PC / ABS (polycarbonate / acrylonitrile-butadiene-styrene) composite material, coated product and preparation method and application of PC / ABS composite material

Abstract

The invention relates to a PC / ABS composite material, a coated product and a preparation method and application of the PC / ABS composite material, and belongs to the technical field of engineering plastics. The PC / ABS composite material disclosed by the invention is prepared from the following components in parts by weight: 43 to 82 parts of PC resin, 16 to 57 parts of ABS resin and 0.8 to 5.2 parts of SAN (Styrene Acrylonitrile Butadiene Styrene) resin, the degree of crosslinking of the SAN resin is 50%-80%. According to the invention, by adding the cross-linked SAN resin, the compatibility of ABS and PC in the PC / ABS composite material is reduced, and the surface roughness is increased, so that the specific surface area when a base material is bonded with glue is increased, the intermolecular interaction is increased, and the stripping force is improved, and MBS resin can be further added to improve the mechanical properties of the material. Therefore, the PC / ABS composite material has high toughness, high stripping force and heat-resistant bonding stability, and can be widely applied to automotive interior cladding parts.

Description

Technical Field

[0001] The present invention belongs to the technical field of engineering plastics, and particularly relates to a PC / ABS composite material, a coated product, and a preparation method and application of the PC / ABS composite material. Background Art

[0002] The PC / ABS alloy combines the excellent properties of polycarbonate (PC) and acrylonitrile-butadiene-styrene terpolymer (ABS) (the formability, chemical stability of the ABS material, and the mechanical properties, impact strength, and heat resistance of PC, etc.), and is a polymer alloy with excellent comprehensive properties. Adding ABS can reduce the cost and melt viscosity of PC, improve fluidity, enhance its processing performance, reduce internal stress in products, and maintain its excellent properties. The PC / ABS alloy has superior comprehensive properties, with the advantages of high strength, good toughness, and high heat resistance, and is widely used in automotive products.

[0003] With the development of new energy vehicles, automotive interiors are gradually developing towards comfort and good appearance. Coating plastic interior parts is a common means. Since the interior of the vehicle is a closed environment and the vehicle is exposed to sunlight for a long time, the interior temperature can reach 90°C. Therefore, the coated parts inside the vehicle must have a high peel strength even at high temperatures to prevent the substrate from detaching from the coated surface. However, when the PC / ABS resin alloy is used for coating complex parts, the bonding strength is poor, resulting in easy debonding at complex positions such as large curved surfaces during high-temperature heat storage. This obvious defect greatly limits the further expansion of the application of this product. Especially in automotive interiors, the product has very high requirements for the peel strength retention rate under long-term heat storage conditions.

[0004] Therefore, it is of great significance to improve the peel strength of the PC / ABS composite material. Summary of the Invention

[0005] The purpose of the present invention is to overcome the problems existing in the above-mentioned prior art, and provide a PC / ABS composite material, a coated product, and a preparation method and application of the PC / ABS composite material.

[0006] The present invention is realized through the following technical solutions:

[0007] In the first aspect, the present invention provides a PC / ABS composite material, which comprises the following components in parts by weight: 43-82 parts of PC resin, 16-57 parts of ABS resin, and 0.8-5.2 parts of SAN resin; the crosslinking degree of the SAN resin is 50%-80%.

[0008] In the PC / ABS composite material of the present invention, by adding crosslinked SAN, the compatibility between ABS and PC is reduced, forming a microscopic undulating topography on the surface, increasing the surface roughness, thereby increasing the wetting area between the substrate and the glue, increasing the intermolecular interaction, increasing the adhesion of the coated parts, and improving the peel strength.

[0009] Preferably, the PC / ABS composite material further comprises 0.6 - 5.4 parts of MBS resin.

[0010] In the PC / ABS composite material of the present invention, a core-shell structured MBS resin can be further added. Its large particle size butadiene rubber can significantly improve the impact resistance of the material, and finally obtain a PC / ABS composite material with high thermal peel strength and excellent impact resistance.

[0011] In the PC / ABS composite material of the present invention, the weight fraction of PC resin is any one or the range value of two of 43 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts, 80 parts, 82 parts; the weight fraction of ABS resin is any one or the range value of two of 16 parts, 18 parts, 20 parts, 24 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 57 parts.

[0012] In the PC / ABS composite material of the present invention, the crosslinking degree of SAN resin is any one or the range value of two of 50%, 55%, 60%, 65%, 70%, 75%, 80%.

[0013] Preferably, the PC / ABS composite material, by weight, comprises the following components: 45 - 80 parts of PC resin, 18 - 55 parts of ABS resin, 1 - 5 parts of SAN resin, 1 - 5 parts of MBS resin; the crosslinking degree of the SAN resin is 50% - 80%.

[0014] Specifically, the crosslinking degree test method of the SAN resin is the swelling equilibrium method, and the test solvent is acetone.

[0015] Preferably, in the PC / ABS composite material, the mass percentage content of the PC resin is not less than 40%.

[0016] In the PC / ABS composite material of the present invention, the PC resin is bisphenol A polycarbonate.

