PC / ABS alloy material as well as preparation method and application thereof

Abstract

The invention discloses a PC / ABS alloy material as well as a preparation method and application thereof. The PC / ABS alloy material is prepared from the following raw materials in parts by mass: 50-90 parts of PC resin, 10-35 parts of ABS resin, 1-7 parts of a toughening agent, 5-15 parts of a flame retardant, 5-20 parts of a talcum powder modifier and 0.1-3 parts of an aid. The talcum powder modifier comprises modified talcum powder, or a mixture of common talcum powder and an acidic lubricant, or a combination of the modified talcum powder and the acidic lubricant. The PC resin and the ABS resin are adopted as resin matrixes, and the talcum powder modifier is introduced, so that the problem that the toughness is reduced while the rigidity of the PC / ABS alloy material is improved by common talcum powder is effectively solved, and the simultaneous reinforcing and toughening effects of the material are realized; in addition, the talcum powder modifier is also beneficial to promoting the mixing dispersity of the flame retardant and a resin matrix and exerting a synergistic flame-retardant effect.

Description

Technical Field

[0001] The invention belongs to the technical field of composite materials, and in particular relates to a PC / ABS alloy material and a preparation method and application thereof. Background Art

[0002] In recent years, the automotive and home appliance industries are moving towards thin-walled and lightweight. Under this trend, polycarbonate / acrylonitrile-butadiene-styrene copolymer (PC / ABS) alloy materials have become the main materials in this field due to their wide application. However, with the continuous changes in the market, the demand for PC / ABS alloy materials from downstream customers has become increasingly diversified. For example, due to the relatively high coefficient of linear expansion (CLTE) of PC / ABS, this may lead to incompatibility with parts made of other materials during installation, and the tolerance gap of parts will also be affected in seasons with large temperature changes. In order to solve this problem, low-CLTE PC / ABS alloy materials are born. In addition, in order to meet the demand for thin-walled parts, PC / ABS alloy materials must also have higher rigidity to resist the bending deformation that may occur in thin-walled parts. Introducing mineral fillers into PC / ABS alloy materials can increase rigidity and reduce CLTE, thereby meeting the above-mentioned thin-walled and lightweight requirements well, but the introduction of mineral fillers (such as talcum powder) will also lead to new problems, such as reduced toughness.

[0003] The effect of talc on the toughness of the substrate mainly depends on its particle size and distribution, addition ratio and surface treatment. Therefore, how to reduce the toughness reduction caused by the addition of talc while ensuring the high rigidity of the talc-filled PC / ABS alloy material has become a technical challenge that technicians in this field urgently need to overcome. Summary of the invention

[0004] In order to overcome at least one of the problems existing in the above-mentioned prior art, one of the objects of the present invention is to provide a PC / ABS alloy material, which has good rigidity and toughness, as well as good flame retardant effect.

[0005] A second object of the present invention is to provide a method for preparing the PC / ABS alloy material.

[0006] A third object of the present invention is to provide an application of the PC / ABS alloy material.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] The first aspect of the present invention provides a PC / ABS alloy material, comprising the following raw materials in parts by weight: 50 to 90 parts of PC resin, 10 to 35 parts of ABS resin, 1 to 7 parts of toughening agent, 5 to 15 parts of flame retardant, 5 to 20 parts of talc modifier, and 0.1 to 3 parts of auxiliary agent; the talc modifier includes modified talc, or a mixture of ordinary talc and an acidic lubricant, or a combination of the above two.

[0009] In the present invention, modified talcum powder refers to talcum powder that has been surface-modified, for example, a coupling agent can be used to perform surface modification on talcum powder; and ordinary talcum powder refers to talcum powder that has not been surface-modified. In order to reduce the adverse effect of talcum powder on the toughness of the substrate, the main strategy is to enhance the interfacial adhesion between talcum powder and the substrate, and optimize the dispersion state of talcum powder in the substrate. Therefore, the present invention adopts modified talcum powder that has been surface-modified, which has good surface properties, good dispersibility in the resin matrix composed of PC resin and ABS resin, and good bonding strength between modified talcum powder and the resin matrix, which is conducive to improving the overall toughness of the alloy material. Since ordinary talcum powder is alkaline, direct addition may cause polycarbonate (PC) resin degradation and affect material properties. The present invention finds that adding an acidic lubricant in the preparation of raw materials can modify ordinary talcum powder on the one hand, reduce the negative effect of ordinary talcum powder on the performance of the matrix resin material, and on the other hand, the acidic lubricant can also react with ordinary talcum powder, which is conducive to improving the dispersion effect of ordinary talcum powder in the matrix resin material.

