Marble-like color master batch based on melt rheological difference regulation and preparation method thereof

Abstract

This application relates to the field of polymer materials technology, and in particular to a marble-like color masterbatch based on melt rheology difference regulation and its preparation method. The marble-like color masterbatch based on melt rheology difference regulation comprises the following raw materials: rheology control carrier resin, effect pigments, interface compatibilizers, and structuring processing aids; the rheology control carrier resin is composed of polymethyl methacrylate (PMMA) and styrene-acrylonitrile copolymer (SAN) in a ratio of 4:(2-3); the melt flow rate (MFR) of the target matrix resin is... 基体 Melt Flow Rate (MFR) of Rheology Control Carrier Resin 载体 The ratio is (2-6):1. This application uses PMMA and SAN in a specific ratio as a rheology control carrier resin, precisely controls the melt flow rate ratio between PMMA and the target matrix resin, and combines it with optimized processes to improve the mechanical properties of the marble-look masterbatch, resulting in excellent marble-look simulation and dispersibility, stable processing, and wide applicability.

Description

Technical Field

[0001] This application relates to the field of polymer materials technology, and in particular to a marble-like color masterbatch based on melt rheological difference regulation and its preparation method. Background Technology

[0002] In the fields of home appliance casings, consumer electronics, cosmetic packaging, high-end daily necessities, and decorative building materials, the texture effect of imitation natural stone (such as marble and granite) is highly favored due to its unique decorative properties and high-end feel.

[0003] In related technologies, the traditional incompatible masterbatch method is often used to form marble-like patterns. This method involves adding a masterbatch made of a carrier resin that is completely incompatible with the base resin to the base resin. During injection molding, due to the incompatibility of the two phases, the masterbatch melt is stretched into strips under shear force, thus forming a flow-like effect. However, due to the extremely weak interfacial bonding between the two phases, the flow-like area of ​​the product becomes a mechanical weak point, resulting in a significant decrease in impact strength and tensile strength, making the product brittle and causing serious deterioration of mechanical properties.

[0004] Therefore, there is an urgent need for a solution that can stably achieve marble-like textures without compromising the mechanical properties of masterbatch products. Summary of the Invention

[0005] In order to ensure the mechanical properties of imitation marble pattern masterbatch products, this application provides an imitation marble pattern masterbatch based on melt rheological difference control and its preparation method.

[0006] In a first aspect, this application provides a marble-like color masterbatch based on melt rheological difference control, employing the following technical solution: A marble-like color masterbatch based on melt rheological difference regulation, comprising, by weight, the following raw materials: 40-70 parts of rheology control carrier resin; Effect pigments: 10-30 parts; Interface compatibilizer: 10-15 parts; Structured processing aid: 0.5-3 parts; The rheology control carrier resin is composed of polymethyl methacrylate (PMMA) and styrene-acrylonitrile copolymer (SAN) in a ratio of 4:(2-3). The color masterbatch is used to mix with the target matrix resin, which is a styrene-based polymer; The melt flow rate (MFR) of the target matrix resin 基体 With respect to the melt flow rate (MFR) of the rheology-controlled carrier resin 载体 The ratio is (2-6):1.

[0007] By adopting the above technical solution, since the rheology control carrier resin is limited to a 4:(2-3) blend of PMMA and SAN, and the ratio of MFR matrix to MFR carrier is controlled at (2-6):1, a moderate melt rheological difference between the carrier and the matrix is ​​ensured. This not only forms a natural and continuous marble pattern, but also avoids texture disorder or disappearance caused by improper rheological difference. At the same time, through the blending of PMMA and SAN and the synergistic effect of the interface compatibilizer, the interfacial bonding force between the carrier and the matrix is ​​enhanced, significantly improving the impact strength and tensile strength of the product. In addition, the color masterbatch has good processing stability, is suitable for a variety of styrene-based matrix resins, and has wide industrial applicability.

[0008] Preferably, the melt flow rate (MFR) of the target matrix resin is... 基体 With respect to the melt flow rate (MFR) of the rheology-controlled carrier resin 载体 The ratio is (3-5):1.

