifier. Under this formula, the polyphenylene sulfide resin and the toughening agent can fully react during the product extrusion stage, making the product have excellent toughness, and the ethylene-acid copolymer can simultaneously consume the unreacted GMA chain segments in the toughening agent, so that the product will not have obvious appearance problems; at the same time, the ethylene-acid copolymer and the toughening agent will form a three-dimensional cross-linked network after the reaction, further improving the toughness of the product.

[0013] In contrast, if an acidic polyphenylene sulfide resin is selected, although its reactivity with the toughening agent is higher, the presence of its unreacted highly reactive end groups can cause mold deposit problems in the product. At the same time, this type of polyphenylene sulfide resin is prone to gassing during processing, which in turn affects the product's appearance. For ethylene-acid copolymers, the carboxyl content (i.e., acid content) is insufficient, and it cannot fully consume the residual GMA chain segments. If the carboxyl content is too high, it will lead to lower thermal stability and reduced product performance. Therefore, in order to maintain good product appearance, toughness, and processing performance, it is necessary to select the above-mentioned limited component types. In addition, if the amount of ethylene-acid copolymer added exceeds the specified range, the product's performance will also be significantly deteriorated.

[0014] The pH of the polyphenylene sulfide resin of the present invention is measured using the GB / T 9724-2007 method. The specific method is as follows: 100 g of the sample is ground to a particle size of less than 1 μm, then dispersed in 500 mL of deionized water at room temperature and allowed to stand for 24 hours. After stirring evenly, the pH value of the deionized water is measured using a pH meter.

[0015] The acid content of the ethylene-acid copolymer of the present invention can be directly measured by infrared spectroscopy quantitative method. The specific method can be determined by direct calculation method or calibration working curve method according to the type of different grafted acids and the difference in absorbance intensity.

[0016] Preferably, the pH of the polyphenylene sulfide resin is 7 to 8.5.

[0017] Preferably, the pH of the polyphenylene sulfide resin is 7-8.

[0018] Preferably, the pH of the polyphenylene sulfide resin is within the range of one or any two of 7, 7.1, 7.2, 7.3, 7.4, 7.5, 7.6, 7.7, 7.8, 7.9, and 8.

[0019] As the pH of the polyphenylene sulfide resin increases, its reactivity with the toughening agent decreases. In order to maintain the best toughness of the product, it is more appropriate to use the polyphenylene sulfide resin within the above range as the base resin.

[0020] In addition, after multiple verifications by the inventors, it was found that the polyphenylene sulfide resin of the present invention can be purchased as an existing commercial product, or can be made by synthesis, or a commercial product can be purchased in advance and its pH can be adjusted by adding additives to meet the use requirements. It can also be made by synthesis, and the reaction conditions can be adjusted during the homemade process so that the pH meets the use requirements. In these cases, the pH and melt flow rate of the polyphenylene sulfide resin obtained only need to reach the above ranges. When the pH and melt flow rate of the polyphenylene sulfide resin are maintained in a similar range, the inventors found that even if there are certain differences in parameters such as molecular weight and non-Newtonian index based on commercially available or homemade polyphenylene sulfide resins, there will be basically no significant impact on the product performance of the present invention, including the appearance of the product, mold deposit problems, and even the toughness of the product.

[0021] Preferably, the polyphenylene sulfide resin has a melt flow rate of 120 to 600 g / 10 min at 316° C. and a load of 5 kg according to GB / T 3682.2-2018.

[0022] Based on the performance requirements of the product, those skilled in the art can use polyphenylene sulfide resins of various fluidities as the base resin component of the product of the present invention. When the types within the above range are selected, the comprehensive performance of the product is optimal.

[0023] Preferably, the ethylene-acid copolymer is at least one of ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, and ethylene-maleic anhydride copolymer.

[0024] It has been verified that when the acid content is within the range specified in the present invention, the above three ethylene-acid copolymers have better performance than other types, have a higher degree of improvement in the toughness of the product, have higher reactivity with the GMA chain segment in the toughening agent, and have better appearance performance of the product.

[0025] Preferably, the toughening agent containing GMA segments is a GMA-ethylene copolymer, and the content of the GMA segments is 2 to 10%.