[0010] Preferably, the average particle size of the modified talc is 3 to 15 μm; more preferably 5 to 12 μm; for example, it can be any one of 5 μm, 8 μm, 10 μm, 12 μm, or a range between any two of them.

[0011] The modified talc powder obtained through modification treatment has a specific particle size, which is conducive to its better dispersion in the resin matrix, thereby achieving better material toughness.

[0012] Preferably, the silicon dioxide content of the modified talc is ≥50wt%; more preferably 50-80wt%; for example, it can be any one of 50wt%, 55wt%, 60wt%, 65wt%, 70wt%, 75wt%, 80wt% or a range value between any two of them.

[0013] The higher the silica content of the modified talc powder, the better the purity and stability of the material. The modified talc powder obtained by modification has a specific silica content, which is beneficial for the alloy material to achieve better toughness and stability.

[0014] Preferably, the diameter-to-thickness ratio of the modified talc is (20-40):1; more preferably (25-35):1; for example, it can be any one of 25:1, 28:1, 30:1, 32:1, 35:1 or a range value between any two of them.

[0015] The modified talc powder obtained by modification treatment has a specific diameter-to-thickness ratio, which is beneficial for obtaining better rigidity and toughness properties.

[0016] In some embodiments of the present invention, the modified talc powder includes TC208A, BHS-1250A or a combination thereof; in some preferred embodiments of the present invention, the modified talc powder is selected from TC208A.

[0017] TC208A and BHS-1250A are surface-modified talcum powders, which have good application effects when applied to the resin system composed of PC resin and ABS resin of the present invention. While effectively improving the rigidity of the material, the effect on the toughness is more minor, which can ensure that the material has both good rigidity and toughness.

[0018] In some embodiments of the present invention, the acidic lubricant is an acidic polymer, for example, may include ethylene acrylic acid copolymer, and the polar group carboxyl in the acidic polymer is conducive to modifying ordinary talcum powder to achieve good dispersion and toughening effects.

[0019] Preferably, the acid value of the acidic lubricant is 30-50 mgKOH / g; more preferably 35-45 mgKOH / g; for example, it can be any one of 35 mgKOH / g, 37 mgKOH / g, 40 mgKOH / g, 42 mgKOH / g, 44 mgKOH / g, 45 mgKOH / g, or a range value between any two of them.

[0020] In some embodiments of the present invention, the acidic lubricant includes AC 540A, C100 or a combination thereof; in some preferred embodiments of the present invention, the acidic lubricant is selected from C100.

[0021] AC 540A is an ethylene acrylic acid copolymer, and C100 is a hyperbranched resin containing a carboxyl group. In some specific embodiments of the present invention, the use of these two acidic lubricants can have a good modification effect on ordinary talcum powder, so that it has a good dispersion effect in the resin matrix of the present invention, which is conducive to achieving better toughness of the alloy material.

[0022] Preferably, the average particle size of the common talcum powder is 1-8 μm; more preferably 1.6-6.5 μm; for example, it can be any one of 1.6 μm, 2 μm, 2.6 μm, 3 μm, 4 μm, 5 μm, 6.5 μm or a range value between any two of them.

[0023] In some embodiments of the present invention, the mesh size of the common talcum powder is 2000-8000 mesh; for example, it can be any one of 2000 mesh (6.5 μm), 5000 (2.6 μm), 8000 mesh (1.6 μm) or a range value between any two of them.

[0024] By selecting the particle size of ordinary talcum powder, it is beneficial to better disperse it in the resin matrix, thereby achieving better material toughness.

[0025] Preferably, in the mixture of ordinary talcum powder and acidic lubricant, the mass percentage of acidic lubricant is 1-10%; more preferably 5-10%; for example, it can be any one of 5%, 6%, 7%, 8%, 9%, 10% or a range value between any two of them.