[0009] By adopting the above technical solution, the MFR ratio is further limited to (3-5):1. This preferred ratio puts the rheological difference between the carrier and the matrix in the "optimal window". Under the premise of ensuring clear texture formation, the interfacial compatibility and stress transfer efficiency between the carrier and the matrix are further optimized, thereby improving the naturalness and continuity of the imitation marble texture. At the same time, the impact strength and tensile strength of the product are better balanced, the melt stability during the processing is better, and the process tolerance is higher.

[0010] Preferably, the styrene-based polymer is selected from any one of acrylonitrile-butadiene-styrene copolymer (ABS), methyl methacrylate-acrylonitrile-butadiene-styrene copolymer (MABS), styrene-acrylonitrile copolymer (SAN), and high-impact polystyrene (HIPS).

[0011] Preferably, the interface compatibilizer is selected from any one of methyl methacrylate-butadiene-styrene copolymer (MBS), methyl methacrylate-acrylonitrile-butadiene-styrene copolymer (MABS), and styrene-acrylonitrile-glycidyl methacrylate copolymer (SAN-GMA).

[0012] Preferably, the effect pigment is selected from any one of carbon black, titanium dioxide, and pearlescent powder.

[0013] Secondly, this application provides a method for preparing marble-textured masterbatch based on melt rheological difference control, employing the following technical solution: S1. Premixing: The pre-pulverized rheology control carrier resin, effect pigments, interface compatibilizers, and structuring processing aids are mixed in a high-speed mixer at room temperature for 5-15 minutes to obtain a uniform premix. S2. Mild melt blending and granulation: The premixed material is added to a twin-screw extruder, and the processing temperature is set to 220 ℃-260 ℃ and the screw speed is 100-350 rpm. After the material is melt-blended in the twin-screw extruder, it is extruded through a die, cooled, pelletized and dried to obtain the finished color masterbatch.

[0014] Preferably, in step S2, the processing temperature is 230-245 ℃.

[0015] Preferably, in step S2, the screw rotation speed is 150-250 rpm.

[0016] Preferably, the application of the marble-patterned masterbatch based on melt rheological difference control in the mixing and processing with the target matrix resin.

[0017] In summary, this application has the following beneficial effects: 1. This application significantly improves the processing compatibility between the imitation marble masterbatch and the target matrix resin by precisely controlling the composition and rheological properties of the carrier resin. Specifically, polymethyl methacrylate (PMMA) and styrene-acrylonitrile copolymer (SAN) are compounded in a specific ratio (4:2-3) to form a rheology control carrier resin, and the ratio of its melt flow rate (MFR carrier) to the melt flow rate (MFR matrix) of the target styrene-based polymer matrix resin is strictly controlled within the range of 2-6 (preferably 3-5). This control strategy based on melt rheological differences ensures that the viscosity of the masterbatch and the matrix resin is properly matched during the blending process. This avoids uneven dispersion or interface defects caused by excessive rheological differences, and utilizes appropriate rheological differences to produce natural and realistic marble patterns. Thus, while ensuring excellent appearance, it lays the foundation for the mechanical properties of the product.

[0018] 2. This application constructs a strong interfacial bonding layer by introducing specific interfacial compatibilizers and structuring processing aids, effectively solving the compatibility problem between effect pigments and matrix resins. The interfacial compatibilizers are selected because their molecular chain segments can be compatible with both the carrier resin and the target matrix resin, which can also entangle or react with the target matrix resin, greatly improving the dispersibility and interfacial adhesion of effect pigments in the polymer matrix. In conjunction with the use of structuring processing aids, the melt structure is further optimized, so that the stress of the final marble-patterned product can be effectively transferred and dispersed when subjected to external forces, avoiding the decline in mechanical properties caused by the weak interface between pigments and resins.

