Scratch-resistant weatherable pbt composites and methods for making the same

Abstract

The application discloses a kind of scratch-resistant weather-resistant PBT composite material and preparation method thereof, belong to the field of high polymer materials.The composite material includes the following weight parts raw materials: PBT resin 70~90 parts;Titanium dioxide 10~30 parts;Coupling agent 2~5 parts;Zirconium phosphate 5-10 parts;The PBT resin specific viscosity 0.65~0.95dL / g;The total weight of PBT resin and titanium dioxide is 100 parts.Summarizes relative to prior art, the PBT composite material of the application has excellent scratch resistance, weather resistance, good quality, and has very high application potential in the bathroom industry.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, and in particular to scratch-resistant and weather-resistant PBT composite materials and their preparation methods. Background Technology

[0002] Polybutylene terephthalate (PBT) is one of the five major general-purpose engineering plastics. It is a crystalline thermoplastic polyester with excellent scratch resistance, heat resistance, electrical insulation, processability, low water absorption, and resistance to chemical solvents. It is widely used in electronics, automotive, and home appliance components. With the continuous development of PBT modification methods, its applications are becoming increasingly widespread.

[0003] Currently, the main materials used for toilet fittings in the bathroom industry are urea-formaldehyde resin, acrylic, and PP. Urea-formaldehyde resin and acrylic are expensive, while PP has poor scratch and weather resistance and low density, resulting in a texture that is far inferior to ceramic. Among general-purpose plastics and commonly used engineering plastics, PBT resin has great application potential in the bathroom industry due to its high density, reasonable price, and excellent scratch and weather resistance. Therefore, developing a PBT composite material with excellent scratch resistance, weather resistance, and good texture is of great value. Summary of the Invention

[0004] Therefore, it is necessary to provide a PBT composite material with superior scratch resistance, excellent weather resistance and good texture, which can be mainly used in the sanitary ware industry, such as toilet seats, flush tank seats and toilet connection parts.

[0005] To achieve the above objectives, the present invention adopts the following solution:

[0006] A first aspect of the present invention relates to a scratch-resistant and weather-resistant PBT composite material, comprising the following raw materials in parts by weight:

[0007]

[0008] The intrinsic viscosity of the PBT resin is 0.65–0.95 dL / g; the total weight of the PBT resin and titanium dioxide is 100 parts.

[0009] Optionally, it may also include 0.4 to 0.5 parts by weight of ultraviolet absorber and / or 0.1 to 0.3 parts by weight of antioxidant.

[0010] Optionally, the titanium dioxide accounts for more than 20% by weight in the raw material.

[0011] Optionally, the titanium dioxide is rutile titanium dioxide with a mesh size of 8000-1000 mesh.

[0012] Optionally, the coupling agent is at least one of silane-type coupling agents.

[0013] Optionally, the zirconium phosphate is α-zirconium phosphate, comprising a mixture of Zr(HPO4)2·H2O and ZrO2.

[0014] Optionally, the ultraviolet absorber is at least one of salicylates, benzophenones, benzotriazoles, substituted acrylonitriles, and triazine ultraviolet absorbers.

[0015] The antioxidant is at least one of hindered phenolic antioxidants, hindered amine antioxidants, phosphate ester antioxidants, and thioester antioxidants.

[0016] In one embodiment, the antioxidant is a mixture of pentaerythritol [β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] (antioxidant 1010) and tris[2,4-di-tert-butylphenyl] phosphite (antioxidant 168). A preferred weight ratio is 1:0.5 to 1.5.

[0017] A second aspect of the present invention relates to a method for preparing a scratch-resistant and weather-resistant PBT composite material, comprising the following steps:

[0018] Take PBT resin and dry it; mix 10-30 parts by weight of titanium dioxide with 2-5 parts by weight of coupling agent.

[0019] Then add 70-90 parts by weight of the PBT resin and 5-10 parts by weight of zirconium phosphate and stir to mix; wherein the total weight of the PBT resin and titanium dioxide is 100.

