Plastic for precise parts of electronic products and preparation method of plastic

Abstract

The invention particularly relates to plastic for an electronic product precision part and a preparation method of the plastic. The composite plastic is prepared from the following raw materials in parts by weight: 60 to 70 parts of PC, 30 to 40 parts of ABS, 15 to 25 parts of glass fiber, 15 to 20 parts of filler, 5 to 10 parts of MBS, 2 to 8 parts of compatilizer, 1 to 5 parts of coupling agent, 1 to 3 parts of antioxidant, 1 to 3 parts of lubricant and 6 to 12 parts of functional additive. According to the plastic for the electronic product precision part, the PC, the ABS, the MBS, the glass fiber and the filler are compounded and have a synergistic effect with the compatilizer, the functional auxiliary agent, the coupling agent and other raw materials, so that the prepared plastic for the electronic product precision part has good mechanical properties, water resistance, heat resistance and dimensional stability, can be suitable for preparing 3C consumer electronic product precision parts, and has wide application prospects. The preparation method of the plastic for the electronic product precision part is simple in process, convenient to operate, high in production efficiency and beneficial to industrial production.

Description

Technical Field

[0001] The present invention relates to the technical field of plastics, and in particular to plastic for precision parts of electronic products and a preparation method thereof. Background Art

[0002] With the advancement of technology and the improvement of people's living standards, 3C consumer electronics such as smartphones, laptops, and smart wearable devices have become widely used in people's lives and work. Currently, existing 3C consumer electronics are trending towards functionality, miniaturization, and lightweight design. This places higher demands on the comprehensive performance of plastic materials used in precision electronic components. Plastic materials used in precision electronic components must possess excellent mechanical properties to withstand assembly stress, drop impact, and other factors. They must also meet excellent heat resistance, water resistance, flame retardancy, and dimensional stability to adapt to complex operating environments and ensure product dimensional accuracy.

[0003] At present, polycarbonate (PC), acrylonitrile-butadiene-styrene copolymer (ABS) and its alloys are widely used in precision parts of electronic products. In PC / ABS alloy, PC provides rigidity and heat resistance, and ABS provides processability and toughness, which makes it have better performance advantages. However, traditional PC / ABS alloys still have some shortcomings, such as insufficient mechanical properties and heat resistance, which makes it difficult to meet the needs of high-impact scenarios and adapt to high-heat components such as high-performance processors; it is prone to hydrolysis and degradation in humid environments, resulting in deterioration of mechanical properties, poor dimensional stability, and high shrinkage during injection molding, which affects the assembly accuracy of precision parts. Therefore, it is of great significance to develop a plastic material for precision parts of electronic products that has good mechanical properties, heat resistance, water resistance and dimensional stability, and make it suitable for industrial production. Summary of the Invention

[0004] The purpose of the present invention is to address the deficiencies of the above-mentioned prior art and to provide a plastic for precision parts of electronic products and a preparation method thereof. The plastic for precision parts of electronic products has good mechanical properties, water resistance, heat resistance and dimensional stability. The preparation method is simple in process, easy to operate, and has high production efficiency, which is conducive to industrial production.

[0005] The object of the present invention is achieved by the following technical solution: A plastic for precision parts of electronic products, comprising the following raw materials in parts by weight: 60-70 parts of PC, 30-40 parts of ABS, 15-25 parts of glass fiber, 15-20 parts of filler, 5-10 parts of MBS, 2-8 parts of compatibilizer, 1-5 parts of coupling agent, 1-3 parts of antioxidant, 1-3 parts of lubricant, and 6-12 parts of functional additives.

[0006] Furthermore, the glass fiber is alkali-free chopped glass fiber.

[0007] Furthermore, the filler is at least one of calcium carbonate, talc powder, mica powder, aluminum oxide and barium sulfate.

[0008] Furthermore, the compatibilizer is at least one of styrene-maleic anhydride copolymer, ethylene-glycidyl methacrylate-maleic anhydride terpolymer and maleic anhydride grafted styrene-ethylene-butadiene-styrene block copolymer.