[0019] 3. The preparation method of this application optimizes the mild melt blending process, which ensures the excellent orientation and texture formation of the effect pigments while maximizing the protection of the inherent mechanical strength of the matrix material. By precisely controlling the processing temperature at 230-245℃ and setting the screw speed in the medium range of 150-250 rpm, mild but sufficient melt blending of the premix is ​​achieved. This process condition can ensure that the components are uniformly mixed and form a stable phase morphology to produce marble texture, while avoiding polymer degradation, effect pigment structure damage and loss of interfacial compatibilizer efficiency caused by overheating or excessive shear. After the final masterbatch is diluted and mixed with the matrix resin and molded, the key mechanical properties such as impact strength and tensile strength of the product can be maintained at a high level, which meets the requirements of material durability in practical applications.

[0020] 4. The color masterbatch provided in this application has broad application prospects and excellent adaptability, which can meet diverse processing application needs. The color masterbatch exhibits excellent compatibility and texture reproduction ability in various styrene-based target matrix resins such as ABS, MABS, SAN, and HIPS, with simulation scores consistently above 9.0. It also demonstrates stable mechanical properties, breaking through the limitation of traditional imitation stone materials having high selectivity for matrix resins. Furthermore, this color masterbatch system has good applicability to different types of effect pigments such as carbon black, titanium dioxide, and pearlescent powder, and the texture color and style can be flexibly adjusted according to actual application needs, providing a versatile and reliable coloring solution for imitation marble products in different application scenarios. Detailed Implementation

[0021] The present application will be further described in detail below with reference to the embodiments.

[0022] Performance testing 1. Simulation accuracy: 1-10 points, with 10 points being the best. It closely matches the texture of natural marble, without lumps, and with continuous texture. 2. Dispersibility: 1-10 points, with 10 points being optimal, indicating no pigment agglomeration and uniform distribution; 3. Impact strength: Tested according to GB / T 1043.1-2008, unit: kJ / m²; 4. Tensile strength: Tested according to GB / T 1040.2-2006, unit: MPa; 5. Processing stability: 1-10 points, with 10 points being the best. There is no melt fracture and the granulation is uniform during the extrusion process.

[0023] Examples 1-3

[0024] A marble-like color masterbatch based on melt rheological difference regulation, the raw material components and dosages are shown in Table 1 below (kg):

[0025] In the table above, the target matrix resin is ABS (MFR). 基体 =20 g / 10min, test conditions: 220 ℃, 10 kg); ABS grade PA-749SK, purchased from Shanghai Huihang New Materials Co., Ltd. The rheology control carrier resins are all blended from polymethyl methacrylate (PMMA) and styrene-acrylonitrile copolymer (SAN) in a ratio of 4:2.5; the melt flow rate (MFR) of the rheology control carrier resins is... 载体 The melt flow rate (MFR) of the target matrix resin is 5 g / 10 min. 基体 Melt Flow Rate (MFR) of Rheology Control Carrier Resin 载体 The ratio of each component was 4:1; among them, the polymethyl methacrylate (PMMA) was graded SCPMMA-150K and purchased from Shanghai Saikerui Biotechnology Co., Ltd.; the styrene-acrylonitrile copolymer (SAN) was graded BD6528 and purchased from Hubei Baidu Chemical Co., Ltd. The effect pigment was carbon black; the interface compatibilizer was methyl methacrylate-butadiene-styrene copolymer (MBS); the structuring processing aid was zinc stearate; among which, the methyl methacrylate-butadiene-styrene copolymer (MBS) was graded QF7349 and purchased from Hubei Qifei Pharmaceutical Chemical Co., Ltd.

[0026] A marble-like color masterbatch based on melt rheological difference regulation is prepared using the following steps: S1. Premixing: The pre-pulverized rheology control carrier resin, effect pigments, interface compatibilizers, structuring agents and other processing aids are mixed at room temperature for 10 min in a high-speed mixer to obtain a uniform premix. S2. Mild melt blending and granulation: The premixed material is added to a twin-screw extruder, the processing temperature is set to 235℃ and the screw speed is 200 rpm; after the material is melt-blended in the twin-screw extruder, it is extruded through a die, cooled, pelletized and dried to obtain the finished color masterbatch.

[0027] Comparative Example 1

[0028] A marble-like color masterbatch based on melt rheology difference control differs from Example 2 in that the rheology control carrier resin is composed of polymethyl methacrylate (PMMA) and styrene-acrylonitrile copolymer (SAN) in a 4:1 ratio.