[0020] Optionally, the extruder process parameters for the melt extrusion are as follows: zone 1 temperature is 160-180℃, zone 2 temperature is 240-260℃, zone 3 temperature is 240-260℃, zone 4 temperature is 240-260℃, zone 5 temperature is 240-260℃, zone 6 temperature is 220-240℃, zone 7 temperature is 220-240℃, zone 8 temperature is 220-240℃, die temperature is 240-260℃, and screw speed is 300-500 rpm.

[0021] A third aspect of the present invention relates to the application of the above-mentioned scratch-resistant and weather-resistant PBT composite material in the preparation of sanitary ware products.

[0022] The principle of this invention is as follows:

[0023] To prepare a scratch-resistant and weather-resistant PBT composite material, this invention adopts a titanium dioxide-filled modified PBT scheme. Titanium dioxide filler has high density and strong hiding power. The modified PBT material has high density and excellent ceramic-like texture. Furthermore, due to the excellent matting properties of titanium dioxide, the weather resistance of the composite material can be greatly improved.

[0024] Moreover, by pre-mixing the coupling agent with titanium dioxide, the coupling agent and titanium dioxide can interact fully. The coupling agent is amphiphilic, which improves the dispersibility of titanium dioxide in the composite material and prevents the composite material from being poor in performance and appearance due to titanium dioxide agglomeration.

[0025] Meanwhile, the use of PBT resin with a certain intrinsic viscosity improves the fluidity of the material, enhances the dispersion of titanium dioxide in the resin matrix, and improves the appearance of the material.

[0026] Meanwhile, zirconium phosphate is a novel layered multifunctional mesoporous material with excellent lubrication properties. It can adhere to the secondary surface of materials to form a protective film, significantly improving the wear and scratch resistance of the materials. In addition, zirconium phosphate has a large specific surface area and a high affinity for organic resins and inorganic fillers. It can greatly increase the interfacial strength between resins and inorganic fillers, improve the dispersibility of inorganic fillers in resins, and enhance the appearance of composite materials.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] The PBT composite material of the present invention has the characteristics of superior scratch resistance, excellent weather resistance and good texture.

[0029] Specifically as follows:

[0030] 1. The PBT composite material described in this invention possesses superior scratch resistance, excellent weather resistance, and a superior texture. It employs a titanium dioxide-filled modified PBT scheme. The titanium dioxide filler has a high density and strong hiding power, resulting in a high-density PBT material with a ceramic-like texture and excellent weather resistance. Furthermore, the pre-mixing treatment of titanium dioxide with a coupling agent, which has amphiphilic properties, improves the dispersibility of titanium dioxide in the composite material, preventing agglomeration that could lead to poor performance and appearance. Simultaneously, the use of PBT resin with a specific viscosity enhances the material's fluidity, strengthens the dispersion of titanium dioxide in the resin matrix, and improves the material's appearance. Additionally, zirconium phosphate, a novel layered multifunctional mesoporous material, possesses excellent lubrication properties and can adhere to the secondary surface of the material to form a protective film, significantly improving the material's wear and scratch resistance. Furthermore, zirconium phosphate has a large specific surface area and a high affinity for both organic resins and inorganic fillers, greatly increasing the interfacial strength between the resin and inorganic fillers, improving the dispersibility of inorganic fillers in the resin, and enhancing the composite material's appearance.

[0031] 2. The raw materials required for the PBT composite material of this invention are all available on the market and are relatively easy to obtain.

[0032] 3. The preparation method of the PBT composite material of the present invention is simple and easy to operate, does not cause environmental pollution, and is easy to realize industrial continuous production. Attached Figure Description

[0033] Figure 1 This is a process flow diagram for preparing the scratch-resistant, weather-resistant, and high-quality PBT composite material of the present invention. Detailed Implementation

[0034] The PBT composite material and its preparation method of the present invention will be further described in detail below with reference to specific embodiments.

