PBT alloy material with high glowing wire ignition temperature and preparation method thereof

Abstract

The present application relates to a kind of high glowing filament ignition temperature PBT alloy material and its preparation method.The alloy material includes PBT resin, PC-PDMS, fumed silica, PTFE and auxiliary agent, wherein, the mass ratio of PBT resin, PC-PDMS, fumed silica and PTFE is (70-85):(10-20):(5-10):(1-2).Preparation method includes the following steps: premixing according to weight ratio each component, the obtained mixture is blended by twin-screw extruder melt, extrusion granulation, i.e. high glowing filament ignition temperature PBT alloy material.Compared with prior art, the material physical property of the present application is excellent, has high glowing filament ignition temperature, can be widely used in kitchen appliances, charging equipment and other plastic products with electrical contact, has wide application prospect.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of PBT alloy, in particular to a PBT alloy material with high glow wire ignition temperature and a preparation method thereof. BACKGROUND

[0002] PC / PBT is a plastic alloy, which maintains the chemical resistance and easy molding of crystalline material PBT, and also has the toughness and dimensional stability of non-crystalline material PC. Its products are widely used in automobile bumpers, automobile handles, electronic components, etc. PC / PBT has the comprehensive properties of PC and PBT, such as high toughness and geometric stability of PC, and chemical stability, thermal stability and lubrication properties of PBT.

[0003] PBT alloy material has excellent electrical properties, is convenient for injection molding, and has a very wide range of applications. However, since the material is often used in electronic and electrical products, it often encounters exposed high-temperature components such as bare wires. If its glow wire ignition temperature is low, it is easy to catch fire and cause a fire. Therefore, there is a higher requirement for the glow wire ignition temperature of PBT alloy material. SUMMARY

[0004] The purpose of the present application is to provide a PBT alloy material with high glow wire ignition temperature and a preparation method thereof, which forms a double network structure and effectively improves the glow wire ignition temperature.

[0005] The purpose of the present application can be achieved by the following technical solutions:

[0006] A PBT alloy material with high glow wire ignition temperature, the alloy material comprising PBT resin, PC-PDMS, fumed silica, PTFE and additives, wherein the mass ratio of PBT resin, PC-PDMS, fumed silica and PTFE is (70-85):(10-20):(5-10):(1-2).

[0007] Further, the mass ratio of PBT resin, PC-PDMS, fumed silica and PTFE is (75-80):(10-15):(5-10):(1-2).

[0008] Further, the alloy material comprises the following components and weight contents:

[0009]

[0010] The other additives include antioxidants, ultraviolet absorbers and lubricants.

[0011] Further, the PBT resin has an intrinsic viscosity of 0.8-1.2 dl / g. Further, the PC-PDMS is a polydimethylsiloxane-polycarbonate copolymer. Further, in the PC-PDMS, the molar ratio of the PDMS segment and the PC segment is 1:9-2:8. Further, the fumed silica is an artificially synthesized fumed silica, has a particle size range D50 of 3-10 μm, and has a porosity of >90%. Further, the compatibilizer is AS-GMA, wherein the GMA content is 1-10 wt%, and a GMA content exceeding 10% will cause the material to crosslink and be unable to be extruded and granulated. Preferably, the GMA content is 1%.

[0012] Further, the lubricant is barium stearate; the mass ratio of the antioxidant, the ultraviolet absorber, and the lubricant is 1:1:1.

[0013] A preparation method of the high glow-wire ignition temperature PBT alloy material as described above, the method comprising the following steps:

[0014] The components are premixed in a weight ratio, and the obtained mixture is blended, melted, and extruded and granulated by a twin-screw extruder, so as to obtain the high glow-wire ignition temperature PBT alloy material.

[0015] Further, the barrel temperature of the twin-screw extruder is 240-290°C, the screw rotation speed is 200-600 rpm, and the pressure is 1.5-2.5 MPa.