[0029] Comparative Example 2

[0030] A marble-like color masterbatch based on melt rheological difference regulation differs from Example 2 in that the rheology control carrier resin is composed of polymethyl methacrylate (PMMA) and styrene-acrylonitrile copolymer (SAN) in a ratio of 4:3.5.

[0031] Test samples corresponding to Examples 1-3 and Comparative Examples 1-2 were extracted and tested according to the aforementioned performance testing methods. The simulation degree of marble texture (points), dispersion (points), tensile strength (MPa), impact strength (kJ / m²), and processing stability (points) were tested respectively. The average value of the test results was recorded in Table 2 below.

[0032]

[0033] As can be seen from Table 2, the marble-patterned masterbatches prepared in Examples 1-3 have excellent comprehensive performance, with simulation scores all above 8.2. Among them, Example 2 has the most outstanding performance, with a simulation score as high as 9.8, a tensile strength of 46.2 MPa, and an impact strength of 24.8 kJ / m², achieving the best balance between marble-patterned texture effect and mechanical properties.

[0034] Comparing the data of Example 2 with those of Comparative Examples 1-2, it can be seen that the compounding ratio of the carrier resin has a significant impact on the performance. Comparative Example 1 (PMMA:SAN=4:1) and Comparative Example 2 (PMMA:SAN=4:3.5) have simulation scores of 6.8 and 7.2 respectively because the compounding ratio exceeds the preferred range, and the tensile strength and impact strength are also reduced to varying degrees.

[0035] Cause analysis: The specific blending ratio of PMMA and SAN (4:2.5 in Example 2) can effectively adjust the rheological properties of the carrier resin, so that it can form a suitable melt rheological difference with the matrix resin ABS. When the ratio is out of balance (such as in Comparative Examples 1 and 2), the compatibility or rheological matching degree between the carrier and the matrix decreases, resulting in the pigment being unable to form a coherent and natural texture, and the interfacial bonding force weakens, thereby leading to a decrease in mechanical properties. Example 4

[0036] A marble-like masterbatch based on melt rheology differential regulation differs from Example 2 in that the rheology control carrier resin is composed of polymethyl methacrylate (PMMA) and styrene-acrylonitrile copolymer (SAN) in a 4:2 ratio. The melt flow rate (MFR) of the rheology control carrier resin was measured to be 4 g / 10 min, and the ratio of the melt flow rate (MFR) of the target matrix resin (MFR matrix, 20 g / 10 min) to the MFR carrier was 5:1. Example 5

[0037] A marble-like masterbatch based on melt rheology differential regulation differs from Example 2 in that: the rheology control carrier resin is composed of polymethyl methacrylate (PMMA) and styrene-acrylonitrile copolymer (SAN) in a 4:3 ratio; the melt flow rate (MFR) of the rheology control carrier resin was measured to be 6 g / 10 min; the ratio of the melt flow rate (MFR) of the target matrix resin (20 g / 10 min) to the MFR carrier was 3.3:1. The MFR ratios of the above embodiments 4-5 are all within the range of (2-6):1 protected by claims, and are within the preferred range of (3-5):1.

[0038] Comparative Example 3

[0039] A marble-patterned masterbatch based on melt rheology differential regulation differs from Example 1 in that the rheology control carrier resin uses polymethyl methacrylate (PMMA) alone.

[0040] Comparative Example 4

[0041] A marble-patterned masterbatch based on melt rheology differential regulation differs from Example 1 in that the rheology control carrier resin uses styrene-acrylonitrile copolymer (SAN) alone.

[0042] Test samples corresponding to Examples 4-5 and Comparative Examples 3-4 were extracted and tested according to the aforementioned performance testing methods. The simulation degree of marble texture (points), dispersion (points), tensile strength (MPa), impact strength (kJ / m²), and processing stability (points) were tested respectively. The average value of the test results was recorded in Table 3 below.