[0035] The raw materials used in the embodiments of the present invention are as follows:

[0036] Polybutylene terephthalate (PBT), selected from Bluestar Nantong Xingchen Synthetic Materials PBT 1084, has an intrinsic viscosity of 0.84±0.02 dL / g;

[0037] Titanium dioxide, selected from DuPont R103, with a mesh size of 8000;

[0038] Coupling agents such as γ-aminopropyltrimethoxysilane were selected from Zhejiang Boiling Point Chemical Co., Ltd.

[0039] UV absorbers such as UV234 are selected from BASF, Germany;

[0040] The zirconium phosphate used in this embodiment is α-zirconium phosphate, selected from Mianzhu Yaolong Chemical Co., Ltd.;

[0041] Antioxidants such as pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid] (antioxidant 1010) and tris[2,4-di-tert-butylphenyl] phosphite (antioxidant 168) were selected from Yixing Angel Synthetic Chemical Co., Ltd. In the examples, a mixture of the two was used in a weight ratio.

[0042] Example 1:

[0043] This embodiment describes a scratch-resistant and weather-resistant PBT composite material, prepared from the following raw materials in parts by weight:

[0044]

[0045] The preparation method of the above-mentioned PBT composite material includes the following steps:

[0046] Step 1: Dry the PBT resin at 140℃ for 4 hours. After drying, cool it to room temperature. Put the titanium dioxide and coupling agent into a high-speed mixer (800r / min) and mix them at room temperature for 30 minutes.

[0047] Step 2: Place the PBT resin, titanium dioxide, coupling agent (γ-aminopropyltrimethoxysilane), ultraviolet absorber (UV234), zirconium phosphate and antioxidant (antioxidant 1010: antioxidant 168 = 1:1) into a mixer (300 r / min) and mix for 5 min at room temperature.

[0048] Step 3: Add the mixed material from Step 2 into the hopper of a parallel twin-screw extruder. After melt extrusion, cooling, air drying, and pelletizing, the process parameters are as follows: Zone 1 temperature 160℃, Zone 2 temperature 240℃, Zone 3 temperature 240℃, Zone 4 temperature 240℃, Zone 5 temperature 240℃, Zone 6 temperature 220℃, Zone 7 temperature 220℃, Zone 8 temperature 220℃, die temperature 240℃, and screw speed 300 rpm. The properties of this composite material are shown in Table 2.

[0049] Example 2:

[0050] This embodiment describes a scratch-resistant and weather-resistant PBT composite material, prepared from the following raw materials in parts by weight:

[0051]

[0052] The preparation method of the above-mentioned PBT composite material includes the following steps:

[0053] Step 1: Dry the PBT resin at 140℃ for 4 hours. After drying, cool it to room temperature. Put the titanium dioxide and coupling agent into a high-speed mixer (1000r / min) and mix them at room temperature for 30 minutes.

[0054] Step 2: Place the PBT resin, titanium dioxide, coupling agent (γ-aminopropyltrimethoxysilane), ultraviolet absorber (UV234), zirconium phosphate and antioxidant (antioxidant 1010: antioxidant 168 = 1:1) into a mixer (500 r / min) and mix for 5 min at room temperature.

[0055] Step 3: The mixed material from Step 2 is added to the hopper of a parallel twin-screw extruder. After melt extrusion, cooling, air drying, and pelletizing, the process parameters are as follows: Zone 1 temperature 160℃, Zone 2 temperature 240℃, Zone 3 temperature 240℃, Zone 4 temperature 240℃, Zone 5 temperature 240℃, Zone 6 temperature 220℃, Zone 7 temperature 220℃, Zone 8 temperature 220℃, die temperature 240℃, and screw speed 400 rpm. The properties of this composite material are shown in Table 2.

[0056] Example 3:

[0057] This embodiment describes a scratch-resistant and weather-resistant PBT composite material, prepared from the following raw materials in parts by weight:

[0058]

[0059] The preparation method of the above-mentioned PBT composite material includes the following steps:

[0060] Step 1: Dry the PBT resin at 140℃ for 4 hours. After drying, cool it to room temperature. Put the titanium dioxide and coupling agent into a high-speed mixer (1000r / min) and mix them at room temperature for 30 minutes.