[0017] Preferably, the mass ratio of the SAN resin to the MBS resin is (0.6 - 1):1.

[0018] More preferably, the mass ratio of the SAN resin to the MBS resin is (0.6 - 0.8):1.

[0019] The ratio between SAN resin and MBS resin can affect the peel strength and mechanical properties of the composite material. The research of the present invention finds that when the SAN resin and MBS resin are in the above-mentioned ratio, the material can have excellent comprehensive properties.

[0020] Preferably, the glass transition temperature of the SAN resin is 102°C - 108°C.

[0021] Specifically, the test method for the glass transition temperature refers to the standard GB / T 19466.2 - 2004.

[0022] The glass transition temperature of the SAN resin can, to a certain extent, reflect the molecular weight and crosslinking degree of the material. Selecting a SAN resin with a glass transition temperature of 102°C - 108°C can improve the heat-resistant peel performance of the material.

[0023] Preferably, the melt flow rate of the PC resin at 300°C and a load of 1.2 kg according to ISO1133 - 2011 is 10 - 30 g / 10 min.

[0024] Preferably, the melt flow rate of the ABS resin at 220°C and a load of 10 kg according to ISO1133 - 2011 is 5 - 18 g / 10 min.

[0025] The MBS resin is a ternary core-shell structure copolymer with butadiene as the core and methyl methacrylate and styrene as the shell. Preferably, the melt flow rate of the MBS resin at 220°C and a load of 10 kg according to ISO1133 - 2011 is 3 - 10 g / 10 min.

[0026] In the second aspect, the present invention provides a method for preparing the PC / ABS composite material, including the following steps: mixing the components evenly according to the weight parts, melting and extruding through a twin-screw extruder, and pelletizing to obtain the PC / ABS composite material.

[0027] The preparation method of the present invention is simple and can achieve industrial-scale production.

[0028] Preferably, the temperature of the melt extrusion is 250°C - 280°C.

[0029] In the third aspect, the present invention provides the application of the PC / ABS composite material in automotive interiors.

[0030] The PC / ABS composite material of the present invention has high toughness, high peel strength, and heat-resistant bonding stability, and can effectively improve the bonding effect when applied to automotive interior trim parts.

[0031] Fourth aspect, the present invention provides a coated product, comprising a workpiece to be coated, wherein the outer surface of the workpiece is adhesively bonded with a coating layer through glue, and the workpiece comprises the PC / ABS composite material.

[0032] Specifically, the workpiece is prepared by using the PC / ABS composite material.

[0033] The present invention has the following beneficial effects:

[0034] By adding crosslinked SAN resin, the present invention reduces the compatibility between ABS and PC in the PC / ABS composite material and increases the surface roughness, thereby increasing the specific surface area during the adhesion of the substrate and the glue, increasing the intermolecular interaction, and improving the peel strength. Further adding MBS resin improves the mechanical properties of the material, making the PC / ABS composite material have high toughness, high peel strength, and heat-resistant adhesion stability, and can be widely applied to automotive interior trim parts. Specific embodiments

[0035] To better illustrate the purpose, technical solution, and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments. Those skilled in the art should understand that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0036] Unless otherwise specified, the test methods used in the examples are all conventional methods; the materials, reagents, etc. used, unless otherwise specified, can all be obtained from commercial channels.

[0037] Examples 1-10

[0038] The composition components of the PC / ABS composite material described in the examples of the present invention are shown in Table 1.

[0039] The preparation method of the PC / ABS composite material includes the following steps: mixing the components evenly according to the weight parts, melting and extruding through a twin-screw extruder at 270 °C, and pelletizing to obtain the PC / ABS composite material.

[0040] Comparative Examples 1-4

[0041] The differences between Comparative Examples 1-4 and the examples are only in the types and ratios of the components, as shown in Table 2.

[0042] Among the components of each example and comparative example,

[0043] The PC resin-1 is: LG Chem., PC 1300 10NP, melt flow rate of 10 g / 10 min;

[0044] The PC resin-2 is: Mitsubishi Chemical Corporation, Japan, PC H-3000, melt flow rate of 30 g / 10 min;

[0045] The ABS resin - 1 is: ABS 745, Kumho Petrochemical Co., Ltd., melt flow rate is 10 g / min;

[0046] The ABS resin - 2 is: ABS 3504, Shanghai Gaqiao Petrochemical Co., Ltd., melt flow rate is 5 g / min;

[0047] The ABS resin - 3 is: ABS PA - 757K, Chi Mei Chemical Industry Co., Ltd. of Taiwan Province, China, melt flow rate is 18 g / min;

[0048] The SAN resin - 1 is: Sabic, INPBMAT - 1000, cross - linking degree is 60%, glass transition temperature is 108 °C;

[0049] The SAN resin - 2 is: Hannano of Korea, AM - 08, cross - linking degree is 50%, glass transition temperature is 107 °C;

[0050] The SAN resin - 3 is: Shandong Dingding Chemical Co., Ltd., DXG05, cross - linking degree is 70%, glass transition temperature is 107 °C;

[0051] The SAN resin - 4 is: Kumho Petrochemical, SAN 320NA, cross - linking degree is 0%, glass transition temperature is 100 °C;

[0052] The SAN resin - 5 is: Kibitron, XGM - 001, cross - linking degree is 40%, glass transition temperature is 103 °C;

[0053] The SAN resin - 6 is: Shanghai Dingyuan Chemical Industry Co., Ltd., matting agent INPBMAT, cross - linking degree is 90%, glass transition temperature is 108 °C;

[0054] The MBS resin is: EM500, LG Chem of Korea, melt flow rate is 5 g / 10 min;

[0055] Unless otherwise specified, the component raw materials used in each example and comparative example of the present invention are all commercially available raw materials, and the component raw materials used in each parallel experiment are the same kind.

