PVC / SAN alloy material and preparation method and application thereof

Abstract

The invention specifically discloses a PVC / SAN alloy material as well as a preparation method and application thereof, and belongs to the field of application of transparent flame-retardant materials. The PVC / SAN alloy material provided by the invention comprises the following components in parts by weight: 80-120 parts of polyvinyl chloride resin; 10 to 50 parts of SAN resin; 0.1 to 0.5 part of benzotriazole; 2-5 parts of a heat stabilizer; the content of AN in the SAN resin is 15-30%, and the polymerization degree of the polyvinyl chloride resin is 300-750. The invention fills the technical blank in the field of transparent PVC / SAN alloy materials, and provides the PVC / SAN alloy material which can meet high transparency and high weather resistance at the same time.

Description

Technical Field

[0001] The present invention belongs to the field of applications of transparent flame-retardant materials, and particularly relates to a PVC / SAN alloy material, a preparation method thereof, and an application thereof. Background Art

[0002] PVC alloy materials are composite materials mainly made of polyvinyl chloride (PVC) as the main raw material, and are prepared by physical blending or chemical grafting methods, adding auxiliary materials such as plasticizers, stabilizers, and fillers, and through processes such as mixing, hot melt blending, extrusion, and surface treatment.

[0003] PVC alloy materials have advantages such as good corrosion resistance, wear resistance, fire resistance, and insulation. At the same time, PVC alloy materials have high hardness and good impact resistance, can inhibit deformation at high temperatures, and improve the impact strength during cutting. PVC alloy materials are easy to process, can be made into products of various shapes and sizes according to needs, and have excellent weather resistance, and can usually be used outdoors without coating.

[0004] PVC alloy products are widely used in fields such as automobiles, electronics, precision instruments, office equipment, packaging materials, and building materials. In the automotive industry, PVC alloy materials are used in instrument panels, wheel covers, air supply fans, battery packs, rear exhaust grilles, etc., as well as external automotive parts such as radiator grilles, lamp housings, rearview mirrors, and rear windows. In addition, in the construction field, PVC alloys are mainly used to make interior and exterior decorative panels such as window frames, partitions, suspended ceilings, and wall panels; in furniture manufacturing, they are also widely used to make furniture such as cabinets, dining tables, and bookcases; in the field of electronic appliances, PVC alloys are used in products such as mobile phone cases, keyboards, and game handles.

[0005] Although PVC alloy materials have the above-mentioned many advantages and uses, pure PVC cannot meet the above requirements, and additives need to be added to PVC to improve its physical properties. Adding various additives to transparent PVC alloy materials easily causes a decrease in the transparency of the PVC material. At present, there are very few improvements to transparent PVC alloy materials, and the prior art fails to provide a PVC / SAN alloy material that can simultaneously meet high weather resistance and high transparency. Summary of the Invention

[0006] The purpose of the present invention is to overcome the above technical defects and provide a PVC / SAN alloy material that can meet high transparency and high weather resistance.

[0007] The present invention is achieved through the following technical solutions: A PVC / SAN alloy material, by weight, comprises the following components: 80 - 120 parts of polyvinyl chloride resin; 10 - 50 parts of SAN resin; 2-(2'-Hydroxy-5'-methylphenyl) benzotriazole: 0.1 - 0.5 parts; Heat stabilizer: 2 - 5 parts; The AN content in the SAN resin is 15 - 30 wt%; The degree of polymerization of the polyvinyl chloride resin is 300 - 750.

[0008] In the present invention, the determination method of the AN content in the SAN resin is quantitative testing by Fourier transform infrared spectroscopy (FTIR).

[0009] In the present invention, the determination standard of the degree of polymerization of the polyvinyl chloride resin is GB / T 13662 - 2009, and the detection method is gel chromatography.

[0010] The minimum mass percentage of the polyvinyl chloride resin in the PVC / SAN alloy material is 60%.

[0011] In the PVC / SAN alloy material of the present invention, the content of the polyvinyl chloride resin is: 80 parts, 81 parts, 82 parts, 83 parts, 84 parts, 85 parts, 90 parts, 95 parts, 100 parts, 110 parts, 115 parts, 120 parts, etc.