[0061] Step 2: Place the PBT resin, titanium dioxide, coupling agent (γ-aminopropyltrimethoxysilane), ultraviolet absorber (UV234), zirconium phosphate and antioxidant (antioxidant 1010: antioxidant 168 = 1:1) into a mixer (500 r / min) and mix for 5 min at room temperature.

[0062] Step 3: The mixed material from Step 2 is added to the hopper of a parallel twin-screw extruder. After melt extrusion, cooling, air drying, and pelletizing, the process parameters are as follows: Zone 1 temperature 160℃, Zone 2 temperature 240℃, Zone 3 temperature 240℃, Zone 4 temperature 240℃, Zone 5 temperature 240℃, Zone 6 temperature 220℃, Zone 7 temperature 220℃, Zone 8 temperature 220℃, die temperature 240℃, and screw speed 400 rpm. The properties of this composite material are shown in Table 2.

[0063] Example 4:

[0064] This embodiment describes a scratch-resistant and weather-resistant PBT composite material, prepared from the following raw materials in parts by weight:

[0065]

[0066] The preparation method of the above-mentioned PBT composite material includes the following steps:

[0067] Step 1: Dry the PBT resin at 140℃ for 4 hours. After drying, cool it to room temperature. Put the titanium dioxide and coupling agent into a high-speed mixer (1000r / min) and mix them at room temperature for 30 minutes.

[0068] Step 2: Place the PBT resin, titanium dioxide, coupling agent (γ-aminopropyltrimethoxysilane), ultraviolet absorber (UV234), zirconium phosphate and antioxidant (antioxidant 1010: antioxidant 168 = 1:1) into a mixer (500 r / min) and mix for 5 min at room temperature.

[0069] Step 3: The mixed material from Step 2 is added to the hopper of a parallel twin-screw extruder. After melt extrusion, cooling, air drying, and pelletizing, the process parameters are as follows: Zone 1 temperature 160℃, Zone 2 temperature 240℃, Zone 3 temperature 240℃, Zone 4 temperature 240℃, Zone 5 temperature 240℃, Zone 6 temperature 220℃, Zone 7 temperature 220℃, Zone 8 temperature 220℃, die temperature 240℃, and screw speed 400 rpm. The properties of this composite material are shown in Table 2.

[0070] Example 5:

[0071] This embodiment describes a scratch-resistant and weather-resistant PBT composite material, prepared from the following raw materials in parts by weight:

[0072]

[0073] The preparation method of the above-mentioned PBT composite material includes the following steps:

[0074] Step 1: Dry the PBT resin at 140℃ for 4 hours. After drying, cool it to room temperature. Put the titanium dioxide and coupling agent into a high-speed mixer (1000r / min) and mix them at room temperature for 30 minutes.

[0075] Step 2: Place the PBT resin, titanium dioxide, coupling agent (γ-aminopropyltrimethoxysilane), ultraviolet absorber (UV234), zirconium phosphate and antioxidant (antioxidant 1010: antioxidant 168 = 1:1) into a mixer (500 r / min) and mix for 5 min at room temperature.

[0076] Step 3: Add the mixed material from Step 2 into the hopper of a parallel twin-screw extruder. After melt extrusion, cooling, air drying, and pelletizing, the process parameters are as follows: Zone 1 temperature 160℃, Zone 2 temperature 250℃, Zone 3 temperature 250℃, Zone 4 temperature 250℃, Zone 5 temperature 250℃, Zone 6 temperature 230℃, Zone 7 temperature 230℃, Zone 8 temperature 230℃, die temperature 250℃, and screw speed 500 rpm. The properties of this composite material are shown in Table 2.