[0026] The amount of the acidic lubricant should not be too much. The present invention maintains an appropriate amount of the acidic lubricant to ensure that the PC / ABS alloy material has good mechanical properties and flame retardant properties.

[0027] Preferably, in the raw materials for preparing the PC / ABS alloy material, the mass percentage of the talc modifier is 5-12%; more preferably 6-10%; further preferably 7-8.5%; for example, it can be any one of 7%, 7.5%, 8%, 8.5% or a range value between any two of them.

[0028] Furthermore, by optimizing the dosage of the talc modifier, it is helpful to ensure that the rigidity of the alloy material is improved while having good toughness, thereby achieving better rigidity and toughness.

[0029] Preferably, the viscosity average molecular weight of the PC resin is 20000-35000 g / mol; for example, it can be any one of 20000 g / mol, 25000 g / mol, 30000 g / mol, 35000 g / mol, or a range value between any two of them.

[0030] Preferably, the melt flow rate of the PC resin at 300°C / 1.2kg is 8-12g / 10min; for example, it can be any one of 8g / 10min, 9g / 10min, 10g / 10min, 11g / 10min, 12g / 10min, or a range value between any two of them.

[0031] Preferably, the melt flow rate of the ABS resin at 220°C / 10kg is 7 to 12 g / 10min; for example, it can be any one of 7 g / 10min, 8 g / 10min, 9 g / 10min, 10 g / 10min, 11 g / 10min, 12 g / 10min, or a range value between any two of them.

[0032] Preferably, the density of the ABS resin at 23°C is 1.05-1.06 g / cm 3 ; For example, it can be 1.05g / cm 3 , 1.052g / cm 3 , 1.055g / cm 3 , 1.058g / cm 3 , 1.06g / cm 3 Any one of them or a range of values ​​between them.

[0033] In some embodiments of the present invention, the ABS resin is selected from ABS A371; more specifically, ABS A371 produced by Trinseo Polymer (Zhangjiagang) Co., Ltd.

[0034] Preferably, the toughening agent includes at least one of an MBS toughening agent, an organosilicon toughening agent or an EMA toughening agent; further preferably, the toughening agent includes an MBS toughening agent, an EMA toughening agent or a combination thereof; further preferably, the toughening agent is selected from an EMA toughening agent.

[0035] MBS refers to a terpolymer of methyl methacrylate (M), butadiene (B) and styrene (S), and EMA refers to an ethylene-methyl acrylate copolymer. MBS toughening agent, silicone toughening agent and EMA toughening agent can all play a good toughening effect on the resin matrix of the present invention, especially EMA toughening agent, which can maintain a better toughening effect in a wider temperature range by introducing a flexible segment.

[0036] Preferably, the flame retardant includes at least one of a bromine flame retardant, a silicon flame retardant or a phosphorus flame retardant. In some embodiments of the present invention, the flame retardant is selected from a phosphorus flame retardant; specifically, a phosphate flame retardant, more specifically, a PX-200 flame retardant.

[0037] Preferably, the PC / ABS alloy material comprises the following raw materials in parts by weight: 60 to 80 parts of PC resin, 12 to 25 parts of ABS resin, 3 to 5 parts of toughening agent, 7 to 13 parts of flame retardant, 8 to 15 parts of talc modifier, and 0.5 to 2 parts of auxiliary agent.

[0038] Further preferably, the PC / ABS alloy material comprises the following raw materials in parts by weight: 70 to 80 parts of PC resin, 20 to 25 parts of ABS resin, 3 to 5 parts of toughening agent, 8 to 12 parts of flame retardant, 8 to 14 parts of talc modifier, and 0.7 to 1 part of auxiliary agent.

[0039] Preferably, the auxiliary agent includes at least one of an antioxidant, an anti-drip agent or a lubricating auxiliary agent.

[0040] Preferably, the antioxidant comprises at least one of antioxidant 1010, antioxidant 1076 or antioxidant 168. In some embodiments of the present invention, the antioxidant is selected from antioxidant 1076.