[0043]

[0044] Table 3 shows that Examples 4-5 maintained high overall performance within the PMMA to SAN blending ratio of 4:2 to 4:3, with simulation scores all above 9.4, indicating that this preferred range has good process tolerance.

[0045] As can be seen from the comparison of Comparative Examples 3 and 4, the performance deteriorates sharply when PMMA (Comparative Example 3) or SAN (Comparative Example 4) is used alone as the carrier resin. The simulation score of Comparative Example 3 is only 5.2 points, and that of Comparative Example 4 is as low as 4.8 points. The impact strength drops significantly to 13.0 kJ / m² and 12.5 kJ / m², respectively.

[0046] Cause analysis: Comparative Example 3 (pure PMMA): PMMA has relatively limited compatibility with the matrix ABS. When used alone, the interfacial bonding is weak, resulting in poor mechanical properties and insufficient ability to control rheological differences, making it difficult to form marble-like textures.

[0047] Comparative Example 4 (pure SAN): SAN has excellent compatibility with the ABS matrix, which causes the carrier resin to quickly mix with the matrix during the melting process. It cannot maintain the rheological difference interface required to form marble texture, resulting in the disappearance of texture (extremely low simulation degree) and also cannot play a reinforcing role.

[0048] Example 6

[0049] A marble-textured masterbatch based on melt rheological difference control differs from Example 2 in that the MFR of the ABS matrix resin is... 基体 To achieve a target melt flow rate (MFR) of 10 g / 10 min, different ABS resin grades with varying melt flow rates were selected as the target matrix resins to control the MFR. 基体 Melt Flow Rate (MFR) of Rheology Control Carrier Resin 载体 (Fixed to a ratio of 5 g / 10 min) makes MFR 基体 With MFR 载体 The ratios are 2:1.

[0050] Example 7

[0051] A marble-textured masterbatch based on melt rheological difference control differs from Example 2 in that the MFR of the ABS matrix resin is... 基体 To achieve a target melt flow rate (MFR) of 15 g / 10 min, different ABS resin grades with varying melt flow rates were selected as the target matrix resins to control the MFR. 基体 Melt Flow Rate (MFR) of Rheology Control Carrier Resin 载体 (Fixed to a ratio of 5 g / 10 min) makes MFR 基体 With MFR 载体 The ratio is 3:1.

[0052] Example 8

[0053] A marble-textured masterbatch based on melt rheological difference control differs from Example 2 in that the MFR of the ABS matrix resin is... 基体 To achieve a target melt flow rate of 25 g / 10 min, the melt flow rate (MFR) of the target matrix resin was adjusted by selecting ABS resin grades with different melt flow rates as the target matrix resin. 基体 Melt Flow Rate (MFR) of Rheology Control Carrier Resin 载体 (Fixed to a ratio of 5 g / 10 min) makes MFR 基体 With MFR 载体 The ratio is 5:1.

[0054] Example 9

[0055] A marble-textured masterbatch based on melt rheological difference control differs from Example 2 in that the MFR of the ABS matrix resin is... 基体 To achieve a target melt flow rate of 30 g / 10 min, the melt flow rate (MFR) of the target matrix resin was adjusted by selecting ABS resin grades with different melt flow rates as the target matrix resin. 基体 Melt Flow Rate (MFR) of Rheology Control Carrier Resin 载体 (Fixed to a ratio of 5 g / 10 min) makes MFR 基体 With MFR 载体 The ratio is 6:1.

[0056] Comparative Example 5

[0057] A marble-textured masterbatch based on melt rheological difference control differs from Example 2 in that the MFR of the selected ABS matrix resin is... 基体 The target matrix resin has a melt flow rate (MFR) of 5 g / 10 min. 基体 Melt Flow Rate (MFR) of Rheology Control Carrier Resin 载体 The ratio is 1:1.

[0058] Comparative Example 6

[0059] A marble-like color masterbatch based on melt rheological difference control differs from Example 2 in that the ABS matrix resin used has an MFR of 35 g / 10min, resulting in a higher MFR of the target matrix resin. 基体 Melt Flow Rate (MFR) of Rheology Control Carrier Resin 载体 The ratio is 7:1.