[0056] Table 1 Component contents (parts) of materials in Examples 1 - 10

[0057]

[0058] Table 2 Component contents (parts) of materials in Comparative Examples 1 - 4

[0059] Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 PC Resin - 1 70 70 70 70 ABS Resin - 1 24 24 24 24 SAN Resin - 4 3 SAN Resin - 5 3 SAN Resin - 6 3 MBS Resin 5 5 5 5

[0060] The PC / ABS composite materials prepared in each example and comparative example were subjected to the following property tests, specifically as follows:

[0061] 1. Initial peel strength test method:

[0062] Add the PC / ABS composite material particles into an injection molding machine, melt them at a temperature of 260 °C, and injection mold them into 130*13*2 mm specimens. Heat bond the specimens to the carpet surface coated with glue, and leave the bonded specimens at room temperature for 4 days to cure. Then, conduct a peel strength test on the bonded specimens according to the GB / T 2792-2014 standard.

[0063] 2. Peel strength test method after heat storage:

[0064] Place the bonded specimens in an environmental chamber at 85 °C for 500 h, take them out, and conduct a peel strength test according to the GB / T 2792-2014 standard.

[0065] 3. Notched Izod impact strength test method:

[0066] Add the PC / ABS composite material particles into an injection molding machine, melt them at a temperature of 260 °C, and injection mold them into 80*10*4 mm specimens. After adjusting at room temperature for 24 h, conduct a notched Izod impact strength test according to the GB / T 1043.1-2018 standard.

[0067] The test results are shown in Tables 3 and 4.

[0068] Table 3 Material property test results of Examples 1-10

[0069]

[0070] Table 4 Material property test results of Comparative Examples 1-4

[0071]

[0072] From the test results in Tables 3-4, it can be seen that the PC / ABS composite material of the present invention has excellent thermal peel strength, and the peel strength after heat storage is not less than 2500 N / m. Further adding MBS will enable the material to have an impact strength of not less than 45 kJ / m while the peel strength is not less than 2500 N / m 2 so as to obtain a PC / ABS composite material with high thermal peel strength and good impact resistance.

[0073] It can be seen from Comparative Example 1 that without adding SAN resin, the peel strength before and after heat storage will be significantly reduced. In Comparative Example 2, using uncrosslinked SAN resin will not result in a significant increase in the peel strength. In Comparative Example 3, the crosslinking degree of the SAN resin is too low, and the peel strength decreases. In Comparative Example 4, the crosslinking degree of the SAN resin is too high, and the peel strength also decreases.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A PC / ABS composite material, characterized in that, By weight parts, it comprises the following components: 43 - 82 parts of PC resin, 16 - 57 parts of ABS resin, 0.8 - 5.2 parts of SAN resin; the crosslinking degree of the SAN resin is 50% - 80%.

2. The PC / ABS composite material according to claim 1, wherein, The PC / ABS composite material further comprises 0.6 - 5.4 parts of MBS resin.

3. The PC / ABS composite material according to claim 2, wherein The mass ratio of the SAN resin to the MBS resin is (0.6 - 1):

1.

4. The PC / ABS composite material according to claim 1, characterized in that, The glass transition temperature of the SAN resin is 102°C - 108°C.

5. The PC / ABS composite material according to claim 1, wherein, The melt flow rate of the PC resin at 300°C and a load of 1.2 kg according to ISO1133 - 2011 is 10 - 30 g / 10 min.

6. The PC / ABS composite material according to claim 1, characterized in that, The melt flow rate of the ABS resin at 220°C and a load of 10 kg according to ISO1133 - 2011 is 5 - 18 g / 10 min.

7. The PC / ABS composite material according to claim 2, characterized in that, The melt flow rate of the MBS resin at 220°C and a load of 10 kg according to ISO1133 - 2011 is 3 - 10 g / 10 min.

8. The preparation method of the PC / ABS composite material according to any one of claims 1-7, characterized in that, It comprises the following steps: Mix the components evenly according to the said weight parts, melt - extrude through a twin - screw extruder, and pelletize to obtain the PC / ABS composite material.

9. The application of the PC / ABS composite material according to any one of claims 1 - 7 in automotive interiors.

10. A coated article, comprising a workpiece to be coated, wherein a coating layer is adhesively bonded to the outer surface of the workpiece, characterized in that, The part comprises the PC / ABS composite material according to any one of claims 1 - 7.

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