[0012] In the PVC / SAN alloy material of the present invention, the degree of polymerization of the polyvinyl chloride resin is: 300, 325, 350, 375, 400, 425, 450, 475, 500, 525, 550, 575, 600, 625, 650, 675, 700, 725, 750, etc.

[0013] In the PVC / SAN alloy material of the present invention, the content of the SAN resin is: 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, etc.

[0014] In the PVC / SAN alloy material of the present invention, the AN content in the SAN resin is 15 wt%, 16 wt%, 17 wt%, 18 wt%, 19 wt%, 20 wt%, 21 wt%, 22 wt%, 23 wt%, 24 wt%, 25 wt%, 26 wt%, 27 wt%, 28 wt%, 29 wt%, 30 wt%, etc.

[0015] In the PVC / SAN alloy material of the present invention, the content of 2-(2'-hydroxy-5'-methylphenyl) benzotriazole is: 0.1 part, 0.2 part, 0.3 part, 0.4 part, 0.5 part, etc.

[0016] Preferably, the polyvinyl chloride resin is rigid polyvinyl chloride, and the degree of polymerization of the polyvinyl chloride resin is 600 - 650.

[0017] Preferably, the AN content in the SAN resin is 20-25 wt%.

[0018] Preferably, the heat stabilizer is selected from at least one of organotin stabilizers and calcium-zinc stabilizers.

[0019] The heat stabilizer is further preferably an organotin stabilizer.

[0020] Specifically, the organotin stabilizer is selected from mercaptomethyltin.

[0021] Those skilled in the art can add according to actual needs, by weight: 3-8 parts of toughening agent; 1-3 parts of lubricant.

[0022] Preferably, the toughening agent is selected from any one or more of MBS toughening agents, CPE toughening agents or ACR toughening agents.

[0023] The toughening agent is further preferably an MBS toughening agent.

[0024] Preferably, the lubricant is selected from any one or more of polyethylene wax, ester lubricants, stearic acid lubricants, amide lubricants or EBS lubricants.

[0025] The present invention provides a method for preparing the above PVC / SAN alloy material, comprising the following steps: weighing PVC resin, heat stabilizer, and lubricant and adding them to a high-speed mixer, heating and mixing to 90-110 °C; adding SAN resin and toughening agent, mixing for 1-5 min and then discharging the mixed powder in the high-speed mixer into a low-speed mixer, cooling to 80 °C and then discharging the mixed powder into an extruder screw for pelletizing to obtain the PVC / SAN alloy material.

[0026] The present invention provides the application of the above PVC / SAN alloy material for manufacturing transparent components in the fields of building materials and sanitary wares, and household appliances.

[0027] The present invention has the following beneficial effects: On the premise of maintaining the transparent characteristics of the PVC material, the present invention selects SAN resin with a specific number of parts and a specific AN content to form a PVC / SAN alloy material with PVC resin. The SAN resin can improve the heat distortion temperature of the PVC / SAN resin. At the same time, the PVC / SAN alloy material provided by the present invention has high weather resistance under the condition of high transparency. The component formula provided by the present invention fills the blank in the field of transparent PVC alloy materials and further enriches the scenarios of PVC alloy materials. Detailed implementation manners

[0028] The present invention will be described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made. These all fall within the protection scope of the present invention.

[0029] Sources of raw materials used in the present invention: PVC Resin - 1: PVC S - 50, with a degree of polymerization of 350 - 400, Formosa Plastics.

[0030] PVC Resin - 2: PVC powder S400, with a degree of polymerization of 450 - 500, Kaneka of Japan.

[0031] PVC Resin - 3: PVC B - 57, with a degree of polymerization of 600 - 650, Formosa Plastics.

[0032] PVC Resin - 4: PVC DG - 800, with a degree of polymerization of 800 - 850, Dagu.

[0033] SAN Resin - 1: SAN 310 NR TR, with an AN content of 18 wt%, Kumho.

[0034] SAN Resin - 2: DG - AS106, with an AN content of 20 wt%, Tianjin Dagu.