[0041] Preferably, the anti-drip agent includes a polytetrafluoroethylene substance. In some embodiments of the present invention, the anti-drip agent is selected from DB105. DB105 is a modified polytetrafluoroethylene substance, which has a good anti-drip effect when used in the present invention.

[0042] Preferably, the lubricating aid comprises pentaerythritol stearate. In some embodiments of the present invention, the lubricating aid is selected from pentaerythritol stearate (PETS).

[0043] Preferably, the PC / ABS alloy material comprises the following raw materials in parts by weight: 50 to 90 parts of PC resin, 10 to 35 parts of ABS resin, 1 to 7 parts of toughening agent, 5 to 15 parts of flame retardant, 5 to 20 parts of talc modifier, 0.05 to 1.5 parts of antioxidant, and 0.05 to 1.5 parts of anti-dripping agent.

[0044] Further preferably, the PC / ABS alloy material comprises the following raw materials in parts by weight: 60 to 80 parts of PC resin, 12 to 25 parts of ABS resin, 3 to 5 parts of toughening agent, 7 to 13 parts of flame retardant, 8 to 15 parts of talc modifier, 0.1 to 0.5 parts of antioxidant, and 0.1 to 0.5 parts of anti-dripping agent.

[0045] Preferably, the PC / ABS alloy material comprises the following raw materials in parts by weight: 50 to 90 parts of PC resin, 10 to 35 parts of ABS resin, 1 to 7 parts of toughening agent, 5 to 15 parts of flame retardant, 5 to 20 parts of talc modifier, 0.05 to 0.5 parts of antioxidant, 0.05 to 0.5 parts of anti-dripping agent, and 0.1 to 2 parts of lubricating agent.

[0046] Further preferably, the PC / ABS alloy material comprises the following preparation raw materials in parts by weight: 60 to 80 parts of PC resin, 12 to 25 parts of ABS resin, 3 to 5 parts of toughening agent, 7 to 13 parts of flame retardant, 8 to 15 parts of talc modifier, 0.1 to 0.5 parts of antioxidant, 0.1 to 0.5 parts of anti-dripping agent, and 0.3 to 1.5 parts of lubricating agent.

[0047] The second aspect of the present invention provides a method for preparing the PC / ABS alloy material as described in the first aspect of the present invention, comprising the following steps: mixing, melt-extruding and granulating the raw materials in sequence to obtain the PC / ABS alloy material.

[0048] Preferably, the melt extrusion temperature is 200-270°C, more preferably 220-250°C, for example, it can be any one of 220°C, 230°C, 240°C, 250°C or a range between any two of them.

[0049] Preferably, the melt extrusion is carried out by twin-screw extrusion.

[0050] Preferably, the diameter of the screw used in the twin-screw extrusion is 30-40 mm; for example, it can be any one of 30 mm, 35 mm, 40 mm, or a range of values ​​between any two of them.

[0051] Preferably, the aspect ratio (L / D) of the screw used in the twin-screw extrusion is 30 to 40; for example, it can be any one of 30, 36, 40 or a range value between any two of them.

[0052] Preferably, the screw speed of the twin-screw extruder during feeding is 20 to 30 r / min; for example, it can be any one of 20 r / min, 25 r / min, 30 r / min, or a range value between any two of them.

[0053] Preferably, the screw speed of the twin-screw extruder during extrusion is 250-350 r / min; for example, it can be any one of 250 r / min, 300 r / min, 350 r / min, or a range value between any two of them.

[0054] The third aspect of the present invention provides a use of the PC / ABS alloy material as described in the first aspect of the present invention in the preparation of lightweight products or thin-walled products.

[0055] Preferably, the lightweight products include lightweight cars or lightweight home appliances; the thin-walled products include thin-walled cars or thin-walled home appliances.

[0056] The beneficial effects of the present invention are as follows: the present invention adopts PC resin and ABS resin as resin matrix, and introduces talcum powder modifier, which effectively solves the problem that ordinary talcum powder decreases toughness while improving the rigidity of PC / ABS alloy material, and realizes the simultaneous strengthening and toughening effect of the material; and the added toughening agent is conducive to further improving the toughness of the material; in addition, the talcum powder modifier of the present invention is also conducive to promoting the mixed dispersibility of the flame retardant and the resin matrix, and exerts a synergistic flame retardant effect, so that the material can pass the 1.5mm UL94 V0 test. The PC / ABS alloy material provided by the present invention has good rigidity, toughness and flame retardant effect, which is conducive to the preparation of lightweight products or thin-walled products.