[0026] Preferably, the content of the GMA segment can be directly quantitatively calibrated by infrared, or tested by titration: the Mg sample to be tested is heated to reflux in an organic solvent until dissolved, and trichloroacetic acid-xylene standard solution V1 (L) (concentration C1, mol / L) is added and refluxed, followed by adding several drops of phenolphthalein reagent, and the vortex is turned on. After confirming that no flocs are precipitated in the solution, KOH-methanol standard solution (concentration C2, mol / L) is used to titrate at 75° C. until the color of the solution changes, and the volume of KOH-methanol standard solution consumed (V2 (L) is recorded. The content of the GMA segment is determined to be 14.22×(C2×V1-C1×V2) / M.

[0027] More preferably, the GMA-ethylene copolymer is at least one of n-butyl acrylate-glycidyl acrylate and ethylene-methyl acrylate-glycidyl methacrylate terpolymers.

[0028] The toughening agent containing GMA segments in the product of the present invention is preferably a GMA-ethylene copolymer with higher compatibility. At the same time, according to the use of polyphenylene sulfide resins with different fluidity as the base resin, the content of the GMA segments can be selected within the range of 2 to 10%. Under the product formulation, the product will not have obvious appearance problems.

[0029] Preferably, the glass fibers are chopped glass fibers, and the average length of the glass fibers is 4 to 5 mm and the average diameter is 10 to 12 μm.

[0030] Preferably, the components of the polyphenylene sulfide resin composition further include 0.1 to 2 parts of a processing aid.

[0031] More preferably, the processing aid is at least one of a lubricant, a colorant, and a filler.

[0032] Another object of the present invention is to provide a method for preparing the polyphenylene sulfide resin composition, comprising the following steps:

[0033] The components are mixed evenly, and then placed into a twin-screw extruder for melt extrusion to obtain the polyphenylene sulfide resin composition.

[0034] Preferably, during the melt extrusion, the temperature of each working zone of the twin-screw extruder is set to 280° C. / 280° C. / 280° C. / 280° C.; and the screw speed is 300-400 rpm.

[0035] Preferably, the toughening agent containing GMA segments is prepared into a masterbatch in advance with a portion of the polyphenylene sulfide resin, and then uniformly mixed with the remaining polyphenylene sulfide resin and other components to prepare the polyphenylene sulfide resin composition.

[0036] The inventors discovered that since the amount of toughening agent added is less than that of polyphenylene sulfide resin, the GMA segments in the toughening agent cannot fully react with the unreacted polyphenylene sulfide resin during the conventional component mixing process of the product, thereby improving the overall compatibility. However, if the toughening agent containing GMA segments and part of the polyphenylene sulfide resin are pre-prepared into a masterbatch, the toughening agent can fully react with the polyphenylene sulfide resin during the preparation of the masterbatch, and the residual GMA segments can be fully consumed when subsequently mixed with the remaining polyphenylene sulfide resin and ethylene-acid copolymer, thereby improving the toughness and appearance performance of the overall product.

[0037] More preferably, in the masterbatch, the mass ratio of the toughening agent containing the GMA segment to the polyphenylene sulfide resin is (1:9) to (3:7).

[0038] In the process of preparing the masterbatch, if the content of the toughening agent containing the GMA chain segment is too low, the overall preparation amount of the masterbatch will be large, which is not economical. However, if the content is too high, the instantaneous intensity of the reaction between the two in the masterbatch will be high, which may cause processing problems. At the same time, the residual amount of the GMA chain segment in the masterbatch will also be high, which will cause the appearance and performance of the product to deteriorate.

[0039] More preferably, the masterbatch is prepared by mixing the PPS resin and the toughening agent containing the GMA segment in a twin-screw extruder.

[0040] During the melt extrusion, the temperatures of the working zones of the twin-screw extruder are set to 220° C. / 220° C. / 220° C. / 220° C.; and the screw speed is 300-350 rpm.

[0041] Another object of the present invention is to provide use of the polyphenylene sulfide resin composition in the preparation of automotive parts.

[0042] Preferably, the automotive parts include at least one of an electronic water pump, a capacitor, a copper busbar, and an electronic control module.

[0043] The polyphenylene sulfide resin composition of the present invention has the characteristics of high toughness, especially in the application of some lightweight automotive parts. Compared with other types of plastics or common polyphenylene sulfide resin composite materials, this product has higher impact strength and stability, and at the same time has a high injection molding appearance yield, good processing performance, and high cost-effectiveness.