[0009] Furthermore, the coupling agent is at least one of a silane coupling agent, a titanate coupling agent, and an aluminate coupling agent. The silane coupling agent is at least one of γ-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, and γ-(methacryloyloxy)propyltrimethoxysilane.

[0010] Furthermore, the antioxidant is at least one of a hindered phenol antioxidant and a phosphite antioxidant.

[0011] Furthermore, the lubricant is at least one of vinyl bisstearamide, calcium stearate, zinc stearate, magnesium stearate, silicone powder, polyethylene wax and oxidized polyethylene wax.

[0012] Furthermore, the functional additive comprises the following raw materials in parts by weight: 3-5 parts of carboxyl-terminated hyperbranched polyester, 2-4 parts of polycarbodiimide, and 1-3 parts of polyetheresteramide. The carboxyl groups of the carboxyl-terminated hyperbranched polyester react with the N=C=N groups of the polycarbodiimide to form a crosslinked network. The present invention combines carboxyl-terminated hyperbranched polyester, polycarbodiimide, and polyetheresteramide, and the synergistic effect of each raw material, through chemical crosslinking and complementary optimization of physical properties, helps improve the compatibility between different components in the plastic formulation system, enhances the interfacial bonding strength of the plastic composite material, and helps achieve improvements in the mechanical properties, heat resistance, and processing performance of the plastic composite material.

[0013] Furthermore, the present invention aims to provide a method for preparing plastic for precision parts of electronic products, comprising the following steps: (1) mixing raw materials except glass fiber and coupling agent in proportion; (2) adding the mixed raw materials into an extruder from a main feed port; (3) adding glass fiber pre-treated with a silane coupling agent into the extruder from a side feed port, performing melt blending and then granulating to obtain plastic for precision parts of electronic products.

[0014] Furthermore, in step (3), the temperatures of each zone of the twin-screw extruder are: the extruder is a twin-screw extruder, and the temperatures of each zone of the twin-screw extruder are: zone 1 temperature: 220-230°C, zone 2 temperature: 230-240°C, zone 3 temperature: 235-245°C, zone 4 temperature: 240-250°C, zone 5 temperature: 240-250°C, and die head temperature: 240-250°C, and the side feed port is located in zone 3.

[0015] Furthermore, the screw speed of the twin-screw extruder is 300-500 rpm.

[0016] The beneficial effects of the present invention are as follows: the plastic for precision parts of electronic products of the present invention is compounded by PC, ABS, MBS with glass fiber and filler, and synergized with raw materials such as a compatibilizer, a functional additive and a coupling agent, so that the obtained plastic for precision parts of electronic products has good mechanical properties, water resistance, heat resistance and dimensional stability, and can be used to prepare precision parts of 3C consumer electronic products. The preparation method of the plastic for precision parts of electronic products is simple in process, easy to operate, stable in product quality, high in production efficiency, and is conducive to industrial production. DETAILED DESCRIPTION

[0017] In order to facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the embodiments. The contents mentioned in the embodiments are not intended to limit the present invention.

[0018] In some embodiments of the present invention, a plastic for precision parts of electronic products includes the following raw materials in parts by weight: 60-70 parts of PC, 30-40 parts of ABS, 15-25 parts of glass fiber, 15-20 parts of filler, 5-10 parts of MBS, 2-8 parts of compatibilizer, 1-5 parts of coupling agent, 1-3 parts of antioxidant, 1-3 parts of lubricant, and 6-12 parts of functional additives.

[0019] In some embodiments of the present invention, the glass fiber is alkali-free chopped glass fiber.

[0020] In some embodiments of the present invention, the filler is at least one of calcium carbonate, talc, mica powder, aluminum oxide and barium sulfate.

[0021] In some embodiments of the present invention, the compatibilizer is at least one of styrene-maleic anhydride copolymer, ethylene-glycidyl methacrylate-maleic anhydride terpolymer, and maleic anhydride grafted styrene-ethylene-butadiene-styrene block copolymer.