[0077] Example 6:

[0078] This embodiment describes a scratch-resistant and weather-resistant PBT composite material, prepared from the following raw materials in parts by weight:

[0079]

[0080] The preparation method of the above-mentioned PBT composite material includes the following steps:

[0081] Step 1: Dry the PBT resin at 140℃ for 4 hours. After drying, cool it to room temperature. Put the titanium dioxide and coupling agent into a high-speed mixer (1000r / min) and mix them at room temperature for 30 minutes.

[0082] Step 2: Place the PBT resin, titanium dioxide, coupling agent (γ-aminopropyltrimethoxysilane), ultraviolet absorber (UV234), zirconium phosphate and antioxidant (antioxidant 1010: antioxidant 168 = 1:1) into a mixer (500 r / min) and mix for 5 min at room temperature.

[0083] Step 3: Add the mixed material from Step 2 into the hopper of a parallel twin-screw extruder. After melt extrusion, cooling, air drying, and pelletizing, the process parameters are as follows: Zone 1 temperature 160℃, Zone 2 temperature 250℃, Zone 3 temperature 250℃, Zone 4 temperature 250℃, Zone 5 temperature 250℃, Zone 6 temperature 230℃, Zone 7 temperature 230℃, Zone 8 temperature 230℃, die temperature 250℃, and screw speed 500 rpm. The properties of this composite material are shown in Table 2.

[0084] Comparative Example 1:

[0085] The PBT resin used in this comparative example is a medium-viscosity resin with an intrinsic viscosity of 1.05±0.02 dL / g, and the other raw materials are the same as those in the example.

[0086] This comparative example describes a scratch-resistant and weather-resistant PBT composite material, prepared from the following raw materials in parts by weight:

[0087]

[0088] The preparation method of the above-mentioned PBT composite material includes the following steps:

[0089] Step 1: Dry the PBT resin at 140℃ for 4 hours. After drying, cool it to room temperature. Put the titanium dioxide and coupling agent into a high-speed mixer (1000r / min) and mix them at room temperature for 30 minutes.

[0090] Step 2: Place the PBT resin, titanium dioxide, coupling agent (γ-aminopropyltrimethoxysilane), ultraviolet absorber (UV234), zirconium phosphate and antioxidant (antioxidant 1010: antioxidant 168 = 1:1) into a mixer (500 r / min) and mix for 5 min at room temperature.

[0091] Step 3: Add the mixed material from Step 2 into the hopper of a parallel twin-screw extruder. After melt extrusion, cooling, air drying, and pelletizing, the process parameters are as follows: Zone 1 temperature 160℃, Zone 2 temperature 250℃, Zone 3 temperature 250℃, Zone 4 temperature 250℃, Zone 5 temperature 250℃, Zone 6 temperature 230℃, Zone 7 temperature 230℃, Zone 8 temperature 230℃, die temperature 250℃, and screw speed 500 rpm. The properties of this composite material are shown in Table 2.

[0092] Comparative Example 2:

[0093] The raw materials used in this comparative example are the same as those used in the example.

[0094] This comparative example describes a scratch-resistant and weather-resistant PBT composite material, prepared from the following raw materials in parts by weight:

[0095]

[0096] The preparation method of the above-mentioned PBT composite material includes the following steps:

[0097] Step 1: Dry the PBT resin at 140°C for 4 hours. After drying, cool it to room temperature.

[0098] Step 2: Place the PBT resin, titanium dioxide, coupling agent (γ-aminopropyltrimethoxysilane), ultraviolet absorber (UV234), zirconium phosphate and antioxidant (antioxidant 1010: antioxidant 168 = 1:1) into a mixer (500 r / min) and mix for 5 min at room temperature.

[0099] Step 3: Add the mixed material from Step 2 into the hopper of a parallel twin-screw extruder. After melt extrusion, cooling, air drying, and pelletizing, the process parameters are as follows: Zone 1 temperature 160℃, Zone 2 temperature 250℃, Zone 3 temperature 250℃, Zone 4 temperature 250℃, Zone 5 temperature 250℃, Zone 6 temperature 230℃, Zone 7 temperature 230℃, Zone 8 temperature 230℃, die temperature 250℃, and screw speed 500 rpm. The properties of this composite material are shown in Table 2.