[0035] SAN Resin - 3: SAN - 327, with an AN content of 23 wt%, Daqing Petrochemical.

[0036] SAN Resin - 4: SAN - 355, with an AN content of 25 wt%, Daqing Petrochemical.

[0037] SAN Resin - 5: SAN - 10, with an AN content of 10 wt%, Kingfa.

[0038] SAN Resin - 6: SAN - 37, with an AN content of 37 wt%, Kingfa.

[0039] 2-(2'-Hydroxy-5'-methylphenyl)benzotriazole: RIASORB UV - P, Rianlon.

[0040] 2-(2’-Hydroxy-3’,5’-di-tert-butylphenyl)benzotriazole: RIASORB UV - 234, Rianlon.

[0041] 2-Hydroxy-4-methoxybenzophenone: UV - 9, Nanjing Milan Chemical Industry.

[0042] Mercaptomethyltin: Organotin stabilizer, SW - 977 mercaptomethyltin, Hubei Benxing.

[0043] Calcium-zinc stabilizer: DA-90391, Dongguan Zhenzhong.

[0044] MBS toughening agent: BTA717, Dow Chemical.

[0045] CPE toughening agent: CPE-132C, Hangzhou Keli.

[0046] ACR toughening agent: KM-355P, Dow Chemical.

[0047] Polyethylene wax: 617A, Honeywell.

[0048] Preparation method of PVC / SAN alloy materials for examples and comparative examples: Weigh PVC resin, heat stabilizer, and lubricant and add them to a high-speed mixer. Heat and mix to 100 °C; add SAN resin and toughening agent, and after mixing for 5 minutes, discharge the mixed powder in the high-speed mixer into a low-speed mixer. After cooling to 80 °C, discharge the mixed powder into the extruder screw for granulation to obtain PVC / SAN alloy materials.

[0049] Test methods for each item: (1) HDT test standard: ASTM D1525, condition 0.45 MPa.

[0050] (2) Transparency test: Color plate injection molding process, temperature 175 °C, speed and pressure are 50% and 65% respectively, mold temperature ≤ 50 °C, color plate size: 80*40*1 mm, the front side of the color plate is smooth, the back side is textured, and the light transmittance and haze are tested.

[0051] (3) Weather resistance color difference: The color difference of the sample is detected using the ISO 4892 standard. The PVC composition is treated with a daylight filter, 102 minutes of light irradiation + 18 minutes of spraying, irradiance is (0.51 ± 0.02) W / (m2*nm) @ 340 nm, black standard temperature is (65 ± 3) °C, chamber temperature is (38 ± 3) °C, relative humidity is (50 ± 10)%, test for 1000 h, and then color difference detection is carried out.

[0052] Table 1: Weight part content and test results of each component of PVC / SAN alloy materials in Examples 1-9 Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 PVC Resin - 1 100 100 100 100 PVC Resin - 2 100 PVC Resin - 3 100 100 80 120 SAN Resin - 1 20 20 20 20 SAN Resin - 2 20 SAN Resin - 3 20 50 10 SAN Resin - 4 20 2-(2'-Hydroxy-5'-methylphenyl)benzotriazole 0.3 0.3 0.3 0.3 0.1 0.5 0.3 0.3 0.3 Mercaptomethyltin 3 3 3 3 5 2 3 3 Calcium-Zinc Stabilizer 3 MBS Toughening Agent 5 5 5 5 3 5 5 CPE Toughening Agent 5 ACR Toughening Agent 5 Polyethylene Wax 2 2 2 2 1 3 2 2 2 HDT, °C (0.45 Mpa) 74 74 75 74 74 73 72 71 71 Light Transmittance, % 83% 85% 88% 86% 82% 80% 81% 80% 82% Haze 15% 13% 8% 10% 12% 14% 18% 20% 19% Weather Resistance Color Difference 3.1 3.3 2.8 3.0 3.5 3.0 3.5 3.6 3.8 It can be seen from Examples 1-9 that the light transmittance of the PVC / SAN alloy materials provided by the present invention all reaches more than 80%, the haze is all less than 20%, and the weather resistance color difference is all lower than 4.0, belonging to PVC / SAN alloy materials with high transparency, low haze, and high weather resistance.