[0022] In some embodiments of the present invention, the coupling agent is at least one of a silane coupling agent, a titanate coupling agent, and an aluminate coupling agent. The silane coupling agent is at least one of γ-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, and γ-(methacryloyloxy)propyltrimethoxysilane.

[0023] In some embodiments of the present invention, the antioxidant is at least one of a hindered phenol antioxidant and a phosphite antioxidant.

[0024] In some embodiments of the present invention, the lubricant is at least one of vinyl bisstearamide, calcium stearate, zinc stearate, magnesium stearate, silicone powder, polyethylene wax and oxidized polyethylene wax.

[0025] In some embodiments of the present invention, the functional additive comprises the following raw materials in parts by weight: 3-5 parts of carboxyl-terminated hyperbranched polyester, 2-4 parts of polycarbodiimide, and 1-3 parts of polyetheresteramide.

[0026] In some embodiments of the present invention, a method for preparing plastic for precision parts of electronic products comprises the following steps: (1) mixing raw materials except glass fiber and coupling agent in proportion; (2) adding the mixed raw materials into an extruder from a main feed port; (3) adding glass fiber pre-treated with a silane coupling agent into the extruder from a side feed port, performing melt blending and then granulating to obtain plastic for precision parts of electronic products.

[0027] In some embodiments of the present invention, the temperatures of the zones of the twin-screw extruder are as follows: the extruder is a twin-screw extruder, the temperatures of the zones of the twin-screw extruder are: zone 1 temperature: 220-230°C, zone 2 temperature: 230-240°C, zone 3 temperature: 235-245°C, zone 4 temperature: 240-250°C, zone 5 temperature: 240-250°C, and die head temperature: 240-250°C. The side feed port is located in zone 3. The screw speed of the twin-screw extruder is 300-500 rpm.

[0028] Example 1

[0029] In this embodiment, a plastic for precision electronic product parts includes the following raw materials in parts by weight: 65 parts PC, 35 parts ABS, 20 parts glass fiber, 17 parts filler, 6 parts MBS, 5 parts compatibilizer, 3 parts coupling agent, 2 parts antioxidant, 2 parts lubricant, and 8.5 parts functional additive. The PC is Shandong Lihua Yiweiyuan WY-111BR. The ABS is Formosa Chemical AG15A1. The MBS is Kaneka M722.

[0030] Furthermore, the glass fiber is an alkali-free chopped glass fiber. The glass fiber has a length of 3-5 mm and a diameter of 8-12 μm. The filler comprises talc, alumina, and barium sulfate in a weight ratio of 1:1:1. The talc has a particle size of 20-40 nm, and the alumina has a particle size of 1-3 μm.

[0031] Furthermore, the compatibilizer is composed of an ethylene-glycidyl methacrylate-maleic anhydride terpolymer and a maleic anhydride-grafted styrene-ethylene-butadiene-styrene block copolymer in a weight ratio of 1:1. The ethylene-glycidyl methacrylate-maleic anhydride terpolymer is Sumitomo BF-7L, and the maleic anhydride-grafted styrene-ethylene-butadiene-styrene block copolymer is Kraton FG1901.

[0032] Furthermore, the coupling agent is a silane coupling agent, which is composed of γ-glycidyloxypropyltrimethoxysilane and γ-aminopropyltriethoxysilane in a weight ratio of 2:1.

[0033] Furthermore, the antioxidant is composed of antioxidant 1010 and antioxidant 168 in a weight ratio of 3:1. The lubricant is composed of vinyl bisstearamide and calcium stearate in a weight ratio of 1:1.

[0034] Furthermore, the functional additive comprises the following raw materials by weight: 4 parts carboxyl-terminated hyperbranched polyester, 3 parts polycarbodiimide, and 1.5 parts polyetheresteramide. The carboxyl-terminated hyperbranched polyester is Wuhan Hyperbranched Resin Technology's HyPer C102. The polycarbodiimide is Rhein Chemie's Stabaxol P.