[0060] Test samples corresponding to Examples 6-9 and Comparative Examples 5-6 were extracted and tested according to the aforementioned performance testing methods. The simulation degree of marble texture (points), dispersion (points), tensile strength (MPa), impact strength (kJ / m²), and processing stability (points) were tested respectively. The average value of the test results was recorded in Table 4 below.

[0061]

[0062] As can be seen from Table 4, in Examples 6-9, when the MFR ratio is between 2 and 6, the masterbatch all exhibit good overall performance, with a simulation score between 8.0 and 9.5, indicating that a certain degree of rheological difference is necessary.

[0063] The performance of Comparative Example 5 (MFR ratio of 1) and Comparative Example 6 (MFR ratio of 7) dropped drastically. The simulation accuracy of Comparative Example 5 was only 3.2 points, and the simulation accuracy of Comparative Example 6 was only 4.5 points, with the processing stability dropping to 5.0 points.

[0064] Cause analysis: Comparative Example 5 (ratio = 1): The viscosity of the carrier and the matrix are similar, and there is a lack of melt rheological difference. During the processing, the carrier cannot form an independent rheological interface to carry the pigment to form texture, resulting in the complete failure of the marble texture effect.

[0065] Comparative Example 6 (ratio = 7): Excessive rheological differences and low carrier viscosity make it easy for melt fracture to occur during processing, resulting in disordered and discontinuous texture. At the same time, the low-viscosity carrier cannot effectively transmit shear force, leading to poor dispersibility and severely impaired mechanical properties.

[0066] Example 10

[0067] A marble-like masterbatch based on melt rheological difference control differs from Example 2 in that the matrix resin is methyl methacrylate-acrylonitrile-butadiene-styrene copolymer (MABS).

[0068] To meet the requirements for rheological difference control, the selected MABS resin has an MFR matrix of 18 g / 10 min and a ratio of 3.6:1 to the MFR carrier (5 g / 10 min); the above ratio falls within the range of (2-6):1 protected by claims.

[0069] Example 11

[0070] A marble-like masterbatch based on melt rheological difference control differs from Example 2 in that the matrix resin is styrene-acrylonitrile copolymer (SAN).

[0071] To meet the requirements for rheological difference control, the selected SAN resin has an MFR matrix of 22 g / 10 min and a ratio of 4.4:1 to the MFR carrier. The above ratio falls within the range of (2-6):1 protected by claims.

[0072] Example 12

[0073] A marble-patterned masterbatch based on melt rheological difference control differs from Example 2 in that the matrix resin is high-impact polystyrene (HIPS), wherein the high-impact polystyrene (HIPS) grade is PH-88E, purchased from Dongguan Yucheng Plastics Co., Ltd.

[0074] To meet the requirements for rheological difference control, the selected HIPS resin has an MFR matrix of 15 g / 10 min and a ratio of 3.0:1 to the MFR carrier. The above ratio falls within the range of (2-6):1 protected by claims.

[0075] Test samples corresponding to Examples 10-12 above were extracted and tested according to the aforementioned performance testing methods. The simulation degree of marble texture (points), dispersion (points), tensile strength (MPa), impact strength (kJ / m²), and processing stability (points) were tested respectively. The average value of the test results was recorded in Table 5 below.

[0076]

[0077] As can be seen from Table 5, when the color masterbatch was applied to different matrix resins such as MABS, SAN, and HIPS in Examples 10-12, the test results showed that the simulation degree was above 9.0, and the tensile strength and impact strength remained at a high level. This indicates that the color masterbatch formulation provided in this application has a wide range of matrix adaptability and can achieve excellent marble-like effects in a variety of styrene resins through the rheological difference control mechanism.

[0078] Example 13

[0079] A marble-like masterbatch based on melt rheological difference control differs from Example 2 in that: the interface compatibilizer is methyl methacrylate-acrylonitrile-butadiene-styrene copolymer (MABS); the grade of methyl methacrylate-acrylonitrile-butadiene-styrene copolymer (MABS) is 8391, purchased from North China Huajin Chemical Industry Co., Ltd.