[0016] Compared with the prior art, the present application develops a high glow-wire ignition temperature PBT alloy material. In the material, the siloxane segment in the PC-PDMS is combined with the fumed silica to form a silicon-oxygen bond network covering the surface of the product. At the same time, the fiberization of the PTFE also covers the surface of the material to form a double-network structure. When the material is subjected to high temperature, the double-network of the material shrinks to avoid the burning of the base material, and the glow-wire ignition temperature of the material can be effectively improved from 750°C to 850°C. The material can be widely applied to kitchen appliances, charging equipment, and other products, and has great application prospects. DETAILED DESCRIPTION

[0017] The embodiments of the present application are described in detail below, and the embodiments are implemented on the premise of the technical solutions of the present application, and detailed implementation manners and specific operation processes are given, but the protection scope of the present application is not limited to the following embodiments.

[0018] The raw materials used in the following examples and comparative examples are as follows: PBT with intrinsic viscosity of 1.0 dl / g, Taiwan Changchun Enterprise Group; PC-PDMS, LG8000 from LG Chemical, with PDMS to PC segment molar ratio of 1:9; fumed silica D50 of 4 μm, porosity greater than 90%, Nanotech Technology Co., Ltd.; PTFE, A3800 from Mitsubishi Chemical Corporation, Japan; compatibilizer, SAG001 with GMA content of 1 wt%, produced by Shanghai Risheng Fine Chemical Co., Ltd.; other additives including antioxidant B900 (Ciba), ultraviolet absorber Tinuvins UVP (Ciba), lubricant barium stearate, and each additive is in a weight ratio of 1:1:1.

[0019] After drying the high glow-to-ignition temperature PBT alloy materials prepared in Examples 1-4 and Comparative Examples 1-3 at 80°C for 5 h, the physical properties were tested according to ASTM standards, and the samples were injection molded for testing; according to IEC60695 standards, 160 mm x 100 mm x 3 mm samples were injection molded, and the glow-to-ignition temperature was tested.

[0020] Table 1

[0021] Physical properties Test conditions Test standard Izod notched impact strength (1 / 8) (J / m) 23℃ ASTM D256-10 Glowing wire ignition temperature 160 mm x 100 mm x 3 mm IEC 60695

[0022] Example 1

[0023] A high glow-to-ignition temperature PBT alloy material and a preparation method thereof, and the specific steps are as follows:

[0024] (1) Each component is weighed according to the weight ratio in Table 2;

[0025] (2) The ingredients are prepared according to the formula, and each component is premixed in a mixing barrel, and then used after being uniformly mixed;

[0026] (3) The mixture obtained in step (2) is blended, melted, and extruded into granules by a twin-screw extruder, and the product is obtained.

[0027] The mixed mixture is fed into the main feeding of the twin-screw extruder, and the sample is obtained by melting extrusion, cooling, drying, and granulation; wherein the twin-screw extruder is a co-rotating twin-screw extruder, the length-diameter ratio of the screw is 40:1, and the screw barrel is provided with a vacuum exhaust device and a temperature control device; the feeding section temperature of the twin-screw extruder is 160°C, the plasticizing section temperature is 240°C, the homogenizing section temperature is 290°C, the screw rotation speed is 400 rpm, and the pressure is 2.5 MPa.

[0028] Example 2

[0029] A high glow-to-ignition temperature PBT alloy material and a preparation method thereof, and the raw material weight ratio is shown in Table 2, and the preparation method is the same as that of Example 1.

[0030] Example 3

[0031] A PBT alloy material with high glow wire ignition temperature and its preparation method, the raw material weight ratio is shown in Table 2, and the preparation method is the same as that of Example 1.

[0032] Example 4

[0033] A PBT alloy material with high glow wire ignition temperature and its preparation method, the raw material weight ratio is shown in Table 2, and the preparation method is the same as that of Example 1.

[0034] Comparative Example 1

[0035] A PBT alloy material and its preparation method, the raw material weight ratio is shown in Table 2, and the preparation method is the same as that of Example 1.

[0036] Comparative Example 2

[0037] A PBT alloy material and its preparation method, the raw material weight ratio is shown in Table 2, and the preparation method is the same as that of Example 1.

[0038] Comparative Example 3

[0039] A PBT alloy material and its preparation method, the raw material weight ratio is shown in Table 2, and the preparation method is the same as that of Example 1.