[0035] Furthermore, a method for preparing plastic for precision parts of electronic products comprises the following steps: (1) mixing raw materials except glass fiber and coupling agent in proportion; (2) adding the mixed raw materials into an extruder from a main feed port; (3) adding glass fiber pre-treated with a silane coupling agent into the extruder from a side feed port, performing melt blending and granulation to obtain plastic for precision parts of electronic products.

[0036] Furthermore, in step (3), the glass fiber is pre-treated with a coupling agent, and the method for treating the glass fiber with a coupling agent comprises the following steps: in step (3), 4 parts of the coupling agent and 90 parts of a 20wt% ethanol aqueous solution are mixed uniformly by weight, the pH is adjusted to 5.0, and then 25 parts of the glass fiber are added and immersed for 30 minutes, and then dried for use.

[0037] Furthermore, in step (3), the temperatures of the zones of the twin-screw extruder are: the extruder is a twin-screw extruder, the temperatures of the zones of the twin-screw extruder are: zone 1 temperature: 225°C, zone 2 temperature: 235°C, zone 3 temperature: 240°C, zone 4 temperature: 245°C, zone 5 temperature: 245°C, and die head temperature: 245°C, and the side feed port is located in zone 3. The screw speed of the twin-screw extruder is 350 rpm.

[0038] Example 2

[0039] In this embodiment, a plastic for precision parts of electronic products includes the following raw materials in parts by weight: 68 parts of PC, 32 parts of ABS, 18 parts of glass fiber, 19 parts of filler, 6 parts of MBS, 5 parts of compatibilizer, 3 parts of coupling agent, 2 parts of antioxidant, 2 parts of lubricant, and 8.5 parts of functional additive.

[0040] Furthermore, the glass fiber is an alkali-free chopped glass fiber. The glass fiber has a length of 3-5 mm and a diameter of 8-12 μm. The filler comprises talc, alumina, and barium sulfate in a weight ratio of 1:1:1. The talc has a particle size of 20-40 nm, and the alumina has a particle size of 1-3 μm.

[0041] Furthermore, the compatibilizer is composed of ethylene-glycidyl methacrylate-maleic anhydride terpolymer and maleic anhydride grafted styrene-ethylene-butadiene-styrene block copolymer in a weight ratio of 1:1.

[0042] Furthermore, the coupling agent is a silane coupling agent, which is composed of γ-glycidyloxypropyltrimethoxysilane and γ-aminopropyltriethoxysilane in a weight ratio of 2:1.

[0043] Furthermore, the antioxidant is composed of antioxidant 1010 and antioxidant 168 in a weight ratio of 3:1. The lubricant is composed of vinyl bisstearamide and calcium stearate in a weight ratio of 1:1.

[0044] Furthermore, the functional additive comprises the following raw materials in parts by weight: 4 parts of carboxyl-terminated hyperbranched polyester, 3 parts of polycarbodiimide, and 1.5 parts of polyetheresteramide.

[0045] Furthermore, a method for preparing plastic for precision parts of electronic products comprises the following steps: (1) mixing raw materials except glass fiber and coupling agent in proportion; (2) adding the mixed raw materials into an extruder from a main feed port; (3) adding glass fiber pre-treated with a silane coupling agent into the extruder from a side feed port, performing melt blending and granulation to obtain plastic for precision parts of electronic products.

[0046] Furthermore, in step (3), the temperatures of the zones of the twin-screw extruder are: the extruder is a twin-screw extruder, the temperatures of the zones of the twin-screw extruder are: zone 1 temperature: 225°C, zone 2 temperature: 235°C, zone 3 temperature: 240°C, zone 4 temperature: 245°C, zone 5 temperature: 245°C, and die head temperature: 245°C, and the side feed port is located in zone 3. The screw speed of the twin-screw extruder is 350 rpm.

[0047] The rest of the content of this embodiment is the same as that of embodiment 1.