[0100] Comparative Example 3:

[0101] The raw materials used in this comparative example are the same as those used in the example.

[0102] This comparative example describes a scratch-resistant and weather-resistant PBT composite material, prepared from the following raw materials in parts by weight:

[0103]

[0104] The preparation method of the above-mentioned PBT composite material includes the following steps:

[0105] Step 1: Dry the PBT resin at 140°C for 4 hours. After drying, cool it to room temperature.

[0106] Step 2: Place the PBT resin, coupling agent (γ-aminopropyltrimethoxysilane), ultraviolet absorber (UV234), zirconium phosphate and antioxidant (1010:168 = 1:1) into a mixer (500 r / min) and mix for 5 min at room temperature;

[0107] Step 3: Add the mixed material from Step 2 into the hopper of a parallel twin-screw extruder. After melt extrusion, cooling, air drying, and pelletizing, the process parameters are as follows: Zone 1 temperature 160℃, Zone 2 temperature 250℃, Zone 3 temperature 250℃, Zone 4 temperature 250℃, Zone 5 temperature 250℃, Zone 6 temperature 230℃, Zone 7 temperature 230℃, Zone 8 temperature 230℃, die temperature 250℃, and screw speed 500 rpm. The properties of this composite material are shown in Table 2.

[0108] Comparative Example 4:

[0109] The raw materials used in this comparative example are the same as those used in the example.

[0110] This comparative example describes a scratch-resistant and weather-resistant PBT composite material, prepared from the following raw materials in parts by weight:

[0111]

[0112]

[0113] The preparation method of the above-mentioned PBT composite material includes the following steps:

[0114] Step 1: Dry the PBT resin at 140°C for 4 hours. After drying, cool it to room temperature.

[0115] Step 2: Place the PBT resin, titanium dioxide, ultraviolet absorber (UV234), zirconium phosphate and antioxidant (1010:168 = 1:1) into a mixer (500 r / min) and mix for 5 min at room temperature;

[0116] Step 3: Add the mixed material from Step 2 into the hopper of a parallel twin-screw extruder. After melt extrusion, cooling, air drying, and pelletizing, the process parameters are as follows: Zone 1 temperature 160℃, Zone 2 temperature 250℃, Zone 3 temperature 250℃, Zone 4 temperature 250℃, Zone 5 temperature 250℃, Zone 6 temperature 230℃, Zone 7 temperature 230℃, Zone 8 temperature 230℃, die temperature 250℃, and screw speed 500 rpm. The properties of this composite material are shown in Table 2.

[0117] Comparative Example 5:

[0118] The raw materials used in this comparative example are the same as those used in the example.

[0119] This comparative example describes a scratch-resistant and weather-resistant PBT composite material, prepared from the following raw materials in parts by weight:

[0120]

[0121]

[0122] The preparation method of the above-mentioned PBT composite material includes the following steps:

[0123] Step 1: Dry the PBT resin at 140℃ for 4 hours. After drying, cool it to room temperature. Put the titanium dioxide and coupling agent into a high-speed mixer (1000r / min) and mix them at room temperature for 30 minutes.

[0124] Step 2: Place the PBT resin, titanium dioxide, coupling agent (γ-aminopropyltrimethoxysilane), zirconium phosphate and antioxidant (antioxidant 1010: antioxidant 168 = 1:1) into a mixer (500 r / min) and mix for 5 min at room temperature;

[0125] Step 3: Add the mixed material from Step 2 into the hopper of a parallel twin-screw extruder. After melt extrusion, cooling, air drying, and pelletizing, the process parameters are as follows: Zone 1 temperature 160℃, Zone 2 temperature 250℃, Zone 3 temperature 250℃, Zone 4 temperature 250℃, Zone 5 temperature 250℃, Zone 6 temperature 230℃, Zone 7 temperature 230℃, Zone 8 temperature 230℃, die temperature 250℃, and screw speed 500 rpm. The properties of this composite material are shown in Table 2.