[0057] Specifically, compared with the prior art, the present invention has the following advantages:

[0058] 1. The present invention can effectively improve the toughness of the material by combining the talcum powder modifier and the toughening agent, while maintaining good rigidity and having both rigidity and toughness; and by combining the talcum powder modifier and the flame retardant, they can synergistically exert a flame retardant effect and achieve high flame retardant performance.

[0059] 2. The flame retardant used in the present invention is a halogen-free flame retardant, which significantly reduces the emission of toxic smoke and corrosive gases generated during the combustion of the material, enhances the flame retardant effect of the material, and meets environmental protection standards, ensuring the safety and reliability of the material use.

[0060] 3. The PC / ABS alloy material provided by the present invention has good mechanical properties such as tensile strength, flexural strength, elastic modulus, notched impact strength, etc., and the preparation method is simple, which is conducive to large-scale production. DETAILED DESCRIPTION

[0061] The content of the present invention is further described in detail below through specific examples. It should also be understood that the following examples are only used to further illustrate the present invention and cannot be construed as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made by those skilled in the art based on the principles set forth in the present invention all belong to the scope of protection of the present invention. The specific process parameters and the like in the following examples are also only examples within a suitable range, that is, those skilled in the art can make a selection within a suitable range through the description herein, and are not limited to the specific data exemplified below. The raw materials, reagents or devices used in the following examples and comparative examples, unless otherwise specified, can all be obtained from conventional commercial sources, or can be obtained by existing known methods.

[0062] In the following examples and comparative examples, the specific information of some raw materials used is as follows:

[0063] PC resin: The viscosity average molecular weight is 25000-30000 g / mol, and the melt flow rate (MFR) at 300°C / 1.2 kg is 9-10 g / 10 min.

[0064] ABS resin: ABS A371 purchased from Trinseo Polymer (Zhangjiagang) Co., Ltd.; melt flow rate (MFR) at 220°C / 10kg is 8.5 g / 10min; density at 23°C is 1.05 g / cm 3 .

[0065] Modified talcum powder: TC208A and BHS-1250A both have a complete flaky structure, wherein TC208A was purchased from Pansu Technology (Shanghai) Co., Ltd.; BHS-1250A was purchased from Quanzhou Xufeng Powder Raw Material Co., Ltd., with an aspect ratio of 30:1, a silicon dioxide content of ≥60%, and an average particle size of 6.5-7.0 μm.

[0066] Acidic lubricants: AC 540A is an ethylene acrylic acid copolymer purchased from Honeywell; C100 is a hyperbranched resin containing carboxyl groups purchased from Wuhan Hyperbranched Resin Technology Co., Ltd.

[0067] Example 1

[0068] A PC / ABS alloy material, prepared from the following raw materials:

[0069] PC resin 74 mass parts, ABS resin 25 mass parts, PX-200 flame retardant 10 mass parts, MBS toughening agent 4 mass parts, modified talc TC208A 12 mass parts, 1076 antioxidant 0.2 mass parts, 168 antioxidant 0.2 mass parts, anti-dripping agent DB105 0.3 mass parts, lubricating agent PETS 0.3 mass parts.

[0070] The specific preparation method of the above PC / ABS alloy material is as follows:

[0071] The PC resin and ABS resin are dried in a blast drying oven at 90-100°C for 2-4 hours to remove moisture; the preheated PC resin, ABS resin and other raw materials such as flame retardants, toughening agents, modified talcum powder are added to a high-speed mixer in proportion and mixed evenly; the evenly mixed raw materials are placed in the main feeding bin of the twin-screw extruder, and are fed into the main barrel of the extruder through the feeding screw for melt extrusion. The specific parameters are as follows: the screw diameter of the twin-screw extruder is 35mm, the aspect ratio L / D=36, the speed of the feeding screw is set to 25r / min, the extrusion temperature is controlled within the range of 220-250°C, and the speed of the twin screw is 300 rpm. The extruded material strips are cooled in a water tank and then pelletized to finally obtain the PC / ABS alloy material.