[0053] Table 2: Weight part content and test results of each component of PVC / SAN alloy materials in Comparative Examples 1-5 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 PVC Resin - 1 100 100 100 100 PVC Resin - 4 100 SAN Resin - 1 20 20 20 SAN Resin - 5 20 SAN Resin - 6 20 2-(2'-Hydroxy-5'-methylphenyl)benzotriazole 0.3 0.3 0.3 2-(2’-Hydroxy-3’, 5’-di-tert-butylphenyl)benzotriazole 0.3 2-Hydroxy-4-methoxybenzophenone 0.3 Mercaptomethyltin 3 3 3 3 3 MBS Toughening Agent 5 5 5 5 5 Polyethylene Wax 2 2 2 2 2 HDT, °C (0.45 Mpa) 67 65 68 68 66 Light Transmittance, % 50% 55% 58% 60% 58% Haze 50% 48% 48% 39% 40% Weather Resistance Color Difference 4.1 4.5 4.3 4.2 4.3 The AN content of the SAN resin selected in Comparative Example 1-2 did not fall within the range of 15-30 wt%.

[0054] The degree of polymerization of the PVC resin selected in Comparative Example 3 did not fall within the range of 300-750.

[0055] In Comparative Examples 4-5, 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)benzotriazole and 2-hydroxy-4-methoxybenzophenone were used to replace 2-(2'-hydroxy-5'-methylphenyl)benzotriazole as raw materials. The light transmittance of the prepared PVC / SAN alloy material was less than 80%, the haze was greater than 20%, and the weathering color difference compared with the examples increased, indicating a decrease in weather resistance.

Claims

1. A PVC / SAN alloy material, characterized in that: By weight, it includes the following components: 80-120 parts of polyvinyl chloride resin; SAN resin 10-50 parts; 2-(2'-hydroxy-5'-methylphenyl)benzotriazole 0.1-0.5 part; 2-5 parts of heat stabilizer; The AN content in the SAN resin is 15-30wt%; The polymerization degree of the polyvinyl chloride resin is 300-750.

2. A PVC / SAN alloy material according to claim 1, characterized in that: The polyvinyl chloride resin is rigid polyvinyl chloride, and the polymerization degree of the polyvinyl chloride resin is 600-650.

3. A PVC / SAN alloy material according to claim 1, characterized in that: The AN content in the SAN resin is 20-25wt%.

4. The PVC / SAN alloy material according to claim 1, characterized in that: The heat stabilizer is selected from at least one of an organic tin stabilizer and a calcium zinc stabilizer; an organic tin stabilizer is preferred.

5. A PVC / SAN alloy material according to claim 4, characterized in that: The organotin stabilizer is selected from methyltin mercaptan.

6. The PVC / SAN alloy material according to claim 1, characterized in that: The invention also includes the following components by weight: 3-8 parts of toughening agent and 1-3 parts of lubricant.

7. A PVC / SAN alloy material according to claim 6, characterized in that: The toughening agent is selected from any one or more of MBS toughening agents, CPE toughening agents or ACR toughening agents, preferably MBS toughening agents.

8. The PVC / SAN alloy material according to claim 6, characterized in that: The lubricant is selected from any one or more of polyethylene wax, ester lubricant, stearic acid lubricant, amide lubricant or EBS lubricant.

9. The method for preparing the PVC / SAN alloy material according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: weighing PVC resin, a heat stabilizer and a lubricant, adding them into a high-speed mixer, and heating and mixing them to 90-110° C.; adding SAN resin and a toughening agent, mixing for 1-5 minutes, discharging the mixed powder in the high-speed mixer into a low-speed mixer, cooling the mixed powder to 80° C., feeding the mixed powder into an extruder screw for granulation, and obtaining a PVC / SAN alloy material.

10. The use of the PVC / SAN alloy material according to any one of claims 1 to 8, characterized in that: Used to manufacture transparent parts in the fields of building materials, sanitary ware and household appliances.