[0126] Comparative Example 6:

[0127] The raw materials used in this comparative example are the same as those used in the example.

[0128] This comparative example describes a scratch-resistant and weather-resistant PBT composite material, prepared from the following raw materials in parts by weight:

[0129]

[0130] The preparation method of the above-mentioned PBT composite material includes the following steps:

[0131] Step 1: Dry the PBT resin at 140℃ for 4 hours. After drying, cool it to room temperature. Put the titanium dioxide and coupling agent into a high-speed mixer (1000r / min) and mix them at room temperature for 30 minutes.

[0132] Step 2: Place the PBT resin, titanium dioxide, coupling agent (γ-aminopropyltrimethoxysilane), ultraviolet absorber (UV234), and antioxidant (antioxidant 1010: antioxidant 168 = 1:1) into a mixer (500 r / min) and mix for 5 min at room temperature.

[0133] Step 3: Add the mixed material from Step 2 into the hopper of a parallel twin-screw extruder. After melt extrusion, cooling, air drying, and pelletizing, the process parameters are as follows: Zone 1 temperature 160℃, Zone 2 temperature 250℃, Zone 3 temperature 250℃, Zone 4 temperature 250℃, Zone 5 temperature 250℃, Zone 6 temperature 230℃, Zone 7 temperature 230℃, Zone 8 temperature 230℃, die temperature 250℃, and screw speed 500 rpm. The properties of this composite material are shown in Table 2.

[0134] The following is a summary table of the embodiments and comparative examples (Table 1):

[0135] Table 1. Summary of Raw Material Composition (by Weight) for Examples and Comparative Examples

[0136]

[0137]

[0138] The plastic parts samples prepared in the above embodiments and comparative examples were subjected to the following performance tests (the results are shown in Table 2):

[0139] Tensile properties: Tested according to GB / T 1040.1-2006 standard, tensile rate 50 mm / min;

[0140] Impact performance: Tested according to GB / T 1843-2008 standard;

[0141] Scratch resistance: The scratch resistance of the material is evaluated by comparing the color difference (△E) of the material before and after scratching using the cross-scratch method.

[0142] Weather resistance: Tested according to GB / T 16422.3-1997 standard (exposure conditions: 1. radiation temperature 50℃, irradiation time 5h, irradiation intensity 0.8W / m²). 2 2. Spray water at 20℃ for 1 hour; 3. Aging for 200 hours) The weather resistance of the material is evaluated by comparing the color difference (△E) before and after aging.

[0143] Texture: The appearance and feel of the sample were compared and evaluated by visual inspection. Five observers observed the sample in the same environment and gave scores (0.0-12.0 points). The average score of the five observers was taken. The appearance rating was from best to worst, in the following order: glossy (10.0-12.0 points), very good (8.0-9.9 points), excellent (6.0-7.9 points), good (4.0-5.9 points), average (2.0-3.9 points), and poor (0-1.9 points).

[0144] Table 2. Performance Overview of Examples and Comparative Examples

[0145]

[0146]

[0147] As can be seen from Examples 1-6, the higher the amount of titanium dioxide added, the better the weather resistance of the PBT composite material. However, since inorganic fillers tend to agglomerate in organic resins, increasing the amount of titanium dioxide added leads to a deterioration in the appearance of the composite material. The higher the amount of coupling agent added, the better the appearance of the composite material. Increasing the amount of UV absorber added improves the weather resistance of the composite material. Increasing the amount of zirconium phosphate significantly improves the scratch resistance of the material and effectively improves the appearance of the composite material. Considering all these factors, Example 6 exhibits the best overall performance.