[0072] Example 2

[0073] A PC / ABS alloy material, prepared from the following raw materials:

[0074] PC resin 76 mass parts, ABS resin 25 mass parts, PX-200 flame retardant 10 mass parts, MBS toughening agent 4 mass parts, modified talc TC208A 10 mass parts, 1076 antioxidant 0.2 mass parts, 168 antioxidant 0.2 mass parts, anti-dripping agent DB105 0.3 mass parts, lubricating agent PETS 0.3 mass parts.

[0075] The preparation method is the same as that of Example 1.

[0076] Example 3

[0077] A PC / ABS alloy material, prepared from the following raw materials:

[0078] 78 parts by mass of PC resin, 25 parts by mass of ABS resin, 10 parts by mass of PX-200 flame retardant, 4 parts by mass of MBS toughening agent, 8 parts by mass of modified talc powder TC208A, 0.2 parts by mass of 1076 antioxidant, 0.2 parts by mass of 168 antioxidant, 0.3 parts by mass of anti-dripping agent DB105, and 0.3 parts by mass of lubricating agent PETS.

[0079] The preparation method is the same as that of Example 1.

[0080] Example 4

[0081] A PC / ABS alloy material, prepared from the following raw materials:

[0082] PC resin 74 mass parts, ABS resin 25 mass parts, PX-200 flame retardant 10 mass parts, MBS toughening agent 4 mass parts, ordinary talcum powder 5000 mesh 12 mass parts, 1076 antioxidant 0.2 mass parts, 168 antioxidant 0.2 mass parts, anti-dripping agent DB105 0.4 mass parts, acidic lubricant AC 540A 1.2 mass parts.

[0083] The preparation method is the same as that of Example 1.

[0084] Example 5

[0085] A PC / ABS alloy material, prepared from the following raw materials:

[0086] PC resin 74 mass parts, ABS resin 25 mass parts, PX-200 flame retardant 10 mass parts, MBS toughening agent 4 mass parts, ordinary talcum powder 5000 mesh 12 mass parts, 1076 antioxidant 0.2 mass parts, 168 antioxidant 0.2 mass parts, anti-dripping agent DB105 0.4 mass parts, acid lubricant C100 1.2 mass parts.

[0087] The preparation method is the same as that of Example 1.

[0088] Example 6

[0089] A PC / ABS alloy material, the difference between the raw materials and those in Example 1 is that the modified talc powder TC208A is replaced with modified talc powder BHS-1250A. The rest of the raw materials and the preparation method are the same as those in Example 1.

[0090] Example 7

[0091] A PC / ABS alloy material, the difference between the raw materials used in the preparation of the material and the material used in Example 1 is that the toughening agent MBS is replaced by the toughening agent EMA. The remaining raw materials and the preparation method are the same as those in Example 1.

[0092] Comparative Example 1

[0093] A PC / ABS alloy material, the difference between the raw materials and those in Example 1 is that the modified talc powder TC208A is replaced with ordinary talc powder 5000 mesh. The rest of the raw materials and the preparation method are the same as those in Example 1.

[0094] Comparative Example 2

[0095] A PC / ABS alloy material, the difference between the raw materials used in the preparation and those in Example 4 is that the mass fraction of the acidic lubricant AC 540A is increased to 1.5 mass fractions, and the mass fraction of the PC resin is reduced to 73.7 mass fractions. The remaining raw materials and preparation method are the same as those in Example 4.

[0096] Comparative Example 3

[0097] A PC / ABS alloy material, the difference between the raw materials and Example 5 is that the mass fraction of the acidic lubricant C100 is increased to 1.5 mass fractions, and the mass fraction of the PC resin is reduced to 73.7 mass fractions. The rest of the raw materials and the preparation method are the same as Example 5.

[0098] Comparative Example 4

[0099] A PC / ABS alloy material, the difference between the raw materials and Example 1 is that the mass fraction of modified talcum powder is reduced to 0 mass fraction, and the mass fraction of PC resin is increased to 86 mass fractions. The rest of the raw materials and the preparation method are the same as Example 1.