[0048] Example 3

[0049] In this embodiment, a plastic for precision parts of electronic products includes the following raw materials in parts by weight: 65 parts of PC, 30 parts of ABS, 20 parts of glass fiber, 17 parts of filler, 9 parts of MBS, 5 parts of compatibilizer, 3 parts of coupling agent, 2 parts of antioxidant, 2 parts of lubricant, and 10.5 parts of functional additive.

[0050] Furthermore, the glass fiber is an alkali-free chopped glass fiber. The glass fiber has a length of 3-5 mm and a diameter of 8-12 μm. The filler comprises talc, alumina, and barium sulfate in a weight ratio of 1:1:1. The talc has a particle size of 20-40 nm, and the alumina has a particle size of 1-3 μm.

[0051] Furthermore, the compatibilizer is composed of ethylene-glycidyl methacrylate-maleic anhydride terpolymer and maleic anhydride grafted styrene-ethylene-butadiene-styrene block copolymer in a weight ratio of 1:1.

[0052] Furthermore, the coupling agent is a silane coupling agent, which is composed of γ-glycidyloxypropyltrimethoxysilane and γ-aminopropyltriethoxysilane in a weight ratio of 2:1.

[0053] Furthermore, the antioxidant is composed of antioxidant 1010 and antioxidant 168 in a weight ratio of 3:1. The lubricant is composed of vinyl bisstearamide and calcium stearate in a weight ratio of 1:1.

[0054] Furthermore, the functional additive comprises the following raw materials in parts by weight: 4.5 parts of carboxyl-terminated hyperbranched polyester, 3 parts of polycarbodiimide, and 2 parts of polyetheresteramide.

[0055] Furthermore, a method for preparing plastic for precision parts of electronic products comprises the following steps: (1) mixing raw materials except glass fiber and coupling agent in proportion; (2) adding the mixed raw materials into an extruder from a main feed port; (3) adding glass fiber pre-treated with a silane coupling agent into the extruder from a side feed port, performing melt blending and granulation to obtain plastic for precision parts of electronic products.

[0056] Furthermore, in step (3), the temperatures of the zones of the twin-screw extruder are: the extruder is a twin-screw extruder, the temperatures of the zones of the twin-screw extruder are: zone 1 temperature: 225°C, zone 2 temperature: 235°C, zone 3 temperature: 240°C, zone 4 temperature: 245°C, zone 5 temperature: 245°C, and die head temperature: 245°C, and the side feed port is located in zone 3. The screw speed of the twin-screw extruder is 350 rpm.

[0057] The rest of the content of this embodiment is the same as that of embodiment 1.

[0058] Comparative Example 1

[0059] The difference between this comparative example and Example 1 is that the plastic for precision parts of electronic products in this comparative example does not contain functional additives.

[0060] Comparative Example 2

[0061] The difference between this comparative example and Example 1 is that the plastic for precision parts of electronic products in this comparative example does not contain MBS, but is replaced by a mixture of equal amounts of PC and ABS. The mass ratio of PC to ABS in the composite plastic of this comparative example is the same as that in Example 1.

[0062] Comparative Example 3

[0063] The difference between this comparative example and Example 1 is that the functional additive in the plastic for precision parts of electronic products in this comparative example does not contain carboxyl-terminated hyperbranched polyester.

[0064] The plastic pellets prepared in Examples 1-3 and Comparative Examples 1-3 were dried and injection molded to prepare specimens with a size of 80 mm × 10 mm × 4 mm. The performance tests of the specimens prepared in Examples 1-3 and Comparative Examples 1-2 were carried out, and the test results are shown in Table 1 below:

[0065]

[0066] Among them, the tensile strength is tested with reference to GB / T 1040.2-2022. The flexural strength is tested with reference to GB / T 9341-2008. The notched cantilever beam impact strength is tested with reference to GB / T 1843-2008. The water absorption is tested with reference to GB / T 3857-2017, and the sample is immersed in 23°C water for 48 hours, and the weight increase percentage is tested. The heat deformation temperature is tested with reference to GB / T1634.2-2004. The molding shrinkage is measured with reference to GB / T 17037.4-2003, and the test conditions are a 60*60*2mm cavity, a pressure of 50MPa, a temperature of 23°C, a humidity of 50% RH, and a processing time of 20 hours. The flame retardant ratings of Examples 1-3 and Comparative Examples 1-3 are all UL94 V-0.