[0044] The beneficial effect of the present invention is that the present invention provides a polyphenylene sulfide resin composition. The product is obtained by introducing an ethylene-acid copolymer with a specific acid content into a base polyphenylene sulfide resin with a specific pH. Under the combined action of the two resins, the GMA in the GMA-containing toughening agent can fully react with the polyphenylene sulfide resin without any GMA residue. The product has excellent appearance. At the same time, the toughening agent will form a cross-linked network with the ethylene-acid copolymer, further improving the toughness of the product, and the impact strength can reach 12 kJ / m 2 The above mentioned products will not have the problem of mold scale in production and have excellent comprehensive performance. DETAILED DESCRIPTION

[0045] In order to better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments and comparative examples. Its purpose is to understand the content of the present invention in detail, rather than to limit the present invention. All other embodiments obtained by those of ordinary skill in the art without making creative work premise all fall within the protection scope of the present invention. The experimental reagents and instruments involved in the implementation of the present invention are all conventional common reagents and instruments unless otherwise specified.

[0046] Examples 1 to 11

[0047] The embodiments of the polyphenylene sulfide resin composition of the present invention include components of the polyphenylene sulfide resin composition as shown in Table 1.

[0048] The preparation method of the product comprises the following steps:

[0049] The components are mixed evenly, and then placed into a twin-screw extruder for melt extrusion to obtain the halogen-free flame-retardant polyphenylene sulfide composition.

[0050] The temperature zones of the twin-screw extruder were set to 280 / 280 / 280 / 280° C., and the screw speed was 350 rpm.

[0051] Comparative Examples 1 to 5

[0052] The difference between the comparative examples and the examples is only in the types and proportions of the components, as shown in Table 2.

[0053] Among the components described in each embodiment and comparative example,

[0054] Polyphenylene sulfide resin 1: melt flow rate of 150 g / 10 min at 316°C and 5 kg load, Chongqing Jushi New Material Technology Co., Ltd., PPS GAC02, pH = 7.1;

[0055] Polyphenylene sulfide resin 2: melt flow rate of 300 g / 10 min at 316°C and 5 kg load, Zhejiang Xinhecheng Co., Ltd., PPS1130C, pH = 7.3;

[0056] Polyphenylene sulfide resin 3: melt flow rate of 250 g / 10 min at 316°C and 5 kg load, Shandong Binhua Binyang Fuel Chemical Co., Ltd., PPS-Q250, pH = 7.1;

[0057] Polyphenylene sulfide resin 4: melt flow rate of 500 g / 10 min at 316°C and 5 kg load, Xinjiang Zhongtai Xinxin Chemical Technology Co., Ltd., PPS ZTP500, pH = 8.4;

[0058] Polyphenylene sulfide resin 5: melt flow rate of 500 g / 10 min at 316°C and 5 kg load, Zhejiang Xinhecheng Co., Ltd., PPS3450, pH = 6.6;

[0059] Glass fiber: chopped glass fiber, average fiber diameter 10 μm, average fiber length 4.5 mm, China Jushi Group, ECS10-03-584;

[0060] Toughener containing GMA segments 1: GMA-ethylene copolymer, GMA segment content is 3%, BF-7L, Sumitomo Chemical;

[0061] Toughener 2 containing GMA segments: GMA-ethylene copolymer, GMA segment content is 5%, PTW, DuPont, USA;

[0062] Toughener 3 containing GMA segments: GMA-ethylene copolymer, GMA segment content is 8%, LOTADER AX8900, SK Functional Polymer;

[0063] Ethylene-acid copolymer 1: ethylene-methacrylic acid copolymer, acid content is 4%, 4228C, Dow Chemical;

[0064] Ethylene-acid copolymer 2: ethylene-acrylic acid copolymer, acid content 5%, A-C540A, Honeywell, USA;

[0065] Ethylene-acid copolymer 3: ethylene-maleic anhydride (graft) copolymer, acid content 8%, 1105A, Mitsui Chemicals;

[0066] Ethylene-acid copolymer 4: ethylene-methacrylic acid copolymer, acid content is 2%, N0200H, Dow Chemical, USA;

[0067] Ethylene-acid copolymer 5: ethylene-methacrylic acid copolymer, acid content 12%, AN4221C, Dow Chemical, USA;

[0068] Processing aids: antioxidant, RIANOX 1098, Rianlon.