[0100] Performance Testing

[0101] The products obtained from the above Examples 1 to 7 and Comparative Examples 1 to 4 were subjected to relevant performance tests, the tensile strength test was tested according to the ASTM D638-2022 standard; the flexural strength test was tested according to the ASTM D790-2017 standard; the notched impact strength test was tested according to the ASTM D256-2023 standard; and the flame retardant performance test was tested according to the UL 94-2023 standard. The test results are shown in Table 1.

[0102] Table 1 Performance test results of Examples 1 to 7 and Comparative Examples 1 to 4

[0103]

[0104] As can be seen from Table 1, by comparing Examples 1 to 3, it can be observed that when the amount of modified talc TC208A added gradually increases, the rigidity of the PC / ABS alloy material is improved, but its toughness decreases accordingly. The reason for this phenomenon is mainly attributed to the fact that with the increase in the amount of talc added, it may form more brittle interfaces in the alloy, and these interfaces are easy to become the starting point of cracks and expand when subjected to external forces, resulting in a decrease in the toughness of the alloy.

[0105] Ordinary talcum powder is mainly composed of hydrated magnesium silicate, and its alkaline properties may have an adverse effect on polycarbonate (PC). In order to solve this problem, Examples 4 to 5 deliberately added an acidic lubricant while using ordinary talcum powder. During the blending stage, the acidic lubricant modified the talcum powder to reduce the negative effects of talcum powder on the performance of the base material. Specifically, the acidic lubricant can neutralize the alkalinity of talcum powder, thereby preventing PC from degrading. In addition, the reaction of this acidic lubricant with talcum powder is also beneficial to improve the dispersion effect of talcum powder in the substrate.

[0106] By comparing Example 1 with Examples 4 to 6, it can be seen that, compared with the talc powder modified by the acidic lubricant, the talc powder TC208A and BHS-1250A obtained by surface modification technology have a lesser effect on the toughness of the PC / ABS alloy material, and can obtain better rigidity and toughness performance.

[0107] By comparing Example 4 with Example 5, it can be seen that the PC / ABS alloy material with the addition of acidic lubricant C100 has higher toughness than that with the addition of acidic lubricant AC 540A. This may be because C100 allows ordinary talcum powder to be better dispersed in the PC / ABS alloy material, thereby significantly reducing the adverse effect of talcum powder on the toughness of PC / ABS.

[0108] By comparing Example 1 with Example 6 and Comparative Example 1, it can be seen that among the three talc powders, the addition of modified talc powder TC208A and talc powder BHS-1250A can make the PC / ABS alloy material have high rigidity, excellent flame retardancy and high toughness. It is particularly worth mentioning that the addition of modified talc powder TC208A has the least effect on the toughness of the PC / ABS alloy material, and can make the alloy material have better toughness.

[0109] By comparing Example 1 with Example 7, it can be seen that the toughening agent EMA has a more obvious effect on enhancing the toughness of the PC / ABS alloy material than the toughening agent MBS. This may be because EMA can maintain a better toughening effect in a wider temperature range by introducing a flexible segment.

[0110] By comparing Example 1 and Comparative Example 1, it can be seen that compared with the same amount of ordinary talcum powder, the notched impact strength of the PC / ABS alloy material obtained by using the modified talcum powder TC208A is significantly improved, and the notched impact strength of Example 1 is 77% higher than that of Comparative Example 1.

[0111] By comparing Examples 4 to 5 with Comparative Examples 2 to 3, it can be seen that the amount of the acidic lubricant should not be too much, otherwise it will have an adverse effect on the performance and flame retardancy of the PC / ABS alloy material.

[0112] By comparing Example 1 with Comparative Examples 1 and 4, it can be seen that adding talcum powder, whether ordinary talcum powder or modified talcum powder, to the PC / ABS alloy material can effectively improve the flame retardant properties of the material.

[0113] From the above analysis, it can be seen that the combination of talcum powder modifier and toughening agent in the embodiment of the present invention can effectively improve the toughness of the material, while maintaining good rigidity and having both rigidity and toughness; and the combination of talcum powder modifier and flame retardant can synergistically exert flame retardant effect and achieve high flame retardant performance. In addition, the flame retardant used in the embodiment of the present invention is a halogen-free flame retardant, which significantly reduces the emission of toxic smoke and corrosive gases generated during the combustion of the material, enhances the flame retardant effect of the material, and meets environmental protection standards to ensure the safety and reliability of the use of the material. The PC / ABS alloy material provided in the embodiment of the present invention has good mechanical properties such as tensile strength, flexural strength, elastic modulus, notched impact strength, and the preparation method is simple, which is conducive to large-scale production.