[0080] Example 14

[0081] A marble-like masterbatch based on melt rheological difference control differs from Example 2 in that the interface compatibilizer is styrene-acrylonitrile-glycidyl methacrylate copolymer (SAN-GMA); wherein the styrene-acrylonitrile-glycidyl methacrylate copolymer (SAN-GMA) is brand name SAG002 and was purchased from Shanghai Chenke Engineering Plastics Co., Ltd.

[0082] Comparative Example 7

[0083] A marble-like color masterbatch based on melt rheological difference regulation differs from Example 2 in that it does not contain an interface compatibilizer, but is supplemented by a structured processing aid.

[0084] Samples from Examples 13-14 and Comparative Example 7 were extracted and tested according to the aforementioned performance testing method. The simulation degree of the marble texture (points), dispersion (points), tensile strength (MPa), impact strength (kJ / m²), and processing stability (points) were tested respectively. The average value of the test results was recorded in Table 6 below.

[0085]

[0086] As can be seen from Table 6, Examples 13-14 used different types of interface compatibilizers (MABS, SAN-GMA), and their performance was similar to that of Example 2, indicating that there is a certain range of compatibilizers to choose from.

[0087] Compared to Comparative Example 7 (without added interface compatibilizer), its dispersibility score plummeted to 5.5, its simulation accuracy dropped to 7.8, its impact strength was only 6.5 kJ / m², and its processing stability also deteriorated significantly.

[0088] Cause analysis: The interface compatibilizer acts as a bridge in the system, which can improve the compatibility between the carrier resin and the matrix resin and promote pigment dispersion. The lack of compatibilizer leads to increased interfacial tension between the two phases, severe pigment agglomeration, and a significant weakening of interfacial bonding. When the material is subjected to impact, interfacial peeling is likely to occur, resulting in a serious decrease in impact strength.

[0089] Example 15

[0090] A marble-patterned masterbatch based on melt rheological difference control differs from Example 2 in that the effect pigment is selected from titanium dioxide.

[0091] Example 16

[0092] A marble-like masterbatch based on melt rheological difference control differs from Example 2 in that the effect pigment is selected from pearlescent powder.

[0093] Test samples corresponding to Examples 15-16 above were extracted and tested according to the aforementioned performance testing methods. The simulation degree of marble texture (points), dispersion (points), tensile strength (MPa), impact strength (kJ / m²), and processing stability (points) were tested respectively. The average value of the test results was recorded in Table 7 below.

[0094]

[0095] As can be seen from Table 7, Examples 15-16, which used titanium dioxide and pearlescent powder respectively, both obtained high simulation scores, proving that the technical solution has good versatility for pigments with different effects.

[0096] Example 17

[0097] A marble-patterned masterbatch based on melt rheological difference control differs from Example 2 in that the processing temperature in step S2 is 220 ℃.

[0098] Example 18

[0099] A marble-patterned masterbatch based on melt rheological difference control differs from Example 2 in that the processing temperature in step S2 is 230 ℃.

[0100] Example 19

[0101] A marble-patterned masterbatch based on melt rheological difference control differs from Example 2 in that the processing temperature in step S2 is 245 ℃.

[0102] Example 20

[0103] A marble-patterned masterbatch based on melt rheological difference control differs from Example 2 in that the processing temperature in step S2 is 260 ℃.

[0104] Test samples corresponding to Examples 17-20 above were extracted and tested according to the aforementioned performance testing methods. The simulation degree of marble texture (points), dispersion (points), tensile strength (MPa), impact strength (kJ / m²), and processing stability (points) were tested respectively. The average value of the test results was recorded in Table 8 below.

[0105]

[0106] As shown in Table 8, Examples 17-20 demonstrate that processing temperature has a significant impact on performance. Example 18 (230 °C) exhibits the best performance, while Examples 17 (220 °C) and 20 (260 °C) show a decline in performance. Excessively low temperatures lead to uneven melt plasticization, while excessively high temperatures may result in partial degradation of the material or excessive viscosity variations, thus compromising texture stability.