[0040] Table 2

[0041] Components Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 PBT resin 75 80 80 85 75 80 75 PC-PDMS 15 15 10 10 0 15 15 Fumed silica 10 5 10 5 10 0 10 PTFE 1 1 2 2 2 2 0 Compatibilizer 2 2 2 2 2 2 2 Auxiliary agent 1 1 1 1 1 1 1

[0042] The physical properties and light resistance test results of the PC resins of Examples 1-4 and Comparative Examples 1-3 are shown in Table 3 below.

[0043] Table 3

[0044] Performance index Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Izod notched impact strength (1 / 8) (J / m) 124 116 109 127 77 157 125 Glowing wire ignition temperature (°C) 850 850 850 850 750 750 750

[0045] As shown in the test results of Examples 1-4 and Comparative Examples 1-3 in Table 3, by combining the siloxane segments in PC-PDMS with fumed silica, a network of siloxane bonds is formed to coat the surface of the product. At the same time, through the fiberization of PTFE, it is also coated on the surface of the material to form a double network structure. When the material is subjected to high temperature, the double network of the material shrinks to avoid the burning of the substrate, which can effectively improve the glow wire ignition temperature, which can be increased from 750℃ to 850℃.

[0046] Compared with Example 1, the ignition temperature of glowing wire and the impact strength of Comparative Example 1 decrease due to the lack of PC-PDMS. The PDMS chain segment in PC-PDMS is a flexible chain, which plays a toughening role and improves the impact strength of the product. At the same time, the PDMS chain segment combines with fumed silica in the material to form a siloxane bond network coating, which is coated with the network after the fiberization of PTFE, forming a double network structure, which can effectively improve the ignition temperature of the glowing wire of the material.

[0047] Compared with Example 1, the ignition temperature of glowing wire of Comparative Example 3 decreases due to the lack of PTFE, and the impact strength changes little. Because the PDMS chain segment in the material still plays a toughening role, it has little effect on impact. However, the lack of PTFE cannot form a PTFE coating network in the material, and cannot form a double network structure, so it cannot improve the ignition temperature of the glowing wire of the material.

[0048] Compared with Comparative Example 2, Example 2 uses fumed silica, although the impact strength decreases, the ignition temperature of the glowing wire increases. Because the added fumed silica forms a siloxane bond network, which is coated with the network after the fiberization of PTFE, forming a double network structure, which can effectively improve the ignition temperature of the glowing wire of the material.

[0049] The above is only a preferred embodiment of the present application, and is not a limitation on other forms of the present application. Any skilled person in the art can modify or change the above disclosed technical content to equivalent embodiments. However, any simple modification, equivalent change and modification of the above embodiments without departing from the technical solution of the present application, according to the technical essence of the present application, still belongs to the protection scope of the technical solution of the present application.

Claims

1. A PBT alloy material with high glowing wire ignition temperature, characterized in that, The alloy material comprises the following components and weight content: PBT resin 70-85 parts PC-PDMS 10-20 parts Fumed silica 5-10 parts PTFE 1-2 parts Compatibility agent 1-2 parts Other additives 0.1-1 parts; The other additives include antioxidants, ultraviolet absorbers and lubricants; The PC-PDMS is a polydimethylsiloxane-polycarbonate copolymer; In PC-PDMS, the molar ratio of PDMS segment to PC segment is 1:9-2:8; The fumed silica has a particle size range D50 of 3-10 μm and a porosity of >90%.

2. The PBT alloy material with high glow wire ignition temperature according to claim 1, characterized in that, The PBT resin has an intrinsic viscosity of 0.8-1.2 dl / g.

3. The PBT alloy material with high glow wire ignition temperature according to claim 1, characterized in that, The compatibility agent is AS-GMA, wherein the GMA content is 1-10 wt%.

4. A method of producing a PBT alloy material having a high glow wire ignition temperature according to claim 1, characterized by, The method comprises the following steps: The components are premixed in a weight ratio, and the obtained mixture is blended, melted and extruded by a twin-screw extruder to obtain the PBT alloy material with high glowing wire ignition temperature.

5. The method of claim 4, wherein the PBT alloy material has a high glow wire ignition temperature. The barrel temperature of the twin-screw extruder is 240-290℃, the screw rotation speed is 200-600 rpm, and the pressure is 1.5-2.5 MPa.

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