[0148] Compared with Example 6, Comparative Example 1 used a medium-viscosity PBT resin with higher viscosity, resulting in poorer flowability and affecting the dispersion of titanium dioxide in the resin matrix, leading to a deterioration in the appearance of the composite material. In Comparative Example 2, the resin and coupling agent were not subjected to high-mixing treatment, resulting in insufficient interfacial bonding between the resin and coupling agent, failing to maximize the affinity effect of the coupling agent and affecting the dispersion of the filler. In Comparative Example 3, compared with Example 6, no titanium dioxide was added, resulting in a significant reduction in the weather resistance of the composite material, a significant decrease in density, and a significant deterioration in the material's texture. In Comparative Example 4, compared with Example 6, no coupling agent was added, resulting in a significant decrease in the bonding strength between the organic resin and the inorganic filler, weakening the dispersion ability of titanium dioxide in the resin matrix, and making the titanium dioxide prone to agglomeration. Polymerization leads to poor appearance; compared with Example 6, Comparative Example 5 did not add a UV absorber, and the resin absorbed a large amount of UV light and underwent oxidative degradation, resulting in material discoloration; compared with Example 6, Comparative Example 6 did not add zirconium phosphate, and the surface lubricity of the composite material decreased significantly, and the bonding ability between the resin and the inorganic filler decreased, resulting in a significant reduction in the material's scratch resistance and texture; through comparison, it can be found that the addition of titanium dioxide, coupling agent, zirconium phosphate, and UV absorber has no significant effect on the rigidity and toughness of the composite material; using the scheme described in Example 6, the PBT composite material prepared by it has significantly improved scratch resistance, weather resistance, and texture, achieving the beneficial effect of obtaining a PBT composite material with superior scratch resistance, excellent weather resistance, and good texture characteristics.

[0149] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0150] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A scratch-resistant and weather-resistant PBT composite material, characterized in that, The PBT composite material is used to prepare bathroom products and includes the following raw materials in parts by weight: 70-90 parts of PBT resin; 10-30 parts titanium dioxide; 5 parts coupling agent; 7-10 parts of zirconium phosphate; 0.4–0.5 parts of ultraviolet absorber; The intrinsic viscosity of the PBT resin is 0.65 to 0.95 dL / g; the total weight of the PBT resin and titanium dioxide is 100 parts. The coupling agent is a silane-type coupling agent; The zirconium phosphate is α-zirconium phosphate; The preparation method of the scratch-resistant and weather-resistant PBT composite material includes the following steps: Take PBT resin and dry it; mix 10-30 parts by weight of titanium dioxide with 5 parts by weight of coupling agent. Then add 70-90 parts by weight of the PBT resin and 7-10 parts by weight of zirconium phosphate and stir to mix. The above mixture is melt-extruded to obtain the scratch-resistant and weather-resistant PBT composite material.

2. The scratch-resistant and weather-resistant PBT composite material according to claim 1, characterized in that, It also includes 0.1 to 0.3 parts by weight of antioxidants.

3. The scratch-resistant and weather-resistant PBT composite material according to claim 1, characterized in that, The titanium dioxide is rutile titanium dioxide with a mesh size of 8000-1000 mesh.

4. The scratch-resistant and weather-resistant PBT composite material according to claim 1, characterized in that, The ultraviolet absorber is at least one of salicylates, benzophenones, benzotriazoles, substituted acrylonitriles, and triazine ultraviolet absorbers.

5. The scratch-resistant and weather-resistant PBT composite material according to claim 2, characterized in that, The antioxidant is at least one of hindered phenolic antioxidants, hindered amine antioxidants, phosphate ester antioxidants, and thioester antioxidants.

6. The scratch-resistant and weather-resistant PBT composite material according to claim 1, characterized in that, The extruder process parameters for the melt extrusion are as follows: zone 1 temperature is 160-180℃, zone 2 temperature is 240-260℃, zone 3 temperature is 240-260℃, zone 4 temperature is 240-260℃, zone 5 temperature is 240-260℃, zone 6 temperature is 220-240℃, zone 7 temperature is 220-240℃, zone 8 temperature is 220-240℃, die temperature is 240-260℃, and screw speed is 300-500 rpm.

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