[0067] In summary, the plastic for precision parts of electronic products of the present invention is prepared by compounding PC, ABS, and MBS as a base plastic, adding glass fiber and fillers for reinforcement, and synergizing with raw materials such as a compatibilizer, a functional additive, and a coupling agent. The obtained plastic for precision parts of electronic products has good mechanical properties, water resistance, heat resistance, and dimensional stability, and is suitable for preparing precision parts of 3C consumer electronic products and other plastic products. The preparation method of the plastic for precision parts of electronic products is simple in process, easy to operate, has stable product quality, high production efficiency, and is conducive to industrial production.

[0068] The above specific embodiments are further explanations of the technical solutions and beneficial effects of the present invention, and are not intended to limit the implementation methods. For those skilled in the art, any obvious substitutions that do not depart from the concept of the present invention are within the scope of protection of the present invention.

Claims

1. A plastic for precision parts of electronic products, characterized by: The invention comprises the following raw materials in parts by weight: 60-70 parts of PC, 30-40 parts of ABS, 15-25 parts of glass fiber, 15-20 parts of filler, 5-10 parts of MBS, 2-8 parts of compatibilizer, 1-5 parts of coupling agent, 1-3 parts of antioxidant, 1-3 parts of lubricant and 6-12 parts of functional additive.

2. The plastic for precision parts of electronic products according to claim 1, characterized in that: The glass fiber is alkali-free chopped glass fiber.

3. The plastic for precision parts of electronic products according to claim 1, characterized in that: The filler is at least one of calcium carbonate, talc powder, mica powder, aluminum oxide and barium sulfate.

4. The plastic for precision parts of electronic products according to claim 1, characterized in that: The compatibilizer is at least one of styrene-maleic anhydride copolymer, ethylene-glycidyl methacrylate-maleic anhydride terpolymer and maleic anhydride grafted styrene-ethylene-butadiene-styrene block copolymer.

5. The plastic for precision parts of electronic products according to claim 1, characterized in that: The coupling agent is at least one of a silane coupling agent, a titanate coupling agent and an aluminate coupling agent.

6. The plastic for precision parts of electronic products according to claim 1, characterized in that: The antioxidant is at least one of a hindered phenol antioxidant and a phosphite antioxidant.

7. The plastic for precision parts of electronic products according to claim 1, characterized in that: The lubricant is at least one of vinyl bisstearamide, calcium stearate, zinc stearate, magnesium stearate, silicone powder, polyethylene wax and oxidized polyethylene wax.

8. The plastic for precision parts of electronic products according to claim 1, characterized in that: The functional additive comprises the following raw materials in parts by weight: 3-5 parts of carboxyl-terminated hyperbranched polyester, 2-4 parts of polycarbodiimide, and 1-3 parts of polyetheresteramide.

9. The method for preparing plastic for precision parts of electronic products according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: (1) mixing raw materials except glass fiber and coupling agent in proportion; (2) adding the mixed raw materials into an extruder from a main feed port; (3) adding glass fiber pre-treated with a silane coupling agent into the extruder from a side feed port, performing melt blending and granulation to obtain plastic for precision parts of electronic products.

10. The method for preparing plastic for precision parts of electronic products according to claim 9, characterized in that: In step (3), the temperatures of the various zones of the twin-screw extruder are: the extruder is a twin-screw extruder, and the temperatures of the various zones of the twin-screw extruder are: zone 1 temperature: 220-230°C, zone 2 temperature: 230-240°C, zone 3 temperature: 235-245°C, zone 4 temperature: 240-250°C, zone 5 temperature: 240-250°C, and die head temperature: 240-250°C, and the side feed port is located in zone 3.

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