[0069] Example 9

[0070] The embodiment of the polyphenylene sulfide resin composition of the present invention differs from Example 1 only in that the preparation method of the product is: first, a toughening agent containing a GMA segment and a portion of the polyphenylene sulfide resin are prepared into a masterbatch, and then the product is prepared with the remaining polyphenylene sulfide resin and other components according to the method described in Example 1.

[0071] The masterbatch is prepared by melt-extruding the toughening agent polyphenylene sulfide resin in a twin-screw extruder to form pellets, wherein the temperature zones of the twin-screw extruder are set to 220 / 220 / 220 / 220° C. and the screw speed is 300 rpm;

[0072] In the masterbatch, the mass ratio of the toughening agent containing the GMA segment to the polyphenylene sulfide resin is 2:8.

[0073] Example 10

[0074] The embodiment of the polyphenylene sulfide resin composition of the present invention differs from Example 2 only in that the preparation method of the product is: first, a toughening agent containing a GMA segment and a portion of the polyphenylene sulfide resin are prepared into a masterbatch, and then the product is prepared with the remaining polyphenylene sulfide resin and other components according to the method described in Example 1.

[0075] The masterbatch is prepared by melt-extruding the toughening agent polyphenylene sulfide resin in a twin-screw extruder to form pellets, wherein the temperature zones of the twin-screw extruder are set to 220 / 220 / 220 / 220° C. and the screw speed is 300 rpm;

[0076] In the masterbatch, the mass ratio of the toughening agent containing the GMA segment to the polyphenylene sulfide resin is 1.5:8.5.

[0077] Example 11

[0078] The embodiment of the polyphenylene sulfide resin composition of the present invention differs from Example 1 only in that the preparation method of the product is: first, a toughening agent containing a GMA segment and a portion of the polyphenylene sulfide resin are prepared into a masterbatch, and then the product is prepared with the remaining polyphenylene sulfide resin and other components according to the method described in Example 1.

[0079] The masterbatch is prepared by melt-extruding the toughening agent polyphenylene sulfide resin in a twin-screw extruder to form pellets, wherein the temperature zones of the twin-screw extruder are set to 220 / 220 / 220 / 220° C. and the screw speed is 300 rpm;

[0080] In the masterbatch, the mass ratio of the toughening agent containing the GMA segment to the polyphenylene sulfide resin is 3.5:7.5.

[0081] Unless otherwise specified, the components and raw materials used in the examples and comparative examples of the present invention are all commercially available raw materials, and the components and raw materials used in each parallel experiment are all of the same kind.

[0082] Table 1

[0083]

[0084] Table 2

[0085] Component weight parts Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Polyphenylene sulfide resin 1 70 70 70 70 Polyphenylene sulfide resin 5 70 fiberglass 25 25 25 25 25 Toughener 2 containing GMA segments 5 5 5 5 5 Ethylene-acid copolymer 1 1.5 0.5 Ethylene-acid copolymer 4 0.5 Ethylene-acid copolymer 5 0.5 Processing aids 0.5 0.5 0.5 0.5 0.5

[0086] Effect Example 1

[0087] In order to verify the performance of the products of the present invention, the products of each embodiment and comparative example were subjected to the following performance tests, and the specific steps are as follows:

[0088] (1) Impact strength test: The products of the examples and comparative examples were subjected to an Izod notched impact test (A-notch) according to ISO 180-2000.

[0089] (2) Appearance test: Each product was continuously injection molded into a sample with a size of 100*100*2 at 300°C using a color plate mold. After 300 injection molding, the surface of the sample was observed and evaluated with A to B grades;

[0090] Among them, grade A means that there is no appearance defect on the surface of the sample;

[0091] Grade B means that there are almost no or almost no minor appearance defects on the surface of the sample, that is, the number of surface defect points is no more than 10;

[0092] Level C means that there are serious appearance defects on the surface of the sample, that is, the number of surface defect points is more than 10.

[0093] (3) Mold Deposits Test: Continuously inject 300 times, place a small iron sheet at the end of the mold to collect mold deposits. Weigh the mold deposits.

[0094] Grade A, mold deposit is within 10mg;

[0095] B level, mold deposit>10mg

[0096] The test results are shown in Tables 3 and 4.