[0114] In summary, the present invention uses PC resin and ABS resin as resin matrices, and introduces talcum powder modifier, which effectively solves the problem that ordinary talcum powder decreases toughness while improving the rigidity of PC / ABS alloy materials, and realizes the simultaneous strengthening and toughening effect of the materials; and the added toughening agent is conducive to further improving the toughness of the materials; in addition, the talcum powder modifier of the present invention is also conducive to promoting the mixed dispersibility of the flame retardant and the substrate, and exerting a synergistic flame retardant effect, so that the material can pass the 1.5mm UL94 V0 test. The PC / ABS alloy material provided by the present invention has good rigidity, toughness and flame retardant effect, which is conducive to the preparation of high-performance, especially lightweight or thin-walled automobiles or household appliances.

Claims

1. A PC / ABS alloy material, characterized in that: The invention comprises the following raw materials in parts by weight: 50 to 90 parts of PC resin, 10 to 35 parts of ABS resin, 1 to 7 parts of toughening agent, 5 to 15 parts of flame retardant, 5 to 20 parts of talc modifier and 0.1 to 3 parts of auxiliary agent; the talc modifier comprises modified talc, or a mixture of ordinary talc and acidic lubricant, or a combination of the above two.

2. The PC / ABS alloy material according to claim 1, characterized in that: The average particle size of the modified talc is 3 to 15 μm; and / or, the silicon dioxide content of the modified talc is ≥50wt%; And / or, the diameter-to-thickness ratio of the modified talc is (20-40):1; and / or, the acid value of the acidic lubricant is 30 to 50 mgKOH / g; And / or, the average particle size of the common talcum powder is 1 to 8 μm.

3. The PC / ABS alloy material according to claim 1, characterized in that: The modified talc powder includes TC208A, BHS-1250A or a combination thereof; And / or, the acidic lubricant includes AC 540A, C100 or a combination thereof.

4. The PC / ABS alloy material according to claim 1, characterized in that: In the mixture of ordinary talcum powder and acidic lubricant, the mass percentage of the acidic lubricant is 1 to 10%; And / or, in the raw materials for preparing the PC / ABS alloy material, the mass percentage of talc modifier is 5-12%.

5. The PC / ABS alloy material according to claim 1, characterized in that: The viscosity average molecular weight of the PC resin is 20000-35000 g / mol; and / or, the PC resin has a melt flow rate of 8 to 12 g / 10 min at 300° C. / 1.2 kg; and / or, the melt flow rate of the ABS resin at 220° C. / 10 kg is 7 to 12 g / 10 min; And / or, the density of the ABS resin at 23°C is 1.05-1.06 g / cm 3 ; And / or, the toughening agent includes at least one of an MBS toughening agent, an organosilicon toughening agent or an EMA toughening agent; And / or, the flame retardant includes at least one of a bromine-based flame retardant, a silicon-based flame retardant or a phosphorus-based flame retardant.

6. The PC / ABS alloy material according to claim 1, characterized in that: The auxiliary agent includes at least one of an antioxidant, an anti-drip agent or a lubricating auxiliary agent.

7. The PC / ABS alloy material according to claim 6, characterized in that: The antioxidant includes at least one of antioxidant 1010, antioxidant 1076 or antioxidant 168; And / or, the anti-dripping agent includes polytetrafluoroethylene-based substances; And / or, the lubricating aid includes pentaerythritol stearate.

8. A method for preparing a PC / ABS alloy material as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: The prepared raw materials are sequentially mixed, melt-extruded and granulated to obtain the PC / ABS alloy material.

9. The preparation method according to claim 8, characterized in that: The temperature of the melt extrusion is 200-270°C.

10. Use of the PC / ABS alloy material according to any one of claims 1 to 7 in preparing lightweight products or thin-walled products.

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