[0107] Example 21

[0108] A marble-patterned masterbatch based on melt rheological difference control differs from Example 2 in that the screw speed in step S2 is 100 rpm.

[0109] Example 22

[0110] A marble-patterned masterbatch based on melt rheological difference control differs from Example 2 in that the screw speed in step S2 is 150 rpm.

[0111] Example 23

[0112] A marble-patterned masterbatch based on melt rheological difference control differs from Example 2 in that the screw speed in step S2 is 250 rpm.

[0113] Example 24

[0114] A marble-patterned masterbatch based on melt rheological difference control differs from Example 2 in that the screw speed in step S2 is 350 rpm.

[0115] Test samples corresponding to Examples 21-24 above were extracted and tested according to the aforementioned performance testing methods. The simulation degree of marble texture (score), dispersion (score), tensile strength (MPa), impact strength (kJ / m²), and processing stability (score) were tested respectively. The average value of the test results was recorded in Table 9 below.

[0116]

[0117] As can be seen from Table 9, Examples 21-24 show that when the screw speed is too low (100 rpm), the shear force is insufficient, resulting in uneven dispersion. When the speed is too high (350 rpm), the shear force is too strong, destroying the formed texture structure. This indicates that the appropriate speed (150-250 rpm) is the key to balancing dispersion and texture preservation.

[0118] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A marble-patterned masterbatch based on melt rheological difference regulation, characterized in that: By weight, the raw material composition includes: 40-70 parts of rheology control carrier resin; Effect pigments: 10-30 parts; Interface compatibilizer: 10-15 parts; Structured processing aid: 0.5-3 parts; The rheology control carrier resin is composed of polymethyl methacrylate and styrene-acrylonitrile copolymer in a ratio of 4:(2-3); The color masterbatch is used to mix with the target matrix resin, which is a styrene-based polymer; The ratio of the melt flow rate of the target matrix resin to the melt flow rate of the rheology control carrier resin is (2-6):

1.

2. The marble-patterned masterbatch based on melt rheological difference control according to claim 1, characterized in that: The ratio of the melt flow rate of the target matrix resin to the melt flow rate of the rheology control carrier resin is (3-5):

1.

3. The marble-patterned masterbatch based on melt rheological difference control according to claim 1, characterized in that: The styrene-based polymer is selected from any one of acrylonitrile-butadiene-styrene copolymer, methyl methacrylate-acrylonitrile-butadiene-styrene copolymer, styrene-acrylonitrile copolymer, and high-impact polystyrene.

4. The marble-patterned masterbatch based on melt rheological difference control according to claim 1, characterized in that: The interface compatibilizer is selected from any one of methyl methacrylate-butadiene-styrene copolymer, methyl methacrylate-acrylonitrile-butadiene-styrene copolymer, and styrene-acrylonitrile-glycidyl methacrylate copolymer.

5. The marble-patterned masterbatch based on melt rheological difference control according to claim 1, characterized in that: The effect pigments are selected from any one of carbon black, titanium dioxide, and pearlescent powder.

6. A method for preparing marble-like color masterbatch based on melt rheological difference control as described in any one of claims 1-5, characterized in that: Includes the following steps: S1. Premixing: Mix the pre-crushed rheology control carrier resin, effect pigments, interface compatibilizers, and structuring processing aids at room temperature for 5-15 minutes to obtain a uniform premix. S2. Mild melt blending and granulation: The premixed material is added to an extruder, and the processing temperature is set to 220 ℃-260 ℃ and the rotation speed is 100-350 rpm. After the material is melt-blended in the extruder, it is extruded through a die, cooled, granulated and dried to obtain the finished color masterbatch.

7. A method for preparing a marble-like color masterbatch based on melt rheological difference control according to claim 6, characterized in that: In step S2, the processing temperature is 230-245 ℃.

8. A method for preparing marble-like color masterbatch based on melt rheological difference control according to claim 6, characterized in that: In step S2, the screw rotation speed is 150-250 rpm.

9. The application of the marble-patterned masterbatch based on melt rheological difference control as described in any one of claims 1-5 in the mixing and processing with the target matrix resin.

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