[0097] Table 3

[0098]

[0099] Table 4

[0100] Component weight parts Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 <![CDATA[Impact strength (KJ / m 2 )]]> 15 9 11 8 20 Appearance grade C C C C C Is there mold scale? B B B B B

[0101] It can be seen from Tables 3 and 4 that the impact strength of the products of each embodiment of the present invention can reach 12KJ / m 2As mentioned above, the appearance grade can reach A to B level, and mold deposit will not occur during the production process. From the comparison between Examples 1 to 3 and Example 4, it can be seen that when the pH of the polyphenylene sulfide resin in the product is too high, its reaction activity with the toughening agent containing GMA segments becomes low, which makes the toughness of the product of Example 4 lower. From the performance of the products of Examples 1 and Examples 7 to 8, it can be seen that when the ethylene-acid copolymer is at least one of ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, and ethylene-methacrylic acid-acrylic acid copolymer, the toughness and appearance of the product are better. Furthermore, from Examples 1 to 2 and Examples 9 to 11, it can be seen that when the toughening agent containing GMA segments is pre-prepared in the form of a masterbatch, the appearance performance of the resulting product is better, but it is necessary to pay attention to the content of the toughening agent containing GMA segments in the masterbatch. If the content is too high, as shown in Example 11, the toughness of the product will be weakened to a certain extent. In contrast, the product of Comparative Example 1 does not contain ethylene-acid copolymer, and the residual GMA segments in the product cannot be effectively removed, generating volatile gases during injection molding, resulting in poor product appearance and performance. In Comparative Example 2, the amount of ethylene-acid copolymer added is too much, significantly weakening the physical properties of the product. In Comparative Examples 3 and 4, the acid content of the ethylene-acid copolymer is either too low or too high, resulting in unsatisfactory product performance, indicating that the acid content in the ethylene-acid copolymer must be maintained within a specific range. The base resin used in the product of Comparative Example 5 is acidic. Although its reactivity with the toughening agent is higher and the product has higher toughness, it can cause mold deposits to form during the production process.

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to 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 essence and scope of the technical solutions of the present invention.

Claims

1. A polyphenylene sulfide resin composition, characterized in that The composition comprises the following components in parts by weight: 60-90 parts of polyphenylene sulfide resin, 1-9 parts of toughening agent containing GMA chain segment, 10-50 parts of glass fiber, and 0.5 parts of ethylene-acid copolymer; The toughening agent containing GMA segments is at least one of n-butyl acrylate-glycidyl ester and ethylene-methyl acrylate-glycidyl methacrylate terpolymer, and the content of the GMA segments is 2-10%; the ethylene-acid copolymer is at least one of ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, and ethylene-maleic anhydride copolymer; The polyphenylene sulfide resin has a pH value of 7 to 8 as tested according to the GB / T 9724-2007 method, and the pH value is not equal to 7. During the test, 100 g of the sample is ground to a particle size of less than 1 μm, then dispersed in 500 mL of deionized water at room temperature and allowed to stand for 24 hours. After stirring evenly, the pH value of the deionized water is measured using a pH meter; The acid content of the ethylene-acid copolymer measured by infrared spectroscopy quantitative method is 4-8%.

2. The polyphenylene sulfide resin composition according to claim 1, wherein The polyphenylene sulfide resin has a melt flow rate of 120-600 g / 10 min at 316° C. and a load of 5 kg according to GB / T3682.2-2018.

3. The polyphenylene sulfide resin composition according to claim 1, wherein The glass fibers are chopped glass fibers, and the average length of the glass fibers is 4-5 mm, and the average diameter is 10-12 μm.

4. The polyphenylene sulfide resin composition according to claim 1, wherein The components of the polyphenylene sulfide resin composition further include 0.1 to 2 parts of a processing aid; the processing aid is at least one of a lubricant and a colorant.

5. The method for preparing the polyphenylene sulfide resin composition according to any one of claims 1 to 4, wherein: The following steps are involved: The components are mixed evenly, and then placed into a twin-screw extruder for melt extrusion to obtain the polyphenylene sulfide resin composition.

6. The method for preparing the polyphenylene sulfide resin composition according to claim 5, wherein: The toughening agent containing the GMA chain segment is prepared into a master batch in advance with a portion of the polyphenylene sulfide resin, and then uniformly mixed with the remaining polyphenylene sulfide resin and other components to prepare the polyphenylene sulfide resin composition.

7. The method for preparing the polyphenylene sulfide resin composition according to claim 6, wherein: In the masterbatch, the mass ratio of the toughening agent containing the GMA chain segment to the polyphenylene sulfide resin is (1:9) to (3:7).

8. Use of the polyphenylene sulfide resin composition according to any one of claims 1 to 4 in the preparation of automotive parts.

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